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      1 /*	$NetBSD: time.c,v 1.2 2017/01/28 21:31:49 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997-2004 Kungliga Tekniska Hgskolan
      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