mirror of
https://github.com/moparisthebest/Simba
synced 2024-12-25 08:48:51 -05:00
375 lines
12 KiB
ObjectPascal
375 lines
12 KiB
ObjectPascal
{==============================================================================|
|
|
| Project : Ararat Synapse | 003.000.003 |
|
|
|==============================================================================|
|
|
| Content: SNTP client |
|
|
|==============================================================================|
|
|
| Copyright (c)1999-2010, Lukas Gebauer |
|
|
| All rights reserved. |
|
|
| |
|
|
| Redistribution and use in source and binary forms, with or without |
|
|
| modification, are permitted provided that the following conditions are met: |
|
|
| |
|
|
| Redistributions of source code must retain the above copyright notice, this |
|
|
| list of conditions and the following disclaimer. |
|
|
| |
|
|
| Redistributions in binary form must reproduce the above copyright notice, |
|
|
| this list of conditions and the following disclaimer in the documentation |
|
|
| and/or other materials provided with the distribution. |
|
|
| |
|
|
| Neither the name of Lukas Gebauer nor the names of its contributors may |
|
|
| be used to endorse or promote products derived from this software without |
|
|
| specific prior written permission. |
|
|
| |
|
|
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
|
|
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|
|
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|
|
| ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR |
|
|
| ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
|
|
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
|
|
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
|
|
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|
|
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
|
|
| OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
|
|
| DAMAGE. |
|
|
|==============================================================================|
|
|
| The Initial Developer of the Original Code is Lukas Gebauer (Czech Republic).|
|
|
| Portions created by Lukas Gebauer are Copyright (c)2000-2010. |
|
|
| All Rights Reserved. |
|
|
|==============================================================================|
|
|
| Contributor(s): |
|
|
| Patrick Chevalley |
|
|
|==============================================================================|
|
|
| History: see HISTORY.HTM from distribution package |
|
|
| (Found at URL: http://www.ararat.cz/synapse/) |
|
|
|==============================================================================}
|
|
|
|
{:@abstract( NTP and SNTP client)
|
|
|
|
Used RFC: RFC-1305, RFC-2030
|
|
}
|
|
|
|
{$IFDEF FPC}
|
|
{$MODE DELPHI}
|
|
{$ENDIF}
|
|
{$Q-}
|
|
{$H+}
|
|
|
|
unit sntpsend;
|
|
|
|
interface
|
|
|
|
uses
|
|
SysUtils,
|
|
synsock, blcksock, synautil;
|
|
|
|
const
|
|
cNtpProtocol = '123';
|
|
|
|
type
|
|
|
|
{:@abstract(Record containing the NTP packet.)}
|
|
TNtp = packed record
|
|
mode: Byte;
|
|
stratum: Byte;
|
|
poll: Byte;
|
|
Precision: Byte;
|
|
RootDelay: Longint;
|
|
RootDisperson: Longint;
|
|
RefID: Longint;
|
|
Ref1: Longint;
|
|
Ref2: Longint;
|
|
Org1: Longint;
|
|
Org2: Longint;
|
|
Rcv1: Longint;
|
|
Rcv2: Longint;
|
|
Xmit1: Longint;
|
|
Xmit2: Longint;
|
|
end;
|
|
|
|
{:@abstract(Implementation of NTP and SNTP client protocol),
|
|
include time synchronisation. It can send NTP or SNTP time queries, or it
|
|
can receive NTP broadcasts too.
|
|
|
|
Note: Are you missing properties for specify server address and port? Look to
|
|
parent @link(TSynaClient) too!}
|
|
TSNTPSend = class(TSynaClient)
|
|
private
|
|
FNTPReply: TNtp;
|
|
FNTPTime: TDateTime;
|
|
FNTPOffset: double;
|
|
FNTPDelay: double;
|
|
FMaxSyncDiff: double;
|
|
FSyncTime: Boolean;
|
|
FSock: TUDPBlockSocket;
|
|
FBuffer: AnsiString;
|
|
FLi, FVn, Fmode : byte;
|
|
function StrToNTP(const Value: AnsiString): TNtp;
|
|
function NTPtoStr(const Value: Tntp): AnsiString;
|
|
procedure ClearNTP(var Value: Tntp);
|
|
public
|
|
constructor Create;
|
|
destructor Destroy; override;
|
|
|
|
{:Decode 128 bit timestamp used in NTP packet to TDateTime type.}
|
|
function DecodeTs(Nsec, Nfrac: Longint): TDateTime;
|
|
|
|
{:Decode TDateTime type to 128 bit timestamp used in NTP packet.}
|
|
procedure EncodeTs(dt: TDateTime; var Nsec, Nfrac: Longint);
|
|
|
|
{:Send request to @link(TSynaClient.TargetHost) and wait for reply. If all
|
|
is OK, then result is @true and @link(NTPReply) and @link(NTPTime) are
|
|
valid.}
|
|
function GetSNTP: Boolean;
|
|
|
|
{:Send request to @link(TSynaClient.TargetHost) and wait for reply. If all
|
|
is OK, then result is @true and @link(NTPReply) and @link(NTPTime) are
|
|
valid. Result time is after all needed corrections.}
|
|
function GetNTP: Boolean;
|
|
|
|
{:Wait for broadcast NTP packet. If all OK, result is @true and
|
|
@link(NTPReply) and @link(NTPTime) are valid.}
|
|
function GetBroadcastNTP: Boolean;
|
|
|
|
{:Holds last received NTP packet.}
|
|
property NTPReply: TNtp read FNTPReply;
|
|
published
|
|
{:Date and time of remote NTP or SNTP server. (UTC time!!!)}
|
|
property NTPTime: TDateTime read FNTPTime;
|
|
|
|
{:Offset between your computer and remote NTP or SNTP server.}
|
|
property NTPOffset: Double read FNTPOffset;
|
|
|
|
{:Delay between your computer and remote NTP or SNTP server.}
|
|
property NTPDelay: Double read FNTPDelay;
|
|
|
|
{:Define allowed maximum difference between your time and remote time for
|
|
synchronising time. If difference is bigger, your system time is not
|
|
changed!}
|
|
property MaxSyncDiff: double read FMaxSyncDiff write FMaxSyncDiff;
|
|
|
|
{:If @true, after successfull getting time is local computer clock
|
|
synchronised to given time.
|
|
For synchronising time you must have proper rights! (Usually Administrator)}
|
|
property SyncTime: Boolean read FSyncTime write FSyncTime;
|
|
|
|
{:Socket object used for TCP/IP operation. Good for seting OnStatus hook, etc.}
|
|
property Sock: TUDPBlockSocket read FSock;
|
|
end;
|
|
|
|
implementation
|
|
|
|
constructor TSNTPSend.Create;
|
|
begin
|
|
inherited Create;
|
|
FSock := TUDPBlockSocket.Create;
|
|
FSock.Owner := self;
|
|
FTimeout := 5000;
|
|
FTargetPort := cNtpProtocol;
|
|
FMaxSyncDiff := 3600;
|
|
FSyncTime := False;
|
|
end;
|
|
|
|
destructor TSNTPSend.Destroy;
|
|
begin
|
|
FSock.Free;
|
|
inherited Destroy;
|
|
end;
|
|
|
|
function TSNTPSend.StrToNTP(const Value: AnsiString): TNtp;
|
|
begin
|
|
if length(FBuffer) >= SizeOf(Result) then
|
|
begin
|
|
Result.mode := ord(Value[1]);
|
|
Result.stratum := ord(Value[2]);
|
|
Result.poll := ord(Value[3]);
|
|
Result.Precision := ord(Value[4]);
|
|
Result.RootDelay := DecodeLongInt(value, 5);
|
|
Result.RootDisperson := DecodeLongInt(value, 9);
|
|
Result.RefID := DecodeLongInt(value, 13);
|
|
Result.Ref1 := DecodeLongInt(value, 17);
|
|
Result.Ref2 := DecodeLongInt(value, 21);
|
|
Result.Org1 := DecodeLongInt(value, 25);
|
|
Result.Org2 := DecodeLongInt(value, 29);
|
|
Result.Rcv1 := DecodeLongInt(value, 33);
|
|
Result.Rcv2 := DecodeLongInt(value, 37);
|
|
Result.Xmit1 := DecodeLongInt(value, 41);
|
|
Result.Xmit2 := DecodeLongInt(value, 45);
|
|
end;
|
|
|
|
end;
|
|
|
|
function TSNTPSend.NTPtoStr(const Value: Tntp): AnsiString;
|
|
begin
|
|
SetLength(Result, 4);
|
|
Result[1] := AnsiChar(Value.mode);
|
|
Result[2] := AnsiChar(Value.stratum);
|
|
Result[3] := AnsiChar(Value.poll);
|
|
Result[4] := AnsiChar(Value.precision);
|
|
Result := Result + CodeLongInt(Value.RootDelay);
|
|
Result := Result + CodeLongInt(Value.RootDisperson);
|
|
Result := Result + CodeLongInt(Value.RefID);
|
|
Result := Result + CodeLongInt(Value.Ref1);
|
|
Result := Result + CodeLongInt(Value.Ref2);
|
|
Result := Result + CodeLongInt(Value.Org1);
|
|
Result := Result + CodeLongInt(Value.Org2);
|
|
Result := Result + CodeLongInt(Value.Rcv1);
|
|
Result := Result + CodeLongInt(Value.Rcv2);
|
|
Result := Result + CodeLongInt(Value.Xmit1);
|
|
Result := Result + CodeLongInt(Value.Xmit2);
|
|
end;
|
|
|
|
procedure TSNTPSend.ClearNTP(var Value: Tntp);
|
|
begin
|
|
Value.mode := 0;
|
|
Value.stratum := 0;
|
|
Value.poll := 0;
|
|
Value.Precision := 0;
|
|
Value.RootDelay := 0;
|
|
Value.RootDisperson := 0;
|
|
Value.RefID := 0;
|
|
Value.Ref1 := 0;
|
|
Value.Ref2 := 0;
|
|
Value.Org1 := 0;
|
|
Value.Org2 := 0;
|
|
Value.Rcv1 := 0;
|
|
Value.Rcv2 := 0;
|
|
Value.Xmit1 := 0;
|
|
Value.Xmit2 := 0;
|
|
end;
|
|
|
|
function TSNTPSend.DecodeTs(Nsec, Nfrac: Longint): TDateTime;
|
|
const
|
|
maxi = 4294967295.0;
|
|
var
|
|
d, d1: Double;
|
|
begin
|
|
d := Nsec;
|
|
if d < 0 then
|
|
d := maxi + d + 1;
|
|
d1 := Nfrac;
|
|
if d1 < 0 then
|
|
d1 := maxi + d1 + 1;
|
|
d1 := d1 / maxi;
|
|
d1 := Trunc(d1 * 10000) / 10000;
|
|
Result := (d + d1) / 86400;
|
|
Result := Result + 2;
|
|
end;
|
|
|
|
procedure TSNTPSend.EncodeTs(dt: TDateTime; var Nsec, Nfrac: Longint);
|
|
const
|
|
maxi = 4294967295.0;
|
|
maxilongint = 2147483647;
|
|
var
|
|
d, d1: Double;
|
|
begin
|
|
d := (dt - 2) * 86400;
|
|
d1 := frac(d);
|
|
if d > maxilongint then
|
|
d := d - maxi - 1;
|
|
d := trunc(d);
|
|
d1 := Trunc(d1 * 10000) / 10000;
|
|
d1 := d1 * maxi;
|
|
if d1 > maxilongint then
|
|
d1 := d1 - maxi - 1;
|
|
Nsec:=trunc(d);
|
|
Nfrac:=trunc(d1);
|
|
end;
|
|
|
|
function TSNTPSend.GetBroadcastNTP: Boolean;
|
|
var
|
|
x: Integer;
|
|
begin
|
|
Result := False;
|
|
FSock.Bind(FIPInterface, FTargetPort);
|
|
FBuffer := FSock.RecvPacket(FTimeout);
|
|
if FSock.LastError = 0 then
|
|
begin
|
|
x := Length(FBuffer);
|
|
if (FTargetHost = '0.0.0.0') or (FSock.GetRemoteSinIP = FSock.ResolveName(FTargetHost)) then
|
|
if x >= SizeOf(NTPReply) then
|
|
begin
|
|
FNTPReply := StrToNTP(FBuffer);
|
|
FNTPTime := DecodeTs(NTPReply.Xmit1, NTPReply.Xmit2);
|
|
if FSyncTime and ((abs(FNTPTime - GetUTTime) * 86400) <= FMaxSyncDiff) then
|
|
SetUTTime(FNTPTime);
|
|
Result := True;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
function TSNTPSend.GetSNTP: Boolean;
|
|
var
|
|
q: TNtp;
|
|
x: Integer;
|
|
begin
|
|
Result := False;
|
|
FSock.CloseSocket;
|
|
FSock.Bind(FIPInterface, cAnyPort);
|
|
FSock.Connect(FTargetHost, FTargetPort);
|
|
ClearNtp(q);
|
|
q.mode := $1B;
|
|
FBuffer := NTPtoStr(q);
|
|
FSock.SendString(FBuffer);
|
|
FBuffer := FSock.RecvPacket(FTimeout);
|
|
if FSock.LastError = 0 then
|
|
begin
|
|
x := Length(FBuffer);
|
|
if x >= SizeOf(NTPReply) then
|
|
begin
|
|
FNTPReply := StrToNTP(FBuffer);
|
|
FNTPTime := DecodeTs(NTPReply.Xmit1, NTPReply.Xmit2);
|
|
if FSyncTime and ((abs(FNTPTime - GetUTTime) * 86400) <= FMaxSyncDiff) then
|
|
SetUTTime(FNTPTime);
|
|
Result := True;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
function TSNTPSend.GetNTP: Boolean;
|
|
var
|
|
q: TNtp;
|
|
x: Integer;
|
|
t1, t2, t3, t4 : TDateTime;
|
|
begin
|
|
Result := False;
|
|
FSock.CloseSocket;
|
|
FSock.Bind(FIPInterface, cAnyPort);
|
|
FSock.Connect(FTargetHost, FTargetPort);
|
|
ClearNtp(q);
|
|
q.mode := $1B;
|
|
t1 := GetUTTime;
|
|
EncodeTs(t1, q.org1, q.org2);
|
|
FBuffer := NTPtoStr(q);
|
|
FSock.SendString(FBuffer);
|
|
FBuffer := FSock.RecvPacket(FTimeout);
|
|
if FSock.LastError = 0 then
|
|
begin
|
|
x := Length(FBuffer);
|
|
t4 := GetUTTime;
|
|
if x >= SizeOf(NTPReply) then
|
|
begin
|
|
FNTPReply := StrToNTP(FBuffer);
|
|
FLi := (NTPReply.mode and $C0) shr 6;
|
|
FVn := (NTPReply.mode and $38) shr 3;
|
|
Fmode := NTPReply.mode and $07;
|
|
if (Fli < 3) and (Fmode = 4) and
|
|
(NTPReply.stratum >= 1) and (NTPReply.stratum <= 15) and
|
|
(NTPReply.Rcv1 <> 0) and (NTPReply.Xmit1 <> 0)
|
|
then begin
|
|
t2 := DecodeTs(NTPReply.Rcv1, NTPReply.Rcv2);
|
|
t3 := DecodeTs(NTPReply.Xmit1, NTPReply.Xmit2);
|
|
FNTPDelay := (T4 - T1) - (T2 - T3);
|
|
FNTPTime := t3 + FNTPDelay / 2;
|
|
FNTPOffset := (((T2 - T1) + (T3 - T4)) / 2) * 86400;
|
|
FNTPDelay := FNTPDelay * 86400;
|
|
if FSyncTime and ((abs(FNTPTime - t1) * 86400) <= FMaxSyncDiff) then
|
|
SetUTTime(FNTPTime);
|
|
Result := True;
|
|
end
|
|
else result:=false;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
end.
|