pingsimple.cs

Csharp实例编程百例.rar

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;


namespace PingSimple
{
	/// <summary>
	/// 
	/// </summary>
	public class PingSimple
	{
		public static void Main(string[] argv)
		{
			byte[] data=new byte[1024];
			int receive;
			string tempstr;
			tempstr=argv[0];
			Socket host =new Socket(AddressFamily.InterNetwork, SocketType.Raw,ProtocolType.Icmp);
			IPEndPoint iep=new IPEndPoint(IPAddress.Parse(tempstr),0);
			EndPoint ep=(EndPoint) iep;
			ICMP packet=new ICMP();
			packet.Type=0x08;
			packet.Code=0x00;
			packet.Checksum=0;
			Buffer.BlockCopy(BitConverter.GetBytes((short)1),0,packet.Message,0,2);
			Buffer.BlockCopy(BitConverter.GetBytes((short)1),0,packet.Message,2,2);
			data=Encoding.ASCII.GetBytes("test packet");
			Buffer.BlockCopy(data,0,packet.Message,4,data.Length);
			packet.MessageSize=data.Length+4;
			int packetsize=packet.MessageSize+4;

			UInt16 chcksum=packet.getChecksum();
			packet.Checksum=chcksum;
			host.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.ReceiveTimeout,3000);
			host.SendTo(packet.getBytes(),packetsize,SocketFlags.None,iep);
			try
			{
				data=new byte[1024];
				receive=host.ReceiveFrom(data,ref ep);
			}
			catch(SocketException)
			{
				Console.WriteLine("No response from remote host");
				return;
			}
			ICMP response=new ICMP(data,receive);
			Console.WriteLine("response from:{0}",ep.ToString());
			Console.WriteLine("Type:{0}",response.Type);
			Console.WriteLine("Code:{0}",response.Code);
			int Identifier=BitConverter.ToInt16(response.Message,0);
			int Sequence=BitConverter.ToInt16(response.Message,2);
			Console.WriteLine("Identifier:{0}",Identifier);
			Console.WriteLine("Sequence:{0}",Sequence);
			string stringData=Encoding.ASCII.GetString(response.Message,4,response.MessageSize-4);
			Console.WriteLine("data:{0}",stringData);
			host.Close();
		}

	}
		
	public class ICMP
	{
		public byte Type;
		public byte Code;
		public UInt16 Checksum;
		public int MessageSize;
		public byte[] Message=new byte[1024];
		public ICMP()
		{}
		public ICMP(byte[] data,int size)
		{
			Type=data[20];
			Code=data[21];
			Checksum=BitConverter.ToUInt16(data,22);
			MessageSize=size-24;
			Buffer.BlockCopy(data,24,Message,0,MessageSize);
		}
		public byte[] getBytes()
		{
			byte[] data=new byte[MessageSize+9];
			Buffer.BlockCopy(BitConverter.GetBytes(Type),0,data,0,1);
			Buffer.BlockCopy(BitConverter.GetBytes(Code),0,data,1,1);
			Buffer.BlockCopy(BitConverter.GetBytes(Checksum),0,data,2,2);
			Buffer.BlockCopy(Message,0,data,4,MessageSize);
			return data;
		}
		public UInt16 getChecksum()
		{
			UInt32 chcksm=0;
			byte[] data=getBytes();
			int packetsize=MessageSize+8;
			int index=0;
			while(index<packetsize)
			{
				chcksm+=Convert.ToUInt32(BitConverter.ToInt16(data,index));
				index+=2;
			}
			chcksm=(chcksm>>16)+(chcksm & 0xffff);
			chcksm+=(chcksm>>16);
			return(UInt16)(~chcksm);
		}
	}
}