java - jpcap 在熟模式下发送数据包时出错

Question

我想使用 jpcap 发送 UDP 数据包。

我的代码是:

    PcapNetworkInterface nif = Pcaps.getDevByName(args[0]); 
    int snapLen = 65536;
    PromiscuousMode mode = PromiscuousMode.NONPROMISCUOUS;
    int timeout = 10000;
    PcapHandle handle = nif.openLive(snapLen, mode, timeout);

    UdpPort srcPort = new UdpPort((short)1002,"");
    UdpPort dstPort = new UdpPort((short)2001, "");;
    short length = (short)12; 
    short checksum = (short)0xABCD; 



    UnknownPacket.Builder unknownb = new UnknownPacket.Builder(); 
    unknownb.rawData(new byte[] { (byte)0, (byte)1, (byte)2, (byte)3 }); 

    UdpPacket.Builder b = new UdpPacket.Builder(); 
    b.dstPort(dstPort) 
     .srcPort(srcPort) 
     .length(length) 
     .checksum(checksum) 
     .correctChecksumAtBuild(false) 
     .correctLengthAtBuild(false) 
     .payloadBuilder(unknownb); 

    EthernetPacket.Builder etherBuilder = new EthernetPacket.Builder();
    etherBuilder.dstAddr(MacAddress.getByName("FF:FF:FF:FF:FF:FF"))
                .srcAddr(MacAddress.getByName("FF:FF:FF:FF:FF:FF"))
                .type( EtherType.IPV4) // 
                .payloadBuilder(b) 
                .paddingAtBuild(true);


    Packet p = etherBuilder.build(); 


    int i=1;
    while(true) {

        handle.sendPacket(p); 
        System.out.println("send "+i);i++;
        try { 
          Thread.sleep(1000); 
        } catch (InterruptedException e) { 

        } 
    }

执行后，我得到:

org.pcap4j.core.PcapNativeException:pcap_sendpacket() 中发生错误:Cook 模式不支持发送数据包 在 org.pcap4j.core.PcapHandle.sendPacket(PcapHandle.java:1242) 在 org.pcap4j.core.PcapHandle.sendPacket(PcapHandle.java:1212)

这是 C 实现的链接:

https://github.com/frgtn/rpcapd-linux/blob/master/libpcap/pcap-linux.c#L1091

Answer 1

我用过https://gist.github.com/austinmarton/1922600

或其他与 jpcap 一起工作的接口(interface)