Title: FTP Server
Question: IMplement an FTP server using INDY FTP
Answer:
unit FTP;
interface
uses
Classes,
windows,
sysutils,
IdFTPList,
IdFTPServer,
idtcpserver,
IdSocketHandle,
idglobal,
IdHashCRC,
ValLogonW2000,
Registry;
type
TSystemasFTP = (ftpsOther, ftpsDOS, ftpsUNIX, ftpsVAX);
TServidorFTP = class
private
{ Private declarations }
IdFTPServer: tIdFTPServer;
Directorio: String;
procedure IdFTPServer1UserLogin( ASender: TIdFTPServerThread; const AUsername, APassword: string; var AAuthenticated: Boolean ) ;
procedure IdFTPServer1ListDirectory( ASender: TIdFTPServerThread; const APath: string; ADirectoryListing: TIdFTPListItems ) ;
procedure IdFTPServer1RenameFile( ASender: TIdFTPServerThread; const ARenameFromFile, ARenameToFile: string ) ;
procedure IdFTPServer1RetrieveFile( ASender: TIdFTPServerThread; const AFilename: string; var VStream: TStream ) ;
procedure IdFTPServer1StoreFile( ASender: TIdFTPServerThread; const AFilename: string; AAppend: Boolean; var VStream: TStream ) ;
procedure IdFTPServer1RemoveDirectory( ASender: TIdFTPServerThread; var VDirectory: string ) ;
procedure IdFTPServer1MakeDirectory( ASender: TIdFTPServerThread; var VDirectory: string ) ;
procedure IdFTPServer1GetFileSize( ASender: TIdFTPServerThread; const AFilename: string; var VFileSize: Int64 ) ;
procedure IdFTPServer1DeleteFile( ASender: TIdFTPServerThread; const APathname: string ) ;
procedure IdFTPServer1ChangeDirectory( ASender: TIdFTPServerThread; var VDirectory: string ) ;
procedure IdFTPServer1CommandXCRC( ASender: TIdCommand ) ;
procedure IdFTPServer1DisConnect( AThread: TIdPeerThread ) ;
protected
function TransLatePath( const APathname, homeDir: string ) : string;
public
constructor Create(_Directorio:String;_Anonimos: Boolean;_Sistema: TIdFTPSystems); reintroduce;
destructor Destroy; override;
end;
implementation
constructor TServidorFTP.Create(_Directorio:String;_Anonimos: Boolean;_Sistema: TIdFTPSystems);
begin
IdFTPServer := tIdFTPServer.create(nil);
Directorio:= _Directorio;
if Directorio[Length(Directorio)]='\' then
Directorio:= _Directorio
else Directorio:= _Directorio+'\';
IdFTPServer.DefaultPort := 21;
IdFTPServer.AllowAnonymousLogin := _Anonimos;
IdFTPServer.EmulateSystem := _Sistema;
IdFTPServer.HelpReply.text := 'La ayuda no esta implementada.';
IdFTPServer.OnChangeDirectory := IdFTPServer1ChangeDirectory;
IdFTPServer.OnChangeDirectory := IdFTPServer1ChangeDirectory;
IdFTPServer.OnGetFileSize := IdFTPServer1GetFileSize;
IdFTPServer.OnListDirectory := IdFTPServer1ListDirectory;
IdFTPServer.OnUserLogin := IdFTPServer1UserLogin;
IdFTPServer.OnRenameFile := IdFTPServer1RenameFile;
IdFTPServer.OnDeleteFile := IdFTPServer1DeleteFile;
IdFTPServer.OnRetrieveFile := IdFTPServer1RetrieveFile;
IdFTPServer.OnStoreFile := IdFTPServer1StoreFile;
IdFTPServer.OnMakeDirectory := IdFTPServer1MakeDirectory;
IdFTPServer.OnRemoveDirectory := IdFTPServer1RemoveDirectory;
IdFTPServer.Greeting.NumericCode := 220;
IdFTPServer.OnDisconnect := IdFTPServer1DisConnect;
IdFTPServer.Greeting.Text.Text:= 'Servidor Ftp '+IdFTPServer.LocalName;
with IdFTPServer.CommandHandlers.add do
begin
Command := 'XCRC';
OnCommand := IdFTPServer1CommandXCRC;
end;
IdFTPServer.Active := true;
end;
function CalculateCRC( const path: string ) : string;
var
f: tfilestream;
value: dword;
IdHashCRC32: TIdHashCRC32;
begin
IdHashCRC32 := nil;
f := nil;
try
IdHashCRC32 := TIdHashCRC32.create;
f := TFileStream.create( path, fmOpenRead or fmShareDenyWrite ) ;
value := IdHashCRC32.HashValue( f ) ;
result := inttohex( value, 8 ) ;
finally
f.free;
IdHashCRC32.free;
end;
end;
procedure TServidorFTP.IdFTPServer1CommandXCRC( ASender: TIdCommand ) ;
var
s: string;
begin
with TIdFTPServerThread( ASender.Thread ) do
begin
if Authenticated then
begin
try
s := ProcessPath( CurrentDir, ASender.UnparsedParams ) ;
s := TransLatePath( s, TIdFTPServerThread( ASender.Thread ) .HomeDir ) ;
ASender.Reply.SetReply( 213, CalculateCRC( s ) ) ;
except
ASender.Reply.SetReply( 500, 'error de fichero' ) ;
end;
end;
end;
end;
destructor TServidorFTP.Destroy;
begin
IdFTPServer.free;
inherited destroy;
end;
function StartsWith( const str, substr: string ) : boolean;
begin
result := copy( str, 1, length( substr ) ) = substr;
end;
function BackSlashToSlash( const str: string ) : string;
var
a: dword;
begin
result := str;
for a := 1 to length( result ) do
if result[a] = '\' then
result[a] := '/';
end;
function SlashToBackSlash( const str: string ) : string;
var
a: dword;
begin
result := str;
for a := 1 to length( result ) do
if result[a] = '/' then
result[a] := '\';
end;
function TServidorFTP.TransLatePath( const APathname, homeDir: string ) : string;
var
tmppath: string;
begin
result := SlashToBackSlash( homeDir ) ;
tmppath := SlashToBackSlash( APathname ) ;
if homedir = '/' then
begin
result := tmppath;
exit;
end;
if length( APathname ) = 0 then
exit;
if result[length( result ) ] = '\' then
result := copy( result, 1, length( result ) - 1 ) ;
if tmppath[1] '\' then
result := result + '\';
result := result + tmppath;
end;
function GetSizeOfFile( const APathname: string ) : int64;
begin
result := FileSizeByName( APathname ) ;
end;
function GetNewDirectory( old, action: string ) : string;
var
a: integer;
begin
if action = '../' then
begin
if old = '/' then
begin
result := old;
exit;
end;
a := length( old ) - 1;
while ( old[a] '\' ) and ( old[a] '/' ) do
dec( a ) ;
result := copy( old, 1, a ) ;
exit;
end;
if ( action[1] = '/' ) or ( action[1] = '\' ) then
result := action
else
result := old + action;
end;
procedure TServidorFTP.IdFTPServer1UserLogin( ASender: TIdFTPServerThread;
const AUsername, APassword: string; var AAuthenticated: Boolean ) ;
function GetNTDomainName: string;
var
hReg: TRegistry;
begin
hReg := TRegistry.Create;
hReg.RootKey := HKEY_LOCAL_MACHINE;
hReg.OpenKey('SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon', false );
Result := hReg.ReadString( 'DefaultDomainName' );
hReg.CloseKey;
hReg.Destroy;
end;
begin
AAuthenticated := LogonUserSSPI(AUsername,GetNTDomainName,APassword) ;
if not AAuthenticated then
exit;
ASender.HomeDir := Directorio;
asender.currentdir := Directorio;
end;
procedure TServidorFTP.IdFTPServer1ListDirectory( ASender: TIdFTPServerThread; const APath: string; ADirectoryListing: TIdFTPListItems ) ;
procedure AddlistItem( aDirectoryListing: TIdFTPListItems; Filename: string; ItemType: TIdDirItemType; size: int64; date: tdatetime ) ;
var
listitem: TIdFTPListItem;
begin
listitem := aDirectoryListing.Add;
listitem.ItemType := ItemType;
listitem.FileName := Filename;
listitem.OwnerName := ASender.Username;
listitem.GroupName := 'all';
listitem.OwnerPermissions := '---';
listitem.GroupPermissions := '---';
listitem.UserPermissions := '---';
listitem.Size := size;
listitem.ModifiedDate := date;
end;
var
f: tsearchrec;
a: integer;
begin
ADirectoryListing.DirectoryName := apath;
a := FindFirst( TransLatePath( apath, ASender.HomeDir ) + '*.*', faAnyFile, f ) ;
while ( a = 0 ) do
begin
if ( f.Attr and faDirectory 0 ) then
AddlistItem( ADirectoryListing, f.Name, ditDirectory, f.size, FileDateToDateTime( f.Time ) )
else
AddlistItem( ADirectoryListing, f.Name, ditFile, f.size, FileDateToDateTime( f.Time ) ) ;
a := FindNext( f ) ;
end;
FindClose( f ) ;
end;
procedure TServidorFTP.IdFTPServer1RenameFile( ASender: TIdFTPServerThread;
const ARenameFromFile, ARenameToFile: string ) ;
begin
if not MoveFile( pchar( TransLatePath( ARenameFromFile, ASender.HomeDir ) ) , pchar( TransLatePath( ARenameToFile, ASender.HomeDir ) ) ) then
RaiseLastWin32Error;
end;
procedure TServidorFTP.IdFTPServer1RetrieveFile( ASender: TIdFTPServerThread;
const AFilename: string; var VStream: TStream ) ;
begin
VStream := TFileStream.create( translatepath( AFilename, ASender.HomeDir ) , fmopenread or fmShareDenyWrite ) ;
end;
procedure TServidorFTP.IdFTPServer1StoreFile( ASender: TIdFTPServerThread;
const AFilename: string; AAppend: Boolean; var VStream: TStream ) ;
begin
if FileExists( translatepath( AFilename, ASender.HomeDir ) ) and AAppend then
begin
VStream := TFileStream.create( translatepath( AFilename, ASender.HomeDir ) , fmOpenWrite or fmShareExclusive ) ;
VStream.Seek( 0, soFromEnd ) ;
end
else
VStream := TFileStream.create( translatepath( AFilename, ASender.HomeDir ) , fmCreate or fmShareExclusive ) ;
end;
procedure TServidorFTP.IdFTPServer1RemoveDirectory( ASender: TIdFTPServerThread;
var VDirectory: string ) ;
begin
RmDir( TransLatePath( VDirectory, ASender.HomeDir ) ) ;
end;
procedure TServidorFTP.IdFTPServer1MakeDirectory( ASender: TIdFTPServerThread;
var VDirectory: string ) ;
begin
MkDir( TransLatePath( VDirectory, ASender.HomeDir ) ) ;
end;
procedure TServidorFTP.IdFTPServer1GetFileSize( ASender: TIdFTPServerThread;
const AFilename: string; var VFileSize: Int64 ) ;
begin
VFileSize := GetSizeOfFile( TransLatePath( AFilename, ASender.HomeDir ) ) ;
end;
procedure TServidorFTP.IdFTPServer1DeleteFile( ASender: TIdFTPServerThread;
const APathname: string ) ;
begin
DeleteFile( pchar( TransLatePath( ASender.CurrentDir + '/' + APathname, ASender.HomeDir ) ) ) ;
end;
procedure TServidorFTP.IdFTPServer1ChangeDirectory( ASender: TIdFTPServerThread;
var VDirectory: string ) ;
begin
VDirectory := GetNewDirectory( ASender.CurrentDir, VDirectory ) ;
end;
procedure TServidorFTP.IdFTPServer1DisConnect( AThread: TIdPeerThread ) ;
begin
//**
end;
end.