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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 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 (int)	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	{
76	sockinfo si;	127	int success = 0;
77		128
78	si.set (THISNODE);	129	ipv4_tos = -1;
79
80	udpv4_fd = -1;	130	ipv4_fd = -1;
81		131
82	if (THISNODE->protocols & PROT_UDPv4)	132	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
83	{	133	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	134	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
85		135
86	if (udpv4_fd < 0)	136	if (ipv4_fd < 0)
87	return -1;	137	return -1;
88		138
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	139	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
90	{	140	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
92	exit (1);
93	}
94		141
95	#ifdef IP_MTU_DISCOVER	142	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	143	// this I really consider a linux bug. I am neither connected
97	// 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
98	// fragment for me sometimes.	145	// fragment for me sometimes.
99	{	146	{
100	int oval = IP_PMTUDISC_DONT;	147	int oval = IP_PMTUDISC_DONT;
101	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);
102	}	158	}
103	#endif	159
		160	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		161	++success;
		162	}
		163	else
		164	THISNODE->protocols &= ~PROT_IPv4;
		165
		166	udpv4_tos = -1;
		167	udpv4_fd = -1;
		168
		169	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		170	{
		171	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		172
		173	if (udpv4_fd < 0)
		174	return -1;
		175
		176	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		177	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
104		178
105	// standard daemon practise...	179	// standard daemon practise...
106	{	180	{
107	int oval = 1;	181	int oval = 1;
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	182	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
109	}	183	}
110		184
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	185	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
112	}
113
114	ipv4_fd = -1;
115	if (THISNODE->protocols & PROT_IPv4)
116	{
117	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
118
119	if (ipv4_fd < 0)
120	return -1;
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{
124	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
125	exit (1);
126	}
127
128	#ifdef 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	}
		251
		252	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		253	++success;
		254	}
		255	#endif
		256
		257	tcpv4_fd = -1;
		258
		259	#if ENABLE_TCP
		260	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		261	{
		262	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		263
		264	if (tcpv4_fd < 0)
		265	return -1;
		266
		267	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		268	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		269
		270	// standard daemon practise...
		271	{
		272	int oval = 1;
		273	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		274	}
		275
		276	sockinfo si (THISNODE, PROT_TCPv4);
		277
		278	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		279	{
		280	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		281	exit (EXIT_FAILURE);
		282	}
		283
		284	if (listen (tcpv4_fd, 5))
		285	{
		286	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		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);
		320	}
136	#endif	321	# endif
137		322
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	323	// standard daemon practise...
		324	{
		325	int oval = 1;
		326	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	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	/////////////////////////////////////////////////////////////////////////////
140		355
141	tap = new tap_device ();	356	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	357	if (!tap) //D this, of course, never catches
143	{	358	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	359	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
145	exit (1);	360	exit (EXIT_FAILURE);
146	}	361	}
147		362
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	363	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
149		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
150	tap_ev_watcher.start (tap->fd, POLLIN);	383	tap_ev_watcher.start (tap->fd, EV_READ);
151
152	reconnect_all ();
153		384
154	return 0;	385	return 0;
155	}	386	}
156		387
		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
157	void	448	void
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	449	vpn::inject_data_packet (tap_packet *pkt, int dst)
159	{	450	{
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	451	if (dst)
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	452	{
162	}	453	// unicast
163		454	if (dst != THISNODE->id)
164	void	455	conns[dst - 1]->inject_data_packet (pkt);
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	456	}
166	{	457	else
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	458	{
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	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	}
169	}	465	}
170		466
171	void	467	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	468	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	469	{
174	unsigned int src = pkt->src ();	470	unsigned int src = pkt->src ();
175	unsigned int dst = pkt->dst ();	471	unsigned int dst = pkt->dst ();
176		472
177	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."),
178	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	474	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
179		475
180	if (src == 0 \|\| src > conns.size ()	476	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	477	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	478	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	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)."),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	480	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		481	else if (dst > conns.size ())
		482	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
		483	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	484	else
186	{	485	{
187	connection *c = conns[src - 1];	486	connection *c = conns[src - 1];
188		487
189	if (dst == 0 && !THISNODE->routerprio)	488	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	489	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
191	c->conf->nodename, (const char *)rsi);	490	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	491	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	492	{
		493	if (THISNODE->routerprio)
		494	// the tos setting gets lost here. who cares.
		495	conns[dst - 1]->inject_vpn_packet (pkt);
		496	else
194	slog (L_WARN,	497	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	498	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		499	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	500	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	501	}
198	THISNODE->id, THISNODE->nodename);
199	else	502	else
200	c->recv_vpn_packet (pkt, rsi);	503	c->recv_vpn_packet (pkt, rsi);
201	}	504	}
202	}	505	}
203		506
204	void	507	bool
205	vpn::udpv4_ev (short revents)	508	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	509	{
207	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)
208	{	541	{
209	vpn_packet *pkt = new vpn_packet;	542	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	543	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	544	socklen_t sa_len = sizeof (sa);
212	int len;	545	int len;
213		546
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	547	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		548
216	sockinfo si(sa);	549	sockinfo si(sa, PROT_IPv4);
217		550
218	if (len > 0)	551	if (len > 0)
219	{	552	{
220	pkt->len = len;	553	pkt->len = len;
221		554
		555	// raw sockets deliver the ipv4 header, but don't expect it on sends
		556	pkt->skip_hdr (IP_OVERHEAD);
		557
222	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
223	}	559	}
224	else	560	else
225	{	561	{
226	// probably ECONNRESET or somesuch	562	// probably ECONNRESET or somesuch
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	563	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
228	}	564	}
229		565
230	delete pkt;	566	delete pkt;
231	}	567	}
232	else if (revents & POLLHUP)
233	{
234	// this cannot ;) happen on udp sockets
235	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
236	exit (1);
237	}
238	else	568	else
239	{	569	{
240	slog (L_ERR,	570	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	571	_("FATAL: unknown revents %08x in socket, exiting.\n"),
242	revents);	572	revents);
243	exit (1);	573	exit (EXIT_FAILURE);
244	}	574	}
245	}	575	}
246		576
247	void	577	#if ENABLE_ICMP
248	vpn::ipv4_ev (short revents)	578	inline void
		579	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	580	{
250	if (revents & (POLLIN \| POLLERR))	581	if (revents & EV_READ)
251	{	582	{
252	vpn_packet *pkt = new vpn_packet;	583	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	584	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	585	socklen_t sa_len = sizeof (sa);
255	int len;	586	int len;
256		587
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	588	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		589
259	sockinfo si(sa, PROT_IPv4);	590	sockinfo si(sa, PROT_ICMPv4);
260		591
261	if (len > 0)	592	if (len > 0)
262	{	593	{
263	pkt->len = len;	594	pkt->len = len;
264		595
		596	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		597
		598	if (hdr->type == ::conf.icmp_type
		599	&& hdr->code == 255)
		600	{
265	// 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
266	// this is slow, but...	602	// this is slow, but...
267	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;
268		643
269	recv_vpn_packet (pkt, si);	644	recv_vpn_packet (pkt, si);
270	}	645	}
271	else	646	else
272	{	647	{
273	// probably ECONNRESET or somesuch	648	// probably ECONNRESET or somesuch
274	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));
275	}	650	}
276		651
277	delete pkt;	652	delete pkt;
278	}	653	}
279	else if (revents & POLLHUP)
280	{
281	// this cannot ;) happen on udp sockets
282	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
283	exit (1);
284	}
285	else	654	else
286	{	655	{
287	slog (L_ERR,	656	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	657	_("FATAL: unknown revents %08x in socket, exiting.\n"),
289	revents);	658	revents);
290	exit (1);	659	exit (EXIT_FAILURE);
291	}	660	}
292	}	661	}
293		662
294	void	663	inline void
295	vpn::tap_ev (short revents)	664	vpn::tap_ev (ev::io &w, int revents)
296	{	665	{
297	if (revents & POLLIN)	666	if (revents & EV_READ)
298	{	667	{
299	/* process data */	668	/* process data */
300	tap_packet *pkt;	669	tap_packet *pkt;
301		670
302	pkt = tap->recv ();	671	pkt = tap->recv ();
303		672
		673	if (!pkt)
		674	return;
		675
		676	if (pkt->len > 14)
		677	{
304	int dst = mac2id (pkt->dst);	678	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	679	int src = mac2id (pkt->src);
306		680
307	if (src != THISNODE->id)	681	if (src != THISNODE->id)
308	{
309	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
310	exit (1);
311	}
312
313	if (dst == THISNODE->id)
314	{
315	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
316	exit (1);
317	}
318
319	if (dst > conns.size ())
320	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
321	else
322	{
323	if (dst)
324	{	682	{
325	// unicast	683	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	684	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	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);
329	else	695	else
330	{
331	// broadcast, first check router, then self, then english
332	connection *router = find_router ();
333
334	if (router)
335	router->inject_data_packet (pkt, true);	696	inject_data_packet (pkt, dst);
336	else
337	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
338	if ((*c)->conf != THISNODE)
339	(*c)->inject_data_packet (pkt);
340	}
341	}	697	}
342		698
343	delete pkt;	699	delete pkt;
344	}	700	}
345	else if (revents & (POLLHUP \| POLLERR))
346	{
347	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
348	exit (1);
349	}
350	else	701	else
351	abort ();	702	abort ();
352	}	703	}
353		704
354	void	705	inline void
355	vpn::event_cb (tstamp &ts)	706	vpn::event_cb (ev::timer &w, int)
356	{	707	{
357	if (events)	708	if (events)
358	{	709	{
359	if (events & EVENT_SHUTDOWN)	710	if (events & EVENT_SHUTDOWN)
360	{	711	{
361	slog (L_INFO, _("preparing shutdown..."));	712	slog (L_INFO, _("preparing shutdown..."));
362		713
363	shutdown_all ();	714	shutdown_all ();
364
365	remove_pid (pidfilename);	715	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	716	slog (L_INFO, _("exiting."));
368		717	exit (EXIT_SUCCESS);
369	exit (0);
370	}	718	}
371		719
372	if (events & EVENT_RECONNECT)	720	if (events & EVENT_RECONNECT)
373	{	721	{
374	slog (L_INFO, _("forced reconnect"));	722	slog (L_INFO, _("forced reconnect."));
375		723
376	reconnect_all ();	724	reconnect_all ();
377	}	725	}
378		726
379	events = 0;	727	events = 0;
380	}	728	}
381
382	ts = TSTAMP_CANCEL;
383	}	729	}
384		730
385	void	731	void
386	vpn::shutdown_all ()	732	vpn::shutdown_all ()
387	{	733	{
397		743
398	conns.clear ();	744	conns.clear ();
399		745
400	connection_init ();	746	connection_init ();
401		747
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	748	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
403	i != conf.nodes.end (); ++i)	749	conns.push_back (new connection (this, *i));
404	{
405	connection *conn = new connection (this);
406		750
407	conn->conf = *i;	751	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
408	conns.push_back (conn);
409
410	conn->establish_connection ();	752	(*c)->establish_connection ();
411	}
412	}	753	}
413		754
414	connection *vpn::find_router ()	755	bool vpn::can_direct (conf_node src, conf_node dst) const
415	{	756	{
416	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	{
417	connection *router = 0;	768	connection *router = 0;
418		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	{
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	826	{
421	connection c = i;	827	connection o = i;
422		828
423	if (c->conf->routerprio > prio	829	if (!o->is_direct
424	&& c->connectmode == conf_node::C_ALWAYS	830	&& o->si.valid ()
425	&& c->conf != THISNODE	831	&& c->si != o->si
426	&& c->ictx && c->octx)	832	&& c == find_router_for (o))
427	{
428	prio = c->conf->routerprio;
429	router = c;
430	}	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	}
431	}	838	}
432
433	return router;
434	}	839	}
435		840
436	void vpn::connect_request (int id)	841	void vpn::send_connect_request (connection *c)
437	{	842	{
438	connection *c = find_router ();	843	connection *r = find_router_for (c);
439		844
440	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);
441	c->connect_request (id);	849	r->send_connect_request (c->conf->id);
442	//else // does not work, because all others must connect to the same router	850	}
443	// // no router found, aggressively connect to all routers	851	else
444	// 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."),
445	// if ((*i)->conf->routerprio)	853	c->conf->nodename);
446	// (*i)->establish_connection ();
447	}	854	}
448		855
449	void	856	void
450	connection::dump_status ()	857	connection::dump_status ()
451	{	858	{
452	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
453	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
454	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
455	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"),
456	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
457	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
458	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
459	}	864	}
460		865
461	void	866	void
462	vpn::dump_status ()	867	vpn::dump_status ()
463	{	868	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		870
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	872	(*c)->dump_status ();
468		873
469	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
470	}	875	}
471		876
472	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
		879	event .set<vpn, &vpn::event_cb > (this);
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
475	, tap_ev_watcher(this, &vpn::tap_ev)	882	#if ENABLE_TCP
476	, event(this, &vpn::event_cb)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
477	{	884	#endif
		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);
478	}	892	}
479		893
480	vpn::~vpn ()	894	vpn::~vpn ()
481	{	895	{
482	}	896	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.51 by pcg, Sun Aug 10 14:48:57 2008 UTC