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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.23 by pcg, Thu Jan 29 18:55:10 2004 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);
167	}	222	}
168		223
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
170	}	225	}
171	#endif	226	#endif
172		227
173	tap = new tap_device ();	228	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	229	if (!tap) //D this, of course, never catches
175	{	230	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	231	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	232	exit (EXIT_FAILURE);
178	}	233	}
179		234
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	235	run_script (run_script_cb (this, &vpn::script_if_up), true);
181		236
182	tap_ev_watcher.start (tap->fd, POLLIN);	237	tap_ev_watcher.start (tap->fd, EVENT_READ);
183		238
184	reconnect_all ();	239	reconnect_all ();
185		240
186	return 0;	241	return 0;
187	}	242	}
188		243
189	// send a vpn packet out to other hosts	244	// send a vpn packet out to other hosts
190	void	245	bool
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	246	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{	247	{
193	switch (si.prot)	248	switch (si.prot)
194	{	249	{
195	case PROT_IPv4:	250	case PROT_IPv4:
196	send_ipv4_packet (pkt, si, tos);	251	return send_ipv4_packet (pkt, si, tos);
197	break;
198		252
199	case PROT_UDPv4:	253	case PROT_UDPv4:
200	send_udpv4_packet (pkt, si, tos);	254	return send_udpv4_packet (pkt, si, tos);
201	break;
202		255
203	#if ENABLE_TCP	256	#if ENABLE_TCP
204	case PROT_TCPv4:	257	case PROT_TCPv4:
205	send_tcpv4_packet (pkt, si, tos);	258	return send_tcpv4_packet (pkt, si, tos);
206	break;	259	#endif
		260
		261	#if ENABLE_ICMP
		262	case PROT_ICMPv4:
		263	return send_icmpv4_packet (pkt, si, tos);
207	#endif	264	#endif
208		265
209	default:	266	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);	267	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	abort ();	268	return false;
212	}	269	}
213	}	270	}
214		271
215	void	272	bool
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	273	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	274	{
		275	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	276	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		277	#endif
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	278	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220	}
221		279
222	void	280	return true;
		281	}
		282
		283	static u16
		284	ipv4_checksum (u16 *data, unsigned int len)
		285	{
		286	// use 32 bit accumulator and fold back carry bits at the end
		287	u32 sum = 0;
		288
		289	while (len > 1)
		290	{
		291	sum += *data++;
		292	len -= 2;
		293	}
		294
		295	// odd byte left?
		296	if (len)
		297	sum += (u8 )data;
		298
		299	// add back carry bits
		300	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		301	sum += (sum >> 16); // carry
		302
		303	return ~sum;
		304	}
		305
		306	#if ENABLE_ICMP
		307	bool
		308	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		309	{
		310	#if defined(SOL_IP) && defined(IP_TOS)
		311	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		312	#endif
		313
		314	pkt->unshift_hdr (4);
		315
		316	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		317	hdr->type = ::conf.icmp_type;
		318	hdr->code = 255;
		319	hdr->checksum = 0;
		320	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		321
		322	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		323
		324	return true;
		325	}
		326	#endif
		327
		328	bool
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	329	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
224	{	330	{
		331	#if defined(SOL_IP) && defined(IP_TOS)
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	332	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		333	#endif
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	334	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		335
		336	return true;
		337	}
		338
		339	void
		340	vpn::inject_data_packet (tap_packet *pkt, int dst)
		341	{
		342	if (dst)
		343	{
		344	// unicast
		345	if (dst != THISNODE->id)
		346	conns[dst - 1]->inject_data_packet (pkt);
		347	}
		348	else
		349	{
		350	// broadcast, this is ugly, but due to the security policy
		351	// we have to connect to all hosts...
		352	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		353	if ((*c)->conf != THISNODE)
		354	(*c)->inject_data_packet (pkt, true);
		355	}
227	}	356	}
228		357
229	void	358	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	359	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	360	{
…		…
245	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	374	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
246	else	375	else
247	{	376	{
248	connection *c = conns[src - 1];	377	connection *c = conns[src - 1];
249		378
250	if (dst == 0 && !THISNODE->routerprio)	379	if (dst == 0)
251	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	380	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
252	c->conf->nodename, (const char *)rsi);	381	c->conf->nodename, (const char *)rsi);
253	else if (dst != 0 && dst != THISNODE->id)	382	else if (dst != THISNODE->id)
254	{	383	{
255	if (THISNODE->routerprio)	384	if (THISNODE->routerprio)
256	// the tos setting gets lost here. who cares.	385	// the tos setting gets lost here. who cares.
257	conns[dst - 1]->inject_vpn_packet (pkt);	386	conns[dst - 1]->inject_vpn_packet (pkt);
258	else	387	else
…		…
265	c->recv_vpn_packet (pkt, rsi);	394	c->recv_vpn_packet (pkt, rsi);
266	}	395	}
267	}	396	}
268		397
269	void	398	void
270	vpn::udpv4_ev (io_watcher &w, short revents)	399	vpn::ipv4_ev (io_watcher &w, short revents)
271	{	400	{
272	if (revents & (POLLIN \| POLLERR))	401	if (revents & EVENT_READ)
273	{	402	{
274	vpn_packet *pkt = new vpn_packet;	403	vpn_packet *pkt = new vpn_packet;
275	struct sockaddr_in sa;	404	struct sockaddr_in sa;
276	socklen_t sa_len = sizeof (sa);	405	socklen_t sa_len = sizeof (sa);
277	int len;	406	int len;
278		407
279	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	408	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
280		409
281	sockinfo si(sa, PROT_UDPv4);	410	sockinfo si(sa, PROT_IPv4);
282		411
283	if (len > 0)	412	if (len > 0)
284	{	413	{
285	pkt->len = len;	414	pkt->len = len;
286		415
		416	// raw sockets deliver the ipv4, but don't expect it on sends
		417	// this is slow, but...
		418	pkt->skip_hdr (IP_OVERHEAD);
		419
287	recv_vpn_packet (pkt, si);	420	recv_vpn_packet (pkt, si);
288	}	421	}
289	else	422	else
290	{	423	{
291	// probably ECONNRESET or somesuch	424	// probably ECONNRESET or somesuch
292	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	425	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
293	}	426	}
294		427
295	delete pkt;	428	delete pkt;
296	}
297	else if (revents & POLLHUP)
298	{
299	// this cannot ;) happen on udp sockets
300	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
301	exit (1);
302	}	429	}
303	else	430	else
304	{	431	{
305	slog (L_ERR,	432	slog (L_ERR,
306	_("FATAL: unknown revents %08x in socket, terminating\n"),	433	_("FATAL: unknown revents %08x in socket, terminating\n"),
307	revents);	434	revents);
308	exit (1);	435	exit (EXIT_FAILURE);
309	}	436	}
310	}	437	}
311		438
		439	#if ENABLE_ICMP
312	void	440	void
313	vpn::ipv4_ev (io_watcher &w, short revents)	441	vpn::icmpv4_ev (io_watcher &w, short revents)
314	{	442	{
315	if (revents & (POLLIN \| POLLERR))	443	if (revents & EVENT_READ)
316	{	444	{
317	vpn_packet *pkt = new vpn_packet;	445	vpn_packet *pkt = new vpn_packet;
318	struct sockaddr_in sa;	446	struct sockaddr_in sa;
319	socklen_t sa_len = sizeof (sa);	447	socklen_t sa_len = sizeof (sa);
320	int len;	448	int len;
321		449
322	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	450	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
323		451
324	sockinfo si(sa, PROT_IPv4);	452	sockinfo si(sa, PROT_ICMPv4);
325		453
326	if (len > 0)	454	if (len > 0)
327	{	455	{
328	pkt->len = len;	456	pkt->len = len;
329		457
		458	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		459
		460	if (hdr->type == ::conf.icmp_type
		461	&& hdr->code == 255)
		462	{
330	// raw sockets deliver the ipv4, but don't expect it on sends	463	// raw sockets deliver the ipv4, but don't expect it on sends
331	// this is slow, but...	464	// this is slow, but...
332	pkt->skip_hdr (IP_OVERHEAD);	465	pkt->skip_hdr (ICMP_OVERHEAD);
333		466
334	recv_vpn_packet (pkt, si);	467	recv_vpn_packet (pkt, si);
		468	}
335	}	469	}
336	else	470	else
337	{	471	{
338	// probably ECONNRESET or somesuch	472	// probably ECONNRESET or somesuch
339	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	473	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
340	}	474	}
341		475
342	delete pkt;	476	delete pkt;
343	}
344	else if (revents & POLLHUP)
345	{
346	// this cannot ;) happen on udp sockets
347	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
348	exit (1);
349	}	477	}
350	else	478	else
351	{	479	{
352	slog (L_ERR,	480	slog (L_ERR,
353	_("FATAL: unknown revents %08x in socket, terminating\n"),	481	_("FATAL: unknown revents %08x in socket, terminating\n"),
354	revents);	482	revents);
355	exit (1);	483	exit (EXIT_FAILURE);
		484	}
		485	}
		486	#endif
		487
		488	void
		489	vpn::udpv4_ev (io_watcher &w, short revents)
		490	{
		491	if (revents & EVENT_READ)
		492	{
		493	vpn_packet *pkt = new vpn_packet;
		494	struct sockaddr_in sa;
		495	socklen_t sa_len = sizeof (sa);
		496	int len;
		497
		498	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		499
		500	sockinfo si(sa, PROT_UDPv4);
		501
		502	if (len > 0)
		503	{
		504	pkt->len = len;
		505
		506	recv_vpn_packet (pkt, si);
		507	}
		508	else
		509	{
		510	// probably ECONNRESET or somesuch
		511	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		512	}
		513
		514	delete pkt;
		515	}
		516	else
		517	{
		518	slog (L_ERR,
		519	_("FATAL: unknown revents %08x in socket, terminating\n"),
		520	revents);
		521	exit (EXIT_FAILURE);
356	}	522	}
357	}	523	}
358		524
359	void	525	void
360	vpn::tap_ev (io_watcher &w, short revents)	526	vpn::tap_ev (io_watcher &w, short revents)
361	{	527	{
362	if (revents & POLLIN)	528	if (revents & EVENT_READ)
363	{	529	{
364	/* process data */	530	/* process data */
365	tap_packet *pkt;	531	tap_packet *pkt;
366		532
367	pkt = tap->recv ();	533	pkt = tap->recv ();
368		534
		535	if (!pkt)
		536	return;
		537
		538	if (pkt->len > 14)
		539	{
369	int dst = mac2id (pkt->dst);	540	int dst = mac2id (pkt->dst);
370	int src = mac2id (pkt->src);	541	int src = mac2id (pkt->src);
371		542
372	if (src != THISNODE->id)	543	if (src != THISNODE->id)
373	{
374	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
375	exit (1);
376	}
377
378	if (dst == THISNODE->id)
379	{
380	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
381	exit (1);
382	}
383
384	if (dst > conns.size ())
385	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
386	else
387	{
388	if (dst)
389	{	544	{
390	// unicast	545	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
391	if (dst != THISNODE->id)	546	exit (EXIT_FAILURE);
392	conns[dst - 1]->inject_data_packet (pkt);
393	}	547	}
		548
		549	if (dst == THISNODE->id)
		550	{
		551	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		552	exit (EXIT_FAILURE);
		553	}
		554
		555	if (dst > conns.size ())
		556	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
394	else	557	else
395	{
396	// broadcast, first check router, then self, then english
397	connection *router = find_router ();
398
399	if (router)
400	router->inject_data_packet (pkt, true);	558	inject_data_packet (pkt, dst);
401	else
402	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
403	if ((*c)->conf != THISNODE)
404	(*c)->inject_data_packet (pkt);
405	}
406	}	559	}
407		560
408	delete pkt;	561	delete pkt;
409	}
410	else if (revents & (POLLHUP \| POLLERR))
411	{
412	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
413	exit (1);
414	}	562	}
415	else	563	else
416	abort ();	564	abort ();
417	}	565	}
418		566
…		…
424	if (events & EVENT_SHUTDOWN)	572	if (events & EVENT_SHUTDOWN)
425	{	573	{
426	slog (L_INFO, _("preparing shutdown..."));	574	slog (L_INFO, _("preparing shutdown..."));
427		575
428	shutdown_all ();	576	shutdown_all ();
429
430	remove_pid (pidfilename);	577	remove_pid (pidfilename);
431
432	slog (L_INFO, _("terminating"));	578	slog (L_INFO, _("terminating"));
433		579	exit (EXIT_SUCCESS);
434	exit (0);
435	}	580	}
436		581
437	if (events & EVENT_RECONNECT)	582	if (events & EVENT_RECONNECT)
438	{	583	{
439	slog (L_INFO, _("forced reconnect"));	584	slog (L_INFO, _("forced reconnect"));
…		…
441	reconnect_all ();	586	reconnect_all ();
442	}	587	}
443		588
444	events = 0;	589	events = 0;
445	}	590	}
446
447	w.at = TSTAMP_CANCEL;
448	}	591	}
449		592
450	void	593	void
451	vpn::shutdown_all ()	594	vpn::shutdown_all ()
452	{	595	{
…		…
476	}	619	}
477	}	620	}
478		621
479	connection *vpn::find_router ()	622	connection *vpn::find_router ()
480	{	623	{
481	u32 prio = 0;	624	u32 prio = 1;
482	connection *router = 0;	625	connection *router = 0;
483		626
484	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	627	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
485	{	628	{
486	connection c = i;	629	connection c = i;
487		630
488	if (c->conf->routerprio > prio	631	if (c->conf->routerprio > prio
489	&& c->connectmode == conf_node::C_ALWAYS	632	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
490	&& c->conf != THISNODE
491	&& c->ictx && c->octx)	633	&& c->ictx && c->octx
		634	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
492	{	635	{
493	prio = c->conf->routerprio;	636	prio = c->conf->routerprio;
494	router = c;	637	router = c;
495	}	638	}
496	}	639	}
497		640
498	return router;	641	return router;
499	}	642	}
500		643
501	void vpn::connect_request (int id)	644	void vpn::send_connect_request (int id)
502	{	645	{
503	connection *c = find_router ();	646	connection *c = find_router ();
504		647
505	if (c)	648	if (c)
506	c->connect_request (id);	649	c->send_connect_request (id);
507	//else // does not work, because all others must connect to the same router	650	else
508	// // no router found, aggressively connect to all routers	651	// no router found, aggressively connect to all routers
509	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	652	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
510	// if ((*i)->conf->routerprio)	653	if ((i)->conf->routerprio && (i)->conf != THISNODE)
511	// (*i)->establish_connection ();	654	(*i)->establish_connection ();
512	}	655	}
513		656
514	void	657	void
515	connection::dump_status ()	658	connection::dump_status ()
516	{	659	{
…		…
533		676
534	slog (L_NOTICE, _("END status dump"));	677	slog (L_NOTICE, _("END status dump"));
535	}	678	}
536		679
537	vpn::vpn (void)	680	vpn::vpn (void)
538	: event(this, &vpn::event_cb)	681	: event (this, &vpn::event_cb)
539	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	682	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
540	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	683	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
541	, tap_ev_watcher (this, &vpn::tap_ev)
542	#if ENABLE_TCP	684	#if ENABLE_TCP
543	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	685	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
544	#endif	686	#endif
		687	#if ENABLE_ICMP
		688	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		689	#endif
		690	, tap_ev_watcher (this, &vpn::tap_ev)
545	{	691	{
546	}	692	}
547		693
548	vpn::~vpn ()	694	vpn::~vpn ()
549	{	695	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.23 by pcg, Thu Jan 29 18:55:10 2004 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.23 by pcg, Thu Jan 29 18:55:10 2004 UTC