Hooks.cpp

Go to the documentation of this file.

#include "Hooks.h"
 
#include <string>
 
#include <Logger/Logger.h>
 
#include "Offsets.h"
#include "IBaseApi.h"
#include "detours/detours.h"
 
namespace API
{
    Hooks::Hooks()
    {
        //No Longer Required.
    }
 
    bool Hooks::SetHookInternal(const std::string& func_name, LPVOID detour, LPVOID* original)
    {
        LPVOID target = Offsets::Get().GetAddress(func_name);
        if (target == nullptr)
        {
            Log::GetLog()->error("{} does not exist", func_name);
            return false;
        }
 
        auto& hook_vector = all_hooks_[func_name];
 
        LPVOID new_target = hook_vector.empty()
                                ? target
                                : hook_vector.back()->detour;
 
 
        if (DetourTransactionBegin())
        {
            Log::GetLog()->error("Failed to create Detour Transaction for {}", func_name);
            DetourTransactionAbort();
            return false;
        }
        if (DetourUpdateThread(GetCurrentThread()))
        {
            Log::GetLog()->error("Failed to update thread for {}", func_name);
            DetourTransactionAbort();
            return false;
        }
        if (DetourAttach(&new_target, detour))
        {
            Log::GetLog()->error("Failed to attach hook for {}", func_name);
            DetourTransactionAbort();
            return false;
        }
 
        if (DetourTransactionCommit())
        {
            Log::GetLog()->error("Failed to commit Detour Transaction for {}", func_name);
            DetourTransactionAbort();
            return false;
        }
        *original = new_target; //same as ppOriginal in MH_CreateHook
 
        hook_vector.push_back(std::make_shared<Hook>(new_target, detour, original));
 
        return true;
    }
 
    bool Hooks::DisableHook(const std::string& func_name, LPVOID detour)
    {
        const LPVOID target = Offsets::Get().GetAddress(func_name);
        if (target == nullptr)
        {
            Log::GetLog()->error("{} does not exist", func_name);
            return false;
        }
 
        auto& hook_vector = all_hooks_[func_name];
 
        const auto iter = std::find_if(hook_vector.begin(), hook_vector.end(),
                                       [detour](const std::shared_ptr<Hook>& hook) -> bool
                                       {
                                           return hook->detour == detour;
                                       });
 
        if (iter == hook_vector.end())
        {
            Log::GetLog()->warn("Failed to find hook ({})", func_name);
            return false;
        }
 
        if (DetourTransactionBegin())
        {
            Log::GetLog()->error("Failed to create Detour Transaction for {}", func_name);
            DetourTransactionAbort();
            return false;
        }
        if (DetourUpdateThread(GetCurrentThread()))
        {
            Log::GetLog()->error("Failed to update thread for {}", func_name);
            DetourTransactionAbort();
            return false;
        }
 
        // Remove all hooks placed on this function
        for (const auto& hook : hook_vector)
        {
            if (DetourDetach(&hook->target, hook->detour))
            {
                Log::GetLog()->error("Failed to detach Detour Transaction for {}", func_name);
                DetourTransactionAbort();
                return false;
            }
        }
 
        if (DetourTransactionCommit())
        {
            Log::GetLog()->error("Failed to commit Detour Transaction for {}", func_name);
            DetourTransactionAbort();
            return false;
        }
 
        // Remove hook from all_hooks vector
        hook_vector.erase(std::remove(hook_vector.begin(), hook_vector.end(), *iter), hook_vector.end());
 
        auto hook_vec(move(hook_vector));
        hook_vector.clear();
 
        // Enable all hooks again
        for (const auto& hook : hook_vec)
        {
            SetHookInternal(func_name, hook->detour, hook->original);
        }
 
        return true;
    }
} // namespace API
 
// Free function
AsaApi::IHooks& AsaApi::GetHooks()
{
    return reinterpret_cast<IHooks&>(*API::game_api->GetHooks());
}