summaryrefslogtreecommitdiff
path: root/lib/util/time.c
blob: ed3b4f8e301c7c09021ce677cd3fe5395ba48baa (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
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
/* 
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

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

/**
 * @file
 * @brief time handling functions
 */

#if (SIZEOF_LONG == 8)
#define TIME_FIXUP_CONSTANT_INT 11644473600L
#elif (SIZEOF_LONG_LONG == 8)
#define TIME_FIXUP_CONSTANT_INT 11644473600LL
#endif



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

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

/**
a wrapper to preferably get the monotonic time
**/
_PUBLIC_ void clock_gettime_mono(struct timespec *tp)
{
	if (clock_gettime(CUSTOM_CLOCK_MONOTONIC,tp) != 0) {
		clock_gettime(CLOCK_REALTIME,tp);
	}
}

/**
a wrapper to preferably get the monotonic time in seconds
as this is only second resolution we can use the cached
(and much faster) COARS clock variant
**/
_PUBLIC_ time_t time_mono(time_t *t)
{
	struct timespec tp;
	int rc = -1;
#ifdef CLOCK_MONOTONIC_COARSE
	rc = clock_gettime(CLOCK_MONOTONIC_COARSE,&tp);
#endif
	if (rc != 0) {
		clock_gettime_mono(&tp);
	}
	if (t != NULL) {
		*t = tp.tv_sec;
	}
	return tp.tv_sec;
}


#define TIME_FIXUP_CONSTANT 11644473600LL

time_t convert_timespec_to_time_t(struct timespec ts)
{
	/* 1 ns == 1,000,000,000 - one thousand millionths of a second.
	   increment if it's greater than 500 millionth of a second. */
	if (ts.tv_nsec > 500000000) {
		return ts.tv_sec + 1;
	}
	return ts.tv_sec;
}

struct timespec convert_time_t_to_timespec(time_t t)
{
	struct timespec ts;
	ts.tv_sec = t;
	ts.tv_nsec = 0;
	return ts;
}



/**
 Interpret an 8 byte "filetime" structure to a time_t
 It's originally in "100ns units since jan 1st 1601"

 An 8 byte value of 0xffffffffffffffff will be returned as a timespec of

	tv_sec = 0
	tv_nsec = 0;

 Returns GMT.
**/
time_t nt_time_to_unix(NTTIME nt)
{
	return convert_timespec_to_time_t(nt_time_to_unix_timespec(&nt));
}


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

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

	if (t == TIME_T_MAX) {
		*nt = 0x7fffffffffffffffLL;
		return;
	}

	if (t == 0) {
		*nt = 0;
		return;
	}		

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

	*nt = t2;
}


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


/**
check if it's a null NTTIME
**/
_PUBLIC_ 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 = (((unsigned int)(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 = ((((unsigned int)t->tm_min >> 3)&0x7) | (((unsigned int)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
**/
_PUBLIC_ 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
**/
_PUBLIC_ 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)
**/
_PUBLIC_ 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
********************************************************************/
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)
**/
_PUBLIC_ 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
**/
_PUBLIC_ 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((const uint8_t *)&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
**/
_PUBLIC_ 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
**/
_PUBLIC_ char *http_timestring(TALLOC_CTX *mem_ctx, time_t t)
{
	char *buf;
	char tempTime[60];
	struct tm *tm = localtime(&t);

	if (t == TIME_T_MAX) {
		return talloc_strdup(mem_ctx, "never");
	}

	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 the date and time as a string
**/
_PUBLIC_ 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
*/
_PUBLIC_ 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
*/
_PUBLIC_ void push_nttime(uint8_t *base, uint16_t offset, NTTIME t)
{
	SBVAL(base, offset,   t);
}

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

/**
  return (tv1 - tv2) in microseconds
*/
_PUBLIC_ int64_t usec_time_diff(const struct timeval *tv1, const 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 (tp1 - tp2) in microseconds
*/
_PUBLIC_ int64_t nsec_time_diff(const struct timespec *tp1, const struct timespec *tp2)
{
	int64_t sec_diff = tp1->tv_sec - tp2->tv_sec;
	return (sec_diff * 1000000000) + (int64_t)(tp1->tv_nsec - tp2->tv_nsec);
}


/**
  return a zero timeval
*/
_PUBLIC_ 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
*/
_PUBLIC_ bool timeval_is_zero(const struct timeval *tv)
{
	return tv->tv_sec == 0 && tv->tv_usec == 0;
}

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

/**
  return a timeval struct with the given elements
*/
_PUBLIC_ 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
*/
_PUBLIC_ struct timeval timeval_add(const struct timeval *tv,
			   uint32_t secs, uint32_t usecs)
{
	struct timeval tv2 = *tv;
	const unsigned int 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
*/
_PUBLIC_ 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 tv1 < tv2
  Return 0 if tv1 == tv2
  Return 1 if tv1 > tv2
*/
_PUBLIC_ int timeval_compare(const struct timeval *tv1, const struct timeval *tv2)
{
	if (tv1->tv_sec  > tv2->tv_sec)  return 1;
	if (tv1->tv_sec  < tv2->tv_sec)  return -1;
	if (tv1->tv_usec > tv2->tv_usec) return 1;
	if (tv1->tv_usec < tv2->tv_usec) return -1;
	return 0;
}

/**
  return true if a timer is in the past
*/
_PUBLIC_ 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
*/
_PUBLIC_ 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
*/
_PUBLIC_ double timeval_elapsed(const struct timeval *tv)
{
	struct timeval tv2 = timeval_current();
	return timeval_elapsed2(tv, &tv2);
}

/**
  return the lesser of two timevals
*/
_PUBLIC_ 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
*/
_PUBLIC_ 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)
*/
_PUBLIC_ struct timeval timeval_until(const struct timeval *tv1,
			     const struct timeval *tv2)
{
	struct timeval t;
	if (timeval_compare(tv1, tv2) >= 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
*/
_PUBLIC_ NTTIME timeval_to_nttime(const struct timeval *tv)
{
	return 10*(tv->tv_usec + 
		  ((TIME_FIXUP_CONSTANT + (uint64_t)tv->tv_sec) * 1000000));
}

/**
  convert a NTTIME to a timeval
*/
_PUBLIC_ void nttime_to_timeval(struct timeval *tv, NTTIME t)
{
	if (tv == NULL) return;

	t += 10/2;
	t /= 10;
	t -= TIME_FIXUP_CONSTANT*1000*1000;

	tv->tv_sec  = t / 1000000;

	if (TIME_T_MIN > tv->tv_sec || tv->tv_sec > TIME_T_MAX) {
		tv->tv_sec  = 0;
		tv->tv_usec = 0;
		return;
	}
	
	tv->tv_usec = t - tv->tv_sec*1000000;
}

/*******************************************************************
yield the difference between *A and *B, in seconds, ignoring leap seconds
********************************************************************/
static int tm_diff(struct tm *a, struct tm *b)
{
	int ay = a->tm_year + (1900 - 1);
	int by = b->tm_year + (1900 - 1);
	int intervening_leap_days =
		(ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
	int years = ay - by;
	int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
	int hours = 24*days + (a->tm_hour - b->tm_hour);
	int minutes = 60*hours + (a->tm_min - b->tm_min);
	int seconds = 60*minutes + (a->tm_sec - b->tm_sec);

	return seconds;
}


int extra_time_offset=0;

/**
  return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
 */
_PUBLIC_ int get_time_zone(time_t t)
{
	struct tm *tm = gmtime(&t);
	struct tm tm_utc;
	if (!tm)
		return 0;
	tm_utc = *tm;
	tm = localtime(&t);
	if (!tm)
		return 0;
	return tm_diff(&tm_utc,tm)+60*extra_time_offset;
}

struct timespec nt_time_to_unix_timespec(NTTIME *nt)
{
	int64_t d;
	struct timespec ret;

	if (*nt == 0 || *nt == (int64_t)-1) {
		ret.tv_sec = 0;
		ret.tv_nsec = 0;
		return ret;
	}

	d = (int64_t)*nt;
	/* d is now in 100ns units, since jan 1st 1601".
	   Save off the ns fraction. */

	/*
	 * Take the last seven decimal digits and multiply by 100.
	 * to convert from 100ns units to 1ns units.
	 */
        ret.tv_nsec = (long) ((d % (1000 * 1000 * 10)) * 100);

	/* Convert to seconds */
	d /= 1000*1000*10;

	/* Now adjust by 369 years to make the secs since 1970 */
	d -= TIME_FIXUP_CONSTANT_INT;

	if (d <= (int64_t)TIME_T_MIN) {
		ret.tv_sec = TIME_T_MIN;
		ret.tv_nsec = 0;
		return ret;
	}

	if (d >= (int64_t)TIME_T_MAX) {
		ret.tv_sec = TIME_T_MAX;
		ret.tv_nsec = 0;
		return ret;
	}

	ret.tv_sec = (time_t)d;
	return ret;
}


/**
  check if 2 NTTIMEs are equal.
*/
bool nt_time_equal(NTTIME *t1, NTTIME *t2)
{
	return *t1 == *t2;
}

/**
 Check if it's a null timespec.
**/

bool null_timespec(struct timespec ts)
{
	return ts.tv_sec == 0 || 
		ts.tv_sec == (time_t)0xFFFFFFFF || 
		ts.tv_sec == (time_t)-1;
}