[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 1.50 by pcg, Sun Aug 10 02:49:21 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	udpv4_fd = -1;	128	ipv4_fd = -1;
77		129
78	if (THISNODE->protocols & PROT_UDPv4)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	131	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		133
82	if (udpv4_fd < 0)	134	if (ipv4_fd < 0)
83	return -1;	135	return -1;
84		136
85	// standard daemon practise...	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
86	{	138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
87	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}
90		139
91	sockinfo si (THISNODE, PROT_UDPv4);	140	#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	141	// this I really consider a linux bug. I am neither connected
101	// 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
102	// fragment for me sometimes.	143	// fragment for me sometimes.
103	{	144	{
104	int oval = IP_PMTUDISC_DONT;	145	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	146	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		147	}
		148	#endif
		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);
106	}	156	}
107	#endif
108		157
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
110	}	159	}
111		160
		161	udpv4_tos = -1;
112	ipv4_fd = -1;	162	udpv4_fd = -1;
113	if (THISNODE->protocols & PROT_IPv4)
114	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
116		163
		164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		165	{
		166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		167
117	if (ipv4_fd < 0)	168	if (udpv4_fd < 0)
118	return -1;	169	return -1;
119		170
120	sockinfo si (THISNODE, PROT_IPv4);	171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
121		173
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	174	// standard daemon practise...
123	{	175	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	176	int oval = 1;
125	exit (1);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
126	}	178	}
127		179
128	#ifdef IP_MTU_DISCOVER	180	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	181	// this I really consider a linux bug. I am neither connected
130	// 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
131	// fragment for me sometimes.	183	// fragment for me sometimes.
132	{	184	{
133	int oval = IP_PMTUDISC_DONT;	185	int oval = IP_PMTUDISC_DONT;
		186	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		187	}
		188	#endif
		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
		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);
		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;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	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);
135	}	242	}
136	#endif
137		243
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
139	}	245	}
		246	#endif
		247
		248	tcpv4_fd = -1;
140		249
141	#if ENABLE_TCP	250	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	251	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	252	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	253	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		254
146	if (tcpv4_fd < 0)	255	if (tcpv4_fd < 0)
147	return -1;	256	return -1;
148		257
		258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		260
149	// standard daemon practise...	261	// standard daemon practise...
150	{	262	{
151	int oval = 1;	263	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
153	}	265	}
154		266
155	sockinfo si (THISNODE, PROT_TCPv4);	267	sockinfo si (THISNODE, PROT_TCPv4);
156		268
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	270	{
159	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));
160	exit (1);	272	exit (EXIT_FAILURE);
161	}	273	}
162		274
163	if (listen (tcpv4_fd, 5))	275	if (listen (tcpv4_fd, 5))
164	{	276	{
165	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));
166	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);
167	}	308	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#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	/////////////////////////////////////////////////////////////////////////////
172		336
173	tap = new tap_device ();	337	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
175	{	339	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
177	exit (1);	341	exit (EXIT_FAILURE);
178	}	342	}
179		343
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
181		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
182	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		365
186	return 0;	366	return 0;
187	}	367	}
188		368
189	// send a vpn packet out to other hosts	369	bool
		370	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		371	{
		372	set_tos (ipv4_fd, ipv4_tos, tos);
		373	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		374
		375	return true;
		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
		419
		420	bool
		421	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		422	{
		423	set_tos (udpv4_fd, udpv4_tos, tos);
		424	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		425
		426	return true;
		427	}
		428
190	void	429	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	430	vpn::inject_data_packet (tap_packet *pkt, int dst)
192	{	431	{
193	switch (si.prot)	432	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	}	433	{
213	}	434	// unicast
214		435	if (dst != THISNODE->id)
215	void	436	conns[dst - 1]->inject_data_packet (pkt);
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	437	}
217	{	438	else
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	439	{
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	440	// broadcast, this is ugly, but due to the security policy
220	}	441	// we have to connect to all hosts...
221		442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
222	void	443	if ((*c)->conf != THISNODE)
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	444	(*c)->inject_data_packet (pkt);
224	{	445	}
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	}	446	}
228		447
229	void	448	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	450	{
232	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
233	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
234		453
235	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."),
236	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
237		456
238	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	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)."),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else if (dst > conns.size ())	462	else if (dst > conns.size ())
244	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)."),
245	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
246	else	465	else
247	{	466	{
248	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
249		468
250	if (dst == 0 && !THISNODE->routerprio)	469	if (dst == 0)
251	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
252	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
253	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
254	{	473	{
255	if (THISNODE->routerprio)	474	if (THISNODE->routerprio)
256	// the tos setting gets lost here. who cares.	475	// the tos setting gets lost here. who cares.
257	conns[dst - 1]->inject_vpn_packet (pkt);	476	conns[dst - 1]->inject_vpn_packet (pkt);
258	else	477	else
259	slog (L_WARN,	478	slog (L_WARN,
260	_("%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?)."),
261	c->conf->nodename, (const char *)rsi,	480	c->conf->nodename, (const char *)rsi,
262	conns[dst - 1]->conf->nodename);	481	conns[dst - 1]->conf->nodename);
263	}	482	}
264	else	483	else
265	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
266	}	485	}
267	}	486	}
268		487
269	void	488	bool
270	vpn::udpv4_ev (io_watcher &w, short revents)	489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
271	{	490	{
272	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)
273	{	522	{
274	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
275	struct sockaddr_in sa;	524	struct sockaddr_in sa;
276	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
277	int len;	526	int len;
278		527
279	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);
280		529
281	sockinfo si(sa, PROT_UDPv4);	530	sockinfo si(sa, PROT_IPv4);
282		531
283	if (len > 0)	532	if (len > 0)
284	{	533	{
285	pkt->len = len;	534	pkt->len = len;
286		535
		536	// raw sockets deliver the ipv4 header, but don't expect it on sends
		537	pkt->skip_hdr (IP_OVERHEAD);
		538
287	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
288	}	540	}
289	else	541	else
290	{	542	{
291	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
292	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));
293	}	545	}
294		546
295	delete pkt;	547	delete pkt;
296	}	548	}
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	549	else
304	{	550	{
305	slog (L_ERR,	551	slog (L_ERR,
306	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
307	revents);	553	revents);
308	exit (1);	554	exit (EXIT_FAILURE);
309	}	555	}
310	}	556	}
311		557
312	void	558	#if ENABLE_ICMP
		559	inline void
313	vpn::ipv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
314	{	561	{
315	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
316	{	563	{
317	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
318	struct sockaddr_in sa;	565	struct sockaddr_in sa;
319	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
320	int len;	567	int len;
321		568
322	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);
323		570
324	sockinfo si(sa, PROT_IPv4);	571	sockinfo si(sa, PROT_ICMPv4);
325		572
326	if (len > 0)	573	if (len > 0)
327	{	574	{
328	pkt->len = len;	575	pkt->len = len;
329		576
		577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		578
		579	if (hdr->type == ::conf.icmp_type
		580	&& hdr->code == 255)
		581	{
330	// 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
331	// this is slow, but...	583	// this is slow, but...
332	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;
333		624
334	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
335	}	626	}
336	else	627	else
337	{	628	{
338	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
339	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));
340	}	631	}
341		632
342	delete pkt;	633	delete pkt;
343	}	634	}
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	635	else
351	{	636	{
352	slog (L_ERR,	637	slog (L_ERR,
353	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
354	revents);	639	revents);
355	exit (1);	640	exit (EXIT_FAILURE);
356	}	641	}
357	}	642	}
358		643
359	void	644	inline void
360	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
361	{	646	{
362	if (revents & POLLIN)	647	if (revents & EV_READ)
363	{	648	{
364	/* process data */	649	/* process data */
365	tap_packet *pkt;	650	tap_packet *pkt;
366		651
367	pkt = tap->recv ();	652	pkt = tap->recv ();
368		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
369	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
370	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
371		661
372	if (src != THISNODE->id)	662	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	{	663	{
390	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
391	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
392	conns[dst - 1]->inject_data_packet (pkt);
393	}	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);
394	else	676	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);	677	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	}	678	}
407		679
408	delete pkt;	680	delete pkt;
409	}
410	else if (revents & (POLLHUP \| POLLERR))
411	{
412	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
413	exit (1);
414	}	681	}
415	else	682	else
416	abort ();	683	abort ();
417	}	684	}
418		685
419	void	686	inline void
420	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
421	{	688	{
422	if (events)	689	if (events)
423	{	690	{
424	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
425	{	692	{
426	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
427		694
428	shutdown_all ();	695	shutdown_all ();
429
430	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
431
432	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
433		698	exit (EXIT_SUCCESS);
434	exit (0);
435	}	699	}
436		700
437	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
438	{	702	{
439	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
440		704
441	reconnect_all ();	705	reconnect_all ();
442	}	706	}
443		707
444	events = 0;	708	events = 0;
445	}	709	}
446
447	w.at = TSTAMP_CANCEL;
448	}	710	}
449		711
450	void	712	void
451	vpn::shutdown_all ()	713	vpn::shutdown_all ()
452	{	714	{
462		724
463	conns.clear ();	725	conns.clear ();
464		726
465	connection_init ();	727	connection_init ();
466		728
467	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
468	i != conf.nodes.end (); ++i)	730	conns.push_back (new connection (this, *i));
469	{
470	connection *conn = new connection (this);
471		731
472	conn->conf = *i;	732	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
473	conns.push_back (conn);
474
475	conn->establish_connection ();	733	(*c)->establish_connection ();
476	}
477	}	734	}
478		735
479	connection *vpn::find_router ()	736	bool vpn::can_direct (conf_node src, conf_node dst) const
480	{	737	{
481	u32 prio = 0;	738	return src != dst
		739	&& src->may_direct (dst)
		740	&& dst->may_direct (src)
		741	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		742	\|\| (src->protocols & dst->connectable_protocols ()));
		743	}
		744
		745	// only works for indirect and routed connections: find a router
		746	// from THISNODE to dst
		747	connection vpn::find_router_for (const connection dst)
		748	{
482	connection *router = 0;	749	connection *router = 0;
483		750
		751	// first try to find a router with a direct connection
		752	{
		753	u32 prio = 1;
		754
		755	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		756	{
		757	connection c = i;
		758
		759	if (c->conf->routerprio > prio
		760	&& c->conf != THISNODE
		761	&& c != dst
		762	&& can_direct (c->conf, dst->conf))
		763	{
		764	if (c->ictx && c->octx)
		765	{
		766	prio = c->conf->routerprio;
		767	router = c;
		768	}
		769	else
		770	c->establish_connection ();
		771	}
		772	}
		773	}
		774
		775	if (router)
		776	return router;
		777
		778	// second try find the router with the highest priority higher than ours
		779	{
		780	u32 prio = 1;
		781
		782	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		783	{
		784	connection c = i;
		785
		786	if (c->conf->routerprio > prio
		787	&& c->conf->routerprio > THISNODE->routerprio
		788	&& c != dst
		789	&& c->conf != THISNODE)
		790	{
		791	if (c->ictx && c->octx)
		792	{
		793	prio = c->conf->routerprio;
		794	router = c;
		795	}
		796	else
		797	c->establish_connection ();
		798	}
		799	}
		800	}
		801	return router;
		802	}
		803
		804	void vpn::connection_established (connection *c)
		805	{
484	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	806	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
485	{	807	{
486	connection c = i;	808	connection o = i;
487		809
488	if (c->conf->routerprio > prio	810	if (!o->is_direct
489	&& c->connectmode == conf_node::C_ALWAYS	811	&& o->si.valid ()
490	&& c->conf != THISNODE	812	&& c->si != o->si
491	&& c->ictx && c->octx)	813	&& c == find_router_for (o))
492	{
493	prio = c->conf->routerprio;
494	router = c;
495	}	814	{
		815	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		816	o->conf->nodename, c->conf->nodename);
		817	o->rekey ();
		818	}
496	}	819	}
497
498	return router;
499	}	820	}
500		821
501	void vpn::connect_request (int id)	822	void vpn::send_connect_request (connection *c)
502	{	823	{
503	connection *c = find_router ();	824	connection *r = find_router_for (c);
504		825
505	if (c)	826	if (r)
		827	{
		828	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		829	c->conf->nodename, r->conf->nodename);
506	c->connect_request (id);	830	r->send_connect_request (c->conf->id);
507	//else // does not work, because all others must connect to the same router	831	}
508	// // no router found, aggressively connect to all routers	832	else
509	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	833	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
510	// if ((*i)->conf->routerprio)	834	c->conf->nodename);
511	// (*i)->establish_connection ();
512	}	835	}
513		836
514	void	837	void
515	connection::dump_status ()	838	connection::dump_status ()
516	{	839	{
517	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	840	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
518	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	841	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
519	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	842	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
520	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	843	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
521	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	844	(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	}	845	}
525		846
526	void	847	void
527	vpn::dump_status ()	848	vpn::dump_status ()
528	{	849	{
529	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	850	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
530		851
531	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	852	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
532	(*c)->dump_status ();	853	(*c)->dump_status ();
533		854
534	slog (L_NOTICE, _("END status dump"));	855	slog (L_NOTICE, _("END status dump"));
535	}	856	}
536		857
537	vpn::vpn (void)	858	vpn::vpn (void)
538	: event(this, &vpn::event_cb)	859	{
		860	event .set<vpn, &vpn::event_cb > (this);
539	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	861	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
540	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	862	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
541	, tap_ev_watcher (this, &vpn::tap_ev)
542	#if ENABLE_TCP	863	#if ENABLE_TCP
543	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	864	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
544	#endif	865	#endif
545	{	866	#if ENABLE_ICMP
		867	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		868	#endif
		869	#if ENABLE_DNS
		870	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		871	#endif
		872	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
546	}	873	}
547		874
548	vpn::~vpn ()	875	vpn::~vpn ()
549	{	876	{
550	}	877	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC