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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.17 by pcg, Wed Oct 15 06:06:41 2003 UTC vs.
Revision 1.52 by pcg, Sun Aug 10 22:18:58 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	int success = 0;
		128
		129	ipv4_tos = -1;
77	ipv4_fd = -1;	130	ipv4_fd = -1;
78		131
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	133	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		135
83	if (ipv4_fd < 0)	136	if (ipv4_fd < 0)
84	return -1;	137	return -1;
85		138
86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
87		141
88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
90	// nor do I fragment myself. Linux still sets DF and doesn't	144	// nor do I fragment myself. Linux still sets DF and doesn't
91	// fragment for me sometimes.	145	// fragment for me sometimes.
…		…
97		151
98	sockinfo si (THISNODE, PROT_IPv4);	152	sockinfo si (THISNODE, PROT_IPv4);
99		153
100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	154	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101	{	155	{
102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	156	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
103	exit (1);	157	exit (EXIT_FAILURE);
104	}	158	}
105		159
106	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
107	}	162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
108		165
		166	udpv4_tos = -1;
109	udpv4_fd = -1;	167	udpv4_fd = -1;
110		168
111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112	{	170	{
113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114		172
115	if (udpv4_fd < 0)	173	if (udpv4_fd < 0)
116	return -1;	174	return -1;
117		175
118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
119		178
120	// standard daemon practise...	179	// standard daemon practise...
121	{	180	{
122	int oval = 1;	181	int oval = 1;
123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
135		194
136	sockinfo si (THISNODE, PROT_UDPv4);	195	sockinfo si (THISNODE, PROT_UDPv4);
137		196
138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	197	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139	{	198	{
140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	199	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
141	exit (1);	200	exit (EXIT_FAILURE);
142	}	201	}
143		202
144	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	203	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		204	++success;
145	}	205	}
		206	else
		207	THISNODE->protocols &= ~PROT_UDPv4;
146		208
		209	icmpv4_tos = -1;
147	icmpv4_fd = -1;	210	icmpv4_fd = -1;
148		211
149	#if ENABLE_ICMP	212	#if ENABLE_ICMP
150	if (THISNODE->protocols & PROT_ICMPv4)	213	if (THISNODE->protocols & PROT_ICMPv4)
151	{	214	{
152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	215	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
153		216
154	if (icmpv4_fd < 0)	217	if (icmpv4_fd < 0)
155	return -1;	218	return -1;
156		219
157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	220	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		221	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
158		222
159	#ifdef ICMP_FILTER	223	#ifdef ICMP_FILTER
160	{	224	{
161	icmp_filter oval;	225	icmp_filter oval;
162	oval.data = 0xffffffff;	226	oval.data = 0xffffffff;
…		…
171	// this I really consider a linux bug. I am neither connected	235	// this I really consider a linux bug. I am neither connected
172	// nor do I fragment myself. Linux still sets DF and doesn't	236	// nor do I fragment myself. Linux still sets DF and doesn't
173	// fragment for me sometimes.	237	// fragment for me sometimes.
174	{	238	{
175	int oval = IP_PMTUDISC_DONT;	239	int oval = IP_PMTUDISC_DONT;
176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	240	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	241	}
178	#endif	242	#endif
179		243
180	sockinfo si (THISNODE, PROT_ICMPv4);	244	sockinfo si (THISNODE, PROT_ICMPv4);
181		245
182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	246	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183	{	247	{
184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	248	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
185	exit (1);	249	exit (EXIT_FAILURE);
186	}	250	}
187		251
188	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
189	}	254	}
190	#endif	255	#endif
191		256
192	tcpv4_fd = -1;	257	tcpv4_fd = -1;
193		258
…		…
198		263
199	if (tcpv4_fd < 0)	264	if (tcpv4_fd < 0)
200	return -1;	265	return -1;
201		266
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
203		269
204	// standard daemon practise...	270	// standard daemon practise...
205	{	271	{
206	int oval = 1;	272	int oval = 1;
207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
209		275
210	sockinfo si (THISNODE, PROT_TCPv4);	276	sockinfo si (THISNODE, PROT_TCPv4);
211		277
212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213	{	279	{
214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	280	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
215	exit (1);	281	exit (EXIT_FAILURE);
216	}	282	}
217		283
218	if (listen (tcpv4_fd, 5))	284	if (listen (tcpv4_fd, 5))
219	{	285	{
220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	286	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
221	exit (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);
222	}	320	}
223
224	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
225	}
226	#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	/////////////////////////////////////////////////////////////////////////////
227		355
228	tap = new tap_device ();	356	tap = new tap_device ();
229	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
230	{	358	{
231	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
232	exit (1);	360	exit (EXIT_FAILURE);
233	}	361	}
234		362
235	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
236		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
237	tap_ev_watcher.start (tap->fd, POLLIN);	383	tap_ev_watcher.start (tap->fd, EV_READ);
238
239	reconnect_all ();
240		384
241	return 0;	385	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	}	386	}
271		387
272	bool	388	bool
273	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)
274	{	390	{
275	#if defined(SOL_IP) && defined(IP_TOS)	391	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 ());	392	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
279		393
280	return true;	394	return true;
281	}	395	}
282		396
…		…
305		419
306	#if ENABLE_ICMP	420	#if ENABLE_ICMP
307	bool	421	bool
308	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)
309	{	423	{
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);	424	pkt->unshift_hdr (4);
315		425
316	icmp_header hdr = (icmp_header )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
317	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
318	hdr->code = 255;	428	hdr->code = 255;
319	hdr->checksum = 0;	429	hdr->checksum = 0;
320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
321		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
322	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 ());
323		434
324	return true;	435	return true;
325	}	436	}
326	#endif	437	#endif
327		438
328	bool	439	bool
329	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)
330	{	441	{
331	#if defined(SOL_IP) && defined(IP_TOS)	442	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 ());	443	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335		444
336	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	}
337	}	465	}
338		466
339	void	467	void
340	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
341	{	469	{
342	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
343	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
344		472
345	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."),
346	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
347		475
348	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
349	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
350	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
351	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)."),
352	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
353	else if (dst > conns.size ())	481	else if (dst > conns.size ())
354	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)."),
355	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
356	else	484	else
357	{	485	{
358	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
359		487
360	if (dst == 0)	488	if (dst == 0)
361	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
362	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
363	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
364	{	492	{
365	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
366	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
367	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
368	else	496	else
369	slog (L_WARN,	497	slog (L_WARN,
370	_("%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?)."),
371	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
372	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
373	}	501	}
374	else	502	else
375	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
376	}	504	}
377	}	505	}
378		506
379	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
380	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
381	{	539	{
382	if (revents & (POLLIN \| POLLERR))	540	if (revents & EV_READ)
383	{	541	{
384	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
385	struct sockaddr_in sa;	543	struct sockaddr_in sa;
386	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
387	int len;	545	int len;
…		…
392		550
393	if (len > 0)	551	if (len > 0)
394	{	552	{
395	pkt->len = len;	553	pkt->len = len;
396		554
397	// 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
398	// this is slow, but...
399	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
400		557
401	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
402	}	559	}
403	else	560	else
404	{	561	{
405	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
406	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
407	}	564	}
408		565
409	delete pkt;	566	delete pkt;
410	}	567	}
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	568	else
418	{	569	{
419	slog (L_ERR,	570	slog (L_ERR,
420	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
421	revents);	572	revents);
422	exit (1);	573	exit (EXIT_FAILURE);
423	}	574	}
424	}	575	}
425		576
426	#if ENABLE_ICMP	577	#if ENABLE_ICMP
427	void	578	inline void
428	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
429	{	580	{
430	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
431	{	582	{
432	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
433	struct sockaddr_in sa;	584	struct sockaddr_in sa;
434	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
435	int len;	586	int len;
…		…
455	}	606	}
456	}	607	}
457	else	608	else
458	{	609	{
459	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
460	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
461	}	612	}
462		613
463	delete pkt;	614	delete pkt;
464	}	615	}
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	616	else
472	{	617	{
473	slog (L_ERR,	618	slog (L_ERR,
474	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
475	revents);	620	revents);
476	exit (1);	621	exit (EXIT_FAILURE);
477	}	622	}
478	}	623	}
479	#endif	624	#endif
480		625
481	void	626	inline void
482	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
483	{	628	{
484	if (revents & (POLLIN \| POLLERR))	629	if (revents & EV_READ)
485	{	630	{
486	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
487	struct sockaddr_in sa;	632	struct sockaddr_in sa;
488	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
489	int len;	634	int len;
…		…
499	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
500	}	645	}
501	else	646	else
502	{	647	{
503	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
504	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));
505	}	650	}
506		651
507	delete pkt;	652	delete pkt;
508	}	653	}
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	654	else
516	{	655	{
517	slog (L_ERR,	656	slog (L_ERR,
518	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
519	revents);	658	revents);
520	exit (1);	659	exit (EXIT_FAILURE);
521	}	660	}
522	}	661	}
523		662
524	void	663	inline void
525	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
526	{	665	{
527	if (revents & POLLIN)	666	if (revents & EV_READ)
528	{	667	{
529	/* process data */	668	/* process data */
530	tap_packet *pkt;	669	tap_packet *pkt;
531		670
532	pkt = tap->recv ();	671	pkt = tap->recv ();
…		…
539	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
540	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
541		680
542	if (src != THISNODE->id)	681	if (src != THISNODE->id)
543	{	682	{
544	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
545	exit (1);	684	exit (EXIT_FAILURE);
546	}	685	}
547		686
548	if (dst == THISNODE->id)	687	if (dst == THISNODE->id)
549	{	688	{
550	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	689	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
551	exit (1);	690	exit (EXIT_FAILURE);
552	}	691	}
553		692
554	if (dst > conns.size ())	693	if (dst > conns.size ())
555	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	694	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
556	else	695	else
557	{
558	if (dst)
559	{
560	// unicast
561	if (dst != THISNODE->id)
562	conns[dst - 1]->inject_data_packet (pkt);
563	}
564	else
565	{
566	// broadcast, this is ugly, but due to the security policy
567	// we have to connect to all hosts...
568	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
569	if ((*c)->conf != THISNODE)
570	(*c)->inject_data_packet (pkt);	696	inject_data_packet (pkt, dst);
571	}
572	}
573	}	697	}
574		698
575	delete pkt;	699	delete pkt;
576	}	700	}
577	else if (revents & (POLLHUP \| POLLERR))
578	{
579	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
580	exit (1);
581	}
582	else	701	else
583	abort ();	702	abort ();
584	}	703	}
585		704
586	void	705	inline void
587	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
588	{	707	{
589	if (events)	708	if (events)
590	{	709	{
591	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
592	{	711	{
593	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
594		713
595	shutdown_all ();	714	shutdown_all ();
596
597	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
598
599	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
600		717	exit (EXIT_SUCCESS);
601	exit (0);
602	}	718	}
603		719
604	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
605	{	721	{
606	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
607		723
608	reconnect_all ();	724	reconnect_all ();
609	}	725	}
610		726
611	events = 0;	727	events = 0;
612	}	728	}
613
614	w.at = TSTAMP_CANCEL;
615	}	729	}
616		730
617	void	731	void
618	vpn::shutdown_all ()	732	vpn::shutdown_all ()
619	{	733	{
…		…
629		743
630	conns.clear ();	744	conns.clear ();
631		745
632	connection_init ();	746	connection_init ();
633		747
634	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
635	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
636	{
637	connection *conn = new connection (this);
638		750
639	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
640	conns.push_back (conn);
641
642	conn->establish_connection ();	752	(*c)->establish_connection ();
643	}
644	}	753	}
645		754
646	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
647	{	756	{
648	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	{
649	connection *router = 0;	768	connection *router = 0;
650		769
		770	// first try to find a router with a direct connection, route there
		771	// regardless of any other considerations.
		772	{
		773	u32 prio = 1;
		774
		775	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		776	{
		777	connection c = i;
		778
		779	if (c->conf->routerprio > prio
		780	&& c->conf != THISNODE
		781	&& can_direct (c->conf, dst->conf)
		782	&& c->ictx && c->octx)
		783	{
		784	prio = c->conf->routerprio;
		785	router = c;
		786	}
		787	}
		788	}
		789
		790	if (router)
		791	return router;
		792
		793	// second try find the router with the highest priority, higher than ours
		794	{
		795	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		796
		797	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		798	{
		799	connection c = i;
		800
		801	if (c->conf->routerprio > prio
		802	&& c != dst
		803	&& c->conf != THISNODE
		804	&& c->ictx && c->octx)
		805	{
		806	prio = c->conf->routerprio;
		807	router = c;
		808	}
		809	}
		810	}
		811
		812	return router;
		813	}
		814
		815	void vpn::connection_established (connection *c)
		816	{
651	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	817	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
652	{	818	{
653	connection c = i;	819	connection o = i;
654		820
655	if (c->conf->routerprio > prio	821	if (!o->is_direct
656	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	822	&& o->si.valid ()
657	&& c->ictx && c->octx	823	&& c->si != o->si
658	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	824	&& c == find_router_for (o))
659	{
660	prio = c->conf->routerprio;
661	router = c;
662	}	825	{
		826	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		827	o->conf->nodename, c->conf->nodename);
		828	o->rekey ();
		829	}
663	}	830	}
664
665	return router;
666	}	831	}
667		832
668	void vpn::send_connect_request (int id)	833	void vpn::send_connect_request (connection *c)
669	{	834	{
670	connection *c = find_router ();	835	connection *r = find_router_for (c);
671		836
672	if (c)	837	if (r)
		838	{
		839	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		840	c->conf->nodename, r->conf->nodename);
673	c->send_connect_request (id);	841	r->send_connect_request (c->conf->id);
		842	}
674	else	843	else
675	// no router found, aggressively connect to all routers	844	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
676	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	845	c->conf->nodename);
677	if ((i)->conf->routerprio && (i)->conf != THISNODE)
678	(*i)->establish_connection ();
679	}	846	}
680		847
681	void	848	void
682	connection::dump_status ()	849	connection::dump_status ()
683	{	850	{
684	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	851	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
685	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	852	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
686	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	853	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
687	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	854	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
688	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	855	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
689	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
690	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
691	}	856	}
692		857
693	void	858	void
694	vpn::dump_status ()	859	vpn::dump_status ()
695	{	860	{
696	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	861	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
697		862
698	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	863	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
699	(*c)->dump_status ();	864	(*c)->dump_status ();
700		865
701	slog (L_NOTICE, _("END status dump"));	866	slog (L_NOTICE, _("END status dump"));
702	}	867	}
703		868
704	vpn::vpn (void)	869	vpn::vpn (void)
		870	{
705	: event (this, &vpn::event_cb)	871	event .set<vpn, &vpn::event_cb > (this);
706	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	872	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
707	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	873	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
708	#if ENABLE_TCP	874	#if ENABLE_TCP
709	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	875	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
710	#endif	876	#endif
711	#if ENABLE_ICMP	877	#if ENABLE_ICMP
712	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	878	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
713	#endif	879	#endif
714	, tap_ev_watcher (this, &vpn::tap_ev)	880	#if ENABLE_DNS
715	{	881	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		882	#endif
		883	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
716	}	884	}
717		885
718	vpn::~vpn ()	886	vpn::~vpn ()
719	{	887	{
720	}	888	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.17 by pcg, Wed Oct 15 06:06:41 2003 UTC vs. Revision 1.52 by pcg, Sun Aug 10 22:18:58 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.17 by pcg, Wed Oct 15 06:06:41 2003 UTC vs.
Revision 1.52 by pcg, Sun Aug 10 22:18:58 2008 UTC