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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 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 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/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <errno.h>	43	#include <errno.h>
32	#include <time.h>	44	#include <time.h>
33	#include <unistd.h>	45	#include <unistd.h>
34	#include <fcntl.h>	46	#include <fcntl.h>
35	#include <sys/socket.h>	47	#include <sys/socket.h>
36	#include <netinet/in.h>	48
37	#include <arpa/inet.h>	49	#include "netcompat.h"
38	#include <net/if.h>
39	#ifdef HAVE_NETINET_IN_SYSTM_H
40	# include <netinet/in_systm.h>
41	#endif
42	#ifdef HAVE_NETINET_IP_H
43	# include <netinet/ip.h>
44	#endif
45	#ifdef HAVE_NETINET_TCP_H
46	# include <netinet/tcp.h>
47	#endif
48	#if ENABLE_ICMP
49	# include <netinet/ip_icmp.h>
50	#endif
51		50
52	#include "pidfile.h"	51	#include "pidfile.h"
53		52
54	#include "connection.h"	53	#include "connection.h"
55	#include "util.h"	54	#include "util.h"
56	#include "vpn.h"	55	#include "vpn.h"
57		56
58	#if !defined(SOL_IP) && defined(IPPROTO_IP)	57	vpn network; // THE vpn (bad design...)
59	# define SOL_IP IPPROTO_IP
60	#endif
61		58
62	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
63		60
64	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 ()
65	{	75	{
66	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
67	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
72		82
73	char *env;	83	char *env;
74	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
75	putenv (env);
76	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
77	putenv (env);
78	asprintf (&env, "NODEID=%d", THISNODE->id);
79	putenv (env);
80	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
81	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
82	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
83	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
84	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
85	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
86	THISNODE->id & 0xff);
87	putenv (env);
88		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,
89	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	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
90	}	144	}
91		145
92	int	146	int
93	vpn::setup ()	147	vpn::setup ()
94	{	148	{
		149	int success = 0;
		150
		151	ipv4_tos = -1;
95	ipv4_fd = -1;	152	ipv4_fd = -1;
96		153
97	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
98	{	155	{
99	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
100		157
101	if (ipv4_fd < 0)	158	if (ipv4_fd < 0)
102	return -1;	159	return -1;
103
104	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
105		160
106	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	161	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
107	// this I really consider a linux bug. I am neither connected	162	// this I really consider a linux bug. I am neither connected
108	// nor do I fragment myself. Linux still sets DF and doesn't	163	// nor do I fragment myself. Linux still sets DF and doesn't
109	// fragment for me sometimes.	164	// fragment for me sometimes.
115		170
116	sockinfo si (THISNODE, PROT_IPv4);	171	sockinfo si (THISNODE, PROT_IPv4);
117		172
118	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
119	{	174	{
120	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	175	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
121	exit (1);	176	return -1;
122	}	177	}
123		178
124	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
125	}	181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
126		184
		185	udpv4_tos = -1;
127	udpv4_fd = -1;	186	udpv4_fd = -1;
128		187
129	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
130	{	189	{
131	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
132		191
133	if (udpv4_fd < 0)	192	if (udpv4_fd < 0)
134	return -1;	193	return -1;
135
136	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
137		194
138	// standard daemon practise...	195	// standard daemon practise...
139	{	196	{
140	int oval = 1;	197	int oval = 1;
141	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
153		210
154	sockinfo si (THISNODE, PROT_UDPv4);	211	sockinfo si (THISNODE, PROT_UDPv4);
155		212
156	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
157	{	214	{
158	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	215	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
159	exit (1);	216	return -1;
160	}	217	}
161		218
162	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
163	}	221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
164		224
		225	icmpv4_tos = -1;
165	icmpv4_fd = -1;	226	icmpv4_fd = -1;
166		227
167	#if ENABLE_ICMP	228	#if ENABLE_ICMP
168	if (THISNODE->protocols & PROT_ICMPv4)	229	if (THISNODE->protocols & PROT_ICMPv4)
169	{	230	{
170	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
171		232
172	if (icmpv4_fd < 0)	233	if (icmpv4_fd < 0)
173	return -1;	234	return -1;
174
175	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
176		235
177	#ifdef ICMP_FILTER	236	#ifdef ICMP_FILTER
178	{	237	{
179	icmp_filter oval;	238	icmp_filter oval;
180	oval.data = 0xffffffff;	239	oval.data = 0xffffffff;
…		…
189	// this I really consider a linux bug. I am neither connected	248	// this I really consider a linux bug. I am neither connected
190	// nor do I fragment myself. Linux still sets DF and doesn't	249	// nor do I fragment myself. Linux still sets DF and doesn't
191	// fragment for me sometimes.	250	// fragment for me sometimes.
192	{	251	{
193	int oval = IP_PMTUDISC_DONT;	252	int oval = IP_PMTUDISC_DONT;
194	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
195	}	254	}
196	#endif	255	#endif
197		256
198	sockinfo si (THISNODE, PROT_ICMPv4);	257	sockinfo si (THISNODE, PROT_ICMPv4);
199		258
200	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
201	{	260	{
202	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	261	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
203	exit (1);	262	return -1;
204	}	263	}
205		264
206	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
207	}	267	}
208	#endif	268	#endif
209		269
210	tcpv4_fd = -1;	270	tcpv4_fd = -1;
211		271
212	#if ENABLE_TCP	272	#if ENABLE_TCP
213	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
214	{	274	{
215	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
216		276
217	if (tcpv4_fd < 0)	277	if (tcpv4_fd < 0)
218	return -1;	278	return -1;
219		279
220	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
221
222	// standard daemon practise...	280	// standard daemon practise...
223	{	281	{
224	int oval = 1;	282	int oval = 1;
225	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	283	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
226	}	284	}
227		285
228	sockinfo si (THISNODE, PROT_TCPv4);	286	sockinfo si (THISNODE, PROT_TCPv4);
229		287
230	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
231	{	289	{
232	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	290	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
233	exit (1);	291	return -1;
234	}	292	}
235		293
236	if (listen (tcpv4_fd, 5))	294	if (listen (tcpv4_fd, 5))
237	{	295	{
238	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	296	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
239	exit (1);	297	return -1;
		298	}
		299
		300	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		301	++success;
		302	}
		303	else
		304	THISNODE->protocols &= ~PROT_TCPv4;
		305	#endif
		306
		307	dnsv4_tos = -1;
		308	dnsv4_fd = -1;
		309
		310	#if ENABLE_DNS
		311	if (THISNODE->protocols & PROT_DNSv4)
		312	{
		313	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		314
		315	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		316
		317	if (dnsv4_fd < 0)
		318	return -1;
		319
		320	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		321	// this I really consider a linux bug. I am neither connected
		322	// nor do I fragment myself. Linux still sets DF and doesn't
		323	// fragment for me sometimes.
		324	{
		325	int oval = IP_PMTUDISC_DONT;
		326	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
240	}	327	}
241
242	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
243	}
244	#endif	328	# endif
		329
		330	// standard daemon practise...
		331	{
		332	int oval = 1;
		333	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		334	}
		335
		336	sockinfo si (THISNODE->dns_hostname,
		337	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		338	PROT_DNSv4);
		339
		340	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		341	{
		342	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		343	return -1;
		344	}
		345
		346	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		347	++success;
		348	}
		349	#endif
		350
		351	/////////////////////////////////////////////////////////////////////////////
		352
		353	if (!success)
		354	{
		355	slog (L_ERR, _("no protocols enabled."));
		356	return -1;
		357	}
		358
		359	reconnect_all ();
		360
		361	/////////////////////////////////////////////////////////////////////////////
245		362
246	tap = new tap_device ();	363	tap = new tap_device ();
247	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
248	{	365	{
249	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
250	exit (1);	367	return -1;
251	}	368	}
252		369
253	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
254		371
		372	run_script_cb cb;
		373	cb.set<vpn, &vpn::script_if_init> (this);
		374
		375	if (tap->if_up () &&
		376	!run_script (cb, true))
		377	{
		378	slog (L_ERR, _("interface initialization command '%s' failed."),
		379	tap->if_up ());
		380	return -1;
		381	}
		382
		383	cb.set<vpn, &vpn::script_if_up> (this);
		384	if (!run_script (cb, true))
		385	{
		386	slog (L_ERR, _("if-up command execution failed."));
		387	return -1;
		388	}
		389
255	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
256
257	reconnect_all ();
258		391
259	return 0;	392	return 0;
260	}
261
262	// send a vpn packet out to other hosts
263	bool
264	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
265	{
266	switch (si.prot)
267	{
268	case PROT_IPv4:
269	return send_ipv4_packet (pkt, si, tos);
270
271	case PROT_UDPv4:
272	return send_udpv4_packet (pkt, si, tos);
273
274	#if ENABLE_TCP
275	case PROT_TCPv4:
276	return send_tcpv4_packet (pkt, si, tos);
277	#endif
278
279	#if ENABLE_ICMP
280	case PROT_ICMPv4:
281	return send_icmpv4_packet (pkt, si, tos);
282	#endif
283
284	default:
285	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
286	return false;
287	}
288	}	393	}
289		394
290	bool	395	bool
291	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	396	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
292	{	397	{
293	#if defined(SOL_IP) && defined(IP_TOS)	398	set_tos (ipv4_fd, ipv4_tos, tos);
294	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
295	#endif
296	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
297		400
298	return true;	401	return true;
299	}	402	}
300		403
…		…
320		423
321	return ~sum;	424	return ~sum;
322	}	425	}
323		426
324	#if ENABLE_ICMP	427	#if ENABLE_ICMP
325	struct icmp_header {
326	u8 type;
327	u8 code;
328	u16 checksum;
329	union {
330	struct {
331	u16 id;
332	u16 sequence;
333	} echo;
334	u32 gateway;
335	struct {
336	u16 unused;
337	u16 mtu;
338	} frag;
339	} un;
340	};
341
342	bool	428	bool
343	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	429	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
344	{	430	{
345	#if defined(SOL_IP) && defined(IP_TOS)
346	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
347	#endif
348
349	pkt->unshift_hdr (4);	431	pkt->unshift_hdr (4);
350		432
351	icmp_header hdr = (icmp_header )&((*pkt)[0]);	433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
352	hdr->type = ::conf.icmp_type;	434	hdr->type = ::conf.icmp_type;
353	hdr->code = 255;	435	hdr->code = 255;
354	hdr->checksum = 0;	436	hdr->checksum = 0;
355	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
356		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
357	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	440	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
358		441
359	return true;	442	return true;
360	}	443	}
361	#endif	444	#endif
362		445
363	bool	446	bool
364	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	447	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
365	{	448	{
366	#if defined(SOL_IP) && defined(IP_TOS)	449	set_tos (udpv4_fd, udpv4_tos, tos);
367	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
368	#endif
369	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
370		451
371	return true;	452	return true;
		453	}
		454
		455	void
		456	vpn::inject_data_packet (tap_packet *pkt, int dst)
		457	{
		458	if (dst)
		459	{
		460	// unicast
		461	if (dst != THISNODE->id)
		462	conns[dst - 1]->inject_data_packet (pkt);
		463	}
		464	else
		465	{
		466	// broadcast, this is ugly, but due to the security policy
		467	// we have to connect to all hosts...
		468	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		469	if ((*c)->conf != THISNODE)
		470	(*c)->inject_data_packet (pkt);
		471	}
372	}	472	}
373		473
374	void	474	void
375	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
376	{	476	{
377	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
378	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
379		479
380	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	480	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
381	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
382		482
383	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
384	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
385	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
386	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	486	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
387	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
388	else if (dst > conns.size ())	488	else if (dst > conns.size ())
389	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	489	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
390	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
391	else	491	else
392	{	492	{
393	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
394		494
395	if (dst == 0)	495	if (dst == 0)
396	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
397	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
398	else if (dst != 0 && dst != THISNODE->id)	498	else if (dst != THISNODE->id)
399	{	499	{
400	if (THISNODE->routerprio)	500	if (THISNODE->routerprio)
401	// the tos setting gets lost here. who cares.	501	// the tos setting gets lost here. who cares.
402	conns[dst - 1]->inject_vpn_packet (pkt);	502	conns[dst - 1]->inject_vpn_packet (pkt);
403	else	503	else
404	slog (L_WARN,	504	slog (L_WARN,
405	_("%s(%s): forwarding request (=> %s), but we are no router"),	505	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
406	c->conf->nodename, (const char *)rsi,	506	c->conf->nodename, (const char *)rsi,
407	conns[dst - 1]->conf->nodename);	507	conns[dst - 1]->conf->nodename);
408	}	508	}
409	else	509	else
410	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
411	}	511	}
412	}	512	}
413		513
414	void	514	bool
		515	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		516	{
		517	switch (si.prot)
		518	{
		519	case PROT_IPv4:
		520	return send_ipv4_packet (pkt, si, tos);
		521
		522	case PROT_UDPv4:
		523	return send_udpv4_packet (pkt, si, tos);
		524
		525	#if ENABLE_TCP
		526	case PROT_TCPv4:
		527	return send_tcpv4_packet (pkt, si, tos);
		528	#endif
		529	#if ENABLE_ICMP
		530	case PROT_ICMPv4:
		531	return send_icmpv4_packet (pkt, si, tos);
		532	#endif
		533	#if ENABLE_DNS
		534	case PROT_DNSv4:
		535	return send_dnsv4_packet (pkt, si, tos);
		536	#endif
		537	default:
		538	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		539	}
		540
		541	return false;
		542	}
		543
		544	inline void
415	vpn::ipv4_ev (io_watcher &w, short revents)	545	vpn::ipv4_ev (ev::io &w, int revents)
416	{	546	{
417	if (revents & (POLLIN \| POLLERR))	547	if (revents & EV_READ)
418	{	548	{
419	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
420	struct sockaddr_in sa;	550	struct sockaddr_in sa;
421	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
422	int len;	552	int len;
…		…
427		557
428	if (len > 0)	558	if (len > 0)
429	{	559	{
430	pkt->len = len;	560	pkt->len = len;
431		561
432	// raw sockets deliver the ipv4, but don't expect it on sends	562	// raw sockets deliver the ipv4 header, but don't expect it on sends
433	// this is slow, but...
434	pkt->skip_hdr (IP_OVERHEAD);	563	pkt->skip_hdr (IP_OVERHEAD);
435		564
436	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
437	}	566	}
438	else	567	else
439	{	568	{
440	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
441	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
442	}	571	}
443		572
444	delete pkt;	573	delete pkt;
445	}	574	}
446	else if (revents & POLLHUP)
447	{
448	// this cannot ;) happen on udp sockets
449	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
450	exit (1);
451	}
452	else	575	else
453	{	576	{
454	slog (L_ERR,	577	slog (L_ERR,
455	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
456	revents);	579	revents);
457	exit (1);	580	exit (EXIT_FAILURE);
458	}	581	}
459	}	582	}
460		583
461	#if ENABLE_ICMP	584	#if ENABLE_ICMP
462	void	585	inline void
463	vpn::icmpv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
464	{	587	{
465	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
466	{	589	{
467	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
468	struct sockaddr_in sa;	591	struct sockaddr_in sa;
469	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
470	int len;	593	int len;
…		…
490	}	613	}
491	}	614	}
492	else	615	else
493	{	616	{
494	// probably ECONNRESET or somesuch	617	// probably ECONNRESET or somesuch
495	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	618	slog (L_DEBUG, _("%s: %s."), (const char *)si, 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 icmpv4 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, exiting.\n"),
510	revents);	627	revents);
511	exit (1);	628	exit (EXIT_FAILURE);
512	}	629	}
513	}	630	}
514	#endif	631	#endif
515		632
516	void	633	inline void
517	vpn::udpv4_ev (io_watcher &w, short revents)	634	vpn::udpv4_ev (ev::io &w, int revents)
518	{	635	{
519	if (revents & (POLLIN \| POLLERR))	636	if (revents & EV_READ)
520	{	637	{
521	vpn_packet *pkt = new vpn_packet;	638	vpn_packet *pkt = new vpn_packet;
522	struct sockaddr_in sa;	639	struct sockaddr_in sa;
523	socklen_t sa_len = sizeof (sa);	640	socklen_t sa_len = sizeof (sa);
524	int len;	641	int len;
…		…
534	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
535	}	652	}
536	else	653	else
537	{	654	{
538	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
539	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	656	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
540	}	657	}
541		658
542	delete pkt;	659	delete pkt;
543	}	660	}
544	else if (revents & POLLHUP)
545	{
546	// this cannot ;) happen on udp sockets
547	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
548	exit (1);
549	}
550	else	661	else
551	{	662	{
552	slog (L_ERR,	663	slog (L_ERR,
553	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
554	revents);	665	revents);
555	exit (1);	666	exit (EXIT_FAILURE);
556	}	667	}
557	}	668	}
558		669
559	void	670	inline void
560	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
561	{	672	{
562	if (revents & POLLIN)	673	if (revents & EV_READ)
563	{	674	{
564	/* process data */	675	/* process data */
565	tap_packet *pkt;	676	tap_packet *pkt;
566		677
567	pkt = tap->recv ();	678	pkt = tap->recv ();
568		679
		680	if (!pkt)
		681	return;
		682
		683	if (pkt->len > 14)
		684	{
569	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
570	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
571		687
572	if (src != THISNODE->id)	688	if (src != THISNODE->id)
573	{
574	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
575	exit (1);
576	}
577
578	if (dst == THISNODE->id)
579	{
580	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
581	exit (1);
582	}
583
584	if (dst > conns.size ())
585	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
586	else
587	{
588	if (dst)
589	{	689	{
590	// unicast	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
591	if (dst != THISNODE->id)	691	exit (EXIT_FAILURE);
592	conns[dst - 1]->inject_data_packet (pkt);
593	}	692	}
		693
		694	if (dst == THISNODE->id)
		695	{
		696	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		697	exit (EXIT_FAILURE);
		698	}
		699
		700	if (dst > conns.size ())
		701	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
594	else	702	else
595	{
596	// broadcast, this is ugly, but due to the security policy
597	// we have to connect to all hosts...
598	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
599	if ((*c)->conf != THISNODE)
600	(*c)->inject_data_packet (pkt);	703	inject_data_packet (pkt, dst);
601	}
602	}	704	}
603		705
604	delete pkt;	706	delete pkt;
605	}	707	}
606	else if (revents & (POLLHUP \| POLLERR))
607	{
608	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
609	exit (1);
610	}
611	else	708	else
612	abort ();	709	abort ();
613	}	710	}
614		711
615	void	712	inline void
616	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
617	{	714	{
618	if (events)	715	if (events)
619	{	716	{
620	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
621	{	718	{
622	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
623		720
624	shutdown_all ();	721	shutdown_all ();
625
626	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
627
628	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
629		724	exit (EXIT_SUCCESS);
630	exit (0);
631	}	725	}
632		726
633	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
634	{	728	{
635	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
636		730
637	reconnect_all ();	731	reconnect_all ();
638	}	732	}
639		733
640	events = 0;	734	events = 0;
641	}	735	}
642
643	w.at = TSTAMP_CANCEL;
644	}	736	}
645		737
646	void	738	void
647	vpn::shutdown_all ()	739	vpn::shutdown_all ()
648	{	740	{
…		…
658		750
659	conns.clear ();	751	conns.clear ();
660		752
661	connection_init ();	753	connection_init ();
662		754
663	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
664	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
665	{
666	connection *conn = new connection (this);
667		757
668	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
669	conns.push_back (conn);
670
671	conn->establish_connection ();	759	(*c)->establish_connection ();
672	}
673	}	760	}
674		761
675	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
676	{	763	{
677	u32 prio = 1;	764	return src != dst
		765	&& src->may_direct (dst)
		766	&& dst->may_direct (src)
		767	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		768	\|\| (src->protocols & dst->connectable_protocols ()));
		769	}
		770
		771	// only works for indirect and routed connections: find a router
		772	// from THISNODE to dst
		773	connection vpn::find_router_for (const connection dst)
		774	{
678	connection *router = 0;	775	connection *router = 0;
679		776
		777	// first try to find a router with a direct connection, route there
		778	// regardless of any other considerations.
		779	{
		780	u32 prio = 1;
		781
		782	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		783	{
		784	connection c = i;
		785
		786	if (c->conf->routerprio > prio
		787	&& c->conf != THISNODE
		788	&& can_direct (c->conf, dst->conf)
		789	&& c->ictx && c->octx)
		790	{
		791	prio = c->conf->routerprio;
		792	router = c;
		793	}
		794	}
		795	}
		796
		797	if (router)
		798	return router;
		799
		800	// second try find the router with the highest priority, higher than ours
		801	{
		802	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		803
		804	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		805	{
		806	connection c = i;
		807
		808	if (c->conf->routerprio > prio
		809	&& c != dst
		810	&& c->conf != THISNODE
		811	&& c->ictx && c->octx)
		812	{
		813	prio = c->conf->routerprio;
		814	router = c;
		815	}
		816	}
		817	}
		818
		819	return router;
		820	}
		821
		822	void vpn::connection_established (connection *c)
		823	{
680	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
681	{	825	{
682	connection c = i;	826	connection o = i;
683		827
684	if (c->conf->routerprio > prio	828	if (!o->is_direct
685	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	829	&& o->si.valid ()
686	&& c->ictx && c->octx	830	&& c->si != o->si
687	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	831	&& c == find_router_for (o))
688	{
689	prio = c->conf->routerprio;
690	router = c;
691	}	832	{
		833	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		834	o->conf->nodename, c->conf->nodename);
		835	o->rekey ();
		836	}
692	}	837	}
693
694	return router;
695	}	838	}
696		839
697	void vpn::send_connect_request (int id)	840	void vpn::send_connect_request (connection *c)
698	{	841	{
699	connection *c = find_router ();	842	connection *r = find_router_for (c);
700		843
701	if (c)	844	if (r)
		845	{
		846	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		847	c->conf->nodename, r->conf->nodename);
702	c->send_connect_request (id);	848	r->send_connect_request (c->conf->id);
		849	}
703	else	850	else
704	// no router found, aggressively connect to all routers	851	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
705	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	c->conf->nodename);
706	if ((i)->conf->routerprio && (i)->conf != THISNODE)
707	(*i)->establish_connection ();
708	}	853	}
709		854
710	void	855	void
711	connection::dump_status ()	856	connection::dump_status ()
712	{	857	{
713	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
714	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
715	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
716	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	861	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
717	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
718	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
719	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
720	}	863	}
721		864
722	void	865	void
723	vpn::dump_status ()	866	vpn::dump_status ()
724	{	867	{
725	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
726		869
727	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
728	(*c)->dump_status ();	871	(*c)->dump_status ();
729		872
730	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
731	}	874	}
732		875
733	vpn::vpn (void)	876	vpn::vpn (void)
		877	{
734	: event (this, &vpn::event_cb)	878	event .set<vpn, &vpn::event_cb > (this);
735	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
736	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
737	#if ENABLE_TCP	881	#if ENABLE_TCP
738	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
739	#endif	883	#endif
740	#if ENABLE_ICMP	884	#if ENABLE_ICMP
741	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
742	#endif	886	#endif
743	, tap_ev_watcher (this, &vpn::tap_ev)	887	#if ENABLE_DNS
744	{	888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
745	}	891	}
746		892
747	vpn::~vpn ()	893	vpn::~vpn ()
748	{	894	{
749	}	895	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC vs. Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC