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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.29 by pcg, Fri Mar 4 04:52:38 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) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	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
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	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
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	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
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
46		56
47	vpn network; // THE vpn (bad design...)	57	vpn network; // THE vpn (bad design...)
48		58
49	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
50		60
51	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 ()
52	{	75	{
53	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
54	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
55	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
59		82
60	char *env;	83	char *env;
61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);	87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67	asprintf (&env, "MTU=%d", mtu); putenv (env);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
70	THISNODE->id & 0xff);
71	putenv (env);
72		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,
73	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;
74	}	122	}
75		123
76	int	124	int
77	vpn::setup ()	125	vpn::setup ()
78	{	126	{
		127	int success = 0;
		128
		129	ipv4_tos = -1;
79	ipv4_fd = -1;	130	ipv4_fd = -1;
80		131
81	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
82	{	133	{
83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
84		135
85	if (ipv4_fd < 0)	136	if (ipv4_fd < 0)
86	return -1;	137	return -1;
87		138
88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
89		141
90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
91	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
92	// 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
93	// fragment for me sometimes.	145	// fragment for me sometimes.
…		…
99		151
100	sockinfo si (THISNODE, PROT_IPv4);	152	sockinfo si (THISNODE, PROT_IPv4);
101		153
102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	154	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
103	{	155	{
104	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));
105	exit (EXIT_FAILURE);	157	exit (EXIT_FAILURE);
106	}	158	}
107		159
108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);	160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
109	}	162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
110		165
		166	udpv4_tos = -1;
111	udpv4_fd = -1;	167	udpv4_fd = -1;
112		168
113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
114	{	170	{
115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
116		172
117	if (udpv4_fd < 0)	173	if (udpv4_fd < 0)
118	return -1;	174	return -1;
119		175
120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
121		178
122	// standard daemon practise...	179	// standard daemon practise...
123	{	180	{
124	int oval = 1;	181	int oval = 1;
125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
137		194
138	sockinfo si (THISNODE, PROT_UDPv4);	195	sockinfo si (THISNODE, PROT_UDPv4);
139		196
140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	197	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
141	{	198	{
142	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));
143	exit (EXIT_FAILURE);	200	exit (EXIT_FAILURE);
144	}	201	}
145		202
146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);	203	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		204	++success;
147	}	205	}
		206	else
		207	THISNODE->protocols &= ~PROT_UDPv4;
148		208
		209	icmpv4_tos = -1;
149	icmpv4_fd = -1;	210	icmpv4_fd = -1;
150		211
151	#if ENABLE_ICMP	212	#if ENABLE_ICMP
152	if (THISNODE->protocols & PROT_ICMPv4)	213	if (THISNODE->protocols & PROT_ICMPv4)
153	{	214	{
154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	215	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
155		216
156	if (icmpv4_fd < 0)	217	if (icmpv4_fd < 0)
157	return -1;	218	return -1;
158		219
159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	220	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		221	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
160		222
161	#ifdef ICMP_FILTER	223	#ifdef ICMP_FILTER
162	{	224	{
163	icmp_filter oval;	225	icmp_filter oval;
164	oval.data = 0xffffffff;	226	oval.data = 0xffffffff;
…		…
173	// this I really consider a linux bug. I am neither connected	235	// this I really consider a linux bug. I am neither connected
174	// 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
175	// fragment for me sometimes.	237	// fragment for me sometimes.
176	{	238	{
177	int oval = IP_PMTUDISC_DONT;	239	int oval = IP_PMTUDISC_DONT;
178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	240	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
179	}	241	}
180	#endif	242	#endif
181		243
182	sockinfo si (THISNODE, PROT_ICMPv4);	244	sockinfo si (THISNODE, PROT_ICMPv4);
183		245
184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	246	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
185	{	247	{
186	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));
187	exit (EXIT_FAILURE);	249	exit (EXIT_FAILURE);
188	}	250	}
189		251
190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);	252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
191	}	254	}
192	#endif	255	#endif
193		256
194	tcpv4_fd = -1;	257	tcpv4_fd = -1;
195		258
…		…
200		263
201	if (tcpv4_fd < 0)	264	if (tcpv4_fd < 0)
202	return -1;	265	return -1;
203		266
204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
205		269
206	// standard daemon practise...	270	// standard daemon practise...
207	{	271	{
208	int oval = 1;	272	int oval = 1;
209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
211		275
212	sockinfo si (THISNODE, PROT_TCPv4);	276	sockinfo si (THISNODE, PROT_TCPv4);
213		277
214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
215	{	279	{
216	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));
217	exit (EXIT_FAILURE);	281	exit (EXIT_FAILURE);
218	}	282	}
219		283
220	if (listen (tcpv4_fd, 5))	284	if (listen (tcpv4_fd, 5))
221	{	285	{
222	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));
223	exit (EXIT_FAILURE);	287	exit (EXIT_FAILURE);
224	}	288	}
225		289
226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);	290	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		291	++success;
227	}	292	}
		293	else
		294	THISNODE->protocols &= ~PROT_TCPv4;
228	#endif	295	#endif
		296
		297	dnsv4_tos = -1;
		298	dnsv4_fd = -1;
229		299
230	#if ENABLE_DNS	300	#if ENABLE_DNS
231	if (THISNODE->protocols & PROT_DNSv4)	301	if (THISNODE->protocols & PROT_DNSv4)
232	{	302	{
233	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);	303	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
…		…
235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	305	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
236		306
237	if (dnsv4_fd < 0)	307	if (dnsv4_fd < 0)
238	return -1;	308	return -1;
239		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
240	// standard daemon practise...	323	// standard daemon practise...
241	{	324	{
242	int oval = 1;	325	int oval = 1;
243	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	326	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
244	}	327	}
245		328
246	sockinfo si (THISNODE, PROT_DNSv4);	329	sockinfo si (THISNODE->dns_hostname,
		330	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		331	PROT_DNSv4);
247		332
248	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))	333	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
249	{	334	{
250	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));
251	exit (EXIT_FAILURE);	336	exit (EXIT_FAILURE);
252	}	337	}
253		338
254	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)
255	}	347	{
256	#endif	348	slog (L_ERR, _("no protocols enabled, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
		352	reconnect_all ();
		353
		354	/////////////////////////////////////////////////////////////////////////////
257		355
258	tap = new tap_device ();	356	tap = new tap_device ();
259	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
260	{	358	{
261	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
262	exit (EXIT_FAILURE);	360	exit (EXIT_FAILURE);
263	}	361	}
264		362
265	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
266		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
267	tap_ev_watcher.start (tap->fd, EVENT_READ);	383	tap_ev_watcher.start (tap->fd, EV_READ);
268
269	reconnect_all ();
270		384
271	return 0;	385	return 0;
272	}	386	}
273		387
274	bool	388	bool
275	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)
276	{	390	{
277	#if defined(SOL_IP) && defined(IP_TOS)	391	set_tos (ipv4_fd, ipv4_tos, tos);
278	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
279	#endif
280	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 ());
281		393
282	return true;	394	return true;
283	}	395	}
284		396
…		…
307		419
308	#if ENABLE_ICMP	420	#if ENABLE_ICMP
309	bool	421	bool
310	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)
311	{	423	{
312	#if defined(SOL_IP) && defined(IP_TOS)
313	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
314	#endif
315
316	pkt->unshift_hdr (4);	424	pkt->unshift_hdr (4);
317		425
318	icmp_header hdr = (icmp_header )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
319	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
320	hdr->code = 255;	428	hdr->code = 255;
321	hdr->checksum = 0;	429	hdr->checksum = 0;
322	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
323		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
324	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 ());
325		434
326	return true;	435	return true;
327	}	436	}
328	#endif	437	#endif
329		438
330	bool	439	bool
331	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)
332	{	441	{
333	#if defined(SOL_IP) && defined(IP_TOS)	442	set_tos (udpv4_fd, udpv4_tos, tos);
334	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
335	#endif
336	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 ());
337		444
338	return true;	445	return true;
339	}	446	}
340		447
…		…
351	{	458	{
352	// broadcast, this is ugly, but due to the security policy	459	// broadcast, this is ugly, but due to the security policy
353	// we have to connect to all hosts...	460	// we have to connect to all hosts...
354	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	461	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
355	if ((*c)->conf != THISNODE)	462	if ((*c)->conf != THISNODE)
356	(*c)->inject_data_packet (pkt, true);	463	(*c)->inject_data_packet (pkt);
357	}	464	}
358	}	465	}
359		466
360	void	467	void
361	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
362	{	469	{
363	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
364	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
365		472
366	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."),
367	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
368		475
369	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
370	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
371	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
372	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)."),
373	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
374	else if (dst > conns.size ())	481	else if (dst > conns.size ())
375	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)."),
376	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
377	else	484	else
378	{	485	{
379	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
380		487
381	if (dst == 0)	488	if (dst == 0)
382	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
383	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
384	else if (dst != THISNODE->id)	491	else if (dst != THISNODE->id)
385	{	492	{
386	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
387	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
388	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
389	else	496	else
390	slog (L_WARN,	497	slog (L_WARN,
391	_("%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?)."),
392	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
393	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
394	}	501	}
395	else	502	else
396	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
397	}	504	}
398	}	505	}
399		506
400	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
401	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
402	{	539	{
403	if (revents & EVENT_READ)	540	if (revents & EV_READ)
404	{	541	{
405	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
406	struct sockaddr_in sa;	543	struct sockaddr_in sa;
407	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
408	int len;	545	int len;
…		…
413		550
414	if (len > 0)	551	if (len > 0)
415	{	552	{
416	pkt->len = len;	553	pkt->len = len;
417		554
418	// 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
419	// this is slow, but...
420	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
421		557
422	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
423	}	559	}
424	else	560	else
425	{	561	{
426	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
427	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
428	}	564	}
429		565
430	delete pkt;	566	delete pkt;
431	}	567	}
432	else	568	else
433	{	569	{
434	slog (L_ERR,	570	slog (L_ERR,
435	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
436	revents);	572	revents);
437	exit (EXIT_FAILURE);	573	exit (EXIT_FAILURE);
438	}	574	}
439	}	575	}
440		576
441	#if ENABLE_ICMP	577	#if ENABLE_ICMP
442	void	578	inline void
443	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
444	{	580	{
445	if (revents & EVENT_READ)	581	if (revents & EV_READ)
446	{	582	{
447	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
448	struct sockaddr_in sa;	584	struct sockaddr_in sa;
449	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
450	int len;	586	int len;
…		…
470	}	606	}
471	}	607	}
472	else	608	else
473	{	609	{
474	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
475	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
476	}	612	}
477		613
478	delete pkt;	614	delete pkt;
479	}	615	}
480	else	616	else
481	{	617	{
482	slog (L_ERR,	618	slog (L_ERR,
483	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
484	revents);	620	revents);
485	exit (EXIT_FAILURE);	621	exit (EXIT_FAILURE);
486	}	622	}
487	}	623	}
488	#endif	624	#endif
489		625
490	void	626	inline void
491	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
492	{	628	{
493	if (revents & EVENT_READ)	629	if (revents & EV_READ)
494	{	630	{
495	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
496	struct sockaddr_in sa;	632	struct sockaddr_in sa;
497	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
498	int len;	634	int len;
…		…
508	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
509	}	645	}
510	else	646	else
511	{	647	{
512	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
513	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));
514	}	650	}
515		651
516	delete pkt;	652	delete pkt;
517	}	653	}
518	else	654	else
519	{	655	{
520	slog (L_ERR,	656	slog (L_ERR,
521	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
522	revents);	658	revents);
523	exit (EXIT_FAILURE);	659	exit (EXIT_FAILURE);
524	}	660	}
525	}	661	}
526		662
527	void	663	inline void
528	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
529	{	665	{
530	if (revents & EVENT_READ)	666	if (revents & EV_READ)
531	{	667	{
532	/* process data */	668	/* process data */
533	tap_packet *pkt;	669	tap_packet *pkt;
534		670
535	pkt = tap->recv ();	671	pkt = tap->recv ();
…		…
542	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
543	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
544		680
545	if (src != THISNODE->id)	681	if (src != THISNODE->id)
546	{	682	{
547	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."));
548	exit (EXIT_FAILURE);	684	exit (EXIT_FAILURE);
549	}	685	}
550		686
551	if (dst == THISNODE->id)	687	if (dst == THISNODE->id)
552	{	688	{
…		…
564	}	700	}
565	else	701	else
566	abort ();	702	abort ();
567	}	703	}
568		704
569	void	705	inline void
570	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
571	{	707	{
572	if (events)	708	if (events)
573	{	709	{
574	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
575	{	711	{
576	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
577		713
578	shutdown_all ();	714	shutdown_all ();
579	remove_pid (conf.pidfilename);	715	remove_pid (conf.pidfilename);
580	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
581	exit (EXIT_SUCCESS);	717	exit (EXIT_SUCCESS);
582	}	718	}
583		719
584	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
585	{	721	{
586	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
587		723
588	reconnect_all ();	724	reconnect_all ();
589	}	725	}
590		726
591	events = 0;	727	events = 0;
…		…
607		743
608	conns.clear ();	744	conns.clear ();
609		745
610	connection_init ();	746	connection_init ();
611		747
612	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
613	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
614	{	750
615	connection conn = new connection (this, i);	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
616	conns.push_back (conn);
617	conn->establish_connection ();	752	(*c)->establish_connection ();
618	}
619	}	753	}
620		754
621	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
622	{	756	{
623	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	{
624	connection *router = 0;	768	connection *router = 0;
625		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	{
626	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
627	{	826	{
628	connection c = i;	827	connection o = i;
629		828
630	if (c->conf->routerprio > prio	829	if (!o->is_direct
631	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
632	&& c->ictx && c->octx	831	&& c->si != o->si
633	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
634	{
635	prio = c->conf->routerprio;
636	router = c;
637	}	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	}
638	}	838	}
639
640	return router;
641	}	839	}
642		840
643	void vpn::send_connect_request (int id)	841	void vpn::send_connect_request (connection *c)
644	{	842	{
645	connection *c = find_router ();	843	connection *r = find_router_for (c);
646		844
647	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);
648	c->send_connect_request (id);	849	r->send_connect_request (c->conf->id);
		850	}
649	else	851	else
650	// no router found, aggressively connect to all routers	852	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
651	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	853	c->conf->nodename);
652	if ((i)->conf->routerprio && (i)->conf != THISNODE)
653	(*i)->establish_connection ();
654	}	854	}
655		855
656	void	856	void
657	connection::dump_status ()	857	connection::dump_status ()
658	{	858	{
659	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
660	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
661	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
662	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"),
663	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
664	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
665	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
666	}	864	}
667		865
668	void	866	void
669	vpn::dump_status ()	867	vpn::dump_status ()
670	{	868	{
671	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
672		870
673	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
674	(*c)->dump_status ();	872	(*c)->dump_status ();
675		873
676	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
677	}	875	}
678		876
679	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
680	: event (this, &vpn::event_cb)	879	event .set<vpn, &vpn::event_cb > (this);
681	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
682	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
683	#if ENABLE_TCP	882	#if ENABLE_TCP
684	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
685	#endif	884	#endif
686	#if ENABLE_ICMP	885	#if ENABLE_ICMP
687	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
688	#endif	887	#endif
689	#if ENABLE_DNS	888	#if ENABLE_DNS
690	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)	889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
691	#endif	890	#endif
692	, tap_ev_watcher (this, &vpn::tap_ev)	891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
693	{
694	}	892	}
695		893
696	vpn::~vpn ()	894	vpn::~vpn ()
697	{	895	{
698	}	896	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.29 by pcg, Fri Mar 4 04:52:38 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 1.29 by pcg, Fri Mar 4 04:52:38 2005 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC