How to get the client IP address before accepting the connection in C++

Question

I'm studing c++ socket programming... The server program binds to a socket and starts listening for connection requests...ok now how can I list the IP addreses of the listened requests? I know I can get the IP addresses after accepting the connections but lets say I don't wanna accept a connection from an specific IP address...

Answer 1

On Windows only, you can use the conditional callback feature of WinSock2's WSAAccept() function to access client information before accepting a connection, and to even reject the connection before it is accepted.

Answer 2

This can't be done in terms of the standard socket API. On all platforms I know, the system actually accepts the connection (i.e. responds with SYN+ACK TCP datagram) before the application has a chance to monitor the pending request.