loncom/lond - diff

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Diff for /loncom/lond between versions 1.335 and 1.412

-version 1.335, 2006/06/27 19:01:19
+version 1.412, 2009/03/03 12:08:07
  Line 40  use IO::File;
  use POSIX;
  use Crypt::IDEA;
  use LWP::UserAgent();
+ use Digest::MD5 qw(md5_hex);
  use GDBM_File;
  use Authen::Krb4;
  use Authen::Krb5;
- use lib '/home/httpd/lib/perl/';
  use localauth;
  use localenroll;
  use localstudentphoto;
  use File::Copy;
  use File::Find;
- use LONCAPA::ConfigFileEdit;
  use LONCAPA::lonlocal;
  use LONCAPA::lonssl;
  use Fcntl qw(:flock);
+ use Apache::lonnet;
- my $DEBUG = 0;		       # Non zero to enable debug log entries.
+ my $DEBUG = 1;		       # Non zero to enable debug log entries.
  my $status='';
  my $lastlog='';
  Line 69  my $clientip;   # IP address of client.
  my $clientname;			# LonCAPA name of client.
  my $server;
- my $thisserver;			# DNS of us.
  my $keymode;
- Line 85  my $tmpsnum = 0;  # Id of tmpputs.
+ Line 84  my $tmpsnum = 0;  # Id of tmpputs.
  my $ConnectionType;
- my %hostid;			# ID's for hosts in cluster by ip.
- my %hostdom;			# LonCAPA domain for hosts in cluster.
- my %hostname;			# DNSname -> ID's mapping.
- my %hostip;			# IPs for hosts in cluster.
- my %hostdns;			# ID's of hosts looked up by DNS name.
  my %managers;			# Ip -> manager names
  my %perlvar;			# Will have the apache conf defined perl vars.
- Line 142  my @adderrors    = ("ok",
+ Line 135  my @adderrors    = ("ok",
  		    "lcuseradd Unable to make www member of users's group",
  		    "lcuseradd Unable to su to root",
  		    "lcuseradd Unable to set password",
- 		    "lcuseradd Usrname has invalid characters",
+ 		    "lcuseradd Username has invalid characters",
  		    "lcuseradd Password has an invalid character",
  		    "lcuseradd User already exists",
  		    "lcuseradd Could not add user.",
  		    "lcuseradd Password mismatch");
+ # This array are the errors from lcinstallfile:
+ my @installerrors = ("ok",
+ 		     "Initial user id of client not that of www",
+ 		     "Usage error, not enough command line arguments",
+ 		     "Source file name does not exist",
+ 		     "Destination file name does not exist",
+ 		     "Some file operation failed",
+ 		     "Invalid table filename."
+ 		     );
  #
  #   Statistics that are maintained and dislayed in the status line.
- Line 178  sub ResetStatistics {
+ Line 181  sub ResetStatistics {
  #   $Socket      - Socket open on client.
  #   $initcmd     - The full text of the init command.
  #
- # Implicit inputs:
- #    $thisserver - Our DNS name.
- #
  # Returns:
  #     IDEA session key on success.
  #     undef on failure.
  #
  sub LocalConnection {
      my ($Socket, $initcmd) = @_;
-     Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
+     Debug("Attempting local connection: $initcmd client: $clientip");
      if($clientip ne "127.0.0.1") {
  	&logthis('<font color="red"> LocalConnection rejecting non local: '
- 		 ."$clientip ne $thisserver </font>");
+ 		 ."$clientip ne 127.0.0.1 </font>");
  	close $Socket;
  	return undef;
      }  else {
  Line 408  sub isClient {
  #
  sub ReadManagerTable {
+     &Debug("Reading manager table");
      #   Clean out the old table first..
     foreach my $key (keys %managers) {
- Line 424  sub ReadManagerTable {
+ Line 425  sub ReadManagerTable {
        if ($host =~ "^#") {                  # Comment line.
           next;
        }
-       if (!defined $hostip{$host}) { # This is a non cluster member
+       if (!defined &Apache::lonnet::get_host_ip($host)) { # This is a non cluster member
  	    #  The entry is of the form:
  	    #    cluname:hostname
  	    #  cluname - A 'cluster hostname' is needed in order to negotiate
- Line 442  sub ReadManagerTable {
+ Line 443  sub ReadManagerTable {
           }
        } else {
           logthis('<font color="green"> existing host'." $host</font>\n");
-          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
+          $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
        }
     }
  }
- Line 503  sub AdjustHostContents {
+ Line 504  sub AdjustHostContents {
      my $adjusted;
      my $me        = $perlvar{'lonHostID'};
-  foreach my $line (split(/\n/,$contents)) {
+     foreach my $line (split(/\n/,$contents)) {
  	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
  	    chomp($line);
  	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
  	    if ($id eq $me) {
-           my $ip = gethostbyname($name);
+ 		my $ip = gethostbyname($name);
-           my $ipnew = inet_ntoa($ip);
+ 		my $ipnew = inet_ntoa($ip);
-          $ip = $ipnew;
+ 		$ip = $ipnew;
  		#  Reconstruct the host line and append to adjusted:
- 		   my $newline = "$id:$domain:$role:$name:$ip";
+ 		my $newline = "$id:$domain:$role:$name:$ip";
- 		   if($maxcon ne "") { # Not all hosts have loncnew tuning params
+ 		if($maxcon ne "") { # Not all hosts have loncnew tuning params
- 		     $newline .= ":$maxcon:$idleto:$mincon";
+ 		    $newline .= ":$maxcon:$idleto:$mincon";
- 		   }
+ 		}
- 		   $adjusted .= $newline."\n";
+ 		$adjusted .= $newline."\n";
-       } else {		# Not me, pass unmodified.
+ 	    } else {		# Not me, pass unmodified.
- 		   $adjusted .= $line."\n";
+ 		$adjusted .= $line."\n";
-       }
+ 	    }
  	} else {                  # Blank or comment never re-written.
  	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
  	}
-  }
+     }
-  return $adjusted;
+     return $adjusted;
  }
  #
  #   InstallFile: Called to install an administrative file:
- #       - The file is created with <name>.tmp
+ #       - The file is created int a temp directory called <name>.tmp
- #       - The <name>.tmp file is then mv'd to <name>
+ #       - lcinstall file is called to install the file.
- #   This lugubrious procedure is done to ensure that we are never without
+ #         since the web app has no direct write access to the table directory
- #   a valid, even if dated, version of the file regardless of who crashes
- #   and when the crash occurs.
  #
  #  Parameters:
  #       Name of the file
- Line 542  sub AdjustHostContents {
+ Line 541  sub AdjustHostContents {
  #  Return:
  #      nonzero - success.
  #      0       - failure and $! has an errno.
+ # Assumptions:
+ #    File installtion is a relatively infrequent
  #
  sub InstallFile {
      my ($Filename, $Contents) = @_;
-     my $TempFile = $Filename.".tmp";
+ #     my $TempFile = $Filename.".tmp";
+     my $exedir = $perlvar{'lonDaemons'};
+     my $tmpdir = $exedir.'/tmp/';
+     my $TempFile = $tmpdir."TempTableFile.tmp";
      #  Open the file for write:
- Line 560  sub InstallFile {
+ Line 564  sub InstallFile {
      print $fh ($Contents);
      $fh->close;			# In case we ever have a filesystem w. locking
-     chmod(0660, $TempFile);
+     chmod(0664, $TempFile);	# Everyone can write it.
-     # Now we can move install the file in position.
+     # Use lcinstall file to put the file in the table directory...
-     move($TempFile, $Filename);
+     &Debug("Opening pipe to $exedir/lcinstallfile $TempFile $Filename");
+     my $pf = IO::File->new("| $exedir/lcinstallfile   $TempFile $Filename > $exedir/logs/lcinstallfile.log");
+     close $pf;
+     my $err = $?;
+     &Debug("Status is $err");
+     if ($err != 0) {
+ 	my $msg = $err;
+ 	if ($err < @installerrors) {
+ 	    $msg = $installerrors[$err];
+ 	}
+ 	&logthis("Install failed for table file $Filename : $msg");
+ 	return 0;
+     }
+     # Remove the temp file:
+     unlink($TempFile);
      return 1;
  }
- Line 572  sub InstallFile {
+ Line 592  sub InstallFile {
  #
  #   ConfigFileFromSelector: converts a configuration file selector
- #                 (one of host or domain at this point) into a
+ #                 into a configuration file pathname.
- #                 configuration file pathname.
+ #                 It's probably no longer necessary to preserve
+ #                 special handling of hosts or domain as those
+ #                 files have been superceded by dns_hosts, dns_domain.
+ #                 The default action is just to prepend the directory
+ #                 and append .tab
+ #
  #
  #  Parameters:
  #      selector  - Configuration file selector.
- Line 590  sub ConfigFileFromSelector {
+ Line 615  sub ConfigFileFromSelector {
      } elsif ($selector eq "domain") {
  	$tablefile = $tabledir."domain.tab";
      } else {
- 	return undef;
+ 	$tablefile =  $tabledir.$selector.'.tab';
      }
      return $tablefile;
- Line 613  sub ConfigFileFromSelector {
+ Line 638  sub ConfigFileFromSelector {
  sub PushFile {
      my $request = shift;
      my ($command, $filename, $contents) = split(":", $request, 3);
+     &Debug("PushFile");
      #  At this point in time, pushes for only the following tables are
      #  supported:
- Line 629  sub PushFile {
+ Line 655  sub PushFile {
      if(! (defined $tablefile)) {
  	return "refused";
      }
-     #
-     # >copy< the old table to the backup table
-     #        don't rename in case system crashes/reboots etc. in the time
-     #        window between a rename and write.
-     #
-     my $backupfile = $tablefile;
-     $backupfile    =~ s/\.tab$/.old/;
-     if(!CopyFile($tablefile, $backupfile)) {
- 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
- 	return "error:$!";
-     }
-     &logthis('<font color="green"> Pushfile: backed up '
- 	    .$tablefile." to $backupfile</font>");
      #  If the file being pushed is the host file, we adjust the entry for ourself so that the
      #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
      #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a
- Line 655  sub PushFile {
+ Line 668  sub PushFile {
      #  Install the new file:
+     &logthis("Installing new $tablefile contents:\n$contents");
      if(!InstallFile($tablefile, $contents)) {
  	&logthis('<font color="red"> Pushfile: unable to install '
  	 .$tablefile." $! </font>");
- Line 835  sub AdjustOurHost {
+ Line 849  sub AdjustOurHost {
      #   Use the config line to get my hostname.
      #   Use gethostbyname to translate that into an IP address.
      #
-     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
+     my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
-     my $BinaryIp = gethostbyname($name);
-     my $ip       = inet_ntoa($ip);
      #
      #  Reassemble the config line from the elements in the list.
      #  Note that if the loncnew items were not present before, they will
      #  be now even if they would be empty
      #
      my $newConfigLine = $id;
-     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
+     foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) {
  	$newConfigLine .= ":".$item;
      }
      #  Replace the line:
- Line 890  sub EditFile {
+ Line 902  sub EditFile {
      #  Split the command into it's pieces:  edit:filetype:script
-     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
+     my ($cmd, $filetype, $script) = split(/:/, $request,3);	# : in script
      #  Check the pre-coditions for success:
-     if($request != "edit") {	# Something is amiss afoot alack.
+     if($cmd != "edit") {	# Something is amiss afoot alack.
  	return "error:edit request detected, but request != 'edit'\n";
      }
      if( ($filetype ne "hosts")  &&
- Line 1008  sub ping_handler {
+ Line 1020  sub ping_handler {
      my ($cmd, $tail, $client) = @_;
      Debug("$cmd $tail $client .. $currenthostid:");
-     Reply( $client,"$currenthostid\n","$cmd:$tail");
+     Reply( $client,\$currenthostid,"$cmd:$tail");
      return 1;
  }
- Line 1034  sub ping_handler {
+ Line 1046  sub ping_handler {
  sub pong_handler {
      my ($cmd, $tail, $replyfd) = @_;
-     my $reply=&reply("ping",$clientname);
+     my $reply=&Apache::lonnet::reply("ping",$clientname);
      &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
      return 1;
  }
- Line 1078  sub establish_key_handler {
+ Line 1090  sub establish_key_handler {
      $key=substr($key,0,32);
      my $cipherkey=pack("H32",$key);
      $cipher=new IDEA $cipherkey;
-     &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
+     &Reply($replyfd, \$buildkey, "$cmd:$tail");
      return 1;
- Line 1115  sub load_handler {
+ Line 1127  sub load_handler {
      my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
-     &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
+     &Reply( $replyfd, \$loadpercent, "$cmd:$tail");
      return 1;
  }
- Line 1144  sub load_handler {
+ Line 1156  sub load_handler {
  sub user_load_handler {
      my ($cmd, $tail, $replyfd) = @_;
-     my $userloadpercent=&userload();
+     my $userloadpercent=&Apache::lonnet::userload();
-     &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
+     &Reply($replyfd, \$userloadpercent, "$cmd:$tail");
      return 1;
  }
- Line 1188  sub user_authorization_type {
+ Line 1200  sub user_authorization_type {
  	} else {
              $type .= ':';
          }
- 	&Reply( $replyfd, "$type\n", $userinput);
+ 	&Reply( $replyfd, \$type, $userinput);
      }
      return 1;
- Line 1210  sub user_authorization_type {
+ Line 1222  sub user_authorization_type {
  #    a reply is written to the client.
  sub push_file_handler {
      my ($cmd, $tail, $client) = @_;
+     &Debug("In push file handler");
      my $userinput = "$cmd:$tail";
      # At this time we only know that the IP of our partner is a valid manager
- Line 1218  sub push_file_handler {
+ Line 1230  sub push_file_handler {
      # spoofing).
      my $cert = &GetCertificate($userinput);
      if(&ValidManager($cert)) {
+ 	&Debug("Valid manager: $client");
  	# Now presumably we have the bona fides of both the peer host and the
  	# process making the request.
  	my $reply = &PushFile($userinput);
- 	&Reply($client, "$reply\n", $userinput);
+ 	&Reply($client, \$reply, $userinput);
      } else {
+ 	&logthis("push_file_handler $client is not valid");
  	&Failure( $client, "refused\n", $userinput);
      }
      return 1;
  }
  &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
+ # The du_handler routine should be considered obsolete and is retained
+ # for communication with legacy servers.  Please see the du2_handler.
  #
- #   du  - list the disk usuage of a directory recursively.
+ #   du  - list the disk usage of a directory recursively.
  #
  #   note: stolen code from the ls file handler
  #   under construction by Rick Banghart
- Line 1252  sub push_file_handler {
+ Line 1268  sub push_file_handler {
  #
  sub du_handler {
      my ($cmd, $ududir, $client) = @_;
-     my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
+     ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
      my $userinput = "$cmd:$ududir";
      if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
- Line 1270  sub du_handler {
+ Line 1286  sub du_handler {
  	my $code=sub {
  	    if ($_=~/\.\d+\./) { return;}
  	    if ($_=~/\.meta$/) { return;}
+ 	    if (-d $_)         { return;}
  	    $total_size+=(stat($_))[7];
  	};
  	chdir($ududir);
  	find($code,$ududir);
  	$total_size=int($total_size/1024);
- 	&Reply($client,"$total_size\n","$cmd:$ududir");
+ 	&Reply($client,\$total_size,"$cmd:$ududir");
      } else {
  	&Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
      }
- Line 1283  sub du_handler {
+ Line 1300  sub du_handler {
  }
  &register_handler("du", \&du_handler, 0, 1, 0);
+ # Please also see the du_handler, which is obsoleted by du2.
+ # du2_handler differs from du_handler in that required path to directory
+ # provided by &propath() is prepended in the handler instead of on the
+ # client side.
+ #
+ #   du2  - list the disk usage of a directory recursively.
  #
- # The ls_handler routine should be considered obosolete and is retained
+ # Parameters:
- # for communication with legacy servers.  Please see the ls2_handler.
+ #    $cmd        - The command that dispatched us (du).
+ #    $tail       - The tail of the request that invoked us.
+ #                  $tail is a : separated list of the following:
+ #                   - $ududir - directory path to list (before prepending)
+ #                   - $getpropath = 1 if &propath() should prepend
+ #                   - $uname - username to use for &propath or user dir
+ #                   - $udom - domain to use for &propath or user dir
+ #                   All are escaped.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to $client.
+ #
+ sub du2_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($ududir,$getpropath,$uname,$udom) = map { &unescape($_) } (split(/:/, $tail));
+     my $userinput = "$cmd:$tail";
+     if (($ududir=~/\.\./) || (($ududir!~m|^/home/httpd/|) && (!$getpropath))) {
+         &Failure($client,"refused\n","$cmd:$tail");
+         return 1;
+     }
+     if ($getpropath) {
+         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
+             $ududir = &propath($udom,$uname).'/'.$ududir;
+         } else {
+             &Failure($client,"refused\n","$cmd:$tail");
+             return 1;
+         }
+     }
+     #  Since $ududir could have some nasties in it,
+     #  we will require that ududir is a valid
+     #  directory.  Just in case someone tries to
+     #  slip us a  line like .;(cd /home/httpd rm -rf*)
+     #  etc.
+     #
+     if (-d $ududir) {
+         my $total_size=0;
+         my $code=sub {
+             if ($_=~/\.\d+\./) { return;}
+             if ($_=~/\.meta$/) { return;}
+             if (-d $_)         { return;}
+             $total_size+=(stat($_))[7];
+         };
+         chdir($ududir);
+         find($code,$ududir);
+         $total_size=int($total_size/1024);
+         &Reply($client,\$total_size,"$cmd:$ududir");
+     } else {
+         &Failure($client, "bad_directory:$ududir\n","$cmd:$tail");
+     }
+     return 1;
+ }
+ &register_handler("du2", \&du2_handler, 0, 1, 0);
+ #
+ # The ls_handler routine should be considered obsolete and is retained
+ # for communication with legacy servers.  Please see the ls3_handler.
  #
  #   ls  - list the contents of a directory.  For each file in the
  #    selected directory the filename followed by the full output of
- Line 1344  sub ls_handler {
+ Line 1425  sub ls_handler {
  	$ulsout='no_such_dir';
      }
      if ($ulsout eq '') { $ulsout='empty'; }
-     &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
+     &Reply($client, \$ulsout, $userinput); # This supports debug logging.
      return 1;
  }
  &register_handler("ls", \&ls_handler, 0, 1, 0);
- #
+ # The ls2_handler routine should be considered obsolete and is retained
- # Please also see the ls_handler, which this routine obosolets.
+ # for communication with legacy servers.  Please see the ls3_handler.
+ # Please also see the ls_handler, which was itself obsoleted by ls2.
  # ls2_handler differs from ls_handler in that it escapes its return
  # values before concatenating them together with ':'s.
  #
- Line 1413  sub ls2_handler {
+ Line 1495  sub ls2_handler {
          $ulsout='no_such_dir';
     }
     if ($ulsout eq '') { $ulsout='empty'; }
-    &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
+    &Reply($client, \$ulsout, $userinput); # This supports debug logging.
     return 1;
  }
  &register_handler("ls2", \&ls2_handler, 0, 1, 0);
+ #
+ #   ls3  - list the contents of a directory.  For each file in the
+ #    selected directory the filename followed by the full output of
+ #    the stat function is returned.  The returned info for each
+ #    file are separated by ':'.  The stat fields are separated by &'s.
+ # Parameters:
+ #    $cmd        - The command that dispatched us (ls).
+ #    $tail       - The tail of the request that invoked us.
+ #                  $tail is a : separated list of the following:
+ #                   - $ulsdir - directory path to list (before prepending)
+ #                   - $getpropath = 1 if &propath() should prepend
+ #                   - $getuserdir = 1 if path to user dir in lonUsers should
+ #                                     prepend
+ #                   - $alternate_root - path to prepend
+ #                   - $uname - username to use for &propath or user dir
+ #                   - $udom - domain to use for &propath or user dir
+ #            All of these except $getpropath and &getuserdir are escaped.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to $client.
+ #
+ sub ls3_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($ulsdir,$getpropath,$getuserdir,$alternate_root,$uname,$udom) =
+         split(/:/,$tail);
+     if (defined($ulsdir)) {
+         $ulsdir = &unescape($ulsdir);
+     }
+     if (defined($alternate_root)) {
+         $alternate_root = &unescape($alternate_root);
+     }
+     if (defined($uname)) {
+         $uname = &unescape($uname);
+     }
+     if (defined($udom)) {
+         $udom = &unescape($udom);
+     }
+     my $dir_root = $perlvar{'lonDocRoot'};
+     if ($getpropath) {
+         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
+             $dir_root = &propath($udom,$uname);
+             $dir_root =~ s/\/$//;
+         } else {
+             &Failure($client,"refused\n","$cmd:$tail");
+             return 1;
+         }
+     } elsif ($getuserdir) {
+         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
+             my $subdir=$uname.'__';
+             $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
+             $dir_root = $Apache::lonnet::perlvar{'lonUsersDir'}
+                        ."/$udom/$subdir/$uname";
+         } else {
+             &Failure($client,"refused\n","$cmd:$tail");
+             return 1;
+         }
+     } elsif ($alternate_root ne '') {
+         $dir_root = $alternate_root;
+     }
+     if (($dir_root ne '') && ($dir_root ne '/')) {
+         if ($ulsdir =~ /^\//) {
+             $ulsdir = $dir_root.$ulsdir;
+         } else {
+             $ulsdir = $dir_root.'/'.$ulsdir;
+         }
+     }
+     my $obs;
+     my $rights;
+     my $ulsout='';
+     my $ulsfn;
+     if (-e $ulsdir) {
+         if(-d $ulsdir) {
+             if (opendir(LSDIR,$ulsdir)) {
+                 while ($ulsfn=readdir(LSDIR)) {
+                     undef($obs);
+                     undef($rights);
+                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+                     #We do some obsolete checking here
+                     if(-e $ulsdir.'/'.$ulsfn.".meta") {
+                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+                         my @obsolete=<FILE>;
+                         foreach my $obsolete (@obsolete) {
+                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
+                             if($obsolete =~ m|(<copyright>)(default)|) {
+                                 $rights = 1;
+                             }
+                         }
+                     }
+                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
+                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     $ulsout.= &escape($tmp).':';
+                 }
+                 closedir(LSDIR);
+             }
+         } else {
+             my @ulsstats=stat($ulsdir);
+             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+         }
+     } else {
+         $ulsout='no_such_dir';
+     }
+     if ($ulsout eq '') { $ulsout='empty'; }
+     &Reply($client, \$ulsout, $userinput); # This supports debug logging.
+     return 1;
+ }
+ &register_handler("ls3", \&ls3_handler, 0, 1, 0);
+ sub server_timezone_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $timezone;
+     my $clockfile = '/etc/sysconfig/clock'; # Fedora/CentOS/SuSE
+     my $tzfile = '/etc/timezone'; # Debian/Ubuntu
+     if (-e $clockfile) {
+         if (open(my $fh,"<$clockfile")) {
+             while (<$fh>) {
+                 next if (/^[\#\s]/);
+                 if (/^(?:TIME)?ZONE\s*=\s*['"]?\s*([\w\/]+)/) {
+                     $timezone = $1;
+                     last;
+                 }
+             }
+             close($fh);
+         }
+     } elsif (-e $tzfile) {
+         if (open(my $fh,"<$tzfile")) {
+             $timezone = <$fh>;
+             close($fh);
+             chomp($timezone);
+             if ($timezone =~ m{^Etc/(\w+)$}) {
+                 $timezone = $1;
+             }
+         }
+     }
+     &Reply($client,\$timezone,$userinput); # This supports debug logging.
+     return 1;
+ }
+ &register_handler("servertimezone", \&server_timezone_handler, 0, 1, 0);
  #   Process a reinit request.  Reinit requests that either
  #   lonc or lond be reinitialized so that an updated
- Line 1441  sub reinit_process_handler {
+ Line 1668  sub reinit_process_handler {
      if(&ValidManager($cert)) {
  	chomp($userinput);
  	my $reply = &ReinitProcess($userinput);
- 	&Reply( $client,  "$reply\n", $userinput);
+ 	&Reply( $client,  \$reply, $userinput);
      } else {
  	&Failure( $client, "refused\n", $userinput);
      }
- Line 1525  sub authenticate_handler {
+ Line 1752  sub authenticate_handler {
      #  udom    - User's domain.
      #  uname   - Username.
      #  upass   - User's password.
+     #  checkdefauth - Pass to validate_user() to try authentication
+     #                 with default auth type(s) if no user account.
-     my ($udom,$uname,$upass)=split(/:/,$tail);
+     my ($udom, $uname, $upass, $checkdefauth)=split(/:/,$tail);
-     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
+     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass,  checkdefauth = $checkdefauth");
      chomp($upass);
      $upass=&unescape($upass);
-     my $pwdcorrect = &validate_user($udom, $uname, $upass);
+     my $pwdcorrect = &validate_user($udom,$uname,$upass,$checkdefauth);
      if($pwdcorrect) {
  	&Reply( $client, "authorized\n", $userinput);
  	#
- Line 1576  sub change_password_handler {
+ Line 1805  sub change_password_handler {
      #  uname - Username.
      #  upass - Current password.
      #  npass - New password.
+     #  context - Context in which this was called
+     #            (preferences or reset_by_email).
-     my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
+     my ($udom,$uname,$upass,$npass,$context)=split(/:/,$tail);
      $upass=&unescape($upass);
      $npass=&unescape($npass);
      &Debug("Trying to change password for $uname");
      # First require that the user can be authenticated with their
-     # old password:
+     # old password unless context was 'reset_by_email':
-     my $validated = &validate_user($udom, $uname, $upass);
+     my $validated;
+     if ($context eq 'reset_by_email') {
+         $validated = 1;
+     } else {
+         $validated = &validate_user($udom, $uname, $upass);
+     }
      if($validated) {
  	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
- Line 1605  sub change_password_handler {
+ Line 1841  sub change_password_handler {
  			 ."to change password");
  		&Failure( $client, "non_authorized\n",$userinput);
  	    }
- 	} elsif ($howpwd eq 'unix') {
+ 	} elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
  	    my $result = &change_unix_password($uname, $npass);
  	    &logthis("Result of password change for $uname: ".
  		     $result);
- 	    &Reply($client, "$result\n", $userinput);
+ 	    &Reply($client, \$result, $userinput);
  	} else {
  	    # this just means that the current password mode is not
  	    # one we know how to change (e.g the kerberos auth modes or
- Line 1670  sub add_user_handler {
+ Line 1906  sub add_user_handler {
  	    }
  	    unless ($fperror) {
  		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
- 		&Reply($client, $result, $userinput);     #BUGBUG - could be fail
+ 		&Reply($client,\$result, $userinput);     #BUGBUG - could be fail
  	    } else {
- 		&Failure($client, "$fperror\n", $userinput);
+ 		&Failure($client, \$fperror, $userinput);
  	    }
  	}
  	umask($oldumask);
- Line 1739  sub change_authentication_handler {
+ Line 1975  sub change_authentication_handler {
  		my $result = &change_unix_password($uname, $npass);
  		&logthis("Result of password change for $uname: ".$result);
  		if ($result eq "ok") {
- 		    &Reply($client, "$result\n")
+ 		    &Reply($client, \$result);
  		} else {
- 		    &Failure($client, "$result\n");
+ 		    &Failure($client, \$result);
  		}
  	    } else {
  		my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
- Line 1760  sub change_authentication_handler {
+ Line 1996  sub change_authentication_handler {
  			&manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
  		    }
  		}
- 		&Reply($client, $result, $userinput);
+ 		&Reply($client, \$result, $userinput);
  	    }
- Line 1844  sub update_resource_handler {
+ Line 2080  sub update_resource_handler {
  	    my $now=time;
  	    my $since=$now-$atime;
  	    if ($since>$perlvar{'lonExpire'}) {
- 		my $reply=&reply("unsub:$fname","$clientname");
+ 		my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
  		&devalidate_meta_cache($fname);
  		unlink("$fname");
  		unlink("$fname.meta");
  	    } else {
  		my $transname="$fname.in.transfer";
- 		my $remoteurl=&reply("sub:$fname","$clientname");
+ 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
  		my $response;
  		alarm(120);
  		{
- Line 1895  sub devalidate_meta_cache {
+ Line 2131  sub devalidate_meta_cache {
      my ($url) = @_;
      use Cache::Memcached;
      my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
-     $url = &declutter($url);
+     $url = &Apache::lonnet::declutter($url);
      $url =~ s-\.meta$--;
      my $id = &escape('meta:'.$url);
      $memcache->delete($id);
  }
- sub declutter {
-     my $thisfn=shift;
-     $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
-     $thisfn=~s/^\///;
-     $thisfn=~s|^adm/wrapper/||;
-     $thisfn=~s|^adm/coursedocs/showdoc/||;
-     $thisfn=~s/^res\///;
-     $thisfn=~s/\?.+$//;
-     return $thisfn;
- }
  #
  #   Fetch a user file from a remote server to the user's home directory
  #   userfiles subdir.
- Line 2109  sub rename_user_file_handler {
+ Line 2335  sub rename_user_file_handler {
  &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
  #
+ #  Checks if the specified user has an active session on the server
+ #  return ok if so, not_found if not
+ #
+ # Parameters:
+ #   cmd      - The request keyword that dispatched to tus.
+ #   tail     - The tail of the request (colon separated parameters).
+ #   client   - Filehandle open on the client.
+ # Return:
+ #    1.
+ sub user_has_session_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($udom, $uname) = map { &unescape($_) } (split(/:/, $tail));
+     &logthis("Looking for $udom $uname");
+     opendir(DIR,$perlvar{'lonIDsDir'});
+     my $filename;
+     while ($filename=readdir(DIR)) {
+ 	last if ($filename=~/^\Q$uname\E_\d+_\Q$udom\E_/);
+     }
+     if ($filename) {
+ 	&Reply($client, "ok\n", "$cmd:$tail");
+     } else {
+ 	&Failure($client, "not_found\n", "$cmd:$tail");
+     }
+     return 1;
+ }
+ &register_handler("userhassession", \&user_has_session_handler, 0,1,0);
+ #
  #  Authenticate access to a user file by checking that the token the user's
  #  passed also exists in their session file
  #
- Line 2124  sub token_auth_user_file_handler {
+ Line 2381  sub token_auth_user_file_handler {
      my ($fname, $session) = split(/:/, $tail);
      chomp($session);
-     my $reply="non_auth\n";
+     my $reply="non_auth";
-     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
+     my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
- 	     $session.'.id')) {
+     if (open(ENVIN,"$file")) {
  	flock(ENVIN,LOCK_SH);
- 	while (my $line=<ENVIN>) {
+ 	tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640);
- 	    my ($envname)=split(/=/,$line,2);
+ 	if (exists($disk_env{"userfile.$fname"})) {
- 	    $envname=&unescape($envname);
+ 	    $reply="ok";
- 	    if ($envname=~ m|^userfile\.\Q$fname\E|) { $reply="ok\n"; }
+ 	} else {
+ 	    foreach my $envname (keys(%disk_env)) {
+ 		if ($envname=~ m|^userfile\.\Q$fname\E|) {
+ 		    $reply="ok";
+ 		    last;
+ 		}
+ 	    }
  	}
+ 	untie(%disk_env);
  	close(ENVIN);
- 	&Reply($client, $reply, "$cmd:$tail");
+ 	&Reply($client, \$reply, "$cmd:$tail");
      } else {
  	&Failure($client, "invalid_token\n", "$cmd:$tail");
      }
- Line 2194  sub subscribe_handler {
+ Line 2458  sub subscribe_handler {
  &register_handler("sub", \&subscribe_handler, 0, 1, 0);
  #
- #   Determine the version of a resource (?) Or is it return
+ #   Determine the latest version of a resource (it looks for the highest
- #   the top version of the resource?  Not yet clear from the
+ #   past version and then returns that +1)
- #   code in currentversion.
  #
  # Parameters:
  #    $cmd      - The command that got us here.
  #    $tail     - Tail of the command (remaining parameters).
+ #                 (Should consist of an absolute path to a file)
  #    $client   - File descriptor connected to client.
  # Returns
  #     0        - Requested to exit, caller should shut down.
- Line 2558  sub get_profile_entry {
+ Line 2822  sub get_profile_entry {
      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
      chomp($what);
      my $replystring = read_profile($udom, $uname, $namespace, $what);
      my ($first) = split(/:/,$replystring);
      if($first ne "error") {
- 	&Reply($client, "$replystring\n", $userinput);
+ 	&Reply($client, \$replystring, $userinput);
      } else {
  	&Failure($client, $replystring." while attempting get\n", $userinput);
      }
- Line 2595  sub get_profile_entry_encrypted {
+ Line 2860  sub get_profile_entry_encrypted {
      my $userinput = "$cmd:$tail";
-     my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
      chomp($what);
      my $qresult = read_profile($udom, $uname, $namespace, $what);
      my ($first) = split(/:/, $qresult);
- Line 2701  sub get_profile_keys {
+ Line 2966  sub get_profile_keys {
  	}
  	if (&untie_user_hash($hashref)) {
  	    $qresult=~s/\&$//;
- 	    &Reply($client, "$qresult\n", $userinput);
+ 	    &Reply($client, \$qresult, $userinput);
  	} else {
  	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
  		    "while attempting keys\n", $userinput);
- Line 2771  sub dump_profile_database {
+ Line 3036  sub dump_profile_database {
  		}
  	    }
  	    chop($qresult);
- 	    &Reply($client , "$qresult\n", $userinput);
+ 	    &Reply($client , \$qresult, $userinput);
  	} else {
  	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
  		     "while attempting currentdump\n", $userinput);
- Line 2854  sub dump_with_regexp {
+ Line 3119  sub dump_with_regexp {
  	}
  	if (&untie_user_hash($hashref)) {
  	    chop($qresult);
- 	    &Reply($client, "$qresult\n", $userinput);
+ 	    &Reply($client, \$qresult, $userinput);
  	} else {
  	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
  		     "while attempting dump\n", $userinput);
- Line 3040  sub restore_handler {
+ Line 3305  sub restore_handler {
      my ($cmd, $tail, $client) = @_;
      my $userinput = "$cmd:$tail";	# Only used for logging purposes.
+     my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
-     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
      $namespace=~s/\//\_/g;
-     $namespace=~s/\W//g;
+     $namespace = &LONCAPA::clean_username($namespace);
      chomp($rid);
      my $qresult='';
      my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
- Line 3062  sub restore_handler {
+ Line 3327  sub restore_handler {
  	}
  	if (&untie_user_hash($hashref)) {
  	    $qresult=~s/\&$//;
- 	    &Reply( $client, "$qresult\n", $userinput);
+ 	    &Reply( $client, \$qresult, $userinput);
  	} else {
  	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
  		    "while attempting restore\n", $userinput);
- Line 3143  sub retrieve_chat_handler {
+ Line 3408  sub retrieve_chat_handler {
  	$reply.=&escape($_).':';
      }
      $reply=~s/\:$//;
-     &Reply($client, $reply."\n", $userinput);
+     &Reply($client, \$reply, $userinput);
      return 1;
- Line 3216  sub reply_query_handler {
+ Line 3481  sub reply_query_handler {
      my $userinput = "$cmd:$tail";
-     my ($cmd,$id,$reply)=split(/:/,$userinput);
+     my ($id,$reply)=split(/:/,$tail);
      my $store;
      my $execdir=$perlvar{'lonDaemons'};
      if ($store=IO::File->new(">$execdir/tmp/$id")) {
- Line 3280  sub put_course_id_handler {
+ Line 3545  sub put_course_id_handler {
  	foreach my $pair (@pairs) {
              my ($key,$courseinfo) = split(/=/,$pair,2);
              $courseinfo =~ s/=/:/g;
+             if (defined($hashref->{$key})) {
-             my @current_items = split(/:/,$hashref->{$key});
+                 my $value = &Apache::lonnet::thaw_unescape($hashref->{$key});
+                 if (ref($value) eq 'HASH') {
+                     my @items = ('description','inst_code','owner','type');
+                     my @new_items = split(/:/,$courseinfo,-1);
+                     my %storehash;
+                     for (my $i=0; $i<@new_items; $i++) {
+                         $storehash{$items[$i]} = &unescape($new_items[$i]);
+                     }
+                     $hashref->{$key} =
+                         &Apache::lonnet::freeze_escape(\%storehash);
+                     my $unesc_key = &unescape($key);
+                     $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
+                     next;
+                 }
+             }
+             my @current_items = split(/:/,$hashref->{$key},-1);
              shift(@current_items); # remove description
              pop(@current_items);   # remove last access
              my $numcurrent = scalar(@current_items);
+             if ($numcurrent > 3) {
-             my @new_items = split(/:/,$courseinfo);
+                 $numcurrent = 3;
+             }
+             my @new_items = split(/:/,$courseinfo,-1);
              my $numnew = scalar(@new_items);
              if ($numcurrent > 0) {
                  if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2
- Line 3295  sub put_course_id_handler {
+ Line 3577  sub put_course_id_handler {
                      }
                  }
              }
- 	    $hashref->{$key}=$courseinfo.':'.$now;
+             $hashref->{$key}=$courseinfo.':'.$now;
  	}
  	if (&untie_domain_hash($hashref)) {
  	    &Reply( $client, "ok\n", $userinput);
- Line 3309  sub put_course_id_handler {
+ Line 3591  sub put_course_id_handler {
  		 ." tie(GDBM) Failed ".
  		 "while attempting courseidput\n", $userinput);
      }
      return 1;
  }
  &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
+ sub put_course_id_hash_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$mode,$what) = split(/:/, $tail,3);
+     chomp($what);
+     my $now=time;
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+         foreach my $pair (@pairs) {
+             my ($key,$value)=split(/=/,$pair);
+             my $unesc_key = &unescape($key);
+             if ($mode ne 'timeonly') {
+                 if (!defined($hashref->{&escape('lasttime:'.$unesc_key)})) {
+                     my $curritems = &Apache::lonnet::thaw_unescape($key);
+                     if (ref($curritems) ne 'HASH') {
+                         my @current_items = split(/:/,$hashref->{$key},-1);
+                         my $lasttime = pop(@current_items);
+                         $hashref->{&escape('lasttime:'.$unesc_key)} = $lasttime;
+                     } else {
+                         $hashref->{&escape('lasttime:'.$unesc_key)} = '';
+                     }
+                 }
+                 $hashref->{$key} = $value;
+             }
+             if ($mode ne 'notime') {
+                 $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
+             }
+         }
+         if (&untie_domain_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                      "while attempting courseidputhash\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting courseidputhash\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseidputhash", \&put_course_id_hash_handler, 0, 1, 0);
  #  Retrieves the value of a course id resource keyword pattern
  #  defined since a starting date.  Both the starting date and the
  #  keyword pattern are optional.  If the starting date is not supplied it
- Line 3336  sub put_course_id_handler {
+ Line 3660  sub put_course_id_handler {
  #                 institutional code - optional supplied code to filter
  #                            the dump. Only courses with an institutional code
  #                            that match the supplied code will be returned.
- #                 owner    - optional supplied username of owner to filter
+ #                 owner    - optional supplied username and domain of owner to
- #                            the dump.  Only courses for which the course
+ #                            filter the dump.  Only courses for which the course
- #                            owner matches the supplied username will be
+ #                            owner matches the supplied username and/or domain
- #                            returned. Implicit assumption that owner
+ #                            will be returned. Pre-2.2.0 legacy entries from
- #                            is a user in the domain in which the
+ #                            nohist_courseiddump will only contain usernames.
- #                            course database is defined.
+ #                 type     - optional parameter for selection
+ #                 regexp_ok - if true, allow the supplied institutional code
+ #                            filter to behave as a regular expression.
+ #                 rtn_as_hash - whether to return the information available for
+ #                            each matched item as a frozen hash of all
+ #                            key, value pairs in the item's hash, or as a
+ #                            colon-separated list of (in order) description,
+ #                            institutional code, and course owner.
+ #                 selfenrollonly - filter by courses allowing self-enrollment
+ #                                  now or in the future (selfenrollonly = 1).
+ #                 catfilter - filter by course category, assigned to a course
+ #                             using manually defined categories (i.e., not
+ #                             self-cataloging based on on institutional code).
+ #                 showhidden - include course in results even if course
+ #                              was set to be excluded from course catalog (DC only).
+ #                 caller -  if set to 'coursecatalog', courses set to be hidden
+ #                           from course catalog will be excluded from results (unless
+ #                           overridden by "showhidden".
+ #
  #     $client  - The socket open on the client.
  # Returns:
  #    1     - Continue processing.
- Line 3349  sub put_course_id_handler {
+ Line 3691  sub put_course_id_handler {
  #   a reply is written to $client.
  sub dump_course_id_handler {
      my ($cmd, $tail, $client) = @_;
      my $userinput = "$cmd:$tail";
      my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
-         $typefilter) =split(/:/,$tail);
+         $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
+         $caller) =split(/:/,$tail);
+     my $now = time;
      if (defined($description)) {
  	$description=&unescape($description);
      } else {
- Line 3364  sub dump_course_id_handler {
+ Line 3707  sub dump_course_id_handler {
      } else {
          $instcodefilter='.';
      }
+     my ($ownerunamefilter,$ownerdomfilter);
      if (defined($ownerfilter)) {
          $ownerfilter=&unescape($ownerfilter);
+         if ($ownerfilter ne '.' && defined($ownerfilter)) {
+             if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
+                  $ownerunamefilter = $1;
+                  $ownerdomfilter = $2;
+             } else {
+                 $ownerunamefilter = $ownerfilter;
+                 $ownerdomfilter = '';
+             }
+         }
      } else {
          $ownerfilter='.';
      }
      if (defined($coursefilter)) {
          $coursefilter=&unescape($coursefilter);
      } else {
- Line 3379  sub dump_course_id_handler {
+ Line 3733  sub dump_course_id_handler {
      } else {
          $typefilter='.';
      }
+     if (defined($regexp_ok)) {
-     unless (defined($since)) { $since=0; }
+         $regexp_ok=&unescape($regexp_ok);
+     }
+     if (defined($catfilter)) {
+         $catfilter=&unescape($catfilter);
+     }
+     my $unpack = 1;
+     if ($description eq '.' && $instcodefilter eq '.' && $coursefilter eq '.' &&
+         $typefilter eq '.') {
+         $unpack = 0;
+     }
+     if (!defined($since)) { $since=0; }
      my $qresult='';
      my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
      if ($hashref) {
  	while (my ($key,$value) = each(%$hashref)) {
- 	    my ($descr,$lasttime,$inst_code,$owner,$type);
+             my ($unesc_key,$lasttime_key,$lasttime,$is_hash,%val,
-             my @courseitems = split(/:/,$value);
+                 %unesc_val,$selfenroll_end,$selfenroll_types);
-             $lasttime = pop(@courseitems);
+             $unesc_key = &unescape($key);
- 	    ($descr,$inst_code,$owner,$type)=@courseitems;
+             if ($unesc_key =~ /^lasttime:/) {
- 	    if ($lasttime<$since) { next; }
+                 next;
+             } else {
+                 $lasttime_key = &escape('lasttime:'.$unesc_key);
+             }
+             if ($hashref->{$lasttime_key} ne '') {
+                 $lasttime = $hashref->{$lasttime_key};
+                 next if ($lasttime<$since);
+             }
+             my $items = &Apache::lonnet::thaw_unescape($value);
+             if (ref($items) eq 'HASH') {
+                 $is_hash =  1;
+                 if ($unpack || !$rtn_as_hash) {
+                     $unesc_val{'descr'} = $items->{'description'};
+                     $unesc_val{'inst_code'} = $items->{'inst_code'};
+                     $unesc_val{'owner'} = $items->{'owner'};
+                     $unesc_val{'type'} = $items->{'type'};
+                 }
+                 $selfenroll_types = $items->{'selfenroll_types'};
+                 $selfenroll_end = $items->{'selfenroll_end_date'};
+                 if ($selfenrollonly) {
+                     next if (!$selfenroll_types);
+                     if (($selfenroll_end > 0) && ($selfenroll_end <= $now)) {
+                         next;
+                     }
+                 }
+                 if ($catfilter ne '') {
+                     next if ($items->{'categories'} eq '');
+                     my @categories = split('&',$items->{'categories'});
+                     next if (@categories == 0);
+                     my @subcats = split('&',$catfilter);
+                     my $matchcat = 0;
+                     foreach my $cat (@categories) {
+                         if (grep(/^\Q$cat\E$/,@subcats)) {
+                             $matchcat = 1;
+                             last;
+                         }
+                     }
+                     next if (!$matchcat);
+                 }
+                 if ($caller eq 'coursecatalog') {
+                     if ($items->{'hidefromcat'} eq 'yes') {
+                         next if !$showhidden;
+                     }
+                 }
+             } else {
+                 next if ($catfilter ne '');
+                 next if ($selfenrollonly);
+                 $is_hash =  0;
+                 my @courseitems = split(/:/,$value);
+                 $lasttime = pop(@courseitems);
+                 if ($hashref->{$lasttime_key} eq '') {
+                     next if ($lasttime<$since);
+                 }
+ 	        ($val{'descr'},$val{'inst_code'},$val{'owner'},$val{'type'}) = @courseitems;
+             }
              my $match = 1;
- 	    unless ($description eq '.') {
+ 	    if ($description ne '.') {
- 		my $unescapeDescr = &unescape($descr);
+                 if (!$is_hash) {
- 		unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
+                     $unesc_val{'descr'} = &unescape($val{'descr'});
+                 }
+                 if (eval{$unesc_val{'descr'} !~ /\Q$description\E/i}) {
                      $match = 0;
- 		}
+                 }
              }
-             unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
+             if ($instcodefilter ne '.') {
-                 my $unescapeInstcode = &unescape($inst_code);
+                 if (!$is_hash) {
-                 unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
+                     $unesc_val{'inst_code'} = &unescape($val{'inst_code'});
-                     $match = 0;
+                 }
+                 if ($regexp_ok) {
+                     if (eval{$unesc_val{'inst_code'} !~ /$instcodefilter/}) {
+                         $match = 0;
+                     }
+                 } else {
+                     if (eval{$unesc_val{'inst_code'} !~ /\Q$instcodefilter\E/i}) {
+                         $match = 0;
+                     }
                  }
  	    }
-             unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
+             if ($ownerfilter ne '.') {
-                 my $unescapeOwner = &unescape($owner);
+                 if (!$is_hash) {
-                 unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
+                     $unesc_val{'owner'} = &unescape($val{'owner'});
-                     $match = 0;
+                 }
+                 if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
+                     if ($unesc_val{'owner'} =~ /:/) {
+                         if (eval{$unesc_val{'owner'} !~
+                              /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i}) {
+                             $match = 0;
+                         }
+                     } else {
+                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
+                             $match = 0;
+                         }
+                     }
+                 } elsif ($ownerunamefilter ne '') {
+                     if ($unesc_val{'owner'} =~ /:/) {
+                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E:[^:]+$/i}) {
+                              $match = 0;
+                         }
+                     } else {
+                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
+                             $match = 0;
+                         }
+                     }
+                 } elsif ($ownerdomfilter ne '') {
+                     if ($unesc_val{'owner'} =~ /:/) {
+                         if (eval{$unesc_val{'owner'} !~ /^[^:]+:\Q$ownerdomfilter\E/}) {
+                              $match = 0;
+                         }
+                     } else {
+                         if ($ownerdomfilter ne $udom) {
+                             $match = 0;
+                         }
+                     }
                  }
              }
-             unless ($coursefilter eq '.' || !defined($coursefilter)) {
+             if ($coursefilter ne '.') {
-                 my $unescapeCourse = &unescape($key);
+                 if (eval{$unesc_key !~ /^$udom(_)\Q$coursefilter\E$/}) {
-                 unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
                      $match = 0;
                  }
              }
-             unless ($typefilter eq '.' || !defined($typefilter)) {
+             if ($typefilter ne '.') {
-                 my $unescapeType = &unescape($type);
+                 if (!$is_hash) {
-                 if (!defined($type)) {
+                     $unesc_val{'type'} = &unescape($val{'type'});
+                 }
+                 if ($unesc_val{'type'} eq '') {
                      if ($typefilter ne 'Course') {
                          $match = 0;
                      }
                  } else {
-                     unless (eval('$unescapeType=~/^\Q$typefilter\E$/')) {
+                     if (eval{$unesc_val{'type'} !~ /^\Q$typefilter\E$/}) {
                          $match = 0;
                      }
                  }
              }
              if ($match == 1) {
-                 $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
+                 if ($rtn_as_hash) {
+                     if ($is_hash) {
+                         $qresult.=$key.'='.$value.'&';
+                     } else {
+                         my %rtnhash = ( 'description' => &unescape($val{'descr'}),
+                                         'inst_code' => &unescape($val{'inst_code'}),
+                                         'owner'     => &unescape($val{'owner'}),
+                                         'type'      => &unescape($val{'type'}),
+                                       );
+                         my $items = &Apache::lonnet::freeze_escape(\%rtnhash);
+                         $qresult.=$key.'='.$items.'&';
+                     }
+                 } else {
+                     if ($is_hash) {
+                         $qresult .= $key.'='.&escape($unesc_val{'descr'}).':'.
+                                     &escape($unesc_val{'inst_code'}).':'.
+                                     &escape($unesc_val{'owner'}).'&';
+                     } else {
+                         $qresult .= $key.'='.$val{'descr'}.':'.$val{'inst_code'}.
+                                     ':'.$val{'owner'}.'&';
+                     }
+                 }
              }
  	}
  	if (&untie_domain_hash($hashref)) {
  	    chop($qresult);
- 	    &Reply($client, "$qresult\n", $userinput);
+ 	    &Reply($client, \$qresult, $userinput);
  	} else {
  	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
  		    "while attempting courseiddump\n", $userinput);
- Line 3442  sub dump_course_id_handler {
+ Line 3923  sub dump_course_id_handler {
  	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  		"while attempting courseiddump\n", $userinput);
      }
+     return 1;
+ }
+ &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
+ #
+ # Puts an unencrypted entry in a namespace db file at the domain level
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub put_domain_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$namespace,$what) =split(/:/,$tail,3);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
+                                    "P", $what);
+     if ($hashref) {
+         foreach my $pair (@pairs) {
+             my ($key,$value)=split(/=/,$pair);
+             $hashref->{$key}=$value;
+         }
+         if (&untie_domain_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                      "while attempting putdom\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting putdom\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
+ # Unencrypted get from the namespace database file at the domain level.
+ # This function retrieves a keyed item from a specific named database in the
+ # domain directory.
+ #
+ # Parameters:
+ #   $cmd             - Command request keyword (get).
+ #   $tail            - Tail of the command.  This is a colon separated list
+ #                      consisting of the domain and the 'namespace'
+ #                      which selects the gdbm file to do the lookup in,
+ #                      & separated list of keys to lookup.  Note that
+ #                      the values are returned as an & separated list too.
+ #   $client          - File descriptor open on the client.
+ # Returns:
+ #   1       - Continue processing.
+ #   0       - Exit.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub get_domain_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$client:$tail";
+     my ($udom,$namespace,$what)=split(/:/,$tail,3);
+     chomp($what);
+     my @queries=split(/\&/,$what);
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
+     if ($hashref) {
+         for (my $i=0;$i<=$#queries;$i++) {
+             $qresult.="$hashref->{$queries[$i]}&";
+         }
+         if (&untie_domain_hash($hashref)) {
+             $qresult=~s/\&$//;
+             &Reply($client, \$qresult, $userinput);
+         } else {
+             &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+                       "while attempting getdom\n",$userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                  "while attempting getdom\n",$userinput);
+     }
      return 1;
  }
- &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
+ &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
  #
  #  Puts an id to a domains id database.
- Line 3531  sub get_id_handler {
+ Line 4103  sub get_id_handler {
  	}
  	if (&untie_domain_hash($hashref)) {
  	    $qresult=~s/\&$//;
- 	    &Reply($client, "$qresult\n", $userinput);
+ 	    &Reply($client, \$qresult, $userinput);
  	} else {
  	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
  		      "while attempting idget\n",$userinput);
- Line 3655  sub dump_dcmail_handler {
+ Line 4227  sub dump_dcmail_handler {
          }
          if (&untie_domain_hash($hashref)) {
              chop($qresult);
-             &Reply($client, "$qresult\n", $userinput);
+             &Reply($client, \$qresult, $userinput);
          } else {
              &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                      "while attempting dcmaildump\n", $userinput);
- Line 3773  sub dump_domainroles_handler {
+ Line 4345  sub dump_domainroles_handler {
                  }
              }
              unless (@roles < 1) {
-                 unless (grep/^$trole$/,@roles) {
+                 unless (grep/^\Q$trole\E$/,@roles) {
                      $match = 0;
                  }
              }
- Line 3783  sub dump_domainroles_handler {
+ Line 4355  sub dump_domainroles_handler {
          }
          if (&untie_domain_hash($hashref)) {
              chop($qresult);
-             &Reply($client, "$qresult\n", $userinput);
+             &Reply($client, \$qresult, $userinput);
          } else {
              &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                      "while attempting domrolesdump\n", $userinput);
- Line 3819  sub tmp_put_handler {
+ Line 4391  sub tmp_put_handler {
      my $userinput = "$cmd:$what";	# Reconstruct for logging.
+     my ($record,$context) = split(/:/,$what);
-     my $store;
+     if ($context ne '') {
+         chomp($context);
+         $context = &unescape($context);
+     }
+     my ($id,$store);
      $tmpsnum++;
-     my $id=$$.'_'.$clientip.'_'.$tmpsnum;
+     if ($context eq 'resetpw') {
+         $id = &md5_hex(&md5_hex(time.{}.rand().$$));
+     } else {
+         $id = $$.'_'.$clientip.'_'.$tmpsnum;
+     }
      $id=~s/\W/\_/g;
-     $what=~s/\n//g;
+     $record=~s/\n//g;
      my $execdir=$perlvar{'lonDaemons'};
      if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
- 	print $store $what;
+ 	print $store $record;
  	close $store;
- 	&Reply($client, "$id\n", $userinput);
+ 	&Reply($client, \$id, $userinput);
      } else {
  	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
  		  "while attempting tmpput\n", $userinput);
- Line 3863  sub tmp_get_handler {
+ Line 4443  sub tmp_get_handler {
      my $execdir=$perlvar{'lonDaemons'};
      if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
  	my $reply=<$store>;
- 	&Reply( $client, "$reply\n", $userinput);
+ 	&Reply( $client, \$reply, $userinput);
  	close $store;
      } else {
  	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
- Line 4044  sub enrollment_enabled_handler {
+ Line 4624  sub enrollment_enabled_handler {
      my $userinput = $cmd.":".$tail; # For logging purposes.
-     my $cdom = split(/:/, $tail);   # Domain we're asking about.
+     my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
      my $outcome  = &localenroll::run($cdom);
-     &Reply($client, "$outcome\n", $userinput);
+     &Reply($client, \$outcome, $userinput);
      return 1;
  }
- Line 4073  sub get_sections_handler {
+ Line 4654  sub get_sections_handler {
      my @secs = &localenroll::get_sections($coursecode,$cdom);
      my $seclist = &escape(join(':',@secs));
-     &Reply($client, "$seclist\n", $userinput);
+     &Reply($client, \$seclist, $userinput);
      return 1;
- Line 4100  sub validate_course_owner_handler {
+ Line 4681  sub validate_course_owner_handler {
      my $userinput = "$cmd:$tail";
      my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
+     $owner = &unescape($owner);
      my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
-     &Reply($client, "$outcome\n", $userinput);
+     &Reply($client, \$outcome, $userinput);
- Line 4132  sub validate_course_section_handler {
+ Line 4714  sub validate_course_section_handler {
      my ($inst_course_id, $cdom) = split(/:/, $tail);
      my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
-     &Reply($client, "$outcome\n", $userinput);
+     &Reply($client, \$outcome, $userinput);
      return 1;
- Line 4140  sub validate_course_section_handler {
+ Line 4722  sub validate_course_section_handler {
  &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
  #
- #   Create a password for a new auto-enrollment user.
+ #   Validate course owner's access to enrollment data for specific class section.
- #   I think/guess, this password allows access to the institutions
+ #
- #   AIS class list server/services.  Stuart can correct this comment
+ #
- #   when he finds out how wrong I am.
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - The tail of the command.   In this case this is a colon separated
+ #               set of words that will be split into:
+ #               $inst_class  - Institutional code for the specific class section
+ #               $courseowner - The escaped username:domain of the course owner
+ #               $cdom        - The domain of the course from the institution's
+ #                              point of view.
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ #
+ sub validate_class_access_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_class,$ownerlist,$cdom) = split(/:/, $tail);
+     my $owners = &unescape($ownerlist);
+     my $outcome;
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$outcome=&localenroll::check_section($inst_class,$owners,$cdom);
+     };
+     &Reply($client,\$outcome, $userinput);
+     return 1;
+ }
+ &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
+ #
+ #   Create a password for a new LON-CAPA user added by auto-enrollment.
+ #   Only used for case where authentication method for new user is localauth
  #
  # Formal Parameters:
  #    $cmd     - The command request that got us dispatched.
  #    $tail    - The tail of the command.   In this case this is a colon separated
  #               set of words that will be split into:
- #               $authparam - An authentication parameter (username??).
+ #               $authparam - An authentication parameter (localauth parameter).
  #               $cdom      - The domain of the course from the institution's
  #                            point of view.
  #    $client  - The socket open on the client.
- Line 4256  sub get_institutional_code_format_handle
+ Line 4869  sub get_institutional_code_format_handle
  						    \%cat_titles,
  						    \%cat_order);
      if ($formatreply eq 'ok') {
- 	my $codes_str = &hash2str(%codes);
+ 	my $codes_str = &Apache::lonnet::hash2str(%codes);
- 	my $codetitles_str = &array2str(@codetitles);
+ 	my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
- 	my $cat_titles_str = &hash2str(%cat_titles);
+ 	my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
- 	my $cat_order_str = &hash2str(%cat_order);
+ 	my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
  	&Reply($client,
  	       $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
  	       .$cat_order_str."\n",
- Line 4276  sub get_institutional_code_format_handle
+ Line 4889  sub get_institutional_code_format_handle
  &register_handler("autoinstcodeformat",
  		  \&get_institutional_code_format_handler,0,1,0);
+ sub get_institutional_defaults_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = $tail;
+     my %defaults_hash;
+     my @code_order;
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
+                                                    \@code_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             while (my ($key,$value) = each(%defaults_hash)) {
+                 $result.=&escape($key).'='.&escape($value).'&';
+             }
+             $result .= 'code_order='.&escape(join('&',@code_order));
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("autoinstcodedefaults",
+                   \&get_institutional_defaults_handler,0,1,0);
+ sub get_institutional_user_rules {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = &unescape($tail);
+     my (%rules_hash,@rules_order);
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::username_rules($dom,\%rules_hash,\@rules_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result;
+             foreach my $key (keys(%rules_hash)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
+             }
+             $result =~ s/\&$//;
+             $result .= ':';
+             if (@rules_order > 0) {
+                 foreach my $item (@rules_order) {
+                     $result .= &escape($item).'&';
+                 }
+             }
+             $result =~ s/\&$//;
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instuserrules",\&get_institutional_user_rules,0,1,0);
+ sub get_institutional_id_rules {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = &unescape($tail);
+     my (%rules_hash,@rules_order);
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::id_rules($dom,\%rules_hash,\@rules_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result;
+             foreach my $key (keys(%rules_hash)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
+             }
+             $result =~ s/\&$//;
+             $result .= ':';
+             if (@rules_order > 0) {
+                 foreach my $item (@rules_order) {
+                     $result .= &escape($item).'&';
+                 }
+             }
+             $result =~ s/\&$//;
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instidrules",\&get_institutional_id_rules,0,1,0);
+ sub get_institutional_selfcreate_rules {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = &unescape($tail);
+     my (%rules_hash,@rules_order);
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::selfcreate_rules($dom,\%rules_hash,\@rules_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result;
+             foreach my $key (keys(%rules_hash)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
+             }
+             $result =~ s/\&$//;
+             $result .= ':';
+             if (@rules_order > 0) {
+                 foreach my $item (@rules_order) {
+                     $result .= &escape($item).'&';
+                 }
+             }
+             $result =~ s/\&$//;
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instemailrules",\&get_institutional_selfcreate_rules,0,1,0);
+ sub institutional_username_check {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my %rulecheck;
+     my $outcome;
+     my ($udom,$uname,@rules) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $uname = &unescape($uname);
+     @rules = map {&unescape($_);} (@rules);
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::username_check($udom,$uname,\@rules,\%rulecheck);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             foreach my $key (keys(%rulecheck)) {
+                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
+             }
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instrulecheck",\&institutional_username_check,0,1,0);
+ sub institutional_id_check {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my %rulecheck;
+     my $outcome;
+     my ($udom,$id,@rules) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $id = &unescape($id);
+     @rules = map {&unescape($_);} (@rules);
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::id_check($udom,$id,\@rules,\%rulecheck);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             foreach my $key (keys(%rulecheck)) {
+                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
+             }
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instidrulecheck",\&institutional_id_check,0,1,0);
+ sub institutional_selfcreate_check {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my %rulecheck;
+     my $outcome;
+     my ($udom,$email,@rules) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $email = &unescape($email);
+     @rules = map {&unescape($_);} (@rules);
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::selfcreate_check($udom,$email,\@rules,\%rulecheck);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             foreach my $key (keys(%rulecheck)) {
+                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
+             }
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instselfcreatecheck",\&institutional_selfcreate_check,0,1,0);
  # Get domain specific conditions for import of student photographs to a course
  #
  # Retrieves information from photo_permission subroutine in localenroll.
- Line 4403  sub student_photo_handler {
+ Line 5237  sub student_photo_handler {
  }
  &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
+ sub inst_usertypes_handler {
+     my ($cmd, $domain, $client) = @_;
+     my $res;
+     my $userinput = $cmd.":".$domain; # For logging purposes.
+     my (%typeshash,@order,$result);
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
+     };
+     if ($result eq 'ok') {
+         if (keys(%typeshash) > 0) {
+             foreach my $key (keys(%typeshash)) {
+                 $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
+             }
+         }
+         $res=~s/\&$//;
+         $res .= ':';
+         if (@order > 0) {
+             foreach my $item (@order) {
+                 $res .= &escape($item).'&';
+             }
+         }
+         $res=~s/\&$//;
+     }
+     &Reply($client, \$res, $userinput);
+     return 1;
+ }
+ &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
  # mkpath makes all directories for a file, expects an absolute path with a
  # file or a trailing / if just a dir is passed
  # returns 1 on success 0 on failure
- Line 4666  sub catchexception {
+ Line 5529  sub catchexception {
      $SIG{__DIE__}='DEFAULT';
      &status("Catching exception");
      &logthis("<font color='red'>CRITICAL: "
-      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
+      ."ABNORMAL EXIT. Child $$ for server ".$perlvar{'lonHostID'}." died through "
       ."a crash with this error msg->[$error]</font>");
      &logthis('Famous last words: '.$status.' - '.$lastlog);
      if ($client) { print $client "error: $error\n"; }
- Line 4777  sub HUPSMAN {                      # sig
+ Line 5640  sub HUPSMAN {                      # sig
  }
  #
- #    Kill off hashes that describe the host table prior to re-reading it.
- #    Hashes affected are:
- #       %hostid, %hostdom %hostip %hostdns.
- #
- sub KillHostHashes {
-     foreach my $key (keys %hostid) {
- 	delete $hostid{$key};
-     }
-     foreach my $key (keys %hostdom) {
- 	delete $hostdom{$key};
-     }
-     foreach my $key (keys %hostip) {
- 	delete $hostip{$key};
-     }
-     foreach my $key (keys %hostdns) {
- 	delete $hostdns{$key};
-     }
- }
- #
- #   Read in the host table from file and distribute it into the various hashes:
- #
- #    - %hostid  -  Indexed by IP, the loncapa hostname.
- #    - %hostdom -  Indexed by  loncapa hostname, the domain.
- #    - %hostip  -  Indexed by hostid, the Ip address of the host.
- sub ReadHostTable {
-     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
-     my $myloncapaname = $perlvar{'lonHostID'};
-     Debug("My loncapa name is : $myloncapaname");
-     my %name_to_ip;
-     while (my $configline=<CONFIG>) {
- 	if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
- 	    my ($id,$domain,$role,$name)=split(/:/,$configline);
- 	    $name=~s/\s//g;
- 	    my $ip;
- 	    if (!exists($name_to_ip{$name})) {
- 		$ip = gethostbyname($name);
- 		if (!$ip || length($ip) ne 4) {
- 		    &logthis("Skipping host $id name $name no IP found\n");
- 		    next;
- 		}
- 		$ip=inet_ntoa($ip);
- 		$name_to_ip{$name} = $ip;
- 	    } else {
- 		$ip = $name_to_ip{$name};
- 	    }
- 	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
- 	    $hostdom{$id}=$domain;    # LonCAPA domain name of host.
- 	    $hostname{$id}=$name;     # LonCAPA name -> DNS name
- 	    $hostip{$id}=$ip;         # IP address of host.
- 	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
- 	    if ($id eq $perlvar{'lonHostID'}) {
- 		Debug("Found me in the host table: $name");
- 		$thisserver=$name;
- 	    }
- 	}
-     }
-     close(CONFIG);
- }
- #
  #  Reload the Apache daemon's state.
  #  This is done by invoking /home/httpd/perl/apachereload
  #  a setuid perl script that can be root for us to do this job.
- Line 4868  sub UpdateHosts {
+ Line 5670  sub UpdateHosts {
      #  either dropped or changed hosts.  Note that the re-read of the table
      #  will take care of new and changed hosts as connections come into being.
+     &Apache::lonnet::reset_hosts_info();
-     KillHostHashes;
+     foreach my $child (keys(%children)) {
-     ReadHostTable;
-     foreach my $child (keys %children) {
  	my $childip = $children{$child};
- 	if(!$hostid{$childip}) {
+ 	if ($childip ne '127.0.0.1'
+ 	    && !defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
  	    logthis('<font color="blue"> UpdateHosts killing child '
  		    ." $child for ip $childip </font>");
  	    kill('INT', $child);
- Line 4959  sub Debug {
+ Line 5760  sub Debug {
  #
  sub Reply {
      my ($fd, $reply, $request) = @_;
-     print $fd $reply;
+     if (ref($reply)) {
-     Debug("Request was $request  Reply was $reply");
+ 	print $fd $$reply;
+ 	print $fd "\n";
+ 	if ($DEBUG) { Debug("Request was $request  Reply was $$reply"); }
+     } else {
+ 	print $fd $reply;
+ 	if ($DEBUG) { Debug("Request was $request  Reply was $reply"); }
+     }
      $Transactions++;
  }
- Line 5034  sub status {
+ Line 5840  sub status {
      $0='lond: '.$what.' '.$local;
  }
- # ----------------------------------------------------------- Send USR1 to lonc
- sub reconlonc {
-     my $peerfile=shift;
-     &logthis("Trying to reconnect for $peerfile");
-     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
-     if (my $fh=IO::File->new("$loncfile")) {
- 	my $loncpid=<$fh>;
-         chomp($loncpid);
-         if (kill 0 => $loncpid) {
- 	    &logthis("lonc at pid $loncpid responding, sending USR1");
-             kill USR1 => $loncpid;
-         } else {
- 	    &logthis(
-               "<font color='red'>CRITICAL: "
-              ."lonc at pid $loncpid not responding, giving up</font>");
-         }
-     } else {
-       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
-     }
- }
- # -------------------------------------------------- Non-critical communication
- sub subreply {
-     my ($cmd,$server)=@_;
-     my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
-     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
-                                       Type    => SOCK_STREAM,
-                                       Timeout => 10)
-        or return "con_lost";
-     print $sclient "sethost:$server:$cmd\n";
-     my $answer=<$sclient>;
-     chomp($answer);
-     if (!$answer) { $answer="con_lost"; }
-     return $answer;
- }
- sub reply {
-   my ($cmd,$server)=@_;
-   my $answer;
-   if ($server ne $currenthostid) {
-     $answer=subreply($cmd,$server);
-     if ($answer eq 'con_lost') {
- 	$answer=subreply("ping",$server);
-         if ($answer ne $server) {
- 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
-            &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});
-         }
-         $answer=subreply($cmd,$server);
-     }
-   } else {
-     $answer='self_reply';
-   }
-   return $answer;
- }
  # -------------------------------------------------------------- Talk to lonsql
  sub sql_reply {
- Line 5159  $SIG{USR1} = \&checkchildren;
+ Line 5908  $SIG{USR1} = \&checkchildren;
  $SIG{USR2} = \&UpdateHosts;
  #  Read the host hashes:
+ &Apache::lonnet::load_hosts_tab();
- ReadHostTable;
  my $dist=`$perlvar{'lonDaemons'}/distprobe`;
- Line 5239  sub make_new_child {
+ Line 5987  sub make_new_child {
  #        my $tmpsnum=0;            # Now global
  #---------------------------------------------------- kerberos 5 initialization
          &Authen::Krb5::init_context();
- 	unless (($dist eq 'fedora4') || ($dist eq 'suse9.3')) {
+ 	unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||
+ 		($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
  	    &Authen::Krb5::init_ets();
  	}
- Line 5249  sub make_new_child {
+ Line 5998  sub make_new_child {
  # -----------------------------------------------------------------------------
  	# see if we know client and 'check' for spoof IP by ineffective challenge
- 	ReadManagerTable;	# May also be a manager!!
  	my $outsideip=$clientip;
  	if ($clientip eq '127.0.0.1') {
- 	    $outsideip=$hostip{$perlvar{'lonHostID'}};
+ 	    $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
  	}
+ 	&ReadManagerTable();
- 	my $clientrec=($hostid{$outsideip}     ne undef);
+ 	my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
  	my $ismanager=($managers{$outsideip}    ne undef);
  	$clientname  = "[unknonwn]";
  	if($clientrec) {	# Establish client type.
  	    $ConnectionType = "client";
- 	    $clientname = $hostid{$outsideip};
+ 	    $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
  	    if($ismanager) {
  		$ConnectionType = "both";
  	    }
- Line 5280  sub make_new_child {
+ Line 6027  sub make_new_child {
  	    my $remotereq=<$client>;
  	    chomp($remotereq);
  	    Debug("Got init: $remotereq");
- 	    my $inikeyword = split(/:/, $remotereq);
  	    if ($remotereq =~ /^init/) {
  		&sethost("sethost:$perlvar{'lonHostID'}");
  		#
- Line 5368  sub make_new_child {
+ Line 6115  sub make_new_child {
  	if ($clientok) {
  # ---------------- New known client connecting, could mean machine online again
+ 	    if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip
- 	    foreach my $id (keys(%hostip)) {
+ 		&& $clientip ne '127.0.0.1') {
- 		if ($hostip{$id} ne $clientip ||
+ 		&Apache::lonnet::reconlonc($clientname);
- 		    $hostip{$currenthostid} eq $clientip) {
- 		    # no need to try to do recon's to myself
- 		    next;
- 		}
- 		&reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id});
  	    }
  	    &logthis("<font color='green'>Established connection: $clientname</font>");
  	    &status('Will listen to '.$clientname);
- Line 5578  sub get_auth_type
+ Line 6320  sub get_auth_type
  #     0        - The domain,user,password triplet is not a valid user.
  #
  sub validate_user {
-     my ($domain, $user, $password) = @_;
+     my ($domain, $user, $password, $checkdefauth) = @_;
      # Why negative ~pi you may well ask?  Well this function is about
      # authentication, and therefore very important to get right.
- Line 5602  sub validate_user {
+ Line 6343  sub validate_user {
      my $null = pack("C",0);	# Used by kerberos auth types.
+     if ($howpwd eq 'nouser') {
+         if ($checkdefauth) {
+             my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
+             if ($domdefaults{'auth_def'} eq 'localauth') {
+                 $howpwd = $domdefaults{'auth_def'};
+                 $contentpwd = $domdefaults{'auth_arg_def'};
+             } elsif ((($domdefaults{'auth_def'} eq 'krb4') ||
+                       ($domdefaults{'auth_def'} eq 'krb5')) &&
+                      ($domdefaults{'auth_arg_def'} ne '')) {
+                 $howpwd = $domdefaults{'auth_def'};
+                 $contentpwd = $domdefaults{'auth_arg_def'};
+             }
+         }
+     }
      if ($howpwd ne 'nouser') {
  	if($howpwd eq "internal") { # Encrypted is in local password file.
  	    $validated = (crypt($password, $contentpwd) eq $contentpwd);
  	}
- Line 5652  sub validate_user {
+ Line 6406  sub validate_user {
  		my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
  		my $krbserver  = &Authen::Krb5::parse_name($krbservice);
  		my $credentials= &Authen::Krb5::cc_default();
- 		$credentials->initialize($krbclient);
+ 		$credentials->initialize(&Authen::Krb5::parse_name($user.'@'
- 		my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
+                                                                  .$contentpwd));
- 									 $krbserver,
+                 my $krbreturn;
- 									 $password,
+                 if (exists(&Authen::Krb5::get_init_creds_password)) {
- 									 $credentials);
+                     $krbreturn =
- 		$validated = ($krbreturn == 1);
+                         &Authen::Krb5::get_init_creds_password($krbclient,$password,
+                                                                $krbservice);
+                     $validated = (ref($krbreturn) eq 'Authen::Krb5::Creds');
+                 } else {
+ 		    $krbreturn  =
+                         &Authen::Krb5::get_in_tkt_with_password($krbclient,$krbserver,
+ 		 						$password,$credentials);
+ 		    $validated = ($krbreturn == 1);
+                 }
+ 		if (!$validated) {
+ 		    &logthis('krb5: '.$user.', '.$contentpwd.', '.
+ 			     &Authen::Krb5::error());
+ 		}
  	    } else {
  		$validated = 0;
  	    }
- Line 5665  sub validate_user {
+ Line 6431  sub validate_user {
  	    #  Authenticate via installation specific authentcation method:
  	    $validated = &localauth::localauth($user,
  					       $password,
- 					       $contentpwd);
+ 					       $contentpwd,
+ 					       $domain);
+ 	    if ($validated < 0) {
+ 		&logthis("localauth for $contentpwd $user:$domain returned a $validated");
+ 		$validated = 0;
+ 	    }
  	} else {			# Unrecognized auth is also bad.
  	    $validated = 0;
  	}
- Line 5691  sub addline {
+ Line 6462  sub addline {
      my ($fname,$hostid,$ip,$newline)=@_;
      my $contents;
      my $found=0;
-     my $expr='^'.$hostid.':'.$ip.':';
+     my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
-     $expr =~ s/\./\\\./g;
      my $sh;
      if ($sh=IO::File->new("$fname.subscription")) {
  	while (my $subline=<$sh>) {
- Line 5899  sub subscribe {
+ Line 6669  sub subscribe {
                  # the metadata
  		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
  		$fname=~s/\/home\/httpd\/html\/res/raw/;
- 		$fname="http://$thisserver/".$fname;
+ 		$fname="http://".&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
  		$result="$fname\n";
  	    }
  	} else {
- Line 5942  sub change_unix_password {
+ Line 6712  sub change_unix_password {
  sub make_passwd_file {
      my ($uname, $umode,$npass,$passfilename)=@_;
-     my $result="ok\n";
+     my $result="ok";
      if ($umode eq 'krb4' or $umode eq 'krb5') {
  	{
  	    my $pf = IO::File->new(">$passfilename");
- Line 6010  sub make_passwd_file {
+ Line 6780  sub make_passwd_file {
  		if($useraddok > 0) {
  		    my $error_text = &lcuseraddstrerror($useraddok);
  		    &logthis("Failed lcuseradd: $error_text");
- 		    $result = "lcuseradd_failed:$error_text\n";
+ 		    $result = "lcuseradd_failed:$error_text";
  		}  else {
  		    my $pf = IO::File->new(">$passfilename");
  		    if($pf) {
- Line 6034  sub make_passwd_file {
+ Line 6804  sub make_passwd_file {
  	    }
  	}
      } else {
- 	$result="auth_mode_error\n";
+ 	$result="auth_mode_error";
      }
      return $result;
  }
- Line 6053  sub sethost {
+ Line 6823  sub sethost {
      }
      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
-     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
+     if (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'})
+ 	eq &Apache::lonnet::get_host_ip($hostid)) {
  	$currenthostid  =$hostid;
- 	$currentdomainid=$hostdom{$hostid};
+ 	$currentdomainid=&Apache::lonnet::host_domain($hostid);
  	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
      } else {
  	&logthis("Requested host id $hostid not an alias of ".
- Line 6071  sub version {
+ Line 6842  sub version {
      return "version:$VERSION";
  }
- #There is a copy of this in lonnet.pm
- sub userload {
-     my $numusers=0;
-     {
- 	opendir(LONIDS,$perlvar{'lonIDsDir'});
- 	my $filename;
- 	my $curtime=time;
- 	while ($filename=readdir(LONIDS)) {
- 	    if ($filename eq '.' || $filename eq '..') {next;}
- 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
- 	    if ($curtime-$mtime < 1800) { $numusers++; }
- 	}
- 	closedir(LONIDS);
-     }
-     my $userloadpercent=0;
-     my $maxuserload=$perlvar{'lonUserLoadLim'};
-     if ($maxuserload) {
- 	$userloadpercent=100*$numusers/$maxuserload;
-     }
-     $userloadpercent=sprintf("%.2f",$userloadpercent);
-     return $userloadpercent;
- }
- # 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)
- Line 6495  linux
+ Line 7176  linux
  Server/Process
  =cut
+ =pod
+ =head1 LOG MESSAGES
+ The messages below can be emitted in the lond log.  This log is located
+ in ~httpd/perl/logs/lond.log  Many log messages have HTML encapsulation
+ to provide coloring if examined from inside a web page. Some do not.
+ Where color is used, the colors are; Red for sometihhng to get excited
+ about and to follow up on. Yellow for something to keep an eye on to
+ be sure it does not get worse, Green,and Blue for informational items.
+ In the discussions below, sometimes reference is made to ~httpd
+ when describing file locations.  There isn't really an httpd
+ user, however there is an httpd directory that gets installed in the
+ place that user home directories go.  On linux, this is usually
+ (always?) /home/httpd.
+ Some messages are colorless.  These are usually (not always)
+ Green/Blue color level messages.
+ =over 2
+ =item (Red)  LocalConnection rejecting non local: <ip> ne 127.0.0.1
+ A local connection negotiation was attempted by
+ a host whose IP address was not 127.0.0.1.
+ The socket is closed and the child will exit.
+ lond has three ways to establish an encyrption
+ key with a client:
+ =over 2
+ =item local
+ The key is written and read from a file.
+ This is only valid for connections from localhost.
+ =item insecure
+ The key is generated by the server and
+ transmitted to the client.
+ =item  ssl (secure)
+ An ssl connection is negotiated with the client,
+ the key is generated by the server and sent to the
+ client across this ssl connection before the
+ ssl connectionis terminated and clear text
+ transmission resumes.
+ =back
+ =item (Red) LocalConnection: caller is insane! init = <init> and type = <type>
+ The client is local but has not sent an initialization
+ string that is the literal "init:local"  The connection
+ is closed and the child exits.
+ =item Red CRITICAL Can't get key file <error>
+ SSL key negotiation is being attempted but the call to
+ lonssl::KeyFile  failed.  This usually means that the
+ configuration file is not correctly defining or protecting
+ the directories/files lonCertificateDirectory or
+ lonnetPrivateKey
+ <error> is a string that describes the reason that
+ the key file could not be located.
+ =item (Red) CRITICAL  Can't get certificates <error>
+ SSL key negotiation failed because we were not able to retrives our certificate
+ or the CA's certificate in the call to lonssl::CertificateFile
+ <error> is the textual reason this failed.  Usual reasons:
+ =over 2
+ =item Apache config file for loncapa  incorrect:
+ one of the variables
+ lonCertificateDirectory, lonnetCertificateAuthority, or lonnetCertificate
+ undefined or incorrect
+ =item Permission error:
+ The directory pointed to by lonCertificateDirectory is not readable by lond
+ =item Permission error:
+ Files in the directory pointed to by lonCertificateDirectory are not readable by lond.
+ =item Installation error:
+ Either the certificate authority file or the certificate have not
+ been installed in lonCertificateDirectory.
+ =item (Red) CRITICAL SSL Socket promotion failed:  <err>
+ The promotion of the connection from plaintext to SSL failed
+ <err> is the reason for the failure.  There are two
+ system calls involved in the promotion (one of which failed),
+ a dup to produce
+ a second fd on the raw socket over which the encrypted data
+ will flow and IO::SOcket::SSL->new_from_fd which creates
+ the SSL connection on the duped fd.
+ =item (Blue)   WARNING client did not respond to challenge
+ This occurs on an insecure (non SSL) connection negotiation request.
+ lond generates some number from the time, the PID and sends it to
+ the client.  The client must respond by echoing this information back.
+ If the client does not do so, that's a violation of the challenge
+ protocols and the connection will be failed.
+ =item (Red) No manager table. Nobody can manage!!
+ lond has the concept of privileged hosts that
+ can perform remote management function such
+ as update the hosts.tab.   The manager hosts
+ are described in the
+ ~httpd/lonTabs/managers.tab file.
+ this message is logged if this file is missing.
+ =item (Green) Registering manager <dnsname> as <cluster_name> with <ipaddress>
+ Reports the successful parse and registration
+ of a specific manager.
+ =item Green existing host <clustername:dnsname>
+ The manager host is already defined in the hosts.tab
+ the information in that table, rather than the info in the
+ manager table will be used to determine the manager's ip.
+ =item (Red) Unable to craete <filename>
+ lond has been asked to create new versions of an administrative
+ file (by a manager).  When this is done, the new file is created
+ in a temp file and then renamed into place so that there are always
+ usable administrative files, even if the update fails.  This failure
+ message means that the temp file could not be created.
+ The update is abandoned, and the old file is available for use.
+ =item (Green) CopyFile from <oldname> to <newname> failed
+ In an update of administrative files, the copy of the existing file to a
+ backup file failed.  The installation of the new file may still succeed,
+ but there will not be a back up file to rever to (this should probably
+ be yellow).
+ =item (Green) Pushfile: backed up <oldname> to <newname>
+ See above, the backup of the old administrative file succeeded.
+ =item (Red)  Pushfile: Unable to install <filename> <reason>
+ The new administrative file could not be installed.  In this case,
+ the old administrative file is still in use.
+ =item (Green) Installed new < filename>.
+ The new administrative file was successfullly installed.
+ =item (Red) Reinitializing lond pid=<pid>
+ The lonc child process <pid> will be sent a USR2
+ signal.
+ =item (Red) Reinitializing self
+ We've been asked to re-read our administrative files,and
+ are doing so.
+ =item (Yellow) error:Invalid process identifier <ident>
+ A reinit command was received, but the target part of the
+ command was not valid.  It must be either
+ 'lond' or 'lonc' but was <ident>
+ =item (Green) isValideditCommand checking: Command = <command> Key = <key> newline = <newline>
+ Checking to see if lond has been handed a valid edit
+ command.  It is possible the edit command is not valid
+ in that case there are no log messages to indicate that.
+ =item Result of password change for  <username> pwchange_success
+ The password for <username> was
+ successfully changed.
+ =item Unable to open <user> passwd to change password
+ Could not rewrite the
+ internal password file for a user
+ =item Result of password change for <user> : <result>
+ A unix password change for <user> was attempted
+ and the pipe returned <result>
+ =item LWP GET: <message> for <fname> (<remoteurl>)
+ The lightweight process fetch for a resource failed
+ with <message> the local filename that should
+ have existed/been created was  <fname> the
+ corresponding URI: <remoteurl>  This is emitted in several
+ places.
+ =item Unable to move <transname> to <destname>
+ From fetch_user_file_handler - the user file was replicated but could not
+ be mv'd to its final location.
+ =item Looking for <domain> <username>
+ From user_has_session_handler - This should be a Debug call instead
+ it indicates lond is about to check whether the specified user has a
+ session active on the specified domain on the local host.
+ =item Client <ip> (<name>) hanging up: <input>
+ lond has been asked to exit by its client.  The <ip> and <name> identify the
+ client systemand <input> is the full exit command sent to the server.
+ =item Red CRITICAL: ABNORMAL EXIT. child <pid> for server <hostname> died through a crass with this error->[<message>].
+ A lond child terminated.  NOte that this termination can also occur when the
+ child receives the QUIT or DIE signals.  <pid> is the process id of the child,
+ <hostname> the host lond is working for, and <message> the reason the child died
+ to the best of our ability to get it (I would guess that any numeric value
+ represents and errno value).  This is immediately followed by
+ =item  Famous last words: Catching exception - <log>
+ Where log is some recent information about the state of the child.
+ =item Red CRITICAL: TIME OUT <pid>
+ Some timeout occured for server <pid>.  THis is normally a timeout on an LWP
+ doing an HTTP::GET.
+ =item child <pid> died
+ The reaper caught a SIGCHILD for the lond child process <pid>
+ This should be modified to also display the IP of the dying child
+ $children{$pid}
+ =item Unknown child 0 died
+ A child died but the wait for it returned a pid of zero which really should not
+ ever happen.
+ =item Child <which> - <pid> looks like we missed it's death
+ When a sigchild is received, the reaper process checks all children to see if they are
+ alive.  If children are dying quite quickly, the lack of signal queuing can mean
+ that a signal hearalds the death of more than one child.  If so this message indicates
+ which other one died. <which> is the ip of a dead child
+ =item Free socket: <shutdownretval>
+ The HUNTSMAN sub was called due to a SIGINT in a child process.  The socket is being shutdown.
+ for whatever reason, <shutdownretval> is printed but in fact shutdown() is not documented
+ to return anything. This is followed by:
+ =item Red CRITICAL: Shutting down
+ Just prior to exit.
+ =item Free socket: <shutdownretval>
+ The HUPSMAN sub was called due to a SIGHUP.  all children get killsed, and lond execs itself.
+ This is followed by:
+ =item (Red) CRITICAL: Restarting
+ lond is about to exec itself to restart.
+ =item (Blue) Updating connections
+ (In response to a USR2).  All the children (except the one for localhost)
+ are about to be killed, the hosts tab reread, and Apache reloaded via apachereload.
+ =item (Blue) UpdateHosts killing child <pid> for ip <ip>
+ Due to USR2 as above.
+ =item (Green) keeping child for ip <ip> (pid = <pid>)
+ In response to USR2 as above, the child indicated is not being restarted because
+ it's assumed that we'll always need a child for the localhost.
+ =item Going to check on the children
+ Parent is about to check on the health of the child processes.
+ Note that this is in response to a USR1 sent to the parent lond.
+ there may be one or more of the next two messages:
+ =item <pid> is dead
+ A child that we have in our child hash as alive has evidently died.
+ =item  Child <pid> did not respond
+ In the health check the child <pid> did not update/produce a pid_.txt
+ file when sent it's USR1 signal.  That process is killed with a 9 signal, as it's
+ assumed to be hung in some un-fixable way.
+ =item Finished checking children
+ Master processs's USR1 processing is cojmplete.
+ =item (Red) CRITICAL: ------- Starting ------
+ (There are more '-'s on either side).  Lond has forked itself off to
+ form a new session and is about to start actual initialization.
+ =item (Green) Attempting to start child (<client>)
+ Started a new child process for <client>.  Client is IO::Socket object
+ connected to the child.  This was as a result of a TCP/IP connection from a client.
+ =item Unable to determine who caller was, getpeername returned nothing
+ In child process initialization.  either getpeername returned undef or
+ a zero sized object was returned.  Processing continues, but in my opinion,
+ this should be cause for the child to exit.
+ =item Unable to determine clientip
+ In child process initialization.  The peer address from getpeername was not defined.
+ The client address is stored as "Unavailable" and processing continues.
+ =item (Yellow) INFO: Connection <ip> <name> connection type = <type>
+ In child initialization.  A good connectionw as received from <ip>.
+ =over 2
+ =item <name>
+ is the name of the client from hosts.tab.
+ =item <type>
+ Is the connection type which is either
+ =over 2
+ =item manager
+ The connection is from a manager node, not in hosts.tab
+ =item client
+ the connection is from a non-manager in the hosts.tab
+ =item both
+ The connection is from a manager in the hosts.tab.
+ =back
+ =back
+ =item (Blue) Certificates not installed -- trying insecure auth
+ One of the certificate file, key file or
+ certificate authority file could not be found for a client attempting
+ SSL connection intiation.  COnnection will be attemptied in in-secure mode.
+ (this would be a system with an up to date lond that has not gotten a
+ certificate from us).
+ =item (Green)  Successful local authentication
+ A local connection successfully negotiated the encryption key.
+ In this case the IDEA key is in a file (that is hopefully well protected).
+ =item (Green) Successful ssl authentication with <client>
+ The client (<client> is the peer's name in hosts.tab), has successfully
+ negotiated an SSL connection with this child process.
+ =item (Green) Successful insecure authentication with <client>
+ The client has successfully negotiated an  insecure connection withthe child process.
+ =item (Yellow) Attempted insecure connection disallowed
+ The client attempted and failed to successfully negotiate a successful insecure
+ connection.  This can happen either because the variable londAllowInsecure is false
+ or undefined, or becuse the child did not successfully echo back the challenge
+ string.
+ =back
+ =cut

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