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/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <time.h>
#include "knot/conf/conf.h"
#include "knot/zone/serial.h"
static const serial_cmp_result_t diffbrief2result[4] = {
[0] = SERIAL_EQUAL,
[1] = SERIAL_GREATER,
[2] = SERIAL_INCOMPARABLE,
[3] = SERIAL_LOWER,
};
serial_cmp_result_t serial_compare(uint32_t s1, uint32_t s2)
{
uint64_t diff = ((uint64_t)s1 + ((uint64_t)1 << 32) - s2) & 0xffffffff;
int diffbrief = (diff >> 31 << 1) | ((diff & 0x7fffffff) ? 1 : 0);
assert(diffbrief > -1 && diffbrief < 4);
return diffbrief2result[diffbrief];
}
static uint32_t serial_dateserial(uint32_t current)
{
struct tm now;
time_t current_time = time(NULL);
struct tm *gmtime_result = gmtime_r(¤t_time, &now);
if (gmtime_result == NULL) {
return current;
}
return (1900 + now.tm_year) * 1000000 +
( 1 + now.tm_mon ) * 10000 +
( now.tm_mday) * 100;
}
uint32_t serial_next(uint32_t current, int policy, uint32_t must_increment)
{
uint32_t minimum;
switch (policy) {
case SERIAL_POLICY_INCREMENT:
minimum = current;
break;
case SERIAL_POLICY_UNIXTIME:
minimum = time(NULL);
break;
case SERIAL_POLICY_DATESERIAL:
minimum = serial_dateserial(current);
break;
default:
assert(0);
return 0;
}
if (serial_compare(minimum, current) != SERIAL_GREATER) {
return current + must_increment;
} else {
return minimum;
}
}
serial_cmp_result_t kserial_cmp(kserial_t a, kserial_t b)
{
return ((a.valid && b.valid) ? serial_compare(a.serial, b.serial) : SERIAL_INCOMPARABLE);
}
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