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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 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	Copyright (C) 2003-2008 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 it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	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, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	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 GNU General
13	GNU General Public License for more details.	15	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 along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <list>	34	#include <list>
44		56
45	vpn network; // THE vpn (bad design...)	57	vpn network; // THE vpn (bad design...)
46		58
47	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
48		60
49	const char *vpn::script_if_up ()	61	static void inline
		62	set_tos (int fd, int &tos_prev, int tos)
		63	{
		64	#if defined(SOL_IP) && defined(IP_TOS)
		65	if (tos_prev == tos)
		66	return;
		67
		68	tos_prev = tos;
		69	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		70	#endif
		71	}
		72
		73	void
		74	vpn::script_init_env ()
50	{	75	{
51	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
52	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
53	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57		82
58	char *env;	83	char *env;
59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);	87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu); putenv (env);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	THISNODE->id & 0xff);
69	putenv (env);
70		91
		92	conns [THISNODE->id - 1]->script_init_env ("");
		93
		94	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		95	{
		96	char ext[16];
		97	snprintf (ext, 16, "_%d", (*c)->conf->id);
		98	(*c)->script_init_env (ext);
		99	}
		100	}
		101
		102	inline const char *
		103	vpn::script_if_init ()
		104	{
		105	script_init_env ();
		106
		107	return tap->if_up ();
		108	}
		109
		110	inline const char *
		111	vpn::script_if_up ()
		112	{
		113	script_init_env ();
		114
		115	char *filename;
		116	asprintf (&filename,
		117	"%s/%s",
		118	confbase,
71	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	119	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		120
		121	return filename;
72	}	122	}
73		123
74	int	124	int
75	vpn::setup ()	125	vpn::setup ()
76	{	126	{
		127	int success = 0;
		128
		129	ipv4_tos = -1;
77	ipv4_fd = -1;	130	ipv4_fd = -1;
78		131
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	133	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		135
83	if (ipv4_fd < 0)	136	if (ipv4_fd < 0)
84	return -1;	137	return -1;
85		138
86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
87		141
88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
90	// nor do I fragment myself. Linux still sets DF and doesn't	144	// nor do I fragment myself. Linux still sets DF and doesn't
91	// fragment for me sometimes.	145	// fragment for me sometimes.
…		…
97		151
98	sockinfo si (THISNODE, PROT_IPv4);	152	sockinfo si (THISNODE, PROT_IPv4);
99		153
100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	154	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101	{	155	{
102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	156	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
103	exit (EXIT_FAILURE);	157	exit (EXIT_FAILURE);
104	}	158	}
105		159
106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);	160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
107	}	162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
108		165
		166	udpv4_tos = -1;
109	udpv4_fd = -1;	167	udpv4_fd = -1;
110		168
111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112	{	170	{
113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114		172
115	if (udpv4_fd < 0)	173	if (udpv4_fd < 0)
116	return -1;	174	return -1;
117		175
118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
119		178
120	// standard daemon practise...	179	// standard daemon practise...
121	{	180	{
122	int oval = 1;	181	int oval = 1;
123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
135		194
136	sockinfo si (THISNODE, PROT_UDPv4);	195	sockinfo si (THISNODE, PROT_UDPv4);
137		196
138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	197	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139	{	198	{
140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	199	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
141	exit (EXIT_FAILURE);	200	exit (EXIT_FAILURE);
142	}	201	}
143		202
144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);	203	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		204	++success;
145	}	205	}
		206	else
		207	THISNODE->protocols &= ~PROT_UDPv4;
146		208
		209	icmpv4_tos = -1;
147	icmpv4_fd = -1;	210	icmpv4_fd = -1;
148		211
149	#if ENABLE_ICMP	212	#if ENABLE_ICMP
150	if (THISNODE->protocols & PROT_ICMPv4)	213	if (THISNODE->protocols & PROT_ICMPv4)
151	{	214	{
152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	215	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
153		216
154	if (icmpv4_fd < 0)	217	if (icmpv4_fd < 0)
155	return -1;	218	return -1;
156		219
157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	220	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		221	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
158		222
159	#ifdef ICMP_FILTER	223	#ifdef ICMP_FILTER
160	{	224	{
161	icmp_filter oval;	225	icmp_filter oval;
162	oval.data = 0xffffffff;	226	oval.data = 0xffffffff;
…		…
171	// this I really consider a linux bug. I am neither connected	235	// this I really consider a linux bug. I am neither connected
172	// nor do I fragment myself. Linux still sets DF and doesn't	236	// nor do I fragment myself. Linux still sets DF and doesn't
173	// fragment for me sometimes.	237	// fragment for me sometimes.
174	{	238	{
175	int oval = IP_PMTUDISC_DONT;	239	int oval = IP_PMTUDISC_DONT;
176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	240	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	241	}
178	#endif	242	#endif
179		243
180	sockinfo si (THISNODE, PROT_ICMPv4);	244	sockinfo si (THISNODE, PROT_ICMPv4);
181		245
182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	246	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183	{	247	{
184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	248	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
185	exit (EXIT_FAILURE);	249	exit (EXIT_FAILURE);
186	}	250	}
187		251
188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);	252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
189	}	254	}
190	#endif	255	#endif
191		256
192	tcpv4_fd = -1;	257	tcpv4_fd = -1;
193		258
…		…
198		263
199	if (tcpv4_fd < 0)	264	if (tcpv4_fd < 0)
200	return -1;	265	return -1;
201		266
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
203		269
204	// standard daemon practise...	270	// standard daemon practise...
205	{	271	{
206	int oval = 1;	272	int oval = 1;
207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
209		275
210	sockinfo si (THISNODE, PROT_TCPv4);	276	sockinfo si (THISNODE, PROT_TCPv4);
211		277
212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213	{	279	{
214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	280	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
215	exit (EXIT_FAILURE);	281	exit (EXIT_FAILURE);
216	}	282	}
217		283
218	if (listen (tcpv4_fd, 5))	284	if (listen (tcpv4_fd, 5))
219	{	285	{
220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	286	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
221	exit (EXIT_FAILURE);	287	exit (EXIT_FAILURE);
222	}	288	}
223		289
224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);	290	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		291	++success;
225	}	292	}
		293	else
		294	THISNODE->protocols &= ~PROT_TCPv4;
226	#endif	295	#endif
		296
		297	dnsv4_tos = -1;
		298	dnsv4_fd = -1;
227		299
228	#if ENABLE_DNS	300	#if ENABLE_DNS
229	if (THISNODE->protocols & PROT_DNSv4)	301	if (THISNODE->protocols & PROT_DNSv4)
230	{	302	{
		303	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		304
231	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	305	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
232		306
233	if (dnsv4_fd < 0)	307	if (dnsv4_fd < 0)
234	return -1;	308	return -1;
235		309
		310	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		311	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		312
		313	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		314	// this I really consider a linux bug. I am neither connected
		315	// nor do I fragment myself. Linux still sets DF and doesn't
		316	// fragment for me sometimes.
		317	{
		318	int oval = IP_PMTUDISC_DONT;
		319	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		320	}
		321	# endif
		322
236	// standard daemon practise...	323	// standard daemon practise...
237	{	324	{
238	int oval = 1;	325	int oval = 1;
239	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	326	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
240	}	327	}
241		328
242	sockinfo si (THISNODE, PROT_DNSv4);	329	sockinfo si (THISNODE->dns_hostname,
		330	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		331	PROT_DNSv4);
243		332
244	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))	333	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
245	{	334	{
246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));	335	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
247	exit (EXIT_FAILURE);	336	exit (EXIT_FAILURE);
248	}	337	}
249		338
250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);	339	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		340	++success;
		341	}
		342	#endif
		343
		344	/////////////////////////////////////////////////////////////////////////////
		345
		346	if (!success)
251	}	347	{
252	#endif	348	slog (L_ERR, _("no protocols enabled, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
		352	reconnect_all ();
		353
		354	/////////////////////////////////////////////////////////////////////////////
253		355
254	tap = new tap_device ();	356	tap = new tap_device ();
255	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
256	{	358	{
257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
258	exit (EXIT_FAILURE);	360	exit (EXIT_FAILURE);
259	}	361	}
260		362
261	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
262		364
		365	run_script_cb cb;
		366	cb.set<vpn, &vpn::script_if_init> (this);
		367
		368	if (tap->if_up () &&
		369	!run_script (cb, true))
		370	{
		371	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		372	tap->if_up ());
		373	exit (EXIT_FAILURE);
		374	}
		375
		376	cb.set<vpn, &vpn::script_if_up> (this);
		377	if (!run_script (cb, true))
		378	{
		379	slog (L_ERR, _("if-up command execution failed, exiting."));
		380	exit (EXIT_FAILURE);
		381	}
		382
263	tap_ev_watcher.start (tap->fd, EVENT_READ);	383	tap_ev_watcher.start (tap->fd, EV_READ);
264
265	reconnect_all ();
266		384
267	return 0;	385	return 0;
268	}
269
270	// send a vpn packet out to other hosts
271	bool
272	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
273	{
274	switch (si.prot)
275	{
276	case PROT_IPv4:
277	return send_ipv4_packet (pkt, si, tos);
278
279	case PROT_UDPv4:
280	return send_udpv4_packet (pkt, si, tos);
281
282	#if ENABLE_TCP
283	case PROT_TCPv4:
284	return send_tcpv4_packet (pkt, si, tos);
285	#endif
286
287	#if ENABLE_ICMP
288	case PROT_ICMPv4:
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);
295	#endif
296
297	default:
298	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
299	return false;
300	}
301	}	386	}
302		387
303	bool	388	bool
304	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	389	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
305	{	390	{
306	#if defined(SOL_IP) && defined(IP_TOS)	391	set_tos (ipv4_fd, ipv4_tos, tos);
307	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
308	#endif
309	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	392	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
310		393
311	return true;	394	return true;
312	}	395	}
313		396
…		…
336		419
337	#if ENABLE_ICMP	420	#if ENABLE_ICMP
338	bool	421	bool
339	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	422	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
340	{	423	{
341	#if defined(SOL_IP) && defined(IP_TOS)
342	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
343	#endif
344
345	pkt->unshift_hdr (4);	424	pkt->unshift_hdr (4);
346		425
347	icmp_header hdr = (icmp_header )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
348	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
349	hdr->code = 255;	428	hdr->code = 255;
350	hdr->checksum = 0;	429	hdr->checksum = 0;
351	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
352		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
353	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	433	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
354		434
355	return true;	435	return true;
356	}	436	}
357	#endif	437	#endif
358		438
359	bool	439	bool
360	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	440	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
361	{	441	{
362	#if defined(SOL_IP) && defined(IP_TOS)	442	set_tos (udpv4_fd, udpv4_tos, tos);
363	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
364	#endif
365	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	443	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
366		444
367	return true;	445	return true;
368	}	446	}
369		447
…		…
380	{	458	{
381	// broadcast, this is ugly, but due to the security policy	459	// broadcast, this is ugly, but due to the security policy
382	// we have to connect to all hosts...	460	// we have to connect to all hosts...
383	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	461	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
384	if ((*c)->conf != THISNODE)	462	if ((*c)->conf != THISNODE)
385	(*c)->inject_data_packet (pkt, true);	463	(*c)->inject_data_packet (pkt);
386	}	464	}
387	}	465	}
388		466
389	void	467	void
390	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
391	{	469	{
392	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
393	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
394		472
395	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	473	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
396	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
397		475
398	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
399	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
400	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
401	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	479	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
402	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
403	else if (dst > conns.size ())	481	else if (dst > conns.size ())
404	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	482	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
405	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
406	else	484	else
407	{	485	{
408	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
409		487
410	if (dst == 0)	488	if (dst == 0)
411	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
412	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
413	else if (dst != THISNODE->id)	491	else if (dst != THISNODE->id)
414	{	492	{
415	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
416	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
417	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
418	else	496	else
419	slog (L_WARN,	497	slog (L_WARN,
420	_("%s(%s): forwarding request (=> %s), but we are no router"),	498	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
421	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
422	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
423	}	501	}
424	else	502	else
425	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
426	}	504	}
427	}	505	}
428		506
429	void	507	bool
		508	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		509	{
		510	switch (si.prot)
		511	{
		512	case PROT_IPv4:
		513	return send_ipv4_packet (pkt, si, tos);
		514
		515	case PROT_UDPv4:
		516	return send_udpv4_packet (pkt, si, tos);
		517
		518	#if ENABLE_TCP
		519	case PROT_TCPv4:
		520	return send_tcpv4_packet (pkt, si, tos);
		521	#endif
		522	#if ENABLE_ICMP
		523	case PROT_ICMPv4:
		524	return send_icmpv4_packet (pkt, si, tos);
		525	#endif
		526	#if ENABLE_DNS
		527	case PROT_DNSv4:
		528	return send_dnsv4_packet (pkt, si, tos);
		529	#endif
		530	default:
		531	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		532	}
		533
		534	return false;
		535	}
		536
		537	inline void
430	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
431	{	539	{
432	if (revents & EVENT_READ)	540	if (revents & EV_READ)
433	{	541	{
434	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
435	struct sockaddr_in sa;	543	struct sockaddr_in sa;
436	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
437	int len;	545	int len;
…		…
442		550
443	if (len > 0)	551	if (len > 0)
444	{	552	{
445	pkt->len = len;	553	pkt->len = len;
446		554
447	// raw sockets deliver the ipv4, but don't expect it on sends	555	// raw sockets deliver the ipv4 header, but don't expect it on sends
448	// this is slow, but...
449	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
450		557
451	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
452	}	559	}
453	else	560	else
454	{	561	{
455	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
456	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
457	}	564	}
458		565
459	delete pkt;	566	delete pkt;
460	}	567	}
461	else	568	else
462	{	569	{
463	slog (L_ERR,	570	slog (L_ERR,
464	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
465	revents);	572	revents);
466	exit (EXIT_FAILURE);	573	exit (EXIT_FAILURE);
467	}	574	}
468	}	575	}
469		576
470	#if ENABLE_ICMP	577	#if ENABLE_ICMP
471	void	578	inline void
472	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
473	{	580	{
474	if (revents & EVENT_READ)	581	if (revents & EV_READ)
475	{	582	{
476	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
477	struct sockaddr_in sa;	584	struct sockaddr_in sa;
478	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
479	int len;	586	int len;
…		…
499	}	606	}
500	}	607	}
501	else	608	else
502	{	609	{
503	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
504	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
505	}	612	}
506		613
507	delete pkt;	614	delete pkt;
508	}	615	}
509	else	616	else
510	{	617	{
511	slog (L_ERR,	618	slog (L_ERR,
512	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
513	revents);	620	revents);
514	exit (EXIT_FAILURE);	621	exit (EXIT_FAILURE);
515	}	622	}
516	}	623	}
517	#endif	624	#endif
518		625
519	void	626	inline void
520	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
521	{	628	{
522	if (revents & EVENT_READ)	629	if (revents & EV_READ)
523	{	630	{
524	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
525	struct sockaddr_in sa;	632	struct sockaddr_in sa;
526	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
527	int len;	634	int len;
…		…
537	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
538	}	645	}
539	else	646	else
540	{	647	{
541	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
542	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	649	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
543	}	650	}
544		651
545	delete pkt;	652	delete pkt;
546	}	653	}
547	else	654	else
548	{	655	{
549	slog (L_ERR,	656	slog (L_ERR,
550	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
551	revents);	658	revents);
552	exit (EXIT_FAILURE);	659	exit (EXIT_FAILURE);
553	}	660	}
554	}	661	}
555		662
556	void	663	inline void
557	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
558	{	665	{
559	if (revents & EVENT_READ)	666	if (revents & EV_READ)
560	{	667	{
561	/* process data */	668	/* process data */
562	tap_packet *pkt;	669	tap_packet *pkt;
563		670
564	pkt = tap->recv ();	671	pkt = tap->recv ();
…		…
571	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
572	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
573		680
574	if (src != THISNODE->id)	681	if (src != THISNODE->id)
575	{	682	{
576	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
577	exit (EXIT_FAILURE);	684	exit (EXIT_FAILURE);
578	}	685	}
579		686
580	if (dst == THISNODE->id)	687	if (dst == THISNODE->id)
581	{	688	{
…		…
593	}	700	}
594	else	701	else
595	abort ();	702	abort ();
596	}	703	}
597		704
598	void	705	inline void
599	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
600	{	707	{
601	if (events)	708	if (events)
602	{	709	{
603	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
604	{	711	{
605	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
606		713
607	shutdown_all ();	714	shutdown_all ();
608	remove_pid (conf.pidfilename);	715	remove_pid (conf.pidfilename);
609	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
610	exit (EXIT_SUCCESS);	717	exit (EXIT_SUCCESS);
611	}	718	}
612		719
613	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
614	{	721	{
615	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
616		723
617	reconnect_all ();	724	reconnect_all ();
618	}	725	}
619		726
620	events = 0;	727	events = 0;
…		…
636		743
637	conns.clear ();	744	conns.clear ();
638		745
639	connection_init ();	746	connection_init ();
640		747
641	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
642	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
643	{
644	connection *conn = new connection (this);
645		750
646	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
647	conns.push_back (conn);
648
649	conn->establish_connection ();	752	(*c)->establish_connection ();
650	}
651	}	753	}
652		754
653	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
654	{	756	{
655	u32 prio = 1;	757	return src != dst
		758	&& src->may_direct (dst)
		759	&& dst->may_direct (src)
		760	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		761	\|\| (src->protocols & dst->connectable_protocols ()));
		762	}
		763
		764	// only works for indirect and routed connections: find a router
		765	// from THISNODE to dst
		766	connection vpn::find_router_for (const connection dst)
		767	{
656	connection *router = 0;	768	connection *router = 0;
657		769
		770	// first try to find a router with a direct connection
		771	{
		772	u32 prio = 1;
		773
		774	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		775	{
		776	connection c = i;
		777
		778	if (c->conf->routerprio > prio
		779	&& c->conf != THISNODE
		780	&& c != dst
		781	&& can_direct (c->conf, dst->conf))
		782	{
		783	if (c->ictx && c->octx)
		784	{
		785	prio = c->conf->routerprio;
		786	router = c;
		787	}
		788	else
		789	c->establish_connection ();
		790	}
		791	}
		792	}
		793
		794	if (router)
		795	return router;
		796
		797	// second try find the router with the highest priority higher than ours
		798	{
		799	u32 prio = 1;
		800
		801	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		802	{
		803	connection c = i;
		804
		805	if (c->conf->routerprio > prio
		806	&& c->conf->routerprio > THISNODE->routerprio
		807	&& c != dst
		808	&& c->conf != THISNODE)
		809	{
		810	if (c->ictx && c->octx)
		811	{
		812	prio = c->conf->routerprio;
		813	router = c;
		814	}
		815	else
		816	c->establish_connection ();
		817	}
		818	}
		819	}
		820	return router;
		821	}
		822
		823	void vpn::connection_established (connection *c)
		824	{
658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
659	{	826	{
660	connection c = i;	827	connection o = i;
661		828
662	if (c->conf->routerprio > prio	829	if (!o->is_direct
663	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
664	&& c->ictx && c->octx	831	&& c->si != o->si
665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
666	{
667	prio = c->conf->routerprio;
668	router = c;
669	}	833	{
		834	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		835	o->conf->nodename, c->conf->nodename);
		836	o->rekey ();
		837	}
670	}	838	}
671
672	return router;
673	}	839	}
674		840
675	void vpn::send_connect_request (int id)	841	void vpn::send_connect_request (connection *c)
676	{	842	{
677	connection *c = find_router ();	843	connection *r = find_router_for (c);
678		844
679	if (c)	845	if (r)
		846	{
		847	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		848	c->conf->nodename, r->conf->nodename);
680	c->send_connect_request (id);	849	r->send_connect_request (c->conf->id);
		850	}
681	else	851	else
682	// no router found, aggressively connect to all routers	852	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	853	c->conf->nodename);
684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
685	(*i)->establish_connection ();
686	}	854	}
687		855
688	void	856	void
689	connection::dump_status ()	857	connection::dump_status ()
690	{	858	{
691	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
692	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
693	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
694	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	862	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
695	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
696	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
697	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
698	}	864	}
699		865
700	void	866	void
701	vpn::dump_status ()	867	vpn::dump_status ()
702	{	868	{
703	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
704		870
705	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
706	(*c)->dump_status ();	872	(*c)->dump_status ();
707		873
708	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
709	}	875	}
710		876
711	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
712	: event (this, &vpn::event_cb)	879	event .set<vpn, &vpn::event_cb > (this);
713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
715	#if ENABLE_TCP	882	#if ENABLE_TCP
716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
717	#endif	884	#endif
718	#if ENABLE_ICMP	885	#if ENABLE_ICMP
719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
720	#endif	887	#endif
721	#if ENABLE_DNS	888	#if ENABLE_DNS
722	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)	889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
723	#endif	890	#endif
724	, tap_ev_watcher (this, &vpn::tap_ev)	891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
725	{
726	}	892	}
727		893
728	vpn::~vpn ()	894	vpn::~vpn ()
729	{	895	{
730	}	896	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC vs. Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC