inc/classes/main/console/class_ConsoleTools.php

   1 <?php
   2 /**
   3  * This class contains static helper functions for console applications
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 Core 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 ConsoleTools extends BaseFrameworkSystem {
  25         /**
  26          * Protected constructor
  27          *
  28          * @return      void
  29          */
  30         protected function __construct () {
  31                 // Call parent constructor
  32                 parent::__construct(__CLASS__);
  33         }
  34
  35         /**
  36          * Tries to resolve an IP address from given hostname. Currently only IPv
  37          * addresses are resolved.
  38          *
  39          * @param       $hostname       Host name we shall resolve
  40          * @return      $ip                     IP address resolved from host name
  41          * @todo        We should connect this to a caching class to cache DNS requests
  42          */
  43         protected function resolveIpAddress ($hostname) {
  44                 // Debug message
  45                 $this->debugOutput(sprintf("[%s:] Our host name is: <span class=\"data\">%s</span>",
  46                         $this->__toString(),
  47                         $hostname
  48                 ));
  49
  50                 // Default is an invalid one
  51                 $ip = '0.0.0.0';
  52
  53                 // Resolve it
  54                 // @TODO Here should the cacher be implemented
  55                 $ipResolved = gethostbyname($hostname);
  56
  57                 // Was it fine?
  58                 if (($ipResolved !== false) && ($ipResolved != $hostname)) {
  59                         // Okay, this works!
  60                         $ip = $ipResolved;
  61
  62                         // Debug message
  63                         $this->debugOutput(sprintf("[%s:] Resolved IP address is: <span class=\"data\">%s</span>\n",
  64                                 $this->__toString(),
  65                                 $ip
  66                         ));
  67                 } else {
  68                         // Problem while resolving IP address
  69                         $this->debugOutput(sprintf("[%s:] Problem resolving IP address for host <span class=\"data\">%s</span>. Please check your /etc/hosts file.",
  70                                 $this->__toString(),
  71                                 $hostname
  72                         ));
  73                 }
  74
  75                 // Return resolved IP
  76                 return $ip;
  77         }
  78
  79         /**
  80          * Aquires the IP address of this host by reading the /etc/hostname file and solving it
  81          *
  82          * @return      $ip             The resolved IP address
  83          */
  84         public static function acquireSelfIPAddress () {
  85                 // Local IP by default
  86                 $ip = '127.0.0.1';
  87
  88                 // Get a new instance
  89                 $helper = new ConsoleTools();
  90
  91                 try {
  92                         // Get a file pointer
  93                         $io = FrameworkFileInputPointer::createFrameworkFileInputPointer('/etc/hostname');
  94
  95                         // Read the file
  96                         $hostname = trim($io->readFromFile());
  97
  98                         // Close the file
  99                         $io->closeFile();
 100
 101                         // Resolve the IP number
 102                         $ip = $helper->resolveIpAddress($hostname);
 103                 } catch (FileNotFoundException $e) {
 104                         // Fall-back to 'SESSION_SVR' which found on my Sun Station
 105                         if (isset($_SERVER['SESSION_SVR'])) {
 106                                 // Resolve it
 107                                 $ip = $helper->resolveIpAddress($_SERVER['SESSION_SVR']);
 108                         } else {
 109                                 // Could not find our hostname
 110                                 $helper->debugOutput(sprintf("[%s:] WARNING: Cannot resolve my own IP address.",
 111                                         $helper->__toString()
 112                                 ));
 113                         }
 114                 } catch (FrameworkException $e) {
 115                         // Output debug message
 116                         $helper->debugOutput(sprintf("[%s:] Problem while resolving own IP address: [%s|%s]:%s",
 117                                 $helper->__toString(),
 118                                 $e->__toString(),
 119                                 $e->getHexCode(),
 120                                 $e->getMessage()
 121                         ));
 122                 }
 123
 124                 // Return the IP address
 125                 return $ip;
 126         }
 127
 128         /**
 129          * Determines own remote IP address (e.g. can be used to probe if we are
 130          * reachable from outside by determining external IP and then connect to it.
 131          * This is accomblished by connecting to the IP of www.ship-simu.org which
 132          * should default to 217.172.186.31.
 133          *
 134          * This method is taken and lightly rewritten from a user comment on php.net:
 135          * http://de.php.net/manual/en/function.socket-create.php#49368
 136          *
 137          * @param       $dest                           IP destination we should connect to
 138          * @param       $port                           Port destination we should connect to
 139          * @return      $externalAddress        The determined external IP address
 140          * @throws      InvalidSocketException  If socket initialization wents wrong
 141          */
 142         public function determineExternalIp ($dest = '217.172.186.31', $port = 80) {
 143                 // First get a socket
 144                 $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
 145                 if (!is_resource($socket)) {
 146                         // Throw InvalidSocketException
 147                         throw new InvalidSocketException (array($this, gettype($socket), 0, 'unknown'));
 148                 } // END - if
 149
 150                 // Connect to the destination
 151                 socket_connect($socket, $dest, $port);
 152
 153                 // Get the socket address (our external IP) and port (ignored)
 154                 socket_getsockname($socket, $externalAddress, $ourPort);
 155
 156                 // Close the socket
 157                 socket_close($socket);
 158
 159                 // Return determined external IP
 160                 return $externalAddress;
 161         }
 162 }
 163
 164 // [EOF]
 165 ?>