/// This method gets the packet and calculates the total size /// of the packet by converting it to byte array public static Int32 Serialize(IcmpPacket packet, Byte [] Buffer, Int32 PacketSize, Int32 PingData) { Int32 cbReturn = 0; // Serialize the struct into the array 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); // Serialize type Array.Copy(b_type, 0, Buffer, Index, b_type.Length); Index += b_type.Length; // Serialize subcode Array.Copy(b_code, 0, Buffer, Index, b_code.Length); Index += b_code.Length; // Serialize cksum Array.Copy(b_cksum, 0, Buffer, Index, b_cksum.Length); Index += b_cksum.Length; // Serialize id 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; // Copy the data Array.Copy(packet.Data, 0, Buffer, Index, PingData); Index += PingData; if (Index != PacketSize /* sizeof(IcmpPacket) */) { cbReturn = -1; return(cbReturn); } cbReturn = Index; return(cbReturn); }
public static void TraceHost(string host) { // Declare the IPHostEntry IPHostEntry serverHE, fromHE; int nBytes = 0; int dwStart = 0, dwStop = 0; //Initialize a Socket of the Type ICMP Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp); // Get the server endpoint try { serverHE = Dns.GetHostByName(host); } catch (Exception) { Console.WriteLine("Host not found"); return; } // Convert the server IP_EndPoint to an EndPoint IPEndPoint ipepServer = new IPEndPoint(serverHE.AddressList[0], 0); EndPoint epServer = (ipepServer); // Set the receiving endpoint to the client machine fromHE = Dns.GetHostByName(Dns.GetHostName()); IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0); EndPoint EndPointFrom = (ipEndPointFrom); int PacketSize = 0; IcmpPacket packet = new IcmpPacket(); // Construct the packet to send packet.Type = 8; //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]; // Initialize the Packet.Data for (int i = 0; i < PingData; i++) { packet.Data[i] = (byte)'#'; } // Variable to hold the total packet size PacketSize = PingData + 8; Byte [] icmp_pkt_buffer = new Byte[PacketSize]; Int32 Index = 0; // the total number of bytes in the packet Index = Serialize(packet, icmp_pkt_buffer, PacketSize, PingData); // Error in packet size if (Index == -1) { Console.WriteLine("Error in Making Packet"); return; } for (int ittl = 1; ittl <= 256; ittl++) { Byte[] ByteRecv = new Byte[256]; // Socket options to set TTL and Timeouts socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.IpTimeToLive, ittl); socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 10000); socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 10000); // Get current time DateTime dt = DateTime.Now; // Send request int iRet = socket.SendTo(icmp_pkt_buffer, icmp_pkt_buffer.Length, SocketFlags.None, epServer); // Check for Win32 SOCKET_ERROR if (iRet == -1) { Console.WriteLine("error sending data"); } // Receive iRet = socket.ReceiveFrom(ByteRecv, ByteRecv.Length, SocketFlags.None, ref EndPointFrom); // Calculate time required TimeSpan ts = DateTime.Now - dt; // Check if response is OK if (iRet == -1) { Console.WriteLine("error getting data"); } Console.WriteLine("TTL= {0,-5} IP= {1,-20}Time={2,3}ms", ittl, ((IPEndPoint)epServer) .Address, ts.Milliseconds); if ((iRet == 32 + 8 + 20) && (BitConverter.ToInt16(ByteRecv, 24) == BitConverter.ToInt16(icmp_pkt_buffer, 4)) && (ByteRecv[20] == 0)) { break; } // Time out if (ByteRecv[20] != 11) { Console.WriteLine("Unexpected Error"); break; } } // Close the socket socket.Close(); }
/// This method takes the hostname of the server /// and then it pings it and shows the response time public static void PingHost(string host) { // Declare the IPHostEntry IPHostEntry serverHE, fromHE; int nBytes = 0; int dwStart = 0, dwStop = 0; // Initialize a socket of the type ICMP Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp); // Get the server endpoint try { serverHE = Dns.GetHostByName(host); } catch (Exception) { Console.WriteLine("Host not found"); // fail return; } // Convert the server IP_EndPoint to an EndPoint IPEndPoint ipepServer = new IPEndPoint(serverHE.AddressList[0], 0); EndPoint epServer = (ipepServer); // Set the receiving endpoint to the client machine fromHE = Dns.GetHostByName(Dns.GetHostName()); IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0); EndPoint EndPointFrom = (ipEndPointFrom); int PacketSize = 0; IcmpPacket packet = new IcmpPacket(); // Construct the packet to send packet.Type = 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]; // Initialize the Packet.Data for (int i = 0; i < PingData; i++) { packet.Data[i] = (byte)'#'; } // Variable to hold the total packet size PacketSize = PingData + 8; Byte [] icmp_pkt_buffer = new Byte[PacketSize]; Int32 Index = 0; // Call the Serialize method you built earlier which // counts the total number of bytes in the packet Index = Serialize(packet, icmp_pkt_buffer, PacketSize, PingData); if (Index == -1) { // Error in packet size Console.WriteLine("Error in Making Packet"); return; } // Now get this critter into a UInt16 array // Get the half size of the packet Double double_length = Convert.ToDouble(Index); Double dtemp = System.Math.Ceiling(double_length / 2); int cksum_buffer_length = Convert.ToInt32(dtemp); // Create a byte array UInt16 [] cksum_buffer = new UInt16[cksum_buffer_length]; // Code to initialize the Uint16 array 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; } // Call the checksum method you built, which will // return a checksum UInt16 u_cksum = checksum(cksum_buffer, cksum_buffer_length); // Save the checksum to the Packet packet.CheckSum = u_cksum; // Now that you have the checksum, serialize the packet again Byte [] sendbuf = new Byte[PacketSize]; // Again check the packet size Index = Serialize(packet, sendbuf, PacketSize, PingData); // If there is a error report it if (Index == -1) { Console.WriteLine("Error in Making Packet"); return; } // Start timing dwStart = System.Environment.TickCount; // Send the packet over the socket try { if ((nBytes = socket.SendTo(sendbuf, PacketSize, 0, epServer)) == -1) { Console.WriteLine("Socket Error cannot Send Packet"); } } // Gracefully handle host unreachable situations catch (SocketException ex) { if (ex.ErrorCode == 10065) { Console.WriteLine("Destination host unreachable."); } } // Initialize the buffers. // The receive buffer is the size of the // ICMP header plus the IP header (20 bytes) Byte [] ReceiveBuffer = new Byte[256]; nBytes = 0; // Receive the bytes bool recd = false; int timeout = 0; // Loop for checking the time of the server responding while (!recd) { nBytes = socket.ReceiveFrom (ReceiveBuffer, 256, 0, ref EndPointFrom); if (nBytes == -1) { Console.WriteLine("Host not responding"); recd = true; break; } else if (nBytes > 0) { // Stop timing dwStop = System.Environment.TickCount - dwStart; Console.WriteLine("Reply from " + epServer.ToString() + " in " + dwStop + "ms :Bytes Received: " + nBytes); recd = true; break; } // Time out check timeout = System.Environment.TickCount - dwStart; if (timeout > 1000) { Console.WriteLine("Time Out"); recd = true; } } // Close the socket socket.Close(); }