Hey,
I am new to GameHacking and new to c++. So possibly I am just not good enough to understand whats going on.
The goal:
The game I am trying to mod is full of protobufs. One often used types is
I want to create a new working instance of a
First steps:
I made my first stepts in Frida to get a view of whats happaning ingame.
I got a working solution thankfully with the option to `inflate` with the `frida-il2cpp-bridge`.
The code for my specific RepeatedField looks like this:
Magic Inflation `return getClass('RepeatedField`1', 'Google.Protobuf')?.inflate(Glyph.Klass)!;`
I know that the compiled code in c++ actually have no generics like RepeatedField with generics. But If I log out the class and namespace it returns also RepeatedField`1 by the namespace: `Google.protobuf.Collections.RepeatedField`.
My try to do so in c++ with some il2cpp-api-function help looks terrible for now. But this is my try:
I see the first error is that RepeatedField`1 has no constructor params.
But how to inflate or create a RepeatedField of a specific type anyway?
I really would like to know how to do so :(
Don't want to stick to frida-scripts xD
#Discord: pete.spencer
I am new to GameHacking and new to c++. So possibly I am just not good enough to understand whats going on.
The goal:
The game I am trying to mod is full of protobufs. One often used types is
Google.protobuf.Collections.RepeatedFieldI want to create a new working instance of a
RepeatedField<Glyph>First steps:
I made my first stepts in Frida to get a view of whats happaning ingame.
I got a working solution thankfully with the option to `inflate` with the `frida-il2cpp-bridge`.
The code for my specific RepeatedField looks like this:
JavaScript:
class RepeatedFieldGlyphs extends BaseWrapper {
constructor(instace?: Il2Cpp.Object) {
let obj: Il2Cpp.Object;
if (instace) {
obj = instace;
} else {
const newInstance = RepeatedFieldGlyphs.Klass.initialize().alloc();
newInstance.method('.ctor').invoke();
obj = newInstance;
}
super(obj);
}
@Cacheable()
static get Klass() {
return getClass('RepeatedField`1', 'Google.Protobuf')?.inflate(Glyph.Klass)!;
}
add = (glyph: Glyph) => {
this.object.method('Add').invoke(glyph.object);
};
}
const myRepeatedField = new RepeatedFieldGlyphs(); // just creates a new instanceI know that the compiled code in c++ actually have no generics like RepeatedField with generics. But If I log out the class and namespace it returns also RepeatedField`1 by the namespace: `Google.protobuf.Collections.RepeatedField`.
My try to do so in c++ with some il2cpp-api-function help looks terrible for now. But this is my try:
C++:
auto assemblyGoogleProtobuf = il2cpp_domain_assembly_open(domain, "Google.Protobuf");
auto googleProtoImage = il2cpp_assembly_get_image(assemblyGoogleProtobuf);
auto assemblyGameCore = il2cpp_domain_assembly_open(domain, "Game.Core");
auto assemblyGameCoreImage = il2cpp_assembly_get_image(assemblyGameCore);
Il2CppClass* repeatedFieldClass = il2cpp_class_from_name(googleProtoImage, "Google.Protobuf.Collections", "RepeatedField`1");
if (repeatedFieldClass) {
LOGD("repeatedFieldClass found: %i", repeatedFieldClass->is_generic);
const MethodInfo* constructor = il2cpp_class_get_method_from_name(repeatedFieldClass, ".ctor", 0);
if (constructor) {
LOGD("constructor found");
Il2CppClass* genericType = il2cpp_class_from_name(assemblyGameCoreImage, "Game.Core.Rpc.RpcUtil", "PKNEMGEEPLL");
if (genericType) {
LOGD("Type found");
Il2CppArray* typeArgs = il2cpp_array_new(genericType, 1);
LOGD("create new instance");
Il2CppObject* instanceRepeated = il2cpp_object_new(repeatedFieldClass);
void* constructorParameters[1] = { typeArgs };
LOGD("invoking constructor");
// Its crashing while invoking the constructor
il2cpp_runtime_invoke(constructor, instanceRepeated, constructorParameters, nullptr);
LOGD("instance of class: %s", instanceRepeated->klass->name);
}
}
}But how to inflate or create a RepeatedField of a specific type anyway?
I really would like to know how to do so :(
Don't want to stick to frida-scripts xD
#Discord: pete.spencer
Last edited:
