Implement new .fip method of injecting mods

CubeModLoader/crc.cpp

@@ -0,0 +1,74 @@
+#include "crc.h"
+#include <iostream>
+
+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;
+}

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

CubeModLoader/main.cpp

@@ -2,10 +2,17 @@
 #include <windows.h>
 #include <vector>
 #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;
+void* base; // Module base
-vector <DLL*> modDLLs;
+vector <DLL*> 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;
@@ -59,14 +70,22 @@ 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) {
+void PrintLoadedMods() {
-    switch (fdwReason) {
+    std::string mods("Mods Loaded:\n");
-    case DLL_PROCESS_ATTACH:
+    for (DLL* dll : modDLLs) {
-        base = GetModuleHandle(NULL);
+        mods += dll->fileName;
+        mods += "\n";
+    }
+    Popup("Loaded Mods", mods.c_str());
+}
+
+// Handles injecting callbacks and the mods
+void StartMods() {
+    char msg[256] = {0};
 
     SetupHandlers();
 
@@ -99,7 +118,6 @@ extern "C" __declspec(dllexport) BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD
     }
 
     // Ensure version compatibility
-        char msg[512] = {0};
     for (DLL* dll: modDLLs) {
         int majorVersion = ((int(*)())dll->ModMajorVersion)();
         int minorVersion = ((int(*)())dll->ModMinorVersion)();
@@ -107,7 +125,6 @@ extern "C" __declspec(dllexport) BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD
             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;
 }