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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.28 by pcg, Thu Mar 3 16:54:34 2005 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2005 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
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your 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,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but 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
12	GNU General Public License for more details.	15	GNU General 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
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	33	#include <errno.h>
34	#include <time.h>	34	#include <time.h>
35	#include <unistd.h>	35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <sys/socket.h>
		38
		39	#include "netcompat.h"
36		40
37	#include "pidfile.h"	41	#include "pidfile.h"
38		42
39	#include "connection.h"	43	#include "connection.h"
40	#include "util.h"	44	#include "util.h"
41	#include "vpn.h"	45	#include "vpn.h"
		46
		47	vpn network; // THE vpn (bad design...)
42		48
43	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
44		50
45	const char *vpn::script_if_up ()	51	const char *vpn::script_if_up ()
46	{	52	{
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		59
54	char *env;	60	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
68	putenv (env);	71	putenv (env);
69		72
…		…
71	}	74	}
72		75
73	int	76	int
74	vpn::setup ()	77	vpn::setup ()
75	{	78	{
		79	ipv4_fd = -1;
		80
		81	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		82	{
		83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		84
		85	if (ipv4_fd < 0)
		86	return -1;
		87
		88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		89
		90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		91	// this I really consider a linux bug. I am neither connected
		92	// nor do I fragment myself. Linux still sets DF and doesn't
		93	// fragment for me sometimes.
		94	{
		95	int oval = IP_PMTUDISC_DONT;
		96	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		97	}
		98	#endif
		99
		100	sockinfo si (THISNODE, PROT_IPv4);
		101
		102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		103	{
		104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		105	exit (EXIT_FAILURE);
		106	}
		107
		108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		109	}
		110
76	udpv4_fd = -1;	111	udpv4_fd = -1;
77		112
78	if (THISNODE->protocols & PROT_UDPv4)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	114	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		116
82	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
83	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
84		121
85	// standard daemon practise...	122	// standard daemon practise...
86	{	123	{
87	int oval = 1;	124	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	126	}
90		127
91	sockinfo si (THISNODE, PROT_UDPv4);	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92
93	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
94	{
95	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
96	exit (1);
97	}
98
99	#ifdef IP_MTU_DISCOVER
100	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	130	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	131	// fragment for me sometimes.
103	{	132	{
104	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	135	}
107	#endif	136	#endif
108		137
		138	sockinfo si (THISNODE, PROT_UDPv4);
		139
		140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
110	}	147	}
111		148
112	ipv4_fd = -1;	149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	152	if (THISNODE->protocols & PROT_ICMPv4)
114	{	153	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		155
117	if (ipv4_fd < 0)	156	if (icmpv4_fd < 0)
118	return -1;	157	return -1;
119		158
120	sockinfo si (THISNODE, PROT_IPv4);	159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
121		160
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	161	#ifdef ICMP_FILTER
123	{	162	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	163	icmp_filter oval;
125	exit (1);	164	oval.data = 0xffffffff;
		165	if (::conf.icmp_type < 32)
		166	oval.data &= ~(1 << ::conf.icmp_type);
		167
		168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	169	}
		170	#endif
127		171
128	#ifdef IP_MTU_DISCOVER	172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	173	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	174	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	175	// fragment for me sometimes.
132	{	176	{
133	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	179	}
136	#endif	180	#endif
137		181
		182	sockinfo si (THISNODE, PROT_ICMPv4);
		183
		184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		185	{
		186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		187	exit (EXIT_FAILURE);
		188	}
		189
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
139	}	191	}
		192	#endif
		193
		194	tcpv4_fd = -1;
140		195
141	#if ENABLE_TCP	196	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	198	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		200
146	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
147	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
148		205
149	// standard daemon practise...	206	// standard daemon practise...
150	{	207	{
151	int oval = 1;	208	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
155	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
156		213
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	215	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
160	exit (1);	217	exit (EXIT_FAILURE);
161	}	218	}
162		219
163	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
164	{	221	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
166	exit (1);	223	exit (EXIT_FAILURE);
		224	}
		225
		226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		227	}
		228	#endif
		229
		230	#if ENABLE_DNS
		231	if (THISNODE->protocols & PROT_DNSv4)
		232	{
		233	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		234
		235	if (dnsv4_fd < 0)
		236	return -1;
		237
		238	// standard daemon practise...
		239	{
		240	int oval = 1;
		241	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		242	}
		243
		244	sockinfo si (THISNODE, PROT_DNSv4);
		245
		246	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
167	}	247	{
		248	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		249	exit (EXIT_FAILURE);
		250	}
168		251
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	252	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
170	}	253	}
171	#endif	254	#endif
172		255
173	tap = new tap_device ();	256	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	257	if (!tap) //D this, of course, never catches
175	{	258	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	259	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	260	exit (EXIT_FAILURE);
178	}	261	}
179		262
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	263	run_script (run_script_cb (this, &vpn::script_if_up), true);
181		264
182	tap_ev_watcher.start (tap->fd, POLLIN);	265	tap_ev_watcher.start (tap->fd, EVENT_READ);
183		266
184	reconnect_all ();	267	reconnect_all ();
185		268
186	return 0;	269	return 0;
187	}	270	}
188		271
189	// send a vpn packet out to other hosts	272	bool
190	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	send_ipv4_packet (pkt, si, tos);
197	break;
198
199	case PROT_UDPv4:
200	send_udpv4_packet (pkt, si, tos);
201	break;
202
203	#if ENABLE_TCP
204	case PROT_TCPv4:
205	send_tcpv4_packet (pkt, si, tos);
206	break;
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	abort ();
212	}
213	}
214
215	void
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	273	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	274	{
		275	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		277	#endif
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	278	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220	}
221		279
222	void	280	return true;
		281	}
		282
		283	static u16
		284	ipv4_checksum (u16 *data, unsigned int len)
		285	{
		286	// use 32 bit accumulator and fold back carry bits at the end
		287	u32 sum = 0;
		288
		289	while (len > 1)
		290	{
		291	sum += *data++;
		292	len -= 2;
		293	}
		294
		295	// odd byte left?
		296	if (len)
		297	sum += (u8 )data;
		298
		299	// add back carry bits
		300	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		301	sum += (sum >> 16); // carry
		302
		303	return ~sum;
		304	}
		305
		306	#if ENABLE_ICMP
		307	bool
		308	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		309	{
		310	#if defined(SOL_IP) && defined(IP_TOS)
		311	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		312	#endif
		313
		314	pkt->unshift_hdr (4);
		315
		316	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		317	hdr->type = ::conf.icmp_type;
		318	hdr->code = 255;
		319	hdr->checksum = 0;
		320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		321
		322	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		323
		324	return true;
		325	}
		326	#endif
		327
		328	bool
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	329	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
224	{	330	{
		331	#if defined(SOL_IP) && defined(IP_TOS)
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	332	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		333	#endif
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	334	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		335
		336	return true;
		337	}
		338
		339	void
		340	vpn::inject_data_packet (tap_packet *pkt, int dst)
		341	{
		342	if (dst)
		343	{
		344	// unicast
		345	if (dst != THISNODE->id)
		346	conns[dst - 1]->inject_data_packet (pkt);
		347	}
		348	else
		349	{
		350	// broadcast, this is ugly, but due to the security policy
		351	// we have to connect to all hosts...
		352	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		353	if ((*c)->conf != THISNODE)
		354	(*c)->inject_data_packet (pkt, true);
		355	}
227	}	356	}
228		357
229	void	358	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	359	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	360	{
…		…
238	if (src == 0 \|\| src > conns.size ()	367	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	368	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	369	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	370	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	371	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		372	else if (dst > conns.size ())
		373	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	375	else
244	{	376	{
245	connection *c = conns[src - 1];	377	connection *c = conns[src - 1];
246		378
247	if (dst == 0 && !THISNODE->routerprio)	379	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	380	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
249	c->conf->nodename, (const char *)rsi);	381	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	382	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	383	{
		384	if (THISNODE->routerprio)
		385	// the tos setting gets lost here. who cares.
		386	conns[dst - 1]->inject_vpn_packet (pkt);
		387	else
252	slog (L_WARN,	388	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	389	_("%s(%s): forwarding request (=> %s), but we are no router"),
		390	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	391	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	392	}
256	THISNODE->id, THISNODE->nodename);
257	else	393	else
258	c->recv_vpn_packet (pkt, rsi);	394	c->recv_vpn_packet (pkt, rsi);
259	}	395	}
260	}	396	}
261		397
262	void	398	void
263	vpn::udpv4_ev (io_watcher &w, short revents)	399	vpn::ipv4_ev (io_watcher &w, short revents)
264	{	400	{
265	if (revents & (POLLIN \| POLLERR))	401	if (revents & EVENT_READ)
266	{	402	{
267	vpn_packet *pkt = new vpn_packet;	403	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	404	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	405	socklen_t sa_len = sizeof (sa);
270	int len;	406	int len;
271		407
272	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	408	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
273		409
274	sockinfo si(sa, PROT_UDPv4);	410	sockinfo si(sa, PROT_IPv4);
275		411
276	if (len > 0)	412	if (len > 0)
277	{	413	{
278	pkt->len = len;	414	pkt->len = len;
279		415
		416	// raw sockets deliver the ipv4, but don't expect it on sends
		417	// this is slow, but...
		418	pkt->skip_hdr (IP_OVERHEAD);
		419
280	recv_vpn_packet (pkt, si);	420	recv_vpn_packet (pkt, si);
281	}	421	}
282	else	422	else
283	{	423	{
284	// probably ECONNRESET or somesuch	424	// probably ECONNRESET or somesuch
285	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	425	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
286	}	426	}
287		427
288	delete pkt;	428	delete pkt;
289	}
290	else if (revents & POLLHUP)
291	{
292	// this cannot ;) happen on udp sockets
293	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
294	exit (1);
295	}	429	}
296	else	430	else
297	{	431	{
298	slog (L_ERR,	432	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	433	_("FATAL: unknown revents %08x in socket, terminating\n"),
300	revents);	434	revents);
301	exit (1);	435	exit (EXIT_FAILURE);
302	}	436	}
303	}	437	}
304		438
		439	#if ENABLE_ICMP
305	void	440	void
306	vpn::ipv4_ev (io_watcher &w, short revents)	441	vpn::icmpv4_ev (io_watcher &w, short revents)
307	{	442	{
308	if (revents & (POLLIN \| POLLERR))	443	if (revents & EVENT_READ)
309	{	444	{
310	vpn_packet *pkt = new vpn_packet;	445	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	446	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	447	socklen_t sa_len = sizeof (sa);
313	int len;	448	int len;
314		449
315	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	450	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
316		451
317	sockinfo si(sa, PROT_IPv4);	452	sockinfo si(sa, PROT_ICMPv4);
318		453
319	if (len > 0)	454	if (len > 0)
320	{	455	{
321	pkt->len = len;	456	pkt->len = len;
322		457
		458	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		459
		460	if (hdr->type == ::conf.icmp_type
		461	&& hdr->code == 255)
		462	{
323	// raw sockets deliver the ipv4, but don't expect it on sends	463	// raw sockets deliver the ipv4, but don't expect it on sends
324	// this is slow, but...	464	// this is slow, but...
325	pkt->skip_hdr (IP_OVERHEAD);	465	pkt->skip_hdr (ICMP_OVERHEAD);
326		466
327	recv_vpn_packet (pkt, si);	467	recv_vpn_packet (pkt, si);
		468	}
328	}	469	}
329	else	470	else
330	{	471	{
331	// probably ECONNRESET or somesuch	472	// probably ECONNRESET or somesuch
332	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	473	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
333	}	474	}
334		475
335	delete pkt;	476	delete pkt;
336	}
337	else if (revents & POLLHUP)
338	{
339	// this cannot ;) happen on udp sockets
340	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
341	exit (1);
342	}	477	}
343	else	478	else
344	{	479	{
345	slog (L_ERR,	480	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	481	_("FATAL: unknown revents %08x in socket, terminating\n"),
347	revents);	482	revents);
348	exit (1);	483	exit (EXIT_FAILURE);
		484	}
		485	}
		486	#endif
		487
		488	void
		489	vpn::udpv4_ev (io_watcher &w, short revents)
		490	{
		491	if (revents & EVENT_READ)
		492	{
		493	vpn_packet *pkt = new vpn_packet;
		494	struct sockaddr_in sa;
		495	socklen_t sa_len = sizeof (sa);
		496	int len;
		497
		498	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		499
		500	sockinfo si(sa, PROT_UDPv4);
		501
		502	if (len > 0)
		503	{
		504	pkt->len = len;
		505
		506	recv_vpn_packet (pkt, si);
		507	}
		508	else
		509	{
		510	// probably ECONNRESET or somesuch
		511	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		512	}
		513
		514	delete pkt;
		515	}
		516	else
		517	{
		518	slog (L_ERR,
		519	_("FATAL: unknown revents %08x in socket, terminating\n"),
		520	revents);
		521	exit (EXIT_FAILURE);
349	}	522	}
350	}	523	}
351		524
352	void	525	void
353	vpn::tap_ev (io_watcher &w, short revents)	526	vpn::tap_ev (io_watcher &w, short revents)
354	{	527	{
355	if (revents & POLLIN)	528	if (revents & EVENT_READ)
356	{	529	{
357	/* process data */	530	/* process data */
358	tap_packet *pkt;	531	tap_packet *pkt;
359		532
360	pkt = tap->recv ();	533	pkt = tap->recv ();
361		534
		535	if (!pkt)
		536	return;
		537
		538	if (pkt->len > 14)
		539	{
362	int dst = mac2id (pkt->dst);	540	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	541	int src = mac2id (pkt->src);
364		542
365	if (src != THISNODE->id)	543	if (src != THISNODE->id)
366	{
367	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
368	exit (1);
369	}
370
371	if (dst == THISNODE->id)
372	{
373	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
374	exit (1);
375	}
376
377	if (dst > conns.size ())
378	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
379	else
380	{
381	if (dst)
382	{	544	{
383	// unicast	545	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
384	if (dst != THISNODE->id)	546	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	547	}
		548
		549	if (dst == THISNODE->id)
		550	{
		551	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		552	exit (EXIT_FAILURE);
		553	}
		554
		555	if (dst > conns.size ())
		556	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else	557	else
388	{
389	// broadcast, first check router, then self, then english
390	connection *router = find_router ();
391
392	if (router)
393	router->inject_data_packet (pkt, true);	558	inject_data_packet (pkt, dst);
394	else
395	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
396	if ((*c)->conf != THISNODE)
397	(*c)->inject_data_packet (pkt);
398	}
399	}	559	}
400		560
401	delete pkt;	561	delete pkt;
402	}
403	else if (revents & (POLLHUP \| POLLERR))
404	{
405	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
406	exit (1);
407	}	562	}
408	else	563	else
409	abort ();	564	abort ();
410	}	565	}
411		566
…		…
417	if (events & EVENT_SHUTDOWN)	572	if (events & EVENT_SHUTDOWN)
418	{	573	{
419	slog (L_INFO, _("preparing shutdown..."));	574	slog (L_INFO, _("preparing shutdown..."));
420		575
421	shutdown_all ();	576	shutdown_all ();
422
423	remove_pid (pidfilename);	577	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	578	slog (L_INFO, _("terminating"));
426		579	exit (EXIT_SUCCESS);
427	exit (0);
428	}	580	}
429		581
430	if (events & EVENT_RECONNECT)	582	if (events & EVENT_RECONNECT)
431	{	583	{
432	slog (L_INFO, _("forced reconnect"));	584	slog (L_INFO, _("forced reconnect"));
…		…
434	reconnect_all ();	586	reconnect_all ();
435	}	587	}
436		588
437	events = 0;	589	events = 0;
438	}	590	}
439
440	w.at = TSTAMP_CANCEL;
441	}	591	}
442		592
443	void	593	void
444	vpn::shutdown_all ()	594	vpn::shutdown_all ()
445	{	595	{
…		…
458	connection_init ();	608	connection_init ();
459		609
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	610	for (configuration::node_vector::iterator i = conf.nodes.begin ();
461	i != conf.nodes.end (); ++i)	611	i != conf.nodes.end (); ++i)
462	{	612	{
463	connection *conn = new connection (this);	613	connection conn = new connection (this, i);
464
465	conn->conf = *i;
466	conns.push_back (conn);	614	conns.push_back (conn);
467
468	conn->establish_connection ();	615	conn->establish_connection ();
469	}	616	}
470	}	617	}
471		618
472	connection *vpn::find_router ()	619	connection *vpn::find_router ()
473	{	620	{
474	u32 prio = 0;	621	u32 prio = 1;
475	connection *router = 0;	622	connection *router = 0;
476		623
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	624	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	625	{
479	connection c = i;	626	connection c = i;
480		627
481	if (c->conf->routerprio > prio	628	if (c->conf->routerprio > prio
482	&& c->connectmode == conf_node::C_ALWAYS	629	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
483	&& c->conf != THISNODE
484	&& c->ictx && c->octx)	630	&& c->ictx && c->octx
		631	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
485	{	632	{
486	prio = c->conf->routerprio;	633	prio = c->conf->routerprio;
487	router = c;	634	router = c;
488	}	635	}
489	}	636	}
490		637
491	return router;	638	return router;
492	}	639	}
493		640
494	void vpn::connect_request (int id)	641	void vpn::send_connect_request (int id)
495	{	642	{
496	connection *c = find_router ();	643	connection *c = find_router ();
497		644
498	if (c)	645	if (c)
499	c->connect_request (id);	646	c->send_connect_request (id);
500	//else // does not work, because all others must connect to the same router	647	else
501	// // no router found, aggressively connect to all routers	648	// no router found, aggressively connect to all routers
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	649	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
503	// if ((*i)->conf->routerprio)	650	if ((i)->conf->routerprio && (i)->conf != THISNODE)
504	// (*i)->establish_connection ();	651	(*i)->establish_connection ();
505	}	652	}
506		653
507	void	654	void
508	connection::dump_status ()	655	connection::dump_status ()
509	{	656	{
…		…
526		673
527	slog (L_NOTICE, _("END status dump"));	674	slog (L_NOTICE, _("END status dump"));
528	}	675	}
529		676
530	vpn::vpn (void)	677	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	678	: event (this, &vpn::event_cb)
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	679	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	680	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	681	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	682	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
537	#endif	683	#endif
		684	#if ENABLE_ICMP
		685	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		686	#endif
		687	#if ENABLE_DNS
		688	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		689	#endif
		690	, tap_ev_watcher (this, &vpn::tap_ev)
538	{	691	{
539	}	692	}
540		693
541	vpn::~vpn ()	694	vpn::~vpn ()
542	{	695	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs. Revision 1.28 by pcg, Thu Mar 3 16:54:34 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.28 by pcg, Thu Mar 3 16:54:34 2005 UTC