[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 1.31 by pcg, Sat Mar 5 19:13:16 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	// standard daemon practise...
		241	{
		242	int oval = 1;
		243	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		244	}
		245
		246	sockinfo si (THISNODE->dns_hostname,
		247	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		248	PROT_DNSv4);
		249
		250	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
225	}	251	{
		252	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		253	exit (EXIT_FAILURE);
		254	}
226		255
227	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	256	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
228	}	257	}
229	#endif	258	#endif
230		259
231	tap = new tap_device ();	260	tap = new tap_device ();
232	if (!tap) //D this, of course, never catches	261	if (!tap) //D this, of course, never catches
233	{	262	{
234	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	263	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
235	exit (1);	264	exit (EXIT_FAILURE);
236	}	265	}
237		266
238	run_script (run_script_cb (this, &vpn::script_if_up), true);	267	run_script (run_script_cb (this, &vpn::script_if_up), true);
239		268
240	tap_ev_watcher.start (tap->fd, POLLIN);	269	tap_ev_watcher.start (tap->fd, EVENT_READ);
241		270
242	reconnect_all ();	271	reconnect_all ();
243		272
244	return 0;	273	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	}	274	}
274		275
275	bool	276	bool
276	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	277	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
277	{	278	{
…		…
396	else	397	else
397	c->recv_vpn_packet (pkt, rsi);	398	c->recv_vpn_packet (pkt, rsi);
398	}	399	}
399	}	400	}
400		401
		402	bool
		403	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		404	{
		405	switch (si.prot)
		406	{
		407	case PROT_IPv4:
		408	return send_ipv4_packet (pkt, si, tos);
		409	case PROT_UDPv4:
		410	return send_udpv4_packet (pkt, si, tos);
		411	#if ENABLE_TCP
		412	case PROT_TCPv4:
		413	return send_tcpv4_packet (pkt, si, tos);
		414	#endif
		415	#if ENABLE_ICMP
		416	case PROT_ICMPv4:
		417	return send_icmpv4_packet (pkt, si, tos);
		418	#endif
		419	#if ENABLE_DNS
		420	case PROT_DNSv4:
		421	return send_dnsv4_packet (pkt, si, tos);
		422	#endif
		423
		424	default:
		425	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		426	}
		427
		428	return false;
		429	}
		430
401	void	431	void
402	vpn::ipv4_ev (io_watcher &w, short revents)	432	vpn::ipv4_ev (io_watcher &w, short revents)
403	{	433	{
404	if (revents & (POLLIN \| POLLERR))	434	if (revents & EVENT_READ)
405	{	435	{
406	vpn_packet *pkt = new vpn_packet;	436	vpn_packet *pkt = new vpn_packet;
407	struct sockaddr_in sa;	437	struct sockaddr_in sa;
408	socklen_t sa_len = sizeof (sa);	438	socklen_t sa_len = sizeof (sa);
409	int len;	439	int len;
…		…
414		444
415	if (len > 0)	445	if (len > 0)
416	{	446	{
417	pkt->len = len;	447	pkt->len = len;
418		448
419	// raw sockets deliver the ipv4, but don't expect it on sends	449	// raw sockets deliver the ipv4 header, but don't expect it on sends
420	// this is slow, but...
421	pkt->skip_hdr (IP_OVERHEAD);	450	pkt->skip_hdr (IP_OVERHEAD);
422		451
423	recv_vpn_packet (pkt, si);	452	recv_vpn_packet (pkt, si);
424	}	453	}
425	else	454	else
…		…
428	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	457	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
429	}	458	}
430		459
431	delete pkt;	460	delete pkt;
432	}	461	}
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	462	else
440	{	463	{
441	slog (L_ERR,	464	slog (L_ERR,
442	_("FATAL: unknown revents %08x in socket, terminating\n"),	465	_("FATAL: unknown revents %08x in socket, terminating\n"),
443	revents);	466	revents);
444	exit (1);	467	exit (EXIT_FAILURE);
445	}	468	}
446	}	469	}
447		470
448	#if ENABLE_ICMP	471	#if ENABLE_ICMP
449	void	472	void
450	vpn::icmpv4_ev (io_watcher &w, short revents)	473	vpn::icmpv4_ev (io_watcher &w, short revents)
451	{	474	{
452	if (revents & (POLLIN \| POLLERR))	475	if (revents & EVENT_READ)
453	{	476	{
454	vpn_packet *pkt = new vpn_packet;	477	vpn_packet *pkt = new vpn_packet;
455	struct sockaddr_in sa;	478	struct sockaddr_in sa;
456	socklen_t sa_len = sizeof (sa);	479	socklen_t sa_len = sizeof (sa);
457	int len;	480	int len;
…		…
482	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	505	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
483	}	506	}
484		507
485	delete pkt;	508	delete pkt;
486	}	509	}
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	510	else
494	{	511	{
495	slog (L_ERR,	512	slog (L_ERR,
496	_("FATAL: unknown revents %08x in socket, terminating\n"),	513	_("FATAL: unknown revents %08x in socket, terminating\n"),
497	revents);	514	revents);
498	exit (1);	515	exit (EXIT_FAILURE);
499	}	516	}
500	}	517	}
501	#endif	518	#endif
502		519
503	void	520	void
504	vpn::udpv4_ev (io_watcher &w, short revents)	521	vpn::udpv4_ev (io_watcher &w, short revents)
505	{	522	{
506	if (revents & (POLLIN \| POLLERR))	523	if (revents & EVENT_READ)
507	{	524	{
508	vpn_packet *pkt = new vpn_packet;	525	vpn_packet *pkt = new vpn_packet;
509	struct sockaddr_in sa;	526	struct sockaddr_in sa;
510	socklen_t sa_len = sizeof (sa);	527	socklen_t sa_len = sizeof (sa);
511	int len;	528	int len;
…		…
526	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	543	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
527	}	544	}
528		545
529	delete pkt;	546	delete pkt;
530	}	547	}
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	548	else
538	{	549	{
539	slog (L_ERR,	550	slog (L_ERR,
540	_("FATAL: unknown revents %08x in socket, terminating\n"),	551	_("FATAL: unknown revents %08x in socket, terminating\n"),
541	revents);	552	revents);
542	exit (1);	553	exit (EXIT_FAILURE);
543	}	554	}
544	}	555	}
545		556
546	void	557	void
547	vpn::tap_ev (io_watcher &w, short revents)	558	vpn::tap_ev (io_watcher &w, short revents)
548	{	559	{
549	if (revents & POLLIN)	560	if (revents & EVENT_READ)
550	{	561	{
551	/* process data */	562	/* process data */
552	tap_packet *pkt;	563	tap_packet *pkt;
553		564
554	pkt = tap->recv ();	565	pkt = tap->recv ();
…		…
561	int dst = mac2id (pkt->dst);	572	int dst = mac2id (pkt->dst);
562	int src = mac2id (pkt->src);	573	int src = mac2id (pkt->src);
563		574
564	if (src != THISNODE->id)	575	if (src != THISNODE->id)
565	{	576	{
566	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	577	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
567	exit (1);	578	exit (EXIT_FAILURE);
568	}	579	}
569		580
570	if (dst == THISNODE->id)	581	if (dst == THISNODE->id)
571	{	582	{
572	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	583	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
573	exit (1);	584	exit (EXIT_FAILURE);
574	}	585	}
575		586
576	if (dst > conns.size ())	587	if (dst > conns.size ())
577	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	588	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
578	else	589	else
579	inject_data_packet (pkt, dst);	590	inject_data_packet (pkt, dst);
580	}	591	}
581		592
582	delete pkt;	593	delete pkt;
583	}	594	}
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	595	else
590	abort ();	596	abort ();
591	}	597	}
592		598
593	void	599	void
…		…
598	if (events & EVENT_SHUTDOWN)	604	if (events & EVENT_SHUTDOWN)
599	{	605	{
600	slog (L_INFO, _("preparing shutdown..."));	606	slog (L_INFO, _("preparing shutdown..."));
601		607
602	shutdown_all ();	608	shutdown_all ();
603
604	remove_pid (pidfilename);	609	remove_pid (conf.pidfilename);
605
606	slog (L_INFO, _("terminating"));	610	slog (L_INFO, _("terminating"));
607		611	exit (EXIT_SUCCESS);
608	exit (0);
609	}	612	}
610		613
611	if (events & EVENT_RECONNECT)	614	if (events & EVENT_RECONNECT)
612	{	615	{
613	slog (L_INFO, _("forced reconnect"));	616	slog (L_INFO, _("forced reconnect"));
…		…
615	reconnect_all ();	618	reconnect_all ();
616	}	619	}
617		620
618	events = 0;	621	events = 0;
619	}	622	}
620
621	w.at = TSTAMP_CANCEL;
622	}	623	}
623		624
624	void	625	void
625	vpn::shutdown_all ()	626	vpn::shutdown_all ()
626	{	627	{
…		…
639	connection_init ();	640	connection_init ();
640		641
641	for (configuration::node_vector::iterator i = conf.nodes.begin ();	642	for (configuration::node_vector::iterator i = conf.nodes.begin ();
642	i != conf.nodes.end (); ++i)	643	i != conf.nodes.end (); ++i)
643	{	644	{
644	connection *conn = new connection (this);	645	connection conn = new connection (this, i);
645
646	conn->conf = *i;
647	conns.push_back (conn);	646	conns.push_back (conn);
648
649	conn->establish_connection ();	647	conn->establish_connection ();
650	}	648	}
651	}	649	}
652		650
653	connection *vpn::find_router ()	651	connection *vpn::find_router ()
…		…
716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	714	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
717	#endif	715	#endif
718	#if ENABLE_ICMP	716	#if ENABLE_ICMP
719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	717	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
720	#endif	718	#endif
		719	#if ENABLE_DNS
		720	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		721	#endif
721	, tap_ev_watcher (this, &vpn::tap_ev)	722	, tap_ev_watcher (this, &vpn::tap_ev)
722	{	723	{
723	}	724	}
724		725
725	vpn::~vpn ()	726	vpn::~vpn ()

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+Changed lines

Comparing gvpe/src/vpn.C (file contents): Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs. Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC