ByNameModding

Modding (hacking) il2cpp games by classes, methods, fields names.

Status: Ready to use

Why did I do it

1. In order not to update the offset of the unity methods

2. For fun.

Bugs:

Everything is fixed. but it is not exactly :)

File structure:

• Class LoadClass

  • Methods:

    • LoadClass(const char *namespce, const char *clazz, const char *dllname - optional)
    • LoadClass(Il2CppClass *clazz)
    • GetFieldInfoByName(const char *name)
    • GetFieldByName(const char *name)
    • GetFieldOffset(const char *name or Fieldinfo *filed)
    • GetMethodInfoByName(const char *name, int paramcount)
    • GetMethodOffsetByName(const char *name, int paramcoun)

• Class Field

  • Methods:

    • Field(FieldInfo *thiz, void *_instance - optional for static)
    • get_offset()
    • get()
    • set(T val)

  • Fields:

    • init
    • thread_static
    • clazz

• void * get_Method(const char *str)

Usage

get_method example

/* get_method: edit fov example
* code from here
* Il2CppResolver
* https://github.com/MJx0/IL2CppResolver/blob/master/Android/test/src/demo.cpp
* MJx0's IL2CppResolver doesn't work
* get_method working ONLY with extren methods
*/
void *set_fov(float value) {
    int (*Screen$$get_height)();
    int (*Screen$$get_width)();
    InitResolveFunc(Screen$$get_height, OBFUSCATE("UnityEngine.Screen::get_height()")); // #define InitResolveFunc(x, y)
    InitResolveFunc(Screen$$get_width, OBFUSCATE("UnityEngine.Screen::get_width()"));// Don't forgot about OBFUSCATE
    if (Screen$$get_height && Screen$$get_width) {
        LOGI(OBFUSCATE("%dx%d"), Screen$$get_height(), Screen$$get_width());
    }

    uintptr_t (*Camera$$get_main)(); // you can use void *
    float (*Camera$$get_fieldofview)(uintptr_t);
    void (*Camera$$set_fieldofview)(uintptr_t, float);

    InitResolveFunc(Camera$$get_main, OBFUSCATE("UnityEngine.Camera::get_main()"));
    InitResolveFunc(Camera$$set_fieldofview, OBFUSCATE("UnityEngine.Camera::set_fieldOfView(System.Single)"));
    InitResolveFunc(Camera$$get_fieldofview, OBFUSCATE("UnityEngine.Camera::get_fieldOfView()"));

    if (Camera$$get_main && Camera$$get_fieldofview && Camera$$set_fieldofview) {
        uintptr_t mainCamera = Camera$$get_main();
        if (mainCamera != 0) {
            float oldFOV = Camera$$get_fieldofview(mainCamera);
            Camera$$set_fieldofview(mainCamera, value);
            float newFOV = Camera$$get_fieldofview(mainCamera);
            LOGI(OBFUSCATE("Camera Ptr: %p  |  oldFOV: %.2f  |  newFOV: %.2f"), (void *) mainCamera, oldFOV,
                 newFOV);
        } else {
            LOGE(OBFUSCATE("mainCamera is currently not available!"));
        }
    }
}

LoadClass and Field exampels

void *(*get_Transform)(void *instance);
void (*set_position)(void *Transform, Vector3);
void *myPlayer;
void (*old_Update)(void *instance);
void Update(void *instance){
    old_Update(instance);
    if (instance){
        /** We have public static FPSControler LocalPlayer; **/
        FieldBN(localpalyer, void *, 0, "", "FPSControler", "LocalPlayer", 'z') // #define FieldBN(myfield, type, inst, nameSpacec, clazzz, fieldName, key)
        myPlayer = localpalyer; // or myPlayer = localpalyer();
        void *myPlayer_Transform = get_Transform(myPlayer);
        set_position(myPlayer_Transform, Vector3(0, 0, 0);
    }
}
void *hack_thread(void *) {
    do {
        sleep(1);
    } while (!isLibraryLoaded(libName));
    auto *Transform = new LoadClass(OBFUSCATE("UnityEngine"), OBFUSCATE("Transform"));
    auto *Component = new LoadClass(OBFUSCATE("UnityEngine"), OBFUSCATE("Component"));
    InitFunc(get_Transform, Component->GetMethodOffsetByName(OBFUSCATE("get_transform"), 0); // 0 - parametrs count in original c# method
    InitFunc(set_position, Transform->GetMethodOffsetByName(OBFUSCATE("set_position_Injected"), 1); // set_position working badly
    MSHookFunction((void *)LoadClass(OBFUSCATE_KEY("", 'i'), OBFUSCATE_KEY("FPSControler", 'c')).GetMethodOffsetByName(
            OBFUSCATE_KEY("Update", '|'), 0), (void *) Update, (void **) &old_Update);
}