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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 UTC vs.
Revision 1.49 by pcg, Sun Aug 10 01:34:36 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 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>
23		35
		36	#include <cstdio>
		37	#include <cstring>
24	#include <cstdlib>	38	#include <cstdlib>
25	#include <cstring>
26	#include <cstdio>
27		39
28	#include <sys/types.h>	40	#include <sys/types.h>
29	#include <sys/socket.h>	41	#include <sys/socket.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <errno.h>	43	#include <errno.h>
40		52
41	#include "connection.h"	53	#include "connection.h"
42	#include "util.h"	54	#include "util.h"
43	#include "vpn.h"	55	#include "vpn.h"
44		56
		57	vpn network; // THE vpn (bad design...)
		58
45	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
46		60
47	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 ()
48	{	75	{
49	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
50	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
51	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
52	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55		82
56	char *env;	83	char *env;
57	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
60	putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id);
62	putenv (env);
63	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69	THISNODE->id & 0xff);
70	putenv (env);
71		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,
72	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;
73	}	122	}
74		123
75	int	124	int
76	vpn::setup ()	125	vpn::setup ()
77	{	126	{
		127	ipv4_tos = -1;
78	ipv4_fd = -1;	128	ipv4_fd = -1;
79		129
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	131	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
83		133
84	if (ipv4_fd < 0)	134	if (ipv4_fd < 0)
85	return -1;	135	return -1;
86		136
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
88		139
89	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
91	// 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
92	// fragment for me sometimes.	143	// fragment for me sometimes.
…		…
98		149
99	sockinfo si (THISNODE, PROT_IPv4);	150	sockinfo si (THISNODE, PROT_IPv4);
100		151
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	153	{
103	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));
104	exit (1);	155	exit (EXIT_FAILURE);
105	}	156	}
106		157
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
108	}	159	}
109		160
		161	udpv4_tos = -1;
110	udpv4_fd = -1;	162	udpv4_fd = -1;
111		163
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	165	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		167
116	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
117	return -1;	169	return -1;
118		170
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
120		173
121	// standard daemon practise...	174	// standard daemon practise...
122	{	175	{
123	int oval = 1;	176	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
136		189
137	sockinfo si (THISNODE, PROT_UDPv4);	190	sockinfo si (THISNODE, PROT_UDPv4);
138		191
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	193	{
141	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));
142	exit (1);	195	exit (EXIT_FAILURE);
143	}	196	}
144		197
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
146	}	199	}
147		200
		201	icmpv4_tos = -1;
148	icmpv4_fd = -1;	202	icmpv4_fd = -1;
149		203
150	#if ENABLE_ICMP	204	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	205	if (THISNODE->protocols & PROT_ICMPv4)
152	{	206	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		208
155	if (icmpv4_fd < 0)	209	if (icmpv4_fd < 0)
156	return -1;	210	return -1;
157		211
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
159		214
160	#ifdef ICMP_FILTER	215	#ifdef ICMP_FILTER
161	{	216	{
162	icmp_filter oval;	217	icmp_filter oval;
163	oval.data = 0xffffffff;	218	oval.data = 0xffffffff;
…		…
172	// this I really consider a linux bug. I am neither connected	227	// this I really consider a linux bug. I am neither connected
173	// 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
174	// fragment for me sometimes.	229	// fragment for me sometimes.
175	{	230	{
176	int oval = IP_PMTUDISC_DONT;	231	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	233	}
179	#endif	234	#endif
180		235
181	sockinfo si (THISNODE, PROT_ICMPv4);	236	sockinfo si (THISNODE, PROT_ICMPv4);
182		237
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	239	{
185	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));
186	exit (1);	241	exit (EXIT_FAILURE);
187	}	242	}
188		243
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
190	}	245	}
191	#endif	246	#endif
192		247
193	tcpv4_fd = -1;	248	tcpv4_fd = -1;
194		249
…		…
199		254
200	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
201	return -1;	256	return -1;
202		257
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
204		260
205	// standard daemon practise...	261	// standard daemon practise...
206	{	262	{
207	int oval = 1;	263	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
210		266
211	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
212		268
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	270	{
215	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));
216	exit (1);	272	exit (EXIT_FAILURE);
217	}	273	}
218		274
219	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
220	{	276	{
221	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));
222	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);
223	}	308	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#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	/////////////////////////////////////////////////////////////////////////////
228		336
229	tap = new tap_device ();	337	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
231	{	339	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
233	exit (1);	341	exit (EXIT_FAILURE);
234	}	342	}
235		343
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		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
238	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		365
242	return 0;	366	return 0;
243	}
244
245	// send a vpn packet out to other hosts
246	bool
247	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
248	{
249	switch (si.prot)
250	{
251	case PROT_IPv4:
252	return send_ipv4_packet (pkt, si, tos);
253
254	case PROT_UDPv4:
255	return send_udpv4_packet (pkt, si, tos);
256
257	#if ENABLE_TCP
258	case PROT_TCPv4:
259	return send_tcpv4_packet (pkt, si, tos);
260	#endif
261
262	#if ENABLE_ICMP
263	case PROT_ICMPv4:
264	return send_icmpv4_packet (pkt, si, tos);
265	#endif
266
267	default:
268	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
269	return false;
270	}
271	}	367	}
272		368
273	bool	369	bool
274	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)
275	{	371	{
276	#if defined(SOL_IP) && defined(IP_TOS)	372	set_tos (ipv4_fd, ipv4_tos, tos);
277	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
278	#endif
279	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 ());
280		374
281	return true;	375	return true;
282	}	376	}
283		377
…		…
306		400
307	#if ENABLE_ICMP	401	#if ENABLE_ICMP
308	bool	402	bool
309	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)
310	{	404	{
311	#if defined(SOL_IP) && defined(IP_TOS)
312	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
313	#endif
314
315	pkt->unshift_hdr (4);	405	pkt->unshift_hdr (4);
316		406
317	icmp_header hdr = (icmp_header )&((*pkt)[0]);	407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
318	hdr->type = ::conf.icmp_type;	408	hdr->type = ::conf.icmp_type;
319	hdr->code = 255;	409	hdr->code = 255;
320	hdr->checksum = 0;	410	hdr->checksum = 0;
321	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
322		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
323	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 ());
324		415
325	return true;	416	return true;
326	}	417	}
327	#endif	418	#endif
328		419
329	bool	420	bool
330	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)
331	{	422	{
332	#if defined(SOL_IP) && defined(IP_TOS)	423	set_tos (udpv4_fd, udpv4_tos, tos);
333	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334	#endif
335	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 ());
336		425
337	return true;	426	return true;
338	}	427	}
339		428
…		…
350	{	439	{
351	// broadcast, this is ugly, but due to the security policy	440	// broadcast, this is ugly, but due to the security policy
352	// we have to connect to all hosts...	441	// we have to connect to all hosts...
353	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
354	if ((*c)->conf != THISNODE)	443	if ((*c)->conf != THISNODE)
355	(*c)->inject_data_packet (pkt, true);	444	(*c)->inject_data_packet (pkt);
356	}	445	}
357	}	446	}
358		447
359	void	448	void
360	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
361	{	450	{
362	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
363	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
364		453
365	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."),
366	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
367		456
368	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
369	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
370	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
371	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)."),
372	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
373	else if (dst > conns.size ())	462	else if (dst > conns.size ())
374	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)."),
375	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
376	else	465	else
377	{	466	{
378	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
379		468
380	if (dst == 0)	469	if (dst == 0)
381	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
382	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
383	else if (dst != THISNODE->id)	472	else if (dst != THISNODE->id)
384	{	473	{
385	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
386	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
387	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
388	else	477	else
389	slog (L_WARN,	478	slog (L_WARN,
390	_("%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?)."),
391	c->conf->nodename, (const char *)rsi,	480	c->conf->nodename, (const char *)rsi,
392	conns[dst - 1]->conf->nodename);	481	conns[dst - 1]->conf->nodename);
393	}	482	}
394	else	483	else
395	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
396	}	485	}
397	}	486	}
398		487
399	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
400	vpn::ipv4_ev (io_watcher &w, short revents)	519	vpn::ipv4_ev (ev::io &w, int revents)
401	{	520	{
402	if (revents & (POLLIN \| POLLERR))	521	if (revents & EV_READ)
403	{	522	{
404	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
405	struct sockaddr_in sa;	524	struct sockaddr_in sa;
406	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
407	int len;	526	int len;
…		…
412		531
413	if (len > 0)	532	if (len > 0)
414	{	533	{
415	pkt->len = len;	534	pkt->len = len;
416		535
417	// 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
418	// this is slow, but...
419	pkt->skip_hdr (IP_OVERHEAD);	537	pkt->skip_hdr (IP_OVERHEAD);
420		538
421	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
422	}	540	}
423	else	541	else
424	{	542	{
425	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
426	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
427	}	545	}
428		546
429	delete pkt;	547	delete pkt;
430	}	548	}
431	else if (revents & POLLHUP)
432	{
433	// this cannot ;) happen on udp sockets
434	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
435	exit (1);
436	}
437	else	549	else
438	{	550	{
439	slog (L_ERR,	551	slog (L_ERR,
440	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
441	revents);	553	revents);
442	exit (1);	554	exit (EXIT_FAILURE);
443	}	555	}
444	}	556	}
445		557
446	#if ENABLE_ICMP	558	#if ENABLE_ICMP
447	void	559	inline void
448	vpn::icmpv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
449	{	561	{
450	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
451	{	563	{
452	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
453	struct sockaddr_in sa;	565	struct sockaddr_in sa;
454	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
455	int len;	567	int len;
…		…
475	}	587	}
476	}	588	}
477	else	589	else
478	{	590	{
479	// probably ECONNRESET or somesuch	591	// probably ECONNRESET or somesuch
480	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
481	}	593	}
482		594
483	delete pkt;	595	delete pkt;
484	}	596	}
485	else if (revents & POLLHUP)
486	{
487	// this cannot ;) happen on udp sockets
488	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
489	exit (1);
490	}
491	else	597	else
492	{	598	{
493	slog (L_ERR,	599	slog (L_ERR,
494	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, exiting.\n"),
495	revents);	601	revents);
496	exit (1);	602	exit (EXIT_FAILURE);
497	}	603	}
498	}	604	}
499	#endif	605	#endif
500		606
501	void	607	inline void
502	vpn::udpv4_ev (io_watcher &w, short revents)	608	vpn::udpv4_ev (ev::io &w, int revents)
503	{	609	{
504	if (revents & (POLLIN \| POLLERR))	610	if (revents & EV_READ)
505	{	611	{
506	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
507	struct sockaddr_in sa;	613	struct sockaddr_in sa;
508	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
509	int len;	615	int len;
…		…
519	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
520	}	626	}
521	else	627	else
522	{	628	{
523	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
524	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));
525	}	631	}
526		632
527	delete pkt;	633	delete pkt;
528	}	634	}
529	else if (revents & POLLHUP)
530	{
531	// this cannot ;) happen on udp sockets
532	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
533	exit (1);
534	}
535	else	635	else
536	{	636	{
537	slog (L_ERR,	637	slog (L_ERR,
538	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
539	revents);	639	revents);
540	exit (1);	640	exit (EXIT_FAILURE);
541	}	641	}
542	}	642	}
543		643
544	void	644	inline void
545	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
546	{	646	{
547	if (revents & POLLIN)	647	if (revents & EV_READ)
548	{	648	{
549	/* process data */	649	/* process data */
550	tap_packet *pkt;	650	tap_packet *pkt;
551		651
552	pkt = tap->recv ();	652	pkt = tap->recv ();
…		…
559	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
560	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
561		661
562	if (src != THISNODE->id)	662	if (src != THISNODE->id)
563	{	663	{
564	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
565	exit (1);	665	exit (EXIT_FAILURE);
566	}	666	}
567		667
568	if (dst == THISNODE->id)	668	if (dst == THISNODE->id)
569	{	669	{
570	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	670	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
571	exit (1);	671	exit (EXIT_FAILURE);
572	}	672	}
573		673
574	if (dst > conns.size ())	674	if (dst > conns.size ())
575	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	675	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
576	else	676	else
577	inject_data_packet (pkt, dst);	677	inject_data_packet (pkt, dst);
578	}	678	}
579		679
580	delete pkt;	680	delete pkt;
581	}	681	}
582	else if (revents & (POLLHUP \| POLLERR))
583	{
584	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
585	exit (1);
586	}
587	else	682	else
588	abort ();	683	abort ();
589	}	684	}
590		685
591	void	686	inline void
592	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
593	{	688	{
594	if (events)	689	if (events)
595	{	690	{
596	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
597	{	692	{
598	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
599		694
600	shutdown_all ();	695	shutdown_all ();
601
602	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
603
604	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
605		698	exit (EXIT_SUCCESS);
606	exit (0);
607	}	699	}
608		700
609	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
610	{	702	{
611	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
612		704
613	reconnect_all ();	705	reconnect_all ();
614	}	706	}
615		707
616	events = 0;	708	events = 0;
617	}	709	}
618
619	w.at = TSTAMP_CANCEL;
620	}	710	}
621		711
622	void	712	void
623	vpn::shutdown_all ()	713	vpn::shutdown_all ()
624	{	714	{
…		…
637	connection_init ();	727	connection_init ();
638		728
639	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin ();
640	i != conf.nodes.end (); ++i)	730	i != conf.nodes.end (); ++i)
641	{	731	{
642	connection *conn = new connection (this);	732	connection conn = new connection (this, i);
643
644	conn->conf = *i;
645	conns.push_back (conn);	733	conns.push_back (conn);
646
647	conn->establish_connection ();	734	conn->establish_connection ();
648	}	735	}
649	}	736	}
650		737
651	connection *vpn::find_router ()	738	bool vpn::can_direct (conf_node src, conf_node dst) const
652	{	739	{
653	u32 prio = 1;	740	return src != dst
		741	&& src->may_direct (dst)
		742	&& dst->may_direct (src)
		743	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		744	\|\| (src->protocols & dst->connectable_protocols ()));
		745	}
		746
		747	// only works for indirect and routed connections: find a router
		748	// from THISNODE to dst
		749	connection vpn::find_router_for (const connection dst)
		750	{
654	connection *router = 0;	751	connection *router = 0;
655		752
		753	// first try to find a router with a direct connection
		754	{
		755	u32 prio = 1;
		756
		757	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		758	{
		759	connection c = i;
		760
		761	if (c->conf->routerprio > prio
		762	&& c->conf != THISNODE
		763	&& c != dst
		764	&& can_direct (c->conf, dst->conf))
		765	{
		766	if (c->ictx && c->octx)
		767	{
		768	prio = c->conf->routerprio;
		769	router = c;
		770	}
		771	else
		772	c->establish_connection ();
		773	}
		774	}
		775	}
		776
		777	if (router)
		778	return router;
		779
		780	// second try find the router with the highest priority higher than ours
		781	{
		782	u32 prio = 1;
		783
		784	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		785	{
		786	connection c = i;
		787
		788	if (c->conf->routerprio > prio
		789	&& c->conf->routerprio > THISNODE->routerprio
		790	&& c != dst
		791	&& c->conf != THISNODE)
		792	{
		793	if (c->ictx && c->octx)
		794	{
		795	prio = c->conf->routerprio;
		796	router = c;
		797	}
		798	else
		799	c->establish_connection ();
		800	}
		801	}
		802	}
		803	return router;
		804	}
		805
		806	void vpn::connection_established (connection *c)
		807	{
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	808	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	{	809	{
658	connection c = i;	810	connection o = i;
659		811
660	if (c->conf->routerprio > prio	812	if (!o->is_direct
661	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	813	&& o->si.valid ()
662	&& c->ictx && c->octx	814	&& c->si != o->si
663	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	815	&& c == find_router_for (o))
664	{
665	prio = c->conf->routerprio;
666	router = c;
667	}	816	{
		817	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		818	o->conf->nodename, c->conf->nodename);
		819	o->rekey ();
		820	}
668	}	821	}
669
670	return router;
671	}	822	}
672		823
673	void vpn::send_connect_request (int id)	824	void vpn::send_connect_request (int id)
674	{	825	{
675	connection *c = find_router ();	826	connection *c = find_router_for (conns[id]);
676		827
677	if (c)	828	if (c)
		829	{
		830	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		831	conns[id]->conf->nodename, c->conf->nodename);
678	c->send_connect_request (id);	832	c->send_connect_request (id);
		833	}
679	else	834	else
680	// no router found, aggressively connect to all routers	835	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), conns[id]->conf->nodename);
681	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
682	if ((i)->conf->routerprio && (i)->conf != THISNODE)
683	(*i)->establish_connection ();
684	}	836	}
685		837
686	void	838	void
687	connection::dump_status ()	839	connection::dump_status ()
688	{	840	{
689	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	841	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
690	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	842	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
691	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	843	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
692	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	844	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
693	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	845	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
694	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
695	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
696	}	846	}
697		847
698	void	848	void
699	vpn::dump_status ()	849	vpn::dump_status ()
700	{	850	{
701	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	851	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
702		852
703	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	853	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
704	(*c)->dump_status ();	854	(*c)->dump_status ();
705		855
706	slog (L_NOTICE, _("END status dump"));	856	slog (L_NOTICE, _("END status dump"));
707	}	857	}
708		858
709	vpn::vpn (void)	859	vpn::vpn (void)
		860	{
710	: event (this, &vpn::event_cb)	861	event .set<vpn, &vpn::event_cb > (this);
711	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	862	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
712	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	863	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
713	#if ENABLE_TCP	864	#if ENABLE_TCP
714	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	865	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
715	#endif	866	#endif
716	#if ENABLE_ICMP	867	#if ENABLE_ICMP
717	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	868	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
718	#endif	869	#endif
719	, tap_ev_watcher (this, &vpn::tap_ev)	870	#if ENABLE_DNS
720	{	871	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		872	#endif
		873	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
721	}	874	}
722		875
723	vpn::~vpn ()	876	vpn::~vpn ()
724	{	877	{
725	}	878	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 UTC vs. Revision 1.49 by pcg, Sun Aug 10 01:34:36 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 UTC vs.
Revision 1.49 by pcg, Sun Aug 10 01:34:36 2008 UTC