[ViewVC] Diff of: cvs/gvpe/src/vpn.C

Comparing gvpe/src/vpn.C (file contents):
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
3		4
4	This program is free software; you can redistribute it and/or modify	5	This program is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	6	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	7	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	8	(at your option) any later version.
18		19
19	#include "config.h"	20	#include "config.h"
20		21
21	#include <list>	22	#include <list>
22		23
		24	#include <cstdio>
		25	#include <cstring>
23	#include <cstdlib>	26	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		27
27	#include <sys/types.h>	28	#include <sys/types.h>
28	#include <sys/socket.h>	29	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	30	#include <sys/wait.h>
31	#include <errno.h>	31	#include <errno.h>
32	#include <time.h>	32	#include <time.h>
33	#include <unistd.h>	33	#include <unistd.h>
34	#include <fcntl.h>	34	#include <fcntl.h>
…		…
40		40
41	#include "connection.h"	41	#include "connection.h"
42	#include "util.h"	42	#include "util.h"
43	#include "vpn.h"	43	#include "vpn.h"
44		44
		45	vpn network; // THE vpn (bad design...)
		46
45	/////////////////////////////////////////////////////////////////////////////	47	/////////////////////////////////////////////////////////////////////////////
46		48
47	const char *vpn::script_if_up ()	49	const char *vpn::script_if_up ()
48	{	50	{
49	// the tunnel device mtu should be the physical mtu - overhead	51	// the tunnel device mtu should be the physical mtu - overhead
…		…
52	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55		57
56	char *env;	58	char *env;
57	asprintf (&env, "CONFBASE=%s", confbase);	59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
60	putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id);	61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62	putenv (env);
63	asprintf (&env, "IFNAME=%s", tap->interface ());	62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64	putenv (env);	63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu);	65	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	putenv (env);
67	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
68	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69	THISNODE->id & 0xff);	68	THISNODE->id & 0xff);
70	putenv (env);	69	putenv (env);
71		70
…		…
99	sockinfo si (THISNODE, PROT_IPv4);	98	sockinfo si (THISNODE, PROT_IPv4);
100		99
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	101	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
104	exit (1);	103	exit (EXIT_FAILURE);
105	}	104	}
106		105
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
108	}	107	}
109		108
110	udpv4_fd = -1;	109	udpv4_fd = -1;
111		110
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
…		…
137	sockinfo si (THISNODE, PROT_UDPv4);	136	sockinfo si (THISNODE, PROT_UDPv4);
138		137
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	139	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
142	exit (1);	141	exit (EXIT_FAILURE);
143	}	142	}
144		143
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
146	}	145	}
147		146
148	icmpv4_fd = -1;	147	icmpv4_fd = -1;
149		148
150	#if ENABLE_ICMP	149	#if ENABLE_ICMP
…		…
181	sockinfo si (THISNODE, PROT_ICMPv4);	180	sockinfo si (THISNODE, PROT_ICMPv4);
182		181
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	183	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
186	exit (1);	185	exit (EXIT_FAILURE);
187	}	186	}
188		187
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
190	}	189	}
191	#endif	190	#endif
192		191
193	tcpv4_fd = -1;	192	tcpv4_fd = -1;
194		193
…		…
211	sockinfo si (THISNODE, PROT_TCPv4);	210	sockinfo si (THISNODE, PROT_TCPv4);
212		211
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	213	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
216	exit (1);	215	exit (EXIT_FAILURE);
217	}	216	}
218		217
219	if (listen (tcpv4_fd, 5))	218	if (listen (tcpv4_fd, 5))
220	{	219	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
222	exit (1);	221	exit (EXIT_FAILURE);
		222	}
		223
		224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		225	}
		226	#endif
		227
		228	#if ENABLE_DNS
		229	if (THISNODE->protocols & PROT_DNSv4)
		230	{
		231	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		232
		233	if (dnsv4_fd < 0)
		234	return -1;
		235
		236	// standard daemon practise...
		237	{
		238	int oval = 1;
		239	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		240	}
		241
		242	sockinfo si (THISNODE, PROT_DNSv4);
		243
		244	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
223	}	245	{
		246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		247	exit (EXIT_FAILURE);
		248	}
224		249
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
226	}	251	}
227	#endif	252	#endif
228		253
229	tap = new tap_device ();	254	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	255	if (!tap) //D this, of course, never catches
231	{	256	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233	exit (1);	258	exit (EXIT_FAILURE);
234	}	259	}
235		260
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	261	run_script (run_script_cb (this, &vpn::script_if_up), true);
237		262
238	tap_ev_watcher.start (tap->fd, POLLIN);	263	tap_ev_watcher.start (tap->fd, EVENT_READ);
239		264
240	reconnect_all ();	265	reconnect_all ();
241		266
242	return 0;	267	return 0;
243	}	268	}
…		…
260	#endif	285	#endif
261		286
262	#if ENABLE_ICMP	287	#if ENABLE_ICMP
263	case PROT_ICMPv4:	288	case PROT_ICMPv4:
264	return send_icmpv4_packet (pkt, si, tos);	289	return send_icmpv4_packet (pkt, si, tos);
		290	#endif
		291
		292	#if ENABLE_DNS
		293	case PROT_DNSv4:
		294	return send_dnsv4_packet (pkt, si, tos);
265	#endif	295	#endif
266		296
267	default:	297	default:
268	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);	298	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
269	return false;	299	return false;
…		…
333	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	363	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334	#endif	364	#endif
335	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	365	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
336		366
337	return true;	367	return true;
		368	}
		369
		370	void
		371	vpn::inject_data_packet (tap_packet *pkt, int dst)
		372	{
		373	if (dst)
		374	{
		375	// unicast
		376	if (dst != THISNODE->id)
		377	conns[dst - 1]->inject_data_packet (pkt);
		378	}
		379	else
		380	{
		381	// broadcast, this is ugly, but due to the security policy
		382	// we have to connect to all hosts...
		383	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		384	if ((*c)->conf != THISNODE)
		385	(*c)->inject_data_packet (pkt, true);
		386	}
338	}	387	}
339		388
340	void	389	void
341	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	390	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
342	{	391	{
…		…
359	connection *c = conns[src - 1];	408	connection *c = conns[src - 1];
360		409
361	if (dst == 0)	410	if (dst == 0)
362	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	411	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
363	c->conf->nodename, (const char *)rsi);	412	c->conf->nodename, (const char *)rsi);
364	else if (dst != 0 && dst != THISNODE->id)	413	else if (dst != THISNODE->id)
365	{	414	{
366	if (THISNODE->routerprio)	415	if (THISNODE->routerprio)
367	// the tos setting gets lost here. who cares.	416	// the tos setting gets lost here. who cares.
368	conns[dst - 1]->inject_vpn_packet (pkt);	417	conns[dst - 1]->inject_vpn_packet (pkt);
369	else	418	else
…		…
378	}	427	}
379		428
380	void	429	void
381	vpn::ipv4_ev (io_watcher &w, short revents)	430	vpn::ipv4_ev (io_watcher &w, short revents)
382	{	431	{
383	if (revents & (POLLIN \| POLLERR))	432	if (revents & EVENT_READ)
384	{	433	{
385	vpn_packet *pkt = new vpn_packet;	434	vpn_packet *pkt = new vpn_packet;
386	struct sockaddr_in sa;	435	struct sockaddr_in sa;
387	socklen_t sa_len = sizeof (sa);	436	socklen_t sa_len = sizeof (sa);
388	int len;	437	int len;
…		…
407	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	456	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
408	}	457	}
409		458
410	delete pkt;	459	delete pkt;
411	}	460	}
412	else if (revents & POLLHUP)
413	{
414	// this cannot ;) happen on udp sockets
415	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
416	exit (1);
417	}
418	else	461	else
419	{	462	{
420	slog (L_ERR,	463	slog (L_ERR,
421	_("FATAL: unknown revents %08x in socket, terminating\n"),	464	_("FATAL: unknown revents %08x in socket, terminating\n"),
422	revents);	465	revents);
423	exit (1);	466	exit (EXIT_FAILURE);
424	}	467	}
425	}	468	}
426		469
427	#if ENABLE_ICMP	470	#if ENABLE_ICMP
428	void	471	void
429	vpn::icmpv4_ev (io_watcher &w, short revents)	472	vpn::icmpv4_ev (io_watcher &w, short revents)
430	{	473	{
431	if (revents & (POLLIN \| POLLERR))	474	if (revents & EVENT_READ)
432	{	475	{
433	vpn_packet *pkt = new vpn_packet;	476	vpn_packet *pkt = new vpn_packet;
434	struct sockaddr_in sa;	477	struct sockaddr_in sa;
435	socklen_t sa_len = sizeof (sa);	478	socklen_t sa_len = sizeof (sa);
436	int len;	479	int len;
…		…
461	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	504	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
462	}	505	}
463		506
464	delete pkt;	507	delete pkt;
465	}	508	}
466	else if (revents & POLLHUP)
467	{
468	// this cannot ;) happen on udp sockets
469	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
470	exit (1);
471	}
472	else	509	else
473	{	510	{
474	slog (L_ERR,	511	slog (L_ERR,
475	_("FATAL: unknown revents %08x in socket, terminating\n"),	512	_("FATAL: unknown revents %08x in socket, terminating\n"),
476	revents);	513	revents);
477	exit (1);	514	exit (EXIT_FAILURE);
478	}	515	}
479	}	516	}
480	#endif	517	#endif
481		518
482	void	519	void
483	vpn::udpv4_ev (io_watcher &w, short revents)	520	vpn::udpv4_ev (io_watcher &w, short revents)
484	{	521	{
485	if (revents & (POLLIN \| POLLERR))	522	if (revents & EVENT_READ)
486	{	523	{
487	vpn_packet *pkt = new vpn_packet;	524	vpn_packet *pkt = new vpn_packet;
488	struct sockaddr_in sa;	525	struct sockaddr_in sa;
489	socklen_t sa_len = sizeof (sa);	526	socklen_t sa_len = sizeof (sa);
490	int len;	527	int len;
…		…
505	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	542	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
506	}	543	}
507		544
508	delete pkt;	545	delete pkt;
509	}	546	}
510	else if (revents & POLLHUP)
511	{
512	// this cannot ;) happen on udp sockets
513	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
514	exit (1);
515	}
516	else	547	else
517	{	548	{
518	slog (L_ERR,	549	slog (L_ERR,
519	_("FATAL: unknown revents %08x in socket, terminating\n"),	550	_("FATAL: unknown revents %08x in socket, terminating\n"),
520	revents);	551	revents);
521	exit (1);	552	exit (EXIT_FAILURE);
522	}	553	}
523	}	554	}
524		555
525	void	556	void
526	vpn::tap_ev (io_watcher &w, short revents)	557	vpn::tap_ev (io_watcher &w, short revents)
527	{	558	{
528	if (revents & POLLIN)	559	if (revents & EVENT_READ)
529	{	560	{
530	/* process data */	561	/* process data */
531	tap_packet *pkt;	562	tap_packet *pkt;
532		563
533	pkt = tap->recv ();	564	pkt = tap->recv ();
534		565
		566	if (!pkt)
		567	return;
		568
		569	if (pkt->len > 14)
		570	{
535	int dst = mac2id (pkt->dst);	571	int dst = mac2id (pkt->dst);
536	int src = mac2id (pkt->src);	572	int src = mac2id (pkt->src);
537		573
538	if (src != THISNODE->id)	574	if (src != THISNODE->id)
539	{
540	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
541	exit (1);
542	}
543
544	if (dst == THISNODE->id)
545	{
546	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
547	exit (1);
548	}
549
550	if (dst > conns.size ())
551	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
552	else
553	{
554	if (dst)
555	{	575	{
556	// unicast	576	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
557	if (dst != THISNODE->id)	577	exit (EXIT_FAILURE);
558	conns[dst - 1]->inject_data_packet (pkt);
559	}	578	}
		579
		580	if (dst == THISNODE->id)
		581	{
		582	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		583	exit (EXIT_FAILURE);
		584	}
		585
		586	if (dst > conns.size ())
		587	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
560	else	588	else
561	{
562	// broadcast, this is ugly, but due to the security policy
563	// we have to connect to all hosts...
564	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
565	if ((*c)->conf != THISNODE)
566	(*c)->inject_data_packet (pkt);	589	inject_data_packet (pkt, dst);
567	}
568	}	590	}
569		591
570	delete pkt;	592	delete pkt;
571	}
572	else if (revents & (POLLHUP \| POLLERR))
573	{
574	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
575	exit (1);
576	}	593	}
577	else	594	else
578	abort ();	595	abort ();
579	}	596	}
580		597
…		…
586	if (events & EVENT_SHUTDOWN)	603	if (events & EVENT_SHUTDOWN)
587	{	604	{
588	slog (L_INFO, _("preparing shutdown..."));	605	slog (L_INFO, _("preparing shutdown..."));
589		606
590	shutdown_all ();	607	shutdown_all ();
591
592	remove_pid (pidfilename);	608	remove_pid (conf.pidfilename);
593
594	slog (L_INFO, _("terminating"));	609	slog (L_INFO, _("terminating"));
595		610	exit (EXIT_SUCCESS);
596	exit (0);
597	}	611	}
598		612
599	if (events & EVENT_RECONNECT)	613	if (events & EVENT_RECONNECT)
600	{	614	{
601	slog (L_INFO, _("forced reconnect"));	615	slog (L_INFO, _("forced reconnect"));
…		…
603	reconnect_all ();	617	reconnect_all ();
604	}	618	}
605		619
606	events = 0;	620	events = 0;
607	}	621	}
608
609	w.at = TSTAMP_CANCEL;
610	}	622	}
611		623
612	void	624	void
613	vpn::shutdown_all ()	625	vpn::shutdown_all ()
614	{	626	{
…		…
704	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
705	#endif	717	#endif
706	#if ENABLE_ICMP	718	#if ENABLE_ICMP
707	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
708	#endif	720	#endif
		721	#if ENABLE_DNS
		722	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		723	#endif
709	, tap_ev_watcher (this, &vpn::tap_ev)	724	, tap_ev_watcher (this, &vpn::tap_ev)
710	{	725	{
711	}	726	}
712		727
713	vpn::~vpn ()	728	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs. Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC