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7.8

LoadLibrary() from resource

Asked by ThievingSix in Delphi Programming, Microsoft Visual C++.Net, C++ Programming Language

Alright, found this: http://www.joachim-bauch.de/tutorials/load_dll_memory.html and translated it to delphi. I know this works in C++.

I have a DLL that was created in VS2008 and uses MSVCP80.dll. If I statically link functions via "external" it works fine. After translating the code(as seen below) I step through each line to make sure everything is working fine.

The function I'm having trouble with is BuildImportTable - line 205 below. This goes through the DLL's imports and calls LoadLibrary on each one then gets the address for each of the imported functions.

This works fine for kernel32.dll. The second dll imported is MSVCP80.dll. I get the error: "The specified module could not be found." from  GetLastError when LoadLibrary fails. This means that the dll can't be found.

Curious as to why the application seems to find it fine when statically linking functions and not now, I find the dll and put it in my applications directory. After retrying I get: " An application has made an attempt to load the C runtime library incorrectly." Meaning I need a manifest for my application to load this.

Why in the world does this fail like this?
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unit MemoryModule;
 
interface
 
uses
  SysUtils,
  Windows;
 
type
  HMemoryModule = Pointer;
  PMemoryModule = ^TMemoryModule;
  TMemoryModule = record
    Headers: PImageNtHeaders;
    CodeBase: Pointer;
    Modules: Pointer;
    NumModules,
    Initialized: Integer;
  end;
  TDLLEntryProc = function(hInstDLL, Reason: DWORD; lpReserved: Pointer): BOOL; stdcall;
  PImageBaseRelocation = ^TImageBaseRelocation;
  TImageBaseRelocation = packed record
    VirtualAddress,
    SizeOfBlock: DWORD;
  end;
  PImageImportDescriptor = ^TImageImportDescriptor;
  TImageImportDescriptor = packed record
    Case Integer Of
      0:(Characteristics: DWORD);
      1:(OriginalFirstThunk: DWORD; TimeDateStamp: DWORD; ForwarderChain: DWORD; Name: DWORD; FirstThunk: DWORD);
  end;
  PImageImportByName = ^TImageImportByName;
  TImageImportByName = packed record
    Hint: WORD;
    Name: Array[0..255] Of Byte;
  end;
 
const
  IMAGE_DIRECTORY_ENTRY_BASERELOC = 5;
  IMAGE_REL_BASED_HIGHLOW = 3;
  IMAGE_ORDINAL_FLAG = $80000000;
  IMAGE_SIZEOF_BASE_RELOCATION = SizeOf(TImageBaseRelocation);
  ProtectionFlags : Array[Boolean,Boolean,Boolean] Of Integer =
                    (((PAGE_NOACCESS,PAGE_WRITECOPY),
                     (PAGE_READONLY,PAGE_READWRITE)),
                    ((PAGE_EXECUTE,PAGE_EXECUTE_WRITECOPY),
                     (PAGE_EXECUTE_READ,PAGE_EXECUTE_READWRITE)));
 
{--------------------------------------------------------------------------------------}
function MemoryLoadLibrary(Data: Pointer): HMemoryModule;
function MemoryGetProcAddress(MemoryModule: HMemoryModule; Name: PAnsiChar): Pointer;
procedure MemoryFreeLibrary(MemoryModule: HMemoryModule);
{--------------------------------------------------------------------------------------}
 
implementation
 
function GetHeaderDictionary(MemoryModule: PMemoryModule; IDX: Integer): TImageDataDirectory;
begin
  Result := MemoryModule^.Headers^.OptionalHeader.DataDirectory[IDX];
end;
 
function CalculateAddress(Base: Pointer; Offset: DWORD): Pointer;
begin
  Result := Pointer(DWORD(Base) + Offset);
end;
 
function FieldOffset(const Struc; const Field): DWORD;
begin
  Result := DWORD(@Field) - DWORD(@Struc);
end;
 
function ImageFirstSection(NtHeader: PImageNtHeaders): PImageSectionHeader;
begin
  Result := PImageSectionHeader(DWORD(NtHeader) + FieldOffset(NtHeader^, NtHeader^.OptionalHeader) + NtHeader^.FileHeader.SizeOfOptionalHeader);
end;
 
function ImageSnapByOrdinal(Ordinal: DWORD): Boolean;
begin
  Result := (Ordinal And IMAGE_ORDINAL_FLAG) <> 0;
end;
 
function ImageOrdinal(Ordinal: DWORD): DWORD;
begin
  Result := Ordinal And $FFFF;
end;
 
procedure CopySections(Data: Pointer; OldHeaders: PImageNtHeaders; MemoryModule: PMemoryModule);
var
  I : Integer;
  Size : DWORD;
  CodeBase,
  Dest : Pointer;
  Section : PImageSectionHeader;
begin
  CodeBase := MemoryModule^.CodeBase;
  Section := ImageFirstSection(MemoryModule^.Headers);
  For I := 0 To MemoryModule^.Headers^.FileHeader.NumberOfSections - 1 Do
    begin
    If Section^.SizeOfRawData = 0 Then
      begin
      Size := OldHeaders^.OptionalHeader.SectionAlignment;
      If Size > 0 Then
        begin
        Dest := VirtualAlloc(CalculateAddress(CodeBase,Section^.VirtualAddress),Size,MEM_COMMIT,PAGE_READWRITE);
        Section^.Misc.PhysicalAddress := DWORD(Dest);
        FillChar(Dest^,Size,0);
      end;
      Inc(Section);
      Continue;
    end;
    Dest := VirtualAlloc(CalculateAddress(CodeBase,Section^.VirtualAddress),Section^.SizeOfRawData,MEM_COMMIT,PAGE_READWRITE);
    Windows.CopyMemory(Dest,CalculateAddress(Data,Section^.PointerToRawData),Section^.SizeOfRawData);
    Section^.Misc.PhysicalAddress := DWORD(Dest);
    Inc(Section);
  end;
end;
 
procedure FinalizeSections(MemoryModule: PMemoryModule);
var
  I : Integer;
  Section : PImageSectionHeader;
  Executable,
  Readable,
  Writeable : Boolean;
  Protect,
  OldProtect,
  Size : DWORD;
begin
  Section := ImageFirstSection(MemoryModule^.Headers);
  For I := 0 To MemoryModule^.Headers^.FileHeader.NumberOfSections - 1 Do
    begin
    Executable := (Section^.Characteristics And IMAGE_SCN_MEM_EXECUTE) <> 0;
    Readable := (Section^.Characteristics And IMAGE_SCN_MEM_READ) <> 0;
    Writeable := (Section^.Characteristics And IMAGE_SCN_MEM_WRITE) <> 0;
    If (Section^.Characteristics And IMAGE_SCN_MEM_DISCARDABLE) <> 0 Then
      begin
      VirtualFree(Pointer(Section^.Misc.PhysicalAddress),Section^.SizeOfRawData,MEM_DECOMMIT);
      Inc(Section);
      Continue;
    end;
    Protect := ProtectionFlags[Executable][Readable][Writeable];
    If (Section^.Characteristics And IMAGE_SCN_MEM_NOT_CACHED) <> 0 Then
      begin
      Protect := Protect Or PAGE_NOCACHE;
    end;
    Size := Section^.SizeOfRawData;
    If Size = 0 Then
      begin
      If (Section^.Characteristics And IMAGE_SCN_CNT_INITIALIZED_DATA) <> 0 Then
        begin
        Size := MemoryModule^.Headers^.OptionalHeader.SizeOfInitializedData;
      end
      Else If (Section^.Characteristics And IMAGE_SCN_CNT_UNINITIALIZED_DATA) <> 0 Then
        begin
        Size := MemoryModule^.Headers.OptionalHeader.SizeOfUninitializedData;
      end;
    end;
    If Size > 0 Then
      begin
      VirtualProtect(Pointer(Section^.Misc.PhysicalAddress),Section^.SizeOfRawData,Protect,OldProtect);
    end;
    Inc(Section);
  end;
end;
 
procedure PerformBaseRelocation(MemoryModule: PMemoryModule; Delta: DWORD);
var
  I : DWORD;
  CodeBase : Pointer;
  Directory : TImageDataDirectory;
  Relocation : PImageBaseRelocation;
  Dest,
  RelInfo,
  PatchAddrHL : Pointer;
  iType,
  Offset : Integer;
begin
  CodeBase := MemoryModule^.CodeBase;
  Directory := GetHeaderDictionary(MemoryModule,IMAGE_DIRECTORY_ENTRY_BASERELOC);
  If Directory.Size > 0 Then
    begin
    Relocation := PImageBaseRelocation(CalculateAddress(CodeBase,Directory.VirtualAddress));
    While Relocation^.VirtualAddress > 0 Do
      begin
      Dest := CalculateAddress(CodeBase,Relocation^.VirtualAddress);
      RelInfo := Pointer(DWORD(@Relocation) + IMAGE_SIZEOF_BASE_RELOCATION);
      For I := 0 To ((Relocation^.SizeOfBlock - IMAGE_SIZEOF_BASE_RELOCATION) div 2) - 1 Do
        begin
        iType := PWORD(RelInfo)^ SHR 12;
        Offset := PWORD(RelInfo)^ And $0FFF;
        Case iType Of
          //IMAGE_REL_BASED_ABSOLUTE:
          IMAGE_REL_BASED_HIGHLOW:
            begin
            PatchAddrHL := CalculateAddress(Dest,Offset);
            Inc(PByte(PatchAddrHL),Delta);
          end;
        end;
        Inc(PWORD(RelInfo));
      end;
      Relocation := PImageBaseRelocation(CalculateAddress(Relocation,Relocation^.SizeOfBlock));
    end;
  end;
end;
 
function BuildImportTable(MemoryModule: PMemoryModule): Integer;
var
  CodeBase : Pointer;
  Directory : TImageDataDirectory;
  ImportDesc : PImageImportDescriptor;
  ThunkRef,
  FuncRef : Pointer;
  Handle : DWORD;
  ThunkData : PImageImportByName;
  LibraryName : AnsiString;
begin
  Result := 1;
  CodeBase := MemoryModule^.CodeBase;
  Directory := GetHeaderDictionary(MemoryModule,IMAGE_DIRECTORY_ENTRY_IMPORT);
  If Directory.Size > 0 Then
    begin
    ImportDesc := PImageImportDescriptor(CalculateAddress(CodeBase,Directory.VirtualAddress));
    While (Not(IsBadReadPtr(ImportDesc,SizeOf(TImageImportDescriptor)))) And (ImportDesc^.Name > 0) Do
      begin
      LibraryName := PAnsiChar(CalculateAddress(CodeBase,ImportDesc^.Name));
      Handle := LoadLibraryA(PAnsiChar(LibraryName));
      If Handle < HINSTANCE_ERROR Then
        begin
        MessageBox(0,PChar(SysErrorMessage(GetLastError)),'',0);
        Result := 0;
        Break;
      end;
      ReAllocMem(MemoryModule^.Modules,(MemoryModule^.NumModules + 1) * SizeOf(DWORD));
      If MemoryModule^.Modules = nil Then
        begin
        Result := 0;
        Break;
      end;
      PDWORD(@PByte(MemoryModule^.Modules)[(MemoryModule^.NumModules + 1) * SizeOf(DWORD)])^ := Handle;
      If ImportDesc^.OriginalFirstThunk <> 0 Then
        begin
        ThunkRef := CalculateAddress(CodeBase,ImportDesc^.OriginalFirstThunk);
        FuncRef := CalculateAddress(CodeBase,ImportDesc^.FirstThunk);
      end
      Else
        begin
        ThunkRef := CalculateAddress(CodeBase,ImportDesc^.FirstThunk);
        FuncRef := CalculateAddress(CodeBase,ImportDesc^.FirstThunk);
      end;
      While PDWORD(ThunkRef)^ > 0 Do
        begin
        If ImageSnapByOrdinal(PDWORD(ThunkRef)^) Then
          begin
          PDWORD(FuncRef)^ := DWORD(GetProcAddress(Handle,PAnsiChar(Pointer(ImageOrdinal(PDWORD(ThunkRef)^)))));
        end
        Else
          begin
          ThunkData := PImageImportByName(CalculateAddress(CodeBase,PDWORD(ThunkRef)^));
          PDWORD(FuncRef)^ := DWORD(GetProcAddress(Handle,PAnsiChar(@ThunkData^.Name)));
        end;
        If PDWORD(FuncRef)^ = 0 Then
          begin
          Result := 0;
          Break;
        end;
        Inc(PDWORD(ThunkRef));
        Inc(PDWORD(FuncRef));
      end;
      If Result = 0 Then Break;
      Inc(ImportDesc);
    end;
  end;
end;
 
function MemoryLoadLibrary(Data: Pointer): HMemoryModule;
var
  pResult : PMemoryModule;
  DosHeader : PImageDosHeader;
  OldHeader : PImageNtHeaders;
  Code,
  Headers : Pointer;
  LocationDelta : DWORD;
  DLLEntry : TDLLEntryProc;
  Successful : Boolean;
begin
  Result := nil;
  DosHeader := PImageDosHeader(Data);
  If DosHeader^.e_magic <> IMAGE_DOS_SIGNATURE Then Exit;
  OldHeader := PImageNtHeaders(@PByte(Data)[DosHeader^._lfanew]);
  If OldHeader^.Signature <> IMAGE_NT_SIGNATURE Then Exit;
  Code := VirtualAlloc(Pointer(OldHeader^.OptionalHeader.ImageBase),OldHeader.OptionalHeader.SizeOfImage,MEM_RESERVE,PAGE_READWRITE);
  If Code = nil Then
    begin
    Code := VirtualAlloc(nil,OldHeader^.OptionalHeader.SizeOfImage,MEM_RESERVE,PAGE_READWRITE);
    If Code = nil Then Exit;
  end;
  pResult := PMemoryModule(HeapAlloc(GetProcessHeap,0,SizeOf(TMemoryModule)));
  pResult^.CodeBase := Code;
  pResult^.NumModules := 0;
  pResult^.Modules := nil;
  pResult^.Initialized := 0;
  VirtualAlloc(Code,OldHeader^.OptionalHeader.SizeOfImage,MEM_COMMIT,PAGE_READWRITE);
  Headers := VirtualAlloc(Code,OldHeader^.OptionalHeader.SizeOfHeaders,MEM_COMMIT,PAGE_READWRITE);
  {$WARNINGS OFF}
  Move(DosHeader^,Headers^,DosHeader^._lfanew + OldHeader^.OptionalHeader.SizeOfHeaders);
  {$WARNINGS ON}
  pResult^.Headers := PImageNtHeaders(@PByte(Headers)[DosHeader^._lfanew]);
  pResult^.Headers^.OptionalHeader.ImageBase := DWORD(Code);
  CopySections(Data,OldHeader,pResult);
  LocationDelta := DWORD(PByte(Code) - OldHeader^.OptionalHeader.ImageBase);
  If LocationDelta <> 0 Then
    begin
    PerformBaseRelocation(pResult,LocationDelta);
  end;
  Try
    If Not(BuildImportTable(pResult) <> 0) Then Exit;
    FinalizeSections(pResult);
    If pResult^.Headers^.OptionalHeader.AddressOfEntryPoint <> 0 Then
      begin
      DLLEntry := TDLLEntryProc(CalculateAddress(Code,pResult^.Headers^.OptionalHeader.AddressOfEntryPoint));
      If @DLLEntry = nil Then Exit;
      Successful := DLLEntry(DWORD(Code),DLL_PROCESS_ATTACH,nil);
      If Not(Successful) Then Exit;
      pResult^.Initialized := 1;
    end;
    Result := HMemoryModule(pResult);
  Except
    MemoryFreeLibrary(pResult);
  end;
end;
 
function MemoryGetProcAddress(MemoryModule: HMemoryModule; Name: PAnsiChar): Pointer;
var
  CodeBase : Pointer;
  IDX : Integer;
  I : DWORD;
  NameRef : Pointer;
  Ordinal : Pointer;
  pExports : PImageExportDirectory;
  Directory : TImageDataDirectory;
begin
  Result := nil;
  CodeBase := PMemoryModule(MemoryModule)^.CodeBase;
  IDX := -1;
  Directory := GetHeaderDictionary(PMemoryModule(MemoryModule),IMAGE_DIRECTORY_ENTRY_EXPORT);
  If Directory.Size = 0 Then Exit;
  pExports := PImageExportDirectory(CalculateAddress(CodeBase,Directory.VirtualAddress));
  If (pExports^.NumberOfNames = 0) Or (pExports^.NumberOfFunctions = 0) Then Exit;
  NameRef := CalculateAddress(CodeBase,DWORD(pExports^.AddressOfNames));
  Ordinal := CalculateAddress(CodeBase,DWORD(pExports^.AddressOfNameOrdinals));
  For I := 0 To pExports^.NumberOfNames - 1 Do
    begin
    If CompareStringA(LOCALE_USER_DEFAULT,0,Name,-1,PAnsiChar(CalculateAddress(CodeBase,PDWORD(NameRef)^)),-1) <> -2 Then
      begin
      IDX := PWORD(Ordinal)^;
      Break;
    end;
    Inc(PDWORD(NameRef));
    Inc(PWORD(Ordinal));
  end;
  If IDX = -1 Then Exit;
  If DWORD(IDX) > pExports^.NumberOfFunctions Then Exit;
  {$WARNINGS OFF}
  Result := CalculateAddress(CodeBase,PDWORD(CalculateAddress(CodeBase,DWORD(pExports^.AddressOfFunctions) + (IDX * SizeOf(DWORD))))^);
  {$WARNINGS ON}
end;
 
procedure MemoryFreeLibrary(MemoryModule: HMemoryModule);
var
  I : Integer;
  Module : PMemoryModule;
  DLLEntry : TDLLEntryProc;
begin
  Module := PMemoryModule(MemoryModule);
  If Module <> nil Then
    begin
    If Module^.Initialized <> 0 Then
      begin
      DLLEntry := TDLLEntryProc(CalculateAddress(Module^.CodeBase,Module^.Headers^.OptionalHeader.AddressOfEntryPoint));
      DllEntry(DWORD(Module^.CodeBase),DLL_PROCESS_DETACH,nil);
      Module^.Initialized := 0;
    end;
    If Module^.Modules <> nil Then
      begin
      For I := 0 To Module^.NumModules - 1 Do
        begin
        If PDWORD(@PByte(Module^.Modules)[(I + 1) * SizeOf(DWORD)])^ <> INVALID_HANDLE_VALUE Then
          begin
          FreeLibrary(PDWORD(@PByte(Module^.Modules)[(I + 1) * SizeOf(DWORD)])^);
        end;
      end;
      Freemem(Module^.Modules);
    end;
    If Module^.CodeBase <> nil Then
      begin
      VirtualFree(Module^.CodeBase,0,MEM_RELEASE);
    end;
    HeapFree(GetProcessHeap,0,Module);
  end;
end;
 
 
end.
[+][-]09/26/09 05:15 AM, ID: 25429611Accepted Solution

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About this solution

Zones: Delphi Programming, Microsoft Visual C++.Net, C++ Programming Language
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Solution Provided By: itsmeandnobodyelse
Participating Experts: 1
Solution Grade: A
 
[+][-]09/26/09 11:12 AM, ID: 25430718Author Comment

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