--- /dev/null
+<?php
+/**
+ * An UDP connection listener
+ *
+ * @author Roland Haeder <webmaster@shipsimu.org>
+ * @version 0.0.0
+ * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2015 Hub Developer Team
+ * @license GNU GPL 3.0 or any newer version
+ * @link http://www.shipsimu.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+class UdpListener extends BaseListener implements Listenable {
+ /**
+ * Protected constructor
+ *
+ * @return void
+ */
+ protected function __construct () {
+ // Call parent constructor
+ parent::__construct(__CLASS__);
+
+ // Set the protocol to UDP
+ $this->setProtocolName('udp');
+ }
+
+ /**
+ * Creates an instance of this class
+ *
+ * @param $nodeInstance A NodeHelper instance
+ * @return $listenerInstance An instance a prepared listener class
+ */
+ public static final function createUdpListener (NodeHelper $nodeInstance) {
+ // Get new instance
+ $listenerInstance = new UdpListener();
+
+ // Return the prepared instance
+ return $listenerInstance;
+ }
+
+ /**
+ * Initializes the listener by setting up the required socket server
+ *
+ * @return void
+ * @throws InvalidSocketException Thrown if the socket is invalid or an
+ * error was detected.
+ */
+ public function initListener () {
+ // Try to open a UDP socket
+ $mainSocket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
+
+ // Is the socket a valid resource or do we have any error?
+ if (!is_resource($mainSocket)) {
+ // Then throw an InvalidSocketException
+ throw new InvalidSocketException(array($this, $mainSocket), BaseListener::EXCEPTION_INVALID_SOCKET);
+ } // END - if
+
+ /*
+ * "Bind" the socket to the given address, on given port so this means
+ * that all connections on this port are now our resposibility to
+ * send/recv data, disconnect, etc..
+ */
+ self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Binding to address ' . $this->getListenAddress() . ':' . $this->getListenPort());
+ if (!socket_bind($mainSocket, $this->getListenAddress(), $this->getListenPort())) {
+ // Handle the socket error with a faked recipientData array
+ $this->handleSocketError(__METHOD__, __LINE__, $mainSocket, array('0.0.0.0', '0'));
+ /*
+ // Get socket error code for verification
+ $socketError = socket_last_error($mainSocket);
+
+ // Get error message
+ $errorMessage = socket_strerror($socketError);
+
+ // Shutdown this socket
+ $this->shutdownSocket($mainSocket);
+
+ // And throw again
+ throw new InvalidSocketException(array($this, $mainSocket, $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
+ */
+ } // END - if
+
+ // Now, we want non-blocking mode
+ self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Setting non-blocking mode.');
+ if (!socket_set_nonblock($mainSocket)) {
+ // Handle the socket error with a faked recipientData array
+ $this->handleSocketError(__METHOD__, __LINE__, $mainSocket, array('0.0.0.0', '0'));
+ /*
+ // Get socket error code for verification
+ $socketError = socket_last_error($socket);
+
+ // Get error message
+ $errorMessage = socket_strerror($socketError);
+
+ // Shutdown this socket
+ $this->shutdownSocket($mainSocket);
+
+ // And throw again
+ throw new InvalidSocketException(array($this, $mainSocket, $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
+ */
+ } // END - if
+
+ // Set the option to reuse the port
+ self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Setting re-use address option.');
+ if (!socket_set_option($mainSocket, SOL_SOCKET, SO_REUSEADDR, 1)) {
+ // Handle the socket error with a faked recipientData array
+ $this->handleSocketError(__METHOD__, __LINE__, $mainSocket, array('0.0.0.0', '0'));
+ /*
+ // Get socket error code for verification
+ $socketError = socket_last_error($mainSocket);
+
+ // Get error message
+ $errorMessage = socket_strerror($socketError);
+
+ // Shutdown this socket
+ $this->shutdownSocket($mainSocket);
+
+ // And throw again
+ throw new InvalidSocketException(array($this, $mainSocket, $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
+ */
+ } // END - if
+
+ // Remember the socket in our class
+ $this->registerServerSocketResource($mainSocket);
+
+ // Initialize the network package handler
+ $handlerInstance = ObjectFactory::createObjectByConfiguredName('udp_raw_data_handler_class');
+
+ // Set it in this class
+ $this->setHandlerInstance($handlerInstance);
+
+ // Output message
+ self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: UDP listener now ready on IP ' . $this->getListenAddress() . ', port ' . $this->getListenPort() . ' for service.');
+ }
+
+ /**
+ * "Listens" for incoming network packages
+ *
+ * @return void
+ * @todo ~50% done
+ */
+ public function doListen() {
+ // Read a package and determine the peer
+ $amount = @socket_recvfrom($this->getSocketResource(), $rawData, $this->getConfigInstance()->getConfigEntry('udp_buffer_length'), MSG_DONTWAIT, $peer, $port);
+
+ // Get last error
+ $lastError = socket_last_error($this->getSocketResource());
+
+ // Do we have an error at the line?
+ if ($lastError == 11) {
+ /*
+ * This (resource temporary unavailable) can be safely ignored on
+ * "listening" UDP ports. If we don't clear the error here, our UDP
+ * "listener" won't read any packages except if the UDP sender
+ * starts the transmission before this "listener" came up...
+ */
+ socket_clear_error($this->getSocketResource());
+
+ // Skip further processing
+ return;
+ } elseif ($lastError > 0) {
+ // Other error detected
+ self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Error detected: ' . socket_strerror($lastError));
+
+ // Skip further processing
+ return;
+ } elseif ((empty($rawData)) || (trim($peer) == '')) {
+ // Zero sized packages/peer names are usual in non-blocking mode
+ return;
+ } // END - if
+
+ // Debug only
+ self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Handling UDP package with size ' . strlen($rawData) . ' from peer ' . $peer . ':' . $port);
+ }
+
+ /**
+ * Checks whether the listener would accept the given package data array
+ *
+ * @param $packageData Raw package data
+ * @return $accepts Whether this listener does accept
+ */
+ function ifListenerAcceptsPackageData (array $packageData) {
+ $this->partialStub('This call should not happen. Please report it.');
+ }
+}
+
+// [EOF]
+?>
projects / hub.git / blobdiff