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"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Copyright © 2019 Cloud Linux Software Inc.
This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
chattr.py
This is a module for managing file attributes via ioctl.
Used IOCTL request constants:
FS_IOC_GETFLAGS - get fs flags
FS_IOC_SETFLAGS - set fs flags
Supported attributes:
FS_IMMUTABLE_FL - immutable attribute
Refer to include/linux/fs.h for values of above constants:
https://elixir.bootlin.com/linux/v2.6.32.71/source/include/linux/fs.h
"""
import sys
from array import array
from fcntl import ioctl
# IOCTL requests
FS_IOC_SETFLAGS = 0x40086602
FS_IOC_GETFLAGS = 0x80086601
# File attribute flags
FS_IMMUTABLE_FL = 0x00000010
def get_flags(fd):
"""Get attributes of a file.
:param fd: descriptor of a file to examine, read-only access is enough
:return: flags as integer value
"""
flags_ptr = array("i", [0])
ioctl(fd, FS_IOC_GETFLAGS, flags_ptr, 1)
return int.from_bytes(flags_ptr, byteorder=sys.byteorder)
def _set_flags(fd, flags):
"""Replace existing file attributes with the ones provided.
Calling _set_flags() directly is most likely NOT what you want. Consider
using append_flags() and subtract_flags().
:param fd: descriptor of a file to modify, read-only access is enough
:param flags: attribute flags combined by bitwise OR operator |
"""
flags_ptr = array("i", [flags])
ioctl(fd, FS_IOC_SETFLAGS, flags_ptr)
def append_flags(fd, flags):
"""Enable given attributes of a file. See _set_flags() for details."""
new_flags = get_flags(fd) | flags
_set_flags(fd, new_flags)
def subtract_flags(fd, flags):
"""Disable given attributes of a file. See _set_flags() for details."""
new_flags = get_flags(fd) & ~flags
_set_flags(fd, new_flags)
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