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 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 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 71 dns_time32_totext(uint32_t value, isc_buffer_t *target) { 72 return (dns_time64_totext(dns_time64_from32(value), target)); 73 } 74