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 :port
  56                 $hostArray = explode(':', strtolower($hostname), 2);
  57                 $hostname = $hostArray[0];
  58
  59                 // Log entry
  60                 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Begin lookup: %s", $hostname));
  61                 $ret = '0.0.0.0';
  62
  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__);
  66
  67                 // Does an entry exist?
  68                 if (SQL_NUMROWS($result) == 1) {
  69                         // Then load the hostname
  70                         list($ip) = SQL_FETCHROW($result);
  71
  72                         // Count cache hit
  73                         incrementStatsEntry('dns_cache_hits');
  74
  75                         // Set fetched IP number as return value
  76                         $ret = $ip;
  77                         //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cache used: %s->%s", $hostname, $ip));
  78                 } else {
  79                         // Get IP address
  80                         $ip = gethostbyname($hostname);
  81
  82                         // Count lookup hit
  83                         incrementStatsEntry('dns_lookup_hits');
  84
  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__);
  92
  93                                         // Set return value to $ip
  94                                         //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP detected, cache entry written: %s->%s", $hostname, $ip));
  95                                 } else {
  96                                         // Network address or broadcast address found
  97                                         //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("IP %s is possibly a network or broadcast address.", $ip));
  98                                 }
  99                         } elseif ($ip == $hostname) {
 100                                 // Nothing found, maybe invalid!
 101                                 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Cannot lookup: %s", $hostname));
 102                         } else {
 103                                 // Put entry in DB
 104                                 SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_dns_cache` (`ip`, `hostname`, `added`) VALUES('%s', '%s', NOW())",
 105                                         array($ip, strtolower($hostname)), __METHOD__, __LINE__);
 106
 107                                 // Set return value to $ip
 108                                 $ret = $ip;
 109                                 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("Lookup successfull, cache entry written: %s->%s", $hostname, $ip));
 110                         }
 111                 }
 112
 113                 // Free result
 114                 SQL_FREERESULT($result);
 115
 116                 // Return IP number (let's hope it!
 117                 return $ret;
 118         }
 119
 120         // Purge old entries
 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() - {%config:dns_cache_timeout%})",
 124                         __METHOD__, __LINE__);
 125         }
 126 }
 127
 128 // [EOF]
 129 ?>