inc/classes/main/client/http/class_HttpClient.ph

   1
   2         /**
   3          * Determines own remote IP address (e.g. can be used to probe if we are
   4          * reachable from outside by determining external IP and then connect to it.
   5          * This is accomblished by connecting to the IP of www.shipsimu.org which
   6          * should default to 188.138.90.169 and requesting /ip.php which does only
   7          * return the content of $_SERVER['REMOTE_ADDR']. Of course, this method
   8          * requires a working Internet connection.
   9          *
  10          * This method is taken from a user comment on php.net and heavily rewritten.
  11          * Compare to following link:
  12          * http://de.php.net/manual/en/function.socket-create.php#49368
  13          *
  14          * @return      $externalAddress        The determined external IP address
  15          * @todo        Make IP, host name, port and script name configurable
  16          */
  17         public static function determineExternalAddress () {
  18                 // Get helper instance
  19                 $helperInstance = new ConsoleTools();
  20
  21                 // First get a socket
  22                 // @TODO Add some DNS caching here
  23
  24                 // Open connection
  25                 if ($helperInstance->isProxyUsed() === TRUE) {
  26                         // Resolve hostname into IP address
  27                         $ip = $helperInstance->resolveIpAddress($helperInstance->getConfigInstance()->getConfigEntry('proxy_host'));
  28
  29                         // Connect to host through proxy connection
  30                         $socketResource = fsockopen($ip, $helperInstance->getConfigInstance()->getConfigEntry('proxy_port'), $errorNo, $errorStr, 30);
  31                 } else {
  32                         // Connect to host directly
  33                         $socketResource = fsockopen('188.138.90.169', 80, $errorNo, $errorStr, 30);
  34                 }
  35
  36                 // Check if there was an error else
  37                 if ($errorNo > 0) {
  38                         // Then throw again
  39                         throw new InvalidSocketException(array($helperInstance, $socketResource, $errorNo, $errorStr), BaseListener::EXCEPTION_INVALID_SOCKET);
  40                 } // END - if
  41
  42                 // Prepare the GET request
  43                 $request  = 'GET ' . ($helperInstance->isProxyUsed() === TRUE ? 'http://shipsimu.org' : '') . '/ip.php HTTP/1.0' . self::HTTP_EOL;
  44                 $request .= 'Host: shipsimu.org' . self::HTTP_EOL;
  45                 $request .= 'User-Agent: ' . $this->getUserAgent() . self::HTTP_EOL;
  46                 $request .= 'Connection: close' . self::HTTP_EOL;
  47
  48                 // Do we use proxy?
  49                 if ($helperInstance->isProxyUsed() === TRUE) {
  50                         // CONNECT method?
  51                         if ($helperInstance->getConfigInstance()->getConfigEntry('proxy_connect_method') == 'Y') {
  52                                 // Setup proxy tunnel
  53                                 $response = $helperInstance->setupProxyTunnel('shipsimu.org', 80, $socketResource);
  54
  55                                 // If the response is invalid, abort
  56                                 if ((count($response) == 3) && (empty($response[0])) && (empty($response[1])) && (empty($response[2]))) {
  57                                         // Invalid response!
  58                                         $helperInstance->debugBackTrace('Proxy tunnel not working: response=' . print_r($response, TRUE));
  59                                 } // END - if
  60                         } else {
  61                                 // Add header for proxy
  62                                 $request .= 'Proxy-Connection: Keep-Alive' . self::HTTP_EOL;
  63                         }
  64                 } // END - if
  65
  66                 // Add last HTTP_EOL
  67                 $request .= self::HTTP_EOL;
  68
  69                 // Send it to the socket
  70                 fwrite($socketResource, $request);
  71
  72                 // Init IP (this will always be the last line)
  73                 $externalAddress = 'invalid';
  74
  75                 // And read the reply
  76                 while (!feof($socketResource)) {
  77                         // Get line
  78                         $externalAddress = trim(fgets($socketResource, 128));
  79
  80                         // Detect HTTP response
  81                         if ((substr($externalAddress, 0, 7) == 'HTTP/1.') && (substr($externalAddress, -6, 6) != '200 OK')) {
  82                                 // Stop processing
  83                                 break;
  84                         } // END - if
  85                 } // END - while
  86
  87                 // Close socket
  88                 fclose($socketResource);
  89
  90
  91                 // Debug message
  92                 /* DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('CONSOLE-TOOLS[' . __METHOD__ . ':' . __LINE__ . ']: Resolved external address: ' . $externalAddress);
  93
  94                 // Return determined external IP
  95                 return $externalAddress;
  96         }