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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <isc/buffer.h>
#include <isc/parseint.h>
#include <isc/print.h>
#include <isc/region.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/util.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, uint32_t *ttl);
/*
* Helper for dns_ttl_totext().
*/
static isc_result_t
ttlfmt(unsigned int t, const char *s, bool verbose, bool 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(uint32_t src, bool verbose, bool upcase, 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, (x > 0), target));
x++;
}
if (days != 0) {
RETERR(ttlfmt(days, "day", verbose, (x > 0), target));
x++;
}
if (hours != 0) {
RETERR(ttlfmt(hours, "hour", verbose, (x > 0), target));
x++;
}
if (mins != 0) {
RETERR(ttlfmt(mins, "minute", verbose, (x > 0), target));
x++;
}
if (secs != 0 || (weeks == 0 && days == 0 && hours == 0 && mins == 0)) {
RETERR(ttlfmt(secs, "second", verbose, (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 && upcase && !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, uint32_t *ttl) {
return (bind_ttl(source, ttl));
}
isc_result_t
dns_ttl_fromtext(isc_textregion_t *source, 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, uint32_t *ttl) {
uint64_t tmp = 0ULL;
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 += (uint64_t)n * 7 * 24 * 3600;
s++;
break;
case 'd':
case 'D':
tmp += (uint64_t)n * 24 * 3600;
s++;
break;
case 'h':
case 'H':
tmp += (uint64_t)n * 3600;
s++;
break;
case 'm':
case 'M':
tmp += (uint64_t)n * 60;
s++;
break;
case 's':
case 'S':
tmp += (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 = (uint32_t)(tmp & 0xffffffffUL);
return (ISC_R_SUCCESS);
}
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