#! /usr/local/bin/php
<?php
/*
 * Copyright (C) 2003-2004 Pawel Foremski <pjf@gna.org>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 ***
 *
 * $Id: helodnscheck.php,v 1.1 2004/07/05 18:27:21 pavcio Exp $
 *
 */

error_reporting(0);

if ($_ENV['NOHELODNSCHECK'] !== NULL ||         /* plugin disabled */
    !$_ENV['SMTPHELOHOST'] ||                   /* no HELO host */
    $_ENV['SMTPHELOHOST'] == 'unknown') exit(); /* HELO with no argument */

/* check DNS record */
$dnsrec = dns_get_record($_ENV['SMTPHELOHOST'], DNS_A); /* TODO: use PEAR */

if (!is_array($dnsrec) || count($dnsrec) ) exit(); /* query failed or domain exists */

fwrite(STDERR, "non existing HELO greeting domain: $_ENV[SMTPHELOHOST]\n");
exit("E559 sorry, your HELO/EHLO greeting must resolve (#5.7.1)\n");

?>