#!/usr/bin/env python3
import os
import selectors
import ctypes
from ctypes.util import find_library

IN_CREATE = 0x00000100
IN_DELETE = 0x00000200
IN_MOVED_FROM = 0x00000040
IN_MOVED_TO = 0x00000080
IN_MODIFY = 0x00000002

event_mask_dict = {
    IN_CREATE: "CREATE",
    IN_DELETE: "DELETE",
    IN_MOVED_FROM: "MOVED_FROM",
    IN_MOVED_TO: "MOVED_TO",
    IN_MODIFY: "MODIFY",
}

# if not working lock for "libc.so.6" 
# if don't find it 
# use this command 
# CMD: ldd --verbose $(which python) | grep libc
# if you don't have python try with bash
# if you find libc.so.6
# change c to full path of libc.so.6
# libc = ctypes.CDLL(find_library("/lib/x86_64-linux-gnu/libc.so.6"))

libc = ctypes.CDLL(find_library("c"))

class InotifyEvent(ctypes.Structure):
    _fields_ = [
        ('wd', ctypes.c_int),
        ('mask', ctypes.c_uint32),
        ('cookie', ctypes.c_uint32),
        ('len', ctypes.c_uint32)
    ]

def init_inotify():
    inotify_init = libc.inotify_init1
    inotify_init.argtypes = [ctypes.c_int]
    inotify_init.restype = ctypes.c_int
    return inotify_init(0)

def add_watch(inotify_fd, path, mask):
    inotify_add_watch = libc.inotify_add_watch
    inotify_add_watch.argtypes = [ctypes.c_int, ctypes.c_char_p, ctypes.c_uint32]
    inotify_add_watch.restype = ctypes.c_int
    return inotify_add_watch(inotify_fd, path.encode(), mask)

def watch_directories(paths_to_watch):
    event_mask = IN_CREATE | IN_DELETE | IN_MOVED_FROM | IN_MOVED_TO | IN_MODIFY
    inotify_fd = init_inotify()

    for path in paths_to_watch:
        if os.path.exists(path):
            wd = add_watch(inotify_fd, path, event_mask)

    sel = selectors.DefaultSelector()
    sel.register(inotify_fd, selectors.EVENT_READ)

    print("Watching for file system events in the specified directories\n")

    while True:
        for key, mask in sel.select():
            event_buf = os.read(inotify_fd, ctypes.sizeof(InotifyEvent) + 4096)
            event = InotifyEvent.from_buffer_copy(event_buf)
            try:
                event_name = event_buf[ctypes.sizeof(InotifyEvent):].decode().rstrip('\0')
                if str(os.path.join(paths_to_watch[event.wd - 1], event_name)) != "/dev/tty" :
                    print(f"Path: {os.path.join(paths_to_watch[event.wd - 1], event_name)}, Event mask: {event_mask_dict[event.mask]}")
            except:
                event_name = "NULL"
                try:
                    if str(os.path.join(paths_to_watch[event.wd - 1], event_name)) != "/dev/tty" :
                        print(f"Path: {os.path.join(paths_to_watch[event.wd - 1], event_name)}, Event mask: {event_mask_dict[event.mask]}")
                except:
                    print("NULL !! => check your code !!")

if __name__ == '__main__':
    paths_to_watch = ["/root", "/bin", "/etc", "/lib", "/lib32", "/lib64", "/libx32", "/opt", "/tmp", "/var", "/usr", "/sys","/dev","/boot"]
    watch_directories(paths_to_watch)