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

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1999-2001  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: ttl.c,v 1.29 2007/06/19 23:47:16 tbox Exp */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30
  31 #include <isc/buffer.h>
  32 #include <isc/parseint.h>
  33 #include <isc/print.h>
  34 #include <isc/region.h>
  35 #include <isc/string.h>
  36 #include <isc/util.h>
  37
  38 #include <dns/result.h>
  39 #include <dns/ttl.h>
  40
  41 #define RETERR(x) do { \
  42         isc_result_t _r = (x); \
  43         if (_r != ISC_R_SUCCESS) \
  44                 return (_r); \
  45         } while (0)
  46
  47
  48 static isc_result_t bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl);
  49
  50 /*
  51  * Helper for dns_ttl_totext().
  52  */
  53 static isc_result_t
  54 ttlfmt(unsigned int t, const char *s, isc_boolean_t verbose,
  55        isc_boolean_t space, isc_buffer_t *target)
  56 {
  57         char tmp[60];
  58         size_t len;
  59         isc_region_t region;
  60
  61         if (verbose)
  62                 len = snprintf(tmp, sizeof(tmp), "%s%u %s%s",
  63                                space ? " " : "",
  64                                t, s,
  65                                t == 1 ? "" : "s");
  66         else
  67                 len = snprintf(tmp, sizeof(tmp), "%u%c", t, s[0]);
  68
  69         INSIST(len + 1 <= sizeof(tmp));
  70         isc_buffer_availableregion(target, &region);
  71         if (len > region.length)
  72                 return (ISC_R_NOSPACE);
  73         memcpy(region.base, tmp, len);
  74         isc_buffer_add(target, len);
  75
  76         return (ISC_R_SUCCESS);
  77 }
  78
  79 /*
  80  * Derived from bind8 ns_format_ttl().
  81  */
  82 isc_result_t
  83 dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose, isc_buffer_t *target) {
  84         unsigned secs, mins, hours, days, weeks, x;
  85
  86         secs = src % 60;   src /= 60;
  87         mins = src % 60;   src /= 60;
  88         hours = src % 24;  src /= 24;
  89         days = src % 7;    src /= 7;
  90         weeks = src;       src = 0;
  91
  92         x = 0;
  93         if (weeks != 0) {
  94                 RETERR(ttlfmt(weeks, "week", verbose, ISC_TF(x > 0), target));
  95                 x++;
  96         }
  97         if (days != 0) {
  98                 RETERR(ttlfmt(days, "day", verbose, ISC_TF(x > 0), target));
  99                 x++;
 100         }
 101         if (hours != 0) {
 102                 RETERR(ttlfmt(hours, "hour", verbose, ISC_TF(x > 0), target));
 103                 x++;
 104         }
 105         if (mins != 0) {
 106                 RETERR(ttlfmt(mins, "minute", verbose, ISC_TF(x > 0), target));
 107                 x++;
 108         }
 109         if (secs != 0 ||
 110             (weeks == 0 && days == 0 && hours == 0 && mins == 0)) {
 111                 RETERR(ttlfmt(secs, "second", verbose, ISC_TF(x > 0), target));
 112                 x++;
 113         }
 114         INSIST (x > 0);
 115         /*
 116          * If only a single unit letter is printed, print it
 117          * in upper case. (Why?  Because BIND 8 does that.
 118          * Presumably it has a reason.)
 119          */
 120         if (x == 1 && !verbose) {
 121                 isc_region_t region;
 122                 /*
 123                  * The unit letter is the last character in the
 124                  * used region of the buffer.
 125                  *
 126                  * toupper() does not need its argument to be masked of cast
 127                  * here because region.base is type unsigned char *.
 128                  */
 129                 isc_buffer_usedregion(target, &region);
 130                 region.base[region.length - 1] =
 131                         toupper(region.base[region.length - 1]);
 132         }
 133         return (ISC_R_SUCCESS);
 134 }
 135
 136 isc_result_t
 137 dns_counter_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
 138         return (bind_ttl(source, ttl));
 139 }
 140
 141 isc_result_t
 142 dns_ttl_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
 143         isc_result_t result;
 144
 145         result = bind_ttl(source, ttl);
 146         if (result != ISC_R_SUCCESS)
 147                 result = DNS_R_BADTTL;
 148         return (result);
 149 }
 150
 151 static isc_result_t
 152 bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl) {
 153         isc_uint32_t tmp = 0;
 154         isc_uint32_t n;
 155         char *s;
 156         char buf[64];
 157         char nbuf[64]; /* Number buffer */
 158
 159         /*
 160          * Copy the buffer as it may not be NULL terminated.
 161          * No legal counter / ttl is longer that 63 characters.
 162          */
 163         if (source->length > sizeof(buf) - 1)
 164                 return (DNS_R_SYNTAX);
 165         strncpy(buf, source->base, source->length);
 166         buf[source->length] = '\0';
 167         s = buf;
 168
 169         do {
 170                 isc_result_t result;
 171
 172                 char *np = nbuf;
 173                 while (*s != '\0' && isdigit((unsigned char)*s))
 174                         *np++ = *s++;
 175                 *np++ = '\0';
 176                 INSIST(np - nbuf <= (int)sizeof(nbuf));
 177                 result = isc_parse_uint32(&n, nbuf, 10);
 178                 if (result != ISC_R_SUCCESS)
 179                         return (DNS_R_SYNTAX);
 180                 switch (*s) {
 181                 case 'w':
 182                 case 'W':
 183                         tmp += n * 7 * 24 * 3600;
 184                         s++;
 185                         break;
 186                 case 'd':
 187                 case 'D':
 188                         tmp += n * 24 * 3600;
 189                         s++;
 190                         break;
 191                 case 'h':
 192                 case 'H':
 193                         tmp += n * 3600;
 194                         s++;
 195                         break;
 196                 case 'm':
 197                 case 'M':
 198                         tmp += n * 60;
 199                         s++;
 200                         break;
 201                 case 's':
 202                 case 'S':
 203                         tmp += n;
 204                         s++;
 205                         break;
 206                 case '\0':
 207                         /* Plain number? */
 208                         if (tmp != 0)
 209                                 return (DNS_R_SYNTAX);
 210                         tmp = n;
 211                         break;
 212                 default:
 213                         return (DNS_R_SYNTAX);
 214                 }
 215         } while (*s != '\0');
 216         *ttl = tmp;
 217         return (ISC_R_SUCCESS);
 218 }