+static int bind_to_address(int sk, const char *interface, int family)
+{
+ struct ifaddrs *ifaddr_list, *ifaddr;
+ int size, err = -1;
+
+ if (getifaddrs(&ifaddr_list) < 0)
+ return err;
+
+ for (ifaddr = ifaddr_list; ifaddr; ifaddr = ifaddr->ifa_next) {
+ if (g_strcmp0(ifaddr->ifa_name, interface) != 0)
+ continue;
+
+ if (!ifaddr->ifa_addr ||
+ ifaddr->ifa_addr->sa_family != family)
+ continue;
+
+ switch (family) {
+ case AF_INET:
+ size = sizeof(struct sockaddr_in);
+ break;
+ case AF_INET6:
+ size = sizeof(struct sockaddr_in6);
+ break;
+ default:
+ continue;
+ }
+
+ err = bind(sk, (struct sockaddr *) ifaddr->ifa_addr, size);
+ break;
+ }
+
+ freeifaddrs(ifaddr_list);
+ return err;
+}
+
+static inline int bind_socket(int sk, int index, int family)
+{
+ char interface[IF_NAMESIZE];
+ int err;
+
+ if (!if_indextoname(index, interface))
+ return -1;
+
+ err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
+ interface, IF_NAMESIZE);
+ if (err < 0)
+ err = bind_to_address(sk, interface, family);
+
+ return err;
+}
+