2000-03-26 00:33:07 +00:00
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/*
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net.c -- most of the network code
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2006-04-26 13:52:58 +00:00
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Copyright (C) 1998-2005 Ivo Timmermans,
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2011-05-08 19:22:20 +00:00
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2000-2011 Guus Sliepen <guus@tinc-vpn.org>
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2009-09-25 19:14:56 +00:00
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2006 Scott Lamb <slamb@slamb.org>
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2011-06-04 09:27:54 +00:00
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2011 Loïc Grenié <loic.grenie@gmail.com>
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2000-03-26 00:33:07 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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2009-09-24 22:01:00 +00:00
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2000-03-26 00:33:07 +00:00
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*/
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2003-07-17 15:06:27 +00:00
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#include "system.h"
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2000-11-15 01:06:13 +00:00
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2003-07-17 15:06:27 +00:00
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#include "utils.h"
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2007-05-18 10:05:26 +00:00
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#include "splay_tree.h"
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2002-02-18 16:25:19 +00:00
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#include "conf.h"
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#include "connection.h"
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2003-07-17 15:06:27 +00:00
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#include "device.h"
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#include "graph.h"
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#include "logger.h"
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2002-02-18 16:25:19 +00:00
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#include "meta.h"
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#include "net.h"
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#include "netutl.h"
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#include "process.h"
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#include "protocol.h"
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2003-07-17 15:06:27 +00:00
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#include "subnet.h"
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2003-07-29 22:59:01 +00:00
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#include "xalloc.h"
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2000-03-26 00:33:07 +00:00
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2010-06-04 12:53:52 +00:00
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int contradicting_add_edge = 0;
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int contradicting_del_edge = 0;
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2011-07-16 13:21:37 +00:00
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static int sleeptime = 10;
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2002-03-01 14:09:31 +00:00
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2002-09-04 13:48:52 +00:00
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/* Purge edges and subnets of unreachable nodes. Use carefully. */
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2002-02-10 21:57:54 +00:00
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2007-11-07 02:49:57 +00:00
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void purge(void) {
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2007-05-18 10:05:26 +00:00
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splay_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
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2002-09-09 21:25:28 +00:00
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node_t *n;
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edge_t *e;
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subnet_t *s;
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2009-09-24 22:54:07 +00:00
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ifdebug(PROTOCOL) logger(LOG_DEBUG, "Purging unreachable nodes");
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2002-09-09 21:25:28 +00:00
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2003-08-22 15:04:26 +00:00
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/* Remove all edges and subnets owned by unreachable nodes. */
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2002-09-09 21:25:28 +00:00
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for(nnode = node_tree->head; nnode; nnode = nnext) {
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nnext = nnode->next;
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2003-08-28 21:05:11 +00:00
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n = nnode->data;
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2002-09-09 21:25:28 +00:00
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if(!n->status.reachable) {
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2009-09-24 22:54:07 +00:00
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ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Purging node %s (%s)", n->name,
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2002-09-09 21:25:28 +00:00
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n->hostname);
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for(snode = n->subnet_tree->head; snode; snode = snext) {
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snext = snode->next;
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2003-08-28 21:05:11 +00:00
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s = snode->data;
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2012-02-20 16:12:48 +00:00
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send_del_subnet(everyone, s);
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2010-03-01 23:18:44 +00:00
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if(!strictsubnets)
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2010-03-10 01:50:51 +00:00
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subnet_del(n, s);
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2002-09-09 21:25:28 +00:00
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}
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for(enode = n->edge_tree->head; enode; enode = enext) {
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enext = enode->next;
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2003-08-28 21:05:11 +00:00
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e = enode->data;
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2003-11-17 15:30:18 +00:00
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if(!tunnelserver)
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2012-02-20 16:12:48 +00:00
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send_del_edge(everyone, e);
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2002-09-09 21:25:28 +00:00
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edge_del(e);
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}
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2003-08-22 15:04:26 +00:00
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}
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}
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/* Check if anyone else claims to have an edge to an unreachable node. If not, delete node. */
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for(nnode = node_tree->head; nnode; nnode = nnext) {
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nnext = nnode->next;
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2003-08-28 21:05:11 +00:00
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n = nnode->data;
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2003-08-22 15:04:26 +00:00
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if(!n->status.reachable) {
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for(enode = edge_weight_tree->head; enode; enode = enext) {
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enext = enode->next;
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2003-08-28 21:05:11 +00:00
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e = enode->data;
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2003-08-22 15:04:26 +00:00
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if(e->to == n)
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break;
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}
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2002-09-09 21:25:28 +00:00
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2010-03-10 01:50:51 +00:00
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if(!enode && (!strictsubnets || !n->subnet_tree->head))
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/* in strictsubnets mode do not delete nodes with subnets */
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2003-08-22 15:04:26 +00:00
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node_del(n);
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2002-09-09 21:25:28 +00:00
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}
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}
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2002-02-10 21:57:54 +00:00
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}
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2000-03-26 00:33:07 +00:00
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/*
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2001-07-20 20:25:10 +00:00
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Terminate a connection:
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2001-10-30 16:34:32 +00:00
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- Close the socket
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2003-07-22 20:55:21 +00:00
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- Remove associated edge and tell other connections about it if report = true
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2001-10-30 16:34:32 +00:00
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- Check if we need to retry making an outgoing connection
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2001-07-20 20:25:10 +00:00
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- Deactivate the host
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2000-03-26 00:33:07 +00:00
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*/
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2007-05-18 10:00:00 +00:00
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void terminate_connection(connection_t *c, bool report) {
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2009-09-24 22:54:07 +00:00
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ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Closing connection with %s (%s)",
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2002-09-09 21:25:28 +00:00
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c->name, c->hostname);
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2001-10-30 16:34:32 +00:00
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2003-07-22 20:55:21 +00:00
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c->status.active = false;
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2002-03-27 14:02:36 +00:00
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2002-09-09 21:25:28 +00:00
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if(c->node)
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c->node->connection = NULL;
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2002-09-04 13:48:52 +00:00
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2002-09-09 21:25:28 +00:00
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if(c->edge) {
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2003-11-17 15:30:18 +00:00
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if(report && !tunnelserver)
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2012-02-20 16:12:48 +00:00
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send_del_edge(everyone, c->edge);
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2002-02-10 21:57:54 +00:00
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2002-09-09 21:25:28 +00:00
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edge_del(c->edge);
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2002-09-04 13:48:52 +00:00
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2002-09-09 21:25:28 +00:00
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/* Run MST and SSSP algorithms */
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2002-09-04 13:48:52 +00:00
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2002-09-09 21:25:28 +00:00
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graph();
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2003-08-28 15:27:12 +00:00
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/* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
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if(report && !c->node->status.reachable) {
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edge_t *e;
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e = lookup_edge(c->node, myself);
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if(e) {
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2003-11-17 15:30:18 +00:00
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if(!tunnelserver)
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2012-02-20 16:12:48 +00:00
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send_del_edge(everyone, e);
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2003-08-28 15:27:12 +00:00
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edge_del(e);
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}
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}
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2002-09-09 21:25:28 +00:00
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}
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2002-09-03 20:43:26 +00:00
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2002-09-09 21:25:28 +00:00
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/* Check if this was our outgoing connection */
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2001-10-30 16:34:32 +00:00
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2007-05-19 13:34:32 +00:00
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if(c->outgoing)
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2002-09-09 21:25:28 +00:00
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retry_outgoing(c->outgoing);
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2007-05-19 13:34:32 +00:00
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connection_del(c);
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2000-03-26 00:33:07 +00:00
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}
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/*
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2000-05-14 13:02:20 +00:00
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Check if the other end is active.
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If we have sent packets, but didn't receive any,
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then possibly the other end is dead. We send a
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PING request over the meta connection. If the other
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end does not reply in time, we consider them dead
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and close the connection.
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2000-03-26 00:33:07 +00:00
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*/
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2007-05-18 10:00:00 +00:00
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static void timeout_handler(int fd, short events, void *event) {
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2007-05-18 10:05:26 +00:00
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splay_node_t *node, *next;
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2002-09-09 21:25:28 +00:00
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connection_t *c;
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2007-05-18 09:34:06 +00:00
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time_t now = time(NULL);
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2002-09-09 21:25:28 +00:00
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for(node = connection_tree->head; node; node = next) {
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next = node->next;
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2003-08-28 21:05:11 +00:00
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c = node->data;
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2002-09-09 21:25:28 +00:00
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2011-06-04 07:05:23 +00:00
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if(c->last_ping_time + pingtimeout <= now) {
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2002-09-09 21:25:28 +00:00
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if(c->status.active) {
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if(c->status.pinged) {
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2009-09-24 22:54:07 +00:00
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ifdebug(CONNECTIONS) logger(LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds",
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2006-01-19 17:13:18 +00:00
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c->name, c->hostname, now - c->last_ping_time);
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2003-07-22 20:55:21 +00:00
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terminate_connection(c, true);
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2007-05-19 12:07:30 +00:00
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continue;
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2011-06-04 07:05:23 +00:00
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} else if(c->last_ping_time + pinginterval <= now) {
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2002-09-09 21:25:28 +00:00
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send_ping(c);
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}
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} else {
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2004-06-21 14:37:52 +00:00
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if(c->status.connecting) {
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2007-05-19 13:34:32 +00:00
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ifdebug(CONNECTIONS)
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2009-09-29 12:55:29 +00:00
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logger(LOG_WARNING, "Timeout while connecting to %s (%s)", c->name, c->hostname);
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2004-06-21 14:37:52 +00:00
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c->status.connecting = false;
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closesocket(c->socket);
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do_outgoing_connection(c);
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} else {
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2009-09-29 12:55:29 +00:00
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ifdebug(CONNECTIONS) logger(LOG_WARNING, "Timeout from %s (%s) during authentication", c->name, c->hostname);
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2004-06-21 14:37:52 +00:00
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terminate_connection(c, false);
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2007-05-19 12:07:30 +00:00
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continue;
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2004-06-21 14:37:52 +00:00
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}
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2002-09-09 21:25:28 +00:00
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}
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}
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}
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2007-05-18 09:43:52 +00:00
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2011-07-16 13:21:37 +00:00
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if(contradicting_del_edge > 100 && contradicting_add_edge > 100) {
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logger(LOG_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", sleeptime);
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2011-07-16 20:38:22 +00:00
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usleep(sleeptime * 1000000LL);
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2011-07-16 13:21:37 +00:00
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sleeptime *= 2;
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if(sleeptime < 0)
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sleeptime = 3600;
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} else {
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sleeptime /= 2;
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if(sleeptime < 10)
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sleeptime = 10;
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2010-11-12 15:15:29 +00:00
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}
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2002-09-09 21:25:28 +00:00
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2011-07-16 13:21:37 +00:00
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contradicting_add_edge = 0;
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contradicting_del_edge = 0;
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2007-05-18 09:43:52 +00:00
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event_add(event, &(struct timeval){pingtimeout, 0});
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2000-03-26 00:33:07 +00:00
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}
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2007-05-18 10:00:00 +00:00
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void handle_meta_connection_data(int fd, short events, void *data) {
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2007-02-27 01:57:01 +00:00
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connection_t *c = data;
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int result;
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2008-12-11 15:56:18 +00:00
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socklen_t len = sizeof result;
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2002-09-09 21:25:28 +00:00
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2007-05-17 20:20:10 +00:00
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if(c->status.connecting) {
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2007-05-19 13:34:32 +00:00
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c->status.connecting = false;
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2007-05-17 20:20:10 +00:00
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getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
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if(!result)
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finish_connecting(c);
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else {
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ifdebug(CONNECTIONS) logger(LOG_DEBUG,
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2009-09-29 12:55:29 +00:00
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"Error while connecting to %s (%s): %s",
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2009-11-02 13:24:27 +00:00
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c->name, c->hostname, sockstrerror(result));
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2007-05-17 20:20:10 +00:00
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closesocket(c->socket);
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do_outgoing_connection(c);
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2007-02-27 01:57:01 +00:00
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return;
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2006-01-19 17:13:18 +00:00
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}
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2002-09-09 21:25:28 +00:00
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}
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2007-05-17 20:20:10 +00:00
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if (!receive_meta(c)) {
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terminate_connection(c, c->status.active);
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return;
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2002-09-09 21:25:28 +00:00
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}
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2001-10-30 16:34:32 +00:00
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}
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2007-05-17 22:41:34 +00:00
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static void sigterm_handler(int signal, short events, void *data) {
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2009-09-29 12:55:29 +00:00
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logger(LOG_NOTICE, "Got %s signal", strsignal(signal));
|
2007-05-17 22:41:34 +00:00
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event_loopexit(NULL);
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}
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static void sighup_handler(int signal, short events, void *data) {
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2009-09-29 12:55:29 +00:00
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logger(LOG_NOTICE, "Got %s signal", strsignal(signal));
|
2011-06-06 19:19:30 +00:00
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reopenlogger();
|
2007-11-07 02:51:24 +00:00
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reload_configuration();
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}
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|
2011-06-25 18:20:07 +00:00
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static void sigalrm_handler(int signal, short events, void *data) {
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logger(LOG_NOTICE, "Got %s signal", strsignal(signal));
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retry();
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}
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|
2007-11-07 02:51:24 +00:00
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int reload_configuration(void) {
|
2007-05-17 21:34:58 +00:00
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connection_t *c;
|
2007-11-07 02:48:15 +00:00
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splay_node_t *node, *next;
|
2007-05-17 21:34:58 +00:00
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char *fname;
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struct stat s;
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static time_t last_config_check = 0;
|
2007-05-17 22:41:34 +00:00
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|
2007-05-17 21:34:58 +00:00
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/* Reread our own configuration file */
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exit_configuration(&config_tree);
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init_configuration(&config_tree);
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if(!read_server_config()) {
|
2009-09-29 12:55:29 +00:00
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|
logger(LOG_ERR, "Unable to reread configuration file, exitting.");
|
2007-05-17 21:34:58 +00:00
|
|
|
event_loopexit(NULL);
|
2007-11-07 02:51:24 +00:00
|
|
|
return EINVAL;
|
2007-05-17 21:34:58 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Close connections to hosts that have a changed or deleted host config file */
|
|
|
|
|
2007-11-07 02:48:15 +00:00
|
|
|
for(node = connection_tree->head; node; node = next) {
|
2007-05-17 21:34:58 +00:00
|
|
|
c = node->data;
|
2007-11-07 02:48:15 +00:00
|
|
|
next = node->next;
|
2007-05-17 21:34:58 +00:00
|
|
|
|
|
|
|
if(c->outgoing) {
|
|
|
|
free(c->outgoing->name);
|
|
|
|
if(c->outgoing->ai)
|
|
|
|
freeaddrinfo(c->outgoing->ai);
|
|
|
|
free(c->outgoing);
|
|
|
|
c->outgoing = NULL;
|
|
|
|
}
|
|
|
|
|
2009-09-16 18:28:30 +00:00
|
|
|
xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
|
2007-05-17 21:34:58 +00:00
|
|
|
if(stat(fname, &s) || s.st_mtime > last_config_check)
|
|
|
|
terminate_connection(c, c->status.active);
|
|
|
|
free(fname);
|
|
|
|
}
|
|
|
|
|
|
|
|
last_config_check = time(NULL);
|
|
|
|
|
2010-04-17 10:21:53 +00:00
|
|
|
/* If StrictSubnet is set, expire deleted Subnets and read new ones in */
|
2009-04-02 23:05:23 +00:00
|
|
|
|
2010-04-17 10:21:53 +00:00
|
|
|
if(strictsubnets) {
|
|
|
|
subnet_t *subnet;
|
2002-09-09 21:25:28 +00:00
|
|
|
|
2010-06-04 12:53:52 +00:00
|
|
|
|
2010-04-17 10:21:53 +00:00
|
|
|
for(node = subnet_tree->head; node; node = node->next) {
|
|
|
|
subnet = node->data;
|
|
|
|
subnet->expires = 1;
|
2002-09-09 21:25:28 +00:00
|
|
|
}
|
|
|
|
|
2010-04-17 10:21:53 +00:00
|
|
|
load_all_subnets();
|
|
|
|
|
|
|
|
for(node = subnet_tree->head; node; node = next) {
|
|
|
|
next = node->next;
|
|
|
|
subnet = node->data;
|
|
|
|
if(subnet->expires == 1) {
|
2012-02-22 13:23:59 +00:00
|
|
|
send_del_subnet(everyone, subnet);
|
2010-04-17 10:21:53 +00:00
|
|
|
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 {
|
2012-02-22 13:23:59 +00:00
|
|
|
send_add_subnet(everyone, subnet);
|
2010-04-17 10:21:53 +00:00
|
|
|
if(subnet->owner->status.reachable)
|
|
|
|
subnet_update(subnet->owner, subnet, true);
|
2010-01-15 22:19:08 +00:00
|
|
|
}
|
2002-09-09 21:25:28 +00:00
|
|
|
}
|
2010-04-17 10:21:53 +00:00
|
|
|
}
|
2002-09-09 21:25:28 +00:00
|
|
|
|
2007-05-17 21:34:58 +00:00
|
|
|
/* Try to make outgoing connections */
|
|
|
|
|
|
|
|
try_outgoing_connections();
|
2007-11-07 02:51:24 +00:00
|
|
|
|
|
|
|
return 0;
|
2007-05-17 21:34:58 +00:00
|
|
|
}
|
|
|
|
|
2007-11-07 02:50:58 +00:00
|
|
|
void retry(void) {
|
2007-05-17 23:04:02 +00:00
|
|
|
connection_t *c;
|
2007-05-18 10:05:26 +00:00
|
|
|
splay_node_t *node;
|
2007-05-17 23:04:02 +00:00
|
|
|
|
|
|
|
for(node = connection_tree->head; node; node = node->next) {
|
|
|
|
c = node->data;
|
|
|
|
|
|
|
|
if(c->outgoing && !c->node) {
|
|
|
|
if(timeout_initialized(&c->outgoing->ev))
|
|
|
|
event_del(&c->outgoing->ev);
|
|
|
|
if(c->status.connecting)
|
|
|
|
close(c->socket);
|
|
|
|
c->outgoing->timeout = 0;
|
|
|
|
do_outgoing_connection(c);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
/*
|
2000-04-30 01:15:47 +00:00
|
|
|
this is where it all happens...
|
2000-03-26 00:33:07 +00:00
|
|
|
*/
|
2007-05-18 10:00:00 +00:00
|
|
|
int main_loop(void) {
|
2007-05-18 09:43:52 +00:00
|
|
|
struct event timeout_event;
|
2002-09-09 21:25:28 +00:00
|
|
|
|
2007-05-18 09:43:52 +00:00
|
|
|
timeout_set(&timeout_event, timeout_handler, &timeout_event);
|
|
|
|
event_add(&timeout_event, &(struct timeval){pingtimeout, 0});
|
2009-11-05 22:29:28 +00:00
|
|
|
|
2011-06-25 18:20:07 +00:00
|
|
|
#ifndef HAVE_MINGW
|
|
|
|
struct event sighup_event;
|
|
|
|
struct event sigterm_event;
|
|
|
|
struct event sigquit_event;
|
|
|
|
struct event sigalrm_event;
|
|
|
|
|
2007-05-17 21:34:58 +00:00
|
|
|
signal_set(&sighup_event, SIGHUP, sighup_handler, NULL);
|
|
|
|
signal_add(&sighup_event, NULL);
|
2007-05-17 22:41:34 +00:00
|
|
|
signal_set(&sigterm_event, SIGTERM, sigterm_handler, NULL);
|
|
|
|
signal_add(&sigterm_event, NULL);
|
|
|
|
signal_set(&sigquit_event, SIGQUIT, sigterm_handler, NULL);
|
|
|
|
signal_add(&sigquit_event, NULL);
|
2011-06-25 18:20:07 +00:00
|
|
|
signal_set(&sigalrm_event, SIGALRM, sigalrm_handler, NULL);
|
|
|
|
signal_add(&sigalrm_event, NULL);
|
2009-11-05 22:29:28 +00:00
|
|
|
#endif
|
2007-05-17 21:34:58 +00:00
|
|
|
|
2007-05-18 09:43:52 +00:00
|
|
|
if(event_loop(0) < 0) {
|
2009-09-29 12:55:29 +00:00
|
|
|
logger(LOG_ERR, "Error while waiting for input: %s", strerror(errno));
|
2007-05-18 09:43:52 +00:00
|
|
|
return 1;
|
2002-09-09 21:25:28 +00:00
|
|
|
}
|
2003-08-02 20:50:38 +00:00
|
|
|
|
2011-06-25 18:20:07 +00:00
|
|
|
#ifndef HAVE_MINGW
|
2007-05-17 21:34:58 +00:00
|
|
|
signal_del(&sighup_event);
|
2007-05-17 22:41:34 +00:00
|
|
|
signal_del(&sigterm_event);
|
|
|
|
signal_del(&sigquit_event);
|
2011-06-25 18:20:07 +00:00
|
|
|
signal_del(&sigalrm_event);
|
|
|
|
#endif
|
2011-05-22 11:15:27 +00:00
|
|
|
|
2011-06-25 18:20:07 +00:00
|
|
|
event_del(&timeout_event);
|
2007-05-17 21:34:58 +00:00
|
|
|
|
2003-08-02 20:50:38 +00:00
|
|
|
return 0;
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|