1 /*
2 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 /* $Id: dns_time.c,v 1.7 2020/04/02 16:57:45 florian Exp $ */
18
19 /*! \file */
20
21 #include <stdio.h>
22 #include <string.h>
23 #include <time.h>
24
25 #include <isc/region.h>
26 #include <isc/serial.h>
27 #include <isc/result.h>
28
29 #include <dns/time.h>
30
31 static isc_result_t
dns_time64_totext(time_t t,isc_buffer_t * target)32 dns_time64_totext(time_t t, isc_buffer_t *target) {
33 struct tm *tm;
34 char buf[sizeof("YYYYMMDDHHMMSS")];
35 size_t l;
36 isc_region_t region;
37
38 tm = gmtime(&t);
39 if ((l = strftime(buf, sizeof(buf), "%Y%m%d%H%M%S", tm)) == 0)
40 return (ISC_R_NOSPACE);
41
42 isc_buffer_availableregion(target, ®ion);
43
44 if (l > region.length)
45 return (ISC_R_NOSPACE);
46
47 memmove(region.base, buf, l);
48 isc_buffer_add(target, l);
49 return (ISC_R_SUCCESS);
50 }
51
52 static time_t
dns_time64_from32(uint32_t value)53 dns_time64_from32(uint32_t value) {
54 uint32_t now32;
55 time_t start;
56 time_t t;
57
58 time(&start);
59 now32 = (uint32_t) start;
60
61 /* Adjust the time to the closest epoch. */
62 if (isc_serial_gt(value, now32))
63 t = start + (value - now32);
64 else
65 t = start - (now32 - value);
66
67 return (t);
68 }
69
70 isc_result_t
dns_time32_totext(uint32_t value,isc_buffer_t * target)71 dns_time32_totext(uint32_t value, isc_buffer_t *target) {
72 return (dns_time64_totext(dns_time64_from32(value), target));
73 }
74