flex-exercise

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About

This is an example Cydia Substrate tweak exercise for FLEX.

FLEX (Flipboard Explorer) is a set of in-app debugging and exploration tools for iOS development.

This tweak allows you to inspect some internals of Apple's Mail.app

Folder Structures

├── README.markdown // this file
├── builds
│   └── in.fourplex.flextweak_0.0.1-5_iphoneos-arm.deb  // example deb file
│── misc // something you may need
└── src
    ├── Tweak.xm  //tweak for Mail.app
    ├── Tweak2.xm //tweak for SpringBoard
    ├── include
    │   └── FLEX  //FLEX Header files 
    └── lib
       └── libflex.a //FLEX static library

Demo

• show FLEX after application started
• 3 fingers, tap twice to activate it.

How it works?

MobileLoader(a Cydia Substrate component) will first load itself into the run application using DYLD_INSERT_LIBRARIES environment variable. Then it looks for all dynamic libraries in the directory /Library/MobileSubstrate/DynamicLibraries/, and dlopen them.

You can find it more details here and I also summarized a wiki page all about this kind of stuff. Go and checkout them if you like, :).

How to build

• install theos, rpetrich's fork
• brew install dpkg coreutils gnu-tar
• make package && make install (You need a jailbroken device)