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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.16 by pcg, Tue Oct 14 19:59:16 2003 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) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	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
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	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
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	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
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	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.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/wait.h>	42	#include <sys/wait.h>
30	#include <errno.h>	43	#include <errno.h>
39		52
40	#include "connection.h"	53	#include "connection.h"
41	#include "util.h"	54	#include "util.h"
42	#include "vpn.h"	55	#include "vpn.h"
43		56
		57	vpn network; // THE vpn (bad design...)
		58
44	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
45		60
46	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 ()
47	{	75	{
48	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
49	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
50	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		82
55	char *env;	83	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57	putenv (env);
58	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
59	putenv (env);
60	asprintf (&env, "NODEID=%d", THISNODE->id);
61	putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
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 (1);	155	exit (EXIT_FAILURE);
104	}	156	}
105		157
106	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	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 (1);	195	exit (EXIT_FAILURE);
142	}	196	}
143		197
144	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	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 (1);	241	exit (EXIT_FAILURE);
186	}	242	}
187		243
188	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	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 (1);	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 (1);	278	exit (EXIT_FAILURE);
		279	}
		280
		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);
222	}	308	}
223
224	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
225	}
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 (1);	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, POLLIN);	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;
		427	}
		428
		429	void
		430	vpn::inject_data_packet (tap_packet *pkt, int dst)
		431	{
		432	if (dst)
		433	{
		434	// unicast
		435	if (dst != THISNODE->id)
		436	conns[dst - 1]->inject_data_packet (pkt);
		437	}
		438	else
		439	{
		440	// broadcast, this is ugly, but due to the security policy
		441	// we have to connect to all hosts...
		442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		443	if ((*c)->conf != THISNODE)
		444	(*c)->inject_data_packet (pkt);
		445	}
337	}	446	}
338		447
339	void	448	void
340	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
341	{	450	{
342	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
343	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
344		453
345	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."),
346	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
347		456
348	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
349	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
350	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
351	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)."),
352	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
353	else if (dst > conns.size ())	462	else if (dst > conns.size ())
354	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)."),
355	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
356	else	465	else
357	{	466	{
358	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
359		468
360	if (dst == 0)	469	if (dst == 0)
361	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
362	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
363	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
364	{	473	{
365	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
366	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
367	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
368	else	477	else
369	slog (L_WARN,	478	slog (L_WARN,
370	_("%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?)."),
371	c->conf->nodename, (const char *)rsi,	480	c->conf->nodename, (const char *)rsi,
372	conns[dst - 1]->conf->nodename);	481	conns[dst - 1]->conf->nodename);
373	}	482	}
374	else	483	else
375	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
376	}	485	}
377	}	486	}
378		487
379	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
380	vpn::ipv4_ev (io_watcher &w, short revents)	519	vpn::ipv4_ev (ev::io &w, int revents)
381	{	520	{
382	if (revents & (POLLIN \| POLLERR))	521	if (revents & EV_READ)
383	{	522	{
384	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
385	struct sockaddr_in sa;	524	struct sockaddr_in sa;
386	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
387	int len;	526	int len;
…		…
392		531
393	if (len > 0)	532	if (len > 0)
394	{	533	{
395	pkt->len = len;	534	pkt->len = len;
396		535
397	// 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
398	// this is slow, but...
399	pkt->skip_hdr (IP_OVERHEAD);	537	pkt->skip_hdr (IP_OVERHEAD);
400		538
401	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
402	}	540	}
403	else	541	else
404	{	542	{
405	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
406	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
407	}	545	}
408		546
409	delete pkt;	547	delete pkt;
410	}	548	}
411	else if (revents & POLLHUP)
412	{
413	// this cannot ;) happen on udp sockets
414	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
415	exit (1);
416	}
417	else	549	else
418	{	550	{
419	slog (L_ERR,	551	slog (L_ERR,
420	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
421	revents);	553	revents);
422	exit (1);	554	exit (EXIT_FAILURE);
423	}	555	}
424	}	556	}
425		557
426	#if ENABLE_ICMP	558	#if ENABLE_ICMP
427	void	559	inline void
428	vpn::icmpv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
429	{	561	{
430	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
431	{	563	{
432	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
433	struct sockaddr_in sa;	565	struct sockaddr_in sa;
434	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
435	int len;	567	int len;
…		…
455	}	587	}
456	}	588	}
457	else	589	else
458	{	590	{
459	// probably ECONNRESET or somesuch	591	// probably ECONNRESET or somesuch
460	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
461	}	593	}
462		594
463	delete pkt;	595	delete pkt;
464	}	596	}
465	else if (revents & POLLHUP)
466	{
467	// this cannot ;) happen on udp sockets
468	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
469	exit (1);
470	}
471	else	597	else
472	{	598	{
473	slog (L_ERR,	599	slog (L_ERR,
474	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, exiting.\n"),
475	revents);	601	revents);
476	exit (1);	602	exit (EXIT_FAILURE);
477	}	603	}
478	}	604	}
479	#endif	605	#endif
480		606
481	void	607	inline void
482	vpn::udpv4_ev (io_watcher &w, short revents)	608	vpn::udpv4_ev (ev::io &w, int revents)
483	{	609	{
484	if (revents & (POLLIN \| POLLERR))	610	if (revents & EV_READ)
485	{	611	{
486	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
487	struct sockaddr_in sa;	613	struct sockaddr_in sa;
488	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
489	int len;	615	int len;
…		…
499	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
500	}	626	}
501	else	627	else
502	{	628	{
503	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
504	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));
505	}	631	}
506		632
507	delete pkt;	633	delete pkt;
508	}	634	}
509	else if (revents & POLLHUP)
510	{
511	// this cannot ;) happen on udp sockets
512	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
513	exit (1);
514	}
515	else	635	else
516	{	636	{
517	slog (L_ERR,	637	slog (L_ERR,
518	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
519	revents);	639	revents);
520	exit (1);	640	exit (EXIT_FAILURE);
521	}	641	}
522	}	642	}
523		643
524	void	644	inline void
525	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
526	{	646	{
527	if (revents & POLLIN)	647	if (revents & EV_READ)
528	{	648	{
529	/* process data */	649	/* process data */
530	tap_packet *pkt;	650	tap_packet *pkt;
531		651
532	pkt = tap->recv ();	652	pkt = tap->recv ();
533		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
534	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
535	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
536		661
537	if (src != THISNODE->id)	662	if (src != THISNODE->id)
538	{
539	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
540	exit (1);
541	}
542
543	if (dst == THISNODE->id)
544	{
545	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
546	exit (1);
547	}
548
549	if (dst > conns.size ())
550	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
551	else
552	{
553	if (dst)
554	{	663	{
555	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
556	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
557	conns[dst - 1]->inject_data_packet (pkt);
558	}	666	}
		667
		668	if (dst == THISNODE->id)
		669	{
		670	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		671	exit (EXIT_FAILURE);
		672	}
		673
		674	if (dst > conns.size ())
		675	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
559	else	676	else
560	{
561	// broadcast, this is ugly, but due to the security policy
562	// we have to connect to all hosts...
563	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
564	if ((*c)->conf != THISNODE)
565	(*c)->inject_data_packet (pkt);	677	inject_data_packet (pkt, dst);
566	}
567	}	678	}
568		679
569	delete pkt;	680	delete pkt;
570	}
571	else if (revents & (POLLHUP \| POLLERR))
572	{
573	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
574	exit (1);
575	}	681	}
576	else	682	else
577	abort ();	683	abort ();
578	}	684	}
579		685
580	void	686	inline void
581	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
582	{	688	{
583	if (events)	689	if (events)
584	{	690	{
585	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
586	{	692	{
587	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
588		694
589	shutdown_all ();	695	shutdown_all ();
590
591	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
592
593	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
594		698	exit (EXIT_SUCCESS);
595	exit (0);
596	}	699	}
597		700
598	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
599	{	702	{
600	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
601		704
602	reconnect_all ();	705	reconnect_all ();
603	}	706	}
604		707
605	events = 0;	708	events = 0;
606	}	709	}
607
608	w.at = TSTAMP_CANCEL;
609	}	710	}
610		711
611	void	712	void
612	vpn::shutdown_all ()	713	vpn::shutdown_all ()
613	{	714	{
…		…
623		724
624	conns.clear ();	725	conns.clear ();
625		726
626	connection_init ();	727	connection_init ();
627		728
628	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
629	i != conf.nodes.end (); ++i)	730	conns.push_back (new connection (this, *i));
630	{
631	connection *conn = new connection (this);
632		731
633	conn->conf = *i;	732	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
634	conns.push_back (conn);
635
636	conn->establish_connection ();	733	(*c)->establish_connection ();
637	}
638	}	734	}
639		735
640	connection *vpn::find_router ()	736	bool vpn::can_direct (conf_node src, conf_node dst) const
641	{	737	{
642	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	{
643	connection *router = 0;	749	connection *router = 0;
644		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	{
645	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	806	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
646	{	807	{
647	connection c = i;	808	connection o = i;
648		809
649	if (c->conf->routerprio > prio	810	if (!o->is_direct
650	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	811	&& o->si.valid ()
651	&& c->ictx && c->octx	812	&& c->si != o->si
652	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	813	&& c == find_router_for (o))
653	{
654	prio = c->conf->routerprio;
655	router = c;
656	}	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	}
657	}	819	}
658
659	return router;
660	}	820	}
661		821
662	void vpn::send_connect_request (int id)	822	void vpn::send_connect_request (connection *c)
663	{	823	{
664	connection *c = find_router ();	824	connection *r = find_router_for (c);
665		825
666	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);
667	c->send_connect_request (id);	830	r->send_connect_request (c->conf->id);
		831	}
668	else	832	else
669	// no router found, aggressively connect to all routers	833	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
670	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	834	c->conf->nodename);
671	if ((i)->conf->routerprio && (i)->conf != THISNODE)
672	(*i)->establish_connection ();
673	}	835	}
674		836
675	void	837	void
676	connection::dump_status ()	838	connection::dump_status ()
677	{	839	{
678	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	840	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
679	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	841	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
680	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	842	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
681	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"),
682	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	844	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
683	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
684	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
685	}	845	}
686		846
687	void	847	void
688	vpn::dump_status ()	848	vpn::dump_status ()
689	{	849	{
690	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	850	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
691		851
692	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	852	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
693	(*c)->dump_status ();	853	(*c)->dump_status ();
694		854
695	slog (L_NOTICE, _("END status dump"));	855	slog (L_NOTICE, _("END status dump"));
696	}	856	}
697		857
698	vpn::vpn (void)	858	vpn::vpn (void)
		859	{
699	: event (this, &vpn::event_cb)	860	event .set<vpn, &vpn::event_cb > (this);
700	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	861	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
701	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	862	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
702	#if ENABLE_TCP	863	#if ENABLE_TCP
703	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	864	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
704	#endif	865	#endif
705	#if ENABLE_ICMP	866	#if ENABLE_ICMP
706	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	867	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
707	#endif	868	#endif
708	, tap_ev_watcher (this, &vpn::tap_ev)	869	#if ENABLE_DNS
709	{	870	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		871	#endif
		872	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
710	}	873	}
711		874
712	vpn::~vpn ()	875	vpn::~vpn ()
713	{	876	{
714	}	877	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.16 by pcg, Tue Oct 14 19:59:16 2003 UTC vs. Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.16 by pcg, Tue Oct 14 19:59:16 2003 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC