[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 1.38 by pcg, Tue Apr 26 00:55:56 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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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	{
83		108
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);
		113	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
88		114
89	#ifdef IP_MTU_DISCOVER	115	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	116	// this I really consider a linux bug. I am neither connected
91	// nor do I fragment myself. Linux still sets DF and doesn't	117	// nor do I fragment myself. Linux still sets DF and doesn't
92	// fragment for me sometimes.	118	// fragment for me sometimes.
93	{	119	{
94	int oval = IP_PMTUDISC_DONT;	120	int oval = IP_PMTUDISC_DONT;
…		…
99	sockinfo si (THISNODE, PROT_IPv4);	125	sockinfo si (THISNODE, PROT_IPv4);
100		126
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	127	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	128	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	129	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
104	exit (1);	130	exit (EXIT_FAILURE);
105	}	131	}
106		132
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	133	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
108	}	134	}
109		135
110	udpv4_fd = -1;	136	udpv4_fd = -1;
111		137
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	138	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
…		…
115		141
116	if (udpv4_fd < 0)	142	if (udpv4_fd < 0)
117	return -1;	143	return -1;
118		144
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	145	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		146	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
120		147
121	// standard daemon practise...	148	// standard daemon practise...
122	{	149	{
123	int oval = 1;	150	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	151	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125	}	152	}
126		153
127	#ifdef IP_MTU_DISCOVER	154	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128	// this I really consider a linux bug. I am neither connected	155	// this I really consider a linux bug. I am neither connected
129	// nor do I fragment myself. Linux still sets DF and doesn't	156	// nor do I fragment myself. Linux still sets DF and doesn't
130	// fragment for me sometimes.	157	// fragment for me sometimes.
131	{	158	{
132	int oval = IP_PMTUDISC_DONT;	159	int oval = IP_PMTUDISC_DONT;
…		…
137	sockinfo si (THISNODE, PROT_UDPv4);	164	sockinfo si (THISNODE, PROT_UDPv4);
138		165
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	166	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	167	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	168	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
142	exit (1);	169	exit (EXIT_FAILURE);
143	}	170	}
144		171
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	172	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
146	}	173	}
147		174
148	icmpv4_fd = -1;	175	icmpv4_fd = -1;
149		176
150	#if ENABLE_ICMP	177	#if ENABLE_ICMP
…		…
154		181
155	if (icmpv4_fd < 0)	182	if (icmpv4_fd < 0)
156	return -1;	183	return -1;
157		184
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	185	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		186	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
159		187
160	#ifdef ICMP_FILTER	188	#ifdef ICMP_FILTER
161	{	189	{
162	icmp_filter oval;	190	icmp_filter oval;
163	oval.data = 0xffffffff;	191	oval.data = 0xffffffff;
…		…
166		194
167	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	195	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168	}	196	}
169	#endif	197	#endif
170		198
171	#ifdef IP_MTU_DISCOVER	199	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172	// this I really consider a linux bug. I am neither connected	200	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	201	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	202	// fragment for me sometimes.
175	{	203	{
176	int oval = IP_PMTUDISC_DONT;	204	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	205	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	206	}
179	#endif	207	#endif
180		208
181	sockinfo si (THISNODE, PROT_ICMPv4);	209	sockinfo si (THISNODE, PROT_ICMPv4);
182		210
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	211	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	212	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	213	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
186	exit (1);	214	exit (EXIT_FAILURE);
187	}	215	}
188		216
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	217	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
190	}	218	}
191	#endif	219	#endif
192		220
193	tcpv4_fd = -1;	221	tcpv4_fd = -1;
194		222
…		…
199		227
200	if (tcpv4_fd < 0)	228	if (tcpv4_fd < 0)
201	return -1;	229	return -1;
202		230
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	231	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		232	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
204		233
205	// standard daemon practise...	234	// standard daemon practise...
206	{	235	{
207	int oval = 1;	236	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	237	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
211	sockinfo si (THISNODE, PROT_TCPv4);	240	sockinfo si (THISNODE, PROT_TCPv4);
212		241
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	242	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	243	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	244	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
216	exit (1);	245	exit (EXIT_FAILURE);
217	}	246	}
218		247
219	if (listen (tcpv4_fd, 5))	248	if (listen (tcpv4_fd, 5))
220	{	249	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	250	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
222	exit (1);	251	exit (EXIT_FAILURE);
		252	}
		253
		254	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		255	}
		256	#endif
		257
		258	#if ENABLE_DNS
		259	if (THISNODE->protocols & PROT_DNSv4)
		260	{
		261	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		262
		263	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		264
		265	if (dnsv4_fd < 0)
		266	return -1;
		267
		268	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		269	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		270
		271	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		272	// this I really consider a linux bug. I am neither connected
		273	// nor do I fragment myself. Linux still sets DF and doesn't
		274	// fragment for me sometimes.
		275	{
		276	int oval = IP_PMTUDISC_DONT;
		277	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
223	}	278	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#endif	279	# endif
		280
		281	// standard daemon practise...
		282	{
		283	int oval = 1;
		284	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		285	}
		286
		287	sockinfo si (THISNODE->dns_hostname,
		288	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		289	PROT_DNSv4);
		290
		291	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		292	{
		293	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		294	exit (EXIT_FAILURE);
		295	}
		296
		297	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
		298	}
		299	#endif
		300
		301	/////////////////////////////////////////////////////////////////////////////
		302
		303	reconnect_all ();
		304
		305	/////////////////////////////////////////////////////////////////////////////
228		306
229	tap = new tap_device ();	307	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	308	if (!tap) //D this, of course, never catches
231	{	309	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	310	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233	exit (1);	311	exit (EXIT_FAILURE);
234	}	312	}
235		313
		314	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
		315
		316	if (tap->if_up () &&
		317	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		318	{
		319	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		320	tap->if_up ());
		321	exit (EXIT_FAILURE);
		322	}
		323
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	324	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		325	{
		326	slog (L_ERR, _("if-up command execution failed, exiting."));
		327	exit (EXIT_FAILURE);
		328	}
237		329
238	tap_ev_watcher.start (tap->fd, POLLIN);	330	tap_ev_watcher.start (tap->fd, EVENT_READ);
239
240	reconnect_all ();
241		331
242	return 0;	332	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	}	333	}
272		334
273	bool	335	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	336	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	337	{
		338	#if defined(SOL_IP) && defined(IP_TOS)
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	339	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		340	#endif
277	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	341	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278		342
279	return true;	343	return true;
280	}	344	}
281		345
…		…
300	sum += (sum >> 16); // carry	364	sum += (sum >> 16); // carry
301		365
302	return ~sum;	366	return ~sum;
303	}	367	}
304		368
		369	#if ENABLE_ICMP
305	bool	370	bool
306	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	371	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307	{	372	{
		373	#if defined(SOL_IP) && defined(IP_TOS)
308	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	374	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		375	#endif
309		376
310	pkt->unshift_hdr (4);	377	pkt->unshift_hdr (4);
311		378
312	icmphdr hdr = (icmphdr )&((*pkt)[0]);	379	icmp_header hdr = (icmp_header )&((*pkt)[0]);
313	hdr->type = ::conf.icmp_type;	380	hdr->type = ::conf.icmp_type;
314	hdr->code = 255;	381	hdr->code = 255;
315	hdr->checksum = 0;	382	hdr->checksum = 0;
316	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	383	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317		384
318	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	385	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		386
320	return true;	387	return true;
321	}	388	}
		389	#endif
322		390
323	bool	391	bool
324	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	392	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
325	{	393	{
		394	#if defined(SOL_IP) && defined(IP_TOS)
326	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	395	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		396	#endif
327	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	397	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
328		398
329	return true;	399	return true;
		400	}
		401
		402	void
		403	vpn::inject_data_packet (tap_packet *pkt, int dst)
		404	{
		405	if (dst)
		406	{
		407	// unicast
		408	if (dst != THISNODE->id)
		409	conns[dst - 1]->inject_data_packet (pkt);
		410	}
		411	else
		412	{
		413	// broadcast, this is ugly, but due to the security policy
		414	// we have to connect to all hosts...
		415	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		416	if ((*c)->conf != THISNODE)
		417	(*c)->inject_data_packet (pkt, true);
		418	}
330	}	419	}
331		420
332	void	421	void
333	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	422	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
334	{	423	{
…		…
348	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	437	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349	else	438	else
350	{	439	{
351	connection *c = conns[src - 1];	440	connection *c = conns[src - 1];
352		441
353	if (dst == 0 && !THISNODE->routerprio)	442	if (dst == 0)
354	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	443	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355	c->conf->nodename, (const char *)rsi);	444	c->conf->nodename, (const char *)rsi);
356	else if (dst != 0 && dst != THISNODE->id)	445	else if (dst != THISNODE->id)
357	{	446	{
358	if (THISNODE->routerprio)	447	if (THISNODE->routerprio)
359	// the tos setting gets lost here. who cares.	448	// the tos setting gets lost here. who cares.
360	conns[dst - 1]->inject_vpn_packet (pkt);	449	conns[dst - 1]->inject_vpn_packet (pkt);
361	else	450	else
…		…
367	else	456	else
368	c->recv_vpn_packet (pkt, rsi);	457	c->recv_vpn_packet (pkt, rsi);
369	}	458	}
370	}	459	}
371		460
		461	bool
		462	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		463	{
		464	switch (si.prot)
		465	{
		466	case PROT_IPv4:
		467	return send_ipv4_packet (pkt, si, tos);
		468	case PROT_UDPv4:
		469	return send_udpv4_packet (pkt, si, tos);
		470	#if ENABLE_TCP
		471	case PROT_TCPv4:
		472	return send_tcpv4_packet (pkt, si, tos);
		473	#endif
		474	#if ENABLE_ICMP
		475	case PROT_ICMPv4:
		476	return send_icmpv4_packet (pkt, si, tos);
		477	#endif
		478	#if ENABLE_DNS
		479	case PROT_DNSv4:
		480	return send_dnsv4_packet (pkt, si, tos);
		481	#endif
		482
		483	default:
		484	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		485	}
		486
		487	return false;
		488	}
		489
372	void	490	void
373	vpn::ipv4_ev (io_watcher &w, short revents)	491	vpn::ipv4_ev (io_watcher &w, short revents)
374	{	492	{
375	if (revents & (POLLIN \| POLLERR))	493	if (revents & EVENT_READ)
376	{	494	{
377	vpn_packet *pkt = new vpn_packet;	495	vpn_packet *pkt = new vpn_packet;
378	struct sockaddr_in sa;	496	struct sockaddr_in sa;
379	socklen_t sa_len = sizeof (sa);	497	socklen_t sa_len = sizeof (sa);
380	int len;	498	int len;
…		…
385		503
386	if (len > 0)	504	if (len > 0)
387	{	505	{
388	pkt->len = len;	506	pkt->len = len;
389		507
390	// raw sockets deliver the ipv4, but don't expect it on sends	508	// raw sockets deliver the ipv4 header, but don't expect it on sends
391	// this is slow, but...
392	pkt->skip_hdr (IP_OVERHEAD);	509	pkt->skip_hdr (IP_OVERHEAD);
393		510
394	recv_vpn_packet (pkt, si);	511	recv_vpn_packet (pkt, si);
395	}	512	}
396	else	513	else
…		…
399	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	516	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
400	}	517	}
401		518
402	delete pkt;	519	delete pkt;
403	}	520	}
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	521	else
411	{	522	{
412	slog (L_ERR,	523	slog (L_ERR,
413	_("FATAL: unknown revents %08x in socket, terminating\n"),	524	_("FATAL: unknown revents %08x in socket, terminating\n"),
414	revents);	525	revents);
415	exit (1);	526	exit (EXIT_FAILURE);
416	}	527	}
417	}	528	}
418		529
		530	#if ENABLE_ICMP
419	void	531	void
420	vpn::icmpv4_ev (io_watcher &w, short revents)	532	vpn::icmpv4_ev (io_watcher &w, short revents)
421	{	533	{
422	if (revents & (POLLIN \| POLLERR))	534	if (revents & EVENT_READ)
423	{	535	{
424	vpn_packet *pkt = new vpn_packet;	536	vpn_packet *pkt = new vpn_packet;
425	struct sockaddr_in sa;	537	struct sockaddr_in sa;
426	socklen_t sa_len = sizeof (sa);	538	socklen_t sa_len = sizeof (sa);
427	int len;	539	int len;
…		…
432		544
433	if (len > 0)	545	if (len > 0)
434	{	546	{
435	pkt->len = len;	547	pkt->len = len;
436		548
437	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	549	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
438		550
439	if (hdr->type == ::conf.icmp_type	551	if (hdr->type == ::conf.icmp_type
440	&& hdr->code == 255)	552	&& hdr->code == 255)
441	{	553	{
442	// raw sockets deliver the ipv4, but don't expect it on sends	554	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
452	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	564	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
453	}	565	}
454		566
455	delete pkt;	567	delete pkt;
456	}	568	}
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	569	else
464	{	570	{
465	slog (L_ERR,	571	slog (L_ERR,
466	_("FATAL: unknown revents %08x in socket, terminating\n"),	572	_("FATAL: unknown revents %08x in socket, terminating\n"),
467	revents);	573	revents);
468	exit (1);	574	exit (EXIT_FAILURE);
469	}	575	}
470	}	576	}
		577	#endif
471		578
472	void	579	void
473	vpn::udpv4_ev (io_watcher &w, short revents)	580	vpn::udpv4_ev (io_watcher &w, short revents)
474	{	581	{
475	if (revents & (POLLIN \| POLLERR))	582	if (revents & EVENT_READ)
476	{	583	{
477	vpn_packet *pkt = new vpn_packet;	584	vpn_packet *pkt = new vpn_packet;
478	struct sockaddr_in sa;	585	struct sockaddr_in sa;
479	socklen_t sa_len = sizeof (sa);	586	socklen_t sa_len = sizeof (sa);
480	int len;	587	int len;
…		…
495	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	602	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
496	}	603	}
497		604
498	delete pkt;	605	delete pkt;
499	}	606	}
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	607	else
507	{	608	{
508	slog (L_ERR,	609	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	610	_("FATAL: unknown revents %08x in socket, terminating\n"),
510	revents);	611	revents);
511	exit (1);	612	exit (EXIT_FAILURE);
512	}	613	}
513	}	614	}
514		615
515	void	616	void
516	vpn::tap_ev (io_watcher &w, short revents)	617	vpn::tap_ev (io_watcher &w, short revents)
517	{	618	{
518	if (revents & POLLIN)	619	if (revents & EVENT_READ)
519	{	620	{
520	/* process data */	621	/* process data */
521	tap_packet *pkt;	622	tap_packet *pkt;
522		623
523	pkt = tap->recv ();	624	pkt = tap->recv ();
524		625
		626	if (!pkt)
		627	return;
		628
		629	if (pkt->len > 14)
		630	{
525	int dst = mac2id (pkt->dst);	631	int dst = mac2id (pkt->dst);
526	int src = mac2id (pkt->src);	632	int src = mac2id (pkt->src);
527		633
528	if (src != THISNODE->id)	634	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	{	635	{
546	// unicast	636	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
547	if (dst != THISNODE->id)	637	exit (EXIT_FAILURE);
548	conns[dst - 1]->inject_data_packet (pkt);
549	}	638	}
		639
		640	if (dst == THISNODE->id)
		641	{
		642	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		643	exit (EXIT_FAILURE);
		644	}
		645
		646	if (dst > conns.size ())
		647	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
550	else	648	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);	649	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	}	650	}
563		651
564	delete pkt;	652	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	}	653	}
571	else	654	else
572	abort ();	655	abort ();
573	}	656	}
574		657
…		…
580	if (events & EVENT_SHUTDOWN)	663	if (events & EVENT_SHUTDOWN)
581	{	664	{
582	slog (L_INFO, _("preparing shutdown..."));	665	slog (L_INFO, _("preparing shutdown..."));
583		666
584	shutdown_all ();	667	shutdown_all ();
585
586	remove_pid (pidfilename);	668	remove_pid (conf.pidfilename);
587
588	slog (L_INFO, _("terminating"));	669	slog (L_INFO, _("terminating"));
589		670	exit (EXIT_SUCCESS);
590	exit (0);
591	}	671	}
592		672
593	if (events & EVENT_RECONNECT)	673	if (events & EVENT_RECONNECT)
594	{	674	{
595	slog (L_INFO, _("forced reconnect"));	675	slog (L_INFO, _("forced reconnect"));
…		…
597	reconnect_all ();	677	reconnect_all ();
598	}	678	}
599		679
600	events = 0;	680	events = 0;
601	}	681	}
602
603	w.at = TSTAMP_CANCEL;
604	}	682	}
605		683
606	void	684	void
607	vpn::shutdown_all ()	685	vpn::shutdown_all ()
608	{	686	{
…		…
621	connection_init ();	699	connection_init ();
622		700
623	for (configuration::node_vector::iterator i = conf.nodes.begin ();	701	for (configuration::node_vector::iterator i = conf.nodes.begin ();
624	i != conf.nodes.end (); ++i)	702	i != conf.nodes.end (); ++i)
625	{	703	{
626	connection *conn = new connection (this);	704	connection conn = new connection (this, i);
627
628	conn->conf = *i;
629	conns.push_back (conn);	705	conns.push_back (conn);
630
631	conn->establish_connection ();	706	conn->establish_connection ();
632	}	707	}
633	}	708	}
634		709
635	connection *vpn::find_router ()	710	connection *vpn::find_router ()
636	{	711	{
637	u32 prio = 0;	712	u32 prio = 1;
638	connection *router = 0;	713	connection *router = 0;
639		714
640	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	715	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641	{	716	{
642	connection c = i;	717	connection c = i;
643		718
644	if (c->conf->routerprio > prio	719	if (c->conf->routerprio > prio
645	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	720	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646	&& c->ictx && c->octx	721	&& c->ictx && c->octx
647	&& c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode	722	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648	&& (!THISNODE->routerprio
649	\|\| c->conf->routerprio <= THISNODE->routerprio))
650	{	723	{
651	prio = c->conf->routerprio;	724	prio = c->conf->routerprio;
652	router = c;	725	router = c;
653	}	726	}
654	}	727	}
…		…
663	if (c)	736	if (c)
664	c->send_connect_request (id);	737	c->send_connect_request (id);
665	else	738	else
666	// no router found, aggressively connect to all routers	739	// no router found, aggressively connect to all routers
667	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	740	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668	if ((*i)->conf->routerprio)	741	if ((i)->conf->routerprio && (i)->conf != THISNODE)
669	(*i)->establish_connection ();	742	(*i)->establish_connection ();
670	}	743	}
671		744
672	void	745	void
673	connection::dump_status ()	746	connection::dump_status ()
…		…
700	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	773	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
701	#endif	774	#endif
702	#if ENABLE_ICMP	775	#if ENABLE_ICMP
703	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	776	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
704	#endif	777	#endif
		778	#if ENABLE_DNS
		779	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		780	#endif
705	, tap_ev_watcher (this, &vpn::tap_ev)	781	, tap_ev_watcher (this, &vpn::tap_ev)
706	{	782	{
707	}	783	}
708		784
709	vpn::~vpn ()	785	vpn::~vpn ()

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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 1.38 by pcg, Tue Apr 26 00:55:56 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.11 by pcg, Sun Apr 13 00:35:46 2003 UTC vs.
Revision 1.38 by pcg, Tue Apr 26 00:55:56 2005 UTC