Diff for /loncom/lond between versions 1.211 and 1.453

version 1.211, 2004/07/23 16:14:19 version 1.453, 2010/08/22 03:44:12
Line 31 Line 31
   
 use strict;  use strict;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
   use LONCAPA;
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
   
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
 #use Apache::File;  #use Apache::File;
 use Symbol;  
 use POSIX;  use POSIX;
 use Crypt::IDEA;  use Crypt::IDEA;
 use LWP::UserAgent();  use LWP::UserAgent();
   use Digest::MD5 qw(md5_hex);
 use GDBM_File;  use GDBM_File;
 use Authen::Krb4;  
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  
 use localauth;  use localauth;
 use localenroll;  use localenroll;
   use localstudentphoto;
 use File::Copy;  use File::Copy;
 use LONCAPA::ConfigFileEdit;  use File::Find;
 use LONCAPA::lonlocal;  use LONCAPA::lonlocal;
 use LONCAPA::lonssl;  use LONCAPA::lonssl;
   use Fcntl qw(:flock);
   use Apache::lonnet;
   
 my $DEBUG = 0;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
Line 58  my $lastlog=''; Line 60  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; # IP address of client.  my $clientip; # IP address of client.
 my $clientdns; # DNS name of client.  
 my $clientname; # LonCAPA name of client.  my $clientname; # LonCAPA name of client.
   my $clientversion;              # LonCAPA version running on client.
   my $clienthomedom;              # LonCAPA domain of homeID for client. 
                                   # primary library server. 
   
 my $server;  my $server;
 my $thisserver; # DNS of us.  
   
 my $keymode;  my $keymode;
   
Line 83  my $tmpsnum = 0;  # Id of tmpputs. Line 86  my $tmpsnum = 0;  # Id of tmpputs.
   
 my $ConnectionType;  my $ConnectionType;
   
 my %hostid; # ID's for hosts in cluster by ip.  
 my %hostdom; # LonCAPA domain for hosts in cluster.  
 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.
Line 111  my %Dispatcher; Line 109  my %Dispatcher;
 #  #
 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 137  my @adderrors    = ("ok", Line 137  my @adderrors    = ("ok",
     "lcuseradd Unable to make www member of users's group",      "lcuseradd Unable to make www member of users's group",
     "lcuseradd Unable to su to root",      "lcuseradd Unable to su to root",
     "lcuseradd Unable to set password",      "lcuseradd Unable to set password",
     "lcuseradd Usrname has invalid characters",      "lcuseradd Username has invalid characters",
     "lcuseradd Password has an invalid character",      "lcuseradd Password has an invalid character",
     "lcuseradd User already exists",      "lcuseradd User already exists",
     "lcuseradd Could not add user.",      "lcuseradd Could not add user.",
     "lcuseradd Password mismatch");      "lcuseradd Password mismatch");
   
   
   # This array are the errors from lcinstallfile:
   
   my @installerrors = ("ok",
        "Initial user id of client not that of www",
        "Usage error, not enough command line arguments",
        "Source file name does not exist",
        "Destination file name does not exist",
        "Some file operation failed",
        "Invalid table filename."
        );
   
 #  #
 #   Statistics that are maintained and dislayed in the status line.  #   Statistics that are maintained and dislayed in the status line.
 #  #
 my $Transactions; # Number of attempted transactions.  my $Transactions = 0; # Number of attempted transactions.
 my $Failures; # Number of transcations failed.  my $Failures     = 0; # Number of transcations failed.
   
 #   ResetStatistics:   #   ResetStatistics: 
 #      Resets the statistics counters:  #      Resets the statistics counters:
Line 159  sub ResetStatistics { Line 169  sub ResetStatistics {
     $Failures     = 0;      $Failures     = 0;
 }  }
   
   
   
 #------------------------------------------------------------------------  #------------------------------------------------------------------------
 #  #
 #   LocalConnection  #   LocalConnection
Line 175  sub ResetStatistics { Line 183  sub ResetStatistics {
 #   $Socket      - Socket open on client.  #   $Socket      - Socket open on client.
 #   $initcmd     - The full text of the init command.  #   $initcmd     - The full text of the init command.
 #  #
 # Implicit inputs:  
 #    $clientdns  - The DNS name of the remote client.  
 #    $thisserver - Our DNS name.  
 #  
 # Returns:  # Returns:
 #     IDEA session key on success.  #     IDEA session key on success.
 #     undef on failure.  #     undef on failure.
 #  #
 sub LocalConnection {  sub LocalConnection {
     my ($Socket, $initcmd) = @_;      my ($Socket, $initcmd) = @_;
     Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");      Debug("Attempting local connection: $initcmd client: $clientip");
     if($clientdns ne $thisserver) {      if($clientip ne "127.0.0.1") {
  &logthis('<font color="red"> LocalConnection rejecting non local: '   &logthis('<font color="red"> LocalConnection rejecting non local: '
  ."$clientdns ne $thisserver </font>");   ."$clientip ne 127.0.0.1 </font>");
  close $Socket;   close $Socket;
  return undef;   return undef;
     }       }  else {
     else {  
  chomp($initcmd); # Get rid of \n in filename.   chomp($initcmd); # Get rid of \n in filename.
  my ($init, $type, $name) = split(/:/, $initcmd);   my ($init, $type, $name) = split(/:/, $initcmd);
  Debug(" Init command: $init $type $name ");   Debug(" Init command: $init $type $name ");
Line 323  sub InsecureConnection { Line 326  sub InsecureConnection {
     $answer    =~s/\W//g;      $answer    =~s/\W//g;
     if($challenge eq $answer) {      if($challenge eq $answer) {
  return 1;   return 1;
     }       } else {
     else {  
  logthis("<font color='blue'>WARNING client did not respond to challenge</font>");   logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
  &status("No challenge reqply");   &status("No challenge reqply");
  return 0;   return 0;
Line 332  sub InsecureConnection { Line 334  sub InsecureConnection {
           
   
 }  }
   
 #  #
   #   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 371  sub isClient { Line 408  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 {
   
       &Debug("Reading manager table");
     #   Clean out the old table first..      #   Clean out the old table first..
   
    foreach my $key (keys %managers) {     foreach my $key (keys %managers) {
Line 390  sub ReadManagerTable { Line 427  sub ReadManagerTable {
       if ($host =~ "^#") {                  # Comment line.        if ($host =~ "^#") {                  # Comment line.
          next;           next;
       }        }
       if (!defined $hostip{$host}) { # This is a non cluster member        if (!defined &Apache::lonnet::get_host_ip($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
Line 408  sub ReadManagerTable { Line 445  sub ReadManagerTable {
          }           }
       } else {        } else {
          logthis('<font color="green"> existing host'." $host</font>\n");           logthis('<font color="green"> existing host'." $host</font>\n");
          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber           $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
       }        }
    }     }
 }  }
Line 440  sub CopyFile { Line 477  sub CopyFile {
   
     my ($oldfile, $newfile) = @_;      my ($oldfile, $newfile) = @_;
   
     #  The file must exist:      if (! copy($oldfile,$newfile)) {
           return 0;
     if(-e $oldfile) {  
   
  # Read the old file.  
   
  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 497  sub AdjustHostContents { Line 506  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) {
           my $ip = gethostbyname($name);   my $ip = gethostbyname($name);
           my $ipnew = inet_ntoa($ip);   my $ipnew = inet_ntoa($ip);
          $ip = $ipnew;   $ip = $ipnew;
  #  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:
 #       - The file is created with <name>.tmp  #       - The file is created int a temp directory called <name>.tmp
 #       - The <name>.tmp file is then mv'd to <name>  #       - lcinstall file is called to install the file.
 #   This lugubrious procedure is done to ensure that we are never without  #         since the web app has no direct write access to the table directory
 #   a valid, even if dated, version of the file regardless of who crashes  
 #   and when the crash occurs.  
 #  #
 #  Parameters:  #  Parameters:
 #       Name of the file  #       Name of the file
Line 536  sub AdjustHostContents { Line 543  sub AdjustHostContents {
 #  Return:  #  Return:
 #      nonzero - success.  #      nonzero - success.
 #      0       - failure and $! has an errno.  #      0       - failure and $! has an errno.
   # Assumptions:
   #    File installtion is a relatively infrequent
 #  #
 sub InstallFile {  sub InstallFile {
   
     my ($Filename, $Contents) = @_;      my ($Filename, $Contents) = @_;
     my $TempFile = $Filename.".tmp";  #     my $TempFile = $Filename.".tmp";
       my $exedir = $perlvar{'lonDaemons'};
       my $tmpdir = $exedir.'/tmp/';
       my $TempFile = $tmpdir."TempTableFile.tmp";
   
     #  Open the file for write:      #  Open the file for write:
   
Line 554  sub InstallFile { Line 566  sub InstallFile {
     print $fh ($Contents);       print $fh ($Contents); 
     $fh->close; # In case we ever have a filesystem w. locking      $fh->close; # In case we ever have a filesystem w. locking
   
     chmod(0660, $TempFile);      chmod(0664, $TempFile); # Everyone can write it.
   
     # Now we can move install the file in position.      # Use lcinstall file to put the file in the table directory...
       
     move($TempFile, $Filename);      &Debug("Opening pipe to $exedir/lcinstallfile $TempFile $Filename");
       my $pf = IO::File->new("| $exedir/lcinstallfile   $TempFile $Filename > $exedir/logs/lcinstallfile.log");
       close $pf;
       my $err = $?;
       &Debug("Status is $err");
       if ($err != 0) {
    my $msg = $err;
    if ($err < @installerrors) {
       $msg = $installerrors[$err];
    }
    &logthis("Install failed for table file $Filename : $msg");
    return 0;
       }
   
       # Remove the temp file:
   
       unlink($TempFile);
   
     return 1;      return 1;
 }  }
Line 566  sub InstallFile { Line 594  sub InstallFile {
   
 #  #
 #   ConfigFileFromSelector: converts a configuration file selector  #   ConfigFileFromSelector: converts a configuration file selector
 #                 (one of host or domain at this point) into a   #                 into a configuration file pathname.
 #                 configuration file pathname.  #                 It's probably no longer necessary to preserve
   #                 special handling of hosts or domain as those
   #                 files have been superceded by dns_hosts, dns_domain.
   #                 The default action is just to prepend the directory
   #                 and append .tab
   #
 #  #
 #  Parameters:  #  Parameters:
 #      selector  - Configuration file selector.  #      selector  - Configuration file selector.
Line 584  sub ConfigFileFromSelector { Line 617  sub ConfigFileFromSelector {
     } elsif ($selector eq "domain") {      } elsif ($selector eq "domain") {
  $tablefile = $tabledir."domain.tab";   $tablefile = $tabledir."domain.tab";
     } else {      } else {
  return undef;   $tablefile =  $tabledir.$selector.'.tab';
     }      }
     return $tablefile;      return $tablefile;
   
Line 607  sub ConfigFileFromSelector { Line 640  sub ConfigFileFromSelector {
 sub PushFile {  sub PushFile {
     my $request = shift;          my $request = shift;    
     my ($command, $filename, $contents) = split(":", $request, 3);      my ($command, $filename, $contents) = split(":", $request, 3);
       &Debug("PushFile");
           
     #  At this point in time, pushes for only the following tables are      #  At this point in time, pushes for only the following tables are
     #  supported:      #  supported:
Line 623  sub PushFile { Line 657  sub PushFile {
     if(! (defined $tablefile)) {      if(! (defined $tablefile)) {
  return "refused";   return "refused";
     }      }
     #  
     # >copy< the old table to the backup table  
     #        don't rename in case system crashes/reboots etc. in the time  
     #        window between a rename and write.  
     #  
     my $backupfile = $tablefile;  
     $backupfile    =~ s/\.tab$/.old/;  
     if(!CopyFile($tablefile, $backupfile)) {  
  &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");  
  return "error:$!";  
     }  
     &logthis('<font color="green"> Pushfile: backed up '  
     .$tablefile." to $backupfile</font>");  
       
     #  If the file being pushed is the host file, we adjust the entry for ourself so that the      #  If the file being pushed is the host file, we adjust the entry for ourself so that the
     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible      #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a       #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
Line 649  sub PushFile { Line 670  sub PushFile {
   
     #  Install the new file:      #  Install the new file:
   
       &logthis("Installing new $tablefile contents:\n$contents");
     if(!InstallFile($tablefile, $contents)) {      if(!InstallFile($tablefile, $contents)) {
  &logthis('<font color="red"> Pushfile: unable to install '   &logthis('<font color="red"> Pushfile: unable to install '
  .$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 830  sub AdjustOurHost { Line 851  sub AdjustOurHost {
     #   Use the config line to get my hostname.      #   Use the config line to get my hostname.
     #   Use gethostbyname to translate that into an IP address.      #   Use gethostbyname to translate that into an IP address.
     #      #
     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);      my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
     my $BinaryIp = gethostbyname($name);  
     my $ip       = inet_ntoa($ip);  
     #      #
     #  Reassemble the config line from the elements in the list.      #  Reassemble the config line from the elements in the list.
     #  Note that if the loncnew items were not present before, they will      #  Note that if the loncnew items were not present before, they will
     #  be now even if they would be empty      #  be now even if they would be empty
     #      #
     my $newConfigLine = $id;      my $newConfigLine = $id;
     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {      foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) {
  $newConfigLine .= ":".$item;   $newConfigLine .= ":".$item;
     }      }
     #  Replace the line:      #  Replace the line:
Line 885  sub EditFile { Line 904  sub EditFile {
   
     #  Split the command into it's pieces:  edit:filetype:script      #  Split the command into it's pieces:  edit:filetype:script
   
     my ($request, $filetype, $script) = split(/:/, $request,3); # : in script      my ($cmd, $filetype, $script) = split(/:/, $request,3); # : in script
   
     #  Check the pre-coditions for success:      #  Check the pre-coditions for success:
   
     if($request != "edit") { # Something is amiss afoot alack.      if($cmd != "edit") { # Something is amiss afoot alack.
  return "error:edit request detected, but request != 'edit'\n";   return "error:edit request detected, but request != 'edit'\n";
     }      }
     if( ($filetype ne "hosts")  &&      if( ($filetype ne "hosts")  &&
Line 934  sub EditFile { Line 953  sub EditFile {
     return "ok\n";      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.
 #  #
 # Manipulation of hash based databases (factoring out common code  # Parameters:
 # for later use as we refactor.  #    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.
 #  #
 #  Ties a domain level resource file to a hash.  sub read_profile {
 #  If requested a history entry is created in the associated hist file.      my ($udom, $uname, $namespace, $what) = @_;
       
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_READER());
       if ($hashref) {
           my @queries=split(/\&/,$what);
           if ($namespace eq 'roles') {
               @queries = map { &unescape($_); } @queries; 
           }
           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:  #  Parameters:
 #     domain    - Name of the domain in which the resource file lives.  #      $cmd    - the actual keyword that invoked us.
 #     namespace - Name of the hash within that domain.  #      $tail   - the tail of the request that invoked us.
 #     how       - How to tie the hash (e.g. GDBM_WRCREAT()).  #      $replyfd- File descriptor connected to the client
 #     loghead   - Optional parameter, if present a log entry is created  #  Implicit Inputs:
 #                 in the associated history file and this is the first part  #      $currenthostid - Global variable that carries the name of the host we are
 #                  of that entry.  #                       known as.
 #     logtail   - Goes along with loghead,  The actual logentry is of the  #  Returns:
 #                 form $loghead:<timestamp>:logtail.  #      1       - Ok to continue processing.
 # Returns:  #      0       - Program should exit.
 #    Reference to a hash bound to the db file or alternatively undef  #  Side effects:
 #    if the tie failed.  #      Reply information is sent to the client.
 #  sub ping_handler {
 sub tie_domain_hash {      my ($cmd, $tail, $client) = @_;
     my ($domain,$namespace,$how,$loghead,$logtail) = @_;      Debug("$cmd $tail $client .. $currenthostid:");
          
     # Filter out any whitespace in the domain name:      Reply( $client,\$currenthostid,"$cmd:$tail");
          
     $domain =~ s/\W//g;      return 1;
       }
     # We have enough to go on to tie the hash:  &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
       
     my $user_top_dir   = $perlvar{'lonUsersDir'};  #++
     my $domain_dir     = $user_top_dir."/$domain";  #
     my $resource_file  = $domain_dir."/$namespace.db";  # Handles pong requests.  Pong replies with our current host id, and
     my %hash;  #                         the results of a ping sent to us via our lonc.
     if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {  #
  if (defined($loghead)) { # Need to log the operation.  # Parameters:
     my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");  #      $cmd    - the actual keyword that invoked us.
     if($logFh) {  #      $tail   - the tail of the request that invoked us.
  my $timestamp = time;  #      $replyfd- File descriptor connected to the client
  print $logFh "$loghead:$timestamp:$logtail\n";  #  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 $reply=&Apache::lonnet::reply("ping",$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 host 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, "$cmd:$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.
   #      $clientname    - Global variable that carries the name of the host we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   sub load_handler {
       my ($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( $replyfd, \$loadpercent, "$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.
   #      $clientname    - Global variable that carries the name of the host we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit inputs:
   #     whatever the userload() function requires.
   #  Implicit outputs:
   #     the reply is written to the client.
   #
   sub user_load_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
       my $userloadpercent=&Apache::lonnet::userload();
       &Reply($replyfd, \$userloadpercent, "$cmd:$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, $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) = @_;
       &Debug("In push file handler");
       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)) {
    &Debug("Valid manager: $client");
   
    # 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, $userinput);
   
       } else {
    &logthis("push_file_handler $client is not valid");
    &Failure( $client, "refused\n", $userinput);
       } 
       return 1;
   }
   &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
   
   # The du_handler routine should be considered obsolete and is retained
   # for communication with legacy servers.  Please see the du2_handler.
   #
   #   du  - list the disk usage of a directory recursively. 
   #    
   #   note: stolen code from the ls file handler
   #   under construction by Rick Banghart 
   #    .
   # Parameters:
   #    $cmd        - The command that dispatched us (du).
   #    $ududir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub du_handler {
       my ($cmd, $ududir, $client) = @_;
       ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
       my $userinput = "$cmd:$ududir";
   
       if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
    &Failure($client,"refused\n","$cmd:$ududir");
    return 1;
       }
       #  Since $ududir could have some nasties in it,
       #  we will require that ududir is a valid
       #  directory.  Just in case someone tries to
       #  slip us a  line like .;(cd /home/httpd rm -rf*)
       #  etc.
       #
       if (-d $ududir) {
    my $total_size=0;
    my $code=sub { 
       if ($_=~/\.\d+\./) { return;} 
       if ($_=~/\.meta$/) { return;}
       if (-d $_)         { return;}
       $total_size+=(stat($_))[7];
    };
    chdir($ududir);
    find($code,$ududir);
    $total_size=int($total_size/1024);
    &Reply($client,\$total_size,"$cmd:$ududir");
       } else {
    &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 
       }
       return 1;
   }
   &register_handler("du", \&du_handler, 0, 1, 0);
   
   # Please also see the du_handler, which is obsoleted by du2. 
   # du2_handler differs from du_handler in that required path to directory
   # provided by &propath() is prepended in the handler instead of on the 
   # client side.
   #
   #   du2  - list the disk usage of a directory recursively.
   #
   # Parameters:
   #    $cmd        - The command that dispatched us (du).
   #    $tail       - The tail of the request that invoked us.
   #                  $tail is a : separated list of the following:
   #                   - $ududir - directory path to list (before prepending)
   #                   - $getpropath = 1 if &propath() should prepend
   #                   - $uname - username to use for &propath or user dir
   #                   - $udom - domain to use for &propath or user dir
   #                   All are escaped.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to $client.
   #
   
   sub du2_handler {
       my ($cmd, $tail, $client) = @_;
       my ($ududir,$getpropath,$uname,$udom) = map { &unescape($_) } (split(/:/, $tail));
       my $userinput = "$cmd:$tail";
       if (($ududir=~/\.\./) || (($ududir!~m|^/home/httpd/|) && (!$getpropath))) {
           &Failure($client,"refused\n","$cmd:$tail");
           return 1;
       }
       if ($getpropath) {
           if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
               $ududir = &propath($udom,$uname).'/'.$ududir;
           } else {
               &Failure($client,"refused\n","$cmd:$tail");
               return 1;
           }
       }
       #  Since $ududir could have some nasties in it,
       #  we will require that ududir is a valid
       #  directory.  Just in case someone tries to
       #  slip us a  line like .;(cd /home/httpd rm -rf*)
       #  etc.
       #
       if (-d $ududir) {
           my $total_size=0;
           my $code=sub {
               if ($_=~/\.\d+\./) { return;}
               if ($_=~/\.meta$/) { return;}
               if (-d $_)         { return;}
               $total_size+=(stat($_))[7];
           };
           chdir($ududir);
           find($code,$ududir);
           $total_size=int($total_size/1024);
           &Reply($client,\$total_size,"$cmd:$ududir");
       } else {
           &Failure($client, "bad_directory:$ududir\n","$cmd:$tail");
       }
       return 1;
   }
   &register_handler("du2", \&du2_handler, 0, 1, 0);
   
   #
   # The ls_handler routine should be considered obsolete and is retained
   # for communication with legacy servers.  Please see the ls3_handler.
   #
   #   ls  - list the contents of a directory.  For each file in the
   #    selected directory the filename followed by the full output of
   #    the stat function is returned.  The returned info for each
   #    file are separated by ':'.  The stat fields are separated by &'s.
   # Parameters:
   #    $cmd        - The command that dispatched us (ls).
   #    $ulsdir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub ls_handler {
       # obsoleted by ls2_handler
       my ($cmd, $ulsdir, $client) = @_;
   
       my $userinput = "$cmd:$ulsdir";
   
       my $obs;
       my $rights;
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
    if(-d $ulsdir) {
       if (opendir(LSDIR,$ulsdir)) {
    while ($ulsfn=readdir(LSDIR)) {
       undef($obs);
       undef($rights); 
       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
       #We do some obsolete checking here
       if(-e $ulsdir.'/'.$ulsfn.".meta") { 
    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
    my @obsolete=<FILE>;
    foreach my $obsolete (@obsolete) {
       if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
       if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
    }
       }
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
       if($obs eq '1') { $ulsout.="&1"; }
       else { $ulsout.="&0"; }
       if($rights eq '1') { $ulsout.="&1:"; }
       else { $ulsout.="&0:"; }
    }
    closedir(LSDIR);
       }
    } else {
       my @ulsstats=stat($ulsdir);
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
    }
       } else {
    $ulsout='no_such_dir';
       }
       if ($ulsout eq '') { $ulsout='empty'; }
       &Reply($client, \$ulsout, $userinput); # This supports debug logging.
       
       return 1;
   
   }
   &register_handler("ls", \&ls_handler, 0, 1, 0);
   
   # The ls2_handler routine should be considered obsolete and is retained
   # for communication with legacy servers.  Please see the ls3_handler.
   # Please also see the ls_handler, which was itself obsoleted by ls2.
   # ls2_handler differs from ls_handler in that it escapes its return 
   # values before concatenating them together with ':'s.
   #
   #   ls2  - list the contents of a directory.  For each file in the
   #    selected directory the filename followed by the full output of
   #    the stat function is returned.  The returned info for each
   #    file are separated by ':'.  The stat fields are separated by &'s.
   # Parameters:
   #    $cmd        - The command that dispatched us (ls).
   #    $ulsdir     - The directory path to list... I'm not sure what this
   #                  is relative as things like ls:. return e.g.
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to  $client.
   #
   sub ls2_handler {
       my ($cmd, $ulsdir, $client) = @_;
   
       my $userinput = "$cmd:$ulsdir";
   
       my $obs;
       my $rights;
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
           if(-d $ulsdir) {
               if (opendir(LSDIR,$ulsdir)) {
                   while ($ulsfn=readdir(LSDIR)) {
                       undef($obs);
       undef($rights); 
                       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                       #We do some obsolete checking here
                       if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                           open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                           my @obsolete=<FILE>;
                           foreach my $obsolete (@obsolete) {
                               if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
                               if($obsolete =~ m|(<copyright>)(default)|) {
                                   $rights = 1;
                               }
                           }
                       }
                       my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                       if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       $ulsout.= &escape($tmp).':';
                   }
                   closedir(LSDIR);
               }
           } else {
               my @ulsstats=stat($ulsdir);
               $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
           }
       } else {
           $ulsout='no_such_dir';
      }
      if ($ulsout eq '') { $ulsout='empty'; }
      &Reply($client, \$ulsout, $userinput); # This supports debug logging.
      return 1;
   }
   &register_handler("ls2", \&ls2_handler, 0, 1, 0);
   #
   #   ls3  - list the contents of a directory.  For each file in the
   #    selected directory the filename followed by the full output of
   #    the stat function is returned.  The returned info for each
   #    file are separated by ':'.  The stat fields are separated by &'s.
   # Parameters:
   #    $cmd        - The command that dispatched us (ls).
   #    $tail       - The tail of the request that invoked us.
   #                  $tail is a : separated list of the following:
   #                   - $ulsdir - directory path to list (before prepending)
   #                   - $getpropath = 1 if &propath() should prepend
   #                   - $getuserdir = 1 if path to user dir in lonUsers should
   #                                     prepend
   #                   - $alternate_root - path to prepend
   #                   - $uname - username to use for &propath or user dir
   #                   - $udom - domain to use for &propath or user dir
   #            All of these except $getpropath and &getuserdir are escaped.    
   #                  no_such_dir.
   #    $client     - Socket open on the client.
   # Returns:
   #     1 - indicating that the daemon should not disconnect.
   # Side Effects:
   #   The reply is written to $client.
   #
   
   sub ls3_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($ulsdir,$getpropath,$getuserdir,$alternate_root,$uname,$udom) =
           split(/:/,$tail);
       if (defined($ulsdir)) {
           $ulsdir = &unescape($ulsdir);
       }
       if (defined($alternate_root)) {
           $alternate_root = &unescape($alternate_root);
       }
       if (defined($uname)) {
           $uname = &unescape($uname);
       }
       if (defined($udom)) {
           $udom = &unescape($udom);
       }
   
       my $dir_root = $perlvar{'lonDocRoot'};
       if ($getpropath) {
           if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
               $dir_root = &propath($udom,$uname);
               $dir_root =~ s/\/$//;
           } else {
               &Failure($client,"refused\n","$cmd:$tail");
               return 1;
           }
       } elsif ($getuserdir) {
           if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
               my $subdir=$uname.'__';
               $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
               $dir_root = $Apache::lonnet::perlvar{'lonUsersDir'}
                          ."/$udom/$subdir/$uname";
           } else {
               &Failure($client,"refused\n","$cmd:$tail");
               return 1;
           }
       } elsif ($alternate_root ne '') {
           $dir_root = $alternate_root;
       }
       if (($dir_root ne '') && ($dir_root ne '/')) {
           if ($ulsdir =~ /^\//) {
               $ulsdir = $dir_root.$ulsdir;
           } else {
               $ulsdir = $dir_root.'/'.$ulsdir;
           }
       }
       my $obs;
       my $rights;
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
           if(-d $ulsdir) {
               if (opendir(LSDIR,$ulsdir)) {
                   while ($ulsfn=readdir(LSDIR)) {
                       undef($obs);
                       undef($rights);
                       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                       #We do some obsolete checking here
                       if(-e $ulsdir.'/'.$ulsfn.".meta") {
                           open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                           my @obsolete=<FILE>;
                           foreach my $obsolete (@obsolete) {
                               if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
                               if($obsolete =~ m|(<copyright>)(default)|) {
                                   $rights = 1;
                               }
                           }
                       }
                       my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                       if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                       $ulsout.= &escape($tmp).':';
                   }
                   closedir(LSDIR);
               }
           } else {
               my @ulsstats=stat($ulsdir);
               $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
           }
       } else {
           $ulsout='no_such_dir';
       }
       if ($ulsout eq '') { $ulsout='empty'; }
       &Reply($client, \$ulsout, $userinput); # This supports debug logging.
       return 1;
   }
   &register_handler("ls3", \&ls3_handler, 0, 1, 0);
   
   sub server_timezone_handler {
       my ($cmd,$tail,$client) = @_;
       my $userinput = "$cmd:$tail";
       my $timezone;
       my $clockfile = '/etc/sysconfig/clock'; # Fedora/CentOS/SuSE
       my $tzfile = '/etc/timezone'; # Debian/Ubuntu
       if (-e $clockfile) {
           if (open(my $fh,"<$clockfile")) {
               while (<$fh>) {
                   next if (/^[\#\s]/);
                   if (/^(?:TIME)?ZONE\s*=\s*['"]?\s*([\w\/]+)/) {
                       $timezone = $1;
                       last;
                   }
               }
               close($fh);
           }
       } elsif (-e $tzfile) {
           if (open(my $fh,"<$tzfile")) {
               $timezone = <$fh>;
               close($fh);
               chomp($timezone);
               if ($timezone =~ m{^Etc/(\w+)$}) {
                   $timezone = $1;
               }
           }
       }
       &Reply($client,\$timezone,$userinput); # This supports debug logging.
       return 1;
   }
   &register_handler("servertimezone", \&server_timezone_handler, 0, 1, 0);
   
   sub server_loncaparev_handler {
       my ($cmd,$tail,$client) = @_;
       my $userinput = "$cmd:$tail";
       &Reply($client,\$perlvar{'lonVersion'},$userinput);
       return 1;
   }
   &register_handler("serverloncaparev", \&server_loncaparev_handler, 0, 1, 0);
   
   sub server_homeID_handler {
       my ($cmd,$tail,$client) = @_;
       my $userinput = "$cmd:$tail";
       &Reply($client,\$perlvar{'lonHostID'},$userinput);
       return 1;
   }
   &register_handler("serverhomeID", \&server_homeID_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, $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.
       #  checkdefauth - Pass to validate_user() to try authentication
       #                 with default auth type(s) if no user account.
       #  clientcancheckhost - Passed by clients with functionality in lonauth.pm
       #                       to check if session can be hosted.
       
       my ($udom, $uname, $upass, $checkdefauth, $clientcancheckhost)=split(/:/,$tail);
       &Debug(" Authenticate domain = $udom, user = $uname, password = $upass,  checkdefauth = $checkdefauth");
       chomp($upass);
       $upass=&unescape($upass);
   
       my $pwdcorrect = &validate_user($udom,$uname,$upass,$checkdefauth);
       if($pwdcorrect) {
           my $canhost = 1;
           unless ($clientcancheckhost) {
               my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
               my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
               my @intdoms;
               my $internet_names = &Apache::lonnet::get_internet_names($clientname);
               if (ref($internet_names) eq 'ARRAY') {
                   @intdoms = @{$internet_names};
               }
               unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
                   my ($remote,$hosted);
                   my $remotesession = &get_usersession_config($udom,'remotesession');
                   if (ref($remotesession) eq 'HASH') {
                       $remote = $remotesession->{'remote'}
                   }
                   my $hostedsession = &get_usersession_config($clienthomedom,'hostedsession');
                   if (ref($hostedsession) eq 'HASH') {
                       $hosted = $hostedsession->{'hosted'};
                   }
                   my $loncaparev = $clientversion;
                   if ($loncaparev eq '') {
                       $loncaparev = $Apache::lonnet::loncaparevs{$clientname};
                   }
                   $canhost = &Apache::lonnet::can_host_session($udom,$clientname,
                                                                $loncaparev,
                                                                $remote,$hosted);
               }
           }
           if ($canhost) {               
               &Reply( $client, "authorized\n", $userinput);
           } else {
               &Reply( $client, "not_allowed_to_host\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.
       #  context - Context in which this was called 
       #            (preferences or reset_by_email).
       #  lonhost - HostID of server where request originated 
      
       my ($udom,$uname,$upass,$npass,$context,$lonhost)=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 unless context was 'reset_by_email':
       
       my ($validated,$failure);
       if ($context eq 'reset_by_email') {
           if ($lonhost eq '') {
               $failure = 'invalid_client';
           } else {
               $validated = 1;
           }
       } else {
           $validated = &validate_user($udom, $uname, $upass);
       }
       if($validated) {
    my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
   
    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
    if ($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")) {
    my $msg="Result of password change for $uname: pwchange_success";
                   if ($lonhost) {
                       $msg .= " - request originated from: $lonhost";
                   }
                   &logthis($msg);
    &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' && $context ne 'reset_by_email') {
       my $result = &change_unix_password($uname, $npass);
       &logthis("Result of password change for $uname: ".
        $result);
       &Reply($client, \$result, $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 {
    if ($failure eq '') {
       $failure = 'non_authorized';
    }
    &Failure( $client, "$failure\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, $userinput);
       }
    }
    umask($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);
    } else {
       &Failure($client, \$result);
    }
       } else {
    my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
    #
    #  If the current auth mode is internal, and the old auth mode was
    #  unix, or krb*,  and the user is an author for this domain,
    #  re-run manage_permissions for that role in order to be able
    #  to take ownership of the construction space back to www:www
    #
   
   
    if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
       (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
       if(&is_author($udom, $uname)) {
    &Debug(" Need to manage author permissions...");
    &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
       }
    }
    &Reply($client, \$result, $userinput);
       }
          
   
    } else {       
       &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
    }
       }
       return 1;
   }
   &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.
   #   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. 
   # 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 $fname) {
               # Delete preview file, if exists
               unlink("$fname.tmp");
               # Get usage stats
       my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
    $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
       my $now=time;
       my $since=$now-$atime;
               # If the file has not been used within lonExpire seconds,
               # unsubscribe from it and delete local copy
       if ($since>$perlvar{'lonExpire'}) {
    my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
    &devalidate_meta_cache($fname);
    unlink("$fname");
    unlink("$fname.meta");
       } else {
               # Yes, this is in active use. Get a fresh copy. Since it might be in
               # very active use and huge (like a movie), copy it to "in.transfer" filename first.
    my $transname="$fname.in.transfer";
    my $remoteurl=&Apache::lonnet::reply("sub:$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);
       }
                       # we successfully transfered, copy file over to real name
       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']});
       $url = &Apache::lonnet::declutter($url);
       $url =~ s-\.meta$--;
       my $id = &escape('meta:'.$url);
       $memcache->delete($id);
   }
   
   #
   #   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);
   
   #
   #  Checks if the specified user has an active session on the server
   #  return ok if so, not_found if not
   #
   # Parameters:
   #   cmd      - The request keyword that dispatched to tus.
   #   tail     - The tail of the request (colon separated parameters).
   #   client   - Filehandle open on the client.
   # Return:
   #    1.
   sub user_has_session_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($udom, $uname) = map { &unescape($_) } (split(/:/, $tail));
       
       &logthis("Looking for $udom $uname");
       opendir(DIR,$perlvar{'lonIDsDir'});
       my $filename;
       while ($filename=readdir(DIR)) {
    last if ($filename=~/^\Q$uname\E_\d+_\Q$udom\E_/);
       }
       if ($filename) {
    &Reply($client, "ok\n", "$cmd:$tail");
       } else {
    &Failure($client, "not_found\n", "$cmd:$tail");
       }
       return 1;
   
   }
   &register_handler("userhassession", \&user_has_session_handler, 0,1,0);
   
   #
   #  Authenticate access to a user file by checking that the token the user's 
   #  passed also exists in their session file
   #
   # Parameters:
   #   cmd      - The request keyword that dispatched to tus.
   #   tail     - The tail of the request (colon separated parameters).
   #   client   - Filehandle open on the client.
   # Return:
   #    1.
   sub token_auth_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($fname, $session) = split(/:/, $tail);
       
       chomp($session);
       my $reply="non_auth";
       my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
       if (open(ENVIN,"$file")) {
    flock(ENVIN,LOCK_SH);
    tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640);
    if (exists($disk_env{"userfile.$fname"})) {
       $reply="ok";
    } else {
       foreach my $envname (keys(%disk_env)) {
    if ($envname=~ m|^userfile\.\Q$fname\E|) {
       $reply="ok";
       last;
    }
       }
    }
    untie(%disk_env);
    close(ENVIN);
    &Reply($client, \$reply, "$cmd:$tail");
       } else {
    &Failure($client, "invalid_token\n", "$cmd:$tail");
       }
       return 1;
   
   }
   &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
   
   #
   #   Unsubscribe from a resource.
   #
   # 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 latest version of a resource (it looks for the highest
   #   past version and then returns that +1)
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #                 (Should consist of an absolute path to a file)
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub current_version_handler {
       my ($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;
                       }
                   }
     }      }
     $logFh->close;      if (&untie_user_hash($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);
  }   }
  return \%hash; # Return the tied hash.  
     } else {      } else {
  return undef; # Tie failed.          &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.
 #  #
 #   Ties a user's resource file to a hash.    
 #   If necessary, an appropriate history  
 #   log file entry is made as well.  
 #   This sub factors out common code from the subs that manipulate  
 #   the various gdbm files that keep keyword value pairs.  
 # Parameters:  # Parameters:
 #   domain       - Name of the domain the user is in.  #   $cmd             - Command request keyword (get).
 #   user         - Name of the 'current user'.  #   $tail            - Tail of the command.  This is a colon separated list
 #   namespace    - Namespace representing the file to tie.  #                      consisting of the domain and username that uniquely
 #   how          - What the tie is done to (e.g. GDBM_WRCREAT().  #                      identifies the profile,
 #   loghead      - Optional first part of log entry if there may be a  #                      The 'namespace' which selects the gdbm file to 
 #                  history file.  #                      do the lookup in, 
 #   what         - Optional tail of log entry if there may be a history  #                      & separated list of keys to lookup.  Note that
 #                  file.  #                      the values are returned as an & separated list too.
   #   $client          - File descriptor open on the client.
 # Returns:  # Returns:
 #   hash to which the database is tied.  It's up to the caller to untie.  #   1       - Continue processing.
 #   undef if the has could not be tied.  #   0       - Exit.
 #  #
 sub tie_user_hash {  sub get_profile_entry {
     my ($domain,$user,$namespace,$how,$loghead,$what) = @_;      my ($cmd, $tail, $client) = @_;
   
     $namespace=~s/\//\_/g; # / -> _      my $userinput= "$cmd:$tail";
     $namespace=~s/\W//g; # whitespace eliminated.  
     my $proname     = propath($domain, $user);  
         
     #  Tie the database.      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, $userinput);
       } else {
    &Failure($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 ($udom,$uname,$namespace,$what) = split(/:/,$tail);
       chomp($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, $userinput);
    } else {
       &Failure($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, $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,$range,$extra)=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());
       my $clientcheckrole;
       if ($hashref) {
           my $qresult='';
    my $count=0;
           if ($extra ne '') {
               $extra = &Apache::lonnet::thaw_unescape($extra);
               $clientcheckrole = $extra->{'clientcheckrole'};
           }
           my @ids = &Apache::lonnet::current_machine_ids();
           my (%homecourses,$major,$minor,$now);
           if (($namespace eq 'roles') && (!$clientcheckrole)) {
               my $loncaparev = $clientversion;
               if ($loncaparev eq '') {
                   $loncaparev = $Apache::lonnet::loncaparevs{$clientname};
               }
               if ($loncaparev =~ /^\'?(\d+)\.(\d+)\.[\w.\-]+\'?/) {
                   $major = $1;
                   $minor = $2;
               }
               $now = time;
           }
    while (my ($key,$value) = each(%$hashref)) {
               if ($namespace eq 'roles') {
                   if ($key =~ m{^/($LONCAPA::match_domain)/($LONCAPA::match_courseid)(/?[^_]*)_(cc|co|in|ta|ep|ad|st|cr)$}) {
                       my $cdom = $1;
                       my $cnum = $2;
                       unless ($clientcheckrole) {
                           next unless (&releasereqd_check($cnum,$cdom,$key,$value,$major,$minor,
                                                           $now,\%homecourses,\@ids));
                       }
                   }
               }
       if ($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)) {
               if (($namespace eq 'roles') && (!$clientcheckrole)) {
                   if (keys(%homecourses) > 0) {
                       $qresult .= &check_homecourses(\%homecourses,$udom,$regexp,$count,
                                                      $range,$start,$end,$major,$minor);
                   }
               }
       chop($qresult);
       &Reply($client, \$qresult, $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting dump\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting dump\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
   
   #  Store a set of key=value pairs associated with a versioned name.
   #
   #  Parameters:
   #    $cmd                - Request command keyword.
   #    $tail               - Tail of the request.  This is a colon
   #                          separated list containing:
   #                          domain/user - User and authentication domain.
   #                          namespace   - Name of the database being modified
   #                          rid         - Resource keyword to modify.
   #                          what        - new value associated with rid.
   #
   #    $client             - Socket open on the client.
   #
   #
   #  Returns:
   #      1 (keep on processing).
   #  Side-Effects:
   #    Writes to the client
   sub store_handler {
       my ($cmd, $tail, $client) = @_;
    
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
       if ($namespace ne 'roles') {
   
    chomp($what);
    my @pairs=split(/\&/,$what);
    my $hashref  = &tie_user_hash($udom, $uname, $namespace,
          &GDBM_WRCREAT(), "S",
          "$rid:$what");
    if ($hashref) {
       my $now = time;
       my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
       my $key;
       $hashref->{"version:$rid"}++;
       my $version=$hashref->{"version:$rid"};
       my $allkeys=''; 
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $allkeys.=$key.':';
    $hashref->{"$version:$rid:$key"}=$value;
       }
       $hashref->{"$version:$rid:timestamp"}=$now;
       $allkeys.='timestamp';
       $hashref->{"$version:keys:$rid"}=$allkeys;
       if (&untie_user_hash($hashref)) {
    &Reply($client, "ok\n", $userinput);
       } else {
    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    "while attempting store\n", $userinput);
       }
    } else {
       &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting store\n", $userinput);
    }
       } else {
    &Failure($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 ($str)=@_;
     my %hash;      my %hash;
     if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",      foreach my $pair (split(/\&/,$str)) {
    $how, 0640)) {   my ($key,$value)=split(/=/,$pair);
  # If this is a namespace for which a history is kept,   $hash{$key}=$value;
  # make the history log entry:          }
  if (($namespace =~/^nohist\_/) && (defined($loghead))) {      return (%hash);
     my $args = scalar @_;  }
     Debug(" Opening history: $namespace $args");  sub hash_to_str {
     my $hfh = IO::File->new(">>$proname/$namespace.hist");       my ($hash_ref)=@_;
     if($hfh) {      my $str;
  my $now = time;      foreach my $key (keys(%$hash_ref)) {
  print $hfh "$loghead:$now:$what\n";   $str.=$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:$tail"; # Only used for logging purposes.
       my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
       $namespace=~s/\//\_/g;
       $namespace = &LONCAPA::clean_username($namespace);
   
       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, $userinput);
    } else {
       &Failure($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, $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 ($id,$reply)=split(/:/,$tail); 
       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);
               $courseinfo =~ s/=/:/g;
               if (defined($hashref->{$key})) {
                   my $value = &Apache::lonnet::thaw_unescape($hashref->{$key});
                   if (ref($value) eq 'HASH') {
                       my @items = ('description','inst_code','owner','type');
                       my @new_items = split(/:/,$courseinfo,-1);
                       my %storehash; 
                       for (my $i=0; $i<@new_items; $i++) {
                           $storehash{$items[$i]} = &unescape($new_items[$i]);
                       }
                       $hashref->{$key} = 
                           &Apache::lonnet::freeze_escape(\%storehash);
                       my $unesc_key = &unescape($key);
                       $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
                       next;
                   }
               }
               my @current_items = split(/:/,$hashref->{$key},-1);
               shift(@current_items); # remove description
               pop(@current_items);   # remove last access
               my $numcurrent = scalar(@current_items);
               if ($numcurrent > 3) {
                   $numcurrent = 3;
               }
               my @new_items = split(/:/,$courseinfo,-1);
               my $numnew = scalar(@new_items);
               if ($numcurrent > 0) {
                   if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 
                       for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
                           $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
                       }
                   }
               }
               $hashref->{$key}=$courseinfo.':'.$now;
    }
    if (&untie_domain_hash($hashref)) {
       &Reply( $client, "ok\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)
        ." untie(GDBM) Failed ".
        "while attempting courseidput\n", $userinput);
    }
       } else {
    &Failure($client, "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting courseidput\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
   
   sub put_course_id_hash_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($udom,$mode,$what) = split(/:/, $tail,3);
       chomp($what);
       my $now=time;
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
           foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               my $unesc_key = &unescape($key);
               if ($mode ne 'timeonly') {
                   if (!defined($hashref->{&escape('lasttime:'.$unesc_key)})) {
                       my $curritems = &Apache::lonnet::thaw_unescape($key); 
                       if (ref($curritems) ne 'HASH') {
                           my @current_items = split(/:/,$hashref->{$key},-1);
                           my $lasttime = pop(@current_items);
                           $hashref->{&escape('lasttime:'.$unesc_key)} = $lasttime;
                       } else {
                           $hashref->{&escape('lasttime:'.$unesc_key)} = '';
                       }
                   } 
                   $hashref->{$key} = $value;
               }
               if ($mode ne 'notime') {
                   $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
               }
           }
           if (&untie_domain_hash($hashref)) {
               &Reply($client, "ok\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                        "while attempting courseidputhash\n", $userinput);
           }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                     "while attempting courseidputhash\n", $userinput);
       }
       return 1;
   }
   &register_handler("courseidputhash", \&put_course_id_hash_handler, 0, 1, 0);
   
   #  Retrieves the value of a course id resource keyword pattern
   #  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.
   #                 type     - optional parameter for selection 
   #                 regexp_ok - if 1 or -1 allow the supplied institutional code
   #                            filter to behave as a regular expression:
   #                      1 will not exclude the course if the instcode matches the RE 
   #                            -1 will exclude the course if the instcode matches the RE
   #                 rtn_as_hash - whether to return the information available for
   #                            each matched item as a frozen hash of all 
   #                            key, value pairs in the item's hash, or as a 
   #                            colon-separated list of (in order) description,
   #                            institutional code, and course owner.
   #                 selfenrollonly - filter by courses allowing self-enrollment  
   #                                  now or in the future (selfenrollonly = 1).
   #                 catfilter - filter by course category, assigned to a course 
   #                             using manually defined categories (i.e., not
   #                             self-cataloging based on on institutional code).   
   #                 showhidden - include course in results even if course  
   #                              was set to be excluded from course catalog (DC only).
   #                 caller -  if set to 'coursecatalog', courses set to be hidden
   #                           from course catalog will be excluded from results (unless
   #                           overridden by "showhidden".
   #                 cloner - escaped username:domain of course cloner (if picking course to
   #                          clone).
   #                 cc_clone_list - escaped comma separated list of courses for which 
   #                                 course cloner has active CC role (and so can clone
   #                                 automatically).
   #                 cloneonly - filter by courses for which cloner has rights to clone.
   #                 createdbefore - include courses for which creation date preceeded this date.
   #                 createdafter - include courses for which creation date followed this date.
   #                 creationcontext - include courses created in specified context 
   #
   #                 domcloner - flag to indicate if user can create CCs in course's domain.
   #                             If so, ability to clone course is automatic. 
   #
   #     $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,
           $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
           $caller,$cloner,$cc_clone_list,$cloneonly,$createdbefore,$createdafter,
           $creationcontext,$domcloner) =split(/:/,$tail);
       my $now = time;
       my ($cloneruname,$clonerudom,%cc_clone);
       if (defined($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 {
           $typefilter='.';
       }
       if (defined($regexp_ok)) {
           $regexp_ok=&unescape($regexp_ok);
       }
       if (defined($catfilter)) {
           $catfilter=&unescape($catfilter);
       }
       if (defined($cloner)) {
           $cloner = &unescape($cloner);
           ($cloneruname,$clonerudom) = ($cloner =~ /^($LONCAPA::match_username):($LONCAPA::match_domain)$/); 
       }
       if (defined($cc_clone_list)) {
           $cc_clone_list = &unescape($cc_clone_list);
           my @cc_cloners = split('&',$cc_clone_list);
           foreach my $cid (@cc_cloners) {
               my ($clonedom,$clonenum) = split(':',$cid);
               next if ($clonedom ne $udom); 
               $cc_clone{$clonedom.'_'.$clonenum} = 1;
           } 
       }
       if ($createdbefore ne '') {
           $createdbefore = &unescape($createdbefore);
       } else {
          $createdbefore = 0;
       }
       if ($createdafter ne '') {
           $createdafter = &unescape($createdafter);
       } else {
           $createdafter = 0;
       }
       if ($creationcontext ne '') {
           $creationcontext = &unescape($creationcontext);
       } else {
           $creationcontext = '.';
       }
       my $unpack = 1;
       if ($description eq '.' && $instcodefilter eq '.' && $coursefilter eq '.' && 
           $typefilter eq '.') {
           $unpack = 0;
       }
       if (!defined($since)) { $since=0; }
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
    while (my ($key,$value) = each(%$hashref)) {
               my ($unesc_key,$lasttime_key,$lasttime,$is_hash,%val,
                   %unesc_val,$selfenroll_end,$selfenroll_types,$created,
                   $context);
               $unesc_key = &unescape($key);
               if ($unesc_key =~ /^lasttime:/) {
                   next;
               } else {
                   $lasttime_key = &escape('lasttime:'.$unesc_key);
               }
               if ($hashref->{$lasttime_key} ne '') {
                   $lasttime = $hashref->{$lasttime_key};
                   next if ($lasttime<$since);
               }
               my ($canclone,$valchange);
               my $items = &Apache::lonnet::thaw_unescape($value);
               if (ref($items) eq 'HASH') {
                   if ($hashref->{$lasttime_key} eq '') {
                       next if ($since > 1);
                   }
                   $is_hash =  1;
                   if ($domcloner) {
                       $canclone = 1;
                   } elsif (defined($clonerudom)) {
                       if ($items->{'cloners'}) {
                           my @cloneable = split(',',$items->{'cloners'});
                           if (@cloneable) {
                               if (grep(/^\*$/,@cloneable))  {
                                   $canclone = 1;
                               } elsif (grep(/^\*:\Q$clonerudom\E$/,@cloneable)) {
                                   $canclone = 1;
                               } elsif (grep(/^\Q$cloneruname\E:\Q$clonerudom\E$/,@cloneable)) {
                                   $canclone = 1;
                               }
                           }
                           unless ($canclone) {
                               if ($cloneruname ne '' && $clonerudom ne '') {
                                   if ($cc_clone{$unesc_key}) {
                                       $canclone = 1;
                                       $items->{'cloners'} .= ','.$cloneruname.':'.
                                                              $clonerudom;
                                       $valchange = 1;
                                   }
                               }
                           }
                       } elsif (defined($cloneruname)) {
                           if ($cc_clone{$unesc_key}) {
                               $canclone = 1;
                               $items->{'cloners'} = $cloneruname.':'.$clonerudom;
                               $valchange = 1;
                           }
                           unless ($canclone) {
                               if ($items->{'owner'} =~ /:/) {
                                   if ($items->{'owner'} eq $cloner) {
                                       $canclone = 1;
                                   }
                               } elsif ($cloner eq $items->{'owner'}.':'.$udom) {
                                   $canclone = 1;
                               }
                               if ($canclone) {
                                   $items->{'cloners'} = $cloneruname.':'.$clonerudom;
                                   $valchange = 1;
                               }
                           }
                       }
                   }
                   if ($unpack || !$rtn_as_hash) {
                       $unesc_val{'descr'} = $items->{'description'};
                       $unesc_val{'inst_code'} = $items->{'inst_code'};
                       $unesc_val{'owner'} = $items->{'owner'};
                       $unesc_val{'type'} = $items->{'type'};
                       $unesc_val{'cloners'} = $items->{'cloners'};
                       $unesc_val{'created'} = $items->{'created'};
                       $unesc_val{'context'} = $items->{'context'};
                   }
                   $selfenroll_types = $items->{'selfenroll_types'};
                   $selfenroll_end = $items->{'selfenroll_end_date'};
                   $created = $items->{'created'};
                   $context = $items->{'context'};
                   if ($selfenrollonly) {
                       next if (!$selfenroll_types);
                       if (($selfenroll_end > 0) && ($selfenroll_end <= $now)) {
                           next;
                       }
                   }
                   if ($creationcontext ne '.') {
                       next if (($context ne '') && ($context ne $creationcontext));  
                   }
                   if ($createdbefore > 0) {
                       next if (($created eq '') || ($created > $createdbefore));   
                   }
                   if ($createdafter > 0) {
                       next if (($created eq '') || ($created <= $createdafter)); 
                   }
                   if ($catfilter ne '') {
                       next if ($items->{'categories'} eq '');
                       my @categories = split('&',$items->{'categories'}); 
                       next if (@categories == 0);
                       my @subcats = split('&',$catfilter);
                       my $matchcat = 0;
                       foreach my $cat (@categories) {
                           if (grep(/^\Q$cat\E$/,@subcats)) {
                               $matchcat = 1;
                               last;
                           }
                       }
                       next if (!$matchcat);
                   }
                   if ($caller eq 'coursecatalog') {
                       if ($items->{'hidefromcat'} eq 'yes') {
                           next if !$showhidden;
                       }
                   }
               } else {
                   next if ($catfilter ne '');
                   next if ($selfenrollonly);
                   next if ($createdbefore || $createdafter);
                   next if ($creationcontext ne '.');
                   if ((defined($clonerudom)) && (defined($cloneruname)))  {
                       if ($cc_clone{$unesc_key}) {
                           $canclone = 1;
                           $val{'cloners'} = &escape($cloneruname.':'.$clonerudom);
                       }
                   }
                   $is_hash =  0;
                   my @courseitems = split(/:/,$value);
                   $lasttime = pop(@courseitems);
                   if ($hashref->{$lasttime_key} eq '') {
                       next if ($lasttime<$since);
                   }
           ($val{'descr'},$val{'inst_code'},$val{'owner'},$val{'type'}) = @courseitems;
               }
               if ($cloneonly) {
                  next unless ($canclone);
               }
               my $match = 1;
       if ($description ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'descr'} = &unescape($val{'descr'});
                   }
                   if (eval{$unesc_val{'descr'} !~ /\Q$description\E/i}) {
                       $match = 0;
                   }
               }
               if ($instcodefilter ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'inst_code'} = &unescape($val{'inst_code'});
                   }
                   if ($regexp_ok == 1) {
                       if (eval{$unesc_val{'inst_code'} !~ /$instcodefilter/}) {
                           $match = 0;
                       }
                   } elsif ($regexp_ok == -1) {
                       if (eval{$unesc_val{'inst_code'} =~ /$instcodefilter/}) {
                           $match = 0;
                       }
                   } else {
                       if (eval{$unesc_val{'inst_code'} !~ /\Q$instcodefilter\E/i}) {
                           $match = 0;
                       }
                   }
     }      }
     $hfh->close;              if ($ownerfilter ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'owner'} = &unescape($val{'owner'});
                   }
                   if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
                       if ($unesc_val{'owner'} =~ /:/) {
                           if (eval{$unesc_val{'owner'} !~ 
                                /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i}) {
                               $match = 0;
                           } 
                       } else {
                           if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
                               $match = 0;
                           }
                       }
                   } elsif ($ownerunamefilter ne '') {
                       if ($unesc_val{'owner'} =~ /:/) {
                           if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E:[^:]+$/i}) {
                                $match = 0;
                           }
                       } else {
                           if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
                               $match = 0;
                           }
                       }
                   } elsif ($ownerdomfilter ne '') {
                       if ($unesc_val{'owner'} =~ /:/) {
                           if (eval{$unesc_val{'owner'} !~ /^[^:]+:\Q$ownerdomfilter\E/}) {
                                $match = 0;
                           }
                       } else {
                           if ($ownerdomfilter ne $udom) {
                               $match = 0;
                           }
                       }
                   }
               }
               if ($coursefilter ne '.') {
                   if (eval{$unesc_key !~ /^$udom(_)\Q$coursefilter\E$/}) {
                       $match = 0;
                   }
               }
               if ($typefilter ne '.') {
                   if (!$is_hash) {
                       $unesc_val{'type'} = &unescape($val{'type'});
                   }
                   if ($unesc_val{'type'} eq '') {
                       if ($typefilter ne 'Course') {
                           $match = 0;
                       }
                   } else {
                       if (eval{$unesc_val{'type'} !~ /^\Q$typefilter\E$/}) {
                           $match = 0;
                       }
                   }
               }
               if ($match == 1) {
                   if ($rtn_as_hash) {
                       if ($is_hash) {
                           if ($valchange) {
                               my $newvalue = &Apache::lonnet::freeze_escape($items);
                               $qresult.=$key.'='.$newvalue.'&';
                           } else {
                               $qresult.=$key.'='.$value.'&';
                           }
                       } else {
                           my %rtnhash = ( 'description' => &unescape($val{'descr'}),
                                           'inst_code' => &unescape($val{'inst_code'}),
                                           'owner'     => &unescape($val{'owner'}),
                                           'type'      => &unescape($val{'type'}),
                                           'cloners'   => &unescape($val{'cloners'}),
                                         );
                           my $items = &Apache::lonnet::freeze_escape(\%rtnhash);
                           $qresult.=$key.'='.$items.'&';
                       }
                   } else {
                       if ($is_hash) {
                           $qresult .= $key.'='.&escape($unesc_val{'descr'}).':'.
                                       &escape($unesc_val{'inst_code'}).':'.
                                       &escape($unesc_val{'owner'}).'&';
                       } else {
                           $qresult .= $key.'='.$val{'descr'}.':'.$val{'inst_code'}.
                                       ':'.$val{'owner'}.'&';
                       }
                   }
               }
    }
    if (&untie_domain_hash($hashref)) {
       chop($qresult);
       &Reply($client, \$qresult, $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);
  }   }
  return \%hash;  
     } else {      } else {
  return undef;   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting courseiddump\n", $userinput);
       }
       return 1;
   }
   &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
   
   sub course_lastaccess_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($cdom,$cnum) = split(':',$tail); 
       my (%lastaccess,$qresult);
       my $hashref = &tie_domain_hash($cdom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
           while (my ($key,$value) = each(%$hashref)) {
               my ($unesc_key,$lasttime);
               $unesc_key = &unescape($key);
               if ($cnum) {
                   next unless ($unesc_key =~ /\Q$cdom\E_\Q$cnum\E$/);
               }
               if ($unesc_key =~ /^lasttime:($LONCAPA::match_domain\_$LONCAPA::match_courseid)/) {
                   $lastaccess{$1} = $value;
               } else {
                   my $items = &Apache::lonnet::thaw_unescape($value);
                   if (ref($items) eq 'HASH') {
                       unless ($lastaccess{$unesc_key}) {
                           $lastaccess{$unesc_key} = '';
                       }
                   } else {
                       my @courseitems = split(':',$value);
                       $lastaccess{$unesc_key} = pop(@courseitems);
                   }
               }
           }
           foreach my $cid (sort(keys(%lastaccess))) {
               $qresult.=&escape($cid).'='.$lastaccess{$cid}.'&'; 
           }
           if (&untie_domain_hash($hashref)) {
               if ($qresult) {
                   chop($qresult);
               }
               &Reply($client, \$qresult, $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                       "while attempting lastacourseaccess\n", $userinput);
           }
       } else {
           &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   "while attempting lastcourseaccess\n", $userinput);
       }
       return 1;
   }
   &register_handler("courselastaccess",\&course_lastaccess_handler, 0, 1, 0);
   
   #
   # Puts an unencrypted entry in a namespace db file at the domain level 
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #  Side effects:
   #     reply is written to $client.
   #
   sub put_domain_handler {
       my ($cmd,$tail,$client) = @_;
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$namespace,$what) =split(/:/,$tail,3);
       chomp($what);
       my @pairs=split(/\&/,$what);
       my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
                                      "P", $what);
       if ($hashref) {
           foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               $hashref->{$key}=$value;
           }
           if (&untie_domain_hash($hashref)) {
               &Reply($client, "ok\n", $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                        "while attempting putdom\n", $userinput);
           }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                     "while attempting putdom\n", $userinput);
       }
   
       return 1;
   }
   &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
   
   # Unencrypted get from the namespace database file at the domain level.
   # This function retrieves a keyed item from a specific named database in the
   # domain directory.
   #
   # Parameters:
   #   $cmd             - Command request keyword (get).
   #   $tail            - Tail of the command.  This is a colon separated list
   #                      consisting of the domain and the 'namespace' 
   #                      which selects the gdbm file to do the lookup in,
   #                      & separated list of keys to lookup.  Note that
   #                      the values are returned as an & separated list too.
   #   $client          - File descriptor open on the client.
   # Returns:
   #   1       - Continue processing.
   #   0       - Exit.
   #  Side effects:
   #     reply is written to $client.
   #
   
   sub get_domain_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = "$client:$tail";
   
       my ($udom,$namespace,$what)=split(/:/,$tail,3);
       chomp($what);
       my @queries=split(/\&/,$what);
       my $qresult='';
       my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
       if ($hashref) {
           for (my $i=0;$i<=$#queries;$i++) {
               $qresult.="$hashref->{$queries[$i]}&";
           }
           if (&untie_domain_hash($hashref)) {
               $qresult=~s/\&$//;
               &Reply($client, \$qresult, $userinput);
           } else {
               &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                         "while attempting getdom\n",$userinput);
           }
       } else {
           &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                    "while attempting getdom\n",$userinput);
       }
   
       return 1;
   }
   &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
   
   #
   #  Puts an id to a domains id database. 
   #
   #  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, $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, $userinput);
           } else {
               &Failure($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 $match = 1;
               my ($end,$start) = split(/:/,&unescape($value));
               my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
               unless (@roles < 1) {
                   unless (grep/^\Q$trole\E$/,@roles) {
                       $match = 0;
                       next;
                   }
               }
               unless ($startfilter eq '.' || !defined($startfilter)) {
                   if ((defined($start)) && ($start >= $startfilter)) {
                       $match = 0;
                       next;
                   }
               }
               unless ($endfilter eq '.' || !defined($endfilter)) {
                   if ((defined($end)) && (($end > 0) && ($end <= $endfilter))) {
                       $match = 0;
                       next;
                   }
               }
               if ($match == 1) {
                   $qresult.=$key.'='.$value.'&';
               }
           }
           if (&untie_domain_hash($hashref)) {
               chop($qresult);
               &Reply($client, \$qresult, $userinput);
           } else {
               &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                       "while attempting 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 ($record,$context) = split(/:/,$what);
       if ($context ne '') {
           chomp($context);
           $context = &unescape($context);
       }
       my ($id,$store);
       $tmpsnum++;
       if ($context eq 'resetpw') {
           $id = &md5_hex(&md5_hex(time.{}.rand().$$));
       } else {
           $id = $$.'_'.$clientip.'_'.$tmpsnum;
       }
       $id=~s/\W/\_/g;
       $record=~s/\n//g;
       my $execdir=$perlvar{'lonDaemons'};
       if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
    print $store $record;
    close $store;
    &Reply($client, \$id, $userinput);
       } else {
    &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
     "while attempting tmpput\n", $userinput);
       }
       return 1;
     
   }
   &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
   
   #   Processes the tmpget command.  This command returns the contents
   #  of a temporary resource file(?) created via tmpput.
   #
   # 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, $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, $userinput);
   
       return 1;
   }
   &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
   
   #
   #   Validate an institutional code used for a LON-CAPA course.          
   #
   # 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:
   #                        $dom      - The domain for which the check of 
   #                                    institutional course code will occur.
   #
   #                        $instcode - The institutional code for the course
   #                                    being requested, or validated for rights
   #                                    to request.
   #
   #                        $owner    - The course requestor (who will be the
   #                                    course owner, in the form username:domain
   #
   #   $client       - Socket open on the client.
   # Returns:
   #    1           - Indicating processing should continue.
   #
   sub validate_instcode_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($dom,$instcode,$owner) = split(/:/, $tail);
       $instcode = &unescape($instcode);
       $owner = &unescape($owner);
       my ($outcome,$description) = 
           &localenroll::validate_instcode($dom,$instcode,$owner);
       my $result = &escape($outcome).'&'.&escape($description);
       &Reply($client, \$result, $userinput);
   
       return 1;
   }
   &register_handler("autovalidateinstcode", \&validate_instcode_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, $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, $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, $userinput);
   
   
       return 1;
   }
   &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
   
   #
   #   Validate course owner's access to enrollment data for specific class section. 
   #   
   #
   # Formal Parameters:
   #    $cmd     - The command request that got us dispatched.
   #    $tail    - The tail of the command.   In this case this is a colon separated
   #               set of words that will be split into:
   #               $inst_class  - Institutional code for the specific class section   
   #               $courseowner - The escaped username:domain of the course owner 
   #               $cdom        - The domain of the course from the institution's
   #                              point of view.
   #    $client  - The socket open on the client.
   # Returns:
   #    1 - continue processing.
   #
   
   sub validate_class_access_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($inst_class,$ownerlist,$cdom) = split(/:/, $tail);
       my $owners = &unescape($ownerlist);
       my $outcome;
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $outcome=&localenroll::check_section($inst_class,$owners,$cdom);
       };
       &Reply($client,\$outcome, $userinput);
   
       return 1;
 }  }
   &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
   
   #
   #   Create a password for a new LON-CAPA user added by auto-enrollment.
   #   Only used for case where authentication method for new user is localauth
   #
   # Formal Parameters:
   #    $cmd     - The command request that got us dispatched.
   #    $tail    - The tail of the command.   In this case this is a colon separated
   #               set of words that will be split into:
   #               $authparam - An authentication parameter (localauth parameter).
   #               $cdom      - The domain of the course from the institution's
   #                            point of view.
   #    $client  - The socket open on the client.
   # Returns:
   #    1 - continue processing.
   #
   sub create_auto_enroll_password_handler {
       my ($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);
   
   sub crsreq_checks_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my $dom = $tail;
       my $result;
       my @reqtypes = ('official','unofficial','community');
       eval {
           local($SIG{__DIE__})='DEFAULT';
           my %validations;
           my $response = &localenroll::crsreq_checks($dom,\@reqtypes,
                                                      \%validations);
           if ($response eq 'ok') { 
               foreach my $key (keys(%validations)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($validations{$key}).'&';
               }
               $result =~ s/\&$//;
           } else {
               $result = 'error';
           }
       };
       if (!$@) {
           &Reply($client, \$result, $userinput);
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
       return 1;
   }
   &register_handler("autocrsreqchecks", \&crsreq_checks_handler, 0, 1, 0);
   
   sub validate_crsreq_handler {
       my ($cmd, $tail, $client) = @_;
       my $userinput = "$cmd:$tail";
       my ($dom,$owner,$crstype,$inststatuslist,$instcode,$instseclist) = split(/:/, $tail);
       $instcode = &unescape($instcode);
       $owner = &unescape($owner);
       $crstype = &unescape($crstype);
       $inststatuslist = &unescape($inststatuslist);
       $instcode = &unescape($instcode);
       $instseclist = &unescape($instseclist);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::validate_crsreq($dom,$owner,$crstype,
                                                    $inststatuslist,$instcode,
                                                    $instseclist);
       };
       if (!$@) {
           &Reply($client, \$outcome, $userinput);
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
       return 1;
   }
   &register_handler("autocrsreqvalidation", \&validate_crsreq_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 = &Apache::lonnet::hash2str(%codes);
    my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
    my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
    my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
    &Reply($client,
          $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
          .$cat_order_str."\n",
          $userinput);
       } else {
    # this else branch added by RF since if not ok, lonc will
    # hang waiting on reply until timeout.
    #
    &Reply($client, "format_error\n", $userinput);
       }
       
       return 1;
   }
   &register_handler("autoinstcodeformat",
     \&get_institutional_code_format_handler,0,1,0);
   
   sub get_institutional_defaults_handler {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
   
       my $dom = $tail;
       my %defaults_hash;
       my @code_order;
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
                                                      \@code_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               while (my ($key,$value) = each(%defaults_hash)) {
                   $result.=&escape($key).'='.&escape($value).'&';
               }
               $result .= 'code_order='.&escape(join('&',@code_order));
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("autoinstcodedefaults",
                     \&get_institutional_defaults_handler,0,1,0);
   
   sub get_possible_instcodes_handler {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
   
       my $reply;
       my $cdom = $tail;
       my (@codetitles,%cat_titles,%cat_order,@code_order);
       my $formatreply = &localenroll::possible_instcodes($cdom,
                                                          \@codetitles,
                                                          \%cat_titles,
                                                          \%cat_order,
                                                          \@code_order);
       if ($formatreply eq 'ok') {
           my $result = join('&',map {&escape($_);} (@codetitles)).':';
           $result .= join('&',map {&escape($_);} (@code_order)).':';
           foreach my $key (keys(%cat_titles)) {
               $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($cat_titles{$key}).'&';
           }
           $result =~ s/\&$//;
           $result .= ':';
           foreach my $key (keys(%cat_order)) {
               $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($cat_order{$key}).'&';
           }
           $result =~ s/\&$//;
           &Reply($client,\$result,$userinput);
       } else {
           &Reply($client, "format_error\n", $userinput);
       }
       return 1;
   }
   &register_handler("autopossibleinstcodes",
                     \&get_possible_instcodes_handler,0,1,0);
   
   sub get_institutional_user_rules {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $dom = &unescape($tail);
       my (%rules_hash,@rules_order);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::username_rules($dom,\%rules_hash,\@rules_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result;
               foreach my $key (keys(%rules_hash)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
               }
               $result =~ s/\&$//;
               $result .= ':';
               if (@rules_order > 0) {
                   foreach my $item (@rules_order) {
                       $result .= &escape($item).'&';
                   }
               }
               $result =~ s/\&$//;
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instuserrules",\&get_institutional_user_rules,0,1,0);
   
   sub get_institutional_id_rules {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $dom = &unescape($tail);
       my (%rules_hash,@rules_order);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::id_rules($dom,\%rules_hash,\@rules_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result;
               foreach my $key (keys(%rules_hash)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
               }
               $result =~ s/\&$//;
               $result .= ':';
               if (@rules_order > 0) {
                   foreach my $item (@rules_order) {
                       $result .= &escape($item).'&';
                   }
               }
               $result =~ s/\&$//;
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instidrules",\&get_institutional_id_rules,0,1,0);
   
   sub get_institutional_selfcreate_rules {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my $dom = &unescape($tail);
       my (%rules_hash,@rules_order);
       my $outcome;
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::selfcreate_rules($dom,\%rules_hash,\@rules_order);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result;
               foreach my $key (keys(%rules_hash)) {
                   $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
               }
               $result =~ s/\&$//;
               $result .= ':';
               if (@rules_order > 0) {
                   foreach my $item (@rules_order) {
                       $result .= &escape($item).'&';
                   }
               }
               $result =~ s/\&$//;
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instemailrules",\&get_institutional_selfcreate_rules,0,1,0);
   
   
   sub institutional_username_check {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my %rulecheck;
       my $outcome;
       my ($udom,$uname,@rules) = split(/:/,$tail);
       $udom = &unescape($udom);
       $uname = &unescape($uname);
       @rules = map {&unescape($_);} (@rules);
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::username_check($udom,$uname,\@rules,\%rulecheck);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               foreach my $key (keys(%rulecheck)) {
                   $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
               }
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instrulecheck",\&institutional_username_check,0,1,0);
   
   sub institutional_id_check {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my %rulecheck;
       my $outcome;
       my ($udom,$id,@rules) = split(/:/,$tail);
       $udom = &unescape($udom);
       $id = &unescape($id);
       @rules = map {&unescape($_);} (@rules);
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::id_check($udom,$id,\@rules,\%rulecheck);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               foreach my $key (keys(%rulecheck)) {
                   $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
               }
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instidrulecheck",\&institutional_id_check,0,1,0);
   
   sub institutional_selfcreate_check {
       my ($cmd, $tail, $client)   = @_;
       my $userinput               = "$cmd:$tail";
       my %rulecheck;
       my $outcome;
       my ($udom,$email,@rules) = split(/:/,$tail);
       $udom = &unescape($udom);
       $email = &unescape($email);
       @rules = map {&unescape($_);} (@rules);
       eval {
           local($SIG{__DIE__})='DEFAULT';
           $outcome = &localenroll::selfcreate_check($udom,$email,\@rules,\%rulecheck);
       };
       if (!$@) {
           if ($outcome eq 'ok') {
               my $result='';
               foreach my $key (keys(%rulecheck)) {
                   $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
               }
               &Reply($client,\$result,$userinput);
           } else {
               &Reply($client,"error\n", $userinput);
           }
       } else {
           &Failure($client,"unknown_cmd\n",$userinput);
       }
   }
   &register_handler("instselfcreatecheck",\&institutional_selfcreate_check,0,1,0);
   
   # Get domain specific conditions for import of student photographs to a course
   #
   # 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);
   
   sub inst_usertypes_handler {
       my ($cmd, $domain, $client) = @_;
       my $res;
       my $userinput = $cmd.":".$domain; # For logging purposes.
       my (%typeshash,@order,$result);
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
       };
       if ($result eq 'ok') {
           if (keys(%typeshash) > 0) {
               foreach my $key (keys(%typeshash)) {
                   $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
               }
           }
           $res=~s/\&$//;
           $res .= ':';
           if (@order > 0) {
               foreach my $item (@order) {
                   $res .= &escape($item).'&';
               }
           }
           $res=~s/\&$//;
       }
       &Reply($client, \$res, $userinput);
       return 1;
   }
   &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
   
   # 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:  #   Getting, decoding and dispatching requests:
 #  #
   
 #  #
 #   Get a Request:  #   Get a Request:
 #   Gets a Request message from the client.  The transaction  #   Gets a Request message from the client.  The transaction
 #   is defined as a 'line' of text.  We remove the new line  #   is defined as a 'line' of text.  We remove the new line
 #   from the text line.    #   from the text line.  
 #     #
 sub get_request {  sub get_request {
     my $input = <$client>;      my $input = <$client>;
     chomp($input);      chomp($input);
   
     Debug("Request = $input\n");      &Debug("get_request: Request = $input\n");
   
     &status('Processing '.$clientname.':'.$input);      &status('Processing '.$clientname.':'.$input);
   
     return $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 $client "unknown_cmd\n";
   # -------------------------------------------------------------------- complete
       Debug("process_request - returning 1");
       return 1;
   }
 #  #
 #   Decipher encoded traffic  #   Decipher encoded traffic
 #  Parameters:  #  Parameters:
Line 1065  sub get_request { Line 5830  sub get_request {
 sub decipher {  sub decipher {
     my ($input)  = @_;      my ($input)  = @_;
     my $output = '';      my $output = '';
          
          
     if($cipher) {      if($cipher) {
  my($enc, $enclength, $encinput) = split(/:/, $input);   my($enc, $enclength, $encinput) = split(/:/, $input);
  for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {   for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
Line 1107  sub decipher { Line 5872  sub decipher {
 #        register a duplicate command handler.  #        register a duplicate command handler.
 #  #
 sub register_handler {  sub register_handler {
     my ($request_name,      my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok)   = @_;
  $procedure,  
  $must_encode,  
  $client_ok,  
  $manager_ok)   = @_;  
   
     #  Don't allow duplication#      #  Don't allow duplication#
         
Line 1134  sub register_handler { Line 5895  sub register_handler {
         
     $Dispatcher{$request_name} = \@entry;      $Dispatcher{$request_name} = \@entry;
         
      
 }  }
   
   
Line 1174  sub catchexception { Line 5934  sub catchexception {
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
     &status("Catching exception");      &status("Catching exception");
     &logthis("<font color='red'>CRITICAL: "      &logthis("<font color='red'>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "       ."ABNORMAL EXIT. Child $$ for server ".$perlvar{'lonHostID'}." died through "
      ."a crash with this error msg->[$error]</font>");       ."a crash with this error msg->[$error]</font>");
     &logthis('Famous last words: '.$status.' - '.$lastlog);      &logthis('Famous last words: '.$status.' - '.$lastlog);
     if ($client) { print $client "error: $error\n"; }      if ($client) { print $client "error: $error\n"; }
     $server->close();      $server->close();
     die($error);      die($error);
 }  }
   
 sub timeout {  sub timeout {
     &status("Handling Timeout");      &status("Handling Timeout");
     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
Line 1189  sub timeout { Line 5948  sub 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 1285  sub HUPSMAN {                      # sig Line 6045  sub HUPSMAN {                      # sig
 }  }
   
 #  #
 #    Kill off hashes that describe the host table prior to re-reading it.  
 #    Hashes affected are:  
 #       %hostid, %hostdom %hostip %hostdns.  
 #  
 sub KillHostHashes {  
     foreach my $key (keys %hostid) {  
  delete $hostid{$key};  
     }  
     foreach my $key (keys %hostdom) {  
  delete $hostdom{$key};  
     }  
     foreach my $key (keys %hostip) {  
  delete $hostip{$key};  
     }  
     foreach my $key (keys %hostdns) {  
  delete $hostdns{$key};  
     }  
 }  
 #  
 #   Read in the host table from file and distribute it into the various hashes:  
 #  
 #    - %hostid  -  Indexed by IP, the loncapa hostname.  
 #    - %hostdom -  Indexed by  loncapa hostname, the domain.  
 #    - %hostip  -  Indexed by hostid, the Ip address of the host.  
 sub ReadHostTable {  
   
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";  
     my $myloncapaname = $perlvar{'lonHostID'};  
     Debug("My loncapa name is : $myloncapaname");  
     while (my $configline=<CONFIG>) {  
  if (!($configline =~ /^\s*\#/)) {  
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);  
     chomp($ip); $ip=~s/\D+$//;  
     $hostid{$ip}=$id;         # LonCAPA name of host by IP.  
     $hostdom{$id}=$domain;    # LonCAPA domain name of host.   
     $hostip{$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);  
 }  
 #  
 #  Reload the Apache daemon's state.  #  Reload the Apache daemon's state.
 #  This is done by invoking /home/httpd/perl/apachereload  #  This is done by invoking /home/httpd/perl/apachereload
 #  a setuid perl script that can be root for us to do this job.  #  a setuid perl script that can be root for us to do this job.
Line 1362  sub UpdateHosts { Line 6075  sub UpdateHosts {
     #  either dropped or changed hosts.  Note that the re-read of the table      #  either dropped or changed hosts.  Note that the re-read of the table
     #  will take care of new and changed hosts as connections come into being.      #  will take care of new and changed hosts as connections come into being.
   
       &Apache::lonnet::reset_hosts_info();
   
     KillHostHashes;      foreach my $child (keys(%children)) {
     ReadHostTable;  
   
     foreach my $child (keys %children) {  
  my $childip = $children{$child};   my $childip = $children{$child};
  if(!$hostid{$childip}) {   if ($childip ne '127.0.0.1'
       && !defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
     logthis('<font color="blue"> UpdateHosts killing child '      logthis('<font color="blue"> UpdateHosts killing child '
     ." $child for ip $childip </font>");      ." $child for ip $childip </font>");
     kill('INT', $child);      kill('INT', $child);
Line 1389  sub checkchildren { Line 6101  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 1410  sub checkchildren { Line 6124  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 1417  sub checkchildren { Line 6132  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 1448  sub Debug { Line 6164  sub Debug {
 #     request - Original request from client.  #     request - Original request from client.
 #  #
 sub Reply {  sub Reply {
   
     my ($fd, $reply, $request) = @_;      my ($fd, $reply, $request) = @_;
       if (ref($reply)) {
    print $fd $$reply;
    print $fd "\n";
    if ($DEBUG) { Debug("Request was $request  Reply was $$reply"); }
       } else {
    print $fd $reply;
    if ($DEBUG) { Debug("Request was $request  Reply was $reply"); }
       }
       $Transactions++;
   }
   
     print $fd $reply;  
     Debug("Request was $request  Reply was $reply");  
   
   #
   #    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 1461  sub logstatus { Line 6206  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 $$."\t".$clientname."\t".$currenthostid."\t"  
  .$status."\t".$lastlog."\t $keymode\n";  
     $fh->close();  
     }  
     &status("Finished londstatus.txt");  
     {  
  my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");   my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
         print $fh $status."\n".$lastlog."\n".time."\n$keymode";          print $fh $status."\n".$lastlog."\n".time."\n$keymode";
         $fh->close();          $fh->close();
     }      }
       &status("Finished $$.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 1498  sub status { Line 6245  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  
   
 sub reconlonc {  
     my $peerfile=shift;  
     &logthis("Trying to reconnect for $peerfile");  
     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";  
     if (my $fh=IO::File->new("$loncfile")) {  
  my $loncpid=<$fh>;  
         chomp($loncpid);  
         if (kill 0 => $loncpid) {  
     &logthis("lonc at pid $loncpid responding, sending USR1");  
             kill USR1 => $loncpid;  
         } else {  
     &logthis(  
               "<font color='red'>CRITICAL: "  
              ."lonc at pid $loncpid not responding, giving up</font>");  
         }  
     } else {  
       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');  
     }  
 }  
   
 # -------------------------------------------------- Non-critical communication  
   
 sub subreply {  
     my ($cmd,$server)=@_;  
     my $peerfile="$perlvar{'lonSockDir'}/$server";  
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",  
                                       Type    => SOCK_STREAM,  
                                       Timeout => 10)  
        or return "con_lost";  
     print $sclient "$cmd\n";  
     my $answer=<$sclient>;  
     chomp($answer);  
     if (!$answer) { $answer="con_lost"; }  
     return $answer;  
 }  
   
 sub reply {  
   my ($cmd,$server)=@_;  
   my $answer;  
   if ($server ne $currenthostid) {   
     $answer=subreply($cmd,$server);  
     if ($answer eq 'con_lost') {  
  $answer=subreply("ping",$server);  
         if ($answer ne $server) {  
     &logthis("sub reply: answer != server answer is $answer, server is $server");  
            &reconlonc("$perlvar{'lonSockDir'}/$server");  
         }  
         $answer=subreply($cmd,$server);  
     }  
   } else {  
     $answer='self_reply';  
   }   
   return $answer;  
 }  
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
   
 sub sqlreply {  sub sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $answer=subsqlreply($cmd);      my $answer=&sub_sql_reply($cmd);
     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }      if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
     return $answer;      return $answer;
 }  }
   
 sub subsqlreply {  sub sub_sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $unixsock="mysqlsock";      my $unixsock="mysqlsock";
     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";      my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
Line 1588  sub subsqlreply { Line 6262  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 1651  $SIG{USR1} = \&checkchildren; Line 6313  $SIG{USR1} = \&checkchildren;
 $SIG{USR2} = \&UpdateHosts;  $SIG{USR2} = \&UpdateHosts;
   
 #  Read the host hashes:  #  Read the host hashes:
   &Apache::lonnet::load_hosts_tab();
   my %iphost = &Apache::lonnet::get_iphost(1);
   
 ReadHostTable;  my $dist=`$perlvar{'lonDaemons'}/distprobe`;
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated  #   Accept connections.  When a connection comes in, it is validated
Line 1700  sub make_new_child { Line 6364  sub make_new_child {
     if (defined($iaddr)) {      if (defined($iaddr)) {
  $clientip  = inet_ntoa($iaddr);   $clientip  = inet_ntoa($iaddr);
  Debug("Connected with $clientip");   Debug("Connected with $clientip");
  $clientdns = gethostbyaddr($iaddr, AF_INET);  
  Debug("Connected with $clientdns by name");  
     } else {      } else {
  &logthis("Unable to determine clientip");   &logthis("Unable to determine clientip");
  $clientip='Unavailable';   $clientip='Unavailable';
Line 1731  sub make_new_child { Line 6393  sub make_new_child {
 #        my $tmpsnum=0;            # Now global  #        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 'fedora5') || ($dist eq 'fedora4') ||  
    ($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
       &Authen::Krb5::init_ets();
    }
   
  &status('Accepted connection');   &status('Accepted connection');
 # =============================================================================  # =============================================================================
Line 1739  sub make_new_child { Line 6404  sub make_new_child {
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
  # see if we know client and 'check' for spoof IP by ineffective challenge   # see if we know client and 'check' for spoof IP by ineffective challenge
   
  ReadManagerTable; # May also be a manager!!   my $outsideip=$clientip;
    if ($clientip eq '127.0.0.1') {
  my $clientrec=($hostid{$clientip}     ne undef);      $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
  my $ismanager=($managers{$clientip}    ne undef);   }
  $clientname  = "[unknonwn]";   &ReadManagerTable();
    my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
    my $ismanager=($managers{$outsideip}    ne undef);
    $clientname  = "[unknown]";
  if($clientrec) { # Establish client type.   if($clientrec) { # Establish client type.
     $ConnectionType = "client";      $ConnectionType = "client";
     $clientname = $hostid{$clientip};      $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
     if($ismanager) {      if($ismanager) {
  $ConnectionType = "both";   $ConnectionType = "both";
     }      }
  } else {   } else {
     $ConnectionType = "manager";      $ConnectionType = "manager";
     $clientname = $managers{$clientip};      $clientname = $managers{$outsideip};
  }   }
  my $clientok;   my $clientok;
   
Line 1765  sub make_new_child { Line 6433  sub make_new_child {
     my $remotereq=<$client>;      my $remotereq=<$client>;
     chomp($remotereq);      chomp($remotereq);
     Debug("Got init: $remotereq");      Debug("Got init: $remotereq");
     my $inikeyword = split(/:/, $remotereq);  
     if ($remotereq =~ /^init/) {      if ($remotereq =~ /^init/) {
  &sethost("sethost:$perlvar{'lonHostID'}");   &sethost("sethost:$perlvar{'lonHostID'}");
  #   #
  #  If the remote is attempting a local init... give that a try:   #  If the remote is attempting a local init... give that a try:
  #   #
  my ($i, $inittype) = split(/:/, $remotereq);   (my $i, my $inittype, $clientversion) = split(/:/, $remotereq);
   
  # If the connection type is ssl, but I didn't get my   # If the connection type is ssl, but I didn't get my
  # certificate files yet, then I'll drop  back to    # certificate files yet, then I'll drop  back to 
Line 1786  sub make_new_child { Line 6454  sub make_new_child {
  $inittype = ""; # This forces insecure attempt.   $inittype = ""; # This forces insecure attempt.
  &logthis("<font color=\"blue\"> Certificates not "   &logthis("<font color=\"blue\"> Certificates not "
  ."installed -- trying insecure auth</font>");   ."installed -- trying insecure auth</font>");
     }      } else { # SSL certificates are in place so
     else { # SSL certificates are in place so  
     } # Leave the inittype alone.      } # Leave the inittype alone.
  }   }
   
  if($inittype eq "local") {   if($inittype eq "local") {
                       $clientversion = $perlvar{'lonVersion'};
     my $key = LocalConnection($client, $remotereq);      my $key = LocalConnection($client, $remotereq);
     if($key) {      if($key) {
  Debug("Got local key $key");   Debug("Got local key $key");
Line 1799  sub make_new_child { Line 6467  sub make_new_child {
  my $cipherkey = pack("H32", $key);   my $cipherkey = pack("H32", $key);
  $cipher       = new IDEA($cipherkey);   $cipher       = new IDEA($cipherkey);
  print $client "ok:local\n";   print $client "ok:local\n";
  &logthis('<font color="green"'   &logthis('<font color="green">'
  . "Successful local authentication </font>");   . "Successful local authentication </font>");
  $keymode = "local"   $keymode = "local"
     } else {      } else {
Line 1854  sub make_new_child { Line 6522  sub make_new_child {
     
  if ($clientok) {   if ($clientok) {
 # ---------------- New known client connecting, could mean machine online again  # ---------------- New known client connecting, could mean machine online again
           if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip 
     foreach my $id (keys(%hostip)) {   && $clientip ne '127.0.0.1') {
  if ($hostip{$id} ne $clientip ||   &Apache::lonnet::reconlonc($clientname);
     $hostip{$currenthostid} eq $clientip) {  
     # no need to try to do recon's to myself  
     next;  
  }  
  &reconlonc("$perlvar{'lonSockDir'}/$id");  
     }      }
     &logthis("<font color='green'>Established connection: $clientname</font>");      &logthis("<font color='green'>Established connection: $clientname</font>");
     &status('Will listen to '.$clientname);      &status('Will listen to '.$clientname);
 # ------------------------------------------------------------ Process requests  # ------------------------------------------------------------ Process requests
     while (my $userinput=<$client>) {      my $keep_going = 1;
                 chomp($userinput);      my $user_input;
  Debug("Request = $userinput\n");              my $clienthost = &Apache::lonnet::hostname($clientname);
                 &status('Processing '.$clientname.': '.$userinput);              my $clientserverhomeID = &Apache::lonnet::get_server_homeID($clienthost);
                 my $wasenc=0;              $clienthomedom = &Apache::lonnet::host_domain($clientserverhomeID);
                 alarm(120);      while(($user_input = get_request) && $keep_going) {
 # ------------------------------------------------------------ See if encrypted   alarm(120);
  if ($userinput =~ /^enc/) {   Debug("Main: Got $user_input\n");
     if ($cipher) {   $keep_going = &process_request($user_input);
  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", $userinput);  
  }  
 #------------------------------------------------------------------------- edit  
     } elsif ($userinput =~ /^edit/) {    # encoded and manager:  
  if(($wasenc ==1) && (isManager)) {  
     my $cert = GetCertificate($userinput);  
     if(ValidManager($cert)) {  
                my($command, $filetype, $script) = split(/:/, $userinput);  
                if (($filetype eq "hosts") || ($filetype eq "domain")) {  
                   if($script ne "") {  
       Reply($client, EditFile($userinput));  
                   } else {  
                      Reply($client,"refused\n",$userinput);  
                   }  
                } else {  
                   Reply($client,"refused\n",$userinput);  
                }  
             } else {  
                Reply($client,"refused\n",$userinput);  
             }  
          } 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:'.$uname.','.  
      &Authen::Krb4::get_err_txt($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,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);  
  my $udir=propath($udom,$uname).'/userfiles';  
  unless (-e $udir) { mkdir($udir,0770); }  
  if (-e $udir) {  
                             $ufile=~s/^[\.\~]+//;  
                             my $path = $udir;  
                             if ($ufile =~m|(.+)/([^/]+)$|) {  
                                 my @parts=split('/',$1);  
                                 foreach my $part (@parts) {  
                                     $path .= '/'.$part;  
                                     if ((-e $path)!=1) {  
                                         mkdir($path,0770);  
                                     }  
                                 }  
                             }  
     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", $userinput);  
     }  
 # --------------------------------------------------------- remove a user file   
  } elsif ($userinput =~ /^removeuserfile/) { # Client clear or enc.  
     if(isClient) {  
  my ($cmd,$fname)=split(/:/,$userinput);  
  my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);  
  &logthis("$udom - $uname - $ufile");  
  if ($ufile =~m|/\.\./|) {  
     # any files paths with /../ in them refuse   
                             # to deal with  
     print $client "refused\n";  
  } else {  
     my $udir=propath($udom,$uname);  
     if (-e $udir) {  
  my $file=$udir.'/userfiles/'.$ufile;  
  if (-e $file) {  
     unlink($file);  
     if (-e $file) {  
  print $client "failed\n";  
     } else {  
  print $client "ok\n";  
     }  
  } else {  
     print $client "not_found\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=~ m|userfile\.\Q$fname\E\=|) { $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 $client &unsub($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,5);  
  $namespace=~s/\//\_/g;  
  $namespace=~s/\W//g;  
  if ($namespace ne 'roles') {  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',  
     "$proname/$namespace.db",  
     &GDBM_WRCREAT(),0640)) {  
  unless ($namespace=~/^nohist\_/) {  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }  
  }  
   
  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 $now=time;  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',  
     "$proname/$namespace.db",  
     &GDBM_WRCREAT(),0640)) {  
  unless ($namespace=~/^nohist\_/) {  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }  
  }  
  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 inc\n";  
  }  
     } else {  
  print $client "error: ".($!)  
     ." tie(GDBM) Failed ".  
     "while attempting inc\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 $now=time;  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
  {  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {   
  print $hfh "P:$now:$exedom:$exeuser:$what\n";  
     }  
  }  
   
  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 $now=time;  
     my @rolekeys=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
  {  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {   
  print $hfh "D:$now:$exedom:$exeuser:$what\n";  
     }  
  }  
  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 $now=time;  
  my @keys=split(/\&/,$what);  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
     unless ($namespace=~/^nohist\_/) {  
  my $hfh;  
  if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "D:$now:$what\n"; }  
     }  
     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/$namespace.db",&GDBM_READER(),0640)) {  
        while (my ($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 $now=time;  
     my @pairs=split(/\&/,$what);  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
  unless ($namespace=~/^nohist\_/) {  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {  
  print $hfh "P:$now:$rid:$what\n";  
     }  
  }  
  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,$descr,$inst_code)=split(/=/,$pair);  
  $hash{$key}=$descr.':'.$inst_code.':'.$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,$inst_code);  
                                 if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {  
     ($descr,$inst_code,$lasttime)=($1,$2,$3);  
                                 } else {  
                                     ($descr,$lasttime) = split(/\:/,$value);  
                                 }  
  if ($lasttime<$since) { next; }  
  if ($description eq '.') {  
     $qresult.=$key.'='.$descr.':'.$inst_code.'&';  
  } else {  
     my $unescapeVal = &unescape($descr);  
     if (eval('$unescapeVal=~/\Q$description\E/i')) {  
  $qresult.=$key.'='.$descr.':'.$inst_code.'&';  
     }  
  }  
     }  
     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 $now=time;  
  my @pairs=split(/\&/,$what);  
  my %hash;  
  if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {  
     {  
  my $hfh;  
  if ($hfh=IO::File->new(">>$proname.hist")) {  
     print $hfh "P:$now:$what\n";  
  }  
     }  
     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);  
        
     }  
 # ----------------------------------------- portfolio directory list (portls)  
                 } elsif ($userinput =~ /^portls/) {  
                     if(isClient) {  
                         my ($cmd,$uname,$udom)=split(/:/,$userinput);  
                         my $udir=propath($udom,$uname).'/userfiles/portfolio';  
                         my $dirLine='';  
                         my $dirContents='';  
                         if (opendir(LSDIR,$udir.'/')){  
                             while ($dirLine = readdir(LSDIR)){  
                                 $dirContents = $dirContents.$dirLine.'<br />';  
                             }  
                         } else {  
                             $dirContents = "No directory found\n";  
                         }  
                         print $client $dirContents."\n";  
                     } else {  
                         Reply($client, "refused\n", $userinput);  
                     }  
 # -------------------------------------------------------------------------- ls  
  } elsif ($userinput =~ /^ls/) {  
     if(isClient) {  
  my $obs;  
  my $rights;  
  my ($cmd,$ulsdir)=split(/:/,$userinput);  
  my $ulsout='';  
  my $ulsfn;  
  if (-e $ulsdir) {  
     if(-d $ulsdir) {  
  if (opendir(LSDIR,$ulsdir)) {  
     while ($ulsfn=readdir(LSDIR)) {  
  undef $obs, $rights;   
  my @ulsstats=stat($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)|) { $obs = 1; }   
  if($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'; }  
  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 $client "refused\n";  
     }  
 #------------------------------- is auto-enrollment enabled?  
                 } elsif ($userinput =~/^autorun:/) {  
                     if (isClient) {  
                         my ($cmd,$cdom) = split(/:/,$userinput);  
                         my $outcome = &localenroll::run($cdom);  
                         print $client "$outcome\n";  
                     } else {  
                         print $client "0\n";  
                     }  
 #------------------------------- get official sections (for auto-enrollment).  
                 } elsif ($userinput =~/^autogetsections:/) {  
                     if (isClient) {  
                         my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);  
                         my @secs = &localenroll::get_sections($coursecode,$cdom);  
                         my $seclist = &escape(join(':',@secs));  
                         print $client "$seclist\n";  
                     } else {  
                         print $client "refused\n";  
                     }  
 #----------------------- validate owner of new course section (for auto-enrollment).  
                 } elsif ($userinput =~/^autonewcourse:/) {  
                     if (isClient) {  
                         my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);  
                         my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);  
                         print $client "$outcome\n";  
                     } else {  
                         print $client "refused\n";  
                     }  
 #-------------- validate course section in schedule of classes (for auto-enrollment).  
                 } elsif ($userinput =~/^autovalidatecourse:/) {  
                     if (isClient) {  
                         my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);  
                         my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);  
                         print $client "$outcome\n";  
                     } else {  
                         print $client "refused\n";  
                     }  
 #--------------------------- create password for new user (for auto-enrollment).  
                 } elsif ($userinput =~/^autocreatepassword:/) {  
                     if (isClient) {  
                         my ($cmd,$authparam,$cdom)=split(/:/,$userinput);  
                         my ($create_passwd,$authchk);  
                         ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);  
                         print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";  
                     } else {  
                         print $client "refused\n";  
                     }  
 #---------------------------  read and remove temporary files (for auto-enrollment).  
                 } elsif ($userinput =~/^autoretrieve:/) {  
                     if (isClient) {  
                         my ($cmd,$filename) = split(/:/,$userinput);  
                         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);  
                                 print $client &escape($reply)."\n";  
 #                                unlink($source);  
                             } else {  
                                 print $client "error\n";  
                             }  
                         } else {  
                             print $client "error\n";  
                         }  
                     } else {  
                         print $client "refused\n";  
                     }  
 #---------------------  read and retrieve institutional code format (for support form).  
                 } elsif ($userinput =~/^autoinstcodeformat:/) {  
                     if (isClient) {  
                         my $reply;  
                         my($cmd,$cdom,$course) = split(/:/,$userinput);  
                         my @pairs = split/\&/,$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);  
                             print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\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." ($keymode)");   &status('Listening to '.$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>");
  }   }
     }                   }            
           
 # =============================================================================  # =============================================================================
           
Line 3507  sub make_new_child { Line 6563  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 3520  sub make_new_child { Line 6606  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, $domain, $user, $authtype) = @_;
   
       &Debug("manage_permissions: $request $domain $user $authtype");
   
     # See if the request is of the form /$domain/_au      # See if the request is of the form /$domain/_au
     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...      if($request =~ /^(\/\Q$domain\E\/_au)$/) { # 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;
       }
   }
   
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  #   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;
       }
   
   }
   
 #     Returns the authorization type or nouser if there is no such user.  
 #  #
 sub GetAuthType   #   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.
   #
   sub get_auth_type {
     my ($domain, $user)  = @_;      my ($domain, $user)  = @_;
   
     Debug("GetAuthType( $domain, $user ) \n");      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 3553  sub GetAuthType Line 6705  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;   Debug("Returning nouser");
    return "nouser";
       }
   }
   
   #
   #  Validate a user given their domain, name and password.  This utility
   #  function is used by both  AuthenticateHandler and ChangePasswordHandler
   #  to validate the login credentials of a user.
   # Parameters:
   #    $domain    - The domain being logged into (this is required due to
   #                 the capability for multihomed systems.
   #    $user      - The name of the user being validated.
   #    $password  - The user's propoposed password.
   #
   # Returns:
   #     1        - The domain,user,pasword triplet corresponds to a valid
   #                user.
   #     0        - The domain,user,password triplet is not a valid user.
   #
   sub validate_user {
       my ($domain, $user, $password, $checkdefauth) = @_;
   
       # Why negative ~pi you may well ask?  Well this function is about
       # authentication, and therefore very important to get right.
       # I've initialized the flag that determines whether or not I've 
       # validated correctly to a value it's not supposed to get.
       # At the end of this function. I'll ensure that it's not still that
       # value so we don't just wind up returning some accidental value
       # as a result of executing an unforseen code path that
       # did not set $validated.  At the end of valid execution paths,
       # validated shoule be 1 for success or 0 for failuer.
   
       my $validated = -3.14159;
   
       #  How we authenticate is determined by the type of authentication
       #  the user has been assigned.  If the authentication type is
       #  "nouser", the user does not exist so we will return 0.
   
       my $contents = &get_auth_type($domain, $user);
       my ($howpwd, $contentpwd) = split(/:/, $contents);
   
       my $null = pack("C",0); # Used by kerberos auth types.
   
       if ($howpwd eq 'nouser') {
           if ($checkdefauth) {
               my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
               if ($domdefaults{'auth_def'} eq 'localauth') {
                   $howpwd = $domdefaults{'auth_def'};
                   $contentpwd = $domdefaults{'auth_arg_def'};
               } elsif ((($domdefaults{'auth_def'} eq 'krb4') || 
                         ($domdefaults{'auth_def'} eq 'krb5')) &&
                        ($domdefaults{'auth_arg_def'} ne '')) {
                   $howpwd = $domdefaults{'auth_def'};
                   $contentpwd = $domdefaults{'auth_arg_def'}; 
               }
           }
       } 
       if ($howpwd ne 'nouser') {
    if($howpwd eq "internal") { # Encrypted is in local password file.
       $validated = (crypt($password, $contentpwd) eq $contentpwd);
  }   }
    elsif ($howpwd eq "unix") { # User is a normal unix user.
       $contentpwd = (getpwnam($user))[1];
       if($contentpwd) {
    if($contentpwd eq 'x') { # Shadow password file...
       my $pwauth_path = "/usr/local/sbin/pwauth";
       open PWAUTH,  "|$pwauth_path" or
    die "Cannot invoke authentication";
       print PWAUTH "$user\n$password\n";
       close PWAUTH;
       $validated = ! $?;
   
    } else {         # Passwords in /etc/passwd. 
       $validated = (crypt($password,
    $contentpwd) eq $contentpwd);
    }
       } else {
    $validated = 0;
       }
    } elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
               my $checkwithkrb5 = 0;
               if ($dist =~/^fedora(\d+)$/) {
                   if ($1 > 11) {
                       $checkwithkrb5 = 1;
                   }
               } elsif ($dist =~ /^suse([\d.]+)$/) {
                   if ($1 > 11.1) {
                       $checkwithkrb5 = 1; 
                   }
               }
               if ($checkwithkrb5) {
                   $validated = &krb5_authen($password,$null,$user,$contentpwd);
               } else {
                   $validated = &krb4_authen($password,$null,$user,$contentpwd);
               }
    } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
               $validated = &krb5_authen($password,$null,$user,$contentpwd);
    } elsif ($howpwd eq "localauth") { 
       #  Authenticate via installation specific authentcation method:
       $validated = &localauth::localauth($user, 
          $password, 
          $contentpwd,
          $domain);
       if ($validated < 0) {
    &logthis("localauth for $contentpwd $user:$domain returned a $validated");
    $validated = 0;
       }
    } else { # Unrecognized auth is also bad.
       $validated = 0;
    }
       } else {
    $validated = 0;
       }
       #
       #  $validated has the correct stat of the authentication:
       #
   
  return "$authtype:$availinfo";      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 krb4_authen {
       my ($password,$null,$user,$contentpwd) = @_;
       my $validated = 0;
       if (!($password =~ /$null/) ) {  # Null password not allowed.
           eval {
               require Authen::Krb4;
           };
           if (!$@) {
               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 {
               $validated = krb5_authen($password,$null,$user,$contentpwd);
           }
     }      }
     else {      return $validated;
  Debug("Returning nouser");  }
  return "nouser";  
   sub krb5_authen {
       my ($password,$null,$user,$contentpwd) = @_;
       my $validated = 0;
       if(!($password =~ /$null/)) { # Null password not allowed.
           my $krbclient = &Authen::Krb5::parse_name($user.'@'
                                                     .$contentpwd);
           my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
           my $krbserver  = &Authen::Krb5::parse_name($krbservice);
           my $credentials= &Authen::Krb5::cc_default();
           $credentials->initialize(&Authen::Krb5::parse_name($user.'@'
                                                               .$contentpwd));
           my $krbreturn;
           if (exists(&Authen::Krb5::get_init_creds_password)) {
               $krbreturn =
                   &Authen::Krb5::get_init_creds_password($krbclient,$password,
                                                             $krbservice);
               $validated = (ref($krbreturn) eq 'Authen::Krb5::Creds');
           } else {
               $krbreturn  =
                   &Authen::Krb5::get_in_tkt_with_password($krbclient,$krbserver,
                                                            $password,$credentials);
               $validated = ($krbreturn == 1);
           }
           if (!$validated) {
               &logthis('krb5: '.$user.', '.$contentpwd.', '.
                        &Authen::Krb5::error());
           }
     }      }
       return $validated;
 }  }
   
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
     my $found=0;      my $found=0;
     my $expr='^'.$hostid.':'.$ip.':';      my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
     $expr =~ s/\./\\\./g;  
     my $sh;      my $sh;
     if ($sh=IO::File->new("$fname.subscription")) {      if ($sh=IO::File->new("$fname.subscription")) {
  while (my $subline=<$sh>) {   while (my $subline=<$sh>) {
Line 3586  sub addline { Line 6914  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 3629  sub chatadd { Line 6969  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);
     }      }
 }  }
   
Line 3732  sub thisversion { Line 7073  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 3765  sub subscribe { Line 7106  sub subscribe {
                 # the metadata                  # the metadata
  unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }   unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
  $fname=~s/\/home\/httpd\/html\/res/raw/;   $fname=~s/\/home\/httpd\/html\/res/raw/;
  $fname="http://$thisserver/".$fname;   $fname="http://".&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
  $result="$fname\n";   $result="$fname\n";
     }      }
  } else {   } else {
Line 3776  sub subscribe { Line 7117  sub subscribe {
     }      }
     return $result;      return $result;
 }  }
   #  Change the passwd of a unix user.  The caller must have
   #  first verified that the user is a loncapa user.
   #
   # Parameters:
   #    user      - Unix user name to change.
   #    pass      - New password for the user.
   # Returns:
   #    ok    - if success
   #    other - Some meaningfule error message string.
   # NOTE:
   #    invokes a setuid script to change the passwd.
   sub change_unix_password {
       my ($user, $pass) = @_;
   
       &Debug("change_unix_password");
       my $execdir=$perlvar{'lonDaemons'};
       &Debug("Opening lcpasswd pipeline");
       my $pf = IO::File->new("|$execdir/lcpasswd > "
      ."$perlvar{'lonDaemons'}"
      ."/logs/lcpasswd.log");
       print $pf "$user\n$pass\n$pass\n";
       close $pf;
       my $err = $?;
       return ($err < @passwderrors) ? $passwderrors[$err] : 
    "pwchange_falure - unknown error";
   
       
   }
   
   
 sub make_passwd_file {  sub make_passwd_file {
     my ($uname, $umode,$npass,$passfilename)=@_;      my ($uname, $umode,$npass,$passfilename)=@_;
     my $result="ok\n";      my $result="ok";
     if ($umode eq 'krb4' or $umode eq 'krb5') {      if ($umode eq 'krb4' or $umode eq 'krb5') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new(">$passfilename");
     print $pf "$umode:$npass\n";      if ($pf) {
    print $pf "$umode:$npass\n";
       } else {
    $result = "pass_file_failed_error";
       }
  }   }
     } elsif ($umode eq 'internal') {      } elsif ($umode eq 'internal') {
  my $salt=time;   my $salt=time;
Line 3792  sub make_passwd_file { Line 7166  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 3811  sub make_passwd_file { Line 7193  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 3819  sub make_passwd_file { Line 7203  sub make_passwd_file {
  print $se "$uname\n";   print $se "$uname\n";
  print $se "$npass\n";   print $se "$npass\n";
  print $se "$npass\n";   print $se "$npass\n";
    print $se "$lc_error_file\n"; # Status -> unique file.
     }      }
     my $useraddok = $?;      if (-r $lc_error_file) {
     if($useraddok > 0) {   &Debug("Opening error file: $lc_error_file");
  &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));   my $error = IO::File->new("< $lc_error_file");
    my $useraddok = <$error>;
    $error->close;
    unlink($lc_error_file);
   
    chomp $useraddok;
   
    if($useraddok > 0) {
       my $error_text = &lcuseraddstrerror($useraddok);
       &logthis("Failed lcuseradd: $error_text");
       $result = "lcuseradd_failed:$error_text";
    }  else {
       my $pf = IO::File->new(">$passfilename");
       if($pf) {
    print $pf "unix:\n";
       } else {
    $result = "pass_file_failed_error";
       }
    }
       }  else {
    &Debug("Could not locate lcuseradd error: $lc_error_file");
    $result="bug_lcuseradd_no_output_file";
     }      }
     my $pf = IO::File->new(">$passfilename");  
     print $pf "unix:\n";  
  }   }
     } elsif ($umode eq 'none') {      } elsif ($umode eq 'none') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new("> $passfilename");
     print $pf "none:\n";      if($pf) {
    print $pf "none:\n";
       } else {
    $result = "pass_file_failed_error";
       }
  }   }
     } else {      } else {
  $result="auth_mode_error\n";   $result="auth_mode_error";
     }      }
     return $result;      return $result;
 }  }
   
   sub convert_photo {
       my ($start,$dest)=@_;
       system("convert $start $dest");
   }
   
 sub sethost {  sub sethost {
     my ($remotereq) = @_;      my ($remotereq) = @_;
     my (undef,$hostid)=split(/:/,$remotereq);      my (undef,$hostid)=split(/:/,$remotereq);
       # ignore sethost if we are already correct
       if ($hostid eq $currenthostid) {
    return 'ok';
       }
   
     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {      if (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'}) 
    eq &Apache::lonnet::get_host_ip($hostid)) {
  $currenthostid  =$hostid;   $currenthostid  =$hostid;
  $currentdomainid=$hostdom{$hostid};   $currentdomainid=&Apache::lonnet::host_domain($hostid);
  &logthis("Setting hostid to $hostid, and domain to $currentdomainid");  # &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {      } else {
  &logthis("Requested host id $hostid not an alias of ".   &logthis("Requested host id $hostid not an alias of ".
  $perlvar{'lonHostID'}." refusing connection");   $perlvar{'lonHostID'}." refusing connection");
Line 3860  sub version { Line 7279  sub version {
     return "version:$VERSION";      return "version:$VERSION";
 }  }
   
 #There is a copy of this in lonnet.pm  sub get_usersession_config {
 sub userload {      my ($dom,$name) = @_;
     my $numusers=0;      my ($usersessionconf,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
     {      if (defined($cached)) {
  opendir(LONIDS,$perlvar{'lonIDsDir'});          return $usersessionconf;
  my $filename;      } else {
  my $curtime=time;          my %domconfig = &Apache::lonnet::get_dom('configuration',['usersessions'],$dom);
  while ($filename=readdir(LONIDS)) {          if (ref($domconfig{'usersessions'}) eq 'HASH') {
     if ($filename eq '.' || $filename eq '..') {next;}              &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'usersessions'},3600);
     my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];              return $domconfig{'usersessions'};
     if ($curtime-$mtime < 1800) { $numusers++; }          }
  }      }
  closedir(LONIDS);      return;
     }  }
     my $userloadpercent=0;  
     my $maxuserload=$perlvar{'lonUserLoadLim'};  sub releasereqd_check {
     if ($maxuserload) {      my ($cnum,$cdom,$key,$value,$major,$minor,$now,$homecourses,$ids) = @_;
  $userloadpercent=100*$numusers/$maxuserload;      my $home = &Apache::lonnet::homeserver($cnum,$cdom);
     }      return if ($home eq 'no_host');
     $userloadpercent=sprintf("%.2f",$userloadpercent);      my ($reqdmajor,$reqdminor,$displayrole);
     return $userloadpercent;      if ($cnum =~ /$LONCAPA::match_community/) {
 }          if ($major eq '' && $minor eq '') {
               return unless ((ref($ids) eq 'ARRAY') && 
 # Routines for serializing arrays and hashes (copies from lonnet)                             (grep(/^\Q$home\E$/,@{$ids})));
           } else {
 sub array2str {              $reqdmajor = 2;
   my (@array) = @_;              $reqdminor = 9;
   my $result=&arrayref2str(\@array);              return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
   $result=~s/^__ARRAY_REF__//;          }
   $result=~s/__END_ARRAY_REF__$//;      }
   return $result;      my ($role,$end,$start) = split(/_/,$value);
 }      if (!$end || $end > $now) {
                                                                                            my $hashid = $cdom.':'.$cnum;
 sub arrayref2str {          my ($courseinfo,$cached) =
   my ($arrayref) = @_;              &Apache::lonnet::is_cached_new('courseinfo',$hashid);
   my $result='__ARRAY_REF__';          if (defined($cached)) {
   foreach my $elem (@$arrayref) {              if (ref($courseinfo) eq 'HASH') {
     if(ref($elem) eq 'ARRAY') {                  if (exists($courseinfo->{'releaserequired'})) {
       $result.=&arrayref2str($elem).'&';                      my ($reqdmajor,$reqdminor) = split(/\./,$courseinfo->{'releaserequired'});
     } elsif(ref($elem) eq 'HASH') {                      return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
       $result.=&hashref2str($elem).'&';                  }
     } elsif(ref($elem)) {              }
       #print("Got a ref of ".(ref($elem))." skipping.");          } else {
     } else {              if (ref($ids) eq 'ARRAY') {
       $result.=&escape($elem).'&';                  if (grep(/^\Q$home\E$/,@{$ids})) {
     }                      if (ref($homecourses) eq 'HASH') {
   }                          if (ref($homecourses->{$hashid}) eq 'ARRAY') {
   $result=~s/\&$//;                              push(@{$homecourses->{$hashid}},{$key=>$value});
   $result .= '__END_ARRAY_REF__';                          } else {
   return $result;                              $homecourses->{$hashid} = [{$key=>$value}];
 }                          }
                                                                                                        }
 sub hash2str {                      return;
   my (%hash) = @_;                  }
   my $result=&hashref2str(\%hash);              }
   $result=~s/^__HASH_REF__//;              my $courseinfo = &get_courseinfo_hash($cnum,$cdom,$home);
   $result=~s/__END_HASH_REF__$//;              if (ref($courseinfo) eq 'HASH') {
   return $result;                  if (exists($courseinfo->{'releaserequired'})) {
 }                      my ($reqdmajor,$reqdminor) = split(/\./,$courseinfo->{'releaserequired'});
                                                                                                        return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
 sub hashref2str {                  }
   my ($hashref)=@_;              }
   my $result='__HASH_REF__';          }
   foreach (sort(keys(%$hashref))) {      }
     if (ref($_) eq 'ARRAY') {      return 1;
       $result.=&arrayref2str($_).'=';  }
     } elsif (ref($_) eq 'HASH') {  
       $result.=&hashref2str($_).'=';  sub get_courseinfo_hash {
     } elsif (ref($_)) {      my ($cnum,$cdom,$home) = @_;
       $result.='=';      my $hashid = $cdom.':'.$cnum;
       #print("Got a ref of ".(ref($_))." skipping.");      my %info = &Apache::lonnet::courseiddump($cdom,'.',1,'.','.',$cnum,1,[$home],'.');
     } else {      if (ref($info{$cdom.'_'.$cnum}) eq 'HASH') {
         if ($_) {$result.=&escape($_).'=';} else { last; }          return &Apache::lonnet::do_cache_new('courseinfo',$hashid,$info{$cdom.'_'.$cnum},600);
     }      }
       return;
     if(ref($hashref->{$_}) eq 'ARRAY') {  }
       $result.=&arrayref2str($hashref->{$_}).'&';  
     } elsif(ref($hashref->{$_}) eq 'HASH') {  sub check_homecourses {
       $result.=&hashref2str($hashref->{$_}).'&';      my ($homecourses,$udom,$regexp,$count,$range,$start,$end,$major,$minor) = @_;
     } elsif(ref($hashref->{$_})) {      my ($result,%addtocache);
        $result.='&';      if (ref($homecourses) eq 'HASH') {
       #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");          my %okcourses;
     } else {          my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       $result.=&escape($hashref->{$_}).'&';          if ($hashref) {
     }              while (my ($key,$value) = each(%$hashref)) {
   }                  my $unesc_key = &unescape($key);
   $result=~s/\&$//;                  next if ($unesc_key =~ /^lasttime:/);
   $result .= '__END_HASH_REF__';                  my $items = &Apache::lonnet::thaw_unescape($value);
   return $result;                  if (ref($items) eq 'HASH') {
                       my $hashid = $unesc_key;
                       $hashid =~ s/_/:/;
                       &Apache::lonnet::do_cache_new('courseinfo',$hashid,$items,600);
                       if (ref($homecourses->{$hashid}) eq 'ARRAY') {
                           my ($reqdmajor,$reqdminor) = split(/\./,$items->{'releaserequired'});
                           if (&useable_role($reqdmajor,$reqdminor,$major,$minor)) {
                               $okcourses{$hashid} = 1;
                           }
                       }
                   }
               }
               unless (&untie_domain_hash($hashref)) {
                   &logthis('Failed to untie tied hash for nohist_courseids.db');
               }
           } else {
               &logthis('Failed to tie hash for nohist_courseids.db');
               return;
           }
           foreach my $hashid (keys(%okcourses)) {
               if (ref($homecourses->{$hashid}) eq 'ARRAY') {
                   foreach my $role (@{$homecourses->{$hashid}}) {
                       if (ref($role) eq 'HASH') {
                           while (my ($key,$value) = each(%{$role})) {
                               if ($regexp eq '.') {
                                   $count++;
                                   if (defined($range) && $count >= $end)   { last; }
                                   if (defined($range) && $count <  $start) { next; }
                                   $result.=$key.'='.$value.'&';
                               } else {
                                   my $unescapeKey = &unescape($key);
                                   if (eval('$unescapeKey=~/$regexp/')) {
                                       $count++;
                                       if (defined($range) && $count >= $end)   { last; }
                                       if (defined($range) && $count <  $start) { next; }
                                       $result.="$key=$value&";
                                   }
                               }
                           }
                       }
                   }
               }
           }
       }
       return $result;
   }
   
   sub useable_role {
       my ($reqdmajor,$reqdminor,$major,$minor) = @_; 
       if ($reqdmajor ne '' && $reqdminor ne '') {
           return if (($major eq '' && $minor eq '') ||
                      ($major < $reqdmajor) ||
                      (($major == $reqdmajor) && ($minor < $reqdminor)));
       }
       return 1;
 }  }
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  # ----------------------------------- POD (plain old documentation, CPAN style)
Line 4158  Place in B<logs/lond.log> Line 7631  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 4266  to the client, and the connection is clo Line 7739  to the client, and the connection is clo
 IO::Socket  IO::Socket
 IO::File  IO::File
 Apache::File  Apache::File
 Symbol  
 POSIX  POSIX
 Crypt::IDEA  Crypt::IDEA
 LWP::UserAgent()  LWP::UserAgent()
Line 4285  linux Line 7757  linux
 Server/Process  Server/Process
   
 =cut  =cut
   
   
   =pod
   
   =head1 LOG MESSAGES
   
   The messages below can be emitted in the lond log.  This log is located
   in ~httpd/perl/logs/lond.log  Many log messages have HTML encapsulation
   to provide coloring if examined from inside a web page. Some do not.
   Where color is used, the colors are; Red for sometihhng to get excited
   about and to follow up on. Yellow for something to keep an eye on to
   be sure it does not get worse, Green,and Blue for informational items.
   
   In the discussions below, sometimes reference is made to ~httpd
   when describing file locations.  There isn't really an httpd 
   user, however there is an httpd directory that gets installed in the
   place that user home directories go.  On linux, this is usually
   (always?) /home/httpd.
   
   
   Some messages are colorless.  These are usually (not always)
   Green/Blue color level messages.
   
   =over 2
   
   =item (Red)  LocalConnection rejecting non local: <ip> ne 127.0.0.1
   
   A local connection negotiation was attempted by
   a host whose IP address was not 127.0.0.1.
   The socket is closed and the child will exit.
   lond has three ways to establish an encyrption
   key with a client:
   
   =over 2
   
   =item local 
   
   The key is written and read from a file.
   This is only valid for connections from localhost.
   
   =item insecure 
   
   The key is generated by the server and
   transmitted to the client.
   
   =item  ssl (secure)
   
   An ssl connection is negotiated with the client,
   the key is generated by the server and sent to the 
   client across this ssl connection before the
   ssl connectionis terminated and clear text
   transmission resumes.
   
   =back
   
   =item (Red) LocalConnection: caller is insane! init = <init> and type = <type>
   
   The client is local but has not sent an initialization
   string that is the literal "init:local"  The connection
   is closed and the child exits.
   
   =item Red CRITICAL Can't get key file <error>        
   
   SSL key negotiation is being attempted but the call to
   lonssl::KeyFile  failed.  This usually means that the
   configuration file is not correctly defining or protecting
   the directories/files lonCertificateDirectory or
   lonnetPrivateKey
   <error> is a string that describes the reason that
   the key file could not be located.
   
   =item (Red) CRITICAL  Can't get certificates <error>  
   
   SSL key negotiation failed because we were not able to retrives our certificate
   or the CA's certificate in the call to lonssl::CertificateFile
   <error> is the textual reason this failed.  Usual reasons:
   
   =over 2
          
   =item Apache config file for loncapa  incorrect:
    
   one of the variables 
   lonCertificateDirectory, lonnetCertificateAuthority, or lonnetCertificate
   undefined or incorrect
   
   =item Permission error:
   
   The directory pointed to by lonCertificateDirectory is not readable by lond
   
   =item Permission error:
   
   Files in the directory pointed to by lonCertificateDirectory are not readable by lond.
   
   =item Installation error:                         
   
   Either the certificate authority file or the certificate have not
   been installed in lonCertificateDirectory.
   
   =item (Red) CRITICAL SSL Socket promotion failed:  <err> 
   
   The promotion of the connection from plaintext to SSL failed
   <err> is the reason for the failure.  There are two
   system calls involved in the promotion (one of which failed), 
   a dup to produce
   a second fd on the raw socket over which the encrypted data
   will flow and IO::SOcket::SSL->new_from_fd which creates
   the SSL connection on the duped fd.
   
   =item (Blue)   WARNING client did not respond to challenge 
   
   This occurs on an insecure (non SSL) connection negotiation request.
   lond generates some number from the time, the PID and sends it to
   the client.  The client must respond by echoing this information back.
   If the client does not do so, that's a violation of the challenge
   protocols and the connection will be failed.
   
   =item (Red) No manager table. Nobody can manage!!    
   
   lond has the concept of privileged hosts that
   can perform remote management function such
   as update the hosts.tab.   The manager hosts
   are described in the 
   ~httpd/lonTabs/managers.tab file.
   this message is logged if this file is missing.
   
   
   =item (Green) Registering manager <dnsname> as <cluster_name> with <ipaddress>
   
   Reports the successful parse and registration
   of a specific manager. 
   
   =item Green existing host <clustername:dnsname>  
   
   The manager host is already defined in the hosts.tab
   the information in that table, rather than the info in the
   manager table will be used to determine the manager's ip.
   
   =item (Red) Unable to craete <filename>                 
   
   lond has been asked to create new versions of an administrative
   file (by a manager).  When this is done, the new file is created
   in a temp file and then renamed into place so that there are always
   usable administrative files, even if the update fails.  This failure
   message means that the temp file could not be created.
   The update is abandoned, and the old file is available for use.
   
   =item (Green) CopyFile from <oldname> to <newname> failed
   
   In an update of administrative files, the copy of the existing file to a
   backup file failed.  The installation of the new file may still succeed,
   but there will not be a back up file to rever to (this should probably
   be yellow).
   
   =item (Green) Pushfile: backed up <oldname> to <newname>
   
   See above, the backup of the old administrative file succeeded.
   
   =item (Red)  Pushfile: Unable to install <filename> <reason>
   
   The new administrative file could not be installed.  In this case,
   the old administrative file is still in use.
   
   =item (Green) Installed new < filename>.                      
   
   The new administrative file was successfullly installed.                                               
   
   =item (Red) Reinitializing lond pid=<pid>                    
   
   The lonc child process <pid> will be sent a USR2 
   signal.
   
   =item (Red) Reinitializing self                                    
   
   We've been asked to re-read our administrative files,and
   are doing so.
   
   =item (Yellow) error:Invalid process identifier <ident>  
   
   A reinit command was received, but the target part of the 
   command was not valid.  It must be either
   'lond' or 'lonc' but was <ident>
   
   =item (Green) isValideditCommand checking: Command = <command> Key = <key> newline = <newline>
   
   Checking to see if lond has been handed a valid edit
   command.  It is possible the edit command is not valid
   in that case there are no log messages to indicate that.
   
   =item Result of password change for  <username> pwchange_success
   
   The password for <username> was
   successfully changed.
   
   =item Unable to open <user> passwd to change password
   
   Could not rewrite the 
   internal password file for a user
   
   =item Result of password change for <user> : <result>
                                                                        
   A unix password change for <user> was attempted 
   and the pipe returned <result>  
   
   =item LWP GET: <message> for <fname> (<remoteurl>)
   
   The lightweight process fetch for a resource failed
   with <message> the local filename that should
   have existed/been created was  <fname> the
   corresponding URI: <remoteurl>  This is emitted in several
   places.
   
   =item Unable to move <transname> to <destname>     
   
   From fetch_user_file_handler - the user file was replicated but could not
   be mv'd to its final location.
   
   =item Looking for <domain> <username>              
   
   From user_has_session_handler - This should be a Debug call instead
   it indicates lond is about to check whether the specified user has a 
   session active on the specified domain on the local host.
   
   =item Client <ip> (<name>) hanging up: <input>     
   
   lond has been asked to exit by its client.  The <ip> and <name> identify the
   client systemand <input> is the full exit command sent to the server.
   
   =item Red CRITICAL: ABNORMAL EXIT. child <pid> for server <hostname> died through a crass with this error->[<message>].
                                                    
   A lond child terminated.  NOte that this termination can also occur when the
   child receives the QUIT or DIE signals.  <pid> is the process id of the child,
   <hostname> the host lond is working for, and <message> the reason the child died
   to the best of our ability to get it (I would guess that any numeric value
   represents and errno value).  This is immediately followed by
   
   =item  Famous last words: Catching exception - <log> 
   
   Where log is some recent information about the state of the child.
   
   =item Red CRITICAL: TIME OUT <pid>                     
   
   Some timeout occured for server <pid>.  THis is normally a timeout on an LWP
   doing an HTTP::GET.
   
   =item child <pid> died                              
   
   The reaper caught a SIGCHILD for the lond child process <pid>
   This should be modified to also display the IP of the dying child
   $children{$pid}
   
   =item Unknown child 0 died                           
   A child died but the wait for it returned a pid of zero which really should not
   ever happen. 
   
   =item Child <which> - <pid> looks like we missed it's death 
   
   When a sigchild is received, the reaper process checks all children to see if they are
   alive.  If children are dying quite quickly, the lack of signal queuing can mean
   that a signal hearalds the death of more than one child.  If so this message indicates
   which other one died. <which> is the ip of a dead child
   
   =item Free socket: <shutdownretval>                
   
   The HUNTSMAN sub was called due to a SIGINT in a child process.  The socket is being shutdown.
   for whatever reason, <shutdownretval> is printed but in fact shutdown() is not documented
   to return anything. This is followed by: 
   
   =item Red CRITICAL: Shutting down                       
   
   Just prior to exit.
   
   =item Free socket: <shutdownretval>                 
   
   The HUPSMAN sub was called due to a SIGHUP.  all children get killsed, and lond execs itself.
   This is followed by:
   
   =item (Red) CRITICAL: Restarting                         
   
   lond is about to exec itself to restart.
   
   =item (Blue) Updating connections                        
   
   (In response to a USR2).  All the children (except the one for localhost)
   are about to be killed, the hosts tab reread, and Apache reloaded via apachereload.
   
   =item (Blue) UpdateHosts killing child <pid> for ip <ip>   
   
   Due to USR2 as above.
   
   =item (Green) keeping child for ip <ip> (pid = <pid>)    
   
   In response to USR2 as above, the child indicated is not being restarted because
   it's assumed that we'll always need a child for the localhost.
   
   
   =item Going to check on the children                
   
   Parent is about to check on the health of the child processes.
   Note that this is in response to a USR1 sent to the parent lond.
   there may be one or more of the next two messages:
   
   =item <pid> is dead                                 
   
   A child that we have in our child hash as alive has evidently died.
   
   =item  Child <pid> did not respond                   
   
   In the health check the child <pid> did not update/produce a pid_.txt
   file when sent it's USR1 signal.  That process is killed with a 9 signal, as it's
   assumed to be hung in some un-fixable way.
   
   =item Finished checking children                   
    
   Master processs's USR1 processing is cojmplete.
   
   =item (Red) CRITICAL: ------- Starting ------            
   
   (There are more '-'s on either side).  Lond has forked itself off to 
   form a new session and is about to start actual initialization.
   
   =item (Green) Attempting to start child (<client>)       
   
   Started a new child process for <client>.  Client is IO::Socket object
   connected to the child.  This was as a result of a TCP/IP connection from a client.
   
   =item Unable to determine who caller was, getpeername returned nothing
                                                     
   In child process initialization.  either getpeername returned undef or
   a zero sized object was returned.  Processing continues, but in my opinion,
   this should be cause for the child to exit.
   
   =item Unable to determine clientip                  
   
   In child process initialization.  The peer address from getpeername was not defined.
   The client address is stored as "Unavailable" and processing continues.
   
   =item (Yellow) INFO: Connection <ip> <name> connection type = <type>
                                                     
   In child initialization.  A good connectionw as received from <ip>.
   
   =over 2
   
   =item <name> 
   
   is the name of the client from hosts.tab.
   
   =item <type> 
   
   Is the connection type which is either 
   
   =over 2
   
   =item manager 
   
   The connection is from a manager node, not in hosts.tab
   
   =item client  
   
   the connection is from a non-manager in the hosts.tab
   
   =item both
   
   The connection is from a manager in the hosts.tab.
   
   =back
   
   =back
   
   =item (Blue) Certificates not installed -- trying insecure auth
   
   One of the certificate file, key file or
   certificate authority file could not be found for a client attempting
   SSL connection intiation.  COnnection will be attemptied in in-secure mode.
   (this would be a system with an up to date lond that has not gotten a 
   certificate from us).
   
   =item (Green)  Successful local authentication            
   
   A local connection successfully negotiated the encryption key. 
   In this case the IDEA key is in a file (that is hopefully well protected).
   
   =item (Green) Successful ssl authentication with <client>  
   
   The client (<client> is the peer's name in hosts.tab), has successfully
   negotiated an SSL connection with this child process.
   
   =item (Green) Successful insecure authentication with <client>
                                                      
   
   The client has successfully negotiated an  insecure connection withthe child process.
   
   =item (Yellow) Attempted insecure connection disallowed    
   
   The client attempted and failed to successfully negotiate a successful insecure
   connection.  This can happen either because the variable londAllowInsecure is false
   or undefined, or becuse the child did not successfully echo back the challenge
   string.
   
   
   =back
   
   =back
   
   
   =cut

Removed from v.1.211  
changed lines
  Added in v.1.453


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