sniffer.py 文件源码

def _decode(self):
        try:
            ip = IPHeader(self.ip_frame)
            self.layer[socket.IPPROTO_IP] = ip

            payload_start = ip.header_length * 4

            if ip.protocol == socket.IPPROTO_TCP:
                tcp = TCPHeader(self.ip_frame, ip.header_length * 4)
                self.layer[socket.IPPROTO_TCP] = tcp
                payload_start += tcp.data_offset * 4
            else:
                print("Unsupported IP protocol: %s" % ip.protocol)

        except Exception as e:
            raise ValueError("Failed to decode packet: %s" % e)