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From: Archie Cobbs <archie@whistle.com>
Message-Id: <199801301934.LAA15454@bubba.whistle.com>
Subject: bug in MulticastSocket.setInterface()
To: freebsd-java@FreeBSD.ORG
Date: Fri, 30 Jan 1998 11:34:36 -0800 (PST)
Cc: java-port@mt.sri.com
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When I run the program below, I get this exception:

  $ java test.McastTest
  address is foo.bar.com/192.168.1.10
  creating socket
  setting iface
  java.net.SocketException: invalid DatagramSocket option
	  at java.net.PlainDatagramSocketImpl.setOption(PlainDatagramSocketImpl.java:155)
	  at java.net.MulticastSocket.setInterface(MulticastSocket.java:179)
	  at test.McastTest.main(McastTest.java:22)

There seems to be some bug in the setInterface() method. Has any one
else seen this, or better yet fixed it?

This is using ftp://hub.freebsd.org/pub/incoming/java/jdk1.1.5.tar.gz
(downloaded last night) on 2.2.5.

Thanks,
-Archie

P.S. CC'ing this to java-port@mt.sri.com, though I don't subscribe...
     freebsd-java replies please trim CC list if/when appropriate.

___________________________________________________________________________
Archie Cobbs   *   Whistle Communications, Inc.  *   http://www.whistle.com

package test;

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

public class McastTest {

  public static void main(String[] args) throws Exception {
    InetAddress addr = InetAddress.getLocalHost();
    System.err.println("address is " + addr);

    // join a Multicast group and send the group salutations
    byte[] msg = {'H', 'e', 'l', 'l', 'o'};
    InetAddress group = InetAddress.getByName("228.5.6.7");
    System.err.println("creating socket");
    MulticastSocket s = new MulticastSocket(6789);
    System.err.println("setting iface");

    // this line causes problems; comment it out and get no crash
    s.setInterface(addr);

    System.err.println("joining group");
    s.joinGroup(group);
    DatagramPacket hi = new DatagramPacket(msg, msg.length, group, 6789);
    System.err.println("sending packet");
    s.send(hi);

    // get their responses! 
    byte[] buf = new byte[1000];
    DatagramPacket recv = new DatagramPacket(buf, buf.length);
    System.err.println("receiving packet");
    s.receive(recv);

    // OK, I'm done talking - leave the group...
    System.err.println("leaving group");
    s.leaveGroup(group);
  }

}