time_t now = 0;
int contradicting_add_edge = 0;
int contradicting_del_edge = 0;
+static int sleeptime = 10;
/* Purge edges and subnets of unreachable nodes. Use carefully. */
/* check input from kernel */
if(device_fd >= 0 && FD_ISSET(device_fd, readset)) {
- if(read_packet(&packet)) {
+ if(devops.read(&packet)) {
errors = 0;
packet.priority = 0;
route(myself, &packet);
keyexpires = now + keylifetime;
}
- if(contradicting_del_edge > 10 && contradicting_add_edge > 10) {
- logger(LOG_WARNING, "Possible node with same Name as us!");
-
- if(rand() % 3 == 0) {
- logger(LOG_ERR, "Shutting down, check configuration of all nodes for duplicate Names!");
- running = false;
- break;
- }
-
- contradicting_add_edge = 0;
- contradicting_del_edge = 0;
+ /* Detect ADD_EDGE/DEL_EDGE storms that are caused when
+ * two tinc daemons with the same name are on the VPN.
+ * If so, sleep a while. If this happens multiple times
+ * in a row, sleep longer. */
+
+ if(contradicting_del_edge > 100 && contradicting_add_edge > 100) {
+ logger(LOG_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", sleeptime);
+ usleep(sleeptime * 1000000LL);
+ sleeptime *= 2;
+ if(sleeptime < 0)
+ sleeptime = 3600;
+ } else {
+ sleeptime /= 2;
+ if(sleeptime < 10)
+ sleeptime = 10;
}
+
+ contradicting_add_edge = 0;
+ contradicting_del_edge = 0;
}
if(sigalrm) {