1 /*
2 * lib/krb5/os/toffset.c
3 *
4 * Copyright 1995 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 * These routines manipulates the time offset fields in the os context.
27 */
28
29 #include "k5-int.h"
30
31 /*
32 * This routine takes the "real time" as input, and sets the time
33 * offset field in the context structure so that the krb5 time
34 * routines will return the correct time as corrected by difference
35 * between the system time and the "real time" as passed to this
36 * routine
37 */
38 krb5_error_code KRB5_CALLCONV
krb5_set_real_time(krb5_context context,krb5_timestamp seconds,krb5_int32 microseconds)39 krb5_set_real_time(krb5_context context, krb5_timestamp seconds, krb5_int32 microseconds)
40 {
41 krb5_os_context os_ctx = context->os_context;
42 krb5_int32 sec, usec;
43 krb5_error_code retval;
44
45 retval = krb5_crypto_us_timeofday(&sec, &usec);
46 if (retval)
47 return retval;
48 os_ctx->time_offset = seconds - sec;
49 os_ctx->usec_offset = microseconds - usec;
50 os_ctx->os_flags = ((os_ctx->os_flags & ~KRB5_OS_TOFFSET_TIME) |
51 KRB5_OS_TOFFSET_VALID);
52 return 0;
53 }
54
55 /*
56 * This routine sets the krb5 time routines so that they will return
57 * the seconds and microseconds value as input to this function. This
58 * is useful for running the krb5 routines through test suites
59 */
60 krb5_error_code
krb5_set_debugging_time(krb5_context context,krb5_timestamp seconds,krb5_int32 microseconds)61 krb5_set_debugging_time(krb5_context context, krb5_timestamp seconds, krb5_int32 microseconds)
62 {
63 krb5_os_context os_ctx = context->os_context;
64
65 os_ctx->time_offset = seconds;
66 os_ctx->usec_offset = microseconds;
67 os_ctx->os_flags = ((os_ctx->os_flags & ~KRB5_OS_TOFFSET_VALID) |
68 KRB5_OS_TOFFSET_TIME);
69 return 0;
70 }
71
72 /*
73 * This routine turns off the time correction fields, so that the krb5
74 * routines return the "natural" time.
75 */
76 krb5_error_code
krb5_use_natural_time(krb5_context context)77 krb5_use_natural_time(krb5_context context)
78 {
79 krb5_os_context os_ctx = context->os_context;
80
81 os_ctx->os_flags &= ~(KRB5_OS_TOFFSET_VALID|KRB5_OS_TOFFSET_TIME);
82
83 return 0;
84 }
85
86 /*
87 * This routine returns the current time offsets in use.
88 */
89 krb5_error_code KRB5_CALLCONV
krb5_get_time_offsets(krb5_context context,krb5_timestamp * seconds,krb5_int32 * microseconds)90 krb5_get_time_offsets(krb5_context context, krb5_timestamp *seconds, krb5_int32 *microseconds)
91 {
92 krb5_os_context os_ctx = context->os_context;
93
94 if (seconds)
95 *seconds = os_ctx->time_offset;
96 if (microseconds)
97 *microseconds = os_ctx->usec_offset;
98 return 0;
99 }
100
101
102 /*
103 * This routine sets the time offsets directly.
104 */
105 krb5_error_code
krb5_set_time_offsets(krb5_context context,krb5_timestamp seconds,krb5_int32 microseconds)106 krb5_set_time_offsets(krb5_context context, krb5_timestamp seconds, krb5_int32 microseconds)
107 {
108 krb5_os_context os_ctx = context->os_context;
109
110 os_ctx->time_offset = seconds;
111 os_ctx->usec_offset = microseconds;
112 os_ctx->os_flags = ((os_ctx->os_flags & ~KRB5_OS_TOFFSET_TIME) |
113 KRB5_OS_TOFFSET_VALID);
114 return 0;
115 }
116