hook_RN.js

function hook_RegisterNatives() {
    var symbols = Module.enumerateSymbolsSync("libart.so");
    var addrRegisterNatives = null;
    for (var i = 0; i < symbols.length; i++) {
        var symbol = symbols[i];
        
        //_ZN3art3JNI15RegisterNativesEP7_JNIEnvP7_jclassPK15JNINativeMethodi
        if (symbol.name.indexOf("art") >= 0 &&
                symbol.name.indexOf("JNI") >= 0 && 
                symbol.name.indexOf("RegisterNatives") >= 0 && 
                symbol.name.indexOf("CheckJNI") < 0) {
            addrRegisterNatives = symbol.address;
            console.log("RegisterNatives is at ", symbol.address, symbol.name);
        }
    }

    if (addrRegisterNatives != null) {
        Interceptor.attach(addrRegisterNatives, {
            onEnter: function (args) {
                console.log("[RegisterNatives] method_count:", args[3]);
                var env = args[0];
                var java_class = args[1];
                var class_name = Java.vm.tryGetEnv().getClassName(java_class);
                //console.log(class_name);

                var methods_ptr = ptr(args[2]);

                var method_count = parseInt(args[3]);
                for (var i = 0; i < method_count; i++) {
                    var name_ptr = Memory.readPointer(methods_ptr.add(i * Process.pointerSize * 3));
                    var sig_ptr = Memory.readPointer(methods_ptr.add(i * Process.pointerSize * 3 + Process.pointerSize));
                    var fnPtr_ptr = Memory.readPointer(methods_ptr.add(i * Process.pointerSize * 3 + Process.pointerSize * 2));

                    var name = Memory.readCString(name_ptr);
                    var sig = Memory.readCString(sig_ptr);
                    var find_module = Process.findModuleByAddress(fnPtr_ptr);
                    console.log("[RegisterNatives] java_class:", class_name, "name:", name, "sig:", sig, "fnPtr:", fnPtr_ptr, "module_name:", find_module.name, "module_base:", find_module.base, "offset:", ptr(fnPtr_ptr).sub(find_module.base));

                }
            }
        });
    }
}

setImmediate(hook_RegisterNatives);