[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 1.54 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	}	393	}
188		394
189	// send a vpn packet out to other hosts	395	bool
		396	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		397	{
		398	set_tos (ipv4_fd, ipv4_tos, tos);
		399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		400
		401	return true;
		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
		445
		446	bool
		447	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		448	{
		449	set_tos (udpv4_fd, udpv4_tos, tos);
		450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		451
		452	return true;
		453	}
		454
190	void	455	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	456	vpn::inject_data_packet (tap_packet *pkt, int dst)
192	{	457	{
193	switch (si.prot)	458	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	}	459	{
213	}	460	// unicast
214		461	if (dst != THISNODE->id)
215	void	462	conns[dst - 1]->inject_data_packet (pkt);
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	463	}
217	{	464	else
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	465	{
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	466	// broadcast, this is ugly, but due to the security policy
220	}	467	// we have to connect to all hosts...
221		468	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
222	void	469	if ((*c)->conf != THISNODE)
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	470	(*c)->inject_data_packet (pkt);
224	{	471	}
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	}	472	}
228		473
229	void	474	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	476	{
232	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
233	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
234		479
235	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."),
236	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
237		482
238	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	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)."),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		488	else if (dst > conns.size ())
		489	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
		490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	491	else
244	{	492	{
245	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
246		494
247	if (dst == 0 && !THISNODE->routerprio)	495	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
249	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	498	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	499	{
		500	if (THISNODE->routerprio)
		501	// the tos setting gets lost here. who cares.
		502	conns[dst - 1]->inject_vpn_packet (pkt);
		503	else
252	slog (L_WARN,	504	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	505	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		506	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	507	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	508	}
256	THISNODE->id, THISNODE->nodename);
257	else	509	else
258	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
259	}	511	}
260	}	512	}
261		513
262	void	514	bool
263	vpn::udpv4_ev (io_watcher &w, short revents)	515	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
264	{	516	{
265	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)
266	{	548	{
267	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	550	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
270	int len;	552	int len;
271		553
272	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);
273		555
274	sockinfo si(sa, PROT_UDPv4);	556	sockinfo si(sa, PROT_IPv4);
275		557
276	if (len > 0)	558	if (len > 0)
277	{	559	{
278	pkt->len = len;	560	pkt->len = len;
279		561
		562	// raw sockets deliver the ipv4 header, but don't expect it on sends
		563	pkt->skip_hdr (IP_OVERHEAD);
		564
280	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
281	}	566	}
282	else	567	else
283	{	568	{
284	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
285	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));
286	}	571	}
287		572
288	delete pkt;	573	delete pkt;
289	}	574	}
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	575	else
297	{	576	{
298	slog (L_ERR,	577	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
300	revents);	579	revents);
301	exit (1);	580	exit (EXIT_FAILURE);
302	}	581	}
303	}	582	}
304		583
305	void	584	#if ENABLE_ICMP
		585	inline void
306	vpn::ipv4_ev (io_watcher &w, short revents)	586	vpn::icmpv4_ev (ev::io &w, int revents)
307	{	587	{
308	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
309	{	589	{
310	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	591	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
313	int len;	593	int len;
314		594
315	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);
316		596
317	sockinfo si(sa, PROT_IPv4);	597	sockinfo si(sa, PROT_ICMPv4);
318		598
319	if (len > 0)	599	if (len > 0)
320	{	600	{
321	pkt->len = len;	601	pkt->len = len;
322		602
		603	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		604
		605	if (hdr->type == ::conf.icmp_type
		606	&& hdr->code == 255)
		607	{
323	// 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
324	// this is slow, but...	609	// this is slow, but...
325	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;
326		650
327	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
328	}	652	}
329	else	653	else
330	{	654	{
331	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
332	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));
333	}	657	}
334		658
335	delete pkt;	659	delete pkt;
336	}	660	}
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	661	else
344	{	662	{
345	slog (L_ERR,	663	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
347	revents);	665	revents);
348	exit (1);	666	exit (EXIT_FAILURE);
349	}	667	}
350	}	668	}
351		669
352	void	670	inline void
353	vpn::tap_ev (io_watcher &w, short revents)	671	vpn::tap_ev (ev::io &w, int revents)
354	{	672	{
355	if (revents & POLLIN)	673	if (revents & EV_READ)
356	{	674	{
357	/* process data */	675	/* process data */
358	tap_packet *pkt;	676	tap_packet *pkt;
359		677
360	pkt = tap->recv ();	678	pkt = tap->recv ();
361		679
		680	if (!pkt)
		681	return;
		682
		683	if (pkt->len > 14)
		684	{
362	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
364		687
365	if (src != THISNODE->id)	688	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	{	689	{
383	// unicast	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
384	if (dst != THISNODE->id)	691	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	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);
387	else	702	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);	703	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	}	704	}
400		705
401	delete pkt;	706	delete pkt;
402	}	707	}
403	else if (revents & (POLLHUP \| POLLERR))
404	{
405	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
406	exit (1);
407	}
408	else	708	else
409	abort ();	709	abort ();
410	}	710	}
411		711
412	void	712	inline void
413	vpn::event_cb (time_watcher &w)	713	vpn::event_cb (ev::timer &w, int)
414	{	714	{
415	if (events)	715	if (events)
416	{	716	{
417	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
418	{	718	{
419	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
420		720
421	shutdown_all ();	721	shutdown_all ();
422
423	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
426		724	exit (EXIT_SUCCESS);
427	exit (0);
428	}	725	}
429		726
430	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
431	{	728	{
432	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
433		730
434	reconnect_all ();	731	reconnect_all ();
435	}	732	}
436		733
437	events = 0;	734	events = 0;
438	}	735	}
439
440	w.at = TSTAMP_CANCEL;
441	}	736	}
442		737
443	void	738	void
444	vpn::shutdown_all ()	739	vpn::shutdown_all ()
445	{	740	{
…		…
455		750
456	conns.clear ();	751	conns.clear ();
457		752
458	connection_init ();	753	connection_init ();
459		754
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
461	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
462	{
463	connection *conn = new connection (this);
464		757
465	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
466	conns.push_back (conn);
467
468	conn->establish_connection ();	759	(*c)->establish_connection ();
469	}
470	}	760	}
471		761
472	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
473	{	763	{
474	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	{
475	connection *router = 0;	775	connection *router = 0;
476		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	{
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	825	{
479	connection c = i;	826	connection o = i;
480		827
481	if (c->conf->routerprio > prio	828	if (!o->is_direct
482	&& c->connectmode == conf_node::C_ALWAYS	829	&& o->si.valid ()
483	&& c->conf != THISNODE	830	&& c->si != o->si
484	&& c->ictx && c->octx)	831	&& c == find_router_for (o))
485	{
486	prio = c->conf->routerprio;
487	router = c;
488	}	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	}
489	}	837	}
490
491	return router;
492	}	838	}
493		839
494	void vpn::connect_request (int id)	840	void vpn::send_connect_request (connection *c)
495	{	841	{
496	connection *c = find_router ();	842	connection *r = find_router_for (c);
497		843
498	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);
499	c->connect_request (id);	848	r->send_connect_request (c->conf->id);
500	//else // does not work, because all others must connect to the same router	849	}
501	// // no router found, aggressively connect to all routers	850	else
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	851	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
503	// if ((*i)->conf->routerprio)	852	c->conf->nodename);
504	// (*i)->establish_connection ();
505	}	853	}
506		854
507	void	855	void
508	connection::dump_status ()	856	connection::dump_status ()
509	{	857	{
510	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
511	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
512	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
513	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"),
514	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(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	}	863	}
518		864
519	void	865	void
520	vpn::dump_status ()	866	vpn::dump_status ()
521	{	867	{
522	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
523		869
524	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
525	(*c)->dump_status ();	871	(*c)->dump_status ();
526		872
527	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
528	}	874	}
529		875
530	vpn::vpn (void)	876	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	877	{
		878	event .set<vpn, &vpn::event_cb > (this);
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	881	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
537	#endif	883	#endif
538	{	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);
539	}	891	}
540		892
541	vpn::~vpn ()	893	vpn::~vpn ()
542	{	894	{
543	}	895	}

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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 1.54 by pcg, Mon Mar 23 15:22:00 2009 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 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC