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

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	43	#include <errno.h>
34	#include <time.h>	44	#include <time.h>
35	#include <unistd.h>	45	#include <unistd.h>
		46	#include <fcntl.h>
		47	#include <sys/socket.h>
		48
		49	#include "netcompat.h"
36		50
37	#include "pidfile.h"	51	#include "pidfile.h"
38		52
39	#include "connection.h"	53	#include "connection.h"
40	#include "util.h"	54	#include "util.h"
41	#include "vpn.h"	55	#include "vpn.h"
42		56
		57	vpn network; // THE vpn (bad design...)
		58
43	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
44		60
45	const char *vpn::script_if_up (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	setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
		141	#endif
		142
		143	return fd;
71	}	144	}
72		145
73	int	146	int
74	vpn::setup ()	147	vpn::setup ()
75	{	148	{
76	sockinfo si;	149	int success = 0;
77		150
78	si.set (THISNODE);	151	ipv4_tos = -1;
79
80	udpv4_fd = -1;	152	ipv4_fd = -1;
81		153
82	if (THISNODE->protocols & PROT_UDPv4)	154	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
83	{	155	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	156	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
85		157
86	if (udpv4_fd < 0)	158	if (ipv4_fd < 0)
87	return -1;	159	return -1;
88		160
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	161	#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	162	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	163	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	164	// fragment for me sometimes.
99	{	165	{
100	int oval = IP_PMTUDISC_DONT;	166	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	167	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		168	}
		169	#endif
		170
		171	sockinfo si (THISNODE, PROT_IPv4);
		172
		173	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		174	{
		175	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		176	return -1;
102	}	177	}
103	#endif	178
		179	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		180	++success;
		181	}
		182	else
		183	THISNODE->protocols &= ~PROT_IPv4;
		184
		185	udpv4_tos = -1;
		186	udpv4_fd = -1;
		187
		188	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		189	{
		190	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		191
		192	if (udpv4_fd < 0)
		193	return -1;
104		194
105	// standard daemon practise...	195	// standard daemon practise...
106	{	196	{
107	int oval = 1;	197	int oval = 1;
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
109	}	199	}
110		200
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	201	#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	202	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	203	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	204	// fragment for me sometimes.
132	{	205	{
133	int oval = IP_PMTUDISC_DONT;	206	int oval = IP_PMTUDISC_DONT;
		207	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		208	}
		209	#endif
		210
		211	sockinfo si (THISNODE, PROT_UDPv4);
		212
		213	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		214	{
		215	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		216	return -1;
		217	}
		218
		219	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		220	++success;
		221	}
		222	else
		223	THISNODE->protocols &= ~PROT_UDPv4;
		224
		225	icmpv4_tos = -1;
		226	icmpv4_fd = -1;
		227
		228	#if ENABLE_ICMP
		229	if (THISNODE->protocols & PROT_ICMPv4)
		230	{
		231	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
		232
		233	if (icmpv4_fd < 0)
		234	return -1;
		235
		236	#ifdef ICMP_FILTER
		237	{
		238	icmp_filter oval;
		239	oval.data = 0xffffffff;
		240	if (::conf.icmp_type < 32)
		241	oval.data &= ~(1 << ::conf.icmp_type);
		242
		243	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
		244	}
		245	#endif
		246
		247	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		248	// this I really consider a linux bug. I am neither connected
		249	// nor do I fragment myself. Linux still sets DF and doesn't
		250	// fragment for me sometimes.
		251	{
		252	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	253	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		254	}
		255	#endif
		256
		257	sockinfo si (THISNODE, PROT_ICMPv4);
		258
		259	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		260	{
		261	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		262	return -1;
135	}	263	}
		264
		265	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		266	++success;
		267	}
		268	#endif
		269
		270	tcpv4_fd = -1;
		271
		272	#if ENABLE_TCP
		273	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		274	{
		275	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
		276
		277	if (tcpv4_fd < 0)
		278	return -1;
		279
		280	// standard daemon practise...
		281	{
		282	int oval = 1;
		283	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		284	}
		285
		286	sockinfo si (THISNODE, PROT_TCPv4);
		287
		288	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		289	{
		290	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		291	return -1;
		292	}
		293
		294	if (listen (tcpv4_fd, 5))
		295	{
		296	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		297	return -1;
		298	}
		299
		300	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		301	++success;
		302	}
		303	else
		304	THISNODE->protocols &= ~PROT_TCPv4;
		305	#endif
		306
		307	dnsv4_tos = -1;
		308	dnsv4_fd = -1;
		309
		310	#if ENABLE_DNS
		311	if (THISNODE->protocols & PROT_DNSv4)
		312	{
		313	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		314
		315	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		316
		317	if (dnsv4_fd < 0)
		318	return -1;
		319
		320	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		321	// this I really consider a linux bug. I am neither connected
		322	// nor do I fragment myself. Linux still sets DF and doesn't
		323	// fragment for me sometimes.
		324	{
		325	int oval = IP_PMTUDISC_DONT;
		326	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		327	}
136	#endif	328	# endif
137		329
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	330	// standard daemon practise...
		331	{
		332	int oval = 1;
		333	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	334	}
		335
		336	sockinfo si (THISNODE->dns_hostname,
		337	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		338	PROT_DNSv4);
		339
		340	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		341	{
		342	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		343	return -1;
		344	}
		345
		346	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		347	++success;
		348	}
		349	#endif
		350
		351	/////////////////////////////////////////////////////////////////////////////
		352
		353	if (!success)
		354	{
		355	slog (L_ERR, _("no protocols enabled."));
		356	return -1;
		357	}
		358
		359	reconnect_all ();
		360
		361	/////////////////////////////////////////////////////////////////////////////
140		362
141	tap = new tap_device ();	363	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	364	if (!tap) //D this, of course, never catches
143	{	365	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	366	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
145	exit (1);	367	return -1;
146	}	368	}
147		369
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	370	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
149		371
		372	run_script_cb cb;
		373	cb.set<vpn, &vpn::script_if_init> (this);
		374
		375	if (tap->if_up () &&
		376	!run_script (cb, true))
		377	{
		378	slog (L_ERR, _("interface initialization command '%s' failed."),
		379	tap->if_up ());
		380	return -1;
		381	}
		382
		383	cb.set<vpn, &vpn::script_if_up> (this);
		384	if (!run_script (cb, true))
		385	{
		386	slog (L_ERR, _("if-up command execution failed."));
		387	return -1;
		388	}
		389
150	tap_ev_watcher.start (tap->fd, POLLIN);	390	tap_ev_watcher.start (tap->fd, EV_READ);
151
152	reconnect_all ();
153		391
154	return 0;	392	return 0;
155	}	393	}
156		394
		395	bool
		396	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		397	{
		398	set_tos (ipv4_fd, ipv4_tos, tos);
		399	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		400
		401	return true;
		402	}
		403
		404	static u16
		405	ipv4_checksum (u16 *data, unsigned int len)
		406	{
		407	// use 32 bit accumulator and fold back carry bits at the end
		408	u32 sum = 0;
		409
		410	while (len > 1)
		411	{
		412	sum += *data++;
		413	len -= 2;
		414	}
		415
		416	// odd byte left?
		417	if (len)
		418	sum += (u8 )data;
		419
		420	// add back carry bits
		421	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		422	sum += (sum >> 16); // carry
		423
		424	return ~sum;
		425	}
		426
		427	#if ENABLE_ICMP
		428	bool
		429	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		430	{
		431	pkt->unshift_hdr (4);
		432
		433	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		434	hdr->type = ::conf.icmp_type;
		435	hdr->code = 255;
		436	hdr->checksum = 0;
		437	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		438
		439	set_tos (icmpv4_fd, icmpv4_tos, tos);
		440	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		441
		442	return true;
		443	}
		444	#endif
		445
		446	bool
		447	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		448	{
		449	set_tos (udpv4_fd, udpv4_tos, tos);
		450	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		451
		452	return true;
		453	}
		454
157	void	455	void
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	456	vpn::inject_data_packet (tap_packet *pkt, int dst)
159	{	457	{
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	458	if (dst)
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	459	{
162	}	460	// unicast
163		461	if (dst != THISNODE->id)
164	void	462	conns[dst - 1]->inject_data_packet (pkt);
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	463	}
166	{	464	else
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	465	{
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	466	// broadcast, this is ugly, but due to the security policy
		467	// we have to connect to all hosts...
		468	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		469	if ((*c)->conf != THISNODE)
		470	(*c)->inject_data_packet (pkt);
		471	}
169	}	472	}
170		473
171	void	474	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	475	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	476	{
174	unsigned int src = pkt->src ();	477	unsigned int src = pkt->src ();
175	unsigned int dst = pkt->dst ();	478	unsigned int dst = pkt->dst ();
176		479
177	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	480	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
178	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	481	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
179		482
180	if (src == 0 \|\| src > conns.size ()	483	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	484	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	485	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	486	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	487	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		488	else if (dst > conns.size ())
		489	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
		490	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	491	else
186	{	492	{
187	connection *c = conns[src - 1];	493	connection *c = conns[src - 1];
188		494
189	if (dst == 0 && !THISNODE->routerprio)	495	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	496	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
191	c->conf->nodename, (const char *)rsi);	497	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	498	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	499	{
		500	if (THISNODE->routerprio)
		501	// the tos setting gets lost here. who cares.
		502	conns[dst - 1]->inject_vpn_packet (pkt);
		503	else
194	slog (L_WARN,	504	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	505	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
		506	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	507	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	508	}
198	THISNODE->id, THISNODE->nodename);
199	else	509	else
200	c->recv_vpn_packet (pkt, rsi);	510	c->recv_vpn_packet (pkt, rsi);
201	}	511	}
202	}	512	}
203		513
204	void	514	bool
205	vpn::udpv4_ev (short revents)	515	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	516	{
207	if (revents & (POLLIN \| POLLERR))	517	switch (si.prot)
		518	{
		519	case PROT_IPv4:
		520	return send_ipv4_packet (pkt, si, tos);
		521
		522	case PROT_UDPv4:
		523	return send_udpv4_packet (pkt, si, tos);
		524
		525	#if ENABLE_TCP
		526	case PROT_TCPv4:
		527	return send_tcpv4_packet (pkt, si, tos);
		528	#endif
		529	#if ENABLE_ICMP
		530	case PROT_ICMPv4:
		531	return send_icmpv4_packet (pkt, si, tos);
		532	#endif
		533	#if ENABLE_DNS
		534	case PROT_DNSv4:
		535	return send_dnsv4_packet (pkt, si, tos);
		536	#endif
		537	default:
		538	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		539	}
		540
		541	return false;
		542	}
		543
		544	inline void
		545	vpn::ipv4_ev (ev::io &w, int revents)
		546	{
		547	if (revents & EV_READ)
208	{	548	{
209	vpn_packet *pkt = new vpn_packet;	549	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	550	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	551	socklen_t sa_len = sizeof (sa);
212	int len;	552	int len;
213		553
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	554	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		555
216	sockinfo si(sa);	556	sockinfo si(sa, PROT_IPv4);
217		557
218	if (len > 0)	558	if (len > 0)
219	{	559	{
220	pkt->len = len;	560	pkt->len = len;
221		561
		562	// raw sockets deliver the ipv4 header, but don't expect it on sends
		563	pkt->skip_hdr (IP_OVERHEAD);
		564
222	recv_vpn_packet (pkt, si);	565	recv_vpn_packet (pkt, si);
223	}	566	}
224	else	567	else
225	{	568	{
226	// probably ECONNRESET or somesuch	569	// probably ECONNRESET or somesuch
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	570	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
228	}	571	}
229		572
230	delete pkt;	573	delete pkt;
231	}	574	}
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	575	else
239	{	576	{
240	slog (L_ERR,	577	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	578	_("FATAL: unknown revents %08x in socket, exiting.\n"),
242	revents);	579	revents);
243	exit (1);	580	exit (EXIT_FAILURE);
244	}	581	}
245	}	582	}
246		583
247	void	584	#if ENABLE_ICMP
248	vpn::ipv4_ev (short revents)	585	inline void
		586	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	587	{
250	if (revents & (POLLIN \| POLLERR))	588	if (revents & EV_READ)
251	{	589	{
252	vpn_packet *pkt = new vpn_packet;	590	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	591	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	592	socklen_t sa_len = sizeof (sa);
255	int len;	593	int len;
256		594
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	595	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		596
259	sockinfo si(sa, PROT_IPv4);	597	sockinfo si(sa, PROT_ICMPv4);
260		598
261	if (len > 0)	599	if (len > 0)
262	{	600	{
263	pkt->len = len;	601	pkt->len = len;
264		602
		603	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		604
		605	if (hdr->type == ::conf.icmp_type
		606	&& hdr->code == 255)
		607	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	608	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	609	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	610	pkt->skip_hdr (ICMP_OVERHEAD);
		611
		612	recv_vpn_packet (pkt, si);
		613	}
		614	}
		615	else
		616	{
		617	// probably ECONNRESET or somesuch
		618	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		619	}
		620
		621	delete pkt;
		622	}
		623	else
		624	{
		625	slog (L_ERR,
		626	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		627	revents);
		628	exit (EXIT_FAILURE);
		629	}
		630	}
		631	#endif
		632
		633	inline void
		634	vpn::udpv4_ev (ev::io &w, int revents)
		635	{
		636	if (revents & EV_READ)
		637	{
		638	vpn_packet *pkt = new vpn_packet;
		639	struct sockaddr_in sa;
		640	socklen_t sa_len = sizeof (sa);
		641	int len;
		642
		643	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		644
		645	sockinfo si(sa, PROT_UDPv4);
		646
		647	if (len > 0)
		648	{
		649	pkt->len = len;
268		650
269	recv_vpn_packet (pkt, si);	651	recv_vpn_packet (pkt, si);
270	}	652	}
271	else	653	else
272	{	654	{
273	// probably ECONNRESET or somesuch	655	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	656	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
275	}	657	}
276		658
277	delete pkt;	659	delete pkt;
278	}	660	}
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	661	else
286	{	662	{
287	slog (L_ERR,	663	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	664	_("FATAL: unknown revents %08x in socket, exiting.\n"),
289	revents);	665	revents);
290	exit (1);	666	exit (EXIT_FAILURE);
291	}	667	}
292	}	668	}
293		669
294	void	670	inline void
295	vpn::tap_ev (short revents)	671	vpn::tap_ev (ev::io &w, int revents)
296	{	672	{
297	if (revents & POLLIN)	673	if (revents & EV_READ)
298	{	674	{
299	/* process data */	675	/* process data */
300	tap_packet *pkt;	676	tap_packet *pkt;
301		677
302	pkt = tap->recv ();	678	pkt = tap->recv ();
303		679
		680	if (!pkt)
		681	return;
		682
		683	if (pkt->len > 14)
		684	{
304	int dst = mac2id (pkt->dst);	685	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	686	int src = mac2id (pkt->src);
306		687
307	if (src != THISNODE->id)	688	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	{	689	{
325	// unicast	690	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	691	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	692	}
		693
		694	if (dst == THISNODE->id)
		695	{
		696	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		697	exit (EXIT_FAILURE);
		698	}
		699
		700	if (dst > conns.size ())
		701	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	702	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);	703	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	}	704	}
342		705
343	delete pkt;	706	delete pkt;
344	}	707	}
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	708	else
351	abort ();	709	abort ();
352	}	710	}
353		711
354	void	712	inline void
355	vpn::event_cb (tstamp &ts)	713	vpn::event_cb (ev::timer &w, int)
356	{	714	{
357	if (events)	715	if (events)
358	{	716	{
359	if (events & EVENT_SHUTDOWN)	717	if (events & EVENT_SHUTDOWN)
360	{	718	{
361	slog (L_INFO, _("preparing shutdown..."));	719	slog (L_INFO, _("preparing shutdown..."));
362		720
363	shutdown_all ();	721	shutdown_all ();
364
365	remove_pid (pidfilename);	722	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	723	slog (L_INFO, _("exiting."));
368		724	exit (EXIT_SUCCESS);
369	exit (0);
370	}	725	}
371		726
372	if (events & EVENT_RECONNECT)	727	if (events & EVENT_RECONNECT)
373	{	728	{
374	slog (L_INFO, _("forced reconnect"));	729	slog (L_INFO, _("forced reconnect."));
375		730
376	reconnect_all ();	731	reconnect_all ();
377	}	732	}
378		733
379	events = 0;	734	events = 0;
380	}	735	}
381
382	ts = TSTAMP_CANCEL;
383	}	736	}
384		737
385	void	738	void
386	vpn::shutdown_all ()	739	vpn::shutdown_all ()
387	{	740	{
397		750
398	conns.clear ();	751	conns.clear ();
399		752
400	connection_init ();	753	connection_init ();
401		754
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	755	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
403	i != conf.nodes.end (); ++i)	756	conns.push_back (new connection (this, *i));
404	{
405	connection *conn = new connection (this);
406		757
407	conn->conf = *i;	758	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
408	conns.push_back (conn);
409
410	conn->establish_connection ();	759	(*c)->establish_connection ();
411	}
412	}	760	}
413		761
414	connection *vpn::find_router ()	762	bool vpn::can_direct (conf_node src, conf_node dst) const
415	{	763	{
416	u32 prio = 0;	764	return src != dst
		765	&& src->may_direct (dst)
		766	&& dst->may_direct (src)
		767	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		768	\|\| (src->protocols & dst->connectable_protocols ()));
		769	}
		770
		771	// only works for indirect and routed connections: find a router
		772	// from THISNODE to dst
		773	connection vpn::find_router_for (const connection dst)
		774	{
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 vpn::connection_established (connection *c)
		823	{
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	824	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	825	{
421	connection c = i;	826	connection o = i;
422		827
423	if (c->conf->routerprio > prio	828	if (!o->is_direct
424	&& c->connectmode == conf_node::C_ALWAYS	829	&& o->si.valid ()
425	&& c->conf != THISNODE	830	&& c->si != o->si
426	&& c->ictx && c->octx)	831	&& c == find_router_for (o))
427	{
428	prio = c->conf->routerprio;
429	router = c;
430	}	832	{
		833	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		834	o->conf->nodename, c->conf->nodename);
		835	o->rekey ();
		836	}
431	}	837	}
432
433	return router;
434	}	838	}
435		839
436	void vpn::connect_request (int id)	840	void vpn::send_connect_request (connection *c)
437	{	841	{
438	connection *c = find_router ();	842	connection *r = find_router_for (c);
439		843
440	if (c)	844	if (r)
		845	{
		846	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		847	c->conf->nodename, r->conf->nodename);
441	c->connect_request (id);	848	r->send_connect_request (c->conf->id);
442	//else // does not work, because all others must connect to the same router	849	}
443	// // no router found, aggressively connect to all routers	850	else
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	851	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
445	// if ((*i)->conf->routerprio)	852	c->conf->nodename);
446	// (*i)->establish_connection ();
447	}	853	}
448		854
449	void	855	void
450	connection::dump_status ()	856	connection::dump_status ()
451	{	857	{
452	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	858	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
453	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	859	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
454	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	860	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
455	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	861	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
456	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	862	(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	}	863	}
460		864
461	void	865	void
462	vpn::dump_status ()	866	vpn::dump_status ()
463	{	867	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	868	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		869
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	870	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	871	(*c)->dump_status ();
468		872
469	slog (L_NOTICE, _("END status dump"));	873	slog (L_NOTICE, _("END status dump"));
470	}	874	}
471		875
472	vpn::vpn (void)	876	vpn::vpn (void)
		877	{
		878	event .set<vpn, &vpn::event_cb > (this);
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	879	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	880	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
475	, tap_ev_watcher(this, &vpn::tap_ev)	881	#if ENABLE_TCP
476	, event(this, &vpn::event_cb)	882	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
477	{	883	#endif
		884	#if ENABLE_ICMP
		885	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		886	#endif
		887	#if ENABLE_DNS
		888	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		889	#endif
		890	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
478	}	891	}
479		892
480	vpn::~vpn ()	893	vpn::~vpn ()
481	{	894	{
482	}	895	}

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