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| 关键词： nbsp Index Length packet public Byte Buffer WriteLine code Console |
// ping ***.***.***.*** using System;using System.IO;using System.Net;using System.Net.Sockets; namespace Ping{ /// <summary> /// Ping 的摘要说明。 /// </summary> /// public class IcmpPacket { public Byte Type; //消息类型; public Byte SubCode; //子类型代码 public UInt16 CheckSum; //校验和 public UInt16 Identifier; //标识 public UInt16 SequenceNumber; //序号 public Byte [] Data; //数据包 }//class IcmPacket class Ping { const int SOCKET_ERROR = -1; const int ICMP_ECHO = 8; /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] public static void Main(string[] argv) { // // TODO: 在此处添加代码以启动应用程序 // 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"); //fall 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]; //在数据中，写入指定的数据大小 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 Marking 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) {//初始化ICMP报文 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_ckssum = BitConverter.GetBytes(packet.CheckSum); Byte [] b_id = BitConverter.GetBytes(packet.Identifier); Byte [] b_seq = BitConverter.GetBytes(packet.SequenceNumber); Array.Copy(b_code,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_code,0,Buffer,Index,b_ckssum.Length); Index += b_ckssum.Length; Array.Copy(b_code,0,Buffer,Index,b_id.Length); Index += b_id.Length; Array.Copy(b_code,0,Buffer,Index,b_seq.Length); Index += b_seq.Length; Array.Copy(b_code,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) { //将整个ICMP报文信息和数据转化为Byte数据包 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); } }} |
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