[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 1.56 by root, Tue Feb 8 23:11:36 2011 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008 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	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, POLLIN);	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, POLLIN);	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, POLLIN);	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 (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;
		299	}
		300
		301	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		302	++success;
		303	}
		304	else
		305	THISNODE->protocols &= ~PROT_TCPv4;
		306	#endif
		307
		308	dnsv4_tos = -1;
		309	dnsv4_fd = -1;
		310
		311	#if ENABLE_DNS
		312	if (THISNODE->protocols & PROT_DNSv4)
		313	{
		314	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		315
		316	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		317
		318	if (dnsv4_fd < 0)
		319	return -1;
		320
		321	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		322	// this I really consider a linux bug. I am neither connected
		323	// nor do I fragment myself. Linux still sets DF and doesn't
		324	// fragment for me sometimes.
		325	{
		326	int oval = IP_PMTUDISC_DONT;
		327	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
222	}	328	}
223
224	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
225	}
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, POLLIN);	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;
		454	}
		455
		456	void
		457	vpn::inject_data_packet (tap_packet *pkt, int dst)
		458	{
		459	if (dst)
		460	{
		461	// unicast
		462	if (dst != THISNODE->id)
		463	conns[dst - 1]->inject_data_packet (pkt);
		464	}
		465	else
		466	{
		467	// broadcast, this is ugly, but due to the security policy
		468	// we have to connect to all hosts...
		469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		470	if ((*c)->conf != THISNODE)
		471	(*c)->inject_data_packet (pkt);
		472	}
337	}	473	}
338		474
339	void	475	void
340	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
341	{	477	{
342	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
343	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
344		480
345	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."),
346	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
347		483
348	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
349	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
350	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
351	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)."),
352	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
353	else if (dst > conns.size ())	489	else if (dst > conns.size ())
354	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)."),
355	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
356	else	492	else
357	{	493	{
358	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
359		495
360	if (dst == 0)	496	if (dst == 0)
361	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
362	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
363	else if (dst != 0 && dst != THISNODE->id)	499	else if (dst != THISNODE->id)
364	{	500	{
365	if (THISNODE->routerprio)	501	if (THISNODE->routerprio)
366	// the tos setting gets lost here. who cares.	502	// the tos setting gets lost here. who cares.
367	conns[dst - 1]->inject_vpn_packet (pkt);	503	conns[dst - 1]->inject_vpn_packet (pkt);
368	else	504	else
369	slog (L_WARN,	505	slog (L_WARN,
370	_("%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?)."),
371	c->conf->nodename, (const char *)rsi,	507	c->conf->nodename, (const char *)rsi,
372	conns[dst - 1]->conf->nodename);	508	conns[dst - 1]->conf->nodename);
373	}	509	}
374	else	510	else
375	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
376	}	512	}
377	}	513	}
378		514
379	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
380	vpn::ipv4_ev (io_watcher &w, short revents)	546	vpn::ipv4_ev (ev::io &w, int revents)
381	{	547	{
382	if (revents & (POLLIN \| POLLERR))	548	if (revents & EV_READ)
383	{	549	{
384	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
385	struct sockaddr_in sa;	551	struct sockaddr_in sa;
386	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
387	int len;	553	int len;
…		…
392		558
393	if (len > 0)	559	if (len > 0)
394	{	560	{
395	pkt->len = len;	561	pkt->len = len;
396		562
397	// 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
398	// this is slow, but...
399	pkt->skip_hdr (IP_OVERHEAD);	564	pkt->skip_hdr (IP_OVERHEAD);
400		565
401	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
402	}	567	}
403	else	568	else
404	{	569	{
405	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
406	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	571	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
407	}	572	}
408		573
409	delete pkt;	574	delete pkt;
410	}	575	}
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	576	else
418	{	577	{
419	slog (L_ERR,	578	slog (L_ERR,
420	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
421	revents);	580	revents);
422	exit (1);	581	exit (EXIT_FAILURE);
423	}	582	}
424	}	583	}
425		584
426	#if ENABLE_ICMP	585	#if ENABLE_ICMP
427	void	586	inline void
428	vpn::icmpv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
429	{	588	{
430	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
431	{	590	{
432	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
433	struct sockaddr_in sa;	592	struct sockaddr_in sa;
434	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
435	int len;	594	int len;
…		…
455	}	614	}
456	}	615	}
457	else	616	else
458	{	617	{
459	// probably ECONNRESET or somesuch	618	// probably ECONNRESET or somesuch
460	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	619	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
461	}	620	}
462		621
463	delete pkt;	622	delete pkt;
464	}	623	}
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	624	else
472	{	625	{
473	slog (L_ERR,	626	slog (L_ERR,
474	_("FATAL: unknown revents %08x in socket, terminating\n"),	627	_("FATAL: unknown revents %08x in socket, exiting.\n"),
475	revents);	628	revents);
476	exit (1);	629	exit (EXIT_FAILURE);
477	}	630	}
478	}	631	}
479	#endif	632	#endif
480		633
481	void	634	inline void
482	vpn::udpv4_ev (io_watcher &w, short revents)	635	vpn::udpv4_ev (ev::io &w, int revents)
483	{	636	{
484	if (revents & (POLLIN \| POLLERR))	637	if (revents & EV_READ)
485	{	638	{
486	vpn_packet *pkt = new vpn_packet;	639	vpn_packet *pkt = new vpn_packet;
487	struct sockaddr_in sa;	640	struct sockaddr_in sa;
488	socklen_t sa_len = sizeof (sa);	641	socklen_t sa_len = sizeof (sa);
489	int len;	642	int len;
…		…
499	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
500	}	653	}
501	else	654	else
502	{	655	{
503	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
504	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));
505	}	658	}
506		659
507	delete pkt;	660	delete pkt;
508	}	661	}
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	662	else
516	{	663	{
517	slog (L_ERR,	664	slog (L_ERR,
518	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
519	revents);	666	revents);
520	exit (1);	667	exit (EXIT_FAILURE);
521	}	668	}
522	}	669	}
523		670
524	void	671	inline void
525	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
526	{	673	{
527	if (revents & POLLIN)	674	if (revents & EV_READ)
528	{	675	{
529	/* process data */	676	/* process data */
530	tap_packet *pkt;	677	tap_packet *pkt;
531		678
532	pkt = tap->recv ();	679	pkt = tap->recv ();
533		680
		681	if (!pkt)
		682	return;
		683
		684	if (pkt->len > 14)
		685	{
534	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
535	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
536		688
537	if (src != THISNODE->id)	689	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	{	690	{
555	// unicast	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
556	if (dst != THISNODE->id)	692	exit (EXIT_FAILURE);
557	conns[dst - 1]->inject_data_packet (pkt);
558	}	693	}
		694
		695	if (dst == THISNODE->id)
		696	{
		697	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		698	exit (EXIT_FAILURE);
		699	}
		700
		701	if (dst > conns.size ())
		702	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
559	else	703	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);	704	inject_data_packet (pkt, dst);
566	}
567	}	705	}
568		706
569	delete pkt;	707	delete pkt;
570	}
571	else if (revents & (POLLHUP \| POLLERR))
572	{
573	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
574	exit (1);
575	}	708	}
576	else	709	else
577	abort ();	710	abort ();
578	}	711	}
579		712
580	void	713	inline void
581	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
582	{	715	{
583	if (events)	716	if (events)
584	{	717	{
585	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
586	{	719	{
587	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
588		721
589	shutdown_all ();	722	shutdown_all ();
590
591	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
592
593	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
594		725	exit (EXIT_SUCCESS);
595	exit (0);
596	}	726	}
597		727
598	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
599	{	729	{
600	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
601		731
602	reconnect_all ();	732	reconnect_all ();
603	}	733	}
604		734
605	events = 0;	735	events = 0;
606	}	736	}
607
608	w.at = TSTAMP_CANCEL;
609	}	737	}
610		738
611	void	739	void
612	vpn::shutdown_all ()	740	vpn::shutdown_all ()
613	{	741	{
…		…
623		751
624	conns.clear ();	752	conns.clear ();
625		753
626	connection_init ();	754	connection_init ();
627		755
628	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
629	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
630	{
631	connection *conn = new connection (this);
632		758
633	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
634	conns.push_back (conn);
635
636	conn->establish_connection ();	760	(*c)->establish_connection ();
637	}
638	}	761	}
639		762
640	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
641	{	765	{
642	u32 prio = 1;	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	{
643	connection *router = 0;	778	connection *router = 0;
644		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	{
645	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
646	{	829	{
647	connection c = i;	830	connection o = i;
648		831
649	if (c->conf->routerprio > prio	832	if (!o->is_direct
650	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	833	&& o->si.valid ()
651	&& c->ictx && c->octx	834	&& c->si != o->si
652	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	835	&& c == find_router_for (o))
653	{
654	prio = c->conf->routerprio;
655	router = c;
656	}	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	}
657	}	841	}
658
659	return router;
660	}	842	}
661		843
		844	void
662	void vpn::send_connect_request (int id)	845	vpn::send_connect_request (connection *c)
663	{	846	{
664	connection *c = find_router ();	847	connection *r = find_router_for (c);
665		848
666	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);
667	c->send_connect_request (id);	853	r->send_connect_request (c->conf->id);
		854	}
668	else	855	else
669	// 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."),
670	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	857	c->conf->nodename);
671	if ((i)->conf->routerprio && (i)->conf != THISNODE)
672	(*i)->establish_connection ();
673	}	858	}
674		859
675	void	860	void
676	connection::dump_status ()	861	connection::dump_status ()
677	{	862	{
678	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
679	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
680	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
681	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"),
682	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(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	}	868	}
686		869
687	void	870	void
688	vpn::dump_status ()	871	vpn::dump_status ()
689	{	872	{
690	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
691		874
692	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
693	(*c)->dump_status ();	876	(*c)->dump_status ();
694		877
695	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
696	}	879	}
697		880
698	vpn::vpn (void)	881	vpn::vpn (void)
		882	{
699	: event (this, &vpn::event_cb)	883	event .set<vpn, &vpn::event_cb > (this);
700	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
701	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
702	#if ENABLE_TCP	886	#if ENABLE_TCP
703	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
704	#endif	888	#endif
705	#if ENABLE_ICMP	889	#if ENABLE_ICMP
706	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	890	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
707	#endif	891	#endif
708	, tap_ev_watcher (this, &vpn::tap_ev)	892	#if ENABLE_DNS
709	{	893	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		894	#endif
		895	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
710	}	896	}
711		897
712	vpn::~vpn ()	898	vpn::~vpn ()
713	{	899	{
714	}	900	}

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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 1.56 by root, Tue Feb 8 23:11:36 2011 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 1.56 by root, Tue Feb 8 23:11:36 2011 UTC