X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=1b3d230eb4dff87b40d3e945016f9f783a3cfb71;hp=d43aede4e1a45de1013129d635ebaf26f1297fc4;hb=fe84fafcb684391739a1b3366705c58683210392;hpb=e449d94caef963809d417f16497f6f978e10d731 diff --git a/src/net.c b/src/net.c index d43aede4..1b3d230e 100644 --- a/src/net.c +++ b/src/net.c @@ -1,7 +1,7 @@ /* net.c -- most of the network code - Copyright (C) 1998-2003 Ivo Timmermans , - 2000-2003 Guus Sliepen + Copyright (C) 1998-2004 Ivo Timmermans , + 2000-2004 Guus Sliepen 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 @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net.c,v 1.35.4.191 2003/07/17 15:06:26 guus Exp $ + $Id$ */ #include "system.h" @@ -39,10 +39,10 @@ #include "protocol.h" #include "route.h" #include "subnet.h" +#include "xalloc.h" -int do_purge = 0; -int sighup = 0; -int sigalrm = 0; +bool do_purge = false; +volatile bool running = false; time_t now = 0; @@ -59,9 +59,11 @@ static void purge(void) ifdebug(PROTOCOL) logger(LOG_DEBUG, _("Purging unreachable nodes")); + /* Remove all edges and subnets owned by unreachable nodes. */ + for(nnode = node_tree->head; nnode; nnode = nnext) { nnext = nnode->next; - n = (node_t *) nnode->data; + n = nnode->data; if(!n->status.reachable) { ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Purging node %s (%s)"), n->name, @@ -69,19 +71,39 @@ static void purge(void) for(snode = n->subnet_tree->head; snode; snode = snext) { snext = snode->next; - s = (subnet_t *) snode->data; - send_del_subnet(broadcast, s); + s = snode->data; + if(!tunnelserver) + send_del_subnet(broadcast, s); subnet_del(n, s); } for(enode = n->edge_tree->head; enode; enode = enext) { enext = enode->next; - e = (edge_t *) enode->data; - send_del_edge(broadcast, e); + e = enode->data; + if(!tunnelserver) + send_del_edge(broadcast, e); edge_del(e); } + } + } + + /* Check if anyone else claims to have an edge to an unreachable node. If not, delete node. */ + + for(nnode = node_tree->head; nnode; nnode = nnext) { + nnext = nnode->next; + n = nnode->data; + + if(!n->status.reachable) { + for(enode = edge_weight_tree->head; enode; enode = enext) { + enext = enode->next; + e = enode->data; + + if(e->to == n) + break; + } - node_del(n); + if(!enode) + node_del(n); } } } @@ -102,7 +124,7 @@ static int build_fdset(fd_set * fs) for(node = connection_tree->head; node; node = next) { next = node->next; - c = (connection_t *) node->data; + c = node->data; if(c->status.remove) { connection_del(c); @@ -134,11 +156,11 @@ static int build_fdset(fd_set * fs) /* Terminate a connection: - Close the socket - - Remove associated edge and tell other connections about it if report = 1 + - Remove associated edge and tell other connections about it if report = true - Check if we need to retry making an outgoing connection - Deactivate the host */ -void terminate_connection(connection_t *c, int report) +void terminate_connection(connection_t *c, bool report) { cp(); @@ -148,17 +170,17 @@ void terminate_connection(connection_t *c, int report) ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Closing connection with %s (%s)"), c->name, c->hostname); - c->status.remove = 1; - c->status.active = 0; + c->status.remove = true; + c->status.active = false; if(c->node) c->node->connection = NULL; if(c->socket) - close(c->socket); + closesocket(c->socket); if(c->edge) { - if(report) + if(report && !tunnelserver) send_del_edge(broadcast, c->edge); edge_del(c->edge); @@ -166,6 +188,18 @@ void terminate_connection(connection_t *c, int report) /* Run MST and SSSP algorithms */ graph(); + + /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */ + + if(report && !c->node->status.reachable) { + edge_t *e; + e = lookup_edge(c->node, myself); + if(e) { + if(!tunnelserver) + send_del_edge(broadcast, e); + edge_del(e); + } + } } /* Check if this was our outgoing connection */ @@ -193,28 +227,34 @@ static void check_dead_connections(void) for(node = connection_tree->head; node; node = next) { next = node->next; - c = (connection_t *) node->data; + c = node->data; 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"), c->name, c->hostname); - c->status.timeout = 1; - terminate_connection(c, 1); + c->status.timeout = true; + terminate_connection(c, true); } else { send_ping(c); } } else { if(c->status.remove) { logger(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."), - c->name, c->hostname, c->status); + c->name, c->hostname, *(uint32_t *)&c->status); connection_del(c); continue; } ifdebug(CONNECTIONS) logger(LOG_WARNING, _("Timeout from %s (%s) during authentication"), c->name, c->hostname); - terminate_connection(c, 0); + if(c->status.connecting) { + c->status.connecting = false; + closesocket(c->socket); + do_outgoing_connection(c); + } else { + terminate_connection(c, false); + } } } } @@ -235,19 +275,19 @@ static void check_network_activity(fd_set * f) cp(); if(FD_ISSET(device_fd, f)) { - if(!read_packet(&packet)) - route_outgoing(&packet); + if(read_packet(&packet)) + route(myself, &packet); } for(node = connection_tree->head; node; node = node->next) { - c = (connection_t *) node->data; + c = node->data; if(c->status.remove) continue; if(FD_ISSET(c->socket, f)) { if(c->status.connecting) { - c->status.connecting = 0; + c->status.connecting = false; getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len); if(!result) @@ -256,13 +296,13 @@ static void check_network_activity(fd_set * f) ifdebug(CONNECTIONS) logger(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result)); - close(c->socket); + closesocket(c->socket); do_outgoing_connection(c); continue; } } - if(receive_meta(c) < 0) { + if(!receive_meta(c)) { terminate_connection(c, c->status.active); continue; } @@ -281,7 +321,7 @@ static void check_network_activity(fd_set * f) /* this is where it all happens... */ -void main_loop(void) +int main_loop(void) { fd_set fset; struct timeval tv; @@ -295,10 +335,13 @@ void main_loop(void) last_config_check = now; srand(now); - for(;;) { + running = true; + + while(running) { now = time(NULL); - tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */ + // tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */ + tv.tv_sec = 1; tv.tv_usec = 0; maxfd = build_fdset(&fset); @@ -311,7 +354,7 @@ void main_loop(void) strerror(errno)); cp_trace(); dump_connections(); - return; + return 1; } continue; @@ -321,7 +364,7 @@ void main_loop(void) if(do_purge) { purge(); - do_purge = 0; + do_purge = false; } /* Let's check if everybody is still alive */ @@ -331,7 +374,7 @@ void main_loop(void) last_ping_check = now; if(routing_mode == RMODE_SWITCH) - age_mac(); + age_subnets(); age_past_requests(); @@ -341,7 +384,8 @@ void main_loop(void) ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key")); RAND_pseudo_bytes(myself->key, myself->keylength); - EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len); + if(myself->cipher) + EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len); send_key_changed(broadcast, myself); keyexpires = now + keylifetime; } @@ -357,11 +401,11 @@ void main_loop(void) logger(LOG_INFO, _("Flushing event queue")); while(event_tree->head) { - event = (event_t *) event_tree->head->data; + event = event_tree->head->data; event->handler(event->data); event_del(event); } - sigalrm = 0; + sigalrm = false; } if(sighup) { @@ -370,22 +414,22 @@ void main_loop(void) char *fname; struct stat s; - sighup = 0; + sighup = false; /* Reread our own configuration file */ exit_configuration(&config_tree); init_configuration(&config_tree); - if(read_server_config()) { + if(!read_server_config()) { logger(LOG_ERR, _("Unable to reread configuration file, exitting.")); - exit(1); + return 1; } /* Close connections to hosts that have a changed or deleted host config file */ for(node = connection_tree->head; node; node = node->next) { - c = (connection_t *) node->data; + c = node->data; if(c->outgoing) { free(c->outgoing->name); @@ -405,8 +449,8 @@ void main_loop(void) /* Try to make outgoing connections */ try_outgoing_connections(); - - continue; } } + + return 0; }