在C#中实现Ping
2013年04月25日
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<![CDATA[using System;<br />
using System.Drawing;<br />
using System.Collections;<br />
using System.Data;<br />
using System.Net;<br />
using System.Net.Sockets;</p>
<p>/// Ping类<br />
public class Ping<br />
{<br />
//声明常量<br />
const int SOCKET_ERROR = -1;<br />
const int ICMP_ECHO = 8;</p>
<p>// 程序入口<br />
public static void Main()<br />
{<br />
Ping p = new Ping();<br />
Console.WriteLine("请输入要 Ping 的IP或者主机名字：");<br />
string MyUrl = Console.ReadLine();<br />
Console.WriteLine("正在 Ping " + MyUrl + " ……");<br />
Console.Write(p.PingHost(MyUrl));<br />
}</p>
<p>public string PingHost(string host)<br />
{<br />
// 声明 IPHostEntry<br />
IPHostEntry serverHE, fromHE;<br />
int nBytes = 0;<br />
int dwStart = 0, dwStop = 0;</p>
<p> //初始化ICMP的Socket<br />
Socket socket =<br />
new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);<br />
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 1000);<br />
// 得到Server EndPoint<br />
try<br />
{<br />
serverHE = Dns.GetHostByName(host);<br />
}<br />
catch(Exception)<br />
{</p>
<p> return "没有发现主机";<br />
}</p>
<p> // 把 Server IP_EndPoint转换成EndPoint<br />
IPEndPoint ipepServer = new IPEndPoint(serverHE.AddressList[0], 0);<br />
EndPoint epServer = (ipepServer);</p>
<p> // 设定客户机的接收Endpoint<br />
fromHE = Dns.GetHostByName(Dns.GetHostName());<br />
IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0);<br />
EndPoint EndPointFrom = (ipEndPointFrom);</p>
<p> int PacketSize = 0;<br />
IcmpPacket packet = new IcmpPacket();</p>
<p> // 构建要发送的包<br />
packet.Type = ICMP_ECHO; //8<br />
packet.SubCode = 0;<br />
packet.CheckSum = UInt16.Parse("0");<br />
packet.Identifier = UInt16.Parse("45");<br />
packet.SequenceNumber = UInt16.Parse("0");<br />
int PingData = 32; // sizeof(IcmpPacket) - 8;<br />
packet.Data = new Byte[PingData];</p>
<p> // 初始化Packet.Data<br />
for (int i = 0; i 0)<br />
{<br />
dwStop = System.Environment.TickCount - dwStart; // stop timing<br />
return "Reply from "+epServer.ToString()+" in "<br />
+dwStop+"ms. Received: "+nBytes+ " Bytes.";</p>
<p> }<br />
timeout=System.Environment.TickCount - dwStart;<br />
if(timeout>1000)<br />
{<br />
return "超时" ;<br />
}<br />
}</p>
<p> //close the socket<br />
socket.Close();<br />
return "";<br />
}<br />
///<br />
<summary>
/// This method get the Packet and calculates the total size<br />
/// of the Pack by converting it to byte array<br />
/// </summary>
<p>public static Int32 Serialize(IcmpPacket packet, Byte[] Buffer,<br />
Int32 PacketSize, Int32 PingData )<br />
{<br />
Int32 cbReturn = 0;<br />
// serialize the struct into the array<br />
int Index=0;</p>
<p> Byte [] b_type = new Byte[1];<br />
b_type[0] = (packet.Type);</p>
<p> Byte [] b_code = new Byte[1];<br />
b_code[0] = (packet.SubCode);</p>
<p> Byte [] b_cksum = BitConverter.GetBytes(packet.CheckSum);<br />
Byte [] b_id = BitConverter.GetBytes(packet.Identifier);<br />
Byte [] b_seq = BitConverter.GetBytes(packet.SequenceNumber);</p>
<p> Array.Copy( b_type, 0, Buffer, Index, b_type.Length );<br />
Index += b_type.Length;</p>
<p> Array.Copy( b_code, 0, Buffer, Index, b_code.Length );<br />
Index += b_code.Length;</p>
<p> Array.Copy( b_cksum, 0, Buffer, Index, b_cksum.Length );<br />
Index += b_cksum.Length;</p>
<p> Array.Copy( b_id, 0, Buffer, Index, b_id.Length );<br />
Index += b_id.Length;</p>
<p> Array.Copy( b_seq, 0, Buffer, Index, b_seq.Length );<br />
Index += b_seq.Length;</p>
<p> // copy the data<br />
Array.Copy( packet.Data, 0, Buffer, Index, PingData );<br />
Index += PingData;<br />
if( Index != PacketSize/* sizeof(IcmpPacket) */)<br />
{<br />
cbReturn = -1;<br />
return cbReturn;<br />
}</p>
<p> cbReturn = Index;<br />
return cbReturn;<br />
}<br />
///<br />
<summary>
/// This Method has the algorithm to make a checksum<br />
/// </summary>
<p>public static UInt16 checksum( UInt16[] buffer, int size )<br />
{<br />
Int32 cksum = 0;<br />
int counter;<br />
counter = 0;</p>
<p> while ( size > 0 )<br />
{<br />
UInt16 val = buffer[counter];</p>
<p> cksum += Convert.ToInt32( buffer[counter] );<br />
counter += 1;<br />
size -= 1;<br />
}</p>
<p> cksum = (cksum >> 16) + (cksum & 0xffff);<br />
cksum += (cksum >> 16);<br />
return (UInt16)(~cksum);<br />
}<br />
}<br />
/// 类结束<br />
///<br />
<summary>
/// Class that holds the Pack information<br />
/// </summary>
<p>public class IcmpPacket<br />
{<br />
public Byte Type; // type of message<br />
public Byte SubCode; // type of sub code<br />
public UInt16 CheckSum; // ones complement checksum of struct<br />
public UInt16 Identifier; // identifier<br />
public UInt16 SequenceNumber; // sequence number<br />
public Byte [] Data;</p>
<p>} // class IcmpPacket<br />
]]>