Question

这是我的第一个问题，所以要温柔！

最近我尝试构建可以接受Wireshark文件并将所有数据包发送到网络的应用程序，经过几天的阅读我发现Pcap.Net项目并在构建我的应用程序（winform）之后我想添加高级选项比如改变IP地址，MAC地址等.Pcap.Net支持这一切。在我的例子中，在分配缓冲区之后我尝试更改数据包ip，构建新数据包（使用新的ip）并使用我文件中的所有数据包填充缓冲区（发送前）：

// Allocate a send buffer
using (PacketSendBuffer sendBuffer = new PacketSendBuffer((uint)capLength))
{
    // Fill the buffer with the packets from the file
    int numPackets = 0;
    Packet packet;
    while (inputCommunicator.ReceivePacket(out packet) == PacketCommunicatorReceiveResult.Ok)
    {
        IpV4Layer ipLayer = (IpV4Layer)packet.Ethernet.IpV4.ExtractLayer();
        ipLayer.Destination = new IpV4Address("11.12.13.14");
        EthernetLayer ethernet = (EthernetLayer)packet.Ethernet.ExtractLayer();
        PayloadLayer payload = (PayloadLayer)packet.Ethernet.Payload.ExtractLayer();
        Packet newPacket = PacketBuilder.Build(DateTime.Now, ethernet, ipLayer, ipLayer, payload);
        sendBuffer.Enqueue(newPacket);
        ++numPackets;
    }

    outputCommunicator.Transmit(sendBuffer, isSync); //Transmit the queue
}

我的问题是在行sendBuffer.Enqueue(newPacket)之后。

我收到以下错误：Failed enqueueing to SendQueue

也许somone可以帮我理解什么是错的？

Answer 1

PayloadLayer payload = (PayloadLayer)packet.Ethernet.Payload.ExtractLayer();
// and
Packet newPacket = PacketBuilder.Build(DateTime.Now, ethernet, ipLayer, ipLayer, payload);

应该是

PayloadLayer payload = (PayloadLayer)packet.Ethernet.IpV4.Payload.ExtractLayer();
// and
Packet newPacket = PacketBuilder.Build(DateTime.Now, ethernet, ipLayer, payload);

我做了什么

提取ip有效负载，因为ethernetpayload包含您已经提取的iplayer
只添加iplayer一次

尝试更改数据包IP并将其发送出去

1 个答案: