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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 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 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
6	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
7	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
8	(at your option) any later version.	10	(at your option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13	GNU General Public License for more details.	15	GNU General Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
16	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18	*/	20	*/
19		21
20	#include "config.h"	22	#include "config.h"
21		23
22	#include <list>	24	#include <list>
23		25
		26	#include <cstdio>
		27	#include <cstring>
24	#include <cstdlib>	28	#include <cstdlib>
25	#include <cstring>
26	#include <cstdio>
27		29
28	#include <sys/types.h>	30	#include <sys/types.h>
29	#include <sys/socket.h>	31	#include <sys/socket.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <errno.h>	33	#include <errno.h>
54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57		59
58	char *env;	60	char *env;
59	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60	putenv (env);
61	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
62	putenv (env);
63	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
64	putenv (env);
65	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
66	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
68	putenv (env);
69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
71	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
72	putenv (env);	71	putenv (env);
73		72
…		…
101	sockinfo si (THISNODE, PROT_IPv4);	100	sockinfo si (THISNODE, PROT_IPv4);
102		101
103	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
104	{	103	{
105	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
106	exit (1);	105	exit (EXIT_FAILURE);
107	}	106	}
108		107
109	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
110	}	109	}
111		110
112	udpv4_fd = -1;	111	udpv4_fd = -1;
113		112
114	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
…		…
139	sockinfo si (THISNODE, PROT_UDPv4);	138	sockinfo si (THISNODE, PROT_UDPv4);
140		139
141	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
142	{	141	{
143	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
144	exit (1);	143	exit (EXIT_FAILURE);
145	}	144	}
146		145
147	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
148	}	147	}
149		148
150	icmpv4_fd = -1;	149	icmpv4_fd = -1;
151		150
152	#if ENABLE_ICMP	151	#if ENABLE_ICMP
…		…
183	sockinfo si (THISNODE, PROT_ICMPv4);	182	sockinfo si (THISNODE, PROT_ICMPv4);
184		183
185	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
186	{	185	{
187	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
188	exit (1);	187	exit (EXIT_FAILURE);
189	}	188	}
190		189
191	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
192	}	191	}
193	#endif	192	#endif
194		193
195	tcpv4_fd = -1;	194	tcpv4_fd = -1;
196		195
…		…
213	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
214		213
215	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
216	{	215	{
217	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
218	exit (1);	217	exit (EXIT_FAILURE);
219	}	218	}
220		219
221	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
222	{	221	{
223	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
224	exit (1);	223	exit (EXIT_FAILURE);
		224	}
		225
		226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		227	}
		228	#endif
		229
		230	#if ENABLE_DNS
		231	if (THISNODE->protocols & PROT_DNSv4)
		232	{
		233	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		234
		235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		236
		237	if (dnsv4_fd < 0)
		238	return -1;
		239
		240	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		241	// this I really consider a linux bug. I am neither connected
		242	// nor do I fragment myself. Linux still sets DF and doesn't
		243	// fragment for me sometimes.
		244	{
		245	int oval = IP_PMTUDISC_DONT;
		246	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		247	}
		248	#endif
		249
		250	// standard daemon practise...
		251	{
		252	int oval = 1;
		253	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		254	}
		255
		256	sockinfo si (THISNODE->dns_hostname,
		257	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		258	PROT_DNSv4);
		259
		260	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
225	}	261	{
		262	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		263	exit (EXIT_FAILURE);
		264	}
226		265
227	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	266	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
228	}	267	}
229	#endif	268	#endif
230		269
231	tap = new tap_device ();	270	tap = new tap_device ();
232	if (!tap) //D this, of course, never catches	271	if (!tap) //D this, of course, never catches
233	{	272	{
234	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	273	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
235	exit (1);	274	exit (EXIT_FAILURE);
236	}	275	}
237		276
238	run_script (run_script_cb (this, &vpn::script_if_up), true);	277	run_script (run_script_cb (this, &vpn::script_if_up), true);
239		278
240	tap_ev_watcher.start (tap->fd, POLLIN);	279	tap_ev_watcher.start (tap->fd, EVENT_READ);
241		280
242	reconnect_all ();	281	reconnect_all ();
243		282
244	return 0;	283	return 0;
245	}
246
247	// send a vpn packet out to other hosts
248	bool
249	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
250	{
251	switch (si.prot)
252	{
253	case PROT_IPv4:
254	return send_ipv4_packet (pkt, si, tos);
255
256	case PROT_UDPv4:
257	return send_udpv4_packet (pkt, si, tos);
258
259	#if ENABLE_TCP
260	case PROT_TCPv4:
261	return send_tcpv4_packet (pkt, si, tos);
262	#endif
263
264	#if ENABLE_ICMP
265	case PROT_ICMPv4:
266	return send_icmpv4_packet (pkt, si, tos);
267	#endif
268
269	default:
270	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
271	return false;
272	}
273	}	284	}
274		285
275	bool	286	bool
276	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	287	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
277	{	288	{
…		…
396	else	407	else
397	c->recv_vpn_packet (pkt, rsi);	408	c->recv_vpn_packet (pkt, rsi);
398	}	409	}
399	}	410	}
400		411
		412	bool
		413	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		414	{
		415	switch (si.prot)
		416	{
		417	case PROT_IPv4:
		418	return send_ipv4_packet (pkt, si, tos);
		419	case PROT_UDPv4:
		420	return send_udpv4_packet (pkt, si, tos);
		421	#if ENABLE_TCP
		422	case PROT_TCPv4:
		423	return send_tcpv4_packet (pkt, si, tos);
		424	#endif
		425	#if ENABLE_ICMP
		426	case PROT_ICMPv4:
		427	return send_icmpv4_packet (pkt, si, tos);
		428	#endif
		429	#if ENABLE_DNS
		430	case PROT_DNSv4:
		431	return send_dnsv4_packet (pkt, si, tos);
		432	#endif
		433
		434	default:
		435	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		436	}
		437
		438	return false;
		439	}
		440
401	void	441	void
402	vpn::ipv4_ev (io_watcher &w, short revents)	442	vpn::ipv4_ev (io_watcher &w, short revents)
403	{	443	{
404	if (revents & (POLLIN \| POLLERR))	444	if (revents & EVENT_READ)
405	{	445	{
406	vpn_packet *pkt = new vpn_packet;	446	vpn_packet *pkt = new vpn_packet;
407	struct sockaddr_in sa;	447	struct sockaddr_in sa;
408	socklen_t sa_len = sizeof (sa);	448	socklen_t sa_len = sizeof (sa);
409	int len;	449	int len;
…		…
414		454
415	if (len > 0)	455	if (len > 0)
416	{	456	{
417	pkt->len = len;	457	pkt->len = len;
418		458
419	// raw sockets deliver the ipv4, but don't expect it on sends	459	// raw sockets deliver the ipv4 header, but don't expect it on sends
420	// this is slow, but...
421	pkt->skip_hdr (IP_OVERHEAD);	460	pkt->skip_hdr (IP_OVERHEAD);
422		461
423	recv_vpn_packet (pkt, si);	462	recv_vpn_packet (pkt, si);
424	}	463	}
425	else	464	else
…		…
428	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	467	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
429	}	468	}
430		469
431	delete pkt;	470	delete pkt;
432	}	471	}
433	else if (revents & POLLHUP)
434	{
435	// this cannot ;) happen on udp sockets
436	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
437	exit (1);
438	}
439	else	472	else
440	{	473	{
441	slog (L_ERR,	474	slog (L_ERR,
442	_("FATAL: unknown revents %08x in socket, terminating\n"),	475	_("FATAL: unknown revents %08x in socket, terminating\n"),
443	revents);	476	revents);
444	exit (1);	477	exit (EXIT_FAILURE);
445	}	478	}
446	}	479	}
447		480
448	#if ENABLE_ICMP	481	#if ENABLE_ICMP
449	void	482	void
450	vpn::icmpv4_ev (io_watcher &w, short revents)	483	vpn::icmpv4_ev (io_watcher &w, short revents)
451	{	484	{
452	if (revents & (POLLIN \| POLLERR))	485	if (revents & EVENT_READ)
453	{	486	{
454	vpn_packet *pkt = new vpn_packet;	487	vpn_packet *pkt = new vpn_packet;
455	struct sockaddr_in sa;	488	struct sockaddr_in sa;
456	socklen_t sa_len = sizeof (sa);	489	socklen_t sa_len = sizeof (sa);
457	int len;	490	int len;
…		…
482	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	515	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
483	}	516	}
484		517
485	delete pkt;	518	delete pkt;
486	}	519	}
487	else if (revents & POLLHUP)
488	{
489	// this cannot ;) happen on udp sockets
490	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
491	exit (1);
492	}
493	else	520	else
494	{	521	{
495	slog (L_ERR,	522	slog (L_ERR,
496	_("FATAL: unknown revents %08x in socket, terminating\n"),	523	_("FATAL: unknown revents %08x in socket, terminating\n"),
497	revents);	524	revents);
498	exit (1);	525	exit (EXIT_FAILURE);
499	}	526	}
500	}	527	}
501	#endif	528	#endif
502		529
503	void	530	void
504	vpn::udpv4_ev (io_watcher &w, short revents)	531	vpn::udpv4_ev (io_watcher &w, short revents)
505	{	532	{
506	if (revents & (POLLIN \| POLLERR))	533	if (revents & EVENT_READ)
507	{	534	{
508	vpn_packet *pkt = new vpn_packet;	535	vpn_packet *pkt = new vpn_packet;
509	struct sockaddr_in sa;	536	struct sockaddr_in sa;
510	socklen_t sa_len = sizeof (sa);	537	socklen_t sa_len = sizeof (sa);
511	int len;	538	int len;
…		…
526	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	553	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
527	}	554	}
528		555
529	delete pkt;	556	delete pkt;
530	}	557	}
531	else if (revents & POLLHUP)
532	{
533	// this cannot ;) happen on udp sockets
534	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
535	exit (1);
536	}
537	else	558	else
538	{	559	{
539	slog (L_ERR,	560	slog (L_ERR,
540	_("FATAL: unknown revents %08x in socket, terminating\n"),	561	_("FATAL: unknown revents %08x in socket, terminating\n"),
541	revents);	562	revents);
542	exit (1);	563	exit (EXIT_FAILURE);
543	}	564	}
544	}	565	}
545		566
546	void	567	void
547	vpn::tap_ev (io_watcher &w, short revents)	568	vpn::tap_ev (io_watcher &w, short revents)
548	{	569	{
549	if (revents & POLLIN)	570	if (revents & EVENT_READ)
550	{	571	{
551	/* process data */	572	/* process data */
552	tap_packet *pkt;	573	tap_packet *pkt;
553		574
554	pkt = tap->recv ();	575	pkt = tap->recv ();
…		…
561	int dst = mac2id (pkt->dst);	582	int dst = mac2id (pkt->dst);
562	int src = mac2id (pkt->src);	583	int src = mac2id (pkt->src);
563		584
564	if (src != THISNODE->id)	585	if (src != THISNODE->id)
565	{	586	{
566	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	587	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
567	exit (1);	588	exit (EXIT_FAILURE);
568	}	589	}
569		590
570	if (dst == THISNODE->id)	591	if (dst == THISNODE->id)
571	{	592	{
572	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	593	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
573	exit (1);	594	exit (EXIT_FAILURE);
574	}	595	}
575		596
576	if (dst > conns.size ())	597	if (dst > conns.size ())
577	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	598	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
578	else	599	else
579	inject_data_packet (pkt, dst);	600	inject_data_packet (pkt, dst);
580	}	601	}
581		602
582	delete pkt;	603	delete pkt;
583	}	604	}
584	else if (revents & (POLLHUP \| POLLERR))
585	{
586	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
587	exit (1);
588	}
589	else	605	else
590	abort ();	606	abort ();
591	}	607	}
592		608
593	void	609	void
…		…
598	if (events & EVENT_SHUTDOWN)	614	if (events & EVENT_SHUTDOWN)
599	{	615	{
600	slog (L_INFO, _("preparing shutdown..."));	616	slog (L_INFO, _("preparing shutdown..."));
601		617
602	shutdown_all ();	618	shutdown_all ();
603
604	remove_pid (pidfilename);	619	remove_pid (conf.pidfilename);
605
606	slog (L_INFO, _("terminating"));	620	slog (L_INFO, _("terminating"));
607		621	exit (EXIT_SUCCESS);
608	exit (0);
609	}	622	}
610		623
611	if (events & EVENT_RECONNECT)	624	if (events & EVENT_RECONNECT)
612	{	625	{
613	slog (L_INFO, _("forced reconnect"));	626	slog (L_INFO, _("forced reconnect"));
…		…
615	reconnect_all ();	628	reconnect_all ();
616	}	629	}
617		630
618	events = 0;	631	events = 0;
619	}	632	}
620
621	w.at = TSTAMP_CANCEL;
622	}	633	}
623		634
624	void	635	void
625	vpn::shutdown_all ()	636	vpn::shutdown_all ()
626	{	637	{
…		…
639	connection_init ();	650	connection_init ();
640		651
641	for (configuration::node_vector::iterator i = conf.nodes.begin ();	652	for (configuration::node_vector::iterator i = conf.nodes.begin ();
642	i != conf.nodes.end (); ++i)	653	i != conf.nodes.end (); ++i)
643	{	654	{
644	connection *conn = new connection (this);	655	connection conn = new connection (this, i);
645
646	conn->conf = *i;
647	conns.push_back (conn);	656	conns.push_back (conn);
648
649	conn->establish_connection ();	657	conn->establish_connection ();
650	}	658	}
651	}	659	}
652		660
653	connection *vpn::find_router ()	661	connection *vpn::find_router ()
…		…
716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	724	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
717	#endif	725	#endif
718	#if ENABLE_ICMP	726	#if ENABLE_ICMP
719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	727	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
720	#endif	728	#endif
		729	#if ENABLE_DNS
		730	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		731	#endif
721	, tap_ev_watcher (this, &vpn::tap_ev)	732	, tap_ev_watcher (this, &vpn::tap_ev)
722	{	733	{
723	}	734	}
724		735
725	vpn::~vpn ()	736	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs. Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC