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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.28 by pcg, Thu Mar 3 16:54:34 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/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"
		46
		47	vpn network; // THE vpn (bad design...)
43		48
44	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
45		50
46	const char *vpn::script_if_up ()	51	const char *vpn::script_if_up ()
47	{	52	{
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		59
55	char *env;	60	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57	putenv (env);
58	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
59	putenv (env);
60	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
61	putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
69	putenv (env);	71	putenv (env);
70		72
…		…
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		84
83	if (ipv4_fd < 0)	85	if (ipv4_fd < 0)
84	return -1;	86	return -1;
85		87
86	#ifdef IP_MTU_DISCOVER	88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		89
		90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	91	// this I really consider a linux bug. I am neither connected
88	// nor do I fragment myself. Linux still sets DF and doesn't	92	// nor do I fragment myself. Linux still sets DF and doesn't
89	// fragment for me sometimes.	93	// fragment for me sometimes.
90	{	94	{
91	int oval = IP_PMTUDISC_DONT;	95	int oval = IP_PMTUDISC_DONT;
…		…
96	sockinfo si (THISNODE, PROT_IPv4);	100	sockinfo si (THISNODE, PROT_IPv4);
97		101
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	103	{
100	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
101	exit (1);	105	exit (EXIT_FAILURE);
102	}	106	}
103		107
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
105	}	109	}
106		110
107	udpv4_fd = -1;	111	udpv4_fd = -1;
108		112
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	114	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		116
113	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
114	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
115		121
116	// standard daemon practise...	122	// standard daemon practise...
117	{	123	{
118	int oval = 1;	124	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	126	}
121		127
122	#ifdef IP_MTU_DISCOVER	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
124	// nor do I fragment myself. Linux still sets DF and doesn't	130	// nor do I fragment myself. Linux still sets DF and doesn't
125	// fragment for me sometimes.	131	// fragment for me sometimes.
126	{	132	{
127	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
…		…
132	sockinfo si (THISNODE, PROT_UDPv4);	138	sockinfo si (THISNODE, PROT_UDPv4);
133		139
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	141	{
136	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
137	exit (1);	143	exit (EXIT_FAILURE);
138	}	144	}
139		145
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
141	}	147	}
142		148
143	icmpv4_fd = -1;	149	icmpv4_fd = -1;
144		150
145	#if ENABLE_ICMP	151	#if ENABLE_ICMP
…		…
147	{	153	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		155
150	if (icmpv4_fd < 0)	156	if (icmpv4_fd < 0)
151	return -1;	157	return -1;
		158
		159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
152		160
153	#ifdef ICMP_FILTER	161	#ifdef ICMP_FILTER
154	{	162	{
155	icmp_filter oval;	163	icmp_filter oval;
156	oval.data = 0xffffffff;	164	oval.data = 0xffffffff;
…		…
159		167
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	169	}
162	#endif	170	#endif
163		171
164	#ifdef IP_MTU_DISCOVER	172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	173	// this I really consider a linux bug. I am neither connected
166	// nor do I fragment myself. Linux still sets DF and doesn't	174	// nor do I fragment myself. Linux still sets DF and doesn't
167	// fragment for me sometimes.	175	// fragment for me sometimes.
168	{	176	{
169	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
…		…
174	sockinfo si (THISNODE, PROT_ICMPv4);	182	sockinfo si (THISNODE, PROT_ICMPv4);
175		183
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	185	{
178	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
179	exit (1);	187	exit (EXIT_FAILURE);
180	}	188	}
181		189
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
183	}	191	}
184	#endif	192	#endif
185		193
186	tcpv4_fd = -1;	194	tcpv4_fd = -1;
187		195
…		…
190	{	198	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		200
193	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
194	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
195		205
196	// standard daemon practise...	206	// standard daemon practise...
197	{	207	{
198	int oval = 1;	208	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
202	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
203		213
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	215	{
206	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
207	exit (1);	217	exit (EXIT_FAILURE);
208	}	218	}
209		219
210	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
211	{	221	{
212	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
213	exit (1);	223	exit (EXIT_FAILURE);
		224	}
		225
		226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		227	}
		228	#endif
		229
		230	#if ENABLE_DNS
		231	if (THISNODE->protocols & PROT_DNSv4)
		232	{
		233	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		234
		235	if (dnsv4_fd < 0)
		236	return -1;
		237
		238	// standard daemon practise...
		239	{
		240	int oval = 1;
		241	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		242	}
		243
		244	sockinfo si (THISNODE, PROT_DNSv4);
		245
		246	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
214	}	247	{
		248	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		249	exit (EXIT_FAILURE);
		250	}
215		251
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	252	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
217	}	253	}
218	#endif	254	#endif
219		255
220	tap = new tap_device ();	256	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	257	if (!tap) //D this, of course, never catches
222	{	258	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	259	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
224	exit (1);	260	exit (EXIT_FAILURE);
225	}	261	}
226		262
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	263	run_script (run_script_cb (this, &vpn::script_if_up), true);
228		264
229	tap_ev_watcher.start (tap->fd, POLLIN);	265	tap_ev_watcher.start (tap->fd, EVENT_READ);
230		266
231	reconnect_all ();	267	reconnect_all ();
232		268
233	return 0;	269	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	}	270	}
263		271
264	bool	272	bool
265	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	273	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
266	{	274	{
		275	#if defined(SOL_IP) && defined(IP_TOS)
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		277	#endif
268	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	278	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
269		279
270	return true;	280	return true;
271	}	281	}
272		282
…		…
291	sum += (sum >> 16); // carry	301	sum += (sum >> 16); // carry
292		302
293	return ~sum;	303	return ~sum;
294	}	304	}
295		305
		306	#if ENABLE_ICMP
296	bool	307	bool
297	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	308	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
298	{	309	{
		310	#if defined(SOL_IP) && defined(IP_TOS)
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	311	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		312	#endif
300		313
301	pkt->unshift_hdr (4);	314	pkt->unshift_hdr (4);
302		315
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	316	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	317	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	318	hdr->code = 255;
306	hdr->checksum = 0;	319	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		321
309	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	322	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
310		323
311	return true;	324	return true;
312	}	325	}
		326	#endif
313		327
314	bool	328	bool
315	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	329	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
316	{	330	{
		331	#if defined(SOL_IP) && defined(IP_TOS)
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	332	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		333	#endif
318	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	334	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		335
320	return true;	336	return true;
		337	}
		338
		339	void
		340	vpn::inject_data_packet (tap_packet *pkt, int dst)
		341	{
		342	if (dst)
		343	{
		344	// unicast
		345	if (dst != THISNODE->id)
		346	conns[dst - 1]->inject_data_packet (pkt);
		347	}
		348	else
		349	{
		350	// broadcast, this is ugly, but due to the security policy
		351	// we have to connect to all hosts...
		352	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		353	if ((*c)->conf != THISNODE)
		354	(*c)->inject_data_packet (pkt, true);
		355	}
321	}	356	}
322		357
323	void	358	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	359	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	360	{
…		…
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	375	else
341	{	376	{
342	connection *c = conns[src - 1];	377	connection *c = conns[src - 1];
343		378
344	if (dst == 0 && !THISNODE->routerprio)	379	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	380	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346	c->conf->nodename, (const char *)rsi);	381	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	382	else if (dst != THISNODE->id)
348	{	383	{
349	if (THISNODE->routerprio)	384	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	385	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	386	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	387	else
…		…
361	}	396	}
362		397
363	void	398	void
364	vpn::ipv4_ev (io_watcher &w, short revents)	399	vpn::ipv4_ev (io_watcher &w, short revents)
365	{	400	{
366	if (revents & (POLLIN \| POLLERR))	401	if (revents & EVENT_READ)
367	{	402	{
368	vpn_packet *pkt = new vpn_packet;	403	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	404	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	405	socklen_t sa_len = sizeof (sa);
371	int len;	406	int len;
…		…
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	425	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
391	}	426	}
392		427
393	delete pkt;	428	delete pkt;
394	}	429	}
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	430	else
402	{	431	{
403	slog (L_ERR,	432	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	433	_("FATAL: unknown revents %08x in socket, terminating\n"),
405	revents);	434	revents);
406	exit (1);	435	exit (EXIT_FAILURE);
407	}	436	}
408	}	437	}
409		438
		439	#if ENABLE_ICMP
410	void	440	void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	441	vpn::icmpv4_ev (io_watcher &w, short revents)
412	{	442	{
413	if (revents & (POLLIN \| POLLERR))	443	if (revents & EVENT_READ)
414	{	444	{
415	vpn_packet *pkt = new vpn_packet;	445	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	446	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	447	socklen_t sa_len = sizeof (sa);
418	int len;	448	int len;
…		…
423		453
424	if (len > 0)	454	if (len > 0)
425	{	455	{
426	pkt->len = len;	456	pkt->len = len;
427		457
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	458	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		459
430	if (hdr->type == ::conf.icmp_type	460	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	461	&& hdr->code == 255)
432	{	462	{
433	// raw sockets deliver the ipv4, but don't expect it on sends	463	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	473	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
444	}	474	}
445		475
446	delete pkt;	476	delete pkt;
447	}	477	}
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	478	else
455	{	479	{
456	slog (L_ERR,	480	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	481	_("FATAL: unknown revents %08x in socket, terminating\n"),
458	revents);	482	revents);
459	exit (1);	483	exit (EXIT_FAILURE);
460	}	484	}
461	}	485	}
		486	#endif
462		487
463	void	488	void
464	vpn::udpv4_ev (io_watcher &w, short revents)	489	vpn::udpv4_ev (io_watcher &w, short revents)
465	{	490	{
466	if (revents & (POLLIN \| POLLERR))	491	if (revents & EVENT_READ)
467	{	492	{
468	vpn_packet *pkt = new vpn_packet;	493	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	494	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	495	socklen_t sa_len = sizeof (sa);
471	int len;	496	int len;
…		…
486	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	511	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
487	}	512	}
488		513
489	delete pkt;	514	delete pkt;
490	}	515	}
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	516	else
498	{	517	{
499	slog (L_ERR,	518	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	519	_("FATAL: unknown revents %08x in socket, terminating\n"),
501	revents);	520	revents);
502	exit (1);	521	exit (EXIT_FAILURE);
503	}	522	}
504	}	523	}
505		524
506	void	525	void
507	vpn::tap_ev (io_watcher &w, short revents)	526	vpn::tap_ev (io_watcher &w, short revents)
508	{	527	{
509	if (revents & POLLIN)	528	if (revents & EVENT_READ)
510	{	529	{
511	/* process data */	530	/* process data */
512	tap_packet *pkt;	531	tap_packet *pkt;
513		532
514	pkt = tap->recv ();	533	pkt = tap->recv ();
515		534
		535	if (!pkt)
		536	return;
		537
		538	if (pkt->len > 14)
		539	{
516	int dst = mac2id (pkt->dst);	540	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	541	int src = mac2id (pkt->src);
518		542
519	if (src != THISNODE->id)	543	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	{	544	{
537	// unicast	545	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
538	if (dst != THISNODE->id)	546	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	547	}
		548
		549	if (dst == THISNODE->id)
		550	{
		551	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		552	exit (EXIT_FAILURE);
		553	}
		554
		555	if (dst > conns.size ())
		556	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
541	else	557	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);	558	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	}	559	}
554		560
555	delete pkt;	561	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	}	562	}
562	else	563	else
563	abort ();	564	abort ();
564	}	565	}
565		566
…		…
571	if (events & EVENT_SHUTDOWN)	572	if (events & EVENT_SHUTDOWN)
572	{	573	{
573	slog (L_INFO, _("preparing shutdown..."));	574	slog (L_INFO, _("preparing shutdown..."));
574		575
575	shutdown_all ();	576	shutdown_all ();
576
577	remove_pid (pidfilename);	577	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	578	slog (L_INFO, _("terminating"));
580		579	exit (EXIT_SUCCESS);
581	exit (0);
582	}	580	}
583		581
584	if (events & EVENT_RECONNECT)	582	if (events & EVENT_RECONNECT)
585	{	583	{
586	slog (L_INFO, _("forced reconnect"));	584	slog (L_INFO, _("forced reconnect"));
…		…
588	reconnect_all ();	586	reconnect_all ();
589	}	587	}
590		588
591	events = 0;	589	events = 0;
592	}	590	}
593
594	w.at = TSTAMP_CANCEL;
595	}	591	}
596		592
597	void	593	void
598	vpn::shutdown_all ()	594	vpn::shutdown_all ()
599	{	595	{
…		…
612	connection_init ();	608	connection_init ();
613		609
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	610	for (configuration::node_vector::iterator i = conf.nodes.begin ();
615	i != conf.nodes.end (); ++i)	611	i != conf.nodes.end (); ++i)
616	{	612	{
617	connection *conn = new connection (this);	613	connection conn = new connection (this, i);
618
619	conn->conf = *i;
620	conns.push_back (conn);	614	conns.push_back (conn);
621
622	conn->establish_connection ();	615	conn->establish_connection ();
623	}	616	}
624	}	617	}
625		618
626	connection *vpn::find_router ()	619	connection *vpn::find_router ()
627	{	620	{
628	u32 prio = 0;	621	u32 prio = 1;
629	connection *router = 0;	622	connection *router = 0;
630		623
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	624	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	625	{
633	connection c = i;	626	connection c = i;
634		627
635	if (c->conf->routerprio > prio	628	if (c->conf->routerprio > prio
636	&& c->connectmode == conf_node::C_ALWAYS	629	&& 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)	630	&& c->ictx && c->octx
		631	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639	{	632	{
640	prio = c->conf->routerprio;	633	prio = c->conf->routerprio;
641	router = c;	634	router = c;
642	}	635	}
643	}	636	}
…		…
652	if (c)	645	if (c)
653	c->send_connect_request (id);	646	c->send_connect_request (id);
654	else	647	else
655	// no router found, aggressively connect to all routers	648	// no router found, aggressively connect to all routers
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	649	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	if ((*i)->conf->routerprio)	650	if ((i)->conf->routerprio && (i)->conf != THISNODE)
658	(*i)->establish_connection ();	651	(*i)->establish_connection ();
659	}	652	}
660		653
661	void	654	void
662	connection::dump_status ()	655	connection::dump_status ()
…		…
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	682	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
690	#endif	683	#endif
691	#if ENABLE_ICMP	684	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	685	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
693	#endif	686	#endif
		687	#if ENABLE_DNS
		688	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		689	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	690	, tap_ev_watcher (this, &vpn::tap_ev)
695	{	691	{
696	}	692	}
697		693
698	vpn::~vpn ()	694	vpn::~vpn ()

Diff Legend

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

Comparing gvpe/src/vpn.C (file contents): Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs. Revision 1.28 by pcg, Thu Mar 3 16:54:34 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.28 by pcg, Thu Mar 3 16:54:34 2005 UTC