写一个DLL监视自己进程文件读写操作用OutputdebugstringA调试输出

以下是一个简单的DLL代码示例，它可以监视自己的进程文件读写操作，使用OutputDebugStringA调试输出。该DLL可以被注入到目标进程中，以便监视其文件读写操作。请注意，这只是一个示例，实际应用中可能需要更复杂的代码来实现更全面的监视。

#include <Windows.h>

BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        // 当该DLL被注入到进程中时，开始监视文件读写操作
        OutputDebugStringA("DLL_PROCESS_ATTACH\n");
        HookFileIO();
        break;

    case DLL_PROCESS_DETACH:
        OutputDebugStringA("DLL_PROCESS_DETACH\n");
        break;
    }
    return TRUE;
}

void HookFileIO()
{
    // 获取当前进程句柄
    HANDLE hProcess = GetCurrentProcess();

    // 获取NtCreateFile函数地址
    HMODULE hModule = GetModuleHandleA("ntdll.dll");
    FARPROC pfnNtCreateFile = GetProcAddress(hModule, "NtCreateFile");

    // 替换NtCreateFile函数地址
    DWORD dwOldProtect;
    VirtualProtect(pfnNtCreateFile, sizeof(DWORD), PAGE_EXECUTE_READWRITE, &dwOldProtect);
    DWORD dwNewAddress = (DWORD)&MyNtCreateFile;
    memcpy(pfnNtCreateFile, &dwNewAddress, sizeof(DWORD));
    VirtualProtect(pfnNtCreateFile, sizeof(DWORD), dwOldProtect, &dwOldProtect);
}

NTSTATUS NTAPI MyNtCreateFile(
    PHANDLE             FileHandle,
    ACCESS_MASK         DesiredAccess,
    POBJECT_ATTRIBUTES  ObjectAttributes,
    PIO_STATUS_BLOCK    IoStatusBlock,
    PLARGE_INTEGER      AllocationSize,
    ULONG               FileAttributes,
    ULONG               ShareAccess,
    ULONG               CreateDisposition,
    ULONG               CreateOptions,
    PVOID               EaBuffer,
    ULONG               EaLength
)
{
    // 调用原始的NtCreateFile函数
    NTSTATUS status = ((NTSTATUS(NTAPI*)(PHANDLE, ACCESS_MASK, POBJECT_ATTRIBUTES, PIO_STATUS_BLOCK, PLARGE_INTEGER, ULONG, ULONG, ULONG, ULONG, PVOID, ULONG))
        GetProcAddress(GetModuleHandleA("ntdll.dll"), "NtCreateFile"))
        (FileHandle, DesiredAccess, ObjectAttributes, IoStatusBlock, AllocationSize, FileAttributes, ShareAccess, CreateDisposition, CreateOptions, EaBuffer, EaLength);

    // 判断文件读写操作类型
    if (CreateDisposition == FILE_OPEN || CreateDisposition == FILE_OVERWRITE || CreateDisposition == FILE_SUPERSEDE) {
        // 文件读取操作
        OutputDebugStringA("File read operation detected!\n");
    }
    else if (CreateDisposition == FILE_CREATE || CreateDisposition == FILE_OPEN_IF) {
        // 文件写入操作
        OutputDebugStringA("File write operation detected!\n");
    }

    return status;
}