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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;

namespace Ping
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	/// 

	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.RichTextBox richTextBox1;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.richTextBox1 = new System.Windows.Forms.RichTextBox();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 16);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(80, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "目标主机名：";
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(96, 16);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(152, 21);
			this.textBox1.TabIndex = 1;
			this.textBox1.Text = "127.0.0.1";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(256, 16);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(96, 23);
			this.button1.TabIndex = 2;
			this.button1.Text = "Ping";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// richTextBox1
			// 
			this.richTextBox1.Location = new System.Drawing.Point(8, 48);
			this.richTextBox1.Name = "richTextBox1";
			this.richTextBox1.Size = new System.Drawing.Size(344, 184);
			this.richTextBox1.TabIndex = 3;
			this.richTextBox1.Text = "";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(360, 238);
			this.Controls.Add(this.richTextBox1);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.label1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示执行PING";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
		//声明常量
		const int SOCKET_ERROR = -1;        
		const int ICMP_ECHO = 8;
		public static Int32 Serialize(  IcmpPacket packet, Byte [] Buffer, Int32 PacketSize, Int32 PingData )
		{// 取得报文内容，转化为字节数组，然后计算报文的长度	
			Int32 cbReturn = 0;
			//数据报结构转化为数组
			int Index=0;
			Byte [] b_type = new Byte[1];
			b_type[0] = (packet.Type);
			Byte [] b_code = new Byte[1];
			b_code[0] = (packet.SubCode);
			Byte [] b_cksum = BitConverter.GetBytes(packet.CheckSum);
			Byte [] b_id = BitConverter.GetBytes(packet.Identifier);
			Byte [] b_seq = BitConverter.GetBytes(packet.SequenceNumber);
			Array.Copy( b_type, 0, Buffer, Index, b_type.Length );
			Index  = b_type.Length;
			Array.Copy( b_code, 0, Buffer, Index, b_code.Length );
			Index  = b_code.Length;
			Array.Copy( b_cksum, 0, Buffer, Index, b_cksum.Length );
			Index  = b_cksum.Length;
			Array.Copy( b_id, 0, Buffer, Index, b_id.Length );
			Index  = b_id.Length;
			Array.Copy( b_seq, 0, Buffer, Index, b_seq.Length );
			Index  = b_seq.Length;
			// 复制数据	        
			Array.Copy( packet.Data, 0, Buffer, Index, PingData );
			Index  = PingData;
			if( Index != PacketSize/* sizeof(IcmpPacket)  */) 
			{
				cbReturn = -1;
				return cbReturn;
			}
			cbReturn = Index;
			return cbReturn;
		}
		/// <summary>
		///		校验和算法
		/// </summary>
		public static UInt16 checksum( UInt16[] buffer, int size )
		{
			Int32 cksum = 0;
			int counter;
			counter = 0;
			/*把ICMP报头二进制数据以2字节为单位累加起来*/
			while ( size > 0 ) 
			{
				UInt16 val = buffer[counter];
				cksum  = Convert.ToInt32( buffer[counter] );
				counter  = 1;
				size -= 1;
			}
			/*	若ICMP报头为奇数个字节，会剩下最后一字节。把最后一个字节视为一个
			 *	2字节数据的高字节，这个2字节数据的低字节为0，继续累加*/
			cksum = (cksum >> 16)   (cksum & 0xffff);
			cksum  = (cksum >> 16);
			return (UInt16)(~cksum);
		}
		private void button1_Click(object sender, System.EventArgs e)
		{//执行PING
			this.richTextBox1.Text="";
			for(int p=0;p<10;p  )
			{
				try
				{
					string HostName=this.textBox1.Text;
					int nBytes = 0;
					int dwStart = 0, dwStop = 0;
					//初始化一个ICMP类型的Socket
					Socket socket = new Socket(AddressFamily.InterNetwork , SocketType.Raw, ProtocolType.Icmp);
					//取得目标主机的主机名
					IPHostEntry serverHE= Dns.GetHostByName(HostName);					
					IPEndPoint ipepServer = new IPEndPoint(serverHE.AddressList[0], 0);
					EndPoint epServer = (ipepServer);	
					IPHostEntry fromHE = Dns.GetHostByName(Dns.GetHostName());
					IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0);
					EndPoint EndPointFrom = (ipEndPointFrom);
					int PacketSize = 0;
					IcmpPacket packet = new IcmpPacket();
					// 构造数据报
					packet.Type = ICMP_ECHO; 
					packet.SubCode = 0;
					packet.CheckSum = UInt16.Parse("0");
					packet.Identifier   = UInt16.Parse("45"); 
					packet.SequenceNumber  = UInt16.Parse("0"); 
					int PingData = 32; // sizeof(IcmpPacket) - 8;
					packet.Data = new Byte[PingData];
					//初始化 Packet.Data
					for (int i = 0; i < PingData; i  )
					{
						packet.Data[i] = (byte)'#';
					}
					//保存数据报的长度
					PacketSize = PingData   8;
					Byte [] icmp_pkt_buffer = new Byte[ PacketSize ]; 
					Int32 Index = 0;
					//调用Serialize方法
					//报文总共的字节数
					Index = Serialize(  
						packet, 
						icmp_pkt_buffer, 
						PacketSize, 
						PingData );
					if( Index == -1 )
					{
						this.richTextBox1.Text ="报文大小有错!\n";
						return ;
					}
					// 转化为Uint16类型的数组,取得数据报长度的一半
					Double double_length = Convert.ToDouble(Index);
					Double dtemp = Math.Ceiling( double_length / 2);
					int cksum_buffer_length = Convert.ToInt32(dtemp);
					//生成一个字节数组
					UInt16 [] cksum_buffer = new UInt16[cksum_buffer_length];
					//初始化 Uint16类型 array 
					int icmp_header_buffer_index = 0;
					for( int i = 0; i < cksum_buffer_length; i   ) 
					{
						cksum_buffer[i] = 
							BitConverter.ToUInt16(icmp_pkt_buffer,icmp_header_buffer_index);
						icmp_header_buffer_index  = 2;
					}
					//调用checksum，返回检查和
					UInt16 u_cksum = checksum(cksum_buffer, cksum_buffer_length);
					//检查和存在报文中
					packet.CheckSum  = u_cksum; 
					Byte [] sendbuf = new Byte[ PacketSize ]; 
					//再次检查报文大小
					Index = Serialize(  
						packet, 
						sendbuf, 
						PacketSize, 
						PingData );
					//如果有错,则报告错误
					if( Index == -1 )
					{
						this.richTextBox1.Text ="报文大小有错!\n";
						return ;
					}      
					dwStart = System.Environment.TickCount; // 开始时间
					//用socket发送数据报
					if ((nBytes = socket.SendTo(sendbuf, PacketSize, 0, epServer)) == SOCKET_ERROR) 
					{		
						this.richTextBox1.Text ="不能发送数据包！ \n";
					}
					//初始化缓冲区.接受缓冲区			
					// ICMP 头 ＋IP 头 (20 字节)
					Byte [] ReceiveBuffer = new Byte[256]; 
					nBytes = 0;
					//接受字节流
					bool recd =false ;
					int timeout=0 ;
					//循环检查目标主机响应时间
					while(!recd)
					{
						nBytes = socket.ReceiveFrom(ReceiveBuffer, 256, 0, ref EndPointFrom);
						if (nBytes == SOCKET_ERROR) 
						{
							this.richTextBox1.Text ="目标主机没有响应!\n" ;
							recd=true ;
							break;
						}
						else if(nBytes>0)
						{
							dwStop = System.Environment.TickCount - dwStart; 
							this.richTextBox1.Text ="数据来自主机： " this.textBox1.Text "，收到的字节数："   nBytes   "， 耗时：" dwStop   "ms \n";
							recd=true;
							break;
						}
						timeout=System.Environment.TickCount - dwStart;
						if(timeout>1000)
						{
							this.richTextBox1.Text ="连接超时！ \n" ;
							recd=true;
						}					
					}
					//关闭socket
					socket.Close();     		
				}
				catch(Exception Err)
				{
					MessageBox.Show("PING目标主机操作失败!错误信息是：" Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
					return;
				}
			}
		}
	}
	public class IcmpPacket 
	{ 
		public Byte  Type;				// 消息类型
		public Byte  SubCode;			// 子码类型
		public UInt16 CheckSum;			// 校检和
		public UInt16 Identifier;		// 标志符
		public UInt16 SequenceNumber;   // 顺序号  
		public Byte [] Data;			// 数据
	} // ICMP包
}