YODALib

Your Only Decompiler API Library (YODALib)!

YODALib is an abstracted decompiler API that enables you to write plugins/scripts that work, with minimal edit, in every decompiler supported by YODALib.

Install

pip install -e .

Usage

YODALib exposes all decompiler API through the abstract class DecompilerInterface. The DecompilerInterface can be used in either the default mode, which assumes a GUI, or headless mode. In headless mode, the interface will start a new process using a specified decompiler.

UI Mode (default)

To use the same script everywhere, use the convenience function DecompilerInterface.discover_interface(), which will auto find the correct interface. Copy the below code into any supported decompiler and it should run without edit.

from yodalib.api import DecompilerInterface
deci = DecompilerInterface.discover_interface()
for function in deci.functions:
    if function.header.type == "void *":
        function.header.type = "long long"
    
    deci.functions[function.addr] = function

Headless Mode

To use headless mode you must specify a decompiler to use. You can get the traditional interface using the following:

from yodalib.api import DecompilerInterface
deci = DecompilerInterface.discover_interface(force_decompiler="ida", headless=True)

Artifact Access Caveats

In designing the dictionaries that contain all Artifacts in a decompiler, we had a clash between ease-of-use and speed. When accessing some artifacts like a Function, we must decompile the function. Decompiling is slow. Due to this issue we slightly changed how these dictionaries work to fast accessing.

The only way to access a full artifact is to use the getitem interface of a dictionary. In practice this looks like the following:

for func_addr, light_func in deci.functions.items():
    full_function = deci.function[func_addr]

Notice, when using the items function the function is light, meaning it does not contain stack vars and other info. This also means using keys, values, or list on an artifact dictionary will have the same affect.

TODO

G/S: Getters/Setters

• Add all decompilers to auto-detect interface

ALL

• Move hook-inits to inside the Interface creation for all decompilers?
  • This could cause issues. What happens when this is done twice?

IDA

• Change Callbacks
• G/S Comments

Binja

• Change Callbacks

Ghidra

• Generic Interface Outline & Stubs
• Every G/S
• Change Callbacks

angr

• Change Callbacks