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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.25 by pcg, Sun Jul 25 18:11:40 2004 UTC vs.
Revision 1.58 by root, Tue Feb 15 13:31:23 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) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	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
6	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
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	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
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	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
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	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.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <list>	34	#include <list>
44		56
45	vpn network; // THE vpn (bad design...)	57	vpn network; // THE vpn (bad design...)
46		58
47	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
48		60
49	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 ()
50	{	75	{
51	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
52	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
53	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57		82
58	char *env;	83	char *env;
59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);	87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu); putenv (env);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	THISNODE->id & 0xff);
69	putenv (env);
70		91
		92	conns [THISNODE->id - 1]->script_init_env ("");
		93
		94	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		95	{
		96	char ext[16];
		97	snprintf (ext, 16, "_%d", (*c)->conf->id);
		98	(*c)->script_init_env (ext);
		99	}
		100	}
		101
		102	inline const char *
		103	vpn::script_if_init ()
		104	{
		105	script_init_env ();
		106
		107	return tap->if_up ();
		108	}
		109
		110	inline const char *
		111	vpn::script_if_up ()
		112	{
		113	script_init_env ();
		114
		115	char *filename;
		116	asprintf (&filename,
		117	"%s/%s",
		118	confbase,
71	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	119	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		120
		121	return filename;
		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;
72	}	145	}
73		146
74	int	147	int
75	vpn::setup ()	148	vpn::setup ()
76	{	149	{
		150	int success = 0;
		151
		152	ipv4_tos = -1;
77	ipv4_fd = -1;	153	ipv4_fd = -1;
78		154
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	156	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
82		158
83	if (ipv4_fd < 0)	159	if (ipv4_fd < 0)
84	return -1;	160	return -1;
85
86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
87		161
88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
90	// 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
91	// fragment for me sometimes.	165	// fragment for me sometimes.
…		…
97		171
98	sockinfo si (THISNODE, PROT_IPv4);	172	sockinfo si (THISNODE, PROT_IPv4);
99		173
100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101	{	175	{
102	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));
103	exit (EXIT_FAILURE);	177	return -1;
104	}	178	}
105		179
106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
107	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
108		185
		186	udpv4_tos = -1;
109	udpv4_fd = -1;	187	udpv4_fd = -1;
110		188
111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112	{	190	{
113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114		192
115	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
116	return -1;	194	return -1;
117
118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
119		195
120	// standard daemon practise...	196	// standard daemon practise...
121	{	197	{
122	int oval = 1;	198	int oval = 1;
123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
135		211
136	sockinfo si (THISNODE, PROT_UDPv4);	212	sockinfo si (THISNODE, PROT_UDPv4);
137		213
138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139	{	215	{
140	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));
141	exit (EXIT_FAILURE);	217	return -1;
142	}	218	}
143		219
144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
145	}	222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
146		225
		226	icmpv4_tos = -1;
147	icmpv4_fd = -1;	227	icmpv4_fd = -1;
148		228
149	#if ENABLE_ICMP	229	#if ENABLE_ICMP
150	if (THISNODE->protocols & PROT_ICMPv4)	230	if (THISNODE->protocols & PROT_ICMPv4)
151	{	231	{
152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
153		233
154	if (icmpv4_fd < 0)	234	if (icmpv4_fd < 0)
155	return -1;	235	return -1;
156
157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
158		236
159	#ifdef ICMP_FILTER	237	#ifdef ICMP_FILTER
160	{	238	{
161	icmp_filter oval;	239	icmp_filter oval;
162	oval.data = 0xffffffff;	240	oval.data = 0xffffffff;
…		…
171	// this I really consider a linux bug. I am neither connected	249	// this I really consider a linux bug. I am neither connected
172	// 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
173	// fragment for me sometimes.	251	// fragment for me sometimes.
174	{	252	{
175	int oval = IP_PMTUDISC_DONT;	253	int oval = IP_PMTUDISC_DONT;
176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	255	}
178	#endif	256	#endif
179		257
180	sockinfo si (THISNODE, PROT_ICMPv4);	258	sockinfo si (THISNODE, PROT_ICMPv4);
181		259
182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183	{	261	{
184	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));
185	exit (EXIT_FAILURE);	263	return -1;
186	}	264	}
187		265
188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);	266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
189	}	268	}
190	#endif	269	#endif
191		270
192	tcpv4_fd = -1;	271	tcpv4_fd = -1;
193		272
194	#if ENABLE_TCP	273	#if ENABLE_TCP
195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
196	{	275	{
197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
198		277
199	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
200	return -1;	279	return -1;
201
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
203		280
204	// standard daemon practise...	281	// standard daemon practise...
205	{	282	{
206	int oval = 1;	283	int oval = 1;
207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	284	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
209		286
210	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
211		288
212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213	{	290	{
214	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));
215	exit (EXIT_FAILURE);	292	return -1;
216	}	293	}
217		294
218	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
219	{	296	{
220	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));
221	exit (EXIT_FAILURE);	298	return -1;
222	}	299	}
223		300
224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);	301	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		302	++success;
225	}	303	}
		304	else
		305	THISNODE->protocols &= ~PROT_TCPv4;
226	#endif	306	#endif
		307
		308	dnsv4_tos = -1;
		309	dnsv4_fd = -1;
227		310
228	#if ENABLE_DNS	311	#if ENABLE_DNS
229	if (THISNODE->protocols & PROT_DNSv4)	312	if (THISNODE->protocols & PROT_DNSv4)
230	{	313	{
		314	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		315
231	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	316	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
232		317
233	if (dnsv4_fd < 0)	318	if (dnsv4_fd < 0)
234	return -1;	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);
		328	}
		329	# endif
235		330
236	// standard daemon practise...	331	// standard daemon practise...
237	{	332	{
238	int oval = 1;	333	int oval = 1;
239	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	334	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
240	}	335	}
241		336
242	sockinfo si (THISNODE, PROT_DNSv4);	337	sockinfo si (THISNODE->dns_hostname,
		338	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		339	PROT_DNSv4);
243		340
244	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))	341	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
245	{	342	{
246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));	343	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
247	exit (EXIT_FAILURE);	344	return -1;
248	}	345	}
249		346
250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);	347	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		348	++success;
		349	}
		350	#endif
		351
		352	/////////////////////////////////////////////////////////////////////////////
		353
		354	if (!success)
251	}	355	{
252	#endif	356	slog (L_ERR, _("no protocols enabled."));
		357	return -1;
		358	}
		359
		360	reconnect_all ();
		361
		362	/////////////////////////////////////////////////////////////////////////////
253		363
254	tap = new tap_device ();	364	tap = new tap_device ();
255	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
256	{	366	{
257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
258	exit (EXIT_FAILURE);	368	return -1;
259	}	369	}
260		370
261	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
262		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
263	tap_ev_watcher.start (tap->fd, EVENT_READ);	391	tap_ev_watcher.start (tap->fd, EV_READ);
264
265	reconnect_all ();
266		392
267	return 0;	393	return 0;
268	}
269
270	// send a vpn packet out to other hosts
271	bool
272	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
273	{
274	switch (si.prot)
275	{
276	case PROT_IPv4:
277	return send_ipv4_packet (pkt, si, tos);
278
279	case PROT_UDPv4:
280	return send_udpv4_packet (pkt, si, tos);
281
282	#if ENABLE_TCP
283	case PROT_TCPv4:
284	return send_tcpv4_packet (pkt, si, tos);
285	#endif
286
287	#if ENABLE_ICMP
288	case PROT_ICMPv4:
289	return send_icmpv4_packet (pkt, si, tos);
290	#endif
291
292	#if ENABLE_DNS
293	case PROT_DNSv4:
294	return send_dnsv4_packet (pkt, si, tos);
295	#endif
296
297	default:
298	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
299	return false;
300	}
301	}	394	}
302		395
303	bool	396	bool
304	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)
305	{	398	{
306	#if defined(SOL_IP) && defined(IP_TOS)	399	set_tos (ipv4_fd, ipv4_tos, tos);
307	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
308	#endif
309	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 ());
310		401
311	return true;	402	return true;
312	}	403	}
313		404
…		…
336		427
337	#if ENABLE_ICMP	428	#if ENABLE_ICMP
338	bool	429	bool
339	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)
340	{	431	{
341	#if defined(SOL_IP) && defined(IP_TOS)
342	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
343	#endif
344
345	pkt->unshift_hdr (4);	432	pkt->unshift_hdr (4);
346		433
347	icmp_header hdr = (icmp_header )&((*pkt)[0]);	434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
348	hdr->type = ::conf.icmp_type;	435	hdr->type = ::conf.icmp_type;
349	hdr->code = 255;	436	hdr->code = 255;
350	hdr->checksum = 0;	437	hdr->checksum = 0;
351	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
352		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
353	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 ());
354		442
355	return true;	443	return true;
356	}	444	}
357	#endif	445	#endif
358		446
359	bool	447	bool
360	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)
361	{	449	{
362	#if defined(SOL_IP) && defined(IP_TOS)	450	set_tos (udpv4_fd, udpv4_tos, tos);
363	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
364	#endif
365	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 ());
366		452
367	return true;	453	return true;
368	}	454	}
369		455
…		…
380	{	466	{
381	// broadcast, this is ugly, but due to the security policy	467	// broadcast, this is ugly, but due to the security policy
382	// we have to connect to all hosts...	468	// we have to connect to all hosts...
383	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
384	if ((*c)->conf != THISNODE)	470	if ((*c)->conf != THISNODE)
385	(*c)->inject_data_packet (pkt, true);	471	(*c)->inject_data_packet (pkt);
386	}	472	}
387	}	473	}
388		474
389	void	475	void
390	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
391	{	477	{
392	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
393	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
394		480
395	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."),
396	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
397		483
398	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
399	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
400	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
401	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)."),
402	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
403	else if (dst > conns.size ())	489	else if (dst > conns.size ())
404	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	490	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
405	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
406	else	492	else
407	{	493	{
408	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
409		495
410	if (dst == 0)	496	if (dst == 0)
411	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
412	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
413	else if (dst != THISNODE->id)	499	else if (dst != THISNODE->id)
414	{	500	{
415	if (THISNODE->routerprio)	501	if (THISNODE->routerprio)
416	// the tos setting gets lost here. who cares.	502	// the tos setting gets lost here. who cares.
417	conns[dst - 1]->inject_vpn_packet (pkt);	503	conns[dst - 1]->inject_vpn_packet (pkt);
418	else	504	else
419	slog (L_WARN,	505	slog (L_WARN,
420	_("%s(%s): forwarding request (=> %s), but we are no router"),	506	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
421	c->conf->nodename, (const char *)rsi,	507	c->conf->nodename, (const char *)rsi,
422	conns[dst - 1]->conf->nodename);	508	conns[dst - 1]->conf->nodename);
423	}	509	}
424	else	510	else
425	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
426	}	512	}
427	}	513	}
428		514
429	void	515	bool
		516	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		517	{
		518	switch (si.prot)
		519	{
		520	case PROT_IPv4:
		521	return send_ipv4_packet (pkt, si, tos);
		522
		523	case PROT_UDPv4:
		524	return send_udpv4_packet (pkt, si, tos);
		525
		526	#if ENABLE_TCP
		527	case PROT_TCPv4:
		528	return send_tcpv4_packet (pkt, si, tos);
		529	#endif
		530	#if ENABLE_ICMP
		531	case PROT_ICMPv4:
		532	return send_icmpv4_packet (pkt, si, tos);
		533	#endif
		534	#if ENABLE_DNS
		535	case PROT_DNSv4:
		536	return send_dnsv4_packet (pkt, si, tos);
		537	#endif
		538	default:
		539	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		540	}
		541
		542	return false;
		543	}
		544
		545	inline void
430	vpn::ipv4_ev (io_watcher &w, short revents)	546	vpn::ipv4_ev (ev::io &w, int revents)
431	{	547	{
432	if (revents & EVENT_READ)	548	if (revents & EV_READ)
433	{	549	{
434	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
435	struct sockaddr_in sa;	551	struct sockaddr_in sa;
436	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
437	int len;	553	int len;
…		…
442		558
443	if (len > 0)	559	if (len > 0)
444	{	560	{
445	pkt->len = len;	561	pkt->len = len;
446		562
447	// raw sockets deliver the ipv4, but don't expect it on sends	563	// raw sockets deliver the ipv4 header, but don't expect it on sends
448	// this is slow, but...
449	pkt->skip_hdr (IP_OVERHEAD);	564	pkt->skip_hdr (IP_OVERHEAD);
450		565
451	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
452	}	567	}
453	else	568	else
454	{	569	{
455	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
456	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	571	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
457	}	572	}
458		573
459	delete pkt;	574	delete pkt;
460	}	575	}
461	else	576	else
462	{	577	{
463	slog (L_ERR,	578	slog (L_ERR,
464	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
465	revents);	580	revents);
466	exit (EXIT_FAILURE);	581	exit (EXIT_FAILURE);
467	}	582	}
468	}	583	}
469		584
470	#if ENABLE_ICMP	585	#if ENABLE_ICMP
471	void	586	inline void
472	vpn::icmpv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
473	{	588	{
474	if (revents & EVENT_READ)	589	if (revents & EV_READ)
475	{	590	{
476	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
477	struct sockaddr_in sa;	592	struct sockaddr_in sa;
478	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
479	int len;	594	int len;
…		…
499	}	614	}
500	}	615	}
501	else	616	else
502	{	617	{
503	// probably ECONNRESET or somesuch	618	// probably ECONNRESET or somesuch
504	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	619	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
505	}	620	}
506		621
507	delete pkt;	622	delete pkt;
508	}	623	}
509	else	624	else
510	{	625	{
511	slog (L_ERR,	626	slog (L_ERR,
512	_("FATAL: unknown revents %08x in socket, terminating\n"),	627	_("FATAL: unknown revents %08x in socket, exiting.\n"),
513	revents);	628	revents);
514	exit (EXIT_FAILURE);	629	exit (EXIT_FAILURE);
515	}	630	}
516	}	631	}
517	#endif	632	#endif
518		633
519	void	634	inline void
520	vpn::udpv4_ev (io_watcher &w, short revents)	635	vpn::udpv4_ev (ev::io &w, int revents)
521	{	636	{
522	if (revents & EVENT_READ)	637	if (revents & EV_READ)
523	{	638	{
524	vpn_packet *pkt = new vpn_packet;	639	vpn_packet *pkt = new vpn_packet;
525	struct sockaddr_in sa;	640	struct sockaddr_in sa;
526	socklen_t sa_len = sizeof (sa);	641	socklen_t sa_len = sizeof (sa);
527	int len;	642	int len;
…		…
537	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
538	}	653	}
539	else	654	else
540	{	655	{
541	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
542	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	657	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
543	}	658	}
544		659
545	delete pkt;	660	delete pkt;
546	}	661	}
547	else	662	else
548	{	663	{
549	slog (L_ERR,	664	slog (L_ERR,
550	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
551	revents);	666	revents);
552	exit (EXIT_FAILURE);	667	exit (EXIT_FAILURE);
553	}	668	}
554	}	669	}
555		670
556	void	671	inline void
557	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
558	{	673	{
559	if (revents & EVENT_READ)	674	if (revents & EV_READ)
560	{	675	{
561	/* process data */	676	/* process data */
562	tap_packet *pkt;	677	tap_packet *pkt;
563		678
564	pkt = tap->recv ();	679	pkt = tap->recv ();
…		…
571	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
572	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
573		688
574	if (src != THISNODE->id)	689	if (src != THISNODE->id)
575	{	690	{
576	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
577	exit (EXIT_FAILURE);	692	exit (EXIT_FAILURE);
578	}	693	}
579		694
580	if (dst == THISNODE->id)	695	if (dst == THISNODE->id)
581	{	696	{
…		…
593	}	708	}
594	else	709	else
595	abort ();	710	abort ();
596	}	711	}
597		712
598	void	713	inline void
599	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
600	{	715	{
601	if (events)	716	if (events)
602	{	717	{
603	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
604	{	719	{
605	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
606		721
607	shutdown_all ();	722	shutdown_all ();
608	remove_pid (conf.pidfilename);	723	remove_pid (conf.pidfilename);
609	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
610	exit (EXIT_SUCCESS);	725	exit (EXIT_SUCCESS);
611	}	726	}
612		727
613	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
614	{	729	{
615	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
616		731
617	reconnect_all ();	732	reconnect_all ();
618	}	733	}
619		734
620	events = 0;	735	events = 0;
…		…
636		751
637	conns.clear ();	752	conns.clear ();
638		753
639	connection_init ();	754	connection_init ();
640		755
641	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
642	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
643	{
644	connection *conn = new connection (this);
645		758
646	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
647	conns.push_back (conn);
648
649	conn->establish_connection ();	760	(*c)->establish_connection ();
650	}
651	}	761	}
652		762
653	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
654	{	765	{
655	u32 prio = 0;	766	return src != dst
		767	&& src->may_direct (dst)
		768	&& dst->may_direct (src)
		769	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		770	\|\| (src->protocols & dst->connectable_protocols ()));
		771	}
		772
		773	// only works for indirect and routed connections: find a router
		774	// from THISNODE to dst
		775	connection *
		776	vpn::find_router_for (const connection *dst)
		777	{
656	connection *router = 0;	778	connection *router = 0;
657		779
		780	// first try to find a router with a direct connection, route there
		781	// regardless of any other considerations.
		782	{
		783	u32 prio = 1;
		784
		785	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		786	{
		787	connection c = i;
		788
		789	if (c->conf->routerprio > prio
		790	&& c->conf != THISNODE
		791	&& can_direct (c->conf, dst->conf)
		792	&& c->ictx && c->octx)
		793	{
		794	prio = c->conf->routerprio;
		795	router = c;
		796	}
		797	}
		798	}
		799
		800	if (router)
		801	return router;
		802
		803	// second try find the router with the highest priority, higher than ours
		804	{
		805	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		806
		807	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		808	{
		809	connection c = i;
		810
		811	if (c->conf->routerprio > prio
		812	&& c != dst
		813	&& c->conf != THISNODE
		814	&& c->ictx && c->octx)
		815	{
		816	prio = c->conf->routerprio;
		817	router = c;
		818	}
		819	}
		820	}
		821
		822	return router;
		823	}
		824
		825	void
		826	vpn::connection_established (connection *c)
		827	{
658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
659	{	829	{
660	connection c = i;	830	connection o = i;
661		831
662	if (c->conf->routerprio > prio	832	if (!o->is_direct
663	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	833	&& o->si.valid ()
664	&& c->ictx && c->octx	834	&& c->si != o->si
665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	835	&& c == find_router_for (o))
666	{
667	prio = c->conf->routerprio;
668	router = c;
669	}	836	{
		837	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		838	o->conf->nodename, c->conf->nodename);
		839	o->rekey ();
		840	}
670	}	841	}
671
672	return router;
673	}	842	}
674		843
		844	void
675	void vpn::send_connect_request (int id)	845	vpn::send_connect_request (connection *c)
676	{	846	{
677	connection *c = find_router ();	847	connection *r = find_router_for (c);
678		848
679	if (c)	849	if (r)
		850	{
		851	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		852	c->conf->nodename, r->conf->nodename);
680	c->send_connect_request (id);	853	r->send_connect_request (c->conf->id);
		854	}
681	else	855	else
682	// no router found, aggressively connect to all routers	856	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	857	c->conf->nodename);
684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
685	(*i)->establish_connection ();
686	}	858	}
687		859
688	void	860	void
689	connection::dump_status ()	861	connection::dump_status ()
690	{	862	{
691	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
692	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
693	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
694	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	866	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
695	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
696	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
697	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
698	}	868	}
699		869
700	void	870	void
701	vpn::dump_status ()	871	vpn::dump_status ()
702	{	872	{
703	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
704		874
705	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
706	(*c)->dump_status ();	876	(*c)->dump_status ();
707		877
708	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
709	}	879	}
710		880
711	vpn::vpn (void)	881	vpn::vpn (void)
		882	{
712	: event (this, &vpn::event_cb)	883	event .set<vpn, &vpn::event_cb > (this);
713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
715	#if ENABLE_TCP	886	#if ENABLE_TCP
716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
717	#endif	888	#endif
718	#if ENABLE_ICMP	889	#if ENABLE_ICMP
719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	890	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
720	#endif	891	#endif
721	#if ENABLE_DNS	892	#if ENABLE_DNS
722	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)	893	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
723	#endif	894	#endif
724	, tap_ev_watcher (this, &vpn::tap_ev)	895	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
725	{
726	}	896	}
727		897
728	vpn::~vpn ()	898	vpn::~vpn ()
729	{	899	{
730	}	900	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.25 by pcg, Sun Jul 25 18:11:40 2004 UTC vs. Revision 1.58 by root, Tue Feb 15 13:31:23 2011 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.25 by pcg, Sun Jul 25 18:11:40 2004 UTC vs.
Revision 1.58 by root, Tue Feb 15 13:31:23 2011 UTC