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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs.
Revision 1.36 by pcg, Fri Apr 8 16:48:16 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 <arpa/inet.h>	36	#include <fcntl.h>
35	#include <netinet/in.h>	37	#include <sys/socket.h>
36	#include <netinet/ip_icmp.h>	38
		39	#include "netcompat.h"
37		40
38	#include "pidfile.h"	41	#include "pidfile.h"
39		42
40	#include "connection.h"	43	#include "connection.h"
41	#include "util.h"	44	#include "util.h"
42	#include "vpn.h"	45	#include "vpn.h"
43		46
		47	vpn network; // THE vpn (bad design...)
		48
44	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
45		50
46	const char *vpn::script_if_up ()	51	void
		52	vpn::script_init_env ()
47	{	53	{
48	// the tunnel device mtu should be the physical mtu - overhead	54	// the tunnel device mtu should be the physical mtu - overhead
49	// the tricky part is rounding to the cipher key blocksize	55	// the tricky part is rounding to the cipher key blocksize
50	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		60
55	char *env;	61	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	62	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57	putenv (env);
58	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
59	putenv (env);
60	asprintf (&env, "NODEID=%d", THISNODE->id);
61	putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ());	63	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	64	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		65	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	66	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);	67	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68	THISNODE->id & 0xff);
69	putenv (env);
70		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,
71	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;
72	}	98	}
73		99
74	int	100	int
75	vpn::setup ()	101	vpn::setup ()
76	{	102	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	107	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		108
83	if (ipv4_fd < 0)	109	if (ipv4_fd < 0)
84	return -1;	110	return -1;
85		111
86	#ifdef IP_MTU_DISCOVER	112	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		113
		114	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	115	// this I really consider a linux bug. I am neither connected
88	// 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
89	// fragment for me sometimes.	117	// fragment for me sometimes.
90	{	118	{
91	int oval = IP_PMTUDISC_DONT;	119	int oval = IP_PMTUDISC_DONT;
…		…
96	sockinfo si (THISNODE, PROT_IPv4);	124	sockinfo si (THISNODE, PROT_IPv4);
97		125
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	126	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	127	{
100	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));
101	exit (1);	129	exit (EXIT_FAILURE);
102	}	130	}
103		131
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	132	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
105	}	133	}
106		134
107	udpv4_fd = -1;	135	udpv4_fd = -1;
108		136
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	137	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	138	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	139	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		140
113	if (udpv4_fd < 0)	141	if (udpv4_fd < 0)
114	return -1;	142	return -1;
		143
		144	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
115		145
116	// standard daemon practise...	146	// standard daemon practise...
117	{	147	{
118	int oval = 1;	148	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	149	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	150	}
121		151
122	#ifdef IP_MTU_DISCOVER	152	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	153	// this I really consider a linux bug. I am neither connected
124	// 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
125	// fragment for me sometimes.	155	// fragment for me sometimes.
126	{	156	{
127	int oval = IP_PMTUDISC_DONT;	157	int oval = IP_PMTUDISC_DONT;
…		…
132	sockinfo si (THISNODE, PROT_UDPv4);	162	sockinfo si (THISNODE, PROT_UDPv4);
133		163
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	164	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	165	{
136	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));
137	exit (1);	167	exit (EXIT_FAILURE);
138	}	168	}
139		169
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	170	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
141	}	171	}
142		172
143	icmpv4_fd = -1;	173	icmpv4_fd = -1;
144		174
145	#if ENABLE_ICMP	175	#if ENABLE_ICMP
…		…
147	{	177	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	178	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		179
150	if (icmpv4_fd < 0)	180	if (icmpv4_fd < 0)
151	return -1;	181	return -1;
		182
		183	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
152		184
153	#ifdef ICMP_FILTER	185	#ifdef ICMP_FILTER
154	{	186	{
155	icmp_filter oval;	187	icmp_filter oval;
156	oval.data = 0xffffffff;	188	oval.data = 0xffffffff;
…		…
159		191
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	192	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	193	}
162	#endif	194	#endif
163		195
164	#ifdef IP_MTU_DISCOVER	196	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	197	// this I really consider a linux bug. I am neither connected
166	// 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
167	// fragment for me sometimes.	199	// fragment for me sometimes.
168	{	200	{
169	int oval = IP_PMTUDISC_DONT;	201	int oval = IP_PMTUDISC_DONT;
170	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	202	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171	}	203	}
172	#endif	204	#endif
173		205
174	sockinfo si (THISNODE, PROT_ICMPv4);	206	sockinfo si (THISNODE, PROT_ICMPv4);
175		207
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	208	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	209	{
178	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));
179	exit (1);	211	exit (EXIT_FAILURE);
180	}	212	}
181		213
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	214	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
183	}	215	}
184	#endif	216	#endif
185		217
186	tcpv4_fd = -1;	218	tcpv4_fd = -1;
187		219
…		…
190	{	222	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	223	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		224
193	if (tcpv4_fd < 0)	225	if (tcpv4_fd < 0)
194	return -1;	226	return -1;
		227
		228	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
195		229
196	// standard daemon practise...	230	// standard daemon practise...
197	{	231	{
198	int oval = 1;	232	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	233	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
202	sockinfo si (THISNODE, PROT_TCPv4);	236	sockinfo si (THISNODE, PROT_TCPv4);
203		237
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	239	{
206	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));
207	exit (1);	241	exit (EXIT_FAILURE);
208	}	242	}
209		243
210	if (listen (tcpv4_fd, 5))	244	if (listen (tcpv4_fd, 5))
211	{	245	{
212	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));
213	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 (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
214	}	271	}
215
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
217	}
218	#endif	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 ()))
		285	{
		286	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		287	exit (EXIT_FAILURE);
		288	}
		289
		290	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
		291	}
		292	#endif
		293
		294	/////////////////////////////////////////////////////////////////////////////
		295
		296	reconnect_all ();
		297
		298	/////////////////////////////////////////////////////////////////////////////
219		299
220	tap = new tap_device ();	300	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	301	if (!tap) //D this, of course, never catches
222	{	302	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	303	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
224	exit (1);	304	exit (EXIT_FAILURE);
225	}	305	}
226		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
227	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	}
228		320
229	tap_ev_watcher.start (tap->fd, POLLIN);	321	tap_ev_watcher.start (tap->fd, EVENT_READ);
230
231	reconnect_all ();
232		322
233	return 0;	323	return 0;
234	}
235
236	// send a vpn packet out to other hosts
237	bool
238	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
239	{
240	switch (si.prot)
241	{
242	case PROT_IPv4:
243	return send_ipv4_packet (pkt, si, tos);
244
245	case PROT_UDPv4:
246	return send_udpv4_packet (pkt, si, tos);
247
248	#if ENABLE_TCP
249	case PROT_TCPv4:
250	return send_tcpv4_packet (pkt, si, tos);
251	#endif
252
253	#if ENABLE_ICMP
254	case PROT_ICMPv4:
255	return send_icmpv4_packet (pkt, si, tos);
256	#endif
257
258	default:
259	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
260	return false;
261	}
262	}	324	}
263		325
264	bool	326	bool
265	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)
266	{	328	{
		329	#if defined(SOL_IP) && defined(IP_TOS)
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	330	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		331	#endif
268	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 ());
269		333
270	return true;	334	return true;
271	}	335	}
272		336
…		…
291	sum += (sum >> 16); // carry	355	sum += (sum >> 16); // carry
292		356
293	return ~sum;	357	return ~sum;
294	}	358	}
295		359
		360	#if ENABLE_ICMP
296	bool	361	bool
297	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)
298	{	363	{
		364	#if defined(SOL_IP) && defined(IP_TOS)
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	365	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		366	#endif
300		367
301	pkt->unshift_hdr (4);	368	pkt->unshift_hdr (4);
302		369
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	370	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	371	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	372	hdr->code = 255;
306	hdr->checksum = 0;	373	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	374	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		375
309	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 ());
310		377
311	return true;	378	return true;
312	}	379	}
		380	#endif
313		381
314	bool	382	bool
315	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)
316	{	384	{
		385	#if defined(SOL_IP) && defined(IP_TOS)
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	386	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		387	#endif
318	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 ());
319		389
320	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	}
321	}	410	}
322		411
323	void	412	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	413	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	414	{
…		…
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	428	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	429	else
341	{	430	{
342	connection *c = conns[src - 1];	431	connection *c = conns[src - 1];
343		432
344	if (dst == 0 && !THISNODE->routerprio)	433	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	434	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346	c->conf->nodename, (const char *)rsi);	435	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	436	else if (dst != THISNODE->id)
348	{	437	{
349	if (THISNODE->routerprio)	438	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	439	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	440	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	441	else
…		…
358	else	447	else
359	c->recv_vpn_packet (pkt, rsi);	448	c->recv_vpn_packet (pkt, rsi);
360	}	449	}
361	}	450	}
362		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
363	void	481	void
364	vpn::ipv4_ev (io_watcher &w, short revents)	482	vpn::ipv4_ev (io_watcher &w, short revents)
365	{	483	{
366	if (revents & (POLLIN \| POLLERR))	484	if (revents & EVENT_READ)
367	{	485	{
368	vpn_packet *pkt = new vpn_packet;	486	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	487	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	488	socklen_t sa_len = sizeof (sa);
371	int len;	489	int len;
…		…
376		494
377	if (len > 0)	495	if (len > 0)
378	{	496	{
379	pkt->len = len;	497	pkt->len = len;
380		498
381	// 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
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	500	pkt->skip_hdr (IP_OVERHEAD);
384		501
385	recv_vpn_packet (pkt, si);	502	recv_vpn_packet (pkt, si);
386	}	503	}
387	else	504	else
…		…
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	507	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
391	}	508	}
392		509
393	delete pkt;	510	delete pkt;
394	}	511	}
395	else if (revents & POLLHUP)
396	{
397	// this cannot ;) happen on udp sockets
398	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
399	exit (1);
400	}
401	else	512	else
402	{	513	{
403	slog (L_ERR,	514	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	515	_("FATAL: unknown revents %08x in socket, terminating\n"),
405	revents);	516	revents);
406	exit (1);	517	exit (EXIT_FAILURE);
407	}	518	}
408	}	519	}
409		520
		521	#if ENABLE_ICMP
410	void	522	void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	523	vpn::icmpv4_ev (io_watcher &w, short revents)
412	{	524	{
413	if (revents & (POLLIN \| POLLERR))	525	if (revents & EVENT_READ)
414	{	526	{
415	vpn_packet *pkt = new vpn_packet;	527	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	528	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	529	socklen_t sa_len = sizeof (sa);
418	int len;	530	int len;
…		…
423		535
424	if (len > 0)	536	if (len > 0)
425	{	537	{
426	pkt->len = len;	538	pkt->len = len;
427		539
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	540	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		541
430	if (hdr->type == ::conf.icmp_type	542	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	543	&& hdr->code == 255)
432	{	544	{
433	// 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
…		…
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	555	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
444	}	556	}
445		557
446	delete pkt;	558	delete pkt;
447	}	559	}
448	else if (revents & POLLHUP)
449	{
450	// this cannot ;) happen on udp sockets
451	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
452	exit (1);
453	}
454	else	560	else
455	{	561	{
456	slog (L_ERR,	562	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	563	_("FATAL: unknown revents %08x in socket, terminating\n"),
458	revents);	564	revents);
459	exit (1);	565	exit (EXIT_FAILURE);
460	}	566	}
461	}	567	}
		568	#endif
462		569
463	void	570	void
464	vpn::udpv4_ev (io_watcher &w, short revents)	571	vpn::udpv4_ev (io_watcher &w, short revents)
465	{	572	{
466	if (revents & (POLLIN \| POLLERR))	573	if (revents & EVENT_READ)
467	{	574	{
468	vpn_packet *pkt = new vpn_packet;	575	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	576	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	577	socklen_t sa_len = sizeof (sa);
471	int len;	578	int len;
…		…
486	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));
487	}	594	}
488		595
489	delete pkt;	596	delete pkt;
490	}	597	}
491	else if (revents & POLLHUP)
492	{
493	// this cannot ;) happen on udp sockets
494	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
495	exit (1);
496	}
497	else	598	else
498	{	599	{
499	slog (L_ERR,	600	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	601	_("FATAL: unknown revents %08x in socket, terminating\n"),
501	revents);	602	revents);
502	exit (1);	603	exit (EXIT_FAILURE);
503	}	604	}
504	}	605	}
505		606
506	void	607	void
507	vpn::tap_ev (io_watcher &w, short revents)	608	vpn::tap_ev (io_watcher &w, short revents)
508	{	609	{
509	if (revents & POLLIN)	610	if (revents & EVENT_READ)
510	{	611	{
511	/* process data */	612	/* process data */
512	tap_packet *pkt;	613	tap_packet *pkt;
513		614
514	pkt = tap->recv ();	615	pkt = tap->recv ();
515		616
		617	if (!pkt)
		618	return;
		619
		620	if (pkt->len > 14)
		621	{
516	int dst = mac2id (pkt->dst);	622	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	623	int src = mac2id (pkt->src);
518		624
519	if (src != THISNODE->id)	625	if (src != THISNODE->id)
520	{
521	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
522	exit (1);
523	}
524
525	if (dst == THISNODE->id)
526	{
527	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
528	exit (1);
529	}
530
531	if (dst > conns.size ())
532	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
533	else
534	{
535	if (dst)
536	{	626	{
537	// unicast	627	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	628	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	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);
541	else	639	else
542	{
543	// broadcast, first check router, then self, then english
544	connection *router = find_router ();
545
546	if (router)
547	router->inject_data_packet (pkt, true);	640	inject_data_packet (pkt, dst);
548	else
549	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
550	if ((*c)->conf != THISNODE)
551	(*c)->inject_data_packet (pkt);
552	}
553	}	641	}
554		642
555	delete pkt;	643	delete pkt;
556	}
557	else if (revents & (POLLHUP \| POLLERR))
558	{
559	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
560	exit (1);
561	}	644	}
562	else	645	else
563	abort ();	646	abort ();
564	}	647	}
565		648
…		…
571	if (events & EVENT_SHUTDOWN)	654	if (events & EVENT_SHUTDOWN)
572	{	655	{
573	slog (L_INFO, _("preparing shutdown..."));	656	slog (L_INFO, _("preparing shutdown..."));
574		657
575	shutdown_all ();	658	shutdown_all ();
576
577	remove_pid (pidfilename);	659	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	660	slog (L_INFO, _("terminating"));
580		661	exit (EXIT_SUCCESS);
581	exit (0);
582	}	662	}
583		663
584	if (events & EVENT_RECONNECT)	664	if (events & EVENT_RECONNECT)
585	{	665	{
586	slog (L_INFO, _("forced reconnect"));	666	slog (L_INFO, _("forced reconnect"));
…		…
588	reconnect_all ();	668	reconnect_all ();
589	}	669	}
590		670
591	events = 0;	671	events = 0;
592	}	672	}
593
594	w.at = TSTAMP_CANCEL;
595	}	673	}
596		674
597	void	675	void
598	vpn::shutdown_all ()	676	vpn::shutdown_all ()
599	{	677	{
…		…
612	connection_init ();	690	connection_init ();
613		691
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	692	for (configuration::node_vector::iterator i = conf.nodes.begin ();
615	i != conf.nodes.end (); ++i)	693	i != conf.nodes.end (); ++i)
616	{	694	{
617	connection *conn = new connection (this);	695	connection conn = new connection (this, i);
618
619	conn->conf = *i;
620	conns.push_back (conn);	696	conns.push_back (conn);
621
622	conn->establish_connection ();	697	conn->establish_connection ();
623	}	698	}
624	}	699	}
625		700
626	connection *vpn::find_router ()	701	connection *vpn::find_router ()
627	{	702	{
628	u32 prio = 0;	703	u32 prio = 1;
629	connection *router = 0;	704	connection *router = 0;
630		705
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	706	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	707	{
633	connection c = i;	708	connection c = i;
634		709
635	if (c->conf->routerprio > prio	710	if (c->conf->routerprio > prio
636	&& c->connectmode == conf_node::C_ALWAYS	711	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
637	&& c->conf != THISNODE
638	&& c->ictx && c->octx)	712	&& c->ictx && c->octx
		713	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639	{	714	{
640	prio = c->conf->routerprio;	715	prio = c->conf->routerprio;
641	router = c;	716	router = c;
642	}	717	}
643	}	718	}
…		…
652	if (c)	727	if (c)
653	c->send_connect_request (id);	728	c->send_connect_request (id);
654	else	729	else
655	// no router found, aggressively connect to all routers	730	// no router found, aggressively connect to all routers
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	if ((*i)->conf->routerprio)	732	if ((i)->conf->routerprio && (i)->conf != THISNODE)
658	(*i)->establish_connection ();	733	(*i)->establish_connection ();
659	}	734	}
660		735
661	void	736	void
662	connection::dump_status ()	737	connection::dump_status ()
…		…
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	764	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
690	#endif	765	#endif
691	#if ENABLE_ICMP	766	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	767	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
693	#endif	768	#endif
		769	#if ENABLE_DNS
		770	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		771	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	772	, tap_ev_watcher (this, &vpn::tap_ev)
695	{	773	{
696	}	774	}
697		775
698	vpn::~vpn ()	776	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs. Revision 1.36 by pcg, Fri Apr 8 16:48:16 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs.
Revision 1.36 by pcg, Fri Apr 8 16:48:16 2005 UTC