application/hub/main/tools/class_HubTools.php

   1 <?php
   2 /**
   3  * This class contains static helper functions for our hub
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2011 Hub Developer Team
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.ship-simu.org
  10  *
  11  * This program is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  23  */
  24 class HubTools extends BaseHubSystem {
  25         // Constants for exceptions
  26         const EXCEPTION_SESSION_ID_IS_INVALID = 0x200;
  27         const EXCEPTION_HOSTNAME_NOT_FOUND    = 0x201;
  28
  29         /**
  30          * Cache for session ids
  31          */
  32         private $sessionIdCache = array();
  33
  34         /**
  35          * Length for session id (should be 32+salt_length
  36          */
  37         private $sessionIdLength = 0;
  38
  39         /**
  40          * Self instance
  41          */
  42         private static $selfInstance = NULL;
  43
  44         /**
  45          * Protected constructor
  46          *
  47          * @return      void
  48          */
  49         protected function __construct () {
  50                 // Call parent constructor
  51                 parent::__construct(__CLASS__);
  52
  53                 // Init salt length
  54                 $this->sessionIdLength = 32 + $this->getConfigInstance()->getConfigEntry('salt_length');
  55         }
  56
  57         /**
  58          * Singleton getter for self instance
  59          *
  60          * @retuen      $selfInstance   An instance of this class
  61          */
  62         public static final function getSelfInstance () {
  63                 // Is the instance set
  64                 if (is_null(self::$selfInstance)) {
  65                         // Then set it
  66                         self::$selfInstance = new HubTools();
  67                 } // END - if
  68
  69                 // Return own instance
  70                 return self::$selfInstance;
  71         }
  72
  73         /**
  74          * Getter for session id length
  75          *
  76          * @return      $sessionIdLength        Length of session ids
  77          */
  78         protected final function getSessionIdLength () {
  79                 return $this->sessionIdLength;
  80         }
  81
  82         /**
  83          * Resolves a session id into an ip:port combination
  84          *
  85          * @param       $sessionId      A valid session id
  86          * @return      $recipient      Recipient as ip:port combination
  87          */
  88         protected function resolveIpPortBySessionId ($sessionId) {
  89                 // Get a wrapper instance
  90                 $wrapperInstance = DatabaseWrapperFactory::createWrapperByConfiguredName('node_list_db_wrapper_class');
  91
  92                 // And ask it for the session id
  93                 $recipient = $wrapperInstance->resolveIpPortBySessionId($sessionId);
  94
  95                 // Is the recipient invalid?
  96                 if ($recipient == 'invalid:invalid') {
  97                         // Get the instance, this might throw a NPE
  98                         $nodeInstance = Registry::getRegistry()->getInstance('node');
  99
 100                         // Is the session id the same?
 101                         if ($nodeInstance->getSessionId() == $sessionId) {
 102                                 // Then get the ip:port from it, assume TCP by default
 103                                 $recipient = self::determineOwnExternalIp() . ':' . $nodeInstance->getConfigInstance()->getConfigEntry('node_tcp_listen_port');
 104                         } // END - if
 105                 } // END - if
 106
 107                 // Return result
 108                 return $recipient;
 109         }
 110
 111         /**
 112          * Resolves given session id into an ip:port combination, if ip:port is set, it won't be translated
 113          *
 114          * @param       $sessionId      Session id or ip:port combination
 115          * @return      $recipient      Recipient as ip:port combination
 116          * @throws      InvalidSessionIdException       If the provided session id is invalid (and no ip:port combination)
 117          * @throws      NoValidHostnameException        If the provided hostname cannot be resolved into an IP address
 118          */
 119         public static function resolveSessionId ($sessionId) {
 120                 // Get an own instance
 121                 $selfInstance = self::getSelfInstance();
 122
 123                 // Default is direct ip:port
 124                 $recipient = $sessionId;
 125
 126                 // Does it match a direct ip:port? (hint: see www.regexlib.com for the regular expression)
 127                 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])):([0-9]{3,5})/', $sessionId)) {
 128                         // Direct ip:port found
 129                         $selfInstance->debugOutput('HUB-TOOLS: Direct ip:port ' . $sessionId . ' detected.');
 130                 } elseif (isset($selfInstance->sessionIdCache[$sessionId])) {
 131                         // Debug message
 132                         $selfInstance->debugOutput('HUB-TOOLS: Using entry from sessionIdCache[] array.');
 133
 134                         // Found in cache!
 135                         $recipient = $selfInstance->sessionIdCache[$sessionId];
 136                 } elseif (preg_match('/([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}:([0-9]{3,5})/', $sessionId)) {
 137                         // Hostname:port found
 138                         $hostnameArray = explode(':', $sessionId);
 139
 140                         // Try to resolve it and add port again
 141                         // @TODO We may want to encapsulate this PHP call into an own class
 142                         $recipient = gethostbyname($hostnameArray[0]) . ':' . $hostnameArray[1];
 143
 144                         // Is it valid?
 145                         if ($recipient == $sessionId) {
 146                                 // Resolving hostname->IP failed!
 147                                 throw new NoValidHostnameException($hostnameArray, self::EXCEPTION_HOSTNAME_NOT_FOUND);
 148                         } // END - if
 149                 } elseif (preg_match('/([a-f0-9]{' . $selfInstance->getSessionIdLength() . '})/', $sessionId)) {
 150                         // Debug message
 151                         $selfInstance->debugOutput('HUB-TOOLS: Using internal session id resolver.');
 152
 153                         // Resolve session id into a ip:port combination
 154                         $recipient = $selfInstance->resolveIpPortBySessionId($sessionId);
 155                 } else {
 156                         // Invalid session id
 157                         throw new InvalidSessionIdException($sessionId, self::EXCEPTION_SESSION_ID_IS_INVALID);
 158                 }
 159
 160                 // Output message
 161                 $selfInstance->debugOutput('HUB-TOOLS: Session id ' . $sessionId . ' resolved to ' . $recipient);
 162
 163                 // Return it
 164                 return $recipient;
 165         }
 166
 167         /**
 168          * Determine IP or 'external_ip' if set
 169          *
 170          * @return      $ip             The determined external ip of this node
 171          */
 172         public static function determineOwnExternalIp () {
 173                 // Is the external_ip config entry set?
 174                 if (FrameworkConfiguration::getSelfInstance()->getConfigEntry('external_ip') != '') {
 175                         // Use it as external ip
 176                         $ip = FrameworkConfiguration::getSelfInstance()->getConfigEntry('external_ip');
 177                 } else {
 178                         // Determine own external ip by connecting to my (coder) server at 188.138.90.169
 179                         $ip = ConsoleTools::determineExternalIp();
 180                 }
 181
 182                 // Return it
 183                 return $ip;
 184         }
 185 }
 186
 187 // [EOF]
 188 ?>