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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008,2010,2011 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>
40		52
41	#include "connection.h"	53	#include "connection.h"
42	#include "util.h"	54	#include "util.h"
43	#include "vpn.h"	55	#include "vpn.h"
44		56
		57	vpn network; // THE vpn (bad design...)
		58
45	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
46		60
47	const char *vpn::script_if_up ()	61	static void inline
		62	set_tos (int fd, int &tos_prev, int tos)
		63	{
		64	#if defined(SOL_IP) && defined(IP_TOS)
		65	if (tos_prev == tos)
		66	return;
		67
		68	tos_prev = tos;
		69	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		70	#endif
		71	}
		72
		73	void
		74	vpn::script_init_env ()
48	{	75	{
49	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
50	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
51	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
52	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55		82
56	char *env;	83	char *env;
57	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
60	putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id);
62	putenv (env);
63	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69	THISNODE->id & 0xff);
70	putenv (env);
71		91
		92	conns [THISNODE->id - 1]->script_init_env ("");
		93
		94	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		95	{
		96	char ext[16];
		97	snprintf (ext, 16, "_%d", (*c)->conf->id);
		98	(*c)->script_init_env (ext);
		99	}
		100	}
		101
		102	inline const char *
		103	vpn::script_if_init ()
		104	{
		105	script_init_env ();
		106
		107	return tap->if_up ();
		108	}
		109
		110	inline const char *
		111	vpn::script_if_up ()
		112	{
		113	script_init_env ();
		114
		115	char *filename;
		116	asprintf (&filename,
		117	"%s/%s",
		118	confbase,
72	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	119	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		120
		121	return filename;
		122	}
		123
		124	int
		125	vpn::setup_socket (u8 prot, int family, int type, int proto)
		126	{
		127	int fd = socket (family, type, proto);
		128
		129	if (fd < 0)
		130	{
		131	slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
		132	return fd;
		133	}
		134
		135	fcntl (fd, F_SETFL, O_NONBLOCK);
		136	fcntl (fd, F_SETFD, FD_CLOEXEC);
		137
		138	#ifdef SO_MARK
		139	if (::conf.nfmark)
		140	if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark))
		141	slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno));
		142	#endif
		143
		144	return fd;
73	}	145	}
74		146
75	int	147	int
76	vpn::setup ()	148	vpn::setup ()
77	{	149	{
		150	int success = 0;
		151
		152	ipv4_tos = -1;
78	ipv4_fd = -1;	153	ipv4_fd = -1;
79		154
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	156	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
83		158
84	if (ipv4_fd < 0)	159	if (ipv4_fd < 0)
85	return -1;	160	return -1;
86
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88		161
89	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
91	// nor do I fragment myself. Linux still sets DF and doesn't	164	// nor do I fragment myself. Linux still sets DF and doesn't
92	// fragment for me sometimes.	165	// fragment for me sometimes.
…		…
98		171
99	sockinfo si (THISNODE, PROT_IPv4);	172	sockinfo si (THISNODE, PROT_IPv4);
100		173
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	175	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	176	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
104	exit (1);	177	return -1;
105	}	178	}
106		179
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
108	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
109		185
		186	udpv4_tos = -1;
110	udpv4_fd = -1;	187	udpv4_fd = -1;
111		188
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	190	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		192
116	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
117	return -1;	194	return -1;
118
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
120		195
121	// standard daemon practise...	196	// standard daemon practise...
122	{	197	{
123	int oval = 1;	198	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
136		211
137	sockinfo si (THISNODE, PROT_UDPv4);	212	sockinfo si (THISNODE, PROT_UDPv4);
138		213
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	215	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
142	exit (1);	217	return -1;
143	}	218	}
144		219
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
146	}	222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
147		225
		226	icmpv4_tos = -1;
148	icmpv4_fd = -1;	227	icmpv4_fd = -1;
149		228
150	#if ENABLE_ICMP	229	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	230	if (THISNODE->protocols & PROT_ICMPv4)
152	{	231	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		233
155	if (icmpv4_fd < 0)	234	if (icmpv4_fd < 0)
156	return -1;	235	return -1;
157
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
159		236
160	#ifdef ICMP_FILTER	237	#ifdef ICMP_FILTER
161	{	238	{
162	icmp_filter oval;	239	icmp_filter oval;
163	oval.data = 0xffffffff;	240	oval.data = 0xffffffff;
…		…
172	// this I really consider a linux bug. I am neither connected	249	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	250	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	251	// fragment for me sometimes.
175	{	252	{
176	int oval = IP_PMTUDISC_DONT;	253	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	255	}
179	#endif	256	#endif
180		257
181	sockinfo si (THISNODE, PROT_ICMPv4);	258	sockinfo si (THISNODE, PROT_ICMPv4);
182		259
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	261	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	262	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
186	exit (1);	263	return -1;
187	}	264	}
188		265
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
190	}	268	}
191	#endif	269	#endif
192		270
193	tcpv4_fd = -1;	271	tcpv4_fd = -1;
194		272
195	#if ENABLE_TCP	273	#if ENABLE_TCP
196	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
197	{	275	{
198	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
199		277
200	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
201	return -1;	279	return -1;
202		280
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
204
205	// standard daemon practise...	281	// standard daemon practise...
206	{	282	{
207	int oval = 1;	283	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	284	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
209	}	285	}
210		286
211	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
212		288
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	290	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	291	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
216	exit (1);	292	return -1;
217	}	293	}
218		294
219	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
220	{	296	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	297	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
222	exit (1);	298	return -1;
		299	}
		300
		301	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		302	++success;
		303	}
		304	else
		305	THISNODE->protocols &= ~PROT_TCPv4;
		306	#endif
		307
		308	dnsv4_tos = -1;
		309	dnsv4_fd = -1;
		310
		311	#if ENABLE_DNS
		312	if (THISNODE->protocols & PROT_DNSv4)
		313	{
		314	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		315
		316	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		317
		318	if (dnsv4_fd < 0)
		319	return -1;
		320
		321	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		322	// this I really consider a linux bug. I am neither connected
		323	// nor do I fragment myself. Linux still sets DF and doesn't
		324	// fragment for me sometimes.
		325	{
		326	int oval = IP_PMTUDISC_DONT;
		327	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
223	}	328	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#endif	329	# endif
		330
		331	// standard daemon practise...
		332	{
		333	int oval = 1;
		334	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		335	}
		336
		337	sockinfo si (THISNODE->dns_hostname,
		338	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		339	PROT_DNSv4);
		340
		341	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		342	{
		343	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		344	return -1;
		345	}
		346
		347	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		348	++success;
		349	}
		350	#endif
		351
		352	/////////////////////////////////////////////////////////////////////////////
		353
		354	if (!success)
		355	{
		356	slog (L_ERR, _("no protocols enabled."));
		357	return -1;
		358	}
		359
		360	reconnect_all ();
		361
		362	/////////////////////////////////////////////////////////////////////////////
228		363
229	tap = new tap_device ();	364	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
231	{	366	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
233	exit (1);	368	return -1;
234	}	369	}
235		370
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		372
		373	run_script_cb cb;
		374	cb.set<vpn, &vpn::script_if_init> (this);
		375
		376	if (tap->if_up () &&
		377	!run_script (cb, true))
		378	{
		379	slog (L_ERR, _("interface initialization command '%s' failed."),
		380	tap->if_up ());
		381	return -1;
		382	}
		383
		384	cb.set<vpn, &vpn::script_if_up> (this);
		385	if (!run_script (cb, true))
		386	{
		387	slog (L_ERR, _("if-up command execution failed."));
		388	return -1;
		389	}
		390
238	tap_ev_watcher.start (tap->fd, POLLIN);	391	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		392
242	return 0;	393	return 0;
243	}
244
245	// send a vpn packet out to other hosts
246	bool
247	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
248	{
249	switch (si.prot)
250	{
251	case PROT_IPv4:
252	return send_ipv4_packet (pkt, si, tos);
253
254	case PROT_UDPv4:
255	return send_udpv4_packet (pkt, si, tos);
256
257	#if ENABLE_TCP
258	case PROT_TCPv4:
259	return send_tcpv4_packet (pkt, si, tos);
260	#endif
261
262	#if ENABLE_ICMP
263	case PROT_ICMPv4:
264	return send_icmpv4_packet (pkt, si, tos);
265	#endif
266
267	default:
268	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
269	return false;
270	}
271	}	394	}
272		395
273	bool	396	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	397	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	398	{
276	#if defined(SOL_IP) && defined(IP_TOS)	399	set_tos (ipv4_fd, ipv4_tos, tos);
277	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
278	#endif
279	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	400	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
280		401
281	return true;	402	return true;
282	}	403	}
283		404
…		…
306		427
307	#if ENABLE_ICMP	428	#if ENABLE_ICMP
308	bool	429	bool
309	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	430	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
310	{	431	{
311	#if defined(SOL_IP) && defined(IP_TOS)
312	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
313	#endif
314
315	pkt->unshift_hdr (4);	432	pkt->unshift_hdr (4);
316		433
317	icmp_header hdr = (icmp_header )&((*pkt)[0]);	434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
318	hdr->type = ::conf.icmp_type;	435	hdr->type = ::conf.icmp_type;
319	hdr->code = 255;	436	hdr->code = 255;
320	hdr->checksum = 0;	437	hdr->checksum = 0;
321	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
322		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
323	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	441	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
324		442
325	return true;	443	return true;
326	}	444	}
327	#endif	445	#endif
328		446
329	bool	447	bool
330	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	448	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
331	{	449	{
332	#if defined(SOL_IP) && defined(IP_TOS)	450	set_tos (udpv4_fd, udpv4_tos, tos);
333	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334	#endif
335	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	451	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
336		452
337	return true;	453	return true;
		454	}
		455
		456	void
		457	vpn::inject_data_packet (tap_packet *pkt, int dst)
		458	{
		459	if (dst)
		460	{
		461	// unicast
		462	if (dst != THISNODE->id)
		463	conns[dst - 1]->inject_data_packet (pkt);
		464	}
		465	else
		466	{
		467	// broadcast, this is ugly, but due to the security policy
		468	// we have to connect to all hosts...
		469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		470	if ((*c)->conf != THISNODE)
		471	(*c)->inject_data_packet (pkt);
		472	}
338	}	473	}
339		474
340	void	475	void
341	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
342	{	477	{
343	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
344	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
345		480
346	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	481	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
347	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
348		483
349	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
350	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
351	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
352	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	487	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
353	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
354	else if (dst > conns.size ())
355	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
356	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
357	else	489	else
358	{	490	{
359	connection *c = conns[src - 1];	491	connection *c = conns[src - 1];
360		492
361	if (dst == 0)	493	if (dst == 0)
362	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	494	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
363	c->conf->nodename, (const char *)rsi);	495	c->conf->nodename, (const char *)rsi);
364	else if (dst != 0 && dst != THISNODE->id)	496	else if (dst != THISNODE->id)
365	{	497	{
366	if (THISNODE->routerprio)	498	if (THISNODE->routerprio)
367	// the tos setting gets lost here. who cares.	499	// the tos setting gets lost here. who cares.
368	conns[dst - 1]->inject_vpn_packet (pkt);	500	conns[dst - 1]->inject_vpn_packet (pkt);
369	else	501	else
370	slog (L_WARN,	502	slog (L_WARN,
371	_("%s(%s): forwarding request (=> %s), but we are no router"),	503	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
372	c->conf->nodename, (const char *)rsi,	504	c->conf->nodename, (const char *)rsi,
373	conns[dst - 1]->conf->nodename);	505	conns[dst - 1]->conf->nodename);
374	}	506	}
375	else	507	else
376	c->recv_vpn_packet (pkt, rsi);	508	c->recv_vpn_packet (pkt, rsi);
377	}	509	}
378	}	510	}
379		511
380	void	512	bool
		513	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		514	{
		515	switch (si.prot)
		516	{
		517	case PROT_IPv4:
		518	return send_ipv4_packet (pkt, si, tos);
		519
		520	case PROT_UDPv4:
		521	return send_udpv4_packet (pkt, si, tos);
		522
		523	#if ENABLE_TCP
		524	case PROT_TCPv4:
		525	return send_tcpv4_packet (pkt, si, tos);
		526	#endif
		527	#if ENABLE_ICMP
		528	case PROT_ICMPv4:
		529	return send_icmpv4_packet (pkt, si, tos);
		530	#endif
		531	#if ENABLE_DNS
		532	case PROT_DNSv4:
		533	return send_dnsv4_packet (pkt, si, tos);
		534	#endif
		535	default:
		536	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		537	}
		538
		539	return false;
		540	}
		541
		542	inline void
381	vpn::ipv4_ev (io_watcher &w, short revents)	543	vpn::ipv4_ev (ev::io &w, int revents)
382	{	544	{
383	if (revents & (POLLIN \| POLLERR))	545	if (revents & EV_READ)
384	{	546	{
385	vpn_packet *pkt = new vpn_packet;	547	vpn_packet *pkt = new vpn_packet;
386	struct sockaddr_in sa;	548	struct sockaddr_in sa;
387	socklen_t sa_len = sizeof (sa);	549	socklen_t sa_len = sizeof (sa);
388	int len;	550	int len;
…		…
393		555
394	if (len > 0)	556	if (len > 0)
395	{	557	{
396	pkt->len = len;	558	pkt->len = len;
397		559
398	// raw sockets deliver the ipv4, but don't expect it on sends	560	// raw sockets deliver the ipv4 header, but don't expect it on sends
399	// this is slow, but...	561	pkt->skip_hdr (pkt->ipv4_hdr_len ());
400	pkt->skip_hdr (IP_OVERHEAD);
401		562
402	recv_vpn_packet (pkt, si);	563	recv_vpn_packet (pkt, si);
403	}	564	}
404	else	565	else
405	{	566	{
406	// probably ECONNRESET or somesuch	567	// probably ECONNRESET or somesuch
407	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	568	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
408	}	569	}
409		570
410	delete pkt;	571	delete pkt;
411	}	572	}
412	else if (revents & POLLHUP)
413	{
414	// this cannot ;) happen on udp sockets
415	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
416	exit (1);
417	}
418	else	573	else
419	{	574	{
420	slog (L_ERR,	575	slog (L_ERR,
421	_("FATAL: unknown revents %08x in socket, terminating\n"),	576	_("FATAL: unknown revents %08x in socket, exiting.\n"),
422	revents);	577	revents);
423	exit (1);	578	exit (EXIT_FAILURE);
424	}	579	}
425	}	580	}
426		581
427	#if ENABLE_ICMP	582	#if ENABLE_ICMP
428	void	583	inline void
429	vpn::icmpv4_ev (io_watcher &w, short revents)	584	vpn::icmpv4_ev (ev::io &w, int revents)
430	{	585	{
431	if (revents & (POLLIN \| POLLERR))	586	if (revents & EV_READ)
432	{	587	{
433	vpn_packet *pkt = new vpn_packet;	588	vpn_packet *pkt = new vpn_packet;
434	struct sockaddr_in sa;	589	struct sockaddr_in sa;
435	socklen_t sa_len = sizeof (sa);	590	socklen_t sa_len = sizeof (sa);
436	int len;	591	int len;
…		…
448	if (hdr->type == ::conf.icmp_type	603	if (hdr->type == ::conf.icmp_type
449	&& hdr->code == 255)	604	&& hdr->code == 255)
450	{	605	{
451	// raw sockets deliver the ipv4, but don't expect it on sends	606	// raw sockets deliver the ipv4, but don't expect it on sends
452	// this is slow, but...	607	// this is slow, but...
453	pkt->skip_hdr (ICMP_OVERHEAD);	608	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
454		609
455	recv_vpn_packet (pkt, si);	610	recv_vpn_packet (pkt, si);
456	}	611	}
457	}	612	}
458	else	613	else
459	{	614	{
460	// probably ECONNRESET or somesuch	615	// probably ECONNRESET or somesuch
461	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	616	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
462	}	617	}
463		618
464	delete pkt;	619	delete pkt;
465	}	620	}
466	else if (revents & POLLHUP)
467	{
468	// this cannot ;) happen on udp sockets
469	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
470	exit (1);
471	}
472	else	621	else
473	{	622	{
474	slog (L_ERR,	623	slog (L_ERR,
475	_("FATAL: unknown revents %08x in socket, terminating\n"),	624	_("FATAL: unknown revents %08x in socket, exiting.\n"),
476	revents);	625	revents);
477	exit (1);	626	exit (EXIT_FAILURE);
478	}	627	}
479	}	628	}
480	#endif	629	#endif
481		630
482	void	631	inline void
483	vpn::udpv4_ev (io_watcher &w, short revents)	632	vpn::udpv4_ev (ev::io &w, int revents)
484	{	633	{
485	if (revents & (POLLIN \| POLLERR))	634	if (revents & EV_READ)
486	{	635	{
487	vpn_packet *pkt = new vpn_packet;	636	vpn_packet *pkt = new vpn_packet;
488	struct sockaddr_in sa;	637	struct sockaddr_in sa;
489	socklen_t sa_len = sizeof (sa);	638	socklen_t sa_len = sizeof (sa);
490	int len;	639	int len;
…		…
500	recv_vpn_packet (pkt, si);	649	recv_vpn_packet (pkt, si);
501	}	650	}
502	else	651	else
503	{	652	{
504	// probably ECONNRESET or somesuch	653	// probably ECONNRESET or somesuch
505	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	654	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
506	}	655	}
507		656
508	delete pkt;	657	delete pkt;
509	}	658	}
510	else if (revents & POLLHUP)
511	{
512	// this cannot ;) happen on udp sockets
513	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
514	exit (1);
515	}
516	else	659	else
517	{	660	{
518	slog (L_ERR,	661	slog (L_ERR,
519	_("FATAL: unknown revents %08x in socket, terminating\n"),	662	_("FATAL: unknown revents %08x in socket, exiting.\n"),
520	revents);	663	revents);
521	exit (1);	664	exit (EXIT_FAILURE);
522	}	665	}
523	}	666	}
524		667
525	void	668	inline void
526	vpn::tap_ev (io_watcher &w, short revents)	669	vpn::tap_ev (ev::io &w, int revents)
527	{	670	{
528	if (revents & POLLIN)	671	if (revents & EV_READ)
529	{	672	{
530	/* process data */	673	/* process data */
531	tap_packet *pkt;	674	tap_packet *pkt;
532		675
533	pkt = tap->recv ();	676	pkt = tap->recv ();
534		677
		678	if (!pkt)
		679	return;
		680
		681	if (pkt->len > 14)
		682	{
535	int dst = mac2id (pkt->dst);	683	int dst = mac2id (pkt->dst);
536	int src = mac2id (pkt->src);	684	int src = mac2id (pkt->src);
537		685
538	if (src != THISNODE->id)	686	if (src != THISNODE->id)
539	{
540	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
541	exit (1);
542	}
543
544	if (dst == THISNODE->id)
545	{
546	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
547	exit (1);
548	}
549
550	if (dst > conns.size ())
551	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
552	else
553	{
554	if (dst)
555	{	687	{
556	// unicast	688	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
557	if (dst != THISNODE->id)	689	exit (EXIT_FAILURE);
558	conns[dst - 1]->inject_data_packet (pkt);
559	}	690	}
		691
		692	if (dst == THISNODE->id)
		693	{
		694	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		695	exit (EXIT_FAILURE);
		696	}
		697
		698	if (dst > conns.size ())
		699	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
560	else	700	else
561	{
562	// broadcast, this is ugly, but due to the security policy
563	// we have to connect to all hosts...
564	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
565	if ((*c)->conf != THISNODE)
566	(*c)->inject_data_packet (pkt);	701	inject_data_packet (pkt, dst);
567	}
568	}	702	}
569		703
570	delete pkt;	704	delete pkt;
571	}	705	}
572	else if (revents & (POLLHUP \| POLLERR))
573	{
574	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
575	exit (1);
576	}
577	else	706	else
578	abort ();	707	abort ();
579	}	708	}
580		709
581	void	710	inline void
582	vpn::event_cb (time_watcher &w)	711	vpn::event_cb (ev::timer &w, int)
583	{	712	{
584	if (events)	713	if (events)
585	{	714	{
586	if (events & EVENT_SHUTDOWN)	715	if (events & EVENT_SHUTDOWN)
587	{	716	{
588	slog (L_INFO, _("preparing shutdown..."));	717	slog (L_INFO, _("preparing shutdown..."));
589		718
590	shutdown_all ();	719	shutdown_all ();
591
592	remove_pid (pidfilename);	720	remove_pid (conf.pidfilename);
593
594	slog (L_INFO, _("terminating"));	721	slog (L_INFO, _("exiting."));
595		722	exit (EXIT_SUCCESS);
596	exit (0);
597	}	723	}
598		724
599	if (events & EVENT_RECONNECT)	725	if (events & EVENT_RECONNECT)
600	{	726	{
601	slog (L_INFO, _("forced reconnect"));	727	slog (L_INFO, _("forced reconnect."));
602		728
603	reconnect_all ();	729	reconnect_all ();
604	}	730	}
605		731
606	events = 0;	732	events = 0;
607	}	733	}
608
609	w.at = TSTAMP_CANCEL;
610	}	734	}
611		735
612	void	736	void
613	vpn::shutdown_all ()	737	vpn::shutdown_all ()
614	{	738	{
…		…
624		748
625	conns.clear ();	749	conns.clear ();
626		750
627	connection_init ();	751	connection_init ();
628		752
629	for (configuration::node_vector::iterator i = conf.nodes.begin ();	753	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
630	i != conf.nodes.end (); ++i)	754	conns.push_back (new connection (this, *i));
631	{
632	connection *conn = new connection (this);
633		755
634	conn->conf = *i;	756	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
635	conns.push_back (conn);
636
637	conn->establish_connection ();	757	(*c)->establish_connection ();
638	}
639	}	758	}
640		759
641	connection *vpn::find_router ()	760	bool
		761	vpn::can_direct (conf_node src, conf_node dst) const
642	{	762	{
643	u32 prio = 1;	763	return src != dst
		764	&& src->may_direct (dst)
		765	&& dst->may_direct (src)
		766	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		767	\|\| (src->protocols & dst->connectable_protocols ()));
		768	}
		769
		770	// only works for indirect and routed connections: find a router
		771	// from THISNODE to dst
		772	connection *
		773	vpn::find_router_for (const connection *dst)
		774	{
644	connection *router = 0;	775	connection *router = 0;
645		776
		777	// first try to find a router with a direct connection, route there
		778	// regardless of any other considerations.
		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 != THISNODE
		788	&& can_direct (c->conf, dst->conf)
		789	&& c->ictx && c->octx)
		790	{
		791	prio = c->conf->routerprio;
		792	router = c;
		793	}
		794	}
		795	}
		796
		797	if (router)
		798	return router;
		799
		800	// second try find the router with the highest priority, higher than ours
		801	{
		802	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		803
		804	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		805	{
		806	connection c = i;
		807
		808	if (c->conf->routerprio > prio
		809	&& c != dst
		810	&& c->conf != THISNODE
		811	&& c->ictx && c->octx)
		812	{
		813	prio = c->conf->routerprio;
		814	router = c;
		815	}
		816	}
		817	}
		818
		819	return router;
		820	}
		821
		822	void
		823	vpn::connection_established (connection *c)
		824	{
646	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
647	{	826	{
648	connection c = i;	827	connection o = i;
649		828
650	if (c->conf->routerprio > prio	829	if (!o->is_direct
651	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
652	&& c->ictx && c->octx	831	&& c->si != o->si
653	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
654	{
655	prio = c->conf->routerprio;
656	router = c;
657	}	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	}
658	}	838	}
659
660	return router;
661	}	839	}
662		840
		841	void
663	void vpn::send_connect_request (int id)	842	vpn::send_connect_request (connection *c)
664	{	843	{
665	connection *c = find_router ();	844	connection *r = find_router_for (c);
666		845
667	if (c)	846	if (r)
		847	{
		848	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		849	c->conf->nodename, r->conf->nodename);
668	c->send_connect_request (id);	850	r->send_connect_request (c->conf->id);
		851	}
669	else	852	else
670	// no router found, aggressively connect to all routers	853	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
671	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	854	c->conf->nodename);
672	if ((i)->conf->routerprio && (i)->conf != THISNODE)
673	(*i)->establish_connection ();
674	}	855	}
675		856
676	void	857	void
677	connection::dump_status ()	858	connection::dump_status ()
678	{	859	{
679	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	860	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
680	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	861	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
681	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	862	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
682	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	863	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
683	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	864	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
684	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
685	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
686	}	865	}
687		866
688	void	867	void
689	vpn::dump_status ()	868	vpn::dump_status ()
690	{	869	{
691	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	870	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
692		871
693	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	872	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
694	(*c)->dump_status ();	873	(*c)->dump_status ();
695		874
696	slog (L_NOTICE, _("END status dump"));	875	slog (L_NOTICE, _("END status dump"));
697	}	876	}
698		877
699	vpn::vpn (void)	878	vpn::vpn (void)
		879	{
700	: event (this, &vpn::event_cb)	880	event .set<vpn, &vpn::event_cb > (this);
701	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	881	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
702	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	882	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
703	#if ENABLE_TCP	883	#if ENABLE_TCP
704	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	884	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
705	#endif	885	#endif
706	#if ENABLE_ICMP	886	#if ENABLE_ICMP
707	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	887	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
708	#endif	888	#endif
709	, tap_ev_watcher (this, &vpn::tap_ev)	889	#if ENABLE_DNS
710	{	890	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		891	#endif
		892	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
711	}	893	}
712		894
713	vpn::~vpn ()	895	vpn::~vpn ()
714	{	896	{
715	}	897	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs. Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC