1 /*
2 * Copyright (c) 2021 Yubico AB. All rights reserved.
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8 #include <errno.h>
9 #include "fido.h"
10
11 static int
timespec_to_ms(const struct timespec * ts)12 timespec_to_ms(const struct timespec *ts)
13 {
14 int64_t x, y;
15
16 if (ts->tv_sec < 0 || ts->tv_nsec < 0 ||
17 ts->tv_nsec >= 1000000000LL)
18 return -1;
19
20 if ((uint64_t)ts->tv_sec >= INT64_MAX / 1000LL)
21 return -1;
22
23 x = ts->tv_sec * 1000LL;
24 y = ts->tv_nsec / 1000000LL;
25
26 if (INT64_MAX - x < y || x + y > INT_MAX)
27 return -1;
28
29 return (int)(x + y);
30 }
31
32 int
fido_time_now(struct timespec * ts_now)33 fido_time_now(struct timespec *ts_now)
34 {
35 if (clock_gettime(CLOCK_MONOTONIC, ts_now) != 0) {
36 fido_log_error(errno, "%s: clock_gettime", __func__);
37 return -1;
38 }
39
40 return 0;
41 }
42
43 int
fido_time_delta(const struct timespec * ts_start,int * ms_remain)44 fido_time_delta(const struct timespec *ts_start, int *ms_remain)
45 {
46 struct timespec ts_end, ts_delta;
47 int ms;
48
49 if (*ms_remain < 0)
50 return 0;
51
52 if (clock_gettime(CLOCK_MONOTONIC, &ts_end) != 0) {
53 fido_log_error(errno, "%s: clock_gettime", __func__);
54 return -1;
55 }
56
57 if (timespeccmp(&ts_end, ts_start, <)) {
58 fido_log_debug("%s: timespeccmp", __func__);
59 return -1;
60 }
61
62 timespecsub(&ts_end, ts_start, &ts_delta);
63
64 if ((ms = timespec_to_ms(&ts_delta)) < 0) {
65 fido_log_debug("%s: timespec_to_ms", __func__);
66 return -1;
67 }
68
69 if (ms > *ms_remain)
70 ms = *ms_remain;
71
72 *ms_remain -= ms;
73
74 return 0;
75 }
76