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   源码介绍

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ping检测网络是否畅通

namespace MyPing
{
	using System;
	using System.Net;
	using System.Net.Sockets;
	public class IcmpPacket
	{
		public Byte  Type;    // type of message
		public Byte  SubCode;    // type of sub code
		public UInt16 CheckSum;   // ones complement checksum of struct
		public UInt16 Identifier;      // identifier
		public UInt16 SequenceNumber;     // sequence number
		public Byte [] Data;
	} // class IcmpPacket
	class Ping
	{
		const int SOCKET_ERROR = -1;
		const int ICMP_ECHO = 8;
		public static void Main(string[] argv)
		{
			if(argv.Length==0)
			{
				Console.WriteLine("Usage:Ping <hostname> -t") ;
				Console.WriteLine("<hostname> The name of the Host who you want to ping");
				Console.WriteLine("-t Optional Switch to Ping the host continuously") ;
			}
			else if(argv.Length==1)
			{
				PingHost(argv[0]) ;
			}
			else if(argv.Length==2)
			{
				if(argv[1]=="-t")
				{
					while(true)
					{
						PingHost(argv[0]) ;
					}
				}
				else
				{
					PingHost(argv[0]) ;
				}
			}
			else
			{
				Console.WriteLine("Error in Arguments") ;
			}
		}
		public static void PingHost(string host)
		{
			IPHostEntry serverHE, fromHE;
			int nBytes = 0;
			int dwStart = 0, dwStop = 0;
			Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
			try
			{
				serverHE = Dns.GetHostByName(host);
			}
			catch(Exception)
			{
				Console.WriteLine("Host not found"); // fail
				return ;
			}
			IPEndPoint ipepServer = new IPEndPoint(serverHE.AddressList[0], 0);
			EndPoint epServer = (ipepServer);
			fromHE = Dns.GetHostByName(Dns.GetHostName());
			IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0);
			EndPoint EndPointFrom = (ipEndPointFrom);
			int PacketSize = 0;
			IcmpPacket packet = new IcmpPacket();
			packet.Type = ICMP_ECHO; //8
			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];
			for (int i = 0; i < PingData; i  )
				packet.Data[i] = (byte)'#';
			PacketSize = PingData   8;
			Byte [] icmp_pkt_buffer = new Byte[ PacketSize ];
			Int32 Index = 0;
			Index = Serialize(packet,icmp_pkt_buffer,PacketSize,PingData);
			if( Index == -1 )
			{
				Console.WriteLine("Error in Making Packet");
				return ;
			}
			Double double_length = Convert.ToDouble(Index);
			Double dtemp = Math.Ceiling( double_length / 2);
			int cksum_buffer_length = Convert.ToInt32(dtemp);
			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(icmp_pkt_buffer,icmp_header_buffer_index);
				icmp_header_buffer_index  = 2;
			}
			UInt16 u_cksum = checksum(cksum_buffer, cksum_buffer_length);
			packet.CheckSum  = u_cksum;
			Byte [] sendbuf = new Byte[ PacketSize ];
			Index = Serialize(packet,sendbuf,PacketSize,PingData);
			if( Index == -1 )
			{
				Console.WriteLine("Error in Making Packet");
				return ;
			}
			dwStart = System.Environment.TickCount; // Start timing
			if ((nBytes = socket.SendTo(sendbuf, PacketSize, 0, epServer)) == SOCKET_ERROR)
			{
				Console.WriteLine("Socket Error cannot Send Packet");
			}
			Byte [] ReceiveBuffer = new Byte[256];
			nBytes = 0;
			bool recd =false ;
			int timeout=0 ;
			while(!recd)
			{
				nBytes = socket.ReceiveFrom(ReceiveBuffer, 256, 0, ref EndPointFrom);
				if (nBytes == SOCKET_ERROR)
				{
					Console.WriteLine("Host not Responding") ;
					recd=true ;
					break;
				}
				else if(nBytes>0)
				{
					dwStop = System.Environment.TickCount - dwStart; // stop timing
					Console.WriteLine("Reply from " epServer.ToString() " in " dwStop "MS,\tBytes Received :" nBytes);
					recd=true;
					break;
				}
				timeout=System.Environment.TickCount - dwStart;
				if(timeout>1000)
				{
					Console.WriteLine("Time Out") ;
					recd=true;
				}
			}
			socket.Close();
		}
		public static Int32 Serialize(  IcmpPacket packet, Byte [] Buffer, Int32 PacketSize, Int32 PingData )
		{
			Int32 cbReturn = 0;
			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;
			Array.Copy( packet.Data, 0, Buffer, Index, PingData );
			Index  = PingData;
			if( Index != PacketSize )
			{
				cbReturn = -1;
				return cbReturn;
			}
			cbReturn = Index;
			return cbReturn;
		}
		public static UInt16 checksum( UInt16[] buffer, int size )
		{
			Int32 cksum = 0;
			int counter;
			counter = 0;
			while ( size > 0 )
			{
				UInt16 val = buffer[counter];
				cksum  = Convert.ToInt32( buffer[counter] );
				counter  = 1;
				size -= 1;
			}
			cksum = (cksum >> 16)   (cksum & 0xffff);
			cksum  = (cksum >> 16);
			return (UInt16)(~cksum);
		}
	} // class ping
}