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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.13 by pcg, Sun Apr 13 16:53:36 2003 UTC vs.
Revision 1.53 by pcg, Fri Aug 15 17:50:10 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>
35	#include <arpa/inet.h>	47	#include <sys/socket.h>
36	#include <netinet/in.h>	48
37	#include <netinet/ip_icmp.h>	49	#include "netcompat.h"
38		50
39	#include "pidfile.h"	51	#include "pidfile.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	#ifdef 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.
93	{	146	{
94	int oval = IP_PMTUDISC_DONT;	147	int oval = IP_PMTUDISC_DONT;
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);
125	}	183	}
126		184
127	#ifdef IP_MTU_DISCOVER	185	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128	// this I really consider a linux bug. I am neither connected	186	// this I really consider a linux bug. I am neither connected
129	// nor do I fragment myself. Linux still sets DF and doesn't	187	// nor do I fragment myself. Linux still sets DF and doesn't
130	// fragment for me sometimes.	188	// fragment for me sometimes.
131	{	189	{
132	int oval = IP_PMTUDISC_DONT;	190	int oval = IP_PMTUDISC_DONT;
…		…
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;
…		…
166		229
167	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	230	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168	}	231	}
169	#endif	232	#endif
170		233
171	#ifdef IP_MTU_DISCOVER	234	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
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	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	391	set_tos (ipv4_fd, ipv4_tos, tos);
277	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 ());
278		393
279	return true;	394	return true;
280	}	395	}
281		396
…		…
304		419
305	#if ENABLE_ICMP	420	#if ENABLE_ICMP
306	bool	421	bool
307	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)
308	{	423	{
309	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
310
311	pkt->unshift_hdr (4);	424	pkt->unshift_hdr (4);
312		425
313	icmphdr hdr = (icmphdr )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
314	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
315	hdr->code = 255;	428	hdr->code = 255;
316	hdr->checksum = 0;	429	hdr->checksum = 0;
317	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
318		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
319	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 ());
320		434
321	return true;	435	return true;
322	}	436	}
323	#endif	437	#endif
324		438
325	bool	439	bool
326	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)
327	{	441	{
328	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	442	set_tos (udpv4_fd, udpv4_tos, tos);
329	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 ());
330		444
331	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	}
332	}	465	}
333		466
334	void	467	void
335	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
336	{	469	{
337	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
338	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
339		472
340	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."),
341	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
342		475
343	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
344	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
345	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
346	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)."),
347	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
348	else if (dst > conns.size ())	481	else if (dst > conns.size ())
349	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)."),
350	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
351	else	484	else
352	{	485	{
353	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
354		487
355	if (dst == 0)	488	if (dst == 0)
356	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
357	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
358	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
359	{	492	{
360	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
361	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
362	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
363	else	496	else
364	slog (L_WARN,	497	slog (L_WARN,
365	_("%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?)."),
366	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
367	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
368	}	501	}
369	else	502	else
370	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
371	}	504	}
372	}	505	}
373		506
374	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
375	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
376	{	539	{
377	if (revents & (POLLIN \| POLLERR))	540	if (revents & EV_READ)
378	{	541	{
379	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
380	struct sockaddr_in sa;	543	struct sockaddr_in sa;
381	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
382	int len;	545	int len;
…		…
387		550
388	if (len > 0)	551	if (len > 0)
389	{	552	{
390	pkt->len = len;	553	pkt->len = len;
391		554
392	// 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
393	// this is slow, but...
394	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
395		557
396	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
397	}	559	}
398	else	560	else
399	{	561	{
400	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
401	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
402	}	564	}
403		565
404	delete pkt;	566	delete pkt;
405	}	567	}
406	else if (revents & POLLHUP)
407	{
408	// this cannot ;) happen on udp sockets
409	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
410	exit (1);
411	}
412	else	568	else
413	{	569	{
414	slog (L_ERR,	570	slog (L_ERR,
415	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
416	revents);	572	revents);
417	exit (1);	573	exit (EXIT_FAILURE);
418	}	574	}
419	}	575	}
420		576
421	#if ENABLE_ICMP	577	#if ENABLE_ICMP
422	void	578	inline void
423	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
424	{	580	{
425	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
426	{	582	{
427	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
428	struct sockaddr_in sa;	584	struct sockaddr_in sa;
429	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
430	int len;	586	int len;
…		…
435		591
436	if (len > 0)	592	if (len > 0)
437	{	593	{
438	pkt->len = len;	594	pkt->len = len;
439		595
440	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	596	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
441		597
442	if (hdr->type == ::conf.icmp_type	598	if (hdr->type == ::conf.icmp_type
443	&& hdr->code == 255)	599	&& hdr->code == 255)
444	{	600	{
445	// raw sockets deliver the ipv4, but don't expect it on sends	601	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
450	}	606	}
451	}	607	}
452	else	608	else
453	{	609	{
454	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
455	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
456	}	612	}
457		613
458	delete pkt;	614	delete pkt;
459	}	615	}
460	else if (revents & POLLHUP)
461	{
462	// this cannot ;) happen on udp sockets
463	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
464	exit (1);
465	}
466	else	616	else
467	{	617	{
468	slog (L_ERR,	618	slog (L_ERR,
469	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
470	revents);	620	revents);
471	exit (1);	621	exit (EXIT_FAILURE);
472	}	622	}
473	}	623	}
474	#endif	624	#endif
475		625
476	void	626	inline void
477	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
478	{	628	{
479	if (revents & (POLLIN \| POLLERR))	629	if (revents & EV_READ)
480	{	630	{
481	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
482	struct sockaddr_in sa;	632	struct sockaddr_in sa;
483	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
484	int len;	634	int len;
…		…
494	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
495	}	645	}
496	else	646	else
497	{	647	{
498	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
499	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));
500	}	650	}
501		651
502	delete pkt;	652	delete pkt;
503	}	653	}
504	else if (revents & POLLHUP)
505	{
506	// this cannot ;) happen on udp sockets
507	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
508	exit (1);
509	}
510	else	654	else
511	{	655	{
512	slog (L_ERR,	656	slog (L_ERR,
513	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
514	revents);	658	revents);
515	exit (1);	659	exit (EXIT_FAILURE);
516	}	660	}
517	}	661	}
518		662
519	void	663	inline void
520	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
521	{	665	{
522	if (revents & POLLIN)	666	if (revents & EV_READ)
523	{	667	{
524	/* process data */	668	/* process data */
525	tap_packet *pkt;	669	tap_packet *pkt;
526		670
527	pkt = tap->recv ();	671	pkt = tap->recv ();
528		672
		673	if (!pkt)
		674	return;
		675
		676	if (pkt->len > 14)
		677	{
529	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
530	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
531		680
532	if (src != THISNODE->id)	681	if (src != THISNODE->id)
533	{
534	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
535	exit (1);
536	}
537
538	if (dst == THISNODE->id)
539	{
540	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
541	exit (1);
542	}
543
544	if (dst > conns.size ())
545	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
546	else
547	{
548	if (dst)
549	{	682	{
550	// unicast	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
551	if (dst != THISNODE->id)	684	exit (EXIT_FAILURE);
552	conns[dst - 1]->inject_data_packet (pkt);
553	}	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);
554	else	695	else
555	{
556	// broadcast, this is ugly, but due to the security policy
557	// we have to connect to all hosts...
558	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
559	if ((*c)->conf != THISNODE)
560	(*c)->inject_data_packet (pkt);	696	inject_data_packet (pkt, dst);
561	}
562	}	697	}
563		698
564	delete pkt;	699	delete pkt;
565	}	700	}
566	else if (revents & (POLLHUP \| POLLERR))
567	{
568	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
569	exit (1);
570	}
571	else	701	else
572	abort ();	702	abort ();
573	}	703	}
574		704
575	void	705	inline void
576	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
577	{	707	{
578	if (events)	708	if (events)
579	{	709	{
580	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
581	{	711	{
582	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
583		713
584	shutdown_all ();	714	shutdown_all ();
585
586	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
587
588	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
589		717	exit (EXIT_SUCCESS);
590	exit (0);
591	}	718	}
592		719
593	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
594	{	721	{
595	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
596		723
597	reconnect_all ();	724	reconnect_all ();
598	}	725	}
599		726
600	events = 0;	727	events = 0;
601	}	728	}
602
603	w.at = TSTAMP_CANCEL;
604	}	729	}
605		730
606	void	731	void
607	vpn::shutdown_all ()	732	vpn::shutdown_all ()
608	{	733	{
…		…
618		743
619	conns.clear ();	744	conns.clear ();
620		745
621	connection_init ();	746	connection_init ();
622		747
623	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
624	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
625	{
626	connection *conn = new connection (this);
627		750
628	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
629	conns.push_back (conn);
630
631	conn->establish_connection ();	752	(*c)->establish_connection ();
632	}
633	}	753	}
634		754
635	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
636	{	756	{
637	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	{
638	connection *router = 0;	768	connection *router = 0;
639		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	{
640	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	817	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641	{	818	{
642	connection c = i;	819	connection o = i;
643		820
644	if (c->conf->routerprio > prio	821	if (!o->is_direct
645	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	822	&& o->si.valid ()
646	&& c->ictx && c->octx	823	&& c->si != o->si
647	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	824	&& c == find_router_for (o))
648	{
649	prio = c->conf->routerprio;
650	router = c;
651	}	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	}
652	}	830	}
653
654	return router;
655	}	831	}
656		832
657	void vpn::send_connect_request (int id)	833	void vpn::send_connect_request (connection *c)
658	{	834	{
659	connection *c = find_router ();	835	connection *r = find_router_for (c);
660		836
661	if (c)	837	if (r)
		838	{
		839	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		840	c->conf->nodename, r->conf->nodename);
662	c->send_connect_request (id);	841	r->send_connect_request (c->conf->id);
		842	}
663	else	843	else
664	// no router found, aggressively connect to all routers	844	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
665	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	845	c->conf->nodename);
666	if ((i)->conf->routerprio && (i)->conf != THISNODE)
667	(*i)->establish_connection ();
668	}	846	}
669		847
670	void	848	void
671	connection::dump_status ()	849	connection::dump_status ()
672	{	850	{
673	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	851	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
674	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	852	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
675	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	853	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
676	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"),
677	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	855	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
678	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
679	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
680	}	856	}
681		857
682	void	858	void
683	vpn::dump_status ()	859	vpn::dump_status ()
684	{	860	{
685	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	861	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
686		862
687	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	863	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
688	(*c)->dump_status ();	864	(*c)->dump_status ();
689		865
690	slog (L_NOTICE, _("END status dump"));	866	slog (L_NOTICE, _("END status dump"));
691	}	867	}
692		868
693	vpn::vpn (void)	869	vpn::vpn (void)
		870	{
694	: event (this, &vpn::event_cb)	871	event .set<vpn, &vpn::event_cb > (this);
695	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	872	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
696	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	873	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
697	#if ENABLE_TCP	874	#if ENABLE_TCP
698	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	875	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
699	#endif	876	#endif
700	#if ENABLE_ICMP	877	#if ENABLE_ICMP
701	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	878	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
702	#endif	879	#endif
703	, tap_ev_watcher (this, &vpn::tap_ev)	880	#if ENABLE_DNS
704	{	881	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		882	#endif
		883	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
705	}	884	}
706		885
707	vpn::~vpn ()	886	vpn::~vpn ()
708	{	887	{
709	}	888	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.13 by pcg, Sun Apr 13 16:53:36 2003 UTC vs. Revision 1.53 by pcg, Fri Aug 15 17:50:10 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.13 by pcg, Sun Apr 13 16:53:36 2003 UTC vs.
Revision 1.53 by pcg, Fri Aug 15 17:50:10 2008 UTC