Hi, guys!

I want to use AngelScript in my Windows kernelmode framework to get easy and convenient access to native system functions.

What I really need is dynamic functions importing that are absent in compile-time.
For example, I got a raw native address and want to call it using funcdefs (or something else if it possible in other ways).

How could I achieve this?

For example I have an attempt with something like this:

uint64_t getKernelProcAddress(const std::string& str)
{
    ANSI_STRING ansi{};
    RtlInitAnsiString(&ansi, str.c_str());
    UNICODE_STRING name{};
    NTSTATUS status = RtlAnsiStringToUnicodeString(&name, &ansi, TRUE);
    if (!NT_SUCCESS(status))
    {
        return 0;
    }

    void* addr = MmGetSystemRoutineAddress(&name);
    RtlFreeUnicodeString(&name);
    return reinterpret_cast<uint64_t>(addr);
}

CScriptAny* registerNative(uint64_t engine, const std::string& prototype, uint64_t address)
{
    asIScriptEngine* e = reinterpret_cast<asIScriptEngine*>(engine);
    int res = e->RegisterGlobalFunction(prototype.c_str(), asFUNCTION(address), asCALL_STDCALL);
    assert(res >= 0);

    asIScriptFunction* func = mod->GetGlobalFunctionByDecl(prototype.c_str());
    CScriptAny* any = new CScriptAny(e);
    any->Store(func, func->GetTypeId());
    // ^ Asserts here with message 'index < length' in as_scriptengine.cpp:4449 (WIP-2.35 2020/07/17)

    return any;
}

void test()
{
    ...

    res = engine->RegisterGlobalFunction("any @registerNative(uint64, const string &in, uint64)", asFUNCTION(registerNative), asCALL_STDCALL);
    assert(res >= 0);

    res = engine->RegisterGlobalFunction("uint64 getKernelProcAddress(const string &in)", asFUNCTION(getKernelProcAddress), asCALL_STDCALL);
    assert(res >= 0);

    const char script[] =
        "funcdef uint64 FnGetEprocess();\n"
        "\n"
        "uint64 main(uint64 engine)\n"
        "{\n"
        "    uint64 addr = getKernelProcAddress('PsGetCurrentProcess');\n"
        "    any func = registerNative(engine, 'uint64 PsGetCurrentProcess()', addr);\n"
        "    FnGetEprocess @getEprocess;\n"
        "    func.retrieve(@getEprocess);\n"
        "    uint64 eprocess = getEprocess();\n"
        "    return eprocess;\n"
        "}\n";
        
    ... Running this script ...
}

So, is it possible to do something like this?