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Current File : /opt/imunify360/venv/lib64/python3.11/site-packages/imav/malwarelib/subsys/ainotify.py
"""
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>
"""
from collections import namedtuple
import asyncio
import ctypes
import errno
import logging
import os
import struct
import platform

from defence360agent.subsys import sysctl

Event = namedtuple("Event", ("path", "flags", "cookie", "name", "wd"))


logger = logging.getLogger(__name__)


class Inotify:
    """
    Tiny wrapper for inotify api. See `man inotify` for details
    """

    ACCESS = 0x1  #: File was accessed
    MODIFY = 0x2  #: File was modified
    ATTRIB = 0x4  #: Metadata changed
    CLOSE_WRITE = 0x8  #: Writable file was closed
    CLOSE_NOWRITE = 0x10  #: Unwritable file closed
    OPEN = 0x20  #: File was opened
    MOVED_FROM = 0x40  #: File was moved from X
    MOVED_TO = 0x80  #: File was moved to Y
    CREATE = 0x100  #: Subfile was created
    DELETE = 0x200  #: Subfile was deleted
    DELETE_SELF = 0x400  #: Self was deleted
    MOVE_SELF = 0x800  #: Self was moved

    UNMOUNT = 0x2000  #: Backing fs was unmounted
    Q_OVERFLOW = 0x4000  #: Event queue overflowed
    IGNORED = 0x8000  #: File was ignored

    ONLYDIR = 0x1000000  #: only watch the path if it is a directory
    DONT_FOLLOW = 0x2000000  #: don't follow a sym link
    EXCL_UNLINK = 0x4000000  #: exclude events on unlinked objects
    MASK_ADD = 0x20000000  #: add to the mask of an already existing watch
    ISDIR = 0x40000000  #: event occurred against dir
    ONESHOT = 0x80000000  #: only send event once

    _n = "libc.{}".format("so.6" if platform.system() != "Darwin" else "dylib")
    _libc = ctypes.CDLL(_n, use_errno=True)

    event_prefix = struct.Struct("iIII")

    @staticmethod
    def _call(method, *args):
        """
        Wrapper to all calls to C functions. Raises OSError with appropriate
        errno as argument in case of error return value.
        :param method: method to call
        :param args: method args
        :return: called function return value in case of success
        """
        ret = getattr(Inotify._libc, method)(*args)
        if ret == -1:
            errno = ctypes.get_errno()
            raise OSError(errno, os.strerror(errno))
        return ret

    @staticmethod
    def init():
        """
        Initialize an inotify instance.
        See `man inotify_init` for details
        :return: a file descriptor of new inotify instance
        """
        return Inotify._call("inotify_init")

    @staticmethod
    def add_watch(fd, path, mask):
        """
        Add a watch to an initialized inotify instance. This method is
        idempotent. If called twice with the same :fd: and :path: and
        different mask, will change watch flags of current watch.
        See `man inotify_add_watch` for details
        :param fd: file descriptor returned by `init()`
        :param path: path to file or directory to watch
        :param mask: bitmask of events to monitor
        :return: file descriptor of watch
        """
        return Inotify._call("inotify_add_watch", fd, path, mask)

    @staticmethod
    def rm_watch(fd, wd):
        """
        Remove existing watch from inotify instance.
        :param fd: file descriptor of inotify instance
        :param wd: watch file descriptor, returned by `add_watch()`
        :return: zero
        """
        return Inotify._call("inotify_rm_watch", fd, wd)

    @staticmethod
    def unpack_prefix(data):
        """
        Unpacks prefix of event struct.
        See `man inotify` for details
        :param data: struct bytestring
        :return: tuple of (wd, flag, cookie, length)
        """
        return Inotify.event_prefix.unpack(data)

    @staticmethod
    def unpack_name(data):
        """
        Unpack name field of inotify event struct
        See `man inotify` for details
        :param data: struct bytestring
        :return: name string
        """
        return struct.unpack("%ds" % len(data), data)[0].rstrip(b"\x00")


class Watcher:
    """
    Asynchronous watcher for inotify events
    """

    _CHUNK_SIZE = 1024
    _MAX_WATCH_RETRIES = 3
    _WATCHERS_RAISE_COEFF = 1.5
    _MAX_USER_WATCHES = "fs.inotify.max_user_watches"

    def __init__(self, loop, coro_callback=None):
        self._loop = loop
        self._fd = Inotify.init()
        self._queue = asyncio.Queue()
        self._callback = coro_callback or self._queue.put
        self._loop.add_reader(self._fd, self._read)
        self._reset_state()

    def _reset_state(self):
        self.paths = {}
        self.descriptors = {}
        self.buf = b""

    def _read(self):
        self.buf += os.read(self._fd, self._CHUNK_SIZE)
        # shortcut
        struct_size = Inotify.event_prefix.size
        while len(self.buf) >= struct_size:
            wd, flags, cookie, length = Inotify.unpack_prefix(
                self.buf[:struct_size]
            )
            struct_end = struct_size + length
            name = Inotify.unpack_name(self.buf[struct_size:struct_end])
            self.buf = self.buf[struct_end:]

            if wd not in self.paths:
                continue

            path = self.paths[wd]
            if flags & Inotify.IGNORED:
                logger.warning(
                    "Got IGNORED event for %s, cleaning watch", path
                )
                self._cleanup_watch(path)
                continue
            if flags & Inotify.Q_OVERFLOW:
                logger.error("Inotify queue overflow")
                continue

            ev = Event(path, flags, cookie, name, wd)
            self._loop.create_task(self._callback(ev))

    def _raise_user_watches(self):
        current_max_watches = sysctl.read(self._MAX_USER_WATCHES)
        new_max_watchers = current_max_watches + int(
            current_max_watches * self._WATCHERS_RAISE_COEFF
        )
        logger.info(
            "Raising %s to %s", self._MAX_USER_WATCHES, new_max_watchers
        )
        sysctl.write(self._MAX_USER_WATCHES, new_max_watchers)

    def close(self):
        """
        Close watcher. Close inotify fd, remove reader and reset state
        :return:
        """
        self._loop.remove_reader(self._fd)
        try:
            os.close(self._fd)
        finally:
            self._reset_state()
            self._fd = None

    def watch(self, path, mask):
        """
        Add file to watch
        :param path: file or directory to watch
        :param mask: events mask for this watch
        """
        assert isinstance(path, bytes), "Path must be bytes"
        logger.info("Watching %r", path)
        retries = 0
        while True:
            try:
                wd = Inotify.add_watch(self._fd, path, mask)
                self.paths[wd] = path
                self.descriptors[path] = wd
                break
            except OSError as e:
                if (
                    retries < self._MAX_WATCH_RETRIES
                    and e.errno == errno.ENOSPC
                ):
                    self._raise_user_watches()
                    retries += 1
                    logger.warning(
                        "Inotify: not enough watches (%r), retrying...", path
                    )
                    continue
                logger.error("Inotify failed while watching %r", path)
                raise

    def _cleanup_watch(self, path):
        descriptor = self.descriptors.pop(path, None)
        if descriptor is not None:
            self.paths.pop(descriptor, None)

    def unwatch(self, path):
        """
        Remove file or directory from watch
        :param path: file or directory to remove watch from
        """
        if path not in self.descriptors:
            return
        logger.info("Stop watching %r", path)
        try:
            Inotify.rm_watch(self._fd, self.descriptors[path])
        finally:
            self._cleanup_watch(path)

    async def get_event(self):
        """
        Get watch event
        :return: `Event` named tuple
        """
        event = await self._queue.get()
        logger.debug("Inotify event: %s", event)
        return event

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