1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/krb5/os/ustime.c */
3 /*
4 * Copyright 1990,1991,2007 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 */
26
27 /*
28 * krb5_crypto_us_timeofday() does all of the real work; however, we
29 * handle the time offset adjustment here, since this is context
30 * specific, and the crypto version of this call doesn't have access
31 * to the context variable. Fortunately the only user of
32 * krb5_crypto_us_timeofday in the crypto library doesn't require that
33 * this time adjustment be done.
34 */
35
36 #include "k5-int.h"
37 #include "os-proto.h"
38
39 krb5_error_code
k5_time_with_offset(krb5_timestamp offset,krb5_int32 offset_usec,krb5_timestamp * time_out,krb5_int32 * usec_out)40 k5_time_with_offset(krb5_timestamp offset, krb5_int32 offset_usec,
41 krb5_timestamp *time_out, krb5_int32 *usec_out)
42 {
43 krb5_timestamp sec;
44 krb5_int32 usec;
45 krb5_error_code retval;
46
47 retval = krb5_crypto_us_timeofday(&sec, &usec);
48 if (retval)
49 return retval;
50 usec += offset_usec;
51 if (usec > 1000000) {
52 usec -= 1000000;
53 sec = ts_incr(sec, 1);
54 }
55 if (usec < 0) {
56 usec += 1000000;
57 sec = ts_incr(sec, -1);
58 }
59 sec = ts_incr(sec, offset);
60
61 *time_out = sec;
62 *usec_out = usec;
63 return 0;
64 }
65
66 krb5_error_code KRB5_CALLCONV
krb5_us_timeofday(krb5_context context,krb5_timestamp * seconds,krb5_int32 * microseconds)67 krb5_us_timeofday(krb5_context context, krb5_timestamp *seconds,
68 krb5_int32 *microseconds)
69 {
70 krb5_os_context os_ctx = &context->os_context;
71
72 if (os_ctx->os_flags & KRB5_OS_TOFFSET_TIME) {
73 *seconds = os_ctx->time_offset;
74 *microseconds = os_ctx->usec_offset;
75 return 0;
76 } else if (os_ctx->os_flags & KRB5_OS_TOFFSET_VALID) {
77 return k5_time_with_offset(os_ctx->time_offset, os_ctx->usec_offset,
78 seconds, microseconds);
79 } else {
80 return krb5_crypto_us_timeofday(seconds, microseconds);
81 }
82 }
83