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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: ttl.c,v 1.9 2020/01/09 13:47:13 florian Exp $ */
/*! \file */
#include <config.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <isc/buffer.h>
#include <isc/parseint.h>
#include <isc/region.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/result.h>
#include <dns/ttl.h>
#define RETERR(x) do { \
isc_result_t _r = (x); \
if (_r != ISC_R_SUCCESS) \
return (_r); \
} while (0)
static isc_result_t bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl);
/*
* Helper for dns_ttl_totext().
*/
static isc_result_t
ttlfmt(unsigned int t, const char *s, isc_boolean_t verbose,
isc_boolean_t space, isc_buffer_t *target)
{
char tmp[60];
unsigned int len;
isc_region_t region;
if (verbose)
len = snprintf(tmp, sizeof(tmp), "%s%u %s%s",
space ? " " : "",
t, s,
t == 1 ? "" : "s");
else
len = snprintf(tmp, sizeof(tmp), "%u%c", t, s[0]);
INSIST(len + 1 <= sizeof(tmp));
isc_buffer_availableregion(target, ®ion);
if (len > region.length)
return (ISC_R_NOSPACE);
memmove(region.base, tmp, len);
isc_buffer_add(target, len);
return (ISC_R_SUCCESS);
}
/*
* Derived from bind8 ns_format_ttl().
*/
isc_result_t
dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose, isc_buffer_t *target) {
unsigned secs, mins, hours, days, weeks, x;
secs = src % 60; src /= 60;
mins = src % 60; src /= 60;
hours = src % 24; src /= 24;
days = src % 7; src /= 7;
weeks = src; src = 0;
POST(src);
x = 0;
if (weeks != 0) {
RETERR(ttlfmt(weeks, "week", verbose, ISC_TF(x > 0), target));
x++;
}
if (days != 0) {
RETERR(ttlfmt(days, "day", verbose, ISC_TF(x > 0), target));
x++;
}
if (hours != 0) {
RETERR(ttlfmt(hours, "hour", verbose, ISC_TF(x > 0), target));
x++;
}
if (mins != 0) {
RETERR(ttlfmt(mins, "minute", verbose, ISC_TF(x > 0), target));
x++;
}
if (secs != 0 ||
(weeks == 0 && days == 0 && hours == 0 && mins == 0)) {
RETERR(ttlfmt(secs, "second", verbose, ISC_TF(x > 0), target));
x++;
}
INSIST (x > 0);
/*
* If only a single unit letter is printed, print it
* in upper case. (Why? Because BIND 8 does that.
* Presumably it has a reason.)
*/
if (x == 1 && !verbose) {
isc_region_t region;
/*
* The unit letter is the last character in the
* used region of the buffer.
*
* toupper() does not need its argument to be masked of cast
* here because region.base is type unsigned char *.
*/
isc_buffer_usedregion(target, ®ion);
region.base[region.length - 1] =
toupper(region.base[region.length - 1]);
}
return (ISC_R_SUCCESS);
}
isc_result_t
dns_counter_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
return (bind_ttl(source, ttl));
}
isc_result_t
dns_ttl_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
isc_result_t result;
result = bind_ttl(source, ttl);
if (result != ISC_R_SUCCESS && result != ISC_R_RANGE)
result = DNS_R_BADTTL;
return (result);
}
static isc_result_t
bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl) {
isc_uint64_t tmp = 0ULL;
isc_uint32_t n;
char *s;
char buf[64];
char nbuf[64]; /* Number buffer */
/*
* Copy the buffer as it may not be NULL terminated.
* No legal counter / ttl is longer that 63 characters.
*/
if (source->length > sizeof(buf) - 1)
return (DNS_R_SYNTAX);
/* Copy source->length bytes and NUL terminate. */
snprintf(buf, sizeof(buf), "%.*s", (int)source->length, source->base);
s = buf;
do {
isc_result_t result;
char *np = nbuf;
while (*s != '\0' && isdigit((unsigned char)*s))
*np++ = *s++;
*np++ = '\0';
INSIST(np - nbuf <= (int)sizeof(nbuf));
result = isc_parse_uint32(&n, nbuf, 10);
if (result != ISC_R_SUCCESS)
return (DNS_R_SYNTAX);
switch (*s) {
case 'w':
case 'W':
tmp += (isc_uint64_t) n * 7 * 24 * 3600;
s++;
break;
case 'd':
case 'D':
tmp += (isc_uint64_t) n * 24 * 3600;
s++;
break;
case 'h':
case 'H':
tmp += (isc_uint64_t) n * 3600;
s++;
break;
case 'm':
case 'M':
tmp += (isc_uint64_t) n * 60;
s++;
break;
case 's':
case 'S':
tmp += (isc_uint64_t) n;
s++;
break;
case '\0':
/* Plain number? */
if (tmp != 0ULL)
return (DNS_R_SYNTAX);
tmp = n;
break;
default:
return (DNS_R_SYNTAX);
}
} while (*s != '\0');
if (tmp > 0xffffffffULL)
return (ISC_R_RANGE);
*ttl = (isc_uint32_t)(tmp & 0xffffffffUL);
return (ISC_R_SUCCESS);
}
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