252 lines
8.1 KiB
C++
252 lines
8.1 KiB
C++
#include <iostream>
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#include <windows.h>
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#include <vector>
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#include "DLL.h"
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#include "crc.h"
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#define MOD_MAJOR_VERSION 4
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#define MOD_MINOR_VERSION 2
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#define CUBE_VERSION "1.0.0-1"
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#define CUBE_PACKED_CRC 0xC7682619
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#define CUBE_UNPACKED_CRC 0xBA092543
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#define MODLOADER_NAME "CubeModLoader"
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#define no_optimize __attribute__((optimize("O0")))
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#define MUST_IMPORT(dllname, name)\
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dllname->name = GetProcAddress(dllname->handle, #name);\
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if (!dllname->name) {\
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char ERROR_MESSAGE_POPUP[512] = {0};\
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sprintf(ERROR_MESSAGE_POPUP, "%s does not export " #name ".\n", dllname->fileName.c_str());\
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Popup("Error", ERROR_MESSAGE_POPUP);\
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exit(1);\
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}
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#define IMPORT(dllname, name)\
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dllname->name = GetProcAddress(dllname->handle, #name);
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#define PUSH_ALL "push rax\npush rbx\npush rcx\npush rdx\npush rsi\npush rdi\npush rbp\npush r8\npush r9\npush r10\npush r11\npush r12\npush r13\npush r14\npush r15\n"
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#define POP_ALL "pop r15\npop r14\npop r13\npop r12\npop r11\npop r10\npop r9\npop r8\npop rbp\npop rdi\npop rsi\npop rdx\npop rcx\npop rbx\npop rax\n"
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#define PREPARE_STACK "mov rax, rsp \n and rsp, 0xFFFFFFFFFFFFFFF0 \n push rax \n sub rsp, 0x28 \n"
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#define RESTORE_STACK "add rsp, 0x28 \n pop rsp \n"
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using namespace std;
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void* base; // Module base
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vector <DLL*> modDLLs; // Every mod we've loaded
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HMODULE hSelf; // A handle to ourself, to prevent being unloaded
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void* initterm_e; // A pointer to a function which is run extremely soon after starting, or after being unpacked
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const size_t BYTES_TO_MOVE = 14; // The size of a far jump
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char initterm_e_remember[BYTES_TO_MOVE]; // We'll use this to store the code we overwrite in initterm_e, so we can put it back later.
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void WriteFarJMP(void* source, void* destination) {
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DWORD dwOldProtection;
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VirtualProtect(source, 14, PAGE_EXECUTE_READWRITE, &dwOldProtection);
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char* location = (char*)source;
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// Far jump
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*((UINT16*)&location[0]) = 0x25FF;
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// mode
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*((UINT32*)&location[2]) = 0x00000000;
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*((UINT64*)&location[6]) = (UINT64)destination;
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VirtualProtect(location, 14, dwOldProtection, &dwOldProtection);
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}
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#include "callbacks/ChatHandler.h"
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#include "callbacks/P2PRequestHandler.h"
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#include "callbacks/CheckInventoryFullHandler.h"
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void SetupHandlers() {
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SetupChatHandler();
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SetupP2PRequestHandler();
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SetupCheckInventoryFullHandler();
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}
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void Popup(const char* title, const char* msg ) {
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MessageBoxA(0, msg, title, MB_OK | MB_ICONINFORMATION);
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}
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void PrintLoadedMods() {
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std::string mods("Mods Loaded:\n");
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for (DLL* dll : modDLLs) {
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mods += dll->fileName;
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mods += "\n";
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}
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Popup("Loaded Mods", mods.c_str());
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}
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// Handles injecting callbacks and the mods
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void StartMods() {
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char msg[256] = {0};
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SetupHandlers();
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//Find mods
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HANDLE hFind;
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WIN32_FIND_DATA data;
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CreateDirectory("Mods", NULL);
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hFind = FindFirstFile("Mods\\*.dll", &data);
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if (hFind != INVALID_HANDLE_VALUE) {
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do {
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// We should be loaded into the application's address space, so we can just LoadLibraryA
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DLL* dll = new DLL(string("Mods\\") + data.cFileName);
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dll->Load();
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printf("Loaded %s\n", dll->fileName.c_str());
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modDLLs.push_back(dll);
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} while (FindNextFile(hFind, &data));
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FindClose(hFind);
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}
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// Find all the functions the mods may export
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for (DLL* dll: modDLLs) {
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MUST_IMPORT(dll, ModMajorVersion);
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MUST_IMPORT(dll, ModMinorVersion);
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MUST_IMPORT(dll, ModPreInitialize);
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IMPORT(dll, ModInitialize);
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IMPORT(dll, HandleChat);
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IMPORT(dll, HandleP2PRequest);
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IMPORT(dll, HandleCheckInventoryFull);
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IMPORT(dll, HandleCheckMapIconVisibility);
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}
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// Ensure version compatibility
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for (DLL* dll: modDLLs) {
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int majorVersion = ((int(*)())dll->ModMajorVersion)();
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int minorVersion = ((int(*)())dll->ModMinorVersion)();
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if (majorVersion != MOD_MAJOR_VERSION) {
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sprintf(msg, "%s has major version %d but requires %d.\n", dll->fileName.c_str(), majorVersion, MOD_MAJOR_VERSION);
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Popup("Error", msg);
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exit(1);
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if (minorVersion > MOD_MINOR_VERSION) {
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sprintf(msg, "%s has minor version %d but requires %d or lower.\n", dll->fileName.c_str(), minorVersion, MOD_MINOR_VERSION);
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Popup("Error", msg);
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exit(1);
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}
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}
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// Run Initialization routines on all mods
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for (DLL* dll: modDLLs) {
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((void(*)())dll->ModPreInitialize)();
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}
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for (DLL* dll: modDLLs) {
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if (dll->ModInitialize) {
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((void(*)())dll->ModInitialize)();
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}
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}
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}
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if (hSelf) PrintLoadedMods();
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return;
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}
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void* StartMods_ptr = (void*)&StartMods;
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void no_optimize ASMStartMods() {
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asm(PUSH_ALL
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PREPARE_STACK
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// Initialize mods and callbacks
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"call [StartMods_ptr] \n"
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// We can put initterm_e back how we found it.
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"call [CopyInitializationBack_ptr] \n"
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RESTORE_STACK
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POP_ALL
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// Run initterm_e properly this time.
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"jmp [initterm_e] \n"
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);
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}
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void PatchFreeImage(){
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// Thanks to frognik for showing off this method!
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DWORD oldProtect;
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void* patchaddr = (void*)GetModuleHandleA("FreeImage.dll") + 0x1E8C12;
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VirtualProtect((LPVOID)patchaddr, 8, PAGE_EXECUTE_READWRITE, &oldProtect);
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*(uint64_t*)patchaddr = 0x909090000000A8E9;
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}
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void InitializationPatch() {
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// Get pointer to initterm_e
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initterm_e = *(void**)(base + 0x42CBD8);
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// Store old code, we'll copy it back once we regain control.
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memcpy(initterm_e_remember, initterm_e, BYTES_TO_MOVE);
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// Write a jump to our code
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WriteFarJMP(initterm_e, (void*)&ASMStartMods);
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}
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// This restores initterm_e to how it was before we hijacked it.
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void CopyInitializationBack() {
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DWORD dwOldProtection;
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VirtualProtect(initterm_e, BYTES_TO_MOVE, PAGE_EXECUTE_READWRITE, &dwOldProtection);
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memcpy(initterm_e, initterm_e_remember, BYTES_TO_MOVE);
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VirtualProtect(initterm_e, BYTES_TO_MOVE, dwOldProtection, &dwOldProtection);
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return;
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}
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void* CopyInitializationBack_ptr = (void*)&CopyInitializationBack;
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bool already_ran = false;
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extern "C" __declspec(dllexport) BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
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switch (fdwReason) {
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case DLL_PROCESS_ATTACH:
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base = GetModuleHandle(NULL);
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// Don't allow this to run more than once
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if (already_ran)
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return true;
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already_ran = true;
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char msg[256] = {0};
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// This serves to prevent ourself from being unloaded, if we are a .fip
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hSelf = LoadLibrary(MODLOADER_NAME ".fip");
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// The user could also inject this as a DLL, so if we can't find our .fip, we were probably launched with a launcher.
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// Therefore, we don't need to prompt the user.
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if (hSelf) {
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if (MessageBoxA(NULL, "Would you like to run with mods?", "Cube World Mod Loader", MB_YESNO) != IDYES) {
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PatchFreeImage();
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return true;
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}
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}
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base = GetModuleHandle(NULL);
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// Figure out where the executable is and verify its checksum
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char cubePath[_MAX_PATH+1];
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GetModuleFileName(NULL, cubePath, _MAX_PATH);
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uint32_t checksum = crc32_file(cubePath);
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if (checksum == CUBE_PACKED_CRC || checksum == CUBE_UNPACKED_CRC) {
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// Patch some code to run StartMods. This method makes it work with AND without SteamStub.
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InitializationPatch();
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} else {
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sprintf(msg, "%s does not seem to be version %s. CRC %08X", cubePath, CUBE_VERSION, checksum);
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Popup("Error", msg);
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PatchFreeImage();
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return true;
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}
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Sleep(250);
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PatchFreeImage();
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}
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return true;
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}
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