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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)