X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=8d0a0cf481ce9ca34197526ec68752785e487972;hp=309ebe4e8fb699ebc23bfaaf2561770adebd84c6;hb=035c8e14f3630424c87be520c1c296a58e67424a;hpb=5038964032ef55913b2d4741c67bf191b2208abb diff --git a/src/net.c b/src/net.c index 309ebe4e..8d0a0cf4 100644 --- a/src/net.c +++ b/src/net.c @@ -1,8 +1,9 @@ /* net.c -- most of the network code Copyright (C) 1998-2005 Ivo Timmermans, - 2000-2010 Guus Sliepen + 2000-2014 Guus Sliepen 2006 Scott Lamb + 2011 Loïc Grenié This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -40,10 +41,24 @@ #include "subnet.h" #include "xalloc.h" +#ifdef HAVE_ARPA_NAMESER_H +#include +#endif + +#ifdef HAVE_RESOLV_H +#include +#endif + bool do_purge = false; volatile bool running = false; +#ifdef HAVE_PSELECT +bool graph_dump = false; +#endif 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. */ @@ -68,16 +83,16 @@ static void purge(void) { for(snode = n->subnet_tree->head; snode; snode = snext) { snext = snode->next; s = snode->data; + send_del_subnet(everyone, s); if(!strictsubnets) - send_del_subnet(broadcast, s); - subnet_del(n, s); + subnet_del(n, s); } for(enode = n->edge_tree->head; enode; enode = enext) { enext = enode->next; e = enode->data; if(!tunnelserver) - send_del_edge(broadcast, e); + send_del_edge(everyone, e); edge_del(e); } } @@ -98,7 +113,8 @@ 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); } } @@ -126,7 +142,7 @@ static int build_fdset(fd_set *readset, fd_set *writeset) { purge(); } else { FD_SET(c->socket, readset); - if(c->outbuflen > 0) + if(c->outbuflen > 0 || c->status.connecting) FD_SET(c->socket, writeset); if(c->socket > max) max = c->socket; @@ -174,8 +190,14 @@ void terminate_connection(connection_t *c, bool report) { closesocket(c->socket); if(c->edge) { + if(!c->node) { + logger(LOG_ERR, "Connection to %s (%s) has an edge but node is NULL!", c->name, c->hostname); + // And that should never happen. + abort(); + } + if(report && !tunnelserver) - send_del_edge(broadcast, c->edge); + send_del_edge(everyone, c->edge); edge_del(c->edge); @@ -190,24 +212,26 @@ void terminate_connection(connection_t *c, bool report) { e = lookup_edge(c->node, myself); if(e) { if(!tunnelserver) - send_del_edge(broadcast, e); + send_del_edge(everyone, e); edge_del(e); } } } + free_connection_partially(c); + /* Check if this was our outgoing connection */ if(c->outgoing) { - retry_outgoing(c->outgoing); - c->outgoing = NULL; + c->status.remove = false; + do_outgoing_connection(c); } - free(c->outbuf); - c->outbuf = NULL; - c->outbuflen = 0; - c->outbufsize = 0; - c->outbufstart = 0; +#ifndef HAVE_MINGW + /* Clean up dead proxy processes */ + + while(waitpid(-1, NULL, WNOHANG) > 0); +#endif } /* @@ -226,14 +250,14 @@ static void check_dead_connections(void) { next = node->next; c = node->data; - if(c->last_ping_time + pingtimeout < now) { + if(c->last_ping_time + pingtimeout <= now) { if(c->status.active) { if(c->status.pinged) { ifdebug(CONNECTIONS) logger(LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds", - c->name, c->hostname, now - c->last_ping_time); + c->name, c->hostname, (long)now - c->last_ping_time); c->status.timeout = true; terminate_connection(c, true); - } else if(c->last_ping_time + pinginterval < now) { + } else if(c->last_ping_time + pinginterval <= now) { send_ping(c); } } else { @@ -255,11 +279,11 @@ static void check_dead_connections(void) { } } - if(c->outbuflen > 0 && c->last_flushed_time + pingtimeout < now) { + if(c->outbuflen > 0 && c->last_flushed_time + pingtimeout <= now) { if(c->status.active) { ifdebug(CONNECTIONS) logger(LOG_INFO, "%s (%s) could not flush for %ld seconds (%d bytes remaining)", - c->name, c->hostname, now - c->last_flushed_time, c->outbuflen); + c->name, c->hostname, (long)now - c->last_flushed_time, c->outbuflen); c->status.timeout = true; terminate_connection(c, true); } @@ -277,12 +301,23 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) { int result, i; socklen_t len = sizeof(result); vpn_packet_t packet; + static int errors = 0; /* check input from kernel */ if(device_fd >= 0 && FD_ISSET(device_fd, readset)) { - if(read_packet(&packet)) { - packet.priority = 0; - route(myself, &packet); + if(devops.read(&packet)) { + if(packet.len) { + 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; + } } } @@ -293,10 +328,10 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) { if(c->status.remove) continue; - if(FD_ISSET(c->socket, readset)) { + if(FD_ISSET(c->socket, writeset)) { 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); @@ -310,14 +345,14 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) { } } - if(!receive_meta(c)) { + if(!flush_meta(c)) { terminate_connection(c, c->status.active); continue; } } - if(FD_ISSET(c->socket, writeset)) { - if(!flush_meta(c)) { + if(FD_ISSET(c->socket, readset)) { + if(!receive_meta(c)) { terminate_connection(c, c->status.active); continue; } @@ -326,7 +361,7 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) { for(i = 0; i < listen_sockets; i++) { if(FD_ISSET(listen_socket[i].udp, readset)) - handle_incoming_vpn_data(listen_socket[i].udp); + handle_incoming_vpn_data(i); if(FD_ISSET(listen_socket[i].tcp, readset)) handle_new_meta_connection(listen_socket[i].tcp); @@ -338,7 +373,13 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) { */ int main_loop(void) { fd_set readset, writeset; +#ifdef HAVE_PSELECT + struct timespec tv; + sigset_t omask, block_mask; + time_t next_event; +#else struct timeval tv; +#endif int r, maxfd; time_t last_ping_check, last_config_check, last_graph_dump; event_t *event; @@ -349,21 +390,48 @@ int main_loop(void) { srand(now); +#ifdef HAVE_PSELECT + if(lookup_config(config_tree, "GraphDumpFile")) + graph_dump = true; + /* Block SIGHUP & SIGALRM */ + sigemptyset(&block_mask); + sigaddset(&block_mask, SIGHUP); + sigaddset(&block_mask, SIGALRM); + sigprocmask(SIG_BLOCK, &block_mask, &omask); +#endif + running = true; while(running) { - now = time(NULL); - - // tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */ +#ifdef HAVE_PSELECT + next_event = last_ping_check + pingtimeout; + if(graph_dump && next_event > last_graph_dump + 60) + next_event = last_graph_dump + 60; + + if((event = peek_next_event()) && next_event > event->time) + next_event = event->time; + + if(next_event <= now) + tv.tv_sec = 0; + else + tv.tv_sec = next_event - now; + tv.tv_nsec = 0; +#else tv.tv_sec = 1; tv.tv_usec = 0; +#endif maxfd = build_fdset(&readset, &writeset); #ifdef HAVE_MINGW LeaveCriticalSection(&mutex); #endif +#ifdef HAVE_PSELECT + r = pselect(maxfd + 1, &readset, &writeset, NULL, &tv, &omask); +#else r = select(maxfd + 1, &readset, &writeset, NULL, &tv); +#endif + now = time(NULL); #ifdef HAVE_MINGW EnterCriticalSection(&mutex); #endif @@ -386,7 +454,7 @@ int main_loop(void) { /* Let's check if everybody is still alive */ - if(last_ping_check + pingtimeout < now) { + if(last_ping_check + pingtimeout <= now) { check_dead_connections(); last_ping_check = now; @@ -397,7 +465,7 @@ int main_loop(void) { /* Should we regenerate our key? */ - if(keyexpires < now) { + if(keyexpires <= now) { avl_node_t *node; node_t *n; @@ -411,18 +479,42 @@ int main_loop(void) { } } - send_key_changed(broadcast, myself); + send_key_changed(); keyexpires = now + keylifetime; } + + /* 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) { avl_node_t *node; logger(LOG_INFO, "Flushing event queue"); expire_events(); +#if HAVE_DECL_RES_INIT + res_init(); +#endif for(node = connection_tree->head; node; node = node->next) { connection_t *c = node->data; - send_ping(c); + if(c->status.active) + send_ping(c); } sigalrm = false; } @@ -439,6 +531,8 @@ int main_loop(void) { struct stat s; sighup = false; + + reopenlogger(); /* Reread our own configuration file */ @@ -488,6 +582,36 @@ 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(everyone, 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(everyone, subnet); + if(subnet->owner->status.reachable) + subnet_update(subnet->owner, subnet, true); + } + } + } + /* Try to make outgoing connections */ try_outgoing_connections(); @@ -495,11 +619,16 @@ int main_loop(void) { /* Dump graph if wanted every 60 seconds*/ - if(last_graph_dump + 60 < now) { + if(last_graph_dump + 60 <= now) { dump_graph(); last_graph_dump = now; } } +#ifdef HAVE_PSELECT + /* Restore SIGHUP & SIGALARM mask */ + sigprocmask(SIG_SETMASK, &omask, NULL); +#endif + return 0; }