libwebsockets - html and http headers parsing fuzz targets

[Segwaz]

Extends fuzzing for libwebsockets to cover:

• HTML parsing (lws_lhp_parse)
• HTTP headers parsing (lws_parse)

Those additions increase static coverage from 2% to 42%.

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[github-actions]

Segwaz is a new contributor to projects/libwebsockets. The PR must be approved by known contributors before it can be merged. The past contributors are: lws-team, autofuzzoss

[DavidKorczynski]

just so I understand, are you a maintainer of libwebsockets? otherwise, could you reach out to maintainers to help them review the PR?

Ideally we should get these harnesses into the upstrem libwebsockets repository, could you please assist with this instead of landing the code here?

[Segwaz]

I am not a maintainer. I can make the necessary changes once they approve, provided there isn’t a specific reason to keep the current approach.

[Segwaz]

Hi @lws-team , could you please review this PR and confirm if moving the harnesses into the upstream libwebsockets repository would be acceptable?

[Segwaz]

Hi @lws-team , I wanted to follow up on this PR and share the updates I’ve made:

• The harnesses have been tested continuously for over 24 hours to ensure stability
• A bug in the lws_parse_fuzzer logic has been fixed
• Commented and unused code has been removed

The PR has been updated accordingly. I’d greatly appreciate your feedback whenever you have the time.