Windows 驅動開發庫裡面提供了函數 LdrRegisterDllNotification , LdrUnregisterDllNotification , 可以讓你監視程序裝載/解除安裝DLL 的事件。 當你想在某個DLL被加載的時候Hook它的函數; 或者當你想在某個DLL推出之前做一些儲存清理工作; 或者當你想阻止某個DLL 被加載(比如外挂) .... 這個機制正可以派上用場 。
以下是代碼示例如何使用 LdrRegisterDllNotification , LdrUnregisterDllNotification 監聽DLL裝載/解除安裝。
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#include <Ntsecapi.h> // DDK
typedef const UNICODE_STRING* PCUNICODE_STRING;
typedef struct _LDR_DLL_LOADED_NOTIFICATION_DATA {
ULONG Flags; //Reserved.
PCUNICODE_STRING FullDllName; //The full path name of the DLL module.
PCUNICODE_STRING BaseDllName; //The base file name of the DLL module.
PVOID DllBase; //A pointer to the base address for the DLL in memory.
ULONG SizeOfImage; //The size of the DLL image, in bytes.
} LDR_DLL_LOADED_NOTIFICATION_DATA, *PLDR_DLL_LOADED_NOTIFICATION_DATA;
typedef struct _LDR_DLL_UNLOADED_NOTIFICATION_DATA {
} LDR_DLL_UNLOADED_NOTIFICATION_DATA, *PLDR_DLL_UNLOADED_NOTIFICATION_DATA;
typedef union _LDR_DLL_NOTIFICATION_DATA {
LDR_DLL_LOADED_NOTIFICATION_DATA Loaded;
LDR_DLL_UNLOADED_NOTIFICATION_DATA Unloaded;
} LDR_DLL_NOTIFICATION_DATA, *PLDR_DLL_NOTIFICATION_DATA;
typedef const PLDR_DLL_NOTIFICATION_DATA PCLDR_DLL_NOTIFICATION_DATA;
typedef VOID (NTAPI *PLDR_DLL_NOTIFICATION_FUNCTION)(ULONG NotificationReason, PCLDR_DLL_NOTIFICATION_DATA NotificationData, PVOID Context);
typedef NTSTATUS (NTAPI *pfnLdrRegisterDllNotification)(ULONG Flags, PLDR_DLL_NOTIFICATION_FUNCTION NotificationFunction, void* Context, void **Cookie);
typedef NTSTATUS (NTAPI *pfnLdrUnregisterDllNotification)(void *Cookie);
#define LDR_DLL_NOTIFICATION_REASON_LOADED 1
#define LDR_DLL_NOTIFICATION_REASON_UNLOADED 2
VOID NTAPI MyLdrDllNotification(
ULONG NotificationReason,
PCLDR_DLL_NOTIFICATION_DATA NotificationData,
PVOID Context
)
{
switch (NotificationReason)
{
case LDR_DLL_NOTIFICATION_REASON_LOADED:
printf ("Dll Loaded: %S\n", NotificationData->Loaded.FullDllName->Buffer);
break;
case LDR_DLL_NOTIFICATION_REASON_UNLOADED:
printf ("Dll Unloaded: %S\n", NotificationData->Unloaded.FullDllName->Buffer);
}
}
int _tmain(int argc, _TCHAR* argv[])
HMODULE hModule = GetModuleHandleW(L"NTDLL.DLL");
// 取得函數指針
pfnLdrRegisterDllNotification pLdrRegisterDllNotification = (pfnLdrRegisterDllNotification)GetProcAddress(hModule, "LdrRegisterDllNotification");
pfnLdrUnregisterDllNotification pLdrUnregisterDllNotification = (pfnLdrUnregisterDllNotification)GetProcAddress(hModule, "LdrUnregisterDllNotification");
void *pvCookie = NULL;
// 初始化
pLdrRegisterDllNotification(0, MyLdrDllNotification, NULL, &pvCookie);
// 測試DLL 裝載
HMODULE hLoad = ::LoadLibraryW(L"mshtml.dll");
Sleep(1000);
// 測試 DLL 解除安裝
::FreeLibrary(hLoad);
// 清除
if (pvCookie)
pLdrUnregisterDllNotification(pvCookie);
pvCookie = NULL;
return 0;
}
#include <Ntsecapi.h> // DDK
typedef const UNICODE_STRING* PCUNICODE_STRING;
typedef struct _LDR_DLL_LOADED_NOTIFICATION_DATA {
ULONG Flags; //Reserved.
PCUNICODE_STRING FullDllName; //The full path name of the DLL module.
PCUNICODE_STRING BaseDllName; //The base file name of the DLL module.
PVOID DllBase; //A pointer to the base address for the DLL in memory.
ULONG SizeOfImage; //The size of the DLL image, in bytes.
} LDR_DLL_LOADED_NOTIFICATION_DATA, *PLDR_DLL_LOADED_NOTIFICATION_DATA;
typedef struct _LDR_DLL_UNLOADED_NOTIFICATION_DATA {
} LDR_DLL_UNLOADED_NOTIFICATION_DATA, *PLDR_DLL_UNLOADED_NOTIFICATION_DATA;
typedef union _LDR_DLL_NOTIFICATION_DATA {
LDR_DLL_LOADED_NOTIFICATION_DATA Loaded;
LDR_DLL_UNLOADED_NOTIFICATION_DATA Unloaded;
} LDR_DLL_NOTIFICATION_DATA, *PLDR_DLL_NOTIFICATION_DATA;
typedef const PLDR_DLL_NOTIFICATION_DATA PCLDR_DLL_NOTIFICATION_DATA;
typedef VOID (NTAPI *PLDR_DLL_NOTIFICATION_FUNCTION)(ULONG NotificationReason, PCLDR_DLL_NOTIFICATION_DATA NotificationData, PVOID Context);
typedef NTSTATUS (NTAPI *pfnLdrRegisterDllNotification)(ULONG Flags, PLDR_DLL_NOTIFICATION_FUNCTION NotificationFunction, void* Context, void **Cookie);
typedef NTSTATUS (NTAPI *pfnLdrUnregisterDllNotification)(void *Cookie);
#define LDR_DLL_NOTIFICATION_REASON_LOADED 1
#define LDR_DLL_NOTIFICATION_REASON_UNLOADED 2
VOID NTAPI MyLdrDllNotification(
ULONG NotificationReason,
PCLDR_DLL_NOTIFICATION_DATA NotificationData,
PVOID Context
)
{
switch (NotificationReason)
{
case LDR_DLL_NOTIFICATION_REASON_LOADED:
printf ("Dll Loaded: %S\n", NotificationData->Loaded.FullDllName->Buffer);
break;
case LDR_DLL_NOTIFICATION_REASON_UNLOADED:
printf ("Dll Unloaded: %S\n", NotificationData->Unloaded.FullDllName->Buffer);
}
}
int _tmain(int argc, _TCHAR* argv[])
HMODULE hModule = GetModuleHandleW(L"NTDLL.DLL");
// 取得函數指針
pfnLdrRegisterDllNotification pLdrRegisterDllNotification = (pfnLdrRegisterDllNotification)GetProcAddress(hModule, "LdrRegisterDllNotification");
pfnLdrUnregisterDllNotification pLdrUnregisterDllNotification = (pfnLdrUnregisterDllNotification)GetProcAddress(hModule, "LdrUnregisterDllNotification");
void *pvCookie = NULL;
// 初始化
pLdrRegisterDllNotification(0, MyLdrDllNotification, NULL, &pvCookie);
// 測試DLL 裝載
HMODULE hLoad = ::LoadLibraryW(L"mshtml.dll");
Sleep(1000);
// 測試 DLL 解除安裝
::FreeLibrary(hLoad);
// 清除
if (pvCookie)
pLdrUnregisterDllNotification(pvCookie);
pvCookie = NULL;
return 0;
運作程式, 輸出如下。可以證明以上代碼監聽了 mshtml.dll 的裝載和解除安裝。 而且系統自動裝載的其他DLL也被監視到。
Dll Loaded: C:\Windows\system32\mshtml.dll
Dll Loaded: C:\Windows\system32\msls31.dll
Dll Loaded: C:\Windows\system32\VERSION.dll
Dll Unloaded: C:\Windows\system32\mshtml.dll
Dll Unloaded: C:\Windows\system32\VERSION.dll
Dll Unloaded: C:\Windows\system32\msls31.dll
本文轉自 陳本峰 51CTO部落格,原文連結:http://blog.51cto.com/wingeek/274017,如需轉載請自行聯系原作者