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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2002-06-21 10:11:37 +00:00
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Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>,
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2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2000-05-29 22:20:04 +00:00
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2002-09-04 16:26:45 +00:00
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$Id: net.c,v 1.35.4.177 2002/09/04 16:26:44 guus Exp $
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2000-03-26 00:33:07 +00:00
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*/
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#include "config.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <netinet/in.h>
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2002-06-08 14:08:57 +00:00
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#ifdef HAVE_NETINET_IN_SYSTM_H
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#include <netinet/in_systm.h>
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#endif
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2002-06-08 12:57:10 +00:00
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#ifdef HAVE_NETINET_IP_H
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2001-05-28 08:21:43 +00:00
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#include <netinet/ip.h>
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2002-06-08 12:57:10 +00:00
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#endif
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#ifdef HAVE_NETINET_TCP_H
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2001-05-28 08:21:43 +00:00
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#include <netinet/tcp.h>
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#endif
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2000-03-26 00:33:07 +00:00
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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2001-11-05 19:09:08 +00:00
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#include <signal.h>
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2000-03-26 00:33:07 +00:00
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#include <sys/time.h>
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#include <sys/types.h>
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#include <syslog.h>
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#include <unistd.h>
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2000-10-29 00:02:20 +00:00
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#include <sys/ioctl.h>
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2000-11-15 13:33:27 +00:00
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/* SunOS really wants sys/socket.h BEFORE net/if.h,
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and FreeBSD wants these lines below the rest. */
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <net/if.h>
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2000-11-15 01:06:13 +00:00
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2001-07-04 08:41:36 +00:00
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#include <openssl/rand.h>
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2000-03-26 00:33:07 +00:00
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2002-02-18 16:25:19 +00:00
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#include <utils.h>
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#include <xalloc.h>
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#include <avl_tree.h>
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#include <list.h>
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2000-03-26 00:33:07 +00:00
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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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#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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#include "subnet.h"
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2002-09-04 13:48:52 +00:00
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#include "graph.h"
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2002-02-18 16:25:19 +00:00
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#include "process.h"
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#include "route.h"
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#include "device.h"
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#include "event.h"
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2001-03-04 13:59:32 +00:00
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2002-02-18 16:25:19 +00:00
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#include "system.h"
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2000-03-26 00:33:07 +00:00
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2002-04-18 20:09:05 +00:00
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#ifndef HAVE_RAND_PSEUDO_BYTES
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#define RAND_pseudo_bytes RAND_bytes
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#endif
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2002-02-18 16:25:19 +00:00
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int do_purge = 0;
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int sighup = 0;
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int sigalrm = 0;
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2000-03-26 00:33:07 +00:00
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2002-03-01 14:09:31 +00:00
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time_t now = 0;
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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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void purge(void)
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{
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2002-09-04 16:26:45 +00:00
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avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
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2002-02-10 21:57:54 +00:00
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node_t *n;
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2002-09-04 13:48:52 +00:00
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edge_t *e;
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2002-02-10 21:57:54 +00:00
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subnet_t *s;
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cp
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if(debug_lvl >= DEBUG_PROTOCOL)
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syslog(LOG_DEBUG, _("Purging unreachable nodes"));
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for(nnode = node_tree->head; nnode; nnode = nnext)
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{
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nnext = nnode->next;
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n = (node_t *)nnode->data;
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if(!n->status.reachable)
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{
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if(debug_lvl >= DEBUG_SCARY_THINGS)
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syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name, n->hostname);
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for(snode = n->subnet_tree->head; snode; snode = snext)
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{
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snext = snode->next;
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2002-02-18 16:25:19 +00:00
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s = (subnet_t *)snode->data;
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2002-09-04 16:26:45 +00:00
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send_del_subnet(broadcast, s);
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2002-02-18 16:25:19 +00:00
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subnet_del(n, s);
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2002-02-10 21:57:54 +00:00
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}
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2002-02-18 16:25:19 +00:00
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2002-09-04 13:48:52 +00:00
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for(enode = n->edge_tree->head; enode; enode = enext)
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{
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enext = enode->next;
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e = (edge_t *)enode->data;
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2002-09-04 16:26:45 +00:00
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send_del_edge(broadcast, e);
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2002-09-04 13:48:52 +00:00
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edge_del(e);
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}
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2002-02-10 21:57:54 +00:00
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node_del(n);
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}
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2002-02-18 16:25:19 +00:00
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}
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2002-02-10 21:57:54 +00:00
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cp
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}
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2002-03-27 14:02:36 +00:00
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/*
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put all file descriptors in an fd_set array
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While we're at it, purge stuff that needs to be removed.
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*/
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void build_fdset(fd_set *fs)
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{
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avl_node_t *node, *next;
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connection_t *c;
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int i;
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cp
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FD_ZERO(fs);
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for(node = connection_tree->head; node; node = next)
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{
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next = node->next;
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c = (connection_t *)node->data;
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if(c->status.remove)
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2002-05-01 09:15:58 +00:00
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{
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connection_del(c);
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if(!connection_tree->head)
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purge();
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}
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2002-03-27 14:02:36 +00:00
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else
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FD_SET(c->socket, fs);
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}
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for(i = 0; i < listen_sockets; i++)
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{
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FD_SET(listen_socket[i].tcp, fs);
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FD_SET(listen_socket[i].udp, fs);
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}
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FD_SET(device_fd, fs);
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cp
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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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2002-09-04 13:48:52 +00:00
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- Remove associated edge and tell other connections about it if report = 1
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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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2001-10-27 12:13:17 +00:00
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void terminate_connection(connection_t *c, int report)
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2000-03-26 00:33:07 +00:00
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{
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2001-10-30 16:34:32 +00:00
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cp
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if(c->status.remove)
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return;
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2002-02-18 16:25:19 +00:00
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2001-10-30 16:34:32 +00:00
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if(debug_lvl >= DEBUG_CONNECTIONS)
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syslog(LOG_NOTICE, _("Closing connection with %s (%s)"),
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c->name, c->hostname);
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c->status.remove = 1;
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2002-03-27 14:02:36 +00:00
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c->status.active = 0;
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if(c->node)
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2002-09-04 13:48:52 +00:00
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c->node->connection = NULL;
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if(c->socket)
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close(c->socket);
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if(c->edge)
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2001-10-30 16:34:32 +00:00
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{
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2002-09-04 13:48:52 +00:00
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if(report)
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2002-09-04 16:26:45 +00:00
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send_del_edge(broadcast, c->edge);
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2002-02-10 21:57:54 +00:00
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2002-09-04 13:48:52 +00:00
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edge_del(c->edge);
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/* Run MST and SSSP algorithms */
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graph();
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}
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2002-09-03 20:43:26 +00:00
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2001-10-30 16:34:32 +00:00
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/* Check if this was our outgoing connection */
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2002-02-10 21:57:54 +00:00
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if(c->outgoing)
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2001-10-30 16:34:32 +00:00
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{
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2002-02-10 21:57:54 +00:00
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retry_outgoing(c->outgoing);
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c->outgoing = NULL;
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2001-10-30 16:34:32 +00:00
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}
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cp
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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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2000-11-20 19:12:17 +00:00
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void check_dead_connections(void)
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2000-03-26 00:33:07 +00:00
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{
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2002-09-04 13:48:52 +00:00
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avl_node_t *node, *next;
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2001-10-27 12:13:17 +00:00
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connection_t *c;
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2000-04-25 18:57:23 +00:00
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cp
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2002-09-04 13:48:52 +00:00
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for(node = connection_tree->head; node; node = next)
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2000-03-26 00:33:07 +00:00
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{
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2002-09-04 13:48:52 +00:00
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next = node->next;
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2001-10-27 12:13:17 +00:00
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c = (connection_t *)node->data;
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2002-09-04 13:48:52 +00:00
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if(c->last_ping_time + pingtimeout < now)
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2000-11-20 19:12:17 +00:00
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{
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2001-10-27 12:13:17 +00:00
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if(c->status.active)
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2000-05-14 13:06:52 +00:00
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{
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2001-10-27 12:13:17 +00:00
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if(c->status.pinged)
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2000-05-14 13:06:52 +00:00
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{
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2000-10-21 11:52:08 +00:00
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if(debug_lvl >= DEBUG_PROTOCOL)
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2002-02-18 16:25:19 +00:00
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syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
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c->name, c->hostname);
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c->status.timeout = 1;
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terminate_connection(c, 1);
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2000-05-14 13:06:52 +00:00
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}
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2000-11-04 20:44:28 +00:00
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else
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2000-05-14 13:06:52 +00:00
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{
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2001-10-27 12:13:17 +00:00
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send_ping(c);
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2000-05-14 13:06:52 +00:00
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}
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}
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2001-10-08 13:37:30 +00:00
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else
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{
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if(debug_lvl >= DEBUG_CONNECTIONS)
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syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
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2001-10-27 12:13:17 +00:00
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c->name, c->hostname);
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terminate_connection(c, 0);
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2001-10-08 13:37:30 +00:00
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}
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2000-11-20 19:12:17 +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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2000-04-25 18:57:23 +00:00
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cp
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2000-03-26 00:33:07 +00:00
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}
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/*
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2001-10-27 12:13:17 +00:00
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check all connections to see if anything
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happened on their sockets
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2000-03-26 00:33:07 +00:00
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*/
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2001-10-27 12:13:17 +00:00
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void check_network_activity(fd_set *f)
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2000-03-26 00:33:07 +00:00
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{
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2001-10-27 12:13:17 +00:00
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connection_t *c;
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avl_node_t *node;
|
2002-02-26 23:26:41 +00:00
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int result, i;
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2002-02-18 16:25:19 +00:00
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int len = sizeof(result);
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vpn_packet_t packet;
|
2001-03-04 13:59:32 +00:00
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cp
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2002-02-18 16:25:19 +00:00
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if(FD_ISSET(device_fd, f))
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{
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if(!read_packet(&packet))
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route_outgoing(&packet);
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}
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2001-10-27 12:13:17 +00:00
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for(node = connection_tree->head; node; node = node->next)
|
2000-03-26 00:33:07 +00:00
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{
|
2001-10-27 12:13:17 +00:00
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c = (connection_t *)node->data;
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2000-03-26 00:33:07 +00:00
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2001-10-27 12:13:17 +00:00
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if(c->status.remove)
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2002-03-24 16:28:27 +00:00
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continue;
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2001-10-27 12:13:17 +00:00
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if(FD_ISSET(c->socket, f))
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2002-02-18 16:25:19 +00:00
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{
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if(c->status.connecting)
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{
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c->status.connecting = 0;
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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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{
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if(debug_lvl >= DEBUG_CONNECTIONS)
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syslog(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result));
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close(c->socket);
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do_outgoing_connection(c);
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continue;
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}
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}
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if(receive_meta(c) < 0)
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{
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|
terminate_connection(c, c->status.active);
|
2002-03-27 14:02:36 +00:00
|
|
|
continue;
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
}
|
2000-10-24 15:46:18 +00:00
|
|
|
}
|
2000-03-26 00:33:07 +00:00
|
|
|
|
2002-03-27 14:02:36 +00:00
|
|
|
for(i = 0; i < listen_sockets; i++)
|
2001-10-30 16:34:32 +00:00
|
|
|
{
|
2002-03-27 14:02:36 +00:00
|
|
|
if(FD_ISSET(listen_socket[i].udp, f))
|
|
|
|
handle_incoming_vpn_data(listen_socket[i].udp);
|
|
|
|
if(FD_ISSET(listen_socket[i].tcp, f))
|
|
|
|
handle_new_meta_connection(listen_socket[i].tcp);
|
2001-10-30 16:34:32 +00:00
|
|
|
}
|
|
|
|
cp
|
|
|
|
}
|
|
|
|
|
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
|
|
|
*/
|
|
|
|
void main_loop(void)
|
|
|
|
{
|
|
|
|
fd_set fset;
|
|
|
|
struct timeval tv;
|
|
|
|
int r;
|
2000-05-14 13:02:20 +00:00
|
|
|
time_t last_ping_check;
|
2002-02-10 21:57:54 +00:00
|
|
|
event_t *event;
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2002-03-01 14:09:31 +00:00
|
|
|
last_ping_check = now;
|
2000-03-26 00:33:07 +00:00
|
|
|
|
2002-03-01 14:09:31 +00:00
|
|
|
srand(now);
|
2002-02-10 21:57:54 +00:00
|
|
|
|
2000-03-26 00:33:07 +00:00
|
|
|
for(;;)
|
|
|
|
{
|
2002-03-01 14:09:31 +00:00
|
|
|
now = time(NULL);
|
|
|
|
|
2002-02-10 21:57:54 +00:00
|
|
|
tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
|
2000-03-26 00:33:07 +00:00
|
|
|
tv.tv_usec = 0;
|
|
|
|
|
|
|
|
build_fdset(&fset);
|
|
|
|
|
|
|
|
if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
|
|
|
|
{
|
2002-03-24 16:28:27 +00:00
|
|
|
if(errno != EINTR && errno != EAGAIN)
|
2000-06-29 19:47:04 +00:00
|
|
|
{
|
2002-02-18 16:25:19 +00:00
|
|
|
syslog(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno));
|
2002-03-27 14:02:36 +00:00
|
|
|
cp_trace();
|
2002-03-24 16:28:27 +00:00
|
|
|
dump_connections();
|
2000-06-29 19:47:04 +00:00
|
|
|
return;
|
|
|
|
}
|
2002-04-01 21:28:05 +00:00
|
|
|
|
|
|
|
continue;
|
2000-06-29 19:47:04 +00:00
|
|
|
}
|
|
|
|
|
2002-03-27 14:02:36 +00:00
|
|
|
check_network_activity(&fset);
|
2001-03-04 13:59:32 +00:00
|
|
|
|
2002-03-11 11:45:12 +00:00
|
|
|
if(do_purge)
|
2002-02-10 21:57:54 +00:00
|
|
|
{
|
2002-02-18 16:25:19 +00:00
|
|
|
purge();
|
|
|
|
do_purge = 0;
|
|
|
|
}
|
2002-02-10 21:57:54 +00:00
|
|
|
|
2000-10-29 10:39:08 +00:00
|
|
|
/* Let's check if everybody is still alive */
|
|
|
|
|
2002-03-01 14:09:31 +00:00
|
|
|
if(last_ping_check + pingtimeout < now)
|
2002-02-18 16:25:19 +00:00
|
|
|
{
|
|
|
|
check_dead_connections();
|
2002-03-01 14:09:31 +00:00
|
|
|
last_ping_check = now;
|
|
|
|
|
2002-03-01 14:25:10 +00:00
|
|
|
if(routing_mode== RMODE_SWITCH)
|
2002-03-01 14:09:31 +00:00
|
|
|
age_mac();
|
2000-10-29 10:39:08 +00:00
|
|
|
|
2002-03-22 11:43:48 +00:00
|
|
|
age_past_requests();
|
|
|
|
|
2000-10-29 10:39:08 +00:00
|
|
|
/* Should we regenerate our key? */
|
|
|
|
|
2002-03-01 14:09:31 +00:00
|
|
|
if(keyexpires < now)
|
2000-10-29 10:39:08 +00:00
|
|
|
{
|
|
|
|
if(debug_lvl >= DEBUG_STATUS)
|
|
|
|
syslog(LOG_INFO, _("Regenerating symmetric key"));
|
2001-03-04 13:59:32 +00:00
|
|
|
|
2001-10-27 12:13:17 +00:00
|
|
|
RAND_pseudo_bytes(myself->key, myself->keylength);
|
2002-09-04 16:26:45 +00:00
|
|
|
send_key_changed(broadcast, myself);
|
2002-03-01 14:09:31 +00:00
|
|
|
keyexpires = now + keylifetime;
|
2000-10-29 10:39:08 +00:00
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
while((event = get_expired_event()))
|
|
|
|
{
|
|
|
|
event->handler(event->data);
|
|
|
|
free(event);
|
|
|
|
}
|
2000-03-26 00:33:07 +00:00
|
|
|
|
2002-02-10 21:57:54 +00:00
|
|
|
if(sigalrm)
|
|
|
|
{
|
|
|
|
syslog(LOG_INFO, _("Flushing event queue"));
|
|
|
|
|
2002-02-18 16:25:19 +00:00
|
|
|
while(event_tree->head)
|
|
|
|
{
|
|
|
|
event = (event_t *)event_tree->head->data;
|
|
|
|
event->handler(event->data);
|
|
|
|
event_del(event);
|
|
|
|
}
|
|
|
|
sigalrm = 0;
|
2002-02-10 21:57:54 +00:00
|
|
|
}
|
|
|
|
|
2002-02-18 16:25:19 +00:00
|
|
|
if(sighup)
|
2000-06-30 11:45:16 +00:00
|
|
|
{
|
2002-02-18 16:25:19 +00:00
|
|
|
sighup = 0;
|
|
|
|
close_network_connections();
|
|
|
|
exit_configuration(&config_tree);
|
2000-03-26 00:33:07 +00:00
|
|
|
|
2002-03-11 11:23:04 +00:00
|
|
|
syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds..."));
|
2002-02-20 16:04:07 +00:00
|
|
|
sleep(5);
|
|
|
|
|
|
|
|
init_configuration(&config_tree);
|
|
|
|
|
2002-02-18 16:25:19 +00:00
|
|
|
if(read_server_config())
|
2001-10-27 13:13:35 +00:00
|
|
|
{
|
2002-03-11 11:23:04 +00:00
|
|
|
syslog(LOG_ERR, _("Unable to reread configuration file, exitting."));
|
2002-02-18 16:25:19 +00:00
|
|
|
exit(1);
|
2001-10-27 13:13:35 +00:00
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
|
|
|
if(setup_network_connections())
|
|
|
|
return;
|
|
|
|
|
|
|
|
continue;
|
2000-06-30 11:45:16 +00:00
|
|
|
}
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|