/*
* BSD LICENSE
*
* Copyright(c) 2019-2020 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.O
*
*/
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "common.h"
FILE *
pqos_fopen(const char *name, const char *mode)
{
int fd;
FILE *stream = NULL;
struct stat lstat_val;
struct stat fstat_val;
stream = fopen(name, mode);
if (stream == NULL)
return stream;
fd = fileno(stream);
if (fd == -1)
goto pqos_fopen_error;
/* collect any link info about the file */
if (lstat(name, &lstat_val) == -1)
goto pqos_fopen_error;
/* collect info about the opened file */
if (fstat(fd, &fstat_val) == -1)
goto pqos_fopen_error;
/* we should not have followed a symbolic link */
if (lstat_val.st_mode != fstat_val.st_mode ||
lstat_val.st_ino != fstat_val.st_ino ||
lstat_val.st_dev != fstat_val.st_dev) {
printf("File %s is a symlink\n", name);
goto pqos_fopen_error;
}
return stream;
pqos_fopen_error:
if (stream != NULL)
fclose(stream);
return NULL;
}
int
pqos_open(const char *pathname, int flags, mode_t mode)
{
int fd;
struct stat lstat_val;
struct stat fstat_val;
/* open the file */
fd = open(pathname, flags, mode);
if (fd == -1)
return fd;
/* collect any link info about the file */
if (lstat(pathname, &lstat_val) == -1)
goto pqos_open_error;
/* collect info about the opened file */
if (fstat(fd, &fstat_val) == -1)
goto pqos_open_error;
/* we should not have followed a symbolic link */
if (lstat_val.st_mode != fstat_val.st_mode ||
lstat_val.st_ino != fstat_val.st_ino ||
lstat_val.st_dev != fstat_val.st_dev) {
printf("File %s is a symlink\n", pathname);
goto pqos_open_error;
}
return fd;
pqos_open_error:
if (fd != -1)
close(fd);
return -1;
}