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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.16 by pcg, Tue Oct 14 19:59:16 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/wait.h>	42	#include <sys/wait.h>
30	#include <errno.h>	43	#include <errno.h>
39		52
40	#include "connection.h"	53	#include "connection.h"
41	#include "util.h"	54	#include "util.h"
42	#include "vpn.h"	55	#include "vpn.h"
43		56
		57	vpn network; // THE vpn (bad design...)
		58
44	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
45		60
46	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 ()
47	{	75	{
48	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
49	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
50	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		82
55	char *env;	83	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57	putenv (env);
58	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
59	putenv (env);
60	asprintf (&env, "NODEID=%d", THISNODE->id);
61	putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
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	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
72	}	144	}
73		145
74	int	146	int
75	vpn::setup ()	147	vpn::setup ()
76	{	148	{
		149	int success = 0;
		150
		151	ipv4_tos = -1;
77	ipv4_fd = -1;	152	ipv4_fd = -1;
78		153
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	155	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
82		157
83	if (ipv4_fd < 0)	158	if (ipv4_fd < 0)
84	return -1;	159	return -1;
85
86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
87		160
88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	161	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89	// this I really consider a linux bug. I am neither connected	162	// this I really consider a linux bug. I am neither connected
90	// 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
91	// fragment for me sometimes.	164	// fragment for me sometimes.
…		…
97		170
98	sockinfo si (THISNODE, PROT_IPv4);	171	sockinfo si (THISNODE, PROT_IPv4);
99		172
100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101	{	174	{
102	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));
103	exit (1);	176	return -1;
104	}	177	}
105		178
106	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
107	}	181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
108		184
		185	udpv4_tos = -1;
109	udpv4_fd = -1;	186	udpv4_fd = -1;
110		187
111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112	{	189	{
113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114		191
115	if (udpv4_fd < 0)	192	if (udpv4_fd < 0)
116	return -1;	193	return -1;
117
118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
119		194
120	// standard daemon practise...	195	// standard daemon practise...
121	{	196	{
122	int oval = 1;	197	int oval = 1;
123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
135		210
136	sockinfo si (THISNODE, PROT_UDPv4);	211	sockinfo si (THISNODE, PROT_UDPv4);
137		212
138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139	{	214	{
140	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));
141	exit (1);	216	return -1;
142	}	217	}
143		218
144	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
145	}	221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
146		224
		225	icmpv4_tos = -1;
147	icmpv4_fd = -1;	226	icmpv4_fd = -1;
148		227
149	#if ENABLE_ICMP	228	#if ENABLE_ICMP
150	if (THISNODE->protocols & PROT_ICMPv4)	229	if (THISNODE->protocols & PROT_ICMPv4)
151	{	230	{
152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
153		232
154	if (icmpv4_fd < 0)	233	if (icmpv4_fd < 0)
155	return -1;	234	return -1;
156
157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
158		235
159	#ifdef ICMP_FILTER	236	#ifdef ICMP_FILTER
160	{	237	{
161	icmp_filter oval;	238	icmp_filter oval;
162	oval.data = 0xffffffff;	239	oval.data = 0xffffffff;
…		…
171	// this I really consider a linux bug. I am neither connected	248	// this I really consider a linux bug. I am neither connected
172	// 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
173	// fragment for me sometimes.	250	// fragment for me sometimes.
174	{	251	{
175	int oval = IP_PMTUDISC_DONT;	252	int oval = IP_PMTUDISC_DONT;
176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	254	}
178	#endif	255	#endif
179		256
180	sockinfo si (THISNODE, PROT_ICMPv4);	257	sockinfo si (THISNODE, PROT_ICMPv4);
181		258
182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183	{	260	{
184	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));
185	exit (1);	262	return -1;
186	}	263	}
187		264
188	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
189	}	267	}
190	#endif	268	#endif
191		269
192	tcpv4_fd = -1;	270	tcpv4_fd = -1;
193		271
194	#if ENABLE_TCP	272	#if ENABLE_TCP
195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
196	{	274	{
197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
198		276
199	if (tcpv4_fd < 0)	277	if (tcpv4_fd < 0)
200	return -1;	278	return -1;
201		279
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
203
204	// standard daemon practise...	280	// standard daemon practise...
205	{	281	{
206	int oval = 1;	282	int oval = 1;
207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	283	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
208	}	284	}
209		285
210	sockinfo si (THISNODE, PROT_TCPv4);	286	sockinfo si (THISNODE, PROT_TCPv4);
211		287
212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213	{	289	{
214	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));
215	exit (1);	291	return -1;
216	}	292	}
217		293
218	if (listen (tcpv4_fd, 5))	294	if (listen (tcpv4_fd, 5))
219	{	295	{
220	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));
221	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);
222	}	327	}
223
224	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
225	}
226	#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	/////////////////////////////////////////////////////////////////////////////
227		362
228	tap = new tap_device ();	363	tap = new tap_device ();
229	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
230	{	365	{
231	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
232	exit (1);	367	return -1;
233	}	368	}
234		369
235	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
236		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
237	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
238
239	reconnect_all ();
240		391
241	return 0;	392	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	}	393	}
271		394
272	bool	395	bool
273	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)
274	{	397	{
275	#if defined(SOL_IP) && defined(IP_TOS)	398	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 ());	399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
279		400
280	return true;	401	return true;
281	}	402	}
282		403
…		…
305		426
306	#if ENABLE_ICMP	427	#if ENABLE_ICMP
307	bool	428	bool
308	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)
309	{	430	{
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);	431	pkt->unshift_hdr (4);
315		432
316	icmp_header hdr = (icmp_header )&((*pkt)[0]);	433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
317	hdr->type = ::conf.icmp_type;	434	hdr->type = ::conf.icmp_type;
318	hdr->code = 255;	435	hdr->code = 255;
319	hdr->checksum = 0;	436	hdr->checksum = 0;
320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
321		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
322	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 ());
323		441
324	return true;	442	return true;
325	}	443	}
326	#endif	444	#endif
327		445
328	bool	446	bool
329	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)
330	{	448	{
331	#if defined(SOL_IP) && defined(IP_TOS)	449	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 ());	450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335		451
336	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	}
337	}	472	}
338		473
339	void	474	void
340	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
341	{	476	{
342	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
343	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
344		479
345	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."),
346	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
347		482
348	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
349	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
350	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
351	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)."),
352	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
353	else if (dst > conns.size ())	488	else if (dst > conns.size ())
354	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)."),
355	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
356	else	491	else
357	{	492	{
358	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
359		494
360	if (dst == 0)	495	if (dst == 0)
361	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
362	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
363	else if (dst != 0 && dst != THISNODE->id)	498	else if (dst != THISNODE->id)
364	{	499	{
365	if (THISNODE->routerprio)	500	if (THISNODE->routerprio)
366	// the tos setting gets lost here. who cares.	501	// the tos setting gets lost here. who cares.
367	conns[dst - 1]->inject_vpn_packet (pkt);	502	conns[dst - 1]->inject_vpn_packet (pkt);
368	else	503	else
369	slog (L_WARN,	504	slog (L_WARN,
370	_("%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?)."),
371	c->conf->nodename, (const char *)rsi,	506	c->conf->nodename, (const char *)rsi,
372	conns[dst - 1]->conf->nodename);	507	conns[dst - 1]->conf->nodename);
373	}	508	}
374	else	509	else
375	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
376	}	511	}
377	}	512	}
378		513
379	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
380	vpn::ipv4_ev (io_watcher &w, short revents)	545	vpn::ipv4_ev (ev::io &w, int revents)
381	{	546	{
382	if (revents & (POLLIN \| POLLERR))	547	if (revents & EV_READ)
383	{	548	{
384	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
385	struct sockaddr_in sa;	550	struct sockaddr_in sa;
386	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
387	int len;	552	int len;
…		…
392		557
393	if (len > 0)	558	if (len > 0)
394	{	559	{
395	pkt->len = len;	560	pkt->len = len;
396		561
397	// 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
398	// this is slow, but...
399	pkt->skip_hdr (IP_OVERHEAD);	563	pkt->skip_hdr (IP_OVERHEAD);
400		564
401	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
402	}	566	}
403	else	567	else
404	{	568	{
405	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
406	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
407	}	571	}
408		572
409	delete pkt;	573	delete pkt;
410	}	574	}
411	else if (revents & POLLHUP)
412	{
413	// this cannot ;) happen on udp sockets
414	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
415	exit (1);
416	}
417	else	575	else
418	{	576	{
419	slog (L_ERR,	577	slog (L_ERR,
420	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
421	revents);	579	revents);
422	exit (1);	580	exit (EXIT_FAILURE);
423	}	581	}
424	}	582	}
425		583
426	#if ENABLE_ICMP	584	#if ENABLE_ICMP
427	void	585	inline void
428	vpn::icmpv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
429	{	587	{
430	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
431	{	589	{
432	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
433	struct sockaddr_in sa;	591	struct sockaddr_in sa;
434	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
435	int len;	593	int len;
…		…
455	}	613	}
456	}	614	}
457	else	615	else
458	{	616	{
459	// probably ECONNRESET or somesuch	617	// probably ECONNRESET or somesuch
460	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	618	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
461	}	619	}
462		620
463	delete pkt;	621	delete pkt;
464	}	622	}
465	else if (revents & POLLHUP)
466	{
467	// this cannot ;) happen on udp sockets
468	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
469	exit (1);
470	}
471	else	623	else
472	{	624	{
473	slog (L_ERR,	625	slog (L_ERR,
474	_("FATAL: unknown revents %08x in socket, terminating\n"),	626	_("FATAL: unknown revents %08x in socket, exiting.\n"),
475	revents);	627	revents);
476	exit (1);	628	exit (EXIT_FAILURE);
477	}	629	}
478	}	630	}
479	#endif	631	#endif
480		632
481	void	633	inline void
482	vpn::udpv4_ev (io_watcher &w, short revents)	634	vpn::udpv4_ev (ev::io &w, int revents)
483	{	635	{
484	if (revents & (POLLIN \| POLLERR))	636	if (revents & EV_READ)
485	{	637	{
486	vpn_packet *pkt = new vpn_packet;	638	vpn_packet *pkt = new vpn_packet;
487	struct sockaddr_in sa;	639	struct sockaddr_in sa;
488	socklen_t sa_len = sizeof (sa);	640	socklen_t sa_len = sizeof (sa);
489	int len;	641	int len;
…		…
499	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
500	}	652	}
501	else	653	else
502	{	654	{
503	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
504	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));
505	}	657	}
506		658
507	delete pkt;	659	delete pkt;
508	}	660	}
509	else if (revents & POLLHUP)
510	{
511	// this cannot ;) happen on udp sockets
512	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
513	exit (1);
514	}
515	else	661	else
516	{	662	{
517	slog (L_ERR,	663	slog (L_ERR,
518	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
519	revents);	665	revents);
520	exit (1);	666	exit (EXIT_FAILURE);
521	}	667	}
522	}	668	}
523		669
524	void	670	inline void
525	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
526	{	672	{
527	if (revents & POLLIN)	673	if (revents & EV_READ)
528	{	674	{
529	/* process data */	675	/* process data */
530	tap_packet *pkt;	676	tap_packet *pkt;
531		677
532	pkt = tap->recv ();	678	pkt = tap->recv ();
533		679
		680	if (!pkt)
		681	return;
		682
		683	if (pkt->len > 14)
		684	{
534	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
535	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
536		687
537	if (src != THISNODE->id)	688	if (src != THISNODE->id)
538	{
539	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
540	exit (1);
541	}
542
543	if (dst == THISNODE->id)
544	{
545	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
546	exit (1);
547	}
548
549	if (dst > conns.size ())
550	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
551	else
552	{
553	if (dst)
554	{	689	{
555	// unicast	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
556	if (dst != THISNODE->id)	691	exit (EXIT_FAILURE);
557	conns[dst - 1]->inject_data_packet (pkt);
558	}	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);
559	else	702	else
560	{
561	// broadcast, this is ugly, but due to the security policy
562	// we have to connect to all hosts...
563	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
564	if ((*c)->conf != THISNODE)
565	(*c)->inject_data_packet (pkt);	703	inject_data_packet (pkt, dst);
566	}
567	}	704	}
568		705
569	delete pkt;	706	delete pkt;
570	}	707	}
571	else if (revents & (POLLHUP \| POLLERR))
572	{
573	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
574	exit (1);
575	}
576	else	708	else
577	abort ();	709	abort ();
578	}	710	}
579		711
580	void	712	inline void
581	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
582	{	714	{
583	if (events)	715	if (events)
584	{	716	{
585	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
586	{	718	{
587	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
588		720
589	shutdown_all ();	721	shutdown_all ();
590
591	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
592
593	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
594		724	exit (EXIT_SUCCESS);
595	exit (0);
596	}	725	}
597		726
598	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
599	{	728	{
600	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
601		730
602	reconnect_all ();	731	reconnect_all ();
603	}	732	}
604		733
605	events = 0;	734	events = 0;
606	}	735	}
607
608	w.at = TSTAMP_CANCEL;
609	}	736	}
610		737
611	void	738	void
612	vpn::shutdown_all ()	739	vpn::shutdown_all ()
613	{	740	{
…		…
623		750
624	conns.clear ();	751	conns.clear ();
625		752
626	connection_init ();	753	connection_init ();
627		754
628	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
629	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
630	{
631	connection *conn = new connection (this);
632		757
633	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
634	conns.push_back (conn);
635
636	conn->establish_connection ();	759	(*c)->establish_connection ();
637	}
638	}	760	}
639		761
640	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
641	{	763	{
642	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	{
643	connection *router = 0;	775	connection *router = 0;
644		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	{
645	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
646	{	825	{
647	connection c = i;	826	connection o = i;
648		827
649	if (c->conf->routerprio > prio	828	if (!o->is_direct
650	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	829	&& o->si.valid ()
651	&& c->ictx && c->octx	830	&& c->si != o->si
652	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	831	&& c == find_router_for (o))
653	{
654	prio = c->conf->routerprio;
655	router = c;
656	}	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	}
657	}	837	}
658
659	return router;
660	}	838	}
661		839
662	void vpn::send_connect_request (int id)	840	void vpn::send_connect_request (connection *c)
663	{	841	{
664	connection *c = find_router ();	842	connection *r = find_router_for (c);
665		843
666	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);
667	c->send_connect_request (id);	848	r->send_connect_request (c->conf->id);
		849	}
668	else	850	else
669	// 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."),
670	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	c->conf->nodename);
671	if ((i)->conf->routerprio && (i)->conf != THISNODE)
672	(*i)->establish_connection ();
673	}	853	}
674		854
675	void	855	void
676	connection::dump_status ()	856	connection::dump_status ()
677	{	857	{
678	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
679	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
680	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
681	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"),
682	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
683	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
684	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
685	}	863	}
686		864
687	void	865	void
688	vpn::dump_status ()	866	vpn::dump_status ()
689	{	867	{
690	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
691		869
692	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
693	(*c)->dump_status ();	871	(*c)->dump_status ();
694		872
695	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
696	}	874	}
697		875
698	vpn::vpn (void)	876	vpn::vpn (void)
		877	{
699	: event (this, &vpn::event_cb)	878	event .set<vpn, &vpn::event_cb > (this);
700	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
701	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
702	#if ENABLE_TCP	881	#if ENABLE_TCP
703	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
704	#endif	883	#endif
705	#if ENABLE_ICMP	884	#if ENABLE_ICMP
706	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
707	#endif	886	#endif
708	, tap_ev_watcher (this, &vpn::tap_ev)	887	#if ENABLE_DNS
709	{	888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
710	}	891	}
711		892
712	vpn::~vpn ()	893	vpn::~vpn ()
713	{	894	{
714	}	895	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.16 by pcg, Tue Oct 14 19:59:16 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 1.16 by pcg, Tue Oct 14 19:59:16 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC