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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 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	}	386	}
188		387
189	// send a vpn packet out to other hosts	388	bool
		389	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		390	{
		391	set_tos (ipv4_fd, ipv4_tos, tos);
		392	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		393
		394	return true;
		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
		438
		439	bool
		440	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		441	{
		442	set_tos (udpv4_fd, udpv4_tos, tos);
		443	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		444
		445	return true;
		446	}
		447
190	void	448	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	449	vpn::inject_data_packet (tap_packet *pkt, int dst)
192	{	450	{
193	switch (si.prot)	451	if (dst)
194	{
195	case PROT_IPv4:
196	send_ipv4_packet (pkt, si, tos);
197	break;
198
199	case PROT_UDPv4:
200	send_udpv4_packet (pkt, si, tos);
201	break;
202
203	#if ENABLE_TCP
204	case PROT_TCPv4:
205	send_tcpv4_packet (pkt, si, tos);
206	break;
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	abort ();
212	}	452	{
213	}	453	// unicast
214		454	if (dst != THISNODE->id)
215	void	455	conns[dst - 1]->inject_data_packet (pkt);
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	456	}
217	{	457	else
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	458	{
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	459	// broadcast, this is ugly, but due to the security policy
220	}	460	// we have to connect to all hosts...
221		461	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
222	void	462	if ((*c)->conf != THISNODE)
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	463	(*c)->inject_data_packet (pkt);
224	{	464	}
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
227	}	465	}
228		466
229	void	467	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	469	{
232	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
233	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
234		472
235	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."),
236	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
237		475
238	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	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)."),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else if (dst > conns.size ())	481	else if (dst > conns.size ())
244	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)."),
245	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
246	else	484	else
247	{	485	{
248	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
249		487
250	if (dst == 0 && !THISNODE->routerprio)	488	if (dst == 0)
251	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
252	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
253	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
254	{	492	{
255	if (THISNODE->routerprio)	493	if (THISNODE->routerprio)
256	// the tos setting gets lost here. who cares.	494	// the tos setting gets lost here. who cares.
257	conns[dst - 1]->inject_vpn_packet (pkt);	495	conns[dst - 1]->inject_vpn_packet (pkt);
258	else	496	else
259	slog (L_WARN,	497	slog (L_WARN,
260	_("%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?)."),
261	c->conf->nodename, (const char *)rsi,	499	c->conf->nodename, (const char *)rsi,
262	conns[dst - 1]->conf->nodename);	500	conns[dst - 1]->conf->nodename);
263	}	501	}
264	else	502	else
265	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
266	}	504	}
267	}	505	}
268		506
269	void	507	bool
270	vpn::udpv4_ev (io_watcher &w, short revents)	508	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
271	{	509	{
272	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)
273	{	541	{
274	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
275	struct sockaddr_in sa;	543	struct sockaddr_in sa;
276	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
277	int len;	545	int len;
278		546
279	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);
280		548
281	sockinfo si(sa, PROT_UDPv4);	549	sockinfo si(sa, PROT_IPv4);
282		550
283	if (len > 0)	551	if (len > 0)
284	{	552	{
285	pkt->len = len;	553	pkt->len = len;
286		554
		555	// raw sockets deliver the ipv4 header, but don't expect it on sends
		556	pkt->skip_hdr (IP_OVERHEAD);
		557
287	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
288	}	559	}
289	else	560	else
290	{	561	{
291	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
292	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));
293	}	564	}
294		565
295	delete pkt;	566	delete pkt;
296	}	567	}
297	else if (revents & POLLHUP)
298	{
299	// this cannot ;) happen on udp sockets
300	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
301	exit (1);
302	}
303	else	568	else
304	{	569	{
305	slog (L_ERR,	570	slog (L_ERR,
306	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
307	revents);	572	revents);
308	exit (1);	573	exit (EXIT_FAILURE);
309	}	574	}
310	}	575	}
311		576
312	void	577	#if ENABLE_ICMP
		578	inline void
313	vpn::ipv4_ev (io_watcher &w, short revents)	579	vpn::icmpv4_ev (ev::io &w, int revents)
314	{	580	{
315	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
316	{	582	{
317	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
318	struct sockaddr_in sa;	584	struct sockaddr_in sa;
319	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
320	int len;	586	int len;
321		587
322	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);
323		589
324	sockinfo si(sa, PROT_IPv4);	590	sockinfo si(sa, PROT_ICMPv4);
325		591
326	if (len > 0)	592	if (len > 0)
327	{	593	{
328	pkt->len = len;	594	pkt->len = len;
329		595
		596	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		597
		598	if (hdr->type == ::conf.icmp_type
		599	&& hdr->code == 255)
		600	{
330	// 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
331	// this is slow, but...	602	// this is slow, but...
332	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;
333		643
334	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
335	}	645	}
336	else	646	else
337	{	647	{
338	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
339	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));
340	}	650	}
341		651
342	delete pkt;	652	delete pkt;
343	}	653	}
344	else if (revents & POLLHUP)
345	{
346	// this cannot ;) happen on udp sockets
347	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
348	exit (1);
349	}
350	else	654	else
351	{	655	{
352	slog (L_ERR,	656	slog (L_ERR,
353	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
354	revents);	658	revents);
355	exit (1);	659	exit (EXIT_FAILURE);
356	}	660	}
357	}	661	}
358		662
359	void	663	inline void
360	vpn::tap_ev (io_watcher &w, short revents)	664	vpn::tap_ev (ev::io &w, int revents)
361	{	665	{
362	if (revents & POLLIN)	666	if (revents & EV_READ)
363	{	667	{
364	/* process data */	668	/* process data */
365	tap_packet *pkt;	669	tap_packet *pkt;
366		670
367	pkt = tap->recv ();	671	pkt = tap->recv ();
368		672
		673	if (!pkt)
		674	return;
		675
		676	if (pkt->len > 14)
		677	{
369	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
370	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
371		680
372	if (src != THISNODE->id)	681	if (src != THISNODE->id)
373	{
374	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
375	exit (1);
376	}
377
378	if (dst == THISNODE->id)
379	{
380	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
381	exit (1);
382	}
383
384	if (dst > conns.size ())
385	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
386	else
387	{
388	if (dst)
389	{	682	{
390	// unicast	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
391	if (dst != THISNODE->id)	684	exit (EXIT_FAILURE);
392	conns[dst - 1]->inject_data_packet (pkt);
393	}	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);
394	else	695	else
395	{
396	// broadcast, first check router, then self, then english
397	connection *router = find_router ();
398
399	if (router)
400	router->inject_data_packet (pkt, true);	696	inject_data_packet (pkt, dst);
401	else
402	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
403	if ((*c)->conf != THISNODE)
404	(*c)->inject_data_packet (pkt);
405	}
406	}	697	}
407		698
408	delete pkt;	699	delete pkt;
409	}	700	}
410	else if (revents & (POLLHUP \| POLLERR))
411	{
412	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
413	exit (1);
414	}
415	else	701	else
416	abort ();	702	abort ();
417	}	703	}
418		704
419	void	705	inline void
420	vpn::event_cb (time_watcher &w)	706	vpn::event_cb (ev::timer &w, int)
421	{	707	{
422	if (events)	708	if (events)
423	{	709	{
424	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
425	{	711	{
426	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
427		713
428	shutdown_all ();	714	shutdown_all ();
429
430	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
431
432	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
433		717	exit (EXIT_SUCCESS);
434	exit (0);
435	}	718	}
436		719
437	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
438	{	721	{
439	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
440		723
441	reconnect_all ();	724	reconnect_all ();
442	}	725	}
443		726
444	events = 0;	727	events = 0;
445	}	728	}
446
447	w.at = TSTAMP_CANCEL;
448	}	729	}
449		730
450	void	731	void
451	vpn::shutdown_all ()	732	vpn::shutdown_all ()
452	{	733	{
462		743
463	conns.clear ();	744	conns.clear ();
464		745
465	connection_init ();	746	connection_init ();
466		747
467	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
468	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
469	{
470	connection *conn = new connection (this);
471		750
472	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
473	conns.push_back (conn);
474
475	conn->establish_connection ();	752	(*c)->establish_connection ();
476	}
477	}	753	}
478		754
479	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
480	{	756	{
481	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	{
482	connection *router = 0;	768	connection *router = 0;
483		769
		770	// first try to find a router with a direct connection
		771	{
		772	u32 prio = 1;
		773
		774	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		775	{
		776	connection c = i;
		777
		778	if (c->conf->routerprio > prio
		779	&& c->conf != THISNODE
		780	&& c != dst
		781	&& can_direct (c->conf, dst->conf))
		782	{
		783	if (c->ictx && c->octx)
		784	{
		785	prio = c->conf->routerprio;
		786	router = c;
		787	}
		788	else
		789	c->establish_connection ();
		790	}
		791	}
		792	}
		793
		794	if (router)
		795	return router;
		796
		797	// second try find the router with the highest priority higher than ours
		798	{
		799	u32 prio = 1;
		800
		801	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		802	{
		803	connection c = i;
		804
		805	if (c->conf->routerprio > prio
		806	&& c->conf->routerprio > THISNODE->routerprio
		807	&& c != dst
		808	&& c->conf != THISNODE)
		809	{
		810	if (c->ictx && c->octx)
		811	{
		812	prio = c->conf->routerprio;
		813	router = c;
		814	}
		815	else
		816	c->establish_connection ();
		817	}
		818	}
		819	}
		820	return router;
		821	}
		822
		823	void vpn::connection_established (connection *c)
		824	{
484	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
485	{	826	{
486	connection c = i;	827	connection o = i;
487		828
488	if (c->conf->routerprio > prio	829	if (!o->is_direct
489	&& c->connectmode == conf_node::C_ALWAYS	830	&& o->si.valid ()
490	&& c->conf != THISNODE	831	&& c->si != o->si
491	&& c->ictx && c->octx)	832	&& c == find_router_for (o))
492	{
493	prio = c->conf->routerprio;
494	router = c;
495	}	833	{
		834	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		835	o->conf->nodename, c->conf->nodename);
		836	o->rekey ();
		837	}
496	}	838	}
497
498	return router;
499	}	839	}
500		840
501	void vpn::connect_request (int id)	841	void vpn::send_connect_request (connection *c)
502	{	842	{
503	connection *c = find_router ();	843	connection *r = find_router_for (c);
504		844
505	if (c)	845	if (r)
		846	{
		847	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		848	c->conf->nodename, r->conf->nodename);
506	c->connect_request (id);	849	r->send_connect_request (c->conf->id);
507	//else // does not work, because all others must connect to the same router	850	}
508	// // no router found, aggressively connect to all routers	851	else
509	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
510	// if ((*i)->conf->routerprio)	853	c->conf->nodename);
511	// (*i)->establish_connection ();
512	}	854	}
513		855
514	void	856	void
515	connection::dump_status ()	857	connection::dump_status ()
516	{	858	{
517	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
518	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
519	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
520	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	862	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
521	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
522	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
523	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
524	}	864	}
525		865
526	void	866	void
527	vpn::dump_status ()	867	vpn::dump_status ()
528	{	868	{
529	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
530		870
531	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
532	(*c)->dump_status ();	872	(*c)->dump_status ();
533		873
534	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
535	}	875	}
536		876
537	vpn::vpn (void)	877	vpn::vpn (void)
538	: event(this, &vpn::event_cb)	878	{
		879	event .set<vpn, &vpn::event_cb > (this);
539	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
540	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
541	, tap_ev_watcher (this, &vpn::tap_ev)
542	#if ENABLE_TCP	882	#if ENABLE_TCP
543	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
544	#endif	884	#endif
545	{	885	#if ENABLE_ICMP
		886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		887	#endif
		888	#if ENABLE_DNS
		889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		890	#endif
		891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
546	}	892	}
547		893
548	vpn::~vpn ()	894	vpn::~vpn ()
549	{	895	{
550	}	896	}

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/vpn.C (file contents): Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC