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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC vs.
Revision 1.67 by root, Fri Oct 11 04:07:24 2013 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) 2003-2008,2010,2011,2013 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>
28	#include <cstdlib>	38	#include <cstdlib>
29		39
30	#include <sys/types.h>	40	#include <sys/types.h>
31	#include <sys/socket.h>	41	#include <sys/socket.h>
32	#include <sys/wait.h>	42	#include <sys/wait.h>
		43	#include <sys/stat.h>
33	#include <errno.h>	44	#include <errno.h>
34	#include <time.h>	45	#include <time.h>
35	#include <unistd.h>	46	#include <unistd.h>
36	#include <fcntl.h>	47	#include <fcntl.h>
37	#include <sys/socket.h>	48	#include <sys/socket.h>
…		…
42		53
43	#include "connection.h"	54	#include "connection.h"
44	#include "util.h"	55	#include "util.h"
45	#include "vpn.h"	56	#include "vpn.h"
46		57
		58	using namespace std;
		59
47	vpn network; // THE vpn (bad design...)	60	vpn network; // THE vpn (bad design...)
48		61
49	/////////////////////////////////////////////////////////////////////////////	62	/////////////////////////////////////////////////////////////////////////////
		63
		64	static void inline
		65	set_tos (int fd, int &tos_prev, int tos)
		66	{
		67	#if defined(SOL_IP) && defined(IP_TOS)
		68	if (tos_prev == tos)
		69	return;
		70
		71	tos_prev = tos;
		72	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		73	#endif
		74	}
50		75
51	void	76	void
52	vpn::script_init_env ()	77	vpn::script_init_env ()
53	{	78	{
54	// the tunnel device mtu should be the physical mtu - overhead	79	// the tunnel device mtu should be the physical mtu - overhead
55	// the tricky part is rounding to the cipher key blocksize	80	// the tricky part is rounding to the cipher key blocksize
56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	81	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	82	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	83	mtu -= mtu % BLOCK_SIZE (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	84	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		85
61	char *env;	86	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);	87	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);	88	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
…		…
75	snprintf (ext, 16, "_%d", (*c)->conf->id);	100	snprintf (ext, 16, "_%d", (*c)->conf->id);
76	(*c)->script_init_env (ext);	101	(*c)->script_init_env (ext);
77	}	102	}
78	}	103	}
79		104
		105	inline const char *
80	const char *vpn::script_if_init ()	106	vpn::script_if_init ()
81	{	107	{
82	script_init_env ();	108	script_init_env ();
83		109
84	return tap->if_up ();	110	return tap->if_up ();
85	}	111	}
86		112
		113	inline const char *
87	const char *vpn::script_if_up ()	114	vpn::script_if_up ()
88	{	115	{
89	script_init_env ();	116	script_init_env ();
90		117
91	char *filename;	118	return conf.config_filename (::conf.script_if_up, "if-up");
92	asprintf (&filename,	119	}
93	"%s/%s",
94	confbase,
95	::conf.script_if_up ? ::conf.script_if_up : "if-up");
96		120
97	return filename;	121	int
		122	vpn::setup_socket (u8 prot, int family, int type, int proto)
		123	{
		124	int fd = socket (family, type, proto);
		125
		126	if (fd < 0)
		127	{
		128	slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
		129	return fd;
		130	}
		131
		132	fcntl (fd, F_SETFL, O_NONBLOCK);
		133	fcntl (fd, F_SETFD, FD_CLOEXEC);
		134
		135	#ifdef SO_MARK
		136	if (::conf.nfmark)
		137	if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark))
		138	slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno));
		139	#endif
		140
		141	return fd;
98	}	142	}
99		143
100	int	144	int
101	vpn::setup ()	145	vpn::setup ()
102	{	146	{
		147	int success = 0;
		148
		149	ipv4_tos = -1;
103	ipv4_fd = -1;	150	ipv4_fd = -1;
104		151
105	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	152	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
106	{	153	{
107	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	154	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
108		155
109	if (ipv4_fd < 0)	156	if (ipv4_fd < 0)
110	return -1;	157	return -1;
111
112	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
113		158
114	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	159	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
115	// this I really consider a linux bug. I am neither connected	160	// this I really consider a linux bug. I am neither connected
116	// nor do I fragment myself. Linux still sets DF and doesn't	161	// nor do I fragment myself. Linux still sets DF and doesn't
117	// fragment for me sometimes.	162	// fragment for me sometimes.
…		…
123		168
124	sockinfo si (THISNODE, PROT_IPv4);	169	sockinfo si (THISNODE, PROT_IPv4);
125		170
126	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	171	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
127	{	172	{
128	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	173	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
129	exit (EXIT_FAILURE);	174	return -1;
130	}	175	}
131		176
132	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);	177	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		178	++success;
133	}	179	}
		180	else
		181	THISNODE->protocols &= ~PROT_IPv4;
134		182
		183	udpv4_tos = -1;
135	udpv4_fd = -1;	184	udpv4_fd = -1;
136		185
137	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	186	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
138	{	187	{
139	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	188	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
140		189
141	if (udpv4_fd < 0)	190	if (udpv4_fd < 0)
142	return -1;	191	return -1;
143
144	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
145		192
146	// standard daemon practise...	193	// standard daemon practise...
147	{	194	{
148	int oval = 1;	195	int oval = 1;
149	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	196	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
161		208
162	sockinfo si (THISNODE, PROT_UDPv4);	209	sockinfo si (THISNODE, PROT_UDPv4);
163		210
164	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	211	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
165	{	212	{
166	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	213	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
167	exit (EXIT_FAILURE);	214	return -1;
168	}	215	}
169		216
170	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);	217	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		218	++success;
171	}	219	}
		220	else
		221	THISNODE->protocols &= ~PROT_UDPv4;
172		222
		223	icmpv4_tos = -1;
173	icmpv4_fd = -1;	224	icmpv4_fd = -1;
174		225
175	#if ENABLE_ICMP	226	#if ENABLE_ICMP
176	if (THISNODE->protocols & PROT_ICMPv4)	227	if (THISNODE->protocols & PROT_ICMPv4)
177	{	228	{
178	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	229	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
179		230
180	if (icmpv4_fd < 0)	231	if (icmpv4_fd < 0)
181	return -1;	232	return -1;
182
183	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
184		233
185	#ifdef ICMP_FILTER	234	#ifdef ICMP_FILTER
186	{	235	{
187	icmp_filter oval;	236	icmp_filter oval;
188	oval.data = 0xffffffff;	237	oval.data = 0xffffffff;
…		…
197	// this I really consider a linux bug. I am neither connected	246	// this I really consider a linux bug. I am neither connected
198	// nor do I fragment myself. Linux still sets DF and doesn't	247	// nor do I fragment myself. Linux still sets DF and doesn't
199	// fragment for me sometimes.	248	// fragment for me sometimes.
200	{	249	{
201	int oval = IP_PMTUDISC_DONT;	250	int oval = IP_PMTUDISC_DONT;
202	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	251	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
203	}	252	}
204	#endif	253	#endif
205		254
206	sockinfo si (THISNODE, PROT_ICMPv4);	255	sockinfo si (THISNODE, PROT_ICMPv4);
207		256
208	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	257	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
209	{	258	{
210	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	259	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
211	exit (EXIT_FAILURE);	260	return -1;
212	}	261	}
213		262
214	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);	263	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		264	++success;
215	}	265	}
216	#endif	266	#endif
217		267
218	tcpv4_fd = -1;	268	tcpv4_fd = -1;
219		269
220	#if ENABLE_TCP	270	#if ENABLE_TCP
221	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	271	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
222	{	272	{
223	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	273	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
224		274
225	if (tcpv4_fd < 0)	275	if (tcpv4_fd < 0)
226	return -1;	276	return -1;
227		277
228	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
229
230	// standard daemon practise...	278	// standard daemon practise...
231	{	279	{
232	int oval = 1;	280	int oval = 1;
233	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	281	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
234	}	282	}
235		283
236	sockinfo si (THISNODE, PROT_TCPv4);	284	sockinfo si (THISNODE, PROT_TCPv4);
237		285
238	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	286	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
239	{	287	{
240	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	288	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
241	exit (EXIT_FAILURE);	289	return -1;
242	}	290	}
243		291
244	if (listen (tcpv4_fd, 5))	292	if (listen (tcpv4_fd, 5))
245	{	293	{
246	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	294	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
247	exit (EXIT_FAILURE);	295	return -1;
248	}	296	}
249		297
250	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);	298	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		299	++success;
251	}	300	}
		301	else
		302	THISNODE->protocols &= ~PROT_TCPv4;
252	#endif	303	#endif
		304
		305	dnsv4_tos = -1;
		306	dnsv4_fd = -1;
253		307
254	#if ENABLE_DNS	308	#if ENABLE_DNS
255	if (THISNODE->protocols & PROT_DNSv4)	309	if (THISNODE->protocols & PROT_DNSv4)
256	{	310	{
257	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);	311	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
258		312
259	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	313	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
260		314
261	if (dnsv4_fd < 0)	315	if (dnsv4_fd < 0)
262	return -1;	316	return -1;
263		317
264	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	318	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
265	// this I really consider a linux bug. I am neither connected	319	// this I really consider a linux bug. I am neither connected
266	// nor do I fragment myself. Linux still sets DF and doesn't	320	// nor do I fragment myself. Linux still sets DF and doesn't
267	// fragment for me sometimes.	321	// fragment for me sometimes.
268	{	322	{
269	int oval = IP_PMTUDISC_DONT;	323	int oval = IP_PMTUDISC_DONT;
270	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	324	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
271	}	325	}
272	#endif	326	# endif
273		327
274	// standard daemon practise...	328	// standard daemon practise...
275	{	329	{
276	int oval = 1;	330	int oval = 1;
277	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	331	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
281	THISNODE->dns_hostname ? THISNODE->dns_port : 0,	335	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
282	PROT_DNSv4);	336	PROT_DNSv4);
283		337
284	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))	338	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
285	{	339	{
286	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));	340	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
287	exit (EXIT_FAILURE);	341	return -1;
288	}	342	}
289		343
290	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);	344	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		345	++success;
291	}	346	}
292	#endif	347	#endif
293		348
294	/////////////////////////////////////////////////////////////////////////////	349	/////////////////////////////////////////////////////////////////////////////
		350
		351	if (!success)
		352	{
		353	slog (L_ERR, _("no protocols enabled."));
		354	return -1;
		355	}
295		356
296	reconnect_all ();	357	reconnect_all ();
297		358
298	/////////////////////////////////////////////////////////////////////////////	359	/////////////////////////////////////////////////////////////////////////////
299		360
300	tap = new tap_device ();	361	tap = new tap_device ();
301	if (!tap) //D this, of course, never catches	362	if (!tap) //D this, of course, never catches
302	{	363	{
303	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	364	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
304	exit (EXIT_FAILURE);	365	return -1;
305	}	366	}
306		367
		368	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
		369
		370	run_script_cb cb;
		371	cb.set<vpn, &vpn::script_if_init> (this);
		372
307	if (tap->if_up () &&	373	if (tap->if_up () &&
308	!run_script (run_script_cb (this, &vpn::script_if_init), true))	374	!run_script (cb, true))
309	{	375	{
310	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),	376	slog (L_ERR, _("interface initialization command '%s' failed."),
311	tap->if_up ());	377	tap->if_up ());
312	exit (EXIT_FAILURE);	378	return -1;
313	}
314
315	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
316	{	379	}
		380
		381	cb.set<vpn, &vpn::script_if_up> (this);
		382	if (!run_script (cb, true))
		383	{
317	slog (L_ERR, _("if-up command execution failed, exiting."));	384	slog (L_ERR, _("if-up command execution failed."));
318	exit (EXIT_FAILURE);	385	return -1;
319	}	386	}
320		387
321	tap_ev_watcher.start (tap->fd, EVENT_READ);	388	tap_ev_watcher.start (tap->fd, EV_READ);
322		389
323	return 0;	390	return 0;
		391	}
		392
		393	bool
		394	vpn::drop_privileges ()
		395	{
		396	if (::conf.change_root)
		397	{
		398	if (!strcmp (::conf.change_root, "/"))
		399	{
		400	char dir [L_tmpnam];
		401	if (!tmpnam (dir))
		402	{
		403	slog (L_CRIT, _("unable to create anonymous root path."));
		404	return false;
		405	}
		406
		407	if (mkdir (dir, 0700))
		408	{
		409	slog (L_CRIT, _("unable to crate anonymous root directory."));
		410	return false;
		411	}
		412
		413	if (chdir (dir))
		414	{
		415	slog (L_CRIT, _("unable to change to anonymous root directory."));
		416	return false;
		417	}
		418
		419	if (rmdir (dir))
		420	slog (L_ERR, _("unable to remove anonymous root directory, continuing."));
		421	}
		422	else
		423	{
		424	if (chdir (::conf.change_root))
		425	{
		426	slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root);
		427	return false;
		428	}
		429	}
		430
		431	if (chroot ("."))
		432	{
		433	slog (L_CRIT, _("unable to set new root directory."));
		434	return false;
		435	}
		436
		437	if (chdir ("/"))
		438	{
		439	slog (L_CRIT, _("unable to set cwd to new root directory."));
		440	return false;
		441	}
		442	}
		443
		444	if (::conf.change_gid)
		445	if (setgid (::conf.change_gid))
		446	{
		447	slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid);
		448	return false;
		449	}
		450
		451	if (::conf.change_uid)
		452	if (setuid (::conf.change_uid))
		453	{
		454	slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid);
		455	return false;
		456	}
		457
		458	return true;
324	}	459	}
325		460
326	bool	461	bool
327	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	462	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
328	{	463	{
329	#if defined(SOL_IP) && defined(IP_TOS)	464	set_tos (ipv4_fd, ipv4_tos, tos);
330	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
331	#endif
332	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	465	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
333		466
334	return true;	467	return true;
335	}	468	}
336		469
…		…
359		492
360	#if ENABLE_ICMP	493	#if ENABLE_ICMP
361	bool	494	bool
362	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	495	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
363	{	496	{
364	#if defined(SOL_IP) && defined(IP_TOS)
365	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
366	#endif
367
368	pkt->unshift_hdr (4);	497	pkt->unshift_hdr (4);
369		498
370	icmp_header hdr = (icmp_header )&((*pkt)[0]);	499	icmp_header hdr = (icmp_header )&((*pkt)[0]);
371	hdr->type = ::conf.icmp_type;	500	hdr->type = ::conf.icmp_type;
372	hdr->code = 255;	501	hdr->code = 255;
373	hdr->checksum = 0;	502	hdr->checksum = 0;
374	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	503	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
375		504
		505	set_tos (icmpv4_fd, icmpv4_tos, tos);
376	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	506	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
377		507
378	return true;	508	return true;
379	}	509	}
380	#endif	510	#endif
381		511
382	bool	512	bool
383	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	513	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
384	{	514	{
385	#if defined(SOL_IP) && defined(IP_TOS)	515	set_tos (udpv4_fd, udpv4_tos, tos);
386	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
387	#endif
388	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	516	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
389		517
390	return true;	518	return true;
391	}	519	}
392		520
…		…
403	{	531	{
404	// broadcast, this is ugly, but due to the security policy	532	// broadcast, this is ugly, but due to the security policy
405	// we have to connect to all hosts...	533	// we have to connect to all hosts...
406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	534	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
407	if ((*c)->conf != THISNODE)	535	if ((*c)->conf != THISNODE)
408	(*c)->inject_data_packet (pkt, true);	536	(*c)->inject_data_packet (pkt);
409	}	537	}
410	}	538	}
411		539
412	void	540	void
413	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	541	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
414	{	542	{
415	unsigned int src = pkt->src ();	543	unsigned int src = pkt->src ();
416	unsigned int dst = pkt->dst ();	544	unsigned int dst = pkt->dst ();
417		545
418	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	546	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
419	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	547	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
420		548
421	if (src == 0 \|\| src > conns.size ()	549	if (src == 0 \|\| src > conns.size ()
422	\|\| dst > conns.size ()	550	\|\| dst > conns.size ()
423	\|\| pkt->typ () >= vpn_packet::PT_MAX)	551	\|\| pkt->typ () >= vpn_packet::PT_MAX)
424	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	552	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
425	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
426	else if (dst > conns.size ())
427	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
428	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	553	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
429	else	554	else
430	{	555	{
431	connection *c = conns[src - 1];	556	connection *c = conns[src - 1];
432		557
433	if (dst == 0)	558	if (dst == 0)
434	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	559	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
435	c->conf->nodename, (const char *)rsi);	560	c->conf->nodename, (const char *)rsi);
436	else if (dst != THISNODE->id)	561	else if (dst != THISNODE->id)
437	{	562	{
438	if (THISNODE->routerprio)	563	if (THISNODE->routerprio)
439	// the tos setting gets lost here. who cares.	564	// the tos setting gets lost here. who cares.
440	conns[dst - 1]->inject_vpn_packet (pkt);	565	conns[dst - 1]->inject_vpn_packet (pkt);
441	else	566	else
442	slog (L_WARN,	567	slog (L_WARN,
443	_("%s(%s): forwarding request (=> %s), but we are no router"),	568	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
444	c->conf->nodename, (const char *)rsi,	569	c->conf->nodename, (const char *)rsi,
445	conns[dst - 1]->conf->nodename);	570	conns[dst - 1]->conf->nodename);
446	}	571	}
447	else	572	else
448	c->recv_vpn_packet (pkt, rsi);	573	c->recv_vpn_packet (pkt, rsi);
…		…
453	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	578	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
454	{	579	{
455	switch (si.prot)	580	switch (si.prot)
456	{	581	{
457	case PROT_IPv4:	582	case PROT_IPv4:
458	return send_ipv4_packet (pkt, si, tos);	583	return send_ipv4_packet (pkt, si, tos);
		584
459	case PROT_UDPv4:	585	case PROT_UDPv4:
460	return send_udpv4_packet (pkt, si, tos);	586	return send_udpv4_packet (pkt, si, tos);
		587
461	#if ENABLE_TCP	588	#if ENABLE_TCP
462	case PROT_TCPv4:	589	case PROT_TCPv4:
463	return send_tcpv4_packet (pkt, si, tos);	590	return send_tcpv4_packet (pkt, si, tos);
464	#endif	591	#endif
465	#if ENABLE_ICMP	592	#if ENABLE_ICMP
466	case PROT_ICMPv4:	593	case PROT_ICMPv4:
467	return send_icmpv4_packet (pkt, si, tos);	594	return send_icmpv4_packet (pkt, si, tos);
468	#endif	595	#endif
469	#if ENABLE_DNS	596	#if ENABLE_DNS
470	case PROT_DNSv4:	597	case PROT_DNSv4:
471	return send_dnsv4_packet (pkt, si, tos);	598	return send_dnsv4_packet (pkt, si, tos);
472	#endif	599	#endif
473
474	default:	600	default:
475	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);	601	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
476	}	602	}
477		603
478	return false;	604	return false;
479	}	605	}
480		606
481	void	607	inline void
482	vpn::ipv4_ev (io_watcher &w, short revents)	608	vpn::ipv4_ev (ev::io &w, int revents)
483	{	609	{
484	if (revents & EVENT_READ)	610	if (revents & EV_READ)
485	{	611	{
486	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
487	struct sockaddr_in sa;	613	struct sockaddr_in sa;
488	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
489	int len;	615	int len;
…		…
495	if (len > 0)	621	if (len > 0)
496	{	622	{
497	pkt->len = len;	623	pkt->len = len;
498		624
499	// raw sockets deliver the ipv4 header, but don't expect it on sends	625	// raw sockets deliver the ipv4 header, but don't expect it on sends
500	pkt->skip_hdr (IP_OVERHEAD);	626	pkt->skip_hdr (pkt->ipv4_hdr_len ());
501		627
502	recv_vpn_packet (pkt, si);	628	recv_vpn_packet (pkt, si);
503	}	629	}
504	else	630	else
505	{	631	{
506	// probably ECONNRESET or somesuch	632	// probably ECONNRESET or somesuch
507	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	633	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
508	}	634	}
509		635
510	delete pkt;	636	delete pkt;
511	}	637	}
512	else	638	else
513	{	639	{
514	slog (L_ERR,	640	slog (L_ERR,
515	_("FATAL: unknown revents %08x in socket, terminating\n"),	641	_("FATAL: unknown revents %08x in socket, exiting.\n"),
516	revents);	642	revents);
517	exit (EXIT_FAILURE);	643	exit (EXIT_FAILURE);
518	}	644	}
519	}	645	}
520		646
521	#if ENABLE_ICMP	647	#if ENABLE_ICMP
522	void	648	inline void
523	vpn::icmpv4_ev (io_watcher &w, short revents)	649	vpn::icmpv4_ev (ev::io &w, int revents)
524	{	650	{
525	if (revents & EVENT_READ)	651	if (revents & EV_READ)
526	{	652	{
527	vpn_packet *pkt = new vpn_packet;	653	vpn_packet *pkt = new vpn_packet;
528	struct sockaddr_in sa;	654	struct sockaddr_in sa;
529	socklen_t sa_len = sizeof (sa);	655	socklen_t sa_len = sizeof (sa);
530	int len;	656	int len;
…		…
542	if (hdr->type == ::conf.icmp_type	668	if (hdr->type == ::conf.icmp_type
543	&& hdr->code == 255)	669	&& hdr->code == 255)
544	{	670	{
545	// raw sockets deliver the ipv4, but don't expect it on sends	671	// raw sockets deliver the ipv4, but don't expect it on sends
546	// this is slow, but...	672	// this is slow, but...
547	pkt->skip_hdr (ICMP_OVERHEAD);	673	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
548		674
549	recv_vpn_packet (pkt, si);	675	recv_vpn_packet (pkt, si);
550	}	676	}
551	}	677	}
552	else	678	else
553	{	679	{
554	// probably ECONNRESET or somesuch	680	// probably ECONNRESET or somesuch
555	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	681	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
556	}	682	}
557		683
558	delete pkt;	684	delete pkt;
559	}	685	}
560	else	686	else
561	{	687	{
562	slog (L_ERR,	688	slog (L_ERR,
563	_("FATAL: unknown revents %08x in socket, terminating\n"),	689	_("FATAL: unknown revents %08x in socket, exiting.\n"),
564	revents);	690	revents);
565	exit (EXIT_FAILURE);	691	exit (EXIT_FAILURE);
566	}	692	}
567	}	693	}
568	#endif	694	#endif
569		695
570	void	696	inline void
571	vpn::udpv4_ev (io_watcher &w, short revents)	697	vpn::udpv4_ev (ev::io &w, int revents)
572	{	698	{
573	if (revents & EVENT_READ)	699	if (revents & EV_READ)
574	{	700	{
575	vpn_packet *pkt = new vpn_packet;	701	vpn_packet *pkt = new vpn_packet;
576	struct sockaddr_in sa;	702	struct sockaddr_in sa;
577	socklen_t sa_len = sizeof (sa);	703	socklen_t sa_len = sizeof (sa);
578	int len;	704	int len;
…		…
588	recv_vpn_packet (pkt, si);	714	recv_vpn_packet (pkt, si);
589	}	715	}
590	else	716	else
591	{	717	{
592	// probably ECONNRESET or somesuch	718	// probably ECONNRESET or somesuch
593	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	719	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
594	}	720	}
595		721
596	delete pkt;	722	delete pkt;
597	}	723	}
598	else	724	else
599	{	725	{
600	slog (L_ERR,	726	slog (L_ERR,
601	_("FATAL: unknown revents %08x in socket, terminating\n"),	727	_("FATAL: unknown revents %08x in socket, exiting.\n"),
602	revents);	728	revents);
603	exit (EXIT_FAILURE);	729	exit (EXIT_FAILURE);
604	}	730	}
605	}	731	}
606		732
607	void	733	inline void
608	vpn::tap_ev (io_watcher &w, short revents)	734	vpn::tap_ev (ev::io &w, int revents)
609	{	735	{
610	if (revents & EVENT_READ)	736	if (revents & EV_READ)
611	{	737	{
612	/* process data */	738	/* process data */
613	tap_packet *pkt;	739	tap_packet *pkt;
614		740
615	pkt = tap->recv ();	741	pkt = tap->recv ();
…		…
644	}	770	}
645	else	771	else
646	abort ();	772	abort ();
647	}	773	}
648		774
649	void	775	inline void
650	vpn::event_cb (time_watcher &w)	776	vpn::event_cb (ev::timer &w, int)
651	{	777	{
652	if (events)	778	if (events)
653	{	779	{
654	if (events & EVENT_SHUTDOWN)	780	if (events & EVENT_SHUTDOWN)
655	{	781	{
656	slog (L_INFO, _("preparing shutdown..."));	782	slog (L_INFO, _("preparing shutdown..."));
657		783
658	shutdown_all ();	784	shutdown_all ();
659	remove_pid (conf.pidfilename);	785	remove_pid (conf.pidfilename);
660	slog (L_INFO, _("terminating"));	786	slog (L_INFO, _("exiting."));
661	exit (EXIT_SUCCESS);	787	exit (EXIT_SUCCESS);
662	}	788	}
663		789
664	if (events & EVENT_RECONNECT)	790	if (events & EVENT_RECONNECT)
665	{	791	{
666	slog (L_INFO, _("forced reconnect"));	792	slog (L_INFO, _("forced reconnect."));
667		793
668	reconnect_all ();	794	reconnect_all ();
669	}	795	}
670		796
671	events = 0;	797	events = 0;
…		…
687		813
688	conns.clear ();	814	conns.clear ();
689		815
690	connection_init ();	816	connection_init ();
691		817
692	for (configuration::node_vector::iterator i = conf.nodes.begin ();	818	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
693	i != conf.nodes.end (); ++i)	819	conns.push_back (new connection (this, *i));
694	{	820
695	connection conn = new connection (this, i);	821	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
696	conns.push_back (conn);
697	conn->establish_connection ();	822	(*c)->establish_connection ();
698	}
699	}	823	}
700		824
701	connection *vpn::find_router ()	825	bool
		826	vpn::can_direct (conf_node src, conf_node dst) const
702	{	827	{
703	u32 prio = 1;	828	return src != dst
		829	&& src->may_direct (dst)
		830	&& dst->may_direct (src)
		831	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		832	\|\| (src->protocols & dst->connectable_protocols ()));
		833	}
		834
		835	// only works for indirect and routed connections: find a router
		836	// from THISNODE to dst
		837	connection *
		838	vpn::find_router_for (const connection *dst)
		839	{
704	connection *router = 0;	840	connection *router = 0;
705		841
		842	// first try to find a router with a direct connection, route there
		843	// regardless of any other considerations.
		844	{
		845	u32 prio = 1;
		846
		847	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		848	{
		849	connection c = i;
		850
		851	if (c->conf->routerprio > prio
		852	&& c->conf != THISNODE
		853	&& can_direct (c->conf, dst->conf)
		854	&& c->ictx && c->octx)
		855	{
		856	prio = c->conf->routerprio;
		857	router = c;
		858	}
		859	}
		860	}
		861
		862	if (router)
		863	return router;
		864
		865	// second try find the router with the highest priority, higher than ours
		866	{
		867	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		868
		869	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		870	{
		871	connection c = i;
		872
		873	if (c->conf->routerprio > prio
		874	&& c != dst
		875	&& c->conf != THISNODE
		876	&& c->ictx && c->octx)
		877	{
		878	prio = c->conf->routerprio;
		879	router = c;
		880	}
		881	}
		882	}
		883
		884	return router;
		885	}
		886
		887	void
		888	vpn::connection_established (connection *c)
		889	{
706	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	890	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
707	{	891	{
708	connection c = i;	892	connection o = i;
709		893
710	if (c->conf->routerprio > prio	894	if (o->si.valid ()
711	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	895	&& c->si != o->si
712	&& c->ictx && c->octx	896	&& c == find_router_for (o)
713	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	897	&& !can_direct (THISNODE, o->conf))
714	{
715	prio = c->conf->routerprio;
716	router = c;
717	}	898	{
		899	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		900	o->conf->nodename, c->conf->nodename);
		901	o->rekey ();
		902	}
718	}	903	}
719
720	return router;
721	}	904	}
722		905
		906	void
723	void vpn::send_connect_request (int id)	907	vpn::send_connect_request (connection *c)
724	{	908	{
725	connection *c = find_router ();	909	connection *r = find_router_for (c);
726		910
727	if (c)	911	if (r)
		912	{
		913	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		914	c->conf->nodename, r->conf->nodename);
728	c->send_connect_request (id);	915	r->send_connect_request (c->conf->id);
		916	}
729	else	917	else
730	// no router found, aggressively connect to all routers	918	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	919	c->conf->nodename);
732	if ((i)->conf->routerprio && (i)->conf != THISNODE)
733	(*i)->establish_connection ();
734	}	920	}
735		921
736	void	922	void
737	connection::dump_status ()	923	connection::dump_status ()
738	{	924	{
739	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	925	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
740	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	926	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
741	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	927	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
742	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	928	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
743	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	929	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
744	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
745	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
746	}	930	}
747		931
748	void	932	void
749	vpn::dump_status ()	933	vpn::dump_status ()
750	{	934	{
751	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	935	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
752		936
753	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	937	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
754	(*c)->dump_status ();	938	(*c)->dump_status ();
755		939
756	slog (L_NOTICE, _("END status dump"));	940	slog (L_NOTICE, _("END status dump"));
757	}	941	}
758		942
759	vpn::vpn (void)	943	vpn::vpn (void)
		944	{
760	: event (this, &vpn::event_cb)	945	event .set<vpn, &vpn::event_cb > (this);
761	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	946	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
762	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	947	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
763	#if ENABLE_TCP	948	#if ENABLE_TCP
764	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	949	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
765	#endif	950	#endif
766	#if ENABLE_ICMP	951	#if ENABLE_ICMP
767	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	952	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
768	#endif	953	#endif
769	#if ENABLE_DNS	954	#if ENABLE_DNS
770	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)	955	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
771	#endif	956	#endif
772	, tap_ev_watcher (this, &vpn::tap_ev)	957	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
773	{
774	}	958	}
775		959
776	vpn::~vpn ()	960	vpn::~vpn ()
777	{	961	{
778	}	962	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC vs. Revision 1.67 by root, Fri Oct 11 04:07:24 2013 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC vs.
Revision 1.67 by root, Fri Oct 11 04:07:24 2013 UTC