/*

 * 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;

}