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 ); } Windows 窗体设计器生成的代码#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
}
