not injecting to lunar client.

[athinaslime]

lunar client adds the flag "-XX:+DisableAttachMechanism", this completely blocks the client from injecting to it, here is the app.log

15:43:53 [DEBUG] (1) eframe: Using the glow renderer
15:43:53 [DEBUG] (1) sctk: Bound new global [58] wl_output v4
15:43:53 [DEBUG] (1) sctk: Bound new global [9] zxdg_output_manager_v1 v3
15:43:53 [DEBUG] (1) sctk: Bound new global [1] wl_seat v7
15:43:53 [DEBUG] (1) sctk: Bound new global [10] wp_cursor_shape_manager_v1 v1
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Argb8888
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Xrgb8888
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Xbgr8888
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Abgr8888
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Xrgb2101010
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Argb2101010
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Xbgr2101010
15:43:53 [DEBUG] (1) sctk: supported wl_shm format Abgr2101010
15:43:53 [DEBUG] (1) eframe::native::glow_integration: Event::Resumed
15:43:53 [DEBUG] (1) eframe::native::file_storage: Loading app state from "/home/athinaslime/.local/share/darkclientinjector/app.ron"…
15:43:53 [DEBUG] (1) eframe::native::glow_integration: trying to create glutin Display with config: ConfigTemplateBuilder { template: ConfigTemplate { color_buffer_type: Rgb { r_size: 8, g_size: 8, b_size: 8 }, alpha_size: 8, depth_size: 0, stencil_size: 0, num_samples: None, min_swap_interval: None, max_swap_interval: None, config_surface_types: ConfigSurfaceTypes(WINDOW), api: None, transparency: false, single_buffering: false, stereoscopy: None, float_pixels: false, max_pbuffer_width: None, hardware_accelerated: None, max_pbuffer_height: None, native_window: None } }
15:43:53 [DEBUG] (1) eframe::native::glow_integration: using the first config from config picker closure. config: Egl(Config { inner: Config { raw: EglConfig(0x56467c2d84b0), display: Khr(0x56467c29f010) } })
15:43:53 [DEBUG] (1) egui_winit: Failed to set window size
15:43:53 [DEBUG] (1) eframe::native::glow_integration: successfully created GL Display with version: EGL 1.5 and supported features: DisplayFeatures(CONTEXT_ROBUSTNESS | CONTEXT_NO_ERROR | FLOAT_PIXEL_FORMAT | SWAP_CONTROL | CREATE_ES_CONTEXT | MULTISAMPLING_PIXEL_FORMATS | SRGB_FRAMEBUFFERS)
15:43:53 [DEBUG] (1) eframe::native::glow_integration: creating gl context using raw window handle: Some(Wayland(WaylandWindowHandle { surface: 0x56467c2e2150 }))
15:43:53 [DEBUG] (1) eframe::native::glow_integration: Initializing egui_winit for viewport "FFFF"
15:43:53 [DEBUG] (1) eframe::native::glow_integration: Creating a gl_surface for viewport "FFFF"
15:43:53 [DEBUG] (3) sctk: Bound new global [1] wl_seat v7
15:43:53 [DEBUG] (1) egui_glow::painter:
opengl version: 4.6 (Core Profile) Mesa 25.1.3-arch1.3
opengl renderer: Mesa Intel(R) Arc(tm) A380 Graphics (DG2)
opengl vendor: Intel
15:43:53 [DEBUG] (1) egui_glow::shader_version: Shader version: Gl140 ("4.60").
15:43:53 [DEBUG] (1) egui_glow::painter: Shader header: "#version 140\n".
15:43:53 [DEBUG] (1) egui_glow::painter: SRGB texture Support: true
15:43:53 [DEBUG] (1) egui_glow::painter: SRGB framebuffer Support: true
15:43:53 [DEBUG] (1) egui_glow::vao: GL version: "4.6 (Core Profile) Mesa 25.1.3-arch1.3".
15:44:27 [INFO] Loading Agent Loader
15:44:27 [ERROR] jcmd failed (stderr): com.sun.tools.attach.AttachNotSupportedException: The VM does not support the attach mechanism
at jdk.attach/sun.tools.attach.HotSpotAttachProvider.testAttachable(HotSpotAttachProvider.java:145)
at jdk.attach/sun.tools.attach.AttachProviderImpl.attachVirtualMachine(AttachProviderImpl.java:56)
at jdk.attach/com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:207)
at jdk.jcmd/sun.tools.jcmd.JCmd.executeCommandForPid(JCmd.java:113)
at jdk.jcmd/sun.tools.jcmd.JCmd.main(JCmd.java:97)

15:44:28 [ERROR] Unable to connect to server: Os { code: 111, kind: ConnectionRefused, message: "Connection refused" }

any workarounds/fixes?

[TheDarkSword]

I have university exams right now. As soon as I'm done, I'll take a look and see what I can do.
For now, the only verified compatible version is 1.21.5 vanilla. If you download the 1.21.6 (also vanilla) mappings from the Mojang website and run the Python script to format them into JSON, ready for DarkClient, then the new version can also be used.
Another issue with Lunar is that it likely uses different mappings than Mojang. So, you'd need to get those and format them into JSON correctly as well

[athinaslime]

I have university exams right now. As soon as I'm done, I'll take a look and see what I can do. For now, the only verified compatible version is 1.21.5 vanilla. If you download the 1.21.6 (also vanilla) mappings from the Mojang website and run the Python script to format them into JSON, ready for DarkClient, then the new version can also be used. Another issue with Lunar is that it likely uses different mappings than Mojang. So, you'd need to get those and format them into JSON correctly as well

i don't think its the mappings, i launched 1.21.5 vanilla through the lunar client launcher which launches it just as any other launcher but it still adds the flag, it still didn't inject

[TheDarkSword]

No, no, I know the mappings aren't the problem (or at least not at this stage). I attach the agent loader via JVMTI, but I didn't consider that some clients, like Lunar, have protections against that. I'll need to modify my approach and use a different strategy, perhaps by injecting the library in another way, but that would require running the injector as an administrator. I'll look into it

[athinaslime]

No, no, I know the mappings aren't the problem (or at least not at this stage). I attach the agent loader via JVMTI, but I didn't consider that some clients, like Lunar, have protections against that. I'll need to modify my approach and use a different strategy, perhaps by injecting the library in another way, but that would require running the injector as an administrator. I'll look into it

okay nice thanks.

[cubewhy]

Lunar has no protections against anything

edit: I haven't read this issue carefully before, DisableAttachMechanism is effecting this problem

If you want to launch without this parameter, you can try the Celestial Launcher

[TheDarkSword]

That flag doesn't allow the agent to load. I don't think its custom ClassLoader affects DarkClient's proper functioning. In theory, I'd have to change the injection method from JVMTI to a more "brute-force" one, using ptrace on Linux and dll-syringe for Windows. However, this requires the injector to have administrator/sudo permissions (which I think is acceptable).

[cubewhy]

That flag doesn't allow the agent to load. I don't think its custom ClassLoader affects DarkClient's proper functioning. In theory, I'd have to change the injection method from JVMTI to a more "brute-force" one, using ptrace on Linux and dll-syringe for Windows. However, this requires the injector to have administrator/sudo permissions (which I think is acceptable).

Yes, that's right

I'm sorry about that I haven't look the issue closely

[cubewhy]

BTW,

My friend told me a way to attach an agent without enable the attach api

I haven't tested this hack yet, you can test it

[TheDarkSword]

This code seems to work after the library is injected (either at application startup or at runtime). In fact, it has the DllMain method, which is called when the library is loaded. This library then loads another library (which is what I do with my agent_loader crate)

[TheDarkSword]

Hello @athinaslime, I changed the injection method on Linux to use ptrace instead of JVMTI, but with Lunar Client there are some problems because it does not use vanilla obfuscation mappings.
If you know some working mappings that use Lunar Client I can adapt the application, instead there is nothing I can do

[cubewhy]

Hello @athinaslime, I changed the injection method on Linux to use ptrace instead of JVMTI, but with Lunar Client there are some problems because it does not use vanilla obfuscation mappings. If you know some working mappings that use Lunar Client I can adapt the application, instead there is nothing I can do

it's inside lunar's jar files

[TheDarkSword]

I checked the start command but it loads a file named "genesis-***.jar" that is obfuscated.
If I try to inject the client it can't find the "fue" class that is the Minecraft class in 1.21.8 mappings

[cubewhy]

I checked the start command but it loads a file named "genesis-***.jar" that is obfuscated. If I try to inject the client it can't find the "fue" class that is the Minecraft class in 1.21.8 mappings

It's not inside the genesis jar

You may checkout other random jars

BTW, lunar use a custom mapping called kin

You may need this to parse it

Weave-MC/Weave-Loader@3de51f6