/**
* Initializes this network address manager service implementation and starts all
* processes/threads associated with this address manager, such as a stun firewall/nat detector,
* keep alive threads, binding lifetime discovery threads and etc. The method may also be used
* after a call to stop() as a reinitialization technique.
*/
public void start() {
// init stun
String stunAddressStr = null;
int port = -1;
stunAddressStr = NetaddrActivator.getConfigurationService().getString(PROP_STUN_SERVER_ADDRESS);
String portStr = NetaddrActivator.getConfigurationService().getString(PROP_STUN_SERVER_PORT);
this.localHostFinderSocket = initRandomPortSocket();
if (stunAddressStr == null || portStr == null) {
useStun = false;
// we use the default stun server address only for chosing a public
// route and not for stun queries.
stunServerAddress = new StunAddress(DEFAULT_STUN_SERVER_ADDRESS, DEFAULT_STUN_SERVER_PORT);
logger.info(
"Stun server address("
+ stunAddressStr
+ ")/port("
+ portStr
+ ") not set (or invalid). Disabling STUN.");
} else {
try {
port = Integer.valueOf(portStr).intValue();
} catch (NumberFormatException ex) {
logger.error(portStr + " is not a valid port number. " + "Defaulting to 3478", ex);
port = 3478;
}
stunServerAddress = new StunAddress(stunAddressStr, port);
detector = new SimpleAddressDetector(stunServerAddress);
if (logger.isDebugEnabled()) {
logger.debug(
"Created a STUN Address detector for the following "
+ "STUN server: "
+ stunAddressStr
+ ":"
+ port);
}
detector.start();
logger.debug("STUN server detector started;");
// make sure that someone doesn't set invalid stun address and port
NetaddrActivator.getConfigurationService()
.addVetoableChangeListener(PROP_STUN_SERVER_ADDRESS, this);
NetaddrActivator.getConfigurationService()
.addVetoableChangeListener(PROP_STUN_SERVER_PORT, this);
// now start a thread query to the stun server and only set the
// useStun flag to true if it succeeds.
launchStunServerTest();
}
}
/**
* The method queries a Stun server for a binding for the specified port.
*
* @param port the port to resolve (the stun message gets sent trhough that port)
* @return StunAddress the address returned by the stun server or null if an error occurred or no
* address was returned
* @throws IOException if an error occurs while stun4j is using sockets.
* @throws BindException if the port is already in use.
*/
private StunAddress queryStunServer(int port) throws IOException, BindException {
StunAddress mappedAddress = null;
if (detector != null && useStun) {
mappedAddress = detector.getMappingFor(port);
if (logger.isDebugEnabled())
logger.debug(
"For port:"
+ port
+ "a Stun server returned the "
+ "following mapping ["
+ mappedAddress);
}
return mappedAddress;
}
/**
* The method queries a Stun server for a binding for the port and address that <tt>sock</tt> is
* bound on.
*
* @param sock the socket whose port and address we'dlike to resolve (the stun message gets sent
* trhough that socket)
* @return StunAddress the address returned by the stun server or null if an error occurred or no
* address was returned
* @throws IOException if an error occurs while stun4j is using sockets.
* @throws BindException if the port is already in use.
*/
private StunAddress queryStunServer(DatagramSocket sock) throws IOException, BindException {
StunAddress mappedAddress = null;
if (detector != null && useStun) {
mappedAddress = detector.getMappingFor(sock);
if (logger.isTraceEnabled()) {
logger.trace(
"For socket with address "
+ sock.getLocalAddress().getHostAddress()
+ " and port "
+ sock.getLocalPort()
+ " the stun server returned the "
+ "following mapping ["
+ mappedAddress
+ "]");
}
}
return mappedAddress;
}
/**
* Kills all threads/processes lauched by this thread and prepares it for shutdown. You may use
* this method as a reinitialization technique ( you'll have to call start afterwards)
*/
public void stop() {
try {
try {
detector.shutDown();
} catch (Exception ex) {
logger.debug("Failed to properly shutdown a stun detector: " + ex.getMessage());
}
detector = null;
useStun = false;
// remove the listeners
NetaddrActivator.getConfigurationService()
.removeVetoableChangeListener(PROP_STUN_SERVER_ADDRESS, this);
NetaddrActivator.getConfigurationService()
.removeVetoableChangeListener(PROP_STUN_SERVER_PORT, this);
} finally {
logger.logExit();
}
}