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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.61 by root, Fri Sep 16 18:08:03 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) 2003-2008,2010,2011 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	udpv4_fd = -1;	153	ipv4_fd = -1;
77		154
78	if (THISNODE->protocols & PROT_UDPv4)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	156	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
81		158
82	if (udpv4_fd < 0)	159	if (ipv4_fd < 0)
83	return -1;	160	return -1;
84		161
85	// standard daemon practise...	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
86	{
87	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}
90
91	sockinfo si (THISNODE, PROT_UDPv4);
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	163	// this I really consider a linux bug. I am neither connected
101	// 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
102	// fragment for me sometimes.	165	// fragment for me sometimes.
103	{	166	{
104	int oval = IP_PMTUDISC_DONT;	167	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	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;
106	}	178	}
107	#endif
108		179
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
110	}	182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
111		185
		186	udpv4_tos = -1;
112	ipv4_fd = -1;	187	udpv4_fd = -1;
113	if (THISNODE->protocols & PROT_IPv4)
114	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
116		188
		189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		190	{
		191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		192
117	if (ipv4_fd < 0)	193	if (udpv4_fd < 0)
118	return -1;	194	return -1;
119		195
120	sockinfo si (THISNODE, PROT_IPv4);	196	// standard daemon practise...
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{	197	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	198	int oval = 1;
125	exit (1);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
126	}	200	}
127		201
128	#ifdef IP_MTU_DISCOVER	202	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	203	// this I really consider a linux bug. I am neither connected
130	// 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
131	// fragment for me sometimes.	205	// fragment for me sometimes.
132	{	206	{
133	int oval = IP_PMTUDISC_DONT;	207	int oval = IP_PMTUDISC_DONT;
		208	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		209	}
		210	#endif
		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
		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);
		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;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	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;
135	}	264	}
136	#endif
137		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)."),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else if (dst > conns.size ())
244	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
245	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
246	else	489	else
247	{	490	{
248	connection *c = conns[src - 1];	491	connection *c = conns[src - 1];
249		492
250	if (dst == 0 && !THISNODE->routerprio)	493	if (dst == 0)
251	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	494	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
252	c->conf->nodename, (const char *)rsi);	495	c->conf->nodename, (const char *)rsi);
253	else if (dst != 0 && dst != THISNODE->id)	496	else if (dst != THISNODE->id)
254	{	497	{
255	if (THISNODE->routerprio)	498	if (THISNODE->routerprio)
256	// the tos setting gets lost here. who cares.	499	// the tos setting gets lost here. who cares.
257	conns[dst - 1]->inject_vpn_packet (pkt);	500	conns[dst - 1]->inject_vpn_packet (pkt);
258	else	501	else
259	slog (L_WARN,	502	slog (L_WARN,
260	_("%s(%s): forwarding request (=> %s), but we are no router"),	503	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
261	c->conf->nodename, (const char *)rsi,	504	c->conf->nodename, (const char *)rsi,
262	conns[dst - 1]->conf->nodename);	505	conns[dst - 1]->conf->nodename);
263	}	506	}
264	else	507	else
265	c->recv_vpn_packet (pkt, rsi);	508	c->recv_vpn_packet (pkt, rsi);
266	}	509	}
267	}	510	}
268		511
269	void	512	bool
270	vpn::udpv4_ev (io_watcher &w, short revents)	513	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
271	{	514	{
272	if (revents & (POLLIN \| POLLERR))	515	switch (si.prot)
		516	{
		517	case PROT_IPv4:
		518	return send_ipv4_packet (pkt, si, tos);
		519
		520	case PROT_UDPv4:
		521	return send_udpv4_packet (pkt, si, tos);
		522
		523	#if ENABLE_TCP
		524	case PROT_TCPv4:
		525	return send_tcpv4_packet (pkt, si, tos);
		526	#endif
		527	#if ENABLE_ICMP
		528	case PROT_ICMPv4:
		529	return send_icmpv4_packet (pkt, si, tos);
		530	#endif
		531	#if ENABLE_DNS
		532	case PROT_DNSv4:
		533	return send_dnsv4_packet (pkt, si, tos);
		534	#endif
		535	default:
		536	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		537	}
		538
		539	return false;
		540	}
		541
		542	inline void
		543	vpn::ipv4_ev (ev::io &w, int revents)
		544	{
		545	if (revents & EV_READ)
273	{	546	{
274	vpn_packet *pkt = new vpn_packet;	547	vpn_packet *pkt = new vpn_packet;
275	struct sockaddr_in sa;	548	struct sockaddr_in sa;
276	socklen_t sa_len = sizeof (sa);	549	socklen_t sa_len = sizeof (sa);
277	int len;	550	int len;
278		551
279	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	552	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
280		553
281	sockinfo si(sa, PROT_UDPv4);	554	sockinfo si(sa, PROT_IPv4);
282		555
283	if (len > 0)	556	if (len > 0)
284	{	557	{
285	pkt->len = len;	558	pkt->len = len;
286		559
		560	// raw sockets deliver the ipv4 header, but don't expect it on sends
		561	pkt->skip_hdr (pkt->ipv4_hdr_len ());
		562
287	recv_vpn_packet (pkt, si);	563	recv_vpn_packet (pkt, si);
288	}	564	}
289	else	565	else
290	{	566	{
291	// probably ECONNRESET or somesuch	567	// probably ECONNRESET or somesuch
292	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	568	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
293	}	569	}
294		570
295	delete pkt;	571	delete pkt;
296	}	572	}
297	else if (revents & POLLHUP)
298	{
299	// this cannot ;) happen on udp sockets
300	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
301	exit (1);
302	}
303	else	573	else
304	{	574	{
305	slog (L_ERR,	575	slog (L_ERR,
306	_("FATAL: unknown revents %08x in socket, terminating\n"),	576	_("FATAL: unknown revents %08x in socket, exiting.\n"),
307	revents);	577	revents);
308	exit (1);	578	exit (EXIT_FAILURE);
309	}	579	}
310	}	580	}
311		581
312	void	582	#if ENABLE_ICMP
		583	inline void
313	vpn::ipv4_ev (io_watcher &w, short revents)	584	vpn::icmpv4_ev (ev::io &w, int revents)
314	{	585	{
315	if (revents & (POLLIN \| POLLERR))	586	if (revents & EV_READ)
316	{	587	{
317	vpn_packet *pkt = new vpn_packet;	588	vpn_packet *pkt = new vpn_packet;
318	struct sockaddr_in sa;	589	struct sockaddr_in sa;
319	socklen_t sa_len = sizeof (sa);	590	socklen_t sa_len = sizeof (sa);
320	int len;	591	int len;
321		592
322	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	593	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
323		594
324	sockinfo si(sa, PROT_IPv4);	595	sockinfo si(sa, PROT_ICMPv4);
325		596
326	if (len > 0)	597	if (len > 0)
327	{	598	{
328	pkt->len = len;	599	pkt->len = len;
329		600
		601	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		602
		603	if (hdr->type == ::conf.icmp_type
		604	&& hdr->code == 255)
		605	{
330	// raw sockets deliver the ipv4, but don't expect it on sends	606	// raw sockets deliver the ipv4, but don't expect it on sends
331	// this is slow, but...	607	// this is slow, but...
332	pkt->skip_hdr (IP_OVERHEAD);	608	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
		609
		610	recv_vpn_packet (pkt, si);
		611	}
		612	}
		613	else
		614	{
		615	// probably ECONNRESET or somesuch
		616	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		617	}
		618
		619	delete pkt;
		620	}
		621	else
		622	{
		623	slog (L_ERR,
		624	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		625	revents);
		626	exit (EXIT_FAILURE);
		627	}
		628	}
		629	#endif
		630
		631	inline void
		632	vpn::udpv4_ev (ev::io &w, int revents)
		633	{
		634	if (revents & EV_READ)
		635	{
		636	vpn_packet *pkt = new vpn_packet;
		637	struct sockaddr_in sa;
		638	socklen_t sa_len = sizeof (sa);
		639	int len;
		640
		641	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		642
		643	sockinfo si(sa, PROT_UDPv4);
		644
		645	if (len > 0)
		646	{
		647	pkt->len = len;
333		648
334	recv_vpn_packet (pkt, si);	649	recv_vpn_packet (pkt, si);
335	}	650	}
336	else	651	else
337	{	652	{
338	// probably ECONNRESET or somesuch	653	// probably ECONNRESET or somesuch
339	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	654	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
340	}	655	}
341		656
342	delete pkt;	657	delete pkt;
343	}	658	}
344	else if (revents & POLLHUP)
345	{
346	// this cannot ;) happen on udp sockets
347	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
348	exit (1);
349	}
350	else	659	else
351	{	660	{
352	slog (L_ERR,	661	slog (L_ERR,
353	_("FATAL: unknown revents %08x in socket, terminating\n"),	662	_("FATAL: unknown revents %08x in socket, exiting.\n"),
354	revents);	663	revents);
355	exit (1);	664	exit (EXIT_FAILURE);
356	}	665	}
357	}	666	}
358		667
359	void	668	inline void
360	vpn::tap_ev (io_watcher &w, short revents)	669	vpn::tap_ev (ev::io &w, int revents)
361	{	670	{
362	if (revents & POLLIN)	671	if (revents & EV_READ)
363	{	672	{
364	/* process data */	673	/* process data */
365	tap_packet *pkt;	674	tap_packet *pkt;
366		675
367	pkt = tap->recv ();	676	pkt = tap->recv ();
368		677
		678	if (!pkt)
		679	return;
		680
		681	if (pkt->len > 14)
		682	{
369	int dst = mac2id (pkt->dst);	683	int dst = mac2id (pkt->dst);
370	int src = mac2id (pkt->src);	684	int src = mac2id (pkt->src);
371		685
372	if (src != THISNODE->id)	686	if (src != THISNODE->id)
373	{
374	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
375	exit (1);
376	}
377
378	if (dst == THISNODE->id)
379	{
380	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
381	exit (1);
382	}
383
384	if (dst > conns.size ())
385	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
386	else
387	{
388	if (dst)
389	{	687	{
390	// unicast	688	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
391	if (dst != THISNODE->id)	689	exit (EXIT_FAILURE);
392	conns[dst - 1]->inject_data_packet (pkt);
393	}	690	}
		691
		692	if (dst == THISNODE->id)
		693	{
		694	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		695	exit (EXIT_FAILURE);
		696	}
		697
		698	if (dst > conns.size ())
		699	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
394	else	700	else
395	{
396	// broadcast, first check router, then self, then english
397	connection *router = find_router ();
398
399	if (router)
400	router->inject_data_packet (pkt, true);	701	inject_data_packet (pkt, dst);
401	else
402	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
403	if ((*c)->conf != THISNODE)
404	(*c)->inject_data_packet (pkt);
405	}
406	}	702	}
407		703
408	delete pkt;	704	delete pkt;
409	}	705	}
410	else if (revents & (POLLHUP \| POLLERR))
411	{
412	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
413	exit (1);
414	}
415	else	706	else
416	abort ();	707	abort ();
417	}	708	}
418		709
419	void	710	inline void
420	vpn::event_cb (time_watcher &w)	711	vpn::event_cb (ev::timer &w, int)
421	{	712	{
422	if (events)	713	if (events)
423	{	714	{
424	if (events & EVENT_SHUTDOWN)	715	if (events & EVENT_SHUTDOWN)
425	{	716	{
426	slog (L_INFO, _("preparing shutdown..."));	717	slog (L_INFO, _("preparing shutdown..."));
427		718
428	shutdown_all ();	719	shutdown_all ();
429
430	remove_pid (pidfilename);	720	remove_pid (conf.pidfilename);
431
432	slog (L_INFO, _("terminating"));	721	slog (L_INFO, _("exiting."));
433		722	exit (EXIT_SUCCESS);
434	exit (0);
435	}	723	}
436		724
437	if (events & EVENT_RECONNECT)	725	if (events & EVENT_RECONNECT)
438	{	726	{
439	slog (L_INFO, _("forced reconnect"));	727	slog (L_INFO, _("forced reconnect."));
440		728
441	reconnect_all ();	729	reconnect_all ();
442	}	730	}
443		731
444	events = 0;	732	events = 0;
445	}	733	}
446
447	w.at = TSTAMP_CANCEL;
448	}	734	}
449		735
450	void	736	void
451	vpn::shutdown_all ()	737	vpn::shutdown_all ()
452	{	738	{
…		…
462		748
463	conns.clear ();	749	conns.clear ();
464		750
465	connection_init ();	751	connection_init ();
466		752
467	for (configuration::node_vector::iterator i = conf.nodes.begin ();	753	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
468	i != conf.nodes.end (); ++i)	754	conns.push_back (new connection (this, *i));
469	{
470	connection *conn = new connection (this);
471		755
472	conn->conf = *i;	756	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
473	conns.push_back (conn);
474
475	conn->establish_connection ();	757	(*c)->establish_connection ();
476	}
477	}	758	}
478		759
479	connection *vpn::find_router ()	760	bool
		761	vpn::can_direct (conf_node src, conf_node dst) const
480	{	762	{
481	u32 prio = 0;	763	return src != dst
		764	&& src->may_direct (dst)
		765	&& dst->may_direct (src)
		766	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		767	\|\| (src->protocols & dst->connectable_protocols ()));
		768	}
		769
		770	// only works for indirect and routed connections: find a router
		771	// from THISNODE to dst
		772	connection *
		773	vpn::find_router_for (const connection *dst)
		774	{
482	connection *router = 0;	775	connection *router = 0;
483		776
		777	// first try to find a router with a direct connection, route there
		778	// regardless of any other considerations.
		779	{
		780	u32 prio = 1;
		781
		782	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		783	{
		784	connection c = i;
		785
		786	if (c->conf->routerprio > prio
		787	&& c->conf != THISNODE
		788	&& can_direct (c->conf, dst->conf)
		789	&& c->ictx && c->octx)
		790	{
		791	prio = c->conf->routerprio;
		792	router = c;
		793	}
		794	}
		795	}
		796
		797	if (router)
		798	return router;
		799
		800	// second try find the router with the highest priority, higher than ours
		801	{
		802	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		803
		804	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		805	{
		806	connection c = i;
		807
		808	if (c->conf->routerprio > prio
		809	&& c != dst
		810	&& c->conf != THISNODE
		811	&& c->ictx && c->octx)
		812	{
		813	prio = c->conf->routerprio;
		814	router = c;
		815	}
		816	}
		817	}
		818
		819	return router;
		820	}
		821
		822	void
		823	vpn::connection_established (connection *c)
		824	{
484	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
485	{	826	{
486	connection c = i;	827	connection o = i;
487		828
488	if (c->conf->routerprio > prio	829	if (!o->is_direct
489	&& c->connectmode == conf_node::C_ALWAYS	830	&& o->si.valid ()
490	&& c->conf != THISNODE	831	&& c->si != o->si
491	&& c->ictx && c->octx)	832	&& c == find_router_for (o))
492	{
493	prio = c->conf->routerprio;
494	router = c;
495	}	833	{
		834	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		835	o->conf->nodename, c->conf->nodename);
		836	o->rekey ();
		837	}
496	}	838	}
497
498	return router;
499	}	839	}
500		840
501	void vpn::connect_request (int id)	841	void
		842	vpn::send_connect_request (connection *c)
502	{	843	{
503	connection *c = find_router ();	844	connection *r = find_router_for (c);
504		845
505	if (c)	846	if (r)
		847	{
		848	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		849	c->conf->nodename, r->conf->nodename);
506	c->connect_request (id);	850	r->send_connect_request (c->conf->id);
507	//else // does not work, because all others must connect to the same router	851	}
508	// // no router found, aggressively connect to all routers	852	else
509	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	853	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
510	// if ((*i)->conf->routerprio)	854	c->conf->nodename);
511	// (*i)->establish_connection ();
512	}	855	}
513		856
514	void	857	void
515	connection::dump_status ()	858	connection::dump_status ()
516	{	859	{
517	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	860	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
518	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	861	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
519	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	862	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
520	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	863	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
521	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	864	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
522	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
523	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
524	}	865	}
525		866
526	void	867	void
527	vpn::dump_status ()	868	vpn::dump_status ()
528	{	869	{
529	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	870	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
530		871
531	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	872	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
532	(*c)->dump_status ();	873	(*c)->dump_status ();
533		874
534	slog (L_NOTICE, _("END status dump"));	875	slog (L_NOTICE, _("END status dump"));
535	}	876	}
536		877
537	vpn::vpn (void)	878	vpn::vpn (void)
538	: event(this, &vpn::event_cb)	879	{
		880	event .set<vpn, &vpn::event_cb > (this);
539	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	881	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
540	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	882	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
541	, tap_ev_watcher (this, &vpn::tap_ev)
542	#if ENABLE_TCP	883	#if ENABLE_TCP
543	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	884	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
544	#endif	885	#endif
545	{	886	#if ENABLE_ICMP
		887	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		888	#endif
		889	#if ENABLE_DNS
		890	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		891	#endif
		892	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
546	}	893	}
547		894
548	vpn::~vpn ()	895	vpn::~vpn ()
549	{	896	{
550	}	897	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.61 by root, Fri Sep 16 18:08:03 2011 UTC