using System; using System.Collections; using System.Collections.Generic; using UnityEngine; using System.Net; using System.Net.Sockets; namespace ThinkingSDK.PC.Time { public class ThinkingSDKNTPCalibration : ThinkingSDKTimeCalibration { public ThinkingSDKNTPCalibration(string ntpServer) { double totalMilliseconds = ConvertDateTimeInt(DateTime.UtcNow); this.mStartTime = (long)totalMilliseconds; this.mSystemElapsedRealtime = Environment.TickCount; // request scoket time Socket socket = GetNetworkTimeSync(ntpServer, this); // set scoket timeout TDTimeout.SetTimeout(3, new Action(ScoketTimeout), (object)socket); } private void ScoketTimeout(object obj) { if (obj is Socket) { Socket socket = (Socket)obj; if (socket.Connected == true) { socket.Close(); } } } private static double ConvertDateTimeInt(System.DateTime time) { DateTime startTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc); return (double)(time - startTime).TotalMilliseconds; } private static Socket GetNetworkTimeSync(string ntpServer, ThinkingSDKTimeCalibration timeCalibration) { // NTP message size - 16 bytes of the digest (RFC 2030) var ntpData = new byte[48]; //Setting the Leap Indicator, Version Number and Mode values ntpData[0] = 0x1B; //LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode) var addresses = Dns.GetHostEntry(ntpServer).AddressList; //The UDP port number assigned to NTP is 123 var ipEndPoint = new IPEndPoint(addresses[0], 123); //NTP uses UDP var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); socket.Connect(ipEndPoint); SocketAsyncEventArgs socketAsyncEventArgs = new SocketAsyncEventArgs(); socketAsyncEventArgs.SetBuffer(ntpData, 0, ntpData.Length); socketAsyncEventArgs.UserToken = timeCalibration; socketAsyncEventArgs.RemoteEndPoint = ipEndPoint; socketAsyncEventArgs.Completed += SocketAsyncEventArgs_Completed; // send socket request socket.SendAsync(socketAsyncEventArgs); return socket; } private static void SocketAsyncEventArgs_Completed(object sender, SocketAsyncEventArgs eventArgs) { Socket socket = (Socket)sender; if (eventArgs.SocketError == SocketError.Success) { if (eventArgs.LastOperation == SocketAsyncOperation.Send) { socket.ReceiveAsync(eventArgs); } else if (eventArgs.LastOperation == SocketAsyncOperation.Receive) { if (eventArgs.SocketError == SocketError.Success && eventArgs.Buffer.Length > 0) { DateTime ntpTime = ParseDateTimeWithNTPData(eventArgs.Buffer); double totalMilliseconds = ConvertDateTimeInt(ntpTime); ThinkingSDKTimeCalibration timeCalibration = (ThinkingSDKTimeCalibration)eventArgs.UserToken; timeCalibration.mStartTime = (long)totalMilliseconds; } socket.Close(); } else { socket.Close(); } } else { socket.Close(); } } static uint SwapEndianness(ulong x) { return (uint)(((x & 0x000000ff) << 24) + ((x & 0x0000ff00) << 8) + ((x & 0x00ff0000) >> 8) + ((x & 0xff000000) >> 24)); } private static DateTime ParseDateTimeWithNTPData(byte[] ntpData) { //Offset to get to the "Transmit Timestamp" field (time at which the reply //departed the server for the client, in 64-bit timestamp format." const byte serverReplyTime = 40; //Get the seconds part ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime); //Get the seconds fraction ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4); //Convert From big-endian to little-endian intPart = SwapEndianness(intPart); fractPart = SwapEndianness(fractPart); var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L); //**UTC** time var networkDateTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds((long)milliseconds); return networkDateTime; } } }