C# 基于SharpPcap的局域网数据包捕获 之二 监听代码

1.配置好sharpPcap引用和安装好winPcap后，添加引用

using PacketDotNet;
using SharpPcap;
using SharpPcap.AirPcap;
using SharpPcap.LibPcap;
using SharpPcap.WinPcap;

2.获取网卡，至于为什么会有两个注释掉的获取网卡方法。三种都可以获取到网卡，然而LibPcapLiveDeviceList获取网卡可以直观的看到它的名字，三种方法并没有多大区别（主要是忘记了实际区别）

        private void getAdapter()//获取网卡 
        {
            var devices = LibPcapLiveDeviceList.Instance;
            //var devices = WinPcapDeviceList.Instance;
            //var devices = CaptureDeviceList.Instance;
            if (devices.Count < 1)
                MessageBox.Show("此设备上没有网卡");
            else 
                foreach (var dev in devices)
                {
                    selectAdp.Items.Add(dev.Interface.FriendlyName);
                    selectAdp.SelectedIndex = 0;
                }
        }

3.开始监听，device_OnPackArrival是一个监听事件（方法），会在下面贴出。device.Open(DeviceMode.Promiscuous, 1000);是选择混淆模式监听

        private void monitor()//监听  
        {
            var devices = LibPcapLiveDeviceList.Instance;
            //var devices = CaptureDeviceList.Instance;
            foreach(PcapDevice dev in devices)
            {
                if (dev.Interface.FriendlyName.ToString() == selectedAdp)
                {
                    //MessageBox.Show("pair");
                    PcapDevice device = dev;
                    device.OnPacketArrival += new PacketArrivalEventHandler(device_OnPackArrival);
                    device.Open(DeviceMode.Promiscuous, 1000);
                    //device.Capture(20);
                    device.StartCapture();
                }
            }
        }

4.device_OnPackArrival方法

        private void device_OnPackArrival(object sender,CaptureEventArgs e)//接收到包的处理
        {
            var packet = PacketDotNet.Packet.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);//解析出基本包
            var dlpacket = PacketDotNet.DataLinkPacket.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);//协议类别
            var ipPacket = PacketDotNet.IpPacket.GetEncapsulated(packet);//IP数据包   
            var udpPacket = PacketDotNet.UdpPacket.GetEncapsulated(packet);//UDP数据包 
            var tcpPacket = PacketDotNet.TcpPacket.GetEncapsulated(packet);//TCP数据包
            //MessageBox.Show("????/");
            if (IP.Checked)
                //MessageBox.Show("tp");
                showIPPacket(ipPacket);
            else if (UDP.Checked)
                // MessageBox.Show("UPD");
                showUDPPacket(udpPacket);
            else if (TCP.Checked)
                showTCPPacket(tcpPacket);
        }

5.packet包属性，部分属性如下

               int srcPort = p.SourcePort;
                int destPort = p.DestinationPort;
                string details = p.ToString();

上面就是完整的选择网卡--开始监听--监听到包 的一个流程