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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 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) 2003-2008 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/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <errno.h>	43	#include <errno.h>
32	#include <time.h>	44	#include <time.h>
33	#include <unistd.h>	45	#include <unistd.h>
34	#include <fcntl.h>	46	#include <fcntl.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	int success = 0;
		128
		129	ipv4_tos = -1;
78	ipv4_fd = -1;	130	ipv4_fd = -1;
79		131
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	133	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
83		135
84	if (ipv4_fd < 0)	136	if (ipv4_fd < 0)
85	return -1;	137	return -1;
86		138
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
88		141
89	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
91	// 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
92	// fragment for me sometimes.	145	// fragment for me sometimes.
…		…
98		151
99	sockinfo si (THISNODE, PROT_IPv4);	152	sockinfo si (THISNODE, PROT_IPv4);
100		153
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	154	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	155	{
103	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));
104	exit (1);	157	exit (EXIT_FAILURE);
105	}	158	}
106		159
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
108	}	162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
109		165
		166	udpv4_tos = -1;
110	udpv4_fd = -1;	167	udpv4_fd = -1;
111		168
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	170	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		172
116	if (udpv4_fd < 0)	173	if (udpv4_fd < 0)
117	return -1;	174	return -1;
118		175
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
120		178
121	// standard daemon practise...	179	// standard daemon practise...
122	{	180	{
123	int oval = 1;	181	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
136		194
137	sockinfo si (THISNODE, PROT_UDPv4);	195	sockinfo si (THISNODE, PROT_UDPv4);
138		196
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	197	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	198	{
141	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));
142	exit (1);	200	exit (EXIT_FAILURE);
143	}	201	}
144		202
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	203	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		204	++success;
146	}	205	}
		206	else
		207	THISNODE->protocols &= ~PROT_UDPv4;
147		208
		209	icmpv4_tos = -1;
148	icmpv4_fd = -1;	210	icmpv4_fd = -1;
149		211
150	#if ENABLE_ICMP	212	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	213	if (THISNODE->protocols & PROT_ICMPv4)
152	{	214	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	215	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		216
155	if (icmpv4_fd < 0)	217	if (icmpv4_fd < 0)
156	return -1;	218	return -1;
157		219
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	220	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		221	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
159		222
160	#ifdef ICMP_FILTER	223	#ifdef ICMP_FILTER
161	{	224	{
162	icmp_filter oval;	225	icmp_filter oval;
163	oval.data = 0xffffffff;	226	oval.data = 0xffffffff;
…		…
172	// this I really consider a linux bug. I am neither connected	235	// this I really consider a linux bug. I am neither connected
173	// 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
174	// fragment for me sometimes.	237	// fragment for me sometimes.
175	{	238	{
176	int oval = IP_PMTUDISC_DONT;	239	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	240	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	241	}
179	#endif	242	#endif
180		243
181	sockinfo si (THISNODE, PROT_ICMPv4);	244	sockinfo si (THISNODE, PROT_ICMPv4);
182		245
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	246	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	247	{
185	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));
186	exit (1);	249	exit (EXIT_FAILURE);
187	}	250	}
188		251
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
190	}	254	}
191	#endif	255	#endif
192		256
193	tcpv4_fd = -1;	257	tcpv4_fd = -1;
194		258
…		…
199		263
200	if (tcpv4_fd < 0)	264	if (tcpv4_fd < 0)
201	return -1;	265	return -1;
202		266
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
204		269
205	// standard daemon practise...	270	// standard daemon practise...
206	{	271	{
207	int oval = 1;	272	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
210		275
211	sockinfo si (THISNODE, PROT_TCPv4);	276	sockinfo si (THISNODE, PROT_TCPv4);
212		277
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	279	{
215	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));
216	exit (1);	281	exit (EXIT_FAILURE);
217	}	282	}
218		283
219	if (listen (tcpv4_fd, 5))	284	if (listen (tcpv4_fd, 5))
220	{	285	{
221	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));
222	exit (1);	287	exit (EXIT_FAILURE);
		288	}
		289
		290	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		291	++success;
		292	}
		293	else
		294	THISNODE->protocols &= ~PROT_TCPv4;
		295	#endif
		296
		297	dnsv4_tos = -1;
		298	dnsv4_fd = -1;
		299
		300	#if ENABLE_DNS
		301	if (THISNODE->protocols & PROT_DNSv4)
		302	{
		303	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		304
		305	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		306
		307	if (dnsv4_fd < 0)
		308	return -1;
		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);
223	}	320	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#endif	321	# endif
		322
		323	// standard daemon practise...
		324	{
		325	int oval = 1;
		326	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		327	}
		328
		329	sockinfo si (THISNODE->dns_hostname,
		330	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		331	PROT_DNSv4);
		332
		333	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		334	{
		335	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		336	exit (EXIT_FAILURE);
		337	}
		338
		339	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		340	++success;
		341	}
		342	#endif
		343
		344	/////////////////////////////////////////////////////////////////////////////
		345
		346	if (!success)
		347	{
		348	slog (L_ERR, _("no protocols enabled, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
		352	reconnect_all ();
		353
		354	/////////////////////////////////////////////////////////////////////////////
228		355
229	tap = new tap_device ();	356	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
231	{	358	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
233	exit (1);	360	exit (EXIT_FAILURE);
234	}	361	}
235		362
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		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
238	tap_ev_watcher.start (tap->fd, POLLIN);	383	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		384
242	return 0;	385	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	}	386	}
272		387
273	bool	388	bool
274	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)
275	{	390	{
276	#if defined(SOL_IP) && defined(IP_TOS)	391	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 ());	392	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
280		393
281	return true;	394	return true;
282	}	395	}
283		396
…		…
306		419
307	#if ENABLE_ICMP	420	#if ENABLE_ICMP
308	bool	421	bool
309	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)
310	{	423	{
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);	424	pkt->unshift_hdr (4);
316		425
317	icmp_header hdr = (icmp_header )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
318	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
319	hdr->code = 255;	428	hdr->code = 255;
320	hdr->checksum = 0;	429	hdr->checksum = 0;
321	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
322		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
323	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 ());
324		434
325	return true;	435	return true;
326	}	436	}
327	#endif	437	#endif
328		438
329	bool	439	bool
330	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)
331	{	441	{
332	#if defined(SOL_IP) && defined(IP_TOS)	442	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 ());	443	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
336		444
337	return true;	445	return true;
		446	}
		447
		448	void
		449	vpn::inject_data_packet (tap_packet *pkt, int dst)
		450	{
		451	if (dst)
		452	{
		453	// unicast
		454	if (dst != THISNODE->id)
		455	conns[dst - 1]->inject_data_packet (pkt);
		456	}
		457	else
		458	{
		459	// broadcast, this is ugly, but due to the security policy
		460	// we have to connect to all hosts...
		461	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		462	if ((*c)->conf != THISNODE)
		463	(*c)->inject_data_packet (pkt);
		464	}
338	}	465	}
339		466
340	void	467	void
341	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
342	{	469	{
343	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
344	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
345		472
346	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."),
347	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
348		475
349	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
350	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
351	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
352	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)."),
353	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
354	else if (dst > conns.size ())	481	else if (dst > conns.size ())
355	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)."),
356	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
357	else	484	else
358	{	485	{
359	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
360		487
361	if (dst == 0)	488	if (dst == 0)
362	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
363	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
364	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
365	{	492	{
366	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
367	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
368	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
369	else	496	else
370	slog (L_WARN,	497	slog (L_WARN,
371	_("%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?)."),
372	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
373	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
374	}	501	}
375	else	502	else
376	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
377	}	504	}
378	}	505	}
379		506
380	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
381	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
382	{	539	{
383	if (revents & (POLLIN \| POLLERR))	540	if (revents & EV_READ)
384	{	541	{
385	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
386	struct sockaddr_in sa;	543	struct sockaddr_in sa;
387	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
388	int len;	545	int len;
…		…
393		550
394	if (len > 0)	551	if (len > 0)
395	{	552	{
396	pkt->len = len;	553	pkt->len = len;
397		554
398	// 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
399	// this is slow, but...
400	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
401		557
402	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
403	}	559	}
404	else	560	else
405	{	561	{
406	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
407	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
408	}	564	}
409		565
410	delete pkt;	566	delete pkt;
411	}	567	}
412	else if (revents & POLLHUP)
413	{
414	// this cannot ;) happen on udp sockets
415	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
416	exit (1);
417	}
418	else	568	else
419	{	569	{
420	slog (L_ERR,	570	slog (L_ERR,
421	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
422	revents);	572	revents);
423	exit (1);	573	exit (EXIT_FAILURE);
424	}	574	}
425	}	575	}
426		576
427	#if ENABLE_ICMP	577	#if ENABLE_ICMP
428	void	578	inline void
429	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
430	{	580	{
431	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
432	{	582	{
433	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
434	struct sockaddr_in sa;	584	struct sockaddr_in sa;
435	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
436	int len;	586	int len;
…		…
456	}	606	}
457	}	607	}
458	else	608	else
459	{	609	{
460	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
461	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
462	}	612	}
463		613
464	delete pkt;	614	delete pkt;
465	}	615	}
466	else if (revents & POLLHUP)
467	{
468	// this cannot ;) happen on udp sockets
469	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
470	exit (1);
471	}
472	else	616	else
473	{	617	{
474	slog (L_ERR,	618	slog (L_ERR,
475	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
476	revents);	620	revents);
477	exit (1);	621	exit (EXIT_FAILURE);
478	}	622	}
479	}	623	}
480	#endif	624	#endif
481		625
482	void	626	inline void
483	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
484	{	628	{
485	if (revents & (POLLIN \| POLLERR))	629	if (revents & EV_READ)
486	{	630	{
487	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
488	struct sockaddr_in sa;	632	struct sockaddr_in sa;
489	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
490	int len;	634	int len;
…		…
500	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
501	}	645	}
502	else	646	else
503	{	647	{
504	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
505	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));
506	}	650	}
507		651
508	delete pkt;	652	delete pkt;
509	}	653	}
510	else if (revents & POLLHUP)
511	{
512	// this cannot ;) happen on udp sockets
513	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
514	exit (1);
515	}
516	else	654	else
517	{	655	{
518	slog (L_ERR,	656	slog (L_ERR,
519	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
520	revents);	658	revents);
521	exit (1);	659	exit (EXIT_FAILURE);
522	}	660	}
523	}	661	}
524		662
525	void	663	inline void
526	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
527	{	665	{
528	if (revents & POLLIN)	666	if (revents & EV_READ)
529	{	667	{
530	/* process data */	668	/* process data */
531	tap_packet *pkt;	669	tap_packet *pkt;
532		670
533	pkt = tap->recv ();	671	pkt = tap->recv ();
534		672
		673	if (!pkt)
		674	return;
		675
		676	if (pkt->len > 14)
		677	{
535	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
536	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
537		680
538	if (src != THISNODE->id)	681	if (src != THISNODE->id)
539	{
540	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
541	exit (1);
542	}
543
544	if (dst == THISNODE->id)
545	{
546	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
547	exit (1);
548	}
549
550	if (dst > conns.size ())
551	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
552	else
553	{
554	if (dst)
555	{	682	{
556	// unicast	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
557	if (dst != THISNODE->id)	684	exit (EXIT_FAILURE);
558	conns[dst - 1]->inject_data_packet (pkt);
559	}	685	}
		686
		687	if (dst == THISNODE->id)
		688	{
		689	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		690	exit (EXIT_FAILURE);
		691	}
		692
		693	if (dst > conns.size ())
		694	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
560	else	695	else
561	{
562	// broadcast, this is ugly, but due to the security policy
563	// we have to connect to all hosts...
564	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
565	if ((*c)->conf != THISNODE)
566	(*c)->inject_data_packet (pkt);	696	inject_data_packet (pkt, dst);
567	}
568	}	697	}
569		698
570	delete pkt;	699	delete pkt;
571	}	700	}
572	else if (revents & (POLLHUP \| POLLERR))
573	{
574	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
575	exit (1);
576	}
577	else	701	else
578	abort ();	702	abort ();
579	}	703	}
580		704
581	void	705	inline void
582	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
583	{	707	{
584	if (events)	708	if (events)
585	{	709	{
586	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
587	{	711	{
588	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
589		713
590	shutdown_all ();	714	shutdown_all ();
591
592	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
593
594	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
595		717	exit (EXIT_SUCCESS);
596	exit (0);
597	}	718	}
598		719
599	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
600	{	721	{
601	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
602		723
603	reconnect_all ();	724	reconnect_all ();
604	}	725	}
605		726
606	events = 0;	727	events = 0;
607	}	728	}
608
609	w.at = TSTAMP_CANCEL;
610	}	729	}
611		730
612	void	731	void
613	vpn::shutdown_all ()	732	vpn::shutdown_all ()
614	{	733	{
…		…
624		743
625	conns.clear ();	744	conns.clear ();
626		745
627	connection_init ();	746	connection_init ();
628		747
629	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
630	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
631	{
632	connection *conn = new connection (this);
633		750
634	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
635	conns.push_back (conn);
636
637	conn->establish_connection ();	752	(*c)->establish_connection ();
638	}
639	}	753	}
640		754
641	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
642	{	756	{
643	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	{
644	connection *router = 0;	768	connection *router = 0;
645		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	{
646	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
647	{	826	{
648	connection c = i;	827	connection o = i;
649		828
650	if (c->conf->routerprio > prio	829	if (!o->is_direct
651	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
652	&& c->ictx && c->octx	831	&& c->si != o->si
653	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
654	{
655	prio = c->conf->routerprio;
656	router = c;
657	}	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	}
658	}	838	}
659
660	return router;
661	}	839	}
662		840
663	void vpn::send_connect_request (int id)	841	void vpn::send_connect_request (connection *c)
664	{	842	{
665	connection *c = find_router ();	843	connection *r = find_router_for (c);
666		844
667	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);
668	c->send_connect_request (id);	849	r->send_connect_request (c->conf->id);
		850	}
669	else	851	else
670	// no router found, aggressively connect to all routers	852	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
671	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	853	c->conf->nodename);
672	if ((i)->conf->routerprio && (i)->conf != THISNODE)
673	(*i)->establish_connection ();
674	}	854	}
675		855
676	void	856	void
677	connection::dump_status ()	857	connection::dump_status ()
678	{	858	{
679	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
680	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
681	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
682	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"),
683	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
684	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
685	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
686	}	864	}
687		865
688	void	866	void
689	vpn::dump_status ()	867	vpn::dump_status ()
690	{	868	{
691	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
692		870
693	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
694	(*c)->dump_status ();	872	(*c)->dump_status ();
695		873
696	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
697	}	875	}
698		876
699	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
700	: event (this, &vpn::event_cb)	879	event .set<vpn, &vpn::event_cb > (this);
701	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
702	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
703	#if ENABLE_TCP	882	#if ENABLE_TCP
704	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
705	#endif	884	#endif
706	#if ENABLE_ICMP	885	#if ENABLE_ICMP
707	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
708	#endif	887	#endif
709	, tap_ev_watcher (this, &vpn::tap_ev)	888	#if ENABLE_DNS
710	{	889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		890	#endif
		891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
711	}	892	}
712		893
713	vpn::~vpn ()	894	vpn::~vpn ()
714	{	895	{
715	}	896	}

Diff Legend

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

Comparing gvpe/src/vpn.C (file contents): Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs. Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC