#!/usr/bin/perl
# The LearningOnline Network
# lond "LON Daemon" Server (port "LOND" 5663)
#
# $Id: lond,v 1.82 2002/06/18 19:39:13 www 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,
# 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
# 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
# 02/05 Guy Albertelli
# 02/07 Scott Harrison
# 02/12 Gerd Kortemeyer
# 02/19 Matthew Hall
# 02/25 Gerd Kortemeyer
# 05/11 Scott Harrison
###
# based on "Perl Cookbook" ISBN 1-56592-243-3
# preforker - server who forks first
# runs as a daemon
# HUPs
# uses IDEA encryption
use lib '/home/httpd/lib/perl/';
use LONCAPA::Configuration;
use IO::Socket;
use IO::File;
use Apache::File;
use Symbol;
use POSIX;
use Crypt::IDEA;
use LWP::UserAgent();
use GDBM_File;
use Authen::Krb4;
use lib '/home/httpd/lib/perl/';
use localauth;
my $DEBUG = 0; # Non zero to enable debug log entries.
my $status='';
my $lastlog='';
# grabs exception and records it to log before exiting
sub catchexception {
my ($error)=@_;
$SIG{'QUIT'}='DEFAULT';
$SIG{__DIE__}='DEFAULT';
&logthis("<font color=red>CRITICAL: "
."ABNORMAL EXIT. Child $$ for server $wasserver died through "
."a crash with this error msg->[$error]</font>");
&logthis('Famous last words: '.$status.' - '.$lastlog);
if ($client) { print $client "error: $error\n"; }
$server->close();
die($error);
}
sub timeout {
&logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
&catchexception('Timeout');
}
# -------------------------------- Set signal handlers to record abnormal exits
$SIG{'QUIT'}=\&catchexception;
$SIG{__DIE__}=\&catchexception;
# ---------------------------------- Read loncapa_apache.conf and loncapa.conf
&status("Read loncapa_apache.conf and loncapa.conf");
my $perlvarref=LONCAPA::Configuration::read_conf('loncapa_apache.conf',
'loncapa.conf');
my %perlvar=%{$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";
system("echo 'User ID mismatch. lond must be run as user www.' |\
mailto $emailto -s '$subj' > /dev/null");
exit 1;
}
# --------------------------------------------- Check if other instance running
my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
if (-e $pidfile) {
my $lfh=IO::File->new("$pidfile");
my $pide=<$lfh>;
chomp($pide);
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); $ip=~s/\D+$//;
$hostid{$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'},
Type => SOCK_STREAM,
Proto => 'tcp',
Reuse => 1,
Listen => 10 )
or die "making socket: $@\n";
# --------------------------------------------------------- Do global variables
# global variables
$MAX_CLIENTS_PER_CHILD = 50; # number of clients each child should
# process
%children = (); # keys are current child process IDs
$children = 0; # current number of children
sub REAPER { # takes care of dead children
$SIG{CHLD} = \&REAPER;
my $pid = wait;
if (defined($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("$execdir/logs/lond.pid");
&logthis("<font color=red>CRITICAL: Shutting down</font>");
exit; # clean up with dignity
}
sub HUPSMAN { # signal handler for SIGHUP
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
kill 'INT' => keys %children;
&logthis("Free socket: ".shutdown($server,2)); # free up socket
&logthis("<font color=red>CRITICAL: Restarting</font>");
unlink("$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($$.' is dead');
}
}
sleep 5;
foreach (sort keys %children) {
unless (-e "$docdir/lon-status/londchld/$_.txt") {
&logthis('Child '.$_.' did not respond');
kill 9 => $_;
$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
$subj="LON: $perlvar{'lonHostID'} killed lond process $_";
my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
$execdir=$perlvar{'lonDaemons'};
$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`
}
}
}
# --------------------------------------------------------------------- Logging
sub logthis {
my $message=shift;
my $execdir=$perlvar{'lonDaemons'};
my $fh=IO::File->new(">>$execdir/logs/lond.log");
my $now=time;
my $local=localtime($now);
$lastlog=$local.': '.$message;
print $fh "$local ($$): $message\n";
}
# ------------------------- Conditional log if $DEBUG true.
sub Debug {
my $message = shift;
if($DEBUG) {
&logthis($message);
}
}
# ------------------------------------------------------------------ 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
sub escape {
my $str=shift;
$str =~ s/(\W)/"%".unpack('H2',$1)/eg;
return $str;
}
# ----------------------------------------------------- Un-Escape Special Chars
sub unescape {
my $str=shift;
$str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
return $str;
}
# ----------------------------------------------------------- Send USR1 to lonc
sub reconlonc {
my $peerfile=shift;
&logthis("Trying to reconnect for $peerfile");
my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
if (my $fh=IO::File->new("$loncfile")) {
my $loncpid=<$fh>;
chomp($loncpid);
if (kill 0 => $loncpid) {
&logthis("lonc at pid $loncpid responding, sending USR1");
kill USR1 => $loncpid;
sleep 5;
if (-e "$peerfile") { return; }
&logthis("$peerfile still not there, give it another try");
sleep 10;
if (-e "$peerfile") { return; }
&logthis(
"<font color=blue>WARNING: $peerfile still not there, giving up</font>");
} else {
&logthis(
"<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>');
}
}
# -------------------------------------------------- Non-critical communication
sub subreply {
my ($cmd,$server)=@_;
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"; }
return $answer;
}
sub reply {
my ($cmd,$server)=@_;
my $answer;
if ($server ne $perlvar{'lonHostID'}) {
$answer=subreply($cmd,$server);
if ($answer eq 'con_lost') {
$answer=subreply("ping",$server);
if ($answer ne $server) {
&logthis("sub reply: answer != server");
&reconlonc("$perlvar{'lonSockDir'}/$server");
}
$answer=subreply($cmd,$server);
}
} else {
$answer='self_reply';
}
return $answer;
}
# -------------------------------------------------------------- Talk to lonsql
sub sqlreply {
my ($cmd)=@_;
my $answer=subsqlreply($cmd);
if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
return $answer;
}
sub subsqlreply {
my ($cmd)=@_;
my $unixsock="mysqlsock";
my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
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"; }
return $answer;
}
# -------------------------------------------- Return path to profile directory
sub propath {
my ($udom,$uname)=@_;
$udom=~s/\W//g;
$uname=~s/\W//g;
my $subdir=$uname.'__';
$subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
return $proname;
}
# --------------------------------------- Is this the home server of an author?
sub ishome {
my $author=shift;
$author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
my ($udom,$uname)=split(/\//,$author);
my $proname=propath($udom,$uname);
if (-e $proname) {
return 'owner';
} else {
return 'not_owner';
}
}
# ======================================================= Continue main program
# ---------------------------------------------------- Fork once and dissociate
$fpid=fork;
exit if $fpid;
die "Couldn't fork: $!" unless defined ($fpid);
POSIX::setsid() or die "Can't start new session: $!";
# ------------------------------------------------------- Write our PID on disk
$execdir=$perlvar{'lonDaemons'};
open (PIDSAVE,">$execdir/logs/lond.pid");
print PIDSAVE "$$\n";
close(PIDSAVE);
&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
&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
}
}
sub make_new_child {
my $pid;
my $cipher;
my $sigset;
&logthis("Attempting to start child");
# 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);
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;
$children++;
&status('Started child '.$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";
$tmpsnum=0;
# 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
# -----------------------------------------------------------------------------
# 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: Connection $i, $clientip ($hostid{$clientip})</font>"
);
&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) {
$clientok=1;
print $client "ok\n";
} else {
&logthis(
"<font color=blue>WARNING: $clientip did not reply challenge</font>");
&status('No challenge reply '.$clientip);
}
} 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>");
&status('Will listen to '.$hostid{$clientip});
# ------------------------------------------------------------ Process requests
while (my $userinput=<$client>) {
chomp($userinput);
Debug("Request = $userinput\n");
&status('Processing '.$hostid{$clientip}.': '.$userinput);
my $wasenc=0;
alarm(120);
# ------------------------------------------------------------ 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))
);
}
$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";
# ----------------------------------------------------------------- currentauth
} elsif ($userinput =~ /^currentauth/) {
if ($wasenc==1) {
my ($cmd,$udom,$uname)=split(/:/,$userinput);
my $result = GetAuthType($udom, $uname);
if($result eq "nouser") {
print $client "unknown_user\n";
}
else {
print $client "$result\n"
}
} else {
print $client "refused\n";
}
# ------------------------------------------------------------------------ auth
} elsif ($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];
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') {
$null=pack("C",0);
unless ($upass=~/$null/) {
$pwdcorrect=(
Authen::Krb4::get_pw_in_tkt($uname,"",
$contentpwd,'krbtgt',$contentpwd,1,
$upass) == 0);
} else { $pwdcorrect=0; }
} elsif ($howpwd eq 'localauth') {
$pwdcorrect=&localauth::localauth($uname,$upass,
$contentpwd);
}
if ($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);
&logthis("Trying to change password for $uname");
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"; }
&logthis("Result of password change for $uname: pwchange_success");
print $client "ok\n";
} else {
print $client "non_authorized\n";
}
} elsif ($howpwd eq 'unix') {
# Unix means we have to access /etc/password
# one way or another.
# First: Make sure the current password is
# correct
$contentpwd=(getpwnam($uname))[1];
my $pwdcorrect = "0";
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;
$pwdcorrect=!$?;
}
if ($pwdcorrect) {
my $execdir=$perlvar{'lonDaemons'};
my $pf = IO::File->new("|$execdir/lcpasswd");
print $pf "$uname\n$npass\n$npass\n";
close $pf;
my $result = ($?>0 ? 'pwchange_failure'
: 'ok');
&logthis("Result of password change for $uname: $result");
print $client "$result\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/) {
Debug("Make user received");
my $oldumask=umask(0077);
if ($wasenc==1) {
my
($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
&Debug("cmd =".$cmd." $udom =".$udom.
" uname=".$uname);
chomp($npass);
$npass=&unescape($npass);
my $proname=propath($udom,$uname);
my $passfilename="$proname/passwd";
&Debug("Password file created will be:".
$passfilename);
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)) {
$fperror="error:$!";
}
}
}
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);
{
&Debug("Creating internal auth");
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";
{
&Debug("Executing external: ".
$execpath);
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 $client "$fperror\n";
}
}
} else {
print $client "refused\n";
}
umask($oldumask);
# -------------------------------------------------------------- changeuserauth
} elsif ($userinput =~ /^changeuserauth/) {
&Debug("Changing authorization");
if ($wasenc==1) {
my
($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
chomp($npass);
&Debug("cmd = ".$cmd." domain= ".$udom.
"uname =".$uname." umode= ".$umode);
$npass=&unescape($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);
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 $now=time;
unless ($namespace=~/^nohist\_/) {
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/) {
&Debug("rolesput");
if ($wasenc==1) {
my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
=split(/:/,$userinput);
&Debug("cmd = ".$cmd." exedom= ".$exedom.
"user = ".$exeuser." udom=".$udom.
"what = ".$what);
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);
&ManagePermissions($key, $udom, $uname,
&GetAuthType( $udom,
$uname));
$hash{$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 $now=time;
unless ($namespace=~/^nohist\_/) {
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,$namespace,$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 $key (keys %hash) {
if (eval('$key=~/$regexp/')) {
$qresult.="$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 $now=time;
unless ($namespace=~/^nohist\_/) {
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,
$arg1,$arg2,$arg3)=split(/\:/,$userinput);
$query=~s/\n*$//g;
print $client "".
sqlreply("$hostid{$clientip}\&$query".
"\&$arg1"."\&$arg2"."\&$arg3")."\n";
# ------------------------------------------------------------------ queryreply
} elsif ($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";
}
# ---------------------------------------------------------------------- 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";
}
# -------------------------------------------------------------------------- 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";
# ------------------------------------------------------------------ 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 $client "unknown_cmd\n";
}
# -------------------------------------------------------------------- complete
alarm(0);
&status('Listening to '.$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>");
}
}
# =============================================================================
&logthis("<font color=red>CRITICAL: "
."Disconnect from $clientip ($hostid{$clientip})</font>");
# tidy up gracefully and finish
$server->close();
# 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 ManagePermissions
{
my $request = shift;
my $domain = shift;
my $user = shift;
my $authtype= shift;
# See if the request is of the form /$domain/_au
if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
my $execdir = $perlvar{'lonDaemons'};
my $userhome= "/home/$user" ;
Debug("system $execdir/lchtmldir $userhome $system $authtype");
system("$execdir/lchtmldir $userhome $user $authtype");
}
}
#
# GetAuthType - Determines the authorization type of a user in a domain.
# Returns the authorization type or nouser if there is no such user.
#
sub GetAuthType
{
my $domain = shift;
my $user = shift;
Debug("GetAuthType( $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') {
$availinfo = $contentpwd;
}
return "$authtype:$availinfo";
}
else {
Debug("Returning nouser");
return "nouser";
}
}
# ----------------------------------- 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 *
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 rolesput
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 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
=head1 COREQUISITES
=head1 OSNAMES
linux
=head1 SCRIPT CATEGORIES
Server/Process
=cut
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