OpenSlinky/Slinky/src/Injector.cpp

#include "Injector.hpp"
#include "ProcessUtil.hpp"
#include "ConsoleUI.hpp"
#include "Resource.h"
#include <cstdio>
#include <vector>

namespace Slinky {

bool Injector::ExtractBundledDll(std::wstring& outDllPath, std::wstring& outLogPath) {
    wchar_t tempPath[MAX_PATH] = { 0 };
    if (!GetTempPathW(MAX_PATH, tempPath)) {
        ConsoleUI::PrintError("Finding temp folder", GetLastError());
        return false;
    }

    wchar_t slinkyTempDir[MAX_PATH] = { 0 };
    swprintf_s(slinkyTempDir, L"%lsslinky-%lu", tempPath, GetCurrentProcessId());

    if (!CreateDirectoryW(slinkyTempDir, nullptr) && GetLastError() != ERROR_ALREADY_EXISTS) {
        ConsoleUI::PrintError("Creating temp folder", GetLastError());
        return false;
    }

    outDllPath = std::wstring(slinkyTempDir) + L"\\SlinkyNative.dll";
    outLogPath = std::wstring(slinkyTempDir) + L"\\slinky-native.log";

    DeleteFileW(outLogPath.c_str());

    HRSRC hRes = FindResourceW(nullptr, MAKEINTRESOURCEW(IDR_BUNDLED_DLL), (LPCWSTR)10);
    if (hRes) {
        DWORD resSize = SizeofResource(nullptr, hRes);
        HGLOBAL hLoad = LoadResource(nullptr, hRes);
        if (hLoad && resSize > 0) {
            const void* pData = LockResource(hLoad);
            if (pData) {
                HANDLE hFile = CreateFileW(outDllPath.c_str(), GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
                if (hFile != INVALID_HANDLE_VALUE) {
                    DWORD written = 0;
                    WriteFile(hFile, pData, resSize, &written, nullptr);
                    CloseHandle(hFile);
                    return true;
                }
            }
        }
    }

    wchar_t exePath[MAX_PATH] = { 0 };
    if (GetModuleFileNameW(nullptr, exePath, MAX_PATH) > 0) {
        wchar_t* lastSlash = wcsrchr(exePath, L'\\');
        if (lastSlash) {
            *lastSlash = L'\0';
            std::wstring localDll = std::wstring(exePath) + L"\\SlinkyNative.dll";
            if (GetFileAttributesW(localDll.c_str()) != INVALID_FILE_ATTRIBUTES) {
                if (CopyFileW(localDll.c_str(), outDllPath.c_str(), FALSE)) {
                    return true;
                }
                outDllPath = localDll;
                outLogPath = std::wstring(exePath) + L"\\slinky-native.log";
                DeleteFileW(outLogPath.c_str());
                return true;
            }
        }
    }

    ConsoleUI::SetStatusText("Could not extract bundled DLL.");
    ConsoleUI::PrintError("Reading bundled DLL", ERROR_FILE_NOT_FOUND);
    return false;
}

bool Injector::InjectDll(DWORD pid, const std::wstring& dllPath) {
    if (ProcessUtil::IsModuleLoaded(pid, L"SlinkyNative.dll")) {
        ConsoleUI::SetStatusText("Unloading previous instance...");
        if (!ProcessUtil::UnloadModule(pid, L"SlinkyNative.dll")) {
            ConsoleUI::SetStatusText("Could not unload previous instance.");
            return false;
        }
        Sleep(300);
    }

    ConsoleUI::SetStatusText("Opening game process");
    HANDLE hProcess = OpenProcess(
        PROCESS_CREATE_THREAD | PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ | PROCESS_QUERY_INFORMATION,
        FALSE, pid);

    if (!hProcess) {
        ConsoleUI::PrintError("OpenProcess", GetLastError());
        return false;
    }

    ConsoleUI::SetStatusText("Allocating DLL path in game");
    SIZE_T pathSizeBytes = (dllPath.length() + 1) * sizeof(wchar_t);
    LPVOID pRemotePath = VirtualAllocEx(hProcess, nullptr, pathSizeBytes, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);

    if (!pRemotePath) {
        ConsoleUI::PrintError("Allocating DLL path in game", GetLastError());
        CloseHandle(hProcess);
        return false;
    }

    ConsoleUI::SetStatusText("Copying DLL path into game");
    if (!WriteProcessMemory(hProcess, pRemotePath, dllPath.c_str(), pathSizeBytes, nullptr)) {
        ConsoleUI::PrintError("Copying DLL path into game", GetLastError());
        VirtualFreeEx(hProcess, pRemotePath, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    ConsoleUI::SetStatusText("Finding Windows DLL loader");
    HMODULE hKernel32 = GetModuleHandleW(L"kernel32.dll");
    LPTHREAD_START_ROUTINE pLoadLibraryW = (LPTHREAD_START_ROUTINE)GetProcAddress(hKernel32, "LoadLibraryW");

    if (!pLoadLibraryW) {
        ConsoleUI::PrintError("Finding Windows DLL loader", GetLastError());
        VirtualFreeEx(hProcess, pRemotePath, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    ConsoleUI::SetStatusText("Starting DLL loader in game");
    HANDLE hThread = CreateRemoteThread(hProcess, nullptr, 0, pLoadLibraryW, pRemotePath, 0, nullptr);
    if (!hThread) {
        ConsoleUI::PrintError("Starting DLL loader in game", GetLastError());
        VirtualFreeEx(hProcess, pRemotePath, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    ConsoleUI::SetStatusText("Reading DLL loader result");
    DWORD waitRes = WaitForSingleObject(hThread, 30000);
    if (waitRes != WAIT_OBJECT_0) {
        ConsoleUI::SetStatusText("Game did not finish loading the DLL.");
        CloseHandle(hThread);
        VirtualFreeEx(hProcess, pRemotePath, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    DWORD dwExitCode = 0;
    GetExitCodeThread(hThread, &dwExitCode);
    CloseHandle(hThread);
    VirtualFreeEx(hProcess, pRemotePath, 0, MEM_RELEASE);
    CloseHandle(hProcess);

    if (dwExitCode == 0) {
        ConsoleUI::SetStatusText("LoadLibraryW failed in game process.");
        return false;
    }

    if (!ProcessUtil::WaitForModuleLoad(pid, L"SlinkyNative.dll", 5000)) {
        ConsoleUI::SetStatusText("DLL not in game after load attempt.");
        return false;
    }

    ConsoleUI::SetStatusText("Injected successfully");
    return true;
}

bool Injector::MonitorStartup(DWORD pid, const std::wstring& logPath) {
    HANDLE hProcess = OpenProcess(SYNCHRONIZE, FALSE, pid);

    ConsoleUI::SetStatusText("Still loading...");
    DWORD startTime = GetTickCount();
    const DWORD timeoutMs = 30000;

    while (GetTickCount() - startTime < timeoutMs) {
        if (hProcess && WaitForSingleObject(hProcess, 0) == WAIT_OBJECT_0) {
            ConsoleUI::SetStatusText("Game process closed before startup finished.");
            CloseHandle(hProcess);
            return false;
        }

        FILE* fp = nullptr;
        if (_wfopen_s(&fp, logPath.c_str(), L"r, ccs=UTF-8") == 0 && fp) {
            wchar_t line[1024];
            while (fgetws(line, 1024, fp)) {
                if (wcsstr(line, L"FINAL STATUS: RUNNING")) {
                    ConsoleUI::SetStatusText("Press Right Shift in Minecraft.");
                    fclose(fp);
                    if (hProcess) CloseHandle(hProcess);
                    return true;
                } else if (wcsstr(line, L"FINAL STATUS: RELOADED")) {
                    ConsoleUI::SetStatusText("Slinky reloaded. Press Right Shift.");
                    fclose(fp);
                    if (hProcess) CloseHandle(hProcess);
                    return true;
                } else if (wcsstr(line, L"FINAL STATUS: ALREADY_RUNNING")) {
                    ConsoleUI::SetStatusText("Already running. Unload from menu first.");
                    fclose(fp);
                    if (hProcess) CloseHandle(hProcess);
                    return false;
                } else if (wcsstr(line, L"FINAL STATUS: FAILED")) {
                    ConsoleUI::SetStatusText("Slinky could not start.");
                    fclose(fp);
                    if (hProcess) CloseHandle(hProcess);
                    return false;
                }
            }
            fclose(fp);
        }

        Sleep(150);
    }

    if (hProcess) CloseHandle(hProcess);
    ConsoleUI::SetStatusText("DLL loaded but Slinky never confirmed startup.");
    return false;
}

} // namespace Slinky