--- loncom/lond 2001/11/26 20:31:01 1.57
+++ loncom/lond 2002/02/06 14:18:09 1.68.2.1
@@ -1,6 +1,31 @@
#!/usr/bin/perl
# The LearningOnline Network
# lond "LON Daemon" Server (port "LOND" 5663)
+#
+# $Id: lond,v 1.68.2.1 2002/02/06 14:18:09 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/
+#
# 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,
@@ -10,6 +35,7 @@
# 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
+# YEAR=2001
# Jan 01 Scott Harrison
# 02/12 Gerd Kortemeyer
# 03/15 Scott Harrison
@@ -17,9 +43,11 @@
# 04/02 Scott Harrison
# 05/11,05/28,08/30 Gerd Kortemeyer
# 9/30,10/22,11/13,11/15,11/16 Scott Harrison
-# 11/26 Gerd Kortemeyer
-#
-# $Id: lond,v 1.57 2001/11/26 20:31:01 www Exp $
+# 11/26,11/27 Gerd Kortemeyer
+# 12/20 Scott Harrison
+# 12/22 Gerd Kortemeyer
+# YEAR=2002
+# 01/20/02,02/05 Gerd Kortemeyer
###
# based on "Perl Cookbook" ISBN 1-56592-243-3
@@ -53,9 +81,14 @@ sub catchexception {
."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 {
+ &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
+ &catchexception('Timeout');
+}
# -------------------------------- Set signal handlers to record abnormal exits
$SIG{'QUIT'}=\&catchexception;
@@ -130,14 +163,19 @@ $children = 0; # cu
sub REAPER { # takes care of dead children
$SIG{CHLD} = \&REAPER;
my $pid = wait;
- $children --;
- &logthis("Child $pid died");
- delete $children{$pid};
+ if (defined($children{$pid})) {
+ &logthis("Child $pid died");
+ $children --;
+ delete $children{$pid};
+ } else {
+ &logthis("Unknown Child $pid died");
+ }
}
sub HUNTSMAN { # signal handler for SIGINT
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
kill 'INT' => keys %children;
+ &logthis("Free socket: ".shutdown($server,2)); # free up socket
my $execdir=$perlvar{'lonDaemons'};
unlink("$execdir/logs/lond.pid");
&logthis("<font color=red>CRITICAL: Shutting down</font>");
@@ -147,7 +185,7 @@ sub HUNTSMAN { # si
sub HUPSMAN { # signal handler for SIGHUP
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
kill 'INT' => keys %children;
- close($server); # free up socket
+ &logthis("Free socket: ".shutdown($server,2)); # free up socket
&logthis("<font color=red>CRITICAL: Restarting</font>");
unlink("$execdir/logs/lond.pid");
my $execdir=$perlvar{'lonDaemons'};
@@ -158,13 +196,26 @@ sub checkchildren {
&initnewstatus();
&logstatus();
&logthis('Going to check on the children');
- map {
+ $docdir=$perlvar{'lonDocRoot'};
+ foreach (sort keys %children) {
sleep 1;
unless (kill 'USR1' => $_) {
&logthis ('Child '.$_.' is dead');
&logstatus($$.' is dead');
}
- } sort keys %children;
+ }
+ sleep 5;
+ foreach (sort keys %children) {
+ unless (-e "$docdir/lon-status/londchld/$_.txt") {
+ &logthis('Child '.$_.' did not respond');
+ kill 9 => $_;
+ $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
+ $subj="LON: $perlvar{'lonHostID'} 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 $execdir/logs/lond.log.$_`
+ }
+ }
}
# --------------------------------------------------------------------- Logging
@@ -175,6 +226,7 @@ sub logthis {
my $fh=IO::File->new(">>$execdir/logs/lond.log");
my $now=time;
my $local=localtime($now);
+ $lastlog=$local.': '.$message;
print $fh "$local ($$): $message\n";
}
@@ -182,8 +234,16 @@ sub logthis {
sub logstatus {
my $docdir=$perlvar{'lonDocRoot'};
+ {
my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
print $fh $$."\t".$status."\t".$lastlog."\n";
+ $fh->close();
+ }
+ {
+ my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
+ print $fh $status."\n".$lastlog."\n".time;
+ $fh->close();
+ }
}
sub initnewstatus {
@@ -192,6 +252,11 @@ sub initnewstatus {
my $now=time;
my $local=localtime($now);
print $fh "LOND status $local - parent $$\n\n";
+ opendir(DIR,"$docdir/lon-status/londchld");
+ while ($filename=readdir(DIR)) {
+ unlink("$docdir/lon-status/londchld/$filename");
+ }
+ closedir(DIR);
}
# -------------------------------------------------------------- Status setting
@@ -401,6 +466,7 @@ sub make_new_child {
# Child can *not* return from this subroutine.
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
$SIG{USR1}= \&logstatus;
+ $SIG{ALRM}= \&timeout;
$lastlog='Forked ';
$status='Forked';
@@ -445,20 +511,17 @@ sub make_new_child {
} else {
&logthis(
"<font color=blue>WARNING: $clientip did not reply challenge</font>");
- print $client "bye\n";
&status('No challenge reply '.$clientip);
}
} else {
&logthis(
"<font color=blue>WARNING: "
."$clientip failed to initialize: >$remotereq< </font>");
- print $client "bye\n";
&status('No init '.$clientip);
}
} else {
&logthis(
"<font color=blue>WARNING: Unknown client $clientip</font>");
- print $client "bye\n";
&status('Hung up on '.$clientip);
}
if ($clientok) {
@@ -466,12 +529,14 @@ sub make_new_child {
&reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
&logthis(
"<font color=green>Established connection: $hostid{$clientip}</font>");
- &status('Listening to '.$hostid{$clientip});
+ &status('Will listen to '.$hostid{$clientip});
# ------------------------------------------------------------ Process requests
while (my $userinput=<$client>) {
chomp($userinput);
&status('Processing '.$hostid{$clientip}.': '.$userinput);
+ &logthis('Processing '.$hostid{$clientip}.': '.$userinput);
my $wasenc=0;
+ alarm(120);
# ------------------------------------------------------------ See if encrypted
if ($userinput =~ /^enc/) {
if ($cipher) {
@@ -486,7 +551,9 @@ sub make_new_child {
$userinput=substr($userinput,0,$cmdlength);
$wasenc=1;
}
- }
+ &logthis('Decrypted '.$hostid{$clientip}.': '.$userinput);
+ }
+
# ------------------------------------------------------------- Normal commands
# ------------------------------------------------------------------------ ping
if ($userinput =~ /^ping/) {
@@ -650,7 +717,7 @@ sub make_new_child {
$fpnow.='/'.$fpparts[$i];
unless (-e $fpnow) {
unless (mkdir($fpnow,0777)) {
- $fperror="error:$!\n";
+ $fperror="error:$!";
}
}
}
@@ -1063,15 +1130,22 @@ sub make_new_child {
}
# ------------------------------------------------------------------------ dump
} elsif ($userinput =~ /^dump/) {
- my ($cmd,$udom,$uname,$namespace)
+ my ($cmd,$udom,$uname,$namespace,$regexp)
=split(/:/,$userinput);
$namespace=~s/\//\_/g;
$namespace=~s/\W//g;
+ if (defined($regexp)) {
+ $regexp=&unescape($regexp);
+ } else {
+ $regexp='.';
+ }
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 (eval('$key=~/$regexp/')) {
+ $qresult.="$key=$hash{$key}&";
+ }
}
if (untie(%hash)) {
$qresult=~s/\&$//;
@@ -1293,16 +1367,22 @@ sub make_new_child {
&logthis(
"Client $clientip ($hostid{$clientip}) hanging up: $userinput");
print $client "bye\n";
+ $client->close();
last;
# ------------------------------------------------------------- unknown command
} else {
# unknown command
print $client "unknown_cmd\n";
}
-# ------------------------------------------------------ client unknown, refuse
+# -------------------------------------------------------------------- complete
+ alarm(0);
+ &status('Listening to '.$hostid{$clientip});
+ &logthis('Completed '.$userinput.' Listening to '.$hostid{$clientip});
}
+# --------------------------------------------- client unknown or fishy, refuse
} else {
print $client "refused\n";
+ $client->close();
&logthis("<font color=blue>WARNING: "
."Rejected client $clientip, closing connection</font>");
}
@@ -1313,6 +1393,9 @@ sub make_new_child {
# tidy up gracefully and finish
+ $client->close();
+ $server->close();
+
# this exit is VERY important, otherwise the child will become
# a producer of more and more children, forking yourself into
# process death.
@@ -1320,6 +1403,48 @@ sub make_new_child {
}
}
+# ----------------------------------- POD (plain old documentation, CPAN style)
+
+=head1 NAME
+
+lond - "LON Daemon" Server (port "LOND" 5663)
+
+=head1 SYNOPSIS
+
+Should only be run as user=www. Invoked by loncron.
+
+=head1 DESCRIPTION
+
+Preforker - server who forks first. Runs as a daemon. HUPs.
+Uses IDEA encryption
+
+=head1 README
+
+Not yet written.
+
+=head1 PREREQUISITES
+
+IO::Socket
+IO::File
+Apache::File
+Symbol
+POSIX
+Crypt::IDEA
+LWP::UserAgent()
+GDBM_File
+Authen::Krb4
+
+=head1 COREQUISITES
+
+=head1 OSNAMES
+
+linux
+
+=head1 SCRIPT CATEGORIES
+
+Server/Process
+
+=cut