loncom/lond - diff

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Diff for /loncom/lond between versions 1.186 and 1.370

-version 1.186, 2004/04/07 10:02:11
+version 1.370, 2007/04/04 00:03:40
  Line 31
  use strict;
  use lib '/home/httpd/lib/perl/';
+ use LONCAPA;
  use LONCAPA::Configuration;
+ use Apache::lonnet;
  use IO::Socket;
  use IO::File;
  #use Apache::File;
- use Symbol;
  use POSIX;
  use Crypt::IDEA;
  use LWP::UserAgent();
+ use Digest::MD5 qw(md5_hex);
  use GDBM_File;
  use Authen::Krb4;
  use Authen::Krb5;
- use lib '/home/httpd/lib/perl/';
  use localauth;
+ use localenroll;
+ use localstudentphoto;
  use File::Copy;
- use LONCAPA::ConfigFileEdit;
+ use File::Find;
+ use LONCAPA::lonlocal;
+ use LONCAPA::lonssl;
+ use Fcntl qw(:flock);
  my $DEBUG = 0;		       # Non zero to enable debug log entries.
- Line 55  my $lastlog='';
+ Line 61  my $lastlog='';
  my $VERSION='$Revision$'; #' stupid emacs
  my $remoteVERSION;
- my $currenthostid;
+ my $currenthostid="default";
  my $currentdomainid;
  my $client;
- my $clientip;
+ my $clientip;			# IP address of client.
- my $clientname;
+ my $clientname;			# LonCAPA name of client.
  my $server;
- my $thisserver;
+ my $thisserver;			# DNS of us.
+ my $keymode;
+ my $cipher;			# Cipher key negotiated with client
+ my $tmpsnum = 0;		# Id of tmpputs.
  #
  #   Connection type is:
- Line 74  my $thisserver;
+ Line 85  my $thisserver;
  my $ConnectionType;
- my %hostid;
- my %hostdom;
- my %hostip;
  my %managers;			# Ip -> manager names
  my %perlvar;			# Will have the apache conf defined perl vars.
  #
+ #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
+ #    Each element of the hash contains a reference to an array that contains:
+ #          A reference to a sub that executes the request corresponding to the keyword.
+ #          A flag that is true if the request must be encoded to be acceptable.
+ #          A mask with bits as follows:
+ #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
+ #                      MANAGER_OK   - Set when the function is allowed to manager clients.
+ #
+ my $CLIENT_OK  = 1;
+ my $MANAGER_OK = 2;
+ my %Dispatcher;
+ #
  #  The array below are password error strings."
  #
  my $lastpwderror    = 13;		# Largest error number from lcpasswd.
  my @passwderrors = ("ok",
- 		   "lcpasswd must be run as user 'www'",
+ 		   "pwchange_failure - lcpasswd must be run as user 'www'",
- 		   "lcpasswd got incorrect number of arguments",
+ 		   "pwchange_failure - lcpasswd got incorrect number of arguments",
- 		   "lcpasswd did not get the right nubmer of input text lines",
+ 		   "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
- 		   "lcpasswd too many simultaneous pwd changes in progress",
+ 		   "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
- 		   "lcpasswd User does not exist.",
+ 		   "pwchange_failure - lcpasswd User does not exist.",
- 		   "lcpasswd Incorrect current passwd",
+ 		   "pwchange_failure - lcpasswd Incorrect current passwd",
- 		   "lcpasswd Unable to su to root.",
+ 		   "pwchange_failure - lcpasswd Unable to su to root.",
- 		   "lcpasswd Cannot set new passwd.",
+ 		   "pwchange_failure - lcpasswd Cannot set new passwd.",
- 		   "lcpasswd Username has invalid characters",
+ 		   "pwchange_failure - lcpasswd Username has invalid characters",
- 		   "lcpasswd Invalid characters in password",
+ 		   "pwchange_failure - lcpasswd Invalid characters in password",
- 		    "11", "12",
+ 		   "pwchange_failure - lcpasswd User already exists",
- 		    "lcpasswd Password mismatch");
+                    "pwchange_failure - lcpasswd Something went wrong with user addition.",
+ 		   "pwchange_failure - lcpasswd Password mismatch",
+ 		   "pwchange_failure - lcpasswd Error filename is invalid");
  #  The array below are lcuseradd error strings.:
- Line 120  my @adderrors    = ("ok",
+ Line 143  my @adderrors    = ("ok",
  		    "lcuseradd Password mismatch");
+ #
+ #   Statistics that are maintained and dislayed in the status line.
+ #
+ my $Transactions = 0;		# Number of attempted transactions.
+ my $Failures     = 0;		# Number of transcations failed.
+ #   ResetStatistics:
+ #      Resets the statistics counters:
+ #
+ sub ResetStatistics {
+     $Transactions = 0;
+     $Failures     = 0;
+ }
+ #------------------------------------------------------------------------
+ #
+ #   LocalConnection
+ #     Completes the formation of a locally authenticated connection.
+ #     This function will ensure that the 'remote' client is really the
+ #     local host.  If not, the connection is closed, and the function fails.
+ #     If so, initcmd is parsed for the name of a file containing the
+ #     IDEA session key.  The fie is opened, read, deleted and the session
+ #     key returned to the caller.
+ #
+ # Parameters:
+ #   $Socket      - Socket open on client.
+ #   $initcmd     - The full text of the init command.
+ #
+ # Implicit inputs:
+ #    $thisserver - Our DNS name.
+ #
+ # Returns:
+ #     IDEA session key on success.
+ #     undef on failure.
+ #
+ sub LocalConnection {
+     my ($Socket, $initcmd) = @_;
+     Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
+     if($clientip ne "127.0.0.1") {
+ 	&logthis('<font color="red"> LocalConnection rejecting non local: '
+ 		 ."$clientip ne $thisserver </font>");
+ 	close $Socket;
+ 	return undef;
+     }  else {
+ 	chomp($initcmd);	# Get rid of \n in filename.
+ 	my ($init, $type, $name) = split(/:/, $initcmd);
+ 	Debug(" Init command: $init $type $name ");
+ 	# Require that $init = init, and $type = local:  Otherwise
+ 	# the caller is insane:
+ 	if(($init ne "init") && ($type ne "local")) {
+ 	    &logthis('<font color = "red"> LocalConnection: caller is insane! '
+ 		     ."init = $init, and type = $type </font>");
+ 	    close($Socket);;
+ 	    return undef;
+ 	}
+ 	#  Now get the key filename:
+ 	my $IDEAKey = lonlocal::ReadKeyFile($name);
+ 	return $IDEAKey;
+     }
+ }
+ #------------------------------------------------------------------------------
+ #
+ #  SSLConnection
+ #   Completes the formation of an ssh authenticated connection. The
+ #   socket is promoted to an ssl socket.  If this promotion and the associated
+ #   certificate exchange are successful, the IDEA key is generated and sent
+ #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
+ #   the caller after the SSL tunnel is torn down.
+ #
+ # Parameters:
+ #   Name              Type             Purpose
+ #   $Socket          IO::Socket::INET  Plaintext socket.
+ #
+ # Returns:
+ #    IDEA key on success.
+ #    undef on failure.
+ #
+ sub SSLConnection {
+     my $Socket   = shift;
+     Debug("SSLConnection: ");
+     my $KeyFile         = lonssl::KeyFile();
+     if(!$KeyFile) {
+ 	my $err = lonssl::LastError();
+ 	&logthis("<font color=\"red\"> CRITICAL"
+ 		 ."Can't get key file $err </font>");
+ 	return undef;
+     }
+     my ($CACertificate,
+ 	$Certificate) = lonssl::CertificateFile();
+     # If any of the key, certificate or certificate authority
+     # certificate filenames are not defined, this can't work.
+     if((!$Certificate) || (!$CACertificate)) {
+ 	my $err = lonssl::LastError();
+ 	&logthis("<font color=\"red\"> CRITICAL"
+ 		 ."Can't get certificates: $err </font>");
+ 	return undef;
+     }
+     Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
+     # Indicate to our peer that we can procede with
+     # a transition to ssl authentication:
+     print $Socket "ok:ssl\n";
+     Debug("Approving promotion -> ssl");
+     #  And do so:
+     my $SSLSocket = lonssl::PromoteServerSocket($Socket,
+ 						$CACertificate,
+ 						$Certificate,
+ 						$KeyFile);
+     if(! ($SSLSocket) ) {	# SSL socket promotion failed.
+ 	my $err = lonssl::LastError();
+ 	&logthis("<font color=\"red\"> CRITICAL "
+ 		 ."SSL Socket promotion failed: $err </font>");
+ 	return undef;
+     }
+     Debug("SSL Promotion successful");
+     #
+     #  The only thing we'll use the socket for is to send the IDEA key
+     #  to the peer:
+     my $Key = lonlocal::CreateCipherKey();
+     print $SSLSocket "$Key\n";
+     lonssl::Close($SSLSocket);
+     Debug("Key exchange complete: $Key");
+     return $Key;
+ }
+ #
+ #     InsecureConnection:
+ #        If insecure connections are allowd,
+ #        exchange a challenge with the client to 'validate' the
+ #        client (not really, but that's the protocol):
+ #        We produce a challenge string that's sent to the client.
+ #        The client must then echo the challenge verbatim to us.
+ #
+ #  Parameter:
+ #      Socket      - Socket open on the client.
+ #  Returns:
+ #      1           - success.
+ #      0           - failure (e.g.mismatch or insecure not allowed).
+ #
+ sub InsecureConnection {
+     my $Socket  =  shift;
+     #   Don't even start if insecure connections are not allowed.
+     if(! $perlvar{londAllowInsecure}) {	# Insecure connections not allowed.
+ 	return 0;
+     }
+     #   Fabricate a challenge string and send it..
+     my $challenge = "$$".time;	# pid + time.
+     print $Socket "$challenge\n";
+     &status("Waiting for challenge reply");
+     my $answer = <$Socket>;
+     $answer    =~s/\W//g;
+     if($challenge eq $answer) {
+ 	return 1;
+     } else {
+ 	logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
+ 	&status("No challenge reqply");
+ 	return 0;
+     }
+ }
  #
+ #   Safely execute a command (as long as it's not a shel command and doesn
+ #   not require/rely on shell escapes.   The function operates by doing a
+ #   a pipe based fork and capturing stdout and stderr  from the pipe.
+ #
+ # Formal Parameters:
+ #     $line                    - A line of text to be executed as a command.
+ # Returns:
+ #     The output from that command.  If the output is multiline the caller
+ #     must know how to split up the output.
+ #
+ #
+ sub execute_command {
+     my ($line)    = @_;
+     my @words     = split(/\s/, $line);	# Bust the command up into words.
+     my $output    = "";
+     my $pid = open(CHILD, "-|");
+     if($pid) {			# Parent process
+ 	Debug("In parent process for execute_command");
+ 	my @data = <CHILD>;	# Read the child's outupt...
+ 	close CHILD;
+ 	foreach my $output_line (@data) {
+ 	    Debug("Adding $output_line");
+ 	    $output .= $output_line; # Presumably has a \n on it.
+ 	}
+     } else {			# Child process
+ 	close (STDERR);
+ 	open  (STDERR, ">&STDOUT");# Combine stderr, and stdout...
+ 	exec(@words);		# won't return.
+     }
+     return $output;
+ }
  #   GetCertificate: Given a transaction that requires a certificate,
  #   this function will extract the certificate from the transaction
  #   request.  Note that at this point, the only concept of a certificate
- Line 158  sub isClient {
+ Line 400  sub isClient {
  #                     - This allows dynamic changes to the manager table
  #                       without the need to signal to the lond.
  #
  sub ReadManagerTable {
      #   Clean out the old table first..
- Line 175  sub ReadManagerTable {
+ Line 416  sub ReadManagerTable {
     while(my $host = <MANAGERS>) {
        chomp($host);
        if ($host =~ "^#") {                  # Comment line.
-          logthis('<font color="green"> Skipping line: '. "$host</font>\n");
           next;
        }
-       if (!defined $hostip{$host}) { # This is a non cluster member
+       if (!defined &Apache::lonnet::get_host_ip($host)) { # This is a non cluster member
  	    #  The entry is of the form:
  	    #    cluname:hostname
  	    #  cluname - A 'cluster hostname' is needed in order to negotiate
- Line 196  sub ReadManagerTable {
+ Line 436  sub ReadManagerTable {
           }
        } else {
           logthis('<font color="green"> existing host'." $host</font>\n");
-          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
+          $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
        }
     }
  }
- Line 225  sub ValidManager {
+ Line 465  sub ValidManager {
  #     1   - Success.
  #
  sub CopyFile {
-     my $oldfile = shift;
-     my $newfile = shift;
-     #  The file must exist:
-     if(-e $oldfile) {
- 	 # Read the old file.
- 	my $oldfh = IO::File->new("< $oldfile");
- 	if(!$oldfh) {
- 	    return 0;
- 	}
- 	my @contents = <$oldfh>;  # Suck in the entire file.
- 	# write the backup file:
- 	my $newfh = IO::File->new("> $newfile");
- 	if(!(defined $newfh)){
- 	    return 0;
- 	}
- 	my $lines = scalar @contents;
- 	for (my $i =0; $i < $lines; $i++) {
- 	    print $newfh ($contents[$i]);
- 	}
- 	$oldfh->close;
- 	$newfh->close;
- 	chmod(0660, $newfile);
+     my ($oldfile, $newfile) = @_;
- 	return 1;
+     if (! copy($oldfile,$newfile)) {
+         return 0;
-     } else {
- 	return 0;
      }
+     chmod(0660, $newfile);
+     return 1;
  }
  #
  #  Host files are passed out with externally visible host IPs.
- Line 285  sub AdjustHostContents {
+ Line 497  sub AdjustHostContents {
      my $adjusted;
      my $me        = $perlvar{'lonHostID'};
-  foreach my $line (split(/\n/,$contents)) {
+     foreach my $line (split(/\n/,$contents)) {
  	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
  	    chomp($line);
  	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
  	    if ($id eq $me) {
-           my $ip = gethostbyname($name);
+ 		my $ip = gethostbyname($name);
-           my $ipnew = inet_ntoa($ip);
+ 		my $ipnew = inet_ntoa($ip);
-          $ip = $ipnew;
+ 		$ip = $ipnew;
  		#  Reconstruct the host line and append to adjusted:
- 		   my $newline = "$id:$domain:$role:$name:$ip";
+ 		my $newline = "$id:$domain:$role:$name:$ip";
- 		   if($maxcon ne "") { # Not all hosts have loncnew tuning params
+ 		if($maxcon ne "") { # Not all hosts have loncnew tuning params
- 		     $newline .= ":$maxcon:$idleto:$mincon";
+ 		    $newline .= ":$maxcon:$idleto:$mincon";
- 		   }
+ 		}
- 		   $adjusted .= $newline."\n";
+ 		$adjusted .= $newline."\n";
-       } else {		# Not me, pass unmodified.
+ 	    } else {		# Not me, pass unmodified.
- 		   $adjusted .= $line."\n";
+ 		$adjusted .= $line."\n";
-       }
+ 	    }
  	} else {                  # Blank or comment never re-written.
  	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
  	}
-  }
+     }
-  return $adjusted;
+     return $adjusted;
  }
  #
  #   InstallFile: Called to install an administrative file:
- Line 326  sub AdjustHostContents {
+ Line 538  sub AdjustHostContents {
  #      0       - failure and $! has an errno.
  #
  sub InstallFile {
-     my $Filename = shift;
-     my $Contents = shift;
+     my ($Filename, $Contents) = @_;
      my $TempFile = $Filename.".tmp";
      #  Open the file for write:
- Line 350  sub InstallFile {
+ Line 562  sub InstallFile {
      return 1;
  }
  #
  #   ConfigFileFromSelector: converts a configuration file selector
  #                 (one of host or domain at this point) into a
- Line 439  sub PushFile {
+ Line 653  sub PushFile {
  	&logthis('<font color="red"> Pushfile: unable to install '
  	 .$tablefile." $! </font>");
  	return "error:$!";
-     }
+     } else {
-     else {
  	&logthis('<font color="green"> Installed new '.$tablefile
  		 ."</font>");
- Line 564  sub isValidEditCommand {
+ Line 777  sub isValidEditCommand {
  #                  file being edited.
  #
  sub ApplyEdit {
-     my $directive   = shift;
-     my $editor      = shift;
+     my ($directive, $editor) = @_;
      # Break the directive down into its command and its parameters
      # (at most two at this point.  The meaning of the parameters, if in fact
- Line 616  sub AdjustOurHost {
+ Line 829  sub AdjustOurHost {
      #   Use the config line to get my hostname.
      #   Use gethostbyname to translate that into an IP address.
      #
-     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
+     my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
-     my $BinaryIp = gethostbyname($name);
-     my $ip       = inet_ntoa($ip);
      #
      #  Reassemble the config line from the elements in the list.
      #  Note that if the loncnew items were not present before, they will
      #  be now even if they would be empty
      #
      my $newConfigLine = $id;
-     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
+     foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) {
  	$newConfigLine .= ":".$item;
      }
      #  Replace the line:
- Line 649  sub AdjustOurHost {
+ Line 860  sub AdjustOurHost {
  #        editor     - Editor containing the file.
  #
  sub ReplaceConfigFile {
-     my $filename  = shift;
-     my $editor    = shift;
+     my ($filename, $editor) = @_;
      CopyFile ($filename, $filename.".old");
- Line 671  sub EditFile {
+ Line 882  sub EditFile {
      #  Split the command into it's pieces:  edit:filetype:script
-     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
+     my ($cmd, $filetype, $script) = split(/:/, $request,3);	# : in script
      #  Check the pre-coditions for success:
-     if($request != "edit") {	# Something is amiss afoot alack.
+     if($cmd != "edit") {	# Something is amiss afoot alack.
  	return "error:edit request detected, but request != 'edit'\n";
      }
      if( ($filetype ne "hosts")  &&
- Line 719  sub EditFile {
+ Line 930  sub EditFile {
      return "ok\n";
  }
+ #   read_profile
+ #
+ #   Returns a set of specific entries from a user's profile file.
+ #   this is a utility function that is used by both get_profile_entry and
+ #   get_profile_entry_encrypted.
+ #
+ # Parameters:
+ #    udom       - Domain in which the user exists.
+ #    uname      - User's account name (loncapa account)
+ #    namespace  - The profile namespace to open.
+ #    what       - A set of & separated queries.
+ # Returns:
+ #    If all ok: - The string that needs to be shipped back to the user.
+ #    If failure - A string that starts with error: followed by the failure
+ #                 reason.. note that this probabyl gets shipped back to the
+ #                 user as well.
+ #
+ sub read_profile {
+     my ($udom, $uname, $namespace, $what) = @_;
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+         my @queries=split(/\&/,$what);
+         my $qresult='';
+ 	for (my $i=0;$i<=$#queries;$i++) {
+ 	    $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
+ 	}
+ 	$qresult=~s/\&$//;              # Remove trailing & from last lookup.
+ 	if (&untie_user_hash($hashref)) {
+ 	    return $qresult;
+ 	} else {
+ 	    return "error: ".($!+0)." untie (GDBM) Failed";
+ 	}
+     } else {
+ 	if ($!+0 == 2) {
+ 	    return "error:No such file or GDBM reported bad block error";
+ 	} else {
+ 	    return "error: ".($!+0)." tie (GDBM) Failed";
+ 	}
+     }
+ }
+ #--------------------- Request Handlers --------------------------------------------
+ #
+ #   By convention each request handler registers itself prior to the sub
+ #   declaration:
+ #
+ #++
+ #
+ #  Handles ping requests.
+ #  Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host we are
+ #                       known as.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub ping_handler {
+     my ($cmd, $tail, $client) = @_;
+     Debug("$cmd $tail $client .. $currenthostid:");
+     Reply( $client,"$currenthostid\n","$cmd:$tail");
+     return 1;
+ }
+ &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
+ #++
+ #
+ # Handles pong requests.  Pong replies with our current host id, and
+ #                         the results of a ping sent to us via our lonc.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host we are
+ #                       connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub pong_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $reply=&Apache::lonnet::reply("ping",$clientname);
+     &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
+ #++
+ #      Called to establish an encrypted session key with the remote client.
+ #      Note that with secure lond, in most cases this function is never
+ #      invoked.  Instead, the secure session key is established either
+ #      via a local file that's locked down tight and only lives for a short
+ #      time, or via an ssl tunnel...and is generated from a bunch-o-random
+ #      bits from /dev/urandom, rather than the predictable pattern used by
+ #      by this sub.  This sub is only used in the old-style insecure
+ #      key negotiation.
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the hsot we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Implicit Outputs:
+ #      Reply information is sent to the client.
+ #      $cipher is set with a reference to a new IDEA encryption object.
+ #
+ sub establish_key_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $buildkey=time.$$.int(rand 100000);
+     $buildkey=~tr/1-6/A-F/;
+     $buildkey=int(rand 100000).$buildkey.int(rand 100000);
+     my $key=$currenthostid.$clientname;
+     $key=~tr/a-z/A-Z/;
+     $key=~tr/G-P/0-9/;
+     $key=~tr/Q-Z/0-9/;
+     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
+     $key=substr($key,0,32);
+     my $cipherkey=pack("H32",$key);
+     $cipher=new IDEA $cipherkey;
+     &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("ekey", \&establish_key_handler, 0, 1,1);
+ #     Handler for the load command.  Returns the current system load average
+ #     to the requestor.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the hsot we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub load_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+    # Get the load average from /proc/loadavg and calculate it as a percentage of
+    # the allowed load limit as set by the perl global variable lonLoadLim
+     my $loadavg;
+     my $loadfile=IO::File->new('/proc/loadavg');
+     $loadavg=<$loadfile>;
+     $loadavg =~ s/\s.*//g;                      # Extract the first field only.
+     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
+     &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("load", \&load_handler, 0, 1, 0);
+ #
+ #   Process the userload request.  This sub returns to the client the current
+ #  user load average.  It can be invoked either by clients or managers.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the hsot we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit inputs:
+ #     whatever the userload() function requires.
+ #  Implicit outputs:
+ #     the reply is written to the client.
+ #
+ sub user_load_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $userloadpercent=&Apache::lonnet::userload();
+     &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("userload", \&user_load_handler, 0, 1, 0);
+ #   Process a request for the authorization type of a user:
+ #   (userauth).
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit outputs:
+ #    The user authorization type is written to the client.
+ #
+ sub user_authorization_type {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $userinput = "$cmd:$tail";
+     #  Pull the domain and username out of the command tail.
+     # and call get_auth_type to determine the authentication type.
+     my ($udom,$uname)=split(/:/,$tail);
+     my $result = &get_auth_type($udom, $uname);
+     if($result eq "nouser") {
+ 	&Failure( $replyfd, "unknown_user\n", $userinput);
+     } else {
+ 	#
+ 	# We only want to pass the second field from get_auth_type
+ 	# for ^krb.. otherwise we'll be handing out the encrypted
+ 	# password for internals e.g.
+ 	#
+ 	my ($type,$otherinfo) = split(/:/,$result);
+ 	if($type =~ /^krb/) {
+ 	    $type = $result;
+ 	} else {
+             $type .= ':';
+         }
+ 	&Reply( $replyfd, "$type\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
+ #   Process a request by a manager to push a hosts or domain table
+ #   to us.  We pick apart the command and pass it on to the subs
+ #   that already exist to do this.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit Output:
+ #    a reply is written to the client.
+ sub push_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     # At this time we only know that the IP of our partner is a valid manager
+     # the code below is a hook to do further authentication (e.g. to resolve
+     # spoofing).
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	# Now presumably we have the bona fides of both the peer host and the
+ 	# process making the request.
+ 	my $reply = &PushFile($userinput);
+ 	&Reply($client, "$reply\n", $userinput);
+     } else {
+ 	&Failure( $client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
+ #
+ #   du  - list the disk usuage of a directory recursively.
+ #
+ #   note: stolen code from the ls file handler
+ #   under construction by Rick Banghart
+ #    .
+ # Parameters:
+ #    $cmd        - The command that dispatched us (du).
+ #    $ududir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub du_handler {
+     my ($cmd, $ududir, $client) = @_;
+     ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
+     my $userinput = "$cmd:$ududir";
+     if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
+ 	&Failure($client,"refused\n","$cmd:$ududir");
+ 	return 1;
+     }
+     #  Since $ududir could have some nasties in it,
+     #  we will require that ududir is a valid
+     #  directory.  Just in case someone tries to
+     #  slip us a  line like .;(cd /home/httpd rm -rf*)
+     #  etc.
+     #
+     if (-d $ududir) {
+ 	my $total_size=0;
+ 	my $code=sub {
+ 	    if ($_=~/\.\d+\./) { return;}
+ 	    if ($_=~/\.meta$/) { return;}
+ 	    if (-d $_)         { return;}
+ 	    $total_size+=(stat($_))[7];
+ 	};
+ 	chdir($ududir);
+ 	find($code,$ududir);
+ 	$total_size=int($total_size/1024);
+ 	&Reply($client,"$total_size\n","$cmd:$ududir");
+     } else {
+ 	&Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
+     }
+     return 1;
+ }
+ &register_handler("du", \&du_handler, 0, 1, 0);
+ #
+ # The ls_handler routine should be considered obosolete and is retained
+ # for communication with legacy servers.  Please see the ls2_handler.
+ #
+ #   ls  - list the contents of a directory.  For each file in the
+ #    selected directory the filename followed by the full output of
+ #    the stat function is returned.  The returned info for each
+ #    file are separated by ':'.  The stat fields are separated by &'s.
+ # Parameters:
+ #    $cmd        - The command that dispatched us (ls).
+ #    $ulsdir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub ls_handler {
+     # obsoleted by ls2_handler
+     my ($cmd, $ulsdir, $client) = @_;
+     my $userinput = "$cmd:$ulsdir";
+     my $obs;
+     my $rights;
+     my $ulsout='';
+     my $ulsfn;
+     if (-e $ulsdir) {
+ 	if(-d $ulsdir) {
+ 	    if (opendir(LSDIR,$ulsdir)) {
+ 		while ($ulsfn=readdir(LSDIR)) {
+ 		    undef($obs);
+ 		    undef($rights);
+ 		    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+ 		    #We do some obsolete checking here
+ 		    if(-e $ulsdir.'/'.$ulsfn.".meta") {
+ 			open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+ 			my @obsolete=<FILE>;
+ 			foreach my $obsolete (@obsolete) {
+ 			    if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
+ 			    if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
+ 			}
+ 		    }
+ 		    $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
+ 		    if($obs eq '1') { $ulsout.="&1"; }
+ 		    else { $ulsout.="&0"; }
+ 		    if($rights eq '1') { $ulsout.="&1:"; }
+ 		    else { $ulsout.="&0:"; }
+ 		}
+ 		closedir(LSDIR);
+ 	    }
+ 	} else {
+ 	    my @ulsstats=stat($ulsdir);
+ 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+ 	}
+     } else {
+ 	$ulsout='no_such_dir';
+     }
+     if ($ulsout eq '') { $ulsout='empty'; }
+     &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
+     return 1;
+ }
+ &register_handler("ls", \&ls_handler, 0, 1, 0);
+ #
+ # Please also see the ls_handler, which this routine obosolets.
+ # ls2_handler differs from ls_handler in that it escapes its return
+ # values before concatenating them together with ':'s.
+ #
+ #   ls2  - list the contents of a directory.  For each file in the
+ #    selected directory the filename followed by the full output of
+ #    the stat function is returned.  The returned info for each
+ #    file are separated by ':'.  The stat fields are separated by &'s.
+ # Parameters:
+ #    $cmd        - The command that dispatched us (ls).
+ #    $ulsdir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub ls2_handler {
+     my ($cmd, $ulsdir, $client) = @_;
+     my $userinput = "$cmd:$ulsdir";
+     my $obs;
+     my $rights;
+     my $ulsout='';
+     my $ulsfn;
+     if (-e $ulsdir) {
+         if(-d $ulsdir) {
+             if (opendir(LSDIR,$ulsdir)) {
+                 while ($ulsfn=readdir(LSDIR)) {
+                     undef($obs);
+ 		    undef($rights);
+                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+                     #We do some obsolete checking here
+                     if(-e $ulsdir.'/'.$ulsfn.".meta") {
+                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+                         my @obsolete=<FILE>;
+                         foreach my $obsolete (@obsolete) {
+                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
+                             if($obsolete =~ m|(<copyright>)(default)|) {
+                                 $rights = 1;
+                             }
+                         }
+                     }
+                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
+                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     $ulsout.= &escape($tmp).':';
+                 }
+                 closedir(LSDIR);
+             }
+         } else {
+             my @ulsstats=stat($ulsdir);
+             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+         }
+     } else {
+         $ulsout='no_such_dir';
+    }
+    if ($ulsout eq '') { $ulsout='empty'; }
+    &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
+    return 1;
+ }
+ &register_handler("ls2", \&ls2_handler, 0, 1, 0);
+ #   Process a reinit request.  Reinit requests that either
+ #   lonc or lond be reinitialized so that an updated
+ #   host.tab or domain.tab can be processed.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ #  Implicit output:
+ #     a reply is sent to the client.
+ #
+ sub reinit_process_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	chomp($userinput);
+ 	my $reply = &ReinitProcess($userinput);
+ 	&Reply( $client,  "$reply\n", $userinput);
+     } else {
+ 	&Failure( $client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
+ #  Process the editing script for a table edit operation.
+ #  the editing operation must be encrypted and requested by
+ #  a manager host.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ #  Implicit output:
+ #     a reply is sent to the client.
+ #
+ sub edit_table_handler {
+     my ($command, $tail, $client) = @_;
+     my $userinput = "$command:$tail";
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	my($filetype, $script) = split(/:/, $tail);
+ 	if (($filetype eq "hosts") ||
+ 	    ($filetype eq "domain")) {
+ 	    if($script ne "") {
+ 		&Reply($client,              # BUGBUG - EditFile
+ 		      &EditFile($userinput), #   could fail.
+ 		      $userinput);
+ 	    } else {
+ 		&Failure($client,"refused\n",$userinput);
+ 	    }
+ 	} else {
+ 	    &Failure($client,"refused\n",$userinput);
+ 	}
+     } else {
+ 	&Failure($client,"refused\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("edit", \&edit_table_handler, 1, 0, 1);
+ #
+ #   Authenticate a user against the LonCAPA authentication
+ #   database.  Note that there are several authentication
+ #   possibilities:
+ #   - unix     - The user can be authenticated against the unix
+ #                password file.
+ #   - internal - The user can be authenticated against a purely
+ #                internal per user password file.
+ #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
+ #                ticket granting authority.
+ #   - user     - The person tailoring LonCAPA can supply a user authentication
+ #                mechanism that is per system.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub authenticate_handler {
+     my ($cmd, $tail, $client) = @_;
+     #  Regenerate the full input line
+     my $userinput  = $cmd.":".$tail;
+     #  udom    - User's domain.
+     #  uname   - Username.
+     #  upass   - User's password.
+     my ($udom,$uname,$upass)=split(/:/,$tail);
+     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
+     chomp($upass);
+     $upass=&unescape($upass);
+     my $pwdcorrect = &validate_user($udom, $uname, $upass);
+     if($pwdcorrect) {
+ 	&Reply( $client, "authorized\n", $userinput);
+ 	#
+ 	#  Bad credentials: Failed to authorize
+ 	#
+     } else {
+ 	&Failure( $client, "non_authorized\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("auth", \&authenticate_handler, 1, 1, 0);
+ #
+ #   Change a user's password.  Note that this function is complicated by
+ #   the fact that a user may be authenticated in more than one way:
+ #   At present, we are not able to change the password for all types of
+ #   authentication methods.  Only for:
+ #      unix    - unix password or shadow passoword style authentication.
+ #      local   - Locally written authentication mechanism.
+ #   For now, kerb4 and kerb5 password changes are not supported and result
+ #   in an error.
+ # FUTURE WORK:
+ #    Support kerberos passwd changes?
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ sub change_password_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
+     #
+     #  udom  - user's domain.
+     #  uname - Username.
+     #  upass - Current password.
+     #  npass - New password.
+     #  context - Context in which this was called
+     #            (preferences or reset_by_email).
+     my ($udom,$uname,$upass,$npass,$context)=split(/:/,$tail);
+     $upass=&unescape($upass);
+     $npass=&unescape($npass);
+     &Debug("Trying to change password for $uname");
+     # First require that the user can be authenticated with their
+     # old password unless context was 'reset_by_email':
+     my $validated;
+     if ($context eq 'reset_by_email') {
+         $validated = 1;
+     } else {
+         $validated = &validate_user($udom, $uname, $upass);
+     }
+     if($validated) {
+ 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
+ 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
+ 	if ($howpwd eq 'internal') {
+ 	    &Debug("internal auth");
+ 	    my $salt=time;
+ 	    $salt=substr($salt,6,2);
+ 	    my $ncpass=crypt($npass,$salt);
+ 	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
+ 		&logthis("Result of password change for "
+ 			 ."$uname: pwchange_success");
+ 		&Reply($client, "ok\n", $userinput);
+ 	    } else {
+ 		&logthis("Unable to open $uname passwd "
+ 			 ."to change password");
+ 		&Failure( $client, "non_authorized\n",$userinput);
+ 	    }
+ 	} elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
+ 	    my $result = &change_unix_password($uname, $npass);
+ 	    &logthis("Result of password change for $uname: ".
+ 		     $result);
+ 	    &Reply($client, "$result\n", $userinput);
+ 	} else {
+ 	    # this just means that the current password mode is not
+ 	    # one we know how to change (e.g the kerberos auth modes or
+ 	    # locally written auth handler).
+ 	    #
+ 	    &Failure( $client, "auth_mode_error\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "non_authorized\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("passwd", \&change_password_handler, 1, 1, 0);
+ #
+ #   Create a new user.  User in this case means a lon-capa user.
+ #   The user must either already exist in some authentication realm
+ #   like kerberos or the /etc/passwd.  If not, a user completely local to
+ #   this loncapa system is created.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ sub add_user_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
+     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
+     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
+     if($udom eq $currentdomainid) { # Reject new users for other domains...
+ 	my $oldumask=umask(0077);
+ 	chomp($npass);
+ 	$npass=&unescape($npass);
+ 	my $passfilename  = &password_path($udom, $uname);
+ 	&Debug("Password file created will be:".$passfilename);
+ 	if (-e $passfilename) {
+ 	    &Failure( $client, "already_exists\n", $userinput);
+ 	} else {
+ 	    my $fperror='';
+ 	    if (!&mkpath($passfilename)) {
+ 		$fperror="error: ".($!+0)." mkdir failed while attempting "
+ 		    ."makeuser";
+ 	    }
+ 	    unless ($fperror) {
+ 		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
+ 		&Reply($client, $result, $userinput);     #BUGBUG - could be fail
+ 	    } else {
+ 		&Failure($client, "$fperror\n", $userinput);
+ 	    }
+ 	}
+ 	umask($oldumask);
+     }  else {
+ 	&Failure($client, "not_right_domain\n",
+ 		$userinput);	# Even if we are multihomed.
+     }
+     return 1;
+ }
+ &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
+ #
+ #   Change the authentication method of a user.  Note that this may
+ #   also implicitly change the user's password if, for example, the user is
+ #   joining an existing authentication realm.  Known authentication realms at
+ #   this time are:
+ #    internal   - Purely internal password file (only loncapa knows this user)
+ #    local      - Institutionally written authentication module.
+ #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
+ #    kerb4      - kerberos version 4
+ #    kerb5      - kerberos version 5
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ # NOTE:
+ #   This is also used to change the authentication credential values (e.g. passwd).
+ #
+ #
+ sub change_authentication_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = "$cmd:$tail";              # Reconstruct user input.
+     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
+     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
+     if ($udom ne $currentdomainid) {
+ 	&Failure( $client, "not_right_domain\n", $client);
+     } else {
+ 	chomp($npass);
+ 	$npass=&unescape($npass);
+ 	my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
+ 	my $passfilename = &password_path($udom, $uname);
+ 	if ($passfilename) {	# Not allowed to create a new user!!
+ 	    # If just changing the unix passwd. need to arrange to run
+ 	    # passwd since otherwise make_passwd_file will run
+ 	    # lcuseradd which fails if an account already exists
+ 	    # (to prevent an unscrupulous LONCAPA admin from stealing
+ 	    # an existing account by overwriting it as a LonCAPA account).
+ 	    if(($oldauth =~/^unix/) && ($umode eq "unix")) {
+ 		my $result = &change_unix_password($uname, $npass);
+ 		&logthis("Result of password change for $uname: ".$result);
+ 		if ($result eq "ok") {
+ 		    &Reply($client, "$result\n")
+ 		} else {
+ 		    &Failure($client, "$result\n");
+ 		}
+ 	    } else {
+ 		my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
+ 		#
+ 		#  If the current auth mode is internal, and the old auth mode was
+ 		#  unix, or krb*,  and the user is an author for this domain,
+ 		#  re-run manage_permissions for that role in order to be able
+ 		#  to take ownership of the construction space back to www:www
+ 		#
+ 		if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
+ 		    (($oldauth =~ /^internal/) && ($umode eq "unix")) ) {
+ 		    if(&is_author($udom, $uname)) {
+ 			&Debug(" Need to manage author permissions...");
+ 			&manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
+ 		    }
+ 		}
+ 		&Reply($client, $result, $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
+ #
+ #   Determines if this is the home server for a user.  The home server
+ #   for a user will have his/her lon-capa passwd file.  Therefore all we need
+ #   to do is determine if this file exists.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub is_home_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = "$cmd:$tail";
+     my ($udom,$uname)=split(/:/,$tail);
+     chomp($uname);
+     my $passfile = &password_filename($udom, $uname);
+     if($passfile) {
+ 	&Reply( $client, "found\n", $userinput);
+     } else {
+ 	&Failure($client, "not_found\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("home", \&is_home_handler, 0,1,0);
+ #
+ #   Process an update request for a resource?? I think what's going on here is
+ #   that a resource has been modified that we hold a subscription to.
+ #   If the resource is not local, then we must update, or at least invalidate our
+ #   cached copy of the resource.
+ #   FUTURE WORK:
+ #      I need to look at this logic carefully.  My druthers would be to follow
+ #      typical caching logic, and simple invalidate the cache, drop any subscription
+ #      an let the next fetch start the ball rolling again... however that may
+ #      actually be more difficult than it looks given the complex web of
+ #      proxy servers.
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub update_resource_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $fname= $tail;		# This allows interactive testing
+     my $ownership=ishome($fname);
+     if ($ownership eq 'not_owner') {
+ 	if (-e $fname) {
+ 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
+ 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
+ 	    my $now=time;
+ 	    my $since=$now-$atime;
+ 	    if ($since>$perlvar{'lonExpire'}) {
+ 		my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
+ 		&devalidate_meta_cache($fname);
+ 		unlink("$fname");
+ 		unlink("$fname.meta");
+ 	    } else {
+ 		my $transname="$fname.in.transfer";
+ 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
+ 		my $response;
+ 		alarm(120);
+ 		{
+ 		    my $ua=new LWP::UserAgent;
+ 		    my $request=new HTTP::Request('GET',"$remoteurl");
+ 		    $response=$ua->request($request,$transname);
+ 		}
+ 		alarm(0);
+ 		if ($response->is_error()) {
+ 		    unlink($transname);
+ 		    my $message=$response->status_line;
+ 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
+ 		} else {
+ 		    if ($remoteurl!~/\.meta$/) {
+ 			alarm(120);
+ 			{
+ 			    my $ua=new LWP::UserAgent;
+ 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
+ 			    my $mresponse=$ua->request($mrequest,$fname.'.meta');
+ 			    if ($mresponse->is_error()) {
+ 				unlink($fname.'.meta');
+ 			    }
+ 			}
+ 			alarm(0);
+ 		    }
+ 		    rename($transname,$fname);
+ 		    &devalidate_meta_cache($fname);
+ 		}
+ 	    }
+ 	    &Reply( $client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "not_found\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "rejected\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("update", \&update_resource_handler, 0 ,1, 0);
+ sub devalidate_meta_cache {
+     my ($url) = @_;
+     use Cache::Memcached;
+     my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
+     $url = &Apache::lonnet::declutter($url);
+     $url =~ s-\.meta$--;
+     my $id = &escape('meta:'.$url);
+     $memcache->delete($id);
+ }
+ #
+ #   Fetch a user file from a remote server to the user's home directory
+ #   userfiles subdir.
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub fetch_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $fname           = $tail;
+     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     my $udir=&propath($udom,$uname).'/userfiles';
+     unless (-e $udir) {
+ 	mkdir($udir,0770);
+     }
+     Debug("fetch user file for $fname");
+     if (-e $udir) {
+ 	$ufile=~s/^[\.\~]+//;
+ 	# IF necessary, create the path right down to the file.
+ 	# Note that any regular files in the way of this path are
+ 	# wiped out to deal with some earlier folly of mine.
+ 	if (!&mkpath($udir.'/'.$ufile)) {
+ 	    &Failure($client, "unable_to_create\n", $userinput);
+ 	}
+ 	my $destname=$udir.'/'.$ufile;
+ 	my $transname=$udir.'/'.$ufile.'.in.transit';
+ 	my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
+ 	my $response;
+ 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
+ 	alarm(120);
+ 	{
+ 	    my $ua=new LWP::UserAgent;
+ 	    my $request=new HTTP::Request('GET',"$remoteurl");
+ 	    $response=$ua->request($request,$transname);
+ 	}
+ 	alarm(0);
+ 	if ($response->is_error()) {
+ 	    unlink($transname);
+ 	    my $message=$response->status_line;
+ 	    &logthis("LWP GET: $message for $fname ($remoteurl)");
+ 	    &Failure($client, "failed\n", $userinput);
+ 	} else {
+ 	    Debug("Renaming $transname to $destname");
+ 	    if (!rename($transname,$destname)) {
+ 		&logthis("Unable to move $transname to $destname");
+ 		unlink($transname);
+ 		&Failure($client, "failed\n", $userinput);
+ 	    } else {
+ 		&Reply($client, "ok\n", $userinput);
+ 	    }
+ 	}
+     } else {
+ 	&Failure($client, "not_home\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
+ #
+ #   Remove a file from a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
+ #
+ # Returns:
+ #    1    - Continue processing.
+ sub remove_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
+     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     if ($ufile =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse
+ 	# to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $file=$udir.'/userfiles/'.$ufile;
+ 	    if (-e $file) {
+ 		#
+ 		#   If the file is a regular file unlink is fine...
+ 		#   However it's possible the client wants a dir.
+ 		#   removed, in which case rmdir is more approprate:
+ 		#
+ 	        if (-f $file){
+ 		    unlink($file);
+ 		} elsif(-d $file) {
+ 		    rmdir($file);
+ 		}
+ 		if (-e $file) {
+ 		    #  File is still there after we deleted it ?!?
+ 		    &Failure($client, "failed\n", "$cmd:$tail");
+ 		} else {
+ 		    &Reply($client, "ok\n", "$cmd:$tail");
+ 		}
+ 	    } else {
+ 		&Failure($client, "not_found\n", "$cmd:$tail");
+ 	    }
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
+ #
+ #   make a directory in a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
+ #
+ # Returns:
+ #    1    - Continue processing.
+ sub mkdir_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
+     $dir=&unescape($dir);
+     my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     if ($ufile =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse
+ 	# to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $newdir=$udir.'/userfiles/'.$ufile.'/';
+ 	    if (!&mkpath($newdir)) {
+ 		&Failure($client, "failed\n", "$cmd:$tail");
+ 	    }
+ 	    &Reply($client, "ok\n", "$cmd:$tail");
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
+ #
+ #   rename a file in a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
+ #
+ # Returns:
+ #    1    - Continue processing.
+ sub rename_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($udom,$uname,$old,$new) = split(/:/, $tail);
+     $old=&unescape($old);
+     $new=&unescape($new);
+     if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $oldfile=$udir.'/userfiles/'.$old;
+ 	    my $newfile=$udir.'/userfiles/'.$new;
+ 	    if (-e $newfile) {
+ 		&Failure($client, "exists\n", "$cmd:$tail");
+ 	    } elsif (! -e $oldfile) {
+ 		&Failure($client, "not_found\n", "$cmd:$tail");
+ 	    } else {
+ 		if (!rename($oldfile,$newfile)) {
+ 		    &Failure($client, "failed\n", "$cmd:$tail");
+ 		} else {
+ 		    &Reply($client, "ok\n", "$cmd:$tail");
+ 		}
+ 	    }
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
+ #
+ #  Authenticate access to a user file by checking that the token the user's
+ #  passed also exists in their session file
+ #
+ # Parameters:
+ #   cmd      - The request keyword that dispatched to tus.
+ #   tail     - The tail of the request (colon separated parameters).
+ #   client   - Filehandle open on the client.
+ # Return:
+ #    1.
+ sub token_auth_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($fname, $session) = split(/:/, $tail);
+     chomp($session);
+     my $reply="non_auth\n";
+     my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
+     if (open(ENVIN,"$file")) {
+ 	flock(ENVIN,LOCK_SH);
+ 	tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640);
+ 	if (exists($disk_env{"userfile.$fname"})) {
+ 	    $reply="ok\n";
+ 	} else {
+ 	    foreach my $envname (keys(%disk_env)) {
+ 		if ($envname=~ m|^userfile\.\Q$fname\E|) {
+ 		    $reply="ok\n";
+ 		    last;
+ 		}
+ 	    }
+ 	}
+ 	untie(%disk_env);
+ 	close(ENVIN);
+ 	&Reply($client, $reply, "$cmd:$tail");
+     } else {
+ 	&Failure($client, "invalid_token\n", "$cmd:$tail");
+     }
+     return 1;
+ }
+ &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
+ #
+ #   Unsubscribe from a resource.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub unsubscribe_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($fname) = split(/:/,$tail); # Split in case there's extrs.
+     &Debug("Unsubscribing $fname");
+     if (-e $fname) {
+ 	&Debug("Exists");
+ 	&Reply($client, &unsub($fname,$clientip), $userinput);
+     } else {
+ 	&Failure($client, "not_found\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
+ #   Subscribe to a resource
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub subscribe_handler {
+     my ($cmd, $tail, $client)= @_;
+     my $userinput  = "$cmd:$tail";
+     &Reply( $client, &subscribe($userinput,$clientip), $userinput);
+     return 1;
+ }
+ &register_handler("sub", \&subscribe_handler, 0, 1, 0);
+ #
+ #   Determine the version of a resource (?) Or is it return
+ #   the top version of the resource?  Not yet clear from the
+ #   code in currentversion.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub current_version_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my $fname   = $tail;
+     &Reply( $client, &currentversion($fname)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
+ #  Make an entry in a user's activity log.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub activity_log_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($udom,$uname,$what)=split(/:/,$tail);
+     chomp($what);
+     my $proname=&propath($udom,$uname);
+     my $now=time;
+     my $hfh;
+     if ($hfh=IO::File->new(">>$proname/activity.log")) {
+ 	print $hfh "$now:$clientname:$what\n";
+ 	&Reply( $client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)." IO::File->new Failed "
+ 		 ."while attempting log\n",
+ 		 $userinput);
+     }
+     return 1;
+ }
+ &register_handler("log", \&activity_log_handler, 0, 1, 0);
+ #
+ #   Put a namespace entry in a user profile hash.
+ #   My druthers would be for this to be an encrypted interaction too.
+ #   anything that might be an inadvertent covert channel about either
+ #   user authentication or user personal information....
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub put_user_profile_entry {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
+     if ($namespace ne 'roles') {
+ 	chomp($what);
+ 	my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				  &GDBM_WRCREAT(),"P",$what);
+ 	if($hashref) {
+ 	    my @pairs=split(/\&/,$what);
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+ 		$hashref->{$key}=$value;
+ 	    }
+ 	    if (&untie_user_hash($hashref)) {
+ 		&Reply( $client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ 			"while attempting put\n",
+ 			$userinput);
+ 	    }
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting put\n", $userinput);
+ 	}
+     } else {
+         &Failure( $client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
+ #   Put a piece of new data in hash, returns error if entry already exists
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub newput_user_profile_entry {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
+     if ($namespace eq 'roles') {
+         &Failure( $client, "refused\n", $userinput);
+ 	return 1;
+     }
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(),"N",$what);
+     if(!$hashref) {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		  "while attempting put\n", $userinput);
+ 	return 1;
+     }
+     my @pairs=split(/\&/,$what);
+     foreach my $pair (@pairs) {
+ 	my ($key,$value)=split(/=/,$pair);
+ 	if (exists($hashref->{$key})) {
+ 	    &Failure($client, "key_exists: ".$key."\n",$userinput);
+ 	    return 1;
+ 	}
+     }
+     foreach my $pair (@pairs) {
+ 	my ($key,$value)=split(/=/,$pair);
+ 	$hashref->{$key}=$value;
+     }
+     if (&untie_user_hash($hashref)) {
+ 	&Reply( $client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ 		 "while attempting put\n",
+ 		 $userinput);
+     }
+     return 1;
+ }
+ &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
+ #
+ #   Increment a profile entry in the user history file.
+ #   The history contains keyword value pairs.  In this case,
+ #   The value itself is a pair of numbers.  The first, the current value
+ #   the second an increment that this function applies to the current
+ #   value.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub increment_user_value_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput   = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
+     if ($namespace ne 'roles') {
+         chomp($what);
+ 	my $hashref = &tie_user_hash($udom, $uname,
+ 				     $namespace, &GDBM_WRCREAT(),
+ 				     "P",$what);
+ 	if ($hashref) {
+ 	    my @pairs=split(/\&/,$what);
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+                 $value = &unescape($value);
+ 		# We could check that we have a number...
+ 		if (! defined($value) || $value eq '') {
+ 		    $value = 1;
+ 		}
+ 		$hashref->{$key}+=$value;
+                 if ($namespace eq 'nohist_resourcetracker') {
+                     if ($hashref->{$key} < 0) {
+                         $hashref->{$key} = 0;
+                     }
+                 }
+ 	    }
+ 	    if (&untie_user_hash($hashref)) {
+ 		&Reply( $client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ 			 "while attempting inc\n", $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting inc\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
+ #
+ #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
+ #   Each 'role' a user has implies a set of permissions.  Adding a new role
+ #   for a person grants the permissions packaged with that role
+ #   to that user when the role is selected.
+ #
+ # Parameters:
+ #    $cmd       - The command string (rolesput).
+ #    $tail      - The remainder of the request line.  For rolesput this
+ #                 consists of a colon separated list that contains:
+ #                 The domain and user that is granting the role (logged).
+ #                 The domain and user that is getting the role.
+ #                 The roles being granted as a set of & separated pairs.
+ #                 each pair a key value pair.
+ #    $client    - File descriptor connected to the client.
+ # Returns:
+ #     0         - If the daemon should exit
+ #     1         - To continue processing.
+ #
+ #
+ sub roles_put_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = "$cmd:$tail";
+     my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
+     my $namespace='roles';
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(), "P",
+ 				 "$exedom:$exeuser:$what");
+     #
+     #  Log the attempt to set a role.  The {}'s here ensure that the file
+     #  handle is open for the minimal amount of time.  Since the flush
+     #  is done on close this improves the chances the log will be an un-
+     #  corrupted ordered thing.
+     if ($hashref) {
+ 	my $pass_entry = &get_auth_type($udom, $uname);
+ 	my ($auth_type,$pwd)  = split(/:/, $pass_entry);
+ 	$auth_type = $auth_type.":";
+ 	my @pairs=split(/\&/,$what);
+ 	foreach my $pair (@pairs) {
+ 	    my ($key,$value)=split(/=/,$pair);
+ 	    &manage_permissions($key, $udom, $uname,
+ 			       $auth_type);
+ 	    $hashref->{$key}=$value;
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting rolesput\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting rolesput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
+ #
+ #   Deletes (removes) a role for a user.   This is equivalent to removing
+ #  a permissions package associated with the role from the user's profile.
+ #
+ # Parameters:
+ #     $cmd                 - The command (rolesdel)
+ #     $tail                - The remainder of the request line. This consists
+ #                             of:
+ #                             The domain and user requesting the change (logged)
+ #                             The domain and user being changed.
+ #                             The roles being revoked.  These are shipped to us
+ #                             as a bunch of & separated role name keywords.
+ #     $client              - The file handle open on the client.
+ # Returns:
+ #     1                    - Continue processing
+ #     0                    - Exit.
+ #
+ sub roles_delete_handler {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput    = "$cmd:$tail";
+     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
+     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
+ 	   "what = ".$what);
+     my $namespace='roles';
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(), "D",
+ 				 "$exedom:$exeuser:$what");
+     if ($hashref) {
+ 	my @rolekeys=split(/\&/,$what);
+ 	foreach my $key (@rolekeys) {
+ 	    delete $hashref->{$key};
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting rolesdel\n", $userinput);
+ 	}
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting rolesdel\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
+ # Unencrypted get from a user's profile database.  See
+ # GetProfileEntryEncrypted for a version that does end-to-end encryption.
+ # This function retrieves a keyed item from a specific named database in the
+ # user's directory.
+ #
+ # Parameters:
+ #   $cmd             - Command request keyword (get).
+ #   $tail            - Tail of the command.  This is a colon separated list
+ #                      consisting of the domain and username that uniquely
+ #                      identifies the profile,
+ #                      The 'namespace' which selects the gdbm file to
+ #                      do the lookup in,
+ #                      & separated list of keys to lookup.  Note that
+ #                      the values are returned as an & separated list too.
+ #   $client          - File descriptor open on the client.
+ # Returns:
+ #   1       - Continue processing.
+ #   0       - Exit.
+ #
+ sub get_profile_entry {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+     chomp($what);
+     my $replystring = read_profile($udom, $uname, $namespace, $what);
+     my ($first) = split(/:/,$replystring);
+     if($first ne "error") {
+ 	&Reply($client, "$replystring\n", $userinput);
+     } else {
+ 	&Failure($client, $replystring." while attempting get\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("get", \&get_profile_entry, 0,1,0);
+ #
+ #  Process the encrypted get request.  Note that the request is sent
+ #  in clear, but the reply is encrypted.  This is a small covert channel:
+ #  information about the sensitive keys is given to the snooper.  Just not
+ #  information about the values of the sensitive key.  Hmm if I wanted to
+ #  know these I'd snoop for the egets. Get the profile item names from them
+ #  and then issue a get for them since there's no enforcement of the
+ #  requirement of an encrypted get for particular profile items.  If I
+ #  were re-doing this, I'd force the request to be encrypted as well as the
+ #  reply.  I'd also just enforce encrypted transactions for all gets since
+ #  that would prevent any covert channel snooping.
+ #
+ #  Parameters:
+ #     $cmd               - Command keyword of request (eget).
+ #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
+ #     $client            - File open on the client.
+ #  Returns:
+ #     1      - Continue processing
+ #     0      - server should exit.
+ sub get_profile_entry_encrypted {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+     chomp($what);
+     my $qresult = read_profile($udom, $uname, $namespace, $what);
+     my ($first) = split(/:/, $qresult);
+     if($first ne "error") {
+ 	if ($cipher) {
+ 	    my $cmdlength=length($qresult);
+ 	    $qresult.="         ";
+ 	    my $encqresult='';
+ 	    for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+ 		$encqresult.= unpack("H16",
+ 				     $cipher->encrypt(substr($qresult,
+ 							     $encidx,
+)));
+ 	    }
+ 	    &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
+ 	} else {
+ 		&Failure( $client, "error:no_key\n", $userinput);
+ 	    }
+     } else {
+ 	&Failure($client, "$qresult while attempting eget\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
+ #
+ #   Deletes a key in a user profile database.
+ #
+ #   Parameters:
+ #       $cmd                  - Command keyword (del).
+ #       $tail                 - Command tail.  IN this case a colon
+ #                               separated list containing:
+ #                               The domain and user that identifies uniquely
+ #                               the identity of the user.
+ #                               The profile namespace (name of the profile
+ #                               database file).
+ #                               & separated list of keywords to delete.
+ #       $client              - File open on client socket.
+ # Returns:
+ #     1   - Continue processing
+ #     0   - Exit server.
+ #
+ #
+ sub delete_profile_entry {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "cmd:$tail";
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(),
+ 				 "D",$what);
+     if ($hashref) {
+         my @keys=split(/\&/,$what);
+ 	foreach my $key (@keys) {
+ 	    delete($hashref->{$key});
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting del\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting del\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("del", \&delete_profile_entry, 0, 1, 0);
+ #
+ #  List the set of keys that are defined in a profile database file.
+ #  A successful reply from this will contain an & separated list of
+ #  the keys.
+ # Parameters:
+ #     $cmd              - Command request (keys).
+ #     $tail             - Remainder of the request, a colon separated
+ #                         list containing domain/user that identifies the
+ #                         user being queried, and the database namespace
+ #                         (database filename essentially).
+ #     $client           - File open on the client.
+ #  Returns:
+ #    1    - Continue processing.
+ #    0    - Exit the server.
+ #
+ sub get_profile_keys {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace)=split(/:/,$tail);
+     my $qresult='';
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				  &GDBM_READER());
+     if ($hashref) {
+ 	foreach my $key (keys %$hashref) {
+ 	    $qresult.="$key&";
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting keys\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting keys\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("keys", \&get_profile_keys, 0, 1, 0);
+ #
+ #   Dump the contents of a user profile database.
+ #   Note that this constitutes a very large covert channel too since
+ #   the dump will return sensitive information that is not encrypted.
+ #   The naive security assumption is that the session negotiation ensures
+ #   our client is trusted and I don't believe that's assured at present.
+ #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
+ #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
+ #
+ #  Parameters:
+ #     $cmd           - The command request keyword (currentdump).
+ #     $tail          - Remainder of the request, consisting of a colon
+ #                      separated list that has the domain/username and
+ #                      the namespace to dump (database file).
+ #     $client        - file open on the remote client.
+ # Returns:
+ #     1    - Continue processing.
+ #     0    - Exit the server.
+ #
+ sub dump_profile_database {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace) = split(/:/,$tail);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+ 	# Structure of %data:
+ 	# $data{$symb}->{$parameter}=$value;
+ 	# $data{$symb}->{'v.'.$parameter}=$version;
+ 	# since $parameter will be unescaped, we do not
+  	# have to worry about silly parameter names...
+         my $qresult='';
+ 	my %data = ();                     # A hash of anonymous hashes..
+ 	while (my ($key,$value) = each(%$hashref)) {
+ 	    my ($v,$symb,$param) = split(/:/,$key);
+ 	    next if ($v eq 'version' || $symb eq 'keys');
+ 	    next if (exists($data{$symb}) &&
+ 		     exists($data{$symb}->{$param}) &&
+ 		     $data{$symb}->{'v.'.$param} > $v);
+ 	    $data{$symb}->{$param}=$value;
+ 	    $data{$symb}->{'v.'.$param}=$v;
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    while (my ($symb,$param_hash) = each(%data)) {
+ 		while(my ($param,$value) = each (%$param_hash)){
+ 		    next if ($param =~ /^v\./);       # Ignore versions...
+ 		    #
+ 		    #   Just dump the symb=value pairs separated by &
+ 		    #
+ 		    $qresult.=$symb.':'.$param.'='.$value.'&';
+ 		}
+ 	    }
+ 	    chop($qresult);
+ 	    &Reply($client , "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting currentdump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting currentdump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
+ #
+ #   Dump a profile database with an optional regular expression
+ #   to match against the keys.  In this dump, no effort is made
+ #   to separate symb from version information. Presumably the
+ #   databases that are dumped by this command are of a different
+ #   structure.  Need to look at this and improve the documentation of
+ #   both this and the currentdump handler.
+ # Parameters:
+ #    $cmd                     - The command keyword.
+ #    $tail                    - All of the characters after the $cmd:
+ #                               These are expected to be a colon
+ #                               separated list containing:
+ #                               domain/user - identifying the user.
+ #                               namespace   - identifying the database.
+ #                               regexp      - optional regular expression
+ #                                             that is matched against
+ #                                             database keywords to do
+ #                                             selective dumps.
+ #   $client                   - Channel open on the client.
+ # Returns:
+ #    1    - Continue processing.
+ # Side effects:
+ #    response is written to $client.
+ #
+ sub dump_with_regexp {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
+     if (defined($regexp)) {
+ 	$regexp=&unescape($regexp);
+     } else {
+ 	$regexp='.';
+     }
+     my ($start,$end);
+     if (defined($range)) {
+ 	if ($range =~/^(\d+)\-(\d+)$/) {
+ 	    ($start,$end) = ($1,$2);
+ 	} elsif ($range =~/^(\d+)$/) {
+ 	    ($start,$end) = (0,$1);
+ 	} else {
+ 	    undef($range);
+ 	}
+     }
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+         my $qresult='';
+ 	my $count=0;
+ 	while (my ($key,$value) = each(%$hashref)) {
+ 	    if ($regexp eq '.') {
+ 		$count++;
+ 		if (defined($range) && $count >= $end)   { last; }
+ 		if (defined($range) && $count <  $start) { next; }
+ 		$qresult.=$key.'='.$value.'&';
+ 	    } else {
+ 		my $unescapeKey = &unescape($key);
+ 		if (eval('$unescapeKey=~/$regexp/')) {
+ 		    $count++;
+ 		    if (defined($range) && $count >= $end)   { last; }
+ 		    if (defined($range) && $count <  $start) { next; }
+ 		    $qresult.="$key=$value&";
+ 		}
+ 	    }
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    chop($qresult);
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting dump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting dump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
+ #  Store a set of key=value pairs associated with a versioned name.
+ #
+ #  Parameters:
+ #    $cmd                - Request command keyword.
+ #    $tail               - Tail of the request.  This is a colon
+ #                          separated list containing:
+ #                          domain/user - User and authentication domain.
+ #                          namespace   - Name of the database being modified
+ #                          rid         - Resource keyword to modify.
+ #                          what        - new value associated with rid.
+ #
+ #    $client             - Socket open on the client.
+ #
+ #
+ #  Returns:
+ #      1 (keep on processing).
+ #  Side-Effects:
+ #    Writes to the client
+ sub store_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
+     if ($namespace ne 'roles') {
+ 	chomp($what);
+ 	my @pairs=split(/\&/,$what);
+ 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
+ 				       &GDBM_WRCREAT(), "S",
+ 				       "$rid:$what");
+ 	if ($hashref) {
+ 	    my $now = time;
+ 	    my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
+ 	    my $key;
+ 	    $hashref->{"version:$rid"}++;
+ 	    my $version=$hashref->{"version:$rid"};
+ 	    my $allkeys='';
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+ 		$allkeys.=$key.':';
+ 		$hashref->{"$version:$rid:$key"}=$value;
+ 	    }
+ 	    $hashref->{"$version:$rid:timestamp"}=$now;
+ 	    $allkeys.='timestamp';
+ 	    $hashref->{"$version:keys:$rid"}=$allkeys;
+ 	    if (&untie_user_hash($hashref)) {
+ 		&Reply($client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 			"while attempting store\n", $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting store\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("store", \&store_handler, 0, 1, 0);
+ #  Modify a set of key=value pairs associated with a versioned name.
+ #
+ #  Parameters:
+ #    $cmd                - Request command keyword.
+ #    $tail               - Tail of the request.  This is a colon
+ #                          separated list containing:
+ #                          domain/user - User and authentication domain.
+ #                          namespace   - Name of the database being modified
+ #                          rid         - Resource keyword to modify.
+ #                          v           - Version item to modify
+ #                          what        - new value associated with rid.
+ #
+ #    $client             - Socket open on the client.
+ #
+ #
+ #  Returns:
+ #      1 (keep on processing).
+ #  Side-Effects:
+ #    Writes to the client
+ sub putstore_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
+     if ($namespace ne 'roles') {
+ 	chomp($what);
+ 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
+ 				       &GDBM_WRCREAT(), "M",
+ 				       "$rid:$v:$what");
+ 	if ($hashref) {
+ 	    my $now = time;
+ 	    my %data = &hash_extract($what);
+ 	    my @allkeys;
+ 	    while (my($key,$value) = each(%data)) {
+ 		push(@allkeys,$key);
+ 		$hashref->{"$v:$rid:$key"} = $value;
+ 	    }
+ 	    my $allkeys = join(':',@allkeys);
+ 	    $hashref->{"$v:keys:$rid"}=$allkeys;
+ 	    if (&untie_user_hash($hashref)) {
+ 		&Reply($client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 			"while attempting store\n", $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting store\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("putstore", \&putstore_handler, 0, 1, 0);
+ sub hash_extract {
+     my ($str)=@_;
+     my %hash;
+     foreach my $pair (split(/\&/,$str)) {
+ 	my ($key,$value)=split(/=/,$pair);
+ 	$hash{$key}=$value;
+     }
+     return (%hash);
+ }
+ sub hash_to_str {
+     my ($hash_ref)=@_;
+     my $str;
+     foreach my $key (keys(%$hash_ref)) {
+ 	$str.=$key.'='.$hash_ref->{$key}.'&';
+     }
+     $str=~s/\&$//;
+     return $str;
+ }
+ #
+ #  Dump out all versions of a resource that has key=value pairs associated
+ # with it for each version.  These resources are built up via the store
+ # command.
+ #
+ #  Parameters:
+ #     $cmd               - Command keyword.
+ #     $tail              - Remainder of the request which consists of:
+ #                          domain/user   - User and auth. domain.
+ #                          namespace     - name of resource database.
+ #                          rid           - Resource id.
+ #    $client             - socket open on the client.
+ #
+ # Returns:
+ #      1  indicating the caller should not yet exit.
+ # Side-effects:
+ #   Writes a reply to the client.
+ #   The reply is a string of the following shape:
+ #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
+ #    Where the 1 above represents version 1.
+ #    this continues for all pairs of keys in all versions.
+ #
+ #
+ #
+ #
+ sub restore_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
+     my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
+     $namespace=~s/\//\_/g;
+     $namespace = &LONCAPA::clean_username($namespace);
+     chomp($rid);
+     my $qresult='';
+     my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
+     if ($hashref) {
+ 	my $version=$hashref->{"version:$rid"};
+ 	$qresult.="version=$version&";
+ 	my $scope;
+ 	for ($scope=1;$scope<=$version;$scope++) {
+ 	    my $vkeys=$hashref->{"$scope:keys:$rid"};
+ 	    my @keys=split(/:/,$vkeys);
+ 	    my $key;
+ 	    $qresult.="$scope:keys=$vkeys&";
+ 	    foreach $key (@keys) {
+ 		$qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
+ 	    }
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply( $client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting restore\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting restore\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("restore", \&restore_handler, 0,1,0);
+ #
+ #   Add a chat message to a synchronous discussion board.
+ #
+ # Parameters:
+ #    $cmd                - Request keyword.
+ #    $tail               - Tail of the command. A colon separated list
+ #                          containing:
+ #                          cdom    - Domain on which the chat board lives
+ #                          cnum    - Course containing the chat board.
+ #                          newpost - Body of the posting.
+ #                          group   - Optional group, if chat board is only
+ #                                    accessible in a group within the course
+ #   $client              - Socket open on the client.
+ # Returns:
+ #   1    - Indicating caller should keep on processing.
+ #
+ # Side-effects:
+ #   writes a reply to the client.
+ #
+ #
+ sub send_chat_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
+     &chat_add($cdom,$cnum,$newpost,$group);
+     &Reply($client, "ok\n", $userinput);
+     return 1;
+ }
+ &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
+ #
+ #   Retrieve the set of chat messages from a discussion board.
+ #
+ #  Parameters:
+ #    $cmd             - Command keyword that initiated the request.
+ #    $tail            - Remainder of the request after the command
+ #                       keyword.  In this case a colon separated list of
+ #                       chat domain    - Which discussion board.
+ #                       chat id        - Discussion thread(?)
+ #                       domain/user    - Authentication domain and username
+ #                                        of the requesting person.
+ #                       group          - Optional course group containing
+ #                                        the board.
+ #   $client           - Socket open on the client program.
+ # Returns:
+ #    1     - continue processing
+ # Side effects:
+ #    Response is written to the client.
+ #
+ sub retrieve_chat_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
+     my $reply='';
+     foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
+ 	$reply.=&escape($_).':';
+     }
+     $reply=~s/\:$//;
+     &Reply($client, $reply."\n", $userinput);
+     return 1;
+ }
+ &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
+ #
+ #  Initiate a query of an sql database.  SQL query repsonses get put in
+ #  a file for later retrieval.  This prevents sql query results from
+ #  bottlenecking the system.  Note that with loncnew, perhaps this is
+ #  less of an issue since multiple outstanding requests can be concurrently
+ #  serviced.
+ #
+ #  Parameters:
+ #     $cmd       - COmmand keyword that initiated the request.
+ #     $tail      - Remainder of the command after the keyword.
+ #                  For this function, this consists of a query and
+ #                  3 arguments that are self-documentingly labelled
+ #                  in the original arg1, arg2, arg3.
+ #     $client    - Socket open on the client.
+ # Return:
+ #    1   - Indicating processing should continue.
+ # Side-effects:
+ #    a reply is written to $client.
+ #
+ sub send_query_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
+     $query=~s/\n*$//g;
+     &Reply($client, "". &sql_reply("$clientname\&$query".
+ 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
+ 	  $userinput);
+     return 1;
+ }
+ &register_handler("querysend", \&send_query_handler, 0, 1, 0);
+ #
+ #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
+ #   The query is submitted via a "querysend" transaction.
+ #   There it is passed on to the lonsql daemon, queued and issued to
+ #   mysql.
+ #     This transaction is invoked when the sql transaction is complete
+ #   it stores the query results in flie and indicates query completion.
+ #   presumably local software then fetches this response... I'm guessing
+ #   the sequence is: lonc does a querysend, we ask lonsql to do it.
+ #   lonsql on completion of the query interacts with the lond of our
+ #   client to do a query reply storing two files:
+ #    - id     - The results of the query.
+ #    - id.end - Indicating the transaction completed.
+ #    NOTE: id is a unique id assigned to the query and querysend time.
+ # Parameters:
+ #    $cmd        - Command keyword that initiated this request.
+ #    $tail       - Remainder of the tail.  In this case that's a colon
+ #                  separated list containing the query Id and the
+ #                  results of the query.
+ #    $client     - Socket open on the client.
+ # Return:
+ #    1           - Indicating that we should continue processing.
+ # Side effects:
+ #    ok written to the client.
+ #
+ sub reply_query_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($id,$reply)=split(/:/,$tail);
+     my $store;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new(">$execdir/tmp/$id")) {
+ 	$reply=~s/\&/\n/g;
+ 	print $store $reply;
+ 	close $store;
+ 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
+ 	print $store2 "done\n";
+ 	close $store2;
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)
+ 		." IO::File->new Failed ".
+ 		"while attempting queryreply\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
+ #
+ #  Process the courseidput request.  Not quite sure what this means
+ #  at the system level sense.  It appears a gdbm file in the
+ #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
+ #  a set of entries made in that database.
+ #
+ # Parameters:
+ #   $cmd      - The command keyword that initiated this request.
+ #   $tail     - Tail of the command.  In this case consists of a colon
+ #               separated list contaning the domain to apply this to and
+ #               an ampersand separated list of keyword=value pairs.
+ #               Each value is a colon separated list that includes:
+ #               description, institutional code and course owner.
+ #               For backward compatibility with versions included
+ #               in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
+ #               code and/or course owner are preserved from the existing
+ #               record when writing a new record in response to 1.1 or
+ #               1.2 implementations of lonnet::flushcourselogs().
+ #
+ #   $client   - Socket open on the client.
+ # Returns:
+ #   1    - indicating that processing should continue
+ #
+ # Side effects:
+ #   reply is written to the client.
+ #
+ sub put_course_id_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom, $what) = split(/:/, $tail,2);
+     chomp($what);
+     my $now=time;
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+ 	foreach my $pair (@pairs) {
+             my ($key,$courseinfo) = split(/=/,$pair,2);
+             $courseinfo =~ s/=/:/g;
+             my @current_items = split(/:/,$hashref->{$key},-1);
+             shift(@current_items); # remove description
+             pop(@current_items);   # remove last access
+             my $numcurrent = scalar(@current_items);
+             if ($numcurrent > 3) {
+                 $numcurrent = 3;
+             }
+             my @new_items = split(/:/,$courseinfo,-1);
+             my $numnew = scalar(@new_items);
+             if ($numcurrent > 0) {
+                 if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2
+                     for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
+                         $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
+                     }
+                 }
+             }
+ 	    $hashref->{$key}=$courseinfo.':'.$now;
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    &Reply( $client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)
+ 		     ." untie(GDBM) Failed ".
+ 		     "while attempting courseidput\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)
+ 		 ." tie(GDBM) Failed ".
+ 		 "while attempting courseidput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
+ #  Retrieves the value of a course id resource keyword pattern
+ #  defined since a starting date.  Both the starting date and the
+ #  keyword pattern are optional.  If the starting date is not supplied it
+ #  is treated as the beginning of time.  If the pattern is not found,
+ #  it is treatred as "." matching everything.
+ #
+ #  Parameters:
+ #     $cmd     - Command keyword that resulted in us being dispatched.
+ #     $tail    - The remainder of the command that, in this case, consists
+ #                of a colon separated list of:
+ #                 domain   - The domain in which the course database is
+ #                            defined.
+ #                 since    - Optional parameter describing the minimum
+ #                            time of definition(?) of the resources that
+ #                            will match the dump.
+ #                 description - regular expression that is used to filter
+ #                            the dump.  Only keywords matching this regexp
+ #                            will be used.
+ #                 institutional code - optional supplied code to filter
+ #                            the dump. Only courses with an institutional code
+ #                            that match the supplied code will be returned.
+ #                 owner    - optional supplied username and domain of owner to
+ #                            filter the dump.  Only courses for which the course
+ #                            owner matches the supplied username and/or domain
+ #                            will be returned. Pre-2.2.0 legacy entries from
+ #                            nohist_courseiddump will only contain usernames.
+ #     $client  - The socket open on the client.
+ # Returns:
+ #    1     - Continue processing.
+ # Side Effects:
+ #   a reply is written to $client.
+ sub dump_course_id_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
+         $typefilter,$regexp_ok) =split(/:/,$tail);
+     if (defined($description)) {
+ 	$description=&unescape($description);
+     } else {
+ 	$description='.';
+     }
+     if (defined($instcodefilter)) {
+         $instcodefilter=&unescape($instcodefilter);
+     } else {
+         $instcodefilter='.';
+     }
+     my ($ownerunamefilter,$ownerdomfilter);
+     if (defined($ownerfilter)) {
+         $ownerfilter=&unescape($ownerfilter);
+         if ($ownerfilter ne '.' && defined($ownerfilter)) {
+             if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
+                  $ownerunamefilter = $1;
+                  $ownerdomfilter = $2;
+             } else {
+                 $ownerunamefilter = $ownerfilter;
+                 $ownerdomfilter = '';
+             }
+         }
+     } else {
+         $ownerfilter='.';
+     }
+     if (defined($coursefilter)) {
+         $coursefilter=&unescape($coursefilter);
+     } else {
+         $coursefilter='.';
+     }
+     if (defined($typefilter)) {
+         $typefilter=&unescape($typefilter);
+     } else {
+         $typefilter='.';
+     }
+     if (defined($regexp_ok)) {
+         $regexp_ok=&unescape($regexp_ok);
+     }
+     unless (defined($since)) { $since=0; }
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+ 	while (my ($key,$value) = each(%$hashref)) {
+ 	    my ($descr,$lasttime,$inst_code,$owner,$type);
+             my @courseitems = split(/:/,$value);
+             $lasttime = pop(@courseitems);
+ 	    ($descr,$inst_code,$owner,$type)=@courseitems;
+ 	    if ($lasttime<$since) { next; }
+             my $match = 1;
+ 	    unless ($description eq '.') {
+ 		my $unescapeDescr = &unescape($descr);
+ 		unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
+                     $match = 0;
+ 		}
+             }
+             unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
+                 my $unescapeInstcode = &unescape($inst_code);
+                 if ($regexp_ok) {
+                     unless (eval('$unescapeInstcode=~/$instcodefilter/')) {
+                         $match = 0;
+                     }
+                 } else {
+                     unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
+                         $match = 0;
+                     }
+                 }
+ 	    }
+             unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
+                 my $unescapeOwner = &unescape($owner);
+                 if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
+                     if ($unescapeOwner =~ /:/) {
+                         if (eval('$unescapeOwner !~
+                              /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i')) {
+                             $match = 0;
+                         }
+                     } else {
+                         if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) {
+                             $match = 0;
+                         }
+                     }
+                 } elsif ($ownerunamefilter ne '') {
+                     if ($unescapeOwner =~ /:/) {
+                         if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E:[^:]+$/i')) {
+                              $match = 0;
+                         }
+                     } else {
+                         if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) {
+                             $match = 0;
+                         }
+                     }
+                 } elsif ($ownerdomfilter ne '') {
+                     if ($unescapeOwner =~ /:/) {
+                         if (eval('$unescapeOwner!~/^[^:]+:\Q$ownerdomfilter\E/')) {
+                              $match = 0;
+                         }
+                     } else {
+                         if ($ownerdomfilter ne $udom) {
+                             $match = 0;
+                         }
+                     }
+                 }
+             }
+             unless ($coursefilter eq '.' || !defined($coursefilter)) {
+                 my $unescapeCourse = &unescape($key);
+                 unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
+                     $match = 0;
+                 }
+             }
+             unless ($typefilter eq '.' || !defined($typefilter)) {
+                 my $unescapeType = &unescape($type);
+                 if ($type eq '') {
+                     if ($typefilter ne 'Course') {
+                         $match = 0;
+                     }
+                 } else {
+                     unless (eval('$unescapeType=~/^\Q$typefilter\E$/')) {
+                         $match = 0;
+                     }
+                 }
+             }
+             if ($match == 1) {
+                 $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
+             }
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    chop($qresult);
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting courseiddump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting courseiddump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
+ #
+ # Puts an unencrypted entry in a namespace db file at the domain level
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub put_domain_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$namespace,$what) =split(/:/,$tail,3);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
+                                    "P", $what);
+     if ($hashref) {
+         foreach my $pair (@pairs) {
+             my ($key,$value)=split(/=/,$pair);
+             $hashref->{$key}=$value;
+         }
+         if (&untie_domain_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                      "while attempting putdom\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting putdom\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
+ # Unencrypted get from the namespace database file at the domain level.
+ # This function retrieves a keyed item from a specific named database in the
+ # domain directory.
+ #
+ # Parameters:
+ #   $cmd             - Command request keyword (get).
+ #   $tail            - Tail of the command.  This is a colon separated list
+ #                      consisting of the domain and the 'namespace'
+ #                      which selects the gdbm file to do the lookup in,
+ #                      & separated list of keys to lookup.  Note that
+ #                      the values are returned as an & separated list too.
+ #   $client          - File descriptor open on the client.
+ # Returns:
+ #   1       - Continue processing.
+ #   0       - Exit.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub get_domain_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$client:$tail";
+     my ($udom,$namespace,$what)=split(/:/,$tail,3);
+     chomp($what);
+     my @queries=split(/\&/,$what);
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
+     if ($hashref) {
+         for (my $i=0;$i<=$#queries;$i++) {
+             $qresult.="$hashref->{$queries[$i]}&";
+         }
+         if (&untie_domain_hash($hashref)) {
+             $qresult=~s/\&$//;
+             &Reply($client, "$qresult\n", $userinput);
+         } else {
+             &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+                       "while attempting getdom\n",$userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                  "while attempting getdom\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
+ #
+ #  Puts an id to a domains id database.
+ #
+ #  Parameters:
+ #   $cmd     - The command that triggered us.
+ #   $tail    - Remainder of the request other than the command. This is a
+ #              colon separated list containing:
+ #              $domain  - The domain for which we are writing the id.
+ #              $pairs  - The id info to write... this is and & separated list
+ #                        of keyword=value.
+ #   $client  - Socket open on the client.
+ #  Returns:
+ #    1   - Continue processing.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub put_id_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
+ 				   "P", $what);
+     if ($hashref) {
+ 	foreach my $pair (@pairs) {
+ 	    my ($key,$value)=split(/=/,$pair);
+ 	    $hashref->{$key}=$value;
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting idput\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		  "while attempting idput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("idput", \&put_id_handler, 0, 1, 0);
+ #
+ #  Retrieves a set of id values from the id database.
+ #  Returns an & separated list of results, one for each requested id to the
+ #  client.
+ #
+ # Parameters:
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose id table we dump
+ #               ids      Consists of an & separated list of
+ #                        id keywords whose values will be fetched.
+ #                        nonexisting keywords will have an empty value.
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects:
+ #   An & separated list of results is written to $client.
+ #
+ sub get_id_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$client:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my @queries=split(/\&/,$what);
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
+     if ($hashref) {
+ 	for (my $i=0;$i<=$#queries;$i++) {
+ 	    $qresult.="$hashref->{$queries[$i]}&";
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply($client, "$qresult\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		      "while attempting idget\n",$userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting idget\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("idget", \&get_id_handler, 0, 1, 0);
+ #
+ # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose dcmail we are recording
+ #               email    Consists of key=value pair
+ #                        where key is unique msgid
+ #                        and value is message (in XML)
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply is written to $client.
+ #
+ sub put_dcmail_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
+     if ($hashref) {
+         my ($key,$value)=split(/=/,$what);
+         $hashref->{$key}=$value;
+     }
+     if (&untie_domain_hash($hashref)) {
+         &Reply($client, "ok\n", $userinput);
+     } else {
+         &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                  "while attempting dcmailput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
+ #
+ # Retrieves broadcast e-mail from nohist_dcmail database
+ # Returns to client an & separated list of key=value pairs,
+ # where key is msgid and value is message information.
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose dcmail table we dump
+ #               startfilter - beginning of time window
+ #               endfilter - end of time window
+ #               sendersfilter - & separated list of username:domain
+ #                 for senders to search for.
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply (& separated list of msgid=messageinfo pairs) is
+ #     written to $client.
+ #
+ sub dump_dcmail_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
+     chomp($sendersfilter);
+     my @senders = ();
+     if (defined($startfilter)) {
+         $startfilter=&unescape($startfilter);
+     } else {
+         $startfilter='.';
+     }
+     if (defined($endfilter)) {
+         $endfilter=&unescape($endfilter);
+     } else {
+         $endfilter='.';
+     }
+     if (defined($sendersfilter)) {
+         $sendersfilter=&unescape($sendersfilter);
+ 	@senders = map { &unescape($_) } split(/\&/,$sendersfilter);
+     }
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
+     if ($hashref) {
+         while (my ($key,$value) = each(%$hashref)) {
+             my $match = 1;
+             my ($timestamp,$subj,$uname,$udom) =
+ 		split(/:/,&unescape(&unescape($key)),5); # yes, twice really
+             $subj = &unescape($subj);
+             unless ($startfilter eq '.' || !defined($startfilter)) {
+                 if ($timestamp < $startfilter) {
+                     $match = 0;
+                 }
+             }
+             unless ($endfilter eq '.' || !defined($endfilter)) {
+                 if ($timestamp > $endfilter) {
+                     $match = 0;
+                 }
+             }
+             unless (@senders < 1) {
+                 unless (grep/^$uname:$udom$/,@senders) {
+                     $match = 0;
+                 }
+             }
+             if ($match == 1) {
+                 $qresult.=$key.'='.$value.'&';
+             }
+         }
+         if (&untie_domain_hash($hashref)) {
+             chop($qresult);
+             &Reply($client, "$qresult\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                     "while attempting dcmaildump\n", $userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting dcmaildump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
+ #
+ # Puts domain roles in nohist_domainroles database
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose roles we are recording
+ #               role -   Consists of key=value pair
+ #                        where key is unique role
+ #                        and value is start/end date information
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply is written to $client.
+ #
+ sub put_domainroles_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
+     if ($hashref) {
+         foreach my $pair (@pairs) {
+             my ($key,$value)=split(/=/,$pair);
+             $hashref->{$key}=$value;
+         }
+         if (&untie_domain_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                      "while attempting domroleput\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting domroleput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
+ #
+ # Retrieves domain roles from nohist_domainroles database
+ # Returns to client an & separated list of key=value pairs,
+ # where key is role and value is start and end date information.
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose domain roles table we dump
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply (& separated list of role=start/end info pairs) is
+ #     written to $client.
+ #
+ sub dump_domainroles_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
+     chomp($rolesfilter);
+     my @roles = ();
+     if (defined($startfilter)) {
+         $startfilter=&unescape($startfilter);
+     } else {
+         $startfilter='.';
+     }
+     if (defined($endfilter)) {
+         $endfilter=&unescape($endfilter);
+     } else {
+         $endfilter='.';
+     }
+     if (defined($rolesfilter)) {
+         $rolesfilter=&unescape($rolesfilter);
+ 	@roles = split(/\&/,$rolesfilter);
+     }
+     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
+     if ($hashref) {
+         my $qresult = '';
+         while (my ($key,$value) = each(%$hashref)) {
+             my $match = 1;
+             my ($start,$end) = split(/:/,&unescape($value));
+             my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
+             unless ($startfilter eq '.' || !defined($startfilter)) {
+                 if ($start >= $startfilter) {
+                     $match = 0;
+                 }
+             }
+             unless ($endfilter eq '.' || !defined($endfilter)) {
+                 if ($end <= $endfilter) {
+                     $match = 0;
+                 }
+             }
+             unless (@roles < 1) {
+                 unless (grep/^$trole$/,@roles) {
+                     $match = 0;
+                 }
+             }
+             if ($match == 1) {
+                 $qresult.=$key.'='.$value.'&';
+             }
+         }
+         if (&untie_domain_hash($hashref)) {
+             chop($qresult);
+             &Reply($client, "$qresult\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                     "while attempting domrolesdump\n", $userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting domrolesdump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
+ #  Process the tmpput command I'm not sure what this does.. Seems to
+ #  create a file in the lonDaemons/tmp directory of the form $id.tmp
+ # where Id is the client's ip concatenated with a sequence number.
+ # The file will contain some value that is passed in.  Is this e.g.
+ # a login token?
+ #
+ # Parameters:
+ #    $cmd     - The command that got us dispatched.
+ #    $tail    - The remainder of the request following $cmd:
+ #               In this case this will be the contents of the file.
+ #    $client  - Socket connected to the client.
+ # Returns:
+ #    1 indicating processing can continue.
+ # Side effects:
+ #   A file is created in the local filesystem.
+ #   A reply is sent to the client.
+ sub tmp_put_handler {
+     my ($cmd, $what, $client) = @_;
+     my $userinput = "$cmd:$what";	# Reconstruct for logging.
+     my ($record,$context) = split(/:/,$what);
+     if ($context ne '') {
+         chomp($context);
+         $context = &unescape($context);
+     }
+     my ($id,$store);
+     $tmpsnum++;
+     if ($context eq 'resetpw') {
+         $id = &md5_hex(&md5_hex(time.{}.rand().$$));
+     } else {
+         $id = $$.'_'.$clientip.'_'.$tmpsnum;
+     }
+     $id=~s/\W/\_/g;
+     $record=~s/\n//g;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
+ 	print $store $record;
+ 	close $store;
+ 	&Reply($client, "$id\n", $userinput);
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
+ 		  "while attempting tmpput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
+ #   Processes the tmpget command.  This command returns the contents
+ #  of a temporary resource file(?) created via tmpput.
+ #
+ # Paramters:
+ #    $cmd      - Command that got us dispatched.
+ #    $id       - Tail of the command, contain the id of the resource
+ #                we want to fetch.
+ #    $client   - socket open on the client.
+ # Return:
+ #    1         - Inidcating processing can continue.
+ # Side effects:
+ #   A reply is sent to the client.
+ #
+ sub tmp_get_handler {
+     my ($cmd, $id, $client) = @_;
+     my $userinput = "$cmd:$id";
+     $id=~s/\W/\_/g;
+     my $store;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
+ 	my $reply=<$store>;
+ 	&Reply( $client, "$reply\n", $userinput);
+ 	close $store;
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
+ 		  "while attempting tmpget\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
+ #
+ #  Process the tmpdel command.  This command deletes a temp resource
+ #  created by the tmpput command.
+ #
+ # Parameters:
+ #   $cmd      - Command that got us here.
+ #   $id       - Id of the temporary resource created.
+ #   $client   - socket open on the client process.
+ #
+ # Returns:
+ #   1     - Indicating processing should continue.
+ # Side Effects:
+ #   A file is deleted
+ #   A reply is sent to the client.
+ sub tmp_del_handler {
+     my ($cmd, $id, $client) = @_;
+     my $userinput= "$cmd:$id";
+     chomp($id);
+     $id=~s/\W/\_/g;
+     my $execdir=$perlvar{'lonDaemons'};
+     if (unlink("$execdir/tmp/$id.tmp")) {
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
+ 		  "while attempting tmpdel\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
+ #
+ #   Processes the setannounce command.  This command
+ #   creates a file named announce.txt in the top directory of
+ #   the documentn root and sets its contents.  The announce.txt file is
+ #   printed in its entirety at the LonCAPA login page.  Note:
+ #   once the announcement.txt fileis created it cannot be deleted.
+ #   However, setting the contents of the file to empty removes the
+ #   announcement from the login page of loncapa so who cares.
+ #
+ # Parameters:
+ #    $cmd          - The command that got us dispatched.
+ #    $announcement - The text of the announcement.
+ #    $client       - Socket open on the client process.
+ # Retunrns:
+ #   1             - Indicating request processing should continue
+ # Side Effects:
+ #   The file {DocRoot}/announcement.txt is created.
+ #   A reply is sent to $client.
+ #
+ sub set_announce_handler {
+     my ($cmd, $announcement, $client) = @_;
+     my $userinput    = "$cmd:$announcement";
+     chomp($announcement);
+     $announcement=&unescape($announcement);
+     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
+ 				'/announcement.txt')) {
+ 	print $store $announcement;
+ 	close $store;
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)."\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
+ #
+ #  Return the version of the daemon.  This can be used to determine
+ #  the compatibility of cross version installations or, alternatively to
+ #  simply know who's out of date and who isn't.  Note that the version
+ #  is returned concatenated with the tail.
+ # Parameters:
+ #   $cmd        - the request that dispatched to us.
+ #   $tail       - Tail of the request (client's version?).
+ #   $client     - Socket open on the client.
+ #Returns:
+ #   1 - continue processing requests.
+ # Side Effects:
+ #   Replies with version to $client.
+ sub get_version_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = $cmd.$tail;
+     &Reply($client, &version($userinput)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("version", \&get_version_handler, 0, 1, 0);
+ #  Set the current host and domain.  This is used to support
+ #  multihomed systems.  Each IP of the system, or even separate daemons
+ #  on the same IP can be treated as handling a separate lonCAPA virtual
+ #  machine.  This command selects the virtual lonCAPA.  The client always
+ #  knows the right one since it is lonc and it is selecting the domain/system
+ #  from the hosts.tab file.
+ # Parameters:
+ #    $cmd      - Command that dispatched us.
+ #    $tail     - Tail of the command (domain/host requested).
+ #    $socket   - Socket open on the client.
+ #
+ # Returns:
+ #     1   - Indicates the program should continue to process requests.
+ # Side-effects:
+ #     The default domain/system context is modified for this daemon.
+ #     a reply is sent to the client.
+ #
+ sub set_virtual_host_handler {
+     my ($cmd, $tail, $socket) = @_;
+     my $userinput  ="$cmd:$tail";
+     &Reply($client, &sethost($userinput)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
+ #  Process a request to exit:
+ #   - "bye" is sent to the client.
+ #   - The client socket is shutdown and closed.
+ #   - We indicate to the caller that we should exit.
+ # Formal Parameters:
+ #   $cmd                - The command that got us here.
+ #   $tail               - Tail of the command (empty).
+ #   $client             - Socket open on the tail.
+ # Returns:
+ #   0      - Indicating the program should exit!!
+ #
+ sub exit_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     &logthis("Client $clientip ($clientname) hanging up: $userinput");
+     &Reply($client, "bye\n", $userinput);
+     $client->shutdown(2);        # shutdown the socket forcibly.
+     $client->close();
+     return 0;
+ }
+ &register_handler("exit", \&exit_handler, 0,1,1);
+ &register_handler("init", \&exit_handler, 0,1,1);
+ &register_handler("quit", \&exit_handler, 0,1,1);
+ #  Determine if auto-enrollment is enabled.
+ #  Note that the original had what I believe to be a defect.
+ #  The original returned 0 if the requestor was not a registerd client.
+ #  It should return "refused".
+ # Formal Parameters:
+ #   $cmd       - The command that invoked us.
+ #   $tail      - The tail of the command (Extra command parameters.
+ #   $client    - The socket open on the client that issued the request.
+ # Returns:
+ #    1         - Indicating processing should continue.
+ #
+ sub enrollment_enabled_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = $cmd.":".$tail; # For logging purposes.
+     my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
+     my $outcome  = &localenroll::run($cdom);
+     &Reply($client, "$outcome\n", $userinput);
+     return 1;
+ }
+ &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
+ #   Get the official sections for which auto-enrollment is possible.
+ #   Since the admin people won't know about 'unofficial sections'
+ #   we cannot auto-enroll on them.
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched here.
+ #    $tail    - The remainder of the request.  In our case this
+ #               will be split into:
+ #               $coursecode   - The course name from the admin point of view.
+ #               $cdom         - The course's domain(?).
+ #    $client  - Socket open on the client.
+ # Returns:
+ #    1    - Indiciting processing should continue.
+ #
+ sub get_sections_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($coursecode, $cdom) = split(/:/, $tail);
+     my @secs = &localenroll::get_sections($coursecode,$cdom);
+     my $seclist = &escape(join(':',@secs));
+     &Reply($client, "$seclist\n", $userinput);
+     return 1;
+ }
+ &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
+ #   Validate the owner of a new course section.
+ #
+ # Formal Parameters:
+ #   $cmd      - Command that got us dispatched.
+ #   $tail     - the remainder of the command.  For us this consists of a
+ #               colon separated string containing:
+ #                  $inst    - Course Id from the institutions point of view.
+ #                  $owner   - Proposed owner of the course.
+ #                  $cdom    - Domain of the course (from the institutions
+ #                             point of view?)..
+ #   $client   - Socket open on the client.
+ #
+ # Returns:
+ #   1        - Processing should continue.
+ #
+ sub validate_course_owner_handler {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
+     $owner = &unescape($owner);
+     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
+     &Reply($client, "$outcome\n", $userinput);
+     return 1;
+ }
+ &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
+ #
+ #   Validate a course section in the official schedule of classes
+ #   from the institutions point of view (part of autoenrollment).
+ #
+ # Formal Parameters:
+ #   $cmd          - The command request that got us dispatched.
+ #   $tail         - The tail of the command.  In this case,
+ #                   this is a colon separated set of words that will be split
+ #                   into:
+ #                        $inst_course_id - The course/section id from the
+ #                                          institutions point of view.
+ #                        $cdom           - The domain from the institutions
+ #                                          point of view.
+ #   $client       - Socket open on the client.
+ # Returns:
+ #    1           - Indicating processing should continue.
+ #
+ sub validate_course_section_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_course_id, $cdom) = split(/:/, $tail);
+     my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
+     &Reply($client, "$outcome\n", $userinput);
+     return 1;
+ }
+ &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
+ #
+ #   Validate course owner's access to enrollment data for specific class section.
+ #
+ #
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - The tail of the command.   In this case this is a colon separated
+ #               set of words that will be split into:
+ #               $inst_class  - Institutional code for the specific class section
+ #               $courseowner - The escaped username:domain of the course owner
+ #               $cdom        - The domain of the course from the institution's
+ #                              point of view.
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ #
+ sub validate_class_access_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_class,$courseowner,$cdom) = split(/:/, $tail);
+     $courseowner = &unescape($courseowner);
+     my $outcome;
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$outcome=&localenroll::check_section($inst_class,$courseowner,$cdom);
+     };
+     &Reply($client,"$outcome\n", $userinput);
+     return 1;
+ }
+ &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
+ #
+ #   Create a password for a new LON-CAPA user added by auto-enrollment.
+ #   Only used for case where authentication method for new user is localauth
+ #
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - The tail of the command.   In this case this is a colon separated
+ #               set of words that will be split into:
+ #               $authparam - An authentication parameter (localauth parameter).
+ #               $cdom      - The domain of the course from the institution's
+ #                            point of view.
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ #
+ sub create_auto_enroll_password_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($authparam, $cdom) = split(/:/, $userinput);
+     my ($create_passwd,$authchk);
+     ($authparam,
+      $create_passwd,
+      $authchk) = &localenroll::create_password($authparam,$cdom);
+     &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
+ 	   $userinput);
+     return 1;
+ }
+ &register_handler("autocreatepassword", \&create_auto_enroll_password_handler,
+, 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 = &Apache::lonnet::hash2str(%codes);
+ 	my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
+ 	my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
+ 	my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
+ 	&Reply($client,
+ 	       $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
+ 	       .$cat_order_str."\n",
+ 	       $userinput);
+     } else {
+ 	# this else branch added by RF since if not ok, lonc will
+ 	# hang waiting on reply until timeout.
+ 	#
+ 	&Reply($client, "format_error\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("autoinstcodeformat",
+ 		  \&get_institutional_code_format_handler,0,1,0);
+ sub get_institutional_defaults_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = $tail;
+     my %defaults_hash;
+     my @code_order;
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
+                                                    \@code_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             while (my ($key,$value) = each(%defaults_hash)) {
+                 $result.=&escape($key).'='.&escape($value).'&';
+             }
+             $result .= 'code_order='.&escape(join('&',@code_order));
+             &Reply($client,$result."\n",$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("autoinstcodedefaults",
+                   \&get_institutional_defaults_handler,0,1,0);
+ # Get domain specific conditions for import of student photographs to a course
+ #
+ # Retrieves information from photo_permission subroutine in localenroll.
+ # Returns outcome (ok) if no processing errors, and whether course owner is
+ # required to accept conditions of use (yes/no).
+ #
+ #
+ sub photo_permission_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $cdom = $tail;
+     my ($perm_reqd,$conditions);
+     my $outcome;
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
+ 						  \$conditions);
+     };
+     if (!$@) {
+ 	&Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
+ 	       $userinput);
+     } else {
+ 	&Failure($client,"unknown_cmd\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
+ #
+ # Checks if student photo is available for a user in the domain, in the user's
+ # directory (in /userfiles/internal/studentphoto.jpg).
+ # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
+ # the student's photo.
+ sub photo_check_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my ($udom,$uname,$pid) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $uname = &unescape($uname);
+     $pid = &unescape($pid);
+     my $path=&propath($udom,$uname).'/userfiles/internal/';
+     if (!-e $path) {
+         &mkpath($path);
+     }
+     my $response;
+     my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
+     $result .= ':'.$response;
+     &Reply($client, &escape($result)."\n",$userinput);
+     return 1;
+ }
+ &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
+ #
+ # Retrieve information from localenroll about whether to provide a button
+ # for users who have enbled import of student photos to initiate an
+ # update of photo files for registered students. Also include
+ # comment to display alongside button.
+ sub photo_choice_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput             = "$cmd:$tail";
+     my $cdom                  = &unescape($tail);
+     my ($update,$comment);
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	($update,$comment)    = &localenroll::manager_photo_update($cdom);
+     };
+     if (!$@) {
+ 	&Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
+     } else {
+ 	&Failure($client,"unknown_cmd\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autophotochoice",\&photo_choice_handler,0,1,0);
+ #
+ # Gets a student's photo to exist (in the correct image type) in the user's
+ # directory.
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - A colon separated set of words that will be split into:
+ #               $domain - student's domain
+ #               $uname  - student username
+ #               $type   - image type desired
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ sub student_photo_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($domain,$uname,$ext,$type) = split(/:/, $tail);
+     my $path=&propath($domain,$uname). '/userfiles/internal/';
+     my $filename = 'studentphoto.'.$ext;
+     if ($type eq 'thumbnail') {
+         $filename = 'studentphoto_tn.'.$ext;
+     }
+     if (-e $path.$filename) {
+ 	&Reply($client,"ok\n","$cmd:$tail");
+ 	return 1;
+     }
+     &mkpath($path);
+     my $file;
+     if ($type eq 'thumbnail') {
+ 	eval {
+ 	    local($SIG{__DIE__})='DEFAULT';
+ 	    $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
+ 	};
+     } else {
+         $file=&localstudentphoto::fetch($domain,$uname);
+     }
+     if (!$file) {
+ 	&Failure($client,"unavailable\n","$cmd:$tail");
+ 	return 1;
+     }
+     if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
+     if (-e $path.$filename) {
+ 	&Reply($client,"ok\n","$cmd:$tail");
+ 	return 1;
+     }
+     &Failure($client,"unable_to_convert\n","$cmd:$tail");
+     return 1;
+ }
+ &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
+ sub inst_usertypes_handler {
+     my ($cmd, $domain, $client) = @_;
+     my $res;
+     my $userinput = $cmd.":".$domain; # For logging purposes.
+     my (%typeshash,@order,$result);
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
+     };
+     if ($result eq 'ok') {
+         if (keys(%typeshash) > 0) {
+             foreach my $key (keys(%typeshash)) {
+                 $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
+             }
+         }
+         $res=~s/\&$//;
+         $res .= ':';
+         if (@order > 0) {
+             foreach my $item (@order) {
+                 $res .= &escape($item).'&';
+             }
+         }
+         $res=~s/\&$//;
+     }
+     &Reply($client, "$res\n", $userinput);
+     return 1;
+ }
+ &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
+ # mkpath makes all directories for a file, expects an absolute path with a
+ # file or a trailing / if just a dir is passed
+ # returns 1 on success 0 on failure
+ sub mkpath {
+     my ($file)=@_;
+     my @parts=split(/\//,$file,-1);
+     my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
+     for (my $i=3;$i<= ($#parts-1);$i++) {
+ 	$now.='/'.$parts[$i];
+ 	if (!-e $now) {
+ 	    if  (!mkdir($now,0770)) { return 0; }
+ 	}
+     }
+     return 1;
+ }
+ #---------------------------------------------------------------
+ #
+ #   Getting, decoding and dispatching requests:
+ #
+ #
+ #   Get a Request:
+ #   Gets a Request message from the client.  The transaction
+ #   is defined as a 'line' of text.  We remove the new line
+ #   from the text line.
+ #
+ sub get_request {
+     my $input = <$client>;
+     chomp($input);
+     &Debug("get_request: Request = $input\n");
+     &status('Processing '.$clientname.':'.$input);
+     return $input;
+ }
+ #---------------------------------------------------------------
+ #
+ #  Process a request.  This sub should shrink as each action
+ #  gets farmed out into a separat sub that is registered
+ #  with the dispatch hash.
+ #
+ # Parameters:
+ #    user_input   - The request received from the client (lonc).
+ # Returns:
+ #    true to keep processing, false if caller should exit.
+ #
+ sub process_request {
+     my ($userinput) = @_;      # Easier for now to break style than to
+                                 # fix all the userinput -> user_input.
+     my $wasenc    = 0;		# True if request was encrypted.
+ # ------------------------------------------------------------ See if encrypted
+     # for command
+     # sethost:<server>
+     # <command>:<args>
+     #   we just send it to the processor
+     # for
+     # sethost:<server>:<command>:<args>
+     #  we do the implict set host and then do the command
+     if ($userinput =~ /^sethost:/) {
+ 	(my $cmd,my $newid,$userinput) = split(':',$userinput,3);
+ 	if (defined($userinput)) {
+ 	    &sethost("$cmd:$newid");
+ 	} else {
+ 	    $userinput = "$cmd:$newid";
+ 	}
+     }
+     if ($userinput =~ /^enc/) {
+ 	$userinput = decipher($userinput);
+ 	$wasenc=1;
+ 	if(!$userinput) {	# Cipher not defined.
+ 	    &Failure($client, "error: Encrypted data without negotated key\n");
+ 	    return 0;
+ 	}
+     }
+     Debug("process_request: $userinput\n");
+     #
+     #   The 'correct way' to add a command to lond is now to
+     #   write a sub to execute it and Add it to the command dispatch
+     #   hash via a call to register_handler..  The comments to that
+     #   sub should give you enough to go on to show how to do this
+     #   along with the examples that are building up as this code
+     #   is getting refactored.   Until all branches of the
+     #   if/elseif monster below have been factored out into
+     #   separate procesor subs, if the dispatch hash is missing
+     #   the command keyword, we will fall through to the remainder
+     #   of the if/else chain below in order to keep this thing in
+     #   working order throughout the transmogrification.
+     my ($command, $tail) = split(/:/, $userinput, 2);
+     chomp($command);
+     chomp($tail);
+     $tail =~ s/(\r)//;		# This helps people debugging with e.g. telnet.
+     $command =~ s/(\r)//;	# And this too for parameterless commands.
+     if(!$tail) {
+ 	$tail ="";		# defined but blank.
+     }
+     &Debug("Command received: $command, encoded = $wasenc");
+     if(defined $Dispatcher{$command}) {
+ 	my $dispatch_info = $Dispatcher{$command};
+ 	my $handler       = $$dispatch_info[0];
+ 	my $need_encode   = $$dispatch_info[1];
+ 	my $client_types  = $$dispatch_info[2];
+ 	Debug("Matched dispatch hash: mustencode: $need_encode "
+ 	      ."ClientType $client_types");
+ 	#  Validate the request:
+ 	my $ok = 1;
+ 	my $requesterprivs = 0;
+ 	if(&isClient()) {
+ 	    $requesterprivs |= $CLIENT_OK;
+ 	}
+ 	if(&isManager()) {
+ 	    $requesterprivs |= $MANAGER_OK;
+ 	}
+ 	if($need_encode && (!$wasenc)) {
+ 	    Debug("Must encode but wasn't: $need_encode $wasenc");
+ 	    $ok = 0;
+ 	}
+ 	if(($client_types & $requesterprivs) == 0) {
+ 	    Debug("Client not privileged to do this operation");
+ 	    $ok = 0;
+ 	}
+ 	if($ok) {
+ 	    Debug("Dispatching to handler $command $tail");
+ 	    my $keep_going = &$handler($command, $tail, $client);
+ 	    return $keep_going;
+ 	} else {
+ 	    Debug("Refusing to dispatch because client did not match requirements");
+ 	    Failure($client, "refused\n", $userinput);
+ 	    return 1;
+ 	}
+     }
+     print $client "unknown_cmd\n";
+ # -------------------------------------------------------------------- complete
+     Debug("process_request - returning 1");
+     return 1;
+ }
+ #
+ #   Decipher encoded traffic
+ #  Parameters:
+ #     input      - Encoded data.
+ #  Returns:
+ #     Decoded data or undef if encryption key was not yet negotiated.
+ #  Implicit input:
+ #     cipher  - This global holds the negotiated encryption key.
+ #
+ sub decipher {
+     my ($input)  = @_;
+     my $output = '';
+     if($cipher) {
+ 	my($enc, $enclength, $encinput) = split(/:/, $input);
+ 	for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
+ 	    $output .=
+ 		$cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
+ 	}
+ 	return substr($output, 0, $enclength);
+     } else {
+ 	return undef;
+     }
+ }
+ #
+ #   Register a command processor.  This function is invoked to register a sub
+ #   to process a request.  Once registered, the ProcessRequest sub can automatically
+ #   dispatch requests to an appropriate sub, and do the top level validity checking
+ #   as well:
+ #    - Is the keyword recognized.
+ #    - Is the proper client type attempting the request.
+ #    - Is the request encrypted if it has to be.
+ #   Parameters:
+ #    $request_name         - Name of the request being registered.
+ #                           This is the command request that will match
+ #                           against the hash keywords to lookup the information
+ #                           associated with the dispatch information.
+ #    $procedure           - Reference to a sub to call to process the request.
+ #                           All subs get called as follows:
+ #                             Procedure($cmd, $tail, $replyfd, $key)
+ #                             $cmd    - the actual keyword that invoked us.
+ #                             $tail   - the tail of the request that invoked us.
+ #                             $replyfd- File descriptor connected to the client
+ #    $must_encode          - True if the request must be encoded to be good.
+ #    $client_ok            - True if it's ok for a client to request this.
+ #    $manager_ok           - True if it's ok for a manager to request this.
+ # Side effects:
+ #      - On success, the Dispatcher hash has an entry added for the key $RequestName
+ #      - On failure, the program will die as it's a bad internal bug to try to
+ #        register a duplicate command handler.
+ #
+ sub register_handler {
+     my ($request_name,$procedure,$must_encode,	$client_ok,$manager_ok)   = @_;
+     #  Don't allow duplication#
+     if (defined $Dispatcher{$request_name}) {
+ 	die "Attempting to define a duplicate request handler for $request_name\n";
+     }
+     #   Build the client type mask:
+     my $client_type_mask = 0;
+     if($client_ok) {
+ 	$client_type_mask  |= $CLIENT_OK;
+     }
+     if($manager_ok) {
+ 	$client_type_mask  |= $MANAGER_OK;
+     }
+     #  Enter the hash:
+     my @entry = ($procedure, $must_encode, $client_type_mask);
+     $Dispatcher{$request_name} = \@entry;
+ }
+ #------------------------------------------------------------------
  #
  #  Convert an error return code from lcpasswd to a string value.
  #
- Line 749  sub catchexception {
+ Line 4906  sub catchexception {
      $SIG{'QUIT'}='DEFAULT';
      $SIG{__DIE__}='DEFAULT';
      &status("Catching exception");
-     &logthis("<font color=red>CRITICAL: "
+     &logthis("<font color='red'>CRITICAL: "
       ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
       ."a crash with this error msg->[$error]</font>");
      &logthis('Famous last words: '.$status.' - '.$lastlog);
- Line 757  sub catchexception {
+ Line 4914  sub catchexception {
      $server->close();
      die($error);
  }
  sub timeout {
      &status("Handling Timeout");
-     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
+     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
      &catchexception('Timeout');
  }
  # -------------------------------- Set signal handlers to record abnormal exits
  $SIG{'QUIT'}=\&catchexception;
  $SIG{__DIE__}=\&catchexception;
- Line 843  sub HUNTSMAN {                      # si
+ Line 5000  sub HUNTSMAN {                      # si
      &logthis("Free socket: ".shutdown($server,2)); # free up socket
      my $execdir=$perlvar{'lonDaemons'};
      unlink("$execdir/logs/lond.pid");
-     &logthis("<font color=red>CRITICAL: Shutting down</font>");
+     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
      &status("Done killing children");
      exit;                           # clean up with dignity
  }
- Line 853  sub HUPSMAN {                      # sig
+ Line 5010  sub HUPSMAN {                      # sig
      &status("Killing children for restart (HUP)");
      kill 'INT' => keys %children;
      &logthis("Free socket: ".shutdown($server,2)); # free up socket
-     &logthis("<font color=red>CRITICAL: Restarting</font>");
+     &logthis("<font color='red'>CRITICAL: Restarting</font>");
      my $execdir=$perlvar{'lonDaemons'};
      unlink("$execdir/logs/lond.pid");
      &status("Restarting self (HUP)");
- Line 861  sub HUPSMAN {                      # sig
+ Line 5018  sub HUPSMAN {                      # sig
  }
  #
- #    Kill off hashes that describe the host table prior to re-reading it.
- #    Hashes affected are:
- #       %hostid, %hostdom %hostip
- #
- sub KillHostHashes {
-     foreach my $key (keys %hostid) {
- 	delete $hostid{$key};
-     }
-     foreach my $key (keys %hostdom) {
- 	delete $hostdom{$key};
-     }
-     foreach my $key (keys %hostip) {
- 	delete $hostip{$key};
-     }
- }
- #
- #   Read in the host table from file and distribute it into the various hashes:
- #
- #    - %hostid  -  Indexed by IP, the loncapa hostname.
- #    - %hostdom -  Indexed by  loncapa hostname, the domain.
- #    - %hostip  -  Indexed by hostid, the Ip address of the host.
- sub ReadHostTable {
-     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
-     while (my $configline=<CONFIG>) {
- 	if (!($configline =~ /^\s*\#/)) {
- 	    my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
- 	    chomp($ip); $ip=~s/\D+$//;
- 	    $hostid{$ip}=$id;
- 	    $hostdom{$id}=$domain;
- 	    $hostip{$id}=$ip;
- 	    if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
- 	}
-     }
-     close(CONFIG);
- }
- #
  #  Reload the Apache daemon's state.
  #  This is done by invoking /home/httpd/perl/apachereload
  #  a setuid perl script that can be root for us to do this job.
- Line 929  sub UpdateHosts {
+ Line 5048  sub UpdateHosts {
      #  either dropped or changed hosts.  Note that the re-read of the table
      #  will take care of new and changed hosts as connections come into being.
+     #FIXME need a way to tell lonnet that it needs to reset host
+     #cached host info
-     KillHostHashes;
+     foreach my $child (keys(%children)) {
-     ReadHostTable;
-     foreach my $child (keys %children) {
  	my $childip = $children{$child};
- 	if(!$hostid{$childip}) {
+ 	if (defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
  	    logthis('<font color="blue"> UpdateHosts killing child '
  		    ." $child for ip $childip </font>");
  	    kill('INT', $child);
- Line 956  sub checkchildren {
+ Line 5074  sub checkchildren {
      &logthis('Going to check on the children');
      my $docdir=$perlvar{'lonDocRoot'};
      foreach (sort keys %children) {
- 	sleep 1;
+ 	#sleep 1;
          unless (kill 'USR1' => $_) {
  	    &logthis ('Child '.$_.' is dead');
              &logstatus($$.' is dead');
+ 	    delete($children{$_});
          }
      }
      sleep 5;
-     $SIG{ALRM} = sub { die "timeout" };
+     $SIG{ALRM} = sub { Debug("timeout");
+ 		       die "timeout";  };
      $SIG{__DIE__} = 'DEFAULT';
      &status("Checking on the children (waiting for reports)");
      foreach (sort keys %children) {
- Line 977  sub checkchildren {
+ Line 5097  sub checkchildren {
  	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
  	    #$execdir=$perlvar{'lonDaemons'};
  	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
+ 	    delete($children{$_});
  	    alarm(0);
  	  }
          }
- Line 984  sub checkchildren {
+ Line 5105  sub checkchildren {
      $SIG{ALRM} = 'DEFAULT';
      $SIG{__DIE__} = \&catchexception;
      &status("Finished checking children");
+     &logthis('Finished Checking children');
  }
  # --------------------------------------------------------------------- Logging
- Line 1015  sub Debug {
+ Line 5137  sub Debug {
  #     request - Original request from client.
  #
  sub Reply {
-     my $fd      = shift;
+     my ($fd, $reply, $request) = @_;
-     my $reply   = shift;
-     my $request = shift;
      print $fd $reply;
      Debug("Request was $request  Reply was $reply");
+     $Transactions++;
+ }
+ #
+ #    Sub to report a failure.
+ #    This function:
+ #     -   Increments the failure statistic counters.
+ #     -   Invokes Reply to send the error message to the client.
+ # Parameters:
+ #    fd       - File descriptor open on the client
+ #    reply    - Reply text to emit.
+ #    request  - The original request message (used by Reply
+ #               to debug if that's enabled.
+ # Implicit outputs:
+ #    $Failures- The number of failures is incremented.
+ #    Reply (invoked here) sends a message to the
+ #    client:
+ #
+ sub Failure {
+     my $fd      = shift;
+     my $reply   = shift;
+     my $request = shift;
+     $Failures++;
+     Reply($fd, $reply, $request);      # That's simple eh?
  }
  # ------------------------------------------------------------------ Log status
- Line 1029  sub logstatus {
+ Line 5174  sub logstatus {
      &status("Doing logging");
      my $docdir=$perlvar{'lonDocRoot'};
      {
-     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
-     print $fh $$."\t".$clientname."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
-     $fh->close();
-     }
-     &status("Finished londstatus.txt");
-     {
  	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
-         print $fh $status."\n".$lastlog."\n".time;
+         print $fh $status."\n".$lastlog."\n".time."\n$keymode";
          $fh->close();
      }
+     &status("Finished $$.txt");
+     {
+ 	open(LOG,">>$docdir/lon-status/londstatus.txt");
+ 	flock(LOG,LOCK_EX);
+ 	print LOG $$."\t".$clientname."\t".$currenthostid."\t"
+ 	    .$status."\t".$lastlog."\t $keymode\n";
+ 	flock(LOG,LOCK_UN);
+ 	close(LOG);
+     }
      &status("Finished logging");
  }
- Line 1065  sub status {
+ Line 5213  sub status {
      $0='lond: '.$what.' '.$local;
  }
- # -------------------------------------------------------- Escape Special Chars
- sub escape {
-     my $str=shift;
-     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
-     return $str;
- }
- # ----------------------------------------------------- Un-Escape Special Chars
- sub unescape {
-     my $str=shift;
-     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
-     return $str;
- }
- # ----------------------------------------------------------- Send USR1 to lonc
- sub reconlonc {
-     my $peerfile=shift;
-     &logthis("Trying to reconnect for $peerfile");
-     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
-     if (my $fh=IO::File->new("$loncfile")) {
- 	my $loncpid=<$fh>;
-         chomp($loncpid);
-         if (kill 0 => $loncpid) {
- 	    &logthis("lonc at pid $loncpid responding, sending USR1");
-             kill USR1 => $loncpid;
-         } else {
- 	    &logthis(
-               "<font color=red>CRITICAL: "
-              ."lonc at pid $loncpid not responding, giving up</font>");
-         }
-     } else {
-       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
-     }
- }
- # -------------------------------------------------- Non-critical communication
- sub subreply {
-     my ($cmd,$server)=@_;
-     my $peerfile="$perlvar{'lonSockDir'}/$server";
-     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
-                                       Type    => SOCK_STREAM,
-                                       Timeout => 10)
-        or return "con_lost";
-     print $sclient "$cmd\n";
-     my $answer=<$sclient>;
-     chomp($answer);
-     if (!$answer) { $answer="con_lost"; }
-     return $answer;
- }
- sub reply {
-   my ($cmd,$server)=@_;
-   my $answer;
-   if ($server ne $currenthostid) {
-     $answer=subreply($cmd,$server);
-     if ($answer eq 'con_lost') {
- 	$answer=subreply("ping",$server);
-         if ($answer ne $server) {
- 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
-            &reconlonc("$perlvar{'lonSockDir'}/$server");
-         }
-         $answer=subreply($cmd,$server);
-     }
-   } else {
-     $answer='self_reply';
-   }
-   return $answer;
- }
  # -------------------------------------------------------------- Talk to lonsql
- 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 1155  sub subsqlreply {
+ Line 5230  sub subsqlreply {
                                        Type    => SOCK_STREAM,
                                        Timeout => 10)
         or return "con_lost";
-     print $sclient "$cmd\n";
+     print $sclient "$cmd:$currentdomainid\n";
      my $answer=<$sclient>;
      chomp($answer);
      if (!$answer) { $answer="con_lost"; }
      return $answer;
  }
- # -------------------------------------------- Return path to profile directory
- sub propath {
-     my ($udom,$uname)=@_;
-     $udom=~s/\W//g;
-     $uname=~s/\W//g;
-     my $subdir=$uname.'__';
-     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
-     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
-     return $proname;
- }
  # --------------------------------------- Is this the home server of an author?
  sub ishome {
- Line 1203  my $execdir=$perlvar{'lonDaemons'};
+ Line 5266  my $execdir=$perlvar{'lonDaemons'};
  open (PIDSAVE,">$execdir/logs/lond.pid");
  print PIDSAVE "$$\n";
  close(PIDSAVE);
- &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
+ &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
  &status('Starting');
- Line 1218  $SIG{USR1} = \&checkchildren;
+ Line 5281  $SIG{USR1} = \&checkchildren;
  $SIG{USR2} = \&UpdateHosts;
  #  Read the host hashes:
+ &Apache::lonnet::load_hosts_tab();
- ReadHostTable;
+ my $dist=`$perlvar{'lonDaemons'}/distprobe`;
  # --------------------------------------------------------------
  #   Accept connections.  When a connection comes in, it is validated
- Line 1236  while (1) {
+ Line 5300  while (1) {
  sub make_new_child {
      my $pid;
-     my $cipher;
+ #    my $cipher;     # Now global
      my $sigset;
      $client = shift;
- Line 1265  sub make_new_child {
+ Line 5329  sub make_new_child {
  	&logthis("Unable to determine who caller was, getpeername returned nothing");
      }
      if (defined($iaddr)) {
- 	$clientip=inet_ntoa($iaddr);
+ 	$clientip  = inet_ntoa($iaddr);
+ 	Debug("Connected with $clientip");
      } else {
- 	&logthis("Unable to determine clinetip");
+ 	&logthis("Unable to determine clientip");
  	$clientip='Unavailable';
      }
- Line 1292  sub make_new_child {
+ Line 5357  sub make_new_child {
          sigprocmask(SIG_UNBLOCK, $sigset)
              or die "Can't unblock SIGINT for fork: $!\n";
-         my $tmpsnum=0;
+ #        my $tmpsnum=0;            # Now global
  #---------------------------------------------------- kerberos 5 initialization
          &Authen::Krb5::init_context();
-         &Authen::Krb5::init_ets();
+ 	unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||
+ 		($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
+ 	    &Authen::Krb5::init_ets();
+ 	}
  	&status('Accepted connection');
  # =============================================================================
              # do something with the connection
  # -----------------------------------------------------------------------------
- 	# see if we know client and check for spoof IP by challenge
+ 	# see if we know client and 'check' for spoof IP by ineffective challenge
  	ReadManagerTable;	# May also be a manager!!
- 	my $clientrec=($hostid{$clientip}     ne undef);
+ 	my $outsideip=$clientip;
- 	my $ismanager=($managers{$clientip}    ne undef);
+ 	if ($clientip eq '127.0.0.1') {
+ 	    $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
+ 	}
+ 	my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
+ 	my $ismanager=($managers{$outsideip}    ne undef);
  	$clientname  = "[unknonwn]";
  	if($clientrec) {	# Establish client type.
  	    $ConnectionType = "client";
- 	    $clientname = $hostid{$clientip};
+ 	    $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
  	    if($ismanager) {
  		$ConnectionType = "both";
  	    }
  	} else {
  	    $ConnectionType = "manager";
- 	    $clientname = $managers{$clientip};
+ 	    $clientname = $managers{$outsideip};
  	}
  	my $clientok;
  	if ($clientrec || $ismanager) {
  	    &status("Waiting for init from $clientip $clientname");
  	    &logthis('<font color="yellow">INFO: Connection, '.
- Line 1326  sub make_new_child {
+ Line 5400  sub make_new_child {
  		  " ($clientname) connection type = $ConnectionType </font>" );
  	    &status("Connecting $clientip  ($clientname))");
  	    my $remotereq=<$client>;
- 	    $remotereq=~s/[^\w:]//g;
+ 	    chomp($remotereq);
+ 	    Debug("Got init: $remotereq");
  	    if ($remotereq =~ /^init/) {
  		&sethost("sethost:$perlvar{'lonHostID'}");
- 		my $challenge="$$".time;
+ 		#
- 		print $client "$challenge\n";
+ 		#  If the remote is attempting a local init... give that a try:
- 		&status(
+ 		#
- 			"Waiting for challenge reply from $clientip ($clientname)");
+ 		my ($i, $inittype) = split(/:/, $remotereq);
- 		$remotereq=<$client>;
- 		$remotereq=~s/\W//g;
+ 		# If the connection type is ssl, but I didn't get my
- 		if ($challenge eq $remotereq) {
+ 		# certificate files yet, then I'll drop  back to
- 		    $clientok=1;
+ 		# insecure (if allowed).
- 		    print $client "ok\n";
+ 		if($inittype eq "ssl") {
+ 		    my ($ca, $cert) = lonssl::CertificateFile;
+ 		    my $kfile       = lonssl::KeyFile;
+ 		    if((!$ca)   ||
+ 		       (!$cert) ||
+ 		       (!$kfile)) {
+ 			$inittype = ""; # This forces insecure attempt.
+ 			&logthis("<font color=\"blue\"> Certificates not "
+ 				 ."installed -- trying insecure auth</font>");
+ 		    } else {	# SSL certificates are in place so
+ 		    }		# Leave the inittype alone.
+ 		}
+ 		if($inittype eq "local") {
+ 		    my $key = LocalConnection($client, $remotereq);
+ 		    if($key) {
+ 			Debug("Got local key $key");
+ 			$clientok     = 1;
+ 			my $cipherkey = pack("H32", $key);
+ 			$cipher       = new IDEA($cipherkey);
+ 			print $client "ok:local\n";
+ 			&logthis('<font color="green"'
+ 				 . "Successful local authentication </font>");
+ 			$keymode = "local"
+ 		    } else {
+ 			Debug("Failed to get local key");
+ 			$clientok = 0;
+ 			shutdown($client, 3);
+ 			close $client;
+ 		    }
+ 		} elsif ($inittype eq "ssl") {
+ 		    my $key = SSLConnection($client);
+ 		    if ($key) {
+ 			$clientok = 1;
+ 			my $cipherkey = pack("H32", $key);
+ 			$cipher       = new IDEA($cipherkey);
+ 			&logthis('<font color="green">'
+ 				 ."Successfull ssl authentication with $clientname </font>");
+ 			$keymode = "ssl";
+ 		    } else {
+ 			$clientok = 0;
+ 			close $client;
+ 		    }
  		} else {
- 		    &logthis(
+ 		    my $ok = InsecureConnection($client);
- 			     "<font color=blue>WARNING: $clientip did not reply challenge</font>");
+ 		    if($ok) {
- 		    &status('No challenge reply '.$clientip);
+ 			$clientok = 1;
+ 			&logthis('<font color="green">'
+ 				 ."Successful insecure authentication with $clientname </font>");
+ 			print $client "ok\n";
+ 			$keymode = "insecure";
+ 		    } else {
+ 			&logthis('<font color="yellow">'
+ 				  ."Attempted insecure connection disallowed </font>");
+ 			close $client;
+ 			$clientok = 0;
+ 		    }
  		}
  	    } else {
  		&logthis(
- 			 "<font color=blue>WARNING: "
+ 			 "<font color='blue'>WARNING: "
  			 ."$clientip failed to initialize: >$remotereq< </font>");
  		&status('No init '.$clientip);
  	    }
  	} else {
  	    &logthis(
- 		     "<font color=blue>WARNING: Unknown client $clientip</font>");
+ 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
  	    &status('Hung up on '.$clientip);
  	}
  	if ($clientok) {
  # ---------------- New known client connecting, could mean machine online again
+ 	    if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip
- 	    foreach my $id (keys(%hostip)) {
+ 		&& $clientip ne '127.0.0.1') {
- 		if ($hostip{$id} ne $clientip ||
+ 		&Apache::lonnet::reconlonc();
- 		    $hostip{$currenthostid} eq $clientip) {
- 		    # no need to try to do recon's to myself
- 		    next;
- 		}
- 		&reconlonc("$perlvar{'lonSockDir'}/$id");
  	    }
- 	    &logthis("<font color=green>Established connection: $clientname</font>");
+ 	    &logthis("<font color='green'>Established connection: $clientname</font>");
  	    &status('Will listen to '.$clientname);
  # ------------------------------------------------------------ Process requests
- 	    while (my $userinput=<$client>) {
+ 	    my $keep_going = 1;
-                 chomp($userinput);
+ 	    my $user_input;
- 		Debug("Request = $userinput\n");
+ 	    while(($user_input = get_request) && $keep_going) {
-                 &status('Processing '.$clientname.': '.$userinput);
+ 		alarm(120);
-                 my $wasenc=0;
+ 		Debug("Main: Got $user_input\n");
-                 alarm(120);
+ 		$keep_going = &process_request($user_input);
- # ------------------------------------------------------------ See if encrypted
- 		if ($userinput =~ /^enc/) {
- 		    if ($cipher) {
- 			my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
- 			$userinput='';
- 			for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
- 			    $userinput.=
- 				$cipher->decrypt(
- 						 pack("H16",substr($encinput,$encidx,16))
- 						 );
- 			}
- 			$userinput=substr($userinput,0,$cmdlength);
- 			$wasenc=1;
- 		    }
- 		}
- # ------------------------------------------------------------- Normal commands
- # ------------------------------------------------------------------------ ping
- 		if ($userinput =~ /^ping/) {	# client only
- 		    if(isClient) {
- 			print $client "$currenthostid\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ pong
- 		}elsif ($userinput =~ /^pong/) { # client only
- 		    if(isClient) {
- 			my $reply=&reply("ping",$clientname);
- 			print $client "$currenthostid:$reply\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ ekey
- 		} elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
- 		    my $buildkey=time.$$.int(rand 100000);
- 		    $buildkey=~tr/1-6/A-F/;
- 		    $buildkey=int(rand 100000).$buildkey.int(rand 100000);
- 		    my $key=$currenthostid.$clientname;
- 		    $key=~tr/a-z/A-Z/;
- 		    $key=~tr/G-P/0-9/;
- 		    $key=~tr/Q-Z/0-9/;
- 		    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
- 		    $key=substr($key,0,32);
- 		    my $cipherkey=pack("H32",$key);
- 		    $cipher=new IDEA $cipherkey;
- 		    print $client "$buildkey\n";
- # ------------------------------------------------------------------------ load
- 		} elsif ($userinput =~ /^load/) { # client only
- 		    if (isClient) {
- 			my $loadavg;
- 			{
- 			    my $loadfile=IO::File->new('/proc/loadavg');
- 			    $loadavg=<$loadfile>;
- 			}
- 			$loadavg =~ s/\s.*//g;
- 			my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
- 			print $client "$loadpercent\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- userload
- 		} elsif ($userinput =~ /^userload/) { # client only
- 		    if(isClient) {
- 			my $userloadpercent=&userload();
- 			print $client "$userloadpercent\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- #
- #        Transactions requiring encryption:
- #
- # ----------------------------------------------------------------- currentauth
- 		} elsif ($userinput =~ /^currentauth/) {
- 		    if (($wasenc==1)  && isClient) { # Encoded & client only.
- 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
- 			my $result = GetAuthType($udom, $uname);
- 			if($result eq "nouser") {
- 			    print $client "unknown_user\n";
- 			}
- 			else {
- 			    print $client "$result\n"
- 			    }
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- #--------------------------------------------------------------------- pushfile
- 		} elsif($userinput =~ /^pushfile/) {	# encoded & manager.
- 		    if(($wasenc == 1) && isManager) {
- 			my $cert = GetCertificate($userinput);
- 			if(ValidManager($cert)) {
- 			    my $reply = PushFile($userinput);
- 			    print $client "$reply\n";
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- #--------------------------------------------------------------------- reinit
- 		} elsif($userinput =~ /^reinit/) { # Encoded and manager
- 			if (($wasenc == 1) && isManager) {
- 				my $cert = GetCertificate($userinput);
- 				if(ValidManager($cert)) {
- 					chomp($userinput);
- 					my $reply = ReinitProcess($userinput);
- 					print $client  "$reply\n";
- 				} else {
- 					 print $client "refused\n";
- 				}
- 			} else {
- 				Reply($client, "refused\n", $userinput);
- 			}
- #------------------------------------------------------------------------- edit
- 		    } elsif ($userinput =~ /^edit/) {    # encoded and manager:
- 			if(($wasenc ==1) && (isManager)) {
- 			    my $cert = GetCertificate($userinput);
- 			    if(ValidManager($cert)) {
-                my($command, $filetype, $script) = split(/:/, $userinput);
-                if (($filetype eq "hosts") || ($filetype eq "domain")) {
-                   if($script ne "") {
- 		      Reply($client, EditFile($userinput));
-                   } else {
-                      Reply($client,"refused\n",$userinput);
-                   }
-                } else {
-                   Reply($client,"refused\n",$userinput);
-                }
-             } else {
-                Reply($client,"refused\n",$userinput);
-             }
-          } else {
- 	     Reply($client,"refused\n",$userinput);
- 	 }
- # ------------------------------------------------------------------------ auth
- 		    } elsif ($userinput =~ /^auth/) { # Encoded and client only.
- 		    if (($wasenc==1) && isClient) {
- 			my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
- 			chomp($upass);
- 			$upass=unescape($upass);
- 			my $proname=propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			if (-e $passfilename) {
- 			    my $pf = IO::File->new($passfilename);
- 			    my $realpasswd=<$pf>;
- 			    chomp($realpasswd);
- 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
- 			    my $pwdcorrect=0;
- 			    if ($howpwd eq 'internal') {
- 				&Debug("Internal auth");
- 				$pwdcorrect=
- 				    (crypt($upass,$contentpwd) eq $contentpwd);
- 			    } elsif ($howpwd eq 'unix') {
- 				&Debug("Unix auth");
- 				if((getpwnam($uname))[1] eq "") { #no such user!
- 				    $pwdcorrect = 0;
- 				} else {
- 				    $contentpwd=(getpwnam($uname))[1];
- 				    my $pwauth_path="/usr/local/sbin/pwauth";
- 				    unless ($contentpwd eq 'x') {
- 					$pwdcorrect=
- 					    (crypt($upass,$contentpwd) eq
- 					     $contentpwd);
- 				    }
- 				    elsif (-e $pwauth_path) {
- 					open PWAUTH, "|$pwauth_path" or
- 					    die "Cannot invoke authentication";
- 					print PWAUTH "$uname\n$upass\n";
- 					close PWAUTH;
- 					$pwdcorrect=!$?;
- 				    }
- 				}
- 			    } elsif ($howpwd eq 'krb4') {
- 				my $null=pack("C",0);
- 				unless ($upass=~/$null/) {
- 				    my $krb4_error = &Authen::Krb4::get_pw_in_tkt
- 					($uname,"",$contentpwd,'krbtgt',
- 					 $contentpwd,1,$upass);
- 				    if (!$krb4_error) {
- 					$pwdcorrect = 1;
- 				    } else {
- 					$pwdcorrect=0;
- 					# log error if it is not a bad password
- 					if ($krb4_error != 62) {
- 					    &logthis('krb4:'.$uname.','.$contentpwd.','.
- 						     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
- 					}
- 				    }
- 				}
- 			    } elsif ($howpwd eq 'krb5') {
- 				my $null=pack("C",0);
- 				unless ($upass=~/$null/) {
- 				    my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
- 				    my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
- 				    my $krbserver=&Authen::Krb5::parse_name($krbservice);
- 				    my $credentials=&Authen::Krb5::cc_default();
- 				    $credentials->initialize($krbclient);
- 				    my $krbreturn =
- 					&Authen::Krb5::get_in_tkt_with_password(
- 										$krbclient,$krbserver,$upass,$credentials);
- #				  unless ($krbreturn) {
- #				      &logthis("Krb5 Error: ".
- #					       &Authen::Krb5::error());
- #				  }
- 				    $pwdcorrect = ($krbreturn == 1);
- 				} else { $pwdcorrect=0; }
- 			    } elsif ($howpwd eq 'localauth') {
- 				$pwdcorrect=&localauth::localauth($uname,$upass,
- 								  $contentpwd);
- 			    }
- 			    if ($pwdcorrect) {
- 				print $client "authorized\n";
- 			    } else {
- 				print $client "non_authorized\n";
- 			    }
- 			} else {
- 			    print $client "unknown_user\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- passwd
- 		} elsif ($userinput =~ /^passwd/) { # encoded and client
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
- 			chomp($npass);
- 			$upass=&unescape($upass);
- 			$npass=&unescape($npass);
- 			&Debug("Trying to change password for $uname");
- 			my $proname=propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			if (-e $passfilename) {
- 			    my $realpasswd;
- 			    { my $pf = IO::File->new($passfilename);
- 			      $realpasswd=<$pf>; }
- 			    chomp($realpasswd);
- 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
- 			    if ($howpwd eq 'internal') {
- 				&Debug("internal auth");
- 				if (crypt($upass,$contentpwd) eq $contentpwd) {
- 				    my $salt=time;
- 				    $salt=substr($salt,6,2);
- 				    my $ncpass=crypt($npass,$salt);
- 				    {
- 					my $pf;
- 					if ($pf = IO::File->new(">$passfilename")) {
- 					    print $pf "internal:$ncpass\n";
- 					    &logthis("Result of password change for $uname: pwchange_success");
- 					    print $client "ok\n";
- 					} else {
- 					    &logthis("Unable to open $uname passwd to change password");
- 					    print $client "non_authorized\n";
- 					}
- 				    }
- 				} else {
- 				    print $client "non_authorized\n";
- 				}
- 			    } elsif ($howpwd eq 'unix') {
- 				# Unix means we have to access /etc/password
- 				# one way or another.
- 				# First: Make sure the current password is
- 				#        correct
- 				&Debug("auth is unix");
- 				$contentpwd=(getpwnam($uname))[1];
- 				my $pwdcorrect = "0";
- 				my $pwauth_path="/usr/local/sbin/pwauth";
- 				unless ($contentpwd eq 'x') {
- 				    $pwdcorrect=
- 					(crypt($upass,$contentpwd) eq $contentpwd);
- 				} elsif (-e $pwauth_path) {
- 				    open PWAUTH, "|$pwauth_path" or
- 					die "Cannot invoke authentication";
- 				    print PWAUTH "$uname\n$upass\n";
- 				    close PWAUTH;
- 				    &Debug("exited pwauth with $? ($uname,$upass) ");
- 				    $pwdcorrect=($? == 0);
- 				}
- 				if ($pwdcorrect) {
- 				    my $execdir=$perlvar{'lonDaemons'};
- 				    &Debug("Opening lcpasswd pipeline");
- 				    my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
- 				    print $pf "$uname\n$npass\n$npass\n";
- 				    close $pf;
- 				    my $err = $?;
- 				    my $result = ($err>0 ? 'pwchange_failure'
- 						  : 'ok');
- 				    &logthis("Result of password change for $uname: ".
- 					     &lcpasswdstrerror($?));
- 				    print $client "$result\n";
- 				} else {
- 				    print $client "non_authorized\n";
- 				}
- 			    } else {
- 				print $client "auth_mode_error\n";
- 			    }
- 			} else {
- 			    print $client "unknown_user\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- makeuser
- 		} elsif ($userinput =~ /^makeuser/) { # encoded and client.
- 		    &Debug("Make user received");
- 		    my $oldumask=umask(0077);
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
- 			&Debug("cmd =".$cmd." $udom =".$udom.
- 			       " uname=".$uname);
- 			chomp($npass);
- 			$npass=&unescape($npass);
- 			my $proname=propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			&Debug("Password file created will be:".
- 			       $passfilename);
- 			if (-e $passfilename) {
- 			    print $client "already_exists\n";
- 			} elsif ($udom ne $currentdomainid) {
- 			    print $client "not_right_domain\n";
- 			} else {
- 			    my @fpparts=split(/\//,$proname);
- 			    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
- 			    my $fperror='';
- 			    for (my $i=3;$i<=$#fpparts;$i++) {
- 				$fpnow.='/'.$fpparts[$i];
- 				unless (-e $fpnow) {
- 				    unless (mkdir($fpnow,0777)) {
- 					$fperror="error: ".($!+0)
- 					    ." mkdir failed while attempting "
- 					    ."makeuser";
- 				    }
- 				}
- 			    }
- 			    unless ($fperror) {
- 				my $result=&make_passwd_file($uname, $umode,$npass,
- 							     $passfilename);
- 				print $client $result;
- 			    } else {
- 				print $client "$fperror\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- 		    umask($oldumask);
- # -------------------------------------------------------------- changeuserauth
- 		} elsif ($userinput =~ /^changeuserauth/) { # encoded & client
- 		    &Debug("Changing authorization");
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
- 			chomp($npass);
- 			&Debug("cmd = ".$cmd." domain= ".$udom.
- 			       "uname =".$uname." umode= ".$umode);
- 			$npass=&unescape($npass);
- 			my $proname=&propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			if ($udom ne $currentdomainid) {
- 			    print $client "not_right_domain\n";
- 			} else {
- 			    my $result=&make_passwd_file($uname, $umode,$npass,
- 							 $passfilename);
- 			    print $client $result;
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ home
- 		} elsif ($userinput =~ /^home/) { # client clear or encoded
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
- 			chomp($uname);
- 			my $proname=propath($udom,$uname);
- 			if (-e $proname) {
- 			    print $client "found\n";
- 			} else {
- 			    print $client "not_found\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- update
- 		} elsif ($userinput =~ /^update/) { # client clear or encoded.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my $ownership=ishome($fname);
- 			if ($ownership eq 'not_owner') {
- 			    if (-e $fname) {
- 				my ($dev,$ino,$mode,$nlink,
- 				    $uid,$gid,$rdev,$size,
- 				    $atime,$mtime,$ctime,
- 				    $blksize,$blocks)=stat($fname);
- 				my $now=time;
- 				my $since=$now-$atime;
- 				if ($since>$perlvar{'lonExpire'}) {
- 				    my $reply=
- 					&reply("unsub:$fname","$clientname");
- 				    unlink("$fname");
- 				} else {
- 				    my $transname="$fname.in.transfer";
- 				    my $remoteurl=
- 					&reply("sub:$fname","$clientname");
- 				    my $response;
- 				    {
- 					my $ua=new LWP::UserAgent;
- 					my $request=new HTTP::Request('GET',"$remoteurl");
- 					$response=$ua->request($request,$transname);
- 				    }
- 				    if ($response->is_error()) {
- 					unlink($transname);
- 					my $message=$response->status_line;
- 					&logthis(
- 						 "LWP GET: $message for $fname ($remoteurl)");
- 				    } else {
- 					if ($remoteurl!~/\.meta$/) {
- 					    my $ua=new LWP::UserAgent;
- 					    my $mrequest=
- 						new HTTP::Request('GET',$remoteurl.'.meta');
- 					    my $mresponse=
- 						$ua->request($mrequest,$fname.'.meta');
- 					    if ($mresponse->is_error()) {
- 						unlink($fname.'.meta');
- 					    }
- 					}
- 					rename($transname,$fname);
- 				    }
- 				}
- 				print $client "ok\n";
- 			    } else {
- 				print $client "not_found\n";
- 			    }
- 			} else {
- 			    print $client "rejected\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------- fetch a user file from a remote server
- 		} elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
- 			my $udir=propath($udom,$uname).'/userfiles';
- 			unless (-e $udir) { mkdir($udir,0770); }
- 			if (-e $udir) {
-                             $ufile=~s/^[\.\~]+//;
-                             my $path = $udir;
-                             if ($ufile =~m|(.+)/([^/]+)$|) {
-                                 my @parts=split('/',$1);
-                                 foreach my $part (@parts) {
-                                     $path .= '/'.$part;
-                                     if ((-e $path)!=1) {
-                                         mkdir($path,0770);
-                                     }
-                                 }
-                             }
- 			    my $destname=$udir.'/'.$ufile;
- 			    my $transname=$udir.'/'.$ufile.'.in.transit';
- 			    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
- 			    my $response;
- 			    {
- 				my $ua=new LWP::UserAgent;
- 				my $request=new HTTP::Request('GET',"$remoteurl");
- 				$response=$ua->request($request,$transname);
- 			    }
- 			    if ($response->is_error()) {
- 				unlink($transname);
- 				my $message=$response->status_line;
- 				&logthis("LWP GET: $message for $fname ($remoteurl)");
- 				print $client "failed\n";
- 			    } else {
- 				if (!rename($transname,$destname)) {
- 				    &logthis("Unable to move $transname to $destname");
- 				    unlink($transname);
- 				    print $client "failed\n";
- 				} else {
- 				    print $client "ok\n";
- 				}
- 			    }
- 			} else {
- 			    print $client "not_home\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------ authenticate access to a user file
- 		} elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
- 		    if(isClient) {
- 			my ($cmd,$fname,$session)=split(/:/,$userinput);
- 			chomp($session);
- 			my $reply='non_auth';
- 			if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
- 				 $session.'.id')) {
- 			    while (my $line=<ENVIN>) {
- 				if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
- 			    }
- 			    close(ENVIN);
- 			    print $client $reply."\n";
- 			} else {
- 			    print $client "invalid_token\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- unsubscribe
- 		} elsif ($userinput =~ /^unsub/) {
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			if (-e $fname) {
- 			    print $client &unsub($client,$fname,$clientip);
- 			} else {
- 			    print $client "not_found\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------- subscribe
- 		} elsif ($userinput =~ /^sub/) {
- 		    if(isClient) {
- 			print $client &subscribe($userinput,$clientip);
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------- current version
- 		} elsif ($userinput =~ /^currentversion/) {
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			print $client &currentversion($fname)."\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- log
- 		} elsif ($userinput =~ /^log/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			my $proname=propath($udom,$uname);
- 			my $now=time;
- 			{
- 			    my $hfh;
- 			    if ($hfh=IO::File->new(">>$proname/activity.log")) {
- 				print $hfh "$now:$clientname:$what\n";
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." IO::File->new Failed "
- 				    ."while attempting log\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- put
- 		} elsif ($userinput =~ /^put/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if ($namespace ne 'roles') {
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    unless ($namespace=~/^nohist\_/) {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) { print $hfh "P:$now:$what\n"; }
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',
- 				    "$proname/$namespace.db",
- 				    &GDBM_WRCREAT(),0640)) {
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
- 				    $hash{$key}=$value;
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) failed ".
- 					"while attempting put\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting put\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------- inc
- 		} elsif ($userinput =~ /^inc:/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if ($namespace ne 'roles') {
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    unless ($namespace=~/^nohist\_/) {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) { print $hfh "P:$now:$what\n"; }
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',
- 				    "$proname/$namespace.db",
- 				    &GDBM_WRCREAT(),0640)) {
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
-                                     # We could check that we have a number...
-                                     if (! defined($value) || $value eq '') {
-                                         $value = 1;
-                                     }
- 				    $hash{$key}+=$value;
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) failed ".
- 					"while attempting 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 $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) {
- 				    print $hfh "P:$now:$exedom:$exeuser:$what\n";
- 				}
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
- 				    &ManagePermissions($key, $udom, $uname,
- 						       &GetAuthType( $udom,
- 								     $uname));
- 				    $hash{$key}=$value;
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) Failed ".
- 					"while attempting rolesput\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting rolesput\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- rolesdel
- 		} elsif ($userinput =~ /^rolesdel/) {
- 		    if(isClient) {
- 			&Debug("rolesdel");
- 			if ($wasenc==1) {
- 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
- 				=split(/:/,$userinput);
- 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
- 				   "user = ".$exeuser." udom=".$udom.
- 				   "what = ".$what);
- 			    my $namespace='roles';
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) {
- 				    print $hfh "D:$now:$exedom:$exeuser:$what\n";
- 				}
- 			    }
- 			    my @rolekeys=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 				foreach my $key (@rolekeys) {
- 				    delete $hash{$key};
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) Failed ".
- 					"while attempting rolesdel\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting rolesdel\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- get
- 		} elsif ($userinput =~ /^get/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($what);
- 			my @queries=split(/\&/,$what);
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    for (my $i=0;$i<=$#queries;$i++) {
- 				$qresult.="$hash{$queries[$i]}&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting get\n";
- 			    }
- 			} else {
- 			    if ($!+0 == 2) {
- 				print $client "error:No such file or ".
- 				    "GDBM reported bad block error\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting get\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ eget
- 		} elsif ($userinput =~ /^eget/) {
- 		    if (isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($what);
- 			my @queries=split(/\&/,$what);
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    for (my $i=0;$i<=$#queries;$i++) {
- 				$qresult.="$hash{$queries[$i]}&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				if ($cipher) {
- 				    my $cmdlength=length($qresult);
- 				    $qresult.="         ";
- 				    my $encqresult='';
- 				    for
- 					(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
- 					    $encqresult.=
- 						unpack("H16",
- 						       $cipher->encrypt(substr($qresult,$encidx,8)));
- 					}
- 				    print $client "enc:$cmdlength:$encqresult\n";
- 				} else {
- 				    print $client "error:no_key\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting eget\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting eget\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- del
- 		} elsif ($userinput =~ /^del/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($what);
- 			my $proname=propath($udom,$uname);
- 			my $now=time;
- 			unless ($namespace=~/^nohist\_/) {
- 			    my $hfh;
- 			    if (
- 				$hfh=IO::File->new(">>$proname/$namespace.hist")
- 				) { print $hfh "D:$now:$what\n"; }
- 			}
- 			my @keys=split(/\&/,$what);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 			    foreach my $key (@keys) {
- 				delete($hash{$key});
- 			    }
- 			    if (untie(%hash)) {
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting del\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting del\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ keys
- 		} elsif ($userinput =~ /^keys/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    foreach my $key (keys %hash) {
- 				$qresult.="$key&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting keys\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting keys\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- dumpcurrent
- 		} elsif ($userinput =~ /^currentdump/) {
- 		    if (isClient) {
- 			my ($cmd,$udom,$uname,$namespace)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			my $qresult='';
- 			my $proname=propath($udom,$uname);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',
- 				"$proname/$namespace.db",
- 				&GDBM_READER(),0640)) {
- 			    # Structure of %data:
- 			    # $data{$symb}->{$parameter}=$value;
- 			    # $data{$symb}->{'v.'.$parameter}=$version;
- 			    # since $parameter will be unescaped, we do not
- 			    # have to worry about silly parameter names...
- 			    my %data = ();
- 			    while (my ($key,$value) = each(%hash)) {
- 				my ($v,$symb,$param) = split(/:/,$key);
- 				next if ($v eq 'version' || $symb eq 'keys');
- 				next if (exists($data{$symb}) &&
- 					 exists($data{$symb}->{$param}) &&
- 					 $data{$symb}->{'v.'.$param} > $v);
- 				$data{$symb}->{$param}=$value;
- 				$data{$symb}->{'v.'.$param}=$v;
- 			    }
- 			    if (untie(%hash)) {
- 				while (my ($symb,$param_hash) = each(%data)) {
- 				    while(my ($param,$value) = each (%$param_hash)){
- 					next if ($param =~ /^v\./);
- 					$qresult.=$symb.':'.$param.'='.$value.'&';
- 				    }
- 				}
- 				chop($qresult);
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting currentdump\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting currentdump\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ dump
- 		} elsif ($userinput =~ /^dump/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$regexp)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if (defined($regexp)) {
- 			    $regexp=&unescape($regexp);
- 			} else {
- 			    $regexp='.';
- 			}
- 			my $qresult='';
- 			my $proname=propath($udom,$uname);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			       while (my ($key,$value) = each(%hash)) {
- 				   if ($regexp eq '.') {
- 				       $qresult.=$key.'='.$value.'&';
- 				   } else {
- 				       my $unescapeKey = &unescape($key);
- 				       if (eval('$unescapeKey=~/$regexp/')) {
- 					   $qresult.="$key=$value&";
- 				       }
- 				   }
- 			       }
- 			       if (untie(%hash)) {
- 				   chop($qresult);
- 				   print $client "$qresult\n";
- 			       } else {
- 				   print $client "error: ".($!+0)
- 				       ." untie(GDBM) Failed ".
-                                        "while attempting dump\n";
- 			       }
- 			   } else {
- 			       print $client "error: ".($!+0)
- 				   ." tie(GDBM) Failed ".
- 				   "while attempting dump\n";
- 			   }
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------------- store
- 		} elsif ($userinput =~ /^store/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$rid,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if ($namespace ne 'roles') {
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    unless ($namespace=~/^nohist\_/) {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) { print $hfh "P:$now:$rid:$what\n"; }
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 				my @previouskeys=split(/&/,$hash{"keys:$rid"});
- 				my $key;
- 				$hash{"version:$rid"}++;
- 				my $version=$hash{"version:$rid"};
- 				my $allkeys='';
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
- 				    $allkeys.=$key.':';
- 				    $hash{"$version:$rid:$key"}=$value;
- 				}
- 				$hash{"$version:$rid:timestamp"}=$now;
- 				$allkeys.='timestamp';
- 				$hash{"$version:keys:$rid"}=$allkeys;
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) Failed ".
- 					"while attempting store\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting store\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # --------------------------------------------------------------------- restore
- 		} elsif ($userinput =~ /^restore/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$rid)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($rid);
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    my $version=$hash{"version:$rid"};
- 			    $qresult.="version=$version&";
- 			    my $scope;
- 			    for ($scope=1;$scope<=$version;$scope++) {
- 				my $vkeys=$hash{"$scope:keys:$rid"};
- 				my @keys=split(/:/,$vkeys);
- 				my $key;
- 				$qresult.="$scope:keys=$vkeys&";
- 				foreach $key (@keys) {
- 				    $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
- 				}
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting restore\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting restore\n";
- 			}
- 		    } else  {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- chatsend
- 		} elsif ($userinput =~ /^chatsend/) {
- 		    if(isClient) {
- 			my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
- 			&chatadd($cdom,$cnum,$newpost);
- 			print $client "ok\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- chatretr
- 		} elsif ($userinput =~ /^chatretr/) {
- 		    if(isClient) {
- 			my
- 			    ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
- 			my $reply='';
- 			foreach (&getchat($cdom,$cnum,$udom,$uname)) {
- 			    $reply.=&escape($_).':';
- 			}
- 			$reply=~s/\:$//;
- 			print $client $reply."\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------- querysend
- 		} elsif ($userinput =~ /^querysend/) {
- 		    if(isClient) {
- 			my ($cmd,$query,
- 			    $arg1,$arg2,$arg3)=split(/\:/,$userinput);
- 			$query=~s/\n*$//g;
- 			print $client "".
- 			    sqlreply("$clientname\&$query".
- 				     "\&$arg1"."\&$arg2"."\&$arg3")."\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------ queryreply
- 		} elsif ($userinput =~ /^queryreply/) {
- 		    if(isClient) {
- 			my ($cmd,$id,$reply)=split(/:/,$userinput);
- 			my $store;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if ($store=IO::File->new(">$execdir/tmp/$id")) {
- 			    $reply=~s/\&/\n/g;
- 			    print $store $reply;
- 			    close $store;
- 			    my $store2=IO::File->new(">$execdir/tmp/$id.end");
- 			    print $store2 "done\n";
- 			    close $store2;
- 			    print $client "ok\n";
- 			}
- 			else {
- 			    print $client "error: ".($!+0)
- 				." IO::File->new Failed ".
- 				"while attempting queryreply\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- courseidput
- 		} elsif ($userinput =~ /^courseidput/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			$udom=~s/\W//g;
- 			my $proname=
- 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
- 			my $now=time;
- 			my @pairs=split(/\&/,$what);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
- 			    foreach my $pair (@pairs) {
- 				my ($key,$value)=split(/=/,$pair);
- 				$hash{$key}=$value.':'.$now;
- 			    }
- 			    if (untie(%hash)) {
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting courseidput\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting courseidput\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------- courseiddump
- 		} elsif ($userinput =~ /^courseiddump/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$since,$description)
- 			    =split(/:/,$userinput);
- 			if (defined($description)) {
- 			    $description=&unescape($description);
- 			} else {
- 			    $description='.';
- 			}
- 			unless (defined($since)) { $since=0; }
- 			my $qresult='';
- 			my $proname=
- 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
- 			    while (my ($key,$value) = each(%hash)) {
- 				my ($descr,$lasttime)=split(/\:/,$value);
- 				if ($lasttime<$since) { next; }
- 				if ($description eq '.') {
- 				    $qresult.=$key.'='.$descr.'&';
- 				} else {
- 				    my $unescapeVal = &unescape($descr);
- 				    if (eval('$unescapeVal=~/$description/i')) {
- 					$qresult.="$key=$descr&";
- 				    }
- 				}
- 			    }
- 			    if (untie(%hash)) {
- 				chop($qresult);
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting courseiddump\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting courseiddump\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------------- idput
- 		} elsif ($userinput =~ /^idput/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			$udom=~s/\W//g;
- 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
- 			my $now=time;
- 			{
- 			    my $hfh;
- 			    if (
- 				$hfh=IO::File->new(">>$proname.hist")
- 				) { print $hfh "P:$now:$what\n"; }
- 			}
- 			my @pairs=split(/\&/,$what);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
- 			    foreach my $pair (@pairs) {
- 				my ($key,$value)=split(/=/,$pair);
- 				$hash{$key}=$value;
- 			    }
- 			    if (untie(%hash)) {
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting idput\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting idput\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------------- idget
- 		} elsif ($userinput =~ /^idget/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			$udom=~s/\W//g;
- 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
- 			my @queries=split(/\&/,$what);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
- 			    for (my $i=0;$i<=$#queries;$i++) {
- 				$qresult.="$hash{$queries[$i]}&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting idget\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting idget\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- tmpput
- 		} elsif ($userinput =~ /^tmpput/) {
- 		    if(isClient) {
- 			my ($cmd,$what)=split(/:/,$userinput);
- 			my $store;
- 			$tmpsnum++;
- 			my $id=$$.'_'.$clientip.'_'.$tmpsnum;
- 			$id=~s/\W/\_/g;
- 			$what=~s/\n//g;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
- 			    print $store $what;
- 			    close $store;
- 			    print $client "$id\n";
- 			}
- 			else {
- 			    print $client "error: ".($!+0)
- 				."IO::File->new Failed ".
- 				"while attempting tmpput\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- tmpget
- 		} elsif ($userinput =~ /^tmpget/) {
- 		    if(isClient) {
- 			my ($cmd,$id)=split(/:/,$userinput);
- 			chomp($id);
- 			$id=~s/\W/\_/g;
- 			my $store;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
- 			    my $reply=<$store>;
- 			    print $client "$reply\n";
- 			    close $store;
- 			}
- 			else {
- 			    print $client "error: ".($!+0)
- 				."IO::File->new Failed ".
- 				"while attempting tmpget\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- tmpdel
- 		} elsif ($userinput =~ /^tmpdel/) {
- 		    if(isClient) {
- 			my ($cmd,$id)=split(/:/,$userinput);
- 			chomp($id);
- 			$id=~s/\W/\_/g;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if (unlink("$execdir/tmp/$id.tmp")) {
- 			    print $client "ok\n";
- 			} else {
- 			    print $client "error: ".($!+0)
- 				."Unlink tmp Failed ".
- 				"while attempting tmpdel\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------------- ls
- 		} elsif ($userinput =~ /^ls/) {
- 		    if(isClient) {
- 			my $obs;
- 			my $rights;
- 			my ($cmd,$ulsdir)=split(/:/,$userinput);
- 			my $ulsout='';
- 			my $ulsfn;
- 			if (-e $ulsdir) {
- 			    if(-d $ulsdir) {
- 				if (opendir(LSDIR,$ulsdir)) {
- 				    while ($ulsfn=readdir(LSDIR)) {
- 					undef $obs, $rights;
- 					my @ulsstats=stat($ulsdir.'/'.$ulsfn);
- 					#We do some obsolete checking here
- 					if(-e $ulsdir.'/'.$ulsfn.".meta") {
- 					    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
- 					    my @obsolete=<FILE>;
- 					    foreach my $obsolete (@obsolete) {
- 					        if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
- 						if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
- 					    }
- 					}
- 					$ulsout.=$ulsfn.'&'.join('&',@ulsstats);
- 					if($obs eq '1') { $ulsout.="&1"; }
- 					else { $ulsout.="&0"; }
- 					if($rights eq '1') { $ulsout.="&1:"; }
- 					else { $ulsout.="&0:"; }
- 				    }
- 				    closedir(LSDIR);
- 				}
- 			    } else {
- 				my @ulsstats=stat($ulsdir);
- 				$ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
- 			    }
- 			} else {
- 			    $ulsout='no_such_dir';
- 			}
- 			if ($ulsout eq '') { $ulsout='empty'; }
- 			print $client "$ulsout\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- setannounce
- 		} elsif ($userinput =~ /^setannounce/) {
- 		    if (isClient) {
- 			my ($cmd,$announcement)=split(/:/,$userinput);
- 			chomp($announcement);
- 			$announcement=&unescape($announcement);
- 			if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
- 						    '/announcement.txt')) {
- 			    print $store $announcement;
- 			    close $store;
- 			    print $client "ok\n";
- 			} else {
- 			    print $client "error: ".($!+0)."\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------ Hanging up
- 		} elsif (($userinput =~ /^exit/) ||
- 			 ($userinput =~ /^init/)) { # no restrictions.
- 		    &logthis(
- 			     "Client $clientip ($clientname) hanging up: $userinput");
- 		    print $client "bye\n";
- 		    $client->shutdown(2);        # shutdown the socket forcibly.
- 		    $client->close();
- 		    last;
- # ---------------------------------- set current host/domain
- 		} elsif ($userinput =~ /^sethost:/) {
- 		    if (isClient) {
- 			print $client &sethost($userinput)."\n";
- 		    } else {
- 			print $client "refused\n";
- 		    }
- #---------------------------------- request file (?) version.
- 		} elsif ($userinput =~/^version:/) {
- 		    if (isClient) {
- 			print $client &version($userinput)."\n";
- 		    } else {
- 			print $client "refused\n";
- 		    }
- # ------------------------------------------------------------- unknown command
- 		} else {
- 		    # unknown command
- 		    print $client "unknown_cmd\n";
- 		}
- # -------------------------------------------------------------------- complete
  		alarm(0);
- 		&status('Listening to '.$clientname);
+ 		&status('Listening to '.$clientname." ($keymode)");
  	    }
  # --------------------------------------------- client unknown or fishy, refuse
- 	} else {
+ 	}  else {
  	    print $client "refused\n";
  	    $client->close();
- 	    &logthis("<font color=blue>WARNING: "
+ 	    &logthis("<font color='blue'>WARNING: "
  		     ."Rejected client $clientip, closing connection</font>");
  	}
      }
  # =============================================================================
-     &logthis("<font color=red>CRITICAL: "
+     &logthis("<font color='red'>CRITICAL: "
  	     ."Disconnect from $clientip ($clientname)</font>");
- Line 2864  sub make_new_child {
+ Line 5528  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;
+     if (defined($hashref)) {
+ 	$value = $hashref->{$key};
+     }
+     if(defined($value)) {
+ 	&Debug("$user @ $domain is an author");
+     }
+     return defined($value);
+ }
  #
  #   Checks to see if the input roleput request was to set
  # an author role.  If so, invokes the lchtmldir script to set
- Line 2877  sub make_new_child {
+ Line 5571  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) = @_;
-     my $request = shift;
-     my $domain  = shift;
+     &Debug("manage_permissions: $request $domain $user $authtype");
-     my $user    = shift;
-     my $authtype= shift;
      # See if the request is of the form /$domain/_au
-     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
+     if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
  	my $execdir = $perlvar{'lonDaemons'};
  	my $userhome= "/home/$user" ;
  	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
+ 	&Debug("Setting homedir permissions for $userhome");
  	system("$execdir/lchtmldir $userhome $user $authtype");
      }
  }
+ #
+ #  Return the full path of a user password file, whether it exists or not.
+ # Parameters:
+ #   domain     - Domain in which the password file lives.
+ #   user       - name of the user.
+ # Returns:
+ #    Full passwd path:
+ #
+ sub password_path {
+     my ($domain, $user) = @_;
+     return &propath($domain, $user).'/passwd';
+ }
+ #   Password Filename
+ #   Returns the path to a passwd file given domain and user... only if
+ #  it exists.
+ # Parameters:
+ #   domain    - Domain in which to search.
+ #   user      - username.
+ # Returns:
+ #   - If the password file exists returns its path.
+ #   - If the password file does not exist, returns undefined.
+ #
+ sub password_filename {
+     my ($domain, $user) = @_;
+     Debug ("PasswordFilename called: dom = $domain user = $user");
+     my $path  = &password_path($domain, $user);
+     Debug("PasswordFilename got path: $path");
+     if(-e $path) {
+ 	return $path;
+     } else {
+ 	return undef;
+     }
+ }
+ #
+ #   Rewrite the contents of the user's passwd file.
+ #  Parameters:
+ #    domain    - domain of the user.
+ #    name      - User's name.
+ #    contents  - New contents of the file.
+ # Returns:
+ #   0    - Failed.
+ #   1    - Success.
+ #
+ sub rewrite_password_file {
+     my ($domain, $user, $contents) = @_;
+     my $file = &password_filename($domain, $user);
+     if (defined $file) {
+ 	my $pf = IO::File->new(">$file");
+ 	if($pf) {
+ 	    print $pf "$contents\n";
+ 	    return 1;
+ 	} else {
+ 	    return 0;
+ 	}
+     } else {
+ 	return 0;
+     }
+ }
  #
- #   GetAuthType - Determines the authorization type of a user in a domain.
+ #   get_auth_type - Determines the authorization type of a user in a domain.
  #     Returns the authorization type or nouser if there is no such user.
  #
- sub GetAuthType
+ sub get_auth_type
  {
-     my $domain = shift;
-     my $user   = shift;
-     Debug("GetAuthType( $domain, $user ) \n");
+     my ($domain, $user)  = @_;
+     Debug("get_auth_type( $domain, $user ) \n");
      my $proname    = &propath($domain, $user);
      my $passwdfile = "$proname/passwd";
      if( -e $passwdfile ) {
- Line 2912  sub GetAuthType
+ Line 5672  sub GetAuthType
  	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') {
+     } else {
- 	    $availinfo = $contentpwd;
- 	}
- 	return "$authtype:$availinfo";
-     }
-     else {
  	Debug("Returning nouser");
  	return "nouser";
      }
  }
+ #
+ #  Validate a user given their domain, name and password.  This utility
+ #  function is used by both  AuthenticateHandler and ChangePasswordHandler
+ #  to validate the login credentials of a user.
+ # Parameters:
+ #    $domain    - The domain being logged into (this is required due to
+ #                 the capability for multihomed systems.
+ #    $user      - The name of the user being validated.
+ #    $password  - The user's propoposed password.
+ #
+ # Returns:
+ #     1        - The domain,user,pasword triplet corresponds to a valid
+ #                user.
+ #     0        - The domain,user,password triplet is not a valid user.
+ #
+ sub validate_user {
+     my ($domain, $user, $password) = @_;
+     # Why negative ~pi you may well ask?  Well this function is about
+     # authentication, and therefore very important to get right.
+     # I've initialized the flag that determines whether or not I've
+     # validated correctly to a value it's not supposed to get.
+     # At the end of this function. I'll ensure that it's not still that
+     # value so we don't just wind up returning some accidental value
+     # as a result of executing an unforseen code path that
+     # did not set $validated.  At the end of valid execution paths,
+     # validated shoule be 1 for success or 0 for failuer.
+     my $validated = -3.14159;
+     #  How we authenticate is determined by the type of authentication
+     #  the user has been assigned.  If the authentication type is
+     #  "nouser", the user does not exist so we will return 0.
+     my $contents = &get_auth_type($domain, $user);
+     my ($howpwd, $contentpwd) = split(/:/, $contents);
+     my $null = pack("C",0);	# Used by kerberos auth types.
+     if ($howpwd ne 'nouser') {
+ 	if($howpwd eq "internal") { # Encrypted is in local password file.
+ 	    $validated = (crypt($password, $contentpwd) eq $contentpwd);
+ 	}
+ 	elsif ($howpwd eq "unix") { # User is a normal unix user.
+ 	    $contentpwd = (getpwnam($user))[1];
+ 	    if($contentpwd) {
+ 		if($contentpwd eq 'x') { # Shadow password file...
+ 		    my $pwauth_path = "/usr/local/sbin/pwauth";
+ 		    open PWAUTH,  "|$pwauth_path" or
+ 			die "Cannot invoke authentication";
+ 		    print PWAUTH "$user\n$password\n";
+ 		    close PWAUTH;
+ 		    $validated = ! $?;
+ 		} else { 	         # Passwords in /etc/passwd.
+ 		    $validated = (crypt($password,
+ 					$contentpwd) eq $contentpwd);
+ 		}
+ 	    } else {
+ 		$validated = 0;
+ 	    }
+ 	}
+ 	elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
+ 	    if(! ($password =~ /$null/) ) {
+ 		my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
+ 							   "",
+ 							   $contentpwd,,
+ 							   'krbtgt',
+ 							   $contentpwd,
+,
+ 							   $password);
+ 		if(!$k4error) {
+ 		    $validated = 1;
+ 		} else {
+ 		    $validated = 0;
+ 		    &logthis('krb4: '.$user.', '.$contentpwd.', '.
+ 			     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
+ 		}
+ 	    } else {
+ 		$validated = 0; # Password has a match with null.
+ 	    }
+ 	} elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
+ 	    if(!($password =~ /$null/)) { # Null password not allowed.
+ 		my $krbclient = &Authen::Krb5::parse_name($user.'@'
+ 							  .$contentpwd);
+ 		my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
+ 		my $krbserver  = &Authen::Krb5::parse_name($krbservice);
+ 		my $credentials= &Authen::Krb5::cc_default();
+ 		$credentials->initialize(&Authen::Krb5::parse_name($user.'@'
+                                                                  .$contentpwd));
+ 		my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
+ 									 $krbserver,
+ 									 $password,
+ 									 $credentials);
+ 		$validated = ($krbreturn == 1);
+ 	    } else {
+ 		$validated = 0;
+ 	    }
+ 	} elsif ($howpwd eq "localauth") {
+ 	    #  Authenticate via installation specific authentcation method:
+ 	    $validated = &localauth::localauth($user,
+ 					       $password,
+ 					       $contentpwd,
+ 					       $domain);
+ 	    if ($validated < 0) {
+ 		&logthis("localauth for $contentpwd $user:$domain returned a $validated");
+ 		$validated = 0;
+ 	    }
+ 	} else {			# Unrecognized auth is also bad.
+ 	    $validated = 0;
+ 	}
+     } else {
+ 	$validated = 0;
+     }
+     #
+     #  $validated has the correct stat of the authentication:
+     #
+     unless ($validated != -3.14159) {
+ 	#  I >really really< want to know if this happens.
+ 	#  since it indicates that user authentication is badly
+ 	#  broken in some code path.
+         #
+ 	die "ValidateUser - failed to set the value of validated $domain, $user $password";
+     }
+     return $validated;
+ }
  sub addline {
      my ($fname,$hostid,$ip,$newline)=@_;
      my $contents;
      my $found=0;
-     my $expr='^'.$hostid.':'.$ip.':';
+     my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
-     $expr =~ s/\./\\\./g;
      my $sh;
      if ($sh=IO::File->new("$fname.subscription")) {
  	while (my $subline=<$sh>) {
- Line 2945  sub addline {
+ Line 5829  sub addline {
      return $found;
  }
- sub getchat {
+ sub get_chat {
-     my ($cdom,$cname,$udom,$uname)=@_;
+     my ($cdom,$cname,$udom,$uname,$group)=@_;
-     my %hash;
-     my $proname=&propath($cdom,$cname);
      my @entries=();
-     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
+     my $namespace = 'nohist_chatroom';
- 	    &GDBM_READER(),0640)) {
+     my $namespace_inroom = 'nohist_inchatroom';
- 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
+     if ($group ne '') {
- 	untie %hash;
+         $namespace .= '_'.$group;
+         $namespace_inroom .= '_'.$group;
+     }
+     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+ 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
+ 	&untie_user_hash($hashref);
      }
      my @participants=();
      my $cutoff=time-60;
-     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
+     $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
- 	    &GDBM_WRCREAT(),0640)) {
+ 			      &GDBM_WRCREAT());
-         $hash{$uname.':'.$udom}=time;
+     if ($hashref) {
-         foreach (sort keys %hash) {
+         $hashref->{$uname.':'.$udom}=time;
- 	    if ($hash{$_}>$cutoff) {
+         foreach my $user (sort(keys(%$hashref))) {
- 		$participants[$#participants+1]='active_participant:'.$_;
+ 	    if ($hashref->{$user}>$cutoff) {
+ 		push(@participants, 'active_participant:'.$user);
              }
          }
-         untie %hash;
+         &untie_user_hash($hashref);
      }
      return (@participants,@entries);
  }
- sub chatadd {
+ sub chat_add {
-     my ($cdom,$cname,$newchat)=@_;
+     my ($cdom,$cname,$newchat,$group)=@_;
-     my %hash;
-     my $proname=&propath($cdom,$cname);
      my @entries=();
      my $time=time;
-     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
+     my $namespace = 'nohist_chatroom';
- 	    &GDBM_WRCREAT(),0640)) {
+     my $logfile = 'chatroom.log';
- 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
+     if ($group ne '') {
+         $namespace .= '_'.$group;
+         $logfile = 'chatroom_'.$group.'.log';
+     }
+     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
+ 				 &GDBM_WRCREAT());
+     if ($hashref) {
+ 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
  	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
  	my ($thentime,$idnum)=split(/\_/,$lastid);
  	my $newid=$time.'_000000';
- Line 2988  sub chatadd {
+ Line 5884  sub chatadd {
  	    $idnum=substr('000000'.$idnum,-6,6);
  	    $newid=$time.'_'.$idnum;
  	}
- 	$hash{$newid}=$newchat;
+ 	$hashref->{$newid}=$newchat;
  	my $expired=$time-3600;
- 	foreach (keys %hash) {
+ 	foreach my $comment (keys(%$hashref)) {
- 	    my ($thistime)=($_=~/(\d+)\_/);
+ 	    my ($thistime) = ($comment=~/(\d+)\_/);
  	    if ($thistime<$expired) {
- 		delete $hash{$_};
+ 		delete $hashref->{$comment};
  	    }
  	}
- 	untie %hash;
+ 	{
-     }
+ 	    my $proname=&propath($cdom,$cname);
-     {
+ 	    if (open(CHATLOG,">>$proname/$logfile")) {
- 	my $hfh;
+ 		print CHATLOG ("$time:".&unescape($newchat)."\n");
- 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
+ 	    }
- 	    print $hfh "$time:".&unescape($newchat)."\n";
+ 	    close(CHATLOG);
  	}
+ 	&untie_user_hash($hashref);
      }
  }
  sub unsub {
      my ($fname,$clientip)=@_;
      my $result;
+     my $unsubs = 0;		# Number of successful unsubscribes:
+     # An old way subscriptions were handled was to have a
+     # subscription marker file:
+     Debug("Attempting unlink of $fname.$clientname");
      if (unlink("$fname.$clientname")) {
- 	$result="ok\n";
+ 	$unsubs++;		# Successful unsub via marker file.
-     } else {
+     }
- 	$result="not_subscribed\n";
-     }
+     # The more modern way to do it is to have a subscription list
+     # file:
      if (-e "$fname.subscription") {
  	my $found=&addline($fname,$clientname,$clientip,'');
- 	if ($found) { $result="ok\n"; }
+ 	if ($found) {
+ 	    $unsubs++;
+ 	}
+     }
+     #  If either or both of these mechanisms succeeded in unsubscribing a
+     #  resource we can return ok:
+     if($unsubs) {
+ 	$result = "ok\n";
      } else {
- 	if ($result != "ok\n") { $result="not_subscribed\n"; }
+ 	$result = "not_subscribed\n";
      }
      return $result;
  }
- Line 3072  sub thisversion {
+ Line 5988  sub thisversion {
  sub subscribe {
      my ($userinput,$clientip)=@_;
      my $result;
-     my ($cmd,$fname)=split(/:/,$userinput);
+     my ($cmd,$fname)=split(/:/,$userinput,2);
      my $ownership=&ishome($fname);
      if ($ownership eq 'owner') {
  # explitly asking for the current version?
- Line 3116  sub subscribe {
+ Line 6032  sub subscribe {
      }
      return $result;
  }
+ #  Change the passwd of a unix user.  The caller must have
+ #  first verified that the user is a loncapa user.
+ #
+ # Parameters:
+ #    user      - Unix user name to change.
+ #    pass      - New password for the user.
+ # Returns:
+ #    ok    - if success
+ #    other - Some meaningfule error message string.
+ # NOTE:
+ #    invokes a setuid script to change the passwd.
+ sub change_unix_password {
+     my ($user, $pass) = @_;
+     &Debug("change_unix_password");
+     my $execdir=$perlvar{'lonDaemons'};
+     &Debug("Opening lcpasswd pipeline");
+     my $pf = IO::File->new("|$execdir/lcpasswd > "
+ 			   ."$perlvar{'lonDaemons'}"
+ 			   ."/logs/lcpasswd.log");
+     print $pf "$user\n$pass\n$pass\n";
+     close $pf;
+     my $err = $?;
+     return ($err < @passwderrors) ? $passwderrors[$err] :
+ 	"pwchange_falure - unknown error";
+ }
  sub make_passwd_file {
      my ($uname, $umode,$npass,$passfilename)=@_;
- Line 3123  sub make_passwd_file {
+ Line 6068  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 3132  sub make_passwd_file {
+ Line 6081  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 3151  sub make_passwd_file {
+ Line 6108  sub make_passwd_file {
  		return "no_priv_account_error\n";
  	    }
- 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
+ 	    my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
+ 	    my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
  	    {
  		&Debug("Executing external: ".$execpath);
  		&Debug("user  = ".$uname.", Password =". $npass);
- Line 3159  sub make_passwd_file {
+ Line 6118  sub make_passwd_file {
  		print $se "$uname\n";
  		print $se "$npass\n";
  		print $se "$npass\n";
+ 		print $se "$lc_error_file\n"; # Status -> unique file.
  	    }
- 	    my $useraddok = $?;
+ 	    if (-r $lc_error_file) {
- 	    if($useraddok > 0) {
+ 		&Debug("Opening error file: $lc_error_file");
- 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
+ 		my $error = IO::File->new("< $lc_error_file");
+ 		my $useraddok = <$error>;
+ 		$error->close;
+ 		unlink($lc_error_file);
+ 		chomp $useraddok;
+ 		if($useraddok > 0) {
+ 		    my $error_text = &lcuseraddstrerror($useraddok);
+ 		    &logthis("Failed lcuseradd: $error_text");
+ 		    $result = "lcuseradd_failed:$error_text\n";
+ 		}  else {
+ 		    my $pf = IO::File->new(">$passfilename");
+ 		    if($pf) {
+ 			print $pf "unix:\n";
+ 		    } else {
+ 			$result = "pass_file_failed_error";
+ 		    }
+ 		}
+ 	    }  else {
+ 		&Debug("Could not locate lcuseradd error: $lc_error_file");
+ 		$result="bug_lcuseradd_no_output_file";
  	    }
- 	    my $pf = IO::File->new(">$passfilename");
- 	    print $pf "unix:\n";
  	}
      } elsif ($umode eq 'none') {
  	{
- 	    my $pf = IO::File->new(">$passfilename");
+ 	    my $pf = IO::File->new("> $passfilename");
- 	    print $pf "none:\n";
+ 	    if($pf) {
+ 		print $pf "none:\n";
+ 	    } else {
+ 		$result = "pass_file_failed_error";
+ 	    }
  	}
      } else {
  	$result="auth_mode_error\n";
- Line 3178  sub make_passwd_file {
+ Line 6161  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);
+     # ignore sethost if we are already correct
+     if ($hostid eq $currenthostid) {
+ 	return 'ok';
+     }
      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
-     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
+     if (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'})
- 	$currenthostid=$hostid;
+ 	eq &Apache::lonnet::get_host_ip($hostid)) {
- 	$currentdomainid=$hostdom{$hostid};
+ 	$currenthostid  =$hostid;
+ 	$currentdomainid=&Apache::lonnet::host_domain($hostid);
  	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
      } else {
  	&logthis("Requested host id $hostid not an alias of ".
- Line 3200  sub version {
+ Line 6194  sub version {
      return "version:$VERSION";
  }
- #There is a copy of this in lonnet.pm
- sub userload {
-     my $numusers=0;
-     {
- 	opendir(LONIDS,$perlvar{'lonIDsDir'});
- 	my $filename;
- 	my $curtime=time;
- 	while ($filename=readdir(LONIDS)) {
- 	    if ($filename eq '.' || $filename eq '..') {next;}
- 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
- 	    if ($curtime-$mtime < 1800) { $numusers++; }
- 	}
- 	closedir(LONIDS);
-     }
-     my $userloadpercent=0;
-     my $maxuserload=$perlvar{'lonUserLoadLim'};
-     if ($maxuserload) {
- 	$userloadpercent=100*$numusers/$maxuserload;
-     }
-     $userloadpercent=sprintf("%.2f",$userloadpercent);
-     return $userloadpercent;
- }
  # ----------------------------------- POD (plain old documentation, CPAN style)
- Line 3430  Place in B<logs/lond.log>
+ Line 6402  Place in B<logs/lond.log>
  stores hash in namespace
- =item rolesput
+ =item rolesputy
  put a role into a user's environment
- Line 3538  to the client, and the connection is clo
+ Line 6510  to the client, and the connection is clo
  IO::Socket
  IO::File
  Apache::File
- Symbol
  POSIX
  Crypt::IDEA
  LWP::UserAgent()

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

Removed from v.1.186
changed lines
	Added in v.1.370