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         return pull_dos_date(date_ptr, zone_offset);
 202 }
 203
 204 /*******************************************************************
 205  Like make_unix_date() but the words are reversed.
 206 ********************************************************************/
 207
 208 time_t make_unix_date2(const void *date_ptr, int zone_offset)
 209 {
 210         uint32_t x,x2;
 211
 212         x = IVAL(date_ptr,0);
 213         x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 214         SIVAL(&x,0,x2);
 215
 216         return(make_unix_date((const void *)&x, zone_offset));
 217 }
 218
 219 /*******************************************************************
 220  Create a unix GMT date from a dos date in 32 bit "unix like" format
 221  these generally arrive as localtimes, with corresponding DST.
 222 ******************************************************************/
 223
 224 time_t make_unix_date3(const void *date_ptr, int zone_offset)
 225 {
 226         time_t t = (time_t)IVAL(date_ptr,0);
 227         if (!null_time(t)) {
 228                 t += zone_offset;
 229         }
 230         return(t);
 231 }
 232
 233 time_t srv_make_unix_date(const void *date_ptr)
 234 {
 235         return make_unix_date(date_ptr, server_zone_offset);
 236 }
 237
 238 time_t srv_make_unix_date2(const void *date_ptr)
 239 {
 240         return make_unix_date2(date_ptr, server_zone_offset);
 241 }
 242
 243 time_t srv_make_unix_date3(const void *date_ptr)
 244 {
 245         return make_unix_date3(date_ptr, server_zone_offset);
 246 }
 247
 248 /****************************************************************************
 249  Interprets an nt time into a unix struct timespec.
 250  Differs from nt_time_to_unix in that an 8 byte value of 0xffffffffffffffff
 251  will be returned as (time_t)-1, whereas nt_time_to_unix returns 0 in this case.
 252 ****************************************************************************/
 253
 254 struct timespec interpret_long_date(const char *p)
 255 {
 256         NTTIME nt;
 257         nt = IVAL(p,0) + ((uint64_t)IVAL(p,4) << 32);
 258         if (nt == (uint64_t)-1) {
 259                 struct timespec ret;
 260                 ret.tv_sec = (time_t)-1;
 261                 ret.tv_nsec = 0;
 262                 return ret;
 263         }
 264         return nt_time_to_unix_timespec(&nt);
 265 }
 266
 267 /*******************************************************************
 268  Re-read the smb serverzone value.
 269 ******************************************************************/
 270
 271 static struct timeval start_time_hires;
 272
 273 void TimeInit(void)
 274 {
 275         set_server_zone_offset(time(NULL));
 276
 277         DEBUG(4,("TimeInit: Serverzone is %d\n", server_zone_offset));
 278
 279         /* Save the start time of this process. */
 280         if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0) {
 281                 GetTimeOfDay(&start_time_hires);
 282         }
 283 }
 284
 285 /**********************************************************************
 286  Return a timeval struct of the uptime of this process. As TimeInit is
 287  done before a daemon fork then this is the start time from the parent
 288  daemon start. JRA.
 289 ***********************************************************************/
 290
 291 void get_process_uptime(struct timeval *ret_time)
 292 {
 293         struct timeval time_now_hires;
 294
 295         GetTimeOfDay(&time_now_hires);
 296         ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
 297         if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
 298                 ret_time->tv_sec -= 1;
 299                 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
 300         } else {
 301                 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
 302         }
 303 }
 304
 305 /**
 306  * @brief Get the startup time of the server.
 307  *
 308  * @param[out] ret_time A pointer to a timveal structure to set the startup
 309  *                      time.
 310  */
 311 void get_startup_time(struct timeval *ret_time)
 312 {
 313         ret_time->tv_sec = start_time_hires.tv_sec;
 314         ret_time->tv_usec = start_time_hires.tv_usec;
 315 }
 316
 317
 318 /****************************************************************************
 319  Convert a NTTIME structure to a time_t.
 320  It's originally in "100ns units".
 321
 322  This is an absolute version of the one above.
 323  By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
 324  if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
 325 ****************************************************************************/
 326
 327 time_t nt_time_to_unix_abs(const NTTIME *nt)
 328 {
 329         uint64_t d;
 330
 331         if (*nt == 0) {
 332                 return (time_t)0;
 333         }
 334
 335         if (*nt == (uint64_t)-1) {
 336                 return (time_t)-1;
 337         }
 338
 339         if (*nt == NTTIME_INFINITY) {
 340                 return (time_t)-1;
 341         }
 342
 343         /* reverse the time */
 344         /* it's a negative value, turn it to positive */
 345         d=~*nt;
 346
 347         d += 1000*1000*10/2;
 348         d /= 1000*1000*10;
 349
 350         if (!(TIME_T_MIN <= ((time_t)d) && ((time_t)d) <= TIME_T_MAX)) {
 351                 return (time_t)0;
 352         }
 353
 354         return (time_t)d;
 355 }
 356
 357 time_t uint64s_nt_time_to_unix_abs(const uint64_t *src)
 358 {
 359         NTTIME nttime;
 360         nttime = *src;
 361         return nt_time_to_unix_abs(&nttime);
 362 }
 363
 364 /****************************************************************************
 365  Convert a time_t to a NTTIME structure
 366
 367  This is an absolute version of the one above.
 368  By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
 369  If the time_t was 5 seconds, the NTTIME is 5 seconds. JFM
 370 ****************************************************************************/
 371
 372 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
 373 {
 374         double d;
 375
 376         if (t==0) {
 377                 *nt = 0;
 378                 return;
 379         }
 380
 381         if (t == TIME_T_MAX) {
 382                 *nt = 0x7fffffffffffffffLL;
 383                 return;
 384         }
 385
 386         if (t == (time_t)-1) {
 387                 /* that's what NT uses for infinite */
 388                 *nt = NTTIME_INFINITY;
 389                 return;
 390         }
 391
 392         d = (double)(t);
 393         d *= 1.0e7;
 394
 395         *nt = (NTTIME)d;
 396
 397         /* convert to a negative value */
 398         *nt=~*nt;
 399 }
 400
 401
 402 /****************************************************************************
 403  Utility function that always returns a const string even if localtime
 404  and asctime fail.
 405 ****************************************************************************/
 406
 407 const char *time_to_asc(const time_t t)
 408 {
 409         const char *asct;
 410         struct tm *lt = localtime(&t);
 411
 412         if (!lt) {
 413                 return "unknown time";
 414         }
 415
 416         asct = asctime(lt);
 417         if (!asct) {
 418                 return "unknown time";
 419         }
 420         return asct;
 421 }
 422
 423 const char *display_time(NTTIME nttime)
 424 {
 425         float high;
 426         float low;
 427         int sec;
 428         int days, hours, mins, secs;
 429
 430         if (nttime==0)
 431                 return "Now";
 432
 433         if (nttime==NTTIME_INFINITY)
 434                 return "Never";
 435
 436         high = 65536;
 437         high = high/10000;
 438         high = high*65536;
 439         high = high/1000;
 440         high = high * (~(nttime >> 32));
 441
 442         low = ~(nttime & 0xFFFFFFFF);
 443         low = low/(1000*1000*10);
 444
 445         sec=(int)(high+low);
 446
 447         days=sec/(60*60*24);
 448         hours=(sec - (days*60*60*24)) / (60*60);
 449         mins=(sec - (days*60*60*24) - (hours*60*60) ) / 60;
 450         secs=sec - (days*60*60*24) - (hours*60*60) - (mins*60);
 451
 452         return talloc_asprintf(talloc_tos(), "%u days, %u hours, %u minutes, "
 453                                "%u seconds", days, hours, mins, secs);
 454 }
 455
 456 bool nt_time_is_set(const NTTIME *nt)
 457 {
 458         if (*nt == 0x7FFFFFFFFFFFFFFFLL) {
 459                 return false;
 460         }
 461
 462         if (*nt == NTTIME_INFINITY) {
 463                 return false;
 464         }
 465
 466         return true;
 467 }