version 1.12, 2000/12/06 20:38:21
|
version 1.35, 2002/03/26 04:37:59
|
Line 5
|
Line 5
|
# provides persistent TCP connections to the other servers in the network |
# provides persistent TCP connections to the other servers in the network |
# through multiplexed domain sockets |
# through multiplexed domain sockets |
# |
# |
|
# $Id$ |
|
# |
|
# 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/ |
|
# |
# PID in subdir logs/lonc.pid |
# PID in subdir logs/lonc.pid |
# kill kills |
# kill kills |
# HUP restarts |
# HUP restarts |
Line 15
|
Line 39
|
# 2/8,7/25 Gerd Kortemeyer |
# 2/8,7/25 Gerd Kortemeyer |
# 12/05 Scott Harrison |
# 12/05 Scott Harrison |
# 12/05 Gerd Kortemeyer |
# 12/05 Gerd Kortemeyer |
# |
# YEAR=2001 |
|
# 01/10/01 Scott Harrison |
|
# 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer |
|
# 12/20 Scott Harrison |
|
# YEAR=2002 |
|
# 2/19/02,02/22/02,02/25/02 Gerd Kortemeyer |
|
# 3/07/02 Ron Fox |
# based on nonforker from Perl Cookbook |
# based on nonforker from Perl Cookbook |
# - server who multiplexes without forking |
# - server who multiplexes without forking |
|
|
Line 27 use Socket;
|
Line 57 use Socket;
|
use Fcntl; |
use Fcntl; |
use Tie::RefHash; |
use Tie::RefHash; |
use Crypt::IDEA; |
use Crypt::IDEA; |
|
#use Net::Ping; |
|
use LWP::UserAgent(); |
|
|
# grabs exception and records it to log before exiting |
$status=''; |
sub catchexception { |
$lastlog=''; |
my ($signal)=@_; |
$conserver='SHELL'; |
$SIG{'QUIT'}='DEFAULT'; |
$DEBUG = 0; # Set to 1 for annoyingly complete logs. |
$SIG{__DIE__}='DEFAULT'; |
|
&logthis("<font color=red>CRITICAL: " |
|
."ABNORMAL EXIT. Child $$ for server $wasserver died through " |
|
."\"$signal\" with this parameter->[$@]</font>"); |
|
die($@); |
|
} |
|
|
|
$childmaxattempts=10; |
|
|
|
# -------------------------------- Set signal handlers to record abnormal exits |
# -------------------------------- Set signal handlers to record abnormal exits |
|
|
$SIG{'QUIT'}=\&catchexception; |
&status("Init exception handlers"); |
|
$SIG{QUIT}=\&catchexception; |
$SIG{__DIE__}=\&catchexception; |
$SIG{__DIE__}=\&catchexception; |
|
|
# ------------------------------------ Read httpd access.conf and get variables |
# ------------------------------------ Read httpd access.conf and get variables |
|
&status("Read access.conf"); |
open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf"; |
open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf"; |
|
|
while ($configline=<CONFIG>) { |
while ($configline=<CONFIG>) { |
Line 59 while ($configline=<CONFIG>) {
|
Line 84 while ($configline=<CONFIG>) {
|
} |
} |
close(CONFIG); |
close(CONFIG); |
|
|
|
# ----------------------------- Make sure this process is running from user=www |
|
&status("Check user ID"); |
|
my $wwwid=getpwnam('www'); |
|
if ($wwwid!=$<) { |
|
$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; |
|
$subj="LON: $perlvar{'lonHostID'} User ID mismatch"; |
|
system("echo 'User ID mismatch. lonc must be run as user www.' |\ |
|
mailto $emailto -s '$subj' > /dev/null"); |
|
exit 1; |
|
} |
|
|
# --------------------------------------------- Check if other instance running |
# --------------------------------------------- Check if other instance running |
|
|
my $pidfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; |
my $pidfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; |
Line 77 open (CONFIG,"$perlvar{'lonTabDir'}/host
|
Line 113 open (CONFIG,"$perlvar{'lonTabDir'}/host
|
while ($configline=<CONFIG>) { |
while ($configline=<CONFIG>) { |
my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); |
my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); |
chomp($ip); |
chomp($ip); |
$hostip{$id}=$ip; |
if ($ip) { |
|
$hostip{$id}=$ip; |
|
$hostname{$id}=$name; |
|
} |
} |
} |
|
|
close(CONFIG); |
close(CONFIG); |
|
|
# -------------------------------------------------------- Routines for forking |
# -------------------------------------------------------- Routines for forking |
Line 90 close(CONFIG);
|
Line 130 close(CONFIG);
|
%childatt = (); # number of attempts to start server |
%childatt = (); # number of attempts to start server |
# for ID |
# for ID |
|
|
sub REAPER { # takes care of dead children |
$childmaxattempts=5; |
$SIG{CHLD} = \&REAPER; |
|
my $pid = wait; |
|
my $wasserver=$children{$pid}; |
|
&logthis("<font color=red>CRITICAL: " |
|
."Child $pid for server $wasserver died ($childatt{$wasserver})</font>"); |
|
delete $children{$pid}; |
|
delete $childpid{$wasserver}; |
|
my $port = "$perlvar{'lonSockDir'}/$wasserver"; |
|
unlink($port); |
|
} |
|
|
|
sub HUNTSMAN { # signal handler for SIGINT |
|
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
|
kill 'INT' => keys %children; |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
unlink("$execdir/logs/lonc.pid"); |
|
&logthis("<font color=red>CRITICAL: Shutting down</font>"); |
|
exit; # clean up with dignity |
|
} |
|
|
|
sub HUPSMAN { # signal handler for SIGHUP |
|
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
|
kill 'INT' => keys %children; |
|
&logthis("<font color=red>CRITICAL: Restarting</font>"); |
|
unlink("$execdir/logs/lonc.pid"); |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
exec("$execdir/lonc"); # here we go again |
|
} |
|
|
|
sub USRMAN { |
|
&logthis("USR1: Trying to establish connections again"); |
|
foreach $thisserver (keys %hostip) { |
|
$answer=subreply("ping",$thisserver); |
|
&logthis("USR1: Ping $thisserver " |
|
."(pid >$childpid{$thisserver}<, $childatt{thisserver} attempts): " |
|
." >$answer<"); |
|
} |
|
%childatt=(); |
|
} |
|
|
|
# -------------------------------------------------- Non-critical communication |
|
sub subreply { |
|
my ($cmd,$server)=@_; |
|
my $answer=''; |
|
if ($server ne $perlvar{'lonHostID'}) { |
|
my $peerfile="$perlvar{'lonSockDir'}/$server"; |
|
my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", |
|
Type => SOCK_STREAM, |
|
Timeout => 10) |
|
or return "con_lost"; |
|
print $sclient "$cmd\n"; |
|
my $answer=<$sclient>; |
|
chomp($answer); |
|
if (!$answer) { $answer="con_lost"; } |
|
} else { $answer='self_reply'; } |
|
return $answer; |
|
} |
|
|
|
# --------------------------------------------------------------------- Logging |
|
|
|
sub logthis { |
|
my $message=shift; |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
my $fh=IO::File->new(">>$execdir/logs/lonc.log"); |
|
my $now=time; |
|
my $local=localtime($now); |
|
print $fh "$local ($$): $message\n"; |
|
} |
|
|
|
|
|
sub logperm { |
|
my $message=shift; |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
my $now=time; |
|
my $local=localtime($now); |
|
my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log"); |
|
print $fh "$now:$message:$local\n"; |
|
} |
|
|
|
# ---------------------------------------------------- Fork once and dissociate |
# ---------------------------------------------------- Fork once and dissociate |
|
&status("Fork and dissociate"); |
$fpid=fork; |
$fpid=fork; |
exit if $fpid; |
exit if $fpid; |
die "Couldn't fork: $!" unless defined ($fpid); |
die "Couldn't fork: $!" unless defined ($fpid); |
|
|
POSIX::setsid() or die "Can't start new session: $!"; |
POSIX::setsid() or die "Can't start new session: $!"; |
|
|
# ------------------------------------------------------- Write our PID on disk |
$conserver='PARENT'; |
|
|
|
# ------------------------------------------------------- Write our PID on disk |
|
&status("Write PID"); |
$execdir=$perlvar{'lonDaemons'}; |
$execdir=$perlvar{'lonDaemons'}; |
open (PIDSAVE,">$execdir/logs/lonc.pid"); |
open (PIDSAVE,">$execdir/logs/lonc.pid"); |
print PIDSAVE "$$\n"; |
print PIDSAVE "$$\n"; |
Line 192 $SIG{HUP}=$SIG{USR1}='IGNORE';
|
Line 156 $SIG{HUP}=$SIG{USR1}='IGNORE';
|
|
|
# Fork off our children, one for every server |
# Fork off our children, one for every server |
|
|
|
&status("Forking ..."); |
|
|
foreach $thisserver (keys %hostip) { |
foreach $thisserver (keys %hostip) { |
make_new_child($thisserver); |
#if (&online($hostname{$thisserver})) { |
|
make_new_child($thisserver); |
|
#} |
} |
} |
|
|
&logthis("Done starting initial servers"); |
&logthis("Done starting initial servers"); |
# ----------------------------------------------------- Install signal handlers |
# ----------------------------------------------------- Install signal handlers |
|
|
$SIG{CHLD} = \&REAPER; |
|
$SIG{INT} = $SIG{TERM} = \&HUNTSMAN; |
$SIG{INT} = $SIG{TERM} = \&HUNTSMAN; |
$SIG{HUP} = \&HUPSMAN; |
$SIG{HUP} = \&HUPSMAN; |
$SIG{USR1} = \&USRMAN; |
$SIG{USR1} = \&USRMAN; |
|
|
# And maintain the population. |
# And maintain the population. |
while (1) { |
while (1) { |
sleep; # wait for a signal (i.e., child's death) |
my $deadpid = wait; # Wait for the next child to die. |
# See who died and start new one |
# See who died and start new one |
foreach $thisserver (keys %hostip) { |
&status("Woke up"); |
if (!$childpid{$thisserver}) { |
my $skipping=''; |
if ($childatt{$thisserver}<=$childmaxattempts) { |
|
$childatt{$thisserver}++; |
if(exists($children{$deadpid})) { |
&logthis( |
|
"<font color=yellow>INFO: Trying to reconnect for $thisserver " |
$thisserver = $children{$deadpid}; # Look name of dead guy's peer. |
."($childatt{$thisserver} of $childmaxattempts attempts)</font>"); |
|
make_new_child($thisserver); |
delete($children{$deadpid}); # Get rid of dead hash entry. |
} |
|
} |
if($childatt{$thisserver} < $childmaxattempts) { |
|
$childatt{$thisserver}++; |
|
&logthis( |
|
"<font color=yellow>INFO: Trying to reconnect for $thisserver " |
|
."($childatt{$thisserver} of $childmaxattempts attempts)</font>"); |
|
make_new_child($thisserver); |
|
|
|
} |
|
else { |
|
$skipping .= $thisserver.' '; |
|
} |
|
if($skipping) { |
|
&logthis("<font color=blue>WARNING: Skipped $skipping</font>"); |
|
|
|
} |
} |
} |
|
|
} |
} |
|
|
|
|
|
|
sub make_new_child { |
sub make_new_child { |
|
|
my $conserver=shift; |
$newserver=shift; |
my $pid; |
my $pid; |
my $sigset; |
my $sigset; |
&logthis("Attempting to start child for server $conserver"); |
&logthis("Attempting to start child for server $newserver"); |
# block signal for fork |
# block signal for fork |
$sigset = POSIX::SigSet->new(SIGINT); |
$sigset = POSIX::SigSet->new(SIGINT); |
sigprocmask(SIG_BLOCK, $sigset) |
sigprocmask(SIG_BLOCK, $sigset) |
Line 239 sub make_new_child {
|
Line 223 sub make_new_child {
|
# Parent records the child's birth and returns. |
# Parent records the child's birth and returns. |
sigprocmask(SIG_UNBLOCK, $sigset) |
sigprocmask(SIG_UNBLOCK, $sigset) |
or die "Can't unblock SIGINT for fork: $!\n"; |
or die "Can't unblock SIGINT for fork: $!\n"; |
$children{$pid} = $conserver; |
$children{$pid} = $newserver; |
$childpid{$conserver} = $pid; |
$childpid{$newserver} = $pid; |
return; |
return; |
} else { |
} else { |
|
$conserver=$newserver; |
# Child can *not* return from this subroutine. |
# Child can *not* return from this subroutine. |
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before |
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before |
|
$SIG{USR1}= \&logstatus; |
|
|
# unblock signals |
# unblock signals |
sigprocmask(SIG_UNBLOCK, $sigset) |
sigprocmask(SIG_UNBLOCK, $sigset) |
or die "Can't unblock SIGINT for fork: $!\n"; |
or die "Can't unblock SIGINT for fork: $!\n"; |
Line 255 sub make_new_child {
|
Line 241 sub make_new_child {
|
$port = "$perlvar{'lonSockDir'}/$conserver"; |
$port = "$perlvar{'lonSockDir'}/$conserver"; |
|
|
unlink($port); |
unlink($port); |
# ---------------------------------------------------- Client to network server |
|
unless ( |
|
$remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver}, |
|
PeerPort => $perlvar{'londPort'}, |
|
Proto => "tcp", |
|
Type => SOCK_STREAM) |
|
) { |
|
my $st=120+int(rand(240)); |
|
&logthis( |
|
"<font color=blue>WARNING: Couldn't connect $conserver ($st secs): $@</font>"); |
|
sleep($st); |
|
exit; |
|
}; |
|
# --------------------------------------- Send a ping to make other end do USR1 |
|
print $remotesock "init\n"; |
|
$answer=<$remotesock>; |
|
print $remotesock "$answer"; |
|
$answer=<$remotesock>; |
|
chomp($answer); |
|
&logthis("Init reply for $conserver: >$answer<"); |
|
sleep 5; |
|
print $remotesock "pong\n"; |
|
$answer=<$remotesock>; |
|
chomp($answer); |
|
&logthis("Pong reply for $conserver: >$answer<"); |
|
# ----------------------------------------------------------- Initialize cipher |
|
|
|
print $remotesock "ekey\n"; |
# -------------------------------------------------------------- Open other end |
my $buildkey=<$remotesock>; |
|
my $key=$conserver.$perlvar{'lonHostID'}; |
|
$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); |
|
if ($cipher=new IDEA $cipherkey) { |
|
&logthis("Secure connection initialized: $conserver"); |
|
} else { |
|
my $st=120+int(rand(240)); |
|
&logthis( |
|
"<font color=blue>WARNING: ". |
|
"Could not establish secure connection, $conserver ($st secs)!</font>"); |
|
sleep($st); |
|
exit; |
|
} |
|
|
|
|
&openremote($conserver); |
|
&logthis("<font color=green> Connection to $conserver open </font>"); |
# ----------------------------------------- We're online, send delayed messages |
# ----------------------------------------- We're online, send delayed messages |
|
&status("Checking for delayed messages"); |
|
|
my @allbuffered; |
my @allbuffered; |
my $path="$perlvar{'lonSockDir'}/delayed"; |
my $path="$perlvar{'lonSockDir'}/delayed"; |
Line 310 if ($cipher=new IDEA $cipherkey) {
|
Line 255 if ($cipher=new IDEA $cipherkey) {
|
@allbuffered=grep /\.$conserver$/, readdir DIRHANDLE; |
@allbuffered=grep /\.$conserver$/, readdir DIRHANDLE; |
closedir(DIRHANDLE); |
closedir(DIRHANDLE); |
my $dfname; |
my $dfname; |
map { |
foreach (@allbuffered) { |
|
&status("Sending delayed: $_"); |
$dfname="$path/$_"; |
$dfname="$path/$_"; |
&logthis($dfname); |
if($DEBUG) { &logthis('Sending '.$dfname); } |
my $wcmd; |
my $wcmd; |
{ |
{ |
my $dfh=IO::File->new($dfname); |
my $dfh=IO::File->new($dfname); |
Line 333 if ($cipher=new IDEA $cipherkey) {
|
Line 279 if ($cipher=new IDEA $cipherkey) {
|
} |
} |
$cmd="enc:$cmdlength:$encrequest\n"; |
$cmd="enc:$cmdlength:$encrequest\n"; |
} |
} |
|
$answer = londtransaction($remotesock, $cmd, 60); |
print $remotesock "$cmd\n"; |
|
$answer=<$remotesock>; |
|
chomp($answer); |
chomp($answer); |
if ($answer ne '') { |
|
|
if (($answer ne '') && ($@!~/timeout/)) { |
unlink("$dfname"); |
unlink("$dfname"); |
&logthis("Delayed $cmd to $conserver: >$answer<"); |
&logthis("Delayed $cmd: >$answer<"); |
&logperm("S:$conserver:$bcmd"); |
&logperm("S:$conserver:$bcmd"); |
} |
} |
} @allbuffered; |
} |
|
if($DEBUG) { &logthis("<font color=green> Delayed transactions sent"); } |
|
|
# ------------------------------------------------------- Listen to UNIX socket |
# ------------------------------------------------------- Listen to UNIX socket |
|
&status("Opening socket"); |
unless ( |
unless ( |
$server = IO::Socket::UNIX->new(Local => $port, |
$server = IO::Socket::UNIX->new(Local => $port, |
Type => SOCK_STREAM, |
Type => SOCK_STREAM, |
Line 353 unless (
|
Line 300 unless (
|
my $st=120+int(rand(240)); |
my $st=120+int(rand(240)); |
&logthis( |
&logthis( |
"<font color=blue>WARNING: ". |
"<font color=blue>WARNING: ". |
"Can't make server socket $conserver ($st secs): $@</font>"); |
"Can't make server socket ($st secs): .. exiting</font>"); |
sleep($st); |
sleep($st); |
exit; |
exit; |
}; |
}; |
|
|
# ----------------------------------------------------------------------------- |
# ----------------------------------------------------------------------------- |
|
|
&logthis("<font color=green>$conserver online</font>"); |
&logthis("<font color=green>$conserver online</font>"); |
Line 367 unless (
|
Line 314 unless (
|
%inbuffer = (); |
%inbuffer = (); |
%outbuffer = (); |
%outbuffer = (); |
%ready = (); |
%ready = (); |
|
%servers = (); # To be compatible with make filevector. indexed by |
|
# File descriptors, values are file descriptors. |
|
# note that the accept socket is omitted. |
|
|
tie %ready, 'Tie::RefHash'; |
tie %ready, 'Tie::RefHash'; |
|
|
Line 379 while (1) {
|
Line 329 while (1) {
|
my $rv; |
my $rv; |
my $data; |
my $data; |
|
|
# check for new information on the connections we have |
my $infdset; # bit vec of fd's to select on input. |
|
my $inreadyset; # Bit vec of fd's ready for input. |
|
|
|
my $outfdset; # Bit vec of fd's to select on output. |
|
my $outreadyset; # bit vec of fds ready for output. |
|
|
|
|
|
$infdset = MakeFileVector(\%servers); |
|
$outfdset= MakeFileVector(\%outbuffer); |
|
|
|
# check for new information on the connections we have |
# anything to read or accept? |
# anything to read or accept? |
foreach $client ($select->can_read(1)) { |
|
|
|
|
foreach $client ($select->can_read(00.10)) { |
if ($client == $server) { |
if ($client == $server) { |
# accept a new connection |
# accept a new connection |
|
&status("Accept new connection: $conserver"); |
$client = $server->accept(); |
$client = $server->accept(); |
$select->add($client); |
$select->add($client); |
nonblock($client); |
nonblock($client); |
Line 401 while (1) {
|
Line 360 while (1) {
|
delete $outbuffer{$client}; |
delete $outbuffer{$client}; |
delete $ready{$client}; |
delete $ready{$client}; |
|
|
|
&status("Idle"); |
$select->remove($client); |
$select->remove($client); |
close $client; |
close $client; |
next; |
next; |
Line 408 while (1) {
|
Line 368 while (1) {
|
|
|
$inbuffer{$client} .= $data; |
$inbuffer{$client} .= $data; |
|
|
|
|
# test whether the data in the buffer or the data we |
# test whether the data in the buffer or the data we |
# just read means there is a complete request waiting |
# just read means there is a complete request waiting |
# to be fulfilled. If there is, set $ready{$client} |
# to be fulfilled. If there is, set $ready{$client} |
Line 417 while (1) {
|
Line 378 while (1) {
|
} |
} |
} |
} |
} |
} |
|
|
# Any complete requests to process? |
# Any complete requests to process? |
foreach $client (keys %ready) { |
foreach $client (keys %ready) { |
handle($client); |
handle($client); |
} |
} |
|
|
# Buffers to flush? |
# Buffers to flush? |
foreach $client ($select->can_write(1)) { |
foreach $client ($select->can_write(1)) { |
# Skip this client if we have nothing to say |
# Skip this client if we have nothing to say |
next unless exists $outbuffer{$client}; |
next unless exists $outbuffer{$client}; |
|
|
$rv = $client->send($outbuffer{$client}, 0); |
$rv = $client->send($outbuffer{$client}, 0); |
|
|
|
unless ($outbuffer{$client} eq "con_lost\n") { |
unless (defined $rv) { |
unless (defined $rv) { |
# Whine, but move on. |
# Whine, but move on. |
warn "I was told I could write, but I can't.\n"; |
&logthis("I was told I could write, but I can't.\n"); |
next; |
next; |
} |
} |
|
$errno=$!; |
if (($rv == length $outbuffer{$client}) || |
if (($rv == length $outbuffer{$client}) || |
($! == POSIX::EWOULDBLOCK)) { |
($errno == POSIX::EWOULDBLOCK) || ($errno == 0)) { |
substr($outbuffer{$client}, 0, $rv) = ''; |
substr($outbuffer{$client}, 0, $rv) = ''; |
delete $outbuffer{$client} unless length $outbuffer{$client}; |
delete $outbuffer{$client} unless length $outbuffer{$client}; |
} else { |
} else { |
# Couldn't write all the data, and it wasn't because |
# Couldn't write all the data, and it wasn't because |
# it would have blocked. Shutdown and move on. |
# it would have blocked. Shutdown and move on. |
|
|
|
&logthis("Dropping data with ".$errno.": ". |
|
length($outbuffer{$client}).", $rv"); |
|
|
delete $inbuffer{$client}; |
delete $inbuffer{$client}; |
delete $outbuffer{$client}; |
delete $outbuffer{$client}; |
delete $ready{$client}; |
delete $ready{$client}; |
Line 449 while (1) {
|
Line 417 while (1) {
|
close($client); |
close($client); |
next; |
next; |
} |
} |
|
} else { |
|
# -------------------------------------------------------- Wow, connection lost |
|
&logthis( |
|
"<font color=red>CRITICAL: Closing connection</font>"); |
|
&status("Connection lost"); |
|
$remotesock->shutdown(2); |
|
&logthis("Attempting to open new connection"); |
|
&openremote($conserver); |
|
} |
} |
} |
|
|
} |
} |
} |
} |
|
|
# ------------------------------------------------------- End of make_new_child |
# ------------------------------------------------------- End of make_new_child |
|
|
|
|
|
# |
|
# Make a vector of file descriptors to wait for in a select. |
|
# parameters: |
|
# \%fdhash -reference to a hash which has IO::Socket's as indices. |
|
# We only care about the indices, not the values. |
|
# A select vector is created from all indices of the hash. |
|
|
|
sub MakeFileVector |
|
{ |
|
my $fdhash = shift; |
|
my $selvar = ""; |
|
|
|
foreach $socket (keys %fdhash) { |
|
vec($selvar, ($fdhash->{$socket})->fileno, 1) = 1; |
|
} |
|
return $selvar; |
|
} |
|
|
|
|
|
# |
|
# HandleOutput: |
|
# Processes output on a buffered set of file descriptors which are |
|
# ready to be read. |
|
# Parameters: |
|
# $selvector - Vector of writable file descriptors which are writable. |
|
# \%sockets - Vector of socket references indexed by socket. |
|
# \%buffers - Reference to a hash containing output buffers. |
|
# Hashes are indexed by sockets. The file descriptors of some |
|
# of those sockets will be present in $selvector. |
|
# For each one of those, we will attempt to write the output |
|
# buffer to the socket. Note that we will assume that |
|
# the sockets are being run in non blocking mode. |
|
# \%inbufs - Reference to hash containing input buffers. |
|
# \%readys - Reference to hash containing flags for items with complete |
|
# requests. |
|
# |
|
sub HandleOutput |
|
{ |
|
my $selvector = shift; |
|
my $sockets = shift; |
|
my $buffers = shift; |
|
my $inbufs = shift; |
|
my $readys = shift; |
|
|
|
foreach $sock (keys %buffers) { |
|
my $socket = $sockets->{$sock}; |
|
if(vec($selvector, $$socket->fileno, 1)) { # $socket is writable. |
|
my $rv = $$socket->send($buffers->{$sock}, 0); |
|
$errno = $!; |
|
unless ($buffers->{$sock} eq "con_lost\n") { |
|
unless (defined $rv) { # Write failed... could be EINTR |
|
unless ($errno == POSIX::EINTR) { |
|
&logthis("Write failed on writable socket"); |
|
} # EINTR is not an error .. just retry. |
|
next; |
|
} |
|
if( ($rv == length $buffers->{$sock}) || |
|
($errno == POSIX::EWOULDBLOCK) || |
|
($errno == POSIX::EAGAIN) || # same as above. |
|
($errno == POSIX::EINTR) || # signal during IO |
|
($errno == 0)) { |
|
substr($buffers->{$sock}, 0, $rv)=""; # delete written part |
|
delete $buffers->{$sock} unless length $buffers->{$sock}; |
|
} else { |
|
# For some reason the write failed with an error code |
|
# we didn't look for. Shutdown the socket. |
|
&logthis("Unable to write data with ".$errno.": ". |
|
"Dropping data: ".length($buffers->{$sock}). |
|
", $rv"); |
|
# |
|
# kill off the buffers in the hash: |
|
|
|
delete $buffers->{$sock}; |
|
delete $inbufs->{$sock}; |
|
delete $readys->{$sock}; |
|
|
|
close($$socket); # Close the client socket. |
|
next; |
|
} |
|
} else { # Kludgy way to mark lond connection lost. |
|
&logthis( |
|
"<font color=red>CRITICAL lond connection lost</font>"); |
|
status("Connection lost"); |
|
$remotesock->shutdown(2); |
|
&logthis("Attempting to open a new connection"); |
|
&openremot($conserver); |
|
} |
|
|
|
} |
|
} |
|
|
|
} |
|
# |
|
# HandleInput - Deals with input on client sockets. |
|
# Each socket has an associated input buffer. |
|
# For each readable socket, the currently available |
|
# data is appended to this buffer. |
|
# If necessary, the buffer is created. |
|
# On various failures, we may shutdown the client. |
|
# Parameters: |
|
# $selvec - Vector of readable sockets. |
|
# \%sockets - Refers to the Hash of sockets indexed by sockets. |
|
# Each of these may or may not have it's fd bit set |
|
# in the $selvec. |
|
# \%ibufs - Refers to the hash of input buffers indexed by socket. |
|
# \%obufs - Hash of output buffers indexed by socket. |
|
# \%ready - Hash of ready flags indicating the existence of a completed |
|
# Request. |
|
sub HandleInput |
|
{ |
|
|
|
# Marshall the parameters. Note that the hashes are actually |
|
# references not values. |
|
|
|
my $selvec = shift; |
|
my $sockets = shift; |
|
my $ibufs = shift; |
|
my $obufs = shift; |
|
my $ready = shift; |
|
|
|
foreach $sock (keys %sockets) { |
|
my $socket = $sockets->{$sock}; |
|
if(vec($selvec, $$socket->fileno, 1)) { # Socket which is readable. |
|
|
|
# Attempt to read the data and do error management. |
|
my $data = ''; |
|
my $rv = $$socket->recv($data, POSIX::BUFSIZ, 0); |
|
unless (defined($rv) && length $data) { |
|
|
|
# Read an end of file.. this is a disconnect from the peer. |
|
|
|
delete $sockets->{$sock}; |
|
delete $ibufs->{$sock}; |
|
delete $obufs->{$sock}; |
|
delete $ready->{$sock}; |
|
|
|
status("Idle"); |
|
close $$socket; |
|
next; |
|
} |
|
# Append the read data to the input buffer. If the buffer |
|
# now contains a \n the request is complete and we can |
|
# mark this in the $ready hash (one request for each \n.) |
|
|
|
$ibufs->{$sock} .= $data; |
|
while($ibufs->{$sock} =~ s/(.*\n)//) { |
|
push(@{$ready->{$sock}}, $1); |
|
} |
|
|
|
} |
|
} |
|
# Now handle any requests which are ready: |
|
|
|
foreach $client (keys %ready) { |
|
handle($client); |
|
} |
|
} |
|
|
# handle($socket) deals with all pending requests for $client |
# handle($socket) deals with all pending requests for $client |
|
# |
sub handle { |
sub handle { |
# requests are in $ready{$client} |
# requests are in $ready{$client} |
# send output to $outbuffer{$client} |
# send output to $outbuffer{$client} |
my $client = shift; |
my $client = shift; |
my $request; |
my $request; |
|
|
foreach $request (@{$ready{$client}}) { |
foreach $request (@{$ready{$client}}) { |
# ============================================================= Process request |
# ============================================================= Process request |
# $request is the text of the request |
# $request is the text of the request |
# put text of reply into $outbuffer{$client} |
# put text of reply into $outbuffer{$client} |
|
# ------------------------------------------------------------ Is this the end? |
|
chomp($request); |
|
if($DEBUG) { |
|
&logthis("<font color=green> Request $request processing starts</font>"); |
|
} |
|
if ($request eq "close_connection_exit\n") { |
|
&status("Request close connection"); |
|
&logthis( |
|
"<font color=red>CRITICAL: Request Close Connection ... exiting</font>"); |
|
$remotesock->shutdown(2); |
|
$server->close(); |
|
exit; |
|
} |
# ----------------------------------------------------------------------------- |
# ----------------------------------------------------------------------------- |
if ($request =~ /^encrypt\:/) { |
if ($request =~ /^encrypt\:/) { |
my $cmd=$request; |
my $cmd=$request; |
Line 478 sub handle {
|
Line 628 sub handle {
|
$encrequest.= |
$encrequest.= |
unpack("H16",$cipher->encrypt(substr($cmd,$encidx,8))); |
unpack("H16",$cipher->encrypt(substr($cmd,$encidx,8))); |
} |
} |
$request="enc:$cmdlength:$encrequest\n"; |
$request="enc:$cmdlength:$encrequest"; |
} |
} |
print $remotesock "$request"; |
# --------------------------------------------------------------- Main exchange |
$answer=<$remotesock>; |
$answer = londtransaction($remotesock, $request, 300); |
|
|
|
if($DEBUG) { |
|
&logthis("<font color=green> Request data exchange complete"); |
|
} |
|
if ($@=~/timeout/) { |
|
$answer=''; |
|
&logthis( |
|
"<font color=red>CRITICAL: Timeout: $request</font>"); |
|
} |
|
|
|
|
if ($answer) { |
if ($answer) { |
if ($answer =~ /^enc/) { |
if ($answer =~ /^enc/) { |
my ($cmd,$cmdlength,$encinput)=split(/:/,$answer); |
my ($cmd,$cmdlength,$encinput)=split(/:/,$answer); |
Line 495 sub handle {
|
Line 656 sub handle {
|
$answer=substr($answer,0,$cmdlength); |
$answer=substr($answer,0,$cmdlength); |
$answer.="\n"; |
$answer.="\n"; |
} |
} |
|
if($DEBUG) { |
|
&logthis("sending $answer to client\n"); |
|
} |
$outbuffer{$client} .= $answer; |
$outbuffer{$client} .= $answer; |
} else { |
} else { |
$outbuffer{$client} .= "con_lost\n"; |
$outbuffer{$client} .= "con_lost\n"; |
} |
} |
|
|
|
&status("Completed: $request"); |
|
if($DEBUG) { |
|
&logthis("<font color=green> Request processing complete</font>"); |
|
} |
# ===================================================== Done processing request |
# ===================================================== Done processing request |
} |
} |
delete $ready{$client}; |
delete $ready{$client}; |
# -------------------------------------------------------------- End non-forker |
# -------------------------------------------------------------- End non-forker |
|
if($DEBUG) { |
|
&logthis("<font color=green> requests for child handled</font>"); |
|
} |
} |
} |
# ---------------------------------------------------------- End make_new_child |
# ---------------------------------------------------------- End make_new_child |
} |
} |
Line 520 sub nonblock {
|
Line 691 sub nonblock {
|
or die "Can't make socket nonblocking: $!\n"; |
or die "Can't make socket nonblocking: $!\n"; |
} |
} |
|
|
|
|
|
sub openremote { |
|
# ---------------------------------------------------- Client to network server |
|
|
|
my $conserver=shift; |
|
|
|
&status("Opening TCP"); |
|
my $st=120+int(rand(240)); # Sleep before opening: |
|
|
|
unless ( |
|
$remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver}, |
|
PeerPort => $perlvar{'londPort'}, |
|
Proto => "tcp", |
|
Type => SOCK_STREAM) |
|
) { |
|
|
|
&logthis( |
|
"<font color=blue>WARNING: Couldn't connect to $conserver ($st secs): </font>"); |
|
sleep($st); |
|
exit; |
|
}; |
|
# ----------------------------------------------------------------- Init dialog |
|
|
|
&logthis("<font color=green>INFO Connected to $conserver, initing </font>"); |
|
&status("Init dialogue: $conserver"); |
|
|
|
$answer = londtransaction($remotesock, "init", 60); |
|
chomp($answer); |
|
$answer = londtransaction($remotesock, $answer, 60); |
|
chomp($answer); |
|
|
|
if ($@=~/timeout/) { |
|
&logthis("Timed out during init.. exiting"); |
|
exit; |
|
} |
|
|
|
if ($answer ne 'ok') { |
|
&logthis("Init reply: >$answer<"); |
|
my $st=120+int(rand(240)); |
|
&logthis( |
|
"<font color=blue>WARNING: Init failed ($st secs)</font>"); |
|
sleep($st); |
|
exit; |
|
} |
|
|
|
sleep 5; |
|
&status("Ponging"); |
|
print $remotesock "pong\n"; |
|
$answer=<$remotesock>; |
|
chomp($answer); |
|
if ($answer!~/^$conserver/) { |
|
&logthis("Pong reply: >$answer<"); |
|
} |
|
# ----------------------------------------------------------- Initialize cipher |
|
|
|
&status("Initialize cipher"); |
|
print $remotesock "ekey\n"; |
|
my $buildkey=<$remotesock>; |
|
my $key=$conserver.$perlvar{'lonHostID'}; |
|
$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); |
|
if ($cipher=new IDEA $cipherkey) { |
|
&logthis("Secure connection initialized"); |
|
} else { |
|
my $st=120+int(rand(240)); |
|
&logthis( |
|
"<font color=blue>WARNING: ". |
|
"Could not establish secure connection ($st secs)!</font>"); |
|
sleep($st); |
|
exit; |
|
} |
|
&logthis("<font color=green> Remote open success </font>"); |
|
} |
|
|
|
|
|
|
|
# grabs exception and records it to log before exiting |
|
sub catchexception { |
|
my ($signal)=@_; |
|
$SIG{QUIT}='DEFAULT'; |
|
$SIG{__DIE__}='DEFAULT'; |
|
chomp($signal); |
|
&logthis("<font color=red>CRITICAL: " |
|
."ABNORMAL EXIT. Child $$ for server [$wasserver] died through " |
|
."\"$signal\" with parameter </font>"); |
|
die("Signal abend"); |
|
} |
|
|
|
# -------------------------------------- Routines to see if other box available |
|
|
|
#sub online { |
|
# my $host=shift; |
|
# &status("Pinging ".$host); |
|
# my $p=Net::Ping->new("tcp",20); |
|
# my $online=$p->ping("$host"); |
|
# $p->close(); |
|
# undef ($p); |
|
# return $online; |
|
#} |
|
|
|
sub connected { |
|
my ($local,$remote)=@_; |
|
&status("Checking connection $local to $remote"); |
|
$local=~s/\W//g; |
|
$remote=~s/\W//g; |
|
|
|
unless ($hostname{$local}) { return 'local_unknown'; } |
|
unless ($hostname{$remote}) { return 'remote_unknown'; } |
|
|
|
#unless (&online($hostname{$local})) { return 'local_offline'; } |
|
|
|
my $ua=new LWP::UserAgent; |
|
|
|
my $request=new HTTP::Request('GET', |
|
"http://".$hostname{$local}.'/cgi-bin/ping.pl?'.$remote); |
|
|
|
my $response=$ua->request($request); |
|
|
|
unless ($response->is_success) { return 'local_error'; } |
|
|
|
my $reply=$response->content; |
|
$reply=(split("\n",$reply))[0]; |
|
$reply=~s/\W//g; |
|
if ($reply ne $remote) { return $reply; } |
|
return 'ok'; |
|
} |
|
|
|
|
|
|
|
sub hangup { |
|
foreach (keys %children) { |
|
$wasserver=$children{$_}; |
|
&status("Closing $wasserver"); |
|
&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver)); |
|
&status("Kill PID $_ for $wasserver"); |
|
kill ('INT',$_); |
|
} |
|
} |
|
|
|
sub HUNTSMAN { # signal handler for SIGINT |
|
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
|
&hangup(); |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
unlink("$execdir/logs/lonc.pid"); |
|
&logthis("<font color=red>CRITICAL: Shutting down</font>"); |
|
exit; # clean up with dignity |
|
} |
|
|
|
sub HUPSMAN { # signal handler for SIGHUP |
|
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
|
&hangup(); |
|
&logthis("<font color=red>CRITICAL: Restarting</font>"); |
|
unlink("$execdir/logs/lonc.pid"); |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
exec("$execdir/lonc"); # here we go again |
|
} |
|
|
|
sub checkchildren { |
|
&initnewstatus(); |
|
&logstatus(); |
|
&logthis('Going to check on the children'); |
|
foreach (sort keys %children) { |
|
sleep 1; |
|
unless (kill 'USR1' => $_) { |
|
&logthis ('<font color=red>CRITICAL: Child '.$_.' is dead</font>'); |
|
&logstatus($$.' is dead'); |
|
} |
|
} |
|
} |
|
|
|
sub USRMAN { |
|
&logthis("USR1: Trying to establish connections again"); |
|
%childatt=(); |
|
&checkchildren(); |
|
} |
|
|
|
# -------------------------------------------------- Non-critical communication |
|
sub subreply { |
|
my ($cmd,$server)=@_; |
|
my $answer=''; |
|
if ($server ne $perlvar{'lonHostID'}) { |
|
my $peerfile="$perlvar{'lonSockDir'}/$server"; |
|
my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", |
|
Type => SOCK_STREAM, |
|
Timeout => 10) |
|
or return "con_lost"; |
|
|
|
|
|
$answer = londtransaction($sclient, $cmd, 10); |
|
|
|
if ((!$answer) || ($@=~/timeout/)) { $answer="con_lost"; } |
|
$SIG{ALRM}='DEFAULT'; |
|
$SIG{__DIE__}=\&catchexception; |
|
} else { $answer='self_reply'; } |
|
return $answer; |
|
} |
|
|
|
# --------------------------------------------------------------------- Logging |
|
|
|
sub logthis { |
|
my $message=shift; |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
my $fh=IO::File->new(">>$execdir/logs/lonc.log"); |
|
my $now=time; |
|
my $local=localtime($now); |
|
$lastlog=$local.': '.$message; |
|
print $fh "$local ($$) [$conserver] [$status]: $message\n"; |
|
} |
|
|
|
#-------------------------------------- londtransaction: |
|
# |
|
# Performs a transaction with lond with timeout support. |
|
# result = londtransaction(socket,request,timeout) |
|
# |
|
sub londtransaction { |
|
my ($socket, $request, $tmo) = @_; |
|
|
|
if($DEBUG) { |
|
&logthis("londtransaction request: $request"); |
|
} |
|
|
|
# Set the signal handlers: ALRM for timeout and disble the others. |
|
|
|
$SIG{ALRM} = sub { die "timeout" }; |
|
$SIG{__DIE__} = 'DEFAULT'; |
|
|
|
# Disable all but alarm so that only that can interupt the |
|
# send /receive. |
|
# |
|
my $sigset = POSIX::SigSet->new(QUIT, USR1, HUP, INT, TERM); |
|
my $priorsigs = POSIX::SigSet->new; |
|
unless (defined sigprocmask(SIG_BLOCK, $sigset, $priorsigs)) { |
|
&logthis("<font color=red> CRITICAL -- londtransaction ". |
|
"failed to block signals </font>"); |
|
die "could not block signals in londtransaction"; |
|
} |
|
$answer = ''; |
|
# |
|
# Send request to lond. |
|
# |
|
eval { |
|
alarm($tmo); |
|
print $socket "$request\n"; |
|
alarm(0); |
|
}; |
|
# If request didn't timeout, try for the response. |
|
# |
|
|
|
if ($@!~/timeout/) { |
|
eval { |
|
alarm($tmo); |
|
$answer = <$socket>; |
|
if($DEBUG) { |
|
&logthis("Received $answer in londtransaction"); |
|
} |
|
alarm(0); |
|
}; |
|
} else { |
|
if($DEBUG) { |
|
&logthis("Timeout on send in londtransaction"); |
|
} |
|
} |
|
if( ($@ =~ /timeout/) && ($DEBUG)) { |
|
&logthis("Timeout on receive in londtransaction"); |
|
} |
|
# |
|
# Restore the initial sigmask set. |
|
# |
|
unless (defined sigprocmask(SIG_UNBLOCK, $priorsigs)) { |
|
&logthis("<font color=red> CRITICAL -- londtransaction ". |
|
"failed to re-enable signal processing. </font>"); |
|
die "londtransaction failed to re-enable signals"; |
|
} |
|
# |
|
# go back to the prior handler set. |
|
# |
|
$SIG{ALRM} = 'DEFAULT'; |
|
$SIG{__DIE__} = \&cathcexception; |
|
|
|
# chomp $answer; |
|
if ($DEBUG) { |
|
&logthis("Returning $answer in londtransaction"); |
|
} |
|
return $answer; |
|
|
|
} |
|
|
|
sub logperm { |
|
my $message=shift; |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
my $now=time; |
|
my $local=localtime($now); |
|
my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log"); |
|
print $fh "$now:$message:$local\n"; |
|
} |
|
# ------------------------------------------------------------------ Log status |
|
|
|
sub logstatus { |
|
my $docdir=$perlvar{'lonDocRoot'}; |
|
my $fh=IO::File->new(">>$docdir/lon-status/loncstatus.txt"); |
|
print $fh $$."\t".$conserver."\t".$status."\t".$lastlog."\n"; |
|
} |
|
|
|
sub initnewstatus { |
|
my $docdir=$perlvar{'lonDocRoot'}; |
|
my $fh=IO::File->new(">$docdir/lon-status/loncstatus.txt"); |
|
my $now=time; |
|
my $local=localtime($now); |
|
print $fh "LONC status $local - parent $$\n\n"; |
|
} |
|
|
|
# -------------------------------------------------------------- Status setting |
|
|
|
sub status { |
|
my $what=shift; |
|
my $now=time; |
|
my $local=localtime($now); |
|
$status=$local.': '.$what; |
|
} |
|
|
|
|
|
|
|
# ----------------------------------- POD (plain old documentation, CPAN style) |
|
|
|
=head1 NAME |
|
|
|
lonc - LON TCP-MySQL-Server Daemon for handling database requests. |
|
|
|
=head1 SYNOPSIS |
|
|
|
Usage: B<lonc> |
|
|
|
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<lonc> from the command-line. (In other words, |
|
DO NOT START B<lonc> YOURSELF.) |
|
|
|
=head1 DESCRIPTION |
|
|
|
Provides persistent TCP connections to the other servers in the network |
|
through multiplexed domain sockets |
|
|
|
B<lonc> 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. |
|
|
|
After forking off the children, B<lonc> the B<parent> |
|
executes a main loop which simply waits for processes to exit. |
|
As a process exits, a new process managing a link to the same |
|
peer as the exiting process is created. |
|
|
|
B<logs/lonc.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/lonc.pid> |
|
|
|
This is the process id number of the parent B<lonc> 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<lonc> 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<lonc> parent I<PID>, |
|
This kills all the children, and then the parent. |
|
The B<lonc.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<lonc> parent I<PID>, |
|
SIGUSR1 is sent to all the children, and the status of |
|
each connection is logged. |
|
|
|
|
|
=back |
|
|
|
=head1 PREREQUISITES |
|
|
|
POSIX |
|
IO::Socket |
|
IO::Select |
|
IO::File |
|
Socket |
|
Fcntl |
|
Tie::RefHash |
|
Crypt::IDEA |
|
|
|
=head1 COREQUISITES |
|
|
|
=head1 OSNAMES |
|
|
|
linux |
|
|
|
=head1 SCRIPT CATEGORIES |
|
|
|
Server/Process |
|
|
|
=cut |