1/*
2 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "krb5_locl.h"
35
36/**
37 * Set the absolute time that the caller knows the kdc has so the
38 * kerberos library can calculate the relative diffrence beteen the
39 * KDC time and local system time.
40 *
41 * @param context Keberos 5 context.
42 * @param sec The applications new of "now" in seconds
43 * @param usec The applications new of "now" in micro seconds
44
45 * @return Kerberos 5 error code, see krb5_get_error_message().
46 *
47 * @ingroup krb5
48 */
49
50KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
51krb5_set_real_time (krb5_context context,
52		    krb5_timestamp sec,
53		    int32_t usec)
54{
55    struct timeval tv;
56
57    gettimeofday(&tv, NULL);
58
59    context->kdc_sec_offset = (uint32_t)(sec - tv.tv_sec);
60
61    /**
62     * If the caller passes in a negative usec, its assumed to be
63     * unknown and the function will use the current time usec.
64     */
65    if (usec >= 0) {
66	context->kdc_usec_offset = usec - tv.tv_usec;
67
68	if (context->kdc_usec_offset < 0) {
69	    context->kdc_sec_offset--;
70	    context->kdc_usec_offset += 1000000;
71	}
72    } else
73	context->kdc_usec_offset = tv.tv_usec;
74
75    return 0;
76}
77
78/*
79 * return ``corrected'' time in `timeret'.
80 */
81
82KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
83krb5_timeofday (krb5_context context,
84		krb5_timestamp *timeret)
85{
86    *timeret = time(NULL);
87    if (context)
88	*timeret += context->kdc_sec_offset;
89    return 0;
90}
91
92/*
93 * like gettimeofday but with time correction to the KDC
94 */
95
96KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
97krb5_us_timeofday (krb5_context context,
98		   krb5_timestamp *sec,
99		   int32_t *usec)
100{
101    struct timeval tv;
102
103    gettimeofday (&tv, NULL);
104
105    *sec  = tv.tv_sec;
106    if (context)
107	*sec += context->kdc_sec_offset;
108    *usec = tv.tv_usec;
109    return 0;
110}
111
112KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
113krb5_format_time(krb5_context context, time_t t,
114		 char *s, size_t len, krb5_boolean include_time)
115{
116    struct tm *tm;
117    if(context->log_utc)
118	tm = gmtime (&t);
119    else
120	tm = localtime(&t);
121    if(tm == NULL ||
122       strftime(s, len, include_time ? context->time_fmt : context->date_fmt, tm) == 0)
123	snprintf(s, len, "%ld", (long)t);
124    return 0;
125}
126
127KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
128krb5_string_to_deltat(const char *string, krb5_deltat *deltat)
129{
130    if((*deltat = parse_time(string, "s")) == -1)
131	return KRB5_DELTAT_BADFORMAT;
132    return 0;
133}
134
135krb5_deltat
136krb5_time_abs(krb5_deltat t1, krb5_deltat t2)
137{
138    krb5_deltat t = t1 - t2;
139    if (t < 0)
140	return -t;
141    return t;
142}
143