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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.14 by pcg, Tue Oct 14 03:22:09 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 <fcntl.h>	46	#include <fcntl.h>
35	#include <sys/socket.h>	47	#include <sys/socket.h>
36	#include <netinet/in.h>	48
37	#include <arpa/inet.h>	49	#include "netcompat.h"
38	#include <net/if.h>
39	#ifdef HAVE_NETINET_IN_SYSTM_H
40	# include <netinet/in_systm.h>
41	#endif
42	#ifdef HAVE_NETINET_IP_H
43	# include <netinet/ip.h>
44	#endif
45	#ifdef HAVE_NETINET_TCP_H
46	# include <netinet/tcp.h>
47	#endif
48	#if ENABLE_ICMP
49	# include <netinet/ip_icmp.h>
50	#endif
51		50
52	#include "pidfile.h"	51	#include "pidfile.h"
53		52
54	#include "connection.h"	53	#include "connection.h"
55	#include "util.h"	54	#include "util.h"
56	#include "vpn.h"	55	#include "vpn.h"
57		56
58	#if !defined(SOL_IP) && defined(IPPROTO_IP)	57	vpn network; // THE vpn (bad design...)
59	# define SOL_IP IPPROTO_IP
60	#endif
61		58
62	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
63		60
64	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 ()
65	{	75	{
66	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
67	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
72		82
73	char *env;	83	char *env;
74	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
75	putenv (env);
76	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
77	putenv (env);
78	asprintf (&env, "NODEID=%d", THISNODE->id);
79	putenv (env);
80	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
81	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
82	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
83	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
84	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
85	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
86	THISNODE->id & 0xff);
87	putenv (env);
88		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,
89	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;
90	}	122	}
91		123
92	int	124	int
93	vpn::setup ()	125	vpn::setup ()
94	{	126	{
		127	int success = 0;
		128
		129	ipv4_tos = -1;
95	ipv4_fd = -1;	130	ipv4_fd = -1;
96		131
97	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
98	{	133	{
99	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
100		135
101	if (ipv4_fd < 0)	136	if (ipv4_fd < 0)
102	return -1;	137	return -1;
103		138
104	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
105		141
106	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
107	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
108	// 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
109	// fragment for me sometimes.	145	// fragment for me sometimes.
115		151
116	sockinfo si (THISNODE, PROT_IPv4);	152	sockinfo si (THISNODE, PROT_IPv4);
117		153
118	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	154	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
119	{	155	{
120	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));
121	exit (1);	157	exit (EXIT_FAILURE);
122	}	158	}
123		159
124	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
125	}	162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
126		165
		166	udpv4_tos = -1;
127	udpv4_fd = -1;	167	udpv4_fd = -1;
128		168
129	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
130	{	170	{
131	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
132		172
133	if (udpv4_fd < 0)	173	if (udpv4_fd < 0)
134	return -1;	174	return -1;
135		175
136	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
137		178
138	// standard daemon practise...	179	// standard daemon practise...
139	{	180	{
140	int oval = 1;	181	int oval = 1;
141	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
153		194
154	sockinfo si (THISNODE, PROT_UDPv4);	195	sockinfo si (THISNODE, PROT_UDPv4);
155		196
156	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	197	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
157	{	198	{
158	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));
159	exit (1);	200	exit (EXIT_FAILURE);
160	}	201	}
161		202
162	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	203	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		204	++success;
163	}	205	}
		206	else
		207	THISNODE->protocols &= ~PROT_UDPv4;
164		208
		209	icmpv4_tos = -1;
165	icmpv4_fd = -1;	210	icmpv4_fd = -1;
166		211
167	#if ENABLE_ICMP	212	#if ENABLE_ICMP
168	if (THISNODE->protocols & PROT_ICMPv4)	213	if (THISNODE->protocols & PROT_ICMPv4)
169	{	214	{
170	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	215	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
171		216
172	if (icmpv4_fd < 0)	217	if (icmpv4_fd < 0)
173	return -1;	218	return -1;
174		219
175	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	220	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		221	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
176		222
177	#ifdef ICMP_FILTER	223	#ifdef ICMP_FILTER
178	{	224	{
179	icmp_filter oval;	225	icmp_filter oval;
180	oval.data = 0xffffffff;	226	oval.data = 0xffffffff;
…		…
189	// this I really consider a linux bug. I am neither connected	235	// this I really consider a linux bug. I am neither connected
190	// 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
191	// fragment for me sometimes.	237	// fragment for me sometimes.
192	{	238	{
193	int oval = IP_PMTUDISC_DONT;	239	int oval = IP_PMTUDISC_DONT;
194	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	240	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
195	}	241	}
196	#endif	242	#endif
197		243
198	sockinfo si (THISNODE, PROT_ICMPv4);	244	sockinfo si (THISNODE, PROT_ICMPv4);
199		245
200	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	246	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
201	{	247	{
202	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));
203	exit (1);	249	exit (EXIT_FAILURE);
204	}	250	}
205		251
206	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
207	}	254	}
208	#endif	255	#endif
209		256
210	tcpv4_fd = -1;	257	tcpv4_fd = -1;
211		258
…		…
216		263
217	if (tcpv4_fd < 0)	264	if (tcpv4_fd < 0)
218	return -1;	265	return -1;
219		266
220	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
221		269
222	// standard daemon practise...	270	// standard daemon practise...
223	{	271	{
224	int oval = 1;	272	int oval = 1;
225	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
227		275
228	sockinfo si (THISNODE, PROT_TCPv4);	276	sockinfo si (THISNODE, PROT_TCPv4);
229		277
230	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
231	{	279	{
232	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));
233	exit (1);	281	exit (EXIT_FAILURE);
234	}	282	}
235		283
236	if (listen (tcpv4_fd, 5))	284	if (listen (tcpv4_fd, 5))
237	{	285	{
238	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));
239	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);
240	}	320	}
241
242	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
243	}
244	#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	/////////////////////////////////////////////////////////////////////////////
245		355
246	tap = new tap_device ();	356	tap = new tap_device ();
247	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
248	{	358	{
249	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
250	exit (1);	360	exit (EXIT_FAILURE);
251	}	361	}
252		362
253	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
254		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
255	tap_ev_watcher.start (tap->fd, POLLIN);	383	tap_ev_watcher.start (tap->fd, EV_READ);
256
257	reconnect_all ();
258		384
259	return 0;	385	return 0;
260	}
261
262	// send a vpn packet out to other hosts
263	bool
264	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
265	{
266	switch (si.prot)
267	{
268	case PROT_IPv4:
269	return send_ipv4_packet (pkt, si, tos);
270
271	case PROT_UDPv4:
272	return send_udpv4_packet (pkt, si, tos);
273
274	#if ENABLE_TCP
275	case PROT_TCPv4:
276	return send_tcpv4_packet (pkt, si, tos);
277	#endif
278
279	#if ENABLE_ICMP
280	case PROT_ICMPv4:
281	return send_icmpv4_packet (pkt, si, tos);
282	#endif
283
284	default:
285	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
286	return false;
287	}
288	}	386	}
289		387
290	bool	388	bool
291	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)
292	{	390	{
293	#if defined(SOL_IP) && defined(IP_TOS)	391	set_tos (ipv4_fd, ipv4_tos, tos);
294	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
295	#endif
296	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 ());
297		393
298	return true;	394	return true;
299	}	395	}
300		396
…		…
320		416
321	return ~sum;	417	return ~sum;
322	}	418	}
323		419
324	#if ENABLE_ICMP	420	#if ENABLE_ICMP
325	struct icmp_header {
326	u8 type;
327	u8 code;
328	u16 checksum;
329	union {
330	struct {
331	u16 id;
332	u16 sequence;
333	} echo;
334	u32 gateway;
335	struct {
336	u16 unused;
337	u16 mtu;
338	} frag;
339	} un;
340	};
341
342	bool	421	bool
343	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)
344	{	423	{
345	#if defined(SOL_IP) && defined(IP_TOS)
346	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
347	#endif
348
349	pkt->unshift_hdr (4);	424	pkt->unshift_hdr (4);
350		425
351	icmp_header hdr = (icmp_header )&((*pkt)[0]);	426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
352	hdr->type = ::conf.icmp_type;	427	hdr->type = ::conf.icmp_type;
353	hdr->code = 255;	428	hdr->code = 255;
354	hdr->checksum = 0;	429	hdr->checksum = 0;
355	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
356		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
357	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 ());
358		434
359	return true;	435	return true;
360	}	436	}
361	#endif	437	#endif
362		438
363	bool	439	bool
364	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)
365	{	441	{
366	#if defined(SOL_IP) && defined(IP_TOS)	442	set_tos (udpv4_fd, udpv4_tos, tos);
367	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
368	#endif
369	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 ());
370		444
371	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	}
372	}	465	}
373		466
374	void	467	void
375	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
376	{	469	{
377	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
378	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
379		472
380	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."),
381	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
382		475
383	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
384	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
385	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
386	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)."),
387	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
388	else if (dst > conns.size ())	481	else if (dst > conns.size ())
389	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)."),
390	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
391	else	484	else
392	{	485	{
393	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
394		487
395	if (dst == 0)	488	if (dst == 0)
396	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
397	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
398	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
399	{	492	{
400	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
401	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
402	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
403	else	496	else
404	slog (L_WARN,	497	slog (L_WARN,
405	_("%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?)."),
406	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
407	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
408	}	501	}
409	else	502	else
410	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
411	}	504	}
412	}	505	}
413		506
414	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
415	vpn::ipv4_ev (io_watcher &w, short revents)	538	vpn::ipv4_ev (ev::io &w, int revents)
416	{	539	{
417	if (revents & (POLLIN \| POLLERR))	540	if (revents & EV_READ)
418	{	541	{
419	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
420	struct sockaddr_in sa;	543	struct sockaddr_in sa;
421	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
422	int len;	545	int len;
…		…
427		550
428	if (len > 0)	551	if (len > 0)
429	{	552	{
430	pkt->len = len;	553	pkt->len = len;
431		554
432	// 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
433	// this is slow, but...
434	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (IP_OVERHEAD);
435		557
436	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
437	}	559	}
438	else	560	else
439	{	561	{
440	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
441	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
442	}	564	}
443		565
444	delete pkt;	566	delete pkt;
445	}	567	}
446	else if (revents & POLLHUP)
447	{
448	// this cannot ;) happen on udp sockets
449	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
450	exit (1);
451	}
452	else	568	else
453	{	569	{
454	slog (L_ERR,	570	slog (L_ERR,
455	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
456	revents);	572	revents);
457	exit (1);	573	exit (EXIT_FAILURE);
458	}	574	}
459	}	575	}
460		576
461	#if ENABLE_ICMP	577	#if ENABLE_ICMP
462	void	578	inline void
463	vpn::icmpv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
464	{	580	{
465	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
466	{	582	{
467	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
468	struct sockaddr_in sa;	584	struct sockaddr_in sa;
469	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
470	int len;	586	int len;
…		…
490	}	606	}
491	}	607	}
492	else	608	else
493	{	609	{
494	// probably ECONNRESET or somesuch	610	// probably ECONNRESET or somesuch
495	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
496	}	612	}
497		613
498	delete pkt;	614	delete pkt;
499	}	615	}
500	else if (revents & POLLHUP)
501	{
502	// this cannot ;) happen on udp sockets
503	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
504	exit (1);
505	}
506	else	616	else
507	{	617	{
508	slog (L_ERR,	618	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
510	revents);	620	revents);
511	exit (1);	621	exit (EXIT_FAILURE);
512	}	622	}
513	}	623	}
514	#endif	624	#endif
515		625
516	void	626	inline void
517	vpn::udpv4_ev (io_watcher &w, short revents)	627	vpn::udpv4_ev (ev::io &w, int revents)
518	{	628	{
519	if (revents & (POLLIN \| POLLERR))	629	if (revents & EV_READ)
520	{	630	{
521	vpn_packet *pkt = new vpn_packet;	631	vpn_packet *pkt = new vpn_packet;
522	struct sockaddr_in sa;	632	struct sockaddr_in sa;
523	socklen_t sa_len = sizeof (sa);	633	socklen_t sa_len = sizeof (sa);
524	int len;	634	int len;
…		…
534	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
535	}	645	}
536	else	646	else
537	{	647	{
538	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
539	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));
540	}	650	}
541		651
542	delete pkt;	652	delete pkt;
543	}	653	}
544	else if (revents & POLLHUP)
545	{
546	// this cannot ;) happen on udp sockets
547	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
548	exit (1);
549	}
550	else	654	else
551	{	655	{
552	slog (L_ERR,	656	slog (L_ERR,
553	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
554	revents);	658	revents);
555	exit (1);	659	exit (EXIT_FAILURE);
556	}	660	}
557	}	661	}
558		662
559	void	663	inline void
560	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
561	{	665	{
562	if (revents & POLLIN)	666	if (revents & EV_READ)
563	{	667	{
564	/* process data */	668	/* process data */
565	tap_packet *pkt;	669	tap_packet *pkt;
566		670
567	pkt = tap->recv ();	671	pkt = tap->recv ();
568		672
		673	if (!pkt)
		674	return;
		675
		676	if (pkt->len > 14)
		677	{
569	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
570	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
571		680
572	if (src != THISNODE->id)	681	if (src != THISNODE->id)
573	{
574	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
575	exit (1);
576	}
577
578	if (dst == THISNODE->id)
579	{
580	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
581	exit (1);
582	}
583
584	if (dst > conns.size ())
585	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
586	else
587	{
588	if (dst)
589	{	682	{
590	// unicast	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
591	if (dst != THISNODE->id)	684	exit (EXIT_FAILURE);
592	conns[dst - 1]->inject_data_packet (pkt);
593	}	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);
594	else	695	else
595	{
596	// broadcast, this is ugly, but due to the security policy
597	// we have to connect to all hosts...
598	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
599	if ((*c)->conf != THISNODE)
600	(*c)->inject_data_packet (pkt);	696	inject_data_packet (pkt, dst);
601	}
602	}	697	}
603		698
604	delete pkt;	699	delete pkt;
605	}	700	}
606	else if (revents & (POLLHUP \| POLLERR))
607	{
608	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
609	exit (1);
610	}
611	else	701	else
612	abort ();	702	abort ();
613	}	703	}
614		704
615	void	705	inline void
616	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
617	{	707	{
618	if (events)	708	if (events)
619	{	709	{
620	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
621	{	711	{
622	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
623		713
624	shutdown_all ();	714	shutdown_all ();
625
626	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
627
628	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
629		717	exit (EXIT_SUCCESS);
630	exit (0);
631	}	718	}
632		719
633	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
634	{	721	{
635	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
636		723
637	reconnect_all ();	724	reconnect_all ();
638	}	725	}
639		726
640	events = 0;	727	events = 0;
641	}	728	}
642
643	w.at = TSTAMP_CANCEL;
644	}	729	}
645		730
646	void	731	void
647	vpn::shutdown_all ()	732	vpn::shutdown_all ()
648	{	733	{
…		…
658		743
659	conns.clear ();	744	conns.clear ();
660		745
661	connection_init ();	746	connection_init ();
662		747
663	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
664	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
665	{
666	connection *conn = new connection (this);
667		750
668	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
669	conns.push_back (conn);
670
671	conn->establish_connection ();	752	(*c)->establish_connection ();
672	}
673	}	753	}
674		754
675	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
676	{	756	{
677	u32 prio = 1;	757	return src != dst
		758	&& src->may_direct (dst)
		759	&& dst->may_direct (src)
		760	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		761	\|\| (src->protocols & dst->connectable_protocols ()));
		762	}
		763
		764	// only works for indirect and routed connections: find a router
		765	// from THISNODE to dst
		766	connection vpn::find_router_for (const connection dst)
		767	{
678	connection *router = 0;	768	connection *router = 0;
679		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	{
680	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
681	{	826	{
682	connection c = i;	827	connection o = i;
683		828
684	if (c->conf->routerprio > prio	829	if (!o->is_direct
685	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
686	&& c->ictx && c->octx	831	&& c->si != o->si
687	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
688	{
689	prio = c->conf->routerprio;
690	router = c;
691	}	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	}
692	}	838	}
693
694	return router;
695	}	839	}
696		840
697	void vpn::send_connect_request (int id)	841	void vpn::send_connect_request (connection *c)
698	{	842	{
699	connection *c = find_router ();	843	connection *r = find_router_for (c);
700		844
701	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);
702	c->send_connect_request (id);	849	r->send_connect_request (c->conf->id);
		850	}
703	else	851	else
704	// no router found, aggressively connect to all routers	852	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
705	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	853	c->conf->nodename);
706	if ((i)->conf->routerprio && (i)->conf != THISNODE)
707	(*i)->establish_connection ();
708	}	854	}
709		855
710	void	856	void
711	connection::dump_status ()	857	connection::dump_status ()
712	{	858	{
713	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
714	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
715	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
716	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"),
717	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
718	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
719	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
720	}	864	}
721		865
722	void	866	void
723	vpn::dump_status ()	867	vpn::dump_status ()
724	{	868	{
725	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
726		870
727	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
728	(*c)->dump_status ();	872	(*c)->dump_status ();
729		873
730	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
731	}	875	}
732		876
733	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
734	: event (this, &vpn::event_cb)	879	event .set<vpn, &vpn::event_cb > (this);
735	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
736	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
737	#if ENABLE_TCP	882	#if ENABLE_TCP
738	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
739	#endif	884	#endif
740	#if ENABLE_ICMP	885	#if ENABLE_ICMP
741	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
742	#endif	887	#endif
743	, tap_ev_watcher (this, &vpn::tap_ev)	888	#if ENABLE_DNS
744	{	889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		890	#endif
		891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
745	}	892	}
746		893
747	vpn::~vpn ()	894	vpn::~vpn ()
748	{	895	{
749	}	896	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.14 by pcg, Tue Oct 14 03:22:09 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 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC