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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 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 (int)	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;
71	}	122	}
72		123
73	int	124	int
74	vpn::setup ()	125	vpn::setup ()
75	{	126	{
76	sockinfo si;	127	ipv4_tos = -1;
77
78	si.set (THISNODE);
79
80	udpv4_fd = -1;	128	ipv4_fd = -1;
81		129
82	if (THISNODE->protocols & PROT_UDPv4)	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
83	{	131	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
85		133
86	if (udpv4_fd < 0)	134	if (ipv4_fd < 0)
87	return -1;	135	return -1;
88		136
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
90	{	138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
92	exit (1);
93	}
94		139
95	#ifdef IP_MTU_DISCOVER	140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	141	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	142	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	143	// fragment for me sometimes.
99	{	144	{
100	int oval = IP_PMTUDISC_DONT;	145	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	146	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		147	}
		148	#endif
		149
		150	sockinfo si (THISNODE, PROT_IPv4);
		151
		152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		153	{
		154	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		155	exit (EXIT_FAILURE);
102	}	156	}
103	#endif	157
		158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		159	}
		160
		161	udpv4_tos = -1;
		162	udpv4_fd = -1;
		163
		164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		165	{
		166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		167
		168	if (udpv4_fd < 0)
		169	return -1;
		170
		171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
104		173
105	// standard daemon practise...	174	// standard daemon practise...
106	{	175	{
107	int oval = 1;	176	int oval = 1;
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
109	}	178	}
110		179
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	180	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
112	}
113
114	ipv4_fd = -1;
115	if (THISNODE->protocols & PROT_IPv4)
116	{
117	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
118
119	if (ipv4_fd < 0)
120	return -1;
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{
124	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
125	exit (1);
126	}
127
128	#ifdef IP_MTU_DISCOVER
129	// this I really consider a linux bug. I am neither connected	181	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	182	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	183	// fragment for me sometimes.
132	{	184	{
133	int oval = IP_PMTUDISC_DONT;	185	int oval = IP_PMTUDISC_DONT;
		186	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		187	}
		188	#endif
		189
		190	sockinfo si (THISNODE, PROT_UDPv4);
		191
		192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		193	{
		194	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		195	exit (EXIT_FAILURE);
		196	}
		197
		198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		199	}
		200
		201	icmpv4_tos = -1;
		202	icmpv4_fd = -1;
		203
		204	#if ENABLE_ICMP
		205	if (THISNODE->protocols & PROT_ICMPv4)
		206	{
		207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		208
		209	if (icmpv4_fd < 0)
		210	return -1;
		211
		212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		214
		215	#ifdef ICMP_FILTER
		216	{
		217	icmp_filter oval;
		218	oval.data = 0xffffffff;
		219	if (::conf.icmp_type < 32)
		220	oval.data &= ~(1 << ::conf.icmp_type);
		221
		222	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
		223	}
		224	#endif
		225
		226	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		227	// this I really consider a linux bug. I am neither connected
		228	// nor do I fragment myself. Linux still sets DF and doesn't
		229	// fragment for me sometimes.
		230	{
		231	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		233	}
		234	#endif
		235
		236	sockinfo si (THISNODE, PROT_ICMPv4);
		237
		238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		239	{
		240	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		241	exit (EXIT_FAILURE);
135	}	242	}
		243
		244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		245	}
		246	#endif
		247
		248	tcpv4_fd = -1;
		249
		250	#if ENABLE_TCP
		251	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		252	{
		253	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		254
		255	if (tcpv4_fd < 0)
		256	return -1;
		257
		258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		260
		261	// standard daemon practise...
		262	{
		263	int oval = 1;
		264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		265	}
		266
		267	sockinfo si (THISNODE, PROT_TCPv4);
		268
		269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		270	{
		271	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		272	exit (EXIT_FAILURE);
		273	}
		274
		275	if (listen (tcpv4_fd, 5))
		276	{
		277	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		278	exit (EXIT_FAILURE);
		279	}
		280
		281	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		282	}
		283	#endif
		284
		285	dnsv4_tos = -1;
		286	dnsv4_fd = -1;
		287
		288	#if ENABLE_DNS
		289	if (THISNODE->protocols & PROT_DNSv4)
		290	{
		291	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		292
		293	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		294
		295	if (dnsv4_fd < 0)
		296	return -1;
		297
		298	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		299	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		300
		301	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		302	// this I really consider a linux bug. I am neither connected
		303	// nor do I fragment myself. Linux still sets DF and doesn't
		304	// fragment for me sometimes.
		305	{
		306	int oval = IP_PMTUDISC_DONT;
		307	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		308	}
136	#endif	309	# endif
137		310
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	311	// standard daemon practise...
		312	{
		313	int oval = 1;
		314	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	315	}
		316
		317	sockinfo si (THISNODE->dns_hostname,
		318	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		319	PROT_DNSv4);
		320
		321	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		322	{
		323	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		324	exit (EXIT_FAILURE);
		325	}
		326
		327	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		328	}
		329	#endif
		330
		331	/////////////////////////////////////////////////////////////////////////////
		332
		333	reconnect_all ();
		334
		335	/////////////////////////////////////////////////////////////////////////////
140		336
141	tap = new tap_device ();	337	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
143	{	339	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname);
145	exit (1);	341	exit (EXIT_FAILURE);
146	}	342	}
147		343
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
149		345
		346	run_script_cb cb;
		347	cb.set<vpn, &vpn::script_if_init> (this);
		348
		349	if (tap->if_up () &&
		350	!run_script (cb, true))
		351	{
		352	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		353	tap->if_up ());
		354	exit (EXIT_FAILURE);
		355	}
		356
		357	cb.set<vpn, &vpn::script_if_up> (this);
		358	if (!run_script (cb, true))
		359	{
		360	slog (L_ERR, _("if-up command execution failed, exiting."));
		361	exit (EXIT_FAILURE);
		362	}
		363
150	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
151
152	reconnect_all ();
153		365
154	return 0;	366	return 0;
155	}	367	}
156		368
		369	bool
		370	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		371	{
		372	set_tos (ipv4_fd, ipv4_tos, tos);
		373	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		374
		375	return true;
		376	}
		377
		378	static u16
		379	ipv4_checksum (u16 *data, unsigned int len)
		380	{
		381	// use 32 bit accumulator and fold back carry bits at the end
		382	u32 sum = 0;
		383
		384	while (len > 1)
		385	{
		386	sum += *data++;
		387	len -= 2;
		388	}
		389
		390	// odd byte left?
		391	if (len)
		392	sum += (u8 )data;
		393
		394	// add back carry bits
		395	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		396	sum += (sum >> 16); // carry
		397
		398	return ~sum;
		399	}
		400
		401	#if ENABLE_ICMP
		402	bool
		403	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		404	{
		405	pkt->unshift_hdr (4);
		406
		407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		408	hdr->type = ::conf.icmp_type;
		409	hdr->code = 255;
		410	hdr->checksum = 0;
		411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
		414	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		415
		416	return true;
		417	}
		418	#endif
		419
		420	bool
		421	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		422	{
		423	set_tos (udpv4_fd, udpv4_tos, tos);
		424	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		425
		426	return true;
		427	}
		428
157	void	429	void
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	430	vpn::inject_data_packet (tap_packet *pkt, int dst)
159	{	431	{
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	432	if (dst)
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	433	{
162	}	434	// unicast
163		435	if (dst != THISNODE->id)
164	void	436	conns[dst - 1]->inject_data_packet (pkt);
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	437	}
166	{	438	else
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	439	{
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	440	// broadcast, this is ugly, but due to the security policy
		441	// we have to connect to all hosts...
		442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		443	if ((*c)->conf != THISNODE)
		444	(*c)->inject_data_packet (pkt);
		445	}
169	}	446	}
170		447
171	void	448	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	450	{
174	unsigned int src = pkt->src ();	451	unsigned int src = pkt->src ();
175	unsigned int dst = pkt->dst ();	452	unsigned int dst = pkt->dst ();
176		453
177	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	454	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
178	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	455	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
179		456
180	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	460	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
		461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		462	else if (dst > conns.size ())
		463	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	465	else
186	{	466	{
187	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
188		468
189	if (dst == 0 && !THISNODE->routerprio)	469	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
191	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	473	{
		474	if (THISNODE->routerprio)
		475	// the tos setting gets lost here. who cares.
		476	conns[dst - 1]->inject_vpn_packet (pkt);
		477	else
194	slog (L_WARN,	478	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	479	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		480	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	481	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	482	}
198	THISNODE->id, THISNODE->nodename);
199	else	483	else
200	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
201	}	485	}
202	}	486	}
203		487
204	void	488	bool
205	vpn::udpv4_ev (short revents)	489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	490	{
207	if (revents & (POLLIN \| POLLERR))	491	switch (si.prot)
		492	{
		493	case PROT_IPv4:
		494	return send_ipv4_packet (pkt, si, tos);
		495
		496	case PROT_UDPv4:
		497	return send_udpv4_packet (pkt, si, tos);
		498
		499	#if ENABLE_TCP
		500	case PROT_TCPv4:
		501	return send_tcpv4_packet (pkt, si, tos);
		502	#endif
		503	#if ENABLE_ICMP
		504	case PROT_ICMPv4:
		505	return send_icmpv4_packet (pkt, si, tos);
		506	#endif
		507	#if ENABLE_DNS
		508	case PROT_DNSv4:
		509	return send_dnsv4_packet (pkt, si, tos);
		510	#endif
		511	default:
		512	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		513	}
		514
		515	return false;
		516	}
		517
		518	inline void
		519	vpn::ipv4_ev (ev::io &w, int revents)
		520	{
		521	if (revents & EV_READ)
208	{	522	{
209	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	524	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
212	int len;	526	int len;
213		527
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	528	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		529
216	sockinfo si(sa);	530	sockinfo si(sa, PROT_IPv4);
217		531
218	if (len > 0)	532	if (len > 0)
219	{	533	{
220	pkt->len = len;	534	pkt->len = len;
221		535
		536	// raw sockets deliver the ipv4 header, but don't expect it on sends
		537	pkt->skip_hdr (IP_OVERHEAD);
		538
222	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
223	}	540	}
224	else	541	else
225	{	542	{
226	// probably ECONNRESET or somesuch	543	// probably ECONNRESET or somesuch
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
228	}	545	}
229		546
230	delete pkt;	547	delete pkt;
231	}	548	}
232	else if (revents & POLLHUP)
233	{
234	// this cannot ;) happen on udp sockets
235	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
236	exit (1);
237	}
238	else	549	else
239	{	550	{
240	slog (L_ERR,	551	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, exiting.\n"),
242	revents);	553	revents);
243	exit (1);	554	exit (EXIT_FAILURE);
244	}	555	}
245	}	556	}
246		557
247	void	558	#if ENABLE_ICMP
248	vpn::ipv4_ev (short revents)	559	inline void
		560	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	561	{
250	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
251	{	563	{
252	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	565	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
255	int len;	567	int len;
256		568
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	569	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		570
259	sockinfo si(sa, PROT_IPv4);	571	sockinfo si(sa, PROT_ICMPv4);
260		572
261	if (len > 0)	573	if (len > 0)
262	{	574	{
263	pkt->len = len;	575	pkt->len = len;
264		576
		577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		578
		579	if (hdr->type == ::conf.icmp_type
		580	&& hdr->code == 255)
		581	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	582	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	583	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	584	pkt->skip_hdr (ICMP_OVERHEAD);
		585
		586	recv_vpn_packet (pkt, si);
		587	}
		588	}
		589	else
		590	{
		591	// probably ECONNRESET or somesuch
		592	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		593	}
		594
		595	delete pkt;
		596	}
		597	else
		598	{
		599	slog (L_ERR,
		600	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		601	revents);
		602	exit (EXIT_FAILURE);
		603	}
		604	}
		605	#endif
		606
		607	inline void
		608	vpn::udpv4_ev (ev::io &w, int revents)
		609	{
		610	if (revents & EV_READ)
		611	{
		612	vpn_packet *pkt = new vpn_packet;
		613	struct sockaddr_in sa;
		614	socklen_t sa_len = sizeof (sa);
		615	int len;
		616
		617	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		618
		619	sockinfo si(sa, PROT_UDPv4);
		620
		621	if (len > 0)
		622	{
		623	pkt->len = len;
268		624
269	recv_vpn_packet (pkt, si);	625	recv_vpn_packet (pkt, si);
270	}	626	}
271	else	627	else
272	{	628	{
273	// probably ECONNRESET or somesuch	629	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	630	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
275	}	631	}
276		632
277	delete pkt;	633	delete pkt;
278	}	634	}
279	else if (revents & POLLHUP)
280	{
281	// this cannot ;) happen on udp sockets
282	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
283	exit (1);
284	}
285	else	635	else
286	{	636	{
287	slog (L_ERR,	637	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	638	_("FATAL: unknown revents %08x in socket, exiting.\n"),
289	revents);	639	revents);
290	exit (1);	640	exit (EXIT_FAILURE);
291	}	641	}
292	}	642	}
293		643
294	void	644	inline void
295	vpn::tap_ev (short revents)	645	vpn::tap_ev (ev::io &w, int revents)
296	{	646	{
297	if (revents & POLLIN)	647	if (revents & EV_READ)
298	{	648	{
299	/* process data */	649	/* process data */
300	tap_packet *pkt;	650	tap_packet *pkt;
301		651
302	pkt = tap->recv ();	652	pkt = tap->recv ();
303		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
304	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
306		661
307	if (src != THISNODE->id)	662	if (src != THISNODE->id)
308	{
309	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
310	exit (1);
311	}
312
313	if (dst == THISNODE->id)
314	{
315	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
316	exit (1);
317	}
318
319	if (dst > conns.size ())
320	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
321	else
322	{
323	if (dst)
324	{	663	{
325	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	666	}
		667
		668	if (dst == THISNODE->id)
		669	{
		670	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		671	exit (EXIT_FAILURE);
		672	}
		673
		674	if (dst > conns.size ())
		675	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	676	else
330	{
331	// broadcast, first check router, then self, then english
332	connection *router = find_router ();
333
334	if (router)
335	router->inject_data_packet (pkt, true);	677	inject_data_packet (pkt, dst);
336	else
337	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
338	if ((*c)->conf != THISNODE)
339	(*c)->inject_data_packet (pkt);
340	}
341	}	678	}
342		679
343	delete pkt;	680	delete pkt;
344	}
345	else if (revents & (POLLHUP \| POLLERR))
346	{
347	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
348	exit (1);
349	}	681	}
350	else	682	else
351	abort ();	683	abort ();
352	}	684	}
353		685
354	void	686	inline void
355	vpn::event_cb (tstamp &ts)	687	vpn::event_cb (ev::timer &w, int)
356	{	688	{
357	if (events)	689	if (events)
358	{	690	{
359	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
360	{	692	{
361	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
362		694
363	shutdown_all ();	695	shutdown_all ();
364
365	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("exiting."));
368		698	exit (EXIT_SUCCESS);
369	exit (0);
370	}	699	}
371		700
372	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
373	{	702	{
374	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect."));
375		704
376	reconnect_all ();	705	reconnect_all ();
377	}	706	}
378		707
379	events = 0;	708	events = 0;
380	}	709	}
381
382	ts = TSTAMP_CANCEL;
383	}	710	}
384		711
385	void	712	void
386	vpn::shutdown_all ()	713	vpn::shutdown_all ()
387	{	714	{
397		724
398	conns.clear ();	725	conns.clear ();
399		726
400	connection_init ();	727	connection_init ();
401		728
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
403	i != conf.nodes.end (); ++i)	730	conns.push_back (new connection (this, *i));
404	{
405	connection *conn = new connection (this);
406		731
407	conn->conf = *i;	732	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
408	conns.push_back (conn);
409
410	conn->establish_connection ();	733	(*c)->establish_connection ();
411	}
412	}	734	}
413		735
414	connection *vpn::find_router ()	736	bool vpn::can_direct (conf_node src, conf_node dst) const
415	{	737	{
416	u32 prio = 0;	738	return src != dst
		739	&& src->may_direct (dst)
		740	&& dst->may_direct (src)
		741	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		742	\|\| (src->protocols & dst->connectable_protocols ()));
		743	}
		744
		745	// only works for indirect and routed connections: find a router
		746	// from THISNODE to dst
		747	connection vpn::find_router_for (const connection dst)
		748	{
417	connection *router = 0;	749	connection *router = 0;
418		750
		751	// first try to find a router with a direct connection
		752	{
		753	u32 prio = 1;
		754
		755	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		756	{
		757	connection c = i;
		758
		759	if (c->conf->routerprio > prio
		760	&& c->conf != THISNODE
		761	&& c != dst
		762	&& can_direct (c->conf, dst->conf))
		763	{
		764	if (c->ictx && c->octx)
		765	{
		766	prio = c->conf->routerprio;
		767	router = c;
		768	}
		769	else
		770	c->establish_connection ();
		771	}
		772	}
		773	}
		774
		775	if (router)
		776	return router;
		777
		778	// second try find the router with the highest priority higher than ours
		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->routerprio > THISNODE->routerprio
		788	&& c != dst
		789	&& c->conf != THISNODE)
		790	{
		791	if (c->ictx && c->octx)
		792	{
		793	prio = c->conf->routerprio;
		794	router = c;
		795	}
		796	else
		797	c->establish_connection ();
		798	}
		799	}
		800	}
		801	return router;
		802	}
		803
		804	void vpn::connection_established (connection *c)
		805	{
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	806	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	807	{
421	connection c = i;	808	connection o = i;
422		809
423	if (c->conf->routerprio > prio	810	if (!o->is_direct
424	&& c->connectmode == conf_node::C_ALWAYS	811	&& o->si.valid ()
425	&& c->conf != THISNODE	812	&& c->si != o->si
426	&& c->ictx && c->octx)	813	&& c == find_router_for (o))
427	{
428	prio = c->conf->routerprio;
429	router = c;
430	}	814	{
		815	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		816	o->conf->nodename, c->conf->nodename);
		817	o->rekey ();
		818	}
431	}	819	}
432
433	return router;
434	}	820	}
435		821
436	void vpn::connect_request (int id)	822	void vpn::send_connect_request (connection *c)
437	{	823	{
438	connection *c = find_router ();	824	connection *r = find_router_for (c);
439		825
440	if (c)	826	if (r)
		827	{
		828	slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."),
		829	c->conf->nodename, r->conf->nodename);
441	c->connect_request (id);	830	r->send_connect_request (c->conf->id);
442	//else // does not work, because all others must connect to the same router	831	}
443	// // no router found, aggressively connect to all routers	832	else
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	833	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."),
445	// if ((*i)->conf->routerprio)	834	c->conf->nodename);
446	// (*i)->establish_connection ();
447	}	835	}
448		836
449	void	837	void
450	connection::dump_status ()	838	connection::dump_status ()
451	{	839	{
452	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	840	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
453	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	841	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
454	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	842	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
455	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	843	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
456	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	844	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
457	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
458	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
459	}	845	}
460		846
461	void	847	void
462	vpn::dump_status ()	848	vpn::dump_status ()
463	{	849	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	850	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		851
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	852	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	853	(*c)->dump_status ();
468		854
469	slog (L_NOTICE, _("END status dump"));	855	slog (L_NOTICE, _("END status dump"));
470	}	856	}
471		857
472	vpn::vpn (void)	858	vpn::vpn (void)
		859	{
		860	event .set<vpn, &vpn::event_cb > (this);
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	861	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	862	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
475	, tap_ev_watcher(this, &vpn::tap_ev)	863	#if ENABLE_TCP
476	, event(this, &vpn::event_cb)	864	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
477	{	865	#endif
		866	#if ENABLE_ICMP
		867	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		868	#endif
		869	#if ENABLE_DNS
		870	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		871	#endif
		872	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
478	}	873	}
479		874
480	vpn::~vpn ()	875	vpn::~vpn ()
481	{	876	{
482	}	877	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.50 by pcg, Sun Aug 10 02:49:21 2008 UTC