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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.54 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>
44		56
45	vpn network; // THE vpn (bad design...)	57	vpn network; // THE vpn (bad design...)
46		58
47	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
48		60
49	const char *vpn::script_if_up ()	61	static void inline
		62	set_tos (int fd, int &tos_prev, int tos)
		63	{
		64	#if defined(SOL_IP) && defined(IP_TOS)
		65	if (tos_prev == tos)
		66	return;
		67
		68	tos_prev = tos;
		69	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		70	#endif
		71	}
		72
		73	void
		74	vpn::script_init_env ()
50	{	75	{
51	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
52	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
53	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57		82
58	char *env;	83	char *env;
59	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60	putenv (env);
61	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
62	putenv (env);
63	asprintf (&env, "NODEID=%d", THISNODE->id);
64	putenv (env);
65	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
66	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
68	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
71	THISNODE->id & 0xff);
72	putenv (env);
73		91
		92	conns [THISNODE->id - 1]->script_init_env ("");
		93
		94	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		95	{
		96	char ext[16];
		97	snprintf (ext, 16, "_%d", (*c)->conf->id);
		98	(*c)->script_init_env (ext);
		99	}
		100	}
		101
		102	inline const char *
		103	vpn::script_if_init ()
		104	{
		105	script_init_env ();
		106
		107	return tap->if_up ();
		108	}
		109
		110	inline const char *
		111	vpn::script_if_up ()
		112	{
		113	script_init_env ();
		114
		115	char *filename;
		116	asprintf (&filename,
		117	"%s/%s",
		118	confbase,
74	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	119	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		120
		121	return filename;
		122	}
		123
		124	int
		125	vpn::setup_socket (u8 prot, int family, int type, int proto)
		126	{
		127	int fd = socket (family, type, proto);
		128
		129	if (fd < 0)
		130	{
		131	slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
		132	return fd;
		133	}
		134
		135	fcntl (fd, F_SETFL, O_NONBLOCK);
		136	fcntl (fd, F_SETFD, FD_CLOEXEC);
		137
		138	#ifdef SO_MARK
		139	if (::conf.nfmark)
		140	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
75	}	144	}
76		145
77	int	146	int
78	vpn::setup ()	147	vpn::setup ()
79	{	148	{
		149	int success = 0;
		150
		151	ipv4_tos = -1;
80	ipv4_fd = -1;	152	ipv4_fd = -1;
81		153
82	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
83	{	155	{
84	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
85		157
86	if (ipv4_fd < 0)	158	if (ipv4_fd < 0)
87	return -1;	159	return -1;
88
89	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
90		160
91	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	161	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92	// this I really consider a linux bug. I am neither connected	162	// this I really consider a linux bug. I am neither connected
93	// 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
94	// fragment for me sometimes.	164	// fragment for me sometimes.
…		…
100		170
101	sockinfo si (THISNODE, PROT_IPv4);	171	sockinfo si (THISNODE, PROT_IPv4);
102		172
103	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
104	{	174	{
105	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));
106	exit (1);	176	return -1;
107	}	177	}
108		178
109	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
110	}	181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
111		184
		185	udpv4_tos = -1;
112	udpv4_fd = -1;	186	udpv4_fd = -1;
113		187
114	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
115	{	189	{
116	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
117		191
118	if (udpv4_fd < 0)	192	if (udpv4_fd < 0)
119	return -1;	193	return -1;
120
121	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
122		194
123	// standard daemon practise...	195	// standard daemon practise...
124	{	196	{
125	int oval = 1;	197	int oval = 1;
126	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
138		210
139	sockinfo si (THISNODE, PROT_UDPv4);	211	sockinfo si (THISNODE, PROT_UDPv4);
140		212
141	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
142	{	214	{
143	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));
144	exit (1);	216	return -1;
145	}	217	}
146		218
147	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
148	}	221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
149		224
		225	icmpv4_tos = -1;
150	icmpv4_fd = -1;	226	icmpv4_fd = -1;
151		227
152	#if ENABLE_ICMP	228	#if ENABLE_ICMP
153	if (THISNODE->protocols & PROT_ICMPv4)	229	if (THISNODE->protocols & PROT_ICMPv4)
154	{	230	{
155	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
156		232
157	if (icmpv4_fd < 0)	233	if (icmpv4_fd < 0)
158	return -1;	234	return -1;
159
160	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
161		235
162	#ifdef ICMP_FILTER	236	#ifdef ICMP_FILTER
163	{	237	{
164	icmp_filter oval;	238	icmp_filter oval;
165	oval.data = 0xffffffff;	239	oval.data = 0xffffffff;
…		…
174	// this I really consider a linux bug. I am neither connected	248	// this I really consider a linux bug. I am neither connected
175	// 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
176	// fragment for me sometimes.	250	// fragment for me sometimes.
177	{	251	{
178	int oval = IP_PMTUDISC_DONT;	252	int oval = IP_PMTUDISC_DONT;
179	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
180	}	254	}
181	#endif	255	#endif
182		256
183	sockinfo si (THISNODE, PROT_ICMPv4);	257	sockinfo si (THISNODE, PROT_ICMPv4);
184		258
185	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
186	{	260	{
187	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));
188	exit (1);	262	return -1;
189	}	263	}
190		264
191	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
192	}	267	}
193	#endif	268	#endif
194		269
195	tcpv4_fd = -1;	270	tcpv4_fd = -1;
196		271
197	#if ENABLE_TCP	272	#if ENABLE_TCP
198	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
199	{	274	{
200	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
201		276
202	if (tcpv4_fd < 0)	277	if (tcpv4_fd < 0)
203	return -1;	278	return -1;
204		279
205	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
206
207	// standard daemon practise...	280	// standard daemon practise...
208	{	281	{
209	int oval = 1;	282	int oval = 1;
210	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	283	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
211	}	284	}
212		285
213	sockinfo si (THISNODE, PROT_TCPv4);	286	sockinfo si (THISNODE, PROT_TCPv4);
214		287
215	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
216	{	289	{
217	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));
218	exit (1);	291	return -1;
219	}	292	}
220		293
221	if (listen (tcpv4_fd, 5))	294	if (listen (tcpv4_fd, 5))
222	{	295	{
223	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));
224	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);
225	}	327	}
226
227	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
228	}
229	#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	/////////////////////////////////////////////////////////////////////////////
230		362
231	tap = new tap_device ();	363	tap = new tap_device ();
232	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
233	{	365	{
234	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
235	exit (1);	367	return -1;
236	}	368	}
237		369
238	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
239		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
240	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
241
242	reconnect_all ();
243		391
244	return 0;	392	return 0;
245	}
246
247	// send a vpn packet out to other hosts
248	bool
249	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
250	{
251	switch (si.prot)
252	{
253	case PROT_IPv4:
254	return send_ipv4_packet (pkt, si, tos);
255
256	case PROT_UDPv4:
257	return send_udpv4_packet (pkt, si, tos);
258
259	#if ENABLE_TCP
260	case PROT_TCPv4:
261	return send_tcpv4_packet (pkt, si, tos);
262	#endif
263
264	#if ENABLE_ICMP
265	case PROT_ICMPv4:
266	return send_icmpv4_packet (pkt, si, tos);
267	#endif
268
269	default:
270	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
271	return false;
272	}
273	}	393	}
274		394
275	bool	395	bool
276	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)
277	{	397	{
278	#if defined(SOL_IP) && defined(IP_TOS)	398	set_tos (ipv4_fd, ipv4_tos, tos);
279	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
280	#endif
281	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
282		400
283	return true;	401	return true;
284	}	402	}
285		403
…		…
308		426
309	#if ENABLE_ICMP	427	#if ENABLE_ICMP
310	bool	428	bool
311	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)
312	{	430	{
313	#if defined(SOL_IP) && defined(IP_TOS)
314	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
315	#endif
316
317	pkt->unshift_hdr (4);	431	pkt->unshift_hdr (4);
318		432
319	icmp_header hdr = (icmp_header )&((*pkt)[0]);	433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
320	hdr->type = ::conf.icmp_type;	434	hdr->type = ::conf.icmp_type;
321	hdr->code = 255;	435	hdr->code = 255;
322	hdr->checksum = 0;	436	hdr->checksum = 0;
323	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
324		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
325	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 ());
326		441
327	return true;	442	return true;
328	}	443	}
329	#endif	444	#endif
330		445
331	bool	446	bool
332	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)
333	{	448	{
334	#if defined(SOL_IP) && defined(IP_TOS)	449	set_tos (udpv4_fd, udpv4_tos, tos);
335	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
336	#endif
337	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
338		451
339	return true;	452	return true;
340	}	453	}
341		454
…		…
352	{	465	{
353	// broadcast, this is ugly, but due to the security policy	466	// broadcast, this is ugly, but due to the security policy
354	// we have to connect to all hosts...	467	// we have to connect to all hosts...
355	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	468	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
356	if ((*c)->conf != THISNODE)	469	if ((*c)->conf != THISNODE)
357	(*c)->inject_data_packet (pkt, true);	470	(*c)->inject_data_packet (pkt);
358	}	471	}
359	}	472	}
360		473
361	void	474	void
362	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
363	{	476	{
364	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
365	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
366		479
367	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."),
368	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
369		482
370	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
371	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
372	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
373	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)."),
374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
375	else if (dst > conns.size ())	488	else if (dst > conns.size ())
376	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)."),
377	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
378	else	491	else
379	{	492	{
380	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
381		494
382	if (dst == 0)	495	if (dst == 0)
383	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
384	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
385	else if (dst != THISNODE->id)	498	else if (dst != THISNODE->id)
386	{	499	{
387	if (THISNODE->routerprio)	500	if (THISNODE->routerprio)
388	// the tos setting gets lost here. who cares.	501	// the tos setting gets lost here. who cares.
389	conns[dst - 1]->inject_vpn_packet (pkt);	502	conns[dst - 1]->inject_vpn_packet (pkt);
390	else	503	else
391	slog (L_WARN,	504	slog (L_WARN,
392	_("%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?)."),
393	c->conf->nodename, (const char *)rsi,	506	c->conf->nodename, (const char *)rsi,
394	conns[dst - 1]->conf->nodename);	507	conns[dst - 1]->conf->nodename);
395	}	508	}
396	else	509	else
397	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
398	}	511	}
399	}	512	}
400		513
401	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
402	vpn::ipv4_ev (io_watcher &w, short revents)	545	vpn::ipv4_ev (ev::io &w, int revents)
403	{	546	{
404	if (revents & (POLLIN \| POLLERR))	547	if (revents & EV_READ)
405	{	548	{
406	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
407	struct sockaddr_in sa;	550	struct sockaddr_in sa;
408	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
409	int len;	552	int len;
…		…
414		557
415	if (len > 0)	558	if (len > 0)
416	{	559	{
417	pkt->len = len;	560	pkt->len = len;
418		561
419	// 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
420	// this is slow, but...
421	pkt->skip_hdr (IP_OVERHEAD);	563	pkt->skip_hdr (IP_OVERHEAD);
422		564
423	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
424	}	566	}
425	else	567	else
426	{	568	{
427	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
428	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
429	}	571	}
430		572
431	delete pkt;	573	delete pkt;
432	}	574	}
433	else if (revents & POLLHUP)
434	{
435	// this cannot ;) happen on udp sockets
436	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
437	exit (1);
438	}
439	else	575	else
440	{	576	{
441	slog (L_ERR,	577	slog (L_ERR,
442	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
443	revents);	579	revents);
444	exit (1);	580	exit (EXIT_FAILURE);
445	}	581	}
446	}	582	}
447		583
448	#if ENABLE_ICMP	584	#if ENABLE_ICMP
449	void	585	inline void
450	vpn::icmpv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
451	{	587	{
452	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
453	{	589	{
454	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
455	struct sockaddr_in sa;	591	struct sockaddr_in sa;
456	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
457	int len;	593	int len;
…		…
477	}	613	}
478	}	614	}
479	else	615	else
480	{	616	{
481	// probably ECONNRESET or somesuch	617	// probably ECONNRESET or somesuch
482	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	618	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
483	}	619	}
484		620
485	delete pkt;	621	delete pkt;
486	}	622	}
487	else if (revents & POLLHUP)
488	{
489	// this cannot ;) happen on udp sockets
490	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
491	exit (1);
492	}
493	else	623	else
494	{	624	{
495	slog (L_ERR,	625	slog (L_ERR,
496	_("FATAL: unknown revents %08x in socket, terminating\n"),	626	_("FATAL: unknown revents %08x in socket, exiting.\n"),
497	revents);	627	revents);
498	exit (1);	628	exit (EXIT_FAILURE);
499	}	629	}
500	}	630	}
501	#endif	631	#endif
502		632
503	void	633	inline void
504	vpn::udpv4_ev (io_watcher &w, short revents)	634	vpn::udpv4_ev (ev::io &w, int revents)
505	{	635	{
506	if (revents & (POLLIN \| POLLERR))	636	if (revents & EV_READ)
507	{	637	{
508	vpn_packet *pkt = new vpn_packet;	638	vpn_packet *pkt = new vpn_packet;
509	struct sockaddr_in sa;	639	struct sockaddr_in sa;
510	socklen_t sa_len = sizeof (sa);	640	socklen_t sa_len = sizeof (sa);
511	int len;	641	int len;
…		…
521	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
522	}	652	}
523	else	653	else
524	{	654	{
525	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
526	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));
527	}	657	}
528		658
529	delete pkt;	659	delete pkt;
530	}	660	}
531	else if (revents & POLLHUP)
532	{
533	// this cannot ;) happen on udp sockets
534	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
535	exit (1);
536	}
537	else	661	else
538	{	662	{
539	slog (L_ERR,	663	slog (L_ERR,
540	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
541	revents);	665	revents);
542	exit (1);	666	exit (EXIT_FAILURE);
543	}	667	}
544	}	668	}
545		669
546	void	670	inline void
547	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
548	{	672	{
549	if (revents & POLLIN)	673	if (revents & EV_READ)
550	{	674	{
551	/* process data */	675	/* process data */
552	tap_packet *pkt;	676	tap_packet *pkt;
553		677
554	pkt = tap->recv ();	678	pkt = tap->recv ();
…		…
561	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
562	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
563		687
564	if (src != THISNODE->id)	688	if (src != THISNODE->id)
565	{	689	{
566	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."));
567	exit (1);	691	exit (EXIT_FAILURE);
568	}	692	}
569		693
570	if (dst == THISNODE->id)	694	if (dst == THISNODE->id)
571	{	695	{
572	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."));
573	exit (1);	697	exit (EXIT_FAILURE);
574	}	698	}
575		699
576	if (dst > conns.size ())	700	if (dst > conns.size ())
577	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);
578	else	702	else
579	inject_data_packet (pkt, dst);	703	inject_data_packet (pkt, dst);
580	}	704	}
581		705
582	delete pkt;	706	delete pkt;
583	}	707	}
584	else if (revents & (POLLHUP \| POLLERR))
585	{
586	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
587	exit (1);
588	}
589	else	708	else
590	abort ();	709	abort ();
591	}	710	}
592		711
593	void	712	inline void
594	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
595	{	714	{
596	if (events)	715	if (events)
597	{	716	{
598	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
599	{	718	{
600	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
601		720
602	shutdown_all ();	721	shutdown_all ();
603
604	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
605
606	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
607		724	exit (EXIT_SUCCESS);
608	exit (0);
609	}	725	}
610		726
611	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
612	{	728	{
613	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
614		730
615	reconnect_all ();	731	reconnect_all ();
616	}	732	}
617		733
618	events = 0;	734	events = 0;
619	}	735	}
620
621	w.at = TSTAMP_CANCEL;
622	}	736	}
623		737
624	void	738	void
625	vpn::shutdown_all ()	739	vpn::shutdown_all ()
626	{	740	{
…		…
636		750
637	conns.clear ();	751	conns.clear ();
638		752
639	connection_init ();	753	connection_init ();
640		754
641	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
642	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
643	{
644	connection *conn = new connection (this);
645		757
646	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
647	conns.push_back (conn);
648
649	conn->establish_connection ();	759	(*c)->establish_connection ();
650	}
651	}	760	}
652		761
653	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
654	{	763	{
655	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	{
656	connection *router = 0;	775	connection *router = 0;
657		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	{
658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
659	{	825	{
660	connection c = i;	826	connection o = i;
661		827
662	if (c->conf->routerprio > prio	828	if (!o->is_direct
663	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	829	&& o->si.valid ()
664	&& c->ictx && c->octx	830	&& c->si != o->si
665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	831	&& c == find_router_for (o))
666	{
667	prio = c->conf->routerprio;
668	router = c;
669	}	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	}
670	}	837	}
671
672	return router;
673	}	838	}
674		839
675	void vpn::send_connect_request (int id)	840	void vpn::send_connect_request (connection *c)
676	{	841	{
677	connection *c = find_router ();	842	connection *r = find_router_for (c);
678		843
679	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);
680	c->send_connect_request (id);	848	r->send_connect_request (c->conf->id);
		849	}
681	else	850	else
682	// 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."),
683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	c->conf->nodename);
684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
685	(*i)->establish_connection ();
686	}	853	}
687		854
688	void	855	void
689	connection::dump_status ()	856	connection::dump_status ()
690	{	857	{
691	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
692	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
693	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
694	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"),
695	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(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	}	863	}
699		864
700	void	865	void
701	vpn::dump_status ()	866	vpn::dump_status ()
702	{	867	{
703	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
704		869
705	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
706	(*c)->dump_status ();	871	(*c)->dump_status ();
707		872
708	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
709	}	874	}
710		875
711	vpn::vpn (void)	876	vpn::vpn (void)
		877	{
712	: event (this, &vpn::event_cb)	878	event .set<vpn, &vpn::event_cb > (this);
713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
715	#if ENABLE_TCP	881	#if ENABLE_TCP
716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
717	#endif	883	#endif
718	#if ENABLE_ICMP	884	#if ENABLE_ICMP
719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
720	#endif	886	#endif
721	, tap_ev_watcher (this, &vpn::tap_ev)	887	#if ENABLE_DNS
722	{	888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
723	}	891	}
724		892
725	vpn::~vpn ()	893	vpn::~vpn ()
726	{	894	{
727	}	895	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs. Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC