Diff for /loncom/lond between versions 1.165.2.4 and 1.337

version 1.165.2.4, 2004/04/08 20:11:12 version 1.337, 2006/08/25 17:22:59
Line 10 Line 10
 #  #
 # LON-CAPA is free software; you can redistribute it and/or modify  # LON-CAPA is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by  # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2 of the License, or  # the Free Software Foundation; either version 2 of the License, or 
 # (at your option) any later version.  # (at your option) any later version.
 #  #
 # LON-CAPA is distributed in the hope that it will be useful,  # LON-CAPA is distributed in the hope that it will be useful,
Line 31 Line 31
   
 use strict;  use strict;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
   use LONCAPA;
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
   
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
 #use Apache::File;  #use Apache::File;
 use Symbol;  
 use POSIX;  use POSIX;
 use Crypt::IDEA;  use Crypt::IDEA;
 use LWP::UserAgent();  use LWP::UserAgent();
Line 45  use Authen::Krb4; Line 45  use Authen::Krb4;
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use localauth;  use localauth;
   use localenroll;
   use localstudentphoto;
 use File::Copy;  use File::Copy;
   use File::Find;
   use LONCAPA::ConfigFileEdit;
   use LONCAPA::lonlocal;
   use LONCAPA::lonssl;
   use Fcntl qw(:flock);
   
 my $DEBUG = 0;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
Line 54  my $lastlog=''; Line 61  my $lastlog='';
   
 my $VERSION='$Revision$'; #' stupid emacs  my $VERSION='$Revision$'; #' stupid emacs
 my $remoteVERSION;  my $remoteVERSION;
 my $currenthostid;  my $currenthostid="default";
 my $currentdomainid;  my $currentdomainid;
   
 my $client;  my $client;
 my $clientip;  my $clientip; # IP address of client.
 my $clientname;  my $clientname; # LonCAPA name of client.
   
 my $server;  my $server;
 my $thisserver;  my $thisserver; # DNS of us.
   
   my $keymode;
   
   my $cipher; # Cipher key negotiated with client
   my $tmpsnum = 0; # Id of tmpputs.
   
 #   # 
 #   Connection type is:  #   Connection type is:
Line 73  my $thisserver; Line 85  my $thisserver;
   
 my $ConnectionType;  my $ConnectionType;
   
 my %hostid;  my %hostid; # ID's for hosts in cluster by ip.
 my %hostdom;  my %hostdom; # LonCAPA domain for hosts in cluster.
 my %hostip;  my %hostname; # DNSname -> ID's mapping.
   my %hostip; # IPs for hosts in cluster.
   my %hostdns; # ID's of hosts looked up by DNS name.
   
 my %managers; # Ip -> manager names  my %managers; # Ip -> manager names
   
 my %perlvar; # Will have the apache conf defined perl vars.  my %perlvar; # Will have the apache conf defined perl vars.
   
 #  #
   #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
   #    Each element of the hash contains a reference to an array that contains:
   #          A reference to a sub that executes the request corresponding to the keyword.
   #          A flag that is true if the request must be encoded to be acceptable.
   #          A mask with bits as follows:
   #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
   #                      MANAGER_OK   - Set when the function is allowed to manager clients.
   #
   my $CLIENT_OK  = 1;
   my $MANAGER_OK = 2;
   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 119  my @adderrors    = ("ok", Line 149  my @adderrors    = ("ok",
     "lcuseradd Password mismatch");      "lcuseradd Password mismatch");
   
   
   
   #
   #   Statistics that are maintained and dislayed in the status line.
   #
   my $Transactions = 0; # Number of attempted transactions.
   my $Failures     = 0; # Number of transcations failed.
   
   #   ResetStatistics: 
   #      Resets the statistics counters:
   #
   sub ResetStatistics {
       $Transactions = 0;
       $Failures     = 0;
   }
   
   #------------------------------------------------------------------------
   #
   #   LocalConnection
   #     Completes the formation of a locally authenticated connection.
   #     This function will ensure that the 'remote' client is really the
   #     local host.  If not, the connection is closed, and the function fails.
   #     If so, initcmd is parsed for the name of a file containing the
   #     IDEA session key.  The fie is opened, read, deleted and the session
   #     key returned to the caller.
   #
   # Parameters:
   #   $Socket      - Socket open on client.
   #   $initcmd     - The full text of the init command.
   #
   # Implicit inputs:
   #    $thisserver - Our DNS name.
   #
   # Returns:
   #     IDEA session key on success.
   #     undef on failure.
   #
   sub LocalConnection {
       my ($Socket, $initcmd) = @_;
       Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
       if($clientip ne "127.0.0.1") {
    &logthis('<font color="red"> LocalConnection rejecting non local: '
    ."$clientip ne $thisserver </font>");
    close $Socket;
    return undef;
       }  else {
    chomp($initcmd); # Get rid of \n in filename.
    my ($init, $type, $name) = split(/:/, $initcmd);
    Debug(" Init command: $init $type $name ");
   
    # Require that $init = init, and $type = local:  Otherwise
    # the caller is insane:
   
    if(($init ne "init") && ($type ne "local")) {
       &logthis('<font color = "red"> LocalConnection: caller is insane! '
        ."init = $init, and type = $type </font>");
       close($Socket);;
       return undef;
   
    }
    #  Now get the key filename:
   
    my $IDEAKey = lonlocal::ReadKeyFile($name);
    return $IDEAKey;
       }
   }
   #------------------------------------------------------------------------------
   #
   #  SSLConnection
   #   Completes the formation of an ssh authenticated connection. The
   #   socket is promoted to an ssl socket.  If this promotion and the associated
   #   certificate exchange are successful, the IDEA key is generated and sent
   #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
   #   the caller after the SSL tunnel is torn down.
   #
   # Parameters:
   #   Name              Type             Purpose
   #   $Socket          IO::Socket::INET  Plaintext socket.
   #
   # Returns:
   #    IDEA key on success.
   #    undef on failure.
   #
   sub SSLConnection {
       my $Socket   = shift;
   
       Debug("SSLConnection: ");
       my $KeyFile         = lonssl::KeyFile();
       if(!$KeyFile) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get key file $err </font>");
    return undef;
       }
       my ($CACertificate,
    $Certificate) = lonssl::CertificateFile();
   
   
       # If any of the key, certificate or certificate authority 
       # certificate filenames are not defined, this can't work.
   
       if((!$Certificate) || (!$CACertificate)) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get certificates: $err </font>");
   
    return undef;
       }
       Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
   
       # Indicate to our peer that we can procede with
       # a transition to ssl authentication:
   
       print $Socket "ok:ssl\n";
   
       Debug("Approving promotion -> ssl");
       #  And do so:
   
       my $SSLSocket = lonssl::PromoteServerSocket($Socket,
    $CACertificate,
    $Certificate,
    $KeyFile);
       if(! ($SSLSocket) ) { # SSL socket promotion failed.
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL "
    ."SSL Socket promotion failed: $err </font>");
    return undef;
       }
       Debug("SSL Promotion successful");
   
       # 
       #  The only thing we'll use the socket for is to send the IDEA key
       #  to the peer:
   
       my $Key = lonlocal::CreateCipherKey();
       print $SSLSocket "$Key\n";
   
       lonssl::Close($SSLSocket); 
   
       Debug("Key exchange complete: $Key");
   
       return $Key;
   }
   #
   #     InsecureConnection: 
   #        If insecure connections are allowd,
   #        exchange a challenge with the client to 'validate' the
   #        client (not really, but that's the protocol):
   #        We produce a challenge string that's sent to the client.
   #        The client must then echo the challenge verbatim to us.
   #
   #  Parameter:
   #      Socket      - Socket open on the client.
   #  Returns:
   #      1           - success.
   #      0           - failure (e.g.mismatch or insecure not allowed).
   #
   sub InsecureConnection {
       my $Socket  =  shift;
   
       #   Don't even start if insecure connections are not allowed.
   
       if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
    return 0;
       }
   
       #   Fabricate a challenge string and send it..
   
       my $challenge = "$$".time; # pid + time.
       print $Socket "$challenge\n";
       &status("Waiting for challenge reply");
   
       my $answer = <$Socket>;
       $answer    =~s/\W//g;
       if($challenge eq $answer) {
    return 1;
       } else {
    logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
    &status("No challenge reqply");
    return 0;
       }
       
   
   }
 #  #
   #   Safely execute a command (as long as it's not a shel command and doesn
   #   not require/rely on shell escapes.   The function operates by doing a
   #   a pipe based fork and capturing stdout and stderr  from the pipe.
   #
   # Formal Parameters:
   #     $line                    - A line of text to be executed as a command.
   # Returns:
   #     The output from that command.  If the output is multiline the caller
   #     must know how to split up the output.
   #
   #
   sub execute_command {
       my ($line)    = @_;
       my @words     = split(/\s/, $line); # Bust the command up into words.
       my $output    = "";
   
       my $pid = open(CHILD, "-|");
       
       if($pid) { # Parent process
    Debug("In parent process for execute_command");
    my @data = <CHILD>; # Read the child's outupt...
    close CHILD;
    foreach my $output_line (@data) {
       Debug("Adding $output_line");
       $output .= $output_line; # Presumably has a \n on it.
    }
   
       } else { # Child process
    close (STDERR);
    open  (STDERR, ">&STDOUT");# Combine stderr, and stdout...
    exec(@words); # won't return.
       }
       return $output;
   }
   
   
 #   GetCertificate: Given a transaction that requires a certificate,  #   GetCertificate: Given a transaction that requires a certificate,
 #   this function will extract the certificate from the transaction  #   this function will extract the certificate from the transaction
 #   request.  Note that at this point, the only concept of a certificate  #   request.  Note that at this point, the only concept of a certificate
Line 157  sub isClient { Line 406  sub isClient {
 #                     - This allows dynamic changes to the manager table  #                     - This allows dynamic changes to the manager table
 #                       without the need to signal to the lond.  #                       without the need to signal to the lond.
 #  #
   
 sub ReadManagerTable {  sub ReadManagerTable {
   
     #   Clean out the old table first..      #   Clean out the old table first..
   
     foreach my $key (keys %managers) {     foreach my $key (keys %managers) {
  delete $managers{$key};        delete $managers{$key};
     }     }
   
     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
     if (!open (MANAGERS, $tablename)) {     if (!open (MANAGERS, $tablename)) {
  logthis('<font color="red">No manager table.  Nobody can manage!!</font>');        logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
  return;        return;
     }     }
     while(my $host = <MANAGERS>) {     while(my $host = <MANAGERS>) {
  chomp($host);        chomp($host);
  if (!defined $hostip{$host}) { # This is a non cluster member        if ($host =~ "^#") {                  # Comment line.
            next;
         }
         if (!defined $hostip{$host}) { # This is a non cluster member
     #  The entry is of the form:      #  The entry is of the form:
     #    cluname:hostname      #    cluname:hostname
     #  cluname - A 'cluster hostname' is needed in order to negotiate      #  cluname - A 'cluster hostname' is needed in order to negotiate
     #            the host key.      #            the host key.
     #  hostname- The dns name of the host.      #  hostname- The dns name of the host.
     #      #
                 my($cluname, $dnsname) = split(/:/, $host);
     my($cluname, $dnsname) = split(/:/, $host);            
     open(MGRPIPE, "/usr/bin/host $dnsname |") || die "Can't make host pipeline";            my $ip = gethostbyname($dnsname);
     my $dnsinfo = <MGRPIPE>;            if(defined($ip)) {                 # bad names don't deserve entry.
     chomp $dnsinfo;              my $hostip = inet_ntoa($ip);
     close MGRPIPE;              $managers{$hostip} = $cluname;
     my($jname, $jhas, $jaddress, $hostip) = split(/ /, $dnsinfo);              logthis('<font color="green"> registering manager '.
     $managers{$hostip} = $cluname;                      "$dnsname as $cluname with $hostip </font>\n");
  } else {           }
     $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber        } else {
  }           logthis('<font color="green"> existing host'." $host</font>\n");
     }           $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
         }
      }
 }  }
   
 #  #
Line 219  sub ValidManager { Line 471  sub ValidManager {
 #     1   - Success.  #     1   - Success.
 #  #
 sub CopyFile {  sub CopyFile {
     my $oldfile = shift;  
     my $newfile = shift;  
   
     #  The file must exist:  
   
     if(-e $oldfile) {      my ($oldfile, $newfile) = @_;
   
  # Read the old file.      if (! copy($oldfile,$newfile)) {
           return 0;
  my $oldfh = IO::File->new("< $oldfile");  
  if(!$oldfh) {  
     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;  
  $newfh->close;  
   
  chmod(0660, $newfile);  
   
  return 1;  
       
     } else {  
  return 0;  
     }      }
       chmod(0660, $newfile);
       return 1;
 }  }
 #  #
 #  Host files are passed out with externally visible host IPs.  #  Host files are passed out with externally visible host IPs.
Line 279  sub AdjustHostContents { Line 503  sub AdjustHostContents {
     my $adjusted;      my $adjusted;
     my $me        = $perlvar{'lonHostID'};      my $me        = $perlvar{'lonHostID'};
   
     foreach my $line (split(/\n/,$contents)) {   foreach my $line (split(/\n/,$contents)) {
  if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {   if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
     chomp($line);      chomp($line);
     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);      my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
     if ($id eq $me) {      if ($id eq $me) {
  open(PIPE, " /usr/bin/host $name |") || die "Cant' make host pipeline";            my $ip = gethostbyname($name);
  my $hostinfo = <PIPE>;            my $ipnew = inet_ntoa($ip);
  close PIPE;           $ip = $ipnew;
   
  my ($hostname, $has, $address, $ipnew) = split(/ /,$hostinfo);  
  &logthis('<font color="green">'.  
  "hostname = $hostname me = $me, name = $name   actual ip = $ipnew </font>");  
   
  if ($hostname eq $name) { # Lookup succeeded..  
     &logthis('<font color="green"> look up ok <font>');  
     $ip = $ipnew;  
  } else {  
     &logthis('<font color="green"> Lookup failed: '  
      .$hostname." ne $name </font>");  
  }  
  #  Reconstruct the host line and append to adjusted:   #  Reconstruct the host line and append to adjusted:
   
  my $newline = "$id:$domain:$role:$name:$ip";     my $newline = "$id:$domain:$role:$name:$ip";
  if($maxcon ne "") { # Not all hosts have loncnew tuning params     if($maxcon ne "") { # Not all hosts have loncnew tuning params
     $newline .= ":$maxcon:$idleto:$mincon";       $newline .= ":$maxcon:$idleto:$mincon";
  }     }
  $adjusted .= $newline."\n";     $adjusted .= $newline."\n";
   
     } else { # Not me, pass unmodified.        } else { # Not me, pass unmodified.
  $adjusted .= $line."\n";     $adjusted .= $line."\n";
     }        }
  } else {                  # Blank or comment never re-written.   } else {                  # Blank or comment never re-written.
     $adjusted .= $line."\n"; # Pass blanks and comments as is.      $adjusted .= $line."\n"; # Pass blanks and comments as is.
  }   }
     }   }
     return $adjusted;   return $adjusted;
 }  }
 #  #
 #   InstallFile: Called to install an administrative file:  #   InstallFile: Called to install an administrative file:
Line 332  sub AdjustHostContents { Line 544  sub AdjustHostContents {
 #      0       - failure and $! has an errno.  #      0       - failure and $! has an errno.
 #  #
 sub InstallFile {  sub InstallFile {
     my $Filename = shift;  
     my $Contents = shift;      my ($Filename, $Contents) = @_;
     my $TempFile = $Filename.".tmp";      my $TempFile = $Filename.".tmp";
   
     #  Open the file for write:      #  Open the file for write:
Line 357  sub InstallFile { Line 569  sub InstallFile {
     return 1;      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:
   #      Full path to the file or undef if the selector is invalid.
   #
   sub ConfigFileFromSelector {
       my $selector   = shift;
       my $tablefile;
   
       my $tabledir = $perlvar{'lonTabDir'}.'/';
       if ($selector eq "hosts") {
    $tablefile = $tabledir."hosts.tab";
       } elsif ($selector eq "domain") {
    $tablefile = $tabledir."domain.tab";
       } else {
    return undef;
       }
       return $tablefile;
   
   }
 #  #
 #   PushFile:  Called to do an administrative push of a file.  #   PushFile:  Called to do an administrative push of a file.
 #              - Ensure the file being pushed is one we support.  #              - Ensure the file being pushed is one we support.
Line 386  sub PushFile { Line 624  sub PushFile {
     # part of some elaborate spoof that managed somehow to authenticate.      # part of some elaborate spoof that managed somehow to authenticate.
     #      #
   
     my $tablefile = $perlvar{'lonTabDir'}.'/'; # need to precede with dir.  
     if ($filename eq "host") {      my $tablefile = ConfigFileFromSelector($filename);
  $tablefile .= "hosts.tab";      if(! (defined $tablefile)) {
     } elsif ($filename eq "domain") {  
  $tablefile .= "domain.tab";  
     } else {  
  return "refused";   return "refused";
     }      }
     #      #
Line 424  sub PushFile { Line 659  sub PushFile {
  &logthis('<font color="red"> Pushfile: unable to install '   &logthis('<font color="red"> Pushfile: unable to install '
  .$tablefile." $! </font>");   .$tablefile." $! </font>");
  return "error:$!";   return "error:$!";
     }      } else {
     else {  
  &logthis('<font color="green"> Installed new '.$tablefile   &logthis('<font color="green"> Installed new '.$tablefile
  ."</font>");   ."</font>");
   
Line 483  sub ReinitProcess { Line 717  sub ReinitProcess {
     }      }
     return 'ok';      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:
   #      0     - Invalid scriptline.
   #      1     - Valid scriptline
   #  NOTE:
   #     Only the command syntax is checked, not the executability of the
   #     command.
   #
   sub isValidEditCommand {
       my $scriptline = shift;
   
       #   Line elements are pipe separated:
   
       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.
       }
       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,$name,$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);
       
   }
   #
   #   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 ($request, $filetype, $script) = split(/:/, $request,3); # : in script
   
       #  Check the pre-coditions for success:
   
       if($request != "edit") { # Something is amiss afoot alack.
    return "error:edit request detected, but request != 'edit'\n";
       }
       if( ($filetype ne "hosts")  &&
    ($filetype ne "domain")) {
    return "error:edit requested with invalid file specifier: $filetype \n";
       }
   
       #   Split the edit script and check it's validity.
   
       my @scriptlines = split(/\n/, $script);  # one line per element.
       my $linecount   = scalar(@scriptlines);
       for(my $i = 0; $i < $linecount; $i++) {
    chomp($scriptlines[$i]);
    if(!isValidEditCommand($scriptlines[$i])) {
       return "error:edit with bad script line: '$scriptlines[$i]' \n";
    }
       }
   
       #   Execute the edit operation.
       #   - Create a config file editor for the appropriate file and 
       #   - execute each command in the script:
       #
       my $configfile = ConfigFileFromSelector($filetype);
       if (!(defined $configfile)) {
    return "refused\n";
       }
       my $editor = ConfigFileEdit->new($configfile);
   
       for (my $i = 0; $i < $linecount; $i++) {
    ApplyEdit($scriptlines[$i], $editor);
       }
       # If the file is the host file, ensure that our host is
       # adjusted to have our ip:
       #
       if($filetype eq "host") {
    AdjustOurHost($editor);
       }
       #  Finally replace the current file with our file.
       #
       ReplaceConfigFile($configfile, $editor);
   
       return "ok\n";
   }
   
   #   read_profile
   #
   #   Returns a set of specific entries from a user's profile file.
   #   this is a utility function that is used by both get_profile_entry and
   #   get_profile_entry_encrypted.
   #
   # Parameters:
   #    udom       - Domain in which the user exists.
   #    uname      - User's account name (loncapa account)
   #    namespace  - The profile namespace to open.
   #    what       - A set of & separated queries.
   # Returns:
   #    If all ok: - The string that needs to be shipped back to the user.
   #    If failure - A string that starts with error: followed by the failure
   #                 reason.. note that this probabyl gets shipped back to the
   #                 user as well.
   #
   sub read_profile {
       my ($udom, $uname, $namespace, $what) = @_;
       
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_READER());
       if ($hashref) {
           my @queries=split(/\&/,$what);
           my $qresult='';
   
    for (my $i=0;$i<=$#queries;$i++) {
       $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
    }
    $qresult=~s/\&$//;              # Remove trailing & from last lookup.
    if (&untie_user_hash($hashref)) {
       return $qresult;
    } else {
       return "error: ".($!+0)." untie (GDBM) Failed";
    }
       } else {
    if ($!+0 == 2) {
       return "error:No such file or GDBM reported bad block error";
    } else {
       return "error: ".($!+0)." tie (GDBM) Failed";
    }
       }
   
   }
   #--------------------- Request Handlers --------------------------------------------
   #
   #   By convention each request handler registers itself prior to the sub 
   #   declaration:
   #
   
   #++
   #
   #  Handles ping requests.
   #  Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host we are
   #                       known as.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   sub ping_handler {
       my ($cmd, $tail, $client) = @_;
       Debug("$cmd $tail $client .. $currenthostid:");
      
       Reply( $client,"$currenthostid\n","$cmd:$tail");
      
       return 1;
   }
   &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.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host we are
   #                       connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   sub pong_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
       my $reply=&reply("ping",$clientname);
       &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
       return 1;
   }
   &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
   
   #++
   #      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:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Implicit Outputs:
   #      Reply information is sent to the client.
   #      $cipher is set with a reference to a new IDEA encryption object.
   #
   sub establish_key_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
       my $buildkey=time.$$.int(rand 100000);
       $buildkey=~tr/1-6/A-F/;
       $buildkey=int(rand 100000).$buildkey.int(rand 100000);
       my $key=$currenthostid.$clientname;
       $key=~tr/a-z/A-Z/;
       $key=~tr/G-P/0-9/;
       $key=~tr/Q-Z/0-9/;
       $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
       $key=substr($key,0,32);
       my $cipherkey=pack("H32",$key);
       $cipher=new IDEA $cipherkey;
       &Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
      
       return 1;
   
   }
   &register_handler("ekey", \&establish_key_handler, 0, 1,1);
   
   #     Handler for the load command.  Returns the current system load average
   #     to the requestor.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   sub load_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
      # 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
   
       my $loadavg;
       my $loadfile=IO::File->new('/proc/loadavg');
      
       $loadavg=<$loadfile>;
       $loadavg =~ s/\s.*//g;                      # Extract the first field only.
      
       my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
   
       &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
      
       return 1;
   }
   &register_handler("load", \&load_handler, 0, 1, 0);
   
   #
   #   Process the userload request.  This sub returns to the client the current
   #  user load average.  It can be invoked either by clients or managers.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit inputs:
   #     whatever the userload() function requires.
   #  Implicit outputs:
   #     the reply is written to the client.
   #
   sub user_load_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
       my $userloadpercent=&userload();
       &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
       
       return 1;
   }
   &register_handler("userload", \&user_load_handler, 0, 1, 0);
   
   #   Process a request for the authorization type of a user:
   #   (userauth).
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit outputs:
   #    The user authorization type is written to the client.
   #
   sub user_authorization_type {
       my ($cmd, $tail, $replyfd) = @_;
      
       my $userinput = "$cmd:$tail";
      
       #  Pull the domain and username out of the command tail.
       # and call get_auth_type to determine the authentication type.
      
       my ($udom,$uname)=split(/:/,$tail);
       my $result = &get_auth_type($udom, $uname);
       if($result eq "nouser") {
    &Failure( $replyfd, "unknown_user\n", $userinput);
       } else {
    #
    # We only want to pass the second field from get_auth_type
    # for ^krb.. otherwise we'll be handing out the encrypted
    # password for internals e.g.
    #
    my ($type,$otherinfo) = split(/:/,$result);
    if($type =~ /^krb/) {
       $type = $result;
    } else {
               $type .= ':';
           }
    &Reply( $replyfd, "$type\n", $userinput);
       }
     
       return 1;
   }
   &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
   
   #   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
   #   that already exist to do this.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $client - File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit Output:
   #    a reply is written to the client.
   sub push_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
   
       # At this time we only know that the IP of our partner is a valid manager
       # the code below is a hook to do further authentication (e.g. to resolve
       # spoofing).
   
       my $cert = &GetCertificate($userinput);
       if(&ValidManager($cert)) { 
   
    # Now presumably we have the bona fides of both the peer host and the
    # process making the request.
         
    my $reply = &PushFile($userinput);
    &Reply($client, "$reply\n", $userinput);
   
       } else {
    &Failure( $client, "refused\n", $userinput);
       } 
       return 1;
   }
   &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
   
   #
   #   du  - list the disk usuage of a directory recursively. 
   #    
   #   note: stolen code from the ls file handler
   #   under construction by Rick Banghart 
   #    .
   # Parameters:
   #    $cmd        - The command that dispatched us (du).
   #    $ududir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub du_handler {
       my ($cmd, $ududir, $client) = @_;
       my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
       my $userinput = "$cmd:$ududir";
   
       if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
    &Failure($client,"refused\n","$cmd:$ududir");
    return 1;
       }
       #  Since $ududir could have some nasties in it,
       #  we will require that ududir is a valid
       #  directory.  Just in case someone tries to
       #  slip us a  line like .;(cd /home/httpd rm -rf*)
       #  etc.
       #
       if (-d $ududir) {
    my $total_size=0;
    my $code=sub { 
       if ($_=~/\.\d+\./) { return;} 
       if ($_=~/\.meta$/) { return;}
       $total_size+=(stat($_))[7];
    };
    chdir($ududir);
    find($code,$ududir);
    $total_size=int($total_size/1024);
    &Reply($client,"$total_size\n","$cmd:$ududir");
       } else {
    &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 
       }
       return 1;
   }
   &register_handler("du", \&du_handler, 0, 1, 0);
   
   #
   # The ls_handler routine should be considered obosolete and is retained
   # for communication with legacy servers.  Please see the ls2_handler.
   #
   #   ls  - list the contents of a directory.  For each file in the
   #    selected directory the filename followed by the full output of
   #    the stat function is returned.  The returned info for each
   #    file are separated by ':'.  The stat fields are separated by &'s.
   # Parameters:
   #    $cmd        - The command that dispatched us (ls).
   #    $ulsdir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub ls_handler {
       # obsoleted by ls2_handler
       my ($cmd, $ulsdir, $client) = @_;
   
       my $userinput = "$cmd:$ulsdir";
   
       my $obs;
       my $rights;
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
    if(-d $ulsdir) {
       if (opendir(LSDIR,$ulsdir)) {
    while ($ulsfn=readdir(LSDIR)) {
       undef($obs);
       undef($rights); 
       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
       #We do some obsolete checking here
       if(-e $ulsdir.'/'.$ulsfn.".meta") { 
    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
    my @obsolete=<FILE>;
    foreach my $obsolete (@obsolete) {
       if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
       if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
    }
       }
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
       if($obs eq '1') { $ulsout.="&1"; }
       else { $ulsout.="&0"; }
       if($rights eq '1') { $ulsout.="&1:"; }
       else { $ulsout.="&0:"; }
    }
    closedir(LSDIR);
       }
    } else {
       my @ulsstats=stat($ulsdir);
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
    }
       } else {
    $ulsout='no_such_dir';
       }
       if ($ulsout eq '') { $ulsout='empty'; }
       &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
       
       return 1;
   
   }
   &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
   #   lonc or lond be reinitialized so that an updated 
   #   host.tab or domain.tab can be processed.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $client - File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   #  Implicit output:
   #     a reply is sent to the client.
   #
   sub reinit_process_handler {
       my ($cmd, $tail, $client) = @_;
      
       my $userinput = "$cmd:$tail";
      
       my $cert = &GetCertificate($userinput);
       if(&ValidManager($cert)) {
    chomp($userinput);
    my $reply = &ReinitProcess($userinput);
    &Reply( $client,  "$reply\n", $userinput);
       } else {
    &Failure( $client, "refused\n", $userinput);
       }
       return 1;
   }
   &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
   
   #  Process the editing script for a table edit operation.
   #  the editing operation must be encrypted and requested by
   #  a manager host.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $client - File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   #  Implicit output:
   #     a reply is sent to the client.
   #
   sub edit_table_handler {
       my ($command, $tail, $client) = @_;
      
       my $userinput = "$command:$tail";
   
       my $cert = &GetCertificate($userinput);
       if(&ValidManager($cert)) {
    my($filetype, $script) = split(/:/, $tail);
    if (($filetype eq "hosts") || 
       ($filetype eq "domain")) {
       if($script ne "") {
    &Reply($client,              # BUGBUG - EditFile
         &EditFile($userinput), #   could fail.
         $userinput);
       } else {
    &Failure($client,"refused\n",$userinput);
       }
    } else {
       &Failure($client,"refused\n",$userinput);
    }
       } else {
    &Failure($client,"refused\n",$userinput);
       }
       return 1;
   }
   &register_handler("edit", \&edit_table_handler, 1, 0, 1);
   
   #
   #   Authenticate a user against the LonCAPA authentication
   #   database.  Note that there are several authentication
   #   possibilities:
   #   - unix     - The user can be authenticated against the unix
   #                password file.
   #   - internal - The user can be authenticated against a purely 
   #                internal per user password file.
   #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
   #                ticket granting authority.
   #   - user     - The person tailoring LonCAPA can supply a user authentication
   #                mechanism that is per system.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub authenticate_handler {
       my ($cmd, $tail, $client) = @_;
   
       
       #  Regenerate the full input line 
       
       my $userinput  = $cmd.":".$tail;
       
       #  udom    - User's domain.
       #  uname   - Username.
       #  upass   - User's password.
       
       my ($udom,$uname,$upass)=split(/:/,$tail);
       &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
       chomp($upass);
       $upass=&unescape($upass);
   
       my $pwdcorrect = &validate_user($udom, $uname, $upass);
       if($pwdcorrect) {
    &Reply( $client, "authorized\n", $userinput);
    #
    #  Bad credentials: Failed to authorize
    #
       } else {
    &Failure( $client, "non_authorized\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("auth", \&authenticate_handler, 1, 1, 0);
   
   #
   #   Change a user's password.  Note that this function is complicated by
   #   the fact that a user may be authenticated in more than one way:
   #   At present, we are not able to change the password for all types of
   #   authentication methods.  Only for:
   #      unix    - unix password or shadow passoword style authentication.
   #      local   - Locally written authentication mechanism.
   #   For now, kerb4 and kerb5 password changes are not supported and result
   #   in an error.
   # FUTURE WORK:
   #    Support kerberos passwd changes?
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   sub change_password_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
   
       #
       #  udom  - user's domain.
       #  uname - Username.
       #  upass - Current password.
       #  npass - New password.
      
       my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
   
       $upass=&unescape($upass);
       $npass=&unescape($npass);
       &Debug("Trying to change password for $uname");
   
       # First require that the user can be authenticated with their
       # old password:
   
       my $validated = &validate_user($udom, $uname, $upass);
       if($validated) {
    my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
   
    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
    if ($howpwd eq 'internal') {
       &Debug("internal auth");
       my $salt=time;
       $salt=substr($salt,6,2);
       my $ncpass=crypt($npass,$salt);
       if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
    &logthis("Result of password change for "
    ."$uname: pwchange_success");
    &Reply($client, "ok\n", $userinput);
       } else {
    &logthis("Unable to open $uname passwd "               
    ."to change password");
    &Failure( $client, "non_authorized\n",$userinput);
       }
    } elsif ($howpwd eq 'unix') {
       my $result = &change_unix_password($uname, $npass);
       &logthis("Result of password change for $uname: ".
        $result);
       &Reply($client, "$result\n", $userinput);
    } else {
       # this just means that the current password mode is not
       # one we know how to change (e.g the kerberos auth modes or
       # locally written auth handler).
       #
       &Failure( $client, "auth_mode_error\n", $userinput);
    }  
   
       } else {
    &Failure( $client, "non_authorized\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("passwd", \&change_password_handler, 1, 1, 0);
   
   #
   #   Create a new user.  User in this case means a lon-capa user.
   #   The user must either already exist in some authentication realm
   #   like kerberos or the /etc/passwd.  If not, a user completely local to
   #   this loncapa system is created.
   #
   # 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.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   sub add_user_handler {
   
       my ($cmd, $tail, $client) = @_;
   
   
       my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
       my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
   
       &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
   
   
       if($udom eq $currentdomainid) { # Reject new users for other domains...
   
    my $oldumask=umask(0077);
    chomp($npass);
    $npass=&unescape($npass);
    my $passfilename  = &password_path($udom, $uname);
    &Debug("Password file created will be:".$passfilename);
    if (-e $passfilename) {
       &Failure( $client, "already_exists\n", $userinput);
    } else {
       my $fperror='';
       if (!&mkpath($passfilename)) {
    $fperror="error: ".($!+0)." mkdir failed while attempting "
       ."makeuser";
       }
       unless ($fperror) {
    my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
    &Reply($client, $result, $userinput);     #BUGBUG - could be fail
       } else {
    &Failure($client, "$fperror\n", $userinput);
       }
    }
    umask($oldumask);
       }  else {
    &Failure($client, "not_right_domain\n",
    $userinput); # Even if we are multihomed.
       
       }
       return 1;
   
   }
   &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
   
   #
   #   Change the authentication method of a user.  Note that this may
   #   also implicitly change the user's password if, for example, the user is
   #   joining an existing authentication realm.  Known authentication realms at
   #   this time are:
   #    internal   - Purely internal password file (only loncapa knows this user)
   #    local      - Institutionally written authentication module.
   #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
   #    kerb4      - kerberos version 4
   #    kerb5      - kerberos version 5
   #
   # 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.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   # NOTE:
   #   This is also used to change the authentication credential values (e.g. passwd).
   #   
   #
   sub change_authentication_handler {
   
       my ($cmd, $tail, $client) = @_;
      
       my $userinput  = "$cmd:$tail";              # Reconstruct user input.
   
       my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
       &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
       if ($udom ne $currentdomainid) {
    &Failure( $client, "not_right_domain\n", $client);
       } else {
   
    chomp($npass);
   
    $npass=&unescape($npass);
    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 just changing the unix passwd. need to arrange to run
       # passwd since otherwise make_passwd_file will run
       # lcuseradd which fails if an account already exists
       # (to prevent an unscrupulous LONCAPA admin from stealing
       # an existing account by overwriting it as a LonCAPA account).
   
       if(($oldauth =~/^unix/) && ($umode eq "unix")) {
    my $result = &change_unix_password($uname, $npass);
    &logthis("Result of password change for $uname: ".$result);
    if ($result eq "ok") {
       &Reply($client, "$result\n")
    } else {
       &Failure($client, "$result\n");
    }
       } else {
    my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
    #
    #  If the current auth mode is internal, and the old auth mode was
    #  unix, or krb*,  and the user is an author for this domain,
    #  re-run manage_permissions for that role in order to be able
    #  to take ownership of the construction space back to www:www
    #
   
   
    if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
       (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
       if(&is_author($udom, $uname)) {
    &Debug(" Need to manage author permissions...");
    &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
       }
    }
    &Reply($client, $result, $userinput);
       }
          
   
    } else {       
       &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
    }
       }
       return 1;
   }
   &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
   
   #
   #   Determines if this is the home server for a user.  The home server
   #   for a user will have his/her lon-capa passwd file.  Therefore all we need
   #   to do is determine if this file exists.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub is_home_handler {
       my ($cmd, $tail, $client) = @_;
      
       my $userinput  = "$cmd:$tail";
      
       my ($udom,$uname)=split(/:/,$tail);
       chomp($uname);
       my $passfile = &password_filename($udom, $uname);
       if($passfile) {
    &Reply( $client, "found\n", $userinput);
       } else {
    &Failure($client, "not_found\n", $userinput);
       }
       return 1;
   }
   &register_handler("home", \&is_home_handler, 0,1,0);
   
   #
   #   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.
   #   If the resource is not local, then we must update, or at least invalidate our
   #   cached copy of the resource. 
   #   FUTURE WORK:
   #      I need to look at this logic carefully.  My druthers would be to follow
   #      typical caching logic, and simple invalidate the cache, drop any subscription
   #      an let the next fetch start the ball rolling again... however that may
   #      actually be more difficult than it looks given the complex web of
   #      proxy servers.
   # 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.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub update_resource_handler {
   
       my ($cmd, $tail, $client) = @_;
      
       my $userinput = "$cmd:$tail";
      
       my $fname= $tail; # This allows interactive testing
   
   
       my $ownership=ishome($fname);
       if ($ownership eq 'not_owner') {
    if (-e $fname) {
       my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
    $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
       my $now=time;
       my $since=$now-$atime;
       if ($since>$perlvar{'lonExpire'}) {
    my $reply=&reply("unsub:$fname","$clientname");
    &devalidate_meta_cache($fname);
    unlink("$fname");
    unlink("$fname.meta");
       } else {
    my $transname="$fname.in.transfer";
    my $remoteurl=&reply("sub:$fname","$clientname");
    my $response;
    alarm(120);
    {
       my $ua=new LWP::UserAgent;
       my $request=new HTTP::Request('GET',"$remoteurl");
       $response=$ua->request($request,$transname);
    }
    alarm(0);
    if ($response->is_error()) {
       unlink($transname);
       my $message=$response->status_line;
       &logthis("LWP GET: $message for $fname ($remoteurl)");
    } else {
       if ($remoteurl!~/\.meta$/) {
    alarm(120);
    {
       my $ua=new LWP::UserAgent;
       my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
       my $mresponse=$ua->request($mrequest,$fname.'.meta');
       if ($mresponse->is_error()) {
    unlink($fname.'.meta');
       }
    }
    alarm(0);
       }
       rename($transname,$fname);
       &devalidate_meta_cache($fname);
    }
       }
       &Reply( $client, "ok\n", $userinput);
    } else {
       &Failure($client, "not_found\n", $userinput);
    }
       } else {
    &Failure($client, "rejected\n", $userinput);
       }
       return 1;
   }
   &register_handler("update", \&update_resource_handler, 0 ,1, 0);
   
   sub devalidate_meta_cache {
       my ($url) = @_;
       use Cache::Memcached;
       my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
       $url = &declutter($url);
       $url =~ s-\.meta$--;
       my $id = &escape('meta:'.$url);
       $memcache->delete($id);
   }
   
   sub declutter {
       my $thisfn=shift;
       $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
       $thisfn=~s/^\///;
       $thisfn=~s|^adm/wrapper/||;
       $thisfn=~s|^adm/coursedocs/showdoc/||;
       $thisfn=~s/^res\///;
       $thisfn=~s/\?.+$//;
       return $thisfn;
   }
   #
   #   Fetch a user file from a remote server to the user's home directory
   #   userfiles subdir.
   # 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 fetch_user_file_handler {
   
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
       my $fname           = $tail;
       my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
       my $udir=&propath($udom,$uname).'/userfiles';
       unless (-e $udir) {
    mkdir($udir,0770); 
       }
       Debug("fetch user file for $fname");
       if (-e $udir) {
    $ufile=~s/^[\.\~]+//;
   
    # 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 $transname=$udir.'/'.$ufile.'.in.transit';
    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
    my $response;
    Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
    alarm(120);
    {
       my $ua=new LWP::UserAgent;
       my $request=new HTTP::Request('GET',"$remoteurl");
       $response=$ua->request($request,$transname);
    }
    alarm(0);
    if ($response->is_error()) {
       unlink($transname);
       my $message=$response->status_line;
       &logthis("LWP GET: $message for $fname ($remoteurl)");
       &Failure($client, "failed\n", $userinput);
    } else {
       Debug("Renaming $transname to $destname");
       if (!rename($transname,$destname)) {
    &logthis("Unable to move $transname to $destname");
    unlink($transname);
    &Failure($client, "failed\n", $userinput);
       } else {
    &Reply($client, "ok\n", $userinput);
       }
    }   
       } else {
    &Failure($client, "not_home\n", $userinput);
       }
       return 1;
   }
   &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
   
   #
   #   Remove a file from 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 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:
   #    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 mkdir_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
       $dir=&unescape($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);
   
   #
   #   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);
       my $reply="non_auth\n";
       if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
        $session.'.id')) {
    flock(ENVIN,LOCK_SH);
    while (my $line=<ENVIN>) {
       my ($envname)=split(/=/,$line,2);
       $envname=&unescape($envname);
       if ($envname=~ m|^userfile\.\Q$fname\E|) { $reply="ok\n"; }
    }
    close(ENVIN);
    &Reply($client, $reply, "$cmd:$tail");
       } else {
    &Failure($client, "invalid_token\n", "$cmd:$tail");
       }
       return 1;
   
   }
   &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
   
   #
   #   Unsubscribe from a resource.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub unsubscribe_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput= "$cmd:$tail";
       
       my ($fname) = split(/:/,$tail); # Split in case there's extrs.
   
       &Debug("Unsubscribing $fname");
       if (-e $fname) {
    &Debug("Exists");
    &Reply($client, &unsub($fname,$clientip), $userinput);
       } else {
    &Failure($client, "not_found\n", $userinput);
       }
       return 1;
   }
   &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
   
   #   Subscribe to a resource
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub subscribe_handler {
       my ($cmd, $tail, $client)= @_;
   
       my $userinput  = "$cmd:$tail";
   
       &Reply( $client, &subscribe($userinput,$clientip), $userinput);
   
       return 1;
   }
   &register_handler("sub", \&subscribe_handler, 0, 1, 0);
   
   #
   #   Determine the version of a resource (?) Or is it return
   #   the top version of the resource?  Not yet clear from the
   #   code in currentversion.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub current_version_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput= "$cmd:$tail";
      
       my $fname   = $tail;
       &Reply( $client, &currentversion($fname)."\n", $userinput);
       return 1;
   
   }
   &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
   
   #  Make an entry in a user's activity log.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub activity_log_handler {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput= "$cmd:$tail";
   
       my ($udom,$uname,$what)=split(/:/,$tail);
       chomp($what);
       my $proname=&propath($udom,$uname);
       my $now=time;
       my $hfh;
       if ($hfh=IO::File->new(">>$proname/activity.log")) { 
    print $hfh "$now:$clientname:$what\n";
    &Reply( $client, "ok\n", $userinput); 
       } else {
    &Failure($client, "error: ".($!+0)." IO::File->new Failed "
    ."while attempting log\n", 
    $userinput);
       }
   
       return 1;
   }
   &register_handler("log", \&activity_log_handler, 0, 1, 0);
   
   #
   #   Put a namespace entry in a user profile hash.
   #   My druthers would be for this to be an encrypted interaction too.
   #   anything that might be an inadvertent covert channel about either
   #   user authentication or user personal information....
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub put_user_profile_entry {
       my ($cmd, $tail, $client)  = @_;
   
       my $userinput = "$cmd:$tail";
       
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
       if ($namespace ne 'roles') {
    chomp($what);
    my $hashref = &tie_user_hash($udom, $uname, $namespace,
     &GDBM_WRCREAT(),"P",$what);
    if($hashref) {
       my @pairs=split(/\&/,$what);
       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);
       }
    } else {
       &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting put\n", $userinput);
    }
       } else {
           &Failure( $client, "refused\n", $userinput);
       }
       
       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;
   }
   &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
   
   # 
   #   Increment a profile entry in the user history file.
   #   The history contains keyword value pairs.  In this case,
   #   The value itself is a pair of numbers.  The first, the current value
   #   the second an increment that this function applies to the current
   #   value.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub increment_user_value_handler {
       my ($cmd, $tail, $client) = @_;
       
       my $userinput   = "$cmd:$tail";
       
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
       if ($namespace ne 'roles') {
           chomp($what);
    my $hashref = &tie_user_hash($udom, $uname,
        $namespace, &GDBM_WRCREAT(),
        "P",$what);
    if ($hashref) {
       my @pairs=split(/\&/,$what);
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
                   $value = &unescape($value);
    # We could check that we have a number...
    if (! defined($value) || $value eq '') {
       $value = 1;
    }
    $hashref->{$key}+=$value;
                   if ($namespace eq 'nohist_resourcetracker') {
                       if ($hashref->{$key} < 0) {
                           $hashref->{$key} = 0;
                       }
                   }
       }
       if (&untie_user_hash($hashref)) {
    &Reply( $client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
    "while attempting inc\n", $userinput);
       }
    } else {
       &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting inc\n", $userinput);
    }
       } else {
    &Failure($client, "refused\n", $userinput);
       }
       
       return 1;
   }
   &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
   
   #
   #   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
   #   for a person grants the permissions packaged with that role
   #   to that user when the role is selected.
   #
   # Parameters:
   #    $cmd       - The command string (rolesput).
   #    $tail      - The remainder of the request line.  For rolesput this
   #                 consists of a colon separated list that contains:
   #                 The domain and user that is granting the role (logged).
   #                 The domain and user that is getting the role.
   #                 The roles being granted as a set of & separated pairs.
   #                 each pair a key value pair.
   #    $client    - File descriptor connected to the client.
   # Returns:
   #     0         - If the daemon should exit
   #     1         - To continue processing.
   #
   #
   sub roles_put_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput  = "$cmd:$tail";
   
       my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
       
   
       my $namespace='roles';
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_WRCREAT(), "P",
    "$exedom:$exeuser:$what");
       #
       #  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
       #  is done on close this improves the chances the log will be an un-
       #  corrupted ordered thing.
       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);
    foreach my $pair (@pairs) {
       my ($key,$value)=split(/=/,$pair);
       &manage_permissions($key, $udom, $uname,
          $auth_type);
       $hashref->{$key}=$value;
    }
    if (&untie_user_hash($hashref)) {
       &Reply($client, "ok\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting rolesput\n", $userinput);
    }
       } else {
    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting rolesput\n", $userinput);
       }
       return 1;
   }
   &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
   
   #
   #   Deletes (removes) a role for a user.   This is equivalent to removing
   #  a permissions package associated with the role from the user's profile.
   #
   # Parameters:
   #     $cmd                 - The command (rolesdel)
   #     $tail                - The remainder of the request line. This consists
   #                             of:
   #                             The domain and user requesting the change (logged)
   #                             The domain and user being changed.
   #                             The roles being revoked.  These are shipped to us
   #                             as a bunch of & separated role name keywords.
   #     $client              - The file handle open on the client.
   # Returns:
   #     1                    - Continue processing
   #     0                    - Exit.
   #
   sub roles_delete_handler {
       my ($cmd, $tail, $client)  = @_;
   
       my $userinput    = "$cmd:$tail";
      
       my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
       &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
      "what = ".$what);
       my $namespace='roles';
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_WRCREAT(), "D",
    "$exedom:$exeuser:$what");
       
       if ($hashref) {
    my @rolekeys=split(/\&/,$what);
   
    foreach my $key (@rolekeys) {
       delete $hashref->{$key};
    }
    if (&untie_user_hash($hashref)) {
       &Reply($client, "ok\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting rolesdel\n", $userinput);
    }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting rolesdel\n", $userinput);
       }
       
       return 1;
   }
   &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
   
   # Unencrypted get from a user's profile database.  See 
   # GetProfileEntryEncrypted for a version that does end-to-end encryption.
   # This function retrieves a keyed item from a specific named database in the
   # user's directory.
   #
   # Parameters:
   #   $cmd             - Command request keyword (get).
   #   $tail            - Tail of the command.  This is a colon separated list
   #                      consisting of the domain and username that uniquely
   #                      identifies the profile,
   #                      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.
   #   $client          - File descriptor open on the client.
   # Returns:
   #   1       - Continue processing.
   #   0       - Exit.
   #
   sub get_profile_entry {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput= "$cmd:$tail";
      
       my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
       chomp($what);
   
       my $replystring = read_profile($udom, $uname, $namespace, $what);
       my ($first) = split(/:/,$replystring);
       if($first ne "error") {
    &Reply($client, "$replystring\n", $userinput);
       } else {
    &Failure($client, $replystring." while attempting get\n", $userinput);
       }
       return 1;
   
   
   }
   &register_handler("get", \&get_profile_entry, 0,1,0);
   
   #
   #  Process the encrypted get request.  Note that the request is sent
   #  in clear, but the reply is encrypted.  This is a small covert channel:
   #  information about the sensitive keys is given to the snooper.  Just not
   #  information about the values of the sensitive key.  Hmm if I wanted to
   #  know these I'd snoop for the egets. Get the profile item names from them
   #  and then issue a get for them since there's no enforcement of the
   #  requirement of an encrypted get for particular profile items.  If I
   #  were re-doing this, I'd force the request to be encrypted as well as the
   #  reply.  I'd also just enforce encrypted transactions for all gets since
   #  that would prevent any covert channel snooping.
   #
   #  Parameters:
   #     $cmd               - Command keyword of request (eget).
   #     $tail              - Tail of the command.  See GetProfileEntry #                          for more information about this.
   #     $client            - File open on the client.
   #  Returns:
   #     1      - Continue processing
   #     0      - server should exit.
   sub get_profile_entry_encrypted {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
      
       my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
       chomp($what);
       my $qresult = read_profile($udom, $uname, $namespace, $what);
       my ($first) = split(/:/, $qresult);
       if($first ne "error") {
   
    if ($cipher) {
       my $cmdlength=length($qresult);
       $qresult.="         ";
       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", $userinput);
       }
       } else {
    &Failure($client, "$qresult while attempting eget\n", $userinput);
   
       }
       
       return 1;
   }
   &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
   
   #
   #   Deletes a key in a user profile database.
   #   
   #   Parameters:
   #       $cmd                  - Command keyword (del).
   #       $tail                 - Command tail.  IN this case a colon
   #                               separated list containing:
   #                               The domain and user that identifies uniquely
   #                               the identity of the user.
   #                               The profile namespace (name of the profile
   #                               database file).
   #                               & separated list of keywords to delete.
   #       $client              - File open on client socket.
   # Returns:
   #     1   - Continue processing
   #     0   - Exit server.
   #
   #
   sub delete_profile_entry {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "cmd:$tail";
   
       my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_WRCREAT(),
    "D",$what);
       if ($hashref) {
           my @keys=split(/\&/,$what);
    foreach my $key (@keys) {
       delete($hashref->{$key});
    }
    if (&untie_user_hash($hashref)) {
       &Reply($client, "ok\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting del\n", $userinput);
    }
       } else {
    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting del\n", $userinput);
       }
       return 1;
   }
   &register_handler("del", \&delete_profile_entry, 0, 1, 0);
   
   #
   #  List the set of keys that are defined in a profile database file.
   #  A successful reply from this will contain an & separated list of
   #  the keys. 
   # Parameters:
   #     $cmd              - Command request (keys).
   #     $tail             - Remainder of the request, a colon separated
   #                         list containing domain/user that identifies the
   #                         user being queried, and the database namespace
   #                         (database filename essentially).
   #     $client           - File open on the client.
   #  Returns:
   #    1    - Continue processing.
   #    0    - Exit the server.
   #
   sub get_profile_keys {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace)=split(/:/,$tail);
       my $qresult='';
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
     &GDBM_READER());
       if ($hashref) {
    foreach my $key (keys %$hashref) {
       $qresult.="$key&";
    }
    if (&untie_user_hash($hashref)) {
       $qresult=~s/\&$//;
       &Reply($client, "$qresult\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting keys\n", $userinput);
    }
       } else {
    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting keys\n", $userinput);
       }
      
       return 1;
   }
   &register_handler("keys", \&get_profile_keys, 0, 1, 0);
   
   #
   #   Dump the contents of a user profile database.
   #   Note that this constitutes a very large covert channel too since
   #   the dump will return sensitive information that is not encrypted.
   #   The naive security assumption is that the session negotiation ensures
   #   our client is trusted and I don't believe that's assured at present.
   #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
   #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
   # 
   #  Parameters:
   #     $cmd           - The command request keyword (currentdump).
   #     $tail          - Remainder of the request, consisting of a colon
   #                      separated list that has the domain/username and
   #                      the namespace to dump (database file).
   #     $client        - file open on the remote client.
   # Returns:
   #     1    - Continue processing.
   #     0    - Exit the server.
   #
   sub dump_profile_database {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
      
       my ($udom,$uname,$namespace) = split(/:/,$tail);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_READER());
       if ($hashref) {
    # Structure of %data:
    # $data{$symb}->{$parameter}=$value;
    # $data{$symb}->{'v.'.$parameter}=$version;
    # since $parameter will be unescaped, we do not
     # have to worry about silly parameter names...
   
           my $qresult='';
    my %data = ();                     # A hash of anonymous hashes..
    while (my ($key,$value) = each(%$hashref)) {
       my ($v,$symb,$param) = split(/:/,$key);
       next if ($v eq 'version' || $symb eq 'keys');
       next if (exists($data{$symb}) && 
        exists($data{$symb}->{$param}) &&
        $data{$symb}->{'v.'.$param} > $v);
       $data{$symb}->{$param}=$value;
       $data{$symb}->{'v.'.$param}=$v;
    }
    if (&untie_user_hash($hashref)) {
       while (my ($symb,$param_hash) = each(%data)) {
    while(my ($param,$value) = each (%$param_hash)){
       next if ($param =~ /^v\./);       # Ignore versions...
       #
       #   Just dump the symb=value pairs separated by &
       #
       $qresult.=$symb.':'.$param.'='.$value.'&';
    }
       }
       chop($qresult);
       &Reply($client , "$qresult\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting currentdump\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting currentdump\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
   
   #
   #   Dump a profile database with an optional regular expression
   #   to match against the keys.  In this dump, no effort is made
   #   to separate symb from version information. Presumably the
   #   databases that are dumped by this command are of a different
   #   structure.  Need to look at this and improve the documentation of
   #   both this and the currentdump handler.
   # Parameters:
   #    $cmd                     - The command keyword.
   #    $tail                    - All of the characters after the $cmd:
   #                               These are expected to be a colon
   #                               separated list containing:
   #                               domain/user - identifying the user.
   #                               namespace   - identifying the database.
   #                               regexp      - optional regular expression
   #                                             that is matched against
   #                                             database keywords to do
   #                                             selective dumps.
   #   $client                   - Channel open on the client.
   # Returns:
   #    1    - Continue processing.
   # Side effects:
   #    response is written to $client.
   #
   sub dump_with_regexp {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
       if (defined($regexp)) {
    $regexp=&unescape($regexp);
       } else {
    $regexp='.';
       }
       my ($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, $namespace,
    &GDBM_READER());
       if ($hashref) {
           my $qresult='';
    my $count=0;
    while (my ($key,$value) = each(%$hashref)) {
       if ($regexp eq '.') {
    $count++;
    if (defined($range) && $count >= $end)   { last; }
    if (defined($range) && $count <  $start) { next; }
    $qresult.=$key.'='.$value.'&';
       } else {
    my $unescapeKey = &unescape($key);
    if (eval('$unescapeKey=~/$regexp/')) {
       $count++;
       if (defined($range) && $count >= $end)   { last; }
       if (defined($range) && $count <  $start) { next; }
       $qresult.="$key=$value&";
    }
       }
    }
    if (&untie_user_hash($hashref)) {
       chop($qresult);
       &Reply($client, "$qresult\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting dump\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting dump\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
   
   #  Store a set of key=value pairs associated with a versioned name.
   #
   #  Parameters:
   #    $cmd                - Request command keyword.
   #    $tail               - Tail of the request.  This is a colon
   #                          separated list containing:
   #                          domain/user - User and authentication domain.
   #                          namespace   - Name of the database being modified
   #                          rid         - Resource keyword to modify.
   #                          what        - new value associated with rid.
   #
   #    $client             - Socket open on the client.
   #
   #
   #  Returns:
   #      1 (keep on processing).
   #  Side-Effects:
   #    Writes to the client
   sub store_handler {
       my ($cmd, $tail, $client) = @_;
    
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
       if ($namespace ne 'roles') {
   
    chomp($what);
    my @pairs=split(/\&/,$what);
    my $hashref  = &tie_user_hash($udom, $uname, $namespace,
          &GDBM_WRCREAT(), "S",
          "$rid:$what");
    if ($hashref) {
       my $now = time;
       my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
       my $key;
       $hashref->{"version:$rid"}++;
       my $version=$hashref->{"version:$rid"};
       my $allkeys=''; 
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $allkeys.=$key.':';
    $hashref->{"$version:$rid:$key"}=$value;
       }
       $hashref->{"$version:$rid:timestamp"}=$now;
       $allkeys.='timestamp';
       $hashref->{"$version:keys:$rid"}=$allkeys;
       if (&untie_user_hash($hashref)) {
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    "while attempting store\n", $userinput);
       }
    } else {
       &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting store\n", $userinput);
    }
       } else {
    &Failure($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", $userinput);
       } else {
    &Failure($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("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;
   }
   
   #
   #  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:
   #     $cmd               - Command keyword.
   #     $tail              - Remainder of the request which consists of:
   #                          domain/user   - User and auth. domain.
   #                          namespace     - name of resource database.
   #                          rid           - Resource id.
   #    $client             - socket open on the client.
   #
   # Returns:
   #      1  indicating the caller should not yet exit.
   # Side-effects:
   #   Writes a reply to the client.
   #   The reply is a string of the following shape:
   #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
   #    Where the 1 above represents version 1.
   #    this continues for all pairs of keys in all versions.
   #
   #
   #    
   #
   sub restore_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail"; # Only used for logging purposes.
   
       my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
       $namespace=~s/\//\_/g;
       $namespace=~s/\W//g;
       chomp($rid);
       my $qresult='';
       my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
       if ($hashref) {
    my $version=$hashref->{"version:$rid"};
    $qresult.="version=$version&";
    my $scope;
    for ($scope=1;$scope<=$version;$scope++) {
       my $vkeys=$hashref->{"$scope:keys:$rid"};
       my @keys=split(/:/,$vkeys);
       my $key;
       $qresult.="$scope:keys=$vkeys&";
       foreach $key (@keys) {
    $qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
       }                                  
    }
    if (&untie_user_hash($hashref)) {
       $qresult=~s/\&$//;
       &Reply( $client, "$qresult\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting restore\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting restore\n", $userinput);
       }
     
       return 1;
   
   
   }
   &register_handler("restore", \&restore_handler, 0,1,0);
   
   #
   #   Add a chat message to a synchronous discussion board.
   #
   # Parameters:
   #    $cmd                - Request keyword.
   #    $tail               - Tail of the command. A colon separated list
   #                          containing:
   #                          cdom    - Domain on which the chat board lives
   #                          cnum    - Course containing the chat board.
   #                          newpost - Body of the posting.
   #                          group   - Optional group, if chat board is only 
   #                                    accessible in a group within the course 
   #   $client              - Socket open on the client.
   # Returns:
   #   1    - Indicating caller should keep on processing.
   #
   # Side-effects:
   #   writes a reply to the client.
   #
   #
   sub send_chat_handler {
       my ($cmd, $tail, $client) = @_;
   
       
       my $userinput = "$cmd:$tail";
   
       my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
       &chat_add($cdom,$cnum,$newpost,$group);
       &Reply($client, "ok\n", $userinput);
   
       return 1;
   }
   &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
   
   #
   #   Retrieve the set of chat messages from a discussion board.
   #
   #  Parameters:
   #    $cmd             - Command keyword that initiated the request.
   #    $tail            - Remainder of the request after the command
   #                       keyword.  In this case a colon separated list of
   #                       chat domain    - Which discussion board.
   #                       chat id        - Discussion thread(?)
   #                       domain/user    - Authentication domain and username
   #                                        of the requesting person.
   #                       group          - Optional course group containing
   #                                        the board.      
   #   $client           - Socket open on the client program.
   # Returns:
   #    1     - continue processing
   # Side effects:
   #    Response is written to the client.
   #
   sub retrieve_chat_handler {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput = "$cmd:$tail";
   
       my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
       my $reply='';
       foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
    $reply.=&escape($_).':';
       }
       $reply=~s/\:$//;
       &Reply($client, $reply."\n", $userinput);
   
   
       return 1;
   }
   &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
   
   #
   #  Initiate a query of an sql database.  SQL query repsonses get put in
   #  a file for later retrieval.  This prevents sql query results from
   #  bottlenecking the system.  Note that with loncnew, perhaps this is
   #  less of an issue since multiple outstanding requests can be concurrently
   #  serviced.
   #
   #  Parameters:
   #     $cmd       - COmmand keyword that initiated the request.
   #     $tail      - Remainder of the command after the keyword.
   #                  For this function, this consists of a query and
   #                  3 arguments that are self-documentingly labelled
   #                  in the original arg1, arg2, arg3.
   #     $client    - Socket open on the client.
   # Return:
   #    1   - Indicating processing should continue.
   # Side-effects:
   #    a reply is written to $client.
   #
   sub send_query_handler {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput = "$cmd:$tail";
   
       my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
       $query=~s/\n*$//g;
       &Reply($client, "". &sql_reply("$clientname\&$query".
    "\&$arg1"."\&$arg2"."\&$arg3")."\n",
     $userinput);
       
       return 1;
   }
   &register_handler("querysend", \&send_query_handler, 0, 1, 0);
   
   #
   #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
   #   The query is submitted via a "querysend" transaction.
   #   There it is passed on to the lonsql daemon, queued and issued to
   #   mysql.
   #     This transaction is invoked when the sql transaction is complete
   #   it stores the query results in flie and indicates query completion.
   #   presumably local software then fetches this response... I'm guessing
   #   the sequence is: lonc does a querysend, we ask lonsql to do it.
   #   lonsql on completion of the query interacts with the lond of our
   #   client to do a query reply storing two files:
   #    - id     - The results of the query.
   #    - id.end - Indicating the transaction completed. 
   #    NOTE: id is a unique id assigned to the query and querysend time.
   # Parameters:
   #    $cmd        - Command keyword that initiated this request.
   #    $tail       - Remainder of the tail.  In this case that's a colon
   #                  separated list containing the query Id and the 
   #                  results of the query.
   #    $client     - Socket open on the client.
   # Return:
   #    1           - Indicating that we should continue processing.
   # Side effects:
   #    ok written to the client.
   #
   sub reply_query_handler {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput = "$cmd:$tail";
   
       my ($cmd,$id,$reply)=split(/:/,$userinput); 
       my $store;
       my $execdir=$perlvar{'lonDaemons'};
       if ($store=IO::File->new(">$execdir/tmp/$id")) {
    $reply=~s/\&/\n/g;
    print $store $reply;
    close $store;
    my $store2=IO::File->new(">$execdir/tmp/$id.end");
    print $store2 "done\n";
    close $store2;
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)
    ." IO::File->new Failed ".
    "while attempting queryreply\n", $userinput);
       }
    
   
       return 1;
   }
   &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
   
   #
   #  Process the courseidput request.  Not quite sure what this means
   #  at the system level sense.  It appears a gdbm file in the 
   #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
   #  a set of entries made in that database.
   #
   # Parameters:
   #   $cmd      - The command keyword that initiated this request.
   #   $tail     - Tail of the command.  In this case consists of a colon
   #               separated list contaning the domain to apply this to and
   #               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().   
   #                      
   #   $client   - Socket open on the client.
   # Returns:
   #   1    - indicating that processing should continue
   #
   # Side effects:
   #   reply is written to the client.
   #
   sub put_course_id_handler {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput = "$cmd:$tail";
   
       my ($udom, $what) = split(/:/, $tail,2);
       chomp($what);
       my $now=time;
       my @pairs=split(/\&/,$what);
   
       my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
    foreach my $pair (@pairs) {
               my ($key,$courseinfo) = split(/=/,$pair,2);
               $courseinfo =~ s/=/:/g;
   
               my @current_items = split(/:/,$hashref->{$key});
               shift(@current_items); # remove description
               pop(@current_items);   # remove last access
               my $numcurrent = scalar(@current_items);
   
               my @new_items = split(/:/,$courseinfo);
               my $numnew = scalar(@new_items);
               if ($numcurrent > 0) {
                   if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 
                       for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
                           $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
                       }
                   }
               }
       $hashref->{$key}=$courseinfo.':'.$now;
    }
    if (&untie_domain_hash($hashref)) {
       &Reply( $client, "ok\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)
        ." untie(GDBM) Failed ".
        "while attempting courseidput\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting courseidput\n", $userinput);
       }
       
   
       return 1;
   }
   &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
   
   #  Retrieves the value of a course id resource keyword pattern
   #  defined since a starting date.  Both the starting date and the
   #  keyword pattern are optional.  If the starting date is not supplied it
   #  is treated as the beginning of time.  If the pattern is not found,
   #  it is treatred as "." matching everything.
   #
   #  Parameters:
   #     $cmd     - Command keyword that resulted in us being dispatched.
   #     $tail    - The remainder of the command that, in this case, consists
   #                of a colon separated list of:
   #                 domain   - The domain in which the course database is 
   #                            defined.
   #                 since    - Optional parameter describing the minimum
   #                            time of definition(?) of the resources that
   #                            will match the dump.
   #                 description - regular expression that is used to filter
   #                            the dump.  Only keywords matching this regexp
   #                            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.
   # Returns:
   #    1     - Continue processing.
   # Side Effects:
   #   a reply is written to $client.
   sub dump_course_id_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
           $typefilter) =split(/:/,$tail);
       if (defined($description)) {
    $description=&unescape($description);
       } else {
    $description='.';
       }
       if (defined($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='.';
       }
   
       unless (defined($since)) { $since=0; }
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
    while (my ($key,$value) = each(%$hashref)) {
       my ($descr,$lasttime,$inst_code,$owner,$type);
               my @courseitems = split(/:/,$value);
               $lasttime = pop(@courseitems);
       ($descr,$inst_code,$owner,$type)=@courseitems;
       if ($lasttime<$since) { next; }
               my $match = 1;
       unless ($description eq '.') {
    my $unescapeDescr = &unescape($descr);
    unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
                       $match = 0;
    }
               }
               unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
                   my $unescapeInstcode = &unescape($inst_code);
                   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 (!defined($type)) {
                       if ($typefilter ne 'Course') {
                           $match = 0;
                       }
                   } else { 
                       unless (eval('$unescapeType=~/^\Q$typefilter\E$/')) {
                           $match = 0;
                       }
                   }
               }
               if ($match == 1) {
                   $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
               }
    }
    if (&untie_domain_hash($hashref)) {
       chop($qresult);
       &Reply($client, "$qresult\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting courseiddump\n", $userinput);
       }
   
   
       return 1;
   }
   &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
   
   #
   #  Puts an id to a domains id database. 
   #
   #  Parameters:
   #   $cmd     - The command that triggered us.
   #   $tail    - Remainder of the request other than the command. This is a 
   #              colon separated list containing:
   #              $domain  - The domain for which we are writing the id.
   #              $pairs  - The id info to write... this is and & separated list
   #                        of keyword=value.
   #   $client  - Socket open on the client.
   #  Returns:
   #    1   - Continue processing.
   #  Side effects:
   #     reply is written to $client.
   #
   sub put_id_handler {
       my ($cmd,$tail,$client) = @_;
   
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$what)=split(/:/,$tail);
       chomp($what);
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "ids", &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 idput\n", $userinput);
    }
       } else {
    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
     "while attempting idput\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("idput", \&put_id_handler, 0, 1, 0);
   
   #
   #  Retrieves a set of id values from the id database.
   #  Returns an & separated list of results, one for each requested id to the
   #  client.
   #
   # Parameters:
   #   $cmd       - Command keyword that caused us to be dispatched.
   #   $tail      - Tail of the command.  Consists of a colon separated:
   #               domain - the domain whose id table we dump
   #               ids      Consists of an & separated list of
   #                        id keywords whose values will be fetched.
   #                        nonexisting keywords will have an empty value.
   #   $client    - Socket open on the client.
   #
   # Returns:
   #    1 - indicating processing should continue.
   # Side effects:
   #   An & separated list of results is written to $client.
   #
   sub get_id_handler {
       my ($cmd, $tail, $client) = @_;
   
       
       my $userinput = "$client:$tail";
       
       my ($udom,$what)=split(/:/,$tail);
       chomp($what);
       my @queries=split(/\&/,$what);
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
       if ($hashref) {
    for (my $i=0;$i<=$#queries;$i++) {
       $qresult.="$hashref->{$queries[$i]}&";
    }
    if (&untie_domain_hash($hashref)) {
       $qresult=~s/\&$//;
       &Reply($client, "$qresult\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
         "while attempting idget\n",$userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting idget\n",$userinput);
       }
       
       return 1;
   }
   &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;
   }
   
   &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
   #  create a file in the lonDaemons/tmp directory of the form $id.tmp
   # where Id is the client's ip concatenated with a sequence number.
   # The file will contain some value that is passed in.  Is this e.g.
   # a login token?
   #
   # Parameters:
   #    $cmd     - The command that got us dispatched.
   #    $tail    - The remainder of the request following $cmd:
   #               In this case this will be the contents of the file.
   #    $client  - Socket connected to the client.
   # Returns:
   #    1 indicating processing can continue.
   # Side effects:
   #   A file is created in the local filesystem.
   #   A reply is sent to the client.
   sub tmp_put_handler {
       my ($cmd, $what, $client) = @_;
   
       my $userinput = "$cmd:$what"; # Reconstruct for logging.
   
   
       my $store;
       $tmpsnum++;
       my $id=$$.'_'.$clientip.'_'.$tmpsnum;
       $id=~s/\W/\_/g;
       $what=~s/\n//g;
       my $execdir=$perlvar{'lonDaemons'};
       if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
    print $store $what;
    close $store;
    &Reply($client, "$id\n", $userinput);
       } else {
    &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
     "while attempting tmpput\n", $userinput);
       }
       return 1;
     
   }
   &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
   
   #   Processes the tmpget command.  This command returns the contents
   #  of a temporary resource file(?) created via tmpput.
   #
   # Paramters:
   #    $cmd      - Command that got us dispatched.
   #    $id       - Tail of the command, contain the id of the resource
   #                we want to fetch.
   #    $client   - socket open on the client.
   # Return:
   #    1         - Inidcating processing can continue.
   # Side effects:
   #   A reply is sent to the client.
   #
   sub tmp_get_handler {
       my ($cmd, $id, $client) = @_;
   
       my $userinput = "$cmd:$id"; 
       
   
       $id=~s/\W/\_/g;
       my $store;
       my $execdir=$perlvar{'lonDaemons'};
       if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
    my $reply=<$store>;
    &Reply( $client, "$reply\n", $userinput);
    close $store;
       } else {
    &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
     "while attempting tmpget\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
   
   #
   #  Process the tmpdel command.  This command deletes a temp resource
   #  created by the tmpput command.
   #
   # Parameters:
   #   $cmd      - Command that got us here.
   #   $id       - Id of the temporary resource created.
   #   $client   - socket open on the client process.
   #
   # Returns:
   #   1     - Indicating processing should continue.
   # Side Effects:
   #   A file is deleted
   #   A reply is sent to the client.
   sub tmp_del_handler {
       my ($cmd, $id, $client) = @_;
       
       my $userinput= "$cmd:$id";
       
       chomp($id);
       $id=~s/\W/\_/g;
       my $execdir=$perlvar{'lonDaemons'};
       if (unlink("$execdir/tmp/$id.tmp")) {
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
     "while attempting tmpdel\n", $userinput);
       }
       
       return 1;
   
   }
   &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
   
   #
   #   Processes the setannounce command.  This command
   #   creates a file named announce.txt in the top directory of
   #   the documentn root and sets its contents.  The announce.txt file is
   #   printed in its entirety at the LonCAPA login page.  Note:
   #   once the announcement.txt fileis created it cannot be deleted.
   #   However, setting the contents of the file to empty removes the
   #   announcement from the login page of loncapa so who cares.
   #
   # Parameters:
   #    $cmd          - The command that got us dispatched.
   #    $announcement - The text of the announcement.
   #    $client       - Socket open on the client process.
   # Retunrns:
   #   1             - Indicating request processing should continue
   # Side Effects:
   #   The file {DocRoot}/announcement.txt is created.
   #   A reply is sent to $client.
   #
   sub set_announce_handler {
       my ($cmd, $announcement, $client) = @_;
     
       my $userinput    = "$cmd:$announcement";
   
       chomp($announcement);
       $announcement=&unescape($announcement);
       if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
    '/announcement.txt')) {
    print $store $announcement;
    close $store;
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)."\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
   
   #
   #  Return the version of the daemon.  This can be used to determine
   #  the compatibility of cross version installations or, alternatively to
   #  simply know who's out of date and who isn't.  Note that the version
   #  is returned concatenated with the tail.
   # Parameters:
   #   $cmd        - the request that dispatched to us.
   #   $tail       - Tail of the request (client's version?).
   #   $client     - Socket open on the client.
   #Returns:
   #   1 - continue processing requests.
   # Side Effects:
   #   Replies with version to $client.
   sub get_version_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput  = $cmd.$tail;
       
       &Reply($client, &version($userinput)."\n", $userinput);
   
   
       return 1;
   }
   &register_handler("version", \&get_version_handler, 0, 1, 0);
   
   #  Set the current host and domain.  This is used to support
   #  multihomed systems.  Each IP of the system, or even separate daemons
   #  on the same IP can be treated as handling a separate lonCAPA virtual
   #  machine.  This command selects the virtual lonCAPA.  The client always
   #  knows the right one since it is lonc and it is selecting the domain/system
   #  from the hosts.tab file.
   # Parameters:
   #    $cmd      - Command that dispatched us.
   #    $tail     - Tail of the command (domain/host requested).
   #    $socket   - Socket open on the client.
   #
   # Returns:
   #     1   - Indicates the program should continue to process requests.
   # Side-effects:
   #     The default domain/system context is modified for this daemon.
   #     a reply is sent to the client.
   #
   sub set_virtual_host_handler {
       my ($cmd, $tail, $socket) = @_;
     
       my $userinput  ="$cmd:$tail";
   
       &Reply($client, &sethost($userinput)."\n", $userinput);
   
   
       return 1;
   }
   &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
   
   #  Process a request to exit:
   #   - "bye" is sent to the client.
   #   - The client socket is shutdown and closed.
   #   - We indicate to the caller that we should exit.
   # Formal Parameters:
   #   $cmd                - The command that got us here.
   #   $tail               - Tail of the command (empty).
   #   $client             - Socket open on the tail.
   # Returns:
   #   0      - Indicating the program should exit!!
   #
   sub exit_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$cmd:$tail";
   
       &logthis("Client $clientip ($clientname) hanging up: $userinput");
       &Reply($client, "bye\n", $userinput);
       $client->shutdown(2);        # shutdown the socket forcibly.
       $client->close();
   
       return 0;
   }
   &register_handler("exit", \&exit_handler, 0,1,1);
   &register_handler("init", \&exit_handler, 0,1,1);
   &register_handler("quit", \&exit_handler, 0,1,1);
   
   #  Determine if auto-enrollment is enabled.
   #  Note that the original had what I believe to be a defect.
   #  The original returned 0 if the requestor was not a registerd client.
   #  It should return "refused".
   # Formal Parameters:
   #   $cmd       - The command that invoked us.
   #   $tail      - The tail of the command (Extra command parameters.
   #   $client    - The socket open on the client that issued the request.
   # Returns:
   #    1         - Indicating processing should continue.
   #
   sub enrollment_enabled_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = $cmd.":".$tail; # For logging purposes.
   
       
       my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
   
       my $outcome  = &localenroll::run($cdom);
       &Reply($client, "$outcome\n", $userinput);
   
       return 1;
   }
   &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
   
   #   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(/:/, $tail);
       my @secs = &localenroll::get_sections($coursecode,$cdom);
       my $seclist = &escape(join(':',@secs));
   
       &Reply($client, "$seclist\n", $userinput);
       
   
       return 1;
   }
   &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
   
   #   Validate the owner of a new course section.  
   #
   # Formal Parameters:
   #   $cmd      - Command that got us dispatched.
   #   $tail     - the remainder of the command.  For us this consists of a
   #               colon separated string containing:
   #                  $inst    - Course Id from the institutions point of view.
   #                  $owner   - Proposed owner of the course.
   #                  $cdom    - Domain of the course (from the institutions
   #                             point of view?)..
   #   $client   - Socket open on the client.
   #
   # Returns:
   #   1        - Processing should continue.
   #
   sub validate_course_owner_handler {
       my ($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);
   
   
   
       return 1;
   }
   &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
   
   #
   #   Validate a course section in the official schedule of classes
   #   from the institutions point of view (part of autoenrollment).
   #
   # Formal Parameters:
   #   $cmd          - The command request that got us dispatched.
   #   $tail         - The tail of the command.  In this case,
   #                   this is a colon separated set of words that will be split
   #                   into:
   #                        $inst_course_id - The course/section id from the
   #                                          institutions point of view.
   #                        $cdom           - The domain from the institutions
   #                                          point of view.
   #   $client       - Socket open on the client.
   # Returns:
   #    1           - Indicating processing should continue.
   #
   sub validate_course_section_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($inst_course_id, $cdom) = split(/:/, $tail);
   
       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);
   
   #
   #   Create a password for a new auto-enrollment user.
   #   I think/guess, this password allows access to the institutions 
   #   AIS class list server/services.  Stuart can correct this comment
   #   when he finds out how wrong I am.
   #
   # Formal Parameters:
   #    $cmd     - The command request that got us dispatched.
   #    $tail    - The tail of the command.   In this case this is a colon separated
   #               set of words that will be split into:
   #               $authparam - An authentication parameter (username??).
   #               $cdom      - The domain of the course from the institution's
   #                            point of view.
   #    $client  - The socket open on the client.
   # Returns:
   #    1 - continue processing.
   #
   sub create_auto_enroll_password_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
   
       my ($authparam, $cdom) = split(/:/, $userinput);
   
       my ($create_passwd,$authchk);
       ($authparam,
        $create_passwd,
        $authchk) = &localenroll::create_password($authparam,$cdom);
   
       &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
      $userinput);
   
   
       return 1;
   }
   &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
     0, 1, 0);
   
   #   Retrieve and remove temporary files created by/during autoenrollment.
   #
   # 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);
   
   #   Does this have to be uncommented??!?  (RF).
   #
   #                                unlink($source);
    } else {
       &Failure($client, "error\n", $userinput);
    }
       } else {
    &Failure($client, "error\n", $userinput);
       }
       
   
       return 1;
   }
   &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
   
   #
   #   Read and retrieve institutional code format (for support form).
   # Formal Parameters:
   #    $cmd        - Command that dispatched us.
   #    $tail       - Tail of the command.  In this case it conatins 
   #                  the course domain and the coursename.
   #    $client     - Socket open on the client.
   # Returns:
   #    1     - Continue processing.
   #
   sub get_institutional_code_format_handler {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
   
       my $reply;
       my($cdom,$course) = split(/:/,$tail);
       my @pairs = split/\&/,$course;
       my %instcodes = ();
       my %codes = ();
       my @codetitles = ();
       my %cat_titles = ();
       my %cat_order = ();
       foreach (@pairs) {
    my ($key,$value) = split/=/,$_;
    $instcodes{&unescape($key)} = &unescape($value);
       }
       my $formatreply = &localenroll::instcode_format($cdom,
       \%instcodes,
       \%codes,
       \@codetitles,
       \%cat_titles,
       \%cat_order);
       if ($formatreply eq 'ok') {
    my $codes_str = &hash2str(%codes);
    my $codetitles_str = &array2str(@codetitles);
    my $cat_titles_str = &hash2str(%cat_titles);
    my $cat_order_str = &hash2str(%cat_order);
    &Reply($client,
          $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
          .$cat_order_str."\n",
          $userinput);
       } else {
    # this else branch added by RF since if not ok, lonc will
    # hang waiting on reply until timeout.
    #
    &Reply($client, "format_error\n", $userinput);
       }
       
       return 1;
   }
   &register_handler("autoinstcodeformat",
     \&get_institutional_code_format_handler,0,1,0);
   
   # Get domain specific conditions for import of student photographs to a course
   #
   # Retrieves information from photo_permission subroutine in localenroll.
   # Returns outcome (ok) if no processing errors, and whether course owner is 
   # required to accept conditions of use (yes/no).
   #
   #    
   sub photo_permission_handler {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $cdom = $tail;
       my ($perm_reqd,$conditions);
       my $outcome;
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
     \$conditions);
       };
       if (!$@) {
    &Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
          $userinput);
       } else {
    &Failure($client,"unknown_cmd\n",$userinput);
       }
       return 1;
   }
   &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
   
   #
   # Checks if student photo is available for a user in the domain, in the user's
   # directory (in /userfiles/internal/studentphoto.jpg).
   # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
   # the student's photo.   
   
   sub photo_check_handler {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my ($udom,$uname,$pid) = split(/:/,$tail);
       $udom = &unescape($udom);
       $uname = &unescape($uname);
       $pid = &unescape($pid);
       my $path=&propath($udom,$uname).'/userfiles/internal/';
       if (!-e $path) {
           &mkpath($path);
       }
       my $response;
       my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
       $result .= ':'.$response;
       &Reply($client, &escape($result)."\n",$userinput);
       return 1;
   }
   &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
   
   #
   # 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);
   
   #
   # 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.
   
   sub student_photo_handler {
       my ($cmd, $tail, $client) = @_;
       my ($domain,$uname,$ext,$type) = split(/:/, $tail);
   
       my $path=&propath($domain,$uname). '/userfiles/internal/';
       my $filename = 'studentphoto.'.$ext;
       if ($type eq 'thumbnail') {
           $filename = 'studentphoto_tn.'.$ext;
       }
       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 {
           $file=&localstudentphoto::fetch($domain,$uname);
       }
       if (!$file) {
    &Failure($client,"unavailable\n","$cmd:$tail");
    return 1;
       }
       if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
       if (-e $path.$filename) {
    &Reply($client,"ok\n","$cmd:$tail");
    return 1;
       }
       &Failure($client,"unable_to_convert\n","$cmd:$tail");
       return 1;
   }
   &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
   
   # mkpath makes all directories for a file, expects an absolute path with a
   # file or a trailing / if just a dir is passed
   # returns 1 on success 0 on failure
   sub mkpath {
       my ($file)=@_;
       my @parts=split(/\//,$file,-1);
       my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
       for (my $i=3;$i<= ($#parts-1);$i++) {
    $now.='/'.$parts[$i]; 
    if (!-e $now) {
       if  (!mkdir($now,0770)) { return 0; }
    }
       }
       return 1;
   }
   
   #---------------------------------------------------------------
   #
   #   Getting, decoding and dispatching requests:
   #
   #
   #   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 get_request {
       my $input = <$client>;
       chomp($input);
   
       &Debug("get_request: Request = $input\n");
   
       &status('Processing '.$clientname.':'.$input);
   
       return $input;
   }
   #---------------------------------------------------------------
   #
   #  Process a request.  This sub should shrink as each action
   #  gets farmed out into a separat sub that is registered 
   #  with the dispatch hash.  
   #
   # Parameters:
   #    user_input   - The request received from the client (lonc).
   # Returns:
   #    true to keep processing, false if caller should exit.
   #
   sub process_request {
       my ($userinput) = @_;      # Easier for now to break style than to
                                   # fix all the userinput -> user_input.
       my $wasenc    = 0; # True if request was encrypted.
   # ------------------------------------------------------------ See if encrypted
       # for command
       # sethost:<server>
       # <command>:<args>
       #   we just send it to the processor
       # for
       # sethost:<server>:<command>:<args>
       #  we do the implict set host and then do the command
       if ($userinput =~ /^sethost:/) {
    (my $cmd,my $newid,$userinput) = split(':',$userinput,3);
    if (defined($userinput)) {
       &sethost("$cmd:$newid");
    } else {
       $userinput = "$cmd:$newid";
    }
       }
   
       if ($userinput =~ /^enc/) {
    $userinput = decipher($userinput);
    $wasenc=1;
    if(!$userinput) { # Cipher not defined.
       &Failure($client, "error: Encrypted data without negotated key\n");
       return 0;
    }
       }
       Debug("process_request: $userinput\n");
       
       #  
       #   The 'correct way' to add a command to lond is now to
       #   write a sub to execute it and Add it to the command dispatch
       #   hash via a call to register_handler..  The comments to that
       #   sub should give you enough to go on to show how to do this
       #   along with the examples that are building up as this code
       #   is getting refactored.   Until all branches of the
       #   if/elseif monster below have been factored out into
       #   separate procesor subs, if the dispatch hash is missing
       #   the command keyword, we will fall through to the remainder
       #   of the if/else chain below in order to keep this thing in 
       #   working order throughout the transmogrification.
   
       my ($command, $tail) = split(/:/, $userinput, 2);
       chomp($command);
       chomp($tail);
       $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
       $command =~ s/(\r)//; # And this too for parameterless commands.
       if(!$tail) {
    $tail =""; # defined but blank.
       }
   
       &Debug("Command received: $command, encoded = $wasenc");
   
       if(defined $Dispatcher{$command}) {
   
    my $dispatch_info = $Dispatcher{$command};
    my $handler       = $$dispatch_info[0];
    my $need_encode   = $$dispatch_info[1];
    my $client_types  = $$dispatch_info[2];
    Debug("Matched dispatch hash: mustencode: $need_encode "
         ."ClientType $client_types");
         
    #  Validate the request:
         
    my $ok = 1;
    my $requesterprivs = 0;
    if(&isClient()) {
       $requesterprivs |= $CLIENT_OK;
    }
    if(&isManager()) {
       $requesterprivs |= $MANAGER_OK;
    }
    if($need_encode && (!$wasenc)) {
       Debug("Must encode but wasn't: $need_encode $wasenc");
       $ok = 0;
    }
    if(($client_types & $requesterprivs) == 0) {
       Debug("Client not privileged to do this operation");
       $ok = 0;
    }
   
    if($ok) {
       Debug("Dispatching to handler $command $tail");
       my $keep_going = &$handler($command, $tail, $client);
       return $keep_going;
    } else {
       Debug("Refusing to dispatch because client did not match requirements");
       Failure($client, "refused\n", $userinput);
       return 1;
    }
   
       }    
   
       print $client "unknown_cmd\n";
   # -------------------------------------------------------------------- complete
       Debug("process_request - returning 1");
       return 1;
   }
   #
   #   Decipher encoded traffic
   #  Parameters:
   #     input      - Encoded data.
   #  Returns:
   #     Decoded data or undef if encryption key was not yet negotiated.
   #  Implicit input:
   #     cipher  - This global holds the negotiated encryption key.
   #
   sub decipher {
       my ($input)  = @_;
       my $output = '';
       
       
       if($cipher) {
    my($enc, $enclength, $encinput) = split(/:/, $input);
    for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
       $output .= 
    $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
    }
    return substr($output, 0, $enclength);
       } else {
    return undef;
       }
   }
   
   #
   #   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:
   #    $request_name         - Name of the request being registered.
   #                           This is the command request that will match
   #                           against the hash keywords to lookup the information
   #                           associated with the dispatch information.
   #    $procedure           - Reference to a sub to call to process the request.
   #                           All subs get called as follows:
   #                             Procedure($cmd, $tail, $replyfd, $key)
   #                             $cmd    - the actual keyword that invoked us.
   #                             $tail   - the tail of the request that invoked us.
   #                             $replyfd- File descriptor connected to the client
   #    $must_encode          - True if the request must be encoded to be good.
   #    $client_ok            - True if it's ok for a client to request this.
   #    $manager_ok           - True if it's ok for a manager to request this.
   # Side effects:
   #      - On success, the Dispatcher hash has an entry added for the key $RequestName
   #      - On failure, the program will die as it's a bad internal bug to try to 
   #        register a duplicate command handler.
   #
   sub register_handler {
       my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok)   = @_;
   
       #  Don't allow duplication#
      
       if (defined $Dispatcher{$request_name}) {
    die "Attempting to define a duplicate request handler for $request_name\n";
       }
       #   Build the client type mask:
       
       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;
      
   }
   
   
   #------------------------------------------------------------------
   
   
   
   
 #  #
 #  Convert an error return code from lcpasswd to a string value.  #  Convert an error return code from lcpasswd to a string value.
Line 514  sub catchexception { Line 4706  sub catchexception {
     $SIG{'QUIT'}='DEFAULT';      $SIG{'QUIT'}='DEFAULT';
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
     &status("Catching exception");      &status("Catching exception");
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color='red'>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "       ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
      ."a crash with this error msg->[$error]</font>");       ."a crash with this error msg->[$error]</font>");
     &logthis('Famous last words: '.$status.' - '.$lastlog);      &logthis('Famous last words: '.$status.' - '.$lastlog);
Line 522  sub catchexception { Line 4714  sub catchexception {
     $server->close();      $server->close();
     die($error);      die($error);
 }  }
   
 sub timeout {  sub timeout {
     &status("Handling Timeout");      &status("Handling Timeout");
     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
     &catchexception('Timeout');      &catchexception('Timeout');
 }  }
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
   
   
 $SIG{'QUIT'}=\&catchexception;  $SIG{'QUIT'}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   
Line 587  sub REAPER {                        # ta Line 4779  sub REAPER {                        # ta
  if (defined($children{$pid})) {   if (defined($children{$pid})) {
     &logthis("Child $pid died");      &logthis("Child $pid died");
     delete($children{$pid});      delete($children{$pid});
  } else {   } elsif ($pid > 0) {
     &logthis("Unknown Child $pid died");      &logthis("Unknown Child $pid died");
  }   }
     } while ( $pid > 0 );      } while ( $pid > 0 );
Line 608  sub HUNTSMAN {                      # si Line 4800  sub HUNTSMAN {                      # si
     &logthis("Free socket: ".shutdown($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 618  sub HUPSMAN {                      # sig Line 4810  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 628  sub HUPSMAN {                      # sig Line 4820  sub HUPSMAN {                      # sig
 #  #
 #    Kill off hashes that describe the host table prior to re-reading it.  #    Kill off hashes that describe the host table prior to re-reading it.
 #    Hashes affected are:  #    Hashes affected are:
 #       %hostid, %hostdom %hostip  #       %hostid, %hostdom %hostip %hostdns.
 #  #
 sub KillHostHashes {  sub KillHostHashes {
     foreach my $key (keys %hostid) {      foreach my $key (keys %hostid) {
Line 640  sub KillHostHashes { Line 4832  sub KillHostHashes {
     foreach my $key (keys %hostip) {      foreach my $key (keys %hostip) {
  delete $hostip{$key};   delete $hostip{$key};
     }      }
       foreach my $key (keys %hostdns) {
    delete $hostdns{$key};
       }
 }  }
 #  #
 #   Read in the host table from file and distribute it into the various hashes:  #   Read in the host table from file and distribute it into the various hashes:
Line 650  sub KillHostHashes { Line 4845  sub KillHostHashes {
 sub ReadHostTable {  sub ReadHostTable {
   
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";      open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
           my $myloncapaname = $perlvar{'lonHostID'};
       Debug("My loncapa name is : $myloncapaname");
       my %name_to_ip;
     while (my $configline=<CONFIG>) {      while (my $configline=<CONFIG>) {
  if (!($configline =~ /^\s*\#/)) {   if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);      my ($id,$domain,$role,$name)=split(/:/,$configline);
     chomp($ip); $ip=~s/\D+$//;      $name=~s/\s//g;
     $hostid{$ip}=$id;      my $ip;
     $hostdom{$id}=$domain;      if (!exists($name_to_ip{$name})) {
     $hostip{$id}=$ip;   $ip = gethostbyname($name);
     if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }   if (!$ip || length($ip) ne 4) {
       &logthis("Skipping host $id name $name no IP found\n");
       next;
    }
    $ip=inet_ntoa($ip);
    $name_to_ip{$name} = $ip;
       } else {
    $ip = $name_to_ip{$name};
       }
       $hostid{$ip}=$id;         # LonCAPA name of host by IP.
       $hostdom{$id}=$domain;    # LonCAPA domain name of host. 
       $hostname{$id}=$name;     # LonCAPA name -> DNS name
       $hostip{$id}=$ip;         # IP address of host.
       $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
   
       if ($id eq $perlvar{'lonHostID'}) { 
    Debug("Found me in the host table: $name");
    $thisserver=$name; 
       }
  }   }
     }      }
     close(CONFIG);      close(CONFIG);
Line 721  sub checkchildren { Line 4936  sub checkchildren {
     &logthis('Going to check on the children');      &logthis('Going to check on the children');
     my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
     foreach (sort keys %children) {      foreach (sort keys %children) {
  sleep 1;   #sleep 1;
         unless (kill 'USR1' => $_) {          unless (kill 'USR1' => $_) {
     &logthis ('Child '.$_.' is dead');      &logthis ('Child '.$_.' is dead');
             &logstatus($$.' is dead');              &logstatus($$.' is dead');
       delete($children{$_});
         }           } 
     }      }
     sleep 5;      sleep 5;
     $SIG{ALRM} = sub { die "timeout" };      $SIG{ALRM} = sub { Debug("timeout"); 
          die "timeout";  };
     $SIG{__DIE__} = 'DEFAULT';      $SIG{__DIE__} = 'DEFAULT';
     &status("Checking on the children (waiting for reports)");      &status("Checking on the children (waiting for reports)");
     foreach (sort keys %children) {      foreach (sort keys %children) {
Line 742  sub checkchildren { Line 4959  sub checkchildren {
     #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;      #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
     #$execdir=$perlvar{'lonDaemons'};      #$execdir=$perlvar{'lonDaemons'};
     #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;      #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
       delete($children{$_});
     alarm(0);      alarm(0);
   }    }
         }          }
Line 749  sub checkchildren { Line 4967  sub checkchildren {
     $SIG{ALRM} = 'DEFAULT';      $SIG{ALRM} = 'DEFAULT';
     $SIG{__DIE__} = \&catchexception;      $SIG{__DIE__} = \&catchexception;
     &status("Finished checking children");      &status("Finished checking children");
       &logthis('Finished Checking children');
 }  }
   
 # --------------------------------------------------------------------- Logging  # --------------------------------------------------------------------- Logging
Line 780  sub Debug { Line 4999  sub Debug {
 #     request - Original request from client.  #     request - Original request from client.
 #  #
 sub Reply {  sub Reply {
     my $fd      = shift;      my ($fd, $reply, $request) = @_;
     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++;
   }
   
   
   #
   #    Sub to report a failure.
   #    This function:
   #     -   Increments the failure statistic counters.
   #     -   Invokes Reply to send the error message to the client.
   # Parameters:
   #    fd       - File descriptor open on the client
   #    reply    - Reply text to emit.
   #    request  - The original request message (used by Reply
   #               to debug if that's enabled.
   # Implicit outputs:
   #    $Failures- The number of failures is incremented.
   #    Reply (invoked here) sends a message to the 
   #    client:
   #
   sub Failure {
       my $fd      = shift;
       my $reply   = shift;
       my $request = shift;
      
       $Failures++;
       Reply($fd, $reply, $request);      # That's simple eh?
 }  }
 # ------------------------------------------------------------------ Log status  # ------------------------------------------------------------------ Log status
   
Line 794  sub logstatus { Line 5036  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");  
     print $fh $$."\t".$clientname."\t".$currenthostid."\t".$status."\t".$lastlog."\n";  
     $fh->close();  
     }  
     &status("Finished londstatus.txt");  
     {  
  my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");   my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
         print $fh $status."\n".$lastlog."\n".time;          print $fh $status."\n".$lastlog."\n".time."\n$keymode";
         $fh->close();          $fh->close();
     }      }
       &status("Finished $$.txt");
       {
    open(LOG,">>$docdir/lon-status/londstatus.txt");
    flock(LOG,LOCK_EX);
    print LOG $$."\t".$clientname."\t".$currenthostid."\t"
       .$status."\t".$lastlog."\t $keymode\n";
    flock(LOG,LOCK_UN);
    close(LOG);
       }
     &status("Finished logging");      &status("Finished logging");
 }  }
   
Line 830  sub status { Line 5075  sub status {
     $0='lond: '.$what.' '.$local;      $0='lond: '.$what.' '.$local;
 }  }
   
 # -------------------------------------------------------- Escape Special Chars  
   
 sub escape {  
     my $str=shift;  
     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;  
     return $str;  
 }  
   
 # ----------------------------------------------------- Un-Escape Special Chars  
   
 sub unescape {  
     my $str=shift;  
     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;  
     return $str;  
 }  
   
 # ----------------------------------------------------------- Send USR1 to lonc  # ----------------------------------------------------------- Send USR1 to lonc
   
 sub reconlonc {  sub reconlonc {
Line 860  sub reconlonc { Line 5089  sub reconlonc {
             kill USR1 => $loncpid;              kill USR1 => $loncpid;
         } else {          } else {
     &logthis(      &logthis(
               "<font color=red>CRITICAL: "                "<font color='red'>CRITICAL: "
              ."lonc at pid $loncpid not responding, giving up</font>");               ."lonc at pid $loncpid not responding, giving up</font>");
         }          }
     } else {      } else {
       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');        &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
     }      }
 }  }
   
Line 872  sub reconlonc { Line 5101  sub reconlonc {
   
 sub subreply {  sub subreply {
     my ($cmd,$server)=@_;      my ($cmd,$server)=@_;
     my $peerfile="$perlvar{'lonSockDir'}/$server";      my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
        or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "sethost:$server:$cmd\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
     if (!$answer) { $answer="con_lost"; }      if (!$answer) { $answer="con_lost"; }
Line 893  sub reply { Line 5122  sub reply {
  $answer=subreply("ping",$server);   $answer=subreply("ping",$server);
         if ($answer ne $server) {          if ($answer ne $server) {
     &logthis("sub reply: answer != server answer is $answer, server is $server");      &logthis("sub reply: answer != server answer is $answer, server is $server");
            &reconlonc("$perlvar{'lonSockDir'}/$server");             &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});
         }          }
         $answer=subreply($cmd,$server);          $answer=subreply($cmd,$server);
     }      }
Line 905  sub reply { Line 5134  sub reply {
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
   
 sub sqlreply {  sub sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $answer=subsqlreply($cmd);      my $answer=&sub_sql_reply($cmd);
     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }      if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
     return $answer;      return $answer;
 }  }
   
 sub subsqlreply {  sub sub_sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $unixsock="mysqlsock";      my $unixsock="mysqlsock";
     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";      my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
Line 920  sub subsqlreply { Line 5149  sub subsqlreply {
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
        or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "$cmd:$currentdomainid\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
     if (!$answer) { $answer="con_lost"; }      if (!$answer) { $answer="con_lost"; }
     return $answer;      return $answer;
 }  }
   
 # -------------------------------------------- Return path to profile directory  
   
 sub propath {  
     my ($udom,$uname)=@_;  
     $udom=~s/\W//g;  
     $uname=~s/\W//g;  
     my $subdir=$uname.'__';  
     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;  
     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";  
     return $proname;  
 }   
   
 # --------------------------------------- Is this the home server of an author?  # --------------------------------------- Is this the home server of an author?
   
 sub ishome {  sub ishome {
Line 968  my $execdir=$perlvar{'lonDaemons'}; Line 5185  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 986  $SIG{USR2} = \&UpdateHosts; Line 5203  $SIG{USR2} = \&UpdateHosts;
   
 ReadHostTable;  ReadHostTable;
   
   my $dist=`$perlvar{'lonDaemons'}/distprobe`;
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated  #   Accept connections.  When a connection comes in, it is validated
 #   and if good, a child process is created to process transactions  #   and if good, a child process is created to process transactions
Line 1001  while (1) { Line 5220  while (1) {
   
 sub make_new_child {  sub make_new_child {
     my $pid;      my $pid;
     my $cipher;  #    my $cipher;     # Now global
     my $sigset;      my $sigset;
   
     $client = shift;      $client = shift;
Line 1023  sub make_new_child { Line 5242  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.
Line 1047  sub make_new_child { Line 5277  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;  #        my $tmpsnum=0;            # Now global
 #---------------------------------------------------- kerberos 5 initialization  #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
         &Authen::Krb5::init_ets();   unless (($dist eq 'fedora4') || ($dist eq 'suse9.3')) {
       &Authen::Krb5::init_ets();
    }
   
  &status('Accepted connection');   &status('Accepted connection');
 # =============================================================================  # =============================================================================
             # do something with the connection              # do something with the connection
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
  # see if we know client and check for spoof IP by challenge   # see if we know client and 'check' for spoof IP by ineffective challenge
   
  ReadManagerTable; # May also be a manager!!   ReadManagerTable; # May also be a manager!!
   
  my $clientrec=($hostid{$clientip}     ne undef);   my $outsideip=$clientip;
  my $ismanager=($managers{$clientip}    ne undef);   if ($clientip eq '127.0.0.1') {
       $outsideip=$hostip{$perlvar{'lonHostID'}};
    }
   
    my $clientrec=($hostid{$outsideip}     ne undef);
    my $ismanager=($managers{$outsideip}    ne undef);
  $clientname  = "[unknonwn]";   $clientname  = "[unknonwn]";
  if($clientrec) { # Establish client type.   if($clientrec) { # Establish client type.
     $ConnectionType = "client";      $ConnectionType = "client";
     $clientname = $hostid{$clientip};      $clientname = $hostid{$outsideip};
     if($ismanager) {      if($ismanager) {
  $ConnectionType = "both";   $ConnectionType = "both";
     }      }
  } else {   } else {
     $ConnectionType = "manager";      $ConnectionType = "manager";
     $clientname = $managers{$clientip};      $clientname = $managers{$outsideip};
  }   }
  my $clientok;   my $clientok;
   
  if ($clientrec || $ismanager) {   if ($clientrec || $ismanager) {
     &status("Waiting for init from $clientip $clientname");      &status("Waiting for init from $clientip $clientname");
     &logthis('<font color="yellow">INFO: Connection, '.      &logthis('<font color="yellow">INFO: Connection, '.
Line 1081  sub make_new_child { Line 5319  sub make_new_child {
   " ($clientname) connection type = $ConnectionType </font>" );    " ($clientname) connection type = $ConnectionType </font>" );
     &status("Connecting $clientip  ($clientname))");       &status("Connecting $clientip  ($clientname))"); 
     my $remotereq=<$client>;      my $remotereq=<$client>;
     $remotereq=~s/[^\w:]//g;      chomp($remotereq);
       Debug("Got init: $remotereq");
   
     if ($remotereq =~ /^init/) {      if ($remotereq =~ /^init/) {
  &sethost("sethost:$perlvar{'lonHostID'}");   &sethost("sethost:$perlvar{'lonHostID'}");
  my $challenge="$$".time;   #
  print $client "$challenge\n";   #  If the remote is attempting a local init... give that a try:
  &status(   #
  "Waiting for challenge reply from $clientip ($clientname)");    my ($i, $inittype) = split(/:/, $remotereq);
  $remotereq=<$client>;  
  $remotereq=~s/\W//g;   # If the connection type is ssl, but I didn't get my
  if ($challenge eq $remotereq) {   # certificate files yet, then I'll drop  back to 
     $clientok=1;   # insecure (if allowed).
     print $client "ok\n";  
    if($inittype eq "ssl") {
       my ($ca, $cert) = lonssl::CertificateFile;
       my $kfile       = lonssl::KeyFile;
       if((!$ca)   || 
          (!$cert) || 
          (!$kfile)) {
    $inittype = ""; # This forces insecure attempt.
    &logthis("<font color=\"blue\"> Certificates not "
    ."installed -- trying insecure auth</font>");
       } else { # SSL certificates are in place so
       } # Leave the inittype alone.
    }
   
    if($inittype eq "local") {
       my $key = LocalConnection($client, $remotereq);
       if($key) {
    Debug("Got local key $key");
    $clientok     = 1;
    my $cipherkey = pack("H32", $key);
    $cipher       = new IDEA($cipherkey);
    print $client "ok:local\n";
    &logthis('<font color="green"'
    . "Successful local authentication </font>");
    $keymode = "local"
       } else {
    Debug("Failed to get local key");
    $clientok = 0;
    shutdown($client, 3);
    close $client;
       }
    } elsif ($inittype eq "ssl") {
       my $key = SSLConnection($client);
       if ($key) {
    $clientok = 1;
    my $cipherkey = pack("H32", $key);
    $cipher       = new IDEA($cipherkey);
    &logthis('<font color="green">'
    ."Successfull ssl authentication with $clientname </font>");
    $keymode = "ssl";
        
       } else {
    $clientok = 0;
    close $client;
       }
      
  } else {   } else {
     &logthis(      my $ok = InsecureConnection($client);
      "<font color=blue>WARNING: $clientip did not reply challenge</font>");      if($ok) {
     &status('No challenge reply '.$clientip);   $clientok = 1;
    &logthis('<font color="green">'
    ."Successful insecure authentication with $clientname </font>");
    print $client "ok\n";
    $keymode = "insecure";
       } else {
    &logthis('<font color="yellow">'
     ."Attempted insecure connection disallowed </font>");
    close $client;
    $clientok = 0;
   
       }
  }   }
     } else {      } else {
  &logthis(   &logthis(
  "<font color=blue>WARNING: "   "<font color='blue'>WARNING: "
  ."$clientip failed to initialize: >$remotereq< </font>");   ."$clientip failed to initialize: >$remotereq< </font>");
  &status('No init '.$clientip);   &status('No init '.$clientip);
     }      }
       
  } else {   } else {
     &logthis(      &logthis(
      "<font color=blue>WARNING: Unknown client $clientip</font>");       "<font color='blue'>WARNING: Unknown client $clientip</font>");
     &status('Hung up on '.$clientip);      &status('Hung up on '.$clientip);
  }   }
    
  if ($clientok) {   if ($clientok) {
 # ---------------- New known client connecting, could mean machine online again  # ---------------- New known client connecting, could mean machine online again
           
Line 1118  sub make_new_child { Line 5416  sub make_new_child {
     # no need to try to do recon's to myself      # no need to try to do recon's to myself
     next;      next;
  }   }
  &reconlonc("$perlvar{'lonSockDir'}/$id");   &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id});
     }      }
     &logthis("<font color=green>Established connection: $clientname</font>");      &logthis("<font color='green'>Established connection: $clientname</font>");
     &status('Will listen to '.$clientname);      &status('Will listen to '.$clientname);
 # ------------------------------------------------------------ Process requests  # ------------------------------------------------------------ Process requests
     while (my $userinput=<$client>) {      my $keep_going = 1;
                 chomp($userinput);      my $user_input;
  Debug("Request = $userinput\n");      while(($user_input = get_request) && $keep_going) {
                 &status('Processing '.$clientname.': '.$userinput);   alarm(120);
                 my $wasenc=0;   Debug("Main: Got $user_input\n");
                 alarm(120);   $keep_going = &process_request($user_input);
 # ------------------------------------------------------------ See if encrypted  
  if ($userinput =~ /^enc/) {  
     if ($cipher) {  
  my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);  
  $userinput='';  
  for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {  
     $userinput.=  
  $cipher->decrypt(  
  pack("H16",substr($encinput,$encidx,16))  
  );  
  }  
  $userinput=substr($userinput,0,$cmdlength);  
  $wasenc=1;  
     }  
  }  
   
 # ------------------------------------------------------------- Normal commands  
 # ------------------------------------------------------------------------ ping  
  if ($userinput =~ /^ping/) { # client only  
     if(isClient) {  
  print $client "$currenthostid\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
     }  
 # ------------------------------------------------------------------------ pong  
  }elsif ($userinput =~ /^pong/) { # client only  
     if(isClient) {  
  my $reply=&reply("ping",$clientname);  
  print $client "$currenthostid:$reply\n";   
     } else {  
  Reply($client, "refused\n", $userinput);  
     }  
 # ------------------------------------------------------------------------ ekey  
  } elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs  
     my $buildkey=time.$$.int(rand 100000);  
     $buildkey=~tr/1-6/A-F/;  
     $buildkey=int(rand 100000).$buildkey.int(rand 100000);  
     my $key=$currenthostid.$clientname;  
     $key=~tr/a-z/A-Z/;  
     $key=~tr/G-P/0-9/;  
     $key=~tr/Q-Z/0-9/;  
     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;  
     $key=substr($key,0,32);  
     my $cipherkey=pack("H32",$key);  
     $cipher=new IDEA $cipherkey;  
     print $client "$buildkey\n";   
 # ------------------------------------------------------------------------ load  
  } elsif ($userinput =~ /^load/) { # client only  
     if (isClient) {  
  my $loadavg;  
  {  
     my $loadfile=IO::File->new('/proc/loadavg');  
     $loadavg=<$loadfile>;  
  }  
  $loadavg =~ s/\s.*//g;  
  my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};  
  print $client "$loadpercent\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # -------------------------------------------------------------------- userload  
  } elsif ($userinput =~ /^userload/) { # client only  
     if(isClient) {  
  my $userloadpercent=&userload();  
  print $client "$userloadpercent\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
        
     }  
 #  
 #        Transactions requiring encryption:  
 #  
 # ----------------------------------------------------------------- currentauth  
  } elsif ($userinput =~ /^currentauth/) {  
     if (($wasenc==1)  && isClient) { # Encoded & client only.  
  my ($cmd,$udom,$uname)=split(/:/,$userinput);  
  my $result = GetAuthType($udom, $uname);  
  if($result eq "nouser") {  
     print $client "unknown_user\n";  
  }  
  else {  
     print $client "$result\n"  
     }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 #--------------------------------------------------------------------- pushfile  
  } elsif($userinput =~ /^pushfile/) { # encoded & manager.  
     if(($wasenc == 1) && isManager) {  
  my $cert = GetCertificate($userinput);  
  if(ValidManager($cert)) {  
     my $reply = PushFile($userinput);  
     print $client "$reply\n";  
  } else {  
     print $client "refused\n";  
  }   
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 #--------------------------------------------------------------------- reinit  
  } elsif($userinput =~ /^reinit/) { # Encoded and manager  
     if (($wasenc == 1) && isManager) {  
  my $cert = GetCertificate($userinput);  
  if(ValidManager($cert)) {  
     chomp($userinput);  
     my $reply = ReinitProcess($userinput);  
     print $client  "$reply\n";  
  } else {  
     print $client "refused\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
   
     }  
 # ------------------------------------------------------------------------ auth  
  } elsif ($userinput =~ /^auth/) { # Encoded and client only.  
     if (($wasenc==1) && isClient) {  
  my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);  
  chomp($upass);  
  $upass=unescape($upass);  
  my $proname=propath($udom,$uname);  
  my $passfilename="$proname/passwd";  
  if (-e $passfilename) {  
     my $pf = IO::File->new($passfilename);  
     my $realpasswd=<$pf>;  
     chomp($realpasswd);  
     my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
     my $pwdcorrect=0;  
     if ($howpwd eq 'internal') {  
  &Debug("Internal auth");  
  $pwdcorrect=  
     (crypt($upass,$contentpwd) eq $contentpwd);  
     } elsif ($howpwd eq 'unix') {  
  &Debug("Unix auth");  
  if((getpwnam($uname))[1] eq "") { #no such user!  
     $pwdcorrect = 0;  
  } else {  
     $contentpwd=(getpwnam($uname))[1];  
     my $pwauth_path="/usr/local/sbin/pwauth";  
     unless ($contentpwd eq 'x') {  
  $pwdcorrect=  
     (crypt($upass,$contentpwd) eq   
      $contentpwd);  
     }  
       
     elsif (-e $pwauth_path) {  
  open PWAUTH, "|$pwauth_path" or  
     die "Cannot invoke authentication";  
  print PWAUTH "$uname\n$upass\n";  
  close PWAUTH;  
  $pwdcorrect=!$?;  
     }  
  }  
     } 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($Authen::Krb4::error));  
  }  
     }  
  }  
     } elsif ($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);  
 #  unless ($krbreturn) {  
 #      &logthis("Krb5 Error: ".  
 #       &Authen::Krb5::error());  
 #  }  
     $pwdcorrect = ($krbreturn == 1);  
  } else { $pwdcorrect=0; }  
     } elsif ($howpwd eq 'localauth') {  
  $pwdcorrect=&localauth::localauth($uname,$upass,  
   $contentpwd);  
     }  
     if ($pwdcorrect) {  
  print $client "authorized\n";  
     } else {  
  print $client "non_authorized\n";  
     }    
  } else {  
     print $client "unknown_user\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ---------------------------------------------------------------------- passwd  
  } elsif ($userinput =~ /^passwd/) { # encoded and client  
     if (($wasenc==1) && isClient) {  
  my   
     ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);  
  chomp($npass);  
  $upass=&unescape($upass);  
  $npass=&unescape($npass);  
  &Debug("Trying to change password for $uname");  
  my $proname=propath($udom,$uname);  
  my $passfilename="$proname/passwd";  
  if (-e $passfilename) {  
     my $realpasswd;  
     { my $pf = IO::File->new($passfilename);  
       $realpasswd=<$pf>; }  
     chomp($realpasswd);  
     my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
     if ($howpwd eq 'internal') {  
  &Debug("internal auth");  
  if (crypt($upass,$contentpwd) eq $contentpwd) {  
     my $salt=time;  
     $salt=substr($salt,6,2);  
     my $ncpass=crypt($npass,$salt);  
     {  
  my $pf;  
  if ($pf = IO::File->new(">$passfilename")) {  
     print $pf "internal:$ncpass\n";  
     &logthis("Result of password change for $uname: pwchange_success");  
     print $client "ok\n";  
  } else {  
     &logthis("Unable to open $uname passwd to change password");  
     print $client "non_authorized\n";  
  }  
     }               
       
  } else {  
     print $client "non_authorized\n";  
  }  
     } elsif ($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 $uname: ".  
      &lcpasswdstrerror($?));  
     print $client "$result\n";  
  } else {  
     print $client "non_authorized\n";  
  }  
     } else {  
  print $client "auth_mode_error\n";  
     }    
  } else {  
     print $client "unknown_user\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # -------------------------------------------------------------------- makeuser  
  } elsif ($userinput =~ /^makeuser/) { # encoded and client.  
     &Debug("Make user received");  
     my $oldumask=umask(0077);  
     if (($wasenc==1) && isClient) {  
  my   
     ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);  
  &Debug("cmd =".$cmd." $udom =".$udom.  
        " uname=".$uname);  
  chomp($npass);  
  $npass=&unescape($npass);  
  my $proname=propath($udom,$uname);  
  my $passfilename="$proname/passwd";  
  &Debug("Password file created will be:".  
        $passfilename);  
  if (-e $passfilename) {  
     print $client "already_exists\n";  
  } elsif ($udom ne $currentdomainid) {  
     print $client "not_right_domain\n";  
  } else {  
     my @fpparts=split(/\//,$proname);  
     my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];  
     my $fperror='';  
     for (my $i=3;$i<=$#fpparts;$i++) {  
  $fpnow.='/'.$fpparts[$i];   
  unless (-e $fpnow) {  
     unless (mkdir($fpnow,0777)) {  
  $fperror="error: ".($!+0)  
     ." mkdir failed while attempting "  
     ."makeuser";  
     }  
  }  
     }  
     unless ($fperror) {  
  my $result=&make_passwd_file($uname, $umode,$npass,  
      $passfilename);  
  print $client $result;  
     } else {  
  print $client "$fperror\n";  
     }  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
         
     }  
     umask($oldumask);  
 # -------------------------------------------------------------- changeuserauth  
  } elsif ($userinput =~ /^changeuserauth/) { # encoded & client  
     &Debug("Changing authorization");  
     if (($wasenc==1) && isClient) {  
  my   
     ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);  
  chomp($npass);  
  &Debug("cmd = ".$cmd." domain= ".$udom.  
        "uname =".$uname." umode= ".$umode);  
  $npass=&unescape($npass);  
  my $proname=&propath($udom,$uname);  
  my $passfilename="$proname/passwd";  
  if ($udom ne $currentdomainid) {  
     print $client "not_right_domain\n";  
  } else {  
     my $result=&make_passwd_file($uname, $umode,$npass,  
  $passfilename);  
     print $client $result;  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
      
     }  
 # ------------------------------------------------------------------------ home  
  } elsif ($userinput =~ /^home/) { # client clear or encoded  
     if(isClient) {  
  my ($cmd,$udom,$uname)=split(/:/,$userinput);  
  chomp($uname);  
  my $proname=propath($udom,$uname);  
  if (-e $proname) {  
     print $client "found\n";  
  } else {  
     print $client "not_found\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ---------------------------------------------------------------------- update  
  } elsif ($userinput =~ /^update/) { # client clear or encoded.  
     if(isClient) {  
  my ($cmd,$fname)=split(/:/,$userinput);  
  my $ownership=ishome($fname);  
  if ($ownership eq 'not_owner') {  
     if (-e $fname) {  
  my ($dev,$ino,$mode,$nlink,  
     $uid,$gid,$rdev,$size,  
     $atime,$mtime,$ctime,  
     $blksize,$blocks)=stat($fname);  
  my $now=time;  
  my $since=$now-$atime;  
  if ($since>$perlvar{'lonExpire'}) {  
     my $reply=  
  &reply("unsub:$fname","$clientname");  
     unlink("$fname");  
  } else {  
     my $transname="$fname.in.transfer";  
     my $remoteurl=  
  &reply("sub:$fname","$clientname");  
     my $response;  
     {  
  my $ua=new LWP::UserAgent;  
  my $request=new HTTP::Request('GET',"$remoteurl");  
  $response=$ua->request($request,$transname);  
     }  
     if ($response->is_error()) {  
  unlink($transname);  
  my $message=$response->status_line;  
  &logthis(  
  "LWP GET: $message for $fname ($remoteurl)");  
     } else {  
  if ($remoteurl!~/\.meta$/) {  
     my $ua=new LWP::UserAgent;  
     my $mrequest=  
  new HTTP::Request('GET',$remoteurl.'.meta');  
     my $mresponse=  
  $ua->request($mrequest,$fname.'.meta');  
     if ($mresponse->is_error()) {  
  unlink($fname.'.meta');  
     }  
  }  
  rename($transname,$fname);  
     }  
  }  
  print $client "ok\n";  
     } else {  
  print $client "not_found\n";  
     }  
  } else {  
     print $client "rejected\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # -------------------------------------- fetch a user file from a remote server  
  } elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.  
     if(isClient) {  
  my ($cmd,$fname)=split(/:/,$userinput);  
  my ($udom,$uname,$ufile)=split(/\//,$fname);  
  my $udir=propath($udom,$uname).'/userfiles';  
  unless (-e $udir) { mkdir($udir,0770); }  
  if (-e $udir) {  
     $ufile=~s/^[\.\~]+//;  
     $ufile=~s/\///g;  
     my $destname=$udir.'/'.$ufile;  
     my $transname=$udir.'/'.$ufile.'.in.transit';  
     my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;  
     my $response;  
     {  
  my $ua=new LWP::UserAgent;  
  my $request=new HTTP::Request('GET',"$remoteurl");  
  $response=$ua->request($request,$transname);  
     }  
     if ($response->is_error()) {  
  unlink($transname);  
  my $message=$response->status_line;  
  &logthis("LWP GET: $message for $fname ($remoteurl)");  
  print $client "failed\n";  
     } else {  
  if (!rename($transname,$destname)) {  
     &logthis("Unable to move $transname to $destname");  
     unlink($transname);  
     print $client "failed\n";  
  } else {  
     print $client "ok\n";  
  }  
     }  
  } else {  
     print $client "not_home\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ------------------------------------------ authenticate access to a user file  
  } elsif ($userinput =~ /^tokenauthuserfile/) { # Client only  
     if(isClient) {  
  my ($cmd,$fname,$session)=split(/:/,$userinput);  
  chomp($session);  
  my $reply='non_auth';  
  if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.  
  $session.'.id')) {  
     while (my $line=<ENVIN>) {  
  if ($line=~/userfile\.$fname\=/) { $reply='ok'; }  
     }  
     close(ENVIN);  
     print $client $reply."\n";  
  } else {  
     print $client "invalid_token\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ----------------------------------------------------------------- unsubscribe  
  } elsif ($userinput =~ /^unsub/) {  
     if(isClient) {  
  my ($cmd,$fname)=split(/:/,$userinput);  
  if (-e $fname) {  
     print $client &unsub($client,$fname,$clientip);  
  } else {  
     print $client "not_found\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ------------------------------------------------------------------- subscribe  
  } elsif ($userinput =~ /^sub/) {  
     if(isClient) {  
  print $client &subscribe($userinput,$clientip);  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ------------------------------------------------------------- current version  
  } elsif ($userinput =~ /^currentversion/) {  
     if(isClient) {  
  my ($cmd,$fname)=split(/:/,$userinput);  
  print $client &currentversion($fname)."\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ------------------------------------------------------------------------- log  
  } elsif ($userinput =~ /^log/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);  
  chomp($what);  
  my $proname=propath($udom,$uname);  
  my $now=time;  
  {  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/activity.log")) {   
  print $hfh "$now:$clientname:$what\n";  
  print $client "ok\n";   
     } else {  
  print $client "error: ".($!+0)  
     ." IO::File->new Failed "  
     ."while attempting log\n";  
     }  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ------------------------------------------------------------------------- put  
  } elsif ($userinput =~ /^put/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace,$what)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  if ($namespace ne 'roles') {  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     unless ($namespace=~/^nohist\_/) {  
  my $hfh;  
  if (  
     $hfh=IO::File->new(">>$proname/$namespace.hist")  
     ) { print $hfh "P:$now:$what\n"; }  
     }  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',  
     "$proname/$namespace.db",  
     &GDBM_WRCREAT(),0640)) {  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     $hash{$key}=$value;  
  }  
  if (untie(%hash)) {  
     print $client "ok\n";  
  } else {  
     print $client "error: ".($!+0)  
  ." untie(GDBM) failed ".  
  "while attempting put\n";  
  }  
     } else {  
  print $client "error: ".($!)  
     ." tie(GDBM) Failed ".  
     "while attempting put\n";  
     }  
  } else {  
     print $client "refused\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ------------------------------------------------------------------- inc  
  } elsif ($userinput =~ /^inc:/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace,$what)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  if ($namespace ne 'roles') {  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     unless ($namespace=~/^nohist\_/) {  
  my $hfh;  
  if (  
     $hfh=IO::File->new(">>$proname/$namespace.hist")  
     ) { print $hfh "P:$now:$what\n"; }  
     }  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',  
     "$proname/$namespace.db",  
     &GDBM_WRCREAT(),0640)) {  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
                                     # We could check that we have a number...  
                                     if (! defined($value) || $value eq '') {  
                                         $value = 1;  
                                     }  
     $hash{$key}+=$value;  
  }  
  if (untie(%hash)) {  
     print $client "ok\n";  
  } else {  
     print $client "error: ".($!+0)  
  ." untie(GDBM) failed ".  
  "while attempting put\n";  
  }  
     } else {  
  print $client "error: ".($!)  
     ." tie(GDBM) Failed ".  
     "while attempting put\n";  
     }  
  } else {  
     print $client "refused\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # -------------------------------------------------------------------- rolesput  
  } elsif ($userinput =~ /^rolesput/) {  
     if(isClient) {  
  &Debug("rolesput");  
  if ($wasenc==1) {  
     my ($cmd,$exedom,$exeuser,$udom,$uname,$what)  
  =split(/:/,$userinput);  
     &Debug("cmd = ".$cmd." exedom= ".$exedom.  
    "user = ".$exeuser." udom=".$udom.  
    "what = ".$what);  
     my $namespace='roles';  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     {  
  my $hfh;  
  if (  
     $hfh=IO::File->new(">>$proname/$namespace.hist")  
     ) {   
     print $hfh "P:$now:$exedom:$exeuser:$what\n";  
  }  
     }  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     &ManagePermissions($key, $udom, $uname,  
        &GetAuthType( $udom,   
      $uname));  
     $hash{$key}=$value;  
  }  
  if (untie(%hash)) {  
     print $client "ok\n";  
  } else {  
     print $client "error: ".($!+0)  
  ." untie(GDBM) Failed ".  
  "while attempting rolesput\n";  
  }  
     } else {  
  print $client "error: ".($!+0)  
     ." tie(GDBM) Failed ".  
     "while attempting rolesput\n";  
     }  
  } else {  
     print $client "refused\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
     
     }  
 # -------------------------------------------------------------------- rolesdel  
  } elsif ($userinput =~ /^rolesdel/) {  
     if(isClient) {  
  &Debug("rolesdel");  
  if ($wasenc==1) {  
     my ($cmd,$exedom,$exeuser,$udom,$uname,$what)  
  =split(/:/,$userinput);  
     &Debug("cmd = ".$cmd." exedom= ".$exedom.  
    "user = ".$exeuser." udom=".$udom.  
    "what = ".$what);  
     my $namespace='roles';  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     {  
  my $hfh;  
  if (  
     $hfh=IO::File->new(">>$proname/$namespace.hist")  
     ) {   
     print $hfh "D:$now:$exedom:$exeuser:$what\n";  
  }  
     }  
     my @rolekeys=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
  foreach my $key (@rolekeys) {  
     delete $hash{$key};  
  }  
  if (untie(%hash)) {  
     print $client "ok\n";  
  } else {  
     print $client "error: ".($!+0)  
  ." untie(GDBM) Failed ".  
  "while attempting rolesdel\n";  
  }  
     } else {  
  print $client "error: ".($!+0)  
     ." tie(GDBM) Failed ".  
     "while attempting rolesdel\n";  
     }  
  } else {  
     print $client "refused\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
         
     }  
 # ------------------------------------------------------------------------- get  
  } elsif ($userinput =~ /^get/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace,$what)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  chomp($what);  
  my @queries=split(/\&/,$what);  
  my $proname=propath($udom,$uname);  
  my $qresult='';  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
     for (my $i=0;$i<=$#queries;$i++) {  
  $qresult.="$hash{$queries[$i]}&";  
     }  
     if (untie(%hash)) {  
  $qresult=~s/\&$//;  
  print $client "$qresult\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting get\n";  
     }  
  } else {  
     if ($!+0 == 2) {  
  print $client "error:No such file or ".  
     "GDBM reported bad block error\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." tie(GDBM) Failed ".  
     "while attempting get\n";  
     }  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ------------------------------------------------------------------------ eget  
  } elsif ($userinput =~ /^eget/) {  
     if (isClient) {  
  my ($cmd,$udom,$uname,$namespace,$what)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  chomp($what);  
  my @queries=split(/\&/,$what);  
  my $proname=propath($udom,$uname);  
  my $qresult='';  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
     for (my $i=0;$i<=$#queries;$i++) {  
  $qresult.="$hash{$queries[$i]}&";  
     }  
     if (untie(%hash)) {  
  $qresult=~s/\&$//;  
  if ($cipher) {  
     my $cmdlength=length($qresult);  
     $qresult.="         ";  
     my $encqresult='';  
     for   
  (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {  
     $encqresult.=  
  unpack("H16",  
        $cipher->encrypt(substr($qresult,$encidx,8)));  
  }  
     print $client "enc:$cmdlength:$encqresult\n";  
  } else {  
     print $client "error:no_key\n";  
  }  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting eget\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting eget\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
       
     }  
 # ------------------------------------------------------------------------- del  
  } elsif ($userinput =~ /^del/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace,$what)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  chomp($what);  
  my $proname=propath($udom,$uname);  
  my $now=time;  
  unless ($namespace=~/^nohist\_/) {  
     my $hfh;  
     if (  
  $hfh=IO::File->new(">>$proname/$namespace.hist")  
  ) { print $hfh "D:$now:$what\n"; }  
  }  
  my @keys=split(/\&/,$what);  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
     foreach my $key (@keys) {  
  delete($hash{$key});  
     }  
     if (untie(%hash)) {  
  print $client "ok\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting del\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting del\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
   
     }  
 # ------------------------------------------------------------------------ keys  
  } elsif ($userinput =~ /^keys/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  my $proname=propath($udom,$uname);  
  my $qresult='';  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
     foreach my $key (keys %hash) {  
  $qresult.="$key&";  
     }  
     if (untie(%hash)) {  
  $qresult=~s/\&$//;  
  print $client "$qresult\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting keys\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting keys\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
      
     }  
 # ----------------------------------------------------------------- dumpcurrent  
  } elsif ($userinput =~ /^currentdump/) {  
     if (isClient) {  
  my ($cmd,$udom,$uname,$namespace)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  my $qresult='';  
  my $proname=propath($udom,$uname);  
  my %hash;  
  if (tie(%hash,'GDBM_File',  
  "$proname/$namespace.db",  
  &GDBM_READER(),0640)) {  
     # Structure of %data:  
     # $data{$symb}->{$parameter}=$value;  
     # $data{$symb}->{'v.'.$parameter}=$version;  
     # since $parameter will be unescaped, we do not  
     # have to worry about silly parameter names...  
     my %data = ();  
     while (my ($key,$value) = each(%hash)) {  
  my ($v,$symb,$param) = split(/:/,$key);  
  next if ($v eq 'version' || $symb eq 'keys');  
  next if (exists($data{$symb}) &&   
  exists($data{$symb}->{$param}) &&  
  $data{$symb}->{'v.'.$param} > $v);  
  $data{$symb}->{$param}=$value;  
  $data{$symb}->{'v.'.$param}=$v;  
     }  
     if (untie(%hash)) {  
  while (my ($symb,$param_hash) = each(%data)) {  
     while(my ($param,$value) = each (%$param_hash)){  
  next if ($param =~ /^v\./);  
  $qresult.=$symb.':'.$param.'='.$value.'&';  
     }  
  }  
  chop($qresult);  
  print $client "$qresult\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting currentdump\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting currentdump\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
     }  
 # ------------------------------------------------------------------------ dump  
  } elsif ($userinput =~ /^dump/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace,$regexp)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  if (defined($regexp)) {  
     $regexp=&unescape($regexp);  
  } else {  
     $regexp='.';  
  }  
  my $qresult='';  
  my $proname=propath($udom,$uname);  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
        study($regexp);  
        while (my ($key,$value) = each(%hash)) {  
    if ($regexp eq '.') {  
        $qresult.=$key.'='.$value.'&';  
    } else {  
        my $unescapeKey = &unescape($key);  
        if (eval('$unescapeKey=~/$regexp/')) {  
    $qresult.="$key=$value&";  
        }  
    }  
        }  
        if (untie(%hash)) {  
    chop($qresult);  
    print $client "$qresult\n";  
        } else {  
    print $client "error: ".($!+0)  
        ." untie(GDBM) Failed ".  
                                        "while attempting dump\n";  
        }  
    } else {  
        print $client "error: ".($!+0)  
    ." tie(GDBM) Failed ".  
    "while attempting dump\n";  
    }  
     } else {  
  Reply($client, "refused\n", $userinput);  
     
     }  
 # ----------------------------------------------------------------------- store  
  } elsif ($userinput =~ /^store/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace,$rid,$what)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  if ($namespace ne 'roles') {  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     unless ($namespace=~/^nohist\_/) {  
  my $hfh;  
  if (  
     $hfh=IO::File->new(">>$proname/$namespace.hist")  
     ) { print $hfh "P:$now:$rid:$what\n"; }  
     }  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
  my @previouskeys=split(/&/,$hash{"keys:$rid"});  
  my $key;  
  $hash{"version:$rid"}++;  
  my $version=$hash{"version:$rid"};  
  my $allkeys='';   
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     $allkeys.=$key.':';  
     $hash{"$version:$rid:$key"}=$value;  
  }  
  $hash{"$version:$rid:timestamp"}=$now;  
  $allkeys.='timestamp';  
  $hash{"$version:keys:$rid"}=$allkeys;  
  if (untie(%hash)) {  
     print $client "ok\n";  
  } else {  
     print $client "error: ".($!+0)  
  ." untie(GDBM) Failed ".  
  "while attempting store\n";  
  }  
     } else {  
  print $client "error: ".($!+0)  
     ." tie(GDBM) Failed ".  
     "while attempting store\n";  
     }  
  } else {  
     print $client "refused\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
        
     }  
 # --------------------------------------------------------------------- restore  
  } elsif ($userinput =~ /^restore/) {  
     if(isClient) {  
  my ($cmd,$udom,$uname,$namespace,$rid)  
     =split(/:/,$userinput);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  chomp($rid);  
  my $proname=propath($udom,$uname);  
  my $qresult='';  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
     my $version=$hash{"version:$rid"};  
     $qresult.="version=$version&";  
     my $scope;  
     for ($scope=1;$scope<=$version;$scope++) {  
  my $vkeys=$hash{"$scope:keys:$rid"};  
  my @keys=split(/:/,$vkeys);  
  my $key;  
  $qresult.="$scope:keys=$vkeys&";  
  foreach $key (@keys) {  
     $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";  
  }                                    
     }  
     if (untie(%hash)) {  
  $qresult=~s/\&$//;  
  print $client "$qresult\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting restore\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting restore\n";  
  }  
     } else  {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # -------------------------------------------------------------------- chatsend  
  } elsif ($userinput =~ /^chatsend/) {  
     if(isClient) {  
  my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);  
  &chatadd($cdom,$cnum,$newpost);  
  print $client "ok\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
         
     }  
 # -------------------------------------------------------------------- chatretr  
  } elsif ($userinput =~ /^chatretr/) {  
     if(isClient) {  
  my   
     ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);  
  my $reply='';  
  foreach (&getchat($cdom,$cnum,$udom,$uname)) {  
     $reply.=&escape($_).':';  
  }  
  $reply=~s/\:$//;  
  print $client $reply."\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ------------------------------------------------------------------- querysend  
  } elsif ($userinput =~ /^querysend/) {  
     if(isClient) {  
  my ($cmd,$query,  
     $arg1,$arg2,$arg3)=split(/\:/,$userinput);  
  $query=~s/\n*$//g;  
  print $client "".  
     sqlreply("$clientname\&$query".  
      "\&$arg1"."\&$arg2"."\&$arg3")."\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
         
     }  
 # ------------------------------------------------------------------ queryreply  
  } elsif ($userinput =~ /^queryreply/) {  
     if(isClient) {  
  my ($cmd,$id,$reply)=split(/:/,$userinput);   
  my $store;  
  my $execdir=$perlvar{'lonDaemons'};  
  if ($store=IO::File->new(">$execdir/tmp/$id")) {  
     $reply=~s/\&/\n/g;  
     print $store $reply;  
     close $store;  
     my $store2=IO::File->new(">$execdir/tmp/$id.end");  
     print $store2 "done\n";  
     close $store2;  
     print $client "ok\n";  
  }  
  else {  
     print $client "error: ".($!+0)  
  ." IO::File->new Failed ".  
  "while attempting queryreply\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
        
     }  
 # ----------------------------------------------------------------- courseidput  
  } elsif ($userinput =~ /^courseidput/) {  
     if(isClient) {  
  my ($cmd,$udom,$what)=split(/:/,$userinput);  
  chomp($what);  
  $udom=~s/\W//g;  
  my $proname=  
     "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";  
  my $now=time;  
  my @pairs=split(/\&/,$what);  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {  
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  $hash{$key}=$value.':'.$now;  
     }  
     if (untie(%hash)) {  
  print $client "ok\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting courseidput\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting courseidput\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ---------------------------------------------------------------- courseiddump  
  } elsif ($userinput =~ /^courseiddump/) {  
     if(isClient) {  
  my ($cmd,$udom,$since,$description)  
     =split(/:/,$userinput);  
  if (defined($description)) {  
     $description=&unescape($description);  
  } else {  
     $description='.';  
  }  
  unless (defined($since)) { $since=0; }  
  my $qresult='';  
  my $proname=  
     "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {  
     while (my ($key,$value) = each(%hash)) {  
  my ($descr,$lasttime)=split(/\:/,$value);  
  if ($lasttime<$since) { next; }  
  if ($description eq '.') {  
     $qresult.=$key.'='.$descr.'&';  
  } else {  
     my $unescapeVal = &unescape($descr);  
     if (eval('$unescapeVal=~/$description/i')) {  
  $qresult.="$key=$descr&";  
     }  
  }  
     }  
     if (untie(%hash)) {  
  chop($qresult);  
  print $client "$qresult\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting courseiddump\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting courseiddump\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ----------------------------------------------------------------------- idput  
  } elsif ($userinput =~ /^idput/) {  
     if(isClient) {  
  my ($cmd,$udom,$what)=split(/:/,$userinput);  
  chomp($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 %hash;  
  if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {  
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  $hash{$key}=$value;  
     }  
     if (untie(%hash)) {  
  print $client "ok\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting idput\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting idput\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ----------------------------------------------------------------------- idget  
  } elsif ($userinput =~ /^idget/) {  
     if(isClient) {  
  my ($cmd,$udom,$what)=split(/:/,$userinput);  
  chomp($what);  
  $udom=~s/\W//g;  
  my $proname="$perlvar{'lonUsersDir'}/$udom/ids";  
  my @queries=split(/\&/,$what);  
  my $qresult='';  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {  
     for (my $i=0;$i<=$#queries;$i++) {  
  $qresult.="$hash{$queries[$i]}&";  
     }  
     if (untie(%hash)) {  
  $qresult=~s/\&$//;  
  print $client "$qresult\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) Failed ".  
     "while attempting idget\n";  
     }  
  } else {  
     print $client "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting idget\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ---------------------------------------------------------------------- tmpput  
  } elsif ($userinput =~ /^tmpput/) {  
     if(isClient) {  
  my ($cmd,$what)=split(/:/,$userinput);  
  my $store;  
  $tmpsnum++;  
  my $id=$$.'_'.$clientip.'_'.$tmpsnum;  
  $id=~s/\W/\_/g;  
  $what=~s/\n//g;  
  my $execdir=$perlvar{'lonDaemons'};  
  if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {  
     print $store $what;  
     close $store;  
     print $client "$id\n";  
  }  
  else {  
     print $client "error: ".($!+0)  
  ."IO::File->new Failed ".  
  "while attempting tmpput\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
       
     }  
       
 # ---------------------------------------------------------------------- tmpget  
  } elsif ($userinput =~ /^tmpget/) {  
     if(isClient) {  
  my ($cmd,$id)=split(/:/,$userinput);  
  chomp($id);  
  $id=~s/\W/\_/g;  
  my $store;  
  my $execdir=$perlvar{'lonDaemons'};  
  if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {  
     my $reply=<$store>;  
     print $client "$reply\n";  
     close $store;  
  }  
  else {  
     print $client "error: ".($!+0)  
  ."IO::File->new Failed ".  
  "while attempting tmpget\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
         
     }  
 # ---------------------------------------------------------------------- tmpdel  
  } elsif ($userinput =~ /^tmpdel/) {  
     if(isClient) {  
  my ($cmd,$id)=split(/:/,$userinput);  
  chomp($id);  
  $id=~s/\W/\_/g;  
  my $execdir=$perlvar{'lonDaemons'};  
  if (unlink("$execdir/tmp/$id.tmp")) {  
     print $client "ok\n";  
  } else {  
     print $client "error: ".($!+0)  
  ."Unlink tmp Failed ".  
  "while attempting tmpdel\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
        
     }  
 # -------------------------------------------------------------------------- ls  
  } elsif ($userinput =~ /^ls/) {  
     if(isClient) {  
  my ($cmd,$ulsdir)=split(/:/,$userinput);  
  my $ulsout='';  
  my $ulsfn;  
  if (-e $ulsdir) {  
     if(-d $ulsdir) {  
  if (opendir(LSDIR,$ulsdir)) {  
     while ($ulsfn=readdir(LSDIR)) {  
  my @ulsstats=stat($ulsdir.'/'.$ulsfn);  
  $ulsout.=$ulsfn.'&'.  
     join('&',@ulsstats).':';  
     }  
     closedir(LSDIR);  
  }  
     } else {  
  my @ulsstats=stat($ulsdir);  
  $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';  
     }  
  } else {  
     $ulsout='no_such_dir';  
  }  
  if ($ulsout eq '') { $ulsout='empty'; }  
  print $client "$ulsout\n";  
     } else {  
  Reply($client, "refused\n", $userinput);  
        
     }  
 # ----------------------------------------------------------------- setannounce  
  } elsif ($userinput =~ /^setannounce/) {  
     if (isClient) {  
  my ($cmd,$announcement)=split(/:/,$userinput);  
  chomp($announcement);  
  $announcement=&unescape($announcement);  
  if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.  
     '/announcement.txt')) {  
     print $store $announcement;  
     close $store;  
     print $client "ok\n";  
  } else {  
     print $client "error: ".($!+0)."\n";  
  }  
     } else {  
  Reply($client, "refused\n", $userinput);  
          
     }  
 # ------------------------------------------------------------------ Hanging up  
  } elsif (($userinput =~ /^exit/) ||  
  ($userinput =~ /^init/)) { # no restrictions.  
     &logthis(  
      "Client $clientip ($clientname) hanging up: $userinput");  
     print $client "bye\n";  
     $client->shutdown(2);        # shutdown the socket forcibly.  
     $client->close();  
     last;  
   
 # ---------------------------------- set current host/domain  
  } elsif ($userinput =~ /^sethost:/) {  
     if (isClient) {  
  print $client &sethost($userinput)."\n";  
     } else {  
  print $client "refused\n";  
     }  
 #---------------------------------- request file (?) version.  
  } elsif ($userinput =~/^version:/) {  
     if (isClient) {  
  print $client &version($userinput)."\n";  
     } else {  
  print $client "refused\n";  
     }  
 # ------------------------------------------------------------- unknown command  
   
  } else {  
     # unknown command  
     print $client "unknown_cmd\n";  
  }  
 # -------------------------------------------------------------------- complete  
  alarm(0);   alarm(0);
  &status('Listening to '.$clientname);   &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 2578  sub make_new_child { Line 5452  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($value);
   }
 #  #
 #   Checks to see if the input roleput request was to set  #   Checks to see if the input roleput request was to set
 # an author role.  If so, invokes the lchtmldir script to set  # an author role.  If so, invokes the lchtmldir script to set
Line 2591  sub make_new_child { Line 5495  sub make_new_child {
 #    user      - Name of the user for which the role is being put.  #    user      - Name of the user for which the role is being put.
 #    authtype  - The authentication type associated with the user.  #    authtype  - The authentication type associated with the user.
 #  #
 sub ManagePermissions  sub manage_permissions {
 {      my ($request, $domain, $user, $authtype) = @_;
     my $request = shift;  
     my $domain  = shift;      &Debug("manage_permissions: $request $domain $user $authtype");
     my $user    = shift;  
     my $authtype= shift;  
   
     # See if the request is of the form /$domain/_au      # See if the request is of the form /$domain/_au
     &logthis("ruequest is $request");      if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...  
  my $execdir = $perlvar{'lonDaemons'};   my $execdir = $perlvar{'lonDaemons'};
  my $userhome= "/home/$user" ;   my $userhome= "/home/$user" ;
  &logthis("system $execdir/lchtmldir $userhome $user $authtype");   &logthis("system $execdir/lchtmldir $userhome $user $authtype");
    &Debug("Setting homedir permissions for $userhome");
  system("$execdir/lchtmldir $userhome $user $authtype");   system("$execdir/lchtmldir $userhome $user $authtype");
     }      }
 }  }
   
   
   #
   #  Return the full path of a user password file, whether it exists or not.
   # Parameters:
   #   domain     - Domain in which the password file lives.
   #   user       - name of the user.
   # Returns:
   #    Full passwd path:
   #
   sub password_path {
       my ($domain, $user) = @_;
       return &propath($domain, $user).'/passwd';
   }
   
   #   Password Filename
   #   Returns the path to a passwd file given domain and user... only if
   #  it exists.
   # Parameters:
   #   domain    - Domain in which to search.
   #   user      - username.
   # Returns:
   #   - If the password file exists returns its path.
   #   - If the password file does not exist, returns undefined.
   #
   sub password_filename {
       my ($domain, $user) = @_;
   
       Debug ("PasswordFilename called: dom = $domain user = $user");
   
       my $path  = &password_path($domain, $user);
       Debug("PasswordFilename got path: $path");
       if(-e $path) {
    return $path;
       } else {
    return undef;
       }
   }
   
   #
   #   Rewrite the contents of the user's passwd file.
   #  Parameters:
   #    domain    - domain of the user.
   #    name      - User's name.
   #    contents  - New contents of the file.
   # Returns:
   #   0    - Failed.
   #   1    - Success.
   #
   sub rewrite_password_file {
       my ($domain, $user, $contents) = @_;
   
       my $file = &password_filename($domain, $user);
       if (defined $file) {
    my $pf = IO::File->new(">$file");
    if($pf) {
       print $pf "$contents\n";
       return 1;
    } else {
       return 0;
    }
       } else {
    return 0;
       }
   
   }
   
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  #   get_auth_type - Determines the authorization type of a user in a domain.
   
 #     Returns the authorization type or nouser if there is no such user.  #     Returns the authorization type or nouser if there is no such user.
 #  #
 sub GetAuthType   sub get_auth_type 
 {  {
     my $domain = shift;  
     my $user   = shift;  
   
     Debug("GetAuthType( $domain, $user ) \n");      my ($domain, $user)  = @_;
   
       Debug("get_auth_type( $domain, $user ) \n");
     my $proname    = &propath($domain, $user);       my $proname    = &propath($domain, $user); 
     my $passwdfile = "$proname/passwd";      my $passwdfile = "$proname/passwd";
     if( -e $passwdfile ) {      if( -e $passwdfile ) {
Line 2627  sub GetAuthType Line 5596  sub GetAuthType
  Debug("Password info = $realpassword\n");   Debug("Password info = $realpassword\n");
  my ($authtype, $contentpwd) = split(/:/, $realpassword);   my ($authtype, $contentpwd) = split(/:/, $realpassword);
  Debug("Authtype = $authtype, content = $contentpwd\n");   Debug("Authtype = $authtype, content = $contentpwd\n");
  my $availinfo = '';   return "$authtype:$contentpwd";     
  if($authtype eq 'krb4' or $authtype eq 'krb5') {      } else {
     $availinfo = $contentpwd;  
  }  
   
  return "$authtype:$availinfo";  
     }  
     else {  
  Debug("Returning nouser");   Debug("Returning nouser");
  return "nouser";   return "nouser";
     }      }
 }  }
   
   #
   #  Validate a user given their domain, name and password.  This utility
   #  function is used by both  AuthenticateHandler and ChangePasswordHandler
   #  to validate the login credentials of a user.
   # Parameters:
   #    $domain    - The domain being logged into (this is required due to
   #                 the capability for multihomed systems.
   #    $user      - The name of the user being validated.
   #    $password  - The user's propoposed password.
   #
   # Returns:
   #     1        - The domain,user,pasword triplet corresponds to a valid
   #                user.
   #     0        - The domain,user,password triplet is not a valid user.
   #
   sub validate_user {
       my ($domain, $user, $password) = @_;
   
   
       # Why negative ~pi you may well ask?  Well this function is about
       # authentication, and therefore very important to get right.
       # I've initialized the flag that determines whether or not I've 
       # validated correctly to a value it's not supposed to get.
       # At the end of this function. I'll ensure that it's not still that
       # value so we don't just wind up returning some accidental value
       # as a result of executing an unforseen code path that
       # did not set $validated.  At the end of valid execution paths,
       # validated shoule be 1 for success or 0 for failuer.
   
       my $validated = -3.14159;
   
       #  How we authenticate is determined by the type of authentication
       #  the user has been assigned.  If the authentication type is
       #  "nouser", the user does not exist so we will return 0.
   
       my $contents = &get_auth_type($domain, $user);
       my ($howpwd, $contentpwd) = split(/:/, $contents);
   
       my $null = pack("C",0); # Used by kerberos auth types.
   
       if ($howpwd ne 'nouser') {
   
    if($howpwd eq "internal") { # Encrypted is in local password file.
       $validated = (crypt($password, $contentpwd) eq $contentpwd);
    }
    elsif ($howpwd eq "unix") { # User is a normal unix user.
       $contentpwd = (getpwnam($user))[1];
       if($contentpwd) {
    if($contentpwd eq 'x') { # Shadow password file...
       my $pwauth_path = "/usr/local/sbin/pwauth";
       open PWAUTH,  "|$pwauth_path" or
    die "Cannot invoke authentication";
       print PWAUTH "$user\n$password\n";
       close PWAUTH;
       $validated = ! $?;
   
    } else {         # Passwords in /etc/passwd. 
       $validated = (crypt($password,
    $contentpwd) eq $contentpwd);
    }
       } else {
    $validated = 0;
       }
    }
    elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
       if(! ($password =~ /$null/) ) {
    my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
      "",
      $contentpwd,,
      'krbtgt',
      $contentpwd,
      1,
      $password);
    if(!$k4error) {
       $validated = 1;
    } else {
       $validated = 0;
       &logthis('krb4: '.$user.', '.$contentpwd.', '.
        &Authen::Krb4::get_err_txt($Authen::Krb4::error));
    }
       } else {
    $validated = 0; # Password has a match with null.
       }
    } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
       if(!($password =~ /$null/)) { # Null password not allowed.
    my $krbclient = &Authen::Krb5::parse_name($user.'@'
     .$contentpwd);
    my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
    my $krbserver  = &Authen::Krb5::parse_name($krbservice);
    my $credentials= &Authen::Krb5::cc_default();
    $credentials->initialize($krbclient);
    my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
    $krbserver,
    $password,
    $credentials);
    $validated = ($krbreturn == 1);
       } else {
    $validated = 0;
       }
    } elsif ($howpwd eq "localauth") { 
       #  Authenticate via installation specific authentcation method:
       $validated = &localauth::localauth($user, 
          $password, 
          $contentpwd);
    } else { # Unrecognized auth is also bad.
       $validated = 0;
    }
       } else {
    $validated = 0;
       }
       #
       #  $validated has the correct stat of the authentication:
       #
   
       unless ($validated != -3.14159) {
    #  I >really really< want to know if this happens.
    #  since it indicates that user authentication is badly
    #  broken in some code path.
           #
    die "ValidateUser - failed to set the value of validated $domain, $user $password";
       }
       return $validated;
   }
   
   
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
Line 2660  sub addline { Line 5748  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 2703  sub chatadd { Line 5803  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 2787  sub thisversion { Line 5907  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 2831  sub subscribe { Line 5951  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,$passfilename)=@_;
Line 2838  sub make_passwd_file { Line 5987  sub make_passwd_file {
     if ($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 2847  sub make_passwd_file { Line 6000  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') {
  {   {
Line 2866  sub make_passwd_file { Line 6027  sub make_passwd_file {
  return "no_priv_account_error\n";   return "no_priv_account_error\n";
     }      }
   
     my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";      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 2874  sub make_passwd_file { Line 6037  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 2893  sub make_passwd_file { Line 6080  sub make_passwd_file {
     return $result;      return $result;
 }  }
   
   sub convert_photo {
       my ($start,$dest)=@_;
       system("convert $start $dest");
   }
   
 sub sethost {  sub sethost {
     my ($remotereq) = @_;      my ($remotereq) = @_;
     my (undef,$hostid)=split(/:/,$remotereq);      my (undef,$hostid)=split(/:/,$remotereq);
       # ignore sethost if we are already correct
       if ($hostid eq $currenthostid) {
    return 'ok';
       }
   
     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {      if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
  $currenthostid=$hostid;   $currenthostid  =$hostid;
  $currentdomainid=$hostdom{$hostid};   $currentdomainid=$hostdom{$hostid};
  &logthis("Setting hostid to $hostid, and domain to $currentdomainid");   &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {      } else {
Line 2938  sub userload { Line 6135  sub userload {
     return $userloadpercent;      return $userloadpercent;
 }  }
   
   # Routines for serializing arrays and hashes (copies from lonnet)
   
   sub array2str {
     my (@array) = @_;
     my $result=&arrayref2str(\@array);
     $result=~s/^__ARRAY_REF__//;
     $result=~s/__END_ARRAY_REF__$//;
     return $result;
   }
                                                                                    
   sub arrayref2str {
     my ($arrayref) = @_;
     my $result='__ARRAY_REF__';
     foreach my $elem (@$arrayref) {
       if(ref($elem) eq 'ARRAY') {
         $result.=&arrayref2str($elem).'&';
       } elsif(ref($elem) eq 'HASH') {
         $result.=&hashref2str($elem).'&';
       } elsif(ref($elem)) {
         #print("Got a ref of ".(ref($elem))." skipping.");
       } else {
         $result.=&escape($elem).'&';
       }
     }
     $result=~s/\&$//;
     $result .= '__END_ARRAY_REF__';
     return $result;
   }
                                                                                    
   sub hash2str {
     my (%hash) = @_;
     my $result=&hashref2str(\%hash);
     $result=~s/^__HASH_REF__//;
     $result=~s/__END_HASH_REF__$//;
     return $result;
   }
                                                                                    
   sub hashref2str {
     my ($hashref)=@_;
     my $result='__HASH_REF__';
     foreach (sort(keys(%$hashref))) {
       if (ref($_) eq 'ARRAY') {
         $result.=&arrayref2str($_).'=';
       } elsif (ref($_) eq 'HASH') {
         $result.=&hashref2str($_).'=';
       } elsif (ref($_)) {
         $result.='=';
         #print("Got a ref of ".(ref($_))." skipping.");
       } else {
           if ($_) {$result.=&escape($_).'=';} else { last; }
       }
   
       if(ref($hashref->{$_}) eq 'ARRAY') {
         $result.=&arrayref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_}) eq 'HASH') {
         $result.=&hashref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_})) {
          $result.='&';
         #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
       } else {
         $result.=&escape($hashref->{$_}).'&';
       }
     }
     $result=~s/\&$//;
     $result .= '__END_HASH_REF__';
     return $result;
   }
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  # ----------------------------------- POD (plain old documentation, CPAN style)
   
 =head1 NAME  =head1 NAME
Line 3145  Place in B<logs/lond.log> Line 6410  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 3253  to the client, and the connection is clo Line 6518  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.1.165.2.4  
changed lines
  Added in v.1.337


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