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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.53 by pcg, Fri Aug 15 17:50:10 2008 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 <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	43	#include <errno.h>
34	#include <time.h>	44	#include <time.h>
35	#include <unistd.h>	45	#include <unistd.h>
		46	#include <fcntl.h>
		47	#include <sys/socket.h>
		48
		49	#include "netcompat.h"
36		50
37	#include "pidfile.h"	51	#include "pidfile.h"
38		52
39	#include "connection.h"	53	#include "connection.h"
40	#include "util.h"	54	#include "util.h"
41	#include "vpn.h"	55	#include "vpn.h"
42		56
		57	vpn network; // THE vpn (bad design...)
		58
43	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
44		60
45	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 ()
46	{	75	{
47	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		82
54	char *env;	83	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);
68	putenv (env);
69		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,
70	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;
71	}	122	}
72		123
73	int	124	int
74	vpn::setup ()	125	vpn::setup ()
75	{	126	{
		127	int success = 0;
		128
		129	ipv4_tos = -1;
76	udpv4_fd = -1;	130	ipv4_fd = -1;
77		131
78	if (THISNODE->protocols & PROT_UDPv4)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	133	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		135
82	if (udpv4_fd < 0)	136	if (ipv4_fd < 0)
83	return -1;	137	return -1;
84		138
85	// standard daemon practise...	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
86	{	140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
87	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}
90		141
91	sockinfo si (THISNODE, PROT_UDPv4);	142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92
93	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
94	{
95	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
96	exit (1);
97	}
98
99	#ifdef IP_MTU_DISCOVER
100	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	144	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	145	// fragment for me sometimes.
103	{	146	{
104	int oval = IP_PMTUDISC_DONT;	147	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	148	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		149	}
		150	#endif
		151
		152	sockinfo si (THISNODE, PROT_IPv4);
		153
		154	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		155	{
		156	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		157	exit (EXIT_FAILURE);
106	}	158	}
107	#endif
108		159
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
110	}	162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
111		165
		166	udpv4_tos = -1;
112	ipv4_fd = -1;	167	udpv4_fd = -1;
113	if (THISNODE->protocols & PROT_IPv4)
114	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
116		168
		169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		170	{
		171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		172
117	if (ipv4_fd < 0)	173	if (udpv4_fd < 0)
118	return -1;	174	return -1;
119		175
120	sockinfo si (THISNODE, PROT_IPv4);	176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
121		178
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	179	// standard daemon practise...
123	{	180	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	181	int oval = 1;
125	exit (1);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
126	}	183	}
127		184
128	#ifdef IP_MTU_DISCOVER	185	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	186	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	187	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	188	// fragment for me sometimes.
132	{	189	{
133	int oval = IP_PMTUDISC_DONT;	190	int oval = IP_PMTUDISC_DONT;
		191	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		192	}
		193	#endif
		194
		195	sockinfo si (THISNODE, PROT_UDPv4);
		196
		197	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		198	{
		199	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		200	exit (EXIT_FAILURE);
		201	}
		202
		203	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		204	++success;
		205	}
		206	else
		207	THISNODE->protocols &= ~PROT_UDPv4;
		208
		209	icmpv4_tos = -1;
		210	icmpv4_fd = -1;
		211
		212	#if ENABLE_ICMP
		213	if (THISNODE->protocols & PROT_ICMPv4)
		214	{
		215	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		216
		217	if (icmpv4_fd < 0)
		218	return -1;
		219
		220	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		221	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		222
		223	#ifdef ICMP_FILTER
		224	{
		225	icmp_filter oval;
		226	oval.data = 0xffffffff;
		227	if (::conf.icmp_type < 32)
		228	oval.data &= ~(1 << ::conf.icmp_type);
		229
		230	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
		231	}
		232	#endif
		233
		234	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		235	// this I really consider a linux bug. I am neither connected
		236	// nor do I fragment myself. Linux still sets DF and doesn't
		237	// fragment for me sometimes.
		238	{
		239	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	240	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		241	}
		242	#endif
		243
		244	sockinfo si (THISNODE, PROT_ICMPv4);
		245
		246	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		247	{
		248	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		249	exit (EXIT_FAILURE);
135	}	250	}
136	#endif
137		251
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
139	}	254	}
		255	#endif
		256
		257	tcpv4_fd = -1;
140		258
141	#if ENABLE_TCP	259	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	260	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	261	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	262	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		263
146	if (tcpv4_fd < 0)	264	if (tcpv4_fd < 0)
147	return -1;	265	return -1;
148		266
		267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		269
149	// standard daemon practise...	270	// standard daemon practise...
150	{	271	{
151	int oval = 1;	272	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
153	}	274	}
154		275
155	sockinfo si (THISNODE, PROT_TCPv4);	276	sockinfo si (THISNODE, PROT_TCPv4);
156		277
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	279	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	280	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
160	exit (1);	281	exit (EXIT_FAILURE);
161	}	282	}
162		283
163	if (listen (tcpv4_fd, 5))	284	if (listen (tcpv4_fd, 5))
164	{	285	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	286	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
166	exit (1);	287	exit (EXIT_FAILURE);
		288	}
		289
		290	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		291	++success;
		292	}
		293	else
		294	THISNODE->protocols &= ~PROT_TCPv4;
		295	#endif
		296
		297	dnsv4_tos = -1;
		298	dnsv4_fd = -1;
		299
		300	#if ENABLE_DNS
		301	if (THISNODE->protocols & PROT_DNSv4)
		302	{
		303	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		304
		305	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		306
		307	if (dnsv4_fd < 0)
		308	return -1;
		309
		310	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		311	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		312
		313	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		314	// this I really consider a linux bug. I am neither connected
		315	// nor do I fragment myself. Linux still sets DF and doesn't
		316	// fragment for me sometimes.
		317	{
		318	int oval = IP_PMTUDISC_DONT;
		319	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
167	}	320	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#endif	321	# endif
		322
		323	// standard daemon practise...
		324	{
		325	int oval = 1;
		326	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		327	}
		328
		329	sockinfo si (THISNODE->dns_hostname,
		330	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		331	PROT_DNSv4);
		332
		333	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		334	{
		335	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		336	exit (EXIT_FAILURE);
		337	}
		338
		339	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		340	++success;
		341	}
		342	#endif
		343
		344	/////////////////////////////////////////////////////////////////////////////
		345
		346	if (!success)
		347	{
		348	slog (L_ERR, _("no protocols enabled, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
		352	reconnect_all ();
		353
		354	/////////////////////////////////////////////////////////////////////////////
172		355
173	tap = new tap_device ();	356	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
175	{	358	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
177	exit (1);	360	exit (EXIT_FAILURE);
178	}	361	}
179		362
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
181		364
		365	run_script_cb cb;
		366	cb.set<vpn, &vpn::script_if_init> (this);
		367
		368	if (tap->if_up () &&
		369	!run_script (cb, true))
		370	{
		371	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		372	tap->if_up ());
		373	exit (EXIT_FAILURE);
		374	}
		375
		376	cb.set<vpn, &vpn::script_if_up> (this);
		377	if (!run_script (cb, true))
		378	{
		379	slog (L_ERR, _("if-up command execution failed, exiting."));
		380	exit (EXIT_FAILURE);
		381	}
		382
182	tap_ev_watcher.start (tap->fd, POLLIN);	383	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		384
186	return 0;	385	return 0;
187	}
188
189	// send a vpn packet out to other hosts
190	bool
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	return send_ipv4_packet (pkt, si, tos);
197
198	case PROT_UDPv4:
199	return send_udpv4_packet (pkt, si, tos);
200
201	#if ENABLE_TCP
202	case PROT_TCPv4:
203	return send_tcpv4_packet (pkt, si, tos);
204	#endif
205
206	default:
207	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
208	return false;
209	}
210	}	386	}
211		387
212	bool	388	bool
213	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	389	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
214	{	390	{
215	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	391	set_tos (ipv4_fd, ipv4_tos, tos);
216	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	392	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
217		393
218	return true;	394	return true;
219	}	395	}
		396
		397	static u16
		398	ipv4_checksum (u16 *data, unsigned int len)
		399	{
		400	// use 32 bit accumulator and fold back carry bits at the end
		401	u32 sum = 0;
		402
		403	while (len > 1)
		404	{
		405	sum += *data++;
		406	len -= 2;
		407	}
		408
		409	// odd byte left?
		410	if (len)
		411	sum += (u8 )data;
		412
		413	// add back carry bits
		414	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		415	sum += (sum >> 16); // carry
		416
		417	return ~sum;
		418	}
		419
		420	#if ENABLE_ICMP
		421	bool
		422	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		423	{
		424	pkt->unshift_hdr (4);
		425
		426	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		427	hdr->type = ::conf.icmp_type;
		428	hdr->code = 255;
		429	hdr->checksum = 0;
		430	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		431
		432	set_tos (icmpv4_fd, icmpv4_tos, tos);
		433	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		434
		435	return true;
		436	}
		437	#endif
220		438
221	bool	439	bool
222	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	440	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
223	{	441	{
224	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	442	set_tos (udpv4_fd, udpv4_tos, tos);
225	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	443	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
226		444
227	return true;	445	return true;
		446	}
		447
		448	void
		449	vpn::inject_data_packet (tap_packet *pkt, int dst)
		450	{
		451	if (dst)
		452	{
		453	// unicast
		454	if (dst != THISNODE->id)
		455	conns[dst - 1]->inject_data_packet (pkt);
		456	}
		457	else
		458	{
		459	// broadcast, this is ugly, but due to the security policy
		460	// we have to connect to all hosts...
		461	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		462	if ((*c)->conf != THISNODE)
		463	(*c)->inject_data_packet (pkt);
		464	}
228	}	465	}
229		466
230	void	467	void
231	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
232	{	469	{
233	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
234	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
235		472
236	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	473	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
237	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
238		475
239	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
240	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
241	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
242	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	479	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
243	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
244	else if (dst > conns.size ())	481	else if (dst > conns.size ())
245	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	482	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else	484	else
248	{	485	{
249	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
250		487
251	if (dst == 0 && !THISNODE->routerprio)	488	if (dst == 0)
252	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
253	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
254	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
255	{	492	{
256	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
257	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
258	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
259	else	496	else
260	slog (L_WARN,	497	slog (L_WARN,
261	_("%s(%s): forwarding request (=> %s), but we are no router"),	498	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
262	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
263	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
264	}	501	}
265	else	502	else
266	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
267	}	504	}
268	}	505	}
269		506
270	void	507	bool
271	vpn::udpv4_ev (io_watcher &w, short revents)	508	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
272	{	509	{
273	if (revents & (POLLIN \| POLLERR))	510	switch (si.prot)
		511	{
		512	case PROT_IPv4:
		513	return send_ipv4_packet (pkt, si, tos);
		514
		515	case PROT_UDPv4:
		516	return send_udpv4_packet (pkt, si, tos);
		517
		518	#if ENABLE_TCP
		519	case PROT_TCPv4:
		520	return send_tcpv4_packet (pkt, si, tos);
		521	#endif
		522	#if ENABLE_ICMP
		523	case PROT_ICMPv4:
		524	return send_icmpv4_packet (pkt, si, tos);
		525	#endif
		526	#if ENABLE_DNS
		527	case PROT_DNSv4:
		528	return send_dnsv4_packet (pkt, si, tos);
		529	#endif
		530	default:
		531	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		532	}
		533
		534	return false;
		535	}
		536
		537	inline void
		538	vpn::ipv4_ev (ev::io &w, int revents)
		539	{
		540	if (revents & EV_READ)
274	{	541	{
275	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
276	struct sockaddr_in sa;	543	struct sockaddr_in sa;
277	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
278	int len;	545	int len;
279		546
280	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	547	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
281		548
282	sockinfo si(sa, PROT_UDPv4);	549	sockinfo si(sa, PROT_IPv4);
283		550
284	if (len > 0)	551	if (len > 0)
285	{	552	{
286	pkt->len = len;	553	pkt->len = len;
287		554
		555	// raw sockets deliver the ipv4 header, but don't expect it on sends
		556	pkt->skip_hdr (IP_OVERHEAD);
		557
288	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
289	}	559	}
290	else	560	else
291	{	561	{
292	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
293	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
294	}	564	}
295		565
296	delete pkt;	566	delete pkt;
297	}	567	}
298	else if (revents & POLLHUP)
299	{
300	// this cannot ;) happen on udp sockets
301	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
302	exit (1);
303	}
304	else	568	else
305	{	569	{
306	slog (L_ERR,	570	slog (L_ERR,
307	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
308	revents);	572	revents);
309	exit (1);	573	exit (EXIT_FAILURE);
310	}	574	}
311	}	575	}
312		576
313	void	577	#if ENABLE_ICMP
		578	inline void
314	vpn::ipv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
315	{	580	{
316	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
317	{	582	{
318	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
319	struct sockaddr_in sa;	584	struct sockaddr_in sa;
320	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
321	int len;	586	int len;
322		587
323	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	588	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
324		589
325	sockinfo si(sa, PROT_IPv4);	590	sockinfo si(sa, PROT_ICMPv4);
326		591
327	if (len > 0)	592	if (len > 0)
328	{	593	{
329	pkt->len = len;	594	pkt->len = len;
330		595
		596	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		597
		598	if (hdr->type == ::conf.icmp_type
		599	&& hdr->code == 255)
		600	{
331	// raw sockets deliver the ipv4, but don't expect it on sends	601	// raw sockets deliver the ipv4, but don't expect it on sends
332	// this is slow, but...	602	// this is slow, but...
333	pkt->skip_hdr (IP_OVERHEAD);	603	pkt->skip_hdr (ICMP_OVERHEAD);
		604
		605	recv_vpn_packet (pkt, si);
		606	}
		607	}
		608	else
		609	{
		610	// probably ECONNRESET or somesuch
		611	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		612	}
		613
		614	delete pkt;
		615	}
		616	else
		617	{
		618	slog (L_ERR,
		619	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		620	revents);
		621	exit (EXIT_FAILURE);
		622	}
		623	}
		624	#endif
		625
		626	inline void
		627	vpn::udpv4_ev (ev::io &w, int revents)
		628	{
		629	if (revents & EV_READ)
		630	{
		631	vpn_packet *pkt = new vpn_packet;
		632	struct sockaddr_in sa;
		633	socklen_t sa_len = sizeof (sa);
		634	int len;
		635
		636	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		637
		638	sockinfo si(sa, PROT_UDPv4);
		639
		640	if (len > 0)
		641	{
		642	pkt->len = len;
334		643
335	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
336	}	645	}
337	else	646	else
338	{	647	{
339	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
340	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	649	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
341	}	650	}
342		651
343	delete pkt;	652	delete pkt;
344	}	653	}
345	else if (revents & POLLHUP)
346	{
347	// this cannot ;) happen on udp sockets
348	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
349	exit (1);
350	}
351	else	654	else
352	{	655	{
353	slog (L_ERR,	656	slog (L_ERR,
354	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
355	revents);	658	revents);
356	exit (1);	659	exit (EXIT_FAILURE);
357	}	660	}
358	}	661	}
359		662
360	void	663	inline void
361	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
362	{	665	{
363	if (revents & POLLIN)	666	if (revents & EV_READ)
364	{	667	{
365	/* process data */	668	/* process data */
366	tap_packet *pkt;	669	tap_packet *pkt;
367		670
368	pkt = tap->recv ();	671	pkt = tap->recv ();
369		672
		673	if (!pkt)
		674	return;
		675
		676	if (pkt->len > 14)
		677	{
370	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
371	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
372		680
373	if (src != THISNODE->id)	681	if (src != THISNODE->id)
374	{
375	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
376	exit (1);
377	}
378
379	if (dst == THISNODE->id)
380	{
381	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
382	exit (1);
383	}
384
385	if (dst > conns.size ())
386	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else
388	{
389	if (dst)
390	{	682	{
391	// unicast	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
392	if (dst != THISNODE->id)	684	exit (EXIT_FAILURE);
393	conns[dst - 1]->inject_data_packet (pkt);
394	}	685	}
		686
		687	if (dst == THISNODE->id)
		688	{
		689	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		690	exit (EXIT_FAILURE);
		691	}
		692
		693	if (dst > conns.size ())
		694	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
395	else	695	else
396	{
397	// broadcast, first check router, then self, then english
398	connection *router = find_router ();
399
400	if (router)
401	router->inject_data_packet (pkt, true);	696	inject_data_packet (pkt, dst);
402	else
403	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
404	if ((*c)->conf != THISNODE)
405	(*c)->inject_data_packet (pkt);
406	}
407	}	697	}
408		698
409	delete pkt;	699	delete pkt;
410	}	700	}
411	else if (revents & (POLLHUP \| POLLERR))
412	{
413	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
414	exit (1);
415	}
416	else	701	else
417	abort ();	702	abort ();
418	}	703	}
419		704
420	void	705	inline void
421	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
422	{	707	{
423	if (events)	708	if (events)
424	{	709	{
425	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
426	{	711	{
427	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
428		713
429	shutdown_all ();	714	shutdown_all ();
430
431	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
432
433	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
434		717	exit (EXIT_SUCCESS);
435	exit (0);
436	}	718	}
437		719
438	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
439	{	721	{
440	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
441		723
442	reconnect_all ();	724	reconnect_all ();
443	}	725	}
444		726
445	events = 0;	727	events = 0;
446	}	728	}
447
448	w.at = TSTAMP_CANCEL;
449	}	729	}
450		730
451	void	731	void
452	vpn::shutdown_all ()	732	vpn::shutdown_all ()
453	{	733	{
463		743
464	conns.clear ();	744	conns.clear ();
465		745
466	connection_init ();	746	connection_init ();
467		747
468	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
469	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
470	{
471	connection *conn = new connection (this);
472		750
473	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
474	conns.push_back (conn);
475
476	conn->establish_connection ();	752	(*c)->establish_connection ();
477	}
478	}	753	}
479		754
480	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
481	{	756	{
482	u32 prio = 0;	757	return src != dst
		758	&& src->may_direct (dst)
		759	&& dst->may_direct (src)
		760	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		761	\|\| (src->protocols & dst->connectable_protocols ()));
		762	}
		763
		764	// only works for indirect and routed connections: find a router
		765	// from THISNODE to dst
		766	connection vpn::find_router_for (const connection dst)
		767	{
483	connection *router = 0;	768	connection *router = 0;
484		769
		770	// first try to find a router with a direct connection, route there
		771	// regardless of any other considerations.
		772	{
		773	u32 prio = 1;
		774
		775	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		776	{
		777	connection c = i;
		778
		779	if (c->conf->routerprio > prio
		780	&& c->conf != THISNODE
		781	&& can_direct (c->conf, dst->conf)
		782	&& c->ictx && c->octx)
		783	{
		784	prio = c->conf->routerprio;
		785	router = c;
		786	}
		787	}
		788	}
		789
		790	if (router)
		791	return router;
		792
		793	// second try find the router with the highest priority, higher than ours
		794	{
		795	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		796
		797	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		798	{
		799	connection c = i;
		800
		801	if (c->conf->routerprio > prio
		802	&& c != dst
		803	&& c->conf != THISNODE
		804	&& c->ictx && c->octx)
		805	{
		806	prio = c->conf->routerprio;
		807	router = c;
		808	}
		809	}
		810	}
		811
		812	return router;
		813	}
		814
		815	void vpn::connection_established (connection *c)
		816	{
485	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	817	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
486	{	818	{
487	connection c = i;	819	connection o = i;
488		820
489	if (c->conf->routerprio > prio	821	if (!o->is_direct
490	&& c->connectmode == conf_node::C_ALWAYS	822	&& o->si.valid ()
491	&& c->conf != THISNODE	823	&& c->si != o->si
492	&& c->ictx && c->octx)	824	&& c == find_router_for (o))
493	{
494	prio = c->conf->routerprio;
495	router = c;
496	}	825	{
		826	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		827	o->conf->nodename, c->conf->nodename);
		828	o->rekey ();
		829	}
497	}	830	}
498
499	return router;
500	}	831	}
501		832
502	void vpn::send_connect_request (int id)	833	void vpn::send_connect_request (connection *c)
503	{	834	{
504	connection *c = find_router ();	835	connection *r = find_router_for (c);
505		836
506	if (c)	837	if (r)
		838	{
		839	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		840	c->conf->nodename, r->conf->nodename);
507	c->send_connect_request (id);	841	r->send_connect_request (c->conf->id);
		842	}
508	else	843	else
509	// no router found, aggressively connect to all routers	844	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
510	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	845	c->conf->nodename);
511	if ((*i)->conf->routerprio)
512	(*i)->establish_connection ();
513	}	846	}
514		847
515	void	848	void
516	connection::dump_status ()	849	connection::dump_status ()
517	{	850	{
518	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	851	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
519	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	852	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
520	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	853	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
521	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	854	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
522	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	855	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
523	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
524	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
525	}	856	}
526		857
527	void	858	void
528	vpn::dump_status ()	859	vpn::dump_status ()
529	{	860	{
530	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	861	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
531		862
532	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	863	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
533	(*c)->dump_status ();	864	(*c)->dump_status ();
534		865
535	slog (L_NOTICE, _("END status dump"));	866	slog (L_NOTICE, _("END status dump"));
536	}	867	}
537		868
538	vpn::vpn (void)	869	vpn::vpn (void)
539	: event(this, &vpn::event_cb)	870	{
		871	event .set<vpn, &vpn::event_cb > (this);
540	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	872	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
541	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	873	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
542	, tap_ev_watcher (this, &vpn::tap_ev)
543	#if ENABLE_TCP	874	#if ENABLE_TCP
544	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	875	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
545	#endif	876	#endif
546	{	877	#if ENABLE_ICMP
		878	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		879	#endif
		880	#if ENABLE_DNS
		881	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		882	#endif
		883	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
547	}	884	}
548		885
549	vpn::~vpn ()	886	vpn::~vpn ()
550	{	887	{
551	}	888	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs. Revision 1.53 by pcg, Fri Aug 15 17:50:10 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.53 by pcg, Fri Aug 15 17:50:10 2008 UTC