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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.56 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;
76	ipv4_fd = -1;	153	ipv4_fd = -1;
77		154
78	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	156	{
80	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
81		158
82	if (ipv4_fd < 0)	159	if (ipv4_fd < 0)
83	return -1;	160	return -1;
84		161
85	sockinfo si (THISNODE, PROT_IPv4);	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
86
87	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
88	{
89	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
90	exit (1);
91	}
92
93	#ifdef IP_MTU_DISCOVER
94	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
95	// nor do I fragment myself. Linux still sets DF and doesn't	164	// nor do I fragment myself. Linux still sets DF and doesn't
96	// fragment for me sometimes.	165	// fragment for me sometimes.
97	{	166	{
98	int oval = IP_PMTUDISC_DONT;	167	int oval = IP_PMTUDISC_DONT;
99	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	168	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100	}	169	}
101	#endif	170	#endif
102		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
103	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
104	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
105		185
		186	udpv4_tos = -1;
106	udpv4_fd = -1;	187	udpv4_fd = -1;
107		188
108	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
109	{	190	{
110	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111		192
112	if (udpv4_fd < 0)	193	if (udpv4_fd < 0)
113	return -1;	194	return -1;
114		195
115	// standard daemon practise...	196	// standard daemon practise...
116	{	197	{
117	int oval = 1;	198	int oval = 1;
118	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119	}	200	}
120		201
121	sockinfo si (THISNODE, PROT_UDPv4);	202	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
122
123	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
124	{
125	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
126	exit (1);
127	}
128
129	#ifdef IP_MTU_DISCOVER
130	// this I really consider a linux bug. I am neither connected	203	// this I really consider a linux bug. I am neither connected
131	// 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
132	// fragment for me sometimes.	205	// fragment for me sometimes.
133	{	206	{
134	int oval = IP_PMTUDISC_DONT;	207	int oval = IP_PMTUDISC_DONT;
135	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	208	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136	}	209	}
137	#endif	210	#endif
138		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
139	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
		222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
		225
		226	icmpv4_tos = -1;
		227	icmpv4_fd = -1;
		228
		229	#if ENABLE_ICMP
		230	if (THISNODE->protocols & PROT_ICMPv4)
		231	{
		232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
		233
		234	if (icmpv4_fd < 0)
		235	return -1;
		236
		237	#ifdef ICMP_FILTER
		238	{
		239	icmp_filter oval;
		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);
140	}	245	}
		246	#endif
		247
		248	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		249	// this I really consider a linux bug. I am neither connected
		250	// nor do I fragment myself. Linux still sets DF and doesn't
		251	// fragment for me sometimes.
		252	{
		253	int oval = IP_PMTUDISC_DONT;
		254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		255	}
		256	#endif
		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
		266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
		268	}
		269	#endif
141		270
142	tcpv4_fd = -1;	271	tcpv4_fd = -1;
143		272
144	#if ENABLE_TCP	273	#if ENABLE_TCP
145	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
146	{	275	{
147	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
148		277
149	if (tcpv4_fd < 0)	278	if (tcpv4_fd < 0)
150	return -1;	279	return -1;
151		280
152	// standard daemon practise...	281	// standard daemon practise...
157		286
158	sockinfo si (THISNODE, PROT_TCPv4);	287	sockinfo si (THISNODE, PROT_TCPv4);
159		288
160	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161	{	290	{
162	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));
163	exit (1);	292	return -1;
164	}	293	}
165		294
166	if (listen (tcpv4_fd, 5))	295	if (listen (tcpv4_fd, 5))
167	{	296	{
168	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));
169	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);
170	}	328	}
171
172	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
173	}
174	#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	/////////////////////////////////////////////////////////////////////////////
175		363
176	tap = new tap_device ();	364	tap = new tap_device ();
177	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
178	{	366	{
179	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
180	exit (1);	368	return -1;
181	}	369	}
182		370
183	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
184		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
185	tap_ev_watcher.start (tap->fd, POLLIN);	391	tap_ev_watcher.start (tap->fd, EV_READ);
186
187	reconnect_all ();
188		392
189	return 0;	393	return 0;
190	}
191
192	// send a vpn packet out to other hosts
193	bool
194	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
195	{
196	switch (si.prot)
197	{
198	case PROT_IPv4:
199	return send_ipv4_packet (pkt, si, tos);
200
201	case PROT_UDPv4:
202	return send_udpv4_packet (pkt, si, tos);
203
204	#if ENABLE_TCP
205	case PROT_TCPv4:
206	return send_tcpv4_packet (pkt, si, tos);
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	return false;
212	}
213	}	394	}
214		395
215	bool	396	bool
216	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)
217	{	398	{
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	399	set_tos (ipv4_fd, ipv4_tos, tos);
219	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 ());
220		401
221	return true;	402	return true;
222	}	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
223		446
224	bool	447	bool
225	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)
226	{	449	{
227	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	450	set_tos (udpv4_fd, udpv4_tos, tos);
228	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 ());
229		452
230	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	}
231	}	473	}
232		474
233	void	475	void
234	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
235	{	477	{
236	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
237	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
238		480
239	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."),
240	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
241		483
242	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
243	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
244	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
245	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)."),
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else if (dst > conns.size ())	489	else if (dst > conns.size ())
248	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)."),
249	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
250	else	492	else
251	{	493	{
252	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
253		495
254	if (dst == 0 && !THISNODE->routerprio)	496	if (dst == 0)
255	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
256	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
257	else if (dst != 0 && dst != THISNODE->id)	499	else if (dst != THISNODE->id)
258	{	500	{
259	if (THISNODE->routerprio)	501	if (THISNODE->routerprio)
260	// the tos setting gets lost here. who cares.	502	// the tos setting gets lost here. who cares.
261	conns[dst - 1]->inject_vpn_packet (pkt);	503	conns[dst - 1]->inject_vpn_packet (pkt);
262	else	504	else
263	slog (L_WARN,	505	slog (L_WARN,
264	_("%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?)."),
265	c->conf->nodename, (const char *)rsi,	507	c->conf->nodename, (const char *)rsi,
266	conns[dst - 1]->conf->nodename);	508	conns[dst - 1]->conf->nodename);
267	}	509	}
268	else	510	else
269	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
270	}	512	}
271	}	513	}
272		514
273	void	515	bool
274	vpn::udpv4_ev (io_watcher &w, short revents)	516	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	517	{
276	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)
277	{	549	{
278	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
279	struct sockaddr_in sa;	551	struct sockaddr_in sa;
280	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
281	int len;	553	int len;
282		554
283	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);
284		556
285	sockinfo si(sa, PROT_UDPv4);	557	sockinfo si(sa, PROT_IPv4);
286		558
287	if (len > 0)	559	if (len > 0)
288	{	560	{
289	pkt->len = len;	561	pkt->len = len;
290		562
		563	// raw sockets deliver the ipv4 header, but don't expect it on sends
		564	pkt->skip_hdr (IP_OVERHEAD);
		565
291	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
292	}	567	}
293	else	568	else
294	{	569	{
295	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
296	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));
297	}	572	}
298		573
299	delete pkt;	574	delete pkt;
300	}	575	}
301	else if (revents & POLLHUP)
302	{
303	// this cannot ;) happen on udp sockets
304	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
305	exit (1);
306	}
307	else	576	else
308	{	577	{
309	slog (L_ERR,	578	slog (L_ERR,
310	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
311	revents);	580	revents);
312	exit (1);	581	exit (EXIT_FAILURE);
313	}	582	}
314	}	583	}
315		584
316	void	585	#if ENABLE_ICMP
		586	inline void
317	vpn::ipv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
318	{	588	{
319	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
320	{	590	{
321	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
322	struct sockaddr_in sa;	592	struct sockaddr_in sa;
323	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
324	int len;	594	int len;
325		595
326	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);
327		597
328	sockinfo si(sa, PROT_IPv4);	598	sockinfo si(sa, PROT_ICMPv4);
329		599
330	if (len > 0)	600	if (len > 0)
331	{	601	{
332	pkt->len = len;	602	pkt->len = len;
333		603
		604	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		605
		606	if (hdr->type == ::conf.icmp_type
		607	&& hdr->code == 255)
		608	{
334	// 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
335	// this is slow, but...	610	// this is slow, but...
336	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;
337		651
338	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
339	}	653	}
340	else	654	else
341	{	655	{
342	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
343	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));
344	}	658	}
345		659
346	delete pkt;	660	delete pkt;
347	}	661	}
348	else if (revents & POLLHUP)
349	{
350	// this cannot ;) happen on udp sockets
351	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
352	exit (1);
353	}
354	else	662	else
355	{	663	{
356	slog (L_ERR,	664	slog (L_ERR,
357	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
358	revents);	666	revents);
359	exit (1);	667	exit (EXIT_FAILURE);
360	}	668	}
361	}	669	}
362		670
363	void	671	inline void
364	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
365	{	673	{
366	if (revents & POLLIN)	674	if (revents & EV_READ)
367	{	675	{
368	/* process data */	676	/* process data */
369	tap_packet *pkt;	677	tap_packet *pkt;
370		678
371	pkt = tap->recv ();	679	pkt = tap->recv ();
372		680
		681	if (!pkt)
		682	return;
		683
		684	if (pkt->len > 14)
		685	{
373	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
374	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
375		688
376	if (src != THISNODE->id)	689	if (src != THISNODE->id)
377	{
378	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
379	exit (1);
380	}
381
382	if (dst == THISNODE->id)
383	{
384	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
385	exit (1);
386	}
387
388	if (dst > conns.size ())
389	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
390	else
391	{
392	if (dst)
393	{	690	{
394	// unicast	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
395	if (dst != THISNODE->id)	692	exit (EXIT_FAILURE);
396	conns[dst - 1]->inject_data_packet (pkt);
397	}	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);
398	else	703	else
399	{
400	// broadcast, first check router, then self, then english
401	connection *router = find_router ();
402
403	if (router)
404	router->inject_data_packet (pkt, true);	704	inject_data_packet (pkt, dst);
405	else
406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
407	if ((*c)->conf != THISNODE)
408	(*c)->inject_data_packet (pkt);
409	}
410	}	705	}
411		706
412	delete pkt;	707	delete pkt;
413	}
414	else if (revents & (POLLHUP \| POLLERR))
415	{
416	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
417	exit (1);
418	}	708	}
419	else	709	else
420	abort ();	710	abort ();
421	}	711	}
422		712
423	void	713	inline void
424	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
425	{	715	{
426	if (events)	716	if (events)
427	{	717	{
428	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
429	{	719	{
430	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
431		721
432	shutdown_all ();	722	shutdown_all ();
433
434	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
435
436	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
437		725	exit (EXIT_SUCCESS);
438	exit (0);
439	}	726	}
440		727
441	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
442	{	729	{
443	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
444		731
445	reconnect_all ();	732	reconnect_all ();
446	}	733	}
447		734
448	events = 0;	735	events = 0;
449	}	736	}
450
451	w.at = TSTAMP_CANCEL;
452	}	737	}
453		738
454	void	739	void
455	vpn::shutdown_all ()	740	vpn::shutdown_all ()
456	{	741	{
…		…
466		751
467	conns.clear ();	752	conns.clear ();
468		753
469	connection_init ();	754	connection_init ();
470		755
471	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
472	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
473	{
474	connection *conn = new connection (this);
475		758
476	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
477	conns.push_back (conn);
478
479	conn->establish_connection ();	760	(*c)->establish_connection ();
480	}
481	}	761	}
482		762
483	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
484	{	765	{
485	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	{
486	connection *router = 0;	778	connection *router = 0;
487		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	{
488	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489	{	829	{
490	connection c = i;	830	connection o = i;
491		831
492	if (c->conf->routerprio > prio	832	if (!o->is_direct
493	&& c->connectmode == conf_node::C_ALWAYS	833	&& o->si.valid ()
494	&& c->conf != THISNODE	834	&& c->si != o->si
495	&& c->ictx && c->octx)	835	&& c == find_router_for (o))
496	{
497	prio = c->conf->routerprio;
498	router = c;
499	}	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	}
500	}	841	}
501
502	return router;
503	}	842	}
504		843
		844	void
505	void vpn::send_connect_request (int id)	845	vpn::send_connect_request (connection *c)
506	{	846	{
507	connection *c = find_router ();	847	connection *r = find_router_for (c);
508		848
509	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);
510	c->send_connect_request (id);	853	r->send_connect_request (c->conf->id);
		854	}
511	else	855	else
512	// 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."),
513	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	857	c->conf->nodename);
514	if ((*i)->conf->routerprio)
515	(*i)->establish_connection ();
516	}	858	}
517		859
518	void	860	void
519	connection::dump_status ()	861	connection::dump_status ()
520	{	862	{
521	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
522	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
523	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
524	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"),
525	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
526	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
527	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
528	}	868	}
529		869
530	void	870	void
531	vpn::dump_status ()	871	vpn::dump_status ()
532	{	872	{
533	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
534		874
535	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
536	(*c)->dump_status ();	876	(*c)->dump_status ();
537		877
538	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
539	}	879	}
540		880
541	vpn::vpn (void)	881	vpn::vpn (void)
542	: event(this, &vpn::event_cb)	882	{
		883	event .set<vpn, &vpn::event_cb > (this);
543	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
544	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
545	, tap_ev_watcher (this, &vpn::tap_ev)
546	#if ENABLE_TCP	886	#if ENABLE_TCP
547	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
548	#endif	888	#endif
549	{	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);
550	}	896	}
551		897
552	vpn::~vpn ()	898	vpn::~vpn ()
553	{	899	{
554	}	900	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs. Revision 1.56 by root, Tue Feb 8 23:11:36 2011 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.56 by root, Tue Feb 8 23:11:36 2011 UTC