Getting the source address of an incoming socket connection

Question

I have a server with a incoming socket from a client. I need the get the IP address of the remote client. Tried searching google for in_addr but it's a bit troublesome. Any suggestions?

Answer 1

You need the getpeername function:

// assume s is a connected socket  socklen_t len; struct sockaddr_storage addr; char ipstr[INET6_ADDRSTRLEN]; int port;  len = sizeof addr; getpeername(s, (struct sockaddr*)&addr, &len);  // deal with both IPv4 and IPv6: if (addr.ss_family == AF_INET) {     struct sockaddr_in *s = (struct sockaddr_in *)&addr;     port = ntohs(s->sin_port);     inet_ntop(AF_INET, &s->sin_addr, ipstr, sizeof ipstr); } else { // AF_INET6     struct sockaddr_in6 *s = (struct sockaddr_in6 *)&addr;     port = ntohs(s->sin6_port);     inet_ntop(AF_INET6, &s->sin6_addr, ipstr, sizeof ipstr); }  printf("Peer IP address: %s\n", ipstr);