1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* 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_next_date(uint32_t current)
{
uint32_t next = current + 1;
struct tm now;
time_t current_time = time(NULL);
struct tm *gmtime_result = gmtime_r(¤t_time, &now);
if (gmtime_result == NULL) {
return next;
}
uint32_t yyyyMMdd00 = (1900 + now.tm_year) * 1000000 +
( 1 + now.tm_mon ) * 10000 +
( now.tm_mday) * 100;
if (next < yyyyMMdd00) {
next = yyyyMMdd00;
}
return next;
}
uint32_t serial_next(uint32_t current, int policy)
{
uint32_t candidate;
switch (policy) {
case SERIAL_POLICY_INCREMENT:
return current + 1;
case SERIAL_POLICY_UNIXTIME:
candidate = time(NULL);
if (serial_compare(candidate, current) != SERIAL_GREATER) {
return current + 1;
} else {
return candidate;
}
case SERIAL_POLICY_DATESERIAL:
return serial_next_date(current);
default:
assert(0);
return 0;
}
}
bool serial_must_increment(uint32_t current, int policy)
{
switch (policy) {
case SERIAL_POLICY_INCREMENT:
return false;
case SERIAL_POLICY_UNIXTIME:
return true;
case SERIAL_POLICY_DATESERIAL:
// Trim off the serial parts from YYYYMMDDnn.
return (current / 100) < (serial_next_date(current) / 100);
default:
assert(0);
return false;
}
}
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);
}
|
