source3/lib/time.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    time handling functions
   4
   5    Copyright (C) Andrew Tridgell                1992-2004
   6    Copyright (C) Stefan (metze) Metzmacher      2002
   7    Copyright (C) Jeremy Allison                 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 /**
  26  * @file
  27  * @brief time handling functions
  28  */
  29
  30
  31 #define NTTIME_INFINITY (NTTIME)0x8000000000000000LL
  32
  33 #if (SIZEOF_LONG == 8)
  34 #define TIME_FIXUP_CONSTANT_INT 11644473600L
  35 #elif (SIZEOF_LONG_LONG == 8)
  36 #define TIME_FIXUP_CONSTANT_INT 11644473600LL
  37 #endif
  38
  39
  40 /**
  41   parse a nttime as a large integer in a string and return a NTTIME
  42 */
  43 NTTIME nttime_from_string(const char *s)
  44 {
  45         return strtoull(s, NULL, 0);
  46 }
  47
  48 /**************************************************************
  49  Handle conversions between time_t and uint32, taking care to
  50  preserve the "special" values.
  51 **************************************************************/
  52
  53 uint32_t convert_time_t_to_uint32_t(time_t t)
  54 {
  55 #if (defined(SIZEOF_TIME_T) && (SIZEOF_TIME_T == 8))
  56         /* time_t is 64-bit. */
  57         if (t == 0x8000000000000000LL) {
  58                 return 0x80000000;
  59         } else if (t == 0x7FFFFFFFFFFFFFFFLL) {
  60                 return 0x7FFFFFFF;
  61         }
  62 #endif
  63         return (uint32_t)t;
  64 }
  65
  66 time_t convert_uint32_t_to_time_t(uint32_t u)
  67 {
  68 #if (defined(SIZEOF_TIME_T) && (SIZEOF_TIME_T == 8))
  69         /* time_t is 64-bit. */
  70         if (u == 0x80000000) {
  71                 return (time_t)0x8000000000000000LL;
  72         } else if (u == 0x7FFFFFFF) {
  73                 return (time_t)0x7FFFFFFFFFFFFFFFLL;
  74         }
  75 #endif
  76         return (time_t)u;
  77 }
  78
  79 /****************************************************************************
  80  Check if NTTIME is 0.
  81 ****************************************************************************/
  82
  83 bool nt_time_is_zero(const NTTIME *nt)
  84 {
  85         return (*nt == 0);
  86 }
  87
  88 /****************************************************************************
  89  Convert ASN.1 GeneralizedTime string to unix-time.
  90  Returns 0 on failure; Currently ignores timezone.
  91 ****************************************************************************/
  92
  93 time_t generalized_to_unix_time(const char *str)
  94 {
  95         struct tm tm;
  96
  97         ZERO_STRUCT(tm);
  98
  99         if (sscanf(str, "%4d%2d%2d%2d%2d%2d",
 100                    &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
 101                    &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
 102                 return 0;
 103         }
 104         tm.tm_year -= 1900;
 105         tm.tm_mon -= 1;
 106
 107         return timegm(&tm);
 108 }
 109
 110 /*******************************************************************
 111  Accessor function for the server time zone offset.
 112  set_server_zone_offset() must have been called first.
 113 ******************************************************************/
 114
 115 static int server_zone_offset;
 116
 117 int get_server_zone_offset(void)
 118 {
 119         return server_zone_offset;
 120 }
 121
 122 /*******************************************************************
 123  Initialize the server time zone offset. Called when a client connects.
 124 ******************************************************************/
 125
 126 int set_server_zone_offset(time_t t)
 127 {
 128         server_zone_offset = get_time_zone(t);
 129         return server_zone_offset;
 130 }
 131
 132 /***************************************************************************
 133  Server versions of the above functions.
 134 ***************************************************************************/
 135
 136 void srv_put_dos_date(char *buf,int offset,time_t unixdate)
 137 {
 138         push_dos_date((uint8_t *)buf, offset, unixdate, server_zone_offset);
 139 }
 140
 141 void srv_put_dos_date2(char *buf,int offset, time_t unixdate)
 142 {
 143         push_dos_date2((uint8_t *)buf, offset, unixdate, server_zone_offset);
 144 }
 145
 146 void srv_put_dos_date3(char *buf,int offset,time_t unixdate)
 147 {
 148         push_dos_date3((uint8_t *)buf, offset, unixdate, server_zone_offset);
 149 }
 150
 151 void round_timespec(enum timestamp_set_resolution res, struct timespec *ts)
 152 {
 153         switch (res) {
 154                 case TIMESTAMP_SET_SECONDS:
 155                         round_timespec_to_sec(ts);
 156                         break;
 157                 case TIMESTAMP_SET_MSEC:
 158                         round_timespec_to_usec(ts);
 159                         break;
 160                 case TIMESTAMP_SET_NT_OR_BETTER:
 161                         /* No rounding needed. */
 162                         break;
 163         }
 164 }
 165
 166 /****************************************************************************
 167  Take a Unix time and convert to an NTTIME structure and place in buffer
 168  pointed to by p, rounded to the correct resolution.
 169 ****************************************************************************/
 170
 171 void put_long_date_timespec(enum timestamp_set_resolution res, char *p, struct timespec ts)
 172 {
 173         NTTIME nt;
 174         round_timespec(res, &ts);
 175         unix_timespec_to_nt_time(&nt, ts);
 176         SIVAL(p, 0, nt & 0xFFFFFFFF);
 177         SIVAL(p, 4, nt >> 32);
 178 }
 179
 180 void put_long_date(char *p, time_t t)
 181 {
 182         struct timespec ts;
 183         ts.tv_sec = t;
 184         ts.tv_nsec = 0;
 185         put_long_date_timespec(TIMESTAMP_SET_SECONDS, p, ts);
 186 }
 187
 188 void dos_filetime_timespec(struct timespec *tsp)
 189 {
 190         tsp->tv_sec &= ~1;
 191         tsp->tv_nsec = 0;
 192 }
 193
 194 /*******************************************************************
 195  Create a unix date (int GMT) from a dos date (which is actually in
 196  localtime).
 197 ********************************************************************/
 198
 199 time_t make_unix_date(const void *date_ptr, int zone_offset)
 200 {
 201         uint32_t dos_date=0;
 202         struct tm t;
 203         time_t ret;
 204
 205         dos_date = IVAL(date_ptr,0);
 206
 207         if (dos_date == 0) {
 208                 return 0;
 209         }
 210
 211         interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
 212                         &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
 213         t.tm_isdst = -1;
 214
 215         ret = timegm(&t);
 216
 217         ret += zone_offset;
 218
 219         return(ret);
 220 }
 221
 222 /*******************************************************************
 223  Like make_unix_date() but the words are reversed.
 224 ********************************************************************/
 225
 226 time_t make_unix_date2(const void *date_ptr, int zone_offset)
 227 {
 228         uint32_t x,x2;
 229
 230         x = IVAL(date_ptr,0);
 231         x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 232         SIVAL(&x,0,x2);
 233
 234         return(make_unix_date((const void *)&x, zone_offset));
 235 }
 236
 237 /*******************************************************************
 238  Create a unix GMT date from a dos date in 32 bit "unix like" format
 239  these generally arrive as localtimes, with corresponding DST.
 240 ******************************************************************/
 241
 242 time_t make_unix_date3(const void *date_ptr, int zone_offset)
 243 {
 244         time_t t = (time_t)IVAL(date_ptr,0);
 245         if (!null_time(t)) {
 246                 t += zone_offset;
 247         }
 248         return(t);
 249 }
 250
 251 time_t srv_make_unix_date(const void *date_ptr)
 252 {
 253         return make_unix_date(date_ptr, server_zone_offset);
 254 }
 255
 256 time_t srv_make_unix_date2(const void *date_ptr)
 257 {
 258         return make_unix_date2(date_ptr, server_zone_offset);
 259 }
 260
 261 time_t srv_make_unix_date3(const void *date_ptr)
 262 {
 263         return make_unix_date3(date_ptr, server_zone_offset);
 264 }
 265
 266 /****************************************************************************
 267  Interprets an nt time into a unix struct timespec.
 268  Differs from nt_time_to_unix in that an 8 byte value of 0xffffffffffffffff
 269  will be returned as (time_t)-1, whereas nt_time_to_unix returns 0 in this case.
 270 ****************************************************************************/
 271
 272 struct timespec interpret_long_date(const char *p)
 273 {
 274         NTTIME nt;
 275         nt = IVAL(p,0) + ((uint64_t)IVAL(p,4) << 32);
 276         if (nt == (uint64_t)-1) {
 277                 struct timespec ret;
 278                 ret.tv_sec = (time_t)-1;
 279                 ret.tv_nsec = 0;
 280                 return ret;
 281         }
 282         return nt_time_to_unix_timespec(&nt);
 283 }
 284
 285 /*******************************************************************
 286  Re-read the smb serverzone value.
 287 ******************************************************************/
 288
 289 static struct timeval start_time_hires;
 290
 291 void TimeInit(void)
 292 {
 293         set_server_zone_offset(time(NULL));
 294
 295         DEBUG(4,("TimeInit: Serverzone is %d\n", server_zone_offset));
 296
 297         /* Save the start time of this process. */
 298         if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0) {
 299                 GetTimeOfDay(&start_time_hires);
 300         }
 301 }
 302
 303 /**********************************************************************
 304  Return a timeval struct of the uptime of this process. As TimeInit is
 305  done before a daemon fork then this is the start time from the parent
 306  daemon start. JRA.
 307 ***********************************************************************/
 308
 309 void get_process_uptime(struct timeval *ret_time)
 310 {
 311         struct timeval time_now_hires;
 312
 313         GetTimeOfDay(&time_now_hires);
 314         ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
 315         if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
 316                 ret_time->tv_sec -= 1;
 317                 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
 318         } else {
 319                 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
 320         }
 321 }
 322
 323 /**
 324  * @brief Get the startup time of the server.
 325  *
 326  * @param[out] ret_time A pointer to a timveal structure to set the startup
 327  *                      time.
 328  */
 329 void get_startup_time(struct timeval *ret_time)
 330 {
 331         ret_time->tv_sec = start_time_hires.tv_sec;
 332         ret_time->tv_usec = start_time_hires.tv_usec;
 333 }
 334
 335
 336 /****************************************************************************
 337  Convert a NTTIME structure to a time_t.
 338  It's originally in "100ns units".
 339
 340  This is an absolute version of the one above.
 341  By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
 342  if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
 343 ****************************************************************************/
 344
 345 time_t nt_time_to_unix_abs(const NTTIME *nt)
 346 {
 347         uint64_t d;
 348
 349         if (*nt == 0) {
 350                 return (time_t)0;
 351         }
 352
 353         if (*nt == (uint64_t)-1) {
 354                 return (time_t)-1;
 355         }
 356
 357         if (*nt == NTTIME_INFINITY) {
 358                 return (time_t)-1;
 359         }
 360
 361         /* reverse the time */
 362         /* it's a negative value, turn it to positive */
 363         d=~*nt;
 364
 365         d += 1000*1000*10/2;
 366         d /= 1000*1000*10;
 367
 368         if (!(TIME_T_MIN <= ((time_t)d) && ((time_t)d) <= TIME_T_MAX)) {
 369                 return (time_t)0;
 370         }
 371
 372         return (time_t)d;
 373 }
 374
 375 time_t uint64s_nt_time_to_unix_abs(const uint64_t *src)
 376 {
 377         NTTIME nttime;
 378         nttime = *src;
 379         return nt_time_to_unix_abs(&nttime);
 380 }
 381
 382 /****************************************************************************
 383  Convert a time_t to a NTTIME structure
 384
 385  This is an absolute version of the one above.
 386  By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
 387  If the time_t was 5 seconds, the NTTIME is 5 seconds. JFM
 388 ****************************************************************************/
 389
 390 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
 391 {
 392         double d;
 393
 394         if (t==0) {
 395                 *nt = 0;
 396                 return;
 397         }
 398
 399         if (t == TIME_T_MAX) {
 400                 *nt = 0x7fffffffffffffffLL;
 401                 return;
 402         }
 403
 404         if (t == (time_t)-1) {
 405                 /* that's what NT uses for infinite */
 406                 *nt = NTTIME_INFINITY;
 407                 return;
 408         }
 409
 410         d = (double)(t);
 411         d *= 1.0e7;
 412
 413         *nt = (NTTIME)d;
 414
 415         /* convert to a negative value */
 416         *nt=~*nt;
 417 }
 418
 419
 420 /****************************************************************************
 421  Utility function that always returns a const string even if localtime
 422  and asctime fail.
 423 ****************************************************************************/
 424
 425 const char *time_to_asc(const time_t t)
 426 {
 427         const char *asct;
 428         struct tm *lt = localtime(&t);
 429
 430         if (!lt) {
 431                 return "unknown time";
 432         }
 433
 434         asct = asctime(lt);
 435         if (!asct) {
 436                 return "unknown time";
 437         }
 438         return asct;
 439 }
 440
 441 const char *display_time(NTTIME nttime)
 442 {
 443         float high;
 444         float low;
 445         int sec;
 446         int days, hours, mins, secs;
 447
 448         if (nttime==0)
 449                 return "Now";
 450
 451         if (nttime==NTTIME_INFINITY)
 452                 return "Never";
 453
 454         high = 65536;
 455         high = high/10000;
 456         high = high*65536;
 457         high = high/1000;
 458         high = high * (~(nttime >> 32));
 459
 460         low = ~(nttime & 0xFFFFFFFF);
 461         low = low/(1000*1000*10);
 462
 463         sec=(int)(high+low);
 464
 465         days=sec/(60*60*24);
 466         hours=(sec - (days*60*60*24)) / (60*60);
 467         mins=(sec - (days*60*60*24) - (hours*60*60) ) / 60;
 468         secs=sec - (days*60*60*24) - (hours*60*60) - (mins*60);
 469
 470         return talloc_asprintf(talloc_tos(), "%u days, %u hours, %u minutes, "
 471                                "%u seconds", days, hours, mins, secs);
 472 }
 473
 474 bool nt_time_is_set(const NTTIME *nt)
 475 {
 476         if (*nt == 0x7FFFFFFFFFFFFFFFLL) {
 477                 return false;
 478         }
 479
 480         if (*nt == NTTIME_INFINITY) {
 481                 return false;
 482         }
 483
 484         return true;
 485 }