c++ - 弯路 Hook : GetVolumeInformation Random Volume Serial

Question

我正在尝试使用 Detours Express (3.0) Hook GetVolumeInformation，以更改音量序列。 问题是每次调用 Hook 函数时，它都会返回一个随机卷序列。

#include <fstream>
#include <string>
#include <windows.h>
#include <detours.h>
#include <fcntl.h>
#include <stdio.h>
#include <io.h>
#pragma comment(lib,"detours.lib")
#pragma comment(lib,"ws2_32.lib")
std::string rcvBuf;

HANDLE CreateConsole();

HANDLE CreateConsole()
{
    int hConHandle = 0;
    HANDLE lStdHandle = 0;
    FILE *fp = 0;

    // Allocate a console
    AllocConsole();

    // redirect unbuffered STDOUT to the console
    lStdHandle = GetStdHandle(STD_OUTPUT_HANDLE);
    hConHandle = _open_osfhandle(PtrToUlong(lStdHandle), _O_TEXT);
    fp = _fdopen(hConHandle, "w");
    *stdout = *fp;
    setvbuf(stdout, NULL, _IONBF, 0);

    return lStdHandle;
}

HMODULE hLib = GetModuleHandle("Kernel32.dll");
typedef BOOL (WINAPI *HWIDPtr)(LPCTSTR lpRootPathName, LPTSTR lpVolumeNameBuffer, DWORD nVolumeNameSize, LPDWORD &lpVolumeSerialNumber, LPDWORD lpMaximumComponentLength, LPDWORD lpFileSystemFlags, LPTSTR lpFileSystemNameBuffer, DWORD nFileSystemNameSize);
HWIDPtr pHWID = (HWIDPtr)GetProcAddress(hLib, "GetVolumeInformationW");

BOOL WINAPI MyHWID(LPCTSTR lpRootPathName, LPTSTR lpVolumeNameBuffer, DWORD nVolumeNameSize, LPDWORD lpVolumeSerialNumber, LPDWORD lpMaximumComponentLength, LPDWORD lpFileSystemFlags, LPTSTR lpFileSystemNameBuffer, DWORD nFileSystemNameSize)
{
    printf( ("Real : %u"),&lpVolumeSerialNumber);
    return pHWID(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize);
}

BOOL WINAPI DllMain(HINSTANCE hinst, DWORD dwReason, LPVOID reserved)
{

if (DetourIsHelperProcess()) {
    return TRUE;
}

if (dwReason == DLL_PROCESS_ATTACH) {

    CreateConsole();
    DetourRestoreAfterWith();

    DetourTransactionBegin();
    DetourUpdateThread(GetCurrentThread());
    DetourAttach(&(PVOID&)pHWID, MyHWID);
    if(DetourTransactionCommit() == NO_ERROR)
               printf("Attached successfuly!@");
}
else if (dwReason == DLL_PROCESS_DETACH) {

    DetourTransactionBegin();
    DetourUpdateThread(GetCurrentThread());
    DetourDetach(&(PVOID&)pHWID, MyHWID);
    DetourTransactionCommit();
}
return TRUE;
}

如有任何建议，我们将不胜感激。

Answer 1

如果您指的是钩子(Hook)函数内部的 printf() 调用会输出随机垃圾这一事实 - 这是完全合理的，因为 lpVolumeSerialNumber 是一个输出参数，因此它可能(而且很可能会)在原始函数调用。如果你想看到原始函数返回的值，你应该按以下方式重写你的钩子(Hook)函数:

BOOL WINAPI MyHWID(LPCTSTR lpRootPathName, LPTSTR lpVolumeNameBuffer, DWORD nVolumeNameSize, LPDWORD lpVolumeSerialNumber, LPDWORD lpMaximumComponentLength, LPDWORD lpFileSystemFlags, LPTSTR lpFileSystemNameBuffer, DWORD nFileSystemNameSize)
{
    BOOL retval = pHWID(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize);
    printf( ("Real : %u"), *lpVolumeSerialNumber);
    return retval;
}

请注意，我还将“&”更改为“*” - 如果您想取消引用指针而不是获取其地址，则应该使用这种方法。

希望对你有帮助