Open Slinky
by Skid Solutions
credits to cat;

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https://discord.gg/AEwatvnvSf

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About

Open Slinky is a readable C++ reconstruction of the Slinky client for Minecraft 1.8.9. The client is injected into the game process as a native DLL; it hooks the game at the Java bytecode level through JVMTI, dispatches events to the module system, and renders its interface through NanoVG.

This edition is cleaned up for development:

• address-based file and function names have been replaced with descriptive ones; the original symbols are recorded in docs/symbol-map.json (functions) and docs/global-symbol-map.json (data_<rva> / rdata_<rva> globals and the *_part event handlers), and inferred names are listed in docs/renames.md;
• assembly used only for byte-exact code generation has been removed; the remaining asm tokens are symbol aliases, not instructions;
• the client's data tables remain in src/data because the code links against them (fonts, strings, module descriptors).

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How to build

Prerequisites

• LLVM — clang-cl, lld-link, llvm-rc and llvm-mt on PATH
• CMake 3.20 or newer
• Ninja
• Windows x64
• Java Development Kit 8 — runtime for Minecraft 1.8.9; not required to compile the DLL

1. Configure

cmake -S . -B build -G Ninja `
  -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-windows-clang-cl.cmake

If Ninja is not on PATH, add -DCMAKE_MAKE_PROGRAM=C:/path/to/ninja.exe.

2. Build

cmake --build build

Output:

• build/slinky.dll

Running

Inject slinky.dll into the running Minecraft 1.8.9 process with LoadLibrary. Start-up runs on its own thread; the client interface is opened with its GUI key. The last interface tab unloads the client: it saves the settings, removes the Java hooks and frees the library.

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Project layout

src/engine/         hooks, JNI/JVMTI, GUI, module manager, math, shared services
src/logic/          per-module behaviour (.cpp) and its descriptor callbacks / settings page (.h)
src/platform/       Windows layer, GL loader, NanoVG integration
src/data/           data tables (fonts, strings, descriptors) - required to link
include/slinky/     public headers
docs/               design notes and the symbol map
third_party/        NanoVG and GL headers

Notes

• Start-up, teardown, the window hook and the unload thread were virtualised in the original image and are reconstructed in src/engine/protected/.
• docs/symbol-map.json maps every original fn_<rva>, logic_<rva>, cb_<rva>, reg_<rva> and aux_<rva> symbol to its readable name.
• Settings and profiles are stored in ~/.slinky (settings, profiles/).
• src/data/*.s and src/platform/win/chkstk.s are data/compiler-support sections, not client code, this is 1 to 1 logic but may have some issues that we didnt find.

Credits

• Original client: Slinky
• Reconstruction: Claude (VMProtect devirtualization), DeepSeek (decryption), GLM and Claude (symbol recovery)

Legal & disclaimers

• Affiliation: This is an independent development. It is NOT AN OFFICIAL SLINKY PRODUCT, is not approved by or associated with the original authors, and is not affiliated with Mojang or Zelix Pty Ltd.
• Assets & code: No un-obfuscated original source code is distributed directly within this repository. The src/data tables are the client's own data required for linking; all third-party assets and code belong to their respective owners.
• Purpose: research and preservation. Use at your own risk.