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Add parsing of .NET user types from .NET metadata stream #1605

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merged 9 commits into from
Jun 23, 2022

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HoundThe
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@HoundThe HoundThe commented Dec 6, 2021

This PR introduces parsing of the user-defined types from the .NET metadata tilde stream. It extracts class names, base types, modifiers, methods with their return types. arguments, etc. (more in the docs). I've been testing the modification with IL/DnSpy and RetDec.

For better code readability and maintainability, as it includes many string concatenations, I've created a simple string-like type in the libyara, that allows me to work with variable strings.

I've also noticed that Bazel tests do not include test-dotnet.c. I wasn't sure why, so I've included it.

I've also included some binary with .NET user type metadata to have something to write tests with, I am not sure what the policy is with including another binary to the testing sample.

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@plusvic plusvic added this to the v4.3 milestone Jan 10, 2022
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Thanks for the feedback! Sorry for the delay, I was finishing the last few exams past week.

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I've noticed the test failing on misaligned load and changed the reading functions to work byte-by-byte.

@HoundThe HoundThe requested a review from plusvic June 22, 2022 11:00
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plusvic commented Jun 23, 2022

I sent a PR to your branch with a proposal for fixing the same issues: HoundThe#1

I prefer using the yr_unaligned_uXX functions, which make the intention clearer.

* Fix unaligned memory access.

* Add missing comma in Bazel file.
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Oh thanks, I didn't notice the PR on my fork, didn't get any notifications about it. I've undone my commit and merged your PR, didn't know about unaligned.h

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