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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <errno.h>	43	#include <errno.h>
32	#include <time.h>	44	#include <time.h>
33	#include <unistd.h>	45	#include <unistd.h>
34	#include <arpa/inet.h>	46	#include <fcntl.h>
35	#include <netinet/in.h>	47	#include <sys/socket.h>
36	#include <netinet/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	int success = 0;
		128
		129	ipv4_tos = -1;
77	ipv4_fd = -1;	130	ipv4_fd = -1;
78		131
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	133	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		135
83	if (ipv4_fd < 0)	136	if (ipv4_fd < 0)
84	return -1;	137	return -1;
85		138
86	#ifdef IP_MTU_DISCOVER	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		141
		142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
88	// 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
89	// fragment for me sometimes.	145	// fragment for me sometimes.
90	{	146	{
91	int oval = IP_PMTUDISC_DONT;	147	int oval = IP_PMTUDISC_DONT;
95		151
96	sockinfo si (THISNODE, PROT_IPv4);	152	sockinfo si (THISNODE, PROT_IPv4);
97		153
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	154	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	155	{
100	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));
101	exit (1);	157	exit (EXIT_FAILURE);
102	}	158	}
103		159
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
105	}	162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
106		165
		166	udpv4_tos = -1;
107	udpv4_fd = -1;	167	udpv4_fd = -1;
108		168
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	170	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		172
113	if (udpv4_fd < 0)	173	if (udpv4_fd < 0)
114	return -1;	174	return -1;
115		175
		176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
		178
116	// standard daemon practise...	179	// standard daemon practise...
117	{	180	{
118	int oval = 1;	181	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	183	}
121		184
122	#ifdef IP_MTU_DISCOVER	185	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	186	// this I really consider a linux bug. I am neither connected
124	// 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
125	// fragment for me sometimes.	188	// fragment for me sometimes.
126	{	189	{
127	int oval = IP_PMTUDISC_DONT;	190	int oval = IP_PMTUDISC_DONT;
…		…
131		194
132	sockinfo si (THISNODE, PROT_UDPv4);	195	sockinfo si (THISNODE, PROT_UDPv4);
133		196
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	197	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	198	{
136	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));
137	exit (1);	200	exit (EXIT_FAILURE);
138	}	201	}
139		202
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	203	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		204	++success;
141	}	205	}
		206	else
		207	THISNODE->protocols &= ~PROT_UDPv4;
142		208
		209	icmpv4_tos = -1;
143	icmpv4_fd = -1;	210	icmpv4_fd = -1;
144		211
145	#if ENABLE_ICMP	212	#if ENABLE_ICMP
146	if (THISNODE->protocols & PROT_ICMPv4)	213	if (THISNODE->protocols & PROT_ICMPv4)
147	{	214	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	215	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		216
150	if (icmpv4_fd < 0)	217	if (icmpv4_fd < 0)
151	return -1;	218	return -1;
		219
		220	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		221	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
152		222
153	#ifdef ICMP_FILTER	223	#ifdef ICMP_FILTER
154	{	224	{
155	icmp_filter oval;	225	icmp_filter oval;
156	oval.data = 0xffffffff;	226	oval.data = 0xffffffff;
…		…
159		229
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	230	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	231	}
162	#endif	232	#endif
163		233
164	#ifdef IP_MTU_DISCOVER	234	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	235	// this I really consider a linux bug. I am neither connected
166	// 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
167	// fragment for me sometimes.	237	// fragment for me sometimes.
168	{	238	{
169	int oval = IP_PMTUDISC_DONT;	239	int oval = IP_PMTUDISC_DONT;
170	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	240	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171	}	241	}
172	#endif	242	#endif
173		243
174	sockinfo si (THISNODE, PROT_ICMPv4);	244	sockinfo si (THISNODE, PROT_ICMPv4);
175		245
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	246	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	247	{
178	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));
179	exit (1);	249	exit (EXIT_FAILURE);
180	}	250	}
181		251
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
183	}	254	}
184	#endif	255	#endif
185		256
186	tcpv4_fd = -1;	257	tcpv4_fd = -1;
187		258
…		…
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	262	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		263
193	if (tcpv4_fd < 0)	264	if (tcpv4_fd < 0)
194	return -1;	265	return -1;
195		266
		267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		269
196	// standard daemon practise...	270	// standard daemon practise...
197	{	271	{
198	int oval = 1;	272	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
200	}	274	}
201		275
202	sockinfo si (THISNODE, PROT_TCPv4);	276	sockinfo si (THISNODE, PROT_TCPv4);
203		277
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	279	{
206	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));
207	exit (1);	281	exit (EXIT_FAILURE);
208	}	282	}
209		283
210	if (listen (tcpv4_fd, 5))	284	if (listen (tcpv4_fd, 5))
211	{	285	{
212	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));
213	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);
214	}	320	}
215
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
217	}
218	#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	/////////////////////////////////////////////////////////////////////////////
219		355
220	tap = new tap_device ();	356	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
222	{	358	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
224	exit (1);	360	exit (EXIT_FAILURE);
225	}	361	}
226		362
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
228		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
229	tap_ev_watcher.start (tap->fd, POLLIN);	383	tap_ev_watcher.start (tap->fd, EV_READ);
230
231	reconnect_all ();
232		384
233	return 0;	385	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	}	386	}
263		387
264	bool	388	bool
265	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)
266	{	390	{
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	391	set_tos (ipv4_fd, ipv4_tos, tos);
268	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 ());
269		393
270	return true;	394	return true;
271	}	395	}
272		396
…		…
291	sum += (sum >> 16); // carry	415	sum += (sum >> 16); // carry
292		416
293	return ~sum;	417	return ~sum;
294	}	418	}
295		419
		420	#if ENABLE_ICMP
296	bool	421	bool
297	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)
298	{	423	{
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
300
301	pkt->unshift_hdr (4);	424	pkt->unshift_hdr (4);
302		425
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	428	hdr->code = 255;
306	hdr->checksum = 0;	429	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
309	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 ());
310		434
311	return true;	435	return true;
312	}	436	}
		437	#endif
313		438
314	bool	439	bool
315	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)
316	{	441	{
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	442	set_tos (udpv4_fd, udpv4_tos, tos);
318	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 ());
319		444
320	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	}
321	}	465	}
322		466
323	void	467	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	469	{
326	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
327	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
328		472
329	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."),
330	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
331		475
332	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
333	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
334	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
335	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)."),
336	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
337	else if (dst > conns.size ())	481	else if (dst > conns.size ())
338	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)."),
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	484	else
341	{	485	{
342	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
343		487
344	if (dst == 0 && !THISNODE->routerprio)	488	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
346	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
348	{	492	{
349	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	496	else
353	slog (L_WARN,	497	slog (L_WARN,
354	_("%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?)."),
355	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
356	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
357	}	501	}
358	else	502	else
359	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
360	}	504	}
361	}	505	}
362		506
363	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
364	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
365	{	539	{
366	if (revents & (POLLIN \| POLLERR))	540	if (revents & EV_READ)
367	{	541	{
368	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	543	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
371	int len;	545	int len;
…		…
376		550
377	if (len > 0)	551	if (len > 0)
378	{	552	{
379	pkt->len = len;	553	pkt->len = len;
380		554
381	// 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
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
384		557
385	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
386	}	559	}
387	else	560	else
388	{	561	{
389	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
391	}	564	}
392		565
393	delete pkt;	566	delete pkt;
394	}	567	}
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	568	else
402	{	569	{
403	slog (L_ERR,	570	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
405	revents);	572	revents);
406	exit (1);	573	exit (EXIT_FAILURE);
407	}	574	}
408	}	575	}
409		576
410	void	577	#if ENABLE_ICMP
		578	inline void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
412	{	580	{
413	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
414	{	582	{
415	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	584	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
418	int len;	586	int len;
…		…
423		591
424	if (len > 0)	592	if (len > 0)
425	{	593	{
426	pkt->len = len;	594	pkt->len = len;
427		595
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	596	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		597
430	if (hdr->type == ::conf.icmp_type	598	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	599	&& hdr->code == 255)
432	{	600	{
433	// 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
…		…
438	}	606	}
439	}	607	}
440	else	608	else
441	{	609	{
442	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
444	}	612	}
445		613
446	delete pkt;	614	delete pkt;
447	}	615	}
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	616	else
455	{	617	{
456	slog (L_ERR,	618	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
458	revents);	620	revents);
459	exit (1);	621	exit (EXIT_FAILURE);
460	}	622	}
461	}	623	}
		624	#endif
462		625
463	void	626	inline void
464	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
465	{	628	{
466	if (revents & (POLLIN \| POLLERR))	629	if (revents & EV_READ)
467	{	630	{
468	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	632	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
471	int len;	634	int len;
…		…
481	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
482	}	645	}
483	else	646	else
484	{	647	{
485	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
486	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));
487	}	650	}
488		651
489	delete pkt;	652	delete pkt;
490	}	653	}
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	654	else
498	{	655	{
499	slog (L_ERR,	656	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
501	revents);	658	revents);
502	exit (1);	659	exit (EXIT_FAILURE);
503	}	660	}
504	}	661	}
505		662
506	void	663	inline void
507	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
508	{	665	{
509	if (revents & POLLIN)	666	if (revents & EV_READ)
510	{	667	{
511	/* process data */	668	/* process data */
512	tap_packet *pkt;	669	tap_packet *pkt;
513		670
514	pkt = tap->recv ();	671	pkt = tap->recv ();
515		672
		673	if (!pkt)
		674	return;
		675
		676	if (pkt->len > 14)
		677	{
516	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
518		680
519	if (src != THISNODE->id)	681	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	{	682	{
537	// unicast	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	684	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	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);
541	else	695	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);	696	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	}	697	}
554		698
555	delete pkt;	699	delete pkt;
556	}	700	}
557	else if (revents & (POLLHUP \| POLLERR))
558	{
559	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
560	exit (1);
561	}
562	else	701	else
563	abort ();	702	abort ();
564	}	703	}
565		704
566	void	705	inline void
567	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
568	{	707	{
569	if (events)	708	if (events)
570	{	709	{
571	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
572	{	711	{
573	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
574		713
575	shutdown_all ();	714	shutdown_all ();
576
577	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
580		717	exit (EXIT_SUCCESS);
581	exit (0);
582	}	718	}
583		719
584	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
585	{	721	{
586	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
587		723
588	reconnect_all ();	724	reconnect_all ();
589	}	725	}
590		726
591	events = 0;	727	events = 0;
592	}	728	}
593
594	w.at = TSTAMP_CANCEL;
595	}	729	}
596		730
597	void	731	void
598	vpn::shutdown_all ()	732	vpn::shutdown_all ()
599	{	733	{
…		…
609		743
610	conns.clear ();	744	conns.clear ();
611		745
612	connection_init ();	746	connection_init ();
613		747
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
615	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
616	{
617	connection *conn = new connection (this);
618		750
619	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
620	conns.push_back (conn);
621
622	conn->establish_connection ();	752	(*c)->establish_connection ();
623	}
624	}	753	}
625		754
626	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
627	{	756	{
628	u32 prio = 0;	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	{
629	connection *router = 0;	768	connection *router = 0;
630		769
		770	// first try to find a router with a direct connection
		771	{
		772	u32 prio = 1;
		773
		774	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		775	{
		776	connection c = i;
		777
		778	if (c->conf->routerprio > prio
		779	&& c->conf != THISNODE
		780	&& c != dst
		781	&& can_direct (c->conf, dst->conf))
		782	{
		783	if (c->ictx && c->octx)
		784	{
		785	prio = c->conf->routerprio;
		786	router = c;
		787	}
		788	else
		789	c->establish_connection ();
		790	}
		791	}
		792	}
		793
		794	if (router)
		795	return router;
		796
		797	// second try find the router with the highest priority higher than ours
		798	{
		799	u32 prio = 1;
		800
		801	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		802	{
		803	connection c = i;
		804
		805	if (c->conf->routerprio > prio
		806	&& c->conf->routerprio > THISNODE->routerprio
		807	&& c != dst
		808	&& c->conf != THISNODE)
		809	{
		810	if (c->ictx && c->octx)
		811	{
		812	prio = c->conf->routerprio;
		813	router = c;
		814	}
		815	else
		816	c->establish_connection ();
		817	}
		818	}
		819	}
		820	return router;
		821	}
		822
		823	void vpn::connection_established (connection *c)
		824	{
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	826	{
633	connection c = i;	827	connection o = i;
634		828
635	if (c->conf->routerprio > prio	829	if (!o->is_direct
636	&& c->connectmode == conf_node::C_ALWAYS	830	&& o->si.valid ()
637	&& c->conf != THISNODE	831	&& c->si != o->si
638	&& c->ictx && c->octx)	832	&& c == find_router_for (o))
639	{
640	prio = c->conf->routerprio;
641	router = c;
642	}	833	{
		834	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		835	o->conf->nodename, c->conf->nodename);
		836	o->rekey ();
		837	}
643	}	838	}
644
645	return router;
646	}	839	}
647		840
648	void vpn::send_connect_request (int id)	841	void vpn::send_connect_request (connection *c)
649	{	842	{
650	connection *c = find_router ();	843	connection *r = find_router_for (c);
651		844
652	if (c)	845	if (r)
		846	{
		847	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		848	c->conf->nodename, r->conf->nodename);
653	c->send_connect_request (id);	849	r->send_connect_request (c->conf->id);
		850	}
654	else	851	else
655	// no router found, aggressively connect to all routers	852	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)	853	c->conf->nodename);
657	if ((*i)->conf->routerprio)
658	(*i)->establish_connection ();
659	}	854	}
660		855
661	void	856	void
662	connection::dump_status ()	857	connection::dump_status ()
663	{	858	{
664	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
665	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
666	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
667	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	862	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
668	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(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	}	864	}
672		865
673	void	866	void
674	vpn::dump_status ()	867	vpn::dump_status ()
675	{	868	{
676	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
677		870
678	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
679	(*c)->dump_status ();	872	(*c)->dump_status ();
680		873
681	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
682	}	875	}
683		876
684	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
685	: event (this, &vpn::event_cb)	879	event .set<vpn, &vpn::event_cb > (this);
686	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
687	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
688	#if ENABLE_TCP	882	#if ENABLE_TCP
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
690	#endif	884	#endif
691	#if ENABLE_ICMP	885	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
693	#endif	887	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	888	#if ENABLE_DNS
695	{	889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		890	#endif
		891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
696	}	892	}
697		893
698	vpn::~vpn ()	894	vpn::~vpn ()
699	{	895	{
700	}	896	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs. Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC