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wtf is libsamp?

knogle/libsamp — explained in plain English

Analysis updated 2026-05-18

18CAudience · researcherComplexity · 5/5LicenseSetup · hard

TL;DR

An open-source, in-progress reimplementation of SA-MP's core client library, built through reverse engineering for compatibility research.

Mindmap

mindmap
  root((Libre SAMP))
    What it does
      Rebuilds samp dll
      Reverse engineering
      Drop in replacement goal
    Tech stack
      C
      CMake
      MinGW-w64
    Use cases
      Compatibility research
      Local server testing
      Software preservation
    Audience
      Researchers
      Developers
    Status
      Basic gameplay working
      Sync still in progress
      Evidence tagged docs

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Study how the proprietary SA-MP client library works through documented reverse engineering

REASON 2

Test a reimplemented multiplayer client library against local test servers

REASON 3

Preserve compatibility with an aging multiplayer mod as original binaries age

REASON 4

Use the included ASI probe to collect behavior traces for further reverse engineering

What's in the stack?

CCMakeNinjaMinGW-w64

How it stacks up

knogle/libsampalonsovm44/tc-langjayhutajulu1/cve-2026-43494-pintheft-poc
Stars181818
LanguageCCC
Setup difficultyhardmoderatehard
Complexity5/54/55/5
Audienceresearcherdeveloperresearcher

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · hard Time to first run · 1day+

Requires CMake, Ninja, and the MinGW-w64 cross-compiler, and the project is still incomplete for full gameplay.

Free to use, modify, and distribute under the MIT license, including for commercial purposes, as long as you keep the copyright notice.

Wtf does this do

Libre-SAMP is an experimental open-source reimplementation of a single file: the samp.dll that ships with SA-MP 0.3.7-R5. SA-MP (San Andreas Multiplayer) is a long-running multiplayer mod for the game Grand Theft Auto: San Andreas, and samp.dll is the core client library that handles networking, UI, vehicle sync, player rendering, and other multiplayer features. The goal here is to rebuild that file from scratch using reverse engineering, observed behavior traces, and public server-side references, so that it works as a drop-in replacement without depending on the original proprietary binary. The project is not a finished product. At the current development milestone, the replacement DLL can connect to local test servers, enter the gameplay state, handle basic chat and dialog flows, spawn a local player, create vehicles, display core HUD elements, and render a portion of the TextDraw system (the mechanism servers use to draw text and sprites on screen). Remote player synchronization, full RPC coverage, custom object loading, and several other subsystems are still in active development. Alongside the DLL itself, the repository includes an ASI probe, which is a separate plugin that loads into the game and collects instrumentation traces. Those traces feed the reverse engineering process, providing evidence about how the original DLL behaves so the reimplementation can match it. The code uses an evidence-tagging system in its documentation to mark each implementation detail as observed behavior, a static reference, an inference, or something still needing verification. Building from source requires CMake, Ninja, and the MinGW-w64 cross-compiler. The build runs on Linux and produces a Windows 32-bit DLL and ASI file. A continuous integration workflow on GitHub produces the same outputs and generates checksums. The vendored networking library used is a fork of RakNet, the protocol underlying SA-MP. The project is scoped to compatibility research, local testing, and software preservation. Using it on public servers to cheat or evade bans is outside its intended purpose. It is released under the MIT license.

Yoink these prompts

Prompt 1
Explain what parts of SA-MP's samp.dll this project has reimplemented so far
Prompt 2
Walk me through building this project from source with CMake and MinGW-w64
Prompt 3
Help me understand how the evidence-tagging system in the docs works
Prompt 4
What subsystems are still missing before this could be a full drop-in replacement

Frequently asked questions

wtf is libsamp?

An open-source, in-progress reimplementation of SA-MP's core client library, built through reverse engineering for compatibility research.

What language is libsamp written in?

Mainly C. The stack also includes C, CMake, Ninja.

What license does libsamp use?

Free to use, modify, and distribute under the MIT license, including for commercial purposes, as long as you keep the copyright notice.

How hard is libsamp to set up?

Setup difficulty is rated hard, with roughly 1day+ to a first successful run.

Who is libsamp for?

Mainly researcher.

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