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Src/cstHook.cpp -見せられないよ! Ver.1.00- - Frost Moon Project アクセスランキング

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cstHook.cpp
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//Hook.cpp
 
//######################################################
//
//                 見せられないよ!
//                Ver.1.00 by x@rgs
//
//#####################################################
 
#define STRICT
#define UNICODE
#define _UNICODE
 
#include<tchar.h>
#include<windows.h>
#include<imagehlp.h>
 
void replaceAddress(PCSTR callee_mod_name,PROC current_pfn,PROC new_pfn,HMODULE mod_caller){
    //モジュールのインポートセクションのアドレスを取得する
    ULONG data_size;
 
    PIMAGE_IMPORT_DESCRIPTOR import_descriptor=NULL;
    import_descriptor=static_cast<PIMAGE_IMPORT_DESCRIPTOR>(::ImageDirectoryEntryToData(mod_caller,
                                                                                   true,
                                                                                   IMAGE_DIRECTORY_ENTRY_IMPORT,
                                                                                   &data_size));
 
    if(import_descriptor==NULL){
        //このモジュールにはインポートセクションがない
        //もしくは現在ロードされていない
        return;
    }
 
    //呼び出し先の関数への参照が含まれているインポート記述子を検索する
    for(;import_descriptor->Name;import_descriptor++){
        PSTR mod_name=reinterpret_cast<PSTR>(reinterpret_cast<PBYTE>(mod_caller)+import_descriptor->Name);
 
        if(lstrcmpiA(mod_name,callee_mod_name)==0){
            //呼び出し元のIATで呼び出し先関数を取得する
            PIMAGE_THUNK_DATA thunk_data=reinterpret_cast<PIMAGE_THUNK_DATA>(reinterpret_cast<PBYTE>(mod_caller)+import_descriptor->FirstThunk);
 
            //現在の関数アドレスを新しい関数アドレスと置き換える
            for(;thunk_data->u1.Function;thunk_data++){
                //関数アドレスのアドレスを取得する
                PROC* ppfn=reinterpret_cast<PROC*>(&thunk_data->u1.Function);
                DWORD protect_bak=0;
 
                if(*ppfn!=current_pfn)continue;
 
                //保護状態変更
                if(!VirtualProtect(ppfn,sizeof(PROC),PAGE_READWRITE,&protect_bak)){
                    return;
                }
                ::WriteProcessMemory(::GetCurrentProcess(),ppfn,&new_pfn,sizeof(new_pfn),NULL);
                //保護状態を元に戻す
                ::VirtualProtect(ppfn,sizeof(PROC),protect_bak,&protect_bak);
                return;
            }
        }
    }
}
 
namespace hook{
    typedef BOOL (WINAPI*pShowWindow)(HWND hWnd,int nCmdShow);
    pShowWindow org_pShowWindow;
 
    BOOL WINAPI showWindow(HWND hWnd,int nCmdShow){
        int state=nCmdShow;
 
        if(state==SW_SHOWNORMAL||
            state==SW_SHOW)state=SW_HIDE;
 
        return org_pShowWindow(hWnd,state);
    }
 
    void installHook(){
        org_pShowWindow=(pShowWindow)::GetProcAddress(::GetModuleHandleA("user32"),"ShowWindow");
        replaceAddress("user32.dll",
                       reinterpret_cast<PROC>(org_pShowWindow),
                       reinterpret_cast<PROC>(showWindow),
                       ::GetModuleHandle(NULL));
    }
 
    void uninstallHook(){
        replaceAddress("user32.dll",
                       reinterpret_cast<PROC>(showWindow),
                       reinterpret_cast<PROC>(org_pShowWindow),
                       ::GetModuleHandle(NULL));
    }
}
 
//extern "C"必須
extern "C" BOOL WINAPI DllMainCRTStartup(HINSTANCE instance_handle,DWORD reason,LPVOID reserved){
    switch(reason){
        case DLL_PROCESS_ATTACH:
            // attach to process
            // return FALSE to fail DLL load
            //DLL_THREAD_ATTACHとDLL_THREAD_DETACHを無効にする
            ::DisableThreadLibraryCalls(instance_handle);
 
            hook::installHook();
            break;
 
        case DLL_PROCESS_DETACH:
            // detach from process
            hook::uninstallHook();
            break;
 
        case DLL_THREAD_ATTACH:
            // attach to thread
            break;
 
        case DLL_THREAD_DETACH:
            // detach from thread
            break;
    }
    return TRUE;// succesful
}
        


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