About

This is an experimental modding project for arrasio.

Features

Reading/writing packets functionality.

• Read incoming packets.
• Modify incoming packets. cant make packet longer though :(
• Send arbritrary packets at any time.
• Modify incoming packets "arbritrarily".

idk

• Provide a mechanism for rendering extra gui on the screen like buttons, text, text input box.

QOL toggle various gui things feature.

• Intercept keyboard/mouse input.
• Figure out how to toggle the stuff like minimap, leaderboard, and player bar.
• Press M to toggle minimap.
• Press L to toggle leaderboard.
• Press N to toggle player bar.

QOL dim feature.

• Read information about player, like what color you are.
• Make tanks of same color as you dimmer.

Low-Level Goals

• Figure out how the big function branches works...
• Figure out what are the first things to happen when arras boots up...
• How do i modify packets to a different length...
• Make a mechanism to detect keyboard/mouse input.
• Make a mechanism to render stuff on screen.
• Make a simple heap allocator.
• Make a tool that replaces a region of arras memory with some custom data and then can return it back to how it was before replacing it.
• Object oriented stuff?
• Make a custom packet parser/writer?
• Upgrade the injection script so its very easy to inject any code...

Development

This project uses nix to handle package dependencies, so your gonna need to install nix before doing any development. Any time I open a new terminal i run sh scripts/shell.sh so it adds all the packages i need to the environment path. "Just do it"®.

1. Next you run sh scripts/mitmproxy.sh so we can override arrasio's app.wasm and index.html with out own. Those are in the mitmoverride directory. You have to change your browser's settings to point to the mitmproxy and do some extra stuff to intercept https traffic (which you need for arrasio. see Mitmproxy Getting Started).
2. Next (in a new terminal cus the other one has mitmproxy open), if im making changes to any injected code i run sh injectBuild.sh inside the scripts directory to rebuild the app.wasm and index.html.
3. Go back to 2.
4. ???
5. Profit.

Helpful Readings

• Compiling C to WebAssembly without Emscripten by Surma (this one was a godsend): Some explanations about clang and compiling to web assembly.

• WebAssembly Specification: This is useful for clarifying any details about web assembly *.wat(text format) and *.wasm(binary format) files.

• What’s in that .wasm? Introducing: wasm-decompile by Wouter van Oortmerssen: An explanation of how to read src/app.decomp(see scripts/build.sh to see how it is generated).

• coderundebug.com/learn/wat/introduction by Stephen Paul Hassall: This has some simple explanations for some web assembly concepts/instructions.

Copyright Stuff

I copied portions of code from musl. I put that code into these files: inject/src/poopstrings.c|poopmath.c, inject/include/poopstrings.h|poopint.h|poopmath.h.

The copyright notice that musl provided is in the file "MUSL_COPYRIGHT".