+int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
+{
+ int r;
+ struct ifreq ifr;
+ strncpy_IFNAMSIZ(ifr.ifr_name, iface);
+ /* NB: passing (iface, strlen(iface) + 1) does not work!
+ * (maybe it works on _some_ kernels, but not on 2.6.26)
+ * Actually, ifr_name is at offset 0, and in practice
+ * just giving char[IFNAMSIZ] instead of struct ifreq works too.
+ * But just in case it's not true on some obscure arch... */
+ r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
+ if (r)
+ bb_perror_msg("can't bind to interface %s", iface);
+ return r;
+}
+
+len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
+{
+ len_and_sockaddr lsa;
+ len_and_sockaddr *lsa_ptr;
+
+ lsa.len = LSA_SIZEOF_SA;
+ if (getsockname(fd, &lsa.u.sa, &lsa.len) != 0)
+ return NULL;
+
+ lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
+ if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
+ lsa_ptr->len = lsa.len;
+ getsockname(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
+ } else {
+ memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
+ }
+ return lsa_ptr;
+}