--- loncom/lond 2001/11/26 20:31:01 1.57 +++ loncom/lond 2002/02/07 10:22:44 1.70 @@ -1,6 +1,31 @@ #!/usr/bin/perl # The LearningOnline Network # lond "LON Daemon" Server (port "LOND" 5663) +# +# $Id: lond,v 1.70 2002/02/07 10:22:44 harris41 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->[$error]"); &logthis('Famous last words: '.$status.' - '.$lastlog); if ($client) { print $client "error: $error\n"; } + $server->close(); die($error); } +sub timeout { + &logthis("CRITICAL: TIME OUT ".$$.""); + &catchexception('Timeout'); +} # -------------------------------- Set signal handlers to record abnormal exits $SIG{'QUIT'}=\&catchexception; @@ -103,7 +136,7 @@ open (CONFIG,"$perlvar{'lonTabDir'}/host while ($configline=) { my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); - chomp($ip); + chomp($ip); $ip=~s/\D+$//; $hostid{$ip}=$id; if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; } $PREFORK++; @@ -130,14 +163,19 @@ $children = 0; # cu sub REAPER { # takes care of dead children $SIG{CHLD} = \&REAPER; my $pid = wait; - $children --; - &logthis("Child $pid died"); - delete $children{$pid}; + if (defined($children{$pid})) { + &logthis("Child $pid died"); + $children --; + delete $children{$pid}; + } else { + &logthis("Unknown Child $pid died"); + } } sub HUNTSMAN { # signal handler for SIGINT local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children kill 'INT' => keys %children; + &logthis("Free socket: ".shutdown($server,2)); # free up socket my $execdir=$perlvar{'lonDaemons'}; unlink("$execdir/logs/lond.pid"); &logthis("CRITICAL: Shutting down"); @@ -147,7 +185,7 @@ sub HUNTSMAN { # si sub HUPSMAN { # signal handler for SIGHUP local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children kill 'INT' => keys %children; - close($server); # free up socket + &logthis("Free socket: ".shutdown($server,2)); # free up socket &logthis("CRITICAL: Restarting"); unlink("$execdir/logs/lond.pid"); my $execdir=$perlvar{'lonDaemons'}; @@ -158,13 +196,26 @@ sub checkchildren { &initnewstatus(); &logstatus(); &logthis('Going to check on the children'); - map { + $docdir=$perlvar{'lonDocRoot'}; + foreach (sort keys %children) { sleep 1; unless (kill 'USR1' => $_) { &logthis ('Child '.$_.' is dead'); &logstatus($$.' 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( "WARNING: $clientip did not reply challenge"); - print $client "bye\n"; &status('No challenge reply '.$clientip); } } else { &logthis( "WARNING: " ."$clientip failed to initialize: >$remotereq< "); - print $client "bye\n"; &status('No init '.$clientip); } } else { &logthis( "WARNING: Unknown client $clientip"); - print $client "bye\n"; &status('Hung up on '.$clientip); } if ($clientok) { @@ -466,12 +529,13 @@ sub make_new_child { &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}"); &logthis( "Established connection: $hostid{$clientip}"); - &status('Listening to '.$hostid{$clientip}); + &status('Will listen to '.$hostid{$clientip}); # ------------------------------------------------------------ Process requests while (my $userinput=<$client>) { chomp($userinput); &status('Processing '.$hostid{$clientip}.': '.$userinput); my $wasenc=0; + alarm(120); # ------------------------------------------------------------ See if encrypted if ($userinput =~ /^enc/) { if ($cipher) { @@ -650,7 +714,7 @@ sub make_new_child { $fpnow.='/'.$fpparts[$i]; unless (-e $fpnow) { unless (mkdir($fpnow,0777)) { - $fperror="error:$!\n"; + $fperror="error:$!"; } } } @@ -1063,15 +1127,22 @@ 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 +1364,21 @@ 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}); } +# --------------------------------------------- client unknown or fishy, refuse } else { print $client "refused\n"; + $client->close(); &logthis("WARNING: " ."Rejected client $clientip, closing connection"); } @@ -1313,6 +1389,9 @@ 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 +1399,48 @@ 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