+ char *from_address, *from_port;
+ /* If we're the originator, the address we use is irrelevant
+ because the first intermediate node will ignore it.
+ We use our local address as it somewhat makes sense
+ and it's simpler than introducing an encoding for "null" addresses anyway. */
+ sockaddr2str((from != myself) ? &from->address : &to->nexthop->connection->edge->local_address, &from_address, &from_port);
+
+ bool x = send_request(to->nexthop->connection, "%d %s %s %s %s", UDP_INFO, from->name, to->name, from_address, from_port);
+
+ free(from_address);
+ free(from_port);
+
+ if(from == myself) {
+ to->udp_info_sent = now;
+ }
+
+ return x;
+}
+
+bool udp_info_h(connection_t *c, const char *request) {
+ char from_name[MAX_STRING_SIZE];
+ char to_name[MAX_STRING_SIZE];
+ char from_address[MAX_STRING_SIZE];
+ char from_port[MAX_STRING_SIZE];
+
+ if(sscanf(request, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING, from_name, to_name, from_address, from_port) != 4) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "UDP_INFO", c->name, c->hostname);
+ return false;
+ }
+
+ if(!check_id(from_name) || !check_id(to_name)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "UDP_INFO", c->name, c->hostname, "invalid name");
+ return false;
+ }
+
+ node_t *from = lookup_node(from_name);
+
+ if(!from) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list", "UDP_INFO", c->name, c->hostname, from_name);
+ return true;
+ }
+
+ if(from != from->via) {
+ /* Not supposed to happen, as it means the message wandered past a static relay */
+ logger(DEBUG_PROTOCOL, LOG_WARNING, "Got UDP info message from %s (%s) which we can't reach directly", from->name, from->hostname);
+ return true;
+ }
+
+ /* If we have a direct edge to "from", we are in a better position
+ to guess its address than it is itself. */
+ if(!from->connection && !from->status.udp_confirmed) {
+ sockaddr_t from_addr = str2sockaddr(from_address, from_port);
+
+ if(sockaddrcmp(&from_addr, &from->address)) {
+ update_node_udp(from, &from_addr);
+ }
+ }
+
+ node_t *to = lookup_node(to_name);
+
+ if(!to) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list", "UDP_INFO", c->name, c->hostname, to_name);
+ return true;
+ }
+
+ /* Send our own data (which could be what we just received) up the chain. */
+
+ return send_udp_info(from, to);