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detours in pascal

 
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rovnix
Newbie cheater
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Joined: 09 Feb 2014
Posts: 18
PostPosted: Tue Jun 09, 2015 11:13 am    Post subject: detours in pascal Reply with quote
Good evening people

Recently I been doing some game hacking, hooking and some other stuff again, but api hooking a hasn't been fun with me

Someone made this api hook detour function in delphi, (lazarus) tested with a simple messagebox hook, doesn't even work as I expected. Hence I decided to come on here to seek help.

Please do help me in your own small way people

Code:

function DetourFunction (src, dst: Pointer; len: Integer): Pointer;
var
  jmp     : PByteArray;
  dwBack  : LongWord;
  jmpaddr : PtrUInt;
  srcarr  : PByteArray;
  i       : Integer;
begin
  srcarr := PByteArray(src);
  GetMem(jmp, len + 5);
  VirtualProtect(src, len, PAGE_EXECUTE_READWRITE, @dwBack);
  Move(src^, jmp^, len);
  jmp^[len]:=$e9;

  jmpaddr:=PtrUInt(@jmp^[len]);
  PPtrUInt( @jmp^[len+1])^ := PtrUInt(src)+PtrUInt(len) - jmpaddr - 5;

  srcarr^[0]:=$e9;
  PPtrUInt( @srcarr^[1] )^ := PtrUInt(dst) - PtrUInt(src) - 5;

  for i:=5 to len-1 do srcarr^[i]:=$90;

  VirtualProtect(src, len, dwBack, @dwBack);
  Result:=jmp;
end;


Hence it doesn't work as I expected, am quite still new to this as I don't have anyone to give me instructions here. Pls help.
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Dark Byte
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Joined: 09 May 2003
Posts: 25791
Location: The netherlands
PostPosted: Fri Jun 12, 2015 2:05 am    Post subject: Reply with quote
is this code inside an injected dll in the target process? if not, this won't work
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