Diff for /loncom/lond between versions 1.134 and 1.178.2.2

version 1.134, 2003/08/12 03:28:31 version 1.178.2.2, 2004/02/23 10:25:52
Line 10 Line 10
 #  #
 # LON-CAPA is free software; you can redistribute it and/or modify  # LON-CAPA is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by  # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2 of the License, or  # the Free Software Foundation; either version 2 of the License, or 
 # (at your option) any later version.  # (at your option) any later version.
 #  #
 # LON-CAPA is distributed in the hope that it will be useful,  # LON-CAPA is distributed in the hope that it will be useful,
Line 20 Line 20
 #  #
 # You should have received a copy of the GNU General Public License  # You should have received a copy of the GNU General Public License
 # along with LON-CAPA; if not, write to the Free Software  # along with LON-CAPA; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA    
 #  #
 # /home/httpd/html/adm/gpl.txt  # /home/httpd/html/adm/gpl.txt
 #  #
   
   
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # 5/26/99,6/4,6/10,6/11,6/14,6/15,6/26,6/28,6/30,  
 # 7/8,7/9,7/10,7/12,7/17,7/19,9/21,  
 # 10/7,10/8,10/9,10/11,10/13,10/15,11/4,11/16,  
 # 12/7,12/15,01/06,01/11,01/12,01/14,2/8,  
 # 03/07,05/31 Gerd Kortemeyer  
 # 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer  
 # 12/05,12/13,12/29 Gerd Kortemeyer  
 # YEAR=2001  
 # 02/12 Gerd Kortemeyer  
 # 03/24 Gerd Kortemeyer  
 # 05/11,05/28,08/30 Gerd Kortemeyer  
 # 11/26,11/27 Gerd Kortemeyer  
 # 12/22 Gerd Kortemeyer  
 # YEAR=2002  
 # 01/20/02,02/05 Gerd Kortemeyer  
 # 02/05 Guy Albertelli  
 # 02/12 Gerd Kortemeyer  
 # 02/19 Matthew Hall  
 # 02/25 Gerd Kortemeyer  
 # 01/xx/2003 Ron Fox.. Remove preforking.  This makes the general daemon  
 #      logic simpler (and there were problems maintaining the preforked  
 #      population).  Since the time averaged connection rate is close to zero  
 #      because lonc's purpose is to maintain near continuous connnections,  
 #      preforking is not really needed.  
 ###  
   
 use strict;  use strict;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
Line 68  use Authen::Krb4; Line 45  use Authen::Krb4;
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use localauth;  use localauth;
   use File::Copy;
   use LONCAPA::ConfigFileEdit;
   
 my $DEBUG = 0;       # Non zero to enable debug log entries.  my $DEBUG = 1;       # Non zero to enable debug log entries.
   
 my $status='';  my $status='';
 my $lastlog='';  my $lastlog='';
Line 80  my $currenthostid; Line 59  my $currenthostid;
 my $currentdomainid;  my $currentdomainid;
   
 my $client;  my $client;
   my $clientip;
   my $clientname;
   
   my $cipher; # Cipher key negotiated with client.
   my $tmpsnum = 0;; # Id of tmpputs.
   
 my $server;  my $server;
 my $thisserver;  my $thisserver;
   
   # 
   #   Connection type is:
   #      client                   - All client actions are allowed
   #      manager                  - only management functions allowed.
   #      both                     - Both management and client actions are allowed
   #
   
   my $ConnectionType;
   
 my %hostid;  my %hostid;
 my %hostdom;  my %hostdom;
 my %hostip;  my %hostip;
   
   my %managers; # Ip -> manager names
   
   my %perlvar; # Will have the apache conf defined perl vars.
   
   #
   #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
   #    Each element of the hash contains a reference to an array that contains:
   #          A reference to a sub that executes the request corresponding to the keyword.
   #          A flag that is true if the request must be encoded to be acceptable.
   #          A mask with bits as follows:
   #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
   #                      MANAGER_OK   - Set when the function is allowed to manager clients.
   #
   my $CLIENT_OK  = 1;
   my $MANAGER_OK = 2;
   my %Dispatcher;
   
 #  #
 #  The array below are password error strings."  #  The array below are password error strings."
 #  #
Line 115  my @adderrors    = ("ok", Line 126  my @adderrors    = ("ok",
     "lcuseradd Incorrect number of stdinput lines, must be 3",      "lcuseradd Incorrect number of stdinput lines, must be 3",
     "lcuseradd Too many other simultaneous pwd changes in progress",      "lcuseradd Too many other simultaneous pwd changes in progress",
     "lcuseradd User does not exist",      "lcuseradd User does not exist",
     "lcuseradd Unabel to mak ewww member of users's group",      "lcuseradd Unable to make www member of users's group",
     "lcuseradd Unable to su to root",      "lcuseradd Unable to su to root",
     "lcuseradd Unable to set password",      "lcuseradd Unable to set password",
     "lcuseradd Usrname has invbalid charcters",      "lcuseradd Usrname has invalid characters",
     "lcuseradd Password has an invalid character",      "lcuseradd Password has an invalid character",
     "lcuseradd User already exists",      "lcuseradd User already exists",
     "lcuseradd Could not add user.",      "lcuseradd Could not add user.",
     "lcuseradd Password mismatch");      "lcuseradd Password mismatch");
   
   #
   #   Statistics that are maintained and dislayed in the status line.
   #
   my $Transactions; # Number of attempted transactions.
   my $Failures; # Number of transcations failed.
   
   #   ResetStatistics: 
   #      Resets the statistics counters:
   #
   sub ResetStatistics {
       $Transactions = 0;
       $Failures     = 0;
   }
   
   #
   #   Return true if client is a manager.
   #
   sub isManager {
       return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
   }
   #
   #   Return tru if client can do client functions
   #
   sub isClient {
       return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
   }
   
   
   #
   #   Get a Request:
   #   Gets a Request message from the client.  The transaction
   #   is defined as a 'line' of text.  We remove the new line
   #   from the text line.  
   #   
   sub GetRequest {
       my $input = <$client>;
       chomp($input);
   
       Debug("Request = $input\n");
   
       &status('Processing '.$clientname.':'.$input);
   
       return $input;
   }
   #
   #   Decipher encoded traffic
   #  Parameters:
   #     input      - Encoded data.
   #  Returns:
   #     Decoded data or undef if encryption key was not yet negotiated.
   #  Implicit input:
   #     cipher  - This global holds the negotiated encryption key.
   #
   sub Decipher {
      my $input  = shift;
      my $output = '';
      
      
      if($cipher) {
         my($enc, $enclength, $encinput) = split(/:/, $input);
         for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
            $output .= 
               $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
         }
         return substr($output, 0, $enclength);
      } else {
         return undef;
      }
      
   }
   
   #
   #   Register a command processor.  This function is invoked to register a sub
   #   to process a request.  Once registered, the ProcessRequest sub can automatically
   #   dispatch requests to an appropriate sub, and do the top level validity checking
   #   as well:
   #    - Is the keyword recognized.
   #    - Is the proper client type attempting the request.
   #    - Is the request encrypted if it has to be.
   #   Parameters:
   #    $RequestName         - Name of the request being registered.
   #                           This is the command request that will match
   #                           against the hash keywords to lookup the information
   #                           associated with the dispatch information.
   #    $Procedure           - Reference to a sub to call to process the request.
   #                           All subs get called as follows:
   #                             Procedure($cmd, $tail, $replyfd, $key)
   #                             $cmd    - the actual keyword that invoked us.
   #                             $tail   - the tail of the request that invoked us.
   #                             $replyfd- File descriptor connected to the client
   #    $MustEncode          - True if the request must be encoded to be good.
   #    $ClientOk            - True if it's ok for a client to request this.
   #    $ManagerOk           - True if it's ok for a manager to request this.
   # Side effects:
   #      - On success, the Dispatcher hash has an entry added for the key $RequestName
   #      - On failure, the program will die as it's a bad internal bug to try to 
   #        register a duplicate command handler.
   #
   sub RegisterHandler {
      my $RequestName    = shift;
      my $Procedure      = shift;
      my $MustEncode     = shift;
      my $ClientOk       = shift;
      my $ManagerOk      = shift;
      
      #  Don't allow duplication#
      
      if (defined $Dispatcher{$RequestName}) {
         die "Attempting to define a duplicate request handler for $RequestName\n";
      }
      #   Build the client type mask:
      
      my $ClientTypeMask = 0;
      if($ClientOk) {
         $ClientTypeMask  |= $CLIENT_OK;
      }
      if($ManagerOk) {
         $ClientTypeMask  |= $MANAGER_OK;
      }
      
      #  Enter the hash:
         
      my @entry = ($Procedure, $MustEncode, $ClientTypeMask);
      
      $Dispatcher{$RequestName} = \@entry;
      
      
   }
   
   #--------------------- Request Handlers --------------------------------------------
   #
   #   By convention each request handler registers itself prior to the sub declaration:
   #
   
   #  Handles ping requests.
   #  Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host we are
   #                       known as.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   
   sub PingHandler {
      my $cmd    = shift;
      my $tail   = shift;
      my $client = shift;
      
      Reply( $client,"$currenthostid\n","$cmd:$tail");
      
      return 1;
   }
   RegisterHandler("ping", \&PingHandler, 0, 1, 1);       # Ping unencoded, client or manager.
   #
   # Handles pong reequests:
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host we are
   #                       connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   
   sub PongHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $replyfd = shift;
   
      my $reply=&reply("ping",$clientname);
      Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
      return 1;
   }
   RegisterHandler("pong", \&PongHandler, 0, 1, 1);       # Pong unencoded, client or manager
   
   #
   #   EstablishKeyHandler:
   #      Called to establish an encrypted session key with the remote client.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Implicit Outputs:
   #      Reply information is sent to the client.
   #      $cipher is set with a reference to a new IDEA encryption object.
   #
   sub EstablishKeyHandler {
      my $cmd      = shift;
      my $tail     = shift;
      my $replyfd  = shift;
   
      my $buildkey=time.$$.int(rand 100000);
      $buildkey=~tr/1-6/A-F/;
      $buildkey=int(rand 100000).$buildkey.int(rand 100000);
      my $key=$currenthostid.$clientname;
      $key=~tr/a-z/A-Z/;
      $key=~tr/G-P/0-9/;
      $key=~tr/Q-Z/0-9/;
      $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
      $key=substr($key,0,32);
      my $cipherkey=pack("H32",$key);
      $cipher=new IDEA $cipherkey;
      Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
      
      return 1;
   
   }
   RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1);
   
   #  LoadHandler:
   #     Handler for the load command.  Returns the current system load average
   #     to the requestor.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   sub LoadHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $replyfd = shift;
   
      # Get the load average from /proc/loadavg and calculate it as a percentage of
      # the allowed load limit as set by the perl global variable lonLoadLim
   
      my $loadavg;
      my $loadfile=IO::File->new('/proc/loadavg');
      
      $loadavg=<$loadfile>;
      $loadavg =~ s/\s.*//g;                       # Extract the first field only.
      
      my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
   
      Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
      
      return 1;
   }
   RegisterHandler("load", \&LoadHandler, 0, 1, 0);
   
   
   #
   #   Process the userload request.  This sub returns to the client the current
   #  user load average.  It can be invoked either by clients or managers.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit inputs:
   #     whatever the userload() function requires.
   #  Implicit outputs:
   #     the reply is written to the client.
   #
   sub UserLoadHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $replyfd = shift;
   
      my $userloadpercent=&userload();
      Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
   
      return 1;
   }
   RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0);
   
   #   Process a request for the authorization type of a user:
   #   (userauth).
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit outputs:
   #    The user authorization type is written to the client.
   #
   sub UserAuthorizationType {
      my $cmd     = shift;
      my $tail    = shift;
      my $replyfd = shift;
      
      my $userinput = "$cmd:$tail";
      
      #  Pull the domain and username out of the command tail.
      # and call GetAuthType to determine the authentication type.
      
      my ($udom,$uname)=split(/:/,$tail);
      my $result = GetAuthType($udom, $uname);
      if($result eq "nouser") {
         Failure( $replyfd, "unknown_user\n", $userinput);
      } else {
         Reply( $replyfd, "$result\n", $userinput);
      }
     
      return 1;
   }
   RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0);
   #
   #   Process a request by a manager to push a hosts or domain table 
   #   to us.  We pick apart the command and pass it on to the subs
   #   that already exist to do this.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $client - File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit Output:
   #    a reply is written to the client.
   
   sub PushFileHandler {
      my $cmd    = shift;
      my $tail   = shift;
      my $client = shift;
   
      my $userinput = "$cmd:$tail";
   
      # At this time we only know that the IP of our partner is a valid manager
      # the code below is a hook to do further authentication (e.g. to resolve
      # spoofing).
   
      my $cert = GetCertificate($userinput);
      if(ValidManager($cert)) { 
   
         # Now presumably we have the bona fides of both the peer host and the
         # process making the request.
         
         my $reply = PushFile($userinput);
         Reply($client, "$reply\n", $userinput);
   
      } else {
         Failure( $client, "refused\n", $userinput);
      } 
   }
   RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1);
   
   
   
   #   Process a reinit request.  Reinit requests that either
   #   lonc or lond be reinitialized so that an updated 
   #   host.tab or domain.tab can be processed.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $client - File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   #  Implicit output:
   #     a reply is sent to the client.
   #
   sub ReinitProcessHandler {
      my $cmd    = shift;
      my $tail   = shift;
      my $client = shift;
      
      my $userinput = "$cmd:$tail";
      
      my $cert = GetCertificate($userinput);
      if(ValidManager($cert)) {
         chomp($userinput);
         my $reply = ReinitProcess($userinput);
         Reply( $client,  "$reply\n", $userinput);
      } else {
         Failure( $client, "refused\n", $userinput);
    }
      return 1;
   }
   
   RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1);
   
   #  Process the editing script for a table edit operation.
   #  the editing operation must be encrypted and requested by
   #  a manager host.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $client - File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   #  Implicit output:
   #     a reply is sent to the client.
   #
   sub EditTableHandler {
      my $command    = shift;
      my $tail       = shift;
      my $client     = shift;
      
      my $userinput = "$command:$tail";
   
      my $cert = GetCertificate($userinput);
      if(ValidManager($cert)) {
         my($filetype, $script) = split(/:/, $tail);
         if (($filetype eq "hosts") || 
             ($filetype eq "domain")) {
            if($script ne "") {
               Reply($client,            # BUGBUG - EditFile
                     EditFile($userinput), #   could fail.
                     $userinput);
            } else {
               Failure($client,"refused\n",$userinput);
            }
         } else {
            Failure($client,"refused\n",$userinput);
         }
      } else {
         Failure($client,"refused\n",$userinput);
      }
      return 1;
   }
   RegisterHandler("edit", \&EditTableHandler, 1, 0, 1);
   
   
   #
   #   Authenticate a user against the LonCAPA authentication
   #   database.  Note that there are several authentication
   #   possibilities:
   #   - unix     - The user can be authenticated against the unix
   #                password file.
   #   - internal - The user can be authenticated against a purely 
   #                internal per user password file.
   #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
   #                ticket granting authority.
   #   - user     - The person tailoring LonCAPA can supply a user authentication mechanism
   #                that is per system.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub AuthenticateHandler {
      my $cmd        = shift;
      my $tail       = shift;
      my $client     = shift;
      
      #  Regenerate the full input line 
      
      my $userinput  = $cmd.":".$tail;
   
      #  udom    - User's domain.
      #  uname   - Username.
      #  upass   - User's password.
      
      my ($udom,$uname,$upass)=split(/:/,$tail);
      Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
      chomp($upass);
      $upass=unescape($upass);
      my $proname=propath($udom,$uname);
      my $passfilename="$proname/passwd";
      
      #   The user's 'personal' loncapa passworrd file describes how to authenticate:
      
      if (-e $passfilename) {
        Debug("Located password file: $passfilename");
   
         my $pf = IO::File->new($passfilename);
         my $realpasswd=<$pf>;
         chomp($realpasswd);
         my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
         my $pwdcorrect=0;
         #
         #   Authenticate against password stored in the internal file.
         #
        Debug("Authenticating via $howpwd");
         if ($howpwd eq 'internal') {
            &Debug("Internal auth");
            $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
         #
         #   Authenticate against the unix password file.
         #
         } elsif ($howpwd eq 'unix') {
            &Debug("Unix auth");
            if((getpwnam($uname))[1] eq "") { #no such user!
               $pwdcorrect = 0;
            } else {
               $contentpwd=(getpwnam($uname))[1];
               my $pwauth_path="/usr/local/sbin/pwauth";
               unless ($contentpwd eq 'x') {
                  $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
               } elsif (-e $pwauth_path) {
                  open PWAUTH, "|$pwauth_path" or
                     die "Cannot invoke authentication";
                  print PWAUTH "$uname\n$upass\n";
                  close PWAUTH;
                  $pwdcorrect=!$?;
               }
            }
         #
         #   Authenticate against a Kerberos 4 server:
         #
         } elsif ($howpwd eq 'krb4') {
            my $null=pack("C",0);
            unless ($upass=~/$null/) {
               my $krb4_error = &Authen::Krb4::get_pw_in_tkt($uname,
                                                             "",
                                                             $contentpwd,
                                                             'krbtgt',
                                                            $contentpwd,
                                                            1,
                                                            $upass);
               if (!$krb4_error) {
                  $pwdcorrect = 1;
               } else { 
                  $pwdcorrect=0; 
                  # log error if it is not a bad password
                  if ($krb4_error != 62) {
                     &logthis('krb4:'.$uname.','.$contentpwd.','.
                              &Authen::Krb4::get_err_txt($Authen::Krb4::error));
                  }
               }
            }
         #
         #   Authenticate against a Kerberos 5 server:
         #
         } elsif ($howpwd eq 'krb5') {
            my $null=pack("C",0);
            unless ($upass=~/$null/) {
               my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
               my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
               my $krbserver=&Authen::Krb5::parse_name($krbservice);
               my $credentials=&Authen::Krb5::cc_default();
               $credentials->initialize($krbclient);
               my $krbreturn = &Authen::Krb5::get_in_tkt_with_password(
                                                                       $krbclient,
                                                                       $krbserver,
                                                                       $upass,
                                                                       $credentials);
               $pwdcorrect = ($krbreturn == 1);
            } else { 
               $pwdcorrect=0; 
            }
         #
         #  Finally, the user may have written in an authentication module.
         #  in that case, if requested, authenticate against it.
         #
         } elsif ($howpwd eq 'localauth') {
            $pwdcorrect=&localauth::localauth($uname,$upass,$contentpwd);
         }
         #
         #   Successfully authorized.
         #
         if ($pwdcorrect) {
            Reply( $client, "authorized\n", $userinput);
         #
         #  Bad credentials: Failed to authorize
         #
         } else {
            Failure( $client, "non_authorized\n", $userinput);
         }
      #
      #  User bad... note it may be bad security practice to differntiate to the
      #  caller a bad user from a  bad passwd... since that supplies covert channel
      #  information (you have a good user but bad password e.g.) to guessers.
      #
      } else {
         Failure( $client, "unknown_user\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0);
   
   #
   #   Change a user's password.  Note that this function is complicated by
   #   the fact that a user may be authenticated in more than one way:
   #   At present, we are not able to change the password for all types of
   #   authentication methods.  Only for:
   #      unix    - unix password or shadow passoword style authentication.
   #      local   - Locally written authentication mechanism.
   #   For now, kerb4 and kerb5 password changes are not supported and result
   #   in an error.
   # FUTURE WORK:
   #    Support kerberos passwd changes?
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   sub ChangePasswordHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $client  = shift;
      
      my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
   
      #
      #  udom  - user's domain.
      #  uname - Username.
      #  upass - Current password.
      #  npass - New password.
      
      my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
      chomp($npass);
      $upass=&unescape($upass);
      $npass=&unescape($npass);
      &Debug("Trying to change password for $uname");
      my $proname=propath($udom,$uname);
      my $passfilename="$proname/passwd";
      if (-e $passfilename) {
         my $realpasswd;
         { 
            my $pf = IO::File->new($passfilename);
            $realpasswd=<$pf>; 
         }
         chomp($realpasswd);
         my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
         if ($howpwd eq 'internal') {
            &Debug("internal auth");
            if (crypt($upass,$contentpwd) eq $contentpwd) {
               my $salt=time;
               $salt=substr($salt,6,2);
               my $ncpass=crypt($npass,$salt);
                  {
                     my $pf = IO::File->new(">$passfilename");
                     if ($pf) {
                        print $pf "internal:$ncpass\n";
                        &logthis("Result of password change for "
                                 ."$uname: pwchange_success");
                        Reply($client, "ok\n", $userinput);
                     } else {
                        &logthis("Unable to open $uname passwd "               
                                 ."to change password");
                        Failure( $client, "non_authorized\n",$userinput);
                     }
                  }             
            } else {
               Failure($client, "non_authorized\n", $userinput);
            }
         } elsif ($howpwd eq 'unix') {
            # Unix means we have to access /etc/password
            # one way or another.
            # First: Make sure the current password is
            #        correct
            &Debug("auth is unix");
            $contentpwd=(getpwnam($uname))[1];
            my $pwdcorrect = "0";
            my $pwauth_path="/usr/local/sbin/pwauth";
            unless ($contentpwd eq 'x') {
               $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
            } elsif (-e $pwauth_path) {
               open PWAUTH, "|$pwauth_path" or
                  die "Cannot invoke authentication";
               print PWAUTH "$uname\n$upass\n";
               close PWAUTH;
               &Debug("exited pwauth with $? ($uname,$upass) ");
               $pwdcorrect=($? == 0);
            }
            if ($pwdcorrect) {
               my $execdir=$perlvar{'lonDaemons'};
               &Debug("Opening lcpasswd pipeline");
               my $pf = IO::File->new("|$execdir/lcpasswd > "
                                       ."$perlvar{'lonDaemons'}"
                                       ."/logs/lcpasswd.log");
               print $pf "$uname\n$npass\n$npass\n";
               close $pf;
               my $err = $?;
               my $result = ($err>0 ? 'pwchange_failure' : 'ok');
               &logthis("Result of password change for $uname: ".
               &lcpasswdstrerror($?));
               Reply($client, "$result\n", $userinput);
            } else {
               Reply($client, "non_authorized\n", $userinput);
            }
         } else {
            Reply( $client, "auth_mode_error\n", $userinput);
         }  
      } else {
               Reply( $client, "unknown_user\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0);
   
   #
   #   Create a new user.  User in this case means a lon-capa user.
   #   The user must either already exist in some authentication realm
   #   like kerberos or the /etc/passwd.  If not, a user completely local to
   #   this loncapa system is created.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   sub AddUserHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $client  = shift;
      
      my $userinput = $cmd.":".$tail;   
   
      my $oldumask=umask(0077);
      my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
      &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
      chomp($npass);
      $npass=&unescape($npass);
      my $proname=propath($udom,$uname);
      my $passfilename="$proname/passwd";
      &Debug("Password file created will be:".$passfilename);
      if (-e $passfilename) {
         Failure( $client, "already_exists\n", $userinput);
      } elsif ($udom ne $currentdomainid) {
         Failure($client, "not_right_domain\n", $userinput);
      } else {
         my @fpparts=split(/\//,$proname);
         my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
         my $fperror='';
         for (my $i=3;$i<=$#fpparts;$i++) {
            $fpnow.='/'.$fpparts[$i]; 
            unless (-e $fpnow) {
               unless (mkdir($fpnow,0777)) {
                  $fperror="error: ".($!+0)." mkdir failed while attempting "
                          ."makeuser";
               }
            }
         }
         unless ($fperror) {
            my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
            Reply($client, $result, $userinput);     #BUGBUG - could be fail
         } else {
            Failure($client, "$fperror\n", $userinput);
         }
      }
      umask($oldumask);
      return 1;
   
   }
   RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);
   
   #
   #   Change the authentication method of a user.  Note that this may
   #   also implicitly change the user's password if, for example, the user is
   #   joining an existing authentication realm.  Known authentication realms at
   #   this time are:
   #    internal   - Purely internal password file (only loncapa knows this user)
   #    local      - Institutionally written authentication module.
   #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
   #    kerb4      - kerberos version 4
   #    kerb5      - kerberos version 5
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub ChangeAuthenticationHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $client  = shift;
      
      my $userinput  = "$cmd:$tail";              # Reconstruct user input.
   
      my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
      chomp($npass);
      &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
      $npass=&unescape($npass);
      my $proname=&propath($udom,$uname);
      my $passfilename="$proname/passwd";
      if ($udom ne $currentdomainid) {
         Failure( $client, "not_right_domain\n", $client);
      } else {
         my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
         Reply($client, $result, $userinput);
      }
      return 1;
   }
   RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);
   
   #
   #   Determines if this is the home server for a user.  The home server
   #   for a user will have his/her lon-capa passwd file.  Therefore all we need
   #   to do is determine if this file exists.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub IsHomeHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $client  = shift;
      
      my $userinput  = "$cmd:$tail";
      
      my ($udom,$uname)=split(/:/,$tail);
      chomp($uname);
      my $proname=propath($udom,$uname);
      if (-e $proname) {
         Reply( $client, "found\n", $userinput);
      } else {
         Failure($client, "not_found\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("home", \&IsHomeHandler, 0,1,0);
   #
   #   Process an update request for a resource?? I think what's going on here is
   #   that a resource has been modified that we hold a subscription to.
   #   If the resource is not local, then we must update, or at least invalidate our
   #   cached copy of the resource. 
   #   FUTURE WORK:
   #      I need to look at this logic carefully.  My druthers would be to follow
   #      typical caching logic, and simple invalidate the cache, drop any subscription
   #      an let the next fetch start the ball rolling again... however that may
   #      actually be more difficult than it looks given the complex web of
   #      proxy servers.
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub UpdateResourceHandler {
      my $cmd    = shift;
      my $tail   = shift;
      my $client = shift;
      
      my $userinput = "$cmd:$tail";
      
      my $fname=$tail;
      my $ownership=ishome($fname);
      if ($ownership eq 'not_owner') {
         if (-e $fname) {
            my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
                $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
            my $now=time;
            my $since=$now-$atime;
            if ($since>$perlvar{'lonExpire'}) {
               my $reply=&reply("unsub:$fname","$clientname");
               unlink("$fname");
            } else {
               my $transname="$fname.in.transfer";
               my $remoteurl=&reply("sub:$fname","$clientname");
               my $response;
               alarm(120);
               {
                  my $ua=new LWP::UserAgent;
                  my $request=new HTTP::Request('GET',"$remoteurl");
                  $response=$ua->request($request,$transname);
               }
               alarm(0);
               if ($response->is_error()) {
                  unlink($transname);
                  my $message=$response->status_line;
                  &logthis("LWP GET: $message for $fname ($remoteurl)");
               } else {
                  if ($remoteurl!~/\.meta$/) {
                     alarm(120);
                     {
                        my $ua=new LWP::UserAgent;
                        my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
                        my $mresponse=$ua->request($mrequest,$fname.'.meta');
                        if ($mresponse->is_error()) {
                           unlink($fname.'.meta');
                        }
                     }
                     alarm(0);
                  }
                  rename($transname,$fname);
               }
            }
                  Reply( $client, "ok\n", $userinput);
         } else {
            Failure($client, "not_found\n", $userinput);
         }
      } else {
         Failure($client, "rejected\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);
   
   #
   #   Fetch a user file from a remote server:
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub FetchUserFileHandler {
      my $cmd     = shift;
      my $tail    = shift;
      my $client  = shift;
      
      my $userinput = "$cmd:$tail";
      my $fname           = $tail;
      my ($udom,$uname,$ufile)=split(/\//,$fname);
      my $udir=propath($udom,$uname).'/userfiles';
      unless (-e $udir) {
         mkdir($udir,0770); 
      }
      if (-e $udir) {
         $ufile=~s/^[\.\~]+//;
         $ufile=~s/\///g;
         my $destname=$udir.'/'.$ufile;
         my $transname=$udir.'/'.$ufile.'.in.transit';
         my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
         my $response;
         alarm(120);
         {
            my $ua=new LWP::UserAgent;
            my $request=new HTTP::Request('GET',"$remoteurl");
            $response=$ua->request($request,$transname);
         }
         alarm(0);
         if ($response->is_error()) {
            unlink($transname);
            my $message=$response->status_line;
            &logthis("LWP GET: $message for $fname ($remoteurl)");
            Failure($client, "failed\n", $userinput);
         } else {
            if (!rename($transname,$destname)) {
               &logthis("Unable to move $transname to $destname");
               unlink($transname);
               Failure($client, "failed\n", $userinput);
            } else {
               Reply($client, "ok\n", $userinput);
            }
         }   
      } else {
         Failure($client, "not_home\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);
   #
   #   Authenticate access to a user file.  Question?   The token for athentication
   #   is allowed to be sent as cleartext is this really what we want?  This token
   #   represents the user's session id.  Once it is forged does this allow too much access??
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   sub AuthenticateUserFileAccess {
      my $cmd   = shift;
      my $tail    = shift;
      my $client = shift;
      my $userinput = "$cmd:$tail";
   
      my ($fname,$session)=split(/:/,$tail);
      chomp($session);
      my $reply='non_auth';
      if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {
         while (my $line=<ENVIN>) {
            if ($line=~/userfile\.$fname\=/) { 
               $reply='ok'; 
            }
         }
         close(ENVIN);
         Reply($client, $reply."\n", $userinput);
      } else {
         Failure($client, "invalid_token\n", $userinput);
      }
      return 1;
      
   }
   RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);
   #
   #   Unsubscribe from a resource.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub UnsubscribeHandler {
      my $cmd      = shift;
      my $tail     = shift;
      my $client   = shift;
      my $userinput= "$cmd:$tail";
   
      my $fname = $tail;
      if (-e $fname) {
         Reply($client, &unsub($client,$fname,$clientip), $userinput);
      } else {
         Failure($client, "not_found\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("unusb", \&UnsubscribeHandler, 0, 1, 0);
   
   #   Subscribe to a resource.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub SubscribeHandler {
      my $cmd        = shift;
      my $tail       = shift;
      my $client     = shift;
      my $userinput  = "$cmd:$tail";
   
      Reply( $client, &subscribe($userinput,$clientip), $userinput);
    
      return 1;
   }
   RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);
   
   #
   #   Determine the version of a resource (?) Or is it return
   #   the top version of the resource?  Not yet clear from the
   #   code in currentversion.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub CurrentVersionHandler {
      my $cmd      = shift;
      my $tail     = shift;
      my $client   = shift;
      my $userinput= "$cmd:$tail";
      
      my $fname   = $tail;
      Reply( $client, &currentversion($fname)."\n", $userinput);
      return 1;
   
   }
   RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);
   
   
   #  Make an entry in a user's activity log.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub ActivityLogEntryHandler {
      my $cmd      = shift;
      my $tail     = shift;
      my $client   = shift;
      my $userinput= "$cmd:$tail";
   
      my ($udom,$uname,$what)=split(/:/,$tail);
      chomp($what);
      my $proname=propath($udom,$uname);
      my $now=time;
      my $hfh;
      if ($hfh=IO::File->new(">>$proname/activity.log")) { 
         print $hfh "$now:$clientname:$what\n";
         Reply( $client, "ok\n", $userinput); 
      } else {
         Reply($client, "error: ".($!+0)." IO::File->new Failed "
               ."while attempting log\n", 
               $userinput);
      }
   
      return 1;
   }
   RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);
   #
   #   Put a namespace entry in a user profile hash.
   #   My druthers would be for this to be an encrypted interaction too.
   #   anything that might be an inadvertent covert channel about either
   #   user authentication or user personal information....
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub PutUserProfileEntry {
      my $cmd       = shift;
      my $tail      = shift;
      my $client    = shift;
      my $userinput = "$cmd:$tail";
   
      my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
      $namespace=~s/\//\_/g;
      $namespace=~s/\W//g;
      if ($namespace ne 'roles') {
         chomp($what);
         my $proname=propath($udom,$uname);
         my $now=time;
         unless ($namespace=~/^nohist\_/) {
            my $hfh;
            if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
               print $hfh "P:$now:$what\n"; 
            }
         }
         my @pairs=split(/\&/,$what);
         my %hash;
         if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
                     &GDBM_WRCREAT(),0640)) {
            foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               $hash{$key}=$value;
            }
            if (untie(%hash)) {
               Reply( $client, "ok\n", $userinput);
            } else {
               Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                     "while attempting put\n", 
                     $userinput);
            }
         } else {
            Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
            "while attempting put\n", $userinput);
         }
      } else {
         Failure( $client, "refused\n", $userinput);
      }
      
      return 1;
   }
   RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);
   
   # 
   #   Increment a profile entry in the user history file.
   #   The history contains keyword value pairs.  In this case,
   #   The value itself is a pair of numbers.  The first, the current value
   #   the second an increment that this function applies to the current
   #   value.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub IncrementUserValueHandler {
      my $cmd         = shift;
      my $tail        = shift;
      my $client      = shift;
      my $userinput   = shift;
   
      my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
      $namespace=~s/\//\_/g;
      $namespace=~s/\W//g;
      if ($namespace ne 'roles') {
         chomp($what);
         my $proname=propath($udom,$uname);
         my $now=time;
         unless ($namespace=~/^nohist\_/) {
            my $hfh;
            if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
               print $hfh "P:$now:$what\n";
            }
         }
         my @pairs=split(/\&/,$what);
         my %hash;
         if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),
                  0640)) {
            foreach my $pair (@pairs) {
               my ($key,$value)=split(/=/,$pair);
               # We could check that we have a number...
               if (! defined($value) || $value eq '') {
                  $value = 1;
               }
               $hash{$key}+=$value;
            }
            if (untie(%hash)) {
               Reply( $client, "ok\n", $userinput);
            } else {
               Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                        "while attempting put\n", $userinput);
            }
         } else {
            Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                     "while attempting put\n", $userinput);
         }
      } else {
         Failure($client, "refused\n", $userinput);
      }
   
      return 1;
   }
   RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0);
   #
   #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
   #   Each 'role' a user has implies a set of permissions.  Adding a new role
   #   for a person grants the permissions packaged with that role
   #   to that user when the role is selected.
   #
   # Parameters:
   #    $cmd       - The command string (rolesput).
   #    $tail      - The remainder of the request line.  For rolesput this
   #                 consists of a colon separated list that contains:
   #                 The domain and user that is granting the role (logged).
   #                 The domain and user that is getting the role.
   #                 The roles being granted as a set of & separated pairs.
   #                 each pair a key value pair.
   #    $client    - File descriptor connected to the client.
   # Returns:
   #     0         - If the daemon should exit
   #     1         - To continue processing.
   #
   #
   sub RolesPutHandler {
      my $cmd        = shift;
      my $tail       = shift;
      my $client     = shift;
      my $userinput  = "$cmd:$tail";
      
      my ($exedom,$exeuser,$udom,$uname,$what)   =split(/:/,$tail);
      &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
             "what = ".$what);
      my $namespace='roles';
      chomp($what);
      my $proname=propath($udom,$uname);
      my $now=time;
      #
      #  Log the attempt to set a role.  The {}'s here ensure that the file 
      #  handle is open for the minimal amount of time.  Since the flush
      #  is done on close this improves the chances the log will be an un-
      #  corrupted ordered thing.
      {
         my $hfh;
         if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
            print $hfh "P:$now:$exedom:$exeuser:$what\n";
         }
      }
      my @pairs=split(/\&/,$what);
      my %hash;
      if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {
         foreach my $pair (@pairs) {
            my ($key,$value)=split(/=/,$pair);
               &ManagePermissions($key, $udom, $uname,
                                  &GetAuthType( $udom, $uname));
               $hash{$key}=$value;
         }
         if (untie(%hash)) {
            Reply($client, "ok\n", $userinput);
         } else {
            Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                            "while attempting rolesput\n", $userinput);
         }
      } else {
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                           "while attempting rolesput\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0);  # Encoded client only.
   #
   #   Deletes (removes) a role for a user.   This is equivalent to removing
   #  a permissions package associated with the role from the user's profile.
   #
   # Parameters:
   #     $cmd                 - The command (rolesdel)
   #     $tail                - The remainder of the request line. This consists
   #                             of:
   #                             The domain and user requesting the change (logged)
   #                             The domain and user being changed.
   #                             The roles being revoked.  These are shipped to us
   #                             as a bunch of & separated role name keywords.
   #     $client              - The file handle open on the client.
   # Returns:
   #     1                    - Continue processing
   #     0                    - Exit.
   #
   sub RolesDeleteHandler {
      my $cmd          = shift;
      my $tail         = shift;
      my $client       = shift;
      my $userinput    = "$cmd:$tail";
      
      my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
      &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
             "what = ".$what);
      my $namespace='roles';
      chomp($what);
      my $proname=propath($udom,$uname);
      my $now=time;
      #
      #   Log the attempt. This {}'ing is done to ensure that the
      #   logfile is flushed and closed as quickly as possible.  Hopefully
      #   this preserves both time ordering and reduces the probability that
      #   messages will be interleaved.
      #
      {
         my $hfh;
         if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
            print $hfh "D:$now:$exedom:$exeuser:$what\n";
         }
      }
      my @rolekeys=split(/\&/,$what);
      my %hash;
      if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {
         foreach my $key (@rolekeys) {
            delete $hash{$key};
         }
         if (untie(%hash)) {
            Reply($client, "ok\n", $userinput);
         } else {
            Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                              "while attempting rolesdel\n", $userinput);
         }
      } else {
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                           "while attempting rolesdel\n", $userinput);
      }
   
      return 1;
   }
   RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only
   
   # Unencrypted get from a user's profile database.  See 
   # GetProfileEntryEncrypted for a version that does end-to-end encryption.
   # This function retrieves a keyed item from a specific named database in the
   # user's directory.
   #
   # Parameters:
   #   $cmd             - Command request keyword (get).
   #   $tail            - Tail of the command.  This is a colon separated list
   #                      consisting of the domain and username that uniquely
   #                      identifies the profile,
   #                      The 'namespace' which selects the gdbm file to 
   #                      do the lookup in, 
   #                      & separated list of keys to lookup.  Note that
   #                      the values are returned as an & separated list too.
   #   $client          - File descriptor open on the client.
   # Returns:
   #   1       - Continue processing.
   #   0       - Exit.
   #
   sub GetProfileEntry {
      my $cmd      = shift;
      my $tail     = shift;
      my $client   = shift;
      my $userinput= "$cmd:$tail";
      
      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
      $namespace=~s/\//\_/g;
      $namespace=~s/\W//g;
      chomp($what);
      my @queries=split(/\&/,$what);
      my $proname=propath($udom,$uname);
      my $qresult='';
      my %hash;
      if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {
         for (my $i=0;$i<=$#queries;$i++) {
            $qresult.="$hash{$queries[$i]}&";    # Presumably failure gives empty string.
         }
         if (untie(%hash)) {
            $qresult=~s/\&$//;              # Remove trailing & from last lookup.
            Reply($client, "$qresult\n", $userinput);
         } else {
            Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                             "while attempting get\n", $userinput);
         }
      } else {
         if ($!+0 == 2) {                # +0 coerces errno -> number 2 is ENOENT
            Failure($client, "error:No such file or ".
                             "GDBM reported bad block error\n", $userinput);
         } else {                        # Some other undifferentiated err.
            Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                              "while attempting get\n", $userinput);
         }
      }
      return 1;
   }
   RegisterHandler("get", \&GetProfileEntry, 0,1,0);
   #
   #  Process the encrypted get request.  Note that the request is sent
   #  in clear, but the reply is encrypted.  This is a small covert channel:
   #  information about the sensitive keys is given to the snooper.  Just not
   #  information about the values of the sensitive key.  Hmm if I wanted to
   #  know these I'd snoop for the egets. Get the profile item names from them
   #  and then issue a get for them since there's no enforcement of the
   #  requirement of an encrypted get for particular profile items.  If I
   #  were re-doing this, I'd force the request to be encrypted as well as the
   #  reply.  I'd also just enforce encrypted transactions for all gets since
   #  that would prevent any covert channel snooping.
   #
   #  Parameters:
   #     $cmd               - Command keyword of request (eget).
   #     $tail              - Tail of the command.  See GetProfileEntry #                          for more information about this.
   #     $client            - File open on the client.
   #  Returns:
   #     1      - Continue processing
   #     0      - server should exit.
   sub GetProfileEntryEncrypted {
      my $cmd       = shift;
      my $tail      = shift;
      my $client    = shift;
      my $userinput = "$cmd:$tail";
      
      my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
      $namespace=~s/\//\_/g;
      $namespace=~s/\W//g;
      chomp($what);
      my @queries=split(/\&/,$what);
      my $proname=propath($udom,$uname);
      my $qresult='';
      my %hash;
      if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
         for (my $i=0;$i<=$#queries;$i++) {
            $qresult.="$hash{$queries[$i]}&";
         }
         if (untie(%hash)) {
            $qresult=~s/\&$//;
            if ($cipher) {
               my $cmdlength=length($qresult);
               $qresult.="         ";
               my $encqresult='';
               for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
                  $encqresult.= unpack("H16", $cipher->encrypt(substr($qresult,
                                                                      $encidx,
                                                                      8)));
               }
               Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
            } else {
               Failure( $client, "error:no_key\n", $userinput);
            }
         } else {
            Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                                 "while attempting eget\n", $userinput);
         }
      } else {
         Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                          "while attempting eget\n", $userinput);
      }
            
      return 1;
   }
   RegisterHandler("eget", \&GetProfileEncrypted, 0, 1, 0);
   
   #
   #   Deletes a key in a user profile database.
   #   
   #   Parameters:
   #       $cmd                  - Command keyword (del).
   #       $tail                 - Command tail.  IN this case a colon
   #                               separated list containing:
   #                               The domain and user that identifies uniquely
   #                               the identity of the user.
   #                               The profile namespace (name of the profile
   #                               database file).
   #                               & separated list of keywords to delete.
   #       $client              - File open on client socket.
   # Returns:
   #     1   - Continue processing
   #     0   - Exit server.
   #
   #
   sub DeletProfileEntry {
      my $cmd      = shift;
      my $tail     = shift;
      my $client   = shift;
      my $userinput = "cmd:$tail";
   
      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
      $namespace=~s/\//\_/g;
      $namespace=~s/\W//g;
      chomp($what);
      my $proname=propath($udom,$uname);
      my $now=time;
      unless ($namespace=~/^nohist\_/) {
         my $hfh;
         if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
            print $hfh "D:$now:$what\n"; 
         }
      }
      my @keys=split(/\&/,$what);
      my %hash;
      if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
         foreach my $key (@keys) {
            delete($hash{$key});
         }
         if (untie(%hash)) {
            Reply($client, "ok\n", $userinput);
         } else {
            Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                              "while attempting del\n", $userinput);
         }
      } else {
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                           "while attempting del\n", $userinput);
      }
      return 1;
   }
   RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0);
   #
   #  List the set of keys that are defined in a profile database file.
   #  A successful reply from this will contain an & separated list of
   #  the keys. 
   # Parameters:
   #     $cmd              - Command request (keys).
   #     $tail             - Remainder of the request, a colon separated
   #                         list containing domain/user that identifies the
   #                         user being queried, and the database namespace
   #                         (database filename essentially).
   #     $client           - File open on the client.
   #  Returns:
   #    1    - Continue processing.
   #    0    - Exit the server.
   #
   sub GetProfileKeys {
      my $cmd       = shift;
      my $tail      = shift;
      my $client    = shift;
      my $userinput = "$cmd:$tail";
   
      my ($udom,$uname,$namespace)=split(/:/,$tail);
      $namespace=~s/\//\_/g;
      $namespace=~s/\W//g;
      my $proname=propath($udom,$uname);
      my $qresult='';
      my %hash;
      if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
         foreach my $key (keys %hash) {
             $qresult.="$key&";
         }
         if (untie(%hash)) {
            $qresult=~s/\&$//;
            Reply($client, "$qresult\n", $userinput);
         } else {
            Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                             "while attempting keys\n", $userinput);
         }
      } else {
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                           "while attempting keys\n", $userinput);
      }
      
      return 1;
   }
   RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);
   #
   #   Dump the contents of a user profile database.
   #   Note that this constitutes a very large covert channel too since
   #   the dump will return sensitive information that is not encrypted.
   #   The naive security assumption is that the session negotiation ensures
   #   our client is trusted and I don't believe that's assured at present.
   #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
   #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
   # 
   #  Parameters:
   #     $cmd           - The command request keyword (currentdump).
   #     $tail          - Remainder of the request, consisting of a colon
   #                      separated list that has the domain/username and
   #                      the namespace to dump (database file).
   #     $client        - file open on the remote client.
   # Returns:
   #     1    - Continue processing.
   #     0    - Exit the server.
   #
   sub DumpProfileDatabase {
      my $cmd       = shift;
      my $tail      = shift;
      my $client    = shift;
      my $userinput = "$cmd:$tail";
      
      my ($udom,$uname,$namespace) = split(/:/,$tail);
      $namespace=~s/\//\_/g;
      $namespace=~s/\W//g;
      my $qresult='';
      my $proname=propath($udom,$uname);
      my %hash;
      if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {
         # Structure of %data:
         # $data{$symb}->{$parameter}=$value;
         # $data{$symb}->{'v.'.$parameter}=$version;
         # since $parameter will be unescaped, we do not
         # have to worry about silly parameter names...
         my %data = ();                     # A hash of anonymous hashes..
         while (my ($key,$value) = each(%hash)) {
            my ($v,$symb,$param) = split(/:/,$key);
            next if ($v eq 'version' || $symb eq 'keys');
            next if (exists($data{$symb}) && 
                     exists($data{$symb}->{$param}) &&
                     $data{$symb}->{'v.'.$param} > $v);
            $data{$symb}->{$param}=$value;
            $data{$symb}->{'v.'.$param}=$v;
         }
         if (untie(%hash)) {
            while (my ($symb,$param_hash) = each(%data)) {
               while(my ($param,$value) = each (%$param_hash)){
                  next if ($param =~ /^v\./);       # Ignore versions...
                  #
                  #   Just dump the symb=value pairs separated by &
                  #
                  $qresult.=$symb.':'.$param.'='.$value.'&';
               }
            }
            chop($qresult);
            Reply($client , "$qresult\n", $userinput);
         } else {
            Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                              "while attempting currentdump\n", $userinput);
         }
      } else {
         Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                           "while attempting currentdump\n", $userinput);
      }
   
      return 1;
   }
   RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);
   #
   #   Dump a profile database with an optional regular expression
   #   to match against the keys.  In this dump, no effort is made
   #   to separate symb from version information. Presumably the
   #   databases that are dumped by this command are of a different
   #   structure.  Need to look at this and improve the documentation of
   #   both this and the currentdump handler.
   # Parameters:
   #    $cmd                     - The command keyword.
   #    $tail                    - All of the characters after the $cmd:
   #                               These are expected to be a colon
   #                               separated list containing:
   #                               domain/user - identifying the user.
   #                               namespace   - identifying the database.
   #                               regexp      - optional regular expression
   #                                             that is matched against
   #                                             database keywords to do
   #                                             selective dumps.
   #   $client                   - Channel open on the client.
   # Returns:
   #    1    - Continue processing.
   # Side effects:
   #    response is written to $client.
   #
   sub DumpWithRegexp {
     my $cmd    = shift;
     my $tail   = shift;
     my $client = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
     $namespace=~s/\//\_/g;
     $namespace=~s/\W//g;
     if (defined($regexp)) {
       $regexp=&unescape($regexp);
     } else {
       $regexp='.';
     }
     my $qresult='';
     my $proname=propath($udom,$uname);
     my %hash;
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
     &GDBM_READER(),0640)) {
       study($regexp);
       while (my ($key,$value) = each(%hash)) {
         if ($regexp eq '.') {
    $qresult.=$key.'='.$value.'&';
         } else {
    my $unescapeKey = &unescape($key);
    if (eval('$unescapeKey=~/$regexp/')) {
     $qresult.="$key=$value&";
    }
         }
       }
       if (untie(%hash)) {
         chop($qresult);
         Reply($client, "$qresult\n", $userinput);
       } else {
         Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
          "while attempting dump\n", $userinput);
       }
     } else {
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       "while attempting dump\n", $userinput);
     }
   
       return 1;
   }
   RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);
   
   #  Store an aitem in any database but the roles database.
   #
   #  Parameters:
   #    $cmd                - Request command keyword.
   #    $tail               - Tail of the request.  This is a colon
   #                          separated list containing:
   #                          domain/user - User and authentication domain.
   #                          namespace   - Name of the database being modified
   #                          rid         - Resource keyword to modify.
   #                          what        - new value associated with rid.
   #
   #    $client             - Socket open on the client.
   #
   #
   #  Returns:
   #      1 (keep on processing).
   #  Side-Effects:
   #    Writes to the client
   sub StoreHandler {
     my $cmd    = shift;
     my $tail   = shift;
     my $client = shift;
    
     my $userinput = "$cmd:$tail";
   
     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
     $namespace=~s/\//\_/g;
     $namespace=~s/\W//g;
     if ($namespace ne 'roles') {
       chomp($what);
       my $proname=propath($udom,$uname);
       my $now=time;
       unless ($namespace=~/^nohist\_/) {
         my $hfh;
         if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
    print $hfh "P:$now:$rid:$what\n"; 
         }
       }
       my @pairs=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
       &GDBM_WRCREAT(),0640)) {
         my @previouskeys=split(/&/,$hash{"keys:$rid"});
         my $key;
         $hash{"version:$rid"}++;
         my $version=$hash{"version:$rid"};
         my $allkeys=''; 
         foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $allkeys.=$key.':';
    $hash{"$version:$rid:$key"}=$value;
         }
         $hash{"$version:$rid:timestamp"}=$now;
         $allkeys.='timestamp';
         $hash{"$version:keys:$rid"}=$allkeys;
         if (untie(%hash)) {
    Reply($client, "ok\n", $userinput);
         } else {
    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    "while attempting store\n", $userinput);
         }
       } else {
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
          "while attempting store\n", $userinput);
       }
     } else {
       Failure($client, "refused\n", $userinput);
     }
   
     return 1;
   }
   RegisterHandler("store", \&StoreHandler, 0, 1, 0);
   #
   #   Restore a prior version of a resource.
   #
   #  Parameters:
   #     $cmd               - Command keyword.
   #     $tail              - Remainder of the request which consists of:
   #                          domain/user   - User and auth. domain.
   #                          namespace     - name of resource database.
   #                          rid           - Resource id.
   #    $client             - socket open on the client.
   #
   # Returns:
   #      1  indicating the caller should not yet exit.
   # Side-effects:
   #   Writes a reply to the client.
   #
   sub RestoreHandler {
     my $cmd     = shift;
     my $tail    = shift;
     my $client  = shift;
   
     my $userinput = "$cmd:$tail"; # Only used for logging purposes.
   
     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
     $namespace=~s/\//\_/g;
     $namespace=~s/\W//g;
     chomp($rid);
     my $proname=propath($udom,$uname);
     my $qresult='';
     my %hash;
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
     &GDBM_READER(),0640)) {
       my $version=$hash{"version:$rid"};
       $qresult.="version=$version&";
       my $scope;
       for ($scope=1;$scope<=$version;$scope++) {
         my $vkeys=$hash{"$scope:keys:$rid"};
    my @keys=split(/:/,$vkeys);
         my $key;
         $qresult.="$scope:keys=$vkeys&";
         foreach $key (@keys) {
    $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
         }                                  
       }
        if (untie(%hash)) {
          $qresult=~s/\&$//;
          Reply( $client, "$qresult\n", $userinput);
        } else {
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
          "while attempting restore\n", $userinput);
        }
     } else {
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       "while attempting restore\n", $userinput);
     }
     
     return 1;
   
   
   }
   RegisterHandler("restor", \&RestoreHandler, 0,1,0);
   
   #
   #   Add a chat message to to a discussion board.
   #
   # Parameters:
   #    $cmd                - Request keyword.
   #    $tail               - Tail of the command. A colon separated list
   #                          containing:
   #                          cdom    - Domain on which the chat board lives
   #                          cnum    - Identifier of the discussion group.
   #                          post    - Body of the posting.
   #   $client              - Socket open on the client.
   # Returns:
   #   1    - Indicating caller should keep on processing.
   #
   # Side-effects:
   #   writes a reply to the client.
   #
   #
   sub SendChatHandler {
     my $cmd     = shift;
     my $tail    = shift;
     my $client  = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
     &chatadd($cdom,$cnum,$newpost);
     Reply($client, "ok\n", $userinput);
   
     return 1;
   }
   RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);
   #
   #   Retrieve the set of chat messagss from a discussion board.
   #
   #  Parameters:
   #    $cmd             - Command keyword that initiated the request.
   #    $tail            - Remainder of the request after the command
   #                       keyword.  In this case a colon separated list of
   #                       chat domain    - Which discussion board.
   #                       chat id        - Discussion thread(?)
   #                       domain/user    - Authentication domain and username
   #                                        of the requesting person.
   #   $client           - Socket open on the client program.
   # Returns:
   #    1     - continue processing
   # Side effects:
   #    Response is written to the client.
   #
   sub RetrieveChatHandler {
     my $cmd      = shift;
     my $tail     = shift;
     my $client   = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
     my $reply='';
     foreach (&getchat($cdom,$cnum,$udom,$uname)) {
       $reply.=&escape($_).':';
     }
     $reply=~s/\:$//;
     Reply($client, $reply."\n", $userinput);
   
   
     return 1;
   }
   RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);
   #
   #  Initiate a query of an sql database.  SQL query repsonses get put in
   #  a file for later retrieval.  This prevents sql query results from
   #  bottlenecking the system.  Note that with loncnew, perhaps this is
   #  less of an issue since multiple outstanding requests can be concurrently
   #  serviced.
   #
   #  Parameters:
   #     $cmd       - COmmand keyword that initiated the request.
   #     $tail      - Remainder of the command after the keyword.
   #                  For this function, this consists of a query and
   #                  3 arguments that are self-documentingly labelled
   #                  in the original arg1, arg2, arg3.
   #     $client    - Socket open on the client.
   # Return:
   #    1   - Indicating processing should continue.
   # Side-effects:
   #    a reply is written to $client.
   #
   sub SendQueryHandler {
     my $cmd     = shift;
     my $tail    = shift;
     my $client  = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
     $query=~s/\n*$//g;
     Reply($client, "". sqlreply("$clientname\&$query".
         "\&$arg1"."\&$arg2"."\&$arg3")."\n",
    $userinput);
   
     return 1;
   }
   RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);
   
   #
   #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
   #   The query is submitted via a "querysend" transaction.
   #   There it is passed on to the lonsql daemon, queued and issued to
   #   mysql.
   #     This transaction is invoked when the sql transaction is complete
   #   it stores the query results in flie and indicates query completion.
   #   presumably local software then fetches this response... I'm guessing
   #   the sequence is: lonc does a querysend, we ask lonsql to do it.
   #   lonsql on completion of the query interacts with the lond of our
   #   client to do a query reply storing two files:
   #    - id     - The results of the query.
   #    - id.end - Indicating the transaction completed. 
   #    NOTE: id is a unique id assigned to the query and querysend time.
   # Parameters:
   #    $cmd        - Command keyword that initiated this request.
   #    $tail       - Remainder of the tail.  In this case that's a colon
   #                  separated list containing the query Id and the 
   #                  results of the query.
   #    $client     - Socket open on the client.
   # Return:
   #    1           - Indicating that we should continue processing.
   # Side effects:
   #    ok written to the client.
   #
   sub ReplyQueryHandler {
     my $cmd    = shift;
     my $tail   = shift;
     my $client = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($cmd,$id,$reply)=split(/:/,$userinput); 
     my $store;
     my $execdir=$perlvar{'lonDaemons'};
     if ($store=IO::File->new(">$execdir/tmp/$id")) {
       $reply=~s/\&/\n/g;
            print $store $reply;
       close $store;
       my $store2=IO::File->new(">$execdir/tmp/$id.end");
       print $store2 "done\n";
       close $store2;
       Reply($client, "ok\n", $userinput);
     }
     else {
       Failure($client, "error: ".($!+0)
       ." IO::File->new Failed ".
       "while attempting queryreply\n", $userinput);
     }
    
   
     return 1;
   }
   RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);
   #
   #  Process the courseidput query.  Not quite sure what this means
   #  at the system level sense.  It appears a gdbm file in the 
   #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
   #  a set of entries made in that database.
   #
   # Parameters:
   #   $cmd      - The command keyword that initiated this request.
   #   $tail     - Tail of the command.  In this case consists of a colon
   #               separated list contaning the domain to apply this to and
   #               an ampersand separated list of keyword=value pairs.
   #   $client   - Socket open on the client.
   # Returns:
   #   1    - indicating that processing should continue
   #
   # Side effects:
   #   reply is written to the client.
   #
   sub PutCourseIdHandler {
     my $cmd    = shift;
     my $tail   = shift;
     my $client = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($udom,$what)=split(/:/,$tail);
     chomp($what);
     $udom=~s/\W//g;
     my $proname=
       "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
     my $now=time;
     my @pairs=split(/\&/,$what);
     my %hash;
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
       foreach my $pair (@pairs) {
         my ($key,$value)=split(/=/,$pair);
         $hash{$key}=$value.':'.$now;
       }
       if (untie(%hash)) {
         Reply($client, "ok\n", $userinput);
       } else {
         Failure( $client, "error: ".($!+0)
          ." untie(GDBM) Failed ".
          "while attempting courseidput\n", $userinput);
       }
     } else {
       Failure( $client, "error: ".($!+0)
        ." tie(GDBM) Failed ".
        "while attempting courseidput\n", $userinput);
     }
   
     return 1;
   }
   RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);
   
   #  Retrieves the value of a course id resource keyword pattern
   #  defined since a starting date.  Both the starting date and the
   #  keyword pattern are optional.  If the starting date is not supplied it
   #  is treated as the beginning of time.  If the pattern is not found,
   #  it is treatred as "." matching everything.
   #
   #  Parameters:
   #     $cmd     - Command keyword that resulted in us being dispatched.
   #     $tail    - The remainder of the command that, in this case, consists
   #                of a colon separated list of:
   #                 domain   - The domain in which the course database is 
   #                            defined.
   #                 since    - Optional parameter describing the minimum
   #                            time of definition(?) of the resources that
   #                            will match the dump.
   #                 description - regular expression that is used to filter
   #                            the dump.  Only keywords matching this regexp
   #                            will be used.
   #     $client  - The socket open on the client.
   # Returns:
   #    1     - Continue processing.
   # Side Effects:
   #   a reply is written to $client.
   sub DumpCourseIdHandler {
     my $cmd    = shift;
     my $tail   = shift;
     my $client = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($udom,$since,$description) =split(/:/,$tail);
     if (defined($description)) {
       $description=&unescape($description);
     } else {
       $description='.';
     }
     unless (defined($since)) { $since=0; }
     my $qresult='';
     my $proname = "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
     my %hash;
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
       while (my ($key,$value) = each(%hash)) {
         my ($descr,$lasttime)=split(/\:/,$value);
         if ($lasttime<$since) { 
    next; 
         }
         if ($description eq '.') {
    $qresult.=$key.'='.$descr.'&';
         } else {
    my $unescapeVal = &unescape($descr);
    if (eval('$unescapeVal=~/$description/i')) {
     $qresult.="$key=$descr&";
    }
         }
       }
       if (untie(%hash)) {
         chop($qresult);
         Reply($client, "$qresult\n", $userinput);
       } else {
         Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
         "while attempting courseiddump\n", $userinput);
       }
     } else {
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);
     }
   
   
     return 1;
   }
   RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);
   #
   #  Puts an id to a domains id database. 
   #
   #  Parameters:
   #   $cmd     - The command that triggered us.
   #   $tail    - Remainder of the request other than the command. This is a 
   #              colon separated list containing:
   #              $domain  - The domain for which we are writing the id.
   #              $pairs  - The id info to write... this is and & separated list
   #                        of keyword=value.
   #   $client  - Socket open on the client.
   #  Returns:
   #    1   - Continue processing.
   #  Side effects:
   #     reply is written to $client.
   #
   sub PutIdHandler {
     my $cmd    = shift;
     my $tail   = shift;
     my $client = shift;
   
     my $userinput = "$cmd:$tail";
   
     my ($udom,$what)=split(/:/,$tail);
     chomp($what);
     $udom=~s/\W//g;
     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
     my $now=time;
     {
       my $hfh;
       if ($hfh=IO::File->new(">>$proname.hist")) { 
         print $hfh "P:$now:$what\n"; 
       }
     }
     my @pairs=split(/\&/,$what);
     my %hash;
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
       foreach my $pair (@pairs) {
         my ($key,$value)=split(/=/,$pair);
         $hash{$key}=$value;
       }
       if (untie(%hash)) {
         Reply($client, "ok\n", $userinput);
       } else {
         Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
         "while attempting idput\n", $userinput);
       }
     } else {
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting idput\n", $userinput);
     }
   
     return 1;
   }
   
   RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);
   #
   #  Retrieves a set of id values from the id database.
   #  Returns an & separated list of results, one for each requested id to the
   #  client.
   #
   # Parameters:
   #   $cmd       - Command keyword that caused us to be dispatched.
   #   $tail      - Tail of the command.  Consists of a colon separated:
   #               domain - the domain whose id table we dump
   #               ids      Consists of an & separated list of
   #                        id keywords whose values will be fetched.
   #                        nonexisting keywords will have an empty value.
   #   $client    - Socket open on the client.
   #
   # Returns:
   #    1 - indicating processing should continue.
   # Side effects:
   #   An & separated list of results is written to $client.
   #
   sub GetIdHandler {
     my $cmd    = shift;
     my $tail   = shift;
     my $client = shift;
   
     my $userinput = "$client:$tail";
   
     my ($udom,$what)=split(/:/,$tail);
     chomp($what);
     $udom=~s/\W//g;
     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
     my @queries=split(/\&/,$what);
     my $qresult='';
     my %hash;
     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
       for (my $i=0;$i<=$#queries;$i++) {
         $qresult.="$hash{$queries[$i]}&";
       }
       if (untie(%hash)) {
         $qresult=~s/\&$//;
         Reply($client, "$qresult\n", $userinput);
       } else {
         Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
          "while attempting idget\n",$userinput);
       }
     } else {
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                           "while attempting idget\n",$userinput);
     }
   
     return 1;
   }
   RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);
   #------------------------------------------------------------------------------------
   #
   #   Process a Request.  Takes a request from the client validates
   #   it and performs the operation requested by it.  Returns
   #   a response to the client.
   #
   #  Parameters:
   #      request      - A string containing the user's request.
   #  Returns:
   #      0            - Requested to exit, caller should shut down.
   #      1            - Accept additional requests from the client.
   #
   sub ProcessRequest {
      my $Request      = shift;
      my $KeepGoing    = 1; # Assume we're not asked to stop.
       
      my $wasenc=0;
      my $userinput = $Request;   # for compatibility with oldcode <yeach>
   
   
   # ------------------------------------------------------------ See if encrypted
      
      if($userinput =~ /^enc/) {
         $wasenc = 1;
         $userinput = Decipher($userinput);
         if(! $userinput) {
            Failure($client,"error:Encrypted data without negotiating key");
            return 0;                      # Break off with this imposter.
         }
      }
      # Split off the request keyword from the rest of the stuff.
      
      my ($command, $tail) = split(/:/, $userinput, 2);
   
      Debug("Command received: $command, encoded = $wasenc");
   
      
   # ------------------------------------------------------------- Normal commands
   
      # 
      #   If the command is in the hash, then execute it via the hash dispatch:
      #
      if(defined $Dispatcher{$command}) {
   
         my $DispatchInfo = $Dispatcher{$command};
         my $Handler      = $$DispatchInfo[0];
         my $NeedEncode   = $$DispatchInfo[1];
         my $ClientTypes  = $$DispatchInfo[2];
         Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");
         
         #  Validate the request:
         
         my $ok = 1;
         my $requesterprivs = 0;
         if(isClient()) {
    $requesterprivs |= $CLIENT_OK;
         }
         if(isManager()) {
    $requesterprivs |= $MANAGER_OK;
         }
         if($NeedEncode && (!$wasenc)) {
    Debug("Must encode but wasn't: $NeedEncode $wasenc");
            $ok = 0;
         }
         if(($ClientTypes & $requesterprivs) == 0) {
    Debug("Client not privileged to do this operation");
    $ok = 0;
         }
   
         if($ok) {
    Debug("Dispatching to handler $command $tail");
            $KeepGoing = &$Handler($command, $tail, $client);
         } else {
    Debug("Refusing to dispatch because ok is false");
    Failure($client, "refused", $userinput);
         }
   
   
   
   
   
   # ---------------------------------------------------------------------- tmpput
      } elsif ($userinput =~ /^tmpput/) {
         if(isClient) {
            my ($cmd,$what)=split(/:/,$userinput);
            my $store;
            $tmpsnum++;
            my $id=$$.'_'.$clientip.'_'.$tmpsnum;
            $id=~s/\W/\_/g;
            $what=~s/\n//g;
            my $execdir=$perlvar{'lonDaemons'};
            if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
               print $store $what;
               close $store;
               Reply($client, "$id\n", $userinput);
            }
            else {
               Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                              "while attempting tmpput\n", $userinput);
            }
         } else {
            Failure($client, "refused\n", $userinput);
       
         }
   
   # ---------------------------------------------------------------------- tmpget
      } elsif ($userinput =~ /^tmpget/) {
         if(isClient) {
            my ($cmd,$id)=split(/:/,$userinput);
            chomp($id);
            $id=~s/\W/\_/g;
            my $store;
            my $execdir=$perlvar{'lonDaemons'};
            if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
               my $reply=<$store>;
               Reply( $client, "$reply\n", $userinput);
               close $store;
            }
            else {
               Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                                  "while attempting tmpget\n", $userinput);
            }
         } else {
            Failure($client, "refused\n", $userinput);
       
         }
   # ---------------------------------------------------------------------- tmpdel
      } elsif ($userinput =~ /^tmpdel/) {
         if(isClient) {
            my ($cmd,$id)=split(/:/,$userinput);
            chomp($id);
            $id=~s/\W/\_/g;
            my $execdir=$perlvar{'lonDaemons'};
            if (unlink("$execdir/tmp/$id.tmp")) {
               Reply($client, "ok\n", $userinput);
            } else {
               Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
                                    "while attempting tmpdel\n", $userinput);
            }
         } else {
            Failure($client, "refused\n", $userinput);
         }
   # -------------------------------------------------------------------------- ls
      } elsif ($userinput =~ /^ls/) {
         if(isClient) {
            my ($cmd,$ulsdir)=split(/:/,$userinput);
            my $ulsout='';
            my $ulsfn;
            if (-e $ulsdir) {
               if(-d $ulsdir) {
                  if (opendir(LSDIR,$ulsdir)) {
                     while ($ulsfn=readdir(LSDIR)) {
                        my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                        $ulsout.=$ulsfn.'&'.
                        join('&',@ulsstats).':';
                     }
                     closedir(LSDIR);
                  }
               } else {
                  my @ulsstats=stat($ulsdir);
                  $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
               }
            } else {
               $ulsout='no_such_dir';
            }
            if ($ulsout eq '') { $ulsout='empty'; }
            Reply($client, "$ulsout\n", $userinput);
         } else {
            Failure($client, "refused\n", $userinput);
       
         }
   # ----------------------------------------------------------------- setannounce
      } elsif ($userinput =~ /^setannounce/) {
         if (isClient) {
            my ($cmd,$announcement)=split(/:/,$userinput);
            chomp($announcement);
            $announcement=&unescape($announcement);
            if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                                                '/announcement.txt')) {
               print $store $announcement;
               close $store;
               Reply($client, "ok\n", $userinput);
            } else {
               Failure($client, "error: ".($!+0)."\n", $userinput);
            }
         } else {
            Failure($client, "refused\n", $userinput);
       
         }
   # ------------------------------------------------------------------ Hanging up
      } elsif (($userinput =~ /^exit/) ||
            ($userinput =~ /^init/)) { # no restrictions.
         &logthis("Client $clientip ($clientname) hanging up: $userinput");
         Reply($client, "bye\n", $userinput);
         $client->shutdown(2);        # shutdown the socket forcibly.
         $client->close();
         $KeepGoing = 0; # Flag to exit the program.
   
   # ---------------------------------- set current host/domain
      } elsif ($userinput =~ /^sethost:/) {
         if (isClient) {
            Reply($client, &sethost($userinput)."\n", $userinput);
         } else {
            Failure($client, "refused\n", $userinput);
         }
   #---------------------------------- request file (?) version.
       } elsif ($userinput =~/^version:/) {
    if (isClient) {
       Reply($client, &version($userinput)."\n", $userinput);
    } else {
       Reply( $client, "refused\n", $userinput);
    }
   # ------------------------------------------------------------- unknown command
   
      } else {
    # unknown command
         Failure($client, "unknown_cmd\n", $userinput);
      }
   
       return $KeepGoing;
   }
   
   
   #
   #   GetCertificate: Given a transaction that requires a certificate,
   #   this function will extract the certificate from the transaction
   #   request.  Note that at this point, the only concept of a certificate
   #   is the hostname to which we are connected.
   #
   #   Parameter:
   #      request   - The request sent by our client (this parameterization may
   #                  need to change when we really use a certificate granting
   #                  authority.
   #
   sub GetCertificate {
       my $request = shift;
   
       return $clientip;
   }
   
   
   
   #
   #   ReadManagerTable: Reads in the current manager table. For now this is
   #                     done on each manager authentication because:
   #                     - These authentications are not frequent
   #                     - This allows dynamic changes to the manager table
   #                       without the need to signal to the lond.
   #
   
   sub ReadManagerTable {
   
       #   Clean out the old table first..
   
      foreach my $key (keys %managers) {
         delete $managers{$key};
      }
   
      my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
      if (!open (MANAGERS, $tablename)) {
         logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
         return;
      }
      while(my $host = <MANAGERS>) {
         chomp($host);
         if ($host =~ "^#") {                  # Comment line.
            logthis('<font color="green"> Skipping line: '. "$host</font>\n");
            next;
         }
         if (!defined $hostip{$host}) { # This is a non cluster member
       #  The entry is of the form:
       #    cluname:hostname
       #  cluname - A 'cluster hostname' is needed in order to negotiate
       #            the host key.
       #  hostname- The dns name of the host.
       #
             my($cluname, $dnsname) = split(/:/, $host);
             
             my $ip = gethostbyname($dnsname);
             if(defined($ip)) {                 # bad names don't deserve entry.
               my $hostip = inet_ntoa($ip);
               $managers{$hostip} = $cluname;
               logthis('<font color="green"> registering manager '.
                       "$dnsname as $cluname with $hostip </font>\n");
            }
         } else {
            logthis('<font color="green"> existing host'." $host</font>\n");
            $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
         }
      }
   }
   
   #
   #  ValidManager: Determines if a given certificate represents a valid manager.
   #                in this primitive implementation, the 'certificate' is
   #                just the connecting loncapa client name.  This is checked
   #                against a valid client list in the configuration.
   #
   #                  
   sub ValidManager {
       my $certificate = shift; 
   
       return isManager;
   }
   #
   #  CopyFile:  Called as part of the process of installing a 
   #             new configuration file.  This function copies an existing
   #             file to a backup file.
   # Parameters:
   #     oldfile  - Name of the file to backup.
   #     newfile  - Name of the backup file.
   # Return:
   #     0   - Failure (errno has failure reason).
   #     1   - Success.
   #
   sub CopyFile {
       my $oldfile = shift;
       my $newfile = shift;
   
       #  The file must exist:
   
       if(-e $oldfile) {
   
    # Read the old file.
   
    my $oldfh = IO::File->new("< $oldfile");
    if(!$oldfh) {
       return 0;
    }
    my @contents = <$oldfh>;  # Suck in the entire file.
   
    # write the backup file:
   
    my $newfh = IO::File->new("> $newfile");
    if(!(defined $newfh)){
       return 0;
    }
    my $lines = scalar @contents;
    for (my $i =0; $i < $lines; $i++) {
       print $newfh ($contents[$i]);
    }
   
    $oldfh->close;
    $newfh->close;
   
    chmod(0660, $newfile);
   
    return 1;
       
       } else {
    return 0;
       }
   }
   #
   #  Host files are passed out with externally visible host IPs.
   #  If, for example, we are behind a fire-wall or NAT host, our 
   #  internally visible IP may be different than the externally
   #  visible IP.  Therefore, we always adjust the contents of the
   #  host file so that the entry for ME is the IP that we believe
   #  we have.  At present, this is defined as the entry that
   #  DNS has for us.  If by some chance we are not able to get a
   #  DNS translation for us, then we assume that the host.tab file
   #  is correct.  
   #    BUGBUGBUG - in the future, we really should see if we can
   #       easily query the interface(s) instead.
   # Parameter(s):
   #     contents    - The contents of the host.tab to check.
   # Returns:
   #     newcontents - The adjusted contents.
   #
   #
   sub AdjustHostContents {
       my $contents  = shift;
       my $adjusted;
       my $me        = $perlvar{'lonHostID'};
   
    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 $ipnew = inet_ntoa($ip);
            $ip = $ipnew;
    #  Reconstruct the host line and append to adjusted:
   
      my $newline = "$id:$domain:$role:$name:$ip";
      if($maxcon ne "") { # Not all hosts have loncnew tuning params
        $newline .= ":$maxcon:$idleto:$mincon";
      }
      $adjusted .= $newline."\n";
   
         } else { # Not me, pass unmodified.
      $adjusted .= $line."\n";
         }
    } else {                  # Blank or comment never re-written.
       $adjusted .= $line."\n"; # Pass blanks and comments as is.
    }
    }
    return $adjusted;
   }
   #
   #   InstallFile: Called to install an administrative file:
   #       - The file is created with <name>.tmp
   #       - The <name>.tmp file is then mv'd to <name>
   #   This lugubrious procedure is done to ensure that we are never without
   #   a valid, even if dated, version of the file regardless of who crashes
   #   and when the crash occurs.
   #
   #  Parameters:
   #       Name of the file
   #       File Contents.
   #  Return:
   #      nonzero - success.
   #      0       - failure and $! has an errno.
   #
   sub InstallFile {
       my $Filename = shift;
       my $Contents = shift;
       my $TempFile = $Filename.".tmp";
   
       #  Open the file for write:
   
       my $fh = IO::File->new("> $TempFile"); # Write to temp.
       if(!(defined $fh)) {
    &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
    return 0;
       }
       #  write the contents of the file:
   
       print $fh ($Contents); 
       $fh->close; # In case we ever have a filesystem w. locking
   
       chmod(0660, $TempFile);
   
       # Now we can move install the file in position.
       
       move($TempFile, $Filename);
   
       return 1;
   }
   #
   #   ConfigFileFromSelector: converts a configuration file selector
   #                 (one of host or domain at this point) into a 
   #                 configuration file pathname.
   #
   #  Parameters:
   #      selector  - Configuration file selector.
   #  Returns:
   #      Full path to the file or undef if the selector is invalid.
   #
   sub ConfigFileFromSelector {
       my $selector   = shift;
       my $tablefile;
   
       my $tabledir = $perlvar{'lonTabDir'}.'/';
       if ($selector eq "hosts") {
    $tablefile = $tabledir."hosts.tab";
       } elsif ($selector eq "domain") {
    $tablefile = $tabledir."domain.tab";
       } else {
    return undef;
       }
       return $tablefile;
   
   }
   #
   #   PushFile:  Called to do an administrative push of a file.
   #              - Ensure the file being pushed is one we support.
   #              - Backup the old file to <filename.saved>
   #              - Separate the contents of the new file out from the
   #                rest of the request.
   #              - Write the new file.
   #  Parameter:
   #     Request - The entire user request.  This consists of a : separated
   #               string pushfile:tablename:contents.
   #     NOTE:  The contents may have :'s in it as well making things a bit
   #            more interesting... but not much.
   #  Returns:
   #     String to send to client ("ok" or "refused" if bad file).
   #
   sub PushFile {
       my $request = shift;    
       my ($command, $filename, $contents) = split(":", $request, 3);
       
       #  At this point in time, pushes for only the following tables are
       #  supported:
       #   hosts.tab  ($filename eq host).
       #   domain.tab ($filename eq domain).
       # Construct the destination filename or reject the request.
       #
       # lonManage is supposed to ensure this, however this session could be
       # part of some elaborate spoof that managed somehow to authenticate.
       #
   
   
       my $tablefile = ConfigFileFromSelector($filename);
       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 
       #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
       #  that possibilty.
   
       if($filename eq "host") {
    $contents = AdjustHostContents($contents);
       }
   
       #  Install the new file:
   
       if(!InstallFile($tablefile, $contents)) {
    &logthis('<font color="red"> Pushfile: unable to install '
    .$tablefile." $! </font>");
    return "error:$!";
       }
       else {
    &logthis('<font color="green"> Installed new '.$tablefile
    ."</font>");
   
       }
   
   
       #  Indicate success:
    
       return "ok";
   
   }
   
   #
   #  Called to re-init either lonc or lond.
   #
   #  Parameters:
   #    request   - The full request by the client.  This is of the form
   #                reinit:<process>  
   #                where <process> is allowed to be either of 
   #                lonc or lond
   #
   #  Returns:
   #     The string to be sent back to the client either:
   #   ok         - Everything worked just fine.
   #   error:why  - There was a failure and why describes the reason.
   #
   #
   sub ReinitProcess {
       my $request = shift;
   
   
       # separate the request (reinit) from the process identifier and
       # validate it producing the name of the .pid file for the process.
       #
       #
       my ($junk, $process) = split(":", $request);
       my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
       if($process eq 'lonc') {
    $processpidfile = $processpidfile."lonc.pid";
    if (!open(PIDFILE, "< $processpidfile")) {
       return "error:Open failed for $processpidfile";
    }
    my $loncpid = <PIDFILE>;
    close(PIDFILE);
    logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
    ."</font>");
    kill("USR2", $loncpid);
       } elsif ($process eq 'lond') {
    logthis('<font color="red"> Reinitializing self (lond) </font>');
    &UpdateHosts; # Lond is us!!
       } else {
    &logthis('<font color="yellow" Invalid reinit request for '.$process
    ."</font>");
    return "error:Invalid process identifier $process";
       }
       return 'ok';
   }
   #   Validate a line in a configuration file edit script:
   #   Validation includes:
   #     - Ensuring the command is valid.
   #     - Ensuring the command has sufficient parameters
   #   Parameters:
   #     scriptline - A line to validate (\n has been stripped for what it's worth).
   #
   #   Return:
   #      0     - Invalid scriptline.
   #      1     - Valid scriptline
   #  NOTE:
   #     Only the command syntax is checked, not the executability of the
   #     command.
   #
   sub isValidEditCommand {
       my $scriptline = shift;
   
       #   Line elements are pipe separated:
   
       my ($command, $key, $newline)  = split(/\|/, $scriptline);
       &logthis('<font color="green"> isValideditCommand checking: '.
        "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
       
       if ($command eq "delete") {
    #
    #   key with no newline.
    #
    if( ($key eq "") || ($newline ne "")) {
       return 0; # Must have key but no newline.
    } else {
       return 1; # Valid syntax.
    }
       } elsif ($command eq "replace") {
    #
    #   key and newline:
    #
    if (($key eq "") || ($newline eq "")) {
       return 0;
    } else {
       return 1;
    }
       } elsif ($command eq "append") {
    if (($key ne "") && ($newline eq "")) {
       return 1;
    } else {
       return 0;
    }
       } else {
    return 0; # Invalid command.
       }
       return 0; # Should not get here!!!
   }
   #
   #   ApplyEdit - Applies an edit command to a line in a configuration 
   #               file.  It is the caller's responsiblity to validate the
   #               edit line.
   #   Parameters:
   #      $directive - A single edit directive to apply.  
   #                   Edit directives are of the form:
   #                  append|newline      - Appends a new line to the file.
   #                  replace|key|newline - Replaces the line with key value 'key'
   #                  delete|key          - Deletes the line with key value 'key'.
   #      $editor   - A config file editor object that contains the
   #                  file being edited.
   #
   sub ApplyEdit {
       my $directive   = shift;
       my $editor      = shift;
   
       # Break the directive down into its command and its parameters
       # (at most two at this point.  The meaning of the parameters, if in fact
       #  they exist depends on the command).
   
       my ($command, $p1, $p2) = split(/\|/, $directive);
   
       if($command eq "append") {
    $editor->Append($p1);          # p1 - key p2 null.
       } elsif ($command eq "replace") {
    $editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
       } elsif ($command eq "delete") {
    $editor->DeleteLine($p1);         # p1 - key p2 null.
       } else {          # Should not get here!!!
    die "Invalid command given to ApplyEdit $command"
       }
   }
   #
   # AdjustOurHost:
   #           Adjusts a host file stored in a configuration file editor object
   #           for the true IP address of this host. This is necessary for hosts
   #           that live behind a firewall.
   #           Those hosts have a publicly distributed IP of the firewall, but
   #           internally must use their actual IP.  We assume that a given
   #           host only has a single IP interface for now.
   # Formal Parameters:
   #     editor   - The configuration file editor to adjust.  This
   #                editor is assumed to contain a hosts.tab file.
   # Strategy:
   #    - Figure out our hostname.
   #    - Lookup the entry for this host.
   #    - Modify the line to contain our IP
   #    - Do a replace for this host.
   sub AdjustOurHost {
       my $editor        = shift;
   
       # figure out who I am.
   
       my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
   
       #  Get my host file entry.
   
       my $ConfigLine    = $editor->Find($myHostName);
       if(! (defined $ConfigLine)) {
    die "AdjustOurHost - no entry for me in hosts file $myHostName";
       }
       # figure out my IP:
       #   Use the config line to get my hostname.
       #   Use gethostbyname to translate that into an IP address.
       #
       my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
       my $BinaryIp = gethostbyname($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) {
    $newConfigLine .= ":".$item;
       }
       #  Replace the line:
   
       $editor->ReplaceLine($id, $newConfigLine);
       
   }
   #
   #   ReplaceConfigFile:
   #              Replaces a configuration file with the contents of a
   #              configuration file editor object.
   #              This is done by:
   #              - Copying the target file to <filename>.old
   #              - Writing the new file to <filename>.tmp
   #              - Moving <filename.tmp>  -> <filename>
   #              This laborious process ensures that the system is never without
   #              a configuration file that's at least valid (even if the contents
   #              may be dated).
   #   Parameters:
   #        filename   - Name of the file to modify... this is a full path.
   #        editor     - Editor containing the file.
   #
   sub ReplaceConfigFile {
       my $filename  = shift;
       my $editor    = shift;
   
       CopyFile ($filename, $filename.".old");
   
       my $contents  = $editor->Get(); # Get the contents of the file.
   
       InstallFile($filename, $contents);
   }
   #   
   #
   #   Called to edit a configuration table  file
   #   Parameters:
   #      request           - The entire command/request sent by lonc or lonManage
   #   Return:
   #      The reply to send to the client.
   #
   sub EditFile {
       my $request = shift;
   
       #  Split the command into it's pieces:  edit:filetype:script
   
       my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
   
       #  Check the pre-coditions for success:
   
       if($request != "edit") { # Something is amiss afoot alack.
    return "error:edit request detected, but request != 'edit'\n";
       }
       if( ($filetype ne "hosts")  &&
    ($filetype ne "domain")) {
    return "error:edit requested with invalid file specifier: $filetype \n";
       }
   
       #   Split the edit script and check it's validity.
   
       my @scriptlines = split(/\n/, $script);  # one line per element.
       my $linecount   = scalar(@scriptlines);
       for(my $i = 0; $i < $linecount; $i++) {
    chomp($scriptlines[$i]);
    if(!isValidEditCommand($scriptlines[$i])) {
       return "error:edit with bad script line: '$scriptlines[$i]' \n";
    }
       }
   
       #   Execute the edit operation.
       #   - Create a config file editor for the appropriate file and 
       #   - execute each command in the script:
       #
       my $configfile = ConfigFileFromSelector($filetype);
       if (!(defined $configfile)) {
    return "refused\n";
       }
       my $editor = ConfigFileEdit->new($configfile);
   
       for (my $i = 0; $i < $linecount; $i++) {
    ApplyEdit($scriptlines[$i], $editor);
       }
       # If the file is the host file, ensure that our host is
       # adjusted to have our ip:
       #
       if($filetype eq "host") {
    AdjustOurHost($editor);
       }
       #  Finally replace the current file with our file.
       #
       ReplaceConfigFile($configfile, $editor);
   
       return "ok\n";
   }
 #  #
 #  Convert an error return code from lcpasswd to a string value.  #  Convert an error return code from lcpasswd to a string value.
 #  #
Line 154  sub catchexception { Line 3263  sub catchexception {
     my ($error)=@_;      my ($error)=@_;
     $SIG{'QUIT'}='DEFAULT';      $SIG{'QUIT'}='DEFAULT';
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
       &status("Catching exception");
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color=red>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "       ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
      ."a crash with this error msg->[$error]</font>");       ."a crash with this error msg->[$error]</font>");
Line 164  sub catchexception { Line 3274  sub catchexception {
 }  }
   
 sub timeout {  sub timeout {
       &status("Handling Timeout");
     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");      &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
     &catchexception('Timeout');      &catchexception('Timeout');
 }  }
Line 175  $SIG{__DIE__}=\&catchexception; Line 3286  $SIG{__DIE__}=\&catchexception;
 # ---------------------------------- Read loncapa_apache.conf and loncapa.conf  # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
 &status("Read loncapa.conf and loncapa_apache.conf");  &status("Read loncapa.conf and loncapa_apache.conf");
 my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');  my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
 my %perlvar=%{$perlvarref};  %perlvar=%{$perlvarref};
 undef $perlvarref;  undef $perlvarref;
   
 # ----------------------------- Make sure this process is running from user=www  # ----------------------------- Make sure this process is running from user=www
Line 201  if (-e $pidfile) { Line 3312  if (-e $pidfile) {
   
 # ------------------------------------------------------------- Read hosts file  # ------------------------------------------------------------- Read hosts file
   
 open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";  
   
 while (my $configline=<CONFIG>) {  
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);  
     chomp($ip); $ip=~s/\D+$//;  
     $hostid{$ip}=$id;  
     $hostdom{$id}=$domain;  
     $hostip{$id}=$ip;  
     if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }  
 }  
 close(CONFIG);  
   
 # establish SERVER socket, bind and listen.  # establish SERVER socket, bind and listen.
 $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},  $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
Line 230  my $children               = 0;        # Line 3331  my $children               = 0;        #
   
 sub REAPER {                        # takes care of dead children  sub REAPER {                        # takes care of dead children
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
       &status("Handling child death");
     my $pid = wait;      my $pid = wait;
     if (defined($children{$pid})) {      if (defined($children{$pid})) {
  &logthis("Child $pid died");   &logthis("Child $pid died");
Line 238  sub REAPER {                        # ta Line 3340  sub REAPER {                        # ta
     } else {      } else {
  &logthis("Unknown Child $pid died");   &logthis("Unknown Child $pid died");
     }      }
       &status("Finished Handling child death");
 }  }
   
 sub HUNTSMAN {                      # signal handler for SIGINT  sub HUNTSMAN {                      # signal handler for SIGINT
       &status("Killing children (INT)");
     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children      local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
     kill 'INT' => keys %children;      kill 'INT' => keys %children;
     &logthis("Free socket: ".shutdown($server,2)); # free up socket      &logthis("Free socket: ".shutdown($server,2)); # free up socket
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unlink("$execdir/logs/lond.pid");      unlink("$execdir/logs/lond.pid");
     &logthis("<font color=red>CRITICAL: Shutting down</font>");      &logthis("<font color=red>CRITICAL: Shutting down</font>");
       &status("Done killing children");
     exit;                           # clean up with dignity      exit;                           # clean up with dignity
 }  }
   
 sub HUPSMAN {                      # signal handler for SIGHUP  sub HUPSMAN {                      # signal handler for SIGHUP
     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children      local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
       &status("Killing children for restart (HUP)");
     kill 'INT' => keys %children;      kill 'INT' => keys %children;
     &logthis("Free socket: ".shutdown($server,2)); # free up socket      &logthis("Free socket: ".shutdown($server,2)); # free up socket
     &logthis("<font color=red>CRITICAL: Restarting</font>");      &logthis("<font color=red>CRITICAL: Restarting</font>");
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unlink("$execdir/logs/lond.pid");      unlink("$execdir/logs/lond.pid");
       &status("Restarting self (HUP)");
     exec("$execdir/lond");         # here we go again      exec("$execdir/lond");         # here we go again
 }  }
   
   #
   #    Kill off hashes that describe the host table prior to re-reading it.
   #    Hashes affected are:
   #       %hostid, %hostdom %hostip
   #
   sub KillHostHashes {
       foreach my $key (keys %hostid) {
    delete $hostid{$key};
       }
       foreach my $key (keys %hostdom) {
    delete $hostdom{$key};
       }
       foreach my $key (keys %hostip) {
    delete $hostip{$key};
       }
   }
   #
   #   Read in the host table from file and distribute it into the various hashes:
   #
   #    - %hostid  -  Indexed by IP, the loncapa hostname.
   #    - %hostdom -  Indexed by  loncapa hostname, the domain.
   #    - %hostip  -  Indexed by hostid, the Ip address of the host.
   sub ReadHostTable {
   
       open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
       
       while (my $configline=<CONFIG>) {
    my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
    chomp($ip); $ip=~s/\D+$//;
    $hostid{$ip}=$id;
    $hostdom{$id}=$domain;
    $hostip{$id}=$ip;
    if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
       }
       close(CONFIG);
   }
   #
   #  Reload the Apache daemon's state.
   #  This is done by invoking /home/httpd/perl/apachereload
   #  a setuid perl script that can be root for us to do this job.
   #
   sub ReloadApache {
       my $execdir = $perlvar{'lonDaemons'};
       my $script  = $execdir."/apachereload";
       system($script);
   }
   
   #
   #   Called in response to a USR2 signal.
   #   - Reread hosts.tab
   #   - All children connected to hosts that were removed from hosts.tab
   #     are killed via SIGINT
   #   - All children connected to previously existing hosts are sent SIGUSR1
   #   - Our internal hosts hash is updated to reflect the new contents of
   #     hosts.tab causing connections from hosts added to hosts.tab to
   #     now be honored.
   #
   sub UpdateHosts {
       &status("Reload hosts.tab");
       logthis('<font color="blue"> Updating connections </font>');
       #
       #  The %children hash has the set of IP's we currently have children
       #  on.  These need to be matched against records in the hosts.tab
       #  Any ip's no longer in the table get killed off they correspond to
       #  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.
   
   
       KillHostHashes;
       ReadHostTable;
   
       foreach my $child (keys %children) {
    my $childip = $children{$child};
    if(!$hostid{$childip}) {
       logthis('<font color="blue"> UpdateHosts killing child '
       ." $child for ip $childip </font>");
       kill('INT', $child);
    } else {
       logthis('<font color="green"> keeping child for ip '
       ." $childip (pid=$child) </font>");
    }
       }
       ReloadApache;
       &status("Finished reloading hosts.tab");
   }
   
   
 sub checkchildren {  sub checkchildren {
       &status("Checking on the children (sending signals)");
     &initnewstatus();      &initnewstatus();
     &logstatus();      &logstatus();
     &logthis('Going to check on the children');      &logthis('Going to check on the children');
Line 275  sub checkchildren { Line 3470  sub checkchildren {
     sleep 5;      sleep 5;
     $SIG{ALRM} = sub { die "timeout" };      $SIG{ALRM} = sub { die "timeout" };
     $SIG{__DIE__} = 'DEFAULT';      $SIG{__DIE__} = 'DEFAULT';
       &status("Checking on the children (waiting for reports)");
     foreach (sort keys %children) {      foreach (sort keys %children) {
         unless (-e "$docdir/lon-status/londchld/$_.txt") {          unless (-e "$docdir/lon-status/londchld/$_.txt") {
           eval {            eval {
Line 291  sub checkchildren { Line 3487  sub checkchildren {
         }          }
     }      }
     $SIG{ALRM} = 'DEFAULT';      $SIG{ALRM} = 'DEFAULT';
     $SIG{__DIE__} = \&cathcexception;      $SIG{__DIE__} = \&catchexception;
       &status("Finished checking children");
 }  }
   
 # --------------------------------------------------------------------- Logging  # --------------------------------------------------------------------- Logging
Line 313  sub Debug { Line 3510  sub Debug {
  &logthis($message);   &logthis($message);
     }      }
 }  }
   
   #
   #   Sub to do replies to client.. this gives a hook for some
   #   debug tracing too:
   #  Parameters:
   #     fd      - File open on client.
   #     reply   - Text to send to client.
   #     request - Original request from client.
   #
   #  Note: This increments Transactions
   #
   sub Reply {
       alarm(120);
       my $fd      = shift;
       my $reply   = shift;
       my $request = shift;
   
       print $fd $reply;
       Debug("Request was $request  Reply was $reply");
   
       $Transactions++;
       alarm(0);
   
   
   }
   #
   #    Sub to report a failure.
   #    This function:
   #     -   Increments the failure statistic counters.
   #     -   Invokes Reply to send the error message to the client.
   # Parameters:
   #    fd       - File descriptor open on the client
   #    reply    - Reply text to emit.
   #    request  - The original request message (used by Reply
   #               to debug if that's enabled.
   # Implicit outputs:
   #    $Failures- The number of failures is incremented.
   #    Reply (invoked here) sends a message to the 
   #    client:
   #
   sub Failure {
      my $fd      = shift;
      my $reply   = shift;
      my $request = shift;
      
      $Failures++;
      Reply($fd, $reply, $request);      # That's simple eh?
   }
 # ------------------------------------------------------------------ Log status  # ------------------------------------------------------------------ Log status
   
 sub logstatus {  sub logstatus {
     my $docdir=$perlvar{'lonDocRoot'};     &status("Doing logging");
     {     my $docdir=$perlvar{'lonDocRoot'};
     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");     {
     print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";        my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
     $fh->close();        print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
     }        $fh->close();
     {     }
  my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");     &status("Finished londstatus.txt");
         print $fh $status."\n".$lastlog."\n".time;     {
         $fh->close();        my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
     }        print $fh $status."\n".$lastlog."\n".time;
         $fh->close();
      }
      ResetStatistics;
      &status("Finished logging");
      
 }  }
   
 sub initnewstatus {  sub initnewstatus {
Line 348  sub status { Line 3598  sub status {
     my $what=shift;      my $what=shift;
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     $status=$local.': '.$what;      my $status = "lond: $what $local ";
     $0='lond: '.$what.' '.$local;      if($Transactions) {
          $status .= " Transactions: $Transactions Failed; $Failures";
       }
       $0=$status;
 }  }
   
 # -------------------------------------------------------- Escape Special Chars  # -------------------------------------------------------- Escape Special Chars
Line 502  $SIG{CHLD} = \&REAPER; Line 3755  $SIG{CHLD} = \&REAPER;
 $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
 $SIG{HUP}  = \&HUPSMAN;  $SIG{HUP}  = \&HUPSMAN;
 $SIG{USR1} = \&checkchildren;  $SIG{USR1} = \&checkchildren;
   $SIG{USR2} = \&UpdateHosts;
   
   #  Read the host hashes:
   
   ReadHostTable;
   
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
Line 511  $SIG{USR1} = \&checkchildren; Line 3768  $SIG{USR1} = \&checkchildren;
 #   along the connection.  #   along the connection.
   
 while (1) {  while (1) {
       &status('Starting accept');
     $client = $server->accept() or next;      $client = $server->accept() or next;
       &status('Accepted '.$client.' off to spawn');
     make_new_child($client);      make_new_child($client);
       &status('Finished spawning');
 }  }
   
 sub make_new_child {  sub make_new_child {
     my $pid;      my $pid;
     my $cipher;  
     my $sigset;      my $sigset;
   
     $client = shift;      $client = shift;
     &logthis("Attempting to start child");          &status('Starting new child '.$client);
       &logthis('<font color="green"> Attempting to start child ('.$client.
        ")</font>");    
     # block signal for fork      # block signal for fork
     $sigset = POSIX::SigSet->new(SIGINT);      $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset)      sigprocmask(SIG_BLOCK, $sigset)
         or die "Can't block SIGINT for fork: $!\n";          or die "Can't block SIGINT for fork: $!\n";
   
     my $clientip;  
     die "fork: $!" unless defined ($pid = fork);      die "fork: $!" unless defined ($pid = fork);
   
       $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                                  # connection liveness.
   
       #
       #  Figure out who we're talking to so we can record the peer in 
       #  the pid hash.
       #
       my $caller = getpeername($client);
       my ($port,$iaddr)=unpack_sockaddr_in($caller);
       $clientip=inet_ntoa($iaddr);
           
     if ($pid) {      if ($pid) {
         # Parent records the child's birth and returns.          # Parent records the child's birth and returns.
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
         $children{$pid} = 1;          $children{$pid} = $clientip;
         $children++;          $children++;
         &status('Started child '.$pid);          &status('Started child '.$pid);
         return;          return;
Line 552  sub make_new_child { Line 3823  sub make_new_child {
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
   
         my $tmpsnum=0;  
 #---------------------------------------------------- kerberos 5 initialization  
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
         &Authen::Krb5::init_ets();          &Authen::Krb5::init_ets();
   
             &status('Accepted connection');   &status('Accepted connection');
 # =============================================================================  # =============================================================================
             # do something with the connection              # do something with the connection
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
     $client->sockopt(SO_KEEPALIVE, 1);# Enable monitoring of   # see if we know client and check for spoof IP by challenge
                                       # connection liveness.  
             # see if we know client and check for spoof IP by challenge  
  my $caller = getpeername($client);  
             my ($port,$iaddr)=unpack_sockaddr_in($caller);  
             $clientip=inet_ntoa($iaddr);  
             my $clientrec=($hostid{$clientip} ne undef);  
             &logthis(  
 "<font color=yellow>INFO: Connection, $clientip ($hostid{$clientip})</font>"  
             );  
             &status("Connecting $clientip ($hostid{$clientip})");   
             my $clientok;  
             if ($clientrec) {  
       &status("Waiting for init from $clientip ($hostid{$clientip})");  
       my $remotereq=<$client>;  
               $remotereq=~s/[^\w:]//g;  
               if ($remotereq =~ /^init/) {  
   &sethost("sethost:$perlvar{'lonHostID'}");  
   my $challenge="$$".time;  
                   print $client "$challenge\n";  
                   &status(  
            "Waiting for challenge reply from $clientip ($hostid{$clientip})");   
                   $remotereq=<$client>;  
                   $remotereq=~s/\W//g;  
                   if ($challenge eq $remotereq) {  
       $clientok=1;  
                       print $client "ok\n";  
                   } else {  
       &logthis(  
  "<font color=blue>WARNING: $clientip did not reply challenge</font>");  
                       &status('No challenge reply '.$clientip);  
                   }  
               } else {  
   &logthis(  
                     "<font color=blue>WARNING: "  
                    ."$clientip failed to initialize: >$remotereq< </font>");  
                   &status('No init '.$clientip);  
               }  
     } else {  
               &logthis(  
  "<font color=blue>WARNING: Unknown client $clientip</font>");  
               &status('Hung up on '.$clientip);  
             }  
             if ($clientok) {  
 # ---------------- New known client connecting, could mean machine online again  
   
  foreach my $id (keys(%hostip)) {   ReadManagerTable; # May also be a manager!!
     if ($hostip{$id} ne $clientip ||  
        $hostip{$currenthostid} eq $clientip) {   my $clientrec=($hostid{$clientip}     ne undef);
  # no need to try to do recon's to myself   my $ismanager=($managers{$clientip}    ne undef);
  next;   $clientname  = "[unknonwn]";
     }   if($clientrec) { # Establish client type.
     &reconlonc("$perlvar{'lonSockDir'}/$id");      $ConnectionType = "client";
       $clientname = $hostid{$clientip};
       if($ismanager) {
    $ConnectionType = "both";
       }
    } else {
       $ConnectionType = "manager";
       $clientname = $managers{$clientip};
    }
    my $clientok;
    if ($clientrec || $ismanager) {
       &status("Waiting for init from $clientip $clientname");
       &logthis('<font color="yellow">INFO: Connection, '.
        $clientip.
     " ($clientname) connection type = $ConnectionType </font>" );
       &status("Connecting $clientip  ($clientname))"); 
       my $remotereq=<$client>;
       $remotereq=~s/[^\w:]//g;
       if ($remotereq =~ /^init/) {
    &sethost("sethost:$perlvar{'lonHostID'}");
    my $challenge="$$".time;
    print $client "$challenge\n";
    &status(
    "Waiting for challenge reply from $clientip ($clientname)"); 
    $remotereq=<$client>;
    $remotereq=~s/\W//g;
    if ($challenge eq $remotereq) {
       $clientok=1;
       print $client "ok\n";
    } else {
       &logthis(
        "<font color=blue>WARNING: $clientip did not reply challenge</font>");
       &status('No challenge reply '.$clientip);
  }   }
  &logthis("<font color=green>Established connection: $hostid{$clientip}</font>");      } else {
               &status('Will listen to '.$hostid{$clientip});   &logthis(
 # ------------------------------------------------------------ Process requests   "<font color=blue>WARNING: "
               while (my $userinput=<$client>) {   ."$clientip failed to initialize: >$remotereq< </font>");
                 chomp($userinput);   &status('No init '.$clientip);
  Debug("Request = $userinput\n");      }
                 &status('Processing '.$hostid{$clientip}.': '.$userinput);   } else {
                 my $wasenc=0;      &logthis(
                 alarm(120);       "<font color=blue>WARNING: Unknown client $clientip</font>");
 # ------------------------------------------------------------ See if encrypted      &status('Hung up on '.$clientip);
  if ($userinput =~ /^enc/) {   }
   if ($cipher) {   if ($clientok) {
                     my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);  # ---------------- New known client connecting, could mean machine online again
     $userinput='';      
                     for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {      foreach my $id (keys(%hostip)) {
                        $userinput.=   if ($hostip{$id} ne $clientip ||
    $cipher->decrypt(      $hostip{$currenthostid} eq $clientip) {
                             pack("H16",substr($encinput,$encidx,16))      # no need to try to do recon's to myself
                            );      next;
     }  
     $userinput=substr($userinput,0,$cmdlength);  
                     $wasenc=1;  
  }   }
       }   &reconlonc("$perlvar{'lonSockDir'}/$id");
         }
 # ------------------------------------------------------------- Normal commands      &logthis("<font color=green>Established connection: $clientname</font>");
 # ------------------------------------------------------------------------ ping      &status('Will listen to '.$clientname);
    if ($userinput =~ /^ping/) {  
                        print $client "$currenthostid\n";  
 # ------------------------------------------------------------------------ pong  
    } elsif ($userinput =~ /^pong/) {  
                        my $reply=&reply("ping",$hostid{$clientip});  
                        print $client "$currenthostid:$reply\n";   
 # ------------------------------------------------------------------------ ekey  
    } elsif ($userinput =~ /^ekey/) {  
                        my $buildkey=time.$$.int(rand 100000);  
                        $buildkey=~tr/1-6/A-F/;  
                        $buildkey=int(rand 100000).$buildkey.int(rand 100000);  
                        my $key=$currenthostid.$hostid{$clientip};  
                        $key=~tr/a-z/A-Z/;  
                        $key=~tr/G-P/0-9/;  
                        $key=~tr/Q-Z/0-9/;  
                        $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;  
                        $key=substr($key,0,32);  
                        my $cipherkey=pack("H32",$key);  
                        $cipher=new IDEA $cipherkey;  
                        print $client "$buildkey\n";   
 # ------------------------------------------------------------------------ load  
    } elsif ($userinput =~ /^load/) {  
                        my $loadavg;  
                        {  
                           my $loadfile=IO::File->new('/proc/loadavg');  
                           $loadavg=<$loadfile>;  
                        }  
                        $loadavg =~ s/\s.*//g;  
        my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};  
        print $client "$loadpercent\n";  
 # -------------------------------------------------------------------- userload  
    } elsif ($userinput =~ /^userload/) {  
        my $userloadpercent=&userload();  
        print $client "$userloadpercent\n";  
 # ----------------------------------------------------------------- currentauth  
    } elsif ($userinput =~ /^currentauth/) {  
      if ($wasenc==1) {  
                        my ($cmd,$udom,$uname)=split(/:/,$userinput);  
        my $result = GetAuthType($udom, $uname);  
        if($result eq "nouser") {  
    print $client "unknown_user\n";  
        }  
        else {  
    print $client "$result\n"  
        }  
      } else {  
        print $client "refused\n";  
      }  
 # ------------------------------------------------------------------------ auth  
                    } elsif ($userinput =~ /^auth/) {  
      if ($wasenc==1) {  
                        my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);  
                        chomp($upass);  
                        $upass=unescape($upass);  
                        my $proname=propath($udom,$uname);  
                        my $passfilename="$proname/passwd";  
                        if (-e $passfilename) {  
                           my $pf = IO::File->new($passfilename);  
                           my $realpasswd=<$pf>;  
                           chomp($realpasswd);  
                           my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
                           my $pwdcorrect=0;  
                           if ($howpwd eq 'internal') {  
       &Debug("Internal auth");  
       $pwdcorrect=  
   (crypt($upass,$contentpwd) eq $contentpwd);  
                           } elsif ($howpwd eq 'unix') {  
       &Debug("Unix auth");  
                               if((getpwnam($uname))[1] eq "") { #no such user!  
   $pwdcorrect = 0;  
       } else {  
   $contentpwd=(getpwnam($uname))[1];  
   my $pwauth_path="/usr/local/sbin/pwauth";  
   unless ($contentpwd eq 'x') {  
       $pwdcorrect=  
   (crypt($upass,$contentpwd) eq   
    $contentpwd);  
   }  
     
       elsif (-e $pwauth_path) {  
   open PWAUTH, "|$pwauth_path" or  
       die "Cannot invoke authentication";  
   print PWAUTH "$uname\n$upass\n";  
   close PWAUTH;  
   $pwdcorrect=!$?;  
       }  
       }  
                           } elsif ($howpwd eq 'krb4') {  
                               my $null=pack("C",0);  
                               unless ($upass=~/$null/) {  
                                   my $krb4_error = &Authen::Krb4::get_pw_in_tkt  
                                       ($uname,"",$contentpwd,'krbtgt',  
                                        $contentpwd,1,$upass);  
                                   if (!$krb4_error) {  
                                       $pwdcorrect = 1;  
                                   } else {   
                                       $pwdcorrect=0;   
                                       # log error if it is not a bad password  
                                       if ($krb4_error != 62) {  
        &logthis('krb4:'.$uname.','.$contentpwd.','.  
                 &Authen::Krb4::get_err_txt($Authen::Krb4::error));  
                                       }  
                                   }  
                               }  
                           } elsif ($howpwd eq 'krb5') {  
       my $null=pack("C",0);  
       unless ($upass=~/$null/) {  
   my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);  
   my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;  
   my $krbserver=&Authen::Krb5::parse_name($krbservice);  
   my $credentials=&Authen::Krb5::cc_default();  
   $credentials->initialize($krbclient);  
   my $krbreturn =   
     &Authen::Krb5::get_in_tkt_with_password(  
      $krbclient,$krbserver,$upass,$credentials);  
 #  unless ($krbreturn) {  
 #      &logthis("Krb5 Error: ".  
 #       &Authen::Krb5::error());  
 #  }  
   $pwdcorrect = ($krbreturn == 1);  
    } else { $pwdcorrect=0; }  
                           } elsif ($howpwd eq 'localauth') {  
     $pwdcorrect=&localauth::localauth($uname,$upass,  
       $contentpwd);  
   }  
                           if ($pwdcorrect) {  
                              print $client "authorized\n";  
                           } else {  
                              print $client "non_authorized\n";  
                           }    
        } else {  
                           print $client "unknown_user\n";  
                        }  
      } else {  
        print $client "refused\n";  
      }  
 # ---------------------------------------------------------------------- passwd  
                    } elsif ($userinput =~ /^passwd/) {  
      if ($wasenc==1) {  
                        my   
                        ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);  
                        chomp($npass);  
                        $upass=&unescape($upass);  
                        $npass=&unescape($npass);  
        &Debug("Trying to change password for $uname");  
        my $proname=propath($udom,$uname);  
                        my $passfilename="$proname/passwd";  
                        if (-e $passfilename) {  
    my $realpasswd;  
                           { my $pf = IO::File->new($passfilename);  
     $realpasswd=<$pf>; }  
                           chomp($realpasswd);  
                           my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
                           if ($howpwd eq 'internal') {  
    &Debug("internal auth");  
    if (crypt($upass,$contentpwd) eq $contentpwd) {  
      my $salt=time;  
                              $salt=substr($salt,6,2);  
      my $ncpass=crypt($npass,$salt);  
                              { my $pf = IO::File->new(">$passfilename");  
           print $pf "internal:$ncpass\n"; }               
      &logthis("Result of password change for $uname: pwchange_success");  
                              print $client "ok\n";  
                            } else {  
                              print $client "non_authorized\n";  
                            }  
                           } elsif ($howpwd eq 'unix') {  
       # Unix means we have to access /etc/password  
       # one way or another.  
       # First: Make sure the current password is  
       #        correct  
       &Debug("auth is unix");  
       $contentpwd=(getpwnam($uname))[1];  
       my $pwdcorrect = "0";  
       my $pwauth_path="/usr/local/sbin/pwauth";  
       unless ($contentpwd eq 'x') {  
   $pwdcorrect=  
                                     (crypt($upass,$contentpwd) eq $contentpwd);  
       } elsif (-e $pwauth_path) {  
   open PWAUTH, "|$pwauth_path" or  
       die "Cannot invoke authentication";  
   print PWAUTH "$uname\n$upass\n";  
   close PWAUTH;  
   &Debug("exited pwauth with $? ($uname,$upass) ");  
   $pwdcorrect=($? == 0);  
       }  
      if ($pwdcorrect) {  
  my $execdir=$perlvar{'lonDaemons'};  
  &Debug("Opening lcpasswd pipeline");  
  my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");  
  print $pf "$uname\n$npass\n$npass\n";  
  close $pf;  
  my $err = $?;  
  my $result = ($err>0 ? 'pwchange_failure'   
        : 'ok');  
  &logthis("Result of password change for $uname: ".  
   &lcpasswdstrerror($?));  
  print $client "$result\n";  
      } else {  
  print $client "non_authorized\n";  
      }  
   } else {  
                             print $client "auth_mode_error\n";  
                           }    
        } else {  
                           print $client "unknown_user\n";  
                        }  
      } else {  
        print $client "refused\n";  
      }  
 # -------------------------------------------------------------------- makeuser  
                    } elsif ($userinput =~ /^makeuser/) {  
      &Debug("Make user received");  
                 my $oldumask=umask(0077);  
      if ($wasenc==1) {  
                        my   
                        ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);  
        &Debug("cmd =".$cmd." $udom =".$udom.  
     " uname=".$uname);  
                        chomp($npass);  
                        $npass=&unescape($npass);  
                        my $proname=propath($udom,$uname);  
                        my $passfilename="$proname/passwd";  
        &Debug("Password file created will be:".  
     $passfilename);  
                        if (-e $passfilename) {  
    print $client "already_exists\n";  
                        } elsif ($udom ne $currentdomainid) {  
                            print $client "not_right_domain\n";  
                        } else {  
                            my @fpparts=split(/\//,$proname);  
                            my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];  
                            my $fperror='';  
                            for (my $i=3;$i<=$#fpparts;$i++) {  
                                $fpnow.='/'.$fpparts[$i];   
                                unless (-e $fpnow) {  
    unless (mkdir($fpnow,0777)) {  
                                       $fperror="error: ".($!+0)  
   ." mkdir failed while attempting "  
                                               ."makeuser\n";  
                                    }  
                                }  
                            }  
                            unless ($fperror) {  
        my $result=&make_passwd_file($uname, $umode,$npass,  
     $passfilename);  
        print $client $result;  
                            } else {  
                                print $client "$fperror\n";  
                            }  
                        }  
      } else {  
        print $client "refused\n";  
      }  
      umask($oldumask);  
 # -------------------------------------------------------------- changeuserauth  
                    } elsif ($userinput =~ /^changeuserauth/) {  
        &Debug("Changing authorization");  
       if ($wasenc==1) {  
                        my   
        ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);  
                        chomp($npass);  
        &Debug("cmd = ".$cmd." domain= ".$udom.  
       "uname =".$uname." umode= ".$umode);  
                        $npass=&unescape($npass);  
                        my $proname=&propath($udom,$uname);  
                        my $passfilename="$proname/passwd";  
        if ($udom ne $currentdomainid) {  
                            print $client "not_right_domain\n";  
                        } else {  
    my $result=&make_passwd_file($uname, $umode,$npass,  
  $passfilename);  
    print $client $result;  
                        }  
      } else {  
        print $client "refused\n";  
      }  
 # ------------------------------------------------------------------------ home  
                    } elsif ($userinput =~ /^home/) {  
                        my ($cmd,$udom,$uname)=split(/:/,$userinput);  
                        chomp($uname);  
                        my $proname=propath($udom,$uname);  
                        if (-e $proname) {  
                           print $client "found\n";  
                        } else {  
   print $client "not_found\n";  
                        }  
 # ---------------------------------------------------------------------- update  
                    } elsif ($userinput =~ /^update/) {  
                        my ($cmd,$fname)=split(/:/,$userinput);  
                        my $ownership=ishome($fname);  
                        if ($ownership eq 'not_owner') {  
                         if (-e $fname) {  
                           my ($dev,$ino,$mode,$nlink,  
                               $uid,$gid,$rdev,$size,  
                               $atime,$mtime,$ctime,  
                               $blksize,$blocks)=stat($fname);  
                           my $now=time;  
                           my $since=$now-$atime;  
                           if ($since>$perlvar{'lonExpire'}) {  
                               my $reply=  
                                     &reply("unsub:$fname","$hostid{$clientip}");  
                               unlink("$fname");  
                           } else {  
      my $transname="$fname.in.transfer";  
                              my $remoteurl=  
                                     reply("sub:$fname","$hostid{$clientip}");  
                              my $response;  
                               {  
                              my $ua=new LWP::UserAgent;  
                              my $request=new HTTP::Request('GET',"$remoteurl");  
                              $response=$ua->request($request,$transname);  
       }  
                              if ($response->is_error()) {  
  unlink($transname);  
                                  my $message=$response->status_line;  
                                  &logthis(  
                                   "LWP GET: $message for $fname ($remoteurl)");  
                              } else {  
                          if ($remoteurl!~/\.meta$/) {  
                                   my $ua=new LWP::UserAgent;  
                                   my $mrequest=  
                                    new HTTP::Request('GET',$remoteurl.'.meta');  
                                   my $mresponse=  
                                    $ua->request($mrequest,$fname.'.meta');  
                                   if ($mresponse->is_error()) {  
                     unlink($fname.'.meta');  
                                   }  
                          }  
                                  rename($transname,$fname);  
      }  
                           }  
                           print $client "ok\n";  
                         } else {  
                           print $client "not_found\n";  
                         }  
        } else {  
  print $client "rejected\n";  
                        }  
 # -------------------------------------- fetch a user file from a remote server  
                    } elsif ($userinput =~ /^fetchuserfile/) {  
                       my ($cmd,$fname)=split(/:/,$userinput);  
       my ($udom,$uname,$ufile)=split(/\//,$fname);  
                       my $udir=propath($udom,$uname).'/userfiles';  
                       unless (-e $udir) { mkdir($udir,0770); }  
                        if (-e $udir) {  
                        $ufile=~s/^[\.\~]+//;  
                        $ufile=~s/\///g;  
                        my $transname=$udir.'/'.$ufile;  
                        my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;  
                              my $response;  
                               {  
                              my $ua=new LWP::UserAgent;  
                              my $request=new HTTP::Request('GET',"$remoteurl");  
                              $response=$ua->request($request,$transname);  
       }  
                              if ($response->is_error()) {  
  unlink($transname);  
                                  my $message=$response->status_line;  
                                  &logthis(  
                                   "LWP GET: $message for $fname ($remoteurl)");  
  print $client "failed\n";  
                              } else {  
                                  print $client "ok\n";  
                              }  
                      } else {  
                        print $client "not_home\n";  
                      }   
 # ------------------------------------------ authenticate access to a user file  
                    } elsif ($userinput =~ /^tokenauthuserfile/) {  
                        my ($cmd,$fname,$session)=split(/:/,$userinput);  
                        chomp($session);  
                        my $reply='non_auth';  
                        if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.  
  $session.'.id')) {  
    while (my $line=<ENVIN>) {  
        if ($line=~/userfile\.$fname\=/) { $reply='ok'; }  
    }  
    close(ENVIN);  
    print $client $reply."\n";  
        } else {  
    print $client "invalid_token\n";  
                        }  
 # ----------------------------------------------------------------- unsubscribe  
                    } elsif ($userinput =~ /^unsub/) {  
                        my ($cmd,$fname)=split(/:/,$userinput);  
                        if (-e $fname) {  
    print $client &unsub($client,$fname,$clientip);  
                        } else {  
    print $client "not_found\n";  
                        }  
 # ------------------------------------------------------------------- subscribe  
                    } elsif ($userinput =~ /^sub/) {  
        print $client &subscribe($userinput,$clientip);  
 # ------------------------------------------------------------- current version  
                    } elsif ($userinput =~ /^currentversion/) {  
                        my ($cmd,$fname)=split(/:/,$userinput);  
        print $client &currentversion($fname)."\n";  
 # ------------------------------------------------------------------------- log  
                    } elsif ($userinput =~ /^log/) {  
                        my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);  
                        chomp($what);  
                        my $proname=propath($udom,$uname);  
                        my $now=time;  
                        {  
  my $hfh;  
  if ($hfh=IO::File->new(">>$proname/activity.log")) {   
                             print $hfh "$now:$hostid{$clientip}:$what\n";  
                             print $client "ok\n";   
  } else {  
                             print $client "error: ".($!+0)  
  ." IO::File->new Failed "  
                                     ."while attempting log\n";  
         }  
        }  
 # ------------------------------------------------------------------------- put  
                    } elsif ($userinput =~ /^put/) {  
                       my ($cmd,$udom,$uname,$namespace,$what)  
                           =split(/:/,$userinput);  
                       $namespace=~s/\//\_/g;  
                       $namespace=~s/\W//g;  
                       if ($namespace ne 'roles') {  
                        chomp($what);  
                        my $proname=propath($udom,$uname);  
                        my $now=time;  
                        unless ($namespace=~/^nohist\_/) {  
    my $hfh;  
    if (  
                              $hfh=IO::File->new(">>$proname/$namespace.hist")  
        ) { print $hfh "P:$now:$what\n"; }  
        }  
                        my @pairs=split(/\&/,$what);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
                            foreach my $pair (@pairs) {  
        my ($key,$value)=split(/=/,$pair);  
                                $hash{$key}=$value;  
                            }  
    if (untie(%hash)) {  
                               print $client "ok\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) failed ".  
                                       "while attempting put\n";  
                            }  
                        } else {  
                            print $client "error: ".($!)  
        ." tie(GDBM) Failed ".  
                                    "while attempting put\n";  
                        }  
       } else {  
                           print $client "refused\n";  
                       }  
 # -------------------------------------------------------------------- rolesput  
                    } elsif ($userinput =~ /^rolesput/) {  
        &Debug("rolesput");  
     if ($wasenc==1) {  
                        my ($cmd,$exedom,$exeuser,$udom,$uname,$what)  
                           =split(/:/,$userinput);  
        &Debug("cmd = ".$cmd." exedom= ".$exedom.  
     "user = ".$exeuser." udom=".$udom.  
     "what = ".$what);  
                        my $namespace='roles';  
                        chomp($what);  
                        my $proname=propath($udom,$uname);  
                        my $now=time;  
                        {  
    my $hfh;  
    if (  
                              $hfh=IO::File->new(">>$proname/$namespace.hist")  
        ) {   
                                   print $hfh "P:$now:$exedom:$exeuser:$what\n";  
                                  }  
        }  
                        my @pairs=split(/\&/,$what);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
                            foreach my $pair (@pairs) {  
        my ($key,$value)=split(/=/,$pair);  
        &ManagePermissions($key, $udom, $uname,  
   &GetAuthType( $udom,   
  $uname));  
                                $hash{$key}=$value;  
                            }  
    if (untie(%hash)) {  
                               print $client "ok\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting rolesput\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting rolesput\n";  
                        }  
       } else {  
                           print $client "refused\n";  
                       }  
 # -------------------------------------------------------------------- rolesdel  
                    } elsif ($userinput =~ /^rolesdel/) {  
        &Debug("rolesdel");  
     if ($wasenc==1) {  
                        my ($cmd,$exedom,$exeuser,$udom,$uname,$what)  
                           =split(/:/,$userinput);  
        &Debug("cmd = ".$cmd." exedom= ".$exedom.  
     "user = ".$exeuser." udom=".$udom.  
     "what = ".$what);  
                        my $namespace='roles';  
                        chomp($what);  
                        my $proname=propath($udom,$uname);  
                        my $now=time;  
                        {  
    my $hfh;  
    if (  
                              $hfh=IO::File->new(">>$proname/$namespace.hist")  
        ) {   
                                   print $hfh "D:$now:$exedom:$exeuser:$what\n";  
                                  }  
        }  
                        my @rolekeys=split(/\&/,$what);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
                            foreach my $key (@rolekeys) {  
                                delete $hash{$key};  
                            }  
    if (untie(%hash)) {  
                               print $client "ok\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting rolesdel\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting rolesdel\n";  
                        }  
       } else {  
                           print $client "refused\n";  
                       }  
 # ------------------------------------------------------------------------- get  
                    } elsif ($userinput =~ /^get/) {  
                        my ($cmd,$udom,$uname,$namespace,$what)  
                           =split(/:/,$userinput);  
                        $namespace=~s/\//\_/g;  
                        $namespace=~s/\W//g;  
                        chomp($what);  
                        my @queries=split(/\&/,$what);  
                        my $proname=propath($udom,$uname);  
                        my $qresult='';  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
                            for (my $i=0;$i<=$#queries;$i++) {  
                                $qresult.="$hash{$queries[$i]}&";  
                            }  
    if (untie(%hash)) {  
               $qresult=~s/\&$//;  
                               print $client "$qresult\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting get\n";  
                            }  
                        } else {  
                            if ($!+0 == 2) {  
                                print $client "error:No such file or ".  
                                    "GDBM reported bad block error\n";  
                            } else {  
                                print $client "error: ".($!+0)  
                                    ." tie(GDBM) Failed ".  
                                        "while attempting get\n";  
                            }  
                        }  
 # ------------------------------------------------------------------------ eget  
                    } elsif ($userinput =~ /^eget/) {  
                        my ($cmd,$udom,$uname,$namespace,$what)  
                           =split(/:/,$userinput);  
                        $namespace=~s/\//\_/g;  
                        $namespace=~s/\W//g;  
                        chomp($what);  
                        my @queries=split(/\&/,$what);  
                        my $proname=propath($udom,$uname);  
                        my $qresult='';  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
                            for (my $i=0;$i<=$#queries;$i++) {  
                                $qresult.="$hash{$queries[$i]}&";  
                            }  
    if (untie(%hash)) {  
               $qresult=~s/\&$//;  
                               if ($cipher) {  
                                 my $cmdlength=length($qresult);  
                                 $qresult.="         ";  
                                 my $encqresult='';  
                                 for   
  (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {  
                                  $encqresult.=  
                                  unpack("H16",  
                                  $cipher->encrypt(substr($qresult,$encidx,8)));  
                                 }  
                                 print $client "enc:$cmdlength:$encqresult\n";  
       } else {  
         print $client "error:no_key\n";  
                               }  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting eget\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting eget\n";  
                        }  
 # ------------------------------------------------------------------------- del  
                    } elsif ($userinput =~ /^del/) {  
                        my ($cmd,$udom,$uname,$namespace,$what)  
                           =split(/:/,$userinput);  
                        $namespace=~s/\//\_/g;  
                        $namespace=~s/\W//g;  
                        chomp($what);  
                        my $proname=propath($udom,$uname);  
                        my $now=time;  
                        unless ($namespace=~/^nohist\_/) {  
    my $hfh;  
    if (  
                              $hfh=IO::File->new(">>$proname/$namespace.hist")  
        ) { print $hfh "D:$now:$what\n"; }  
        }  
                        my @keys=split(/\&/,$what);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
                            foreach my $key (@keys) {  
                                delete($hash{$key});  
                            }  
    if (untie(%hash)) {  
                               print $client "ok\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting del\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting del\n";  
                        }  
 # ------------------------------------------------------------------------ keys  
                    } elsif ($userinput =~ /^keys/) {  
                        my ($cmd,$udom,$uname,$namespace)  
                           =split(/:/,$userinput);  
                        $namespace=~s/\//\_/g;  
                        $namespace=~s/\W//g;  
                        my $proname=propath($udom,$uname);  
                        my $qresult='';  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
                            foreach my $key (keys %hash) {  
                                $qresult.="$key&";  
                            }  
    if (untie(%hash)) {  
               $qresult=~s/\&$//;  
                               print $client "$qresult\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting keys\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting keys\n";  
                        }  
 # ----------------------------------------------------------------- dumpcurrent  
                    } elsif ($userinput =~ /^currentdump/) {  
                        my ($cmd,$udom,$uname,$namespace)  
                           =split(/:/,$userinput);  
                        $namespace=~s/\//\_/g;  
                        $namespace=~s/\W//g;  
                        my $qresult='';  
                        my $proname=propath($udom,$uname);  
        my %hash;  
                        if (tie(%hash,'GDBM_File',  
                                "$proname/$namespace.db",  
                                &GDBM_READER(),0640)) {  
                            # Structure of %data:  
                            # $data{$symb}->{$parameter}=$value;  
                            # $data{$symb}->{'v.'.$parameter}=$version;  
                            # since $parameter will be unescaped, we do not  
                            # have to worry about silly parameter names...  
                            my %data = ();  
                            while (my ($key,$value) = each(%hash)) {  
                               my ($v,$symb,$param) = split(/:/,$key);  
                               next if ($v eq 'version' || $symb eq 'keys');  
                               next if (exists($data{$symb}) &&   
                                        exists($data{$symb}->{$param}) &&  
                                        $data{$symb}->{'v.'.$param} > $v);  
                               $data{$symb}->{$param}=$value;  
                               $data{$symb}->{'v.'.$param}=$v;  
                            }  
                            if (untie(%hash)) {  
                              while (my ($symb,$param_hash) = each(%data)) {  
                                while(my ($param,$value) = each (%$param_hash)){  
                                  next if ($param =~ /^v\./);  
                                  $qresult.=$symb.':'.$param.'='.$value.'&';  
                                }  
                              }  
                              chop($qresult);  
                              print $client "$qresult\n";  
                            } else {  
                              print $client "error: ".($!+0)  
  ." untie(GDBM) Failed ".  
                                      "while attempting currentdump\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                       "while attempting currentdump\n";  
                        }  
 # ------------------------------------------------------------------------ dump  
                    } elsif ($userinput =~ /^dump/) {  
                        my ($cmd,$udom,$uname,$namespace,$regexp)  
                           =split(/:/,$userinput);  
                        $namespace=~s/\//\_/g;  
                        $namespace=~s/\W//g;  
                        if (defined($regexp)) {  
                           $regexp=&unescape($regexp);  
        } else {  
                           $regexp='.';  
        }  
                        my $qresult='';  
                        my $proname=propath($udom,$uname);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
                            study($regexp);  
                            while (my ($key,$value) = each(%hash)) {  
                                if ($regexp eq '.') {  
                                    $qresult.=$key.'='.$value.'&';  
                                } else {  
                                    my $unescapeKey = &unescape($key);  
                                    if (eval('$unescapeKey=~/$regexp/')) {  
                                        $qresult.="$key=$value&";  
                                    }  
                                }  
                            }  
                            if (untie(%hash)) {  
                                chop($qresult);  
                                print $client "$qresult\n";  
                            } else {  
                                print $client "error: ".($!+0)  
    ." untie(GDBM) Failed ".  
                                        "while attempting dump\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                       "while attempting dump\n";  
                        }  
 # ----------------------------------------------------------------------- store  
                    } elsif ($userinput =~ /^store/) {  
                       my ($cmd,$udom,$uname,$namespace,$rid,$what)  
                           =split(/:/,$userinput);  
                       $namespace=~s/\//\_/g;  
                       $namespace=~s/\W//g;  
                       if ($namespace ne 'roles') {  
                        chomp($what);  
                        my $proname=propath($udom,$uname);  
                        my $now=time;  
                        unless ($namespace=~/^nohist\_/) {  
    my $hfh;  
    if (  
                              $hfh=IO::File->new(">>$proname/$namespace.hist")  
        ) { print $hfh "P:$now:$rid:$what\n"; }  
        }  
                        my @pairs=split(/\&/,$what);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  
                            my @previouskeys=split(/&/,$hash{"keys:$rid"});  
                            my $key;  
                            $hash{"version:$rid"}++;  
                            my $version=$hash{"version:$rid"};  
                            my $allkeys='';   
                            foreach my $pair (@pairs) {  
        my ($key,$value)=split(/=/,$pair);  
                                $allkeys.=$key.':';  
                                $hash{"$version:$rid:$key"}=$value;  
                            }  
                            $hash{"$version:$rid:timestamp"}=$now;  
                            $allkeys.='timestamp';  
                            $hash{"$version:keys:$rid"}=$allkeys;  
    if (untie(%hash)) {  
                               print $client "ok\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting store\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting store\n";  
                        }  
       } else {  
                           print $client "refused\n";  
                       }  
 # --------------------------------------------------------------------- restore  
                    } elsif ($userinput =~ /^restore/) {  
                        my ($cmd,$udom,$uname,$namespace,$rid)  
                           =split(/:/,$userinput);  
                        $namespace=~s/\//\_/g;  
                        $namespace=~s/\W//g;  
                        chomp($rid);  
                        my $proname=propath($udom,$uname);  
                        my $qresult='';  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
                   my $version=$hash{"version:$rid"};  
                            $qresult.="version=$version&";  
                            my $scope;  
                            for ($scope=1;$scope<=$version;$scope++) {  
       my $vkeys=$hash{"$scope:keys:$rid"};  
                               my @keys=split(/:/,$vkeys);  
                               my $key;  
                               $qresult.="$scope:keys=$vkeys&";  
                               foreach $key (@keys) {  
      $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";  
                               }                                    
                            }  
    if (untie(%hash)) {  
               $qresult=~s/\&$//;  
                               print $client "$qresult\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting restore\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting restore\n";  
                        }  
 # -------------------------------------------------------------------- chatsend  
                    } elsif ($userinput =~ /^chatsend/) {  
                        my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);  
                        &chatadd($cdom,$cnum,$newpost);  
                        print $client "ok\n";  
 # -------------------------------------------------------------------- chatretr  
                    } elsif ($userinput =~ /^chatretr/) {  
                        my   
                         ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);  
                        my $reply='';  
                        foreach (&getchat($cdom,$cnum,$udom,$uname)) {  
    $reply.=&escape($_).':';  
                        }  
                        $reply=~s/\:$//;  
                        print $client $reply."\n";  
 # ------------------------------------------------------------------- querysend  
                    } elsif ($userinput =~ /^querysend/) {  
                        my ($cmd,$query,  
    $arg1,$arg2,$arg3)=split(/\:/,$userinput);  
        $query=~s/\n*$//g;  
        print $client "".  
        sqlreply("$hostid{$clientip}\&$query".  
  "\&$arg1"."\&$arg2"."\&$arg3")."\n";  
 # ------------------------------------------------------------------ queryreply  
                    } elsif ($userinput =~ /^queryreply/) {  
                        my ($cmd,$id,$reply)=split(/:/,$userinput);   
        my $store;  
                        my $execdir=$perlvar{'lonDaemons'};  
                        if ($store=IO::File->new(">$execdir/tmp/$id")) {  
    $reply=~s/\&/\n/g;  
    print $store $reply;  
    close $store;  
    my $store2=IO::File->new(">$execdir/tmp/$id.end");  
    print $store2 "done\n";  
    close $store2;  
    print $client "ok\n";  
        }  
        else {  
    print $client "error: ".($!+0)  
        ." IO::File->new Failed ".  
                                    "while attempting queryreply\n";  
        }  
 # ----------------------------------------------------------------- courseidput  
                    } elsif ($userinput =~ /^courseidput/) {  
                        my ($cmd,$udom,$what)=split(/:/,$userinput);  
                        chomp($what);  
                        $udom=~s/\W//g;  
                        my $proname=  
                               "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";  
                        my $now=time;  
                        my @pairs=split(/\&/,$what);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {  
                            foreach my $pair (@pairs) {  
        my ($key,$value)=split(/=/,$pair);  
                                $hash{$key}=$value.':'.$now;  
                            }  
    if (untie(%hash)) {  
                               print $client "ok\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting courseidput\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                       "while attempting courseidput\n";  
                        }  
 # ---------------------------------------------------------------- courseiddump  
                    } elsif ($userinput =~ /^courseiddump/) {  
                        my ($cmd,$udom,$since,$description)  
                           =split(/:/,$userinput);  
                        if (defined($description)) {  
                           $description=&unescape($description);  
        } else {  
                           $description='.';  
        }  
                        unless (defined($since)) { $since=0; }  
                        my $qresult='';  
                        my $proname=  
                               "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {  
                            while (my ($key,$value) = each(%hash)) {  
                                my ($descr,$lasttime)=split(/\:/,$value);  
                                if ($lasttime<$since) { next; }  
                                if ($description eq '.') {  
                                    $qresult.=$key.'='.$descr.'&';  
                                } else {  
                                    my $unescapeVal = &unescape($descr);  
                                    if (eval('$unescapeVal=~/$description/i')) {  
                                        $qresult.="$key=$descr&";  
                                    }  
                                }  
                            }  
                            if (untie(%hash)) {  
                                chop($qresult);  
                                print $client "$qresult\n";  
                            } else {  
                                print $client "error: ".($!+0)  
    ." untie(GDBM) Failed ".  
                                        "while attempting courseiddump\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                       "while attempting courseiddump\n";  
                        }  
 # ----------------------------------------------------------------------- idput  
                    } elsif ($userinput =~ /^idput/) {  
                        my ($cmd,$udom,$what)=split(/:/,$userinput);  
                        chomp($what);  
                        $udom=~s/\W//g;  
                        my $proname="$perlvar{'lonUsersDir'}/$udom/ids";  
                        my $now=time;  
                        {  
    my $hfh;  
    if (  
                              $hfh=IO::File->new(">>$proname.hist")  
        ) { print $hfh "P:$now:$what\n"; }  
        }  
                        my @pairs=split(/\&/,$what);  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {  
                            foreach my $pair (@pairs) {  
        my ($key,$value)=split(/=/,$pair);  
                                $hash{$key}=$value;  
                            }  
    if (untie(%hash)) {  
                               print $client "ok\n";  
                            } else {  
                               print $client "error: ".($!+0)  
   ." untie(GDBM) Failed ".  
                                       "while attempting idput\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                       "while attempting idput\n";  
                        }  
 # ----------------------------------------------------------------------- idget  
                    } elsif ($userinput =~ /^idget/) {  
                        my ($cmd,$udom,$what)=split(/:/,$userinput);  
                        chomp($what);  
                        $udom=~s/\W//g;  
                        my $proname="$perlvar{'lonUsersDir'}/$udom/ids";  
                        my @queries=split(/\&/,$what);  
                        my $qresult='';  
        my %hash;  
        if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {  
                            for (my $i=0;$i<=$#queries;$i++) {  
                                $qresult.="$hash{$queries[$i]}&";  
                            }  
    if (untie(%hash)) {  
        $qresult=~s/\&$//;  
        print $client "$qresult\n";  
                            } else {  
        print $client "error: ".($!+0)  
    ." untie(GDBM) Failed ".  
        "while attempting idget\n";  
                            }  
                        } else {  
                            print $client "error: ".($!+0)  
        ." tie(GDBM) Failed ".  
                                    "while attempting idget\n";  
                        }  
 # ---------------------------------------------------------------------- tmpput  
                    } elsif ($userinput =~ /^tmpput/) {  
                        my ($cmd,$what)=split(/:/,$userinput);  
        my $store;  
                        $tmpsnum++;  
                        my $id=$$.'_'.$clientip.'_'.$tmpsnum;  
                        $id=~s/\W/\_/g;  
                        $what=~s/\n//g;  
                        my $execdir=$perlvar{'lonDaemons'};  
                        if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {  
    print $store $what;  
    close $store;  
    print $client "$id\n";  
        }  
        else {  
    print $client "error: ".($!+0)  
        ."IO::File->new Failed ".  
                                    "while attempting tmpput\n";  
        }  
   
 # ---------------------------------------------------------------------- tmpget      ResetStatistics();
                    } elsif ($userinput =~ /^tmpget/) {  
                        my ($cmd,$id)=split(/:/,$userinput);  
                        chomp($id);  
                        $id=~s/\W/\_/g;  
                        my $store;  
                        my $execdir=$perlvar{'lonDaemons'};  
                        if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {  
                            my $reply=<$store>;  
    print $client "$reply\n";  
                            close $store;  
        }  
        else {  
    print $client "error: ".($!+0)  
        ."IO::File->new Failed ".  
                                    "while attempting tmpget\n";  
        }  
   
 # ---------------------------------------------------------------------- tmpdel  # ------------------------------------------------------------ Process requests
                    } elsif ($userinput =~ /^tmpdel/) {      my $KeepGoing = 1;
                        my ($cmd,$id)=split(/:/,$userinput);      while ((my $userinput=GetRequest) && $KeepGoing) {
                        chomp($id);   $KeepGoing = ProcessRequest($userinput);
                        $id=~s/\W/\_/g;  
                        my $execdir=$perlvar{'lonDaemons'};  
                        if (unlink("$execdir/tmp/$id.tmp")) {  
    print $client "ok\n";  
        } else {  
    print $client "error: ".($!+0)  
        ."Unlink tmp Failed ".  
                                    "while attempting tmpdel\n";  
        }  
 # -------------------------------------------------------------------------- ls  
                    } elsif ($userinput =~ /^ls/) {  
                        my ($cmd,$ulsdir)=split(/:/,$userinput);  
                        my $ulsout='';  
                        my $ulsfn;  
                        if (-e $ulsdir) {  
                            if(-d $ulsdir) {  
                                if (opendir(LSDIR,$ulsdir)) {  
                                    while ($ulsfn=readdir(LSDIR)) {  
                                        my @ulsstats=stat($ulsdir.'/'.$ulsfn);  
                                        $ulsout.=$ulsfn.'&'.  
                                                 join('&',@ulsstats).':';  
                                    }  
                                    closedir(LSDIR);  
                                }  
                            } else {  
                                my @ulsstats=stat($ulsdir);  
                                $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';  
                            }  
                        } else {  
                           $ulsout='no_such_dir';  
                        }  
                        if ($ulsout eq '') { $ulsout='empty'; }  
                        print $client "$ulsout\n";  
 # ------------------------------------------------------------------ Hanging up  
                    } elsif (($userinput =~ /^exit/) ||  
                             ($userinput =~ /^init/)) {  
                        &logthis(  
       "Client $clientip ($hostid{$clientip}) hanging up: $userinput");  
                        print $client "bye\n";  
                        $client->close();  
        last;  
 # ------------------------------------------------------------- unknown command  
    } elsif ($userinput =~ /^sethost:/) {  
        print $client &sethost($userinput)."\n";  
    } elsif ($userinput =~/^version:/) {  
        print $client &version($userinput)."\n";  
                    } else {  
                        # unknown command  
                        print $client "unknown_cmd\n";  
                    }  
 # -------------------------------------------------------------------- complete  # -------------------------------------------------------------------- complete
    alarm(0);  
                    &status('Listening to '.$hostid{$clientip});  
        }  
 # --------------------------------------------- client unknown or fishy, refuse  
             } else {  
         print $client "refused\n";  
                 $client->close();  
                 &logthis("<font color=blue>WARNING: "  
                 ."Rejected client $clientip, closing connection</font>");  
             }  
  }               
   
    &status('Listening to '.$clientname);
       }
   # --------------------------------------------- client unknown or fishy, refuse
    } else {
       print $client "refused\n";
       $client->close();
       &logthis("<font color=blue>WARNING: "
        ."Rejected client $clientip, closing connection</font>");
    }
       }             
       
 # =============================================================================  # =============================================================================
              
  &logthis("<font color=red>CRITICAL: "      &logthis("<font color=red>CRITICAL: "
  ."Disconnect from $clientip ($hostid{$clientip})</font>");           ."Disconnect from $clientip ($clientname)</font>");    
       
       
         # this exit is VERY important, otherwise the child will become      # this exit is VERY important, otherwise the child will become
         # a producer of more and more children, forking yourself into      # a producer of more and more children, forking yourself into
         # process death.      # process death.
         exit;      exit;
           
 }  }
   
Line 1880  sub chatadd { Line 4042  sub chatadd {
     my %hash;      my %hash;
     my $proname=&propath($cdom,$cname);      my $proname=&propath($cdom,$cname);
     my @entries=();      my @entries=();
       my $time=time;
     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",      if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
     &GDBM_WRCREAT(),0640)) {      &GDBM_WRCREAT(),0640)) {
  @entries=map { $_.':'.$hash{$_} } sort keys %hash;   @entries=map { $_.':'.$hash{$_} } sort keys %hash;
  my $time=time;  
  my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);   my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
  my ($thentime,$idnum)=split(/\_/,$lastid);   my ($thentime,$idnum)=split(/\_/,$lastid);
  my $newid=$time.'_000000';   my $newid=$time.'_000000';
Line 1903  sub chatadd { Line 4065  sub chatadd {
  }   }
  untie %hash;   untie %hash;
     }      }
       {
    my $hfh;
    if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
       print $hfh "$time:".&unescape($newchat)."\n";
    }
       }
 }  }
   
 sub unsub {  sub unsub {
     my ($fname,$clientip)=@_;      my ($fname,$clientip)=@_;
     my $result;      my $result;
     if (unlink("$fname.$hostid{$clientip}")) {      if (unlink("$fname.$clientname")) {
  $result="ok\n";   $result="ok\n";
     } else {      } else {
  $result="not_subscribed\n";   $result="not_subscribed\n";
     }      }
     if (-e "$fname.subscription") {      if (-e "$fname.subscription") {
  my $found=&addline($fname,$hostid{$clientip},$clientip,'');   my $found=&addline($fname,$clientname,$clientip,'');
  if ($found) { $result="ok\n"; }   if ($found) { $result="ok\n"; }
     } else {      } else {
  if ($result != "ok\n") { $result="not_subscribed\n"; }   if ($result != "ok\n") { $result="not_subscribed\n"; }
Line 1946  sub currentversion { Line 4114  sub currentversion {
 # see if this is a regular file (ignore links produced earlier)  # see if this is a regular file (ignore links produced earlier)
     my $thisfile=$ulsdir.'/'.$ulsfn;      my $thisfile=$ulsdir.'/'.$ulsfn;
     unless (-l $thisfile) {      unless (-l $thisfile) {
  if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E/) {   if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
     if ($1>$version) { $version=$1; }      if ($1>$version) { $version=$1; }
  }   }
     }      }
Line 1994  sub subscribe { Line 4162  sub subscribe {
     if (-d $fname) {      if (-d $fname) {
  $result="directory\n";   $result="directory\n";
     } else {      } else {
  if (-e "$fname.$hostid{$clientip}") {&unsub($fname,$clientip);}   if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
  my $now=time;   my $now=time;
  my $found=&addline($fname,$hostid{$clientip},$clientip,   my $found=&addline($fname,$clientname,$clientip,
    "$hostid{$clientip}:$clientip:$now\n");     "$clientname:$clientip:$now\n");
  if ($found) { $result="$fname\n"; }   if ($found) { $result="$fname\n"; }
  # if they were subscribed to only meta data, delete that   # if they were subscribed to only meta data, delete that
                 # subscription, when you subscribe to a file you also get                  # subscription, when you subscribe to a file you also get
Line 2088  sub version { Line 4256  sub version {
     $remoteVERSION=(split(/:/,$userinput))[1];      $remoteVERSION=(split(/:/,$userinput))[1];
     return "version:$VERSION";      return "version:$VERSION";
 }  }
   ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<
 #There is a copy of this in lonnet.pm  #There is a copy of this in lonnet.pm
   #   Can we hoist these lil' things out into common places?
   #
 sub userload {  sub userload {
     my $numusers=0;      my $numusers=0;
     {      {
Line 2098  sub userload { Line 4268  sub userload {
  my $curtime=time;   my $curtime=time;
  while ($filename=readdir(LONIDS)) {   while ($filename=readdir(LONIDS)) {
     if ($filename eq '.' || $filename eq '..') {next;}      if ($filename eq '.' || $filename eq '..') {next;}
     my ($atime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[8];      my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
     if ($curtime-$atime < 3600) { $numusers++; }      if ($curtime-$mtime < 1800) { $numusers++; }
  }   }
  closedir(LONIDS);   closedir(LONIDS);
     }      }
Line 2221  each connection is logged. Line 4391  each connection is logged.
   
 =item *  =item *
   
   SIGUSR2
   
   Parent Signal assignment:
       $SIG{USR2} = \&UpdateHosts
   
   Child signal assignment:
       NONE
   
   
   =item *
   
 SIGCHLD  SIGCHLD
   
 Parent signal assignment:  Parent signal assignment:
Line 2381  Send along temporarily stored informatio Line 4562  Send along temporarily stored informatio
   
 List part of a user's directory.  List part of a user's directory.
   
   =item pushtable
   
   Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
   hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
   must be restored manually in case of a problem with the new table file.
   pushtable requires that the request be encrypted and validated via
   ValidateManager.  The form of the command is:
   enc:pushtable tablename <tablecontents> \n
   where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
   cleartext newline.
   
 =item Hanging up (exit or init)  =item Hanging up (exit or init)
   
 What to do when a client tells the server that they (the client)  What to do when a client tells the server that they (the client)
Line 2391  are leaving the network. Line 4583  are leaving the network.
 If B<lond> is sent an unknown command (not in the list above),  If B<lond> is sent an unknown command (not in the list above),
 it replys to the client "unknown_cmd".  it replys to the client "unknown_cmd".
   
   
 =item UNKNOWN CLIENT  =item UNKNOWN CLIENT
   
 If the anti-spoofing algorithm cannot verify the client,  If the anti-spoofing algorithm cannot verify the client,

Removed from v.1.134  
changed lines
  Added in v.1.178.2.2


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