crypto/external/bsd/heimdal/dist/lib/krb5/time.c

   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 }