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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.11 by pcg, Sun Apr 13 00:35:46 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 <arpa/inet.h>	47	#include <sys/socket.h>
36	#include <netinet/in.h>	48
37	#include <netinet/ip_icmp.h>	49	#include "netcompat.h"
38		50
39	#include "pidfile.h"	51	#include "pidfile.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;
73	}	122	}
74		123
75	int	124	int
76	vpn::setup ()	125	vpn::setup ()
77	{	126	{
		127	ipv4_tos = -1;
78	ipv4_fd = -1;	128	ipv4_fd = -1;
79		129
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	131	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
83		133
84	if (ipv4_fd < 0)	134	if (ipv4_fd < 0)
85	return -1;	135	return -1;
86		136
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
88		139
89	#ifdef IP_MTU_DISCOVER	140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
91	// 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
92	// fragment for me sometimes.	143	// fragment for me sometimes.
93	{	144	{
94	int oval = IP_PMTUDISC_DONT;	145	int oval = IP_PMTUDISC_DONT;
99	sockinfo si (THISNODE, PROT_IPv4);	150	sockinfo si (THISNODE, PROT_IPv4);
100		151
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	153	{
103	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));
104	exit (1);	155	exit (EXIT_FAILURE);
105	}	156	}
106		157
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
108	}	159	}
109		160
		161	udpv4_tos = -1;
110	udpv4_fd = -1;	162	udpv4_fd = -1;
111		163
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	165	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		167
116	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
117	return -1;	169	return -1;
118		170
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
120		173
121	// standard daemon practise...	174	// standard daemon practise...
122	{	175	{
123	int oval = 1;	176	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125	}	178	}
126		179
127	#ifdef IP_MTU_DISCOVER	180	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128	// this I really consider a linux bug. I am neither connected	181	// this I really consider a linux bug. I am neither connected
129	// nor do I fragment myself. Linux still sets DF and doesn't	182	// nor do I fragment myself. Linux still sets DF and doesn't
130	// fragment for me sometimes.	183	// fragment for me sometimes.
131	{	184	{
132	int oval = IP_PMTUDISC_DONT;	185	int oval = IP_PMTUDISC_DONT;
…		…
137	sockinfo si (THISNODE, PROT_UDPv4);	190	sockinfo si (THISNODE, PROT_UDPv4);
138		191
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	193	{
141	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));
142	exit (1);	195	exit (EXIT_FAILURE);
143	}	196	}
144		197
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
146	}	199	}
147		200
		201	icmpv4_tos = -1;
148	icmpv4_fd = -1;	202	icmpv4_fd = -1;
149		203
150	#if ENABLE_ICMP	204	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	205	if (THISNODE->protocols & PROT_ICMPv4)
152	{	206	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		208
155	if (icmpv4_fd < 0)	209	if (icmpv4_fd < 0)
156	return -1;	210	return -1;
157		211
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
159		214
160	#ifdef ICMP_FILTER	215	#ifdef ICMP_FILTER
161	{	216	{
162	icmp_filter oval;	217	icmp_filter oval;
163	oval.data = 0xffffffff;	218	oval.data = 0xffffffff;
…		…
166		221
167	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168	}	223	}
169	#endif	224	#endif
170		225
171	#ifdef IP_MTU_DISCOVER	226	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172	// this I really consider a linux bug. I am neither connected	227	// this I really consider a linux bug. I am neither connected
173	// 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
174	// fragment for me sometimes.	229	// fragment for me sometimes.
175	{	230	{
176	int oval = IP_PMTUDISC_DONT;	231	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	233	}
179	#endif	234	#endif
180		235
181	sockinfo si (THISNODE, PROT_ICMPv4);	236	sockinfo si (THISNODE, PROT_ICMPv4);
182		237
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	239	{
185	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));
186	exit (1);	241	exit (EXIT_FAILURE);
187	}	242	}
188		243
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
190	}	245	}
191	#endif	246	#endif
192		247
193	tcpv4_fd = -1;	248	tcpv4_fd = -1;
194		249
…		…
199		254
200	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
201	return -1;	256	return -1;
202		257
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
204		260
205	// standard daemon practise...	261	// standard daemon practise...
206	{	262	{
207	int oval = 1;	263	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
211	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
212		268
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	270	{
215	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));
216	exit (1);	272	exit (EXIT_FAILURE);
217	}	273	}
218		274
219	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
220	{	276	{
221	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));
222	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);
223	}	308	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#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	/////////////////////////////////////////////////////////////////////////////
228		336
229	tap = new tap_device ();	337	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
231	{	339	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233	exit (1);	341	exit (EXIT_FAILURE);
234	}	342	}
235		343
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		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
238	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		365
242	return 0;	366	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	}	367	}
272		368
273	bool	369	bool
274	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)
275	{	371	{
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	372	set_tos (ipv4_fd, ipv4_tos, tos);
277	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 ());
278		374
279	return true;	375	return true;
280	}	376	}
281		377
…		…
300	sum += (sum >> 16); // carry	396	sum += (sum >> 16); // carry
301		397
302	return ~sum;	398	return ~sum;
303	}	399	}
304		400
		401	#if ENABLE_ICMP
305	bool	402	bool
306	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)
307	{	404	{
308	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
309
310	pkt->unshift_hdr (4);	405	pkt->unshift_hdr (4);
311		406
312	icmphdr hdr = (icmphdr )&((*pkt)[0]);	407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
313	hdr->type = ::conf.icmp_type;	408	hdr->type = ::conf.icmp_type;
314	hdr->code = 255;	409	hdr->code = 255;
315	hdr->checksum = 0;	410	hdr->checksum = 0;
316	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
318	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 ());
319		415
320	return true;	416	return true;
321	}	417	}
		418	#endif
322		419
323	bool	420	bool
324	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)
325	{	422	{
326	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	423	set_tos (udpv4_fd, udpv4_tos, tos);
327	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 ());
328		425
329	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	}
330	}	446	}
331		447
332	void	448	void
333	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
334	{	450	{
…		…
348	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349	else	465	else
350	{	466	{
351	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
352		468
353	if (dst == 0 && !THISNODE->routerprio)	469	if (dst == 0)
354	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
356	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
357	{	473	{
358	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
359	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
360	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
361	else	477	else
…		…
367	else	483	else
368	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
369	}	485	}
370	}	486	}
371		487
372	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
373	vpn::ipv4_ev (io_watcher &w, short revents)	519	vpn::ipv4_ev (ev::io &w, int revents)
374	{	520	{
375	if (revents & (POLLIN \| POLLERR))	521	if (revents & EV_READ)
376	{	522	{
377	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
378	struct sockaddr_in sa;	524	struct sockaddr_in sa;
379	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
380	int len;	526	int len;
…		…
385		531
386	if (len > 0)	532	if (len > 0)
387	{	533	{
388	pkt->len = len;	534	pkt->len = len;
389		535
390	// 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
391	// this is slow, but...
392	pkt->skip_hdr (IP_OVERHEAD);	537	pkt->skip_hdr (IP_OVERHEAD);
393		538
394	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
395	}	540	}
396	else	541	else
…		…
399	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
400	}	545	}
401		546
402	delete pkt;	547	delete pkt;
403	}	548	}
404	else if (revents & POLLHUP)
405	{
406	// this cannot ;) happen on udp sockets
407	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
408	exit (1);
409	}
410	else	549	else
411	{	550	{
412	slog (L_ERR,	551	slog (L_ERR,
413	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, terminating\n"),
414	revents);	553	revents);
415	exit (1);	554	exit (EXIT_FAILURE);
416	}	555	}
417	}	556	}
418		557
419	void	558	#if ENABLE_ICMP
		559	inline void
420	vpn::icmpv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
421	{	561	{
422	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
423	{	563	{
424	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
425	struct sockaddr_in sa;	565	struct sockaddr_in sa;
426	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
427	int len;	567	int len;
…		…
432		572
433	if (len > 0)	573	if (len > 0)
434	{	574	{
435	pkt->len = len;	575	pkt->len = len;
436		576
437	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
438		578
439	if (hdr->type == ::conf.icmp_type	579	if (hdr->type == ::conf.icmp_type
440	&& hdr->code == 255)	580	&& hdr->code == 255)
441	{	581	{
442	// raw sockets deliver the ipv4, but don't expect it on sends	582	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
452	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
453	}	593	}
454		594
455	delete pkt;	595	delete pkt;
456	}	596	}
457	else if (revents & POLLHUP)
458	{
459	// this cannot ;) happen on udp sockets
460	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
461	exit (1);
462	}
463	else	597	else
464	{	598	{
465	slog (L_ERR,	599	slog (L_ERR,
466	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, terminating\n"),
467	revents);	601	revents);
468	exit (1);	602	exit (EXIT_FAILURE);
469	}	603	}
470	}	604	}
		605	#endif
471		606
472	void	607	inline void
473	vpn::udpv4_ev (io_watcher &w, short revents)	608	vpn::udpv4_ev (ev::io &w, int revents)
474	{	609	{
475	if (revents & (POLLIN \| POLLERR))	610	if (revents & EV_READ)
476	{	611	{
477	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
478	struct sockaddr_in sa;	613	struct sockaddr_in sa;
479	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
480	int len;	615	int len;
…		…
495	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));
496	}	631	}
497		632
498	delete pkt;	633	delete pkt;
499	}	634	}
500	else if (revents & POLLHUP)
501	{
502	// this cannot ;) happen on udp sockets
503	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
504	exit (1);
505	}
506	else	635	else
507	{	636	{
508	slog (L_ERR,	637	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, terminating\n"),
510	revents);	639	revents);
511	exit (1);	640	exit (EXIT_FAILURE);
512	}	641	}
513	}	642	}
514		643
515	void	644	inline void
516	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
517	{	646	{
518	if (revents & POLLIN)	647	if (revents & EV_READ)
519	{	648	{
520	/* process data */	649	/* process data */
521	tap_packet *pkt;	650	tap_packet *pkt;
522		651
523	pkt = tap->recv ();	652	pkt = tap->recv ();
524		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
525	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
526	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
527		661
528	if (src != THISNODE->id)	662	if (src != THISNODE->id)
529	{
530	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
531	exit (1);
532	}
533
534	if (dst == THISNODE->id)
535	{
536	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
537	exit (1);
538	}
539
540	if (dst > conns.size ())
541	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
542	else
543	{
544	if (dst)
545	{	663	{
546	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
547	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
548	conns[dst - 1]->inject_data_packet (pkt);
549	}	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);
550	else	676	else
551	{
552	// broadcast, first check router, then self, then english
553	connection *router = find_router ();
554
555	if (router)
556	router->inject_data_packet (pkt, true);	677	inject_data_packet (pkt, dst);
557	else
558	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
559	if ((*c)->conf != THISNODE)
560	(*c)->inject_data_packet (pkt);
561	}
562	}	678	}
563		679
564	delete pkt;	680	delete pkt;
565	}
566	else if (revents & (POLLHUP \| POLLERR))
567	{
568	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
569	exit (1);
570	}	681	}
571	else	682	else
572	abort ();	683	abort ();
573	}	684	}
574		685
575	void	686	inline void
576	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
577	{	688	{
578	if (events)	689	if (events)
579	{	690	{
580	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
581	{	692	{
582	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
583		694
584	shutdown_all ();	695	shutdown_all ();
585
586	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
587
588	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("terminating"));
589		698	exit (EXIT_SUCCESS);
590	exit (0);
591	}	699	}
592		700
593	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
594	{	702	{
595	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect"));
…		…
597	reconnect_all ();	705	reconnect_all ();
598	}	706	}
599		707
600	events = 0;	708	events = 0;
601	}	709	}
602
603	w.at = TSTAMP_CANCEL;
604	}	710	}
605		711
606	void	712	void
607	vpn::shutdown_all ()	713	vpn::shutdown_all ()
608	{	714	{
…		…
621	connection_init ();	727	connection_init ();
622		728
623	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin ();
624	i != conf.nodes.end (); ++i)	730	i != conf.nodes.end (); ++i)
625	{	731	{
626	connection *conn = new connection (this);	732	connection conn = new connection (this, i);
627
628	conn->conf = *i;
629	conns.push_back (conn);	733	conns.push_back (conn);
630
631	conn->establish_connection ();	734	conn->establish_connection ();
632	}	735	}
633	}	736	}
634		737
635	connection *vpn::find_router ()	738	connection *vpn::find_router ()
636	{	739	{
637	u32 prio = 0;	740	u32 prio = 1;
638	connection *router = 0;	741	connection *router = 0;
639		742
640	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	743	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641	{	744	{
642	connection c = i;	745	connection c = i;
643		746
644	if (c->conf->routerprio > prio	747	if (c->conf->routerprio > prio
645	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	748	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646	&& c->ictx && c->octx	749	&& c->ictx && c->octx
647	&& c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode	750	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648	&& (!THISNODE->routerprio
649	\|\| c->conf->routerprio <= THISNODE->routerprio))
650	{	751	{
651	prio = c->conf->routerprio;	752	prio = c->conf->routerprio;
652	router = c;	753	router = c;
653	}	754	}
654	}	755	}
…		…
663	if (c)	764	if (c)
664	c->send_connect_request (id);	765	c->send_connect_request (id);
665	else	766	else
666	// no router found, aggressively connect to all routers	767	// no router found, aggressively connect to all routers
667	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	768	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668	if ((*i)->conf->routerprio)	769	if ((i)->conf->routerprio && (i)->conf != THISNODE)
669	(*i)->establish_connection ();	770	(*i)->establish_connection ();
670	}	771	}
671		772
672	void	773	void
673	connection::dump_status ()	774	connection::dump_status ()
…		…
682	}	783	}
683		784
684	void	785	void
685	vpn::dump_status ()	786	vpn::dump_status ()
686	{	787	{
687	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	788	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
688		789
689	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	790	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
690	(*c)->dump_status ();	791	(*c)->dump_status ();
691		792
692	slog (L_NOTICE, _("END status dump"));	793	slog (L_NOTICE, _("END status dump"));
693	}	794	}
694		795
695	vpn::vpn (void)	796	vpn::vpn (void)
		797	{
696	: event (this, &vpn::event_cb)	798	event .set<vpn, &vpn::event_cb > (this);
697	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	799	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
698	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	800	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
699	#if ENABLE_TCP	801	#if ENABLE_TCP
700	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	802	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
701	#endif	803	#endif
702	#if ENABLE_ICMP	804	#if ENABLE_ICMP
703	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	805	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
704	#endif	806	#endif
705	, tap_ev_watcher (this, &vpn::tap_ev)	807	#if ENABLE_DNS
706	{	808	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		809	#endif
		810	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
707	}	811	}
708		812
709	vpn::~vpn ()	813	vpn::~vpn ()
710	{	814	{
711	}	815	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.11 by pcg, Sun Apr 13 00:35:46 2003 UTC vs. Revision 1.47 by pcg, Thu Aug 7 17:54:27 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.11 by pcg, Sun Apr 13 00:35:46 2003 UTC vs.
Revision 1.47 by pcg, Thu Aug 7 17:54:27 2008 UTC