UtilClass/Sntp.h

@@ -0,0 +1,107 @@
+/*
+Module : SNTP.H
+Purpose: Interface for a MFC class to encapsulate the SNTP protocol
+Created: PJN / 05-08-1998
+History: PJN / None
+
+
+Copyright (c) 1998 by PJ Naughter.  
+All rights reserved.
+
+
+*/
+
+#ifndef __SNTP_H__
+#define __SNTP_H__
+
+
+
+///////////////////////////////// Classes //////////////////////////////
+
+//Representation of an NTP timestamp
+struct CNtpTimePacket
+{
+  DWORD m_dwInteger;
+	DWORD m_dwFractional;
+};
+
+//Helper class to encapulate NTP time stamps
+class CNtpTime
+{
+public:
+//Constructors / Destructors
+  CNtpTime();
+  CNtpTime(const CNtpTime& time);
+  CNtpTime(CNtpTimePacket& packet);
+  CNtpTime(const SYSTEMTIME& st);
+
+//General functions
+  CNtpTime& operator=(const CNtpTime& time);
+	double operator-(const CNtpTime& time) const;
+	CNtpTime operator+(const double& timespan) const;
+  operator SYSTEMTIME() const;
+  operator CNtpTimePacket() const;
+  operator unsigned __int64() const { return m_Time; };
+  DWORD Seconds() const;
+  DWORD Fraction() const;
+
+//Static functions
+  static CNtpTime GetCurrentTime();
+  static DWORD MsToNtpFraction(WORD wMilliSeconds);
+  static WORD NtpFractionToMs(DWORD dwFraction);
+	static double NtpFractionToSecond(DWORD dwFraction);
+
+protected:
+//Internal static functions and data
+  static long GetJulianDay(WORD Year, WORD Month, WORD Day);
+  static void GetGregorianDate(long JD, WORD& Year, WORD& Month, WORD& Day);
+  static DWORD m_MsToNTP[1000];
+
+//The actual data
+  unsigned __int64 m_Time;
+};
+
+struct NtpServerResponse
+{
+  int m_nLeapIndicator; //0: no warning
+                        //1: last minute in day has 61 seconds
+                        //2: last minute has 59 seconds
+                        //3: clock not synchronized
+
+  int m_nStratum; //0: unspecified or unavailable
+                  //1: primary reference (e.g., radio clock)
+                  //2-15: secondary reference (via NTP or SNTP)
+                  //16-255: reserved
+
+  CNtpTime     m_OriginateTime;    //Time when the request was sent from the client to the SNTP server
+  CNtpTime     m_ReceiveTime;      //Time when the request was received by the server
+  CNtpTime     m_TransmitTime;     //Time when the server sent the request back to the client
+  CNtpTime     m_DestinationTime;  //Time when the reply was received by the client
+  double       m_RoundTripDelay;   //Round trip time in seconds
+  double       m_LocalClockOffset; //Local clock offset relative to the server
+};
+                  
+//The actual SNTP class
+class CSNTPClient : public CObject
+{
+public:
+//Constructors / Destructors
+  CSNTPClient();
+
+//General functions
+  BOOL  GetServerTime(LPCTSTR pszHostName, NtpServerResponse& response, int nPort = 123);
+  DWORD GetTimeout() const { return m_dwTimeout; };
+  void  SetTimeout(DWORD dwTimeout) { m_dwTimeout = dwTimeout; };
+  BOOL  SetClientTime(const CNtpTime& NewTime);
+
+protected:
+  BOOL EnableSetTimePriviledge();
+  void RevertSetTimePriviledge();
+
+  DWORD            m_dwTimeout;
+  HANDLE           m_hToken;
+  TOKEN_PRIVILEGES m_TokenPriv;
+  BOOL             m_bTakenPriviledge;
+};
+
+#endif //__SNTP_H__