inc/classes/resolver.class.php

   1 <?php
   2 /************************************************************************
   3  * Mailer v0.2.1-FINAL                                Start: 03/05/2010 *
   4  * ===================                          Last change: 03/05/2010 *
   5  *                                                                      *
   6  * -------------------------------------------------------------------- *
   7  * File              : resolver.class.php                               *
   8  * -------------------------------------------------------------------- *
   9  * Short description : Resolver class                                   *
  10  * -------------------------------------------------------------------- *
  11  * Kurzbeschreibung  : Resolver-Klasse                                  *
  12  * -------------------------------------------------------------------- *
  13  * $Revision::                                                        $ *
  14  * $Date::                                                            $ *
  15  * $Tag:: 0.2.1-FINAL                                                 $ *
  16  * $Author::                                                          $ *
  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                  *
  23  *                                                                      *
  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.                                  *
  28  *                                                                      *
  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.                         *
  33  *                                                                      *
  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,               *
  37  * MA  02110-1301  USA                                                  *
  38  ************************************************************************/
  39
  40 // Some security stuff...
  41 if (!defined('__SECURITY')) {
  42         die();
  43 } // END - if
  44
  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')) {
  51                         // Abort here
  52                         return $hostname;
  53                 } // END - if
  54
  55                 // Prepare hostname, look for the ':port' part
  56                 $hostArray = explode(':', $hostname, 2);
  57                 $hostname = strtolower($hostArray[0]);
  58
  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));
  63                         return $hostname;
  64                 } // END - if
  65
  66                 // Log entry
  67                 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Begin lookup: %s", $hostname));
  68                 $ret = '0.0.0.0';
  69
  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__);
  73
  74                 // Does an entry exist?
  75                 if (SQL_NUMROWS($result) == 1) {
  76                         // Then load the hostname
  77                         list($ip) = SQL_FETCHROW($result);
  78
  79                         // Count cache hit
  80                         incrementStatsEntry('dns_cache_hits');
  81
  82                         // Set fetched IP number as return value
  83                         $ret = $ip;
  84                         //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cache used: %s->%s", $hostname, $ip));
  85                 } else {
  86                         // Get IP address
  87                         $ip = gethostbyname($hostname);
  88
  89                         // Count lookup hit
  90                         incrementStatsEntry('dns_lookup_hits');
  91
  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__);
  99
 100                                         // Set return value to $ip
 101                                         //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP detected, cache entry written: %s->%s", $hostname, $ip));
 102                                 } else {
 103                                         // Network address or broadcast address found
 104                                         //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP %s is possibly a network or broadcast address.", $ip));
 105                                 }
 106                         } elseif ($ip == $hostname) {
 107                                 // Nothing found, maybe invalid!
 108                                 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cannot lookup: %s", $hostname));
 109                         } else {
 110                                 // Put entry in DB
 111                                 SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES('%s', '%s', NOW())",
 112                                         array($ip, $hostname), __METHOD__, __LINE__);
 113
 114                                 // Set return value to $ip
 115                                 $ret = $ip;
 116                                 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Lookup successfull, cache entry written: %s->%s", $hostname, $ip));
 117                         }
 118                 }
 119
 120                 // Free result
 121                 SQL_FREERESULT($result);
 122
 123                 // Return IP number (let's hope it!
 124                 return $ret;
 125         }
 126
 127         // Purge old entries
 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__);
 132         }
 133 }
 134
 135 // [EOF]
 136 ?>