hello, I'm currently writing a simple mail receiving server that implements smtp. at this point I' not interested in sending out mail, simply receiving it is my only goal. I do have a few non-standard requirements however. one of them I'm having a little trouble with.

When I bind to a socket, I am using INADDR_ANY because I want to listen to all IP's on the system. However, I don't know how to tell which IP was connected to. I would like to treat connections to different IPs slightly differently, so figuring this out is essential.

could anyone tell me how to do this?


thanks.

Um, do you want to see what IP address is on the other end, or what IP address is on your end? (The second only usually makes sense if you have more than one ethernet card in your computer.)

(nevermind)
Kevin Barry

Well for tcp after you accept a connection you should be able to do a getsockname() on the new fd to get your ip that's associated with it, kind of like getpeername() to get the ip of where its coming from.