2 /************************************************************************
3 * Mailer v0.2.1-FINAL Start: 03/05/2010 *
4 * =================== Last change: 03/05/2010 *
6 * -------------------------------------------------------------------- *
7 * File : resolver.class.php *
8 * -------------------------------------------------------------------- *
9 * Short description : Resolver class *
10 * -------------------------------------------------------------------- *
11 * Kurzbeschreibung : Resolver-Klasse *
12 * -------------------------------------------------------------------- *
13 * Copyright (c) 2003 - 2009 by Roland Haeder *
14 * Copyright (c) 2009 - 2013 by Mailer Developer Team *
15 * For more information visit: http://mxchange.org *
17 * This program is free software; you can redistribute it and/or modify *
18 * it under the terms of the GNU General Public License as published by *
19 * the Free Software Foundation; either version 2 of the License, or *
20 * (at your option) any later version. *
22 * This program is distributed in the hope that it will be useful, *
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
25 * GNU General Public License for more details. *
27 * You should have received a copy of the GNU General Public License *
28 * along with this program; if not, write to the Free Software *
29 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
31 ************************************************************************/
33 // Some security stuff...
34 if (!defined('__SECURITY')) {
38 // Resolver class for cached hostname -> IP address resolving
39 class HostnameResolver {
40 // Resolve hostname -> IP address
41 function resolveHostname ($hostname) {
42 // If ext-sql_patches is not at least 0.7.0, abort here and return the hostname (gethostbyname() may return something unwanted)
43 if (!isExtensionInstalledAndNewer('sql_patches', '0.7.0')) {
48 // Prepare hostname, look for the ':port' part
49 $hostArray = explode(':', $hostname, 2);
50 $hostname = strtolower($hostArray[0]);
52 // Is the hostname an IP address?
53 if (preg_match('/(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])/', $hostname, $matches)) {
54 // Then we don't need to look it up
55 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Hostname %s is an IP address. No need to lookup.", $hostname));
60 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Begin lookup: %s", $hostname));
63 // Search for hostname in cache
64 $result = sqlQueryEscaped("SELECT `ip` FROM `{?_MYSQL_PREFIX?}_dns_cache` WHERE `hostname`='%s' LIMIT 1",
67 ), __METHOD__, __LINE__
70 // Does an entry exist?
71 if (sqlNumRows($result) == 1) {
72 // Then load the hostname
73 list($ip) = sqlFetchRow($result);
76 incrementStatsEntry('dns_cache_hits');
78 // Set fetched IP number as return value
80 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cache used: %s->%s", $hostname, $ip));
83 $ip = gethostbyname($hostname);
84 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, 'ip=' . $ip . ',hostname=' . $hostname . ' - RESOLVED!');
87 incrementStatsEntry('dns_lookup_hits');
89 // Is it an IP address?
90 if (($ip != $hostname) && (preg_match('/(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])/', $ip, $matches))) {
91 // Seems to be an IP! Now check deeper...
92 if (($matches[0] == $ip) && ($matches[1] >= 0) && ($matches[1] <= 255) && ($matches[2] >= 0) && ($matches[2] <= 255) && ($matches[3] >= 0) && ($matches[3] <= 255) && ($matches[4] > 0) && ($matches[4] < 255)) {
93 // We also cache IP addresses
94 sqlQueryEscaped("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES ('%s', '%s', NOW())",
98 ), __METHOD__, __LINE__
101 // Set return value to $ip
102 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP detected, cache entry written: %s->%s", $hostname, $ip));
105 // Network address or broadcast address found
106 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP %s is possibly a network or broadcast address.", $ip));
108 } elseif ($ip == $hostname) {
109 // Nothing found, maybe invalid!
110 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cannot lookup: %s", $hostname));
113 sqlQueryEscaped("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES ('%s', '%s', NOW())",
117 ), __METHOD__, __LINE__
120 // Set return value to $ip
122 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Lookup successfull, cache entry written: %s->%s", $hostname, $ip));
127 sqlFreeResult($result);
129 // Return IP number (let's hope it)
134 function purgeEntries() {
135 // SQL for cleaning up
136 sqlQuery('DELETE LOW_PRIORITY FROM `{?_MYSQL_PREFIX?}_dns_cache` WHERE (UNIX_TIMESTAMP() - UNIX_TIMESTAMP(`added`) >= {?dns_cache_timeout?})',
137 __METHOD__, __LINE__);