Parche para al archivo "nppdf.so"

delete_nppdf32Log.py

#!/usr/bin/env python3
#-*- coding: utf-8 -*-
#
# Copyright (C) 2013 Cristian Hernán Schmidt <[email protected]>
#
# delete_nppdf32Log.py 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.
#
# delete_nppdf32Log.py 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 delete_nppdf32Log.py. If not, see <http://www.gnu.org/licenses/>.

r"""
    Parche para al archivo "nppdf.so" del paquete "mozilla-acroread" (Debian)
    para que no genere en el home el archivo 'C:\nppdf32Log\debuglog.txt',
    la información de este archivo es redireccionada a /dev/null

    Inspiración:
    https://bugs.launchpad.net/ubuntu/+source/acroread/+bug/986841/comments/21
"""
import os
import sys
import mmap

from subprocess import PIPE, Popen

if os.geteuid() != 0:
    raise RuntimeError('Se necesitan privilegios de root')

flog = r"C:\nppdf32Log\debuglog.txt"
find = r"find {} -name '{}' -type f -print0"
find_l = find.format('/lib /usr/lib /usr/local/lib', 'nppdf.so')
find_f = find.format('/home -maxdepth 4', flog.replace('\\', '\\\\'))
backup = "/root/backup.nppdf.so"

target = flog.encode()
replacement = b"/dev/null"
nfill = len(target) - len(replacement)
if nfill >= 0:
    replacement += b'\0' * nfill
else:
    raise RuntimeError('len(replacement) <= len(target) (¡modificó el script!)')

if not os.path.isdir(backup):
    os.makedirs(backup)

print('Comenzando busqueda...')
libs, err = Popen(find_l, stdout=PIPE, stderr=PIPE, shell=True).communicate()
if err:
    raise OSError(err)
elif libs:
    for lib in libs.decode().split('\0'):
        if os.path.isfile(lib):
            sys.stdout.write('  {}'.format(lib))
            sys.stdout.flush()
            with open(lib, 'r+') as f:
                code = mmap.mmap(f.fileno(), 0)
                offset = code.find(target)
                if offset != -1:
                    _lib = os.path.join(backup, lib.replace('/', '|'))
                    os.system('cp "{}" "{}"'.format(lib, _lib))
                    code[offset:offset+len(target)] = replacement
                    sys.stdout.write('  INSULTO ARREGLADO\n')
                    sys.stdout.write('    BACKUP: {} -> {}\n'.format(lib, _lib))
                elif code.find(replacement) != -1:
                    sys.stdout.write('  YA FUE ARREGLADO\n')
                else:
                    sys.stdout.write('  NADA QUE HACER\n')
                sys.stdout.flush()
else:
    print("No se encontró la libreria 'nppdf.so' en su sistema")

print('Comenzando limpieza...')
files, err = Popen(find_f, stdout=PIPE, stderr=PIPE, shell=True).communicate()
if err:
    raise OSError(err)
elif files:
    for file in files.decode().split('\0'):
        if os.path.isfile(file):
            os.remove(file)
            print('  {}  ELIMINADO'.format(file))

print("Parche aplicado y /home limpio.")