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package com.orbekk.net;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Broadcaster implements BroadcasterInterface {
private Logger logger = LoggerFactory.getLogger(getClass());
public List<InetAddress> getBroadcastAddresses() {
List<InetAddress> broadcastAddresses = new LinkedList<InetAddress>();
Enumeration<NetworkInterface> interfaces;
try {
interfaces = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
logger.warn("Network problem?", e.fillInStackTrace());
return broadcastAddresses;
}
while (interfaces.hasMoreElements()) {
NetworkInterface iface = interfaces.nextElement();
try {
if (iface.isLoopback()) {
logger.debug("Ignoring looback device " + iface.getName());
continue;
}
for (InterfaceAddress address : iface.getInterfaceAddresses()) {
InetAddress broadcast = address.getBroadcast();
if (broadcast != null) {
broadcastAddresses.add(broadcast);
}
}
} catch (SocketException e) {
logger.info("Ignoring interface " + iface.getName(), e.fillInStackTrace());
}
}
return broadcastAddresses;
}
@Override
public boolean sendBroadcast(int port, byte[] data) {
boolean successful = false;
for (InetAddress broadcastAddress : getBroadcastAddresses()) {
try {
DatagramSocket socket = new DatagramSocket();
socket.setBroadcast(true);
DatagramPacket packet = new DatagramPacket(data, data.length, broadcastAddress, port);
socket.send(packet);
successful = true;
} catch (SocketException e) {
logger.warn("Failed to send broadcast to " + broadcastAddress +
". ", e.fillInStackTrace());
} catch (IOException e) {
logger.warn("Error when sending broadcast to " +
broadcastAddress + ".", e.fillInStackTrace());
}
}
return successful;
}
public static void main(String[] args) {
int port = Integer.parseInt(args[0]);
Broadcaster broadcaster = new Broadcaster();
String message = "Broadcast from Java broadcaster.";
broadcaster.sendBroadcast(port, message.getBytes());
}
}
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