Strudra

Welcome to Strudra, a way to craft Ghidra structs in python, using ghidra_bridge.

Example

First, init Strudra - you can pass in a custom Ghidra Bridge here, if you like.

import strudra
sd = strudra.Strudra()

We can use all structs from Ghidra, but let's add one just for this example.

sd.add_struct("struct test{ int test1; char test2[2]; };")

Create a Strud

Now, we can access the new test struct from ghidra. We can alread set values in the constructor

test_struct = sd.test(test1=0x1337)

We can use struct members by name or by offset

assert (test_struct.test == test_struct[0x0])

Arrays work, too

test_struct.test2 = [0x42, 0x42]

At the end, we can get the serialized bytes back, all members the correct byte order, and use it for example in pwntools.

bytes(test_struct)

How studra works

Strudra loads all structs from the Ghidra For this to work, you have to setup ghidra_bridge in Ghidra: https://github.com/justfoxing/ghidra_bridge/

Then, you can create instances of these structs, set values in these structs, and edit them. Good if you want to interact with your target.