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Diff for /loncom/lond between versions 1.178.2.2 and 1.235

version 1.178.2.2, 2004/02/23 10:25:52 version 1.235, 2004/08/24 05:13:40
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
 #  #
Line 45  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 localenroll;
 use File::Copy;  use File::Copy;
 use LONCAPA::ConfigFileEdit;  use LONCAPA::ConfigFileEdit;
   use LONCAPA::lonlocal;
   use LONCAPA::lonssl;
   use Fcntl qw(:flock);
   
 my $DEBUG = 1;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
 my $status='';  my $status='';
 my $lastlog='';  my $lastlog='';
   
 my $VERSION='$Revision$'; #' stupid emacs  my $VERSION='$Revision$'; #' stupid emacs
 my $remoteVERSION;  my $remoteVERSION;
 my $currenthostid;  my $currenthostid="default";
 my $currentdomainid;  my $currentdomainid;
   
 my $client;  my $client;
 my $clientip;  my $clientip; # IP address of client.
 my $clientname;  my $clientdns; # DNS name of client.
   my $clientname; # LonCAPA name of client.
 my $cipher; # Cipher key negotiated with client.  
 my $tmpsnum = 0;; # Id of tmpputs.  
   
 my $server;  my $server;
 my $thisserver;  my $thisserver; # DNS of us.
   
   my $keymode;
   
   my $cipher; # Cipher key negotiated with client
   my $tmpsnum = 0; # Id of tmpputs.
   
 #   # 
 #   Connection type is:  #   Connection type is:
Line 77  my $thisserver; Line 84  my $thisserver;
   
 my $ConnectionType;  my $ConnectionType;
   
 my %hostid;  my %hostid; # ID's for hosts in cluster by ip.
 my %hostdom;  my %hostdom; # LonCAPA domain for hosts in cluster.
 my %hostip;  my %hostip; # IPs for hosts in cluster.
   my %hostdns; # ID's of hosts looked up by DNS name.
   
 my %managers; # Ip -> manager names  my %managers; # Ip -> manager names
   
Line 98  my $CLIENT_OK  = 1; Line 106  my $CLIENT_OK  = 1;
 my $MANAGER_OK = 2;  my $MANAGER_OK = 2;
 my %Dispatcher;  my %Dispatcher;
   
   
 #  #
 #  The array below are password error strings."  #  The array below are password error strings."
 #  #
Line 113  my @passwderrors = ("ok", Line 122  my @passwderrors = ("ok",
    "lcpasswd Cannot set new passwd.",     "lcpasswd Cannot set new passwd.",
    "lcpasswd Username has invalid characters",     "lcpasswd Username has invalid characters",
    "lcpasswd Invalid characters in password",     "lcpasswd Invalid characters in password",
     "11", "12",     "lcpasswd User already exists", 
     "lcpasswd Password mismatch");                     "lcpasswd Something went wrong with user addition.",
       "lcpasswd Password mismatch",
       "lcpasswd Error filename is invalid");
   
   
 #  The array below are lcuseradd error strings.:  #  The array below are lcuseradd error strings.:
Line 135  my @adderrors    = ("ok", Line 146  my @adderrors    = ("ok",
     "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.  #   Statistics that are maintained and dislayed in the status line.
 #  #
 my $Transactions; # Number of attempted transactions.  my $Transactions = 0; # Number of attempted transactions.
 my $Failures; # Number of transcations failed.  my $Failures     = 0; # Number of transcations failed.
   
 #   ResetStatistics:   #   ResetStatistics: 
 #      Resets the statistics counters:  #      Resets the statistics counters:
Line 149  sub ResetStatistics { Line 162  sub ResetStatistics {
     $Failures     = 0;      $Failures     = 0;
 }  }
   
   #------------------------------------------------------------------------
   #
   #   LocalConnection
   #     Completes the formation of a locally authenticated connection.
   #     This function will ensure that the 'remote' client is really the
   #     local host.  If not, the connection is closed, and the function fails.
   #     If so, initcmd is parsed for the name of a file containing the
   #     IDEA session key.  The fie is opened, read, deleted and the session
   #     key returned to the caller.
   #
   # Parameters:
   #   $Socket      - Socket open on client.
   #   $initcmd     - The full text of the init command.
   #
   # Implicit inputs:
   #    $clientdns  - The DNS name of the remote client.
   #    $thisserver - Our DNS name.
   #
   # Returns:
   #     IDEA session key on success.
   #     undef on failure.
   #
   sub LocalConnection {
       my ($Socket, $initcmd) = @_;
       Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
       if($clientdns ne $thisserver) {
    &logthis('<font color="red"> LocalConnection rejecting non local: '
    ."$clientdns ne $thisserver </font>");
    close $Socket;
    return undef;
       }  else {
    chomp($initcmd); # Get rid of \n in filename.
    my ($init, $type, $name) = split(/:/, $initcmd);
    Debug(" Init command: $init $type $name ");
   
    # Require that $init = init, and $type = local:  Otherwise
    # the caller is insane:
   
    if(($init ne "init") && ($type ne "local")) {
       &logthis('<font color = "red"> LocalConnection: caller is insane! '
        ."init = $init, and type = $type </font>");
       close($Socket);;
       return undef;
   
    }
    #  Now get the key filename:
   
    my $IDEAKey = lonlocal::ReadKeyFile($name);
    return $IDEAKey;
       }
   }
   #------------------------------------------------------------------------------
   #
   #  SSLConnection
   #   Completes the formation of an ssh authenticated connection. The
   #   socket is promoted to an ssl socket.  If this promotion and the associated
   #   certificate exchange are successful, the IDEA key is generated and sent
   #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
   #   the caller after the SSL tunnel is torn down.
   #
   # Parameters:
   #   Name              Type             Purpose
   #   $Socket          IO::Socket::INET  Plaintext socket.
   #
   # Returns:
   #    IDEA key on success.
   #    undef on failure.
   #
   sub SSLConnection {
       my $Socket   = shift;
   
       Debug("SSLConnection: ");
       my $KeyFile         = lonssl::KeyFile();
       if(!$KeyFile) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get key file $err </font>");
    return undef;
       }
       my ($CACertificate,
    $Certificate) = lonssl::CertificateFile();
   
   
       # If any of the key, certificate or certificate authority 
       # certificate filenames are not defined, this can't work.
   
       if((!$Certificate) || (!$CACertificate)) {
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL"
    ."Can't get certificates: $err </font>");
   
    return undef;
       }
       Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
   
       # Indicate to our peer that we can procede with
       # a transition to ssl authentication:
   
       print $Socket "ok:ssl\n";
   
       Debug("Approving promotion -> ssl");
       #  And do so:
   
       my $SSLSocket = lonssl::PromoteServerSocket($Socket,
    $CACertificate,
    $Certificate,
    $KeyFile);
       if(! ($SSLSocket) ) { # SSL socket promotion failed.
    my $err = lonssl::LastError();
    &logthis("<font color=\"red\"> CRITICAL "
    ."SSL Socket promotion failed: $err </font>");
    return undef;
       }
       Debug("SSL Promotion successful");
   
       # 
       #  The only thing we'll use the socket for is to send the IDEA key
       #  to the peer:
   
       my $Key = lonlocal::CreateCipherKey();
       print $SSLSocket "$Key\n";
   
       lonssl::Close($SSLSocket); 
   
       Debug("Key exchange complete: $Key");
   
       return $Key;
   }
   #
   #     InsecureConnection: 
   #        If insecure connections are allowd,
   #        exchange a challenge with the client to 'validate' the
   #        client (not really, but that's the protocol):
   #        We produce a challenge string that's sent to the client.
   #        The client must then echo the challenge verbatim to us.
   #
   #  Parameter:
   #      Socket      - Socket open on the client.
   #  Returns:
   #      1           - success.
   #      0           - failure (e.g.mismatch or insecure not allowed).
   #
   sub InsecureConnection {
       my $Socket  =  shift;
   
       #   Don't even start if insecure connections are not allowed.
   
       if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
    return 0;
       }
   
       #   Fabricate a challenge string and send it..
   
       my $challenge = "$$".time; # pid + time.
       print $Socket "$challenge\n";
       &status("Waiting for challenge reply");
   
       my $answer = <$Socket>;
       $answer    =~s/\W//g;
       if($challenge eq $answer) {
    return 1;
       } else {
    logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
    &status("No challenge reqply");
    return 0;
       }
       
   
   }
   
   #
   #   GetCertificate: Given a transaction that requires a certificate,
   #   this function will extract the certificate from the transaction
   #   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;
   }
   
 #  #
 #   Return true if client is a manager.  #   Return true if client is a manager.
 #  #
Line 164  sub isClient { Line 364  sub isClient {
   
   
 #  #
 #   Get a Request:  #   ReadManagerTable: Reads in the current manager table. For now this is
 #   Gets a Request message from the client.  The transaction  #                     done on each manager authentication because:
 #   is defined as a 'line' of text.  We remove the new line  #                     - These authentications are not frequent
 #   from the text line.    #                     - This allows dynamic changes to the manager table
 #     #                       without the need to signal to the lond.
 sub GetRequest {  #
     my $input = <$client>;  sub ReadManagerTable {
     chomp($input);  
   
     Debug("Request = $input\n");      #   Clean out the old table first..
   
     &status('Processing '.$clientname.':'.$input);     foreach my $key (keys %managers) {
         delete $managers{$key};
      }
   
     return $input;     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.
            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;
 }  }
 #  #
 #   Decipher encoded traffic  #  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, $newfile) = @_;
   
       #  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:  #  Parameters:
 #     input      - Encoded data.  #       Name of the file
   #       File Contents.
   #  Return:
   #      nonzero - success.
   #      0       - failure and $! has an errno.
   #
   sub InstallFile {
   
       my ($Filename, $Contents) = @_;
       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:  #  Returns:
 #     Decoded data or undef if encryption key was not yet negotiated.  #      Full path to the file or undef if the selector is invalid.
 #  Implicit input:  
 #     cipher  - This global holds the negotiated encryption key.  
 #  #
 sub Decipher {  sub ConfigFileFromSelector {
    my $input  = shift;      my $selector   = shift;
    my $output = '';      my $tablefile;
      
          my $tabledir = $perlvar{'lonTabDir'}.'/';
    if($cipher) {      if ($selector eq "hosts") {
       my($enc, $enclength, $encinput) = split(/:/, $input);   $tablefile = $tabledir."hosts.tab";
       for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {      } elsif ($selector eq "domain") {
          $output .=    $tablefile = $tabledir."domain.tab";
             $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));      } else {
       }   return undef;
       return substr($output, 0, $enclength);      }
    } else {      return $tablefile;
       return undef;  
    }  }
      #
   #   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";
   
 }  }
   
 #  #
 #   Register a command processor.  This function is invoked to register a sub  #  Called to re-init either lonc or lond.
 #   to process a request.  Once registered, the ProcessRequest sub can automatically  #
 #   dispatch requests to an appropriate sub, and do the top level validity checking  #  Parameters:
 #   as well:  #    request   - The full request by the client.  This is of the form
 #    - Is the keyword recognized.  #                reinit:<process>  
 #    - Is the proper client type attempting the request.  #                where <process> is allowed to be either of 
 #    - Is the request encrypted if it has to be.  #                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:  #   Parameters:
 #    $RequestName         - Name of the request being registered.  #     scriptline - A line to validate (\n has been stripped for what it's worth).
 #                           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 {  #   Return:
    my $RequestName    = shift;  #      0     - Invalid scriptline.
    my $Procedure      = shift;  #      1     - Valid scriptline
    my $MustEncode     = shift;  #  NOTE:
    my $ClientOk       = shift;  #     Only the command syntax is checked, not the executability of the
    my $ManagerOk      = shift;  #     command.
      #
    #  Don't allow duplication#  sub isValidEditCommand {
          my $scriptline = shift;
    if (defined $Dispatcher{$RequestName}) {  
       die "Attempting to define a duplicate request handler for $RequestName\n";      #   Line elements are pipe separated:
    }  
    #   Build the client type mask:      my ($command, $key, $newline)  = split(/\|/, $scriptline);
          &logthis('<font color="green"> isValideditCommand checking: '.
    my $ClientTypeMask = 0;       "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
    if($ClientOk) {      
       $ClientTypeMask  |= $CLIENT_OK;      if ($command eq "delete") {
    }   #
    if($ManagerOk) {   #   key with no newline.
       $ClientTypeMask  |= $MANAGER_OK;   #
    }   if( ($key eq "") || ($newline ne "")) {
          return 0; # Must have key but no newline.
    #  Enter the hash:   } else {
             return 1; # Valid syntax.
    my @entry = ($Procedure, $MustEncode, $ClientTypeMask);   }
          } elsif ($command eq "replace") {
    $Dispatcher{$RequestName} = \@entry;   #
       #   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, $editor) = @_;
   
       # Break the directive down into its command and its parameters
       # (at most two at this point.  The meaning of the parameters, if in fact
       #  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, $editor) = @_;
   
       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";
   }
   
   #---------------------------------------------------------------
   #
   # Manipulation of hash based databases (factoring out common code
   # for later use as we refactor.
   #
   #  Ties a domain level resource file to a hash.
   #  If requested a history entry is created in the associated hist file.
   #
   #  Parameters:
   #     domain    - Name of the domain in which the resource file lives.
   #     namespace - Name of the hash within that domain.
   #     how       - How to tie the hash (e.g. GDBM_WRCREAT()).
   #     loghead   - Optional parameter, if present a log entry is created
   #                 in the associated history file and this is the first part
   #                  of that entry.
   #     logtail   - Goes along with loghead,  The actual logentry is of the
   #                 form $loghead:<timestamp>:logtail.
   # Returns:
   #    Reference to a hash bound to the db file or alternatively undef
   #    if the tie failed.
   #
   sub tie_domain_hash {
       my ($domain,$namespace,$how,$loghead,$logtail) = @_;
       
       # Filter out any whitespace in the domain name:
       
       $domain =~ s/\W//g;
       
       # We have enough to go on to tie the hash:
       
       my $user_top_dir   = $perlvar{'lonUsersDir'};
       my $domain_dir     = $user_top_dir."/$domain";
       my $resource_file  = $domain_dir."/$namespace.db";
       my %hash;
       if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
    if (defined($loghead)) { # Need to log the operation.
       my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
       if($logFh) {
    my $timestamp = time;
    print $logFh "$loghead:$timestamp:$logtail\n";
       }
       $logFh->close;
    }
    return \%hash; # Return the tied hash.
       } else {
    return undef; # Tie failed.
       }
   }
   
   #
   #   Ties a user's resource file to a hash.  
   #   If necessary, an appropriate history
   #   log file entry is made as well.
   #   This sub factors out common code from the subs that manipulate
   #   the various gdbm files that keep keyword value pairs.
   # Parameters:
   #   domain       - Name of the domain the user is in.
   #   user         - Name of the 'current user'.
   #   namespace    - Namespace representing the file to tie.
   #   how          - What the tie is done to (e.g. GDBM_WRCREAT().
   #   loghead      - Optional first part of log entry if there may be a
   #                  history file.
   #   what         - Optional tail of log entry if there may be a history
   #                  file.
   # Returns:
   #   hash to which the database is tied.  It's up to the caller to untie.
   #   undef if the has could not be tied.
   #
   sub tie_user_hash {
       my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
   
       $namespace=~s/\//\_/g; # / -> _
       $namespace=~s/\W//g; # whitespace eliminated.
       my $proname     = propath($domain, $user);
         
       #  Tie the database.
       
       my %hash;
       if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
      $how, 0640)) {
    # If this is a namespace for which a history is kept,
    # make the history log entry:    
    if (($namespace =~/^nohist\_/) && (defined($loghead))) {
       my $args = scalar @_;
       Debug(" Opening history: $namespace $args");
       my $hfh = IO::File->new(">>$proname/$namespace.hist"); 
       if($hfh) {
    my $now = time;
    print $hfh "$loghead:$now:$what\n";
       }
       $hfh->close;
    }
    return \%hash;
       } else {
    return undef;
       }
       
 }  }
   
 #--------------------- Request Handlers --------------------------------------------  #--------------------- Request Handlers --------------------------------------------
 #  #
 #   By convention each request handler registers itself prior to the sub declaration:  #   By convention each request handler registers itself prior to the sub 
   #   declaration:
 #  #
   
   #++
   #
 #  Handles ping requests.  #  Handles ping requests.
 #  Parameters:  #  Parameters:
 #      $cmd    - the actual keyword that invoked us.  #      $cmd    - the actual keyword that invoked us.
Line 283  sub RegisterHandler { Line 1052  sub RegisterHandler {
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   
 sub PingHandler {  sub ping_handler {
    my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
    my $tail   = shift;      Debug("$cmd $tail $client .. $currenthostid:");
    my $client = shift;  
         
    Reply( $client,"$currenthostid\n","$cmd:$tail");      Reply( $client,"$currenthostid\n","$cmd:$tail");
         
    return 1;      return 1;
 }  }
 RegisterHandler("ping", \&PingHandler, 0, 1, 1);       # Ping unencoded, client or manager.  &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
   
   #++
   #
   # Handles pong requests.  Pong replies with our current host id, and
   #                         the results of a ping sent to us via our lonc.
 #  #
 # Handles pong reequests:  
 # Parameters:  # Parameters:
 #      $cmd    - the actual keyword that invoked us.  #      $cmd    - the actual keyword that invoked us.
 #      $tail   - the tail of the request that invoked us.  #      $tail   - the tail of the request that invoked us.
Line 308  RegisterHandler("ping", \&PingHandler, 0 Line 1080  RegisterHandler("ping", \&PingHandler, 0
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
   
 sub PongHandler {  sub pong_handler {
    my $cmd     = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail    = shift;  
    my $replyfd = shift;  
   
    my $reply=&reply("ping",$clientname);      my $reply=&reply("ping",$clientname);
    Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");       &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
    return 1;      return 1;
 }  }
 RegisterHandler("pong", \&PongHandler, 0, 1, 1);       # Pong unencoded, client or manager  &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
   
 #  #++
 #   EstablishKeyHandler:  
 #      Called to establish an encrypted session key with the remote client.  #      Called to establish an encrypted session key with the remote client.
 #  #      Note that with secure lond, in most cases this function is never
   #      invoked.  Instead, the secure session key is established either
   #      via a local file that's locked down tight and only lives for a short
   #      time, or via an ssl tunnel...and is generated from a bunch-o-random
   #      bits from /dev/urandom, rather than the predictable pattern used by
   #      by this sub.  This sub is only used in the old-style insecure
   #      key negotiation.
 # Parameters:  # Parameters:
 #      $cmd    - the actual keyword that invoked us.  #      $cmd    - the actual keyword that invoked us.
 #      $tail   - the tail of the request that invoked us.  #      $tail   - the tail of the request that invoked us.
Line 338  RegisterHandler("pong", \&PongHandler, 0 Line 1113  RegisterHandler("pong", \&PongHandler, 0
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
 #      $cipher is set with a reference to a new IDEA encryption object.  #      $cipher is set with a reference to a new IDEA encryption object.
 #  #
 sub EstablishKeyHandler {  sub establish_key_handler {
    my $cmd      = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail     = shift;  
    my $replyfd  = shift;      my $buildkey=time.$$.int(rand 100000);
       $buildkey=~tr/1-6/A-F/;
    my $buildkey=time.$$.int(rand 100000);      $buildkey=int(rand 100000).$buildkey.int(rand 100000);
    $buildkey=~tr/1-6/A-F/;      my $key=$currenthostid.$clientname;
    $buildkey=int(rand 100000).$buildkey.int(rand 100000);      $key=~tr/a-z/A-Z/;
    my $key=$currenthostid.$clientname;      $key=~tr/G-P/0-9/;
    $key=~tr/a-z/A-Z/;      $key=~tr/Q-Z/0-9/;
    $key=~tr/G-P/0-9/;      $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
    $key=~tr/Q-Z/0-9/;      $key=substr($key,0,32);
    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;      my $cipherkey=pack("H32",$key);
    $key=substr($key,0,32);      $cipher=new IDEA $cipherkey;
    my $cipherkey=pack("H32",$key);      &Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
    $cipher=new IDEA $cipherkey;  
    Reply($replyfd, "$buildkey\n", "$cmd:$tail");   
         
    return 1;      return 1;
   
 }  }
 RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1);  &register_handler("ekey", \&establish_key_handler, 0, 1,1);
   
   
 #  LoadHandler:  
 #     Handler for the load command.  Returns the current system load average  #     Handler for the load command.  Returns the current system load average
 #     to the requestor.  #     to the requestor.
 #  #
Line 378  RegisterHandler("ekey", \&EstablishKeyHa Line 1151  RegisterHandler("ekey", \&EstablishKeyHa
 #      0       - Program should exit.  #      0       - Program should exit.
 #  Side effects:  #  Side effects:
 #      Reply information is sent to the client.  #      Reply information is sent to the client.
 sub LoadHandler {  sub load_handler {
    my $cmd     = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail    = shift;  
    my $replyfd = shift;  
   
    # Get the load average from /proc/loadavg and calculate it as a percentage of     # 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     # the allowed load limit as set by the perl global variable lonLoadLim
   
    my $loadavg;      my $loadavg;
    my $loadfile=IO::File->new('/proc/loadavg');      my $loadfile=IO::File->new('/proc/loadavg');
         
    $loadavg=<$loadfile>;      $loadavg=<$loadfile>;
    $loadavg =~ s/\s.*//g;                       # Extract the first field only.      $loadavg =~ s/\s.*//g;                      # Extract the first field only.
         
    my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};      my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
   
    Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");      &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
         
    return 1;      return 1;
 }  }
 RegisterHandler("load", \&LoadHandler, 0, 1, 0);  register_handler("load", \&load_handler, 0, 1, 0);
   
   
 #  #
 #   Process the userload request.  This sub returns to the client the current  #   Process the userload request.  This sub returns to the client the current
Line 421  RegisterHandler("load", \&LoadHandler, 0 Line 1191  RegisterHandler("load", \&LoadHandler, 0
 #  Implicit outputs:  #  Implicit outputs:
 #     the reply is written to the client.  #     the reply is written to the client.
 #  #
 sub UserLoadHandler {  sub user_load_handler {
    my $cmd     = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail    = shift;  
    my $replyfd = shift;  
   
    my $userloadpercent=&userload();      my $userloadpercent=&userload();
    Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");      &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
       
    return 1;      return 1;
 }  }
 RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0);  register_handler("userload", \&user_load_handler, 0, 1, 0);
   
 #   Process a request for the authorization type of a user:  #   Process a request for the authorization type of a user:
 #   (userauth).  #   (userauth).
Line 446  RegisterHandler("userload", \&UserLoadHa Line 1214  RegisterHandler("userload", \&UserLoadHa
 # Implicit outputs:  # Implicit outputs:
 #    The user authorization type is written to the client.  #    The user authorization type is written to the client.
 #  #
 sub UserAuthorizationType {  sub user_authorization_type {
    my $cmd     = shift;      my ($cmd, $tail, $replyfd) = @_;
    my $tail    = shift;  
    my $replyfd = shift;  
         
    my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
         
    #  Pull the domain and username out of the command tail.      #  Pull the domain and username out of the command tail.
    # and call GetAuthType to determine the authentication type.      # and call get_auth_type to determine the authentication type.
         
    my ($udom,$uname)=split(/:/,$tail);      my ($udom,$uname)=split(/:/,$tail);
    my $result = GetAuthType($udom, $uname);      my $result = &get_auth_type($udom, $uname);
    if($result eq "nouser") {      if($result eq "nouser") {
       Failure( $replyfd, "unknown_user\n", $userinput);   &Failure( $replyfd, "unknown_user\n", $userinput);
    } else {      } else {
       Reply( $replyfd, "$result\n", $userinput);   #
    }   # We only want to pass the second field from get_auth_type
    # for ^krb.. otherwise we'll be handing out the encrypted
    # password for internals e.g.
    #
    my ($type,$otherinfo) = split(/:/,$result);
    if($type =~ /^krb/) {
       $type = $result;
    }
    &Reply( $replyfd, "$type:\n", $userinput);
       }
       
    return 1;      return 1;
 }  }
 RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0);  &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
 #  
 #   Process a request by a manager to push a hosts or domain table   #   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  #   to us.  We pick apart the command and pass it on to the subs
 #   that already exist to do this.  #   that already exist to do this.
Line 482  RegisterHandler("currentauth", \&UserAut Line 1257  RegisterHandler("currentauth", \&UserAut
 # Implicit Output:  # Implicit Output:
 #    a reply is written to the client.  #    a reply is written to the client.
   
 sub PushFileHandler {  sub push_file_handler {
    my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
    my $tail   = shift;  
    my $client = shift;      my $userinput = "$cmd:$tail";
   
    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
    # At this time we only know that the IP of our partner is a valid manager      # spoofing).
    # the code below is a hook to do further authentication (e.g. to resolve  
    # spoofing).  
   
    my $cert = GetCertificate($userinput);      my $cert = &GetCertificate($userinput);
    if(ValidManager($cert)) {       if(&ValidManager($cert)) { 
   
       # Now presumably we have the bona fides of both the peer host and the   # Now presumably we have the bona fides of both the peer host and the
       # process making the request.   # process making the request.
               
       my $reply = PushFile($userinput);   my $reply = &PushFile($userinput);
       Reply($client, "$reply\n", $userinput);   &Reply($client, "$reply\n", $userinput);
   
    } else {      } else {
       Failure( $client, "refused\n", $userinput);   &Failure( $client, "refused\n", $userinput);
    }       } 
       return 1;
 }  }
 RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1);  &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
   
   
   
Line 524  RegisterHandler("pushfile", \&PushFileHa Line 1298  RegisterHandler("pushfile", \&PushFileHa
 #  Implicit output:  #  Implicit output:
 #     a reply is sent to the client.  #     a reply is sent to the client.
 #  #
 sub ReinitProcessHandler {  sub reinit_process_handler {
    my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
    my $tail   = shift;  
    my $client = shift;  
         
    my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
         
    my $cert = GetCertificate($userinput);      my $cert = &GetCertificate($userinput);
    if(ValidManager($cert)) {      if(&ValidManager($cert)) {
       chomp($userinput);   chomp($userinput);
       my $reply = ReinitProcess($userinput);   my $reply = &ReinitProcess($userinput);
       Reply( $client,  "$reply\n", $userinput);   &Reply( $client,  "$reply\n", $userinput);
    } else {      } else {
       Failure( $client, "refused\n", $userinput);   &Failure( $client, "refused\n", $userinput);
  }      }
    return 1;      return 1;
 }  }
   
 RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1);  &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
   
 #  Process the editing script for a table edit operation.  #  Process the editing script for a table edit operation.
 #  the editing operation must be encrypted and requested by  #  the editing operation must be encrypted and requested by
Line 558  RegisterHandler("reinit", \&ReinitProces Line 1330  RegisterHandler("reinit", \&ReinitProces
 #  Implicit output:  #  Implicit output:
 #     a reply is sent to the client.  #     a reply is sent to the client.
 #  #
 sub EditTableHandler {  sub edit_table_handler {
    my $command    = shift;      my ($command, $tail, $client) = @_;
    my $tail       = shift;  
    my $client     = shift;  
         
    my $userinput = "$command:$tail";      my $userinput = "$command:$tail";
   
    my $cert = GetCertificate($userinput);      my $cert = &GetCertificate($userinput);
    if(ValidManager($cert)) {      if(&ValidManager($cert)) {
       my($filetype, $script) = split(/:/, $tail);   my($filetype, $script) = split(/:/, $tail);
       if (($filetype eq "hosts") ||    if (($filetype eq "hosts") || 
           ($filetype eq "domain")) {      ($filetype eq "domain")) {
          if($script ne "") {      if($script ne "") {
             Reply($client,            # BUGBUG - EditFile   &Reply($client,              # BUGBUG - EditFile
                   EditFile($userinput), #   could fail.        &EditFile($userinput), #   could fail.
                   $userinput);        $userinput);
          } else {      } else {
             Failure($client,"refused\n",$userinput);   &Failure($client,"refused\n",$userinput);
          }      }
       } else {   } else {
          Failure($client,"refused\n",$userinput);      &Failure($client,"refused\n",$userinput);
       }   }
    } else {      } else {
       Failure($client,"refused\n",$userinput);   &Failure($client,"refused\n",$userinput);
    }      }
    return 1;      return 1;
 }  }
 RegisterHandler("edit", \&EditTableHandler, 1, 0, 1);  register_handler("edit", \&edit_table_handler, 1, 0, 1);
   
   
 #  #
Line 598  RegisterHandler("edit", \&EditTableHandl Line 1368  RegisterHandler("edit", \&EditTableHandl
 #                internal per user password file.  #                internal per user password file.
 #   - kerberos - The user can be authenticated against either a kerb4 or kerb5  #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
 #                ticket granting authority.  #                ticket granting authority.
 #   - user     - The person tailoring LonCAPA can supply a user authentication mechanism  #   - user     - The person tailoring LonCAPA can supply a user authentication
 #                that is per system.  #                mechanism that is per system.
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
Line 612  RegisterHandler("edit", \&EditTableHandl Line 1382  RegisterHandler("edit", \&EditTableHandl
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 #  #
 sub AuthenticateHandler {  sub authenticate_handler {
    my $cmd        = shift;      my ($cmd, $tail, $client) = @_;
    my $tail       = shift;  
    my $client     = shift;  
      
    #  Regenerate the full input line   
      
    my $userinput  = $cmd.":".$tail;  
   
    #  udom    - User's domain.      
    #  uname   - Username.      #  Regenerate the full input line 
    #  upass   - User's password.      
          my $userinput  = $cmd.":".$tail;
    my ($udom,$uname,$upass)=split(/:/,$tail);      
    Debug(" Authenticate domain = $udom, user = $uname, password = $upass");      #  udom    - User's domain.
    chomp($upass);      #  uname   - Username.
    $upass=unescape($upass);      #  upass   - User's password.
    my $proname=propath($udom,$uname);      
    my $passfilename="$proname/passwd";      my ($udom,$uname,$upass)=split(/:/,$tail);
          &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
    #   The user's 'personal' loncapa passworrd file describes how to authenticate:      chomp($upass);
          $upass=&unescape($upass);
    if (-e $passfilename) {  
      Debug("Located password file: $passfilename");      my $pwdcorrect = &validate_user($udom, $uname, $upass);
       if($pwdcorrect) {
    &Reply( $client, "authorized\n", $userinput);
    #
    #  Bad credentials: Failed to authorize
    #
       } else {
    &Failure( $client, "non_authorized\n", $userinput);
       }
   
       my $pf = IO::File->new($passfilename);      return 1;
       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);  
   register_handler("auth", \&authenticate_handler, 1, 1, 0);
   
 #  #
 #   Change a user's password.  Note that this function is complicated by  #   Change a user's password.  Note that this function is complicated by
Line 764  RegisterHandler("auth", \&AuthenticateHa Line 1435  RegisterHandler("auth", \&AuthenticateHa
 # Implicit inputs:  # Implicit inputs:
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 sub ChangePasswordHandler {  sub change_password_handler {
    my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
    my $tail    = shift;  
    my $client  = shift;  
      
    my $userinput = $cmd.":".$tail;           # Reconstruct client's string.  
   
    #      my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
    #  udom  - user's domain.  
    #  uname - Username.      #
    #  upass - Current password.      #  udom  - user's domain.
    #  npass - New password.      #  uname - Username.
          #  upass - Current password.
    my ($udom,$uname,$upass,$npass)=split(/:/,$tail);      #  npass - New password.
    chomp($npass);     
    $upass=&unescape($upass);      my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
    $npass=&unescape($npass);  
    &Debug("Trying to change password for $uname");      $upass=&unescape($upass);
    my $proname=propath($udom,$uname);      $npass=&unescape($npass);
    my $passfilename="$proname/passwd";      &Debug("Trying to change password for $uname");
    if (-e $passfilename) {  
       my $realpasswd;      # First require that the user can be authenticated with their
       {       # old password:
          my $pf = IO::File->new($passfilename);  
          $realpasswd=<$pf>;       my $validated = &validate_user($udom, $uname, $upass);
       }      if($validated) {
       chomp($realpasswd);   my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
       if ($howpwd eq 'internal') {   my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
          &Debug("internal auth");   if ($howpwd eq 'internal') {
          if (crypt($upass,$contentpwd) eq $contentpwd) {      &Debug("internal auth");
             my $salt=time;      my $salt=time;
             $salt=substr($salt,6,2);      $salt=substr($salt,6,2);
             my $ncpass=crypt($npass,$salt);      my $ncpass=crypt($npass,$salt);
                {      if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
                   my $pf = IO::File->new(">$passfilename");   &logthis("Result of password change for "
                   if ($pf) {   ."$uname: pwchange_success");
                      print $pf "internal:$ncpass\n";   &Reply($client, "ok\n", $userinput);
                      &logthis("Result of password change for "      } else {
                               ."$uname: pwchange_success");   &logthis("Unable to open $uname passwd "               
                      Reply($client, "ok\n", $userinput);   ."to change password");
                   } else {   &Failure( $client, "non_authorized\n",$userinput);
                      &logthis("Unable to open $uname passwd "                     }
                               ."to change password");   } elsif ($howpwd eq 'unix') {
                      Failure( $client, "non_authorized\n",$userinput);      # Unix means we have to access /etc/password
                   }      &Debug("auth is unix");
                }                   my $execdir=$perlvar{'lonDaemons'};
          } else {      &Debug("Opening lcpasswd pipeline");
             Failure($client, "non_authorized\n", $userinput);      my $pf = IO::File->new("|$execdir/lcpasswd > "
          }     ."$perlvar{'lonDaemons'}"
       } elsif ($howpwd eq 'unix') {     ."/logs/lcpasswd.log");
          # Unix means we have to access /etc/password      print $pf "$uname\n$npass\n$npass\n";
          # one way or another.      close $pf;
          # First: Make sure the current password is      my $err = $?;
          #        correct      my $result = ($err>0 ? 'pwchange_failure' : 'ok');
          &Debug("auth is unix");      &logthis("Result of password change for $uname: ".
          $contentpwd=(getpwnam($uname))[1];       &lcpasswdstrerror($?));
          my $pwdcorrect = "0";      &Reply($client, "$result\n", $userinput);
          my $pwauth_path="/usr/local/sbin/pwauth";   } else {
          unless ($contentpwd eq 'x') {      # this just means that the current password mode is not
             $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);      # one we know how to change (e.g the kerberos auth modes or
          } elsif (-e $pwauth_path) {      # locally written auth handler).
             open PWAUTH, "|$pwauth_path" or      #
                die "Cannot invoke authentication";      &Failure( $client, "auth_mode_error\n", $userinput);
             print PWAUTH "$uname\n$upass\n";   }  
             close PWAUTH;  
             &Debug("exited pwauth with $? ($uname,$upass) ");      } else {
             $pwdcorrect=($? == 0);   &Failure( $client, "non_authorized\n", $userinput);
          }      }
          if ($pwdcorrect) {  
             my $execdir=$perlvar{'lonDaemons'};      return 1;
             &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);  register_handler("passwd", \&change_password_handler, 1, 1, 0);
   
   
 #  #
 #   Create a new user.  User in this case means a lon-capa user.  #   Create a new user.  User in this case means a lon-capa user.
Line 875  RegisterHandler("passwd", \&ChangePasswo Line 1522  RegisterHandler("passwd", \&ChangePasswo
 # Implicit inputs:  # Implicit inputs:
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 sub AddUserHandler {  sub add_user_handler {
    my $cmd     = shift;  
    my $tail    = shift;  
    my $client  = shift;  
      
    my $userinput = $cmd.":".$tail;     
   
    my $oldumask=umask(0077);      my ($cmd, $tail, $client) = @_;
    my ($udom,$uname,$umode,$npass)=split(/:/,$tail);  
    &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);  
    chomp($npass);      my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
    $npass=&unescape($npass);      my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
    my $proname=propath($udom,$uname);  
    my $passfilename="$proname/passwd";      &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
    &Debug("Password file created will be:".$passfilename);  
    if (-e $passfilename) {  
       Failure( $client, "already_exists\n", $userinput);      if($udom eq $currentdomainid) { # Reject new users for other domains...
    } elsif ($udom ne $currentdomainid) {  
       Failure($client, "not_right_domain\n", $userinput);   my $oldumask=umask(0077);
    } else {   chomp($npass);
       my @fpparts=split(/\//,$proname);   $npass=&unescape($npass);
       my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];   my $passfilename  = &password_path($udom, $uname);
       my $fperror='';   &Debug("Password file created will be:".$passfilename);
       for (my $i=3;$i<=$#fpparts;$i++) {   if (-e $passfilename) {
          $fpnow.='/'.$fpparts[$i];       &Failure( $client, "already_exists\n", $userinput);
          unless (-e $fpnow) {   } else {
             unless (mkdir($fpnow,0777)) {      my @fpparts=split(/\//,$passfilename);
                $fperror="error: ".($!+0)." mkdir failed while attempting "      my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
                        ."makeuser";      my $fperror='';
             }      for (my $i=3;$i<= ($#fpparts-1);$i++) {
          }   $fpnow.='/'.$fpparts[$i]; 
       }   unless (-e $fpnow) {
       unless ($fperror) {      &logthis("mkdir $fpnow");
          my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);      unless (mkdir($fpnow,0777)) {
          Reply($client, $result, $userinput);     #BUGBUG - could be fail   $fperror="error: ".($!+0)." mkdir failed while attempting "
       } else {      ."makeuser";
          Failure($client, "$fperror\n", $userinput);      }
       }   }
    }      }
    umask($oldumask);      unless ($fperror) {
    return 1;   my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
    &Reply($client, $result, $userinput);     #BUGBUG - could be fail
       } else {
    &Failure($client, "$fperror\n", $userinput);
       }
    }
    umask($oldumask);
       }  else {
    &Failure($client, "not_right_domain\n",
    $userinput); # Even if we are multihomed.
       
       }
       return 1;
   
 }  }
 RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);  &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
   
 #  #
 #   Change the authentication method of a user.  Note that this may  #   Change the authentication method of a user.  Note that this may
Line 942  RegisterHandler("makeuser", \&AddUserHan Line 1596  RegisterHandler("makeuser", \&AddUserHan
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 #  #
 sub ChangeAuthenticationHandler {  sub change_authentication_handler {
    my $cmd     = shift;  
    my $tail    = shift;      my ($cmd, $tail, $client) = @_;
    my $client  = shift;  
         
    my $userinput  = "$cmd:$tail";              # Reconstruct user input.      my $userinput  = "$cmd:$tail";              # Reconstruct user input.
   
    my ($udom,$uname,$umode,$npass)=split(/:/,$tail);      my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
    chomp($npass);      &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
    &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);      if ($udom ne $currentdomainid) {
    $npass=&unescape($npass);   &Failure( $client, "not_right_domain\n", $client);
    my $proname=&propath($udom,$uname);      } else {
    my $passfilename="$proname/passwd";  
    if ($udom ne $currentdomainid) {   chomp($npass);
       Failure( $client, "not_right_domain\n", $client);  
    } else {   $npass=&unescape($npass);
       my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);   my $passfilename = &password_path($udom, $uname);
       Reply($client, $result, $userinput);   if ($passfilename) { # Not allowed to create a new user!!
    }      my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
    return 1;      &Reply($client, $result, $userinput);
    } else {       
       &Failure($client, "non_authorized", $userinput); # Fail the user now.
    }
       }
       return 1;
 }  }
 RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);  &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
   
 #  #
 #   Determines if this is the home server for a user.  The home server  #   Determines if this is the home server for a user.  The home server
Line 981  RegisterHandler("changeuserauth", \&Chan Line 1639  RegisterHandler("changeuserauth", \&Chan
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 #  #
 sub IsHomeHandler {  sub is_home_handler {
    my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
    my $tail    = shift;  
    my $client  = shift;  
         
    my $userinput  = "$cmd:$tail";      my $userinput  = "$cmd:$tail";
         
    my ($udom,$uname)=split(/:/,$tail);      my ($udom,$uname)=split(/:/,$tail);
    chomp($uname);      chomp($uname);
    my $proname=propath($udom,$uname);      my $passfile = &password_filename($udom, $uname);
    if (-e $proname) {      if($passfile) {
       Reply( $client, "found\n", $userinput);   &Reply( $client, "found\n", $userinput);
    } else {      } else {
       Failure($client, "not_found\n", $userinput);   &Failure($client, "not_found\n", $userinput);
    }      }
    return 1;      return 1;
 }  }
 RegisterHandler("home", \&IsHomeHandler, 0,1,0);  &register_handler("home", \&is_home_handler, 0,1,0);
   
 #  #
 #   Process an update request for a resource?? I think what's going on here is  #   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.  #   that a resource has been modified that we hold a subscription to.
Line 1021  RegisterHandler("home", \&IsHomeHandler, Line 1678  RegisterHandler("home", \&IsHomeHandler,
 #    The authentication systems describe above have their own forms of implicit  #    The authentication systems describe above have their own forms of implicit
 #    input into the authentication process that are described above.  #    input into the authentication process that are described above.
 #  #
 sub UpdateResourceHandler {  sub update_resource_handler {
    my $cmd    = shift;  
    my $tail   = shift;      my ($cmd, $tail, $client) = @_;
    my $client = shift;  
         
    my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
         
    my $fname=$tail;      my $fname= $tail; # This allows interactive testing
    my $ownership=ishome($fname);  
    if ($ownership eq 'not_owner') {  
       if (-e $fname) {      my $ownership=ishome($fname);
          my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,      if ($ownership eq 'not_owner') {
              $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);   if (-e $fname) {
          my $now=time;      my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
          my $since=$now-$atime;   $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
          if ($since>$perlvar{'lonExpire'}) {      my $now=time;
             my $reply=&reply("unsub:$fname","$clientname");      my $since=$now-$atime;
             unlink("$fname");      if ($since>$perlvar{'lonExpire'}) {
          } else {   my $reply=&reply("unsub:$fname","$clientname");
             my $transname="$fname.in.transfer";   unlink("$fname");
             my $remoteurl=&reply("sub:$fname","$clientname");      } else {
             my $response;   my $transname="$fname.in.transfer";
             alarm(120);   my $remoteurl=&reply("sub:$fname","$clientname");
             {   my $response;
                my $ua=new LWP::UserAgent;   alarm(120);
                my $request=new HTTP::Request('GET',"$remoteurl");   {
                $response=$ua->request($request,$transname);      my $ua=new LWP::UserAgent;
             }      my $request=new HTTP::Request('GET',"$remoteurl");
             alarm(0);      $response=$ua->request($request,$transname);
             if ($response->is_error()) {   }
                unlink($transname);   alarm(0);
                my $message=$response->status_line;   if ($response->is_error()) {
                &logthis("LWP GET: $message for $fname ($remoteurl)");      unlink($transname);
             } else {      my $message=$response->status_line;
                if ($remoteurl!~/\.meta$/) {      &logthis("LWP GET: $message for $fname ($remoteurl)");
                   alarm(120);   } else {
                   {      if ($remoteurl!~/\.meta$/) {
                      my $ua=new LWP::UserAgent;   alarm(120);
                      my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');   {
                      my $mresponse=$ua->request($mrequest,$fname.'.meta');      my $ua=new LWP::UserAgent;
                      if ($mresponse->is_error()) {      my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
                         unlink($fname.'.meta');      my $mresponse=$ua->request($mrequest,$fname.'.meta');
                      }      if ($mresponse->is_error()) {
                   }   unlink($fname.'.meta');
                   alarm(0);      }
                }   }
                rename($transname,$fname);   alarm(0);
             }      }
          }      rename($transname,$fname);
                Reply( $client, "ok\n", $userinput);   }
       } else {      }
          Failure($client, "not_found\n", $userinput);      &Reply( $client, "ok\n", $userinput);
       }   } else {
    } else {      &Failure($client, "not_found\n", $userinput);
       Failure($client, "rejected\n", $userinput);   }
    }      } else {
    return 1;   &Failure($client, "rejected\n", $userinput);
       }
       return 1;
 }  }
 RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);  &register_handler("update", \&update_resource_handler, 0 ,1, 0);
   
 #  #
 #   Fetch a user file from a remote server:  #   Fetch a user file from a remote server to the user's home directory
   #   userfiles subdir.
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
 #    $tail     - Tail of the command (remaining parameters).  #    $tail     - Tail of the command (remaining parameters).
Line 1091  RegisterHandler("update", \&UpdateResour Line 1750  RegisterHandler("update", \&UpdateResour
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub FetchUserFileHandler {  sub fetch_user_file_handler {
    my $cmd     = shift;  
    my $tail    = shift;      my ($cmd, $tail, $client) = @_;
    my $client  = shift;  
          my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";      my $fname           = $tail;
    my $fname           = $tail;      my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
    my ($udom,$uname,$ufile)=split(/\//,$fname);      my $udir=&propath($udom,$uname).'/userfiles';
    my $udir=propath($udom,$uname).'/userfiles';      unless (-e $udir) {
    unless (-e $udir) {   mkdir($udir,0770); 
       mkdir($udir,0770);       }
    }      Debug("fetch user file for $fname");
    if (-e $udir) {      if (-e $udir) {
       $ufile=~s/^[\.\~]+//;   $ufile=~s/^[\.\~]+//;
       $ufile=~s/\///g;  
       my $destname=$udir.'/'.$ufile;   # IF necessary, create the path right down to the file.
       my $transname=$udir.'/'.$ufile.'.in.transit';   # Note that any regular files in the way of this path are
       my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;   # wiped out to deal with some earlier folly of mine.
       my $response;  
       alarm(120);   my $path = $udir;
       {   if ($ufile =~m|(.+)/([^/]+)$|) {
          my $ua=new LWP::UserAgent;      my @parts=split('/',$1);
          my $request=new HTTP::Request('GET',"$remoteurl");      foreach my $part (@parts) {
          $response=$ua->request($request,$transname);   $path .= '/'.$part;
       }   if( -f $path) {
       alarm(0);      unlink($path);
       if ($response->is_error()) {   }
          unlink($transname);   if ((-e $path)!=1) {
          my $message=$response->status_line;      mkdir($path,0770);
          &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);   my $destname=$udir.'/'.$ufile;
             Failure($client, "failed\n", $userinput);   my $transname=$udir.'/'.$ufile.'.in.transit';
          } else {   my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
             Reply($client, "ok\n", $userinput);   my $response;
          }   Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
       }      alarm(120);
    } else {   {
       Failure($client, "not_home\n", $userinput);      my $ua=new LWP::UserAgent;
    }      my $request=new HTTP::Request('GET',"$remoteurl");
    return 1;      $response=$ua->request($request,$transname);
    }
    alarm(0);
    if ($response->is_error()) {
       unlink($transname);
       my $message=$response->status_line;
       &logthis("LWP GET: $message for $fname ($remoteurl)");
       &Failure($client, "failed\n", $userinput);
    } else {
       Debug("Renaming $transname to $destname");
       if (!rename($transname,$destname)) {
    &logthis("Unable to move $transname to $destname");
    unlink($transname);
    &Failure($client, "failed\n", $userinput);
       } else {
    &Reply($client, "ok\n", $userinput);
       }
    }   
       } else {
    &Failure($client, "not_home\n", $userinput);
       }
       return 1;
   }
   &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
   
   #
   #   Remove a file from a user's home directory userfiles subdirectory.
   # Parameters:
   #    cmd   - the Lond request keyword that got us here.
   #    tail  - the part of the command past the keyword.
   #    client- File descriptor connected with the client.
   #
   # Returns:
   #    1    - Continue processing.
   
   sub remove_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
   
       my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
       if ($ufile =~m|/\.\./|) {
    # any files paths with /../ in them refuse 
    # to deal with
    &Failure($client, "refused\n", "$cmd:$tail");
       } else {
    my $udir = &propath($udom,$uname);
    if (-e $udir) {
       my $file=$udir.'/userfiles/'.$ufile;
       if (-e $file) {
    unlink($file);
    if (-e $file) {
       &Failure($client, "failed\n", "$cmd:$tail");
    } else {
       &Reply($client, "ok\n", "$cmd:$tail");
    }
       } else {
    &Failure($client, "not_found\n", "$cmd:$tail");
       }
    } else {
       &Failure($client, "not_home\n", "$cmd:$tail");
    }
       }
       return 1;
 }  }
 RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);  &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
   
   
 #  #
 #   Authenticate access to a user file.  Question?   The token for athentication  #  Authenticate access to a user file by checking the user's 
 #   is allowed to be sent as cleartext is this really what we want?  This token  #  session token(?)
 #   represents the user's session id.  Once it is forged does this allow too much access??  
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #   cmd      - The request keyword that dispatched to tus.
 #    $tail     - Tail of the command (remaining parameters).  #   tail     - The tail of the request (colon separated parameters).
 #    $client   - File descriptor connected to client.  #   client   - Filehandle open on the client.
 # Returns  # Return:
 #     0        - Requested to exit, caller should shut down.  #    1.
 #     1        - Continue processing.  
 sub AuthenticateUserFileAccess {  sub token_auth_user_file_handler {
    my $cmd   = shift;      my ($cmd, $tail, $client) = @_;
    my $tail    = shift;  
    my $client = shift;      my ($fname, $session) = split(/:/, $tail);
    my $userinput = "$cmd:$tail";      
       chomp($session);
    my ($fname,$session)=split(/:/,$tail);      my $reply='non_auth';
    chomp($session);      if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
    my $reply='non_auth';       $session.'.id')) {
    if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {   while (my $line=<ENVIN>) {
       while (my $line=<ENVIN>) {      if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
          if ($line=~/userfile\.$fname\=/) {    }
             $reply='ok';    close(ENVIN);
          }   &Reply($client, $reply);
       }      } else {
       close(ENVIN);   &Failure($client, "invalid_token\n", "$cmd:$tail");
       Reply($client, $reply."\n", $userinput);      }
    } else {      return 1;
       Failure($client, "invalid_token\n", $userinput);  
    }  
    return 1;  
      
 }  }
 RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);  
   &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
   
   
 #  #
 #   Unsubscribe from a resource.  #   Unsubscribe from a resource.
 #  #
Line 1184  RegisterHandler("tokenauthuserfile", \&A Line 1907  RegisterHandler("tokenauthuserfile", \&A
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub UnsubscribeHandler {  sub unsubscribe_handler {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;      my $userinput= "$cmd:$tail";
    my $userinput= "$cmd:$tail";      
       my ($fname) = split(/:/,$tail); # Split in case there's extrs.
    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.      &Debug("Unsubscribing $fname");
       if (-e $fname) {
    &Debug("Exists");
    &Reply($client, &unsub($fname,$clientip), $userinput);
       } else {
    &Failure($client, "not_found\n", $userinput);
       }
       return 1;
   }
   &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
   #   Subscribe to a resource
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    $cmd      - The command that got us here.
Line 1210  RegisterHandler("unusb", \&UnsubscribeHa Line 1934  RegisterHandler("unusb", \&UnsubscribeHa
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub SubscribeHandler {  sub subscribe_handler {
    my $cmd        = shift;      my ($cmd, $tail, $client)= @_;
    my $tail       = shift;  
    my $client     = shift;  
    my $userinput  = "$cmd:$tail";  
   
    Reply( $client, &subscribe($userinput,$clientip), $userinput);      my $userinput  = "$cmd:$tail";
    
    return 1;      &Reply( $client, &subscribe($userinput,$clientip), $userinput);
   
       return 1;
 }  }
 RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);  &register_handler("sub", \&subscribe_handler, 0, 1, 0);
   
 #  #
 #   Determine the version of a resource (?) Or is it return  #   Determine the version of a resource (?) Or is it return
Line 1235  RegisterHandler("sub", \&SubscribeHandle Line 1958  RegisterHandler("sub", \&SubscribeHandle
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub CurrentVersionHandler {  sub current_version_handler {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;      my $userinput= "$cmd:$tail";
    my $userinput= "$cmd:$tail";  
         
    my $fname   = $tail;      my $fname   = $tail;
    Reply( $client, &currentversion($fname)."\n", $userinput);      &Reply( $client, &currentversion($fname)."\n", $userinput);
    return 1;      return 1;
   
 }  }
 RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);  &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
   
   
 #  Make an entry in a user's activity log.  #  Make an entry in a user's activity log.
 #  #
Line 1259  RegisterHandler("currentversion", \&Curr Line 1980  RegisterHandler("currentversion", \&Curr
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub ActivityLogEntryHandler {  sub activity_log_handler {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;  
    my $userinput= "$cmd:$tail";      my $userinput= "$cmd:$tail";
   
    my ($udom,$uname,$what)=split(/:/,$tail);      my ($udom,$uname,$what)=split(/:/,$tail);
    chomp($what);      chomp($what);
    my $proname=propath($udom,$uname);      my $proname=&propath($udom,$uname);
    my $now=time;      my $now=time;
    my $hfh;      my $hfh;
    if ($hfh=IO::File->new(">>$proname/activity.log")) {       if ($hfh=IO::File->new(">>$proname/activity.log")) { 
       print $hfh "$now:$clientname:$what\n";   print $hfh "$now:$clientname:$what\n";
       Reply( $client, "ok\n", $userinput);    &Reply( $client, "ok\n", $userinput); 
    } else {      } else {
       Reply($client, "error: ".($!+0)." IO::File->new Failed "   &Failure($client, "error: ".($!+0)." IO::File->new Failed "
             ."while attempting log\n",    ."while attempting log\n", 
             $userinput);   $userinput);
    }      }
   
    return 1;      return 1;
 }  }
 RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);  register_handler("log", \&activity_log_handler, 0, 1, 0);
   
 #  #
 #   Put a namespace entry in a user profile hash.  #   Put a namespace entry in a user profile hash.
 #   My druthers would be for this to be an encrypted interaction too.  #   My druthers would be for this to be an encrypted interaction too.
Line 1296  RegisterHandler("log", \&ActivityLogEntr Line 2018  RegisterHandler("log", \&ActivityLogEntr
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub PutUserProfileEntry {  sub put_user_profile_entry {
    my $cmd       = shift;      my ($cmd, $tail, $client)  = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";      
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
    my ($udom,$uname,$namespace,$what) =split(/:/,$tail);      if ($namespace ne 'roles') {
    $namespace=~s/\//\_/g;   chomp($what);
    $namespace=~s/\W//g;   my $hashref = &tie_user_hash($udom, $uname, $namespace,
    if ($namespace ne 'roles') {    &GDBM_WRCREAT(),"P",$what);
       chomp($what);   if($hashref) {
       my $proname=propath($udom,$uname);      my @pairs=split(/\&/,$what);
       my $now=time;      foreach my $pair (@pairs) {
       unless ($namespace=~/^nohist\_/) {   my ($key,$value)=split(/=/,$pair);
          my $hfh;   $hashref->{$key}=$value;
          if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {       }
             print $hfh "P:$now:$what\n";       if (untie(%$hashref)) {
          }   &Reply( $client, "ok\n", $userinput);
       }      } else {
       my @pairs=split(/\&/,$what);   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
       my %hash;   "while attempting put\n", 
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",   $userinput);
                   &GDBM_WRCREAT(),0640)) {      }
          foreach my $pair (@pairs) {   } else {
             my ($key,$value)=split(/=/,$pair);      &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
             $hash{$key}=$value;       "while attempting put\n", $userinput);
          }   }
          if (untie(%hash)) {      } else {
             Reply( $client, "ok\n", $userinput);          &Failure( $client, "refused\n", $userinput);
          } else {      }
             Failure($client, "error: ".($!+0)." untie(GDBM) failed ".      
                   "while attempting put\n",       return 1;
                   $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);  &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
   
 #   # 
 #   Increment a profile entry in the user history file.  #   Increment a profile entry in the user history file.
Line 1357  RegisterHandler("put", \&PutUserProfileE Line 2068  RegisterHandler("put", \&PutUserProfileE
 #     0        - Requested to exit, caller should shut down.  #     0        - Requested to exit, caller should shut down.
 #     1        - Continue processing.  #     1        - Continue processing.
 #  #
 sub IncrementUserValueHandler {  sub increment_user_value_handler {
    my $cmd         = shift;      my ($cmd, $tail, $client) = @_;
    my $tail        = shift;      
    my $client      = shift;      my $userinput   = "$cmd:$tail";
    my $userinput   = shift;      
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
    my ($udom,$uname,$namespace,$what) =split(/:/,$tail);      if ($namespace ne 'roles') {
    $namespace=~s/\//\_/g;          chomp($what);
    $namespace=~s/\W//g;   my $hashref = &tie_user_hash($udom, $uname,
    if ($namespace ne 'roles') {       $namespace, &GDBM_WRCREAT(),
       chomp($what);       "P",$what);
       my $proname=propath($udom,$uname);   if ($hashref) {
       my $now=time;      my @pairs=split(/\&/,$what);
       unless ($namespace=~/^nohist\_/) {      foreach my $pair (@pairs) {
          my $hfh;   my ($key,$value)=split(/=/,$pair);
          if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {    # We could check that we have a number...
             print $hfh "P:$now:$what\n";   if (! defined($value) || $value eq '') {
          }      $value = 1;
       }   }
       my @pairs=split(/\&/,$what);   $hashref->{$key}+=$value;
       my %hash;      }
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),      if (untie(%$hashref)) {
                0640)) {   &Reply( $client, "ok\n", $userinput);
          foreach my $pair (@pairs) {      } else {
             my ($key,$value)=split(/=/,$pair);   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
             # We could check that we have a number...   "while attempting inc\n", $userinput);
             if (! defined($value) || $value eq '') {      }
                $value = 1;   } else {
             }      &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
             $hash{$key}+=$value;       "while attempting inc\n", $userinput);
          }   }
          if (untie(%hash)) {      } else {
             Reply( $client, "ok\n", $userinput);   &Failure($client, "refused\n", $userinput);
          } else {      }
             Failure($client, "error: ".($!+0)." untie(GDBM) failed ".      
                      "while attempting put\n", $userinput);      return 1;
          }  
       } else {  
          Failure($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);  &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
   
   
 #  #
 #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.  #   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  #   Each 'role' a user has implies a set of permissions.  Adding a new role
Line 1425  RegisterHandler("inc", \&IncrementUserVa Line 2128  RegisterHandler("inc", \&IncrementUserVa
 #     1         - To continue processing.  #     1         - To continue processing.
 #  #
 #  #
 sub RolesPutHandler {  sub roles_put_handler {
    my $cmd        = shift;      my ($cmd, $tail, $client) = @_;
    my $tail       = shift;  
    my $client     = shift;      my $userinput  = "$cmd:$tail";
    my $userinput  = "$cmd:$tail";  
          my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
    my ($exedom,$exeuser,$udom,$uname,$what)   =split(/:/,$tail);      
    &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.  
           "what = ".$what);      my $namespace='roles';
    my $namespace='roles';      chomp($what);
    chomp($what);      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    my $proname=propath($udom,$uname);   &GDBM_WRCREAT(), "P",
    my $now=time;   "$exedom:$exeuser:$what");
    #      #
    #  Log the attempt to set a role.  The {}'s here ensure that the file       #  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      #  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-      #  is done on close this improves the chances the log will be an un-
    #  corrupted ordered thing.      #  corrupted ordered thing.
    {      if ($hashref) {
       my $hfh;   my @pairs=split(/\&/,$what);
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {    foreach my $pair (@pairs) {
          print $hfh "P:$now:$exedom:$exeuser:$what\n";      my ($key,$value)=split(/=/,$pair);
       }      &manage_permissions($key, $udom, $uname,
    }         &get_auth_type( $udom, $uname));
    my @pairs=split(/\&/,$what);      $hashref->{$key}=$value;
    my %hash;   }
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {   if (untie($hashref)) {
       foreach my $pair (@pairs) {      &Reply($client, "ok\n", $userinput);
          my ($key,$value)=split(/=/,$pair);   } else {
             &ManagePermissions($key, $udom, $uname,      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                                &GetAuthType( $udom, $uname));       "while attempting rolesput\n", $userinput);
             $hash{$key}=$value;   }
       }      } else {
       if (untie(%hash)) {   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
          Reply($client, "ok\n", $userinput);   "while attempting rolesput\n", $userinput);
       } else {      }
          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      return 1;
                          "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.  &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
   
 #  #
 #   Deletes (removes) a role for a user.   This is equivalent to removing  #   Deletes (removes) a role for a user.   This is equivalent to removing
 #  a permissions package associated with the role from the user's profile.  #  a permissions package associated with the role from the user's profile.
Line 1488  RegisterHandler("rolesput", \&RolesPutHa Line 2185  RegisterHandler("rolesput", \&RolesPutHa
 #     1                    - Continue processing  #     1                    - Continue processing
 #     0                    - Exit.  #     0                    - Exit.
 #  #
 sub RolesDeleteHandler {  sub roles_delete_handler {
    my $cmd          = shift;      my ($cmd, $tail, $client)  = @_;
    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;      my $userinput    = "$cmd:$tail";
      
       my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
       &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
      "what = ".$what);
       my $namespace='roles';
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_WRCREAT(), "D",
    "$exedom:$exeuser:$what");
       
       if ($hashref) {
    my @rolekeys=split(/\&/,$what);
   
    foreach my $key (@rolekeys) {
       delete $hashref->{$key};
    }
    if (untie(%$hashref)) {
       &Reply($client, "ok\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting rolesdel\n", $userinput);
    }
       } else {
           &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting rolesdel\n", $userinput);
       }
       
       return 1;
 }  }
 RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only  &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
   
 # Unencrypted get from a user's profile database.  See   # Unencrypted get from a user's profile database.  See 
 # GetProfileEntryEncrypted for a version that does end-to-end encryption.  # GetProfileEntryEncrypted for a version that does end-to-end encryption.
Line 1553  RegisterHandler("rolesdel", \&RolesDelet Line 2239  RegisterHandler("rolesdel", \&RolesDelet
 #   1       - Continue processing.  #   1       - Continue processing.
 #   0       - Exit.  #   0       - Exit.
 #  #
 sub GetProfileEntry {  sub get_profile_entry {
    my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
    my $tail     = shift;  
    my $client   = shift;      my $userinput= "$cmd:$tail";
    my $userinput= "$cmd:$tail";  
         
    my ($udom,$uname,$namespace,$what) = split(/:/,$tail);      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
    $namespace=~s/\//\_/g;      chomp($what);
    $namespace=~s/\W//g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    chomp($what);   &GDBM_READER());
    my @queries=split(/\&/,$what);      if ($hashref) {
    my $proname=propath($udom,$uname);          my @queries=split(/\&/,$what);
    my $qresult='';          my $qresult='';
    my %hash;  
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {   for (my $i=0;$i<=$#queries;$i++) {
       for (my $i=0;$i<=$#queries;$i++) {      $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
          $qresult.="$hash{$queries[$i]}&";    # Presumably failure gives empty string.   }
       }   $qresult=~s/\&$//;              # Remove trailing & from last lookup.
       if (untie(%hash)) {   if (untie(%$hashref)) {
          $qresult=~s/\&$//;              # Remove trailing & from last lookup.      &Reply($client, "$qresult\n", $userinput);
          Reply($client, "$qresult\n", $userinput);   } else {
       } else {      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      "while attempting get\n", $userinput);
                           "while attempting get\n", $userinput);   }
       }      } else {
    } else {   if ($!+0 == 2) {               # +0 coerces errno -> number 2 is ENOENT
       if ($!+0 == 2) {                # +0 coerces errno -> number 2 is ENOENT      &Failure($client, "error:No such file or ".
          Failure($client, "error:No such file or ".      "GDBM reported bad block error\n", $userinput);
                           "GDBM reported bad block error\n", $userinput);   } else {                        # Some other undifferentiated err.
       } else {                        # Some other undifferentiated err.      &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
          Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      "while attempting get\n", $userinput);
                            "while attempting get\n", $userinput);   }
       }      }
    }      return 1;
    return 1;  
 }  }
 RegisterHandler("get", \&GetProfileEntry, 0,1,0);  &register_handler("get", \&get_profile_entry, 0,1,0);
   
 #  #
 #  Process the encrypted get request.  Note that the request is sent  #  Process the encrypted get request.  Note that the request is sent
 #  in clear, but the reply is encrypted.  This is a small covert channel:  #  in clear, but the reply is encrypted.  This is a small covert channel:
Line 1609  RegisterHandler("get", \&GetProfileEntry Line 2294  RegisterHandler("get", \&GetProfileEntry
 #  Returns:  #  Returns:
 #     1      - Continue processing  #     1      - Continue processing
 #     0      - server should exit.  #     0      - server should exit.
 sub GetProfileEntryEncrypted {  sub get_profile_entry_encrypted {
    my $cmd       = shift;      my ($cmd, $tail, $client) = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";  
         
    my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);      my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
    $namespace=~s/\//\_/g;      chomp($what);
    $namespace=~s/\W//g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    chomp($what);   &GDBM_READER());
    my @queries=split(/\&/,$what);      if ($hashref) {
    my $proname=propath($udom,$uname);          my @queries=split(/\&/,$what);
    my $qresult='';          my $qresult='';
    my %hash;   for (my $i=0;$i<=$#queries;$i++) {
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {      $qresult.="$hashref->{$queries[$i]}&";
       for (my $i=0;$i<=$#queries;$i++) {   }
          $qresult.="$hash{$queries[$i]}&";   if (untie(%$hashref)) {
       }      $qresult=~s/\&$//;
       if (untie(%hash)) {      if ($cipher) {
          $qresult=~s/\&$//;   my $cmdlength=length($qresult);
          if ($cipher) {   $qresult.="         ";
             my $cmdlength=length($qresult);   my $encqresult='';
             $qresult.="         ";   for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
             my $encqresult='';      $encqresult.= unpack("H16", 
             for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {   $cipher->encrypt(substr($qresult,
                $encqresult.= unpack("H16", $cipher->encrypt(substr($qresult,   $encidx,
                                                                    $encidx,   8)));
                                                                    8)));   }
             }   &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
             Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);      } else {
          } else {   &Failure( $client, "error:no_key\n", $userinput);
             Failure( $client, "error:no_key\n", $userinput);      }
          }   } else {
       } else {      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      "while attempting eget\n", $userinput);
                               "while attempting eget\n", $userinput);   }
       }      } else {
    } else {   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   "while attempting eget\n", $userinput);
                        "while attempting eget\n", $userinput);      }
    }      
                return 1;
    return 1;  
 }  }
 RegisterHandler("eget", \&GetProfileEncrypted, 0, 1, 0);  &register_handler("eget", \&GetProfileEntryEncrypted, 0, 1, 0);
   
 #  #
 #   Deletes a key in a user profile database.  #   Deletes a key in a user profile database.
 #     #   
Line 1673  RegisterHandler("eget", \&GetProfileEncr Line 2355  RegisterHandler("eget", \&GetProfileEncr
 #     0   - Exit server.  #     0   - Exit server.
 #  #
 #  #
 sub DeletProfileEntry {  
    my $cmd      = shift;  sub delete_profile_entry {
    my $tail     = shift;      my ($cmd, $tail, $client) = @_;
    my $client   = shift;  
    my $userinput = "cmd:$tail";      my $userinput = "cmd:$tail";
   
    my ($udom,$uname,$namespace,$what) = split(/:/,$tail);      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
    $namespace=~s/\//\_/g;      chomp($what);
    $namespace=~s/\W//g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    chomp($what);   &GDBM_WRCREAT(),
    my $proname=propath($udom,$uname);   "D",$what);
    my $now=time;      if ($hashref) {
    unless ($namespace=~/^nohist\_/) {          my @keys=split(/\&/,$what);
       my $hfh;   foreach my $key (@keys) {
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {       delete($hashref->{$key});
          print $hfh "D:$now:$what\n";    }
       }   if (untie(%$hashref)) {
    }      &Reply($client, "ok\n", $userinput);
    my @keys=split(/\&/,$what);   } else {
    my %hash;      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {      "while attempting del\n", $userinput);
       foreach my $key (@keys) {   }
          delete($hash{$key});      } else {
       }   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
       if (untie(%hash)) {   "while attempting del\n", $userinput);
          Reply($client, "ok\n", $userinput);      }
       } else {      return 1;
          Failure($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);  &register_handler("del", \&delete_profile_entry, 0, 1, 0);
 #  #
 #  List the set of keys that are defined in a profile database file.  #  List the set of keys that are defined in a profile database file.
 #  A successful reply from this will contain an & separated list of  #  A successful reply from this will contain an & separated list of
Line 1725  RegisterHandler("del", \&DeleteProfileEn Line 2399  RegisterHandler("del", \&DeleteProfileEn
 #    1    - Continue processing.  #    1    - Continue processing.
 #    0    - Exit the server.  #    0    - Exit the server.
 #  #
 sub GetProfileKeys {  sub get_profile_keys {
    my $cmd       = shift;      my ($cmd, $tail, $client) = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";  
       my ($udom,$uname,$namespace)=split(/:/,$tail);
    my ($udom,$uname,$namespace)=split(/:/,$tail);      my $qresult='';
    $namespace=~s/\//\_/g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    $namespace=~s/\W//g;    &GDBM_READER());
    my $proname=propath($udom,$uname);      if ($hashref) {
    my $qresult='';   foreach my $key (keys %$hashref) {
    my %hash;      $qresult.="$key&";
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {   }
       foreach my $key (keys %hash) {   if (untie(%$hashref)) {
           $qresult.="$key&";      $qresult=~s/\&$//;
       }      &Reply($client, "$qresult\n", $userinput);
       if (untie(%hash)) {   } else {
          $qresult=~s/\&$//;      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
          Reply($client, "$qresult\n", $userinput);      "while attempting keys\n", $userinput);
       } else {   }
          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      } else {
                           "while attempting keys\n", $userinput);   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
       }   "while attempting keys\n", $userinput);
    } else {      }
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
                         "while attempting keys\n", $userinput);  
    }  
         
    return 1;      return 1;
 }  }
 RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);  &register_handler("keys", \&get_profile_keys, 0, 1, 0);
   
 #  #
 #   Dump the contents of a user profile database.  #   Dump the contents of a user profile database.
 #   Note that this constitutes a very large covert channel too since  #   Note that this constitutes a very large covert channel too since
Line 1775  RegisterHandler("keys", \&GetProfileKeys Line 2447  RegisterHandler("keys", \&GetProfileKeys
 #     1    - Continue processing.  #     1    - Continue processing.
 #     0    - Exit the server.  #     0    - Exit the server.
 #  #
 sub DumpProfileDatabase {  sub dump_profile_database {
    my $cmd       = shift;      my ($cmd, $tail, $client) = @_;
    my $tail      = shift;  
    my $client    = shift;      my $userinput = "$cmd:$tail";
    my $userinput = "$cmd:$tail";  
         
    my ($udom,$uname,$namespace) = split(/:/,$tail);      my ($udom,$uname,$namespace) = split(/:/,$tail);
    $namespace=~s/\//\_/g;      my $hashref = &tie_user_hash($udom, $uname, $namespace,
    $namespace=~s/\W//g;   &GDBM_READER());
    my $qresult='';      if ($hashref) {
    my $proname=propath($udom,$uname);   # Structure of %data:
    my %hash;   # $data{$symb}->{$parameter}=$value;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {   # $data{$symb}->{'v.'.$parameter}=$version;
       # Structure of %data:   # since $parameter will be unescaped, we do not
       # $data{$symb}->{$parameter}=$value;    # have to worry about silly parameter names...
       # $data{$symb}->{'v.'.$parameter}=$version;  
       # since $parameter will be unescaped, we do not          my $qresult='';
       # have to worry about silly parameter names...   my %data = ();                     # A hash of anonymous hashes..
       my %data = ();                     # A hash of anonymous hashes..   while (my ($key,$value) = each(%$hashref)) {
       while (my ($key,$value) = each(%hash)) {      my ($v,$symb,$param) = split(/:/,$key);
          my ($v,$symb,$param) = split(/:/,$key);      next if ($v eq 'version' || $symb eq 'keys');
          next if ($v eq 'version' || $symb eq 'keys');      next if (exists($data{$symb}) && 
          next if (exists($data{$symb}) &&        exists($data{$symb}->{$param}) &&
                   exists($data{$symb}->{$param}) &&       $data{$symb}->{'v.'.$param} > $v);
                   $data{$symb}->{'v.'.$param} > $v);      $data{$symb}->{$param}=$value;
          $data{$symb}->{$param}=$value;      $data{$symb}->{'v.'.$param}=$v;
          $data{$symb}->{'v.'.$param}=$v;   }
       }   if (untie(%$hashref)) {
       if (untie(%hash)) {      while (my ($symb,$param_hash) = each(%data)) {
          while (my ($symb,$param_hash) = each(%data)) {   while(my ($param,$value) = each (%$param_hash)){
             while(my ($param,$value) = each (%$param_hash)){      next if ($param =~ /^v\./);       # Ignore versions...
                next if ($param =~ /^v\./);       # Ignore versions...      #
                #      #   Just dump the symb=value pairs separated by &
                #   Just dump the symb=value pairs separated by &      #
                #      $qresult.=$symb.':'.$param.'='.$value.'&';
                $qresult.=$symb.':'.$param.'='.$value.'&';   }
             }      }
          }      chop($qresult);
          chop($qresult);      &Reply($client , "$qresult\n", $userinput);
          Reply($client , "$qresult\n", $userinput);   } else {
       } else {      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".       "while attempting currentdump\n", $userinput);
                            "while attempting currentdump\n", $userinput);   }
       }      } else {
    } else {   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   "while attempting currentdump\n", $userinput);
                         "while attempting currentdump\n", $userinput);      }
    }  
   
    return 1;      return 1;
 }  }
 RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);  &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
   
 #  #
 #   Dump a profile database with an optional regular expression  #   Dump a profile database with an optional regular expression
 #   to match against the keys.  In this dump, no effort is made  #   to match against the keys.  In this dump, no effort is made
Line 1851  RegisterHandler("currentdump", \&DumpPro Line 2522  RegisterHandler("currentdump", \&DumpPro
 # Side effects:  # Side effects:
 #    response is written to $client.  #    response is written to $client.
 #  #
 sub DumpWithRegexp {  sub dump_with_regexp {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
       my $userinput = "$cmd:$tail";
   my $userinput = "$cmd:$tail";  
       my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
   my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);      if (defined($regexp)) {
   $namespace=~s/\//\_/g;   $regexp=&unescape($regexp);
   $namespace=~s/\W//g;      } else {
   if (defined($regexp)) {   $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)) {      my $hashref = &tie_user_hash($udom, $uname, $namespace,
       chop($qresult);   &GDBM_READER());
       Reply($client, "$qresult\n", $userinput);      if ($hashref) {
           my $qresult='';
    while (my ($key,$value) = each(%$hashref)) {
       if ($regexp eq '.') {
    $qresult.=$key.'='.$value.'&';
       } else {
    my $unescapeKey = &unescape($key);
    if (eval('$unescapeKey=~/$regexp/')) {
       $qresult.="$key=$value&";
    }
       }
    }
    if (untie(%$hashref)) {
       chop($qresult);
       &Reply($client, "$qresult\n", $userinput);
    } else {
       &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting dump\n", $userinput);
    }
     } else {      } else {
       Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        "while attempting dump\n", $userinput);   "while attempting dump\n", $userinput);
     }      }
   } else {  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
     "while attempting dump\n", $userinput);  
   }  
   
     return 1;      return 1;
 }  }
 RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);  
   
 #  Store an aitem in any database but the roles database.  &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
   
   #  Store a set of key=value pairs associated with a versioned name.
 #  #
 #  Parameters:  #  Parameters:
 #    $cmd                - Request command keyword.  #    $cmd                - Request command keyword.
Line 1916  RegisterHandler("dump", \&DumpWithRegexp Line 2583  RegisterHandler("dump", \&DumpWithRegexp
 #      1 (keep on processing).  #      1 (keep on processing).
 #  Side-Effects:  #  Side-Effects:
 #    Writes to the client  #    Writes to the client
 sub StoreHandler {  sub store_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
     
   my $userinput = "$cmd:$tail";      my $userinput = "$cmd:$tail";
   
   my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);      my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
   $namespace=~s/\//\_/g;      if ($namespace ne 'roles') {
   $namespace=~s/\W//g;  
   if ($namespace ne 'roles') {   chomp($what);
     chomp($what);   my @pairs=split(/\&/,$what);
     my $proname=propath($udom,$uname);   my $hashref  = &tie_user_hash($udom, $uname, $namespace,
     my $now=time;         &GDBM_WRCREAT(), "P",
     unless ($namespace=~/^nohist\_/) {         "$rid:$what");
       my $hfh;   if ($hashref) {
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {      my $now = time;
  print $hfh "P:$now:$rid:$what\n";       my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
       }      my $key;
     }      $hashref->{"version:$rid"}++;
     my @pairs=split(/\&/,$what);      my $version=$hashref->{"version:$rid"};
     my %hash;      my $allkeys=''; 
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",      foreach my $pair (@pairs) {
     &GDBM_WRCREAT(),0640)) {   my ($key,$value)=split(/=/,$pair);
       my @previouskeys=split(/&/,$hash{"keys:$rid"});   $allkeys.=$key.':';
       my $key;   $hashref->{"$version:$rid:$key"}=$value;
       $hash{"version:$rid"}++;      }
       my $version=$hash{"version:$rid"};      $hashref->{"$version:$rid:timestamp"}=$now;
       my $allkeys='';       $allkeys.='timestamp';
       foreach my $pair (@pairs) {      $hashref->{"$version:keys:$rid"}=$allkeys;
  my ($key,$value)=split(/=/,$pair);      if (untie($hashref)) {
  $allkeys.=$key.':';   &Reply($client, "ok\n", $userinput);
  $hash{"$version:$rid:$key"}=$value;      } else {
       }   &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       $hash{"$version:$rid:timestamp"}=$now;   "while attempting store\n", $userinput);
       $allkeys.='timestamp';      }
       $hash{"$version:keys:$rid"}=$allkeys;   } else {
       if (untie(%hash)) {      &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  Reply($client, "ok\n", $userinput);       "while attempting store\n", $userinput);
       } else {   }
  Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
  "while attempting store\n", $userinput);  
       }  
     } else {      } else {
       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".   &Failure($client, "refused\n", $userinput);
        "while attempting store\n", $userinput);  
     }      }
   } else {  
     Failure($client, "refused\n", $userinput);  
   }  
   
   return 1;      return 1;
 }  }
 RegisterHandler("store", \&StoreHandler, 0, 1, 0);  &register_handler("store", \&store_handler, 0, 1, 0);
 #  #
 #   Restore a prior version of a resource.  #  Dump out all versions of a resource that has key=value pairs associated
   # with it for each version.  These resources are built up via the store
   # command.
 #  #
 #  Parameters:  #  Parameters:
 #     $cmd               - Command keyword.  #     $cmd               - Command keyword.
Line 1985  RegisterHandler("store", \&StoreHandler, Line 2645  RegisterHandler("store", \&StoreHandler,
 #      1  indicating the caller should not yet exit.  #      1  indicating the caller should not yet exit.
 # Side-effects:  # Side-effects:
 #   Writes a reply to the client.  #   Writes a reply to the client.
   #   The reply is a string of the following shape:
   #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
   #    Where the 1 above represents version 1.
   #    this continues for all pairs of keys in all versions.
 #  #
 sub RestoreHandler {  #
   my $cmd     = shift;  #    
   my $tail    = shift;  #
   my $client  = shift;  sub restore_handler {
       my ($cmd, $tail, $client) = @_;
   my $userinput = "$cmd:$tail"; # Only used for logging purposes.  
       my $userinput = "$cmd:$tail"; # Only used for logging purposes.
   my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);  
   $namespace=~s/\//\_/g;      my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
   $namespace=~s/\W//g;      $namespace=~s/\//\_/g;
   chomp($rid);      $namespace=~s/\W//g;
   my $proname=propath($udom,$uname);      chomp($rid);
   my $qresult='';      my $proname=&propath($udom,$uname);
   my %hash;      my $qresult='';
   if (tie(%hash,'GDBM_File',"$proname/$namespace.db",      my %hash;
   &GDBM_READER(),0640)) {      if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
     my $version=$hash{"version:$rid"};      &GDBM_READER(),0640)) {
     $qresult.="version=$version&";   my $version=$hash{"version:$rid"};
     my $scope;   $qresult.="version=$version&";
     for ($scope=1;$scope<=$version;$scope++) {   my $scope;
       my $vkeys=$hash{"$scope:keys:$rid"};   for ($scope=1;$scope<=$version;$scope++) {
  my @keys=split(/:/,$vkeys);      my $vkeys=$hash{"$scope:keys:$rid"};
       my $key;      my @keys=split(/:/,$vkeys);
       $qresult.="$scope:keys=$vkeys&";      my $key;
       foreach $key (@keys) {      $qresult.="$scope:keys=$vkeys&";
  $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";      foreach $key (@keys) {
       }                                     $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
     }      }                                  
      if (untie(%hash)) {   }
        $qresult=~s/\&$//;   if (untie(%hash)) {
        Reply( $client, "$qresult\n", $userinput);      $qresult=~s/\&$//;
      } else {      &Reply( $client, "$qresult\n", $userinput);
        Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".   } else {
        "while attempting restore\n", $userinput);      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
      }      "while attempting restore\n", $userinput);
   } else {   }
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      } else {
     "while attempting restore\n", $userinput);   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
   }   "while attempting restore\n", $userinput);
       }
       
   return 1;      return 1;
   
   
 }  }
 RegisterHandler("restor", \&RestoreHandler, 0,1,0);  &register_handler("restore", \&restore_handler, 0,1,0);
   
 #  #
 #   Add a chat message to to a discussion board.  #   Add a chat message to to a discussion board.
Line 2050  RegisterHandler("restor", \&RestoreHandl Line 2715  RegisterHandler("restor", \&RestoreHandl
 #   writes a reply to the client.  #   writes a reply to the client.
 #  #
 #  #
 sub SendChatHandler {  sub send_chat_handler {
   my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
   my $tail    = shift;  
   my $client  = shift;  
   
   my $userinput = "$cmd:$tail";      
       my $userinput = "$cmd:$tail";
   
   my ($cdom,$cnum,$newpost)=split(/\:/,$tail);      my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
   &chatadd($cdom,$cnum,$newpost);      &chat_add($cdom,$cnum,$newpost);
   Reply($client, "ok\n", $userinput);      &Reply($client, "ok\n", $userinput);
   
   return 1;      return 1;
 }  }
 RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);  &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
 #  #
 #   Retrieve the set of chat messagss from a discussion board.  #   Retrieve the set of chat messagss from a discussion board.
 #  #
Line 2081  RegisterHandler("chatsend", \&SendChatHa Line 2745  RegisterHandler("chatsend", \&SendChatHa
 # Side effects:  # Side effects:
 #    Response is written to the client.  #    Response is written to the client.
 #  #
 sub RetrieveChatHandler {  sub retrieve_chat_handler {
   my $cmd      = shift;      my ($cmd, $tail, $client) = @_;
   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);  
   
       my $userinput = "$cmd:$tail";
   
   return 1;      my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
       my $reply='';
       foreach (&get_chat($cdom,$cnum,$udom,$uname)) {
    $reply.=&escape($_).':';
       }
       $reply=~s/\:$//;
       &Reply($client, $reply."\n", $userinput);
   
   
       return 1;
 }  }
 RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);  &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
   
 #  #
 #  Initiate a query of an sql database.  SQL query repsonses get put in  #  Initiate a query of an sql database.  SQL query repsonses get put in
 #  a file for later retrieval.  This prevents sql query results from  #  a file for later retrieval.  This prevents sql query results from
Line 2119  RegisterHandler("chatretr", \&RetrieveCh Line 2783  RegisterHandler("chatretr", \&RetrieveCh
 # Side-effects:  # Side-effects:
 #    a reply is written to $client.  #    a reply is written to $client.
 #  #
 sub SendQueryHandler {  sub send_query_handler {
   my $cmd     = shift;      my ($cmd, $tail, $client) = @_;
   my $tail    = shift;  
   my $client  = shift;  
       my $userinput = "$cmd:$tail";
   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;      my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
       $query=~s/\n*$//g;
       &Reply($client, "". &sql_reply("$clientname\&$query".
    "\&$arg1"."\&$arg2"."\&$arg3")."\n",
     $userinput);
       
       return 1;
 }  }
 RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);  &register_handler("querysend", \&send_query_handler, 0, 1, 0);
   
 #  #
 #   Add a reply to an sql query.  SQL queries are done asyncrhonously.  #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
Line 2161  RegisterHandler("querysend", \&SendQuery Line 2824  RegisterHandler("querysend", \&SendQuery
 # Side effects:  # Side effects:
 #    ok written to the client.  #    ok written to the client.
 #  #
 sub ReplyQueryHandler {  sub reply_query_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
       my $userinput = "$cmd:$tail";
   my $userinput = "$cmd:$tail";  
       my ($cmd,$id,$reply)=split(/:/,$userinput); 
   my ($cmd,$id,$reply)=split(/:/,$userinput);       my $store;
   my $store;      my $execdir=$perlvar{'lonDaemons'};
   my $execdir=$perlvar{'lonDaemons'};      if ($store=IO::File->new(">$execdir/tmp/$id")) {
   if ($store=IO::File->new(">$execdir/tmp/$id")) {   $reply=~s/\&/\n/g;
     $reply=~s/\&/\n/g;   print $store $reply;
          print $store $reply;   close $store;
     close $store;   my $store2=IO::File->new(">$execdir/tmp/$id.end");
     my $store2=IO::File->new(">$execdir/tmp/$id.end");   print $store2 "done\n";
     print $store2 "done\n";   close $store2;
     close $store2;   &Reply($client, "ok\n", $userinput);
     Reply($client, "ok\n", $userinput);      } else {
   }   &Failure($client, "error: ".($!+0)
   else {   ." IO::File->new Failed ".
     Failure($client, "error: ".($!+0)   "while attempting queryreply\n", $userinput);
     ." IO::File->new Failed ".      }
     "while attempting queryreply\n", $userinput);  
   }  
     
   
   return 1;      return 1;
 }  }
 RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);  &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
   
 #  #
 #  Process the courseidput query.  Not quite sure what this means  #  Process the courseidput request.  Not quite sure what this means
 #  at the system level sense.  It appears a gdbm file in the   #  at the system level sense.  It appears a gdbm file in the 
 #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and  #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
 #  a set of entries made in that database.  #  a set of entries made in that database.
Line 2208  RegisterHandler("queryreply", \&ReplyQue Line 2870  RegisterHandler("queryreply", \&ReplyQue
 # Side effects:  # Side effects:
 #   reply is written to the client.  #   reply is written to the client.
 #  #
 sub PutCourseIdHandler {  sub put_course_id_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;  
       my $userinput = "$cmd:$tail";
   my $userinput = "$cmd:$tail";  
       my ($udom, $what) = split(/:/, $tail);
   my ($udom,$what)=split(/:/,$tail);      chomp($what);
   chomp($what);      my $now=time;
   $udom=~s/\W//g;      my @pairs=split(/\&/,$what);
   my $proname=  
     "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";      my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
   my $now=time;      if ($hashref) {
   my @pairs=split(/\&/,$what);   foreach my $pair (@pairs) {
   my %hash;      my ($key,$value)=split(/=/,$pair);
   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {      $hashref->{$key}=$value.':'.$now;
     foreach my $pair (@pairs) {   }
       my ($key,$value)=split(/=/,$pair);   if (untie(%$hashref)) {
       $hash{$key}=$value.':'.$now;      &Reply($client, "ok\n", $userinput);
     }   } else {
     if (untie(%hash)) {      &Failure( $client, "error: ".($!+0)
       Reply($client, "ok\n", $userinput);       ." untie(GDBM) Failed ".
     } else {       "while attempting courseidput\n", $userinput);
       Failure( $client, "error: ".($!+0)   }
        ." untie(GDBM) Failed ".      } else {
        "while attempting courseidput\n", $userinput);   &Failure( $client, "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting courseidput\n", $userinput);
     }      }
   } else {  
     Failure( $client, "error: ".($!+0)  
      ." tie(GDBM) Failed ".  
      "while attempting courseidput\n", $userinput);  
   }  
   
   return 1;      return 1;
 }  }
 RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);  &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
   
 #  Retrieves the value of a course id resource keyword pattern  #  Retrieves the value of a course id resource keyword pattern
 #  defined since a starting date.  Both the starting date and the  #  defined since a starting date.  Both the starting date and the
Line 2268  RegisterHandler("courseidput", \&PutCour Line 2927  RegisterHandler("courseidput", \&PutCour
 #    1     - Continue processing.  #    1     - Continue processing.
 # Side Effects:  # Side Effects:
 #   a reply is written to $client.  #   a reply is written to $client.
 sub DumpCourseIdHandler {  sub dump_course_id_handler {
   my $cmd    = shift;      my ($cmd, $tail, $client) = @_;
   my $tail   = shift;  
   my $client = shift;      my $userinput = "$cmd:$tail";
   
   my $userinput = "$cmd:$tail";      my ($udom,$since,$description) =split(/:/,$tail);
       if (defined($description)) {
   my ($udom,$since,$description) =split(/:/,$tail);   $description=&unescape($description);
   if (defined($description)) {      } else {
     $description=&unescape($description);   $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=$descr&";  
  }  
       }  
     }      }
     if (untie(%hash)) {      unless (defined($since)) { $since=0; }
       chop($qresult);      my $qresult='';
       Reply($client, "$qresult\n", $userinput);      my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
       if ($hashref) {
    while (my ($key,$value) = each(%$hashref)) {
       my ($descr,$lasttime,$inst_code);
       if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
    ($descr,$inst_code,$lasttime)=($1,$2,$3);
       } else {
    ($descr,$lasttime) = split(/\:/,$value);
       }
       if ($lasttime<$since) { next; }
       if ($description eq '.') {
    $qresult.=$key.'='.$descr.':'.$inst_code.'&';
       } else {
    my $unescapeVal = &unescape($descr);
    if (eval('$unescapeVal=~/\Q$description\E/i')) {
       $qresult.=$key.'='.$descr.':'.$inst_code.'&';
    }
       }
    }
    if (untie(%$hashref)) {
       chop($qresult);
       &Reply($client, "$qresult\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);
    }
     } else {      } else {
       Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
       "while attempting courseiddump\n", $userinput);   "while attempting courseiddump\n", $userinput);
     }      }
   } else {  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
     "while attempting courseiddump\n", $userinput);  
   }  
   
   
   return 1;      return 1;
 }  }
 RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);  &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
 #  #
 #  Puts an id to a domains id database.   
 #  #
 #  Parameters:  
 #   $cmd     - The command that triggered us.  
 #   $tail    - Remainder of the request other than the command. This is a   
 #              colon separated list containing:  
 #              $domain  - The domain for which we are writing the id.  
 #              $pairs  - The id info to write... this is and & separated list  
 #                        of keyword=value.  
 #   $client  - Socket open on the client.  
 #  Returns:  
 #    1   - Continue processing.  
 #  Side effects:  
 #     reply is written to $client.  
 #  #
 sub 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.  #   Getting, decoding and dispatching requests:
 #  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:  #   Get a Request:
 #    1 - indicating processing should continue.  #   Gets a Request message from the client.  The transaction
 # Side effects:  #   is defined as a 'line' of text.  We remove the new line
 #   An & separated list of results is written to $client.  #   from the text line.  
 #  #
 sub GetIdHandler {  sub get_request {
   my $cmd    = shift;      my $input = <$client>;
   my $tail   = shift;      chomp($input);
   my $client = shift;  
       &Debug("get_request: Request = $input\n");
   my $userinput = "$client:$tail";  
       &status('Processing '.$clientname.':'.$input);
   my ($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;      return $input;
 }  }
 RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);  #---------------------------------------------------------------
 #------------------------------------------------------------------------------------  
 #  #
 #   Process a Request.  Takes a request from the client validates  #  Process a request.  This sub should shrink as each action
 #   it and performs the operation requested by it.  Returns  #  gets farmed out into a separat sub that is registered 
 #   a response to the client.  #  with the dispatch hash.  
 #  #
 #  Parameters:  # Parameters:
 #      request      - A string containing the user's request.  #    user_input   - The request received from the client (lonc).
 #  Returns:  # Returns:
 #      0            - Requested to exit, caller should shut down.  #    true to keep processing, false if caller should exit.
 #      1            - Accept additional requests from the client.  
 #  #
 sub ProcessRequest {  sub process_request {
    my $Request      = shift;      my ($userinput) = @_;      # Easier for now to break style than to
    my $KeepGoing    = 1; # Assume we're not asked to stop.                                  # fix all the userinput -> user_input.
           my $wasenc    = 0; # True if request was encrypted.
    my $wasenc=0;  
    my $userinput = $Request;   # for compatibility with oldcode <yeach>  
   
   
 # ------------------------------------------------------------ See if encrypted  # ------------------------------------------------------------ See if encrypted
          if ($userinput =~ /^enc/) {
    if($userinput =~ /^enc/) {   $userinput = decipher($userinput);
       $wasenc = 1;   $wasenc=1;
       $userinput = Decipher($userinput);   if(!$userinput) { # Cipher not defined.
       if(! $userinput) {      &Failure($client, "error: Encrypted data without negotated key");
          Failure($client,"error:Encrypted data without negotiating key");      return 0;
          return 0;                      # Break off with this imposter.   }
       }      }
    }      Debug("process_request: $userinput\n");
    # Split off the request keyword from the rest of the stuff.      
          #  
    my ($command, $tail) = split(/:/, $userinput, 2);      #   The 'correct way' to add a command to lond is now to
       #   write a sub to execute it and Add it to the command dispatch
    Debug("Command received: $command, encoded = $wasenc");      #   hash via a call to register_handler..  The comments to that
       #   sub should give you enough to go on to show how to do this
          #   along with the examples that are building up as this code
 # ------------------------------------------------------------- Normal commands      #   is getting refactored.   Until all branches of the
       #   if/elseif monster below have been factored out into
    #       #   separate procesor subs, if the dispatch hash is missing
    #   If the command is in the hash, then execute it via the hash dispatch:      #   the command keyword, we will fall through to the remainder
    #      #   of the if/else chain below in order to keep this thing in 
    if(defined $Dispatcher{$command}) {      #   working order throughout the transmogrification.
   
       my $DispatchInfo = $Dispatcher{$command};      my ($command, $tail) = split(/:/, $userinput, 2);
       my $Handler      = $$DispatchInfo[0];      chomp($command);
       my $NeedEncode   = $$DispatchInfo[1];      chomp($tail);
       my $ClientTypes  = $$DispatchInfo[2];      $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
       Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");      $command =~ s/(\r)//; # And this too for parameterless commands.
       if(!$tail) {
    $tail =""; # defined but blank.
       }
   
       &Debug("Command received: $command, encoded = $wasenc");
   
       if(defined $Dispatcher{$command}) {
   
    my $dispatch_info = $Dispatcher{$command};
    my $handler       = $$dispatch_info[0];
    my $need_encode   = $$dispatch_info[1];
    my $client_types  = $$dispatch_info[2];
    Debug("Matched dispatch hash: mustencode: $need_encode "
         ."ClientType $client_types");
               
       #  Validate the request:   #  Validate the request:
               
       my $ok = 1;   my $ok = 1;
       my $requesterprivs = 0;   my $requesterprivs = 0;
       if(isClient()) {   if(&isClient()) {
  $requesterprivs |= $CLIENT_OK;      $requesterprivs |= $CLIENT_OK;
       }   }
       if(isManager()) {   if(&isManager()) {
  $requesterprivs |= $MANAGER_OK;      $requesterprivs |= $MANAGER_OK;
       }   }
       if($NeedEncode && (!$wasenc)) {   if($need_encode && (!$wasenc)) {
  Debug("Must encode but wasn't: $NeedEncode $wasenc");      Debug("Must encode but wasn't: $need_encode $wasenc");
          $ok = 0;      $ok = 0;
       }   }
       if(($ClientTypes & $requesterprivs) == 0) {   if(($client_types & $requesterprivs) == 0) {
  Debug("Client not privileged to do this operation");      Debug("Client not privileged to do this operation");
  $ok = 0;      $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);  
       }  
   
    if($ok) {
       Debug("Dispatching to handler $command $tail");
       my $keep_going = &$handler($command, $tail, $client);
       return $keep_going;
    } else {
       Debug("Refusing to dispatch because client did not match requirements");
       Failure($client, "refused\n", $userinput);
       return 1;
    }
   
       }    
   
   #------------------- Commands not yet in spearate handlers. --------------
   
   
   # ----------------------------------------------------------------------- idput
       if ($userinput =~ /^idput/) {
    if(isClient) {
       my ($cmd,$udom,$what)=split(/:/,$userinput);
       chomp($what);
       $udom=~s/\W//g;
       my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
       my $now=time;
       my @pairs=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
    {
       my $hfh;
       if ($hfh=IO::File->new(">>$proname.hist")) {
    print $hfh "P:$now:$what\n";
       }
    }
    foreach my $pair (@pairs) {
       my ($key,$value)=split(/=/,$pair);
       $hash{$key}=$value;
    }
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting idput\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting idput\n";
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
    }
   # ----------------------------------------------------------------------- idget
       } elsif ($userinput =~ /^idget/) {
    if(isClient) {
       my ($cmd,$udom,$what)=split(/:/,$userinput);
       chomp($what);
       $udom=~s/\W//g;
       my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
       my @queries=split(/\&/,$what);
       my $qresult='';
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
    for (my $i=0;$i<=$#queries;$i++) {
       $qresult.="$hash{$queries[$i]}&";
    }
    if (untie(%hash)) {
       $qresult=~s/\&$//;
       print $client "$qresult\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting idget\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting idget\n";
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
    }
 # ---------------------------------------------------------------------- tmpput  # ---------------------------------------------------------------------- tmpput
    } elsif ($userinput =~ /^tmpput/) {      } elsif ($userinput =~ /^tmpput/) {
       if(isClient) {   if(isClient) {
          my ($cmd,$what)=split(/:/,$userinput);      my ($cmd,$what)=split(/:/,$userinput);
          my $store;      my $store;
          $tmpsnum++;      $tmpsnum++;
          my $id=$$.'_'.$clientip.'_'.$tmpsnum;      my $id=$$.'_'.$clientip.'_'.$tmpsnum;
          $id=~s/\W/\_/g;      $id=~s/\W/\_/g;
          $what=~s/\n//g;      $what=~s/\n//g;
          my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
          if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {      if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
             print $store $what;   print $store $what;
             close $store;   close $store;
             Reply($client, "$id\n", $userinput);   print $client "$id\n";
          }      }
          else {      else {
             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".   print $client "error: ".($!+0)
                            "while attempting tmpput\n", $userinput);      ."IO::File->new Failed ".
          }      "while attempting tmpput\n";
       } else {      }
          Failure($client, "refused\n", $userinput);   } else {
       Reply($client, "refused\n", $userinput);
           
       }   }
   
 # ---------------------------------------------------------------------- tmpget  # ---------------------------------------------------------------------- tmpget
    } elsif ($userinput =~ /^tmpget/) {      } elsif ($userinput =~ /^tmpget/) {
       if(isClient) {   if(isClient) {
          my ($cmd,$id)=split(/:/,$userinput);      my ($cmd,$id)=split(/:/,$userinput);
          chomp($id);      chomp($id);
          $id=~s/\W/\_/g;      $id=~s/\W/\_/g;
          my $store;      my $store;
          my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
          if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {      if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
             my $reply=<$store>;   my $reply=<$store>;
             Reply( $client, "$reply\n", $userinput);      print $client "$reply\n";
             close $store;   close $store;
          }      }
          else {      else {
             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".   print $client "error: ".($!+0)
                                "while attempting tmpget\n", $userinput);      ."IO::File->new Failed ".
          }      "while attempting tmpget\n";
       } else {      }
          Failure($client, "refused\n", $userinput);   } else {
       Reply($client, "refused\n", $userinput);
           
       }   }
 # ---------------------------------------------------------------------- tmpdel  # ---------------------------------------------------------------------- tmpdel
    } elsif ($userinput =~ /^tmpdel/) {      } elsif ($userinput =~ /^tmpdel/) {
       if(isClient) {   if(isClient) {
          my ($cmd,$id)=split(/:/,$userinput);      my ($cmd,$id)=split(/:/,$userinput);
          chomp($id);      chomp($id);
          $id=~s/\W/\_/g;      $id=~s/\W/\_/g;
          my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
          if (unlink("$execdir/tmp/$id.tmp")) {      if (unlink("$execdir/tmp/$id.tmp")) {
             Reply($client, "ok\n", $userinput);   print $client "ok\n";
          } else {      } else {
             Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".   print $client "error: ".($!+0)
                                  "while attempting tmpdel\n", $userinput);      ."Unlink tmp Failed ".
          }      "while attempting tmpdel\n";
       } else {      }
          Failure($client, "refused\n", $userinput);   } else {
       }      Reply($client, "refused\n", $userinput);
       
    }
 # -------------------------------------------------------------------------- ls  # -------------------------------------------------------------------------- ls
    } elsif ($userinput =~ /^ls/) {      } elsif ($userinput =~ /^ls/) {
       if(isClient) {   if(isClient) {
          my ($cmd,$ulsdir)=split(/:/,$userinput);      my $obs;
          my $ulsout='';      my $rights;
          my $ulsfn;      my ($cmd,$ulsdir)=split(/:/,$userinput);
          if (-e $ulsdir) {      my $ulsout='';
             if(-d $ulsdir) {      my $ulsfn;
                if (opendir(LSDIR,$ulsdir)) {      if (-e $ulsdir) {
                   while ($ulsfn=readdir(LSDIR)) {   if(-d $ulsdir) {
                      my @ulsstats=stat($ulsdir.'/'.$ulsfn);      if (opendir(LSDIR,$ulsdir)) {
                      $ulsout.=$ulsfn.'&'.   while ($ulsfn=readdir(LSDIR)) {
                      join('&',@ulsstats).':';      undef $obs, $rights; 
                   }      my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   closedir(LSDIR);      #We do some obsolete checking here
                }      if(-e $ulsdir.'/'.$ulsfn.".meta") { 
             } else {   open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                my @ulsstats=stat($ulsdir);   my @obsolete=<FILE>;
                $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';   foreach my $obsolete (@obsolete) {
             }      if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; } 
          } else {      if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
             $ulsout='no_such_dir';   }
          }      }
          if ($ulsout eq '') { $ulsout='empty'; }      $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
          Reply($client, "$ulsout\n", $userinput);      if($obs eq '1') { $ulsout.="&1"; }
       } else {      else { $ulsout.="&0"; }
          Failure($client, "refused\n", $userinput);      if($rights eq '1') { $ulsout.="&1:"; }
       else { $ulsout.="&0:"; }
    }
    closedir(LSDIR);
       }
    } else {
       my @ulsstats=stat($ulsdir);
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
    }
       } else {
    $ulsout='no_such_dir';
       }
       if ($ulsout eq '') { $ulsout='empty'; }
       print $client "$ulsout\n";
    } else {
       Reply($client, "refused\n", $userinput);
           
       }   }
 # ----------------------------------------------------------------- setannounce  # ----------------------------------------------------------------- setannounce
    } elsif ($userinput =~ /^setannounce/) {      } elsif ($userinput =~ /^setannounce/) {
       if (isClient) {   if (isClient) {
          my ($cmd,$announcement)=split(/:/,$userinput);      my ($cmd,$announcement)=split(/:/,$userinput);
          chomp($announcement);      chomp($announcement);
          $announcement=&unescape($announcement);      $announcement=&unescape($announcement);
          if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.      if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                                              '/announcement.txt')) {   '/announcement.txt')) {
             print $store $announcement;   print $store $announcement;
             close $store;   close $store;
             Reply($client, "ok\n", $userinput);   print $client "ok\n";
          } else {      } else {
             Failure($client, "error: ".($!+0)."\n", $userinput);   print $client "error: ".($!+0)."\n";
          }      }
       } else {   } else {
          Failure($client, "refused\n", $userinput);      Reply($client, "refused\n", $userinput);
           
       }   }
 # ------------------------------------------------------------------ Hanging up  # ------------------------------------------------------------------ Hanging up
    } elsif (($userinput =~ /^exit/) ||      } elsif (($userinput =~ /^exit/) ||
          ($userinput =~ /^init/)) { # no restrictions.       ($userinput =~ /^init/)) { # no restrictions.
       &logthis("Client $clientip ($clientname) hanging up: $userinput");   &logthis(
       Reply($client, "bye\n", $userinput);   "Client $clientip ($clientname) hanging up: $userinput");
       $client->shutdown(2);        # shutdown the socket forcibly.   print $client "bye\n";
       $client->close();   $client->shutdown(2);        # shutdown the socket forcibly.
       $KeepGoing = 0; # Flag to exit the program.   $client->close();
    return 0;
   
 # ---------------------------------- set current host/domain  # ---------------------------------- set current host/domain
    } elsif ($userinput =~ /^sethost:/) {      } elsif ($userinput =~ /^sethost/) {
       if (isClient) {   if (isClient) {
          Reply($client, &sethost($userinput)."\n", $userinput);      print $client &sethost($userinput)."\n";
       } else {   } else {
          Failure($client, "refused\n", $userinput);      print $client "refused\n";
       }   }
 #---------------------------------- request file (?) version.  #---------------------------------- request file (?) version.
     } elsif ($userinput =~/^version:/) {      } elsif ($userinput =~/^version/) {
  if (isClient) {   if (isClient) {
     Reply($client, &version($userinput)."\n", $userinput);      print $client &version($userinput)."\n";
  } else {   } else {
     Reply( $client, "refused\n", $userinput);      print $client "refused\n";
  }   }
 # ------------------------------------------------------------- unknown command  #------------------------------- is auto-enrollment enabled?
       } elsif ($userinput =~/^autorun/) {
    } else {   if (isClient) {
  # unknown command      my ($cmd,$cdom) = split(/:/,$userinput);
       Failure($client, "unknown_cmd\n", $userinput);      my $outcome = &localenroll::run($cdom);
    }      print $client "$outcome\n";
    } else {
     return $KeepGoing;      print $client "0\n";
 }  
   
   
 #  
 #   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 = <$oldfh>;  # Suck in the entire file.  #------------------------------- get official sections (for auto-enrollment).
       } elsif ($userinput =~/^autogetsections/) {
  # write the backup file:   if (isClient) {
       my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
  my $newfh = IO::File->new("> $newfile");      my @secs = &localenroll::get_sections($coursecode,$cdom);
  if(!(defined $newfh)){      my $seclist = &escape(join(':',@secs));
     return 0;      print $client "$seclist\n";
    } else {
       print $client "refused\n";
  }   }
  my $lines = scalar @contents;  #----------------------- validate owner of new course section (for auto-enrollment).
  for (my $i =0; $i < $lines; $i++) {      } elsif ($userinput =~/^autonewcourse/) {
     print $newfh ($contents[$i]);   if (isClient) {
       my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
       my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
       print $client "$outcome\n";
    } else {
       print $client "refused\n";
  }   }
   #-------------- validate course section in schedule of classes (for auto-enrollment).
  $oldfh->close;      } elsif ($userinput =~/^autovalidatecourse/) {
  $newfh->close;   if (isClient) {
       my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
  chmod(0660, $newfile);      my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
       print $client "$outcome\n";
  return 1;   } else {
           print $client "refused\n";
     } 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.  
  }   }
  }  #--------------------------- create password for new user (for auto-enrollment).
  return $adjusted;      } elsif ($userinput =~/^autocreatepassword/) {
 }   if (isClient) {
 #      my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
 #   InstallFile: Called to install an administrative file:      my ($create_passwd,$authchk);
 #       - The file is created with <name>.tmp      ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
 #       - The <name>.tmp file is then mv'd to <name>      print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
 #   This lugubrious procedure is done to ensure that we are never without   } else {
 #   a valid, even if dated, version of the file regardless of who crashes      print $client "refused\n";
 #   and when the crash occurs.   }
 #  #---------------------------  read and remove temporary files (for auto-enrollment).
 #  Parameters:      } elsif ($userinput =~/^autoretrieve/) {
 #       Name of the file   if (isClient) {
 #       File Contents.      my ($cmd,$filename) = split(/:/,$userinput);
 #  Return:      my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
 #      nonzero - success.      if ( (-e $source) && ($filename ne '') ) {
 #      0       - failure and $! has an errno.   my $reply = '';
 #   if (open(my $fh,$source)) {
 sub InstallFile {      while (<$fh>) {
     my $Filename = shift;   chomp($_);
     my $Contents = shift;   $_ =~ s/^\s+//g;
     my $TempFile = $Filename.".tmp";   $_ =~ s/\s+$//g;
    $reply .= $_;
     #  Open the file for write:      }
       close($fh);
     my $fh = IO::File->new("> $TempFile"); # Write to temp.      print $client &escape($reply)."\n";
     if(!(defined $fh)) {  #                                unlink($source);
  &logthis('<font color="red"> Unable to create '.$TempFile."</font>");   } else {
  return 0;      print $client "error\n";
    }
       } else {
    print $client "error\n";
       }
    } else {
       print $client "refused\n";
    }
   #---------------------  read and retrieve institutional code format (for support form).
       } elsif ($userinput =~/^autoinstcodeformat/) {
    if (isClient) {
       my $reply;
       my($cmd,$cdom,$course) = split(/:/,$userinput);
       my @pairs = split/\&/,$course;
       my %instcodes = ();
       my %codes = ();
       my @codetitles = ();
       my %cat_titles = ();
       my %cat_order = ();
       foreach (@pairs) {
    my ($key,$value) = split/=/,$_;
    $instcodes{&unescape($key)} = &unescape($value);
       }
       my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
       if ($formatreply eq 'ok') {
    my $codes_str = &hash2str(%codes);
    my $codetitles_str = &array2str(@codetitles);
    my $cat_titles_str = &hash2str(%cat_titles);
    my $cat_order_str = &hash2str(%cat_order);
    print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
       }
    } else {
       print $client "refused\n";
    }
   # ------------------------------------------------------------- unknown command
   
       } else {
    # unknown command
    print $client "unknown_cmd\n";
     }      }
     #  write the contents of the file:  # -------------------------------------------------------------------- complete
       Debug("process_request - returning 1");
     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;      return 1;
 }  }
 #  #
 #   ConfigFileFromSelector: converts a configuration file selector  #   Decipher encoded traffic
 #                 (one of host or domain at this point) into a   
 #                 configuration file pathname.  
 #  
 #  Parameters:  #  Parameters:
 #      selector  - Configuration file selector.  #     input      - Encoded data.
 #  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:  #  Returns:
 #     String to send to client ("ok" or "refused" if bad file).  #     Decoded data or undef if encryption key was not yet negotiated.
   #  Implicit input:
   #     cipher  - This global holds the negotiated encryption key.
 #  #
 sub PushFile {  sub decipher {
     my $request = shift;          my ($input)  = @_;
     my ($command, $filename, $contents) = split(":", $request, 3);      my $output = '';
           
     #  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      if($cipher) {
     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible   my($enc, $enclength, $encinput) = split(/:/, $input);
     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a    for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)      $output .= 
     #  that possibilty.   $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
   
     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 $loncpid = <PIDFILE>;   return substr($output, 0, $enclength);
  close(PIDFILE);  
  logthis('<font color="red"> Reinitializing lonc pid='.$loncpid  
  ."</font>");  
  kill("USR2", $loncpid);  
     } elsif ($process eq 'lond') {  
  logthis('<font color="red"> Reinitializing self (lond) </font>');  
  &UpdateHosts; # Lond is us!!  
     } else {      } else {
  &logthis('<font color="yellow" Invalid reinit request for '.$process   return undef;
  ."</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   #   Register a command processor.  This function is invoked to register a sub
 #               file.  It is the caller's responsiblity to validate the  #   to process a request.  Once registered, the ProcessRequest sub can automatically
 #               edit line.  #   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:  #   Parameters:
 #      $directive - A single edit directive to apply.    #    $request_name         - Name of the request being registered.
 #                   Edit directives are of the form:  #                           This is the command request that will match
 #                  append|newline      - Appends a new line to the file.  #                           against the hash keywords to lookup the information
 #                  replace|key|newline - Replaces the line with key value 'key'  #                           associated with the dispatch information.
 #                  delete|key          - Deletes the line with key value 'key'.  #    $procedure           - Reference to a sub to call to process the request.
 #      $editor   - A config file editor object that contains the  #                           All subs get called as follows:
 #                  file being edited.  #                             Procedure($cmd, $tail, $replyfd, $key)
   #                             $cmd    - the actual keyword that invoked us.
   #                             $tail   - the tail of the request that invoked us.
   #                             $replyfd- File descriptor connected to the client
   #    $must_encode          - True if the request must be encoded to be good.
   #    $client_ok            - True if it's ok for a client to request this.
   #    $manager_ok           - True if it's ok for a manager to request this.
   # Side effects:
   #      - On success, the Dispatcher hash has an entry added for the key $RequestName
   #      - On failure, the program will die as it's a bad internal bug to try to 
   #        register a duplicate command handler.
 #  #
 sub ApplyEdit {  sub register_handler {
     my $directive   = shift;      my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok)   = @_;
     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") {      #  Don't allow duplication#
  $editor->Append($p1);          # p1 - key p2 null.     
     } elsif ($command eq "replace") {      if (defined $Dispatcher{$request_name}) {
  $editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.   die "Attempting to define a duplicate request handler for $request_name\n";
     } elsif ($command eq "delete") {  
  $editor->DeleteLine($p1);         # p1 - key p2 null.  
     } else {          # Should not get here!!!  
  die "Invalid command given to ApplyEdit $command"  
     }      }
 }      #   Build the client type mask:
 #      
 # AdjustOurHost:      my $client_type_mask = 0;
 #           Adjusts a host file stored in a configuration file editor object      if($client_ok) {
 #           for the true IP address of this host. This is necessary for hosts   $client_type_mask  |= $CLIENT_OK;
 #           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 $myHostName";  
     }      }
     # figure out my IP:      if($manager_ok) {
     #   Use the config line to get my hostname.   $client_type_mask  |= $MANAGER_OK;
     #   Use gethostbyname to translate that into an IP address.  
     #  
     my ($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:     
       #  Enter the hash:
     $editor->ReplaceLine($id, $newConfigLine);        
           my @entry = ($procedure, $must_encode, $client_type_mask);
 }     
 #      $Dispatcher{$request_name} = \@entry;
 #   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 3264  sub catchexception { Line 3535  sub catchexception {
     $SIG{'QUIT'}='DEFAULT';      $SIG{'QUIT'}='DEFAULT';
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
     &status("Catching exception");      &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->[$error]</font>");
     &logthis('Famous last words: '.$status.' - '.$lastlog);      &logthis('Famous last words: '.$status.' - '.$lastlog);
Line 3272  sub catchexception { Line 3543  sub catchexception {
     $server->close();      $server->close();
     die($error);      die($error);
 }  }
   
 sub timeout {  sub timeout {
     &status("Handling Timeout");      &status("Handling Timeout");
     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
     &catchexception('Timeout');      &catchexception('Timeout');
 }  }
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
   
   
 $SIG{'QUIT'}=\&catchexception;  $SIG{'QUIT'}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   
Line 3327  $server = IO::Socket::INET->new(LocalPor Line 3598  $server = IO::Socket::INET->new(LocalPor
 # global variables  # global variables
   
 my %children               = ();       # keys are current child process IDs  my %children               = ();       # keys are current child process IDs
 my $children               = 0;        # current number of children  
   
 sub REAPER {                        # takes care of dead children  sub REAPER {                        # takes care of dead children
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     &status("Handling child death");      &status("Handling child death");
     my $pid = wait;      my $pid;
     if (defined($children{$pid})) {      do {
  &logthis("Child $pid died");   $pid = waitpid(-1,&WNOHANG());
  $children --;   if (defined($children{$pid})) {
  delete $children{$pid};      &logthis("Child $pid died");
     } else {      delete($children{$pid});
  &logthis("Unknown Child $pid died");   } elsif ($pid > 0) {
       &logthis("Unknown Child $pid died");
    }
       } while ( $pid > 0 );
       foreach my $child (keys(%children)) {
    $pid = waitpid($child,&WNOHANG());
    if ($pid > 0) {
       &logthis("Child $child - $pid looks like we missed it's death");
       delete($children{$pid});
    }
     }      }
     &status("Finished Handling child death");      &status("Finished Handling child death");
 }  }
Line 3350  sub HUNTSMAN {                      # si Line 3629  sub HUNTSMAN {                      # si
     &logthis("Free socket: ".shutdown($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");      &status("Done killing children");
     exit;                           # clean up with dignity      exit;                           # clean up with dignity
 }  }
Line 3360  sub HUPSMAN {                      # sig Line 3639  sub HUPSMAN {                      # sig
     &status("Killing children for restart (HUP)");      &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)");      &status("Restarting self (HUP)");
Line 3370  sub HUPSMAN {                      # sig Line 3649  sub HUPSMAN {                      # sig
 #  #
 #    Kill off hashes that describe the host table prior to re-reading it.  #    Kill off hashes that describe the host table prior to re-reading it.
 #    Hashes affected are:  #    Hashes affected are:
 #       %hostid, %hostdom %hostip  #       %hostid, %hostdom %hostip %hostdns.
 #  #
 sub KillHostHashes {  sub KillHostHashes {
     foreach my $key (keys %hostid) {      foreach my $key (keys %hostid) {
Line 3382  sub KillHostHashes { Line 3661  sub KillHostHashes {
     foreach my $key (keys %hostip) {      foreach my $key (keys %hostip) {
  delete $hostip{$key};   delete $hostip{$key};
     }      }
       foreach my $key (keys %hostdns) {
    delete $hostdns{$key};
       }
 }  }
 #  #
 #   Read in the host table from file and distribute it into the various hashes:  #   Read in the host table from file and distribute it into the various hashes:
Line 3392  sub KillHostHashes { Line 3674  sub KillHostHashes {
 sub ReadHostTable {  sub ReadHostTable {
   
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";      open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
           my $myloncapaname = $perlvar{'lonHostID'};
       Debug("My loncapa name is : $myloncapaname");
     while (my $configline=<CONFIG>) {      while (my $configline=<CONFIG>) {
  my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);   if (!($configline =~ /^\s*\#/)) {
  chomp($ip); $ip=~s/\D+$//;      my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
  $hostid{$ip}=$id;      chomp($ip); $ip=~s/\D+$//;
  $hostdom{$id}=$domain;      $hostid{$ip}=$id;         # LonCAPA name of host by IP.
  $hostip{$id}=$ip;      $hostdom{$id}=$domain;    # LonCAPA domain name of host. 
  if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }      $hostip{$id}=$ip;      # IP address of host.
       $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
   
       if ($id eq $perlvar{'lonHostID'}) { 
    Debug("Found me in the host table: $name");
    $thisserver=$name; 
       }
    }
     }      }
     close(CONFIG);      close(CONFIG);
 }  }
Line 3461  sub checkchildren { Line 3751  sub checkchildren {
     &logthis('Going to check on the children');      &logthis('Going to check on the children');
     my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
     foreach (sort keys %children) {      foreach (sort keys %children) {
  sleep 1;   #sleep 1;
         unless (kill 'USR1' => $_) {          unless (kill 'USR1' => $_) {
     &logthis ('Child '.$_.' is dead');      &logthis ('Child '.$_.' is dead');
             &logstatus($$.' is dead');              &logstatus($$.' is dead');
       delete($children{$_});
         }           } 
     }      }
     sleep 5;      sleep 5;
     $SIG{ALRM} = sub { die "timeout" };      $SIG{ALRM} = sub { Debug("timeout"); 
          die "timeout";  };
     $SIG{__DIE__} = 'DEFAULT';      $SIG{__DIE__} = 'DEFAULT';
     &status("Checking on the children (waiting for reports)");      &status("Checking on the children (waiting for reports)");
     foreach (sort keys %children) {      foreach (sort keys %children) {
Line 3482  sub checkchildren { Line 3774  sub checkchildren {
     #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;      #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
     #$execdir=$perlvar{'lonDaemons'};      #$execdir=$perlvar{'lonDaemons'};
     #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;      #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
       delete($children{$_});
     alarm(0);      alarm(0);
   }    }
         }          }
Line 3489  sub checkchildren { Line 3782  sub checkchildren {
     $SIG{ALRM} = 'DEFAULT';      $SIG{ALRM} = 'DEFAULT';
     $SIG{__DIE__} = \&catchexception;      $SIG{__DIE__} = \&catchexception;
     &status("Finished checking children");      &status("Finished checking children");
       &logthis('Finished Checking children');
 }  }
   
 # --------------------------------------------------------------------- Logging  # --------------------------------------------------------------------- Logging
Line 3519  sub Debug { Line 3813  sub Debug {
 #     reply   - Text to send to client.  #     reply   - Text to send to client.
 #     request - Original request from client.  #     request - Original request from client.
 #  #
 #  Note: This increments Transactions  
 #  
 sub Reply {  sub Reply {
     alarm(120);      my ($fd, $reply, $request) = @_;
     my $fd      = shift;  
     my $reply   = shift;  
     my $request = shift;  
   
     print $fd $reply;      print $fd $reply;
     Debug("Request was $request  Reply was $reply");      Debug("Request was $request  Reply was $reply");
   
     $Transactions++;      $Transactions++;
     alarm(0);  
   
   
 }  }
   
   
 #  #
 #    Sub to report a failure.  #    Sub to report a failure.
 #    This function:  #    This function:
Line 3551  sub Reply { Line 3840  sub Reply {
 #    client:  #    client:
 #  #
 sub Failure {  sub Failure {
    my $fd      = shift;      my $fd      = shift;
    my $reply   = shift;      my $reply   = shift;
    my $request = shift;      my $request = shift;
         
    $Failures++;      $Failures++;
    Reply($fd, $reply, $request);      # That's simple eh?      Reply($fd, $reply, $request);      # That's simple eh?
 }  }
 # ------------------------------------------------------------------ Log status  # ------------------------------------------------------------------ Log status
   
 sub logstatus {  sub logstatus {
    &status("Doing logging");      &status("Doing logging");
    my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
    {      {
       my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");   my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
       print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";          print $fh $status."\n".$lastlog."\n".time."\n$keymode";
       $fh->close();          $fh->close();
    }      }
    &status("Finished londstatus.txt");      &status("Finished $$.txt");
    {      {
       my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");   open(LOG,">>$docdir/lon-status/londstatus.txt");
       print $fh $status."\n".$lastlog."\n".time;   flock(LOG,LOCK_EX);
       $fh->close();   print LOG $$."\t".$clientname."\t".$currenthostid."\t"
    }      .$status."\t".$lastlog."\t $keymode\n";
    ResetStatistics;   flock(DB,LOCK_UN);
    &status("Finished logging");   close(LOG);
          }
       &status("Finished logging");
 }  }
   
 sub initnewstatus {  sub initnewstatus {
Line 3598  sub status { Line 3888  sub status {
     my $what=shift;      my $what=shift;
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $status = "lond: $what $local ";      $status=$local.': '.$what;
     if($Transactions) {      $0='lond: '.$what.' '.$local;
        $status .= " Transactions: $Transactions Failed; $Failures";  
     }  
     $0=$status;  
 }  }
   
 # -------------------------------------------------------- Escape Special Chars  # -------------------------------------------------------- Escape Special Chars
Line 3635  sub reconlonc { Line 3922  sub reconlonc {
             kill USR1 => $loncpid;              kill USR1 => $loncpid;
         } else {          } else {
     &logthis(      &logthis(
               "<font color=red>CRITICAL: "                "<font color='red'>CRITICAL: "
              ."lonc at pid $loncpid not responding, giving up</font>");               ."lonc at pid $loncpid not responding, giving up</font>");
         }          }
     } else {      } else {
       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');        &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
     }      }
 }  }
   
Line 3680  sub reply { Line 3967  sub reply {
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
   
 sub sqlreply {  sub sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $answer=subsqlreply($cmd);      my $answer=&sub_sql_reply($cmd);
     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }      if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
     return $answer;      return $answer;
 }  }
   
 sub subsqlreply {  sub sub_sql_reply {
     my ($cmd)=@_;      my ($cmd)=@_;
     my $unixsock="mysqlsock";      my $unixsock="mysqlsock";
     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";      my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
Line 3743  my $execdir=$perlvar{'lonDaemons'}; Line 4030  my $execdir=$perlvar{'lonDaemons'};
 open (PIDSAVE,">$execdir/logs/lond.pid");  open (PIDSAVE,">$execdir/logs/lond.pid");
 print PIDSAVE "$$\n";  print PIDSAVE "$$\n";
 close(PIDSAVE);  close(PIDSAVE);
 &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");  &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
 &status('Starting');  &status('Starting');
   
   
Line 3761  $SIG{USR2} = \&UpdateHosts; Line 4048  $SIG{USR2} = \&UpdateHosts;
   
 ReadHostTable;  ReadHostTable;
   
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated  #   Accept connections.  When a connection comes in, it is validated
 #   and if good, a child process is created to process transactions  #   and if good, a child process is created to process transactions
Line 3777  while (1) { Line 4063  while (1) {
   
 sub make_new_child {  sub make_new_child {
     my $pid;      my $pid;
   #    my $cipher;     # Now global
     my $sigset;      my $sigset;
   
     $client = shift;      $client = shift;
Line 3798  sub make_new_child { Line 4085  sub make_new_child {
     #  the pid hash.      #  the pid hash.
     #      #
     my $caller = getpeername($client);      my $caller = getpeername($client);
     my ($port,$iaddr)=unpack_sockaddr_in($caller);      my ($port,$iaddr);
     $clientip=inet_ntoa($iaddr);      if (defined($caller) && length($caller) > 0) {
    ($port,$iaddr)=unpack_sockaddr_in($caller);
       } else {
    &logthis("Unable to determine who caller was, getpeername returned nothing");
       }
       if (defined($iaddr)) {
    $clientip  = inet_ntoa($iaddr);
    Debug("Connected with $clientip");
    $clientdns = gethostbyaddr($iaddr, AF_INET);
    Debug("Connected with $clientdns by name");
       } else {
    &logthis("Unable to determine clientip");
    $clientip='Unavailable';
       }
           
     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} = $clientip;          $children{$pid} = $clientip;
         $children++;  
         &status('Started child '.$pid);          &status('Started child '.$pid);
         return;          return;
     } else {      } else {
Line 3823  sub make_new_child { Line 4122  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;            # Now global
   #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
         &Authen::Krb5::init_ets();          &Authen::Krb5::init_ets();
   
Line 3832  sub make_new_child { Line 4131  sub make_new_child {
 # =============================================================================  # =============================================================================
             # do something with the connection              # do something with the connection
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
  # see if we know client and check for spoof IP by challenge   # see if we know client and 'check' for spoof IP by ineffective challenge
   
  ReadManagerTable; # May also be a manager!!   ReadManagerTable; # May also be a manager!!
   
Line 3850  sub make_new_child { Line 4149  sub make_new_child {
     $clientname = $managers{$clientip};      $clientname = $managers{$clientip};
  }   }
  my $clientok;   my $clientok;
   
  if ($clientrec || $ismanager) {   if ($clientrec || $ismanager) {
     &status("Waiting for init from $clientip $clientname");      &status("Waiting for init from $clientip $clientname");
     &logthis('<font color="yellow">INFO: Connection, '.      &logthis('<font color="yellow">INFO: Connection, '.
Line 3857  sub make_new_child { Line 4157  sub make_new_child {
   " ($clientname) connection type = $ConnectionType </font>" );    " ($clientname) connection type = $ConnectionType </font>" );
     &status("Connecting $clientip  ($clientname))");       &status("Connecting $clientip  ($clientname))"); 
     my $remotereq=<$client>;      my $remotereq=<$client>;
     $remotereq=~s/[^\w:]//g;      chomp($remotereq);
       Debug("Got init: $remotereq");
       my $inikeyword = split(/:/, $remotereq);
     if ($remotereq =~ /^init/) {      if ($remotereq =~ /^init/) {
  &sethost("sethost:$perlvar{'lonHostID'}");   &sethost("sethost:$perlvar{'lonHostID'}");
  my $challenge="$$".time;   #
  print $client "$challenge\n";   #  If the remote is attempting a local init... give that a try:
  &status(   #
  "Waiting for challenge reply from $clientip ($clientname)");    my ($i, $inittype) = split(/:/, $remotereq);
  $remotereq=<$client>;  
  $remotereq=~s/\W//g;   # If the connection type is ssl, but I didn't get my
  if ($challenge eq $remotereq) {   # certificate files yet, then I'll drop  back to 
     $clientok=1;   # insecure (if allowed).
     print $client "ok\n";  
    if($inittype eq "ssl") {
       my ($ca, $cert) = lonssl::CertificateFile;
       my $kfile       = lonssl::KeyFile;
       if((!$ca)   || 
          (!$cert) || 
          (!$kfile)) {
    $inittype = ""; # This forces insecure attempt.
    &logthis("<font color=\"blue\"> Certificates not "
    ."installed -- trying insecure auth</font>");
       } else { # SSL certificates are in place so
       } # Leave the inittype alone.
    }
   
    if($inittype eq "local") {
       my $key = LocalConnection($client, $remotereq);
       if($key) {
    Debug("Got local key $key");
    $clientok     = 1;
    my $cipherkey = pack("H32", $key);
    $cipher       = new IDEA($cipherkey);
    print $client "ok:local\n";
    &logthis('<font color="green"'
    . "Successful local authentication </font>");
    $keymode = "local"
       } else {
    Debug("Failed to get local key");
    $clientok = 0;
    shutdown($client, 3);
    close $client;
       }
    } elsif ($inittype eq "ssl") {
       my $key = SSLConnection($client);
       if ($key) {
    $clientok = 1;
    my $cipherkey = pack("H32", $key);
    $cipher       = new IDEA($cipherkey);
    &logthis('<font color="green">'
    ."Successfull ssl authentication with $clientname </font>");
    $keymode = "ssl";
        
       } else {
    $clientok = 0;
    close $client;
       }
      
  } else {   } else {
     &logthis(      my $ok = InsecureConnection($client);
      "<font color=blue>WARNING: $clientip did not reply challenge</font>");      if($ok) {
     &status('No challenge reply '.$clientip);   $clientok = 1;
    &logthis('<font color="green">'
    ."Successful insecure authentication with $clientname </font>");
    print $client "ok\n";
    $keymode = "insecure";
       } else {
    &logthis('<font color="yellow">'
     ."Attempted insecure connection disallowed </font>");
    close $client;
    $clientok = 0;
   
       }
  }   }
     } else {      } else {
  &logthis(   &logthis(
  "<font color=blue>WARNING: "   "<font color='blue'>WARNING: "
  ."$clientip failed to initialize: >$remotereq< </font>");   ."$clientip failed to initialize: >$remotereq< </font>");
  &status('No init '.$clientip);   &status('No init '.$clientip);
     }      }
       
  } else {   } else {
     &logthis(      &logthis(
      "<font color=blue>WARNING: Unknown client $clientip</font>");       "<font color='blue'>WARNING: Unknown client $clientip</font>");
     &status('Hung up on '.$clientip);      &status('Hung up on '.$clientip);
  }   }
    
  if ($clientok) {   if ($clientok) {
 # ---------------- New known client connecting, could mean machine online again  # ---------------- New known client connecting, could mean machine online again
           
Line 3896  sub make_new_child { Line 4256  sub make_new_child {
  }   }
  &reconlonc("$perlvar{'lonSockDir'}/$id");   &reconlonc("$perlvar{'lonSockDir'}/$id");
     }      }
     &logthis("<font color=green>Established connection: $clientname</font>");      &logthis("<font color='green'>Established connection: $clientname</font>");
     &status('Will listen to '.$clientname);      &status('Will listen to '.$clientname);
   
     ResetStatistics();  
   
 # ------------------------------------------------------------ Process requests  # ------------------------------------------------------------ Process requests
     my $KeepGoing = 1;      my $keep_going = 1;
     while ((my $userinput=GetRequest) && $KeepGoing) {      my $user_input;
  $KeepGoing = ProcessRequest($userinput);      while(($user_input = get_request) && $keep_going) {
 # -------------------------------------------------------------------- complete   alarm(120);
    Debug("Main: Got $user_input\n");
  &status('Listening to '.$clientname);   $keep_going = &process_request($user_input);
    alarm(0);
    &status('Listening to '.$clientname." ($keymode)");   
     }      }
   
 # --------------------------------------------- client unknown or fishy, refuse  # --------------------------------------------- client unknown or fishy, refuse
  } else {   }  else {
     print $client "refused\n";      print $client "refused\n";
     $client->close();      $client->close();
     &logthis("<font color=blue>WARNING: "      &logthis("<font color='blue'>WARNING: "
      ."Rejected client $clientip, closing connection</font>");       ."Rejected client $clientip, closing connection</font>");
  }   }
     }                   }            
           
 # =============================================================================  # =============================================================================
           
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color='red'>CRITICAL: "
      ."Disconnect from $clientip ($clientname)</font>");           ."Disconnect from $clientip ($clientname)</font>");    
           
           
Line 3943  sub make_new_child { Line 4303  sub make_new_child {
 #    user      - Name of the user for which the role is being put.  #    user      - Name of the user for which the role is being put.
 #    authtype  - The authentication type associated with the user.  #    authtype  - The authentication type associated with the user.
 #  #
 sub ManagePermissions  sub manage_permissions
 {  {
     my $request = shift;  
     my $domain  = shift;      my ($request, $domain, $user, $authtype) = @_;
     my $user    = shift;  
     my $authtype= shift;  
   
     # See if the request is of the form /$domain/_au      # See if the request is of the form /$domain/_au
     &logthis("ruequest is $request");  
     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...      if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
  my $execdir = $perlvar{'lonDaemons'};   my $execdir = $perlvar{'lonDaemons'};
  my $userhome= "/home/$user" ;   my $userhome= "/home/$user" ;
Line 3959  sub ManagePermissions Line 4316  sub ManagePermissions
  system("$execdir/lchtmldir $userhome $user $authtype");   system("$execdir/lchtmldir $userhome $user $authtype");
     }      }
 }  }
   
   
   #
   #  Return the full path of a user password file, whether it exists or not.
   # Parameters:
   #   domain     - Domain in which the password file lives.
   #   user       - name of the user.
   # Returns:
   #    Full passwd path:
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  sub password_path {
       my ($domain, $user) = @_;
   
   
       my $path   = &propath($domain, $user);
       $path  .= "/passwd";
   
       return $path;
   }
   
   #   Password Filename
   #   Returns the path to a passwd file given domain and user... only if
   #  it exists.
   # Parameters:
   #   domain    - Domain in which to search.
   #   user      - username.
   # Returns:
   #   - If the password file exists returns its path.
   #   - If the password file does not exist, returns undefined.
   #
   sub password_filename {
       my ($domain, $user) = @_;
   
       Debug ("PasswordFilename called: dom = $domain user = $user");
   
       my $path  = &password_path($domain, $user);
       Debug("PasswordFilename got path: $path");
       if(-e $path) {
    return $path;
       } else {
    return undef;
       }
   }
   
   #
   #   Rewrite the contents of the user's passwd file.
   #  Parameters:
   #    domain    - domain of the user.
   #    name      - User's name.
   #    contents  - New contents of the file.
   # Returns:
   #   0    - Failed.
   #   1    - Success.
   #
   sub rewrite_password_file {
       my ($domain, $user, $contents) = @_;
   
       my $file = &password_filename($domain, $user);
       if (defined $file) {
    my $pf = IO::File->new(">$file");
    if($pf) {
       print $pf "$contents\n";
       return 1;
    } else {
       return 0;
    }
       } else {
    return 0;
       }
   
   }
   
   #
   #   get_auth_type - Determines the authorization type of a user in a domain.
   
 #     Returns the authorization type or nouser if there is no such user.  #     Returns the authorization type or nouser if there is no such user.
 #  #
 sub GetAuthType   sub get_auth_type 
 {  {
     my $domain = shift;  
     my $user   = shift;  
   
     Debug("GetAuthType( $domain, $user ) \n");      my ($domain, $user)  = @_;
   
       Debug("get_auth_type( $domain, $user ) \n");
     my $proname    = &propath($domain, $user);       my $proname    = &propath($domain, $user); 
     my $passwdfile = "$proname/passwd";      my $passwdfile = "$proname/passwd";
     if( -e $passwdfile ) {      if( -e $passwdfile ) {
Line 3985  sub GetAuthType Line 4414  sub GetAuthType
  }   }
   
  return "$authtype:$availinfo";   return "$authtype:$availinfo";
     }      } else {
     else {  
  Debug("Returning nouser");   Debug("Returning nouser");
  return "nouser";   return "nouser";
     }      }
 }  }
   
   #
   #  Validate a user given their domain, name and password.  This utility
   #  function is used by both  AuthenticateHandler and ChangePasswordHandler
   #  to validate the login credentials of a user.
   # Parameters:
   #    $domain    - The domain being logged into (this is required due to
   #                 the capability for multihomed systems.
   #    $user      - The name of the user being validated.
   #    $password  - The user's propoposed password.
   #
   # Returns:
   #     1        - The domain,user,pasword triplet corresponds to a valid
   #                user.
   #     0        - The domain,user,password triplet is not a valid user.
   #
   sub validate_user {
       my ($domain, $user, $password) = @_;
   
   
       # Why negative ~pi you may well ask?  Well this function is about
       # authentication, and therefore very important to get right.
       # I've initialized the flag that determines whether or not I've 
       # validated correctly to a value it's not supposed to get.
       # At the end of this function. I'll ensure that it's not still that
       # value so we don't just wind up returning some accidental value
       # as a result of executing an unforseen code path that
       # did not set $validated.
   
       my $validated = -3.14159;
   
       #  How we authenticate is determined by the type of authentication
       #  the user has been assigned.  If the authentication type is
       #  "nouser", the user does not exist so we will return 0.
   
       my $contents = &get_auth_type($domain, $user);
       my ($howpwd, $contentpwd) = split(/:/, $contents);
   
       my $null = pack("C",0); # Used by kerberos auth types.
   
       if ($howpwd ne 'nouser') {
   
    if($howpwd eq "internal") { # Encrypted is in local password file.
       $validated = (crypt($password, $contentpwd) eq $contentpwd);
    }
    elsif ($howpwd eq "unix") { # User is a normal unix user.
       $contentpwd = (getpwnam($user))[1];
       if($contentpwd) {
    if($contentpwd eq 'x') { # Shadow password file...
       my $pwauth_path = "/usr/local/sbin/pwauth";
       open PWAUTH,  "|$pwauth_path" or
    die "Cannot invoke authentication";
       print PWAUTH "$user\n$password\n";
       close PWAUTH;
       $validated = ! $?;
   
    } else {         # Passwords in /etc/passwd. 
       $validated = (crypt($password,
    $contentpwd) eq $contentpwd);
    }
       } else {
    $validated = 0;
       }
    }
    elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
       if(! ($password =~ /$null/) ) {
    my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
      "",
      $contentpwd,,
      'krbtgt',
      $contentpwd,
      1,
      $password);
    if(!$k4error) {
       $validated = 1;
    } else {
       $validated = 0;
       &logthis('krb4: '.$user.', '.$contentpwd.', '.
        &Authen::Krb4::get_err_txt($Authen::Krb4::error));
    }
       } else {
    $validated = 0; # Password has a match with null.
       }
    } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
       if(!($password =~ /$null/)) { # Null password not allowed.
    my $krbclient = &Authen::Krb5::parse_name($user.'@'
     .$contentpwd);
    my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
    my $krbserver  = &Authen::Krb5::parse_name($krbservice);
    my $credentials= &Authen::Krb5::cc_default();
    $credentials->initialize($krbclient);
    my $krbreturn  = &Authen::KRb5::get_in_tkt_with_password($krbclient,
    $krbserver,
    $password,
    $credentials);
    $validated = ($krbreturn == 1);
       } else {
    $validated = 0;
       }
    } elsif ($howpwd eq "localauth") { 
       #  Authenticate via installation specific authentcation method:
       $validated = &localauth::localauth($user, 
          $password, 
          $contentpwd);
    } else { # Unrecognized auth is also bad.
       $validated = 0;
    }
       } else {
    $validated = 0;
       }
       #
       #  $validated has the correct stat of the authentication:
       #
   
       unless ($validated != -3.14159) {
    die "ValidateUser - failed to set the value of validated";
       }
       return $validated;
   }
   
   
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
Line 4012  sub addline { Line 4560  sub addline {
     return $found;      return $found;
 }  }
   
 sub getchat {  sub get_chat {
     my ($cdom,$cname,$udom,$uname)=@_;      my ($cdom,$cname,$udom,$uname)=@_;
     my %hash;      my %hash;
     my $proname=&propath($cdom,$cname);      my $proname=&propath($cdom,$cname);
Line 4037  sub getchat { Line 4585  sub getchat {
     return (@participants,@entries);      return (@participants,@entries);
 }  }
   
 sub chatadd {  sub chat_add {
     my ($cdom,$cname,$newchat)=@_;      my ($cdom,$cname,$newchat)=@_;
     my %hash;      my %hash;
     my $proname=&propath($cdom,$cname);      my $proname=&propath($cdom,$cname);
Line 4076  sub chatadd { Line 4624  sub chatadd {
 sub unsub {  sub unsub {
     my ($fname,$clientip)=@_;      my ($fname,$clientip)=@_;
     my $result;      my $result;
       my $unsubs = 0; # Number of successful unsubscribes:
   
   
       # An old way subscriptions were handled was to have a 
       # subscription marker file:
   
       Debug("Attempting unlink of $fname.$clientname");
     if (unlink("$fname.$clientname")) {      if (unlink("$fname.$clientname")) {
  $result="ok\n";   $unsubs++; # Successful unsub via marker file.
     } else {      } 
  $result="not_subscribed\n";  
     }      # The more modern way to do it is to have a subscription list
       # file:
   
     if (-e "$fname.subscription") {      if (-e "$fname.subscription") {
  my $found=&addline($fname,$clientname,$clientip,'');   my $found=&addline($fname,$clientname,$clientip,'');
  if ($found) { $result="ok\n"; }   if ($found) { 
       $unsubs++;
    }
       } 
   
       #  If either or both of these mechanisms succeeded in unsubscribing a 
       #  resource we can return ok:
   
       if($unsubs) {
    $result = "ok\n";
     } else {      } else {
  if ($result != "ok\n") { $result="not_subscribed\n"; }   $result = "not_subscribed\n";
     }      }
   
     return $result;      return $result;
 }  }
   
Line 4208  sub make_passwd_file { Line 4775  sub make_passwd_file {
  }   }
     } elsif ($umode eq 'unix') {      } elsif ($umode eq 'unix') {
  {   {
     my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";      #
       #  Don't allow the creation of privileged accounts!!! that would
       #  be real bad!!!
       #
       my $uid = getpwnam($uname);
       if((defined $uid) && ($uid == 0)) {
    &logthis(">>>Attempted to create privilged account blocked");
    return "no_priv_account_error\n";
       }
   
       my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
   
       my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
     {      {
  &Debug("Executing external: ".$execpath);   &Debug("Executing external: ".$execpath);
  &Debug("user  = ".$uname.", Password =". $npass);   &Debug("user  = ".$uname.", Password =". $npass);
Line 4216  sub make_passwd_file { Line 4795  sub make_passwd_file {
  print $se "$uname\n";   print $se "$uname\n";
  print $se "$npass\n";   print $se "$npass\n";
  print $se "$npass\n";   print $se "$npass\n";
    print $se "$lc_error_file\n"; # Status -> unique file.
     }      }
     my $useraddok = $?;      my $error = IO::File->new("< $lc_error_file");
       my $useraddok = <$error>;
       $error->close;
       unlink($lc_error_file);
   
       chomp $useraddok;
   
     if($useraddok > 0) {      if($useraddok > 0) {
  &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));   my $error_text = &lcuseraddstrerror($useraddok);
    &logthis("Failed lcuseradd: $error_text");
    $result = "lcuseradd_failed:$error_text\n";
       }  else {
    my $pf = IO::File->new(">$passfilename");
    print $pf "unix:\n";
     }      }
     my $pf = IO::File->new(">$passfilename");  
     print $pf "unix:\n";  
  }   }
     } elsif ($umode eq 'none') {      } elsif ($umode eq 'none') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new("> $passfilename");
     print $pf "none:\n";      print $pf "none:\n";
  }   }
     } else {      } else {
Line 4240  sub sethost { Line 4829  sub sethost {
     my (undef,$hostid)=split(/:/,$remotereq);      my (undef,$hostid)=split(/:/,$remotereq);
     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {      if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
  $currenthostid=$hostid;   $currenthostid  =$hostid;
  $currentdomainid=$hostdom{$hostid};   $currentdomainid=$hostdom{$hostid};
  &logthis("Setting hostid to $hostid, and domain to $currentdomainid");   &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {      } else {
Line 4256  sub version { Line 4845  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 4282  sub userload { Line 4869  sub userload {
     return $userloadpercent;      return $userloadpercent;
 }  }
   
   # Routines for serializing arrays and hashes (copies from lonnet)
   
   sub array2str {
     my (@array) = @_;
     my $result=&arrayref2str(\@array);
     $result=~s/^__ARRAY_REF__//;
     $result=~s/__END_ARRAY_REF__$//;
     return $result;
   }
                                                                                    
   sub arrayref2str {
     my ($arrayref) = @_;
     my $result='__ARRAY_REF__';
     foreach my $elem (@$arrayref) {
       if(ref($elem) eq 'ARRAY') {
         $result.=&arrayref2str($elem).'&';
       } elsif(ref($elem) eq 'HASH') {
         $result.=&hashref2str($elem).'&';
       } elsif(ref($elem)) {
         #print("Got a ref of ".(ref($elem))." skipping.");
       } else {
         $result.=&escape($elem).'&';
       }
     }
     $result=~s/\&$//;
     $result .= '__END_ARRAY_REF__';
     return $result;
   }
                                                                                    
   sub hash2str {
     my (%hash) = @_;
     my $result=&hashref2str(\%hash);
     $result=~s/^__HASH_REF__//;
     $result=~s/__END_HASH_REF__$//;
     return $result;
   }
                                                                                    
   sub hashref2str {
     my ($hashref)=@_;
     my $result='__HASH_REF__';
     foreach (sort(keys(%$hashref))) {
       if (ref($_) eq 'ARRAY') {
         $result.=&arrayref2str($_).'=';
       } elsif (ref($_) eq 'HASH') {
         $result.=&hashref2str($_).'=';
       } elsif (ref($_)) {
         $result.='=';
         #print("Got a ref of ".(ref($_))." skipping.");
       } else {
           if ($_) {$result.=&escape($_).'=';} else { last; }
       }
   
       if(ref($hashref->{$_}) eq 'ARRAY') {
         $result.=&arrayref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_}) eq 'HASH') {
         $result.=&hashref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_})) {
          $result.='&';
         #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
       } else {
         $result.=&escape($hashref->{$_}).'&';
       }
     }
     $result=~s/\&$//;
     $result .= '__END_HASH_REF__';
     return $result;
   }
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  # ----------------------------------- POD (plain old documentation, CPAN style)
   
 =head1 NAME  =head1 NAME
Line 4489  Place in B<logs/lond.log> Line 5144  Place in B<logs/lond.log>
   
 stores hash in namespace  stores hash in namespace
   
 =item rolesput  =item rolesputy
   
 put a role into a user's environment  put a role into a user's environment
   
Removed from v.1.178.2.2  
changed lines
  Added in v.1.235

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