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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 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 <arpa/inet.h>	46	#include <fcntl.h>
35	#include <netinet/in.h>	47	#include <sys/socket.h>
36	#include <netinet/ip_icmp.h>	48
		49	#include "netcompat.h"
37		50
38	#include "pidfile.h"	51	#include "pidfile.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	ipv4_tos = -1;
77	ipv4_fd = -1;	128	ipv4_fd = -1;
78		129
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	131	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		133
83	if (ipv4_fd < 0)	134	if (ipv4_fd < 0)
84	return -1;	135	return -1;
85		136
86	#ifdef IP_MTU_DISCOVER	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		139
		140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
88	// 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
89	// fragment for me sometimes.	143	// fragment for me sometimes.
90	{	144	{
91	int oval = IP_PMTUDISC_DONT;	145	int oval = IP_PMTUDISC_DONT;
95		149
96	sockinfo si (THISNODE, PROT_IPv4);	150	sockinfo si (THISNODE, PROT_IPv4);
97		151
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	153	{
100	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));
101	exit (1);	155	exit (EXIT_FAILURE);
102	}	156	}
103		157
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
105	}	159	}
106		160
		161	udpv4_tos = -1;
107	udpv4_fd = -1;	162	udpv4_fd = -1;
108		163
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	165	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		167
113	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
114	return -1;	169	return -1;
115		170
		171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
		173
116	// standard daemon practise...	174	// standard daemon practise...
117	{	175	{
118	int oval = 1;	176	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	178	}
121		179
122	#ifdef IP_MTU_DISCOVER	180	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	181	// this I really consider a linux bug. I am neither connected
124	// 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
125	// fragment for me sometimes.	183	// fragment for me sometimes.
126	{	184	{
127	int oval = IP_PMTUDISC_DONT;	185	int oval = IP_PMTUDISC_DONT;
…		…
131		189
132	sockinfo si (THISNODE, PROT_UDPv4);	190	sockinfo si (THISNODE, PROT_UDPv4);
133		191
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	193	{
136	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));
137	exit (1);	195	exit (EXIT_FAILURE);
138	}	196	}
139		197
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
141	}	199	}
142		200
		201	icmpv4_tos = -1;
143	icmpv4_fd = -1;	202	icmpv4_fd = -1;
144		203
145	#if ENABLE_ICMP	204	#if ENABLE_ICMP
146	if (THISNODE->protocols & PROT_ICMPv4)	205	if (THISNODE->protocols & PROT_ICMPv4)
147	{	206	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		208
150	if (icmpv4_fd < 0)	209	if (icmpv4_fd < 0)
151	return -1;	210	return -1;
		211
		212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
152		214
153	#ifdef ICMP_FILTER	215	#ifdef ICMP_FILTER
154	{	216	{
155	icmp_filter oval;	217	icmp_filter oval;
156	oval.data = 0xffffffff;	218	oval.data = 0xffffffff;
…		…
159		221
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	223	}
162	#endif	224	#endif
163		225
164	#ifdef IP_MTU_DISCOVER	226	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	227	// this I really consider a linux bug. I am neither connected
166	// 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
167	// fragment for me sometimes.	229	// fragment for me sometimes.
168	{	230	{
169	int oval = IP_PMTUDISC_DONT;	231	int oval = IP_PMTUDISC_DONT;
170	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171	}	233	}
172	#endif	234	#endif
173		235
174	sockinfo si (THISNODE, PROT_ICMPv4);	236	sockinfo si (THISNODE, PROT_ICMPv4);
175		237
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	239	{
178	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));
179	exit (1);	241	exit (EXIT_FAILURE);
180	}	242	}
181		243
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
183	}	245	}
184	#endif	246	#endif
185		247
186	tcpv4_fd = -1;	248	tcpv4_fd = -1;
187		249
…		…
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	253	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		254
193	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
194	return -1;	256	return -1;
195		257
		258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		260
196	// standard daemon practise...	261	// standard daemon practise...
197	{	262	{
198	int oval = 1;	263	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
200	}	265	}
201		266
202	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
203		268
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	270	{
206	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));
207	exit (1);	272	exit (EXIT_FAILURE);
208	}	273	}
209		274
210	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
211	{	276	{
212	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));
213	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);
214	}	308	}
215
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
217	}
218	#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	/////////////////////////////////////////////////////////////////////////////
219		336
220	tap = new tap_device ();	337	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
222	{	339	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
224	exit (1);	341	exit (EXIT_FAILURE);
225	}	342	}
226		343
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
228		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
229	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
230
231	reconnect_all ();
232		365
233	return 0;	366	return 0;
234	}
235
236	// send a vpn packet out to other hosts
237	bool
238	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
239	{
240	switch (si.prot)
241	{
242	case PROT_IPv4:
243	return send_ipv4_packet (pkt, si, tos);
244
245	case PROT_UDPv4:
246	return send_udpv4_packet (pkt, si, tos);
247
248	#if ENABLE_TCP
249	case PROT_TCPv4:
250	return send_tcpv4_packet (pkt, si, tos);
251	#endif
252
253	#if ENABLE_ICMP
254	case PROT_ICMPv4:
255	return send_icmpv4_packet (pkt, si, tos);
256	#endif
257
258	default:
259	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
260	return false;
261	}
262	}	367	}
263		368
264	bool	369	bool
265	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)
266	{	371	{
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	372	set_tos (ipv4_fd, ipv4_tos, tos);
268	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 ());
269		374
270	return true;	375	return true;
271	}	376	}
272		377
…		…
291	sum += (sum >> 16); // carry	396	sum += (sum >> 16); // carry
292		397
293	return ~sum;	398	return ~sum;
294	}	399	}
295		400
		401	#if ENABLE_ICMP
296	bool	402	bool
297	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)
298	{	404	{
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
300
301	pkt->unshift_hdr (4);	405	pkt->unshift_hdr (4);
302		406
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	408	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	409	hdr->code = 255;
306	hdr->checksum = 0;	410	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
309	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 ());
310		415
311	return true;	416	return true;
312	}	417	}
		418	#endif
313		419
314	bool	420	bool
315	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)
316	{	422	{
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	423	set_tos (udpv4_fd, udpv4_tos, tos);
318	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 ());
319		425
320	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	}
321	}	446	}
322		447
323	void	448	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	450	{
326	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
327	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
328		453
329	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."),
330	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
331		456
332	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
333	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
334	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
335	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)."),
336	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
337	else if (dst > conns.size ())	462	else if (dst > conns.size ())
338	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)."),
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	465	else
341	{	466	{
342	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
343		468
344	if (dst == 0 && !THISNODE->routerprio)	469	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
346	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
348	{	473	{
349	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	477	else
353	slog (L_WARN,	478	slog (L_WARN,
354	_("%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?)."),
355	c->conf->nodename, (const char *)rsi,	480	c->conf->nodename, (const char *)rsi,
356	conns[dst - 1]->conf->nodename);	481	conns[dst - 1]->conf->nodename);
357	}	482	}
358	else	483	else
359	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
360	}	485	}
361	}	486	}
362		487
363	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
364	vpn::ipv4_ev (io_watcher &w, short revents)	519	vpn::ipv4_ev (ev::io &w, int revents)
365	{	520	{
366	if (revents & (POLLIN \| POLLERR))	521	if (revents & EV_READ)
367	{	522	{
368	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	524	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
371	int len;	526	int len;
…		…
376		531
377	if (len > 0)	532	if (len > 0)
378	{	533	{
379	pkt->len = len;	534	pkt->len = len;
380		535
381	// 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
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	537	pkt->skip_hdr (IP_OVERHEAD);
384		538
385	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
386	}	540	}
387	else	541	else
388	{	542	{
389	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
391	}	545	}
392		546
393	delete pkt;	547	delete pkt;
394	}	548	}
395	else if (revents & POLLHUP)
396	{
397	// this cannot ;) happen on udp sockets
398	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
399	exit (1);
400	}
401	else	549	else
402	{	550	{
403	slog (L_ERR,	551	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
405	revents);	553	revents);
406	exit (1);	554	exit (EXIT_FAILURE);
407	}	555	}
408	}	556	}
409		557
410	void	558	#if ENABLE_ICMP
		559	inline void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
412	{	561	{
413	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
414	{	563	{
415	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	565	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
418	int len;	567	int len;
…		…
423		572
424	if (len > 0)	573	if (len > 0)
425	{	574	{
426	pkt->len = len;	575	pkt->len = len;
427		576
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		578
430	if (hdr->type == ::conf.icmp_type	579	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	580	&& hdr->code == 255)
432	{	581	{
433	// 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
…		…
438	}	587	}
439	}	588	}
440	else	589	else
441	{	590	{
442	// probably ECONNRESET or somesuch	591	// probably ECONNRESET or somesuch
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
444	}	593	}
445		594
446	delete pkt;	595	delete pkt;
447	}	596	}
448	else if (revents & POLLHUP)
449	{
450	// this cannot ;) happen on udp sockets
451	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
452	exit (1);
453	}
454	else	597	else
455	{	598	{
456	slog (L_ERR,	599	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, exiting.\n"),
458	revents);	601	revents);
459	exit (1);	602	exit (EXIT_FAILURE);
460	}	603	}
461	}	604	}
		605	#endif
462		606
463	void	607	inline void
464	vpn::udpv4_ev (io_watcher &w, short revents)	608	vpn::udpv4_ev (ev::io &w, int revents)
465	{	609	{
466	if (revents & (POLLIN \| POLLERR))	610	if (revents & EV_READ)
467	{	611	{
468	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	613	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
471	int len;	615	int len;
…		…
481	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
482	}	626	}
483	else	627	else
484	{	628	{
485	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
486	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));
487	}	631	}
488		632
489	delete pkt;	633	delete pkt;
490	}	634	}
491	else if (revents & POLLHUP)
492	{
493	// this cannot ;) happen on udp sockets
494	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
495	exit (1);
496	}
497	else	635	else
498	{	636	{
499	slog (L_ERR,	637	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
501	revents);	639	revents);
502	exit (1);	640	exit (EXIT_FAILURE);
503	}	641	}
504	}	642	}
505		643
506	void	644	inline void
507	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
508	{	646	{
509	if (revents & POLLIN)	647	if (revents & EV_READ)
510	{	648	{
511	/* process data */	649	/* process data */
512	tap_packet *pkt;	650	tap_packet *pkt;
513		651
514	pkt = tap->recv ();	652	pkt = tap->recv ();
515		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
516	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
518		661
519	if (src != THISNODE->id)	662	if (src != THISNODE->id)
520	{
521	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
522	exit (1);
523	}
524
525	if (dst == THISNODE->id)
526	{
527	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
528	exit (1);
529	}
530
531	if (dst > conns.size ())
532	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
533	else
534	{
535	if (dst)
536	{	663	{
537	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	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);
541	else	676	else
542	{
543	// broadcast, first check router, then self, then english
544	connection *router = find_router ();
545
546	if (router)
547	router->inject_data_packet (pkt, true);	677	inject_data_packet (pkt, dst);
548	else
549	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
550	if ((*c)->conf != THISNODE)
551	(*c)->inject_data_packet (pkt);
552	}
553	}	678	}
554		679
555	delete pkt;	680	delete pkt;
556	}
557	else if (revents & (POLLHUP \| POLLERR))
558	{
559	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
560	exit (1);
561	}	681	}
562	else	682	else
563	abort ();	683	abort ();
564	}	684	}
565		685
566	void	686	inline void
567	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
568	{	688	{
569	if (events)	689	if (events)
570	{	690	{
571	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
572	{	692	{
573	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
574		694
575	shutdown_all ();	695	shutdown_all ();
576
577	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
580		698	exit (EXIT_SUCCESS);
581	exit (0);
582	}	699	}
583		700
584	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
585	{	702	{
586	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
587		704
588	reconnect_all ();	705	reconnect_all ();
589	}	706	}
590		707
591	events = 0;	708	events = 0;
592	}	709	}
593
594	w.at = TSTAMP_CANCEL;
595	}	710	}
596		711
597	void	712	void
598	vpn::shutdown_all ()	713	vpn::shutdown_all ()
599	{	714	{
…		…
609		724
610	conns.clear ();	725	conns.clear ();
611		726
612	connection_init ();	727	connection_init ();
613		728
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
615	i != conf.nodes.end (); ++i)	730	conns.push_back (new connection (this, *i));
616	{
617	connection *conn = new connection (this);
618		731
619	conn->conf = *i;	732	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
620	conns.push_back (conn);
621
622	conn->establish_connection ();	733	(*c)->establish_connection ();
623	}
624	}	734	}
625		735
626	connection *vpn::find_router ()	736	bool vpn::can_direct (conf_node src, conf_node dst) const
627	{	737	{
628	u32 prio = 0;	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	{
629	connection *router = 0;	749	connection *router = 0;
630		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	{
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	806	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	807	{
633	connection c = i;	808	connection o = i;
634		809
635	if (c->conf->routerprio > prio	810	if (!o->is_direct
636	&& c->connectmode == conf_node::C_ALWAYS	811	&& o->si.valid ()
637	&& c->conf != THISNODE	812	&& c->si != o->si
638	&& c->ictx && c->octx)	813	&& c == find_router_for (o))
639	{
640	prio = c->conf->routerprio;
641	router = c;
642	}	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	}
643	}	819	}
644
645	return router;
646	}	820	}
647		821
648	void vpn::send_connect_request (int id)	822	void vpn::send_connect_request (connection *c)
649	{	823	{
650	connection *c = find_router ();	824	connection *r = find_router_for (c);
651		825
652	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);
653	c->send_connect_request (id);	830	r->send_connect_request (c->conf->id);
		831	}
654	else	832	else
655	// no router found, aggressively connect to all routers	833	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	834	c->conf->nodename);
657	if ((*i)->conf->routerprio)
658	(*i)->establish_connection ();
659	}	835	}
660		836
661	void	837	void
662	connection::dump_status ()	838	connection::dump_status ()
663	{	839	{
664	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	840	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
665	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	841	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
666	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	842	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
667	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"),
668	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	844	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
669	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
670	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
671	}	845	}
672		846
673	void	847	void
674	vpn::dump_status ()	848	vpn::dump_status ()
675	{	849	{
676	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	850	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
677		851
678	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	852	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
679	(*c)->dump_status ();	853	(*c)->dump_status ();
680		854
681	slog (L_NOTICE, _("END status dump"));	855	slog (L_NOTICE, _("END status dump"));
682	}	856	}
683		857
684	vpn::vpn (void)	858	vpn::vpn (void)
		859	{
685	: event (this, &vpn::event_cb)	860	event .set<vpn, &vpn::event_cb > (this);
686	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	861	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
687	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	862	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
688	#if ENABLE_TCP	863	#if ENABLE_TCP
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	864	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
690	#endif	865	#endif
691	#if ENABLE_ICMP	866	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	867	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
693	#endif	868	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	869	#if ENABLE_DNS
695	{	870	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		871	#endif
		872	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
696	}	873	}
697		874
698	vpn::~vpn ()	875	vpn::~vpn ()
699	{	876	{
700	}	877	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs. Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC