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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2009-2021 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 <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include <compat/stdbool.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include <sudo_compat.h>
#include <sudo_debug.h>
#include <sudo_iolog.h>
#include <sudo_util.h>
static unsigned char const gzip_magic[2] = {0x1f, 0x8b};
/*
* Open the specified I/O log file and store in iol.
* Stores the open file handle which has the close-on-exec flag set.
*/
bool
iolog_open(struct iolog_file *iol, int dfd, int iofd, const char *mode)
{
int flags;
const char *file;
unsigned char magic[2];
const uid_t iolog_uid = iolog_get_uid();
const gid_t iolog_gid = iolog_get_gid();
debug_decl(iolog_open, SUDO_DEBUG_UTIL);
if (mode[0] == 'r') {
flags = mode[1] == '+' ? O_RDWR : O_RDONLY;
} else if (mode[0] == 'w') {
flags = O_CREAT|O_TRUNC;
flags |= mode[1] == '+' ? O_RDWR : O_WRONLY;
} else {
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: invalid I/O mode %s", __func__, mode);
debug_return_bool(false);
}
if ((file = iolog_fd_to_name(iofd)) == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: invalid iofd %d", __func__, iofd);
debug_return_bool(false);
}
iol->writable = false;
iol->compressed = false;
if (iol->enabled) {
int fd = iolog_openat(dfd, file, flags);
if (fd != -1) {
if (*mode == 'w') {
if (fchown(fd, iolog_uid, iolog_gid) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to fchown %d:%d %s", __func__,
(int)iolog_uid, (int)iolog_gid, file);
}
iol->compressed = iolog_get_compress();
} else {
/* check for gzip magic number */
if (pread(fd, magic, sizeof(magic), 0) == ssizeof(magic)) {
if (magic[0] == gzip_magic[0] && magic[1] == gzip_magic[1])
iol->compressed = true;
}
}
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != -1) {
#ifdef HAVE_ZLIB_H
if (iol->compressed)
iol->fd.g = gzdopen(fd, mode);
else
#endif
iol->fd.f = fdopen(fd, mode);
}
if (iol->fd.v != NULL) {
switch ((flags & O_ACCMODE)) {
case O_WRONLY:
case O_RDWR:
iol->writable = true;
break;
}
} else {
int save_errno = errno;
close(fd);
errno = save_errno;
fd = -1;
}
}
if (fd == -1) {
iol->enabled = false;
debug_return_bool(false);
}
} else {
if (*mode == 'w') {
/* Remove old log file in case we recycled sequence numbers. */
(void)unlinkat(dfd, file, 0);
}
}
debug_return_bool(true);
}
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