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   源码介绍

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Net;
using System.Net.Sockets;

namespace Tracert
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        public class IcmpPacket
        {
            private Byte _type;
            private Byte _subCode;
            private UInt16 _checkSum;
            private UInt16 _identifier;
            private UInt16 _sequenceNumber;
            private Byte[] _data;

            public IcmpPacket(Byte type, Byte subCode, UInt16 checkSum, UInt16 identifier, UInt16 sequenceNumber, int dataSize)
            {
                _type = type;
                _subCode = subCode;
                _checkSum = checkSum;
                _identifier = identifier;
                _sequenceNumber = sequenceNumber;
                _data = new Byte[dataSize];
                for (int i = 0; i < dataSize; i  )
                {
                    _data[i] = (byte)'#';
                }
            }

            public UInt16 CheckSum
            {
                get
                {
                    return _checkSum;
                }
                set
                {
                    _checkSum = value;
                }
            }
            //初始化ICMP报文
            public int CountByte(Byte[] buffer)
            {
                Byte[] b_type = new Byte[1] { _type };
                Byte[] b_code = new Byte[1] { _subCode };
                Byte[] b_cksum = BitConverter.GetBytes(_checkSum);
                Byte[] b_id = BitConverter.GetBytes(_identifier);
                Byte[] b_seq = BitConverter.GetBytes(_sequenceNumber);
                int i = 0;
                Array.Copy(b_type, 0, buffer, i, b_type.Length);
                i  = b_type.Length;
                Array.Copy(b_code, 0, buffer, i, b_code.Length);
                i  = b_code.Length;
                Array.Copy(b_cksum, 0, buffer, i, b_cksum.Length);
                i  = b_cksum.Length;
                Array.Copy(b_id, 0, buffer, i, b_id.Length);
                i  = b_id.Length;
                Array.Copy(b_seq, 0, buffer, i, b_seq.Length);
                i  = b_seq.Length;
                Array.Copy(_data, 0, buffer, i, _data.Length);
                i  = _data.Length;
                return i;
            }
            //将ICMP报文转化为Byte数据包
            public static UInt16 SumOfCheck(UInt16[] buffer)
            {
                int cksum = 0;
                for (int i = 0; i < buffer.Length; i  )
                {
                    cksum  = (int)buffer[i];
                }
                cksum = (cksum >> 16)   (cksum & 0xffff);
                cksum  = (cksum >> 16);
                return (UInt16)(~cksum);
            }
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            listBox1.Items.Clear();
            try
            {
                if (textBox1.Text.Length == 0)
                {
                    listBox1.Items.Add("请键入IP地址");
                    textBox1.Focus();
                    return;
                }
                Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
                //创建接收和发送ICMP报文的Socket
                IPEndPoint ipDEST = new IPEndPoint(Dns.Resolve(textBox1.Text).AddressList[0], 30);
                //设定服务器端30端口号对应的网络节点
                IPEndPoint ipSRC = new IPEndPoint(Dns.GetHostByName(Dns.GetHostName()).AddressList[0], 30);
                EndPoint epSRC = (EndPoint)ipSRC;
                int DataSize = 4;//ICMP报文中的数据长度
                int PacketSize = DataSize   8;//报文总长度
                const int ICMP_ECHO = 8;
                IcmpPacket packet = new IcmpPacket(ICMP_ECHO, 0, 0, 45, 0, DataSize);
                Byte[] Buffer = new Byte[PacketSize];
                int index = packet.CountByte(Buffer);
                if (index != PacketSize)
                {
                    listBox1.Items.Add("报文有问题");
                    return;
                }
                int cksum_buffer_length = (int)Math.Ceiling(((Double)index) / 2);
                UInt16[] cksum_buffer = new UInt16[cksum_buffer_length];
                int icmp_header_buffer_index = 0;
                for (int i = 0; i < cksum_buffer_length; i  )
                {
                    cksum_buffer[i] = BitConverter.ToUInt16(Buffer, icmp_header_buffer_index);
                    icmp_header_buffer_index  = 2;
                }
                //将校验和保存在报文中
                packet.CheckSum = IcmpPacket.SumOfCheck(cksum_buffer);
                //保存校验和后，再次将报文转化为数据包
                Byte[] ByteSend = new Byte[PacketSize];
                index = packet.CountByte(ByteSend);
                if (index != PacketSize)
                {
                    listBox1.Items.Add("报文有问题");
                    return;
                }
                //发送不同TTL值的数据包
                for (int ittl = 1; ittl <= 255; ittl  )
                {
                    Byte[] ByteRecv = new Byte[256];
                    s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.IpTimeToLive, ittl);
                    s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 10000);
                    s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 10000);
                    DateTime dt = DateTime.Now;
                    int iRet = s.SendTo(ByteSend, ByteSend.Length, SocketFlags.None, ipDEST);
                    //发送ICMP报文
                    if (iRet == -1)
                    {
                        listBox1.Items.Add("发送数据出错");
                    }
                    iRet = s.ReceiveFrom(ByteRecv, ByteRecv.Length, SocketFlags.None, ref epSRC);
                    TimeSpan ts = DateTime.Now - dt;
                    //检测回应是否正确
                    if (iRet == -1)
                    {
                        listBox1.Items.Add("接收数据出错");
                    }
                    listBox1.Items.Add("TTL="   ittl.ToString()   "IP="   ((IPEndPoint)epSRC).Address.ToString()   "Time="   ts.Milliseconds.ToString());
                    //判断是否到达目标地址
                    if (Dns.GetHostEntry(textBox1.Text).AddressList[0].ToString() == ((IPEndPoint)epSRC).Address.ToString())
                    {
                        break;
                    }
                    //超时错误
                    if (ByteRecv[20] != 11)
                    {
                        listBox1.Items.Add("超时，请重试");
                        break;
                    }
                }
            }
            catch (SocketException b)
            {
                MessageBox.Show(b.Message);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}