code: def _check_connection(self, local_end, remote_end, process):
      
      # check tcp end points
      cur_host1, cur_port1 = self._get_tuple(local_end.split(':'))
      cur_host2, cur_port2 = self._get_tuple(remote_end.split(':'))
  
      # check whether the connection is interested or not by checking user input
      host_port_is_interested = False
      for (host1, port1, host2, port2) in self.input_connections:
        if self._match_host_port(host1, port1, cur_host1, cur_port1) and self._match_host_port(host2, port2, cur_host2, cur_port2):
          host_port_is_interested = True
          break
        if self._match_host_port(host1, port1, cur_host2, cur_port2) and self._match_host_port(host2, port2, cur_host1, cur_port1):
          host_port_is_interested = True
          break
  
      # check whether the connection is interested or not by checking process names given in the config
      process_is_interested = False
      for pid, name in self.input_processes:
        if self._match_processes(pid, name, process):
          process_is_interested = True
          break
  
      return cur_host1 + '_' + cur_port1, cur_host2 + '_' + cur_port2, host_port_is_interested and process_is_interested
docs: Check whether the connection is of interest or not
      :param local_end: Local connection end point, e.g., 'host1:port1'
      :param remote_end: Remote connection end point, e.g., 'host2:port2'
      :param process: Current connection 's process info, e.g., '1234/firefox'
      :return: a tuple of (local_end, remote_end, True/False); e.g. ('host1_23232', 'host2_2222', True)