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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 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
…		…
80	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		84
82	if (ipv4_fd < 0)	85	if (ipv4_fd < 0)
83	return -1;	86	return -1;
84		87
85	sockinfo si (THISNODE, PROT_IPv4);	88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
86		89
87	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
88	{
89	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
90	exit (1);
91	}
92
93	#ifdef IP_MTU_DISCOVER
94	// this I really consider a linux bug. I am neither connected	91	// this I really consider a linux bug. I am neither connected
95	// nor do I fragment myself. Linux still sets DF and doesn't	92	// nor do I fragment myself. Linux still sets DF and doesn't
96	// fragment for me sometimes.	93	// fragment for me sometimes.
97	{	94	{
98	int oval = IP_PMTUDISC_DONT;	95	int oval = IP_PMTUDISC_DONT;
99	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	96	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100	}	97	}
101	#endif	98	#endif
102		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
103	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
104	}	109	}
105		110
106	udpv4_fd = -1;	111	udpv4_fd = -1;
107		112
108	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
109	{	114	{
110	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111		116
112	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
113	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
114		121
115	// standard daemon practise...	122	// standard daemon practise...
116	{	123	{
117	int oval = 1;	124	int oval = 1;
118	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119	}	126	}
120		127
121	sockinfo si (THISNODE, PROT_UDPv4);	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
122
123	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
124	{
125	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
126	exit (1);
127	}
128
129	#ifdef IP_MTU_DISCOVER
130	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
131	// 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
132	// fragment for me sometimes.	131	// fragment for me sometimes.
133	{	132	{
134	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
135	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136	}	135	}
137	#endif	136	#endif
138		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
139	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		147	}
		148
		149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
		152	if (THISNODE->protocols & PROT_ICMPv4)
		153	{
		154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		155
		156	if (icmpv4_fd < 0)
		157	return -1;
		158
		159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		160
		161	#ifdef ICMP_FILTER
		162	{
		163	icmp_filter oval;
		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);
140	}	169	}
		170	#endif
		171
		172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		173	// this I really consider a linux bug. I am neither connected
		174	// nor do I fragment myself. Linux still sets DF and doesn't
		175	// fragment for me sometimes.
		176	{
		177	int oval = IP_PMTUDISC_DONT;
		178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		179	}
		180	#endif
		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
		190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		191	}
		192	#endif
141		193
142	tcpv4_fd = -1;	194	tcpv4_fd = -1;
143		195
144	#if ENABLE_TCP	196	#if ENABLE_TCP
145	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
146	{	198	{
147	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
148		200
149	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
150	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
151		205
152	// standard daemon practise...	206	// standard daemon practise...
153	{	207	{
154	int oval = 1;	208	int oval = 1;
155	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
158	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
159		213
160	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161	{	215	{
162	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));
163	exit (1);	217	exit (EXIT_FAILURE);
164	}	218	}
165		219
166	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
167	{	221	{
168	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));
169	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 ()))
170	}	249	{
		250	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		251	exit (EXIT_FAILURE);
		252	}
171		253
172	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	254	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
173	}	255	}
174	#endif	256	#endif
175		257
176	tap = new tap_device ();	258	tap = new tap_device ();
177	if (!tap) //D this, of course, never catches	259	if (!tap) //D this, of course, never catches
178	{	260	{
179	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	261	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
180	exit (1);	262	exit (EXIT_FAILURE);
181	}	263	}
182		264
183	run_script (run_script_cb (this, &vpn::script_if_up), true);	265	run_script (run_script_cb (this, &vpn::script_if_up), true);
184		266
185	tap_ev_watcher.start (tap->fd, POLLIN);	267	tap_ev_watcher.start (tap->fd, EVENT_READ);
186		268
187	reconnect_all ();	269	reconnect_all ();
188		270
189	return 0;	271	return 0;
190	}
191
192	// send a vpn packet out to other hosts
193	bool
194	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
195	{
196	switch (si.prot)
197	{
198	case PROT_IPv4:
199	return send_ipv4_packet (pkt, si, tos);
200
201	case PROT_UDPv4:
202	return send_udpv4_packet (pkt, si, tos);
203
204	#if ENABLE_TCP
205	case PROT_TCPv4:
206	return send_tcpv4_packet (pkt, si, tos);
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	return false;
212	}
213	}	272	}
214		273
215	bool	274	bool
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		281
221	return true;	282	return true;
222	}	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
223		329
224	bool	330	bool
225	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)
226	{	332	{
		333	#if defined(SOL_IP) && defined(IP_TOS)
227	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	334	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		335	#endif
228	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 ());
229		337
230	return true;	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	}
231	}	358	}
232		359
233	void	360	void
234	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	361	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
235	{	362	{
…		…
249	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	376	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
250	else	377	else
251	{	378	{
252	connection *c = conns[src - 1];	379	connection *c = conns[src - 1];
253		380
254	if (dst == 0 && !THISNODE->routerprio)	381	if (dst == 0)
255	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	382	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
256	c->conf->nodename, (const char *)rsi);	383	c->conf->nodename, (const char *)rsi);
257	else if (dst != 0 && dst != THISNODE->id)	384	else if (dst != THISNODE->id)
258	{	385	{
259	if (THISNODE->routerprio)	386	if (THISNODE->routerprio)
260	// the tos setting gets lost here. who cares.	387	// the tos setting gets lost here. who cares.
261	conns[dst - 1]->inject_vpn_packet (pkt);	388	conns[dst - 1]->inject_vpn_packet (pkt);
262	else	389	else
…		…
269	c->recv_vpn_packet (pkt, rsi);	396	c->recv_vpn_packet (pkt, rsi);
270	}	397	}
271	}	398	}
272		399
273	void	400	void
274	vpn::udpv4_ev (io_watcher &w, short revents)	401	vpn::ipv4_ev (io_watcher &w, short revents)
275	{	402	{
276	if (revents & (POLLIN \| POLLERR))	403	if (revents & EVENT_READ)
277	{	404	{
278	vpn_packet *pkt = new vpn_packet;	405	vpn_packet *pkt = new vpn_packet;
279	struct sockaddr_in sa;	406	struct sockaddr_in sa;
280	socklen_t sa_len = sizeof (sa);	407	socklen_t sa_len = sizeof (sa);
281	int len;	408	int len;
282		409
283	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);
284		411
285	sockinfo si(sa, PROT_UDPv4);	412	sockinfo si(sa, PROT_IPv4);
286		413
287	if (len > 0)	414	if (len > 0)
288	{	415	{
289	pkt->len = len;	416	pkt->len = len;
290		417
		418	// raw sockets deliver the ipv4 header, but don't expect it on sends
		419	pkt->skip_hdr (IP_OVERHEAD);
		420
291	recv_vpn_packet (pkt, si);	421	recv_vpn_packet (pkt, si);
292	}	422	}
293	else	423	else
294	{	424	{
295	// probably ECONNRESET or somesuch	425	// probably ECONNRESET or somesuch
296	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));
297	}	427	}
298		428
299	delete pkt;	429	delete pkt;
300	}	430	}
301	else if (revents & POLLHUP)
302	{
303	// this cannot ;) happen on udp sockets
304	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
305	exit (1);
306	}
307	else	431	else
308	{	432	{
309	slog (L_ERR,	433	slog (L_ERR,
310	_("FATAL: unknown revents %08x in socket, terminating\n"),	434	_("FATAL: unknown revents %08x in socket, terminating\n"),
311	revents);	435	revents);
312	exit (1);	436	exit (EXIT_FAILURE);
313	}	437	}
314	}	438	}
315		439
		440	#if ENABLE_ICMP
316	void	441	void
317	vpn::ipv4_ev (io_watcher &w, short revents)	442	vpn::icmpv4_ev (io_watcher &w, short revents)
318	{	443	{
319	if (revents & (POLLIN \| POLLERR))	444	if (revents & EVENT_READ)
320	{	445	{
321	vpn_packet *pkt = new vpn_packet;	446	vpn_packet *pkt = new vpn_packet;
322	struct sockaddr_in sa;	447	struct sockaddr_in sa;
323	socklen_t sa_len = sizeof (sa);	448	socklen_t sa_len = sizeof (sa);
324	int len;	449	int len;
325		450
326	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);
327		452
328	sockinfo si(sa, PROT_IPv4);	453	sockinfo si(sa, PROT_ICMPv4);
329		454
330	if (len > 0)	455	if (len > 0)
331	{	456	{
332	pkt->len = len;	457	pkt->len = len;
333		458
		459	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		460
		461	if (hdr->type == ::conf.icmp_type
		462	&& hdr->code == 255)
		463	{
334	// 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
335	// this is slow, but...	465	// this is slow, but...
336	pkt->skip_hdr (IP_OVERHEAD);	466	pkt->skip_hdr (ICMP_OVERHEAD);
337		467
338	recv_vpn_packet (pkt, si);	468	recv_vpn_packet (pkt, si);
		469	}
339	}	470	}
340	else	471	else
341	{	472	{
342	// probably ECONNRESET or somesuch	473	// probably ECONNRESET or somesuch
343	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	474	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
344	}	475	}
345		476
346	delete pkt;	477	delete pkt;
347	}
348	else if (revents & POLLHUP)
349	{
350	// this cannot ;) happen on udp sockets
351	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
352	exit (1);
353	}	478	}
354	else	479	else
355	{	480	{
356	slog (L_ERR,	481	slog (L_ERR,
357	_("FATAL: unknown revents %08x in socket, terminating\n"),	482	_("FATAL: unknown revents %08x in socket, terminating\n"),
358	revents);	483	revents);
359	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);
360	}	523	}
361	}	524	}
362		525
363	void	526	void
364	vpn::tap_ev (io_watcher &w, short revents)	527	vpn::tap_ev (io_watcher &w, short revents)
365	{	528	{
366	if (revents & POLLIN)	529	if (revents & EVENT_READ)
367	{	530	{
368	/* process data */	531	/* process data */
369	tap_packet *pkt;	532	tap_packet *pkt;
370		533
371	pkt = tap->recv ();	534	pkt = tap->recv ();
372		535
		536	if (!pkt)
		537	return;
		538
		539	if (pkt->len > 14)
		540	{
373	int dst = mac2id (pkt->dst);	541	int dst = mac2id (pkt->dst);
374	int src = mac2id (pkt->src);	542	int src = mac2id (pkt->src);
375		543
376	if (src != THISNODE->id)	544	if (src != THISNODE->id)
377	{
378	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
379	exit (1);
380	}
381
382	if (dst == THISNODE->id)
383	{
384	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
385	exit (1);
386	}
387
388	if (dst > conns.size ())
389	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
390	else
391	{
392	if (dst)
393	{	545	{
394	// unicast	546	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
395	if (dst != THISNODE->id)	547	exit (EXIT_FAILURE);
396	conns[dst - 1]->inject_data_packet (pkt);
397	}	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);
398	else	558	else
399	{
400	// broadcast, first check router, then self, then english
401	connection *router = find_router ();
402
403	if (router)
404	router->inject_data_packet (pkt, true);	559	inject_data_packet (pkt, dst);
405	else
406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
407	if ((*c)->conf != THISNODE)
408	(*c)->inject_data_packet (pkt);
409	}
410	}	560	}
411		561
412	delete pkt;	562	delete pkt;
413	}
414	else if (revents & (POLLHUP \| POLLERR))
415	{
416	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
417	exit (1);
418	}	563	}
419	else	564	else
420	abort ();	565	abort ();
421	}	566	}
422		567
…		…
428	if (events & EVENT_SHUTDOWN)	573	if (events & EVENT_SHUTDOWN)
429	{	574	{
430	slog (L_INFO, _("preparing shutdown..."));	575	slog (L_INFO, _("preparing shutdown..."));
431		576
432	shutdown_all ();	577	shutdown_all ();
433
434	remove_pid (pidfilename);	578	remove_pid (conf.pidfilename);
435
436	slog (L_INFO, _("terminating"));	579	slog (L_INFO, _("terminating"));
437		580	exit (EXIT_SUCCESS);
438	exit (0);
439	}	581	}
440		582
441	if (events & EVENT_RECONNECT)	583	if (events & EVENT_RECONNECT)
442	{	584	{
443	slog (L_INFO, _("forced reconnect"));	585	slog (L_INFO, _("forced reconnect"));
…		…
445	reconnect_all ();	587	reconnect_all ();
446	}	588	}
447		589
448	events = 0;	590	events = 0;
449	}	591	}
450
451	w.at = TSTAMP_CANCEL;
452	}	592	}
453		593
454	void	594	void
455	vpn::shutdown_all ()	595	vpn::shutdown_all ()
456	{	596	{
…		…
469	connection_init ();	609	connection_init ();
470		610
471	for (configuration::node_vector::iterator i = conf.nodes.begin ();	611	for (configuration::node_vector::iterator i = conf.nodes.begin ();
472	i != conf.nodes.end (); ++i)	612	i != conf.nodes.end (); ++i)
473	{	613	{
474	connection *conn = new connection (this);	614	connection conn = new connection (this, i);
475
476	conn->conf = *i;
477	conns.push_back (conn);	615	conns.push_back (conn);
478
479	conn->establish_connection ();	616	conn->establish_connection ();
480	}	617	}
481	}	618	}
482		619
483	connection *vpn::find_router ()	620	connection *vpn::find_router ()
484	{	621	{
485	u32 prio = 0;	622	u32 prio = 1;
486	connection *router = 0;	623	connection *router = 0;
487		624
488	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	625	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489	{	626	{
490	connection c = i;	627	connection c = i;
491		628
492	if (c->conf->routerprio > prio	629	if (c->conf->routerprio > prio
493	&& c->connectmode == conf_node::C_ALWAYS	630	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
494	&& c->conf != THISNODE
495	&& c->ictx && c->octx)	631	&& c->ictx && c->octx
		632	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
496	{	633	{
497	prio = c->conf->routerprio;	634	prio = c->conf->routerprio;
498	router = c;	635	router = c;
499	}	636	}
500	}	637	}
…		…
509	if (c)	646	if (c)
510	c->send_connect_request (id);	647	c->send_connect_request (id);
511	else	648	else
512	// no router found, aggressively connect to all routers	649	// no router found, aggressively connect to all routers
513	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	650	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
514	if ((*i)->conf->routerprio)	651	if ((i)->conf->routerprio && (i)->conf != THISNODE)
515	(*i)->establish_connection ();	652	(*i)->establish_connection ();
516	}	653	}
517		654
518	void	655	void
519	connection::dump_status ()	656	connection::dump_status ()
…		…
537		674
538	slog (L_NOTICE, _("END status dump"));	675	slog (L_NOTICE, _("END status dump"));
539	}	676	}
540		677
541	vpn::vpn (void)	678	vpn::vpn (void)
542	: event(this, &vpn::event_cb)	679	: event (this, &vpn::event_cb)
543	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	680	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
544	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	681	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
545	, tap_ev_watcher (this, &vpn::tap_ev)
546	#if ENABLE_TCP	682	#if ENABLE_TCP
547	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	683	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
548	#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)
549	{	692	{
550	}	693	}
551		694
552	vpn::~vpn ()	695	vpn::~vpn ()
553	{	696	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.8 by pcg, Mon Apr 7 01:28:56 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 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.30 by pcg, Fri Mar 4 20:26:50 2005 UTC