Merge branch 'sane_addr_check' into 'master'

Better address sanity checks

See merge request !338

src/libknot/internal/net.c

@@ -137,7 +137,7 @@ int net_connected_socket(int type, const struct sockaddr_storage *dst_addr,
 	}
 
 	/* Bind to specific source address - if set. */
-	if (src_addr != NULL && src_addr->ss_family != AF_UNSPEC) {
+	if (sockaddr_len((const struct sockaddr *)src_addr) > 0) {
 		socket = net_bound_socket(type, src_addr);
 	} else {
 		socket = net_unbound_socket(type, dst_addr);

src/libknot/processing/requestor.c

@@ -135,6 +135,8 @@ struct knot_request *knot_request_make(mm_ctx_t *mm,
 	memcpy(&request->remote, dst, sockaddr_len(dst));
 	if (src) {
 		memcpy(&request->origin, src, sockaddr_len(src));
+	} else {
+		request->origin.ss_family = AF_UNSPEC;
 	}
 
 	request->fd = -1;