--- loncom/lond 2001/05/11 19:31:25 1.47
+++ loncom/lond 2004/08/24 07:26:04 1.237
@@ -1,73 +1,3655 @@
#!/usr/bin/perl
# The LearningOnline Network
# lond "LON Daemon" Server (port "LOND" 5663)
-# 5/26/99,6/4,6/10,6/11,6/14,6/15,6/26,6/28,6/30,
-# 7/8,7/9,7/10,7/12,7/17,7/19,9/21,
-# 10/7,10/8,10/9,10/11,10/13,10/15,11/4,11/16,
-# 12/7,12/15,01/06,01/11,01/12,01/14,2/8,
-# 03/07,05/31 Gerd Kortemeyer
-# 06/26 Scott Harrison
-# 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer
-# 12/05 Scott Harrison
-# 12/05,12/13,12/29 Gerd Kortemeyer
-# Jan 01 Scott Harrison
-# 02/12 Gerd Kortemeyer
-# 03/15 Scott Harrison
-# 03/24 Gerd Kortemeyer
-# 04/02 Scott Harrison
-# 05/11 Gerd Kortemeyer
-#
-# based on "Perl Cookbook" ISBN 1-56592-243-3
-# preforker - server who forks first
-# runs as a daemon
-# HUPs
-# uses IDEA encryption
+#
+# $Id: lond,v 1.237 2004/08/24 07:26:04 albertel Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+
+
+# http://www.lon-capa.org/
+#
+
+use strict;
+use lib '/home/httpd/lib/perl/';
+use LONCAPA::Configuration;
use IO::Socket;
use IO::File;
-use Apache::File;
+#use Apache::File;
use Symbol;
use POSIX;
use Crypt::IDEA;
use LWP::UserAgent();
use GDBM_File;
use Authen::Krb4;
+use Authen::Krb5;
+use lib '/home/httpd/lib/perl/';
+use localauth;
+use localenroll;
+use File::Copy;
+use LONCAPA::ConfigFileEdit;
+use LONCAPA::lonlocal;
+use LONCAPA::lonssl;
+use Fcntl qw(:flock);
+
+my $DEBUG = 0; # Non zero to enable debug log entries.
+
+my $status='';
+my $lastlog='';
+
+my $VERSION='$Revision: 1.237 $'; #' stupid emacs
+my $remoteVERSION;
+my $currenthostid="default";
+my $currentdomainid;
+
+my $client;
+my $clientip; # IP address of client.
+my $clientdns; # DNS name of client.
+my $clientname; # LonCAPA name of client.
+
+my $server;
+my $thisserver; # DNS of us.
+
+my $keymode;
+
+my $cipher; # Cipher key negotiated with client
+my $tmpsnum = 0; # Id of tmpputs.
+
+#
+# Connection type is:
+# client - All client actions are allowed
+# manager - only management functions allowed.
+# both - Both management and client actions are allowed
+#
+
+my $ConnectionType;
+
+my %hostid; # ID's for hosts in cluster by ip.
+my %hostdom; # LonCAPA domain for hosts in cluster.
+my %hostip; # IPs for hosts in cluster.
+my %hostdns; # ID's of hosts looked up by DNS name.
+
+my %managers; # Ip -> manager names
+
+my %perlvar; # Will have the apache conf defined perl vars.
+
+#
+# The hash below is used for command dispatching, and is therefore keyed on the request keyword.
+# Each element of the hash contains a reference to an array that contains:
+# A reference to a sub that executes the request corresponding to the keyword.
+# A flag that is true if the request must be encoded to be acceptable.
+# A mask with bits as follows:
+# CLIENT_OK - Set when the function is allowed by ordinary clients
+# MANAGER_OK - Set when the function is allowed to manager clients.
+#
+my $CLIENT_OK = 1;
+my $MANAGER_OK = 2;
+my %Dispatcher;
+
+
+#
+# The array below are password error strings."
+#
+my $lastpwderror = 13; # Largest error number from lcpasswd.
+my @passwderrors = ("ok",
+ "lcpasswd must be run as user 'www'",
+ "lcpasswd got incorrect number of arguments",
+ "lcpasswd did not get the right nubmer of input text lines",
+ "lcpasswd too many simultaneous pwd changes in progress",
+ "lcpasswd User does not exist.",
+ "lcpasswd Incorrect current passwd",
+ "lcpasswd Unable to su to root.",
+ "lcpasswd Cannot set new passwd.",
+ "lcpasswd Username has invalid characters",
+ "lcpasswd Invalid characters in password",
+ "lcpasswd User already exists",
+ "lcpasswd Something went wrong with user addition.",
+ "lcpasswd Password mismatch",
+ "lcpasswd Error filename is invalid");
+
+
+# The array below are lcuseradd error strings.:
+
+my $lastadderror = 13;
+my @adderrors = ("ok",
+ "User ID mismatch, lcuseradd must run as user www",
+ "lcuseradd Incorrect number of command line parameters must be 3",
+ "lcuseradd Incorrect number of stdinput lines, must be 3",
+ "lcuseradd Too many other simultaneous pwd changes in progress",
+ "lcuseradd User does not exist",
+ "lcuseradd Unable to make www member of users's group",
+ "lcuseradd Unable to su to root",
+ "lcuseradd Unable to set password",
+ "lcuseradd Usrname has invalid characters",
+ "lcuseradd Password has an invalid character",
+ "lcuseradd User already exists",
+ "lcuseradd Could not add user.",
+ "lcuseradd Password mismatch");
+
+
+
+#
+# Statistics that are maintained and dislayed in the status line.
+#
+my $Transactions = 0; # Number of attempted transactions.
+my $Failures = 0; # Number of transcations failed.
+
+# ResetStatistics:
+# Resets the statistics counters:
+#
+sub ResetStatistics {
+ $Transactions = 0;
+ $Failures = 0;
+}
+
+#------------------------------------------------------------------------
+#
+# LocalConnection
+# Completes the formation of a locally authenticated connection.
+# This function will ensure that the 'remote' client is really the
+# local host. If not, the connection is closed, and the function fails.
+# If so, initcmd is parsed for the name of a file containing the
+# IDEA session key. The fie is opened, read, deleted and the session
+# key returned to the caller.
+#
+# Parameters:
+# $Socket - Socket open on client.
+# $initcmd - The full text of the init command.
+#
+# Implicit inputs:
+# $clientdns - The DNS name of the remote client.
+# $thisserver - Our DNS name.
+#
+# Returns:
+# IDEA session key on success.
+# undef on failure.
+#
+sub LocalConnection {
+ my ($Socket, $initcmd) = @_;
+ Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
+ if($clientdns ne $thisserver) {
+ &logthis('<font color="red"> LocalConnection rejecting non local: '
+ ."$clientdns ne $thisserver </font>");
+ close $Socket;
+ return undef;
+ } else {
+ chomp($initcmd); # Get rid of \n in filename.
+ my ($init, $type, $name) = split(/:/, $initcmd);
+ Debug(" Init command: $init $type $name ");
+
+ # Require that $init = init, and $type = local: Otherwise
+ # the caller is insane:
+
+ if(($init ne "init") && ($type ne "local")) {
+ &logthis('<font color = "red"> LocalConnection: caller is insane! '
+ ."init = $init, and type = $type </font>");
+ close($Socket);;
+ return undef;
+
+ }
+ # Now get the key filename:
+
+ my $IDEAKey = lonlocal::ReadKeyFile($name);
+ return $IDEAKey;
+ }
+}
+#------------------------------------------------------------------------------
+#
+# SSLConnection
+# Completes the formation of an ssh authenticated connection. The
+# socket is promoted to an ssl socket. If this promotion and the associated
+# certificate exchange are successful, the IDEA key is generated and sent
+# to the remote peer via the SSL tunnel. The IDEA key is also returned to
+# the caller after the SSL tunnel is torn down.
+#
+# Parameters:
+# Name Type Purpose
+# $Socket IO::Socket::INET Plaintext socket.
+#
+# Returns:
+# IDEA key on success.
+# undef on failure.
+#
+sub SSLConnection {
+ my $Socket = shift;
+
+ Debug("SSLConnection: ");
+ my $KeyFile = lonssl::KeyFile();
+ if(!$KeyFile) {
+ my $err = lonssl::LastError();
+ &logthis("<font color=\"red\"> CRITICAL"
+ ."Can't get key file $err </font>");
+ return undef;
+ }
+ my ($CACertificate,
+ $Certificate) = lonssl::CertificateFile();
+
+
+ # If any of the key, certificate or certificate authority
+ # certificate filenames are not defined, this can't work.
+
+ if((!$Certificate) || (!$CACertificate)) {
+ my $err = lonssl::LastError();
+ &logthis("<font color=\"red\"> CRITICAL"
+ ."Can't get certificates: $err </font>");
+
+ return undef;
+ }
+ Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
+
+ # Indicate to our peer that we can procede with
+ # a transition to ssl authentication:
+
+ print $Socket "ok:ssl\n";
+
+ Debug("Approving promotion -> ssl");
+ # And do so:
+
+ my $SSLSocket = lonssl::PromoteServerSocket($Socket,
+ $CACertificate,
+ $Certificate,
+ $KeyFile);
+ if(! ($SSLSocket) ) { # SSL socket promotion failed.
+ my $err = lonssl::LastError();
+ &logthis("<font color=\"red\"> CRITICAL "
+ ."SSL Socket promotion failed: $err </font>");
+ return undef;
+ }
+ Debug("SSL Promotion successful");
+
+ #
+ # The only thing we'll use the socket for is to send the IDEA key
+ # to the peer:
+
+ my $Key = lonlocal::CreateCipherKey();
+ print $SSLSocket "$Key\n";
+
+ lonssl::Close($SSLSocket);
+
+ Debug("Key exchange complete: $Key");
+
+ return $Key;
+}
+#
+# InsecureConnection:
+# If insecure connections are allowd,
+# exchange a challenge with the client to 'validate' the
+# client (not really, but that's the protocol):
+# We produce a challenge string that's sent to the client.
+# The client must then echo the challenge verbatim to us.
+#
+# Parameter:
+# Socket - Socket open on the client.
+# Returns:
+# 1 - success.
+# 0 - failure (e.g.mismatch or insecure not allowed).
+#
+sub InsecureConnection {
+ my $Socket = shift;
+
+ # Don't even start if insecure connections are not allowed.
+
+ if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
+ return 0;
+ }
+
+ # Fabricate a challenge string and send it..
+
+ my $challenge = "$$".time; # pid + time.
+ print $Socket "$challenge\n";
+ &status("Waiting for challenge reply");
+
+ my $answer = <$Socket>;
+ $answer =~s/\W//g;
+ if($challenge eq $answer) {
+ return 1;
+ } else {
+ logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
+ &status("No challenge reqply");
+ return 0;
+ }
+
+
+}
+
+#
+# GetCertificate: Given a transaction that requires a certificate,
+# this function will extract the certificate from the transaction
+# 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.
+#
+sub isManager {
+ return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
+}
+#
+# Return tru if client can do client functions
+#
+sub isClient {
+ return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
+}
+
+
+#
+# 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.
+# If requested a history entry is created in the associated hist file.
+#
+# Parameters:
+# domain - Name of the domain in which the resource file lives.
+# namespace - Name of the hash within that domain.
+# how - How to tie the hash (e.g. GDBM_WRCREAT()).
+# loghead - Optional parameter, if present a log entry is created
+# in the associated history file and this is the first part
+# of that entry.
+# logtail - Goes along with loghead, The actual logentry is of the
+# form $loghead:<timestamp>:logtail.
+# Returns:
+# Reference to a hash bound to the db file or alternatively undef
+# if the tie failed.
+#
+sub tie_domain_hash {
+ my ($domain,$namespace,$how,$loghead,$logtail) = @_;
+
+ # Filter out any whitespace in the domain name:
+
+ $domain =~ s/\W//g;
+
+ # We have enough to go on to tie the hash:
+
+ my $user_top_dir = $perlvar{'lonUsersDir'};
+ my $domain_dir = $user_top_dir."/$domain";
+ my $resource_file = $domain_dir."/$namespace.db";
+ my %hash;
+ if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
+ if (defined($loghead)) { # Need to log the operation.
+ my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
+ if($logFh) {
+ my $timestamp = time;
+ print $logFh "$loghead:$timestamp:$logtail\n";
+ }
+ $logFh->close;
+ }
+ return \%hash; # Return the tied hash.
+ } else {
+ return undef; # Tie failed.
+ }
+}
+
+#
+# Ties a user's resource file to a hash.
+# If necessary, an appropriate history
+# log file entry is made as well.
+# This sub factors out common code from the subs that manipulate
+# the various gdbm files that keep keyword value pairs.
+# Parameters:
+# domain - Name of the domain the user is in.
+# user - Name of the 'current user'.
+# namespace - Namespace representing the file to tie.
+# how - What the tie is done to (e.g. GDBM_WRCREAT().
+# loghead - Optional first part of log entry if there may be a
+# history file.
+# what - Optional tail of log entry if there may be a history
+# file.
+# Returns:
+# hash to which the database is tied. It's up to the caller to untie.
+# undef if the has could not be tied.
+#
+sub tie_user_hash {
+ my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
+
+ $namespace=~s/\//\_/g; # / -> _
+ $namespace=~s/\W//g; # whitespace eliminated.
+ my $proname = propath($domain, $user);
+
+ # Tie the database.
+
+ my %hash;
+ if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
+ $how, 0640)) {
+ # If this is a namespace for which a history is kept,
+ # make the history log entry:
+ if (($namespace =~/^nohist\_/) && (defined($loghead))) {
+ my $args = scalar @_;
+ Debug(" Opening history: $namespace $args");
+ my $hfh = IO::File->new(">>$proname/$namespace.hist");
+ if($hfh) {
+ my $now = time;
+ print $hfh "$loghead:$now:$what\n";
+ }
+ $hfh->close;
+ }
+ return \%hash;
+ } else {
+ return undef;
+ }
+
+}
+
+#--------------------- Request Handlers --------------------------------------------
+#
+# By convention each request handler registers itself prior to the sub
+# declaration:
+#
+
+#++
+#
+# Handles ping requests.
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $replyfd- File descriptor connected to the client
+# Implicit Inputs:
+# $currenthostid - Global variable that carries the name of the host we are
+# known as.
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit.
+# Side effects:
+# Reply information is sent to the client.
+
+sub ping_handler {
+ my ($cmd, $tail, $client) = @_;
+ Debug("$cmd $tail $client .. $currenthostid:");
+
+ Reply( $client,"$currenthostid\n","$cmd:$tail");
+
+ return 1;
+}
+®ister_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager.
+
+#++
+#
+# Handles pong requests. Pong replies with our current host id, and
+# the results of a ping sent to us via our lonc.
+#
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $replyfd- File descriptor connected to the client
+# Implicit Inputs:
+# $currenthostid - Global variable that carries the name of the host we are
+# connected to.
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit.
+# Side effects:
+# Reply information is sent to the client.
+
+sub pong_handler {
+ my ($cmd, $tail, $replyfd) = @_;
+
+ my $reply=&reply("ping",$clientname);
+ &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
+ return 1;
+}
+®ister_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager
+
+#++
+# Called to establish an encrypted session key with the remote client.
+# Note that with secure lond, in most cases this function is never
+# invoked. Instead, the secure session key is established either
+# via a local file that's locked down tight and only lives for a short
+# time, or via an ssl tunnel...and is generated from a bunch-o-random
+# bits from /dev/urandom, rather than the predictable pattern used by
+# by this sub. This sub is only used in the old-style insecure
+# key negotiation.
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $replyfd- File descriptor connected to the client
+# Implicit Inputs:
+# $currenthostid - Global variable that carries the name of the host
+# known as.
+# $clientname - Global variable that carries the name of the hsot we're connected to.
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit.
+# Implicit Outputs:
+# Reply information is sent to the client.
+# $cipher is set with a reference to a new IDEA encryption object.
+#
+sub establish_key_handler {
+ my ($cmd, $tail, $replyfd) = @_;
+
+ my $buildkey=time.$$.int(rand 100000);
+ $buildkey=~tr/1-6/A-F/;
+ $buildkey=int(rand 100000).$buildkey.int(rand 100000);
+ my $key=$currenthostid.$clientname;
+ $key=~tr/a-z/A-Z/;
+ $key=~tr/G-P/0-9/;
+ $key=~tr/Q-Z/0-9/;
+ $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
+ $key=substr($key,0,32);
+ my $cipherkey=pack("H32",$key);
+ $cipher=new IDEA $cipherkey;
+ &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
+
+ return 1;
+
+}
+®ister_handler("ekey", \&establish_key_handler, 0, 1,1);
+
+
+# Handler for the load command. Returns the current system load average
+# to the requestor.
+#
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $replyfd- File descriptor connected to the client
+# Implicit Inputs:
+# $currenthostid - Global variable that carries the name of the host
+# known as.
+# $clientname - Global variable that carries the name of the hsot we're connected to.
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit.
+# Side effects:
+# Reply information is sent to the client.
+sub load_handler {
+ my ($cmd, $tail, $replyfd) = @_;
+
+ # Get the load average from /proc/loadavg and calculate it as a percentage of
+ # the allowed load limit as set by the perl global variable lonLoadLim
+
+ my $loadavg;
+ my $loadfile=IO::File->new('/proc/loadavg');
+
+ $loadavg=<$loadfile>;
+ $loadavg =~ s/\s.*//g; # Extract the first field only.
+
+ my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
+
+ &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
+
+ return 1;
+}
+register_handler("load", \&load_handler, 0, 1, 0);
+
+#
+# Process the userload request. This sub returns to the client the current
+# user load average. It can be invoked either by clients or managers.
+#
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $replyfd- File descriptor connected to the client
+# Implicit Inputs:
+# $currenthostid - Global variable that carries the name of the host
+# known as.
+# $clientname - Global variable that carries the name of the hsot we're connected to.
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit
+# Implicit inputs:
+# whatever the userload() function requires.
+# Implicit outputs:
+# the reply is written to the client.
+#
+sub user_load_handler {
+ my ($cmd, $tail, $replyfd) = @_;
+
+ my $userloadpercent=&userload();
+ &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
+
+ return 1;
+}
+register_handler("userload", \&user_load_handler, 0, 1, 0);
+
+# Process a request for the authorization type of a user:
+# (userauth).
+#
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $replyfd- File descriptor connected to the client
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit
+# Implicit outputs:
+# The user authorization type is written to the client.
+#
+sub user_authorization_type {
+ my ($cmd, $tail, $replyfd) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ # Pull the domain and username out of the command tail.
+ # and call get_auth_type to determine the authentication type.
+
+ my ($udom,$uname)=split(/:/,$tail);
+ my $result = &get_auth_type($udom, $uname);
+ if($result eq "nouser") {
+ &Failure( $replyfd, "unknown_user\n", $userinput);
+ } else {
+ #
+ # We only want to pass the second field from get_auth_type
+ # for ^krb.. otherwise we'll be handing out the encrypted
+ # password for internals e.g.
+ #
+ my ($type,$otherinfo) = split(/:/,$result);
+ if($type =~ /^krb/) {
+ $type = $result;
+ }
+ &Reply( $replyfd, "$type:\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("currentauth", \&user_authorization_type, 1, 1, 0);
+
+# Process a request by a manager to push a hosts or domain table
+# to us. We pick apart the command and pass it on to the subs
+# that already exist to do this.
+#
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $client - File descriptor connected to the client
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit
+# Implicit Output:
+# a reply is written to the client.
+
+sub push_file_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ # At this time we only know that the IP of our partner is a valid manager
+ # the code below is a hook to do further authentication (e.g. to resolve
+ # spoofing).
+
+ my $cert = &GetCertificate($userinput);
+ if(&ValidManager($cert)) {
+
+ # Now presumably we have the bona fides of both the peer host and the
+ # process making the request.
+
+ my $reply = &PushFile($userinput);
+ &Reply($client, "$reply\n", $userinput);
+
+ } else {
+ &Failure( $client, "refused\n", $userinput);
+ }
+ return 1;
+}
+®ister_handler("pushfile", \&push_file_handler, 1, 0, 1);
+
+
+
+# Process a reinit request. Reinit requests that either
+# lonc or lond be reinitialized so that an updated
+# host.tab or domain.tab can be processed.
+#
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $client - File descriptor connected to the client
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit
+# Implicit output:
+# a reply is sent to the client.
+#
+sub reinit_process_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my $cert = &GetCertificate($userinput);
+ if(&ValidManager($cert)) {
+ chomp($userinput);
+ my $reply = &ReinitProcess($userinput);
+ &Reply( $client, "$reply\n", $userinput);
+ } else {
+ &Failure( $client, "refused\n", $userinput);
+ }
+ return 1;
+}
+
+®ister_handler("reinit", \&reinit_process_handler, 1, 0, 1);
+
+# Process the editing script for a table edit operation.
+# the editing operation must be encrypted and requested by
+# a manager host.
+#
+# Parameters:
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $client - File descriptor connected to the client
+# Returns:
+# 1 - Ok to continue processing.
+# 0 - Program should exit
+# Implicit output:
+# a reply is sent to the client.
+#
+sub edit_table_handler {
+ my ($command, $tail, $client) = @_;
+
+ my $userinput = "$command:$tail";
+
+ my $cert = &GetCertificate($userinput);
+ if(&ValidManager($cert)) {
+ my($filetype, $script) = split(/:/, $tail);
+ if (($filetype eq "hosts") ||
+ ($filetype eq "domain")) {
+ if($script ne "") {
+ &Reply($client, # BUGBUG - EditFile
+ &EditFile($userinput), # could fail.
+ $userinput);
+ } else {
+ &Failure($client,"refused\n",$userinput);
+ }
+ } else {
+ &Failure($client,"refused\n",$userinput);
+ }
+ } else {
+ &Failure($client,"refused\n",$userinput);
+ }
+ return 1;
+}
+register_handler("edit", \&edit_table_handler, 1, 0, 1);
+
+
+#
+# Authenticate a user against the LonCAPA authentication
+# database. Note that there are several authentication
+# possibilities:
+# - unix - The user can be authenticated against the unix
+# password file.
+# - internal - The user can be authenticated against a purely
+# internal per user password file.
+# - kerberos - The user can be authenticated against either a kerb4 or kerb5
+# ticket granting authority.
+# - user - The person tailoring LonCAPA can supply a user authentication
+# mechanism that is per system.
+#
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+# Implicit inputs:
+# The authentication systems describe above have their own forms of implicit
+# input into the authentication process that are described above.
+#
+sub authenticate_handler {
+ my ($cmd, $tail, $client) = @_;
+
+
+ # Regenerate the full input line
+
+ my $userinput = $cmd.":".$tail;
+
+ # udom - User's domain.
+ # uname - Username.
+ # upass - User's password.
+
+ my ($udom,$uname,$upass)=split(/:/,$tail);
+ &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
+ chomp($upass);
+ $upass=&unescape($upass);
+
+ my $pwdcorrect = &validate_user($udom, $uname, $upass);
+ if($pwdcorrect) {
+ &Reply( $client, "authorized\n", $userinput);
+ #
+ # Bad credentials: Failed to authorize
+ #
+ } else {
+ &Failure( $client, "non_authorized\n", $userinput);
+ }
+
+ return 1;
+}
+
+register_handler("auth", \&authenticate_handler, 1, 1, 0);
+
+#
+# Change a user's password. Note that this function is complicated by
+# the fact that a user may be authenticated in more than one way:
+# At present, we are not able to change the password for all types of
+# authentication methods. Only for:
+# unix - unix password or shadow passoword style authentication.
+# local - Locally written authentication mechanism.
+# For now, kerb4 and kerb5 password changes are not supported and result
+# in an error.
+# FUTURE WORK:
+# Support kerberos passwd changes?
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+# Implicit inputs:
+# The authentication systems describe above have their own forms of implicit
+# input into the authentication process that are described above.
+sub change_password_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = $cmd.":".$tail; # Reconstruct client's string.
+
+ #
+ # udom - user's domain.
+ # uname - Username.
+ # upass - Current password.
+ # npass - New password.
+
+ my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
+
+ $upass=&unescape($upass);
+ $npass=&unescape($npass);
+ &Debug("Trying to change password for $uname");
+
+ # First require that the user can be authenticated with their
+ # old password:
+
+ my $validated = &validate_user($udom, $uname, $upass);
+ if($validated) {
+ my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd.
+
+ my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
+ if ($howpwd eq 'internal') {
+ &Debug("internal auth");
+ my $salt=time;
+ $salt=substr($salt,6,2);
+ my $ncpass=crypt($npass,$salt);
+ if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
+ &logthis("Result of password change for "
+ ."$uname: pwchange_success");
+ &Reply($client, "ok\n", $userinput);
+ } else {
+ &logthis("Unable to open $uname passwd "
+ ."to change password");
+ &Failure( $client, "non_authorized\n",$userinput);
+ }
+ } elsif ($howpwd eq 'unix') {
+ # Unix means we have to access /etc/password
+ &Debug("auth is unix");
+ my $execdir=$perlvar{'lonDaemons'};
+ &Debug("Opening lcpasswd pipeline");
+ my $pf = IO::File->new("|$execdir/lcpasswd > "
+ ."$perlvar{'lonDaemons'}"
+ ."/logs/lcpasswd.log");
+ print $pf "$uname\n$npass\n$npass\n";
+ close $pf;
+ my $err = $?;
+ my $result = ($err>0 ? 'pwchange_failure' : 'ok');
+ &logthis("Result of password change for $uname: ".
+ &lcpasswdstrerror($?));
+ &Reply($client, "$result\n", $userinput);
+ } else {
+ # this just means that the current password mode is not
+ # one we know how to change (e.g the kerberos auth modes or
+ # locally written auth handler).
+ #
+ &Failure( $client, "auth_mode_error\n", $userinput);
+ }
+
+ } else {
+ &Failure( $client, "non_authorized\n", $userinput);
+ }
+
+ return 1;
+}
+register_handler("passwd", \&change_password_handler, 1, 1, 0);
+
+
+#
+# Create a new user. User in this case means a lon-capa user.
+# The user must either already exist in some authentication realm
+# like kerberos or the /etc/passwd. If not, a user completely local to
+# this loncapa system is created.
+#
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+# Implicit inputs:
+# The authentication systems describe above have their own forms of implicit
+# input into the authentication process that are described above.
+sub add_user_handler {
+
+ my ($cmd, $tail, $client) = @_;
+
+
+ my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
+ my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
+
+ &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
+
+
+ if($udom eq $currentdomainid) { # Reject new users for other domains...
+
+ my $oldumask=umask(0077);
+ chomp($npass);
+ $npass=&unescape($npass);
+ my $passfilename = &password_path($udom, $uname);
+ &Debug("Password file created will be:".$passfilename);
+ if (-e $passfilename) {
+ &Failure( $client, "already_exists\n", $userinput);
+ } else {
+ my @fpparts=split(/\//,$passfilename);
+ my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
+ my $fperror='';
+ for (my $i=3;$i<= ($#fpparts-1);$i++) {
+ $fpnow.='/'.$fpparts[$i];
+ unless (-e $fpnow) {
+ &logthis("mkdir $fpnow");
+ unless (mkdir($fpnow,0777)) {
+ $fperror="error: ".($!+0)." mkdir failed while attempting "
+ ."makeuser";
+ }
+ }
+ }
+ unless ($fperror) {
+ my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
+ &Reply($client, $result, $userinput); #BUGBUG - could be fail
+ } else {
+ &Failure($client, "$fperror\n", $userinput);
+ }
+ }
+ umask($oldumask);
+ } else {
+ &Failure($client, "not_right_domain\n",
+ $userinput); # Even if we are multihomed.
+
+ }
+ return 1;
+
+}
+®ister_handler("makeuser", \&add_user_handler, 1, 1, 0);
+
+#
+# Change the authentication method of a user. Note that this may
+# also implicitly change the user's password if, for example, the user is
+# joining an existing authentication realm. Known authentication realms at
+# this time are:
+# internal - Purely internal password file (only loncapa knows this user)
+# local - Institutionally written authentication module.
+# unix - Unix user (/etc/passwd with or without /etc/shadow).
+# kerb4 - kerberos version 4
+# kerb5 - kerberos version 5
+#
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+# Implicit inputs:
+# The authentication systems describe above have their own forms of implicit
+# input into the authentication process that are described above.
+#
+sub change_authentication_handler {
+
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail"; # Reconstruct user input.
+
+ my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
+ &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
+ if ($udom ne $currentdomainid) {
+ &Failure( $client, "not_right_domain\n", $client);
+ } else {
+
+ chomp($npass);
+
+ $npass=&unescape($npass);
+ my $passfilename = &password_path($udom, $uname);
+ if ($passfilename) { # Not allowed to create a new user!!
+ my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
+ &Reply($client, $result, $userinput);
+ } else {
+ &Failure($client, "non_authorized", $userinput); # Fail the user now.
+ }
+ }
+ return 1;
+}
+®ister_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
+
+#
+# Determines if this is the home server for a user. The home server
+# for a user will have his/her lon-capa passwd file. Therefore all we need
+# to do is determine if this file exists.
+#
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+# Implicit inputs:
+# The authentication systems describe above have their own forms of implicit
+# input into the authentication process that are described above.
+#
+sub is_home_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$uname)=split(/:/,$tail);
+ chomp($uname);
+ my $passfile = &password_filename($udom, $uname);
+ if($passfile) {
+ &Reply( $client, "found\n", $userinput);
+ } else {
+ &Failure($client, "not_found\n", $userinput);
+ }
+ return 1;
+}
+®ister_handler("home", \&is_home_handler, 0,1,0);
+
+#
+# Process an update request for a resource?? I think what's going on here is
+# that a resource has been modified that we hold a subscription to.
+# If the resource is not local, then we must update, or at least invalidate our
+# cached copy of the resource.
+# FUTURE WORK:
+# I need to look at this logic carefully. My druthers would be to follow
+# typical caching logic, and simple invalidate the cache, drop any subscription
+# an let the next fetch start the ball rolling again... however that may
+# actually be more difficult than it looks given the complex web of
+# proxy servers.
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+# Implicit inputs:
+# The authentication systems describe above have their own forms of implicit
+# input into the authentication process that are described above.
+#
+sub update_resource_handler {
+
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my $fname= $tail; # This allows interactive testing
+
+
+ my $ownership=ishome($fname);
+ if ($ownership eq 'not_owner') {
+ if (-e $fname) {
+ my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
+ $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
+ my $now=time;
+ my $since=$now-$atime;
+ if ($since>$perlvar{'lonExpire'}) {
+ my $reply=&reply("unsub:$fname","$clientname");
+ unlink("$fname");
+ } else {
+ my $transname="$fname.in.transfer";
+ my $remoteurl=&reply("sub:$fname","$clientname");
+ my $response;
+ alarm(120);
+ {
+ my $ua=new LWP::UserAgent;
+ my $request=new HTTP::Request('GET',"$remoteurl");
+ $response=$ua->request($request,$transname);
+ }
+ alarm(0);
+ if ($response->is_error()) {
+ unlink($transname);
+ my $message=$response->status_line;
+ &logthis("LWP GET: $message for $fname ($remoteurl)");
+ } else {
+ if ($remoteurl!~/\.meta$/) {
+ alarm(120);
+ {
+ my $ua=new LWP::UserAgent;
+ my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
+ my $mresponse=$ua->request($mrequest,$fname.'.meta');
+ if ($mresponse->is_error()) {
+ unlink($fname.'.meta');
+ }
+ }
+ alarm(0);
+ }
+ rename($transname,$fname);
+ }
+ }
+ &Reply( $client, "ok\n", $userinput);
+ } else {
+ &Failure($client, "not_found\n", $userinput);
+ }
+ } else {
+ &Failure($client, "rejected\n", $userinput);
+ }
+ return 1;
+}
+®ister_handler("update", \&update_resource_handler, 0 ,1, 0);
+
+#
+# Fetch a user file from a remote server to the user's home directory
+# userfiles subdir.
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+#
+sub fetch_user_file_handler {
+
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+ my $fname = $tail;
+ my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
+ my $udir=&propath($udom,$uname).'/userfiles';
+ unless (-e $udir) {
+ mkdir($udir,0770);
+ }
+ Debug("fetch user file for $fname");
+ if (-e $udir) {
+ $ufile=~s/^[\.\~]+//;
+
+ # IF necessary, create the path right down to the file.
+ # Note that any regular files in the way of this path are
+ # wiped out to deal with some earlier folly of mine.
+
+ my $path = $udir;
+ if ($ufile =~m|(.+)/([^/]+)$|) {
+ my @parts=split('/',$1);
+ foreach my $part (@parts) {
+ $path .= '/'.$part;
+ if( -f $path) {
+ unlink($path);
+ }
+ 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;
+ Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
+ 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 {
+ Debug("Renaming $transname to $destname");
+ if (!rename($transname,$destname)) {
+ &logthis("Unable to move $transname to $destname");
+ unlink($transname);
+ &Failure($client, "failed\n", $userinput);
+ } else {
+ &Reply($client, "ok\n", $userinput);
+ }
+ }
+ } else {
+ &Failure($client, "not_home\n", $userinput);
+ }
+ return 1;
+}
+®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
+
+#
+# Remove a file from a user's home directory userfiles subdirectory.
+# Parameters:
+# cmd - the Lond request keyword that got us here.
+# tail - the part of the command past the keyword.
+# client- File descriptor connected with the client.
+#
+# Returns:
+# 1 - Continue processing.
+
+sub remove_user_file_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
+
+ my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
+ if ($ufile =~m|/\.\./|) {
+ # any files paths with /../ in them refuse
+ # to deal with
+ &Failure($client, "refused\n", "$cmd:$tail");
+ } else {
+ my $udir = &propath($udom,$uname);
+ if (-e $udir) {
+ my $file=$udir.'/userfiles/'.$ufile;
+ if (-e $file) {
+ unlink($file);
+ if (-e $file) {
+ &Failure($client, "failed\n", "$cmd:$tail");
+ } else {
+ &Reply($client, "ok\n", "$cmd:$tail");
+ }
+ } else {
+ &Failure($client, "not_found\n", "$cmd:$tail");
+ }
+ } else {
+ &Failure($client, "not_home\n", "$cmd:$tail");
+ }
+ }
+ return 1;
+}
+®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
+
+#
+# make a directory in a user's home directory userfiles subdirectory.
+# Parameters:
+# cmd - the Lond request keyword that got us here.
+# tail - the part of the command past the keyword.
+# client- File descriptor connected with the client.
+#
+# Returns:
+# 1 - Continue processing.
+
+sub mkdir_user_file_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
+ $dir=&unescape($dir);
+ my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
+ if ($ufile =~m|/\.\./|) {
+ # any files paths with /../ in them refuse
+ # to deal with
+ &Failure($client, "refused\n", "$cmd:$tail");
+ } else {
+ my $udir = &propath($udom,$uname);
+ if (-e $udir) {
+ my $newdir=$udir.'/userfiles/'.$ufile;
+ if (!-e $newdir) {
+ mkdir($newdir);
+ if (!-e $newdir) {
+ &Failure($client, "failed\n", "$cmd:$tail");
+ } else {
+ &Reply($client, "ok\n", "$cmd:$tail");
+ }
+ } else {
+ &Failure($client, "not_found\n", "$cmd:$tail");
+ }
+ } else {
+ &Failure($client, "not_home\n", "$cmd:$tail");
+ }
+ }
+ return 1;
+}
+®ister_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
+
+#
+# rename a file in a user's home directory userfiles subdirectory.
+# Parameters:
+# cmd - the Lond request keyword that got us here.
+# tail - the part of the command past the keyword.
+# client- File descriptor connected with the client.
+#
+# Returns:
+# 1 - Continue processing.
+
+sub rename_user_file_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my ($udom,$uname,$old,$new) = split(/:/, $tail);
+ $old=&unescape($old);
+ $new=&unescape($new);
+ if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
+ # any files paths with /../ in them refuse to deal with
+ &Failure($client, "refused\n", "$cmd:$tail");
+ } else {
+ my $udir = &propath($udom,$uname);
+ if (-e $udir) {
+ my $oldfile=$udir.'/userfiles/'.$old;
+ my $newfile=$udir.'/userfiles/'.$new;
+ if (-e $newfile) {
+ &Failure($client, "exists\n", "$cmd:$tail");
+ } elsif (! -e $oldfile) {
+ &Failure($client, "not_found\n", "$cmd:$tail");
+ } else {
+ if (!rename($oldfile,$newfile)) {
+ &Failure($client, "failed\n", "$cmd:$tail");
+ } else {
+ &Reply($client, "ok\n", "$cmd:$tail");
+ }
+ }
+ } else {
+ &Failure($client, "not_home\n", "$cmd:$tail");
+ }
+ }
+ return 1;
+}
+®ister_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
+
+
+#
+# Authenticate access to a user file by checking the user's
+# session token(?)
+#
+# Parameters:
+# cmd - The request keyword that dispatched to tus.
+# tail - The tail of the request (colon separated parameters).
+# client - Filehandle open on the client.
+# Return:
+# 1.
+
+sub token_auth_user_file_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my ($fname, $session) = split(/:/, $tail);
+
+ chomp($session);
+ my $reply='non_auth';
+ if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
+ $session.'.id')) {
+ while (my $line=<ENVIN>) {
+ if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
+ }
+ close(ENVIN);
+ &Reply($client, $reply);
+ } else {
+ &Failure($client, "invalid_token\n", "$cmd:$tail");
+ }
+ return 1;
+
+}
+
+®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
+
+
+#
+# Unsubscribe from a resource.
+#
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+#
+sub unsubscribe_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput= "$cmd:$tail";
+
+ my ($fname) = split(/:/,$tail); # Split in case there's extrs.
+
+ &Debug("Unsubscribing $fname");
+ if (-e $fname) {
+ &Debug("Exists");
+ &Reply($client, &unsub($fname,$clientip), $userinput);
+ } else {
+ &Failure($client, "not_found\n", $userinput);
+ }
+ return 1;
+}
+®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
+# Subscribe to a resource
+#
+# Parameters:
+# $cmd - The command that got us here.
+# $tail - Tail of the command (remaining parameters).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+#
+sub subscribe_handler {
+ my ($cmd, $tail, $client)= @_;
+
+ my $userinput = "$cmd:$tail";
+
+ &Reply( $client, &subscribe($userinput,$clientip), $userinput);
+
+ return 1;
+}
+®ister_handler("sub", \&subscribe_handler, 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).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+#
+sub current_version_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput= "$cmd:$tail";
+
+ my $fname = $tail;
+ &Reply( $client, ¤tversion($fname)."\n", $userinput);
+ return 1;
+
+}
+®ister_handler("currentversion", \¤t_version_handler, 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).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+#
+sub activity_log_handler {
+ my ($cmd, $tail, $client) = @_;
+
+
+ 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;
+}
+register_handler("log", \&activity_log_handler, 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).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+#
+sub put_user_profile_entry {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
+ if ($namespace ne 'roles') {
+ chomp($what);
+ my $hashref = &tie_user_hash($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", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ "while attempting put\n",
+ $userinput);
+ }
+ } else {
+ &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
+ "while attempting put\n", $userinput);
+ }
+ } else {
+ &Failure( $client, "refused\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("put", \&put_user_profile_entry, 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).
+# $client - File descriptor connected to client.
+# Returns
+# 0 - Requested to exit, caller should shut down.
+# 1 - Continue processing.
+#
+sub increment_user_value_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
+ if ($namespace ne 'roles') {
+ chomp($what);
+ my $hashref = &tie_user_hash($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", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ "while attempting inc\n", $userinput);
+ }
+ } else {
+ &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting inc\n", $userinput);
+ }
+ } else {
+ &Failure($client, "refused\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("inc", \&increment_user_value_handler, 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.
+# $client - File descriptor connected to the client.
+# Returns:
+# 0 - If the daemon should exit
+# 1 - To continue processing.
+#
+#
+sub roles_put_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
+
+
+ my $namespace='roles';
+ chomp($what);
+ my $hashref = &tie_user_hash($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);
+ &manage_permissions($key, $udom, $uname,
+ &get_auth_type( $udom, $uname));
+ $hashref->{$key}=$value;
+ }
+ if (untie($hashref)) {
+ &Reply($client, "ok\n", $userinput);
+ } else {
+ &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting rolesput\n", $userinput);
+ }
+ } else {
+ &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting rolesput\n", $userinput);
+ }
+ return 1;
+}
+®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
+
+#
+# Deletes (removes) a role for a user. This is equivalent to removing
+# a permissions package associated with the role from the user's profile.
+#
+# Parameters:
+# $cmd - The command (rolesdel)
+# $tail - The remainder of the request line. This consists
+# of:
+# The domain and user requesting the change (logged)
+# The domain and user being changed.
+# The roles being revoked. These are shipped to us
+# as a bunch of & separated role name keywords.
+# $client - The file handle open on the client.
+# Returns:
+# 1 - Continue processing
+# 0 - Exit.
+#
+sub roles_delete_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
+ &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
+ "what = ".$what);
+ my $namespace='roles';
+ chomp($what);
+ my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ &GDBM_WRCREAT(), "D",
+ "$exedom:$exeuser:$what");
+
+ if ($hashref) {
+ my @rolekeys=split(/\&/,$what);
+
+ foreach my $key (@rolekeys) {
+ delete $hashref->{$key};
+ }
+ if (untie(%$hashref)) {
+ &Reply($client, "ok\n", $userinput);
+ } else {
+ &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting rolesdel\n", $userinput);
+ }
+ } else {
+ &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting rolesdel\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
+
+# Unencrypted get from a user's profile database. See
+# GetProfileEntryEncrypted for a version that does end-to-end encryption.
+# This function retrieves a keyed item from a specific named database in the
+# user's directory.
+#
+# Parameters:
+# $cmd - Command request keyword (get).
+# $tail - Tail of the command. This is a colon separated list
+# consisting of the domain and username that uniquely
+# identifies the profile,
+# The 'namespace' which selects the gdbm file to
+# do the lookup in,
+# & separated list of keys to lookup. Note that
+# the values are returned as an & separated list too.
+# $client - File descriptor open on the client.
+# Returns:
+# 1 - Continue processing.
+# 0 - Exit.
+#
+sub get_profile_entry {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput= "$cmd:$tail";
+
+ my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+ chomp($what);
+ my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ &GDBM_READER());
+ if ($hashref) {
+ my @queries=split(/\&/,$what);
+ my $qresult='';
+
+ for (my $i=0;$i<=$#queries;$i++) {
+ $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
+ }
+ $qresult=~s/\&$//; # Remove trailing & from last lookup.
+ if (untie(%$hashref)) {
+ &Reply($client, "$qresult\n", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting get\n", $userinput);
+ }
+ } else {
+ if ($!+0 == 2) { # +0 coerces errno -> number 2 is ENOENT
+ &Failure($client, "error:No such file or ".
+ "GDBM reported bad block error\n", $userinput);
+ } else { # Some other undifferentiated err.
+ &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting get\n", $userinput);
+ }
+ }
+ return 1;
+}
+®ister_handler("get", \&get_profile_entry, 0,1,0);
+
+#
+# Process the encrypted get request. Note that the request is sent
+# in clear, but the reply is encrypted. This is a small covert channel:
+# information about the sensitive keys is given to the snooper. Just not
+# information about the values of the sensitive key. Hmm if I wanted to
+# know these I'd snoop for the egets. Get the profile item names from them
+# and then issue a get for them since there's no enforcement of the
+# requirement of an encrypted get for particular profile items. If I
+# were re-doing this, I'd force the request to be encrypted as well as the
+# reply. I'd also just enforce encrypted transactions for all gets since
+# that would prevent any covert channel snooping.
+#
+# Parameters:
+# $cmd - Command keyword of request (eget).
+# $tail - Tail of the command. See GetProfileEntry
# for more information about this.
+# $client - File open on the client.
+# Returns:
+# 1 - Continue processing
+# 0 - server should exit.
+sub get_profile_entry_encrypted {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
+ chomp($what);
+ my $hashref = &tie_user_hash($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 {
+ &Failure( $client, "error:no_key\n", $userinput);
+ }
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting eget\n", $userinput);
+ }
+ } else {
+ &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting eget\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("eget", \&GetProfileEntryEncrypted, 0, 1, 0);
+#
+# Deletes a key in a user profile database.
+#
+# Parameters:
+# $cmd - Command keyword (del).
+# $tail - Command tail. IN this case a colon
+# separated list containing:
+# The domain and user that identifies uniquely
+# the identity of the user.
+# The profile namespace (name of the profile
+# database file).
+# & separated list of keywords to delete.
+# $client - File open on client socket.
+# Returns:
+# 1 - Continue processing
+# 0 - Exit server.
+#
+#
+
+sub delete_profile_entry {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "cmd:$tail";
+
+ my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+ chomp($what);
+ my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ &GDBM_WRCREAT(),
+ "D",$what);
+ if ($hashref) {
+ my @keys=split(/\&/,$what);
+ foreach my $key (@keys) {
+ delete($hashref->{$key});
+ }
+ if (untie(%$hashref)) {
+ &Reply($client, "ok\n", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting del\n", $userinput);
+ }
+ } else {
+ &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting del\n", $userinput);
+ }
+ return 1;
+}
+®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
+#
+# List the set of keys that are defined in a profile database file.
+# A successful reply from this will contain an & separated list of
+# the keys.
+# Parameters:
+# $cmd - Command request (keys).
+# $tail - Remainder of the request, a colon separated
+# list containing domain/user that identifies the
+# user being queried, and the database namespace
+# (database filename essentially).
+# $client - File open on the client.
+# Returns:
+# 1 - Continue processing.
+# 0 - Exit the server.
+#
+sub get_profile_keys {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$uname,$namespace)=split(/:/,$tail);
+ my $qresult='';
+ my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ &GDBM_READER());
+ if ($hashref) {
+ foreach my $key (keys %$hashref) {
+ $qresult.="$key&";
+ }
+ if (untie(%$hashref)) {
+ $qresult=~s/\&$//;
+ &Reply($client, "$qresult\n", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting keys\n", $userinput);
+ }
+ } else {
+ &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting keys\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
+
+#
+# Dump the contents of a user profile database.
+# Note that this constitutes a very large covert channel too since
+# the dump will return sensitive information that is not encrypted.
+# The naive security assumption is that the session negotiation ensures
+# our client is trusted and I don't believe that's assured at present.
+# Sure want badly to go to ssl or tls. Of course if my peer isn't really
+# a LonCAPA node they could have negotiated an encryption key too so >sigh<.
+#
+# Parameters:
+# $cmd - The command request keyword (currentdump).
+# $tail - Remainder of the request, consisting of a colon
+# separated list that has the domain/username and
+# the namespace to dump (database file).
+# $client - file open on the remote client.
+# Returns:
+# 1 - Continue processing.
+# 0 - Exit the server.
+#
+sub dump_profile_database {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$uname,$namespace) = split(/:/,$tail);
+ my $hashref = &tie_user_hash($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.'&';
+ }
+ }
+ chop($qresult);
+ &Reply($client , "$qresult\n", $userinput);
+ } else {
+ &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting currentdump\n", $userinput);
+ }
+ } else {
+ &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting currentdump\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
+
+#
+# Dump a profile database with an optional regular expression
+# to match against the keys. In this dump, no effort is made
+# to separate symb from version information. Presumably the
+# databases that are dumped by this command are of a different
+# structure. Need to look at this and improve the documentation of
+# both this and the currentdump handler.
+# Parameters:
+# $cmd - The command keyword.
+# $tail - All of the characters after the $cmd:
+# These are expected to be a colon
+# separated list containing:
+# domain/user - identifying the user.
+# namespace - identifying the database.
+# regexp - optional regular expression
+# that is matched against
+# database keywords to do
+# selective dumps.
+# $client - Channel open on the client.
+# Returns:
+# 1 - Continue processing.
+# Side effects:
+# response is written to $client.
+#
+sub dump_with_regexp {
+ my ($cmd, $tail, $client) = @_;
+
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
+ if (defined($regexp)) {
+ $regexp=&unescape($regexp);
+ } else {
+ $regexp='.';
+ }
+ my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ &GDBM_READER());
+ if ($hashref) {
+ my $qresult='';
+ while (my ($key,$value) = each(%$hashref)) {
+ if ($regexp eq '.') {
+ $qresult.=$key.'='.$value.'&';
+ } else {
+ my $unescapeKey = &unescape($key);
+ if (eval('$unescapeKey=~/$regexp/')) {
+ $qresult.="$key=$value&";
+ }
+ }
+ }
+ if (untie(%$hashref)) {
+ chop($qresult);
+ &Reply($client, "$qresult\n", $userinput);
+ } else {
+ &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting dump\n", $userinput);
+ }
+ } else {
+ &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting dump\n", $userinput);
+ }
+
+ return 1;
+}
+
+®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
+
+# Store a set of key=value pairs associated with a versioned name.
+#
+# Parameters:
+# $cmd - Request command keyword.
+# $tail - Tail of the request. This is a colon
+# separated list containing:
+# domain/user - User and authentication domain.
+# namespace - Name of the database being modified
+# rid - Resource keyword to modify.
+# what - new value associated with rid.
+#
+# $client - Socket open on the client.
+#
+#
+# Returns:
+# 1 (keep on processing).
+# Side-Effects:
+# Writes to the client
+sub store_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
+ if ($namespace ne 'roles') {
+
+ chomp($what);
+ my @pairs=split(/\&/,$what);
+ my $hashref = &tie_user_hash($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", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting store\n", $userinput);
+ }
+ } else {
+ &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting store\n", $userinput);
+ }
+ } else {
+ &Failure($client, "refused\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("store", \&store_handler, 0, 1, 0);
+#
+# Dump out all versions of a resource that has key=value pairs associated
+# with it for each version. These resources are built up via the store
+# command.
+#
+# Parameters:
+# $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.
+# $client - socket open on the client.
+#
+# Returns:
+# 1 indicating the caller should not yet exit.
+# Side-effects:
+# Writes a reply to the client.
+# The reply is a string of the following shape:
+# version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
+# Where the 1 above represents version 1.
+# this continues for all pairs of keys in all versions.
+#
+#
+#
+#
+sub restore_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail"; # Only used for logging purposes.
+
+ my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
+ $namespace=~s/\//\_/g;
+ $namespace=~s/\W//g;
+ chomp($rid);
+ my $proname=&propath($udom,$uname);
+ my $qresult='';
+ my %hash;
+ if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
+ &GDBM_READER(),0640)) {
+ my $version=$hash{"version:$rid"};
+ $qresult.="version=$version&";
+ my $scope;
+ for ($scope=1;$scope<=$version;$scope++) {
+ my $vkeys=$hash{"$scope:keys:$rid"};
+ my @keys=split(/:/,$vkeys);
+ my $key;
+ $qresult.="$scope:keys=$vkeys&";
+ foreach $key (@keys) {
+ $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
+ }
+ }
+ if (untie(%hash)) {
+ $qresult=~s/\&$//;
+ &Reply( $client, "$qresult\n", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting restore\n", $userinput);
+ }
+ } else {
+ &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting restore\n", $userinput);
+ }
+
+ return 1;
+
+
+}
+®ister_handler("restore", \&restore_handler, 0,1,0);
+
+#
+# Add a chat message to to a discussion board.
+#
+# Parameters:
+# $cmd - Request keyword.
+# $tail - Tail of the command. A colon separated list
+# containing:
+# cdom - Domain on which the chat board lives
+# cnum - Identifier of the discussion group.
+# post - Body of the posting.
+# $client - Socket open on the client.
+# Returns:
+# 1 - Indicating caller should keep on processing.
+#
+# Side-effects:
+# writes a reply to the client.
+#
+#
+sub send_chat_handler {
+ my ($cmd, $tail, $client) = @_;
+
+
+ my $userinput = "$cmd:$tail";
+
+ my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
+ &chat_add($cdom,$cnum,$newpost);
+ &Reply($client, "ok\n", $userinput);
+
+ return 1;
+}
+®ister_handler("chatsend", \&send_chat_handler, 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.
+# $client - Socket open on the client program.
+# Returns:
+# 1 - continue processing
+# Side effects:
+# Response is written to the client.
+#
+sub retrieve_chat_handler {
+ my ($cmd, $tail, $client) = @_;
+
+
+ my $userinput = "$cmd:$tail";
+
+ my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
+ my $reply='';
+ foreach (&get_chat($cdom,$cnum,$udom,$uname)) {
+ $reply.=&escape($_).':';
+ }
+ $reply=~s/\:$//;
+ &Reply($client, $reply."\n", $userinput);
+
+
+ return 1;
+}
+®ister_handler("chatretr", \&retrieve_chat_handler, 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 $client.
+#
+sub send_query_handler {
+ my ($cmd, $tail, $client) = @_;
+
+
+ my $userinput = "$cmd:$tail";
+
+ my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
+ $query=~s/\n*$//g;
+ &Reply($client, "". &sql_reply("$clientname\&$query".
+ "\&$arg1"."\&$arg2"."\&$arg3")."\n",
+ $userinput);
+
+ return 1;
+}
+®ister_handler("querysend", \&send_query_handler, 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.
+# $client - Socket open on the client.
+# Return:
+# 1 - Indicating that we should continue processing.
+# Side effects:
+# ok written to the client.
+#
+sub reply_query_handler {
+ my ($cmd, $tail, $client) = @_;
+
+
+ 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", $userinput);
+ }
+
+
+ return 1;
+}
+®ister_handler("queryreply", \&reply_query_handler, 0, 1, 0);
+
+#
+# Process the courseidput request. Not quite sure what this means
+# at the system level sense. It appears a gdbm file in the
+# /home/httpd/lonUsers/$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.
+# $client - Socket open on the client.
+# Returns:
+# 1 - indicating that processing should continue
+#
+# Side effects:
+# reply is written to the client.
+#
+sub put_course_id_handler {
+ my ($cmd, $tail, $client) = @_;
+
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom, $what) = split(/:/, $tail);
+ chomp($what);
+ my $now=time;
+ my @pairs=split(/\&/,$what);
+
+ my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+ if ($hashref) {
+ foreach my $pair (@pairs) {
+ my ($key,$value)=split(/=/,$pair);
+ $hashref->{$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 {
+ &Failure( $client, "error: ".($!+0)
+ ." tie(GDBM) Failed ".
+ "while attempting courseidput\n", $userinput);
+ }
+
+ return 1;
+}
+®ister_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
+
+# Retrieves the value of a course id resource keyword pattern
+# defined since a starting date. Both the starting date and the
+# keyword pattern are optional. If the starting date is not supplied it
+# is treated as the beginning of time. If the pattern is not found,
+# it is treatred as "." matching everything.
+#
+# Parameters:
+# $cmd - Command keyword that resulted in us being dispatched.
+# $tail - The remainder of the command that, in this case, consists
+# of a colon separated list of:
+# domain - The domain in which the course database is
+# defined.
+# since - Optional parameter describing the minimum
+# time of definition(?) of the resources that
+# will match the dump.
+# description - regular expression that is used to filter
+# the dump. Only keywords matching this regexp
+# will be used.
+# $client - The socket open on the client.
+# Returns:
+# 1 - Continue processing.
+# Side Effects:
+# a reply is written to $client.
+sub dump_course_id_handler {
+ my ($cmd, $tail, $client) = @_;
+
+ my $userinput = "$cmd:$tail";
+
+ my ($udom,$since,$description) =split(/:/,$tail);
+ if (defined($description)) {
+ $description=&unescape($description);
+ } else {
+ $description='.';
+ }
+ unless (defined($since)) { $since=0; }
+ my $qresult='';
+ my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+ if ($hashref) {
+ while (my ($key,$value) = each(%$hashref)) {
+ my ($descr,$lasttime,$inst_code);
+ if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
+ ($descr,$inst_code,$lasttime)=($1,$2,$3);
+ } else {
+ ($descr,$lasttime) = split(/\:/,$value);
+ }
+ if ($lasttime<$since) { next; }
+ if ($description eq '.') {
+ $qresult.=$key.'='.$descr.':'.$inst_code.'&';
+ } else {
+ my $unescapeVal = &unescape($descr);
+ if (eval('$unescapeVal=~/\Q$description\E/i')) {
+ $qresult.=$key.'='.$descr.':'.$inst_code.'&';
+ }
+ }
+ }
+ if (untie(%$hashref)) {
+ chop($qresult);
+ &Reply($client, "$qresult\n", $userinput);
+ } else {
+ &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ "while attempting courseiddump\n", $userinput);
+ }
+ } else {
+ &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ "while attempting courseiddump\n", $userinput);
+ }
+
+
+ return 1;
+}
+®ister_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
+#
+#
+#
+#---------------------------------------------------------------
+#
+# Getting, decoding and dispatching requests:
+#
+
+#
+# Get a Request:
+# Gets a Request message from the client. The transaction
+# is defined as a 'line' of text. We remove the new line
+# from the text line.
+#
+sub get_request {
+ my $input = <$client>;
+ chomp($input);
+
+ &Debug("get_request: Request = $input\n");
+
+ &status('Processing '.$clientname.':'.$input);
+
+ return $input;
+}
+#---------------------------------------------------------------
+#
+# Process a request. This sub should shrink as each action
+# gets farmed out into a separat sub that is registered
+# with the dispatch hash.
+#
+# Parameters:
+# user_input - The request received from the client (lonc).
+# Returns:
+# true to keep processing, false if caller should exit.
+#
+sub process_request {
+ my ($userinput) = @_; # Easier for now to break style than to
+ # fix all the userinput -> user_input.
+ my $wasenc = 0; # True if request was encrypted.
+# ------------------------------------------------------------ See if encrypted
+ if ($userinput =~ /^enc/) {
+ $userinput = decipher($userinput);
+ $wasenc=1;
+ if(!$userinput) { # Cipher not defined.
+ &Failure($client, "error: Encrypted data without negotated key");
+ return 0;
+ }
+ }
+ Debug("process_request: $userinput\n");
+
+ #
+ # The 'correct way' to add a command to lond is now to
+ # write a sub to execute it and Add it to the command dispatch
+ # hash via a call to register_handler.. The comments to that
+ # sub should give you enough to go on to show how to do this
+ # along with the examples that are building up as this code
+ # is getting refactored. Until all branches of the
+ # if/elseif monster below have been factored out into
+ # separate procesor subs, if the dispatch hash is missing
+ # the command keyword, we will fall through to the remainder
+ # of the if/else chain below in order to keep this thing in
+ # working order throughout the transmogrification.
+
+ my ($command, $tail) = split(/:/, $userinput, 2);
+ chomp($command);
+ chomp($tail);
+ $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
+ $command =~ s/(\r)//; # And this too for parameterless commands.
+ if(!$tail) {
+ $tail =""; # defined but blank.
+ }
+
+ &Debug("Command received: $command, encoded = $wasenc");
+
+ if(defined $Dispatcher{$command}) {
+
+ my $dispatch_info = $Dispatcher{$command};
+ my $handler = $$dispatch_info[0];
+ my $need_encode = $$dispatch_info[1];
+ my $client_types = $$dispatch_info[2];
+ Debug("Matched dispatch hash: mustencode: $need_encode "
+ ."ClientType $client_types");
+
+ # Validate the request:
+
+ my $ok = 1;
+ my $requesterprivs = 0;
+ if(&isClient()) {
+ $requesterprivs |= $CLIENT_OK;
+ }
+ if(&isManager()) {
+ $requesterprivs |= $MANAGER_OK;
+ }
+ if($need_encode && (!$wasenc)) {
+ Debug("Must encode but wasn't: $need_encode $wasenc");
+ $ok = 0;
+ }
+ if(($client_types & $requesterprivs) == 0) {
+ Debug("Client not privileged to do this operation");
+ $ok = 0;
+ }
+
+ if($ok) {
+ Debug("Dispatching to handler $command $tail");
+ my $keep_going = &$handler($command, $tail, $client);
+ return $keep_going;
+ } else {
+ Debug("Refusing to dispatch because client did not match requirements");
+ Failure($client, "refused\n", $userinput);
+ return 1;
+ }
+
+ }
+
+#------------------- Commands not yet in spearate handlers. --------------
+
+
+# ----------------------------------------------------------------------- idput
+ if ($userinput =~ /^idput/) {
+ if(isClient) {
+ my ($cmd,$udom,$what)=split(/:/,$userinput);
+ chomp($what);
+ $udom=~s/\W//g;
+ my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
+ my $now=time;
+ my @pairs=split(/\&/,$what);
+ my %hash;
+ if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
+ {
+ my $hfh;
+ if ($hfh=IO::File->new(">>$proname.hist")) {
+ print $hfh "P:$now:$what\n";
+ }
+ }
+ foreach my $pair (@pairs) {
+ my ($key,$value)=split(/=/,$pair);
+ $hash{$key}=$value;
+ }
+ if (untie(%hash)) {
+ print $client "ok\n";
+ } else {
+ print $client "error: ".($!+0)
+ ." untie(GDBM) Failed ".
+ "while attempting idput\n";
+ }
+ } else {
+ print $client "error: ".($!+0)
+ ." tie(GDBM) Failed ".
+ "while attempting idput\n";
+ }
+ } else {
+ Reply($client, "refused\n", $userinput);
+
+ }
+# ----------------------------------------------------------------------- idget
+ } elsif ($userinput =~ /^idget/) {
+ if(isClient) {
+ my ($cmd,$udom,$what)=split(/:/,$userinput);
+ chomp($what);
+ $udom=~s/\W//g;
+ my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
+ my @queries=split(/\&/,$what);
+ my $qresult='';
+ my %hash;
+ if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
+ for (my $i=0;$i<=$#queries;$i++) {
+ $qresult.="$hash{$queries[$i]}&";
+ }
+ if (untie(%hash)) {
+ $qresult=~s/\&$//;
+ print $client "$qresult\n";
+ } else {
+ print $client "error: ".($!+0)
+ ." untie(GDBM) Failed ".
+ "while attempting idget\n";
+ }
+ } else {
+ print $client "error: ".($!+0)
+ ." tie(GDBM) Failed ".
+ "while attempting idget\n";
+ }
+ } else {
+ Reply($client, "refused\n", $userinput);
+
+ }
+# ---------------------------------------------------------------------- tmpput
+ } elsif ($userinput =~ /^tmpput/) {
+ if(isClient) {
+ my ($cmd,$what)=split(/:/,$userinput);
+ my $store;
+ $tmpsnum++;
+ my $id=$$.'_'.$clientip.'_'.$tmpsnum;
+ $id=~s/\W/\_/g;
+ $what=~s/\n//g;
+ my $execdir=$perlvar{'lonDaemons'};
+ if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
+ print $store $what;
+ close $store;
+ print $client "$id\n";
+ }
+ else {
+ print $client "error: ".($!+0)
+ ."IO::File->new Failed ".
+ "while attempting tmpput\n";
+ }
+ } else {
+ Reply($client, "refused\n", $userinput);
+
+ }
+
+# ---------------------------------------------------------------------- tmpget
+ } elsif ($userinput =~ /^tmpget/) {
+ if(isClient) {
+ my ($cmd,$id)=split(/:/,$userinput);
+ chomp($id);
+ $id=~s/\W/\_/g;
+ my $store;
+ my $execdir=$perlvar{'lonDaemons'};
+ if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
+ my $reply=<$store>;
+ print $client "$reply\n";
+ close $store;
+ }
+ else {
+ print $client "error: ".($!+0)
+ ."IO::File->new Failed ".
+ "while attempting tmpget\n";
+ }
+ } else {
+ Reply($client, "refused\n", $userinput);
+
+ }
+# ---------------------------------------------------------------------- tmpdel
+ } elsif ($userinput =~ /^tmpdel/) {
+ if(isClient) {
+ my ($cmd,$id)=split(/:/,$userinput);
+ chomp($id);
+ $id=~s/\W/\_/g;
+ my $execdir=$perlvar{'lonDaemons'};
+ if (unlink("$execdir/tmp/$id.tmp")) {
+ print $client "ok\n";
+ } else {
+ print $client "error: ".($!+0)
+ ."Unlink tmp Failed ".
+ "while attempting tmpdel\n";
+ }
+ } else {
+ Reply($client, "refused\n", $userinput);
+
+ }
+# -------------------------------------------------------------------------- ls
+ } elsif ($userinput =~ /^ls/) {
+ if(isClient) {
+ my $obs;
+ my $rights;
+ my ($cmd,$ulsdir)=split(/:/,$userinput);
+ my $ulsout='';
+ my $ulsfn;
+ if (-e $ulsdir) {
+ if(-d $ulsdir) {
+ if (opendir(LSDIR,$ulsdir)) {
+ while ($ulsfn=readdir(LSDIR)) {
+ undef $obs, $rights;
+ my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+ #We do some obsolete checking here
+ if(-e $ulsdir.'/'.$ulsfn.".meta") {
+ open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+ my @obsolete=<FILE>;
+ foreach my $obsolete (@obsolete) {
+ if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
+ if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
+ }
+ }
+ $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
+ if($obs eq '1') { $ulsout.="&1"; }
+ else { $ulsout.="&0"; }
+ if($rights eq '1') { $ulsout.="&1:"; }
+ else { $ulsout.="&0:"; }
+ }
+ closedir(LSDIR);
+ }
+ } else {
+ my @ulsstats=stat($ulsdir);
+ $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+ }
+ } else {
+ $ulsout='no_such_dir';
+ }
+ if ($ulsout eq '') { $ulsout='empty'; }
+ print $client "$ulsout\n";
+ } else {
+ Reply($client, "refused\n", $userinput);
+
+ }
+# ----------------------------------------------------------------- setannounce
+ } elsif ($userinput =~ /^setannounce/) {
+ if (isClient) {
+ my ($cmd,$announcement)=split(/:/,$userinput);
+ chomp($announcement);
+ $announcement=&unescape($announcement);
+ if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
+ '/announcement.txt')) {
+ print $store $announcement;
+ close $store;
+ print $client "ok\n";
+ } else {
+ print $client "error: ".($!+0)."\n";
+ }
+ } else {
+ Reply($client, "refused\n", $userinput);
+
+ }
+# ------------------------------------------------------------------ Hanging up
+ } elsif (($userinput =~ /^exit/) ||
+ ($userinput =~ /^init/)) { # no restrictions.
+ &logthis(
+ "Client $clientip ($clientname) hanging up: $userinput");
+ print $client "bye\n";
+ $client->shutdown(2); # shutdown the socket forcibly.
+ $client->close();
+ return 0;
+
+# ---------------------------------- set current host/domain
+ } elsif ($userinput =~ /^sethost/) {
+ if (isClient) {
+ print $client &sethost($userinput)."\n";
+ } else {
+ print $client "refused\n";
+ }
+#---------------------------------- request file (?) version.
+ } elsif ($userinput =~/^version/) {
+ if (isClient) {
+ print $client &version($userinput)."\n";
+ } else {
+ print $client "refused\n";
+ }
+#------------------------------- is auto-enrollment enabled?
+ } elsif ($userinput =~/^autorun/) {
+ if (isClient) {
+ my ($cmd,$cdom) = split(/:/,$userinput);
+ my $outcome = &localenroll::run($cdom);
+ print $client "$outcome\n";
+ } else {
+ print $client "0\n";
+ }
+#------------------------------- get official sections (for auto-enrollment).
+ } elsif ($userinput =~/^autogetsections/) {
+ if (isClient) {
+ my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
+ my @secs = &localenroll::get_sections($coursecode,$cdom);
+ my $seclist = &escape(join(':',@secs));
+ print $client "$seclist\n";
+ } else {
+ print $client "refused\n";
+ }
+#----------------------- validate owner of new course section (for auto-enrollment).
+ } elsif ($userinput =~/^autonewcourse/) {
+ if (isClient) {
+ my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
+ my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
+ print $client "$outcome\n";
+ } else {
+ print $client "refused\n";
+ }
+#-------------- validate course section in schedule of classes (for auto-enrollment).
+ } elsif ($userinput =~/^autovalidatecourse/) {
+ if (isClient) {
+ my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
+ my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
+ print $client "$outcome\n";
+ } else {
+ print $client "refused\n";
+ }
+#--------------------------- create password for new user (for auto-enrollment).
+ } elsif ($userinput =~/^autocreatepassword/) {
+ if (isClient) {
+ my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
+ my ($create_passwd,$authchk);
+ ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
+ print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
+ } else {
+ print $client "refused\n";
+ }
+#--------------------------- read and remove temporary files (for auto-enrollment).
+ } elsif ($userinput =~/^autoretrieve/) {
+ if (isClient) {
+ my ($cmd,$filename) = split(/:/,$userinput);
+ my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
+ if ( (-e $source) && ($filename ne '') ) {
+ my $reply = '';
+ if (open(my $fh,$source)) {
+ while (<$fh>) {
+ chomp($_);
+ $_ =~ s/^\s+//g;
+ $_ =~ s/\s+$//g;
+ $reply .= $_;
+ }
+ close($fh);
+ print $client &escape($reply)."\n";
+# unlink($source);
+ } else {
+ print $client "error\n";
+ }
+ } else {
+ print $client "error\n";
+ }
+ } else {
+ print $client "refused\n";
+ }
+#--------------------- read and retrieve institutional code format (for support form).
+ } elsif ($userinput =~/^autoinstcodeformat/) {
+ if (isClient) {
+ my $reply;
+ my($cmd,$cdom,$course) = split(/:/,$userinput);
+ my @pairs = split/\&/,$course;
+ my %instcodes = ();
+ my %codes = ();
+ my @codetitles = ();
+ my %cat_titles = ();
+ my %cat_order = ();
+ foreach (@pairs) {
+ my ($key,$value) = split/=/,$_;
+ $instcodes{&unescape($key)} = &unescape($value);
+ }
+ my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
+ if ($formatreply eq 'ok') {
+ my $codes_str = &hash2str(%codes);
+ my $codetitles_str = &array2str(@codetitles);
+ my $cat_titles_str = &hash2str(%cat_titles);
+ my $cat_order_str = &hash2str(%cat_order);
+ print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
+ }
+ } else {
+ print $client "refused\n";
+ }
+# ------------------------------------------------------------- unknown command
+
+ } else {
+ # unknown command
+ print $client "unknown_cmd\n";
+ }
+# -------------------------------------------------------------------- complete
+ Debug("process_request - returning 1");
+ return 1;
+}
+#
+# Decipher encoded traffic
+# Parameters:
+# input - Encoded data.
+# Returns:
+# Decoded data or undef if encryption key was not yet negotiated.
+# Implicit input:
+# cipher - This global holds the negotiated encryption key.
+#
+sub decipher {
+ my ($input) = @_;
+ my $output = '';
+
+
+ if($cipher) {
+ my($enc, $enclength, $encinput) = split(/:/, $input);
+ for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
+ $output .=
+ $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
+ }
+ return substr($output, 0, $enclength);
+ } else {
+ return undef;
+ }
+}
+
+#
+# Register a command processor. This function is invoked to register a sub
+# to process a request. Once registered, the ProcessRequest sub can automatically
+# dispatch requests to an appropriate sub, and do the top level validity checking
+# as well:
+# - Is the keyword recognized.
+# - Is the proper client type attempting the request.
+# - Is the request encrypted if it has to be.
+# Parameters:
+# $request_name - Name of the request being registered.
+# This is the command request that will match
+# against the hash keywords to lookup the information
+# associated with the dispatch information.
+# $procedure - Reference to a sub to call to process the request.
+# All subs get called as follows:
+# Procedure($cmd, $tail, $replyfd, $key)
+# $cmd - the actual keyword that invoked us.
+# $tail - the tail of the request that invoked us.
+# $replyfd- File descriptor connected to the client
+# $must_encode - True if the request must be encoded to be good.
+# $client_ok - True if it's ok for a client to request this.
+# $manager_ok - True if it's ok for a manager to request this.
+# Side effects:
+# - On success, the Dispatcher hash has an entry added for the key $RequestName
+# - On failure, the program will die as it's a bad internal bug to try to
+# register a duplicate command handler.
+#
+sub register_handler {
+ my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
+
+ # Don't allow duplication#
+
+ if (defined $Dispatcher{$request_name}) {
+ die "Attempting to define a duplicate request handler for $request_name\n";
+ }
+ # Build the client type mask:
+
+ my $client_type_mask = 0;
+ if($client_ok) {
+ $client_type_mask |= $CLIENT_OK;
+ }
+ if($manager_ok) {
+ $client_type_mask |= $MANAGER_OK;
+ }
+
+ # Enter the hash:
+
+ my @entry = ($procedure, $must_encode, $client_type_mask);
+
+ $Dispatcher{$request_name} = \@entry;
+
+}
+
+
+#------------------------------------------------------------------
+
+
+
+
+#
+# Convert an error return code from lcpasswd to a string value.
+#
+sub lcpasswdstrerror {
+ my $ErrorCode = shift;
+ if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
+ return "lcpasswd Unrecognized error return value ".$ErrorCode;
+ } else {
+ return $passwderrors[$ErrorCode];
+ }
+}
+
+#
+# Convert an error return code from lcuseradd to a string value:
+#
+sub lcuseraddstrerror {
+ my $ErrorCode = shift;
+ if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
+ return "lcuseradd - Unrecognized error code: ".$ErrorCode;
+ } else {
+ return $adderrors[$ErrorCode];
+ }
+}
# grabs exception and records it to log before exiting
sub catchexception {
my ($error)=@_;
$SIG{'QUIT'}='DEFAULT';
$SIG{__DIE__}='DEFAULT';
- &logthis("<font color=red>CRITICAL: "
- ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
+ &status("Catching exception");
+ &logthis("<font color='red'>CRITICAL: "
+ ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
."a crash with this error msg->[$error]</font>");
+ &logthis('Famous last words: '.$status.' - '.$lastlog);
if ($client) { print $client "error: $error\n"; }
+ $server->close();
die($error);
}
-
+sub timeout {
+ &status("Handling Timeout");
+ &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
+ &catchexception('Timeout');
+}
# -------------------------------- Set signal handlers to record abnormal exits
+
$SIG{'QUIT'}=\&catchexception;
$SIG{__DIE__}=\&catchexception;
-# ------------------------------------ Read httpd access.conf and get variables
-
-open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
-
-while ($configline=<CONFIG>) {
- if ($configline =~ /PerlSetVar/) {
- my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
- chomp($varvalue);
- $perlvar{$varname}=$varvalue;
- }
-}
-close(CONFIG);
+# ---------------------------------- Read loncapa_apache.conf and loncapa.conf
+&status("Read loncapa.conf and loncapa_apache.conf");
+my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
+%perlvar=%{$perlvarref};
+undef $perlvarref;
# ----------------------------- Make sure this process is running from user=www
my $wwwid=getpwnam('www');
if ($wwwid!=$<) {
- $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
- $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
+ my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
+ my $subj="LON: $currenthostid User ID mismatch";
system("echo 'User ID mismatch. lond must be run as user www.' |\
mailto $emailto -s '$subj' > /dev/null");
exit 1;
@@ -84,20 +3666,9 @@ if (-e $pidfile) {
if (kill 0 => $pide) { die "already running"; }
}
-$PREFORK=4; # number of children to maintain, at least four spare
-
# ------------------------------------------------------------- Read hosts file
-open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
-while ($configline=<CONFIG>) {
- my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
- chomp($ip);
- $hostid{$ip}=$id;
- if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
- $PREFORK++;
-}
-close(CONFIG);
# establish SERVER socket, bind and listen.
$server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
@@ -111,38 +3682,194 @@ $server = IO::Socket::INET->new(LocalPor
# global variables
-$MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should
- # process
-%children = (); # keys are current child process IDs
-$children = 0; # current number of children
+my %children = (); # keys are current child process IDs
sub REAPER { # takes care of dead children
$SIG{CHLD} = \&REAPER;
- my $pid = wait;
- $children --;
- &logthis("Child $pid died");
- delete $children{$pid};
+ &status("Handling child death");
+ my $pid;
+ do {
+ $pid = waitpid(-1,&WNOHANG());
+ if (defined($children{$pid})) {
+ &logthis("Child $pid died");
+ delete($children{$pid});
+ } 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");
}
sub HUNTSMAN { # signal handler for SIGINT
+ &status("Killing children (INT)");
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
kill 'INT' => keys %children;
+ &logthis("Free socket: ".shutdown($server,2)); # free up socket
my $execdir=$perlvar{'lonDaemons'};
unlink("$execdir/logs/lond.pid");
- &logthis("<font color=red>CRITICAL: Shutting down</font>");
+ &logthis("<font color='red'>CRITICAL: Shutting down</font>");
+ &status("Done killing children");
exit; # clean up with dignity
}
sub HUPSMAN { # signal handler for SIGHUP
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
+ &status("Killing children for restart (HUP)");
kill 'INT' => keys %children;
- close($server); # free up socket
- &logthis("<font color=red>CRITICAL: Restarting</font>");
- unlink("$execdir/logs/lond.pid");
+ &logthis("Free socket: ".shutdown($server,2)); # free up socket
+ &logthis("<font color='red'>CRITICAL: Restarting</font>");
my $execdir=$perlvar{'lonDaemons'};
+ unlink("$execdir/logs/lond.pid");
+ &status("Restarting self (HUP)");
exec("$execdir/lond"); # here we go again
}
+#
+# Kill off hashes that describe the host table prior to re-reading it.
+# Hashes affected are:
+# %hostid, %hostdom %hostip %hostdns.
+#
+sub KillHostHashes {
+ foreach my $key (keys %hostid) {
+ delete $hostid{$key};
+ }
+ foreach my $key (keys %hostdom) {
+ delete $hostdom{$key};
+ }
+ foreach my $key (keys %hostip) {
+ delete $hostip{$key};
+ }
+ foreach my $key (keys %hostdns) {
+ delete $hostdns{$key};
+ }
+}
+#
+# Read in the host table from file and distribute it into the various hashes:
+#
+# - %hostid - Indexed by IP, the loncapa hostname.
+# - %hostdom - Indexed by loncapa hostname, the domain.
+# - %hostip - Indexed by hostid, the Ip address of the host.
+sub ReadHostTable {
+
+ open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
+ my $myloncapaname = $perlvar{'lonHostID'};
+ Debug("My loncapa name is : $myloncapaname");
+ while (my $configline=<CONFIG>) {
+ if (!($configline =~ /^\s*\#/)) {
+ my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
+ chomp($ip); $ip=~s/\D+$//;
+ $hostid{$ip}=$id; # LonCAPA name of host by IP.
+ $hostdom{$id}=$domain; # LonCAPA domain name of host.
+ $hostip{$id}=$ip; # IP address of host.
+ $hostdns{$name} = $id; # LonCAPA name of host by DNS.
+
+ if ($id eq $perlvar{'lonHostID'}) {
+ Debug("Found me in the host table: $name");
+ $thisserver=$name;
+ }
+ }
+ }
+ close(CONFIG);
+}
+#
+# Reload the Apache daemon's state.
+# This is done by invoking /home/httpd/perl/apachereload
+# a setuid perl script that can be root for us to do this job.
+#
+sub ReloadApache {
+ my $execdir = $perlvar{'lonDaemons'};
+ my $script = $execdir."/apachereload";
+ system($script);
+}
+
+#
+# Called in response to a USR2 signal.
+# - Reread hosts.tab
+# - All children connected to hosts that were removed from hosts.tab
+# are killed via SIGINT
+# - All children connected to previously existing hosts are sent SIGUSR1
+# - Our internal hosts hash is updated to reflect the new contents of
+# hosts.tab causing connections from hosts added to hosts.tab to
+# now be honored.
+#
+sub UpdateHosts {
+ &status("Reload hosts.tab");
+ logthis('<font color="blue"> Updating connections </font>');
+ #
+ # The %children hash has the set of IP's we currently have children
+ # on. These need to be matched against records in the hosts.tab
+ # Any ip's no longer in the table get killed off they correspond to
+ # either dropped or changed hosts. Note that the re-read of the table
+ # will take care of new and changed hosts as connections come into being.
+
+
+ KillHostHashes;
+ ReadHostTable;
+
+ foreach my $child (keys %children) {
+ my $childip = $children{$child};
+ if(!$hostid{$childip}) {
+ logthis('<font color="blue"> UpdateHosts killing child '
+ ." $child for ip $childip </font>");
+ kill('INT', $child);
+ } else {
+ logthis('<font color="green"> keeping child for ip '
+ ." $childip (pid=$child) </font>");
+ }
+ }
+ ReloadApache;
+ &status("Finished reloading hosts.tab");
+}
+
+
+sub checkchildren {
+ &status("Checking on the children (sending signals)");
+ &initnewstatus();
+ &logstatus();
+ &logthis('Going to check on the children');
+ my $docdir=$perlvar{'lonDocRoot'};
+ foreach (sort keys %children) {
+ #sleep 1;
+ unless (kill 'USR1' => $_) {
+ &logthis ('Child '.$_.' is dead');
+ &logstatus($$.' is dead');
+ delete($children{$_});
+ }
+ }
+ sleep 5;
+ $SIG{ALRM} = sub { Debug("timeout");
+ die "timeout"; };
+ $SIG{__DIE__} = 'DEFAULT';
+ &status("Checking on the children (waiting for reports)");
+ foreach (sort keys %children) {
+ unless (-e "$docdir/lon-status/londchld/$_.txt") {
+ eval {
+ alarm(300);
+ &logthis('Child '.$_.' did not respond');
+ kill 9 => $_;
+ #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
+ #$subj="LON: $currenthostid killed lond process $_";
+ #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
+ #$execdir=$perlvar{'lonDaemons'};
+ #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
+ delete($children{$_});
+ alarm(0);
+ }
+ }
+ }
+ $SIG{ALRM} = 'DEFAULT';
+ $SIG{__DIE__} = \&catchexception;
+ &status("Finished checking children");
+ &logthis('Finished Checking children');
+}
+
# --------------------------------------------------------------------- Logging
sub logthis {
@@ -151,9 +3878,104 @@ sub logthis {
my $fh=IO::File->new(">>$execdir/logs/lond.log");
my $now=time;
my $local=localtime($now);
+ $lastlog=$local.': '.$message;
print $fh "$local ($$): $message\n";
}
+# ------------------------- Conditional log if $DEBUG true.
+sub Debug {
+ my $message = shift;
+ if($DEBUG) {
+ &logthis($message);
+ }
+}
+
+#
+# Sub to do replies to client.. this gives a hook for some
+# debug tracing too:
+# Parameters:
+# fd - File open on client.
+# reply - Text to send to client.
+# request - Original request from client.
+#
+sub Reply {
+ my ($fd, $reply, $request) = @_;
+ print $fd $reply;
+ Debug("Request was $request Reply was $reply");
+
+ $Transactions++;
+
+
+}
+
+
+#
+# Sub to report a failure.
+# This function:
+# - Increments the failure statistic counters.
+# - Invokes Reply to send the error message to the client.
+# Parameters:
+# fd - File descriptor open on the client
+# reply - Reply text to emit.
+# request - The original request message (used by Reply
+# to debug if that's enabled.
+# Implicit outputs:
+# $Failures- The number of failures is incremented.
+# Reply (invoked here) sends a message to the
+# client:
+#
+sub Failure {
+ my $fd = shift;
+ my $reply = shift;
+ my $request = shift;
+
+ $Failures++;
+ Reply($fd, $reply, $request); # That's simple eh?
+}
+# ------------------------------------------------------------------ Log status
+
+sub logstatus {
+ &status("Doing logging");
+ my $docdir=$perlvar{'lonDocRoot'};
+ {
+ my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
+ print $fh $status."\n".$lastlog."\n".time."\n$keymode";
+ $fh->close();
+ }
+ &status("Finished $$.txt");
+ {
+ open(LOG,">>$docdir/lon-status/londstatus.txt");
+ flock(LOG,LOCK_EX);
+ print LOG $$."\t".$clientname."\t".$currenthostid."\t"
+ .$status."\t".$lastlog."\t $keymode\n";
+ flock(DB,LOCK_UN);
+ close(LOG);
+ }
+ &status("Finished logging");
+}
+
+sub initnewstatus {
+ my $docdir=$perlvar{'lonDocRoot'};
+ my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
+ my $now=time;
+ my $local=localtime($now);
+ print $fh "LOND status $local - parent $$\n\n";
+ opendir(DIR,"$docdir/lon-status/londchld");
+ while (my $filename=readdir(DIR)) {
+ unlink("$docdir/lon-status/londchld/$filename");
+ }
+ closedir(DIR);
+}
+
+# -------------------------------------------------------------- Status setting
+
+sub status {
+ my $what=shift;
+ my $now=time;
+ my $local=localtime($now);
+ $status=$local.': '.$what;
+ $0='lond: '.$what.' '.$local;
+}
# -------------------------------------------------------- Escape Special Chars
@@ -183,20 +4005,13 @@ sub reconlonc {
if (kill 0 => $loncpid) {
&logthis("lonc at pid $loncpid responding, sending USR1");
kill USR1 => $loncpid;
- sleep 1;
- if (-e "$peerfile") { return; }
- &logthis("$peerfile still not there, give it another try");
- sleep 5;
- if (-e "$peerfile") { return; }
- &logthis(
- "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
} else {
&logthis(
- "<font color=red>CRITICAL: "
+ "<font color='red'>CRITICAL: "
."lonc at pid $loncpid not responding, giving up</font>");
}
} else {
- &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
+ &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
}
}
@@ -219,11 +4034,12 @@ sub subreply {
sub reply {
my ($cmd,$server)=@_;
my $answer;
- if ($server ne $perlvar{'lonHostID'}) {
+ if ($server ne $currenthostid) {
$answer=subreply($cmd,$server);
if ($answer eq 'con_lost') {
$answer=subreply("ping",$server);
if ($answer ne $server) {
+ &logthis("sub reply: answer != server answer is $answer, server is $server");
&reconlonc("$perlvar{'lonSockDir'}/$server");
}
$answer=subreply($cmd,$server);
@@ -236,14 +4052,14 @@ sub reply {
# -------------------------------------------------------------- Talk to lonsql
-sub sqlreply {
+sub sql_reply {
my ($cmd)=@_;
- my $answer=subsqlreply($cmd);
- if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
+ my $answer=&sub_sql_reply($cmd);
+ if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
return $answer;
}
-sub subsqlreply {
+sub sub_sql_reply {
my ($cmd)=@_;
my $unixsock="mysqlsock";
my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
@@ -287,7 +4103,7 @@ sub ishome {
# ======================================================= Continue main program
# ---------------------------------------------------- Fork once and dissociate
-$fpid=fork;
+my $fpid=fork;
exit if $fpid;
die "Couldn't fork: $!" unless defined ($fpid);
@@ -295,838 +4111,1248 @@ POSIX::setsid() or die "Can't start new
# ------------------------------------------------------- Write our PID on disk
-$execdir=$perlvar{'lonDaemons'};
+my $execdir=$perlvar{'lonDaemons'};
open (PIDSAVE,">$execdir/logs/lond.pid");
print PIDSAVE "$$\n";
close(PIDSAVE);
-&logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
+&logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
+&status('Starting');
+
-# ------------------------------------------------------- Now we are on our own
-
-# Fork off our children.
-for (1 .. $PREFORK) {
- make_new_child();
-}
# ----------------------------------------------------- Install signal handlers
+
$SIG{CHLD} = \&REAPER;
$SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
$SIG{HUP} = \&HUPSMAN;
+$SIG{USR1} = \&checkchildren;
+$SIG{USR2} = \&UpdateHosts;
+
+# Read the host hashes:
+
+ReadHostTable;
+
+# --------------------------------------------------------------
+# Accept connections. When a connection comes in, it is validated
+# and if good, a child process is created to process transactions
+# along the connection.
-# And maintain the population.
while (1) {
- sleep; # wait for a signal (i.e., child's death)
- for ($i = $children; $i < $PREFORK; $i++) {
- make_new_child(); # top up the child pool
- }
+ &status('Starting accept');
+ $client = $server->accept() or next;
+ &status('Accepted '.$client.' off to spawn');
+ make_new_child($client);
+ &status('Finished spawning');
}
sub make_new_child {
my $pid;
- my $cipher;
+# my $cipher; # Now global
my $sigset;
- &logthis("Attempting to start child");
+
+ $client = shift;
+ &status('Starting new child '.$client);
+ &logthis('<font color="green"> Attempting to start child ('.$client.
+ ")</font>");
# block signal for fork
$sigset = POSIX::SigSet->new(SIGINT);
sigprocmask(SIG_BLOCK, $sigset)
or die "Can't block SIGINT for fork: $!\n";
-
+
die "fork: $!" unless defined ($pid = fork);
+
+ $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
+ # connection liveness.
+
+ #
+ # Figure out who we're talking to so we can record the peer in
+ # the pid hash.
+ #
+ my $caller = getpeername($client);
+ my ($port,$iaddr);
+ 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) {
# Parent records the child's birth and returns.
sigprocmask(SIG_UNBLOCK, $sigset)
or die "Can't unblock SIGINT for fork: $!\n";
- $children{$pid} = 1;
- $children++;
+ $children{$pid} = $clientip;
+ &status('Started child '.$pid);
return;
} else {
# Child can *not* return from this subroutine.
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
-
+ $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
+ #don't get intercepted
+ $SIG{USR1}= \&logstatus;
+ $SIG{ALRM}= \&timeout;
+ $lastlog='Forked ';
+ $status='Forked';
+
# unblock signals
sigprocmask(SIG_UNBLOCK, $sigset)
or die "Can't unblock SIGINT for fork: $!\n";
- $tmpsnum=0;
-
- # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
- for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
- $client = $server->accept() or last;
+# my $tmpsnum=0; # Now global
+#---------------------------------------------------- kerberos 5 initialization
+ &Authen::Krb5::init_context();
+ &Authen::Krb5::init_ets();
+ &status('Accepted connection');
# =============================================================================
# do something with the connection
# -----------------------------------------------------------------------------
- # see if we know client and check for spoof IP by challenge
- my $caller=getpeername($client);
- my ($port,$iaddr)=unpack_sockaddr_in($caller);
- my $clientip=inet_ntoa($iaddr);
- my $clientrec=($hostid{$clientip} ne undef);
- &logthis(
-"<font color=yellow>INFO: Connect from $clientip ($hostid{$clientip})</font>");
- my $clientok;
- if ($clientrec) {
- my $remotereq=<$client>;
- $remotereq=~s/\W//g;
- if ($remotereq eq 'init') {
- my $challenge="$$".time;
- print $client "$challenge\n";
- $remotereq=<$client>;
- $remotereq=~s/\W//g;
- if ($challenge eq $remotereq) {
- $clientok=1;
- print $client "ok\n";
- } else {
- &logthis(
- "<font color=blue>WARNING: $clientip did not reply challenge</font>");
- print $client "bye\n";
- }
- } else {
- &logthis(
- "<font color=blue>WARNING: "
- ."$clientip failed to initialize: >$remotereq< </font>");
- print $client "bye\n";
- }
- } else {
- &logthis(
- "<font color=blue>WARNING: Unknown client $clientip</font>");
- print $client "bye\n";
- }
- if ($clientok) {
+ # see if we know client and 'check' for spoof IP by ineffective challenge
+
+ ReadManagerTable; # May also be a manager!!
+
+ my $clientrec=($hostid{$clientip} ne undef);
+ my $ismanager=($managers{$clientip} ne undef);
+ $clientname = "[unknonwn]";
+ if($clientrec) { # Establish client type.
+ $ConnectionType = "client";
+ $clientname = $hostid{$clientip};
+ if($ismanager) {
+ $ConnectionType = "both";
+ }
+ } else {
+ $ConnectionType = "manager";
+ $clientname = $managers{$clientip};
+ }
+ my $clientok;
+
+ if ($clientrec || $ismanager) {
+ &status("Waiting for init from $clientip $clientname");
+ &logthis('<font color="yellow">INFO: Connection, '.
+ $clientip.
+ " ($clientname) connection type = $ConnectionType </font>" );
+ &status("Connecting $clientip ($clientname))");
+ my $remotereq=<$client>;
+ chomp($remotereq);
+ Debug("Got init: $remotereq");
+ my $inikeyword = split(/:/, $remotereq);
+ if ($remotereq =~ /^init/) {
+ &sethost("sethost:$perlvar{'lonHostID'}");
+ #
+ # If the remote is attempting a local init... give that a try:
+ #
+ my ($i, $inittype) = split(/:/, $remotereq);
+
+ # If the connection type is ssl, but I didn't get my
+ # certificate files yet, then I'll drop back to
+ # 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 {
+ my $ok = InsecureConnection($client);
+ 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 {
+ &logthis(
+ "<font color='blue'>WARNING: "
+ ."$clientip failed to initialize: >$remotereq< </font>");
+ &status('No init '.$clientip);
+ }
+
+ } else {
+ &logthis(
+ "<font color='blue'>WARNING: Unknown client $clientip</font>");
+ &status('Hung up on '.$clientip);
+ }
+
+ if ($clientok) {
# ---------------- New known client connecting, could mean machine online again
- &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
- &logthis(
- "<font color=green>Established connection: $hostid{$clientip}</font>");
+
+ foreach my $id (keys(%hostip)) {
+ if ($hostip{$id} ne $clientip ||
+ $hostip{$currenthostid} eq $clientip) {
+ # no need to try to do recon's to myself
+ next;
+ }
+ &reconlonc("$perlvar{'lonSockDir'}/$id");
+ }
+ &logthis("<font color='green'>Established connection: $clientname</font>");
+ &status('Will listen to '.$clientname);
# ------------------------------------------------------------ Process requests
- while (my $userinput=<$client>) {
- chomp($userinput);
- my $wasenc=0;
-# ------------------------------------------------------------ See if encrypted
- if ($userinput =~ /^enc/) {
- if ($cipher) {
- my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
- $userinput='';
- for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
- $userinput.=
- $cipher->decrypt(
- pack("H16",substr($encinput,$encidx,16))
- );
+ my $keep_going = 1;
+ my $user_input;
+ while(($user_input = get_request) && $keep_going) {
+ alarm(120);
+ Debug("Main: Got $user_input\n");
+ $keep_going = &process_request($user_input);
+ alarm(0);
+ &status('Listening to '.$clientname." ($keymode)");
+ }
+
+# --------------------------------------------- client unknown or fishy, refuse
+ } else {
+ print $client "refused\n";
+ $client->close();
+ &logthis("<font color='blue'>WARNING: "
+ ."Rejected client $clientip, closing connection</font>");
+ }
+ }
+
+# =============================================================================
+
+ &logthis("<font color='red'>CRITICAL: "
+ ."Disconnect from $clientip ($clientname)</font>");
+
+
+ # this exit is VERY important, otherwise the child will become
+ # a producer of more and more children, forking yourself into
+ # process death.
+ exit;
+
+}
+
+
+#
+# Checks to see if the input roleput request was to set
+# an author role. If so, invokes the lchtmldir script to set
+# up a correct public_html
+# Parameters:
+# request - The request sent to the rolesput subchunk.
+# We're looking for /domain/_au
+# domain - The domain in which the user is having roles doctored.
+# user - Name of the user for which the role is being put.
+# authtype - The authentication type associated with the user.
+#
+sub manage_permissions
+{
+
+ my ($request, $domain, $user, $authtype) = @_;
+
+ # See if the request is of the form /$domain/_au
+ if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
+ my $execdir = $perlvar{'lonDaemons'};
+ my $userhome= "/home/$user" ;
+ &logthis("system $execdir/lchtmldir $userhome $user $authtype");
+ system("$execdir/lchtmldir $userhome $user $authtype");
+ }
+}
+
+
+#
+# Return the full path of a user password file, whether it exists or not.
+# Parameters:
+# domain - Domain in which the password file lives.
+# user - name of the user.
+# Returns:
+# Full passwd path:
+#
+sub password_path {
+ my ($domain, $user) = @_;
+
+
+ my $path = &propath($domain, $user);
+ $path .= "/passwd";
+
+ return $path;
+}
+
+# Password Filename
+# Returns the path to a passwd file given domain and user... only if
+# it exists.
+# Parameters:
+# domain - Domain in which to search.
+# user - username.
+# Returns:
+# - If the password file exists returns its path.
+# - If the password file does not exist, returns undefined.
+#
+sub password_filename {
+ my ($domain, $user) = @_;
+
+ Debug ("PasswordFilename called: dom = $domain user = $user");
+
+ my $path = &password_path($domain, $user);
+ Debug("PasswordFilename got path: $path");
+ if(-e $path) {
+ return $path;
+ } else {
+ return undef;
+ }
+}
+
+#
+# Rewrite the contents of the user's passwd file.
+# Parameters:
+# domain - domain of the user.
+# name - User's name.
+# contents - New contents of the file.
+# Returns:
+# 0 - Failed.
+# 1 - Success.
+#
+sub rewrite_password_file {
+ my ($domain, $user, $contents) = @_;
+
+ my $file = &password_filename($domain, $user);
+ if (defined $file) {
+ my $pf = IO::File->new(">$file");
+ if($pf) {
+ print $pf "$contents\n";
+ return 1;
+ } else {
+ return 0;
+ }
+ } else {
+ return 0;
+ }
+
+}
+
+#
+# get_auth_type - Determines the authorization type of a user in a domain.
+
+# Returns the authorization type or nouser if there is no such user.
+#
+sub get_auth_type
+{
+
+ my ($domain, $user) = @_;
+
+ Debug("get_auth_type( $domain, $user ) \n");
+ my $proname = &propath($domain, $user);
+ my $passwdfile = "$proname/passwd";
+ if( -e $passwdfile ) {
+ my $pf = IO::File->new($passwdfile);
+ my $realpassword = <$pf>;
+ chomp($realpassword);
+ Debug("Password info = $realpassword\n");
+ my ($authtype, $contentpwd) = split(/:/, $realpassword);
+ 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");
+ return "nouser";
+ }
+}
+
+#
+# Validate a user given their domain, name and password. This utility
+# function is used by both AuthenticateHandler and ChangePasswordHandler
+# to validate the login credentials of a user.
+# Parameters:
+# $domain - The domain being logged into (this is required due to
+# the capability for multihomed systems.
+# $user - The name of the user being validated.
+# $password - The user's propoposed password.
+#
+# Returns:
+# 1 - The domain,user,pasword triplet corresponds to a valid
+# user.
+# 0 - The domain,user,password triplet is not a valid user.
+#
+sub validate_user {
+ my ($domain, $user, $password) = @_;
+
+
+ # Why negative ~pi you may well ask? Well this function is about
+ # authentication, and therefore very important to get right.
+ # I've initialized the flag that determines whether or not I've
+ # validated correctly to a value it's not supposed to get.
+ # At the end of this function. I'll ensure that it's not still that
+ # value so we don't just wind up returning some accidental value
+ # as a result of executing an unforseen code path that
+ # did not set $validated.
+
+ my $validated = -3.14159;
+
+ # How we authenticate is determined by the type of authentication
+ # the user has been assigned. If the authentication type is
+ # "nouser", the user does not exist so we will return 0.
+
+ my $contents = &get_auth_type($domain, $user);
+ my ($howpwd, $contentpwd) = split(/:/, $contents);
+
+ my $null = pack("C",0); # Used by kerberos auth types.
+
+ if ($howpwd ne 'nouser') {
+
+ if($howpwd eq "internal") { # Encrypted is in local password file.
+ $validated = (crypt($password, $contentpwd) eq $contentpwd);
+ }
+ elsif ($howpwd eq "unix") { # User is a normal unix user.
+ $contentpwd = (getpwnam($user))[1];
+ if($contentpwd) {
+ if($contentpwd eq 'x') { # Shadow password file...
+ my $pwauth_path = "/usr/local/sbin/pwauth";
+ open PWAUTH, "|$pwauth_path" or
+ die "Cannot invoke authentication";
+ print PWAUTH "$user\n$password\n";
+ close PWAUTH;
+ $validated = ! $?;
+
+ } else { # Passwords in /etc/passwd.
+ $validated = (crypt($password,
+ $contentpwd) eq $contentpwd);
+ }
+ } else {
+ $validated = 0;
+ }
+ }
+ elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
+ if(! ($password =~ /$null/) ) {
+ my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
+ "",
+ $contentpwd,,
+ 'krbtgt',
+ $contentpwd,
+ 1,
+ $password);
+ if(!$k4error) {
+ $validated = 1;
+ } else {
+ $validated = 0;
+ &logthis('krb4: '.$user.', '.$contentpwd.', '.
+ &Authen::Krb4::get_err_txt($Authen::Krb4::error));
+ }
+ } else {
+ $validated = 0; # Password has a match with null.
+ }
+ } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
+ if(!($password =~ /$null/)) { # Null password not allowed.
+ my $krbclient = &Authen::Krb5::parse_name($user.'@'
+ .$contentpwd);
+ my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
+ my $krbserver = &Authen::Krb5::parse_name($krbservice);
+ my $credentials= &Authen::Krb5::cc_default();
+ $credentials->initialize($krbclient);
+ my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient,
+ $krbserver,
+ $password,
+ $credentials);
+ $validated = ($krbreturn == 1);
+ } else {
+ $validated = 0;
+ }
+ } elsif ($howpwd eq "localauth") {
+ # Authenticate via installation specific authentcation method:
+ $validated = &localauth::localauth($user,
+ $password,
+ $contentpwd);
+ } else { # Unrecognized auth is also bad.
+ $validated = 0;
+ }
+ } else {
+ $validated = 0;
+ }
+ #
+ # $validated has the correct stat of the authentication:
+ #
+
+ unless ($validated != -3.14159) {
+ die "ValidateUser - failed to set the value of validated";
+ }
+ return $validated;
+}
+
+
+sub addline {
+ my ($fname,$hostid,$ip,$newline)=@_;
+ my $contents;
+ my $found=0;
+ my $expr='^'.$hostid.':'.$ip.':';
+ $expr =~ s/\./\\\./g;
+ my $sh;
+ if ($sh=IO::File->new("$fname.subscription")) {
+ while (my $subline=<$sh>) {
+ if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
+ }
+ $sh->close();
+ }
+ $sh=IO::File->new(">$fname.subscription");
+ if ($contents) { print $sh $contents; }
+ if ($newline) { print $sh $newline; }
+ $sh->close();
+ return $found;
+}
+
+sub get_chat {
+ my ($cdom,$cname,$udom,$uname)=@_;
+ my %hash;
+ my $proname=&propath($cdom,$cname);
+ my @entries=();
+ if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
+ &GDBM_READER(),0640)) {
+ @entries=map { $_.':'.$hash{$_} } sort keys %hash;
+ untie %hash;
+ }
+ my @participants=();
+ my $cutoff=time-60;
+ if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
+ &GDBM_WRCREAT(),0640)) {
+ $hash{$uname.':'.$udom}=time;
+ foreach (sort keys %hash) {
+ if ($hash{$_}>$cutoff) {
+ $participants[$#participants+1]='active_participant:'.$_;
+ }
+ }
+ untie %hash;
+ }
+ return (@participants,@entries);
+}
+
+sub chat_add {
+ my ($cdom,$cname,$newchat)=@_;
+ my %hash;
+ my $proname=&propath($cdom,$cname);
+ my @entries=();
+ my $time=time;
+ if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
+ &GDBM_WRCREAT(),0640)) {
+ @entries=map { $_.':'.$hash{$_} } sort keys %hash;
+ my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
+ my ($thentime,$idnum)=split(/\_/,$lastid);
+ my $newid=$time.'_000000';
+ if ($thentime==$time) {
+ $idnum=~s/^0+//;
+ $idnum++;
+ $idnum=substr('000000'.$idnum,-6,6);
+ $newid=$time.'_'.$idnum;
+ }
+ $hash{$newid}=$newchat;
+ my $expired=$time-3600;
+ foreach (keys %hash) {
+ my ($thistime)=($_=~/(\d+)\_/);
+ if ($thistime<$expired) {
+ delete $hash{$_};
+ }
+ }
+ untie %hash;
+ }
+ {
+ my $hfh;
+ if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
+ print $hfh "$time:".&unescape($newchat)."\n";
+ }
+ }
+}
+
+sub unsub {
+ my ($fname,$clientip)=@_;
+ 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")) {
+ $unsubs++; # Successful unsub via marker file.
+ }
+
+ # The more modern way to do it is to have a subscription list
+ # file:
+
+ if (-e "$fname.subscription") {
+ my $found=&addline($fname,$clientname,$clientip,'');
+ 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 {
+ $result = "not_subscribed\n";
+ }
+
+ return $result;
+}
+
+sub currentversion {
+ my $fname=shift;
+ my $version=-1;
+ my $ulsdir='';
+ if ($fname=~/^(.+)\/[^\/]+$/) {
+ $ulsdir=$1;
+ }
+ my ($fnamere1,$fnamere2);
+ # remove version if already specified
+ $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
+ # get the bits that go before and after the version number
+ if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
+ $fnamere1=$1;
+ $fnamere2='.'.$2;
+ }
+ if (-e $fname) { $version=1; }
+ if (-e $ulsdir) {
+ if(-d $ulsdir) {
+ if (opendir(LSDIR,$ulsdir)) {
+ my $ulsfn;
+ while ($ulsfn=readdir(LSDIR)) {
+# see if this is a regular file (ignore links produced earlier)
+ my $thisfile=$ulsdir.'/'.$ulsfn;
+ unless (-l $thisfile) {
+ if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
+ if ($1>$version) { $version=$1; }
+ }
}
- $userinput=substr($userinput,0,$cmdlength);
- $wasenc=1;
- }
- }
-# ------------------------------------------------------------- Normal commands
-# ------------------------------------------------------------------------ ping
- if ($userinput =~ /^ping/) {
- print $client "$perlvar{'lonHostID'}\n";
-# ------------------------------------------------------------------------ pong
- } elsif ($userinput =~ /^pong/) {
- $reply=reply("ping",$hostid{$clientip});
- print $client "$perlvar{'lonHostID'}:$reply\n";
-# ------------------------------------------------------------------------ ekey
- } elsif ($userinput =~ /^ekey/) {
- my $buildkey=time.$$.int(rand 100000);
- $buildkey=~tr/1-6/A-F/;
- $buildkey=int(rand 100000).$buildkey.int(rand 100000);
- my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
- $key=~tr/a-z/A-Z/;
- $key=~tr/G-P/0-9/;
- $key=~tr/Q-Z/0-9/;
- $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
- $key=substr($key,0,32);
- my $cipherkey=pack("H32",$key);
- $cipher=new IDEA $cipherkey;
- print $client "$buildkey\n";
-# ------------------------------------------------------------------------ load
- } elsif ($userinput =~ /^load/) {
- my $loadavg;
- {
- my $loadfile=IO::File->new('/proc/loadavg');
- $loadavg=<$loadfile>;
- }
- $loadavg =~ s/\s.*//g;
- my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
- print $client "$loadpercent\n";
-# ------------------------------------------------------------------------ auth
- } elsif ($userinput =~ /^auth/) {
- if ($wasenc==1) {
- my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
- chomp($upass);
- $upass=unescape($upass);
- my $proname=propath($udom,$uname);
- my $passfilename="$proname/passwd";
- if (-e $passfilename) {
- my $pf = IO::File->new($passfilename);
- my $realpasswd=<$pf>;
- chomp($realpasswd);
- my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
- my $pwdcorrect=0;
- if ($howpwd eq 'internal') {
- $pwdcorrect=
- (crypt($upass,$contentpwd) eq $contentpwd);
- } elsif ($howpwd eq 'unix') {
- $contentpwd=(getpwnam($uname))[1];
- $pwdcorrect=
- (crypt($upass,$contentpwd) eq $contentpwd);
- } elsif ($howpwd eq 'krb4') {
- $pwdcorrect=(
- Authen::Krb4::get_pw_in_tkt($uname,"",
- $contentpwd,'krbtgt',$contentpwd,1,
- $upass) == 0);
- }
- if ($pwdcorrect) {
- print $client "authorized\n";
- } else {
- print $client "non_authorized\n";
- }
- } else {
- print $client "unknown_user\n";
- }
- } else {
- print $client "refused\n";
- }
-# ---------------------------------------------------------------------- passwd
- } elsif ($userinput =~ /^passwd/) {
- if ($wasenc==1) {
- my
- ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
- chomp($npass);
- $upass=&unescape($upass);
- $npass=&unescape($npass);
- my $proname=propath($udom,$uname);
- my $passfilename="$proname/passwd";
- if (-e $passfilename) {
- my $realpasswd;
- { my $pf = IO::File->new($passfilename);
- $realpasswd=<$pf>; }
- chomp($realpasswd);
- my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
- if ($howpwd eq 'internal') {
- if (crypt($upass,$contentpwd) eq $contentpwd) {
- my $salt=time;
- $salt=substr($salt,6,2);
- my $ncpass=crypt($npass,$salt);
- { my $pf = IO::File->new(">$passfilename");
- print $pf "internal:$ncpass\n"; }
- print $client "ok\n";
- } else {
- print $client "non_authorized\n";
- }
- } else {
- print $client "auth_mode_error\n";
- }
- } else {
- print $client "unknown_user\n";
- }
- } else {
- print $client "refused\n";
- }
-# -------------------------------------------------------------------- makeuser
- } elsif ($userinput =~ /^makeuser/) {
- if ($wasenc==1) {
- my
- ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
- chomp($npass);
- $npass=&unescape($npass);
- my $proname=propath($udom,$uname);
- my $passfilename="$proname/passwd";
- if (-e $passfilename) {
- print $client "already_exists\n";
- } elsif ($udom ne $perlvar{'lonDefDomain'}) {
- print $client "not_right_domain\n";
- } else {
- @fpparts=split(/\//,$proname);
- $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
- $fperror='';
- for ($i=3;$i<=$#fpparts;$i++) {
- $fpnow.='/'.$fpparts[$i];
- unless (-e $fpnow) {
- unless (mkdir($fpnow,0777)) {
- $fperror="error:$!\n";
- }
- }
- }
- unless ($fperror) {
- if ($umode eq 'krb4') {
- {
- my $pf = IO::File->new(">$passfilename");
- print $pf "krb4:$npass\n";
- }
- print $client "ok\n";
- } elsif ($umode eq 'internal') {
- my $salt=time;
- $salt=substr($salt,6,2);
- my $ncpass=crypt($npass,$salt);
- {
- my $pf = IO::File->new(">$passfilename");
- print $pf "internal:$ncpass\n";
- }
- print $client "ok\n";
- } elsif ($umode eq 'none') {
- {
- my $pf = IO::File->new(">$passfilename");
- print $pf "none:\n";
- }
- print $client "ok\n";
- } else {
- print $client "auth_mode_error\n";
- }
- } else {
- print $client "$fperror\n";
- }
- }
- } else {
- print $client "refused\n";
- }
-# ------------------------------------------------------------------------ home
- } elsif ($userinput =~ /^home/) {
- my ($cmd,$udom,$uname)=split(/:/,$userinput);
- chomp($uname);
- my $proname=propath($udom,$uname);
- if (-e $proname) {
- print $client "found\n";
- } else {
- print $client "not_found\n";
- }
-# ---------------------------------------------------------------------- update
- } elsif ($userinput =~ /^update/) {
- my ($cmd,$fname)=split(/:/,$userinput);
- my $ownership=ishome($fname);
- if ($ownership eq 'not_owner') {
- if (-e $fname) {
- my ($dev,$ino,$mode,$nlink,
- $uid,$gid,$rdev,$size,
- $atime,$mtime,$ctime,
- $blksize,$blocks)=stat($fname);
- $now=time;
- $since=$now-$atime;
- if ($since>$perlvar{'lonExpire'}) {
- $reply=
- reply("unsub:$fname","$hostid{$clientip}");
- unlink("$fname");
- } else {
- my $transname="$fname.in.transfer";
- my $remoteurl=
- reply("sub:$fname","$hostid{$clientip}");
- my $response;
- {
- my $ua=new LWP::UserAgent;
- my $request=new HTTP::Request('GET',"$remoteurl");
- $response=$ua->request($request,$transname);
- }
- if ($response->is_error()) {
- unlink($transname);
- my $message=$response->status_line;
- &logthis(
- "LWP GET: $message for $fname ($remoteurl)");
- } else {
- if ($remoteurl!~/\.meta$/) {
- my $ua=new LWP::UserAgent;
- my $mrequest=
- new HTTP::Request('GET',$remoteurl.'.meta');
- my $mresponse=
- $ua->request($mrequest,$fname.'.meta');
- if ($mresponse->is_error()) {
- unlink($fname.'.meta');
- }
- }
- rename($transname,$fname);
- }
- }
- print $client "ok\n";
- } else {
- print $client "not_found\n";
- }
- } else {
- print $client "rejected\n";
- }
-# ----------------------------------------------------------------- unsubscribe
- } elsif ($userinput =~ /^unsub/) {
- my ($cmd,$fname)=split(/:/,$userinput);
- if (-e $fname) {
- if (unlink("$fname.$hostid{$clientip}")) {
- print $client "ok\n";
- } else {
- print $client "not_subscribed\n";
- }
- } else {
- print $client "not_found\n";
- }
-# ------------------------------------------------------------------- subscribe
- } elsif ($userinput =~ /^sub/) {
- my ($cmd,$fname)=split(/:/,$userinput);
- my $ownership=ishome($fname);
- if ($ownership eq 'owner') {
- if (-e $fname) {
- if (-d $fname) {
- print $client "directory\n";
- } else {
- $now=time;
- {
- my $sh;
- if ($sh=
- IO::File->new(">$fname.$hostid{$clientip}")) {
- print $sh "$clientip:$now\n";
- }
- }
- unless ($fname=~/\.meta$/) {
- unlink("$fname.meta.$hostid{$clientip}");
- }
- $fname=~s/\/home\/httpd\/html\/res/raw/;
- $fname="http://$thisserver/".$fname;
- print $client "$fname\n";
- }
- } else {
- print $client "not_found\n";
- }
- } else {
- print $client "rejected\n";
- }
-# ------------------------------------------------------------------------- log
- } elsif ($userinput =~ /^log/) {
- my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
- chomp($what);
- my $proname=propath($udom,$uname);
- my $now=time;
- {
- my $hfh;
- if ($hfh=IO::File->new(">>$proname/activity.log")) {
- print $hfh "$now:$hostid{$clientip}:$what\n";
- print $client "ok\n";
- } else {
- print $client "error:$!\n";
- }
- }
-# ------------------------------------------------------------------------- put
- } elsif ($userinput =~ /^put/) {
- my ($cmd,$udom,$uname,$namespace,$what)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- if ($namespace ne 'roles') {
- chomp($what);
- my $proname=propath($udom,$uname);
- my $now=time;
- {
- my $hfh;
- if (
- $hfh=IO::File->new(">>$proname/$namespace.hist")
- ) { print $hfh "P:$now:$what\n"; }
- }
- my @pairs=split(/\&/,$what);
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
- foreach $pair (@pairs) {
- ($key,$value)=split(/=/,$pair);
- $hash{$key}=$value;
- }
- if (untie(%hash)) {
- print $client "ok\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "refused\n";
- }
-# -------------------------------------------------------------------- rolesput
- } elsif ($userinput =~ /^rolesput/) {
- if ($wasenc==1) {
- my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
- =split(/:/,$userinput);
- my $namespace='roles';
- chomp($what);
- my $proname=propath($udom,$uname);
- my $now=time;
- {
- my $hfh;
- if (
- $hfh=IO::File->new(">>$proname/$namespace.hist")
- ) {
- print $hfh "P:$now:$exedom:$exeuser:$what\n";
- }
- }
- my @pairs=split(/\&/,$what);
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
- foreach $pair (@pairs) {
- ($key,$value)=split(/=/,$pair);
- $hash{$key}=$value;
- }
- if (untie(%hash)) {
- print $client "ok\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "refused\n";
- }
-# ------------------------------------------------------------------------- get
- } elsif ($userinput =~ /^get/) {
- my ($cmd,$udom,$uname,$namespace,$what)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- chomp($what);
- my @queries=split(/\&/,$what);
- my $proname=propath($udom,$uname);
- my $qresult='';
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
- for ($i=0;$i<=$#queries;$i++) {
- $qresult.="$hash{$queries[$i]}&";
- }
- if (untie(%hash)) {
- $qresult=~s/\&$//;
- print $client "$qresult\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ------------------------------------------------------------------------ eget
- } elsif ($userinput =~ /^eget/) {
- my ($cmd,$udom,$uname,$namespace,$what)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- chomp($what);
- my @queries=split(/\&/,$what);
- my $proname=propath($udom,$uname);
- my $qresult='';
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
- for ($i=0;$i<=$#queries;$i++) {
- $qresult.="$hash{$queries[$i]}&";
- }
- if (untie(%hash)) {
- $qresult=~s/\&$//;
- if ($cipher) {
- my $cmdlength=length($qresult);
- $qresult.=" ";
- my $encqresult='';
- for
- (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
- $encqresult.=
- unpack("H16",
- $cipher->encrypt(substr($qresult,$encidx,8)));
- }
- print $client "enc:$cmdlength:$encqresult\n";
- } else {
- print $client "error:no_key\n";
- }
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ------------------------------------------------------------------------- del
- } elsif ($userinput =~ /^del/) {
- my ($cmd,$udom,$uname,$namespace,$what)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- chomp($what);
- my $proname=propath($udom,$uname);
- my $now=time;
- {
- my $hfh;
- if (
- $hfh=IO::File->new(">>$proname/$namespace.hist")
- ) { print $hfh "D:$now:$what\n"; }
- }
- my @keys=split(/\&/,$what);
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
- foreach $key (@keys) {
- delete($hash{$key});
- }
- if (untie(%hash)) {
- print $client "ok\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ------------------------------------------------------------------------ keys
- } elsif ($userinput =~ /^keys/) {
- my ($cmd,$udom,$uname,$namespace)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- my $proname=propath($udom,$uname);
- my $qresult='';
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
- foreach $key (keys %hash) {
- $qresult.="$key&";
- }
- if (untie(%hash)) {
- $qresult=~s/\&$//;
- print $client "$qresult\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ------------------------------------------------------------------------ dump
- } elsif ($userinput =~ /^dump/) {
- my ($cmd,$udom,$uname,$namespace)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- my $proname=propath($udom,$uname);
- my $qresult='';
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
- foreach $key (keys %hash) {
- $qresult.="$key=$hash{$key}&";
- }
- if (untie(%hash)) {
- $qresult=~s/\&$//;
- print $client "$qresult\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ----------------------------------------------------------------------- store
- } elsif ($userinput =~ /^store/) {
- my ($cmd,$udom,$uname,$namespace,$rid,$what)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- if ($namespace ne 'roles') {
- chomp($what);
- my $proname=propath($udom,$uname);
- my $now=time;
- {
- my $hfh;
- if (
- $hfh=IO::File->new(">>$proname/$namespace.hist")
- ) { print $hfh "P:$now:$rid:$what\n"; }
- }
- my @pairs=split(/\&/,$what);
-
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
- my @previouskeys=split(/&/,$hash{"keys:$rid"});
- my $key;
- $hash{"version:$rid"}++;
- my $version=$hash{"version:$rid"};
- my $allkeys='';
- foreach $pair (@pairs) {
- ($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 $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "refused\n";
- }
-# --------------------------------------------------------------------- restore
- } elsif ($userinput =~ /^restore/) {
- my ($cmd,$udom,$uname,$namespace,$rid)
- =split(/:/,$userinput);
- $namespace=~s/\//\_/g;
- $namespace=~s/\W//g;
- chomp($rid);
- my $proname=propath($udom,$uname);
- my $qresult='';
- if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
- my $version=$hash{"version:$rid"};
- $qresult.="version=$version&";
- my $scope;
- for ($scope=1;$scope<=$version;$scope++) {
- my $vkeys=$hash{"$scope:keys:$rid"};
- my @keys=split(/:/,$vkeys);
- my $key;
- $qresult.="$scope:keys=$vkeys&";
- foreach $key (@keys) {
- $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
- }
- }
- if (untie(%hash)) {
- $qresult=~s/\&$//;
- print $client "$qresult\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ------------------------------------------------------------------- querysend
- } elsif ($userinput =~ /^querysend/) {
- my ($cmd,$query,
- $custom,$customshow)=split(/:/,$userinput);
- $query=~s/\n*$//g;
- unless ($custom or $customshow) {
- print $client "".
- sqlreply("$hostid{$clientip}\&$query")."\n";
- }
- else {
- print $client "".
- sqlreply("$hostid{$clientip}\&$query".
- "\&$custom"."\&$customshow")."\n";
- }
-# ------------------------------------------------------------------ queryreply
- } elsif ($userinput =~ /^queryreply/) {
- my ($cmd,$id,$reply)=split(/:/,$userinput);
- my $store;
- my $execdir=$perlvar{'lonDaemons'};
- if ($store=IO::File->new(">$execdir/tmp/$id")) {
- $reply=~s/\&/\n/g;
- print $store $reply;
- close $store;
- my $store2=IO::File->new(">$execdir/tmp/$id.end");
- print $store2 "done\n";
- close $store2;
- print $client "ok\n";
- }
- else {
- print $client "error:$!\n";
- }
-# ----------------------------------------------------------------------- idput
- } elsif ($userinput =~ /^idput/) {
- my ($cmd,$udom,$what)=split(/:/,$userinput);
- chomp($what);
- $udom=~s/\W//g;
- my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
- my $now=time;
- {
- my $hfh;
- if (
- $hfh=IO::File->new(">>$proname.hist")
- ) { print $hfh "P:$now:$what\n"; }
- }
- my @pairs=split(/\&/,$what);
- if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
- foreach $pair (@pairs) {
- ($key,$value)=split(/=/,$pair);
- $hash{$key}=$value;
- }
- if (untie(%hash)) {
- print $client "ok\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ----------------------------------------------------------------------- idget
- } elsif ($userinput =~ /^idget/) {
- my ($cmd,$udom,$what)=split(/:/,$userinput);
- chomp($what);
- $udom=~s/\W//g;
- my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
- my @queries=split(/\&/,$what);
- my $qresult='';
- if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
- for ($i=0;$i<=$#queries;$i++) {
- $qresult.="$hash{$queries[$i]}&";
- }
- if (untie(%hash)) {
- $qresult=~s/\&$//;
- print $client "$qresult\n";
- } else {
- print $client "error:$!\n";
- }
- } else {
- print $client "error:$!\n";
- }
-# ---------------------------------------------------------------------- tmpput
- } elsif ($userinput =~ /^tmpput/) {
- my ($cmd,$what)=split(/:/,$userinput);
- my $store;
- $tmpsnum++;
- my $id=$$.'_'.$clientip.'_'.$tmpsnum;
- $id=~s/\W/\_/g;
- $what=~s/\n//g;
- my $execdir=$perlvar{'lonDaemons'};
- if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
- print $store $what;
- close $store;
- print $client "$id\n";
- }
- else {
- print $client "error:$!\n";
- }
+ }
+ closedir(LSDIR);
+ $version++;
+ }
+ }
+ }
+ return $version;
+}
-# ---------------------------------------------------------------------- tmpget
- } elsif ($userinput =~ /^tmpget/) {
- my ($cmd,$id)=split(/:/,$userinput);
- chomp($id);
- $id=~s/\W/\_/g;
- my $store;
- my $execdir=$perlvar{'lonDaemons'};
- if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
- my $reply=<$store>;
- print $client "$reply\n";
- close $store;
- }
- else {
- print $client "error:$!\n";
- }
+sub thisversion {
+ my $fname=shift;
+ my $version=-1;
+ if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
+ $version=$1;
+ }
+ return $version;
+}
-# -------------------------------------------------------------------------- ls
- } elsif ($userinput =~ /^ls/) {
- my ($cmd,$ulsdir)=split(/:/,$userinput);
- my $ulsout='';
- my $ulsfn;
- if (-e $ulsdir) {
- if (opendir(LSDIR,$ulsdir)) {
- while ($ulsfn=readdir(LSDIR)) {
- my @ulsstats=stat($ulsdir.'/'.$ulsfn);
- $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
- }
- closedir(LSDIR);
- }
- } else {
- $ulsout='no_such_dir';
- }
- if ($ulsout eq '') { $ulsout='empty'; }
- print $client "$ulsout\n";
-# ------------------------------------------------------------- unknown command
- } else {
- # unknown command
- print $client "unknown_cmd\n";
- }
-# ------------------------------------------------------ client unknown, refuse
- }
- } else {
- print $client "refused\n";
- &logthis("<font color=blue>WARNING: "
- ."Rejected client $clientip, closing connection</font>");
- }
- &logthis("<font color=red>CRITICAL: "
- ."Disconnect from $clientip ($hostid{$clientip})</font>");
-# =============================================================================
+sub subscribe {
+ my ($userinput,$clientip)=@_;
+ my $result;
+ my ($cmd,$fname)=split(/:/,$userinput);
+ my $ownership=&ishome($fname);
+ if ($ownership eq 'owner') {
+# explitly asking for the current version?
+ unless (-e $fname) {
+ my $currentversion=¤tversion($fname);
+ if (&thisversion($fname)==$currentversion) {
+ if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
+ my $root=$1;
+ my $extension=$2;
+ symlink($root.'.'.$extension,
+ $root.'.'.$currentversion.'.'.$extension);
+ unless ($extension=~/\.meta$/) {
+ symlink($root.'.'.$extension.'.meta',
+ $root.'.'.$currentversion.'.'.$extension.'.meta');
+ }
+ }
+ }
}
-
- # tidy up gracefully and finish
-
- # this exit is VERY important, otherwise the child will become
- # a producer of more and more children, forking yourself into
- # process death.
- exit;
+ if (-e $fname) {
+ if (-d $fname) {
+ $result="directory\n";
+ } else {
+ if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
+ my $now=time;
+ my $found=&addline($fname,$clientname,$clientip,
+ "$clientname:$clientip:$now\n");
+ if ($found) { $result="$fname\n"; }
+ # if they were subscribed to only meta data, delete that
+ # subscription, when you subscribe to a file you also get
+ # the metadata
+ unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
+ $fname=~s/\/home\/httpd\/html\/res/raw/;
+ $fname="http://$thisserver/".$fname;
+ $result="$fname\n";
+ }
+ } else {
+ $result="not_found\n";
+ }
+ } else {
+ $result="rejected\n";
}
+ return $result;
}
+sub make_passwd_file {
+ my ($uname, $umode,$npass,$passfilename)=@_;
+ my $result="ok\n";
+ if ($umode eq 'krb4' or $umode eq 'krb5') {
+ {
+ my $pf = IO::File->new(">$passfilename");
+ print $pf "$umode:$npass\n";
+ }
+ } elsif ($umode eq 'internal') {
+ my $salt=time;
+ $salt=substr($salt,6,2);
+ my $ncpass=crypt($npass,$salt);
+ {
+ &Debug("Creating internal auth");
+ my $pf = IO::File->new(">$passfilename");
+ print $pf "internal:$ncpass\n";
+ }
+ } elsif ($umode eq 'localauth') {
+ {
+ my $pf = IO::File->new(">$passfilename");
+ print $pf "localauth:$npass\n";
+ }
+ } elsif ($umode eq 'unix') {
+ {
+ #
+ # Don't allow the creation of privileged accounts!!! that would
+ # be real bad!!!
+ #
+ my $uid = getpwnam($uname);
+ if((defined $uid) && ($uid == 0)) {
+ &logthis(">>>Attempted to create privilged account blocked");
+ return "no_priv_account_error\n";
+ }
+
+ my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
+
+ my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
+ {
+ &Debug("Executing external: ".$execpath);
+ &Debug("user = ".$uname.", Password =". $npass);
+ my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
+ print $se "$uname\n";
+ print $se "$npass\n";
+ print $se "$npass\n";
+ print $se "$lc_error_file\n"; # Status -> unique file.
+ }
+ my $error = IO::File->new("< $lc_error_file");
+ my $useraddok = <$error>;
+ $error->close;
+ unlink($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 $pf "unix:\n";
+ }
+ }
+ } elsif ($umode eq 'none') {
+ {
+ my $pf = IO::File->new("> $passfilename");
+ print $pf "none:\n";
+ }
+ } else {
+ $result="auth_mode_error\n";
+ }
+ return $result;
+}
+
+sub sethost {
+ my ($remotereq) = @_;
+ my (undef,$hostid)=split(/:/,$remotereq);
+ if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
+ if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
+ $currenthostid =$hostid;
+ $currentdomainid=$hostdom{$hostid};
+ &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
+ } else {
+ &logthis("Requested host id $hostid not an alias of ".
+ $perlvar{'lonHostID'}." refusing connection");
+ return 'unable_to_set';
+ }
+ return 'ok';
+}
+
+sub version {
+ my ($userinput)=@_;
+ $remoteVERSION=(split(/:/,$userinput))[1];
+ return "version:$VERSION";
+}
+
+#There is a copy of this in lonnet.pm
+sub userload {
+ my $numusers=0;
+ {
+ opendir(LONIDS,$perlvar{'lonIDsDir'});
+ my $filename;
+ my $curtime=time;
+ while ($filename=readdir(LONIDS)) {
+ if ($filename eq '.' || $filename eq '..') {next;}
+ my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
+ if ($curtime-$mtime < 1800) { $numusers++; }
+ }
+ closedir(LONIDS);
+ }
+ my $userloadpercent=0;
+ my $maxuserload=$perlvar{'lonUserLoadLim'};
+ if ($maxuserload) {
+ $userloadpercent=100*$numusers/$maxuserload;
+ }
+ $userloadpercent=sprintf("%.2f",$userloadpercent);
+ return $userloadpercent;
+}
+
+# Routines for serializing arrays and hashes (copies from lonnet)
+
+sub array2str {
+ my (@array) = @_;
+ my $result=&arrayref2str(\@array);
+ $result=~s/^__ARRAY_REF__//;
+ $result=~s/__END_ARRAY_REF__$//;
+ return $result;
+}
+
+sub arrayref2str {
+ my ($arrayref) = @_;
+ my $result='__ARRAY_REF__';
+ foreach my $elem (@$arrayref) {
+ if(ref($elem) eq 'ARRAY') {
+ $result.=&arrayref2str($elem).'&';
+ } elsif(ref($elem) eq 'HASH') {
+ $result.=&hashref2str($elem).'&';
+ } elsif(ref($elem)) {
+ #print("Got a ref of ".(ref($elem))." skipping.");
+ } else {
+ $result.=&escape($elem).'&';
+ }
+ }
+ $result=~s/\&$//;
+ $result .= '__END_ARRAY_REF__';
+ return $result;
+}
+
+sub hash2str {
+ my (%hash) = @_;
+ my $result=&hashref2str(\%hash);
+ $result=~s/^__HASH_REF__//;
+ $result=~s/__END_HASH_REF__$//;
+ return $result;
+}
+
+sub hashref2str {
+ my ($hashref)=@_;
+ my $result='__HASH_REF__';
+ foreach (sort(keys(%$hashref))) {
+ if (ref($_) eq 'ARRAY') {
+ $result.=&arrayref2str($_).'=';
+ } elsif (ref($_) eq 'HASH') {
+ $result.=&hashref2str($_).'=';
+ } elsif (ref($_)) {
+ $result.='=';
+ #print("Got a ref of ".(ref($_))." skipping.");
+ } else {
+ if ($_) {$result.=&escape($_).'=';} else { last; }
+ }
+
+ if(ref($hashref->{$_}) eq 'ARRAY') {
+ $result.=&arrayref2str($hashref->{$_}).'&';
+ } elsif(ref($hashref->{$_}) eq 'HASH') {
+ $result.=&hashref2str($hashref->{$_}).'&';
+ } elsif(ref($hashref->{$_})) {
+ $result.='&';
+ #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
+ } else {
+ $result.=&escape($hashref->{$_}).'&';
+ }
+ }
+ $result=~s/\&$//;
+ $result .= '__END_HASH_REF__';
+ return $result;
+}
+
+# ----------------------------------- POD (plain old documentation, CPAN style)
+
+=head1 NAME
+
+lond - "LON Daemon" Server (port "LOND" 5663)
+
+=head1 SYNOPSIS
+
+Usage: B<lond>
+
+Should only be run as user=www. This is a command-line script which
+is invoked by B<loncron>. There is no expectation that a typical user
+will manually start B<lond> from the command-line. (In other words,
+DO NOT START B<lond> YOURSELF.)
+
+=head1 DESCRIPTION
+
+There are two characteristics associated with the running of B<lond>,
+PROCESS MANAGEMENT (starting, stopping, handling child processes)
+and SERVER-SIDE ACTIVITIES (password authentication, user creation,
+subscriptions, etc). These are described in two large
+sections below.
+
+B<PROCESS MANAGEMENT>
+
+Preforker - server who forks first. Runs as a daemon. HUPs.
+Uses IDEA encryption
+
+B<lond> forks off children processes that correspond to the other servers
+in the network. Management of these processes can be done at the
+parent process level or the child process level.
+
+B<logs/lond.log> is the location of log messages.
+
+The process management is now explained in terms of linux shell commands,
+subroutines internal to this code, and signal assignments:
+
+=over 4
+
+=item *
+
+PID is stored in B<logs/lond.pid>
+
+This is the process id number of the parent B<lond> process.
+
+=item *
+
+SIGTERM and SIGINT
+
+Parent signal assignment:
+ $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
+
+Child signal assignment:
+ $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
+(The child dies and a SIGALRM is sent to parent, awaking parent from slumber
+ to restart a new child.)
+
+Command-line invocations:
+ B<kill> B<-s> SIGTERM I<PID>
+ B<kill> B<-s> SIGINT I<PID>
+
+Subroutine B<HUNTSMAN>:
+ This is only invoked for the B<lond> parent I<PID>.
+This kills all the children, and then the parent.
+The B<lonc.pid> file is cleared.
+
+=item *
+
+SIGHUP
+
+Current bug:
+ This signal can only be processed the first time
+on the parent process. Subsequent SIGHUP signals
+have no effect.
+
+Parent signal assignment:
+ $SIG{HUP} = \&HUPSMAN;
+
+Child signal assignment:
+ none (nothing happens)
+
+Command-line invocations:
+ B<kill> B<-s> SIGHUP I<PID>
+
+Subroutine B<HUPSMAN>:
+ This is only invoked for the B<lond> parent I<PID>,
+This kills all the children, and then the parent.
+The B<lond.pid> file is cleared.
+
+=item *
+
+SIGUSR1
+
+Parent signal assignment:
+ $SIG{USR1} = \&USRMAN;
+
+Child signal assignment:
+ $SIG{USR1}= \&logstatus;
+
+Command-line invocations:
+ B<kill> B<-s> SIGUSR1 I<PID>
+
+Subroutine B<USRMAN>:
+ When invoked for the B<lond> parent I<PID>,
+SIGUSR1 is sent to all the children, and the status of
+each connection is logged.
+
+=item *
+
+SIGUSR2
+
+Parent Signal assignment:
+ $SIG{USR2} = \&UpdateHosts
+
+Child signal assignment:
+ NONE
+
+
+=item *
+
+SIGCHLD
+
+Parent signal assignment:
+ $SIG{CHLD} = \&REAPER;
+
+Child signal assignment:
+ none
+
+Command-line invocations:
+ B<kill> B<-s> SIGCHLD I<PID>
+
+Subroutine B<REAPER>:
+ This is only invoked for the B<lond> parent I<PID>.
+Information pertaining to the child is removed.
+The socket port is cleaned up.
+
+=back
+
+B<SERVER-SIDE ACTIVITIES>
+
+Server-side information can be accepted in an encrypted or non-encrypted
+method.
+
+=over 4
+
+=item ping
+
+Query a client in the hosts.tab table; "Are you there?"
+
+=item pong
+
+Respond to a ping query.
+
+=item ekey
+
+Read in encrypted key, make cipher. Respond with a buildkey.
+
+=item load
+
+Respond with CPU load based on a computation upon /proc/loadavg.
+
+=item currentauth
+
+Reply with current authentication information (only over an
+encrypted channel).
+
+=item auth
+
+Only over an encrypted channel, reply as to whether a user's
+authentication information can be validated.
+
+=item passwd
+
+Allow for a password to be set.
+
+=item makeuser
+
+Make a user.
+
+=item passwd
+
+Allow for authentication mechanism and password to be changed.
+
+=item home
+
+Respond to a question "are you the home for a given user?"
+
+=item update
+
+Update contents of a subscribed resource.
+
+=item unsubscribe
+
+The server is unsubscribing from a resource.
+
+=item subscribe
+
+The server is subscribing to a resource.
+
+=item log
+
+Place in B<logs/lond.log>
+
+=item put
+
+stores hash in namespace
+
+=item rolesputy
+
+put a role into a user's environment
+
+=item get
+
+returns hash with keys from array
+reference filled in from namespace
+
+=item eget
+
+returns hash with keys from array
+reference filled in from namesp (encrypts the return communication)
+
+=item rolesget
+
+get a role from a user's environment
+
+=item del
+
+deletes keys out of array from namespace
+
+=item keys
+
+returns namespace keys
+
+=item dump
+
+dumps the complete (or key matching regexp) namespace into a hash
+
+=item store
+
+stores hash permanently
+for this url; hashref needs to be given and should be a \%hashname; the
+remaining args aren't required and if they aren't passed or are '' they will
+be derived from the ENV
+
+=item restore
+
+returns a hash for a given url
+
+=item querysend
+
+Tells client about the lonsql process that has been launched in response
+to a sent query.
+
+=item queryreply
+
+Accept information from lonsql and make appropriate storage in temporary
+file space.
+
+=item idput
+
+Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
+for each student, defined perhaps by the institutional Registrar.)
+
+=item idget
+
+Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
+for each student, defined perhaps by the institutional Registrar.)
+
+=item tmpput
+
+Accept and store information in temporary space.
+
+=item tmpget
+
+Send along temporarily stored information.
+
+=item ls
+
+List part of a user's directory.
+
+=item pushtable
+
+Pushes a file in /home/httpd/lonTab directory. Currently limited to:
+hosts.tab and domain.tab. The old file is copied to *.tab.backup but
+must be restored manually in case of a problem with the new table file.
+pushtable requires that the request be encrypted and validated via
+ValidateManager. The form of the command is:
+enc:pushtable tablename <tablecontents> \n
+where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
+cleartext newline.
+
+=item Hanging up (exit or init)
+
+What to do when a client tells the server that they (the client)
+are leaving the network.
+
+=item unknown command
+
+If B<lond> is sent an unknown command (not in the list above),
+it replys to the client "unknown_cmd".
+
+
+=item UNKNOWN CLIENT
+
+If the anti-spoofing algorithm cannot verify the client,
+the client is rejected (with a "refused" message sent
+to the client, and the connection is closed.
+
+=back
+
+=head1 PREREQUISITES
+
+IO::Socket
+IO::File
+Apache::File
+Symbol
+POSIX
+Crypt::IDEA
+LWP::UserAgent()
+GDBM_File
+Authen::Krb4
+Authen::Krb5
+
+=head1 COREQUISITES
+
+=head1 OSNAMES
+linux
+=head1 SCRIPT CATEGORIES
+Server/Process
+=cut