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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.56 by root, Tue Feb 8 23:11:36 2011 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;
		122	}
		123
		124	int
		125	vpn::setup_socket (u8 prot, int family, int type, int proto)
		126	{
		127	int fd = socket (family, type, proto);
		128
		129	if (fd < 0)
		130	{
		131	slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
		132	return fd;
		133	}
		134
		135	fcntl (fd, F_SETFL, O_NONBLOCK);
		136	fcntl (fd, F_SETFD, FD_CLOEXEC);
		137
		138	#ifdef SO_MARK
		139	if (::conf.nfmark)
		140	if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark))
		141	slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno));
		142	#endif
		143
		144	return fd;
71	}	145	}
72		146
73	int	147	int
74	vpn::setup ()	148	vpn::setup ()
75	{	149	{
		150	int success = 0;
		151
		152	ipv4_tos = -1;
		153	ipv4_fd = -1;
		154
		155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		156	{
		157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
		158
		159	if (ipv4_fd < 0)
		160	return -1;
		161
		162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		163	// this I really consider a linux bug. I am neither connected
		164	// nor do I fragment myself. Linux still sets DF and doesn't
		165	// fragment for me sometimes.
		166	{
		167	int oval = IP_PMTUDISC_DONT;
		168	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		169	}
		170	#endif
		171
		172	sockinfo si (THISNODE, PROT_IPv4);
		173
		174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		175	{
		176	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		177	return -1;
		178	}
		179
		180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
		182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
		185
		186	udpv4_tos = -1;
76	udpv4_fd = -1;	187	udpv4_fd = -1;
77		188
78	if (THISNODE->protocols & PROT_UDPv4)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	190	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		192
82	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
83	return -1;	194	return -1;
84		195
85	// standard daemon practise...	196	// standard daemon practise...
86	{	197	{
87	int oval = 1;	198	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	200	}
90		201
91	sockinfo si (THISNODE, PROT_UDPv4);	202	#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	203	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	204	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	205	// fragment for me sometimes.
103	{	206	{
104	int oval = IP_PMTUDISC_DONT;	207	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	208	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	209	}
107	#endif	210	#endif
108		211
		212	sockinfo si (THISNODE, PROT_UDPv4);
		213
		214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		215	{
		216	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		217	return -1;
		218	}
		219
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
110	}	222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
111		225
		226	icmpv4_tos = -1;
112	ipv4_fd = -1;	227	icmpv4_fd = -1;
		228
		229	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	230	if (THISNODE->protocols & PROT_ICMPv4)
114	{	231	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		233
117	if (ipv4_fd < 0)	234	if (icmpv4_fd < 0)
118	return -1;	235	return -1;
119		236
120	sockinfo si (THISNODE, PROT_IPv4);	237	#ifdef ICMP_FILTER
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{	238	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	239	icmp_filter oval;
125	exit (1);	240	oval.data = 0xffffffff;
		241	if (::conf.icmp_type < 32)
		242	oval.data &= ~(1 << ::conf.icmp_type);
		243
		244	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	245	}
		246	#endif
127		247
128	#ifdef IP_MTU_DISCOVER	248	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	249	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	250	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	251	// fragment for me sometimes.
132	{	252	{
133	int oval = IP_PMTUDISC_DONT;	253	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	255	}
136	#endif	256	#endif
137		257
		258	sockinfo si (THISNODE, PROT_ICMPv4);
		259
		260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		261	{
		262	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		263	return -1;
		264	}
		265
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
139	}	268	}
		269	#endif
		270
		271	tcpv4_fd = -1;
140		272
141	#if ENABLE_TCP	273	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	275	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		277
146	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
147	return -1;	279	return -1;
148		280
149	// standard daemon practise...	281	// standard daemon practise...
154		286
155	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
156		288
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	290	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	291	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
160	exit (1);	292	return -1;
161	}	293	}
162		294
163	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
164	{	296	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	297	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
166	exit (1);	298	return -1;
		299	}
		300
		301	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		302	++success;
		303	}
		304	else
		305	THISNODE->protocols &= ~PROT_TCPv4;
		306	#endif
		307
		308	dnsv4_tos = -1;
		309	dnsv4_fd = -1;
		310
		311	#if ENABLE_DNS
		312	if (THISNODE->protocols & PROT_DNSv4)
		313	{
		314	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		315
		316	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		317
		318	if (dnsv4_fd < 0)
		319	return -1;
		320
		321	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		322	// this I really consider a linux bug. I am neither connected
		323	// nor do I fragment myself. Linux still sets DF and doesn't
		324	// fragment for me sometimes.
		325	{
		326	int oval = IP_PMTUDISC_DONT;
		327	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
167	}	328	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#endif	329	# endif
		330
		331	// standard daemon practise...
		332	{
		333	int oval = 1;
		334	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		335	}
		336
		337	sockinfo si (THISNODE->dns_hostname,
		338	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		339	PROT_DNSv4);
		340
		341	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		342	{
		343	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		344	return -1;
		345	}
		346
		347	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		348	++success;
		349	}
		350	#endif
		351
		352	/////////////////////////////////////////////////////////////////////////////
		353
		354	if (!success)
		355	{
		356	slog (L_ERR, _("no protocols enabled."));
		357	return -1;
		358	}
		359
		360	reconnect_all ();
		361
		362	/////////////////////////////////////////////////////////////////////////////
172		363
173	tap = new tap_device ();	364	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
175	{	366	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
177	exit (1);	368	return -1;
178	}	369	}
179		370
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
181		372
		373	run_script_cb cb;
		374	cb.set<vpn, &vpn::script_if_init> (this);
		375
		376	if (tap->if_up () &&
		377	!run_script (cb, true))
		378	{
		379	slog (L_ERR, _("interface initialization command '%s' failed."),
		380	tap->if_up ());
		381	return -1;
		382	}
		383
		384	cb.set<vpn, &vpn::script_if_up> (this);
		385	if (!run_script (cb, true))
		386	{
		387	slog (L_ERR, _("if-up command execution failed."));
		388	return -1;
		389	}
		390
182	tap_ev_watcher.start (tap->fd, POLLIN);	391	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		392
186	return 0;	393	return 0;
187	}
188
189	// send a vpn packet out to other hosts
190	bool
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	return send_ipv4_packet (pkt, si, tos);
197
198	case PROT_UDPv4:
199	return send_udpv4_packet (pkt, si, tos);
200
201	#if ENABLE_TCP
202	case PROT_TCPv4:
203	return send_tcpv4_packet (pkt, si, tos);
204	#endif
205
206	default:
207	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
208	return false;
209	}
210	}	394	}
211		395
212	bool	396	bool
213	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	397	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
214	{	398	{
215	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	399	set_tos (ipv4_fd, ipv4_tos, tos);
216	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	400	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
217		401
218	return true;	402	return true;
219	}	403	}
		404
		405	static u16
		406	ipv4_checksum (u16 *data, unsigned int len)
		407	{
		408	// use 32 bit accumulator and fold back carry bits at the end
		409	u32 sum = 0;
		410
		411	while (len > 1)
		412	{
		413	sum += *data++;
		414	len -= 2;
		415	}
		416
		417	// odd byte left?
		418	if (len)
		419	sum += (u8 )data;
		420
		421	// add back carry bits
		422	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		423	sum += (sum >> 16); // carry
		424
		425	return ~sum;
		426	}
		427
		428	#if ENABLE_ICMP
		429	bool
		430	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		431	{
		432	pkt->unshift_hdr (4);
		433
		434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		435	hdr->type = ::conf.icmp_type;
		436	hdr->code = 255;
		437	hdr->checksum = 0;
		438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
		441	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		442
		443	return true;
		444	}
		445	#endif
220		446
221	bool	447	bool
222	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	448	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
223	{	449	{
224	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	450	set_tos (udpv4_fd, udpv4_tos, tos);
225	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	451	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
226		452
227	return true;	453	return true;
		454	}
		455
		456	void
		457	vpn::inject_data_packet (tap_packet *pkt, int dst)
		458	{
		459	if (dst)
		460	{
		461	// unicast
		462	if (dst != THISNODE->id)
		463	conns[dst - 1]->inject_data_packet (pkt);
		464	}
		465	else
		466	{
		467	// broadcast, this is ugly, but due to the security policy
		468	// we have to connect to all hosts...
		469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		470	if ((*c)->conf != THISNODE)
		471	(*c)->inject_data_packet (pkt);
		472	}
228	}	473	}
229		474
230	void	475	void
231	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
232	{	477	{
233	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
234	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
235		480
236	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	481	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
237	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
238		483
239	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
240	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
241	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
242	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	487	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
243	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
244	else if (dst > conns.size ())	489	else if (dst > conns.size ())
245	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	490	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else	492	else
248	{	493	{
249	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
250		495
251	if (dst == 0 && !THISNODE->routerprio)	496	if (dst == 0)
252	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
253	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
254	else if (dst != 0 && dst != THISNODE->id)	499	else if (dst != THISNODE->id)
255	{	500	{
256	if (THISNODE->routerprio)	501	if (THISNODE->routerprio)
257	// the tos setting gets lost here. who cares.	502	// the tos setting gets lost here. who cares.
258	conns[dst - 1]->inject_vpn_packet (pkt);	503	conns[dst - 1]->inject_vpn_packet (pkt);
259	else	504	else
260	slog (L_WARN,	505	slog (L_WARN,
261	_("%s(%s): forwarding request (=> %s), but we are no router"),	506	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
262	c->conf->nodename, (const char *)rsi,	507	c->conf->nodename, (const char *)rsi,
263	conns[dst - 1]->conf->nodename);	508	conns[dst - 1]->conf->nodename);
264	}	509	}
265	else	510	else
266	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
267	}	512	}
268	}	513	}
269		514
270	void	515	bool
271	vpn::udpv4_ev (io_watcher &w, short revents)	516	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
272	{	517	{
273	if (revents & (POLLIN \| POLLERR))	518	switch (si.prot)
		519	{
		520	case PROT_IPv4:
		521	return send_ipv4_packet (pkt, si, tos);
		522
		523	case PROT_UDPv4:
		524	return send_udpv4_packet (pkt, si, tos);
		525
		526	#if ENABLE_TCP
		527	case PROT_TCPv4:
		528	return send_tcpv4_packet (pkt, si, tos);
		529	#endif
		530	#if ENABLE_ICMP
		531	case PROT_ICMPv4:
		532	return send_icmpv4_packet (pkt, si, tos);
		533	#endif
		534	#if ENABLE_DNS
		535	case PROT_DNSv4:
		536	return send_dnsv4_packet (pkt, si, tos);
		537	#endif
		538	default:
		539	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		540	}
		541
		542	return false;
		543	}
		544
		545	inline void
		546	vpn::ipv4_ev (ev::io &w, int revents)
		547	{
		548	if (revents & EV_READ)
274	{	549	{
275	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
276	struct sockaddr_in sa;	551	struct sockaddr_in sa;
277	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
278	int len;	553	int len;
279		554
280	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	555	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
281		556
282	sockinfo si(sa, PROT_UDPv4);	557	sockinfo si(sa, PROT_IPv4);
283		558
284	if (len > 0)	559	if (len > 0)
285	{	560	{
286	pkt->len = len;	561	pkt->len = len;
287		562
		563	// raw sockets deliver the ipv4 header, but don't expect it on sends
		564	pkt->skip_hdr (IP_OVERHEAD);
		565
288	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
289	}	567	}
290	else	568	else
291	{	569	{
292	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
293	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	571	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
294	}	572	}
295		573
296	delete pkt;	574	delete pkt;
297	}	575	}
298	else if (revents & POLLHUP)
299	{
300	// this cannot ;) happen on udp sockets
301	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
302	exit (1);
303	}
304	else	576	else
305	{	577	{
306	slog (L_ERR,	578	slog (L_ERR,
307	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
308	revents);	580	revents);
309	exit (1);	581	exit (EXIT_FAILURE);
310	}	582	}
311	}	583	}
312		584
313	void	585	#if ENABLE_ICMP
		586	inline void
314	vpn::ipv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
315	{	588	{
316	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
317	{	590	{
318	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
319	struct sockaddr_in sa;	592	struct sockaddr_in sa;
320	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
321	int len;	594	int len;
322		595
323	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	596	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
324		597
325	sockinfo si(sa, PROT_IPv4);	598	sockinfo si(sa, PROT_ICMPv4);
326		599
327	if (len > 0)	600	if (len > 0)
328	{	601	{
329	pkt->len = len;	602	pkt->len = len;
330		603
		604	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		605
		606	if (hdr->type == ::conf.icmp_type
		607	&& hdr->code == 255)
		608	{
331	// raw sockets deliver the ipv4, but don't expect it on sends	609	// raw sockets deliver the ipv4, but don't expect it on sends
332	// this is slow, but...	610	// this is slow, but...
333	pkt->skip_hdr (IP_OVERHEAD);	611	pkt->skip_hdr (ICMP_OVERHEAD);
		612
		613	recv_vpn_packet (pkt, si);
		614	}
		615	}
		616	else
		617	{
		618	// probably ECONNRESET or somesuch
		619	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		620	}
		621
		622	delete pkt;
		623	}
		624	else
		625	{
		626	slog (L_ERR,
		627	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		628	revents);
		629	exit (EXIT_FAILURE);
		630	}
		631	}
		632	#endif
		633
		634	inline void
		635	vpn::udpv4_ev (ev::io &w, int revents)
		636	{
		637	if (revents & EV_READ)
		638	{
		639	vpn_packet *pkt = new vpn_packet;
		640	struct sockaddr_in sa;
		641	socklen_t sa_len = sizeof (sa);
		642	int len;
		643
		644	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		645
		646	sockinfo si(sa, PROT_UDPv4);
		647
		648	if (len > 0)
		649	{
		650	pkt->len = len;
334		651
335	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
336	}	653	}
337	else	654	else
338	{	655	{
339	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
340	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	657	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
341	}	658	}
342		659
343	delete pkt;	660	delete pkt;
344	}	661	}
345	else if (revents & POLLHUP)
346	{
347	// this cannot ;) happen on udp sockets
348	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
349	exit (1);
350	}
351	else	662	else
352	{	663	{
353	slog (L_ERR,	664	slog (L_ERR,
354	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
355	revents);	666	revents);
356	exit (1);	667	exit (EXIT_FAILURE);
357	}	668	}
358	}	669	}
359		670
360	void	671	inline void
361	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
362	{	673	{
363	if (revents & POLLIN)	674	if (revents & EV_READ)
364	{	675	{
365	/* process data */	676	/* process data */
366	tap_packet *pkt;	677	tap_packet *pkt;
367		678
368	pkt = tap->recv ();	679	pkt = tap->recv ();
369		680
		681	if (!pkt)
		682	return;
		683
		684	if (pkt->len > 14)
		685	{
370	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
371	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
372		688
373	if (src != THISNODE->id)	689	if (src != THISNODE->id)
374	{
375	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
376	exit (1);
377	}
378
379	if (dst == THISNODE->id)
380	{
381	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
382	exit (1);
383	}
384
385	if (dst > conns.size ())
386	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else
388	{
389	if (dst)
390	{	690	{
391	// unicast	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
392	if (dst != THISNODE->id)	692	exit (EXIT_FAILURE);
393	conns[dst - 1]->inject_data_packet (pkt);
394	}	693	}
		694
		695	if (dst == THISNODE->id)
		696	{
		697	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		698	exit (EXIT_FAILURE);
		699	}
		700
		701	if (dst > conns.size ())
		702	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
395	else	703	else
396	{
397	// broadcast, first check router, then self, then english
398	connection *router = find_router ();
399
400	if (router)
401	router->inject_data_packet (pkt, true);	704	inject_data_packet (pkt, dst);
402	else
403	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
404	if ((*c)->conf != THISNODE)
405	(*c)->inject_data_packet (pkt);
406	}
407	}	705	}
408		706
409	delete pkt;	707	delete pkt;
410	}
411	else if (revents & (POLLHUP \| POLLERR))
412	{
413	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
414	exit (1);
415	}	708	}
416	else	709	else
417	abort ();	710	abort ();
418	}	711	}
419		712
420	void	713	inline void
421	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
422	{	715	{
423	if (events)	716	if (events)
424	{	717	{
425	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
426	{	719	{
427	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
428		721
429	shutdown_all ();	722	shutdown_all ();
430
431	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
432
433	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
434		725	exit (EXIT_SUCCESS);
435	exit (0);
436	}	726	}
437		727
438	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
439	{	729	{
440	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
441		731
442	reconnect_all ();	732	reconnect_all ();
443	}	733	}
444		734
445	events = 0;	735	events = 0;
446	}	736	}
447
448	w.at = TSTAMP_CANCEL;
449	}	737	}
450		738
451	void	739	void
452	vpn::shutdown_all ()	740	vpn::shutdown_all ()
453	{	741	{
…		…
463		751
464	conns.clear ();	752	conns.clear ();
465		753
466	connection_init ();	754	connection_init ();
467		755
468	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
469	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
470	{
471	connection *conn = new connection (this);
472		758
473	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
474	conns.push_back (conn);
475
476	conn->establish_connection ();	760	(*c)->establish_connection ();
477	}
478	}	761	}
479		762
480	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
481	{	765	{
482	u32 prio = 0;	766	return src != dst
		767	&& src->may_direct (dst)
		768	&& dst->may_direct (src)
		769	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		770	\|\| (src->protocols & dst->connectable_protocols ()));
		771	}
		772
		773	// only works for indirect and routed connections: find a router
		774	// from THISNODE to dst
		775	connection *
		776	vpn::find_router_for (const connection *dst)
		777	{
483	connection *router = 0;	778	connection *router = 0;
484		779
		780	// first try to find a router with a direct connection, route there
		781	// regardless of any other considerations.
		782	{
		783	u32 prio = 1;
		784
		785	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		786	{
		787	connection c = i;
		788
		789	if (c->conf->routerprio > prio
		790	&& c->conf != THISNODE
		791	&& can_direct (c->conf, dst->conf)
		792	&& c->ictx && c->octx)
		793	{
		794	prio = c->conf->routerprio;
		795	router = c;
		796	}
		797	}
		798	}
		799
		800	if (router)
		801	return router;
		802
		803	// second try find the router with the highest priority, higher than ours
		804	{
		805	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		806
		807	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		808	{
		809	connection c = i;
		810
		811	if (c->conf->routerprio > prio
		812	&& c != dst
		813	&& c->conf != THISNODE
		814	&& c->ictx && c->octx)
		815	{
		816	prio = c->conf->routerprio;
		817	router = c;
		818	}
		819	}
		820	}
		821
		822	return router;
		823	}
		824
		825	void
		826	vpn::connection_established (connection *c)
		827	{
485	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
486	{	829	{
487	connection c = i;	830	connection o = i;
488		831
489	if (c->conf->routerprio > prio	832	if (!o->is_direct
490	&& c->connectmode == conf_node::C_ALWAYS	833	&& o->si.valid ()
491	&& c->conf != THISNODE	834	&& c->si != o->si
492	&& c->ictx && c->octx)	835	&& c == find_router_for (o))
493	{
494	prio = c->conf->routerprio;
495	router = c;
496	}	836	{
		837	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		838	o->conf->nodename, c->conf->nodename);
		839	o->rekey ();
		840	}
497	}	841	}
498
499	return router;
500	}	842	}
501		843
		844	void
502	void vpn::send_connect_request (int id)	845	vpn::send_connect_request (connection *c)
503	{	846	{
504	connection *c = find_router ();	847	connection *r = find_router_for (c);
505		848
506	if (c)	849	if (r)
		850	{
		851	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		852	c->conf->nodename, r->conf->nodename);
507	c->send_connect_request (id);	853	r->send_connect_request (c->conf->id);
		854	}
508	else	855	else
509	// no router found, aggressively connect to all routers	856	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
510	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	857	c->conf->nodename);
511	if ((*i)->conf->routerprio)
512	(*i)->establish_connection ();
513	}	858	}
514		859
515	void	860	void
516	connection::dump_status ()	861	connection::dump_status ()
517	{	862	{
518	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
519	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
520	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
521	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	866	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
522	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
523	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
524	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
525	}	868	}
526		869
527	void	870	void
528	vpn::dump_status ()	871	vpn::dump_status ()
529	{	872	{
530	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
531		874
532	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
533	(*c)->dump_status ();	876	(*c)->dump_status ();
534		877
535	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
536	}	879	}
537		880
538	vpn::vpn (void)	881	vpn::vpn (void)
539	: event(this, &vpn::event_cb)	882	{
		883	event .set<vpn, &vpn::event_cb > (this);
540	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
541	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
542	, tap_ev_watcher (this, &vpn::tap_ev)
543	#if ENABLE_TCP	886	#if ENABLE_TCP
544	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
545	#endif	888	#endif
546	{	889	#if ENABLE_ICMP
		890	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		891	#endif
		892	#if ENABLE_DNS
		893	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		894	#endif
		895	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
547	}	896	}
548		897
549	vpn::~vpn ()	898	vpn::~vpn ()
550	{	899	{
551	}	900	}

Diff Legend

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

Comparing gvpe/src/vpn.C (file contents): Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs. Revision 1.56 by root, Tue Feb 8 23:11:36 2011 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.56 by root, Tue Feb 8 23:11:36 2011 UTC