[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 1.27 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
…		…
80	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		82
82	if (ipv4_fd < 0)	83	if (ipv4_fd < 0)
83	return -1;	84	return -1;
84		85
85	sockinfo si (THISNODE, PROT_IPv4);	86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
86		87
87	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	88	#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	89	// this I really consider a linux bug. I am neither connected
95	// nor do I fragment myself. Linux still sets DF and doesn't	90	// nor do I fragment myself. Linux still sets DF and doesn't
96	// fragment for me sometimes.	91	// fragment for me sometimes.
97	{	92	{
98	int oval = IP_PMTUDISC_DONT;	93	int oval = IP_PMTUDISC_DONT;
99	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	94	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100	}	95	}
101	#endif	96	#endif
102		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
103	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
104	}	107	}
105		108
106	udpv4_fd = -1;	109	udpv4_fd = -1;
107		110
108	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
109	{	112	{
110	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111		114
112	if (udpv4_fd < 0)	115	if (udpv4_fd < 0)
113	return -1;	116	return -1;
		117
		118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
114		119
115	// standard daemon practise...	120	// standard daemon practise...
116	{	121	{
117	int oval = 1;	122	int oval = 1;
118	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119	}	124	}
120		125
121	sockinfo si (THISNODE, PROT_UDPv4);	126	#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	127	// this I really consider a linux bug. I am neither connected
131	// 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
132	// fragment for me sometimes.	129	// fragment for me sometimes.
133	{	130	{
134	int oval = IP_PMTUDISC_DONT;	131	int oval = IP_PMTUDISC_DONT;
135	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	132	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136	}	133	}
137	#endif	134	#endif
138		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
139	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		145	}
		146
		147	icmpv4_fd = -1;
		148
		149	#if ENABLE_ICMP
		150	if (THISNODE->protocols & PROT_ICMPv4)
		151	{
		152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		153
		154	if (icmpv4_fd < 0)
		155	return -1;
		156
		157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		158
		159	#ifdef ICMP_FILTER
		160	{
		161	icmp_filter oval;
		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);
140	}	167	}
		168	#endif
		169
		170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		171	// this I really consider a linux bug. I am neither connected
		172	// nor do I fragment myself. Linux still sets DF and doesn't
		173	// fragment for me sometimes.
		174	{
		175	int oval = IP_PMTUDISC_DONT;
		176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		177	}
		178	#endif
		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
		188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		189	}
		190	#endif
141		191
142	tcpv4_fd = -1;	192	tcpv4_fd = -1;
143		193
144	#if ENABLE_TCP	194	#if ENABLE_TCP
145	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
146	{	196	{
147	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
148		198
149	if (tcpv4_fd < 0)	199	if (tcpv4_fd < 0)
150	return -1;	200	return -1;
		201
		202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
151		203
152	// standard daemon practise...	204	// standard daemon practise...
153	{	205	{
154	int oval = 1;	206	int oval = 1;
155	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
158	sockinfo si (THISNODE, PROT_TCPv4);	210	sockinfo si (THISNODE, PROT_TCPv4);
159		211
160	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161	{	213	{
162	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));
163	exit (1);	215	exit (EXIT_FAILURE);
164	}	216	}
165		217
166	if (listen (tcpv4_fd, 5))	218	if (listen (tcpv4_fd, 5))
167	{	219	{
168	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));
169	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 ()))
170	}	245	{
		246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		247	exit (EXIT_FAILURE);
		248	}
171		249
172	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
173	}	251	}
174	#endif	252	#endif
175		253
176	tap = new tap_device ();	254	tap = new tap_device ();
177	if (!tap) //D this, of course, never catches	255	if (!tap) //D this, of course, never catches
178	{	256	{
179	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
180	exit (1);	258	exit (EXIT_FAILURE);
181	}	259	}
182		260
183	run_script (run_script_cb (this, &vpn::script_if_up), true);	261	run_script (run_script_cb (this, &vpn::script_if_up), true);
184		262
185	tap_ev_watcher.start (tap->fd, POLLIN);	263	tap_ev_watcher.start (tap->fd, EVENT_READ);
186		264
187	reconnect_all ();	265	reconnect_all ();
188		266
189	return 0;	267	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	}	268	}
214		269
215	bool	270	bool
216	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)
217	{	272	{
		273	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	274	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		275	#endif
219	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 ());
220		277
221	return true;	278	return true;
222	}	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
223		325
224	bool	326	bool
225	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)
226	{	328	{
		329	#if defined(SOL_IP) && defined(IP_TOS)
227	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	330	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		331	#endif
228	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 ());
229		333
230	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	}
231	}	354	}
232		355
233	void	356	void
234	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	357	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
235	{	358	{
…		…
249	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	372	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
250	else	373	else
251	{	374	{
252	connection *c = conns[src - 1];	375	connection *c = conns[src - 1];
253		376
254	if (dst == 0 && !THISNODE->routerprio)	377	if (dst == 0)
255	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	378	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
256	c->conf->nodename, (const char *)rsi);	379	c->conf->nodename, (const char *)rsi);
257	else if (dst != 0 && dst != THISNODE->id)	380	else if (dst != THISNODE->id)
258	{	381	{
259	if (THISNODE->routerprio)	382	if (THISNODE->routerprio)
260	// the tos setting gets lost here. who cares.	383	// the tos setting gets lost here. who cares.
261	conns[dst - 1]->inject_vpn_packet (pkt);	384	conns[dst - 1]->inject_vpn_packet (pkt);
262	else	385	else
…		…
269	c->recv_vpn_packet (pkt, rsi);	392	c->recv_vpn_packet (pkt, rsi);
270	}	393	}
271	}	394	}
272		395
273	void	396	void
274	vpn::udpv4_ev (io_watcher &w, short revents)	397	vpn::ipv4_ev (io_watcher &w, short revents)
275	{	398	{
276	if (revents & (POLLIN \| POLLERR))	399	if (revents & EVENT_READ)
277	{	400	{
278	vpn_packet *pkt = new vpn_packet;	401	vpn_packet *pkt = new vpn_packet;
279	struct sockaddr_in sa;	402	struct sockaddr_in sa;
280	socklen_t sa_len = sizeof (sa);	403	socklen_t sa_len = sizeof (sa);
281	int len;	404	int len;
282		405
283	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);
284		407
285	sockinfo si(sa, PROT_UDPv4);	408	sockinfo si(sa, PROT_IPv4);
286		409
287	if (len > 0)	410	if (len > 0)
288	{	411	{
289	pkt->len = len;	412	pkt->len = len;
290		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
291	recv_vpn_packet (pkt, si);	418	recv_vpn_packet (pkt, si);
292	}	419	}
293	else	420	else
294	{	421	{
295	// probably ECONNRESET or somesuch	422	// probably ECONNRESET or somesuch
296	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));
297	}	424	}
298		425
299	delete pkt;	426	delete pkt;
300	}
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	}	427	}
307	else	428	else
308	{	429	{
309	slog (L_ERR,	430	slog (L_ERR,
310	_("FATAL: unknown revents %08x in socket, terminating\n"),	431	_("FATAL: unknown revents %08x in socket, terminating\n"),
311	revents);	432	revents);
312	exit (1);	433	exit (EXIT_FAILURE);
313	}	434	}
314	}	435	}
315		436
		437	#if ENABLE_ICMP
316	void	438	void
317	vpn::ipv4_ev (io_watcher &w, short revents)	439	vpn::icmpv4_ev (io_watcher &w, short revents)
318	{	440	{
319	if (revents & (POLLIN \| POLLERR))	441	if (revents & EVENT_READ)
320	{	442	{
321	vpn_packet *pkt = new vpn_packet;	443	vpn_packet *pkt = new vpn_packet;
322	struct sockaddr_in sa;	444	struct sockaddr_in sa;
323	socklen_t sa_len = sizeof (sa);	445	socklen_t sa_len = sizeof (sa);
324	int len;	446	int len;
325		447
326	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);
327		449
328	sockinfo si(sa, PROT_IPv4);	450	sockinfo si(sa, PROT_ICMPv4);
329		451
330	if (len > 0)	452	if (len > 0)
331	{	453	{
332	pkt->len = len;	454	pkt->len = len;
333		455
		456	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		457
		458	if (hdr->type == ::conf.icmp_type
		459	&& hdr->code == 255)
		460	{
334	// 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
335	// this is slow, but...	462	// this is slow, but...
336	pkt->skip_hdr (IP_OVERHEAD);	463	pkt->skip_hdr (ICMP_OVERHEAD);
337		464
338	recv_vpn_packet (pkt, si);	465	recv_vpn_packet (pkt, si);
		466	}
339	}	467	}
340	else	468	else
341	{	469	{
342	// probably ECONNRESET or somesuch	470	// probably ECONNRESET or somesuch
343	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	471	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
344	}	472	}
345		473
346	delete pkt;	474	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	}	475	}
354	else	476	else
355	{	477	{
356	slog (L_ERR,	478	slog (L_ERR,
357	_("FATAL: unknown revents %08x in socket, terminating\n"),	479	_("FATAL: unknown revents %08x in socket, terminating\n"),
358	revents);	480	revents);
359	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);
360	}	520	}
361	}	521	}
362		522
363	void	523	void
364	vpn::tap_ev (io_watcher &w, short revents)	524	vpn::tap_ev (io_watcher &w, short revents)
365	{	525	{
366	if (revents & POLLIN)	526	if (revents & EVENT_READ)
367	{	527	{
368	/* process data */	528	/* process data */
369	tap_packet *pkt;	529	tap_packet *pkt;
370		530
371	pkt = tap->recv ();	531	pkt = tap->recv ();
372		532
		533	if (!pkt)
		534	return;
		535
		536	if (pkt->len > 14)
		537	{
373	int dst = mac2id (pkt->dst);	538	int dst = mac2id (pkt->dst);
374	int src = mac2id (pkt->src);	539	int src = mac2id (pkt->src);
375		540
376	if (src != THISNODE->id)	541	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	{	542	{
394	// unicast	543	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
395	if (dst != THISNODE->id)	544	exit (EXIT_FAILURE);
396	conns[dst - 1]->inject_data_packet (pkt);
397	}	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);
398	else	555	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);	556	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	}	557	}
411		558
412	delete pkt;	559	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	}	560	}
419	else	561	else
420	abort ();	562	abort ();
421	}	563	}
422		564
…		…
428	if (events & EVENT_SHUTDOWN)	570	if (events & EVENT_SHUTDOWN)
429	{	571	{
430	slog (L_INFO, _("preparing shutdown..."));	572	slog (L_INFO, _("preparing shutdown..."));
431		573
432	shutdown_all ();	574	shutdown_all ();
433
434	remove_pid (pidfilename);	575	remove_pid (conf.pidfilename);
435
436	slog (L_INFO, _("terminating"));	576	slog (L_INFO, _("terminating"));
437		577	exit (EXIT_SUCCESS);
438	exit (0);
439	}	578	}
440		579
441	if (events & EVENT_RECONNECT)	580	if (events & EVENT_RECONNECT)
442	{	581	{
443	slog (L_INFO, _("forced reconnect"));	582	slog (L_INFO, _("forced reconnect"));
…		…
445	reconnect_all ();	584	reconnect_all ();
446	}	585	}
447		586
448	events = 0;	587	events = 0;
449	}	588	}
450
451	w.at = TSTAMP_CANCEL;
452	}	589	}
453		590
454	void	591	void
455	vpn::shutdown_all ()	592	vpn::shutdown_all ()
456	{	593	{
…		…
469	connection_init ();	606	connection_init ();
470		607
471	for (configuration::node_vector::iterator i = conf.nodes.begin ();	608	for (configuration::node_vector::iterator i = conf.nodes.begin ();
472	i != conf.nodes.end (); ++i)	609	i != conf.nodes.end (); ++i)
473	{	610	{
474	connection *conn = new connection (this);	611	connection conn = new connection (this, i);
475
476	conn->conf = *i;
477	conns.push_back (conn);	612	conns.push_back (conn);
478
479	conn->establish_connection ();	613	conn->establish_connection ();
480	}	614	}
481	}	615	}
482		616
483	connection *vpn::find_router ()	617	connection *vpn::find_router ()
484	{	618	{
485	u32 prio = 0;	619	u32 prio = 1;
486	connection *router = 0;	620	connection *router = 0;
487		621
488	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	622	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489	{	623	{
490	connection c = i;	624	connection c = i;
491		625
492	if (c->conf->routerprio > prio	626	if (c->conf->routerprio > prio
493	&& c->connectmode == conf_node::C_ALWAYS	627	&& 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)	628	&& c->ictx && c->octx
		629	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
496	{	630	{
497	prio = c->conf->routerprio;	631	prio = c->conf->routerprio;
498	router = c;	632	router = c;
499	}	633	}
500	}	634	}
…		…
509	if (c)	643	if (c)
510	c->send_connect_request (id);	644	c->send_connect_request (id);
511	else	645	else
512	// no router found, aggressively connect to all routers	646	// no router found, aggressively connect to all routers
513	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	647	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
514	if ((*i)->conf->routerprio)	648	if ((i)->conf->routerprio && (i)->conf != THISNODE)
515	(*i)->establish_connection ();	649	(*i)->establish_connection ();
516	}	650	}
517		651
518	void	652	void
519	connection::dump_status ()	653	connection::dump_status ()
…		…
537		671
538	slog (L_NOTICE, _("END status dump"));	672	slog (L_NOTICE, _("END status dump"));
539	}	673	}
540		674
541	vpn::vpn (void)	675	vpn::vpn (void)
542	: event(this, &vpn::event_cb)	676	: event (this, &vpn::event_cb)
543	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	677	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
544	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	678	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
545	, tap_ev_watcher (this, &vpn::tap_ev)
546	#if ENABLE_TCP	679	#if ENABLE_TCP
547	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	680	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
548	#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)
549	{	689	{
550	}	690	}
551		691
552	vpn::~vpn ()	692	vpn::~vpn ()
553	{	693	{

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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 1.27 by pcg, Tue Mar 1 06:27:20 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 1.27 by pcg, Tue Mar 1 06:27:20 2005 UTC