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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 <inttypes.h>
#include <stdio.h>
#include <time.h>
#include <isc/print.h>
#include <isc/region.h>
#include <isc/result.h>
#include <isc/serial.h>
#include <isc/stdtime.h>
#include <isc/string.h> /* Required for HP/UX (and others?) */
#include <isc/util.h>
#include <dns/time.h>
static const int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
isc_result_t
dns_time64_totext(int64_t t, isc_buffer_t *target) {
struct tm tm;
char buf[sizeof("!!!!!!YYYY!!!!!!!!MM!!!!!!!!DD!!!!!!!!HH!!!!!!!!MM!!!!"
"!!!!SS")];
int secs;
unsigned int l;
isc_region_t region;
/*
* Warning. Do NOT use arguments with side effects with these macros.
*/
#define is_leap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
#define year_secs(y) ((is_leap(y) ? 366 : 365) * 86400)
#define month_secs(m, y) ((days[m] + ((m == 1 && is_leap(y)) ? 1 : 0)) * 86400)
tm.tm_year = 70;
while (t < 0) {
if (tm.tm_year == 0) {
return (ISC_R_RANGE);
}
tm.tm_year--;
secs = year_secs(tm.tm_year + 1900);
t += secs;
}
while ((secs = year_secs(tm.tm_year + 1900)) <= t) {
t -= secs;
tm.tm_year++;
if (tm.tm_year + 1900 > 9999) {
return (ISC_R_RANGE);
}
}
tm.tm_mon = 0;
while ((secs = month_secs(tm.tm_mon, tm.tm_year + 1900)) <= t) {
t -= secs;
tm.tm_mon++;
}
tm.tm_mday = 1;
while (86400 <= t) {
t -= 86400;
tm.tm_mday++;
}
tm.tm_hour = 0;
while (3600 <= t) {
t -= 3600;
tm.tm_hour++;
}
tm.tm_min = 0;
while (60 <= t) {
t -= 60;
tm.tm_min++;
}
tm.tm_sec = (int)t;
/* yyyy mm dd HH MM SS */
snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02d",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
tm.tm_min, tm.tm_sec);
isc_buffer_availableregion(target, ®ion);
l = strlen(buf);
if (l > region.length) {
return (ISC_R_NOSPACE);
}
memmove(region.base, buf, l);
isc_buffer_add(target, l);
return (ISC_R_SUCCESS);
}
int64_t
dns_time64_from32(uint32_t value) {
isc_stdtime_t now;
int64_t start;
int64_t t;
/*
* Adjust the time to the closest epoch. This should be changed
* to use a 64-bit counterpart to isc_stdtime_get() if one ever
* is defined, but even the current code is good until the year
* 2106.
*/
isc_stdtime_get(&now);
start = (int64_t)now;
if (isc_serial_gt(value, now)) {
t = start + (value - now);
} else {
t = start - (now - value);
}
return (t);
}
isc_result_t
dns_time32_totext(uint32_t value, isc_buffer_t *target) {
return (dns_time64_totext(dns_time64_from32(value), target));
}
isc_result_t
dns_time64_fromtext(const char *source, int64_t *target) {
int year, month, day, hour, minute, second;
int64_t value;
int secs;
int i;
#define RANGE(min, max, value) \
do { \
if (value < (min) || value > (max)) \
return ((ISC_R_RANGE)); \
} while (0)
if (strlen(source) != 14U) {
return (DNS_R_SYNTAX);
}
/*
* Confirm the source only consists digits. sscanf() allows some
* minor exceptions.
*/
for (i = 0; i < 14; i++) {
if (!isdigit((unsigned char)source[i])) {
return (DNS_R_SYNTAX);
}
}
if (sscanf(source, "%4d%2d%2d%2d%2d%2d", &year, &month, &day, &hour,
&minute, &second) != 6)
{
return (DNS_R_SYNTAX);
}
RANGE(0, 9999, year);
RANGE(1, 12, month);
RANGE(1, days[month - 1] + ((month == 2 && is_leap(year)) ? 1 : 0),
day);
#ifdef __COVERITY__
/*
* Use a simplified range to silence Coverity warning (in
* arithmetic with day below).
*/
RANGE(1, 31, day);
#endif /* __COVERITY__ */
RANGE(0, 23, hour);
RANGE(0, 59, minute);
RANGE(0, 60, second); /* 60 == leap second. */
/*
* Calculate seconds from epoch.
* Note: this uses a idealized calendar.
*/
value = second + (60 * minute) + (3600 * hour) + ((day - 1) * 86400);
for (i = 0; i < (month - 1); i++) {
value += days[i] * 86400;
}
if (is_leap(year) && month > 2) {
value += 86400;
}
if (year < 1970) {
for (i = 1969; i >= year; i--) {
secs = (is_leap(i) ? 366 : 365) * 86400;
value -= secs;
}
} else {
for (i = 1970; i < year; i++) {
secs = (is_leap(i) ? 366 : 365) * 86400;
value += secs;
}
}
*target = value;
return (ISC_R_SUCCESS);
}
isc_result_t
dns_time32_fromtext(const char *source, uint32_t *target) {
int64_t value64;
isc_result_t result;
result = dns_time64_fromtext(source, &value64);
if (result != ISC_R_SUCCESS) {
return (result);
}
*target = (uint32_t)value64;
return (ISC_R_SUCCESS);
}
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