text: #!/usr/bin/env python
  
  # manuf.py: Parser library for Wireshark's OUI database.
  # Copyright (c) 2017 Michael Huang
  #
  # This library is free software. It is dual licensed under the terms of the GNU Lesser General
  # Public License version 3.0 (or any later version) and the Apache License version 2.0.
  #
  # For more information, see:
  #
  # <http://www.gnu.org/licenses/>
  # <http://www.apache.org/licenses/>
  """Parser library for Wireshark's OUI database.
  
  Converts MAC addresses into a manufacturer using Wireshark's OUI database.
  
  See README.md.
  
  """
  from __future__ import print_function
  from collections import namedtuple
  import argparse
  import re
  import sys
  import io
  
  try:
      from urllib2 import urlopen
      from urllib2 import URLError
  except ImportError:
      from urllib.request import urlopen
      from urllib.error import URLError
  
  try:
      from StringIO import StringIO
  except ImportError:
      from io import StringIO
  import importlib
  import os
  
  # Vendor tuple
  Vendor = namedtuple('Vendor', ['manuf', 'manuf_long', 'comment'])
  
  class MacParser(object):
      """Class that contains a parser for Wireshark's OUI database.
  
      Optimized for quick lookup performance by reading the entire file into memory on
      initialization. Maps ranges of MAC addresses to manufacturers and comments (descriptions).
      Contains full support for netmasks and other strange things in the database.
  
      See https://www.wireshark.org/tools/oui-lookup.html
  
      Args:
          manuf_name (str): Location of the manuf database file. Defaults to "manuf" in the same
              directory.
          update (bool): Whether to update the manuf file automatically. Defaults to False.
  
      Raises:
          IOError: If manuf file could not be found.
  
      """
      MANUF_URL = "https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=manuf"
      WFA_URL = "https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=wka"
  
      def  __init__(self, manuf_name=None, update=False):
          self._manuf_name = manuf_name or self.get_packaged_manuf_file_path()
          if update:
              self.update()
          else:
              self.refresh()
  
      def refresh(self, manuf_name=None):
          """Refresh/reload manuf database. Call this when manuf file is updated.
  
          Args:
              manuf_name (str): Location of the manuf data base file. Defaults to "manuf" in the
                  same directory.
  
          Raises:
              IOError: If manuf file could not be found.
  
          """
          if not manuf_name:
              manuf_name = self._manuf_name
          with io.open(manuf_name, "r", encoding="utf-8") as read_file:
              manuf_file = StringIO(read_file.read())
          self._masks = {}
  
          # Build mask -> result dict
          for line in manuf_file:
              try:
                  line = line.strip()
                  if not line or line[0] == "#":
                      continue
                  line = line.replace("\t\t", "\t")
                  fields = [field.strip() for field in line.split("\t")]
  
                  parts = fields[0].split("/")
                  mac_str = self._strip_mac(parts[0])
                  mac_int = self._get_mac_int(mac_str)
                  mask = self._bits_left(mac_str)
  
                  # Specification includes mask
                  if len(parts) > 1:
                      mask_spec = 48 - int(parts[1])
                      if mask_spec > mask:
                          mask = mask_spec
  
                  comment = fields[3].strip("#").strip() if len(fields) > 3 else None
                  long_name = fields[2] if len(fields) > 2 else None
  
                  self._masks[(mask, mac_int >> mask)] = Vendor(manuf=fields[1], manuf_long=long_name, comment=comment)
              except:
                  print( "Couldn't parse line", line)
                  raise
  
  
          manuf_file.close()
  
      def update(self, manuf_url=None, wfa_url=None, manuf_name=None, refresh=True):
          """Update the Wireshark OUI database to the latest version.
  
          Args:
              manuf_url (str): URL pointing to OUI database. Defaults to database located at
                  code.wireshark.org.
              manuf_name (str): Location to store the new OUI database. Defaults to "manuf" in the
                  same directory.
              refresh (bool): Refresh the database once updated. Defaults to True. Uses database
                  stored at manuf_name.
  
          Raises:
              URLError: If the download fails
  
          """
          if not manuf_url:
              manuf_url = self.MANUF_URL
          if not manuf_name:
              manuf_name = self._manuf_name
  
          # Retrieve the new database
          try:
              response = urlopen(manuf_url)
          except URLError:
              raise URLError("Failed downloading OUI database")
  
          # Parse the response
          if response.code == 200:
              with open(manuf_name, "wb") as write_file:
                  write_file.write(response.read())
              if refresh:
                  self.refresh(manuf_name)
          else:
              err = "{0} {1}".format(response.code, response.msg)
              raise URLError("Failed downloading database: {0}".format(err))
  
          response.close()
          if not wfa_url:
              wfa_url = self.WFA_URL
  
          # Append WFA to new database
          try:
              response = urlopen(wfa_url)
          except URLError:
              raise URLError("Failed downloading WFA database")
  
          # Parse the response
          if response.code == 200:
              with open(manuf_name, "ab") as write_file:
                  write_file.write(response.read())
              if refresh:
                  self.refresh(manuf_name)
          else:
              err = "{0} {1}".format(response.code, response.msg)
              raise URLError("Failed downloading database: {0}".format(err))
  
          response.close()
  
      def search(self, mac, maximum=1):
          """Search for multiple Vendor tuples possibly matching a MAC address.
  
          Args:
              mac (str): MAC address in standard format.
              maximum (int): Maximum results to return. Defaults to 1.
  
          Returns:
              List of Vendor namedtuples containing (manuf, comment), with closest result first. May
              be empty if no results found.
  
          Raises:
              ValueError: If the MAC could not be parsed.
  
          """
          vendors = []
          if maximum <= 0 or not mac:
              return vendors
          mac_str = self._strip_mac(mac)
          mac_int = self._get_mac_int(mac_str)
  
          # If the user only gave us X bits, check X bits. No partial matching!
          for mask in range(self._bits_left(mac_str), 48):
              result = self._masks.get((mask, mac_int >> mask))
              if result:
                  vendors.append(result)
                  if len(vendors) >= maximum:
                      break
          return vendors
  
      def get_all(self, mac):
          """Get a Vendor tuple containing (manuf, comment) from a MAC address.
  
          Args:
              mac (str): MAC address in standard format.
  
          Returns:
              Vendor: Vendor namedtuple containing (manuf, comment). Either or both may be None if
              not found.
  
          Raises:
              ValueError: If the MAC could not be parsed.
  
          """
          vendors = self.search(mac)
          if len(vendors) == 0:
              return Vendor(manuf=None, manuf_long=None, comment=None)
          return vendors[0]
  
      def get_manuf(self, mac):
          """Returns manufacturer from a MAC address.
  
          Args:
              mac (str): MAC address in standard format.
  
          Returns:
              string: String containing manufacturer, or None if not found.
  
          Raises:
              ValueError: If the MAC could not be parsed.
  
          """
          return self.get_all(mac).manuf
  
      def get_manuf_long(self, mac):
          """Returns manufacturer long name from a MAC address.
  
          Args:
              mac (str): MAC address in standard format.
  
          Returns:
              string: String containing manufacturer, or None if not found.
  
          Raises:
              ValueError: If the MAC could not be parsed.
  
          """
          return self.get_all(mac).manuf_long
  
      def get_comment(self, mac):
          """Returns comment from a MAC address.
  
          Args:
              mac (str): MAC address in standard format.
  
          Returns:
              string: String containing comment, or None if not found.
  
          Raises:
              ValueError: If the MAC could not be parsed.
  
          """
          return self.get_all(mac).comment
  
      # Gets the integer representation of a stripped mac string
      def _get_mac_int(self, mac_str):
          try:
              # Fill in missing bits with zeroes
              return int(mac_str, 16) << self._bits_left(mac_str)
          except ValueError:
              raise ValueError("Could not parse MAC: {0}".format(mac_str))
  
      # Regular expression that matches '-', ':', and '.' characters
      _pattern = re.compile(r"[-:\.]")
  
      # Strips the MAC address of '-', ':', and '.' characters
      def _strip_mac(self, mac):
          return self._pattern.sub("", mac)
  
      # Gets the number of bits left in a mac string
      @staticmethod
      def _bits_left(mac_str):
          return 48 - 4 * len(mac_str)
  
      @staticmethod
      def get_packaged_manuf_file_path():
          """
          returns the path to manuf file bundled with the package.
          :return:
          """
          if __package__ is None or __package__ == "":
              package_init_path = __file__
          else:
              package_init_path = importlib.import_module(__package__).__file__
          package_path = os.path.abspath(os.path.join(package_init_path, os.pardir))
          manuf_file_path = os.path.join(package_path, 'manuf')
          return manuf_file_path
  
  
  def main(*input_args):
      """Simple command line wrapping for MacParser."""
      argparser = argparse.ArgumentParser(description="Parser utility for Wireshark's OUI database.")
      argparser.add_argument('-m', "--manuf",
                             help="manuf file path. Defaults to manuf file packaged with manuf.py installation",
                             action="store",
                             default=None)
  
      argparser.add_argument("-u", "--update",
                             help="update manuf file from the internet",
                             action="store_true")
      argparser.add_argument("mac_address", nargs='?', help="MAC address to check")
  
      input_args = input_args or None  # if main is called with explicit args parse these - else use sysargs
      args = argparser.parse_args(args=input_args)
      parser = MacParser(manuf_name=args.manuf, update=args.update)
  
      if args.mac_address:
          print(parser.get_all(args.mac_address))
  
      sys.exit(0)
  
  if __name__ == "__main__":
      main()
  