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 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 #endif
  82
  83 struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result)
  84 {
  85     struct tm *ts = NULL;
  86
  87 #if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_OS2) && (!defined(OPENSSL_SYS_VMS) || defined(gmtime_r)) && !defined(OPENSSL_SYS_MACOSX) && !defined(OPENSSL_SYS_SUNOS)
  88     /*
  89      * should return &data, but doesn't on some systems, so we don't even
  90      * look at the return value
  91      */
  92     gmtime_r(timer, result);
  93     ts = result;
  94 #elif !defined(OPENSSL_SYS_VMS) || defined(VMS_GMTIME_OK)
  95     ts = gmtime(timer);
  96     if (ts == NULL)
  97         return NULL;
  98
  99     memcpy(result, ts, sizeof(struct tm));
 100     ts = result;
 101 #endif
 102 #if defined( OPENSSL_SYS_VMS) && !defined( VMS_GMTIME_OK)
 103     if (ts == NULL) {
 104         static $DESCRIPTOR(tabnam, "LNM$DCL_LOGICAL");
 105         static $DESCRIPTOR(lognam, "SYS$TIMEZONE_DIFFERENTIAL");
 106         char logvalue[256];
 107         unsigned int reslen = 0;
 108         struct {
 109             short buflen;
 110             short code;
 111             void *bufaddr;
 112             unsigned int *reslen;
 113         } itemlist[] = {
 114             {
 115                 0, LNM$_STRING, 0, 0
 116             },
 117             {
 118                 0, 0, 0, 0
 119             },
 120         };
 121         int status;
 122         time_t t;
 123
 124         /* Get the value for SYS$TIMEZONE_DIFFERENTIAL */
 125         itemlist[0].buflen = sizeof(logvalue);
 126         itemlist[0].bufaddr = logvalue;
 127         itemlist[0].reslen = &reslen;
 128         status = sys$trnlnm(0, &tabnam, &lognam, 0, itemlist);
 129         if (!(status & 1))
 130             return NULL;
 131         logvalue[reslen] = '\0';
 132
 133         t = *timer;
 134
 135 /* The following is extracted from the DEC C header time.h */
 136         /*
 137          **  Beginning in OpenVMS Version 7.0 mktime, time, ctime, strftime
 138          **  have two implementations.  One implementation is provided
 139          **  for compatibility and deals with time in terms of local time,
 140          **  the other __utc_* deals with time in terms of UTC.
 141          */
 142         /*
 143          * We use the same conditions as in said time.h to check if we should
 144          * assume that t contains local time (and should therefore be
 145          * adjusted) or UTC (and should therefore be left untouched).
 146          */
 147 # if __CRTL_VER < 70000000 || defined _VMS_V6_SOURCE
 148         /* Get the numerical value of the equivalence string */
 149         status = atoi(logvalue);
 150
 151         /* and use it to move time to GMT */
 152         t -= status;
 153 # endif
 154
 155         /* then convert the result to the time structure */
 156
 157         /*
 158          * Since there was no gmtime_r() to do this stuff for us, we have to
 159          * do it the hard way.
 160          */
 161         {
 162             /*-
 163              * The VMS epoch is the astronomical Smithsonian date,
 164                if I remember correctly, which is November 17, 1858.
 165                Furthermore, time is measure in thenths of microseconds
 166                and stored in quadwords (64 bit integers).  unix_epoch
 167                below is January 1st 1970 expressed as a VMS time.  The
 168                following code was used to get this number:
 169
 170                #include <stdio.h>
 171                #include <stdlib.h>
 172                #include <lib$routines.h>
 173                #include <starlet.h>
 174
 175                main()
 176                {
 177                  unsigned long systime[2];
 178                  unsigned short epoch_values[7] =
 179                    { 1970, 1, 1, 0, 0, 0, 0 };
 180
 181                  lib$cvt_vectim(epoch_values, systime);
 182
 183                  printf("%u %u", systime[0], systime[1]);
 184                }
 185             */
 186             unsigned long unix_epoch[2] = { 1273708544, 8164711 };
 187             unsigned long deltatime[2];
 188             unsigned long systime[2];
 189             struct vms_vectime {
 190                 short year, month, day, hour, minute, second, centi_second;
 191             } time_values;
 192             long operation;
 193
 194             /*
 195              * Turn the number of seconds since January 1st 1970 to an
 196              * internal delta time. Note that lib$cvt_to_internal_time() will
 197              * assume that t is signed, and will therefore break on 32-bit
 198              * systems some time in 2038.
 199              */
 200             operation = LIB$K_DELTA_SECONDS;
 201             status = lib$cvt_to_internal_time(&operation, &t, deltatime);
 202
 203             /*
 204              * Add the delta time with the Unix epoch and we have the current
 205              * UTC time in internal format
 206              */
 207             status = lib$add_times(unix_epoch, deltatime, systime);
 208
 209             /* Turn the internal time into a time vector */
 210             status = sys$numtim(&time_values, systime);
 211
 212             /* Fill in the struct tm with the result */
 213             result->tm_sec = time_values.second;
 214             result->tm_min = time_values.minute;
 215             result->tm_hour = time_values.hour;
 216             result->tm_mday = time_values.day;
 217             result->tm_mon = time_values.month - 1;
 218             result->tm_year = time_values.year - 1900;
 219
 220             operation = LIB$K_DAY_OF_WEEK;
 221             status = lib$cvt_from_internal_time(&operation,
 222                                                 &result->tm_wday, systime);
 223             result->tm_wday %= 7;
 224
 225             operation = LIB$K_DAY_OF_YEAR;
 226             status = lib$cvt_from_internal_time(&operation,
 227                                                 &result->tm_yday, systime);
 228             result->tm_yday--;
 229
 230             result->tm_isdst = 0; /* There's no way to know... */
 231
 232             ts = result;
 233         }
 234     }
 235 #endif
 236     return ts;
 237 }
 238
 239 /*
 240  * Take a tm structure and add an offset to it. This avoids any OS issues
 241  * with restricted date types and overflows which cause the year 2038
 242  * problem.
 243  */
 244
 245 #define SECS_PER_DAY (24 * 60 * 60)
 246
 247 static long date_to_julian(int y, int m, int d);
 248 static void julian_to_date(long jd, int *y, int *m, int *d);
 249
 250 int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
 251 {
 252     int offset_hms, offset_day;
 253     long time_jd;
 254     int time_year, time_month, time_day;
 255     /* split offset into days and day seconds */
 256     offset_day = offset_sec / SECS_PER_DAY;
 257     /* Avoid sign issues with % operator */
 258     offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
 259     offset_day += off_day;
 260     /* Add current time seconds to offset */
 261     offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
 262     /* Adjust day seconds if overflow */
 263     if (offset_hms >= SECS_PER_DAY) {
 264         offset_day++;
 265         offset_hms -= SECS_PER_DAY;
 266     } else if (offset_hms < 0) {
 267         offset_day--;
 268         offset_hms += SECS_PER_DAY;
 269     }
 270
 271     /*
 272      * Convert date of time structure into a Julian day number.
 273      */
 274
 275     time_year = tm->tm_year + 1900;
 276     time_month = tm->tm_mon + 1;
 277     time_day = tm->tm_mday;
 278
 279     time_jd = date_to_julian(time_year, time_month, time_day);
 280
 281     /* Work out Julian day of new date */
 282     time_jd += offset_day;
 283
 284     if (time_jd < 0)
 285         return 0;
 286
 287     /* Convert Julian day back to date */
 288
 289     julian_to_date(time_jd, &time_year, &time_month, &time_day);
 290
 291     if (time_year < 1900 || time_year > 9999)
 292         return 0;
 293
 294     /* Update tm structure */
 295
 296     tm->tm_year = time_year - 1900;
 297     tm->tm_mon = time_month - 1;
 298     tm->tm_mday = time_day;
 299
 300     tm->tm_hour = offset_hms / 3600;
 301     tm->tm_min = (offset_hms / 60) % 60;
 302     tm->tm_sec = offset_hms % 60;
 303
 304     return 1;
 305
 306 }
 307
 308 /*
 309  * Convert date to and from julian day Uses Fliegel & Van Flandern algorithm
 310  */
 311 static long date_to_julian(int y, int m, int d)
 312 {
 313     return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
 314         (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
 315         (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
 316 }
 317
 318 static void julian_to_date(long jd, int *y, int *m, int *d)
 319 {
 320     long L = jd + 68569;
 321     long n = (4 * L) / 146097;
 322     long i, j;
 323
 324     L = L - (146097 * n + 3) / 4;
 325     i = (4000 * (L + 1)) / 1461001;
 326     L = L - (1461 * i) / 4 + 31;
 327     j = (80 * L) / 2447;
 328     *d = L - (2447 * j) / 80;
 329     L = j / 11;
 330     *m = j + 2 - (12 * L);
 331     *y = 100 * (n - 49) + i + L;
 332 }
 333
 334 #ifdef OPENSSL_TIME_TEST
 335
 336 # include <stdio.h>
 337
 338 /*
 339  * Time checking test code. Check times are identical for a wide range of
 340  * offsets. This should be run on a machine with 64 bit time_t or it will
 341  * trigger the very errors the routines fix.
 342  */
 343
 344 int main(int argc, char **argv)
 345 {
 346     long offset;
 347     for (offset = 0; offset < 1000000; offset++) {
 348         check_time(offset);
 349         check_time(-offset);
 350         check_time(offset * 1000);
 351         check_time(-offset * 1000);
 352     }
 353 }
 354
 355 int check_time(long offset)
 356 {
 357     struct tm tm1, tm2;
 358     time_t t1, t2;
 359     time(&t1);
 360     t2 = t1 + offset;
 361     OPENSSL_gmtime(&t2, &tm2);
 362     OPENSSL_gmtime(&t1, &tm1);
 363     OPENSSL_gmtime_adj(&tm1, 0, offset);
 364     if ((tm1.tm_year == tm2.tm_year) &&
 365         (tm1.tm_mon == tm2.tm_mon) &&
 366         (tm1.tm_mday == tm2.tm_mday) &&
 367         (tm1.tm_hour == tm2.tm_hour) &&
 368         (tm1.tm_min == tm2.tm_min) && (tm1.tm_sec == tm2.tm_sec))
 369         return 1;
 370     fprintf(stderr, "TIME ERROR!!\n");
 371     fprintf(stderr, "Time1: %d/%d/%d, %d:%02d:%02d\n",
 372             tm2.tm_mday, tm2.tm_mon + 1, tm2.tm_year + 1900,
 373             tm2.tm_hour, tm2.tm_min, tm2.tm_sec);
 374     fprintf(stderr, "Time2: %d/%d/%d, %d:%02d:%02d\n",
 375             tm1.tm_mday, tm1.tm_mon + 1, tm1.tm_year + 1900,
 376             tm1.tm_hour, tm1.tm_min, tm1.tm_sec);
 377     return 0;
 378 }
 379
 380 #endif