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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.27 by pcg, Tue Mar 1 06:27:20 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) 2003-2004 Marc Lehmann <pcg@goof.com>
3		4
4	This program is free software; you can redistribute it and/or modify	5	This program is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	6	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	7	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	8	(at your option) any later version.
18		19
19	#include "config.h"	20	#include "config.h"
20		21
21	#include <list>	22	#include <list>
22		23
		24	#include <cstdio>
		25	#include <cstring>
23	#include <cstdlib>	26	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		27
27	#include <sys/types.h>	28	#include <sys/types.h>
28	#include <sys/socket.h>	29	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	30	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	31	#include <errno.h>
34	#include <time.h>	32	#include <time.h>
35	#include <unistd.h>	33	#include <unistd.h>
		34	#include <fcntl.h>
		35	#include <sys/socket.h>
		36
		37	#include "netcompat.h"
36		38
37	#include "pidfile.h"	39	#include "pidfile.h"
38		40
39	#include "connection.h"	41	#include "connection.h"
40	#include "util.h"	42	#include "util.h"
41	#include "vpn.h"	43	#include "vpn.h"
		44
		45	vpn network; // THE vpn (bad design...)
42		46
43	/////////////////////////////////////////////////////////////////////////////	47	/////////////////////////////////////////////////////////////////////////////
44		48
45	const char *vpn::script_if_up ()	49	const char *vpn::script_if_up ()
46	{	50	{
…		…
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		57
54	char *env;	58	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	65	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	68	THISNODE->id & 0xff);
68	putenv (env);	69	putenv (env);
69		70
…		…
71	}	72	}
72		73
73	int	74	int
74	vpn::setup ()	75	vpn::setup ()
75	{	76	{
		77	ipv4_fd = -1;
		78
		79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		80	{
		81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		82
		83	if (ipv4_fd < 0)
		84	return -1;
		85
		86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		87
		88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		89	// this I really consider a linux bug. I am neither connected
		90	// nor do I fragment myself. Linux still sets DF and doesn't
		91	// fragment for me sometimes.
		92	{
		93	int oval = IP_PMTUDISC_DONT;
		94	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		95	}
		96	#endif
		97
		98	sockinfo si (THISNODE, PROT_IPv4);
		99
		100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		101	{
		102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		103	exit (EXIT_FAILURE);
		104	}
		105
		106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		107	}
		108
76	udpv4_fd = -1;	109	udpv4_fd = -1;
77		110
78	if (THISNODE->protocols & PROT_UDPv4)	111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	112	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		114
82	if (udpv4_fd < 0)	115	if (udpv4_fd < 0)
83	return -1;	116	return -1;
		117
		118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
84		119
85	// standard daemon practise...	120	// standard daemon practise...
86	{	121	{
87	int oval = 1;	122	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	124	}
90		125
91	sockinfo si (THISNODE, PROT_UDPv4);	126	#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	127	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	128	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	129	// fragment for me sometimes.
103	{	130	{
104	int oval = IP_PMTUDISC_DONT;	131	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	132	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	133	}
107	#endif	134	#endif
108		135
		136	sockinfo si (THISNODE, PROT_UDPv4);
		137
		138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		139	{
		140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		141	exit (EXIT_FAILURE);
		142	}
		143
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
110	}	145	}
111		146
112	ipv4_fd = -1;	147	icmpv4_fd = -1;
		148
		149	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	150	if (THISNODE->protocols & PROT_ICMPv4)
114	{	151	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		153
117	if (ipv4_fd < 0)	154	if (icmpv4_fd < 0)
118	return -1;	155	return -1;
119		156
120	sockinfo si (THISNODE, PROT_IPv4);	157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
121		158
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	159	#ifdef ICMP_FILTER
123	{	160	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	161	icmp_filter oval;
125	exit (1);	162	oval.data = 0xffffffff;
		163	if (::conf.icmp_type < 32)
		164	oval.data &= ~(1 << ::conf.icmp_type);
		165
		166	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	167	}
		168	#endif
127		169
128	#ifdef IP_MTU_DISCOVER	170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	171	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	172	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	173	// fragment for me sometimes.
132	{	174	{
133	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	177	}
136	#endif	178	#endif
137		179
		180	sockinfo si (THISNODE, PROT_ICMPv4);
		181
		182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		183	{
		184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		185	exit (EXIT_FAILURE);
		186	}
		187
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
139	}	189	}
		190	#endif
		191
		192	tcpv4_fd = -1;
140		193
141	#if ENABLE_TCP	194	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	196	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		198
146	if (tcpv4_fd < 0)	199	if (tcpv4_fd < 0)
147	return -1;	200	return -1;
		201
		202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
148		203
149	// standard daemon practise...	204	// standard daemon practise...
150	{	205	{
151	int oval = 1;	206	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
155	sockinfo si (THISNODE, PROT_TCPv4);	210	sockinfo si (THISNODE, PROT_TCPv4);
156		211
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	213	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
160	exit (1);	215	exit (EXIT_FAILURE);
161	}	216	}
162		217
163	if (listen (tcpv4_fd, 5))	218	if (listen (tcpv4_fd, 5))
164	{	219	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
166	exit (1);	221	exit (EXIT_FAILURE);
		222	}
		223
		224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		225	}
		226	#endif
		227
		228	#if ENABLE_DNS
		229	if (THISNODE->protocols & PROT_DNSv4)
		230	{
		231	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		232
		233	if (dnsv4_fd < 0)
		234	return -1;
		235
		236	// standard daemon practise...
		237	{
		238	int oval = 1;
		239	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		240	}
		241
		242	sockinfo si (THISNODE, PROT_DNSv4);
		243
		244	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
167	}	245	{
		246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		247	exit (EXIT_FAILURE);
		248	}
168		249
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
170	}	251	}
171	#endif	252	#endif
172		253
173	tap = new tap_device ();	254	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	255	if (!tap) //D this, of course, never catches
175	{	256	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	258	exit (EXIT_FAILURE);
178	}	259	}
179		260
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	261	run_script (run_script_cb (this, &vpn::script_if_up), true);
181		262
182	tap_ev_watcher.start (tap->fd, POLLIN);	263	tap_ev_watcher.start (tap->fd, EVENT_READ);
183		264
184	reconnect_all ();	265	reconnect_all ();
185		266
186	return 0;	267	return 0;
187	}
188
189	// send a vpn packet out to other hosts
190	bool
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	return send_ipv4_packet (pkt, si, tos);
197
198	case PROT_UDPv4:
199	return send_udpv4_packet (pkt, si, tos);
200
201	#if ENABLE_TCP
202	case PROT_TCPv4:
203	return send_tcpv4_packet (pkt, si, tos);
204	#endif
205
206	default:
207	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
208	return false;
209	}
210	}	268	}
211		269
212	bool	270	bool
213	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	271	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
214	{	272	{
		273	#if defined(SOL_IP) && defined(IP_TOS)
215	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	274	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		275	#endif
216	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	276	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
217		277
218	return true;	278	return true;
219	}	279	}
		280
		281	static u16
		282	ipv4_checksum (u16 *data, unsigned int len)
		283	{
		284	// use 32 bit accumulator and fold back carry bits at the end
		285	u32 sum = 0;
		286
		287	while (len > 1)
		288	{
		289	sum += *data++;
		290	len -= 2;
		291	}
		292
		293	// odd byte left?
		294	if (len)
		295	sum += (u8 )data;
		296
		297	// add back carry bits
		298	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		299	sum += (sum >> 16); // carry
		300
		301	return ~sum;
		302	}
		303
		304	#if ENABLE_ICMP
		305	bool
		306	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		307	{
		308	#if defined(SOL_IP) && defined(IP_TOS)
		309	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		310	#endif
		311
		312	pkt->unshift_hdr (4);
		313
		314	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		315	hdr->type = ::conf.icmp_type;
		316	hdr->code = 255;
		317	hdr->checksum = 0;
		318	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		319
		320	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		321
		322	return true;
		323	}
		324	#endif
220		325
221	bool	326	bool
222	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	327	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
223	{	328	{
		329	#if defined(SOL_IP) && defined(IP_TOS)
224	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	330	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		331	#endif
225	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	332	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
226		333
227	return true;	334	return true;
		335	}
		336
		337	void
		338	vpn::inject_data_packet (tap_packet *pkt, int dst)
		339	{
		340	if (dst)
		341	{
		342	// unicast
		343	if (dst != THISNODE->id)
		344	conns[dst - 1]->inject_data_packet (pkt);
		345	}
		346	else
		347	{
		348	// broadcast, this is ugly, but due to the security policy
		349	// we have to connect to all hosts...
		350	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		351	if ((*c)->conf != THISNODE)
		352	(*c)->inject_data_packet (pkt, true);
		353	}
228	}	354	}
229		355
230	void	356	void
231	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	357	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
232	{	358	{
…		…
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	372	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else	373	else
248	{	374	{
249	connection *c = conns[src - 1];	375	connection *c = conns[src - 1];
250		376
251	if (dst == 0 && !THISNODE->routerprio)	377	if (dst == 0)
252	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	378	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
253	c->conf->nodename, (const char *)rsi);	379	c->conf->nodename, (const char *)rsi);
254	else if (dst != 0 && dst != THISNODE->id)	380	else if (dst != THISNODE->id)
255	{	381	{
256	if (THISNODE->routerprio)	382	if (THISNODE->routerprio)
257	// the tos setting gets lost here. who cares.	383	// the tos setting gets lost here. who cares.
258	conns[dst - 1]->inject_vpn_packet (pkt);	384	conns[dst - 1]->inject_vpn_packet (pkt);
259	else	385	else
…		…
266	c->recv_vpn_packet (pkt, rsi);	392	c->recv_vpn_packet (pkt, rsi);
267	}	393	}
268	}	394	}
269		395
270	void	396	void
271	vpn::udpv4_ev (io_watcher &w, short revents)	397	vpn::ipv4_ev (io_watcher &w, short revents)
272	{	398	{
273	if (revents & (POLLIN \| POLLERR))	399	if (revents & EVENT_READ)
274	{	400	{
275	vpn_packet *pkt = new vpn_packet;	401	vpn_packet *pkt = new vpn_packet;
276	struct sockaddr_in sa;	402	struct sockaddr_in sa;
277	socklen_t sa_len = sizeof (sa);	403	socklen_t sa_len = sizeof (sa);
278	int len;	404	int len;
279		405
280	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	406	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
281		407
282	sockinfo si(sa, PROT_UDPv4);	408	sockinfo si(sa, PROT_IPv4);
283		409
284	if (len > 0)	410	if (len > 0)
285	{	411	{
286	pkt->len = len;	412	pkt->len = len;
287		413
		414	// raw sockets deliver the ipv4, but don't expect it on sends
		415	// this is slow, but...
		416	pkt->skip_hdr (IP_OVERHEAD);
		417
288	recv_vpn_packet (pkt, si);	418	recv_vpn_packet (pkt, si);
289	}	419	}
290	else	420	else
291	{	421	{
292	// probably ECONNRESET or somesuch	422	// probably ECONNRESET or somesuch
293	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	423	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
294	}	424	}
295		425
296	delete pkt;	426	delete pkt;
297	}
298	else if (revents & POLLHUP)
299	{
300	// this cannot ;) happen on udp sockets
301	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
302	exit (1);
303	}	427	}
304	else	428	else
305	{	429	{
306	slog (L_ERR,	430	slog (L_ERR,
307	_("FATAL: unknown revents %08x in socket, terminating\n"),	431	_("FATAL: unknown revents %08x in socket, terminating\n"),
308	revents);	432	revents);
309	exit (1);	433	exit (EXIT_FAILURE);
310	}	434	}
311	}	435	}
312		436
		437	#if ENABLE_ICMP
313	void	438	void
314	vpn::ipv4_ev (io_watcher &w, short revents)	439	vpn::icmpv4_ev (io_watcher &w, short revents)
315	{	440	{
316	if (revents & (POLLIN \| POLLERR))	441	if (revents & EVENT_READ)
317	{	442	{
318	vpn_packet *pkt = new vpn_packet;	443	vpn_packet *pkt = new vpn_packet;
319	struct sockaddr_in sa;	444	struct sockaddr_in sa;
320	socklen_t sa_len = sizeof (sa);	445	socklen_t sa_len = sizeof (sa);
321	int len;	446	int len;
322		447
323	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	448	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
324		449
325	sockinfo si(sa, PROT_IPv4);	450	sockinfo si(sa, PROT_ICMPv4);
326		451
327	if (len > 0)	452	if (len > 0)
328	{	453	{
329	pkt->len = len;	454	pkt->len = len;
330		455
		456	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		457
		458	if (hdr->type == ::conf.icmp_type
		459	&& hdr->code == 255)
		460	{
331	// raw sockets deliver the ipv4, but don't expect it on sends	461	// raw sockets deliver the ipv4, but don't expect it on sends
332	// this is slow, but...	462	// this is slow, but...
333	pkt->skip_hdr (IP_OVERHEAD);	463	pkt->skip_hdr (ICMP_OVERHEAD);
334		464
335	recv_vpn_packet (pkt, si);	465	recv_vpn_packet (pkt, si);
		466	}
336	}	467	}
337	else	468	else
338	{	469	{
339	// probably ECONNRESET or somesuch	470	// probably ECONNRESET or somesuch
340	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	471	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
341	}	472	}
342		473
343	delete pkt;	474	delete pkt;
344	}
345	else if (revents & POLLHUP)
346	{
347	// this cannot ;) happen on udp sockets
348	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
349	exit (1);
350	}	475	}
351	else	476	else
352	{	477	{
353	slog (L_ERR,	478	slog (L_ERR,
354	_("FATAL: unknown revents %08x in socket, terminating\n"),	479	_("FATAL: unknown revents %08x in socket, terminating\n"),
355	revents);	480	revents);
356	exit (1);	481	exit (EXIT_FAILURE);
		482	}
		483	}
		484	#endif
		485
		486	void
		487	vpn::udpv4_ev (io_watcher &w, short revents)
		488	{
		489	if (revents & EVENT_READ)
		490	{
		491	vpn_packet *pkt = new vpn_packet;
		492	struct sockaddr_in sa;
		493	socklen_t sa_len = sizeof (sa);
		494	int len;
		495
		496	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		497
		498	sockinfo si(sa, PROT_UDPv4);
		499
		500	if (len > 0)
		501	{
		502	pkt->len = len;
		503
		504	recv_vpn_packet (pkt, si);
		505	}
		506	else
		507	{
		508	// probably ECONNRESET or somesuch
		509	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		510	}
		511
		512	delete pkt;
		513	}
		514	else
		515	{
		516	slog (L_ERR,
		517	_("FATAL: unknown revents %08x in socket, terminating\n"),
		518	revents);
		519	exit (EXIT_FAILURE);
357	}	520	}
358	}	521	}
359		522
360	void	523	void
361	vpn::tap_ev (io_watcher &w, short revents)	524	vpn::tap_ev (io_watcher &w, short revents)
362	{	525	{
363	if (revents & POLLIN)	526	if (revents & EVENT_READ)
364	{	527	{
365	/* process data */	528	/* process data */
366	tap_packet *pkt;	529	tap_packet *pkt;
367		530
368	pkt = tap->recv ();	531	pkt = tap->recv ();
369		532
		533	if (!pkt)
		534	return;
		535
		536	if (pkt->len > 14)
		537	{
370	int dst = mac2id (pkt->dst);	538	int dst = mac2id (pkt->dst);
371	int src = mac2id (pkt->src);	539	int src = mac2id (pkt->src);
372		540
373	if (src != THISNODE->id)	541	if (src != THISNODE->id)
374	{
375	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
376	exit (1);
377	}
378
379	if (dst == THISNODE->id)
380	{
381	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
382	exit (1);
383	}
384
385	if (dst > conns.size ())
386	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else
388	{
389	if (dst)
390	{	542	{
391	// unicast	543	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
392	if (dst != THISNODE->id)	544	exit (EXIT_FAILURE);
393	conns[dst - 1]->inject_data_packet (pkt);
394	}	545	}
		546
		547	if (dst == THISNODE->id)
		548	{
		549	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		550	exit (EXIT_FAILURE);
		551	}
		552
		553	if (dst > conns.size ())
		554	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
395	else	555	else
396	{
397	// broadcast, first check router, then self, then english
398	connection *router = find_router ();
399
400	if (router)
401	router->inject_data_packet (pkt, true);	556	inject_data_packet (pkt, dst);
402	else
403	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
404	if ((*c)->conf != THISNODE)
405	(*c)->inject_data_packet (pkt);
406	}
407	}	557	}
408		558
409	delete pkt;	559	delete pkt;
410	}
411	else if (revents & (POLLHUP \| POLLERR))
412	{
413	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
414	exit (1);
415	}	560	}
416	else	561	else
417	abort ();	562	abort ();
418	}	563	}
419		564
…		…
425	if (events & EVENT_SHUTDOWN)	570	if (events & EVENT_SHUTDOWN)
426	{	571	{
427	slog (L_INFO, _("preparing shutdown..."));	572	slog (L_INFO, _("preparing shutdown..."));
428		573
429	shutdown_all ();	574	shutdown_all ();
430
431	remove_pid (pidfilename);	575	remove_pid (conf.pidfilename);
432
433	slog (L_INFO, _("terminating"));	576	slog (L_INFO, _("terminating"));
434		577	exit (EXIT_SUCCESS);
435	exit (0);
436	}	578	}
437		579
438	if (events & EVENT_RECONNECT)	580	if (events & EVENT_RECONNECT)
439	{	581	{
440	slog (L_INFO, _("forced reconnect"));	582	slog (L_INFO, _("forced reconnect"));
…		…
442	reconnect_all ();	584	reconnect_all ();
443	}	585	}
444		586
445	events = 0;	587	events = 0;
446	}	588	}
447
448	w.at = TSTAMP_CANCEL;
449	}	589	}
450		590
451	void	591	void
452	vpn::shutdown_all ()	592	vpn::shutdown_all ()
453	{	593	{
…		…
466	connection_init ();	606	connection_init ();
467		607
468	for (configuration::node_vector::iterator i = conf.nodes.begin ();	608	for (configuration::node_vector::iterator i = conf.nodes.begin ();
469	i != conf.nodes.end (); ++i)	609	i != conf.nodes.end (); ++i)
470	{	610	{
471	connection *conn = new connection (this);	611	connection conn = new connection (this, i);
472
473	conn->conf = *i;
474	conns.push_back (conn);	612	conns.push_back (conn);
475
476	conn->establish_connection ();	613	conn->establish_connection ();
477	}	614	}
478	}	615	}
479		616
480	connection *vpn::find_router ()	617	connection *vpn::find_router ()
481	{	618	{
482	u32 prio = 0;	619	u32 prio = 1;
483	connection *router = 0;	620	connection *router = 0;
484		621
485	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	622	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
486	{	623	{
487	connection c = i;	624	connection c = i;
488		625
489	if (c->conf->routerprio > prio	626	if (c->conf->routerprio > prio
490	&& c->connectmode == conf_node::C_ALWAYS	627	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
491	&& c->conf != THISNODE
492	&& c->ictx && c->octx)	628	&& c->ictx && c->octx
		629	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
493	{	630	{
494	prio = c->conf->routerprio;	631	prio = c->conf->routerprio;
495	router = c;	632	router = c;
496	}	633	}
497	}	634	}
…		…
506	if (c)	643	if (c)
507	c->send_connect_request (id);	644	c->send_connect_request (id);
508	else	645	else
509	// no router found, aggressively connect to all routers	646	// no router found, aggressively connect to all routers
510	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	647	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
511	if ((*i)->conf->routerprio)	648	if ((i)->conf->routerprio && (i)->conf != THISNODE)
512	(*i)->establish_connection ();	649	(*i)->establish_connection ();
513	}	650	}
514		651
515	void	652	void
516	connection::dump_status ()	653	connection::dump_status ()
…		…
534		671
535	slog (L_NOTICE, _("END status dump"));	672	slog (L_NOTICE, _("END status dump"));
536	}	673	}
537		674
538	vpn::vpn (void)	675	vpn::vpn (void)
539	: event(this, &vpn::event_cb)	676	: event (this, &vpn::event_cb)
540	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	677	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
541	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	678	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
542	, tap_ev_watcher (this, &vpn::tap_ev)
543	#if ENABLE_TCP	679	#if ENABLE_TCP
544	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	680	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
545	#endif	681	#endif
		682	#if ENABLE_ICMP
		683	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		684	#endif
		685	#if ENABLE_DNS
		686	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		687	#endif
		688	, tap_ev_watcher (this, &vpn::tap_ev)
546	{	689	{
547	}	690	}
548		691
549	vpn::~vpn ()	692	vpn::~vpn ()
550	{	693	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs. Revision 1.27 by pcg, Tue Mar 1 06:27:20 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.27 by pcg, Tue Mar 1 06:27:20 2005 UTC