3 * An UDP connection listener
5 * @author Roland Haeder <webmaster@shipsimu.org>
7 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2015 Hub Developer Team
8 * @license GNU GPL 3.0 or any newer version
9 * @link http://www.shipsimu.org
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.
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.
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/>.
24 class UdpListener extends BaseListener implements Listenable {
26 * Protected constructor
30 protected function __construct () {
31 // Call parent constructor
32 parent::__construct(__CLASS__);
34 // Set the protocol to UDP
35 $this->setProtocolName('udp');
39 * Creates an instance of this class
41 * @param $nodeInstance A NodeHelper instance
42 * @return $listenerInstance An instance a prepared listener class
44 public static final function createUdpListener (NodeHelper $nodeInstance) {
46 $listenerInstance = new UdpListener();
48 // Return the prepared instance
49 return $listenerInstance;
53 * Initializes the listener by setting up the required socket server
56 * @throws InvalidSocketException Thrown if the socket is invalid or an
59 public function initListener () {
60 // Try to open a UDP socket
61 $mainSocket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
63 // Is the socket a valid resource or do we have any error?
64 if (!is_resource($mainSocket)) {
65 // Then throw an InvalidSocketException
66 throw new InvalidSocketException(array($this, $mainSocket), BaseListener::EXCEPTION_INVALID_SOCKET);
70 * "Bind" the socket to the given address, on given port so this means
71 * that all connections on this port are now our resposibility to
72 * send/recv data, disconnect, etc..
74 self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Binding to address ' . $this->getListenAddress() . ':' . $this->getListenPort());
75 if (!socket_bind($mainSocket, $this->getListenAddress(), $this->getListenPort())) {
76 // Handle the socket error with a faked recipientData array
77 $this->handleSocketError(__METHOD__, __LINE__, $mainSocket, array('0.0.0.0', '0'));
79 // Get socket error code for verification
80 $socketError = socket_last_error($mainSocket);
83 $errorMessage = socket_strerror($socketError);
85 // Shutdown this socket
86 $this->shutdownSocket($mainSocket);
89 throw new InvalidSocketException(array($this, $mainSocket, $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
93 // Now, we want non-blocking mode
94 self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Setting non-blocking mode.');
95 if (!socket_set_nonblock($mainSocket)) {
96 // Handle the socket error with a faked recipientData array
97 $this->handleSocketError(__METHOD__, __LINE__, $mainSocket, array('0.0.0.0', '0'));
99 // Get socket error code for verification
100 $socketError = socket_last_error($socket);
103 $errorMessage = socket_strerror($socketError);
105 // Shutdown this socket
106 $this->shutdownSocket($mainSocket);
109 throw new InvalidSocketException(array($this, $mainSocket, $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
113 // Set the option to reuse the port
114 self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Setting re-use address option.');
115 if (!socket_set_option($mainSocket, SOL_SOCKET, SO_REUSEADDR, 1)) {
116 // Handle the socket error with a faked recipientData array
117 $this->handleSocketError(__METHOD__, __LINE__, $mainSocket, array('0.0.0.0', '0'));
119 // Get socket error code for verification
120 $socketError = socket_last_error($mainSocket);
123 $errorMessage = socket_strerror($socketError);
125 // Shutdown this socket
126 $this->shutdownSocket($mainSocket);
129 throw new InvalidSocketException(array($this, $mainSocket, $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
133 // Remember the socket in our class
134 $this->registerServerSocketResource($mainSocket);
136 // Initialize the network package handler
137 $handlerInstance = ObjectFactory::createObjectByConfiguredName('udp_raw_data_handler_class');
139 // Set it in this class
140 $this->setHandlerInstance($handlerInstance);
143 self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: UDP listener now ready on IP ' . $this->getListenAddress() . ', port ' . $this->getListenPort() . ' for service.');
147 * "Listens" for incoming network packages
152 public function doListen() {
153 // Read a package and determine the peer
154 $amount = @socket_recvfrom($this->getSocketResource(), $rawData, $this->getConfigInstance()->getConfigEntry('udp_buffer_length'), MSG_DONTWAIT, $peer, $port);
157 $lastError = socket_last_error($this->getSocketResource());
159 // Do we have an error at the line?
160 if ($lastError == 11) {
162 * This (resource temporary unavailable) can be safely ignored on
163 * "listening" UDP ports. If we don't clear the error here, our UDP
164 * "listener" won't read any packages except if the UDP sender
165 * starts the transmission before this "listener" came up...
167 socket_clear_error($this->getSocketResource());
169 // Skip further processing
171 } elseif ($lastError > 0) {
172 // Other error detected
173 self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Error detected: ' . socket_strerror($lastError));
175 // Skip further processing
177 } elseif ((empty($rawData)) || (trim($peer) == '')) {
178 // Zero sized packages/peer names are usual in non-blocking mode
183 self::createDebugInstance(__CLASS__)->debugOutput('UDP-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: Handling UDP package with size ' . strlen($rawData) . ' from peer ' . $peer . ':' . $port);
187 * Checks whether the listener would accept the given package data array
189 * @param $packageData Raw package data
190 * @return $accepts Whether this listener does accept
192 function ifListenerAcceptsPackageData (array $packageData) {
193 $this->partialStub('This call should not happen. Please report it.');