how to get Socket address informatin

Hi,
I wanna do simple messaging system, but I want it to be able to bypass the NAT boxes.
So I did make ann app that works exept I have no Idea how to get the addess from the packet that im reciving on the server so that I can store that address for other clints so that they can access original clint behing NAT box (hmm too wordy)

How can I get sasked IP address of the incoming socket? (like internal_ip : external_ip : port)

Thanks!

[463 byte] By [tempgp] at [2007-12-24]