1 /*	$NetBSD: time.c,v 1.1.1.1 2011/04/13 18:15:38 elric Exp $	*/
2 
3 /*
4  * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
5  * (Royal Institute of Technology, Stockholm, Sweden).
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * 3. Neither the name of the Institute nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include "krb5_locl.h"
37 
38 /**
39  * Set the absolute time that the caller knows the kdc has so the
40  * kerberos library can calculate the relative diffrence beteen the
41  * KDC time and local system time.
42  *
43  * @param context Keberos 5 context.
44  * @param sec The applications new of "now" in seconds
45  * @param usec The applications new of "now" in micro seconds
46 
47  * @return Kerberos 5 error code, see krb5_get_error_message().
48  *
49  * @ingroup krb5
50  */
51 
52 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
53 krb5_set_real_time (krb5_context context,
54 		    krb5_timestamp sec,
55 		    int32_t usec)
56 {
57     struct timeval tv;
58 
59     gettimeofday(&tv, NULL);
60 
61     context->kdc_sec_offset = sec - tv.tv_sec;
62 
63     /**
64      * If the caller passes in a negative usec, its assumed to be
65      * unknown and the function will use the current time usec.
66      */
67     if (usec >= 0) {
68 	context->kdc_usec_offset = usec - tv.tv_usec;
69 
70 	if (context->kdc_usec_offset < 0) {
71 	    context->kdc_sec_offset--;
72 	    context->kdc_usec_offset += 1000000;
73 	}
74     } else
75 	context->kdc_usec_offset = tv.tv_usec;
76 
77     return 0;
78 }
79 
80 /*
81  * return ``corrected'' time in `timeret'.
82  */
83 
84 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
85 krb5_timeofday (krb5_context context,
86 		krb5_timestamp *timeret)
87 {
88     *timeret = time(NULL) + context->kdc_sec_offset;
89     return 0;
90 }
91 
92 /*
93  * like gettimeofday but with time correction to the KDC
94  */
95 
96 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
97 krb5_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 + context->kdc_sec_offset;
106     *usec = tv.tv_usec;		/* XXX */
107     return 0;
108 }
109 
110 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
111 krb5_format_time(krb5_context context, time_t t,
112 		 char *s, size_t len, krb5_boolean include_time)
113 {
114     struct tm *tm;
115     if(context->log_utc)
116 	tm = gmtime (&t);
117     else
118 	tm = localtime(&t);
119     if(tm == NULL ||
120        strftime(s, len, include_time ? context->time_fmt : context->date_fmt, tm) == 0)
121 	snprintf(s, len, "%ld", (long)t);
122     return 0;
123 }
124 
125 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
126 krb5_string_to_deltat(const char *string, krb5_deltat *deltat)
127 {
128     if((*deltat = parse_time(string, "s")) == -1)
129 	return KRB5_DELTAT_BADFORMAT;
130     return 0;
131 }
132