RenHook

An open-source x86 / x86-64 hooking library for Windows.

Features

• Supports x86 and x86-64 (uses Zydis as diassembler)
• Completely written in C++11
• Safe and easy to use
• Hooking methods
  • Inline hook - Patches the prologue of a function to redirect its code flow, also allocates a trampoline to that can be used to execute the original function.

Quick examples

Hooking by address

#include <Windows.h>
#include <renhook/renhook.hpp>

void func_detour();

using func_t = void(*)();
renhook::inline_hook<func_t> func_hook(0x14000000, &func_detour);

void func_detour()
{
    OutputDebugStringA("Hello from the hook!\n");
    func_hook();
}

int APIENTRY wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nCmdShow)
{
    func_hook.attach();
    func_hook();
    func_hook.detach();

    func_hook();
    return 0;
}

Hooking by pattern

#include <Windows.h>
#include <renhook/renhook.hpp>

void func_detour();

using func_t = void(*)();
renhook::inline_hook<func_t> func_hook({ 0x89, 0x79, 0xF8, 0xE8, 0xCC, 0xCC, 0xCC, 0xCC, 0x8B, 0x0D, 0xCC, 0xCC, 0xCC, 0xCC }, &func_detour, 0xCC, 3);

void func_detour()
{
    OutputDebugStringA("Hello from the hook!\n");
    func_hook();
}

int APIENTRY wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nCmdShow)
{
    func_hook.attach();
    func_hook();
    func_hook.detach();

    func_hook();
    return 0;
}

Hooking a function from a module

#include <Windows.h>
#include <renhook/renhook.hpp>

int WINAPI msgbox_detour(HWND wnd, LPCWSTR text, LPCWSTR caption, UINT type);

using MessageBoxW_t = int(WINAPI*)(HWND, LPCWSTR, LPCWSTR, UINT);
renhook::inline_hook<MessageBoxW_t> msgbox_hook("user32", "MessageBoxW", &msgbox_detour);

int WINAPI msgbox_detour(HWND wnd, LPCWSTR text, LPCWSTR caption, UINT type)
{
    return msgbox_hook(wnd, L"Hello from the hook!", L"RenHook", MB_OK | MB_ICONINFORMATION);
}

int APIENTRY wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nCmdShow)
{
    msgbox_hook.attach();
    MessageBoxW(nullptr, L"Hello", L"Message", MB_OK);
    msgbox_hook.detach();

    MessageBoxW(nullptr, L"Hello", L"Message", MB_OK);
    return 0;
}

Build instructions

Requirements

• CMake 3.8+.

Windows

1. Download and install Visual Studio 2019 Community Edition or a higher version.
2. Download and install the Requirements.
3. Clone this repository.
4. Clone the dependencies (git submodule update --init --recursive).
5. Create a directory named build and run CMake in it.
6. Open the solution (RenHook.sln) located in build directory.
7. Build the projects.