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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.54 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 <arpa/inet.h>	46	#include <fcntl.h>
35	#include <netinet/in.h>	47	#include <sys/socket.h>
36	#include <netinet/icmp.h>	48
		49	#include "netcompat.h"
37		50
38	#include "pidfile.h"	51	#include "pidfile.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	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
72	}	144	}
73		145
74	int	146	int
75	vpn::setup ()	147	vpn::setup ()
76	{	148	{
		149	int success = 0;
		150
		151	ipv4_tos = -1;
77	ipv4_fd = -1;	152	ipv4_fd = -1;
78		153
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	155	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
82		157
83	if (ipv4_fd < 0)	158	if (ipv4_fd < 0)
84	return -1;	159	return -1;
85		160
86	#ifdef IP_MTU_DISCOVER	161	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	162	// this I really consider a linux bug. I am neither connected
88	// 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
89	// fragment for me sometimes.	164	// fragment for me sometimes.
90	{	165	{
91	int oval = IP_PMTUDISC_DONT;	166	int oval = IP_PMTUDISC_DONT;
95		170
96	sockinfo si (THISNODE, PROT_IPv4);	171	sockinfo si (THISNODE, PROT_IPv4);
97		172
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	174	{
100	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));
101	exit (1);	176	return -1;
102	}	177	}
103		178
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
105	}	181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
106		184
		185	udpv4_tos = -1;
107	udpv4_fd = -1;	186	udpv4_fd = -1;
108		187
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	189	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		191
113	if (udpv4_fd < 0)	192	if (udpv4_fd < 0)
114	return -1;	193	return -1;
115		194
116	// standard daemon practise...	195	// standard daemon practise...
117	{	196	{
118	int oval = 1;	197	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	199	}
121		200
122	#ifdef IP_MTU_DISCOVER	201	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	202	// this I really consider a linux bug. I am neither connected
124	// nor do I fragment myself. Linux still sets DF and doesn't	203	// nor do I fragment myself. Linux still sets DF and doesn't
125	// fragment for me sometimes.	204	// fragment for me sometimes.
126	{	205	{
127	int oval = IP_PMTUDISC_DONT;	206	int oval = IP_PMTUDISC_DONT;
…		…
131		210
132	sockinfo si (THISNODE, PROT_UDPv4);	211	sockinfo si (THISNODE, PROT_UDPv4);
133		212
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	214	{
136	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));
137	exit (1);	216	return -1;
138	}	217	}
139		218
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
141	}	221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
142		224
		225	icmpv4_tos = -1;
143	icmpv4_fd = -1;	226	icmpv4_fd = -1;
144		227
145	#if ENABLE_ICMP	228	#if ENABLE_ICMP
146	if (THISNODE->protocols & PROT_ICMPv4)	229	if (THISNODE->protocols & PROT_ICMPv4)
147	{	230	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		232
150	if (icmpv4_fd < 0)	233	if (icmpv4_fd < 0)
151	return -1;	234	return -1;
152		235
153	#ifdef ICMP_FILTER	236	#ifdef ICMP_FILTER
…		…
159		242
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	243	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	244	}
162	#endif	245	#endif
163		246
164	#ifdef IP_MTU_DISCOVER	247	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	248	// this I really consider a linux bug. I am neither connected
166	// 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
167	// fragment for me sometimes.	250	// fragment for me sometimes.
168	{	251	{
169	int oval = IP_PMTUDISC_DONT;	252	int oval = IP_PMTUDISC_DONT;
170	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171	}	254	}
172	#endif	255	#endif
173		256
174	sockinfo si (THISNODE, PROT_ICMPv4);	257	sockinfo si (THISNODE, PROT_ICMPv4);
175		258
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	260	{
178	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));
179	exit (1);	262	return -1;
180	}	263	}
181		264
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
183	}	267	}
184	#endif	268	#endif
185		269
186	tcpv4_fd = -1;	270	tcpv4_fd = -1;
187		271
188	#if ENABLE_TCP	272	#if ENABLE_TCP
189	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
190	{	274	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		276
193	if (tcpv4_fd < 0)	277	if (tcpv4_fd < 0)
194	return -1;	278	return -1;
195		279
196	// standard daemon practise...	280	// standard daemon practise...
…		…
201		285
202	sockinfo si (THISNODE, PROT_TCPv4);	286	sockinfo si (THISNODE, PROT_TCPv4);
203		287
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	289	{
206	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));
207	exit (1);	291	return -1;
208	}	292	}
209		293
210	if (listen (tcpv4_fd, 5))	294	if (listen (tcpv4_fd, 5))
211	{	295	{
212	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));
213	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);
214	}	327	}
215
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
217	}
218	#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	/////////////////////////////////////////////////////////////////////////////
219		362
220	tap = new tap_device ();	363	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
222	{	365	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
224	exit (1);	367	return -1;
225	}	368	}
226		369
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
228		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
229	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
230
231	reconnect_all ();
232		391
233	return 0;	392	return 0;
234	}
235
236	// send a vpn packet out to other hosts
237	bool
238	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
239	{
240	switch (si.prot)
241	{
242	case PROT_IPv4:
243	return send_ipv4_packet (pkt, si, tos);
244
245	case PROT_UDPv4:
246	return send_udpv4_packet (pkt, si, tos);
247
248	#if ENABLE_TCP
249	case PROT_TCPv4:
250	return send_tcpv4_packet (pkt, si, tos);
251	#endif
252
253	#if ENABLE_ICMP
254	case PROT_ICMPv4:
255	return send_icmpv4_packet (pkt, si, tos);
256	#endif
257
258	default:
259	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
260	return false;
261	}
262	}	393	}
263		394
264	bool	395	bool
265	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)
266	{	397	{
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	398	set_tos (ipv4_fd, ipv4_tos, tos);
268	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 ());
269		400
270	return true;	401	return true;
271	}	402	}
272		403
…		…
291	sum += (sum >> 16); // carry	422	sum += (sum >> 16); // carry
292		423
293	return ~sum;	424	return ~sum;
294	}	425	}
295		426
		427	#if ENABLE_ICMP
296	bool	428	bool
297	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)
298	{	430	{
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
300
301	pkt->unshift_hdr (4);	431	pkt->unshift_hdr (4);
302		432
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	434	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	435	hdr->code = 255;
306	hdr->checksum = 0;	436	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
309	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 ());
310		441
311	return true;	442	return true;
312	}	443	}
		444	#endif
313		445
314	bool	446	bool
315	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)
316	{	448	{
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	449	set_tos (udpv4_fd, udpv4_tos, tos);
318	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 ());
319		451
320	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	}
321	}	472	}
322		473
323	void	474	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	476	{
326	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
327	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
328		479
329	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."),
330	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
331		482
332	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
333	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
334	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
335	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)."),
336	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
337	else if (dst > conns.size ())	488	else if (dst > conns.size ())
338	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)."),
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	491	else
341	{	492	{
342	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
343		494
344	if (dst == 0 && !THISNODE->routerprio)	495	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
346	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	498	else if (dst != THISNODE->id)
348	{	499	{
349	if (THISNODE->routerprio)	500	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	501	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	502	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	503	else
353	slog (L_WARN,	504	slog (L_WARN,
354	_("%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?)."),
355	c->conf->nodename, (const char *)rsi,	506	c->conf->nodename, (const char *)rsi,
356	conns[dst - 1]->conf->nodename);	507	conns[dst - 1]->conf->nodename);
357	}	508	}
358	else	509	else
359	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
360	}	511	}
361	}	512	}
362		513
363	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
364	vpn::ipv4_ev (io_watcher &w, short revents)	545	vpn::ipv4_ev (ev::io &w, int revents)
365	{	546	{
366	if (revents & (POLLIN \| POLLERR))	547	if (revents & EV_READ)
367	{	548	{
368	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	550	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
371	int len;	552	int len;
…		…
376		557
377	if (len > 0)	558	if (len > 0)
378	{	559	{
379	pkt->len = len;	560	pkt->len = len;
380		561
381	// 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
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	563	pkt->skip_hdr (IP_OVERHEAD);
384		564
385	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
386	}	566	}
387	else	567	else
388	{	568	{
389	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
391	}	571	}
392		572
393	delete pkt;	573	delete pkt;
394	}	574	}
395	else if (revents & POLLHUP)
396	{
397	// this cannot ;) happen on udp sockets
398	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
399	exit (1);
400	}
401	else	575	else
402	{	576	{
403	slog (L_ERR,	577	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
405	revents);	579	revents);
406	exit (1);	580	exit (EXIT_FAILURE);
407	}	581	}
408	}	582	}
409		583
410	void	584	#if ENABLE_ICMP
		585	inline void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
412	{	587	{
413	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
414	{	589	{
415	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	591	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
418	int len;	593	int len;
…		…
423		598
424	if (len > 0)	599	if (len > 0)
425	{	600	{
426	pkt->len = len;	601	pkt->len = len;
427		602
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	603	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		604
430	if (hdr->type == ::conf.icmp_type	605	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	606	&& hdr->code == 255)
432	{	607	{
433	// raw sockets deliver the ipv4, but don't expect it on sends	608	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
438	}	613	}
439	}	614	}
440	else	615	else
441	{	616	{
442	// probably ECONNRESET or somesuch	617	// probably ECONNRESET or somesuch
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	618	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
444	}	619	}
445		620
446	delete pkt;	621	delete pkt;
447	}	622	}
448	else if (revents & POLLHUP)
449	{
450	// this cannot ;) happen on udp sockets
451	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
452	exit (1);
453	}
454	else	623	else
455	{	624	{
456	slog (L_ERR,	625	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	626	_("FATAL: unknown revents %08x in socket, exiting.\n"),
458	revents);	627	revents);
459	exit (1);	628	exit (EXIT_FAILURE);
460	}	629	}
461	}	630	}
		631	#endif
462		632
463	void	633	inline void
464	vpn::udpv4_ev (io_watcher &w, short revents)	634	vpn::udpv4_ev (ev::io &w, int revents)
465	{	635	{
466	if (revents & (POLLIN \| POLLERR))	636	if (revents & EV_READ)
467	{	637	{
468	vpn_packet *pkt = new vpn_packet;	638	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	639	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	640	socklen_t sa_len = sizeof (sa);
471	int len;	641	int len;
…		…
481	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
482	}	652	}
483	else	653	else
484	{	654	{
485	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
486	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));
487	}	657	}
488		658
489	delete pkt;	659	delete pkt;
490	}	660	}
491	else if (revents & POLLHUP)
492	{
493	// this cannot ;) happen on udp sockets
494	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
495	exit (1);
496	}
497	else	661	else
498	{	662	{
499	slog (L_ERR,	663	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
501	revents);	665	revents);
502	exit (1);	666	exit (EXIT_FAILURE);
503	}	667	}
504	}	668	}
505		669
506	void	670	inline void
507	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
508	{	672	{
509	if (revents & POLLIN)	673	if (revents & EV_READ)
510	{	674	{
511	/* process data */	675	/* process data */
512	tap_packet *pkt;	676	tap_packet *pkt;
513		677
514	pkt = tap->recv ();	678	pkt = tap->recv ();
515		679
		680	if (!pkt)
		681	return;
		682
		683	if (pkt->len > 14)
		684	{
516	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
518		687
519	if (src != THISNODE->id)	688	if (src != THISNODE->id)
520	{
521	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
522	exit (1);
523	}
524
525	if (dst == THISNODE->id)
526	{
527	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
528	exit (1);
529	}
530
531	if (dst > conns.size ())
532	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
533	else
534	{
535	if (dst)
536	{	689	{
537	// unicast	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	691	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	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);
541	else	702	else
542	{
543	// broadcast, first check router, then self, then english
544	connection *router = find_router ();
545
546	if (router)
547	router->inject_data_packet (pkt, true);	703	inject_data_packet (pkt, dst);
548	else
549	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
550	if ((*c)->conf != THISNODE)
551	(*c)->inject_data_packet (pkt);
552	}
553	}	704	}
554		705
555	delete pkt;	706	delete pkt;
556	}	707	}
557	else if (revents & (POLLHUP \| POLLERR))
558	{
559	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
560	exit (1);
561	}
562	else	708	else
563	abort ();	709	abort ();
564	}	710	}
565		711
566	void	712	inline void
567	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
568	{	714	{
569	if (events)	715	if (events)
570	{	716	{
571	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
572	{	718	{
573	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
574		720
575	shutdown_all ();	721	shutdown_all ();
576
577	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
580		724	exit (EXIT_SUCCESS);
581	exit (0);
582	}	725	}
583		726
584	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
585	{	728	{
586	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
587		730
588	reconnect_all ();	731	reconnect_all ();
589	}	732	}
590		733
591	events = 0;	734	events = 0;
592	}	735	}
593
594	w.at = TSTAMP_CANCEL;
595	}	736	}
596		737
597	void	738	void
598	vpn::shutdown_all ()	739	vpn::shutdown_all ()
599	{	740	{
…		…
609		750
610	conns.clear ();	751	conns.clear ();
611		752
612	connection_init ();	753	connection_init ();
613		754
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
615	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
616	{
617	connection *conn = new connection (this);
618		757
619	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
620	conns.push_back (conn);
621
622	conn->establish_connection ();	759	(*c)->establish_connection ();
623	}
624	}	760	}
625		761
626	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
627	{	763	{
628	u32 prio = 0;	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	{
629	connection *router = 0;	775	connection *router = 0;
630		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	{
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	825	{
633	connection c = i;	826	connection o = i;
634		827
635	if (c->conf->routerprio > prio	828	if (!o->is_direct
636	&& c->connectmode == conf_node::C_ALWAYS	829	&& o->si.valid ()
637	&& c->conf != THISNODE	830	&& c->si != o->si
638	&& c->ictx && c->octx)	831	&& c == find_router_for (o))
639	{
640	prio = c->conf->routerprio;
641	router = c;
642	}	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	}
643	}	837	}
644
645	return router;
646	}	838	}
647		839
648	void vpn::send_connect_request (int id)	840	void vpn::send_connect_request (connection *c)
649	{	841	{
650	connection *c = find_router ();	842	connection *r = find_router_for (c);
651		843
652	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);
653	c->send_connect_request (id);	848	r->send_connect_request (c->conf->id);
		849	}
654	else	850	else
655	// 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."),
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	c->conf->nodename);
657	if ((*i)->conf->routerprio)
658	(*i)->establish_connection ();
659	}	853	}
660		854
661	void	855	void
662	connection::dump_status ()	856	connection::dump_status ()
663	{	857	{
664	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
665	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
666	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
667	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"),
668	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
669	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
670	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
671	}	863	}
672		864
673	void	865	void
674	vpn::dump_status ()	866	vpn::dump_status ()
675	{	867	{
676	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
677		869
678	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
679	(*c)->dump_status ();	871	(*c)->dump_status ();
680		872
681	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
682	}	874	}
683		875
684	vpn::vpn (void)	876	vpn::vpn (void)
		877	{
685	: event (this, &vpn::event_cb)	878	event .set<vpn, &vpn::event_cb > (this);
686	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
687	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
688	#if ENABLE_TCP	881	#if ENABLE_TCP
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
690	#endif	883	#endif
691	#if ENABLE_ICMP	884	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
693	#endif	886	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	887	#if ENABLE_DNS
695	{	888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
696	}	891	}
697		892
698	vpn::~vpn ()	893	vpn::~vpn ()
699	{	894	{
700	}	895	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs. Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC