[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 1.30 by pcg, Fri Mar 4 20:26:50 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	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		234
		235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		236
		237	if (dnsv4_fd < 0)
		238	return -1;
		239
		240	// standard daemon practise...
		241	{
		242	int oval = 1;
		243	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		244	}
		245
		246	sockinfo si (THISNODE, PROT_DNSv4);
		247
		248	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
167	}	249	{
		250	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		251	exit (EXIT_FAILURE);
		252	}
168		253
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	254	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
170	}	255	}
171	#endif	256	#endif
172		257
173	tap = new tap_device ();	258	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	259	if (!tap) //D this, of course, never catches
175	{	260	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	261	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	262	exit (EXIT_FAILURE);
178	}	263	}
179		264
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	265	run_script (run_script_cb (this, &vpn::script_if_up), true);
181		266
182	tap_ev_watcher.start (tap->fd, POLLIN);	267	tap_ev_watcher.start (tap->fd, EVENT_READ);
183		268
184	reconnect_all ();	269	reconnect_all ();
185		270
186	return 0;	271	return 0;
187	}	272	}
188		273
189	// send a vpn packet out to other hosts	274	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)	275	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	276	{
		277	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	278	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		279	#endif
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	280	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220	}
221		281
222	void	282	return true;
		283	}
		284
		285	static u16
		286	ipv4_checksum (u16 *data, unsigned int len)
		287	{
		288	// use 32 bit accumulator and fold back carry bits at the end
		289	u32 sum = 0;
		290
		291	while (len > 1)
		292	{
		293	sum += *data++;
		294	len -= 2;
		295	}
		296
		297	// odd byte left?
		298	if (len)
		299	sum += (u8 )data;
		300
		301	// add back carry bits
		302	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		303	sum += (sum >> 16); // carry
		304
		305	return ~sum;
		306	}
		307
		308	#if ENABLE_ICMP
		309	bool
		310	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		311	{
		312	#if defined(SOL_IP) && defined(IP_TOS)
		313	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		314	#endif
		315
		316	pkt->unshift_hdr (4);
		317
		318	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		319	hdr->type = ::conf.icmp_type;
		320	hdr->code = 255;
		321	hdr->checksum = 0;
		322	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		323
		324	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		325
		326	return true;
		327	}
		328	#endif
		329
		330	bool
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	331	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
224	{	332	{
		333	#if defined(SOL_IP) && defined(IP_TOS)
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	334	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		335	#endif
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	336	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		337
		338	return true;
		339	}
		340
		341	void
		342	vpn::inject_data_packet (tap_packet *pkt, int dst)
		343	{
		344	if (dst)
		345	{
		346	// unicast
		347	if (dst != THISNODE->id)
		348	conns[dst - 1]->inject_data_packet (pkt);
		349	}
		350	else
		351	{
		352	// broadcast, this is ugly, but due to the security policy
		353	// we have to connect to all hosts...
		354	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		355	if ((*c)->conf != THISNODE)
		356	(*c)->inject_data_packet (pkt, true);
		357	}
227	}	358	}
228		359
229	void	360	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	361	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	362	{
…		…
238	if (src == 0 \|\| src > conns.size ()	369	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	370	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	371	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	372	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	373	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		374	else if (dst > conns.size ())
		375	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		376	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	377	else
244	{	378	{
245	connection *c = conns[src - 1];	379	connection *c = conns[src - 1];
246		380
247	if (dst == 0 && !THISNODE->routerprio)	381	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	382	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
249	c->conf->nodename, (const char *)rsi);	383	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	384	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	385	{
		386	if (THISNODE->routerprio)
		387	// the tos setting gets lost here. who cares.
		388	conns[dst - 1]->inject_vpn_packet (pkt);
		389	else
252	slog (L_WARN,	390	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	391	_("%s(%s): forwarding request (=> %s), but we are no router"),
		392	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	393	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	394	}
256	THISNODE->id, THISNODE->nodename);
257	else	395	else
258	c->recv_vpn_packet (pkt, rsi);	396	c->recv_vpn_packet (pkt, rsi);
259	}	397	}
260	}	398	}
261		399
262	void	400	void
263	vpn::udpv4_ev (io_watcher &w, short revents)	401	vpn::ipv4_ev (io_watcher &w, short revents)
264	{	402	{
265	if (revents & (POLLIN \| POLLERR))	403	if (revents & EVENT_READ)
266	{	404	{
267	vpn_packet *pkt = new vpn_packet;	405	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	406	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	407	socklen_t sa_len = sizeof (sa);
270	int len;	408	int len;
271		409
272	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	410	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
273		411
274	sockinfo si(sa, PROT_UDPv4);	412	sockinfo si(sa, PROT_IPv4);
275		413
276	if (len > 0)	414	if (len > 0)
277	{	415	{
278	pkt->len = len;	416	pkt->len = len;
279		417
		418	// raw sockets deliver the ipv4 header, but don't expect it on sends
		419	pkt->skip_hdr (IP_OVERHEAD);
		420
280	recv_vpn_packet (pkt, si);	421	recv_vpn_packet (pkt, si);
281	}	422	}
282	else	423	else
283	{	424	{
284	// probably ECONNRESET or somesuch	425	// probably ECONNRESET or somesuch
285	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	426	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
286	}	427	}
287		428
288	delete pkt;	429	delete pkt;
289	}	430	}
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	}
296	else	431	else
297	{	432	{
298	slog (L_ERR,	433	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	434	_("FATAL: unknown revents %08x in socket, terminating\n"),
300	revents);	435	revents);
301	exit (1);	436	exit (EXIT_FAILURE);
302	}	437	}
303	}	438	}
304		439
		440	#if ENABLE_ICMP
305	void	441	void
306	vpn::ipv4_ev (io_watcher &w, short revents)	442	vpn::icmpv4_ev (io_watcher &w, short revents)
307	{	443	{
308	if (revents & (POLLIN \| POLLERR))	444	if (revents & EVENT_READ)
309	{	445	{
310	vpn_packet *pkt = new vpn_packet;	446	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	447	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	448	socklen_t sa_len = sizeof (sa);
313	int len;	449	int len;
314		450
315	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	451	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
316		452
317	sockinfo si(sa, PROT_IPv4);	453	sockinfo si(sa, PROT_ICMPv4);
318		454
319	if (len > 0)	455	if (len > 0)
320	{	456	{
321	pkt->len = len;	457	pkt->len = len;
322		458
		459	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		460
		461	if (hdr->type == ::conf.icmp_type
		462	&& hdr->code == 255)
		463	{
323	// raw sockets deliver the ipv4, but don't expect it on sends	464	// raw sockets deliver the ipv4, but don't expect it on sends
324	// this is slow, but...	465	// this is slow, but...
325	pkt->skip_hdr (IP_OVERHEAD);	466	pkt->skip_hdr (ICMP_OVERHEAD);
326		467
327	recv_vpn_packet (pkt, si);	468	recv_vpn_packet (pkt, si);
		469	}
328	}	470	}
329	else	471	else
330	{	472	{
331	// probably ECONNRESET or somesuch	473	// probably ECONNRESET or somesuch
332	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	474	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
333	}	475	}
334		476
335	delete pkt;	477	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	}	478	}
343	else	479	else
344	{	480	{
345	slog (L_ERR,	481	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	482	_("FATAL: unknown revents %08x in socket, terminating\n"),
347	revents);	483	revents);
348	exit (1);	484	exit (EXIT_FAILURE);
		485	}
		486	}
		487	#endif
		488
		489	void
		490	vpn::udpv4_ev (io_watcher &w, short revents)
		491	{
		492	if (revents & EVENT_READ)
		493	{
		494	vpn_packet *pkt = new vpn_packet;
		495	struct sockaddr_in sa;
		496	socklen_t sa_len = sizeof (sa);
		497	int len;
		498
		499	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		500
		501	sockinfo si(sa, PROT_UDPv4);
		502
		503	if (len > 0)
		504	{
		505	pkt->len = len;
		506
		507	recv_vpn_packet (pkt, si);
		508	}
		509	else
		510	{
		511	// probably ECONNRESET or somesuch
		512	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		513	}
		514
		515	delete pkt;
		516	}
		517	else
		518	{
		519	slog (L_ERR,
		520	_("FATAL: unknown revents %08x in socket, terminating\n"),
		521	revents);
		522	exit (EXIT_FAILURE);
349	}	523	}
350	}	524	}
351		525
352	void	526	void
353	vpn::tap_ev (io_watcher &w, short revents)	527	vpn::tap_ev (io_watcher &w, short revents)
354	{	528	{
355	if (revents & POLLIN)	529	if (revents & EVENT_READ)
356	{	530	{
357	/* process data */	531	/* process data */
358	tap_packet *pkt;	532	tap_packet *pkt;
359		533
360	pkt = tap->recv ();	534	pkt = tap->recv ();
361		535
		536	if (!pkt)
		537	return;
		538
		539	if (pkt->len > 14)
		540	{
362	int dst = mac2id (pkt->dst);	541	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	542	int src = mac2id (pkt->src);
364		543
365	if (src != THISNODE->id)	544	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	{	545	{
383	// unicast	546	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
384	if (dst != THISNODE->id)	547	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	548	}
		549
		550	if (dst == THISNODE->id)
		551	{
		552	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		553	exit (EXIT_FAILURE);
		554	}
		555
		556	if (dst > conns.size ())
		557	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else	558	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);	559	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	}	560	}
400		561
401	delete pkt;	562	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	}	563	}
408	else	564	else
409	abort ();	565	abort ();
410	}	566	}
411		567
…		…
417	if (events & EVENT_SHUTDOWN)	573	if (events & EVENT_SHUTDOWN)
418	{	574	{
419	slog (L_INFO, _("preparing shutdown..."));	575	slog (L_INFO, _("preparing shutdown..."));
420		576
421	shutdown_all ();	577	shutdown_all ();
422
423	remove_pid (pidfilename);	578	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	579	slog (L_INFO, _("terminating"));
426		580	exit (EXIT_SUCCESS);
427	exit (0);
428	}	581	}
429		582
430	if (events & EVENT_RECONNECT)	583	if (events & EVENT_RECONNECT)
431	{	584	{
432	slog (L_INFO, _("forced reconnect"));	585	slog (L_INFO, _("forced reconnect"));
…		…
434	reconnect_all ();	587	reconnect_all ();
435	}	588	}
436		589
437	events = 0;	590	events = 0;
438	}	591	}
439
440	w.at = TSTAMP_CANCEL;
441	}	592	}
442		593
443	void	594	void
444	vpn::shutdown_all ()	595	vpn::shutdown_all ()
445	{	596	{
…		…
458	connection_init ();	609	connection_init ();
459		610
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	611	for (configuration::node_vector::iterator i = conf.nodes.begin ();
461	i != conf.nodes.end (); ++i)	612	i != conf.nodes.end (); ++i)
462	{	613	{
463	connection *conn = new connection (this);	614	connection conn = new connection (this, i);
464
465	conn->conf = *i;
466	conns.push_back (conn);	615	conns.push_back (conn);
467
468	conn->establish_connection ();	616	conn->establish_connection ();
469	}	617	}
470	}	618	}
471		619
472	connection *vpn::find_router ()	620	connection *vpn::find_router ()
473	{	621	{
474	u32 prio = 0;	622	u32 prio = 1;
475	connection *router = 0;	623	connection *router = 0;
476		624
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	625	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	626	{
479	connection c = i;	627	connection c = i;
480		628
481	if (c->conf->routerprio > prio	629	if (c->conf->routerprio > prio
482	&& c->connectmode == conf_node::C_ALWAYS	630	&& 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)	631	&& c->ictx && c->octx
		632	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
485	{	633	{
486	prio = c->conf->routerprio;	634	prio = c->conf->routerprio;
487	router = c;	635	router = c;
488	}	636	}
489	}	637	}
490		638
491	return router;	639	return router;
492	}	640	}
493		641
494	void vpn::connect_request (int id)	642	void vpn::send_connect_request (int id)
495	{	643	{
496	connection *c = find_router ();	644	connection *c = find_router ();
497		645
498	if (c)	646	if (c)
499	c->connect_request (id);	647	c->send_connect_request (id);
500	//else // does not work, because all others must connect to the same router	648	else
501	// // no router found, aggressively connect to all routers	649	// no router found, aggressively connect to all routers
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	650	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
503	// if ((*i)->conf->routerprio)	651	if ((i)->conf->routerprio && (i)->conf != THISNODE)
504	// (*i)->establish_connection ();	652	(*i)->establish_connection ();
505	}	653	}
506		654
507	void	655	void
508	connection::dump_status ()	656	connection::dump_status ()
509	{	657	{
…		…
526		674
527	slog (L_NOTICE, _("END status dump"));	675	slog (L_NOTICE, _("END status dump"));
528	}	676	}
529		677
530	vpn::vpn (void)	678	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	679	: event (this, &vpn::event_cb)
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	680	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	681	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	682	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	683	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
537	#endif	684	#endif
		685	#if ENABLE_ICMP
		686	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		687	#endif
		688	#if ENABLE_DNS
		689	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		690	#endif
		691	, tap_ev_watcher (this, &vpn::tap_ev)
538	{	692	{
539	}	693	}
540		694
541	vpn::~vpn ()	695	vpn::~vpn ()
542	{	696	{

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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 1.30 by pcg, Fri Mar 4 20:26:50 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 1.30 by pcg, Fri Mar 4 20:26:50 2005 UTC