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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1999-2005, 2007, 2009-2015
* 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.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*
* 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 <stdlib.h>
#include <string.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "sudo_compat.h"
#include "sudo_util.h"
#include "sudo_debug.h"
bool
sudo_lock_file_v1(int fd, int type)
{
return sudo_lock_region_v1(fd, type, 0);
}
/*
* Lock/unlock all or part of a file.
*/
#ifdef HAVE_LOCKF
bool
sudo_lock_region_v1(int fd, int type, off_t len)
{
int op, rc;
off_t oldpos = -1;
debug_decl(sudo_lock_region, SUDO_DEBUG_UTIL);
switch (type) {
case SUDO_LOCK:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: lock %d:%lld",
__func__, fd, (long long)len);
op = F_LOCK;
break;
case SUDO_TLOCK:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: tlock %d:%lld",
__func__, fd, (long long)len);
op = F_TLOCK;
break;
case SUDO_UNLOCK:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: unlock %d:%lld",
__func__, fd, (long long)len);
op = F_ULOCK;
/* Must seek to start of file to unlock the entire thing. */
if (len == 0 && (oldpos = lseek(fd, 0, SEEK_CUR)) != -1) {
if (lseek(fd, 0, SEEK_SET) == -1) {
sudo_debug_printf(
SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to seek to beginning");
}
}
break;
default:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: bad lock type %d",
__func__, type);
errno = EINVAL;
debug_return_bool(false);
}
rc = lockf(fd, op, len);
if (oldpos != -1) {
if (lseek(fd, oldpos, SEEK_SET) == -1) {
sudo_debug_printf(
SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to restore offset");
}
}
debug_return_bool(rc == 0);
}
#else
bool
sudo_lock_region_v1(int fd, int type, off_t len)
{
struct flock lock;
int func;
debug_decl(sudo_lock_file, SUDO_DEBUG_UTIL);
switch (type) {
case SUDO_LOCK:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: lock %d:%lld",
__func__, fd, (long long)len);
lock.l_type = F_WRLCK;
func = F_SETLKW;
break;
case SUDO_TLOCK:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: tlock %d:%lld",
__func__, fd, (long long)len);
lock.l_type = F_WRLCK;
func = F_SETLK;
break;
case SUDO_UNLOCK:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: unlock %d:%lld",
__func__, fd, (long long)len);
lock.l_type = F_UNLCK;
func = F_SETLK;
break;
default:
sudo_debug_printf(SUDO_DEBUG_INFO, "%s: bad lock type %d",
__func__, type);
errno = EINVAL;
debug_return_bool(false);
}
lock.l_start = 0;
lock.l_len = len;
lock.l_pid = 0;
lock.l_whence = len ? SEEK_CUR : SEEK_SET;
debug_return_bool(fcntl(fd, func, &lock) == 0);
}
#endif
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