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 RCSID("$Id$");
  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
  44 krb5_error_code KRB5_LIB_FUNCTION
  45 krb5_set_real_time (krb5_context context,
  46                     krb5_timestamp sec,
  47                     int32_t usec)
  48 {
  49     struct timeval tv;
  50
  51     gettimeofday(&tv, NULL);
  52
  53     context->kdc_sec_offset = sec - tv.tv_sec;
  54     context->kdc_usec_offset = usec - tv.tv_usec;
  55
  56     if (context->kdc_usec_offset < 0) {
  57         context->kdc_sec_offset--;
  58         context->kdc_usec_offset += 1000000;
  59     }
  60     return 0;
  61 }
  62
  63 /*
  64  * return ``corrected'' time in `timeret'.
  65  */
  66
  67 krb5_error_code KRB5_LIB_FUNCTION
  68 krb5_timeofday (krb5_context context,
  69                 krb5_timestamp *timeret)
  70 {
  71     *timeret = time(NULL) + context->kdc_sec_offset;
  72     return 0;
  73 }
  74
  75 /*
  76  * like gettimeofday but with time correction to the KDC
  77  */
  78
  79 krb5_error_code KRB5_LIB_FUNCTION
  80 krb5_us_timeofday (krb5_context context,
  81                    krb5_timestamp *sec,
  82                    int32_t *usec)
  83 {
  84     struct timeval tv;
  85
  86     gettimeofday (&tv, NULL);
  87
  88     *sec  = tv.tv_sec + context->kdc_sec_offset;
  89     *usec = tv.tv_usec;         /* XXX */
  90     return 0;
  91 }
  92
  93 krb5_error_code KRB5_LIB_FUNCTION
  94 krb5_format_time(krb5_context context, time_t t,
  95                  char *s, size_t len, krb5_boolean include_time)
  96 {
  97     struct tm *tm;
  98     if(context->log_utc)
  99         tm = gmtime (&t);
 100     else
 101         tm = localtime(&t);
 102     if(tm == NULL ||
 103        strftime(s, len, include_time ? context->time_fmt : context->date_fmt, tm) == 0)
 104         snprintf(s, len, "%ld", (long)t);
 105     return 0;
 106 }
 107
 108 krb5_error_code KRB5_LIB_FUNCTION
 109 krb5_string_to_deltat(const char *string, krb5_deltat *deltat)
 110 {
 111     if((*deltat = parse_time(string, "s")) == -1)
 112         return KRB5_DELTAT_BADFORMAT;
 113     return 0;
 114 }