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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.18 by pcg, Thu Oct 16 02:28:36 2003 UTC vs.
Revision 1.60 by root, Fri Sep 16 18:01:27 2011 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008,2010,2011 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 it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	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, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	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 GNU General
12	GNU General Public License for more details.	15	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 along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/wait.h>	42	#include <sys/wait.h>
30	#include <errno.h>	43	#include <errno.h>
39		52
40	#include "connection.h"	53	#include "connection.h"
41	#include "util.h"	54	#include "util.h"
42	#include "vpn.h"	55	#include "vpn.h"
43		56
		57	vpn network; // THE vpn (bad design...)
		58
44	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
45		60
46	const char *vpn::script_if_up ()	61	static void inline
		62	set_tos (int fd, int &tos_prev, int tos)
		63	{
		64	#if defined(SOL_IP) && defined(IP_TOS)
		65	if (tos_prev == tos)
		66	return;
		67
		68	tos_prev = tos;
		69	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		70	#endif
		71	}
		72
		73	void
		74	vpn::script_init_env ()
47	{	75	{
48	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
49	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
50	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		82
55	char *env;	83	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	84	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 ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68	THISNODE->id & 0xff);
69	putenv (env);
70		91
		92	conns [THISNODE->id - 1]->script_init_env ("");
		93
		94	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		95	{
		96	char ext[16];
		97	snprintf (ext, 16, "_%d", (*c)->conf->id);
		98	(*c)->script_init_env (ext);
		99	}
		100	}
		101
		102	inline const char *
		103	vpn::script_if_init ()
		104	{
		105	script_init_env ();
		106
		107	return tap->if_up ();
		108	}
		109
		110	inline const char *
		111	vpn::script_if_up ()
		112	{
		113	script_init_env ();
		114
		115	char *filename;
		116	asprintf (&filename,
		117	"%s/%s",
		118	confbase,
71	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	119	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		120
		121	return filename;
		122	}
		123
		124	int
		125	vpn::setup_socket (u8 prot, int family, int type, int proto)
		126	{
		127	int fd = socket (family, type, proto);
		128
		129	if (fd < 0)
		130	{
		131	slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
		132	return fd;
		133	}
		134
		135	fcntl (fd, F_SETFL, O_NONBLOCK);
		136	fcntl (fd, F_SETFD, FD_CLOEXEC);
		137
		138	#ifdef SO_MARK
		139	if (::conf.nfmark)
		140	if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark))
		141	slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno));
		142	#endif
		143
		144	return fd;
72	}	145	}
73		146
74	int	147	int
75	vpn::setup ()	148	vpn::setup ()
76	{	149	{
		150	int success = 0;
		151
		152	ipv4_tos = -1;
77	ipv4_fd = -1;	153	ipv4_fd = -1;
78		154
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	156	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
82		158
83	if (ipv4_fd < 0)	159	if (ipv4_fd < 0)
84	return -1;	160	return -1;
85
86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
87		161
88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
90	// nor do I fragment myself. Linux still sets DF and doesn't	164	// nor do I fragment myself. Linux still sets DF and doesn't
91	// fragment for me sometimes.	165	// fragment for me sometimes.
…		…
97		171
98	sockinfo si (THISNODE, PROT_IPv4);	172	sockinfo si (THISNODE, PROT_IPv4);
99		173
100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101	{	175	{
102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	176	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
103	exit (1);	177	return -1;
104	}	178	}
105		179
106	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
107	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
108		185
		186	udpv4_tos = -1;
109	udpv4_fd = -1;	187	udpv4_fd = -1;
110		188
111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112	{	190	{
113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114		192
115	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
116	return -1;	194	return -1;
117
118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
119		195
120	// standard daemon practise...	196	// standard daemon practise...
121	{	197	{
122	int oval = 1;	198	int oval = 1;
123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
135		211
136	sockinfo si (THISNODE, PROT_UDPv4);	212	sockinfo si (THISNODE, PROT_UDPv4);
137		213
138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139	{	215	{
140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
141	exit (1);	217	return -1;
142	}	218	}
143		219
144	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
145	}	222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
146		225
		226	icmpv4_tos = -1;
147	icmpv4_fd = -1;	227	icmpv4_fd = -1;
148		228
149	#if ENABLE_ICMP	229	#if ENABLE_ICMP
150	if (THISNODE->protocols & PROT_ICMPv4)	230	if (THISNODE->protocols & PROT_ICMPv4)
151	{	231	{
152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
153		233
154	if (icmpv4_fd < 0)	234	if (icmpv4_fd < 0)
155	return -1;	235	return -1;
156
157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
158		236
159	#ifdef ICMP_FILTER	237	#ifdef ICMP_FILTER
160	{	238	{
161	icmp_filter oval;	239	icmp_filter oval;
162	oval.data = 0xffffffff;	240	oval.data = 0xffffffff;
…		…
171	// this I really consider a linux bug. I am neither connected	249	// this I really consider a linux bug. I am neither connected
172	// nor do I fragment myself. Linux still sets DF and doesn't	250	// nor do I fragment myself. Linux still sets DF and doesn't
173	// fragment for me sometimes.	251	// fragment for me sometimes.
174	{	252	{
175	int oval = IP_PMTUDISC_DONT;	253	int oval = IP_PMTUDISC_DONT;
176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	255	}
178	#endif	256	#endif
179		257
180	sockinfo si (THISNODE, PROT_ICMPv4);	258	sockinfo si (THISNODE, PROT_ICMPv4);
181		259
182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183	{	261	{
184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	262	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
185	exit (1);	263	return -1;
186	}	264	}
187		265
188	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
189	}	268	}
190	#endif	269	#endif
191		270
192	tcpv4_fd = -1;	271	tcpv4_fd = -1;
193		272
194	#if ENABLE_TCP	273	#if ENABLE_TCP
195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
196	{	275	{
197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
198		277
199	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
200	return -1;	279	return -1;
201
202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
203		280
204	// standard daemon practise...	281	// standard daemon practise...
205	{	282	{
206	int oval = 1;	283	int oval = 1;
207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	284	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
209		286
210	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
211		288
212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213	{	290	{
214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	291	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
215	exit (1);	292	return -1;
216	}	293	}
217		294
218	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
219	{	296	{
220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	297	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
221	exit (1);	298	return -1;
		299	}
		300
		301	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		302	++success;
		303	}
		304	else
		305	THISNODE->protocols &= ~PROT_TCPv4;
		306	#endif
		307
		308	dnsv4_tos = -1;
		309	dnsv4_fd = -1;
		310
		311	#if ENABLE_DNS
		312	if (THISNODE->protocols & PROT_DNSv4)
		313	{
		314	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		315
		316	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		317
		318	if (dnsv4_fd < 0)
		319	return -1;
		320
		321	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		322	// this I really consider a linux bug. I am neither connected
		323	// nor do I fragment myself. Linux still sets DF and doesn't
		324	// fragment for me sometimes.
		325	{
		326	int oval = IP_PMTUDISC_DONT;
		327	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
222	}	328	}
223
224	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
225	}
226	#endif	329	# endif
		330
		331	// standard daemon practise...
		332	{
		333	int oval = 1;
		334	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		335	}
		336
		337	sockinfo si (THISNODE->dns_hostname,
		338	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		339	PROT_DNSv4);
		340
		341	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		342	{
		343	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		344	return -1;
		345	}
		346
		347	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		348	++success;
		349	}
		350	#endif
		351
		352	/////////////////////////////////////////////////////////////////////////////
		353
		354	if (!success)
		355	{
		356	slog (L_ERR, _("no protocols enabled."));
		357	return -1;
		358	}
		359
		360	reconnect_all ();
		361
		362	/////////////////////////////////////////////////////////////////////////////
227		363
228	tap = new tap_device ();	364	tap = new tap_device ();
229	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
230	{	366	{
231	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
232	exit (1);	368	return -1;
233	}	369	}
234		370
235	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
236		372
		373	run_script_cb cb;
		374	cb.set<vpn, &vpn::script_if_init> (this);
		375
		376	if (tap->if_up () &&
		377	!run_script (cb, true))
		378	{
		379	slog (L_ERR, _("interface initialization command '%s' failed."),
		380	tap->if_up ());
		381	return -1;
		382	}
		383
		384	cb.set<vpn, &vpn::script_if_up> (this);
		385	if (!run_script (cb, true))
		386	{
		387	slog (L_ERR, _("if-up command execution failed."));
		388	return -1;
		389	}
		390
237	tap_ev_watcher.start (tap->fd, POLLIN);	391	tap_ev_watcher.start (tap->fd, EV_READ);
238
239	reconnect_all ();
240		392
241	return 0;	393	return 0;
242	}
243
244	// send a vpn packet out to other hosts
245	bool
246	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
247	{
248	switch (si.prot)
249	{
250	case PROT_IPv4:
251	return send_ipv4_packet (pkt, si, tos);
252
253	case PROT_UDPv4:
254	return send_udpv4_packet (pkt, si, tos);
255
256	#if ENABLE_TCP
257	case PROT_TCPv4:
258	return send_tcpv4_packet (pkt, si, tos);
259	#endif
260
261	#if ENABLE_ICMP
262	case PROT_ICMPv4:
263	return send_icmpv4_packet (pkt, si, tos);
264	#endif
265
266	default:
267	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
268	return false;
269	}
270	}	394	}
271		395
272	bool	396	bool
273	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	397	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
274	{	398	{
275	#if defined(SOL_IP) && defined(IP_TOS)	399	set_tos (ipv4_fd, ipv4_tos, tos);
276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
277	#endif
278	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	400	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
279		401
280	return true;	402	return true;
281	}	403	}
282		404
…		…
305		427
306	#if ENABLE_ICMP	428	#if ENABLE_ICMP
307	bool	429	bool
308	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	430	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
309	{	431	{
310	#if defined(SOL_IP) && defined(IP_TOS)
311	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
312	#endif
313
314	pkt->unshift_hdr (4);	432	pkt->unshift_hdr (4);
315		433
316	icmp_header hdr = (icmp_header )&((*pkt)[0]);	434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
317	hdr->type = ::conf.icmp_type;	435	hdr->type = ::conf.icmp_type;
318	hdr->code = 255;	436	hdr->code = 255;
319	hdr->checksum = 0;	437	hdr->checksum = 0;
320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
321		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
322	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	441	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
323		442
324	return true;	443	return true;
325	}	444	}
326	#endif	445	#endif
327		446
328	bool	447	bool
329	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	448	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
330	{	449	{
331	#if defined(SOL_IP) && defined(IP_TOS)	450	set_tos (udpv4_fd, udpv4_tos, tos);
332	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333	#endif
334	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	451	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335		452
336	return true;	453	return true;
337	}	454	}
338		455
…		…
349	{	466	{
350	// broadcast, this is ugly, but due to the security policy	467	// broadcast, this is ugly, but due to the security policy
351	// we have to connect to all hosts...	468	// we have to connect to all hosts...
352	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
353	if ((*c)->conf != THISNODE)	470	if ((*c)->conf != THISNODE)
354	(*c)->inject_data_packet (pkt, true);	471	(*c)->inject_data_packet (pkt);
355	}	472	}
356	}	473	}
357		474
358	void	475	void
359	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
360	{	477	{
361	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
362	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
363		480
364	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	481	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
365	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
366		483
367	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
368	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
369	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
370	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	487	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
371	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
372	else if (dst > conns.size ())	489	else if (dst > conns.size ())
373	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	490	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
375	else	492	else
376	{	493	{
377	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
378		495
379	if (dst == 0)	496	if (dst == 0)
380	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
381	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
382	else if (dst != THISNODE->id)	499	else if (dst != THISNODE->id)
383	{	500	{
384	if (THISNODE->routerprio)	501	if (THISNODE->routerprio)
385	// the tos setting gets lost here. who cares.	502	// the tos setting gets lost here. who cares.
386	conns[dst - 1]->inject_vpn_packet (pkt);	503	conns[dst - 1]->inject_vpn_packet (pkt);
387	else	504	else
388	slog (L_WARN,	505	slog (L_WARN,
389	_("%s(%s): forwarding request (=> %s), but we are no router"),	506	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
390	c->conf->nodename, (const char *)rsi,	507	c->conf->nodename, (const char *)rsi,
391	conns[dst - 1]->conf->nodename);	508	conns[dst - 1]->conf->nodename);
392	}	509	}
393	else	510	else
394	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
395	}	512	}
396	}	513	}
397		514
398	void	515	bool
		516	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		517	{
		518	switch (si.prot)
		519	{
		520	case PROT_IPv4:
		521	return send_ipv4_packet (pkt, si, tos);
		522
		523	case PROT_UDPv4:
		524	return send_udpv4_packet (pkt, si, tos);
		525
		526	#if ENABLE_TCP
		527	case PROT_TCPv4:
		528	return send_tcpv4_packet (pkt, si, tos);
		529	#endif
		530	#if ENABLE_ICMP
		531	case PROT_ICMPv4:
		532	return send_icmpv4_packet (pkt, si, tos);
		533	#endif
		534	#if ENABLE_DNS
		535	case PROT_DNSv4:
		536	return send_dnsv4_packet (pkt, si, tos);
		537	#endif
		538	default:
		539	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		540	}
		541
		542	return false;
		543	}
		544
		545	inline void
399	vpn::ipv4_ev (io_watcher &w, short revents)	546	vpn::ipv4_ev (ev::io &w, int revents)
400	{	547	{
401	if (revents & (POLLIN \| POLLERR))	548	if (revents & EV_READ)
402	{	549	{
403	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
404	struct sockaddr_in sa;	551	struct sockaddr_in sa;
405	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
406	int len;	553	int len;
…		…
411		558
412	if (len > 0)	559	if (len > 0)
413	{	560	{
414	pkt->len = len;	561	pkt->len = len;
415		562
416	// raw sockets deliver the ipv4, but don't expect it on sends	563	// raw sockets deliver the ipv4 header, but don't expect it on sends
417	// this is slow, but...	564	pkt->skip_hdr (pkt->ipv4_hdr_len ());
418	pkt->skip_hdr (IP_OVERHEAD);
419		565
420	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
421	}	567	}
422	else	568	else
423	{	569	{
424	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
425	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	571	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
426	}	572	}
427		573
428	delete pkt;	574	delete pkt;
429	}	575	}
430	else if (revents & POLLHUP)
431	{
432	// this cannot ;) happen on udp sockets
433	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
434	exit (1);
435	}
436	else	576	else
437	{	577	{
438	slog (L_ERR,	578	slog (L_ERR,
439	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
440	revents);	580	revents);
441	exit (1);	581	exit (EXIT_FAILURE);
442	}	582	}
443	}	583	}
444		584
445	#if ENABLE_ICMP	585	#if ENABLE_ICMP
446	void	586	inline void
447	vpn::icmpv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
448	{	588	{
449	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
450	{	590	{
451	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
452	struct sockaddr_in sa;	592	struct sockaddr_in sa;
453	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
454	int len;	594	int len;
…		…
466	if (hdr->type == ::conf.icmp_type	606	if (hdr->type == ::conf.icmp_type
467	&& hdr->code == 255)	607	&& hdr->code == 255)
468	{	608	{
469	// raw sockets deliver the ipv4, but don't expect it on sends	609	// raw sockets deliver the ipv4, but don't expect it on sends
470	// this is slow, but...	610	// this is slow, but...
471	pkt->skip_hdr (ICMP_OVERHEAD);	611	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
472		612
473	recv_vpn_packet (pkt, si);	613	recv_vpn_packet (pkt, si);
474	}	614	}
475	}	615	}
476	else	616	else
477	{	617	{
478	// probably ECONNRESET or somesuch	618	// probably ECONNRESET or somesuch
479	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	619	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
480	}	620	}
481		621
482	delete pkt;	622	delete pkt;
483	}	623	}
484	else if (revents & POLLHUP)
485	{
486	// this cannot ;) happen on udp sockets
487	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
488	exit (1);
489	}
490	else	624	else
491	{	625	{
492	slog (L_ERR,	626	slog (L_ERR,
493	_("FATAL: unknown revents %08x in socket, terminating\n"),	627	_("FATAL: unknown revents %08x in socket, exiting.\n"),
494	revents);	628	revents);
495	exit (1);	629	exit (EXIT_FAILURE);
496	}	630	}
497	}	631	}
498	#endif	632	#endif
499		633
500	void	634	inline void
501	vpn::udpv4_ev (io_watcher &w, short revents)	635	vpn::udpv4_ev (ev::io &w, int revents)
502	{	636	{
503	if (revents & (POLLIN \| POLLERR))	637	if (revents & EV_READ)
504	{	638	{
505	vpn_packet *pkt = new vpn_packet;	639	vpn_packet *pkt = new vpn_packet;
506	struct sockaddr_in sa;	640	struct sockaddr_in sa;
507	socklen_t sa_len = sizeof (sa);	641	socklen_t sa_len = sizeof (sa);
508	int len;	642	int len;
…		…
518	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
519	}	653	}
520	else	654	else
521	{	655	{
522	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
523	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	657	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
524	}	658	}
525		659
526	delete pkt;	660	delete pkt;
527	}	661	}
528	else if (revents & POLLHUP)
529	{
530	// this cannot ;) happen on udp sockets
531	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
532	exit (1);
533	}
534	else	662	else
535	{	663	{
536	slog (L_ERR,	664	slog (L_ERR,
537	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
538	revents);	666	revents);
539	exit (1);	667	exit (EXIT_FAILURE);
540	}	668	}
541	}	669	}
542		670
543	void	671	inline void
544	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
545	{	673	{
546	if (revents & POLLIN)	674	if (revents & EV_READ)
547	{	675	{
548	/* process data */	676	/* process data */
549	tap_packet *pkt;	677	tap_packet *pkt;
550		678
551	pkt = tap->recv ();	679	pkt = tap->recv ();
…		…
558	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
559	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
560		688
561	if (src != THISNODE->id)	689	if (src != THISNODE->id)
562	{	690	{
563	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
564	exit (1);	692	exit (EXIT_FAILURE);
565	}	693	}
566		694
567	if (dst == THISNODE->id)	695	if (dst == THISNODE->id)
568	{	696	{
569	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));	697	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
570	exit (1);	698	exit (EXIT_FAILURE);
571	}	699	}
572		700
573	if (dst > conns.size ())	701	if (dst > conns.size ())
574	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);	702	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
575	else	703	else
576	inject_data_packet (pkt, dst);	704	inject_data_packet (pkt, dst);
577	}	705	}
578		706
579	delete pkt;	707	delete pkt;
580	}	708	}
581	else if (revents & (POLLHUP \| POLLERR))
582	{
583	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
584	exit (1);
585	}
586	else	709	else
587	abort ();	710	abort ();
588	}	711	}
589		712
590	void	713	inline void
591	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
592	{	715	{
593	if (events)	716	if (events)
594	{	717	{
595	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
596	{	719	{
597	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
598		721
599	shutdown_all ();	722	shutdown_all ();
600
601	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
602
603	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
604		725	exit (EXIT_SUCCESS);
605	exit (0);
606	}	726	}
607		727
608	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
609	{	729	{
610	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
611		731
612	reconnect_all ();	732	reconnect_all ();
613	}	733	}
614		734
615	events = 0;	735	events = 0;
616	}	736	}
617
618	w.at = TSTAMP_CANCEL;
619	}	737	}
620		738
621	void	739	void
622	vpn::shutdown_all ()	740	vpn::shutdown_all ()
623	{	741	{
…		…
633		751
634	conns.clear ();	752	conns.clear ();
635		753
636	connection_init ();	754	connection_init ();
637		755
638	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
639	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
640	{
641	connection *conn = new connection (this);
642		758
643	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
644	conns.push_back (conn);
645
646	conn->establish_connection ();	760	(*c)->establish_connection ();
647	}
648	}	761	}
649		762
650	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
651	{	765	{
652	u32 prio = 1;	766	return src != dst
		767	&& src->may_direct (dst)
		768	&& dst->may_direct (src)
		769	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		770	\|\| (src->protocols & dst->connectable_protocols ()));
		771	}
		772
		773	// only works for indirect and routed connections: find a router
		774	// from THISNODE to dst
		775	connection *
		776	vpn::find_router_for (const connection *dst)
		777	{
653	connection *router = 0;	778	connection *router = 0;
654		779
		780	// first try to find a router with a direct connection, route there
		781	// regardless of any other considerations.
		782	{
		783	u32 prio = 1;
		784
		785	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		786	{
		787	connection c = i;
		788
		789	if (c->conf->routerprio > prio
		790	&& c->conf != THISNODE
		791	&& can_direct (c->conf, dst->conf)
		792	&& c->ictx && c->octx)
		793	{
		794	prio = c->conf->routerprio;
		795	router = c;
		796	}
		797	}
		798	}
		799
		800	if (router)
		801	return router;
		802
		803	// second try find the router with the highest priority, higher than ours
		804	{
		805	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		806
		807	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		808	{
		809	connection c = i;
		810
		811	if (c->conf->routerprio > prio
		812	&& c != dst
		813	&& c->conf != THISNODE
		814	&& c->ictx && c->octx)
		815	{
		816	prio = c->conf->routerprio;
		817	router = c;
		818	}
		819	}
		820	}
		821
		822	return router;
		823	}
		824
		825	void
		826	vpn::connection_established (connection *c)
		827	{
655	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
656	{	829	{
657	connection c = i;	830	connection o = i;
658		831
659	if (c->conf->routerprio > prio	832	if (!o->is_direct
660	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	833	&& o->si.valid ()
661	&& c->ictx && c->octx	834	&& c->si != o->si
662	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	835	&& c == find_router_for (o))
663	{
664	prio = c->conf->routerprio;
665	router = c;
666	}	836	{
		837	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		838	o->conf->nodename, c->conf->nodename);
		839	o->rekey ();
		840	}
667	}	841	}
668
669	return router;
670	}	842	}
671		843
		844	void
672	void vpn::send_connect_request (int id)	845	vpn::send_connect_request (connection *c)
673	{	846	{
674	connection *c = find_router ();	847	connection *r = find_router_for (c);
675		848
676	if (c)	849	if (r)
		850	{
		851	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		852	c->conf->nodename, r->conf->nodename);
677	c->send_connect_request (id);	853	r->send_connect_request (c->conf->id);
		854	}
678	else	855	else
679	// no router found, aggressively connect to all routers	856	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
680	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	857	c->conf->nodename);
681	if ((i)->conf->routerprio && (i)->conf != THISNODE)
682	(*i)->establish_connection ();
683	}	858	}
684		859
685	void	860	void
686	connection::dump_status ()	861	connection::dump_status ()
687	{	862	{
688	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
689	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
690	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
691	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	866	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
692	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
693	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
694	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
695	}	868	}
696		869
697	void	870	void
698	vpn::dump_status ()	871	vpn::dump_status ()
699	{	872	{
700	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
701		874
702	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
703	(*c)->dump_status ();	876	(*c)->dump_status ();
704		877
705	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
706	}	879	}
707		880
708	vpn::vpn (void)	881	vpn::vpn (void)
		882	{
709	: event (this, &vpn::event_cb)	883	event .set<vpn, &vpn::event_cb > (this);
710	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
711	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
712	#if ENABLE_TCP	886	#if ENABLE_TCP
713	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
714	#endif	888	#endif
715	#if ENABLE_ICMP	889	#if ENABLE_ICMP
716	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	890	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
717	#endif	891	#endif
718	, tap_ev_watcher (this, &vpn::tap_ev)	892	#if ENABLE_DNS
719	{	893	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		894	#endif
		895	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
720	}	896	}
721		897
722	vpn::~vpn ()	898	vpn::~vpn ()
723	{	899	{
724	}	900	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.18 by pcg, Thu Oct 16 02:28:36 2003 UTC vs. Revision 1.60 by root, Fri Sep 16 18:01:27 2011 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.18 by pcg, Thu Oct 16 02:28:36 2003 UTC vs.
Revision 1.60 by root, Fri Sep 16 18:01:27 2011 UTC