[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 1.58 by root, Tue Feb 15 13:31:23 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/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	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;
90	}	145	}
91		146
92	int	147	int
93	vpn::setup ()	148	vpn::setup ()
94	{	149	{
		150	int success = 0;
		151
		152	ipv4_tos = -1;
95	ipv4_fd = -1;	153	ipv4_fd = -1;
96		154
97	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
98	{	156	{
99	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
100		158
101	if (ipv4_fd < 0)	159	if (ipv4_fd < 0)
102	return -1;	160	return -1;
103
104	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
105		161
106	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
107	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
108	// 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
109	// fragment for me sometimes.	165	// fragment for me sometimes.
115		171
116	sockinfo si (THISNODE, PROT_IPv4);	172	sockinfo si (THISNODE, PROT_IPv4);
117		173
118	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
119	{	175	{
120	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));
121	exit (1);	177	return -1;
122	}	178	}
123		179
124	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
125	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
126		185
		186	udpv4_tos = -1;
127	udpv4_fd = -1;	187	udpv4_fd = -1;
128		188
129	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
130	{	190	{
131	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
132		192
133	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
134	return -1;	194	return -1;
135
136	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
137		195
138	// standard daemon practise...	196	// standard daemon practise...
139	{	197	{
140	int oval = 1;	198	int oval = 1;
141	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
153		211
154	sockinfo si (THISNODE, PROT_UDPv4);	212	sockinfo si (THISNODE, PROT_UDPv4);
155		213
156	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
157	{	215	{
158	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));
159	exit (1);	217	return -1;
160	}	218	}
161		219
162	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
163	}	222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
164		225
		226	icmpv4_tos = -1;
165	icmpv4_fd = -1;	227	icmpv4_fd = -1;
166		228
167	#if ENABLE_ICMP	229	#if ENABLE_ICMP
168	if (THISNODE->protocols & PROT_ICMPv4)	230	if (THISNODE->protocols & PROT_ICMPv4)
169	{	231	{
170	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
171		233
172	if (icmpv4_fd < 0)	234	if (icmpv4_fd < 0)
173	return -1;	235	return -1;
174
175	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
176		236
177	#ifdef ICMP_FILTER	237	#ifdef ICMP_FILTER
178	{	238	{
179	icmp_filter oval;	239	icmp_filter oval;
180	oval.data = 0xffffffff;	240	oval.data = 0xffffffff;
…		…
189	// this I really consider a linux bug. I am neither connected	249	// this I really consider a linux bug. I am neither connected
190	// 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
191	// fragment for me sometimes.	251	// fragment for me sometimes.
192	{	252	{
193	int oval = IP_PMTUDISC_DONT;	253	int oval = IP_PMTUDISC_DONT;
194	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
195	}	255	}
196	#endif	256	#endif
197		257
198	sockinfo si (THISNODE, PROT_ICMPv4);	258	sockinfo si (THISNODE, PROT_ICMPv4);
199		259
200	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
201	{	261	{
202	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));
203	exit (1);	263	return -1;
204	}	264	}
205		265
206	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
207	}	268	}
208	#endif	269	#endif
209		270
210	tcpv4_fd = -1;	271	tcpv4_fd = -1;
211		272
212	#if ENABLE_TCP	273	#if ENABLE_TCP
213	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
214	{	275	{
215	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
216		277
217	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
218	return -1;	279	return -1;
219
220	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
221		280
222	// standard daemon practise...	281	// standard daemon practise...
223	{	282	{
224	int oval = 1;	283	int oval = 1;
225	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	284	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
227		286
228	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
229		288
230	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
231	{	290	{
232	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));
233	exit (1);	292	return -1;
234	}	293	}
235		294
236	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
237	{	296	{
238	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));
239	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);
240	}	328	}
241
242	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
243	}
244	#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	/////////////////////////////////////////////////////////////////////////////
245		363
246	tap = new tap_device ();	364	tap = new tap_device ();
247	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
248	{	366	{
249	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
250	exit (1);	368	return -1;
251	}	369	}
252		370
253	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
254		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
255	tap_ev_watcher.start (tap->fd, POLLIN);	391	tap_ev_watcher.start (tap->fd, EV_READ);
256
257	reconnect_all ();
258		392
259	return 0;	393	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	}	394	}
289		395
290	bool	396	bool
291	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)
292	{	398	{
293	#if defined(SOL_IP) && defined(IP_TOS)	399	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 ());	400	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
297		401
298	return true;	402	return true;
299	}	403	}
300		404
…		…
320		424
321	return ~sum;	425	return ~sum;
322	}	426	}
323		427
324	#if ENABLE_ICMP	428	#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	429	bool
343	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)
344	{	431	{
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);	432	pkt->unshift_hdr (4);
350		433
351	icmp_header hdr = (icmp_header )&((*pkt)[0]);	434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
352	hdr->type = ::conf.icmp_type;	435	hdr->type = ::conf.icmp_type;
353	hdr->code = 255;	436	hdr->code = 255;
354	hdr->checksum = 0;	437	hdr->checksum = 0;
355	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
356		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
357	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 ());
358		442
359	return true;	443	return true;
360	}	444	}
361	#endif	445	#endif
362		446
363	bool	447	bool
364	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)
365	{	449	{
366	#if defined(SOL_IP) && defined(IP_TOS)	450	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 ());	451	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
370		452
371	return true;	453	return true;
		454	}
		455
		456	void
		457	vpn::inject_data_packet (tap_packet *pkt, int dst)
		458	{
		459	if (dst)
		460	{
		461	// unicast
		462	if (dst != THISNODE->id)
		463	conns[dst - 1]->inject_data_packet (pkt);
		464	}
		465	else
		466	{
		467	// broadcast, this is ugly, but due to the security policy
		468	// we have to connect to all hosts...
		469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		470	if ((*c)->conf != THISNODE)
		471	(*c)->inject_data_packet (pkt);
		472	}
372	}	473	}
373		474
374	void	475	void
375	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
376	{	477	{
377	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
378	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
379		480
380	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."),
381	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
382		483
383	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
384	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
385	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
386	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)."),
387	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
388	else if (dst > conns.size ())	489	else if (dst > conns.size ())
389	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)."),
390	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
391	else	492	else
392	{	493	{
393	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
394		495
395	if (dst == 0)	496	if (dst == 0)
396	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
397	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
398	else if (dst != 0 && dst != THISNODE->id)	499	else if (dst != THISNODE->id)
399	{	500	{
400	if (THISNODE->routerprio)	501	if (THISNODE->routerprio)
401	// the tos setting gets lost here. who cares.	502	// the tos setting gets lost here. who cares.
402	conns[dst - 1]->inject_vpn_packet (pkt);	503	conns[dst - 1]->inject_vpn_packet (pkt);
403	else	504	else
404	slog (L_WARN,	505	slog (L_WARN,
405	_("%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?)."),
406	c->conf->nodename, (const char *)rsi,	507	c->conf->nodename, (const char *)rsi,
407	conns[dst - 1]->conf->nodename);	508	conns[dst - 1]->conf->nodename);
408	}	509	}
409	else	510	else
410	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
411	}	512	}
412	}	513	}
413		514
414	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
415	vpn::ipv4_ev (io_watcher &w, short revents)	546	vpn::ipv4_ev (ev::io &w, int revents)
416	{	547	{
417	if (revents & (POLLIN \| POLLERR))	548	if (revents & EV_READ)
418	{	549	{
419	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
420	struct sockaddr_in sa;	551	struct sockaddr_in sa;
421	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
422	int len;	553	int len;
…		…
427		558
428	if (len > 0)	559	if (len > 0)
429	{	560	{
430	pkt->len = len;	561	pkt->len = len;
431		562
432	// 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
433	// this is slow, but...
434	pkt->skip_hdr (IP_OVERHEAD);	564	pkt->skip_hdr (IP_OVERHEAD);
435		565
436	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
437	}	567	}
438	else	568	else
439	{	569	{
440	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
441	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	571	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
442	}	572	}
443		573
444	delete pkt;	574	delete pkt;
445	}	575	}
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	576	else
453	{	577	{
454	slog (L_ERR,	578	slog (L_ERR,
455	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
456	revents);	580	revents);
457	exit (1);	581	exit (EXIT_FAILURE);
458	}	582	}
459	}	583	}
460		584
461	#if ENABLE_ICMP	585	#if ENABLE_ICMP
462	void	586	inline void
463	vpn::icmpv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
464	{	588	{
465	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
466	{	590	{
467	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
468	struct sockaddr_in sa;	592	struct sockaddr_in sa;
469	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
470	int len;	594	int len;
…		…
490	}	614	}
491	}	615	}
492	else	616	else
493	{	617	{
494	// probably ECONNRESET or somesuch	618	// probably ECONNRESET or somesuch
495	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	619	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
496	}	620	}
497		621
498	delete pkt;	622	delete pkt;
499	}	623	}
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	624	else
507	{	625	{
508	slog (L_ERR,	626	slog (L_ERR,
509	_("FATAL: unknown revents %08x in socket, terminating\n"),	627	_("FATAL: unknown revents %08x in socket, exiting.\n"),
510	revents);	628	revents);
511	exit (1);	629	exit (EXIT_FAILURE);
512	}	630	}
513	}	631	}
514	#endif	632	#endif
515		633
516	void	634	inline void
517	vpn::udpv4_ev (io_watcher &w, short revents)	635	vpn::udpv4_ev (ev::io &w, int revents)
518	{	636	{
519	if (revents & (POLLIN \| POLLERR))	637	if (revents & EV_READ)
520	{	638	{
521	vpn_packet *pkt = new vpn_packet;	639	vpn_packet *pkt = new vpn_packet;
522	struct sockaddr_in sa;	640	struct sockaddr_in sa;
523	socklen_t sa_len = sizeof (sa);	641	socklen_t sa_len = sizeof (sa);
524	int len;	642	int len;
…		…
534	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
535	}	653	}
536	else	654	else
537	{	655	{
538	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
539	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));
540	}	658	}
541		659
542	delete pkt;	660	delete pkt;
543	}	661	}
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	662	else
551	{	663	{
552	slog (L_ERR,	664	slog (L_ERR,
553	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
554	revents);	666	revents);
555	exit (1);	667	exit (EXIT_FAILURE);
556	}	668	}
557	}	669	}
558		670
559	void	671	inline void
560	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
561	{	673	{
562	if (revents & POLLIN)	674	if (revents & EV_READ)
563	{	675	{
564	/* process data */	676	/* process data */
565	tap_packet *pkt;	677	tap_packet *pkt;
566		678
567	pkt = tap->recv ();	679	pkt = tap->recv ();
568		680
		681	if (!pkt)
		682	return;
		683
		684	if (pkt->len > 14)
		685	{
569	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
570	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
571		688
572	if (src != THISNODE->id)	689	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	{	690	{
590	// unicast	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
591	if (dst != THISNODE->id)	692	exit (EXIT_FAILURE);
592	conns[dst - 1]->inject_data_packet (pkt);
593	}	693	}
		694
		695	if (dst == THISNODE->id)
		696	{
		697	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		698	exit (EXIT_FAILURE);
		699	}
		700
		701	if (dst > conns.size ())
		702	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
594	else	703	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);	704	inject_data_packet (pkt, dst);
601	}
602	}	705	}
603		706
604	delete pkt;	707	delete pkt;
605	}
606	else if (revents & (POLLHUP \| POLLERR))
607	{
608	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
609	exit (1);
610	}	708	}
611	else	709	else
612	abort ();	710	abort ();
613	}	711	}
614		712
615	void	713	inline void
616	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
617	{	715	{
618	if (events)	716	if (events)
619	{	717	{
620	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
621	{	719	{
622	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
623		721
624	shutdown_all ();	722	shutdown_all ();
625
626	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
627
628	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
629		725	exit (EXIT_SUCCESS);
630	exit (0);
631	}	726	}
632		727
633	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
634	{	729	{
635	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
636		731
637	reconnect_all ();	732	reconnect_all ();
638	}	733	}
639		734
640	events = 0;	735	events = 0;
641	}	736	}
642
643	w.at = TSTAMP_CANCEL;
644	}	737	}
645		738
646	void	739	void
647	vpn::shutdown_all ()	740	vpn::shutdown_all ()
648	{	741	{
…		…
658		751
659	conns.clear ();	752	conns.clear ();
660		753
661	connection_init ();	754	connection_init ();
662		755
663	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
664	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
665	{
666	connection *conn = new connection (this);
667		758
668	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
669	conns.push_back (conn);
670
671	conn->establish_connection ();	760	(*c)->establish_connection ();
672	}
673	}	761	}
674		762
675	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
676	{	765	{
677	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	{
678	connection *router = 0;	778	connection *router = 0;
679		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	{
680	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
681	{	829	{
682	connection c = i;	830	connection o = i;
683		831
684	if (c->conf->routerprio > prio	832	if (!o->is_direct
685	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use	833	&& o->si.valid ()
686	&& c->ictx && c->octx	834	&& c->si != o->si
687	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode	835	&& c == find_router_for (o))
688	{
689	prio = c->conf->routerprio;
690	router = c;
691	}	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	}
692	}	841	}
693
694	return router;
695	}	842	}
696		843
		844	void
697	void vpn::send_connect_request (int id)	845	vpn::send_connect_request (connection *c)
698	{	846	{
699	connection *c = find_router ();	847	connection *r = find_router_for (c);
700		848
701	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);
702	c->send_connect_request (id);	853	r->send_connect_request (c->conf->id);
		854	}
703	else	855	else
704	// 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."),
705	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	857	c->conf->nodename);
706	if ((i)->conf->routerprio && (i)->conf != THISNODE)
707	(*i)->establish_connection ();
708	}	858	}
709		859
710	void	860	void
711	connection::dump_status ()	861	connection::dump_status ()
712	{	862	{
713	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
714	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
715	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
716	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"),
717	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(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	}	868	}
721		869
722	void	870	void
723	vpn::dump_status ()	871	vpn::dump_status ()
724	{	872	{
725	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
726		874
727	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
728	(*c)->dump_status ();	876	(*c)->dump_status ();
729		877
730	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
731	}	879	}
732		880
733	vpn::vpn (void)	881	vpn::vpn (void)
		882	{
734	: event (this, &vpn::event_cb)	883	event .set<vpn, &vpn::event_cb > (this);
735	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
736	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
737	#if ENABLE_TCP	886	#if ENABLE_TCP
738	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
739	#endif	888	#endif
740	#if ENABLE_ICMP	889	#if ENABLE_ICMP
741	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	890	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
742	#endif	891	#endif
743	, tap_ev_watcher (this, &vpn::tap_ev)	892	#if ENABLE_DNS
744	{	893	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		894	#endif
		895	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
745	}	896	}
746		897
747	vpn::~vpn ()	898	vpn::~vpn ()
748	{	899	{
749	}	900	}

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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 1.58 by root, Tue Feb 15 13:31:23 2011 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 1.58 by root, Tue Feb 15 13:31:23 2011 UTC