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Diff for /loncom/lond between versions 1.178.2.2 and 1.344

version 1.178.2.2, 2004/02/23 10:25:52 version 1.344, 2006/10/13 04:23:02
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();
Line 45  use Authen::Krb4; Line 45  use Authen::Krb4;
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use localauth;  use localauth;
   use localenroll;
   use localstudentphoto;
 use File::Copy;  use File::Copy;
   use File::Find;
 use LONCAPA::ConfigFileEdit;  use LONCAPA::ConfigFileEdit;
   use LONCAPA::lonlocal;
   use LONCAPA::lonssl;
   use Fcntl qw(:flock);
   
 my $DEBUG = 1;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
 my $status='';  my $status='';
 my $lastlog='';  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 $thisserver; # DNS of us.
   
   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 85  my $thisserver;
   
 my $ConnectionType;  my $ConnectionType;
   
 my %hostid;  my %hostid; # ID's for hosts in cluster by ip.
 my %hostdom;  my %hostdom; # LonCAPA domain for hosts in cluster.
 my %hostip;  my %hostname; # DNSname -> ID's mapping.
   my %hostip; # IPs for hosts in cluster.
   my %hostdns; # ID's of hosts looked up by DNS name.
   
 my %managers; # Ip -> manager names  my %managers; # Ip -> manager names
   
Line 98  my $CLIENT_OK  = 1; Line 108  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 135  my @adderrors    = ("ok", Line 148  my @adderrors    = ("ok",
     "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 164  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.
   #
   # Implicit inputs:
   #    $thisserver - Our DNS name.
   #
   # Returns:
   #     IDEA session key on success.
   #     undef on failure.
   #
   sub LocalConnection {
       my ($Socket, $initcmd) = @_;
       Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
       if($clientip ne "127.0.0.1") {
    &logthis('<font color="red"> LocalConnection rejecting non local: '
    ."$clientip ne $thisserver </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 400  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 $hostip{$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
         }
      }
 }  }
   
   #
   #  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
   #                 (one of host or domain at this point) into a 
   #                 configuration file pathname.
   #
   #  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, $encidx, 16)));      } else {
       }   return undef;
       return substr($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.  #      $cmd    - the actual keyword that invoked us.
Line 282  sub RegisterHandler { Line 1002  sub RegisterHandler {
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   sub ping_handler {
 sub PingHandler {      my ($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\n","$cmd:$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.  #      $tail   - the tail of the request that invoked us.
Line 307  RegisterHandler("ping", \&PingHandler, 0 Line 1029  RegisterHandler("ping", \&PingHandler, 0
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   sub pong_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
 sub PongHandler {      my $reply=&reply("ping",$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 1062  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\n", "$cmd:$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 1099  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\n", "$cmd:$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 1139  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();      my $userloadpercent=&userload();
    Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");      &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
       
    return 1;      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 1162  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\n", $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 1206  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) = @_;
   
 sub PushFileHandler {      my $userinput = "$cmd:$tail";
    my $cmd    = shift;  
    my $tail   = shift;  
    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);      # At this time we only know that the IP of our partner is a valid manager
    if(ValidManager($cert)) {       # the code below is a hook to do further authentication (e.g. to resolve
       # spoofing).
   
       # Now presumably we have the bona fides of both the peer host and the      my $cert = &GetCertificate($userinput);
       # process making the request.      if(&ValidManager($cert)) { 
   
    # Now presumably we have the bona fides of both the peer host and the
    # process making the request.
               
       my $reply = PushFile($userinput);   my $reply = &PushFile($userinput);
       Reply($client, "$reply\n", $userinput);   &Reply($client, "$reply\n", $userinput);
   
       } else {
    &Failure( $client, "refused\n", $userinput);
       } 
       return 1;
   }
   &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
   
   #
   #   du  - list the disk usuage 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;}
       $total_size+=(stat($_))[7];
    };
    chdir($ududir);
    find($code,$ududir);
    $total_size=int($total_size/1024);
    &Reply($client,"$total_size\n","$cmd:$ududir");
       } else {
    &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 
       }
       return 1;
   }
   &register_handler("du", \&du_handler, 0, 1, 0);
   
   #
   # The ls_handler routine should be considered obosolete and is retained
   # for communication with legacy servers.  Please see the ls2_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\n", $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);
   
   #
   # Please also see the ls_handler, which this routine obosolets.
   # 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\n", $userinput); # This supports debug logging.
      return 1;
   }
   &register_handler("ls2", \&ls2_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 1430  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\n", $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 1461  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 1498  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 1512  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);      
    Debug(" Authenticate domain = $udom, user = $uname, password = $upass");      #  udom    - User's domain.
    chomp($upass);      #  uname   - Username.
    $upass=unescape($upass);      #  upass   - User's password.
    my $proname=propath($udom,$uname);      
    my $passfilename="$proname/passwd";      my ($udom,$uname,$upass)=split(/:/,$tail);
          &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
    #   The user's 'personal' loncapa passworrd file describes how to authenticate:      chomp($upass);
          $upass=&unescape($upass);
    if (-e $passfilename) {  
      Debug("Located password file: $passfilename");      my $pwdcorrect = &validate_user($udom, $uname, $upass);
       if($pwdcorrect) {
    &Reply( $client, "authorized\n", $userinput);
    #
    #  Bad credentials: Failed to authorize
    #
       } else {
    &Failure( $client, "non_authorized\n", $userinput);
       }
   
       my $pf = IO::File->new($passfilename);      return 1;
       my $realpasswd=<$pf>;  
       chomp($realpasswd);  
       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
       my $pwdcorrect=0;  
       #  
       #   Authenticate against password stored in the internal file.  
       #  
      Debug("Authenticating via $howpwd");  
       if ($howpwd eq 'internal') {  
          &Debug("Internal auth");  
          $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);  
       #  
       #   Authenticate against the unix password file.  
       #  
       } elsif ($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 764  RegisterHandler("auth", \&AuthenticateHa Line 1564  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);     
    $upass=&unescape($upass);      my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
    $npass=&unescape($npass);  
    &Debug("Trying to change password for $uname");      $upass=&unescape($upass);
    my $proname=propath($udom,$uname);      $npass=&unescape($npass);
    my $passfilename="$proname/passwd";      &Debug("Trying to change password for $uname");
    if (-e $passfilename) {  
       my $realpasswd;      # First require that the user can be authenticated with their
       {       # old password:
          my $pf = IO::File->new($passfilename);  
          $realpasswd=<$pf>;       my $validated = &validate_user($udom, $uname, $upass);
       }      if($validated) {
       chomp($realpasswd);   my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
       if ($howpwd eq 'internal') {   my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
          &Debug("internal auth");   if ($howpwd eq 'internal') {
          if (crypt($upass,$contentpwd) eq $contentpwd) {      &Debug("internal auth");
             my $salt=time;      my $salt=time;
             $salt=substr($salt,6,2);      $salt=substr($salt,6,2);
             my $ncpass=crypt($npass,$salt);      my $ncpass=crypt($npass,$salt);
                {      if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
                   my $pf = IO::File->new(">$passfilename");   &logthis("Result of password change for "
                   if ($pf) {   ."$uname: pwchange_success");
                      print $pf "internal:$ncpass\n";   &Reply($client, "ok\n", $userinput);
                      &logthis("Result of password change for "      } else {
                               ."$uname: pwchange_success");   &logthis("Unable to open $uname passwd "               
                      Reply($client, "ok\n", $userinput);   ."to change password");
                   } else {   &Failure( $client, "non_authorized\n",$userinput);
                      &logthis("Unable to open $uname passwd "                     }
                               ."to change password");   } elsif ($howpwd eq 'unix') {
                      Failure( $client, "non_authorized\n",$userinput);      my $result = &change_unix_password($uname, $npass);
                   }      &logthis("Result of password change for $uname: ".
                }                    $result);
          } else {      &Reply($client, "$result\n", $userinput);
             Failure($client, "non_authorized\n", $userinput);   } else {
          }      # this just means that the current password mode is not
       } elsif ($howpwd eq 'unix') {      # one we know how to change (e.g the kerberos auth modes or
          # Unix means we have to access /etc/password      # locally written auth handler).
          # one way or another.      #
          # First: Make sure the current password is      &Failure( $client, "auth_mode_error\n", $userinput);
          #        correct   }  
          &Debug("auth is unix");  
          $contentpwd=(getpwnam($uname))[1];      } else {
          my $pwdcorrect = "0";   &Failure( $client, "non_authorized\n", $userinput);
          my $pwauth_path="/usr/local/sbin/pwauth";      }
          unless ($contentpwd eq 'x') {  
             $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);      return 1;
          } elsif (-e $pwauth_path) {  
             open PWAUTH, "|$pwauth_path" or  
                die "Cannot invoke authentication";  
             print PWAUTH "$uname\n$upass\n";  
             close PWAUTH;  
             &Debug("exited pwauth with $? ($uname,$upass) ");  
             $pwdcorrect=($? == 0);  
          }  
          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 875  RegisterHandler("passwd", \&ChangePasswo Line 1640  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\n", $userinput);
          Failure($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 941  RegisterHandler("makeuser", \&AddUserHan Line 1705  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, "$result\n")
    } else {
       &Failure($client, "$result\n");
    }
       } 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 981  RegisterHandler("changeuserauth", \&Chan Line 1786  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 1021  RegisterHandler("home", \&IsHomeHandler, Line 1825  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 $reply=&reply("unsub:$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 $remoteurl=&reply("sub:$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;
 }  }
 RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);  &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']});
       $url = &declutter($url);
       $url =~ s-\.meta$--;
       my $id = &escape('meta:'.$url);
       $memcache->delete($id);
   }
   
   sub declutter {
       my $thisfn=shift;
       $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
       $thisfn=~s/^\///;
       $thisfn=~s|^adm/wrapper/||;
       $thisfn=~s|^adm/coursedocs/showdoc/||;
       $thisfn=~s/^res\///;
       $thisfn=~s/\?.+$//;
       return $thisfn;
   }
 #  #
 #   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 1091  RegisterHandler("update", \&UpdateResour Line 1920  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;
 }  }
 RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);  &register_handler("renameuserfile", \&rename_user_file_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\n";
       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\n";
    } else {
       foreach my $envname (keys(%disk_env)) {
    if ($envname=~ m|^userfile\.\Q$fname\E|) {
       $reply="ok\n";
       last;
    }
       }
    }
    untie(%disk_env);
    close(ENVIN);
    &Reply($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 1184  RegisterHandler("tokenauthuserfile", \&A Line 2159  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 1210  RegisterHandler("unusb", \&UnsubscribeHa Line 2187  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 version of a resource (?) Or is it return
Line 1235  RegisterHandler("sub", \&SubscribeHandle Line 2211  RegisterHandler("sub", \&SubscribeHandle
 #     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 1259  RegisterHandler("currentversion", \&Curr Line 2233  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 1296  RegisterHandler("log", \&ActivityLogEntr Line 2271  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);  
          }  
       } else {  
          Failure( $client, "error: ".($!)." tie(GDBM) Failed ".  
          "while attempting put\n", $userinput);  
       }  
    } else {  
       Failure( $client, "refused\n", $userinput);  
    }  
      
    return 1;  
 }  }
 RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);  &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
   
   #   Put a piece of new data in hash, returns error if entry already exists
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub newput_user_profile_entry {
       my ($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;
   }
   &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 1357  RegisterHandler("put", \&PutUserProfileE Line 2376  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 1425  RegisterHandler("inc", \&IncrementUserVa Line 2441  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 1488  RegisterHandler("rolesput", \&RolesPutHa Line 2501  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 1553  RegisterHandler("rolesdel", \&RolesDelet Line 2555  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 $replystring = read_profile($udom, $uname, $namespace, $what);
    my @queries=split(/\&/,$what);      my ($first) = split(/:/,$replystring);
    my $proname=propath($udom,$uname);      if($first ne "error") {
    my $qresult='';   &Reply($client, "$replystring\n", $userinput);
    my %hash;      } else {
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {   &Failure($client, $replystring." while attempting get\n", $userinput);
       for (my $i=0;$i<=$#queries;$i++) {      }
          $qresult.="$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 1609  RegisterHandler("get", \&GetProfileEntry Line 2595  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 1673  RegisterHandler("eget", \&GetProfileEncr Line 2647  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 1725  RegisterHandler("del", \&DeleteProfileEn Line 2691  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\n", $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 1775  RegisterHandler("keys", \&GetProfileKeys Line 2739  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\n", $userinput);
          Reply($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 1851  RegisterHandler("currentdump", \&DumpPro Line 2814  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\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting dump\n", $userinput);
    }
     } else {      } else {
       Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting dump\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("dump", \&dump_with_regexp, 0, 1, 0);
   
 #  Store an aitem in any database but the roles database.  #  Store a set of key=value pairs associated with a versioned name.
 #  #
 #  Parameters:  #  Parameters:
 #    $cmd                - Request command keyword.  #    $cmd                - Request command keyword.
Line 1916  RegisterHandler("dump", \&DumpWithRegexp Line 2891  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 store_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,$what) =split(/:/,$tail);
   $namespace=~s/\//\_/g;      if ($namespace ne 'roles') {
   $namespace=~s/\W//g;  
   if ($namespace ne 'roles') {   chomp($what);
     chomp($what);   my @pairs=split(/\&/,$what);
     my $proname=propath($udom,$uname);   my $hashref  = &tie_user_hash($udom, $uname, $namespace,
     my $now=time;         &GDBM_WRCREAT(), "S",
     unless ($namespace=~/^nohist\_/) {         "$rid:$what");
       my $hfh;   if ($hashref) {
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {      my $now = time;
  print $hfh "P:$now:$rid:$what\n";       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", $userinput);
    }
       } else {
    &Failure($client, "refused\n", $userinput);
     }      }
     my @pairs=split(/\&/,$what);  
     my %hash;      return 1;
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",  }
     &GDBM_WRCREAT(),0640)) {  &register_handler("store", \&store_handler, 0, 1, 0);
       my @previouskeys=split(/&/,$hash{"keys:$rid"});  
       my $key;  #  Modify a set of key=value pairs associated with a versioned name.
       $hash{"version:$rid"}++;  #
       my $version=$hash{"version:$rid"};  #  Parameters:
       my $allkeys='';   #    $cmd                - Request command keyword.
       foreach my $pair (@pairs) {  #    $tail               - Tail of the request.  This is a colon
  my ($key,$value)=split(/=/,$pair);  #                          separated list containing:
  $allkeys.=$key.':';  #                          domain/user - User and authentication domain.
  $hash{"$version:$rid:$key"}=$value;  #                          namespace   - Name of the database being modified
       }  #                          rid         - Resource keyword to modify.
       $hash{"$version:$rid:timestamp"}=$now;  #                          v           - Version item to modify
       $allkeys.='timestamp';  #                          what        - new value associated with rid.
       $hash{"$version:keys:$rid"}=$allkeys;  #
       if (untie(%hash)) {  #    $client             - Socket open on the client.
  Reply($client, "ok\n", $userinput);  #
       } else {  #
  Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  #  Returns:
  "while attempting store\n", $userinput);  #      1 (keep on processing).
       }  #  Side-Effects:
   #    Writes to the client
   sub putstore_handler {
       my ($cmd, $tail, $client) = @_;
    
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
       if ($namespace ne 'roles') {
   
    chomp($what);
    my $hashref  = &tie_user_hash($udom, $uname, $namespace,
          &GDBM_WRCREAT(), "M",
          "$rid:$v:$what");
    if ($hashref) {
       my $now = time;
       my %data = &hash_extract($what);
       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 {      } else {
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "refused\n", $userinput);
        "while attempting store\n", $userinput);  
     }      }
   } else {  
     Failure($client, "refused\n", $userinput);  
   }  
   
   return 1;      return 1;
   }
   &register_handler("putstore", \&putstore_handler, 0, 1, 0);
   
   sub hash_extract {
       my ($str)=@_;
       my %hash;
       foreach my $pair (split(/\&/,$str)) {
    my ($key,$value)=split(/=/,$pair);
    $hash{$key}=$value;
       }
       return (%hash);
 }  }
 RegisterHandler("store", \&StoreHandler, 0, 1, 0);  sub hash_to_str {
       my ($hash_ref)=@_;
       my $str;
       foreach my $key (keys(%$hash_ref)) {
    $str.=$key.'='.$hash_ref->{$key}.'&';
       }
       $str=~s/\&$//;
       return $str;
   }
   
 #  #
 #   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 1985  RegisterHandler("store", \&StoreHandler, Line 3033  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 $qresult='';      my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
   my %hash;      $namespace=~s/\//\_/g;
   if (tie(%hash,'GDBM_File',"$proname/$namespace.db",      $namespace=~s/\W//g;
   &GDBM_READER(),0640)) {      chomp($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\n", $userinput);
      }   } else {
   } else {      &Failure($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 2050  RegisterHandler("restor", \&RestoreHandl Line 3103  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 2075  RegisterHandler("chatsend", \&SendChatHa Line 3128  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 $userinput = "$cmd:$tail";  
       my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
   my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);      my $reply='';
   my $reply='';      foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
   foreach (&getchat($cdom,$cnum,$udom,$uname)) {   $reply.=&escape($_).':';
     $reply.=&escape($_).':';      }
   }      $reply=~s/\:$//;
   $reply=~s/\:$//;      &Reply($client, $reply."\n", $userinput);
   Reply($client, $reply."\n", $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 2119  RegisterHandler("chatretr", \&RetrieveCh Line 3174  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 2161  RegisterHandler("querysend", \&SendQuery Line 3215  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 2201  RegisterHandler("queryreply", \&ReplyQue Line 3254  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 2208  RegisterHandler("queryreply", \&ReplyQue Line 3269  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 $pair (@pairs) {  
       my ($key,$value)=split(/=/,$pair);              my @current_items = split(/:/,$hashref->{$key});
       $hash{$key}=$value.':'.$now;              shift(@current_items); # remove description
     }              pop(@current_items);   # remove last access
     if (untie(%hash)) {              my $numcurrent = scalar(@current_items);
       Reply($client, "ok\n", $userinput);  
               my @new_items = split(/:/,$courseinfo);
               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);
   
 #  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 2263  RegisterHandler("courseidput", \&PutCour Line 3338  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.
 #     $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 $client = shift;      my $userinput = "$cmd:$tail";
   
   my $userinput = "$cmd:$tail";      my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
           $typefilter,$regexp_ok) =split(/:/,$tail);
   my ($udom,$since,$description) =split(/:/,$tail);      if (defined($description)) {
   if (defined($description)) {   $description=&unescape($description);
     $description=&unescape($description);      } else {
   } else {   $description='.';
     $description='.';  
   }  
   unless (defined($since)) { $since=0; }  
   my $qresult='';  
   my $proname = "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";  
   my %hash;  
   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {  
     while (my ($key,$value) = each(%hash)) {  
       my ($descr,$lasttime)=split(/\:/,$value);  
       if ($lasttime<$since) {   
  next;   
       }  
       if ($description eq '.') {  
  $qresult.=$key.'='.$descr.'&';  
       } else {  
  my $unescapeVal = &unescape($descr);  
  if (eval('$unescapeVal=~/$description/i')) {  
   $qresult.="$key=$descr&";  
  }  
       }  
     }      }
     if (untie(%hash)) {      if (defined($instcodefilter)) {
       chop($qresult);          $instcodefilter=&unescape($instcodefilter);
       Reply($client, "$qresult\n", $userinput);  
     } else {      } else {
       Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".          $instcodefilter='.';
       "while attempting courseiddump\n", $userinput);      }
       my ($ownerunamefilter,$ownerdomfilter);
       if (defined($ownerfilter)) {
           $ownerfilter=&unescape($ownerfilter);
           if ($ownerfilter ne '.' && defined($ownerfilter)) {
               if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
                    $ownerunamefilter = $1;
                    $ownerdomfilter = $2;
               } else {
                   $ownerunamefilter = $ownerfilter;
                   $ownerdomfilter = '';
               }
           }
       } else {
           $ownerfilter='.';
     }      }
   } else {  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
     "while attempting courseiddump\n", $userinput);  
   }  
   
       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);
       }
   
   return 1;      unless (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 ($descr,$lasttime,$inst_code,$owner,$type);
               my @courseitems = split(/:/,$value);
               $lasttime = pop(@courseitems);
       ($descr,$inst_code,$owner,$type)=@courseitems;
       if ($lasttime<$since) { next; }
               my $match = 1;
       unless ($description eq '.') {
    my $unescapeDescr = &unescape($descr);
    unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
                       $match = 0;
    }
               }
               unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
                   my $unescapeInstcode = &unescape($inst_code);
                   if ($regexp_ok) {
                       unless (eval('$unescapeInstcode=~/$instcodefilter/')) {
                           $match = 0;
                       }
                   } else {
                       unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
                           $match = 0;
                       }
                   }
       }
               unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
                   my $unescapeOwner = &unescape($owner);
                   if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
                       if ($unescapeOwner =~ /:/) {
                           if (eval('$unescapeOwner !~ 
                                /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i')) {
                               $match = 0;
                           } 
                       } else {
                           if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) {
                               $match = 0;
                           }
                       }
                   } elsif ($ownerunamefilter ne '') {
                       if ($unescapeOwner =~ /:/) {
                           if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E:[^:]+$/i')) {
                                $match = 0;
                           }
                       } else {
                           if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) {
                               $match = 0;
                           }
                       }
                   } elsif ($ownerdomfilter ne '') {
                       if ($unescapeOwner =~ /:/) {
                           if (eval('$unescapeOwner!~/^[^:]+:\Q$ownerdomfilter\E/')) {
                                $match = 0;
                           }
                       } else {
                           if ($ownerdomfilter ne $udom) {
                               $match = 0;
                           }
                       }
                   }
               }
               unless ($coursefilter eq '.' || !defined($coursefilter)) {
                   my $unescapeCourse = &unescape($key);
                   unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
                       $match = 0;
                   }
               }
               unless ($typefilter eq '.' || !defined($typefilter)) {
                   my $unescapeType = &unescape($type);
                   if ($type eq '') {
                       if ($typefilter ne 'Course') {
                           $match = 0;
                       }
                   } else { 
                       unless (eval('$unescapeType=~/^\Q$typefilter\E$/')) {
                           $match = 0;
                       }
                   }
               }
               if ($match == 1) {
                   $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
               }
    }
    if (&untie_domain_hash($hashref)) {
       chop($qresult);
       &Reply($client, "$qresult\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting courseiddump\n", $userinput);
       }
   
   
       return 1;
 }  }
 RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);  &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
   
 #  #
 #  Puts an id to a domains id database.   #  Puts an id to a domains id database. 
 #  #
Line 2332  RegisterHandler("courseiddump", \&DumpCo Line 3517  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 2391  RegisterHandler("idput", \&PutIdHandler, Line 3567  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);
   my ($udom,$what)=split(/:/,$tail);      chomp($what);
   chomp($what);      my @queries=split(/\&/,$what);
   $udom=~s/\W//g;      my $qresult='';
   my $proname="$perlvar{'lonUsersDir'}/$udom/ids";      my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
   my @queries=split(/\&/,$what);      if ($hashref) {
   my $qresult='';   for (my $i=0;$i<=$#queries;$i++) {
   my %hash;      $qresult.="$hashref->{$queries[$i]}&";
   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {   }
     for (my $i=0;$i<=$#queries;$i++) {   if (&untie_domain_hash($hashref)) {
       $qresult.="$hash{$queries[$i]}&";      $qresult=~s/\&$//;
     }      &Reply($client, "$qresult\n", $userinput);
     if (untie(%hash)) {   } else {
       $qresult=~s/\&$//;      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
       Reply($client, "$qresult\n", $userinput);        "while attempting idget\n",$userinput);
    }
     } else {      } else {
       Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting idget\n",$userinput);   "while attempting idget\n",$userinput);
     }      }
   } else {      
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      return 1;
                         "while attempting idget\n",$userinput);  
   }  
   
   return 1;  
 }  }
 RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);  &register_handler("idget", \&get_id_handler, 0, 1, 0);
 #------------------------------------------------------------------------------------  
 #  #
 #   Process a Request.  Takes a request from the client validates  # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
 #   it and performs the operation requested by it.  Returns  
 #   a response to the client.  
 #  #
 #  Parameters:  # Parameters
 #      request      - A string containing the user's request.  #   $cmd       - Command keyword that caused us to be dispatched.
 #  Returns:  #   $tail      - Tail of the command.  Consists of a colon separated:
 #      0            - Requested to exit, caller should shut down.  #               domain - the domain whose dcmail we are recording
 #      1            - Accept additional requests from the client.  #               email    Consists of key=value pair 
   #                        where key is unique msgid
   #                        and value is message (in XML)
   #   $client    - Socket open on the client.
 #  #
 sub ProcessRequest {  # Returns:
    my $Request      = shift;  #    1 - indicating processing should continue.
    my $KeepGoing    = 1; # Assume we're not asked to stop.  # Side effects
       #     reply is written to $client.
    my $wasenc=0;  #
    my $userinput = $Request;   # for compatibility with oldcode <yeach>  sub put_dcmail_handler {
       my ($cmd,$tail,$client) = @_;
       my $userinput = "$cmd:$tail";
 # ------------------------------------------------------------ See if encrypted                                                                                  
          my ($udom,$what)=split(/:/,$tail);
    if($userinput =~ /^enc/) {      chomp($what);
       $wasenc = 1;      my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
       $userinput = Decipher($userinput);      if ($hashref) {
       if(! $userinput) {          my ($key,$value)=split(/=/,$what);
          Failure($client,"error:Encrypted data without negotiating key");          $hashref->{$key}=$value;
          return 0;                      # Break off with this imposter.      }
       }      if (&untie_domain_hash($hashref)) {
    }          &Reply($client, "ok\n", $userinput);
    # Split off the request keyword from the rest of the stuff.      } else {
              &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    my ($command, $tail) = split(/:/, $userinput, 2);                   "while attempting dcmailput\n", $userinput);
       }
    Debug("Command received: $command, encoded = $wasenc");      return 1;
   }
      &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
 # ------------------------------------------------------------- Normal commands  
   
    #   
    #   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];  
       Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");  
         
       #  Validate the request:  
         
       my $ok = 1;  
       my $requesterprivs = 0;  
       if(isClient()) {  
  $requesterprivs |= $CLIENT_OK;  
       }  
       if(isManager()) {  
  $requesterprivs |= $MANAGER_OK;  
       }  
       if($NeedEncode && (!$wasenc)) {  
  Debug("Must encode but wasn't: $NeedEncode $wasenc");  
          $ok = 0;  
       }  
       if(($ClientTypes & $requesterprivs) == 0) {  
  Debug("Client not privileged to do this operation");  
  $ok = 0;  
       }  
   
       if($ok) {  
  Debug("Dispatching to handler $command $tail");  
          $KeepGoing = &$Handler($command, $tail, $client);  
       } else {  
  Debug("Refusing to dispatch because ok is false");  
  Failure($client, "refused", $userinput);  
       }  
   
   
   #
   # Retrieves broadcast e-mail from nohist_dcmail database
   # Returns to client an & separated list of key=value pairs,
   # where key is msgid and value is message information.
   #
   # 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 table we dump
   #               startfilter - beginning of time window 
   #               endfilter - end of time window
   #               sendersfilter - & separated list of username:domain 
   #                 for senders to search for.
   #   $client    - Socket open on the client.
   #
   # 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\n", $userinput);
           } else {
               &Failure($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);
   
   #
   # 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.
   #
   
 # ---------------------------------------------------------------------- tmpput  sub put_domainroles_handler {
    } elsif ($userinput =~ /^tmpput/) {      my ($cmd,$tail,$client) = @_;
       if(isClient) {  
          my ($cmd,$what)=split(/:/,$userinput);  
          my $store;  
          $tmpsnum++;  
          my $id=$$.'_'.$clientip.'_'.$tmpsnum;  
          $id=~s/\W/\_/g;  
          $what=~s/\n//g;  
          my $execdir=$perlvar{'lonDaemons'};  
          if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {  
             print $store $what;  
             close $store;  
             Reply($client, "$id\n", $userinput);  
          }  
          else {  
             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".  
                            "while attempting tmpput\n", $userinput);  
          }  
       } else {  
          Failure($client, "refused\n", $userinput);  
       
       }  
   
 # ---------------------------------------------------------------------- tmpget  
    } elsif ($userinput =~ /^tmpget/) {  
       if(isClient) {  
          my ($cmd,$id)=split(/:/,$userinput);  
          chomp($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\n", $userinput);  
             close $store;  
          }  
          else {  
             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".  
                                "while attempting tmpget\n", $userinput);  
          }  
       } else {  
          Failure($client, "refused\n", $userinput);  
       
       }  
 # ---------------------------------------------------------------------- tmpdel  
    } elsif ($userinput =~ /^tmpdel/) {  
       if(isClient) {  
          my ($cmd,$id)=split(/:/,$userinput);  
          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 {  
             $ulsout='no_such_dir';  
          }  
          if ($ulsout eq '') { $ulsout='empty'; }  
          Reply($client, "$ulsout\n", $userinput);  
       } else {  
          Failure($client, "refused\n", $userinput);  
       
       }  
 # ----------------------------------------------------------------- setannounce  
    } elsif ($userinput =~ /^setannounce/) {  
       if (isClient) {  
          my ($cmd,$announcement)=split(/:/,$userinput);  
          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", $userinput);  
          }  
       } else {  
          Failure($client, "refused\n", $userinput);  
       
       }  
 # ------------------------------------------------------------------ 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;      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);
   
 #  #
 #   GetCertificate: Given a transaction that requires a certificate,  # Retrieves domain roles from nohist_domainroles database
 #   this function will extract the certificate from the transaction  # Returns to client an & separated list of key=value pairs,
 #   request.  Note that at this point, the only concept of a certificate  # where key is role and value is start and end date information.
 #   is the hostname to which we are connected.  
 #  #
 #   Parameter:  # Parameters
 #      request   - The request sent by our client (this parameterization may  #   $cmd       - Command keyword that caused us to be dispatched.
 #                  need to change when we really use a certificate granting  #   $tail      - Tail of the command.  Consists of a colon separated:
 #                  authority.  #               domain - the domain whose domain roles table we dump
   #   $client    - Socket open on the client.
 #  #
 sub GetCertificate {  # Returns:
     my $request = shift;  #    1 - indicating processing should continue.
   # Side effects
     return $clientip;  #     reply (& separated list of role=start/end info pairs) is
   #     written to $client.
   #
   sub dump_domainroles_handler {
       my ($cmd, $tail, $client) = @_;
                                                                                              
       my $userinput = "$cmd:$tail";
       my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
       chomp($rolesfilter);
       my @roles = ();
       if (defined($startfilter)) {
           $startfilter=&unescape($startfilter);
       } else {
           $startfilter='.';
       }
       if (defined($endfilter)) {
           $endfilter=&unescape($endfilter);
       } else {
           $endfilter='.';
       }
       if (defined($rolesfilter)) {
           $rolesfilter=&unescape($rolesfilter);
    @roles = split(/\&/,$rolesfilter);
       }
                                                                                              
       my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
       if ($hashref) {
           my $qresult = '';
           while (my ($key,$value) = each(%$hashref)) {
               my $match = 1;
               my ($start,$end) = split(/:/,&unescape($value));
               my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
               unless ($startfilter eq '.' || !defined($startfilter)) {
                   if ($start >= $startfilter) {
                       $match = 0;
                   }
               }
               unless ($endfilter eq '.' || !defined($endfilter)) {
                   if ($end <= $endfilter) {
                       $match = 0;
                   }
               }
               unless (@roles < 1) {
                   unless (grep/^$trole$/,@roles) {
                       $match = 0;
                   }
               }
               if ($match == 1) {
                   $qresult.=$key.'='.$value.'&';
               }
           }
           if (&untie_domain_hash($hashref)) {
               chop($qresult);
               &Reply($client, "$qresult\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                       "while attempting domrolesdump\n", $userinput);
           }
       } else {
           &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   "while attempting domrolesdump\n", $userinput);
       }
       return 1;
 }  }
   
   &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?
 #  #
 #   ReadManagerTable: Reads in the current manager table. For now this is  # Parameters:
 #                     done on each manager authentication because:  #    $cmd     - The command that got us dispatched.
 #                     - These authentications are not frequent  #    $tail    - The remainder of the request following $cmd:
 #                     - This allows dynamic changes to the manager table  #               In this case this will be the contents of the file.
 #                       without the need to signal to the lond.  #    $client  - Socket connected to the client.
 #  # Returns:
   #    1 indicating processing can continue.
   # Side effects:
   #   A file is created in the local filesystem.
   #   A reply is sent to the client.
   sub tmp_put_handler {
       my ($cmd, $what, $client) = @_;
   
       my $userinput = "$cmd:$what"; # Reconstruct for logging.
   
 sub ReadManagerTable {  
   
     #   Clean out the old table first..      my $store;
       $tmpsnum++;
       my $id=$$.'_'.$clientip.'_'.$tmpsnum;
       $id=~s/\W/\_/g;
       $what=~s/\n//g;
       my $execdir=$perlvar{'lonDaemons'};
       if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
    print $store $what;
    close $store;
    &Reply($client, "$id\n", $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);
   
    foreach my $key (keys %managers) {  #   Processes the tmpget command.  This command returns the contents
       delete $managers{$key};  #  of a temporary resource file(?) created via tmpput.
    }  #
   # Paramters:
   #    $cmd      - Command that got us dispatched.
   #    $id       - Tail of the command, contain the id of the resource
   #                we want to fetch.
   #    $client   - socket open on the client.
   # Return:
   #    1         - Inidcating processing can continue.
   # Side effects:
   #   A reply is sent to the client.
   #
   sub tmp_get_handler {
       my ($cmd, $id, $client) = @_;
   
    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";      my $userinput = "$cmd:$id"; 
    if (!open (MANAGERS, $tablename)) {      
       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');  
       return;      $id=~s/\W/\_/g;
    }      my $store;
    while(my $host = <MANAGERS>) {      my $execdir=$perlvar{'lonDaemons'};
       chomp($host);      if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
       if ($host =~ "^#") {                  # Comment line.   my $reply=<$store>;
          logthis('<font color="green"> Skipping line: '. "$host</font>\n");   &Reply( $client, "$reply\n", $userinput);
          next;   close $store;
       }      } else {
       if (!defined $hostip{$host}) { # This is a non cluster member   &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
     #  The entry is of the form:    "while attempting tmpget\n", $userinput);
     #    cluname:hostname      }
     #  cluname - A 'cluster hostname' is needed in order to negotiate  
     #            the host key.      return 1;
     #  hostname- The dns name of the host.  
     #  
           my($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("tmpget", \&tmp_get_handler, 0, 1, 0);
   
 #  #
 #  ValidManager: Determines if a given certificate represents a valid manager.  #  Process the tmpdel command.  This command deletes a temp resource
 #                in this primitive implementation, the 'certificate' is  #  created by the tmpput command.
 #                just the connecting loncapa client name.  This is checked  
 #                against a valid client list in the configuration.  
 #  #
 #                    # Parameters:
 sub ValidManager {  #   $cmd      - Command that got us here.
     my $certificate = shift;   #   $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;
   
     return isManager;  
 }  }
   &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
   
   #
   #   Processes the setannounce command.  This command
   #   creates a file named announce.txt in the top directory of
   #   the documentn root and sets its contents.  The announce.txt file is
   #   printed in its entirety at the LonCAPA login page.  Note:
   #   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.
 #  #
 #  CopyFile:  Called as part of the process of installing a   
 #             new configuration file.  This function copies an existing  
 #             file to a backup file.  
 # Parameters:  # Parameters:
 #     oldfile  - Name of the file to backup.  #    $cmd          - The command that got us dispatched.
 #     newfile  - Name of the backup file.  #    $announcement - The text of the announcement.
 # Return:  #    $client       - Socket open on the client process.
 #     0   - Failure (errno has failure reason).  # Retunrns:
 #     1   - Success.  #   1             - Indicating request processing should continue
   # Side Effects:
   #   The file {DocRoot}/announcement.txt is created.
   #   A reply is sent to $client.
 #  #
 sub CopyFile {  sub set_announce_handler {
     my $oldfile = shift;      my ($cmd, $announcement, $client) = @_;
     my $newfile = shift;    
       my $userinput    = "$cmd:$announcement";
   
     #  The file must exist:      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);
       }
   
     if(-e $oldfile) {      return 1;
   }
   &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
   
  # Read the old file.  #
   #  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 $oldfh = IO::File->new("< $oldfile");      my $userinput  = $cmd.$tail;
  if(!$oldfh) {      
     return 0;      &Reply($client, &version($userinput)."\n", $userinput);
  }  
  my @contents = <$oldfh>;  # Suck in the entire file.  
   
  # write the backup file:  
   
  my $newfh = IO::File->new("> $newfile");      return 1;
  if(!(defined $newfh)){  }
     return 0;  &register_handler("version", \&get_version_handler, 0, 1, 0);
  }  
  my $lines = scalar @contents;  
  for (my $i =0; $i < $lines; $i++) {  
     print $newfh ($contents[$i]);  
  }  
   
  $oldfh->close;  #  Set the current host and domain.  This is used to support
  $newfh->close;  #  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).
   #    $socket   - Socket open on the client.
   #
   # Returns:
   #     1   - Indicates the program should continue to process requests.
   # Side-effects:
   #     The default domain/system context is modified for this daemon.
   #     a reply is sent to the client.
   #
   sub set_virtual_host_handler {
       my ($cmd, $tail, $socket) = @_;
     
       my $userinput  ="$cmd:$tail";
   
  chmod(0660, $newfile);      &Reply($client, &sethost($userinput)."\n", $userinput);
   
  return 1;  
           return 1;
     } else {  
  return 0;  
     }  
 }  }
 #  &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
 #  Host files are passed out with externally visible host IPs.  
 #  If, for example, we are behind a fire-wall or NAT host, our   #  Process a request to exit:
 #  internally visible IP may be different than the externally  #   - "bye" is sent to the client.
 #  visible IP.  Therefore, we always adjust the contents of the  #   - The client socket is shutdown and closed.
 #  host file so that the entry for ME is the IP that we believe  #   - We indicate to the caller that we should exit.
 #  we have.  At present, this is defined as the entry that  # Formal Parameters:
 #  DNS has for us.  If by some chance we are not able to get a  #   $cmd                - The command that got us here.
 #  DNS translation for us, then we assume that the host.tab file  #   $tail               - Tail of the command (empty).
 #  is correct.    #   $client             - Socket open on the tail.
 #    BUGBUGBUG - in the future, we really should see if we can  
 #       easily query the interface(s) instead.  
 # Parameter(s):  
 #     contents    - The contents of the host.tab to check.  
 # Returns:  # Returns:
 #     newcontents - The adjusted contents.  #   0      - Indicating the program should exit!!
 #  #
 #  sub exit_handler {
 sub AdjustHostContents {      my ($cmd, $tail, $client) = @_;
     my $contents  = shift;  
     my $adjusted;  
     my $me        = $perlvar{'lonHostID'};  
   
  foreach my $line (split(/\n/,$contents)) {      my $userinput = "$cmd:$tail";
  if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {  
     chomp($line);      &logthis("Client $clientip ($clientname) hanging up: $userinput");
     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);      &Reply($client, "bye\n", $userinput);
     if ($id eq $me) {      $client->shutdown(2);        # shutdown the socket forcibly.
           my $ip = gethostbyname($name);      $client->close();
           my $ipnew = inet_ntoa($ip);  
          $ip = $ipnew;      return 0;
  #  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("exit", \&exit_handler, 0,1,1);
   &register_handler("init", \&exit_handler, 0,1,1);
   &register_handler("quit", \&exit_handler, 0,1,1);
   
   #  Determine if auto-enrollment is enabled.
   #  Note that the original had what I believe to be a defect.
   #  The original returned 0 if the requestor was not a registerd client.
   #  It should return "refused".
   # Formal Parameters:
   #   $cmd       - The command that invoked us.
   #   $tail      - The tail of the command (Extra command parameters.
   #   $client    - The socket open on the client that issued the request.
   # Returns:
   #    1         - Indicating processing should continue.
 #  #
 #   InstallFile: Called to install an administrative file:  sub enrollment_enabled_handler {
 #       - The file is created with <name>.tmp      my ($cmd, $tail, $client) = @_;
 #       - The <name>.tmp file is then mv'd to <name>      my $userinput = $cmd.":".$tail; # For logging purposes.
 #   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:  
 #       Name of the file  
 #       File Contents.  
 #  Return:  
 #      nonzero - success.  
 #      0       - failure and $! has an errno.  
 #  
 sub InstallFile {  
     my $Filename = shift;  
     my $Contents = shift;  
     my $TempFile = $Filename.".tmp";  
   
     #  Open the file for write:      
       my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
   
     my $fh = IO::File->new("> $TempFile"); # Write to temp.      my $outcome  = &localenroll::run($cdom);
     if(!(defined $fh)) {      &Reply($client, "$outcome\n", $userinput);
  &logthis('<font color="red"> Unable to create '.$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("autorun", \&enrollment_enabled_handler, 0, 1, 0);
   
     chmod(0660, $TempFile);  #   Get the official sections for which auto-enrollment is possible.
   #   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";
   
     # Now we can move install the file in position.      my ($coursecode, $cdom) = split(/:/, $tail);
       my @secs = &localenroll::get_sections($coursecode,$cdom);
       my $seclist = &escape(join(':',@secs));
   
       &Reply($client, "$seclist\n", $userinput);
           
     move($TempFile, $Filename);  
   
     return 1;      return 1;
 }  }
   &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
   
   #   Validate the owner of a new course section.  
 #  #
 #   ConfigFileFromSelector: converts a configuration file selector  # Formal Parameters:
 #                 (one of host or domain at this point) into a   #   $cmd      - Command that got us dispatched.
 #                 configuration file pathname.  #   $tail     - the remainder of the command.  For us this consists of a
   #               colon separated string containing:
   #                  $inst    - Course Id from the institutions point of view.
   #                  $owner   - Proposed owner of the course.
   #                  $cdom    - Domain of the course (from the institutions
   #                             point of view?)..
   #   $client   - Socket open on the client.
 #  #
 #  Parameters:  # Returns:
 #      selector  - Configuration file selector.  #   1        - Processing should continue.
 #  Returns:  
 #      Full path to the file or undef if the selector is invalid.  
 #  #
 sub ConfigFileFromSelector {  sub validate_course_owner_handler {
     my $selector   = shift;      my ($cmd, $tail, $client)  = @_;
     my $tablefile;      my $userinput = "$cmd:$tail";
       my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
   
       $owner = &unescape($owner);
       my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
       &Reply($client, "$outcome\n", $userinput);
   
     my $tabledir = $perlvar{'lonTabDir'}.'/';  
     if ($selector eq "hosts") {  
  $tablefile = $tabledir."hosts.tab";  
     } elsif ($selector eq "domain") {  
  $tablefile = $tabledir."domain.tab";  
     } else {  
  return undef;  
     }  
     return $tablefile;  
   
   
       return 1;
 }  }
   &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
   
 #  #
 #   PushFile:  Called to do an administrative push of a file.  #   Validate a course section in the official schedule of classes
 #              - Ensure the file being pushed is one we support.  #   from the institutions point of view (part of autoenrollment).
 #              - 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 {  # Formal Parameters:
     my $request = shift;      #   $cmd          - The command request that got us dispatched.
     my ($command, $filename, $contents) = split(":", $request, 3);  #   $tail         - The tail of the command.  In this case,
       #                   this is a colon separated set of words that will be split
     #  At this point in time, pushes for only the following tables are  #                   into:
     #  supported:  #                        $inst_course_id - The course/section id from the
     #   hosts.tab  ($filename eq host).  #                                          institutions point of view.
     #   domain.tab ($filename eq domain).  #                        $cdom           - The domain from the institutions
     # Construct the destination filename or reject the request.  #                                          point of view.
     #  #   $client       - Socket open on the client.
     # lonManage is supposed to ensure this, however this session could be  # Returns:
     # part of some elaborate spoof that managed somehow to authenticate.  #    1           - Indicating processing should continue.
     #  #
   sub validate_course_section_handler {
       my ($cmd, $tail, $client) = @_;
     my $tablefile = ConfigFileFromSelector($filename);      my $userinput = "$cmd:$tail";
     if(! (defined $tablefile)) {      my ($inst_course_id, $cdom) = split(/:/, $tail);
  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") {      my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
  $contents = AdjustHostContents($contents);      &Reply($client, "$outcome\n", $userinput);
     }  
   
     #  Install the new file:  
   
     if(!InstallFile($tablefile, $contents)) {      return 1;
  &logthis('<font color="red"> Pushfile: unable to install '  }
  .$tablefile." $! </font>");  &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
  return "error:$!";  
     }  
     else {  
  &logthis('<font color="green"> Installed new '.$tablefile  
  ."</font>");  
   
     }  
   
   #
   #   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.
   #
   
     #  Indicate success:  sub validate_class_access_handler {
        my ($cmd, $tail, $client) = @_;
     return "ok";      my $userinput = "$cmd:$tail";
       my ($inst_class,$courseowner,$cdom) = split(/:/, $tail);
       $courseowner = &unescape($courseowner);
       my $outcome;
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $outcome=&localenroll::check_section($inst_class,$courseowner,$cdom);
       };
       &Reply($client,"$outcome\n", $userinput);
   
       return 1;
 }  }
   &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
   
 #  #
 #  Called to re-init either lonc or lond.  #   Create a password for a new LON-CAPA user added by auto-enrollment.
 #  #   Only used for case where authentication method for new user is localauth
 #  Parameters:  
 #    request   - The full request by the client.  This is of the form  
 #                reinit:<process>    
 #                where <process> is allowed to be either of   
 #                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.  
 #  #
   # 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:
   #               $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 ReinitProcess {  sub create_auto_enroll_password_handler {
     my $request = shift;      my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
   
       my ($authparam, $cdom) = split(/:/, $userinput);
   
     # separate the request (reinit) from the process identifier and      my ($create_passwd,$authchk);
     # validate it producing the name of the .pid file for the process.      ($authparam,
     #       $create_passwd,
     #       $authchk) = &localenroll::create_password($authparam,$cdom);
     my ($junk, $process) = split(":", $request);  
     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';      &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
     if($process eq 'lonc') {     $userinput);
  $processpidfile = $processpidfile."lonc.pid";  
  if (!open(PIDFILE, "< $processpidfile")) {  
     return "error:Open failed for $processpidfile";      return 1;
  }  
  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:  &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
 #   Validation includes:    0, 1, 0);
 #     - Ensuring the command is valid.  
 #     - Ensuring the command has sufficient parameters  #   Retrieve and remove temporary files created by/during autoenrollment.
 #   Parameters:  
 #     scriptline - A line to validate (\n has been stripped for what it's worth).  
 #  #
 #   Return:  # Formal Parameters:
 #      0     - Invalid scriptline.  #    $cmd      - The command that got us dispatched.
 #      1     - Valid scriptline  #    $tail     - The tail of the command.  In our case this is a colon 
 #  NOTE:  #                separated list that will be split into:
 #     Only the command syntax is checked, not the executability of the  #                $filename - The name of the file to remove.
 #     command.  #                            The filename is given as a path relative to
   #                            the LonCAPA temp file directory.
   #    $client   - Socket open on the client.
 #  #
 sub isValidEditCommand {  # Returns:
     my $scriptline = shift;  #   1     - Continue processing.
   sub retrieve_auto_file_handler {
     #   Line elements are pipe separated:      my ($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);
   
     my ($command, $key, $newline)  = split(/\|/, $scriptline);  #   Does this have to be uncommented??!?  (RF).
     &logthis('<font color="green"> isValideditCommand checking: '.  #
      "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");  #                                unlink($source);
       
     if ($command eq "delete") {  
  #  
  #   key with no newline.  
  #  
  if( ($key eq "") || ($newline ne "")) {  
     return 0; # Must have key but no newline.  
  } else {  
     return 1; # Valid syntax.  
  }  
     } elsif ($command eq "replace") {  
  #  
  #   key and newline:  
  #  
  if (($key eq "") || ($newline eq "")) {  
     return 0;  
  } else {  
     return 1;  
  }  
     } elsif ($command eq "append") {  
  if (($key ne "") && ($newline eq "")) {  
     return 1;  
  } else {   } else {
     return 0;      &Failure($client, "error\n", $userinput);
  }   }
     } else {      } else {
  return 0; # Invalid command.   &Failure($client, "error\n", $userinput);
     }      }
     return 0; # Should not get here!!!      
   
       return 1;
 }  }
   &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
   
 #  #
 #   ApplyEdit - Applies an edit command to a line in a configuration   #   Read and retrieve institutional code format (for support form).
 #               file.  It is the caller's responsiblity to validate the  # Formal Parameters:
 #               edit line.  #    $cmd        - Command that dispatched us.
 #   Parameters:  #    $tail       - Tail of the command.  In this case it conatins 
 #      $directive - A single edit directive to apply.    #                  the course domain and the coursename.
 #                   Edit directives are of the form:  #    $client     - Socket open on the client.
 #                  append|newline      - Appends a new line to the file.  # Returns:
 #                  replace|key|newline - Replaces the line with key value 'key'  #    1     - Continue processing.
 #                  delete|key          - Deletes the line with key value 'key'.  
 #      $editor   - A config file editor object that contains the  
 #                  file being edited.  
 #  #
 sub ApplyEdit {  sub get_institutional_code_format_handler {
     my $directive   = shift;      my ($cmd, $tail, $client)   = @_;
     my $editor      = shift;      my $userinput               = "$cmd:$tail";
   
       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 = &hash2str(%codes);
    my $codetitles_str = &array2str(@codetitles);
    my $cat_titles_str = &hash2str(%cat_titles);
    my $cat_order_str = &hash2str(%cat_order);
    &Reply($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);
       }
       
       return 1;
   }
   &register_handler("autoinstcodeformat",
     \&get_institutional_code_format_handler,0,1,0);
   
     # Break the directive down into its command and its parameters  # Get domain specific conditions for import of student photographs to a course
     # (at most two at this point.  The meaning of the parameters, if in fact  #
     #  they exist depends on the command).  # Retrieves information from photo_permission subroutine in localenroll.
   # Returns outcome (ok) if no processing errors, and whether course owner is 
   # required to accept conditions of use (yes/no).
   #
   #    
   sub photo_permission_handler {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $cdom = $tail;
       my ($perm_reqd,$conditions);
       my $outcome;
       eval {
    local($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);
   
     my ($command, $p1, $p2) = split(/\|/, $directive);  #
   # 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);
   
     if($command eq "append") {  #
  $editor->Append($p1);          # p1 - key p2 null.  # Retrieve information from localenroll about whether to provide a button     
     } elsif ($command eq "replace") {  # for users who have enbled import of student photos to initiate an 
  $editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.  # update of photo files for registered students. Also include 
     } elsif ($command eq "delete") {  # comment to display alongside button.  
  $editor->DeleteLine($p1);         # p1 - key p2 null.  
     } else {          # Should not get here!!!  sub photo_choice_handler {
  die "Invalid command given to ApplyEdit $command"      my ($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);
   
 #  #
 # AdjustOurHost:  # Gets a student's photo to exist (in the correct image type) in the user's 
 #           Adjusts a host file stored in a configuration file editor object  # directory.
 #           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:  # Formal Parameters:
 #     editor   - The configuration file editor to adjust.  This  #    $cmd     - The command request that got us dispatched.
 #                editor is assumed to contain a hosts.tab file.  #    $tail    - A colon separated set of words that will be split into:
 # Strategy:  #               $domain - student's domain
 #    - Figure out our hostname.  #               $uname  - student username
 #    - Lookup the entry for this host.  #               $type   - image type desired
 #    - Modify the line to contain our IP  #    $client  - The socket open on the client.
 #    - Do a replace for this host.  # Returns:
 sub AdjustOurHost {  #    1 - continue processing.
     my $editor        = shift;  
   
     # figure out who I am.  
   
     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.  
   
     #  Get my host file entry.  
   
     my $ConfigLine    = $editor->Find($myHostName);  sub student_photo_handler {
     if(! (defined $ConfigLine)) {      my ($cmd, $tail, $client) = @_;
  die "AdjustOurHost - no entry for me in hosts file $myHostName";      my ($domain,$uname,$ext,$type) = split(/:/, $tail);
   
       my $path=&propath($domain,$uname). '/userfiles/internal/';
       my $filename = 'studentphoto.'.$ext;
       if ($type eq 'thumbnail') {
           $filename = 'studentphoto_tn.'.$ext;
     }      }
     # figure out my IP:      if (-e $path.$filename) {
     #   Use the config line to get my hostname.   &Reply($client,"ok\n","$cmd:$tail");
     #   Use gethostbyname to translate that into an IP address.   return 1;
     #  
     my ($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:      &mkpath($path);
       my $file;
       if ($type eq 'thumbnail') {
    eval {
       local($SIG{__DIE__})='DEFAULT';
       $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
    };
       } else {
           $file=&localstudentphoto::fetch($domain,$uname);
       }
       if (!$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;
   }
   &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
   
     $editor->ReplaceLine($id, $newConfigLine);  # mkpath makes all directories for a file, expects an absolute path with a
       # file or a trailing / if just a dir is passed
   # returns 1 on success 0 on failure
   sub mkpath {
       my ($file)=@_;
       my @parts=split(/\//,$file,-1);
       my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
       for (my $i=3;$i<= ($#parts-1);$i++) {
    $now.='/'.$parts[$i]; 
    if (!-e $now) {
       if  (!mkdir($now,0770)) { return 0; }
    }
       }
       return 1;
 }  }
   
   #---------------------------------------------------------------
 #  #
 #   ReplaceConfigFile:  #   Getting, decoding and dispatching requests:
 #              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  = 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);
   
     CopyFile ($filename, $filename.".old");      &Debug("get_request: Request = $input\n");
   
     my $contents  = $editor->Get(); # Get the contents of the file.      &status('Processing '.$clientname.':'.$input);
   
     InstallFile($filename, $contents);      return $input;
 }  }
 #     #---------------------------------------------------------------
 #  #
 #   Called to edit a configuration table  file  #  Process a request.  This sub should shrink as each action
 #   Parameters:  #  gets farmed out into a separat sub that is registered 
 #      request           - The entire command/request sent by lonc or lonManage  #  with the dispatch hash.  
 #   Return:  
 #      The reply to send to the client.  
 #  #
 sub EditFile {  # Parameters:
     my $request = shift;  #    user_input   - The request received from the client (lonc).
   # Returns:
     #  Split the command into it's pieces:  edit:filetype:script  #    true to keep processing, false if caller should exit.
   #
     my ($request, $filetype, $script) = split(/:/, $request,3); # : in script  sub process_request {
       my ($userinput) = @_;      # Easier for now to break style than to
     #  Check the pre-coditions for success:                                  # fix all the userinput -> user_input.
       my $wasenc    = 0; # True if request was encrypted.
     if($request != "edit") { # Something is amiss afoot alack.  # ------------------------------------------------------------ See if encrypted
  return "error:edit request detected, but request != 'edit'\n";      # for command
       # sethost:<server>
       # <command>:<args>
       #   we just send it to the processor
       # 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:$newid";
    }
     }      }
     if( ($filetype ne "hosts")  &&  
  ($filetype ne "domain")) {      if ($userinput =~ /^enc/) {
  return "error:edit requested with invalid file specifier: $filetype \n";   $userinput = decipher($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;
    }
   
     #   Split the edit script and check it's validity.   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 @scriptlines = split(/\n/, $script);  # one line per element.      }    
     my $linecount   = scalar(@scriptlines);  
     for(my $i = 0; $i < $linecount; $i++) {      print $client "unknown_cmd\n";
  chomp($scriptlines[$i]);  # -------------------------------------------------------------------- complete
  if(!isValidEditCommand($scriptlines[$i])) {      Debug("process_request - returning 1");
     return "error:edit with bad script line: '$scriptlines[$i]' \n";      return 1;
   }
   #
   #   Decipher encoded traffic
   #  Parameters:
   #     input      - Encoded data.
   #  Returns:
   #     Decoded data or undef if encryption key was not yet negotiated.
   #  Implicit input:
   #     cipher  - This global holds the negotiated encryption key.
   #
   sub decipher {
       my ($input)  = @_;
       my $output = '';
       
       
       if($cipher) {
    my($enc, $enclength, $encinput) = split(/:/, $input);
    for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
       $output .= 
    $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
  }   }
    return substr($output, 0, $enclength);
       } else {
    return undef;
     }      }
   }
   
     #   Execute the edit operation.  #
     #   - Create a config file editor for the appropriate file and   #   Register a command processor.  This function is invoked to register a sub
     #   - execute each command in the script:  #   to process a request.  Once registered, the ProcessRequest sub can automatically
     #  #   dispatch requests to an appropriate sub, and do the top level validity checking
     my $configfile = ConfigFileFromSelector($filetype);  #   as well:
     if (!(defined $configfile)) {  #    - Is the keyword recognized.
  return "refused\n";  #    - Is the proper client type attempting the request.
     }  #    - Is the request encrypted if it has to be.
     my $editor = ConfigFileEdit->new($configfile);  #   Parameters:
   #    $request_name         - Name of the request being registered.
   #                           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
   #    $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 $RequestName
   #      - On failure, the program will die as it's a bad internal bug to try to 
   #        register a duplicate command handler.
   #
   sub register_handler {
       my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok)   = @_;
   
     for (my $i = 0; $i < $linecount; $i++) {      #  Don't allow duplication#
  ApplyEdit($scriptlines[$i], $editor);     
       if (defined $Dispatcher{$request_name}) {
    die "Attempting to define a duplicate request handler for $request_name\n";
     }      }
     # If the file is the host file, ensure that our host is      #   Build the client type mask:
     # adjusted to have our ip:      
     #      my $client_type_mask = 0;
     if($filetype eq "host") {      if($client_ok) {
  AdjustOurHost($editor);   $client_type_mask  |= $CLIENT_OK;
     }      }
     #  Finally replace the current file with our file.      if($manager_ok) {
     #   $client_type_mask  |= $MANAGER_OK;
     ReplaceConfigFile($configfile, $editor);      }
      
     return "ok\n";      #  Enter the hash:
         
       my @entry = ($procedure, $must_encode, $client_type_mask);
      
       $Dispatcher{$request_name} = \@entry;
      
 }  }
   
   
   #------------------------------------------------------------------
   
   
   
   
 #  #
 #  Convert an error return code from lcpasswd to a string value.  #  Convert an error return code from lcpasswd to a string value.
 #  #
Line 3264  sub catchexception { Line 4751  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 $thisserver died through "
      ."a crash with this error msg->[$error]</font>");       ."a crash with this error msg->[$error]</font>");
     &logthis('Famous last words: '.$status.' - '.$lastlog);      &logthis('Famous last words: '.$status.' - '.$lastlog);
Line 3272  sub catchexception { Line 4759  sub catchexception {
     $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 3327  $server = IO::Socket::INET->new(LocalPor Line 4814  $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{$pid});
    }
     }      }
     &status("Finished Handling child death");      &status("Finished Handling child death");
 }  }
Line 3350  sub HUNTSMAN {                      # si Line 4845  sub HUNTSMAN {                      # si
     &logthis("Free socket: ".shutdown($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 3360  sub HUPSMAN {                      # sig Line 4855  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 3370  sub HUPSMAN {                      # sig Line 4865  sub HUPSMAN {                      # sig
 #  #
 #    Kill off hashes that describe the host table prior to re-reading it.  #    Kill off hashes that describe the host table prior to re-reading it.
 #    Hashes affected are:  #    Hashes affected are:
 #       %hostid, %hostdom %hostip  #       %hostid, %hostdom %hostip %hostdns.
 #  #
 sub KillHostHashes {  sub KillHostHashes {
     foreach my $key (keys %hostid) {      foreach my $key (keys %hostid) {
Line 3382  sub KillHostHashes { Line 4877  sub KillHostHashes {
     foreach my $key (keys %hostip) {      foreach my $key (keys %hostip) {
  delete $hostip{$key};   delete $hostip{$key};
     }      }
       foreach my $key (keys %hostdns) {
    delete $hostdns{$key};
       }
 }  }
 #  #
 #   Read in the host table from file and distribute it into the various hashes:  #   Read in the host table from file and distribute it into the various hashes:
Line 3392  sub KillHostHashes { Line 4890  sub KillHostHashes {
 sub ReadHostTable {  sub ReadHostTable {
   
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";      open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
           my $myloncapaname = $perlvar{'lonHostID'};
       Debug("My loncapa name is : $myloncapaname");
       my %name_to_ip;
     while (my $configline=<CONFIG>) {      while (my $configline=<CONFIG>) {
  my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);   if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
  chomp($ip); $ip=~s/\D+$//;      my ($id,$domain,$role,$name)=split(/:/,$configline);
  $hostid{$ip}=$id;      $name=~s/\s//g;
  $hostdom{$id}=$domain;      my $ip;
  $hostip{$id}=$ip;      if (!exists($name_to_ip{$name})) {
  if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }   $ip = gethostbyname($name);
    if (!$ip || length($ip) ne 4) {
       &logthis("Skipping host $id name $name no IP found\n");
       next;
    }
    $ip=inet_ntoa($ip);
    $name_to_ip{$name} = $ip;
       } else {
    $ip = $name_to_ip{$name};
       }
       $hostid{$ip}=$id;         # LonCAPA name of host by IP.
       $hostdom{$id}=$domain;    # LonCAPA domain name of host. 
       $hostname{$id}=$name;     # LonCAPA name -> DNS name
       $hostip{$id}=$ip;         # IP address of host.
       $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
   
       if ($id eq $perlvar{'lonHostID'}) { 
    Debug("Found me in the host table: $name");
    $thisserver=$name; 
       }
    }
     }      }
     close(CONFIG);      close(CONFIG);
 }  }
Line 3461  sub checkchildren { Line 4981  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 3482  sub checkchildren { Line 5004  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 3489  sub checkchildren { Line 5012  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 3519  sub Debug { Line 5043  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;  
     my $reply   = shift;  
     my $request = shift;  
   
     print $fd $reply;      print $fd $reply;
     Debug("Request was $request  Reply was $reply");      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 3551  sub Reply { Line 5068  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 3598  sub status { Line 5116  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  # ----------------------------------------------------------- Send USR1 to lonc
Line 3635  sub reconlonc { Line 5134  sub reconlonc {
             kill USR1 => $loncpid;              kill USR1 => $loncpid;
         } else {          } else {
     &logthis(      &logthis(
               "<font color=red>CRITICAL: "                "<font color='red'>CRITICAL: "
              ."lonc at pid $loncpid not responding, giving up</font>");               ."lonc at pid $loncpid not responding, giving up</font>");
         }          }
     } else {      } else {
       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');        &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
     }      }
 }  }
   
Line 3647  sub reconlonc { Line 5146  sub reconlonc {
   
 sub subreply {  sub subreply {
     my ($cmd,$server)=@_;      my ($cmd,$server)=@_;
     my $peerfile="$perlvar{'lonSockDir'}/$server";      my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
        or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "sethost:$server:$cmd\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
     if (!$answer) { $answer="con_lost"; }      if (!$answer) { $answer="con_lost"; }
Line 3668  sub reply { Line 5167  sub reply {
  $answer=subreply("ping",$server);   $answer=subreply("ping",$server);
         if ($answer ne $server) {          if ($answer ne $server) {
     &logthis("sub reply: answer != server answer is $answer, server is $server");      &logthis("sub reply: answer != server answer is $answer, server is $server");
            &reconlonc("$perlvar{'lonSockDir'}/$server");             &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});
         }          }
         $answer=subreply($cmd,$server);          $answer=subreply($cmd,$server);
     }      }
Line 3680  sub reply { Line 5179  sub reply {
   
 # -------------------------------------------------------------- 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 3695  sub subsqlreply { Line 5194  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 3743  my $execdir=$perlvar{'lonDaemons'}; Line 5230  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 3761  $SIG{USR2} = \&UpdateHosts; Line 5248  $SIG{USR2} = \&UpdateHosts;
   
 ReadHostTable;  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 3777  while (1) { Line 5265  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 3798  sub make_new_child { Line 5287  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 3823  sub make_new_child { Line 5322  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 'fedora4') || ($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!!   ReadManagerTable; # May also be a manager!!
   
  my $clientrec=($hostid{$clientip}     ne undef);   my $outsideip=$clientip;
  my $ismanager=($managers{$clientip}    ne undef);   if ($clientip eq '127.0.0.1') {
       $outsideip=$hostip{$perlvar{'lonHostID'}};
    }
   
    my $clientrec=($hostid{$outsideip}     ne undef);
    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 = $hostid{$outsideip};
     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 $clientname");
     &logthis('<font color="yellow">INFO: Connection, '.      &logthis('<font color="yellow">INFO: Connection, '.
Line 3857  sub make_new_child { Line 5364  sub make_new_child {
   " ($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
           
Line 3894  sub make_new_child { Line 5461  sub make_new_child {
     # no need to try to do recon's to myself      # no need to try to do recon's to myself
     next;      next;
  }   }
  &reconlonc("$perlvar{'lonSockDir'}/$id");   &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$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 3930  sub make_new_child { Line 5497  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($value);
   }
 #  #
 #   Checks to see if the input roleput request was to set  #   Checks to see if the input roleput request was to set
 # an author role.  If so, invokes the lchtmldir script to set  # an author role.  If so, invokes the lchtmldir script to set
Line 3943  sub make_new_child { Line 5540  sub make_new_child {
 #    user      - Name of the user for which the role is being put.  #    user      - Name of the user for which the role is being put.
 #    authtype  - The authentication type associated with the user.  #    authtype  - The authentication type associated with the user.
 #  #
 sub ManagePermissions  sub manage_permissions {
 {      my ($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.
   #
   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;
       }
   
   }
   
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  #   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 3979  sub GetAuthType Line 5641  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) = @_;
   
   
       # 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 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();
    $credentials->initialize($krbclient);
    my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
    $krbserver,
    $password,
    $credentials);
    $validated = ($krbreturn == 1);
       } else {
    $validated = 0;
       }
    } elsif ($howpwd eq "localauth") { 
       #  Authenticate via installation specific authentcation method:
       $validated = &localauth::localauth($user, 
          $password, 
          $contentpwd);
    } 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;
Line 4012  sub addline { Line 5793  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 4055  sub chatadd { Line 5848  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 4139  sub thisversion { Line 5952  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 4183  sub subscribe { Line 5996  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,$passfilename)=@_;
Line 4190  sub make_passwd_file { Line 6032  sub make_passwd_file {
     if ($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 4199  sub make_passwd_file { Line 6045  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 4216  sub make_passwd_file { Line 6082  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\n";
    }  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\n";
Line 4235  sub make_passwd_file { Line 6125  sub make_passwd_file {
     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 ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
  $currenthostid=$hostid;   $currenthostid  =$hostid;
  $currentdomainid=$hostdom{$hostid};   $currentdomainid=$hostdom{$hostid};
  &logthis("Setting hostid to $hostid, and domain to $currentdomainid");   &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {      } else {
Line 4256  sub version { Line 6156  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  #There is a copy of this in lonnet.pm
 #   Can we hoist these lil' things out into common places?  
 #  
 sub userload {  sub userload {
     my $numusers=0;      my $numusers=0;
     {      {
Line 4282  sub userload { Line 6180  sub userload {
     return $userloadpercent;      return $userloadpercent;
 }  }
   
   # Routines for serializing arrays and hashes (copies from lonnet)
   
   sub array2str {
     my (@array) = @_;
     my $result=&arrayref2str(\@array);
     $result=~s/^__ARRAY_REF__//;
     $result=~s/__END_ARRAY_REF__$//;
     return $result;
   }
                                                                                    
   sub arrayref2str {
     my ($arrayref) = @_;
     my $result='__ARRAY_REF__';
     foreach my $elem (@$arrayref) {
       if(ref($elem) eq 'ARRAY') {
         $result.=&arrayref2str($elem).'&';
       } elsif(ref($elem) eq 'HASH') {
         $result.=&hashref2str($elem).'&';
       } elsif(ref($elem)) {
         #print("Got a ref of ".(ref($elem))." skipping.");
       } else {
         $result.=&escape($elem).'&';
       }
     }
     $result=~s/\&$//;
     $result .= '__END_ARRAY_REF__';
     return $result;
   }
                                                                                    
   sub hash2str {
     my (%hash) = @_;
     my $result=&hashref2str(\%hash);
     $result=~s/^__HASH_REF__//;
     $result=~s/__END_HASH_REF__$//;
     return $result;
   }
                                                                                    
   sub hashref2str {
     my ($hashref)=@_;
     my $result='__HASH_REF__';
     foreach (sort(keys(%$hashref))) {
       if (ref($_) eq 'ARRAY') {
         $result.=&arrayref2str($_).'=';
       } elsif (ref($_) eq 'HASH') {
         $result.=&hashref2str($_).'=';
       } elsif (ref($_)) {
         $result.='=';
         #print("Got a ref of ".(ref($_))." skipping.");
       } else {
           if ($_) {$result.=&escape($_).'=';} else { last; }
       }
   
       if(ref($hashref->{$_}) eq 'ARRAY') {
         $result.=&arrayref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_}) eq 'HASH') {
         $result.=&hashref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_})) {
          $result.='&';
         #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
       } else {
         $result.=&escape($hashref->{$_}).'&';
       }
     }
     $result=~s/\&$//;
     $result .= '__END_HASH_REF__';
     return $result;
   }
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  # ----------------------------------- POD (plain old documentation, CPAN style)
   
 =head1 NAME  =head1 NAME
Line 4489  Place in B<logs/lond.log> Line 6455  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 4597  to the client, and the connection is clo Line 6563  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()
Removed from v.1.178.2.2  
changed lines
  Added in v.1.344

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