[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 1.55 by pcg, Fri Mar 27 22:02:57 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 (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 ());
		489	else if (dst > conns.size ())
		490	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
		491	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	492	else
186	{	493	{
187	connection *c = conns[src - 1];	494	connection *c = conns[src - 1];
188		495
189	if (dst == 0 && !THISNODE->routerprio)	496	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	497	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
191	c->conf->nodename, (const char *)rsi);	498	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	499	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	500	{
		501	if (THISNODE->routerprio)
		502	// the tos setting gets lost here. who cares.
		503	conns[dst - 1]->inject_vpn_packet (pkt);
		504	else
194	slog (L_WARN,	505	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	506	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		507	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	508	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	509	}
198	THISNODE->id, THISNODE->nodename);
199	else	510	else
200	c->recv_vpn_packet (pkt, rsi);	511	c->recv_vpn_packet (pkt, rsi);
201	}	512	}
202	}	513	}
203		514
204	void	515	bool
205	vpn::udpv4_ev (short revents)	516	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	517	{
207	if (revents & (POLLIN \| POLLERR))	518	switch (si.prot)
		519	{
		520	case PROT_IPv4:
		521	return send_ipv4_packet (pkt, si, tos);
		522
		523	case PROT_UDPv4:
		524	return send_udpv4_packet (pkt, si, tos);
		525
		526	#if ENABLE_TCP
		527	case PROT_TCPv4:
		528	return send_tcpv4_packet (pkt, si, tos);
		529	#endif
		530	#if ENABLE_ICMP
		531	case PROT_ICMPv4:
		532	return send_icmpv4_packet (pkt, si, tos);
		533	#endif
		534	#if ENABLE_DNS
		535	case PROT_DNSv4:
		536	return send_dnsv4_packet (pkt, si, tos);
		537	#endif
		538	default:
		539	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		540	}
		541
		542	return false;
		543	}
		544
		545	inline void
		546	vpn::ipv4_ev (ev::io &w, int revents)
		547	{
		548	if (revents & EV_READ)
208	{	549	{
209	vpn_packet *pkt = new vpn_packet;	550	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	551	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	552	socklen_t sa_len = sizeof (sa);
212	int len;	553	int len;
213		554
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	555	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		556
216	sockinfo si(sa);	557	sockinfo si(sa, PROT_IPv4);
217		558
218	if (len > 0)	559	if (len > 0)
219	{	560	{
220	pkt->len = len;	561	pkt->len = len;
221		562
		563	// raw sockets deliver the ipv4 header, but don't expect it on sends
		564	pkt->skip_hdr (IP_OVERHEAD);
		565
222	recv_vpn_packet (pkt, si);	566	recv_vpn_packet (pkt, si);
223	}	567	}
224	else	568	else
225	{	569	{
226	// probably ECONNRESET or somesuch	570	// probably ECONNRESET or somesuch
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	571	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
228	}	572	}
229		573
230	delete pkt;	574	delete pkt;
231	}	575	}
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	576	else
239	{	577	{
240	slog (L_ERR,	578	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	579	_("FATAL: unknown revents %08x in socket, exiting.\n"),
242	revents);	580	revents);
243	exit (1);	581	exit (EXIT_FAILURE);
244	}	582	}
245	}	583	}
246		584
247	void	585	#if ENABLE_ICMP
248	vpn::ipv4_ev (short revents)	586	inline void
		587	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	588	{
250	if (revents & (POLLIN \| POLLERR))	589	if (revents & EV_READ)
251	{	590	{
252	vpn_packet *pkt = new vpn_packet;	591	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	592	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	593	socklen_t sa_len = sizeof (sa);
255	int len;	594	int len;
256		595
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	596	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		597
259	sockinfo si(sa, PROT_IPv4);	598	sockinfo si(sa, PROT_ICMPv4);
260		599
261	if (len > 0)	600	if (len > 0)
262	{	601	{
263	pkt->len = len;	602	pkt->len = len;
264		603
		604	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		605
		606	if (hdr->type == ::conf.icmp_type
		607	&& hdr->code == 255)
		608	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	609	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	610	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	611	pkt->skip_hdr (ICMP_OVERHEAD);
		612
		613	recv_vpn_packet (pkt, si);
		614	}
		615	}
		616	else
		617	{
		618	// probably ECONNRESET or somesuch
		619	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		620	}
		621
		622	delete pkt;
		623	}
		624	else
		625	{
		626	slog (L_ERR,
		627	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		628	revents);
		629	exit (EXIT_FAILURE);
		630	}
		631	}
		632	#endif
		633
		634	inline void
		635	vpn::udpv4_ev (ev::io &w, int revents)
		636	{
		637	if (revents & EV_READ)
		638	{
		639	vpn_packet *pkt = new vpn_packet;
		640	struct sockaddr_in sa;
		641	socklen_t sa_len = sizeof (sa);
		642	int len;
		643
		644	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		645
		646	sockinfo si(sa, PROT_UDPv4);
		647
		648	if (len > 0)
		649	{
		650	pkt->len = len;
268		651
269	recv_vpn_packet (pkt, si);	652	recv_vpn_packet (pkt, si);
270	}	653	}
271	else	654	else
272	{	655	{
273	// probably ECONNRESET or somesuch	656	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	657	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
275	}	658	}
276		659
277	delete pkt;	660	delete pkt;
278	}	661	}
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	662	else
286	{	663	{
287	slog (L_ERR,	664	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	665	_("FATAL: unknown revents %08x in socket, exiting.\n"),
289	revents);	666	revents);
290	exit (1);	667	exit (EXIT_FAILURE);
291	}	668	}
292	}	669	}
293		670
294	void	671	inline void
295	vpn::tap_ev (short revents)	672	vpn::tap_ev (ev::io &w, int revents)
296	{	673	{
297	if (revents & POLLIN)	674	if (revents & EV_READ)
298	{	675	{
299	/* process data */	676	/* process data */
300	tap_packet *pkt;	677	tap_packet *pkt;
301		678
302	pkt = tap->recv ();	679	pkt = tap->recv ();
303		680
		681	if (!pkt)
		682	return;
		683
		684	if (pkt->len > 14)
		685	{
304	int dst = mac2id (pkt->dst);	686	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	687	int src = mac2id (pkt->src);
306		688
307	if (src != THISNODE->id)	689	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	{	690	{
325	// unicast	691	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	692	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	693	}
		694
		695	if (dst == THISNODE->id)
		696	{
		697	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		698	exit (EXIT_FAILURE);
		699	}
		700
		701	if (dst > conns.size ())
		702	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	703	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);	704	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	}	705	}
342		706
343	delete pkt;	707	delete pkt;
344	}	708	}
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	709	else
351	abort ();	710	abort ();
352	}	711	}
353		712
354	void	713	inline void
355	vpn::event_cb (tstamp &ts)	714	vpn::event_cb (ev::timer &w, int)
356	{	715	{
357	if (events)	716	if (events)
358	{	717	{
359	if (events & EVENT_SHUTDOWN)	718	if (events & EVENT_SHUTDOWN)
360	{	719	{
361	slog (L_INFO, _("preparing shutdown..."));	720	slog (L_INFO, _("preparing shutdown..."));
362		721
363	shutdown_all ();	722	shutdown_all ();
364
365	remove_pid (pidfilename);	723	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	724	slog (L_INFO, _("exiting."));
368		725	exit (EXIT_SUCCESS);
369	exit (0);
370	}	726	}
371		727
372	if (events & EVENT_RECONNECT)	728	if (events & EVENT_RECONNECT)
373	{	729	{
374	slog (L_INFO, _("forced reconnect"));	730	slog (L_INFO, _("forced reconnect."));
375		731
376	reconnect_all ();	732	reconnect_all ();
377	}	733	}
378		734
379	events = 0;	735	events = 0;
380	}	736	}
381
382	ts = TSTAMP_CANCEL;
383	}	737	}
384		738
385	void	739	void
386	vpn::shutdown_all ()	740	vpn::shutdown_all ()
387	{	741	{
397		751
398	conns.clear ();	752	conns.clear ();
399		753
400	connection_init ();	754	connection_init ();
401		755
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	756	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
403	i != conf.nodes.end (); ++i)	757	conns.push_back (new connection (this, *i));
404	{
405	connection *conn = new connection (this);
406		758
407	conn->conf = *i;	759	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
408	conns.push_back (conn);
409
410	conn->establish_connection ();	760	(*c)->establish_connection ();
411	}
412	}	761	}
413		762
414	connection *vpn::find_router ()	763	bool vpn::can_direct (conf_node src, conf_node dst) const
415	{	764	{
416	u32 prio = 0;	765	return src != dst
		766	&& src->may_direct (dst)
		767	&& dst->may_direct (src)
		768	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		769	\|\| (src->protocols & dst->connectable_protocols ()));
		770	}
		771
		772	// only works for indirect and routed connections: find a router
		773	// from THISNODE to dst
		774	connection vpn::find_router_for (const connection dst)
		775	{
417	connection *router = 0;	776	connection *router = 0;
418		777
		778	// first try to find a router with a direct connection, route there
		779	// regardless of any other considerations.
		780	{
		781	u32 prio = 1;
		782
		783	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		784	{
		785	connection c = i;
		786
		787	if (c->conf->routerprio > prio
		788	&& c->conf != THISNODE
		789	&& can_direct (c->conf, dst->conf)
		790	&& c->ictx && c->octx)
		791	{
		792	prio = c->conf->routerprio;
		793	router = c;
		794	}
		795	}
		796	}
		797
		798	if (router)
		799	return router;
		800
		801	// second try find the router with the highest priority, higher than ours
		802	{
		803	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		804
		805	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		806	{
		807	connection c = i;
		808
		809	if (c->conf->routerprio > prio
		810	&& c != dst
		811	&& c->conf != THISNODE
		812	&& c->ictx && c->octx)
		813	{
		814	prio = c->conf->routerprio;
		815	router = c;
		816	}
		817	}
		818	}
		819
		820	return router;
		821	}
		822
		823	void 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 vpn::send_connect_request (connection *c)
437	{	842	{
438	connection *c = find_router ();	843	connection *r = find_router_for (c);
439		844
440	if (c)	845	if (r)
		846	{
		847	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		848	c->conf->nodename, r->conf->nodename);
441	c->connect_request (id);	849	r->send_connect_request (c->conf->id);
442	//else // does not work, because all others must connect to the same router	850	}
443	// // no router found, aggressively connect to all routers	851	else
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	852	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
445	// if ((*i)->conf->routerprio)	853	c->conf->nodename);
446	// (*i)->establish_connection ();
447	}	854	}
448		855
449	void	856	void
450	connection::dump_status ()	857	connection::dump_status ()
451	{	858	{
452	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	859	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
453	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	860	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
454	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	861	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
455	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	862	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
456	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	863	(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	}	864	}
460		865
461	void	866	void
462	vpn::dump_status ()	867	vpn::dump_status ()
463	{	868	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	869	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		870
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	871	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	872	(*c)->dump_status ();
468		873
469	slog (L_NOTICE, _("END status dump"));	874	slog (L_NOTICE, _("END status dump"));
470	}	875	}
471		876
472	vpn::vpn (void)	877	vpn::vpn (void)
		878	{
		879	event .set<vpn, &vpn::event_cb > (this);
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	880	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	881	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
475	, tap_ev_watcher(this, &vpn::tap_ev)	882	#if ENABLE_TCP
476	, event(this, &vpn::event_cb)	883	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
477	{	884	#endif
		885	#if ENABLE_ICMP
		886	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		887	#endif
		888	#if ENABLE_DNS
		889	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		890	#endif
		891	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
478	}	892	}
479		893
480	vpn::~vpn ()	894	vpn::~vpn ()
481	{	895	{
482	}	896	}

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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 1.55 by pcg, Fri Mar 27 22:02:57 2009 UTC

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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 1.55 by pcg, Fri Mar 27 22:02:57 2009 UTC