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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.57 by root, Tue Feb 8 23:13:48 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 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008 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);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60	putenv (env);
61	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
62	putenv (env);
63	asprintf (&env, "NODEID=%d", THISNODE->id);
64	putenv (env);
65	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
66	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
68	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
71	THISNODE->id & 0xff);
72	putenv (env);
73		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,
74	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;
75	}	145	}
76		146
77	int	147	int
78	vpn::setup ()	148	vpn::setup ()
79	{	149	{
		150	int success = 0;
		151
		152	ipv4_tos = -1;
80	ipv4_fd = -1;	153	ipv4_fd = -1;
81		154
82	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
83	{	156	{
84	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
85		158
86	if (ipv4_fd < 0)	159	if (ipv4_fd < 0)
87	return -1;	160	return -1;
88
89	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
90		161
91	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
93	// 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
94	// fragment for me sometimes.	165	// fragment for me sometimes.
…		…
100		171
101	sockinfo si (THISNODE, PROT_IPv4);	172	sockinfo si (THISNODE, PROT_IPv4);
102		173
103	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
104	{	175	{
105	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));
106	exit (1);	177	return -1;
107	}	178	}
108		179
109	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
110	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
111		185
		186	udpv4_tos = -1;
112	udpv4_fd = -1;	187	udpv4_fd = -1;
113		188
114	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
115	{	190	{
116	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
117		192
118	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
119	return -1;	194	return -1;
120
121	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
122		195
123	// standard daemon practise...	196	// standard daemon practise...
124	{	197	{
125	int oval = 1;	198	int oval = 1;
126	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
138		211
139	sockinfo si (THISNODE, PROT_UDPv4);	212	sockinfo si (THISNODE, PROT_UDPv4);
140		213
141	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
142	{	215	{
143	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));
144	exit (1);	217	return -1;
145	}	218	}
146		219
147	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
148	}	222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
149		225
		226	icmpv4_tos = -1;
150	icmpv4_fd = -1;	227	icmpv4_fd = -1;
151		228
152	#if ENABLE_ICMP	229	#if ENABLE_ICMP
153	if (THISNODE->protocols & PROT_ICMPv4)	230	if (THISNODE->protocols & PROT_ICMPv4)
154	{	231	{
155	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
156		233
157	if (icmpv4_fd < 0)	234	if (icmpv4_fd < 0)
158	return -1;	235	return -1;
159
160	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
161		236
162	#ifdef ICMP_FILTER	237	#ifdef ICMP_FILTER
163	{	238	{
164	icmp_filter oval;	239	icmp_filter oval;
165	oval.data = 0xffffffff;	240	oval.data = 0xffffffff;
…		…
174	// this I really consider a linux bug. I am neither connected	249	// this I really consider a linux bug. I am neither connected
175	// 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
176	// fragment for me sometimes.	251	// fragment for me sometimes.
177	{	252	{
178	int oval = IP_PMTUDISC_DONT;	253	int oval = IP_PMTUDISC_DONT;
179	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
180	}	255	}
181	#endif	256	#endif
182		257
183	sockinfo si (THISNODE, PROT_ICMPv4);	258	sockinfo si (THISNODE, PROT_ICMPv4);
184		259
185	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
186	{	261	{
187	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));
188	exit (1);	263	return -1;
189	}	264	}
190		265
191	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
192	}	268	}
193	#endif	269	#endif
194		270
195	tcpv4_fd = -1;	271	tcpv4_fd = -1;
196		272
197	#if ENABLE_TCP	273	#if ENABLE_TCP
198	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
199	{	275	{
200	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
201		277
202	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
203	return -1;	279	return -1;
204
205	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
206		280
207	// standard daemon practise...	281	// standard daemon practise...
208	{	282	{
209	int oval = 1;	283	int oval = 1;
210	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	284	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
212		286
213	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
214		288
215	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
216	{	290	{
217	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));
218	exit (1);	292	return -1;
219	}	293	}
220		294
221	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
222	{	296	{
223	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));
224	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);
225	}	328	}
226
227	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
228	}
229	#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	/////////////////////////////////////////////////////////////////////////////
230		363
231	tap = new tap_device ();	364	tap = new tap_device ();
232	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
233	{	366	{
234	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
235	exit (1);	368	return -1;
236	}	369	}
237		370
238	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
239		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
240	tap_ev_watcher.start (tap->fd, POLLIN);	391	tap_ev_watcher.start (tap->fd, EV_READ);
241
242	reconnect_all ();
243		392
244	return 0;	393	return 0;
245	}
246
247	// send a vpn packet out to other hosts
248	bool
249	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
250	{
251	switch (si.prot)
252	{
253	case PROT_IPv4:
254	return send_ipv4_packet (pkt, si, tos);
255
256	case PROT_UDPv4:
257	return send_udpv4_packet (pkt, si, tos);
258
259	#if ENABLE_TCP
260	case PROT_TCPv4:
261	return send_tcpv4_packet (pkt, si, tos);
262	#endif
263
264	#if ENABLE_ICMP
265	case PROT_ICMPv4:
266	return send_icmpv4_packet (pkt, si, tos);
267	#endif
268
269	default:
270	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
271	return false;
272	}
273	}	394	}
274		395
275	bool	396	bool
276	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)
277	{	398	{
278	#if defined(SOL_IP) && defined(IP_TOS)	399	set_tos (ipv4_fd, ipv4_tos, tos);
279	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
280	#endif
281	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 ());
282		401
283	return true;	402	return true;
284	}	403	}
285		404
…		…
308		427
309	#if ENABLE_ICMP	428	#if ENABLE_ICMP
310	bool	429	bool
311	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)
312	{	431	{
313	#if defined(SOL_IP) && defined(IP_TOS)
314	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
315	#endif
316
317	pkt->unshift_hdr (4);	432	pkt->unshift_hdr (4);
318		433
319	icmp_header hdr = (icmp_header )&((*pkt)[0]);	434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
320	hdr->type = ::conf.icmp_type;	435	hdr->type = ::conf.icmp_type;
321	hdr->code = 255;	436	hdr->code = 255;
322	hdr->checksum = 0;	437	hdr->checksum = 0;
323	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
324		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
325	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 ());
326		442
327	return true;	443	return true;
328	}	444	}
329	#endif	445	#endif
330		446
331	bool	447	bool
332	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)
333	{	449	{
334	#if defined(SOL_IP) && defined(IP_TOS)	450	set_tos (udpv4_fd, udpv4_tos, tos);
335	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
336	#endif
337	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 ());
338		452
339	return true;	453	return true;
340	}	454	}
341		455
…		…
352	{	466	{
353	// broadcast, this is ugly, but due to the security policy	467	// broadcast, this is ugly, but due to the security policy
354	// we have to connect to all hosts...	468	// we have to connect to all hosts...
355	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
356	if ((*c)->conf != THISNODE)	470	if ((*c)->conf != THISNODE)
357	(*c)->inject_data_packet (pkt, true);	471	(*c)->inject_data_packet (pkt);
358	}	472	}
359	}	473	}
360		474
361	void	475	void
362	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
363	{	477	{
364	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
365	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
366		480
367	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."),
368	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
369		483
370	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
371	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
372	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
373	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)."),
374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
375	else if (dst > conns.size ())	489	else if (dst > conns.size ())
376	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)."),
377	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
378	else	492	else
379	{	493	{
380	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
381		495
382	if (dst == 0)	496	if (dst == 0)
383	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
384	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
385	else if (dst != THISNODE->id)	499	else if (dst != THISNODE->id)
386	{	500	{
387	if (THISNODE->routerprio)	501	if (THISNODE->routerprio)
388	// the tos setting gets lost here. who cares.	502	// the tos setting gets lost here. who cares.
389	conns[dst - 1]->inject_vpn_packet (pkt);	503	conns[dst - 1]->inject_vpn_packet (pkt);
390	else	504	else
391	slog (L_WARN,	505	slog (L_WARN,
392	_("%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?)."),
393	c->conf->nodename, (const char *)rsi,	507	c->conf->nodename, (const char *)rsi,
394	conns[dst - 1]->conf->nodename);	508	conns[dst - 1]->conf->nodename);
395	}	509	}
396	else	510	else
397	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
398	}	512	}
399	}	513	}
400		514
401	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
402	vpn::ipv4_ev (io_watcher &w, short revents)	546	vpn::ipv4_ev (ev::io &w, int revents)
403	{	547	{
404	if (revents & (POLLIN \| POLLERR))	548	if (revents & EV_READ)
405	{	549	{
406	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
407	struct sockaddr_in sa;	551	struct sockaddr_in sa;
408	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
409	int len;	553	int len;
…		…
414		558
415	if (len > 0)	559	if (len > 0)
416	{	560	{
417	pkt->len = len;	561	pkt->len = len;
418		562
419	// 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
420	// this is slow, but...
421	pkt->skip_hdr (IP_OVERHEAD);	564	pkt->skip_hdr (IP_OVERHEAD);
422		565
423	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
424	}	567	}
425	else	568	else
426	{	569	{
427	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
428	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	571	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
429	}	572	}
430		573
431	delete pkt;	574	delete pkt;
432	}	575	}
433	else if (revents & POLLHUP)
434	{
435	// this cannot ;) happen on udp sockets
436	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
437	exit (1);
438	}
439	else	576	else
440	{	577	{
441	slog (L_ERR,	578	slog (L_ERR,
442	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
443	revents);	580	revents);
444	exit (1);	581	exit (EXIT_FAILURE);
445	}	582	}
446	}	583	}
447		584
448	#if ENABLE_ICMP	585	#if ENABLE_ICMP
449	void	586	inline void
450	vpn::icmpv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
451	{	588	{
452	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
453	{	590	{
454	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
455	struct sockaddr_in sa;	592	struct sockaddr_in sa;
456	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
457	int len;	594	int len;
…		…
477	}	614	}
478	}	615	}
479	else	616	else
480	{	617	{
481	// probably ECONNRESET or somesuch	618	// probably ECONNRESET or somesuch
482	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	619	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
483	}	620	}
484		621
485	delete pkt;	622	delete pkt;
486	}	623	}
487	else if (revents & POLLHUP)
488	{
489	// this cannot ;) happen on udp sockets
490	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
491	exit (1);
492	}
493	else	624	else
494	{	625	{
495	slog (L_ERR,	626	slog (L_ERR,
496	_("FATAL: unknown revents %08x in socket, terminating\n"),	627	_("FATAL: unknown revents %08x in socket, exiting.\n"),
497	revents);	628	revents);
498	exit (1);	629	exit (EXIT_FAILURE);
499	}	630	}
500	}	631	}
501	#endif	632	#endif
502		633
503	void	634	inline void
504	vpn::udpv4_ev (io_watcher &w, short revents)	635	vpn::udpv4_ev (ev::io &w, int revents)
505	{	636	{
506	if (revents & (POLLIN \| POLLERR))	637	if (revents & EV_READ)
507	{	638	{
508	vpn_packet *pkt = new vpn_packet;	639	vpn_packet *pkt = new vpn_packet;
509	struct sockaddr_in sa;	640	struct sockaddr_in sa;
510	socklen_t sa_len = sizeof (sa);	641	socklen_t sa_len = sizeof (sa);
511	int len;	642	int len;
…		…
521	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
522	}	653	}
523	else	654	else
524	{	655	{
525	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
526	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));
527	}	658	}
528		659
529	delete pkt;	660	delete pkt;
530	}	661	}
531	else if (revents & POLLHUP)
532	{
533	// this cannot ;) happen on udp sockets
534	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
535	exit (1);
536	}
537	else	662	else
538	{	663	{
539	slog (L_ERR,	664	slog (L_ERR,
540	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
541	revents);	666	revents);
542	exit (1);	667	exit (EXIT_FAILURE);
543	}	668	}
544	}	669	}
545		670
546	void	671	inline void
547	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
548	{	673	{
549	if (revents & POLLIN)	674	if (revents & EV_READ)
550	{	675	{
551	/* process data */	676	/* process data */
552	tap_packet *pkt;	677	tap_packet *pkt;
553		678
554	pkt = tap->recv ();	679	pkt = tap->recv ();
…		…
561	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
562	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
563		688
564	if (src != THISNODE->id)	689	if (src != THISNODE->id)
565	{	690	{
566	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
567	exit (1);	692	exit (EXIT_FAILURE);
568	}	693	}
569		694
570	if (dst == THISNODE->id)	695	if (dst == THISNODE->id)
571	{	696	{
572	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	697	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
573	exit (1);	698	exit (EXIT_FAILURE);
574	}	699	}
575		700
576	if (dst > conns.size ())	701	if (dst > conns.size ())
577	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	702	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
578	else	703	else
579	inject_data_packet (pkt, dst);	704	inject_data_packet (pkt, dst);
580	}	705	}
581		706
582	delete pkt;	707	delete pkt;
583	}	708	}
584	else if (revents & (POLLHUP \| POLLERR))
585	{
586	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
587	exit (1);
588	}
589	else	709	else
590	abort ();	710	abort ();
591	}	711	}
592		712
593	void	713	inline void
594	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
595	{	715	{
596	if (events)	716	if (events)
597	{	717	{
598	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
599	{	719	{
600	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
601		721
602	shutdown_all ();	722	shutdown_all ();
603
604	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
605
606	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
607		725	exit (EXIT_SUCCESS);
608	exit (0);
609	}	726	}
610		727
611	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
612	{	729	{
613	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
614		731
615	reconnect_all ();	732	reconnect_all ();
616	}	733	}
617		734
618	events = 0;	735	events = 0;
619	}	736	}
620
621	w.at = TSTAMP_CANCEL;
622	}	737	}
623		738
624	void	739	void
625	vpn::shutdown_all ()	740	vpn::shutdown_all ()
626	{	741	{
…		…
636		751
637	conns.clear ();	752	conns.clear ();
638		753
639	connection_init ();	754	connection_init ();
640		755
641	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
642	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
643	{
644	connection *conn = new connection (this);
645		758
646	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
647	conns.push_back (conn);
648
649	conn->establish_connection ();	760	(*c)->establish_connection ();
650	}
651	}	761	}
652		762
653	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
654	{	765	{
655	u32 prio = 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	{
656	connection *router = 0;	778	connection *router = 0;
657		779
		780	// first try to find a router with a direct connection, route there
		781	// regardless of any other considerations.
		782	{
		783	u32 prio = 1;
		784
		785	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		786	{
		787	connection c = i;
		788
		789	if (c->conf->routerprio > prio
		790	&& c->conf != THISNODE
		791	&& can_direct (c->conf, dst->conf)
		792	&& c->ictx && c->octx)
		793	{
		794	prio = c->conf->routerprio;
		795	router = c;
		796	}
		797	}
		798	}
		799
		800	if (router)
		801	return router;
		802
		803	// second try find the router with the highest priority, higher than ours
		804	{
		805	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		806
		807	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		808	{
		809	connection c = i;
		810
		811	if (c->conf->routerprio > prio
		812	&& c != dst
		813	&& c->conf != THISNODE
		814	&& c->ictx && c->octx)
		815	{
		816	prio = c->conf->routerprio;
		817	router = c;
		818	}
		819	}
		820	}
		821
		822	return router;
		823	}
		824
		825	void
		826	vpn::connection_established (connection *c)
		827	{
658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
659	{	829	{
660	connection c = i;	830	connection o = i;
661		831
662	if (c->conf->routerprio > prio	832	if (!o->is_direct
663	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	833	&& o->si.valid ()
664	&& c->ictx && c->octx	834	&& c->si != o->si
665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	835	&& c == find_router_for (o))
666	{
667	prio = c->conf->routerprio;
668	router = c;
669	}	836	{
		837	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		838	o->conf->nodename, c->conf->nodename);
		839	o->rekey ();
		840	}
670	}	841	}
671
672	return router;
673	}	842	}
674		843
		844	void
675	void vpn::send_connect_request (int id)	845	vpn::send_connect_request (connection *c)
676	{	846	{
677	connection *c = find_router ();	847	connection *r = find_router_for (c);
678		848
679	if (c)	849	if (r)
		850	{
		851	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		852	c->conf->nodename, r->conf->nodename);
680	c->send_connect_request (id);	853	r->send_connect_request (c->conf->id);
		854	}
681	else	855	else
682	// no router found, aggressively connect to all routers	856	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	857	c->conf->nodename);
684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
685	(*i)->establish_connection ();
686	}	858	}
687		859
688	void	860	void
689	connection::dump_status ()	861	connection::dump_status ()
690	{	862	{
691	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
692	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
693	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
694	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	866	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
695	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
696	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
697	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
698	}	868	}
699		869
700	void	870	void
701	vpn::dump_status ()	871	vpn::dump_status ()
702	{	872	{
703	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
704		874
705	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
706	(*c)->dump_status ();	876	(*c)->dump_status ();
707		877
708	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
709	}	879	}
710		880
711	vpn::vpn (void)	881	vpn::vpn (void)
		882	{
712	: event (this, &vpn::event_cb)	883	event .set<vpn, &vpn::event_cb > (this);
713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
715	#if ENABLE_TCP	886	#if ENABLE_TCP
716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
717	#endif	888	#endif
718	#if ENABLE_ICMP	889	#if ENABLE_ICMP
719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	890	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
720	#endif	891	#endif
721	, tap_ev_watcher (this, &vpn::tap_ev)	892	#if ENABLE_DNS
722	{	893	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		894	#endif
		895	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
723	}	896	}
724		897
725	vpn::~vpn ()	898	vpn::~vpn ()
726	{	899	{
727	}	900	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs. Revision 1.57 by root, Tue Feb 8 23:13:48 2011 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.57 by root, Tue Feb 8 23:13:48 2011 UTC