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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.26 by pcg, Sun Jul 25 18:11:54 2004 UTC vs.
Revision 1.68 by root, Wed Jul 15 23:04:06 2015 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 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>
26	#include <cstdlib>	38	#include <cstdlib>
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>
		43	#include <sys/stat.h>
31	#include <errno.h>	44	#include <errno.h>
32	#include <time.h>	45	#include <time.h>
33	#include <unistd.h>	46	#include <unistd.h>
34	#include <fcntl.h>	47	#include <fcntl.h>
35	#include <sys/socket.h>	48	#include <sys/socket.h>
…		…
40		53
41	#include "connection.h"	54	#include "connection.h"
42	#include "util.h"	55	#include "util.h"
43	#include "vpn.h"	56	#include "vpn.h"
44		57
		58	using namespace std;
		59
45	vpn network; // THE vpn (bad design...)	60	vpn network; // THE vpn (bad design...)
46		61
47	/////////////////////////////////////////////////////////////////////////////	62	/////////////////////////////////////////////////////////////////////////////
48		63
49	const char *vpn::script_if_up ()	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	}
		75
		76	void
		77	vpn::script_init_env ()
50	{	78	{
51	// the tunnel device mtu should be the physical mtu - overhead	79	// the tunnel device mtu should be the physical mtu - overhead
52	// the tricky part is rounding to the cipher key blocksize	80	// the tricky part is rounding to the cipher key blocksize
53	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	81	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	82	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	83	mtu -= mtu % BLOCK_SIZE (CIPHER); // round
56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	84	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57		85
58	char *env;	86	char *env;
59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);	87	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);	88	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);	89	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);	90	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu); putenv (env);	91	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	92	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	93	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	THISNODE->id & 0xff);
69	putenv (env);
70		94
71	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	95	conns [THISNODE->id - 1]->script_init_env ("");
		96
		97	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		98	{
		99	char ext[16];
		100	snprintf (ext, 16, "_%d", (*c)->conf->id);
		101	(*c)->script_init_env (ext);
		102	}
		103	}
		104
		105	inline const char *
		106	vpn::script_if_init ()
		107	{
		108	script_init_env ();
		109
		110	return tap->if_up ();
		111	}
		112
		113	inline const char *
		114	vpn::script_if_up ()
		115	{
		116	script_init_env ();
		117
		118	return conf.config_filename (::conf.script_if_up, "if-up");
		119	}
		120
		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;
72	}	142	}
73		143
74	int	144	int
75	vpn::setup ()	145	vpn::setup ()
76	{	146	{
		147	int success = 0;
		148
		149	ipv4_tos = -1;
77	ipv4_fd = -1;	150	ipv4_fd = -1;
78		151
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	152	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	153	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	154	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
82		155
83	if (ipv4_fd < 0)	156	if (ipv4_fd < 0)
84	return -1;	157	return -1;
85
86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
87		158
88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	159	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89	// this I really consider a linux bug. I am neither connected	160	// this I really consider a linux bug. I am neither connected
90	// 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
91	// fragment for me sometimes.	162	// fragment for me sometimes.
…		…
97		168
98	sockinfo si (THISNODE, PROT_IPv4);	169	sockinfo si (THISNODE, PROT_IPv4);
99		170
100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	171	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101	{	172	{
102	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));
103	exit (EXIT_FAILURE);	174	return -1;
104	}	175	}
105		176
106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);	177	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		178	++success;
107	}	179	}
		180	else
		181	THISNODE->protocols &= ~PROT_IPv4;
108		182
		183	udpv4_tos = -1;
109	udpv4_fd = -1;	184	udpv4_fd = -1;
110		185
111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	186	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112	{	187	{
113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	188	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114		189
115	if (udpv4_fd < 0)	190	if (udpv4_fd < 0)
116	return -1;	191	return -1;
117
118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
119		192
120	// standard daemon practise...	193	// standard daemon practise...
121	{	194	{
122	int oval = 1;	195	int oval = 1;
123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	196	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
135		208
136	sockinfo si (THISNODE, PROT_UDPv4);	209	sockinfo si (THISNODE, PROT_UDPv4);
137		210
138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	211	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139	{	212	{
140	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));
141	exit (EXIT_FAILURE);	214	return -1;
142	}	215	}
143		216
144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);	217	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		218	++success;
145	}	219	}
		220	else
		221	THISNODE->protocols &= ~PROT_UDPv4;
146		222
		223	icmpv4_tos = -1;
147	icmpv4_fd = -1;	224	icmpv4_fd = -1;
148		225
149	#if ENABLE_ICMP	226	#if ENABLE_ICMP
150	if (THISNODE->protocols & PROT_ICMPv4)	227	if (THISNODE->protocols & PROT_ICMPv4)
151	{	228	{
152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	229	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
153		230
154	if (icmpv4_fd < 0)	231	if (icmpv4_fd < 0)
155	return -1;	232	return -1;
156
157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
158		233
159	#ifdef ICMP_FILTER	234	#ifdef ICMP_FILTER
160	{	235	{
161	icmp_filter oval;	236	icmp_filter oval;
162	oval.data = 0xffffffff;	237	oval.data = 0xffffffff;
…		…
171	// this I really consider a linux bug. I am neither connected	246	// this I really consider a linux bug. I am neither connected
172	// 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
173	// fragment for me sometimes.	248	// fragment for me sometimes.
174	{	249	{
175	int oval = IP_PMTUDISC_DONT;	250	int oval = IP_PMTUDISC_DONT;
176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	251	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	252	}
178	#endif	253	#endif
179		254
180	sockinfo si (THISNODE, PROT_ICMPv4);	255	sockinfo si (THISNODE, PROT_ICMPv4);
181		256
182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	257	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183	{	258	{
184	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));
185	exit (EXIT_FAILURE);	260	return -1;
186	}	261	}
187		262
188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);	263	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		264	++success;
189	}	265	}
190	#endif	266	#endif
191		267
192	tcpv4_fd = -1;	268	tcpv4_fd = -1;
193		269
194	#if ENABLE_TCP	270	#if ENABLE_TCP
195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	271	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
196	{	272	{
197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	273	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
198		274
199	if (tcpv4_fd < 0)	275	if (tcpv4_fd < 0)
200	return -1;	276	return -1;
201		277
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
203
204	// standard daemon practise...	278	// standard daemon practise...
205	{	279	{
206	int oval = 1;	280	int oval = 1;
207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	281	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
208	}	282	}
209		283
210	sockinfo si (THISNODE, PROT_TCPv4);	284	sockinfo si (THISNODE, PROT_TCPv4);
211		285
212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	286	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213	{	287	{
214	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));
215	exit (EXIT_FAILURE);	289	return -1;
216	}	290	}
217		291
218	if (listen (tcpv4_fd, 5))	292	if (listen (tcpv4_fd, 5))
219	{	293	{
220	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));
221	exit (EXIT_FAILURE);	295	return -1;
222	}	296	}
223		297
224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);	298	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		299	++success;
225	}	300	}
		301	else
		302	THISNODE->protocols &= ~PROT_TCPv4;
226	#endif	303	#endif
		304
		305	dnsv4_tos = -1;
		306	dnsv4_fd = -1;
227		307
228	#if ENABLE_DNS	308	#if ENABLE_DNS
229	if (THISNODE->protocols & PROT_DNSv4)	309	if (THISNODE->protocols & PROT_DNSv4)
230	{	310	{
		311	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		312
231	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	313	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
232		314
233	if (dnsv4_fd < 0)	315	if (dnsv4_fd < 0)
234	return -1;	316	return -1;
235		317
		318	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		319	// this I really consider a linux bug. I am neither connected
		320	// nor do I fragment myself. Linux still sets DF and doesn't
		321	// fragment for me sometimes.
		322	{
		323	int oval = IP_PMTUDISC_DONT;
		324	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		325	}
		326	# endif
		327
236	// standard daemon practise...	328	// standard daemon practise...
237	{	329	{
238	int oval = 1;	330	int oval = 1;
239	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	331	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
240	}	332	}
241		333
242	sockinfo si (THISNODE, PROT_DNSv4);	334	sockinfo si (THISNODE->dns_hostname,
		335	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		336	PROT_DNSv4);
243		337
244	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))	338	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
245	{	339	{
246	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));
247	exit (EXIT_FAILURE);	341	return -1;
248	}	342	}
249		343
250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);	344	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		345	++success;
		346	}
		347	#endif
		348
		349	/////////////////////////////////////////////////////////////////////////////
		350
		351	if (!success)
251	}	352	{
252	#endif	353	slog (L_ERR, _("no protocols enabled."));
		354	return -1;
		355	}
		356
		357	reconnect_all ();
		358
		359	/////////////////////////////////////////////////////////////////////////////
253		360
254	tap = new tap_device ();	361	tap = new tap_device ();
255	if (!tap) //D this, of course, never catches	362	if (!tap) //D this, of course, never catches
256	{	363	{
257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	364	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
258	exit (EXIT_FAILURE);	365	return -1;
259	}	366	}
260		367
261	run_script (run_script_cb (this, &vpn::script_if_up), true);	368	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
262		369
		370	run_script_cb cb;
		371	cb.set<vpn, &vpn::script_if_init> (this);
		372
		373	if (tap->if_up () &&
		374	!run_script (cb, true))
		375	{
		376	slog (L_ERR, _("interface initialization command '%s' failed."),
		377	tap->if_up ());
		378	return -1;
		379	}
		380
		381	cb.set<vpn, &vpn::script_if_up> (this);
		382	if (!run_script (cb, true))
		383	{
		384	slog (L_ERR, _("if-up command execution failed."));
		385	return -1;
		386	}
		387
263	tap_ev_watcher.start (tap->fd, EVENT_READ);	388	tap_ev_watcher.start (tap->fd, EV_READ);
264
265	reconnect_all ();
266		389
267	return 0;	390	return 0;
268	}	391	}
269		392
270	// send a vpn packet out to other hosts
271	bool	393	bool
272	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	394	vpn::drop_privileges ()
273	{	395	{
274	switch (si.prot)	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 create 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))
275	{	446	{
276	case PROT_IPv4:	447	slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid);
277	return send_ipv4_packet (pkt, si, tos);
278
279	case PROT_UDPv4:
280	return send_udpv4_packet (pkt, si, tos);
281
282	#if ENABLE_TCP
283	case PROT_TCPv4:
284	return send_tcpv4_packet (pkt, si, tos);
285	#endif
286
287	#if ENABLE_ICMP
288	case PROT_ICMPv4:
289	return send_icmpv4_packet (pkt, si, tos);
290	#endif
291
292	#if ENABLE_DNS
293	case PROT_DNSv4:
294	return send_dnsv4_packet (pkt, si, tos);
295	#endif
296
297	default:
298	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
299	return false;	448	return false;
300	}	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;
301	}	459	}
302		460
303	bool	461	bool
304	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)
305	{	463	{
306	#if defined(SOL_IP) && defined(IP_TOS)	464	set_tos (ipv4_fd, ipv4_tos, tos);
307	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
308	#endif
309	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 ());
310		466
311	return true;	467	return true;
312	}	468	}
313		469
…		…
336		492
337	#if ENABLE_ICMP	493	#if ENABLE_ICMP
338	bool	494	bool
339	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)
340	{	496	{
341	#if defined(SOL_IP) && defined(IP_TOS)
342	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
343	#endif
344
345	pkt->unshift_hdr (4);	497	pkt->unshift_hdr (4);
346		498
347	icmp_header hdr = (icmp_header )&((*pkt)[0]);	499	icmp_header hdr = (icmp_header )&((*pkt)[0]);
348	hdr->type = ::conf.icmp_type;	500	hdr->type = ::conf.icmp_type;
349	hdr->code = 255;	501	hdr->code = 255;
350	hdr->checksum = 0;	502	hdr->checksum = 0;
351	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	503	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
352		504
		505	set_tos (icmpv4_fd, icmpv4_tos, tos);
353	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 ());
354		507
355	return true;	508	return true;
356	}	509	}
357	#endif	510	#endif
358		511
359	bool	512	bool
360	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)
361	{	514	{
362	#if defined(SOL_IP) && defined(IP_TOS)	515	set_tos (udpv4_fd, udpv4_tos, tos);
363	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
364	#endif
365	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 ());
366		517
367	return true;	518	return true;
368	}	519	}
369		520
…		…
380	{	531	{
381	// broadcast, this is ugly, but due to the security policy	532	// broadcast, this is ugly, but due to the security policy
382	// we have to connect to all hosts...	533	// we have to connect to all hosts...
383	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	534	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
384	if ((*c)->conf != THISNODE)	535	if ((*c)->conf != THISNODE)
385	(*c)->inject_data_packet (pkt, true);	536	(*c)->inject_data_packet (pkt);
386	}	537	}
387	}	538	}
388		539
389	void	540	void
390	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	541	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
391	{	542	{
392	unsigned int src = pkt->src ();	543	unsigned int src = pkt->src ();
393	unsigned int dst = pkt->dst ();	544	unsigned int dst = pkt->dst ();
394		545
395	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."),
396	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	547	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
397		548
398	if (src == 0 \|\| src > conns.size ()	549	if (src == 0 \|\| src > conns.size ()
399	\|\| dst > conns.size ()	550	\|\| dst > conns.size ()
400	\|\| pkt->typ () >= vpn_packet::PT_MAX)	551	\|\| pkt->typ () >= vpn_packet::PT_MAX)
401	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)."),
402	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
403	else if (dst > conns.size ())
404	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
405	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	553	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
406	else	554	else
407	{	555	{
408	connection *c = conns[src - 1];	556	connection *c = conns[src - 1];
409		557
410	if (dst == 0)	558	if (dst == 0)
411	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	559	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
412	c->conf->nodename, (const char *)rsi);	560	c->conf->nodename, (const char *)rsi);
413	else if (dst != THISNODE->id)	561	else if (dst != THISNODE->id)
414	{	562	{
415	if (THISNODE->routerprio)	563	if (THISNODE->routerprio)
416	// the tos setting gets lost here. who cares.	564	// the tos setting gets lost here. who cares.
417	conns[dst - 1]->inject_vpn_packet (pkt);	565	conns[dst - 1]->inject_vpn_packet (pkt);
418	else	566	else
419	slog (L_WARN,	567	slog (L_WARN,
420	_("%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?)."),
421	c->conf->nodename, (const char *)rsi,	569	c->conf->nodename, (const char *)rsi,
422	conns[dst - 1]->conf->nodename);	570	conns[dst - 1]->conf->nodename);
423	}	571	}
424	else	572	else
425	c->recv_vpn_packet (pkt, rsi);	573	c->recv_vpn_packet (pkt, rsi);
426	}	574	}
427	}	575	}
428		576
429	void	577	bool
		578	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		579	{
		580	switch (si.prot)
		581	{
		582	case PROT_IPv4:
		583	return send_ipv4_packet (pkt, si, tos);
		584
		585	case PROT_UDPv4:
		586	return send_udpv4_packet (pkt, si, tos);
		587
		588	#if ENABLE_TCP
		589	case PROT_TCPv4:
		590	return send_tcpv4_packet (pkt, si, tos);
		591	#endif
		592	#if ENABLE_ICMP
		593	case PROT_ICMPv4:
		594	return send_icmpv4_packet (pkt, si, tos);
		595	#endif
		596	#if ENABLE_DNS
		597	case PROT_DNSv4:
		598	return send_dnsv4_packet (pkt, si, tos);
		599	#endif
		600	default:
		601	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		602	}
		603
		604	return false;
		605	}
		606
		607	inline void
430	vpn::ipv4_ev (io_watcher &w, short revents)	608	vpn::ipv4_ev (ev::io &w, int revents)
431	{	609	{
432	if (revents & EVENT_READ)	610	if (revents & EV_READ)
433	{	611	{
434	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
435	struct sockaddr_in sa;	613	struct sockaddr_in sa;
436	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
437	int len;	615	int len;
…		…
442		620
443	if (len > 0)	621	if (len > 0)
444	{	622	{
445	pkt->len = len;	623	pkt->len = len;
446		624
447	// raw sockets deliver the ipv4, but don't expect it on sends	625	// raw sockets deliver the ipv4 header, but don't expect it on sends
448	// this is slow, but...	626	pkt->skip_hdr (pkt->ipv4_hdr_len ());
449	pkt->skip_hdr (IP_OVERHEAD);
450		627
451	recv_vpn_packet (pkt, si);	628	recv_vpn_packet (pkt, si);
452	}	629	}
453	else	630	else
454	{	631	{
455	// probably ECONNRESET or somesuch	632	// probably ECONNRESET or somesuch
456	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	633	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
457	}	634	}
458		635
459	delete pkt;	636	delete pkt;
460	}	637	}
461	else	638	else
462	{	639	{
463	slog (L_ERR,	640	slog (L_ERR,
464	_("FATAL: unknown revents %08x in socket, terminating\n"),	641	_("FATAL: unknown revents %08x in socket, exiting.\n"),
465	revents);	642	revents);
466	exit (EXIT_FAILURE);	643	exit (EXIT_FAILURE);
467	}	644	}
468	}	645	}
469		646
470	#if ENABLE_ICMP	647	#if ENABLE_ICMP
471	void	648	inline void
472	vpn::icmpv4_ev (io_watcher &w, short revents)	649	vpn::icmpv4_ev (ev::io &w, int revents)
473	{	650	{
474	if (revents & EVENT_READ)	651	if (revents & EV_READ)
475	{	652	{
476	vpn_packet *pkt = new vpn_packet;	653	vpn_packet *pkt = new vpn_packet;
477	struct sockaddr_in sa;	654	struct sockaddr_in sa;
478	socklen_t sa_len = sizeof (sa);	655	socklen_t sa_len = sizeof (sa);
479	int len;	656	int len;
…		…
491	if (hdr->type == ::conf.icmp_type	668	if (hdr->type == ::conf.icmp_type
492	&& hdr->code == 255)	669	&& hdr->code == 255)
493	{	670	{
494	// 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
495	// this is slow, but...	672	// this is slow, but...
496	pkt->skip_hdr (ICMP_OVERHEAD);	673	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
497		674
498	recv_vpn_packet (pkt, si);	675	recv_vpn_packet (pkt, si);
499	}	676	}
500	}	677	}
501	else	678	else
502	{	679	{
503	// probably ECONNRESET or somesuch	680	// probably ECONNRESET or somesuch
504	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	681	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
505	}	682	}
506		683
507	delete pkt;	684	delete pkt;
508	}	685	}
509	else	686	else
510	{	687	{
511	slog (L_ERR,	688	slog (L_ERR,
512	_("FATAL: unknown revents %08x in socket, terminating\n"),	689	_("FATAL: unknown revents %08x in socket, exiting.\n"),
513	revents);	690	revents);
514	exit (EXIT_FAILURE);	691	exit (EXIT_FAILURE);
515	}	692	}
516	}	693	}
517	#endif	694	#endif
518		695
519	void	696	inline void
520	vpn::udpv4_ev (io_watcher &w, short revents)	697	vpn::udpv4_ev (ev::io &w, int revents)
521	{	698	{
522	if (revents & EVENT_READ)	699	if (revents & EV_READ)
523	{	700	{
524	vpn_packet *pkt = new vpn_packet;	701	vpn_packet *pkt = new vpn_packet;
525	struct sockaddr_in sa;	702	struct sockaddr_in sa;
526	socklen_t sa_len = sizeof (sa);	703	socklen_t sa_len = sizeof (sa);
527	int len;	704	int len;
…		…
537	recv_vpn_packet (pkt, si);	714	recv_vpn_packet (pkt, si);
538	}	715	}
539	else	716	else
540	{	717	{
541	// probably ECONNRESET or somesuch	718	// probably ECONNRESET or somesuch
542	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));
543	}	720	}
544		721
545	delete pkt;	722	delete pkt;
546	}	723	}
547	else	724	else
548	{	725	{
549	slog (L_ERR,	726	slog (L_ERR,
550	_("FATAL: unknown revents %08x in socket, terminating\n"),	727	_("FATAL: unknown revents %08x in socket, exiting.\n"),
551	revents);	728	revents);
552	exit (EXIT_FAILURE);	729	exit (EXIT_FAILURE);
553	}	730	}
554	}	731	}
555		732
556	void	733	inline void
557	vpn::tap_ev (io_watcher &w, short revents)	734	vpn::tap_ev (ev::io &w, int revents)
558	{	735	{
559	if (revents & EVENT_READ)	736	if (revents & EV_READ)
560	{	737	{
561	/* process data */	738	/* process data */
562	tap_packet *pkt;	739	tap_packet *pkt;
563		740
564	pkt = tap->recv ();	741	pkt = tap->recv ();
…		…
571	int dst = mac2id (pkt->dst);	748	int dst = mac2id (pkt->dst);
572	int src = mac2id (pkt->src);	749	int src = mac2id (pkt->src);
573		750
574	if (src != THISNODE->id)	751	if (src != THISNODE->id)
575	{	752	{
576	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	753	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
577	exit (EXIT_FAILURE);	754	exit (EXIT_FAILURE);
578	}	755	}
579		756
580	if (dst == THISNODE->id)	757	if (dst == THISNODE->id)
581	{	758	{
…		…
593	}	770	}
594	else	771	else
595	abort ();	772	abort ();
596	}	773	}
597		774
598	void	775	inline void
599	vpn::event_cb (time_watcher &w)	776	vpn::event_cb (ev::timer &w, int)
600	{	777	{
601	if (events)	778	if (events)
602	{	779	{
603	if (events & EVENT_SHUTDOWN)	780	if (events & EVENT_SHUTDOWN)
604	{	781	{
605	slog (L_INFO, _("preparing shutdown..."));	782	slog (L_INFO, _("preparing shutdown..."));
606		783
607	shutdown_all ();	784	shutdown_all ();
608	remove_pid (conf.pidfilename);	785	remove_pid (conf.pidfilename);
609	slog (L_INFO, _("terminating"));	786	slog (L_INFO, _("exiting."));
610	exit (EXIT_SUCCESS);	787	exit (EXIT_SUCCESS);
611	}	788	}
612		789
613	if (events & EVENT_RECONNECT)	790	if (events & EVENT_RECONNECT)
614	{	791	{
615	slog (L_INFO, _("forced reconnect"));	792	slog (L_INFO, _("forced reconnect."));
616		793
617	reconnect_all ();	794	reconnect_all ();
618	}	795	}
619		796
620	events = 0;	797	events = 0;
…		…
636		813
637	conns.clear ();	814	conns.clear ();
638		815
639	connection_init ();	816	connection_init ();
640		817
641	for (configuration::node_vector::iterator i = conf.nodes.begin ();	818	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
642	i != conf.nodes.end (); ++i)	819	conns.push_back (new connection (this, *i));
643	{
644	connection *conn = new connection (this);
645		820
646	conn->conf = *i;	821	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
647	conns.push_back (conn);
648
649	conn->establish_connection ();	822	(*c)->establish_connection ();
650	}
651	}	823	}
652		824
653	connection *vpn::find_router ()	825	bool
		826	vpn::can_direct (conf_node src, conf_node dst) const
654	{	827	{
655	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	{
656	connection *router = 0;	840	connection *router = 0;
657		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	{
658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	890	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
659	{	891	{
660	connection c = i;	892	connection o = i;
661		893
662	if (c->conf->routerprio > prio	894	if (o->si.valid ()
663	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	895	&& c->si != o->si
664	&& c->ictx && c->octx	896	&& c == find_router_for (o)
665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	897	&& !can_direct (THISNODE, o->conf))
666	{
667	prio = c->conf->routerprio;
668	router = c;
669	}	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	}
670	}	903	}
671
672	return router;
673	}	904	}
674		905
		906	void
675	void vpn::send_connect_request (int id)	907	vpn::send_connect_request (connection *c)
676	{	908	{
677	connection *c = find_router ();	909	connection *r = find_router_for (c);
678		910
679	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);
680	c->send_connect_request (id);	915	r->send_connect_request (c->conf->id);
		916	}
681	else	917	else
682	// 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."),
683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	919	c->conf->nodename);
684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
685	(*i)->establish_connection ();
686	}	920	}
687		921
688	void	922	void
689	connection::dump_status ()	923	connection::dump_status ()
690	{	924	{
691	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	925	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
692	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	926	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
693	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	927	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
694	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"),
695	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	929	(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	}	930	}
699		931
700	void	932	void
701	vpn::dump_status ()	933	vpn::dump_status ()
702	{	934	{
703	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	935	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
704		936
705	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	937	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
706	(*c)->dump_status ();	938	(*c)->dump_status ();
707		939
708	slog (L_NOTICE, _("END status dump"));	940	slog (L_NOTICE, _("END status dump"));
709	}	941	}
710		942
711	vpn::vpn (void)	943	vpn::vpn (void)
		944	{
712	: event (this, &vpn::event_cb)	945	event .set<vpn, &vpn::event_cb > (this);
713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	946	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	947	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
715	#if ENABLE_TCP	948	#if ENABLE_TCP
716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	949	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
717	#endif	950	#endif
718	#if ENABLE_ICMP	951	#if ENABLE_ICMP
719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	952	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
720	#endif	953	#endif
721	#if ENABLE_DNS	954	#if ENABLE_DNS
722	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)	955	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
723	#endif	956	#endif
724	, tap_ev_watcher (this, &vpn::tap_ev)	957	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
725	{
726	}	958	}
727		959
728	vpn::~vpn ()	960	vpn::~vpn ()
729	{	961	{
730	}	962	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.26 by pcg, Sun Jul 25 18:11:54 2004 UTC vs. Revision 1.68 by root, Wed Jul 15 23:04:06 2015 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.26 by pcg, Sun Jul 25 18:11:54 2004 UTC vs.
Revision 1.68 by root, Wed Jul 15 23:04:06 2015 UTC