API HOOK库
API HOOK有两种做法,一种是SetWindowHookEx,简单易用,但如果做其它的HOOK,如HOOK OpenProcess,就需要修改内存地址了,内存地址可以通过WriteProcessMemory来修改,先将调用函数的地址改成自己的(jmp到自己的函数),然后需要时,再改回来。
#pragma once
#ifdef _M_IX86
template <typename T>
class Hooker
{
protected:
static DWORD HookFunction(LPCWSTR lpModule, LPCSTR lpFuncName, PROC lpFunction)
{
DWORD dwAddr = (DWORD) GetProcAddress(GetModuleHandle(lpModule), lpFuncName);
BYTE jmp [] =
{
0xe9, //jmp
0x00, 0x00, 0x00, 0x00, //address
0xc3 //retn
};
ReadProcessMemory(GetCurrentProcess(), (LPVOID) dwAddr, MemoryAddress(), 6, 0);
DWORD dwCalc = ((DWORD) lpFunction - dwAddr - 5); //((to)-(from)-5)
memcpy(&jmp[1], &dwCalc, 4); //build the jmp
WriteProcessMemory(GetCurrentProcess(), (LPVOID) dwAddr, jmp, 6, 0);
return dwAddr;
}
static BOOL UnHookFunction(LPCWSTR lpModule, LPCSTR lpFuncName)
{
DWORD dwAddr = (DWORD) GetProcAddress(GetModuleHandle(lpModule), lpFuncName);
if (WriteProcessMemory(GetCurrentProcess(), (LPVOID) dwAddr, MemoryAddress(), 6, 0))
return TRUE;
return FALSE;
}
static BYTE* MemoryAddress()
{
static BYTE backup[6];
return backup;
}
};
#elif _M_AMD64
template <typename T>
class Hooker
{
protected:
static UINT64 HookFunction(LPCWSTR lpModule, LPCSTR lpFuncName, LPVOID lpFunction)
{
UINT64 dwAddr = (UINT64) GetProcAddress(GetModuleHandle(lpModule), lpFuncName);
BYTE jmp [] =
{
0x48, 0xb8, //jmp
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, //address
0x50, 0xc3 //retn
};
ReadProcessMemory(GetCurrentProcess(), (LPVOID) dwAddr, MemoryAddress(), 12, 0);
UINT64 dwCalc = (UINT64) lpFunction;
memcpy(&jmp[2], &dwCalc, 8); //build the jmp
WriteProcessMemory(GetCurrentProcess(), (LPVOID) dwAddr, jmp, 12, nullptr);
return dwAddr;
}
static BOOL UnHookFunction(LPCWSTR lpModule, LPCSTR lpFuncName)
{
UINT64 dwAddr = (UINT64) GetProcAddress(GetModuleHandle(lpModule), lpFuncName);
if (WriteProcessMemory(GetCurrentProcess(), (LPVOID) dwAddr, MemoryAddress(), 12, 0))
return TRUE;
return FALSE;
}
static BYTE* MemoryAddress()
{
static BYTE backup[12];
return backup;
}
};
#endif
值得注意的是,64位和32位的注入字节有些许不同。
由于目前Visual Studio 2013 Preview实现的C++类中,还是不允许有非int静态变量,但却允许函数中有静态变量,所以我将目标指针数据备份到静态成员中:
static BYTE* MemoryAddress() { static BYTE backup[6]; return backup; }
然后,在使用时,从Hooker继承一个类即可:
class MessageBoxHooker : Hooker<MessageBoxHooker>
{
public:
static void BeginHook()
{
HookFunction(L"user32.dll", "MessageBoxW", (PROC) MyMessageBoxW);
}
static void StopHook()
{
UnHookFunction(L"user32.dll", "MessageBoxW");
}
private:
static int WINAPI MyMessageBoxW(HWND hWnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType)
{
StopHook();
int x = MessageBox(hWnd, L"hooked", lpCaption, uType);
BeginHook();
return x;
}
};
要开启Hook,只需调用:
MessageBoxHooker::BeginHook();
这个API HOOK库我使了一个模板,之所以用模板是因为C++函数指针不包含实例的指针。这种使用模板来解决C++指针的缺点的做法很常见,ATL也是这样实现的。
本文提供的代码可以随意引用,但请充分测试后再部署,出问题本人不承担任何责任,欢迎有任何建议和补充~