/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2014-2018 Todd C. Miller <Todd.Miller@sudo.ws>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

/*

 * This is an open source non-commercial project. Dear PVS-Studio, please check it.

 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com

 */

#include <config.h>

#include <sys/time.h>

#include <time.h>

#if defined(__MACH__) && !defined(HAVE_CLOCK_GETTIME)

# include <mach/mach.h>

# include <mach/mach_time.h>

# include <mach/clock.h>

#endif

#include "sudo_compat.h"

#include "sudo_debug.h"

#include "sudo_util.h"

/*

 * On Linux and FreeBSD, CLOCK_MONOTONIC does not run while sleeping.

 * Linux provides CLOCK_BOOTTIME which runs while sleeping (FreeBSD does not).

 * Some systems provide CLOCK_UPTIME which only runs while awake.

 */

#if defined(CLOCK_BOOTTIME)

# define SUDO_CLOCK_BOOTTIME  CLOCK_BOOTTIME

#elif defined(CLOCK_MONOTONIC_RAW)

# define SUDO_CLOCK_BOOTTIME  CLOCK_MONOTONIC_RAW

#elif defined(CLOCK_MONOTONIC)

# define SUDO_CLOCK_BOOTTIME  CLOCK_MONOTONIC

#endif

#if defined(CLOCK_UPTIME_RAW)

# define SUDO_CLOCK_UPTIME  CLOCK_UPTIME_RAW

#elif defined(CLOCK_UPTIME)

# define SUDO_CLOCK_UPTIME  CLOCK_UPTIME

#elif defined(CLOCK_MONOTONIC)

# define SUDO_CLOCK_UPTIME  CLOCK_MONOTONIC

#endif

/*

 * Wall clock time, may run backward.

 */

#if defined(HAVE_CLOCK_GETTIME)

int

sudo_gettime_real_v1(struct timespec *ts)

{

    debug_decl(sudo_gettime_real, SUDO_DEBUG_UTIL);

    if (clock_gettime(CLOCK_REALTIME, ts) == -1) {

  struct timeval tv;

  sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,

      "clock_gettime(CLOCK_REALTIME) failed, trying gettimeofday()");

  if (gettimeofday(&tv, NULL) == -1)

      debug_return_int(-1);

  TIMEVAL_TO_TIMESPEC(&tv, ts);

    }

    debug_return_int(0);

}

#else

int

sudo_gettime_real_v1(struct timespec *ts)

{

    struct timeval tv;

    debug_decl(sudo_gettime_real, SUDO_DEBUG_UTIL);

    if (gettimeofday(&tv, NULL) == -1)

  debug_return_int(-1);

    TIMEVAL_TO_TIMESPEC(&tv, ts);

    debug_return_int(0);

}

#endif

/*

 * Monotonic time, only runs forward.

 * We use a timer that only increments while sleeping, if possible.

 */

#if defined(HAVE_CLOCK_GETTIME) && defined(SUDO_CLOCK_BOOTTIME)

int

sudo_gettime_mono_v1(struct timespec *ts)

{

    static int has_monoclock = -1;

    debug_decl(sudo_gettime_mono, SUDO_DEBUG_UTIL);

    /* Check whether the kernel/libc actually supports a monotonic clock. */

# ifdef _SC_MONOTONIC_CLOCK

    if (has_monoclock == -1)

  has_monoclock = sysconf(_SC_MONOTONIC_CLOCK) != -1;

# endif

    if (!has_monoclock)

  debug_return_int(sudo_gettime_real(ts));

    if (clock_gettime(SUDO_CLOCK_BOOTTIME, ts) == -1) {

  sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,

      "clock_gettime(%d) failed, using wall clock",

      (int)SUDO_CLOCK_BOOTTIME);

  has_monoclock = 0;

  debug_return_int(sudo_gettime_real(ts));

    }

    debug_return_int(0);

}

#elif defined(HAVE_GETHRTIME)

int

sudo_gettime_mono_v1(struct timespec *ts)

{

    hrtime_t nsec;

    debug_decl(sudo_gettime_mono, SUDO_DEBUG_UTIL);

    nsec = gethrtime();

    ts->tv_sec = nsec / 1000000000;

    ts->tv_nsec = nsec % 1000000000;

    debug_return_int(0);

}

#elif defined(__MACH__)

int

sudo_gettime_mono_v1(struct timespec *ts)

{

    uint64_t abstime, nsec;

    static mach_timebase_info_data_t timebase_info;

    debug_decl(sudo_gettime_mono, SUDO_DEBUG_UTIL);

    if (timebase_info.denom == 0)

  (void) mach_timebase_info(&timebase_info);

#ifdef HAVE_MACH_CONTINUOUS_TIME

    abstime = mach_continuous_time();   /* runs while asleep */

#else

    abstime = mach_absolute_time();   /* doesn't run while asleep */

#endif

    nsec = abstime * timebase_info.numer / timebase_info.denom;

    ts->tv_sec = nsec / 1000000000;

    ts->tv_nsec = nsec % 1000000000;

    debug_return_int(0);

}

#else

int

sudo_gettime_mono_v1(struct timespec *ts)

{

    /* No monotonic clock available, use wall clock. */

    return sudo_gettime_real(ts);

}

#endif

/*

 * Monotonic time, only runs forward.

 * We use a timer that only increments while awake, if possible.

 */

#if defined(HAVE_CLOCK_GETTIME) && defined(SUDO_CLOCK_UPTIME)

int

sudo_gettime_awake_v1(struct timespec *ts)

{

    static int has_monoclock = -1;

    debug_decl(sudo_gettime_awake, SUDO_DEBUG_UTIL);

    /* Check whether the kernel/libc actually supports a monotonic clock. */

# ifdef _SC_MONOTONIC_CLOCK

    if (has_monoclock == -1)

  has_monoclock = sysconf(_SC_MONOTONIC_CLOCK) != -1;

# endif

    if (!has_monoclock)

  debug_return_int(sudo_gettime_real(ts));

    if (clock_gettime(SUDO_CLOCK_UPTIME, ts) == -1) {

  sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,

      "clock_gettime(%d) failed, using wall clock",

      (int)SUDO_CLOCK_UPTIME);

  has_monoclock = 0;

  debug_return_int(sudo_gettime_real(ts));

    }

    debug_return_int(0);

}

#elif defined(HAVE_GETHRTIME)

int

sudo_gettime_awake_v1(struct timespec *ts)

{

    hrtime_t nsec;

    debug_decl(sudo_gettime_awake, SUDO_DEBUG_UTIL);

    /* Currently the same as sudo_gettime_mono() */

    nsec = gethrtime();

    ts->tv_sec = nsec / 1000000000;

    ts->tv_nsec = nsec % 1000000000;

    debug_return_int(0);

}

#elif defined(__MACH__)

int

sudo_gettime_awake_v1(struct timespec *ts)

{

    uint64_t abstime, nsec;

    static mach_timebase_info_data_t timebase_info;

    debug_decl(sudo_gettime_awake, SUDO_DEBUG_UTIL);

    if (timebase_info.denom == 0)

  (void) mach_timebase_info(&timebase_info);

    abstime = mach_absolute_time();

    nsec = abstime * timebase_info.numer / timebase_info.denom;

    ts->tv_sec = nsec / 1000000000;

    ts->tv_nsec = nsec % 1000000000;

    debug_return_int(0);

}

#else

int

sudo_gettime_awake_v1(struct timespec *ts)

{

    /* No monotonic uptime clock available, use wall clock. */

    return sudo_gettime_real(ts);

}

#endif