[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 1.47 by pcg, Thu Aug 7 17:54:27 2008 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	43	#include <errno.h>
34	#include <time.h>	44	#include <time.h>
35	#include <unistd.h>	45	#include <unistd.h>
		46	#include <fcntl.h>
		47	#include <sys/socket.h>
		48
		49	#include "netcompat.h"
36		50
37	#include "pidfile.h"	51	#include "pidfile.h"
38		52
39	#include "connection.h"	53	#include "connection.h"
40	#include "util.h"	54	#include "util.h"
41	#include "vpn.h"	55	#include "vpn.h"
42		56
		57	vpn network; // THE vpn (bad design...)
		58
43	/////////////////////////////////////////////////////////////////////////////	59	/////////////////////////////////////////////////////////////////////////////
44		60
45	const char *vpn::script_if_up (int)	61	static void inline
		62	set_tos (int fd, int &tos_prev, int tos)
		63	{
		64	#if defined(SOL_IP) && defined(IP_TOS)
		65	if (tos_prev == tos)
		66	return;
		67
		68	tos_prev = tos;
		69	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		70	#endif
		71	}
		72
		73	void
		74	vpn::script_init_env ()
46	{	75	{
47	// the tunnel device mtu should be the physical mtu - overhead	76	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	77	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	78	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	79	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	80	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	81	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		82
54	char *env;	83	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	84	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	85	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	86	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		87	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	88	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);	89	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	90	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);
68	putenv (env);
69		91
		92	conns [THISNODE->id - 1]->script_init_env ("");
		93
		94	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		95	{
		96	char ext[16];
		97	snprintf (ext, 16, "_%d", (*c)->conf->id);
		98	(*c)->script_init_env (ext);
		99	}
		100	}
		101
		102	inline const char *
		103	vpn::script_if_init ()
		104	{
		105	script_init_env ();
		106
		107	return tap->if_up ();
		108	}
		109
		110	inline const char *
		111	vpn::script_if_up ()
		112	{
		113	script_init_env ();
		114
		115	char *filename;
		116	asprintf (&filename,
		117	"%s/%s",
		118	confbase,
70	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	119	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		120
		121	return filename;
71	}	122	}
72		123
73	int	124	int
74	vpn::setup ()	125	vpn::setup ()
75	{	126	{
76	sockinfo si;	127	ipv4_tos = -1;
		128	ipv4_fd = -1;
77		129
78	si.set (THISNODE);	130	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		131	{
		132	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
79		133
		134	if (ipv4_fd < 0)
		135	return -1;
		136
		137	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		138	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		139
		140	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		141	// this I really consider a linux bug. I am neither connected
		142	// nor do I fragment myself. Linux still sets DF and doesn't
		143	// fragment for me sometimes.
		144	{
		145	int oval = IP_PMTUDISC_DONT;
		146	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		147	}
		148	#endif
		149
		150	sockinfo si (THISNODE, PROT_IPv4);
		151
		152	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		153	{
		154	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		155	exit (EXIT_FAILURE);
		156	}
		157
		158	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		159	}
		160
		161	udpv4_tos = -1;
80	udpv4_fd = -1;	162	udpv4_fd = -1;
81		163
82	if (THISNODE->protocols & PROT_UDPv4)	164	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
83	{	165	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	166	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
85		167
86	if (udpv4_fd < 0)	168	if (udpv4_fd < 0)
87	return -1;	169	return -1;
88		170
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	171	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		172	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
		173
		174	// standard daemon practise...
90	{	175	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));	176	int oval = 1;
92	exit (1);	177	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
93	}	178	}
94		179
95	#ifdef IP_MTU_DISCOVER	180	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	181	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	182	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	183	// fragment for me sometimes.
99	{	184	{
100	int oval = IP_PMTUDISC_DONT;	185	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	186	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
102	}	187	}
103	#endif	188	#endif
104		189
105	// standard daemon practise...	190	sockinfo si (THISNODE, PROT_UDPv4);
		191
		192	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		193	{
		194	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		195	exit (EXIT_FAILURE);
		196	}
		197
		198	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		199	}
		200
		201	icmpv4_tos = -1;
		202	icmpv4_fd = -1;
		203
		204	#if ENABLE_ICMP
		205	if (THISNODE->protocols & PROT_ICMPv4)
		206	{
		207	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		208
		209	if (icmpv4_fd < 0)
		210	return -1;
		211
		212	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		213	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		214
		215	#ifdef ICMP_FILTER
106	{	216	{
107	int oval = 1;	217	icmp_filter oval;
		218	oval.data = 0xffffffff;
		219	if (::conf.icmp_type < 32)
		220	oval.data &= ~(1 << ::conf.icmp_type);
		221
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
109	}	223	}
		224	#endif
110		225
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	226	#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	227	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	228	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	229	// fragment for me sometimes.
132	{	230	{
133	int oval = IP_PMTUDISC_DONT;	231	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	232	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	233	}
136	#endif	234	#endif
137		235
		236	sockinfo si (THISNODE, PROT_ICMPv4);
		237
		238	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		239	{
		240	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		241	exit (EXIT_FAILURE);
		242	}
		243
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	244	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		245	}
		246	#endif
		247
		248	tcpv4_fd = -1;
		249
		250	#if ENABLE_TCP
		251	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		252	{
		253	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		254
		255	if (tcpv4_fd < 0)
		256	return -1;
		257
		258	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		259	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		260
		261	// standard daemon practise...
		262	{
		263	int oval = 1;
		264	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	265	}
		266
		267	sockinfo si (THISNODE, PROT_TCPv4);
		268
		269	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		270	{
		271	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		272	exit (EXIT_FAILURE);
		273	}
		274
		275	if (listen (tcpv4_fd, 5))
		276	{
		277	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		278	exit (EXIT_FAILURE);
		279	}
		280
		281	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		282	}
		283	#endif
		284
		285	dnsv4_tos = -1;
		286	dnsv4_fd = -1;
		287
		288	#if ENABLE_DNS
		289	if (THISNODE->protocols & PROT_DNSv4)
		290	{
		291	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		292
		293	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		294
		295	if (dnsv4_fd < 0)
		296	return -1;
		297
		298	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		299	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		300
		301	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		302	// this I really consider a linux bug. I am neither connected
		303	// nor do I fragment myself. Linux still sets DF and doesn't
		304	// fragment for me sometimes.
		305	{
		306	int oval = IP_PMTUDISC_DONT;
		307	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		308	}
		309	# endif
		310
		311	// standard daemon practise...
		312	{
		313	int oval = 1;
		314	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		315	}
		316
		317	sockinfo si (THISNODE->dns_hostname,
		318	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		319	PROT_DNSv4);
		320
		321	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		322	{
		323	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		324	exit (EXIT_FAILURE);
		325	}
		326
		327	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		328	}
		329	#endif
		330
		331	/////////////////////////////////////////////////////////////////////////////
		332
		333	reconnect_all ();
		334
		335	/////////////////////////////////////////////////////////////////////////////
140		336
141	tap = new tap_device ();	337	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	338	if (!tap) //D this, of course, never catches
143	{	339	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	340	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
145	exit (1);	341	exit (EXIT_FAILURE);
146	}	342	}
147		343
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	344	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
149		345
		346	run_script_cb cb;
		347	cb.set<vpn, &vpn::script_if_init> (this);
		348
		349	if (tap->if_up () &&
		350	!run_script (cb, true))
		351	{
		352	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		353	tap->if_up ());
		354	exit (EXIT_FAILURE);
		355	}
		356
		357	cb.set<vpn, &vpn::script_if_up> (this);
		358	if (!run_script (cb, true))
		359	{
		360	slog (L_ERR, _("if-up command execution failed, exiting."));
		361	exit (EXIT_FAILURE);
		362	}
		363
150	tap_ev_watcher.start (tap->fd, POLLIN);	364	tap_ev_watcher.start (tap->fd, EV_READ);
151
152	reconnect_all ();
153		365
154	return 0;	366	return 0;
155	}	367	}
156		368
		369	bool
		370	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		371	{
		372	set_tos (ipv4_fd, ipv4_tos, tos);
		373	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		374
		375	return true;
		376	}
		377
		378	static u16
		379	ipv4_checksum (u16 *data, unsigned int len)
		380	{
		381	// use 32 bit accumulator and fold back carry bits at the end
		382	u32 sum = 0;
		383
		384	while (len > 1)
		385	{
		386	sum += *data++;
		387	len -= 2;
		388	}
		389
		390	// odd byte left?
		391	if (len)
		392	sum += (u8 )data;
		393
		394	// add back carry bits
		395	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		396	sum += (sum >> 16); // carry
		397
		398	return ~sum;
		399	}
		400
		401	#if ENABLE_ICMP
		402	bool
		403	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		404	{
		405	pkt->unshift_hdr (4);
		406
		407	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		408	hdr->type = ::conf.icmp_type;
		409	hdr->code = 255;
		410	hdr->checksum = 0;
		411	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		412
		413	set_tos (icmpv4_fd, icmpv4_tos, tos);
		414	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		415
		416	return true;
		417	}
		418	#endif
		419
		420	bool
		421	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		422	{
		423	set_tos (udpv4_fd, udpv4_tos, tos);
		424	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		425
		426	return true;
		427	}
		428
157	void	429	void
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	430	vpn::inject_data_packet (tap_packet *pkt, int dst)
159	{	431	{
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	432	if (dst)
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	433	{
162	}	434	// unicast
163		435	if (dst != THISNODE->id)
164	void	436	conns[dst - 1]->inject_data_packet (pkt);
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	437	}
166	{	438	else
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	439	{
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	440	// broadcast, this is ugly, but due to the security policy
		441	// we have to connect to all hosts...
		442	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		443	if ((*c)->conf != THISNODE)
		444	(*c)->inject_data_packet (pkt);
		445	}
169	}	446	}
170		447
171	void	448	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	449	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	450	{
180	if (src == 0 \|\| src > conns.size ()	457	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	458	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	459	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	460	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	461	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		462	else if (dst > conns.size ())
		463	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		464	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	465	else
186	{	466	{
187	connection *c = conns[src - 1];	467	connection *c = conns[src - 1];
188		468
189	if (dst == 0 && !THISNODE->routerprio)	469	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	470	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
191	c->conf->nodename, (const char *)rsi);	471	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	472	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	473	{
		474	if (THISNODE->routerprio)
		475	// the tos setting gets lost here. who cares.
		476	conns[dst - 1]->inject_vpn_packet (pkt);
		477	else
194	slog (L_WARN,	478	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	479	_("%s(%s): forwarding request (=> %s), but we are no router"),
		480	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	481	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	482	}
198	THISNODE->id, THISNODE->nodename);
199	else	483	else
200	c->recv_vpn_packet (pkt, rsi);	484	c->recv_vpn_packet (pkt, rsi);
201	}	485	}
202	}	486	}
203		487
204	void	488	bool
205	vpn::udpv4_ev (short revents)	489	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	490	{
207	if (revents & (POLLIN \| POLLERR))	491	switch (si.prot)
		492	{
		493	case PROT_IPv4:
		494	return send_ipv4_packet (pkt, si, tos);
		495
		496	case PROT_UDPv4:
		497	return send_udpv4_packet (pkt, si, tos);
		498
		499	#if ENABLE_TCP
		500	case PROT_TCPv4:
		501	return send_tcpv4_packet (pkt, si, tos);
		502	#endif
		503	#if ENABLE_ICMP
		504	case PROT_ICMPv4:
		505	return send_icmpv4_packet (pkt, si, tos);
		506	#endif
		507	#if ENABLE_DNS
		508	case PROT_DNSv4:
		509	return send_dnsv4_packet (pkt, si, tos);
		510	#endif
		511	default:
		512	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		513	}
		514
		515	return false;
		516	}
		517
		518	inline void
		519	vpn::ipv4_ev (ev::io &w, int revents)
		520	{
		521	if (revents & EV_READ)
208	{	522	{
209	vpn_packet *pkt = new vpn_packet;	523	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	524	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	525	socklen_t sa_len = sizeof (sa);
212	int len;	526	int len;
213		527
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	528	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		529
216	sockinfo si(sa);	530	sockinfo si(sa, PROT_IPv4);
217		531
218	if (len > 0)	532	if (len > 0)
219	{	533	{
220	pkt->len = len;	534	pkt->len = len;
		535
		536	// raw sockets deliver the ipv4 header, but don't expect it on sends
		537	pkt->skip_hdr (IP_OVERHEAD);
221		538
222	recv_vpn_packet (pkt, si);	539	recv_vpn_packet (pkt, si);
223	}	540	}
224	else	541	else
225	{	542	{
…		…
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	544	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
228	}	545	}
229		546
230	delete pkt;	547	delete pkt;
231	}	548	}
232	else if (revents & POLLHUP)
233	{
234	// this cannot ;) happen on udp sockets
235	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
236	exit (1);
237	}
238	else	549	else
239	{	550	{
240	slog (L_ERR,	551	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	552	_("FATAL: unknown revents %08x in socket, terminating\n"),
242	revents);	553	revents);
243	exit (1);	554	exit (EXIT_FAILURE);
244	}	555	}
245	}	556	}
246		557
247	void	558	#if ENABLE_ICMP
248	vpn::ipv4_ev (short revents)	559	inline void
		560	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	561	{
250	if (revents & (POLLIN \| POLLERR))	562	if (revents & EV_READ)
251	{	563	{
252	vpn_packet *pkt = new vpn_packet;	564	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	565	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	566	socklen_t sa_len = sizeof (sa);
255	int len;	567	int len;
256		568
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	569	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		570
259	sockinfo si(sa, PROT_IPv4);	571	sockinfo si(sa, PROT_ICMPv4);
260		572
261	if (len > 0)	573	if (len > 0)
262	{	574	{
263	pkt->len = len;	575	pkt->len = len;
264		576
		577	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		578
		579	if (hdr->type == ::conf.icmp_type
		580	&& hdr->code == 255)
		581	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	582	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	583	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	584	pkt->skip_hdr (ICMP_OVERHEAD);
268		585
269	recv_vpn_packet (pkt, si);	586	recv_vpn_packet (pkt, si);
		587	}
270	}	588	}
271	else	589	else
272	{	590	{
273	// probably ECONNRESET or somesuch	591	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	592	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
275	}	593	}
276		594
277	delete pkt;	595	delete pkt;
278	}
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	}	596	}
285	else	597	else
286	{	598	{
287	slog (L_ERR,	599	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	600	_("FATAL: unknown revents %08x in socket, terminating\n"),
289	revents);	601	revents);
290	exit (1);	602	exit (EXIT_FAILURE);
		603	}
		604	}
		605	#endif
		606
		607	inline void
		608	vpn::udpv4_ev (ev::io &w, int revents)
		609	{
		610	if (revents & EV_READ)
291	}	611	{
292	}	612	vpn_packet *pkt = new vpn_packet;
		613	struct sockaddr_in sa;
		614	socklen_t sa_len = sizeof (sa);
		615	int len;
293		616
294	void	617	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		618
		619	sockinfo si(sa, PROT_UDPv4);
		620
		621	if (len > 0)
		622	{
		623	pkt->len = len;
		624
		625	recv_vpn_packet (pkt, si);
		626	}
		627	else
		628	{
		629	// probably ECONNRESET or somesuch
		630	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		631	}
		632
		633	delete pkt;
		634	}
		635	else
		636	{
		637	slog (L_ERR,
		638	_("FATAL: unknown revents %08x in socket, terminating\n"),
		639	revents);
		640	exit (EXIT_FAILURE);
		641	}
		642	}
		643
		644	inline void
295	vpn::tap_ev (short revents)	645	vpn::tap_ev (ev::io &w, int revents)
296	{	646	{
297	if (revents & POLLIN)	647	if (revents & EV_READ)
298	{	648	{
299	/* process data */	649	/* process data */
300	tap_packet *pkt;	650	tap_packet *pkt;
301		651
302	pkt = tap->recv ();	652	pkt = tap->recv ();
303		653
		654	if (!pkt)
		655	return;
		656
		657	if (pkt->len > 14)
		658	{
304	int dst = mac2id (pkt->dst);	659	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	660	int src = mac2id (pkt->src);
306		661
307	if (src != THISNODE->id)	662	if (src != THISNODE->id)
308	{
309	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
310	exit (1);
311	}
312
313	if (dst == THISNODE->id)
314	{
315	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
316	exit (1);
317	}
318
319	if (dst > conns.size ())
320	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
321	else
322	{
323	if (dst)
324	{	663	{
325	// unicast	664	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	665	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	666	}
		667
		668	if (dst == THISNODE->id)
		669	{
		670	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		671	exit (EXIT_FAILURE);
		672	}
		673
		674	if (dst > conns.size ())
		675	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	676	else
330	{
331	// broadcast, first check router, then self, then english
332	connection *router = find_router ();
333
334	if (router)
335	router->inject_data_packet (pkt, true);	677	inject_data_packet (pkt, dst);
336	else
337	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
338	if ((*c)->conf != THISNODE)
339	(*c)->inject_data_packet (pkt);
340	}
341	}	678	}
342		679
343	delete pkt;	680	delete pkt;
344	}
345	else if (revents & (POLLHUP \| POLLERR))
346	{
347	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
348	exit (1);
349	}	681	}
350	else	682	else
351	abort ();	683	abort ();
352	}	684	}
353		685
354	void	686	inline void
355	vpn::event_cb (tstamp &ts)	687	vpn::event_cb (ev::timer &w, int)
356	{	688	{
357	if (events)	689	if (events)
358	{	690	{
359	if (events & EVENT_SHUTDOWN)	691	if (events & EVENT_SHUTDOWN)
360	{	692	{
361	slog (L_INFO, _("preparing shutdown..."));	693	slog (L_INFO, _("preparing shutdown..."));
362		694
363	shutdown_all ();	695	shutdown_all ();
364
365	remove_pid (pidfilename);	696	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	697	slog (L_INFO, _("terminating"));
368		698	exit (EXIT_SUCCESS);
369	exit (0);
370	}	699	}
371		700
372	if (events & EVENT_RECONNECT)	701	if (events & EVENT_RECONNECT)
373	{	702	{
374	slog (L_INFO, _("forced reconnect"));	703	slog (L_INFO, _("forced reconnect"));
…		…
376	reconnect_all ();	705	reconnect_all ();
377	}	706	}
378		707
379	events = 0;	708	events = 0;
380	}	709	}
381
382	ts = TSTAMP_CANCEL;
383	}	710	}
384		711
385	void	712	void
386	vpn::shutdown_all ()	713	vpn::shutdown_all ()
387	{	714	{
…		…
400	connection_init ();	727	connection_init ();
401		728
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	729	for (configuration::node_vector::iterator i = conf.nodes.begin ();
403	i != conf.nodes.end (); ++i)	730	i != conf.nodes.end (); ++i)
404	{	731	{
405	connection *conn = new connection (this);	732	connection conn = new connection (this, i);
406
407	conn->conf = *i;
408	conns.push_back (conn);	733	conns.push_back (conn);
409
410	conn->establish_connection ();	734	conn->establish_connection ();
411	}	735	}
412	}	736	}
413		737
414	connection *vpn::find_router ()	738	connection *vpn::find_router ()
415	{	739	{
416	u32 prio = 0;	740	u32 prio = 1;
417	connection *router = 0;	741	connection *router = 0;
418		742
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	743	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	744	{
421	connection c = i;	745	connection c = i;
422		746
423	if (c->conf->routerprio > prio	747	if (c->conf->routerprio > prio
424	&& c->connectmode == conf_node::C_ALWAYS	748	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
425	&& c->conf != THISNODE
426	&& c->ictx && c->octx)	749	&& c->ictx && c->octx
		750	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
427	{	751	{
428	prio = c->conf->routerprio;	752	prio = c->conf->routerprio;
429	router = c;	753	router = c;
430	}	754	}
431	}	755	}
432		756
433	return router;	757	return router;
434	}	758	}
435		759
436	void vpn::connect_request (int id)	760	void vpn::send_connect_request (int id)
437	{	761	{
438	connection *c = find_router ();	762	connection *c = find_router ();
439		763
440	if (c)	764	if (c)
441	c->connect_request (id);	765	c->send_connect_request (id);
442	//else // does not work, because all others must connect to the same router	766	else
443	// // no router found, aggressively connect to all routers	767	// no router found, aggressively connect to all routers
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	768	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
445	// if ((*i)->conf->routerprio)	769	if ((i)->conf->routerprio && (i)->conf != THISNODE)
446	// (*i)->establish_connection ();	770	(*i)->establish_connection ();
447	}	771	}
448		772
449	void	773	void
450	connection::dump_status ()	774	connection::dump_status ()
451	{	775	{
…		…
459	}	783	}
460		784
461	void	785	void
462	vpn::dump_status ()	786	vpn::dump_status ()
463	{	787	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	788	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		789
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	790	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	791	(*c)->dump_status ();
468		792
469	slog (L_NOTICE, _("END status dump"));	793	slog (L_NOTICE, _("END status dump"));
470	}	794	}
471		795
472	vpn::vpn (void)	796	vpn::vpn (void)
		797	{
		798	event .set<vpn, &vpn::event_cb > (this);
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	799	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	800	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
475	, tap_ev_watcher(this, &vpn::tap_ev)	801	#if ENABLE_TCP
476	, event(this, &vpn::event_cb)	802	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
477	{	803	#endif
		804	#if ENABLE_ICMP
		805	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		806	#endif
		807	#if ENABLE_DNS
		808	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		809	#endif
		810	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
478	}	811	}
479		812
480	vpn::~vpn ()	813	vpn::~vpn ()
481	{	814	{
482	}	815	}

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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 1.47 by pcg, Thu Aug 7 17:54:27 2008 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 1.47 by pcg, Thu Aug 7 17:54:27 2008 UTC