[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 1.57 by root, Tue Feb 8 23:13:48 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	}	394	}
188		395
189	// send a vpn packet out to other hosts	396	bool
		397	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		398	{
		399	set_tos (ipv4_fd, ipv4_tos, tos);
		400	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		401
		402	return true;
		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
		446
		447	bool
		448	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		449	{
		450	set_tos (udpv4_fd, udpv4_tos, tos);
		451	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		452
		453	return true;
		454	}
		455
190	void	456	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	457	vpn::inject_data_packet (tap_packet *pkt, int dst)
192	{	458	{
193	switch (si.prot)	459	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	}	460	{
213	}	461	// unicast
214		462	if (dst != THISNODE->id)
215	void	463	conns[dst - 1]->inject_data_packet (pkt);
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	464	}
217	{	465	else
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	466	{
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	467	// broadcast, this is ugly, but due to the security policy
220	}	468	// we have to connect to all hosts...
221		469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
222	void	470	if ((*c)->conf != THISNODE)
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	471	(*c)->inject_data_packet (pkt);
224	{	472	}
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	}	473	}
228		474
229	void	475	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	477	{
232	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
233	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
234		480
235	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."),
236	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
237		483
238	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	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)."),
		488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		489	else if (dst > conns.size ())
		490	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	492	else
244	{	493	{
245	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
246		495
247	if (dst == 0 && !THISNODE->routerprio)	496	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
249	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	499	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	500	{
		501	if (THISNODE->routerprio)
		502	// the tos setting gets lost here. who cares.
		503	conns[dst - 1]->inject_vpn_packet (pkt);
		504	else
252	slog (L_WARN,	505	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	506	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		507	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	508	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	509	}
256	THISNODE->id, THISNODE->nodename);
257	else	510	else
258	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
259	}	512	}
260	}	513	}
261		514
262	void	515	bool
263	vpn::udpv4_ev (io_watcher &w, short revents)	516	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
264	{	517	{
265	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)
266	{	549	{
267	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	551	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
270	int len;	553	int len;
271		554
272	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);
273		556
274	sockinfo si(sa, PROT_UDPv4);	557	sockinfo si(sa, PROT_IPv4);
275		558
276	if (len > 0)	559	if (len > 0)
277	{	560	{
278	pkt->len = len;	561	pkt->len = len;
279		562
		563	// raw sockets deliver the ipv4 header, but don't expect it on sends
		564	pkt->skip_hdr (IP_OVERHEAD);
		565
280	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
281	}	567	}
282	else	568	else
283	{	569	{
284	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
285	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));
286	}	572	}
287		573
288	delete pkt;	574	delete pkt;
289	}	575	}
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	576	else
297	{	577	{
298	slog (L_ERR,	578	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
300	revents);	580	revents);
301	exit (1);	581	exit (EXIT_FAILURE);
302	}	582	}
303	}	583	}
304		584
305	void	585	#if ENABLE_ICMP
		586	inline void
306	vpn::ipv4_ev (io_watcher &w, short revents)	587	vpn::icmpv4_ev (ev::io &w, int revents)
307	{	588	{
308	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
309	{	590	{
310	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	592	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
313	int len;	594	int len;
314		595
315	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);
316		597
317	sockinfo si(sa, PROT_IPv4);	598	sockinfo si(sa, PROT_ICMPv4);
318		599
319	if (len > 0)	600	if (len > 0)
320	{	601	{
321	pkt->len = len;	602	pkt->len = len;
322		603
		604	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		605
		606	if (hdr->type == ::conf.icmp_type
		607	&& hdr->code == 255)
		608	{
323	// 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
324	// this is slow, but...	610	// this is slow, but...
325	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;
326		651
327	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
328	}	653	}
329	else	654	else
330	{	655	{
331	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
332	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));
333	}	658	}
334		659
335	delete pkt;	660	delete pkt;
336	}	661	}
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	662	else
344	{	663	{
345	slog (L_ERR,	664	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
347	revents);	666	revents);
348	exit (1);	667	exit (EXIT_FAILURE);
349	}	668	}
350	}	669	}
351		670
352	void	671	inline void
353	vpn::tap_ev (io_watcher &w, short revents)	672	vpn::tap_ev (ev::io &w, int revents)
354	{	673	{
355	if (revents & POLLIN)	674	if (revents & EV_READ)
356	{	675	{
357	/* process data */	676	/* process data */
358	tap_packet *pkt;	677	tap_packet *pkt;
359		678
360	pkt = tap->recv ();	679	pkt = tap->recv ();
361		680
		681	if (!pkt)
		682	return;
		683
		684	if (pkt->len > 14)
		685	{
362	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
364		688
365	if (src != THISNODE->id)	689	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	{	690	{
383	// unicast	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
384	if (dst != THISNODE->id)	692	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	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);
387	else	703	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);	704	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	}	705	}
400		706
401	delete pkt;	707	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	}	708	}
408	else	709	else
409	abort ();	710	abort ();
410	}	711	}
411		712
412	void	713	inline void
413	vpn::event_cb (time_watcher &w)	714	vpn::event_cb (ev::timer &w, int)
414	{	715	{
415	if (events)	716	if (events)
416	{	717	{
417	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
418	{	719	{
419	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
420		721
421	shutdown_all ();	722	shutdown_all ();
422
423	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
426		725	exit (EXIT_SUCCESS);
427	exit (0);
428	}	726	}
429		727
430	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
431	{	729	{
432	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
433		731
434	reconnect_all ();	732	reconnect_all ();
435	}	733	}
436		734
437	events = 0;	735	events = 0;
438	}	736	}
439
440	w.at = TSTAMP_CANCEL;
441	}	737	}
442		738
443	void	739	void
444	vpn::shutdown_all ()	740	vpn::shutdown_all ()
445	{	741	{
…		…
455		751
456	conns.clear ();	752	conns.clear ();
457		753
458	connection_init ();	754	connection_init ();
459		755
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
461	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
462	{
463	connection *conn = new connection (this);
464		758
465	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
466	conns.push_back (conn);
467
468	conn->establish_connection ();	760	(*c)->establish_connection ();
469	}
470	}	761	}
471		762
472	connection *vpn::find_router ()	763	bool
		764	vpn::can_direct (conf_node src, conf_node dst) const
473	{	765	{
474	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	{
475	connection *router = 0;	778	connection *router = 0;
476		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	{
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	828	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	829	{
479	connection c = i;	830	connection o = i;
480		831
481	if (c->conf->routerprio > prio	832	if (!o->is_direct
482	&& c->connectmode == conf_node::C_ALWAYS	833	&& o->si.valid ()
483	&& c->conf != THISNODE	834	&& c->si != o->si
484	&& c->ictx && c->octx)	835	&& c == find_router_for (o))
485	{
486	prio = c->conf->routerprio;
487	router = c;
488	}	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	}
489	}	841	}
490
491	return router;
492	}	842	}
493		843
494	void vpn::connect_request (int id)	844	void
		845	vpn::send_connect_request (connection *c)
495	{	846	{
496	connection *c = find_router ();	847	connection *r = find_router_for (c);
497		848
498	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);
499	c->connect_request (id);	853	r->send_connect_request (c->conf->id);
500	//else // does not work, because all others must connect to the same router	854	}
501	// // no router found, aggressively connect to all routers	855	else
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	856	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
503	// if ((*i)->conf->routerprio)	857	c->conf->nodename);
504	// (*i)->establish_connection ();
505	}	858	}
506		859
507	void	860	void
508	connection::dump_status ()	861	connection::dump_status ()
509	{	862	{
510	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	863	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
511	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	864	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
512	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	865	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
513	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"),
514	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	867	(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	}	868	}
518		869
519	void	870	void
520	vpn::dump_status ()	871	vpn::dump_status ()
521	{	872	{
522	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	873	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
523		874
524	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	875	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
525	(*c)->dump_status ();	876	(*c)->dump_status ();
526		877
527	slog (L_NOTICE, _("END status dump"));	878	slog (L_NOTICE, _("END status dump"));
528	}	879	}
529		880
530	vpn::vpn (void)	881	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	882	{
		883	event .set<vpn, &vpn::event_cb > (this);
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	884	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	885	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	886	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	887	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
537	#endif	888	#endif
538	{	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);
539	}	896	}
540		897
541	vpn::~vpn ()	898	vpn::~vpn ()
542	{	899	{
543	}	900	}

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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 1.57 by root, Tue Feb 8 23:13:48 2011 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 1.57 by root, Tue Feb 8 23:13:48 2011 UTC