[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 1.44 by pcg, Tue Dec 4 17:17:20 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) 2003-2007 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <errno.h>	33	#include <errno.h>
32	#include <time.h>	34	#include <time.h>
33	#include <unistd.h>	35	#include <unistd.h>
34	#include <fcntl.h>	36	#include <fcntl.h>
35	#include <arpa/inet.h>	37	#include <sys/socket.h>
36	#include <netinet/in.h>	38
37	#include <netinet/ip_icmp.h>	39	#include "netcompat.h"
38		40
39	#include "pidfile.h"	41	#include "pidfile.h"
40		42
41	#include "connection.h"	43	#include "connection.h"
42	#include "util.h"	44	#include "util.h"
43	#include "vpn.h"	45	#include "vpn.h"
44		46
		47	vpn network; // THE vpn (bad design...)
		48
45	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
46		50
47	const char *vpn::script_if_up ()	51	static void inline
		52	set_tos (int fd, int &tos_prev, int tos)
		53	{
		54	#if defined(SOL_IP) && defined(IP_TOS)
		55	if (tos_prev == tos)
		56	return;
		57
		58	tos_prev = tos;
		59	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		60	#endif
		61	}
		62
		63	void
		64	vpn::script_init_env ()
48	{	65	{
49	// the tunnel device mtu should be the physical mtu - overhead	66	// the tunnel device mtu should be the physical mtu - overhead
50	// the tricky part is rounding to the cipher key blocksize	67	// the tricky part is rounding to the cipher key blocksize
51	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
52	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55		72
56	char *env;	73	char *env;
57	asprintf (&env, "CONFBASE=%s", confbase);	74	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
60	putenv (env);
61	asprintf (&env, "NODEID=%d", THISNODE->id);
62	putenv (env);
63	asprintf (&env, "IFNAME=%s", tap->interface ());	75	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64	putenv (env);	76	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		77	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65	asprintf (&env, "MTU=%d", mtu);	78	asprintf (&env, "MTU=%d", mtu); putenv (env);
66	putenv (env);	79	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	80	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69	THISNODE->id & 0xff);
70	putenv (env);
71		81
		82	conns [THISNODE->id - 1]->script_init_env ("");
		83
		84	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		85	{
		86	char ext[16];
		87	snprintf (ext, 16, "_%d", (*c)->conf->id);
		88	(*c)->script_init_env (ext);
		89	}
		90	}
		91
		92	const char *vpn::script_if_init ()
		93	{
		94	script_init_env ();
		95
		96	return tap->if_up ();
		97	}
		98
		99	const char *vpn::script_if_up ()
		100	{
		101	script_init_env ();
		102
		103	char *filename;
		104	asprintf (&filename,
		105	"%s/%s",
		106	confbase,
72	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	107	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		108
		109	return filename;
73	}	110	}
74		111
75	int	112	int
76	vpn::setup ()	113	vpn::setup ()
77	{	114	{
		115	ipv4_tos = -1;
78	ipv4_fd = -1;	116	ipv4_fd = -1;
79		117
80	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	118	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81	{	119	{
82	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	120	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
83		121
84	if (ipv4_fd < 0)	122	if (ipv4_fd < 0)
85	return -1;	123	return -1;
86		124
87	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);	125	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		126	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
88		127
89	#ifdef IP_MTU_DISCOVER	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
91	// 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
92	// fragment for me sometimes.	131	// fragment for me sometimes.
93	{	132	{
94	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
99	sockinfo si (THISNODE, PROT_IPv4);	138	sockinfo si (THISNODE, PROT_IPv4);
100		139
101	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	140	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102	{	141	{
103	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	142	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
104	exit (1);	143	exit (EXIT_FAILURE);
105	}	144	}
106		145
107	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	146	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
108	}	147	}
109		148
		149	udpv4_tos = -1;
110	udpv4_fd = -1;	150	udpv4_fd = -1;
111		151
112	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	152	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
113	{	153	{
114	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	154	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
115		155
116	if (udpv4_fd < 0)	156	if (udpv4_fd < 0)
117	return -1;	157	return -1;
118		158
119	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);	159	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		160	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
120		161
121	// standard daemon practise...	162	// standard daemon practise...
122	{	163	{
123	int oval = 1;	164	int oval = 1;
124	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	165	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125	}	166	}
126		167
127	#ifdef IP_MTU_DISCOVER	168	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128	// this I really consider a linux bug. I am neither connected	169	// this I really consider a linux bug. I am neither connected
129	// nor do I fragment myself. Linux still sets DF and doesn't	170	// nor do I fragment myself. Linux still sets DF and doesn't
130	// fragment for me sometimes.	171	// fragment for me sometimes.
131	{	172	{
132	int oval = IP_PMTUDISC_DONT;	173	int oval = IP_PMTUDISC_DONT;
…		…
137	sockinfo si (THISNODE, PROT_UDPv4);	178	sockinfo si (THISNODE, PROT_UDPv4);
138		179
139	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	180	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140	{	181	{
141	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	182	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
142	exit (1);	183	exit (EXIT_FAILURE);
143	}	184	}
144		185
145	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	186	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
146	}	187	}
147		188
		189	icmpv4_tos = -1;
148	icmpv4_fd = -1;	190	icmpv4_fd = -1;
149		191
150	#if ENABLE_ICMP	192	#if ENABLE_ICMP
151	if (THISNODE->protocols & PROT_ICMPv4)	193	if (THISNODE->protocols & PROT_ICMPv4)
152	{	194	{
153	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	195	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
154		196
155	if (icmpv4_fd < 0)	197	if (icmpv4_fd < 0)
156	return -1;	198	return -1;
157		199
158	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);	200	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		201	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
159		202
160	#ifdef ICMP_FILTER	203	#ifdef ICMP_FILTER
161	{	204	{
162	icmp_filter oval;	205	icmp_filter oval;
163	oval.data = 0xffffffff;	206	oval.data = 0xffffffff;
…		…
166		209
167	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	210	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168	}	211	}
169	#endif	212	#endif
170		213
171	#ifdef IP_MTU_DISCOVER	214	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172	// this I really consider a linux bug. I am neither connected	215	// this I really consider a linux bug. I am neither connected
173	// nor do I fragment myself. Linux still sets DF and doesn't	216	// nor do I fragment myself. Linux still sets DF and doesn't
174	// fragment for me sometimes.	217	// fragment for me sometimes.
175	{	218	{
176	int oval = IP_PMTUDISC_DONT;	219	int oval = IP_PMTUDISC_DONT;
177	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	220	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178	}	221	}
179	#endif	222	#endif
180		223
181	sockinfo si (THISNODE, PROT_ICMPv4);	224	sockinfo si (THISNODE, PROT_ICMPv4);
182		225
183	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	226	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184	{	227	{
185	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	228	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
186	exit (1);	229	exit (EXIT_FAILURE);
187	}	230	}
188		231
189	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	232	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
190	}	233	}
191	#endif	234	#endif
192		235
193	tcpv4_fd = -1;	236	tcpv4_fd = -1;
194		237
…		…
199		242
200	if (tcpv4_fd < 0)	243	if (tcpv4_fd < 0)
201	return -1;	244	return -1;
202		245
203	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);	246	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		247	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
204		248
205	// standard daemon practise...	249	// standard daemon practise...
206	{	250	{
207	int oval = 1;	251	int oval = 1;
208	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	252	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
211	sockinfo si (THISNODE, PROT_TCPv4);	255	sockinfo si (THISNODE, PROT_TCPv4);
212		256
213	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	257	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214	{	258	{
215	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	259	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
216	exit (1);	260	exit (EXIT_FAILURE);
217	}	261	}
218		262
219	if (listen (tcpv4_fd, 5))	263	if (listen (tcpv4_fd, 5))
220	{	264	{
221	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	265	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
222	exit (1);	266	exit (EXIT_FAILURE);
		267	}
		268
		269	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		270	}
		271	#endif
		272
		273	dnsv4_tos = -1;
		274	dnsv4_fd = -1;
		275
		276	#if ENABLE_DNS
		277	if (THISNODE->protocols & PROT_DNSv4)
		278	{
		279	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		280
		281	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		282
		283	if (dnsv4_fd < 0)
		284	return -1;
		285
		286	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		287	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		288
		289	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		290	// this I really consider a linux bug. I am neither connected
		291	// nor do I fragment myself. Linux still sets DF and doesn't
		292	// fragment for me sometimes.
		293	{
		294	int oval = IP_PMTUDISC_DONT;
		295	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
223	}	296	}
224
225	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
226	}
227	#endif	297	# endif
		298
		299	// standard daemon practise...
		300	{
		301	int oval = 1;
		302	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		303	}
		304
		305	sockinfo si (THISNODE->dns_hostname,
		306	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		307	PROT_DNSv4);
		308
		309	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		310	{
		311	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		312	exit (EXIT_FAILURE);
		313	}
		314
		315	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		316	}
		317	#endif
		318
		319	/////////////////////////////////////////////////////////////////////////////
		320
		321	reconnect_all ();
		322
		323	/////////////////////////////////////////////////////////////////////////////
228		324
229	tap = new tap_device ();	325	tap = new tap_device ();
230	if (!tap) //D this, of course, never catches	326	if (!tap) //D this, of course, never catches
231	{	327	{
232	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	328	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233	exit (1);	329	exit (EXIT_FAILURE);
234	}	330	}
235		331
236	run_script (run_script_cb (this, &vpn::script_if_up), true);	332	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
237		333
		334	run_script_cb cb;
		335	cb.set<vpn, &vpn::script_if_init> (this);
		336
		337	if (tap->if_up () &&
		338	!run_script (cb, true))
		339	{
		340	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		341	tap->if_up ());
		342	exit (EXIT_FAILURE);
		343	}
		344
		345	cb.set<vpn, &vpn::script_if_up> (this);
		346	if (!run_script (cb, true))
		347	{
		348	slog (L_ERR, _("if-up command execution failed, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
238	tap_ev_watcher.start (tap->fd, POLLIN);	352	tap_ev_watcher.start (tap->fd, EV_READ);
239
240	reconnect_all ();
241		353
242	return 0;	354	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	}	355	}
272		356
273	bool	357	bool
274	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	358	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	359	{
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	360	set_tos (ipv4_fd, ipv4_tos, tos);
277	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	361	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278		362
279	return true;	363	return true;
280	}	364	}
281		365
…		…
300	sum += (sum >> 16); // carry	384	sum += (sum >> 16); // carry
301		385
302	return ~sum;	386	return ~sum;
303	}	387	}
304		388
		389	#if ENABLE_ICMP
305	bool	390	bool
306	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	391	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307	{	392	{
308	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
309
310	pkt->unshift_hdr (4);	393	pkt->unshift_hdr (4);
311		394
312	icmphdr hdr = (icmphdr )&((*pkt)[0]);	395	icmp_header hdr = (icmp_header )&((*pkt)[0]);
313	hdr->type = ::conf.icmp_type;	396	hdr->type = ::conf.icmp_type;
314	hdr->code = 255;	397	hdr->code = 255;
315	hdr->checksum = 0;	398	hdr->checksum = 0;
316	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	399	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317		400
		401	set_tos (icmpv4_fd, icmpv4_tos, tos);
318	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	402	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		403
320	return true;	404	return true;
321	}	405	}
		406	#endif
322		407
323	bool	408	bool
324	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	409	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
325	{	410	{
326	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	411	set_tos (udpv4_fd, udpv4_tos, tos);
327	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	412	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
328		413
329	return true;	414	return true;
		415	}
		416
		417	void
		418	vpn::inject_data_packet (tap_packet *pkt, int dst)
		419	{
		420	if (dst)
		421	{
		422	// unicast
		423	if (dst != THISNODE->id)
		424	conns[dst - 1]->inject_data_packet (pkt);
		425	}
		426	else
		427	{
		428	// broadcast, this is ugly, but due to the security policy
		429	// we have to connect to all hosts...
		430	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		431	if ((*c)->conf != THISNODE)
		432	(*c)->inject_data_packet (pkt, true);
		433	}
330	}	434	}
331		435
332	void	436	void
333	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	437	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
334	{	438	{
…		…
348	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	452	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349	else	453	else
350	{	454	{
351	connection *c = conns[src - 1];	455	connection *c = conns[src - 1];
352		456
353	if (dst == 0 && !THISNODE->routerprio)	457	if (dst == 0)
354	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	458	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355	c->conf->nodename, (const char *)rsi);	459	c->conf->nodename, (const char *)rsi);
356	else if (dst != 0 && dst != THISNODE->id)	460	else if (dst != THISNODE->id)
357	{	461	{
358	if (THISNODE->routerprio)	462	if (THISNODE->routerprio)
359	// the tos setting gets lost here. who cares.	463	// the tos setting gets lost here. who cares.
360	conns[dst - 1]->inject_vpn_packet (pkt);	464	conns[dst - 1]->inject_vpn_packet (pkt);
361	else	465	else
…		…
367	else	471	else
368	c->recv_vpn_packet (pkt, rsi);	472	c->recv_vpn_packet (pkt, rsi);
369	}	473	}
370	}	474	}
371		475
		476	bool
		477	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		478	{
		479	switch (si.prot)
		480	{
		481	case PROT_IPv4:
		482	return send_ipv4_packet (pkt, si, tos);
		483
		484	case PROT_UDPv4:
		485	return send_udpv4_packet (pkt, si, tos);
		486
		487	#if ENABLE_TCP
		488	case PROT_TCPv4:
		489	return send_tcpv4_packet (pkt, si, tos);
		490	#endif
		491	#if ENABLE_ICMP
		492	case PROT_ICMPv4:
		493	return send_icmpv4_packet (pkt, si, tos);
		494	#endif
		495	#if ENABLE_DNS
		496	case PROT_DNSv4:
		497	return send_dnsv4_packet (pkt, si, tos);
		498	#endif
		499	default:
		500	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		501	}
		502
		503	return false;
		504	}
		505
372	void	506	void
373	vpn::ipv4_ev (io_watcher &w, short revents)	507	vpn::ipv4_ev (ev::io &w, int revents)
374	{	508	{
375	if (revents & (POLLIN \| POLLERR))	509	if (revents & EV_READ)
376	{	510	{
377	vpn_packet *pkt = new vpn_packet;	511	vpn_packet *pkt = new vpn_packet;
378	struct sockaddr_in sa;	512	struct sockaddr_in sa;
379	socklen_t sa_len = sizeof (sa);	513	socklen_t sa_len = sizeof (sa);
380	int len;	514	int len;
…		…
385		519
386	if (len > 0)	520	if (len > 0)
387	{	521	{
388	pkt->len = len;	522	pkt->len = len;
389		523
390	// raw sockets deliver the ipv4, but don't expect it on sends	524	// raw sockets deliver the ipv4 header, but don't expect it on sends
391	// this is slow, but...
392	pkt->skip_hdr (IP_OVERHEAD);	525	pkt->skip_hdr (IP_OVERHEAD);
393		526
394	recv_vpn_packet (pkt, si);	527	recv_vpn_packet (pkt, si);
395	}	528	}
396	else	529	else
…		…
399	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	532	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
400	}	533	}
401		534
402	delete pkt;	535	delete pkt;
403	}	536	}
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	537	else
411	{	538	{
412	slog (L_ERR,	539	slog (L_ERR,
413	_("FATAL: unknown revents %08x in socket, terminating\n"),	540	_("FATAL: unknown revents %08x in socket, terminating\n"),
414	revents);	541	revents);
415	exit (1);	542	exit (EXIT_FAILURE);
416	}	543	}
417	}	544	}
418		545
		546	#if ENABLE_ICMP
419	void	547	void
420	vpn::icmpv4_ev (io_watcher &w, short revents)	548	vpn::icmpv4_ev (ev::io &w, int revents)
421	{	549	{
422	if (revents & (POLLIN \| POLLERR))	550	if (revents & EV_READ)
423	{	551	{
424	vpn_packet *pkt = new vpn_packet;	552	vpn_packet *pkt = new vpn_packet;
425	struct sockaddr_in sa;	553	struct sockaddr_in sa;
426	socklen_t sa_len = sizeof (sa);	554	socklen_t sa_len = sizeof (sa);
427	int len;	555	int len;
…		…
432		560
433	if (len > 0)	561	if (len > 0)
434	{	562	{
435	pkt->len = len;	563	pkt->len = len;
436		564
437	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	565	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
438		566
439	if (hdr->type == ::conf.icmp_type	567	if (hdr->type == ::conf.icmp_type
440	&& hdr->code == 255)	568	&& hdr->code == 255)
441	{	569	{
442	// raw sockets deliver the ipv4, but don't expect it on sends	570	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
452	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	580	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
453	}	581	}
454		582
455	delete pkt;	583	delete pkt;
456	}	584	}
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	585	else
464	{	586	{
465	slog (L_ERR,	587	slog (L_ERR,
466	_("FATAL: unknown revents %08x in socket, terminating\n"),	588	_("FATAL: unknown revents %08x in socket, terminating\n"),
467	revents);	589	revents);
468	exit (1);	590	exit (EXIT_FAILURE);
469	}	591	}
470	}	592	}
		593	#endif
471		594
472	void	595	void
473	vpn::udpv4_ev (io_watcher &w, short revents)	596	vpn::udpv4_ev (ev::io &w, int revents)
474	{	597	{
475	if (revents & (POLLIN \| POLLERR))	598	if (revents & EV_READ)
476	{	599	{
477	vpn_packet *pkt = new vpn_packet;	600	vpn_packet *pkt = new vpn_packet;
478	struct sockaddr_in sa;	601	struct sockaddr_in sa;
479	socklen_t sa_len = sizeof (sa);	602	socklen_t sa_len = sizeof (sa);
480	int len;	603	int len;
…		…
495	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	618	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
496	}	619	}
497		620
498	delete pkt;	621	delete pkt;
499	}	622	}
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	623	else
507	{	624	{
508	slog (L_ERR,	625	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	626	_("FATAL: unknown revents %08x in socket, terminating\n"),
510	revents);	627	revents);
511	exit (1);	628	exit (EXIT_FAILURE);
512	}	629	}
513	}	630	}
514		631
515	void	632	void
516	vpn::tap_ev (io_watcher &w, short revents)	633	vpn::tap_ev (ev::io &w, int revents)
517	{	634	{
518	if (revents & POLLIN)	635	if (revents & EV_READ)
519	{	636	{
520	/* process data */	637	/* process data */
521	tap_packet *pkt;	638	tap_packet *pkt;
522		639
523	pkt = tap->recv ();	640	pkt = tap->recv ();
524		641
		642	if (!pkt)
		643	return;
		644
		645	if (pkt->len > 14)
		646	{
525	int dst = mac2id (pkt->dst);	647	int dst = mac2id (pkt->dst);
526	int src = mac2id (pkt->src);	648	int src = mac2id (pkt->src);
527		649
528	if (src != THISNODE->id)	650	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	{	651	{
546	// unicast	652	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
547	if (dst != THISNODE->id)	653	exit (EXIT_FAILURE);
548	conns[dst - 1]->inject_data_packet (pkt);
549	}	654	}
		655
		656	if (dst == THISNODE->id)
		657	{
		658	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		659	exit (EXIT_FAILURE);
		660	}
		661
		662	if (dst > conns.size ())
		663	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
550	else	664	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);	665	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	}	666	}
563		667
564	delete pkt;	668	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	}	669	}
571	else	670	else
572	abort ();	671	abort ();
573	}	672	}
574		673
575	void	674	void
576	vpn::event_cb (time_watcher &w)	675	vpn::event_cb (ev::timer &w, int)
577	{	676	{
578	if (events)	677	if (events)
579	{	678	{
580	if (events & EVENT_SHUTDOWN)	679	if (events & EVENT_SHUTDOWN)
581	{	680	{
582	slog (L_INFO, _("preparing shutdown..."));	681	slog (L_INFO, _("preparing shutdown..."));
583		682
584	shutdown_all ();	683	shutdown_all ();
585
586	remove_pid (pidfilename);	684	remove_pid (conf.pidfilename);
587
588	slog (L_INFO, _("terminating"));	685	slog (L_INFO, _("terminating"));
589		686	exit (EXIT_SUCCESS);
590	exit (0);
591	}	687	}
592		688
593	if (events & EVENT_RECONNECT)	689	if (events & EVENT_RECONNECT)
594	{	690	{
595	slog (L_INFO, _("forced reconnect"));	691	slog (L_INFO, _("forced reconnect"));
…		…
597	reconnect_all ();	693	reconnect_all ();
598	}	694	}
599		695
600	events = 0;	696	events = 0;
601	}	697	}
602
603	w.at = TSTAMP_CANCEL;
604	}	698	}
605		699
606	void	700	void
607	vpn::shutdown_all ()	701	vpn::shutdown_all ()
608	{	702	{
…		…
621	connection_init ();	715	connection_init ();
622		716
623	for (configuration::node_vector::iterator i = conf.nodes.begin ();	717	for (configuration::node_vector::iterator i = conf.nodes.begin ();
624	i != conf.nodes.end (); ++i)	718	i != conf.nodes.end (); ++i)
625	{	719	{
626	connection *conn = new connection (this);	720	connection conn = new connection (this, i);
627
628	conn->conf = *i;
629	conns.push_back (conn);	721	conns.push_back (conn);
630
631	conn->establish_connection ();	722	conn->establish_connection ();
632	}	723	}
633	}	724	}
634		725
635	connection *vpn::find_router ()	726	connection *vpn::find_router ()
636	{	727	{
637	u32 prio = 0;	728	u32 prio = 1;
638	connection *router = 0;	729	connection *router = 0;
639		730
640	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641	{	732	{
642	connection c = i;	733	connection c = i;
643		734
644	if (c->conf->routerprio > prio	735	if (c->conf->routerprio > prio
645	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	736	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646	&& c->ictx && c->octx	737	&& c->ictx && c->octx
647	&& c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode	738	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648	&& (!THISNODE->routerprio
649	\|\| c->conf->routerprio <= THISNODE->routerprio))
650	{	739	{
651	prio = c->conf->routerprio;	740	prio = c->conf->routerprio;
652	router = c;	741	router = c;
653	}	742	}
654	}	743	}
…		…
663	if (c)	752	if (c)
664	c->send_connect_request (id);	753	c->send_connect_request (id);
665	else	754	else
666	// no router found, aggressively connect to all routers	755	// no router found, aggressively connect to all routers
667	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	756	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668	if ((*i)->conf->routerprio)	757	if ((i)->conf->routerprio && (i)->conf != THISNODE)
669	(*i)->establish_connection ();	758	(*i)->establish_connection ();
670	}	759	}
671		760
672	void	761	void
673	connection::dump_status ()	762	connection::dump_status ()
…		…
682	}	771	}
683		772
684	void	773	void
685	vpn::dump_status ()	774	vpn::dump_status ()
686	{	775	{
687	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	776	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
688		777
689	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	778	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
690	(*c)->dump_status ();	779	(*c)->dump_status ();
691		780
692	slog (L_NOTICE, _("END status dump"));	781	slog (L_NOTICE, _("END status dump"));
693	}	782	}
694		783
695	vpn::vpn (void)	784	vpn::vpn (void)
		785	{
696	: event (this, &vpn::event_cb)	786	event .set<vpn, &vpn::event_cb > (this);
697	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	787	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
698	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	788	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
699	#if ENABLE_TCP	789	#if ENABLE_TCP
700	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	790	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
701	#endif	791	#endif
702	#if ENABLE_ICMP	792	#if ENABLE_ICMP
703	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	793	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
704	#endif	794	#endif
705	, tap_ev_watcher (this, &vpn::tap_ev)	795	#if ENABLE_DNS
706	{	796	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		797	#endif
		798	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
707	}	799	}
708		800
709	vpn::~vpn ()	801	vpn::~vpn ()
710	{	802	{
711	}	803	}

Diff Legend

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

Comparing gvpe/src/vpn.C (file contents): Revision 1.11 by pcg, Sun Apr 13 00:35:46 2003 UTC vs. Revision 1.44 by pcg, Tue Dec 4 17:17:20 2007 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.11 by pcg, Sun Apr 13 00:35:46 2003 UTC vs.
Revision 1.44 by pcg, Tue Dec 4 17:17:20 2007 UTC