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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?
945
If it's a server socket, you should call listen() on your socket, and then getsockname() to find the port number on which it is listening: struct sockaddr_in sin; socklen_t len = sizeof(sin); if (getsockname(sock, (struct sockaddr *)&sin, &len) == -1) perror("getsockname"); else printf("port number %d\n", ntohs(sin.
A socket consists of the IP address of a system and the port number of a program within the system. The IP address corresponds to the system and the port number corresponds to the program where the data needs to be sent: Sockets can be classified into three categories: stream, datagram, and raw socket.
After the client establishes a successful connection to the server, the IP address of the client will be printed on the server console.
A socket address is defined by the IP address of the socket and the port number allocated to the socket.
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); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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