492 lines
16 KiB
Plaintext
492 lines
16 KiB
Plaintext
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{
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$Project$
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$Workfile$
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$Revision$
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$DateUTC$
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$Id$
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This file is part of the Indy (Internet Direct) project, and is offered
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under the dual-licensing agreement described on the Indy website.
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(http://www.indyproject.org/)
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Copyright:
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(c) 1993-2005, Chad Z. Hower and the Indy Pit Crew. All rights reserved.
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}
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{
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$Log$
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}
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{
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Rev 1.7 2/8/05 6:08:04 PM RLebeau
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Changed CheckOptionAck() to use TextIsSame() instead of SameText()
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Rev 1.6 7/23/04 6:41:50 PM RLebeau
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TFileStream access right tweak for Put()
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Rev 1.5 2/7/2004 7:25:58 PM JPMugaas
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Deleted error msg code in error packet. OOPS!!!
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Rev 1.4 2/7/2004 7:20:16 PM JPMugaas
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DotNET to go!! and YES - I want fries with that :-).
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Rev 1.3 2004.02.03 5:44:38 PM czhower
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Name changes
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Rev 1.2 1/21/2004 4:21:04 PM JPMugaas
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InitComponent
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Rev 1.1 2003.10.12 6:36:46 PM czhower
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Now compiles.
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Rev 1.0 11/13/2002 08:03:32 AM JPMugaas
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}
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unit IdTrivialFTP;
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interface
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{$i IdCompilerDefines.inc}
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uses
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Classes,
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IdAssignedNumbers,
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IdGlobal,
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IdTrivialFTPBase,
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IdUDPClient;
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const
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GTransferMode = tfOctet;
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GFRequestedBlockSize = 1500;
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GReceiveTimeout = 4000;
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type
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TIdTrivialFTP = class(TIdUDPClient)
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protected
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FMode: TIdTFTPMode;
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FRequestedBlockSize: Integer;
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FPeerPort: TIdPort;
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FPeerIP: String;
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function ModeToStr: string;
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procedure CheckOptionAck(const OptionPacket: TIdBytes; Reading: Boolean);
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protected
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procedure SendAck(const BlockNumber: UInt16);
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procedure RaiseError(const ErrorPacket: TIdBytes);
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procedure InitComponent; override;
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public
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procedure Get(const ServerFile: String; DestinationStream: TStream); overload;
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procedure Get(const ServerFile, LocalFile: String); overload;
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procedure Put(SourceStream: TStream; const ServerFile: String); overload;
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procedure Put(const LocalFile, ServerFile: String); overload;
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published
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property TransferMode: TIdTFTPMode read FMode write FMode Default GTransferMode;
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property RequestedBlockSize: Integer read FRequestedBlockSize write FRequestedBlockSize default 1500;
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property OnWork;
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property OnWorkBegin;
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property OnWorkEnd;
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end;
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implementation
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uses
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{$IFDEF DOTNET}
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IdStreamNET,
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{$ELSE}
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IdStreamVCL,
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{$ENDIF}
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IdComponent,
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IdExceptionCore,
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IdGlobalProtocols,
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IdResourceStringsProtocols,
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IdStack,
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SysUtils;
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procedure TIdTrivialFTP.CheckOptionAck(const OptionPacket: TIdBytes; Reading: Boolean);
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var
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LOptName, LOptValue: String;
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LOffset, Idx, OptionIdx: Integer;
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LRequestedBlkSize: Integer;
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begin
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LOffset := 2; // skip packet opcode
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try
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while LOffset < Length(OptionPacket) do
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begin
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Idx := ByteIndex(0, OptionPacket, LOffset);
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if Idx = -1 then begin
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raise EIdTFTPOptionNegotiationFailed.Create('');
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end;
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LOptName := BytesToString(OptionPacket, LOffset, Idx-LOffset, IndyTextEncoding_ASCII);
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LOffset := Idx+1;
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Idx := ByteIndex(0, OptionPacket, LOffset);
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if Idx = -1 then begin
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raise EIdTFTPOptionNegotiationFailed.Create('');
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end;
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LOptValue := BytesToString(OptionPacket, LOffset, Idx-LOffset, IndyTextEncoding_ASCII);
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LOffset := Idx+1;
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OptionIdx := PosInStrArray(LOptName, [sBlockSize, sTransferSize], False);
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if OptionIdx = -1 then begin
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// RLebeau 12/6/2011: workaround for bug in PicoMOD3 devices
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if (LOptName = '') and (LOptValue = '') then begin
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Continue;
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end;
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raise EIdTFTPOptionNegotiationFailed.CreateFmt(RSTFTPUnsupportedOption, [LOptName]);
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end;
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case OptionIdx of
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0:
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begin
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LRequestedBlkSize := IndyStrToInt(LOptValue);
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if (LRequestedBlkSize < 8) or (LRequestedBlkSize > 65464) then begin
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raise EIdTFTPOptionNegotiationFailed.CreateFmt(RSTFTPUnsupportedOptionValue, [LOptValue, LOptName]);
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end;
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BufferSize := 4 + LRequestedBlkSize;
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end;
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1:
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begin
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if Reading then
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begin
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// TODO
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{
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if (IndyStrToInt(LOptValue) is not available) then begin
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raise EIdTFTPAllocationExceeded.Create('');
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end;
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}
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end;
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end;
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end;
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end;
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except
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on E: Exception do begin
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SendError(Self, FPeerIP, FPeerPort, E);
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raise;
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end;
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end;
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end;
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procedure TIdTrivialFTP.InitComponent;
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begin
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inherited;
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TransferMode := GTransferMode;
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Port := IdPORT_TFTP;
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FRequestedBlockSize := GFRequestedBlockSize;
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ReceiveTimeout := GReceiveTimeout;
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end;
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procedure TIdTrivialFTP.Get(const ServerFile: String; DestinationStream: TStream);
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var
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Buffer, LServerFile, LMode, LBlockSize, LBlockOctets, LTransferSize, LTransferOctets: TIdBytes;
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DataLen, LOffset: Integer;
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ExpectedBlockCtr, RecvdBlockCtr: UInt16;
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TerminateTransfer: Boolean;
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begin
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try
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BufferSize := 4 + 512; // 512 as specified by RFC 1350
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LServerFile := ToBytes(ServerFile);
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LMode := ToBytes(ModeToStr);
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LBlockSize := ToBytes(sBlockSize);
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LBlockOctets := ToBytes(IntToStr(FRequestedBlockSize));
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LTransferSize := ToBytes(sTransferSize);
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LTransferOctets := ToBytes(IntToStr(0));
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SetLength(Buffer, 2+Length(LServerFile)+1+Length(LMode)+1+Length(LBlockSize)+1+Length(LBlockOctets)+1+Length(LTransferSize)+1+Length(LTransferOctets)+1);
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LOffset := 0;
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CopyTIdUInt16(GStack.HostToNetwork(UInt16(TFTP_RRQ)), Buffer, LOffset);
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Inc(LOffset, 2);
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CopyTIdBytes(LServerFile, 0, Buffer, LOffset, Length(LServerFile));
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Inc(LOffset, Length(LServerFile));
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Buffer[LOffset] := 0;
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Inc(LOffset);
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CopyTIdBytes(LMode, 0, Buffer, LOffset, Length(LMode));
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Inc(LOffset, Length(LMode));
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Buffer[LOffset] := 0;
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Inc(LOffset);
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CopyTIdBytes(LBlockSize, 0, Buffer, LOffset, Length(LBlockSize));
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Inc(LOffset, Length(LBlockSize));
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Buffer[LOffset] := 0;
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Inc(LOffset);
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CopyTIdBytes(LBlockOctets, 0, Buffer, LOffset, Length(LBlockOctets));
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Inc(LOffset, Length(LBlockOctets));
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Buffer[LOffset] := 0;
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Inc(LOffset);
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CopyTIdBytes(LTransferSize, 0, Buffer, LOffset, Length(LTransferSize));
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Inc(LOffset, Length(LTransferSize));
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Buffer[LOffset] := 0;
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Inc(LOffset);
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CopyTIdBytes(LTransferOctets, 0, Buffer, LOffset, Length(LTransferOctets));
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Inc(LOffset, Length(LTransferOctets));
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Buffer[LOffset] := 0;
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SendBuffer(Buffer);
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ExpectedBlockCtr := 1;
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TerminateTransfer := False;
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BeginWork(wmRead);
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try
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repeat
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SetLength(Buffer, BufferSize);
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DataLen := ReceiveBuffer(Buffer, FPeerIP, FPeerPort, ReceiveTimeout);
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if DataLen <= 0 then begin
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// TODO: re-transmit the last sent packet again instead of erroring...
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raise EIdTFTPException.Create(RSTimeOut);
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end;
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SetLength(Buffer, DataLen);
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// TODO: validate the correct peer is sending the data...
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case GStack.NetworkToHost(BytesToUInt16(Buffer)) of
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TFTP_DATA:
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begin
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RecvdBlockCtr := GStack.NetworkToHost(BytesToUInt16(Buffer, 2));
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if RecvdBlockCtr = ExpectedBlockCtr then
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begin
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DataLen := Length(Buffer) - 4;
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try
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WriteTIdBytesToStream(DestinationStream, Buffer, DataLen, 4);
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DoWork(wmRead, DataLen);
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except
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on E: Exception do
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begin
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SendError(Self, FPeerIP, FPeerPort, E);
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raise;
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end;
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end;
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SendAck(RecvdBlockCtr);
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if RecvdBlockCtr = High(UInt16) then begin
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if Length(Buffer) >= BufferSize then begin
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// have reached the max block counter allowed, can't validate any more data...
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SendError(Self, FPeerIP, FPeerPort, ErrIllegalOperation, '');
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raise EIdTFTPException.CreateFmt(RSTFTPUnexpectedOp, [FPeerIP, FPeerPort]);
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end;
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TerminateTransfer := True; // end of transfer, a block counter cannot wrap back to 0
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end else begin
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ExpectedBlockCtr := RecvdBlockCtr + 1;
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TerminateTransfer := Length(Buffer) < BufferSize;
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end;
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end;
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end;
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TFTP_ERROR:
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begin
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RaiseError(Buffer);
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end;
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TFTP_OACK:
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begin
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CheckOptionAck(Buffer, True);
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SendAck(0);
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end;
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else
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begin
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SendError(Self, FPeerIP, FPeerPort, ErrIllegalOperation, '');
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raise EIdTFTPException.CreateFmt(RSTFTPUnexpectedOp, [FPeerIP, FPeerPort]);
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end;
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end;
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until TerminateTransfer;
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finally
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EndWork(wmRead);
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end;
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finally
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Binding.CloseSocket;
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end;
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end;
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procedure TIdTrivialFTP.Get(const ServerFile, LocalFile: String);
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var
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fs: TFileStream;
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begin
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fs := TIdFileCreateStream.Create(LocalFile);
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try
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Get(ServerFile, fs);
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finally
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FreeAndNil(fs);
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end;
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end;
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function TIdTrivialFTP.ModeToStr: string;
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begin
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case TransferMode of
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tfNetAscii: Result := 'netascii'; {Do not Localize}
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tfOctet: Result := 'octet'; {Do not Localize}
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end;
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end;
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procedure TIdTrivialFTP.Put(SourceStream: TStream; const ServerFile: String);
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var
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Buffer, LServerFile, LMode, LBlockSize, LBlockOctets, LTransferSize, LTransferOctets: TIdBytes;
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StreamLen: TIdStreamSize;
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LOffset, DataLen: Integer;
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ExpectedBlockCtr, RecvdBlockCtr, wOp: UInt16;
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TerminateTransfer, WaitingForAck: Boolean;
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procedure SendDataPacket(const BlockNumber: UInt16);
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begin
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DataLen := IndyMin(BufferSize-4, StreamLen);
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SetLength(Buffer, 4 + DataLen);
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CopyTIdUInt16(GStack.HostToNetwork(UInt16(TFTP_DATA)), Buffer, 0);
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CopyTIdUInt16(GStack.HostToNetwork(BlockNumber), Buffer, 2);
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try
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DataLen := ReadTIdBytesFromStream(SourceStream, Buffer, DataLen, 4);
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except
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on E: Exception do
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begin
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SendError(Self, FPeerIP, FPeerPort, E);
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raise;
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end;
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end;
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SetLength(Buffer, 4 + DataLen);
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SendBuffer(FPeerIP, FPeerPort, Buffer);
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WaitingForAck := True;
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DoWork(wmWrite, DataLen);
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Dec(StreamLen, DataLen);
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TerminateTransfer := DataLen < (BufferSize - 4);
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ExpectedBlockCtr := BlockNumber;
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end;
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begin
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try
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BufferSize := 4 + 512; // 512 as specified by RFC 1350
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StreamLen := SourceStream.Size - SourceStream.Position;
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LServerFile := ToBytes(ServerFile);
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LMode := ToBytes(ModeToStr);
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LBlockSize := ToBytes(sBlockSize);
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LBlockOctets := ToBytes(IntToStr(FRequestedBlockSize));
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LTransferSize := ToBytes(sTransferSize);
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LTransferOctets := ToBytes(IntToStr(StreamLen));
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SetLength(Buffer, 2+Length(LServerFile)+1+Length(LMode)+1+Length(LBlockSize)+1+Length(LBlockOctets)+1+Length(LTransferSize)+1+Length(LTransferOctets)+1);
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LOffset := 0;
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CopyTIdUInt16(GStack.HostToNetwork(UInt16(TFTP_WRQ)), Buffer, LOffset);
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Inc(LOffset, 2);
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CopyTIdBytes(LServerFile, 0, Buffer, LOffset, Length(LServerFile));
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Inc(LOffset, Length(LServerFile));
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Buffer[LOffset] := 0;
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Inc(LOffset);
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CopyTIdBytes(LMode, 0, Buffer, LOffset, Length(LMode));
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Inc(LOffset, Length(LMode));
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Buffer[LOffset] := 0;
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Inc(LOffset);
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|
|
CopyTIdBytes(LBlockSize, 0, Buffer, LOffset, Length(LBlockSize));
|
||
|
|
Inc(LOffset, Length(LBlockSize));
|
||
|
|
Buffer[LOffset] := 0;
|
||
|
|
Inc(LOffset);
|
||
|
|
CopyTIdBytes(LBlockOctets, 0, Buffer, LOffset, Length(LBlockOctets));
|
||
|
|
Inc(LOffset, Length(LBlockOctets));
|
||
|
|
Buffer[LOffset] := 0;
|
||
|
|
Inc(LOffset);
|
||
|
|
CopyTIdBytes(LTransferSize, 0, Buffer, LOffset, Length(LTransferSize));
|
||
|
|
Inc(LOffset, Length(LTransferSize));
|
||
|
|
Buffer[LOffset] := 0;
|
||
|
|
Inc(LOffset);
|
||
|
|
CopyTIdBytes(LTransferOctets, 0, Buffer, LOffset, Length(LTransferOctets));
|
||
|
|
Inc(LOffset, Length(LTransferOctets));
|
||
|
|
Buffer[LOffset] := 0;
|
||
|
|
|
||
|
|
SendBuffer(Buffer);
|
||
|
|
|
||
|
|
ExpectedBlockCtr := 0;
|
||
|
|
TerminateTransfer := False;
|
||
|
|
|
||
|
|
BeginWork(wmWrite, StreamLen);
|
||
|
|
try
|
||
|
|
repeat
|
||
|
|
SetLength(Buffer, BufferSize);
|
||
|
|
DataLen := ReceiveBuffer(Buffer, FPeerIP, FPeerPort, IndyMax(500, ReceiveTimeout));
|
||
|
|
if DataLen <= 0 then begin
|
||
|
|
// TODO: re-transmit the last sent packet again instead of erroring...
|
||
|
|
raise EIdTFTPException.Create(RSTimeOut);
|
||
|
|
end;
|
||
|
|
SetLength(Buffer, DataLen);
|
||
|
|
// TODO: validate the correct peer is sending the data...
|
||
|
|
wOp := GStack.NetworkToHost(BytesToUInt16(Buffer));
|
||
|
|
case wOp of
|
||
|
|
TFTP_ACK:
|
||
|
|
begin
|
||
|
|
RecvdBlockCtr := GStack.NetworkToHost(BytesToUInt16(Buffer, 2));
|
||
|
|
if RecvdBlockCtr = ExpectedBlockCtr then
|
||
|
|
begin
|
||
|
|
WaitingForAck := False;
|
||
|
|
if not TerminateTransfer then
|
||
|
|
begin
|
||
|
|
if RecvdBlockCtr = High(UInt16) then
|
||
|
|
begin
|
||
|
|
// end of transfer, a block counter cannot wrap back to 0
|
||
|
|
SendError(Self, FPeerIP, FPeerPort, ErrAllocationExceeded, '');
|
||
|
|
raise EIdTFTPAllocationExceeded.Create('');
|
||
|
|
end;
|
||
|
|
SendDataPacket(RecvdBlockCtr+1);
|
||
|
|
end;
|
||
|
|
end;
|
||
|
|
end;
|
||
|
|
TFTP_OACK:
|
||
|
|
begin
|
||
|
|
if ExpectedBlockCtr <> 0 then
|
||
|
|
begin
|
||
|
|
SendError(Self, FPeerIP, FPeerPort, ErrIllegalOperation, '');
|
||
|
|
raise EIdTFTPException.CreateFmt(RSTFTPUnexpectedOp, [FPeerIP, FPeerPort]);
|
||
|
|
end;
|
||
|
|
CheckOptionAck(Buffer, False);
|
||
|
|
SendDataPacket(1);
|
||
|
|
end;
|
||
|
|
TFTP_ERROR:
|
||
|
|
begin
|
||
|
|
RaiseError(Buffer);
|
||
|
|
end;
|
||
|
|
else
|
||
|
|
begin
|
||
|
|
SendError(Self, FPeerIP, FPeerPort, ErrIllegalOperation, '');
|
||
|
|
raise EIdTFTPException.CreateFmt(RSTFTPUnexpectedOp, [FPeerIP, FPeerPort]);
|
||
|
|
end;
|
||
|
|
end;
|
||
|
|
until TerminateTransfer and (not WaitingForAck);
|
||
|
|
finally
|
||
|
|
EndWork(wmWrite);
|
||
|
|
end;
|
||
|
|
finally
|
||
|
|
Binding.CloseSocket;
|
||
|
|
end;
|
||
|
|
end;
|
||
|
|
|
||
|
|
procedure TIdTrivialFTP.Put(const LocalFile, ServerFile: String);
|
||
|
|
var
|
||
|
|
fs: TIdReadFileExclusiveStream;
|
||
|
|
begin
|
||
|
|
fs := TIdReadFileExclusiveStream.Create(LocalFile);
|
||
|
|
try
|
||
|
|
Put(fs, ServerFile);
|
||
|
|
finally
|
||
|
|
fs.Free;
|
||
|
|
end;
|
||
|
|
end;
|
||
|
|
|
||
|
|
procedure TIdTrivialFTP.RaiseError(const ErrorPacket: TIdBytes);
|
||
|
|
var
|
||
|
|
ErrMsg: string;
|
||
|
|
begin
|
||
|
|
ErrMsg := BytesToString(ErrorPacket, 4, Length(ErrorPacket)-4, IndyTextEncoding_ASCII);
|
||
|
|
case GStack.NetworkToHost(BytesToUInt16(ErrorPacket, 2)) of
|
||
|
|
ErrFileNotFound: raise EIdTFTPFileNotFound.Create(ErrMsg);
|
||
|
|
ErrAccessViolation: raise EIdTFTPAccessViolation.Create(ErrMsg);
|
||
|
|
ErrAllocationExceeded: raise EIdTFTPAllocationExceeded.Create(ErrMsg);
|
||
|
|
ErrIllegalOperation: raise EIdTFTPIllegalOperation.Create(ErrMsg);
|
||
|
|
ErrUnknownTransferID: raise EIdTFTPUnknownTransferID.Create(ErrMsg);
|
||
|
|
ErrFileAlreadyExists: raise EIdTFTPFileAlreadyExists.Create(ErrMsg);
|
||
|
|
ErrNoSuchUser: raise EIdTFTPNoSuchUser.Create(ErrMsg);
|
||
|
|
ErrOptionNegotiationFailed: raise EIdTFTPOptionNegotiationFailed.Create(ErrMsg);
|
||
|
|
else
|
||
|
|
// usually ErrUndefined (see EIdTFTPException.Message if any)
|
||
|
|
raise EIdTFTPException.Create(ErrMsg);
|
||
|
|
end;
|
||
|
|
end;
|
||
|
|
|
||
|
|
procedure TIdTrivialFTP.SendAck(const BlockNumber: UInt16);
|
||
|
|
begin
|
||
|
|
SendBuffer(FPeerIP, FPeerPort, MakeActPkt(BlockNumber));
|
||
|
|
end;
|
||
|
|
|
||
|
|
end.
|