[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 1.63 by root, Tue Jan 17 21:38:11 2012 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008,2010,2011 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	43	#include <errno.h>
34	#include <time.h>	44	#include <time.h>
35	#include <unistd.h>	45	#include <unistd.h>
		46	#include <fcntl.h>
		47	#include <sys/socket.h>
		48
		49	#include "netcompat.h"
36		50
37	#include "pidfile.h"	51	#include "pidfile.h"
38		52
39	#include "connection.h"	53	#include "connection.h"
40	#include "util.h"	54	#include "util.h"
41	#include "vpn.h"	55	#include "vpn.h"
42		56
		57	vpn network; // THE vpn (bad design...)
		58
43	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
44		60
45	const char *vpn::script_if_up (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;
		122	}
		123
		124	int
		125	vpn::setup_socket (u8 prot, int family, int type, int proto)
		126	{
		127	int fd = socket (family, type, proto);
		128
		129	if (fd < 0)
		130	{
		131	slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
		132	return fd;
		133	}
		134
		135	fcntl (fd, F_SETFL, O_NONBLOCK);
		136	fcntl (fd, F_SETFD, FD_CLOEXEC);
		137
		138	#ifdef SO_MARK
		139	if (::conf.nfmark)
		140	if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark))
		141	slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno));
		142	#endif
		143
		144	return fd;
71	}	145	}
72		146
73	int	147	int
74	vpn::setup ()	148	vpn::setup ()
75	{	149	{
76	sockinfo si;	150	int success = 0;
77		151
78	si.set (THISNODE);	152	ipv4_tos = -1;
79
80	udpv4_fd = -1;	153	ipv4_fd = -1;
81		154
82	if (THISNODE->protocols & PROT_UDPv4)	155	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
83	{	156	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	157	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
85		158
86	if (udpv4_fd < 0)	159	if (ipv4_fd < 0)
87	return -1;	160	return -1;
88		161
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	162	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
92	exit (1);
93	}
94
95	#ifdef IP_MTU_DISCOVER
96	// this I really consider a linux bug. I am neither connected	163	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	164	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	165	// fragment for me sometimes.
99	{	166	{
100	int oval = IP_PMTUDISC_DONT;	167	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	168	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		169	}
		170	#endif
		171
		172	sockinfo si (THISNODE, PROT_IPv4);
		173
		174	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		175	{
		176	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		177	return -1;
102	}	178	}
103	#endif	179
		180	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		181	++success;
		182	}
		183	else
		184	THISNODE->protocols &= ~PROT_IPv4;
		185
		186	udpv4_tos = -1;
		187	udpv4_fd = -1;
		188
		189	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		190	{
		191	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		192
		193	if (udpv4_fd < 0)
		194	return -1;
104		195
105	// standard daemon practise...	196	// standard daemon practise...
106	{	197	{
107	int oval = 1;	198	int oval = 1;
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	199	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
109	}	200	}
110		201
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	202	#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	203	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	204	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	205	// fragment for me sometimes.
132	{	206	{
133	int oval = IP_PMTUDISC_DONT;	207	int oval = IP_PMTUDISC_DONT;
		208	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		209	}
		210	#endif
		211
		212	sockinfo si (THISNODE, PROT_UDPv4);
		213
		214	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		215	{
		216	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		217	return -1;
		218	}
		219
		220	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		221	++success;
		222	}
		223	else
		224	THISNODE->protocols &= ~PROT_UDPv4;
		225
		226	icmpv4_tos = -1;
		227	icmpv4_fd = -1;
		228
		229	#if ENABLE_ICMP
		230	if (THISNODE->protocols & PROT_ICMPv4)
		231	{
		232	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
		233
		234	if (icmpv4_fd < 0)
		235	return -1;
		236
		237	#ifdef ICMP_FILTER
		238	{
		239	icmp_filter oval;
		240	oval.data = 0xffffffff;
		241	if (::conf.icmp_type < 32)
		242	oval.data &= ~(1 << ::conf.icmp_type);
		243
		244	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
		245	}
		246	#endif
		247
		248	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		249	// this I really consider a linux bug. I am neither connected
		250	// nor do I fragment myself. Linux still sets DF and doesn't
		251	// fragment for me sometimes.
		252	{
		253	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	254	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		255	}
		256	#endif
		257
		258	sockinfo si (THISNODE, PROT_ICMPv4);
		259
		260	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		261	{
		262	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		263	return -1;
135	}	264	}
		265
		266	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		267	++success;
		268	}
		269	#endif
		270
		271	tcpv4_fd = -1;
		272
		273	#if ENABLE_TCP
		274	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		275	{
		276	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
		277
		278	if (tcpv4_fd < 0)
		279	return -1;
		280
		281	// standard daemon practise...
		282	{
		283	int oval = 1;
		284	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		285	}
		286
		287	sockinfo si (THISNODE, PROT_TCPv4);
		288
		289	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		290	{
		291	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		292	return -1;
		293	}
		294
		295	if (listen (tcpv4_fd, 5))
		296	{
		297	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		298	return -1;
		299	}
		300
		301	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		302	++success;
		303	}
		304	else
		305	THISNODE->protocols &= ~PROT_TCPv4;
		306	#endif
		307
		308	dnsv4_tos = -1;
		309	dnsv4_fd = -1;
		310
		311	#if ENABLE_DNS
		312	if (THISNODE->protocols & PROT_DNSv4)
		313	{
		314	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		315
		316	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		317
		318	if (dnsv4_fd < 0)
		319	return -1;
		320
		321	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		322	// this I really consider a linux bug. I am neither connected
		323	// nor do I fragment myself. Linux still sets DF and doesn't
		324	// fragment for me sometimes.
		325	{
		326	int oval = IP_PMTUDISC_DONT;
		327	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		328	}
136	#endif	329	# endif
137		330
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	331	// standard daemon practise...
		332	{
		333	int oval = 1;
		334	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	335	}
		336
		337	sockinfo si (THISNODE->dns_hostname,
		338	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		339	PROT_DNSv4);
		340
		341	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		342	{
		343	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		344	return -1;
		345	}
		346
		347	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		348	++success;
		349	}
		350	#endif
		351
		352	/////////////////////////////////////////////////////////////////////////////
		353
		354	if (!success)
		355	{
		356	slog (L_ERR, _("no protocols enabled."));
		357	return -1;
		358	}
		359
		360	reconnect_all ();
		361
		362	/////////////////////////////////////////////////////////////////////////////
140		363
141	tap = new tap_device ();	364	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	365	if (!tap) //D this, of course, never catches
143	{	366	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	367	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
145	exit (1);	368	return -1;
146	}	369	}
147		370
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	371	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
149		372
		373	run_script_cb cb;
		374	cb.set<vpn, &vpn::script_if_init> (this);
		375
		376	if (tap->if_up () &&
		377	!run_script (cb, true))
		378	{
		379	slog (L_ERR, _("interface initialization command '%s' failed."),
		380	tap->if_up ());
		381	return -1;
		382	}
		383
		384	cb.set<vpn, &vpn::script_if_up> (this);
		385	if (!run_script (cb, true))
		386	{
		387	slog (L_ERR, _("if-up command execution failed."));
		388	return -1;
		389	}
		390
150	tap_ev_watcher.start (tap->fd, POLLIN);	391	tap_ev_watcher.start (tap->fd, EV_READ);
151
152	reconnect_all ();
153		392
154	return 0;	393	return 0;
155	}	394	}
156		395
		396	bool
		397	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		398	{
		399	set_tos (ipv4_fd, ipv4_tos, tos);
		400	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		401
		402	return true;
		403	}
		404
		405	static u16
		406	ipv4_checksum (u16 *data, unsigned int len)
		407	{
		408	// use 32 bit accumulator and fold back carry bits at the end
		409	u32 sum = 0;
		410
		411	while (len > 1)
		412	{
		413	sum += *data++;
		414	len -= 2;
		415	}
		416
		417	// odd byte left?
		418	if (len)
		419	sum += (u8 )data;
		420
		421	// add back carry bits
		422	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		423	sum += (sum >> 16); // carry
		424
		425	return ~sum;
		426	}
		427
		428	#if ENABLE_ICMP
		429	bool
		430	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		431	{
		432	pkt->unshift_hdr (4);
		433
		434	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		435	hdr->type = ::conf.icmp_type;
		436	hdr->code = 255;
		437	hdr->checksum = 0;
		438	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		439
		440	set_tos (icmpv4_fd, icmpv4_tos, tos);
		441	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		442
		443	return true;
		444	}
		445	#endif
		446
		447	bool
		448	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		449	{
		450	set_tos (udpv4_fd, udpv4_tos, tos);
		451	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		452
		453	return true;
		454	}
		455
157	void	456	void
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	457	vpn::inject_data_packet (tap_packet *pkt, int dst)
159	{	458	{
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	459	if (dst)
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	460	{
162	}	461	// unicast
163		462	if (dst != THISNODE->id)
164	void	463	conns[dst - 1]->inject_data_packet (pkt);
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	464	}
166	{	465	else
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	466	{
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	467	// broadcast, this is ugly, but due to the security policy
		468	// we have to connect to all hosts...
		469	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		470	if ((*c)->conf != THISNODE)
		471	(*c)->inject_data_packet (pkt);
		472	}
169	}	473	}
170		474
171	void	475	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	476	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	477	{
174	unsigned int src = pkt->src ();	478	unsigned int src = pkt->src ();
175	unsigned int dst = pkt->dst ();	479	unsigned int dst = pkt->dst ();
176		480
177	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	481	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
178	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	482	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
179		483
180	if (src == 0 \|\| src > conns.size ()	484	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	485	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	486	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	487	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	488	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	489	else
186	{	490	{
187	connection *c = conns[src - 1];	491	connection *c = conns[src - 1];
188		492
189	if (dst == 0 && !THISNODE->routerprio)	493	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	494	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
191	c->conf->nodename, (const char *)rsi);	495	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	496	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	497	{
		498	if (THISNODE->routerprio)
		499	// the tos setting gets lost here. who cares.
		500	conns[dst - 1]->inject_vpn_packet (pkt);
		501	else
194	slog (L_WARN,	502	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	503	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		504	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	505	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	506	}
198	THISNODE->id, THISNODE->nodename);
199	else	507	else
200	c->recv_vpn_packet (pkt, rsi);	508	c->recv_vpn_packet (pkt, rsi);
201	}	509	}
202	}	510	}
203		511
204	void	512	bool
205	vpn::udpv4_ev (short revents)	513	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	514	{
207	if (revents & (POLLIN \| POLLERR))	515	switch (si.prot)
		516	{
		517	case PROT_IPv4:
		518	return send_ipv4_packet (pkt, si, tos);
		519
		520	case PROT_UDPv4:
		521	return send_udpv4_packet (pkt, si, tos);
		522
		523	#if ENABLE_TCP
		524	case PROT_TCPv4:
		525	return send_tcpv4_packet (pkt, si, tos);
		526	#endif
		527	#if ENABLE_ICMP
		528	case PROT_ICMPv4:
		529	return send_icmpv4_packet (pkt, si, tos);
		530	#endif
		531	#if ENABLE_DNS
		532	case PROT_DNSv4:
		533	return send_dnsv4_packet (pkt, si, tos);
		534	#endif
		535	default:
		536	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		537	}
		538
		539	return false;
		540	}
		541
		542	inline void
		543	vpn::ipv4_ev (ev::io &w, int revents)
		544	{
		545	if (revents & EV_READ)
208	{	546	{
209	vpn_packet *pkt = new vpn_packet;	547	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	548	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	549	socklen_t sa_len = sizeof (sa);
212	int len;	550	int len;
213		551
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	552	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		553
216	sockinfo si(sa);	554	sockinfo si(sa, PROT_IPv4);
217		555
218	if (len > 0)	556	if (len > 0)
219	{	557	{
220	pkt->len = len;	558	pkt->len = len;
221		559
		560	// raw sockets deliver the ipv4 header, but don't expect it on sends
		561	pkt->skip_hdr (pkt->ipv4_hdr_len ());
		562
222	recv_vpn_packet (pkt, si);	563	recv_vpn_packet (pkt, si);
223	}	564	}
224	else	565	else
225	{	566	{
226	// probably ECONNRESET or somesuch	567	// probably ECONNRESET or somesuch
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	568	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
228	}	569	}
229		570
230	delete pkt;	571	delete pkt;
231	}	572	}
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	573	else
239	{	574	{
240	slog (L_ERR,	575	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	576	_("FATAL: unknown revents %08x in socket, exiting.\n"),
242	revents);	577	revents);
243	exit (1);	578	exit (EXIT_FAILURE);
244	}	579	}
245	}	580	}
246		581
247	void	582	#if ENABLE_ICMP
248	vpn::ipv4_ev (short revents)	583	inline void
		584	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	585	{
250	if (revents & (POLLIN \| POLLERR))	586	if (revents & EV_READ)
251	{	587	{
252	vpn_packet *pkt = new vpn_packet;	588	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	589	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	590	socklen_t sa_len = sizeof (sa);
255	int len;	591	int len;
256		592
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	593	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		594
259	sockinfo si(sa, PROT_IPv4);	595	sockinfo si(sa, PROT_ICMPv4);
260		596
261	if (len > 0)	597	if (len > 0)
262	{	598	{
263	pkt->len = len;	599	pkt->len = len;
264		600
		601	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		602
		603	if (hdr->type == ::conf.icmp_type
		604	&& hdr->code == 255)
		605	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	606	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	607	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	608	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
		609
		610	recv_vpn_packet (pkt, si);
		611	}
		612	}
		613	else
		614	{
		615	// probably ECONNRESET or somesuch
		616	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		617	}
		618
		619	delete pkt;
		620	}
		621	else
		622	{
		623	slog (L_ERR,
		624	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		625	revents);
		626	exit (EXIT_FAILURE);
		627	}
		628	}
		629	#endif
		630
		631	inline void
		632	vpn::udpv4_ev (ev::io &w, int revents)
		633	{
		634	if (revents & EV_READ)
		635	{
		636	vpn_packet *pkt = new vpn_packet;
		637	struct sockaddr_in sa;
		638	socklen_t sa_len = sizeof (sa);
		639	int len;
		640
		641	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		642
		643	sockinfo si(sa, PROT_UDPv4);
		644
		645	if (len > 0)
		646	{
		647	pkt->len = len;
268		648
269	recv_vpn_packet (pkt, si);	649	recv_vpn_packet (pkt, si);
270	}	650	}
271	else	651	else
272	{	652	{
273	// probably ECONNRESET or somesuch	653	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	654	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
275	}	655	}
276		656
277	delete pkt;	657	delete pkt;
278	}	658	}
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	659	else
286	{	660	{
287	slog (L_ERR,	661	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	662	_("FATAL: unknown revents %08x in socket, exiting.\n"),
289	revents);	663	revents);
290	exit (1);	664	exit (EXIT_FAILURE);
291	}	665	}
292	}	666	}
293		667
294	void	668	inline void
295	vpn::tap_ev (short revents)	669	vpn::tap_ev (ev::io &w, int revents)
296	{	670	{
297	if (revents & POLLIN)	671	if (revents & EV_READ)
298	{	672	{
299	/* process data */	673	/* process data */
300	tap_packet *pkt;	674	tap_packet *pkt;
301		675
302	pkt = tap->recv ();	676	pkt = tap->recv ();
303		677
		678	if (!pkt)
		679	return;
		680
		681	if (pkt->len > 14)
		682	{
304	int dst = mac2id (pkt->dst);	683	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	684	int src = mac2id (pkt->src);
306		685
307	if (src != THISNODE->id)	686	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	{	687	{
325	// unicast	688	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	689	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	690	}
		691
		692	if (dst == THISNODE->id)
		693	{
		694	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		695	exit (EXIT_FAILURE);
		696	}
		697
		698	if (dst > conns.size ())
		699	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	700	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);	701	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	}	702	}
342		703
343	delete pkt;	704	delete pkt;
344	}	705	}
345	else if (revents & (POLLHUP \| POLLERR))
346	{
347	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
348	exit (1);
349	}
350	else	706	else
351	abort ();	707	abort ();
352	}	708	}
353		709
354	void	710	inline void
355	vpn::event_cb (tstamp &ts)	711	vpn::event_cb (ev::timer &w, int)
356	{	712	{
357	if (events)	713	if (events)
358	{	714	{
359	if (events & EVENT_SHUTDOWN)	715	if (events & EVENT_SHUTDOWN)
360	{	716	{
361	slog (L_INFO, _("preparing shutdown..."));	717	slog (L_INFO, _("preparing shutdown..."));
362		718
363	shutdown_all ();	719	shutdown_all ();
364
365	remove_pid (pidfilename);	720	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	721	slog (L_INFO, _("exiting."));
368		722	exit (EXIT_SUCCESS);
369	exit (0);
370	}	723	}
371		724
372	if (events & EVENT_RECONNECT)	725	if (events & EVENT_RECONNECT)
373	{	726	{
374	slog (L_INFO, _("forced reconnect"));	727	slog (L_INFO, _("forced reconnect."));
375		728
376	reconnect_all ();	729	reconnect_all ();
377	}	730	}
378		731
379	events = 0;	732	events = 0;
380	}	733	}
381
382	ts = TSTAMP_CANCEL;
383	}	734	}
384		735
385	void	736	void
386	vpn::shutdown_all ()	737	vpn::shutdown_all ()
387	{	738	{
397		748
398	conns.clear ();	749	conns.clear ();
399		750
400	connection_init ();	751	connection_init ();
401		752
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	753	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
403	i != conf.nodes.end (); ++i)	754	conns.push_back (new connection (this, *i));
404	{
405	connection *conn = new connection (this);
406		755
407	conn->conf = *i;	756	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
408	conns.push_back (conn);
409
410	conn->establish_connection ();	757	(*c)->establish_connection ();
411	}
412	}	758	}
413		759
414	connection *vpn::find_router ()	760	bool
		761	vpn::can_direct (conf_node src, conf_node dst) const
415	{	762	{
416	u32 prio = 0;	763	return src != dst
		764	&& src->may_direct (dst)
		765	&& dst->may_direct (src)
		766	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		767	\|\| (src->protocols & dst->connectable_protocols ()));
		768	}
		769
		770	// only works for indirect and routed connections: find a router
		771	// from THISNODE to dst
		772	connection *
		773	vpn::find_router_for (const connection *dst)
		774	{
417	connection *router = 0;	775	connection *router = 0;
418		776
		777	// first try to find a router with a direct connection, route there
		778	// regardless of any other considerations.
		779	{
		780	u32 prio = 1;
		781
		782	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		783	{
		784	connection c = i;
		785
		786	if (c->conf->routerprio > prio
		787	&& c->conf != THISNODE
		788	&& can_direct (c->conf, dst->conf)
		789	&& c->ictx && c->octx)
		790	{
		791	prio = c->conf->routerprio;
		792	router = c;
		793	}
		794	}
		795	}
		796
		797	if (router)
		798	return router;
		799
		800	// second try find the router with the highest priority, higher than ours
		801	{
		802	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		803
		804	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		805	{
		806	connection c = i;
		807
		808	if (c->conf->routerprio > prio
		809	&& c != dst
		810	&& c->conf != THISNODE
		811	&& c->ictx && c->octx)
		812	{
		813	prio = c->conf->routerprio;
		814	router = c;
		815	}
		816	}
		817	}
		818
		819	return router;
		820	}
		821
		822	void
		823	vpn::connection_established (connection *c)
		824	{
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	825	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	826	{
421	connection c = i;	827	connection o = i;
422		828
423	if (c->conf->routerprio > prio	829	if (!o->is_direct
424	&& c->connectmode == conf_node::C_ALWAYS	830	&& o->si.valid ()
425	&& c->conf != THISNODE	831	&& c->si != o->si
426	&& c->ictx && c->octx)	832	&& c == find_router_for (o))
427	{
428	prio = c->conf->routerprio;
429	router = c;
430	}	833	{
		834	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		835	o->conf->nodename, c->conf->nodename);
		836	o->rekey ();
		837	}
431	}	838	}
432
433	return router;
434	}	839	}
435		840
436	void vpn::connect_request (int id)	841	void
		842	vpn::send_connect_request (connection *c)
437	{	843	{
438	connection *c = find_router ();	844	connection *r = find_router_for (c);
439		845
440	if (c)	846	if (r)
		847	{
		848	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		849	c->conf->nodename, r->conf->nodename);
441	c->connect_request (id);	850	r->send_connect_request (c->conf->id);
442	//else // does not work, because all others must connect to the same router	851	}
443	// // no router found, aggressively connect to all routers	852	else
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	853	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
445	// if ((*i)->conf->routerprio)	854	c->conf->nodename);
446	// (*i)->establish_connection ();
447	}	855	}
448		856
449	void	857	void
450	connection::dump_status ()	858	connection::dump_status ()
451	{	859	{
452	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	860	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
453	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	861	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
454	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	862	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
455	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	863	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
456	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	864	(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	}	865	}
460		866
461	void	867	void
462	vpn::dump_status ()	868	vpn::dump_status ()
463	{	869	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	870	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		871
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	872	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	873	(*c)->dump_status ();
468		874
469	slog (L_NOTICE, _("END status dump"));	875	slog (L_NOTICE, _("END status dump"));
470	}	876	}
471		877
472	vpn::vpn (void)	878	vpn::vpn (void)
		879	{
		880	event .set<vpn, &vpn::event_cb > (this);
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	881	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	882	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
475	, tap_ev_watcher(this, &vpn::tap_ev)	883	#if ENABLE_TCP
476	, event(this, &vpn::event_cb)	884	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
477	{	885	#endif
		886	#if ENABLE_ICMP
		887	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		888	#endif
		889	#if ENABLE_DNS
		890	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		891	#endif
		892	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
478	}	893	}
479		894
480	vpn::~vpn ()	895	vpn::~vpn ()
481	{	896	{
482	}	897	}

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/vpn.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.63 by root, Tue Jan 17 21:38:11 2012 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 1.63 by root, Tue Jan 17 21:38:11 2012 UTC