[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 1.54 by pcg, Mon Mar 23 15:22:00 2009 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>
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	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
73	}	144	}
74		145
75	int	146	int
76	vpn::setup ()	147	vpn::setup ()
77	{	148	{
		149	int success = 0;
		150
		151	ipv4_tos = -1;
78	ipv4_fd = -1;	152	ipv4_fd = -1;
79		153
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	155	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
83		157
84	if (ipv4_fd < 0)	158	if (ipv4_fd < 0)
85	return -1;	159	return -1;
86
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88		160
89	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	161	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	162	// this I really consider a linux bug. I am neither connected
91	// nor do I fragment myself. Linux still sets DF and doesn't	163	// nor do I fragment myself. Linux still sets DF and doesn't
92	// fragment for me sometimes.	164	// fragment for me sometimes.
…		…
98		170
99	sockinfo si (THISNODE, PROT_IPv4);	171	sockinfo si (THISNODE, PROT_IPv4);
100		172
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	174	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	175	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
104	exit (1);	176	return -1;
105	}	177	}
106		178
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
108	}	181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
109		184
		185	udpv4_tos = -1;
110	udpv4_fd = -1;	186	udpv4_fd = -1;
111		187
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	189	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		191
116	if (udpv4_fd < 0)	192	if (udpv4_fd < 0)
117	return -1;	193	return -1;
118
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
120		194
121	// standard daemon practise...	195	// standard daemon practise...
122	{	196	{
123	int oval = 1;	197	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
136		210
137	sockinfo si (THISNODE, PROT_UDPv4);	211	sockinfo si (THISNODE, PROT_UDPv4);
138		212
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	214	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	215	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
142	exit (1);	216	return -1;
143	}	217	}
144		218
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
146	}	221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
147		224
		225	icmpv4_tos = -1;
148	icmpv4_fd = -1;	226	icmpv4_fd = -1;
149		227
150	#if ENABLE_ICMP	228	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	229	if (THISNODE->protocols & PROT_ICMPv4)
152	{	230	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		232
155	if (icmpv4_fd < 0)	233	if (icmpv4_fd < 0)
156	return -1;	234	return -1;
157
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
159		235
160	#ifdef ICMP_FILTER	236	#ifdef ICMP_FILTER
161	{	237	{
162	icmp_filter oval;	238	icmp_filter oval;
163	oval.data = 0xffffffff;	239	oval.data = 0xffffffff;
…		…
172	// this I really consider a linux bug. I am neither connected	248	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	249	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	250	// fragment for me sometimes.
175	{	251	{
176	int oval = IP_PMTUDISC_DONT;	252	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	254	}
179	#endif	255	#endif
180		256
181	sockinfo si (THISNODE, PROT_ICMPv4);	257	sockinfo si (THISNODE, PROT_ICMPv4);
182		258
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	260	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	261	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
186	exit (1);	262	return -1;
187	}	263	}
188		264
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
190	}	267	}
191	#endif	268	#endif
192		269
193	tcpv4_fd = -1;	270	tcpv4_fd = -1;
194		271
195	#if ENABLE_TCP	272	#if ENABLE_TCP
196	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
197	{	274	{
198	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
199		276
200	if (tcpv4_fd < 0)	277	if (tcpv4_fd < 0)
201	return -1;	278	return -1;
202		279
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
204
205	// standard daemon practise...	280	// standard daemon practise...
206	{	281	{
207	int oval = 1;	282	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	283	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
209	}	284	}
210		285
211	sockinfo si (THISNODE, PROT_TCPv4);	286	sockinfo si (THISNODE, PROT_TCPv4);
212		287
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	289	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	290	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
216	exit (1);	291	return -1;
217	}	292	}
218		293
219	if (listen (tcpv4_fd, 5))	294	if (listen (tcpv4_fd, 5))
220	{	295	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	296	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
222	exit (1);	297	return -1;
		298	}
		299
		300	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		301	++success;
		302	}
		303	else
		304	THISNODE->protocols &= ~PROT_TCPv4;
		305	#endif
		306
		307	dnsv4_tos = -1;
		308	dnsv4_fd = -1;
		309
		310	#if ENABLE_DNS
		311	if (THISNODE->protocols & PROT_DNSv4)
		312	{
		313	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		314
		315	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		316
		317	if (dnsv4_fd < 0)
		318	return -1;
		319
		320	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		321	// this I really consider a linux bug. I am neither connected
		322	// nor do I fragment myself. Linux still sets DF and doesn't
		323	// fragment for me sometimes.
		324	{
		325	int oval = IP_PMTUDISC_DONT;
		326	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
223	}	327	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#endif	328	# endif
		329
		330	// standard daemon practise...
		331	{
		332	int oval = 1;
		333	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		334	}
		335
		336	sockinfo si (THISNODE->dns_hostname,
		337	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		338	PROT_DNSv4);
		339
		340	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		341	{
		342	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		343	return -1;
		344	}
		345
		346	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		347	++success;
		348	}
		349	#endif
		350
		351	/////////////////////////////////////////////////////////////////////////////
		352
		353	if (!success)
		354	{
		355	slog (L_ERR, _("no protocols enabled."));
		356	return -1;
		357	}
		358
		359	reconnect_all ();
		360
		361	/////////////////////////////////////////////////////////////////////////////
228		362
229	tap = new tap_device ();	363	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
231	{	365	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
233	exit (1);	367	return -1;
234	}	368	}
235		369
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		371
		372	run_script_cb cb;
		373	cb.set<vpn, &vpn::script_if_init> (this);
		374
		375	if (tap->if_up () &&
		376	!run_script (cb, true))
		377	{
		378	slog (L_ERR, _("interface initialization command '%s' failed."),
		379	tap->if_up ());
		380	return -1;
		381	}
		382
		383	cb.set<vpn, &vpn::script_if_up> (this);
		384	if (!run_script (cb, true))
		385	{
		386	slog (L_ERR, _("if-up command execution failed."));
		387	return -1;
		388	}
		389
238	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		391
242	return 0;	392	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	}	393	}
272		394
273	bool	395	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	396	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	397	{
276	#if defined(SOL_IP) && defined(IP_TOS)	398	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 ());	399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
280		400
281	return true;	401	return true;
282	}	402	}
283		403
…		…
306		426
307	#if ENABLE_ICMP	427	#if ENABLE_ICMP
308	bool	428	bool
309	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	429	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
310	{	430	{
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);	431	pkt->unshift_hdr (4);
316		432
317	icmp_header hdr = (icmp_header )&((*pkt)[0]);	433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
318	hdr->type = ::conf.icmp_type;	434	hdr->type = ::conf.icmp_type;
319	hdr->code = 255;	435	hdr->code = 255;
320	hdr->checksum = 0;	436	hdr->checksum = 0;
321	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
322		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
323	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	440	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
324		441
325	return true;	442	return true;
326	}	443	}
327	#endif	444	#endif
328		445
329	bool	446	bool
330	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	447	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
331	{	448	{
332	#if defined(SOL_IP) && defined(IP_TOS)	449	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 ());	450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
336		451
337	return true;	452	return true;
		453	}
		454
		455	void
		456	vpn::inject_data_packet (tap_packet *pkt, int dst)
		457	{
		458	if (dst)
		459	{
		460	// unicast
		461	if (dst != THISNODE->id)
		462	conns[dst - 1]->inject_data_packet (pkt);
		463	}
		464	else
		465	{
		466	// broadcast, this is ugly, but due to the security policy
		467	// we have to connect to all hosts...
		468	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		469	if ((*c)->conf != THISNODE)
		470	(*c)->inject_data_packet (pkt);
		471	}
338	}	472	}
339		473
340	void	474	void
341	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
342	{	476	{
343	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
344	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
345		479
346	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	480	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);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
348		482
349	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
350	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
351	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
352	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	486	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
353	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
354	else if (dst > conns.size ())	488	else if (dst > conns.size ())
355	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	489	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
356	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
357	else	491	else
358	{	492	{
359	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
360		494
361	if (dst == 0)	495	if (dst == 0)
362	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
363	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
364	else if (dst != 0 && dst != THISNODE->id)	498	else if (dst != THISNODE->id)
365	{	499	{
366	if (THISNODE->routerprio)	500	if (THISNODE->routerprio)
367	// the tos setting gets lost here. who cares.	501	// the tos setting gets lost here. who cares.
368	conns[dst - 1]->inject_vpn_packet (pkt);	502	conns[dst - 1]->inject_vpn_packet (pkt);
369	else	503	else
370	slog (L_WARN,	504	slog (L_WARN,
371	_("%s(%s): forwarding request (=> %s), but we are no router"),	505	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
372	c->conf->nodename, (const char *)rsi,	506	c->conf->nodename, (const char *)rsi,
373	conns[dst - 1]->conf->nodename);	507	conns[dst - 1]->conf->nodename);
374	}	508	}
375	else	509	else
376	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
377	}	511	}
378	}	512	}
379		513
380	void	514	bool
		515	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		516	{
		517	switch (si.prot)
		518	{
		519	case PROT_IPv4:
		520	return send_ipv4_packet (pkt, si, tos);
		521
		522	case PROT_UDPv4:
		523	return send_udpv4_packet (pkt, si, tos);
		524
		525	#if ENABLE_TCP
		526	case PROT_TCPv4:
		527	return send_tcpv4_packet (pkt, si, tos);
		528	#endif
		529	#if ENABLE_ICMP
		530	case PROT_ICMPv4:
		531	return send_icmpv4_packet (pkt, si, tos);
		532	#endif
		533	#if ENABLE_DNS
		534	case PROT_DNSv4:
		535	return send_dnsv4_packet (pkt, si, tos);
		536	#endif
		537	default:
		538	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		539	}
		540
		541	return false;
		542	}
		543
		544	inline void
381	vpn::ipv4_ev (io_watcher &w, short revents)	545	vpn::ipv4_ev (ev::io &w, int revents)
382	{	546	{
383	if (revents & (POLLIN \| POLLERR))	547	if (revents & EV_READ)
384	{	548	{
385	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
386	struct sockaddr_in sa;	550	struct sockaddr_in sa;
387	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
388	int len;	552	int len;
…		…
393		557
394	if (len > 0)	558	if (len > 0)
395	{	559	{
396	pkt->len = len;	560	pkt->len = len;
397		561
398	// raw sockets deliver the ipv4, but don't expect it on sends	562	// raw sockets deliver the ipv4 header, but don't expect it on sends
399	// this is slow, but...
400	pkt->skip_hdr (IP_OVERHEAD);	563	pkt->skip_hdr (IP_OVERHEAD);
401		564
402	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
403	}	566	}
404	else	567	else
405	{	568	{
406	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
407	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
408	}	571	}
409		572
410	delete pkt;	573	delete pkt;
411	}	574	}
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	575	else
419	{	576	{
420	slog (L_ERR,	577	slog (L_ERR,
421	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
422	revents);	579	revents);
423	exit (1);	580	exit (EXIT_FAILURE);
424	}	581	}
425	}	582	}
426		583
427	#if ENABLE_ICMP	584	#if ENABLE_ICMP
428	void	585	inline void
429	vpn::icmpv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
430	{	587	{
431	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
432	{	589	{
433	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
434	struct sockaddr_in sa;	591	struct sockaddr_in sa;
435	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
436	int len;	593	int len;
…		…
456	}	613	}
457	}	614	}
458	else	615	else
459	{	616	{
460	// probably ECONNRESET or somesuch	617	// probably ECONNRESET or somesuch
461	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	618	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
462	}	619	}
463		620
464	delete pkt;	621	delete pkt;
465	}	622	}
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	623	else
473	{	624	{
474	slog (L_ERR,	625	slog (L_ERR,
475	_("FATAL: unknown revents %08x in socket, terminating\n"),	626	_("FATAL: unknown revents %08x in socket, exiting.\n"),
476	revents);	627	revents);
477	exit (1);	628	exit (EXIT_FAILURE);
478	}	629	}
479	}	630	}
480	#endif	631	#endif
481		632
482	void	633	inline void
483	vpn::udpv4_ev (io_watcher &w, short revents)	634	vpn::udpv4_ev (ev::io &w, int revents)
484	{	635	{
485	if (revents & (POLLIN \| POLLERR))	636	if (revents & EV_READ)
486	{	637	{
487	vpn_packet *pkt = new vpn_packet;	638	vpn_packet *pkt = new vpn_packet;
488	struct sockaddr_in sa;	639	struct sockaddr_in sa;
489	socklen_t sa_len = sizeof (sa);	640	socklen_t sa_len = sizeof (sa);
490	int len;	641	int len;
…		…
500	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
501	}	652	}
502	else	653	else
503	{	654	{
504	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
505	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	656	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
506	}	657	}
507		658
508	delete pkt;	659	delete pkt;
509	}	660	}
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	661	else
517	{	662	{
518	slog (L_ERR,	663	slog (L_ERR,
519	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
520	revents);	665	revents);
521	exit (1);	666	exit (EXIT_FAILURE);
522	}	667	}
523	}	668	}
524		669
525	void	670	inline void
526	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
527	{	672	{
528	if (revents & POLLIN)	673	if (revents & EV_READ)
529	{	674	{
530	/* process data */	675	/* process data */
531	tap_packet *pkt;	676	tap_packet *pkt;
532		677
533	pkt = tap->recv ();	678	pkt = tap->recv ();
534		679
		680	if (!pkt)
		681	return;
		682
		683	if (pkt->len > 14)
		684	{
535	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
536	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
537		687
538	if (src != THISNODE->id)	688	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	{	689	{
556	// unicast	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
557	if (dst != THISNODE->id)	691	exit (EXIT_FAILURE);
558	conns[dst - 1]->inject_data_packet (pkt);
559	}	692	}
		693
		694	if (dst == THISNODE->id)
		695	{
		696	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		697	exit (EXIT_FAILURE);
		698	}
		699
		700	if (dst > conns.size ())
		701	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
560	else	702	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);	703	inject_data_packet (pkt, dst);
567	}
568	}	704	}
569		705
570	delete pkt;	706	delete pkt;
571	}	707	}
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	708	else
578	abort ();	709	abort ();
579	}	710	}
580		711
581	void	712	inline void
582	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
583	{	714	{
584	if (events)	715	if (events)
585	{	716	{
586	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
587	{	718	{
588	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
589		720
590	shutdown_all ();	721	shutdown_all ();
591
592	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
593
594	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
595		724	exit (EXIT_SUCCESS);
596	exit (0);
597	}	725	}
598		726
599	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
600	{	728	{
601	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
602		730
603	reconnect_all ();	731	reconnect_all ();
604	}	732	}
605		733
606	events = 0;	734	events = 0;
607	}	735	}
608
609	w.at = TSTAMP_CANCEL;
610	}	736	}
611		737
612	void	738	void
613	vpn::shutdown_all ()	739	vpn::shutdown_all ()
614	{	740	{
…		…
624		750
625	conns.clear ();	751	conns.clear ();
626		752
627	connection_init ();	753	connection_init ();
628		754
629	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
630	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
631	{
632	connection *conn = new connection (this);
633		757
634	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
635	conns.push_back (conn);
636
637	conn->establish_connection ();	759	(*c)->establish_connection ();
638	}
639	}	760	}
640		761
641	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
642	{	763	{
643	u32 prio = 1;	764	return src != dst
		765	&& src->may_direct (dst)
		766	&& dst->may_direct (src)
		767	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		768	\|\| (src->protocols & dst->connectable_protocols ()));
		769	}
		770
		771	// only works for indirect and routed connections: find a router
		772	// from THISNODE to dst
		773	connection 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 vpn::connection_established (connection *c)
		823	{
646	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
647	{	825	{
648	connection c = i;	826	connection o = i;
649		827
650	if (c->conf->routerprio > prio	828	if (!o->is_direct
651	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	829	&& o->si.valid ()
652	&& c->ictx && c->octx	830	&& c->si != o->si
653	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	831	&& c == find_router_for (o))
654	{
655	prio = c->conf->routerprio;
656	router = c;
657	}	832	{
		833	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		834	o->conf->nodename, c->conf->nodename);
		835	o->rekey ();
		836	}
658	}	837	}
659
660	return router;
661	}	838	}
662		839
663	void vpn::send_connect_request (int id)	840	void vpn::send_connect_request (connection *c)
664	{	841	{
665	connection *c = find_router ();	842	connection *r = find_router_for (c);
666		843
667	if (c)	844	if (r)
		845	{
		846	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		847	c->conf->nodename, r->conf->nodename);
668	c->send_connect_request (id);	848	r->send_connect_request (c->conf->id);
		849	}
669	else	850	else
670	// no router found, aggressively connect to all routers	851	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)	852	c->conf->nodename);
672	if ((i)->conf->routerprio && (i)->conf != THISNODE)
673	(*i)->establish_connection ();
674	}	853	}
675		854
676	void	855	void
677	connection::dump_status ()	856	connection::dump_status ()
678	{	857	{
679	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
680	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
681	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
682	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	861	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
683	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(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	}	863	}
687		864
688	void	865	void
689	vpn::dump_status ()	866	vpn::dump_status ()
690	{	867	{
691	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
692		869
693	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
694	(*c)->dump_status ();	871	(*c)->dump_status ();
695		872
696	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
697	}	874	}
698		875
699	vpn::vpn (void)	876	vpn::vpn (void)
		877	{
700	: event (this, &vpn::event_cb)	878	event .set<vpn, &vpn::event_cb > (this);
701	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
702	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
703	#if ENABLE_TCP	881	#if ENABLE_TCP
704	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
705	#endif	883	#endif
706	#if ENABLE_ICMP	884	#if ENABLE_ICMP
707	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
708	#endif	886	#endif
709	, tap_ev_watcher (this, &vpn::tap_ev)	887	#if ENABLE_DNS
710	{	888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
711	}	891	}
712		892
713	vpn::~vpn ()	893	vpn::~vpn ()
714	{	894	{
715	}	895	}

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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 1.54 by pcg, Mon Mar 23 15:22:00 2009 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 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC