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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
3	Copyright (C) 2003 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <list>	34	#include <list>
23		35
		36	#include <cstdio>
		37	#include <cstring>
24	#include <cstdlib>	38	#include <cstdlib>
25	#include <cstring>
26	#include <cstdio>
27		39
28	#include <sys/types.h>	40	#include <sys/types.h>
29	#include <sys/socket.h>	41	#include <sys/socket.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <errno.h>	43	#include <errno.h>
40		52
41	#include "connection.h"	53	#include "connection.h"
42	#include "util.h"	54	#include "util.h"
43	#include "vpn.h"	55	#include "vpn.h"
44		56
		57	vpn network; // THE vpn (bad design...)
		58
45	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
46		60
47	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 ()
48	{	75	{
49	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
50	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
51	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
52	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55		82
56	char *env;	83	char *env;
57	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
60	putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id);
62	putenv (env);
63	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69	THISNODE->id & 0xff);
70	putenv (env);
71		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,
72	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	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
73	}	144	}
74		145
75	int	146	int
76	vpn::setup ()	147	vpn::setup ()
77	{	148	{
		149	int success = 0;
		150
		151	ipv4_tos = -1;
78	ipv4_fd = -1;	152	ipv4_fd = -1;
79		153
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	155	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
83		157
84	if (ipv4_fd < 0)	158	if (ipv4_fd < 0)
85	return -1;	159	return -1;
86
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88		160
89	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	161	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	162	// this I really consider a linux bug. I am neither connected
91	// nor do I fragment myself. Linux still sets DF and doesn't	163	// nor do I fragment myself. Linux still sets DF and doesn't
92	// fragment for me sometimes.	164	// fragment for me sometimes.
…		…
98		170
99	sockinfo si (THISNODE, PROT_IPv4);	171	sockinfo si (THISNODE, PROT_IPv4);
100		172
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	174	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	175	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
104	exit (1);	176	return -1;
105	}	177	}
106		178
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
108	}	181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
109		184
		185	udpv4_tos = -1;
110	udpv4_fd = -1;	186	udpv4_fd = -1;
111		187
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	189	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		191
116	if (udpv4_fd < 0)	192	if (udpv4_fd < 0)
117	return -1;	193	return -1;
118
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
120		194
121	// standard daemon practise...	195	// standard daemon practise...
122	{	196	{
123	int oval = 1;	197	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
136		210
137	sockinfo si (THISNODE, PROT_UDPv4);	211	sockinfo si (THISNODE, PROT_UDPv4);
138		212
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	214	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	215	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
142	exit (1);	216	return -1;
143	}	217	}
144		218
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
146	}	221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
147		224
		225	icmpv4_tos = -1;
148	icmpv4_fd = -1;	226	icmpv4_fd = -1;
149		227
150	#if ENABLE_ICMP	228	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	229	if (THISNODE->protocols & PROT_ICMPv4)
152	{	230	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		232
155	if (icmpv4_fd < 0)	233	if (icmpv4_fd < 0)
156	return -1;	234	return -1;
157
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
159		235
160	#ifdef ICMP_FILTER	236	#ifdef ICMP_FILTER
161	{	237	{
162	icmp_filter oval;	238	icmp_filter oval;
163	oval.data = 0xffffffff;	239	oval.data = 0xffffffff;
…		…
172	// this I really consider a linux bug. I am neither connected	248	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	249	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	250	// fragment for me sometimes.
175	{	251	{
176	int oval = IP_PMTUDISC_DONT;	252	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	254	}
179	#endif	255	#endif
180		256
181	sockinfo si (THISNODE, PROT_ICMPv4);	257	sockinfo si (THISNODE, PROT_ICMPv4);
182		258
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	260	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	261	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
186	exit (1);	262	return -1;
187	}	263	}
188		264
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
190	}	267	}
191	#endif	268	#endif
192		269
193	tcpv4_fd = -1;	270	tcpv4_fd = -1;
194		271
195	#if ENABLE_TCP	272	#if ENABLE_TCP
196	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
197	{	274	{
198	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
199		276
200	if (tcpv4_fd < 0)	277	if (tcpv4_fd < 0)
201	return -1;	278	return -1;
202		279
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
204
205	// standard daemon practise...	280	// standard daemon practise...
206	{	281	{
207	int oval = 1;	282	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	283	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
209	}	284	}
210		285
211	sockinfo si (THISNODE, PROT_TCPv4);	286	sockinfo si (THISNODE, PROT_TCPv4);
212		287
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	289	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	290	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
216	exit (1);	291	return -1;
217	}	292	}
218		293
219	if (listen (tcpv4_fd, 5))	294	if (listen (tcpv4_fd, 5))
220	{	295	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	296	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
222	exit (1);	297	return -1;
		298	}
		299
		300	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		301	++success;
		302	}
		303	else
		304	THISNODE->protocols &= ~PROT_TCPv4;
		305	#endif
		306
		307	dnsv4_tos = -1;
		308	dnsv4_fd = -1;
		309
		310	#if ENABLE_DNS
		311	if (THISNODE->protocols & PROT_DNSv4)
		312	{
		313	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		314
		315	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		316
		317	if (dnsv4_fd < 0)
		318	return -1;
		319
		320	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		321	// this I really consider a linux bug. I am neither connected
		322	// nor do I fragment myself. Linux still sets DF and doesn't
		323	// fragment for me sometimes.
		324	{
		325	int oval = IP_PMTUDISC_DONT;
		326	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
223	}	327	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#endif	328	# endif
		329
		330	// standard daemon practise...
		331	{
		332	int oval = 1;
		333	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		334	}
		335
		336	sockinfo si (THISNODE->dns_hostname,
		337	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		338	PROT_DNSv4);
		339
		340	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		341	{
		342	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		343	return -1;
		344	}
		345
		346	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		347	++success;
		348	}
		349	#endif
		350
		351	/////////////////////////////////////////////////////////////////////////////
		352
		353	if (!success)
		354	{
		355	slog (L_ERR, _("no protocols enabled."));
		356	return -1;
		357	}
		358
		359	reconnect_all ();
		360
		361	/////////////////////////////////////////////////////////////////////////////
228		362
229	tap = new tap_device ();	363	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
231	{	365	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
233	exit (1);	367	return -1;
234	}	368	}
235		369
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		371
		372	run_script_cb cb;
		373	cb.set<vpn, &vpn::script_if_init> (this);
		374
		375	if (tap->if_up () &&
		376	!run_script (cb, true))
		377	{
		378	slog (L_ERR, _("interface initialization command '%s' failed."),
		379	tap->if_up ());
		380	return -1;
		381	}
		382
		383	cb.set<vpn, &vpn::script_if_up> (this);
		384	if (!run_script (cb, true))
		385	{
		386	slog (L_ERR, _("if-up command execution failed."));
		387	return -1;
		388	}
		389
238	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		391
242	return 0;	392	return 0;
243	}
244
245	// send a vpn packet out to other hosts
246	bool
247	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
248	{
249	switch (si.prot)
250	{
251	case PROT_IPv4:
252	return send_ipv4_packet (pkt, si, tos);
253
254	case PROT_UDPv4:
255	return send_udpv4_packet (pkt, si, tos);
256
257	#if ENABLE_TCP
258	case PROT_TCPv4:
259	return send_tcpv4_packet (pkt, si, tos);
260	#endif
261
262	#if ENABLE_ICMP
263	case PROT_ICMPv4:
264	return send_icmpv4_packet (pkt, si, tos);
265	#endif
266
267	default:
268	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
269	return false;
270	}
271	}	393	}
272		394
273	bool	395	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	396	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	397	{
276	#if defined(SOL_IP) && defined(IP_TOS)	398	set_tos (ipv4_fd, ipv4_tos, tos);
277	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
278	#endif
279	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
280		400
281	return true;	401	return true;
282	}	402	}
283		403
…		…
306		426
307	#if ENABLE_ICMP	427	#if ENABLE_ICMP
308	bool	428	bool
309	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	429	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
310	{	430	{
311	#if defined(SOL_IP) && defined(IP_TOS)
312	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
313	#endif
314
315	pkt->unshift_hdr (4);	431	pkt->unshift_hdr (4);
316		432
317	icmp_header hdr = (icmp_header )&((*pkt)[0]);	433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
318	hdr->type = ::conf.icmp_type;	434	hdr->type = ::conf.icmp_type;
319	hdr->code = 255;	435	hdr->code = 255;
320	hdr->checksum = 0;	436	hdr->checksum = 0;
321	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
322		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
323	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	440	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
324		441
325	return true;	442	return true;
326	}	443	}
327	#endif	444	#endif
328		445
329	bool	446	bool
330	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	447	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
331	{	448	{
332	#if defined(SOL_IP) && defined(IP_TOS)	449	set_tos (udpv4_fd, udpv4_tos, tos);
333	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334	#endif
335	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
336		451
337	return true;	452	return true;
338	}	453	}
339		454
…		…
350	{	465	{
351	// broadcast, this is ugly, but due to the security policy	466	// broadcast, this is ugly, but due to the security policy
352	// we have to connect to all hosts...	467	// we have to connect to all hosts...
353	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	468	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
354	if ((*c)->conf != THISNODE)	469	if ((*c)->conf != THISNODE)
355	(*c)->inject_data_packet (pkt, true);	470	(*c)->inject_data_packet (pkt);
356	}	471	}
357	}	472	}
358		473
359	void	474	void
360	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
361	{	476	{
362	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
363	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
364		479
365	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	480	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
366	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
367		482
368	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
369	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
370	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
371	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	486	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
372	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
373	else if (dst > conns.size ())	488	else if (dst > conns.size ())
374	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	489	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
375	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
376	else	491	else
377	{	492	{
378	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
379		494
380	if (dst == 0)	495	if (dst == 0)
381	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
382	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
383	else if (dst != THISNODE->id)	498	else if (dst != THISNODE->id)
384	{	499	{
385	if (THISNODE->routerprio)	500	if (THISNODE->routerprio)
386	// the tos setting gets lost here. who cares.	501	// the tos setting gets lost here. who cares.
387	conns[dst - 1]->inject_vpn_packet (pkt);	502	conns[dst - 1]->inject_vpn_packet (pkt);
388	else	503	else
389	slog (L_WARN,	504	slog (L_WARN,
390	_("%s(%s): forwarding request (=> %s), but we are no router"),	505	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
391	c->conf->nodename, (const char *)rsi,	506	c->conf->nodename, (const char *)rsi,
392	conns[dst - 1]->conf->nodename);	507	conns[dst - 1]->conf->nodename);
393	}	508	}
394	else	509	else
395	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
396	}	511	}
397	}	512	}
398		513
399	void	514	bool
		515	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		516	{
		517	switch (si.prot)
		518	{
		519	case PROT_IPv4:
		520	return send_ipv4_packet (pkt, si, tos);
		521
		522	case PROT_UDPv4:
		523	return send_udpv4_packet (pkt, si, tos);
		524
		525	#if ENABLE_TCP
		526	case PROT_TCPv4:
		527	return send_tcpv4_packet (pkt, si, tos);
		528	#endif
		529	#if ENABLE_ICMP
		530	case PROT_ICMPv4:
		531	return send_icmpv4_packet (pkt, si, tos);
		532	#endif
		533	#if ENABLE_DNS
		534	case PROT_DNSv4:
		535	return send_dnsv4_packet (pkt, si, tos);
		536	#endif
		537	default:
		538	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		539	}
		540
		541	return false;
		542	}
		543
		544	inline void
400	vpn::ipv4_ev (io_watcher &w, short revents)	545	vpn::ipv4_ev (ev::io &w, int revents)
401	{	546	{
402	if (revents & (POLLIN \| POLLERR))	547	if (revents & EV_READ)
403	{	548	{
404	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
405	struct sockaddr_in sa;	550	struct sockaddr_in sa;
406	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
407	int len;	552	int len;
…		…
412		557
413	if (len > 0)	558	if (len > 0)
414	{	559	{
415	pkt->len = len;	560	pkt->len = len;
416		561
417	// raw sockets deliver the ipv4, but don't expect it on sends	562	// raw sockets deliver the ipv4 header, but don't expect it on sends
418	// this is slow, but...
419	pkt->skip_hdr (IP_OVERHEAD);	563	pkt->skip_hdr (IP_OVERHEAD);
420		564
421	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
422	}	566	}
423	else	567	else
424	{	568	{
425	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
426	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
427	}	571	}
428		572
429	delete pkt;	573	delete pkt;
430	}	574	}
431	else if (revents & POLLHUP)
432	{
433	// this cannot ;) happen on udp sockets
434	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
435	exit (1);
436	}
437	else	575	else
438	{	576	{
439	slog (L_ERR,	577	slog (L_ERR,
440	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
441	revents);	579	revents);
442	exit (1);	580	exit (EXIT_FAILURE);
443	}	581	}
444	}	582	}
445		583
446	#if ENABLE_ICMP	584	#if ENABLE_ICMP
447	void	585	inline void
448	vpn::icmpv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
449	{	587	{
450	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
451	{	589	{
452	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
453	struct sockaddr_in sa;	591	struct sockaddr_in sa;
454	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
455	int len;	593	int len;
…		…
475	}	613	}
476	}	614	}
477	else	615	else
478	{	616	{
479	// probably ECONNRESET or somesuch	617	// probably ECONNRESET or somesuch
480	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	618	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
481	}	619	}
482		620
483	delete pkt;	621	delete pkt;
484	}	622	}
485	else if (revents & POLLHUP)
486	{
487	// this cannot ;) happen on udp sockets
488	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
489	exit (1);
490	}
491	else	623	else
492	{	624	{
493	slog (L_ERR,	625	slog (L_ERR,
494	_("FATAL: unknown revents %08x in socket, terminating\n"),	626	_("FATAL: unknown revents %08x in socket, exiting.\n"),
495	revents);	627	revents);
496	exit (1);	628	exit (EXIT_FAILURE);
497	}	629	}
498	}	630	}
499	#endif	631	#endif
500		632
501	void	633	inline void
502	vpn::udpv4_ev (io_watcher &w, short revents)	634	vpn::udpv4_ev (ev::io &w, int revents)
503	{	635	{
504	if (revents & (POLLIN \| POLLERR))	636	if (revents & EV_READ)
505	{	637	{
506	vpn_packet *pkt = new vpn_packet;	638	vpn_packet *pkt = new vpn_packet;
507	struct sockaddr_in sa;	639	struct sockaddr_in sa;
508	socklen_t sa_len = sizeof (sa);	640	socklen_t sa_len = sizeof (sa);
509	int len;	641	int len;
…		…
519	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
520	}	652	}
521	else	653	else
522	{	654	{
523	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
524	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	656	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
525	}	657	}
526		658
527	delete pkt;	659	delete pkt;
528	}	660	}
529	else if (revents & POLLHUP)
530	{
531	// this cannot ;) happen on udp sockets
532	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
533	exit (1);
534	}
535	else	661	else
536	{	662	{
537	slog (L_ERR,	663	slog (L_ERR,
538	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
539	revents);	665	revents);
540	exit (1);	666	exit (EXIT_FAILURE);
541	}	667	}
542	}	668	}
543		669
544	void	670	inline void
545	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
546	{	672	{
547	if (revents & POLLIN)	673	if (revents & EV_READ)
548	{	674	{
549	/* process data */	675	/* process data */
550	tap_packet *pkt;	676	tap_packet *pkt;
551		677
552	pkt = tap->recv ();	678	pkt = tap->recv ();
…		…
559	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
560	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
561		687
562	if (src != THISNODE->id)	688	if (src != THISNODE->id)
563	{	689	{
564	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
565	exit (1);	691	exit (EXIT_FAILURE);
566	}	692	}
567		693
568	if (dst == THISNODE->id)	694	if (dst == THISNODE->id)
569	{	695	{
570	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	696	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
571	exit (1);	697	exit (EXIT_FAILURE);
572	}	698	}
573		699
574	if (dst > conns.size ())	700	if (dst > conns.size ())
575	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	701	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
576	else	702	else
577	inject_data_packet (pkt, dst);	703	inject_data_packet (pkt, dst);
578	}	704	}
579		705
580	delete pkt;	706	delete pkt;
581	}	707	}
582	else if (revents & (POLLHUP \| POLLERR))
583	{
584	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
585	exit (1);
586	}
587	else	708	else
588	abort ();	709	abort ();
589	}	710	}
590		711
591	void	712	inline void
592	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
593	{	714	{
594	if (events)	715	if (events)
595	{	716	{
596	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
597	{	718	{
598	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
599		720
600	shutdown_all ();	721	shutdown_all ();
601
602	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
603
604	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
605		724	exit (EXIT_SUCCESS);
606	exit (0);
607	}	725	}
608		726
609	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
610	{	728	{
611	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
612		730
613	reconnect_all ();	731	reconnect_all ();
614	}	732	}
615		733
616	events = 0;	734	events = 0;
617	}	735	}
618
619	w.at = TSTAMP_CANCEL;
620	}	736	}
621		737
622	void	738	void
623	vpn::shutdown_all ()	739	vpn::shutdown_all ()
624	{	740	{
…		…
634		750
635	conns.clear ();	751	conns.clear ();
636		752
637	connection_init ();	753	connection_init ();
638		754
639	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
640	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
641	{
642	connection *conn = new connection (this);
643		757
644	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
645	conns.push_back (conn);
646
647	conn->establish_connection ();	759	(*c)->establish_connection ();
648	}
649	}	760	}
650		761
651	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
652	{	763	{
653	u32 prio = 1;	764	return src != dst
		765	&& src->may_direct (dst)
		766	&& dst->may_direct (src)
		767	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		768	\|\| (src->protocols & dst->connectable_protocols ()));
		769	}
		770
		771	// only works for indirect and routed connections: find a router
		772	// from THISNODE to dst
		773	connection vpn::find_router_for (const connection dst)
		774	{
654	connection *router = 0;	775	connection *router = 0;
655		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 vpn::connection_established (connection *c)
		823	{
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	{	825	{
658	connection c = i;	826	connection o = i;
659		827
660	if (c->conf->routerprio > prio	828	if (!o->is_direct
661	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	829	&& o->si.valid ()
662	&& c->ictx && c->octx	830	&& c->si != o->si
663	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	831	&& c == find_router_for (o))
664	{
665	prio = c->conf->routerprio;
666	router = c;
667	}	832	{
		833	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		834	o->conf->nodename, c->conf->nodename);
		835	o->rekey ();
		836	}
668	}	837	}
669
670	return router;
671	}	838	}
672		839
673	void vpn::send_connect_request (int id)	840	void vpn::send_connect_request (connection *c)
674	{	841	{
675	connection *c = find_router ();	842	connection *r = find_router_for (c);
676		843
677	if (c)	844	if (r)
		845	{
		846	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		847	c->conf->nodename, r->conf->nodename);
678	c->send_connect_request (id);	848	r->send_connect_request (c->conf->id);
		849	}
679	else	850	else
680	// no router found, aggressively connect to all routers	851	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
681	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	c->conf->nodename);
682	if ((i)->conf->routerprio && (i)->conf != THISNODE)
683	(*i)->establish_connection ();
684	}	853	}
685		854
686	void	855	void
687	connection::dump_status ()	856	connection::dump_status ()
688	{	857	{
689	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
690	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
691	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
692	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	861	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
693	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
694	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
695	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
696	}	863	}
697		864
698	void	865	void
699	vpn::dump_status ()	866	vpn::dump_status ()
700	{	867	{
701	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
702		869
703	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
704	(*c)->dump_status ();	871	(*c)->dump_status ();
705		872
706	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
707	}	874	}
708		875
709	vpn::vpn (void)	876	vpn::vpn (void)
		877	{
710	: event (this, &vpn::event_cb)	878	event .set<vpn, &vpn::event_cb > (this);
711	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
712	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
713	#if ENABLE_TCP	881	#if ENABLE_TCP
714	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
715	#endif	883	#endif
716	#if ENABLE_ICMP	884	#if ENABLE_ICMP
717	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
718	#endif	886	#endif
719	, tap_ev_watcher (this, &vpn::tap_ev)	887	#if ENABLE_DNS
720	{	888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
721	}	891	}
722		892
723	vpn::~vpn ()	893	vpn::~vpn ()
724	{	894	{
725	}	895	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 UTC vs. Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC