--- loncom/lond 2001/03/24 16:07:36 1.41
+++ 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,
@@ -10,11 +35,21 @@
# 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
# 03/24 Gerd Kortemeyer
-#
+# 04/02 Scott Harrison
+# 05/11,05/28,08/30 Gerd Kortemeyer
+# 9/30,10/22,11/13,11/15,11/16 Scott Harrison
+# 11/26,11/27 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
# preforker - server who forks first
# runs as a daemon
@@ -30,6 +65,11 @@ use Crypt::IDEA;
use LWP::UserAgent();
use GDBM_File;
use Authen::Krb4;
+use lib '/home/httpd/lib/perl/';
+use localauth;
+
+my $status='';
+my $lastlog='';
# grabs exception and records it to log before exiting
sub catchexception {
@@ -39,10 +79,16 @@ sub catchexception {
&logthis("CRITICAL: "
."ABNORMAL EXIT. Child $$ for server $wasserver died through "
."a crash with this error msg->[$error]");
+ &logthis('Famous last words: '.$status.' - '.$lastlog);
if ($client) { print $client "error: $error\n"; }
+ $server->close();
die($error);
}
+sub timeout {
+ &logthis("CRITICAL: TIME OUT ".$$."");
+ &catchexception('Timeout');
+}
# -------------------------------- Set signal handlers to record abnormal exits
$SIG{'QUIT'}=\&catchexception;
@@ -117,14 +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("$execdir/logs/lond.pid");
&logthis("CRITICAL: Shutting down");
@@ -134,13 +185,39 @@ sub HUNTSMAN { # si
sub HUPSMAN { # signal handler for SIGHUP
local($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'};
exec("$execdir/lond"); # here we go again
}
+sub checkchildren {
+ &initnewstatus();
+ &logstatus();
+ &logthis('Going to check on the children');
+ $docdir=$perlvar{'lonDocRoot'};
+ foreach (sort keys %children) {
+ sleep 1;
+ unless (kill 'USR1' => $_) {
+ &logthis ('Child '.$_.' is dead');
+ &logstatus($$.' is dead');
+ }
+ }
+ sleep 5;
+ foreach (sort keys %children) {
+ unless (-e "$docdir/lon-status/londchld/$_.txt") {
+ &logthis('Child '.$_.' did not respond');
+ kill 9 => $_;
+ $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
+ $subj="LON: $perlvar{'lonHostID'} killed lond process $_";
+ my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
+ $execdir=$perlvar{'lonDaemons'};
+ $result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`
+ }
+ }
+}
+
# --------------------------------------------------------------------- Logging
sub logthis {
@@ -149,9 +226,47 @@ sub logthis {
my $fh=IO::File->new(">>$execdir/logs/lond.log");
my $now=time;
my $local=localtime($now);
+ $lastlog=$local.': '.$message;
print $fh "$local ($$): $message\n";
}
+# ------------------------------------------------------------------ Log status
+
+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 {
+ 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 $$\n\n";
+ opendir(DIR,"$docdir/lon-status/londchld");
+ while ($filename=readdir(DIR)) {
+ unlink("$docdir/lon-status/londchld/$filename");
+ }
+ closedir(DIR);
+}
+
+# -------------------------------------------------------------- Status setting
+
+sub status {
+ my $what=shift;
+ my $now=time;
+ my $local=localtime($now);
+ $status=$local.': '.$what;
+}
# -------------------------------------------------------- Escape Special Chars
@@ -298,6 +413,7 @@ open (PIDSAVE,">$execdir/logs/lond.pid")
print PIDSAVE "$$\n";
close(PIDSAVE);
&logthis("CRITICAL: ---------- Starting ----------");
+&status('Starting');
# ------------------------------------------------------- Now we are on our own
@@ -308,13 +424,19 @@ for (1 .. $PREFORK) {
# ----------------------------------------------------- Install signal handlers
+&status('Forked children');
+
$SIG{CHLD} = \&REAPER;
$SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
$SIG{HUP} = \&HUPSMAN;
+$SIG{USR1} = \&checkchildren;
# And maintain the population.
while (1) {
+ &status('Sleeping');
sleep; # wait for a signal (i.e., child's death)
+ &logthis('Woke up');
+ &status('Woke up');
for ($i = $children; $i < $PREFORK; $i++) {
make_new_child(); # top up the child pool
}
@@ -338,11 +460,16 @@ sub make_new_child {
or die "Can't unblock SIGINT for fork: $!\n";
$children{$pid} = 1;
$children++;
+ &status('Started child '.$pid);
return;
} else {
# Child can *not* return from this subroutine.
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
-
+ $SIG{USR1}= \&logstatus;
+ $SIG{ALRM}= \&timeout;
+ $lastlog='Forked ';
+ $status='Forked';
+
# unblock signals
sigprocmask(SIG_UNBLOCK, $sigset)
or die "Can't unblock SIGINT for fork: $!\n";
@@ -351,8 +478,9 @@ sub make_new_child {
# handle connections until we've reached $MAX_CLIENTS_PER_CHILD
for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
+ &status('Idle, waiting for connection');
$client = $server->accept() or last;
-
+ &status('Accepted connection');
# =============================================================================
# do something with the connection
# -----------------------------------------------------------------------------
@@ -362,14 +490,19 @@ sub make_new_child {
my $clientip=inet_ntoa($iaddr);
my $clientrec=($hostid{$clientip} ne undef);
&logthis(
-"INFO: Connect from $clientip ($hostid{$clientip})");
+"INFO: Connection $i, $clientip ($hostid{$clientip})"
+ );
+ &status("Connecting $clientip ($hostid{$clientip})");
my $clientok;
if ($clientrec) {
+ &status("Waiting for init from $clientip ($hostid{$clientip})");
my $remotereq=<$client>;
$remotereq=~s/\W//g;
if ($remotereq eq 'init') {
my $challenge="$$".time;
print $client "$challenge\n";
+ &status(
+ "Waiting for challenge reply from $clientip ($hostid{$clientip})");
$remotereq=<$client>;
$remotereq=~s/\W//g;
if ($challenge eq $remotereq) {
@@ -378,28 +511,32 @@ 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 ($clientok) {
# ---------------- New known client connecting, could mean machine online again
&reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
&logthis(
"Established connection: $hostid{$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) {
@@ -414,7 +551,9 @@ sub make_new_child {
$userinput=substr($userinput,0,$cmdlength);
$wasenc=1;
}
- }
+ &logthis('Decrypted '.$hostid{$clientip}.': '.$userinput);
+ }
+
# ------------------------------------------------------------- Normal commands
# ------------------------------------------------------------------------ ping
if ($userinput =~ /^ping/) {
@@ -447,6 +586,28 @@ sub make_new_child {
$loadavg =~ s/\s.*//g;
my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
print $client "$loadpercent\n";
+# ----------------------------------------------------------------- currentauth
+ } elsif ($userinput =~ /^currentauth/) {
+ if ($wasenc==1) {
+ my ($cmd,$udom,$uname)=split(/:/,$userinput);
+ 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 $availablecontent='';
+ if ($howpwd eq 'krb4') {
+ $availablecontent=$contentpwd;
+ }
+ print $client "$howpwd:$availablecontent\n";
+ } else {
+ print $client "unknown_user\n";
+ }
+ } else {
+ print $client "refused\n";
+ }
# ------------------------------------------------------------------------ auth
} elsif ($userinput =~ /^auth/) {
if ($wasenc==1) {
@@ -466,14 +627,27 @@ sub make_new_child {
(crypt($upass,$contentpwd) eq $contentpwd);
} elsif ($howpwd eq 'unix') {
$contentpwd=(getpwnam($uname))[1];
- $pwdcorrect=
- (crypt($upass,$contentpwd) eq $contentpwd);
+ my $pwauth_path="/usr/local/sbin/pwauth";
+ unless ($contentpwd eq 'x') {
+ $pwdcorrect=
+ (crypt($upass,$contentpwd) eq $contentpwd);
+ }
+ elsif (-e $pwauth_path) {
+ open PWAUTH, "|$pwauth_path" or
+ die "Cannot invoke authentication";
+ print PWAUTH "$uname\n$upass\n";
+ close PWAUTH;
+ $pwdcorrect=!$?;
+ }
} elsif ($howpwd eq 'krb4') {
$pwdcorrect=(
Authen::Krb4::get_pw_in_tkt($uname,"",
$contentpwd,'krbtgt',$contentpwd,1,
$upass) == 0);
- }
+ } elsif ($howpwd eq 'localauth') {
+ $pwdcorrect=&localauth::localauth($uname,$upass,
+ $contentpwd);
+ }
if ($pwdcorrect) {
print $client "authorized\n";
} else {
@@ -523,6 +697,7 @@ sub make_new_child {
}
# -------------------------------------------------------------------- makeuser
} elsif ($userinput =~ /^makeuser/) {
+ my $oldumask=umask(0077);
if ($wasenc==1) {
my
($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
@@ -542,7 +717,7 @@ sub make_new_child {
$fpnow.='/'.$fpparts[$i];
unless (-e $fpnow) {
unless (mkdir($fpnow,0777)) {
- $fperror="error:$!\n";
+ $fperror="error:$!";
}
}
}
@@ -560,9 +735,29 @@ sub make_new_child {
{
my $pf = IO::File->new(">$passfilename");
print $pf "internal:$ncpass\n";
- }
+ }
print $client "ok\n";
- } elsif ($umode eq 'none') {
+ } elsif ($umode eq 'localauth') {
+ {
+ my $pf = IO::File->new(">$passfilename");
+ print $pf "localauth:$npass\n";
+ }
+ print $client "ok\n";
+ } elsif ($umode eq 'unix') {
+ {
+ my $execpath="$perlvar{'lonDaemons'}/".
+ "lcuseradd";
+ {
+ my $se = IO::File->new("|$execpath");
+ print $se "$uname\n";
+ print $se "$npass\n";
+ print $se "$npass\n";
+ }
+ my $pf = IO::File->new(">$passfilename");
+ print $pf "unix:\n";
+ }
+ print $client "ok\n";
+ } elsif ($umode eq 'none') {
{
my $pf = IO::File->new(">$passfilename");
print $pf "none:\n";
@@ -578,6 +773,67 @@ sub make_new_child {
} else {
print $client "refused\n";
}
+ umask($oldumask);
+# -------------------------------------------------------------- changeuserauth
+ } elsif ($userinput =~ /^changeuserauth/) {
+ if ($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 ($udom ne $perlvar{'lonDefDomain'}) {
+ print $client "not_right_domain\n";
+ } else {
+ if ($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 'localauth') {
+ {
+ my $pf = IO::File->new(">$passfilename");
+ print $pf "localauth:$npass\n";
+ }
+ print $client "ok\n";
+ } elsif ($umode eq 'unix') {
+ {
+ my $execpath="$perlvar{'lonDaemons'}/".
+ "lcuseradd";
+ {
+ my $se = IO::File->new("|$execpath");
+ print $se "$uname\n";
+ print $se "$npass\n";
+ print $se "$npass\n";
+ }
+ my $pf = IO::File->new(">$passfilename");
+ print $pf "unix:\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 $client "refused\n";
+ }
# ------------------------------------------------------------------------ home
} elsif ($userinput =~ /^home/) {
my ($cmd,$udom,$uname)=split(/:/,$userinput);
@@ -669,6 +925,9 @@ sub make_new_child {
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";
@@ -704,7 +963,7 @@ sub make_new_child {
chomp($what);
my $proname=propath($udom,$uname);
my $now=time;
- {
+ unless ($namespace=~/^nohist\_/) {
my $hfh;
if (
$hfh=IO::File->new(">>$proname/$namespace.hist")
@@ -829,7 +1088,7 @@ sub make_new_child {
chomp($what);
my $proname=propath($udom,$uname);
my $now=time;
- {
+ unless ($namespace=~/^nohist\_/) {
my $hfh;
if (
$hfh=IO::File->new(">>$proname/$namespace.hist")
@@ -871,15 +1130,22 @@ sub make_new_child {
}
# ------------------------------------------------------------------------ dump
} elsif ($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)) {
$qresult=~s/\&$//;
@@ -900,7 +1166,7 @@ sub make_new_child {
chomp($what);
my $proname=propath($udom,$uname);
my $now=time;
- {
+ unless ($namespace=~/^nohist\_/) {
my $hfh;
if (
$hfh=IO::File->new(">>$proname/$namespace.hist")
@@ -966,16 +1232,17 @@ sub make_new_child {
}
# ------------------------------------------------------------------- querysend
} elsif ($userinput =~ /^querysend/) {
- my ($cmd,$query,$custom)=split(/:/,$userinput);
+ my ($cmd,$query,
+ $custom,$customshow)=split(/:/,$userinput);
$query=~s/\n*$//g;
- unless ($custom) {
+ unless ($custom or $customshow) {
print $client "".
sqlreply("$hostid{$clientip}\&$query")."\n";
}
else {
print $client "".
sqlreply("$hostid{$clientip}\&$query".
- "\&$custom")."\n";
+ "\&$custom"."\&$customshow")."\n";
}
# ------------------------------------------------------------------ queryreply
} elsif ($userinput =~ /^queryreply/) {
@@ -983,8 +1250,12 @@ sub make_new_child {
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 {
@@ -1080,7 +1351,7 @@ sub make_new_child {
if (-e $ulsdir) {
if (opendir(LSDIR,$ulsdir)) {
while ($ulsfn=readdir(LSDIR)) {
- my @ulsstats=stat($ulsfn);
+ my @ulsstats=stat($ulsdir.'/'.$ulsfn);
$ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
}
closedir(LSDIR);
@@ -1090,15 +1361,28 @@ sub make_new_child {
}
if ($ulsout eq '') { $ulsout='empty'; }
print $client "$ulsout\n";
+# ------------------------------------------------------------------ Hanging up
+ } elsif (($userinput =~ /^exit/) ||
+ ($userinput =~ /^init/)) {
+ &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("WARNING: "
."Rejected client $clientip, closing connection");
}
@@ -1109,6 +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.
@@ -1116,6 +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