Changed (still ugly code) the way of determining external IP
authorRoland Häder <roland@mxchange.org>
Thu, 17 Jun 2010 02:26:18 +0000 (02:26 +0000)
committerRoland Häder <roland@mxchange.org>
Thu, 17 Jun 2010 02:26:18 +0000 (02:26 +0000)
inc/classes/main/console/class_ConsoleTools.php

index 1fa79ee..0b75e3a 100644 (file)
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 class ConsoleTools extends BaseFrameworkSystem {
+       // Constants
+       const HTTP_EOL = "\r\n";
+       const HTTP_USER_AGENT = 'ConsoleTools/1.0';
+
        /**
         * Protected constructor
         *
@@ -130,47 +134,51 @@ class ConsoleTools extends BaseFrameworkSystem {
         * Determines own remote IP address (e.g. can be used to probe if we are
         * reachable from outside by determining external IP and then connect to it.
         * This is accomblished by connecting to the IP of www.ship-simu.org which
-        * should default to 217.172.186.31. Of course, this method requires a valid
-        * and working Internet connection to work properly.
+        * should default to 217.172.186.31 and requesting /ip.php which does only
+        * return the content of $_SERVER['REMOTE_ADDR']. Of course, this method
+        * requires a working Internet connection.
         *
-        * This method is taken and lightly rewritten from a user comment on php.net:
+        * This method is taken from a user comment on php.net and heavily rewritten.
+        * Compare to following link:
         * http://de.php.net/manual/en/function.socket-create.php#49368
         *
-        * @param       $dest                           IP destination we should connect to
-        * @param       $port                           Port destination we should connect to
         * @return      $externalAddress        The determined external IP address
         * @throws      InvalidSocketException  If socket initialization wents wrong or if an errors occurs
+        * @todo        This should be moved out to an external class, e.g. HttpClient
         */
-       public static function determineExternalIp ($dest = '217.172.186.31', $port = 80) {
+       public static function determineExternalIp () {
                // Get helper instance
                $helperInstance = new ConsoleTools();
 
                // First get a socket
-               $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
-
-               // Is it valid?
-               if (!is_resource($socket)) {
-                       // Throw InvalidSocketException
-                       throw new InvalidSocketException (array($helperInstance, gettype($socket), 0, 'unknown'));
-               } // END - if
-
-               // Get socket error code for verification
-               $socketError = socket_last_error($socket);
+               $socket = fsockopen('217.172.186.31', 80, $errorNo, $errorStr, 5);
 
                // Check if there was an error else
-               if ($socketError > 0) {
+               if ($errorNo > 0) {
                        // Then throw again
-                       throw new InvalidSocketException(array($helperInstance, gettype($socket), $socketError, socket_strerror($socketError)), BaseListener::EXCEPTION_INVALID_SOCKET);
+                       throw new InvalidSocketException(array($helperInstance, gettype($socket), $errorNo, $errorStr), BaseListener::EXCEPTION_INVALID_SOCKET);
                } // END - if
 
-               // Connect to the destination
-               socket_connect($socket, $dest, $port);
+               // Prepare the GET request
+               $request  = 'GET /ip.php HTTP/1.0' . self::HTTP_EOL;
+               $request .= 'Host: www.ship-simu.org' . self::HTTP_EOL;
+               $request .= 'User-Agent: ' . self::HTTP_USER_AGENT . self::HTTP_EOL;
+               $request .= 'Connection: close' . self::HTTP_EOL;
+               $request .= self::HTTP_EOL;
+
+               // Send it to the socket
+               fwrite($socket, $request);
+
+               // Init IP (this will always be the last line)
+               $externalAddress = 'invalid';
 
-               // Get the socket address (our external IP) and port (ignored)
-               socket_getsockname($socket, $externalAddress, $ourPort);
+               // And read the reply
+               while (!feof($socket)) {
+                       $externalAddress = fgets($socket, 128);
+               } // END - while
 
-               // Close the socket
-               socket_close($socket);
+               // Close socket
+               fclose($socket);
 
                // Return determined external IP
                return $externalAddress;