85 lines
2.8 KiB
C#
85 lines
2.8 KiB
C#
using System;
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using System.Net;
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using System.Net.Sockets;
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using System.Diagnostics;
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namespace Aurora.Utils
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{
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public class Time
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{
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public Time(DateTime dateTime, TimeSpan elapsed)
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{
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this.DateTime = dateTime;
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this.Elapsed = elapsed;
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}
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public DateTime DateTime { get; private set; }
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public TimeSpan Elapsed { get; private set; }
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}
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public static class TimeUtils
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{
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public static Time GetNetworkTime()
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{
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Stopwatch stopwatch = new Stopwatch();
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//default Windows time server
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const string ntpServer = "time.windows.com";
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// NTP message size - 16 bytes of the digest (RFC 2030)
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var ntpData = new byte[48];
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//Setting the Leap Indicator, Version Number and Mode values
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ntpData[0] = 0x1B; //LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)
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var addresses = Dns.GetHostEntry(ntpServer).AddressList;
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//The UDP port number assigned to NTP is 123
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var ipEndPoint = new IPEndPoint(addresses[0], 123);
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//NTP uses UDP
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using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
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{
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socket.Connect(ipEndPoint);
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//Stops code hang if NTP is blocked
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socket.ReceiveTimeout = 3000;
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stopwatch.Start();
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socket.Send(ntpData);
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stopwatch.Stop();
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socket.Receive(ntpData);
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socket.Close();
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}
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//Offset to get to the "Transmit Timestamp" field (time at which the reply
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//departed the server for the client, in 64-bit timestamp format."
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byte serverReplyTime = 40;
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//Get the seconds part
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ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime);
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//Get the seconds fraction
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ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4);
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//Convert From big-endian to little-endian
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intPart = SwapEndianness(intPart);
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fractPart = SwapEndianness(fractPart);
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var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L);
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//**UTC** time
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var networkDateTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds((long)milliseconds);
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stopwatch.Stop();
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return new Time(networkDateTime.ToLocalTime(), stopwatch.Elapsed); ;
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}
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// stackoverflow.com/a/3294698/162671
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static uint SwapEndianness(ulong x)
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{
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return (uint)(((x & 0x000000ff) << 24) +
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((x & 0x0000ff00) << 8) +
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((x & 0x00ff0000) >> 8) +
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((x & 0xff000000) >> 24));
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}
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}
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} |