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Diff for /loncom/lond between versions 1.177 and 1.411

version 1.177, 2004/02/18 10:35:56 version 1.411, 2009/02/10 11:31:26
Line 20 Line 20
 #  #
 # You should have received a copy of the GNU General Public License  # You should have received a copy of the GNU General Public License
 # along with LON-CAPA; if not, write to the Free Software  # along with LON-CAPA; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA      # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #  #
 # /home/httpd/html/adm/gpl.txt  # /home/httpd/html/adm/gpl.txt
 #  #
Line 31 Line 31
   
 use strict;  use strict;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
   use LONCAPA;
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
   
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
 #use Apache::File;  #use Apache::File;
 use Symbol;  
 use POSIX;  use POSIX;
 use Crypt::IDEA;  use Crypt::IDEA;
 use LWP::UserAgent();  use LWP::UserAgent();
   use Digest::MD5 qw(md5_hex);
 use GDBM_File;  use GDBM_File;
 use Authen::Krb4;  use Authen::Krb4;
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  
 use localauth;  use localauth;
   use localenroll;
   use localstudentphoto;
 use File::Copy;  use File::Copy;
 use LONCAPA::ConfigFileEdit;  use File::Find;
   use LONCAPA::lonlocal;
   use LONCAPA::lonssl;
   use Fcntl qw(:flock);
   use Apache::lonnet;
   
 my $DEBUG = 0;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
Line 55  my $lastlog=''; Line 61  my $lastlog='';
   
 my $VERSION='$Revision$'; #' stupid emacs  my $VERSION='$Revision$'; #' stupid emacs
 my $remoteVERSION;  my $remoteVERSION;
 my $currenthostid;  my $currenthostid="default";
 my $currentdomainid;  my $currentdomainid;
   
 my $client;  my $client;
 my $clientip;  my $clientip; # IP address of client.
 my $clientname;  my $clientname; # LonCAPA name of client.
   
 my $cipher; # Cipher key negotiated with client.  
 my $tmpsnum = 0;; # Id of tmpputs.  
   
 my $server;  my $server;
 my $thisserver;  
   my $keymode;
   
   my $cipher; # Cipher key negotiated with client
   my $tmpsnum = 0; # Id of tmpputs.
   
 #   # 
 #   Connection type is:  #   Connection type is:
Line 77  my $thisserver; Line 84  my $thisserver;
   
 my $ConnectionType;  my $ConnectionType;
   
 my %hostid;  
 my %hostdom;  
 my %hostip;  
   
 my %managers; # Ip -> manager names  my %managers; # Ip -> manager names
   
 my %perlvar; # Will have the apache conf defined perl vars.  my %perlvar; # Will have the apache conf defined perl vars.
Line 98  my $CLIENT_OK  = 1; Line 101  my $CLIENT_OK  = 1;
 my $MANAGER_OK = 2;  my $MANAGER_OK = 2;
 my %Dispatcher;  my %Dispatcher;
   
   
 #  #
 #  The array below are password error strings."  #  The array below are password error strings."
 #  #
 my $lastpwderror    = 13; # Largest error number from lcpasswd.  my $lastpwderror    = 13; # Largest error number from lcpasswd.
 my @passwderrors = ("ok",  my @passwderrors = ("ok",
    "lcpasswd must be run as user 'www'",     "pwchange_failure - lcpasswd must be run as user 'www'",
    "lcpasswd got incorrect number of arguments",     "pwchange_failure - lcpasswd got incorrect number of arguments",
    "lcpasswd did not get the right nubmer of input text lines",     "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
    "lcpasswd too many simultaneous pwd changes in progress",     "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
    "lcpasswd User does not exist.",     "pwchange_failure - lcpasswd User does not exist.",
    "lcpasswd Incorrect current passwd",     "pwchange_failure - lcpasswd Incorrect current passwd",
    "lcpasswd Unable to su to root.",     "pwchange_failure - lcpasswd Unable to su to root.",
    "lcpasswd Cannot set new passwd.",     "pwchange_failure - lcpasswd Cannot set new passwd.",
    "lcpasswd Username has invalid characters",     "pwchange_failure - lcpasswd Username has invalid characters",
    "lcpasswd Invalid characters in password",     "pwchange_failure - lcpasswd Invalid characters in password",
     "11", "12",     "pwchange_failure - lcpasswd User already exists", 
     "lcpasswd Password mismatch");                     "pwchange_failure - lcpasswd Something went wrong with user addition.",
      "pwchange_failure - lcpasswd Password mismatch",
      "pwchange_failure - lcpasswd Error filename is invalid");
   
   
 #  The array below are lcuseradd error strings.:  #  The array below are lcuseradd error strings.:
Line 129  my @adderrors    = ("ok", Line 135  my @adderrors    = ("ok",
     "lcuseradd Unable to make www member of users's group",      "lcuseradd Unable to make www member of users's group",
     "lcuseradd Unable to su to root",      "lcuseradd Unable to su to root",
     "lcuseradd Unable to set password",      "lcuseradd Unable to set password",
     "lcuseradd Usrname has invalid characters",      "lcuseradd Username has invalid characters",
     "lcuseradd Password has an invalid character",      "lcuseradd Password has an invalid character",
     "lcuseradd User already exists",      "lcuseradd User already exists",
     "lcuseradd Could not add user.",      "lcuseradd Could not add user.",
     "lcuseradd Password mismatch");      "lcuseradd Password mismatch");
   
   
   
 #  #
 #   Statistics that are maintained and dislayed in the status line.  #   Statistics that are maintained and dislayed in the status line.
 #  #
 my $Transactions; # Number of attempted transactions.  my $Transactions = 0; # Number of attempted transactions.
 my $Failures; # Number of transcations failed.  my $Failures     = 0; # Number of transcations failed.
   
 #   ResetStatistics:   #   ResetStatistics: 
 #      Resets the statistics counters:  #      Resets the statistics counters:
Line 149  sub ResetStatistics { Line 157  sub ResetStatistics {
     $Failures     = 0;      $Failures     = 0;
 }  }
   
   #------------------------------------------------------------------------
   #
   #   LocalConnection
   #     Completes the formation of a locally authenticated connection.
   #     This function will ensure that the 'remote' client is really the
   #     local host.  If not, the connection is closed, and the function fails.
   #     If so, initcmd is parsed for the name of a file containing the
   #     IDEA session key.  The fie is opened, read, deleted and the session
   #     key returned to the caller.
   #
   # Parameters:
   #   $Socket      - Socket open on client.
   #   $initcmd     - The full text of the init command.
   #
   # Returns:
   #     IDEA session key on success.
   #     undef on failure.
   #
   sub LocalConnection {
       my ($Socket, $initcmd) = @_;
       Debug("Attempting local connection: $initcmd client: $clientip");
       if($clientip ne "127.0.0.1") {
    &logthis('<font color="red"> LocalConnection rejecting non local: '
    ."$clientip ne 127.0.0.1 </font>");
    close $Socket;
    return undef;
       }  else {
    chomp($initcmd); # Get rid of \n in filename.
    my ($init, $type, $name) = split(/:/, $initcmd);
    Debug(" Init command: $init $type $name ");
   
    # Require that $init = init, and $type = local:  Otherwise
    # the caller is insane:
   
    if(($init ne "init") && ($type ne "local")) {
       &logthis('<font color = "red"> LocalConnection: caller is insane! '
        ."init = $init, and type = $type </font>");
       close($Socket);;
       return undef;
   
    }
    #  Now get the key filename:
   
    my $IDEAKey = lonlocal::ReadKeyFile($name);
    return $IDEAKey;
       }
   }
   #------------------------------------------------------------------------------
   #
   #  SSLConnection
   #   Completes the formation of an ssh authenticated connection. The
   #   socket is promoted to an ssl socket.  If this promotion and the associated
   #   certificate exchange are successful, the IDEA key is generated and sent
   #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
   #   the caller after the SSL tunnel is torn down.
   #
   # Parameters:
   #   Name              Type             Purpose
   #   $Socket          IO::Socket::INET  Plaintext socket.
   #
   # Returns:
   #    IDEA key on success.
   #    undef on failure.
   #
   sub SSLConnection {
       my $Socket   = shift;
   
       Debug("SSLConnection: ");
       my $KeyFile         = lonssl::KeyFile();
       if(!$KeyFile) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get key file $err </font>");
    return undef;
       }
       my ($CACertificate,
    $Certificate) = lonssl::CertificateFile();
   
   
       # If any of the key, certificate or certificate authority 
       # certificate filenames are not defined, this can't work.
   
       if((!$Certificate) || (!$CACertificate)) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get certificates: $err </font>");
   
    return undef;
       }
       Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
   
       # Indicate to our peer that we can procede with
       # a transition to ssl authentication:
   
       print $Socket "ok:ssl\n";
   
       Debug("Approving promotion -> ssl");
       #  And do so:
   
       my $SSLSocket = lonssl::PromoteServerSocket($Socket,
    $CACertificate,
    $Certificate,
    $KeyFile);
       if(! ($SSLSocket) ) { # SSL socket promotion failed.
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL "
    ."SSL Socket promotion failed: $err </font>");
    return undef;
       }
       Debug("SSL Promotion successful");
   
       # 
       #  The only thing we'll use the socket for is to send the IDEA key
       #  to the peer:
   
       my $Key = lonlocal::CreateCipherKey();
       print $SSLSocket "$Key\n";
   
       lonssl::Close($SSLSocket); 
   
       Debug("Key exchange complete: $Key");
   
       return $Key;
   }
   #
   #     InsecureConnection: 
   #        If insecure connections are allowd,
   #        exchange a challenge with the client to 'validate' the
   #        client (not really, but that's the protocol):
   #        We produce a challenge string that's sent to the client.
   #        The client must then echo the challenge verbatim to us.
   #
   #  Parameter:
   #      Socket      - Socket open on the client.
   #  Returns:
   #      1           - success.
   #      0           - failure (e.g.mismatch or insecure not allowed).
   #
   sub InsecureConnection {
       my $Socket  =  shift;
   
       #   Don't even start if insecure connections are not allowed.
   
       if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
    return 0;
       }
   
       #   Fabricate a challenge string and send it..
   
       my $challenge = "$$".time; # pid + time.
       print $Socket "$challenge\n";
       &status("Waiting for challenge reply");
   
       my $answer = <$Socket>;
       $answer    =~s/\W//g;
       if($challenge eq $answer) {
    return 1;
       } else {
    logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
    &status("No challenge reqply");
    return 0;
       }
       
   
   }
   #
   #   Safely execute a command (as long as it's not a shel command and doesn
   #   not require/rely on shell escapes.   The function operates by doing a
   #   a pipe based fork and capturing stdout and stderr  from the pipe.
   #
   # Formal Parameters:
   #     $line                    - A line of text to be executed as a command.
   # Returns:
   #     The output from that command.  If the output is multiline the caller
   #     must know how to split up the output.
   #
   #
   sub execute_command {
       my ($line)    = @_;
       my @words     = split(/\s/, $line); # Bust the command up into words.
       my $output    = "";
   
       my $pid = open(CHILD, "-|");
       
       if($pid) { # Parent process
    Debug("In parent process for execute_command");
    my @data = <CHILD>; # Read the child's outupt...
    close CHILD;
    foreach my $output_line (@data) {
       Debug("Adding $output_line");
       $output .= $output_line; # Presumably has a \n on it.
    }
   
       } else { # Child process
    close (STDERR);
    open  (STDERR, ">&STDOUT");# Combine stderr, and stdout...
    exec(@words); # won't return.
       }
       return $output;
   }
   
   
   #   GetCertificate: Given a transaction that requires a certificate,
   #   this function will extract the certificate from the transaction
   #   request.  Note that at this point, the only concept of a certificate
   #   is the hostname to which we are connected.
   #
   #   Parameter:
   #      request   - The request sent by our client (this parameterization may
   #                  need to change when we really use a certificate granting
   #                  authority.
   #
   sub GetCertificate {
       my $request = shift;
   
       return $clientip;
   }
   
 #  #
 #   Return true if client is a manager.  #   Return true if client is a manager.
 #  #
Line 164  sub isClient { Line 390  sub isClient {
   
   
 #  #
 #   Get a Request:  #   ReadManagerTable: Reads in the current manager table. For now this is
 #   Gets a Request message from the client.  The transaction  #                     done on each manager authentication because:
 #   is defined as a 'line' of text.  We remove the new line  #                     - These authentications are not frequent
 #   from the text line.    #                     - This allows dynamic changes to the manager table
 #     #                       without the need to signal to the lond.
 sub GetRequest {  #
     my $input = <$client>;  sub ReadManagerTable {
     chomp($input);  
   
     Debug("Request = $input\n");      #   Clean out the old table first..
   
     &status('Processing '.$clientname.':'.$input);     foreach my $key (keys %managers) {
         delete $managers{$key};
      }
   
     return $input;     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
      if (!open (MANAGERS, $tablename)) {
         logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
         return;
      }
      while(my $host = <MANAGERS>) {
         chomp($host);
         if ($host =~ "^#") {                  # Comment line.
            next;
         }
         if (!defined &Apache::lonnet::get_host_ip($host)) { # This is a non cluster member
       #  The entry is of the form:
       #    cluname:hostname
       #  cluname - A 'cluster hostname' is needed in order to negotiate
       #            the host key.
       #  hostname- The dns name of the host.
       #
             my($cluname, $dnsname) = split(/:/, $host);
             
             my $ip = gethostbyname($dnsname);
             if(defined($ip)) {                 # bad names don't deserve entry.
               my $hostip = inet_ntoa($ip);
               $managers{$hostip} = $cluname;
               logthis('<font color="green"> registering manager '.
                       "$dnsname as $cluname with $hostip </font>\n");
            }
         } else {
            logthis('<font color="green"> existing host'." $host</font>\n");
            $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
         }
      }
 }  }
   
   #
   #  ValidManager: Determines if a given certificate represents a valid manager.
   #                in this primitive implementation, the 'certificate' is
   #                just the connecting loncapa client name.  This is checked
   #                against a valid client list in the configuration.
   #
   #                  
   sub ValidManager {
       my $certificate = shift; 
   
       return isManager;
   }
   #
   #  CopyFile:  Called as part of the process of installing a 
   #             new configuration file.  This function copies an existing
   #             file to a backup file.
   # Parameters:
   #     oldfile  - Name of the file to backup.
   #     newfile  - Name of the backup file.
   # Return:
   #     0   - Failure (errno has failure reason).
   #     1   - Success.
   #
   sub CopyFile {
   
       my ($oldfile, $newfile) = @_;
   
       if (! copy($oldfile,$newfile)) {
           return 0;
       }
       chmod(0660, $newfile);
       return 1;
   }
   #
   #  Host files are passed out with externally visible host IPs.
   #  If, for example, we are behind a fire-wall or NAT host, our 
   #  internally visible IP may be different than the externally
   #  visible IP.  Therefore, we always adjust the contents of the
   #  host file so that the entry for ME is the IP that we believe
   #  we have.  At present, this is defined as the entry that
   #  DNS has for us.  If by some chance we are not able to get a
   #  DNS translation for us, then we assume that the host.tab file
   #  is correct.  
   #    BUGBUGBUG - in the future, we really should see if we can
   #       easily query the interface(s) instead.
   # Parameter(s):
   #     contents    - The contents of the host.tab to check.
   # Returns:
   #     newcontents - The adjusted contents.
   #
   #
   sub AdjustHostContents {
       my $contents  = shift;
       my $adjusted;
       my $me        = $perlvar{'lonHostID'};
   
       foreach my $line (split(/\n/,$contents)) {
    if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
       chomp($line);
       my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
       if ($id eq $me) {
    my $ip = gethostbyname($name);
    my $ipnew = inet_ntoa($ip);
    $ip = $ipnew;
    #  Reconstruct the host line and append to adjusted:
   
    my $newline = "$id:$domain:$role:$name:$ip";
    if($maxcon ne "") { # Not all hosts have loncnew tuning params
       $newline .= ":$maxcon:$idleto:$mincon";
    }
    $adjusted .= $newline."\n";
   
       } else { # Not me, pass unmodified.
    $adjusted .= $line."\n";
       }
    } else {                  # Blank or comment never re-written.
       $adjusted .= $line."\n"; # Pass blanks and comments as is.
    }
       }
       return $adjusted;
   }
   #
   #   InstallFile: Called to install an administrative file:
   #       - The file is created with <name>.tmp
   #       - The <name>.tmp file is then mv'd to <name>
   #   This lugubrious procedure is done to ensure that we are never without
   #   a valid, even if dated, version of the file regardless of who crashes
   #   and when the crash occurs.
 #  #
 #   Decipher encoded traffic  
 #  Parameters:  #  Parameters:
 #     input      - Encoded data.  #       Name of the file
   #       File Contents.
   #  Return:
   #      nonzero - success.
   #      0       - failure and $! has an errno.
   #
   sub InstallFile {
   
       my ($Filename, $Contents) = @_;
       my $TempFile = $Filename.".tmp";
   
       #  Open the file for write:
   
       my $fh = IO::File->new("> $TempFile"); # Write to temp.
       if(!(defined $fh)) {
    &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
    return 0;
       }
       #  write the contents of the file:
   
       print $fh ($Contents); 
       $fh->close; # In case we ever have a filesystem w. locking
   
       chmod(0660, $TempFile);
   
       # Now we can move install the file in position.
       
       move($TempFile, $Filename);
   
       return 1;
   }
   
   
   #
   #   ConfigFileFromSelector: converts a configuration file selector
   #                 into a configuration file pathname.
   #                 It's probably no longer necessary to preserve
   #                 special handling of hosts or domain as those
   #                 files have been superceded by dns_hosts, dns_domain.
   #                 The default action is just to prepend the directory
   #                 and append .tab
   #
   #
   #  Parameters:
   #      selector  - Configuration file selector.
 #  Returns:  #  Returns:
 #     Decoded data or undef if encryption key was not yet negotiated.  #      Full path to the file or undef if the selector is invalid.
 #  Implicit input:  
 #     cipher  - This global holds the negotiated encryption key.  
 #  #
 sub Decipher {  sub ConfigFileFromSelector {
    my $input  = shift;      my $selector   = shift;
    my $output = '';      my $tablefile;
      
          my $tabledir = $perlvar{'lonTabDir'}.'/';
    if($cipher) {      if ($selector eq "hosts") {
       my($enc, $enclength, $encinput) = split(/:/, $input);   $tablefile = $tabledir."hosts.tab";
       for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {      } elsif ($selector eq "domain") {
          $output .=    $tablefile = $tabledir."domain.tab";
             $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));      } else {
       }   $tablefile =  $tabledir.$selector.'.tab';
       return substr($output, 0, $enclength);      }
    } else {      return $tablefile;
       return undef;  
    }  }
      #
   #   PushFile:  Called to do an administrative push of a file.
   #              - Ensure the file being pushed is one we support.
   #              - Backup the old file to <filename.saved>
   #              - Separate the contents of the new file out from the
   #                rest of the request.
   #              - Write the new file.
   #  Parameter:
   #     Request - The entire user request.  This consists of a : separated
   #               string pushfile:tablename:contents.
   #     NOTE:  The contents may have :'s in it as well making things a bit
   #            more interesting... but not much.
   #  Returns:
   #     String to send to client ("ok" or "refused" if bad file).
   #
   sub PushFile {
       my $request = shift;    
       my ($command, $filename, $contents) = split(":", $request, 3);
       
       #  At this point in time, pushes for only the following tables are
       #  supported:
       #   hosts.tab  ($filename eq host).
       #   domain.tab ($filename eq domain).
       # Construct the destination filename or reject the request.
       #
       # lonManage is supposed to ensure this, however this session could be
       # part of some elaborate spoof that managed somehow to authenticate.
       #
   
   
       my $tablefile = ConfigFileFromSelector($filename);
       if(! (defined $tablefile)) {
    return "refused";
       }
       #
       # >copy< the old table to the backup table
       #        don't rename in case system crashes/reboots etc. in the time
       #        window between a rename and write.
       #
       my $backupfile = $tablefile;
       $backupfile    =~ s/\.tab$/.old/;
       if(!CopyFile($tablefile, $backupfile)) {
    &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
    return "error:$!";
       }
       &logthis('<font color="green"> Pushfile: backed up '
       .$tablefile." to $backupfile</font>");
       
       #  If the file being pushed is the host file, we adjust the entry for ourself so that the
       #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
       #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
       #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
       #  that possibilty.
   
       if($filename eq "host") {
    $contents = AdjustHostContents($contents);
       }
   
       #  Install the new file:
   
       if(!InstallFile($tablefile, $contents)) {
    &logthis('<font color="red"> Pushfile: unable to install '
    .$tablefile." $! </font>");
    return "error:$!";
       } else {
    &logthis('<font color="green"> Installed new '.$tablefile
    ."</font>");
   
       }
   
   
       #  Indicate success:
    
       return "ok";
   
 }  }
   
 #  #
 #   Register a command processor.  This function is invoked to register a sub  #  Called to re-init either lonc or lond.
 #   to process a request.  Once registered, the ProcessRequest sub can automatically  #
 #   dispatch requests to an appropriate sub, and do the top level validity checking  #  Parameters:
 #   as well:  #    request   - The full request by the client.  This is of the form
 #    - Is the keyword recognized.  #                reinit:<process>  
 #    - Is the proper client type attempting the request.  #                where <process> is allowed to be either of 
 #    - Is the request encrypted if it has to be.  #                lonc or lond
   #
   #  Returns:
   #     The string to be sent back to the client either:
   #   ok         - Everything worked just fine.
   #   error:why  - There was a failure and why describes the reason.
   #
   #
   sub ReinitProcess {
       my $request = shift;
   
   
       # separate the request (reinit) from the process identifier and
       # validate it producing the name of the .pid file for the process.
       #
       #
       my ($junk, $process) = split(":", $request);
       my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
       if($process eq 'lonc') {
    $processpidfile = $processpidfile."lonc.pid";
    if (!open(PIDFILE, "< $processpidfile")) {
       return "error:Open failed for $processpidfile";
    }
    my $loncpid = <PIDFILE>;
    close(PIDFILE);
    logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
    ."</font>");
    kill("USR2", $loncpid);
       } elsif ($process eq 'lond') {
    logthis('<font color="red"> Reinitializing self (lond) </font>');
    &UpdateHosts; # Lond is us!!
       } else {
    &logthis('<font color="yellow" Invalid reinit request for '.$process
    ."</font>");
    return "error:Invalid process identifier $process";
       }
       return 'ok';
   }
   #   Validate a line in a configuration file edit script:
   #   Validation includes:
   #     - Ensuring the command is valid.
   #     - Ensuring the command has sufficient parameters
 #   Parameters:  #   Parameters:
 #    $RequestName         - Name of the request being registered.  #     scriptline - A line to validate (\n has been stripped for what it's worth).
 #                           This is the command request that will match  
 #                           against the hash keywords to lookup the information  
 #                           associated with the dispatch information.  
 #    $Procedure           - Reference to a sub to call to process the request.  
 #                           All subs get called as follows:  
 #                             Procedure($cmd, $tail, $replyfd, $key)  
 #                             $cmd    - the actual keyword that invoked us.  
 #                             $tail   - the tail of the request that invoked us.  
 #                             $replyfd- File descriptor connected to the client  
 #    $MustEncode          - True if the request must be encoded to be good.  
 #    $ClientOk            - True if it's ok for a client to request this.  
 #    $ManagerOk           - True if it's ok for a manager to request this.  
 # Side effects:  
 #      - On success, the Dispatcher hash has an entry added for the key $RequestName  
 #      - On failure, the program will die as it's a bad internal bug to try to   
 #        register a duplicate command handler.  
 #  #
 sub RegisterHandler {  #   Return:
    my $RequestName    = shift;  #      0     - Invalid scriptline.
    my $Procedure      = shift;  #      1     - Valid scriptline
    my $MustEncode     = shift;  #  NOTE:
    my $ClientOk       = shift;  #     Only the command syntax is checked, not the executability of the
    my $ManagerOk      = shift;  #     command.
      #
    #  Don't allow duplication#  sub isValidEditCommand {
          my $scriptline = shift;
    if (defined $Dispatcher{$RequestName}) {  
       die "Attempting to define a duplicate request handler for $RequestName\n";      #   Line elements are pipe separated:
    }  
    #   Build the client type mask:      my ($command, $key, $newline)  = split(/\|/, $scriptline);
          &logthis('<font color="green"> isValideditCommand checking: '.
    my $ClientTypeMask = 0;       "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
    if($ClientOk) {      
       $ClientTypeMask  |= $CLIENT_OK;      if ($command eq "delete") {
    }   #
    if($ManagerOk) {   #   key with no newline.
       $ClientTypeMask  |= $MANAGER_OK;   #
    }   if( ($key eq "") || ($newline ne "")) {
          return 0; # Must have key but no newline.
    #  Enter the hash:   } else {
             return 1; # Valid syntax.
    my @entry = ($Procedure, $MustEncode, $ClientTypeMask);   }
          } elsif ($command eq "replace") {
    $Dispatcher{$RequestName} = \@entry;   #
       #   key and newline:
       #
    if (($key eq "") || ($newline eq "")) {
       return 0;
    } else {
       return 1;
    }
       } elsif ($command eq "append") {
    if (($key ne "") && ($newline eq "")) {
       return 1;
    } else {
       return 0;
    }
       } else {
    return 0; # Invalid command.
       }
       return 0; # Should not get here!!!
   }
   #
   #   ApplyEdit - Applies an edit command to a line in a configuration 
   #               file.  It is the caller's responsiblity to validate the
   #               edit line.
   #   Parameters:
   #      $directive - A single edit directive to apply.  
   #                   Edit directives are of the form:
   #                  append|newline      - Appends a new line to the file.
   #                  replace|key|newline - Replaces the line with key value 'key'
   #                  delete|key          - Deletes the line with key value 'key'.
   #      $editor   - A config file editor object that contains the
   #                  file being edited.
   #
   sub ApplyEdit {
   
       my ($directive, $editor) = @_;
   
       # Break the directive down into its command and its parameters
       # (at most two at this point.  The meaning of the parameters, if in fact
       #  they exist depends on the command).
   
       my ($command, $p1, $p2) = split(/\|/, $directive);
   
       if($command eq "append") {
    $editor->Append($p1);          # p1 - key p2 null.
       } elsif ($command eq "replace") {
    $editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
       } elsif ($command eq "delete") {
    $editor->DeleteLine($p1);         # p1 - key p2 null.
       } else {          # Should not get here!!!
    die "Invalid command given to ApplyEdit $command"
       }
   }
   #
   # AdjustOurHost:
   #           Adjusts a host file stored in a configuration file editor object
   #           for the true IP address of this host. This is necessary for hosts
   #           that live behind a firewall.
   #           Those hosts have a publicly distributed IP of the firewall, but
   #           internally must use their actual IP.  We assume that a given
   #           host only has a single IP interface for now.
   # Formal Parameters:
   #     editor   - The configuration file editor to adjust.  This
   #                editor is assumed to contain a hosts.tab file.
   # Strategy:
   #    - Figure out our hostname.
   #    - Lookup the entry for this host.
   #    - Modify the line to contain our IP
   #    - Do a replace for this host.
   sub AdjustOurHost {
       my $editor        = shift;
   
       # figure out who I am.
   
       my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
   
       #  Get my host file entry.
   
       my $ConfigLine    = $editor->Find($myHostName);
       if(! (defined $ConfigLine)) {
    die "AdjustOurHost - no entry for me in hosts file $myHostName";
       }
       # figure out my IP:
       #   Use the config line to get my hostname.
       #   Use gethostbyname to translate that into an IP address.
       #
       my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
       #
       #  Reassemble the config line from the elements in the list.
       #  Note that if the loncnew items were not present before, they will
       #  be now even if they would be empty
       #
       my $newConfigLine = $id;
       foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) {
    $newConfigLine .= ":".$item;
       }
       #  Replace the line:
   
       $editor->ReplaceLine($id, $newConfigLine);
       
   }
   #
   #   ReplaceConfigFile:
   #              Replaces a configuration file with the contents of a
   #              configuration file editor object.
   #              This is done by:
   #              - Copying the target file to <filename>.old
   #              - Writing the new file to <filename>.tmp
   #              - Moving <filename.tmp>  -> <filename>
   #              This laborious process ensures that the system is never without
   #              a configuration file that's at least valid (even if the contents
   #              may be dated).
   #   Parameters:
   #        filename   - Name of the file to modify... this is a full path.
   #        editor     - Editor containing the file.
   #
   sub ReplaceConfigFile {
       
       my ($filename, $editor) = @_;
   
       CopyFile ($filename, $filename.".old");
   
       my $contents  = $editor->Get(); # Get the contents of the file.
   
       InstallFile($filename, $contents);
   }
   #   
   #
   #   Called to edit a configuration table  file
   #   Parameters:
   #      request           - The entire command/request sent by lonc or lonManage
   #   Return:
   #      The reply to send to the client.
   #
   sub EditFile {
       my $request = shift;
   
       #  Split the command into it's pieces:  edit:filetype:script
   
       my ($cmd, $filetype, $script) = split(/:/, $request,3); # : in script
   
       #  Check the pre-coditions for success:
   
       if($cmd != "edit") { # Something is amiss afoot alack.
    return "error:edit request detected, but request != 'edit'\n";
       }
       if( ($filetype ne "hosts")  &&
    ($filetype ne "domain")) {
    return "error:edit requested with invalid file specifier: $filetype \n";
       }
   
       #   Split the edit script and check it's validity.
   
       my @scriptlines = split(/\n/, $script);  # one line per element.
       my $linecount   = scalar(@scriptlines);
       for(my $i = 0; $i < $linecount; $i++) {
    chomp($scriptlines[$i]);
    if(!isValidEditCommand($scriptlines[$i])) {
       return "error:edit with bad script line: '$scriptlines[$i]' \n";
    }
       }
   
       #   Execute the edit operation.
       #   - Create a config file editor for the appropriate file and 
       #   - execute each command in the script:
       #
       my $configfile = ConfigFileFromSelector($filetype);
       if (!(defined $configfile)) {
    return "refused\n";
       }
       my $editor = ConfigFileEdit->new($configfile);
   
       for (my $i = 0; $i < $linecount; $i++) {
    ApplyEdit($scriptlines[$i], $editor);
       }
       # If the file is the host file, ensure that our host is
       # adjusted to have our ip:
       #
       if($filetype eq "host") {
    AdjustOurHost($editor);
       }
       #  Finally replace the current file with our file.
       #
       ReplaceConfigFile($configfile, $editor);
   
       return "ok\n";
 }  }
   
   #   read_profile
   #
   #   Returns a set of specific entries from a user's profile file.
   #   this is a utility function that is used by both get_profile_entry and
   #   get_profile_entry_encrypted.
   #
   # Parameters:
   #    udom       - Domain in which the user exists.
   #    uname      - User's account name (loncapa account)
   #    namespace  - The profile namespace to open.
   #    what       - A set of & separated queries.
   # Returns:
   #    If all ok: - The string that needs to be shipped back to the user.
   #    If failure - A string that starts with error: followed by the failure
   #                 reason.. note that this probabyl gets shipped back to the
   #                 user as well.
   #
   sub read_profile {
       my ($udom, $uname, $namespace, $what) = @_;
       
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_READER());
       if ($hashref) {
           my @queries=split(/\&/,$what);
           my $qresult='';
   
    for (my $i=0;$i<=$#queries;$i++) {
       $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
    }
    $qresult=~s/\&$//;              # Remove trailing & from last lookup.
    if (&untie_user_hash($hashref)) {
       return $qresult;
    } else {
       return "error: ".($!+0)." untie (GDBM) Failed";
    }
       } else {
    if ($!+0 == 2) {
       return "error:No such file or GDBM reported bad block error";
    } else {
       return "error: ".($!+0)." tie (GDBM) Failed";
    }
       }
   
   }
 #--------------------- Request Handlers --------------------------------------------  #--------------------- Request Handlers --------------------------------------------
 #  #
 #   By convention each request handler registers itself prior to the sub declaration:  #   By convention each request handler registers itself prior to the sub 
   #   declaration:
 #  #
   
   #++
   #
 #  Handles ping requests.  #  Handles ping requests.
 #  Parameters:  #  Parameters:
 #      $cmd    - the actual keyword that invoked us.  #      $cmd    - the actual keyword that invoked us.
Line 282  sub RegisterHandler { Line 997  sub RegisterHandler {
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   sub ping_handler {
 sub PingHandler {      my ($cmd, $tail, $client) = @_;
    my $cmd    = shift;      Debug("$cmd $tail $client .. $currenthostid:");
    my $tail   = shift;  
    my $client = shift;  
         
    Reply( $client,"$currenthostid\n","$cmd:$tail");      Reply( $client,\$currenthostid,"$cmd:$tail");
         
    return 1;      return 1;
 }  }
 RegisterHandler("ping", \&PingHandler, 0, 1, 1);       # Ping unencoded, client or manager.  &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
   
   #++
   #
   # Handles pong requests.  Pong replies with our current host id, and
   #                         the results of a ping sent to us via our lonc.
 #  #
 # Handles pong reequests:  
 # Parameters:  # Parameters:
 #      $cmd    - the actual keyword that invoked us.  #      $cmd    - the actual keyword that invoked us.
 #      $tail   - the tail of the request that invoked us.  #      $tail   - the tail of the request that invoked us.
Line 307  RegisterHandler("ping", \&PingHandler, 0 Line 1024  RegisterHandler("ping", \&PingHandler, 0
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   sub pong_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
 sub PongHandler {      my $reply=&Apache::lonnet::reply("ping",$clientname);
    my $cmd     = shift;      &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
    my $tail    = shift;      return 1;
    my $replyfd = shift;  
   
    my $reply=&reply("ping",$clientname);  
    Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");   
    return 1;  
 }  }
 RegisterHandler("pong", \&PongHandler, 0, 1, 1);       # Pong unencoded, client or manager  &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
   
 #  #++
 #   EstablishKeyHandler:  
 #      Called to establish an encrypted session key with the remote client.  #      Called to establish an encrypted session key with the remote client.
 #  #      Note that with secure lond, in most cases this function is never
   #      invoked.  Instead, the secure session key is established either
   #      via a local file that's locked down tight and only lives for a short
   #      time, or via an ssl tunnel...and is generated from a bunch-o-random
   #      bits from /dev/urandom, rather than the predictable pattern used by
   #      by this sub.  This sub is only used in the old-style insecure
   #      key negotiation.
 # Parameters:  # Parameters:
 #      $cmd    - the actual keyword that invoked us.  #      $cmd    - the actual keyword that invoked us.
 #      $tail   - the tail of the request that invoked us.  #      $tail   - the tail of the request that invoked us.
Line 338  RegisterHandler("pong", \&PongHandler, 0 Line 1057  RegisterHandler("pong", \&PongHandler, 0
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
 #      $cipher is set with a reference to a new IDEA encryption object.  #      $cipher is set with a reference to a new IDEA encryption object.
 #  #
 sub EstablishKeyHandler {  sub establish_key_handler {
    my $cmd      = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail     = shift;  
    my $replyfd  = shift;      my $buildkey=time.$$.int(rand 100000);
       $buildkey=~tr/1-6/A-F/;
    my $buildkey=time.$$.int(rand 100000);      $buildkey=int(rand 100000).$buildkey.int(rand 100000);
    $buildkey=~tr/1-6/A-F/;      my $key=$currenthostid.$clientname;
    $buildkey=int(rand 100000).$buildkey.int(rand 100000);      $key=~tr/a-z/A-Z/;
    my $key=$currenthostid.$clientname;      $key=~tr/G-P/0-9/;
    $key=~tr/a-z/A-Z/;      $key=~tr/Q-Z/0-9/;
    $key=~tr/G-P/0-9/;      $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
    $key=~tr/Q-Z/0-9/;      $key=substr($key,0,32);
    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;      my $cipherkey=pack("H32",$key);
    $key=substr($key,0,32);      $cipher=new IDEA $cipherkey;
    my $cipherkey=pack("H32",$key);      &Reply($replyfd, \$buildkey, "$cmd:$tail"); 
    $cipher=new IDEA $cipherkey;  
    Reply($replyfd, "$buildkey\n", "$cmd:$tail");   
         
    return 1;      return 1;
   
 }  }
 RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1);  &register_handler("ekey", \&establish_key_handler, 0, 1,1);
   
 #  LoadHandler:  
 #     Handler for the load command.  Returns the current system load average  #     Handler for the load command.  Returns the current system load average
 #     to the requestor.  #     to the requestor.
 #  #
Line 378  RegisterHandler("ekey", \&EstablishKeyHa Line 1094  RegisterHandler("ekey", \&EstablishKeyHa
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
 sub LoadHandler {  sub load_handler {
    my $cmd     = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail    = shift;  
    my $replyfd = shift;  
   
    # Get the load average from /proc/loadavg and calculate it as a percentage of     # Get the load average from /proc/loadavg and calculate it as a percentage of
    # the allowed load limit as set by the perl global variable lonLoadLim     # the allowed load limit as set by the perl global variable lonLoadLim
   
    my $loadavg;      my $loadavg;
    my $loadfile=IO::File->new('/proc/loadavg');      my $loadfile=IO::File->new('/proc/loadavg');
         
    $loadavg=<$loadfile>;      $loadavg=<$loadfile>;
    $loadavg =~ s/\s.*//g;                       # Extract the first field only.      $loadavg =~ s/\s.*//g;                      # Extract the first field only.
         
    my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};      my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
   
    Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");      &Reply( $replyfd, \$loadpercent, "$cmd:$tail");
         
    return 1;      return 1;
 }  }
 RegisterHandler("load", \&LoadHandler, 0, 1, 0);  &register_handler("load", \&load_handler, 0, 1, 0);
   
   
 #  #
 #   Process the userload request.  This sub returns to the client the current  #   Process the userload request.  This sub returns to the client the current
Line 421  RegisterHandler("load", \&LoadHandler, 0 Line 1134  RegisterHandler("load", \&LoadHandler, 0
 #  Implicit outputs:  #  Implicit outputs:
 #     the reply is written to the client.  #     the reply is written to the client.
 #  #
 sub UserLoadHandler {  sub user_load_handler {
    my $cmd     = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail    = shift;  
    my $replyfd = shift;  
   
    my $userloadpercent=&userload();  
    Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");  
   
    return 1;      my $userloadpercent=&Apache::lonnet::userload();
       &Reply($replyfd, \$userloadpercent, "$cmd:$tail");
       
       return 1;
 }  }
 RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0);  &register_handler("userload", \&user_load_handler, 0, 1, 0);
   
 #   Process a request for the authorization type of a user:  #   Process a request for the authorization type of a user:
 #   (userauth).  #   (userauth).
Line 446  RegisterHandler("userload", \&UserLoadHa Line 1157  RegisterHandler("userload", \&UserLoadHa
 # Implicit outputs:  # Implicit outputs:
 #    The user authorization type is written to the client.  #    The user authorization type is written to the client.
 #  #
 sub UserAuthorizationType {  sub user_authorization_type {
    my $cmd     = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail    = shift;  
    my $replyfd = shift;  
         
    my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
         
    #  Pull the domain and username out of the command tail.      #  Pull the domain and username out of the command tail.
    # and call GetAuthType to determine the authentication type.      # and call get_auth_type to determine the authentication type.
         
    my ($udom,$uname)=split(/:/,$tail);      my ($udom,$uname)=split(/:/,$tail);
    my $result = GetAuthType($udom, $uname);      my $result = &get_auth_type($udom, $uname);
    if($result eq "nouser") {      if($result eq "nouser") {
       Failure( $replyfd, "unknown_user\n", $userinput);   &Failure( $replyfd, "unknown_user\n", $userinput);
    } else {      } else {
       Reply( $replyfd, "$result\n", $userinput);   #
    }   # We only want to pass the second field from get_auth_type
    # for ^krb.. otherwise we'll be handing out the encrypted
    # password for internals e.g.
    #
    my ($type,$otherinfo) = split(/:/,$result);
    if($type =~ /^krb/) {
       $type = $result;
    } else {
               $type .= ':';
           }
    &Reply( $replyfd, \$type, $userinput);
       }
       
    return 1;      return 1;
 }  }
 RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0);  &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
 #  
 #   Process a request by a manager to push a hosts or domain table   #   Process a request by a manager to push a hosts or domain table 
 #   to us.  We pick apart the command and pass it on to the subs  #   to us.  We pick apart the command and pass it on to the subs
 #   that already exist to do this.  #   that already exist to do this.
Line 481  RegisterHandler("currentauth", \&UserAut Line 1201  RegisterHandler("currentauth", \&UserAut
 #      0       - Program should exit  #      0       - Program should exit
 # Implicit Output:  # Implicit Output:
 #    a reply is written to the client.  #    a reply is written to the client.
   sub push_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
   
 sub PushFileHandler {      # At this time we only know that the IP of our partner is a valid manager
    my $cmd    = shift;      # the code below is a hook to do further authentication (e.g. to resolve
    my $tail   = shift;      # spoofing).
    my $client = shift;  
   
    my $userinput = "$cmd:$tail";  
   
    # At this time we only know that the IP of our partner is a valid manager  
    # the code below is a hook to do further authentication (e.g. to resolve  
    # spoofing).  
   
    my $cert = GetCertificate($userinput);      my $cert = &GetCertificate($userinput);
    if(ValidManager($cert)) {       if(&ValidManager($cert)) { 
   
       # Now presumably we have the bona fides of both the peer host and the   # Now presumably we have the bona fides of both the peer host and the
       # process making the request.   # process making the request.
               
       my $reply = PushFile($userinput);   my $reply = &PushFile($userinput);
       Reply($client, "$reply\n", $userinput);   &Reply($client, \$reply, $userinput);
   
       } else {
    &Failure( $client, "refused\n", $userinput);
       } 
       return 1;
   }
   &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
   
   # The du_handler routine should be considered obsolete and is retained
   # for communication with legacy servers.  Please see the du2_handler.
   #
   #   du  - list the disk usage of a directory recursively. 
   #    
   #   note: stolen code from the ls file handler
   #   under construction by Rick Banghart 
   #    .
   # Parameters:
   #    $cmd        - The command that dispatched us (du).
   #    $ududir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub du_handler {
       my ($cmd, $ududir, $client) = @_;
       ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
       my $userinput = "$cmd:$ududir";
   
       if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
    &Failure($client,"refused\n","$cmd:$ududir");
    return 1;
       }
       #  Since $ududir could have some nasties in it,
       #  we will require that ududir is a valid
       #  directory.  Just in case someone tries to
       #  slip us a  line like .;(cd /home/httpd rm -rf*)
       #  etc.
       #
       if (-d $ududir) {
    my $total_size=0;
    my $code=sub { 
       if ($_=~/\.\d+\./) { return;} 
       if ($_=~/\.meta$/) { return;}
       if (-d $_)         { return;}
       $total_size+=(stat($_))[7];
    };
    chdir($ududir);
    find($code,$ududir);
    $total_size=int($total_size/1024);
    &Reply($client,\$total_size,"$cmd:$ududir");
       } else {
    &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 
       }
       return 1;
   }
   &register_handler("du", \&du_handler, 0, 1, 0);
   
   # Please also see the du_handler, which is obsoleted by du2. 
   # du2_handler differs from du_handler in that required path to directory
   # provided by &propath() is prepended in the handler instead of on the 
   # client side.
   #
   #   du2  - list the disk usage of a directory recursively.
   #
   # Parameters:
   #    $cmd        - The command that dispatched us (du).
   #    $tail       - The tail of the request that invoked us.
   #                  $tail is a : separated list of the following:
   #                   - $ududir - directory path to list (before prepending)
   #                   - $getpropath = 1 if &propath() should prepend
   #                   - $uname - username to use for &propath or user dir
   #                   - $udom - domain to use for &propath or user dir
   #                   All are escaped.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to $client.
   #
   
   sub du2_handler {
       my ($cmd, $tail, $client) = @_;
       my ($ududir,$getpropath,$uname,$udom) = map { &unescape($_) } (split(/:/, $tail));
       my $userinput = "$cmd:$tail";
       if (($ududir=~/\.\./) || (($ududir!~m|^/home/httpd/|) && (!$getpropath))) {
           &Failure($client,"refused\n","$cmd:$tail");
           return 1;
       }
       if ($getpropath) {
           if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
               $ududir = &propath($udom,$uname).'/'.$ududir;
           } else {
               &Failure($client,"refused\n","$cmd:$tail");
               return 1;
           }
       }
       #  Since $ududir could have some nasties in it,
       #  we will require that ududir is a valid
       #  directory.  Just in case someone tries to
       #  slip us a  line like .;(cd /home/httpd rm -rf*)
       #  etc.
       #
       if (-d $ududir) {
           my $total_size=0;
           my $code=sub {
               if ($_=~/\.\d+\./) { return;}
               if ($_=~/\.meta$/) { return;}
               if (-d $_)         { return;}
               $total_size+=(stat($_))[7];
           };
           chdir($ududir);
           find($code,$ududir);
           $total_size=int($total_size/1024);
           &Reply($client,\$total_size,"$cmd:$ududir");
       } else {
           &Failure($client, "bad_directory:$ududir\n","$cmd:$tail");
       }
       return 1;
   }
   &register_handler("du2", \&du2_handler, 0, 1, 0);
   
   #
   # The ls_handler routine should be considered obsolete and is retained
   # for communication with legacy servers.  Please see the ls3_handler.
   #
   #   ls  - list the contents of a directory.  For each file in the
   #    selected directory the filename followed by the full output of
   #    the stat function is returned.  The returned info for each
   #    file are separated by ':'.  The stat fields are separated by &'s.
   # Parameters:
   #    $cmd        - The command that dispatched us (ls).
   #    $ulsdir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub ls_handler {
       # obsoleted by ls2_handler
       my ($cmd, $ulsdir, $client) = @_;
   
       my $userinput = "$cmd:$ulsdir";
   
       my $obs;
       my $rights;
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
    if(-d $ulsdir) {
       if (opendir(LSDIR,$ulsdir)) {
    while ($ulsfn=readdir(LSDIR)) {
       undef($obs);
       undef($rights); 
       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
       #We do some obsolete checking here
       if(-e $ulsdir.'/'.$ulsfn.".meta") { 
    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
    my @obsolete=<FILE>;
    foreach my $obsolete (@obsolete) {
       if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
       if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
    }
       }
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
       if($obs eq '1') { $ulsout.="&1"; }
       else { $ulsout.="&0"; }
       if($rights eq '1') { $ulsout.="&1:"; }
       else { $ulsout.="&0:"; }
    }
    closedir(LSDIR);
       }
    } else {
       my @ulsstats=stat($ulsdir);
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
    }
       } else {
    $ulsout='no_such_dir';
       }
       if ($ulsout eq '') { $ulsout='empty'; }
       &Reply($client, \$ulsout, $userinput); # This supports debug logging.
       
       return 1;
   
    } else {  
       Failure( $client, "refused\n", $userinput);  
    }   
 }  }
 RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1);  &register_handler("ls", \&ls_handler, 0, 1, 0);
   
   # The ls2_handler routine should be considered obsolete and is retained
   # for communication with legacy servers.  Please see the ls3_handler.
   # Please also see the ls_handler, which was itself obsoleted by ls2.
   # ls2_handler differs from ls_handler in that it escapes its return 
   # values before concatenating them together with ':'s.
   #
   #   ls2  - list the contents of a directory.  For each file in the
   #    selected directory the filename followed by the full output of
   #    the stat function is returned.  The returned info for each
   #    file are separated by ':'.  The stat fields are separated by &'s.
   # Parameters:
   #    $cmd        - The command that dispatched us (ls).
   #    $ulsdir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub ls2_handler {
       my ($cmd, $ulsdir, $client) = @_;
   
       my $userinput = "$cmd:$ulsdir";
   
       my $obs;
       my $rights;
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
           if(-d $ulsdir) {
               if (opendir(LSDIR,$ulsdir)) {
                   while ($ulsfn=readdir(LSDIR)) {
                       undef($obs);
       undef($rights); 
                       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                       #We do some obsolete checking here
                       if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                           open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                           my @obsolete=<FILE>;
                           foreach my $obsolete (@obsolete) {
                               if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
                               if($obsolete =~ m|(<copyright>)(default)|) {
                                   $rights = 1;
                               }
                           }
                       }
                       my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                       if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       $ulsout.= &escape($tmp).':';
                   }
                   closedir(LSDIR);
               }
           } else {
               my @ulsstats=stat($ulsdir);
               $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
           }
       } else {
           $ulsout='no_such_dir';
      }
      if ($ulsout eq '') { $ulsout='empty'; }
      &Reply($client, \$ulsout, $userinput); # This supports debug logging.
      return 1;
   }
   &register_handler("ls2", \&ls2_handler, 0, 1, 0);
   #
   #   ls3  - list the contents of a directory.  For each file in the
   #    selected directory the filename followed by the full output of
   #    the stat function is returned.  The returned info for each
   #    file are separated by ':'.  The stat fields are separated by &'s.
   # Parameters:
   #    $cmd        - The command that dispatched us (ls).
   #    $tail       - The tail of the request that invoked us.
   #                  $tail is a : separated list of the following:
   #                   - $ulsdir - directory path to list (before prepending)
   #                   - $getpropath = 1 if &propath() should prepend
   #                   - $getuserdir = 1 if path to user dir in lonUsers should
   #                                     prepend
   #                   - $alternate_root - path to prepend
   #                   - $uname - username to use for &propath or user dir
   #                   - $udom - domain to use for &propath or user dir
   #            All of these except $getpropath and &getuserdir are escaped.    
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to $client.
   #
   
   sub ls3_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($ulsdir,$getpropath,$getuserdir,$alternate_root,$uname,$udom) =
           split(/:/,$tail);
       if (defined($ulsdir)) {
           $ulsdir = &unescape($ulsdir);
       }
       if (defined($alternate_root)) {
           $alternate_root = &unescape($alternate_root);
       }
       if (defined($uname)) {
           $uname = &unescape($uname);
       }
       if (defined($udom)) {
           $udom = &unescape($udom);
       }
   
       my $dir_root = $perlvar{'lonDocRoot'};
       if ($getpropath) {
           if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
               $dir_root = &propath($udom,$uname);
               $dir_root =~ s/\/$//;
           } else {
               &Failure($client,"refused\n","$cmd:$tail");
               return 1;
           }
       } elsif ($getuserdir) {
           if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
               my $subdir=$uname.'__';
               $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
               $dir_root = $Apache::lonnet::perlvar{'lonUsersDir'}
                          ."/$udom/$subdir/$uname";
           } else {
               &Failure($client,"refused\n","$cmd:$tail");
               return 1;
           }
       } elsif ($alternate_root ne '') {
           $dir_root = $alternate_root;
       }
       if (($dir_root ne '') && ($dir_root ne '/')) {
           if ($ulsdir =~ /^\//) {
               $ulsdir = $dir_root.$ulsdir;
           } else {
               $ulsdir = $dir_root.'/'.$ulsdir;
           }
       }
       my $obs;
       my $rights;
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
           if(-d $ulsdir) {
               if (opendir(LSDIR,$ulsdir)) {
                   while ($ulsfn=readdir(LSDIR)) {
                       undef($obs);
                       undef($rights);
                       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                       #We do some obsolete checking here
                       if(-e $ulsdir.'/'.$ulsfn.".meta") {
                           open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                           my @obsolete=<FILE>;
                           foreach my $obsolete (@obsolete) {
                               if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
                               if($obsolete =~ m|(<copyright>)(default)|) {
                                   $rights = 1;
                               }
                           }
                       }
                       my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                       if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       $ulsout.= &escape($tmp).':';
                   }
                   closedir(LSDIR);
               }
           } else {
               my @ulsstats=stat($ulsdir);
               $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
           }
       } else {
           $ulsout='no_such_dir';
       }
       if ($ulsout eq '') { $ulsout='empty'; }
       &Reply($client, \$ulsout, $userinput); # This supports debug logging.
       return 1;
   }
   &register_handler("ls3", \&ls3_handler, 0, 1, 0);
   
   sub server_timezone_handler {
       my ($cmd,$tail,$client) = @_;
       my $userinput = "$cmd:$tail";
       my $timezone;
       my $clockfile = '/etc/sysconfig/clock'; # Fedora/CentOS/SuSE
       my $tzfile = '/etc/timezone'; # Debian/Ubuntu
       if (-e $clockfile) {
           if (open(my $fh,"<$clockfile")) {
               while (<$fh>) {
                   next if (/^[\#\s]/);
                   if (/^(?:TIME)?ZONE\s*=\s*['"]?\s*([\w\/]+)/) {
                       $timezone = $1;
                       last;
                   }
               }
               close($fh);
           }
       } elsif (-e $tzfile) {
           if (open(my $fh,"<$tzfile")) {
               $timezone = <$fh>;
               close($fh);
               chomp($timezone);
               if ($timezone =~ m{^Etc/(\w+)$}) {
                   $timezone = $1;
               }
           }
       }
       &Reply($client,\$timezone,$userinput); # This supports debug logging.
       return 1;
   }
   &register_handler("servertimezone", \&server_timezone_handler, 0, 1, 0);
   
 #   Process a reinit request.  Reinit requests that either  #   Process a reinit request.  Reinit requests that either
 #   lonc or lond be reinitialized so that an updated   #   lonc or lond be reinitialized so that an updated 
Line 524  RegisterHandler("pushfile", \&PushFileHa Line 1638  RegisterHandler("pushfile", \&PushFileHa
 #  Implicit output:  #  Implicit output:
 #     a reply is sent to the client.  #     a reply is sent to the client.
 #  #
 sub ReinitProcessHandler {  sub reinit_process_handler {
    my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
    my $tail   = shift;  
    my $client = shift;  
         
    my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
         
    my $cert = GetCertificate($userinput);      my $cert = &GetCertificate($userinput);
    if(ValidManager($cert)) {      if(&ValidManager($cert)) {
       chomp($userinput);   chomp($userinput);
       my $reply = ReinitProcess($userinput);   my $reply = &ReinitProcess($userinput);
       Reply( $client,  "$reply\n", $userinput);   &Reply( $client,  \$reply, $userinput);
    } else {      } else {
       Failure( $client, "refused\n", $userinput);   &Failure( $client, "refused\n", $userinput);
  }      }
    return 1;      return 1;
 }  }
   &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
 RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1);  
   
 #  Process the editing script for a table edit operation.  #  Process the editing script for a table edit operation.
 #  the editing operation must be encrypted and requested by  #  the editing operation must be encrypted and requested by
Line 558  RegisterHandler("reinit", \&ReinitProces Line 1669  RegisterHandler("reinit", \&ReinitProces
 #  Implicit output:  #  Implicit output:
 #     a reply is sent to the client.  #     a reply is sent to the client.
 #  #
 sub EditTableHandler {  sub edit_table_handler {
    my $command    = shift;      my ($command, $tail, $client) = @_;
    my $tail       = shift;  
    my $client     = shift;  
         
    my $userinput = "$command:$tail";      my $userinput = "$command:$tail";
   
    my $cert = GetCertificate($userinput);      my $cert = &GetCertificate($userinput);
    if(ValidManager($cert)) {      if(&ValidManager($cert)) {
       my($filetype, $script) = split(/:/, $tail);   my($filetype, $script) = split(/:/, $tail);
       if (($filetype eq "hosts") ||    if (($filetype eq "hosts") || 
           ($filetype eq "domain")) {      ($filetype eq "domain")) {
          if($script ne "") {      if($script ne "") {
             Reply($client,            # BUGBUG - EditFile   &Reply($client,              # BUGBUG - EditFile
                   EditFile($userinput), #   could fail.        &EditFile($userinput), #   could fail.
                   $userinput);        $userinput);
          } else {      } else {
             Failure($client,"refused\n",$userinput);   &Failure($client,"refused\n",$userinput);
          }      }
       } else {   } else {
          Failure($client,"refused\n",$userinput);      &Failure($client,"refused\n",$userinput);
       }   }
    } else {      } else {
       Failure($client,"refused\n",$userinput);   &Failure($client,"refused\n",$userinput);
    }      }
    return 1;      return 1;
 }  }
 RegisterHandler("edit", \&EditTableHandler, 1, 0, 1);  &register_handler("edit", \&edit_table_handler, 1, 0, 1);
   
   
 #  #
 #   Authenticate a user against the LonCAPA authentication  #   Authenticate a user against the LonCAPA authentication
Line 598  RegisterHandler("edit", \&EditTableHandl Line 1706  RegisterHandler("edit", \&EditTableHandl
 #                internal per user password file.  #                internal per user password file.
 #   - kerberos - The user can be authenticated against either a kerb4 or kerb5  #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
 #                ticket granting authority.  #                ticket granting authority.
 #   - user     - The person tailoring LonCAPA can supply a user authentication mechanism  #   - user     - The person tailoring LonCAPA can supply a user authentication
 #                that is per system.  #                mechanism that is per system.
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
Line 612  RegisterHandler("edit", \&EditTableHandl Line 1720  RegisterHandler("edit", \&EditTableHandl
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 #  #
 sub AuthenticateHandler {  sub authenticate_handler {
    my $cmd        = shift;      my ($cmd, $tail, $client) = @_;
    my $tail       = shift;  
    my $client     = shift;  
      
    #  Regenerate the full input line   
      
    my $userinput  = $cmd.":".$tail;  
   
    #  udom    - User's domain.      
    #  uname   - Username.      #  Regenerate the full input line 
    #  upass   - User's password.      
          my $userinput  = $cmd.":".$tail;
    my ($udom,$uname,$upass)=split(/:/,$tail);      
    chomp($upass);      #  udom    - User's domain.
    $upass=unescape($upass);      #  uname   - Username.
    my $proname=propath($udom,$uname);      #  upass   - User's password.
    my $passfilename="$proname/passwd";      #  checkdefauth - Pass to validate_user() to try authentication
          #                 with default auth type(s) if no user account.
    #   The user's 'personal' loncapa passworrd file describes how to authenticate:      
          my ($udom, $uname, $upass, $checkdefauth)=split(/:/,$tail);
    if (-e $passfilename) {      &Debug(" Authenticate domain = $udom, user = $uname, password = $upass,  checkdefauth = $checkdefauth");
       my $pf = IO::File->new($passfilename);      chomp($upass);
       my $realpasswd=<$pf>;      $upass=&unescape($upass);
       chomp($realpasswd);  
       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);      my $pwdcorrect = &validate_user($udom,$uname,$upass,$checkdefauth);
       my $pwdcorrect=0;      if($pwdcorrect) {
       #   &Reply( $client, "authorized\n", $userinput);
       #   Authenticate against password stored in the internal file.   #
       #   #  Bad credentials: Failed to authorize
       if ($howpwd eq 'internal') {   #
          &Debug("Internal auth");      } else {
          $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);   &Failure( $client, "non_authorized\n", $userinput);
       #      }
       #   Authenticate against the unix password file.  
       #      return 1;
       } elsif ($howpwd eq 'unix') {  
          &Debug("Unix auth");  
          if((getpwnam($uname))[1] eq "") { #no such user!  
             $pwdcorrect = 0;  
          } else {  
             $contentpwd=(getpwnam($uname))[1];  
             my $pwauth_path="/usr/local/sbin/pwauth";  
             unless ($contentpwd eq 'x') {  
                $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);  
             } elsif (-e $pwauth_path) {  
                open PWAUTH, "|$pwauth_path" or  
                   die "Cannot invoke authentication";  
                print PWAUTH "$uname\n$upass\n";  
                close PWAUTH;  
                $pwdcorrect=!$?;  
             }  
          }  
       #  
       #   Authenticate against a Kerberos 4 server:  
       #  
       } elsif ($howpwd eq 'krb4') {  
          my $null=pack("C",0);  
          unless ($upass=~/$null/) {  
             my $krb4_error = &Authen::Krb4::get_pw_in_tkt($uname,  
                                                           "",  
                                                           $contentpwd,  
                                                           'krbtgt',  
                                                          $contentpwd,  
                                                          1,  
                                                          $upass);  
             if (!$krb4_error) {  
                $pwdcorrect = 1;  
             } else {   
                $pwdcorrect=0;   
                # log error if it is not a bad password  
                if ($krb4_error != 62) {  
                   &logthis('krb4:'.$uname.','.$contentpwd.','.  
                            &Authen::Krb4::get_err_txt($Authen::Krb4::error));  
                }  
             }  
          }  
       #  
       #   Authenticate against a Kerberos 5 server:  
       #  
       } elsif ($howpwd eq 'krb5') {  
          my $null=pack("C",0);  
          unless ($upass=~/$null/) {  
             my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);  
             my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;  
             my $krbserver=&Authen::Krb5::parse_name($krbservice);  
             my $credentials=&Authen::Krb5::cc_default();  
             $credentials->initialize($krbclient);  
             my $krbreturn = &Authen::Krb5::get_in_tkt_with_password(  
                                                                     $krbclient,  
                                                                     $krbserver,  
                                                                     $upass,  
                                                                     $credentials);  
             $pwdcorrect = ($krbreturn == 1);  
          } else {   
             $pwdcorrect=0;   
          }  
       #  
       #  Finally, the user may have written in an authentication module.  
       #  in that case, if requested, authenticate against it.  
       #  
       } elsif ($howpwd eq 'localauth') {  
          $pwdcorrect=&localauth::localauth($uname,$upass,$contentpwd);  
       }  
       #  
       #   Successfully authorized.  
       #  
       if ($pwdcorrect) {  
          Reply( $client, "authorized\n", $userinput);  
       #  
       #  Bad credentials: Failed to authorize  
       #  
       } else {  
          Failure( $client, "non_authorized\n", $userinput);  
       }  
    #  
    #  User bad... note it may be bad security practice to differntiate to the  
    #  caller a bad user from a  bad passwd... since that supplies covert channel  
    #  information (you have a good user but bad password e.g.) to guessers.  
    #  
    } else {  
       Failure( $client, "unknown_user\n", $userinput);  
    }  
    return 1;  
 }  }
 RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0);  &register_handler("auth", \&authenticate_handler, 1, 1, 0);
   
 #  #
 #   Change a user's password.  Note that this function is complicated by  #   Change a user's password.  Note that this function is complicated by
Line 760  RegisterHandler("auth", \&AuthenticateHa Line 1774  RegisterHandler("auth", \&AuthenticateHa
 # Implicit inputs:  # Implicit inputs:
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 sub ChangePasswordHandler {  sub change_password_handler {
    my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
    my $tail    = shift;  
    my $client  = shift;  
      
    my $userinput = $cmd.":".$tail;           # Reconstruct client's string.  
   
    #      my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
    #  udom  - user's domain.  
    #  uname - Username.      #
    #  upass - Current password.      #  udom  - user's domain.
    #  npass - New password.      #  uname - Username.
          #  upass - Current password.
    my ($udom,$uname,$upass,$npass)=split(/:/,$tail);      #  npass - New password.
    chomp($npass);      #  context - Context in which this was called 
    $upass=&unescape($upass);      #            (preferences or reset_by_email).
    $npass=&unescape($npass);     
    &Debug("Trying to change password for $uname");      my ($udom,$uname,$upass,$npass,$context)=split(/:/,$tail);
    my $proname=propath($udom,$uname);  
    my $passfilename="$proname/passwd";      $upass=&unescape($upass);
    if (-e $passfilename) {      $npass=&unescape($npass);
       my $realpasswd;      &Debug("Trying to change password for $uname");
       {   
          my $pf = IO::File->new($passfilename);      # First require that the user can be authenticated with their
          $realpasswd=<$pf>;       # old password unless context was 'reset_by_email':
       }      
       chomp($realpasswd);      my $validated;
       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);      if ($context eq 'reset_by_email') {
       if ($howpwd eq 'internal') {          $validated = 1;
          &Debug("internal auth");      } else {
          if (crypt($upass,$contentpwd) eq $contentpwd) {          $validated = &validate_user($udom, $uname, $upass);
             my $salt=time;      }
             $salt=substr($salt,6,2);      if($validated) {
             my $ncpass=crypt($npass,$salt);   my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
                {  
                   my $pf = IO::File->new(">$passfilename");   my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   if ($pf) {   if ($howpwd eq 'internal') {
                      print $pf "internal:$ncpass\n";      &Debug("internal auth");
                      &logthis("Result of password change for "      my $salt=time;
                               ."$uname: pwchange_success");      $salt=substr($salt,6,2);
                      Reply($client, "ok\n", $userinput);      my $ncpass=crypt($npass,$salt);
                   } else {      if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
                      &logthis("Unable to open $uname passwd "                  &logthis("Result of password change for "
                               ."to change password");   ."$uname: pwchange_success");
                      Failure( $client, "non_authorized\n",$userinput);   &Reply($client, "ok\n", $userinput);
                   }      } else {
                }                &logthis("Unable to open $uname passwd "               
          } else {   ."to change password");
             Failure($client, "non_authorized\n", $userinput);   &Failure( $client, "non_authorized\n",$userinput);
          }      }
       } elsif ($howpwd eq 'unix') {   } elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
          # Unix means we have to access /etc/password      my $result = &change_unix_password($uname, $npass);
          # one way or another.      &logthis("Result of password change for $uname: ".
          # First: Make sure the current password is       $result);
          #        correct      &Reply($client, \$result, $userinput);
          &Debug("auth is unix");   } else {
          $contentpwd=(getpwnam($uname))[1];      # this just means that the current password mode is not
          my $pwdcorrect = "0";      # one we know how to change (e.g the kerberos auth modes or
          my $pwauth_path="/usr/local/sbin/pwauth";      # locally written auth handler).
          unless ($contentpwd eq 'x') {      #
             $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);      &Failure( $client, "auth_mode_error\n", $userinput);
          } elsif (-e $pwauth_path) {   }  
             open PWAUTH, "|$pwauth_path" or  
                die "Cannot invoke authentication";      } else {
             print PWAUTH "$uname\n$upass\n";   &Failure( $client, "non_authorized\n", $userinput);
             close PWAUTH;      }
             &Debug("exited pwauth with $? ($uname,$upass) ");  
             $pwdcorrect=($? == 0);      return 1;
          }  
          if ($pwdcorrect) {  
             my $execdir=$perlvar{'lonDaemons'};  
             &Debug("Opening lcpasswd pipeline");  
             my $pf = IO::File->new("|$execdir/lcpasswd > "  
                                     ."$perlvar{'lonDaemons'}"  
                                     ."/logs/lcpasswd.log");  
             print $pf "$uname\n$npass\n$npass\n";  
             close $pf;  
             my $err = $?;  
             my $result = ($err>0 ? 'pwchange_failure' : 'ok');  
             &logthis("Result of password change for $uname: ".  
             &lcpasswdstrerror($?));  
             Reply($client, "$result\n", $userinput);  
          } else {  
             Reply($client, "non_authorized\n", $userinput);  
          }  
       } else {  
          Reply( $client, "auth_mode_error\n", $userinput);  
       }    
    } else {  
             Reply( $client, "unknown_user\n", $userinput);  
    }  
    return 1;  
 }  }
 RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0);  &register_handler("passwd", \&change_password_handler, 1, 1, 0);
   
 #  #
 #   Create a new user.  User in this case means a lon-capa user.  #   Create a new user.  User in this case means a lon-capa user.
Line 871  RegisterHandler("passwd", \&ChangePasswo Line 1857  RegisterHandler("passwd", \&ChangePasswo
 # Implicit inputs:  # Implicit inputs:
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 sub AddUserHandler {  sub add_user_handler {
    my $cmd     = shift;  
    my $tail    = shift;  
    my $client  = shift;  
      
    my $userinput = $cmd.":".$tail;     
   
    my $oldumask=umask(0077);      my ($cmd, $tail, $client) = @_;
    my ($udom,$uname,$umode,$npass)=split(/:/,$tail);  
    &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);  
    chomp($npass);      my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
    $npass=&unescape($npass);      my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
    my $proname=propath($udom,$uname);  
    my $passfilename="$proname/passwd";      &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
    &Debug("Password file created will be:".$passfilename);  
    if (-e $passfilename) {  
       Failure( $client, "already_exists\n", $userinput);      if($udom eq $currentdomainid) { # Reject new users for other domains...
    } elsif ($udom ne $currentdomainid) {  
       Failure($client, "not_right_domain\n", $userinput);   my $oldumask=umask(0077);
    } else {   chomp($npass);
       my @fpparts=split(/\//,$proname);   $npass=&unescape($npass);
       my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];   my $passfilename  = &password_path($udom, $uname);
       my $fperror='';   &Debug("Password file created will be:".$passfilename);
       for (my $i=3;$i<=$#fpparts;$i++) {   if (-e $passfilename) {
          $fpnow.='/'.$fpparts[$i];       &Failure( $client, "already_exists\n", $userinput);
          unless (-e $fpnow) {   } else {
             unless (mkdir($fpnow,0777)) {      my $fperror='';
                $fperror="error: ".($!+0)." mkdir failed while attempting "      if (!&mkpath($passfilename)) {
                        ."makeuser";   $fperror="error: ".($!+0)." mkdir failed while attempting "
             }      ."makeuser";
          }      }
       }      unless ($fperror) {
       unless ($fperror) {   my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
          my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);   &Reply($client,\$result, $userinput);     #BUGBUG - could be fail
          Reply($client, $result, $userinput);     #BUGBUG - could be fail      } else {
       } else {   &Failure($client, \$fperror, $userinput);
          Failure($client, "$fperror\n", $userinput);      }
       }   }
    }   umask($oldumask);
    umask($oldumask);      }  else {
    return 1;   &Failure($client, "not_right_domain\n",
    $userinput); # Even if we are multihomed.
       
       }
       return 1;
   
 }  }
 RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);  &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
   
 #  #
 #   Change the authentication method of a user.  Note that this may  #   Change the authentication method of a user.  Note that this may
Line 937  RegisterHandler("makeuser", \&AddUserHan Line 1922  RegisterHandler("makeuser", \&AddUserHan
 # Implicit inputs:  # Implicit inputs:
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
   # NOTE:
   #   This is also used to change the authentication credential values (e.g. passwd).
   #   
 #  #
 sub ChangeAuthenticationHandler {  sub change_authentication_handler {
    my $cmd     = shift;  
    my $tail    = shift;      my ($cmd, $tail, $client) = @_;
    my $client  = shift;  
         
    my $userinput  = "$cmd:$tail";              # Reconstruct user input.      my $userinput  = "$cmd:$tail";              # Reconstruct user input.
   
    my ($udom,$uname,$umode,$npass)=split(/:/,$tail);      my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
    chomp($npass);      &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
    &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);      if ($udom ne $currentdomainid) {
    $npass=&unescape($npass);   &Failure( $client, "not_right_domain\n", $client);
    my $proname=&propath($udom,$uname);      } else {
    my $passfilename="$proname/passwd";  
    if ($udom ne $currentdomainid) {   chomp($npass);
       Failure( $client, "not_right_domain\n", $client);  
    } else {   $npass=&unescape($npass);
       my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);   my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
       Reply($client, $result, $userinput);   my $passfilename = &password_path($udom, $uname);
    }   if ($passfilename) { # Not allowed to create a new user!!
    return 1;      # If just changing the unix passwd. need to arrange to run
       # passwd since otherwise make_passwd_file will run
       # lcuseradd which fails if an account already exists
       # (to prevent an unscrupulous LONCAPA admin from stealing
       # an existing account by overwriting it as a LonCAPA account).
   
       if(($oldauth =~/^unix/) && ($umode eq "unix")) {
    my $result = &change_unix_password($uname, $npass);
    &logthis("Result of password change for $uname: ".$result);
    if ($result eq "ok") {
       &Reply($client, \$result);
    } else {
       &Failure($client, \$result);
    }
       } else {
    my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
    #
    #  If the current auth mode is internal, and the old auth mode was
    #  unix, or krb*,  and the user is an author for this domain,
    #  re-run manage_permissions for that role in order to be able
    #  to take ownership of the construction space back to www:www
    #
   
   
    if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
       (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
       if(&is_author($udom, $uname)) {
    &Debug(" Need to manage author permissions...");
    &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
       }
    }
    &Reply($client, \$result, $userinput);
       }
          
   
    } else {       
       &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
    }
       }
       return 1;
 }  }
 RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);  &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
   
 #  #
 #   Determines if this is the home server for a user.  The home server  #   Determines if this is the home server for a user.  The home server
Line 977  RegisterHandler("changeuserauth", \&Chan Line 2003  RegisterHandler("changeuserauth", \&Chan
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 #  #
 sub IsHomeHandler {  sub is_home_handler {
    my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
    my $tail    = shift;  
    my $client  = shift;  
         
    my $userinput  = "$cmd:$tail";      my $userinput  = "$cmd:$tail";
         
    my ($udom,$uname)=split(/:/,$tail);      my ($udom,$uname)=split(/:/,$tail);
    chomp($uname);      chomp($uname);
    my $proname=propath($udom,$uname);      my $passfile = &password_filename($udom, $uname);
    if (-e $proname) {      if($passfile) {
       Reply( $client, "found\n", $userinput);   &Reply( $client, "found\n", $userinput);
    } else {      } else {
       Failure($client, "not_found\n", $userinput);   &Failure($client, "not_found\n", $userinput);
    }      }
    return 1;      return 1;
 }  }
 RegisterHandler("home", \&IsHomeHandler, 0,1,0);  &register_handler("home", \&is_home_handler, 0,1,0);
   
 #  #
 #   Process an update request for a resource?? I think what's going on here is  #   Process an update request for a resource?? I think what's going on here is
 #   that a resource has been modified that we hold a subscription to.  #   that a resource has been modified that we hold a subscription to.
Line 1017  RegisterHandler("home", \&IsHomeHandler, Line 2042  RegisterHandler("home", \&IsHomeHandler,
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 #  #
 sub UpdateResourceHandler {  sub update_resource_handler {
    my $cmd    = shift;  
    my $tail   = shift;      my ($cmd, $tail, $client) = @_;
    my $client = shift;  
         
    my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
         
    my $fname=$tail;      my $fname= $tail; # This allows interactive testing
    my $ownership=ishome($fname);  
    if ($ownership eq 'not_owner') {  
       if (-e $fname) {      my $ownership=ishome($fname);
          my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,      if ($ownership eq 'not_owner') {
              $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);   if (-e $fname) {
          my $now=time;      my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
          my $since=$now-$atime;   $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
          if ($since>$perlvar{'lonExpire'}) {      my $now=time;
             my $reply=&reply("unsub:$fname","$clientname");      my $since=$now-$atime;
             unlink("$fname");      if ($since>$perlvar{'lonExpire'}) {
          } else {   my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
             my $transname="$fname.in.transfer";   &devalidate_meta_cache($fname);
             my $remoteurl=&reply("sub:$fname","$clientname");   unlink("$fname");
             my $response;   unlink("$fname.meta");
             alarm(120);      } else {
             {   my $transname="$fname.in.transfer";
                my $ua=new LWP::UserAgent;   my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
                my $request=new HTTP::Request('GET',"$remoteurl");   my $response;
                $response=$ua->request($request,$transname);   alarm(120);
             }   {
             alarm(0);      my $ua=new LWP::UserAgent;
             if ($response->is_error()) {      my $request=new HTTP::Request('GET',"$remoteurl");
                unlink($transname);      $response=$ua->request($request,$transname);
                my $message=$response->status_line;   }
                &logthis("LWP GET: $message for $fname ($remoteurl)");   alarm(0);
             } else {   if ($response->is_error()) {
                if ($remoteurl!~/\.meta$/) {      unlink($transname);
                   alarm(120);      my $message=$response->status_line;
                   {      &logthis("LWP GET: $message for $fname ($remoteurl)");
                      my $ua=new LWP::UserAgent;   } else {
                      my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');      if ($remoteurl!~/\.meta$/) {
                      my $mresponse=$ua->request($mrequest,$fname.'.meta');   alarm(120);
                      if ($mresponse->is_error()) {   {
                         unlink($fname.'.meta');      my $ua=new LWP::UserAgent;
                      }      my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
                   }      my $mresponse=$ua->request($mrequest,$fname.'.meta');
                   alarm(0);      if ($mresponse->is_error()) {
                }   unlink($fname.'.meta');
                rename($transname,$fname);      }
             }   }
          }   alarm(0);
                Reply( $client, "ok\n", $userinput);      }
       } else {      rename($transname,$fname);
          Failure($client, "not_found\n", $userinput);      &devalidate_meta_cache($fname);
       }   }
    } else {      }
       Failure($client, "rejected\n", $userinput);      &Reply( $client, "ok\n", $userinput);
    }   } else {
    return 1;      &Failure($client, "not_found\n", $userinput);
    }
       } else {
    &Failure($client, "rejected\n", $userinput);
       }
       return 1;
   }
   &register_handler("update", \&update_resource_handler, 0 ,1, 0);
   
   sub devalidate_meta_cache {
       my ($url) = @_;
       use Cache::Memcached;
       my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
       $url = &Apache::lonnet::declutter($url);
       $url =~ s-\.meta$--;
       my $id = &escape('meta:'.$url);
       $memcache->delete($id);
 }  }
 RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);  
   
 #  #
 #   Fetch a user file from a remote server:  #   Fetch a user file from a remote server to the user's home directory
   #   userfiles subdir.
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
 #    $tail     - Tail of the command (remaining parameters).  #    $tail     - Tail of the command (remaining parameters).
Line 1087  RegisterHandler("update", \&UpdateResour Line 2127  RegisterHandler("update", \&UpdateResour
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub FetchUserFileHandler {  sub fetch_user_file_handler {
    my $cmd     = shift;  
    my $tail    = shift;      my ($cmd, $tail, $client) = @_;
    my $client  = shift;  
          my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";      my $fname           = $tail;
    my $fname           = $tail;      my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
    my ($udom,$uname,$ufile)=split(/\//,$fname);      my $udir=&propath($udom,$uname).'/userfiles';
    my $udir=propath($udom,$uname).'/userfiles';      unless (-e $udir) {
    unless (-e $udir) {   mkdir($udir,0770); 
       mkdir($udir,0770);       }
    }      Debug("fetch user file for $fname");
    if (-e $udir) {      if (-e $udir) {
       $ufile=~s/^[\.\~]+//;   $ufile=~s/^[\.\~]+//;
       $ufile=~s/\///g;  
       my $destname=$udir.'/'.$ufile;   # IF necessary, create the path right down to the file.
       my $transname=$udir.'/'.$ufile.'.in.transit';   # Note that any regular files in the way of this path are
       my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;   # wiped out to deal with some earlier folly of mine.
       my $response;  
       alarm(120);   if (!&mkpath($udir.'/'.$ufile)) {
       {      &Failure($client, "unable_to_create\n", $userinput);    
          my $ua=new LWP::UserAgent;   }
          my $request=new HTTP::Request('GET',"$remoteurl");  
          $response=$ua->request($request,$transname);   my $destname=$udir.'/'.$ufile;
       }   my $transname=$udir.'/'.$ufile.'.in.transit';
       alarm(0);   my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
       if ($response->is_error()) {   my $response;
          unlink($transname);   Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
          my $message=$response->status_line;   alarm(120);
          &logthis("LWP GET: $message for $fname ($remoteurl)");   {
          Failure($client, "failed\n", $userinput);      my $ua=new LWP::UserAgent;
       } else {      my $request=new HTTP::Request('GET',"$remoteurl");
          if (!rename($transname,$destname)) {      $response=$ua->request($request,$transname);
             &logthis("Unable to move $transname to $destname");   }
             unlink($transname);   alarm(0);
             Failure($client, "failed\n", $userinput);   if ($response->is_error()) {
          } else {      unlink($transname);
             Reply($client, "ok\n", $userinput);      my $message=$response->status_line;
          }      &logthis("LWP GET: $message for $fname ($remoteurl)");
       }         &Failure($client, "failed\n", $userinput);
    } else {   } else {
       Failure($client, "not_home\n", $userinput);      Debug("Renaming $transname to $destname");
    }      if (!rename($transname,$destname)) {
    return 1;   &logthis("Unable to move $transname to $destname");
    unlink($transname);
    &Failure($client, "failed\n", $userinput);
       } else {
    &Reply($client, "ok\n", $userinput);
       }
    }   
       } else {
    &Failure($client, "not_home\n", $userinput);
       }
       return 1;
 }  }
 RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);  &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
   
 #  #
 #   Authenticate access to a user file.  Question?   The token for athentication  #   Remove a file from a user's home directory userfiles subdirectory.
 #   is allowed to be sent as cleartext is this really what we want?  This token  # Parameters:
 #   represents the user's session id.  Once it is forged does this allow too much access??  #    cmd   - the Lond request keyword that got us here.
   #    tail  - the part of the command past the keyword.
   #    client- File descriptor connected with the client.
 #  #
   # Returns:
   #    1    - Continue processing.
   sub remove_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
   
       my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
       if ($ufile =~m|/\.\./|) {
    # any files paths with /../ in them refuse 
    # to deal with
    &Failure($client, "refused\n", "$cmd:$tail");
       } else {
    my $udir = &propath($udom,$uname);
    if (-e $udir) {
       my $file=$udir.'/userfiles/'.$ufile;
       if (-e $file) {
    #
    #   If the file is a regular file unlink is fine...
    #   However it's possible the client wants a dir.
    #   removed, in which case rmdir is more approprate:
    #
           if (-f $file){
       unlink($file);
    } elsif(-d $file) {
       rmdir($file);
    }
    if (-e $file) {
       #  File is still there after we deleted it ?!?
   
       &Failure($client, "failed\n", "$cmd:$tail");
    } else {
       &Reply($client, "ok\n", "$cmd:$tail");
    }
       } else {
    &Failure($client, "not_found\n", "$cmd:$tail");
       }
    } else {
       &Failure($client, "not_home\n", "$cmd:$tail");
    }
       }
       return 1;
   }
   &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
   
   #
   #   make a directory in a user's home directory userfiles subdirectory.
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    cmd   - the Lond request keyword that got us here.
 #    $tail     - Tail of the command (remaining parameters).  #    tail  - the part of the command past the keyword.
 #    $client   - File descriptor connected to client.  #    client- File descriptor connected with the client.
 # Returns  #
 #     0        - Requested to exit, caller should shut down.  # Returns:
 #     1        - Continue processing.  #    1    - Continue processing.
 sub AuthenticateUserFileAccess {  sub mkdir_user_file_handler {
    my $cmd   = shift;      my ($cmd, $tail, $client) = @_;
    my $tail    = shift;  
    my $client = shift;      my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
    my $userinput = "$cmd:$tail";      $dir=&unescape($dir);
       my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
    my ($fname,$session)=split(/:/,$tail);      if ($ufile =~m|/\.\./|) {
    chomp($session);   # any files paths with /../ in them refuse 
    my $reply='non_auth';   # to deal with
    if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {   &Failure($client, "refused\n", "$cmd:$tail");
       while (my $line=<ENVIN>) {      } else {
          if ($line=~/userfile\.$fname\=/) {    my $udir = &propath($udom,$uname);
             $reply='ok';    if (-e $udir) {
          }      my $newdir=$udir.'/userfiles/'.$ufile.'/';
       }      if (!&mkpath($newdir)) {
       close(ENVIN);   &Failure($client, "failed\n", "$cmd:$tail");
       Reply($client, $reply."\n", $userinput);      }
    } else {      &Reply($client, "ok\n", "$cmd:$tail");
       Failure($client, "invalid_token\n", $userinput);   } else {
    }      &Failure($client, "not_home\n", "$cmd:$tail");
    return 1;   }
          }
       return 1;
   }
   &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
   
   #
   #   rename a file in a user's home directory userfiles subdirectory.
   # Parameters:
   #    cmd   - the Lond request keyword that got us here.
   #    tail  - the part of the command past the keyword.
   #    client- File descriptor connected with the client.
   #
   # Returns:
   #    1    - Continue processing.
   sub rename_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($udom,$uname,$old,$new) = split(/:/, $tail);
       $old=&unescape($old);
       $new=&unescape($new);
       if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
    # any files paths with /../ in them refuse to deal with
    &Failure($client, "refused\n", "$cmd:$tail");
       } else {
    my $udir = &propath($udom,$uname);
    if (-e $udir) {
       my $oldfile=$udir.'/userfiles/'.$old;
       my $newfile=$udir.'/userfiles/'.$new;
       if (-e $newfile) {
    &Failure($client, "exists\n", "$cmd:$tail");
       } elsif (! -e $oldfile) {
    &Failure($client, "not_found\n", "$cmd:$tail");
       } else {
    if (!rename($oldfile,$newfile)) {
       &Failure($client, "failed\n", "$cmd:$tail");
    } else {
       &Reply($client, "ok\n", "$cmd:$tail");
    }
       }
    } else {
       &Failure($client, "not_home\n", "$cmd:$tail");
    }
       }
       return 1;
   }
   &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
   
   #
   #  Checks if the specified user has an active session on the server
   #  return ok if so, not_found if not
   #
   # Parameters:
   #   cmd      - The request keyword that dispatched to tus.
   #   tail     - The tail of the request (colon separated parameters).
   #   client   - Filehandle open on the client.
   # Return:
   #    1.
   sub user_has_session_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($udom, $uname) = map { &unescape($_) } (split(/:/, $tail));
       
       &logthis("Looking for $udom $uname");
       opendir(DIR,$perlvar{'lonIDsDir'});
       my $filename;
       while ($filename=readdir(DIR)) {
    last if ($filename=~/^\Q$uname\E_\d+_\Q$udom\E_/);
       }
       if ($filename) {
    &Reply($client, "ok\n", "$cmd:$tail");
       } else {
    &Failure($client, "not_found\n", "$cmd:$tail");
       }
       return 1;
   
 }  }
 RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);  &register_handler("userhassession", \&user_has_session_handler, 0,1,0);
   
   #
   #  Authenticate access to a user file by checking that the token the user's 
   #  passed also exists in their session file
   #
   # Parameters:
   #   cmd      - The request keyword that dispatched to tus.
   #   tail     - The tail of the request (colon separated parameters).
   #   client   - Filehandle open on the client.
   # Return:
   #    1.
   sub token_auth_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($fname, $session) = split(/:/, $tail);
       
       chomp($session);
       my $reply="non_auth";
       my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
       if (open(ENVIN,"$file")) {
    flock(ENVIN,LOCK_SH);
    tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640);
    if (exists($disk_env{"userfile.$fname"})) {
       $reply="ok";
    } else {
       foreach my $envname (keys(%disk_env)) {
    if ($envname=~ m|^userfile\.\Q$fname\E|) {
       $reply="ok";
       last;
    }
       }
    }
    untie(%disk_env);
    close(ENVIN);
    &Reply($client, \$reply, "$cmd:$tail");
       } else {
    &Failure($client, "invalid_token\n", "$cmd:$tail");
       }
       return 1;
   
   }
   &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
   
 #  #
 #   Unsubscribe from a resource.  #   Unsubscribe from a resource.
 #  #
Line 1180  RegisterHandler("tokenauthuserfile", \&A Line 2397  RegisterHandler("tokenauthuserfile", \&A
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub UnsubscribeHandler {  sub unsubscribe_handler {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;      my $userinput= "$cmd:$tail";
    my $userinput= "$cmd:$tail";      
       my ($fname) = split(/:/,$tail); # Split in case there's extrs.
    my $fname = $tail;  
    if (-e $fname) {      &Debug("Unsubscribing $fname");
       Reply($client, &unsub($client,$fname,$clientip), $userinput);      if (-e $fname) {
    } else {   &Debug("Exists");
       Failure($client, "not_found\n", $userinput);   &Reply($client, &unsub($fname,$clientip), $userinput);
    }      } else {
    return 1;   &Failure($client, "not_found\n", $userinput);
       }
       return 1;
 }  }
 RegisterHandler("unusb", \&UnsubscribeHandler, 0, 1, 0);  &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
   
 #   Subscribe to a resource.  #   Subscribe to a resource
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
Line 1206  RegisterHandler("unusb", \&UnsubscribeHa Line 2425  RegisterHandler("unusb", \&UnsubscribeHa
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub SubscribeHandler {  sub subscribe_handler {
    my $cmd        = shift;      my ($cmd, $tail, $client)= @_;
    my $tail       = shift;  
    my $client     = shift;  
    my $userinput  = "$cmd:$tail";  
   
    Reply( $client, &subscribe($userinput,$clientip), $userinput);      my $userinput  = "$cmd:$tail";
    
    return 1;      &Reply( $client, &subscribe($userinput,$clientip), $userinput);
   
       return 1;
 }  }
 RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);  &register_handler("sub", \&subscribe_handler, 0, 1, 0);
   
 #  #
 #   Determine the version of a resource (?) Or is it return  #   Determine the latest version of a resource (it looks for the highest
 #   the top version of the resource?  Not yet clear from the  #   past version and then returns that +1)
 #   code in currentversion.  
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
 #    $tail     - Tail of the command (remaining parameters).  #    $tail     - Tail of the command (remaining parameters).
   #                 (Should consist of an absolute path to a file)
 #    $client   - File descriptor connected to client.  #    $client   - File descriptor connected to client.
 # Returns  # Returns
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub CurrentVersionHandler {  sub current_version_handler {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;      my $userinput= "$cmd:$tail";
    my $userinput= "$cmd:$tail";  
         
    my $fname   = $tail;      my $fname   = $tail;
    Reply( $client, &currentversion($fname)."\n", $userinput);      &Reply( $client, &currentversion($fname)."\n", $userinput);
    return 1;      return 1;
   
 }  }
 RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);  &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
   
   
 #  Make an entry in a user's activity log.  #  Make an entry in a user's activity log.
 #  #
Line 1255  RegisterHandler("currentversion", \&Curr Line 2471  RegisterHandler("currentversion", \&Curr
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub ActivityLogEntryHandler {  sub activity_log_handler {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;  
    my $userinput= "$cmd:$tail";  
   
    my ($udom,$uname,$what)=split(/:/,$tail);  
    chomp($what);  
    my $proname=propath($udom,$uname);  
    my $now=time;  
    my $hfh;  
    if ($hfh=IO::File->new(">>$proname/activity.log")) {   
       print $hfh "$now:$clientname:$what\n";  
       Reply( $client, "ok\n", $userinput);   
    } else {  
       Reply($client, "error: ".($!+0)." IO::File->new Failed "  
             ."while attempting log\n",   
             $userinput);  
    }  
   
    return 1;  
       my $userinput= "$cmd:$tail";
   
       my ($udom,$uname,$what)=split(/:/,$tail);
       chomp($what);
       my $proname=&propath($udom,$uname);
       my $now=time;
       my $hfh;
       if ($hfh=IO::File->new(">>$proname/activity.log")) { 
    print $hfh "$now:$clientname:$what\n";
    &Reply( $client, "ok\n", $userinput); 
       } else {
    &Failure($client, "error: ".($!+0)." IO::File->new Failed "
    ."while attempting log\n", 
    $userinput);
       }
   
       return 1;
 }  }
 RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);  &register_handler("log", \&activity_log_handler, 0, 1, 0);
   
 #  #
 #   Put a namespace entry in a user profile hash.  #   Put a namespace entry in a user profile hash.
 #   My druthers would be for this to be an encrypted interaction too.  #   My druthers would be for this to be an encrypted interaction too.
Line 1292  RegisterHandler("log", \&ActivityLogEntr Line 2509  RegisterHandler("log", \&ActivityLogEntr
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub PutUserProfileEntry {  sub put_user_profile_entry {
    my $cmd       = shift;      my ($cmd, $tail, $client)  = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";      
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
    my ($udom,$uname,$namespace,$what) =split(/:/,$tail);      if ($namespace ne 'roles') {
    $namespace=~s/\//\_/g;   chomp($what);
    $namespace=~s/\W//g;   my $hashref = &tie_user_hash($udom, $uname, $namespace,
    if ($namespace ne 'roles') {    &GDBM_WRCREAT(),"P",$what);
       chomp($what);   if($hashref) {
       my $proname=propath($udom,$uname);      my @pairs=split(/\&/,$what);
       my $now=time;      foreach my $pair (@pairs) {
       unless ($namespace=~/^nohist\_/) {   my ($key,$value)=split(/=/,$pair);
          my $hfh;   $hashref->{$key}=$value;
          if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {       }
             print $hfh "P:$now:$what\n";       if (&untie_user_hash($hashref)) {
          }   &Reply( $client, "ok\n", $userinput);
       }      } else {
       my @pairs=split(/\&/,$what);   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
       my %hash;   "while attempting put\n", 
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",   $userinput);
                   &GDBM_WRCREAT(),0640)) {      }
          foreach my $pair (@pairs) {   } else {
             my ($key,$value)=split(/=/,$pair);      &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
             $hash{$key}=$value;       "while attempting put\n", $userinput);
          }   }
          if (untie(%hash)) {      } else {
             Reply( $client, "ok\n", $userinput);          &Failure( $client, "refused\n", $userinput);
          } else {      }
             Failure($client, "error: ".($!+0)." untie(GDBM) failed ".      
                   "while attempting put\n",       return 1;
                   $userinput);  }
          }  &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
       } else {  
          Failure( $client, "error: ".($!)." tie(GDBM) Failed ".  #   Put a piece of new data in hash, returns error if entry already exists
          "while attempting put\n", $userinput);  # Parameters:
       }  #    $cmd      - The command that got us here.
    } else {  #    $tail     - Tail of the command (remaining parameters).
       Failure( $client, "refused\n", $userinput);  #    $client   - File descriptor connected to client.
    }  # Returns
      #     0        - Requested to exit, caller should shut down.
    return 1;  #     1        - Continue processing.
   #
   sub newput_user_profile_entry {
       my ($cmd, $tail, $client)  = @_;
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
       if ($namespace eq 'roles') {
           &Failure( $client, "refused\n", $userinput);
    return 1;
       }
   
       chomp($what);
   
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_WRCREAT(),"N",$what);
       if(!$hashref) {
    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
     "while attempting put\n", $userinput);
    return 1;
       }
   
       my @pairs=split(/\&/,$what);
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    if (exists($hashref->{$key})) {
       &Failure($client, "key_exists: ".$key."\n",$userinput);
       return 1;
    }
       }
   
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $hashref->{$key}=$value;
       }
   
       if (&untie_user_hash($hashref)) {
    &Reply( $client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
    "while attempting put\n", 
    $userinput);
       }
       return 1;
 }  }
 RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);  &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
   
 #   # 
 #   Increment a profile entry in the user history file.  #   Increment a profile entry in the user history file.
Line 1353  RegisterHandler("put", \&PutUserProfileE Line 2614  RegisterHandler("put", \&PutUserProfileE
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub IncrementUserValueHandler {  sub increment_user_value_handler {
    my $cmd         = shift;      my ($cmd, $tail, $client) = @_;
    my $tail        = shift;      
    my $client      = shift;      my $userinput   = "$cmd:$tail";
    my $userinput   = shift;      
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
    my ($udom,$uname,$namespace,$what) =split(/:/,$tail);      if ($namespace ne 'roles') {
    $namespace=~s/\//\_/g;          chomp($what);
    $namespace=~s/\W//g;   my $hashref = &tie_user_hash($udom, $uname,
    if ($namespace ne 'roles') {       $namespace, &GDBM_WRCREAT(),
       chomp($what);       "P",$what);
       my $proname=propath($udom,$uname);   if ($hashref) {
       my $now=time;      my @pairs=split(/\&/,$what);
       unless ($namespace=~/^nohist\_/) {      foreach my $pair (@pairs) {
          my $hfh;   my ($key,$value)=split(/=/,$pair);
          if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {                   $value = &unescape($value);
             print $hfh "P:$now:$what\n";   # We could check that we have a number...
          }   if (! defined($value) || $value eq '') {
       }      $value = 1;
       my @pairs=split(/\&/,$what);   }
       my %hash;   $hashref->{$key}+=$value;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),                  if ($namespace eq 'nohist_resourcetracker') {
                0640)) {                      if ($hashref->{$key} < 0) {
          foreach my $pair (@pairs) {                          $hashref->{$key} = 0;
             my ($key,$value)=split(/=/,$pair);                      }
             # We could check that we have a number...                  }
             if (! defined($value) || $value eq '') {      }
                $value = 1;      if (&untie_user_hash($hashref)) {
             }   &Reply( $client, "ok\n", $userinput);
             $hash{$key}+=$value;      } else {
          }   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
          if (untie(%hash)) {   "while attempting inc\n", $userinput);
             Reply( $client, "ok\n", $userinput);      }
          } else {   } else {
             Failure($client, "error: ".($!+0)." untie(GDBM) failed ".      &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                      "while attempting put\n", $userinput);       "while attempting inc\n", $userinput);
          }   }
       } else {      } else {
          Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "refused\n", $userinput);
                   "while attempting put\n", $userinput);      }
       }      
    } else {      return 1;
       Failure($client, "refused\n", $userinput);  
    }  
   
    return 1;  
 }  }
 RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0);  &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
   
 #  #
 #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.  #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
 #   Each 'role' a user has implies a set of permissions.  Adding a new role  #   Each 'role' a user has implies a set of permissions.  Adding a new role
Line 1421  RegisterHandler("inc", \&IncrementUserVa Line 2679  RegisterHandler("inc", \&IncrementUserVa
 #     1         - To continue processing.  #     1         - To continue processing.
 #  #
 #  #
 sub RolesPutHandler {  sub roles_put_handler {
    my $cmd        = shift;      my ($cmd, $tail, $client) = @_;
    my $tail       = shift;  
    my $client     = shift;      my $userinput  = "$cmd:$tail";
    my $userinput  = "$cmd:$tail";  
          my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
    my ($exedom,$exeuser,$udom,$uname,$what)   =split(/:/,$tail);      
    &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.  
           "what = ".$what);      my $namespace='roles';
    my $namespace='roles';      chomp($what);
    chomp($what);      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    my $proname=propath($udom,$uname);   &GDBM_WRCREAT(), "P",
    my $now=time;   "$exedom:$exeuser:$what");
    #      #
    #  Log the attempt to set a role.  The {}'s here ensure that the file       #  Log the attempt to set a role.  The {}'s here ensure that the file 
    #  handle is open for the minimal amount of time.  Since the flush      #  handle is open for the minimal amount of time.  Since the flush
    #  is done on close this improves the chances the log will be an un-      #  is done on close this improves the chances the log will be an un-
    #  corrupted ordered thing.      #  corrupted ordered thing.
    {      if ($hashref) {
       my $hfh;   my $pass_entry = &get_auth_type($udom, $uname);
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {    my ($auth_type,$pwd)  = split(/:/, $pass_entry);
          print $hfh "P:$now:$exedom:$exeuser:$what\n";   $auth_type = $auth_type.":";
       }   my @pairs=split(/\&/,$what);
    }   foreach my $pair (@pairs) {
    my @pairs=split(/\&/,$what);      my ($key,$value)=split(/=/,$pair);
    my %hash;      &manage_permissions($key, $udom, $uname,
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {         $auth_type);
       foreach my $pair (@pairs) {      $hashref->{$key}=$value;
          my ($key,$value)=split(/=/,$pair);   }
             &ManagePermissions($key, $udom, $uname,   if (&untie_user_hash($hashref)) {
                                &GetAuthType( $udom, $uname));      &Reply($client, "ok\n", $userinput);
             $hash{$key}=$value;   } else {
       }      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
       if (untie(%hash)) {       "while attempting rolesput\n", $userinput);
          Reply($client, "ok\n", $userinput);   }
       } else {      } else {
          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                          "while attempting rolesput\n", $userinput);   "while attempting rolesput\n", $userinput);
       }      }
    } else {      return 1;
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
                         "while attempting rolesput\n", $userinput);  
    }  
    return 1;  
 }  }
 RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0);  # Encoded client only.  &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
   
 #  #
 #   Deletes (removes) a role for a user.   This is equivalent to removing  #   Deletes (removes) a role for a user.   This is equivalent to removing
 #  a permissions package associated with the role from the user's profile.  #  a permissions package associated with the role from the user's profile.
Line 1484  RegisterHandler("rolesput", \&RolesPutHa Line 2739  RegisterHandler("rolesput", \&RolesPutHa
 #     1                    - Continue processing  #     1                    - Continue processing
 #     0                    - Exit.  #     0                    - Exit.
 #  #
 sub RolesDeleteHandler {  sub roles_delete_handler {
    my $cmd          = shift;      my ($cmd, $tail, $client)  = @_;
    my $tail         = shift;  
    my $client       = shift;  
    my $userinput    = "$cmd:$tail";  
      
    my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);  
    &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.  
           "what = ".$what);  
    my $namespace='roles';  
    chomp($what);  
    my $proname=propath($udom,$uname);  
    my $now=time;  
    #  
    #   Log the attempt. This {}'ing is done to ensure that the  
    #   logfile is flushed and closed as quickly as possible.  Hopefully  
    #   this preserves both time ordering and reduces the probability that  
    #   messages will be interleaved.  
    #  
    {  
       my $hfh;  
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {   
          print $hfh "D:$now:$exedom:$exeuser:$what\n";  
       }  
    }  
    my @rolekeys=split(/\&/,$what);  
    my %hash;  
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {  
       foreach my $key (@rolekeys) {  
          delete $hash{$key};  
       }  
       if (untie(%hash)) {  
          Reply($client, "ok\n", $userinput);  
       } else {  
          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".  
                            "while attempting rolesdel\n", $userinput);  
       }  
    } else {  
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
                         "while attempting rolesdel\n", $userinput);  
    }  
   
    return 1;      my $userinput    = "$cmd:$tail";
      
       my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
       &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
      "what = ".$what);
       my $namespace='roles';
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_WRCREAT(), "D",
    "$exedom:$exeuser:$what");
       
       if ($hashref) {
    my @rolekeys=split(/\&/,$what);
   
    foreach my $key (@rolekeys) {
       delete $hashref->{$key};
    }
    if (&untie_user_hash($hashref)) {
       &Reply($client, "ok\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting rolesdel\n", $userinput);
    }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting rolesdel\n", $userinput);
       }
       
       return 1;
 }  }
 RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only  &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
   
 # Unencrypted get from a user's profile database.  See   # Unencrypted get from a user's profile database.  See 
 # GetProfileEntryEncrypted for a version that does end-to-end encryption.  # GetProfileEntryEncrypted for a version that does end-to-end encryption.
Line 1549  RegisterHandler("rolesdel", \&RolesDelet Line 2793  RegisterHandler("rolesdel", \&RolesDelet
 #   1       - Continue processing.  #   1       - Continue processing.
 #   0       - Exit.  #   0       - Exit.
 #  #
 sub GetProfileEntry {  sub get_profile_entry {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;      my $userinput= "$cmd:$tail";
    my $userinput= "$cmd:$tail";  
         
    my ($udom,$uname,$namespace,$what) = split(/:/,$tail);      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
    $namespace=~s/\//\_/g;      chomp($what);
    $namespace=~s/\W//g;  
    chomp($what);  
    my @queries=split(/\&/,$what);      my $replystring = read_profile($udom, $uname, $namespace, $what);
    my $proname=propath($udom,$uname);      my ($first) = split(/:/,$replystring);
    my $qresult='';      if($first ne "error") {
    my %hash;   &Reply($client, \$replystring, $userinput);
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {      } else {
       for (my $i=0;$i<=$#queries;$i++) {   &Failure($client, $replystring." while attempting get\n", $userinput);
          $qresult.="$hash{$queries[$i]}&";    # Presumably failure gives empty string.      }
       }      return 1;
       if (untie(%hash)) {  
          $qresult=~s/\&$//;              # Remove trailing & from last lookup.  
          Reply($client, "$qresult\n", $userinput);  
       } else {  
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
                           "while attempting get\n", $userinput);  
       }  
    } else {  
       if ($!+0 == 2) {                # +0 coerces errno -> number 2 is ENOENT  
          Failure($client, "error:No such file or ".  
                           "GDBM reported bad block error\n", $userinput);  
       } else {                        # Some other undifferentiated err.  
          Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
                            "while attempting get\n", $userinput);  
       }  
    }  
    return 1;  
 }  }
 RegisterHandler("get", \&GetProfileEntry, 0,1,0);  &register_handler("get", \&get_profile_entry, 0,1,0);
   
 #  #
 #  Process the encrypted get request.  Note that the request is sent  #  Process the encrypted get request.  Note that the request is sent
 #  in clear, but the reply is encrypted.  This is a small covert channel:  #  in clear, but the reply is encrypted.  This is a small covert channel:
Line 1605  RegisterHandler("get", \&GetProfileEntry Line 2834  RegisterHandler("get", \&GetProfileEntry
 #  Returns:  #  Returns:
 #     1      - Continue processing  #     1      - Continue processing
 #     0      - server should exit.  #     0      - server should exit.
 sub GetProfileEntryEncrypted {  sub get_profile_entry_encrypted {
    my $cmd       = shift;      my ($cmd, $tail, $client) = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";  
         
    my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
    $namespace=~s/\//\_/g;      chomp($what);
    $namespace=~s/\W//g;      my $qresult = read_profile($udom, $uname, $namespace, $what);
    chomp($what);      my ($first) = split(/:/, $qresult);
    my @queries=split(/\&/,$what);      if($first ne "error") {
    my $proname=propath($udom,$uname);  
    my $qresult='';   if ($cipher) {
    my %hash;      my $cmdlength=length($qresult);
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {      $qresult.="         ";
       for (my $i=0;$i<=$#queries;$i++) {      my $encqresult='';
          $qresult.="$hash{$queries[$i]}&";      for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
       }   $encqresult.= unpack("H16", 
       if (untie(%hash)) {       $cipher->encrypt(substr($qresult,
          $qresult=~s/\&$//;       $encidx,
          if ($cipher) {       8)));
             my $cmdlength=length($qresult);      }
             $qresult.="         ";      &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
             my $encqresult='';   } else {
             for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {   &Failure( $client, "error:no_key\n", $userinput);
                $encqresult.= unpack("H16", $cipher->encrypt(substr($qresult,      }
                                                                    $encidx,      } else {
                                                                    8)));   &Failure($client, "$qresult while attempting eget\n", $userinput);
             }  
             Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);      }
          } else {      
             Failure( $client, "error:no_key\n", $userinput);      return 1;
          }  
       } else {  
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
                               "while attempting eget\n", $userinput);  
       }  
    } else {  
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
                        "while attempting eget\n", $userinput);  
    }  
            
    return 1;  
 }  }
 RegisterHandler("eget", \&GetProfileEncrypted, 0, 1, 0);  &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
   
 #  #
 #   Deletes a key in a user profile database.  #   Deletes a key in a user profile database.
Line 1669  RegisterHandler("eget", \&GetProfileEncr Line 2886  RegisterHandler("eget", \&GetProfileEncr
 #     0   - Exit server.  #     0   - Exit server.
 #  #
 #  #
 sub DeletProfileEntry {  sub delete_profile_entry {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;      my $userinput = "cmd:$tail";
    my $userinput = "cmd:$tail";  
       my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
    my ($udom,$uname,$namespace,$what) = split(/:/,$tail);      chomp($what);
    $namespace=~s/\//\_/g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    $namespace=~s/\W//g;   &GDBM_WRCREAT(),
    chomp($what);   "D",$what);
    my $proname=propath($udom,$uname);      if ($hashref) {
    my $now=time;          my @keys=split(/\&/,$what);
    unless ($namespace=~/^nohist\_/) {   foreach my $key (@keys) {
       my $hfh;      delete($hashref->{$key});
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {    }
          print $hfh "D:$now:$what\n";    if (&untie_user_hash($hashref)) {
       }      &Reply($client, "ok\n", $userinput);
    }   } else {
    my @keys=split(/\&/,$what);      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    my %hash;      "while attempting del\n", $userinput);
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {   }
       foreach my $key (@keys) {      } else {
          delete($hash{$key});   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
       }   "while attempting del\n", $userinput);
       if (untie(%hash)) {      }
          Reply($client, "ok\n", $userinput);      return 1;
       } else {  
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
                            "while attempting del\n", $userinput);  
       }  
    } else {  
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
                         "while attempting del\n", $userinput);  
    }  
    return 1;  
 }  }
 RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0);  &register_handler("del", \&delete_profile_entry, 0, 1, 0);
   
 #  #
 #  List the set of keys that are defined in a profile database file.  #  List the set of keys that are defined in a profile database file.
 #  A successful reply from this will contain an & separated list of  #  A successful reply from this will contain an & separated list of
Line 1721  RegisterHandler("del", \&DeleteProfileEn Line 2930  RegisterHandler("del", \&DeleteProfileEn
 #    1    - Continue processing.  #    1    - Continue processing.
 #    0    - Exit the server.  #    0    - Exit the server.
 #  #
 sub GetProfileKeys {  sub get_profile_keys {
    my $cmd       = shift;      my ($cmd, $tail, $client) = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";  
       my ($udom,$uname,$namespace)=split(/:/,$tail);
    my ($udom,$uname,$namespace)=split(/:/,$tail);      my $qresult='';
    $namespace=~s/\//\_/g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    $namespace=~s/\W//g;    &GDBM_READER());
    my $proname=propath($udom,$uname);      if ($hashref) {
    my $qresult='';   foreach my $key (keys %$hashref) {
    my %hash;      $qresult.="$key&";
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {   }
       foreach my $key (keys %hash) {   if (&untie_user_hash($hashref)) {
           $qresult.="$key&";      $qresult=~s/\&$//;
       }      &Reply($client, \$qresult, $userinput);
       if (untie(%hash)) {   } else {
          $qresult=~s/\&$//;      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
          Reply($client, "$qresult\n", $userinput);      "while attempting keys\n", $userinput);
       } else {   }
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      } else {
                           "while attempting keys\n", $userinput);   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
       }   "while attempting keys\n", $userinput);
    } else {      }
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
                         "while attempting keys\n", $userinput);  
    }  
         
    return 1;      return 1;
 }  }
 RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);  &register_handler("keys", \&get_profile_keys, 0, 1, 0);
   
 #  #
 #   Dump the contents of a user profile database.  #   Dump the contents of a user profile database.
 #   Note that this constitutes a very large covert channel too since  #   Note that this constitutes a very large covert channel too since
Line 1771  RegisterHandler("keys", \&GetProfileKeys Line 2978  RegisterHandler("keys", \&GetProfileKeys
 #     1    - Continue processing.  #     1    - Continue processing.
 #     0    - Exit the server.  #     0    - Exit the server.
 #  #
 sub DumpProfileDatabase {  sub dump_profile_database {
    my $cmd       = shift;      my ($cmd, $tail, $client) = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";  
         
    my ($udom,$uname,$namespace) = split(/:/,$tail);      my ($udom,$uname,$namespace) = split(/:/,$tail);
    $namespace=~s/\//\_/g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    $namespace=~s/\W//g;   &GDBM_READER());
    my $qresult='';      if ($hashref) {
    my $proname=propath($udom,$uname);   # Structure of %data:
    my %hash;   # $data{$symb}->{$parameter}=$value;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {   # $data{$symb}->{'v.'.$parameter}=$version;
       # Structure of %data:   # since $parameter will be unescaped, we do not
       # $data{$symb}->{$parameter}=$value;    # have to worry about silly parameter names...
       # $data{$symb}->{'v.'.$parameter}=$version;  
       # since $parameter will be unescaped, we do not          my $qresult='';
       # have to worry about silly parameter names...   my %data = ();                     # A hash of anonymous hashes..
       my %data = ();                     # A hash of anonymous hashes..   while (my ($key,$value) = each(%$hashref)) {
       while (my ($key,$value) = each(%hash)) {      my ($v,$symb,$param) = split(/:/,$key);
          my ($v,$symb,$param) = split(/:/,$key);      next if ($v eq 'version' || $symb eq 'keys');
          next if ($v eq 'version' || $symb eq 'keys');      next if (exists($data{$symb}) && 
          next if (exists($data{$symb}) &&        exists($data{$symb}->{$param}) &&
                   exists($data{$symb}->{$param}) &&       $data{$symb}->{'v.'.$param} > $v);
                   $data{$symb}->{'v.'.$param} > $v);      $data{$symb}->{$param}=$value;
          $data{$symb}->{$param}=$value;      $data{$symb}->{'v.'.$param}=$v;
          $data{$symb}->{'v.'.$param}=$v;   }
       }   if (&untie_user_hash($hashref)) {
       if (untie(%hash)) {      while (my ($symb,$param_hash) = each(%data)) {
          while (my ($symb,$param_hash) = each(%data)) {   while(my ($param,$value) = each (%$param_hash)){
             while(my ($param,$value) = each (%$param_hash)){      next if ($param =~ /^v\./);       # Ignore versions...
                next if ($param =~ /^v\./);       # Ignore versions...      #
                #      #   Just dump the symb=value pairs separated by &
                #   Just dump the symb=value pairs separated by &      #
                #      $qresult.=$symb.':'.$param.'='.$value.'&';
                $qresult.=$symb.':'.$param.'='.$value.'&';   }
             }      }
          }      chop($qresult);
          chop($qresult);      &Reply($client , \$qresult, $userinput);
          Reply($client , "$qresult\n", $userinput);   } else {
       } else {      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".       "while attempting currentdump\n", $userinput);
                            "while attempting currentdump\n", $userinput);   }
       }      } else {
    } else {   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   "while attempting currentdump\n", $userinput);
                         "while attempting currentdump\n", $userinput);      }
    }  
   
    return 1;      return 1;
 }  }
 RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);  &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
   
 #  #
 #   Dump a profile database with an optional regular expression  #   Dump a profile database with an optional regular expression
 #   to match against the keys.  In this dump, no effort is made  #   to match against the keys.  In this dump, no effort is made
Line 1847  RegisterHandler("currentdump", \&DumpPro Line 3053  RegisterHandler("currentdump", \&DumpPro
 # Side effects:  # Side effects:
 #    response is written to $client.  #    response is written to $client.
 #  #
 sub DumpWithRegexp {  sub dump_with_regexp {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
       my $userinput = "$cmd:$tail";
   my $userinput = "$cmd:$tail";  
       my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
   my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);      if (defined($regexp)) {
   $namespace=~s/\//\_/g;   $regexp=&unescape($regexp);
   $namespace=~s/\W//g;      } else {
   if (defined($regexp)) {   $regexp='.';
     $regexp=&unescape($regexp);      }
   } else {      my ($start,$end);
     $regexp='.';      if (defined($range)) {
   }   if ($range =~/^(\d+)\-(\d+)$/) {
   my $qresult='';      ($start,$end) = ($1,$2);
   my $proname=propath($udom,$uname);   } elsif ($range =~/^(\d+)$/) {
   my %hash;      ($start,$end) = (0,$1);
   if (tie(%hash,'GDBM_File',"$proname/$namespace.db",   } else {
   &GDBM_READER(),0640)) {      undef($range);
     study($regexp);  
     while (my ($key,$value) = each(%hash)) {  
       if ($regexp eq '.') {  
  $qresult.=$key.'='.$value.'&';  
       } else {  
  my $unescapeKey = &unescape($key);  
  if (eval('$unescapeKey=~/$regexp/')) {  
   $qresult.="$key=$value&";  
  }   }
       }  
     }      }
     if (untie(%hash)) {      my $hashref = &tie_user_hash($udom, $uname, $namespace,
       chop($qresult);   &GDBM_READER());
       Reply($client, "$qresult\n", $userinput);      if ($hashref) {
           my $qresult='';
    my $count=0;
    while (my ($key,$value) = each(%$hashref)) {
       if ($regexp eq '.') {
    $count++;
    if (defined($range) && $count >= $end)   { last; }
    if (defined($range) && $count <  $start) { next; }
    $qresult.=$key.'='.$value.'&';
       } else {
    my $unescapeKey = &unescape($key);
    if (eval('$unescapeKey=~/$regexp/')) {
       $count++;
       if (defined($range) && $count >= $end)   { last; }
       if (defined($range) && $count <  $start) { next; }
       $qresult.="$key=$value&";
    }
       }
    }
    if (&untie_user_hash($hashref)) {
       chop($qresult);
       &Reply($client, \$qresult, $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting dump\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting dump\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
   
   #  Store a set of key=value pairs associated with a versioned name.
   #
   #  Parameters:
   #    $cmd                - Request command keyword.
   #    $tail               - Tail of the request.  This is a colon
   #                          separated list containing:
   #                          domain/user - User and authentication domain.
   #                          namespace   - Name of the database being modified
   #                          rid         - Resource keyword to modify.
   #                          what        - new value associated with rid.
   #
   #    $client             - Socket open on the client.
   #
   #
   #  Returns:
   #      1 (keep on processing).
   #  Side-Effects:
   #    Writes to the client
   sub store_handler {
       my ($cmd, $tail, $client) = @_;
    
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
       if ($namespace ne 'roles') {
   
    chomp($what);
    my @pairs=split(/\&/,$what);
    my $hashref  = &tie_user_hash($udom, $uname, $namespace,
          &GDBM_WRCREAT(), "S",
          "$rid:$what");
    if ($hashref) {
       my $now = time;
       my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
       my $key;
       $hashref->{"version:$rid"}++;
       my $version=$hashref->{"version:$rid"};
       my $allkeys=''; 
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $allkeys.=$key.':';
    $hashref->{"$version:$rid:$key"}=$value;
       }
       $hashref->{"$version:$rid:timestamp"}=$now;
       $allkeys.='timestamp';
       $hashref->{"$version:keys:$rid"}=$allkeys;
       if (&untie_user_hash($hashref)) {
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    "while attempting store\n", $userinput);
       }
    } else {
       &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting store\n", $userinput);
    }
     } else {      } else {
       Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure($client, "refused\n", $userinput);
        "while attempting dump\n", $userinput);  
     }      }
   } else {  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
     "while attempting dump\n", $userinput);  
   }  
   
     return 1;      return 1;
 }  }
 RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);  &register_handler("store", \&store_handler, 0, 1, 0);
   
 #  Store an aitem in any database but the roles database.  #  Modify a set of key=value pairs associated with a versioned name.
 #  #
 #  Parameters:  #  Parameters:
 #    $cmd                - Request command keyword.  #    $cmd                - Request command keyword.
Line 1903  RegisterHandler("dump", \&DumpWithRegexp Line 3185  RegisterHandler("dump", \&DumpWithRegexp
 #                          domain/user - User and authentication domain.  #                          domain/user - User and authentication domain.
 #                          namespace   - Name of the database being modified  #                          namespace   - Name of the database being modified
 #                          rid         - Resource keyword to modify.  #                          rid         - Resource keyword to modify.
   #                          v           - Version item to modify
 #                          what        - new value associated with rid.  #                          what        - new value associated with rid.
 #  #
 #    $client             - Socket open on the client.  #    $client             - Socket open on the client.
Line 1912  RegisterHandler("dump", \&DumpWithRegexp Line 3195  RegisterHandler("dump", \&DumpWithRegexp
 #      1 (keep on processing).  #      1 (keep on processing).
 #  Side-Effects:  #  Side-Effects:
 #    Writes to the client  #    Writes to the client
 sub StoreHandler {  sub putstore_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
     
   my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
   
   my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);      my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
   $namespace=~s/\//\_/g;      if ($namespace ne 'roles') {
   $namespace=~s/\W//g;  
   if ($namespace ne 'roles') {   chomp($what);
     chomp($what);   my $hashref  = &tie_user_hash($udom, $uname, $namespace,
     my $proname=propath($udom,$uname);         &GDBM_WRCREAT(), "M",
     my $now=time;         "$rid:$v:$what");
     unless ($namespace=~/^nohist\_/) {   if ($hashref) {
       my $hfh;      my $now = time;
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {      my %data = &hash_extract($what);
  print $hfh "P:$now:$rid:$what\n";       my @allkeys;
       }      while (my($key,$value) = each(%data)) {
    push(@allkeys,$key);
    $hashref->{"$v:$rid:$key"} = $value;
       }
       my $allkeys = join(':',@allkeys);
       $hashref->{"$v:keys:$rid"}=$allkeys;
   
       if (&untie_user_hash($hashref)) {
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    "while attempting store\n", $userinput);
       }
    } else {
       &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting store\n", $userinput);
    }
       } else {
    &Failure($client, "refused\n", $userinput);
     }      }
     my @pairs=split(/\&/,$what);  
       return 1;
   }
   &register_handler("putstore", \&putstore_handler, 0, 1, 0);
   
   sub hash_extract {
       my ($str)=@_;
     my %hash;      my %hash;
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",      foreach my $pair (split(/\&/,$str)) {
     &GDBM_WRCREAT(),0640)) {  
       my @previouskeys=split(/&/,$hash{"keys:$rid"});  
       my $key;  
       $hash{"version:$rid"}++;  
       my $version=$hash{"version:$rid"};  
       my $allkeys='';   
       foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);   my ($key,$value)=split(/=/,$pair);
  $allkeys.=$key.':';   $hash{$key}=$value;
  $hash{"$version:$rid:$key"}=$value;  
       }  
       $hash{"$version:$rid:timestamp"}=$now;  
       $allkeys.='timestamp';  
       $hash{"$version:keys:$rid"}=$allkeys;  
       if (untie(%hash)) {  
  Reply($client, "ok\n", $userinput);  
       } else {  
  Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
  "while attempting store\n", $userinput);  
       }  
     } else {  
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
        "while attempting store\n", $userinput);  
     }      }
   } else {      return (%hash);
     Failure($client, "refused\n", $userinput);  }
   }  sub hash_to_str {
       my ($hash_ref)=@_;
   return 1;      my $str;
       foreach my $key (keys(%$hash_ref)) {
    $str.=$key.'='.$hash_ref->{$key}.'&';
       }
       $str=~s/\&$//;
       return $str;
 }  }
 RegisterHandler("store", \&StoreHandler, 0, 1, 0);  
 #  #
 #   Restore a prior version of a resource.  #  Dump out all versions of a resource that has key=value pairs associated
   # with it for each version.  These resources are built up via the store
   # command.
 #  #
 #  Parameters:  #  Parameters:
 #     $cmd               - Command keyword.  #     $cmd               - Command keyword.
Line 1981  RegisterHandler("store", \&StoreHandler, Line 3272  RegisterHandler("store", \&StoreHandler,
 #      1  indicating the caller should not yet exit.  #      1  indicating the caller should not yet exit.
 # Side-effects:  # Side-effects:
 #   Writes a reply to the client.  #   Writes a reply to the client.
 #  #   The reply is a string of the following shape:
 sub RestoreHandler {  #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
   my $cmd     = shift;  #    Where the 1 above represents version 1.
   my $tail    = shift;  #    this continues for all pairs of keys in all versions.
   my $client  = shift;  #
   #
   my $userinput = "$cmd:$tail"; # Only used for logging purposes.  #    
   #
   my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);  sub restore_handler {
   $namespace=~s/\//\_/g;      my ($cmd, $tail, $client) = @_;
   $namespace=~s/\W//g;  
   chomp($rid);      my $userinput = "$cmd:$tail"; # Only used for logging purposes.
   my $proname=propath($udom,$uname);      my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
   my $qresult='';      $namespace=~s/\//\_/g;
   my %hash;      $namespace = &LONCAPA::clean_username($namespace);
   if (tie(%hash,'GDBM_File',"$proname/$namespace.db",  
   &GDBM_READER(),0640)) {      chomp($rid);
     my $version=$hash{"version:$rid"};      my $qresult='';
     $qresult.="version=$version&";      my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
     my $scope;      if ($hashref) {
     for ($scope=1;$scope<=$version;$scope++) {   my $version=$hashref->{"version:$rid"};
       my $vkeys=$hash{"$scope:keys:$rid"};   $qresult.="version=$version&";
  my @keys=split(/:/,$vkeys);   my $scope;
       my $key;   for ($scope=1;$scope<=$version;$scope++) {
       $qresult.="$scope:keys=$vkeys&";      my $vkeys=$hashref->{"$scope:keys:$rid"};
       foreach $key (@keys) {      my @keys=split(/:/,$vkeys);
  $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";      my $key;
       }                                        $qresult.="$scope:keys=$vkeys&";
     }      foreach $key (@keys) {
      if (untie(%hash)) {   $qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
        $qresult=~s/\&$//;      }                                  
        Reply( $client, "$qresult\n", $userinput);   }
      } else {   if (&untie_user_hash($hashref)) {
        Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      $qresult=~s/\&$//;
        "while attempting restore\n", $userinput);      &Reply( $client, \$qresult, $userinput);
      }   } else {
   } else {      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      "while attempting restore\n", $userinput);
     "while attempting restore\n", $userinput);   }
   }      } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting restore\n", $userinput);
       }
       
   return 1;      return 1;
   
   
 }  }
 RegisterHandler("restor", \&RestoreHandler, 0,1,0);  &register_handler("restore", \&restore_handler, 0,1,0);
   
 #  #
 #   Add a chat message to to a discussion board.  #   Add a chat message to a synchronous discussion board.
 #  #
 # Parameters:  # Parameters:
 #    $cmd                - Request keyword.  #    $cmd                - Request keyword.
 #    $tail               - Tail of the command. A colon separated list  #    $tail               - Tail of the command. A colon separated list
 #                          containing:  #                          containing:
 #                          cdom    - Domain on which the chat board lives  #                          cdom    - Domain on which the chat board lives
 #                          cnum    - Identifier of the discussion group.  #                          cnum    - Course containing the chat board.
 #                          post    - Body of the posting.  #                          newpost - Body of the posting.
   #                          group   - Optional group, if chat board is only 
   #                                    accessible in a group within the course 
 #   $client              - Socket open on the client.  #   $client              - Socket open on the client.
 # Returns:  # Returns:
 #   1    - Indicating caller should keep on processing.  #   1    - Indicating caller should keep on processing.
Line 2046  RegisterHandler("restor", \&RestoreHandl Line 3342  RegisterHandler("restor", \&RestoreHandl
 #   writes a reply to the client.  #   writes a reply to the client.
 #  #
 #  #
 sub SendChatHandler {  sub send_chat_handler {
   my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
   my $tail    = shift;  
   my $client  = shift;  
   
   my $userinput = "$cmd:$tail";      
       my $userinput = "$cmd:$tail";
   
   my ($cdom,$cnum,$newpost)=split(/\:/,$tail);      my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
   &chatadd($cdom,$cnum,$newpost);      &chat_add($cdom,$cnum,$newpost,$group);
   Reply($client, "ok\n", $userinput);      &Reply($client, "ok\n", $userinput);
   
   return 1;      return 1;
 }  }
 RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);  &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
   
 #  #
 #   Retrieve the set of chat messagss from a discussion board.  #   Retrieve the set of chat messages from a discussion board.
 #  #
 #  Parameters:  #  Parameters:
 #    $cmd             - Command keyword that initiated the request.  #    $cmd             - Command keyword that initiated the request.
Line 2071  RegisterHandler("chatsend", \&SendChatHa Line 3367  RegisterHandler("chatsend", \&SendChatHa
 #                       chat id        - Discussion thread(?)  #                       chat id        - Discussion thread(?)
 #                       domain/user    - Authentication domain and username  #                       domain/user    - Authentication domain and username
 #                                        of the requesting person.  #                                        of the requesting person.
   #                       group          - Optional course group containing
   #                                        the board.      
 #   $client           - Socket open on the client program.  #   $client           - Socket open on the client program.
 # Returns:  # Returns:
 #    1     - continue processing  #    1     - continue processing
 # Side effects:  # Side effects:
 #    Response is written to the client.  #    Response is written to the client.
 #  #
 sub RetrieveChatHandler {  sub retrieve_chat_handler {
   my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
   my $tail     = shift;  
   my $client   = shift;  
   
   my $userinput = "$cmd:$tail";  
   
   my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);      my $userinput = "$cmd:$tail";
   my $reply='';  
   foreach (&getchat($cdom,$cnum,$udom,$uname)) {      my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
     $reply.=&escape($_).':';      my $reply='';
   }      foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
   $reply=~s/\:$//;   $reply.=&escape($_).':';
   Reply($client, $reply."\n", $userinput);      }
       $reply=~s/\:$//;
       &Reply($client, \$reply, $userinput);
   
   
   return 1;      return 1;
 }  }
 RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);  &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
   
 #  #
 #  Initiate a query of an sql database.  SQL query repsonses get put in  #  Initiate a query of an sql database.  SQL query repsonses get put in
 #  a file for later retrieval.  This prevents sql query results from  #  a file for later retrieval.  This prevents sql query results from
Line 2115  RegisterHandler("chatretr", \&RetrieveCh Line 3413  RegisterHandler("chatretr", \&RetrieveCh
 # Side-effects:  # Side-effects:
 #    a reply is written to $client.  #    a reply is written to $client.
 #  #
 sub SendQueryHandler {  sub send_query_handler {
   my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
   my $tail    = shift;  
   my $client  = shift;  
   
   my $userinput = "$cmd:$tail";  
   
   my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);  
   $query=~s/\n*$//g;  
   Reply($client, "". sqlreply("$clientname\&$query".  
       "\&$arg1"."\&$arg2"."\&$arg3")."\n",  
  $userinput);  
   
   return 1;      my $userinput = "$cmd:$tail";
   
       my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
       $query=~s/\n*$//g;
       &Reply($client, "". &sql_reply("$clientname\&$query".
    "\&$arg1"."\&$arg2"."\&$arg3")."\n",
     $userinput);
       
       return 1;
 }  }
 RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);  &register_handler("querysend", \&send_query_handler, 0, 1, 0);
   
 #  #
 #   Add a reply to an sql query.  SQL queries are done asyncrhonously.  #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
Line 2157  RegisterHandler("querysend", \&SendQuery Line 3454  RegisterHandler("querysend", \&SendQuery
 # Side effects:  # Side effects:
 #    ok written to the client.  #    ok written to the client.
 #  #
 sub ReplyQueryHandler {  sub reply_query_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
       my $userinput = "$cmd:$tail";
   my $userinput = "$cmd:$tail";  
       my ($id,$reply)=split(/:/,$tail); 
   my ($cmd,$id,$reply)=split(/:/,$userinput);       my $store;
   my $store;      my $execdir=$perlvar{'lonDaemons'};
   my $execdir=$perlvar{'lonDaemons'};      if ($store=IO::File->new(">$execdir/tmp/$id")) {
   if ($store=IO::File->new(">$execdir/tmp/$id")) {   $reply=~s/\&/\n/g;
     $reply=~s/\&/\n/g;   print $store $reply;
          print $store $reply;   close $store;
     close $store;   my $store2=IO::File->new(">$execdir/tmp/$id.end");
     my $store2=IO::File->new(">$execdir/tmp/$id.end");   print $store2 "done\n";
     print $store2 "done\n";   close $store2;
     close $store2;   &Reply($client, "ok\n", $userinput);
     Reply($client, "ok\n", $userinput);      } else {
   }   &Failure($client, "error: ".($!+0)
   else {   ." IO::File->new Failed ".
     Failure($client, "error: ".($!+0)   "while attempting queryreply\n", $userinput);
     ." IO::File->new Failed ".      }
     "while attempting queryreply\n", $userinput);  
   }  
     
   
   return 1;      return 1;
 }  }
 RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);  &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
   
 #  #
 #  Process the courseidput query.  Not quite sure what this means  #  Process the courseidput request.  Not quite sure what this means
 #  at the system level sense.  It appears a gdbm file in the   #  at the system level sense.  It appears a gdbm file in the 
 #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and  #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
 #  a set of entries made in that database.  #  a set of entries made in that database.
Line 2197  RegisterHandler("queryreply", \&ReplyQue Line 3493  RegisterHandler("queryreply", \&ReplyQue
 #   $tail     - Tail of the command.  In this case consists of a colon  #   $tail     - Tail of the command.  In this case consists of a colon
 #               separated list contaning the domain to apply this to and  #               separated list contaning the domain to apply this to and
 #               an ampersand separated list of keyword=value pairs.  #               an ampersand separated list of keyword=value pairs.
   #               Each value is a colon separated list that includes:  
   #               description, institutional code and course owner.
   #               For backward compatibility with versions included
   #               in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
   #               code and/or course owner are preserved from the existing 
   #               record when writing a new record in response to 1.1 or 
   #               1.2 implementations of lonnet::flushcourselogs().   
   #                      
 #   $client   - Socket open on the client.  #   $client   - Socket open on the client.
 # Returns:  # Returns:
 #   1    - indicating that processing should continue  #   1    - indicating that processing should continue
Line 2204  RegisterHandler("queryreply", \&ReplyQue Line 3508  RegisterHandler("queryreply", \&ReplyQue
 # Side effects:  # Side effects:
 #   reply is written to the client.  #   reply is written to the client.
 #  #
 sub PutCourseIdHandler {  sub put_course_id_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
       my $userinput = "$cmd:$tail";
   my $userinput = "$cmd:$tail";  
       my ($udom, $what) = split(/:/, $tail,2);
   my ($udom,$what)=split(/:/,$tail);      chomp($what);
   chomp($what);      my $now=time;
   $udom=~s/\W//g;      my @pairs=split(/\&/,$what);
   my $proname=  
     "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";      my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
   my $now=time;      if ($hashref) {
   my @pairs=split(/\&/,$what);   foreach my $pair (@pairs) {
   my %hash;              my ($key,$courseinfo) = split(/=/,$pair,2);
   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {              $courseinfo =~ s/=/:/g;
     foreach my $pair (@pairs) {              if (defined($hashref->{$key})) {
       my ($key,$value)=split(/=/,$pair);                  my $value = &Apache::lonnet::thaw_unescape($hashref->{$key});
       $hash{$key}=$value.':'.$now;                  if (ref($value) eq 'HASH') {
     }                      my @items = ('description','inst_code','owner','type');
     if (untie(%hash)) {                      my @new_items = split(/:/,$courseinfo,-1);
       Reply($client, "ok\n", $userinput);                      my %storehash; 
                       for (my $i=0; $i<@new_items; $i++) {
                           $storehash{$items[$i]} = &unescape($new_items[$i]);
                       }
                       $hashref->{$key} = 
                           &Apache::lonnet::freeze_escape(\%storehash);
                       my $unesc_key = &unescape($key);
                       $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
                       next;
                   }
               }
               my @current_items = split(/:/,$hashref->{$key},-1);
               shift(@current_items); # remove description
               pop(@current_items);   # remove last access
               my $numcurrent = scalar(@current_items);
               if ($numcurrent > 3) {
                   $numcurrent = 3;
               }
               my @new_items = split(/:/,$courseinfo,-1);
               my $numnew = scalar(@new_items);
               if ($numcurrent > 0) {
                   if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 
                       for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
                           $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
                       }
                   }
               }
               $hashref->{$key}=$courseinfo.':'.$now;
    }
    if (&untie_domain_hash($hashref)) {
       &Reply( $client, "ok\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)
        ." untie(GDBM) Failed ".
        "while attempting courseidput\n", $userinput);
    }
     } else {      } else {
       Failure( $client, "error: ".($!+0)   &Failure($client, "error: ".($!+0)
        ." untie(GDBM) Failed ".   ." tie(GDBM) Failed ".
        "while attempting courseidput\n", $userinput);   "while attempting courseidput\n", $userinput);
     }      }
   } else {  
     Failure( $client, "error: ".($!+0)  
      ." tie(GDBM) Failed ".  
      "while attempting courseidput\n", $userinput);  
   }  
   
   return 1;      return 1;
 }  }
 RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);  &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
   
   sub put_course_id_hash_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($udom,$mode,$what) = split(/:/, $tail,3);
       chomp($what);
       my $now=time;
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
           foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               my $unesc_key = &unescape($key);
               if ($mode ne 'timeonly') {
                   if (!defined($hashref->{&escape('lasttime:'.$unesc_key)})) {
                       my $curritems = &Apache::lonnet::thaw_unescape($key); 
                       if (ref($curritems) ne 'HASH') {
                           my @current_items = split(/:/,$hashref->{$key},-1);
                           my $lasttime = pop(@current_items);
                           $hashref->{&escape('lasttime:'.$unesc_key)} = $lasttime;
                       } else {
                           $hashref->{&escape('lasttime:'.$unesc_key)} = '';
                       }
                   } 
                   $hashref->{$key} = $value;
               }
               if ($mode ne 'notime') {
                   $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
               }
           }
           if (&untie_domain_hash($hashref)) {
               &Reply($client, "ok\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                        "while attempting courseidputhash\n", $userinput);
           }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                     "while attempting courseidputhash\n", $userinput);
       }
       return 1;
   }
   &register_handler("courseidputhash", \&put_course_id_hash_handler, 0, 1, 0);
   
 #  Retrieves the value of a course id resource keyword pattern  #  Retrieves the value of a course id resource keyword pattern
 #  defined since a starting date.  Both the starting date and the  #  defined since a starting date.  Both the starting date and the
Line 2259  RegisterHandler("courseidput", \&PutCour Line 3636  RegisterHandler("courseidput", \&PutCour
 #                 description - regular expression that is used to filter  #                 description - regular expression that is used to filter
 #                            the dump.  Only keywords matching this regexp  #                            the dump.  Only keywords matching this regexp
 #                            will be used.  #                            will be used.
   #                 institutional code - optional supplied code to filter 
   #                            the dump. Only courses with an institutional code 
   #                            that match the supplied code will be returned.
   #                 owner    - optional supplied username and domain of owner to
   #                            filter the dump.  Only courses for which the course
   #                            owner matches the supplied username and/or domain
   #                            will be returned. Pre-2.2.0 legacy entries from 
   #                            nohist_courseiddump will only contain usernames.
   #                 type     - optional parameter for selection 
   #                 regexp_ok - if true, allow the supplied institutional code
   #                            filter to behave as a regular expression.  
   #                 rtn_as_hash - whether to return the information available for
   #                            each matched item as a frozen hash of all 
   #                            key, value pairs in the item's hash, or as a 
   #                            colon-separated list of (in order) description,
   #                            institutional code, and course owner.
   #                 selfenrollonly - filter by courses allowing self-enrollment  
   #                                  now or in the future (selfenrollonly = 1).
   #                 catfilter - filter by course category, assigned to a course 
   #                             using manually defined categories (i.e., not
   #                             self-cataloging based on on institutional code).   
   #                 showhidden - include course in results even if course  
   #                              was set to be excluded from course catalog (DC only).
   #                 caller -  if set to 'coursecatalog', courses set to be hidden
   #                           from course catalog will be excluded from results (unless
   #                           overridden by "showhidden".
   #
 #     $client  - The socket open on the client.  #     $client  - The socket open on the client.
 # Returns:  # Returns:
 #    1     - Continue processing.  #    1     - Continue processing.
 # Side Effects:  # Side Effects:
 #   a reply is written to $client.  #   a reply is written to $client.
 sub DumpCourseIdHandler {  sub dump_course_id_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;      my $userinput = "$cmd:$tail";
   my $client = shift;  
       my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
   my $userinput = "$cmd:$tail";          $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
           $caller) =split(/:/,$tail);
   my ($udom,$since,$description) =split(/:/,$tail);      my $now = time;
   if (defined($description)) {      if (defined($description)) {
     $description=&unescape($description);   $description=&unescape($description);
   } else {      } else {
     $description='.';   $description='.';
   }      }
   unless (defined($since)) { $since=0; }      if (defined($instcodefilter)) {
   my $qresult='';          $instcodefilter=&unescape($instcodefilter);
   my $proname = "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";      } else {
   my %hash;          $instcodefilter='.';
   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {      }
     while (my ($key,$value) = each(%hash)) {      my ($ownerunamefilter,$ownerdomfilter);
       my ($descr,$lasttime)=split(/\:/,$value);      if (defined($ownerfilter)) {
       if ($lasttime<$since) {           $ownerfilter=&unescape($ownerfilter);
  next;           if ($ownerfilter ne '.' && defined($ownerfilter)) {
       }              if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
       if ($description eq '.') {                   $ownerunamefilter = $1;
  $qresult.=$key.'='.$descr.'&';                   $ownerdomfilter = $2;
       } else {              } else {
  my $unescapeVal = &unescape($descr);                  $ownerunamefilter = $ownerfilter;
  if (eval('$unescapeVal=~/$description/i')) {                  $ownerdomfilter = '';
   $qresult.="$key=$descr&";              }
           }
       } else {
           $ownerfilter='.';
       }
   
       if (defined($coursefilter)) {
           $coursefilter=&unescape($coursefilter);
       } else {
           $coursefilter='.';
       }
       if (defined($typefilter)) {
           $typefilter=&unescape($typefilter);
       } else {
           $typefilter='.';
       }
       if (defined($regexp_ok)) {
           $regexp_ok=&unescape($regexp_ok);
       }
       if (defined($catfilter)) {
           $catfilter=&unescape($catfilter);
       }
       my $unpack = 1;
       if ($description eq '.' && $instcodefilter eq '.' && $coursefilter eq '.' && 
           $typefilter eq '.') {
           $unpack = 0;
       }
       if (!defined($since)) { $since=0; }
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
    while (my ($key,$value) = each(%$hashref)) {
               my ($unesc_key,$lasttime_key,$lasttime,$is_hash,%val,
                   %unesc_val,$selfenroll_end,$selfenroll_types);
               $unesc_key = &unescape($key);
               if ($unesc_key =~ /^lasttime:/) {
                   next;
               } else {
                   $lasttime_key = &escape('lasttime:'.$unesc_key);
               }
               if ($hashref->{$lasttime_key} ne '') {
                   $lasttime = $hashref->{$lasttime_key};
                   next if ($lasttime<$since);
               }
               my $items = &Apache::lonnet::thaw_unescape($value);
               if (ref($items) eq 'HASH') {
                   $is_hash =  1;
                   if ($unpack || !$rtn_as_hash) {
                       $unesc_val{'descr'} = $items->{'description'};
                       $unesc_val{'inst_code'} = $items->{'inst_code'};
                       $unesc_val{'owner'} = $items->{'owner'};
                       $unesc_val{'type'} = $items->{'type'};
                   }
                   $selfenroll_types = $items->{'selfenroll_types'};
                   $selfenroll_end = $items->{'selfenroll_end_date'};
                   if ($selfenrollonly) {
                       next if (!$selfenroll_types);
                       if (($selfenroll_end > 0) && ($selfenroll_end <= $now)) {
                           next;
                       }
                   }
                   if ($catfilter ne '') {
                       next if ($items->{'categories'} eq '');
                       my @categories = split('&',$items->{'categories'}); 
                       next if (@categories == 0);
                       my @subcats = split('&',$catfilter);
                       my $matchcat = 0;
                       foreach my $cat (@categories) {
                           if (grep(/^\Q$cat\E$/,@subcats)) {
                               $matchcat = 1;
                               last;
                           }
                       }
                       next if (!$matchcat);
                   }
                   if ($caller eq 'coursecatalog') {
                       if ($items->{'hidefromcat'} eq 'yes') {
                           next if !$showhidden;
                       }
                   }
               } else {
                   next if ($catfilter ne '');
                   next if ($selfenrollonly); 
                   $is_hash =  0;
                   my @courseitems = split(/:/,$value);
                   $lasttime = pop(@courseitems);
                   if ($hashref->{$lasttime_key} eq '') {
                       next if ($lasttime<$since);
                   }
           ($val{'descr'},$val{'inst_code'},$val{'owner'},$val{'type'}) = @courseitems;
               }
               my $match = 1;
       if ($description ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'descr'} = &unescape($val{'descr'});
                   }
                   if (eval{$unesc_val{'descr'} !~ /\Q$description\E/i}) {
                       $match = 0;
                   }
               }
               if ($instcodefilter ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'inst_code'} = &unescape($val{'inst_code'});
                   }
                   if ($regexp_ok) {
                       if (eval{$unesc_val{'inst_code'} !~ /$instcodefilter/}) {
                           $match = 0;
                       }
                   } else {
                       if (eval{$unesc_val{'inst_code'} !~ /\Q$instcodefilter\E/i}) {
                           $match = 0;
                       }
                   }
       }
               if ($ownerfilter ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'owner'} = &unescape($val{'owner'});
                   }
                   if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
                       if ($unesc_val{'owner'} =~ /:/) {
                           if (eval{$unesc_val{'owner'} !~ 
                                /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i}) {
                               $match = 0;
                           } 
                       } else {
                           if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
                               $match = 0;
                           }
                       }
                   } elsif ($ownerunamefilter ne '') {
                       if ($unesc_val{'owner'} =~ /:/) {
                           if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E:[^:]+$/i}) {
                                $match = 0;
                           }
                       } else {
                           if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
                               $match = 0;
                           }
                       }
                   } elsif ($ownerdomfilter ne '') {
                       if ($unesc_val{'owner'} =~ /:/) {
                           if (eval{$unesc_val{'owner'} !~ /^[^:]+:\Q$ownerdomfilter\E/}) {
                                $match = 0;
                           }
                       } else {
                           if ($ownerdomfilter ne $udom) {
                               $match = 0;
                           }
                       }
                   }
               }
               if ($coursefilter ne '.') {
                   if (eval{$unesc_key !~ /^$udom(_)\Q$coursefilter\E$/}) {
                       $match = 0;
                   }
               }
               if ($typefilter ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'type'} = &unescape($val{'type'});
                   }
                   if ($unesc_val{'type'} eq '') {
                       if ($typefilter ne 'Course') {
                           $match = 0;
                       }
                   } else {
                       if (eval{$unesc_val{'type'} !~ /^\Q$typefilter\E$/}) {
                           $match = 0;
                       }
                   }
               }
               if ($match == 1) {
                   if ($rtn_as_hash) {
                       if ($is_hash) {
                           $qresult.=$key.'='.$value.'&';
                       } else {
                           my %rtnhash = ( 'description' => &unescape($val{'descr'}),
                                           'inst_code' => &unescape($val{'inst_code'}),
                                           'owner'     => &unescape($val{'owner'}),
                                           'type'      => &unescape($val{'type'}),
                                         );
                           my $items = &Apache::lonnet::freeze_escape(\%rtnhash);
                           $qresult.=$key.'='.$items.'&';
                       }
                   } else {
                       if ($is_hash) {
                           $qresult .= $key.'='.&escape($unesc_val{'descr'}).':'.
                                       &escape($unesc_val{'inst_code'}).':'.
                                       &escape($unesc_val{'owner'}).'&';
                       } else {
                           $qresult .= $key.'='.$val{'descr'}.':'.$val{'inst_code'}.
                                       ':'.$val{'owner'}.'&';
                       }
                   }
               }
  }   }
       }   if (&untie_domain_hash($hashref)) {
       chop($qresult);
       &Reply($client, \$qresult, $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting courseiddump\n", $userinput);
     }      }
     if (untie(%hash)) {      return 1;
       chop($qresult);  }
       Reply($client, "$qresult\n", $userinput);  &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
   
   #
   # Puts an unencrypted entry in a namespace db file at the domain level 
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #  Side effects:
   #     reply is written to $client.
   #
   sub put_domain_handler {
       my ($cmd,$tail,$client) = @_;
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$namespace,$what) =split(/:/,$tail,3);
       chomp($what);
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
                                      "P", $what);
       if ($hashref) {
           foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               $hashref->{$key}=$value;
           }
           if (&untie_domain_hash($hashref)) {
               &Reply($client, "ok\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                        "while attempting putdom\n", $userinput);
           }
     } else {      } else {
       Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".          &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);                    "while attempting putdom\n", $userinput);
     }      }
   } else {  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
     "while attempting courseiddump\n", $userinput);  
   }  
   
       return 1;
   }
   &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
   
   # Unencrypted get from the namespace database file at the domain level.
   # This function retrieves a keyed item from a specific named database in the
   # domain directory.
   #
   # Parameters:
   #   $cmd             - Command request keyword (get).
   #   $tail            - Tail of the command.  This is a colon separated list
   #                      consisting of the domain and the 'namespace' 
   #                      which selects the gdbm file to do the lookup in,
   #                      & separated list of keys to lookup.  Note that
   #                      the values are returned as an & separated list too.
   #   $client          - File descriptor open on the client.
   # Returns:
   #   1       - Continue processing.
   #   0       - Exit.
   #  Side effects:
   #     reply is written to $client.
   #
   
   sub get_domain_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$client:$tail";
   
       my ($udom,$namespace,$what)=split(/:/,$tail,3);
       chomp($what);
       my @queries=split(/\&/,$what);
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
       if ($hashref) {
           for (my $i=0;$i<=$#queries;$i++) {
               $qresult.="$hashref->{$queries[$i]}&";
           }
           if (&untie_domain_hash($hashref)) {
               $qresult=~s/\&$//;
               &Reply($client, \$qresult, $userinput);
           } else {
               &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                         "while attempting getdom\n",$userinput);
           }
       } else {
           &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                    "while attempting getdom\n",$userinput);
       }
   
   return 1;      return 1;
 }  }
 RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);  &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
   
   
 #  #
 #  Puts an id to a domains id database.   #  Puts an id to a domains id database. 
 #  #
Line 2328  RegisterHandler("courseiddump", \&DumpCo Line 4015  RegisterHandler("courseiddump", \&DumpCo
 #  Side effects:  #  Side effects:
 #     reply is written to $client.  #     reply is written to $client.
 #  #
 sub PutIdHandler {  sub put_id_handler {
   my $cmd    = shift;      my ($cmd,$tail,$client) = @_;
   my $tail   = shift;  
   my $client = shift;  
       my $userinput = "$cmd:$tail";
   my $userinput = "$cmd:$tail";  
       my ($udom,$what)=split(/:/,$tail);
   my ($udom,$what)=split(/:/,$tail);      chomp($what);
   chomp($what);      my @pairs=split(/\&/,$what);
   $udom=~s/\W//g;      my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
   my $proname="$perlvar{'lonUsersDir'}/$udom/ids";     "P", $what);
   my $now=time;      if ($hashref) {
   {   foreach my $pair (@pairs) {
     my $hfh;      my ($key,$value)=split(/=/,$pair);
     if ($hfh=IO::File->new(">>$proname.hist")) {       $hashref->{$key}=$value;
       print $hfh "P:$now:$what\n";    }
     }   if (&untie_domain_hash($hashref)) {
   }      &Reply($client, "ok\n", $userinput);
   my @pairs=split(/\&/,$what);   } else {
   my %hash;      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {       "while attempting idput\n", $userinput);
     foreach my $pair (@pairs) {   }
       my ($key,$value)=split(/=/,$pair);  
       $hash{$key}=$value;  
     }  
     if (untie(%hash)) {  
       Reply($client, "ok\n", $userinput);  
     } else {      } else {
       Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
       "while attempting idput\n", $userinput);    "while attempting idput\n", $userinput);
     }      }
   } else {  
     Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
      "while attempting idput\n", $userinput);  
   }  
   
   return 1;      return 1;
 }  }
   &register_handler("idput", \&put_id_handler, 0, 1, 0);
   
 RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);  
 #  #
 #  Retrieves a set of id values from the id database.  #  Retrieves a set of id values from the id database.
 #  Returns an & separated list of results, one for each requested id to the  #  Returns an & separated list of results, one for each requested id to the
Line 2387  RegisterHandler("idput", \&PutIdHandler, Line 4065  RegisterHandler("idput", \&PutIdHandler,
 # Side effects:  # Side effects:
 #   An & separated list of results is written to $client.  #   An & separated list of results is written to $client.
 #  #
 sub GetIdHandler {  sub get_id_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;      
       my $userinput = "$client:$tail";
   my $userinput = "$client:$tail";  
   
   my ($udom,$what)=split(/:/,$tail);  
   chomp($what);  
   $udom=~s/\W//g;  
   my $proname="$perlvar{'lonUsersDir'}/$udom/ids";  
   my @queries=split(/\&/,$what);  
   my $qresult='';  
   my %hash;  
   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {  
     for (my $i=0;$i<=$#queries;$i++) {  
       $qresult.="$hash{$queries[$i]}&";  
     }  
     if (untie(%hash)) {  
       $qresult=~s/\&$//;  
       Reply($client, "$qresult\n", $userinput);  
     } else {  
       Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".  
        "while attempting idget\n",$userinput);  
     }  
   } else {  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
                         "while attempting idget\n",$userinput);  
   }  
   
   return 1;  
 }  
 RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);  
 #------------------------------------------------------------------------------------  
 #  
 #   Process a Request.  Takes a request from the client validates  
 #   it and performs the operation requested by it.  Returns  
 #   a response to the client.  
 #  
 #  Parameters:  
 #      request      - A string containing the user's request.  
 #  Returns:  
 #      0            - Requested to exit, caller should shut down.  
 #      1            - Accept additional requests from the client.  
 #  
 sub ProcessRequest {  
    my $Request      = shift;  
    my $KeepGoing    = 1; # Assume we're not asked to stop.  
           
    my $wasenc=0;      my ($udom,$what)=split(/:/,$tail);
    my $userinput = $Request;   # for compatibility with oldcode <yeach>      chomp($what);
       my @queries=split(/\&/,$what);
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
       if ($hashref) {
    for (my $i=0;$i<=$#queries;$i++) {
       $qresult.="$hashref->{$queries[$i]}&";
    }
    if (&untie_domain_hash($hashref)) {
       $qresult=~s/\&$//;
       &Reply($client, \$qresult, $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
         "while attempting idget\n",$userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting idget\n",$userinput);
       }
       
       return 1;
   }
   &register_handler("idget", \&get_id_handler, 0, 1, 0);
   
   #
   # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
   #
   # Parameters
   #   $cmd       - Command keyword that caused us to be dispatched.
   #   $tail      - Tail of the command.  Consists of a colon separated:
   #               domain - the domain whose dcmail we are recording
   #               email    Consists of key=value pair 
   #                        where key is unique msgid
   #                        and value is message (in XML)
   #   $client    - Socket open on the client.
   #
   # Returns:
   #    1 - indicating processing should continue.
   # Side effects
   #     reply is written to $client.
   #
   sub put_dcmail_handler {
       my ($cmd,$tail,$client) = @_;
       my $userinput = "$cmd:$tail";
                                                                                   
       my ($udom,$what)=split(/:/,$tail);
       chomp($what);
       my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
       if ($hashref) {
           my ($key,$value)=split(/=/,$what);
           $hashref->{$key}=$value;
       }
       if (&untie_domain_hash($hashref)) {
           &Reply($client, "ok\n", $userinput);
       } else {
           &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                    "while attempting dcmailput\n", $userinput);
       }
       return 1;
   }
   &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
   
 # ------------------------------------------------------------ See if encrypted  #
      # Retrieves broadcast e-mail from nohist_dcmail database
    if($userinput =~ /^enc/) {  # Returns to client an & separated list of key=value pairs,
       $wasenc = 1;  # where key is msgid and value is message information.
       $userinput = Decipher($userinput);  #
       if(! $userinput) {  # Parameters
          Failure($client,"error:Encrypted data without negotiating key");  #   $cmd       - Command keyword that caused us to be dispatched.
          return 0;                      # Break off with this imposter.  #   $tail      - Tail of the command.  Consists of a colon separated:
       }  #               domain - the domain whose dcmail table we dump
    }  #               startfilter - beginning of time window 
    # Split off the request keyword from the rest of the stuff.  #               endfilter - end of time window
      #               sendersfilter - & separated list of username:domain 
    my ($command, $tail) = split(/:/, $userinput, 2);  #                 for senders to search for.
      #   $client    - Socket open on the client.
      #
 # ------------------------------------------------------------- Normal commands  # Returns:
   #    1 - indicating processing should continue.
   # Side effects
   #     reply (& separated list of msgid=messageinfo pairs) is 
   #     written to $client.
   #
   sub dump_dcmail_handler {
       my ($cmd, $tail, $client) = @_;
                                                                                   
       my $userinput = "$cmd:$tail";
       my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
       chomp($sendersfilter);
       my @senders = ();
       if (defined($startfilter)) {
           $startfilter=&unescape($startfilter);
       } else {
           $startfilter='.';
       }
       if (defined($endfilter)) {
           $endfilter=&unescape($endfilter);
       } else {
           $endfilter='.';
       }
       if (defined($sendersfilter)) {
           $sendersfilter=&unescape($sendersfilter);
    @senders = map { &unescape($_) } split(/\&/,$sendersfilter);
       }
   
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
       if ($hashref) {
           while (my ($key,$value) = each(%$hashref)) {
               my $match = 1;
               my ($timestamp,$subj,$uname,$udom) = 
    split(/:/,&unescape(&unescape($key)),5); # yes, twice really
               $subj = &unescape($subj);
               unless ($startfilter eq '.' || !defined($startfilter)) {
                   if ($timestamp < $startfilter) {
                       $match = 0;
                   }
               }
               unless ($endfilter eq '.' || !defined($endfilter)) {
                   if ($timestamp > $endfilter) {
                       $match = 0;
                   }
               }
               unless (@senders < 1) {
                   unless (grep/^$uname:$udom$/,@senders) {
                       $match = 0;
                   }
               }
               if ($match == 1) {
                   $qresult.=$key.'='.$value.'&';
               }
           }
           if (&untie_domain_hash($hashref)) {
               chop($qresult);
               &Reply($client, \$qresult, $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                       "while attempting dcmaildump\n", $userinput);
           }
       } else {
           &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   "while attempting dcmaildump\n", $userinput);
       }
       return 1;
   }
   
    #   &register_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
    #   If the command is in the hash, then execute it via the hash dispatch:  
    #  
    if(defined $Dispatcher{$command}) {  
   
       my $DispatchInfo = $Dispatcher{$command};  
       my $Handler      = $$DispatchInfo[0];  
       my $NeedEncode   = $$DispatchInfo[1];  
       my $ClientTypes  = $$DispatchInfo[2];  
         
       #  Validate the request:  
         
       my $ok = 1;  
       if($NeedEncode && (!$wasenc)) {  
          Reply($client, "refused\n", $userinput);  
          $ok = 0;  
       }  
       if(isClient && (($ClientTypes & $CLIENT_OK) == 0)) {  
          Reply($client, "refused\n", $userinput);  
          $ok = 0;  
       }  
       if(isManager && (($ClientTypes & $MANAGER_OK) == 0)) {  
          Reply($client, "refused\n", $userinput);  
          $ok = 0;  
       }  
       if($ok) {  
          $KeepGoing = &$Handler($command, $tail, $client);  
       }  
   
   #
   # Puts domain roles in nohist_domainroles database
   #
   # Parameters
   #   $cmd       - Command keyword that caused us to be dispatched.
   #   $tail      - Tail of the command.  Consists of a colon separated:
   #               domain - the domain whose roles we are recording  
   #               role -   Consists of key=value pair
   #                        where key is unique role
   #                        and value is start/end date information
   #   $client    - Socket open on the client.
   #
   # Returns:
   #    1 - indicating processing should continue.
   # Side effects
   #     reply is written to $client.
   #
   
   sub put_domainroles_handler {
       my ($cmd,$tail,$client) = @_;
   
       my $userinput = "$cmd:$tail";
       my ($udom,$what)=split(/:/,$tail);
       chomp($what);
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
       if ($hashref) {
           foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               $hashref->{$key}=$value;
           }
           if (&untie_domain_hash($hashref)) {
               &Reply($client, "ok\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                        "while attempting domroleput\n", $userinput);
           }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                     "while attempting domroleput\n", $userinput);
       }
                                                                                     
       return 1;
   }
   
   &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
   
 # ---------------------------------------------------------------------- tmpput  #
    } elsif ($userinput =~ /^tmpput/) {  # Retrieves domain roles from nohist_domainroles database
       if(isClient) {  # Returns to client an & separated list of key=value pairs,
          my ($cmd,$what)=split(/:/,$userinput);  # where key is role and value is start and end date information.
          my $store;  #
          $tmpsnum++;  # Parameters
          my $id=$$.'_'.$clientip.'_'.$tmpsnum;  #   $cmd       - Command keyword that caused us to be dispatched.
          $id=~s/\W/\_/g;  #   $tail      - Tail of the command.  Consists of a colon separated:
          $what=~s/\n//g;  #               domain - the domain whose domain roles table we dump
          my $execdir=$perlvar{'lonDaemons'};  #   $client    - Socket open on the client.
          if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {  #
             print $store $what;  # Returns:
             close $store;  #    1 - indicating processing should continue.
             Reply($client, "$id\n", $userinput);  # Side effects
          }  #     reply (& separated list of role=start/end info pairs) is
          else {  #     written to $client.
             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".  #
                            "while attempting tmpput\n", $userinput);  sub dump_domainroles_handler {
          }      my ($cmd, $tail, $client) = @_;
       } else {                                                                                             
          Failure($client, "refused\n", $userinput);      my $userinput = "$cmd:$tail";
           my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
       }      chomp($rolesfilter);
       my @roles = ();
 # ---------------------------------------------------------------------- tmpget      if (defined($startfilter)) {
    } elsif ($userinput =~ /^tmpget/) {          $startfilter=&unescape($startfilter);
       if(isClient) {      } else {
          my ($cmd,$id)=split(/:/,$userinput);          $startfilter='.';
          chomp($id);      }
          $id=~s/\W/\_/g;      if (defined($endfilter)) {
          my $store;          $endfilter=&unescape($endfilter);
          my $execdir=$perlvar{'lonDaemons'};      } else {
          if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {          $endfilter='.';
             my $reply=<$store>;      }
             Reply( $client, "$reply\n", $userinput);      if (defined($rolesfilter)) {
             close $store;          $rolesfilter=&unescape($rolesfilter);
          }   @roles = split(/\&/,$rolesfilter);
          else {      }
             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".                                                                                             
                                "while attempting tmpget\n", $userinput);      my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
          }      if ($hashref) {
       } else {          my $qresult = '';
          Failure($client, "refused\n", $userinput);          while (my ($key,$value) = each(%$hashref)) {
                   my $match = 1;
       }              my ($start,$end) = split(/:/,&unescape($value));
 # ---------------------------------------------------------------------- tmpdel              my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
    } elsif ($userinput =~ /^tmpdel/) {              unless ($startfilter eq '.' || !defined($startfilter)) {
       if(isClient) {                  if ($start >= $startfilter) {
          my ($cmd,$id)=split(/:/,$userinput);                      $match = 0;
          chomp($id);                  }
          $id=~s/\W/\_/g;  
          my $execdir=$perlvar{'lonDaemons'};  
          if (unlink("$execdir/tmp/$id.tmp")) {  
             Reply($client, "ok\n", $userinput);  
          } else {  
             Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".  
                                  "while attempting tmpdel\n", $userinput);  
          }  
       } else {  
          Failure($client, "refused\n", $userinput);  
       }  
 # -------------------------------------------------------------------------- ls  
    } elsif ($userinput =~ /^ls/) {  
       if(isClient) {  
          my ($cmd,$ulsdir)=split(/:/,$userinput);  
          my $ulsout='';  
          my $ulsfn;  
          if (-e $ulsdir) {  
             if(-d $ulsdir) {  
                if (opendir(LSDIR,$ulsdir)) {  
                   while ($ulsfn=readdir(LSDIR)) {  
                      my @ulsstats=stat($ulsdir.'/'.$ulsfn);  
                      $ulsout.=$ulsfn.'&'.  
                      join('&',@ulsstats).':';  
                   }  
                   closedir(LSDIR);  
                }  
             } else {  
                my @ulsstats=stat($ulsdir);  
                $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';  
             }              }
          } else {              unless ($endfilter eq '.' || !defined($endfilter)) {
             $ulsout='no_such_dir';                  if ($end <= $endfilter) {
          }                      $match = 0;
          if ($ulsout eq '') { $ulsout='empty'; }                  }
          Reply($client, "$ulsout\n", $userinput);              }
       } else {              unless (@roles < 1) {
          Failure($client, "refused\n", $userinput);                  unless (grep/^\Q$trole\E$/,@roles) {
                           $match = 0;
       }                  }
 # ----------------------------------------------------------------- setannounce              }
    } elsif ($userinput =~ /^setannounce/) {              if ($match == 1) {
       if (isClient) {                  $qresult.=$key.'='.$value.'&';
          my ($cmd,$announcement)=split(/:/,$userinput);              }
          chomp($announcement);          }
          $announcement=&unescape($announcement);          if (&untie_domain_hash($hashref)) {
          if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.              chop($qresult);
                                              '/announcement.txt')) {              &Reply($client, \$qresult, $userinput);
             print $store $announcement;          } else {
             close $store;              &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
             Reply($client, "ok\n", $userinput);                      "while attempting domrolesdump\n", $userinput);
          } else {          }
             Failure($client, "error: ".($!+0)."\n", $userinput);      } else {
          }          &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       } else {                  "while attempting domrolesdump\n", $userinput);
          Failure($client, "refused\n", $userinput);      }
           return 1;
       }  
 # ------------------------------------------------------------------ Hanging up  
    } elsif (($userinput =~ /^exit/) ||  
          ($userinput =~ /^init/)) { # no restrictions.  
       &logthis("Client $clientip ($clientname) hanging up: $userinput");  
       Reply($client, "bye\n", $userinput);  
       $client->shutdown(2);        # shutdown the socket forcibly.  
       $client->close();  
       $KeepGoing = 0; # Flag to exit the program.  
   
 # ---------------------------------- set current host/domain  
    } elsif ($userinput =~ /^sethost:/) {  
       if (isClient) {  
          Reply($client, &sethost($userinput)."\n", $userinput);  
       } else {  
          Failure($client, "refused\n", $userinput);  
       }  
 #---------------------------------- request file (?) version.  
     } elsif ($userinput =~/^version:/) {  
  if (isClient) {  
     Reply($client, &version($userinput)."\n", $userinput);  
  } else {  
     Reply( $client, "refused\n", $userinput);  
  }  
 # ------------------------------------------------------------- unknown command  
   
    } else {  
  # unknown command  
       Failure($client, "unknown_cmd\n", $userinput);  
    }  
   
     return $KeepGoing;  
 }  }
   
   &register_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
   
   
   #  Process the tmpput command I'm not sure what this does.. Seems to
   #  create a file in the lonDaemons/tmp directory of the form $id.tmp
   # where Id is the client's ip concatenated with a sequence number.
   # The file will contain some value that is passed in.  Is this e.g.
   # a login token?
 #  #
 #   GetCertificate: Given a transaction that requires a certificate,  # Parameters:
 #   this function will extract the certificate from the transaction  #    $cmd     - The command that got us dispatched.
 #   request.  Note that at this point, the only concept of a certificate  #    $tail    - The remainder of the request following $cmd:
 #   is the hostname to which we are connected.  #               In this case this will be the contents of the file.
   #    $client  - Socket connected to the client.
   # Returns:
   #    1 indicating processing can continue.
   # Side effects:
   #   A file is created in the local filesystem.
   #   A reply is sent to the client.
   sub tmp_put_handler {
       my ($cmd, $what, $client) = @_;
   
       my $userinput = "$cmd:$what"; # Reconstruct for logging.
   
       my ($record,$context) = split(/:/,$what);
       if ($context ne '') {
           chomp($context);
           $context = &unescape($context);
       }
       my ($id,$store);
       $tmpsnum++;
       if ($context eq 'resetpw') {
           $id = &md5_hex(&md5_hex(time.{}.rand().$$));
       } else {
           $id = $$.'_'.$clientip.'_'.$tmpsnum;
       }
       $id=~s/\W/\_/g;
       $record=~s/\n//g;
       my $execdir=$perlvar{'lonDaemons'};
       if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
    print $store $record;
    close $store;
    &Reply($client, \$id, $userinput);
       } else {
    &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
     "while attempting tmpput\n", $userinput);
       }
       return 1;
     
   }
   &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
   
   #   Processes the tmpget command.  This command returns the contents
   #  of a temporary resource file(?) created via tmpput.
 #  #
 #   Parameter:  # Paramters:
 #      request   - The request sent by our client (this parameterization may  #    $cmd      - Command that got us dispatched.
 #                  need to change when we really use a certificate granting  #    $id       - Tail of the command, contain the id of the resource
 #                  authority.  #                we want to fetch.
   #    $client   - socket open on the client.
   # Return:
   #    1         - Inidcating processing can continue.
   # Side effects:
   #   A reply is sent to the client.
 #  #
 sub GetCertificate {  sub tmp_get_handler {
     my $request = shift;      my ($cmd, $id, $client) = @_;
   
     return $clientip;      my $userinput = "$cmd:$id"; 
       
   
       $id=~s/\W/\_/g;
       my $store;
       my $execdir=$perlvar{'lonDaemons'};
       if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
    my $reply=<$store>;
    &Reply( $client, \$reply, $userinput);
    close $store;
       } else {
    &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
     "while attempting tmpget\n", $userinput);
       }
   
       return 1;
 }  }
   &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
   
   #
   #  Process the tmpdel command.  This command deletes a temp resource
   #  created by the tmpput command.
   #
   # Parameters:
   #   $cmd      - Command that got us here.
   #   $id       - Id of the temporary resource created.
   #   $client   - socket open on the client process.
   #
   # Returns:
   #   1     - Indicating processing should continue.
   # Side Effects:
   #   A file is deleted
   #   A reply is sent to the client.
   sub tmp_del_handler {
       my ($cmd, $id, $client) = @_;
       
       my $userinput= "$cmd:$id";
       
       chomp($id);
       $id=~s/\W/\_/g;
       my $execdir=$perlvar{'lonDaemons'};
       if (unlink("$execdir/tmp/$id.tmp")) {
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
     "while attempting tmpdel\n", $userinput);
       }
       
       return 1;
   
   }
   &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
   
 #  #
 #   ReadManagerTable: Reads in the current manager table. For now this is  #   Processes the setannounce command.  This command
 #                     done on each manager authentication because:  #   creates a file named announce.txt in the top directory of
 #                     - These authentications are not frequent  #   the documentn root and sets its contents.  The announce.txt file is
 #                     - This allows dynamic changes to the manager table  #   printed in its entirety at the LonCAPA login page.  Note:
 #                       without the need to signal to the lond.  #   once the announcement.txt fileis created it cannot be deleted.
   #   However, setting the contents of the file to empty removes the
   #   announcement from the login page of loncapa so who cares.
 #  #
   # Parameters:
   #    $cmd          - The command that got us dispatched.
   #    $announcement - The text of the announcement.
   #    $client       - Socket open on the client process.
   # Retunrns:
   #   1             - Indicating request processing should continue
   # Side Effects:
   #   The file {DocRoot}/announcement.txt is created.
   #   A reply is sent to $client.
   #
   sub set_announce_handler {
       my ($cmd, $announcement, $client) = @_;
     
       my $userinput    = "$cmd:$announcement";
   
 sub ReadManagerTable {      chomp($announcement);
       $announcement=&unescape($announcement);
       if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
    '/announcement.txt')) {
    print $store $announcement;
    close $store;
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)."\n", $userinput);
       }
   
     #   Clean out the old table first..      return 1;
   }
   &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
   
    foreach my $key (keys %managers) {  #
       delete $managers{$key};  #  Return the version of the daemon.  This can be used to determine
    }  #  the compatibility of cross version installations or, alternatively to
   #  simply know who's out of date and who isn't.  Note that the version
   #  is returned concatenated with the tail.
   # Parameters:
   #   $cmd        - the request that dispatched to us.
   #   $tail       - Tail of the request (client's version?).
   #   $client     - Socket open on the client.
   #Returns:
   #   1 - continue processing requests.
   # Side Effects:
   #   Replies with version to $client.
   sub get_version_handler {
       my ($cmd, $tail, $client) = @_;
   
    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";      my $userinput  = $cmd.$tail;
    if (!open (MANAGERS, $tablename)) {      
       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');      &Reply($client, &version($userinput)."\n", $userinput);
       return;  
    }  
    while(my $host = <MANAGERS>) {      return 1;
       chomp($host);  
       if ($host =~ "^#") {                  # Comment line.  
          logthis('<font color="green"> Skipping line: '. "$host</font>\n");  
          next;  
       }  
       if (!defined $hostip{$host}) { # This is a non cluster member  
     #  The entry is of the form:  
     #    cluname:hostname  
     #  cluname - A 'cluster hostname' is needed in order to negotiate  
     #            the host key.  
     #  hostname- The dns name of the host.  
     #  
           my($cluname, $dnsname) = split(/:/, $host);  
             
           my $ip = gethostbyname($dnsname);  
           if(defined($ip)) {                 # bad names don't deserve entry.  
             my $hostip = inet_ntoa($ip);  
             $managers{$hostip} = $cluname;  
             logthis('<font color="green"> registering manager '.  
                     "$dnsname as $cluname with $hostip </font>\n");  
          }  
       } else {  
          logthis('<font color="green"> existing host'." $host</font>\n");  
          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber  
       }  
    }  
 }  }
   &register_handler("version", \&get_version_handler, 0, 1, 0);
   
   #  Set the current host and domain.  This is used to support
   #  multihomed systems.  Each IP of the system, or even separate daemons
   #  on the same IP can be treated as handling a separate lonCAPA virtual
   #  machine.  This command selects the virtual lonCAPA.  The client always
   #  knows the right one since it is lonc and it is selecting the domain/system
   #  from the hosts.tab file.
   # Parameters:
   #    $cmd      - Command that dispatched us.
   #    $tail     - Tail of the command (domain/host requested).
   #    $socket   - Socket open on the client.
 #  #
 #  ValidManager: Determines if a given certificate represents a valid manager.  # Returns:
 #                in this primitive implementation, the 'certificate' is  #     1   - Indicates the program should continue to process requests.
 #                just the connecting loncapa client name.  This is checked  # Side-effects:
 #                against a valid client list in the configuration.  #     The default domain/system context is modified for this daemon.
   #     a reply is sent to the client.
 #  #
 #                    sub set_virtual_host_handler {
 sub ValidManager {      my ($cmd, $tail, $socket) = @_;
     my $certificate = shift;     
       my $userinput  ="$cmd:$tail";
   
     return isManager;      &Reply($client, &sethost($userinput)."\n", $userinput);
   
   
       return 1;
 }  }
   &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
   
   #  Process a request to exit:
   #   - "bye" is sent to the client.
   #   - The client socket is shutdown and closed.
   #   - We indicate to the caller that we should exit.
   # Formal Parameters:
   #   $cmd                - The command that got us here.
   #   $tail               - Tail of the command (empty).
   #   $client             - Socket open on the tail.
   # Returns:
   #   0      - Indicating the program should exit!!
 #  #
 #  CopyFile:  Called as part of the process of installing a   sub exit_handler {
 #             new configuration file.  This function copies an existing      my ($cmd, $tail, $client) = @_;
 #             file to a backup file.  
 # Parameters:  
 #     oldfile  - Name of the file to backup.  
 #     newfile  - Name of the backup file.  
 # Return:  
 #     0   - Failure (errno has failure reason).  
 #     1   - Success.  
 #  
 sub CopyFile {  
     my $oldfile = shift;  
     my $newfile = shift;  
   
     #  The file must exist:      my $userinput = "$cmd:$tail";
   
     if(-e $oldfile) {      &logthis("Client $clientip ($clientname) hanging up: $userinput");
       &Reply($client, "bye\n", $userinput);
       $client->shutdown(2);        # shutdown the socket forcibly.
       $client->close();
   
  # Read the old file.      return 0;
   }
   &register_handler("exit", \&exit_handler, 0,1,1);
   &register_handler("init", \&exit_handler, 0,1,1);
   &register_handler("quit", \&exit_handler, 0,1,1);
   
  my $oldfh = IO::File->new("< $oldfile");  #  Determine if auto-enrollment is enabled.
  if(!$oldfh) {  #  Note that the original had what I believe to be a defect.
     return 0;  #  The original returned 0 if the requestor was not a registerd client.
  }  #  It should return "refused".
  my @contents = <$oldfh>;  # Suck in the entire file.  # Formal Parameters:
   #   $cmd       - The command that invoked us.
   #   $tail      - The tail of the command (Extra command parameters.
   #   $client    - The socket open on the client that issued the request.
   # Returns:
   #    1         - Indicating processing should continue.
   #
   sub enrollment_enabled_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = $cmd.":".$tail; # For logging purposes.
   
  # write the backup file:      
       my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
   
  my $newfh = IO::File->new("> $newfile");      my $outcome  = &localenroll::run($cdom);
  if(!(defined $newfh)){      &Reply($client, \$outcome, $userinput);
     return 0;  
  }      return 1;
  my $lines = scalar @contents;  }
  for (my $i =0; $i < $lines; $i++) {  &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
     print $newfh ($contents[$i]);  
  }  
   
  $oldfh->close;  #   Get the official sections for which auto-enrollment is possible.
  $newfh->close;  #   Since the admin people won't know about 'unofficial sections' 
   #   we cannot auto-enroll on them.
   # Formal Parameters:
   #    $cmd     - The command request that got us dispatched here.
   #    $tail    - The remainder of the request.  In our case this
   #               will be split into:
   #               $coursecode   - The course name from the admin point of view.
   #               $cdom         - The course's domain(?).
   #    $client  - Socket open on the client.
   # Returns:
   #    1    - Indiciting processing should continue.
   #
   sub get_sections_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
   
  chmod(0660, $newfile);      my ($coursecode, $cdom) = split(/:/, $tail);
       my @secs = &localenroll::get_sections($coursecode,$cdom);
       my $seclist = &escape(join(':',@secs));
   
  return 1;      &Reply($client, \$seclist, $userinput);
           
     } else {  
  return 0;      return 1;
     }  
 }  }
   &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
   
   #   Validate the owner of a new course section.  
 #  #
 #  Host files are passed out with externally visible host IPs.  # Formal Parameters:
 #  If, for example, we are behind a fire-wall or NAT host, our   #   $cmd      - Command that got us dispatched.
 #  internally visible IP may be different than the externally  #   $tail     - the remainder of the command.  For us this consists of a
 #  visible IP.  Therefore, we always adjust the contents of the  #               colon separated string containing:
 #  host file so that the entry for ME is the IP that we believe  #                  $inst    - Course Id from the institutions point of view.
 #  we have.  At present, this is defined as the entry that  #                  $owner   - Proposed owner of the course.
 #  DNS has for us.  If by some chance we are not able to get a  #                  $cdom    - Domain of the course (from the institutions
 #  DNS translation for us, then we assume that the host.tab file  #                             point of view?)..
 #  is correct.    #   $client   - Socket open on the client.
 #    BUGBUGBUG - in the future, we really should see if we can  
 #       easily query the interface(s) instead.  
 # Parameter(s):  
 #     contents    - The contents of the host.tab to check.  
 # Returns:  
 #     newcontents - The adjusted contents.  
 #  #
   # Returns:
   #   1        - Processing should continue.
 #  #
 sub AdjustHostContents {  sub validate_course_owner_handler {
     my $contents  = shift;      my ($cmd, $tail, $client)  = @_;
     my $adjusted;      my $userinput = "$cmd:$tail";
     my $me        = $perlvar{'lonHostID'};      my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
   
       $owner = &unescape($owner);
       my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
       &Reply($client, \$outcome, $userinput);
   
  foreach my $line (split(/\n/,$contents)) {  
  if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {  
     chomp($line);      return 1;
     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);  
     if ($id eq $me) {  
           my $ip = gethostbyname($name);  
           my $ipnew = inet_ntoa($ip);  
          $ip = $ipnew;  
  #  Reconstruct the host line and append to adjusted:  
   
    my $newline = "$id:$domain:$role:$name:$ip";  
    if($maxcon ne "") { # Not all hosts have loncnew tuning params  
      $newline .= ":$maxcon:$idleto:$mincon";  
    }  
    $adjusted .= $newline."\n";  
   
       } else { # Not me, pass unmodified.  
    $adjusted .= $line."\n";  
       }  
  } else {                  # Blank or comment never re-written.  
     $adjusted .= $line."\n"; # Pass blanks and comments as is.  
  }  
  }  
  return $adjusted;  
 }  }
   &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
   
 #  #
 #   InstallFile: Called to install an administrative file:  #   Validate a course section in the official schedule of classes
 #       - The file is created with <name>.tmp  #   from the institutions point of view (part of autoenrollment).
 #       - The <name>.tmp file is then mv'd to <name>  
 #   This lugubrious procedure is done to ensure that we are never without  
 #   a valid, even if dated, version of the file regardless of who crashes  
 #   and when the crash occurs.  
 #  #
 #  Parameters:  # Formal Parameters:
 #       Name of the file  #   $cmd          - The command request that got us dispatched.
 #       File Contents.  #   $tail         - The tail of the command.  In this case,
 #  Return:  #                   this is a colon separated set of words that will be split
 #      nonzero - success.  #                   into:
 #      0       - failure and $! has an errno.  #                        $inst_course_id - The course/section id from the
   #                                          institutions point of view.
   #                        $cdom           - The domain from the institutions
   #                                          point of view.
   #   $client       - Socket open on the client.
   # Returns:
   #    1           - Indicating processing should continue.
 #  #
 sub InstallFile {  sub validate_course_section_handler {
     my $Filename = shift;      my ($cmd, $tail, $client) = @_;
     my $Contents = shift;      my $userinput = "$cmd:$tail";
     my $TempFile = $Filename.".tmp";      my ($inst_course_id, $cdom) = split(/:/, $tail);
   
     #  Open the file for write:      my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
       &Reply($client, \$outcome, $userinput);
   
     my $fh = IO::File->new("> $TempFile"); # Write to temp.  
     if(!(defined $fh)) {  
  &logthis('<font color="red"> Unable to create '.$TempFile."</font>");  
  return 0;  
     }  
     #  write the contents of the file:  
   
     print $fh ($Contents);       return 1;
     $fh->close; # In case we ever have a filesystem w. locking  }
   &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
   
     chmod(0660, $TempFile);  #
   #   Validate course owner's access to enrollment data for specific class section. 
   #   
   #
   # Formal Parameters:
   #    $cmd     - The command request that got us dispatched.
   #    $tail    - The tail of the command.   In this case this is a colon separated
   #               set of words that will be split into:
   #               $inst_class  - Institutional code for the specific class section   
   #               $courseowner - The escaped username:domain of the course owner 
   #               $cdom        - The domain of the course from the institution's
   #                              point of view.
   #    $client  - The socket open on the client.
   # Returns:
   #    1 - continue processing.
   #
   
     # Now we can move install the file in position.  sub validate_class_access_handler {
           my ($cmd, $tail, $client) = @_;
     move($TempFile, $Filename);      my $userinput = "$cmd:$tail";
       my ($inst_class,$ownerlist,$cdom) = split(/:/, $tail);
       my $owners = &unescape($ownerlist);
       my $outcome;
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $outcome=&localenroll::check_section($inst_class,$owners,$cdom);
       };
       &Reply($client,\$outcome, $userinput);
   
     return 1;      return 1;
 }  }
   &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
   
 #  #
 #   ConfigFileFromSelector: converts a configuration file selector  #   Create a password for a new LON-CAPA user added by auto-enrollment.
 #                 (one of host or domain at this point) into a   #   Only used for case where authentication method for new user is localauth
 #                 configuration file pathname.  
 #  #
 #  Parameters:  # Formal Parameters:
 #      selector  - Configuration file selector.  #    $cmd     - The command request that got us dispatched.
 #  Returns:  #    $tail    - The tail of the command.   In this case this is a colon separated
 #      Full path to the file or undef if the selector is invalid.  #               set of words that will be split into:
   #               $authparam - An authentication parameter (localauth parameter).
   #               $cdom      - The domain of the course from the institution's
   #                            point of view.
   #    $client  - The socket open on the client.
   # Returns:
   #    1 - continue processing.
 #  #
 sub ConfigFileFromSelector {  sub create_auto_enroll_password_handler {
     my $selector   = shift;      my ($cmd, $tail, $client) = @_;
     my $tablefile;      my $userinput = "$cmd:$tail";
   
     my $tabledir = $perlvar{'lonTabDir'}.'/';      my ($authparam, $cdom) = split(/:/, $userinput);
     if ($selector eq "hosts") {  
  $tablefile = $tabledir."hosts.tab";  
     } elsif ($selector eq "domain") {  
  $tablefile = $tabledir."domain.tab";  
     } else {  
  return undef;  
     }  
     return $tablefile;  
   
       my ($create_passwd,$authchk);
       ($authparam,
        $create_passwd,
        $authchk) = &localenroll::create_password($authparam,$cdom);
   
       &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
      $userinput);
   
   
       return 1;
 }  }
   &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
     0, 1, 0);
   
   #   Retrieve and remove temporary files created by/during autoenrollment.
 #  #
 #   PushFile:  Called to do an administrative push of a file.  # Formal Parameters:
 #              - Ensure the file being pushed is one we support.  #    $cmd      - The command that got us dispatched.
 #              - Backup the old file to <filename.saved>  #    $tail     - The tail of the command.  In our case this is a colon 
 #              - Separate the contents of the new file out from the  #                separated list that will be split into:
 #                rest of the request.  #                $filename - The name of the file to remove.
 #              - Write the new file.  #                            The filename is given as a path relative to
 #  Parameter:  #                            the LonCAPA temp file directory.
 #     Request - The entire user request.  This consists of a : separated  #    $client   - Socket open on the client.
 #               string pushfile:tablename:contents.  
 #     NOTE:  The contents may have :'s in it as well making things a bit  
 #            more interesting... but not much.  
 #  Returns:  
 #     String to send to client ("ok" or "refused" if bad file).  
 #  #
 sub PushFile {  # Returns:
     my $request = shift;      #   1     - Continue processing.
     my ($command, $filename, $contents) = split(":", $request, 3);  sub retrieve_auto_file_handler {
       my ($cmd, $tail, $client)    = @_;
       my $userinput                = "cmd:$tail";
   
       my ($filename)   = split(/:/, $tail);
   
       my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
       if ( (-e $source) && ($filename ne '') ) {
    my $reply = '';
    if (open(my $fh,$source)) {
       while (<$fh>) {
    chomp($_);
    $_ =~ s/^\s+//g;
    $_ =~ s/\s+$//g;
    $reply .= $_;
       }
       close($fh);
       &Reply($client, &escape($reply)."\n", $userinput);
   
   #   Does this have to be uncommented??!?  (RF).
   #
   #                                unlink($source);
    } else {
       &Failure($client, "error\n", $userinput);
    }
       } else {
    &Failure($client, "error\n", $userinput);
       }
           
     #  At this point in time, pushes for only the following tables are  
     #  supported:  
     #   hosts.tab  ($filename eq host).  
     #   domain.tab ($filename eq domain).  
     # Construct the destination filename or reject the request.  
     #  
     # lonManage is supposed to ensure this, however this session could be  
     # part of some elaborate spoof that managed somehow to authenticate.  
     #  
   
       return 1;
   }
   &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
   
     my $tablefile = ConfigFileFromSelector($filename);  #
     if(! (defined $tablefile)) {  #   Read and retrieve institutional code format (for support form).
  return "refused";  # Formal Parameters:
     }  #    $cmd        - Command that dispatched us.
     #  #    $tail       - Tail of the command.  In this case it conatins 
     # >copy< the old table to the backup table  #                  the course domain and the coursename.
     #        don't rename in case system crashes/reboots etc. in the time  #    $client     - Socket open on the client.
     #        window between a rename and write.  # Returns:
     #  #    1     - Continue processing.
     my $backupfile = $tablefile;  #
     $backupfile    =~ s/\.tab$/.old/;  sub get_institutional_code_format_handler {
     if(!CopyFile($tablefile, $backupfile)) {      my ($cmd, $tail, $client)   = @_;
  &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");      my $userinput               = "$cmd:$tail";
  return "error:$!";  
       my $reply;
       my($cdom,$course) = split(/:/,$tail);
       my @pairs = split/\&/,$course;
       my %instcodes = ();
       my %codes = ();
       my @codetitles = ();
       my %cat_titles = ();
       my %cat_order = ();
       foreach (@pairs) {
    my ($key,$value) = split/=/,$_;
    $instcodes{&unescape($key)} = &unescape($value);
       }
       my $formatreply = &localenroll::instcode_format($cdom,
       \%instcodes,
       \%codes,
       \@codetitles,
       \%cat_titles,
       \%cat_order);
       if ($formatreply eq 'ok') {
    my $codes_str = &Apache::lonnet::hash2str(%codes);
    my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
    my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
    my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
    &Reply($client,
          $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
          .$cat_order_str."\n",
          $userinput);
       } else {
    # this else branch added by RF since if not ok, lonc will
    # hang waiting on reply until timeout.
    #
    &Reply($client, "format_error\n", $userinput);
     }      }
     &logthis('<font color="green"> Pushfile: backed up '  
     .$tablefile." to $backupfile</font>");  
           
     #  If the file being pushed is the host file, we adjust the entry for ourself so that the      return 1;
     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible  }
     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a   &register_handler("autoinstcodeformat",
     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)    \&get_institutional_code_format_handler,0,1,0);
     #  that possibilty.  
   
     if($filename eq "host") {  sub get_institutional_defaults_handler {
  $contents = AdjustHostContents($contents);      my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
   
       my $dom = $tail;
       my %defaults_hash;
       my @code_order;
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
                                                      \@code_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               while (my ($key,$value) = each(%defaults_hash)) {
                   $result.=&escape($key).'='.&escape($value).'&';
               }
               $result .= 'code_order='.&escape(join('&',@code_order));
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
     }      }
   }
   &register_handler("autoinstcodedefaults",
                     \&get_institutional_defaults_handler,0,1,0);
   
     #  Install the new file:  sub get_institutional_user_rules {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $dom = &unescape($tail);
       my (%rules_hash,@rules_order);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::username_rules($dom,\%rules_hash,\@rules_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result;
               foreach my $key (keys(%rules_hash)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
               }
               $result =~ s/\&$//;
               $result .= ':';
               if (@rules_order > 0) {
                   foreach my $item (@rules_order) {
                       $result .= &escape($item).'&';
                   }
               }
               $result =~ s/\&$//;
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instuserrules",\&get_institutional_user_rules,0,1,0);
   
     if(!InstallFile($tablefile, $contents)) {  sub get_institutional_id_rules {
  &logthis('<font color="red"> Pushfile: unable to install '      my ($cmd, $tail, $client)   = @_;
  .$tablefile." $! </font>");      my $userinput               = "$cmd:$tail";
  return "error:$!";      my $dom = &unescape($tail);
       my (%rules_hash,@rules_order);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::id_rules($dom,\%rules_hash,\@rules_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result;
               foreach my $key (keys(%rules_hash)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
               }
               $result =~ s/\&$//;
               $result .= ':';
               if (@rules_order > 0) {
                   foreach my $item (@rules_order) {
                       $result .= &escape($item).'&';
                   }
               }
               $result =~ s/\&$//;
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
     }      }
     else {  }
  &logthis('<font color="green"> Installed new '.$tablefile  &register_handler("instidrules",\&get_institutional_id_rules,0,1,0);
  ."</font>");  
   
   sub get_institutional_selfcreate_rules {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $dom = &unescape($tail);
       my (%rules_hash,@rules_order);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::selfcreate_rules($dom,\%rules_hash,\@rules_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result;
               foreach my $key (keys(%rules_hash)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
               }
               $result =~ s/\&$//;
               $result .= ':';
               if (@rules_order > 0) {
                   foreach my $item (@rules_order) {
                       $result .= &escape($item).'&';
                   }
               }
               $result =~ s/\&$//;
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
     }      }
   }
   &register_handler("instemailrules",\&get_institutional_selfcreate_rules,0,1,0);
   
   
     #  Indicate success:  sub institutional_username_check {
        my ($cmd, $tail, $client)   = @_;
     return "ok";      my $userinput               = "$cmd:$tail";
       my %rulecheck;
       my $outcome;
       my ($udom,$uname,@rules) = split(/:/,$tail);
       $udom = &unescape($udom);
       $uname = &unescape($uname);
       @rules = map {&unescape($_);} (@rules);
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::username_check($udom,$uname,\@rules,\%rulecheck);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               foreach my $key (keys(%rulecheck)) {
                   $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
               }
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instrulecheck",\&institutional_username_check,0,1,0);
   
   sub institutional_id_check {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my %rulecheck;
       my $outcome;
       my ($udom,$id,@rules) = split(/:/,$tail);
       $udom = &unescape($udom);
       $id = &unescape($id);
       @rules = map {&unescape($_);} (@rules);
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::id_check($udom,$id,\@rules,\%rulecheck);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               foreach my $key (keys(%rulecheck)) {
                   $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
               }
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
 }  }
   &register_handler("instidrulecheck",\&institutional_id_check,0,1,0);
   
   sub institutional_selfcreate_check {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my %rulecheck;
       my $outcome;
       my ($udom,$email,@rules) = split(/:/,$tail);
       $udom = &unescape($udom);
       $email = &unescape($email);
       @rules = map {&unescape($_);} (@rules);
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::selfcreate_check($udom,$email,\@rules,\%rulecheck);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               foreach my $key (keys(%rulecheck)) {
                   $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
               }
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instselfcreatecheck",\&institutional_selfcreate_check,0,1,0);
   
   # Get domain specific conditions for import of student photographs to a course
 #  #
 #  Called to re-init either lonc or lond.  # Retrieves information from photo_permission subroutine in localenroll.
 #  # Returns outcome (ok) if no processing errors, and whether course owner is 
 #  Parameters:  # required to accept conditions of use (yes/no).
 #    request   - The full request by the client.  This is of the form  #
 #                reinit:<process>    #    
 #                where <process> is allowed to be either of   sub photo_permission_handler {
 #                lonc or lond      my ($cmd, $tail, $client)   = @_;
 #      my $userinput               = "$cmd:$tail";
 #  Returns:      my $cdom = $tail;
 #     The string to be sent back to the client either:      my ($perm_reqd,$conditions);
 #   ok         - Everything worked just fine.      my $outcome;
 #   error:why  - There was a failure and why describes the reason.      eval {
    local($SIG{__DIE__})='DEFAULT';
    $outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
     \$conditions);
       };
       if (!$@) {
    &Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
          $userinput);
       } else {
    &Failure($client,"unknown_cmd\n",$userinput);
       }
       return 1;
   }
   &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
   
 #  #
   # Checks if student photo is available for a user in the domain, in the user's
   # directory (in /userfiles/internal/studentphoto.jpg).
   # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
   # the student's photo.   
   
   sub photo_check_handler {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my ($udom,$uname,$pid) = split(/:/,$tail);
       $udom = &unescape($udom);
       $uname = &unescape($uname);
       $pid = &unescape($pid);
       my $path=&propath($udom,$uname).'/userfiles/internal/';
       if (!-e $path) {
           &mkpath($path);
       }
       my $response;
       my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
       $result .= ':'.$response;
       &Reply($client, &escape($result)."\n",$userinput);
       return 1;
   }
   &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
   
 #  #
 sub ReinitProcess {  # Retrieve information from localenroll about whether to provide a button     
     my $request = shift;  # for users who have enbled import of student photos to initiate an 
   # update of photo files for registered students. Also include 
   # comment to display alongside button.  
   
   sub photo_choice_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput             = "$cmd:$tail";
       my $cdom                  = &unescape($tail);
       my ($update,$comment);
       eval {
    local($SIG{__DIE__})='DEFAULT';
    ($update,$comment)    = &localenroll::manager_photo_update($cdom);
       };
       if (!$@) {
    &Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
       } else {
    &Failure($client,"unknown_cmd\n",$userinput);
       }
       return 1;
   }
   &register_handler("autophotochoice",\&photo_choice_handler,0,1,0);
   
   #
   # Gets a student's photo to exist (in the correct image type) in the user's 
   # directory.
   # Formal Parameters:
   #    $cmd     - The command request that got us dispatched.
   #    $tail    - A colon separated set of words that will be split into:
   #               $domain - student's domain
   #               $uname  - student username
   #               $type   - image type desired
   #    $client  - The socket open on the client.
   # Returns:
   #    1 - continue processing.
   
     # separate the request (reinit) from the process identifier and  sub student_photo_handler {
     # validate it producing the name of the .pid file for the process.      my ($cmd, $tail, $client) = @_;
     #      my ($domain,$uname,$ext,$type) = split(/:/, $tail);
     #  
     my ($junk, $process) = split(":", $request);      my $path=&propath($domain,$uname). '/userfiles/internal/';
     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';      my $filename = 'studentphoto.'.$ext;
     if($process eq 'lonc') {      if ($type eq 'thumbnail') {
  $processpidfile = $processpidfile."lonc.pid";          $filename = 'studentphoto_tn.'.$ext;
  if (!open(PIDFILE, "< $processpidfile")) {      }
     return "error:Open failed for $processpidfile";      if (-e $path.$filename) {
  }   &Reply($client,"ok\n","$cmd:$tail");
  my $loncpid = <PIDFILE>;   return 1;
  close(PIDFILE);      }
  logthis('<font color="red"> Reinitializing lonc pid='.$loncpid      &mkpath($path);
  ."</font>");      my $file;
  kill("USR2", $loncpid);      if ($type eq 'thumbnail') {
     } elsif ($process eq 'lond') {   eval {
  logthis('<font color="red"> Reinitializing self (lond) </font>');      local($SIG{__DIE__})='DEFAULT';
  &UpdateHosts; # Lond is us!!      $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
    };
     } else {      } else {
  &logthis('<font color="yellow" Invalid reinit request for '.$process          $file=&localstudentphoto::fetch($domain,$uname);
  ."</font>");  
  return "error:Invalid process identifier $process";  
     }      }
     return 'ok';      if (!$file) {
    &Failure($client,"unavailable\n","$cmd:$tail");
    return 1;
       }
       if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
       if (-e $path.$filename) {
    &Reply($client,"ok\n","$cmd:$tail");
    return 1;
       }
       &Failure($client,"unable_to_convert\n","$cmd:$tail");
       return 1;
 }  }
 #   Validate a line in a configuration file edit script:  &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
 #   Validation includes:  
 #     - Ensuring the command is valid.  
 #     - Ensuring the command has sufficient parameters  
 #   Parameters:  
 #     scriptline - A line to validate (\n has been stripped for what it's worth).  
 #  
 #   Return:  
 #      0     - Invalid scriptline.  
 #      1     - Valid scriptline  
 #  NOTE:  
 #     Only the command syntax is checked, not the executability of the  
 #     command.  
 #  
 sub isValidEditCommand {  
     my $scriptline = shift;  
   
     #   Line elements are pipe separated:  sub inst_usertypes_handler {
       my ($cmd, $domain, $client) = @_;
       my $res;
       my $userinput = $cmd.":".$domain; # For logging purposes.
       my (%typeshash,@order,$result);
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
       };
       if ($result eq 'ok') {
           if (keys(%typeshash) > 0) {
               foreach my $key (keys(%typeshash)) {
                   $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
               }
           }
           $res=~s/\&$//;
           $res .= ':';
           if (@order > 0) {
               foreach my $item (@order) {
                   $res .= &escape($item).'&';
               }
           }
           $res=~s/\&$//;
       }
       &Reply($client, \$res, $userinput);
       return 1;
   }
   &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
   
     my ($command, $key, $newline)  = split(/\|/, $scriptline);  # mkpath makes all directories for a file, expects an absolute path with a
     &logthis('<font color="green"> isValideditCommand checking: '.  # file or a trailing / if just a dir is passed
      "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");  # returns 1 on success 0 on failure
       sub mkpath {
     if ($command eq "delete") {      my ($file)=@_;
  #      my @parts=split(/\//,$file,-1);
  #   key with no newline.      my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
  #      for (my $i=3;$i<= ($#parts-1);$i++) {
  if( ($key eq "") || ($newline ne "")) {   $now.='/'.$parts[$i]; 
     return 0; # Must have key but no newline.   if (!-e $now) {
  } else {      if  (!mkdir($now,0770)) { return 0; }
     return 1; # Valid syntax.  
  }  
     } elsif ($command eq "replace") {  
  #  
  #   key and newline:  
  #  
  if (($key eq "") || ($newline eq "")) {  
     return 0;  
  } else {  
     return 1;  
  }  
     } elsif ($command eq "append") {  
  if (($key ne "") && ($newline eq "")) {  
     return 1;  
  } else {  
     return 0;  
  }   }
     } else {  
  return 0; # Invalid command.  
     }      }
     return 0; # Should not get here!!!      return 1;
 }  }
   
   #---------------------------------------------------------------
 #  #
 #   ApplyEdit - Applies an edit command to a line in a configuration   #   Getting, decoding and dispatching requests:
 #               file.  It is the caller's responsiblity to validate the  
 #               edit line.  
 #   Parameters:  
 #      $directive - A single edit directive to apply.    
 #                   Edit directives are of the form:  
 #                  append|newline      - Appends a new line to the file.  
 #                  replace|key|newline - Replaces the line with key value 'key'  
 #                  delete|key          - Deletes the line with key value 'key'.  
 #      $editor   - A config file editor object that contains the  
 #                  file being edited.  
 #  #
 sub ApplyEdit {  #
     my $directive   = shift;  #   Get a Request:
     my $editor      = shift;  #   Gets a Request message from the client.  The transaction
   #   is defined as a 'line' of text.  We remove the new line
   #   from the text line.  
   #
   sub get_request {
       my $input = <$client>;
       chomp($input);
   
     # Break the directive down into its command and its parameters      &Debug("get_request: Request = $input\n");
     # (at most two at this point.  The meaning of the parameters, if in fact  
     #  they exist depends on the command).  
   
     my ($command, $p1, $p2) = split(/\|/, $directive);      &status('Processing '.$clientname.':'.$input);
   
     if($command eq "append") {      return $input;
  $editor->Append($p1);          # p1 - key p2 null.  
     } elsif ($command eq "replace") {  
  $editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.  
     } elsif ($command eq "delete") {  
  $editor->DeleteLine($p1);         # p1 - key p2 null.  
     } else {          # Should not get here!!!  
  die "Invalid command given to ApplyEdit $command"  
     }  
 }  }
   #---------------------------------------------------------------
 #  #
 # AdjustOurHost:  #  Process a request.  This sub should shrink as each action
 #           Adjusts a host file stored in a configuration file editor object  #  gets farmed out into a separat sub that is registered 
 #           for the true IP address of this host. This is necessary for hosts  #  with the dispatch hash.  
 #           that live behind a firewall.  #
 #           Those hosts have a publicly distributed IP of the firewall, but  # Parameters:
 #           internally must use their actual IP.  We assume that a given  #    user_input   - The request received from the client (lonc).
 #           host only has a single IP interface for now.  # Returns:
 # Formal Parameters:  #    true to keep processing, false if caller should exit.
 #     editor   - The configuration file editor to adjust.  This  #
 #                editor is assumed to contain a hosts.tab file.  sub process_request {
 # Strategy:      my ($userinput) = @_;      # Easier for now to break style than to
 #    - Figure out our hostname.                                  # fix all the userinput -> user_input.
 #    - Lookup the entry for this host.      my $wasenc    = 0; # True if request was encrypted.
 #    - Modify the line to contain our IP  # ------------------------------------------------------------ See if encrypted
 #    - Do a replace for this host.      # for command
 sub AdjustOurHost {      # sethost:<server>
     my $editor        = shift;      # <command>:<args>
       #   we just send it to the processor
     # figure out who I am.      # for
       # sethost:<server>:<command>:<args>
       #  we do the implict set host and then do the command
       if ($userinput =~ /^sethost:/) {
    (my $cmd,my $newid,$userinput) = split(':',$userinput,3);
    if (defined($userinput)) {
       &sethost("$cmd:$newid");
    } else {
       $userinput = "$cmd:$newid";
    }
       }
   
     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.      if ($userinput =~ /^enc/) {
    $userinput = decipher($userinput);
    $wasenc=1;
    if(!$userinput) { # Cipher not defined.
       &Failure($client, "error: Encrypted data without negotated key\n");
       return 0;
    }
       }
       Debug("process_request: $userinput\n");
       
       #  
       #   The 'correct way' to add a command to lond is now to
       #   write a sub to execute it and Add it to the command dispatch
       #   hash via a call to register_handler..  The comments to that
       #   sub should give you enough to go on to show how to do this
       #   along with the examples that are building up as this code
       #   is getting refactored.   Until all branches of the
       #   if/elseif monster below have been factored out into
       #   separate procesor subs, if the dispatch hash is missing
       #   the command keyword, we will fall through to the remainder
       #   of the if/else chain below in order to keep this thing in 
       #   working order throughout the transmogrification.
   
       my ($command, $tail) = split(/:/, $userinput, 2);
       chomp($command);
       chomp($tail);
       $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
       $command =~ s/(\r)//; # And this too for parameterless commands.
       if(!$tail) {
    $tail =""; # defined but blank.
       }
   
       &Debug("Command received: $command, encoded = $wasenc");
   
       if(defined $Dispatcher{$command}) {
   
    my $dispatch_info = $Dispatcher{$command};
    my $handler       = $$dispatch_info[0];
    my $need_encode   = $$dispatch_info[1];
    my $client_types  = $$dispatch_info[2];
    Debug("Matched dispatch hash: mustencode: $need_encode "
         ."ClientType $client_types");
         
    #  Validate the request:
         
    my $ok = 1;
    my $requesterprivs = 0;
    if(&isClient()) {
       $requesterprivs |= $CLIENT_OK;
    }
    if(&isManager()) {
       $requesterprivs |= $MANAGER_OK;
    }
    if($need_encode && (!$wasenc)) {
       Debug("Must encode but wasn't: $need_encode $wasenc");
       $ok = 0;
    }
    if(($client_types & $requesterprivs) == 0) {
       Debug("Client not privileged to do this operation");
       $ok = 0;
    }
   
     #  Get my host file entry.   if($ok) {
       Debug("Dispatching to handler $command $tail");
       my $keep_going = &$handler($command, $tail, $client);
       return $keep_going;
    } else {
       Debug("Refusing to dispatch because client did not match requirements");
       Failure($client, "refused\n", $userinput);
       return 1;
    }
   
     my $ConfigLine    = $editor->Find($myHostName);      }    
     if(! (defined $ConfigLine)) {  
  die "AdjustOurHost - no entry for me in hosts file $myHostName";  
     }  
     # figure out my IP:  
     #   Use the config line to get my hostname.  
     #   Use gethostbyname to translate that into an IP address.  
     #  
     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);  
     my $BinaryIp = gethostbyname($name);  
     my $ip       = inet_ntoa($ip);  
     #  
     #  Reassemble the config line from the elements in the list.  
     #  Note that if the loncnew items were not present before, they will  
     #  be now even if they would be empty  
     #  
     my $newConfigLine = $id;  
     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {  
  $newConfigLine .= ":".$item;  
     }  
     #  Replace the line:  
   
     $editor->ReplaceLine($id, $newConfigLine);      print $client "unknown_cmd\n";
       # -------------------------------------------------------------------- complete
       Debug("process_request - returning 1");
       return 1;
 }  }
 #  #
 #   ReplaceConfigFile:  #   Decipher encoded traffic
 #              Replaces a configuration file with the contents of a  #  Parameters:
 #              configuration file editor object.  #     input      - Encoded data.
 #              This is done by:  #  Returns:
 #              - Copying the target file to <filename>.old  #     Decoded data or undef if encryption key was not yet negotiated.
 #              - Writing the new file to <filename>.tmp  #  Implicit input:
 #              - Moving <filename.tmp>  -> <filename>  #     cipher  - This global holds the negotiated encryption key.
 #              This laborious process ensures that the system is never without  
 #              a configuration file that's at least valid (even if the contents  
 #              may be dated).  
 #   Parameters:  
 #        filename   - Name of the file to modify... this is a full path.  
 #        editor     - Editor containing the file.  
 #  #
 sub ReplaceConfigFile {  sub decipher {
     my $filename  = shift;      my ($input)  = @_;
     my $editor    = shift;      my $output = '';
       
     CopyFile ($filename, $filename.".old");      
       if($cipher) {
     my $contents  = $editor->Get(); # Get the contents of the file.   my($enc, $enclength, $encinput) = split(/:/, $input);
    for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
     InstallFile($filename, $contents);      $output .= 
    $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
    }
    return substr($output, 0, $enclength);
       } else {
    return undef;
       }
 }  }
 #     
 #  #
 #   Called to edit a configuration table  file  #   Register a command processor.  This function is invoked to register a sub
   #   to process a request.  Once registered, the ProcessRequest sub can automatically
   #   dispatch requests to an appropriate sub, and do the top level validity checking
   #   as well:
   #    - Is the keyword recognized.
   #    - Is the proper client type attempting the request.
   #    - Is the request encrypted if it has to be.
 #   Parameters:  #   Parameters:
 #      request           - The entire command/request sent by lonc or lonManage  #    $request_name         - Name of the request being registered.
 #   Return:  #                           This is the command request that will match
 #      The reply to send to the client.  #                           against the hash keywords to lookup the information
   #                           associated with the dispatch information.
   #    $procedure           - Reference to a sub to call to process the request.
   #                           All subs get called as follows:
   #                             Procedure($cmd, $tail, $replyfd, $key)
   #                             $cmd    - the actual keyword that invoked us.
   #                             $tail   - the tail of the request that invoked us.
   #                             $replyfd- File descriptor connected to the client
   #    $must_encode          - True if the request must be encoded to be good.
   #    $client_ok            - True if it's ok for a client to request this.
   #    $manager_ok           - True if it's ok for a manager to request this.
   # Side effects:
   #      - On success, the Dispatcher hash has an entry added for the key $RequestName
   #      - On failure, the program will die as it's a bad internal bug to try to 
   #        register a duplicate command handler.
 #  #
 sub EditFile {  sub register_handler {
     my $request = shift;      my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok)   = @_;
   
     #  Split the command into it's pieces:  edit:filetype:script  
   
     my ($request, $filetype, $script) = split(/:/, $request,3); # : in script  
   
     #  Check the pre-coditions for success:  
   
     if($request != "edit") { # Something is amiss afoot alack.      #  Don't allow duplication#
  return "error:edit request detected, but request != 'edit'\n";     
       if (defined $Dispatcher{$request_name}) {
    die "Attempting to define a duplicate request handler for $request_name\n";
     }      }
     if( ($filetype ne "hosts")  &&      #   Build the client type mask:
  ($filetype ne "domain")) {      
  return "error:edit requested with invalid file specifier: $filetype \n";      my $client_type_mask = 0;
       if($client_ok) {
    $client_type_mask  |= $CLIENT_OK;
     }      }
       if($manager_ok) {
    $client_type_mask  |= $MANAGER_OK;
       }
      
       #  Enter the hash:
         
       my @entry = ($procedure, $must_encode, $client_type_mask);
      
       $Dispatcher{$request_name} = \@entry;
      
   }
   
     #   Split the edit script and check it's validity.  
   
     my @scriptlines = split(/\n/, $script);  # one line per element.  #------------------------------------------------------------------
     my $linecount   = scalar(@scriptlines);  
     for(my $i = 0; $i < $linecount; $i++) {  
  chomp($scriptlines[$i]);  
  if(!isValidEditCommand($scriptlines[$i])) {  
     return "error:edit with bad script line: '$scriptlines[$i]' \n";  
  }  
     }  
   
     #   Execute the edit operation.  
     #   - Create a config file editor for the appropriate file and   
     #   - execute each command in the script:  
     #  
     my $configfile = ConfigFileFromSelector($filetype);  
     if (!(defined $configfile)) {  
  return "refused\n";  
     }  
     my $editor = ConfigFileEdit->new($configfile);  
   
     for (my $i = 0; $i < $linecount; $i++) {  
  ApplyEdit($scriptlines[$i], $editor);  
     }  
     # If the file is the host file, ensure that our host is  
     # adjusted to have our ip:  
     #  
     if($filetype eq "host") {  
  AdjustOurHost($editor);  
     }  
     #  Finally replace the current file with our file.  
     #  
     ReplaceConfigFile($configfile, $editor);  
   
     return "ok\n";  
 }  
 #  #
 #  Convert an error return code from lcpasswd to a string value.  #  Convert an error return code from lcpasswd to a string value.
 #  #
Line 3249  sub catchexception { Line 5507  sub catchexception {
     $SIG{'QUIT'}='DEFAULT';      $SIG{'QUIT'}='DEFAULT';
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
     &status("Catching exception");      &status("Catching exception");
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color='red'>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "       ."ABNORMAL EXIT. Child $$ for server ".$perlvar{'lonHostID'}." died through "
      ."a crash with this error msg->[$error]</font>");       ."a crash with this error msg->[$error]</font>");
     &logthis('Famous last words: '.$status.' - '.$lastlog);      &logthis('Famous last words: '.$status.' - '.$lastlog);
     if ($client) { print $client "error: $error\n"; }      if ($client) { print $client "error: $error\n"; }
     $server->close();      $server->close();
     die($error);      die($error);
 }  }
   
 sub timeout {  sub timeout {
     &status("Handling Timeout");      &status("Handling Timeout");
     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
     &catchexception('Timeout');      &catchexception('Timeout');
 }  }
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
   
   
 $SIG{'QUIT'}=\&catchexception;  $SIG{'QUIT'}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   
Line 3312  $server = IO::Socket::INET->new(LocalPor Line 5570  $server = IO::Socket::INET->new(LocalPor
 # global variables  # global variables
   
 my %children               = ();       # keys are current child process IDs  my %children               = ();       # keys are current child process IDs
 my $children               = 0;        # current number of children  
   
 sub REAPER {                        # takes care of dead children  sub REAPER {                        # takes care of dead children
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     &status("Handling child death");      &status("Handling child death");
     my $pid = wait;      my $pid;
     if (defined($children{$pid})) {      do {
  &logthis("Child $pid died");   $pid = waitpid(-1,&WNOHANG());
  $children --;   if (defined($children{$pid})) {
  delete $children{$pid};      &logthis("Child $pid died");
     } else {      delete($children{$pid});
  &logthis("Unknown Child $pid died");   } elsif ($pid > 0) {
       &logthis("Unknown Child $pid died");
    }
       } while ( $pid > 0 );
       foreach my $child (keys(%children)) {
    $pid = waitpid($child,&WNOHANG());
    if ($pid > 0) {
       &logthis("Child $child - $pid looks like we missed it's death");
       delete($children{$pid});
    }
     }      }
     &status("Finished Handling child death");      &status("Finished Handling child death");
 }  }
Line 3335  sub HUNTSMAN {                      # si Line 5601  sub HUNTSMAN {                      # si
     &logthis("Free socket: ".shutdown($server,2)); # free up socket      &logthis("Free socket: ".shutdown($server,2)); # free up socket
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unlink("$execdir/logs/lond.pid");      unlink("$execdir/logs/lond.pid");
     &logthis("<font color=red>CRITICAL: Shutting down</font>");      &logthis("<font color='red'>CRITICAL: Shutting down</font>");
     &status("Done killing children");      &status("Done killing children");
     exit;                           # clean up with dignity      exit;                           # clean up with dignity
 }  }
Line 3345  sub HUPSMAN {                      # sig Line 5611  sub HUPSMAN {                      # sig
     &status("Killing children for restart (HUP)");      &status("Killing children for restart (HUP)");
     kill 'INT' => keys %children;      kill 'INT' => keys %children;
     &logthis("Free socket: ".shutdown($server,2)); # free up socket      &logthis("Free socket: ".shutdown($server,2)); # free up socket
     &logthis("<font color=red>CRITICAL: Restarting</font>");      &logthis("<font color='red'>CRITICAL: Restarting</font>");
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unlink("$execdir/logs/lond.pid");      unlink("$execdir/logs/lond.pid");
     &status("Restarting self (HUP)");      &status("Restarting self (HUP)");
Line 3353  sub HUPSMAN {                      # sig Line 5619  sub HUPSMAN {                      # sig
 }  }
   
 #  #
 #    Kill off hashes that describe the host table prior to re-reading it.  
 #    Hashes affected are:  
 #       %hostid, %hostdom %hostip  
 #  
 sub KillHostHashes {  
     foreach my $key (keys %hostid) {  
  delete $hostid{$key};  
     }  
     foreach my $key (keys %hostdom) {  
  delete $hostdom{$key};  
     }  
     foreach my $key (keys %hostip) {  
  delete $hostip{$key};  
     }  
 }  
 #  
 #   Read in the host table from file and distribute it into the various hashes:  
 #  
 #    - %hostid  -  Indexed by IP, the loncapa hostname.  
 #    - %hostdom -  Indexed by  loncapa hostname, the domain.  
 #    - %hostip  -  Indexed by hostid, the Ip address of the host.  
 sub ReadHostTable {  
   
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";  
       
     while (my $configline=<CONFIG>) {  
  my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);  
  chomp($ip); $ip=~s/\D+$//;  
  $hostid{$ip}=$id;  
  $hostdom{$id}=$domain;  
  $hostip{$id}=$ip;  
  if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }  
     }  
     close(CONFIG);  
 }  
 #  
 #  Reload the Apache daemon's state.  #  Reload the Apache daemon's state.
 #  This is done by invoking /home/httpd/perl/apachereload  #  This is done by invoking /home/httpd/perl/apachereload
 #  a setuid perl script that can be root for us to do this job.  #  a setuid perl script that can be root for us to do this job.
Line 3419  sub UpdateHosts { Line 5649  sub UpdateHosts {
     #  either dropped or changed hosts.  Note that the re-read of the table      #  either dropped or changed hosts.  Note that the re-read of the table
     #  will take care of new and changed hosts as connections come into being.      #  will take care of new and changed hosts as connections come into being.
   
       &Apache::lonnet::reset_hosts_info();
   
     KillHostHashes;      foreach my $child (keys(%children)) {
     ReadHostTable;  
   
     foreach my $child (keys %children) {  
  my $childip = $children{$child};   my $childip = $children{$child};
  if(!$hostid{$childip}) {   if ($childip ne '127.0.0.1'
       && !defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
     logthis('<font color="blue"> UpdateHosts killing child '      logthis('<font color="blue"> UpdateHosts killing child '
     ." $child for ip $childip </font>");      ." $child for ip $childip </font>");
     kill('INT', $child);      kill('INT', $child);
Line 3446  sub checkchildren { Line 5675  sub checkchildren {
     &logthis('Going to check on the children');      &logthis('Going to check on the children');
     my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
     foreach (sort keys %children) {      foreach (sort keys %children) {
  sleep 1;   #sleep 1;
         unless (kill 'USR1' => $_) {          unless (kill 'USR1' => $_) {
     &logthis ('Child '.$_.' is dead');      &logthis ('Child '.$_.' is dead');
             &logstatus($$.' is dead');              &logstatus($$.' is dead');
       delete($children{$_});
         }           } 
     }      }
     sleep 5;      sleep 5;
     $SIG{ALRM} = sub { die "timeout" };      $SIG{ALRM} = sub { Debug("timeout"); 
          die "timeout";  };
     $SIG{__DIE__} = 'DEFAULT';      $SIG{__DIE__} = 'DEFAULT';
     &status("Checking on the children (waiting for reports)");      &status("Checking on the children (waiting for reports)");
     foreach (sort keys %children) {      foreach (sort keys %children) {
Line 3467  sub checkchildren { Line 5698  sub checkchildren {
     #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;      #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
     #$execdir=$perlvar{'lonDaemons'};      #$execdir=$perlvar{'lonDaemons'};
     #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;      #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
       delete($children{$_});
     alarm(0);      alarm(0);
   }    }
         }          }
Line 3474  sub checkchildren { Line 5706  sub checkchildren {
     $SIG{ALRM} = 'DEFAULT';      $SIG{ALRM} = 'DEFAULT';
     $SIG{__DIE__} = \&catchexception;      $SIG{__DIE__} = \&catchexception;
     &status("Finished checking children");      &status("Finished checking children");
       &logthis('Finished Checking children');
 }  }
   
 # --------------------------------------------------------------------- Logging  # --------------------------------------------------------------------- Logging
Line 3504  sub Debug { Line 5737  sub Debug {
 #     reply   - Text to send to client.  #     reply   - Text to send to client.
 #     request - Original request from client.  #     request - Original request from client.
 #  #
 #  Note: This increments Transactions  
 #  
 sub Reply {  sub Reply {
     alarm(120);      my ($fd, $reply, $request) = @_;
     my $fd      = shift;      if (ref($reply)) {
     my $reply   = shift;   print $fd $$reply;
     my $request = shift;   print $fd "\n";
    if ($DEBUG) { Debug("Request was $request  Reply was $$reply"); }
     print $fd $reply;      } else {
     Debug("Request was $request  Reply was $reply");   print $fd $reply;
    if ($DEBUG) { Debug("Request was $request  Reply was $reply"); }
       }
     $Transactions++;      $Transactions++;
     alarm(0);  }
   
   
 }  
 #  #
 #    Sub to report a failure.  #    Sub to report a failure.
 #    This function:  #    This function:
Line 3536  sub Reply { Line 5767  sub Reply {
 #    client:  #    client:
 #  #
 sub Failure {  sub Failure {
    my $fd      = shift;      my $fd      = shift;
    my $reply   = shift;      my $reply   = shift;
    my $request = shift;      my $request = shift;
         
    $Failures++;      $Failures++;
    Reply($fd, $reply, $request);      # That's simple eh?      Reply($fd, $reply, $request);      # That's simple eh?
 }  }
 # ------------------------------------------------------------------ Log status  # ------------------------------------------------------------------ Log status
   
 sub logstatus {  sub logstatus {
    &status("Doing logging");      &status("Doing logging");
    my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
    {      {
       my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");   my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
       print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";          print $fh $status."\n".$lastlog."\n".time."\n$keymode";
       $fh->close();          $fh->close();
    }      }
    &status("Finished londstatus.txt");      &status("Finished $$.txt");
    {      {
       my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");   open(LOG,">>$docdir/lon-status/londstatus.txt");
       print $fh $status."\n".$lastlog."\n".time;   flock(LOG,LOCK_EX);
       $fh->close();   print LOG $$."\t".$clientname."\t".$currenthostid."\t"
    }      .$status."\t".$lastlog."\t $keymode\n";
    ResetStatistics;   flock(LOG,LOCK_UN);
    &status("Finished logging");   close(LOG);
          }
       &status("Finished logging");
 }  }
   
 sub initnewstatus {  sub initnewstatus {
Line 3583  sub status { Line 5815  sub status {
     my $what=shift;      my $what=shift;
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $status = "lond: $what $local ";      $status=$local.': '.$what;
     if($Transactions) {      $0='lond: '.$what.' '.$local;
        $status .= " Transactions: $Transactions Failed; $Failures";  
     }  
     $0=$status;  
 }  
   
 # -------------------------------------------------------- Escape Special Chars  
   
 sub escape {  
     my $str=shift;  
     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;  
     return $str;  
 }  
   
 # ----------------------------------------------------- Un-Escape Special Chars  
   
 sub unescape {  
     my $str=shift;  
     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;  
     return $str;  
 }  
   
 # ----------------------------------------------------------- Send USR1 to lonc  
   
 sub reconlonc {  
     my $peerfile=shift;  
     &logthis("Trying to reconnect for $peerfile");  
     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";  
     if (my $fh=IO::File->new("$loncfile")) {  
  my $loncpid=<$fh>;  
         chomp($loncpid);  
         if (kill 0 => $loncpid) {  
     &logthis("lonc at pid $loncpid responding, sending USR1");  
             kill USR1 => $loncpid;  
         } else {  
     &logthis(  
               "<font color=red>CRITICAL: "  
              ."lonc at pid $loncpid not responding, giving up</font>");  
         }  
     } else {  
       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');  
     }  
 }  
   
 # -------------------------------------------------- Non-critical communication  
   
 sub subreply {  
     my ($cmd,$server)=@_;  
     my $peerfile="$perlvar{'lonSockDir'}/$server";  
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",  
                                       Type    => SOCK_STREAM,  
                                       Timeout => 10)  
        or return "con_lost";  
     print $sclient "$cmd\n";  
     my $answer=<$sclient>;  
     chomp($answer);  
     if (!$answer) { $answer="con_lost"; }  
     return $answer;  
 }  
   
 sub reply {  
   my ($cmd,$server)=@_;  
   my $answer;  
   if ($server ne $currenthostid) {   
     $answer=subreply($cmd,$server);  
     if ($answer eq 'con_lost') {  
  $answer=subreply("ping",$server);  
         if ($answer ne $server) {  
     &logthis("sub reply: answer != server answer is $answer, server is $server");  
            &reconlonc("$perlvar{'lonSockDir'}/$server");  
         }  
         $answer=subreply($cmd,$server);  
     }  
   } else {  
     $answer='self_reply';  
   }   
   return $answer;  
 }  }
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
   
 sub sqlreply {  sub sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $answer=subsqlreply($cmd);      my $answer=&sub_sql_reply($cmd);
     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }      if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
     return $answer;      return $answer;
 }  }
   
 sub subsqlreply {  sub sub_sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $unixsock="mysqlsock";      my $unixsock="mysqlsock";
     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";      my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
Line 3680  sub subsqlreply { Line 5836  sub subsqlreply {
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
        or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "$cmd:$currentdomainid\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
     if (!$answer) { $answer="con_lost"; }      if (!$answer) { $answer="con_lost"; }
     return $answer;      return $answer;
 }  }
   
 # -------------------------------------------- Return path to profile directory  
   
 sub propath {  
     my ($udom,$uname)=@_;  
     $udom=~s/\W//g;  
     $uname=~s/\W//g;  
     my $subdir=$uname.'__';  
     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;  
     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";  
     return $proname;  
 }   
   
 # --------------------------------------- Is this the home server of an author?  # --------------------------------------- Is this the home server of an author?
   
 sub ishome {  sub ishome {
Line 3728  my $execdir=$perlvar{'lonDaemons'}; Line 5872  my $execdir=$perlvar{'lonDaemons'};
 open (PIDSAVE,">$execdir/logs/lond.pid");  open (PIDSAVE,">$execdir/logs/lond.pid");
 print PIDSAVE "$$\n";  print PIDSAVE "$$\n";
 close(PIDSAVE);  close(PIDSAVE);
 &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");  &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
 &status('Starting');  &status('Starting');
   
   
Line 3743  $SIG{USR1} = \&checkchildren; Line 5887  $SIG{USR1} = \&checkchildren;
 $SIG{USR2} = \&UpdateHosts;  $SIG{USR2} = \&UpdateHosts;
   
 #  Read the host hashes:  #  Read the host hashes:
   &Apache::lonnet::load_hosts_tab();
   
 ReadHostTable;  my $dist=`$perlvar{'lonDaemons'}/distprobe`;
   
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated  #   Accept connections.  When a connection comes in, it is validated
Line 3762  while (1) { Line 5906  while (1) {
   
 sub make_new_child {  sub make_new_child {
     my $pid;      my $pid;
   #    my $cipher;     # Now global
     my $sigset;      my $sigset;
   
     $client = shift;      $client = shift;
Line 3783  sub make_new_child { Line 5928  sub make_new_child {
     #  the pid hash.      #  the pid hash.
     #      #
     my $caller = getpeername($client);      my $caller = getpeername($client);
     my ($port,$iaddr)=unpack_sockaddr_in($caller);      my ($port,$iaddr);
     $clientip=inet_ntoa($iaddr);      if (defined($caller) && length($caller) > 0) {
    ($port,$iaddr)=unpack_sockaddr_in($caller);
       } else {
    &logthis("Unable to determine who caller was, getpeername returned nothing");
       }
       if (defined($iaddr)) {
    $clientip  = inet_ntoa($iaddr);
    Debug("Connected with $clientip");
       } else {
    &logthis("Unable to determine clientip");
    $clientip='Unavailable';
       }
           
     if ($pid) {      if ($pid) {
         # Parent records the child's birth and returns.          # Parent records the child's birth and returns.
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
         $children{$pid} = $clientip;          $children{$pid} = $clientip;
         $children++;  
         &status('Started child '.$pid);          &status('Started child '.$pid);
         return;          return;
     } else {      } else {
Line 3808  sub make_new_child { Line 5963  sub make_new_child {
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
   
   #        my $tmpsnum=0;            # Now global
   #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
         &Authen::Krb5::init_ets();   unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||  
    ($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
       &Authen::Krb5::init_ets();
    }
   
  &status('Accepted connection');   &status('Accepted connection');
 # =============================================================================  # =============================================================================
             # do something with the connection              # do something with the connection
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
  # see if we know client and check for spoof IP by challenge   # see if we know client and 'check' for spoof IP by ineffective challenge
   
  ReadManagerTable; # May also be a manager!!   my $outsideip=$clientip;
    if ($clientip eq '127.0.0.1') {
  my $clientrec=($hostid{$clientip}     ne undef);      $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
  my $ismanager=($managers{$clientip}    ne undef);   }
   
    my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
    my $ismanager=($managers{$outsideip}    ne undef);
  $clientname  = "[unknonwn]";   $clientname  = "[unknonwn]";
  if($clientrec) { # Establish client type.   if($clientrec) { # Establish client type.
     $ConnectionType = "client";      $ConnectionType = "client";
     $clientname = $hostid{$clientip};      $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
     if($ismanager) {      if($ismanager) {
  $ConnectionType = "both";   $ConnectionType = "both";
     }      }
  } else {   } else {
     $ConnectionType = "manager";      $ConnectionType = "manager";
     $clientname = $managers{$clientip};      $clientname = $managers{$outsideip};
  }   }
  my $clientok;   my $clientok;
   
  if ($clientrec || $ismanager) {   if ($clientrec || $ismanager) {
     &status("Waiting for init from $clientip $clientname");      &status("Waiting for init from $clientip $clientname");
     &logthis('<font color="yellow">INFO: Connection, '.      &logthis('<font color="yellow">INFO: Connection, '.
Line 3842  sub make_new_child { Line 6004  sub make_new_child {
   " ($clientname) connection type = $ConnectionType </font>" );    " ($clientname) connection type = $ConnectionType </font>" );
     &status("Connecting $clientip  ($clientname))");       &status("Connecting $clientip  ($clientname))"); 
     my $remotereq=<$client>;      my $remotereq=<$client>;
     $remotereq=~s/[^\w:]//g;      chomp($remotereq);
       Debug("Got init: $remotereq");
   
     if ($remotereq =~ /^init/) {      if ($remotereq =~ /^init/) {
  &sethost("sethost:$perlvar{'lonHostID'}");   &sethost("sethost:$perlvar{'lonHostID'}");
  my $challenge="$$".time;   #
  print $client "$challenge\n";   #  If the remote is attempting a local init... give that a try:
  &status(   #
  "Waiting for challenge reply from $clientip ($clientname)");    my ($i, $inittype) = split(/:/, $remotereq);
  $remotereq=<$client>;  
  $remotereq=~s/\W//g;   # If the connection type is ssl, but I didn't get my
  if ($challenge eq $remotereq) {   # certificate files yet, then I'll drop  back to 
     $clientok=1;   # insecure (if allowed).
     print $client "ok\n";  
    if($inittype eq "ssl") {
       my ($ca, $cert) = lonssl::CertificateFile;
       my $kfile       = lonssl::KeyFile;
       if((!$ca)   || 
          (!$cert) || 
          (!$kfile)) {
    $inittype = ""; # This forces insecure attempt.
    &logthis("<font color=\"blue\"> Certificates not "
    ."installed -- trying insecure auth</font>");
       } else { # SSL certificates are in place so
       } # Leave the inittype alone.
    }
   
    if($inittype eq "local") {
       my $key = LocalConnection($client, $remotereq);
       if($key) {
    Debug("Got local key $key");
    $clientok     = 1;
    my $cipherkey = pack("H32", $key);
    $cipher       = new IDEA($cipherkey);
    print $client "ok:local\n";
    &logthis('<font color="green"'
    . "Successful local authentication </font>");
    $keymode = "local"
       } else {
    Debug("Failed to get local key");
    $clientok = 0;
    shutdown($client, 3);
    close $client;
       }
    } elsif ($inittype eq "ssl") {
       my $key = SSLConnection($client);
       if ($key) {
    $clientok = 1;
    my $cipherkey = pack("H32", $key);
    $cipher       = new IDEA($cipherkey);
    &logthis('<font color="green">'
    ."Successfull ssl authentication with $clientname </font>");
    $keymode = "ssl";
        
       } else {
    $clientok = 0;
    close $client;
       }
      
  } else {   } else {
     &logthis(      my $ok = InsecureConnection($client);
      "<font color=blue>WARNING: $clientip did not reply challenge</font>");      if($ok) {
     &status('No challenge reply '.$clientip);   $clientok = 1;
    &logthis('<font color="green">'
    ."Successful insecure authentication with $clientname </font>");
    print $client "ok\n";
    $keymode = "insecure";
       } else {
    &logthis('<font color="yellow">'
     ."Attempted insecure connection disallowed </font>");
    close $client;
    $clientok = 0;
   
       }
  }   }
     } else {      } else {
  &logthis(   &logthis(
  "<font color=blue>WARNING: "   "<font color='blue'>WARNING: "
  ."$clientip failed to initialize: >$remotereq< </font>");   ."$clientip failed to initialize: >$remotereq< </font>");
  &status('No init '.$clientip);   &status('No init '.$clientip);
     }      }
       
  } else {   } else {
     &logthis(      &logthis(
      "<font color=blue>WARNING: Unknown client $clientip</font>");       "<font color='blue'>WARNING: Unknown client $clientip</font>");
     &status('Hung up on '.$clientip);      &status('Hung up on '.$clientip);
  }   }
    
  if ($clientok) {   if ($clientok) {
 # ---------------- New known client connecting, could mean machine online again  # ---------------- New known client connecting, could mean machine online again
           if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip 
     foreach my $id (keys(%hostip)) {   && $clientip ne '127.0.0.1') {
  if ($hostip{$id} ne $clientip ||   &Apache::lonnet::reconlonc($clientname);
     $hostip{$currenthostid} eq $clientip) {  
     # no need to try to do recon's to myself  
     next;  
  }  
  &reconlonc("$perlvar{'lonSockDir'}/$id");  
     }      }
     &logthis("<font color=green>Established connection: $clientname</font>");      &logthis("<font color='green'>Established connection: $clientname</font>");
     &status('Will listen to '.$clientname);      &status('Will listen to '.$clientname);
   
     ResetStatistics();  
   
 # ------------------------------------------------------------ Process requests  # ------------------------------------------------------------ Process requests
     my $KeepGoing = 1;      my $keep_going = 1;
     while ((my $userinput=GetRequest) && $KeepGoing) {      my $user_input;
  $KeepGoing = ProcessRequest($userinput);      while(($user_input = get_request) && $keep_going) {
 # -------------------------------------------------------------------- complete   alarm(120);
    Debug("Main: Got $user_input\n");
  &status('Listening to '.$clientname);   $keep_going = &process_request($user_input);
    alarm(0);
    &status('Listening to '.$clientname." ($keymode)");   
     }      }
   
 # --------------------------------------------- client unknown or fishy, refuse  # --------------------------------------------- client unknown or fishy, refuse
  } else {   }  else {
     print $client "refused\n";      print $client "refused\n";
     $client->close();      $client->close();
     &logthis("<font color=blue>WARNING: "      &logthis("<font color='blue'>WARNING: "
      ."Rejected client $clientip, closing connection</font>");       ."Rejected client $clientip, closing connection</font>");
  }   }
     }                   }            
           
 # =============================================================================  # =============================================================================
           
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color='red'>CRITICAL: "
      ."Disconnect from $clientip ($clientname)</font>");           ."Disconnect from $clientip ($clientname)</font>");    
           
           
Line 3915  sub make_new_child { Line 6132  sub make_new_child {
     exit;      exit;
           
 }  }
   #
   #   Determine if a user is an author for the indicated domain.
   #
   # Parameters:
   #    domain          - domain to check in .
   #    user            - Name of user to check.
   #
   # Return:
   #     1             - User is an author for domain.
   #     0             - User is not an author for domain.
   sub is_author {
       my ($domain, $user) = @_;
   
       &Debug("is_author: $user @ $domain");
   
       my $hashref = &tie_user_hash($domain, $user, "roles",
    &GDBM_READER());
   
       #  Author role should show up as a key /domain/_au
   
       my $key    = "/$domain/_au";
       my $value;
       if (defined($hashref)) {
    $value = $hashref->{$key};
       }
   
       if(defined($value)) {
    &Debug("$user @ $domain is an author");
       }
   
       return defined($value);
   }
 #  #
 #   Checks to see if the input roleput request was to set  #   Checks to see if the input roleput request was to set
 # an author role.  If so, invokes the lchtmldir script to set  # an author role.  If so, invokes the lchtmldir script to set
Line 3928  sub make_new_child { Line 6175  sub make_new_child {
 #    user      - Name of the user for which the role is being put.  #    user      - Name of the user for which the role is being put.
 #    authtype  - The authentication type associated with the user.  #    authtype  - The authentication type associated with the user.
 #  #
 sub ManagePermissions  sub manage_permissions {
 {      my ($request, $domain, $user, $authtype) = @_;
     my $request = shift;  
     my $domain  = shift;      &Debug("manage_permissions: $request $domain $user $authtype");
     my $user    = shift;  
     my $authtype= shift;  
   
     # See if the request is of the form /$domain/_au      # See if the request is of the form /$domain/_au
     &logthis("ruequest is $request");      if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...  
  my $execdir = $perlvar{'lonDaemons'};   my $execdir = $perlvar{'lonDaemons'};
  my $userhome= "/home/$user" ;   my $userhome= "/home/$user" ;
  &logthis("system $execdir/lchtmldir $userhome $user $authtype");   &logthis("system $execdir/lchtmldir $userhome $user $authtype");
    &Debug("Setting homedir permissions for $userhome");
  system("$execdir/lchtmldir $userhome $user $authtype");   system("$execdir/lchtmldir $userhome $user $authtype");
     }      }
 }  }
   
   
   #
   #  Return the full path of a user password file, whether it exists or not.
   # Parameters:
   #   domain     - Domain in which the password file lives.
   #   user       - name of the user.
   # Returns:
   #    Full passwd path:
   #
   sub password_path {
       my ($domain, $user) = @_;
       return &propath($domain, $user).'/passwd';
   }
   
   #   Password Filename
   #   Returns the path to a passwd file given domain and user... only if
   #  it exists.
   # Parameters:
   #   domain    - Domain in which to search.
   #   user      - username.
   # Returns:
   #   - If the password file exists returns its path.
   #   - If the password file does not exist, returns undefined.
   #
   sub password_filename {
       my ($domain, $user) = @_;
   
       Debug ("PasswordFilename called: dom = $domain user = $user");
   
       my $path  = &password_path($domain, $user);
       Debug("PasswordFilename got path: $path");
       if(-e $path) {
    return $path;
       } else {
    return undef;
       }
   }
   
   #
   #   Rewrite the contents of the user's passwd file.
   #  Parameters:
   #    domain    - domain of the user.
   #    name      - User's name.
   #    contents  - New contents of the file.
   # Returns:
   #   0    - Failed.
   #   1    - Success.
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  sub rewrite_password_file {
       my ($domain, $user, $contents) = @_;
   
       my $file = &password_filename($domain, $user);
       if (defined $file) {
    my $pf = IO::File->new(">$file");
    if($pf) {
       print $pf "$contents\n";
       return 1;
    } else {
       return 0;
    }
       } else {
    return 0;
       }
   
   }
   
   #
   #   get_auth_type - Determines the authorization type of a user in a domain.
   
 #     Returns the authorization type or nouser if there is no such user.  #     Returns the authorization type or nouser if there is no such user.
 #  #
 sub GetAuthType   sub get_auth_type 
 {  {
     my $domain = shift;  
     my $user   = shift;  
   
     Debug("GetAuthType( $domain, $user ) \n");      my ($domain, $user)  = @_;
   
       Debug("get_auth_type( $domain, $user ) \n");
     my $proname    = &propath($domain, $user);       my $proname    = &propath($domain, $user); 
     my $passwdfile = "$proname/passwd";      my $passwdfile = "$proname/passwd";
     if( -e $passwdfile ) {      if( -e $passwdfile ) {
Line 3964  sub GetAuthType Line 6276  sub GetAuthType
  Debug("Password info = $realpassword\n");   Debug("Password info = $realpassword\n");
  my ($authtype, $contentpwd) = split(/:/, $realpassword);   my ($authtype, $contentpwd) = split(/:/, $realpassword);
  Debug("Authtype = $authtype, content = $contentpwd\n");   Debug("Authtype = $authtype, content = $contentpwd\n");
  my $availinfo = '';   return "$authtype:$contentpwd";     
  if($authtype eq 'krb4' or $authtype eq 'krb5') {      } else {
     $availinfo = $contentpwd;  
  }  
   
  return "$authtype:$availinfo";  
     }  
     else {  
  Debug("Returning nouser");   Debug("Returning nouser");
  return "nouser";   return "nouser";
     }      }
 }  }
   
   #
   #  Validate a user given their domain, name and password.  This utility
   #  function is used by both  AuthenticateHandler and ChangePasswordHandler
   #  to validate the login credentials of a user.
   # Parameters:
   #    $domain    - The domain being logged into (this is required due to
   #                 the capability for multihomed systems.
   #    $user      - The name of the user being validated.
   #    $password  - The user's propoposed password.
   #
   # Returns:
   #     1        - The domain,user,pasword triplet corresponds to a valid
   #                user.
   #     0        - The domain,user,password triplet is not a valid user.
   #
   sub validate_user {
       my ($domain, $user, $password, $checkdefauth) = @_;
   
       # Why negative ~pi you may well ask?  Well this function is about
       # authentication, and therefore very important to get right.
       # I've initialized the flag that determines whether or not I've 
       # validated correctly to a value it's not supposed to get.
       # At the end of this function. I'll ensure that it's not still that
       # value so we don't just wind up returning some accidental value
       # as a result of executing an unforseen code path that
       # did not set $validated.  At the end of valid execution paths,
       # validated shoule be 1 for success or 0 for failuer.
   
       my $validated = -3.14159;
   
       #  How we authenticate is determined by the type of authentication
       #  the user has been assigned.  If the authentication type is
       #  "nouser", the user does not exist so we will return 0.
   
       my $contents = &get_auth_type($domain, $user);
       my ($howpwd, $contentpwd) = split(/:/, $contents);
   
       my $null = pack("C",0); # Used by kerberos auth types.
   
       if ($howpwd eq 'nouser') {
           if ($checkdefauth) {
               my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
               if ($domdefaults{'auth_def'} eq 'localauth') {
                   $howpwd = $domdefaults{'auth_def'};
                   $contentpwd = $domdefaults{'auth_arg_def'};
               } elsif ((($domdefaults{'auth_def'} eq 'krb4') || 
                         ($domdefaults{'auth_def'} eq 'krb5')) &&
                        ($domdefaults{'auth_arg_def'} ne '')) {
                   $howpwd = $domdefaults{'auth_def'};
                   $contentpwd = $domdefaults{'auth_arg_def'}; 
               }
           }
       } 
       if ($howpwd ne 'nouser') {
    if($howpwd eq "internal") { # Encrypted is in local password file.
       $validated = (crypt($password, $contentpwd) eq $contentpwd);
    }
    elsif ($howpwd eq "unix") { # User is a normal unix user.
       $contentpwd = (getpwnam($user))[1];
       if($contentpwd) {
    if($contentpwd eq 'x') { # Shadow password file...
       my $pwauth_path = "/usr/local/sbin/pwauth";
       open PWAUTH,  "|$pwauth_path" or
    die "Cannot invoke authentication";
       print PWAUTH "$user\n$password\n";
       close PWAUTH;
       $validated = ! $?;
   
    } else {         # Passwords in /etc/passwd. 
       $validated = (crypt($password,
    $contentpwd) eq $contentpwd);
    }
       } else {
    $validated = 0;
       }
    }
    elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
       if(! ($password =~ /$null/) ) {
    my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
      "",
      $contentpwd,,
      'krbtgt',
      $contentpwd,
      1,
      $password);
    if(!$k4error) {
       $validated = 1;
    } else {
       $validated = 0;
       &logthis('krb4: '.$user.', '.$contentpwd.', '.
        &Authen::Krb4::get_err_txt($Authen::Krb4::error));
    }
       } else {
    $validated = 0; # Password has a match with null.
       }
    } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
       if(!($password =~ /$null/)) { # Null password not allowed.
    my $krbclient = &Authen::Krb5::parse_name($user.'@'
     .$contentpwd);
    my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
    my $krbserver  = &Authen::Krb5::parse_name($krbservice);
    my $credentials= &Authen::Krb5::cc_default();
    $credentials->initialize(&Authen::Krb5::parse_name($user.'@'
                                                                    .$contentpwd));
                   my $krbreturn;
                   if (exists(&Authen::Krb5::get_init_creds_password)) {
                       $krbreturn = 
                           &Authen::Krb5::get_init_creds_password($krbclient,$password,
                                                                  $krbservice);
                       $validated = (ref($krbreturn) eq 'Authen::Krb5::Creds');
                   } else {
       $krbreturn  = 
                           &Authen::Krb5::get_in_tkt_with_password($krbclient,$krbserver,
    $password,$credentials);
       $validated = ($krbreturn == 1);
                   }
    if (!$validated) {
       &logthis('krb5: '.$user.', '.$contentpwd.', '.
        &Authen::Krb5::error());
    }
       } else {
    $validated = 0;
       }
    } elsif ($howpwd eq "localauth") { 
       #  Authenticate via installation specific authentcation method:
       $validated = &localauth::localauth($user, 
          $password, 
          $contentpwd,
          $domain);
       if ($validated < 0) {
    &logthis("localauth for $contentpwd $user:$domain returned a $validated");
    $validated = 0;
       }
    } else { # Unrecognized auth is also bad.
       $validated = 0;
    }
       } else {
    $validated = 0;
       }
       #
       #  $validated has the correct stat of the authentication:
       #
   
       unless ($validated != -3.14159) {
    #  I >really really< want to know if this happens.
    #  since it indicates that user authentication is badly
    #  broken in some code path.
           #
    die "ValidateUser - failed to set the value of validated $domain, $user $password";
       }
       return $validated;
   }
   
   
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
     my $found=0;      my $found=0;
     my $expr='^'.$hostid.':'.$ip.':';      my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
     $expr =~ s/\./\\\./g;  
     my $sh;      my $sh;
     if ($sh=IO::File->new("$fname.subscription")) {      if ($sh=IO::File->new("$fname.subscription")) {
  while (my $subline=<$sh>) {   while (my $subline=<$sh>) {
Line 3997  sub addline { Line 6456  sub addline {
     return $found;      return $found;
 }  }
   
 sub getchat {  sub get_chat {
     my ($cdom,$cname,$udom,$uname)=@_;      my ($cdom,$cname,$udom,$uname,$group)=@_;
     my %hash;  
     my $proname=&propath($cdom,$cname);  
     my @entries=();      my @entries=();
     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",      my $namespace = 'nohist_chatroom';
     &GDBM_READER(),0640)) {      my $namespace_inroom = 'nohist_inchatroom';
  @entries=map { $_.':'.$hash{$_} } sort keys %hash;      if ($group ne '') {
  untie %hash;          $namespace .= '_'.$group;
           $namespace_inroom .= '_'.$group;
       }
       my $hashref = &tie_user_hash($cdom, $cname, $namespace,
    &GDBM_READER());
       if ($hashref) {
    @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
    &untie_user_hash($hashref);
     }      }
     my @participants=();      my @participants=();
     my $cutoff=time-60;      my $cutoff=time-60;
     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",      $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
     &GDBM_WRCREAT(),0640)) {        &GDBM_WRCREAT());
         $hash{$uname.':'.$udom}=time;      if ($hashref) {
         foreach (sort keys %hash) {          $hashref->{$uname.':'.$udom}=time;
     if ($hash{$_}>$cutoff) {          foreach my $user (sort(keys(%$hashref))) {
  $participants[$#participants+1]='active_participant:'.$_;      if ($hashref->{$user}>$cutoff) {
    push(@participants, 'active_participant:'.$user);
             }              }
         }          }
         untie %hash;          &untie_user_hash($hashref);
     }      }
     return (@participants,@entries);      return (@participants,@entries);
 }  }
   
 sub chatadd {  sub chat_add {
     my ($cdom,$cname,$newchat)=@_;      my ($cdom,$cname,$newchat,$group)=@_;
     my %hash;  
     my $proname=&propath($cdom,$cname);  
     my @entries=();      my @entries=();
     my $time=time;      my $time=time;
     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",      my $namespace = 'nohist_chatroom';
     &GDBM_WRCREAT(),0640)) {      my $logfile = 'chatroom.log';
  @entries=map { $_.':'.$hash{$_} } sort keys %hash;      if ($group ne '') {
           $namespace .= '_'.$group;
           $logfile = 'chatroom_'.$group.'.log';
       }
       my $hashref = &tie_user_hash($cdom, $cname, $namespace,
    &GDBM_WRCREAT());
       if ($hashref) {
    @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
  my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);   my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
  my ($thentime,$idnum)=split(/\_/,$lastid);   my ($thentime,$idnum)=split(/\_/,$lastid);
  my $newid=$time.'_000000';   my $newid=$time.'_000000';
Line 4040  sub chatadd { Line 6511  sub chatadd {
     $idnum=substr('000000'.$idnum,-6,6);      $idnum=substr('000000'.$idnum,-6,6);
     $newid=$time.'_'.$idnum;      $newid=$time.'_'.$idnum;
  }   }
  $hash{$newid}=$newchat;   $hashref->{$newid}=$newchat;
  my $expired=$time-3600;   my $expired=$time-3600;
  foreach (keys %hash) {   foreach my $comment (keys(%$hashref)) {
     my ($thistime)=($_=~/(\d+)\_/);      my ($thistime) = ($comment=~/(\d+)\_/);
     if ($thistime<$expired) {      if ($thistime<$expired) {
  delete $hash{$_};   delete $hashref->{$comment};
     }      }
  }   }
  untie %hash;   {
     }      my $proname=&propath($cdom,$cname);
     {      if (open(CHATLOG,">>$proname/$logfile")) { 
  my $hfh;   print CHATLOG ("$time:".&unescape($newchat)."\n");
  if ($hfh=IO::File->new(">>$proname/chatroom.log")) {       }
     print $hfh "$time:".&unescape($newchat)."\n";      close(CHATLOG);
  }   }
    &untie_user_hash($hashref);
     }      }
 }  }
   
 sub unsub {  sub unsub {
     my ($fname,$clientip)=@_;      my ($fname,$clientip)=@_;
     my $result;      my $result;
       my $unsubs = 0; # Number of successful unsubscribes:
   
   
       # An old way subscriptions were handled was to have a 
       # subscription marker file:
   
       Debug("Attempting unlink of $fname.$clientname");
     if (unlink("$fname.$clientname")) {      if (unlink("$fname.$clientname")) {
  $result="ok\n";   $unsubs++; # Successful unsub via marker file.
     } else {      } 
  $result="not_subscribed\n";  
     }      # The more modern way to do it is to have a subscription list
       # file:
   
     if (-e "$fname.subscription") {      if (-e "$fname.subscription") {
  my $found=&addline($fname,$clientname,$clientip,'');   my $found=&addline($fname,$clientname,$clientip,'');
  if ($found) { $result="ok\n"; }   if ($found) { 
       $unsubs++;
    }
       } 
   
       #  If either or both of these mechanisms succeeded in unsubscribing a 
       #  resource we can return ok:
   
       if($unsubs) {
    $result = "ok\n";
     } else {      } else {
  if ($result != "ok\n") { $result="not_subscribed\n"; }   $result = "not_subscribed\n";
     }      }
   
     return $result;      return $result;
 }  }
   
Line 4124  sub thisversion { Line 6615  sub thisversion {
 sub subscribe {  sub subscribe {
     my ($userinput,$clientip)=@_;      my ($userinput,$clientip)=@_;
     my $result;      my $result;
     my ($cmd,$fname)=split(/:/,$userinput);      my ($cmd,$fname)=split(/:/,$userinput,2);
     my $ownership=&ishome($fname);      my $ownership=&ishome($fname);
     if ($ownership eq 'owner') {      if ($ownership eq 'owner') {
 # explitly asking for the current version?  # explitly asking for the current version?
Line 4157  sub subscribe { Line 6648  sub subscribe {
                 # the metadata                  # the metadata
  unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }   unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
  $fname=~s/\/home\/httpd\/html\/res/raw/;   $fname=~s/\/home\/httpd\/html\/res/raw/;
  $fname="http://$thisserver/".$fname;   $fname="http://".&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
  $result="$fname\n";   $result="$fname\n";
     }      }
  } else {   } else {
Line 4168  sub subscribe { Line 6659  sub subscribe {
     }      }
     return $result;      return $result;
 }  }
   #  Change the passwd of a unix user.  The caller must have
   #  first verified that the user is a loncapa user.
   #
   # Parameters:
   #    user      - Unix user name to change.
   #    pass      - New password for the user.
   # Returns:
   #    ok    - if success
   #    other - Some meaningfule error message string.
   # NOTE:
   #    invokes a setuid script to change the passwd.
   sub change_unix_password {
       my ($user, $pass) = @_;
   
       &Debug("change_unix_password");
       my $execdir=$perlvar{'lonDaemons'};
       &Debug("Opening lcpasswd pipeline");
       my $pf = IO::File->new("|$execdir/lcpasswd > "
      ."$perlvar{'lonDaemons'}"
      ."/logs/lcpasswd.log");
       print $pf "$user\n$pass\n$pass\n";
       close $pf;
       my $err = $?;
       return ($err < @passwderrors) ? $passwderrors[$err] : 
    "pwchange_falure - unknown error";
   
       
   }
   
   
 sub make_passwd_file {  sub make_passwd_file {
     my ($uname, $umode,$npass,$passfilename)=@_;      my ($uname, $umode,$npass,$passfilename)=@_;
     my $result="ok\n";      my $result="ok";
     if ($umode eq 'krb4' or $umode eq 'krb5') {      if ($umode eq 'krb4' or $umode eq 'krb5') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new(">$passfilename");
     print $pf "$umode:$npass\n";      if ($pf) {
    print $pf "$umode:$npass\n";
       } else {
    $result = "pass_file_failed_error";
       }
  }   }
     } elsif ($umode eq 'internal') {      } elsif ($umode eq 'internal') {
  my $salt=time;   my $salt=time;
Line 4184  sub make_passwd_file { Line 6708  sub make_passwd_file {
  {   {
     &Debug("Creating internal auth");      &Debug("Creating internal auth");
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new(">$passfilename");
     print $pf "internal:$ncpass\n";       if($pf) {
    print $pf "internal:$ncpass\n"; 
       } else {
    $result = "pass_file_failed_error";
       }
  }   }
     } elsif ($umode eq 'localauth') {      } elsif ($umode eq 'localauth') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new(">$passfilename");
     print $pf "localauth:$npass\n";      if($pf) {
    print $pf "localauth:$npass\n";
       } else {
    $result = "pass_file_failed_error";
       }
  }   }
     } elsif ($umode eq 'unix') {      } elsif ($umode eq 'unix') {
  {   {
     my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";      #
       #  Don't allow the creation of privileged accounts!!! that would
       #  be real bad!!!
       #
       my $uid = getpwnam($uname);
       if((defined $uid) && ($uid == 0)) {
    &logthis(">>>Attempted to create privilged account blocked");
    return "no_priv_account_error\n";
       }
   
       my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
   
       my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
     {      {
  &Debug("Executing external: ".$execpath);   &Debug("Executing external: ".$execpath);
  &Debug("user  = ".$uname.", Password =". $npass);   &Debug("user  = ".$uname.", Password =". $npass);
Line 4201  sub make_passwd_file { Line 6745  sub make_passwd_file {
  print $se "$uname\n";   print $se "$uname\n";
  print $se "$npass\n";   print $se "$npass\n";
  print $se "$npass\n";   print $se "$npass\n";
    print $se "$lc_error_file\n"; # Status -> unique file.
     }      }
     my $useraddok = $?;      if (-r $lc_error_file) {
     if($useraddok > 0) {   &Debug("Opening error file: $lc_error_file");
  &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));   my $error = IO::File->new("< $lc_error_file");
    my $useraddok = <$error>;
    $error->close;
    unlink($lc_error_file);
   
    chomp $useraddok;
   
    if($useraddok > 0) {
       my $error_text = &lcuseraddstrerror($useraddok);
       &logthis("Failed lcuseradd: $error_text");
       $result = "lcuseradd_failed:$error_text";
    }  else {
       my $pf = IO::File->new(">$passfilename");
       if($pf) {
    print $pf "unix:\n";
       } else {
    $result = "pass_file_failed_error";
       }
    }
       }  else {
    &Debug("Could not locate lcuseradd error: $lc_error_file");
    $result="bug_lcuseradd_no_output_file";
     }      }
     my $pf = IO::File->new(">$passfilename");  
     print $pf "unix:\n";  
  }   }
     } elsif ($umode eq 'none') {      } elsif ($umode eq 'none') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new("> $passfilename");
     print $pf "none:\n";      if($pf) {
    print $pf "none:\n";
       } else {
    $result = "pass_file_failed_error";
       }
  }   }
     } else {      } else {
  $result="auth_mode_error\n";   $result="auth_mode_error";
     }      }
     return $result;      return $result;
 }  }
   
   sub convert_photo {
       my ($start,$dest)=@_;
       system("convert $start $dest");
   }
   
 sub sethost {  sub sethost {
     my ($remotereq) = @_;      my ($remotereq) = @_;
     my (undef,$hostid)=split(/:/,$remotereq);      my (undef,$hostid)=split(/:/,$remotereq);
       # ignore sethost if we are already correct
       if ($hostid eq $currenthostid) {
    return 'ok';
       }
   
     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {      if (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'}) 
  $currenthostid=$hostid;   eq &Apache::lonnet::get_host_ip($hostid)) {
  $currentdomainid=$hostdom{$hostid};   $currenthostid  =$hostid;
    $currentdomainid=&Apache::lonnet::host_domain($hostid);
  &logthis("Setting hostid to $hostid, and domain to $currentdomainid");   &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {      } else {
  &logthis("Requested host id $hostid not an alias of ".   &logthis("Requested host id $hostid not an alias of ".
Line 4241  sub version { Line 6820  sub version {
     $remoteVERSION=(split(/:/,$userinput))[1];      $remoteVERSION=(split(/:/,$userinput))[1];
     return "version:$VERSION";      return "version:$VERSION";
 }  }
 ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<  
 #There is a copy of this in lonnet.pm  
 #   Can we hoist these lil' things out into common places?  
 #  
 sub userload {  
     my $numusers=0;  
     {  
  opendir(LONIDS,$perlvar{'lonIDsDir'});  
  my $filename;  
  my $curtime=time;  
  while ($filename=readdir(LONIDS)) {  
     if ($filename eq '.' || $filename eq '..') {next;}  
     my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];  
     if ($curtime-$mtime < 1800) { $numusers++; }  
  }  
  closedir(LONIDS);  
     }  
     my $userloadpercent=0;  
     my $maxuserload=$perlvar{'lonUserLoadLim'};  
     if ($maxuserload) {  
  $userloadpercent=100*$numusers/$maxuserload;  
     }  
     $userloadpercent=sprintf("%.2f",$userloadpercent);  
     return $userloadpercent;  
 }  
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  # ----------------------------------- POD (plain old documentation, CPAN style)
   
Line 4474  Place in B<logs/lond.log> Line 7029  Place in B<logs/lond.log>
   
 stores hash in namespace  stores hash in namespace
   
 =item rolesput  =item rolesputy
   
 put a role into a user's environment  put a role into a user's environment
   
Line 4582  to the client, and the connection is clo Line 7137  to the client, and the connection is clo
 IO::Socket  IO::Socket
 IO::File  IO::File
 Apache::File  Apache::File
 Symbol  
 POSIX  POSIX
 Crypt::IDEA  Crypt::IDEA
 LWP::UserAgent()  LWP::UserAgent()
Line 4601  linux Line 7155  linux
 Server/Process  Server/Process
   
 =cut  =cut
   
   
   =pod
   
   =head1 LOG MESSAGES
   
   The messages below can be emitted in the lond log.  This log is located
   in ~httpd/perl/logs/lond.log  Many log messages have HTML encapsulation
   to provide coloring if examined from inside a web page. Some do not.
   Where color is used, the colors are; Red for sometihhng to get excited
   about and to follow up on. Yellow for something to keep an eye on to
   be sure it does not get worse, Green,and Blue for informational items.
   
   In the discussions below, sometimes reference is made to ~httpd
   when describing file locations.  There isn't really an httpd 
   user, however there is an httpd directory that gets installed in the
   place that user home directories go.  On linux, this is usually
   (always?) /home/httpd.
   
   
   Some messages are colorless.  These are usually (not always)
   Green/Blue color level messages.
   
   =over 2
   
   =item (Red)  LocalConnection rejecting non local: <ip> ne 127.0.0.1
   
   A local connection negotiation was attempted by
   a host whose IP address was not 127.0.0.1.
   The socket is closed and the child will exit.
   lond has three ways to establish an encyrption
   key with a client:
   
   =over 2
   
   =item local 
   
   The key is written and read from a file.
   This is only valid for connections from localhost.
   
   =item insecure 
   
   The key is generated by the server and
   transmitted to the client.
   
   =item  ssl (secure)
   
   An ssl connection is negotiated with the client,
   the key is generated by the server and sent to the 
   client across this ssl connection before the
   ssl connectionis terminated and clear text
   transmission resumes.
   
   =back
   
   =item (Red) LocalConnection: caller is insane! init = <init> and type = <type>
   
   The client is local but has not sent an initialization
   string that is the literal "init:local"  The connection
   is closed and the child exits.
   
   =item Red CRITICAL Can't get key file <error>        
   
   SSL key negotiation is being attempted but the call to
   lonssl::KeyFile  failed.  This usually means that the
   configuration file is not correctly defining or protecting
   the directories/files lonCertificateDirectory or
   lonnetPrivateKey
   <error> is a string that describes the reason that
   the key file could not be located.
   
   =item (Red) CRITICAL  Can't get certificates <error>  
   
   SSL key negotiation failed because we were not able to retrives our certificate
   or the CA's certificate in the call to lonssl::CertificateFile
   <error> is the textual reason this failed.  Usual reasons:
   
   =over 2
          
   =item Apache config file for loncapa  incorrect:
    
   one of the variables 
   lonCertificateDirectory, lonnetCertificateAuthority, or lonnetCertificate
   undefined or incorrect
   
   =item Permission error:
   
   The directory pointed to by lonCertificateDirectory is not readable by lond
   
   =item Permission error:
   
   Files in the directory pointed to by lonCertificateDirectory are not readable by lond.
   
   =item Installation error:                         
   
   Either the certificate authority file or the certificate have not
   been installed in lonCertificateDirectory.
   
   =item (Red) CRITICAL SSL Socket promotion failed:  <err> 
   
   The promotion of the connection from plaintext to SSL failed
   <err> is the reason for the failure.  There are two
   system calls involved in the promotion (one of which failed), 
   a dup to produce
   a second fd on the raw socket over which the encrypted data
   will flow and IO::SOcket::SSL->new_from_fd which creates
   the SSL connection on the duped fd.
   
   =item (Blue)   WARNING client did not respond to challenge 
   
   This occurs on an insecure (non SSL) connection negotiation request.
   lond generates some number from the time, the PID and sends it to
   the client.  The client must respond by echoing this information back.
   If the client does not do so, that's a violation of the challenge
   protocols and the connection will be failed.
   
   =item (Red) No manager table. Nobody can manage!!    
   
   lond has the concept of privileged hosts that
   can perform remote management function such
   as update the hosts.tab.   The manager hosts
   are described in the 
   ~httpd/lonTabs/managers.tab file.
   this message is logged if this file is missing.
   
   
   =item (Green) Registering manager <dnsname> as <cluster_name> with <ipaddress>
   
   Reports the successful parse and registration
   of a specific manager. 
   
   =item Green existing host <clustername:dnsname>  
   
   The manager host is already defined in the hosts.tab
   the information in that table, rather than the info in the
   manager table will be used to determine the manager's ip.
   
   =item (Red) Unable to craete <filename>                 
   
   lond has been asked to create new versions of an administrative
   file (by a manager).  When this is done, the new file is created
   in a temp file and then renamed into place so that there are always
   usable administrative files, even if the update fails.  This failure
   message means that the temp file could not be created.
   The update is abandoned, and the old file is available for use.
   
   =item (Green) CopyFile from <oldname> to <newname> failed
   
   In an update of administrative files, the copy of the existing file to a
   backup file failed.  The installation of the new file may still succeed,
   but there will not be a back up file to rever to (this should probably
   be yellow).
   
   =item (Green) Pushfile: backed up <oldname> to <newname>
   
   See above, the backup of the old administrative file succeeded.
   
   =item (Red)  Pushfile: Unable to install <filename> <reason>
   
   The new administrative file could not be installed.  In this case,
   the old administrative file is still in use.
   
   =item (Green) Installed new < filename>.                      
   
   The new administrative file was successfullly installed.                                               
   
   =item (Red) Reinitializing lond pid=<pid>                    
   
   The lonc child process <pid> will be sent a USR2 
   signal.
   
   =item (Red) Reinitializing self                                    
   
   We've been asked to re-read our administrative files,and
   are doing so.
   
   =item (Yellow) error:Invalid process identifier <ident>  
   
   A reinit command was received, but the target part of the 
   command was not valid.  It must be either
   'lond' or 'lonc' but was <ident>
   
   =item (Green) isValideditCommand checking: Command = <command> Key = <key> newline = <newline>
   
   Checking to see if lond has been handed a valid edit
   command.  It is possible the edit command is not valid
   in that case there are no log messages to indicate that.
   
   =item Result of password change for  <username> pwchange_success
   
   The password for <username> was
   successfully changed.
   
   =item Unable to open <user> passwd to change password
   
   Could not rewrite the 
   internal password file for a user
   
   =item Result of password change for <user> : <result>
                                                                        
   A unix password change for <user> was attempted 
   and the pipe returned <result>  
   
   =item LWP GET: <message> for <fname> (<remoteurl>)
   
   The lightweight process fetch for a resource failed
   with <message> the local filename that should
   have existed/been created was  <fname> the
   corresponding URI: <remoteurl>  This is emitted in several
   places.
   
   =item Unable to move <transname> to <destname>     
   
   From fetch_user_file_handler - the user file was replicated but could not
   be mv'd to its final location.
   
   =item Looking for <domain> <username>              
   
   From user_has_session_handler - This should be a Debug call instead
   it indicates lond is about to check whether the specified user has a 
   session active on the specified domain on the local host.
   
   =item Client <ip> (<name>) hanging up: <input>     
   
   lond has been asked to exit by its client.  The <ip> and <name> identify the
   client systemand <input> is the full exit command sent to the server.
   
   =item Red CRITICAL: ABNORMAL EXIT. child <pid> for server <hostname> died through a crass with this error->[<message>].
                                                    
   A lond child terminated.  NOte that this termination can also occur when the
   child receives the QUIT or DIE signals.  <pid> is the process id of the child,
   <hostname> the host lond is working for, and <message> the reason the child died
   to the best of our ability to get it (I would guess that any numeric value
   represents and errno value).  This is immediately followed by
   
   =item  Famous last words: Catching exception - <log> 
   
   Where log is some recent information about the state of the child.
   
   =item Red CRITICAL: TIME OUT <pid>                     
   
   Some timeout occured for server <pid>.  THis is normally a timeout on an LWP
   doing an HTTP::GET.
   
   =item child <pid> died                              
   
   The reaper caught a SIGCHILD for the lond child process <pid>
   This should be modified to also display the IP of the dying child
   $children{$pid}
   
   =item Unknown child 0 died                           
   A child died but the wait for it returned a pid of zero which really should not
   ever happen. 
   
   =item Child <which> - <pid> looks like we missed it's death 
   
   When a sigchild is received, the reaper process checks all children to see if they are
   alive.  If children are dying quite quickly, the lack of signal queuing can mean
   that a signal hearalds the death of more than one child.  If so this message indicates
   which other one died. <which> is the ip of a dead child
   
   =item Free socket: <shutdownretval>                
   
   The HUNTSMAN sub was called due to a SIGINT in a child process.  The socket is being shutdown.
   for whatever reason, <shutdownretval> is printed but in fact shutdown() is not documented
   to return anything. This is followed by: 
   
   =item Red CRITICAL: Shutting down                       
   
   Just prior to exit.
   
   =item Free socket: <shutdownretval>                 
   
   The HUPSMAN sub was called due to a SIGHUP.  all children get killsed, and lond execs itself.
   This is followed by:
   
   =item (Red) CRITICAL: Restarting                         
   
   lond is about to exec itself to restart.
   
   =item (Blue) Updating connections                        
   
   (In response to a USR2).  All the children (except the one for localhost)
   are about to be killed, the hosts tab reread, and Apache reloaded via apachereload.
   
   =item (Blue) UpdateHosts killing child <pid> for ip <ip>   
   
   Due to USR2 as above.
   
   =item (Green) keeping child for ip <ip> (pid = <pid>)    
   
   In response to USR2 as above, the child indicated is not being restarted because
   it's assumed that we'll always need a child for the localhost.
   
   
   =item Going to check on the children                
   
   Parent is about to check on the health of the child processes.
   Note that this is in response to a USR1 sent to the parent lond.
   there may be one or more of the next two messages:
   
   =item <pid> is dead                                 
   
   A child that we have in our child hash as alive has evidently died.
   
   =item  Child <pid> did not respond                   
   
   In the health check the child <pid> did not update/produce a pid_.txt
   file when sent it's USR1 signal.  That process is killed with a 9 signal, as it's
   assumed to be hung in some un-fixable way.
   
   =item Finished checking children                   
    
   Master processs's USR1 processing is cojmplete.
   
   =item (Red) CRITICAL: ------- Starting ------            
   
   (There are more '-'s on either side).  Lond has forked itself off to 
   form a new session and is about to start actual initialization.
   
   =item (Green) Attempting to start child (<client>)       
   
   Started a new child process for <client>.  Client is IO::Socket object
   connected to the child.  This was as a result of a TCP/IP connection from a client.
   
   =item Unable to determine who caller was, getpeername returned nothing
                                                     
   In child process initialization.  either getpeername returned undef or
   a zero sized object was returned.  Processing continues, but in my opinion,
   this should be cause for the child to exit.
   
   =item Unable to determine clientip                  
   
   In child process initialization.  The peer address from getpeername was not defined.
   The client address is stored as "Unavailable" and processing continues.
   
   =item (Yellow) INFO: Connection <ip> <name> connection type = <type>
                                                     
   In child initialization.  A good connectionw as received from <ip>.
   
   =over 2
   
   =item <name> 
   
   is the name of the client from hosts.tab.
   
   =item <type> 
   
   Is the connection type which is either 
   
   =over 2
   
   =item manager 
   
   The connection is from a manager node, not in hosts.tab
   
   =item client  
   
   the connection is from a non-manager in the hosts.tab
   
   =item both
   
   The connection is from a manager in the hosts.tab.
   
   =back
   
   =back
   
   =item (Blue) Certificates not installed -- trying insecure auth
   
   One of the certificate file, key file or
   certificate authority file could not be found for a client attempting
   SSL connection intiation.  COnnection will be attemptied in in-secure mode.
   (this would be a system with an up to date lond that has not gotten a 
   certificate from us).
   
   =item (Green)  Successful local authentication            
   
   A local connection successfully negotiated the encryption key. 
   In this case the IDEA key is in a file (that is hopefully well protected).
   
   =item (Green) Successful ssl authentication with <client>  
   
   The client (<client> is the peer's name in hosts.tab), has successfully
   negotiated an SSL connection with this child process.
   
   =item (Green) Successful insecure authentication with <client>
                                                      
   
   The client has successfully negotiated an  insecure connection withthe child process.
   
   =item (Yellow) Attempted insecure connection disallowed    
   
   The client attempted and failed to successfully negotiate a successful insecure
   connection.  This can happen either because the variable londAllowInsecure is false
   or undefined, or becuse the child did not successfully echo back the challenge
   string.
   
   
   =back
   
   
   =cut
Removed from v.1.177  
changed lines
  Added in v.1.411

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