[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 1.33 by pcg, Wed Mar 23 21:55:39 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);	63	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
60	putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id);	64	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62	putenv (env);
63	asprintf (&env, "IFNAME=%s", tap->interface ());	65	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64	putenv (env);	66	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		67	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu);	68	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	putenv (env);
67	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
68	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69	THISNODE->id & 0xff);	71	THISNODE->id & 0xff); putenv (env);
70	putenv (env);
71		72
		73	// TODO: info for other nodes, maybe?
		74	}
		75
		76	const char *vpn::script_if_init ()
		77	{
		78	script_init_env ();
		79
		80	return tap->if_up ();
		81	}
		82
		83	const char *vpn::script_if_up ()
		84	{
		85	script_init_env ();
		86
		87	char *filename;
		88	asprintf (&filename,
		89	"%s/%s",
		90	confbase,
72	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	91	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		92
		93	return filename;
73	}	94	}
74		95
75	int	96	int
76	vpn::setup ()	97	vpn::setup ()
77	{	98	{
84	if (ipv4_fd < 0)	105	if (ipv4_fd < 0)
85	return -1;	106	return -1;
86		107
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	108	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88		109
89	#ifdef IP_MTU_DISCOVER	110	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	111	// this I really consider a linux bug. I am neither connected
91	// nor do I fragment myself. Linux still sets DF and doesn't	112	// nor do I fragment myself. Linux still sets DF and doesn't
92	// fragment for me sometimes.	113	// fragment for me sometimes.
93	{	114	{
94	int oval = IP_PMTUDISC_DONT;	115	int oval = IP_PMTUDISC_DONT;
…		…
99	sockinfo si (THISNODE, PROT_IPv4);	120	sockinfo si (THISNODE, PROT_IPv4);
100		121
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	123	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
104	exit (1);	125	exit (EXIT_FAILURE);
105	}	126	}
106		127
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	128	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
108	}	129	}
109		130
110	udpv4_fd = -1;	131	udpv4_fd = -1;
111		132
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	133	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
…		…
122	{	143	{
123	int oval = 1;	144	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	145	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125	}	146	}
126		147
127	#ifdef IP_MTU_DISCOVER	148	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128	// this I really consider a linux bug. I am neither connected	149	// this I really consider a linux bug. I am neither connected
129	// nor do I fragment myself. Linux still sets DF and doesn't	150	// nor do I fragment myself. Linux still sets DF and doesn't
130	// fragment for me sometimes.	151	// fragment for me sometimes.
131	{	152	{
132	int oval = IP_PMTUDISC_DONT;	153	int oval = IP_PMTUDISC_DONT;
…		…
137	sockinfo si (THISNODE, PROT_UDPv4);	158	sockinfo si (THISNODE, PROT_UDPv4);
138		159
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	160	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	161	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	162	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
142	exit (1);	163	exit (EXIT_FAILURE);
143	}	164	}
144		165
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	166	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
146	}	167	}
147		168
148	icmpv4_fd = -1;	169	icmpv4_fd = -1;
149		170
150	#if ENABLE_ICMP	171	#if ENABLE_ICMP
…		…
166		187
167	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	188	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168	}	189	}
169	#endif	190	#endif
170		191
171	#ifdef IP_MTU_DISCOVER	192	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172	// this I really consider a linux bug. I am neither connected	193	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	194	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	195	// fragment for me sometimes.
175	{	196	{
176	int oval = IP_PMTUDISC_DONT;	197	int oval = IP_PMTUDISC_DONT;
…		…
181	sockinfo si (THISNODE, PROT_ICMPv4);	202	sockinfo si (THISNODE, PROT_ICMPv4);
182		203
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	204	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	205	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	206	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
186	exit (1);	207	exit (EXIT_FAILURE);
187	}	208	}
188		209
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	210	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
190	}	211	}
191	#endif	212	#endif
192		213
193	tcpv4_fd = -1;	214	tcpv4_fd = -1;
194		215
…		…
211	sockinfo si (THISNODE, PROT_TCPv4);	232	sockinfo si (THISNODE, PROT_TCPv4);
212		233
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	234	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	235	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	236	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
216	exit (1);	237	exit (EXIT_FAILURE);
217	}	238	}
218		239
219	if (listen (tcpv4_fd, 5))	240	if (listen (tcpv4_fd, 5))
220	{	241	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	242	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
222	exit (1);	243	exit (EXIT_FAILURE);
		244	}
		245
		246	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		247	}
		248	#endif
		249
		250	#if ENABLE_DNS
		251	if (THISNODE->protocols & PROT_DNSv4)
		252	{
		253	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		254
		255	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		256
		257	if (dnsv4_fd < 0)
		258	return -1;
		259
		260	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		261	// this I really consider a linux bug. I am neither connected
		262	// nor do I fragment myself. Linux still sets DF and doesn't
		263	// fragment for me sometimes.
		264	{
		265	int oval = IP_PMTUDISC_DONT;
		266	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		267	}
		268	#endif
		269
		270	// standard daemon practise...
		271	{
		272	int oval = 1;
		273	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		274	}
		275
		276	sockinfo si (THISNODE->dns_hostname,
		277	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		278	PROT_DNSv4);
		279
		280	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
223	}	281	{
		282	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		283	exit (EXIT_FAILURE);
		284	}
224		285
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	286	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
226	}	287	}
227	#endif	288	#endif
228		289
229	tap = new tap_device ();	290	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	291	if (!tap) //D this, of course, never catches
231	{	292	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	293	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233	exit (1);	294	exit (EXIT_FAILURE);
234	}	295	}
235		296
		297	if (tap->if_up () &&
		298	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		299	{
		300	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		301	tap->if_up ());
		302	exit (EXIT_FAILURE);
		303	}
		304
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	305	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		306	{
		307	slog (L_ERR, _("if-up command execution failed, exiting."));
		308	exit (EXIT_FAILURE);
		309	}
237		310
238	tap_ev_watcher.start (tap->fd, POLLIN);	311	tap_ev_watcher.start (tap->fd, EVENT_READ);
239		312
240	reconnect_all ();	313	reconnect_all ();
241		314
242	return 0;	315	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	}	316	}
272		317
273	bool	318	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	319	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	320	{
		321	#if defined(SOL_IP) && defined(IP_TOS)
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	322	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		323	#endif
277	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	324	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278		325
279	return true;	326	return true;
280	}	327	}
281		328
…		…
300	sum += (sum >> 16); // carry	347	sum += (sum >> 16); // carry
301		348
302	return ~sum;	349	return ~sum;
303	}	350	}
304		351
		352	#if ENABLE_ICMP
305	bool	353	bool
306	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	354	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307	{	355	{
		356	#if defined(SOL_IP) && defined(IP_TOS)
308	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	357	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		358	#endif
309		359
310	pkt->unshift_hdr (4);	360	pkt->unshift_hdr (4);
311		361
312	icmphdr hdr = (icmphdr )&((*pkt)[0]);	362	icmp_header hdr = (icmp_header )&((*pkt)[0]);
313	hdr->type = ::conf.icmp_type;	363	hdr->type = ::conf.icmp_type;
314	hdr->code = 255;	364	hdr->code = 255;
315	hdr->checksum = 0;	365	hdr->checksum = 0;
316	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	366	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317		367
318	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	368	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		369
320	return true;	370	return true;
321	}	371	}
		372	#endif
322		373
323	bool	374	bool
324	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	375	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
325	{	376	{
		377	#if defined(SOL_IP) && defined(IP_TOS)
326	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	378	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		379	#endif
327	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	380	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
328		381
329	return true;	382	return true;
		383	}
		384
		385	void
		386	vpn::inject_data_packet (tap_packet *pkt, int dst)
		387	{
		388	if (dst)
		389	{
		390	// unicast
		391	if (dst != THISNODE->id)
		392	conns[dst - 1]->inject_data_packet (pkt);
		393	}
		394	else
		395	{
		396	// broadcast, this is ugly, but due to the security policy
		397	// we have to connect to all hosts...
		398	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		399	if ((*c)->conf != THISNODE)
		400	(*c)->inject_data_packet (pkt, true);
		401	}
330	}	402	}
331		403
332	void	404	void
333	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	405	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
334	{	406	{
…		…
348	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	420	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349	else	421	else
350	{	422	{
351	connection *c = conns[src - 1];	423	connection *c = conns[src - 1];
352		424
353	if (dst == 0 && !THISNODE->routerprio)	425	if (dst == 0)
354	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	426	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355	c->conf->nodename, (const char *)rsi);	427	c->conf->nodename, (const char *)rsi);
356	else if (dst != 0 && dst != THISNODE->id)	428	else if (dst != THISNODE->id)
357	{	429	{
358	if (THISNODE->routerprio)	430	if (THISNODE->routerprio)
359	// the tos setting gets lost here. who cares.	431	// the tos setting gets lost here. who cares.
360	conns[dst - 1]->inject_vpn_packet (pkt);	432	conns[dst - 1]->inject_vpn_packet (pkt);
361	else	433	else
…		…
367	else	439	else
368	c->recv_vpn_packet (pkt, rsi);	440	c->recv_vpn_packet (pkt, rsi);
369	}	441	}
370	}	442	}
371		443
		444	bool
		445	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		446	{
		447	switch (si.prot)
		448	{
		449	case PROT_IPv4:
		450	return send_ipv4_packet (pkt, si, tos);
		451	case PROT_UDPv4:
		452	return send_udpv4_packet (pkt, si, tos);
		453	#if ENABLE_TCP
		454	case PROT_TCPv4:
		455	return send_tcpv4_packet (pkt, si, tos);
		456	#endif
		457	#if ENABLE_ICMP
		458	case PROT_ICMPv4:
		459	return send_icmpv4_packet (pkt, si, tos);
		460	#endif
		461	#if ENABLE_DNS
		462	case PROT_DNSv4:
		463	return send_dnsv4_packet (pkt, si, tos);
		464	#endif
		465
		466	default:
		467	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		468	}
		469
		470	return false;
		471	}
		472
372	void	473	void
373	vpn::ipv4_ev (io_watcher &w, short revents)	474	vpn::ipv4_ev (io_watcher &w, short revents)
374	{	475	{
375	if (revents & (POLLIN \| POLLERR))	476	if (revents & EVENT_READ)
376	{	477	{
377	vpn_packet *pkt = new vpn_packet;	478	vpn_packet *pkt = new vpn_packet;
378	struct sockaddr_in sa;	479	struct sockaddr_in sa;
379	socklen_t sa_len = sizeof (sa);	480	socklen_t sa_len = sizeof (sa);
380	int len;	481	int len;
…		…
385		486
386	if (len > 0)	487	if (len > 0)
387	{	488	{
388	pkt->len = len;	489	pkt->len = len;
389		490
390	// raw sockets deliver the ipv4, but don't expect it on sends	491	// raw sockets deliver the ipv4 header, but don't expect it on sends
391	// this is slow, but...
392	pkt->skip_hdr (IP_OVERHEAD);	492	pkt->skip_hdr (IP_OVERHEAD);
393		493
394	recv_vpn_packet (pkt, si);	494	recv_vpn_packet (pkt, si);
395	}	495	}
396	else	496	else
…		…
399	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	499	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
400	}	500	}
401		501
402	delete pkt;	502	delete pkt;
403	}	503	}
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	504	else
411	{	505	{
412	slog (L_ERR,	506	slog (L_ERR,
413	_("FATAL: unknown revents %08x in socket, terminating\n"),	507	_("FATAL: unknown revents %08x in socket, terminating\n"),
414	revents);	508	revents);
415	exit (1);	509	exit (EXIT_FAILURE);
416	}	510	}
417	}	511	}
418		512
		513	#if ENABLE_ICMP
419	void	514	void
420	vpn::icmpv4_ev (io_watcher &w, short revents)	515	vpn::icmpv4_ev (io_watcher &w, short revents)
421	{	516	{
422	if (revents & (POLLIN \| POLLERR))	517	if (revents & EVENT_READ)
423	{	518	{
424	vpn_packet *pkt = new vpn_packet;	519	vpn_packet *pkt = new vpn_packet;
425	struct sockaddr_in sa;	520	struct sockaddr_in sa;
426	socklen_t sa_len = sizeof (sa);	521	socklen_t sa_len = sizeof (sa);
427	int len;	522	int len;
…		…
432		527
433	if (len > 0)	528	if (len > 0)
434	{	529	{
435	pkt->len = len;	530	pkt->len = len;
436		531
437	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	532	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
438		533
439	if (hdr->type == ::conf.icmp_type	534	if (hdr->type == ::conf.icmp_type
440	&& hdr->code == 255)	535	&& hdr->code == 255)
441	{	536	{
442	// raw sockets deliver the ipv4, but don't expect it on sends	537	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
452	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	547	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
453	}	548	}
454		549
455	delete pkt;	550	delete pkt;
456	}	551	}
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	552	else
464	{	553	{
465	slog (L_ERR,	554	slog (L_ERR,
466	_("FATAL: unknown revents %08x in socket, terminating\n"),	555	_("FATAL: unknown revents %08x in socket, terminating\n"),
467	revents);	556	revents);
468	exit (1);	557	exit (EXIT_FAILURE);
469	}	558	}
470	}	559	}
		560	#endif
471		561
472	void	562	void
473	vpn::udpv4_ev (io_watcher &w, short revents)	563	vpn::udpv4_ev (io_watcher &w, short revents)
474	{	564	{
475	if (revents & (POLLIN \| POLLERR))	565	if (revents & EVENT_READ)
476	{	566	{
477	vpn_packet *pkt = new vpn_packet;	567	vpn_packet *pkt = new vpn_packet;
478	struct sockaddr_in sa;	568	struct sockaddr_in sa;
479	socklen_t sa_len = sizeof (sa);	569	socklen_t sa_len = sizeof (sa);
480	int len;	570	int len;
…		…
495	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	585	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
496	}	586	}
497		587
498	delete pkt;	588	delete pkt;
499	}	589	}
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	590	else
507	{	591	{
508	slog (L_ERR,	592	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	593	_("FATAL: unknown revents %08x in socket, terminating\n"),
510	revents);	594	revents);
511	exit (1);	595	exit (EXIT_FAILURE);
512	}	596	}
513	}	597	}
514		598
515	void	599	void
516	vpn::tap_ev (io_watcher &w, short revents)	600	vpn::tap_ev (io_watcher &w, short revents)
517	{	601	{
518	if (revents & POLLIN)	602	if (revents & EVENT_READ)
519	{	603	{
520	/* process data */	604	/* process data */
521	tap_packet *pkt;	605	tap_packet *pkt;
522		606
523	pkt = tap->recv ();	607	pkt = tap->recv ();
524		608
		609	if (!pkt)
		610	return;
		611
		612	if (pkt->len > 14)
		613	{
525	int dst = mac2id (pkt->dst);	614	int dst = mac2id (pkt->dst);
526	int src = mac2id (pkt->src);	615	int src = mac2id (pkt->src);
527		616
528	if (src != THISNODE->id)	617	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	{	618	{
546	// unicast	619	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
547	if (dst != THISNODE->id)	620	exit (EXIT_FAILURE);
548	conns[dst - 1]->inject_data_packet (pkt);
549	}	621	}
		622
		623	if (dst == THISNODE->id)
		624	{
		625	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		626	exit (EXIT_FAILURE);
		627	}
		628
		629	if (dst > conns.size ())
		630	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
550	else	631	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);	632	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	}	633	}
563		634
564	delete pkt;	635	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	}	636	}
571	else	637	else
572	abort ();	638	abort ();
573	}	639	}
574		640
…		…
580	if (events & EVENT_SHUTDOWN)	646	if (events & EVENT_SHUTDOWN)
581	{	647	{
582	slog (L_INFO, _("preparing shutdown..."));	648	slog (L_INFO, _("preparing shutdown..."));
583		649
584	shutdown_all ();	650	shutdown_all ();
585
586	remove_pid (pidfilename);	651	remove_pid (conf.pidfilename);
587
588	slog (L_INFO, _("terminating"));	652	slog (L_INFO, _("terminating"));
589		653	exit (EXIT_SUCCESS);
590	exit (0);
591	}	654	}
592		655
593	if (events & EVENT_RECONNECT)	656	if (events & EVENT_RECONNECT)
594	{	657	{
595	slog (L_INFO, _("forced reconnect"));	658	slog (L_INFO, _("forced reconnect"));
…		…
597	reconnect_all ();	660	reconnect_all ();
598	}	661	}
599		662
600	events = 0;	663	events = 0;
601	}	664	}
602
603	w.at = TSTAMP_CANCEL;
604	}	665	}
605		666
606	void	667	void
607	vpn::shutdown_all ()	668	vpn::shutdown_all ()
608	{	669	{
…		…
621	connection_init ();	682	connection_init ();
622		683
623	for (configuration::node_vector::iterator i = conf.nodes.begin ();	684	for (configuration::node_vector::iterator i = conf.nodes.begin ();
624	i != conf.nodes.end (); ++i)	685	i != conf.nodes.end (); ++i)
625	{	686	{
626	connection *conn = new connection (this);	687	connection conn = new connection (this, i);
627
628	conn->conf = *i;
629	conns.push_back (conn);	688	conns.push_back (conn);
630
631	conn->establish_connection ();	689	conn->establish_connection ();
632	}	690	}
633	}	691	}
634		692
635	connection *vpn::find_router ()	693	connection *vpn::find_router ()
636	{	694	{
637	u32 prio = 0;	695	u32 prio = 1;
638	connection *router = 0;	696	connection *router = 0;
639		697
640	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	698	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641	{	699	{
642	connection c = i;	700	connection c = i;
643		701
644	if (c->conf->routerprio > prio	702	if (c->conf->routerprio > prio
645	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	703	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646	&& c->ictx && c->octx	704	&& c->ictx && c->octx
647	&& c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode	705	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648	&& (!THISNODE->routerprio
649	\|\| c->conf->routerprio <= THISNODE->routerprio))
650	{	706	{
651	prio = c->conf->routerprio;	707	prio = c->conf->routerprio;
652	router = c;	708	router = c;
653	}	709	}
654	}	710	}
…		…
663	if (c)	719	if (c)
664	c->send_connect_request (id);	720	c->send_connect_request (id);
665	else	721	else
666	// no router found, aggressively connect to all routers	722	// no router found, aggressively connect to all routers
667	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	723	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668	if ((*i)->conf->routerprio)	724	if ((i)->conf->routerprio && (i)->conf != THISNODE)
669	(*i)->establish_connection ();	725	(*i)->establish_connection ();
670	}	726	}
671		727
672	void	728	void
673	connection::dump_status ()	729	connection::dump_status ()
…		…
700	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	756	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
701	#endif	757	#endif
702	#if ENABLE_ICMP	758	#if ENABLE_ICMP
703	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	759	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
704	#endif	760	#endif
		761	#if ENABLE_DNS
		762	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		763	#endif
705	, tap_ev_watcher (this, &vpn::tap_ev)	764	, tap_ev_watcher (this, &vpn::tap_ev)
706	{	765	{
707	}	766	}
708		767
709	vpn::~vpn ()	768	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 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.11 by pcg, Sun Apr 13 00:35:46 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC