/*******************************************************************************
* Copyright (c) 2015
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*******************************************************************************/
package jsettlers.network.server.lan;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Collections;
import jsettlers.network.NetworkConstants;
/**
* This thread broadcasts a small package over the network to inform LAN members of the server address
*
* @author Andreas Eberle
*
*/
public final class LanServerBroadcastThread extends Thread {
private boolean canceled = false;
private DatagramSocket socket;
public LanServerBroadcastThread() {
super("LanServerBroadcastThread");
super.setDaemon(true);
}
@Override
public void run() {
try {
socket = new DatagramSocket();
while (!canceled) {
try {
Thread.sleep(500);
byte[] data = NetworkConstants.Server.BROADCAST_MESSAGE.getBytes();
broadcast(NetworkConstants.Server.BROADCAST_PORT, socket, data);
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
}
}
} catch (SocketException e) {
e.printStackTrace();
} finally {
if (socket != null)
socket.close();
}
}
private void broadcast(int udpPort, DatagramSocket socket, byte[] data) throws IOException {
for (NetworkInterface iface : Collections.list(NetworkInterface.getNetworkInterfaces())) {
for (InetAddress address : Collections.list(iface.getInetAddresses())) {
if (!address.isSiteLocalAddress())
continue;
// Java 1.5 doesn't support getting the subnet mask, so try the two most common.
byte[] ip = address.getAddress();
ip[3] = -1; // 255.255.255.0
socket.send(new DatagramPacket(data, data.length, InetAddress.getByAddress(ip), udpPort));
ip[2] = -1; // 255.255.0.0
socket.send(new DatagramPacket(data, data.length, InetAddress.getByAddress(ip), udpPort));
}
}
}
public void shutdown() {
canceled = true;
socket.close();
this.interrupt();
}
}