Prestige injector (Rust)

PrestigeInjector.exe loads prestige_native.dll into a running Minecraft 1.21.11 Fabric JVM (64-bit, Fabric Loader 0.19.x, Fabric API installed). It uses the same overall method as the openvape bundle, written from scratch in Rust with no external crates.

How it works

Injector lists visible java.exe/javaw.exe windows (refreshed every 750 ms), then runs LoadLibraryW in the chosen process through CreateRemoteThread and confirms the module is mapped.
prestige_native.dll (DllMain only spawns a worker thread):
- waits for jvm.dll, JNI_GetCreatedJavaVMs, attaches, acquires the JVMTI redefine/retransform capabilities;
- writes the embedded payload jar (the remapped prestige-*.jar) to %TEMP%\PrestigeLoader;
- FabricLauncherBase.getLauncher().addToClassPath(jar) so payload and game classes share the Knot class loader;
- registers NativeBridge.classBytes / NativeBridge.redefine and calls Bootstrap.start().
Bootstrap (Java) waits for the client window, then for every ClassTransform hook target gets the current class bytes (JVMTI retransform capture), runs the hooks through InPlaceTransformer and redefines the class. The bundled ClassTransform inlines hook handlers into the target methods, so normally nothing is added to the class and a plain redefine works. If a transformer ever does add methods (a running JVM cannot), they are moved into generated dev.zprestige.prestige.hooks.H* helper classes, call sites become invokestatic, and private member access goes through Access MethodHandles. Finally the Prestige and ClickGUI entrypoints run on the client thread.

Log: prestige-native.log beside the DLL, plus [Prestige-Inject] lines in the game log.

Build

.\build-injector.ps1      # gradlew remapJar, cargo build --release, copies to dist\

Use

Start a Fabric 1.21.11 instance, then run dist\PrestigeInjector.exe (or PrestigeInjector.exe <pid> [dll]).