crypto/o_time.c

   1 /* crypto/o_time.c */
   2 /*
   3  * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
   4  * 2001.
   5  */
   6 /*
   7  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   8  * 2008.
   9  */
  10 /* ====================================================================
  11  * Copyright (c) 2001-2018 The OpenSSL Project.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  *
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  *
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in
  22  *    the documentation and/or other materials provided with the
  23  *    distribution.
  24  *
  25  * 3. All advertising materials mentioning features or use of this
  26  *    software must display the following acknowledgment:
  27  *    "This product includes software developed by the OpenSSL Project
  28  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  29  *
  30  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  31  *    endorse or promote products derived from this software without
  32  *    prior written permission. For written permission, please contact
  33  *    licensing@OpenSSL.org.
  34  *
  35  * 5. Products derived from this software may not be called "OpenSSL"
  36  *    nor may "OpenSSL" appear in their names without prior written
  37  *    permission of the OpenSSL Project.
  38  *
  39  * 6. Redistributions of any form whatsoever must retain the following
  40  *    acknowledgment:
  41  *    "This product includes software developed by the OpenSSL Project
  42  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  45  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  47  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  48  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  49  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  50  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  51  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  53  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  54  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  55  * OF THE POSSIBILITY OF SUCH DAMAGE.
  56  * ====================================================================
  57  *
  58  * This product includes cryptographic software written by Eric Young
  59  * (eay@cryptsoft.com).  This product includes software written by Tim
  60  * Hudson (tjh@cryptsoft.com).
  61  *
  62  */
  63
  64 #include <openssl/e_os2.h>
  65 #include <string.h>
  66 #include "o_time.h"
  67
  68 #ifdef OPENSSL_SYS_VMS
  69 # if __CRTL_VER >= 70000000 && \
  70      (defined _POSIX_C_SOURCE || !defined _ANSI_C_SOURCE)
  71 #  define VMS_GMTIME_OK
  72 # endif
  73 # ifndef VMS_GMTIME_OK
  74 #  include <libdtdef.h>
  75 #  include <lib$routines.h>
  76 #  include <lnmdef.h>
  77 #  include <starlet.h>
  78 #  include <descrip.h>
  79 #  include <stdlib.h>
  80 # endif                         /* ndef VMS_GMTIME_OK */
  81
  82
  83 /*
  84  * Needed to pick up the correct definitions and declarations in some of the
  85  * DEC C Header Files (*.H).
  86  */
  87 # define __NEW_STARLET 1
  88
  89 # if (defined(__alpha) || defined(__ia64))
  90 #  include <iledef.h>
  91 # else
  92
  93 /* VAX */
  94 typedef struct _ile3 {          /* Copied from ILEDEF.H for Alpha   */
  95 #  pragma __nomember_alignment
  96     unsigned short int ile3$w_length;        /* Length of buffer in bytes */
  97     unsigned short int ile3$w_code;          /* Item code value */
  98     void *ile3$ps_bufaddr;                   /* Buffer address */
  99     unsigned short int *ile3$ps_retlen_addr; /* Address of word for returned length */
 100 } ILE3;
 101 # endif   /* alpha || ia64    */
 102 #endif    /* OPENSSL_SYS_VMS  */
 103
 104 struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result)
 105 {
 106     struct tm *ts = NULL;
 107
 108 #if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_OS2) && (!defined(OPENSSL_SYS_VMS) || defined(gmtime_r)) && !defined(OPENSSL_SYS_SUNOS)
 109     if (gmtime_r(timer, result) == NULL)
 110         return NULL;
 111     ts = result;
 112 #elif !defined(OPENSSL_SYS_VMS) || defined(VMS_GMTIME_OK)
 113     ts = gmtime(timer);
 114     if (ts == NULL)
 115         return NULL;
 116
 117     memcpy(result, ts, sizeof(struct tm));
 118     ts = result;
 119 #endif
 120 #if defined( OPENSSL_SYS_VMS) && !defined( VMS_GMTIME_OK)
 121     if (ts == NULL) {
 122         static $DESCRIPTOR(tabnam, "LNM$DCL_LOGICAL");
 123         static $DESCRIPTOR(lognam, "SYS$TIMEZONE_DIFFERENTIAL");
 124         char logvalue[256];
 125         unsigned int reslen = 0;
 126 # if __INITIAL_POINTER_SIZE == 64
 127         ILEB_64 itemlist[2], *pitem;
 128 # else
 129         ILE3 itemlist[2], *pitem;
 130 # endif
 131         int status;
 132         time_t t;
 133
 134
 135         /*
 136          * Setup an itemlist for the call to $TRNLNM - Translate Logical Name.
 137          */
 138         pitem = itemlist;
 139
 140 # if __INITIAL_POINTER_SIZE == 64
 141         pitem->ileb_64$w_mbo = 1;
 142         pitem->ileb_64$w_code = LNM$_STRING;
 143         pitem->ileb_64$l_mbmo = -1;
 144         pitem->ileb_64$q_length = sizeof(logvalue);
 145         pitem->ileb_64$pq_bufaddr = logvalue;
 146         pitem->ileb_64$pq_retlen_addr = (unsigned __int64 *) &reslen;
 147         pitem++;
 148         /* Last item of the item list is null terminated */
 149         pitem->ileb_64$q_length = pitem->ileb_64$w_code = 0;
 150 # else
 151         pitem->ile3$w_length = sizeof(logvalue);
 152         pitem->ile3$w_code = LNM$_STRING;
 153         pitem->ile3$ps_bufaddr = logvalue;
 154         pitem->ile3$ps_retlen_addr = (unsigned short int *) &reslen;
 155         pitem++;
 156         /* Last item of the item list is null terminated */
 157         pitem->ile3$w_length = pitem->ile3$w_code = 0;
 158 # endif
 159
 160
 161         /* Get the value for SYS$TIMEZONE_DIFFERENTIAL */
 162         status = sys$trnlnm(0, &tabnam, &lognam, 0, itemlist);
 163         if (!(status & 1))
 164             return NULL;
 165         logvalue[reslen] = '\0';
 166
 167         t = *timer;
 168
 169         /* The following is extracted from the DEC C header time.h */
 170         /*
 171          **  Beginning in OpenVMS Version 7.0 mktime, time, ctime, strftime
 172          **  have two implementations.  One implementation is provided
 173          **  for compatibility and deals with time in terms of local time,
 174          **  the other __utc_* deals with time in terms of UTC.
 175          */
 176         /*
 177          * We use the same conditions as in said time.h to check if we should
 178          * assume that t contains local time (and should therefore be
 179          * adjusted) or UTC (and should therefore be left untouched).
 180          */
 181 # if __CRTL_VER < 70000000 || defined _VMS_V6_SOURCE
 182         /* Get the numerical value of the equivalence string */
 183         status = atoi(logvalue);
 184
 185         /* and use it to move time to GMT */
 186         t -= status;
 187 # endif
 188
 189         /* then convert the result to the time structure */
 190
 191         /*
 192          * Since there was no gmtime_r() to do this stuff for us, we have to
 193          * do it the hard way.
 194          */
 195         {
 196             /*-
 197              * The VMS epoch is the astronomical Smithsonian date,
 198                if I remember correctly, which is November 17, 1858.
 199                Furthermore, time is measure in thenths of microseconds
 200                and stored in quadwords (64 bit integers).  unix_epoch
 201                below is January 1st 1970 expressed as a VMS time.  The
 202                following code was used to get this number:
 203
 204                #include <stdio.h>
 205                #include <stdlib.h>
 206                #include <lib$routines.h>
 207                #include <starlet.h>
 208
 209                main()
 210                {
 211                  unsigned long systime[2];
 212                  unsigned short epoch_values[7] =
 213                    { 1970, 1, 1, 0, 0, 0, 0 };
 214
 215                  lib$cvt_vectim(epoch_values, systime);
 216
 217                  printf("%u %u", systime[0], systime[1]);
 218                }
 219             */
 220             unsigned long unix_epoch[2] = { 1273708544, 8164711 };
 221             unsigned long deltatime[2];
 222             unsigned long systime[2];
 223             struct vms_vectime {
 224                 short year, month, day, hour, minute, second, centi_second;
 225             } time_values;
 226             long operation;
 227
 228             /*
 229              * Turn the number of seconds since January 1st 1970 to an
 230              * internal delta time. Note that lib$cvt_to_internal_time() will
 231              * assume that t is signed, and will therefore break on 32-bit
 232              * systems some time in 2038.
 233              */
 234             operation = LIB$K_DELTA_SECONDS;
 235             status = lib$cvt_to_internal_time(&operation, &t, deltatime);
 236
 237             /*
 238              * Add the delta time with the Unix epoch and we have the current
 239              * UTC time in internal format
 240              */
 241             status = lib$add_times(unix_epoch, deltatime, systime);
 242
 243             /* Turn the internal time into a time vector */
 244             status = sys$numtim(&time_values, systime);
 245
 246             /* Fill in the struct tm with the result */
 247             result->tm_sec = time_values.second;
 248             result->tm_min = time_values.minute;
 249             result->tm_hour = time_values.hour;
 250             result->tm_mday = time_values.day;
 251             result->tm_mon = time_values.month - 1;
 252             result->tm_year = time_values.year - 1900;
 253
 254             operation = LIB$K_DAY_OF_WEEK;
 255             status = lib$cvt_from_internal_time(&operation,
 256                                                 &result->tm_wday, systime);
 257             result->tm_wday %= 7;
 258
 259             operation = LIB$K_DAY_OF_YEAR;
 260             status = lib$cvt_from_internal_time(&operation,
 261                                                 &result->tm_yday, systime);
 262             result->tm_yday--;
 263
 264             result->tm_isdst = 0; /* There's no way to know... */
 265
 266             ts = result;
 267         }
 268     }
 269 #endif
 270     return ts;
 271 }
 272
 273 /*
 274  * Take a tm structure and add an offset to it. This avoids any OS issues
 275  * with restricted date types and overflows which cause the year 2038
 276  * problem.
 277  */
 278
 279 #define SECS_PER_DAY (24 * 60 * 60)
 280
 281 static long date_to_julian(int y, int m, int d);
 282 static void julian_to_date(long jd, int *y, int *m, int *d);
 283 static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
 284                       long *pday, int *psec);
 285
 286 int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
 287 {
 288     int time_sec, time_year, time_month, time_day;
 289     long time_jd;
 290
 291     /* Convert time and offset into julian day and seconds */
 292     if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))
 293         return 0;
 294
 295     /* Convert Julian day back to date */
 296
 297     julian_to_date(time_jd, &time_year, &time_month, &time_day);
 298
 299     if (time_year < 1900 || time_year > 9999)
 300         return 0;
 301
 302     /* Update tm structure */
 303
 304     tm->tm_year = time_year - 1900;
 305     tm->tm_mon = time_month - 1;
 306     tm->tm_mday = time_day;
 307
 308     tm->tm_hour = time_sec / 3600;
 309     tm->tm_min = (time_sec / 60) % 60;
 310     tm->tm_sec = time_sec % 60;
 311
 312     return 1;
 313
 314 }
 315
 316 int OPENSSL_gmtime_diff(int *pday, int *psec,
 317                         const struct tm *from, const struct tm *to)
 318 {
 319     int from_sec, to_sec, diff_sec;
 320     long from_jd, to_jd, diff_day;
 321     if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
 322         return 0;
 323     if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
 324         return 0;
 325     diff_day = to_jd - from_jd;
 326     diff_sec = to_sec - from_sec;
 327     /* Adjust differences so both positive or both negative */
 328     if (diff_day > 0 && diff_sec < 0) {
 329         diff_day--;
 330         diff_sec += SECS_PER_DAY;
 331     }
 332     if (diff_day < 0 && diff_sec > 0) {
 333         diff_day++;
 334         diff_sec -= SECS_PER_DAY;
 335     }
 336
 337     if (pday)
 338         *pday = (int)diff_day;
 339     if (psec)
 340         *psec = diff_sec;
 341
 342     return 1;
 343
 344 }
 345
 346 /* Convert tm structure and offset into julian day and seconds */
 347 static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
 348                       long *pday, int *psec)
 349 {
 350     int offset_hms, offset_day;
 351     long time_jd;
 352     int time_year, time_month, time_day;
 353     /* split offset into days and day seconds */
 354     offset_day = offset_sec / SECS_PER_DAY;
 355     /* Avoid sign issues with % operator */
 356     offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
 357     offset_day += off_day;
 358     /* Add current time seconds to offset */
 359     offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
 360     /* Adjust day seconds if overflow */
 361     if (offset_hms >= SECS_PER_DAY) {
 362         offset_day++;
 363         offset_hms -= SECS_PER_DAY;
 364     } else if (offset_hms < 0) {
 365         offset_day--;
 366         offset_hms += SECS_PER_DAY;
 367     }
 368
 369     /*
 370      * Convert date of time structure into a Julian day number.
 371      */
 372
 373     time_year = tm->tm_year + 1900;
 374     time_month = tm->tm_mon + 1;
 375     time_day = tm->tm_mday;
 376
 377     time_jd = date_to_julian(time_year, time_month, time_day);
 378
 379     /* Work out Julian day of new date */
 380     time_jd += offset_day;
 381
 382     if (time_jd < 0)
 383         return 0;
 384
 385     *pday = time_jd;
 386     *psec = offset_hms;
 387     return 1;
 388 }
 389
 390 /*
 391  * Convert date to and from julian day Uses Fliegel & Van Flandern algorithm
 392  */
 393 static long date_to_julian(int y, int m, int d)
 394 {
 395     return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
 396         (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
 397         (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
 398 }
 399
 400 static void julian_to_date(long jd, int *y, int *m, int *d)
 401 {
 402     long L = jd + 68569;
 403     long n = (4 * L) / 146097;
 404     long i, j;
 405
 406     L = L - (146097 * n + 3) / 4;
 407     i = (4000 * (L + 1)) / 1461001;
 408     L = L - (1461 * i) / 4 + 31;
 409     j = (80 * L) / 2447;
 410     *d = L - (2447 * j) / 80;
 411     L = j / 11;
 412     *m = j + 2 - (12 * L);
 413     *y = 100 * (n - 49) + i + L;
 414 }
 415
 416 #ifdef OPENSSL_TIME_TEST
 417
 418 # include <stdio.h>
 419
 420 /*
 421  * Time checking test code. Check times are identical for a wide range of
 422  * offsets. This should be run on a machine with 64 bit time_t or it will
 423  * trigger the very errors the routines fix.
 424  */
 425
 426 int main(int argc, char **argv)
 427 {
 428     long offset;
 429     for (offset = 0; offset < 1000000; offset++) {
 430         check_time(offset);
 431         check_time(-offset);
 432         check_time(offset * 1000);
 433         check_time(-offset * 1000);
 434     }
 435 }
 436
 437 int check_time(long offset)
 438 {
 439     struct tm tm1, tm2, o1;
 440     int off_day, off_sec;
 441     long toffset;
 442     time_t t1, t2;
 443     time(&t1);
 444     t2 = t1 + offset;
 445     OPENSSL_gmtime(&t2, &tm2);
 446     OPENSSL_gmtime(&t1, &tm1);
 447     o1 = tm1;
 448     OPENSSL_gmtime_adj(&tm1, 0, offset);
 449     if ((tm1.tm_year != tm2.tm_year) ||
 450         (tm1.tm_mon != tm2.tm_mon) ||
 451         (tm1.tm_mday != tm2.tm_mday) ||
 452         (tm1.tm_hour != tm2.tm_hour) ||
 453         (tm1.tm_min != tm2.tm_min) || (tm1.tm_sec != tm2.tm_sec)) {
 454         fprintf(stderr, "TIME ERROR!!\n");
 455         fprintf(stderr, "Time1: %d/%d/%d, %d:%02d:%02d\n",
 456                 tm2.tm_mday, tm2.tm_mon + 1, tm2.tm_year + 1900,
 457                 tm2.tm_hour, tm2.tm_min, tm2.tm_sec);
 458         fprintf(stderr, "Time2: %d/%d/%d, %d:%02d:%02d\n",
 459                 tm1.tm_mday, tm1.tm_mon + 1, tm1.tm_year + 1900,
 460                 tm1.tm_hour, tm1.tm_min, tm1.tm_sec);
 461         return 0;
 462     }
 463     OPENSSL_gmtime_diff(&o1, &tm1, &off_day, &off_sec);
 464     toffset = (long)off_day *SECS_PER_DAY + off_sec;
 465     if (offset != toffset) {
 466         fprintf(stderr, "TIME OFFSET ERROR!!\n");
 467         fprintf(stderr, "Expected %ld, Got %ld (%d:%d)\n",
 468                 offset, toffset, off_day, off_sec);
 469         return 0;
 470     }
 471     return 1;
 472 }
 473
 474 #endif