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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.22 by pcg, Sat Jan 17 01:18:36 2004 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) 2003-2004 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>
23		35
		36	#include <cstdio>
		37	#include <cstring>
24	#include <cstdlib>	38	#include <cstdlib>
25	#include <cstring>
26	#include <cstdio>
27		39
28	#include <sys/types.h>	40	#include <sys/types.h>
29	#include <sys/socket.h>	41	#include <sys/socket.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <errno.h>	43	#include <errno.h>
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 (1);	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 (1);	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 (1);	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		280
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
203
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);
208	}	285	}
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 (1);	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 (1);	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;
		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);
225	}	328	}
226	#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	/////////////////////////////////////////////////////////////////////////////
227		363
228	tap = new tap_device ();	364	tap = new tap_device ();
229	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
230	{	366	{
231	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
232	exit (1);	368	return -1;
233	}	369	}
234		370
235	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
236		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
237	tap_ev_watcher.start (tap->fd, EVENT_READ);	391	tap_ev_watcher.start (tap->fd, EV_READ);
238
239	reconnect_all ();
240		392
241	return 0;	393	return 0;
242	}
243
244	// send a vpn packet out to other hosts
245	bool
246	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
247	{
248	switch (si.prot)
249	{
250	case PROT_IPv4:
251	return send_ipv4_packet (pkt, si, tos);
252
253	case PROT_UDPv4:
254	return send_udpv4_packet (pkt, si, tos);
255
256	#if ENABLE_TCP
257	case PROT_TCPv4:
258	return send_tcpv4_packet (pkt, si, tos);
259	#endif
260
261	#if ENABLE_ICMP
262	case PROT_ICMPv4:
263	return send_icmpv4_packet (pkt, si, tos);
264	#endif
265
266	default:
267	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
268	return false;
269	}
270	}	394	}
271		395
272	bool	396	bool
273	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)
274	{	398	{
275	#if defined(SOL_IP) && defined(IP_TOS)	399	set_tos (ipv4_fd, ipv4_tos, tos);
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
277	#endif
278	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 ());
279		401
280	return true;	402	return true;
281	}	403	}
282		404
…		…
305		427
306	#if ENABLE_ICMP	428	#if ENABLE_ICMP
307	bool	429	bool
308	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)
309	{	431	{
310	#if defined(SOL_IP) && defined(IP_TOS)
311	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
312	#endif
313
314	pkt->unshift_hdr (4);	432	pkt->unshift_hdr (4);
315		433
316	icmp_header hdr = (icmp_header )&((*pkt)[0]);	434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
317	hdr->type = ::conf.icmp_type;	435	hdr->type = ::conf.icmp_type;
318	hdr->code = 255;	436	hdr->code = 255;
319	hdr->checksum = 0;	437	hdr->checksum = 0;
320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
321		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
322	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 ());
323		442
324	return true;	443	return true;
325	}	444	}
326	#endif	445	#endif
327		446
328	bool	447	bool
329	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)
330	{	449	{
331	#if defined(SOL_IP) && defined(IP_TOS)	450	set_tos (udpv4_fd, udpv4_tos, tos);
332	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333	#endif
334	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 ());
335		452
336	return true;	453	return true;
337	}	454	}
338		455
…		…
349	{	466	{
350	// broadcast, this is ugly, but due to the security policy	467	// broadcast, this is ugly, but due to the security policy
351	// we have to connect to all hosts...	468	// we have to connect to all hosts...
352	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
353	if ((*c)->conf != THISNODE)	470	if ((*c)->conf != THISNODE)
354	(*c)->inject_data_packet (pkt, true);	471	(*c)->inject_data_packet (pkt);
355	}	472	}
356	}	473	}
357		474
358	void	475	void
359	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
360	{	477	{
361	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
362	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
363		480
364	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."),
365	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
366		483
367	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
368	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
369	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
370	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)."),
371	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
372	else if (dst > conns.size ())
373	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
375	else	489	else
376	{	490	{
377	connection *c = conns[src - 1];	491	connection *c = conns[src - 1];
378		492
379	if (dst == 0)	493	if (dst == 0)
380	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	494	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
381	c->conf->nodename, (const char *)rsi);	495	c->conf->nodename, (const char *)rsi);
382	else if (dst != THISNODE->id)	496	else if (dst != THISNODE->id)
383	{	497	{
384	if (THISNODE->routerprio)	498	if (THISNODE->routerprio)
385	// the tos setting gets lost here. who cares.	499	// the tos setting gets lost here. who cares.
386	conns[dst - 1]->inject_vpn_packet (pkt);	500	conns[dst - 1]->inject_vpn_packet (pkt);
387	else	501	else
388	slog (L_WARN,	502	slog (L_WARN,
389	_("%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?)."),
390	c->conf->nodename, (const char *)rsi,	504	c->conf->nodename, (const char *)rsi,
391	conns[dst - 1]->conf->nodename);	505	conns[dst - 1]->conf->nodename);
392	}	506	}
393	else	507	else
394	c->recv_vpn_packet (pkt, rsi);	508	c->recv_vpn_packet (pkt, rsi);
395	}	509	}
396	}	510	}
397		511
398	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
399	vpn::ipv4_ev (io_watcher &w, short revents)	543	vpn::ipv4_ev (ev::io &w, int revents)
400	{	544	{
401	if (revents & EVENT_READ)	545	if (revents & EV_READ)
402	{	546	{
403	vpn_packet *pkt = new vpn_packet;	547	vpn_packet *pkt = new vpn_packet;
404	struct sockaddr_in sa;	548	struct sockaddr_in sa;
405	socklen_t sa_len = sizeof (sa);	549	socklen_t sa_len = sizeof (sa);
406	int len;	550	int len;
…		…
411		555
412	if (len > 0)	556	if (len > 0)
413	{	557	{
414	pkt->len = len;	558	pkt->len = len;
415		559
416	// 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
417	// this is slow, but...	561	pkt->skip_hdr (pkt->ipv4_hdr_len ());
418	pkt->skip_hdr (IP_OVERHEAD);
419		562
420	recv_vpn_packet (pkt, si);	563	recv_vpn_packet (pkt, si);
421	}	564	}
422	else	565	else
423	{	566	{
424	// probably ECONNRESET or somesuch	567	// probably ECONNRESET or somesuch
425	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	568	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
426	}	569	}
427		570
428	delete pkt;	571	delete pkt;
429	}	572	}
430	else	573	else
431	{	574	{
432	slog (L_ERR,	575	slog (L_ERR,
433	_("FATAL: unknown revents %08x in socket, terminating\n"),	576	_("FATAL: unknown revents %08x in socket, exiting.\n"),
434	revents);	577	revents);
435	exit (1);	578	exit (EXIT_FAILURE);
436	}	579	}
437	}	580	}
438		581
439	#if ENABLE_ICMP	582	#if ENABLE_ICMP
440	void	583	inline void
441	vpn::icmpv4_ev (io_watcher &w, short revents)	584	vpn::icmpv4_ev (ev::io &w, int revents)
442	{	585	{
443	if (revents & EVENT_READ)	586	if (revents & EV_READ)
444	{	587	{
445	vpn_packet *pkt = new vpn_packet;	588	vpn_packet *pkt = new vpn_packet;
446	struct sockaddr_in sa;	589	struct sockaddr_in sa;
447	socklen_t sa_len = sizeof (sa);	590	socklen_t sa_len = sizeof (sa);
448	int len;	591	int len;
…		…
460	if (hdr->type == ::conf.icmp_type	603	if (hdr->type == ::conf.icmp_type
461	&& hdr->code == 255)	604	&& hdr->code == 255)
462	{	605	{
463	// 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
464	// this is slow, but...	607	// this is slow, but...
465	pkt->skip_hdr (ICMP_OVERHEAD);	608	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
466		609
467	recv_vpn_packet (pkt, si);	610	recv_vpn_packet (pkt, si);
468	}	611	}
469	}	612	}
470	else	613	else
471	{	614	{
472	// probably ECONNRESET or somesuch	615	// probably ECONNRESET or somesuch
473	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	616	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
474	}	617	}
475		618
476	delete pkt;	619	delete pkt;
477	}	620	}
478	else	621	else
479	{	622	{
480	slog (L_ERR,	623	slog (L_ERR,
481	_("FATAL: unknown revents %08x in socket, terminating\n"),	624	_("FATAL: unknown revents %08x in socket, exiting.\n"),
482	revents);	625	revents);
483	exit (1);	626	exit (EXIT_FAILURE);
484	}	627	}
485	}	628	}
486	#endif	629	#endif
487		630
488	void	631	inline void
489	vpn::udpv4_ev (io_watcher &w, short revents)	632	vpn::udpv4_ev (ev::io &w, int revents)
490	{	633	{
491	if (revents & EVENT_READ)	634	if (revents & EV_READ)
492	{	635	{
493	vpn_packet *pkt = new vpn_packet;	636	vpn_packet *pkt = new vpn_packet;
494	struct sockaddr_in sa;	637	struct sockaddr_in sa;
495	socklen_t sa_len = sizeof (sa);	638	socklen_t sa_len = sizeof (sa);
496	int len;	639	int len;
…		…
506	recv_vpn_packet (pkt, si);	649	recv_vpn_packet (pkt, si);
507	}	650	}
508	else	651	else
509	{	652	{
510	// probably ECONNRESET or somesuch	653	// probably ECONNRESET or somesuch
511	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));
512	}	655	}
513		656
514	delete pkt;	657	delete pkt;
515	}	658	}
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 & EVENT_READ)	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 ();
…		…
540	int dst = mac2id (pkt->dst);	683	int dst = mac2id (pkt->dst);
541	int src = mac2id (pkt->src);	684	int src = mac2id (pkt->src);
542		685
543	if (src != THISNODE->id)	686	if (src != THISNODE->id)
544	{	687	{
545	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	688	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
546	exit (1);	689	exit (EXIT_FAILURE);
547	}	690	}
548		691
549	if (dst == THISNODE->id)	692	if (dst == THISNODE->id)
550	{	693	{
551	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	694	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
552	exit (1);	695	exit (EXIT_FAILURE);
553	}	696	}
554		697
555	if (dst > conns.size ())	698	if (dst > conns.size ())
556	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	699	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
557	else	700	else
…		…
562	}	705	}
563	else	706	else
564	abort ();	707	abort ();
565	}	708	}
566		709
567	void	710	inline void
568	vpn::event_cb (time_watcher &w)	711	vpn::event_cb (ev::timer &w, int)
569	{	712	{
570	if (events)	713	if (events)
571	{	714	{
572	if (events & EVENT_SHUTDOWN)	715	if (events & EVENT_SHUTDOWN)
573	{	716	{
574	slog (L_INFO, _("preparing shutdown..."));	717	slog (L_INFO, _("preparing shutdown..."));
575		718
576	shutdown_all ();	719	shutdown_all ();
577	remove_pid (pidfilename);	720	remove_pid (conf.pidfilename);
578	slog (L_INFO, _("terminating"));	721	slog (L_INFO, _("exiting."));
579	exit (0);	722	exit (EXIT_SUCCESS);
580	}	723	}
581		724
582	if (events & EVENT_RECONNECT)	725	if (events & EVENT_RECONNECT)
583	{	726	{
584	slog (L_INFO, _("forced reconnect"));	727	slog (L_INFO, _("forced reconnect."));
585		728
586	reconnect_all ();	729	reconnect_all ();
587	}	730	}
588		731
589	events = 0;	732	events = 0;
…		…
605		748
606	conns.clear ();	749	conns.clear ();
607		750
608	connection_init ();	751	connection_init ();
609		752
610	for (configuration::node_vector::iterator i = conf.nodes.begin ();	753	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
611	i != conf.nodes.end (); ++i)	754	conns.push_back (new connection (this, *i));
612	{
613	connection *conn = new connection (this);
614		755
615	conn->conf = *i;	756	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
616	conns.push_back (conn);
617
618	conn->establish_connection ();	757	(*c)->establish_connection ();
619	}
620	}	758	}
621		759
622	connection *vpn::find_router ()	760	bool
		761	vpn::can_direct (conf_node src, conf_node dst) const
623	{	762	{
624	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	{
625	connection *router = 0;	775	connection *router = 0;
626		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	{
627	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
628	{	826	{
629	connection c = i;	827	connection o = i;
630		828
631	if (c->conf->routerprio > prio	829	if (!o->is_direct
632	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
633	&& c->ictx && c->octx	831	&& c->si != o->si
634	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
635	{
636	prio = c->conf->routerprio;
637	router = c;
638	}	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	}
639	}	838	}
640
641	return router;
642	}	839	}
643		840
		841	void
644	void vpn::send_connect_request (int id)	842	vpn::send_connect_request (connection *c)
645	{	843	{
646	connection *c = find_router ();	844	connection *r = find_router_for (c);
647		845
648	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);
649	c->send_connect_request (id);	850	r->send_connect_request (c->conf->id);
		851	}
650	else	852	else
651	// 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."),
652	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	854	c->conf->nodename);
653	if ((i)->conf->routerprio && (i)->conf != THISNODE)
654	(*i)->establish_connection ();
655	}	855	}
656		856
657	void	857	void
658	connection::dump_status ()	858	connection::dump_status ()
659	{	859	{
660	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	860	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
661	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	861	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
662	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	862	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
663	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"),
664	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	864	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
665	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
666	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
667	}	865	}
668		866
669	void	867	void
670	vpn::dump_status ()	868	vpn::dump_status ()
671	{	869	{
672	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	870	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
673		871
674	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	872	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
675	(*c)->dump_status ();	873	(*c)->dump_status ();
676		874
677	slog (L_NOTICE, _("END status dump"));	875	slog (L_NOTICE, _("END status dump"));
678	}	876	}
679		877
680	vpn::vpn (void)	878	vpn::vpn (void)
		879	{
681	: event (this, &vpn::event_cb)	880	event .set<vpn, &vpn::event_cb > (this);
682	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	881	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
683	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	882	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
684	#if ENABLE_TCP	883	#if ENABLE_TCP
685	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	884	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
686	#endif	885	#endif
687	#if ENABLE_ICMP	886	#if ENABLE_ICMP
688	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	887	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
689	#endif	888	#endif
690	, tap_ev_watcher (this, &vpn::tap_ev)	889	#if ENABLE_DNS
691	{	890	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		891	#endif
		892	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
692	}	893	}
693		894
694	vpn::~vpn ()	895	vpn::~vpn ()
695	{	896	{
696	}	897	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.22 by pcg, Sat Jan 17 01:18:36 2004 UTC vs. Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.22 by pcg, Sat Jan 17 01:18:36 2004 UTC vs.
Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC