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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.27 by pcg, Tue Mar 1 06:27:20 2005 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	}	386	}
269		387
270	bool	388	bool
271	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)
272	{	390	{
273	#if defined(SOL_IP) && defined(IP_TOS)	391	set_tos (ipv4_fd, ipv4_tos, tos);
274	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
275	#endif
276	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 ());
277		393
278	return true;	394	return true;
279	}	395	}
280		396
…		…
303		419
304	#if ENABLE_ICMP	420	#if ENABLE_ICMP
305	bool	421	bool
306	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)
307	{	423	{
308	#if defined(SOL_IP) && defined(IP_TOS)
309	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
310	#endif
311
312	pkt->unshift_hdr (4);	424	pkt->unshift_hdr (4);
313		425
314	icmp_header hdr = (icmp_header )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
315	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
316	hdr->code = 255;	428	hdr->code = 255;
317	hdr->checksum = 0;	429	hdr->checksum = 0;
318	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
319		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
320	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 ());
321		434
322	return true;	435	return true;
323	}	436	}
324	#endif	437	#endif
325		438
326	bool	439	bool
327	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)
328	{	441	{
329	#if defined(SOL_IP) && defined(IP_TOS)	442	set_tos (udpv4_fd, udpv4_tos, tos);
330	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
331	#endif
332	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 ());
333		444
334	return true;	445	return true;
335	}	446	}
336		447
…		…
347	{	458	{
348	// broadcast, this is ugly, but due to the security policy	459	// broadcast, this is ugly, but due to the security policy
349	// we have to connect to all hosts...	460	// we have to connect to all hosts...
350	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	461	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
351	if ((*c)->conf != THISNODE)	462	if ((*c)->conf != THISNODE)
352	(*c)->inject_data_packet (pkt, true);	463	(*c)->inject_data_packet (pkt);
353	}	464	}
354	}	465	}
355		466
356	void	467	void
357	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
358	{	469	{
359	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
360	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
361		472
362	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."),
363	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
364		475
365	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
366	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
367	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
368	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)."),
369	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
370	else if (dst > conns.size ())	481	else if (dst > conns.size ())
371	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)."),
372	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
373	else	484	else
374	{	485	{
375	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
376		487
377	if (dst == 0)	488	if (dst == 0)
378	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
379	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
380	else if (dst != THISNODE->id)	491	else if (dst != THISNODE->id)
381	{	492	{
382	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
383	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
384	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
385	else	496	else
386	slog (L_WARN,	497	slog (L_WARN,
387	_("%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?)."),
388	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
389	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
390	}	501	}
391	else	502	else
392	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
393	}	504	}
394	}	505	}
395		506
396	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
397	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
398	{	539	{
399	if (revents & EVENT_READ)	540	if (revents & EV_READ)
400	{	541	{
401	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
402	struct sockaddr_in sa;	543	struct sockaddr_in sa;
403	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
404	int len;	545	int len;
…		…
409		550
410	if (len > 0)	551	if (len > 0)
411	{	552	{
412	pkt->len = len;	553	pkt->len = len;
413		554
414	// 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
415	// this is slow, but...
416	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
417		557
418	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
419	}	559	}
420	else	560	else
421	{	561	{
422	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
423	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
424	}	564	}
425		565
426	delete pkt;	566	delete pkt;
427	}	567	}
428	else	568	else
429	{	569	{
430	slog (L_ERR,	570	slog (L_ERR,
431	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
432	revents);	572	revents);
433	exit (EXIT_FAILURE);	573	exit (EXIT_FAILURE);
434	}	574	}
435	}	575	}
436		576
437	#if ENABLE_ICMP	577	#if ENABLE_ICMP
438	void	578	inline void
439	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
440	{	580	{
441	if (revents & EVENT_READ)	581	if (revents & EV_READ)
442	{	582	{
443	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
444	struct sockaddr_in sa;	584	struct sockaddr_in sa;
445	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
446	int len;	586	int len;
…		…
466	}	606	}
467	}	607	}
468	else	608	else
469	{	609	{
470	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
471	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
472	}	612	}
473		613
474	delete pkt;	614	delete pkt;
475	}	615	}
476	else	616	else
477	{	617	{
478	slog (L_ERR,	618	slog (L_ERR,
479	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
480	revents);	620	revents);
481	exit (EXIT_FAILURE);	621	exit (EXIT_FAILURE);
482	}	622	}
483	}	623	}
484	#endif	624	#endif
485		625
486	void	626	inline void
487	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
488	{	628	{
489	if (revents & EVENT_READ)	629	if (revents & EV_READ)
490	{	630	{
491	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
492	struct sockaddr_in sa;	632	struct sockaddr_in sa;
493	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
494	int len;	634	int len;
…		…
504	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
505	}	645	}
506	else	646	else
507	{	647	{
508	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
509	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));
510	}	650	}
511		651
512	delete pkt;	652	delete pkt;
513	}	653	}
514	else	654	else
515	{	655	{
516	slog (L_ERR,	656	slog (L_ERR,
517	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
518	revents);	658	revents);
519	exit (EXIT_FAILURE);	659	exit (EXIT_FAILURE);
520	}	660	}
521	}	661	}
522		662
523	void	663	inline void
524	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
525	{	665	{
526	if (revents & EVENT_READ)	666	if (revents & EV_READ)
527	{	667	{
528	/* process data */	668	/* process data */
529	tap_packet *pkt;	669	tap_packet *pkt;
530		670
531	pkt = tap->recv ();	671	pkt = tap->recv ();
…		…
538	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
539	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
540		680
541	if (src != THISNODE->id)	681	if (src != THISNODE->id)
542	{	682	{
543	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."));
544	exit (EXIT_FAILURE);	684	exit (EXIT_FAILURE);
545	}	685	}
546		686
547	if (dst == THISNODE->id)	687	if (dst == THISNODE->id)
548	{	688	{
…		…
560	}	700	}
561	else	701	else
562	abort ();	702	abort ();
563	}	703	}
564		704
565	void	705	inline void
566	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
567	{	707	{
568	if (events)	708	if (events)
569	{	709	{
570	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
571	{	711	{
572	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
573		713
574	shutdown_all ();	714	shutdown_all ();
575	remove_pid (conf.pidfilename);	715	remove_pid (conf.pidfilename);
576	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
577	exit (EXIT_SUCCESS);	717	exit (EXIT_SUCCESS);
578	}	718	}
579		719
580	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
581	{	721	{
582	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
583		723
584	reconnect_all ();	724	reconnect_all ();
585	}	725	}
586		726
587	events = 0;	727	events = 0;
…		…
603		743
604	conns.clear ();	744	conns.clear ();
605		745
606	connection_init ();	746	connection_init ();
607		747
608	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
609	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
610	{	750
611	connection conn = new connection (this, i);	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
612	conns.push_back (conn);
613	conn->establish_connection ();	752	(*c)->establish_connection ();
614	}
615	}	753	}
616		754
617	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
618	{	756	{
619	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	{
620	connection *router = 0;	768	connection *router = 0;
621		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	{
622	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
623	{	826	{
624	connection c = i;	827	connection o = i;
625		828
626	if (c->conf->routerprio > prio	829	if (!o->is_direct
627	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
628	&& c->ictx && c->octx	831	&& c->si != o->si
629	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
630	{
631	prio = c->conf->routerprio;
632	router = c;
633	}	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	}
634	}	838	}
635
636	return router;
637	}	839	}
638		840
639	void vpn::send_connect_request (int id)	841	void vpn::send_connect_request (connection *c)
640	{	842	{
641	connection *c = find_router ();	843	connection *r = find_router_for (c);
642		844
643	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);
644	c->send_connect_request (id);	849	r->send_connect_request (c->conf->id);
		850	}
645	else	851	else
646	// no router found, aggressively connect to all routers	852	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
647	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	853	c->conf->nodename);
648	if ((i)->conf->routerprio && (i)->conf != THISNODE)
649	(*i)->establish_connection ();
650	}	854	}
651		855
652	void	856	void
653	connection::dump_status ()	857	connection::dump_status ()
654	{	858	{
655	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
656	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
657	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
658	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"),
659	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
660	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
661	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
662	}	864	}
663		865
664	void	866	void
665	vpn::dump_status ()	867	vpn::dump_status ()
666	{	868	{
667	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
668		870
669	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
670	(*c)->dump_status ();	872	(*c)->dump_status ();
671		873
672	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
673	}	875	}
674		876
675	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
676	: event (this, &vpn::event_cb)	879	event .set<vpn, &vpn::event_cb > (this);
677	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
678	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
679	#if ENABLE_TCP	882	#if ENABLE_TCP
680	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
681	#endif	884	#endif
682	#if ENABLE_ICMP	885	#if ENABLE_ICMP
683	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
684	#endif	887	#endif
685	#if ENABLE_DNS	888	#if ENABLE_DNS
686	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)	889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
687	#endif	890	#endif
688	, tap_ev_watcher (this, &vpn::tap_ev)	891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
689	{
690	}	892	}
691		893
692	vpn::~vpn ()	894	vpn::~vpn ()
693	{	895	{
694	}	896	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.27 by pcg, Tue Mar 1 06:27:20 2005 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 1.27 by pcg, Tue Mar 1 06:27:20 2005 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC