#!/usr/bin/perl
# $Id: pperld.pl,v 1.2 2005/08/15 04:14:46 dodell Exp $
# Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
# a persistant perl process to amortize the overhead of many perl scripts
# listens on UNIX domain socket
# jmayer, hacked by thockin

$0 = "pperld";

# use common libs here
use lib qw( /usr/local/raqdevil/perl );
use lib qw( . );
use strict;		# turned on for development
use warnings;		# turned on for development
use IO::Socket;
use CCE;
use UnixAuth;
use Sauce::Util;
use Sauce::Service;
use FileHandle;
use DirHandle;
use POSIX;
use Fcntl;
use Data::Dumper;

# enable or disable debugging messages
my $debug = 0;

my $magic_file_name = "pperl.socket";
my $alarmtime = 300;

#
# main
#

# get out of the way
#chdir("/tmp");
setpgrp();
close(STDIN);
close(STDOUT);
open(STDIN, "</dev/null");
open(STDOUT, ">/dev/null");

# handle signals
$SIG{CHLD} = 'IGNORE'; # perl will auto-reap if SIGCHLD is IGNORE'd
$SIG{INT} = \&KILLHANDLE;
$SIG{TERM} = \&KILLHANDLE;
$SIG{QUIT} = \&KILLHANDLE;
$SIG{ALRM} = \&ALARM;

# get the UNIX domain socket
unlink($magic_file_name);
my $server = new IO::Socket::UNIX (
	Local => $magic_file_name,
	Type => SOCK_STREAM,
	Listen => 5) || die "$!";

# set the alarm 
alarm($alarmtime);

# loop for connections
my $pid;
while (my $connection = $server->accept()) {
	UnixAuth::verify($server);
	$debug && print STDERR "DEBUG $$: got a connection\n";

	# reset the alarm - 5 minutes
	alarm($alarmtime);

	$pid = fork();
	if ($pid == 0) {
		# child - become owned by init
		if (fork()) {
			exit(0);
		}
		$server->close();
		$SIG{CHLD} = 'DEFAULT';
		$SIG{INT} = 'DEFAULT';
		$SIG{TERM} = 'DEFAULT';
		$SIG{QUIT} = 'DEFAULT';
		$SIG{ALRM} = 'DEFAULT';
		alarm(0);
		handle_connection($connection);
		# never returns...
	} elsif ($pid < 0) {
		# error
		print STDERR "$0 fork: $!\n";
	}
	waitpid($pid, 0);
	$connection->close();
}
exit 0;

sub handle_connection
{
	my $con = shift;

	# detach
	setpgrp();

	# get peer credentials
	#my $cred = $con->sockopt(17);
	#my ($other_pid, $other_uid, $other_gid) = unpack("ISS",$cred);
	#$debug && print STDERR "DEBUG $$: connection uid=$other_uid\n";
  
	$|=1; # set output to non-buffered
	dup2($con->fileno, 0) || die "$!";
	dup2($con->fileno, 1) || die "$!";
	$con->close();

	# test access rights
	#if ($other_uid != $< && $other_uid != $> && $other_uid != 0) {
	#	print STDOUT "Access denied\n";
	#	exit(1);
	#}

	# Ignore initial '\0'
	getc(STDIN);
	my $fname = <STDIN>;
	chomp($fname);
	$debug && print STDERR "DEBUG $$: running $fname\n";

	# add the handler's dir to @INC
	my $dirname;
	{
		my @parts = split(/\/+/, $fname);
		pop(@parts);
		$dirname = join("/", @parts);
	}
	if (-d $dirname) { 
		push(@INC, $dirname); 
	}

	# run it
	$0 = "pperld $fname";
	my $r = do $fname;
	print STDERR "$@\n" if $@;
	print STDERR "$!\n" unless defined($r);
	$debug && print STDERR "DEBUG $$: done running\n";

	exit((defined($r) ? $r : 1));
}

sub KILLHANDLE {
	$debug && print STDERR "DEBUG $$: caught SIG(TERM,INT,QUIT)\n";
	unlink($magic_file_name);
	exit(0);
}

sub ALARM {
	$debug && print STDERR "DEBUG $$: caught SIGALRM\n";
	unlink($magic_file_name);
	exit(0);
}
# Copyright (c) 2003 Sun Microsystems, Inc. All  Rights Reserved.
# 
# Redistribution and use in source and binary forms, with or without 
# modification, are permitted provided that the following conditions are met:
# 
# -Redistribution of source code must retain the above copyright notice, 
# this list of conditions and the following disclaimer.
# 
# -Redistribution in binary form must reproduce the above copyright notice, 
# this list of conditions and the following disclaimer in the documentation  
# and/or other materials provided with the distribution.
# 
# Neither the name of Sun Microsystems, Inc. or the names of contributors may 
# be used to endorse or promote products derived from this software without 
# specific prior written permission.
# 
# This software is provided "AS IS," without a warranty of any kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
# 
# You acknowledge that  this software is not designed or intended for use in the design, construction, operation or maintenance of any nuclear facility.