StellarKey

A DLC unlocker for Steam games on Linux. So far it's only been tested on a few games. It should work on most games with some minor tweaking.

Download the latest release or compile with make. Then run your game with the LD_PRELOAD environment variable like:

cd /path/to/your/game
LD_PRELOAD=/path/to/libstellarkey.so ./game

Or set Steam launch options:

LD_PRELOAD="/path/to/libstellarkey.so:$LD_PRELOAD" %command%

Inspired by hookey and CreamAPI. Thanks to Goldberg Emulator for his reference implementation of the Steam API. An open source Patches welcome.

Configuration

StellarKey will unlock all DLC for most games, but in case this auto-detection does not work, StellarKey will look for a configuration file called DLC.txt or cream_api.ini in the game's working directory, or inside a steam_settings directory if no configuration files were found outside. The format is like this:

12345 = "DLC Name"
67890=Another DLC

With optional spaces and double quotes. So simple configuration files from Goldberg Emulator or CreamAPI will work with no modifications. However, unlike these, StellarKey does not currently look for configuration files in the directory where libstellarkey.so is located.

Additionally you can set the STELLARKEY_DIR environment variable to make StellarKey look for configuration files anywhere else. For example you could set the Steam launch options like this:

STELLARKEY_DIR="${HOME}/sk_config/${SteamAppId}/" LD_PRELOAD="/path/to/libstellarkey.so:$LD_PRELOAD" %command%

And then store the configuration files for the game with AppId 12345 in ~/sk_config/12345/.

My game does not work

When reporting a game that StellarKey does not work for, please provide a log file, a link to the game's data and instructions to make it work on the Goldberg emulator. StellarKey will log its actions to a file if you run it with the environment variable STELLARKEY_LOG="/tmp/stellarkey.log" or if you compile it with make clean; make debug.

TODO

• A few games use unorthodox ways to check for unlockables, such as GetInstalledDepots, IsUserInSource, GetAppInstallDir, UserHasLicenseForApp, mods, inventory, and so on. Find games that do this and implement these and other functions.
• Move away from libstdc++, it's huge and causes problems with symbol clashes.
• Somebody that actually knows C++ should take a look at this and make it more idiomatic.
• Unity games using Steamworks.NET find the SteamApps interface using dlsym. Hook dlsym itself to make Stellarkey work with these. A complication is that dlsym reads the stack to implement RTLD_NEXT, so the implementation of the hook will need to jump to the real dlsym in assembly without messing up the stack.
• Move over to LD_AUDIT instead of LD_PRELOAD. It looks like it would solve the problems with symbol clashes and dlsym.
• Mac OS port.
• Find a way to unlock all DLC automatically in games that query a list from the Steam API. Maybe simply ask SteamDB over http.
• Support games using the Proton compatibility layer. Research how those games talk to the native Steam client, and if it's possible to hook wine libraries with LD_PRELOAD.