FunctionID: Add AddSingleFunction.java Ghidra script

[gemesa]

Fixes #5212

Introduction

As described in the linked issue there is currently no way to add a single function to a FID DB which is something I have wanted for a long time as well. The Ghidra script AddSingleFunction.java now implements this functionality.

Overview of the script

Prerequisites:

• A FID DB must be created and attached.
• An address must be selected in the listing view.

The script checks if there is any available library in the FID DB. If a library exists the user can select it. If not the user will be prompted to create one. The user can then decide whether to preserve the namespaces of the selected function or save only the basename. Finally the function entry is saved.

Testing

Empty FID DB (create new library)

Select a function (rayon::main):

Run AddSingleFunction.java:

List the FID DB content with ListFunctions.java:

$ cat fid-list.txt
rust-rayon rust_rayon::main

Non-empty FID DB (already contains at least one library)

Select a function (crossbeam_deque::deque::Stealer<T>::steal):

Run AddSingleFunction.java:

List the FID DB content with ListFunctions.java:

$ cat fid-list.txt
rust-rayon crossbeam_deque::deque::Stealer<T>::steal
rust-rayon rust_rayon::main

Additional notes

I had to make FidServiceLibraryIngest and findTerminator() public because they are required to calculate hasTerminator which is passed to createNewFunction(). If this is not allowed let me know and I will duplicate findTerminator() instead.