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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.49 by pcg, Sun Aug 10 01:34:36 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	ipv4_tos = -1;
76	ipv4_fd = -1;	128	ipv4_fd = -1;
77		129
78	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	131	{
80	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		133
82	if (ipv4_fd < 0)	134	if (ipv4_fd < 0)
83	return -1;	135	return -1;
84		136
85	sockinfo si (THISNODE, PROT_IPv4);	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
86		139
87	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
88	{
89	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
90	exit (1);
91	}
92
93	#ifdef IP_MTU_DISCOVER
94	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
95	// nor do I fragment myself. Linux still sets DF and doesn't	142	// nor do I fragment myself. Linux still sets DF and doesn't
96	// fragment for me sometimes.	143	// fragment for me sometimes.
97	{	144	{
98	int oval = IP_PMTUDISC_DONT;	145	int oval = IP_PMTUDISC_DONT;
99	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	146	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100	}	147	}
101	#endif	148	#endif
102		149
		150	sockinfo si (THISNODE, PROT_IPv4);
		151
		152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		153	{
		154	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		155	exit (EXIT_FAILURE);
		156	}
		157
103	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
104	}	159	}
105		160
		161	udpv4_tos = -1;
106	udpv4_fd = -1;	162	udpv4_fd = -1;
107		163
108	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
109	{	165	{
110	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111		167
112	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
113	return -1;	169	return -1;
114		170
		171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
		173
115	// standard daemon practise...	174	// standard daemon practise...
116	{	175	{
117	int oval = 1;	176	int oval = 1;
118	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119	}	178	}
120		179
121	sockinfo si (THISNODE, PROT_UDPv4);	180	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
122
123	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
124	{
125	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
126	exit (1);
127	}
128
129	#ifdef IP_MTU_DISCOVER
130	// this I really consider a linux bug. I am neither connected	181	// this I really consider a linux bug. I am neither connected
131	// nor do I fragment myself. Linux still sets DF and doesn't	182	// nor do I fragment myself. Linux still sets DF and doesn't
132	// fragment for me sometimes.	183	// fragment for me sometimes.
133	{	184	{
134	int oval = IP_PMTUDISC_DONT;	185	int oval = IP_PMTUDISC_DONT;
135	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	186	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136	}	187	}
137	#endif	188	#endif
138		189
		190	sockinfo si (THISNODE, PROT_UDPv4);
		191
		192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		193	{
		194	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		195	exit (EXIT_FAILURE);
		196	}
		197
139	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		199	}
		200
		201	icmpv4_tos = -1;
		202	icmpv4_fd = -1;
		203
		204	#if ENABLE_ICMP
		205	if (THISNODE->protocols & PROT_ICMPv4)
		206	{
		207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		208
		209	if (icmpv4_fd < 0)
		210	return -1;
		211
		212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		214
		215	#ifdef ICMP_FILTER
		216	{
		217	icmp_filter oval;
		218	oval.data = 0xffffffff;
		219	if (::conf.icmp_type < 32)
		220	oval.data &= ~(1 << ::conf.icmp_type);
		221
		222	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
140	}	223	}
		224	#endif
		225
		226	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		227	// this I really consider a linux bug. I am neither connected
		228	// nor do I fragment myself. Linux still sets DF and doesn't
		229	// fragment for me sometimes.
		230	{
		231	int oval = IP_PMTUDISC_DONT;
		232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		233	}
		234	#endif
		235
		236	sockinfo si (THISNODE, PROT_ICMPv4);
		237
		238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		239	{
		240	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		241	exit (EXIT_FAILURE);
		242	}
		243
		244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		245	}
		246	#endif
141		247
142	tcpv4_fd = -1;	248	tcpv4_fd = -1;
143		249
144	#if ENABLE_TCP	250	#if ENABLE_TCP
145	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	251	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
147	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	253	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
148		254
149	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
150	return -1;	256	return -1;
151		257
		258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		260
152	// standard daemon practise...	261	// standard daemon practise...
153	{	262	{
154	int oval = 1;	263	int oval = 1;
155	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
156	}	265	}
157		266
158	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
159		268
160	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161	{	270	{
162	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	271	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
163	exit (1);	272	exit (EXIT_FAILURE);
164	}	273	}
165		274
166	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
167	{	276	{
168	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	277	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
169	exit (1);	278	exit (EXIT_FAILURE);
		279	}
		280
		281	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		282	}
		283	#endif
		284
		285	dnsv4_tos = -1;
		286	dnsv4_fd = -1;
		287
		288	#if ENABLE_DNS
		289	if (THISNODE->protocols & PROT_DNSv4)
		290	{
		291	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		292
		293	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		294
		295	if (dnsv4_fd < 0)
		296	return -1;
		297
		298	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		299	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		300
		301	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		302	// this I really consider a linux bug. I am neither connected
		303	// nor do I fragment myself. Linux still sets DF and doesn't
		304	// fragment for me sometimes.
		305	{
		306	int oval = IP_PMTUDISC_DONT;
		307	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
170	}	308	}
171
172	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
173	}
174	#endif	309	# endif
		310
		311	// standard daemon practise...
		312	{
		313	int oval = 1;
		314	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		315	}
		316
		317	sockinfo si (THISNODE->dns_hostname,
		318	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		319	PROT_DNSv4);
		320
		321	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		322	{
		323	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		324	exit (EXIT_FAILURE);
		325	}
		326
		327	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		328	}
		329	#endif
		330
		331	/////////////////////////////////////////////////////////////////////////////
		332
		333	reconnect_all ();
		334
		335	/////////////////////////////////////////////////////////////////////////////
175		336
176	tap = new tap_device ();	337	tap = new tap_device ();
177	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
178	{	339	{
179	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
180	exit (1);	341	exit (EXIT_FAILURE);
181	}	342	}
182		343
183	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
184		345
		346	run_script_cb cb;
		347	cb.set<vpn, &vpn::script_if_init> (this);
		348
		349	if (tap->if_up () &&
		350	!run_script (cb, true))
		351	{
		352	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		353	tap->if_up ());
		354	exit (EXIT_FAILURE);
		355	}
		356
		357	cb.set<vpn, &vpn::script_if_up> (this);
		358	if (!run_script (cb, true))
		359	{
		360	slog (L_ERR, _("if-up command execution failed, exiting."));
		361	exit (EXIT_FAILURE);
		362	}
		363
185	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
186
187	reconnect_all ();
188		365
189	return 0;	366	return 0;
190	}
191
192	// send a vpn packet out to other hosts
193	bool
194	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
195	{
196	switch (si.prot)
197	{
198	case PROT_IPv4:
199	return send_ipv4_packet (pkt, si, tos);
200
201	case PROT_UDPv4:
202	return send_udpv4_packet (pkt, si, tos);
203
204	#if ENABLE_TCP
205	case PROT_TCPv4:
206	return send_tcpv4_packet (pkt, si, tos);
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	return false;
212	}
213	}	367	}
214		368
215	bool	369	bool
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	370	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	371	{
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	372	set_tos (ipv4_fd, ipv4_tos, tos);
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	373	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220		374
221	return true;	375	return true;
222	}	376	}
		377
		378	static u16
		379	ipv4_checksum (u16 *data, unsigned int len)
		380	{
		381	// use 32 bit accumulator and fold back carry bits at the end
		382	u32 sum = 0;
		383
		384	while (len > 1)
		385	{
		386	sum += *data++;
		387	len -= 2;
		388	}
		389
		390	// odd byte left?
		391	if (len)
		392	sum += (u8 )data;
		393
		394	// add back carry bits
		395	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		396	sum += (sum >> 16); // carry
		397
		398	return ~sum;
		399	}
		400
		401	#if ENABLE_ICMP
		402	bool
		403	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		404	{
		405	pkt->unshift_hdr (4);
		406
		407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		408	hdr->type = ::conf.icmp_type;
		409	hdr->code = 255;
		410	hdr->checksum = 0;
		411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
		414	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		415
		416	return true;
		417	}
		418	#endif
223		419
224	bool	420	bool
225	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	421	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
226	{	422	{
227	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	423	set_tos (udpv4_fd, udpv4_tos, tos);
228	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	424	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
229		425
230	return true;	426	return true;
		427	}
		428
		429	void
		430	vpn::inject_data_packet (tap_packet *pkt, int dst)
		431	{
		432	if (dst)
		433	{
		434	// unicast
		435	if (dst != THISNODE->id)
		436	conns[dst - 1]->inject_data_packet (pkt);
		437	}
		438	else
		439	{
		440	// broadcast, this is ugly, but due to the security policy
		441	// we have to connect to all hosts...
		442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		443	if ((*c)->conf != THISNODE)
		444	(*c)->inject_data_packet (pkt);
		445	}
231	}	446	}
232		447
233	void	448	void
234	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
235	{	450	{
236	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
237	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
238		453
239	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	454	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
240	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
241		456
242	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
243	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
244	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
245	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	460	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else if (dst > conns.size ())	462	else if (dst > conns.size ())
248	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	463	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
249	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
250	else	465	else
251	{	466	{
252	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
253		468
254	if (dst == 0 && !THISNODE->routerprio)	469	if (dst == 0)
255	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
256	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
257	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
258	{	473	{
259	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
260	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
261	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
262	else	477	else
263	slog (L_WARN,	478	slog (L_WARN,
264	_("%s(%s): forwarding request (=> %s), but we are no router"),	479	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
265	c->conf->nodename, (const char *)rsi,	480	c->conf->nodename, (const char *)rsi,
266	conns[dst - 1]->conf->nodename);	481	conns[dst - 1]->conf->nodename);
267	}	482	}
268	else	483	else
269	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
270	}	485	}
271	}	486	}
272		487
273	void	488	bool
274	vpn::udpv4_ev (io_watcher &w, short revents)	489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	490	{
276	if (revents & (POLLIN \| POLLERR))	491	switch (si.prot)
		492	{
		493	case PROT_IPv4:
		494	return send_ipv4_packet (pkt, si, tos);
		495
		496	case PROT_UDPv4:
		497	return send_udpv4_packet (pkt, si, tos);
		498
		499	#if ENABLE_TCP
		500	case PROT_TCPv4:
		501	return send_tcpv4_packet (pkt, si, tos);
		502	#endif
		503	#if ENABLE_ICMP
		504	case PROT_ICMPv4:
		505	return send_icmpv4_packet (pkt, si, tos);
		506	#endif
		507	#if ENABLE_DNS
		508	case PROT_DNSv4:
		509	return send_dnsv4_packet (pkt, si, tos);
		510	#endif
		511	default:
		512	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		513	}
		514
		515	return false;
		516	}
		517
		518	inline void
		519	vpn::ipv4_ev (ev::io &w, int revents)
		520	{
		521	if (revents & EV_READ)
277	{	522	{
278	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
279	struct sockaddr_in sa;	524	struct sockaddr_in sa;
280	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
281	int len;	526	int len;
282		527
283	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	528	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
284		529
285	sockinfo si(sa, PROT_UDPv4);	530	sockinfo si(sa, PROT_IPv4);
286		531
287	if (len > 0)	532	if (len > 0)
288	{	533	{
289	pkt->len = len;	534	pkt->len = len;
290		535
		536	// raw sockets deliver the ipv4 header, but don't expect it on sends
		537	pkt->skip_hdr (IP_OVERHEAD);
		538
291	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
292	}	540	}
293	else	541	else
294	{	542	{
295	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
296	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	544	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
297	}	545	}
298		546
299	delete pkt;	547	delete pkt;
300	}	548	}
301	else if (revents & POLLHUP)
302	{
303	// this cannot ;) happen on udp sockets
304	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
305	exit (1);
306	}
307	else	549	else
308	{	550	{
309	slog (L_ERR,	551	slog (L_ERR,
310	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
311	revents);	553	revents);
312	exit (1);	554	exit (EXIT_FAILURE);
313	}	555	}
314	}	556	}
315		557
316	void	558	#if ENABLE_ICMP
		559	inline void
317	vpn::ipv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
318	{	561	{
319	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
320	{	563	{
321	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
322	struct sockaddr_in sa;	565	struct sockaddr_in sa;
323	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
324	int len;	567	int len;
325		568
326	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	569	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
327		570
328	sockinfo si(sa, PROT_IPv4);	571	sockinfo si(sa, PROT_ICMPv4);
329		572
330	if (len > 0)	573	if (len > 0)
331	{	574	{
332	pkt->len = len;	575	pkt->len = len;
333		576
		577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		578
		579	if (hdr->type == ::conf.icmp_type
		580	&& hdr->code == 255)
		581	{
334	// raw sockets deliver the ipv4, but don't expect it on sends	582	// raw sockets deliver the ipv4, but don't expect it on sends
335	// this is slow, but...	583	// this is slow, but...
336	pkt->skip_hdr (IP_OVERHEAD);	584	pkt->skip_hdr (ICMP_OVERHEAD);
		585
		586	recv_vpn_packet (pkt, si);
		587	}
		588	}
		589	else
		590	{
		591	// probably ECONNRESET or somesuch
		592	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		593	}
		594
		595	delete pkt;
		596	}
		597	else
		598	{
		599	slog (L_ERR,
		600	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		601	revents);
		602	exit (EXIT_FAILURE);
		603	}
		604	}
		605	#endif
		606
		607	inline void
		608	vpn::udpv4_ev (ev::io &w, int revents)
		609	{
		610	if (revents & EV_READ)
		611	{
		612	vpn_packet *pkt = new vpn_packet;
		613	struct sockaddr_in sa;
		614	socklen_t sa_len = sizeof (sa);
		615	int len;
		616
		617	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		618
		619	sockinfo si(sa, PROT_UDPv4);
		620
		621	if (len > 0)
		622	{
		623	pkt->len = len;
337		624
338	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
339	}	626	}
340	else	627	else
341	{	628	{
342	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
343	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	630	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
344	}	631	}
345		632
346	delete pkt;	633	delete pkt;
347	}	634	}
348	else if (revents & POLLHUP)
349	{
350	// this cannot ;) happen on udp sockets
351	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
352	exit (1);
353	}
354	else	635	else
355	{	636	{
356	slog (L_ERR,	637	slog (L_ERR,
357	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
358	revents);	639	revents);
359	exit (1);	640	exit (EXIT_FAILURE);
360	}	641	}
361	}	642	}
362		643
363	void	644	inline void
364	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
365	{	646	{
366	if (revents & POLLIN)	647	if (revents & EV_READ)
367	{	648	{
368	/* process data */	649	/* process data */
369	tap_packet *pkt;	650	tap_packet *pkt;
370		651
371	pkt = tap->recv ();	652	pkt = tap->recv ();
372		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
373	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
374	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
375		661
376	if (src != THISNODE->id)	662	if (src != THISNODE->id)
377	{
378	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
379	exit (1);
380	}
381
382	if (dst == THISNODE->id)
383	{
384	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
385	exit (1);
386	}
387
388	if (dst > conns.size ())
389	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
390	else
391	{
392	if (dst)
393	{	663	{
394	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
395	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
396	conns[dst - 1]->inject_data_packet (pkt);
397	}	666	}
		667
		668	if (dst == THISNODE->id)
		669	{
		670	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		671	exit (EXIT_FAILURE);
		672	}
		673
		674	if (dst > conns.size ())
		675	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
398	else	676	else
399	{
400	// broadcast, first check router, then self, then english
401	connection *router = find_router ();
402
403	if (router)
404	router->inject_data_packet (pkt, true);	677	inject_data_packet (pkt, dst);
405	else
406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
407	if ((*c)->conf != THISNODE)
408	(*c)->inject_data_packet (pkt);
409	}
410	}	678	}
411		679
412	delete pkt;	680	delete pkt;
413	}
414	else if (revents & (POLLHUP \| POLLERR))
415	{
416	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
417	exit (1);
418	}	681	}
419	else	682	else
420	abort ();	683	abort ();
421	}	684	}
422		685
423	void	686	inline void
424	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
425	{	688	{
426	if (events)	689	if (events)
427	{	690	{
428	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
429	{	692	{
430	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
431		694
432	shutdown_all ();	695	shutdown_all ();
433
434	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
435
436	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
437		698	exit (EXIT_SUCCESS);
438	exit (0);
439	}	699	}
440		700
441	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
442	{	702	{
443	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
444		704
445	reconnect_all ();	705	reconnect_all ();
446	}	706	}
447		707
448	events = 0;	708	events = 0;
449	}	709	}
450
451	w.at = TSTAMP_CANCEL;
452	}	710	}
453		711
454	void	712	void
455	vpn::shutdown_all ()	713	vpn::shutdown_all ()
456	{	714	{
…		…
469	connection_init ();	727	connection_init ();
470		728
471	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin ();
472	i != conf.nodes.end (); ++i)	730	i != conf.nodes.end (); ++i)
473	{	731	{
474	connection *conn = new connection (this);	732	connection conn = new connection (this, i);
475
476	conn->conf = *i;
477	conns.push_back (conn);	733	conns.push_back (conn);
478
479	conn->establish_connection ();	734	conn->establish_connection ();
480	}	735	}
481	}	736	}
482		737
483	connection *vpn::find_router ()	738	bool vpn::can_direct (conf_node src, conf_node dst) const
484	{	739	{
485	u32 prio = 0;	740	return src != dst
		741	&& src->may_direct (dst)
		742	&& dst->may_direct (src)
		743	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		744	\|\| (src->protocols & dst->connectable_protocols ()));
		745	}
		746
		747	// only works for indirect and routed connections: find a router
		748	// from THISNODE to dst
		749	connection vpn::find_router_for (const connection dst)
		750	{
486	connection *router = 0;	751	connection *router = 0;
487		752
		753	// first try to find a router with a direct connection
		754	{
		755	u32 prio = 1;
		756
		757	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		758	{
		759	connection c = i;
		760
		761	if (c->conf->routerprio > prio
		762	&& c->conf != THISNODE
		763	&& c != dst
		764	&& can_direct (c->conf, dst->conf))
		765	{
		766	if (c->ictx && c->octx)
		767	{
		768	prio = c->conf->routerprio;
		769	router = c;
		770	}
		771	else
		772	c->establish_connection ();
		773	}
		774	}
		775	}
		776
		777	if (router)
		778	return router;
		779
		780	// second try find the router with the highest priority higher than ours
		781	{
		782	u32 prio = 1;
		783
		784	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		785	{
		786	connection c = i;
		787
		788	if (c->conf->routerprio > prio
		789	&& c->conf->routerprio > THISNODE->routerprio
		790	&& c != dst
		791	&& c->conf != THISNODE)
		792	{
		793	if (c->ictx && c->octx)
		794	{
		795	prio = c->conf->routerprio;
		796	router = c;
		797	}
		798	else
		799	c->establish_connection ();
		800	}
		801	}
		802	}
		803	return router;
		804	}
		805
		806	void vpn::connection_established (connection *c)
		807	{
488	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	808	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489	{	809	{
490	connection c = i;	810	connection o = i;
491		811
492	if (c->conf->routerprio > prio	812	if (!o->is_direct
493	&& c->connectmode == conf_node::C_ALWAYS	813	&& o->si.valid ()
494	&& c->conf != THISNODE	814	&& c->si != o->si
495	&& c->ictx && c->octx)	815	&& c == find_router_for (o))
496	{
497	prio = c->conf->routerprio;
498	router = c;
499	}	816	{
		817	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		818	o->conf->nodename, c->conf->nodename);
		819	o->rekey ();
		820	}
500	}	821	}
501
502	return router;
503	}	822	}
504		823
505	void vpn::send_connect_request (int id)	824	void vpn::send_connect_request (int id)
506	{	825	{
507	connection *c = find_router ();	826	connection *c = find_router_for (conns[id]);
508		827
509	if (c)	828	if (c)
		829	{
		830	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		831	conns[id]->conf->nodename, c->conf->nodename);
510	c->send_connect_request (id);	832	c->send_connect_request (id);
		833	}
511	else	834	else
512	// no router found, aggressively connect to all routers	835	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), conns[id]->conf->nodename);
513	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
514	if ((*i)->conf->routerprio)
515	(*i)->establish_connection ();
516	}	836	}
517		837
518	void	838	void
519	connection::dump_status ()	839	connection::dump_status ()
520	{	840	{
521	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	841	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
522	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	842	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
523	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	843	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
524	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	844	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
525	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	845	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
526	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
527	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
528	}	846	}
529		847
530	void	848	void
531	vpn::dump_status ()	849	vpn::dump_status ()
532	{	850	{
533	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	851	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
534		852
535	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	853	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
536	(*c)->dump_status ();	854	(*c)->dump_status ();
537		855
538	slog (L_NOTICE, _("END status dump"));	856	slog (L_NOTICE, _("END status dump"));
539	}	857	}
540		858
541	vpn::vpn (void)	859	vpn::vpn (void)
542	: event(this, &vpn::event_cb)	860	{
		861	event .set<vpn, &vpn::event_cb > (this);
543	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	862	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
544	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	863	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
545	, tap_ev_watcher (this, &vpn::tap_ev)
546	#if ENABLE_TCP	864	#if ENABLE_TCP
547	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	865	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
548	#endif	866	#endif
549	{	867	#if ENABLE_ICMP
		868	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		869	#endif
		870	#if ENABLE_DNS
		871	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		872	#endif
		873	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
550	}	874	}
551		875
552	vpn::~vpn ()	876	vpn::~vpn ()
553	{	877	{
554	}	878	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs. Revision 1.49 by pcg, Sun Aug 10 01:34:36 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.49 by pcg, Sun Aug 10 01:34:36 2008 UTC