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 :port
56 $hostArray = explode(':', strtolower($hostname), 2);
57 $hostname = $hostArray[0];
60 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Begin lookup: %s", $hostname));
63 // Search for hostname in cache
64 $result = SQL_QUERY_ESC("SELECT `ip` FROM `{?_MYSQL_PREFIX?}_dns_cache` WHERE `hostname`='%s' LIMIT 1",
65 array(strtolower($hostname)), __METHOD__, __LINE__);
67 // Does an entry exist?
68 if (SQL_NUMROWS($result) == 1) {
69 // Then load the hostname
70 list($ip) = SQL_FETCHROW($result);
73 incrementStatsEntry('dns_cache_hits');
75 // Set fetched IP number as return value
77 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cache used: %s->%s", $hostname, $ip));
80 $ip = gethostbyname($hostname);
83 incrementStatsEntry('dns_lookup_hits');
85 // Is it an IP address?
86 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, $matches)) {
87 // Seems to be an IP! Now check deeper...
88 if (($matches[0] == $ip) && ($matches[1] >= 0) && ($matches[1] <= 255) && ($matches[2] >= 0) && ($matches[2] <= 255) && ($matches[3] >= 0) && ($matches[3] <= 255) && ($matches[4] >= 0) && ($matches[4] <= 255)) {
89 // We also cache IP addresses
90 SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES('%s', '%s', NOW())",
91 array($ip, strtolower($hostname)), __METHOD__, __LINE__);
93 // Set return value to $ip
94 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP detected, cache entry written: %s->%s", $hostname, $ip));
96 // Network address or broadcast address found
97 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP %s is possibly a network or broadcast address.", $ip));
99 } elseif ($ip == $hostname) {
100 // Nothing found, maybe invalid!
101 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cannot lookup: %s", $hostname));
104 SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES('%s', '%s', NOW())",
105 array($ip, strtolower($hostname)), __METHOD__, __LINE__);
107 // Set return value to $ip
109 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Lookup successfull, cache entry written: %s->%s", $hostname, $ip));
114 SQL_FREERESULT($result);
116 // Return IP number (let's hope it!
121 function purgeEntries() {
122 // SQL for cleaning up
123 SQL_QUERY("DELETE LOW_PRIORITY FROM `{?_MYSQL_PREFIX?}_dns_cache` WHERE UNIX_TIMESTAMP(`added`) < (UNIX_TIMESTAMP() - {?dns_cache_timeout?})",
124 __METHOD__, __LINE__);