loncom/lond - diff

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Diff for /loncom/lond between versions 1.228 and 1.277

-version 1.228, 2004/08/10 22:55:31
+version 1.277, 2005/02/06 07:39:49
  Line 46  use Authen::Krb5;
  use lib '/home/httpd/lib/perl/';
  use localauth;
  use localenroll;
+ use localstudentphoto;
  use File::Copy;
  use LONCAPA::ConfigFileEdit;
  use LONCAPA::lonlocal;
- Line 64  my $currentdomainid;
+ Line 65  my $currentdomainid;
  my $client;
  my $clientip;			# IP address of client.
- my $clientdns;			# DNS name of client.
  my $clientname;			# LonCAPA name of client.
  my $server;
  Line 177  sub ResetStatistics {
  #   $initcmd     - The full text of the init command.
  #
  # Implicit inputs:
- #    $clientdns  - The DNS name of the remote client.
  #    $thisserver - Our DNS name.
  #
  # Returns:
- Line 186  sub ResetStatistics {
+ Line 185  sub ResetStatistics {
  #
  sub LocalConnection {
      my ($Socket, $initcmd) = @_;
-     Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
+     Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
-     if($clientdns ne $thisserver) {
+     if($clientip ne "127.0.0.1") {
  	&logthis('<font color="red"> LocalConnection rejecting non local: '
- 		 ."$clientdns ne $thisserver </font>");
+ 		 ."$clientip ne $thisserver </font>");
  	close $Socket;
  	return undef;
      }  else {
- Line 331  sub InsecureConnection {
+ Line 330  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,
  #   this function will extract the certificate from the transaction
  #   request.  Note that at this point, the only concept of a certificate
- Line 1013  sub tie_user_hash {
+ Line 1047  sub tie_user_hash {
  	   $how, 0640)) {
  	# If this is a namespace for which a history is kept,
  	# make the history log entry:
- 	if (($namespace =~/^nohist\_/) && (defined($loghead))) {
+ 	if (($namespace !~/^nohist\_/) && (defined($loghead))) {
  	    my $args = scalar @_;
  	    Debug(" Opening history: $namespace $args");
  	    my $hfh = IO::File->new(">>$proname/$namespace.hist");
- Line 1030  sub tie_user_hash {
+ Line 1064  sub tie_user_hash {
  }
+ #   read_profile
+ #
+ #   Returns a set of specific entries from a user's profile file.
+ #   this is a utility function that is used by both get_profile_entry and
+ #   get_profile_entry_encrypted.
+ #
+ # Parameters:
+ #    udom       - Domain in which the user exists.
+ #    uname      - User's account name (loncapa account)
+ #    namespace  - The profile namespace to open.
+ #    what       - A set of & separated queries.
+ # Returns:
+ #    If all ok: - The string that needs to be shipped back to the user.
+ #    If failure - A string that starts with error: followed by the failure
+ #                 reason.. note that this probabyl gets shipped back to the
+ #                 user as well.
+ #
+ sub read_profile {
+     my ($udom, $uname, $namespace, $what) = @_;
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+         my @queries=split(/\&/,$what);
+         my $qresult='';
+ 	for (my $i=0;$i<=$#queries;$i++) {
+ 	    $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
+ 	}
+ 	$qresult=~s/\&$//;              # Remove trailing & from last lookup.
+ 	if (untie %$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
- Line 1051  sub tie_user_hash {
+ Line 1129  sub tie_user_hash {
  #      0       - Program should exit.
  #  Side effects:
  #      Reply information is sent to the client.
  sub ping_handler {
      my ($cmd, $tail, $client) = @_;
      Debug("$cmd $tail $client .. $currenthostid:");
- Line 1079  sub ping_handler {
+ Line 1156  sub ping_handler {
  #      0       - Program should exit.
  #  Side effects:
  #      Reply information is sent to the client.
  sub pong_handler {
      my ($cmd, $tail, $replyfd) = @_;
- Line 1134  sub establish_key_handler {
+ Line 1210  sub establish_key_handler {
  }
  &register_handler("ekey", \&establish_key_handler, 0, 1,1);
  #     Handler for the load command.  Returns the current system load average
  #     to the requestor.
  #
- Line 1169  sub load_handler {
+ Line 1244  sub load_handler {
      return 1;
  }
- register_handler("load", \&load_handler, 0, 1, 0);
+ &register_handler("load", \&load_handler, 0, 1, 0);
  #
  #   Process the userload request.  This sub returns to the client the current
- Line 1199  sub user_load_handler {
+ Line 1274  sub user_load_handler {
      return 1;
  }
- register_handler("userload", \&user_load_handler, 0, 1, 0);
+ &register_handler("userload", \&user_load_handler, 0, 1, 0);
  #   Process a request for the authorization type of a user:
  #   (userauth).
- Line 1235  sub user_authorization_type {
+ Line 1310  sub user_authorization_type {
  	my ($type,$otherinfo) = split(/:/,$result);
  	if($type =~ /^krb/) {
  	    $type = $result;
- 	}
+ 	} else {
- 	&Reply( $replyfd, "$type:\n", $userinput);
+             $type .= ':';
+         }
+ 	&Reply( $replyfd, "$type\n", $userinput);
      }
      return 1;
- Line 1256  sub user_authorization_type {
+ Line 1333  sub user_authorization_type {
  #      0       - Program should exit
  # Implicit Output:
  #    a reply is written to the client.
  sub push_file_handler {
      my ($cmd, $tail, $client) = @_;
- Line 1282  sub push_file_handler {
+ Line 1358  sub push_file_handler {
  }
  &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
+ #
+ #   du  - list the disk usuage of a directory recursively.
+ #
+ #   note: stolen code from the ls file handler
+ #   under construction by Rick Banghart
+ #    .
+ # Parameters:
+ #    $cmd        - The command that dispatched us (du).
+ #    $ududir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub du_handler {
+     my ($cmd, $ududir, $client) = @_;
+     my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
+     my $userinput = "$cmd:$ududir";
+     if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
+ 	&Failure($client,"refused\n","$cmd:$ududir");
+ 	return 1;
+     }
+     #  Since $ududir could have some nasties in it,
+     #  we will require that ududir is a valid
+     #  directory.  Just in case someone tries to
+     #  slip us a  line like .;(cd /home/httpd rm -rf*)
+     #  etc.
+     #
+     if (-d $ududir) {
+ 	#  And as Shakespeare would say to make
+ 	#  assurance double sure,
+ 	# use execute_command to ensure that the command is not executed in
+ 	# a shell that can screw us up.
+ 	my $duout = execute_command("du -ks $ududir");
+ 	$duout=~s/[^\d]//g; #preserve only the numbers
+ 	&Reply($client,"$duout\n","$cmd:$ududir");
+     } else {
+ 	&Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
+     }
+     return 1;
+ }
+ &register_handler("du", \&du_handler, 0, 1, 0);
+ #
+ #   ls  - list the contents of a directory.  For each file in the
+ #    selected directory the filename followed by the full output of
+ #    the stat function is returned.  The returned info for each
+ #    file are separated by ':'.  The stat fields are separated by &'s.
+ # Parameters:
+ #    $cmd        - The command that dispatched us (ls).
+ #    $ulsdir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub ls_handler {
+     my ($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, $rights;
+ 		    my @ulsstats=stat($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 '') { $ulsout='empty'; }
+     &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
+     return 1;
+ }
+ &register_handler("ls", \&ls_handler, 0, 1, 0);
  #   Process a reinit request.  Reinit requests that either
  #   lonc or lond be reinitialized so that an updated
- Line 1313  sub reinit_process_handler {
+ Line 1500  sub reinit_process_handler {
      }
      return 1;
  }
  &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
  #  Process the editing script for a table edit operation.
- Line 1355  sub edit_table_handler {
+ Line 1541  sub edit_table_handler {
      }
      return 1;
  }
- register_handler("edit", \&edit_table_handler, 1, 0, 1);
+ &register_handler("edit", \&edit_table_handler, 1, 0, 1);
  #
  #   Authenticate a user against the LonCAPA authentication
- Line 1411  sub authenticate_handler {
+ Line 1596  sub authenticate_handler {
      return 1;
  }
+ &register_handler("auth", \&authenticate_handler, 1, 1, 0);
- register_handler("auth", \&authenticate_handler, 1, 1, 0);
  #
  #   Change a user's password.  Note that this function is complicated by
- Line 1503  sub change_password_handler {
+ Line 1687  sub change_password_handler {
      return 1;
  }
- register_handler("passwd", \&change_password_handler, 1, 1, 0);
+ &register_handler("passwd", \&change_password_handler, 1, 1, 0);
  #
  #   Create a new user.  User in this case means a lon-capa user.
- Line 1543  sub add_user_handler {
+ Line 1726  sub add_user_handler {
  	if (-e $passfilename) {
  	    &Failure( $client, "already_exists\n", $userinput);
  	} else {
- 	    my @fpparts=split(/\//,$passfilename);
- 	    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
  	    my $fperror='';
- 	    for (my $i=3;$i<= ($#fpparts-1);$i++) {
+ 	    if (!&mkpath($passfilename)) {
- 		$fpnow.='/'.$fpparts[$i];
+ 		$fperror="error: ".($!+0)." mkdir failed while attempting "
- 		unless (-e $fpnow) {
+ 		    ."makeuser";
- 		    &logthis("mkdir $fpnow");
- 		    unless (mkdir($fpnow,0777)) {
- 			$fperror="error: ".($!+0)." mkdir failed while attempting "
- 			    ."makeuser";
- 		    }
- 		}
  	    }
  	    unless ($fperror) {
  		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
- Line 1611  sub change_authentication_handler {
+ Line 1786  sub change_authentication_handler {
  	chomp($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!!
  	    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", $userinput); # Fail the user now.
+ 	    &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
  	}
      }
      return 1;
- Line 1756  sub fetch_user_file_handler {
+ Line 1948  sub fetch_user_file_handler {
      my $userinput = "$cmd:$tail";
      my $fname           = $tail;
-     my ($udom,$uname,$ufile)=split(/\//,$fname);
+     my ($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/^[\.\~]+//;
- 	$ufile=~s/\///g;
+ 	# IF necessary, create the path right down to the file.
+ 	# Note that any regular files in the way of this path are
+ 	# wiped out to deal with some earlier folly of mine.
+ 	if (!&mkpath($udir.'/'.$ufile)) {
+ 	    &Failure($client, "unable_to_create\n", $userinput);
+ 	}
  	my $destname=$udir.'/'.$ufile;
  	my $transname=$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;
- Line 1781  sub fetch_user_file_handler {
+ Line 1983  sub fetch_user_file_handler {
  	    &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);
- Line 1805  sub fetch_user_file_handler {
+ Line 2008  sub fetch_user_file_handler {
  #
  # Returns:
  #    1    - Continue processing.
  sub remove_user_file_handler {
      my ($cmd, $tail, $client) = @_;
- Line 1821  sub remove_user_file_handler {
+ Line 2023  sub remove_user_file_handler {
  	if (-e $udir) {
  	    my $file=$udir.'/userfiles/'.$ufile;
  	    if (-e $file) {
- 		unlink($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:$tail");
- Line 1838  sub remove_user_file_handler {
+ Line 2051  sub remove_user_file_handler {
  }
  &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
+ #
+ #   make a directory in a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
+ #
+ # Returns:
+ #    1    - Continue processing.
+ sub mkdir_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
+     $dir=&unescape($dir);
+     my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     if ($ufile =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse
+ 	# to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $newdir=$udir.'/userfiles/'.$ufile.'/';
+ 	    if (!&mkpath($newdir)) {
+ 		&Failure($client, "failed\n", "$cmd:$tail");
+ 	    }
+ 	    &Reply($client, "ok\n", "$cmd:$tail");
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
+ #
+ #   rename a file in a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
+ #
+ # Returns:
+ #    1    - Continue processing.
+ sub rename_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($udom,$uname,$old,$new) = split(/:/, $tail);
+     $old=&unescape($old);
+     $new=&unescape($new);
+     if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $oldfile=$udir.'/userfiles/'.$old;
+ 	    my $newfile=$udir.'/userfiles/'.$new;
+ 	    if (-e $newfile) {
+ 		&Failure($client, "exists\n", "$cmd:$tail");
+ 	    } elsif (! -e $oldfile) {
+ 		&Failure($client, "not_found\n", "$cmd:$tail");
+ 	    } else {
+ 		if (!rename($oldfile,$newfile)) {
+ 		    &Failure($client, "failed\n", "$cmd:$tail");
+ 		} else {
+ 		    &Reply($client, "ok\n", "$cmd:$tail");
+ 		}
+ 	    }
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
  #
- #  Authenticate access to a user file by checking the user's
+ #  Authenticate access to a user file by checking that the token the user's
- #  session token(?)
+ #  passed also exists in their session file
  #
  # Parameters:
  #   cmd      - The request keyword that dispatched to tus.
- Line 1849  sub remove_user_file_handler {
+ Line 2138  sub remove_user_file_handler {
  #   client   - Filehandle open on the client.
  # Return:
  #    1.
  sub token_auth_user_file_handler {
      my ($cmd, $tail, $client) = @_;
      my ($fname, $session) = split(/:/, $tail);
      chomp($session);
-     my $reply='non_auth';
+     my $reply="non_auth\n";
      if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
  	     $session.'.id')) {
  	while (my $line=<ENVIN>) {
- 	    if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
+ 	    if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply="ok\n"; }
  	}
  	close(ENVIN);
- 	&Reply($client, $reply);
+ 	&Reply($client, $reply, "$cmd:$tail");
      } else {
  	&Failure($client, "invalid_token\n", "$cmd:$tail");
      }
      return 1;
  }
  &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
+ #
+ #   Unsubscribe from a resource.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub unsubscribe_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($fname) = split(/:/,$tail); # Split in case there's extrs.
+     &Debug("Unsubscribing $fname");
+     if (-e $fname) {
+ 	&Debug("Exists");
+ 	&Reply($client, &unsub($fname,$clientip), $userinput);
+     } else {
+ 	&Failure($client, "not_found\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
+ #   Subscribe to a resource
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub subscribe_handler {
+     my ($cmd, $tail, $client)= @_;
+     my $userinput  = "$cmd:$tail";
+     &Reply( $client, &subscribe($userinput,$clientip), $userinput);
+     return 1;
+ }
+ &register_handler("sub", \&subscribe_handler, 0, 1, 0);
+ #
+ #   Determine the version of a resource (?) Or is it return
+ #   the top version of the resource?  Not yet clear from the
+ #   code in currentversion.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub current_version_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my $fname   = $tail;
+     &Reply( $client, &currentversion($fname)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
+ #  Make an entry in a user's activity log.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub activity_log_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($udom,$uname,$what)=split(/:/,$tail);
+     chomp($what);
+     my $proname=&propath($udom,$uname);
+     my $now=time;
+     my $hfh;
+     if ($hfh=IO::File->new(">>$proname/activity.log")) {
+ 	print $hfh "$now:$clientname:$what\n";
+ 	&Reply( $client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)." IO::File->new Failed "
+ 		 ."while attempting log\n",
+ 		 $userinput);
+     }
+     return 1;
+ }
+ &register_handler("log", \&activity_log_handler, 0, 1, 0);
+ #
+ #   Put a namespace entry in a user profile hash.
+ #   My druthers would be for this to be an encrypted interaction too.
+ #   anything that might be an inadvertent covert channel about either
+ #   user authentication or user personal information....
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub put_user_profile_entry {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
+     if ($namespace ne 'roles') {
+ 	chomp($what);
+ 	my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				  &GDBM_WRCREAT(),"P",$what);
+ 	if($hashref) {
+ 	    my @pairs=split(/\&/,$what);
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+ 		$hashref->{$key}=$value;
+ 	    }
+ 	    if (untie(%$hashref)) {
+ 		&Reply( $client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ 			"while attempting put\n",
+ 			$userinput);
+ 	    }
+ 	} else {
+ 	    &Failure( $client, "error: ".($!)." 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);
+ #
+ #   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);
+ 		# We could check that we have a number...
+ 		if (! defined($value) || $value eq '') {
+ 		    $value = 1;
+ 		}
+ 		$hashref->{$key}+=$value;
+ 	    }
+ 	    if (untie(%$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}=$value;
+ 	}
+ 	if (untie($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(%$hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting rolesdel\n", $userinput);
+ 	}
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting rolesdel\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
+ # Unencrypted get from a user's profile database.  See
+ # GetProfileEntryEncrypted for a version that does end-to-end encryption.
+ # This function retrieves a keyed item from a specific named database in the
+ # user's directory.
+ #
+ # Parameters:
+ #   $cmd             - Command request keyword (get).
+ #   $tail            - Tail of the command.  This is a colon separated list
+ #                      consisting of the domain and username that uniquely
+ #                      identifies the profile,
+ #                      The 'namespace' which selects the gdbm file to
+ #                      do the lookup in,
+ #                      & separated list of keys to lookup.  Note that
+ #                      the values are returned as an & separated list too.
+ #   $client          - File descriptor open on the client.
+ # Returns:
+ #   1       - Continue processing.
+ #   0       - Exit.
+ #
+ sub get_profile_entry {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+     chomp($what);
+     my $replystring = read_profile($udom, $uname, $namespace, $what);
+     my ($first) = split(/:/,$replystring);
+     if($first ne "error") {
+ 	&Reply($client, "$replystring\n", $userinput);
+     } else {
+ 	&Failure($client, $replystring." while attempting get\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("get", \&get_profile_entry, 0,1,0);
+ #
+ #  Process the encrypted get request.  Note that the request is sent
+ #  in clear, but the reply is encrypted.  This is a small covert channel:
+ #  information about the sensitive keys is given to the snooper.  Just not
+ #  information about the values of the sensitive key.  Hmm if I wanted to
+ #  know these I'd snoop for the egets. Get the profile item names from them
+ #  and then issue a get for them since there's no enforcement of the
+ #  requirement of an encrypted get for particular profile items.  If I
+ #  were re-doing this, I'd force the request to be encrypted as well as the
+ #  reply.  I'd also just enforce encrypted transactions for all gets since
+ #  that would prevent any covert channel snooping.
+ #
+ #  Parameters:
+ #     $cmd               - Command keyword of request (eget).
+ #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
+ #     $client            - File open on the client.
+ #  Returns:
+ #     1      - Continue processing
+ #     0      - server should exit.
+ sub get_profile_entry_encrypted {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
+     chomp($what);
+     my $qresult = read_profile($udom, $uname, $namespace, $what);
+     my ($first) = split(/:/, $qresult);
+     if($first ne "error") {
+ 	if ($cipher) {
+ 	    my $cmdlength=length($qresult);
+ 	    $qresult.="         ";
+ 	    my $encqresult='';
+ 	    for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+ 		$encqresult.= unpack("H16",
+ 				     $cipher->encrypt(substr($qresult,
+ 							     $encidx,
+)));
+ 	    }
+ 	    &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->{$key});
+ 	}
+ 	if (untie(%$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(%$hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting keys\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting keys\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("keys", \&get_profile_keys, 0, 1, 0);
+ #
+ #   Dump the contents of a user profile database.
+ #   Note that this constitutes a very large covert channel too since
+ #   the dump will return sensitive information that is not encrypted.
+ #   The naive security assumption is that the session negotiation ensures
+ #   our client is trusted and I don't believe that's assured at present.
+ #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
+ #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
+ #
+ #  Parameters:
+ #     $cmd           - The command request keyword (currentdump).
+ #     $tail          - Remainder of the request, consisting of a colon
+ #                      separated list that has the domain/username and
+ #                      the namespace to dump (database file).
+ #     $client        - file open on the remote client.
+ # Returns:
+ #     1    - Continue processing.
+ #     0    - Exit the server.
+ #
+ sub dump_profile_database {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace) = split(/:/,$tail);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+ 	# Structure of %data:
+ 	# $data{$symb}->{$parameter}=$value;
+ 	# $data{$symb}->{'v.'.$parameter}=$version;
+ 	# since $parameter will be unescaped, we do not
+  	# have to worry about silly parameter names...
+         my $qresult='';
+ 	my %data = ();                     # A hash of anonymous hashes..
+ 	while (my ($key,$value) = each(%$hashref)) {
+ 	    my ($v,$symb,$param) = split(/:/,$key);
+ 	    next if ($v eq 'version' || $symb eq 'keys');
+ 	    next if (exists($data{$symb}) &&
+ 		     exists($data{$symb}->{$param}) &&
+ 		     $data{$symb}->{'v.'.$param} > $v);
+ 	    $data{$symb}->{$param}=$value;
+ 	    $data{$symb}->{'v.'.$param}=$v;
+ 	}
+ 	if (untie(%$hashref)) {
+ 	    while (my ($symb,$param_hash) = each(%data)) {
+ 		while(my ($param,$value) = each (%$param_hash)){
+ 		    next if ($param =~ /^v\./);       # Ignore versions...
+ 		    #
+ 		    #   Just dump the symb=value pairs separated by &
+ 		    #
+ 		    $qresult.=$symb.':'.$param.'='.$value.'&';
+ 		}
+ 	    }
+ 	    chop($qresult);
+ 	    &Reply($client , "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting currentdump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting currentdump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
+ #
+ #   Dump a profile database with an optional regular expression
+ #   to match against the keys.  In this dump, no effort is made
+ #   to separate symb from version information. Presumably the
+ #   databases that are dumped by this command are of a different
+ #   structure.  Need to look at this and improve the documentation of
+ #   both this and the currentdump handler.
+ # Parameters:
+ #    $cmd                     - The command keyword.
+ #    $tail                    - All of the characters after the $cmd:
+ #                               These are expected to be a colon
+ #                               separated list containing:
+ #                               domain/user - identifying the user.
+ #                               namespace   - identifying the database.
+ #                               regexp      - optional regular expression
+ #                                             that is matched against
+ #                                             database keywords to do
+ #                                             selective dumps.
+ #   $client                   - Channel open on the client.
+ # Returns:
+ #    1    - Continue processing.
+ # Side effects:
+ #    response is written to $client.
+ #
+ sub dump_with_regexp {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
+     if (defined($regexp)) {
+ 	$regexp=&unescape($regexp);
+     } else {
+ 	$regexp='.';
+     }
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+         my $qresult='';
+ 	while (my ($key,$value) = each(%$hashref)) {
+ 	    if ($regexp eq '.') {
+ 		$qresult.=$key.'='.$value.'&';
+ 	    } else {
+ 		my $unescapeKey = &unescape($key);
+ 		if (eval('$unescapeKey=~/$regexp/')) {
+ 		    $qresult.="$key=$value&";
+ 		}
+ 	    }
+ 	}
+ 	if (untie(%$hashref)) {
+ 	    chop($qresult);
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting dump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting dump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
+ #  Store a set of key=value pairs associated with a versioned name.
+ #
+ #  Parameters:
+ #    $cmd                - Request command keyword.
+ #    $tail               - Tail of the request.  This is a colon
+ #                          separated list containing:
+ #                          domain/user - User and authentication domain.
+ #                          namespace   - Name of the database being modified
+ #                          rid         - Resource keyword to modify.
+ #                          what        - new value associated with rid.
+ #
+ #    $client             - Socket open on the client.
+ #
+ #
+ #  Returns:
+ #      1 (keep on processing).
+ #  Side-Effects:
+ #    Writes to the client
+ sub store_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
+     if ($namespace ne 'roles') {
+ 	chomp($what);
+ 	my @pairs=split(/\&/,$what);
+ 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
+ 				       &GDBM_WRCREAT(), "S",
+ 				       "$rid:$what");
+ 	if ($hashref) {
+ 	    my $now = time;
+ 	    my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
+ 	    my $key;
+ 	    $hashref->{"version:$rid"}++;
+ 	    my $version=$hashref->{"version:$rid"};
+ 	    my $allkeys='';
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+ 		$allkeys.=$key.':';
+ 		$hashref->{"$version:$rid:$key"}=$value;
+ 	    }
+ 	    $hashref->{"$version:$rid:timestamp"}=$now;
+ 	    $allkeys.='timestamp';
+ 	    $hashref->{"$version:keys:$rid"}=$allkeys;
+ 	    if (untie($hashref)) {
+ 		&Reply($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);
+ #
+ #  Dump out all versions of a resource that has key=value pairs associated
+ # with it for each version.  These resources are built up via the store
+ # command.
+ #
+ #  Parameters:
+ #     $cmd               - Command keyword.
+ #     $tail              - Remainder of the request which consists of:
+ #                          domain/user   - User and auth. domain.
+ #                          namespace     - name of resource database.
+ #                          rid           - Resource id.
+ #    $client             - socket open on the client.
+ #
+ # Returns:
+ #      1  indicating the caller should not yet exit.
+ # Side-effects:
+ #   Writes a reply to the client.
+ #   The reply is a string of the following shape:
+ #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
+ #    Where the 1 above represents version 1.
+ #    this continues for all pairs of keys in all versions.
+ #
+ #
+ #
+ #
+ sub restore_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
+     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
+     $namespace=~s/\//\_/g;
+     $namespace=~s/\W//g;
+     chomp($rid);
+     my $proname=&propath($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)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply( $client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting restore\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting restore\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("restore", \&restore_handler, 0,1,0);
+ #
+ #   Add a chat message to to a 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    - Identifier of the discussion group.
+ #                          post    - Body of the posting.
+ #   $client              - Socket open on the client.
+ # Returns:
+ #   1    - Indicating caller should keep on processing.
+ #
+ # Side-effects:
+ #   writes a reply to the client.
+ #
+ #
+ sub send_chat_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
+     &chat_add($cdom,$cnum,$newpost);
+     &Reply($client, "ok\n", $userinput);
+     return 1;
+ }
+ &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
+ #
+ #   Retrieve the set of chat messagss 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.
+ #   $client           - Socket open on the client program.
+ # Returns:
+ #    1     - continue processing
+ # Side effects:
+ #    Response is written to the client.
+ #
+ sub retrieve_chat_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
+     my $reply='';
+     foreach (&get_chat($cdom,$cnum,$udom,$uname)) {
+ 	$reply.=&escape($_).':';
+     }
+     $reply=~s/\:$//;
+     &Reply($client, $reply."\n", $userinput);
+     return 1;
+ }
+ &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
+ #
+ #  Initiate a query of an sql database.  SQL query repsonses get put in
+ #  a file for later retrieval.  This prevents sql query results from
+ #  bottlenecking the system.  Note that with loncnew, perhaps this is
+ #  less of an issue since multiple outstanding requests can be concurrently
+ #  serviced.
+ #
+ #  Parameters:
+ #     $cmd       - COmmand keyword that initiated the request.
+ #     $tail      - Remainder of the command after the keyword.
+ #                  For this function, this consists of a query and
+ #                  3 arguments that are self-documentingly labelled
+ #                  in the original arg1, arg2, arg3.
+ #     $client    - Socket open on the client.
+ # Return:
+ #    1   - Indicating processing should continue.
+ # Side-effects:
+ #    a reply is written to $client.
+ #
+ sub send_query_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
+     $query=~s/\n*$//g;
+     &Reply($client, "". &sql_reply("$clientname\&$query".
+ 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
+ 	  $userinput);
+     return 1;
+ }
+ &register_handler("querysend", \&send_query_handler, 0, 1, 0);
+ #
+ #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
+ #   The query is submitted via a "querysend" transaction.
+ #   There it is passed on to the lonsql daemon, queued and issued to
+ #   mysql.
+ #     This transaction is invoked when the sql transaction is complete
+ #   it stores the query results in flie and indicates query completion.
+ #   presumably local software then fetches this response... I'm guessing
+ #   the sequence is: lonc does a querysend, we ask lonsql to do it.
+ #   lonsql on completion of the query interacts with the lond of our
+ #   client to do a query reply storing two files:
+ #    - id     - The results of the query.
+ #    - id.end - Indicating the transaction completed.
+ #    NOTE: id is a unique id assigned to the query and querysend time.
+ # Parameters:
+ #    $cmd        - Command keyword that initiated this request.
+ #    $tail       - Remainder of the tail.  In this case that's a colon
+ #                  separated list containing the query Id and the
+ #                  results of the query.
+ #    $client     - Socket open on the client.
+ # Return:
+ #    1           - Indicating that we should continue processing.
+ # Side effects:
+ #    ok written to the client.
+ #
+ sub reply_query_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cmd,$id,$reply)=split(/:/,$userinput);
+     my $store;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new(">$execdir/tmp/$id")) {
+ 	$reply=~s/\&/\n/g;
+ 	print $store $reply;
+ 	close $store;
+ 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
+ 	print $store2 "done\n";
+ 	close $store2;
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)
+ 		." IO::File->new Failed ".
+ 		"while attempting queryreply\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
+ #
+ #  Process the courseidput request.  Not quite sure what this means
+ #  at the system level sense.  It appears a gdbm file in the
+ #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
+ #  a set of entries made in that database.
+ #
+ # Parameters:
+ #   $cmd      - The command keyword that initiated this request.
+ #   $tail     - Tail of the command.  In this case consists of a colon
+ #               separated list contaning the domain to apply this to and
+ #               an ampersand separated list of keyword=value pairs.
+ #               Each value is a colon separated list that includes:
+ #               description, institutional code and course owner.
+ #               For backward compatibility with versions included
+ #               in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
+ #               code and/or course owner are preserved from the existing
+ #               record when writing a new record in response to 1.1 or
+ #               1.2 implementations of lonnet::flushcourselogs().
+ #
+ #   $client   - Socket open on the client.
+ # Returns:
+ #   1    - indicating that processing should continue
+ #
+ # Side effects:
+ #   reply is written to the client.
+ #
+ sub put_course_id_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom, $what) = split(/:/, $tail,2);
+     chomp($what);
+     my $now=time;
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+ 	foreach my $pair (@pairs) {
+             my ($key,$courseinfo) = split(/=/,$pair,2);
+             $courseinfo =~ s/=/:/g;
+             my @current_items = split(/:/,$hashref->{$key});
+             shift(@current_items); # remove description
+             pop(@current_items);   # remove last access
+             my $numcurrent = scalar(@current_items);
+             my @new_items = split(/:/,$courseinfo);
+             my $numnew = scalar(@new_items);
+             if ($numcurrent > 0) {
+                 if ($numnew == 1) { # flushcourselogs() from 1.1 or earlier
+                     $courseinfo .= ':'.join(':',@current_items);
+                 } elsif ($numnew == 2) { # flushcourselogs() from 1.2.X
+                     $courseinfo .= ':'.$current_items[$numcurrent-1];
+                 }
+             }
+ 	    $hashref->{$key}=$courseinfo.':'.$now;
+ 	}
+ 	if (untie(%$hashref)) {
+ 	    &Reply( $client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)
+ 		     ." untie(GDBM) Failed ".
+ 		     "while attempting courseidput\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)
+ 		 ." tie(GDBM) Failed ".
+ 		 "while attempting courseidput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
+ #  Retrieves the value of a course id resource keyword pattern
+ #  defined since a starting date.  Both the starting date and the
+ #  keyword pattern are optional.  If the starting date is not supplied it
+ #  is treated as the beginning of time.  If the pattern is not found,
+ #  it is treatred as "." matching everything.
+ #
+ #  Parameters:
+ #     $cmd     - Command keyword that resulted in us being dispatched.
+ #     $tail    - The remainder of the command that, in this case, consists
+ #                of a colon separated list of:
+ #                 domain   - The domain in which the course database is
+ #                            defined.
+ #                 since    - Optional parameter describing the minimum
+ #                            time of definition(?) of the resources that
+ #                            will match the dump.
+ #                 description - regular expression that is used to filter
+ #                            the dump.  Only keywords matching this regexp
+ #                            will be used.
+ #                 institutional code - optional supplied code to filter
+ #                            the dump. Only courses with an institutional code
+ #                            that match the supplied code will be returned.
+ #                 owner    - optional supplied username of owner to filter
+ #                            the dump.  Only courses for which the course
+ #                            owner matches the supplied username will be
+ #                            returned. Implicit assumption that owner
+ #                            is a user in the domain in which the
+ #                            course database is defined.
+ #     $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) =split(/:/,$tail);
+     if (defined($description)) {
+ 	$description=&unescape($description);
+     } else {
+ 	$description='.';
+     }
+     if (defined($instcodefilter)) {
+         $instcodefilter=&unescape($instcodefilter);
+     } else {
+         $instcodefilter='.';
+     }
+     if (defined($ownerfilter)) {
+         $ownerfilter=&unescape($ownerfilter);
+     } else {
+         $ownerfilter='.';
+     }
+     unless (defined($since)) { $since=0; }
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+ 	while (my ($key,$value) = each(%$hashref)) {
+ 	    my ($descr,$lasttime,$inst_code,$owner);
+             my @courseitems = split(/:/,$value);
+             $lasttime = pop(@courseitems);
+ 	    ($descr,$inst_code,$owner)=@courseitems;
+ 	    if ($lasttime<$since) { next; }
+             my $match = 1;
+ 	    unless ($description eq '.') {
+ 		my $unescapeDescr = &unescape($descr);
+ 		unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
+                     $match = 0;
+ 		}
+             }
+             unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
+                 my $unescapeInstcode = &unescape($inst_code);
+                 unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
+                     $match = 0;
+                 }
+ 	    }
+             unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
+                 my $unescapeOwner = &unescape($owner);
+                 unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
+                     $match = 0;
+                 }
+             }
+             if ($match == 1) {
+                 $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
+             }
+ 	}
+ 	if (untie(%$hashref)) {
+ 	    chop($qresult);
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting courseiddump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting courseiddump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
+ #
+ #  Puts an id to a domains id database.
+ #
+ #  Parameters:
+ #   $cmd     - The command that triggered us.
+ #   $tail    - Remainder of the request other than the command. This is a
+ #              colon separated list containing:
+ #              $domain  - The domain for which we are writing the id.
+ #              $pairs  - The id info to write... this is and & separated list
+ #                        of keyword=value.
+ #   $client  - Socket open on the client.
+ #  Returns:
+ #    1   - Continue processing.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub put_id_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
+ 				   "P", $what);
+     if ($hashref) {
+ 	foreach my $pair (@pairs) {
+ 	    my ($key,$value)=split(/=/,$pair);
+ 	    $hashref->{$key}=$value;
+ 	}
+ 	if (untie(%$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(%$hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		      "while attempting idget\n",$userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting idget\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("idget", \&get_id_handler, 0, 1, 0);
+ #
+ #  Process the tmpput command I'm not sure what this does.. Seems to
+ #  create a file in the lonDaemons/tmp directory of the form $id.tmp
+ # where Id is the client's ip concatenated with a sequence number.
+ # The file will contain some value that is passed in.  Is this e.g.
+ # a login token?
+ #
+ # Parameters:
+ #    $cmd     - The command that got us dispatched.
+ #    $tail    - The remainder of the request following $cmd:
+ #               In this case this will be the contents of the file.
+ #    $client  - Socket connected to the client.
+ # Returns:
+ #    1 indicating processing can continue.
+ # Side effects:
+ #   A file is created in the local filesystem.
+ #   A reply is sent to the client.
+ sub tmp_put_handler {
+     my ($cmd, $what, $client) = @_;
+     my $userinput = "$cmd:$what";	# Reconstruct for logging.
+     my $store;
+     $tmpsnum++;
+     my $id=$$.'_'.$clientip.'_'.$tmpsnum;
+     $id=~s/\W/\_/g;
+     $what=~s/\n//g;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
+ 	print $store $what;
+ 	close $store;
+ 	&Reply($client, "$id\n", $userinput);
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
+ 		  "while attempting tmpput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
+ #   Processes the tmpget command.  This command returns the contents
+ #  of a temporary resource file(?) created via tmpput.
+ #
+ # Paramters:
+ #    $cmd      - Command that got us dispatched.
+ #    $id       - Tail of the command, contain the id of the resource
+ #                we want to fetch.
+ #    $client   - socket open on the client.
+ # Return:
+ #    1         - Inidcating processing can continue.
+ # Side effects:
+ #   A reply is sent to the client.
+ #
+ sub tmp_get_handler {
+     my ($cmd, $id, $client) = @_;
+     my $userinput = "$cmd:$id";
+     $id=~s/\W/\_/g;
+     my $store;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
+ 	my $reply=<$store>;
+ 	&Reply( $client, "$reply\n", $userinput);
+ 	close $store;
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
+ 		  "while attempting tmpget\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
+ #
+ #  Process the tmpdel command.  This command deletes a temp resource
+ #  created by the tmpput command.
+ #
+ # Parameters:
+ #   $cmd      - Command that got us here.
+ #   $id       - Id of the temporary resource created.
+ #   $client   - socket open on the client process.
+ #
+ # Returns:
+ #   1     - Indicating processing should continue.
+ # Side Effects:
+ #   A file is deleted
+ #   A reply is sent to the client.
+ sub tmp_del_handler {
+     my ($cmd, $id, $client) = @_;
+     my $userinput= "$cmd:$id";
+     chomp($id);
+     $id=~s/\W/\_/g;
+     my $execdir=$perlvar{'lonDaemons'};
+     if (unlink("$execdir/tmp/$id.tmp")) {
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
+ 		  "while attempting tmpdel\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
+ #
+ #   Processes the setannounce command.  This command
+ #   creates a file named announce.txt in the top directory of
+ #   the documentn root and sets its contents.  The announce.txt file is
+ #   printed in its entirety at the LonCAPA login page.  Note:
+ #   once the announcement.txt fileis created it cannot be deleted.
+ #   However, setting the contents of the file to empty removes the
+ #   announcement from the login page of loncapa so who cares.
+ #
+ # Parameters:
+ #    $cmd          - The command that got us dispatched.
+ #    $announcement - The text of the announcement.
+ #    $client       - Socket open on the client process.
+ # Retunrns:
+ #   1             - Indicating request processing should continue
+ # Side Effects:
+ #   The file {DocRoot}/announcement.txt is created.
+ #   A reply is sent to $client.
+ #
+ sub set_announce_handler {
+     my ($cmd, $announcement, $client) = @_;
+     my $userinput    = "$cmd:$announcement";
+     chomp($announcement);
+     $announcement=&unescape($announcement);
+     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
+ 				'/announcement.txt')) {
+ 	print $store $announcement;
+ 	close $store;
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)."\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
+ #
+ #  Return the version of the daemon.  This can be used to determine
+ #  the compatibility of cross version installations or, alternatively to
+ #  simply know who's out of date and who isn't.  Note that the version
+ #  is returned concatenated with the tail.
+ # Parameters:
+ #   $cmd        - the request that dispatched to us.
+ #   $tail       - Tail of the request (client's version?).
+ #   $client     - Socket open on the client.
+ #Returns:
+ #   1 - continue processing requests.
+ # Side Effects:
+ #   Replies with version to $client.
+ sub get_version_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = $cmd.$tail;
+     &Reply($client, &version($userinput)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("version", \&get_version_handler, 0, 1, 0);
+ #  Set the current host and domain.  This is used to support
+ #  multihomed systems.  Each IP of the system, or even separate daemons
+ #  on the same IP can be treated as handling a separate lonCAPA virtual
+ #  machine.  This command selects the virtual lonCAPA.  The client always
+ #  knows the right one since it is lonc and it is selecting the domain/system
+ #  from the hosts.tab file.
+ # Parameters:
+ #    $cmd      - Command that dispatched us.
+ #    $tail     - Tail of the command (domain/host requested).
+ #    $socket   - Socket open on the client.
+ #
+ # Returns:
+ #     1   - Indicates the program should continue to process requests.
+ # Side-effects:
+ #     The default domain/system context is modified for this daemon.
+ #     a reply is sent to the client.
+ #
+ sub set_virtual_host_handler {
+     my ($cmd, $tail, $socket) = @_;
+     my $userinput  ="$cmd:$tail";
+     &Reply($client, &sethost($userinput)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
+ #  Process a request to exit:
+ #   - "bye" is sent to the client.
+ #   - The client socket is shutdown and closed.
+ #   - We indicate to the caller that we should exit.
+ # Formal Parameters:
+ #   $cmd                - The command that got us here.
+ #   $tail               - Tail of the command (empty).
+ #   $client             - Socket open on the tail.
+ # Returns:
+ #   0      - Indicating the program should exit!!
+ #
+ sub exit_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     &logthis("Client $clientip ($clientname) hanging up: $userinput");
+     &Reply($client, "bye\n", $userinput);
+     $client->shutdown(2);        # shutdown the socket forcibly.
+     $client->close();
+     return 0;
+ }
+ &register_handler("exit", \&exit_handler, 0,1,1);
+ &register_handler("init", \&exit_handler, 0,1,1);
+ &register_handler("quit", \&exit_handler, 0,1,1);
+ #  Determine if auto-enrollment is enabled.
+ #  Note that the original had what I believe to be a defect.
+ #  The original returned 0 if the requestor was not a registerd client.
+ #  It should return "refused".
+ # Formal Parameters:
+ #   $cmd       - The command that invoked us.
+ #   $tail      - The tail of the command (Extra command parameters.
+ #   $client    - The socket open on the client that issued the request.
+ # Returns:
+ #    1         - Indicating processing should continue.
+ #
+ sub enrollment_enabled_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = $cmd.":".$tail; # For logging purposes.
+     my $cdom = split(/:/, $tail);   # Domain we're asking about.
+     my $outcome  = &localenroll::run($cdom);
+     &Reply($client, "$outcome\n", $userinput);
+     return 1;
+ }
+ &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
+ #   Get the official sections for which auto-enrollment is possible.
+ #   Since the admin people won't know about 'unofficial sections'
+ #   we cannot auto-enroll on them.
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched here.
+ #    $tail    - The remainder of the request.  In our case this
+ #               will be split into:
+ #               $coursecode   - The course name from the admin point of view.
+ #               $cdom         - The course's domain(?).
+ #    $client  - Socket open on the client.
+ # Returns:
+ #    1    - Indiciting processing should continue.
+ #
+ sub get_sections_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($coursecode, $cdom) = split(/:/, $tail);
+     my @secs = &localenroll::get_sections($coursecode,$cdom);
+     my $seclist = &escape(join(':',@secs));
+     &Reply($client, "$seclist\n", $userinput);
+     return 1;
+ }
+ &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
+ #   Validate the owner of a new course section.
+ #
+ # Formal Parameters:
+ #   $cmd      - Command that got us dispatched.
+ #   $tail     - the remainder of the command.  For us this consists of a
+ #               colon separated string containing:
+ #                  $inst    - Course Id from the institutions point of view.
+ #                  $owner   - Proposed owner of the course.
+ #                  $cdom    - Domain of the course (from the institutions
+ #                             point of view?)..
+ #   $client   - Socket open on the client.
+ #
+ # Returns:
+ #   1        - Processing should continue.
+ #
+ sub validate_course_owner_handler {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
+     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
+     &Reply($client, "$outcome\n", $userinput);
+     return 1;
+ }
+ &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
+ #
+ #   Validate a course section in the official schedule of classes
+ #   from the institutions point of view (part of autoenrollment).
+ #
+ # Formal Parameters:
+ #   $cmd          - The command request that got us dispatched.
+ #   $tail         - The tail of the command.  In this case,
+ #                   this is a colon separated set of words that will be split
+ #                   into:
+ #                        $inst_course_id - The course/section id from the
+ #                                          institutions point of view.
+ #                        $cdom           - The domain from the institutions
+ #                                          point of view.
+ #   $client       - Socket open on the client.
+ # Returns:
+ #    1           - Indicating processing should continue.
+ #
+ sub validate_course_section_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_course_id, $cdom) = split(/:/, $tail);
+     my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
+     &Reply($client, "$outcome\n", $userinput);
+     return 1;
+ }
+ &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
+ #
+ #   Create a password for a new auto-enrollment user.
+ #   I think/guess, this password allows access to the institutions
+ #   AIS class list server/services.  Stuart can correct this comment
+ #   when he finds out how wrong I am.
+ #
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - The tail of the command.   In this case this is a colon separated
+ #               set of words that will be split into:
+ #               $authparam - An authentication parameter (username??).
+ #               $cdom      - The domain of the course from the institution's
+ #                            point of view.
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ #
+ sub create_auto_enroll_password_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($authparam, $cdom) = split(/:/, $userinput);
+     my ($create_passwd,$authchk);
+     ($authparam,
+      $create_passwd,
+      $authchk) = &localenroll::create_password($authparam,$cdom);
+     &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
+ 	   $userinput);
+     return 1;
+ }
+ &register_handler("autocreatepassword", \&create_auto_enroll_password_handler,
+, 1, 0);
+ #   Retrieve and remove temporary files created by/during autoenrollment.
+ #
+ # Formal Parameters:
+ #    $cmd      - The command that got us dispatched.
+ #    $tail     - The tail of the command.  In our case this is a colon
+ #                separated list that will be split into:
+ #                $filename - The name of the file to remove.
+ #                            The filename is given as a path relative to
+ #                            the LonCAPA temp file directory.
+ #    $client   - Socket open on the client.
+ #
+ # Returns:
+ #   1     - Continue processing.
+ sub retrieve_auto_file_handler {
+     my ($cmd, $tail, $client)    = @_;
+     my $userinput                = "cmd:$tail";
+     my ($filename)   = split(/:/, $tail);
+     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
+     if ( (-e $source) && ($filename ne '') ) {
+ 	my $reply = '';
+ 	if (open(my $fh,$source)) {
+ 	    while (<$fh>) {
+ 		chomp($_);
+ 		$_ =~ s/^\s+//g;
+ 		$_ =~ s/\s+$//g;
+ 		$reply .= $_;
+ 	    }
+ 	    close($fh);
+ 	    &Reply($client, &escape($reply)."\n", $userinput);
+ #   Does this have to be uncommented??!?  (RF).
+ #
+ #                                unlink($source);
+ 	} else {
+ 	    &Failure($client, "error\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
+ #
+ #   Read and retrieve institutional code format (for support form).
+ # Formal Parameters:
+ #    $cmd        - Command that dispatched us.
+ #    $tail       - Tail of the command.  In this case it conatins
+ #                  the course domain and the coursename.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #    1     - Continue processing.
+ #
+ sub get_institutional_code_format_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $reply;
+     my($cdom,$course) = split(/:/,$tail);
+     my @pairs = split/\&/,$course;
+     my %instcodes = ();
+     my %codes = ();
+     my @codetitles = ();
+     my %cat_titles = ();
+     my %cat_order = ();
+     foreach (@pairs) {
+ 	my ($key,$value) = split/=/,$_;
+ 	$instcodes{&unescape($key)} = &unescape($value);
+     }
+     my $formatreply = &localenroll::instcode_format($cdom,
+ 						    \%instcodes,
+ 						    \%codes,
+ 						    \@codetitles,
+ 						    \%cat_titles,
+ 						    \%cat_order);
+     if ($formatreply eq 'ok') {
+ 	my $codes_str = &hash2str(%codes);
+ 	my $codetitles_str = &array2str(@codetitles);
+ 	my $cat_titles_str = &hash2str(%cat_titles);
+ 	my $cat_order_str = &hash2str(%cat_order);
+ 	&Reply($client,
+ 	       $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
+ 	       .$cat_order_str."\n",
+ 	       $userinput);
+     } else {
+ 	# this else branch added by RF since if not ok, lonc will
+ 	# hang waiting on reply until timeout.
+ 	#
+ 	&Reply($client, "format_error\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("autoinstcodeformat",
+ 		  \&get_institutional_code_format_handler,0,1,0);
+ #
+ # 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,$type) = split(/:/, $tail);
+     my $path=&propath($domain,$uname).
+ 	'/userfiles/internal/studentphoto.'.$type;
+     if (-e $path) {
+ 	&Reply($client,"ok\n","$cmd:$tail");
+ 	return 1;
+     }
+     &mkpath($path);
+     my $file=&localstudentphoto::fetch($domain,$uname);
+     if (!$file) {
+ 	&Failure($client,"unavailable\n","$cmd:$tail");
+ 	return 1;
+     }
+     if (!-e $path) { &convert_photo($file,$path); }
+     if (-e $path) {
+ 	&Reply($client,"ok\n","$cmd:$tail");
+ 	return 1;
+     }
+     &Failure($client,"unable_to_convert\n","$cmd:$tail");
+     return 1;
+ }
+ &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
+ # mkpath makes all directories for a file, expects an absolute path with a
+ # file or a trailing / if just a dir is passed
+ # returns 1 on success 0 on failure
+ sub mkpath {
+     my ($file)=@_;
+     my @parts=split(/\//,$file,-1);
+     my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
+     for (my $i=3;$i<= ($#parts-1);$i++) {
+ 	$now.='/'.$parts[$i];
+ 	if (!-e $now) {
+ 	    if  (!mkdir($now,0770)) { return 0; }
+ 	}
+     }
+     return 1;
+ }
  #---------------------------------------------------------------
  #
  #   Getting, decoding and dispatching requests:
  #
  #
  #   Get a Request:
  #   Gets a Request message from the client.  The transaction
- Line 1887  sub get_request {
+ Line 3921  sub get_request {
      my $input = <$client>;
      chomp($input);
-     Debug("get_request: Request = $input\n");
+     &Debug("get_request: Request = $input\n");
      &status('Processing '.$clientname.':'.$input);
- Line 1913  sub process_request {
+ Line 3947  sub process_request {
  	$userinput = decipher($userinput);
  	$wasenc=1;
  	if(!$userinput) {	# Cipher not defined.
- 	    &Failure($client, "error: Encrypted data without negotated key");
+ 	    &Failure($client, "error: Encrypted data without negotated key\n");
  	    return 0;
  	}
      }
- Line 1983  sub process_request {
+ Line 4017  sub process_request {
      }
- #------------------- Commands not yet in spearate handlers. --------------
+     print $client "unknown_cmd\n";
- # ----------------------------------------------------------------- unsubscribe
-     if ($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,
- 					   &get_auth_type( $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.
- 	$client->close();
- 	return 0;
- # ---------------------------------- set current host/domain
-     } elsif ($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
      Debug("process_request - returning 1");
      return 1;
- Line 3308  sub ReadHostTable {
+ Line 4279  sub ReadHostTable {
      my $myloncapaname = $perlvar{'lonHostID'};
      Debug("My loncapa name is : $myloncapaname");
      while (my $configline=<CONFIG>) {
- 	if (!($configline =~ /^\s*\#/)) {
+ 	if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
- 	    my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
+ 	    my ($id,$domain,$role,$name)=split(/:/,$configline);
- 	    chomp($ip); $ip=~s/\D+$//;
+ 	    $name=~s/\s//g;
+ 	    my (undef,undef,undef,undef,$ip) = gethostbyname($name);
+ 	    if (length($ip) ne 4) {
+ 		&logthis("Skipping host $id name $name no IP $ip found\n");
+ 		next;
+ 	    }
+ 	    $ip=inet_ntoa($ip);
  	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
  	    $hostdom{$id}=$domain;    # LonCAPA domain name of host.
- 	    $hostip{$id}=$ip;	      # IP address of host.
+ 	    $hostip{$id}=$ip;         # IP address of host.
  	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
  	    if ($id eq $perlvar{'lonHostID'}) {
- Line 3494  sub logstatus {
+ Line 4471  sub logstatus {
  	flock(LOG,LOCK_EX);
  	print LOG $$."\t".$clientname."\t".$currenthostid."\t"
  	    .$status."\t".$lastlog."\t $keymode\n";
- 	flock(DB,LOCK_UN);
+ 	flock(LOG,LOCK_UN);
  	close(LOG);
      }
      &status("Finished logging");
- Line 3598  sub reply {
+ Line 4575  sub reply {
  # -------------------------------------------------------------- Talk to lonsql
- sub sqlreply {
+ sub sql_reply {
      my ($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 $answer;
  }
- sub subsqlreply {
+ sub sub_sql_reply {
      my ($cmd)=@_;
      my $unixsock="mysqlsock";
      my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
- Line 3725  sub make_new_child {
+ Line 4702  sub make_new_child {
      if (defined($iaddr)) {
  	$clientip  = inet_ntoa($iaddr);
  	Debug("Connected with $clientip");
- 	$clientdns = gethostbyaddr($iaddr, AF_INET);
- 	Debug("Connected with $clientdns by name");
      } else {
  	&logthis("Unable to determine clientip");
  	$clientip='Unavailable';
- Line 3921  sub make_new_child {
+ Line 4896  sub make_new_child {
      exit;
  }
+ #
+ #   Determine if a user is an author for the indicated domain.
+ #
+ # Parameters:
+ #    domain          - domain to check in .
+ #    user            - Name of user to check.
+ #
+ # Return:
+ #     1             - User is an author for domain.
+ #     0             - User is not an author for domain.
+ sub is_author {
+     my ($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 = $hashref->{$key};
+     if(defined($value)) {
+ 	&Debug("$user @ $domain is an author");
+     }
+     return defined($value);
+ }
  #
  #   Checks to see if the input roleput request was to set
  # an author role.  If so, invokes the lchtmldir script to set
- Line 3934  sub make_new_child {
+ Line 4936  sub make_new_child {
  #    user      - Name of the user for which the role is being put.
  #    authtype  - The authentication type associated with the user.
  #
- sub ManagePermissions
+ sub manage_permissions
  {
      my ($request, $domain, $user, $authtype) = @_;
+     &Debug("manage_permissions: $request $domain $user $authtype");
      # See if the request is of the form /$domain/_au
      if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
  	my $execdir = $perlvar{'lonDaemons'};
  	my $userhome= "/home/$user" ;
  	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
+ 	&Debug("Setting homedir permissions for $userhome");
  	system("$execdir/lchtmldir $userhome $user $authtype");
      }
  }
- Line 3959  sub ManagePermissions
+ Line 4965  sub ManagePermissions
  #
  sub password_path {
      my ($domain, $user) = @_;
+     return &propath($domain, $user).'/passwd';
-     my $path   = &propath($domain, $user);
-     $path  .= "/passwd";
-     return $path;
  }
  #   Password Filename
- Line 4039  sub get_auth_type
+ Line 5040  sub get_auth_type
  	Debug("Password info = $realpassword\n");
  	my ($authtype, $contentpwd) = split(/:/, $realpassword);
  	Debug("Authtype = $authtype, content = $contentpwd\n");
- 	my $availinfo = '';
+ 	return "$authtype:$contentpwd";
- 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
- 	    $availinfo = $contentpwd;
- 	}
- 	return "$authtype:$availinfo";
      } else {
  	Debug("Returning nouser");
  	return "nouser";
- Line 4077  sub validate_user {
+ Line 5073  sub validate_user {
      # 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.
+     # 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;
- Line 4141  sub validate_user {
+ Line 5138  sub validate_user {
  		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,
+ 		my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
  									 $krbserver,
  									 $password,
  									 $credentials);
- Line 4165  sub validate_user {
+ Line 5162  sub validate_user {
      #
      unless ($validated != -3.14159) {
- 	die "ValidateUser - failed to set the value of validated";
+ 	#  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;
  }
- Line 4191  sub addline {
+ Line 5192  sub addline {
      return $found;
  }
- sub getchat {
+ sub get_chat {
      my ($cdom,$cname,$udom,$uname)=@_;
      my %hash;
      my $proname=&propath($cdom,$cname);
- Line 4216  sub getchat {
+ Line 5217  sub getchat {
      return (@participants,@entries);
  }
- sub chatadd {
+ sub chat_add {
      my ($cdom,$cname,$newchat)=@_;
      my %hash;
      my $proname=&propath($cdom,$cname);
- Line 4388  sub make_passwd_file {
+ Line 5389  sub make_passwd_file {
      if ($umode eq 'krb4' or $umode eq 'krb5') {
  	{
  	    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') {
  	my $salt=time;
- Line 4397  sub make_passwd_file {
+ Line 5402  sub make_passwd_file {
  	{
  	    &Debug("Creating internal auth");
  	    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') {
  	{
  	    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') {
  	{
- Line 4441  sub make_passwd_file {
+ Line 5454  sub make_passwd_file {
  		$result = "lcuseradd_failed:$error_text\n";
  	    }  else {
  		my $pf = IO::File->new(">$passfilename");
- 		print $pf "unix:\n";
+ 		if($pf) {
+ 		    print $pf "unix:\n";
+ 		} else {
+ 		    $result = "pass_file_failed_error";
+ 		}
  	    }
  	}
      } elsif ($umode eq 'none') {
  	{
  	    my $pf = IO::File->new("> $passfilename");
- 	    print $pf "none:\n";
+ 	    if($pf) {
+ 		print $pf "none:\n";
+ 	    } else {
+ 		$result = "pass_file_failed_error";
+ 	    }
  	}
      } else {
  	$result="auth_mode_error\n";
- Line 4455  sub make_passwd_file {
+ Line 5476  sub make_passwd_file {
      return $result;
  }
+ sub convert_photo {
+     my ($start,$dest)=@_;
+     system("convert $start $dest");
+ }
  sub sethost {
      my ($remotereq) = @_;
      my (undef,$hostid)=split(/:/,$remotereq);
- Line 4775  Place in B<logs/lond.log>
+ Line 5801  Place in B<logs/lond.log>
  stores hash in namespace
- =item rolesput
+ =item rolesputy
  put a role into a user's environment

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>

Removed from v.1.228
changed lines
	Added in v.1.277