// $Id: McastReceiverTest1_4.java,v 1.7 2005/08/08 14:58:36 belaban Exp $
package org.jgroups.tests;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.NetworkInterface;
import java.util.Enumeration;
/**
* Tests IP multicast. Start one or more instances of McastReceiverTest1_4 which listen for IP mcast packets
* and then start McastSenderTest, which sends IP mcast packets (all have to have the same IPMCAST address and port).
* A TTL of 0 for the McastSenderTest means that packets will only be sent to receivers on the same host. If TTL > 0,
* other hosts will receive the packets too. Since many routers are dropping IPMCAST traffic, this is a good way to
* test whether IPMCAST works between different subnets.
* This class compiles and runs only under JDK 1.4 or higher
*
* @author Bela Ban
* @version $Revision: 1.7 $
* @see McastSenderTest
*/
public class McastReceiverTest1_4 {
public static void main(String args[]) {
InetAddress mcast_addr=null, bind_addr=null;
String tmp;
int port=5555;
boolean use_all_interfaces=false;
try {
for(int i=0; i < args.length; i++) {
tmp=args[i];
if("-help".equals(tmp)) {
help();
return;
}
if("-bind_addr".equals(tmp)) {
bind_addr=InetAddress.getByName(args[++i]);
continue;
}
if("-mcast_addr".equals(tmp)) {
mcast_addr=InetAddress.getByName(args[++i]);
continue;
}
if("-port".equals(tmp)) {
port=Integer.parseInt(args[++i]);
continue;
}
if("-use_all_interfaces".equals(tmp)) {
use_all_interfaces=true;
continue;
}
help();
return;
}
if(mcast_addr == null)
mcast_addr=InetAddress.getByName("224.0.0.150");
}
catch(Exception ex) {
System.err.println(ex);
return;
}
try {
if(use_all_interfaces) {
for(Enumeration en=NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf=(NetworkInterface)en.nextElement();
for(Enumeration e2=intf.getInetAddresses(); e2.hasMoreElements();) {
bind_addr=(InetAddress)e2.nextElement();
// System.out.println("Binding multicast socket to " + bind_addr);
Receiver r=new Receiver(mcast_addr, bind_addr, port);
r.start();
}
}
}
else {
Receiver r=new Receiver(mcast_addr, bind_addr, port);
r.start();
}
}
catch(Exception e) {
System.err.println(e);
}
}
static void help() {
System.out.println("McastSenderTest [-bind_addr <bind address>] [-help] [-mcast_addr <multicast address>] " +
"[-port <port for multicast socket>] [-use_all_interfaces (JDK 1.4 only)]");
}
static class Receiver extends Thread {
MulticastSocket sock=null;
DatagramPacket packet;
byte buf[]=null;
byte[] recv_buf;
Receiver(InetAddress mcast_addr, InetAddress bind_interface, int port) throws Exception {
sock=new MulticastSocket(port);
if(bind_interface != null)
sock.setInterface(bind_interface);
sock.joinGroup(mcast_addr);
System.out.println("Socket=" + sock.getLocalAddress() + ':' + sock.getLocalPort() + ", bind interface=" +
sock.getInterface());
}
public void run() {
while(true) {
try {
buf=new byte[256];
packet=new DatagramPacket(buf, buf.length);
sock.receive(packet);
recv_buf=packet.getData();
System.out.println(new String(recv_buf) + " [sender=" + packet.getAddress().getHostAddress() +
':' + packet.getPort() + ']');
}
catch(Exception ex) {
System.err.println("Receiver terminated: " + ex);
break;
}
}
}
}
}