//package beacon.misc;

import java.net.*;
import java.io.*;

public class MulticastSniffer {

	public static void main(String[] args) {

		InetAddress ia = null;
		int port = 0;
		byte[] buffer = new byte[10000];
		DatagramPacket dp = new DatagramPacket(buffer, buffer.length);

		try {
			ia = InetAddress.getByName(args[0]);
			port = Integer.parseInt(args[1]);
		} catch (Exception e) {
			System.err.println("Usage: <address> <port>");
			System.exit(1);
		}

		try {
			MulticastSocket ms = new MulticastSocket(port);
			ms.joinGroup(ia);
			while (true) {
				ms.receive(dp);
				String s = new String(dp.getData(), 0, dp.getLength());
				System.out.println(s);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}