Question

In socket prgramming in “C” how do I find out the IP address of the Client who is connecting to the Server? How can the server get the client’s IP address?

Answer 1

You didn’t mention any API, but the accept function/system call generally accepts a sockaddr * argument where it stores the address of the peer.

int accept(int socket, struct sockaddr *restrict address, /* <---- */
       socklen_t *restrict address_len);

Alternatively you can use getpeername to retrieve the same address at a later time.

int getpeername(int socket, struct sockaddr *restrict address,
       socklen_t *restrict address_len);

If you happen to use winapi: accept, getpeername.