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

Comparing gvpe/src/connection.C (file contents):
Revision 1.20 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.55 by pcg, Tue Apr 26 00:55:56 2005 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	extern "C" {	24	#include <cassert>
22	# include "lzf/lzf.h"
23	}
24		25
25	#include <list>	26	#include <list>
26		27
27	#include <openssl/rand.h>	28	#include <openssl/rand.h>
28	#include <openssl/evp.h>	29	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	30	#include <openssl/rsa.h>
30	#include <openssl/err.h>	31	#include <openssl/err.h>
31
32	#include "gettext.h"
33		32
34	#include "conf.h"	33	#include "conf.h"
35	#include "slog.h"	34	#include "slog.h"
36	#include "device.h"	35	#include "device.h"
37	#include "vpn.h"	36	#include "vpn.h"
43	# define RAND_pseudo_bytes RAND_bytes	42	# define RAND_pseudo_bytes RAND_bytes
44	#endif	43	#endif
45		44
46	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
47		46
		47	#define ULTRA_FAST 1
		48	#define HLOG 15
		49	#include "lzf/lzf.h"
		50	#include "lzf/lzf_c.c"
		51	#include "lzf/lzf_d.c"
		52
48	struct crypto_ctx	53	struct crypto_ctx
49	{	54	{
50	EVP_CIPHER_CTX cctx;	55	EVP_CIPHER_CTX cctx;
51	HMAC_CTX hctx;	56	HMAC_CTX hctx;
52		57
…		…
55	};	60	};
56		61
57	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
58	{	63	{
59	EVP_CIPHER_CTX_init (&cctx);	64	EVP_CIPHER_CTX_init (&cctx);
60	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
61	HMAC_CTX_init (&hctx);	66	HMAC_CTX_init (&hctx);
62	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
63	}	68	}
64		69
65	crypto_ctx::~crypto_ctx ()	70	crypto_ctx::~crypto_ctx ()
66	{	71	{
67	EVP_CIPHER_CTX_cleanup (&cctx);	72	require (EVP_CIPHER_CTX_cleanup (&cctx));
68	HMAC_CTX_cleanup (&hctx);	73	HMAC_CTX_cleanup (&hctx);
69	}	74	}
70		75
71	static void	76	static void
72	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
73	{	78	{
74	EVP_MD_CTX ctx;	79	EVP_MD_CTX ctx;
75		80
76	EVP_MD_CTX_init (&ctx);	81	EVP_MD_CTX_init (&ctx);
77	EVP_DigestInit (&ctx, RSA_HASH);	82	require (EVP_DigestInit (&ctx, RSA_HASH));
78	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
79	EVP_DigestUpdate(&ctx, &id, sizeof id);	84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
80	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
81	EVP_MD_CTX_cleanup (&ctx);	86	EVP_MD_CTX_cleanup (&ctx);
82	}	87	}
83		88
84	struct rsa_entry {	89	struct rsa_entry {
85	tstamp expire;	90	tstamp expire;
…		…
90	struct rsa_cache : list<rsa_entry>	95	struct rsa_cache : list<rsa_entry>
91	{	96	{
92	void cleaner_cb (time_watcher &w); time_watcher cleaner;	97	void cleaner_cb (time_watcher &w); time_watcher cleaner;
93		98
94	bool find (const rsaid &id, rsachallenge &chg)	99	bool find (const rsaid &id, rsachallenge &chg)
95	{	100	{
96	for (iterator i = begin (); i != end (); ++i)	101	for (iterator i = begin (); i != end (); ++i)
97	{	102	{
98	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
99	{	104	{
100	memcpy (&chg, &i->chg, sizeof chg);	105	memcpy (&chg, &i->chg, sizeof chg);
101		106
102	erase (i);	107	erase (i);
103	return true;	108	return true;
104	}	109	}
105	}	110	}
106		111
107	if (cleaner.at < NOW)	112	if (cleaner.at < NOW)
108	cleaner.start (NOW + RSA_TTL);	113	cleaner.start (NOW + RSA_TTL);
109		114
110	return false;	115	return false;
111	}	116	}
112		117
113	void gen (rsaid &id, rsachallenge &chg)	118	void gen (rsaid &id, rsachallenge &chg)
114	{	119	{
115	rsa_entry e;	120	rsa_entry e;
116		121
117	RAND_bytes ((unsigned char *)&id, sizeof id);	122	RAND_bytes ((unsigned char *)&id, sizeof id);
118	RAND_bytes ((unsigned char *)&chg, sizeof chg);	123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
119		124
120	e.expire = NOW + RSA_TTL;	125	e.expire = NOW + RSA_TTL;
121	e.id = id;	126	e.id = id;
122	memcpy (&e.chg, &chg, sizeof chg);	127	memcpy (&e.chg, &chg, sizeof chg);
123		128
124	push_back (e);	129	push_back (e);
125		130
126	if (cleaner.at < NOW)	131	if (cleaner.at < NOW)
127	cleaner.start (NOW + RSA_TTL);	132	cleaner.start (NOW + RSA_TTL);
128	}	133	}
129		134
130	rsa_cache ()	135	rsa_cache ()
131	: cleaner (this, &rsa_cache::cleaner_cb)	136	: cleaner (this, &rsa_cache::cleaner_cb)
132	{ }	137	{ }
133		138
134	} rsa_cache;	139	} rsa_cache;
135		140
136	void rsa_cache::cleaner_cb (time_watcher &w)	141	void rsa_cache::cleaner_cb (time_watcher &w)
137	{	142	{
138	if (empty ())	143	if (!empty ())
139	w.at = TSTAMP_CANCEL;
140	else
141	{	144	{
142	w.at = NOW + RSA_TTL;	145	w.start (NOW + RSA_TTL);
143		146
144	for (iterator i = begin (); i != end (); )	147	for (iterator i = begin (); i != end (); )
145	if (i->expire <= NOW)	148	if (i->expire <= NOW)
146	i = erase (i);	149	i = erase (i);
147	else	150	else
…		…
199	// only do action once every x seconds per host whole allowing bursts.	202	// only do action once every x seconds per host whole allowing bursts.
200	// this implementation ("splay list" ;) is inefficient,	203	// this implementation ("splay list" ;) is inefficient,
201	// but low on resources.	204	// but low on resources.
202	struct net_rate_limiter : list<net_rateinfo>	205	struct net_rate_limiter : list<net_rateinfo>
203	{	206	{
204	static const double ALPHA = 1. - 1. / 600.; // allow bursts	207	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
205	static const double CUTOFF = 10.; // one event every CUTOFF seconds	208	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
206	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	209	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
207	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	210	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
208		211
209	bool can (const sockinfo &si) { return can((u32)si.host); }	212	bool can (const sockinfo &si) { return can((u32)si.host); }
210	bool can (u32 host);	213	bool can (u32 host);
211	};	214	};
212		215
…		…
217	iterator i;	220	iterator i;
218		221
219	for (i = begin (); i != end (); )	222	for (i = begin (); i != end (); )
220	if (i->host == host)	223	if (i->host == host)
221	break;	224	break;
222	else if (i->last < NOW - EXPIRE)	225	else if (i->last < NOW - NRL_EXPIRE)
223	i = erase (i);	226	i = erase (i);
224	else	227	else
225	i++;	228	i++;
226		229
227	if (i == end ())	230	if (i == end ())
228	{	231	{
229	net_rateinfo ri;	232	net_rateinfo ri;
230		233
231	ri.host = host;	234	ri.host = host;
232	ri.pcnt = 1.;	235	ri.pcnt = 1.;
233	ri.diff = MAXDIF;	236	ri.diff = NRL_MAXDIF;
234	ri.last = NOW;	237	ri.last = NOW;
235		238
236	push_front (ri);	239	push_front (ri);
237		240
238	return true;	241	return true;
…		…
240	else	243	else
241	{	244	{
242	net_rateinfo ri (*i);	245	net_rateinfo ri (*i);
243	erase (i);	246	erase (i);
244		247
245	ri.pcnt = ri.pcnt * ALPHA;	248	ri.pcnt = ri.pcnt * NRL_ALPHA;
246	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
247		250
248	ri.last = NOW;	251	ri.last = NOW;
249		252
250	double dif = ri.diff / ri.pcnt;	253	double dif = ri.diff / ri.pcnt;
251		254
252	bool send = dif > CUTOFF;	255	bool send = dif > NRL_CUTOFF;
253		256
254	if (dif > MAXDIF)	257	if (dif > NRL_MAXDIF)
255	{	258	{
256	ri.pcnt = 1.;	259	ri.pcnt = 1.;
257	ri.diff = MAXDIF;	260	ri.diff = NRL_MAXDIF;
258	}	261	}
259	else if (send)	262	else if (send)
260	ri.pcnt++;	263	ri.pcnt++;
261		264
262	push_front (ri);	265	push_front (ri);
…		…
309	}	312	}
310		313
311	#define MAXVPNDATA (MAX_MTU - 6 - 6)	314	#define MAXVPNDATA (MAX_MTU - 6 - 6)
312	#define DATAHDR (sizeof (u32) + RAND_SIZE)	315	#define DATAHDR (sizeof (u32) + RAND_SIZE)
313		316
314	struct vpndata_packet:vpn_packet	317	struct vpndata_packet : vpn_packet
315	{	318	{
316	u8 data[MAXVPNDATA + DATAHDR]; // seqno	319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
317		320
318	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	321	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
319	tap_packet unpack (connection conn, u32 &seqno);	322	tap_packet unpack (connection conn, u32 &seqno);
…		…
332	int outl = 0, outl2;	335	int outl = 0, outl2;
333	ptype type = PT_DATA_UNCOMPRESSED;	336	ptype type = PT_DATA_UNCOMPRESSED;
334		337
335	#if ENABLE_COMPRESSION	338	#if ENABLE_COMPRESSION
336	u8 cdata[MAX_MTU];	339	u8 cdata[MAX_MTU];
337	u32 cl;
338		340
		341	if (conn->features & ENABLE_COMPRESSION)
		342	{
339	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		344
340	if (cl)	345	if (cl)
341	{	346	{
342	type = PT_DATA_COMPRESSED;	347	type = PT_DATA_COMPRESSED;
343	d = cdata;	348	d = cdata;
344	l = cl + 2;	349	l = cl + 2;
345		350
346	d[0] = cl >> 8;	351	d[0] = cl >> 8;
347	d[1] = cl;	352	d[1] = cl;
		353	}
348	}	354	}
349	#endif	355	#endif
350		356
351	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
352		358
353	struct {	359	struct {
354	#if RAND_SIZE	360	#if RAND_SIZE
355	u8 rnd[RAND_SIZE];	361	u8 rnd[RAND_SIZE];
356	#endif	362	#endif
…		…
360	datahdr.seqno = ntohl (seqno);	366	datahdr.seqno = ntohl (seqno);
361	#if RAND_SIZE	367	#if RAND_SIZE
362	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
363	#endif	369	#endif
364		370
365	EVP_EncryptUpdate (cctx,	371	require (EVP_EncryptUpdate (cctx,
366	(unsigned char *) data + outl, &outl2,	372	(unsigned char *) data + outl, &outl2,
367	(unsigned char *) &datahdr, DATAHDR);	373	(unsigned char *) &datahdr, DATAHDR));
368	outl += outl2;	374	outl += outl2;
369		375
370	EVP_EncryptUpdate (cctx,	376	require (EVP_EncryptUpdate (cctx,
371	(unsigned char *) data + outl, &outl2,	377	(unsigned char *) data + outl, &outl2,
372	(unsigned char *) d, l);	378	(unsigned char *) d, l));
373	outl += outl2;	379	outl += outl2;
374		380
375	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	381	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
376	outl += outl2;	382	outl += outl2;
377		383
378	len = outl + data_hdr_size ();	384	len = outl + data_hdr_size ();
379		385
380	set_hdr (type, dst);	386	set_hdr (type, dst);
…		…
389	int outl = 0, outl2;	395	int outl = 0, outl2;
390	tap_packet *p = new tap_packet;	396	tap_packet *p = new tap_packet;
391	u8 *d;	397	u8 *d;
392	u32 l = len - data_hdr_size ();	398	u32 l = len - data_hdr_size ();
393		399
394	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
395		401
396	#if ENABLE_COMPRESSION	402	#if ENABLE_COMPRESSION
397	u8 cdata[MAX_MTU];	403	u8 cdata[MAX_MTU];
398		404
399	if (type == PT_DATA_COMPRESSED)	405	if (type == PT_DATA_COMPRESSED)
…		…
401	else	407	else
402	#endif	408	#endif
403	d = &(*p)[6 + 6 - DATAHDR];	409	d = &(*p)[6 + 6 - DATAHDR];
404		410
405	/* this overwrites part of the src mac, but we fix that later */	411	/* this overwrites part of the src mac, but we fix that later */
406	EVP_DecryptUpdate (cctx,	412	require (EVP_DecryptUpdate (cctx,
407	d, &outl2,	413	d, &outl2,
408	(unsigned char *)&data, len - data_hdr_size ());	414	(unsigned char *)&data, len - data_hdr_size ()));
409	outl += outl2;	415	outl += outl2;
410		416
411	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	417	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
412	outl += outl2;	418	outl += outl2;
413		419
414	seqno = ntohl ((u32 )(d + RAND_SIZE));	420	seqno = ntohl ((u32 )(d + RAND_SIZE));
415		421
416	id2mac (dst () ? dst() : THISNODE->id, p->dst);	422	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
445	{	451	{
446	// actually, hmaclen cannot be checked because the hmac	452	// actually, hmaclen cannot be checked because the hmac
447	// field comes before this data, so peers with other	453	// field comes before this data, so peers with other
448	// hmacs simply will not work.	454	// hmacs simply will not work.
449	u8 prot_major, prot_minor, randsize, hmaclen;	455	u8 prot_major, prot_minor, randsize, hmaclen;
450	u8 flags, challengelen, pad2, pad3;	456	u8 flags, challengelen, features, pad3;
451	u32 cipher_nid, digest_nid, hmac_nid;	457	u32 cipher_nid, digest_nid, hmac_nid;
452
453	const u8 curflags () const
454	{
455	return 0x80
456	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
457	}
458		458
459	void setup (ptype type, int dst);	459	void setup (ptype type, int dst);
460	bool chk_config () const;	460	bool chk_config () const;
		461
		462	static u8 get_features ()
		463	{
		464	u8 f = 0;
		465	#if ENABLE_COMPRESSION
		466	f \|= FEATURE_COMPRESSION;
		467	#endif
		468	#if ENABLE_ROHC
		469	f \|= FEATURE_ROHC;
		470	#endif
		471	return f;
		472	}
461	};	473	};
462		474
463	void config_packet::setup (ptype type, int dst)	475	void config_packet::setup (ptype type, int dst)
464	{	476	{
465	prot_major = PROTOCOL_MAJOR;	477	prot_major = PROTOCOL_MAJOR;
466	prot_minor = PROTOCOL_MINOR;	478	prot_minor = PROTOCOL_MINOR;
467	randsize = RAND_SIZE;	479	randsize = RAND_SIZE;
468	hmaclen = HMACLENGTH;	480	hmaclen = HMACLENGTH;
469	flags = curflags ();	481	flags = 0;
470	challengelen = sizeof (rsachallenge);	482	challengelen = sizeof (rsachallenge);
		483	features = get_features ();
471		484
472	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
473	digest_nid = htonl (EVP_MD_type (RSA_HASH));	486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
474	hmac_nid = htonl (EVP_MD_type (DIGEST));	487	hmac_nid = htonl (EVP_MD_type (DIGEST));
475		488
…		…
478	}	491	}
479		492
480	bool config_packet::chk_config () const	493	bool config_packet::chk_config () const
481	{	494	{
482	if (prot_major != PROTOCOL_MAJOR)	495	if (prot_major != PROTOCOL_MAJOR)
483	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
484	else if (randsize != RAND_SIZE)	497	else if (randsize != RAND_SIZE)
485	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
486	else if (hmaclen != HMACLENGTH)	499	else if (hmaclen != HMACLENGTH)
487	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);	500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
488	else if (flags != curflags ())
489	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
490	else if (challengelen != sizeof (rsachallenge))	501	else if (challengelen != sizeof (rsachallenge))
491	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));	502	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
492	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	503	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
493	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	504	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
494	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	505	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
495	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));	506	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
496	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	507	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
497	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	508	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
498	else	509	else
499	return true;	510	return true;
500		511
501	return false;	512	return false;
502	}	513	}
503		514
504	struct auth_req_packet : config_packet	515	struct auth_req_packet : config_packet
505	{	516	{
506	char magic[8];	517	char magic[8];
507	u8 initiate; // false if this is just an automatic reply	518	u8 initiate; // false if this is just an automatic reply
508	u8 protocols; // supported protocols (will get patches on forward)	519	u8 protocols; // supported protocols (will be patched on forward)
509	u8 pad2, pad3;	520	u8 pad2, pad3;
510	rsaid id;	521	rsaid id;
511	rsaencrdata encr;	522	rsaencrdata encr;
512		523
513	auth_req_packet (int dst, bool initiate_, u8 protocols_)	524	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
574	{	585	{
575	if (ictx && octx)	586	if (ictx && octx)
576	{	587	{
577	connectmode = conf->connectmode;	588	connectmode = conf->connectmode;
578		589
		590	// make sure rekeying timeouts are slightly asymmetric
579	rekey.start (NOW + ::conf.rekey);	591	rekey.start (NOW + ::conf.rekey
		592	+ (conf->id > THISNODE->id ? 10 : 0));
580	keepalive.start (NOW + ::conf.keepalive);	593	keepalive.start (NOW + ::conf.keepalive);
581		594
582	// send queued packets	595	// send queued packets
583	if (ictx && octx)	596	if (ictx && octx)
584	{	597	{
…		…
597	}	610	}
598	else	611	else
599	{	612	{
600	retry_cnt = 0;	613	retry_cnt = 0;
601	establish_connection.start (NOW + 5);	614	establish_connection.start (NOW + 5);
602	keepalive.reset ();	615	keepalive.stop ();
603	rekey.reset ();	616	rekey.stop ();
604	}	617	}
605	}	618	}
606		619
607	void	620	void
608	connection::reset_si ()	621	connection::reset_si ()
…		…
610	protocol = best_protocol (THISNODE->protocols & conf->protocols);	623	protocol = best_protocol (THISNODE->protocols & conf->protocols);
611		624
612	// mask out protocols we cannot establish	625	// mask out protocols we cannot establish
613	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	626	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
614	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	627	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		628	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
615		629
616	si.set (conf, protocol);	630	si.set (conf, protocol);
617	}	631	}
618		632
619	// ensure sockinfo is valid, forward if necessary	633	// ensure sockinfo is valid, forward if necessary
…		…
624	{	638	{
625	connection *r = vpn->find_router ();	639	connection *r = vpn->find_router ();
626		640
627	if (r)	641	if (r)
628	{	642	{
629	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	643	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
630	conf->nodename, r->conf->nodename);	644	conf->nodename, r->conf->nodename, (const char *)r->si);
631	return r->si;	645	return r->si;
632	}	646	}
633	else	647	else
634	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	648	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
635	conf->nodename);	649	conf->nodename);
…		…
674	connection::send_auth_request (const sockinfo &si, bool initiate)	688	connection::send_auth_request (const sockinfo &si, bool initiate)
675	{	689	{
676	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	690	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
677		691
678	rsachallenge chg;	692	rsachallenge chg;
679
680	rsa_cache.gen (pkt->id, chg);	693	rsa_cache.gen (pkt->id, chg);
681		694	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
682	if (0 > RSA_public_encrypt (sizeof chg,
683	(unsigned char )&chg, (unsigned char )&pkt->encr,
684	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
685	fatal ("RSA_public_encrypt error");
686		695
687	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	696	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
688		697
689	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	698	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
690		699
…		…
724	}	733	}
725		734
726	void	735	void
727	connection::establish_connection_cb (time_watcher &w)	736	connection::establish_connection_cb (time_watcher &w)
728	{	737	{
729	if (ictx \|\| conf == THISNODE	738	if (!ictx
		739	&& conf != THISNODE
730	\|\| connectmode == conf_node::C_NEVER	740	&& connectmode != conf_node::C_NEVER
731	\|\| connectmode == conf_node::C_DISABLED)	741	&& connectmode != conf_node::C_DISABLED
732	w.at = TSTAMP_CANCEL;	742	&& NOW > w.at)
733	else if (w.at <= NOW)
734	{	743	{
735	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	744	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion
736		745
737	if (retry_int < 3600 * 8)	746	double retry_int = double (retry_cnt & 3
738	retry_cnt++;	747	? (retry_cnt & 3) + 1
739		748	: 1 << (retry_cnt >> 2));
740	w.at = NOW + retry_int;
741		749
742	reset_si ();	750	reset_si ();
		751
		752	bool slow = si.prot & PROT_SLOW;
743		753
744	if (si.prot && !si.host)	754	if (si.prot && !si.host)
745	vpn->send_connect_request (conf->id);	755	vpn->send_connect_request (conf->id);
746	else	756	else
747	{	757	{
748	const sockinfo &dsi = forward_si (si);	758	const sockinfo &dsi = forward_si (si);
		759
		760	slow = slow \|\| (dsi.prot & PROT_SLOW);
749		761
750	if (dsi.valid () && auth_rate_limiter.can (dsi))	762	if (dsi.valid () && auth_rate_limiter.can (dsi))
751	{	763	{
752	if (retry_cnt < 4)	764	if (retry_cnt < 4)
753	send_auth_request (dsi, true);	765	send_auth_request (dsi, true);
754	else	766	else
755	send_ping (dsi, 0);	767	send_ping (dsi, 0);
756	}	768	}
757	}	769	}
		770
		771	retry_int *= slow ? 8. : 0.7;
		772
		773	if (retry_int < conf->max_retry)
		774	retry_cnt++;
		775	else
		776	retry_int = conf->max_retry;
		777
		778	w.start (NOW + retry_int);
758	}	779	}
759	}	780	}
760		781
761	void	782	void
762	connection::reset_connection ()	783	connection::reset_connection ()
…		…
765	{	786	{
766	slog (L_INFO, _("%s(%s): connection lost"),	787	slog (L_INFO, _("%s(%s): connection lost"),
767	conf->nodename, (const char *)si);	788	conf->nodename, (const char *)si);
768		789
769	if (::conf.script_node_down)	790	if (::conf.script_node_down)
770	run_script (run_script_cb (this, &connection::script_node_down), false);	791	if (!run_script (run_script_cb (this, &connection::script_node_down), false))
		792	slog (L_WARN, _("node-down command execution failed, continuing."));
771	}	793	}
772		794
773	delete ictx; ictx = 0;	795	delete ictx; ictx = 0;
774	delete octx; octx = 0;	796	delete octx; octx = 0;
		797	#if ENABLE_DNS
		798	dnsv4_reset_connection ();
		799	#endif
775		800
776	si.host= 0;	801	si.host = 0;
777		802
778	last_activity = 0;	803	last_activity = 0;
779	retry_cnt = 0;	804	retry_cnt = 0;
780		805
781	rekey.reset ();	806	rekey.stop ();
782	keepalive.reset ();	807	keepalive.stop ();
783	establish_connection.reset ();	808	establish_connection.stop ();
784	}	809	}
785		810
786	void	811	void
787	connection::shutdown ()	812	connection::shutdown ()
788	{	813	{
…		…
793	}	818	}
794		819
795	void	820	void
796	connection::rekey_cb (time_watcher &w)	821	connection::rekey_cb (time_watcher &w)
797	{	822	{
798	w.at = TSTAMP_CANCEL;
799
800	reset_connection ();	823	reset_connection ();
801	establish_connection ();	824	establish_connection ();
802	}	825	}
803		826
804	void	827	void
805	connection::send_data_packet (tap_packet *pkt, bool broadcast)	828	connection::send_data_packet (tap_packet *pkt)
806	{	829	{
807	vpndata_packet *p = new vpndata_packet;	830	vpndata_packet *p = new vpndata_packet;
808	int tos = 0;	831	int tos = 0;
809		832
810	// I am not hilarious about peeking into packets, but so be it.	833	// I am not hilarious about peeking into packets, but so be it.
811	if (conf->inherit_tos	834	if (conf->inherit_tos && pkt->is_ipv4 ())
812	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
813	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
814	tos = (*pkt)[15] & IPTOS_TOS_MASK;	835	tos = (*pkt)[15] & IPTOS_TOS_MASK;
815		836
816	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	837	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
817	send_vpn_packet (p, si, tos);	838	send_vpn_packet (p, si, tos);
818		839
819	delete p;	840	delete p;
820		841
821	if (oseqno > MAX_SEQNO)	842	if (oseqno > MAX_SEQNO)
822	rekey ();	843	rekey ();
823	}	844	}
824		845
825	void	846	void
826	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	847	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
827	{	848	{
828	if (ictx && octx)	849	if (ictx && octx)
829	send_data_packet (pkt, broadcast);	850	send_data_packet (pkt);
830	else	851	else
831	{	852	{
832	if (!broadcast)//DDDD	853	if (!broadcast)//DDDD
833	data_queue.put (new tap_packet (*pkt));	854	data_queue.put (new tap_packet (*pkt));
834		855
…		…
840	{	861	{
841	if (ictx && octx)	862	if (ictx && octx)
842	send_vpn_packet (pkt, si, tos);	863	send_vpn_packet (pkt, si, tos);
843	else	864	else
844	{	865	{
845	vpn_queue.put (new vpn_packet (*pkt));	866	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
846		867
847	establish_connection ();	868	establish_connection ();
848	}	869	}
849	}	870	}
850		871
…		…
909	if (p->initiate)	930	if (p->initiate)
910	send_auth_request (rsi, false);	931	send_auth_request (rsi, false);
911		932
912	rsachallenge k;	933	rsachallenge k;
913		934
914	if (0 > RSA_private_decrypt (sizeof (p->encr),	935	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
915	(unsigned char )&p->encr, (unsigned char )&k,	936	{
916	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
917	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	937	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
918	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	938	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		939	break;
		940	}
919	else	941	else
920	{	942	{
921	delete octx;	943	delete octx;
922		944
923	octx = new crypto_ctx (k, 1);	945	octx = new crypto_ctx (k, 1);
924	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	946	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
925		947
926	conf->protocols = p->protocols;	948	conf->protocols = p->protocols;
		949	features = p->features & config_packet::get_features ();
927		950
928	send_auth_response (rsi, p->id, k);	951	send_auth_response (rsi, p->id, k);
929		952
930	connection_established ();	953	connection_established ();
931		954
…		…
967	crypto_ctx *cctx = new crypto_ctx (chg, 0);	990	crypto_ctx *cctx = new crypto_ctx (chg, 0);
968		991
969	if (!p->hmac_chk (cctx))	992	if (!p->hmac_chk (cctx))
970	{	993	{
971	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	994	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
972	"could be an attack, or just corruption or an synchronization error"),	995	"could be an attack, or just corruption or a synchronization error"),
973	conf->nodename, (const char *)rsi);	996	conf->nodename, (const char *)rsi);
974	break;	997	break;
975	}	998	}
976	else	999	else
977	{	1000	{
…		…
995	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),	1018	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
996	conf->nodename, (const char *)rsi,	1019	conf->nodename, (const char *)rsi,
997	p->prot_major, p->prot_minor);	1020	p->prot_major, p->prot_minor);
998		1021
999	if (::conf.script_node_up)	1022	if (::conf.script_node_up)
1000	run_script (run_script_cb (this, &connection::script_node_up), false);	1023	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
		1024	slog (L_WARN, _("node-up command execution failed, continuing."));
1001		1025
1002	break;	1026	break;
1003	}	1027	}
1004	else	1028	else
1005	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1029	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
…		…
1026	{	1050	{
1027	vpndata_packet p = (vpndata_packet )pkt;	1051	vpndata_packet p = (vpndata_packet )pkt;
1028		1052
1029	if (!p->hmac_chk (ictx))	1053	if (!p->hmac_chk (ictx))
1030	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1054	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1031	"could be an attack, or just corruption or an synchronization error"),	1055	"could be an attack, or just corruption or a synchronization error"),
1032	conf->nodename, (const char *)rsi);	1056	conf->nodename, (const char *)rsi);
1033	else	1057	else
1034	{	1058	{
1035	u32 seqno;	1059	u32 seqno;
1036	tap_packet *d = p->unpack (this, seqno);	1060	tap_packet *d = p->unpack (this, seqno);
1037		1061
1038	if (iseqno.recv_ok (seqno))	1062	if (iseqno.recv_ok (seqno))
1039	{	1063	{
1040	vpn->tap->send (d);	1064	vpn->tap->send (d);
1041		1065
1042	if (p->dst () == 0) // re-broadcast
1043	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1044	{
1045	connection c = i;
1046
1047	if (c->conf != THISNODE && c->conf != conf)
1048	c->inject_data_packet (d);
1049	}
1050
1051	if (si != rsi)	1066	if (si != rsi)
1052	{	1067	{
1053	// fast re-sync on connection changes, useful especially for tcp/ip	1068	// fast re-sync on connection changes, useful especially for tcp/ip
1054	si = rsi;	1069	si = rsi;
1055		1070
1056	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),
1057	conf->nodename, (const char )si, (const char )rsi);	1072	conf->nodename, (const char )si, (const char )rsi);
1058	}	1073	}
1059
1060	delete d;
1061
1062	break;
1063	}	1074	}
		1075
		1076	delete d;
		1077	break;
1064	}	1078	}
1065	}	1079	}
1066		1080
1067	send_reset (rsi);	1081	send_reset (rsi);
1068	break;	1082	break;
…		…
1093	break;	1107	break;
1094		1108
1095	case vpn_packet::PT_CONNECT_INFO:	1109	case vpn_packet::PT_CONNECT_INFO:
1096	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1110	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1097	{	1111	{
1098	connect_info_packet p = (connect_info_packet ) pkt;	1112	connect_info_packet p = (connect_info_packet )pkt;
1099		1113
1100	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1114	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything
1101		1115	{
1102	connection *c = vpn->conns[p->id - 1];	1116	connection *c = vpn->conns[p->id - 1];
1103		1117
1104	c->conf->protocols = p->protocols;	1118	c->conf->protocols = p->protocols;
1105	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1119	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1106	p->si.upgrade_protocol (protocol, c->conf);	1120	p->si.upgrade_protocol (protocol, c->conf);
1107		1121
1108	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1122	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1109	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1123	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1110		1124
1111	const sockinfo &dsi = forward_si (p->si);	1125	const sockinfo &dsi = forward_si (p->si);
1112		1126
1113	if (dsi.valid ())	1127	if (dsi.valid ())
1114	c->send_auth_request (dsi, true);	1128	c->send_auth_request (dsi, true);
		1129	}
1115	}	1130	}
1116		1131
1117	break;	1132	break;
1118		1133
1119	default:	1134	default:
…		…
1128	{	1143	{
1129	reset_connection ();	1144	reset_connection ();
1130	establish_connection ();	1145	establish_connection ();
1131	}	1146	}
1132	else if (NOW < last_activity + ::conf.keepalive)	1147	else if (NOW < last_activity + ::conf.keepalive)
1133	w.at = last_activity + ::conf.keepalive;	1148	w.start (last_activity + ::conf.keepalive);
1134	else if (conf->connectmode != conf_node::C_ONDEMAND	1149	else if (conf->connectmode != conf_node::C_ONDEMAND
1135	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1150	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1136	{	1151	{
1137	send_ping (si);	1152	send_ping (si);
1138	w.at = NOW + 5;	1153	w.start (NOW + 5);
1139	}	1154	}
1140	else if (NOW < last_activity + ::conf.keepalive + 10)	1155	else if (NOW < last_activity + ::conf.keepalive + 10)
1141	// hold ondemand connections implicitly a few seconds longer	1156	// hold ondemand connections implicitly a few seconds longer
1142	// should delete octx, though, or something like that ;)	1157	// should delete octx, though, or something like that ;)
1143	w.at = last_activity + ::conf.keepalive + 10;	1158	w.start (last_activity + ::conf.keepalive + 10);
1144	else	1159	else
1145	reset_connection ();	1160	reset_connection ();
1146	}	1161	}
1147		1162
1148	void connection::send_connect_request (int id)	1163	void connection::send_connect_request (int id)
…		…
1154	send_vpn_packet (p, si);	1169	send_vpn_packet (p, si);
1155		1170
1156	delete p;	1171	delete p;
1157	}	1172	}
1158		1173
		1174	void connection::script_init_env (const char *ext)
		1175	{
		1176	char *env;
		1177	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1178	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1179	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1180	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1181	conf->id & 0xff); putenv (env);
		1182	}
		1183
1159	void connection::script_node ()	1184	void connection::script_init_connect_env ()
1160	{	1185	{
1161	vpn->script_if_up ();	1186	vpn->script_init_env ();
1162		1187
1163	char *env;	1188	char *env;
1164	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1189	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1165	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1190	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1166	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1191	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1167	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1192	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1168	}	1193	}
1169		1194
1170	const char *connection::script_node_up ()	1195	const char *connection::script_node_up ()
1171	{	1196	{
1172	script_node ();	1197	script_init_connect_env ();
1173		1198
1174	putenv ("STATE=up");	1199	putenv ("STATE=up");
1175		1200
		1201	char *filename;
		1202	asprintf (&filename,
		1203	"%s/%s",
		1204	confbase,
1176	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1205	::conf.script_node_up ? ::conf.script_node_up : "node-up");
		1206
		1207	return filename;
1177	}	1208	}
1178		1209
1179	const char *connection::script_node_down ()	1210	const char *connection::script_node_down ()
1180	{	1211	{
1181	script_node ();	1212	script_init_connect_env ();
1182		1213
1183	putenv ("STATE=down");	1214	putenv ("STATE=down");
1184		1215
1185	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1216	char *filename;
1186	}	1217	asprintf (&filename,
		1218	"%s/%s",
		1219	confbase,
		1220	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1187		1221
		1222	return filename;
		1223	}
		1224
1188	connection::connection(struct vpn *vpn_)	1225	connection::connection (struct vpn vpn, conf_node conf)
1189	: vpn(vpn_)	1226	: vpn(vpn), conf(conf)
1190	, rekey (this, &connection::rekey_cb)	1227	, rekey (this, &connection::rekey_cb)
1191	, keepalive (this, &connection::keepalive_cb)	1228	, keepalive (this, &connection::keepalive_cb)
1192	, establish_connection (this, &connection::establish_connection_cb)	1229	, establish_connection (this, &connection::establish_connection_cb)
		1230	#if ENABLE_DNS
		1231	, dns (0)
		1232	#endif
1193	{	1233	{
1194	octx = ictx = 0;	1234	octx = ictx = 0;
1195	retry_cnt = 0;	1235	retry_cnt = 0;
1196		1236
		1237	if (!conf->protocols) // make sure some protocol is enabled
		1238	conf->protocols = PROT_UDPv4;
		1239
1197	connectmode = conf_node::C_ALWAYS; // initial setting	1240	connectmode = conf_node::C_ALWAYS; // initial setting
1198	reset_connection ();	1241	reset_connection ();
1199	}	1242	}
1200		1243
1201	connection::~connection ()	1244	connection::~connection ()

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Comparing gvpe/src/connection.C (file contents): Revision 1.20 by pcg, Tue Oct 14 15:48:15 2003 UTC vs. Revision 1.55 by pcg, Tue Apr 26 00:55:56 2005 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.20 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.55 by pcg, Tue Apr 26 00:55:56 2005 UTC