code: def run_setkey(input):
      
      SETKEY_BINARY = '/usr/sbin/setkey'
      fd, filename = tempfile.mkstemp('w')
      f = os.fdopen(fd, 'w')
      f.write(input)
      f.close()
      output = subprocess.check_output(['sudo', SETKEY_BINARY, '-f', filename])
      os.remove(filename)
      return output.decode('utf-8')
docs: Runs a script through the 'setkey' command that is a user space insterface for PFKEY.
      :param input: setkey configuration file contents.