Quit when there are too many consecutive errors on the tun/tap device.

[oweals/tinc.git] / src / net.c

diff --git a/src/net.c b/src/net.c
index 59dd39b30c327b8f15f5deb6360148a043deb466..bed779a5c50b3ef78abdd5a29a40bfc5b1822540 100644 (file)
--- a/src/net.c
+++ b/src/net.c
@@ -1,7 +1,7 @@
 /*
     net.c -- most of the network code
     Copyright (C) 1998-2005 Ivo Timmermans,
-                  2000-2009 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2010 Guus Sliepen <guus@tinc-vpn.org>
                   2006      Scott Lamb <slamb@slamb.org>
 
     This program is free software; you can redistribute it and/or modify
@@ -44,6 +44,8 @@ bool do_purge = false;
 volatile bool running = false;
 
 time_t now = 0;
+int contradicting_add_edge = 0;
+int contradicting_del_edge = 0;
 
 /* Purge edges and subnets of unreachable nodes. Use carefully. */
 
@@ -68,9 +70,9 @@ static void purge(void) {
                        for(snode = n->subnet_tree->head; snode; snode = snext) {
                                snext = snode->next;
                                s = snode->data;
-                               if(!tunnelserver)
-                                       send_del_subnet(broadcast, s);
-                               subnet_del(n, s);
+                               send_del_subnet(broadcast, s);
+                               if(!strictsubnets)
+                                       subnet_del(n, s);
                        }
 
                        for(enode = n->edge_tree->head; enode; enode = enext) {
@@ -98,7 +100,8 @@ static void purge(void) {
                                        break;
                        }
 
-                       if(!enode)
+                       if(!enode && (!strictsubnets || !n->subnet_tree->head))
+                               /* in strictsubnets mode do not delete nodes with subnets */
                                node_del(n);
                }
        }
@@ -277,12 +280,21 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) {
        int result, i;
        socklen_t len = sizeof(result);
        vpn_packet_t packet;
+       int errors = 0;
 
        /* check input from kernel */
        if(device_fd >= 0 && FD_ISSET(device_fd, readset)) {
                if(read_packet(&packet)) {
+                       errors = 0;
                        packet.priority = 0;
                        route(myself, &packet);
+               } else {
+                       usleep(errors * 50000);
+                       errors++;
+                       if(errors > 10) {
+                               logger(LOG_ERR, "Too many errors from %s, exiting!", device);
+                               running = false;
+                       }
                }
        }
 
@@ -296,14 +308,14 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) {
                if(FD_ISSET(c->socket, readset)) {
                        if(c->status.connecting) {
                                c->status.connecting = false;
-                               getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+                               getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
 
                                if(!result)
                                        finish_connecting(c);
                                else {
                                        ifdebug(CONNECTIONS) logger(LOG_DEBUG,
                                                           "Error while connecting to %s (%s): %s",
-                                                          c->name, c->hostname, strerror(result));
+                                                          c->name, c->hostname, sockstrerror(result));
                                        closesocket(c->socket);
                                        do_outgoing_connection(c);
                                        continue;
@@ -369,17 +381,15 @@ int main_loop(void) {
 #endif
 
                if(r < 0) {
-                       if(errno != EINTR && errno != EAGAIN) {
-                               logger(LOG_ERR, "Error while waiting for input: %s",
-                                          strerror(errno));
+                       if(!sockwouldblock(sockerrno)) {
+                               logger(LOG_ERR, "Error while waiting for input: %s", sockstrerror(sockerrno));
                                dump_connections();
                                return 1;
                        }
-
-                       continue;
                }
 
-               check_network_activity(&readset, &writeset);
+               if(r > 0)
+                       check_network_activity(&readset, &writeset);
 
                if(do_purge) {
                        purge();
@@ -416,11 +426,29 @@ int main_loop(void) {
                                send_key_changed(broadcast, myself);
                                keyexpires = now + keylifetime;
                        }
+
+                       if(contradicting_del_edge && contradicting_add_edge) {
+                               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;
+                       }
                }
 
                if(sigalrm) {
+                       avl_node_t *node;
                        logger(LOG_INFO, "Flushing event queue");
                        expire_events();
+                       for(node = connection_tree->head; node; node = node->next) {
+                               connection_t *c = node->data;
+                               send_ping(c);
+                       }
                        sigalrm = false;
                }
 
@@ -485,6 +513,36 @@ int main_loop(void) {
 
                        last_config_check = now;
 
+                       /* If StrictSubnet is set, expire deleted Subnets and read new ones in */
+
+                       if(strictsubnets) {
+                               subnet_t *subnet;
+
+                               for(node = subnet_tree->head; node; node = node->next) {
+                                       subnet = node->data;
+                                       subnet->expires = 1;
+                               }
+
+                               load_all_subnets();
+
+                               for(node = subnet_tree->head; node; node = next) {
+                                       next = node->next;
+                                       subnet = node->data;
+                                       if(subnet->expires == 1) {
+                                               send_del_subnet(broadcast, subnet);
+                                               if(subnet->owner->status.reachable)
+                                                       subnet_update(subnet->owner, subnet, false);
+                                               subnet_del(subnet->owner, subnet);
+                                       } else if(subnet->expires == -1) {
+                                               subnet->expires = 0;
+                                       } else {
+                                               send_add_subnet(broadcast, subnet);
+                                               if(subnet->owner->status.reachable)
+                                                       subnet_update(subnet->owner, subnet, true);
+                                       }
+                               }
+                       }
+
                        /* Try to make outgoing connections */
                        
                        try_outgoing_connections();