Add a borrowing cmsg api #2646
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Add a borrowing cmsg api #2646
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This is mainly to support implementing custom control messages.
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What does this PR do
Adds a raw cmsg access api to the CmsgIterator. The goal is to bypass ControlMessageOwned which is marked non_exhaustive.
The SCTP messages I'm currently parsing hit the catchall ControlMessageOwned::Uknown, but my code would break if nix changes what the Unknown variant covers in the future, hence why I'm looking to access the messages raw.
I don't know enough about *nix to know if it's safe to return &'a references to the cmsg header and value so instead I borrowed from self, returning 1 control message at a time.
The safety of the unsafe blocks I believe are exactly the same as what I copied from ControlMessageOwned::decode_from.
Checklist:
CONTRIBUTING.md