kalli/FSHook
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FSHook/README.md
Daniel Kallendorf b3120b69b0 Initial
2022-11-10 00:06:01 +01:00

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Getting Started

Dependencies

  • FirstSpirit installation
  • OpenJDK11 (On Windows this gets installed together with FS C:/Users/<User>/.firstspirit/FSLauncher/jre/11.0.11/jre-win/jdk-11.0.11+9-jre/bin/java.exe)
  • AspectJ https://www.eclipse.org/aspectj/ (already included)
  • copy .firstspirit/FSLauncher/jar/*, .firstspirit_<version>/jars/* (usually located in $HOME) of the FS installation into lib/
  • Fix some FirstSpirit crap: open

Paths

  • <java> point to your (or FSs) OpenJDK11 installation
  • <aspectjweaver.jar> can be found in FSHook/tool
  • <classpath> points to lib/* and tool/*
  • The seperator is : on Linux and ; on Windows.

Building

java -cp <classpath> org.aspectj.tools.ajc.Main -sourceroots 'src/' -injars lib/fs-isolated-client-*.jar -outjar bin/uploadPlugin.jar -outxml -9 -Xlintfile .vscode/ajc.properties",

What the hell?

AspectJ is a bytecode manipulation framework. In our case the method Plugins.getPlugins(ServerConnection, Class, BaseContext) from de.espirit.firstspirit.client.plugin.Plugins gets overriden to load the plugins registered in com.kallendorf.fshook.CustomLoader.pluginsToLoad in addition to the default ones. This allows th execution of arbitrary code within the FirstSprit client.