如何使用WinSock2和C获取连接的客户端的IP地址？

Question

I want to get the IP address of the client who's just connected into my server running WinSock2. I'm using C.

Answer 1

You could get the client's IP-address and port via the call to accept() .

Just pass in the appropriate data into the last two parameters.

struct sockaddr_in sa = {0}; /* for TCP/IP */
socklen_t socklen = sizeof sa;
... = accept(..., (struct sockaddr *) &sa, &socklen);

For details please read here .

Answer 2

Have not done it myself, but take a look at getpeername . Looks like this is what you need.

Answer 3

This work for me on winsock2 . No need of getpeername

SOCKET newConnection;
SOCKADDR_IN addr;
int addrlen = sizeof(addr);

newConnection = accept(sListen, (SOCKADDR*)&addr, &addrlen);

char *ip = inet_ntoa(addr.sin_addr);
printf("Accepted Connection from :  %s", ip);