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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.12 by pcg, Sun Apr 13 00:42:04 2003 UTC vs.
Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2005 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
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your 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,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but 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
12	GNU General Public License for more details.	15	GNU General 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
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <errno.h>	33	#include <errno.h>
32	#include <time.h>	34	#include <time.h>
33	#include <unistd.h>	35	#include <unistd.h>
34	#include <fcntl.h>	36	#include <fcntl.h>
35	#include <arpa/inet.h>	37	#include <sys/socket.h>
36	#include <netinet/in.h>	38
37	#include <netinet/ip_icmp.h>	39	#include "netcompat.h"
38		40
39	#include "pidfile.h"	41	#include "pidfile.h"
40		42
41	#include "connection.h"	43	#include "connection.h"
42	#include "util.h"	44	#include "util.h"
43	#include "vpn.h"	45	#include "vpn.h"
44		46
		47	vpn network; // THE vpn (bad design...)
		48
45	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
46		50
47	const char *vpn::script_if_up ()	51	void
		52	vpn::script_init_env ()
48	{	53	{
49	// the tunnel device mtu should be the physical mtu - overhead	54	// the tunnel device mtu should be the physical mtu - overhead
50	// the tricky part is rounding to the cipher key blocksize	55	// the tricky part is rounding to the cipher key blocksize
51	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
52	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55		60
56	char *env;	61	char *env;
57	asprintf (&env, "CONFBASE=%s", confbase);	62	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 ());	63	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64	putenv (env);	64	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		65	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu);	66	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	putenv (env);	67	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69	THISNODE->id & 0xff);
70	putenv (env);
71		69
		70	conns [THISNODE->id - 1]->script_init_env ("");
		71
		72	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		73	{
		74	char ext[16];
		75	snprintf (ext, 16, "_%d", (*c)->conf->id);
		76	(*c)->script_init_env (ext);
		77	}
		78	}
		79
		80	const char *vpn::script_if_init ()
		81	{
		82	script_init_env ();
		83
		84	return tap->if_up ();
		85	}
		86
		87	const char *vpn::script_if_up ()
		88	{
		89	script_init_env ();
		90
		91	char *filename;
		92	asprintf (&filename,
		93	"%s/%s",
		94	confbase,
72	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	95	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		96
		97	return filename;
73	}	98	}
74		99
75	int	100	int
76	vpn::setup ()	101	vpn::setup ()
77	{	102	{
84	if (ipv4_fd < 0)	109	if (ipv4_fd < 0)
85	return -1;	110	return -1;
86		111
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	112	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88		113
89	#ifdef IP_MTU_DISCOVER	114	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	115	// this I really consider a linux bug. I am neither connected
91	// nor do I fragment myself. Linux still sets DF and doesn't	116	// nor do I fragment myself. Linux still sets DF and doesn't
92	// fragment for me sometimes.	117	// fragment for me sometimes.
93	{	118	{
94	int oval = IP_PMTUDISC_DONT;	119	int oval = IP_PMTUDISC_DONT;
…		…
99	sockinfo si (THISNODE, PROT_IPv4);	124	sockinfo si (THISNODE, PROT_IPv4);
100		125
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	126	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	127	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	128	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
104	exit (1);	129	exit (EXIT_FAILURE);
105	}	130	}
106		131
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	132	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
108	}	133	}
109		134
110	udpv4_fd = -1;	135	udpv4_fd = -1;
111		136
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	137	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
…		…
122	{	147	{
123	int oval = 1;	148	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	149	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125	}	150	}
126		151
127	#ifdef IP_MTU_DISCOVER	152	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128	// this I really consider a linux bug. I am neither connected	153	// this I really consider a linux bug. I am neither connected
129	// nor do I fragment myself. Linux still sets DF and doesn't	154	// nor do I fragment myself. Linux still sets DF and doesn't
130	// fragment for me sometimes.	155	// fragment for me sometimes.
131	{	156	{
132	int oval = IP_PMTUDISC_DONT;	157	int oval = IP_PMTUDISC_DONT;
…		…
137	sockinfo si (THISNODE, PROT_UDPv4);	162	sockinfo si (THISNODE, PROT_UDPv4);
138		163
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	164	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	165	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	166	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
142	exit (1);	167	exit (EXIT_FAILURE);
143	}	168	}
144		169
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	170	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
146	}	171	}
147		172
148	icmpv4_fd = -1;	173	icmpv4_fd = -1;
149		174
150	#if ENABLE_ICMP	175	#if ENABLE_ICMP
…		…
166		191
167	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	192	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168	}	193	}
169	#endif	194	#endif
170		195
171	#ifdef IP_MTU_DISCOVER	196	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172	// this I really consider a linux bug. I am neither connected	197	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	198	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	199	// fragment for me sometimes.
175	{	200	{
176	int oval = IP_PMTUDISC_DONT;	201	int oval = IP_PMTUDISC_DONT;
…		…
181	sockinfo si (THISNODE, PROT_ICMPv4);	206	sockinfo si (THISNODE, PROT_ICMPv4);
182		207
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	208	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	209	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	210	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
186	exit (1);	211	exit (EXIT_FAILURE);
187	}	212	}
188		213
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	214	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
190	}	215	}
191	#endif	216	#endif
192		217
193	tcpv4_fd = -1;	218	tcpv4_fd = -1;
194		219
…		…
211	sockinfo si (THISNODE, PROT_TCPv4);	236	sockinfo si (THISNODE, PROT_TCPv4);
212		237
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	239	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	240	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
216	exit (1);	241	exit (EXIT_FAILURE);
217	}	242	}
218		243
219	if (listen (tcpv4_fd, 5))	244	if (listen (tcpv4_fd, 5))
220	{	245	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	246	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
222	exit (1);	247	exit (EXIT_FAILURE);
		248	}
		249
		250	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		251	}
		252	#endif
		253
		254	#if ENABLE_DNS
		255	if (THISNODE->protocols & PROT_DNSv4)
		256	{
		257	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		258
		259	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		260
		261	if (dnsv4_fd < 0)
		262	return -1;
		263
		264	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		265	// this I really consider a linux bug. I am neither connected
		266	// nor do I fragment myself. Linux still sets DF and doesn't
		267	// fragment for me sometimes.
		268	{
		269	int oval = IP_PMTUDISC_DONT;
		270	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		271	}
		272	#endif
		273
		274	// standard daemon practise...
		275	{
		276	int oval = 1;
		277	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		278	}
		279
		280	sockinfo si (THISNODE->dns_hostname,
		281	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		282	PROT_DNSv4);
		283
		284	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
223	}	285	{
		286	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		287	exit (EXIT_FAILURE);
		288	}
224		289
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	290	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
226	}	291	}
227	#endif	292	#endif
		293
		294	/////////////////////////////////////////////////////////////////////////////
		295
		296	reconnect_all ();
		297
		298	/////////////////////////////////////////////////////////////////////////////
228		299
229	tap = new tap_device ();	300	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	301	if (!tap) //D this, of course, never catches
231	{	302	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	303	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233	exit (1);	304	exit (EXIT_FAILURE);
234	}	305	}
235		306
		307	if (tap->if_up () &&
		308	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		309	{
		310	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		311	tap->if_up ());
		312	exit (EXIT_FAILURE);
		313	}
		314
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	315	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		316	{
		317	slog (L_ERR, _("if-up command execution failed, exiting."));
		318	exit (EXIT_FAILURE);
		319	}
237		320
238	tap_ev_watcher.start (tap->fd, POLLIN);	321	tap_ev_watcher.start (tap->fd, EVENT_READ);
239
240	reconnect_all ();
241		322
242	return 0;	323	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	}	324	}
272		325
273	bool	326	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	327	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	328	{
		329	#if defined(SOL_IP) && defined(IP_TOS)
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	330	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		331	#endif
277	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	332	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278		333
279	return true;	334	return true;
280	}	335	}
281		336
…		…
300	sum += (sum >> 16); // carry	355	sum += (sum >> 16); // carry
301		356
302	return ~sum;	357	return ~sum;
303	}	358	}
304		359
		360	#if ENABLE_ICMP
305	bool	361	bool
306	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	362	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307	{	363	{
		364	#if defined(SOL_IP) && defined(IP_TOS)
308	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	365	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		366	#endif
309		367
310	pkt->unshift_hdr (4);	368	pkt->unshift_hdr (4);
311		369
312	icmphdr hdr = (icmphdr )&((*pkt)[0]);	370	icmp_header hdr = (icmp_header )&((*pkt)[0]);
313	hdr->type = ::conf.icmp_type;	371	hdr->type = ::conf.icmp_type;
314	hdr->code = 255;	372	hdr->code = 255;
315	hdr->checksum = 0;	373	hdr->checksum = 0;
316	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	374	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317		375
318	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	376	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		377
320	return true;	378	return true;
321	}	379	}
		380	#endif
322		381
323	bool	382	bool
324	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	383	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
325	{	384	{
		385	#if defined(SOL_IP) && defined(IP_TOS)
326	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	386	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		387	#endif
327	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	388	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
328		389
329	return true;	390	return true;
		391	}
		392
		393	void
		394	vpn::inject_data_packet (tap_packet *pkt, int dst)
		395	{
		396	if (dst)
		397	{
		398	// unicast
		399	if (dst != THISNODE->id)
		400	conns[dst - 1]->inject_data_packet (pkt);
		401	}
		402	else
		403	{
		404	// broadcast, this is ugly, but due to the security policy
		405	// we have to connect to all hosts...
		406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		407	if ((*c)->conf != THISNODE)
		408	(*c)->inject_data_packet (pkt, true);
		409	}
330	}	410	}
331		411
332	void	412	void
333	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	413	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
334	{	414	{
…		…
348	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	428	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349	else	429	else
350	{	430	{
351	connection *c = conns[src - 1];	431	connection *c = conns[src - 1];
352		432
353	if (dst == 0 && !THISNODE->routerprio)	433	if (dst == 0)
354	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	434	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355	c->conf->nodename, (const char *)rsi);	435	c->conf->nodename, (const char *)rsi);
356	else if (dst != 0 && dst != THISNODE->id)	436	else if (dst != THISNODE->id)
357	{	437	{
358	if (THISNODE->routerprio)	438	if (THISNODE->routerprio)
359	// the tos setting gets lost here. who cares.	439	// the tos setting gets lost here. who cares.
360	conns[dst - 1]->inject_vpn_packet (pkt);	440	conns[dst - 1]->inject_vpn_packet (pkt);
361	else	441	else
…		…
367	else	447	else
368	c->recv_vpn_packet (pkt, rsi);	448	c->recv_vpn_packet (pkt, rsi);
369	}	449	}
370	}	450	}
371		451
		452	bool
		453	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		454	{
		455	switch (si.prot)
		456	{
		457	case PROT_IPv4:
		458	return send_ipv4_packet (pkt, si, tos);
		459	case PROT_UDPv4:
		460	return send_udpv4_packet (pkt, si, tos);
		461	#if ENABLE_TCP
		462	case PROT_TCPv4:
		463	return send_tcpv4_packet (pkt, si, tos);
		464	#endif
		465	#if ENABLE_ICMP
		466	case PROT_ICMPv4:
		467	return send_icmpv4_packet (pkt, si, tos);
		468	#endif
		469	#if ENABLE_DNS
		470	case PROT_DNSv4:
		471	return send_dnsv4_packet (pkt, si, tos);
		472	#endif
		473
		474	default:
		475	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		476	}
		477
		478	return false;
		479	}
		480
372	void	481	void
373	vpn::ipv4_ev (io_watcher &w, short revents)	482	vpn::ipv4_ev (io_watcher &w, short revents)
374	{	483	{
375	if (revents & (POLLIN \| POLLERR))	484	if (revents & EVENT_READ)
376	{	485	{
377	vpn_packet *pkt = new vpn_packet;	486	vpn_packet *pkt = new vpn_packet;
378	struct sockaddr_in sa;	487	struct sockaddr_in sa;
379	socklen_t sa_len = sizeof (sa);	488	socklen_t sa_len = sizeof (sa);
380	int len;	489	int len;
…		…
385		494
386	if (len > 0)	495	if (len > 0)
387	{	496	{
388	pkt->len = len;	497	pkt->len = len;
389		498
390	// raw sockets deliver the ipv4, but don't expect it on sends	499	// raw sockets deliver the ipv4 header, but don't expect it on sends
391	// this is slow, but...
392	pkt->skip_hdr (IP_OVERHEAD);	500	pkt->skip_hdr (IP_OVERHEAD);
393		501
394	recv_vpn_packet (pkt, si);	502	recv_vpn_packet (pkt, si);
395	}	503	}
396	else	504	else
…		…
399	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	507	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
400	}	508	}
401		509
402	delete pkt;	510	delete pkt;
403	}	511	}
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	512	else
411	{	513	{
412	slog (L_ERR,	514	slog (L_ERR,
413	_("FATAL: unknown revents %08x in socket, terminating\n"),	515	_("FATAL: unknown revents %08x in socket, terminating\n"),
414	revents);	516	revents);
415	exit (1);	517	exit (EXIT_FAILURE);
416	}	518	}
417	}	519	}
418		520
		521	#if ENABLE_ICMP
419	void	522	void
420	vpn::icmpv4_ev (io_watcher &w, short revents)	523	vpn::icmpv4_ev (io_watcher &w, short revents)
421	{	524	{
422	if (revents & (POLLIN \| POLLERR))	525	if (revents & EVENT_READ)
423	{	526	{
424	vpn_packet *pkt = new vpn_packet;	527	vpn_packet *pkt = new vpn_packet;
425	struct sockaddr_in sa;	528	struct sockaddr_in sa;
426	socklen_t sa_len = sizeof (sa);	529	socklen_t sa_len = sizeof (sa);
427	int len;	530	int len;
…		…
432		535
433	if (len > 0)	536	if (len > 0)
434	{	537	{
435	pkt->len = len;	538	pkt->len = len;
436		539
437	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	540	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
438		541
439	if (hdr->type == ::conf.icmp_type	542	if (hdr->type == ::conf.icmp_type
440	&& hdr->code == 255)	543	&& hdr->code == 255)
441	{	544	{
442	// raw sockets deliver the ipv4, but don't expect it on sends	545	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
452	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	555	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
453	}	556	}
454		557
455	delete pkt;	558	delete pkt;
456	}	559	}
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	560	else
464	{	561	{
465	slog (L_ERR,	562	slog (L_ERR,
466	_("FATAL: unknown revents %08x in socket, terminating\n"),	563	_("FATAL: unknown revents %08x in socket, terminating\n"),
467	revents);	564	revents);
468	exit (1);	565	exit (EXIT_FAILURE);
469	}	566	}
470	}	567	}
		568	#endif
471		569
472	void	570	void
473	vpn::udpv4_ev (io_watcher &w, short revents)	571	vpn::udpv4_ev (io_watcher &w, short revents)
474	{	572	{
475	if (revents & (POLLIN \| POLLERR))	573	if (revents & EVENT_READ)
476	{	574	{
477	vpn_packet *pkt = new vpn_packet;	575	vpn_packet *pkt = new vpn_packet;
478	struct sockaddr_in sa;	576	struct sockaddr_in sa;
479	socklen_t sa_len = sizeof (sa);	577	socklen_t sa_len = sizeof (sa);
480	int len;	578	int len;
…		…
495	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	593	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
496	}	594	}
497		595
498	delete pkt;	596	delete pkt;
499	}	597	}
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	598	else
507	{	599	{
508	slog (L_ERR,	600	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	601	_("FATAL: unknown revents %08x in socket, terminating\n"),
510	revents);	602	revents);
511	exit (1);	603	exit (EXIT_FAILURE);
512	}	604	}
513	}	605	}
514		606
515	void	607	void
516	vpn::tap_ev (io_watcher &w, short revents)	608	vpn::tap_ev (io_watcher &w, short revents)
517	{	609	{
518	if (revents & POLLIN)	610	if (revents & EVENT_READ)
519	{	611	{
520	/* process data */	612	/* process data */
521	tap_packet *pkt;	613	tap_packet *pkt;
522		614
523	pkt = tap->recv ();	615	pkt = tap->recv ();
524		616
		617	if (!pkt)
		618	return;
		619
		620	if (pkt->len > 14)
		621	{
525	int dst = mac2id (pkt->dst);	622	int dst = mac2id (pkt->dst);
526	int src = mac2id (pkt->src);	623	int src = mac2id (pkt->src);
527		624
528	if (src != THISNODE->id)	625	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	{	626	{
546	// unicast	627	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
547	if (dst != THISNODE->id)	628	exit (EXIT_FAILURE);
548	conns[dst - 1]->inject_data_packet (pkt);
549	}	629	}
		630
		631	if (dst == THISNODE->id)
		632	{
		633	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		634	exit (EXIT_FAILURE);
		635	}
		636
		637	if (dst > conns.size ())
		638	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
550	else	639	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);	640	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	}	641	}
563		642
564	delete pkt;	643	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	}	644	}
571	else	645	else
572	abort ();	646	abort ();
573	}	647	}
574		648
…		…
580	if (events & EVENT_SHUTDOWN)	654	if (events & EVENT_SHUTDOWN)
581	{	655	{
582	slog (L_INFO, _("preparing shutdown..."));	656	slog (L_INFO, _("preparing shutdown..."));
583		657
584	shutdown_all ();	658	shutdown_all ();
585
586	remove_pid (pidfilename);	659	remove_pid (conf.pidfilename);
587
588	slog (L_INFO, _("terminating"));	660	slog (L_INFO, _("terminating"));
589		661	exit (EXIT_SUCCESS);
590	exit (0);
591	}	662	}
592		663
593	if (events & EVENT_RECONNECT)	664	if (events & EVENT_RECONNECT)
594	{	665	{
595	slog (L_INFO, _("forced reconnect"));	666	slog (L_INFO, _("forced reconnect"));
…		…
597	reconnect_all ();	668	reconnect_all ();
598	}	669	}
599		670
600	events = 0;	671	events = 0;
601	}	672	}
602
603	w.at = TSTAMP_CANCEL;
604	}	673	}
605		674
606	void	675	void
607	vpn::shutdown_all ()	676	vpn::shutdown_all ()
608	{	677	{
…		…
621	connection_init ();	690	connection_init ();
622		691
623	for (configuration::node_vector::iterator i = conf.nodes.begin ();	692	for (configuration::node_vector::iterator i = conf.nodes.begin ();
624	i != conf.nodes.end (); ++i)	693	i != conf.nodes.end (); ++i)
625	{	694	{
626	connection *conn = new connection (this);	695	connection conn = new connection (this, i);
627
628	conn->conf = *i;
629	conns.push_back (conn);	696	conns.push_back (conn);
630
631	conn->establish_connection ();	697	conn->establish_connection ();
632	}	698	}
633	}	699	}
634		700
635	connection *vpn::find_router ()	701	connection *vpn::find_router ()
…		…
639		705
640	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	706	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641	{	707	{
642	connection c = i;	708	connection c = i;
643		709
644	if (c->conf->routerprio >= prio	710	if (c->conf->routerprio > prio
645	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	711	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646	&& c->ictx && c->octx	712	&& c->ictx && c->octx
647	&& c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode	713	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648	&& (!THISNODE->routerprio
649	\|\| c->conf->routerprio <= THISNODE->routerprio))
650	{	714	{
651	prio = c->conf->routerprio;	715	prio = c->conf->routerprio;
652	router = c;	716	router = c;
653	}	717	}
654	}	718	}
…		…
663	if (c)	727	if (c)
664	c->send_connect_request (id);	728	c->send_connect_request (id);
665	else	729	else
666	// no router found, aggressively connect to all routers	730	// no router found, aggressively connect to all routers
667	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668	if ((*i)->conf->routerprio)	732	if ((i)->conf->routerprio && (i)->conf != THISNODE)
669	(*i)->establish_connection ();	733	(*i)->establish_connection ();
670	}	734	}
671		735
672	void	736	void
673	connection::dump_status ()	737	connection::dump_status ()
…		…
700	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	764	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
701	#endif	765	#endif
702	#if ENABLE_ICMP	766	#if ENABLE_ICMP
703	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	767	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
704	#endif	768	#endif
		769	#if ENABLE_DNS
		770	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		771	#endif
705	, tap_ev_watcher (this, &vpn::tap_ev)	772	, tap_ev_watcher (this, &vpn::tap_ev)
706	{	773	{
707	}	774	}
708		775
709	vpn::~vpn ()	776	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.12 by pcg, Sun Apr 13 00:42:04 2003 UTC vs. Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.12 by pcg, Sun Apr 13 00:42:04 2003 UTC vs.
Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC