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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 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	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
71	}	144	}
72		145
73	int	146	int
74	vpn::setup ()	147	vpn::setup ()
75	{	148	{
		149	int success = 0;
		150
		151	ipv4_tos = -1;
76	udpv4_fd = -1;	152	ipv4_fd = -1;
77		153
78	if (THISNODE->protocols & PROT_UDPv4)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	155	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
81		157
82	if (udpv4_fd < 0)	158	if (ipv4_fd < 0)
83	return -1;	159	return -1;
84		160
85	// standard daemon practise...	161	#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	162	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	163	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	164	// fragment for me sometimes.
103	{	165	{
104	int oval = IP_PMTUDISC_DONT;	166	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	167	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		168	}
		169	#endif
		170
		171	sockinfo si (THISNODE, PROT_IPv4);
		172
		173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		174	{
		175	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		176	return -1;
106	}	177	}
107	#endif
108		178
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
110	}	181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
111		184
		185	udpv4_tos = -1;
112	ipv4_fd = -1;	186	udpv4_fd = -1;
113	if (THISNODE->protocols & PROT_IPv4)
114	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
116		187
		188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		189	{
		190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		191
117	if (ipv4_fd < 0)	192	if (udpv4_fd < 0)
118	return -1;	193	return -1;
119		194
120	sockinfo si (THISNODE, PROT_IPv4);	195	// standard daemon practise...
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{	196	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	197	int oval = 1;
125	exit (1);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
126	}	199	}
127		200
128	#ifdef IP_MTU_DISCOVER	201	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	202	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	203	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	204	// fragment for me sometimes.
132	{	205	{
133	int oval = IP_PMTUDISC_DONT;	206	int oval = IP_PMTUDISC_DONT;
		207	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		208	}
		209	#endif
		210
		211	sockinfo si (THISNODE, PROT_UDPv4);
		212
		213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		214	{
		215	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		216	return -1;
		217	}
		218
		219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
		221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
		224
		225	icmpv4_tos = -1;
		226	icmpv4_fd = -1;
		227
		228	#if ENABLE_ICMP
		229	if (THISNODE->protocols & PROT_ICMPv4)
		230	{
		231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
		232
		233	if (icmpv4_fd < 0)
		234	return -1;
		235
		236	#ifdef ICMP_FILTER
		237	{
		238	icmp_filter oval;
		239	oval.data = 0xffffffff;
		240	if (::conf.icmp_type < 32)
		241	oval.data &= ~(1 << ::conf.icmp_type);
		242
		243	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
		244	}
		245	#endif
		246
		247	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		248	// this I really consider a linux bug. I am neither connected
		249	// nor do I fragment myself. Linux still sets DF and doesn't
		250	// fragment for me sometimes.
		251	{
		252	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		254	}
		255	#endif
		256
		257	sockinfo si (THISNODE, PROT_ICMPv4);
		258
		259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		260	{
		261	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		262	return -1;
135	}	263	}
136	#endif
137		264
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
139	}	267	}
		268	#endif
		269
		270	tcpv4_fd = -1;
140		271
141	#if ENABLE_TCP	272	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	274	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		276
146	if (tcpv4_fd < 0)	277	if (tcpv4_fd < 0)
147	return -1;	278	return -1;
148		279
149	// standard daemon practise...	280	// standard daemon practise...
154		285
155	sockinfo si (THISNODE, PROT_TCPv4);	286	sockinfo si (THISNODE, PROT_TCPv4);
156		287
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	289	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	290	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
160	exit (1);	291	return -1;
161	}	292	}
162		293
163	if (listen (tcpv4_fd, 5))	294	if (listen (tcpv4_fd, 5))
164	{	295	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	296	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
166	exit (1);	297	return -1;
		298	}
		299
		300	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		301	++success;
		302	}
		303	else
		304	THISNODE->protocols &= ~PROT_TCPv4;
		305	#endif
		306
		307	dnsv4_tos = -1;
		308	dnsv4_fd = -1;
		309
		310	#if ENABLE_DNS
		311	if (THISNODE->protocols & PROT_DNSv4)
		312	{
		313	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		314
		315	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		316
		317	if (dnsv4_fd < 0)
		318	return -1;
		319
		320	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		321	// this I really consider a linux bug. I am neither connected
		322	// nor do I fragment myself. Linux still sets DF and doesn't
		323	// fragment for me sometimes.
		324	{
		325	int oval = IP_PMTUDISC_DONT;
		326	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
167	}	327	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#endif	328	# endif
		329
		330	// standard daemon practise...
		331	{
		332	int oval = 1;
		333	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		334	}
		335
		336	sockinfo si (THISNODE->dns_hostname,
		337	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		338	PROT_DNSv4);
		339
		340	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		341	{
		342	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		343	return -1;
		344	}
		345
		346	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		347	++success;
		348	}
		349	#endif
		350
		351	/////////////////////////////////////////////////////////////////////////////
		352
		353	if (!success)
		354	{
		355	slog (L_ERR, _("no protocols enabled."));
		356	return -1;
		357	}
		358
		359	reconnect_all ();
		360
		361	/////////////////////////////////////////////////////////////////////////////
172		362
173	tap = new tap_device ();	363	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
175	{	365	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
177	exit (1);	367	return -1;
178	}	368	}
179		369
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
181		371
		372	run_script_cb cb;
		373	cb.set<vpn, &vpn::script_if_init> (this);
		374
		375	if (tap->if_up () &&
		376	!run_script (cb, true))
		377	{
		378	slog (L_ERR, _("interface initialization command '%s' failed."),
		379	tap->if_up ());
		380	return -1;
		381	}
		382
		383	cb.set<vpn, &vpn::script_if_up> (this);
		384	if (!run_script (cb, true))
		385	{
		386	slog (L_ERR, _("if-up command execution failed."));
		387	return -1;
		388	}
		389
182	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		391
186	return 0;	392	return 0;
187	}
188
189	// send a vpn packet out to other hosts
190	bool
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	return send_ipv4_packet (pkt, si, tos);
197
198	case PROT_UDPv4:
199	return send_udpv4_packet (pkt, si, tos);
200
201	#if ENABLE_TCP
202	case PROT_TCPv4:
203	return send_tcpv4_packet (pkt, si, tos);
204	#endif
205
206	default:
207	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
208	return false;
209	}
210	}	393	}
211		394
212	bool	395	bool
213	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	396	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
214	{	397	{
215	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	398	set_tos (ipv4_fd, ipv4_tos, tos);
216	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
217		400
218	return true;	401	return true;
219	}	402	}
		403
		404	static u16
		405	ipv4_checksum (u16 *data, unsigned int len)
		406	{
		407	// use 32 bit accumulator and fold back carry bits at the end
		408	u32 sum = 0;
		409
		410	while (len > 1)
		411	{
		412	sum += *data++;
		413	len -= 2;
		414	}
		415
		416	// odd byte left?
		417	if (len)
		418	sum += (u8 )data;
		419
		420	// add back carry bits
		421	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		422	sum += (sum >> 16); // carry
		423
		424	return ~sum;
		425	}
		426
		427	#if ENABLE_ICMP
		428	bool
		429	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		430	{
		431	pkt->unshift_hdr (4);
		432
		433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		434	hdr->type = ::conf.icmp_type;
		435	hdr->code = 255;
		436	hdr->checksum = 0;
		437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
		440	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		441
		442	return true;
		443	}
		444	#endif
220		445
221	bool	446	bool
222	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	447	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
223	{	448	{
224	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	449	set_tos (udpv4_fd, udpv4_tos, tos);
225	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
226		451
227	return true;	452	return true;
		453	}
		454
		455	void
		456	vpn::inject_data_packet (tap_packet *pkt, int dst)
		457	{
		458	if (dst)
		459	{
		460	// unicast
		461	if (dst != THISNODE->id)
		462	conns[dst - 1]->inject_data_packet (pkt);
		463	}
		464	else
		465	{
		466	// broadcast, this is ugly, but due to the security policy
		467	// we have to connect to all hosts...
		468	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		469	if ((*c)->conf != THISNODE)
		470	(*c)->inject_data_packet (pkt);
		471	}
228	}	472	}
229		473
230	void	474	void
231	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
232	{	476	{
233	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
234	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
235		479
236	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	480	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
237	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
238		482
239	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
240	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
241	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
242	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	486	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
243	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
244	else if (dst > conns.size ())	488	else if (dst > conns.size ())
245	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	489	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else	491	else
248	{	492	{
249	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
250		494
251	if (dst == 0 && !THISNODE->routerprio)	495	if (dst == 0)
252	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
253	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
254	else if (dst != 0 && dst != THISNODE->id)	498	else if (dst != THISNODE->id)
255	{	499	{
256	if (THISNODE->routerprio)	500	if (THISNODE->routerprio)
257	// the tos setting gets lost here. who cares.	501	// the tos setting gets lost here. who cares.
258	conns[dst - 1]->inject_vpn_packet (pkt);	502	conns[dst - 1]->inject_vpn_packet (pkt);
259	else	503	else
260	slog (L_WARN,	504	slog (L_WARN,
261	_("%s(%s): forwarding request (=> %s), but we are no router"),	505	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
262	c->conf->nodename, (const char *)rsi,	506	c->conf->nodename, (const char *)rsi,
263	conns[dst - 1]->conf->nodename);	507	conns[dst - 1]->conf->nodename);
264	}	508	}
265	else	509	else
266	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
267	}	511	}
268	}	512	}
269		513
270	void	514	bool
271	vpn::udpv4_ev (io_watcher &w, short revents)	515	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
272	{	516	{
273	if (revents & (POLLIN \| POLLERR))	517	switch (si.prot)
		518	{
		519	case PROT_IPv4:
		520	return send_ipv4_packet (pkt, si, tos);
		521
		522	case PROT_UDPv4:
		523	return send_udpv4_packet (pkt, si, tos);
		524
		525	#if ENABLE_TCP
		526	case PROT_TCPv4:
		527	return send_tcpv4_packet (pkt, si, tos);
		528	#endif
		529	#if ENABLE_ICMP
		530	case PROT_ICMPv4:
		531	return send_icmpv4_packet (pkt, si, tos);
		532	#endif
		533	#if ENABLE_DNS
		534	case PROT_DNSv4:
		535	return send_dnsv4_packet (pkt, si, tos);
		536	#endif
		537	default:
		538	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		539	}
		540
		541	return false;
		542	}
		543
		544	inline void
		545	vpn::ipv4_ev (ev::io &w, int revents)
		546	{
		547	if (revents & EV_READ)
274	{	548	{
275	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
276	struct sockaddr_in sa;	550	struct sockaddr_in sa;
277	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
278	int len;	552	int len;
279		553
280	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	554	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
281		555
282	sockinfo si(sa, PROT_UDPv4);	556	sockinfo si(sa, PROT_IPv4);
283		557
284	if (len > 0)	558	if (len > 0)
285	{	559	{
286	pkt->len = len;	560	pkt->len = len;
287		561
		562	// raw sockets deliver the ipv4 header, but don't expect it on sends
		563	pkt->skip_hdr (IP_OVERHEAD);
		564
288	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
289	}	566	}
290	else	567	else
291	{	568	{
292	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
293	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
294	}	571	}
295		572
296	delete pkt;	573	delete pkt;
297	}	574	}
298	else if (revents & POLLHUP)
299	{
300	// this cannot ;) happen on udp sockets
301	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
302	exit (1);
303	}
304	else	575	else
305	{	576	{
306	slog (L_ERR,	577	slog (L_ERR,
307	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
308	revents);	579	revents);
309	exit (1);	580	exit (EXIT_FAILURE);
310	}	581	}
311	}	582	}
312		583
313	void	584	#if ENABLE_ICMP
		585	inline void
314	vpn::ipv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
315	{	587	{
316	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
317	{	589	{
318	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
319	struct sockaddr_in sa;	591	struct sockaddr_in sa;
320	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
321	int len;	593	int len;
322		594
323	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	595	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
324		596
325	sockinfo si(sa, PROT_IPv4);	597	sockinfo si(sa, PROT_ICMPv4);
326		598
327	if (len > 0)	599	if (len > 0)
328	{	600	{
329	pkt->len = len;	601	pkt->len = len;
330		602
		603	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		604
		605	if (hdr->type == ::conf.icmp_type
		606	&& hdr->code == 255)
		607	{
331	// raw sockets deliver the ipv4, but don't expect it on sends	608	// raw sockets deliver the ipv4, but don't expect it on sends
332	// this is slow, but...	609	// this is slow, but...
333	pkt->skip_hdr (IP_OVERHEAD);	610	pkt->skip_hdr (ICMP_OVERHEAD);
		611
		612	recv_vpn_packet (pkt, si);
		613	}
		614	}
		615	else
		616	{
		617	// probably ECONNRESET or somesuch
		618	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		619	}
		620
		621	delete pkt;
		622	}
		623	else
		624	{
		625	slog (L_ERR,
		626	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		627	revents);
		628	exit (EXIT_FAILURE);
		629	}
		630	}
		631	#endif
		632
		633	inline void
		634	vpn::udpv4_ev (ev::io &w, int revents)
		635	{
		636	if (revents & EV_READ)
		637	{
		638	vpn_packet *pkt = new vpn_packet;
		639	struct sockaddr_in sa;
		640	socklen_t sa_len = sizeof (sa);
		641	int len;
		642
		643	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		644
		645	sockinfo si(sa, PROT_UDPv4);
		646
		647	if (len > 0)
		648	{
		649	pkt->len = len;
334		650
335	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
336	}	652	}
337	else	653	else
338	{	654	{
339	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
340	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	656	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
341	}	657	}
342		658
343	delete pkt;	659	delete pkt;
344	}	660	}
345	else if (revents & POLLHUP)
346	{
347	// this cannot ;) happen on udp sockets
348	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
349	exit (1);
350	}
351	else	661	else
352	{	662	{
353	slog (L_ERR,	663	slog (L_ERR,
354	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
355	revents);	665	revents);
356	exit (1);	666	exit (EXIT_FAILURE);
357	}	667	}
358	}	668	}
359		669
360	void	670	inline void
361	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
362	{	672	{
363	if (revents & POLLIN)	673	if (revents & EV_READ)
364	{	674	{
365	/* process data */	675	/* process data */
366	tap_packet *pkt;	676	tap_packet *pkt;
367		677
368	pkt = tap->recv ();	678	pkt = tap->recv ();
369		679
		680	if (!pkt)
		681	return;
		682
		683	if (pkt->len > 14)
		684	{
370	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
371	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
372		687
373	if (src != THISNODE->id)	688	if (src != THISNODE->id)
374	{
375	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
376	exit (1);
377	}
378
379	if (dst == THISNODE->id)
380	{
381	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
382	exit (1);
383	}
384
385	if (dst > conns.size ())
386	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else
388	{
389	if (dst)
390	{	689	{
391	// unicast	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
392	if (dst != THISNODE->id)	691	exit (EXIT_FAILURE);
393	conns[dst - 1]->inject_data_packet (pkt);
394	}	692	}
		693
		694	if (dst == THISNODE->id)
		695	{
		696	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		697	exit (EXIT_FAILURE);
		698	}
		699
		700	if (dst > conns.size ())
		701	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
395	else	702	else
396	{
397	// broadcast, first check router, then self, then english
398	connection *router = find_router ();
399
400	if (router)
401	router->inject_data_packet (pkt, true);	703	inject_data_packet (pkt, dst);
402	else
403	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
404	if ((*c)->conf != THISNODE)
405	(*c)->inject_data_packet (pkt);
406	}
407	}	704	}
408		705
409	delete pkt;	706	delete pkt;
410	}	707	}
411	else if (revents & (POLLHUP \| POLLERR))
412	{
413	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
414	exit (1);
415	}
416	else	708	else
417	abort ();	709	abort ();
418	}	710	}
419		711
420	void	712	inline void
421	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
422	{	714	{
423	if (events)	715	if (events)
424	{	716	{
425	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
426	{	718	{
427	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
428		720
429	shutdown_all ();	721	shutdown_all ();
430
431	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
432
433	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
434		724	exit (EXIT_SUCCESS);
435	exit (0);
436	}	725	}
437		726
438	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
439	{	728	{
440	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
441		730
442	reconnect_all ();	731	reconnect_all ();
443	}	732	}
444		733
445	events = 0;	734	events = 0;
446	}	735	}
447
448	w.at = TSTAMP_CANCEL;
449	}	736	}
450		737
451	void	738	void
452	vpn::shutdown_all ()	739	vpn::shutdown_all ()
453	{	740	{
…		…
463		750
464	conns.clear ();	751	conns.clear ();
465		752
466	connection_init ();	753	connection_init ();
467		754
468	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
469	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
470	{
471	connection *conn = new connection (this);
472		757
473	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
474	conns.push_back (conn);
475
476	conn->establish_connection ();	759	(*c)->establish_connection ();
477	}
478	}	760	}
479		761
480	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
481	{	763	{
482	u32 prio = 0;	764	return src != dst
		765	&& src->may_direct (dst)
		766	&& dst->may_direct (src)
		767	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		768	\|\| (src->protocols & dst->connectable_protocols ()));
		769	}
		770
		771	// only works for indirect and routed connections: find a router
		772	// from THISNODE to dst
		773	connection vpn::find_router_for (const connection dst)
		774	{
483	connection *router = 0;	775	connection *router = 0;
484		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 vpn::connection_established (connection *c)
		823	{
485	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
486	{	825	{
487	connection c = i;	826	connection o = i;
488		827
489	if (c->conf->routerprio > prio	828	if (!o->is_direct
490	&& c->connectmode == conf_node::C_ALWAYS	829	&& o->si.valid ()
491	&& c->conf != THISNODE	830	&& c->si != o->si
492	&& c->ictx && c->octx)	831	&& c == find_router_for (o))
493	{
494	prio = c->conf->routerprio;
495	router = c;
496	}	832	{
		833	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		834	o->conf->nodename, c->conf->nodename);
		835	o->rekey ();
		836	}
497	}	837	}
498
499	return router;
500	}	838	}
501		839
502	void vpn::send_connect_request (int id)	840	void vpn::send_connect_request (connection *c)
503	{	841	{
504	connection *c = find_router ();	842	connection *r = find_router_for (c);
505		843
506	if (c)	844	if (r)
		845	{
		846	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		847	c->conf->nodename, r->conf->nodename);
507	c->send_connect_request (id);	848	r->send_connect_request (c->conf->id);
		849	}
508	else	850	else
509	// no router found, aggressively connect to all routers	851	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
510	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	c->conf->nodename);
511	if ((*i)->conf->routerprio)
512	(*i)->establish_connection ();
513	}	853	}
514		854
515	void	855	void
516	connection::dump_status ()	856	connection::dump_status ()
517	{	857	{
518	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
519	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
520	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
521	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	861	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
522	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
523	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
524	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
525	}	863	}
526		864
527	void	865	void
528	vpn::dump_status ()	866	vpn::dump_status ()
529	{	867	{
530	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
531		869
532	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
533	(*c)->dump_status ();	871	(*c)->dump_status ();
534		872
535	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
536	}	874	}
537		875
538	vpn::vpn (void)	876	vpn::vpn (void)
539	: event(this, &vpn::event_cb)	877	{
		878	event .set<vpn, &vpn::event_cb > (this);
540	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
541	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
542	, tap_ev_watcher (this, &vpn::tap_ev)
543	#if ENABLE_TCP	881	#if ENABLE_TCP
544	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
545	#endif	883	#endif
546	{	884	#if ENABLE_ICMP
		885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		886	#endif
		887	#if ENABLE_DNS
		888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
547	}	891	}
548		892
549	vpn::~vpn ()	893	vpn::~vpn ()
550	{	894	{
551	}	895	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs. Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC