[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 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/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	ipv4_tos = -1;
78	ipv4_fd = -1;	128	ipv4_fd = -1;
79		129
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	131	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
83		133
84	if (ipv4_fd < 0)	134	if (ipv4_fd < 0)
85	return -1;	135	return -1;
86		136
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
88		139
89	#ifdef IP_MTU_DISCOVER	140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
91	// nor do I fragment myself. Linux still sets DF and doesn't	142	// nor do I fragment myself. Linux still sets DF and doesn't
92	// fragment for me sometimes.	143	// fragment for me sometimes.
93	{	144	{
94	int oval = IP_PMTUDISC_DONT;	145	int oval = IP_PMTUDISC_DONT;
98		149
99	sockinfo si (THISNODE, PROT_IPv4);	150	sockinfo si (THISNODE, PROT_IPv4);
100		151
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	153	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	154	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
104	exit (1);	155	exit (EXIT_FAILURE);
105	}	156	}
106		157
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
108	}	159	}
109		160
		161	udpv4_tos = -1;
110	udpv4_fd = -1;	162	udpv4_fd = -1;
111		163
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	165	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		167
116	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
117	return -1;	169	return -1;
118		170
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
120		173
121	// standard daemon practise...	174	// standard daemon practise...
122	{	175	{
123	int oval = 1;	176	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125	}	178	}
126		179
127	#ifdef IP_MTU_DISCOVER	180	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128	// this I really consider a linux bug. I am neither connected	181	// this I really consider a linux bug. I am neither connected
129	// nor do I fragment myself. Linux still sets DF and doesn't	182	// nor do I fragment myself. Linux still sets DF and doesn't
130	// fragment for me sometimes.	183	// fragment for me sometimes.
131	{	184	{
132	int oval = IP_PMTUDISC_DONT;	185	int oval = IP_PMTUDISC_DONT;
…		…
136		189
137	sockinfo si (THISNODE, PROT_UDPv4);	190	sockinfo si (THISNODE, PROT_UDPv4);
138		191
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	193	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	194	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
142	exit (1);	195	exit (EXIT_FAILURE);
143	}	196	}
144		197
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
146	}	199	}
147		200
		201	icmpv4_tos = -1;
148	icmpv4_fd = -1;	202	icmpv4_fd = -1;
149		203
150	#if ENABLE_ICMP	204	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	205	if (THISNODE->protocols & PROT_ICMPv4)
152	{	206	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		208
155	if (icmpv4_fd < 0)	209	if (icmpv4_fd < 0)
156	return -1;	210	return -1;
157		211
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
159		214
160	#ifdef ICMP_FILTER	215	#ifdef ICMP_FILTER
161	{	216	{
162	icmp_filter oval;	217	icmp_filter oval;
163	oval.data = 0xffffffff;	218	oval.data = 0xffffffff;
…		…
166		221
167	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168	}	223	}
169	#endif	224	#endif
170		225
171	#ifdef IP_MTU_DISCOVER	226	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172	// this I really consider a linux bug. I am neither connected	227	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	228	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	229	// fragment for me sometimes.
175	{	230	{
176	int oval = IP_PMTUDISC_DONT;	231	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	233	}
179	#endif	234	#endif
180		235
181	sockinfo si (THISNODE, PROT_ICMPv4);	236	sockinfo si (THISNODE, PROT_ICMPv4);
182		237
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	239	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	240	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
186	exit (1);	241	exit (EXIT_FAILURE);
187	}	242	}
188		243
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
190	}	245	}
191	#endif	246	#endif
192		247
193	tcpv4_fd = -1;	248	tcpv4_fd = -1;
194		249
…		…
199		254
200	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
201	return -1;	256	return -1;
202		257
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
204		260
205	// standard daemon practise...	261	// standard daemon practise...
206	{	262	{
207	int oval = 1;	263	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
210		266
211	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
212		268
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	270	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	271	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
216	exit (1);	272	exit (EXIT_FAILURE);
217	}	273	}
218		274
219	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
220	{	276	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	277	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
222	exit (1);	278	exit (EXIT_FAILURE);
		279	}
		280
		281	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		282	}
		283	#endif
		284
		285	dnsv4_tos = -1;
		286	dnsv4_fd = -1;
		287
		288	#if ENABLE_DNS
		289	if (THISNODE->protocols & PROT_DNSv4)
		290	{
		291	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		292
		293	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		294
		295	if (dnsv4_fd < 0)
		296	return -1;
		297
		298	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		299	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		300
		301	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		302	// this I really consider a linux bug. I am neither connected
		303	// nor do I fragment myself. Linux still sets DF and doesn't
		304	// fragment for me sometimes.
		305	{
		306	int oval = IP_PMTUDISC_DONT;
		307	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
223	}	308	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#endif	309	# endif
		310
		311	// standard daemon practise...
		312	{
		313	int oval = 1;
		314	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		315	}
		316
		317	sockinfo si (THISNODE->dns_hostname,
		318	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		319	PROT_DNSv4);
		320
		321	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		322	{
		323	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		324	exit (EXIT_FAILURE);
		325	}
		326
		327	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		328	}
		329	#endif
		330
		331	/////////////////////////////////////////////////////////////////////////////
		332
		333	reconnect_all ();
		334
		335	/////////////////////////////////////////////////////////////////////////////
228		336
229	tap = new tap_device ();	337	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
231	{	339	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
233	exit (1);	341	exit (EXIT_FAILURE);
234	}	342	}
235		343
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		345
		346	run_script_cb cb;
		347	cb.set<vpn, &vpn::script_if_init> (this);
		348
		349	if (tap->if_up () &&
		350	!run_script (cb, true))
		351	{
		352	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		353	tap->if_up ());
		354	exit (EXIT_FAILURE);
		355	}
		356
		357	cb.set<vpn, &vpn::script_if_up> (this);
		358	if (!run_script (cb, true))
		359	{
		360	slog (L_ERR, _("if-up command execution failed, exiting."));
		361	exit (EXIT_FAILURE);
		362	}
		363
238	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		365
242	return 0;	366	return 0;
243	}
244
245	// send a vpn packet out to other hosts
246	bool
247	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
248	{
249	switch (si.prot)
250	{
251	case PROT_IPv4:
252	return send_ipv4_packet (pkt, si, tos);
253
254	case PROT_UDPv4:
255	return send_udpv4_packet (pkt, si, tos);
256
257	#if ENABLE_TCP
258	case PROT_TCPv4:
259	return send_tcpv4_packet (pkt, si, tos);
260	#endif
261
262	#if ENABLE_ICMP
263	case PROT_ICMPv4:
264	return send_icmpv4_packet (pkt, si, tos);
265	#endif
266
267	default:
268	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
269	return false;
270	}
271	}	367	}
272		368
273	bool	369	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	370	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	371	{
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	372	set_tos (ipv4_fd, ipv4_tos, tos);
277	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	373	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278		374
279	return true;	375	return true;
280	}	376	}
281		377
…		…
304		400
305	#if ENABLE_ICMP	401	#if ENABLE_ICMP
306	bool	402	bool
307	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	403	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
308	{	404	{
309	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
310
311	pkt->unshift_hdr (4);	405	pkt->unshift_hdr (4);
312		406
313	icmphdr hdr = (icmphdr )&((*pkt)[0]);	407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
314	hdr->type = ::conf.icmp_type;	408	hdr->type = ::conf.icmp_type;
315	hdr->code = 255;	409	hdr->code = 255;
316	hdr->checksum = 0;	410	hdr->checksum = 0;
317	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
318		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
319	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	414	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
320		415
321	return true;	416	return true;
322	}	417	}
323	#endif	418	#endif
324		419
325	bool	420	bool
326	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	421	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
327	{	422	{
328	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	423	set_tos (udpv4_fd, udpv4_tos, tos);
329	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	424	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
330		425
331	return true;	426	return true;
		427	}
		428
		429	void
		430	vpn::inject_data_packet (tap_packet *pkt, int dst)
		431	{
		432	if (dst)
		433	{
		434	// unicast
		435	if (dst != THISNODE->id)
		436	conns[dst - 1]->inject_data_packet (pkt);
		437	}
		438	else
		439	{
		440	// broadcast, this is ugly, but due to the security policy
		441	// we have to connect to all hosts...
		442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		443	if ((*c)->conf != THISNODE)
		444	(*c)->inject_data_packet (pkt);
		445	}
332	}	446	}
333		447
334	void	448	void
335	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
336	{	450	{
337	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
338	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
339		453
340	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	454	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
341	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
342		456
343	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
344	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
345	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
346	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	460	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
347	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
348	else if (dst > conns.size ())	462	else if (dst > conns.size ())
349	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	463	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
350	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
351	else	465	else
352	{	466	{
353	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
354		468
355	if (dst == 0)	469	if (dst == 0)
356	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
357	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
358	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
359	{	473	{
360	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
361	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
362	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
363	else	477	else
364	slog (L_WARN,	478	slog (L_WARN,
365	_("%s(%s): forwarding request (=> %s), but we are no router"),	479	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
366	c->conf->nodename, (const char *)rsi,	480	c->conf->nodename, (const char *)rsi,
367	conns[dst - 1]->conf->nodename);	481	conns[dst - 1]->conf->nodename);
368	}	482	}
369	else	483	else
370	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
371	}	485	}
372	}	486	}
373		487
374	void	488	bool
		489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		490	{
		491	switch (si.prot)
		492	{
		493	case PROT_IPv4:
		494	return send_ipv4_packet (pkt, si, tos);
		495
		496	case PROT_UDPv4:
		497	return send_udpv4_packet (pkt, si, tos);
		498
		499	#if ENABLE_TCP
		500	case PROT_TCPv4:
		501	return send_tcpv4_packet (pkt, si, tos);
		502	#endif
		503	#if ENABLE_ICMP
		504	case PROT_ICMPv4:
		505	return send_icmpv4_packet (pkt, si, tos);
		506	#endif
		507	#if ENABLE_DNS
		508	case PROT_DNSv4:
		509	return send_dnsv4_packet (pkt, si, tos);
		510	#endif
		511	default:
		512	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		513	}
		514
		515	return false;
		516	}
		517
		518	inline void
375	vpn::ipv4_ev (io_watcher &w, short revents)	519	vpn::ipv4_ev (ev::io &w, int revents)
376	{	520	{
377	if (revents & (POLLIN \| POLLERR))	521	if (revents & EV_READ)
378	{	522	{
379	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
380	struct sockaddr_in sa;	524	struct sockaddr_in sa;
381	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
382	int len;	526	int len;
…		…
387		531
388	if (len > 0)	532	if (len > 0)
389	{	533	{
390	pkt->len = len;	534	pkt->len = len;
391		535
392	// raw sockets deliver the ipv4, but don't expect it on sends	536	// raw sockets deliver the ipv4 header, but don't expect it on sends
393	// this is slow, but...
394	pkt->skip_hdr (IP_OVERHEAD);	537	pkt->skip_hdr (IP_OVERHEAD);
395		538
396	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
397	}	540	}
398	else	541	else
399	{	542	{
400	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
401	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
402	}	545	}
403		546
404	delete pkt;	547	delete pkt;
405	}	548	}
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	549	else
413	{	550	{
414	slog (L_ERR,	551	slog (L_ERR,
415	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
416	revents);	553	revents);
417	exit (1);	554	exit (EXIT_FAILURE);
418	}	555	}
419	}	556	}
420		557
421	#if ENABLE_ICMP	558	#if ENABLE_ICMP
422	void	559	inline void
423	vpn::icmpv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
424	{	561	{
425	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
426	{	563	{
427	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
428	struct sockaddr_in sa;	565	struct sockaddr_in sa;
429	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
430	int len;	567	int len;
…		…
435		572
436	if (len > 0)	573	if (len > 0)
437	{	574	{
438	pkt->len = len;	575	pkt->len = len;
439		576
440	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
441		578
442	if (hdr->type == ::conf.icmp_type	579	if (hdr->type == ::conf.icmp_type
443	&& hdr->code == 255)	580	&& hdr->code == 255)
444	{	581	{
445	// raw sockets deliver the ipv4, but don't expect it on sends	582	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
450	}	587	}
451	}	588	}
452	else	589	else
453	{	590	{
454	// probably ECONNRESET or somesuch	591	// probably ECONNRESET or somesuch
455	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
456	}	593	}
457		594
458	delete pkt;	595	delete pkt;
459	}	596	}
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	597	else
467	{	598	{
468	slog (L_ERR,	599	slog (L_ERR,
469	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, exiting.\n"),
470	revents);	601	revents);
471	exit (1);	602	exit (EXIT_FAILURE);
472	}	603	}
473	}	604	}
474	#endif	605	#endif
475		606
476	void	607	inline void
477	vpn::udpv4_ev (io_watcher &w, short revents)	608	vpn::udpv4_ev (ev::io &w, int revents)
478	{	609	{
479	if (revents & (POLLIN \| POLLERR))	610	if (revents & EV_READ)
480	{	611	{
481	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
482	struct sockaddr_in sa;	613	struct sockaddr_in sa;
483	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
484	int len;	615	int len;
…		…
494	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
495	}	626	}
496	else	627	else
497	{	628	{
498	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
499	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	630	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
500	}	631	}
501		632
502	delete pkt;	633	delete pkt;
503	}	634	}
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	635	else
511	{	636	{
512	slog (L_ERR,	637	slog (L_ERR,
513	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
514	revents);	639	revents);
515	exit (1);	640	exit (EXIT_FAILURE);
516	}	641	}
517	}	642	}
518		643
519	void	644	inline void
520	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
521	{	646	{
522	if (revents & POLLIN)	647	if (revents & EV_READ)
523	{	648	{
524	/* process data */	649	/* process data */
525	tap_packet *pkt;	650	tap_packet *pkt;
526		651
527	pkt = tap->recv ();	652	pkt = tap->recv ();
528		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
529	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
530	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
531		661
532	if (src != THISNODE->id)	662	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	{	663	{
550	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
551	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
552	conns[dst - 1]->inject_data_packet (pkt);
553	}	666	}
		667
		668	if (dst == THISNODE->id)
		669	{
		670	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		671	exit (EXIT_FAILURE);
		672	}
		673
		674	if (dst > conns.size ())
		675	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
554	else	676	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);	677	inject_data_packet (pkt, dst);
561	}
562	}	678	}
563		679
564	delete pkt;	680	delete pkt;
565	}
566	else if (revents & (POLLHUP \| POLLERR))
567	{
568	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
569	exit (1);
570	}	681	}
571	else	682	else
572	abort ();	683	abort ();
573	}	684	}
574		685
575	void	686	inline void
576	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
577	{	688	{
578	if (events)	689	if (events)
579	{	690	{
580	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
581	{	692	{
582	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
583		694
584	shutdown_all ();	695	shutdown_all ();
585
586	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
587
588	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
589		698	exit (EXIT_SUCCESS);
590	exit (0);
591	}	699	}
592		700
593	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
594	{	702	{
595	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
596		704
597	reconnect_all ();	705	reconnect_all ();
598	}	706	}
599		707
600	events = 0;	708	events = 0;
601	}	709	}
602
603	w.at = TSTAMP_CANCEL;
604	}	710	}
605		711
606	void	712	void
607	vpn::shutdown_all ()	713	vpn::shutdown_all ()
608	{	714	{
…		…
618		724
619	conns.clear ();	725	conns.clear ();
620		726
621	connection_init ();	727	connection_init ();
622		728
623	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
624	i != conf.nodes.end (); ++i)	730	conns.push_back (new connection (this, *i));
625	{
626	connection *conn = new connection (this);
627		731
628	conn->conf = *i;	732	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
629	conns.push_back (conn);
630
631	conn->establish_connection ();	733	(*c)->establish_connection ();
632	}
633	}	734	}
634		735
635	connection *vpn::find_router ()	736	bool vpn::can_direct (conf_node src, conf_node dst) const
636	{	737	{
637	u32 prio = 1;	738	return src != dst
		739	&& src->may_direct (dst)
		740	&& dst->may_direct (src)
		741	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		742	\|\| (src->protocols & dst->connectable_protocols ()));
		743	}
		744
		745	// only works for indirect and routed connections: find a router
		746	// from THISNODE to dst
		747	connection vpn::find_router_for (const connection dst)
		748	{
638	connection *router = 0;	749	connection *router = 0;
639		750
		751	// first try to find a router with a direct connection
		752	{
		753	u32 prio = 1;
		754
		755	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		756	{
		757	connection c = i;
		758
		759	if (c->conf->routerprio > prio
		760	&& c->conf != THISNODE
		761	&& c != dst
		762	&& can_direct (c->conf, dst->conf))
		763	{
		764	if (c->ictx && c->octx)
		765	{
		766	prio = c->conf->routerprio;
		767	router = c;
		768	}
		769	else
		770	c->establish_connection ();
		771	}
		772	}
		773	}
		774
		775	if (router)
		776	return router;
		777
		778	// second try find the router with the highest priority higher than ours
		779	{
		780	u32 prio = 1;
		781
		782	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		783	{
		784	connection c = i;
		785
		786	if (c->conf->routerprio > prio
		787	&& c->conf->routerprio > THISNODE->routerprio
		788	&& c != dst
		789	&& c->conf != THISNODE)
		790	{
		791	if (c->ictx && c->octx)
		792	{
		793	prio = c->conf->routerprio;
		794	router = c;
		795	}
		796	else
		797	c->establish_connection ();
		798	}
		799	}
		800	}
		801	return router;
		802	}
		803
		804	void vpn::connection_established (connection *c)
		805	{
640	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	806	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641	{	807	{
642	connection c = i;	808	connection o = i;
643		809
644	if (c->conf->routerprio > prio	810	if (!o->is_direct
645	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	811	&& o->si.valid ()
646	&& c->ictx && c->octx	812	&& c->si != o->si
647	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	813	&& c == find_router_for (o))
648	{
649	prio = c->conf->routerprio;
650	router = c;
651	}	814	{
		815	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		816	o->conf->nodename, c->conf->nodename);
		817	o->rekey ();
		818	}
652	}	819	}
653
654	return router;
655	}	820	}
656		821
657	void vpn::send_connect_request (int id)	822	void vpn::send_connect_request (connection *c)
658	{	823	{
659	connection *c = find_router ();	824	connection *r = find_router_for (c);
660		825
661	if (c)	826	if (r)
		827	{
		828	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		829	c->conf->nodename, r->conf->nodename);
662	c->send_connect_request (id);	830	r->send_connect_request (c->conf->id);
		831	}
663	else	832	else
664	// no router found, aggressively connect to all routers	833	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
665	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	834	c->conf->nodename);
666	if ((i)->conf->routerprio && (i)->conf != THISNODE)
667	(*i)->establish_connection ();
668	}	835	}
669		836
670	void	837	void
671	connection::dump_status ()	838	connection::dump_status ()
672	{	839	{
673	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	840	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
674	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	841	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
675	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	842	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
676	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	843	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
677	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	844	(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	}	845	}
681		846
682	void	847	void
683	vpn::dump_status ()	848	vpn::dump_status ()
684	{	849	{
685	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	850	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
686		851
687	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	852	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
688	(*c)->dump_status ();	853	(*c)->dump_status ();
689		854
690	slog (L_NOTICE, _("END status dump"));	855	slog (L_NOTICE, _("END status dump"));
691	}	856	}
692		857
693	vpn::vpn (void)	858	vpn::vpn (void)
		859	{
694	: event (this, &vpn::event_cb)	860	event .set<vpn, &vpn::event_cb > (this);
695	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	861	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
696	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	862	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
697	#if ENABLE_TCP	863	#if ENABLE_TCP
698	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	864	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
699	#endif	865	#endif
700	#if ENABLE_ICMP	866	#if ENABLE_ICMP
701	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	867	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
702	#endif	868	#endif
703	, tap_ev_watcher (this, &vpn::tap_ev)	869	#if ENABLE_DNS
704	{	870	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		871	#endif
		872	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
705	}	873	}
706		874
707	vpn::~vpn ()	875	vpn::~vpn ()
708	{	876	{
709	}	877	}

Diff Legend

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

Comparing gvpe/src/vpn.C (file contents): Revision 1.13 by pcg, Sun Apr 13 16:53:36 2003 UTC vs. Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.13 by pcg, Sun Apr 13 16:53:36 2003 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC