contrib/bind-9.2.4rc7/lib/dns/ttl.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: ttl.c,v 1.21.2.1 2004/03/09 06:11:09 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <ctype.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25
  26 #include <isc/buffer.h>
  27 #include <isc/print.h>
  28 #include <isc/region.h>
  29 #include <isc/string.h>
  30 #include <isc/util.h>
  31
  32 #include <dns/result.h>
  33 #include <dns/ttl.h>
  34
  35 #define RETERR(x) do { \
  36         isc_result_t _r = (x); \
  37         if (_r != ISC_R_SUCCESS) \
  38                 return (_r); \
  39         } while (0)
  40
  41
  42 static isc_result_t bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl);
  43
  44 /*
  45  * Helper for dns_ttl_totext().
  46  */
  47 static isc_result_t
  48 ttlfmt(unsigned int t, const char *s, isc_boolean_t verbose,
  49        isc_boolean_t space, isc_buffer_t *target)
  50 {
  51         char tmp[60];
  52         size_t len;
  53         isc_region_t region;
  54
  55         if (verbose)
  56                 len = snprintf(tmp, sizeof(tmp), "%s%u %s%s",
  57                                space ? " " : "",
  58                                t, s,
  59                                t == 1 ? "" : "s");
  60         else
  61                 len = snprintf(tmp, sizeof(tmp), "%u%c", t, s[0]);
  62
  63         INSIST(len + 1 <= sizeof tmp);
  64         isc_buffer_availableregion(target, &region);
  65         if (len > region.length)
  66                 return (ISC_R_NOSPACE);
  67         memcpy(region.base, tmp, len);
  68         isc_buffer_add(target, len);
  69
  70         return (ISC_R_SUCCESS);
  71 }
  72
  73 /*
  74  * Derived from bind8 ns_format_ttl().
  75  */
  76 isc_result_t
  77 dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose, isc_buffer_t *target) {
  78         unsigned secs, mins, hours, days, weeks, x;
  79
  80         secs = src % 60;   src /= 60;
  81         mins = src % 60;   src /= 60;
  82         hours = src % 24;  src /= 24;
  83         days = src % 7;    src /= 7;
  84         weeks = src;       src = 0;
  85
  86         x = 0;
  87         if (weeks != 0) {
  88                 RETERR(ttlfmt(weeks, "week", verbose, ISC_TF(x > 0), target));
  89                 x++;
  90         }
  91         if (days != 0) {
  92                 RETERR(ttlfmt(days, "day", verbose, ISC_TF(x > 0), target));
  93                 x++;
  94         }
  95         if (hours != 0) {
  96                 RETERR(ttlfmt(hours, "hour", verbose, ISC_TF(x > 0), target));
  97                 x++;
  98         }
  99         if (mins != 0) {
 100                 RETERR(ttlfmt(mins, "minute", verbose, ISC_TF(x > 0), target));
 101                 x++;
 102         }
 103         if (secs != 0 ||
 104             (weeks == 0 && days == 0 && hours == 0 && mins == 0)) {
 105                 RETERR(ttlfmt(secs, "second", verbose, ISC_TF(x > 0), target));
 106                 x++;
 107         }
 108         INSIST (x > 0);
 109         /*
 110          * If only a single unit letter is printed, print it
 111          * in upper case. (Why?  Because BIND 8 does that.
 112          * Presumably it has a reason.)
 113          */
 114         if (x == 1 && !verbose) {
 115                 isc_region_t region;
 116                 /*
 117                  * The unit letter is the last character in the
 118                  * used region of the buffer.
 119                  *
 120                  * toupper() does not need its argument to be masked of cast
 121                  * here because region.base is type unsigned char *.
 122                  */
 123                 isc_buffer_usedregion(target, &region);
 124                 region.base[region.length - 1] =
 125                         toupper(region.base[region.length - 1]);
 126         }
 127         return (ISC_R_SUCCESS);
 128 }
 129
 130 isc_result_t
 131 dns_counter_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
 132         return (bind_ttl(source, ttl));
 133 }
 134
 135 isc_result_t
 136 dns_ttl_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
 137         isc_result_t result;
 138
 139         result = bind_ttl(source, ttl);
 140         if (result != ISC_R_SUCCESS)
 141                 result = DNS_R_BADTTL;
 142         return (result);
 143 }
 144
 145 static isc_result_t
 146 bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl) {
 147         isc_uint32_t tmp = 0;
 148         unsigned long n;
 149         char *e, *s;
 150         char buf[64];
 151
 152         /*
 153          * Copy the buffer as it may not be NULL terminated.
 154          * No legal counter / ttl is longer that 63 characters.
 155          */
 156         if (source->length > sizeof(buf) - 1)
 157                 return(DNS_R_SYNTAX);
 158         strncpy(buf, source->base, source->length);
 159         buf[source->length] = '\0';
 160         s = buf;
 161
 162         do {
 163                 n = strtoul(s, &e, 10);
 164                 if (s == e)
 165                         return (DNS_R_SYNTAX);
 166                 switch (*e) {
 167                 case 'w':
 168                 case 'W':
 169                         tmp += n * 7 * 24 * 3600;
 170                         s = e + 1;
 171                         break;
 172                 case 'd':
 173                 case 'D':
 174                         tmp += n * 24 * 3600;
 175                         s = e + 1;
 176                         break;
 177                 case 'h':
 178                 case 'H':
 179                         tmp += n * 3600;
 180                         s = e + 1;
 181                         break;
 182                 case 'm':
 183                 case 'M':
 184                         tmp += n * 60;
 185                         s = e + 1;
 186                         break;
 187                 case 's':
 188                 case 'S':
 189                         tmp += n;
 190                         s = e + 1;
 191                         break;
 192                 case '\0':
 193                         /* Plain number? */
 194                         if (tmp != 0)
 195                                 return (DNS_R_SYNTAX);
 196                         tmp = n;
 197                         s = e;
 198                         break;
 199                 default:
 200                         return (DNS_R_SYNTAX);
 201                 }
 202         } while (*s != 0);
 203         *ttl = tmp;
 204         return (ISC_R_SUCCESS);
 205 }