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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2009-2015, 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/types.h> /* for size_t, ssize_t */
#include <sys/time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <time.h>
#ifndef __linux__
# if defined(HAVE_SYSCTL) && defined(KERN_BOOTTIME)
# include <sys/sysctl.h>
# elif defined(HAVE_GETUTXID)
# include <utmpx.h>
# elif defined(HAVE_GETUTID)
# include <utmp.h>
# endif
#endif /* !__linux__ */
#include "sudoers.h"
/*
* Fill in a struct timespec with the time the system booted.
* Returns 1 on success and 0 on failure.
*/
#if defined(__linux__)
bool
get_boottime(struct timespec *ts)
{
char *line = NULL;
size_t linesize = 0;
bool found = false;
long long llval;
ssize_t len;
FILE *fp;
debug_decl(get_boottime, SUDOERS_DEBUG_UTIL);
/* read btime from /proc/stat */
fp = fopen("/proc/stat", "r");
if (fp != NULL) {
while ((len = getdelim(&line, &linesize, '\n', fp)) != -1) {
if (strncmp(line, "btime ", 6) == 0) {
if (line[len - 1] == '\n')
line[len - 1] = '\0';
llval = sudo_strtonum(line + 6, 1, LLONG_MAX, NULL);
if (llval > 0) {
ts->tv_sec = (time_t)llval;
ts->tv_nsec = 0;
found = true;
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"found btime in /proc/stat: %lld", llval);
break;
} else {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"invalid btime in /proc/stat: %s", line);
}
}
}
fclose(fp);
free(line);
}
debug_return_bool(found);
}
#elif defined(HAVE_SYSCTL) && defined(KERN_BOOTTIME)
bool
get_boottime(struct timespec *ts)
{
size_t size;
int mib[2];
struct timeval tv;
debug_decl(get_boottime, SUDOERS_DEBUG_UTIL);
mib[0] = CTL_KERN;
mib[1] = KERN_BOOTTIME;
size = sizeof(tv);
if (sysctl(mib, 2, &tv, &size, NULL, 0) != -1) {
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"KERN_BOOTTIME: %lld, %ld", (long long)tv.tv_sec, (long)tv.tv_usec);
TIMEVAL_TO_TIMESPEC(&tv, ts);
debug_return_bool(true);
}
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"KERN_BOOTTIME: %s", strerror(errno));
debug_return_bool(false);
}
#elif defined(HAVE_GETUTXID)
bool
get_boottime(struct timespec *ts)
{
struct utmpx *ut, key;
debug_decl(get_boottime, SUDOERS_DEBUG_UTIL);
memset(&key, 0, sizeof(key));
key.ut_type = BOOT_TIME;
setutxent();
if ((ut = getutxid(&key)) != NULL) {
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"BOOT_TIME: %lld, %ld", (long long)ut->ut_tv.tv_sec,
(long)ut->ut_tv.tv_usec);
TIMEVAL_TO_TIMESPEC(&ut->ut_tv, ts);
}
endutxent();
debug_return_bool(ut != NULL);
}
#elif defined(HAVE_GETUTID)
bool
get_boottime(struct timespec *ts)
{
struct utmp *ut, key;
debug_decl(get_boottime, SUDOERS_DEBUG_UTIL);
memset(&key, 0, sizeof(key));
key.ut_type = BOOT_TIME;
setutent();
if ((ut = getutid(&key)) != NULL) {
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"BOOT_TIME: %lld", (long long)ut->ut_time);
ts->tv_sec = ut->ut_time;
ts->tv_nsec = 0;
}
endutent();
debug_return_bool(ut != NULL);
}
#else
bool
get_boottime(struct timespec *ts)
{
debug_decl(get_boottime, SUDOERS_DEBUG_UTIL);
debug_return_bool(false);
}
#endif
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