1/*
2 * Copyright (C) 2004, 2005, 2007, 2009-2012  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1998-2003  Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id$ */
19
20/*! \file */
21
22#include <config.h>
23
24#include <stdio.h>
25#include <isc/string.h>		/* Required for HP/UX (and others?) */
26#include <time.h>
27#include <ctype.h>
28
29#include <isc/print.h>
30#include <isc/region.h>
31#include <isc/serial.h>
32#include <isc/stdtime.h>
33#include <isc/util.h>
34
35#include <dns/result.h>
36#include <dns/time.h>
37
38static int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
39
40isc_result_t
41dns_time64_totext(isc_int64_t t, isc_buffer_t *target) {
42	struct tm tm;
43	char buf[sizeof("YYYYMMDDHHMMSS")];
44	int secs;
45	unsigned int l;
46	isc_region_t region;
47
48/*
49 * Warning. Do NOT use arguments with side effects with these macros.
50 */
51#define is_leap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
52#define year_secs(y) ((is_leap(y) ? 366 : 365 ) * 86400)
53#define month_secs(m,y) ((days[m] + ((m == 1 && is_leap(y)) ? 1 : 0 )) * 86400)
54
55	tm.tm_year = 70;
56	while (t < 0) {
57		if (tm.tm_year == 0)
58			return (ISC_R_RANGE);
59		tm.tm_year--;
60		secs = year_secs(tm.tm_year + 1900);
61		t += secs;
62	}
63	while ((secs = year_secs(tm.tm_year + 1900)) <= t) {
64		t -= secs;
65		tm.tm_year++;
66		if (tm.tm_year + 1900 > 9999)
67			return (ISC_R_RANGE);
68	}
69	tm.tm_mon = 0;
70	while ((secs = month_secs(tm.tm_mon, tm.tm_year + 1900)) <= t) {
71		t -= secs;
72		tm.tm_mon++;
73	}
74	tm.tm_mday = 1;
75	while (86400 <= t) {
76		t -= 86400;
77		tm.tm_mday++;
78	}
79	tm.tm_hour = 0;
80	while (3600 <= t) {
81		t -= 3600;
82		tm.tm_hour++;
83	}
84	tm.tm_min = 0;
85	while (60 <= t) {
86		t -= 60;
87		tm.tm_min++;
88	}
89	tm.tm_sec = (int)t;
90				 /* yyyy  mm  dd  HH  MM  SS */
91	snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02d",
92		 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
93		 tm.tm_hour, tm.tm_min, tm.tm_sec);
94
95	isc_buffer_availableregion(target, &region);
96	l = strlen(buf);
97
98	if (l > region.length)
99		return (ISC_R_NOSPACE);
100
101	memcpy(region.base, buf, l);
102	isc_buffer_add(target, l);
103	return (ISC_R_SUCCESS);
104}
105
106isc_int64_t
107dns_time64_from32(isc_uint32_t value) {
108	isc_stdtime_t now;
109	isc_int64_t start;
110	isc_int64_t t;
111
112	/*
113	 * Adjust the time to the closest epoch.  This should be changed
114	 * to use a 64-bit counterpart to isc_stdtime_get() if one ever
115	 * is defined, but even the current code is good until the year
116	 * 2106.
117	 */
118	isc_stdtime_get(&now);
119	start = (isc_int64_t) now;
120	if (isc_serial_gt(value, now))
121		t = start + (value - now);
122	else
123		t = start - (now - value);
124
125	return (t);
126}
127
128isc_result_t
129dns_time32_totext(isc_uint32_t value, isc_buffer_t *target) {
130	return (dns_time64_totext(dns_time64_from32(value), target));
131}
132
133isc_result_t
134dns_time64_fromtext(const char *source, isc_int64_t *target) {
135	int year, month, day, hour, minute, second;
136	isc_int64_t value;
137	int secs;
138	int i;
139
140#define RANGE(min, max, value) \
141	do { \
142		if (value < (min) || value > (max)) \
143			return (ISC_R_RANGE); \
144	} while (0)
145
146	if (strlen(source) != 14U)
147		return (DNS_R_SYNTAX);
148	/*
149	 * Confirm the source only consists digits.  sscanf() allows some
150	 * minor exceptions.
151	 */
152	for (i = 0; i < 14; i++) {
153		if (!isdigit((unsigned char)source[i]))
154			return (DNS_R_SYNTAX);
155	}
156	if (sscanf(source, "%4d%2d%2d%2d%2d%2d",
157		   &year, &month, &day, &hour, &minute, &second) != 6)
158		return (DNS_R_SYNTAX);
159
160	RANGE(0, 9999, year);
161	RANGE(1, 12, month);
162	RANGE(1, days[month - 1] +
163		 ((month == 2 && is_leap(year)) ? 1 : 0), day);
164	RANGE(0, 23, hour);
165	RANGE(0, 59, minute);
166	RANGE(0, 60, second);		/* 60 == leap second. */
167
168	/*
169	 * Calculate seconds from epoch.
170	 * Note: this uses a idealized calendar.
171	 */
172	value = second + (60 * minute) + (3600 * hour) + ((day - 1) * 86400);
173	for (i = 0; i < (month - 1); i++)
174		value += days[i] * 86400;
175	if (is_leap(year) && month > 2)
176		value += 86400;
177	if (year < 1970) {
178		for (i = 1969; i >= year; i--) {
179			secs = (is_leap(i) ? 366 : 365) * 86400;
180			value -= secs;
181		}
182	} else {
183		for (i = 1970; i < year; i++) {
184			secs = (is_leap(i) ? 366 : 365) * 86400;
185			value += secs;
186		}
187	}
188
189	*target = value;
190	return (ISC_R_SUCCESS);
191}
192
193isc_result_t
194dns_time32_fromtext(const char *source, isc_uint32_t *target) {
195	isc_int64_t value64;
196	isc_result_t result;
197	result = dns_time64_fromtext(source, &value64);
198	if (result != ISC_R_SUCCESS)
199		return (result);
200	*target = (isc_uint32_t)value64;
201
202	return (ISC_R_SUCCESS);
203}
204