实例介绍
【实例简介】ping检测网络是否畅通
【实例截图】
【核心代码】
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 }
标签: ping
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