loncom/lond - diff

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Diff for /loncom/lond between versions 1.193 and 1.226

-version 1.193, 2004/06/08 22:09:44
+version 1.226, 2004/08/10 11:30:24
  Line 48  use localauth;
  use localenroll;
  use File::Copy;
  use LONCAPA::ConfigFileEdit;
+ use LONCAPA::lonlocal;
+ use LONCAPA::lonssl;
+ use Fcntl qw(:flock);
  my $DEBUG = 0;		       # Non zero to enable debug log entries.
- Line 56  my $lastlog='';
+ Line 59  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 $clientdns;			# DNS name of client.
+ 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 75  my $thisserver;
+ Line 84  my $thisserver;
  my $ConnectionType;
- my %hostid;
+ my %hostid;			# ID's for hosts in cluster by ip.
- my %hostdom;
+ my %hostdom;			# LonCAPA domain for hosts in cluster.
- my %hostip;
+ my %hostip;			# IPs for hosts in cluster.
+ my %hostdns;			# ID's of hosts looked up by DNS name.
  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.
- Line 98  my @passwderrors = ("ok",
+ Line 122  my @passwderrors = ("ok",
  		   "lcpasswd Cannot set new passwd.",
  		   "lcpasswd Username has invalid characters",
  		   "lcpasswd Invalid characters in password",
- 		    "11", "12",
+ 		   "lcpasswd User already exists",
- 		    "lcpasswd Password mismatch");
+                    "lcpasswd Something went wrong with user addition.",
+ 		    "lcpasswd Password mismatch",
+ 		    "lcpasswd Error filename is invalid");
  #  The array below are lcuseradd error strings.:
- Line 121  my @adderrors    = ("ok",
+ Line 147  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:
+ #    $clientdns  - The DNS name of the remote client.
+ #    $thisserver - Our DNS name.
+ #
+ # Returns:
+ #     IDEA session key on success.
+ #     undef on failure.
+ #
+ sub LocalConnection {
+     my ($Socket, $initcmd) = @_;
+     Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
+     if($clientdns ne $thisserver) {
+ 	&logthis('<font color="red"> LocalConnection rejecting non local: '
+ 		 ."$clientdns 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;
+     }
+ }
  #
  #   GetCertificate: Given a transaction that requires a certificate,
  #   this function will extract the certificate from the transaction
- Line 159  sub isClient {
+ Line 370  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 176  sub ReadManagerTable {
+ Line 386  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
- Line 351  sub InstallFile {
+ Line 560  sub InstallFile {
      return 1;
  }
  #
  #   ConfigFileFromSelector: converts a configuration file selector
  #                 (one of host or domain at this point) into a
- Line 440  sub PushFile {
+ Line 651  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 720  sub EditFile {
+ Line 930  sub EditFile {
      return "ok\n";
  }
+ #---------------------------------------------------------------
+ #
+ # Manipulation of hash based databases (factoring out common code
+ # for later use as we refactor.
+ #
+ #  Ties a domain level resource file to a hash.
+ #  If requested a history entry is created in the associated hist file.
+ #
+ #  Parameters:
+ #     domain    - Name of the domain in which the resource file lives.
+ #     namespace - Name of the hash within that domain.
+ #     how       - How to tie the hash (e.g. GDBM_WRCREAT()).
+ #     loghead   - Optional parameter, if present a log entry is created
+ #                 in the associated history file and this is the first part
+ #                  of that entry.
+ #     logtail   - Goes along with loghead,  The actual logentry is of the
+ #                 form $loghead:<timestamp>:logtail.
+ # Returns:
+ #    Reference to a hash bound to the db file or alternatively undef
+ #    if the tie failed.
+ #
+ sub tie_domain_hash {
+     my ($domain,$namespace,$how,$loghead,$logtail) = @_;
+     # Filter out any whitespace in the domain name:
+     $domain =~ s/\W//g;
+     # We have enough to go on to tie the hash:
+     my $user_top_dir   = $perlvar{'lonUsersDir'};
+     my $domain_dir     = $user_top_dir."/$domain";
+     my $resource_file  = $domain_dir."/$namespace.db";
+     my %hash;
+     if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
+ 	if (defined($loghead)) {	# Need to log the operation.
+ 	    my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
+ 	    if($logFh) {
+ 		my $timestamp = time;
+ 		print $logFh "$loghead:$timestamp:$logtail\n";
+ 	    }
+ 	    $logFh->close;
+ 	}
+ 	return \%hash;		# Return the tied hash.
+     } else {
+ 	return undef;		# Tie failed.
+     }
+ }
+ #
+ #   Ties a user's resource file to a hash.
+ #   If necessary, an appropriate history
+ #   log file entry is made as well.
+ #   This sub factors out common code from the subs that manipulate
+ #   the various gdbm files that keep keyword value pairs.
+ # Parameters:
+ #   domain       - Name of the domain the user is in.
+ #   user         - Name of the 'current user'.
+ #   namespace    - Namespace representing the file to tie.
+ #   how          - What the tie is done to (e.g. GDBM_WRCREAT().
+ #   loghead      - Optional first part of log entry if there may be a
+ #                  history file.
+ #   what         - Optional tail of log entry if there may be a history
+ #                  file.
+ # Returns:
+ #   hash to which the database is tied.  It's up to the caller to untie.
+ #   undef if the has could not be tied.
+ #
+ sub tie_user_hash {
+     my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
+     $namespace=~s/\//\_/g;	# / -> _
+     $namespace=~s/\W//g;		# whitespace eliminated.
+     my $proname     = propath($domain, $user);
+     #  Tie the database.
+     my %hash;
+     if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
+ 	   $how, 0640)) {
+ 	# If this is a namespace for which a history is kept,
+ 	# make the history log entry:
+ 	if (($namespace =~/^nohist\_/) && (defined($loghead))) {
+ 	    my $args = scalar @_;
+ 	    Debug(" Opening history: $namespace $args");
+ 	    my $hfh = IO::File->new(">>$proname/$namespace.hist");
+ 	    if($hfh) {
+ 		my $now = time;
+ 		print $hfh "$loghead:$now:$what\n";
+ 	    }
+ 	    $hfh->close;
+ 	}
+ 	return \%hash;
+     } else {
+ 	return undef;
+     }
+ }
+ #--------------------- Request Handlers --------------------------------------------
+ #
+ #   By convention each request handler registers itself prior to the sub
+ #   declaration:
+ #
+ #++
+ #
+ #  Handles ping requests.
+ #  Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host we are
+ #                       known as.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub ping_handler {
+     my ($cmd, $tail, $client) = @_;
+     Debug("$cmd $tail $client .. $currenthostid:");
+     Reply( $client,"$currenthostid\n","$cmd:$tail");
+     return 1;
+ }
+ &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
+ #++
+ #
+ # Handles pong requests.  Pong replies with our current host id, and
+ #                         the results of a ping sent to us via our lonc.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host we are
+ #                       connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub pong_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $reply=&reply("ping",$clientname);
+     &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
+ #++
+ #      Called to establish an encrypted session key with the remote client.
+ #      Note that with secure lond, in most cases this function is never
+ #      invoked.  Instead, the secure session key is established either
+ #      via a local file that's locked down tight and only lives for a short
+ #      time, or via an ssl tunnel...and is generated from a bunch-o-random
+ #      bits from /dev/urandom, rather than the predictable pattern used by
+ #      by this sub.  This sub is only used in the old-style insecure
+ #      key negotiation.
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the hsot we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Implicit Outputs:
+ #      Reply information is sent to the client.
+ #      $cipher is set with a reference to a new IDEA encryption object.
+ #
+ sub establish_key_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $buildkey=time.$$.int(rand 100000);
+     $buildkey=~tr/1-6/A-F/;
+     $buildkey=int(rand 100000).$buildkey.int(rand 100000);
+     my $key=$currenthostid.$clientname;
+     $key=~tr/a-z/A-Z/;
+     $key=~tr/G-P/0-9/;
+     $key=~tr/Q-Z/0-9/;
+     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
+     $key=substr($key,0,32);
+     my $cipherkey=pack("H32",$key);
+     $cipher=new IDEA $cipherkey;
+     &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("ekey", \&establish_key_handler, 0, 1,1);
+ #     Handler for the load command.  Returns the current system load average
+ #     to the requestor.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the hsot we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub load_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+    # Get the load average from /proc/loadavg and calculate it as a percentage of
+    # the allowed load limit as set by the perl global variable lonLoadLim
+     my $loadavg;
+     my $loadfile=IO::File->new('/proc/loadavg');
+     $loadavg=<$loadfile>;
+     $loadavg =~ s/\s.*//g;                      # Extract the first field only.
+     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
+     &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
+     return 1;
+ }
+ register_handler("load", \&load_handler, 0, 1, 0);
+ #
+ #   Process the userload request.  This sub returns to the client the current
+ #  user load average.  It can be invoked either by clients or managers.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the hsot we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit inputs:
+ #     whatever the userload() function requires.
+ #  Implicit outputs:
+ #     the reply is written to the client.
+ #
+ sub user_load_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $userloadpercent=&userload();
+     &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
+     return 1;
+ }
+ register_handler("userload", \&user_load_handler, 0, 1, 0);
+ #   Process a request for the authorization type of a user:
+ #   (userauth).
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit outputs:
+ #    The user authorization type is written to the client.
+ #
+ sub user_authorization_type {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $userinput = "$cmd:$tail";
+     #  Pull the domain and username out of the command tail.
+     # and call get_auth_type to determine the authentication type.
+     my ($udom,$uname)=split(/:/,$tail);
+     my $result = &get_auth_type($udom, $uname);
+     if($result eq "nouser") {
+ 	&Failure( $replyfd, "unknown_user\n", $userinput);
+     } else {
+ 	#
+ 	# We only want to pass the second field from get_auth_type
+ 	# for ^krb.. otherwise we'll be handing out the encrypted
+ 	# password for internals e.g.
+ 	#
+ 	my ($type,$otherinfo) = split(/:/,$result);
+ 	if($type =~ /^krb/) {
+ 	    $type = $result;
+ 	}
+ 	&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);
+ #   Process a reinit request.  Reinit requests that either
+ #   lonc or lond be reinitialized so that an updated
+ #   host.tab or domain.tab can be processed.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ #  Implicit output:
+ #     a reply is sent to the client.
+ #
+ sub reinit_process_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	chomp($userinput);
+ 	my $reply = &ReinitProcess($userinput);
+ 	&Reply( $client,  "$reply\n", $userinput);
+     } else {
+ 	&Failure( $client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
+ #  Process the editing script for a table edit operation.
+ #  the editing operation must be encrypted and requested by
+ #  a manager host.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ #  Implicit output:
+ #     a reply is sent to the client.
+ #
+ sub edit_table_handler {
+     my ($command, $tail, $client) = @_;
+     my $userinput = "$command:$tail";
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	my($filetype, $script) = split(/:/, $tail);
+ 	if (($filetype eq "hosts") ||
+ 	    ($filetype eq "domain")) {
+ 	    if($script ne "") {
+ 		&Reply($client,              # BUGBUG - EditFile
+ 		      &EditFile($userinput), #   could fail.
+ 		      $userinput);
+ 	    } else {
+ 		&Failure($client,"refused\n",$userinput);
+ 	    }
+ 	} else {
+ 	    &Failure($client,"refused\n",$userinput);
+ 	}
+     } else {
+ 	&Failure($client,"refused\n",$userinput);
+     }
+     return 1;
+ }
+ register_handler("edit", \&edit_table_handler, 1, 0, 1);
+ #
+ #   Authenticate a user against the LonCAPA authentication
+ #   database.  Note that there are several authentication
+ #   possibilities:
+ #   - unix     - The user can be authenticated against the unix
+ #                password file.
+ #   - internal - The user can be authenticated against a purely
+ #                internal per user password file.
+ #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
+ #                ticket granting authority.
+ #   - user     - The person tailoring LonCAPA can supply a user authentication
+ #                mechanism that is per system.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub authenticate_handler {
+     my ($cmd, $tail, $client) = @_;
+     #  Regenerate the full input line
+     my $userinput  = $cmd.":".$tail;
+     #  udom    - User's domain.
+     #  uname   - Username.
+     #  upass   - User's password.
+     my ($udom,$uname,$upass)=split(/:/,$tail);
+     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
+     chomp($upass);
+     $upass=&unescape($upass);
+     my $pwdcorrect = &validate_user($udom, $uname, $upass);
+     if($pwdcorrect) {
+ 	&Reply( $client, "authorized\n", $userinput);
+ 	#
+ 	#  Bad credentials: Failed to authorize
+ 	#
+     } else {
+ 	&Failure( $client, "non_authorized\n", $userinput);
+     }
+     return 1;
+ }
+ register_handler("auth", \&authenticate_handler, 1, 1, 0);
+ #
+ #   Change a user's password.  Note that this function is complicated by
+ #   the fact that a user may be authenticated in more than one way:
+ #   At present, we are not able to change the password for all types of
+ #   authentication methods.  Only for:
+ #      unix    - unix password or shadow passoword style authentication.
+ #      local   - Locally written authentication mechanism.
+ #   For now, kerb4 and kerb5 password changes are not supported and result
+ #   in an error.
+ # FUTURE WORK:
+ #    Support kerberos passwd changes?
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ sub change_password_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
+     #
+     #  udom  - user's domain.
+     #  uname - Username.
+     #  upass - Current password.
+     #  npass - New password.
+     my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
+     $upass=&unescape($upass);
+     $npass=&unescape($npass);
+     &Debug("Trying to change password for $uname");
+     # First require that the user can be authenticated with their
+     # old password:
+     my $validated = &validate_user($udom, $uname, $upass);
+     if($validated) {
+ 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
+ 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
+ 	if ($howpwd eq 'internal') {
+ 	    &Debug("internal auth");
+ 	    my $salt=time;
+ 	    $salt=substr($salt,6,2);
+ 	    my $ncpass=crypt($npass,$salt);
+ 	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
+ 		&logthis("Result of password change for "
+ 			 ."$uname: pwchange_success");
+ 		&Reply($client, "ok\n", $userinput);
+ 	    } else {
+ 		&logthis("Unable to open $uname passwd "
+ 			 ."to change password");
+ 		&Failure( $client, "non_authorized\n",$userinput);
+ 	    }
+ 	} elsif ($howpwd eq 'unix') {
+ 	    # Unix means we have to access /etc/password
+ 	    &Debug("auth is unix");
+ 	    my $execdir=$perlvar{'lonDaemons'};
+ 	    &Debug("Opening lcpasswd pipeline");
+ 	    my $pf = IO::File->new("|$execdir/lcpasswd > "
+ 				   ."$perlvar{'lonDaemons'}"
+ 				   ."/logs/lcpasswd.log");
+ 	    print $pf "$uname\n$npass\n$npass\n";
+ 	    close $pf;
+ 	    my $err = $?;
+ 	    my $result = ($err>0 ? 'pwchange_failure' : 'ok');
+ 	    &logthis("Result of password change for $uname: ".
+ 		     &lcpasswdstrerror($?));
+ 	    &Reply($client, "$result\n", $userinput);
+ 	} else {
+ 	    # 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", $userinput);
+ 	} else {
+ 	    my @fpparts=split(/\//,$passfilename);
+ 	    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
+ 	    my $fperror='';
+ 	    for (my $i=3;$i<= ($#fpparts-1);$i++) {
+ 		$fpnow.='/'.$fpparts[$i];
+ 		unless (-e $fpnow) {
+ 		    &logthis("mkdir $fpnow");
+ 		    unless (mkdir($fpnow,0777)) {
+ 			$fperror="error: ".($!+0)." mkdir failed while attempting "
+ 			    ."makeuser";
+ 		    }
+ 		}
+ 	    }
+ 	    unless ($fperror) {
+ 		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
+ 		&Reply($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).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub change_authentication_handler {
+     my ($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 $passfilename = &password_path($udom, $uname);
+ 	if ($passfilename) {	# Not allowed to create a new user!!
+ 	    my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
+ 	    &Reply($client, $result, $userinput);
+ 	} else {
+ 	    &Failure($client, "non_authorized", $userinput); # Fail the user now.
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
+ #
+ #   Determines if this is the home server for a user.  The home server
+ #   for a user will have his/her lon-capa passwd file.  Therefore all we need
+ #   to do is determine if this file exists.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub is_home_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = "$cmd:$tail";
+     my ($udom,$uname)=split(/:/,$tail);
+     chomp($uname);
+     my $passfile = &password_filename($udom, $uname);
+     if($passfile) {
+ 	&Reply( $client, "found\n", $userinput);
+     } else {
+ 	&Failure($client, "not_found\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("home", \&is_home_handler, 0,1,0);
+ #
+ #   Process an update request for a resource?? I think what's going on here is
+ #   that a resource has been modified that we hold a subscription to.
+ #   If the resource is not local, then we must update, or at least invalidate our
+ #   cached copy of the resource.
+ #   FUTURE WORK:
+ #      I need to look at this logic carefully.  My druthers would be to follow
+ #      typical caching logic, and simple invalidate the cache, drop any subscription
+ #      an let the next fetch start the ball rolling again... however that may
+ #      actually be more difficult than it looks given the complex web of
+ #      proxy servers.
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub update_resource_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $fname= $tail;		# This allows interactive testing
+     my $ownership=ishome($fname);
+     if ($ownership eq 'not_owner') {
+ 	if (-e $fname) {
+ 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
+ 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
+ 	    my $now=time;
+ 	    my $since=$now-$atime;
+ 	    if ($since>$perlvar{'lonExpire'}) {
+ 		my $reply=&reply("unsub:$fname","$clientname");
+ 		unlink("$fname");
+ 	    } else {
+ 		my $transname="$fname.in.transfer";
+ 		my $remoteurl=&reply("sub:$fname","$clientname");
+ 		my $response;
+ 		alarm(120);
+ 		{
+ 		    my $ua=new LWP::UserAgent;
+ 		    my $request=new HTTP::Request('GET',"$remoteurl");
+ 		    $response=$ua->request($request,$transname);
+ 		}
+ 		alarm(0);
+ 		if ($response->is_error()) {
+ 		    unlink($transname);
+ 		    my $message=$response->status_line;
+ 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
+ 		} else {
+ 		    if ($remoteurl!~/\.meta$/) {
+ 			alarm(120);
+ 			{
+ 			    my $ua=new LWP::UserAgent;
+ 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
+ 			    my $mresponse=$ua->request($mrequest,$fname.'.meta');
+ 			    if ($mresponse->is_error()) {
+ 				unlink($fname.'.meta');
+ 			    }
+ 			}
+ 			alarm(0);
+ 		    }
+ 		    rename($transname,$fname);
+ 		}
+ 	    }
+ 	    &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);
+ #
+ #   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)=split(/\//,$fname);
+     my $udir=&propath($udom,$uname).'/userfiles';
+     unless (-e $udir) {
+ 	mkdir($udir,0770);
+     }
+     if (-e $udir) {
+ 	$ufile=~s/^[\.\~]+//;
+ 	$ufile=~s/\///g;
+ 	my $destname=$udir.'/'.$ufile;
+ 	my $transname=$udir.'/'.$ufile.'.in.transit';
+ 	my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
+ 	my $response;
+ 	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", $userinput);
+ 	} else {
+ 	    if (!rename($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) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     &logthis("$udom - $uname - $ufile");
+     if ($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 $file) {
+ 		unlink($file);
+ 		if (-e $file) {
+ 		    &Failure($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);
+ #---------------------------------------------------------------
+ #
+ #   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 $wasenc    = 0;		# True if request was encrypted.
+ # ------------------------------------------------------------ See if encrypted
+     if ($userinput =~ /^enc/) {
+ 	$userinput = decipher($userinput);
+ 	$wasenc=1;
+ 	if(!$userinput) {	# Cipher not defined.
+ 	    &Failure($client, "error: Encrypted data without negotated key");
+ 	    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;
+ 	}
+     }
+ #------------------- Commands not yet in spearate handlers. --------------
+ # ------------------------------------------ authenticate access to a user file
+     if ($userinput =~ /^tokenauthuserfile/) { # Client only
+ 	if(isClient) {
+ 	    my ($cmd,$fname,$session)=split(/:/,$userinput);
+ 	    chomp($session);
+ 	    my $reply='non_auth';
+ 	    if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
+ 		     $session.'.id')) {
+ 		while (my $line=<ENVIN>) {
+ 		    if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
+ 			    }
+ 		close(ENVIN);
+ 		print $client $reply."\n";
+ 	    } else {
+ 		print $client "invalid_token\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------------------------------- unsubscribe
+     } elsif ($userinput =~ /^unsub/) {
+ 	if(isClient) {
+ 	    my ($cmd,$fname)=split(/:/,$userinput);
+ 	    if (-e $fname) {
+ 		print $client &unsub($fname,$clientip);
+ 	    } else {
+ 		print $client "not_found\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------- subscribe
+     } elsif ($userinput =~ /^sub/) {
+ 	if(isClient) {
+ 	    print $client &subscribe($userinput,$clientip);
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------- current version
+     } elsif ($userinput =~ /^currentversion/) {
+ 	if(isClient) {
+ 	    my ($cmd,$fname)=split(/:/,$userinput);
+ 	    print $client &currentversion($fname)."\n";
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------------- log
+     } elsif ($userinput =~ /^log/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
+ 	    chomp($what);
+ 	    my $proname=propath($udom,$uname);
+ 	    my $now=time;
+ 	    {
+ 		my $hfh;
+ 		if ($hfh=IO::File->new(">>$proname/activity.log")) {
+ 		    print $hfh "$now:$clientname:$what\n";
+ 		    print $client "ok\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." IO::File->new Failed "
+ 			."while attempting log\n";
+ 		}
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------------- put
+     } elsif ($userinput =~ /^put/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$what)
+ 		=split(/:/,$userinput,5);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    if ($namespace ne 'roles') {
+ 		chomp($what);
+ 		my $proname=propath($udom,$uname);
+ 		my $now=time;
+ 		my @pairs=split(/\&/,$what);
+ 		my %hash;
+ 		if (tie(%hash,'GDBM_File',
+ 			"$proname/$namespace.db",
+ 			&GDBM_WRCREAT(),0640)) {
+ 		    unless ($namespace=~/^nohist\_/) {
+ 			my $hfh;
+ 			if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
+ 		    }
+ 		    foreach my $pair (@pairs) {
+ 			my ($key,$value)=split(/=/,$pair);
+ 			$hash{$key}=$value;
+ 		    }
+ 		    if (untie(%hash)) {
+ 			print $client "ok\n";
+ 		    } else {
+ 			print $client "error: ".($!+0)
+ 			    ." untie(GDBM) failed ".
+ 			    "while attempting put\n";
+ 		    }
+ 		} else {
+ 		    print $client "error: ".($!)
+ 			." tie(GDBM) Failed ".
+ 			"while attempting put\n";
+ 		}
+ 	    } else {
+ 		print $client "refused\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------- inc
+     } elsif ($userinput =~ /^inc:/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$what)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    if ($namespace ne 'roles') {
+ 		chomp($what);
+ 		my $proname=propath($udom,$uname);
+ 		my $now=time;
+ 		my @pairs=split(/\&/,$what);
+ 		my %hash;
+ 		if (tie(%hash,'GDBM_File',
+ 			"$proname/$namespace.db",
+ 			&GDBM_WRCREAT(),0640)) {
+ 		    unless ($namespace=~/^nohist\_/) {
+ 			my $hfh;
+ 			if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
+ 		    }
+ 		    foreach my $pair (@pairs) {
+ 			my ($key,$value)=split(/=/,$pair);
+ 			# We could check that we have a number...
+ 			if (! defined($value) || $value eq '') {
+ 			    $value = 1;
+ 			}
+ 			$hash{$key}+=$value;
+ 		    }
+ 		    if (untie(%hash)) {
+ 			print $client "ok\n";
+ 		    } else {
+ 			print $client "error: ".($!+0)
+ 			    ." untie(GDBM) failed ".
+ 			    "while attempting inc\n";
+ 		    }
+ 		} else {
+ 		    print $client "error: ".($!)
+ 			." tie(GDBM) Failed ".
+ 			"while attempting inc\n";
+ 		}
+ 	    } else {
+ 		print $client "refused\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # -------------------------------------------------------------------- rolesput
+     } elsif ($userinput =~ /^rolesput/) {
+ 	if(isClient) {
+ 	    &Debug("rolesput");
+ 	    if ($wasenc==1) {
+ 		my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
+ 		    =split(/:/,$userinput);
+ 		&Debug("cmd = ".$cmd." exedom= ".$exedom.
+ 		       "user = ".$exeuser." udom=".$udom.
+ 		       "what = ".$what);
+ 		my $namespace='roles';
+ 		chomp($what);
+ 		my $proname=propath($udom,$uname);
+ 		my $now=time;
+ 		my @pairs=split(/\&/,$what);
+ 		my %hash;
+ 		if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
+ 		    {
+ 			my $hfh;
+ 			if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
+ 			    print $hfh "P:$now:$exedom:$exeuser:$what\n";
+ 			}
+ 		    }
+ 		    foreach my $pair (@pairs) {
+ 			my ($key,$value)=split(/=/,$pair);
+ 			&ManagePermissions($key, $udom, $uname,
+ 					   &get_auth_type( $udom,
+ 							 $uname));
+ 			$hash{$key}=$value;
+ 		    }
+ 		    if (untie(%hash)) {
+ 			print $client "ok\n";
+ 		    } else {
+ 			print $client "error: ".($!+0)
+ 			    ." untie(GDBM) Failed ".
+ 			    "while attempting rolesput\n";
+ 		    }
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." tie(GDBM) Failed ".
+ 			"while attempting rolesput\n";
+ 			    }
+ 	    } else {
+ 		print $client "refused\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # -------------------------------------------------------------------- rolesdel
+     } elsif ($userinput =~ /^rolesdel/) {
+ 	if(isClient) {
+ 	    &Debug("rolesdel");
+ 	    if ($wasenc==1) {
+ 		my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
+ 		    =split(/:/,$userinput);
+ 		&Debug("cmd = ".$cmd." exedom= ".$exedom.
+ 		       "user = ".$exeuser." udom=".$udom.
+ 		       "what = ".$what);
+ 		my $namespace='roles';
+ 		chomp($what);
+ 		my $proname=propath($udom,$uname);
+ 		my $now=time;
+ 		my @rolekeys=split(/\&/,$what);
+ 		my %hash;
+ 		if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
+ 		    {
+ 			my $hfh;
+ 			if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
+ 			    print $hfh "D:$now:$exedom:$exeuser:$what\n";
+ 			}
+ 		    }
+ 		    foreach my $key (@rolekeys) {
+ 			delete $hash{$key};
+ 		    }
+ 		    if (untie(%hash)) {
+ 			print $client "ok\n";
+ 		    } else {
+ 			print $client "error: ".($!+0)
+ 			    ." untie(GDBM) Failed ".
+ 			    "while attempting rolesdel\n";
+ 		    }
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." tie(GDBM) Failed ".
+ 			"while attempting rolesdel\n";
+ 		}
+ 	    } else {
+ 		print $client "refused\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------------- get
+     } elsif ($userinput =~ /^get/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$what)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    chomp($what);
+ 	    my @queries=split(/\&/,$what);
+ 	    my $proname=propath($udom,$uname);
+ 	    my $qresult='';
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
+ 		for (my $i=0;$i<=$#queries;$i++) {
+ 		    $qresult.="$hash{$queries[$i]}&";
+ 		}
+ 		if (untie(%hash)) {
+ 		    $qresult=~s/\&$//;
+ 		    print $client "$qresult\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting get\n";
+ 		}
+ 	    } else {
+ 		if ($!+0 == 2) {
+ 		    print $client "error:No such file or ".
+ 			"GDBM reported bad block error\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." tie(GDBM) Failed ".
+ 			"while attempting get\n";
+ 		}
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------------ eget
+     } elsif ($userinput =~ /^eget/) {
+ 	if (isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$what)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    chomp($what);
+ 	    my @queries=split(/\&/,$what);
+ 	    my $proname=propath($udom,$uname);
+ 	    my $qresult='';
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
+ 		for (my $i=0;$i<=$#queries;$i++) {
+ 		    $qresult.="$hash{$queries[$i]}&";
+ 		}
+ 		if (untie(%hash)) {
+ 		    $qresult=~s/\&$//;
+ 		    if ($cipher) {
+ 			my $cmdlength=length($qresult);
+ 			$qresult.="         ";
+ 			my $encqresult='';
+ 			for
+ 			    (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+ 				$encqresult.=
+ 				    unpack("H16",
+ 					   $cipher->encrypt(substr($qresult,$encidx,8)));
+ 			    }
+ 			print $client "enc:$cmdlength:$encqresult\n";
+ 		    } else {
+ 			print $client "error:no_key\n";
+ 		    }
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting eget\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting eget\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------------- del
+     } elsif ($userinput =~ /^del/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$what)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    chomp($what);
+ 	    my $proname=propath($udom,$uname);
+ 	    my $now=time;
+ 	    my @keys=split(/\&/,$what);
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
+ 		unless ($namespace=~/^nohist\_/) {
+ 		    my $hfh;
+ 		    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "D:$now:$what\n"; }
+ 		}
+ 		foreach my $key (@keys) {
+ 		    delete($hash{$key});
+ 		}
+ 		if (untie(%hash)) {
+ 		    print $client "ok\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting del\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting del\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------------ keys
+     } elsif ($userinput =~ /^keys/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    my $proname=propath($udom,$uname);
+ 	    my $qresult='';
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
+ 		foreach my $key (keys %hash) {
+ 		    $qresult.="$key&";
+ 		}
+ 		if (untie(%hash)) {
+ 		    $qresult=~s/\&$//;
+ 		    print $client "$qresult\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting keys\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting keys\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------------------------------- dumpcurrent
+     } elsif ($userinput =~ /^currentdump/) {
+ 	if (isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    my $qresult='';
+ 	    my $proname=propath($udom,$uname);
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',
+ 		    "$proname/$namespace.db",
+ 		    &GDBM_READER(),0640)) {
+ 			    # Structure of %data:
+ 		# $data{$symb}->{$parameter}=$value;
+ 		# $data{$symb}->{'v.'.$parameter}=$version;
+ 		# since $parameter will be unescaped, we do not
+ 		# have to worry about silly parameter names...
+ 		my %data = ();
+ 		while (my ($key,$value) = each(%hash)) {
+ 		    my ($v,$symb,$param) = split(/:/,$key);
+ 		    next if ($v eq 'version' || $symb eq 'keys');
+ 		    next if (exists($data{$symb}) &&
+ 			     exists($data{$symb}->{$param}) &&
+ 			     $data{$symb}->{'v.'.$param} > $v);
+ 		    $data{$symb}->{$param}=$value;
+ 		    $data{$symb}->{'v.'.$param}=$v;
+ 		}
+ 		if (untie(%hash)) {
+ 		    while (my ($symb,$param_hash) = each(%data)) {
+ 			while(my ($param,$value) = each (%$param_hash)){
+ 			    next if ($param =~ /^v\./);
+ 			    $qresult.=$symb.':'.$param.'='.$value.'&';
+ 			}
+ 		    }
+ 		    chop($qresult);
+ 		    print $client "$qresult\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting currentdump\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting currentdump\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------------ dump
+     } elsif ($userinput =~ /^dump/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$regexp)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    if (defined($regexp)) {
+ 		$regexp=&unescape($regexp);
+ 	    } else {
+ 		$regexp='.';
+ 	    }
+ 	    my $qresult='';
+ 	    my $proname=propath($udom,$uname);
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
+ 		while (my ($key,$value) = each(%hash)) {
+ 		    if ($regexp eq '.') {
+ 			$qresult.=$key.'='.$value.'&';
+ 		    } else {
+ 			my $unescapeKey = &unescape($key);
+ 			if (eval('$unescapeKey=~/$regexp/')) {
+ 			    $qresult.="$key=$value&";
+ 			}
+ 		    }
+ 		}
+ 		if (untie(%hash)) {
+ 		    chop($qresult);
+ 		    print $client "$qresult\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting dump\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting dump\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------------------------------------- store
+     } elsif ($userinput =~ /^store/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$rid,$what)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    if ($namespace ne 'roles') {
+ 		chomp($what);
+ 		my $proname=propath($udom,$uname);
+ 		my $now=time;
+ 		my @pairs=split(/\&/,$what);
+ 		my %hash;
+ 		if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
+ 		    unless ($namespace=~/^nohist\_/) {
+ 			my $hfh;
+ 			if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
+ 			    print $hfh "P:$now:$rid:$what\n";
+ 			}
+ 		    }
+ 		    my @previouskeys=split(/&/,$hash{"keys:$rid"});
+ 		    my $key;
+ 		    $hash{"version:$rid"}++;
+ 		    my $version=$hash{"version:$rid"};
+ 		    my $allkeys='';
+ 		    foreach my $pair (@pairs) {
+ 			my ($key,$value)=split(/=/,$pair);
+ 			$allkeys.=$key.':';
+ 			$hash{"$version:$rid:$key"}=$value;
+ 		    }
+ 		    $hash{"$version:$rid:timestamp"}=$now;
+ 		    $allkeys.='timestamp';
+ 		    $hash{"$version:keys:$rid"}=$allkeys;
+ 		    if (untie(%hash)) {
+ 			print $client "ok\n";
+ 		    } else {
+ 			print $client "error: ".($!+0)
+ 			    ." untie(GDBM) Failed ".
+ 			    "while attempting store\n";
+ 				}
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." tie(GDBM) Failed ".
+ 			"while attempting store\n";
+ 		}
+ 	    } else {
+ 		print $client "refused\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # --------------------------------------------------------------------- restore
+     } elsif ($userinput =~ /^restore/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$uname,$namespace,$rid)
+ 		=split(/:/,$userinput);
+ 	    $namespace=~s/\//\_/g;
+ 	    $namespace=~s/\W//g;
+ 	    chomp($rid);
+ 	    my $proname=propath($udom,$uname);
+ 	    my $qresult='';
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
+ 		my $version=$hash{"version:$rid"};
+ 		$qresult.="version=$version&";
+ 		my $scope;
+ 		for ($scope=1;$scope<=$version;$scope++) {
+ 		    my $vkeys=$hash{"$scope:keys:$rid"};
+ 		    my @keys=split(/:/,$vkeys);
+ 		    my $key;
+ 		    $qresult.="$scope:keys=$vkeys&";
+ 		    foreach $key (@keys) {
+ 			$qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
+ 		    }
+ 		}
+ 		if (untie(%hash)) {
+ 		    $qresult=~s/\&$//;
+ 		    print $client "$qresult\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting restore\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting restore\n";
+ 	    }
+ 	} else  {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # -------------------------------------------------------------------- chatsend
+     } elsif ($userinput =~ /^chatsend/) {
+ 	if(isClient) {
+ 	    my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
+ 	    &chatadd($cdom,$cnum,$newpost);
+ 	    print $client "ok\n";
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # -------------------------------------------------------------------- chatretr
+     } elsif ($userinput =~ /^chatretr/) {
+ 	if(isClient) {
+ 	    my
+ 		($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
+ 	    my $reply='';
+ 	    foreach (&getchat($cdom,$cnum,$udom,$uname)) {
+ 		$reply.=&escape($_).':';
+ 	    }
+ 	    $reply=~s/\:$//;
+ 	    print $client $reply."\n";
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------- querysend
+     } elsif ($userinput =~ /^querysend/) {
+ 	if (isClient) {
+ 	    my ($cmd,$query,
+ 		$arg1,$arg2,$arg3)=split(/\:/,$userinput);
+ 	    $query=~s/\n*$//g;
+ 	    print $client "".
+ 		sqlreply("$clientname\&$query".
+ 			 "\&$arg1"."\&$arg2"."\&$arg3")."\n";
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------ queryreply
+     } elsif ($userinput =~ /^queryreply/) {
+ 	if(isClient) {
+ 	    my ($cmd,$id,$reply)=split(/:/,$userinput);
+ 	    my $store;
+ 	    my $execdir=$perlvar{'lonDaemons'};
+ 	    if ($store=IO::File->new(">$execdir/tmp/$id")) {
+ 		$reply=~s/\&/\n/g;
+ 		print $store $reply;
+ 		close $store;
+ 		my $store2=IO::File->new(">$execdir/tmp/$id.end");
+ 		print $store2 "done\n";
+ 		close $store2;
+ 		print $client "ok\n";
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." IO::File->new Failed ".
+ 		    "while attempting queryreply\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------------------------------- courseidput
+     } elsif ($userinput =~ /^courseidput/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$what)=split(/:/,$userinput);
+ 	    chomp($what);
+ 			$udom=~s/\W//g;
+ 	    my $proname=
+ 		"$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
+ 	    my $now=time;
+ 	    my @pairs=split(/\&/,$what);
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
+ 		foreach my $pair (@pairs) {
+ 		    my ($key,$descr,$inst_code)=split(/=/,$pair);
+ 		    $hash{$key}=$descr.':'.$inst_code.':'.$now;
+ 		}
+ 		if (untie(%hash)) {
+ 		    print $client "ok\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting courseidput\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting courseidput\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ---------------------------------------------------------------- courseiddump
+     } elsif ($userinput =~ /^courseiddump/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$since,$description)
+ 		=split(/:/,$userinput);
+ 	    if (defined($description)) {
+ 		$description=&unescape($description);
+ 	    } else {
+ 		$description='.';
+ 	    }
+ 	    unless (defined($since)) { $since=0; }
+ 	    my $qresult='';
+ 	    my $proname=
+ 		"$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
+ 		while (my ($key,$value) = each(%hash)) {
+ 		    my ($descr,$lasttime,$inst_code);
+ 		    if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
+ 			($descr,$inst_code,$lasttime)=($1,$2,$3);
+ 		    } else {
+ 			($descr,$lasttime) = split(/\:/,$value);
+ 		    }
+ 		    if ($lasttime<$since) { next; }
+ 		    if ($description eq '.') {
+ 			$qresult.=$key.'='.$descr.':'.$inst_code.'&';
+ 		    } else {
+ 			my $unescapeVal = &unescape($descr);
+ 			if (eval('$unescapeVal=~/\Q$description\E/i')) {
+ 			    $qresult.=$key.'='.$descr.':'.$inst_code.'&';
+ 			}
+ 		    }
+ 		}
+ 		if (untie(%hash)) {
+ 		    chop($qresult);
+ 		    print $client "$qresult\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting courseiddump\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting courseiddump\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------------------------------------- idput
+     } elsif ($userinput =~ /^idput/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$what)=split(/:/,$userinput);
+ 	    chomp($what);
+ 	    $udom=~s/\W//g;
+ 	    my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
+ 	    my $now=time;
+ 	    my @pairs=split(/\&/,$what);
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
+ 		{
+ 		    my $hfh;
+ 		    if ($hfh=IO::File->new(">>$proname.hist")) {
+ 			print $hfh "P:$now:$what\n";
+ 		    }
+ 		}
+ 		foreach my $pair (@pairs) {
+ 		    my ($key,$value)=split(/=/,$pair);
+ 		    $hash{$key}=$value;
+ 		}
+ 		if (untie(%hash)) {
+ 		    print $client "ok\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting idput\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting idput\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------------------------------------- idget
+     } elsif ($userinput =~ /^idget/) {
+ 	if(isClient) {
+ 	    my ($cmd,$udom,$what)=split(/:/,$userinput);
+ 	    chomp($what);
+ 	    $udom=~s/\W//g;
+ 	    my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
+ 	    my @queries=split(/\&/,$what);
+ 	    my $qresult='';
+ 	    my %hash;
+ 	    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
+ 		for (my $i=0;$i<=$#queries;$i++) {
+ 		    $qresult.="$hash{$queries[$i]}&";
+ 		}
+ 		if (untie(%hash)) {
+ 		    $qresult=~s/\&$//;
+ 		    print $client "$qresult\n";
+ 		} else {
+ 		    print $client "error: ".($!+0)
+ 			." untie(GDBM) Failed ".
+ 			"while attempting idget\n";
+ 		}
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ." tie(GDBM) Failed ".
+ 		    "while attempting idget\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ---------------------------------------------------------------------- tmpput
+     } elsif ($userinput =~ /^tmpput/) {
+ 	if(isClient) {
+ 	    my ($cmd,$what)=split(/:/,$userinput);
+ 	    my $store;
+ 	    $tmpsnum++;
+ 	    my $id=$$.'_'.$clientip.'_'.$tmpsnum;
+ 	    $id=~s/\W/\_/g;
+ 	    $what=~s/\n//g;
+ 	    my $execdir=$perlvar{'lonDaemons'};
+ 	    if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
+ 		print $store $what;
+ 		close $store;
+ 		print $client "$id\n";
+ 	    }
+ 	    else {
+ 		print $client "error: ".($!+0)
+ 		    ."IO::File->new Failed ".
+ 		    "while attempting tmpput\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ---------------------------------------------------------------------- tmpget
+     } elsif ($userinput =~ /^tmpget/) {
+ 	if(isClient) {
+ 	    my ($cmd,$id)=split(/:/,$userinput);
+ 	    chomp($id);
+ 	    $id=~s/\W/\_/g;
+ 	    my $store;
+ 	    my $execdir=$perlvar{'lonDaemons'};
+ 	    if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
+ 		my $reply=<$store>;
+ 			    print $client "$reply\n";
+ 		close $store;
+ 	    }
+ 	    else {
+ 		print $client "error: ".($!+0)
+ 		    ."IO::File->new Failed ".
+ 		    "while attempting tmpget\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ---------------------------------------------------------------------- tmpdel
+     } elsif ($userinput =~ /^tmpdel/) {
+ 	if(isClient) {
+ 	    my ($cmd,$id)=split(/:/,$userinput);
+ 	    chomp($id);
+ 	    $id=~s/\W/\_/g;
+ 	    my $execdir=$perlvar{'lonDaemons'};
+ 	    if (unlink("$execdir/tmp/$id.tmp")) {
+ 		print $client "ok\n";
+ 	    } else {
+ 		print $client "error: ".($!+0)
+ 		    ."Unlink tmp Failed ".
+ 		    "while attempting tmpdel\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------- portfolio directory list (portls)
+     } elsif ($userinput =~ /^portls/) {
+ 	if(isClient) {
+ 	    my ($cmd,$uname,$udom)=split(/:/,$userinput);
+ 	    my $udir=propath($udom,$uname).'/userfiles/portfolio';
+ 	    my $dirLine='';
+ 	    my $dirContents='';
+ 	    if (opendir(LSDIR,$udir.'/')){
+ 		while ($dirLine = readdir(LSDIR)){
+ 		    $dirContents = $dirContents.$dirLine.'<br />';
+ 		}
+ 	    } else {
+ 		$dirContents = "No directory found\n";
+ 	    }
+ 	    print $client $dirContents."\n";
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # -------------------------------------------------------------------------- ls
+     } elsif ($userinput =~ /^ls/) {
+ 	if(isClient) {
+ 	    my $obs;
+ 	    my $rights;
+ 	    my ($cmd,$ulsdir)=split(/:/,$userinput);
+ 	    my $ulsout='';
+ 	    my $ulsfn;
+ 	    if (-e $ulsdir) {
+ 		if(-d $ulsdir) {
+ 		    if (opendir(LSDIR,$ulsdir)) {
+ 			while ($ulsfn=readdir(LSDIR)) {
+ 			    undef $obs, $rights;
+ 			    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+ 			    #We do some obsolete checking here
+ 			    if(-e $ulsdir.'/'.$ulsfn.".meta") {
+ 				open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+ 				my @obsolete=<FILE>;
+ 				foreach my $obsolete (@obsolete) {
+ 				    if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
+ 				    if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
+ 				}
+ 			    }
+ 			    $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
+ 			    if($obs eq '1') { $ulsout.="&1"; }
+ 			    else { $ulsout.="&0"; }
+ 			    if($rights eq '1') { $ulsout.="&1:"; }
+ 			    else { $ulsout.="&0:"; }
+ 			}
+ 			closedir(LSDIR);
+ 		    }
+ 		} else {
+ 		    my @ulsstats=stat($ulsdir);
+ 		    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+ 		}
+ 	    } else {
+ 		$ulsout='no_such_dir';
+ 	    }
+ 	    if ($ulsout eq '') { $ulsout='empty'; }
+ 	    print $client "$ulsout\n";
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ----------------------------------------------------------------- setannounce
+     } elsif ($userinput =~ /^setannounce/) {
+ 	if (isClient) {
+ 	    my ($cmd,$announcement)=split(/:/,$userinput);
+ 	    chomp($announcement);
+ 	    $announcement=&unescape($announcement);
+ 	    if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
+ 					'/announcement.txt')) {
+ 		print $store $announcement;
+ 		close $store;
+ 		print $client "ok\n";
+ 	    } else {
+ 		print $client "error: ".($!+0)."\n";
+ 	    }
+ 	} else {
+ 	    Reply($client, "refused\n", $userinput);
+ 	}
+ # ------------------------------------------------------------------ Hanging up
+     } elsif (($userinput =~ /^exit/) ||
+ 	     ($userinput =~ /^init/)) { # no restrictions.
+ 	&logthis(
+ 		 "Client $clientip ($clientname) hanging up: $userinput");
+ 	print $client "bye\n";
+ 	$client->shutdown(2);        # shutdown the socket forcibly.
+ 	$client->close();
+ 	return 0;
+ # ---------------------------------- set current host/domain
+     } elsif ($userinput =~ /^sethost:/) {
+ 	if (isClient) {
+ 	    print $client &sethost($userinput)."\n";
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ #---------------------------------- request file (?) version.
+     } elsif ($userinput =~/^version:/) {
+ 	if (isClient) {
+ 	    print $client &version($userinput)."\n";
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ #------------------------------- is auto-enrollment enabled?
+     } elsif ($userinput =~/^autorun:/) {
+ 	if (isClient) {
+ 	    my ($cmd,$cdom) = split(/:/,$userinput);
+ 	    my $outcome = &localenroll::run($cdom);
+ 	    print $client "$outcome\n";
+ 	} else {
+ 	    print $client "0\n";
+ 	}
+ #------------------------------- get official sections (for auto-enrollment).
+     } elsif ($userinput =~/^autogetsections:/) {
+ 	if (isClient) {
+ 	    my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
+ 	    my @secs = &localenroll::get_sections($coursecode,$cdom);
+ 	    my $seclist = &escape(join(':',@secs));
+ 	    print $client "$seclist\n";
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ #----------------------- validate owner of new course section (for auto-enrollment).
+     } elsif ($userinput =~/^autonewcourse:/) {
+ 	if (isClient) {
+ 	    my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
+ 	    my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
+ 	    print $client "$outcome\n";
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ #-------------- validate course section in schedule of classes (for auto-enrollment).
+     } elsif ($userinput =~/^autovalidatecourse:/) {
+ 	if (isClient) {
+ 	    my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
+ 	    my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
+ 	    print $client "$outcome\n";
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ #--------------------------- create password for new user (for auto-enrollment).
+     } elsif ($userinput =~/^autocreatepassword:/) {
+ 	if (isClient) {
+ 	    my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
+ 	    my ($create_passwd,$authchk);
+ 	    ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
+ 	    print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ #---------------------------  read and remove temporary files (for auto-enrollment).
+     } elsif ($userinput =~/^autoretrieve:/) {
+ 	if (isClient) {
+ 	    my ($cmd,$filename) = split(/:/,$userinput);
+ 	    my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
+ 	    if ( (-e $source) && ($filename ne '') ) {
+ 		my $reply = '';
+ 		if (open(my $fh,$source)) {
+ 		    while (<$fh>) {
+ 			chomp($_);
+ 			$_ =~ s/^\s+//g;
+ 			$_ =~ s/\s+$//g;
+ 			$reply .= $_;
+ 		    }
+ 		    close($fh);
+ 		    print $client &escape($reply)."\n";
+ #                                unlink($source);
+ 		} else {
+ 		    print $client "error\n";
+ 		}
+ 	    } else {
+ 		print $client "error\n";
+ 	    }
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ #---------------------  read and retrieve institutional code format (for support form).
+     } elsif ($userinput =~/^autoinstcodeformat:/) {
+ 	if (isClient) {
+ 	    my $reply;
+ 	    my($cmd,$cdom,$course) = split(/:/,$userinput);
+ 	    my @pairs = split/\&/,$course;
+ 	    my %instcodes = ();
+ 	    my %codes = ();
+ 	    my @codetitles = ();
+ 	    my %cat_titles = ();
+ 	    my %cat_order = ();
+ 	    foreach (@pairs) {
+ 		my ($key,$value) = split/=/,$_;
+ 		$instcodes{&unescape($key)} = &unescape($value);
+ 	    }
+ 	    my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
+ 	    if ($formatreply eq 'ok') {
+ 		my $codes_str = &hash2str(%codes);
+ 		my $codetitles_str = &array2str(@codetitles);
+ 		my $cat_titles_str = &hash2str(%cat_titles);
+ 		my $cat_order_str = &hash2str(%cat_order);
+ 		print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
+ 	    }
+ 	} else {
+ 	    print $client "refused\n";
+ 	}
+ # ------------------------------------------------------------- unknown command
+     } else {
+ 	# unknown command
+ 	print $client "unknown_cmd\n";
+     }
+ # -------------------------------------------------------------------- complete
+     Debug("process_request - returning 1");
+     return 1;
+ }
+ #
+ #   Decipher encoded traffic
+ #  Parameters:
+ #     input      - Encoded data.
+ #  Returns:
+ #     Decoded data or undef if encryption key was not yet negotiated.
+ #  Implicit input:
+ #     cipher  - This global holds the negotiated encryption key.
+ #
+ sub decipher {
+     my ($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 758  sub catchexception {
+ Line 3162  sub catchexception {
      $server->close();
      die($error);
  }
  sub timeout {
      &status("Handling Timeout");
      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
- Line 766  sub timeout {
+ Line 3169  sub timeout {
  }
  # -------------------------------- Set signal handlers to record abnormal exits
  $SIG{'QUIT'}=\&catchexception;
  $SIG{__DIE__}=\&catchexception;
- Line 864  sub HUPSMAN {                      # sig
+ Line 3268  sub HUPSMAN {                      # sig
  #
  #    Kill off hashes that describe the host table prior to re-reading it.
  #    Hashes affected are:
- #       %hostid, %hostdom %hostip
+ #       %hostid, %hostdom %hostip %hostdns.
  #
  sub KillHostHashes {
      foreach my $key (keys %hostid) {
- Line 876  sub KillHostHashes {
+ Line 3280  sub KillHostHashes {
      foreach my $key (keys %hostip) {
  	delete $hostip{$key};
      }
+     foreach my $key (keys %hostdns) {
+ 	delete $hostdns{$key};
+     }
  }
  #
  #   Read in the host table from file and distribute it into the various hashes:
- Line 886  sub KillHostHashes {
+ Line 3293  sub KillHostHashes {
  sub ReadHostTable {
      open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
+     my $myloncapaname = $perlvar{'lonHostID'};
+     Debug("My loncapa name is : $myloncapaname");
      while (my $configline=<CONFIG>) {
  	if (!($configline =~ /^\s*\#/)) {
  	    my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
  	    chomp($ip); $ip=~s/\D+$//;
- 	    $hostid{$ip}=$id;
+ 	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
- 	    $hostdom{$id}=$domain;
+ 	    $hostdom{$id}=$domain;    # LonCAPA domain name of host.
- 	    $hostip{$id}=$ip;
+ 	    $hostip{$id}=$ip;	      # IP address of host.
- 	    if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
+ 	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
+ 	    if ($id eq $perlvar{'lonHostID'}) {
+ 		Debug("Found me in the host table: $name");
+ 		$thisserver=$name;
+ 	    }
  	}
      }
      close(CONFIG);
- Line 957  sub checkchildren {
+ Line 3370  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 978  sub checkchildren {
+ Line 3393  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 985  sub checkchildren {
+ Line 3401  sub checkchildren {
      $SIG{ALRM} = 'DEFAULT';
      $SIG{__DIE__} = \&catchexception;
      &status("Finished checking children");
+     &logthis('Finished Checking children');
  }
  # --------------------------------------------------------------------- Logging
- Line 1016  sub Debug {
+ Line 3433  sub Debug {
  #     request - Original request from client.
  #
  sub Reply {
      my ($fd, $reply, $request) = @_;
      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 3472  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(DB,LOCK_UN);
+ 	close(LOG);
+     }
      &status("Finished logging");
  }
- Line 1236  while (1) {
+ Line 3682  while (1) {
  sub make_new_child {
      my $pid;
-     my $cipher;
+ #    my $cipher;     # Now global
      my $sigset;
      $client = shift;
- Line 1265  sub make_new_child {
+ Line 3711  sub make_new_child {
  	&logthis("Unable to determine who caller was, getpeername returned nothing");
      }
      if (defined($iaddr)) {
- 	$clientip=inet_ntoa($iaddr);
+ 	$clientip  = inet_ntoa($iaddr);
+ 	Debug("Connected with $clientip");
+ 	$clientdns = gethostbyaddr($iaddr, AF_INET);
+ 	Debug("Connected with $clientdns by name");
      } else {
- 	&logthis("Unable to determine clinetip");
+ 	&logthis("Unable to determine clientip");
  	$clientip='Unavailable';
      }
- Line 1292  sub make_new_child {
+ Line 3741  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();
- Line 1301  sub make_new_child {
+ Line 3750  sub make_new_child {
  # =============================================================================
              # 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!!
- Line 1319  sub make_new_child {
+ Line 3768  sub make_new_child {
  	    $clientname = $managers{$clientip};
  	}
  	my $clientok;
  	if ($clientrec || $ismanager) {
  	    &status("Waiting for init from $clientip $clientname");
  	    &logthis('<font color="yellow">INFO: Connection, '.
- Line 1326  sub make_new_child {
+ Line 3776  sub make_new_child {
  		  " ($clientname) connection type = $ConnectionType </font>" );
  	    &status("Connecting $clientip  ($clientname))");
  	    my $remotereq=<$client>;
- 	    $remotereq=~s/[^\w:]//g;
+ 	    chomp($remotereq);
+ 	    Debug("Got init: $remotereq");
+ 	    my $inikeyword = split(/:/, $remotereq);
  	    if ($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(
- Line 1349  sub make_new_child {
+ Line 3857  sub make_new_child {
  			 ."$clientip failed to initialize: >$remotereq< </font>");
  		&status('No init '.$clientip);
  	    }
  	} else {
  	    &logthis(
  		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
  	    &status('Hung up on '.$clientip);
  	}
  	if ($clientok) {
  # ---------------- New known client connecting, could mean machine online again
- Line 1368  sub make_new_child {
+ Line 3878  sub make_new_child {
  	    &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:'.$uname.','.
- 						     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
- 					}
- 				    }
- 				}
- 			    } elsif ($howpwd eq 'krb5') {
- 				my $null=pack("C",0);
- 				unless ($upass=~/$null/) {
- 				    my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
- 				    my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
- 				    my $krbserver=&Authen::Krb5::parse_name($krbservice);
- 				    my $credentials=&Authen::Krb5::cc_default();
- 				    $credentials->initialize($krbclient);
- 				    my $krbreturn =
- 					&Authen::Krb5::get_in_tkt_with_password(
- 										$krbclient,$krbserver,$upass,$credentials);
- #				  unless ($krbreturn) {
- #				      &logthis("Krb5 Error: ".
- #					       &Authen::Krb5::error());
- #				  }
- 				    $pwdcorrect = ($krbreturn == 1);
- 				} else { $pwdcorrect=0; }
- 			    } elsif ($howpwd eq 'localauth') {
- 				$pwdcorrect=&localauth::localauth($uname,$upass,
- 								  $contentpwd);
- 			    }
- 			    if ($pwdcorrect) {
- 				print $client "authorized\n";
- 			    } else {
- 				print $client "non_authorized\n";
- 			    }
- 			} else {
- 			    print $client "unknown_user\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- passwd
- 		} elsif ($userinput =~ /^passwd/) { # encoded and client
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
- 			chomp($npass);
- 			$upass=&unescape($upass);
- 			$npass=&unescape($npass);
- 			&Debug("Trying to change password for $uname");
- 			my $proname=propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			if (-e $passfilename) {
- 			    my $realpasswd;
- 			    { my $pf = IO::File->new($passfilename);
- 			      $realpasswd=<$pf>; }
- 			    chomp($realpasswd);
- 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
- 			    if ($howpwd eq 'internal') {
- 				&Debug("internal auth");
- 				if (crypt($upass,$contentpwd) eq $contentpwd) {
- 				    my $salt=time;
- 				    $salt=substr($salt,6,2);
- 				    my $ncpass=crypt($npass,$salt);
- 				    {
- 					my $pf;
- 					if ($pf = IO::File->new(">$passfilename")) {
- 					    print $pf "internal:$ncpass\n";
- 					    &logthis("Result of password change for $uname: pwchange_success");
- 					    print $client "ok\n";
- 					} else {
- 					    &logthis("Unable to open $uname passwd to change password");
- 					    print $client "non_authorized\n";
- 					}
- 				    }
- 				} else {
- 				    print $client "non_authorized\n";
- 				}
- 			    } elsif ($howpwd eq 'unix') {
- 				# Unix means we have to access /etc/password
- 				# one way or another.
- 				# First: Make sure the current password is
- 				#        correct
- 				&Debug("auth is unix");
- 				$contentpwd=(getpwnam($uname))[1];
- 				my $pwdcorrect = "0";
- 				my $pwauth_path="/usr/local/sbin/pwauth";
- 				unless ($contentpwd eq 'x') {
- 				    $pwdcorrect=
- 					(crypt($upass,$contentpwd) eq $contentpwd);
- 				} elsif (-e $pwauth_path) {
- 				    open PWAUTH, "|$pwauth_path" or
- 					die "Cannot invoke authentication";
- 				    print PWAUTH "$uname\n$upass\n";
- 				    close PWAUTH;
- 				    &Debug("exited pwauth with $? ($uname,$upass) ");
- 				    $pwdcorrect=($? == 0);
- 				}
- 				if ($pwdcorrect) {
- 				    my $execdir=$perlvar{'lonDaemons'};
- 				    &Debug("Opening lcpasswd pipeline");
- 				    my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
- 				    print $pf "$uname\n$npass\n$npass\n";
- 				    close $pf;
- 				    my $err = $?;
- 				    my $result = ($err>0 ? 'pwchange_failure'
- 						  : 'ok');
- 				    &logthis("Result of password change for $uname: ".
- 					     &lcpasswdstrerror($?));
- 				    print $client "$result\n";
- 				} else {
- 				    print $client "non_authorized\n";
- 				}
- 			    } else {
- 				print $client "auth_mode_error\n";
- 			    }
- 			} else {
- 			    print $client "unknown_user\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- makeuser
- 		} elsif ($userinput =~ /^makeuser/) { # encoded and client.
- 		    &Debug("Make user received");
- 		    my $oldumask=umask(0077);
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
- 			&Debug("cmd =".$cmd." $udom =".$udom.
- 			       " uname=".$uname);
- 			chomp($npass);
- 			$npass=&unescape($npass);
- 			my $proname=propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			&Debug("Password file created will be:".
- 			       $passfilename);
- 			if (-e $passfilename) {
- 			    print $client "already_exists\n";
- 			} elsif ($udom ne $currentdomainid) {
- 			    print $client "not_right_domain\n";
- 			} else {
- 			    my @fpparts=split(/\//,$proname);
- 			    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
- 			    my $fperror='';
- 			    for (my $i=3;$i<=$#fpparts;$i++) {
- 				$fpnow.='/'.$fpparts[$i];
- 				unless (-e $fpnow) {
- 				    unless (mkdir($fpnow,0777)) {
- 					$fperror="error: ".($!+0)
- 					    ." mkdir failed while attempting "
- 					    ."makeuser";
- 				    }
- 				}
- 			    }
- 			    unless ($fperror) {
- 				my $result=&make_passwd_file($uname, $umode,$npass,
- 							     $passfilename);
- 				print $client $result;
- 			    } else {
- 				print $client "$fperror\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- 		    umask($oldumask);
- # -------------------------------------------------------------- changeuserauth
- 		} elsif ($userinput =~ /^changeuserauth/) { # encoded & client
- 		    &Debug("Changing authorization");
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
- 			chomp($npass);
- 			&Debug("cmd = ".$cmd." domain= ".$udom.
- 			       "uname =".$uname." umode= ".$umode);
- 			$npass=&unescape($npass);
- 			my $proname=&propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			if ($udom ne $currentdomainid) {
- 			    print $client "not_right_domain\n";
- 			} else {
- 			    my $result=&make_passwd_file($uname, $umode,$npass,
- 							 $passfilename);
- 			    print $client $result;
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ home
- 		} elsif ($userinput =~ /^home/) { # client clear or encoded
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
- 			chomp($uname);
- 			my $proname=propath($udom,$uname);
- 			if (-e $proname) {
- 			    print $client "found\n";
- 			} else {
- 			    print $client "not_found\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- update
- 		} elsif ($userinput =~ /^update/) { # client clear or encoded.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my $ownership=ishome($fname);
- 			if ($ownership eq 'not_owner') {
- 			    if (-e $fname) {
- 				my ($dev,$ino,$mode,$nlink,
- 				    $uid,$gid,$rdev,$size,
- 				    $atime,$mtime,$ctime,
- 				    $blksize,$blocks)=stat($fname);
- 				my $now=time;
- 				my $since=$now-$atime;
- 				if ($since>$perlvar{'lonExpire'}) {
- 				    my $reply=
- 					&reply("unsub:$fname","$clientname");
- 				    unlink("$fname");
- 				} else {
- 				    my $transname="$fname.in.transfer";
- 				    my $remoteurl=
- 					&reply("sub:$fname","$clientname");
- 				    my $response;
- 				    {
- 					my $ua=new LWP::UserAgent;
- 					my $request=new HTTP::Request('GET',"$remoteurl");
- 					$response=$ua->request($request,$transname);
- 				    }
- 				    if ($response->is_error()) {
- 					unlink($transname);
- 					my $message=$response->status_line;
- 					&logthis(
- 						 "LWP GET: $message for $fname ($remoteurl)");
- 				    } else {
- 					if ($remoteurl!~/\.meta$/) {
- 					    my $ua=new LWP::UserAgent;
- 					    my $mrequest=
- 						new HTTP::Request('GET',$remoteurl.'.meta');
- 					    my $mresponse=
- 						$ua->request($mrequest,$fname.'.meta');
- 					    if ($mresponse->is_error()) {
- 						unlink($fname.'.meta');
- 					    }
- 					}
- 					rename($transname,$fname);
- 				    }
- 				}
- 				print $client "ok\n";
- 			    } else {
- 				print $client "not_found\n";
- 			    }
- 			} else {
- 			    print $client "rejected\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------- fetch a user file from a remote server
- 		} elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
- 			my $udir=propath($udom,$uname).'/userfiles';
- 			unless (-e $udir) { mkdir($udir,0770); }
- 			if (-e $udir) {
-                             $ufile=~s/^[\.\~]+//;
-                             my $path = $udir;
-                             if ($ufile =~m|(.+)/([^/]+)$|) {
-                                 my @parts=split('/',$1);
-                                 foreach my $part (@parts) {
-                                     $path .= '/'.$part;
-                                     if ((-e $path)!=1) {
-                                         mkdir($path,0770);
-                                     }
-                                 }
-                             }
- 			    my $destname=$udir.'/'.$ufile;
- 			    my $transname=$udir.'/'.$ufile.'.in.transit';
- 			    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
- 			    my $response;
- 			    {
- 				my $ua=new LWP::UserAgent;
- 				my $request=new HTTP::Request('GET',"$remoteurl");
- 				$response=$ua->request($request,$transname);
- 			    }
- 			    if ($response->is_error()) {
- 				unlink($transname);
- 				my $message=$response->status_line;
- 				&logthis("LWP GET: $message for $fname ($remoteurl)");
- 				print $client "failed\n";
- 			    } else {
- 				if (!rename($transname,$destname)) {
- 				    &logthis("Unable to move $transname to $destname");
- 				    unlink($transname);
- 				    print $client "failed\n";
- 				} else {
- 				    print $client "ok\n";
- 				}
- 			    }
- 			} else {
- 			    print $client "not_home\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # --------------------------------------------------------- remove a user file
- 		} elsif ($userinput =~ /^removeuserfile/) { # Client clear or enc.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
- 			&logthis("$udom - $uname - $ufile");
- 			if ($ufile =~m|/\.\./|) {
- 			    # any files paths with /../ in them refuse
-                             # to deal with
- 			    print $client "refused\n";
- 			} else {
- 			    my $udir=propath($udom,$uname);
- 			    if (-e $udir) {
- 				my $file=$udir.'/userfiles/'.$ufile;
- 				if (-e $file) {
- 				    unlink($file);
- 				    if (-e $file) {
- 					print $client "failed\n";
- 				    } else {
- 					print $client "ok\n";
- 				    }
- 				} else {
- 				    print $client "not_found\n";
- 				}
- 			    } else {
- 				print $client "not_home\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------ authenticate access to a user file
- 		} elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
- 		    if(isClient) {
- 			my ($cmd,$fname,$session)=split(/:/,$userinput);
- 			chomp($session);
- 			my $reply='non_auth';
- 			if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
- 				 $session.'.id')) {
- 			    while (my $line=<ENVIN>) {
- 				if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
- 			    }
- 			    close(ENVIN);
- 			    print $client $reply."\n";
- 			} else {
- 			    print $client "invalid_token\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- unsubscribe
- 		} elsif ($userinput =~ /^unsub/) {
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			if (-e $fname) {
- 			    print $client &unsub($fname,$clientip);
- 			} else {
- 			    print $client "not_found\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------- subscribe
- 		} elsif ($userinput =~ /^sub/) {
- 		    if(isClient) {
- 			print $client &subscribe($userinput,$clientip);
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------- current version
- 		} elsif ($userinput =~ /^currentversion/) {
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			print $client &currentversion($fname)."\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- log
- 		} elsif ($userinput =~ /^log/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			my $proname=propath($udom,$uname);
- 			my $now=time;
- 			{
- 			    my $hfh;
- 			    if ($hfh=IO::File->new(">>$proname/activity.log")) {
- 				print $hfh "$now:$clientname:$what\n";
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." IO::File->new Failed "
- 				    ."while attempting log\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- put
- 		} elsif ($userinput =~ /^put/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$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('$unescapeVal=~/\Q$description\E/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";
- 		    }
- #------------------------------- is auto-enrollment enabled?
-                 } elsif ($userinput =~/^autorun/) {
-                     if (isClient) {
-                         my $outcome = &localenroll::run();
-                         print $client "$outcome\n";
-                     } else {
-                         print $client "0\n";
-                     }
- #------------------------------- get official sections (for auto-enrollment).
-                 } elsif ($userinput =~/^autogetsections/) {
-                     if (isClient) {
-                         my ($cmd,$coursecode)=split(/:/,$userinput);
-                         my @secs = &localenroll::get_sections($coursecode);
-                         my $seclist = &escape(join(':',@secs));
-                         print $client "$seclist\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #----------------------- validate owner of new course section (for auto-enrollment).
-                 } elsif ($userinput =~/^autonewcourse/) {
-                     if (isClient) {
-                         my ($cmd,$course_id,$owner)=split(/:/,$userinput);
-                         my $outcome = &localenroll::new_course($course_id,$owner);
-                         print $client "$outcome\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #-------------- validate course section in schedule of classes (for auto-enrollment).
-                 } elsif ($userinput =~/^autovalidatecourse/) {
-                     if (isClient) {
-                         my ($cmd,$course_id)=split(/:/,$userinput);
-                         my $outcome=&localenroll::validate_courseID($course_id);
-                         print $client "$outcome\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #--------------------------- create password for new user (for auto-enrollment).
-                 } elsif ($userinput =~/^autocreatepassword/) {
-                     if (isClient) {
-                         my ($cmd,$authparam)=split(/:/,$userinput);
-                         my ($create_passwd,$authchk) = @_;
-                         ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam);
-                         print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #---------------------------  read and remove temporary files (for auto-enrollment).
-                 } elsif ($userinput =~/^autoretrieve/) {
-                     if (isClient) {
-                         my ($cmd,$filename) = split(/:/,$userinput);
-                         my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
-                         if ( (-e $source) && ($filename ne '') ) {
-                             my $reply = '';
-                             if (open(my $fh,$source)) {
-                                 while (<$fh>) {
-                                     chomp($_);
-                                     $_ =~ s/^\s+//g;
-                                     $_ =~ s/\s+$//g;
-                                     $reply .= $_;
-                                 }
-                                 close($fh);
-                                 print $client &escape($reply)."\n";
- #                                unlink($source);
-                             } else {
-                                 print $client "error\n";
-                             }
-                         } else {
-                             print $client "error\n";
-                         }
-                     } else {
-                         print $client "refused\n";
-                     }
- # ------------------------------------------------------------- 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: "
  		     ."Rejected client $clientip, closing connection</font>");
  	}
      }
  # =============================================================================
- Line 2993  sub ManagePermissions
+ Line 3935  sub ManagePermissions
  	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) = @_;
+     my $path   = &propath($domain, $user);
+     $path  .= "/passwd";
+     return $path;
+ }
+ #   Password Filename
+ #   Returns the path to a passwd file given domain and user... only if
+ #  it exists.
+ # Parameters:
+ #   domain    - Domain in which to search.
+ #   user      - username.
+ # Returns:
+ #   - If the password file exists returns its path.
+ #   - If the password file does not exist, returns undefined.
+ #
+ sub password_filename {
+     my ($domain, $user) = @_;
+     Debug ("PasswordFilename called: dom = $domain user = $user");
+     my $path  = &password_path($domain, $user);
+     Debug("PasswordFilename got path: $path");
+     if(-e $path) {
+ 	return $path;
+     } else {
+ 	return undef;
+     }
+ }
  #
- #   GetAuthType - Determines the authorization type of a user in a domain.
+ #   Rewrite the contents of the user's passwd file.
+ #  Parameters:
+ #    domain    - domain of the user.
+ #    name      - User's name.
+ #    contents  - New contents of the file.
+ # Returns:
+ #   0    - Failed.
+ #   1    - Success.
+ #
+ sub rewrite_password_file {
+     my ($domain, $user, $contents) = @_;
+     my $file = &password_filename($domain, $user);
+     if (defined $file) {
+ 	my $pf = IO::File->new(">$file");
+ 	if($pf) {
+ 	    print $pf "$contents\n";
+ 	    return 1;
+ 	} else {
+ 	    return 0;
+ 	}
+     } else {
+ 	return 0;
+     }
+ }
+ #
+ #   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, $user)  = @_;
-     Debug("GetAuthType( $domain, $user ) \n");
+     Debug("get_auth_type( $domain, $user ) \n");
      my $proname    = &propath($domain, $user);
      my $passwdfile = "$proname/passwd";
      if( -e $passwdfile ) {
- Line 3019  sub GetAuthType
+ Line 4033  sub GetAuthType
  	}
  	return "$authtype:$availinfo";
-     }
+     } else {
-     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.
+     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($krbclient);
+ 		my $krbreturn  = &Authen::KRb5::get_in_tkt_with_password($krbclient,
+ 									 $krbserver,
+ 									 $password,
+ 									 $credentials);
+ 		$validated = ($krbreturn == 1);
+ 	    } else {
+ 		$validated = 0;
+ 	    }
+ 	} elsif ($howpwd eq "localauth") {
+ 	    #  Authenticate via installation specific authentcation method:
+ 	    $validated = &localauth::localauth($user,
+ 					       $password,
+ 					       $contentpwd);
+ 	} else {			# Unrecognized auth is also bad.
+ 	    $validated = 0;
+ 	}
+     } else {
+ 	$validated = 0;
+     }
+     #
+     #  $validated has the correct stat of the authentication:
+     #
+     unless ($validated != -3.14159) {
+ 	die "ValidateUser - failed to set the value of validated";
+     }
+     return $validated;
+ }
  sub addline {
      my ($fname,$hostid,$ip,$newline)=@_;
      my $contents;
- Line 3271  sub make_passwd_file {
+ Line 4404  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 3279  sub make_passwd_file {
+ Line 4414  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 = $?;
+ 	    my $error = IO::File->new("< $lc_error_file");
+ 	    my $useraddok = <$error>;
+ 	    $error->close;
+ 	    unlink($lc_error_file);
+ 	    chomp $useraddok;
  	    if($useraddok > 0) {
- 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
+ 		my $error_text = &lcuseraddstrerror($useraddok);
+ 		&logthis("Failed lcuseradd: $error_text");
+ 		$result = "lcuseradd_failed:$error_text\n";
+ 	    }  else {
+ 		my $pf = IO::File->new(">$passfilename");
+ 		print $pf "unix:\n";
  	    }
- 	    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 $pf "none:\n";
  	}
      } else {
- Line 3303  sub sethost {
+ Line 4448  sub sethost {
      my (undef,$hostid)=split(/:/,$remotereq);
      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
      if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
- 	$currenthostid=$hostid;
+ 	$currenthostid  =$hostid;
  	$currentdomainid=$hostdom{$hostid};
  	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
      } else {
- Line 3343  sub userload {
+ Line 4488  sub userload {
      return $userloadpercent;
  }
+ # Routines for serializing arrays and hashes (copies from lonnet)
+ sub array2str {
+   my (@array) = @_;
+   my $result=&arrayref2str(\@array);
+   $result=~s/^__ARRAY_REF__//;
+   $result=~s/__END_ARRAY_REF__$//;
+   return $result;
+ }
+ sub arrayref2str {
+   my ($arrayref) = @_;
+   my $result='__ARRAY_REF__';
+   foreach my $elem (@$arrayref) {
+     if(ref($elem) eq 'ARRAY') {
+       $result.=&arrayref2str($elem).'&';
+     } elsif(ref($elem) eq 'HASH') {
+       $result.=&hashref2str($elem).'&';
+     } elsif(ref($elem)) {
+       #print("Got a ref of ".(ref($elem))." skipping.");
+     } else {
+       $result.=&escape($elem).'&';
+     }
+   }
+   $result=~s/\&$//;
+   $result .= '__END_ARRAY_REF__';
+   return $result;
+ }
+ sub hash2str {
+   my (%hash) = @_;
+   my $result=&hashref2str(\%hash);
+   $result=~s/^__HASH_REF__//;
+   $result=~s/__END_HASH_REF__$//;
+   return $result;
+ }
+ sub hashref2str {
+   my ($hashref)=@_;
+   my $result='__HASH_REF__';
+   foreach (sort(keys(%$hashref))) {
+     if (ref($_) eq 'ARRAY') {
+       $result.=&arrayref2str($_).'=';
+     } elsif (ref($_) eq 'HASH') {
+       $result.=&hashref2str($_).'=';
+     } elsif (ref($_)) {
+       $result.='=';
+       #print("Got a ref of ".(ref($_))." skipping.");
+     } else {
+         if ($_) {$result.=&escape($_).'=';} else { last; }
+     }
+     if(ref($hashref->{$_}) eq 'ARRAY') {
+       $result.=&arrayref2str($hashref->{$_}).'&';
+     } elsif(ref($hashref->{$_}) eq 'HASH') {
+       $result.=&hashref2str($hashref->{$_}).'&';
+     } elsif(ref($hashref->{$_})) {
+        $result.='&';
+       #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
+     } else {
+       $result.=&escape($hashref->{$_}).'&';
+     }
+   }
+   $result=~s/\&$//;
+   $result .= '__END_HASH_REF__';
+   return $result;
+ }
  # ----------------------------------- POD (plain old documentation, CPAN style)
  =head1 NAME

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