summaryrefslogtreecommitdiff
path: root/source4/lib/time.c
blob: 3bc97dddc927eac2a9b7eeb67f061d1fd5d5f82e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/* 
   Unix SMB/CIFS implementation.
   time handling functions

   Copyright (C) Andrew Tridgell 		1992-2004
   Copyright (C) Stefan (metze) Metzmacher	2002   

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "system/time.h"

#ifndef TIME_T_MIN
#define TIME_T_MIN 0
#endif
#ifndef TIME_T_MAX
#define TIME_T_MAX (~(time_t)0)
#endif

/*******************************************************************
 External access to time_t_min and time_t_max.
********************************************************************/
time_t get_time_t_max(void)
{
	return TIME_T_MAX;
}

/*******************************************************************
a gettimeofday wrapper
********************************************************************/
void GetTimeOfDay(struct timeval *tval)
{
#ifdef HAVE_GETTIMEOFDAY_TZ
	gettimeofday(tval,NULL);
#else
	gettimeofday(tval);
#endif
}


#define TIME_FIXUP_CONSTANT 11644473600LL

/****************************************************************************
interpret an 8 byte "filetime" structure to a time_t
It's originally in "100ns units since jan 1st 1601"
****************************************************************************/
time_t nt_time_to_unix(NTTIME nt)
{
	if (nt == 0) {
		return 0;
	}
	if (nt == -1LL) {
		return (time_t)-1;
	}
	nt += 1000*1000*10/2;
	nt /= 1000*1000*10;
	nt -= TIME_FIXUP_CONSTANT;

	if (TIME_T_MIN >= nt || nt >= TIME_T_MAX) {
		return 0;
	}

	return (time_t)nt;
}


/****************************************************************************
put a 8 byte filetime from a time_t
This takes GMT as input
****************************************************************************/
void unix_to_nt_time(NTTIME *nt, time_t t)
{
	uint64_t t2; 

	if (t == (time_t)-1) {
		*nt = (NTTIME)-1LL;
		return;
	}		
	if (t == 0) {
		*nt = 0;
		return;
	}		

	t2 = t;
	t2 += TIME_FIXUP_CONSTANT;
	t2 *= 1000*1000*10;

	*nt = t2;
}


/****************************************************************************
check if it's a null unix time
****************************************************************************/
BOOL null_time(time_t t)
{
	return t == 0 || 
		t == (time_t)0xFFFFFFFF || 
		t == (time_t)-1;
}


/****************************************************************************
check if it's a null NTTIME
****************************************************************************/
BOOL null_nttime(NTTIME t)
{
	return t == 0 || t == (NTTIME)-1;
}

/*******************************************************************
  create a 16 bit dos packed date
********************************************************************/
static uint16_t make_dos_date1(struct tm *t)
{
	uint16_t ret=0;
	ret = (((uint_t)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
	ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
	return ret;
}

/*******************************************************************
  create a 16 bit dos packed time
********************************************************************/
static uint16_t make_dos_time1(struct tm *t)
{
	uint16_t ret=0;
	ret = ((((uint_t)t->tm_min >> 3)&0x7) | (((uint_t)t->tm_hour) << 3));
	ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
	return ret;
}

/*******************************************************************
  create a 32 bit dos packed date/time from some parameters
  This takes a GMT time and returns a packed localtime structure
********************************************************************/
static uint32_t make_dos_date(time_t unixdate, int zone_offset)
{
	struct tm *t;
	uint32_t ret=0;

	if (unixdate == 0) {
		return 0;
	}

	unixdate -= zone_offset;

	t = gmtime(&unixdate);
	if (!t) {
		return 0xFFFFFFFF;
	}

	ret = make_dos_date1(t);
	ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);

	return ret;
}

/*******************************************************************
put a dos date into a buffer (time/date format)
This takes GMT time and puts local time in the buffer
********************************************************************/
void push_dos_date(uint8_t *buf, int offset, time_t unixdate, int zone_offset)
{
	uint32_t x = make_dos_date(unixdate, zone_offset);
	SIVAL(buf,offset,x);
}

/*******************************************************************
put a dos date into a buffer (date/time format)
This takes GMT time and puts local time in the buffer
********************************************************************/
void push_dos_date2(uint8_t *buf,int offset,time_t unixdate, int zone_offset)
{
	uint32_t x;
	x = make_dos_date(unixdate, zone_offset);
	x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
	SIVAL(buf,offset,x);
}

/*******************************************************************
put a dos 32 bit "unix like" date into a buffer. This routine takes
GMT and converts it to LOCAL time before putting it (most SMBs assume
localtime for this sort of date)
********************************************************************/
void push_dos_date3(uint8_t *buf,int offset,time_t unixdate, int zone_offset)
{
	if (!null_time(unixdate)) {
		unixdate -= zone_offset;
	}
	SIVAL(buf,offset,unixdate);
}

/*******************************************************************
  interpret a 32 bit dos packed date/time to some parameters
********************************************************************/
static void interpret_dos_date(uint32_t date,int *year,int *month,int *day,int *hour,int *minute,int *second)
{
	uint32_t p0,p1,p2,p3;

	p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF; 
	p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;

	*second = 2*(p0 & 0x1F);
	*minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
	*hour = (p1>>3)&0xFF;
	*day = (p2&0x1F);
	*month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
	*year = ((p3>>1)&0xFF) + 80;
}

/*******************************************************************
  create a unix date (int GMT) from a dos date (which is actually in
  localtime)
********************************************************************/
time_t pull_dos_date(const uint8_t *date_ptr, int zone_offset)
{
	uint32_t dos_date=0;
	struct tm t;
	time_t ret;

	dos_date = IVAL(date_ptr,0);

	if (dos_date == 0) return (time_t)0;
  
	interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
			   &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
	t.tm_isdst = -1;
  
	ret = timegm(&t);

	ret += zone_offset;

	return ret;
}

/*******************************************************************
like make_unix_date() but the words are reversed
********************************************************************/
time_t pull_dos_date2(const uint8_t *date_ptr, int zone_offset)
{
	uint32_t x,x2;

	x = IVAL(date_ptr,0);
	x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
	SIVAL(&x,0,x2);

	return pull_dos_date((void *)&x, zone_offset);
}

/*******************************************************************
  create a unix GMT date from a dos date in 32 bit "unix like" format
  these generally arrive as localtimes, with corresponding DST
  ******************************************************************/
time_t pull_dos_date3(const uint8_t *date_ptr, int zone_offset)
{
	time_t t = (time_t)IVAL(date_ptr,0);
	if (!null_time(t)) {
		t += zone_offset;
	}
	return t;
}


/***************************************************************************
return a HTTP/1.0 time string
  ***************************************************************************/
char *http_timestring(TALLOC_CTX *mem_ctx, time_t t)
{
	char *buf;
	char tempTime[60];
	struct tm *tm = localtime(&t);

	if (!tm) {
		return talloc_asprintf(mem_ctx,"%ld seconds since the Epoch",(long)t);
	}

#ifndef HAVE_STRFTIME
	buf = talloc_strdup(mem_ctx, asctime(tm));
	if (buf[strlen(buf)-1] == '\n') {
		buf[strlen(buf)-1] = 0;
	}
#else
	strftime(tempTime, sizeof(tempTime)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
	buf = talloc_strdup(mem_ctx, tempTime);
#endif /* !HAVE_STRFTIME */

	return buf;
}

/*
  return a LDAP time string
*/
char *ldap_timestring(TALLOC_CTX *mem_ctx, time_t t)
{
	struct tm *tm = gmtime(&t);

	if (!tm) {
		return NULL;
	}

	/* formatted like: 20040408072012.0Z */
	return talloc_asprintf(mem_ctx, 
			       "%04u%02u%02u%02u%02u%02u.0Z",
			       tm->tm_year+1900, tm->tm_mon+1,
			       tm->tm_mday, tm->tm_hour, tm->tm_min,
			       tm->tm_sec);
}


/*
  convert a LDAP time string to a time_t. Return 0 if unable to convert
*/
time_t ldap_string_to_time(const char *s)
{
	struct tm tm;
	
	if (s == NULL) return 0;
	
	ZERO_STRUCT(tm);
	if (sscanf(s, "%04u%02u%02u%02u%02u%02u.0Z", 
		   &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 
		   &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
		return 0;
	}
	tm.tm_year -= 1900;
	tm.tm_mon -= 1;
	
	return timegm(&tm);
}

/****************************************************************************
 Return the date and time as a string
****************************************************************************/
char *timestring(TALLOC_CTX *mem_ctx, time_t t)
{
	char *TimeBuf;
	char tempTime[80];
	struct tm *tm;

	tm = localtime(&t);
	if (!tm) {
		return talloc_asprintf(mem_ctx,
				       "%ld seconds since the Epoch",
				       (long)t);
	}

#ifdef HAVE_STRFTIME
	/* some versions of gcc complain about using %c. This is a bug
	   in the gcc warning, not a bug in this code. See a recent
	   strftime() manual page for details.
	 */
	strftime(tempTime,sizeof(tempTime)-1,"%c %Z",tm);
	TimeBuf = talloc_strdup(mem_ctx, tempTime);
#else
	TimeBuf = talloc_strdup(mem_ctx, asctime(tm));
#endif

	return TimeBuf;
}

/*
  return a talloced string representing a NTTIME for human consumption
*/
const char *nt_time_string(TALLOC_CTX *mem_ctx, NTTIME nt)
{
	time_t t;
	if (nt == 0) {
		return "NTTIME(0)";
	}
	t = nt_time_to_unix(nt);
	return timestring(mem_ctx, t);
}


/*
  put a NTTIME into a packet
*/
void push_nttime(uint8_t *base, uint16_t offset, NTTIME t)
{
	SBVAL(base, offset,   t);
}

/*
  pull a NTTIME from a packet
*/
NTTIME pull_nttime(uint8_t *base, uint16_t offset)
{
	NTTIME ret = BVAL(base, offset);
	return ret;
}

/*
  parse a nttime as a large integer in a string and return a NTTIME
*/
NTTIME nttime_from_string(const char *s)
{
	return strtoull(s, NULL, 0);
}

/*
  return (tv1 - tv2) in microseconds
*/
int64_t usec_time_diff(struct timeval *tv1, struct timeval *tv2)
{
	int64_t sec_diff = tv1->tv_sec - tv2->tv_sec;
	return (sec_diff * 1000000) + (int64_t)(tv1->tv_usec - tv2->tv_usec);
}


/*
  return a zero timeval
*/
struct timeval timeval_zero(void)
{
	struct timeval tv;
	tv.tv_sec = 0;
	tv.tv_usec = 0;
	return tv;
}

/*
  return True if a timeval is zero
*/
BOOL timeval_is_zero(const struct timeval *tv)
{
	return tv->tv_sec == 0 && tv->tv_usec == 0;
}

/*
  return a timeval for the current time
*/
struct timeval timeval_current(void)
{
	struct timeval tv;
	GetTimeOfDay(&tv);
	return tv;
}

/*
  return a timeval struct with the given elements
*/
struct timeval timeval_set(uint32_t secs, uint32_t usecs)
{
	struct timeval tv;
	tv.tv_sec = secs;
	tv.tv_usec = usecs;
	return tv;
}


/*
  return a timeval ofs microseconds after tv
*/
struct timeval timeval_add(const struct timeval *tv,
			   uint32_t secs, uint32_t usecs)
{
	struct timeval tv2 = *tv;
	const uint_t million = 1000000;
	tv2.tv_sec += secs;
	tv2.tv_usec += usecs;
	tv2.tv_sec += tv2.tv_usec / million;
	tv2.tv_usec = tv2.tv_usec % million;
	return tv2;
}

/*
  return the sum of two timeval structures
*/
struct timeval timeval_sum(const struct timeval *tv1,
			   const struct timeval *tv2)
{
	return timeval_add(tv1, tv2->tv_sec, tv2->tv_usec);
}

/*
  return a timeval secs/usecs into the future
*/
struct timeval timeval_current_ofs(uint32_t secs, uint32_t usecs)
{
	struct timeval tv = timeval_current();
	return timeval_add(&tv, secs, usecs);
}

/*
  compare two timeval structures. 
  Return 1 if tv2 > tv1
  Return 0 if tv2 == tv1
  Return -1 if tv2 < tv1
*/
int timeval_compare(const struct timeval *tv1, const struct timeval *tv2)
{
	if (tv2->tv_sec  > tv1->tv_sec)  return 1;
	if (tv2->tv_sec  < tv1->tv_sec)  return -1;
	if (tv2->tv_usec > tv1->tv_usec) return 1;
	if (tv2->tv_usec < tv1->tv_usec) return -1;
	return 0;
}

/*
  return True if a timer is in the past
*/
BOOL timeval_expired(const struct timeval *tv)
{
	struct timeval tv2 = timeval_current();
	if (tv2.tv_sec > tv->tv_sec) return True;
	if (tv2.tv_sec < tv->tv_sec) return False;
	return (tv2.tv_usec >= tv->tv_usec);
}

/*
  return the number of seconds elapsed between two times
*/
double timeval_elapsed2(const struct timeval *tv1, const struct timeval *tv2)
{
	return (tv2->tv_sec - tv1->tv_sec) + 
	       (tv2->tv_usec - tv1->tv_usec)*1.0e-6;
}

/*
  return the number of seconds elapsed since a given time
*/
double timeval_elapsed(const struct timeval *tv)
{
	struct timeval tv2 = timeval_current();
	return timeval_elapsed2(tv, &tv2);
}

/*
  return the lesser of two timevals
*/
struct timeval timeval_min(const struct timeval *tv1,
			   const struct timeval *tv2)
{
	if (tv1->tv_sec < tv2->tv_sec) return *tv1;
	if (tv1->tv_sec > tv2->tv_sec) return *tv2;
	if (tv1->tv_usec < tv2->tv_usec) return *tv1;
	return *tv2;
}

/*
  return the greater of two timevals
*/
struct timeval timeval_max(const struct timeval *tv1,
			   const struct timeval *tv2)
{
	if (tv1->tv_sec > tv2->tv_sec) return *tv1;
	if (tv1->tv_sec < tv2->tv_sec) return *tv2;
	if (tv1->tv_usec > tv2->tv_usec) return *tv1;
	return *tv2;
}

/*
  return the difference between two timevals as a timeval
  if tv1 comes after tv2, then return a zero timeval
  (this is *tv2 - *tv1)
*/
struct timeval timeval_until(const struct timeval *tv1,
			     const struct timeval *tv2)
{
	struct timeval t;
	if (timeval_compare(tv2, tv1) >= 0) {
		return timeval_zero();
	}
	t.tv_sec = tv2->tv_sec - tv1->tv_sec;
	if (tv1->tv_usec > tv2->tv_usec) {
		t.tv_sec--;
		t.tv_usec = 1000000 - (tv1->tv_usec - tv2->tv_usec);
	} else {
		t.tv_usec = tv2->tv_usec - tv1->tv_usec;
	}
	return t;
}


/*
  convert a timeval to a NTTIME
*/
NTTIME timeval_to_nttime(const struct timeval *tv)
{
	return 10*(tv->tv_usec + 
		  ((TIME_FIXUP_CONSTANT + (uint64_t)tv->tv_sec) * 1000000));
}