crypto/o_time.c

   1 /*
   2  * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/e_os2.h>
  11 #include <string.h>
  12 #include <openssl/crypto.h>
  13
  14 #ifdef OPENSSL_SYS_VMS
  15 # if __CRTL_VER >= 70000000 && \
  16      (defined _POSIX_C_SOURCE || !defined _ANSI_C_SOURCE)
  17 #  define VMS_GMTIME_OK
  18 # endif
  19 # ifndef VMS_GMTIME_OK
  20 #  include <libdtdef.h>
  21 #  include <lib$routines.h>
  22 #  include <lnmdef.h>
  23 #  include <starlet.h>
  24 #  include <descrip.h>
  25 #  include <stdlib.h>
  26 # endif                         /* ndef VMS_GMTIME_OK */
  27
  28
  29 /*
  30  * Needed to pick up the correct definitions and declarations in some of the
  31  * DEC C Header Files (*.H).
  32  */
  33 # define __NEW_STARLET 1
  34
  35 # if (defined(__alpha) || defined(__ia64))
  36 #  include <iledef.h>
  37 # else
  38
  39 /* VAX */
  40 typedef struct _ile3 {          /* Copied from ILEDEF.H for Alpha   */
  41 #  pragma __nomember_alignment
  42     unsigned short int ile3$w_length;        /* Length of buffer in bytes */
  43     unsigned short int ile3$w_code;          /* Item code value */
  44     void *ile3$ps_bufaddr;                   /* Buffer address */
  45     unsigned short int *ile3$ps_retlen_addr; /* Address of word for returned length */
  46 } ILE3;
  47 # endif   /* alpha || ia64    */
  48 #endif    /* OPENSSL_SYS_VMS  */
  49
  50 struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result)
  51 {
  52     struct tm *ts = NULL;
  53
  54 #if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && (!defined(OPENSSL_SYS_VMS) || defined(gmtime_r)) && !defined(OPENSSL_SYS_MACOSX)
  55     /*
  56      * should return &data, but doesn't on some systems, so we don't even
  57      * look at the return value
  58      */
  59     gmtime_r(timer, result);
  60     ts = result;
  61 #elif !defined(OPENSSL_SYS_VMS) || defined(VMS_GMTIME_OK)
  62     ts = gmtime(timer);
  63     if (ts == NULL)
  64         return NULL;
  65
  66     memcpy(result, ts, sizeof(struct tm));
  67     ts = result;
  68 #endif
  69 #if defined( OPENSSL_SYS_VMS) && !defined( VMS_GMTIME_OK)
  70     if (ts == NULL) {
  71         static $DESCRIPTOR(tabnam, "LNM$DCL_LOGICAL");
  72         static $DESCRIPTOR(lognam, "SYS$TIMEZONE_DIFFERENTIAL");
  73         char logvalue[256];
  74         unsigned int reslen = 0;
  75 # if __INITIAL_POINTER_SIZE == 64
  76         ILEB_64 itemlist[2], *pitem;
  77 # else
  78         ILE3 itemlist[2], *pitem;
  79 # endif
  80         int status;
  81         time_t t;
  82
  83
  84         /*
  85          * Setup an itemlist for the call to $TRNLNM - Translate Logical Name.
  86          */
  87         pitem = itemlist;
  88
  89 # if __INITIAL_POINTER_SIZE == 64
  90         pitem->ileb_64$w_mbo = 1;
  91         pitem->ileb_64$w_code = LNM$_STRING;
  92         pitem->ileb_64$l_mbmo = -1;
  93         pitem->ileb_64$q_length = sizeof (logvalue);
  94         pitem->ileb_64$pq_bufaddr = logvalue;
  95         pitem->ileb_64$pq_retlen_addr = (unsigned __int64 *) &reslen;
  96         pitem++;
  97         /* Last item of the item list is null terminated */
  98         pitem->ileb_64$q_length = pitem->ileb_64$w_code = 0;
  99 # else
 100         pitem->ile3$w_length = sizeof (logvalue);
 101         pitem->ile3$w_code = LNM$_STRING;
 102         pitem->ile3$ps_bufaddr = logvalue;
 103         pitem->ile3$ps_retlen_addr = (unsigned short int *) &reslen;
 104         pitem++;
 105         /* Last item of the item list is null terminated */
 106         pitem->ile3$w_length = pitem->ile3$w_code = 0;
 107 # endif
 108
 109
 110         /* Get the value for SYS$TIMEZONE_DIFFERENTIAL */
 111         status = sys$trnlnm(0, &tabnam, &lognam, 0, itemlist);
 112         if (!(status & 1))
 113             return NULL;
 114         logvalue[reslen] = '\0';
 115
 116         t = *timer;
 117
 118         /* The following is extracted from the DEC C header time.h */
 119         /*
 120          **  Beginning in OpenVMS Version 7.0 mktime, time, ctime, strftime
 121          **  have two implementations.  One implementation is provided
 122          **  for compatibility and deals with time in terms of local time,
 123          **  the other __utc_* deals with time in terms of UTC.
 124          */
 125         /*
 126          * We use the same conditions as in said time.h to check if we should
 127          * assume that t contains local time (and should therefore be
 128          * adjusted) or UTC (and should therefore be left untouched).
 129          */
 130 # if __CRTL_VER < 70000000 || defined _VMS_V6_SOURCE
 131         /* Get the numerical value of the equivalence string */
 132         status = atoi(logvalue);
 133
 134         /* and use it to move time to GMT */
 135         t -= status;
 136 # endif
 137
 138         /* then convert the result to the time structure */
 139
 140         /*
 141          * Since there was no gmtime_r() to do this stuff for us, we have to
 142          * do it the hard way.
 143          */
 144         {
 145             /*-
 146              * The VMS epoch is the astronomical Smithsonian date,
 147                if I remember correctly, which is November 17, 1858.
 148                Furthermore, time is measure in tenths of microseconds
 149                and stored in quadwords (64 bit integers).  unix_epoch
 150                below is January 1st 1970 expressed as a VMS time.  The
 151                following code was used to get this number:
 152
 153                #include <stdio.h>
 154                #include <stdlib.h>
 155                #include <lib$routines.h>
 156                #include <starlet.h>
 157
 158                main()
 159                {
 160                  unsigned long systime[2];
 161                  unsigned short epoch_values[7] =
 162                    { 1970, 1, 1, 0, 0, 0, 0 };
 163
 164                  lib$cvt_vectim(epoch_values, systime);
 165
 166                  printf("%u %u", systime[0], systime[1]);
 167                }
 168             */
 169             unsigned long unix_epoch[2] = { 1273708544, 8164711 };
 170             unsigned long deltatime[2];
 171             unsigned long systime[2];
 172             struct vms_vectime {
 173                 short year, month, day, hour, minute, second, centi_second;
 174             } time_values;
 175             long operation;
 176
 177             /*
 178              * Turn the number of seconds since January 1st 1970 to an
 179              * internal delta time. Note that lib$cvt_to_internal_time() will
 180              * assume that t is signed, and will therefore break on 32-bit
 181              * systems some time in 2038.
 182              */
 183             operation = LIB$K_DELTA_SECONDS;
 184             status = lib$cvt_to_internal_time(&operation, &t, deltatime);
 185
 186             /*
 187              * Add the delta time with the Unix epoch and we have the current
 188              * UTC time in internal format
 189              */
 190             status = lib$add_times(unix_epoch, deltatime, systime);
 191
 192             /* Turn the internal time into a time vector */
 193             status = sys$numtim(&time_values, systime);
 194
 195             /* Fill in the struct tm with the result */
 196             result->tm_sec = time_values.second;
 197             result->tm_min = time_values.minute;
 198             result->tm_hour = time_values.hour;
 199             result->tm_mday = time_values.day;
 200             result->tm_mon = time_values.month - 1;
 201             result->tm_year = time_values.year - 1900;
 202
 203             operation = LIB$K_DAY_OF_WEEK;
 204             status = lib$cvt_from_internal_time(&operation,
 205                                                 &result->tm_wday, systime);
 206             result->tm_wday %= 7;
 207
 208             operation = LIB$K_DAY_OF_YEAR;
 209             status = lib$cvt_from_internal_time(&operation,
 210                                                 &result->tm_yday, systime);
 211             result->tm_yday--;
 212
 213             result->tm_isdst = 0; /* There's no way to know... */
 214
 215             ts = result;
 216         }
 217     }
 218 #endif
 219     return ts;
 220 }
 221
 222 /*
 223  * Take a tm structure and add an offset to it. This avoids any OS issues
 224  * with restricted date types and overflows which cause the year 2038
 225  * problem.
 226  */
 227
 228 #define SECS_PER_DAY (24 * 60 * 60)
 229
 230 static long date_to_julian(int y, int m, int d);
 231 static void julian_to_date(long jd, int *y, int *m, int *d);
 232 static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
 233                       long *pday, int *psec);
 234
 235 int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
 236 {
 237     int time_sec, time_year, time_month, time_day;
 238     long time_jd;
 239
 240     /* Convert time and offset into Julian day and seconds */
 241     if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))
 242         return 0;
 243
 244     /* Convert Julian day back to date */
 245
 246     julian_to_date(time_jd, &time_year, &time_month, &time_day);
 247
 248     if (time_year < 1900 || time_year > 9999)
 249         return 0;
 250
 251     /* Update tm structure */
 252
 253     tm->tm_year = time_year - 1900;
 254     tm->tm_mon = time_month - 1;
 255     tm->tm_mday = time_day;
 256
 257     tm->tm_hour = time_sec / 3600;
 258     tm->tm_min = (time_sec / 60) % 60;
 259     tm->tm_sec = time_sec % 60;
 260
 261     return 1;
 262
 263 }
 264
 265 int OPENSSL_gmtime_diff(int *pday, int *psec,
 266                         const struct tm *from, const struct tm *to)
 267 {
 268     int from_sec, to_sec, diff_sec;
 269     long from_jd, to_jd, diff_day;
 270     if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
 271         return 0;
 272     if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
 273         return 0;
 274     diff_day = to_jd - from_jd;
 275     diff_sec = to_sec - from_sec;
 276     /* Adjust differences so both positive or both negative */
 277     if (diff_day > 0 && diff_sec < 0) {
 278         diff_day--;
 279         diff_sec += SECS_PER_DAY;
 280     }
 281     if (diff_day < 0 && diff_sec > 0) {
 282         diff_day++;
 283         diff_sec -= SECS_PER_DAY;
 284     }
 285
 286     if (pday)
 287         *pday = (int)diff_day;
 288     if (psec)
 289         *psec = diff_sec;
 290
 291     return 1;
 292
 293 }
 294
 295 /* Convert tm structure and offset into julian day and seconds */
 296 static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
 297                       long *pday, int *psec)
 298 {
 299     int offset_hms, offset_day;
 300     long time_jd;
 301     int time_year, time_month, time_day;
 302     /* split offset into days and day seconds */
 303     offset_day = offset_sec / SECS_PER_DAY;
 304     /* Avoid sign issues with % operator */
 305     offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
 306     offset_day += off_day;
 307     /* Add current time seconds to offset */
 308     offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
 309     /* Adjust day seconds if overflow */
 310     if (offset_hms >= SECS_PER_DAY) {
 311         offset_day++;
 312         offset_hms -= SECS_PER_DAY;
 313     } else if (offset_hms < 0) {
 314         offset_day--;
 315         offset_hms += SECS_PER_DAY;
 316     }
 317
 318     /*
 319      * Convert date of time structure into a Julian day number.
 320      */
 321
 322     time_year = tm->tm_year + 1900;
 323     time_month = tm->tm_mon + 1;
 324     time_day = tm->tm_mday;
 325
 326     time_jd = date_to_julian(time_year, time_month, time_day);
 327
 328     /* Work out Julian day of new date */
 329     time_jd += offset_day;
 330
 331     if (time_jd < 0)
 332         return 0;
 333
 334     *pday = time_jd;
 335     *psec = offset_hms;
 336     return 1;
 337 }
 338
 339 /*
 340  * Convert date to and from julian day Uses Fliegel & Van Flandern algorithm
 341  */
 342 static long date_to_julian(int y, int m, int d)
 343 {
 344     return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
 345         (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
 346         (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
 347 }
 348
 349 static void julian_to_date(long jd, int *y, int *m, int *d)
 350 {
 351     long L = jd + 68569;
 352     long n = (4 * L) / 146097;
 353     long i, j;
 354
 355     L = L - (146097 * n + 3) / 4;
 356     i = (4000 * (L + 1)) / 1461001;
 357     L = L - (1461 * i) / 4 + 31;
 358     j = (80 * L) / 2447;
 359     *d = L - (2447 * j) / 80;
 360     L = j / 11;
 361     *m = j + 2 - (12 * L);
 362     *y = 100 * (n - 49) + i + L;
 363 }