Extracting IP Address and Port Info from sockaddr_storage

Assuming for IPv4.

After taking the address of your sockaddr_storage or sockaddr structure and casting it to the IPv4 version sockaddr_in, you can then access the individual bytes of the IPv4 address.

struct sockaddr_in *sin = (struct sockaddr_in *)&their_addr;

Then you can take address of the s_addr member which is a 32 bit value (in_addr_t) that holds the 4 bytes of the ip address (in network byte order) and cast it to a pointer to an unsigned char which then lets you access the individual bytes of the value.

unsigned char *ip = (unsigned char *)&sin->sin_addr.s_addr;

printf("%d %d %d %d\n", ip[0], ip[1], ip[2], ip[3]);

You want to probably use getnameinfo() function:

int getnameinfo(const struct sockaddr *sa, socklen_t salen,
                   char *host, size_t hostlen,
                   char *serv, size_t servlen, int flags);

E.g.:

struct sockaddr_storage client_addr;
socklen_t client_len = sizeof(struct sockaddr_storage);

/* Accept client request */
int client_socket = accept(server_socket, 
    (struct sockaddr *)&client_addr, &client_len);

char hoststr[NI_MAXHOST];
char portstr[NI_MAXSERV];

int rc = getnameinfo((struct sockaddr *)&client_addr, 
    client_len, hoststr, sizeof(hoststr), portstr, sizeof(portstr), 
    NI_NUMERICHOST | NI_NUMERICSERV);

if (rc == 0) 
    printf("New connection from %s %s", hoststr, portstr);