/**
* Fill `p_addr' with socket's remote address/port information.
*/
int
socket_addr_getpeername(socket_addr_t *p_addr, int fd)
{
socklen_t addr_len;
g_return_val_if_fail(p_addr, -1);
g_return_val_if_fail(fd >= 0, -1);
errno = 0;
addr_len = socket_addr_init(p_addr, NET_TYPE_IPV4);
if (
-1 != getpeername(fd, socket_addr_get_sockaddr(p_addr), &addr_len) &&
AF_INET == socket_addr_get_family(p_addr)
) {
return 0;
}
#ifdef HAS_IPV6
errno = 0;
addr_len = socket_addr_init(p_addr, NET_TYPE_IPV6);
if (
-1 != getpeername(fd, socket_addr_get_sockaddr(p_addr), &addr_len) &&
AF_INET6 == socket_addr_get_family(p_addr)
) {
return 0;
}
#endif /* HAS_IPV6 */
return -1;
}
/**
* Resolves an IP address to a hostname per DNS.
*
* @param ha The host address to resolve.
* @return On success, the hostname is returned. Otherwise, NULL is
* returned. The resulting string points to a static buffer.
*/
const char *
host_addr_to_name(host_addr_t addr)
{
socket_addr_t sa;
if (host_addr_can_convert(addr, NET_TYPE_IPV4)) {
(void) host_addr_convert(addr, &addr, NET_TYPE_IPV4);
}
if (0 == socket_addr_set(&sa, addr, 0)) {
return NULL;
}
#ifdef HAS_GETNAMEINFO
{
static char host[1025];
int error;
error = getnameinfo(socket_addr_get_const_sockaddr(&sa),
socket_addr_get_len(&sa), host, sizeof host, NULL, 0, 0);
if (error) {
char buf[HOST_ADDR_BUFLEN];
host_addr_to_string_buf(addr, buf, sizeof buf);
g_message("getnameinfo() failed for \"%s\": %s",
buf, gai_strerror(error));
return NULL;
}
return host;
}
#else /* !HAS_GETNAMEINFO */
{
const struct hostent *he;
socklen_t len = 0;
const char *ptr = NULL;
switch (host_addr_net(addr)) {
case NET_TYPE_IPV4:
ptr = cast_to_gchar_ptr(&sa.inet4.sin_addr);
len = sizeof sa.inet4.sin_addr;
break;
case NET_TYPE_IPV6:
#ifdef HAS_IPV6
ptr = cast_to_gchar_ptr(&sa.inet6.sin6_addr);
len = sizeof sa.inet6.sin6_addr;
break;
#endif /* HAS_IPV6 */
case NET_TYPE_LOCAL:
case NET_TYPE_NONE:
return NULL;
}
g_return_val_if_fail(ptr, NULL);
g_return_val_if_fail(0 != len, NULL);
he = gethostbyaddr(ptr, len, socket_addr_get_family(&sa));
if (!he) {
char buf[HOST_ADDR_BUFLEN];
host_addr_to_string_buf(addr, buf, sizeof buf);
gethostbyname_error(buf);
return NULL;
}
return he->h_name;
}
#endif /* HAS_GETNAMEINFO */
}
