java - 用 Jpcap 过滤

Question

我需要使用 Jpcap 过滤 Telnet 数据包。我该怎么做？我试过:

captor.setFilter("telnet", true);

但它不起作用......

Answer 1

通过使用这样的处理程序调用捕获器实例 [captor.loopPacket(-1,handler)] :

public class TelnetReceiver implements PacketReceiver
{
    public void receivePacket(Packet p) 
    {
        if (p instanceof TCPPacket) { //Filter TCP only
            TCPPacket tcp = (TCPPacket) p;

            if(tcp.dst_port == 23 || tcp.src_port == 23)) {
                //Do something with tcp.data or other layer fields
            }
        }
    }
}