diff --git a/CubeModLoader/crc.cpp b/CubeModLoader/crc.cpp new file mode 100644 index 0000000..48247a3 --- /dev/null +++ b/CubeModLoader/crc.cpp @@ -0,0 +1,74 @@ +#include "crc.h" +#include + +unsigned int crc32_table[] = { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, + 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, + 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, + 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, + 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, + 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, + 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, + 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, + 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, + 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, + 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, + 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, + 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, + 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, + 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, + 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, + 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, + 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, + 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, + 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, + 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, + 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, + 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, + 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, + 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, + 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, + 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d +}; + +unsigned int crc32_buf(const char* buf, unsigned long len) +{ + unsigned int crc = ~0; + while (len--) + crc = crc32_table[(crc ^ *buf++) & 0xFF] ^ (crc >> 8); + return crc ^ ~0; +} + +unsigned int crc32_file(const char* fileName){ + FILE* file = fopen(fileName, "rb"); + + fseek(file, 0, SEEK_END); + int fileSize = ftell(file); + char* fileContents = new char[fileSize+1]; + + fseek(file, 0, SEEK_SET); + fread(fileContents, 1, fileSize, file); + fclose(file); + + int result = crc32_buf(fileContents, fileSize); + + delete[] fileContents; + + return result; +} diff --git a/CubeModLoader/crc.h b/CubeModLoader/crc.h new file mode 100644 index 0000000..7b72c1f --- /dev/null +++ b/CubeModLoader/crc.h @@ -0,0 +1,7 @@ +#ifndef CRC_H +#define CRC_H + +unsigned int crc32_buf(const char* buf, unsigned long len); +unsigned int crc32_file(const char* fileName); + +#endif // CRC_H diff --git a/CubeModLoader/main.cpp b/CubeModLoader/main.cpp index 94badcb..4d811e5 100644 --- a/CubeModLoader/main.cpp +++ b/CubeModLoader/main.cpp @@ -2,10 +2,17 @@ #include #include #include "DLL.h" +#include "crc.h" #define MOD_MAJOR_VERSION 4 #define MOD_MINOR_VERSION 1 +#define CUBE_VERSION "1.0.0-1" +#define CUBE_PACKED_CRC 0xC7682619 +#define CUBE_UNPACKED_CRC 0xBA092543 + +#define MODLOADER_NAME "CubeModLoader" + #define no_optimize __attribute__((optimize("O0"))) @@ -30,8 +37,12 @@ dllname->name = GetProcAddress(dllname->handle, #name); using namespace std; -void* base; -vector modDLLs; +void* base; // Module base +vector modDLLs; // Every mod we've loaded +HMODULE hSelf; // A handle to ourself, to prevent being unloaded +void* initterm_e; // A pointer to a function which is run extremely soon after starting, or after being unpacked +const size_t BYTES_TO_MOVE = 14; // The size of a far jump +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. void WriteFarJMP(void* source, void* destination) { DWORD dwOldProtection; @@ -59,55 +70,61 @@ void SetupHandlers() { SetupCheckInventoryFullHandler(); } -void Popup(const char* title, char* msg ){ +void Popup(const char* title, const char* msg ) { MessageBoxA(0, msg, title, MB_OK | MB_ICONINFORMATION); } -extern "C" __declspec(dllexport) BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { - switch (fdwReason) { - case DLL_PROCESS_ATTACH: - base = GetModuleHandle(NULL); +void PrintLoadedMods() { + std::string mods("Mods Loaded:\n"); + for (DLL* dll : modDLLs) { + mods += dll->fileName; + mods += "\n"; + } + Popup("Loaded Mods", mods.c_str()); +} - SetupHandlers(); +// Handles injecting callbacks and the mods +void StartMods() { + char msg[256] = {0}; - //Find mods - HANDLE hFind; - WIN32_FIND_DATA data; + SetupHandlers(); - CreateDirectory("Mods", NULL); - hFind = FindFirstFile("Mods\\*.dll", &data); - if (hFind != INVALID_HANDLE_VALUE) { - do { - // We should be loaded into the application's address space, so we can just LoadLibraryA - DLL* dll = new DLL(string("Mods\\") + data.cFileName); - dll->Load(); - printf("Loaded %s\n", dll->fileName.c_str()); - modDLLs.push_back(dll); - } while (FindNextFile(hFind, &data)); - FindClose(hFind); - } + //Find mods + HANDLE hFind; + WIN32_FIND_DATA data; - // Find all the functions the mods may export - for (DLL* dll: modDLLs) { - MUST_IMPORT(dll, ModMajorVersion); - MUST_IMPORT(dll, ModMinorVersion); - MUST_IMPORT(dll, ModPreInitialize); - IMPORT(dll, ModInitialize); - IMPORT(dll, HandleChat); - IMPORT(dll, HandleP2PRequest); - IMPORT(dll, HandleCheckInventoryFull); - } + CreateDirectory("Mods", NULL); + hFind = FindFirstFile("Mods\\*.dll", &data); + if (hFind != INVALID_HANDLE_VALUE) { + do { + // We should be loaded into the application's address space, so we can just LoadLibraryA + DLL* dll = new DLL(string("Mods\\") + data.cFileName); + dll->Load(); + printf("Loaded %s\n", dll->fileName.c_str()); + modDLLs.push_back(dll); + } while (FindNextFile(hFind, &data)); + FindClose(hFind); + } - // Ensure version compatibility - char msg[512] = {0}; - for (DLL* dll: modDLLs) { - int majorVersion = ((int(*)())dll->ModMajorVersion)(); - int minorVersion = ((int(*)())dll->ModMinorVersion)(); - if (majorVersion != MOD_MAJOR_VERSION) { - sprintf(msg, "%s has major version %d but requires %d.\n", dll->fileName.c_str(), majorVersion, MOD_MAJOR_VERSION); - Popup("Error", msg); - exit(1); - } + // Find all the functions the mods may export + for (DLL* dll: modDLLs) { + MUST_IMPORT(dll, ModMajorVersion); + MUST_IMPORT(dll, ModMinorVersion); + MUST_IMPORT(dll, ModPreInitialize); + IMPORT(dll, ModInitialize); + IMPORT(dll, HandleChat); + IMPORT(dll, HandleP2PRequest); + IMPORT(dll, HandleCheckInventoryFull); + } + + // Ensure version compatibility + for (DLL* dll: modDLLs) { + int majorVersion = ((int(*)())dll->ModMajorVersion)(); + int minorVersion = ((int(*)())dll->ModMinorVersion)(); + if (majorVersion != MOD_MAJOR_VERSION) { + sprintf(msg, "%s has major version %d but requires %d.\n", dll->fileName.c_str(), majorVersion, MOD_MAJOR_VERSION); + Popup("Error", msg); + exit(1); if (minorVersion > MOD_MINOR_VERSION) { sprintf(msg, "%s has minor version %d but requires %d or lower.\n", dll->fileName.c_str(), minorVersion, MOD_MINOR_VERSION); @@ -126,7 +143,107 @@ extern "C" __declspec(dllexport) BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD ((void(*)())dll->ModInitialize)(); } } + } + if (hSelf) PrintLoadedMods(); + return; +} +void* StartMods_ptr = (void*)&StartMods; +void no_optimize ASMStartMods() { + asm(PUSH_ALL + PREPARE_STACK + + // Initialize mods and callbacks + "call [StartMods_ptr] \n" + + // We can put initterm_e back how we found it. + "call [CopyInitializationBack_ptr] \n" + + RESTORE_STACK + POP_ALL + + // Run initterm_e properly this time. + "jmp [initterm_e] \n" + ); +} + +void PatchFreeImage(){ + DWORD oldProtect; + void* patchaddr = (void*)GetModuleHandleA("FreeImage.dll") + 0x1E8C12; + VirtualProtect((LPVOID)patchaddr, 8, PAGE_EXECUTE_READWRITE, &oldProtect); + *(uint64_t*)patchaddr = 0x909090000000A8E9; +} + +void InitializationPatch() { + // Get pointer to initterm_e + initterm_e = *(void**)(base + 0x42CBD8); + + // Store old code, we'll copy it back once we regain control. + memcpy(initterm_e_remember, initterm_e, BYTES_TO_MOVE); + + // Write a jump to our code + WriteFarJMP(initterm_e, (void*)&ASMStartMods); +} + +// This restores initterm_e to how it was before we hijacked it. +void CopyInitializationBack() { + DWORD dwOldProtection; + VirtualProtect(initterm_e, BYTES_TO_MOVE, PAGE_EXECUTE_READWRITE, &dwOldProtection); + + memcpy(initterm_e, initterm_e_remember, BYTES_TO_MOVE); + + VirtualProtect(initterm_e, BYTES_TO_MOVE, dwOldProtection, &dwOldProtection); + + return; +} +void* CopyInitializationBack_ptr = (void*)&CopyInitializationBack; + +bool already_ran = false; +extern "C" __declspec(dllexport) BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { + switch (fdwReason) { + case DLL_PROCESS_ATTACH: + base = GetModuleHandle(NULL); + + // Don't allow this to run more than once + if (already_ran) + return 1; + + already_ran = true; + + char msg[256] = {0}; + + // This serves to prevent ourself from being unloaded, if we are a .fip + hSelf = LoadLibrary(MODLOADER_NAME ".fip"); + + // The user could also inject this as a DLL, so if we can't find our .fip, we were probably launched with a launcher. + // Therefore, we don't need to prompt the user. + if (hSelf) { + if (MessageBoxA(NULL, "Would you like to run with mods?", "Cube World Mod Loader", MB_YESNO) != IDYES) { + PatchFreeImage(); + return true; + } + } + + base = GetModuleHandle(NULL); + + + // Figure out where the executable is and verify its checksum + char cubePath[_MAX_PATH+1]; + GetModuleFileName(NULL, cubePath, _MAX_PATH); + + uint32_t checksum = crc32_file(cubePath); + if (checksum == CUBE_PACKED_CRC || checksum == CUBE_UNPACKED_CRC) { + // Patch some code to run StartMods. This method makes it work with AND without SteamStub. + InitializationPatch(); + } else { + sprintf(msg, "%s does not seem to be version %s. CRC %08X", cubePath, CUBE_VERSION, checksum); + Popup("Error", msg); + PatchFreeImage(); + return true; + } + + Sleep(250); + PatchFreeImage(); } return true; }