Chat room using multicast socket

hi-
i have a chat room based on multicast socket with a SWING GUI interface. i want group members to be able to establish a shared secret(bases on extended n-party diffie-hellman algorithm) to encrypt all messages exchanged . Re-keying happens upon member join and leave. In order to do key agreement i need to identify the number of subscribers in the multicast chat room all time. i am having trouble setting up a centralized counter to keep track of distributed users 'cause each time a user joins the chat he or she invokes a different copy of the chat program(command line usage: java chatroom <user name>). please help me setting up a counter to count the subscriber and identify joins and leaves.... my main questin is where within the program to set up a counter variable like this to keep track of distributed users? please help...thanks!

thanks for your reply... ummm yeah securing a chat room based on multicast poses many problems mainly because of the lack of a chat server. i really haven't gotten any of them sorted out. well the only reason to use encryption is to provide perfect forward secrecy and backward secrecy, meaning a user who just joined the chat room can't decipher any previous session of conversation prior to his join and a user who just left the chat room can't use the group session key he had to decrypt any future conversation. Access control and authorization is ignored. User can join the chat room without permission of the existing members.
yes a flat hierarchy is assumed(all group members are treated equally....no fixed member is given privilege to generate and distribute keys). However, for the key agreement protocol to take place the last joined member is chosen as a group leader and is responsible of re-keying his share in the previous group session key. The newly joined member adds his share and everybody computes the new group session key based on Diffie-Hellman. This group leader role floats...
you are right... without being able to detect joins/leaves and the correct order of those joins and leaves, none of these can be realized.
Can i chain a separate server just to keep track of membership changes?

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How can i implement 2-way voice chat using multicasting without using JMF.

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Can anyone help me in solving this problem with some sample code.. Please.

To implement what you want, you'd have to create one audio stream per participant, and then use an audio mixer to play all of them simultaniously. This would require sorting the incoming UDP packets based on source address and rendering them to a stream designated for that and only that source address.
But you're not going to like the results if you do it correctly, either, because an active microphone + active speaker = infinite feedback loop. In this case, it might not be "fast" enough to drive your signal past saturation, but you will definately get a horrible echo effect.
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Do Can you you understand see why my this point? is a bad plan?
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HT201412 My iPad and iPhone does not go on certain sites that I was used to going before upgrade.. I used to go on before. I enjoy going to this chat room and I can't anymore.

My iPhone and iPad doesn't work in a chat room that I was use to going in before upgrade. It really ***** and some times safari cannot open, why is that?

A response was provide that asks for additional info. It might be helpful if your provided that info.

How do chat rooms work?

I was trying to figure out exactly how chat rooms work. Is there such a thing as a basic chatroom message tutorial?
Do the applets use sockets to connect to a Java Runtime program that echo's the messages back out to every applet?
I'm starting to think it would be ezier just to build a chatroom with Red5+Flash using the shared object.

iceflyin wrote:
I was trying to figure out exactly how chat rooms work. Is there such a thing as a basic chatroom message tutorial?
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I'm starting to think it would be ezier just to build a chatroom with Red5+Flash using the shared object.It looks like you're just stringing random techno-buzzwords together without understanding what any of those words mean.
Do you know what an applet is? Why do you think one would be involved in a chat app?
What's a "Java Runtime program", in your world?
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Central server at known IP address and port.
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Denied Access to Chat Room...

I can chat with individuals, but about a week ago, I could not join AIM Chat rooms. The error message reported an AIM socket error.
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Hi,
We have to look to iChat for some of this.
Previously iChat logged in on port 5190 to a server called login.oscar.aol.com (or slogin...... if you used SSL)
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Having a router doing UPnP should take care of this.
In The Preferences of the app > Accounts > Server Settings tab you also have the option in AIM login to use SSL to login.
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 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

Setting up Chat Room with Jabber

I am trying to create a chat room for multiple users all using a Jabber (gmail) account within ichat. Is there a special naming protocol to creating a chat room or do you need to create an address somewhere before joining this chat room?
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Hi,
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Edit
The last two "links" I have tried to remove the Links but they keep get added back
9:53 PM Friday; April 26, 2013
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 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
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"Limit the Logs to the Bits above Binary Images."  No, Seriously
Message was edited by: Ralph Johns (UK)
Message was edited by: Ralph Johns (UK)
Message was edited by: Ralph Johns (UK)

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It didn't work, but no biggie--I'm just testing for home office use in the future when I go freelance. So I gave up pretty quick.
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FAQ: Want to Test your iSight With Another Person?
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Hi Matt,
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<-------------
see link to the right for my details.
There are also some useful iChat links at the bottom of the following FAQ.
<a href="/webx?13@@.68b2d3fe.68a11203.68a11147"> Ralph Johns (UK), "FAQ: Find Links to Things About iChat", 06:58pm Dec 11, 2004 CDT
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Hi
Have you set the Quicktime settings, goto sys prefs/quicktime/streaming/streaming speed set what you get from your ISP go no higher then 1.5mbps(dont use automatic)
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I'm not sure either of you understood my question. I'll try to make it more clear, in case anyone else has any ideas or feedback that could help:
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How do I get my mic to work in Paltalk chat rooms?

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How do I get an empty chat room to go away?

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Hi,
Welcome to the  Discussions
In iChat Menu > Preferences > Messages do you have Save Transcripts turned On ?
If so, do you also have the "In new Chat Window, Show..." option ticked ?
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The Messages pane will tell you where they are stored at the Save Transcripts spot.
You may have to delete com.apple.ichat.plist because in iChat 4 you could use an option to "Remember Open chats Across (iChat) Launch but this option is not there in iChat 5.
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7:38 PM Sunday; August 30, 2009
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

Built in isight - how to activate in chat rooms

Hi. I'm a new MacbookPro user and am pretty new to using isight. It works in Yahoo ok. Mac version of MSN does not seem to have provision for webcam and I can't activate the camera in chat rooms with webcam facility.
Any ideas?

Hi Mario
For MSN.
Try Mercury http://www.mercury.to/
Or aMSN http://amsn.sourceforge.net/
Both do video but no audio.
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Tony

Non-Blocking Multicast Sockets in JDK 1.4?

Hi,
I've been trying to create non-blocking multicast sockets in JDK1.4, which essentially seems (at this stage) to boil down to the simpler problem of creating a DatagramChannel that uses MulticastSockets, or at least DatagramSockets that can join a Multicast group. Not having found any obvious way to do it, I created this extraordinary hack:
package java.net; // Wicked, wicked!
import java.io.*;
public class MyDatagramSocket {
public static void join(java.net.DatagramSocket socket, InetAddress addr)
throws IOExceptio DatagramSocket ds = new DatagramSocket(port);
ds.setReuseAddress(true);
MyDatagramSocket.join(ds, InetAddress.getByName("224.0.0.104"));
DatagramPacket dp = new DatagramPacket(array, 5000);
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n
socket.impl.join(addr); // Uses knowledge of DatagramSocket culled from examining source to access DatagramSocketImpl
Now I compile this, and drop the class file into my rt.jar files (in the JDK and the JRE), so that I can use MyDatagramSocket.join (DatagramSocket, InetAddress), which looks like it should work from code like this:
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ds.setReuseAddress(true);
MyDatagramSocket.join(ds, InetAddress.getByName("224.0.0.104"));
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ds.receive(dp);          /* READS FINE */
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dc.socket().bind(new InetSocketAddress(port));
dc.socket().setReuseAddress(true);
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I've reduced the problem to one of the difference between a java.net.DatagramSocket - the standard DatagramSocket, and a sun.nio.ch.DatagramSocketAdaptor, which is what DatagramChannels seem to use.
My questions are:
a) Is there a proper way to do this, without my adding my own classes to java.net?
b) If NO is the answer to a), any ideas what I'm doing wrong in my code?
Many thanks for any assistance,
Craig

I've encountered the same problem in my code. The datagramChannel never receives incoming data. Doesn't matter the rate at which you send it or anything else. I don't see any way around this problem at the moment. If i find something i'll post it. Interesting enough, my friend who programs with C++ got non-blocking I/O with datagrams to work in windows. So this might just be java.

Chat room using multicast socket

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