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[Delphi] Store Function in Resource Section of Executable

counterstrikewi

By counterstrikewi
in Programming and Coding

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counterstrikewi

counterstrikewi

Posted
Posted (edited)

hi,

I am trying to store a custom procedure within the resource section of my executable.

Then, I hope to call that procedure from resource.

I have a basic example working and I have posted full delphi source code for this example.

However, there are limitations.

I am having trouble retrieving return values from Windows API.

As you can see in the code below, if you compile both executables with the comment in the builder intact, then run the builder, next the stub, it works perfectly. However, if you remove the comment in the builder to assign a local variable to the result of a Windows API, then run the builder, next the stub, it results in an error :(

Builder:


program Builder;
//ic0de.org
//cswi <3 abhe
{$APPTYPE CONSOLE}uses
  Windows;const
  cFuncIn : PWideChar = 'FUNCIN';type
  TMessageBoxA = function (hWnd: Cardinal; lpText, lpCaption: PAnsiChar; uType: LongWord): LongWord; stdcall;
  TGetProcAddress = function (hModule: Cardinal; lpProcName: pAnsiChar): Pointer; stdcall;
  TLoadLibraryA = function(lpLibFileName: PAnsiChar): Cardinal; stdcall;  TFuncInRecord = Record
    xMessageBoxA : TMessageBoxA;
    xGetProcAddress : TGetProcAddress;
    xLoadLibraryA : TLoadLibraryA;
    gpUser32 : pAnsiChar;
    gpMessageBoxA : pAnsiChar;
    gpString : pAnsiChar;
  end;
  PFuncInRecord = ^TFuncInRecord;procedure FuncIn(pData : PFuncInRecord; lpTitle, lpMessage : pAnsiChar);
var
  lhKernel : Cardinal;
  lpString : pAnsiChar;
  dwResult : LongWord;
begin
  with pData^ do
  begin
    lpString := gpString;
    {dwResult := }xMessageBoxA(0, lpString, lpTitle, MB_YESNO);
  end;
end;Function WriteResData(pFile: pointer; Size: integer; pwName: pWideChar):Boolean;
const
  pwServerFile : PWideChar = 'Stub.exe'  ;
var
  hResourceHandle: THandle;
begin
  hResourceHandle := BeginUpdateResourceW(pwServerFile, False);
  Result := UpdateResourceW(hResourceHandle, MakeIntResourceW(10), pwName, 0, pFile, Size);
  EndUpdateResourceW(hResourceHandle, False);
end;function SizeOfProc(pAddr: pointer): Cardinal;
var dwSize: Cardinal;
begin
  dwSize := 0;
  repeat
    inc(dwSize);
  until PByte(Cardinal(pAddr)+dwSize-1)^ = $C3;
  Result := dwSize;
end;begin
  WriteResData(@FuncIn, SizeOfProc(@FuncIn), cFuncIn);
end.

Stub:


//ic0de.org
program Stub;{$APPTYPE CONSOLE}uses
  Windows;const
  cFuncIn : PWideChar = 'FUNCIN';type
  TMessageBoxA = function (hWnd: Cardinal; lpText, lpCaption: PAnsiChar; uType: LongWord): LongWord; stdcall;
  TGetProcAddress = function (hModule: Cardinal; lpProcName: pAnsiChar): Pointer; stdcall;
  TLoadLibraryA = function(lpLibFileName: PAnsiChar): Cardinal; stdcall;  TFuncInRecord = Record
    xMessageBoxA : TMessageBoxA;
    xGetProcAddress : TGetProcAddress;
    xLoadLibraryA : TLoadLibraryA;
    gpUser32 : pAnsiChar;
    gpMessageBoxA : pAnsiChar;
    gpString : pAnsiChar;
  end;
  PFuncInRecord = ^TFuncInRecord;  TFuncIn = procedure(pData : PFuncInRecord; lpTitle, lpMessage : pAnsiChar);procedure ResGet(ResName: pwidechar; var data : pointer; var Size:dword);
var
  ResSrc: hRSrc;
  ResGlobal: hGlobal;
begin
  ResSrc := FindResourceW(hInstance, ResName, MakeIntResourceW(10));
  ResGlobal := LoadResource(hInstance, ResSrc);
  data := LockResource(ResGlobal);
  Size := SizeofResource(hInstance, ResSrc);
end;var
  FuncIn : TFuncIn;
  pResource : Pointer;
  dwResourceSize :dword;
  AFuncInRecord : TFuncInRecord;
begin
  AFuncInRecord.xMessageBoxA := @MessageBoxA;
  AFuncInRecord.xGetProcAddress := @GetProcAddress;
  AFuncInRecord.xLoadLibraryA := @LoadLibraryA;
  AFuncInRecord.gpUser32 := 'user32.dll';
  AFuncInRecord.gpMessageBoxA := 'MessageBoxA';
  AFuncInRecord.gpString := 'Test';
  ResGet(cFuncIn, pResource, dwResourceSize);
  CopyMemory(@FuncIn, pResource, dwResourceSize);
  FuncIn(@AFuncInRecord,'Title','Caption');
end.

I look forward to reading your responses.

Thank you

Edited by counterstrikewi
counterstrikewi

counterstrikewi

Posted
  • Author
Posted

Completed; although if you have something to criticize or add, i would love to hear your comment.

Authors: Counterstrikewi, Abhe & Steve10120

Websites: delphibasics.info & ic0de.org

Compiled: Delphi 2007

http://www.delphibasics.info/home/delphibasicscounterstrikewireleases/func-indelphiexample

Builder:


program Builder;
//delphibasics.info & ic0de.org
//cswi <3 abhe & steve10120
{$APPTYPE CONSOLE}uses
  Windows;const
  cFuncIn : PWideChar = 'FUNCIN';type
  TGetProcAddress = function (hModule: Cardinal; lpProcName: pAnsiChar): Pointer; stdcall;
  TLoadLibraryA = function(lpLibFileName: PAnsiChar): Cardinal; stdcall;  TFuncInRecord = Record
    xGetProcAddress : TGetProcAddress;
    xLoadLibraryA : TLoadLibraryA;
    gpUser32 : pAnsiChar;
    gpMessageBoxA : pAnsiChar;
    gpString : pAnsiChar;
  end;
  PFuncInRecord = ^TFuncInRecord;procedure FuncIn(pData : PFuncInRecord; lpTitle, lpMessage : pAnsiChar);
type
  TMessageBoxA = function (hWnd: Cardinal; lpText, lpCaption: PAnsiChar; uType: LongWord): LongWord; stdcall;
var
  xMessageBoxA : TMessageBoxA;
  lhKernel : Cardinal;
  lpString : pAnsiChar;
  dwResult : LongWord;
begin
  with pData^ do
  begin
    lpString := gpString;
    lhKernel := xLoadLibraryA(gpUser32);
    @xMessageBoxA := xGetProcAddress(lhKernel, gpMessageBoxA);
    if Assigned(xMessageBoxA) then
    begin
      dwResult := xMessageBoxA(0, lpString, lpTitle, MB_YESNO);
      if dwResult = 6 then
        xMessageBoxA(0, lpString, lpTitle, MB_YESNO);
    end;
  end;
end;Function WriteResData(pFile: pointer; Size: integer; pwName: pWideChar):Boolean;
const
  pwServerFile : PWideChar = 'Stub.exe'  ;
var
  hResourceHandle: THandle;
begin
  hResourceHandle := BeginUpdateResourceW(pwServerFile, False);
  Result := UpdateResourceW(hResourceHandle, MakeIntResourceW(10), pwName, 0, pFile, Size);
  EndUpdateResourceW(hResourceHandle, False);
end;function SizeOfProc(pAddr: pointer): Cardinal;
var dwSize: Cardinal;
begin
  dwSize := 0;
  repeat
    inc(dwSize);
  until PByte(Cardinal(pAddr)+dwSize-1)^ = $C3;
  Result := dwSize;
end;begin
  WriteResData(@FuncIn, SizeOfProc(@FuncIn), cFuncIn);
end.

Stub:


program Stub;{$APPTYPE CONSOLE}uses
  Windows;const
  cFuncIn : PWideChar = 'FUNCIN';type
  TGetProcAddress = function (hModule: Cardinal; lpProcName: pAnsiChar): Pointer; stdcall;
  TLoadLibraryA = function(lpLibFileName: PAnsiChar): Cardinal; stdcall;
  TFuncInRecord = Record
    xGetProcAddress : TGetProcAddress;
    xLoadLibraryA : TLoadLibraryA;
    gpUser32 : pAnsiChar;
    gpMessageBoxA : pAnsiChar;
    gpString : pAnsiChar;
  end;
  PFuncInRecord = ^TFuncInRecord;  TFuncIn = procedure(pData : PFuncInRecord; lpTitle, lpMessage : pAnsiChar);
  PFuncIn = ^TFuncIn;procedure ResGet(ResName: pwidechar; var data : pointer; var Size:dword);
var
  ResSrc: hRSrc;
  ResGlobal: hGlobal;
begin
  ResSrc := FindResourceW(hInstance, ResName, MakeIntResourceW(10));
  ResGlobal := LoadResource(hInstance, ResSrc);
  data := LockResource(ResGlobal);
  Size := SizeofResource(hInstance, ResSrc);
end;var
  FuncInCall: TFuncIn;
  FuncIn : PFuncIn;
  pResource : Pointer;
  dwResourceSize :dword;
  AFuncInRecord : TFuncInRecord;
begin
  AFuncInRecord.xGetProcAddress := @GetProcAddress;
  AFuncInRecord.xLoadLibraryA := @LoadLibraryA;
  AFuncInRecord.gpUser32 := 'user32.dll';
  AFuncInRecord.gpMessageBoxA := 'MessageBoxA';
  AFuncInRecord.gpString := 'Test';
  ResGet(cFuncIn, pResource, dwResourceSize);
  FuncIn := VirtualAlloc(nil, dwResourceSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
  CopyMemory(FuncIn, pResource, dwResourceSize);
  FuncInCall := TFuncIn(DWORD(FuncIn));
  FuncInCall(@AFuncInRecord,'Title','Caption');
  VirtualFree(FuncIn, 0, MEM_RELEASE);
end.

B)

counterstrikewi

counterstrikewi

Posted
  • Author
Posted

Updated:
/>http://www.delphibasics.info/home/delphibasicscounterstrikewireleases/func-indelphiexample

Builder:

program Builder;
//delphibasics.info & ic0de.org
//Authors: cswi, abhe & steve10120const
  kernel32 = 'kernel32.dll';
  MB_YESNO = 4;
  MB_OK = 0;type
  PByte = ^Byte;function BeginUpdateResourceW(pFileName: PWideChar; bDeleteExistingResources: Boolean): Cardinal; stdcall; external kernel32 name 'BeginUpdateResourceW';
function UpdateResourceW(hUpdate: Cardinal; lpType, lpName: PWideChar; wLanguage: Word; lpData: Pointer; cbData: LongWord): Boolean; stdcall; external kernel32 name 'UpdateResourceW';
function EndUpdateResourceW(hUpdate: Cardinal; fDiscard: Boolean): Boolean; stdcall; external kernel32 name 'EndUpdateResourceW';const
  cFuncIn : PWideChar = 'FUNCIN';type
  TGetProcAddress = function (hModule: Cardinal; lpProcName: pAnsiChar): Pointer; stdcall;
  TLoadLibraryA = function(lpLibFileName: PAnsiChar): Cardinal; stdcall;
  TFuncInRecord = Record
    xGetProcAddress : TGetProcAddress;
    xLoadLibraryA : TLoadLibraryA;
  end;
  PFuncInRecord = ^TFuncInRecord;procedure FuncIn(AFuncInRecord : PFuncInRecord; lpText, lpCaption : pAnsiChar);
type
  TMessageBoxA = function (hWnd: Cardinal; lpText, lpCaption: PAnsiChar; uType: LongWord): LongWord; stdcall;
var
  szUser32 : array[0..6] of AnsiChar;
  szMessageBoxA : array[0..11] of AnsiChar;
  xMessageBoxA : TMessageBoxA;
  dwResult : LongWord;
begin
  szUser32[0] := 'U';
  szUser32[1] := 's';
  szUser32[2] := 'e';
  szUser32[3] := 'r';
  szUser32[4] := '3';
  szUser32[5] := '2';
  szUser32[6] := #0;
  szMessageBoxA[0] := 'M';
  szMessageBoxA[1] := 'e';
  szMessageBoxA[2] := 's';
  szMessageBoxA[3] := 's';
  szMessageBoxA[4] := 'a';
  szMessageBoxA[5] := 'g';
  szMessageBoxA[6] := 'e';
  szMessageBoxA[7] := 'B';
  szMessageBoxA[8] := 'o';
  szMessageBoxA[9] := 'x';
  szMessageBoxA[10] := 'A';
  szMessageBoxA[11] := #0;
  with AFuncInRecord^ do
  begin
    @xMessageBoxA := xGetProcAddress(xLoadLibraryA(szUser32), szMessageBoxA);
    if Assigned(xMessageBoxA) then
    begin
      dwResult := xMessageBoxA(0, lpText, lpCaption, MB_YESNO);
      if dwResult = 6 then
        xMessageBoxA(0, lpText, lpCaption, MB_OK);
    end;
  end;
end;Function WriteResData(pFile: pointer; Size: integer; pwName: pWideChar):Boolean;
const
  pwServerFile : PWideChar = 'Stub.exe'  ;
var
  hResourceHandle: Cardinal;
begin
  hResourceHandle := BeginUpdateResourceW(pwServerFile, False);
  Result := UpdateResourceW(hResourceHandle, PWideChar(10), pwName, 0, pFile, Size);
  EndUpdateResourceW(hResourceHandle, False);
end;function SizeOfProc(pAddr: pointer): Cardinal;
var dwSize: Cardinal;
begin
  dwSize := 0;
  repeat
    inc(dwSize);
  until PByte(Cardinal(pAddr)+dwSize-1)^ = $C3;
  Result := dwSize;
end;begin
  WriteResData(@FuncIn, SizeOfProc(@FuncIn), cFuncIn);
  WriteResData(nil, 0, 'PACKAGEINFO');
  WriteResData(nil, 0, 'DVCLAL');
end.

Stub:


program Stub;const
  kernel32 = 'kernel32.dll';
  MEM_COMMIT = $1000;
  PAGE_EXECUTE_READWRITE = $40;
  MEM_RELEASE = $8000;function GetProcAddress(hModule: Cardinal; lpProcName: PAnsiChar): Pointer; stdcall; external kernel32 name 'GetProcAddress';
function LoadLibraryA(lpLibFileName: PAnsiChar): Cardinal; stdcall; external kernel32 name 'LoadLibraryA';
function FindResourceW(hModule: Cardinal; lpName, lpType: PWideChar): Cardinal; stdcall; external kernel32 name 'FindResourceW';
function LoadResource(hModule: Cardinal; hResInfo: Cardinal): Cardinal; stdcall; external kernel32 name 'LoadResource';
function SizeofResource(hModule: Cardinal; hResInfo: Cardinal): LongWord; stdcall; external kernel32 name 'SizeofResource';
function VirtualAlloc(lpvAddress: Pointer; dwSize, flAllocationType, flProtect: LongWord): Pointer; stdcall; external kernel32 name 'VirtualAlloc';
function VirtualFree(lpAddress: Pointer; dwSize, dwFreeType: LongWord): Boolean; stdcall; external kernel32 name 'VirtualFree';const
  cFuncIn : PWideChar = 'FUNCIN';type
  TGetProcAddress = function (hModule: Cardinal; lpProcName: pAnsiChar): Pointer; stdcall;
  TLoadLibraryA = function(lpLibFileName: PAnsiChar): Cardinal; stdcall;
  TFuncInRecord = Record
    xGetProcAddress : TGetProcAddress;
    xLoadLibraryA : TLoadLibraryA;
  end;
  PFuncInRecord = ^TFuncInRecord;  PFuncIn = ^TFuncIn;
  TFuncIn = procedure(pData : PFuncInRecord; lpTitle, lpMessage : pAnsiChar);procedure ResGet(ResName: pwidechar; var data : pointer; var Size:LongWord);
var
  ResSrc: Cardinal;
  ResGlobal: Cardinal;
begin
  ResSrc := FindResourceW(0, ResName, PWideChar(10));
  ResGlobal := LoadResource(0, ResSrc);
  Data := Pointer(ResGlobal);
  Size := SizeofResource(0, ResSrc);
end;procedure CopyMemory(Destination, Source:Pointer; dwSize:LongWord);
asm
  PUSH ECX
  PUSH ESI
  PUSH EDI
  MOV EDI, Destination
  MOV ESI, Source
  MOV ECX, dwSize
  REP MOVSB
  POP EDI
  POP ESI
  POP ECX
end;var
  FuncIn : TFuncIn;
  pResource : Pointer;
  dwResourceSize : LongWord;
  AFuncInRecord : TFuncInRecord;
begin
  AFuncInRecord.xGetProcAddress := @GetProcAddress;
  AFuncInRecord.xLoadLibraryA := @LoadLibraryA;
  ResGet(cFuncIn, pResource, dwResourceSize);
  FuncIn := VirtualAlloc(nil, dwResourceSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
  CopyMemory(@FuncIn, pResource, dwResourceSize);
  FuncIn(@AFuncInRecord,'cswi <3 abhe & steve10120', '<3 p0ke');
  VirtualFree(@FuncIn, 0, MEM_RELEASE);
end.

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