public static NtpPacket ReadPacket(UdpClient udpClient, NtpPacket packet)
{
var remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
byte[] data = null;
for (int i = 0; i < 5; i++)
{
data = packet.ToRawByteArray();
udpClient.Send(data, data.Length);
try
{
data = udpClient.Receive(ref remoteEndPoint);
break;
}
catch (SocketException)
{
continue;
}
}
if (data == null)
{
throw new TimeoutException();
}
var resultPacket = NtpPacket.ParseRawByteArray(data);
return resultPacket;
}
public static TimeSpan CalculateRoundTripDelay(NtpPacket resultPacket, DateTime resultTime)
{
return (resultTime - resultPacket.OriginateTimeSpamp) - (resultPacket.ReceiveTimeSpamp - resultPacket.TransmitTimeSpamp);
}
public static NtpPacket ReadPacket(UdpClient udpClient)
{
var packet = new NtpPacket();
packet.VersionNumber = 4;
packet.Mode = NtpMode.Client;
packet.TransmitTimeSpamp = DateTime.Now;
return ReadPacket(udpClient, packet);
}
public static TimeSpan CalculateLocalClockOffset(NtpPacket resultPacket, DateTime resultTime)
{
return TimeSpan.FromTicks(((resultPacket.ReceiveTimeSpamp - resultPacket.OriginateTimeSpamp) + (resultPacket.TransmitTimeSpamp - resultTime)).Ticks / 2);
}
public override void DoRun()
{
SetTaskState(TaskState.Running);
try
{
progress.SetState(1, "Connecting");
System.Threading.Thread.Sleep(1000);
var udpClient = this.CreateUdpClient();
progress.SetState(2, "Connected");
var packet = new NtpPacket();
packet.VersionNumber = 4;
packet.Mode = NtpMode.Client;
packet.TransmitTimeSpamp = DateTime.Now;
var remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
var outdata = packet.ToRawByteArray();
byte[] data = null;
for (int i = 0; i < 5; i++)
{
data = null;
progress.SetState(3, $"Requesting Time (Attempt {i + 1})");
udpClient.Send(outdata, outdata.Length);
try
{
data = udpClient.Receive(ref remoteEndPoint);
break;
}
catch (SocketException)
{
continue;
}
}
var now = DateTime.Now;
if (data == null)
{
throw new TimeoutException();
}
var resultPacket = NtpPacket.ParseRawByteArray(data);
var localOffset = NtpPacket.CalculateLocalClockOffset(resultPacket, now);
value = localOffset;
SetTaskState(TaskState.Finished);
progress.SetState(4, "Finished");
}
finally
{
if (this.TaskState != TaskState.Finished)
{
SetTaskState(TaskState.Stopped);
progress.SetState(4, "Stopped (Error)");
}
}
}
public static TimeSpan CalculateRoundTripDelay(NtpPacket resultPacket, DateTime resultTime)
{
return((resultTime - resultPacket.OriginateTimeSpamp) - (resultPacket.ReceiveTimeSpamp - resultPacket.TransmitTimeSpamp));
}
public static TimeSpan CalculateLocalClockOffset(NtpPacket resultPacket, DateTime resultTime)
{
return(TimeSpan.FromTicks(((resultPacket.ReceiveTimeSpamp - resultPacket.OriginateTimeSpamp) + (resultPacket.TransmitTimeSpamp - resultTime)).Ticks / 2));
}
public override void DoRun()
{
SetTaskState(TaskState.Running);
try
{
progress.SetState(1, "Connecting");
System.Threading.Thread.Sleep(1000);
var udpClient = this.CreateUdpClient();
progress.SetState(2, "Connected");
var packet = new NtpPacket();
packet.VersionNumber = 4;
packet.Mode = NtpMode.Client;
packet.TransmitTimeSpamp = DateTime.Now;
var remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
var outdata = packet.ToRawByteArray();
byte[] data = null;
for (int i = 0; i < 5; i++)
{
data = null;
progress.SetState(3, $"Requesting Time (Attempt {i + 1})");
udpClient.Send(outdata, outdata.Length);
try
{
data = udpClient.Receive(ref remoteEndPoint);
break;
}
catch (SocketException)
{
continue;
}
}
var now = DateTime.Now;
if (data == null)
{
throw new TimeoutException();
}
var resultPacket = NtpPacket.ParseRawByteArray(data);
var localOffset = NtpPacket.CalculateLocalClockOffset(resultPacket, now);
value = localOffset;
SetTaskState(TaskState.Finished);
progress.SetState(4, "Finished");
}
finally
{
if (this.TaskState != TaskState.Finished)
{
SetTaskState(TaskState.Stopped);
progress.SetState(4, "Stopped (Error)");
}
}
}
