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Alexander
2024-12-31 13:13:01 +00:00
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/*
* MinHook - The Minimalistic API Hooking Library for x64/x86
* Copyright (C) 2009-2017 Tsuda Kageyu.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if !(defined _M_IX86) && !(defined _M_X64) && !(defined __i386__) && !(defined __x86_64__)
#error MinHook supports only x86 and x64 systems.
#endif
#include <windows.h>
// MinHook Error Codes.
typedef enum MH_STATUS
{
// Unknown error. Should not be returned.
MH_UNKNOWN = -1,
// Successful.
MH_OK = 0,
// MinHook is already initialized.
MH_ERROR_ALREADY_INITIALIZED,
// MinHook is not initialized yet, or already uninitialized.
MH_ERROR_NOT_INITIALIZED,
// The hook for the specified target function is already created.
MH_ERROR_ALREADY_CREATED,
// The hook for the specified target function is not created yet.
MH_ERROR_NOT_CREATED,
// The hook for the specified target function is already enabled.
MH_ERROR_ENABLED,
// The hook for the specified target function is not enabled yet, or already
// disabled.
MH_ERROR_DISABLED,
// The specified pointer is invalid. It points the address of non-allocated
// and/or non-executable region.
MH_ERROR_NOT_EXECUTABLE,
// The specified target function cannot be hooked.
MH_ERROR_UNSUPPORTED_FUNCTION,
// Failed to allocate memory.
MH_ERROR_MEMORY_ALLOC,
// Failed to change the memory protection.
MH_ERROR_MEMORY_PROTECT,
// The specified module is not loaded.
MH_ERROR_MODULE_NOT_FOUND,
// The specified function is not found.
MH_ERROR_FUNCTION_NOT_FOUND
}
MH_STATUS;
// Can be passed as a parameter to MH_EnableHook, MH_DisableHook,
// MH_QueueEnableHook or MH_QueueDisableHook.
#define MH_ALL_HOOKS NULL
#ifdef __cplusplus
extern "C" {
#endif
// Initialize the MinHook library. You must call this function EXACTLY ONCE
// at the beginning of your program.
MH_STATUS WINAPI MH_Initialize(VOID);
// Uninitialize the MinHook library. You must call this function EXACTLY
// ONCE at the end of your program.
MH_STATUS WINAPI MH_Uninitialize(VOID);
// Creates a hook for the specified target function, in disabled state.
// Parameters:
// pTarget [in] A pointer to the target function, which will be
// overridden by the detour function.
// pDetour [in] A pointer to the detour function, which will override
// the target function.
// ppOriginal [out] A pointer to the trampoline function, which will be
// used to call the original target function.
// This parameter can be NULL.
MH_STATUS WINAPI MH_CreateHook(LPVOID pTarget, LPVOID pDetour, LPVOID *ppOriginal);
// Creates a hook for the specified API function, in disabled state.
// Parameters:
// pszModule [in] A pointer to the loaded module name which contains the
// target function.
// pszProcName [in] A pointer to the target function name, which will be
// overridden by the detour function.
// pDetour [in] A pointer to the detour function, which will override
// the target function.
// ppOriginal [out] A pointer to the trampoline function, which will be
// used to call the original target function.
// This parameter can be NULL.
MH_STATUS WINAPI MH_CreateHookApi(
LPCWSTR pszModule, LPCSTR pszProcName, LPVOID pDetour, LPVOID *ppOriginal);
// Creates a hook for the specified API function, in disabled state.
// Parameters:
// pszModule [in] A pointer to the loaded module name which contains the
// target function.
// pszProcName [in] A pointer to the target function name, which will be
// overridden by the detour function.
// pDetour [in] A pointer to the detour function, which will override
// the target function.
// ppOriginal [out] A pointer to the trampoline function, which will be
// used to call the original target function.
// This parameter can be NULL.
// ppTarget [out] A pointer to the target function, which will be used
// with other functions.
// This parameter can be NULL.
MH_STATUS WINAPI MH_CreateHookApiEx(
LPCWSTR pszModule, LPCSTR pszProcName, LPVOID pDetour, LPVOID *ppOriginal, LPVOID *ppTarget);
// Removes an already created hook.
// Parameters:
// pTarget [in] A pointer to the target function.
MH_STATUS WINAPI MH_RemoveHook(LPVOID pTarget);
// Enables an already created hook.
// Parameters:
// pTarget [in] A pointer to the target function.
// If this parameter is MH_ALL_HOOKS, all created hooks are
// enabled in one go.
MH_STATUS WINAPI MH_EnableHook(LPVOID pTarget);
// Disables an already created hook.
// Parameters:
// pTarget [in] A pointer to the target function.
// If this parameter is MH_ALL_HOOKS, all created hooks are
// disabled in one go.
MH_STATUS WINAPI MH_DisableHook(LPVOID pTarget);
// Queues to enable an already created hook.
// Parameters:
// pTarget [in] A pointer to the target function.
// If this parameter is MH_ALL_HOOKS, all created hooks are
// queued to be enabled.
MH_STATUS WINAPI MH_QueueEnableHook(LPVOID pTarget);
// Queues to disable an already created hook.
// Parameters:
// pTarget [in] A pointer to the target function.
// If this parameter is MH_ALL_HOOKS, all created hooks are
// queued to be disabled.
MH_STATUS WINAPI MH_QueueDisableHook(LPVOID pTarget);
// Applies all queued changes in one go.
MH_STATUS WINAPI MH_ApplyQueued(VOID);
// Translates the MH_STATUS to its name as a string.
const char * WINAPI MH_StatusToString(MH_STATUS status);
#ifdef __cplusplus
}
#endif

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// Because external hooking is a fucking nightmare I'm just gonna inject this on launch, hook a func and inject the real Mercury DLL at that point.
// It's a bit hacky, but without a Mercury update to make things, functional, this is the best I can do :(
#include <iostream>
#include <ShlObj.h>
#include "MinHook/MinHook.h"
const uintptr_t SetSubGameOffset = 0x2E4F760;
HMODULE handle;
template<typename T>
static T* Offset(uintptr_t offset)
{
return reinterpret_cast<T*>(reinterpret_cast<uintptr_t>(GetModuleHandle(0)) + offset);
}
void (*SetSubGame)(void* thisref, uint8_t SubGame) = nullptr;
void SetSubGameHook(void* thisref, uint8_t SubGame)
{
if (SubGame != 0) // not campaign, ignore
{
SetSubGame(thisref, SubGame);
return;
}
PWSTR rawLocalAppData;
SHGetKnownFolderPath(FOLDERID_LocalAppData, 0, NULL, &rawLocalAppData);
std::wstring localAppData(rawLocalAppData);
CoTaskMemFree(rawLocalAppData);
std::wstring dllPath(localAppData + L"\\Mercury\\Mercury-1.8.dll");
// reference https://github.com/ZeroMemoryEx/Dll-Injector/blob/master/DLL-Injector/Dll-Injector.cpp#L43
HANDLE fnHandle = OpenProcess(PROCESS_ALL_ACCESS, 0, GetCurrentProcessId());
void* location = VirtualAllocEx(fnHandle, 0, MAX_PATH, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
BOOL write = WriteProcessMemory(fnHandle, location, dllPath.c_str(), wcslen(dllPath.c_str()) * sizeof(wchar_t) + sizeof(wchar_t), 0);
if (!write)
{
std::cerr << "DLL failed to inject (WriteProcessMemory failed).\n";
MH_DisableHook(Offset<uintptr_t>(SetSubGameOffset));
SetSubGame(thisref, SubGame);
FreeLibraryAndExitThread(handle, 0);
return;
}
HANDLE thread = CreateRemoteThread(fnHandle, 0, 0, (LPTHREAD_START_ROUTINE)LoadLibraryW, location, 0, 0);
if (!thread)
{
std::cerr << "DLL failed to inject (CreateRemoteThread failed).\n";
MH_DisableHook(Offset<uintptr_t>(SetSubGameOffset));
SetSubGame(thisref, SubGame);
FreeLibraryAndExitThread(handle, 0);
return;
}
WaitForSingleObject(thread, INFINITE);
VirtualFree(location, 0, MEM_RELEASE);
MH_DisableHook(Offset<uintptr_t>(SetSubGameOffset));
SetSubGame(thisref, SubGame);
return;
}
DWORD MainThread(LPVOID)
{
AllocConsole();
ShowWindow(GetConsoleWindow(), SW_SHOW);
FILE* fp;
freopen_s(&fp, "CONOUT$", "w", stderr);
MH_Initialize();
LPVOID off = Offset<uintptr_t>(SetSubGameOffset);
MH_CreateHook(off, SetSubGameHook, reinterpret_cast<LPVOID*>(&SetSubGame));
MH_EnableHook(off);
return 0;
}
BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
handle = hModule;
CreateThread(0, 0, MainThread, 0, 0, 0);
break;
}
return TRUE;
}

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#pragma once
#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
// Windows Header Files
#include <windows.h>