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 * -------------------------------------------------------------------- *
15 * $Tag:: 0.2.1-FINAL $ *
17 * Needs to be in all Files and every File needs "svn propset *
18 * svn:keywords Date Revision" (autoprobset!) at least!!!!!! *
19 * -------------------------------------------------------------------- *
20 * Copyright (c) 2003 - 2009 by Roland Haeder *
21 * Copyright (c) 2009, 2010 by Mailer Developer Team *
22 * For more information visit: http://www.mxchange.org *
24 * This program is free software; you can redistribute it and/or modify *
25 * it under the terms of the GNU General Public License as published by *
26 * the Free Software Foundation; either version 2 of the License, or *
27 * (at your option) any later version. *
29 * This program is distributed in the hope that it will be useful, *
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
32 * GNU General Public License for more details. *
34 * You should have received a copy of the GNU General Public License *
35 * along with this program; if not, write to the Free Software *
36 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
38 ************************************************************************/
40 // Some security stuff...
41 if (!defined('__SECURITY')) {
45 // Resolver class for cached hostname -> IP address resolving
46 class HostnameResolver {
47 // Resolve hostname -> IP address
48 function resolveHostname ($hostname) {
49 // If sql_patches is not at least 0.7.0, abort here and return the hostname (gethostbyname() may return something unwanted)
50 if (!isExtensionInstalledAndNewer('sql_patches', '0.7.0')) {
55 // Prepare hostname, look for the ':port' part
56 $hostArray = explode(':', $hostname, 2);
57 $hostname = strtolower($hostArray[0]);
59 // Is the hostname an IP address?
60 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)) {
61 // Then we don't need to look it up
62 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Hostname %s is an IP address. No need to lookup.", $hostname));
67 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Begin lookup: %s", $hostname));
70 // Search for hostname in cache
71 $result = SQL_QUERY_ESC("SELECT `ip` FROM `{?_MYSQL_PREFIX?}_dns_cache` WHERE `hostname`='%s' LIMIT 1",
72 array($hostname), __METHOD__, __LINE__);
74 // Does an entry exist?
75 if (SQL_NUMROWS($result) == 1) {
76 // Then load the hostname
77 list($ip) = SQL_FETCHROW($result);
80 incrementStatsEntry('dns_cache_hits');
82 // Set fetched IP number as return value
84 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cache used: %s->%s", $hostname, $ip));
87 $ip = gethostbyname($hostname);
90 incrementStatsEntry('dns_lookup_hits');
92 // Is it an IP address?
93 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, $matches))) {
94 // Seems to be an IP! Now check deeper...
95 if (($matches[0] == $ip) && ($matches[1] >= 0) && ($matches[1] <= 255) && ($matches[2] >= 0) && ($matches[2] <= 255) && ($matches[3] >= 0) && ($matches[3] <= 255) && ($matches[4] > 0) && ($matches[4] < 255)) {
96 // We also cache IP addresses
97 SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES('%s', '%s', NOW())",
98 array($ip, $hostname), __METHOD__, __LINE__);
100 // Set return value to $ip
101 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP detected, cache entry written: %s->%s", $hostname, $ip));
103 // Network address or broadcast address found
104 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP %s is possibly a network or broadcast address.", $ip));
106 } elseif ($ip == $hostname) {
107 // Nothing found, maybe invalid!
108 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cannot lookup: %s", $hostname));
111 SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES('%s', '%s', NOW())",
112 array($ip, $hostname), __METHOD__, __LINE__);
114 // Set return value to $ip
116 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Lookup successfull, cache entry written: %s->%s", $hostname, $ip));
121 SQL_FREERESULT($result);
123 // Return IP number (let's hope it!
128 function purgeEntries() {
129 // SQL for cleaning up
130 SQL_QUERY('DELETE LOW_PRIORITY FROM `{?_MYSQL_PREFIX?}_dns_cache` WHERE UNIX_TIMESTAMP(`added`) < (UNIX_TIMESTAMP() - {?dns_cache_timeout?})',
131 __METHOD__, __LINE__);