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