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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC vs.
Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	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
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	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
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	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
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
46		56
47	vpn network; // THE vpn (bad design...)	57	vpn network; // THE vpn (bad design...)
48		58
49	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
50		60
51	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 ()
52	{	75	{
53	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
54	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
55	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
59		82
60	char *env;	83	char *env;
61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);	87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67	asprintf (&env, "MTU=%d", mtu); putenv (env);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
70	THISNODE->id & 0xff);
71	putenv (env);
72		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,
73	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;
74	}	145	}
75		146
76	int	147	int
77	vpn::setup ()	148	vpn::setup ()
78	{	149	{
		150	int success = 0;
		151
		152	ipv4_tos = -1;
79	ipv4_fd = -1;	153	ipv4_fd = -1;
80		154
81	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
82	{	156	{
83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
84		158
85	if (ipv4_fd < 0)	159	if (ipv4_fd < 0)
86	return -1;	160	return -1;
87
88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
89		161
90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
91	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
92	// 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
93	// fragment for me sometimes.	165	// fragment for me sometimes.
…		…
99		171
100	sockinfo si (THISNODE, PROT_IPv4);	172	sockinfo si (THISNODE, PROT_IPv4);
101		173
102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
103	{	175	{
104	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));
105	exit (EXIT_FAILURE);	177	return -1;
106	}	178	}
107		179
108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
109	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
110		185
		186	udpv4_tos = -1;
111	udpv4_fd = -1;	187	udpv4_fd = -1;
112		188
113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
114	{	190	{
115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
116		192
117	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
118	return -1;	194	return -1;
119
120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
121		195
122	// standard daemon practise...	196	// standard daemon practise...
123	{	197	{
124	int oval = 1;	198	int oval = 1;
125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
137		211
138	sockinfo si (THISNODE, PROT_UDPv4);	212	sockinfo si (THISNODE, PROT_UDPv4);
139		213
140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
141	{	215	{
142	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));
143	exit (EXIT_FAILURE);	217	return -1;
144	}	218	}
145		219
146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
147	}	222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
148		225
		226	icmpv4_tos = -1;
149	icmpv4_fd = -1;	227	icmpv4_fd = -1;
150		228
151	#if ENABLE_ICMP	229	#if ENABLE_ICMP
152	if (THISNODE->protocols & PROT_ICMPv4)	230	if (THISNODE->protocols & PROT_ICMPv4)
153	{	231	{
154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
155		233
156	if (icmpv4_fd < 0)	234	if (icmpv4_fd < 0)
157	return -1;	235	return -1;
158
159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
160		236
161	#ifdef ICMP_FILTER	237	#ifdef ICMP_FILTER
162	{	238	{
163	icmp_filter oval;	239	icmp_filter oval;
164	oval.data = 0xffffffff;	240	oval.data = 0xffffffff;
…		…
173	// this I really consider a linux bug. I am neither connected	249	// this I really consider a linux bug. I am neither connected
174	// 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
175	// fragment for me sometimes.	251	// fragment for me sometimes.
176	{	252	{
177	int oval = IP_PMTUDISC_DONT;	253	int oval = IP_PMTUDISC_DONT;
178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
179	}	255	}
180	#endif	256	#endif
181		257
182	sockinfo si (THISNODE, PROT_ICMPv4);	258	sockinfo si (THISNODE, PROT_ICMPv4);
183		259
184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
185	{	261	{
186	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));
187	exit (EXIT_FAILURE);	263	return -1;
188	}	264	}
189		265
190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);	266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
191	}	268	}
192	#endif	269	#endif
193		270
194	tcpv4_fd = -1;	271	tcpv4_fd = -1;
195		272
196	#if ENABLE_TCP	273	#if ENABLE_TCP
197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
198	{	275	{
199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
200		277
201	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
202	return -1;	279	return -1;
203		280
204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
205
206	// standard daemon practise...	281	// standard daemon practise...
207	{	282	{
208	int oval = 1;	283	int oval = 1;
209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	284	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
210	}	285	}
211		286
212	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
213		288
214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
215	{	290	{
216	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));
217	exit (EXIT_FAILURE);	292	return -1;
218	}	293	}
219		294
220	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
221	{	296	{
222	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));
223	exit (EXIT_FAILURE);	298	return -1;
224	}	299	}
225		300
226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);	301	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		302	++success;
227	}	303	}
		304	else
		305	THISNODE->protocols &= ~PROT_TCPv4;
228	#endif	306	#endif
		307
		308	dnsv4_tos = -1;
		309	dnsv4_fd = -1;
229		310
230	#if ENABLE_DNS	311	#if ENABLE_DNS
231	if (THISNODE->protocols & PROT_DNSv4)	312	if (THISNODE->protocols & PROT_DNSv4)
232	{	313	{
233	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);	314	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
234		315
235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	316	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
236		317
237	if (dnsv4_fd < 0)	318	if (dnsv4_fd < 0)
238	return -1;	319	return -1;
239		320
240	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	321	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
241	// this I really consider a linux bug. I am neither connected	322	// this I really consider a linux bug. I am neither connected
242	// nor do I fragment myself. Linux still sets DF and doesn't	323	// nor do I fragment myself. Linux still sets DF and doesn't
243	// fragment for me sometimes.	324	// fragment for me sometimes.
244	{	325	{
245	int oval = IP_PMTUDISC_DONT;	326	int oval = IP_PMTUDISC_DONT;
246	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	327	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
247	}	328	}
248	#endif	329	# endif
249		330
250	// standard daemon practise...	331	// standard daemon practise...
251	{	332	{
252	int oval = 1;	333	int oval = 1;
253	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	334	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
257	THISNODE->dns_hostname ? THISNODE->dns_port : 0,	338	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
258	PROT_DNSv4);	339	PROT_DNSv4);
259		340
260	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))	341	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
261	{	342	{
262	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));	343	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
263	exit (EXIT_FAILURE);	344	return -1;
264	}	345	}
265		346
266	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);	347	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		348	++success;
		349	}
		350	#endif
		351
		352	/////////////////////////////////////////////////////////////////////////////
		353
		354	if (!success)
267	}	355	{
268	#endif	356	slog (L_ERR, _("no protocols enabled."));
		357	return -1;
		358	}
		359
		360	reconnect_all ();
		361
		362	/////////////////////////////////////////////////////////////////////////////
269		363
270	tap = new tap_device ();	364	tap = new tap_device ();
271	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
272	{	366	{
273	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
274	exit (EXIT_FAILURE);	368	return -1;
275	}	369	}
276		370
277	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
278		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
279	tap_ev_watcher.start (tap->fd, EVENT_READ);	391	tap_ev_watcher.start (tap->fd, EV_READ);
280
281	reconnect_all ();
282		392
283	return 0;	393	return 0;
284	}	394	}
285		395
286	bool	396	bool
287	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)
288	{	398	{
289	#if defined(SOL_IP) && defined(IP_TOS)	399	set_tos (ipv4_fd, ipv4_tos, tos);
290	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
291	#endif
292	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 ());
293		401
294	return true;	402	return true;
295	}	403	}
296		404
…		…
319		427
320	#if ENABLE_ICMP	428	#if ENABLE_ICMP
321	bool	429	bool
322	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)
323	{	431	{
324	#if defined(SOL_IP) && defined(IP_TOS)
325	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
326	#endif
327
328	pkt->unshift_hdr (4);	432	pkt->unshift_hdr (4);
329		433
330	icmp_header hdr = (icmp_header )&((*pkt)[0]);	434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
331	hdr->type = ::conf.icmp_type;	435	hdr->type = ::conf.icmp_type;
332	hdr->code = 255;	436	hdr->code = 255;
333	hdr->checksum = 0;	437	hdr->checksum = 0;
334	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
335		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
336	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 ());
337		442
338	return true;	443	return true;
339	}	444	}
340	#endif	445	#endif
341		446
342	bool	447	bool
343	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)
344	{	449	{
345	#if defined(SOL_IP) && defined(IP_TOS)	450	set_tos (udpv4_fd, udpv4_tos, tos);
346	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
347	#endif
348	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 ());
349		452
350	return true;	453	return true;
351	}	454	}
352		455
…		…
363	{	466	{
364	// broadcast, this is ugly, but due to the security policy	467	// broadcast, this is ugly, but due to the security policy
365	// we have to connect to all hosts...	468	// we have to connect to all hosts...
366	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
367	if ((*c)->conf != THISNODE)	470	if ((*c)->conf != THISNODE)
368	(*c)->inject_data_packet (pkt, true);	471	(*c)->inject_data_packet (pkt);
369	}	472	}
370	}	473	}
371		474
372	void	475	void
373	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
374	{	477	{
375	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
376	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
377		480
378	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."),
379	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
380		483
381	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
382	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
383	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
384	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)."),
385	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
386	else if (dst > conns.size ())
387	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
388	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
389	else	489	else
390	{	490	{
391	connection *c = conns[src - 1];	491	connection *c = conns[src - 1];
392		492
393	if (dst == 0)	493	if (dst == 0)
394	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	494	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
395	c->conf->nodename, (const char *)rsi);	495	c->conf->nodename, (const char *)rsi);
396	else if (dst != THISNODE->id)	496	else if (dst != THISNODE->id)
397	{	497	{
398	if (THISNODE->routerprio)	498	if (THISNODE->routerprio)
399	// the tos setting gets lost here. who cares.	499	// the tos setting gets lost here. who cares.
400	conns[dst - 1]->inject_vpn_packet (pkt);	500	conns[dst - 1]->inject_vpn_packet (pkt);
401	else	501	else
402	slog (L_WARN,	502	slog (L_WARN,
403	_("%s(%s): forwarding request (=> %s), but we are no router"),	503	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
404	c->conf->nodename, (const char *)rsi,	504	c->conf->nodename, (const char *)rsi,
405	conns[dst - 1]->conf->nodename);	505	conns[dst - 1]->conf->nodename);
406	}	506	}
407	else	507	else
408	c->recv_vpn_packet (pkt, rsi);	508	c->recv_vpn_packet (pkt, rsi);
…		…
414	{	514	{
415	switch (si.prot)	515	switch (si.prot)
416	{	516	{
417	case PROT_IPv4:	517	case PROT_IPv4:
418	return send_ipv4_packet (pkt, si, tos);	518	return send_ipv4_packet (pkt, si, tos);
		519
419	case PROT_UDPv4:	520	case PROT_UDPv4:
420	return send_udpv4_packet (pkt, si, tos);	521	return send_udpv4_packet (pkt, si, tos);
		522
421	#if ENABLE_TCP	523	#if ENABLE_TCP
422	case PROT_TCPv4:	524	case PROT_TCPv4:
423	return send_tcpv4_packet (pkt, si, tos);	525	return send_tcpv4_packet (pkt, si, tos);
424	#endif	526	#endif
425	#if ENABLE_ICMP	527	#if ENABLE_ICMP
426	case PROT_ICMPv4:	528	case PROT_ICMPv4:
…		…
428	#endif	530	#endif
429	#if ENABLE_DNS	531	#if ENABLE_DNS
430	case PROT_DNSv4:	532	case PROT_DNSv4:
431	return send_dnsv4_packet (pkt, si, tos);	533	return send_dnsv4_packet (pkt, si, tos);
432	#endif	534	#endif
433
434	default:	535	default:
435	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);	536	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
436	}	537	}
437		538
438	return false;	539	return false;
439	}	540	}
440		541
441	void	542	inline void
442	vpn::ipv4_ev (io_watcher &w, short revents)	543	vpn::ipv4_ev (ev::io &w, int revents)
443	{	544	{
444	if (revents & EVENT_READ)	545	if (revents & EV_READ)
445	{	546	{
446	vpn_packet *pkt = new vpn_packet;	547	vpn_packet *pkt = new vpn_packet;
447	struct sockaddr_in sa;	548	struct sockaddr_in sa;
448	socklen_t sa_len = sizeof (sa);	549	socklen_t sa_len = sizeof (sa);
449	int len;	550	int len;
…		…
455	if (len > 0)	556	if (len > 0)
456	{	557	{
457	pkt->len = len;	558	pkt->len = len;
458		559
459	// raw sockets deliver the ipv4 header, but don't expect it on sends	560	// raw sockets deliver the ipv4 header, but don't expect it on sends
460	pkt->skip_hdr (IP_OVERHEAD);	561	pkt->skip_hdr (pkt->ipv4_hdr_len ());
461		562
462	recv_vpn_packet (pkt, si);	563	recv_vpn_packet (pkt, si);
463	}	564	}
464	else	565	else
465	{	566	{
466	// probably ECONNRESET or somesuch	567	// probably ECONNRESET or somesuch
467	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	568	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
468	}	569	}
469		570
470	delete pkt;	571	delete pkt;
471	}	572	}
472	else	573	else
473	{	574	{
474	slog (L_ERR,	575	slog (L_ERR,
475	_("FATAL: unknown revents %08x in socket, terminating\n"),	576	_("FATAL: unknown revents %08x in socket, exiting.\n"),
476	revents);	577	revents);
477	exit (EXIT_FAILURE);	578	exit (EXIT_FAILURE);
478	}	579	}
479	}	580	}
480		581
481	#if ENABLE_ICMP	582	#if ENABLE_ICMP
482	void	583	inline void
483	vpn::icmpv4_ev (io_watcher &w, short revents)	584	vpn::icmpv4_ev (ev::io &w, int revents)
484	{	585	{
485	if (revents & EVENT_READ)	586	if (revents & EV_READ)
486	{	587	{
487	vpn_packet *pkt = new vpn_packet;	588	vpn_packet *pkt = new vpn_packet;
488	struct sockaddr_in sa;	589	struct sockaddr_in sa;
489	socklen_t sa_len = sizeof (sa);	590	socklen_t sa_len = sizeof (sa);
490	int len;	591	int len;
…		…
502	if (hdr->type == ::conf.icmp_type	603	if (hdr->type == ::conf.icmp_type
503	&& hdr->code == 255)	604	&& hdr->code == 255)
504	{	605	{
505	// raw sockets deliver the ipv4, but don't expect it on sends	606	// raw sockets deliver the ipv4, but don't expect it on sends
506	// this is slow, but...	607	// this is slow, but...
507	pkt->skip_hdr (ICMP_OVERHEAD);	608	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
508		609
509	recv_vpn_packet (pkt, si);	610	recv_vpn_packet (pkt, si);
510	}	611	}
511	}	612	}
512	else	613	else
513	{	614	{
514	// probably ECONNRESET or somesuch	615	// probably ECONNRESET or somesuch
515	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	616	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
516	}	617	}
517		618
518	delete pkt;	619	delete pkt;
519	}	620	}
520	else	621	else
521	{	622	{
522	slog (L_ERR,	623	slog (L_ERR,
523	_("FATAL: unknown revents %08x in socket, terminating\n"),	624	_("FATAL: unknown revents %08x in socket, exiting.\n"),
524	revents);	625	revents);
525	exit (EXIT_FAILURE);	626	exit (EXIT_FAILURE);
526	}	627	}
527	}	628	}
528	#endif	629	#endif
529		630
530	void	631	inline void
531	vpn::udpv4_ev (io_watcher &w, short revents)	632	vpn::udpv4_ev (ev::io &w, int revents)
532	{	633	{
533	if (revents & EVENT_READ)	634	if (revents & EV_READ)
534	{	635	{
535	vpn_packet *pkt = new vpn_packet;	636	vpn_packet *pkt = new vpn_packet;
536	struct sockaddr_in sa;	637	struct sockaddr_in sa;
537	socklen_t sa_len = sizeof (sa);	638	socklen_t sa_len = sizeof (sa);
538	int len;	639	int len;
…		…
548	recv_vpn_packet (pkt, si);	649	recv_vpn_packet (pkt, si);
549	}	650	}
550	else	651	else
551	{	652	{
552	// probably ECONNRESET or somesuch	653	// probably ECONNRESET or somesuch
553	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	654	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
554	}	655	}
555		656
556	delete pkt;	657	delete pkt;
557	}	658	}
558	else	659	else
559	{	660	{
560	slog (L_ERR,	661	slog (L_ERR,
561	_("FATAL: unknown revents %08x in socket, terminating\n"),	662	_("FATAL: unknown revents %08x in socket, exiting.\n"),
562	revents);	663	revents);
563	exit (EXIT_FAILURE);	664	exit (EXIT_FAILURE);
564	}	665	}
565	}	666	}
566		667
567	void	668	inline void
568	vpn::tap_ev (io_watcher &w, short revents)	669	vpn::tap_ev (ev::io &w, int revents)
569	{	670	{
570	if (revents & EVENT_READ)	671	if (revents & EV_READ)
571	{	672	{
572	/* process data */	673	/* process data */
573	tap_packet *pkt;	674	tap_packet *pkt;
574		675
575	pkt = tap->recv ();	676	pkt = tap->recv ();
…		…
604	}	705	}
605	else	706	else
606	abort ();	707	abort ();
607	}	708	}
608		709
609	void	710	inline void
610	vpn::event_cb (time_watcher &w)	711	vpn::event_cb (ev::timer &w, int)
611	{	712	{
612	if (events)	713	if (events)
613	{	714	{
614	if (events & EVENT_SHUTDOWN)	715	if (events & EVENT_SHUTDOWN)
615	{	716	{
616	slog (L_INFO, _("preparing shutdown..."));	717	slog (L_INFO, _("preparing shutdown..."));
617		718
618	shutdown_all ();	719	shutdown_all ();
619	remove_pid (conf.pidfilename);	720	remove_pid (conf.pidfilename);
620	slog (L_INFO, _("terminating"));	721	slog (L_INFO, _("exiting."));
621	exit (EXIT_SUCCESS);	722	exit (EXIT_SUCCESS);
622	}	723	}
623		724
624	if (events & EVENT_RECONNECT)	725	if (events & EVENT_RECONNECT)
625	{	726	{
626	slog (L_INFO, _("forced reconnect"));	727	slog (L_INFO, _("forced reconnect."));
627		728
628	reconnect_all ();	729	reconnect_all ();
629	}	730	}
630		731
631	events = 0;	732	events = 0;
…		…
647		748
648	conns.clear ();	749	conns.clear ();
649		750
650	connection_init ();	751	connection_init ();
651		752
652	for (configuration::node_vector::iterator i = conf.nodes.begin ();	753	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
653	i != conf.nodes.end (); ++i)	754	conns.push_back (new connection (this, *i));
654	{	755
655	connection conn = new connection (this, i);	756	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
656	conns.push_back (conn);
657	conn->establish_connection ();	757	(*c)->establish_connection ();
658	}
659	}	758	}
660		759
661	connection *vpn::find_router ()	760	bool
		761	vpn::can_direct (conf_node src, conf_node dst) const
662	{	762	{
663	u32 prio = 1;	763	return src != dst
		764	&& src->may_direct (dst)
		765	&& dst->may_direct (src)
		766	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		767	\|\| (src->protocols & dst->connectable_protocols ()));
		768	}
		769
		770	// only works for indirect and routed connections: find a router
		771	// from THISNODE to dst
		772	connection *
		773	vpn::find_router_for (const connection *dst)
		774	{
664	connection *router = 0;	775	connection *router = 0;
665		776
		777	// first try to find a router with a direct connection, route there
		778	// regardless of any other considerations.
		779	{
		780	u32 prio = 1;
		781
		782	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		783	{
		784	connection c = i;
		785
		786	if (c->conf->routerprio > prio
		787	&& c->conf != THISNODE
		788	&& can_direct (c->conf, dst->conf)
		789	&& c->ictx && c->octx)
		790	{
		791	prio = c->conf->routerprio;
		792	router = c;
		793	}
		794	}
		795	}
		796
		797	if (router)
		798	return router;
		799
		800	// second try find the router with the highest priority, higher than ours
		801	{
		802	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		803
		804	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		805	{
		806	connection c = i;
		807
		808	if (c->conf->routerprio > prio
		809	&& c != dst
		810	&& c->conf != THISNODE
		811	&& c->ictx && c->octx)
		812	{
		813	prio = c->conf->routerprio;
		814	router = c;
		815	}
		816	}
		817	}
		818
		819	return router;
		820	}
		821
		822	void
		823	vpn::connection_established (connection *c)
		824	{
666	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
667	{	826	{
668	connection c = i;	827	connection o = i;
669		828
670	if (c->conf->routerprio > prio	829	if (!o->is_direct
671	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	830	&& o->si.valid ()
672	&& c->ictx && c->octx	831	&& c->si != o->si
673	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	832	&& c == find_router_for (o))
674	{
675	prio = c->conf->routerprio;
676	router = c;
677	}	833	{
		834	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		835	o->conf->nodename, c->conf->nodename);
		836	o->rekey ();
		837	}
678	}	838	}
679
680	return router;
681	}	839	}
682		840
		841	void
683	void vpn::send_connect_request (int id)	842	vpn::send_connect_request (connection *c)
684	{	843	{
685	connection *c = find_router ();	844	connection *r = find_router_for (c);
686		845
687	if (c)	846	if (r)
		847	{
		848	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		849	c->conf->nodename, r->conf->nodename);
688	c->send_connect_request (id);	850	r->send_connect_request (c->conf->id);
		851	}
689	else	852	else
690	// no router found, aggressively connect to all routers	853	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
691	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	854	c->conf->nodename);
692	if ((i)->conf->routerprio && (i)->conf != THISNODE)
693	(*i)->establish_connection ();
694	}	855	}
695		856
696	void	857	void
697	connection::dump_status ()	858	connection::dump_status ()
698	{	859	{
699	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	860	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
700	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	861	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
701	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	862	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
702	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	863	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
703	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	864	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
704	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
705	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
706	}	865	}
707		866
708	void	867	void
709	vpn::dump_status ()	868	vpn::dump_status ()
710	{	869	{
711	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	870	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
712		871
713	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	872	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
714	(*c)->dump_status ();	873	(*c)->dump_status ();
715		874
716	slog (L_NOTICE, _("END status dump"));	875	slog (L_NOTICE, _("END status dump"));
717	}	876	}
718		877
719	vpn::vpn (void)	878	vpn::vpn (void)
		879	{
720	: event (this, &vpn::event_cb)	880	event .set<vpn, &vpn::event_cb > (this);
721	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	881	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
722	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	882	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
723	#if ENABLE_TCP	883	#if ENABLE_TCP
724	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	884	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
725	#endif	885	#endif
726	#if ENABLE_ICMP	886	#if ENABLE_ICMP
727	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	887	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
728	#endif	888	#endif
729	#if ENABLE_DNS	889	#if ENABLE_DNS
730	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)	890	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
731	#endif	891	#endif
732	, tap_ev_watcher (this, &vpn::tap_ev)	892	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
733	{
734	}	893	}
735		894
736	vpn::~vpn ()	895	vpn::~vpn ()
737	{	896	{
738	}	897	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC vs. Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC vs.
Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC