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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 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	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)."),
		461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		462	else if (dst > conns.size ())
		463	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	465	else
244	{	466	{
245	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
246		468
247	if (dst == 0 && !THISNODE->routerprio)	469	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
249	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	473	{
		474	if (THISNODE->routerprio)
		475	// the tos setting gets lost here. who cares.
		476	conns[dst - 1]->inject_vpn_packet (pkt);
		477	else
252	slog (L_WARN,	478	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	479	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		480	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	481	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	482	}
256	THISNODE->id, THISNODE->nodename);
257	else	483	else
258	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
259	}	485	}
260	}	486	}
261		487
262	void	488	bool
263	vpn::udpv4_ev (io_watcher &w, short revents)	489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
264	{	490	{
265	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)
266	{	522	{
267	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	524	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
270	int len;	526	int len;
271		527
272	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);
273		529
274	sockinfo si(sa, PROT_UDPv4);	530	sockinfo si(sa, PROT_IPv4);
275		531
276	if (len > 0)	532	if (len > 0)
277	{	533	{
278	pkt->len = len;	534	pkt->len = len;
279		535
		536	// raw sockets deliver the ipv4 header, but don't expect it on sends
		537	pkt->skip_hdr (IP_OVERHEAD);
		538
280	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
281	}	540	}
282	else	541	else
283	{	542	{
284	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
285	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));
286	}	545	}
287		546
288	delete pkt;	547	delete pkt;
289	}	548	}
290	else if (revents & POLLHUP)
291	{
292	// this cannot ;) happen on udp sockets
293	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
294	exit (1);
295	}
296	else	549	else
297	{	550	{
298	slog (L_ERR,	551	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
300	revents);	553	revents);
301	exit (1);	554	exit (EXIT_FAILURE);
302	}	555	}
303	}	556	}
304		557
305	void	558	#if ENABLE_ICMP
		559	inline void
306	vpn::ipv4_ev (io_watcher &w, short revents)	560	vpn::icmpv4_ev (ev::io &w, int revents)
307	{	561	{
308	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
309	{	563	{
310	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	565	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
313	int len;	567	int len;
314		568
315	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);
316		570
317	sockinfo si(sa, PROT_IPv4);	571	sockinfo si(sa, PROT_ICMPv4);
318		572
319	if (len > 0)	573	if (len > 0)
320	{	574	{
321	pkt->len = len;	575	pkt->len = len;
322		576
		577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		578
		579	if (hdr->type == ::conf.icmp_type
		580	&& hdr->code == 255)
		581	{
323	// 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
324	// this is slow, but...	583	// this is slow, but...
325	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;
326		624
327	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
328	}	626	}
329	else	627	else
330	{	628	{
331	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
332	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));
333	}	631	}
334		632
335	delete pkt;	633	delete pkt;
336	}	634	}
337	else if (revents & POLLHUP)
338	{
339	// this cannot ;) happen on udp sockets
340	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
341	exit (1);
342	}
343	else	635	else
344	{	636	{
345	slog (L_ERR,	637	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
347	revents);	639	revents);
348	exit (1);	640	exit (EXIT_FAILURE);
349	}	641	}
350	}	642	}
351		643
352	void	644	inline void
353	vpn::tap_ev (io_watcher &w, short revents)	645	vpn::tap_ev (ev::io &w, int revents)
354	{	646	{
355	if (revents & POLLIN)	647	if (revents & EV_READ)
356	{	648	{
357	/* process data */	649	/* process data */
358	tap_packet *pkt;	650	tap_packet *pkt;
359		651
360	pkt = tap->recv ();	652	pkt = tap->recv ();
361		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
362	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
364		661
365	if (src != THISNODE->id)	662	if (src != THISNODE->id)
366	{
367	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
368	exit (1);
369	}
370
371	if (dst == THISNODE->id)
372	{
373	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
374	exit (1);
375	}
376
377	if (dst > conns.size ())
378	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
379	else
380	{
381	if (dst)
382	{	663	{
383	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
384	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	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);
387	else	676	else
388	{
389	// broadcast, first check router, then self, then english
390	connection *router = find_router ();
391
392	if (router)
393	router->inject_data_packet (pkt, true);	677	inject_data_packet (pkt, dst);
394	else
395	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
396	if ((*c)->conf != THISNODE)
397	(*c)->inject_data_packet (pkt);
398	}
399	}	678	}
400		679
401	delete pkt;	680	delete pkt;
402	}
403	else if (revents & (POLLHUP \| POLLERR))
404	{
405	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
406	exit (1);
407	}	681	}
408	else	682	else
409	abort ();	683	abort ();
410	}	684	}
411		685
412	void	686	inline void
413	vpn::event_cb (time_watcher &w)	687	vpn::event_cb (ev::timer &w, int)
414	{	688	{
415	if (events)	689	if (events)
416	{	690	{
417	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
418	{	692	{
419	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
420		694
421	shutdown_all ();	695	shutdown_all ();
422
423	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
426		698	exit (EXIT_SUCCESS);
427	exit (0);
428	}	699	}
429		700
430	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
431	{	702	{
432	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
433		704
434	reconnect_all ();	705	reconnect_all ();
435	}	706	}
436		707
437	events = 0;	708	events = 0;
438	}	709	}
439
440	w.at = TSTAMP_CANCEL;
441	}	710	}
442		711
443	void	712	void
444	vpn::shutdown_all ()	713	vpn::shutdown_all ()
445	{	714	{
458	connection_init ();	727	connection_init ();
459		728
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin ();
461	i != conf.nodes.end (); ++i)	730	i != conf.nodes.end (); ++i)
462	{	731	{
463	connection *conn = new connection (this);	732	connection conn = new connection (this, i);
464
465	conn->conf = *i;
466	conns.push_back (conn);	733	conns.push_back (conn);
467
468	conn->establish_connection ();	734	conn->establish_connection ();
469	}	735	}
470	}	736	}
471		737
472	connection *vpn::find_router ()	738	bool vpn::can_direct (conf_node src, conf_node dst) const
473	{	739	{
474	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	{
475	connection *router = 0;	751	connection *router = 0;
476		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	{
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	808	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	809	{
479	connection c = i;	810	connection o = i;
480		811
481	if (c->conf->routerprio > prio	812	if (!o->is_direct
482	&& c->connectmode == conf_node::C_ALWAYS	813	&& o->si.valid ()
483	&& c->conf != THISNODE	814	&& c->si != o->si
484	&& c->ictx && c->octx)	815	&& c == find_router_for (o))
485	{
486	prio = c->conf->routerprio;
487	router = c;
488	}	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	}
489	}	821	}
490
491	return router;
492	}	822	}
493		823
494	void vpn::connect_request (int id)	824	void vpn::send_connect_request (int id)
495	{	825	{
496	connection *c = find_router ();	826	connection *c = find_router_for (conns[id]);
497		827
498	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);
499	c->connect_request (id);	832	c->send_connect_request (id);
500	//else // does not work, because all others must connect to the same router	833	}
501	// // no router found, aggressively connect to all routers	834	else
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	835	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), conns[id]->conf->nodename);
503	// if ((*i)->conf->routerprio)
504	// (*i)->establish_connection ();
505	}	836	}
506		837
507	void	838	void
508	connection::dump_status ()	839	connection::dump_status ()
509	{	840	{
510	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	841	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
511	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	842	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
512	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	843	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
513	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"),
514	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	845	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
515	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
516	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
517	}	846	}
518		847
519	void	848	void
520	vpn::dump_status ()	849	vpn::dump_status ()
521	{	850	{
522	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	851	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
523		852
524	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	853	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
525	(*c)->dump_status ();	854	(*c)->dump_status ();
526		855
527	slog (L_NOTICE, _("END status dump"));	856	slog (L_NOTICE, _("END status dump"));
528	}	857	}
529		858
530	vpn::vpn (void)	859	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	860	{
		861	event .set<vpn, &vpn::event_cb > (this);
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	862	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	863	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	864	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	865	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
537	#endif	866	#endif
538	{	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);
539	}	874	}
540		875
541	vpn::~vpn ()	876	vpn::~vpn ()
542	{	877	{
543	}	878	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.5 by pcg, Sat Apr 5 02:32:40 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 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.49 by pcg, Sun Aug 10 01:34:36 2008 UTC