// dllmain.cpp : 定义 DLL 应用程序的入口点。
#include "stdafx.h"
#include "easyhook.h"
#include "DriverShared.h"

#ifndef _WIN64
#pragma comment(lib, "EasyHookLib.lib")
#else
#pragma comment(lib, "EasyHookLib64.lib")
#endif

EXTERN_C BOOL APIENTRY EASYHOOK_DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved);

typedef HANDLE(WINAPI *pfnCREATEFILEA)(
	__in     LPCSTR lpFileName,
	__in     DWORD dwDesiredAccess,
	__in     DWORD dwShareMode,
	__in_opt LPSECURITY_ATTRIBUTES lpSecurityAttributes,
	__in     DWORD dwCreationDisposition,
	__in     DWORD dwFlagsAndAttributes,
	__in_opt HANDLE hTemplateFile
	);

typedef HANDLE(WINAPI *pfnCREATEFILEW)(
	__in     LPCWSTR lpFileName,
	__in     DWORD dwDesiredAccess,
	__in     DWORD dwShareMode,
	__in_opt LPSECURITY_ATTRIBUTES lpSecurityAttributes,
	__in     DWORD dwCreationDisposition,
	__in     DWORD dwFlagsAndAttributes,
	__in_opt HANDLE hTemplateFile
	);

HMODULE                 hKernel32 = LoadLibraryA("Kernel32.dll");
TRACED_HOOK_HANDLE      hCreateFileA = new HOOK_TRACE_INFO();
TRACED_HOOK_HANDLE      hCreateFileW = new HOOK_TRACE_INFO();
NTSTATUS                NtStatus;

ULONG                   ACLEntries[1] = { 0 };
ULONG                   HookCreateFileA_ACLEntries[1] = { 0 };
ULONG                   HookCreateFileW_ACLEntries[1] = { 0 };

UNICODE_STRING*         NameBuffer = NULL;
pfnCREATEFILEA			pfnCreateFileA = NULL;
pfnCREATEFILEW			pfnCreateFileW = NULL;

HANDLE WINAPI CreateFileAHook(
	__in     LPCSTR lpFileName,
	__in     DWORD dwDesiredAccess,
	__in     DWORD dwShareMode,
	__in_opt LPSECURITY_ATTRIBUTES lpSecurityAttributes,
	__in     DWORD dwCreationDisposition,
	__in     DWORD dwFlagsAndAttributes,
	__in_opt HANDLE hTemplateFile
)
{
	HANDLE hHandle = NULL;
	DWORD dwError = 0;

	// 执行钩子  
	if (pfnCreateFileA == NULL)
	{
		OutputDebugString(L"pfnCreateFileA is NULL\n");
		return INVALID_HANDLE_VALUE;
	}
	else
	{
		hHandle = (pfnCREATEFILEA)(lpFileName, dwDesiredAccess, dwShareMode,
			lpSecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
		dwError = GetLastError();

		CString csOutput;
		csOutput.Format(_T("CreateFileAHook lpFileName = %s, dwCreationDisposition = 0x%08X"),
			lpFileName, dwCreationDisposition);
		OutputDebugString(csOutput);
	}

	return hHandle;
}

HANDLE WINAPI CreateFileWHook(
	__in     LPCWSTR lpFileName,
	__in     DWORD dwDesiredAccess,
	__in     DWORD dwShareMode,
	__in_opt LPSECURITY_ATTRIBUTES lpSecurityAttributes,
	__in     DWORD dwCreationDisposition,
	__in     DWORD dwFlagsAndAttributes,
	__in_opt HANDLE hTemplateFile)
{
	HANDLE hHandle = NULL;
	DWORD dwError = 0;

	if (pfnCreateFileW == NULL)
	{
		OutputDebugString(_T("pfnCreateFileW is NULL\n"));
		return INVALID_HANDLE_VALUE;
	}
	else
	{
		hHandle = (pfnCREATEFILEW)(lpFileName, dwDesiredAccess, dwShareMode,
			lpSecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
		dwError = GetLastError();

		CString csOutput;
		csOutput.Format(_T("CreateFileWHook lpFileName = %s, dwCreationDisposition = 0x%08X"), 
			lpFileName, dwCreationDisposition);
		OutputDebugString(csOutput);
	}

	return hHandle;
}

BOOL InstallHook()
{
	TCHAR szCurrentProcessName[MAX_PATH] = { 0 };
	GetModuleFileName(NULL, szCurrentProcessName, _countof(szCurrentProcessName));
	OutputDebugString(szCurrentProcessName);

	pfnCreateFileA = (pfnCREATEFILEA)GetProcAddress(hKernel32, "CreateFileA");
	NtStatus = LhInstallHook(pfnCreateFileA, CreateFileAHook, NULL, hCreateFileA);
	if (!SUCCEEDED(NtStatus))
	{
		OutputDebugString(_T("LhInstallHook failed..."));
		return FALSE;
	}

	NtStatus = LhSetInclusiveACL(HookCreateFileA_ACLEntries, 1, hCreateFileA);
	if (!SUCCEEDED(NtStatus))
	{
		OutputDebugString(_T("LhSetInclusiveACL failed..."));
		LhUninstallAllHooks();
		LhUninstallHook(hCreateFileA);
		return FALSE;
	}

	pfnCreateFileW = (pfnCREATEFILEW)GetProcAddress(hKernel32, "CreateFileW");
	if (NULL == pfnCreateFileW)
	{
		OutputDebugString(_T("pfnCreateFileW is NULL"));
	}
	NtStatus = LhInstallHook(pfnCreateFileW, CreateFileWHook, NULL, hCreateFileW);
	if (!SUCCEEDED(NtStatus))
	{
		OutputDebugString(_T("LhInstallHook CreateFileWHook failed..."));
		return FALSE;
	}

	NtStatus = LhSetInclusiveACL(HookCreateFileW_ACLEntries, 1, hCreateFileW);
	if (!SUCCEEDED(NtStatus))
	{
		OutputDebugString(_T("LhSetInclusiveACL CreateFileWHook failed..."));
		LhUninstallAllHooks();
		LhUninstallHook(hCreateFileW);
		return FALSE;
	}

	HANDLE hOpenFile = (HANDLE)CreateFile(PathFindFileName(szCurrentProcessName), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);
	if (hOpenFile == INVALID_HANDLE_VALUE)
	{
		hOpenFile = NULL;
	}

	return TRUE;
}

BOOL UninstallHook()
{
	LhUninstallAllHooks();

	if (NULL != hCreateFileA)
	{
		LhUninstallHook(hCreateFileA);
		delete hCreateFileA;
		hCreateFileA = NULL;
	}

	if (NULL != hCreateFileW)
	{
		LhUninstallHook(hCreateFileW);
		delete hCreateFileW;
		hCreateFileW = NULL;
	}

	LhWaitForPendingRemovals();
	return TRUE;
}

DWORD WINAPI HookThreadProc(LPVOID lpParamter)
{
	InstallHook();

	return 0;
}

void StartHookThread()
{
	DWORD dwThreadID = 0;
	HANDLE hThread = CreateThread(NULL, 0, HookThreadProc, NULL, 0, &dwThreadID);
	CloseHandle(hThread);
}

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		{
			OutputDebugString(_T("DLL_PROCESS_ATTACH"));
			EASYHOOK_DllMain(hModule, ul_reason_for_call, lpReserved);
			StartHookThread();
		}
		break;
	case DLL_THREAD_ATTACH:
		{
			EASYHOOK_DllMain(hModule, ul_reason_for_call, lpReserved);
		}
		break;
	case DLL_THREAD_DETACH:
		{
			EASYHOOK_DllMain(hModule, ul_reason_for_call, lpReserved);
		}
		break;
	case DLL_PROCESS_DETACH:
		{
			OutputDebugString(_T("DLL_PROCESS_DETACH"));
			UninstallHook();
			EASYHOOK_DllMain(hModule, ul_reason_for_call, lpReserved);
		}
		break;
	}
	return TRUE;
}

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