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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.47 by pcg, Thu Aug 7 17:54:27 2008 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	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
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	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
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	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
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	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.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <errno.h>	43	#include <errno.h>
32	#include <time.h>	44	#include <time.h>
33	#include <unistd.h>	45	#include <unistd.h>
34	#include <fcntl.h>	46	#include <fcntl.h>
35	#include <sys/socket.h>	47	#include <sys/socket.h>
36	#include <netinet/in.h>	48
37	#include <arpa/inet.h>	49	#include "netcompat.h"
38	#include <net/if.h>
39	#ifdef HAVE_NETINET_IN_SYSTM_H
40	# include <netinet/in_systm.h>
41	#endif
42	#ifdef HAVE_NETINET_IP_H
43	# include <netinet/ip.h>
44	#endif
45	#ifdef HAVE_NETINET_TCP_H
46	# include <netinet/tcp.h>
47	#endif
48	#if ENABLE_ICMP
49	# include <netinet/ip_icmp.h>
50	#endif
51		50
52	#include "pidfile.h"	51	#include "pidfile.h"
53		52
54	#include "connection.h"	53	#include "connection.h"
55	#include "util.h"	54	#include "util.h"
56	#include "vpn.h"	55	#include "vpn.h"
57		56
58	#if !defined(SOL_IP) && defined(IPPROTO_IP)	57	vpn network; // THE vpn (bad design...)
59	# define SOL_IP IPPROTO_IP
60	#endif
61		58
62	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
63		60
64	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 ()
65	{	75	{
66	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
67	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
72		82
73	char *env;	83	char *env;
74	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
75	putenv (env);
76	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
77	putenv (env);
78	asprintf (&env, "NODEID=%d", THISNODE->id);
79	putenv (env);
80	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
81	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
82	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
83	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
84	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
85	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
86	THISNODE->id & 0xff);
87	putenv (env);
88		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,
89	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;
90	}	122	}
91		123
92	int	124	int
93	vpn::setup ()	125	vpn::setup ()
94	{	126	{
		127	ipv4_tos = -1;
95	ipv4_fd = -1;	128	ipv4_fd = -1;
96		129
97	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
98	{	131	{
99	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
100		133
101	if (ipv4_fd < 0)	134	if (ipv4_fd < 0)
102	return -1;	135	return -1;
103		136
104	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
105		139
106	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
107	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
108	// nor do I fragment myself. Linux still sets DF and doesn't	142	// nor do I fragment myself. Linux still sets DF and doesn't
109	// fragment for me sometimes.	143	// fragment for me sometimes.
116	sockinfo si (THISNODE, PROT_IPv4);	150	sockinfo si (THISNODE, PROT_IPv4);
117		151
118	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
119	{	153	{
120	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	154	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
121	exit (1);	155	exit (EXIT_FAILURE);
122	}	156	}
123		157
124	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
125	}	159	}
126		160
		161	udpv4_tos = -1;
127	udpv4_fd = -1;	162	udpv4_fd = -1;
128		163
129	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
130	{	165	{
131	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
132		167
133	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
134	return -1;	169	return -1;
135		170
136	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
137		173
138	// standard daemon practise...	174	// standard daemon practise...
139	{	175	{
140	int oval = 1;	176	int oval = 1;
141	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
154	sockinfo si (THISNODE, PROT_UDPv4);	190	sockinfo si (THISNODE, PROT_UDPv4);
155		191
156	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
157	{	193	{
158	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	194	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
159	exit (1);	195	exit (EXIT_FAILURE);
160	}	196	}
161		197
162	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
163	}	199	}
164		200
		201	icmpv4_tos = -1;
165	icmpv4_fd = -1;	202	icmpv4_fd = -1;
166		203
167	#if ENABLE_ICMP	204	#if ENABLE_ICMP
168	if (THISNODE->protocols & PROT_ICMPv4)	205	if (THISNODE->protocols & PROT_ICMPv4)
169	{	206	{
170	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
171		208
172	if (icmpv4_fd < 0)	209	if (icmpv4_fd < 0)
173	return -1;	210	return -1;
174		211
175	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
176		214
177	#ifdef ICMP_FILTER	215	#ifdef ICMP_FILTER
178	{	216	{
179	icmp_filter oval;	217	icmp_filter oval;
180	oval.data = 0xffffffff;	218	oval.data = 0xffffffff;
…		…
189	// this I really consider a linux bug. I am neither connected	227	// this I really consider a linux bug. I am neither connected
190	// nor do I fragment myself. Linux still sets DF and doesn't	228	// nor do I fragment myself. Linux still sets DF and doesn't
191	// fragment for me sometimes.	229	// fragment for me sometimes.
192	{	230	{
193	int oval = IP_PMTUDISC_DONT;	231	int oval = IP_PMTUDISC_DONT;
194	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
195	}	233	}
196	#endif	234	#endif
197		235
198	sockinfo si (THISNODE, PROT_ICMPv4);	236	sockinfo si (THISNODE, PROT_ICMPv4);
199		237
200	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
201	{	239	{
202	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	240	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
203	exit (1);	241	exit (EXIT_FAILURE);
204	}	242	}
205		243
206	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
207	}	245	}
208	#endif	246	#endif
209		247
210	tcpv4_fd = -1;	248	tcpv4_fd = -1;
211		249
…		…
216		254
217	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
218	return -1;	256	return -1;
219		257
220	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
221		260
222	// standard daemon practise...	261	// standard daemon practise...
223	{	262	{
224	int oval = 1;	263	int oval = 1;
225	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
228	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
229		268
230	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
231	{	270	{
232	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	271	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
233	exit (1);	272	exit (EXIT_FAILURE);
234	}	273	}
235		274
236	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
237	{	276	{
238	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	277	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
239	exit (1);	278	exit (EXIT_FAILURE);
		279	}
		280
		281	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		282	}
		283	#endif
		284
		285	dnsv4_tos = -1;
		286	dnsv4_fd = -1;
		287
		288	#if ENABLE_DNS
		289	if (THISNODE->protocols & PROT_DNSv4)
		290	{
		291	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		292
		293	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		294
		295	if (dnsv4_fd < 0)
		296	return -1;
		297
		298	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		299	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		300
		301	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		302	// this I really consider a linux bug. I am neither connected
		303	// nor do I fragment myself. Linux still sets DF and doesn't
		304	// fragment for me sometimes.
		305	{
		306	int oval = IP_PMTUDISC_DONT;
		307	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
240	}	308	}
241
242	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
243	}
244	#endif	309	# endif
		310
		311	// standard daemon practise...
		312	{
		313	int oval = 1;
		314	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		315	}
		316
		317	sockinfo si (THISNODE->dns_hostname,
		318	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		319	PROT_DNSv4);
		320
		321	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		322	{
		323	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		324	exit (EXIT_FAILURE);
		325	}
		326
		327	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		328	}
		329	#endif
		330
		331	/////////////////////////////////////////////////////////////////////////////
		332
		333	reconnect_all ();
		334
		335	/////////////////////////////////////////////////////////////////////////////
245		336
246	tap = new tap_device ();	337	tap = new tap_device ();
247	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
248	{	339	{
249	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
250	exit (1);	341	exit (EXIT_FAILURE);
251	}	342	}
252		343
253	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
254		345
		346	run_script_cb cb;
		347	cb.set<vpn, &vpn::script_if_init> (this);
		348
		349	if (tap->if_up () &&
		350	!run_script (cb, true))
		351	{
		352	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		353	tap->if_up ());
		354	exit (EXIT_FAILURE);
		355	}
		356
		357	cb.set<vpn, &vpn::script_if_up> (this);
		358	if (!run_script (cb, true))
		359	{
		360	slog (L_ERR, _("if-up command execution failed, exiting."));
		361	exit (EXIT_FAILURE);
		362	}
		363
255	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
256
257	reconnect_all ();
258		365
259	return 0;	366	return 0;
260	}
261
262	// send a vpn packet out to other hosts
263	bool
264	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
265	{
266	switch (si.prot)
267	{
268	case PROT_IPv4:
269	return send_ipv4_packet (pkt, si, tos);
270
271	case PROT_UDPv4:
272	return send_udpv4_packet (pkt, si, tos);
273
274	#if ENABLE_TCP
275	case PROT_TCPv4:
276	return send_tcpv4_packet (pkt, si, tos);
277	#endif
278
279	#if ENABLE_ICMP
280	case PROT_ICMPv4:
281	return send_icmpv4_packet (pkt, si, tos);
282	#endif
283
284	default:
285	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
286	return false;
287	}
288	}	367	}
289		368
290	bool	369	bool
291	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	370	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
292	{	371	{
293	#if defined(SOL_IP) && defined(IP_TOS)	372	set_tos (ipv4_fd, ipv4_tos, tos);
294	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
295	#endif
296	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	373	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
297		374
298	return true;	375	return true;
299	}	376	}
300		377
…		…
320		397
321	return ~sum;	398	return ~sum;
322	}	399	}
323		400
324	#if ENABLE_ICMP	401	#if ENABLE_ICMP
325	struct icmp_header {
326	u8 type;
327	u8 code;
328	u16 checksum;
329	union {
330	struct {
331	u16 id;
332	u16 sequence;
333	} echo;
334	u32 gateway;
335	struct {
336	u16 unused;
337	u16 mtu;
338	} frag;
339	} un;
340	};
341
342	bool	402	bool
343	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	403	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
344	{	404	{
345	#if defined(SOL_IP) && defined(IP_TOS)
346	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
347	#endif
348
349	pkt->unshift_hdr (4);	405	pkt->unshift_hdr (4);
350		406
351	icmp_header hdr = (icmp_header )&((*pkt)[0]);	407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
352	hdr->type = ::conf.icmp_type;	408	hdr->type = ::conf.icmp_type;
353	hdr->code = 255;	409	hdr->code = 255;
354	hdr->checksum = 0;	410	hdr->checksum = 0;
355	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
356		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
357	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	414	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
358		415
359	return true;	416	return true;
360	}	417	}
361	#endif	418	#endif
362		419
363	bool	420	bool
364	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	421	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
365	{	422	{
366	#if defined(SOL_IP) && defined(IP_TOS)	423	set_tos (udpv4_fd, udpv4_tos, tos);
367	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
368	#endif
369	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	424	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
370		425
371	return true;	426	return true;
		427	}
		428
		429	void
		430	vpn::inject_data_packet (tap_packet *pkt, int dst)
		431	{
		432	if (dst)
		433	{
		434	// unicast
		435	if (dst != THISNODE->id)
		436	conns[dst - 1]->inject_data_packet (pkt);
		437	}
		438	else
		439	{
		440	// broadcast, this is ugly, but due to the security policy
		441	// we have to connect to all hosts...
		442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		443	if ((*c)->conf != THISNODE)
		444	(*c)->inject_data_packet (pkt);
		445	}
372	}	446	}
373		447
374	void	448	void
375	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
376	{	450	{
…		…
393	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
394		468
395	if (dst == 0)	469	if (dst == 0)
396	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
397	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
398	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
399	{	473	{
400	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
401	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
402	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
403	else	477	else
…		…
409	else	483	else
410	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
411	}	485	}
412	}	486	}
413		487
414	void	488	bool
		489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		490	{
		491	switch (si.prot)
		492	{
		493	case PROT_IPv4:
		494	return send_ipv4_packet (pkt, si, tos);
		495
		496	case PROT_UDPv4:
		497	return send_udpv4_packet (pkt, si, tos);
		498
		499	#if ENABLE_TCP
		500	case PROT_TCPv4:
		501	return send_tcpv4_packet (pkt, si, tos);
		502	#endif
		503	#if ENABLE_ICMP
		504	case PROT_ICMPv4:
		505	return send_icmpv4_packet (pkt, si, tos);
		506	#endif
		507	#if ENABLE_DNS
		508	case PROT_DNSv4:
		509	return send_dnsv4_packet (pkt, si, tos);
		510	#endif
		511	default:
		512	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		513	}
		514
		515	return false;
		516	}
		517
		518	inline void
415	vpn::ipv4_ev (io_watcher &w, short revents)	519	vpn::ipv4_ev (ev::io &w, int revents)
416	{	520	{
417	if (revents & (POLLIN \| POLLERR))	521	if (revents & EV_READ)
418	{	522	{
419	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
420	struct sockaddr_in sa;	524	struct sockaddr_in sa;
421	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
422	int len;	526	int len;
…		…
427		531
428	if (len > 0)	532	if (len > 0)
429	{	533	{
430	pkt->len = len;	534	pkt->len = len;
431		535
432	// raw sockets deliver the ipv4, but don't expect it on sends	536	// raw sockets deliver the ipv4 header, but don't expect it on sends
433	// this is slow, but...
434	pkt->skip_hdr (IP_OVERHEAD);	537	pkt->skip_hdr (IP_OVERHEAD);
435		538
436	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
437	}	540	}
438	else	541	else
…		…
441	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
442	}	545	}
443		546
444	delete pkt;	547	delete pkt;
445	}	548	}
446	else if (revents & POLLHUP)
447	{
448	// this cannot ;) happen on udp sockets
449	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
450	exit (1);
451	}
452	else	549	else
453	{	550	{
454	slog (L_ERR,	551	slog (L_ERR,
455	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, terminating\n"),
456	revents);	553	revents);
457	exit (1);	554	exit (EXIT_FAILURE);
458	}	555	}
459	}	556	}
460		557
461	#if ENABLE_ICMP	558	#if ENABLE_ICMP
462	void	559	inline void
463	vpn::icmpv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
464	{	561	{
465	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
466	{	563	{
467	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
468	struct sockaddr_in sa;	565	struct sockaddr_in sa;
469	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
470	int len;	567	int len;
…		…
495	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
496	}	593	}
497		594
498	delete pkt;	595	delete pkt;
499	}	596	}
500	else if (revents & POLLHUP)
501	{
502	// this cannot ;) happen on udp sockets
503	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
504	exit (1);
505	}
506	else	597	else
507	{	598	{
508	slog (L_ERR,	599	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, terminating\n"),
510	revents);	601	revents);
511	exit (1);	602	exit (EXIT_FAILURE);
512	}	603	}
513	}	604	}
514	#endif	605	#endif
515		606
516	void	607	inline void
517	vpn::udpv4_ev (io_watcher &w, short revents)	608	vpn::udpv4_ev (ev::io &w, int revents)
518	{	609	{
519	if (revents & (POLLIN \| POLLERR))	610	if (revents & EV_READ)
520	{	611	{
521	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
522	struct sockaddr_in sa;	613	struct sockaddr_in sa;
523	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
524	int len;	615	int len;
…		…
539	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	630	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
540	}	631	}
541		632
542	delete pkt;	633	delete pkt;
543	}	634	}
544	else if (revents & POLLHUP)
545	{
546	// this cannot ;) happen on udp sockets
547	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
548	exit (1);
549	}
550	else	635	else
551	{	636	{
552	slog (L_ERR,	637	slog (L_ERR,
553	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, terminating\n"),
554	revents);	639	revents);
555	exit (1);	640	exit (EXIT_FAILURE);
556	}	641	}
557	}	642	}
558		643
559	void	644	inline void
560	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
561	{	646	{
562	if (revents & POLLIN)	647	if (revents & EV_READ)
563	{	648	{
564	/* process data */	649	/* process data */
565	tap_packet *pkt;	650	tap_packet *pkt;
566		651
567	pkt = tap->recv ();	652	pkt = tap->recv ();
568		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
569	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
570	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
571		661
572	if (src != THISNODE->id)	662	if (src != THISNODE->id)
573	{
574	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
575	exit (1);
576	}
577
578	if (dst == THISNODE->id)
579	{
580	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
581	exit (1);
582	}
583
584	if (dst > conns.size ())
585	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
586	else
587	{
588	if (dst)
589	{	663	{
590	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
591	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
592	conns[dst - 1]->inject_data_packet (pkt);
593	}	666	}
		667
		668	if (dst == THISNODE->id)
		669	{
		670	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		671	exit (EXIT_FAILURE);
		672	}
		673
		674	if (dst > conns.size ())
		675	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
594	else	676	else
595	{
596	// broadcast, this is ugly, but due to the security policy
597	// we have to connect to all hosts...
598	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
599	if ((*c)->conf != THISNODE)
600	(*c)->inject_data_packet (pkt);	677	inject_data_packet (pkt, dst);
601	}
602	}	678	}
603		679
604	delete pkt;	680	delete pkt;
605	}
606	else if (revents & (POLLHUP \| POLLERR))
607	{
608	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
609	exit (1);
610	}	681	}
611	else	682	else
612	abort ();	683	abort ();
613	}	684	}
614		685
615	void	686	inline void
616	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
617	{	688	{
618	if (events)	689	if (events)
619	{	690	{
620	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
621	{	692	{
622	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
623		694
624	shutdown_all ();	695	shutdown_all ();
625
626	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
627
628	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("terminating"));
629		698	exit (EXIT_SUCCESS);
630	exit (0);
631	}	699	}
632		700
633	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
634	{	702	{
635	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect"));
…		…
637	reconnect_all ();	705	reconnect_all ();
638	}	706	}
639		707
640	events = 0;	708	events = 0;
641	}	709	}
642
643	w.at = TSTAMP_CANCEL;
644	}	710	}
645		711
646	void	712	void
647	vpn::shutdown_all ()	713	vpn::shutdown_all ()
648	{	714	{
…		…
661	connection_init ();	727	connection_init ();
662		728
663	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin ();
664	i != conf.nodes.end (); ++i)	730	i != conf.nodes.end (); ++i)
665	{	731	{
666	connection *conn = new connection (this);	732	connection conn = new connection (this, i);
667
668	conn->conf = *i;
669	conns.push_back (conn);	733	conns.push_back (conn);
670
671	conn->establish_connection ();	734	conn->establish_connection ();
672	}	735	}
673	}	736	}
674		737
675	connection *vpn::find_router ()	738	connection *vpn::find_router ()
…		…
720	}	783	}
721		784
722	void	785	void
723	vpn::dump_status ()	786	vpn::dump_status ()
724	{	787	{
725	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	788	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
726		789
727	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	790	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
728	(*c)->dump_status ();	791	(*c)->dump_status ();
729		792
730	slog (L_NOTICE, _("END status dump"));	793	slog (L_NOTICE, _("END status dump"));
731	}	794	}
732		795
733	vpn::vpn (void)	796	vpn::vpn (void)
		797	{
734	: event (this, &vpn::event_cb)	798	event .set<vpn, &vpn::event_cb > (this);
735	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	799	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
736	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	800	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
737	#if ENABLE_TCP	801	#if ENABLE_TCP
738	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	802	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
739	#endif	803	#endif
740	#if ENABLE_ICMP	804	#if ENABLE_ICMP
741	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	805	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
742	#endif	806	#endif
743	, tap_ev_watcher (this, &vpn::tap_ev)	807	#if ENABLE_DNS
744	{	808	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		809	#endif
		810	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
745	}	811	}
746		812
747	vpn::~vpn ()	813	vpn::~vpn ()
748	{	814	{
749	}	815	}

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/vpn.C (file contents): Revision 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC vs. Revision 1.47 by pcg, Thu Aug 7 17:54:27 2008 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.47 by pcg, Thu Aug 7 17:54:27 2008 UTC