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Diff for /loncom/lond between versions 1.178.2.8 and 1.381

version 1.178.2.8, 2004/03/16 10:52:30 version 1.381, 2007/09/12 20:29:13
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 Apache::lonnet;
   
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
 #use Apache::File;  #use Apache::File;
 use Symbol;  
 use POSIX;  use POSIX;
 use Crypt::IDEA;  use Crypt::IDEA;
 use LWP::UserAgent();  use LWP::UserAgent();
   use Digest::MD5 qw(md5_hex);
 use GDBM_File;  use GDBM_File;
 use Authen::Krb4;  use Authen::Krb4;
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  
 use localauth;  use localauth;
   use localenroll;
   use localstudentphoto;
 use File::Copy;  use File::Copy;
 use LONCAPA::ConfigFileEdit;  use File::Find;
   use LONCAPA::lonlocal;
   use LONCAPA::lonssl;
   use Fcntl qw(:flock);
   
 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 $keymode;
   
   my $cipher; # Cipher key negotiated with client
   my $tmpsnum = 0; # Id of tmpputs.
   
 #   # 
 #   Connection type is:  #   Connection type is:
Line 77  my $thisserver; Line 84  my $thisserver;
   
 my $ConnectionType;  my $ConnectionType;
   
 my %hostid;  
 my %hostdom;  
 my %hostip;  
   
 my %managers; # Ip -> manager names  my %managers; # Ip -> manager names
   
 my %perlvar; # Will have the apache conf defined perl vars.  my %perlvar; # Will have the apache conf defined perl vars.
Line 98  my $CLIENT_OK  = 1; Line 101  my $CLIENT_OK  = 1;
 my $MANAGER_OK = 2;  my $MANAGER_OK = 2;
 my %Dispatcher;  my %Dispatcher;
   
   
 #  #
 #  The array below are password error strings."  #  The array below are password error strings."
 #  #
 my $lastpwderror    = 13; # Largest error number from lcpasswd.  my $lastpwderror    = 13; # Largest error number from lcpasswd.
 my @passwderrors = ("ok",  my @passwderrors = ("ok",
    "lcpasswd must be run as user 'www'",     "pwchange_failure - lcpasswd must be run as user 'www'",
    "lcpasswd got incorrect number of arguments",     "pwchange_failure - lcpasswd got incorrect number of arguments",
    "lcpasswd did not get the right nubmer of input text lines",     "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
    "lcpasswd too many simultaneous pwd changes in progress",     "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
    "lcpasswd User does not exist.",     "pwchange_failure - lcpasswd User does not exist.",
    "lcpasswd Incorrect current passwd",     "pwchange_failure - lcpasswd Incorrect current passwd",
    "lcpasswd Unable to su to root.",     "pwchange_failure - lcpasswd Unable to su to root.",
    "lcpasswd Cannot set new passwd.",     "pwchange_failure - lcpasswd Cannot set new passwd.",
    "lcpasswd Username has invalid characters",     "pwchange_failure - lcpasswd Username has invalid characters",
    "lcpasswd Invalid characters in password",     "pwchange_failure - lcpasswd Invalid characters in password",
     "11", "12",     "pwchange_failure - lcpasswd User already exists", 
     "lcpasswd Password mismatch");                     "pwchange_failure - lcpasswd Something went wrong with user addition.",
      "pwchange_failure - lcpasswd Password mismatch",
      "pwchange_failure - lcpasswd Error filename is invalid");
   
   
 #  The array below are lcuseradd error strings.:  #  The array below are lcuseradd error strings.:
Line 129  my @adderrors    = ("ok", Line 135  my @adderrors    = ("ok",
     "lcuseradd Unable to make www member of users's group",      "lcuseradd Unable to make www member of users's group",
     "lcuseradd Unable to su to root",      "lcuseradd Unable to su to root",
     "lcuseradd Unable to set password",      "lcuseradd Unable to set password",
     "lcuseradd Usrname has invalid characters",      "lcuseradd Username has invalid characters",
     "lcuseradd Password has an invalid character",      "lcuseradd Password has an invalid character",
     "lcuseradd User already exists",      "lcuseradd User already exists",
     "lcuseradd Could not add user.",      "lcuseradd Could not add user.",
     "lcuseradd Password mismatch");      "lcuseradd Password mismatch");
   
   
   
 #  #
 #   Statistics that are maintained and dislayed in the status line.  #   Statistics that are maintained and dislayed in the status line.
 #  #
 my $Transactions; # Number of attempted transactions.  my $Transactions = 0; # Number of attempted transactions.
 my $Failures; # Number of transcations failed.  my $Failures     = 0; # Number of transcations failed.
   
 #   ResetStatistics:   #   ResetStatistics: 
 #      Resets the statistics counters:  #      Resets the statistics counters:
Line 149  sub ResetStatistics { Line 157  sub ResetStatistics {
     $Failures     = 0;      $Failures     = 0;
 }  }
   
   #------------------------------------------------------------------------
   #
   #   LocalConnection
   #     Completes the formation of a locally authenticated connection.
   #     This function will ensure that the 'remote' client is really the
   #     local host.  If not, the connection is closed, and the function fails.
   #     If so, initcmd is parsed for the name of a file containing the
   #     IDEA session key.  The fie is opened, read, deleted and the session
   #     key returned to the caller.
   #
   # Parameters:
   #   $Socket      - Socket open on client.
   #   $initcmd     - The full text of the init command.
   #
   # Returns:
   #     IDEA session key on success.
   #     undef on failure.
   #
   sub LocalConnection {
       my ($Socket, $initcmd) = @_;
       Debug("Attempting local connection: $initcmd client: $clientip");
       if($clientip ne "127.0.0.1") {
    &logthis('<font color="red"> LocalConnection rejecting non local: '
    ."$clientip ne 127.0.0.1 </font>");
    close $Socket;
    return undef;
       }  else {
    chomp($initcmd); # Get rid of \n in filename.
    my ($init, $type, $name) = split(/:/, $initcmd);
    Debug(" Init command: $init $type $name ");
   
    # Require that $init = init, and $type = local:  Otherwise
    # the caller is insane:
   
    if(($init ne "init") && ($type ne "local")) {
       &logthis('<font color = "red"> LocalConnection: caller is insane! '
        ."init = $init, and type = $type </font>");
       close($Socket);;
       return undef;
   
    }
    #  Now get the key filename:
   
    my $IDEAKey = lonlocal::ReadKeyFile($name);
    return $IDEAKey;
       }
   }
   #------------------------------------------------------------------------------
   #
   #  SSLConnection
   #   Completes the formation of an ssh authenticated connection. The
   #   socket is promoted to an ssl socket.  If this promotion and the associated
   #   certificate exchange are successful, the IDEA key is generated and sent
   #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
   #   the caller after the SSL tunnel is torn down.
   #
   # Parameters:
   #   Name              Type             Purpose
   #   $Socket          IO::Socket::INET  Plaintext socket.
   #
   # Returns:
   #    IDEA key on success.
   #    undef on failure.
   #
   sub SSLConnection {
       my $Socket   = shift;
   
       Debug("SSLConnection: ");
       my $KeyFile         = lonssl::KeyFile();
       if(!$KeyFile) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get key file $err </font>");
    return undef;
       }
       my ($CACertificate,
    $Certificate) = lonssl::CertificateFile();
   
   
       # If any of the key, certificate or certificate authority 
       # certificate filenames are not defined, this can't work.
   
       if((!$Certificate) || (!$CACertificate)) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get certificates: $err </font>");
   
    return undef;
       }
       Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
   
       # Indicate to our peer that we can procede with
       # a transition to ssl authentication:
   
       print $Socket "ok:ssl\n";
   
       Debug("Approving promotion -> ssl");
       #  And do so:
   
       my $SSLSocket = lonssl::PromoteServerSocket($Socket,
    $CACertificate,
    $Certificate,
    $KeyFile);
       if(! ($SSLSocket) ) { # SSL socket promotion failed.
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL "
    ."SSL Socket promotion failed: $err </font>");
    return undef;
       }
       Debug("SSL Promotion successful");
   
       # 
       #  The only thing we'll use the socket for is to send the IDEA key
       #  to the peer:
   
       my $Key = lonlocal::CreateCipherKey();
       print $SSLSocket "$Key\n";
   
       lonssl::Close($SSLSocket); 
   
       Debug("Key exchange complete: $Key");
   
       return $Key;
   }
   #
   #     InsecureConnection: 
   #        If insecure connections are allowd,
   #        exchange a challenge with the client to 'validate' the
   #        client (not really, but that's the protocol):
   #        We produce a challenge string that's sent to the client.
   #        The client must then echo the challenge verbatim to us.
   #
   #  Parameter:
   #      Socket      - Socket open on the client.
   #  Returns:
   #      1           - success.
   #      0           - failure (e.g.mismatch or insecure not allowed).
   #
   sub InsecureConnection {
       my $Socket  =  shift;
   
       #   Don't even start if insecure connections are not allowed.
   
       if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
    return 0;
       }
   
       #   Fabricate a challenge string and send it..
   
       my $challenge = "$$".time; # pid + time.
       print $Socket "$challenge\n";
       &status("Waiting for challenge reply");
   
       my $answer = <$Socket>;
       $answer    =~s/\W//g;
       if($challenge eq $answer) {
    return 1;
       } else {
    logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
    &status("No challenge reqply");
    return 0;
       }
       
   
   }
   #
   #   Safely execute a command (as long as it's not a shel command and doesn
   #   not require/rely on shell escapes.   The function operates by doing a
   #   a pipe based fork and capturing stdout and stderr  from the pipe.
   #
   # Formal Parameters:
   #     $line                    - A line of text to be executed as a command.
   # Returns:
   #     The output from that command.  If the output is multiline the caller
   #     must know how to split up the output.
   #
   #
   sub execute_command {
       my ($line)    = @_;
       my @words     = split(/\s/, $line); # Bust the command up into words.
       my $output    = "";
   
       my $pid = open(CHILD, "-|");
       
       if($pid) { # Parent process
    Debug("In parent process for execute_command");
    my @data = <CHILD>; # Read the child's outupt...
    close CHILD;
    foreach my $output_line (@data) {
       Debug("Adding $output_line");
       $output .= $output_line; # Presumably has a \n on it.
    }
   
       } else { # Child process
    close (STDERR);
    open  (STDERR, ">&STDOUT");# Combine stderr, and stdout...
    exec(@words); # won't return.
       }
       return $output;
   }
   
   
   #   GetCertificate: Given a transaction that requires a certificate,
   #   this function will extract the certificate from the transaction
   #   request.  Note that at this point, the only concept of a certificate
   #   is the hostname to which we are connected.
   #
   #   Parameter:
   #      request   - The request sent by our client (this parameterization may
   #                  need to change when we really use a certificate granting
   #                  authority.
   #
   sub GetCertificate {
       my $request = shift;
   
       return $clientip;
   }
   
 #  #
 #   Return true if client is a manager.  #   Return true if client is a manager.
 #  #
Line 161  sub isManager { Line 387  sub isManager {
 sub isClient {  sub isClient {
     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));      return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
 }  }
   
   
 #  #
 #   Ties a resource file to a hash.  If necessary, an appropriate history  #   ReadManagerTable: Reads in the current manager table. For now this is
 #   log file entry is made as well.  #                     done on each manager authentication because:
 #   This sub factors out common code from the subs that manipulate  #                     - These authentications are not frequent
 #   the various gdbm files that keep keyword value pairs.  #                     - This allows dynamic changes to the manager table
 # Parameters:  #                       without the need to signal to the lond.
 #   domain       - Name of the domain the user is in.  #
 #   user         - Name of the 'current user'.  sub ReadManagerTable {
 #   namespace    - Namespace representing the file to tie.  
 #   how          - What the tie is done to (e.g. GDBM_WRCREAT().      #   Clean out the old table first..
 #   loghead      - Optional first part of log entry if there may be a  
 #                  history file.     foreach my $key (keys %managers) {
 #   what         - Optional tail of log entry if there may be a history        delete $managers{$key};
 #                  file.     }
 # Returns:  
 #   hash to which the database is tied.  It's up to the caller to untie.     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
 #   undef if the has could not be tied.     if (!open (MANAGERS, $tablename)) {
 #        logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
 sub TieResourceHash {        return;
   my $domain      = shift;     }
   my $user        = shift;     while(my $host = <MANAGERS>) {
   my $namespace   = shift;        chomp($host);
   my $how         = shift;        if ($host =~ "^#") {                  # Comment line.
            next;
   $namespace=~s/\//\_/g; # / -> _        }
   $namespace=~s/\W//g; # whitespace eliminated.        if (!defined &Apache::lonnet::get_host_ip($host)) { # This is a non cluster member
   my $proname     = propath($domain, $user);      #  The entry is of the form:
       #    cluname:hostname
   # If this is a namespace for which a history is kept,      #  cluname - A 'cluster hostname' is needed in order to negotiate
   # make the history log entry:      #            the host key.
       #  hostname- The dns name of the host.
       #
   unless ($namespace =~/^nohist\_/ && (scalar @_ > 0)) {            my($cluname, $dnsname) = split(/:/, $host);
     my $hfh = IO::File->new(">>$proname/$namespace.hist");             
     if($hfh) {            my $ip = gethostbyname($dnsname);
       my $now = time;            if(defined($ip)) {                 # bad names don't deserve entry.
       my $loghead  = shift;              my $hostip = inet_ntoa($ip);
       my $what    = shift;              $managers{$hostip} = $cluname;
       print $hfh "$loghead:$now:$what\n";              logthis('<font color="green"> registering manager '.
     }                      "$dnsname as $cluname with $hostip </font>\n");
   }           }
   #  Tie the database.        } else {
            logthis('<font color="green"> existing host'." $host</font>\n");
   my %hash;           $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
   if(tie(%hash, 'GDBM_FILE', "$proname/$namespace.db",        }
  $how, 0640)) {     }
     return \%hash;  
   }  
   else {  
     return undef;  
   }  
     
 }  }
   
 #  #
 #   Get a Request:  #  ValidManager: Determines if a given certificate represents a valid manager.
 #   Gets a Request message from the client.  The transaction  #                in this primitive implementation, the 'certificate' is
 #   is defined as a 'line' of text.  We remove the new line  #                just the connecting loncapa client name.  This is checked
 #   from the text line.    #                against a valid client list in the configuration.
 #     #
 sub GetRequest {  #                  
     my $input = <$client>;  sub ValidManager {
     chomp($input);      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 {
   
     Debug("Request = $input\n");      my ($oldfile, $newfile) = @_;
   
     &status('Processing '.$clientname.':'.$input);      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'};
   
     return $input;      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;
 }  }
 #  #
 #   Decipher encoded traffic  #   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.
   #
 #  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, $encidx, 16)));  
  }  
  return substr($output, 0, $enclength);  
     } else {      } else {
  return undef;   return undef;
     }      }
       return $tablefile;
   
   }
   #
   #   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:
   
       my ($command, $key, $newline)  = split(/\|/, $scriptline);
       &logthis('<font color="green"> isValideditCommand checking: '.
        "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
       
       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 {
       return 0;
    }
       } else {
    return 0; # Invalid command.
     }      }
     #   Build the client type mask:      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);
           
     my $ClientTypeMask = 0;  }
     if($ClientOk) {  #
  $ClientTypeMask  |= $CLIENT_OK;  #   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: $filetype \n";
     }      }
     if($ManagerOk) {  
  $ClientTypeMask  |= $MANAGER_OK;      #   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";
    }
     }      }
      
     #  Enter the hash:      #   Execute the edit operation.
             #   - Create a config file editor for the appropriate file and 
     my @entry = ($Procedure, $MustEncode, $ClientTypeMask);      #   - execute each command in the script:
          #
     $Dispatcher{$RequestName} = \@entry;      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.  #      $cmd    - the actual keyword that invoked us.
Line 333  sub RegisterHandler { Line 992  sub RegisterHandler {
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   sub ping_handler {
 sub PingHandler {      my ($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.  #      $tail   - the tail of the request that invoked us.
Line 358  RegisterHandler("ping", \&PingHandler, 0 Line 1019  RegisterHandler("ping", \&PingHandler, 0
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   sub pong_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
 sub PongHandler {      my $reply=&Apache::lonnet::reply("ping",$clientname);
     my $cmd     = shift;      &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
     my $tail    = shift;  
     my $replyfd = shift;  
   
     my $reply=&reply("ping",$clientname);  
     Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");   
     return 1;      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 389  RegisterHandler("pong", \&PongHandler, 0 Line 1052  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.$$.int(rand 100000);      my $buildkey=time.$$.int(rand 100000);
     $buildkey=~tr/1-6/A-F/;      $buildkey=~tr/1-6/A-F/;
Line 405  sub EstablishKeyHandler { Line 1066  sub EstablishKeyHandler {
     $key=substr($key,0,32);      $key=substr($key,0,32);
     my $cipherkey=pack("H32",$key);      my $cipherkey=pack("H32",$key);
     $cipher=new IDEA $cipherkey;      $cipher=new IDEA $cipherkey;
     Reply($replyfd, "$buildkey\n", "$cmd:$tail");       &Reply($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 429  RegisterHandler("ekey", \&EstablishKeyHa Line 1089  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
Line 445  sub LoadHandler { Line 1103  sub LoadHandler {
         
     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 472  RegisterHandler("load", \&LoadHandler, 0 Line 1129  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 $userloadpercent=&Apache::lonnet::userload();
     Reply($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 497  RegisterHandler("userload", \&UserLoadHa Line 1152  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", $userinput);
     } else {      } else {
  #   #
  # We only want to pass the second field from GetAuthType   # We only want to pass the second field from get_auth_type
  # for ^krb.. otherwise we'll be handing out the encrypted   # for ^krb.. otherwise we'll be handing out the encrypted
  # password for internals e.g.   # password for internals e.g.
  #   #
  my ($type,$otherinfo) = split(/:/,$result);   my ($type,$otherinfo) = split(/:/,$result);
  if($type =~ /^krb/) {   if($type =~ /^krb/) {
     $type = $result;      $type = $result;
  }   } else {
  Reply( $replyfd, "$type\n", $userinput);              $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 541  RegisterHandler("currentauth", \&UserAut Line 1196  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 {
 sub PushFileHandler {      my ($cmd, $tail, $client) = @_;
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
   
Line 553  sub PushFileHandler { Line 1205  sub PushFileHandler {
     # the code below is a hook to do further authentication (e.g. to resolve      # the code below is a hook to do further authentication (e.g. to resolve
     # spoofing).      # spoofing).
   
     my $cert = GetCertificate($userinput);      my $cert = &GetCertificate($userinput);
     if(ValidManager($cert)) {       if(&ValidManager($cert)) { 
   
  # Now presumably we have the bona fides of both the peer host and the   # Now presumably we have the bona fides of both the peer host and the
  # process making the request.   # process making the request.
               
  my $reply = PushFile($userinput);   my $reply = &PushFile($userinput);
  Reply($client, "$reply\n", $userinput);   &Reply($client, "$reply\n", $userinput);
   
     } else {      } else {
  Failure( $client, "refused\n", $userinput);   &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;}
       if (-d $_)         { 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;
   
 }  }
 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 584  RegisterHandler("pushfile", \&PushFileHa Line 1421  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 618  RegisterHandler("reinit", \&ReinitProces Line 1452  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 672  RegisterHandler("edit", \&EditTableHandl Line 1503  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       #  Regenerate the full input line 
          
     my $userinput  = $cmd.":".$tail;      my $userinput  = $cmd.":".$tail;
       
     #  udom    - User's domain.      #  udom    - User's domain.
     #  uname   - Username.      #  uname   - Username.
     #  upass   - User's password.      #  upass   - User's password.
          
     my ($udom,$uname,$upass)=split(/:/,$tail);      my ($udom,$uname,$upass)=split(/:/,$tail);
     Debug(" Authenticate domain = $udom, user = $uname, password = $upass");      &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
     chomp($upass);      chomp($upass);
     $upass=unescape($upass);      $upass=&unescape($upass);
   
     # Fetch the user authentication information:      my $pwdcorrect = &validate_user($udom, $uname, $upass);
          if($pwdcorrect) {
     my $realpasswd = GetAuthType($udom, $uname);   &Reply( $client, "authorized\n", $userinput);
     if($realpasswd ne "nouser") { # nouser means no passwd file.  
  my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
  my $pwdcorrect=0;  
  #   #
  #   Authenticate against password stored in the internal file.   #  Bad credentials: Failed to authorize
  #   #
  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') { # Not in shadow file.  
     $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);  
  } elsif (-e $pwauth_path) { # In shadow file so  
     open PWAUTH, "|$pwauth_path" or # use external program  
  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);  
  }  
  #  Used to be unknown_user but that allows crackers to   
  #  distinguish between bad username and bad password so...  
  #    
     } else {      } else {
  Failure( $client, "non_authorized\n", $userinput);   &Failure( $client, "non_authorized\n", $userinput);
     }      }
   
     return 1;      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 815  RegisterHandler("auth", \&AuthenticateHa Line 1555  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.
   
     #      #
Line 827  sub ChangePasswordHandler { Line 1565  sub ChangePasswordHandler {
     #  uname - Username.      #  uname - Username.
     #  upass - Current password.      #  upass - Current password.
     #  npass - New password.      #  npass - New password.
       #  context - Context in which this was called 
       #            (preferences or reset_by_email).
         
     my ($udom,$uname,$upass,$npass)=split(/:/,$tail);      my ($udom,$uname,$upass,$npass,$context)=split(/:/,$tail);
     chomp($npass);  
     $upass=&unescape($upass);      $upass=&unescape($upass);
     $npass=&unescape($npass);      $npass=&unescape($npass);
     &Debug("Trying to change password for $uname");      &Debug("Trying to change password for $uname");
     my $realpasswd  = GetAuthType($udom, $uname);  
     if ($realpasswd ne "nouser") {      # First require that the user can be authenticated with their
       # old password unless context was 'reset_by_email':
       
       my $validated;
       if ($context eq 'reset_by_email') {
           $validated = 1;
       } else {
           $validated = &validate_user($udom, $uname, $upass);
       }
       if($validated) {
    my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
   
  my ($howpwd,$contentpwd)=split(/:/,$realpasswd);   my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
  if ($howpwd eq 'internal') {   if ($howpwd eq 'internal') {
     &Debug("internal auth");      &Debug("internal auth");
     if (crypt($upass,$contentpwd) eq $contentpwd) {      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")) {
  if(RewritePwFile($udom, $uname, "internal:$ncpass")) {   &logthis("Result of password change for "
     &logthis("Result of password change for "   ."$uname: pwchange_success");
      ."$uname: pwchange_success");   &Reply($client, "ok\n", $userinput);
     Reply($client, "ok\n", $userinput);  
  } else {  
     &logthis("Unable to open $uname passwd "                 
      ."to change password");  
     Failure( $client, "non_authorized\n",$userinput);  
  }  
     } else {  
  Failure($client, "non_authorized\n", $userinput);  
     }  
  } elsif ($howpwd eq 'unix') {  
     # Unix means we have to access /etc/password  
     # one way or another.  
     # First: Make sure the current password is  
     #        correct  
     &Debug("auth is unix");  
     $contentpwd=(getpwnam($uname))[1];  
     my $pwdcorrect = "0";  
     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;  
  &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", $userinput);  
     } else {      } else {
  Reply($client, "non_authorized\n", $userinput);   &logthis("Unable to open $uname passwd "               
    ."to change password");
    &Failure( $client, "non_authorized\n",$userinput);
     }      }
    } elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
       my $result = &change_unix_password($uname, $npass);
       &logthis("Result of password change for $uname: ".
        $result);
       &Reply($client, "$result\n", $userinput);
  } else {   } else {
     # this just means that the current password mode is not      # this just means that the current password mode is not
     # one we know how to change (e.g the kerberos auth modes or      # one we know how to change (e.g the kerberos auth modes or
     # locally written auth handler).      # locally written auth handler).
     #      #
     Reply( $client, "auth_mode_error\n", $userinput);      &Failure( $client, "auth_mode_error\n", $userinput);
  }     }  
   
     } else {      } else {
  #  used to be unknonw user but that gives out too much info..   &Failure( $client, "non_authorized\n", $userinput);
  #  so make it the same as if the initial passwd was bad.  
  #  
  Reply( $client, "non_authorized\n", $userinput);  
     }      }
   
     return 1;      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 922  RegisterHandler("passwd", \&ChangePasswo Line 1638  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 $tail    = shift;      my ($cmd, $tail, $client) = @_;
     my $client  = shift;  
   
     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);      my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.      my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
Line 938  sub AddUserHandler { Line 1654  sub AddUserHandler {
  my $oldumask=umask(0077);   my $oldumask=umask(0077);
  chomp($npass);   chomp($npass);
  $npass=&unescape($npass);   $npass=&unescape($npass);
  my $passfilename  = PasswordPath($udom, $uname);   my $passfilename  = &password_path($udom, $uname);
  &Debug("Password file created will be:".$passfilename);   &Debug("Password file created will be:".$passfilename);
  if (-e $passfilename) {   if (-e $passfilename) {
     Failure( $client, "already_exists\n", $userinput);      &Failure( $client, "already_exists\n", $userinput);
  } else {   } else {
     my @fpparts=split(/\//,$passfilename);  
     my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];  
     my $fperror='';      my $fperror='';
     for (my $i=3;$i<= ($#fpparts-1);$i++) {      if (!&mkpath($passfilename)) {
  $fpnow.='/'.$fpparts[$i];    $fperror="error: ".($!+0)." mkdir failed while attempting "
  unless (-e $fpnow) {      ."makeuser";
     unless (mkdir($fpnow,0777)) {  
  $fperror="error: ".($!+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($oldumask);
     }  else {      }  else {
  Failure($client, "not_right_domain\n",   &Failure($client, "not_right_domain\n",
  $userinput); # Even if we are multihomed.   $userinput); # Even if we are multihomed.
           
     }      }
     return 1;      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 994  RegisterHandler("makeuser", \&AddUserHan Line 1703  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);
     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);      &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
     if ($udom ne $currentdomainid) {      if ($udom ne $currentdomainid) {
  Failure( $client, "not_right_domain\n", $client);   &Failure( $client, "not_right_domain\n", $client);
     } else {      } else {
   
  chomp($npass);   chomp($npass);
   
  $npass=&unescape($npass);   $npass=&unescape($npass);
  my $passfilename = PasswordPath($udom, $uname);   my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
    my $passfilename = &password_path($udom, $uname);
  if ($passfilename) { # Not allowed to create a new user!!   if ($passfilename) { # Not allowed to create a new user!!
     my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);      # If just changing the unix passwd. need to arrange to run
     Reply($client, $result, $userinput);      # 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 {          } else {       
     Failure($client, "non_authorized", $userinput); # Fail the user now.      &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
  }   }
     }      }
     return 1;      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 1039  RegisterHandler("changeuserauth", \&Chan Line 1784  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 $passfile = PasswordPath($udom, $uname);      my $passfile = &password_filename($udom, $uname);
     if($passfile) {      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 1079  RegisterHandler("home", \&IsHomeHandler, Line 1823  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);      my $ownership=ishome($fname);
     if ($ownership eq 'not_owner') {      if ($ownership eq 'not_owner') {
  if (-e $fname) {   if (-e $fname) {
Line 1095  sub UpdateResourceHandler { Line 1840  sub UpdateResourceHandler {
     my $now=time;      my $now=time;
     my $since=$now-$atime;      my $since=$now-$atime;
     if ($since>$perlvar{'lonExpire'}) {      if ($since>$perlvar{'lonExpire'}) {
  my $reply=&reply("unsub:$fname","$clientname");   my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
    &devalidate_meta_cache($fname);
  unlink("$fname");   unlink("$fname");
    unlink("$fname.meta");
     } else {      } else {
  my $transname="$fname.in.transfer";   my $transname="$fname.in.transfer";
  my $remoteurl=&reply("sub:$fname","$clientname");   my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
  my $response;   my $response;
  alarm(120);   alarm(120);
  {   {
Line 1126  sub UpdateResourceHandler { Line 1873  sub UpdateResourceHandler {
  alarm(0);   alarm(0);
     }      }
     rename($transname,$fname);      rename($transname,$fname);
       &devalidate_meta_cache($fname);
  }   }
     }      }
     Reply( $client, "ok\n", $userinput);      &Reply( $client, "ok\n", $userinput);
  } else {   } else {
     Failure($client, "not_found\n", $userinput);      &Failure($client, "not_found\n", $userinput);
  }   }
     } else {      } else {
  Failure($client, "rejected\n", $userinput);   &Failure($client, "rejected\n", $userinput);
     }      }
     return 1;      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']});
       $url = &Apache::lonnet::declutter($url);
       $url =~ s-\.meta$--;
       my $id = &escape('meta:'.$url);
       $memcache->delete($id);
   }
   
 #  #
 #   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 1149  RegisterHandler("update", \&UpdateResour Line 1908  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)=split(/\//,$fname);      my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
     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;  
    # IF necessary, create the path right down to the file.
    # Note that any regular files in the way of this path are
    # wiped out to deal with some earlier folly of mine.
   
    if (!&mkpath($udir.'/'.$ufile)) {
       &Failure($client, "unable_to_create\n", $userinput);    
    }
   
  my $destname=$udir.'/'.$ufile;   my $destname=$udir.'/'.$ufile;
  my $transname=$udir.'/'.$ufile.'.in.transit';   my $transname=$udir.'/'.$ufile.'.in.transit';
  my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;   my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
  my $response;   my $response;
    Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
  alarm(120);   alarm(120);
  {   {
     my $ua=new LWP::UserAgent;      my $ua=new LWP::UserAgent;
Line 1179  sub FetchUserFileHandler { Line 1947  sub FetchUserFileHandler {
     unlink($transname);      unlink($transname);
     my $message=$response->status_line;      my $message=$response->status_line;
     &logthis("LWP GET: $message for $fname ($remoteurl)");      &logthis("LWP GET: $message for $fname ($remoteurl)");
     Failure($client, "failed\n", $userinput);      &Failure($client, "failed\n", $userinput);
  } else {   } else {
       Debug("Renaming $transname to $destname");
     if (!rename($transname,$destname)) {      if (!rename($transname,$destname)) {
  &logthis("Unable to move $transname to $destname");   &logthis("Unable to move $transname to $destname");
  unlink($transname);   unlink($transname);
  Failure($client, "failed\n", $userinput);   &Failure($client, "failed\n", $userinput);
     } else {      } else {
  Reply($client, "ok\n", $userinput);   &Reply($client, "ok\n", $userinput);
     }      }
  }      }   
     } else {      } else {
  Failure($client, "not_home\n", $userinput);   &Failure($client, "not_home\n", $userinput);
     }      }
     return 1;      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   #    cmd   - the Lond request keyword that got us here.
 #   access??  #    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|^([^/]+)/([^/]+)/(.+)$|);
       if ($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 $newdir=$udir.'/userfiles/'.$ufile.'/';
       if (!&mkpath($newdir)) {
    &Failure($client, "failed\n", "$cmd:$tail");
       }
       &Reply($client, "ok\n", "$cmd:$tail");
    } else {
       &Failure($client, "not_home\n", "$cmd:$tail");
    }
       }
       return 1;
   }
   &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
   
     my ($fname,$session)=split(/:/,$tail);  #
   #   rename a file in a user's home directory userfiles subdirectory.
   # Parameters:
   #    cmd   - the Lond request keyword that got us here.
   #    tail  - the part of the command past the keyword.
   #    client- File descriptor connected with the client.
   #
   # Returns:
   #    1    - Continue processing.
   sub rename_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($udom,$uname,$old,$new) = split(/:/, $tail);
       $old=&unescape($old);
       $new=&unescape($new);
       if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
    # any files paths with /../ in them refuse to deal with
    &Failure($client, "refused\n", "$cmd:$tail");
       } else {
    my $udir = &propath($udom,$uname);
    if (-e $udir) {
       my $oldfile=$udir.'/userfiles/'.$old;
       my $newfile=$udir.'/userfiles/'.$new;
       if (-e $newfile) {
    &Failure($client, "exists\n", "$cmd:$tail");
       } elsif (! -e $oldfile) {
    &Failure($client, "not_found\n", "$cmd:$tail");
       } else {
    if (!rename($oldfile,$newfile)) {
       &Failure($client, "failed\n", "$cmd:$tail");
    } else {
       &Reply($client, "ok\n", "$cmd:$tail");
    }
       }
    } else {
       &Failure($client, "not_home\n", "$cmd:$tail");
    }
       }
       return 1;
   }
   &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
   
   #
   #  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($session);      chomp($session);
     my $reply='non_auth';      my $reply="non_auth\n";
     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {      my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
  while (my $line=<ENVIN>) {      if (open(ENVIN,"$file")) {
     if ($line=~/userfile\.$fname\=/) {    flock(ENVIN,LOCK_SH);
  $reply='ok';    tie(my %disk_env,'GDBM_File',"$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|) {
       $reply="ok\n";
       last;
    }
     }      }
  }   }
    untie(%disk_env);
  close(ENVIN);   close(ENVIN);
  Reply($client, $reply."\n", $userinput);   &Reply($client, $reply, "$cmd:$tail");
     } else {      } else {
  Failure($client, "invalid_token\n", $userinput);   &Failure($client, "invalid_token\n", "$cmd:$tail");
     }      }
     return 1;      return 1;
      
 }  }
 RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);  &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
   
 #  #
 #   Unsubscribe from a resource.  #   Unsubscribe from a resource.
 #  #
Line 1243  RegisterHandler("tokenauthuserfile", \&A Line 2147  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 = $tail;      my ($fname) = split(/:/,$tail); # Split in case there's extrs.
   
       &Debug("Unsubscribing $fname");
     if (-e $fname) {      if (-e $fname) {
  Reply($client, &unsub($client,$fname,$clientip), $userinput);   &Debug("Exists");
    &Reply($client, &unsub($fname,$clientip), $userinput);
     } else {      } else {
  Failure($client, "not_found\n", $userinput);   &Failure($client, "not_found\n", $userinput);
     }      }
     return 1;      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 1269  RegisterHandler("unusb", \&UnsubscribeHa Line 2175  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";      my $userinput  = "$cmd:$tail";
   
     Reply( $client, &subscribe($userinput,$clientip), $userinput);      &Reply( $client, &subscribe($userinput,$clientip), $userinput);
   
     return 1;      return 1;
 }  }
 RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);  &register_handler("sub", \&subscribe_handler, 0, 1, 0);
   
 #  #
 #   Determine the version of a resource (?) Or is it return  #   Determine the latest version of a resource (it looks for the highest
 #   the top version of the resource?  Not yet clear from the  #   past version and then returns that +1)
 #   code in currentversion.  
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
 #    $tail     - Tail of the command (remaining parameters).  #    $tail     - Tail of the command (remaining parameters).
   #                 (Should consist of an absolute path to a file)
 #    $client   - File descriptor connected to client.  #    $client   - File descriptor connected to client.
 # Returns  # Returns
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub CurrentVersionHandler {  sub current_version_handler {
     my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";      my $userinput= "$cmd:$tail";
         
     my $fname   = $tail;      my $fname   = $tail;
     Reply( $client, &currentversion($fname)."\n", $userinput);      &Reply( $client, &currentversion($fname)."\n", $userinput);
     return 1;      return 1;
   
 }  }
 RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);  &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
   
   
 #  Make an entry in a user's activity log.  #  Make an entry in a user's activity log.
 #  #
Line 1318  RegisterHandler("currentversion", \&Curr Line 2221  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 $userinput= "$cmd:$tail";
   
     my ($udom,$uname,$what)=split(/:/,$tail);      my ($udom,$uname,$what)=split(/:/,$tail);
     chomp($what);      chomp($what);
     my $proname=propath($udom,$uname);      my $proname=&propath($udom,$uname);
     my $now=time;      my $now=time;
     my $hfh;      my $hfh;
     if ($hfh=IO::File->new(">>$proname/activity.log")) {       if ($hfh=IO::File->new(">>$proname/activity.log")) { 
  print $hfh "$now:$clientname:$what\n";   print $hfh "$now:$clientname:$what\n";
  Reply( $client, "ok\n", $userinput);    &Reply( $client, "ok\n", $userinput); 
     } else {      } else {
  Failure($client, "error: ".($!+0)." IO::File->new Failed "   &Failure($client, "error: ".($!+0)." IO::File->new Failed "
       ."while attempting log\n",    ."while attempting log\n", 
       $userinput);   $userinput);
     }      }
   
     return 1;      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 1355  RegisterHandler("log", \&ActivityLogEntr Line 2259  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 ($udom,$uname,$namespace,$what) =split(/:/,$tail);      my $userinput = "$cmd:$tail";
       
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
     if ($namespace ne 'roles') {      if ($namespace ne 'roles') {
        chomp($what);   chomp($what);
        my $hashref = TieResourceHash($udom, $uname, $namespace,   my $hashref = &tie_user_hash($udom, $uname, $namespace,
      &GDBM_WRCREAT(),"P",$what);    &GDBM_WRCREAT(),"P",$what);
        if($hashref) {   if($hashref) {
  my @pairs=split(/\&/,$what);      my @pairs=split(/\&/,$what);
  foreach my $pair (@pairs) {      foreach my $pair (@pairs) {
     my ($key,$value)=split(/=/,$pair);   my ($key,$value)=split(/=/,$pair);
     $hashref->{$key}=$value;   $hashref->{$key}=$value;
   }      }
   if (untie(%$hashref)) {      if (&untie_user_hash($hashref)) {
      Reply( $client, "ok\n", $userinput);   &Reply( $client, "ok\n", $userinput);
   } else {      } else {
      Failure($client, "error: ".($!+0)." untie(GDBM) failed ".   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
      "while attempting put\n",    "while attempting put\n", 
      $userinput);   $userinput);
   }      }
        } else {   } else {
   Failure( $client, "error: ".($!)." tie(GDBM) Failed ".      &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting put\n", $userinput);       "while attempting put\n", $userinput);
        }   }
      } else {      } else {
         Failure( $client, "refused\n", $userinput);          &Failure( $client, "refused\n", $userinput);
      }      }
           
      return 1;      return 1;
   }
   &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;
 }  }
 RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);  &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
   
 #   # 
 #   Increment a profile entry in the user history file.  #   Increment a profile entry in the user history file.
Line 1406  RegisterHandler("put", \&PutUserProfileE Line 2364  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 $userinput   = "$cmd:$tail";
       
     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);      my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
     if ($namespace ne 'roles') {      if ($namespace ne 'roles') {
         chomp($what);          chomp($what);
  my $hashref = TieResourceHash($udom, $uname,   my $hashref = &tie_user_hash($udom, $uname,
       $namespace, &GDBM_WRCREAT(),       $namespace, &GDBM_WRCREAT(),
       "P",$what);       "P",$what);
  if ($hashref) {   if ($hashref) {
    my @pairs=split(/\&/,$what);      my @pairs=split(/\&/,$what);
    foreach my $pair (@pairs) {      foreach my $pair (@pairs) {
      my ($key,$value)=split(/=/,$pair);   my ($key,$value)=split(/=/,$pair);
      # We could check that we have a number...                  $value = &unescape($value);
      if (! defined($value) || $value eq '') {   # We could check that we have a number...
         $value = 1;   if (! defined($value) || $value eq '') {
      }      $value = 1;
      $hashref->{$key}+=$value;   }
    }   $hashref->{$key}+=$value;
    if (untie(%$hashref)) {                  if ($namespace eq 'nohist_resourcetracker') {
       Reply( $client, "ok\n", $userinput);                      if ($hashref->{$key} < 0) {
    } else {                          $hashref->{$key} = 0;
       Failure($client, "error: ".($!+0)." untie(GDBM) failed ".                      }
       "while attempting inc\n", $userinput);                  }
    }      }
  } else {      if (&untie_user_hash($hashref)) {
    Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   &Reply( $client, "ok\n", $userinput);
    "while attempting inc\n", $userinput);      } else {
  }   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
       } else {   "while attempting inc\n", $userinput);
  Failure($client, "refused\n", $userinput);      }
       }   } else {
       &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting inc\n", $userinput);
    }
       } else {
    &Failure($client, "refused\n", $userinput);
       }
           
     return 1;      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 1465  RegisterHandler("inc", \&IncrementUserVa Line 2429  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 $hashref = TieResourceHash($udom, $uname, $namespace,      my $hashref = &tie_user_hash($udom, $uname, $namespace,
   &GDBM_WRCREAT(), "P",   &GDBM_WRCREAT(), "P",
   "$exedom:$exeuser:$what");   "$exedom:$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) {      if ($hashref) {
    my $pass_entry = &get_auth_type($udom, $uname);
    my ($auth_type,$pwd)  = split(/:/, $pass_entry);
    $auth_type = $auth_type.":";
  my @pairs=split(/\&/,$what);   my @pairs=split(/\&/,$what);
  foreach my $pair (@pairs) {   foreach my $pair (@pairs) {
     my ($key,$value)=split(/=/,$pair);      my ($key,$value)=split(/=/,$pair);
     &ManagePermissions($key, $udom, $uname,      &manage_permissions($key, $udom, $uname,
        &GetAuthType( $udom, $uname));         $auth_type);
     $hashref->{$key}=$value;      $hashref->{$key}=$value;
  }   }
  if (untie($hashref)) {   if (&untie_user_hash($hashref)) {
     Reply($client, "ok\n", $userinput);      &Reply($client, "ok\n", $userinput);
  } else {   } else {
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
      "while attempting rolesput\n", $userinput);       "while attempting rolesput\n", $userinput);
  }   }
     } else {      } else {
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting rolesput\n", $userinput);   "while attempting rolesput\n", $userinput);
     }      }
     return 1;      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 1522  RegisterHandler("rolesput", \&RolesPutHa Line 2489  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 $userinput    = "$cmd:$tail";
         
     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);      my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
Line 1533  sub RolesDeleteHandler { Line 2499  sub RolesDeleteHandler {
    "what = ".$what);     "what = ".$what);
     my $namespace='roles';      my $namespace='roles';
     chomp($what);      chomp($what);
     my $hashref = TieResourceHash($udom, $uname, $namespace,      my $hashref = &tie_user_hash($udom, $uname, $namespace,
   &GDBM_WRCREAT(), "D",   &GDBM_WRCREAT(), "D",
   "$exedom:$exeuser:$what");   "$exedom:$exeuser:$what");
       
     if ($hashref) {      if ($hashref) {
        my @rolekeys=split(/\&/,$what);   my @rolekeys=split(/\&/,$what);
          
        foreach my $key (@rolekeys) {   foreach my $key (@rolekeys) {
   delete $hashref->{$key};      delete $hashref->{$key};
        }   }
        if (untie(%$hashref)) {   if (&untie_user_hash($hashref)) {
   Reply($client, "ok\n", $userinput);      &Reply($client, "ok\n", $userinput);
  } else {   } else {
    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
     "while attempting rolesdel\n", $userinput);       "while attempting rolesdel\n", $userinput);
  }   }
      } else {      } else {
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".          &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting rolesdel\n", $userinput);   "while attempting rolesdel\n", $userinput);
      }      }
           
     return 1;      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 1577  RegisterHandler("rolesdel", \&RolesDelet Line 2543  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);
     chomp($what);      chomp($what);
     my $hashref = TieResourceHash($udom, $uname, $namespace,  
  &GDBM_READER());  
     if ($hashref) {  
         my @queries=split(/\&/,$what);  
         my $qresult='';  
   
  for (my $i=0;$i<=$#queries;$i++) {      my $replystring = read_profile($udom, $uname, $namespace, $what);
     $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.      my ($first) = split(/:/,$replystring);
  }      if($first ne "error") {
  $qresult=~s/\&$//;              # Remove trailing & from last lookup.   &Reply($client, "$replystring\n", $userinput);
  if (untie(%$hashref)) {  
     Reply($client, "$qresult\n", $userinput);  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting get\n", $userinput);  
  }  
     } else {      } else {
  if ($!+0 == 2) {               # +0 coerces errno -> number 2 is ENOENT   &Failure($client, $replystring." while attempting get\n", $userinput);
     Failure($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;      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 1632  RegisterHandler("get", \&GetProfileEntry Line 2583  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(/:/,$tail);
     chomp($what);      chomp($what);
     my $hashref = TieResourceHash($udom, $uname, $namespace,      my $qresult = read_profile($udom, $uname, $namespace, $what);
   &GDBM_READER());      my ($first) = split(/:/, $qresult);
     if ($hashref) {      if($first ne "error") {
         my @queries=split(/\&/,$what);  
         my $qresult='';   if ($cipher) {
  for (my $i=0;$i<=$#queries;$i++) {      my $cmdlength=length($qresult);
     $qresult.="$hashref->{$queries[$i]}&";      $qresult.="         ";
  }      my $encqresult='';
  if (untie(%$hashref)) {      for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
     $qresult=~s/\&$//;   $encqresult.= unpack("H16", 
     if ($cipher) {       $cipher->encrypt(substr($qresult,
  my $cmdlength=length($qresult);       $encidx,
  $qresult.="         ";       8)));
  my $encqresult='';  
  for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {  
     $encqresult.= unpack("H16", $cipher->encrypt(substr($qresult,  
  $encidx,  
  8)));  
  }  
  Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);  
     } else {  
  Failure( $client, "error:no_key\n", $userinput);  
     }      }
       &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure( $client, "error:no_key\n", $userinput);
     "while attempting eget\n", $userinput);      }
  }  
     } else {      } else {
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "$qresult while attempting eget\n", $userinput);
  "while attempting eget\n", $userinput);  
     }      }
           
     return 1;      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 1694  RegisterHandler("eget", \&GetProfileEncr Line 2635  RegisterHandler("eget", \&GetProfileEncr
 #     0   - Exit server.  #     0   - Exit server.
 #  #
 #  #
   sub delete_profile_entry {
       my ($cmd, $tail, $client) = @_;
   
 sub DeleteProfileEntry {  
     my $cmd      = shift;  
     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($what);      chomp($what);
     my $hashref = TieResourceHash($udom, $uname, $namespace,      my $hashref = &tie_user_hash($udom, $uname, $namespace,
   &GDBM_WRCREAT(),   &GDBM_WRCREAT(),
   "D",$what);   "D",$what);
     if ($hashref) {      if ($hashref) {
         my @keys=split(/\&/,$what);          my @keys=split(/\&/,$what);
  foreach my $key (@keys) {   foreach my $key (@keys) {
     delete($hashref->{$key});      delete($hashref->{$key});
  }   }
  if (untie(%$hashref)) {   if (&untie_user_hash($hashref)) {
     Reply($client, "ok\n", $userinput);      &Reply($client, "ok\n", $userinput);
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
     "while attempting del\n", $userinput);      "while attempting del\n", $userinput);
  }   }
     } else {      } else {
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting del\n", $userinput);   "while attempting del\n", $userinput);
     }      }
     return 1;      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 1739  RegisterHandler("del", \&DeleteProfileEn Line 2679  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='';      my $qresult='';
     my $hashref = TieResourceHash($udom, $uname, $namespace,      my $hashref = &tie_user_hash($udom, $uname, $namespace,
   &GDBM_READER());    &GDBM_READER());
     if ($hashref) {      if ($hashref) {
  foreach my $key (keys %$hashref) {   foreach my $key (keys %$hashref) {
     $qresult.="$key&";      $qresult.="$key&";
  }   }
  if (untie(%$hashref)) {   if (&untie_user_hash($hashref)) {
     $qresult=~s/\&$//;      $qresult=~s/\&$//;
     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 keys\n", $userinput);      "while attempting keys\n", $userinput);
  }   }
     } else {      } else {
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting keys\n", $userinput);   "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 1787  RegisterHandler("keys", \&GetProfileKeys Line 2727  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);
     my $hashref = TieResourceHash($udom, $uname, $namespace,      my $hashref = &tie_user_hash($udom, $uname, $namespace,
   &GDBM_READER());   &GDBM_READER());
     if ($hashref) {      if ($hashref) {
  # Structure of %data:   # Structure of %data:
  # $data{$symb}->{$parameter}=$value;   # $data{$symb}->{$parameter}=$value;
  # $data{$symb}->{'v.'.$parameter}=$version;   # $data{$symb}->{'v.'.$parameter}=$version;
  # since $parameter will be unescaped, we do not   # since $parameter will be unescaped, we do not
   # have to worry about silly parameter names...    # have to worry about silly parameter names...
   
         my $qresult='';          my $qresult='';
  my %data = ();                     # A hash of anonymous hashes..   my %data = ();                     # A hash of anonymous hashes..
  while (my ($key,$value) = each(%$hashref)) {   while (my ($key,$value) = each(%$hashref)) {
Line 1814  sub DumpProfileDatabase { Line 2753  sub DumpProfileDatabase {
     $data{$symb}->{$param}=$value;      $data{$symb}->{$param}=$value;
     $data{$symb}->{'v.'.$param}=$v;      $data{$symb}->{'v.'.$param}=$v;
  }   }
  if (untie(%$hashref)) {   if (&untie_user_hash($hashref)) {
     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...
Line 1825  sub DumpProfileDatabase { Line 2764  sub DumpProfileDatabase {
  }   }
     }      }
     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 1862  RegisterHandler("currentdump", \&DumpPro Line 2802  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)=split(/:/,$tail);      my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
     if (defined($regexp)) {      if (defined($regexp)) {
  $regexp=&unescape($regexp);   $regexp=&unescape($regexp);
     } else {      } else {
  $regexp='.';   $regexp='.';
     }      }
     my $hashref =TieResourceHash($udom, $uname, $namespace,      my ($start,$end);
       if (defined($range)) {
    if ($range =~/^(\d+)\-(\d+)$/) {
       ($start,$end) = ($1,$2);
    } elsif ($range =~/^(\d+)$/) {
       ($start,$end) = (0,$1);
    } else {
       undef($range);
    }
       }
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
  &GDBM_READER());   &GDBM_READER());
     if ($hashref) {      if ($hashref) {
         my $qresult='';          my $qresult='';
    my $count=0;
  while (my ($key,$value) = each(%$hashref)) {   while (my ($key,$value) = each(%$hashref)) {
     if ($regexp eq '.') {      if ($regexp eq '.') {
    $count++;
    if (defined($range) && $count >= $end)   { last; }
    if (defined($range) && $count <  $start) { next; }
  $qresult.=$key.'='.$value.'&';   $qresult.=$key.'='.$value.'&';
     } else {      } else {
  my $unescapeKey = &unescape($key);   my $unescapeKey = &unescape($key);
  if (eval('$unescapeKey=~/$regexp/')) {   if (eval('$unescapeKey=~/$regexp/')) {
       $count++;
       if (defined($range) && $count >= $end)   { last; }
       if (defined($range) && $count <  $start) { next; }
     $qresult.="$key=$value&";      $qresult.="$key=$value&";
  }   }
     }      }
  }   }
  if (untie(%$hashref)) {   if (&untie_user_hash($hashref)) {
     chop($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 dump\n", $userinput);       "while attempting dump\n", $userinput);
  }   }
     } else {      } else {
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting dump\n", $userinput);   "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 1923  RegisterHandler("dump", \&DumpWithRegexp Line 2879  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";
   
Line 1935  sub StoreHandler { Line 2889  sub StoreHandler {
   
  chomp($what);   chomp($what);
  my @pairs=split(/\&/,$what);   my @pairs=split(/\&/,$what);
  my $hashref  = TieResourceHash($udom, $uname, $namespace,   my $hashref  = &tie_user_hash($udom, $uname, $namespace,
        &GDBM_WRCREAT(), "P",         &GDBM_WRCREAT(), "S",
        "$rid:$what");         "$rid:$what");
  if ($hashref) {   if ($hashref) {
     my $now = time;      my $now = time;
Line 1953  sub StoreHandler { Line 2907  sub StoreHandler {
     $hashref->{"$version:$rid:timestamp"}=$now;      $hashref->{"$version:$rid:timestamp"}=$now;
     $allkeys.='timestamp';      $allkeys.='timestamp';
     $hashref->{"$version:keys:$rid"}=$allkeys;      $hashref->{"$version:keys:$rid"}=$allkeys;
     if (untie($hashref)) {      if (&untie_user_hash($hashref)) {
  Reply($client, "ok\n", $userinput);   &Reply($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);
       }
   
       return 1;
   }
   &register_handler("store", \&store_handler, 0, 1, 0);
   
   #  Modify a set of key=value pairs associated with a versioned name.
   #
   #  Parameters:
   #    $cmd                - Request command keyword.
   #    $tail               - Tail of the request.  This is a colon
   #                          separated list containing:
   #                          domain/user - User and authentication domain.
   #                          namespace   - Name of the database being modified
   #                          rid         - Resource keyword to modify.
   #                          v           - Version item to modify
   #                          what        - new value associated with rid.
   #
   #    $client             - Socket open on the client.
   #
   #
   #  Returns:
   #      1 (keep on processing).
   #  Side-Effects:
   #    Writes to the client
   sub putstore_handler {
       my ($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", $userinput);
     } else {      } else {
  Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
  "while attempting store\n", $userinput);   "while attempting store\n", $userinput);
     }      }
  } else {   } else {
     Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".      &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
      "while attempting store\n", $userinput);       "while attempting store\n", $userinput);
  }   }
     } else {      } else {
  Failure($client, "refused\n", $userinput);   &Failure($client, "refused\n", $userinput);
     }      }
   
     return 1;      return 1;
 }  }
 RegisterHandler("store", \&StoreHandler, 0, 1, 0);  &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}=$value;
       }
       return (%hash);
   }
   sub hash_to_str {
       my ($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 3021  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:
   #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
   #    Where the 1 above represents version 1.
   #    this continues for all pairs of keys in all versions.
   #
   #
   #    
 #  #
 sub RestoreHandler {  sub restore_handler {
     my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail"; # Only used for logging purposes.      my $userinput = "$cmd:$tail"; # Only used for logging purposes.
       my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);  
     $namespace=~s/\//\_/g;      $namespace=~s/\//\_/g;
     $namespace=~s/\W//g;      $namespace = &LONCAPA::clean_username($namespace);
   
     chomp($rid);      chomp($rid);
     my $proname=propath($udom,$uname);  
     my $qresult='';      my $qresult='';
     my %hash;      my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",      if ($hashref) {
     &GDBM_READER(),0640)) {   my $version=$hashref->{"version:$rid"};
  my $version=$hash{"version:$rid"};  
  $qresult.="version=$version&";   $qresult.="version=$version&";
  my $scope;   my $scope;
  for ($scope=1;$scope<=$version;$scope++) {   for ($scope=1;$scope<=$version;$scope++) {
     my $vkeys=$hash{"$scope:keys:$rid"};      my $vkeys=$hashref->{"$scope:keys:$rid"};
     my @keys=split(/:/,$vkeys);      my @keys=split(/:/,$vkeys);
     my $key;      my $key;
     $qresult.="$scope:keys=$vkeys&";      $qresult.="$scope:keys=$vkeys&";
     foreach $key (@keys) {      foreach $key (@keys) {
  $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";   $qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
     }                                        }                                  
  }   }
  if (untie(%hash)) {   if (&untie_user_hash($hashref)) {
     $qresult=~s/\&$//;      $qresult=~s/\&$//;
     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 restore\n", $userinput);      "while attempting restore\n", $userinput);
  }   }
     } else {      } else {
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting restore\n", $userinput);   "while attempting restore\n", $userinput);
     }      }
       
Line 2030  sub RestoreHandler { Line 3069  sub RestoreHandler {
   
   
 }  }
 RegisterHandler("restore", \&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("restore", \&RestoreHand Line 3091  RegisterHandler("restore", \&RestoreHand
 #   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 3116  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)=split(/\:/,$tail);      my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
     my $reply='';      my $reply='';
     foreach (&getchat($cdom,$cnum,$udom,$uname)) {      foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
  $reply.=&escape($_).':';   $reply.=&escape($_).':';
     }      }
     $reply=~s/\:$//;      $reply=~s/\:$//;
     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 3162  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 $userinput = "$cmd:$tail";
   
     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);      my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
     $query=~s/\n*$//g;      $query=~s/\n*$//g;
     Reply($client, "". sqlreply("$clientname\&$query".      &Reply($client, "". &sql_reply("$clientname\&$query".
  "\&$arg1"."\&$arg2"."\&$arg3")."\n",   "\&$arg1"."\&$arg2"."\&$arg3")."\n",
   $userinput);    $userinput);
           
     return 1;      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 3203  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 ($cmd,$id,$reply)=split(/:/,$userinput);       my ($id,$reply)=split(/:/,$tail); 
     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")) {
Line 2178  sub ReplyQueryHandler { Line 3219  sub ReplyQueryHandler {
  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", $userinput);
     } else {      } else {
  Failure($client, "error: ".($!+0)   &Failure($client, "error: ".($!+0)
  ." IO::File->new Failed ".   ." IO::File->new Failed ".
  "while attempting queryreply\n", $userinput);   "while attempting queryreply\n", $userinput);
     }      }
Line 2188  sub ReplyQueryHandler { Line 3229  sub ReplyQueryHandler {
   
     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 2200  RegisterHandler("queryreply", \&ReplyQue Line 3242  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 2207  RegisterHandler("queryreply", \&ReplyQue Line 3257  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(/:/,$tail);      my ($udom, $what) = split(/:/, $tail,2);
     chomp($what);      chomp($what);
     $udom=~s/\W//g;  
     my $proname=  
  "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";  
     my $now=time;      my $now=time;
     my @pairs=split(/\&/,$what);      my @pairs=split(/\&/,$what);
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {      my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
  foreach my $pair (@pairs) {   foreach my $pair (@pairs) {
     my ($key,$value)=split(/=/,$pair);              my ($key,$courseinfo) = split(/=/,$pair,2);
     $hash{$key}=$value.':'.$now;              $courseinfo =~ s/=/:/g;
               my @current_items = split(/:/,$hashref->{$key},-1);
               shift(@current_items); # remove description
               pop(@current_items);   # remove last access
               my $numcurrent = scalar(@current_items);
               if ($numcurrent > 3) {
                   $numcurrent = 3;
               }
               my @new_items = split(/:/,$courseinfo,-1);
               my $numnew = scalar(@new_items);
               if ($numcurrent > 0) {
                   if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 
                       for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
                           $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
                       }
                   }
               }
       $hashref->{$key}=$courseinfo.':'.$now;
  }   }
  if (untie(%hash)) {   if (&untie_domain_hash($hashref)) {
     Reply($client, "ok\n", $userinput);      &Reply( $client, "ok\n", $userinput);
  } else {   } else {
     Failure( $client, "error: ".($!+0)      &Failure($client, "error: ".($!+0)
      ." untie(GDBM) Failed ".       ." untie(GDBM) Failed ".
      "while attempting courseidput\n", $userinput);       "while attempting courseidput\n", $userinput);
  }   }
     } else {      } else {
  Failure( $client, "error: ".($!+0)   &Failure($client, "error: ".($!+0)
  ." tie(GDBM) Failed ".   ." tie(GDBM) Failed ".
  "while attempting courseidput\n", $userinput);   "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 2262  RegisterHandler("courseidput", \&PutCour Line 3327  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,$description) =split(/:/,$tail);      my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
           $typefilter,$regexp_ok) =split(/:/,$tail);
     if (defined($description)) {      if (defined($description)) {
  $description=&unescape($description);   $description=&unescape($description);
     } else {      } else {
  $description='.';   $description='.';
     }      }
       if (defined($instcodefilter)) {
           $instcodefilter=&unescape($instcodefilter);
       } else {
           $instcodefilter='.';
       }
       my ($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='.';
       }
   
       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);
       }
   
     unless (defined($since)) { $since=0; }      unless (defined($since)) { $since=0; }
     my $qresult='';      my $qresult='';
     my $proname = "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";      my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
     my %hash;      if ($hashref) {
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {   while (my ($key,$value) = each(%$hashref)) {
  while (my ($key,$value) = each(%hash)) {      my ($descr,$lasttime,$inst_code,$owner,$type);
     my ($descr,$lasttime)=split(/\:/,$value);              my @courseitems = split(/:/,$value);
     if ($lasttime<$since) {               $lasttime = pop(@courseitems);
  next;       ($descr,$inst_code,$owner,$type)=@courseitems;
     }      if ($lasttime<$since) { next; }
     if ($description eq '.') {              my $match = 1;
  $qresult.=$key.'='.$descr.'&';      unless ($description eq '.') {
     } else {   my $unescapeDescr = &unescape($descr);
  my $unescapeVal = &unescape($descr);   unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
  if (eval('$unescapeVal=~/$description/i')) {                      $match = 0;
     $qresult.="$key=$descr&";  
  }   }
               }
               unless ($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.':'.$owner.'&';
               }
  }   }
  if (untie(%hash)) {   if (&untie_domain_hash($hashref)) {
     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 courseiddump\n", $userinput);      "while attempting courseiddump\n", $userinput);
  }   }
     } else {      } else {
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting courseiddump\n", $userinput);   "while attempting courseiddump\n", $userinput);
     }      }
   
   
     return 1;      return 1;
 }  }
 RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);  &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
   
   #
   # Puts an unencrypted entry in a namespace db file at the domain level 
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #  Side effects:
   #     reply is written to $client.
   #
   sub put_domain_handler {
       my ($cmd,$tail,$client) = @_;
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$namespace,$what) =split(/:/,$tail,3);
       chomp($what);
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
                                      "P", $what);
       if ($hashref) {
           foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               $hashref->{$key}=$value;
           }
           if (&untie_domain_hash($hashref)) {
               &Reply($client, "ok\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                        "while attempting putdom\n", $userinput);
           }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                     "while attempting putdom\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
   
   # Unencrypted get from the namespace database file at the domain level.
   # This function retrieves a keyed item from a specific named database in the
   # domain directory.
   #
   # Parameters:
   #   $cmd             - Command request keyword (get).
   #   $tail            - Tail of the command.  This is a colon separated list
   #                      consisting of the domain and the 'namespace' 
   #                      which selects the gdbm file to do the lookup in,
   #                      & separated list of keys to lookup.  Note that
   #                      the values are returned as an & separated list too.
   #   $client          - File descriptor open on the client.
   # Returns:
   #   1       - Continue processing.
   #   0       - Exit.
   #  Side effects:
   #     reply is written to $client.
   #
   
   sub get_domain_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$client:$tail";
   
       my ($udom,$namespace,$what)=split(/:/,$tail,3);
       chomp($what);
       my @queries=split(/\&/,$what);
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
       if ($hashref) {
           for (my $i=0;$i<=$#queries;$i++) {
               $qresult.="$hashref->{$queries[$i]}&";
           }
           if (&untie_domain_hash($hashref)) {
               $qresult=~s/\&$//;
               &Reply($client, "$qresult\n", $userinput);
           } else {
               &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                         "while attempting getdom\n",$userinput);
           }
       } else {
           &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                    "while attempting getdom\n",$userinput);
       }
   
       return 1;
   }
   &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
   
   
 #  #
 #  Puts an id to a domains id database.   #  Puts an id to a domains id database. 
 #  #
Line 2331  RegisterHandler("courseiddump", \&DumpCo Line 3599  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);
     $udom=~s/\W//g;  
     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";  
     my $now=time;  
     {  
  my $hfh;  
  if ($hfh=IO::File->new(">>$proname.hist")) {   
     print $hfh "P:$now:$what\n";   
  }  
     }  
     my @pairs=split(/\&/,$what);      my @pairs=split(/\&/,$what);
     my %hash;      my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {     "P", $what);
       if ($hashref) {
  foreach my $pair (@pairs) {   foreach my $pair (@pairs) {
     my ($key,$value)=split(/=/,$pair);      my ($key,$value)=split(/=/,$pair);
     $hash{$key}=$value;      $hashref->{$key}=$value;
  }   }
  if (untie(%hash)) {   if (&untie_domain_hash($hashref)) {
     Reply($client, "ok\n", $userinput);      &Reply($client, "ok\n", $userinput);
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
     "while attempting idput\n", $userinput);       "while attempting idput\n", $userinput);
  }   }
     } else {      } else {
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting idput\n", $userinput);    "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 2390  RegisterHandler("idput", \&PutIdHandler, Line 3649  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);
     $udom=~s/\W//g;  
     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";  
     my @queries=split(/\&/,$what);      my @queries=split(/\&/,$what);
     my $qresult='';      my $qresult='';
     my %hash;      my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {      if ($hashref) {
  for (my $i=0;$i<=$#queries;$i++) {   for (my $i=0;$i<=$#queries;$i++) {
     $qresult.="$hash{$queries[$i]}&";      $qresult.="$hashref->{$queries[$i]}&";
  }   }
  if (untie(%hash)) {   if (&untie_domain_hash($hashref)) {
     $qresult=~s/\&$//;      $qresult=~s/\&$//;
     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 idget\n",$userinput);        "while attempting idget\n",$userinput);
  }   }
     } else {      } else {
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  "while attempting idget\n",$userinput);   "while attempting idget\n",$userinput);
       }
       
       return 1;
   }
   &register_handler("idget", \&get_id_handler, 0, 1, 0);
   
   #
   # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
   #
   # Parameters
   #   $cmd       - Command keyword that caused us to be dispatched.
   #   $tail      - Tail of the command.  Consists of a colon separated:
   #               domain - the domain whose dcmail we are recording
   #               email    Consists of key=value pair 
   #                        where key is unique msgid
   #                        and value is message (in XML)
   #   $client    - Socket open on the client.
   #
   # Returns:
   #    1 - indicating processing should continue.
   # Side effects
   #     reply is written to $client.
   #
   sub put_dcmail_handler {
       my ($cmd,$tail,$client) = @_;
       my $userinput = "$cmd:$tail";
                                                                                   
       my ($udom,$what)=split(/:/,$tail);
       chomp($what);
       my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
       if ($hashref) {
           my ($key,$value)=split(/=/,$what);
           $hashref->{$key}=$value;
       }
       if (&untie_domain_hash($hashref)) {
           &Reply($client, "ok\n", $userinput);
       } else {
           &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                    "while attempting dcmailput\n", $userinput);
       }
       return 1;
   }
   &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
   
   #
   # 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.
   #
   
   sub put_domainroles_handler {
       my ($cmd,$tail,$client) = @_;
   
       my $userinput = "$cmd:$tail";
       my ($udom,$what)=split(/:/,$tail);
       chomp($what);
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
       if ($hashref) {
           foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               $hashref->{$key}=$value;
           }
           if (&untie_domain_hash($hashref)) {
               &Reply($client, "ok\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                        "while attempting domroleput\n", $userinput);
           }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                     "while attempting domroleput\n", $userinput);
       }
                                                                                     
     return 1;      return 1;
 }  }
   
 RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);  &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
   
   #
   # Retrieves domain roles from nohist_domainroles database
   # Returns to client an & separated list of key=value pairs,
   # where key is role and value is start and end date 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 domain roles table we dump
   #   $client    - Socket open on the client.
   #
   # Returns:
   #    1 - indicating processing should continue.
   # Side effects
   #     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  #  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  #  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.  # where Id is the client's ip concatenated with a sequence number.
Line 2441  RegisterHandler("idget", \&GetIdHandler, Line 3949  RegisterHandler("idget", \&GetIdHandler,
 # Side effects:  # Side effects:
 #   A file is created in the local filesystem.  #   A file is created in the local filesystem.
 #   A reply is sent to the client.  #   A reply is sent to the client.
 sub TmpPutHandler {  sub tmp_put_handler {
     my $cmd       = shift;      my ($cmd, $what, $client) = @_;
     my $what      = shift;  
     my $client    = shift;  
   
     my $userinput = "$cmd:$what"; # Reconstruct for logging.      my $userinput = "$cmd:$what"; # Reconstruct for logging.
   
       my ($record,$context) = split(/:/,$what);
     my $store;      if ($context ne '') {
           chomp($context);
           $context = &unescape($context);
       }
       my ($id,$store);
     $tmpsnum++;      $tmpsnum++;
     my $id=$$.'_'.$clientip.'_'.$tmpsnum;      if ($context eq 'resetpw') {
           $id = &md5_hex(&md5_hex(time.{}.rand().$$));
       } else {
           $id = $$.'_'.$clientip.'_'.$tmpsnum;
       }
     $id=~s/\W/\_/g;      $id=~s/\W/\_/g;
     $what=~s/\n//g;      $record=~s/\n//g;
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {      if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
  print $store $what;   print $store $record;
  close $store;   close $store;
  Reply($client, "$id\n", $userinput);   &Reply($client, "$id\n", $userinput);
     } else {      } else {
  Failure( $client, "error: ".($!+0)."IO::File->new Failed ".   &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
  "while attempting tmpput\n", $userinput);    "while attempting tmpput\n", $userinput);
     }      }
     return 1;      return 1;
       
 }  }
 RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0);  &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
   
 #   Processes the tmpget command.  This command returns the contents  #   Processes the tmpget command.  This command returns the contents
 #  of a temporary resource file(?) created via tmpput.  #  of a temporary resource file(?) created via tmpput.
Line 2480  RegisterHandler("tmpput", \&TmpPutHandle Line 3994  RegisterHandler("tmpput", \&TmpPutHandle
 #    1         - Inidcating processing can continue.  #    1         - Inidcating processing can continue.
 # Side effects:  # Side effects:
 #   A reply is sent to the client.  #   A reply is sent to the client.
   
 #  #
 sub TmpGetHandler {  sub tmp_get_handler {
     my $cmd       = shift;      my ($cmd, $id, $client) = @_;
     my $id        = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$id";       my $userinput = "$cmd:$id"; 
       
   
     chomp($id);  
     $id=~s/\W/\_/g;      $id=~s/\W/\_/g;
     my $store;      my $store;
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {      if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
  my $reply=<$store>;   my $reply=<$store>;
  Reply( $client, "$reply\n", $userinput);   &Reply( $client, "$reply\n", $userinput);
  close $store;   close $store;
     } else {      } else {
  Failure( $client, "error: ".($!+0)."IO::File->new Failed ".   &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
  "while attempting tmpget\n", $userinput);    "while attempting tmpget\n", $userinput);
     }      }
   
     return 1;      return 1;
 }  }
 RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0);  &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
   
 #  #
 #  Process the tmpdel command.  This command deletes a temp resource  #  Process the tmpdel command.  This command deletes a temp resource
 #  created by the tmpput command.  #  created by the tmpput command.
Line 2518  RegisterHandler("tmpget", \&TmpGetHandle Line 4031  RegisterHandler("tmpget", \&TmpGetHandle
 # Side Effects:  # Side Effects:
 #   A file is deleted  #   A file is deleted
 #   A reply is sent to the client.  #   A reply is sent to the client.
 sub TmpDelHandler {  sub tmp_del_handler {
     my $cmd      = shift;      my ($cmd, $id, $client) = @_;
     my $id       = shift;      
     my $client   = shift;  
   
     my $userinput= "$cmd:$id";      my $userinput= "$cmd:$id";
       
     chomp($id);      chomp($id);
     $id=~s/\W/\_/g;      $id=~s/\W/\_/g;
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     if (unlink("$execdir/tmp/$id.tmp")) {      if (unlink("$execdir/tmp/$id.tmp")) {
  Reply($client, "ok\n", $userinput);   &Reply($client, "ok\n", $userinput);
     } else {      } else {
  Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".   &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
  "while attempting tmpdel\n", $userinput);    "while attempting tmpdel\n", $userinput);
     }      }
       
     return 1;      return 1;
   
 }  }
 RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0);  &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
 #  
 #   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 LsHandler {  
     my $cmd     = shift;  
     my $ulsdir  = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$ulsdir";  
   
     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);  
   
   
     return 1;  
 }  
 RegisterHandler("ls", \&LsHandler, 0, 1, 0);  
   
   
 #  #
 #   Processes the setannounce command.  This command  #   Processes the setannounce command.  This command
Line 2609  RegisterHandler("ls", \&LsHandler, 0, 1, Line 4070  RegisterHandler("ls", \&LsHandler, 0, 1,
 #   The file {DocRoot}/announcement.txt is created.  #   The file {DocRoot}/announcement.txt is created.
 #   A reply is sent to $client.  #   A reply is sent to $client.
 #  #
 sub SetAnnounceHandler {  sub set_announce_handler {
     my $cmd          = shift;      my ($cmd, $announcement, $client) = @_;
     my $announcement = shift;  
     my $client       = shift;  
       
     my $userinput    = "$cmd:$announcement";      my $userinput    = "$cmd:$announcement";
   
Line 2622  sub SetAnnounceHandler { Line 4081  sub SetAnnounceHandler {
  '/announcement.txt')) {   '/announcement.txt')) {
  print $store $announcement;   print $store $announcement;
  close $store;   close $store;
  Reply($client, "ok\n", $userinput);   &Reply($client, "ok\n", $userinput);
     } else {      } else {
  Failure($client, "error: ".($!+0)."\n", $userinput);   &Failure($client, "error: ".($!+0)."\n", $userinput);
     }      }
   
     return 1;      return 1;
 }  }
 RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0);  &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
   
 #  #
 #  Return the version of the daemon.  This can be used to determine  #  Return the version of the daemon.  This can be used to determine
Line 2644  RegisterHandler("setannounce", \&SetAnno Line 4103  RegisterHandler("setannounce", \&SetAnno
 #   1 - continue processing requests.  #   1 - continue processing requests.
 # Side Effects:  # Side Effects:
 #   Replies with version to $client.  #   Replies with version to $client.
 sub GetVersionHandler {  sub get_version_handler {
     my $client     = shift;      my ($cmd, $tail, $client) = @_;
     my $tail       = shift;  
     my $client     = shift;      my $userinput  = $cmd.$tail;
     my $userinput  = $client;  
           
     Reply($client, &version($userinput)."\n", $userinput);      &Reply($client, &version($userinput)."\n", $userinput);
   
   
     return 1;      return 1;
 }  }
 RegisterHandler("version", \&GetVersionHandler, 0, 1, 0);  &register_handler("version", \&get_version_handler, 0, 1, 0);
   
 #  Set the current host and domain.  This is used to support  #  Set the current host and domain.  This is used to support
 #  multihomed systems.  Each IP of the system, or even separate daemons  #  multihomed systems.  Each IP of the system, or even separate daemons
Line 2674  RegisterHandler("version", \&GetVersionH Line 4132  RegisterHandler("version", \&GetVersionH
 #     The default domain/system context is modified for this daemon.  #     The default domain/system context is modified for this daemon.
 #     a reply is sent to the client.  #     a reply is sent to the client.
 #  #
 sub SelectHostHandler {  sub set_virtual_host_handler {
     my $cmd        = shift;      my ($cmd, $tail, $socket) = @_;
     my $tail       = shift;  
     my $socket     = shift;  
       
     my $userinput  ="$cmd:$tail";      my $userinput  ="$cmd:$tail";
   
     Reply($client, &sethost($userinput)."\n", $userinput);      &Reply($client, &sethost($userinput)."\n", $userinput);
   
   
     return 1;      return 1;
 }  }
 RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0);  &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
   
 #  Process a request to exit:  #  Process a request to exit:
 #   - "bye" is sent to the client.  #   - "bye" is sent to the client.
Line 2699  RegisterHandler("sethost", \&SelectHostH Line 4155  RegisterHandler("sethost", \&SelectHostH
 # Returns:  # Returns:
 #   0      - Indicating the program should exit!!  #   0      - Indicating the program should exit!!
 #  #
 sub ExitHandler {  sub exit_handler {
     my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
   
     &logthis("Client $clientip ($clientname) hanging up: $userinput");      &logthis("Client $clientip ($clientname) hanging up: $userinput");
     Reply($client, "bye\n", $userinput);      &Reply($client, "bye\n", $userinput);
     $client->shutdown(2);        # shutdown the socket forcibly.      $client->shutdown(2);        # shutdown the socket forcibly.
     $client->close();      $client->close();
   
     return 0;      return 0;
 }  }
 RegisterHandler("exit", \&ExitHandler, 0, 1,1);  &register_handler("exit", \&exit_handler, 0,1,1);
 RegisterHandler("init", \&ExitHandler, 0, 1,1); # RE-init is like exit.  &register_handler("init", \&exit_handler, 0,1,1);
 RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too!  &register_handler("quit", \&exit_handler, 0,1,1);
 #------------------------------------------------------------------------------------  
 #  #  Determine if auto-enrollment is enabled.
 #   Process a Request.  Takes a request from the client validates  #  Note that the original had what I believe to be a defect.
 #   it and performs the operation requested by it.  Returns  #  The original returned 0 if the requestor was not a registerd client.
 #   a response to the client.  #  It should return "refused".
 #  # Formal Parameters:
 #  Parameters:  #   $cmd       - The command that invoked us.
 #      request      - A string containing the user's request.  #   $tail      - The tail of the command (Extra command parameters.
 #  Returns:  #   $client    - The socket open on the client that issued the request.
 #      0            - Requested to exit, caller should shut down.  # Returns:
 #      1            - Accept additional requests from the client.  #    1         - Indicating processing should continue.
 #  #
 sub ProcessRequest {  sub enrollment_enabled_handler {
     my $Request      = shift;      my ($cmd, $tail, $client) = @_;
     my $KeepGoing    = 1; # Assume we're not asked to stop.      my $userinput = $cmd.":".$tail; # For logging purposes.
   
           
     my $wasenc=0;      my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
     my $userinput = $Request;   # for compatibility with oldcode <yeach>  
   
       my $outcome  = &localenroll::run($cdom);
       &Reply($client, "$outcome\n", $userinput);
   
 # ------------------------------------------------------------ See if encrypted      return 1;
      }
     if($userinput =~ /^enc/) {  &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
  $wasenc = 1;  
  $userinput = Decipher($userinput);  
  if(! $userinput) {  
     Failure($client,"error:Encrypted data without negotiating key");  
     return 0;                      # Break off with this imposter.  
  }  
     }  
     # Split off the request keyword from the rest of the stuff.  
      
     my ($command, $tail) = split(/:/, $userinput, 2);  
   
     Debug("Command received: $command, encoded = $wasenc");  #   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";
   
          my ($coursecode, $cdom) = split(/:/, $tail);
 # ------------------------------------------------------------- Normal commands      my @secs = &localenroll::get_sections($coursecode,$cdom);
       my $seclist = &escape(join(':',@secs));
   
     #       &Reply($client, "$seclist\n", $userinput);
     #   If the command is in the hash, then execute it via the hash dispatch:      
     #  
     if(defined $Dispatcher{$command}) {  
   
  my $DispatchInfo = $Dispatcher{$command};      return 1;
  my $Handler      = $$DispatchInfo[0];  }
  my $NeedEncode   = $$DispatchInfo[1];  &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
  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) {  #   Validate the owner of a new course section.  
     Debug("Dispatching to handler $command $tail");  #
     $KeepGoing = &$Handler($command, $tail, $client);  # Formal Parameters:
  } else {  #   $cmd      - Command that got us dispatched.
     Debug("Refusing to dispatch because ok is false");  #   $tail     - the remainder of the command.  For us this consists of a
     Failure($client, "refused", $userinput);  #               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?)..
   #   $client   - Socket open on the client.
   #
   # Returns:
   #   1        - Processing should continue.
   #
   sub validate_course_owner_handler {
       my ($cmd, $tail, $client)  = @_;
       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);
   
 # ------------------------------------------------------------- unknown command  
   
     } else {  
  # unknown command  
  Failure($client, "unknown_cmd\n", $userinput);  
     }  
   
     return $KeepGoing;      return 1;
 }  }
   &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
   
 #  #
 #   GetCertificate: Given a transaction that requires a certificate,  #   Validate a course section in the official schedule of classes
 #   this function will extract the certificate from the transaction  #   from the institutions point of view (part of autoenrollment).
 #   request.  Note that at this point, the only concept of a certificate  
 #   is the hostname to which we are connected.  
 #  #
 #   Parameter:  # Formal Parameters:
 #      request   - The request sent by our client (this parameterization may  #   $cmd          - The command request that got us dispatched.
 #                  need to change when we really use a certificate granting  #   $tail         - The tail of the command.  In this case,
 #                  authority.  #                   this is a colon separated set of words that will be split
   #                   into:
   #                        $inst_course_id - The course/section id from the
   #                                          institutions point of view.
   #                        $cdom           - The domain from the institutions
   #                                          point of view.
   #   $client       - Socket open on the client.
   # Returns:
   #    1           - Indicating processing should continue.
 #  #
 sub GetCertificate {  sub validate_course_section_handler {
     my $request = shift;      my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($inst_course_id, $cdom) = split(/:/, $tail);
   
     return $clientip;      my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
 }      &Reply($client, "$outcome\n", $userinput);
   
   
       return 1;
   }
   &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
   
 #  #
 #   ReadManagerTable: Reads in the current manager table. For now this is  #   Validate course owner's access to enrollment data for specific class section. 
 #                     done on each manager authentication because:  #   
 #                     - These authentications are not frequent  #
 #                     - This allows dynamic changes to the manager table  # Formal Parameters:
 #                       without the need to signal to the lond.  #    $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.
 #  #
   
 sub ReadManagerTable {  sub validate_class_access_handler {
       my ($cmd, $tail, $client) = @_;
     #   Clean out the old table first..      my $userinput = "$cmd:$tail";
       my ($inst_class,$courseowner,$cdom) = split(/:/, $tail);
     foreach my $key (keys %managers) {      $courseowner = &unescape($courseowner);
  delete $managers{$key};      my $outcome;
     }      eval {
    local($SIG{__DIE__})='DEFAULT';
    $outcome=&localenroll::check_section($inst_class,$courseowner,$cdom);
       };
       &Reply($client,"$outcome\n", $userinput);
   
     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";      return 1;
     if (!open (MANAGERS, $tablename)) {  
  logthis('<font color="red">No manager table.  Nobody can manage!!</font>');  
  return;  
     }  
     while(my $host = <MANAGERS>) {  
  chomp($host);  
  if ($host =~ "^#") {                  # Comment line.  
     logthis('<font color="green"> Skipping line: '. "$host</font>\n");  
     next;  
  }  
  if (!defined $hostip{$host}) { # This is a non cluster member  
     #  The entry is of the form:  
     #    cluname:hostname  
     #  cluname - A 'cluster hostname' is needed in order to negotiate  
     #            the host key.  
     #  hostname- The dns name of the host.  
     #  
     my($cluname, $dnsname) = split(/:/, $host);  
       
     my $ip = gethostbyname($dnsname);  
     if(defined($ip)) {                 # bad names don't deserve entry.  
  my $hostip = inet_ntoa($ip);  
  $managers{$hostip} = $cluname;  
  logthis('<font color="green"> registering manager '.  
  "$dnsname as $cluname with $hostip </font>\n");  
     }  
  } else {  
     logthis('<font color="green"> existing host'." $host</font>\n");  
     $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber  
  }  
     }  
 }  }
   &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
   
 #  #
 #  ValidManager: Determines if a given certificate represents a valid manager.  #   Create a password for a new LON-CAPA user added by auto-enrollment.
 #                in this primitive implementation, the 'certificate' is  #   Only used for case where authentication method for new user is localauth
 #                just the connecting loncapa client name.  This is checked  
 #                against a valid client list in the configuration.  
 #  #
 #                    # Formal Parameters:
 sub ValidManager {  #    $cmd     - The command request that got us dispatched.
     my $certificate = shift;   #    $tail    - The tail of the command.   In this case this is a colon separated
   #               set of words that will be split into:
     return isManager;  #               $authparam - An authentication parameter (localauth parameter).
 }  #               $cdom      - The domain of the course from the institution's
 #  #                            point of view.
 #  CopyFile:  Called as part of the process of installing a   #    $client  - The socket open on the client.
 #             new configuration file.  This function copies an existing  # Returns:
 #             file to a backup file.  #    1 - continue processing.
 # 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 {  sub create_auto_enroll_password_handler {
     my $oldfile = shift;      my ($cmd, $tail, $client) = @_;
     my $newfile = shift;      my $userinput = "$cmd:$tail";
   
     #  The file must exist:  
   
     if(-e $oldfile) {      my ($authparam, $cdom) = split(/:/, $userinput);
   
  # Read the old file.      my ($create_passwd,$authchk);
       ($authparam,
        $create_passwd,
        $authchk) = &localenroll::create_password($authparam,$cdom);
   
  my $oldfh = IO::File->new("< $oldfile");      &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
  if(!$oldfh) {     $userinput);
     return 0;  
  }  
  my @contents = <$oldfh>;  # Suck in the entire file.  
   
  # write the backup file:  
   
  my $newfh = IO::File->new("> $newfile");  
  if(!(defined $newfh)){  
     return 0;  
  }  
  my $lines = scalar @contents;  
  for (my $i =0; $i < $lines; $i++) {  
     print $newfh ($contents[$i]);  
  }  
   
  $oldfh->close;      return 1;
  $newfh->close;  }
   &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
     0, 1, 0);
   
  chmod(0660, $newfile);  #   Retrieve and remove temporary files created by/during autoenrollment.
   #
   # Formal Parameters:
   #    $cmd      - The command that got us dispatched.
   #    $tail     - The tail of the command.  In our case this is a colon 
   #                separated list that will be split into:
   #                $filename - The name of the file to remove.
   #                            The filename is given as a path relative to
   #                            the LonCAPA temp file directory.
   #    $client   - Socket open on the client.
   #
   # Returns:
   #   1     - Continue processing.
   sub retrieve_auto_file_handler {
       my ($cmd, $tail, $client)    = @_;
       my $userinput                = "cmd:$tail";
   
       my ($filename)   = split(/:/, $tail);
   
       my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
       if ( (-e $source) && ($filename ne '') ) {
    my $reply = '';
    if (open(my $fh,$source)) {
       while (<$fh>) {
    chomp($_);
    $_ =~ s/^\s+//g;
    $_ =~ s/\s+$//g;
    $reply .= $_;
       }
       close($fh);
       &Reply($client, &escape($reply)."\n", $userinput);
   
  return 1;  #   Does this have to be uncommented??!?  (RF).
       #
   #                                unlink($source);
    } else {
       &Failure($client, "error\n", $userinput);
    }
     } else {      } else {
  return 0;   &Failure($client, "error\n", $userinput);
     }      }
       
   
       return 1;
 }  }
   &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
   
 #  #
 #  Host files are passed out with externally visible host IPs.  #   Read and retrieve institutional code format (for support form).
 #  If, for example, we are behind a fire-wall or NAT host, our   # Formal Parameters:
 #  internally visible IP may be different than the externally  #    $cmd        - Command that dispatched us.
 #  visible IP.  Therefore, we always adjust the contents of the  #    $tail       - Tail of the command.  In this case it conatins 
 #  host file so that the entry for ME is the IP that we believe  #                  the course domain and the coursename.
 #  we have.  At present, this is defined as the entry that  #    $client     - Socket open on the client.
 #  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:  # Returns:
 #     newcontents - The adjusted contents.  #    1     - Continue processing.
 #  
 #  #
 sub AdjustHostContents {  sub get_institutional_code_format_handler {
     my $contents  = shift;      my ($cmd, $tail, $client)   = @_;
     my $adjusted;      my $userinput               = "$cmd:$tail";
     my $me        = $perlvar{'lonHostID'};  
       my $reply;
     foreach my $line (split(/\n/,$contents)) {      my($cdom,$course) = split(/:/,$tail);
  if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {      my @pairs = split/\&/,$course;
     chomp($line);      my %instcodes = ();
     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);      my %codes = ();
     if ($id eq $me) {      my @codetitles = ();
  my $ip = gethostbyname($name);      my %cat_titles = ();
  my $ipnew = inet_ntoa($ip);      my %cat_order = ();
  $ip = $ipnew;      foreach (@pairs) {
  #  Reconstruct the host line and append to adjusted:   my ($key,$value) = split/=/,$_;
    $instcodes{&unescape($key)} = &unescape($value);
  my $newline = "$id:$domain:$role:$name:$ip";      }
  if($maxcon ne "") { # Not all hosts have loncnew tuning params      my $formatreply = &localenroll::instcode_format($cdom,
     $newline .= ":$maxcon:$idleto:$mincon";      \%instcodes,
  }      \%codes,
  $adjusted .= $newline."\n";      \@codetitles,
       \%cat_titles,
     } else { # Not me, pass unmodified.      \%cat_order);
  $adjusted .= $line."\n";      if ($formatreply eq 'ok') {
     }   my $codes_str = &Apache::lonnet::hash2str(%codes);
  } else {                  # Blank or comment never re-written.   my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
     $adjusted .= $line."\n"; # Pass blanks and comments as is.   my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
  }   my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
    &Reply($client,
          $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
          .$cat_order_str."\n",
          $userinput);
       } else {
    # this else branch added by RF since if not ok, lonc will
    # hang waiting on reply until timeout.
    #
    &Reply($client, "format_error\n", $userinput);
     }      }
     return $adjusted;      
       return 1;
 }  }
 #  &register_handler("autoinstcodeformat",
 #   InstallFile: Called to install an administrative file:    \&get_institutional_code_format_handler,0,1,0);
 #       - 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.  
 #  
 #  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:  sub get_institutional_defaults_handler {
           my ($cmd, $tail, $client)   = @_;
     my $fh = IO::File->new("> $TempFile"); # Write to temp.      my $userinput               = "$cmd:$tail";
     if(!(defined $fh)) {  
  &logthis('<font color="red"> Unable to create '.$TempFile."</font>");      my $dom = $tail;
  return 0;      my %defaults_hash;
       my @code_order;
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
                                                      \@code_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               while (my ($key,$value) = each(%defaults_hash)) {
                   $result.=&escape($key).'='.&escape($value).'&';
               }
               $result .= 'code_order='.&escape(join('&',@code_order));
               &Reply($client,$result."\n",$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
     }      }
     #  write the contents of the file:  }
       &register_handler("autoinstcodedefaults",
     print $fh ($Contents);                     \&get_institutional_defaults_handler,0,1,0);
     $fh->close; # In case we ever have a filesystem w. locking  
   
     chmod(0660, $TempFile);  sub get_institutional_user_rules {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $dom = &unescape($tail);
       my (%rules_hash,@rules_order);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::username_rules($dom,\%rules_hash,\@rules_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result;
               foreach my $key (keys(%rules_hash)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
               }
               $result =~ s/\&$//;
               $result .= ':';
               if (@rules_order > 0) {
                   foreach my $item (@rules_order) {
                       $result .= &escape($item).'&';
                   }
               }
               $result =~ s/\&$//;
               &Reply($client,$result."\n",$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instuserrules",\&get_institutional_user_rules,0,1,0);
   
     # Now we can move install the file in position.  
       
     move($TempFile, $Filename);  
   
     return 1;  sub institutional_username_check {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my %rulecheck;
       my $outcome;
       my ($udom,$uname,@rules) = split(/:/,$tail);
       $udom = &unescape($udom);
       $uname = &unescape($uname);
       @rules = map {&unescape($_);} (@rules);
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::username_check($udom,$uname,\@rules,\%rulecheck);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               foreach my $key (keys(%rulecheck)) {
                   $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
               }
               &Reply($client,$result."\n",$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
 }  }
   &register_handler("instrulecheck",\&institutional_username_check,0,1,0);
   
   
   # Get domain specific conditions for import of student photographs to a course
 #  #
 #   ConfigFileFromSelector: converts a configuration file selector  # Retrieves information from photo_permission subroutine in localenroll.
 #                 (one of host or domain at this point) into a   # Returns outcome (ok) if no processing errors, and whether course owner is 
 #                 configuration file pathname.  # required to accept conditions of use (yes/no).
 #  
 #  Parameters:  
 #      selector  - Configuration file selector.  
 #  Returns:  
 #      Full path to the file or undef if the selector is invalid.  
 #  #
 sub ConfigFileFromSelector {  #    
     my $selector   = shift;  sub photo_permission_handler {
     my $tablefile;      my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
     my $tabledir = $perlvar{'lonTabDir'}.'/';      my $cdom = $tail;
     if ($selector eq "hosts") {      my ($perm_reqd,$conditions);
  $tablefile = $tabledir."hosts.tab";      my $outcome;
     } elsif ($selector eq "domain") {      eval {
  $tablefile = $tabledir."domain.tab";   local($SIG{__DIE__})='DEFAULT';
    $outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
     \$conditions);
       };
       if (!$@) {
    &Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
          $userinput);
     } else {      } else {
  return undef;   &Failure($client,"unknown_cmd\n",$userinput);
     }      }
     return $tablefile;      return 1;
   
 }  }
 #  &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
 #   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.  
     #  
   
   #
   # 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.   
   
     my $tablefile = ConfigFileFromSelector($filename);  sub photo_check_handler {
     if(! (defined $tablefile)) {      my ($cmd, $tail, $client)   = @_;
  return "refused";      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;
     # >copy< the old table to the backup table      my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
     #        don't rename in case system crashes/reboots etc. in the time      $result .= ':'.$response;
     #        window between a rename and write.      &Reply($client, &escape($result)."\n",$userinput);
     #      return 1;
     my $backupfile = $tablefile;  }
     $backupfile    =~ s/\.tab$/.old/;  &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
     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);  # Retrieve information from localenroll about whether to provide a button     
   # for users who have enbled import of student photos to initiate an 
   # update of photo files for registered students. Also include 
   # comment to display alongside button.  
   
   sub photo_choice_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput             = "$cmd:$tail";
       my $cdom                  = &unescape($tail);
       my ($update,$comment);
       eval {
    local($SIG{__DIE__})='DEFAULT';
    ($update,$comment)    = &localenroll::manager_photo_update($cdom);
       };
       if (!$@) {
    &Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
       } else {
    &Failure($client,"unknown_cmd\n",$userinput);
     }      }
       return 1;
   }
   &register_handler("autophotochoice",\&photo_choice_handler,0,1,0);
   
     #  Install the new file:  #
   # Gets a student's photo to exist (in the correct image type) in the user's 
   # directory.
   # Formal Parameters:
   #    $cmd     - The command request that got us dispatched.
   #    $tail    - A colon separated set of words that will be split into:
   #               $domain - student's domain
   #               $uname  - student username
   #               $type   - image type desired
   #    $client  - The socket open on the client.
   # Returns:
   #    1 - continue processing.
   
     if(!InstallFile($tablefile, $contents)) {  sub student_photo_handler {
  &logthis('<font color="red"> Pushfile: unable to install '      my ($cmd, $tail, $client) = @_;
  .$tablefile." $! </font>");      my ($domain,$uname,$ext,$type) = split(/:/, $tail);
  return "error:$!";  
       my $path=&propath($domain,$uname). '/userfiles/internal/';
       my $filename = 'studentphoto.'.$ext;
       if ($type eq 'thumbnail') {
           $filename = 'studentphoto_tn.'.$ext;
       }
       if (-e $path.$filename) {
    &Reply($client,"ok\n","$cmd:$tail");
    return 1;
       }
       &mkpath($path);
       my $file;
       if ($type eq 'thumbnail') {
    eval {
       local($SIG{__DIE__})='DEFAULT';
       $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
    };
     } else {      } else {
  &logthis('<font color="green"> Installed new '.$tablefile          $file=&localstudentphoto::fetch($domain,$uname);
  ."</font>");  
   
     }      }
       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);
   
   sub inst_usertypes_handler {
       my ($cmd, $domain, $client) = @_;
       my $res;
       my $userinput = $cmd.":".$domain; # For logging purposes.
       my (%typeshash,@order,$result);
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
       };
       if ($result eq 'ok') {
           if (keys(%typeshash) > 0) {
               foreach my $key (keys(%typeshash)) {
                   $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
               }
           }
           $res=~s/\&$//;
           $res .= ':';
           if (@order > 0) {
               foreach my $item (@order) {
                   $res .= &escape($item).'&';
               }
           }
           $res=~s/\&$//;
       }
       &Reply($client, "$res\n", $userinput);
       return 1;
   }
   &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
   
     #  Indicate success:  # mkpath makes all directories for a file, expects an absolute path with a
    # file or a trailing / if just a dir is passed
     return "ok";  # 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;
 }  }
   
   #---------------------------------------------------------------
 #  #
 #  Called to re-init either lonc or lond.  #   Getting, decoding and dispatching requests:
 #  
 #  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.  
 #  #
   #   Get a Request:
   #   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 ReinitProcess {  sub get_request {
     my $request = shift;      my $input = <$client>;
       chomp($input);
   
       &Debug("get_request: Request = $input\n");
   
     # separate the request (reinit) from the process identifier and      &status('Processing '.$clientname.':'.$input);
     # validate it producing the name of the .pid file for the process.  
     #      return $input;
     #  
     my ($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:  
 #     scriptline - A line to validate (\n has been stripped for what it's worth).  
 #  #
 #   Return:  #  Process a request.  This sub should shrink as each action
 #      0     - Invalid scriptline.  #  gets farmed out into a separat sub that is registered 
 #      1     - Valid scriptline  #  with the dispatch hash.  
 #  NOTE:  
 #     Only the command syntax is checked, not the executability of the  
 #     command.  
 #  #
 sub isValidEditCommand {  # Parameters:
     my $scriptline = shift;  #    user_input   - The request received from the client (lonc).
   # Returns:
     #   Line elements are pipe separated:  #    true to keep processing, false if caller should exit.
   #
     my ($command, $key, $newline)  = split(/\|/, $scriptline);  sub process_request {
     &logthis('<font color="green"> isValideditCommand checking: '.      my ($userinput) = @_;      # Easier for now to break style than to
      "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");                                  # fix all the userinput -> user_input.
           my $wasenc    = 0; # True if request was encrypted.
     if ($command eq "delete") {  # ------------------------------------------------------------ See if encrypted
  #      # for command
  #   key with no newline.      # sethost:<server>
  #      # <command>:<args>
  if( ($key eq "") || ($newline ne "")) {      #   we just send it to the processor
     return 0; # Must have key but no newline.      # for
  } else {      # sethost:<server>:<command>:<args>
     return 1; # Valid syntax.      #  we do the implict set host and then do the command
  }      if ($userinput =~ /^sethost:/) {
     } elsif ($command eq "replace") {   (my $cmd,my $newid,$userinput) = split(':',$userinput,3);
  #   if (defined($userinput)) {
  #   key and newline:      &sethost("$cmd:$newid");
  #  
  if (($key eq "") || ($newline eq "")) {  
     return 0;  
  } else {   } else {
     return 1;      $userinput = "$cmd:$newid";
  }   }
     } elsif ($command eq "append") {      }
  if (($key ne "") && ($newline eq "")) {  
     return 1;      if ($userinput =~ /^enc/) {
  } else {   $userinput = decipher($userinput);
    $wasenc=1;
    if(!$userinput) { # Cipher not defined.
       &Failure($client, "error: Encrypted data without negotated key\n");
     return 0;      return 0;
  }   }
     } else {  
  return 0; # Invalid command.  
     }      }
     return 0; # Should not get here!!!      Debug("process_request: $userinput\n");
 }      
 #      #  
 #   ApplyEdit - Applies an edit command to a line in a configuration       #   The 'correct way' to add a command to lond is now to
 #               file.  It is the caller's responsiblity to validate the      #   write a sub to execute it and Add it to the command dispatch
 #               edit line.      #   hash via a call to register_handler..  The comments to that
 #   Parameters:      #   sub should give you enough to go on to show how to do this
 #      $directive - A single edit directive to apply.        #   along with the examples that are building up as this code
 #                   Edit directives are of the form:      #   is getting refactored.   Until all branches of the
 #                  append|newline      - Appends a new line to the file.      #   if/elseif monster below have been factored out into
 #                  replace|key|newline - Replaces the line with key value 'key'      #   separate procesor subs, if the dispatch hash is missing
 #                  delete|key          - Deletes the line with key value 'key'.      #   the command keyword, we will fall through to the remainder
 #      $editor   - A config file editor object that contains the      #   of the if/else chain below in order to keep this thing in 
 #                  file being edited.      #   working order throughout the transmogrification.
 #  
 sub ApplyEdit {  
     my $directive   = shift;  
     my $editor      = shift;  
   
     # 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($command eq "append") {      my ($command, $tail) = split(/:/, $userinput, 2);
  $editor->Append($p1);          # p1 - key p2 null.      chomp($command);
     } elsif ($command eq "replace") {      chomp($tail);
  $editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.      $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
     } elsif ($command eq "delete") {      $command =~ s/(\r)//; # And this too for parameterless commands.
  $editor->DeleteLine($p1);         # p1 - key p2 null.      if(!$tail) {
     } else {          # Should not get here!!!   $tail =""; # defined but blank.
  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.      &Debug("Command received: $command, encoded = $wasenc");
   
     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.      if(defined $Dispatcher{$command}) {
   
     #  Get my host file entry.   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;
    }
   
     my $ConfigLine    = $editor->Find($myHostName);   if($ok) {
     if(! (defined $ConfigLine)) {      Debug("Dispatching to handler $command $tail");
  die "AdjustOurHost - no entry for me in hosts file $myHostName";      my $keep_going = &$handler($command, $tail, $client);
     }      return $keep_going;
     # figure out my IP:   } else {
     #   Use the config line to get my hostname.      Debug("Refusing to dispatch because client did not match requirements");
     #   Use gethostbyname to translate that into an IP address.      Failure($client, "refused\n", $userinput);
     #      return 1;
     my ($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:  
   
     $editor->ReplaceLine($id, $newConfigLine);      }    
       
       print $client "unknown_cmd\n";
   # -------------------------------------------------------------------- complete
       Debug("process_request - returning 1");
       return 1;
 }  }
 #  #
 #   ReplaceConfigFile:  #   Decipher encoded traffic
 #              Replaces a configuration file with the contents of a  #  Parameters:
 #              configuration file editor object.  #     input      - Encoded data.
 #              This is done by:  #  Returns:
 #              - Copying the target file to <filename>.old  #     Decoded data or undef if encryption key was not yet negotiated.
 #              - Writing the new file to <filename>.tmp  #  Implicit input:
 #              - Moving <filename.tmp>  -> <filename>  #     cipher  - This global holds the negotiated encryption key.
 #              This laborious process ensures that the system is never without  
 #              a configuration file that's at least valid (even if the contents  
 #              may be dated).  
 #   Parameters:  
 #        filename   - Name of the file to modify... this is a full path.  
 #        editor     - Editor containing the file.  
 #  #
 sub ReplaceConfigFile {  sub decipher {
     my $filename  = shift;      my ($input)  = @_;
     my $editor    = shift;      my $output = '';
       
     CopyFile ($filename, $filename.".old");      
       if($cipher) {
     my $contents  = $editor->Get(); # Get the contents of the file.   my($enc, $enclength, $encinput) = split(/:/, $input);
    for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
     InstallFile($filename, $contents);      $output .= 
    $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
    }
    return substr($output, 0, $enclength);
       } else {
    return undef;
       }
 }  }
 #     
 #  #
 #   Called to edit a configuration table  file  #   Register a command processor.  This function is invoked to register a sub
   #   to process a request.  Once registered, the ProcessRequest sub can automatically
   #   dispatch requests to an appropriate sub, and do the top level validity checking
   #   as well:
   #    - Is the keyword recognized.
   #    - Is the proper client type attempting the request.
   #    - Is the request encrypted if it has to be.
 #   Parameters:  #   Parameters:
 #      request           - The entire command/request sent by lonc or lonManage  #    $request_name         - Name of the request being registered.
 #   Return:  #                           This is the command request that will match
 #      The reply to send to the client.  #                           against the hash keywords to lookup the information
   #                           associated with the dispatch information.
   #    $procedure           - Reference to a sub to call to process the request.
   #                           All subs get called as follows:
   #                             Procedure($cmd, $tail, $replyfd, $key)
   #                             $cmd    - the actual keyword that invoked us.
   #                             $tail   - the tail of the request that invoked us.
   #                             $replyfd- File descriptor connected to the client
   #    $must_encode          - True if the request must be encoded to be good.
   #    $client_ok            - True if it's ok for a client to request this.
   #    $manager_ok           - True if it's ok for a manager to request this.
   # Side effects:
   #      - On success, the Dispatcher hash has an entry added for the key $RequestName
   #      - On failure, the program will die as it's a bad internal bug to try to 
   #        register a duplicate command handler.
 #  #
 sub EditFile {  sub register_handler {
     my $request = shift;      my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok)   = @_;
   
     #  Split the command into it's pieces:  edit:filetype:script  
   
     my ($request, $filetype, $script) = split(/:/, $request,3); # : in script  
   
     #  Check the pre-coditions for success:      #  Don't allow duplication#
      
     if($request != "edit") { # Something is amiss afoot alack.      if (defined $Dispatcher{$request_name}) {
  return "error:edit request detected, but request != 'edit'\n";   die "Attempting to define a duplicate request handler for $request_name\n";
     }      }
     if( ($filetype ne "hosts")  &&      #   Build the client type mask:
  ($filetype ne "domain")) {      
  return "error:edit requested with invalid file specifier: $filetype \n";      my $client_type_mask = 0;
       if($client_ok) {
    $client_type_mask  |= $CLIENT_OK;
     }      }
       if($manager_ok) {
    $client_type_mask  |= $MANAGER_OK;
       }
      
       #  Enter the hash:
         
       my @entry = ($procedure, $must_encode, $client_type_mask);
      
       $Dispatcher{$request_name} = \@entry;
      
   }
   
     #   Split the edit script and check it's validity.  
   
     my @scriptlines = split(/\n/, $script);  # one line per element.  #------------------------------------------------------------------
     my $linecount   = scalar(@scriptlines);  
     for(my $i = 0; $i < $linecount; $i++) {  
  chomp($scriptlines[$i]);  
  if(!isValidEditCommand($scriptlines[$i])) {  
     return "error:edit with bad script line: '$scriptlines[$i]' \n";  
  }  
     }  
   
     #   Execute the edit operation.  
     #   - Create a config file editor for the appropriate file and   
     #   - execute each command in the script:  
     #  
     my $configfile = ConfigFileFromSelector($filetype);  
     if (!(defined $configfile)) {  
  return "refused\n";  
     }  
     my $editor = ConfigFileEdit->new($configfile);  
   
     for (my $i = 0; $i < $linecount; $i++) {  
  ApplyEdit($scriptlines[$i], $editor);  
     }  
     # If the file is the host file, ensure that our host is  
     # adjusted to have our ip:  
     #  
     if($filetype eq "host") {  
  AdjustOurHost($editor);  
     }  
     #  Finally replace the current file with our file.  
     #  
     ReplaceConfigFile($configfile, $editor);  
   
     return "ok\n";  
 }  
 #  #
 #  Convert an error return code from lcpasswd to a string value.  #  Convert an error return code from lcpasswd to a string value.
 #  #
Line 3421  sub catchexception { Line 4966  sub catchexception {
     $SIG{'QUIT'}='DEFAULT';      $SIG{'QUIT'}='DEFAULT';
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
     &status("Catching exception");      &status("Catching exception");
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color='red'>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "       ."ABNORMAL EXIT. Child $$ for server ".$perlvar{'lonHostID'}." died through "
      ."a crash with this error msg->[$error]</font>");       ."a crash with this error msg->[$error]</font>");
     &logthis('Famous last words: '.$status.' - '.$lastlog);      &logthis('Famous last words: '.$status.' - '.$lastlog);
     if ($client) { print $client "error: $error\n"; }      if ($client) { print $client "error: $error\n"; }
     $server->close();      $server->close();
     die($error);      die($error);
 }  }
   
 sub timeout {  sub timeout {
     &status("Handling Timeout");      &status("Handling Timeout");
     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
     &catchexception('Timeout');      &catchexception('Timeout');
 }  }
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
   
   
 $SIG{'QUIT'}=\&catchexception;  $SIG{'QUIT'}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   
Line 3449  undef $perlvarref; Line 4994  undef $perlvarref;
 # ----------------------------- Make sure this process is running from user=www  # ----------------------------- Make sure this process is running from user=www
 my $wwwid=getpwnam('www');  my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {  if ($wwwid!=$<) {
     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
     my $subj="LON: $currenthostid User ID mismatch";     my $subj="LON: $currenthostid User ID mismatch";
     system("echo 'User ID mismatch.  lond must be run as user www.' |\     system("echo 'User ID mismatch.  lond must be run as user www.' |\
  mailto $emailto -s '$subj' > /dev/null");   mailto $emailto -s '$subj' > /dev/null");
     exit 1;     exit 1;
 }  }
   
 # --------------------------------------------- Check if other instance running  # --------------------------------------------- Check if other instance running
Line 3461  if ($wwwid!=$<) { Line 5006  if ($wwwid!=$<) {
 my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";  my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
   
 if (-e $pidfile) {  if (-e $pidfile) {
     my $lfh=IO::File->new("$pidfile");     my $lfh=IO::File->new("$pidfile");
     my $pide=<$lfh>;     my $pide=<$lfh>;
     chomp($pide);     chomp($pide);
     if (kill 0 => $pide) { die "already running"; }     if (kill 0 => $pide) { die "already running"; }
 }  }
   
 # ------------------------------------------------------------- Read hosts file  # ------------------------------------------------------------- Read hosts file
Line 3477  $server = IO::Socket::INET->new(LocalPor Line 5022  $server = IO::Socket::INET->new(LocalPor
                                 Proto     => 'tcp',                                  Proto     => 'tcp',
                                 Reuse     => 1,                                  Reuse     => 1,
                                 Listen    => 10 )                                  Listen    => 10 )
     or die "making socket: $@\n";    or die "making socket: $@\n";
   
 # --------------------------------------------------------- Do global variables  # --------------------------------------------------------- Do global variables
   
 # 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{$pid});
    }
     }      }
     &status("Finished Handling child death");      &status("Finished Handling child death");
 }  }
Line 3507  sub HUNTSMAN {                      # si Line 5060  sub HUNTSMAN {                      # si
     &logthis("Free socket: ".shutdown($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 3517  sub HUPSMAN {                      # sig Line 5070  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 3525  sub HUPSMAN {                      # sig Line 5078  sub HUPSMAN {                      # sig
 }  }
   
 #  #
 #    Kill off hashes that describe the host table prior to re-reading it.  
 #    Hashes affected are:  
 #       %hostid, %hostdom %hostip  
 #  
 sub KillHostHashes {  
     foreach my $key (keys %hostid) {  
  delete $hostid{$key};  
     }  
     foreach my $key (keys %hostdom) {  
  delete $hostdom{$key};  
     }  
     foreach my $key (keys %hostip) {  
  delete $hostip{$key};  
     }  
 }  
 #  
 #   Read in the host table from file and distribute it into the various hashes:  
 #  
 #    - %hostid  -  Indexed by IP, the loncapa hostname.  
 #    - %hostdom -  Indexed by  loncapa hostname, the domain.  
 #    - %hostip  -  Indexed by hostid, the Ip address of the host.  
 sub ReadHostTable {  
   
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";  
       
     while (my $configline=<CONFIG>) {  
  my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);  
  chomp($ip); $ip=~s/\D+$//;  
  $hostid{$ip}=$id;  
  $hostdom{$id}=$domain;  
  $hostip{$id}=$ip;  
  if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }  
     }  
     close(CONFIG);  
 }  
 #  
 #  Reload the Apache daemon's state.  #  Reload the Apache daemon's state.
 #  This is done by invoking /home/httpd/perl/apachereload  #  This is done by invoking /home/httpd/perl/apachereload
 #  a setuid perl script that can be root for us to do this job.  #  a setuid perl script that can be root for us to do this job.
Line 3591  sub UpdateHosts { Line 5108  sub UpdateHosts {
     #  either dropped or changed hosts.  Note that the re-read of the table      #  either dropped or changed hosts.  Note that the re-read of the table
     #  will take care of new and changed hosts as connections come into being.      #  will take care of new and changed hosts as connections come into being.
   
       &Apache::lonnet::reset_hosts_info();
   
     KillHostHashes;      foreach my $child (keys(%children)) {
     ReadHostTable;  
   
     foreach my $child (keys %children) {  
  my $childip = $children{$child};   my $childip = $children{$child};
  if(!$hostid{$childip}) {   if ($childip ne '127.0.0.1'
       && !defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
     logthis('<font color="blue"> UpdateHosts killing child '      logthis('<font color="blue"> UpdateHosts killing child '
     ." $child for ip $childip </font>");      ." $child for ip $childip </font>");
     kill('INT', $child);      kill('INT', $child);
Line 3618  sub checkchildren { Line 5134  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';      $SIG{__DIE__} = 'DEFAULT';
     &status("Checking on the children (waiting for reports)");      &status("Checking on the children (waiting for reports)");
     foreach (sort keys %children) {      foreach (sort keys %children) {
         unless (-e "$docdir/lon-status/londchld/$_.txt") {          unless (-e "$docdir/lon-status/londchld/$_.txt") {
     eval {            eval {
  alarm(300);              alarm(300);
  &logthis('Child '.$_.' did not respond');      &logthis('Child '.$_.' did not respond');
  kill 9 => $_;      kill 9 => $_;
  #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";      #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
  #$subj="LON: $currenthostid killed lond process $_";      #$subj="LON: $currenthostid killed lond process $_";
  #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 $execdir/logs/lond.log.$_`;
  alarm(0);      delete($children{$_});
     }      alarm(0);
     }
         }          }
     }      }
     $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 3676  sub Debug { Line 5196  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 3721  sub logstatus { Line 5234  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";
    flock(LOG,LOCK_UN);
    close(LOG);
     }      }
     ResetStatistics;  
     &status("Finished logging");      &status("Finished logging");
      
 }  }
   
 sub initnewstatus {  sub initnewstatus {
Line 3755  sub status { Line 5269  sub status {
     my $what=shift;      my $what=shift;
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $status = "lond: $what $local ";      $status=$local.': '.$what;
     if($Transactions) {      $0='lond: '.$what.' '.$local;
  $status .= " Transactions: $Transactions Failed; $Failures";  
     }  
     $0=$status;  
 }  
   
 # -------------------------------------------------------- Escape Special Chars  
   
 sub escape {  
     my $str=shift;  
     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;  
     return $str;  
 }  
   
 # ----------------------------------------------------- Un-Escape Special Chars  
   
 sub unescape {  
     my $str=shift;  
     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;  
     return $str;  
 }  
   
 # ----------------------------------------------------------- Send USR1 to lonc  
   
 sub reconlonc {  
     my $peerfile=shift;  
     &logthis("Trying to reconnect for $peerfile");  
     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";  
     if (my $fh=IO::File->new("$loncfile")) {  
  my $loncpid=<$fh>;  
         chomp($loncpid);  
         if (kill 0 => $loncpid) {  
     &logthis("lonc at pid $loncpid responding, sending USR1");  
             kill USR1 => $loncpid;  
         } else {  
     &logthis("<font color=red>CRITICAL: "  
      ."lonc at pid $loncpid not responding, giving up</font>");  
         }  
     } else {  
  &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');  
     }  
 }  
   
 # -------------------------------------------------- Non-critical communication  
   
 sub subreply {  
     my ($cmd,$server)=@_;  
     my $peerfile="$perlvar{'lonSockDir'}/$server";  
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",  
                                       Type    => SOCK_STREAM,  
                                       Timeout => 10)  
  or return "con_lost";  
     print $sclient "$cmd\n";  
     my $answer=<$sclient>;  
     chomp($answer);  
     if (!$answer) { $answer="con_lost"; }  
     return $answer;  
 }  
   
 sub reply {  
     my ($cmd,$server)=@_;  
     my $answer;  
     if ($server ne $currenthostid) {   
  $answer=subreply($cmd,$server);  
  if ($answer eq 'con_lost') {  
     $answer=subreply("ping",$server);  
     if ($answer ne $server) {  
  &logthis("sub reply: answer != server answer is $answer, server is $server");  
  &reconlonc("$perlvar{'lonSockDir'}/$server");  
     }  
     $answer=subreply($cmd,$server);  
  }  
     } else {  
  $answer='self_reply';  
     }   
     return $answer;  
 }  }
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
   
 sub sqlreply {  sub sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $answer=subsqlreply($cmd);      my $answer=&sub_sql_reply($cmd);
     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }      if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
     return $answer;      return $answer;
 }  }
   
 sub subsqlreply {  sub sub_sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $unixsock="mysqlsock";      my $unixsock="mysqlsock";
     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";      my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
     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 $sclient "$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 3899  my $execdir=$perlvar{'lonDaemons'}; Line 5326  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 3914  $SIG{USR1} = \&checkchildren; Line 5341  $SIG{USR1} = \&checkchildren;
 $SIG{USR2} = \&UpdateHosts;  $SIG{USR2} = \&UpdateHosts;
   
 #  Read the host hashes:  #  Read the host hashes:
   &Apache::lonnet::load_hosts_tab();
   
 ReadHostTable;  my $dist=`$perlvar{'lonDaemons'}/distprobe`;
   
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated  #   Accept connections.  When a connection comes in, it is validated
Line 3933  while (1) { Line 5360  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 3943  sub make_new_child { Line 5371  sub make_new_child {
     $sigset = POSIX::SigSet->new(SIGINT);      $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset)      sigprocmask(SIG_BLOCK, $sigset)
         or die "Can't block SIGINT for fork: $!\n";          or die "Can't block SIGINT for fork: $!\n";
       
     die "fork: $!" unless defined ($pid = fork);      die "fork: $!" unless defined ($pid = fork);
   
     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of      $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
Line 3954  sub make_new_child { Line 5382  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 3979  sub make_new_child { Line 5417  sub make_new_child {
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
   
   #        my $tmpsnum=0;            # Now global
   #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
         &Authen::Krb5::init_ets();   unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||  
    ($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
       &Authen::Krb5::init_ets();
    }
   
  &status('Accepted connection');   &status('Accepted connection');
 # =============================================================================  # =============================================================================
             # do something with the connection              # do something with the connection
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
  # see if we know client and check for spoof IP by challenge   # see if we know client and 'check' for spoof IP by ineffective challenge
   
  ReadManagerTable; # May also be a manager!!   my $outsideip=$clientip;
    if ($clientip eq '127.0.0.1') {
  my $clientrec=($hostid{$clientip}     ne undef);      $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
  my $ismanager=($managers{$clientip}    ne undef);   }
   
    my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
    my $ismanager=($managers{$outsideip}    ne undef);
  $clientname  = "[unknonwn]";   $clientname  = "[unknonwn]";
  if($clientrec) { # Establish client type.   if($clientrec) { # Establish client type.
     $ConnectionType = "client";      $ConnectionType = "client";
     $clientname = $hostid{$clientip};      $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
     if($ismanager) {      if($ismanager) {
  $ConnectionType = "both";   $ConnectionType = "both";
     }      }
  } else {   } else {
     $ConnectionType = "manager";      $ConnectionType = "manager";
     $clientname = $managers{$clientip};      $clientname = $managers{$outsideip};
  }   }
  my $clientok;   my $clientok;
   
  if ($clientrec || $ismanager) {   if ($clientrec || $ismanager) {
     &status("Waiting for init from $clientip $clientname");      &status("Waiting for init from $clientip $clientname");
     &logthis('<font color="yellow">INFO: Connection, '.      &logthis('<font color="yellow">INFO: Connection, '.
      $clientip.       $clientip.
      " ($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)");    #
  $remotereq=<$client>;   my ($i, $inittype) = split(/:/, $remotereq);
  $remotereq=~s/\W//g;  
  if ($challenge eq $remotereq) {   # If the connection type is ssl, but I didn't get my
     $clientok=1;   # certificate files yet, then I'll drop  back to 
     print $client "ok\n";   # insecure (if allowed).
   
    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("<font color=blue>WARNING: $clientip did not reply challenge</font>");      my $ok = InsecureConnection($client);
     &status('No challenge reply '.$clientip);      if($ok) {
    $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("<font color=blue>WARNING: "   &logthis(
    "<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("<font color=blue>WARNING: Unknown client $clientip</font>");      &logthis(
        "<font color='blue'>WARNING: Unknown client $clientip</font>");
     &status('Hung up on '.$clientip);      &status('Hung up on '.$clientip);
  }   }
    
  if ($clientok) {   if ($clientok) {
 # ---------------- New known client connecting, could mean machine online again  # ---------------- New known client connecting, could mean machine online again
           if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip 
     foreach my $id (keys(%hostip)) {   && $clientip ne '127.0.0.1') {
  if ($hostip{$id} ne $clientip ||   &Apache::lonnet::reconlonc($clientname);
     $hostip{$currenthostid} eq $clientip) {  
     # no need to try to do recon's to myself  
     next;  
  }  
  &reconlonc("$perlvar{'lonSockDir'}/$id");  
     }      }
     &logthis("<font color=green>Established connection: $clientname</font>");      &logthis("<font color='green'>Established connection: $clientname</font>");
     &status('Will listen to '.$clientname);      &status('Will listen to '.$clientname);
   
     ResetStatistics();  
   
 # ------------------------------------------------------------ Process requests  # ------------------------------------------------------------ Process requests
     my $KeepGoing = 1;      my $keep_going = 1;
     while ((my $userinput=GetRequest) && $KeepGoing) {      my $user_input;
  $KeepGoing = ProcessRequest($userinput);      while(($user_input = get_request) && $keep_going) {
 # -------------------------------------------------------------------- complete   alarm(120);
    Debug("Main: Got $user_input\n");
  &status('Listening to '.$clientname);   $keep_going = &process_request($user_input);
    alarm(0);
    &status('Listening to '.$clientname." ($keymode)");   
     }      }
   
 # --------------------------------------------- client unknown or fishy, refuse  # --------------------------------------------- client unknown or fishy, refuse
  } else {   }  else {
     print $client "refused\n";      print $client "refused\n";
     $client->close();      $client->close();
     &logthis("<font color=blue>WARNING: "      &logthis("<font color='blue'>WARNING: "
      ."Rejected client $clientip, closing connection</font>");       ."Rejected client $clientip, closing connection</font>");
  }   }
     }                   }            
           
 # =============================================================================  # =============================================================================
           
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color='red'>CRITICAL: "
      ."Disconnect from $clientip ($clientname)</font>");           ."Disconnect from $clientip ($clientname)</font>");    
           
           
Line 4082  sub make_new_child { Line 5586  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 4095  sub make_new_child { Line 5629  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 $request = shift;      my ($request, $domain, $user, $authtype) = @_;
     my $domain  = shift;  
     my $user    = shift;      &Debug("manage_permissions: $request $domain $user $authtype");
     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.  #  Return the full path of a user password file, whether it exists or not.
 # Parameters:  # Parameters:
Line 4119  sub ManagePermissions { Line 5653  sub ManagePermissions {
 # Returns:  # Returns:
 #    Full passwd path:  #    Full passwd path:
 #  #
 sub PasswordPath {  sub password_path {
     my $domain = shift;      my ($domain, $user) = @_;
     my $user   = shift;      return &propath($domain, $user).'/passwd';
   
     my $path   = &propath($domain, $user);  
     my $path  .= "/passwd";  
   
     return $path;  
 }  }
   
 #   Password Filename  #   Password Filename
Line 4139  sub PasswordPath { Line 5668  sub PasswordPath {
 #   - If the password file exists returns its path.  #   - If the password file exists returns its path.
 #   - If the password file does not exist, returns undefined.  #   - If the password file does not exist, returns undefined.
 #  #
 sub PasswordFilename {  sub password_filename {
     my $domain    = shift;      my ($domain, $user) = @_;
     my $user      = shift;  
   
     my $path  = PasswordPath($domain, $user);      Debug ("PasswordFilename called: dom = $domain user = $user");
   
       my $path  = &password_path($domain, $user);
       Debug("PasswordFilename got path: $path");
     if(-e $path) {      if(-e $path) {
  return $path;   return $path;
     } else {      } else {
Line 4162  sub PasswordFilename { Line 5692  sub PasswordFilename {
 #   0    - Failed.  #   0    - Failed.
 #   1    - Success.  #   1    - Success.
 #  #
 sub RewritePwFile {  sub rewrite_password_file {
     my $domain   = shift;      my ($domain, $user, $contents) = @_;
     my $user     = shift;  
     my $contents = shift;  
   
     my $file = PasswordFilename($domain, $user);      my $file = &password_filename($domain, $user);
     if (defined $file) {      if (defined $file) {
  my $pf = IO::File->new(">$file");   my $pf = IO::File->new(">$file");
  if($pf) {   if($pf) {
Line 4181  sub RewritePwFile { Line 5709  sub RewritePwFile {
     }      }
   
 }  }
   
 #  #
 #   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 $user   = shift;  
       my ($domain, $user)  = @_;
     Debug("GetAuthType( $domain, $user ) \n");  
     my $passwdfile = PasswordFilename($domain, $user);      Debug("get_auth_type( $domain, $user ) \n");
     if( defined $passwdfile ) {      my $proname    = &propath($domain, $user); 
       my $passwdfile = "$proname/passwd";
       if( -e $passwdfile ) {
  my $pf = IO::File->new($passwdfile);   my $pf = IO::File->new($passwdfile);
  my $realpassword = <$pf>;   my $realpassword = <$pf>;
  chomp($realpassword);   chomp($realpassword);
  Debug("Password info = $realpassword\n");   Debug("Password info = $realpassword\n");
  return $realpassword;   my ($authtype, $contentpwd) = split(/:/, $realpassword);
    Debug("Authtype = $authtype, content = $contentpwd\n");
    return "$authtype:$contentpwd";     
     } else {      } 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();
    $credentials->initialize(&Authen::Krb5::parse_name($user.'@'
                                                                    .$contentpwd));
    my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
    $krbserver,
    $password,
    $credentials);
    $validated = ($krbreturn == 1);
    if (!$validated) {
       &logthis('krb5: '.$user.', '.$contentpwd.', '.
        &Authen::Krb5::error());
    }
       } else {
    $validated = 0;
       }
    } elsif ($howpwd eq "localauth") { 
       #  Authenticate via installation specific authentcation method:
       $validated = &localauth::localauth($user, 
          $password, 
          $contentpwd,
          $domain);
       if ($validated < 0) {
    &logthis("localauth for $contentpwd $user:$domain returned a $validated");
    $validated = 0;
       }
    } else { # Unrecognized auth is also bad.
       $validated = 0;
    }
       } else {
    $validated = 0;
       }
       #
       #  $validated has the correct stat of the authentication:
       #
   
       unless ($validated != -3.14159) {
    #  I >really really< want to know if this happens.
    #  since it indicates that user authentication is badly
    #  broken in some code path.
           #
    die "ValidateUser - failed to set the value of validated $domain, $user $password";
       }
       return $validated;
   }
   
   
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
     my $found=0;      my $found=0;
     my $expr='^'.$hostid.':'.$ip.':';      my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
     $expr =~ s/\./\\\./g;  
     my $sh;      my $sh;
     if ($sh=IO::File->new("$fname.subscription")) {      if ($sh=IO::File->new("$fname.subscription")) {
  while (my $subline=<$sh>) {   while (my $subline=<$sh>) {
Line 4224  sub addline { Line 5891  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 4267  sub chatadd { Line 5946  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 4307  sub currentversion { Line 6006  sub currentversion {
     my $version=-1;      my $version=-1;
     my $ulsdir='';      my $ulsdir='';
     if ($fname=~/^(.+)\/[^\/]+$/) {      if ($fname=~/^(.+)\/[^\/]+$/) {
  $ulsdir=$1;         $ulsdir=$1;
     }      }
     my ($fnamere1,$fnamere2);      my ($fnamere1,$fnamere2);
     # remove version if already specified      # remove version if already specified
Line 4351  sub thisversion { Line 6050  sub thisversion {
 sub subscribe {  sub subscribe {
     my ($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 4364  sub subscribe { Line 6063  sub subscribe {
                     symlink($root.'.'.$extension,                      symlink($root.'.'.$extension,
                             $root.'.'.$currentversion.'.'.$extension);                              $root.'.'.$currentversion.'.'.$extension);
                     unless ($extension=~/\.meta$/) {                      unless ($extension=~/\.meta$/) {
  symlink($root.'.'.$extension.'.meta',                         symlink($root.'.'.$extension.'.meta',
  $root.'.'.$currentversion.'.'.$extension.'.meta');                              $root.'.'.$currentversion.'.'.$extension.'.meta');
     }      }
                 }                  }
             }              }
Line 4384  sub subscribe { Line 6083  sub subscribe {
                 # the metadata                  # the metadata
  unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }   unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
  $fname=~s/\/home\/httpd\/html\/res/raw/;   $fname=~s/\/home\/httpd\/html\/res/raw/;
  $fname="http://$thisserver/".$fname;   $fname="http://".&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
  $result="$fname\n";   $result="$fname\n";
     }      }
  } else {   } else {
Line 4395  sub subscribe { Line 6094  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,$passfilename)=@_;
Line 4402  sub make_passwd_file { Line 6130  sub make_passwd_file {
     if ($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 4411  sub make_passwd_file { Line 6143  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 4428  sub make_passwd_file { Line 6180  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 4447  sub make_passwd_file { Line 6223  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 (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'}) 
  $currenthostid=$hostid;   eq &Apache::lonnet::get_host_ip($hostid)) {
  $currentdomainid=$hostdom{$hostid};   $currenthostid  =$hostid;
    $currentdomainid=&Apache::lonnet::host_domain($hostid);
  &logthis("Setting hostid to $hostid, and domain to $currentdomainid");   &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {      } else {
  &logthis("Requested host id $hostid not an alias of ".   &logthis("Requested host id $hostid not an alias of ".
Line 4468  sub version { Line 6255  sub version {
     $remoteVERSION=(split(/:/,$userinput))[1];      $remoteVERSION=(split(/:/,$userinput))[1];
     return "version:$VERSION";      return "version:$VERSION";
 }  }
 ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<  
 #There is a copy of this in lonnet.pm  
 #   Can we hoist these lil' things out into common places?  
 #  
 sub userload {  
     my $numusers=0;  
     {  
  opendir(LONIDS,$perlvar{'lonIDsDir'});  
  my $filename;  
  my $curtime=time;  
  while ($filename=readdir(LONIDS)) {  
     if ($filename eq '.' || $filename eq '..') {next;}  
     my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];  
     if ($curtime-$mtime < 1800) { $numusers++; }  
  }  
  closedir(LONIDS);  
     }  
     my $userloadpercent=0;  
     my $maxuserload=$perlvar{'lonUserLoadLim'};  
     if ($maxuserload) {  
  $userloadpercent=100*$numusers/$maxuserload;  
     }  
     $userloadpercent=sprintf("%.2f",$userloadpercent);  
     return $userloadpercent;  
 }  
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  # ----------------------------------- POD (plain old documentation, CPAN style)
   
Line 4701  Place in B<logs/lond.log> Line 6464  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 4809  to the client, and the connection is clo Line 6572  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.1.178.2.8  
changed lines
  Added in v.1.381

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