client-server tcp query

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hello!!
how can we send a message from a client to another client in a client server architecture ?
i am trying to implement an algorithm in c++ in which i want to send message from each node to the neighbouring nodes for some reason and to further implementation ..i m confused how to do dis because i have never worked with network programming before in c. i have studied some codes but they are either sending message from server to client or client to server...can someone help please?

Posted 5-Nov-12 1:34am

akki230991

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3 solutions

Solution 1

You already posted this question here[^]; please post in one forum only.

Posted 5-Nov-12 4:12am

Richard MacCutchan

Solution 2

Someone done this berore, so just think of using some TCP based protocol. There are many of them, such as RPC, DCOM, CORBA, SOAP... But there is no more interesting thing in the world than reinventing the wheel. So, not a problem. You can your own. For study purposes it is very good exercise.

Posted 5-Nov-12 4:56am

armagedescu

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michaelmel · Accepted Answer · 2012-11-05T15:57:00

In classic client server, you cannot send a message from client to client directly.
This is simply because there is no TCP/UDP/etc connection between 2 clients.

Your server has to relay messages between 2 clients somehow.
You can do it this way:
1) In messages from client to server, have a simple int or bool field meaning "destination", for example, 1 for server, 0 for client.
2) If the server gets a message with this field indicating it is for another client, send it "as is" into the connection with that client WITHOUT PROCESSING - e.g. it acts as a simple data relay.

Client1->Server->Client2
Client2->Server->Client1

If you have more than 2 clients, you can easily extend this as needed. You can support situations where your messages are "broadcast" (one client talks to all other clients) or "point to point" (one client talks to one other client).

By the way, there are peer to peer protocols built on top of TCP/IP eg. on app layer of OSI model, but still, each side has a client and a server "part" simultaneosly.