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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.23 by pcg, Thu Jan 29 18:55:10 2004 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 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	ipv4_tos = -1;
77	ipv4_fd = -1;	128	ipv4_fd = -1;
78		129
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	131	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		133
83	if (ipv4_fd < 0)	134	if (ipv4_fd < 0)
84	return -1;	135	return -1;
85		136
86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
87		139
88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
90	// nor do I fragment myself. Linux still sets DF and doesn't	142	// nor do I fragment myself. Linux still sets DF and doesn't
91	// fragment for me sometimes.	143	// fragment for me sometimes.
…		…
97		149
98	sockinfo si (THISNODE, PROT_IPv4);	150	sockinfo si (THISNODE, PROT_IPv4);
99		151
100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101	{	153	{
102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	154	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
103	exit (EXIT_FAILURE);	155	exit (EXIT_FAILURE);
104	}	156	}
105		157
106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
107	}	159	}
108		160
		161	udpv4_tos = -1;
109	udpv4_fd = -1;	162	udpv4_fd = -1;
110		163
111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112	{	165	{
113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114		167
115	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
116	return -1;	169	return -1;
117		170
118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
119		173
120	// standard daemon practise...	174	// standard daemon practise...
121	{	175	{
122	int oval = 1;	176	int oval = 1;
123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
135		189
136	sockinfo si (THISNODE, PROT_UDPv4);	190	sockinfo si (THISNODE, PROT_UDPv4);
137		191
138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139	{	193	{
140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	194	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
141	exit (EXIT_FAILURE);	195	exit (EXIT_FAILURE);
142	}	196	}
143		197
144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);	198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
145	}	199	}
146		200
		201	icmpv4_tos = -1;
147	icmpv4_fd = -1;	202	icmpv4_fd = -1;
148		203
149	#if ENABLE_ICMP	204	#if ENABLE_ICMP
150	if (THISNODE->protocols & PROT_ICMPv4)	205	if (THISNODE->protocols & PROT_ICMPv4)
151	{	206	{
152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
153		208
154	if (icmpv4_fd < 0)	209	if (icmpv4_fd < 0)
155	return -1;	210	return -1;
156		211
157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
158		214
159	#ifdef ICMP_FILTER	215	#ifdef ICMP_FILTER
160	{	216	{
161	icmp_filter oval;	217	icmp_filter oval;
162	oval.data = 0xffffffff;	218	oval.data = 0xffffffff;
…		…
171	// this I really consider a linux bug. I am neither connected	227	// this I really consider a linux bug. I am neither connected
172	// nor do I fragment myself. Linux still sets DF and doesn't	228	// nor do I fragment myself. Linux still sets DF and doesn't
173	// fragment for me sometimes.	229	// fragment for me sometimes.
174	{	230	{
175	int oval = IP_PMTUDISC_DONT;	231	int oval = IP_PMTUDISC_DONT;
176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	233	}
178	#endif	234	#endif
179		235
180	sockinfo si (THISNODE, PROT_ICMPv4);	236	sockinfo si (THISNODE, PROT_ICMPv4);
181		237
182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183	{	239	{
184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	240	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
185	exit (EXIT_FAILURE);	241	exit (EXIT_FAILURE);
186	}	242	}
187		243
188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
189	}	245	}
190	#endif	246	#endif
191		247
192	tcpv4_fd = -1;	248	tcpv4_fd = -1;
193		249
…		…
198		254
199	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
200	return -1;	256	return -1;
201		257
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
203		260
204	// standard daemon practise...	261	// standard daemon practise...
205	{	262	{
206	int oval = 1;	263	int oval = 1;
207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
209		266
210	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
211		268
212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213	{	270	{
214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	271	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
215	exit (EXIT_FAILURE);	272	exit (EXIT_FAILURE);
216	}	273	}
217		274
218	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
219	{	276	{
220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	277	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
221	exit (EXIT_FAILURE);	278	exit (EXIT_FAILURE);
222	}	279	}
223		280
224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);	281	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		282	}
		283	#endif
		284
		285	dnsv4_tos = -1;
		286	dnsv4_fd = -1;
		287
		288	#if ENABLE_DNS
		289	if (THISNODE->protocols & PROT_DNSv4)
		290	{
		291	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		292
		293	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		294
		295	if (dnsv4_fd < 0)
		296	return -1;
		297
		298	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		299	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		300
		301	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		302	// this I really consider a linux bug. I am neither connected
		303	// nor do I fragment myself. Linux still sets DF and doesn't
		304	// fragment for me sometimes.
		305	{
		306	int oval = IP_PMTUDISC_DONT;
		307	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
225	}	308	}
226	#endif	309	# endif
		310
		311	// standard daemon practise...
		312	{
		313	int oval = 1;
		314	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		315	}
		316
		317	sockinfo si (THISNODE->dns_hostname,
		318	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		319	PROT_DNSv4);
		320
		321	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		322	{
		323	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		324	exit (EXIT_FAILURE);
		325	}
		326
		327	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		328	}
		329	#endif
		330
		331	/////////////////////////////////////////////////////////////////////////////
		332
		333	reconnect_all ();
		334
		335	/////////////////////////////////////////////////////////////////////////////
227		336
228	tap = new tap_device ();	337	tap = new tap_device ();
229	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
230	{	339	{
231	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
232	exit (EXIT_FAILURE);	341	exit (EXIT_FAILURE);
233	}	342	}
234		343
235	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
236		345
		346	run_script_cb cb;
		347	cb.set<vpn, &vpn::script_if_init> (this);
		348
		349	if (tap->if_up () &&
		350	!run_script (cb, true))
		351	{
		352	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		353	tap->if_up ());
		354	exit (EXIT_FAILURE);
		355	}
		356
		357	cb.set<vpn, &vpn::script_if_up> (this);
		358	if (!run_script (cb, true))
		359	{
		360	slog (L_ERR, _("if-up command execution failed, exiting."));
		361	exit (EXIT_FAILURE);
		362	}
		363
237	tap_ev_watcher.start (tap->fd, EVENT_READ);	364	tap_ev_watcher.start (tap->fd, EV_READ);
238
239	reconnect_all ();
240		365
241	return 0;	366	return 0;
242	}
243
244	// send a vpn packet out to other hosts
245	bool
246	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
247	{
248	switch (si.prot)
249	{
250	case PROT_IPv4:
251	return send_ipv4_packet (pkt, si, tos);
252
253	case PROT_UDPv4:
254	return send_udpv4_packet (pkt, si, tos);
255
256	#if ENABLE_TCP
257	case PROT_TCPv4:
258	return send_tcpv4_packet (pkt, si, tos);
259	#endif
260
261	#if ENABLE_ICMP
262	case PROT_ICMPv4:
263	return send_icmpv4_packet (pkt, si, tos);
264	#endif
265
266	default:
267	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
268	return false;
269	}
270	}	367	}
271		368
272	bool	369	bool
273	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	370	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
274	{	371	{
275	#if defined(SOL_IP) && defined(IP_TOS)	372	set_tos (ipv4_fd, ipv4_tos, tos);
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
277	#endif
278	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	373	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
279		374
280	return true;	375	return true;
281	}	376	}
282		377
…		…
305		400
306	#if ENABLE_ICMP	401	#if ENABLE_ICMP
307	bool	402	bool
308	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	403	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
309	{	404	{
310	#if defined(SOL_IP) && defined(IP_TOS)
311	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
312	#endif
313
314	pkt->unshift_hdr (4);	405	pkt->unshift_hdr (4);
315		406
316	icmp_header hdr = (icmp_header )&((*pkt)[0]);	407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
317	hdr->type = ::conf.icmp_type;	408	hdr->type = ::conf.icmp_type;
318	hdr->code = 255;	409	hdr->code = 255;
319	hdr->checksum = 0;	410	hdr->checksum = 0;
320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
321		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
322	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	414	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
323		415
324	return true;	416	return true;
325	}	417	}
326	#endif	418	#endif
327		419
328	bool	420	bool
329	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	421	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
330	{	422	{
331	#if defined(SOL_IP) && defined(IP_TOS)	423	set_tos (udpv4_fd, udpv4_tos, tos);
332	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333	#endif
334	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	424	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335		425
336	return true;	426	return true;
337	}	427	}
338		428
…		…
349	{	439	{
350	// broadcast, this is ugly, but due to the security policy	440	// broadcast, this is ugly, but due to the security policy
351	// we have to connect to all hosts...	441	// we have to connect to all hosts...
352	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
353	if ((*c)->conf != THISNODE)	443	if ((*c)->conf != THISNODE)
354	(*c)->inject_data_packet (pkt, true);	444	(*c)->inject_data_packet (pkt);
355	}	445	}
356	}	446	}
357		447
358	void	448	void
359	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
360	{	450	{
361	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
362	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
363		453
364	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	454	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
365	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
366		456
367	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
368	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
369	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
370	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	460	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
371	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
372	else if (dst > conns.size ())	462	else if (dst > conns.size ())
373	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	463	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
375	else	465	else
376	{	466	{
377	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
378		468
379	if (dst == 0)	469	if (dst == 0)
380	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
381	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
382	else if (dst != THISNODE->id)	472	else if (dst != THISNODE->id)
383	{	473	{
384	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
385	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
386	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
387	else	477	else
388	slog (L_WARN,	478	slog (L_WARN,
389	_("%s(%s): forwarding request (=> %s), but we are no router"),	479	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
390	c->conf->nodename, (const char *)rsi,	480	c->conf->nodename, (const char *)rsi,
391	conns[dst - 1]->conf->nodename);	481	conns[dst - 1]->conf->nodename);
392	}	482	}
393	else	483	else
394	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
395	}	485	}
396	}	486	}
397		487
398	void	488	bool
		489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		490	{
		491	switch (si.prot)
		492	{
		493	case PROT_IPv4:
		494	return send_ipv4_packet (pkt, si, tos);
		495
		496	case PROT_UDPv4:
		497	return send_udpv4_packet (pkt, si, tos);
		498
		499	#if ENABLE_TCP
		500	case PROT_TCPv4:
		501	return send_tcpv4_packet (pkt, si, tos);
		502	#endif
		503	#if ENABLE_ICMP
		504	case PROT_ICMPv4:
		505	return send_icmpv4_packet (pkt, si, tos);
		506	#endif
		507	#if ENABLE_DNS
		508	case PROT_DNSv4:
		509	return send_dnsv4_packet (pkt, si, tos);
		510	#endif
		511	default:
		512	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		513	}
		514
		515	return false;
		516	}
		517
		518	inline void
399	vpn::ipv4_ev (io_watcher &w, short revents)	519	vpn::ipv4_ev (ev::io &w, int revents)
400	{	520	{
401	if (revents & EVENT_READ)	521	if (revents & EV_READ)
402	{	522	{
403	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
404	struct sockaddr_in sa;	524	struct sockaddr_in sa;
405	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
406	int len;	526	int len;
…		…
411		531
412	if (len > 0)	532	if (len > 0)
413	{	533	{
414	pkt->len = len;	534	pkt->len = len;
415		535
416	// raw sockets deliver the ipv4, but don't expect it on sends	536	// raw sockets deliver the ipv4 header, but don't expect it on sends
417	// this is slow, but...
418	pkt->skip_hdr (IP_OVERHEAD);	537	pkt->skip_hdr (IP_OVERHEAD);
419		538
420	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
421	}	540	}
422	else	541	else
423	{	542	{
424	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
425	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
426	}	545	}
427		546
428	delete pkt;	547	delete pkt;
429	}	548	}
430	else	549	else
431	{	550	{
432	slog (L_ERR,	551	slog (L_ERR,
433	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
434	revents);	553	revents);
435	exit (EXIT_FAILURE);	554	exit (EXIT_FAILURE);
436	}	555	}
437	}	556	}
438		557
439	#if ENABLE_ICMP	558	#if ENABLE_ICMP
440	void	559	inline void
441	vpn::icmpv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
442	{	561	{
443	if (revents & EVENT_READ)	562	if (revents & EV_READ)
444	{	563	{
445	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
446	struct sockaddr_in sa;	565	struct sockaddr_in sa;
447	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
448	int len;	567	int len;
…		…
468	}	587	}
469	}	588	}
470	else	589	else
471	{	590	{
472	// probably ECONNRESET or somesuch	591	// probably ECONNRESET or somesuch
473	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
474	}	593	}
475		594
476	delete pkt;	595	delete pkt;
477	}	596	}
478	else	597	else
479	{	598	{
480	slog (L_ERR,	599	slog (L_ERR,
481	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, exiting.\n"),
482	revents);	601	revents);
483	exit (EXIT_FAILURE);	602	exit (EXIT_FAILURE);
484	}	603	}
485	}	604	}
486	#endif	605	#endif
487		606
488	void	607	inline void
489	vpn::udpv4_ev (io_watcher &w, short revents)	608	vpn::udpv4_ev (ev::io &w, int revents)
490	{	609	{
491	if (revents & EVENT_READ)	610	if (revents & EV_READ)
492	{	611	{
493	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
494	struct sockaddr_in sa;	613	struct sockaddr_in sa;
495	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
496	int len;	615	int len;
…		…
506	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
507	}	626	}
508	else	627	else
509	{	628	{
510	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
511	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	630	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
512	}	631	}
513		632
514	delete pkt;	633	delete pkt;
515	}	634	}
516	else	635	else
517	{	636	{
518	slog (L_ERR,	637	slog (L_ERR,
519	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
520	revents);	639	revents);
521	exit (EXIT_FAILURE);	640	exit (EXIT_FAILURE);
522	}	641	}
523	}	642	}
524		643
525	void	644	inline void
526	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
527	{	646	{
528	if (revents & EVENT_READ)	647	if (revents & EV_READ)
529	{	648	{
530	/* process data */	649	/* process data */
531	tap_packet *pkt;	650	tap_packet *pkt;
532		651
533	pkt = tap->recv ();	652	pkt = tap->recv ();
…		…
540	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
541	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
542		661
543	if (src != THISNODE->id)	662	if (src != THISNODE->id)
544	{	663	{
545	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
546	exit (EXIT_FAILURE);	665	exit (EXIT_FAILURE);
547	}	666	}
548		667
549	if (dst == THISNODE->id)	668	if (dst == THISNODE->id)
550	{	669	{
…		…
562	}	681	}
563	else	682	else
564	abort ();	683	abort ();
565	}	684	}
566		685
567	void	686	inline void
568	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
569	{	688	{
570	if (events)	689	if (events)
571	{	690	{
572	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
573	{	692	{
574	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
575		694
576	shutdown_all ();	695	shutdown_all ();
577	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
578	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
579	exit (EXIT_SUCCESS);	698	exit (EXIT_SUCCESS);
580	}	699	}
581		700
582	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
583	{	702	{
584	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
585		704
586	reconnect_all ();	705	reconnect_all ();
587	}	706	}
588		707
589	events = 0;	708	events = 0;
…		…
605		724
606	conns.clear ();	725	conns.clear ();
607		726
608	connection_init ();	727	connection_init ();
609		728
610	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
611	i != conf.nodes.end (); ++i)	730	conns.push_back (new connection (this, *i));
612	{
613	connection *conn = new connection (this);
614		731
615	conn->conf = *i;	732	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
616	conns.push_back (conn);
617
618	conn->establish_connection ();	733	(*c)->establish_connection ();
619	}
620	}	734	}
621		735
622	connection *vpn::find_router ()	736	bool vpn::can_direct (conf_node src, conf_node dst) const
623	{	737	{
624	u32 prio = 1;	738	return src != dst
		739	&& src->may_direct (dst)
		740	&& dst->may_direct (src)
		741	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		742	\|\| (src->protocols & dst->connectable_protocols ()));
		743	}
		744
		745	// only works for indirect and routed connections: find a router
		746	// from THISNODE to dst
		747	connection vpn::find_router_for (const connection dst)
		748	{
625	connection *router = 0;	749	connection *router = 0;
626		750
		751	// first try to find a router with a direct connection
		752	{
		753	u32 prio = 1;
		754
		755	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		756	{
		757	connection c = i;
		758
		759	if (c->conf->routerprio > prio
		760	&& c->conf != THISNODE
		761	&& c != dst
		762	&& can_direct (c->conf, dst->conf))
		763	{
		764	if (c->ictx && c->octx)
		765	{
		766	prio = c->conf->routerprio;
		767	router = c;
		768	}
		769	else
		770	c->establish_connection ();
		771	}
		772	}
		773	}
		774
		775	if (router)
		776	return router;
		777
		778	// second try find the router with the highest priority higher than ours
		779	{
		780	u32 prio = 1;
		781
		782	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		783	{
		784	connection c = i;
		785
		786	if (c->conf->routerprio > prio
		787	&& c->conf->routerprio > THISNODE->routerprio
		788	&& c != dst
		789	&& c->conf != THISNODE)
		790	{
		791	if (c->ictx && c->octx)
		792	{
		793	prio = c->conf->routerprio;
		794	router = c;
		795	}
		796	else
		797	c->establish_connection ();
		798	}
		799	}
		800	}
		801	return router;
		802	}
		803
		804	void vpn::connection_established (connection *c)
		805	{
627	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	806	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
628	{	807	{
629	connection c = i;	808	connection o = i;
630		809
631	if (c->conf->routerprio > prio	810	if (!o->is_direct
632	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	811	&& o->si.valid ()
633	&& c->ictx && c->octx	812	&& c->si != o->si
634	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	813	&& c == find_router_for (o))
635	{
636	prio = c->conf->routerprio;
637	router = c;
638	}	814	{
		815	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		816	o->conf->nodename, c->conf->nodename);
		817	o->rekey ();
		818	}
639	}	819	}
640
641	return router;
642	}	820	}
643		821
644	void vpn::send_connect_request (int id)	822	void vpn::send_connect_request (connection *c)
645	{	823	{
646	connection *c = find_router ();	824	connection *r = find_router_for (c);
647		825
648	if (c)	826	if (r)
		827	{
		828	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		829	c->conf->nodename, r->conf->nodename);
649	c->send_connect_request (id);	830	r->send_connect_request (c->conf->id);
		831	}
650	else	832	else
651	// no router found, aggressively connect to all routers	833	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
652	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	834	c->conf->nodename);
653	if ((i)->conf->routerprio && (i)->conf != THISNODE)
654	(*i)->establish_connection ();
655	}	835	}
656		836
657	void	837	void
658	connection::dump_status ()	838	connection::dump_status ()
659	{	839	{
660	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	840	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
661	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	841	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
662	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	842	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
663	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	843	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
664	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	844	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
665	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
666	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
667	}	845	}
668		846
669	void	847	void
670	vpn::dump_status ()	848	vpn::dump_status ()
671	{	849	{
672	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	850	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
673		851
674	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	852	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
675	(*c)->dump_status ();	853	(*c)->dump_status ();
676		854
677	slog (L_NOTICE, _("END status dump"));	855	slog (L_NOTICE, _("END status dump"));
678	}	856	}
679		857
680	vpn::vpn (void)	858	vpn::vpn (void)
		859	{
681	: event (this, &vpn::event_cb)	860	event .set<vpn, &vpn::event_cb > (this);
682	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	861	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
683	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	862	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
684	#if ENABLE_TCP	863	#if ENABLE_TCP
685	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	864	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
686	#endif	865	#endif
687	#if ENABLE_ICMP	866	#if ENABLE_ICMP
688	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	867	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
689	#endif	868	#endif
690	, tap_ev_watcher (this, &vpn::tap_ev)	869	#if ENABLE_DNS
691	{	870	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		871	#endif
		872	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
692	}	873	}
693		874
694	vpn::~vpn ()	875	vpn::~vpn ()
695	{	876	{
696	}	877	}

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/vpn.C (file contents): Revision 1.23 by pcg, Thu Jan 29 18:55:10 2004 UTC vs. Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.23 by pcg, Thu Jan 29 18:55:10 2004 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC