lib/krb5/time.c

   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
  50 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  51 krb5_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 = 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
  82 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  83 krb5_timeofday (krb5_context context,
  84                 krb5_timestamp *timeret)
  85 {
  86     *timeret = time(NULL) + context->kdc_sec_offset;
  87     return 0;
  88 }
  89
  90 /*
  91  * like gettimeofday but with time correction to the KDC
  92  */
  93
  94 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  95 krb5_us_timeofday (krb5_context context,
  96                    krb5_timestamp *sec,
  97                    int32_t *usec)
  98 {
  99     struct timeval tv;
 100
 101     gettimeofday (&tv, NULL);
 102
 103     *sec  = tv.tv_sec + context->kdc_sec_offset;
 104     *usec = tv.tv_usec;         /* XXX */
 105     return 0;
 106 }
 107
 108 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 109 krb5_format_time(krb5_context context, time_t t,
 110                  char *s, size_t len, krb5_boolean include_time)
 111 {
 112     struct tm *tm;
 113     if(context->log_utc)
 114         tm = gmtime (&t);
 115     else
 116         tm = localtime(&t);
 117     if(tm == NULL ||
 118        strftime(s, len, include_time ? context->time_fmt : context->date_fmt, tm) == 0)
 119         snprintf(s, len, "%ld", (long)t);
 120     return 0;
 121 }
 122
 123 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 124 krb5_string_to_deltat(const char *string, krb5_deltat *deltat)
 125 {
 126     if((*deltat = parse_time(string, "s")) == -1)
 127         return KRB5_DELTAT_BADFORMAT;
 128     return 0;
 129 }
 130
 131 krb5_deltat
 132 krb5_time_abs(krb5_deltat t1, krb5_deltat t2)
 133 {
 134     krb5_deltat t = t1 - t2;
 135     if (t < 0)
 136         return -t;
 137     return t;
 138 }