[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 1.39 by pcg, Sat Nov 10 05:14:22 2007 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 <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"
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	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		114
		115	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	116	// this I really consider a linux bug. I am neither connected
88	// 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
89	// fragment for me sometimes.	118	// fragment for me sometimes.
90	{	119	{
91	int oval = IP_PMTUDISC_DONT;	120	int oval = IP_PMTUDISC_DONT;
…		…
96	sockinfo si (THISNODE, PROT_IPv4);	125	sockinfo si (THISNODE, PROT_IPv4);
97		126
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	127	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	128	{
100	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));
101	exit (1);	130	exit (EXIT_FAILURE);
102	}	131	}
103		132
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	133	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
105	}	134	}
106		135
107	udpv4_fd = -1;	136	udpv4_fd = -1;
108		137
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	138	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	139	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	140	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		141
113	if (udpv4_fd < 0)	142	if (udpv4_fd < 0)
114	return -1;	143	return -1;
		144
		145	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		146	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
115		147
116	// standard daemon practise...	148	// standard daemon practise...
117	{	149	{
118	int oval = 1;	150	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	151	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	152	}
121		153
122	#ifdef IP_MTU_DISCOVER	154	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	155	// this I really consider a linux bug. I am neither connected
124	// 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
125	// fragment for me sometimes.	157	// fragment for me sometimes.
126	{	158	{
127	int oval = IP_PMTUDISC_DONT;	159	int oval = IP_PMTUDISC_DONT;
…		…
132	sockinfo si (THISNODE, PROT_UDPv4);	164	sockinfo si (THISNODE, PROT_UDPv4);
133		165
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	166	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	167	{
136	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));
137	exit (1);	169	exit (EXIT_FAILURE);
138	}	170	}
139		171
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	172	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
141	}	173	}
142		174
143	icmpv4_fd = -1;	175	icmpv4_fd = -1;
144		176
145	#if ENABLE_ICMP	177	#if ENABLE_ICMP
…		…
147	{	179	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	180	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		181
150	if (icmpv4_fd < 0)	182	if (icmpv4_fd < 0)
151	return -1;	183	return -1;
		184
		185	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		186	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
152		187
153	#ifdef ICMP_FILTER	188	#ifdef ICMP_FILTER
154	{	189	{
155	icmp_filter oval;	190	icmp_filter oval;
156	oval.data = 0xffffffff;	191	oval.data = 0xffffffff;
…		…
159		194
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	195	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	196	}
162	#endif	197	#endif
163		198
164	#ifdef IP_MTU_DISCOVER	199	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	200	// this I really consider a linux bug. I am neither connected
166	// 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
167	// fragment for me sometimes.	202	// fragment for me sometimes.
168	{	203	{
169	int oval = IP_PMTUDISC_DONT;	204	int oval = IP_PMTUDISC_DONT;
170	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	205	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171	}	206	}
172	#endif	207	#endif
173		208
174	sockinfo si (THISNODE, PROT_ICMPv4);	209	sockinfo si (THISNODE, PROT_ICMPv4);
175		210
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	211	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	212	{
178	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));
179	exit (1);	214	exit (EXIT_FAILURE);
180	}	215	}
181		216
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	217	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
183	}	218	}
184	#endif	219	#endif
185		220
186	tcpv4_fd = -1;	221	tcpv4_fd = -1;
187		222
…		…
190	{	225	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	226	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		227
193	if (tcpv4_fd < 0)	228	if (tcpv4_fd < 0)
194	return -1;	229	return -1;
		230
		231	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		232	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
195		233
196	// standard daemon practise...	234	// standard daemon practise...
197	{	235	{
198	int oval = 1;	236	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	237	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
202	sockinfo si (THISNODE, PROT_TCPv4);	240	sockinfo si (THISNODE, PROT_TCPv4);
203		241
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	242	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	243	{
206	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));
207	exit (1);	245	exit (EXIT_FAILURE);
208	}	246	}
209		247
210	if (listen (tcpv4_fd, 5))	248	if (listen (tcpv4_fd, 5))
211	{	249	{
212	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));
213	exit (1);	251	exit (EXIT_FAILURE);
		252	}
		253
		254	tcpv4_ev_watcher.start (tcpv4_fd, EV_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);
214	}	278	}
215
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
217	}
218	#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, EV_READ);
		298	}
		299	#endif
		300
		301	/////////////////////////////////////////////////////////////////////////////
		302
		303	reconnect_all ();
		304
		305	/////////////////////////////////////////////////////////////////////////////
219		306
220	tap = new tap_device ();	307	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	308	if (!tap) //D this, of course, never catches
222	{	309	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	310	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
224	exit (1);	311	exit (EXIT_FAILURE);
225	}	312	}
226		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
227	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	}
228		329
229	tap_ev_watcher.start (tap->fd, POLLIN);	330	tap_ev_watcher.start (tap->fd, EV_READ);
230
231	reconnect_all ();
232		331
233	return 0;	332	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	}	333	}
263		334
264	bool	335	bool
265	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)
266	{	337	{
		338	#if defined(SOL_IP) && defined(IP_TOS)
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	339	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		340	#endif
268	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 ());
269		342
270	return true;	343	return true;
271	}	344	}
272		345
…		…
291	sum += (sum >> 16); // carry	364	sum += (sum >> 16); // carry
292		365
293	return ~sum;	366	return ~sum;
294	}	367	}
295		368
		369	#if ENABLE_ICMP
296	bool	370	bool
297	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)
298	{	372	{
		373	#if defined(SOL_IP) && defined(IP_TOS)
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	374	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		375	#endif
300		376
301	pkt->unshift_hdr (4);	377	pkt->unshift_hdr (4);
302		378
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	379	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	380	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	381	hdr->code = 255;
306	hdr->checksum = 0;	382	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	383	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		384
309	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 ());
310		386
311	return true;	387	return true;
312	}	388	}
		389	#endif
313		390
314	bool	391	bool
315	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)
316	{	393	{
		394	#if defined(SOL_IP) && defined(IP_TOS)
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	395	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		396	#endif
318	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 ());
319		398
320	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	}
321	}	419	}
322		420
323	void	421	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	422	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	423	{
…		…
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	437	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	438	else
341	{	439	{
342	connection *c = conns[src - 1];	440	connection *c = conns[src - 1];
343		441
344	if (dst == 0 && !THISNODE->routerprio)	442	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	443	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346	c->conf->nodename, (const char *)rsi);	444	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	445	else if (dst != THISNODE->id)
348	{	446	{
349	if (THISNODE->routerprio)	447	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	448	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	449	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	450	else
…		…
358	else	456	else
359	c->recv_vpn_packet (pkt, rsi);	457	c->recv_vpn_packet (pkt, rsi);
360	}	458	}
361	}	459	}
362		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
363	void	490	void
364	vpn::ipv4_ev (io_watcher &w, short revents)	491	vpn::ipv4_ev (ev::io &w, int revents)
365	{	492	{
366	if (revents & (POLLIN \| POLLERR))	493	if (revents & EV_READ)
367	{	494	{
368	vpn_packet *pkt = new vpn_packet;	495	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	496	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	497	socklen_t sa_len = sizeof (sa);
371	int len;	498	int len;
…		…
376		503
377	if (len > 0)	504	if (len > 0)
378	{	505	{
379	pkt->len = len;	506	pkt->len = len;
380		507
381	// 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
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	509	pkt->skip_hdr (IP_OVERHEAD);
384		510
385	recv_vpn_packet (pkt, si);	511	recv_vpn_packet (pkt, si);
386	}	512	}
387	else	513	else
…		…
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	516	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
391	}	517	}
392		518
393	delete pkt;	519	delete pkt;
394	}	520	}
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	521	else
402	{	522	{
403	slog (L_ERR,	523	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	524	_("FATAL: unknown revents %08x in socket, terminating\n"),
405	revents);	525	revents);
406	exit (1);	526	exit (EXIT_FAILURE);
407	}	527	}
408	}	528	}
409		529
		530	#if ENABLE_ICMP
410	void	531	void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	532	vpn::icmpv4_ev (ev::io &w, int revents)
412	{	533	{
413	if (revents & (POLLIN \| POLLERR))	534	if (revents & EV_READ)
414	{	535	{
415	vpn_packet *pkt = new vpn_packet;	536	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	537	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	538	socklen_t sa_len = sizeof (sa);
418	int len;	539	int len;
…		…
423		544
424	if (len > 0)	545	if (len > 0)
425	{	546	{
426	pkt->len = len;	547	pkt->len = len;
427		548
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	549	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		550
430	if (hdr->type == ::conf.icmp_type	551	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	552	&& hdr->code == 255)
432	{	553	{
433	// 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
…		…
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	564	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
444	}	565	}
445		566
446	delete pkt;	567	delete pkt;
447	}	568	}
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	569	else
455	{	570	{
456	slog (L_ERR,	571	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	572	_("FATAL: unknown revents %08x in socket, terminating\n"),
458	revents);	573	revents);
459	exit (1);	574	exit (EXIT_FAILURE);
460	}	575	}
461	}	576	}
		577	#endif
462		578
463	void	579	void
464	vpn::udpv4_ev (io_watcher &w, short revents)	580	vpn::udpv4_ev (ev::io &w, int revents)
465	{	581	{
466	if (revents & (POLLIN \| POLLERR))	582	if (revents & EV_READ)
467	{	583	{
468	vpn_packet *pkt = new vpn_packet;	584	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	585	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	586	socklen_t sa_len = sizeof (sa);
471	int len;	587	int len;
…		…
486	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));
487	}	603	}
488		604
489	delete pkt;	605	delete pkt;
490	}	606	}
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	607	else
498	{	608	{
499	slog (L_ERR,	609	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	610	_("FATAL: unknown revents %08x in socket, terminating\n"),
501	revents);	611	revents);
502	exit (1);	612	exit (EXIT_FAILURE);
503	}	613	}
504	}	614	}
505		615
506	void	616	void
507	vpn::tap_ev (io_watcher &w, short revents)	617	vpn::tap_ev (ev::io &w, int revents)
508	{	618	{
509	if (revents & POLLIN)	619	if (revents & EV_READ)
510	{	620	{
511	/* process data */	621	/* process data */
512	tap_packet *pkt;	622	tap_packet *pkt;
513		623
514	pkt = tap->recv ();	624	pkt = tap->recv ();
515		625
		626	if (!pkt)
		627	return;
		628
		629	if (pkt->len > 14)
		630	{
516	int dst = mac2id (pkt->dst);	631	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	632	int src = mac2id (pkt->src);
518		633
519	if (src != THISNODE->id)	634	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	{	635	{
537	// unicast	636	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	637	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	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);
541	else	648	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);	649	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	}	650	}
554		651
555	delete pkt;	652	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	}	653	}
562	else	654	else
563	abort ();	655	abort ();
564	}	656	}
565		657
566	void	658	void
567	vpn::event_cb (time_watcher &w)	659	vpn::event_cb (ev::timer &w, int)
568	{	660	{
569	if (events)	661	if (events)
570	{	662	{
571	if (events & EVENT_SHUTDOWN)	663	if (events & EVENT_SHUTDOWN)
572	{	664	{
573	slog (L_INFO, _("preparing shutdown..."));	665	slog (L_INFO, _("preparing shutdown..."));
574		666
575	shutdown_all ();	667	shutdown_all ();
576
577	remove_pid (pidfilename);	668	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	669	slog (L_INFO, _("terminating"));
580		670	exit (EXIT_SUCCESS);
581	exit (0);
582	}	671	}
583		672
584	if (events & EVENT_RECONNECT)	673	if (events & EVENT_RECONNECT)
585	{	674	{
586	slog (L_INFO, _("forced reconnect"));	675	slog (L_INFO, _("forced reconnect"));
…		…
588	reconnect_all ();	677	reconnect_all ();
589	}	678	}
590		679
591	events = 0;	680	events = 0;
592	}	681	}
593
594	w.at = TSTAMP_CANCEL;
595	}	682	}
596		683
597	void	684	void
598	vpn::shutdown_all ()	685	vpn::shutdown_all ()
599	{	686	{
…		…
612	connection_init ();	699	connection_init ();
613		700
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	701	for (configuration::node_vector::iterator i = conf.nodes.begin ();
615	i != conf.nodes.end (); ++i)	702	i != conf.nodes.end (); ++i)
616	{	703	{
617	connection *conn = new connection (this);	704	connection conn = new connection (this, i);
618
619	conn->conf = *i;
620	conns.push_back (conn);	705	conns.push_back (conn);
621
622	conn->establish_connection ();	706	conn->establish_connection ();
623	}	707	}
624	}	708	}
625		709
626	connection *vpn::find_router ()	710	connection *vpn::find_router ()
627	{	711	{
628	u32 prio = 0;	712	u32 prio = 1;
629	connection *router = 0;	713	connection *router = 0;
630		714
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	715	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	716	{
633	connection c = i;	717	connection c = i;
634		718
635	if (c->conf->routerprio > prio	719	if (c->conf->routerprio > prio
636	&& c->connectmode == conf_node::C_ALWAYS	720	&& 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)	721	&& c->ictx && c->octx
		722	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639	{	723	{
640	prio = c->conf->routerprio;	724	prio = c->conf->routerprio;
641	router = c;	725	router = c;
642	}	726	}
643	}	727	}
…		…
652	if (c)	736	if (c)
653	c->send_connect_request (id);	737	c->send_connect_request (id);
654	else	738	else
655	// no router found, aggressively connect to all routers	739	// no router found, aggressively connect to all routers
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	740	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	if ((*i)->conf->routerprio)	741	if ((i)->conf->routerprio && (i)->conf != THISNODE)
658	(*i)->establish_connection ();	742	(*i)->establish_connection ();
659	}	743	}
660		744
661	void	745	void
662	connection::dump_status ()	746	connection::dump_status ()
…		…
671	}	755	}
672		756
673	void	757	void
674	vpn::dump_status ()	758	vpn::dump_status ()
675	{	759	{
676	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	760	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev::ev_now ());
677		761
678	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	762	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
679	(*c)->dump_status ();	763	(*c)->dump_status ();
680		764
681	slog (L_NOTICE, _("END status dump"));	765	slog (L_NOTICE, _("END status dump"));
…		…
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	773	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
690	#endif	774	#endif
691	#if ENABLE_ICMP	775	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	776	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
693	#endif	777	#endif
		778	#if ENABLE_DNS
		779	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		780	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	781	, tap_ev_watcher (this, &vpn::tap_ev)
695	{	782	{
696	}	783	}
697		784
698	vpn::~vpn ()	785	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs. Revision 1.39 by pcg, Sat Nov 10 05:14:22 2007 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 1.39 by pcg, Sat Nov 10 05:14:22 2007 UTC