function memLoadLibrary(pLib: Pointer): DWord; function memGetProcAddress(dwLibHandle: DWord; pFunctionName: PChar): Pointer; stdcall; function memFreeLibrary(dwHandle: DWord): Boolean;
implementation
procedure ChangeReloc(baseorgp, basedllp, relocp: pointer; size: cardinal); type TRelocblock = record vaddress: integer; size: integer; end; PRelocblock = ^TRelocblock; var myreloc: PRelocblock; reloccount: integer; startp: ^word; i: cardinal; p: ^cardinal; dif: cardinal; begin myreloc := relocp; dif := cardinal(basedllp)-cardinal(baseorgp); startp := pointer(cardinal(relocp)+8); while myreloc^.vaddress <> 0 do begin reloccount := (myreloc^.size-8) div sizeof(word); for i := 0 to reloccount-1 do begin if (startp^ xor $3000 < $1000) then begin p := pointer(myreloc^.vaddress+startp^ mod $3000+integer(basedllp)); p^ := p^+dif; end; startp := pointer(cardinal(startp)+sizeof(word)); end; myreloc := pointer(startp); startp := pointer(cardinal(startp)+8); end; end; procedure CreateImportTable(dllbasep, importp: pointer); stdcall; type timportblock = record Characteristics: cardinal; TimeDateStamp: cardinal; ForwarderChain: cardinal; Name: pchar; FirstThunk: pointer; end; pimportblock = ^timportblock; var myimport: pimportblock; thunksread, thunkswrite: ^pointer; dllname: pchar; dllh: thandle; old: cardinal; begin myimport := importp; while (myimport^.FirstThunk <> nil) and (myimport^.Name <> nil) do begin dllname := pointer(integer(dllbasep)+integer(myimport^.name)); dllh := LoadLibrary(dllname); thunksread := pointer(integer(myimport^.FirstThunk)+integer(dllbasep)); thunkswrite := thunksread; if integer(myimport^.TimeDateStamp) = -1 then thunksread := pointer(integer(myimport^.Characteristics)+integer(dllbasep)); while (thunksread^ <> nil) do begin if VirtualProtect(thunkswrite,4,PAGE_EXECUTE_READWRITE,old) then begin if (cardinal(thunksread^) and $80000000 <> 0) then thunkswrite^ := GetProcAddress(dllh,pchar(cardinal(thunksread^) and $FFFF)) else thunkswrite^ := GetProcAddress(dllh,pchar(integer(dllbasep)+integer(thunksread^)+2)); VirtualProtect(thunkswrite,4,old,old); end; inc(thunksread,1); inc(thunkswrite,1); end; myimport := pointer(integer(myimport)+sizeof(timportblock)); end; end;
function memLoadLibrary(pLib: Pointer): DWord; var DllMain : function (dwHandle, dwReason, dwReserved: DWord): DWord; stdcall; IDH : PImageDosHeader; INH : PImageNtHeaders; SEC : PImageSectionHeader; dwSecCount : DWord; dwLen : DWord; dwmemsize : DWord; i : Integer; pAll : Pointer; begin Result := 0;
IDH := pLib; if isBadReadPtr(IDH, SizeOf(TImageDosHeader)) or (IDH^.e_magic <> IMAGE_DOS_SIGNATURE) then Exit;
INH := pointer(cardinal(pLib)+cardinal(IDH^._lfanew)); if isBadReadPtr(INH, SizeOf(TImageNtHeaders)) or (INH^.Signature <> IMAGE_NT_SIGNATURE) then Exit;
// if (pReserved <> nil) then // dwLen := Length(pReserved)+1 // else dwLen := 0;
SEC := Pointer(Integer(INH)+SizeOf(TImageNtHeaders)); dwMemSize := INH^.OptionalHeader.SizeOfImage; if (dwMemSize = 0) then Exit;
pAll := VirtualAlloc(nil,dwMemSize+dwLen,MEM_COMMIT or MEM_RESERVE,PAGE_EXECUTE_READWRITE); if (pAll = nil) then Exit;
dwSecCount := INH^.FileHeader.NumberOfSections; CopyMemory(pAll,IDH,DWord(SEC)-DWord(IDH)+dwSecCount*SizeOf(TImageSectionHeader)); // CopyMemory(Pointer(DWord(pAll) + dwMemSize),pReserved,dwLen-1); CopyMemory(Pointer(DWord(pAll) + dwMemSize),nil,dwLen-1); for i := 0 to dwSecCount-1 do begin CopyMemory(Pointer(DWord(pAll)+SEC^.VirtualAddress), Pointer(DWord(pLib)+DWord(SEC^.PointerToRawData)), SEC^.SizeOfRawData); SEC := Pointer(Integer(SEC)+SizeOf(TImageSectionHeader)); end;
if (INH^.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress <> 0) then ChangeReloc(Pointer(INH^.OptionalHeader.ImageBase), pAll, Pointer(DWord(pAll)+INH^.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress), INH^.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size); CreateImportTable(pAll, Pointer(DWord(pAll)+INH^.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress));
@DllMain := Pointer(INH^.OptionalHeader.AddressOfEntryPoint+DWord(pAll)); // if (INH^.OptionalHeader.AddressOfEntryPoint <> 0) and (bDllMain) then if INH^.OptionalHeader.AddressOfEntryPoint <> 0 then begin try // if (pReserved <> nil) then // DllMain(DWord(pAll),DLL_PROCESS_ATTACH,DWord(pAll)+dwMemSize) // else DllMain(DWord(pAll),DLL_PROCESS_ATTACH,0); except end; end; Result := DWord(pAll); end;
function memFreeLibrary(dwHandle: DWord): Boolean; var IDH: PImageDosHeader; INH: PImageNTHeaders; begin Result := false; if (dwHandle = 0) then Exit;
IDH := Pointer(dwHandle); if (IDH^.e_magic <> IMAGE_DOS_SIGNATURE) then Exit;
INH := Pointer(DWord(IDH^._lfanew)+DWord(IDH)); if (INH^.Signature <> IMAGE_NT_SIGNATURE) then Exit;
if VirtualFree(Pointer(dwHandle),INH^.OptionalHeader.SizeOfImage,MEM_DECOMMIT) then Result := True; end;
function memGetProcAddress(dwLibHandle: DWord; pFunctionName: PChar): Pointer; stdcall; var NtHeader : PImageNtHeaders; DosHeader : PImageDosHeader; DataDirectory : PImageDataDirectory; ExportDirectory : PImageExportDirectory; i : Integer; iExportOrdinal : Integer; ExportName : String; dwPosDot : DWord; dwNewmodule : DWord; pFirstExportName : Pointer; pFirstExportAddress: Pointer; pFirstExportOrdinal: Pointer; pExportAddr : PDWord; pExportNameNow : PDWord; pExportOrdinalNow : PWord; begin Result := nil; if pFunctionName = nil then Exit;
DosHeader := Pointer(dwLibHandle); if isBadReadPtr(DosHeader,sizeof(TImageDosHeader)) or (DosHeader^.e_magic <> IMAGE_DOS_SIGNATURE) then Exit; {Wrong PE (DOS) Header}
NtHeader := Pointer(DWord(DosHeader^._lfanew)+DWord(DosHeader)); if isBadReadPtr(NtHeader, sizeof(TImageNTHeaders)) or (NtHeader^.Signature <> IMAGE_NT_SIGNATURE) then Exit; {Wrong PW (NT) Header}
DataDirectory := @NtHeader^.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT]; if (DataDirectory = nil) or (DataDirectory^.VirtualAddress = 0) then Exit; {Library has no exporttable}
ExportDirectory := Pointer(DWord(DosHeader) + DWord(DataDirectory^.VirtualAddress)); if isBadReadPtr(ExportDirectory,SizeOf(TImageExportDirectory)) then Exit;
if (integer(pFunctionName) > $FFFF) then {is FunctionName a PChar?} begin iExportOrdinal := -1; {if we dont find the correct ExportOrdinal} for i := 0 to ExportDirectory^.NumberOfNames-1 do {for each export do} begin pExportNameNow := Pointer(Integer(pFirstExportName)+SizeOf(Pointer)*i); if (not isBadReadPtr(pExportNameNow,SizeOf(DWord))) then begin ExportName := PChar(pExportNameNow^+ DWord(DosHeader)); if (ExportName = pFunctionName) then {is it the export we search? Calculate the ordinal.} begin pExportOrdinalNow := Pointer(Integer(pFirstExportOrdinal)+SizeOf(Word)*i); if (not isBadReadPtr(pExportOrdinalNow,SizeOf(Word))) then iExportOrdinal := pExportOrdinalNow^; end; end; end; end else{no PChar, calculate the ordinal directly} iExportOrdinal := DWord(pFunctionName)-DWord(ExportDirectory^.Base);
if (iExportOrdinal < 0) or (iExportOrdinal > Integer(ExportDirectory^.NumberOfFunctions)) then Exit; {havent found the ordinal}
pExportAddr := Pointer(iExportOrdinal*4+Integer(pFirstExportAddress)); if (isBadReadPtr(pExportAddr,SizeOf(DWord))) then Exit;
{Is the Export outside the ExportSection? If not its NT spezific forwared function} if (pExportAddr^ < DWord(DataDirectory^.VirtualAddress)) or (pExportAddr^ > DWord(DataDirectory^.VirtualAddress+DataDirectory^.Size)) then begin if (pExportAddr^ <> 0) then {calculate export address} Result := Pointer(pExportAddr^+DWord(DosHeader)); end else begin {forwarded function (like kernel32.EnterCriticalSection -> NTDLL.RtlEnterCriticalSection)} ExportName := PChar(dwLibHandle+pExportAddr^); dwPosDot := Pos('.',ExportName); if (dwPosDot > 0) then begin dwNewModule := GetModuleHandle(PChar(Copy(ExportName,1,dwPosDot-1))); if (dwNewModule = 0) then dwNewModule := LoadLibrary(PChar(Copy(ExportName,1,dwPosDot-1))); if (dwNewModule <> 0) then result := GetProcAddressX(dwNewModule,PChar(Copy(ExportName,dwPosDot+1,Length(ExportName)))); end; end; end;
