PyJoern

A Python frontend and lifter for Joern API, focused on CFG manipulation.

Install

This package requires you to have Java 19, Graphviz, and Unzip installed on your machine before running the pip installer. In you don't have them on your system, use the install_dependencies.sh script found in the source repo.

pip3 install pyjoern && pyjoern --install

Running pyjoern --install will init the Joern package for this first time, which will download the backend.

Usage

Use PyJoern as a library for collecting info on source and getting a CFG. The IL the source CFG is lifted to is described in JIL.

from pyjoern import parse_source, fast_cfgs_from_source

# for full parsing
functions = parse_source("tests/source/simple.c")
main = functions["main"]
print(main.start_line)
print(main.cfg)

# for only the CFG
cfgs = fast_cfgs_from_source("tests/source/simple.c")
main_func = cfgs["main"]
print(main_func.edges)

See the tests for more examples of how to use PyJoern.

Versioning

The current version of PyJoern can be found in [pyjoern/__init__.py] as __version__. The point in the version is the PyJoern specific updates. The first three are the current version of Joern that PyJoern is supporting.

Example:

__version__ = "v1.2.18.1"

This would mean Joern version v1.2.18, with PyJoern update 1.