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 - 2012 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                 // Get a DHT instance
  54                 $dhtInstance = DhtObjectFactory::createDhtObjectInstance('node');
  55
  56                 // Set it here
  57                 $this->setDhtInstance($dhtInstance);
  58
  59                 // Init salt length
  60                 $this->sessionIdLength = 32 + $this->getConfigInstance()->getConfigEntry('salt_length');
  61         }
  62
  63         /**
  64          * Singleton getter for self instance
  65          *
  66          * @retuen      $selfInstance   An instance of this class
  67          */
  68         public static final function getSelfInstance () {
  69                 // Is the instance set
  70                 if (is_null(self::$selfInstance)) {
  71                         // Then set it
  72                         self::$selfInstance = new HubTools();
  73                 } // END - if
  74
  75                 // Return own instance
  76                 return self::$selfInstance;
  77         }
  78
  79         /**
  80          * Getter for session id length
  81          *
  82          * @return      $sessionIdLength        Length of session ids
  83          */
  84         protected final function getSessionIdLength () {
  85                 return $this->sessionIdLength;
  86         }
  87
  88         /**
  89          * Resolves a session id into an ip:port combination. The opposite method
  90          * is resolveSessionIdByIpPort()
  91          *
  92          * @param       $sessionId                      A valid session id
  93          * @return      $recipientIpPort        Recipient as ip:port combination
  94          */
  95         protected function resolveIpPortBySessionId ($sessionId) {
  96                 // Init variable
  97                 $recipientIpPort = 'invalid:invalid';
  98
  99                 // And ask it for ip:port by given session id
 100                 $recipient = $this->getDhtInstance()->findNodeLocalBySessionId($sessionId);
 101
 102                 // Is the recipient valid?
 103                 if ((isset($recipient[NodeDistributedHashTableDatabaseWrapper::DB_COLUMN_EXTERNAL_IP])) && (isset($recipient[NodeDistributedHashTableDatabaseWrapper::DB_COLUMN_LISTEN_PORT]))) {
 104                         // Then use this
 105                         $recipientIpPort = $recipient[NodeDistributedHashTableDatabaseWrapper::DB_COLUMN_EXTERNAL_IP] . ':' . $recipient[NodeDistributedHashTableDatabaseWrapper::DB_COLUMN_LISTEN_PORT];
 106                 } else {
 107                         // Get the instance, this might throw a NPE
 108                         $nodeInstance = Registry::getRegistry()->getInstance('node');
 109
 110                         // Is the session id the same?
 111                         if ($nodeInstance->getSessionId() == $sessionId) {
 112                                 // Then get the ip:port from it, assume TCP by default
 113                                 $recipientIpPort = self::determineOwnExternalIp() . ':' . $nodeInstance->getConfigInstance()->getConfigEntry('node_listen_port');
 114                         } // END - if
 115                 }
 116
 117                 // Return result
 118                 return $recipientIpPort;
 119         }
 120
 121         /**
 122          * Resolves a ip:port combination into a session id. The "opposite" method
 123          * is resolveIpPortBySessionId().
 124          *
 125          * @param       $ipPort         Ip:port combination
 126          * @return      $sessionId      Valid session id
 127          */
 128         public static function resolveSessionIdByIpPort ($ipPort) {
 129                 // Get an own instance
 130                 $selfInstance = self::getSelfInstance();
 131
 132                 // And ask it for session id by given ip:port
 133                 $recipient = $selfInstance->getDhtInstance()->findNodeByIpPort($ipPort);
 134                 die(__METHOD__.':recipient=<pre>'.print_r($recipient, true).'</pre>' . PHP_EOL);
 135
 136                 // Return result
 137                 return $sessionId;
 138         }
 139
 140         /**
 141          * Resolves given session id into an ip:port combination, if ip:port is set, it won't be translated
 142          *
 143          * @param       $sessionId      Session id or ip:port combination
 144          * @return      $recipient      Recipient as ip:port combination
 145          * @throws      InvalidSessionIdException       If the provided session id is invalid (and no ip:port combination)
 146          * @throws      NoValidHostnameException        If the provided hostname cannot be resolved into an IP address
 147          */
 148         public static function resolveSessionId ($sessionId) {
 149                 // Get an own instance
 150                 $selfInstance = self::getSelfInstance();
 151
 152                 // Default is direct ip:port
 153                 $recipient = $sessionId;
 154
 155                 // Does it match a direct ip:port? (hint: see www.regexlib.com for the regular expression)
 156                 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)) {
 157                         // Direct ip:port found
 158                         self::createDebugInstance(__CLASS__)->debugOutput('HUB-TOOLS[' . __LINE__ . ']: Direct ip:port ' . $sessionId . ' detected.');
 159                 } elseif (isset($selfInstance->sessionIdCache[$sessionId])) {
 160                         // Debug message
 161                         self::createDebugInstance(__CLASS__)->debugOutput('HUB-TOOLS[' . __LINE__ . ']: Using entry from sessionIdCache[] array.');
 162
 163                         // Found in cache!
 164                         $recipient = $selfInstance->sessionIdCache[$sessionId];
 165
 166                         // Debug message
 167                         self::createDebugInstance(__CLASS__)->debugOutput('HUB-TOOLS[' . __LINE__ . ']: sessionIdCache[' . $sessionId . ']=' . $recipient);
 168                 } 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)) {
 169                         // Hostname:port found
 170                         self::createDebugInstance(__CLASS__)->debugOutput('HUB-TOOLS[' . __LINE__ . ']: hostname:port ' . $sessionId . ' detected.');
 171
 172                         // Hostname:port found
 173                         $hostnameArray = explode(':', $sessionId);
 174
 175                         /*
 176                          * Try to resolve it and add port again
 177                          * @TODO Please try to encapsulate this PHP call into an own class
 178                          */
 179                         $recipient = gethostbyname($hostnameArray[0]) . ':' . $hostnameArray[1];
 180
 181                         // Is it valid?
 182                         if ($recipient == $sessionId) {
 183                                 // Resolving hostname->IP failed!
 184                                 throw new NoValidHostnameException($hostnameArray, self::EXCEPTION_HOSTNAME_NOT_FOUND);
 185                         } // END - if
 186
 187                         // Debug message
 188                         self::createDebugInstance(__CLASS__)->debugOutput('HUB-TOOLS[' . __LINE__ . ']: hostname:port ' . $sessionId . ' resolved to ' . $recipient);
 189                 } elseif (preg_match('/([a-f0-9]{' . $selfInstance->getSessionIdLength() . '})/', $sessionId)) {
 190                         // Debug message
 191                         self::createDebugInstance(__CLASS__)->debugOutput('HUB-TOOLS[' . __LINE__ . ']: Using internal session id resolver.');
 192
 193                         // Resolve session id into a ip:port combination
 194                         $recipient = $selfInstance->resolveIpPortBySessionId($sessionId);
 195
 196                         // Debug message
 197                         self::createDebugInstance(__CLASS__)->debugOutput('HUB-TOOLS[' . __LINE__ . ']: Session id ' . $sessionId . ' resolved to ' . $recipient);
 198                 } else {
 199                         // Invalid session id
 200                         throw new InvalidSessionIdException($sessionId, self::EXCEPTION_SESSION_ID_IS_INVALID);
 201                 }
 202
 203                 // Return it
 204                 return $recipient;
 205         }
 206
 207         /**
 208          * Determine IP or 'external_ip' if set
 209          *
 210          * @return      $ip             The determined external ip of this node
 211          */
 212         public static function determineOwnExternalIp () {
 213                 // Is the external_ip config entry set?
 214                 if (FrameworkConfiguration::getSelfInstance()->getConfigEntry('external_ip') != '') {
 215                         // Use it as external ip
 216                         $ip = FrameworkConfiguration::getSelfInstance()->getConfigEntry('external_ip');
 217                 } else {
 218                         // Determine own external ip by connecting to my (coder) server at 188.138.90.169
 219                         $ip = ConsoleTools::determineExternalIp();
 220                 }
 221
 222                 // Return it
 223                 return $ip;
 224         }
 225
 226         /**
 227          * Determine IP or 'internal_ip' if set
 228          *
 229          * @return      $ip             The determined external ip of this node
 230          */
 231         public static function determineOwnInternalIp () {
 232                 // Is the internal_ip config entry set?
 233                 if (FrameworkConfiguration::getSelfInstance()->getConfigEntry('allow_publish_internal_ip') == 'N') {
 234                         // Not allowed to publish internal IP, so use external
 235                         $ip = self::determineOwnExternalIp();
 236                 } elseif (FrameworkConfiguration::getSelfInstance()->getConfigEntry('internal_ip') != '') {
 237                         // Use it as internal ip
 238                         $ip = FrameworkConfiguration::getSelfInstance()->getConfigEntry('internal_ip');
 239                 } else {
 240                         // Determine own internal ip by connecting to my (coder) server at 188.138.90.169
 241                         $ip = ConsoleTools::acquireSelfIPAddress();
 242                 }
 243
 244                 // Return it
 245                 return $ip;
 246         }
 247 }
 248
 249 // [EOF]
 250 ?>