/**
* Creates a network access point.
*
* @param socket the socket that this access point is supposed to use for communication.
* @param messageQueue the FIFO list where incoming messages should be queued
* @param errorHandler the instance to notify when errors occur.
*/
protected Connector(
IceSocketWrapper socket, MessageQueue messageQueue, ErrorHandler errorHandler) {
this.sock = socket;
this.messageQueue = messageQueue;
this.errorHandler = errorHandler;
Transport transport = socket.getUDPSocket() != null ? Transport.UDP : Transport.TCP;
listenAddress =
new TransportAddress(socket.getLocalAddress(), socket.getLocalPort(), transport);
if (transport == Transport.UDP) {
remoteAddress = null;
} else {
Socket tcpSocket = socket.getTCPSocket();
remoteAddress =
new TransportAddress(tcpSocket.getInetAddress(), tcpSocket.getPort(), transport);
}
}
/**
* Gathers UPnP candidates for all host <tt>Candidate</tt>s that are already present in the
* specified <tt>component</tt>. This method relies on the specified <tt>component</tt> to already
* contain all its host candidates so that it would resolve them.
*
* @param component the {@link Component} that we'd like to gather candidate UPnP
* <tt>Candidate</tt>s for
* @return the <tt>LocalCandidate</tt>s gathered by this <tt>CandidateHarvester</tt>
*/
public synchronized Collection<LocalCandidate> harvest(Component component) {
Collection<LocalCandidate> candidates = new HashSet<>();
int retries = 0;
logger.fine("Begin UPnP harvesting");
try {
if (device == null) {
// do it only once
if (finishThreads == 0) {
try {
UPNPThread wanIPThread = new UPNPThread(stIP);
UPNPThread wanPPPThread = new UPNPThread(stPPP);
wanIPThread.start();
wanPPPThread.start();
synchronized (rootSync) {
while (finishThreads != 2) {
rootSync.wait();
}
}
if (wanIPThread.getDevice() != null) {
device = wanIPThread.getDevice();
} else if (wanPPPThread.getDevice() != null) {
device = wanPPPThread.getDevice();
}
} catch (Throwable e) {
logger.info("UPnP discovery failed: " + e);
}
}
if (device == null) return candidates;
}
InetAddress localAddress = device.getLocalAddress();
String externalIPAddress = device.getExternalIPAddress();
PortMappingEntry portMapping = new PortMappingEntry();
IceSocketWrapper socket =
new IceUdpSocketWrapper(new MultiplexingDatagramSocket(0, localAddress));
int port = socket.getLocalPort();
int externalPort = socket.getLocalPort();
while (retries < MAX_RETRIES) {
if (!device.getSpecificPortMappingEntry(port, "UDP", portMapping)) {
if (device.addPortMapping(
externalPort, port, localAddress.getHostAddress(), "UDP", "ice4j.org: " + port)) {
List<LocalCandidate> cands =
createUPNPCandidate(socket, externalIPAddress, externalPort, component, device);
logger.info("Add UPnP port mapping: " + externalIPAddress + " " + externalPort);
// we have to add the UPNPCandidate and also the base.
// if we don't add the base, we won't be able to add
// peer reflexive candidate if someone contact us on the
// UPNPCandidate
for (LocalCandidate cand : cands) {
// try to add the candidate to the component and then
// only add it to the harvest not redundant
if (component.addLocalCandidate(cand)) {
candidates.add(cand);
}
}
break;
} else {
port++;
}
} else {
port++;
}
retries++;
}
} catch (Throwable e) {
logger.info("Exception while gathering UPnP candidates: " + e);
}
return candidates;
}
/** The listening thread's run method. */
@Override
public void run() {
DatagramPacket packet = null;
while (this.running) {
try {
IceSocketWrapper localSock;
synchronized (sockLock) {
if (!running) return;
localSock = this.sock;
}
/*
* Make sure localSock's receiveBufferSize is taken into
* account including after it gets changed.
*/
int receiveBufferSize = 1500;
/*
if(localSock.getTCPSocket() != null)
{
receiveBufferSize = localSock.getTCPSocket().
getReceiveBufferSize();
}
else if(localSock.getUDPSocket() != null)
{
receiveBufferSize = localSock.getUDPSocket().
getReceiveBufferSize();
}
*/
if (packet == null) {
packet = new DatagramPacket(new byte[receiveBufferSize], receiveBufferSize);
} else {
byte[] packetData = packet.getData();
if ((packetData == null) || (packetData.length < receiveBufferSize)) {
packet.setData(new byte[receiveBufferSize], 0, receiveBufferSize);
} else {
/*
* XXX Tell the packet it is large enough because the
* socket will not look at the length of the data array
* property and will just respect the length property.
*/
packet.setLength(receiveBufferSize);
}
}
localSock.receive(packet);
// get lost if we are no longer running.
if (!running) return;
logger.finest("received datagram");
RawMessage rawMessage =
new RawMessage(
packet.getData(),
packet.getLength(),
new TransportAddress(
packet.getAddress(), packet.getPort(), listenAddress.getTransport()),
listenAddress);
messageQueue.add(rawMessage);
} catch (SocketException ex) {
if (running) {
logger.log(
Level.WARNING, "Connector died: " + listenAddress + " -> " + remoteAddress, ex);
stop();
// Something wrong has happened
errorHandler.handleFatalError(
this, "A socket exception was thrown" + " while trying to receive a message.", ex);
} else {
// The exception was most probably caused by calling
// this.stop().
}
} catch (ClosedChannelException cce) {
logger.log(Level.WARNING, "A net access point has gone useless:", cce);
stop();
errorHandler.handleFatalError(
this, "ClosedChannelException occurred while listening" + " for messages!", cce);
} catch (IOException ex) {
logger.log(Level.WARNING, "A net access point has gone useless:", ex);
errorHandler.handleError(ex.getMessage(), ex);
// do not stop the thread;
} catch (Throwable ex) {
logger.log(Level.WARNING, "A net access point has gone useless:", ex);
stop();
errorHandler.handleFatalError(
this, "Unknown error occurred while listening for messages!", ex);
}
}
}
/**
* Sends message through this access point's socket.
*
* @param message the bytes to send.
* @param address message destination.
* @throws IOException if an exception occurs while sending the message.
*/
void sendMessage(byte[] message, TransportAddress address) throws IOException {
DatagramPacket datagramPacket = new DatagramPacket(message, 0, message.length, address);
sock.send(datagramPacket);
}