Diff for /loncom/lond between versions 1.178.2.18 and 1.223

version 1.178.2.18, 2004/04/19 11:32:35 version 1.223, 2004/08/05 11:37:05
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 = 1;       # Non zero to enable debug log entries.
   
Line 55  my $lastlog=''; Line 59  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 161  sub isManager { Line 365  sub isManager {
 sub isClient {  sub isClient {
     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));      return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
 }  }
   
   
   #
   #   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.
            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, $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:
   #       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:
   #      Full path to the file or undef if the selector is invalid.
   #
   sub ConfigFileFromSelector {
       my $selector   = shift;
       my $tablefile;
   
       my $tabledir = $perlvar{'lonTabDir'}.'/';
       if ($selector eq "hosts") {
    $tablefile = $tabledir."hosts.tab";
       } elsif ($selector eq "domain") {
    $tablefile = $tabledir."domain.tab";
       } else {
    return undef;
       }
       return $tablefile;
   
   }
   #
   #   PushFile:  Called to do an administrative push of a file.
   #              - Ensure the file being pushed is one we support.
   #              - Backup the old file to <filename.saved>
   #              - Separate the contents of the new file out from the
   #                rest of the request.
   #              - Write the new file.
   #  Parameter:
   #     Request - The entire user request.  This consists of a : separated
   #               string pushfile:tablename:contents.
   #     NOTE:  The contents may have :'s in it as well making things a bit
   #            more interesting... but not much.
   #  Returns:
   #     String to send to client ("ok" or "refused" if bad file).
   #
   sub PushFile {
       my $request = shift;    
       my ($command, $filename, $contents) = split(":", $request, 3);
       
       #  At this point in time, pushes for only the following tables are
       #  supported:
       #   hosts.tab  ($filename eq host).
       #   domain.tab ($filename eq domain).
       # Construct the destination filename or reject the request.
       #
       # lonManage is supposed to ensure this, however this session could be
       # part of some elaborate spoof that managed somehow to authenticate.
       #
   
   
       my $tablefile = ConfigFileFromSelector($filename);
       if(! (defined $tablefile)) {
    return "refused";
       }
       #
       # >copy< the old table to the backup table
       #        don't rename in case system crashes/reboots etc. in the time
       #        window between a rename and write.
       #
       my $backupfile = $tablefile;
       $backupfile    =~ s/\.tab$/.old/;
       if(!CopyFile($tablefile, $backupfile)) {
    &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
    return "error:$!";
       }
       &logthis('<font color="green"> Pushfile: backed up '
       .$tablefile." to $backupfile</font>");
       
       #  If the file being pushed is the host file, we adjust the entry for ourself so that the
       #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
       #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
       #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
       #  that possibilty.
   
       if($filename eq "host") {
    $contents = AdjustHostContents($contents);
       }
   
       #  Install the new file:
   
       if(!InstallFile($tablefile, $contents)) {
    &logthis('<font color="red"> Pushfile: unable to install '
    .$tablefile." $! </font>");
    return "error:$!";
       }
       else {
    &logthis('<font color="green"> Installed new '.$tablefile
    ."</font>");
   
       }
   
   
       #  Indicate success:
    
       return "ok";
   
   }
   
   #
   #  Called to re-init either lonc or lond.
   #
   #  Parameters:
   #    request   - The full request by the client.  This is of the form
   #                reinit:<process>  
   #                where <process> is allowed to be either of 
   #                lonc or lond
   #
   #  Returns:
   #     The string to be sent back to the client either:
   #   ok         - Everything worked just fine.
   #   error:why  - There was a failure and why describes the reason.
   #
   #
   sub ReinitProcess {
       my $request = shift;
   
   
       # separate the request (reinit) from the process identifier and
       # validate it producing the name of the .pid file for the process.
       #
       #
       my ($junk, $process) = split(":", $request);
       my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
       if($process eq 'lonc') {
    $processpidfile = $processpidfile."lonc.pid";
    if (!open(PIDFILE, "< $processpidfile")) {
       return "error:Open failed for $processpidfile";
    }
    my $loncpid = <PIDFILE>;
    close(PIDFILE);
    logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
    ."</font>");
    kill("USR2", $loncpid);
       } elsif ($process eq 'lond') {
    logthis('<font color="red"> Reinitializing self (lond) </font>');
    &UpdateHosts; # Lond is us!!
       } else {
    &logthis('<font color="yellow" Invalid reinit request for '.$process
    ."</font>");
    return "error:Invalid process identifier $process";
       }
       return 'ok';
   }
   #   Validate a line in a configuration file edit script:
   #   Validation includes:
   #     - Ensuring the command is valid.
   #     - Ensuring the command has sufficient parameters
   #   Parameters:
   #     scriptline - A line to validate (\n has been stripped for what it's worth).
   #
   #   Return:
   #      0     - Invalid scriptline.
   #      1     - Valid scriptline
   #  NOTE:
   #     Only the command syntax is checked, not the executability of the
   #     command.
   #
   sub isValidEditCommand {
       my $scriptline = shift;
   
       #   Line elements are pipe separated:
   
       my ($command, $key, $newline)  = split(/\|/, $scriptline);
       &logthis('<font color="green"> isValideditCommand checking: '.
        "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
       
       if ($command eq "delete") {
    #
    #   key with no newline.
    #
    if( ($key eq "") || ($newline ne "")) {
       return 0; # Must have key but no newline.
    } else {
       return 1; # Valid syntax.
    }
       } elsif ($command eq "replace") {
    #
    #   key and newline:
    #
    if (($key eq "") || ($newline eq "")) {
       return 0;
    } else {
       return 1;
    }
       } elsif ($command eq "append") {
    if (($key ne "") && ($newline eq "")) {
       return 1;
    } else {
       return 0;
    }
       } else {
    return 0; # Invalid command.
       }
       return 0; # Should not get here!!!
   }
   #
   #   ApplyEdit - Applies an edit command to a line in a configuration 
   #               file.  It is the caller's responsiblity to validate the
   #               edit line.
   #   Parameters:
   #      $directive - A single edit directive to apply.  
   #                   Edit directives are of the form:
   #                  append|newline      - Appends a new line to the file.
   #                  replace|key|newline - Replaces the line with key value 'key'
   #                  delete|key          - Deletes the line with key value 'key'.
   #      $editor   - A config file editor object that contains the
   #                  file being edited.
   #
   sub ApplyEdit {
   
       my ($directive, $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.  #  Ties a domain level resource file to a hash.
 #  If requested a history entry is created in the associated hist file.  #  If requested a history entry is created in the associated hist file.
Line 178  sub isClient { Line 958  sub isClient {
 #    Reference to a hash bound to the db file or alternatively undef  #    Reference to a hash bound to the db file or alternatively undef
 #    if the tie failed.  #    if the tie failed.
 #  #
 sub TieDomainHash {  sub tie_domain_hash {
     my $domain    = shift;      my ($domain,$namespace,$how,$loghead,$logtail) = @_;
     my $namespace = shift;  
     my $how       = shift;  
           
     # Filter out any whitespace in the domain name:      # Filter out any whitespace in the domain name:
           
Line 189  sub TieDomainHash { Line 967  sub TieDomainHash {
           
     # We have enough to go on to tie the hash:      # We have enough to go on to tie the hash:
           
     my $UserTopDir   = $perlvar{'lonUsersDir'};      my $user_top_dir   = $perlvar{'lonUsersDir'};
     my $DomainDir    = $UserTopDir."/$domain";      my $domain_dir     = $user_top_dir."/$domain";
     my $ResourceFile = $DomainDir."/$namespace.db";      my $resource_file  = $domain_dir."/$namespace.db";
     my %hash;      my %hash;
     if(tie(%hash, 'GDBM_File', $ResourceFile, $how, 0640)) {      if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
  if (scalar @_) { # Need to log the operation.   if (defined($loghead)) { # Need to log the operation.
     my $logFh = IO::File->new(">>$DomainDir/$namespace.hist");      my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
     if($logFh) {      if($logFh) {
  my $TimeStamp = time;   my $timestamp = time;
  my ($loghead, $logtail) = @_;   print $logFh "$loghead:$timestamp:$logtail\n";
  print $logFh "$loghead:$TimeStamp:$logtail\n";  
     }      }
       $logFh->close;
  }   }
  return \%hash; # Return the tied hash.   return \%hash; # Return the tied hash.
     }      } else {
     else {  
  return undef; # Tie failed.   return undef; # Tie failed.
     }      }
 }  }
Line 228  sub TieDomainHash { Line 1005  sub TieDomainHash {
 #   hash to which the database is tied.  It's up to the caller to untie.  #   hash to which the database is tied.  It's up to the caller to untie.
 #   undef if the has could not be tied.  #   undef if the has could not be tied.
 #  #
 sub TieUserHash {  sub tie_user_hash {
     my $domain      = shift;      my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
     my $user        = shift;  
     my $namespace   = shift;  
     my $how         = shift;  
       
     $namespace=~s/\//\_/g; # / -> _      $namespace=~s/\//\_/g; # / -> _
     $namespace=~s/\W//g; # whitespace eliminated.      $namespace=~s/\W//g; # whitespace eliminated.
     my $proname     = propath($domain, $user);      my $proname     = propath($domain, $user);
         
     # If this is a namespace for which a history is kept,  
     # make the history log entry:  
       
       
     unless ($namespace =~/^nohist\_/ && (scalar @_ > 0)) {  
  my $hfh = IO::File->new(">>$proname/$namespace.hist");   
  if($hfh) {  
     my $now = time;  
     my $loghead  = shift;  
     my $what    = shift;  
     print $hfh "$loghead:$now:$what\n";  
  }  
     }  
     #  Tie the database.      #  Tie the database.
           
     my %hash;      my %hash;
     if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",      if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
    $how, 0640)) {     $how, 0640)) {
  return \%hash;   # If this is a namespace for which a history is kept,
     }   # make the history log entry:    
     else {   if (($namespace =~/^nohist\_/) && (defined($loghead))) {
  return undef;      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";
 #   Get a Request:      }
 #   Gets a Request message from the client.  The transaction      $hfh->close;
 #   is defined as a 'line' of text.  We remove the new line  
 #   from the text line.    
 #     
 sub GetRequest {  
     my $input = <$client>;  
     chomp($input);  
   
     Debug("Request = $input\n");  
   
     &status('Processing '.$clientname.':'.$input);  
   
     return $input;  
 }  
 #  
 #   Decipher encoded traffic  
 #  Parameters:  
 #     input      - Encoded data.  
 #  Returns:  
 #     Decoded data or undef if encryption key was not yet negotiated.  
 #  Implicit input:  
 #     cipher  - This global holds the negotiated encryption key.  
 #  
 sub Decipher {  
     my $input  = shift;  
     my $output = '';  
      
      
     if($cipher) {  
  my($enc, $enclength, $encinput) = split(/:/, $input);  
  for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {  
     $output .=   
  $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));  
  }   }
  return substr($output, 0, $enclength);   return \%hash;
     } else {      } else {
  return undef;   return undef;
     }      }
 }  
   
 #  
 #   Register a command processor.  This function is invoked to register a sub  
 #   to process a request.  Once registered, the ProcessRequest sub can automatically  
 #   dispatch requests to an appropriate sub, and do the top level validity checking  
 #   as well:  
 #    - Is the keyword recognized.  
 #    - Is the proper client type attempting the request.  
 #    - Is the request encrypted if it has to be.  
 #   Parameters:  
 #    $RequestName         - Name of the request being registered.  
 #                           This is the command request that will match  
 #                           against the hash keywords to lookup the information  
 #                           associated with the dispatch information.  
 #    $Procedure           - Reference to a sub to call to process the request.  
 #                           All subs get called as follows:  
 #                             Procedure($cmd, $tail, $replyfd, $key)  
 #                             $cmd    - the actual keyword that invoked us.  
 #                             $tail   - the tail of the request that invoked us.  
 #                             $replyfd- File descriptor connected to the client  
 #    $MustEncode          - True if the request must be encoded to be good.  
 #    $ClientOk            - True if it's ok for a client to request this.  
 #    $ManagerOk           - True if it's ok for a manager to request this.  
 # Side effects:  
 #      - On success, the Dispatcher hash has an entry added for the key $RequestName  
 #      - On failure, the program will die as it's a bad internal bug to try to   
 #        register a duplicate command handler.  
 #  
 sub RegisterHandler {  
     my $RequestName    = shift;  
     my $Procedure      = shift;  
     my $MustEncode     = shift;  
     my $ClientOk       = shift;  
     my $ManagerOk      = shift;  
      
     #  Don't allow duplication#  
      
     if (defined $Dispatcher{$RequestName}) {  
  die "Attempting to define a duplicate request handler for $RequestName\n";  
     }  
     #   Build the client type mask:  
           
     my $ClientTypeMask = 0;  
     if($ClientOk) {  
  $ClientTypeMask  |= $CLIENT_OK;  
     }  
     if($ManagerOk) {  
  $ClientTypeMask  |= $MANAGER_OK;  
     }  
      
     #  Enter the hash:  
         
     my @entry = ($Procedure, $MustEncode, $ClientTypeMask);  
      
     $Dispatcher{$RequestName} = \@entry;  
      
      
 }  }
   
 #--------------------- Request Handlers --------------------------------------------  #--------------------- 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 383  sub RegisterHandler { Line 1058  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 408  RegisterHandler("ping", \&PingHandler, 0 Line 1086  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 438  RegisterHandler("pong", \&PongHandler, 0 Line 1119  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.$$.int(rand 100000);      my $buildkey=time.$$.int(rand 100000);
     $buildkey=~tr/1-6/A-F/;      $buildkey=~tr/1-6/A-F/;
Line 454  sub EstablishKeyHandler { Line 1133  sub EstablishKeyHandler {
     $key=substr($key,0,32);      $key=substr($key,0,32);
     my $cipherkey=pack("H32",$key);      my $cipherkey=pack("H32",$key);
     $cipher=new IDEA $cipherkey;      $cipher=new IDEA $cipherkey;
     Reply($replyfd, "$buildkey\n", "$cmd:$tail");       &Reply($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 478  RegisterHandler("ekey", \&EstablishKeyHa Line 1157  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
Line 494  sub LoadHandler { Line 1171  sub LoadHandler {
         
     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 521  RegisterHandler("load", \&LoadHandler, 0 Line 1197  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 546  RegisterHandler("userload", \&UserLoadHa Line 1220  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", $userinput);
     } else {      } else {
  #   #
  # We only want to pass the second field from GetAuthType   # We only want to pass the second field from get_auth_type
  # for ^krb.. otherwise we'll be handing out the encrypted   # for ^krb.. otherwise we'll be handing out the encrypted
  # password for internals e.g.   # password for internals e.g.
  #   #
Line 570  sub UserAuthorizationType { Line 1242  sub UserAuthorizationType {
  if($type =~ /^krb/) {   if($type =~ /^krb/) {
     $type = $result;      $type = $result;
  }   }
  Reply( $replyfd, "$type\n", $userinput);   &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 591  RegisterHandler("currentauth", \&UserAut Line 1263  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";
   
Line 602  sub PushFileHandler { Line 1272  sub PushFileHandler {
     # the code below is a hook to do further authentication (e.g. to resolve      # the code below is a hook to do further authentication (e.g. to resolve
     # spoofing).      # 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 633  RegisterHandler("pushfile", \&PushFileHa Line 1304  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 667  RegisterHandler("reinit", \&ReinitProces Line 1336  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 721  RegisterHandler("edit", \&EditTableHandl Line 1388  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       #  Regenerate the full input line 
           
Line 735  sub AuthenticateHandler { Line 1401  sub AuthenticateHandler {
     #  upass   - User's password.      #  upass   - User's password.
           
     my ($udom,$uname,$upass)=split(/:/,$tail);      my ($udom,$uname,$upass)=split(/:/,$tail);
     Debug(" Authenticate domain = $udom, user = $uname, password = $upass");      &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
     chomp($upass);      chomp($upass);
     $upass=unescape($upass);      $upass=&unescape($upass);
   
     my $pwdcorrect = ValidateUser($udom, $uname, $upass);      my $pwdcorrect = &validate_user($udom, $uname, $upass);
     if($pwdcorrect) {      if($pwdcorrect) {
  Reply( $client, "authorized\n", $userinput);   &Reply( $client, "authorized\n", $userinput);
  #   #
  #  Bad credentials: Failed to authorize   #  Bad credentials: Failed to authorize
  #   #
     } else {      } else {
  Failure( $client, "non_authorized\n", $userinput);   &Failure( $client, "non_authorized\n", $userinput);
     }      }
   
     return 1;      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 774  RegisterHandler("auth", \&AuthenticateHa Line 1441  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.
   
     #      #
Line 788  sub ChangePasswordHandler { Line 1453  sub ChangePasswordHandler {
     #  npass - New password.      #  npass - New password.
         
     my ($udom,$uname,$upass,$npass)=split(/:/,$tail);      my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
     chomp($npass);  
     $upass=&unescape($upass);      $upass=&unescape($upass);
     $npass=&unescape($npass);      $npass=&unescape($npass);
     &Debug("Trying to change password for $uname");      &Debug("Trying to change password for $uname");
Line 796  sub ChangePasswordHandler { Line 1461  sub ChangePasswordHandler {
     # First require that the user can be authenticated with their      # First require that the user can be authenticated with their
     # old password:      # old password:
   
     my $validated = ValidateUser($udom, $uname, $upass);      my $validated = &validate_user($udom, $uname, $upass);
     if($validated) {      if($validated) {
  my $realpasswd  = GetAuthType($udom, $uname); # Defined since authd.   my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
   
  my ($howpwd,$contentpwd)=split(/:/,$realpasswd);   my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
  if ($howpwd eq 'internal') {   if ($howpwd eq 'internal') {
Line 806  sub ChangePasswordHandler { Line 1471  sub ChangePasswordHandler {
     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,$salt);
     if(RewritePwFile($udom, $uname, "internal:$ncpass")) {      if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
  &logthis("Result of password change for "   &logthis("Result of password change for "
  ."$uname: pwchange_success");   ."$uname: pwchange_success");
  Reply($client, "ok\n", $userinput);   &Reply($client, "ok\n", $userinput);
     } else {      } else {
  &logthis("Unable to open $uname passwd "                  &logthis("Unable to open $uname passwd "               
  ."to change password");   ."to change password");
  Failure( $client, "non_authorized\n",$userinput);   &Failure( $client, "non_authorized\n",$userinput);
     }      }
  } elsif ($howpwd eq 'unix') {   } elsif ($howpwd eq 'unix') {
     # Unix means we have to access /etc/password      # Unix means we have to access /etc/password
Line 829  sub ChangePasswordHandler { Line 1494  sub ChangePasswordHandler {
     my $result = ($err>0 ? 'pwchange_failure' : 'ok');      my $result = ($err>0 ? 'pwchange_failure' : 'ok');
     &logthis("Result of password change for $uname: ".      &logthis("Result of password change for $uname: ".
      &lcpasswdstrerror($?));       &lcpasswdstrerror($?));
     Reply($client, "$result\n", $userinput);      &Reply($client, "$result\n", $userinput);
  } else {   } else {
     # this just means that the current password mode is not      # this just means that the current password mode is not
     # one we know how to change (e.g the kerberos auth modes or      # one we know how to change (e.g the kerberos auth modes or
     # locally written auth handler).      # locally written auth handler).
     #      #
     Reply( $client, "auth_mode_error\n", $userinput);      &Failure( $client, "auth_mode_error\n", $userinput);
  }     }  
   
     }      }
     else {      else {
  Reply( $client, "non_authorized\n", $userinput);   &Failure( $client, "non_authorized\n", $userinput);
     }      }
   
     return 1;      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.  #   Getting, decoding and dispatching requests:
 #   The user must either already exist in some authentication realm  
 #   like kerberos or the /etc/passwd.  If not, a user completely local to  
 #   this loncapa system is created.  
 #  #
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 sub AddUserHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);  
     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.  
   
     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);  #
   #   Get a Request:
   #   Gets a Request message from the client.  The transaction
   #   is defined as a 'line' of text.  We remove the new line
   #   from the text line.  
   #   
   sub get_request {
       my $input = <$client>;
       chomp($input);
   
       Debug("get_request: Request = $input\n");
   
     if($udom eq $currentdomainid) { # Reject new users for other domains...      &status('Processing '.$clientname.':'.$input);
   
  my $oldumask=umask(0077);  
  chomp($npass);  
  $npass=&unescape($npass);  
  my $passfilename  = PasswordPath($udom, $uname);  
  &Debug("Password file created will be:".$passfilename);  
  if (-e $passfilename) {  
     Failure( $client, "already_exists\n", $userinput);  
  } else {  
     my @fpparts=split(/\//,$passfilename);  
     my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];  
     my $fperror='';  
     for (my $i=3;$i<= ($#fpparts-1);$i++) {  
  $fpnow.='/'.$fpparts[$i];   
  unless (-e $fpnow) {  
     &logthis("mkdir $fpnow");  
     unless (mkdir($fpnow,0777)) {  
  $fperror="error: ".($!+0)." mkdir failed while attempting "  
     ."makeuser";  
     }  
  }  
     }  
     unless ($fperror) {  
  my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);  
  Reply($client, $result, $userinput);     #BUGBUG - could be fail  
     } else {  
  Failure($client, "$fperror\n", $userinput);  
     }  
  }  
  umask($oldumask);  
     }  else {  
  Failure($client, "not_right_domain\n",  
  $userinput); # Even if we are multihomed.  
       
     }  
     return 1;  
   
       return $input;
 }  }
 RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);  #---------------------------------------------------------------
   
 #  #
 #   Change the authentication method of a user.  Note that this may  #  Process a request.  This sub should shrink as each action
 #   also implicitly change the user's password if, for example, the user is  #  gets farmed out into a separat sub that is registered 
 #   joining an existing authentication realm.  Known authentication realms at  #  with the dispatch hash.  
 #   this time are:  
 #    internal   - Purely internal password file (only loncapa knows this user)  
 #    local      - Institutionally written authentication module.  
 #    unix       - Unix user (/etc/passwd with or without /etc/shadow).  
 #    kerb4      - kerberos version 4  
 #    kerb5      - kerberos version 5  
 #  #
 # Parameters:  # Parameters:
 #    $cmd      - The command that got us here.  #    user_input   - The request received from the client (lonc).
 #    $tail     - Tail of the command (remaining parameters).  # Returns:
 #    $client   - File descriptor connected to client.  #    true to keep processing, false if caller should exit.
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 #  #
 sub ChangeAuthenticationHandler {  sub process_request {
     my $cmd     = shift;      my ($userinput) = @_;      # Easier for now to break style than to
     my $tail    = shift;                                  # fix all the userinput -> user_input.
     my $client  = shift;      my $wasenc    = 0; # True if request was encrypted.
      # ------------------------------------------------------------ See if encrypted
     my $userinput  = "$cmd:$tail";              # Reconstruct user input.      if ($userinput =~ /^enc/) {
    $userinput = decipher($userinput);
     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);   $wasenc=1;
     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);   if(!$userinput) { # Cipher not defined.
     if ($udom ne $currentdomainid) {      &Failure($client, "error: Encrypted data without negotated key");
  Failure( $client, "not_right_domain\n", $client);      return 0;
     } else {  
   
  chomp($npass);  
   
  $npass=&unescape($npass);  
  my $passfilename = PasswordPath($udom, $uname);  
  if ($passfilename) { # Not allowed to create a new user!!  
     my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);  
     Reply($client, $result, $userinput);  
  } else {         
     Failure($client, "non_authorized", $userinput); # Fail the user now.  
  }   }
     }      }
     return 1;      Debug("process_request: $userinput\n");
 }      
 RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);      #  
       #   The 'correct way' to add a command to lond is now to
       #   write a sub to execute it and Add it to the command dispatch
       #   hash via a call to register_handler..  The comments to that
       #   sub should give you enough to go on to show how to do this
       #   along with the examples that are building up as this code
       #   is getting refactored.   Until all branches of the
       #   if/elseif monster below have been factored out into
       #   separate procesor subs, if the dispatch hash is missing
       #   the command keyword, we will fall through to the remainder
       #   of the if/else chain below in order to keep this thing in 
       #   working order throughout the transmogrification.
   
 #      my ($command, $tail) = split(/:/, $userinput, 2);
 #   Determines if this is the home server for a user.  The home server      chomp($command);
 #   for a user will have his/her lon-capa passwd file.  Therefore all we need      chomp($tail);
 #   to do is determine if this file exists.      $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
 #      $command =~ s/(\r)//; # And this too for parameterless commands.
 # Parameters:      if(!$tail) {
 #    $cmd      - The command that got us here.   $tail =""; # defined but blank.
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 #  
 sub IsHomeHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
      
     my $userinput  = "$cmd:$tail";  
      
     my ($udom,$uname)=split(/:/,$tail);  
     chomp($uname);  
     my $passfile = PasswordFilename($udom, $uname);  
     if($passfile) {  
  Reply( $client, "found\n", $userinput);  
     } else {  
  Failure($client, "not_found\n", $userinput);  
     }      }
     return 1;  
 }      &Debug("Command received: $command, encoded = $wasenc");
 RegisterHandler("home", \&IsHomeHandler, 0,1,0);  
 #      if(defined $Dispatcher{$command}) {
 #   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.   my $dispatch_info = $Dispatcher{$command};
 #   If the resource is not local, then we must update, or at least invalidate our   my $handler       = $$dispatch_info[0];
 #   cached copy of the resource.    my $need_encode   = $$dispatch_info[1];
 #   FUTURE WORK:   my $client_types  = $$dispatch_info[2];
 #      I need to look at this logic carefully.  My druthers would be to follow   Debug("Matched dispatch hash: mustencode: $need_encode "
 #      typical caching logic, and simple invalidate the cache, drop any subscription        ."ClientType $client_types");
 #      an let the next fetch start the ball rolling again... however that may        
 #      actually be more difficult than it looks given the complex web of   #  Validate the request:
 #      proxy servers.        
 # Parameters:   my $ok = 1;
 #    $cmd      - The command that got us here.   my $requesterprivs = 0;
 #    $tail     - Tail of the command (remaining parameters).   if(&isClient()) {
 #    $client   - File descriptor connected to client.      $requesterprivs |= $CLIENT_OK;
 # Returns   }
 #     0        - Requested to exit, caller should shut down.   if(&isManager()) {
 #     1        - Continue processing.      $requesterprivs |= $MANAGER_OK;
 # Implicit inputs:   }
 #    The authentication systems describe above have their own forms of implicit   if($need_encode && (!$wasenc)) {
 #    input into the authentication process that are described above.      Debug("Must encode but wasn't: $need_encode $wasenc");
 #      $ok = 0;
 sub UpdateResourceHandler {   }
     my $cmd    = shift;   if(($client_types & $requesterprivs) == 0) {
     my $tail   = shift;      Debug("Client not privileged to do this operation");
     my $client = shift;      $ok = 0;
       }
     my $userinput = "$cmd:$tail";  
       if($ok) {
     my $fname=$tail;      Debug("Dispatching to handler $command $tail");
     my $ownership=ishome($fname);      my $keep_going = &$handler($command, $tail, $client);
     if ($ownership eq 'not_owner') {      return $keep_going;
  if (-e $fname) {   } else {
     my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,      Debug("Refusing to dispatch because client did not match requirements");
  $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);      Failure($client, "refused\n", $userinput);
     my $now=time;      return 1;
     my $since=$now-$atime;   }
     if ($since>$perlvar{'lonExpire'}) {  
  my $reply=&reply("unsub:$fname","$clientname");      }    
  unlink("$fname");  
   #------------------- Commands not yet in spearate handlers. --------------
   
   
   
   # -------------------------------------------------------------------- makeuser
       if ($userinput =~ /^makeuser/) { # encoded and client.
    &Debug("Make user received");
    my $oldumask=umask(0077);
    if (($wasenc==1) && isClient) {
       my 
    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
       &Debug("cmd =".$cmd." $udom =".$udom.
      " uname=".$uname);
       chomp($npass);
       $npass=&unescape($npass);
       my $proname=propath($udom,$uname);
       my $passfilename="$proname/passwd";
       &Debug("Password file created will be:".
      $passfilename);
       if (-e $passfilename) {
    print $client "already_exists\n";
       } elsif ($udom ne $currentdomainid) {
    print $client "not_right_domain\n";
     } else {      } else {
  my $transname="$fname.in.transfer";   my @fpparts=split(/\//,$proname);
  my $remoteurl=&reply("sub:$fname","$clientname");   my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
    my $fperror='';
    for (my $i=3;$i<=$#fpparts;$i++) {
       $fpnow.='/'.$fpparts[$i]; 
       unless (-e $fpnow) {
    unless (mkdir($fpnow,0777)) {
       $fperror="error: ".($!+0)
    ." mkdir failed while attempting "
    ."makeuser";
    }
       }
    }
    unless ($fperror) {
       my $result=&make_passwd_file($uname, $umode,$npass,
    $passfilename);
       print $client $result;
    } else {
       print $client "$fperror\n";
    }
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
    }
    umask($oldumask);
   # -------------------------------------------------------------- changeuserauth
       } elsif ($userinput =~ /^changeuserauth/) { # encoded & client
    &Debug("Changing authorization");
    if (($wasenc==1) && isClient) {
       my 
    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
       chomp($npass);
       &Debug("cmd = ".$cmd." domain= ".$udom.
      "uname =".$uname." umode= ".$umode);
       $npass=&unescape($npass);
       my $proname=&propath($udom,$uname);
       my $passfilename="$proname/passwd";
       if ($udom ne $currentdomainid) {
    print $client "not_right_domain\n";
       } else {
    my $result=&make_passwd_file($uname, $umode,$npass,
        $passfilename);
    Reply($client, $result, $userinput);
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
    }
   # ------------------------------------------------------------------------ home
       } elsif ($userinput =~ /^home/) { # client clear or encoded
    if(isClient) {
       my ($cmd,$udom,$uname)=split(/:/,$userinput);
       chomp($uname);
       my $proname=propath($udom,$uname);
       if (-e $proname) {
    print $client "found\n";
       } else {
    print $client "not_found\n";
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
    }
   # ---------------------------------------------------------------------- update
       } elsif ($userinput =~ /^update/) { # client clear or encoded.
    if(isClient) {
       my ($cmd,$fname)=split(/:/,$userinput);
       my $ownership=ishome($fname);
       if ($ownership eq 'not_owner') {
    if (-e $fname) {
       my ($dev,$ino,$mode,$nlink,
    $uid,$gid,$rdev,$size,
    $atime,$mtime,$ctime,
    $blksize,$blocks)=stat($fname);
       my $now=time;
       my $since=$now-$atime;
       if ($since>$perlvar{'lonExpire'}) {
    my $reply=
       &reply("unsub:$fname","$clientname");
       unlink("$fname");
       } else {
    my $transname="$fname.in.transfer";
    my $remoteurl=
       &reply("sub:$fname","$clientname");
    my $response;
    {
       my $ua=new LWP::UserAgent;
       my $request=new HTTP::Request('GET',"$remoteurl");
       $response=$ua->request($request,$transname);
    }
    if ($response->is_error()) {
       unlink($transname);
       my $message=$response->status_line;
       &logthis(
        "LWP GET: $message for $fname ($remoteurl)");
    } else {
       if ($remoteurl!~/\.meta$/) {
    my $ua=new LWP::UserAgent;
    my $mrequest=
       new HTTP::Request('GET',$remoteurl.'.meta');
    my $mresponse=
       $ua->request($mrequest,$fname.'.meta');
    if ($mresponse->is_error()) {
       unlink($fname.'.meta');
    }
       }
       rename($transname,$fname);
    }
       }
       print $client "ok\n";
    } else {
       print $client "not_found\n";
    }
       } else {
    print $client "rejected\n";
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
    }
   # -------------------------------------- fetch a user file from a remote server
       } elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
    if(isClient) {
       my ($cmd,$fname)=split(/:/,$userinput);
       my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
       my $udir=propath($udom,$uname).'/userfiles';
       unless (-e $udir) { mkdir($udir,0770); }
       if (-e $udir) {
    $ufile=~s/^[\.\~]+//;
    my $path = $udir;
    if ($ufile =~m|(.+)/([^/]+)$|) {
       my @parts=split('/',$1);
       foreach my $part (@parts) {
    $path .= '/'.$part;
    if ((-e $path)!=1) {
       mkdir($path,0770);
    }
       }
    }
    my $destname=$udir.'/'.$ufile;
    my $transname=$udir.'/'.$ufile.'.in.transit';
    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
  my $response;   my $response;
  alarm(120);  
  {   {
     my $ua=new LWP::UserAgent;      my $ua=new LWP::UserAgent;
     my $request=new HTTP::Request('GET',"$remoteurl");      my $request=new HTTP::Request('GET',"$remoteurl");
     $response=$ua->request($request,$transname);      $response=$ua->request($request,$transname);
  }   }
  alarm(0);  
  if ($response->is_error()) {   if ($response->is_error()) {
     unlink($transname);      unlink($transname);
     my $message=$response->status_line;      my $message=$response->status_line;
     &logthis("LWP GET: $message for $fname ($remoteurl)");      &logthis("LWP GET: $message for $fname ($remoteurl)");
       print $client "failed\n";
  } else {   } else {
     if ($remoteurl!~/\.meta$/) {      if (!rename($transname,$destname)) {
  alarm(120);   &logthis("Unable to move $transname to $destname");
  {   unlink($transname);
     my $ua=new LWP::UserAgent;   print $client "failed\n";
     my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');      } else {
     my $mresponse=$ua->request($mrequest,$fname.'.meta');   print $client "ok\n";
     if ($mresponse->is_error()) {  
  unlink($fname.'.meta');  
     }  
  }  
  alarm(0);  
     }      }
     rename($transname,$fname);  
  }   }
       } else {
    print $client "not_home\n";
     }      }
     Reply( $client, "ok\n", $userinput);  
  } else {   } else {
     Failure($client, "not_found\n", $userinput);      Reply($client, "refused\n", $userinput);
  }   }
     } else {  # --------------------------------------------------------- remove a user file 
  Failure($client, "rejected\n", $userinput);      } elsif ($userinput =~ /^removeuserfile/) { # Client clear or enc.
     }   if(isClient) {
     return 1;      my ($cmd,$fname)=split(/:/,$userinput);
 }      my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
 RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);      &logthis("$udom - $uname - $ufile");
       if ($ufile =~m|/\.\./|) {
 #   # any files paths with /../ in them refuse 
 #   Fetch a user file from a remote server:   # to deal with
 # Parameters:   print $client "refused\n";
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub FetchUserFileHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
      
     my $userinput = "$cmd:$tail";  
     my $fname           = $tail;  
     my ($udom,$uname,$ufile)=split(/\//,$fname);  
     my $udir=propath($udom,$uname).'/userfiles';  
     unless (-e $udir) {  
  mkdir($udir,0770);   
     }  
     if (-e $udir) {  
  $ufile=~s/^[\.\~]+//;  
  $ufile=~s/\///g;  
  my $destname=$udir.'/'.$ufile;  
  my $transname=$udir.'/'.$ufile.'.in.transit';  
  my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;  
  my $response;  
  alarm(120);  
  {  
     my $ua=new LWP::UserAgent;  
     my $request=new HTTP::Request('GET',"$remoteurl");  
     $response=$ua->request($request,$transname);  
  }  
  alarm(0);  
  if ($response->is_error()) {  
     unlink($transname);  
     my $message=$response->status_line;  
     &logthis("LWP GET: $message for $fname ($remoteurl)");  
     Failure($client, "failed\n", $userinput);  
  } else {  
     if (!rename($transname,$destname)) {  
  &logthis("Unable to move $transname to $destname");  
  unlink($transname);  
  Failure($client, "failed\n", $userinput);  
     } else {      } else {
  Reply($client, "ok\n", $userinput);   my $udir=propath($udom,$uname);
     }   if (-e $udir) {
  }         my $file=$udir.'/userfiles/'.$ufile;
     } else {      if (-e $file) {
  Failure($client, "not_home\n", $userinput);   unlink($file);
     }   if (-e $file) {
     return 1;      print $client "failed\n";
 }   } else {
 RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);      print $client "ok\n";
 #   }
 #   Authenticate access to a user file.       } else {
 #   print $client "not_found\n";
 # Parameters:      }
 #    $cmd      - The command that got us here.   } else {
 #    $tail     - Tail of the command (remaining parameters).      print $client "not_home\n";
 #    $client   - File descriptor connected to client.   }
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 sub AuthenticateUserFileAccess {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
   
     my ($fname,$session)=split(/:/,$tail);  
     chomp($session);  
     my $reply='non_auth';  
     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {  
  while (my $line=<ENVIN>) {  
     if ($line=~/userfile\.$fname\=/) {   
  $reply='ok';   
     }      }
    } else {
       Reply($client, "refused\n", $userinput);
  }   }
  close(ENVIN);  # ------------------------------------------ authenticate access to a user file
  Reply($client, $reply."\n", $userinput);      } elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
     } else {   if(isClient) {
  Failure($client, "invalid_token\n", $userinput);      my ($cmd,$fname,$session)=split(/:/,$userinput);
     }      chomp($session);
     return 1;      my $reply='non_auth';
          if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
 }       $session.'.id')) {
 RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);   while (my $line=<ENVIN>) {
 #      if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
 #   Unsubscribe from a resource.      }
 #   close(ENVIN);
 # Parameters:   print $client $reply."\n";
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub UnsubscribeHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";  
       
     my $fname = $tail;  
     if (-e $fname) {  
  Reply($client, &unsub($client,$fname,$clientip), $userinput);  
     } else {  
  Failure($client, "not_found\n", $userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("unusb", \&UnsubscribeHandler, 0, 1, 0);  
   
 #   Subscribe to a resource  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub SubscribeHandler {  
     my $cmd        = shift;  
     my $tail       = shift;  
     my $client     = shift;  
     my $userinput  = "$cmd:$tail";  
   
     Reply( $client, &subscribe($userinput,$clientip), $userinput);  
   
     return 1;  
 }  
 RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);  
   
 #  
 #   Determine the version of a resource (?) Or is it return  
 #   the top version of the resource?  Not yet clear from the  
 #   code in currentversion.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub CurrentVersionHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";  
      
     my $fname   = $tail;  
     Reply( $client, &currentversion($fname)."\n", $userinput);  
     return 1;  
   
 }  
 RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);  
   
   
 #  Make an entry in a user's activity log.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub ActivityLogEntryHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";  
   
     my ($udom,$uname,$what)=split(/:/,$tail);  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/activity.log")) {   
  print $hfh "$now:$clientname:$what\n";  
  Reply( $client, "ok\n", $userinput);   
     } else {  
  Failure($client, "error: ".($!+0)." IO::File->new Failed "  
       ."while attempting log\n",   
       $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);  
 #  
 #   Put a namespace entry in a user profile hash.  
 #   My druthers would be for this to be an encrypted interaction too.  
 #   anything that might be an inadvertent covert channel about either  
 #   user authentication or user personal information....  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub PutUserProfileEntry {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
       
     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);  
     if ($namespace ne 'roles') {  
  chomp($what);  
  my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_WRCREAT(),"P",$what);  
  if($hashref) {  
     my @pairs=split(/\&/,$what);  
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  $hashref->{$key}=$value;  
     }  
     if (untie(%$hashref)) {  
  Reply( $client, "ok\n", $userinput);  
     } else {      } else {
  Failure($client, "error: ".($!+0)." untie(GDBM) failed ".   print $client "invalid_token\n";
  "while attempting put\n",   
  $userinput);  
     }      }
  } else {   } else {
     Failure( $client, "error: ".($!)." tie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
      "while attempting put\n", $userinput);      
  }   }
     } else {  # ----------------------------------------------------------------- unsubscribe
         Failure( $client, "refused\n", $userinput);      } elsif ($userinput =~ /^unsub/) {
     }   if(isClient) {
           my ($cmd,$fname)=split(/:/,$userinput);
     return 1;      if (-e $fname) {
 }   print $client &unsub($fname,$clientip);
 RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);  
   
 #   
 #   Increment a profile entry in the user history file.  
 #   The history contains keyword value pairs.  In this case,  
 #   The value itself is a pair of numbers.  The first, the current value  
 #   the second an increment that this function applies to the current  
 #   value.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub IncrementUserValueHandler {  
     my $cmd         = shift;  
     my $tail        = shift;  
     my $client      = shift;  
     my $userinput   = "$cmd:$tail";  
   
     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);  
     if ($namespace ne 'roles') {  
         chomp($what);  
  my $hashref = TieUserHash($udom, $uname,  
   $namespace, &GDBM_WRCREAT(),  
   "P",$what);  
  if ($hashref) {  
     my @pairs=split(/\&/,$what);  
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  # We could check that we have a number...  
  if (! defined($value) || $value eq '') {  
     $value = 1;  
  }  
  $hashref->{$key}+=$value;  
     }  
     if (untie(%$hashref)) {  
  Reply( $client, "ok\n", $userinput);  
     } else {      } else {
  Failure($client, "error: ".($!+0)." untie(GDBM) failed ".   print $client "not_found\n";
  "while attempting inc\n", $userinput);  
     }      }
  } else {   } else {
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting inc\n", $userinput);      
  }   }
     } else {  # ------------------------------------------------------------------- subscribe
  Failure($client, "refused\n", $userinput);      } elsif ($userinput =~ /^sub/) {
     }   if(isClient) {
           print $client &subscribe($userinput,$clientip);
     return 1;   } else {
 }      Reply($client, "refused\n", $userinput);
 RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0);      
 #  
 #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.  
 #   Each 'role' a user has implies a set of permissions.  Adding a new role  
 #   for a person grants the permissions packaged with that role  
 #   to that user when the role is selected.  
 #  
 # Parameters:  
 #    $cmd       - The command string (rolesput).  
 #    $tail      - The remainder of the request line.  For rolesput this  
 #                 consists of a colon separated list that contains:  
 #                 The domain and user that is granting the role (logged).  
 #                 The domain and user that is getting the role.  
 #                 The roles being granted as a set of & separated pairs.  
 #                 each pair a key value pair.  
 #    $client    - File descriptor connected to the client.  
 # Returns:  
 #     0         - If the daemon should exit  
 #     1         - To continue processing.  
 #  
 #  
 sub RolesPutHandler {  
     my $cmd        = shift;  
     my $tail       = shift;  
     my $client     = shift;  
     my $userinput  = "$cmd:$tail";  
   
     my ($exedom,$exeuser,$udom,$uname,$what)   =split(/:/,$tail);  
     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.  
    "what = ".$what);  
     my $namespace='roles';  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
       &GDBM_WRCREAT(), "P",  
       "$exedom:$exeuser:$what");  
     #  
     #  Log the attempt to set a role.  The {}'s here ensure that the file   
     #  handle is open for the minimal amount of time.  Since the flush  
     #  is done on close this improves the chances the log will be an un-  
     #  corrupted ordered thing.  
     if ($hashref) {  
  my @pairs=split(/\&/,$what);  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     &ManagePermissions($key, $udom, $uname,  
        &GetAuthType( $udom, $uname));  
     $hashref->{$key}=$value;  
  }   }
  if (untie($hashref)) {  # ------------------------------------------------------------- current version
     Reply($client, "ok\n", $userinput);      } elsif ($userinput =~ /^currentversion/) {
    if(isClient) {
       my ($cmd,$fname)=split(/:/,$userinput);
       print $client &currentversion($fname)."\n";
  } else {   } else {
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
      "while attempting rolesput\n", $userinput);      
  }   }
     } else {  # ------------------------------------------------------------------------- log
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^log/) {
  "while attempting rolesput\n", $userinput);   if(isClient) {
     }      my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
     return 1;      chomp($what);
 }      my $proname=propath($udom,$uname);
 RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0);  # Encoded client only.      my $now=time;
 #      {
 #   Deletes (removes) a role for a user.   This is equivalent to removing   my $hfh;
 #  a permissions package associated with the role from the user's profile.   if ($hfh=IO::File->new(">>$proname/activity.log")) { 
 #      print $hfh "$now:$clientname:$what\n";
 # Parameters:      print $client "ok\n"; 
 #     $cmd                 - The command (rolesdel)   } else {
 #     $tail                - The remainder of the request line. This consists      print $client "error: ".($!+0)
 #                             of:   ." IO::File->new Failed "
 #                             The domain and user requesting the change (logged)   ."while attempting log\n";
 #                             The domain and user being changed.   }
 #                             The roles being revoked.  These are shipped to us      }
 #                             as a bunch of & separated role name keywords.   } else {
 #     $client              - The file handle open on the client.      Reply($client, "refused\n", $userinput);
 # Returns:      
 #     1                    - Continue processing  
 #     0                    - Exit.  
 #  
 sub RolesDeleteHandler {  
     my $cmd          = shift;  
     my $tail         = shift;  
     my $client       = shift;  
     my $userinput    = "$cmd:$tail";  
      
     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);  
     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.  
    "what = ".$what);  
     my $namespace='roles';  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
       &GDBM_WRCREAT(), "D",  
       "$exedom:$exeuser:$what");  
       
     if ($hashref) {  
  my @rolekeys=split(/\&/,$what);  
   
  foreach my $key (@rolekeys) {  
     delete $hashref->{$key};  
  }   }
  if (untie(%$hashref)) {  # ------------------------------------------------------------------------- put
     Reply($client, "ok\n", $userinput);      } elsif ($userinput =~ /^put/) {
    if(isClient) {
       my ($cmd,$udom,$uname,$namespace,$what)
    =split(/:/,$userinput,5);
       $namespace=~s/\//\_/g;
       $namespace=~s/\W//g;
       if ($namespace ne 'roles') {
    chomp($what);
    my $proname=propath($udom,$uname);
    my $now=time;
    my @pairs=split(/\&/,$what);
    my %hash;
    if (tie(%hash,'GDBM_File',
    "$proname/$namespace.db",
    &GDBM_WRCREAT(),0640)) {
       unless ($namespace=~/^nohist\_/) {
    my $hfh;
    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
       }
       
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $hash{$key}=$value;
       }
       if (untie(%hash)) {
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) failed ".
       "while attempting put\n";
       }
    } else {
       print $client "error: ".($!)
    ." tie(GDBM) Failed ".
    "while attempting put\n";
    }
       } else {
    print $client "refused\n";
       }
  } else {   } else {
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
      "while attempting rolesdel\n", $userinput);      
  }   }
     } else {  # ------------------------------------------------------------------- inc
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^inc:/) {
  "while attempting rolesdel\n", $userinput);   if(isClient) {
     }      my ($cmd,$udom,$uname,$namespace,$what)
        =split(/:/,$userinput);
     return 1;      $namespace=~s/\//\_/g;
 }      $namespace=~s/\W//g;
 RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only      if ($namespace ne 'roles') {
    chomp($what);
 # Unencrypted get from a user's profile database.  See    my $proname=propath($udom,$uname);
 # GetProfileEntryEncrypted for a version that does end-to-end encryption.   my $now=time;
 # This function retrieves a keyed item from a specific named database in the   my @pairs=split(/\&/,$what);
 # user's directory.   my %hash;
 #   if (tie(%hash,'GDBM_File',
 # Parameters:   "$proname/$namespace.db",
 #   $cmd             - Command request keyword (get).   &GDBM_WRCREAT(),0640)) {
 #   $tail            - Tail of the command.  This is a colon separated list      unless ($namespace=~/^nohist\_/) {
 #                      consisting of the domain and username that uniquely   my $hfh;
 #                      identifies the profile,   if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
 #                      The 'namespace' which selects the gdbm file to       }
 #                      do the lookup in,       foreach my $pair (@pairs) {
 #                      & separated list of keys to lookup.  Note that   my ($key,$value)=split(/=/,$pair);
 #                      the values are returned as an & separated list too.   # We could check that we have a number...
 #   $client          - File descriptor open on the client.   if (! defined($value) || $value eq '') {
 # Returns:      $value = 1;
 #   1       - Continue processing.   }
 #   0       - Exit.   $hash{$key}+=$value;
 #      }
 sub GetProfileEntry {      if (untie(%hash)) {
     my $cmd      = shift;   print $client "ok\n";
     my $tail     = shift;      } else {
     my $client   = shift;   print $client "error: ".($!+0)
     my $userinput= "$cmd:$tail";      ." untie(GDBM) failed ".
          "while attempting inc\n";
     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);      }
     chomp($what);   } else {
     my $hashref = TieUserHash($udom, $uname, $namespace,      print $client "error: ".($!)
       &GDBM_READER());   ." tie(GDBM) Failed ".
     if ($hashref) {   "while attempting inc\n";
         my @queries=split(/\&/,$what);   }
         my $qresult='';      } else {
    print $client "refused\n";
  for (my $i=0;$i<=$#queries;$i++) {      }
     $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.   } else {
       Reply($client, "refused\n", $userinput);
       
  }   }
  $qresult=~s/\&$//;              # Remove trailing & from last lookup.  # -------------------------------------------------------------------- rolesput
  if (untie(%$hashref)) {      } elsif ($userinput =~ /^rolesput/) {
     Reply($client, "$qresult\n", $userinput);   if(isClient) {
       &Debug("rolesput");
       if ($wasenc==1) {
    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
       =split(/:/,$userinput);
    &Debug("cmd = ".$cmd." exedom= ".$exedom.
          "user = ".$exeuser." udom=".$udom.
          "what = ".$what);
    my $namespace='roles';
    chomp($what);
    my $proname=propath($udom,$uname);
    my $now=time;
    my @pairs=split(/\&/,$what);
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
       {
    my $hfh;
    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
       print $hfh "P:$now:$exedom:$exeuser:$what\n";
    }
       }
       
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    &ManagePermissions($key, $udom, $uname,
      &get_auth_type( $udom, 
    $uname));
    $hash{$key}=$value;
       }
       if (untie(%hash)) {
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting rolesput\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting rolesput\n";
       }
       } else {
    print $client "refused\n";
       }
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting get\n", $userinput);      
  }   }
     } else {  # -------------------------------------------------------------------- rolesdel
  if ($!+0 == 2) {               # +0 coerces errno -> number 2 is ENOENT      } elsif ($userinput =~ /^rolesdel/) {
     Failure($client, "error:No such file or ".   if(isClient) {
     "GDBM reported bad block error\n", $userinput);      &Debug("rolesdel");
  } else {                        # Some other undifferentiated err.      if ($wasenc==1) {
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".   my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
     "while attempting get\n", $userinput);      =split(/:/,$userinput);
    &Debug("cmd = ".$cmd." exedom= ".$exedom.
          "user = ".$exeuser." udom=".$udom.
          "what = ".$what);
    my $namespace='roles';
    chomp($what);
    my $proname=propath($udom,$uname);
    my $now=time;
    my @rolekeys=split(/\&/,$what);
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
       {
    my $hfh;
    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
       print $hfh "D:$now:$exedom:$exeuser:$what\n";
    }
       }
       foreach my $key (@rolekeys) {
    delete $hash{$key};
       }
       if (untie(%hash)) {
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting rolesdel\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting rolesdel\n";
    }
       } else {
    print $client "refused\n";
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
  }   }
     }  # ------------------------------------------------------------------------- get
     return 1;      } elsif ($userinput =~ /^get/) {
 }   if(isClient) {
 RegisterHandler("get", \&GetProfileEntry, 0,1,0);      my ($cmd,$udom,$uname,$namespace,$what)
 #   =split(/:/,$userinput);
 #  Process the encrypted get request.  Note that the request is sent      $namespace=~s/\//\_/g;
 #  in clear, but the reply is encrypted.  This is a small covert channel:      $namespace=~s/\W//g;
 #  information about the sensitive keys is given to the snooper.  Just not      chomp($what);
 #  information about the values of the sensitive key.  Hmm if I wanted to      my @queries=split(/\&/,$what);
 #  know these I'd snoop for the egets. Get the profile item names from them      my $proname=propath($udom,$uname);
 #  and then issue a get for them since there's no enforcement of the      my $qresult='';
 #  requirement of an encrypted get for particular profile items.  If I      my %hash;
 #  were re-doing this, I'd force the request to be encrypted as well as the      if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 #  reply.  I'd also just enforce encrypted transactions for all gets since   for (my $i=0;$i<=$#queries;$i++) {
 #  that would prevent any covert channel snooping.      $qresult.="$hash{$queries[$i]}&";
 #   }
 #  Parameters:   if (untie(%hash)) {
 #     $cmd               - Command keyword of request (eget).      $qresult=~s/\&$//;
 #     $tail              - Tail of the command.  See GetProfileEntry #                          for more information about this.      print $client "$qresult\n";
 #     $client            - File open on the client.   } else {
 #  Returns:      print $client "error: ".($!+0)
 #     1      - Continue processing   ." untie(GDBM) Failed ".
 #     0      - server should exit.   "while attempting get\n";
 sub GetProfileEntryEncrypted {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
      
     my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_READER());  
     if ($hashref) {  
         my @queries=split(/\&/,$what);  
         my $qresult='';  
  for (my $i=0;$i<=$#queries;$i++) {  
     $qresult.="$hashref->{$queries[$i]}&";  
  }  
  if (untie(%$hashref)) {  
     $qresult=~s/\&$//;  
     if ($cipher) {  
  my $cmdlength=length($qresult);  
  $qresult.="         ";  
  my $encqresult='';  
  for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {  
     $encqresult.= unpack("H16",   
  $cipher->encrypt(substr($qresult,  
  $encidx,  
  8)));  
  }   }
  Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);  
     } else {      } else {
  Failure( $client, "error:no_key\n", $userinput);   if ($!+0 == 2) {
       print $client "error:No such file or ".
    "GDBM reported bad block error\n";
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting get\n";
    }
     }      }
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting eget\n", $userinput);      
  }   }
     } else {  # ------------------------------------------------------------------------ eget
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^eget/) {
  "while attempting eget\n", $userinput);   if (isClient) {
     }      my ($cmd,$udom,$uname,$namespace,$what)
        =split(/:/,$userinput);
     return 1;      $namespace=~s/\//\_/g;
 }      $namespace=~s/\W//g;
 RegisterHandler("eget", \&GetProfileEntryEncrypted, 0, 1, 0);      chomp($what);
       my @queries=split(/\&/,$what);
 #      my $proname=propath($udom,$uname);
 #   Deletes a key in a user profile database.      my $qresult='';
 #         my %hash;
 #   Parameters:      if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 #       $cmd                  - Command keyword (del).   for (my $i=0;$i<=$#queries;$i++) {
 #       $tail                 - Command tail.  IN this case a colon      $qresult.="$hash{$queries[$i]}&";
 #                               separated list containing:   }
 #                               The domain and user that identifies uniquely   if (untie(%hash)) {
 #                               the identity of the user.      $qresult=~s/\&$//;
 #                               The profile namespace (name of the profile      if ($cipher) {
 #                               database file).   my $cmdlength=length($qresult);
 #                               & separated list of keywords to delete.   $qresult.="         ";
 #       $client              - File open on client socket.   my $encqresult='';
 # Returns:   for 
 #     1   - Continue processing      (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
 #     0   - Exit server.   $encqresult.=
 #      unpack("H16",
 #     $cipher->encrypt(substr($qresult,$encidx,8)));
       }
 sub DeleteProfileEntry {   print $client "enc:$cmdlength:$encqresult\n";
     my $cmd      = shift;      } else {
     my $tail     = shift;   print $client "error:no_key\n";
     my $client   = shift;      }
     my $userinput = "cmd:$tail";   } else {
       print $client "error: ".($!+0)
     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);   ." untie(GDBM) Failed ".
     chomp($what);   "while attempting eget\n";
     my $hashref = TieUserHash($udom, $uname, $namespace,   }
   &GDBM_WRCREAT(),      } else {
   "D",$what);   print $client "error: ".($!+0)
     if ($hashref) {      ." tie(GDBM) Failed ".
         my @keys=split(/\&/,$what);      "while attempting eget\n";
  foreach my $key (@keys) {      }
     delete($hashref->{$key});   } else {
       Reply($client, "refused\n", $userinput);
       
  }   }
  if (untie(%$hashref)) {  # ------------------------------------------------------------------------- del
     Reply($client, "ok\n", $userinput);      } elsif ($userinput =~ /^del/) {
    if(isClient) {
       my ($cmd,$udom,$uname,$namespace,$what)
    =split(/:/,$userinput);
       $namespace=~s/\//\_/g;
       $namespace=~s/\W//g;
       chomp($what);
       my $proname=propath($udom,$uname);
       my $now=time;
       my @keys=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
    unless ($namespace=~/^nohist\_/) {
       my $hfh;
       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "D:$now:$what\n"; }
    }
    foreach my $key (@keys) {
       delete($hash{$key});
    }
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting del\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting del\n";
       }
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting del\n", $userinput);      
  }   }
     } else {  # ------------------------------------------------------------------------ keys
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^keys/) {
  "while attempting del\n", $userinput);   if(isClient) {
     }      my ($cmd,$udom,$uname,$namespace)
     return 1;   =split(/:/,$userinput);
 }      $namespace=~s/\//\_/g;
 RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0);      $namespace=~s/\W//g;
 #      my $proname=propath($udom,$uname);
 #  List the set of keys that are defined in a profile database file.      my $qresult='';
 #  A successful reply from this will contain an & separated list of      my %hash;
 #  the keys.       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 # Parameters:   foreach my $key (keys %hash) {
 #     $cmd              - Command request (keys).      $qresult.="$key&";
 #     $tail             - Remainder of the request, a colon separated   }
 #                         list containing domain/user that identifies the   if (untie(%hash)) {
 #                         user being queried, and the database namespace      $qresult=~s/\&$//;
 #                         (database filename essentially).      print $client "$qresult\n";
 #     $client           - File open on the client.   } else {
 #  Returns:      print $client "error: ".($!+0)
 #    1    - Continue processing.   ." untie(GDBM) Failed ".
 #    0    - Exit the server.   "while attempting keys\n";
 #   }
 sub GetProfileKeys {      } else {
     my $cmd       = shift;   print $client "error: ".($!+0)
     my $tail      = shift;      ." tie(GDBM) Failed ".
     my $client    = shift;      "while attempting keys\n";
     my $userinput = "$cmd:$tail";      }
   
     my ($udom,$uname,$namespace)=split(/:/,$tail);  
     my $qresult='';  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_READER());  
     if ($hashref) {  
  foreach my $key (keys %$hashref) {  
     $qresult.="$key&";  
  }  
  if (untie(%$hashref)) {  
     $qresult=~s/\&$//;  
     Reply($client, "$qresult\n", $userinput);  
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting keys\n", $userinput);      
  }   }
     } else {  # ----------------------------------------------------------------- dumpcurrent
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^currentdump/) {
  "while attempting keys\n", $userinput);   if (isClient) {
     }      my ($cmd,$udom,$uname,$namespace)
       =split(/:/,$userinput);
     return 1;      $namespace=~s/\//\_/g;
 }      $namespace=~s/\W//g;
 RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);      my $qresult='';
 #      my $proname=propath($udom,$uname);
 #   Dump the contents of a user profile database.      my %hash;
 #   Note that this constitutes a very large covert channel too since      if (tie(%hash,'GDBM_File',
 #   the dump will return sensitive information that is not encrypted.      "$proname/$namespace.db",
 #   The naive security assumption is that the session negotiation ensures      &GDBM_READER(),0640)) {
 #   our client is trusted and I don't believe that's assured at present.      # Structure of %data:
 #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really   # $data{$symb}->{$parameter}=$value;
 #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.   # $data{$symb}->{'v.'.$parameter}=$version;
 #    # since $parameter will be unescaped, we do not
 #  Parameters:   # have to worry about silly parameter names...
 #     $cmd           - The command request keyword (currentdump).   my %data = ();
 #     $tail          - Remainder of the request, consisting of a colon   while (my ($key,$value) = each(%hash)) {
 #                      separated list that has the domain/username and      my ($v,$symb,$param) = split(/:/,$key);
 #                      the namespace to dump (database file).      next if ($v eq 'version' || $symb eq 'keys');
 #     $client        - file open on the remote client.      next if (exists($data{$symb}) && 
 # Returns:       exists($data{$symb}->{$param}) &&
 #     1    - Continue processing.       $data{$symb}->{'v.'.$param} > $v);
 #     0    - Exit the server.      $data{$symb}->{$param}=$value;
 #      $data{$symb}->{'v.'.$param}=$v;
 sub DumpProfileDatabase {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
      
     my ($udom,$uname,$namespace) = split(/:/,$tail);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_READER());  
     if ($hashref) {  
  # Structure of %data:  
  # $data{$symb}->{$parameter}=$value;  
  # $data{$symb}->{'v.'.$parameter}=$version;  
  # since $parameter will be unescaped, we do not  
   # have to worry about silly parameter names...  
   
         my $qresult='';  
  my %data = ();                     # A hash of anonymous hashes..  
  while (my ($key,$value) = each(%$hashref)) {  
     my ($v,$symb,$param) = split(/:/,$key);  
     next if ($v eq 'version' || $symb eq 'keys');  
     next if (exists($data{$symb}) &&   
      exists($data{$symb}->{$param}) &&  
      $data{$symb}->{'v.'.$param} > $v);  
     $data{$symb}->{$param}=$value;  
     $data{$symb}->{'v.'.$param}=$v;  
  }  
  if (untie(%$hashref)) {  
     while (my ($symb,$param_hash) = each(%data)) {  
  while(my ($param,$value) = each (%$param_hash)){  
     next if ($param =~ /^v\./);       # Ignore versions...  
     #  
     #   Just dump the symb=value pairs separated by &  
     #  
     $qresult.=$symb.':'.$param.'='.$value.'&';  
  }   }
    if (untie(%hash)) {
       while (my ($symb,$param_hash) = each(%data)) {
    while(my ($param,$value) = each (%$param_hash)){
       next if ($param =~ /^v\./);
       $qresult.=$symb.':'.$param.'='.$value.'&';
    }
       }
       chop($qresult);
       print $client "$qresult\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting currentdump\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting currentdump\n";
     }      }
     chop($qresult);  
     Reply($client , "$qresult\n", $userinput);  
  } else {   } else {
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
      "while attempting currentdump\n", $userinput);  
  }   }
     } else {  # ------------------------------------------------------------------------ dump
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^dump/) {
  "while attempting currentdump\n", $userinput);   if(isClient) {
     }      my ($cmd,$udom,$uname,$namespace,$regexp)
    =split(/:/,$userinput);
     return 1;      $namespace=~s/\//\_/g;
 }      $namespace=~s/\W//g;
 RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);      if (defined($regexp)) {
 #   $regexp=&unescape($regexp);
 #   Dump a profile database with an optional regular expression  
 #   to match against the keys.  In this dump, no effort is made  
 #   to separate symb from version information. Presumably the  
 #   databases that are dumped by this command are of a different  
 #   structure.  Need to look at this and improve the documentation of  
 #   both this and the currentdump handler.  
 # Parameters:  
 #    $cmd                     - The command keyword.  
 #    $tail                    - All of the characters after the $cmd:  
 #                               These are expected to be a colon  
 #                               separated list containing:  
 #                               domain/user - identifying the user.  
 #                               namespace   - identifying the database.  
 #                               regexp      - optional regular expression  
 #                                             that is matched against  
 #                                             database keywords to do  
 #                                             selective dumps.  
 #   $client                   - Channel open on the client.  
 # Returns:  
 #    1    - Continue processing.  
 # Side effects:  
 #    response is written to $client.  
 #  
 sub DumpWithRegexp {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);  
     if (defined($regexp)) {  
  $regexp=&unescape($regexp);  
     } else {  
  $regexp='.';  
     }  
     my $hashref =TieUserHash($udom, $uname, $namespace,  
  &GDBM_READER());  
     if ($hashref) {  
         my $qresult='';  
  while (my ($key,$value) = each(%$hashref)) {  
     if ($regexp eq '.') {  
  $qresult.=$key.'='.$value.'&';  
     } else {      } else {
  my $unescapeKey = &unescape($key);   $regexp='.';
  if (eval('$unescapeKey=~/$regexp/')) {      }
     $qresult.="$key=$value&";      my $qresult='';
       my $proname=propath($udom,$uname);
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
    while (my ($key,$value) = each(%hash)) {
       if ($regexp eq '.') {
    $qresult.=$key.'='.$value.'&';
       } else {
    my $unescapeKey = &unescape($key);
    if (eval('$unescapeKey=~/$regexp/')) {
       $qresult.="$key=$value&";
    }
       }
  }   }
    if (untie(%hash)) {
       chop($qresult);
       print $client "$qresult\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting dump\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting dump\n";
     }      }
    } else {
       Reply($client, "refused\n", $userinput);
       
  }   }
  if (untie(%$hashref)) {  # ----------------------------------------------------------------------- store
     chop($qresult);      } elsif ($userinput =~ /^store/) {
     Reply($client, "$qresult\n", $userinput);   if(isClient) {
       my ($cmd,$udom,$uname,$namespace,$rid,$what)
    =split(/:/,$userinput);
       $namespace=~s/\//\_/g;
       $namespace=~s/\W//g;
       if ($namespace ne 'roles') {
    chomp($what);
    my $proname=propath($udom,$uname);
    my $now=time;
    my @pairs=split(/\&/,$what);
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
       unless ($namespace=~/^nohist\_/) {
    my $hfh;
    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
       print $hfh "P:$now:$rid:$what\n";
    }
       }
       my @previouskeys=split(/&/,$hash{"keys:$rid"});
       my $key;
       $hash{"version:$rid"}++;
       my $version=$hash{"version:$rid"};
       my $allkeys=''; 
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $allkeys.=$key.':';
    $hash{"$version:$rid:$key"}=$value;
       }
       $hash{"$version:$rid:timestamp"}=$now;
       $allkeys.='timestamp';
       $hash{"$version:keys:$rid"}=$allkeys;
       if (untie(%hash)) {
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting store\n";
    }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting store\n";
    }
       } else {
    print $client "refused\n";
       }
  } else {   } else {
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
      "while attempting dump\n", $userinput);      
  }   }
     } else {  # --------------------------------------------------------------------- restore
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^restore/) {
  "while attempting dump\n", $userinput);   if(isClient) {
     }      my ($cmd,$udom,$uname,$namespace,$rid)
    =split(/:/,$userinput);
     return 1;      $namespace=~s/\//\_/g;
 }      $namespace=~s/\W//g;
 RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);      chomp($rid);
       my $proname=propath($udom,$uname);
 #  Store an aitem in any resource meta data(?) or database with      my $qresult='';
 #  versioning?      my %hash;
 #      if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 #  Parameters:   my $version=$hash{"version:$rid"};
 #    $cmd                - Request command keyword.   $qresult.="version=$version&";
 #    $tail               - Tail of the request.  This is a colon   my $scope;
 #                          separated list containing:   for ($scope=1;$scope<=$version;$scope++) {
 #                          domain/user - User and authentication domain.      my $vkeys=$hash{"$scope:keys:$rid"};
 #                          namespace   - Name of the database being modified      my @keys=split(/:/,$vkeys);
 #                          rid         - Resource keyword to modify.      my $key;
 #                          what        - new value associated with rid.      $qresult.="$scope:keys=$vkeys&";
 #      foreach $key (@keys) {
 #    $client             - Socket open on the client.   $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
 #      }                                  
 #   }
 #  Returns:   if (untie(%hash)) {
 #      1 (keep on processing).      $qresult=~s/\&$//;
 #  Side-Effects:      print $client "$qresult\n";
 #    Writes to the client   } else {
 sub StoreHandler {      print $client "error: ".($!+0)
     my $cmd    = shift;   ." untie(GDBM) Failed ".
     my $tail   = shift;   "while attempting restore\n";
     my $client = shift;   }
    
     my $userinput = "$cmd:$tail";  
   
     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);  
     if ($namespace ne 'roles') {  
   
  chomp($what);  
  my @pairs=split(/\&/,$what);  
  my $hashref  = TieUserHash($udom, $uname, $namespace,  
        &GDBM_WRCREAT(), "P",  
        "$rid:$what");  
  if ($hashref) {  
     my $now = time;  
     my @previouskeys=split(/&/,$hashref->{"keys:$rid"});  
     my $key;  
     $hashref->{"version:$rid"}++;  
     my $version=$hashref->{"version:$rid"};  
     my $allkeys='';   
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  $allkeys.=$key.':';  
  $hashref->{"$version:$rid:$key"}=$value;  
     }  
     $hashref->{"$version:$rid:timestamp"}=$now;  
     $allkeys.='timestamp';  
     $hashref->{"$version:keys:$rid"}=$allkeys;  
     if (untie($hashref)) {  
  Reply($client, "ok\n", $userinput);  
     } else {      } else {
  Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".   print $client "error: ".($!+0)
  "while attempting store\n", $userinput);      ." tie(GDBM) Failed ".
       "while attempting restore\n";
     }      }
    } else  {
       Reply($client, "refused\n", $userinput);
       
    }
   # -------------------------------------------------------------------- chatsend
       } elsif ($userinput =~ /^chatsend/) {
    if(isClient) {
       my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
       &chatadd($cdom,$cnum,$newpost);
       print $client "ok\n";
  } else {   } else {
     Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
      "while attempting store\n", $userinput);      
  }   }
     } else {  # -------------------------------------------------------------------- chatretr
  Failure($client, "refused\n", $userinput);      } elsif ($userinput =~ /^chatretr/) {
     }   if(isClient) {
       my 
     return 1;   ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
 }      my $reply='';
 RegisterHandler("store", \&StoreHandler, 0, 1, 0);      foreach (&getchat($cdom,$cnum,$udom,$uname)) {
 #   $reply.=&escape($_).':';
 #   Restore a prior version of a resource.      }
 #      $reply=~s/\:$//;
 #  Parameters:      print $client $reply."\n";
 #     $cmd               - Command keyword.  
 #     $tail              - Remainder of the request which consists of:  
 #                          domain/user   - User and auth. domain.  
 #                          namespace     - name of resource database.  
 #                          rid           - Resource id.  
 #    $client             - socket open on the client.  
 #  
 # Returns:  
 #      1  indicating the caller should not yet exit.  
 # Side-effects:  
 #   Writes a reply to the client.  
 #  
 sub RestoreHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail"; # Only used for logging purposes.  
   
     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);  
     $namespace=~s/\//\_/g;  
     $namespace=~s/\W//g;  
     chomp($rid);  
     my $proname=propath($udom,$uname);  
     my $qresult='';  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",  
     &GDBM_READER(),0640)) {  
  my $version=$hash{"version:$rid"};  
  $qresult.="version=$version&";  
  my $scope;  
  for ($scope=1;$scope<=$version;$scope++) {  
     my $vkeys=$hash{"$scope:keys:$rid"};  
     my @keys=split(/:/,$vkeys);  
     my $key;  
     $qresult.="$scope:keys=$vkeys&";  
     foreach $key (@keys) {  
  $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";  
     }                                    
  }  
  if (untie(%hash)) {  
     $qresult=~s/\&$//;  
     Reply( $client, "$qresult\n", $userinput);  
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting restore\n", $userinput);      
  }   }
     } else {  # ------------------------------------------------------------------- querysend
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^querysend/) {
  "while attempting restore\n", $userinput);   if (isClient) {
     }      my ($cmd,$query,
      $arg1,$arg2,$arg3)=split(/\:/,$userinput);
     return 1;      $query=~s/\n*$//g;
       print $client "".
    sqlreply("$clientname\&$query".
 }   "\&$arg1"."\&$arg2"."\&$arg3")."\n";
 RegisterHandler("restore", \&RestoreHandler, 0,1,0);   } else {
       Reply($client, "refused\n", $userinput);
 #      
 #   Add a chat message to to a discussion board.  
 #  
 # Parameters:  
 #    $cmd                - Request keyword.  
 #    $tail               - Tail of the command. A colon separated list  
 #                          containing:  
 #                          cdom    - Domain on which the chat board lives  
 #                          cnum    - Identifier of the discussion group.  
 #                          post    - Body of the posting.  
 #   $client              - Socket open on the client.  
 # Returns:  
 #   1    - Indicating caller should keep on processing.  
 #  
 # Side-effects:  
 #   writes a reply to the client.  
 #  
 #  
 sub SendChatHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
       
     my $userinput = "$cmd:$tail";  
   
     my ($cdom,$cnum,$newpost)=split(/\:/,$tail);  
     &chatadd($cdom,$cnum,$newpost);  
     Reply($client, "ok\n", $userinput);  
   
     return 1;  
 }  
 RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);  
 #  
 #   Retrieve the set of chat messagss from a discussion board.  
 #  
 #  Parameters:  
 #    $cmd             - Command keyword that initiated the request.  
 #    $tail            - Remainder of the request after the command  
 #                       keyword.  In this case a colon separated list of  
 #                       chat domain    - Which discussion board.  
 #                       chat id        - Discussion thread(?)  
 #                       domain/user    - Authentication domain and username  
 #                                        of the requesting person.  
 #   $client           - Socket open on the client program.  
 # Returns:  
 #    1     - continue processing  
 # Side effects:  
 #    Response is written to the client.  
 #  
 sub RetrieveChatHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);  
     my $reply='';  
     foreach (&getchat($cdom,$cnum,$udom,$uname)) {  
  $reply.=&escape($_).':';  
     }  
     $reply=~s/\:$//;  
     Reply($client, $reply."\n", $userinput);  
   
   
     return 1;  
 }  
 RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);  
 #  
 #  Initiate a query of an sql database.  SQL query repsonses get put in  
 #  a file for later retrieval.  This prevents sql query results from  
 #  bottlenecking the system.  Note that with loncnew, perhaps this is  
 #  less of an issue since multiple outstanding requests can be concurrently  
 #  serviced.  
 #  
 #  Parameters:  
 #     $cmd       - COmmand keyword that initiated the request.  
 #     $tail      - Remainder of the command after the keyword.  
 #                  For this function, this consists of a query and  
 #                  3 arguments that are self-documentingly labelled  
 #                  in the original arg1, arg2, arg3.  
 #     $client    - Socket open on the client.  
 # Return:  
 #    1   - Indicating processing should continue.  
 # Side-effects:  
 #    a reply is written to $client.  
 #  
 sub SendQueryHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);  
     $query=~s/\n*$//g;  
     Reply($client, "". sqlreply("$clientname\&$query".  
  "\&$arg1"."\&$arg2"."\&$arg3")."\n",  
   $userinput);  
       
     return 1;  
 }  
 RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);  
   
 #  
 #   Add a reply to an sql query.  SQL queries are done asyncrhonously.  
 #   The query is submitted via a "querysend" transaction.  
 #   There it is passed on to the lonsql daemon, queued and issued to  
 #   mysql.  
 #     This transaction is invoked when the sql transaction is complete  
 #   it stores the query results in flie and indicates query completion.  
 #   presumably local software then fetches this response... I'm guessing  
 #   the sequence is: lonc does a querysend, we ask lonsql to do it.  
 #   lonsql on completion of the query interacts with the lond of our  
 #   client to do a query reply storing two files:  
 #    - id     - The results of the query.  
 #    - id.end - Indicating the transaction completed.   
 #    NOTE: id is a unique id assigned to the query and querysend time.  
 # Parameters:  
 #    $cmd        - Command keyword that initiated this request.  
 #    $tail       - Remainder of the tail.  In this case that's a colon  
 #                  separated list containing the query Id and the   
 #                  results of the query.  
 #    $client     - Socket open on the client.  
 # Return:  
 #    1           - Indicating that we should continue processing.  
 # Side effects:  
 #    ok written to the client.  
 #  
 sub ReplyQueryHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($cmd,$id,$reply)=split(/:/,$userinput);   
     my $store;  
     my $execdir=$perlvar{'lonDaemons'};  
     if ($store=IO::File->new(">$execdir/tmp/$id")) {  
  $reply=~s/\&/\n/g;  
  print $store $reply;  
  close $store;  
  my $store2=IO::File->new(">$execdir/tmp/$id.end");  
  print $store2 "done\n";  
  close $store2;  
  Reply($client, "ok\n", $userinput);  
     } else {  
  Failure($client, "error: ".($!+0)  
  ." IO::File->new Failed ".  
  "while attempting queryreply\n", $userinput);  
     }  
    
   
     return 1;  
 }  
 RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);  
 #  
 #  Process the courseidput query.  Not quite sure what this means  
 #  at the system level sense.  It appears a gdbm file in the   
 #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and  
 #  a set of entries made in that database.  
 #  
 # Parameters:  
 #   $cmd      - The command keyword that initiated this request.  
 #   $tail     - Tail of the command.  In this case consists of a colon  
 #               separated list contaning the domain to apply this to and  
 #               an ampersand separated list of keyword=value pairs.  
 #   $client   - Socket open on the client.  
 # Returns:  
 #   1    - indicating that processing should continue  
 #  
 # Side effects:  
 #   reply is written to the client.  
 #  
 sub PutCourseIdHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($udom, $what) = split(/:/, $tail);  
     chomp($what);  
     my $now=time;  
     my @pairs=split(/\&/,$what);  
   
     my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT());  
     if ($hashref) {  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     $hashref->{$key}=$value.':'.$now;  
  }  
  if (untie(%$hashref)) {  
     Reply($client, "ok\n", $userinput);  
  } else {  
     Failure( $client, "error: ".($!+0)  
      ." untie(GDBM) Failed ".  
      "while attempting courseidput\n", $userinput);  
  }   }
     } else {  # ------------------------------------------------------------------ queryreply
  Failure( $client, "error: ".($!+0)      } elsif ($userinput =~ /^queryreply/) {
  ." tie(GDBM) Failed ".   if(isClient) {
  "while attempting courseidput\n", $userinput);      my ($cmd,$id,$reply)=split(/:/,$userinput); 
     }      my $store;
       my $execdir=$perlvar{'lonDaemons'};
     return 1;      if ($store=IO::File->new(">$execdir/tmp/$id")) {
 }   $reply=~s/\&/\n/g;
 RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);   print $store $reply;
    close $store;
 #  Retrieves the value of a course id resource keyword pattern   my $store2=IO::File->new(">$execdir/tmp/$id.end");
 #  defined since a starting date.  Both the starting date and the   print $store2 "done\n";
 #  keyword pattern are optional.  If the starting date is not supplied it   close $store2;
 #  is treated as the beginning of time.  If the pattern is not found,   print $client "ok\n";
 #  it is treatred as "." matching everything.      }
 #      else {
 #  Parameters:   print $client "error: ".($!+0)
 #     $cmd     - Command keyword that resulted in us being dispatched.      ." IO::File->new Failed ".
 #     $tail    - The remainder of the command that, in this case, consists      "while attempting queryreply\n";
 #                of a colon separated list of:      }
 #                 domain   - The domain in which the course database is    } else {
 #                            defined.      Reply($client, "refused\n", $userinput);
 #                 since    - Optional parameter describing the minimum      
 #                            time of definition(?) of the resources that   }
 #                            will match the dump.  # ----------------------------------------------------------------- courseidput
 #                 description - regular expression that is used to filter      } elsif ($userinput =~ /^courseidput/) {
 #                            the dump.  Only keywords matching this regexp   if(isClient) {
 #                            will be used.      my ($cmd,$udom,$what)=split(/:/,$userinput);
 #     $client  - The socket open on the client.      chomp($what);
 # Returns:   $udom=~s/\W//g;
 #    1     - Continue processing.      my $proname=
 # Side Effects:   "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
 #   a reply is written to $client.      my $now=time;
 sub DumpCourseIdHandler {      my @pairs=split(/\&/,$what);
     my $cmd    = shift;      my %hash;
     my $tail   = shift;      if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
     my $client = shift;   foreach my $pair (@pairs) {
       my ($key,$descr,$inst_code)=split(/=/,$pair);
     my $userinput = "$cmd:$tail";      $hash{$key}=$descr.':'.$inst_code.':'.$now;
   
     my ($udom,$since,$description) =split(/:/,$tail);  
     if (defined($description)) {  
  $description=&unescape($description);  
     } else {  
  $description='.';  
     }  
     unless (defined($since)) { $since=0; }  
     my $qresult='';  
     logthis(" Looking for $description  since $since");  
     my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT());  
     if ($hashref) {  
  while (my ($key,$value) = each(%$hashref)) {  
     my ($descr,$lasttime)=split(/\:/,$value);  
     logthis("Got:  key = $key descr = $descr time: $lasttime");  
     if ($lasttime<$since) {   
  logthis("Skipping .. too early");  
  next;   
     }  
     if ($description eq '.') {  
  logthis("Adding wildcard match");  
  $qresult.=$key.'='.$descr.'&';  
     } else {  
  my $unescapeVal = &unescape($descr);  
  logthis("Matching with $unescapeVal");  
  if (eval('$unescapeVal=~/$description/i')) {  
     logthis("Adding on match");  
     $qresult.="$key=$descr&";  
  }   }
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting courseidput\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting courseidput\n";
     }      }
    } else {
       Reply($client, "refused\n", $userinput);
       
  }   }
  if (untie(%$hashref)) {  # ---------------------------------------------------------------- courseiddump
     chop($qresult);      } elsif ($userinput =~ /^courseiddump/) {
     Reply($client, "$qresult\n", $userinput);   if(isClient) {
       my ($cmd,$udom,$since,$description)
    =split(/:/,$userinput);
       if (defined($description)) {
    $description=&unescape($description);
       } else {
    $description='.';
       }
       unless (defined($since)) { $since=0; }
       my $qresult='';
       my $proname=
    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
    while (my ($key,$value) = each(%hash)) {
       my ($descr,$lasttime,$inst_code);
       if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
    ($descr,$inst_code,$lasttime)=($1,$2,$3);
       } else {
    ($descr,$lasttime) = split(/\:/,$value);
       }
       if ($lasttime<$since) { next; }
       if ($description eq '.') {
    $qresult.=$key.'='.$descr.':'.$inst_code.'&';
       } else {
    my $unescapeVal = &unescape($descr);
    if (eval('$unescapeVal=~/\Q$description\E/i')) {
       $qresult.=$key.'='.$descr.':'.$inst_code.'&';
    }
       }
    }
    if (untie(%hash)) {
       chop($qresult);
       print $client "$qresult\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting courseiddump\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting courseiddump\n";
       }
  } else {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting courseiddump\n", $userinput);      
  }   }
     } else {  # ----------------------------------------------------------------------- idput
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^idput/) {
  "while attempting courseiddump\n", $userinput);   if(isClient) {
     }      my ($cmd,$udom,$what)=split(/:/,$userinput);
       chomp($what);
       $udom=~s/\W//g;
     return 1;      my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
 }      my $now=time;
 RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);      my @pairs=split(/\&/,$what);
 #      my %hash;
 #  Puts an id to a domains id database.       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
 #   {
 #  Parameters:      my $hfh;
 #   $cmd     - The command that triggered us.      if ($hfh=IO::File->new(">>$proname.hist")) {
 #   $tail    - Remainder of the request other than the command. This is a    print $hfh "P:$now:$what\n";
 #              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   foreach my $pair (@pairs) {
 #                        of keyword=value.      my ($key,$value)=split(/=/,$pair);
 #   $client  - Socket open on the client.      $hash{$key}=$value;
 #  Returns:   }
 #    1   - Continue processing.   if (untie(%hash)) {
 #  Side effects:      print $client "ok\n";
 #     reply is written to $client.   } else {
 #      print $client "error: ".($!+0)
 sub PutIdHandler {   ." untie(GDBM) Failed ".
     my $cmd    = shift;   "while attempting idput\n";
     my $tail   = shift;   }
     my $client = shift;      } else {
    print $client "error: ".($!+0)
     my $userinput = "$cmd:$tail";      ." tie(GDBM) Failed ".
       "while attempting idput\n";
     my ($udom,$what)=split(/:/,$tail);      }
     chomp($what);   } else {
     my @pairs=split(/\&/,$what);      Reply($client, "refused\n", $userinput);
     my $hashref = TieDomainHash($udom, "ids", &GDBM_WRCREAT(),      
  "P", $what);  
     if ($hashref) {  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     $hashref->{$key}=$value;  
  }   }
  if (untie(%$hashref)) {  # ----------------------------------------------------------------------- idget
     Reply($client, "ok\n", $userinput);      } elsif ($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 {   } else {
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
     "while attempting idput\n", $userinput);      
  }   }
     } else {  # ---------------------------------------------------------------------- tmpput
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".      } elsif ($userinput =~ /^tmpput/) {
  "while attempting idput\n", $userinput);   if(isClient) {
     }      my ($cmd,$what)=split(/:/,$userinput);
       my $store;
     return 1;      $tmpsnum++;
 }      my $id=$$.'_'.$clientip.'_'.$tmpsnum;
       $id=~s/\W/\_/g;
 RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);      $what=~s/\n//g;
 #      my $execdir=$perlvar{'lonDaemons'};
 #  Retrieves a set of id values from the id database.      if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
 #  Returns an & separated list of results, one for each requested id to the   print $store $what;
 #  client.   close $store;
 #   print $client "$id\n";
 # Parameters:      }
 #   $cmd       - Command keyword that caused us to be dispatched.      else {
 #   $tail      - Tail of the command.  Consists of a colon separated:   print $client "error: ".($!+0)
 #               domain - the domain whose id table we dump      ."IO::File->new Failed ".
 #               ids      Consists of an & separated list of      "while attempting tmpput\n";
 #                        id keywords whose values will be fetched.      }
 #                        nonexisting keywords will have an empty value.  
 #   $client    - Socket open on the client.  
 #  
 # Returns:  
 #    1 - indicating processing should continue.  
 # Side effects:  
 #   An & separated list of results is written to $client.  
 #  
 sub GetIdHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
       
     my $userinput = "$client:$tail";  
       
     my ($udom,$what)=split(/:/,$tail);  
     chomp($what);  
     my @queries=split(/\&/,$what);  
     my $qresult='';  
     my $hashref = TieDomainHash($udom, "ids", &GDBM_READER());  
     if ($hashref) {  
  for (my $i=0;$i<=$#queries;$i++) {  
     $qresult.="$hashref->{$queries[$i]}&";  
  }  
  if (untie(%$hashref)) {  
     $qresult=~s/\&$//;  
     Reply($client, "$qresult\n", $userinput);  
  } else {   } else {
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".      Reply($client, "refused\n", $userinput);
      "while attempting idget\n",$userinput);      
  }   }
     } else {  
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  # ---------------------------------------------------------------------- tmpget
  "while attempting idget\n",$userinput);      } elsif ($userinput =~ /^tmpget/) {
     }   if(isClient) {
           my ($cmd,$id)=split(/:/,$userinput);
     return 1;      chomp($id);
 }      $id=~s/\W/\_/g;
       my $store;
 RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);      my $execdir=$perlvar{'lonDaemons'};
 #      if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
 #  Process the tmpput command I'm not sure what this does.. Seems to   my $reply=<$store>;
 #  create a file in the lonDaemons/tmp directory of the form $id.tmp      print $client "$reply\n";
 # where Id is the client's ip concatenated with a sequence number.   close $store;
 # The file will contain some value that is passed in.  Is this e.g.      }
 # a login token?      else {
 #   print $client "error: ".($!+0)
 # Parameters:      ."IO::File->new Failed ".
 #    $cmd     - The command that got us dispatched.      "while attempting tmpget\n";
 #    $tail    - The remainder of the request following $cmd:  
 #               In this case this will be the contents of the file.  
 #    $client  - Socket connected to the client.  
 # Returns:  
 #    1 indicating processing can continue.  
 # Side effects:  
 #   A file is created in the local filesystem.  
 #   A reply is sent to the client.  
 sub TmpPutHandler {  
     my $cmd       = shift;  
     my $what      = shift;  
     my $client    = shift;  
   
     my $userinput = "$cmd:$what"; # Reconstruct for logging.  
   
   
     my $store;  
     $tmpsnum++;  
     my $id=$$.'_'.$clientip.'_'.$tmpsnum;  
     $id=~s/\W/\_/g;  
     $what=~s/\n//g;  
     my $execdir=$perlvar{'lonDaemons'};  
     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {  
  print $store $what;  
  close $store;  
  Reply($client, "$id\n", $userinput);  
     } else {  
  Failure( $client, "error: ".($!+0)."IO::File->new Failed ".  
  "while attempting tmpput\n", $userinput);  
     }  
     return 1;  
     
 }  
 RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0);  
   
 #   Processes the tmpget command.  This command returns the contents  
 #  of a temporary resource file(?) created via tmpput.  
 #  
 # Paramters:  
 #    $cmd      - Command that got us dispatched.  
 #    $id       - Tail of the command, contain the id of the resource  
 #                we want to fetch.  
 #    $client   - socket open on the client.  
 # Return:  
 #    1         - Inidcating processing can continue.  
 # Side effects:  
 #   A reply is sent to the client.  
   
 #  
 sub TmpGetHandler {  
     my $cmd       = shift;  
     my $id        = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$id";   
       
     chomp($id);  
     $id=~s/\W/\_/g;  
     my $store;  
     my $execdir=$perlvar{'lonDaemons'};  
     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {  
  my $reply=<$store>;  
  Reply( $client, "$reply\n", $userinput);  
  close $store;  
     } else {  
  Failure( $client, "error: ".($!+0)."IO::File->new Failed ".  
  "while attempting tmpget\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0);  
 #  
 #  Process the tmpdel command.  This command deletes a temp resource  
 #  created by the tmpput command.  
 #  
 # Parameters:  
 #   $cmd      - Command that got us here.  
 #   $id       - Id of the temporary resource created.  
 #   $client   - socket open on the client process.  
 #  
 # Returns:  
 #   1     - Indicating processing should continue.  
 # Side Effects:  
 #   A file is deleted  
 #   A reply is sent to the client.  
 sub TmpDelHandler {  
     my $cmd      = shift;  
     my $id       = shift;  
     my $client   = shift;  
       
     my $userinput= "$cmd:$id";  
       
     chomp($id);  
     $id=~s/\W/\_/g;  
     my $execdir=$perlvar{'lonDaemons'};  
     if (unlink("$execdir/tmp/$id.tmp")) {  
  Reply($client, "ok\n", $userinput);  
     } else {  
  Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".  
  "while attempting tmpdel\n", $userinput);  
     }  
       
     return 1;  
   
 }  
 RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0);  
 #  
 #   ls  - list the contents of a directory.  For each file in the  
 #    selected directory the filename followed by the full output of  
 #    the stat function is returned.  The returned info for each  
 #    file are separated by ':'.  The stat fields are separated by &'s.  
 # Parameters:  
 #    $cmd        - The command that dispatched us (ls).  
 #    $ulsdir     - The directory path to list... I'm not sure what this  
 #                  is relative as things like ls:. return e.g.  
 #                  no_such_dir.  
 #    $client     - Socket open on the client.  
 # Returns:  
 #     1 - indicating that the daemon should not disconnect.  
 # Side Effects:  
 #   The reply is written to  $client.  
 #  
 sub LsHandler {  
     my $cmd     = shift;  
     my $ulsdir  = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$ulsdir";  
   
     my $ulsout='';  
     my $ulsfn;  
     if (-e $ulsdir) {  
  if(-d $ulsdir) {  
     if (opendir(LSDIR,$ulsdir)) {  
  while ($ulsfn=readdir(LSDIR)) {  
     my @ulsstats=stat($ulsdir.'/'.$ulsfn);  
     $ulsout.=$ulsfn.'&'.  
  join('&',@ulsstats).':';  
  }  
  closedir(LSDIR);  
     }      }
  } else {   } else {
     my @ulsstats=stat($ulsdir);      Reply($client, "refused\n", $userinput);
     $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';      
  }   }
     } else {  # ---------------------------------------------------------------------- tmpdel
  $ulsout='no_such_dir';      } elsif ($userinput =~ /^tmpdel/) {
     }   if(isClient) {
     if ($ulsout eq '') { $ulsout='empty'; }      my ($cmd,$id)=split(/:/,$userinput);
     Reply($client, "$ulsout\n", $userinput);      chomp($id);
       $id=~s/\W/\_/g;
       my $execdir=$perlvar{'lonDaemons'};
     return 1;      if (unlink("$execdir/tmp/$id.tmp")) {
 }   print $client "ok\n";
 RegisterHandler("ls", \&LsHandler, 0, 1, 0);      } else {
    print $client "error: ".($!+0)
       ."Unlink tmp Failed ".
 #      "while attempting tmpdel\n";
 #   Processes the setannounce command.  This command      }
 #   creates a file named announce.txt in the top directory of   } else {
 #   the documentn root and sets its contents.  The announce.txt file is      Reply($client, "refused\n", $userinput);
 #   printed in its entirety at the LonCAPA login page.  Note:      
 #   once the announcement.txt fileis created it cannot be deleted.  
 #   However, setting the contents of the file to empty removes the  
 #   announcement from the login page of loncapa so who cares.  
 #  
 # Parameters:  
 #    $cmd          - The command that got us dispatched.  
 #    $announcement - The text of the announcement.  
 #    $client       - Socket open on the client process.  
 # Retunrns:  
 #   1             - Indicating request processing should continue  
 # Side Effects:  
 #   The file {DocRoot}/announcement.txt is created.  
 #   A reply is sent to $client.  
 #  
 sub SetAnnounceHandler {  
     my $cmd          = shift;  
     my $announcement = shift;  
     my $client       = shift;  
     
     my $userinput    = "$cmd:$announcement";  
   
     chomp($announcement);  
     $announcement=&unescape($announcement);  
     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.  
  '/announcement.txt')) {  
  print $store $announcement;  
  close $store;  
  Reply($client, "ok\n", $userinput);  
     } else {  
  Failure($client, "error: ".($!+0)."\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0);  
   
 #  
 #  Return the version of the daemon.  This can be used to determine  
 #  the compatibility of cross version installations or, alternatively to  
 #  simply know who's out of date and who isn't.  Note that the version  
 #  is returned concatenated with the tail.  
 # Parameters:  
 #   $cmd        - the request that dispatched to us.  
 #   $tail       - Tail of the request (client's version?).  
 #   $client     - Socket open on the client.  
 #Returns:  
 #   1 - continue processing requests.  
 # Side Effects:  
 #   Replies with version to $client.  
 sub GetVersionHandler {  
     my $client     = shift;  
     my $tail       = shift;  
     my $client     = shift;  
     my $userinput  = $client;  
       
     Reply($client, &version($userinput)."\n", $userinput);  
   
   
     return 1;  
 }  
 RegisterHandler("version", \&GetVersionHandler, 0, 1, 0);  
   
 #  Set the current host and domain.  This is used to support  
 #  multihomed systems.  Each IP of the system, or even separate daemons  
 #  on the same IP can be treated as handling a separate lonCAPA virtual  
 #  machine.  This command selects the virtual lonCAPA.  The client always  
 #  knows the right one since it is lonc and it is selecting the domain/system  
 #  from the hosts.tab file.  
 # Parameters:  
 #    $cmd      - Command that dispatched us.  
 #    $tail     - Tail of the command (domain/host requested).  
 #    $socket   - Socket open on the client.  
 #  
 # Returns:  
 #     1   - Indicates the program should continue to process requests.  
 # Side-effects:  
 #     The default domain/system context is modified for this daemon.  
 #     a reply is sent to the client.  
 #  
 sub SelectHostHandler {  
     my $cmd        = shift;  
     my $tail       = shift;  
     my $socket     = shift;  
     
     my $userinput  ="$cmd:$tail";  
   
     Reply($client, &sethost($userinput)."\n", $userinput);  
   
   
     return 1;  
 }  
 RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0);  
   
 #  Process a request to exit:  
 #   - "bye" is sent to the client.  
 #   - The client socket is shutdown and closed.  
 #   - We indicate to the caller that we should exit.  
 # Formal Parameters:  
 #   $cmd                - The command that got us here.  
 #   $tail               - Tail of the command (empty).  
 #   $client             - Socket open on the tail.  
 # Returns:  
 #   0      - Indicating the program should exit!!  
 #  
 sub ExitHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     &logthis("Client $clientip ($clientname) hanging up: $userinput");  
     Reply($client, "bye\n", $userinput);  
     $client->shutdown(2);        # shutdown the socket forcibly.  
     $client->close();  
   
     return 0;  
 }  
 RegisterHandler("exit", \&ExitHandler, 0, 1,1);  
 RegisterHandler("init", \&ExitHandler, 0, 1,1); # RE-init is like exit.  
 RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too!  
 #------------------------------------------------------------------------------------  
 #  
 #   Process a Request.  Takes a request from the client validates  
 #   it and performs the operation requested by it.  Returns  
 #   a response to the client.  
 #  
 #  Parameters:  
 #      request      - A string containing the user's request.  
 #  Returns:  
 #      0            - Requested to exit, caller should shut down.  
 #      1            - Accept additional requests from the client.  
 #  
 sub ProcessRequest {  
     my $Request      = shift;  
     my $KeepGoing    = 1; # Assume we're not asked to stop.  
       
     my $wasenc=0;  
     my $userinput = $Request;   # for compatibility with oldcode <yeach>  
   
   
 # ------------------------------------------------------------ See if encrypted  
      
     if($userinput =~ /^enc/) {  
  $wasenc = 1;  
  $userinput = Decipher($userinput);  
  if(! $userinput) {  
     Failure($client,"error:Encrypted data without negotiating key");  
     return 0;                      # Break off with this imposter.  
  }   }
     }  # ----------------------------------------- portfolio directory list (portls)
     # Split off the request keyword from the rest of the stuff.      } elsif ($userinput =~ /^portls/) {
       if(isClient) {
     my ($command, $tail) = split(/:/, $userinput, 2);      my ($cmd,$uname,$udom)=split(/:/,$userinput);
       my $udir=propath($udom,$uname).'/userfiles/portfolio';
     Debug("Command received: $command, encoded = $wasenc");      my $dirLine='';
       my $dirContents='';
          if (opendir(LSDIR,$udir.'/')){
 # ------------------------------------------------------------- Normal commands   while ($dirLine = readdir(LSDIR)){
       $dirContents = $dirContents.$dirLine.'<br />';
     #    }
     #   If the command is in the hash, then execute it via the hash dispatch:      } else {
     #   $dirContents = "No directory found\n";
     if(defined $Dispatcher{$command}) {      }
       print $client $dirContents."\n";
  my $DispatchInfo = $Dispatcher{$command};   } else {
  my $Handler      = $$DispatchInfo[0];      Reply($client, "refused\n", $userinput);
  my $NeedEncode   = $$DispatchInfo[1];  
  my $ClientTypes  = $$DispatchInfo[2];  
  Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");  
         
  #  Validate the request:  
         
  my $ok = 1;  
  my $requesterprivs = 0;  
  if(isClient()) {  
     $requesterprivs |= $CLIENT_OK;  
  }   }
  if(isManager()) {  # -------------------------------------------------------------------------- ls
     $requesterprivs |= $MANAGER_OK;      } elsif ($userinput =~ /^ls/) {
    if(isClient) {
       my $obs;
       my $rights;
       my ($cmd,$ulsdir)=split(/:/,$userinput);
       my $ulsout='';
       my $ulsfn;
       if (-e $ulsdir) {
    if(-d $ulsdir) {
       if (opendir(LSDIR,$ulsdir)) {
    while ($ulsfn=readdir(LSDIR)) {
       undef $obs, $rights; 
       my @ulsstats=stat($ulsdir.'/'.$ulsfn);
       #We do some obsolete checking here
       if(-e $ulsdir.'/'.$ulsfn.".meta") { 
    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
    my @obsolete=<FILE>;
    foreach my $obsolete (@obsolete) {
       if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; } 
       if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
    }
       }
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
       if($obs eq '1') { $ulsout.="&1"; }
       else { $ulsout.="&0"; }
       if($rights eq '1') { $ulsout.="&1:"; }
       else { $ulsout.="&0:"; }
    }
    closedir(LSDIR);
       }
    } else {
       my @ulsstats=stat($ulsdir);
       $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
    }
       } else {
    $ulsout='no_such_dir';
       }
       if ($ulsout eq '') { $ulsout='empty'; }
       print $client "$ulsout\n";
    } else {
       Reply($client, "refused\n", $userinput);
       
  }   }
  if($NeedEncode && (!$wasenc)) {  # ----------------------------------------------------------------- setannounce
     Debug("Must encode but wasn't: $NeedEncode $wasenc");      } elsif ($userinput =~ /^setannounce/) {
     $ok = 0;   if (isClient) {
       my ($cmd,$announcement)=split(/:/,$userinput);
       chomp($announcement);
       $announcement=&unescape($announcement);
       if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
    '/announcement.txt')) {
    print $store $announcement;
    close $store;
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)."\n";
       }
    } else {
       Reply($client, "refused\n", $userinput);
       
  }   }
  if(($ClientTypes & $requesterprivs) == 0) {  # ------------------------------------------------------------------ Hanging up
     Debug("Client not privileged to do this operation");      } elsif (($userinput =~ /^exit/) ||
     $ok = 0;       ($userinput =~ /^init/)) { # no restrictions.
    &logthis(
    "Client $clientip ($clientname) hanging up: $userinput");
    print $client "bye\n";
    $client->shutdown(2);        # shutdown the socket forcibly.
    $client->close();
    return 0;
   
   # ---------------------------------- set current host/domain
       } elsif ($userinput =~ /^sethost:/) {
    if (isClient) {
       print $client &sethost($userinput)."\n";
    } else {
       print $client "refused\n";
  }   }
   #---------------------------------- request file (?) version.
  if($ok) {      } elsif ($userinput =~/^version:/) {
     Debug("Dispatching to handler $command $tail");   if (isClient) {
     $KeepGoing = &$Handler($command, $tail, $client);      print $client &version($userinput)."\n";
  } else {   } else {
     Debug("Refusing to dispatch because ok is false");      print $client "refused\n";
     Failure($client, "refused", $userinput);  
  }   }
   #------------------------------- is auto-enrollment enabled?
       } elsif ($userinput =~/^autorun:/) {
 # ------------------------------------------------------------- unknown command   if (isClient) {
       my ($cmd,$cdom) = split(/:/,$userinput);
     } else {      my $outcome = &localenroll::run($cdom);
  # unknown command      print $client "$outcome\n";
  Failure($client, "unknown_cmd\n", $userinput);   } else {
     }      print $client "0\n";
   
     return $KeepGoing;  
 }  
   
   
 #  
 #   GetCertificate: Given a transaction that requires a certificate,  
 #   this function will extract the certificate from the transaction  
 #   request.  Note that at this point, the only concept of a certificate  
 #   is the hostname to which we are connected.  
 #  
 #   Parameter:  
 #      request   - The request sent by our client (this parameterization may  
 #                  need to change when we really use a certificate granting  
 #                  authority.  
 #  
 sub GetCertificate {  
     my $request = shift;  
   
     return $clientip;  
 }  
   
   
   
 #  
 #   ReadManagerTable: Reads in the current manager table. For now this is  
 #                     done on each manager authentication because:  
 #                     - These authentications are not frequent  
 #                     - This allows dynamic changes to the manager table  
 #                       without the need to signal to the lond.  
 #  
   
 sub ReadManagerTable {  
   
     #   Clean out the old table first..  
   
     foreach my $key (keys %managers) {  
  delete $managers{$key};  
     }  
   
     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";  
     if (!open (MANAGERS, $tablename)) {  
  logthis('<font color="red">No manager table.  Nobody can manage!!</font>');  
  return;  
     }  
     while(my $host = <MANAGERS>) {  
  chomp($host);  
  if ($host =~ "^#") {                  # Comment line.  
     logthis('<font color="green"> Skipping line: '. "$host</font>\n");  
     next;  
  }   }
  if (!defined $hostip{$host}) { # This is a non cluster member  #------------------------------- get official sections (for auto-enrollment).
     #  The entry is of the form:      } elsif ($userinput =~/^autogetsections:/) {
     #    cluname:hostname   if (isClient) {
     #  cluname - A 'cluster hostname' is needed in order to negotiate      my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
     #            the host key.      my @secs = &localenroll::get_sections($coursecode,$cdom);
     #  hostname- The dns name of the host.      my $seclist = &escape(join(':',@secs));
     #      print $client "$seclist\n";
     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 {   } else {
     logthis('<font color="green"> existing host'." $host</font>\n");      print $client "refused\n";
     $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber  
  }   }
     }  #----------------------- validate owner of new course section (for auto-enrollment).
 }      } elsif ($userinput =~/^autonewcourse:/) {
    if (isClient) {
 #      my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
 #  ValidManager: Determines if a given certificate represents a valid manager.      my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
 #                in this primitive implementation, the 'certificate' is      print $client "$outcome\n";
 #                just the connecting loncapa client name.  This is checked   } else {
 #                against a valid client list in the configuration.      print $client "refused\n";
 #  
 #                    
 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 = <$oldfh>;  # Suck in the entire file.  #-------------- validate course section in schedule of classes (for auto-enrollment).
       } elsif ($userinput =~/^autovalidatecourse:/) {
  # write the backup file:   if (isClient) {
       my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
  my $newfh = IO::File->new("> $newfile");      my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
  if(!(defined $newfh)){      print $client "$outcome\n";
     return 0;   } else {
       print $client "refused\n";
  }   }
  my $lines = scalar @contents;  #--------------------------- create password for new user (for auto-enrollment).
  for (my $i =0; $i < $lines; $i++) {      } elsif ($userinput =~/^autocreatepassword:/) {
     print $newfh ($contents[$i]);   if (isClient) {
       my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
       my ($create_passwd,$authchk);
       ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
       print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
    } else {
       print $client "refused\n";
  }   }
   #---------------------------  read and remove temporary files (for auto-enrollment).
  $oldfh->close;      } elsif ($userinput =~/^autoretrieve:/) {
  $newfh->close;   if (isClient) {
       my ($cmd,$filename) = split(/:/,$userinput);
  chmod(0660, $newfile);      my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
       if ( (-e $source) && ($filename ne '') ) {
  return 1;   my $reply = '';
        if (open(my $fh,$source)) {
     } else {      while (<$fh>) {
  return 0;   chomp($_);
     }   $_ =~ s/^\s+//g;
 }   $_ =~ s/\s+$//g;
 #   $reply .= $_;
 #  Host files are passed out with externally visible host IPs.      }
 #  If, for example, we are behind a fire-wall or NAT host, our       close($fh);
 #  internally visible IP may be different than the externally      print $client &escape($reply)."\n";
 #  visible IP.  Therefore, we always adjust the contents of the  #                                unlink($source);
 #  host file so that the entry for ME is the IP that we believe   } else {
 #  we have.  At present, this is defined as the entry that      print $client "error\n";
 #  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 {
    print $client "error\n";
     } else { # Not me, pass unmodified.  
  $adjusted .= $line."\n";  
     }      }
  } else {                  # Blank or comment never re-written.   } else {
     $adjusted .= $line."\n"; # Pass blanks and comments as is.      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";
     }      }
     return $adjusted;  # -------------------------------------------------------------------- complete
 }      Debug("process_request - returning 1");
 #  
 #   InstallFile: Called to install an administrative file:  
 #       - The file is created with <name>.tmp  
 #       - The <name>.tmp file is then mv'd to <name>  
 #   This lugubrious procedure is done to ensure that we are never without  
 #   a valid, even if dated, version of the file regardless of who crashes  
 #   and when the crash occurs.  
 #  
 #  Parameters:  
 #       Name of the file  
 #       File Contents.  
 #  Return:  
 #      nonzero - success.  
 #      0       - failure and $! has an errno.  
 #  
 sub InstallFile {  
     my $Filename = shift;  
     my $Contents = shift;  
     my $TempFile = $Filename.".tmp";  
   
     #  Open the file for write:  
       
     my $fh = IO::File->new("> $TempFile"); # Write to temp.  
     if(!(defined $fh)) {  
  &logthis('<font color="red"> Unable to create '.$TempFile."</font>");  
  return 0;  
     }  
     #  write the contents of the file:  
       
     print $fh ($Contents);   
     $fh->close; # In case we ever have a filesystem w. locking  
   
     chmod(0660, $TempFile);  
   
     # Now we can move install the file in position.  
       
     move($TempFile, $Filename);  
   
     return 1;      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 3355  sub catchexception { Line 3049  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.' - '.$lastlog);
     if ($client) { print $client "error: $error\n"; }      if ($client) { print $client "error: $error\n"; }
     $server->close();      $server->close();
Line 3366  sub catchexception { Line 3060  sub catchexception {
   
 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
Line 3383  undef $perlvarref; Line 3077  undef $perlvarref;
 # ----------------------------- Make sure this process is running from user=www  # ----------------------------- Make sure this process is running from user=www
 my $wwwid=getpwnam('www');  my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {  if ($wwwid!=$<) {
     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
     my $subj="LON: $currenthostid User ID mismatch";     my $subj="LON: $currenthostid User ID mismatch";
     system("echo 'User ID mismatch.  lond must be run as user www.' |\     system("echo 'User ID mismatch.  lond must be run as user www.' |\
  mailto $emailto -s '$subj' > /dev/null");   mailto $emailto -s '$subj' > /dev/null");
     exit 1;     exit 1;
 }  }
   
 # --------------------------------------------- Check if other instance running  # --------------------------------------------- Check if other instance running
Line 3395  if ($wwwid!=$<) { Line 3089  if ($wwwid!=$<) {
 my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";  my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
   
 if (-e $pidfile) {  if (-e $pidfile) {
     my $lfh=IO::File->new("$pidfile");     my $lfh=IO::File->new("$pidfile");
     my $pide=<$lfh>;     my $pide=<$lfh>;
     chomp($pide);     chomp($pide);
     if (kill 0 => $pide) { die "already running"; }     if (kill 0 => $pide) { die "already running"; }
 }  }
   
 # ------------------------------------------------------------- Read hosts file  # ------------------------------------------------------------- Read hosts file
Line 3411  $server = IO::Socket::INET->new(LocalPor Line 3105  $server = IO::Socket::INET->new(LocalPor
                                 Proto     => 'tcp',                                  Proto     => 'tcp',
                                 Reuse     => 1,                                  Reuse     => 1,
                                 Listen    => 10 )                                  Listen    => 10 )
     or die "making socket: $@\n";    or die "making socket: $@\n";
   
 # --------------------------------------------------------- Do global variables  # --------------------------------------------------------- Do global variables
   
 # 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{$pid});
    }
     }      }
     &status("Finished Handling child death");      &status("Finished Handling child death");
 }  }
Line 3441  sub HUNTSMAN {                      # si Line 3143  sub HUNTSMAN {                      # si
     &logthis("Free socket: ".shutdown($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 3451  sub HUPSMAN {                      # sig Line 3153  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 3461  sub HUPSMAN {                      # sig Line 3163  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 3473  sub KillHostHashes { Line 3175  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 3483  sub KillHostHashes { Line 3188  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 3552  sub checkchildren { Line 3265  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';      $SIG{__DIE__} = 'DEFAULT';
     &status("Checking on the children (waiting for reports)");      &status("Checking on the children (waiting for reports)");
     foreach (sort keys %children) {      foreach (sort keys %children) {
         unless (-e "$docdir/lon-status/londchld/$_.txt") {          unless (-e "$docdir/lon-status/londchld/$_.txt") {
     eval {            eval {
  alarm(300);              alarm(300);
  &logthis('Child '.$_.' did not respond');      &logthis('Child '.$_.' did not respond');
  kill 9 => $_;      kill 9 => $_;
  #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";      #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
  #$subj="LON: $currenthostid killed lond process $_";      #$subj="LON: $currenthostid killed lond process $_";
  #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 $execdir/logs/lond.log.$_`;
  alarm(0);      delete($children{$_});
     }      alarm(0);
     }
         }          }
     }      }
     $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 3610  sub Debug { Line 3327  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 3655  sub logstatus { Line 3367  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";
    flock(DB,LOCK_UN);
    close(LOG);
     }      }
     ResetStatistics;  
     &status("Finished logging");      &status("Finished logging");
      
 }  }
   
 sub initnewstatus {  sub initnewstatus {
Line 3689  sub status { Line 3402  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 3725  sub reconlonc { Line 3435  sub reconlonc {
     &logthis("lonc at pid $loncpid responding, sending USR1");      &logthis("lonc at pid $loncpid responding, sending USR1");
             kill USR1 => $loncpid;              kill USR1 => $loncpid;
         } else {          } else {
     &logthis("<font color=red>CRITICAL: "      &logthis(
      ."lonc at pid $loncpid not responding, giving up</font>");                "<font color='red'>CRITICAL: "
                ."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 3741  sub subreply { Line 3452  sub subreply {
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
  or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "$cmd\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
Line 3750  sub subreply { Line 3461  sub subreply {
 }  }
   
 sub reply {  sub reply {
     my ($cmd,$server)=@_;    my ($cmd,$server)=@_;
     my $answer;    my $answer;
     if ($server ne $currenthostid) {     if ($server ne $currenthostid) { 
  $answer=subreply($cmd,$server);      $answer=subreply($cmd,$server);
  if ($answer eq 'con_lost') {      if ($answer eq 'con_lost') {
     $answer=subreply("ping",$server);   $answer=subreply("ping",$server);
     if ($answer ne $server) {          if ($answer ne $server) {
  &logthis("sub reply: answer != server answer is $answer, server is $server");      &logthis("sub reply: answer != server answer is $answer, server is $server");
  &reconlonc("$perlvar{'lonSockDir'}/$server");             &reconlonc("$perlvar{'lonSockDir'}/$server");
     }          }
     $answer=subreply($cmd,$server);          $answer=subreply($cmd,$server);
  }      }
     } else {    } else {
  $answer='self_reply';      $answer='self_reply';
     }     } 
     return $answer;    return $answer;
 }  }
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
Line 3784  sub subsqlreply { Line 3495  sub subsqlreply {
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
  or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "$cmd\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
Line 3796  sub subsqlreply { Line 3507  sub subsqlreply {
   
 sub propath {  sub propath {
     my ($udom,$uname)=@_;      my ($udom,$uname)=@_;
     Debug("Propath:$udom:$uname");  
     $udom=~s/\W//g;      $udom=~s/\W//g;
     $uname=~s/\W//g;      $uname=~s/\W//g;
     Debug("Propath2:$udom:$uname");  
     my $subdir=$uname.'__';      my $subdir=$uname.'__';
     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;      $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";      my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
     Debug("Propath returning $proname");  
     return $proname;      return $proname;
 }   } 
   
Line 3836  my $execdir=$perlvar{'lonDaemons'}; Line 3544  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 3854  $SIG{USR2} = \&UpdateHosts; Line 3562  $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 3870  while (1) { Line 3577  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 3880  sub make_new_child { Line 3588  sub make_new_child {
     $sigset = POSIX::SigSet->new(SIGINT);      $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset)      sigprocmask(SIG_BLOCK, $sigset)
         or die "Can't block SIGINT for fork: $!\n";          or die "Can't block SIGINT for fork: $!\n";
       
     die "fork: $!" unless defined ($pid = fork);      die "fork: $!" unless defined ($pid = fork);
   
     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of      $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
Line 3891  sub make_new_child { Line 3599  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 3916  sub make_new_child { Line 3636  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();
   
  &status('Accepted connection');   &status('Accepted connection');
 # =============================================================================  # =============================================================================
             # 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 3943  sub make_new_child { Line 3663  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, '.
      $clientip.       $clientip.
      " ($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)");    #
  $remotereq=<$client>;   my ($i, $inittype) = split(/:/, $remotereq);
  $remotereq=~s/\W//g;  
  if ($challenge eq $remotereq) {   # If the connection type is ssl, but I didn't get my
     $clientok=1;   # certificate files yet, then I'll drop  back to 
     print $client "ok\n";   # insecure (if allowed).
   
    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("<font color=blue>WARNING: $clientip did not reply challenge</font>");      my $ok = InsecureConnection($client);
     &status('No challenge reply '.$clientip);      if($ok) {
    $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("<font color=blue>WARNING: "   &logthis(
    "<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("<font color=blue>WARNING: Unknown client $clientip</font>");      &logthis(
        "<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 3985  sub make_new_child { Line 3771  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 4032  sub make_new_child { Line 3818  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 ManagePermissions
     my $request = shift;  {
     my $domain  = shift;  
     my $user    = shift;      my ($request, $domain, $user, $authtype) = @_;
     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 4048  sub ManagePermissions { Line 3832  sub ManagePermissions {
     }      }
 }  }
   
   
 #  #
 #  Return the full path of a user password file, whether it exists or not.  #  Return the full path of a user password file, whether it exists or not.
 # Parameters:  # Parameters:
Line 4056  sub ManagePermissions { Line 3841  sub ManagePermissions {
 # Returns:  # Returns:
 #    Full passwd path:  #    Full passwd path:
 #  #
 sub PasswordPath {  sub password_path {
     my $domain = shift;      my ($domain, $user) = @_;
     my $user   = shift;  
   
     my $path   = &propath($domain, $user);      my $path   = &propath($domain, $user);
     $path  .= "/passwd";      $path  .= "/passwd";
Line 4076  sub PasswordPath { Line 3861  sub PasswordPath {
 #   - If the password file exists returns its path.  #   - If the password file exists returns its path.
 #   - If the password file does not exist, returns undefined.  #   - If the password file does not exist, returns undefined.
 #  #
 sub PasswordFilename {  sub password_filename {
     my $domain    = shift;      my ($domain, $user) = @_;
     my $user      = shift;  
   
     Debug ("PasswordFilename called: dom = $domain user = $user");      Debug ("PasswordFilename called: dom = $domain user = $user");
   
     my $path  = PasswordPath($domain, $user);      my $path  = &password_path($domain, $user);
     Debug("PasswordFilename got path: $path");      Debug("PasswordFilename got path: $path");
     if(-e $path) {      if(-e $path) {
  return $path;   return $path;
Line 4101  sub PasswordFilename { Line 3885  sub PasswordFilename {
 #   0    - Failed.  #   0    - Failed.
 #   1    - Success.  #   1    - Success.
 #  #
 sub RewritePwFile {  sub rewrite_password_file {
     my $domain   = shift;      my ($domain, $user, $contents) = @_;
     my $user     = shift;  
     my $contents = shift;  
   
     my $file = PasswordFilename($domain, $user);      my $file = &password_filename($domain, $user);
     if (defined $file) {      if (defined $file) {
  my $pf = IO::File->new(">$file");   my $pf = IO::File->new(">$file");
  if($pf) {   if($pf) {
Line 4120  sub RewritePwFile { Line 3902  sub RewritePwFile {
     }      }
   
 }  }
   
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  #   get_auth_type - Determines the authorization type of a user in a domain.
   
 #     Returns the authorization type or nouser if there is no such user.  #     Returns the authorization type or nouser if there is no such user.
 #  #
 sub GetAuthType {  sub get_auth_type 
     my $domain = shift;  {
     my $user   = shift;  
       my ($domain, $user)  = @_;
     Debug("GetAuthType( $domain, $user ) \n");  
     my $passwdfile = PasswordFilename($domain, $user);      Debug("get_auth_type( $domain, $user ) \n");
     if( defined $passwdfile ) {      my $proname    = &propath($domain, $user); 
       my $passwdfile = "$proname/passwd";
       if( -e $passwdfile ) {
  my $pf = IO::File->new($passwdfile);   my $pf = IO::File->new($passwdfile);
  my $realpassword = <$pf>;   my $realpassword = <$pf>;
  chomp($realpassword);   chomp($realpassword);
  Debug("Password info = $realpassword\n");   Debug("Password info = $realpassword\n");
  return $realpassword;   my ($authtype, $contentpwd) = split(/:/, $realpassword);
     } else {   Debug("Authtype = $authtype, content = $contentpwd\n");
    my $availinfo = '';
    if($authtype eq 'krb4' or $authtype eq 'krb5') {
       $availinfo = $contentpwd;
    }
   
    return "$authtype:$availinfo";
       }
       else {
  Debug("Returning nouser");   Debug("Returning nouser");
  return "nouser";   return "nouser";
     }      }
Line 4158  sub GetAuthType { Line 3951  sub GetAuthType {
 #                user.  #                user.
 #     0        - The domain,user,password triplet is not a valid user.  #     0        - The domain,user,password triplet is not a valid user.
 #  #
 sub ValidateUser {  sub validate_user {
     my $domain  = shift;      my ($domain, $user, $password) = @_;
     my $user    = shift;  
     my $password= shift;  
   
     # Why negative ~pi you may well ask?  Well this function is about      # Why negative ~pi you may well ask?  Well this function is about
     # authentication, and therefore very important to get right.      # authentication, and therefore very important to get right.
Line 4178  sub ValidateUser { Line 3970  sub ValidateUser {
     #  the user has been assigned.  If the authentication type is      #  the user has been assigned.  If the authentication type is
     #  "nouser", the user does not exist so we will return 0.      #  "nouser", the user does not exist so we will return 0.
   
     my $contents = GetAuthType($domain, $user);      my $contents = &get_auth_type($domain, $user);
     my ($howpwd, $contentpwd) = split(/:/, $contents);      my ($howpwd, $contentpwd) = split(/:/, $contents);
   
     my $null = pack("C",0); # Used by kerberos auth types.      my $null = pack("C",0); # Used by kerberos auth types.
Line 4269  sub ValidateUser { Line 4061  sub ValidateUser {
     return $validated;      return $validated;
 }  }
   
 #  
 #    Add a line to the subscription list?  
 #  
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
Line 4291  sub addline { Line 4081  sub addline {
     $sh->close();      $sh->close();
     return $found;      return $found;
 }  }
 #  
 #    Get chat messages.  
 #  
 sub getchat {  sub getchat {
     my ($cdom,$cname,$udom,$uname)=@_;      my ($cdom,$cname,$udom,$uname)=@_;
     my %hash;      my %hash;
Line 4318  sub getchat { Line 4106  sub getchat {
     }      }
     return (@participants,@entries);      return (@participants,@entries);
 }  }
 #  
 #   Add a chat message  
 #  
 sub chatadd {  sub chatadd {
     my ($cdom,$cname,$newchat)=@_;      my ($cdom,$cname,$newchat)=@_;
     my %hash;      my %hash;
Line 4360  sub chatadd { Line 4146  sub chatadd {
 sub unsub {  sub unsub {
     my ($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 4379  sub currentversion { Line 4184  sub currentversion {
     my $version=-1;      my $version=-1;
     my $ulsdir='';      my $ulsdir='';
     if ($fname=~/^(.+)\/[^\/]+$/) {      if ($fname=~/^(.+)\/[^\/]+$/) {
  $ulsdir=$1;         $ulsdir=$1;
     }      }
     my ($fnamere1,$fnamere2);      my ($fnamere1,$fnamere2);
     # remove version if already specified      # remove version if already specified
Line 4436  sub subscribe { Line 4241  sub subscribe {
                     symlink($root.'.'.$extension,                      symlink($root.'.'.$extension,
                             $root.'.'.$currentversion.'.'.$extension);                              $root.'.'.$currentversion.'.'.$extension);
                     unless ($extension=~/\.meta$/) {                      unless ($extension=~/\.meta$/) {
  symlink($root.'.'.$extension.'.meta',                         symlink($root.'.'.$extension.'.meta',
  $root.'.'.$currentversion.'.'.$extension.'.meta');                              $root.'.'.$currentversion.'.'.$extension.'.meta');
     }      }
                 }                  }
             }              }
Line 4491  sub make_passwd_file { Line 4296  sub make_passwd_file {
     print $pf "localauth:$npass\n";      print $pf "localauth:$npass\n";
  }   }
     } elsif ($umode eq 'unix') {      } elsif ($umode eq 'unix') {
  #   {
  #  Don't allow the creation of privileged accounts!!! that would      #
  #  be real bad!!!      #  Don't allow the creation of privileged accounts!!! that would
  #      #  be real bad!!!
  my $uid = getpwnam($uname);      #
  if((defined $uid) && ($uid == 0)) {      my $uid = getpwnam($uname);
     &logthis(">>>Attempted add of privileged account blocked<<<");      if((defined $uid) && ($uid == 0)) {
     return "no_priv_account_error\n";   &logthis(">>>Attempted to create privilged account blocked");
  }   return "no_priv_account_error\n";
       }
   
  #      my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
  my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";      my $lc_error_file  = "/tmp/lcuseradd".$$.".status";
       {
  &Debug("Executing external: ".$execpath);   &Debug("Executing external: ".$execpath);
  &Debug("user  = ".$uname.", Password =". $npass);   &Debug("user  = ".$uname.", Password =". $npass);
  my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");   my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
  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 = $?;      }
  if($useraddok > 0) {      my $error = IO::File->new("< $lc_error_file");
     my $lcstring = lcuseraddstrerror($useraddok);      my $useraddok = <$error>;
     &logthis("Failed lcuseradd: $lcstring");      $error->close;
     return "error: lcuseradd failed: $lcstring\n";      unlink($lc_error_file);
   
       chomp $useraddok;
   
       if($useraddok > 0) {
    my $error_text = &lcuseraddstrerror($useraddok);
    &logthis("Failed lcuseradd: $error_text");
    $result = "lcuseradd_failed:$error_text\n";
       }
       else {
    my $pf = IO::File->new(">$passfilename");
    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 $pf "none:\n";
  }   }
     } else {      } else {
Line 4536  sub sethost { Line 4351  sub sethost {
     my (undef,$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 4552  sub version { Line 4367  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 4578  sub userload { Line 4391  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

Removed from v.1.178.2.18  
changed lines
  Added in v.1.223


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