external/bsd/bind/dist/lib/dns/time.c

   1 /*      $NetBSD: time.c,v 1.6 2014/12/10 04:37:58 christos Exp $        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007, 2009-2012, 2014  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1998-2003  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <stdio.h>
  27 #include <isc/string.h>         /* Required for HP/UX (and others?) */
  28 #include <time.h>
  29 #include <ctype.h>
  30
  31 #include <isc/print.h>
  32 #include <isc/region.h>
  33 #include <isc/serial.h>
  34 #include <isc/stdtime.h>
  35 #include <isc/util.h>
  36
  37 #include <dns/result.h>
  38 #include <dns/time.h>
  39
  40 static const int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  41
  42 isc_result_t
  43 dns_time64_totext(isc_int64_t t, isc_buffer_t *target) {
  44         struct tm tm;
  45         char buf[sizeof("YYYYMMDDHHMMSS")];
  46         int secs;
  47         unsigned int l;
  48         isc_region_t region;
  49
  50 /*
  51  * Warning. Do NOT use arguments with side effects with these macros.
  52  */
  53 #define is_leap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  54 #define year_secs(y) ((is_leap(y) ? 366 : 365 ) * 86400)
  55 #define month_secs(m,y) ((days[m] + ((m == 1 && is_leap(y)) ? 1 : 0 )) * 86400)
  56
  57         tm.tm_year = 70;
  58         while (t < 0) {
  59                 if (tm.tm_year == 0)
  60                         return (ISC_R_RANGE);
  61                 tm.tm_year--;
  62                 secs = year_secs(tm.tm_year + 1900);
  63                 t += secs;
  64         }
  65         while ((secs = year_secs(tm.tm_year + 1900)) <= t) {
  66                 t -= secs;
  67                 tm.tm_year++;
  68                 if (tm.tm_year + 1900 > 9999)
  69                         return (ISC_R_RANGE);
  70         }
  71         tm.tm_mon = 0;
  72         while ((secs = month_secs(tm.tm_mon, tm.tm_year + 1900)) <= t) {
  73                 t -= secs;
  74                 tm.tm_mon++;
  75         }
  76         tm.tm_mday = 1;
  77         while (86400 <= t) {
  78                 t -= 86400;
  79                 tm.tm_mday++;
  80         }
  81         tm.tm_hour = 0;
  82         while (3600 <= t) {
  83                 t -= 3600;
  84                 tm.tm_hour++;
  85         }
  86         tm.tm_min = 0;
  87         while (60 <= t) {
  88                 t -= 60;
  89                 tm.tm_min++;
  90         }
  91         tm.tm_sec = (int)t;
  92                                  /* yyyy  mm  dd  HH  MM  SS */
  93         snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02d",
  94                  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
  95                  tm.tm_hour, tm.tm_min, tm.tm_sec);
  96
  97         isc_buffer_availableregion(target, &region);
  98         l = strlen(buf);
  99
 100         if (l > region.length)
 101                 return (ISC_R_NOSPACE);
 102
 103         memmove(region.base, buf, l);
 104         isc_buffer_add(target, l);
 105         return (ISC_R_SUCCESS);
 106 }
 107
 108 isc_int64_t
 109 dns_time64_from32(isc_uint32_t value) {
 110         isc_stdtime_t now;
 111         isc_int64_t start;
 112         isc_int64_t t;
 113
 114         /*
 115          * Adjust the time to the closest epoch.  This should be changed
 116          * to use a 64-bit counterpart to isc_stdtime_get() if one ever
 117          * is defined, but even the current code is good until the year
 118          * 2106.
 119          */
 120         isc_stdtime_get(&now);
 121         start = (isc_int64_t) now;
 122         if (isc_serial_gt(value, now))
 123                 t = start + (value - now);
 124         else
 125                 t = start - (now - value);
 126
 127         return (t);
 128 }
 129
 130 isc_result_t
 131 dns_time32_totext(isc_uint32_t value, isc_buffer_t *target) {
 132         return (dns_time64_totext(dns_time64_from32(value), target));
 133 }
 134
 135 isc_result_t
 136 dns_time64_fromtext(const char *source, isc_int64_t *target) {
 137         int year, month, day, hour, minute, second;
 138         isc_int64_t value;
 139         int secs;
 140         int i;
 141
 142 #define RANGE(min, max, value) \
 143         do { \
 144                 if (value < (min) || value > (max)) \
 145                         return (ISC_R_RANGE); \
 146         } while (/*CONSTCOND*/0)
 147
 148         if (strlen(source) != 14U)
 149                 return (DNS_R_SYNTAX);
 150         /*
 151          * Confirm the source only consists digits.  sscanf() allows some
 152          * minor exceptions.
 153          */
 154         for (i = 0; i < 14; i++) {
 155                 if (!isdigit((unsigned char)source[i]))
 156                         return (DNS_R_SYNTAX);
 157         }
 158         if (sscanf(source, "%4d%2d%2d%2d%2d%2d",
 159                    &year, &month, &day, &hour, &minute, &second) != 6)
 160                 return (DNS_R_SYNTAX);
 161
 162         RANGE(0, 9999, year);
 163         RANGE(1, 12, month);
 164         RANGE(1, days[month - 1] +
 165                  ((month == 2 && is_leap(year)) ? 1 : 0), day);
 166 #ifdef __COVERITY__
 167         /*
 168          * Use a simplified range to silence Coverity warning (in
 169          * arithmetic with day below).
 170          */
 171         RANGE(1, 31, day);
 172 #endif /* __COVERITY__ */
 173
 174         RANGE(0, 23, hour);
 175         RANGE(0, 59, minute);
 176         RANGE(0, 60, second);           /* 60 == leap second. */
 177
 178         /*
 179          * Calculate seconds from epoch.
 180          * Note: this uses a idealized calendar.
 181          */
 182         value = second + (60 * minute) + (3600 * hour) + ((day - 1) * 86400);
 183         for (i = 0; i < (month - 1); i++)
 184                 value += days[i] * 86400;
 185         if (is_leap(year) && month > 2)
 186                 value += 86400;
 187         if (year < 1970) {
 188                 for (i = 1969; i >= year; i--) {
 189                         secs = (is_leap(i) ? 366 : 365) * 86400;
 190                         value -= secs;
 191                 }
 192         } else {
 193                 for (i = 1970; i < year; i++) {
 194                         secs = (is_leap(i) ? 366 : 365) * 86400;
 195                         value += secs;
 196                 }
 197         }
 198
 199         *target = value;
 200         return (ISC_R_SUCCESS);
 201 }
 202
 203 isc_result_t
 204 dns_time32_fromtext(const char *source, isc_uint32_t *target) {
 205         isc_int64_t value64;
 206         isc_result_t result;
 207         result = dns_time64_fromtext(source, &value64);
 208         if (result != ISC_R_SUCCESS)
 209                 return (result);
 210         *target = (isc_uint32_t)value64;
 211
 212         return (ISC_R_SUCCESS);
 213 }