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Currently, packets for allocations, i.e. from relays are parsed inside the `Allocation` struct. We have one of those structs for each relay that `snownet` is talking to. When we disconnect from a relay because it is e.g. not responding, then we deallocate this struct. As a result, message that arrive from this relay can no longer be handled. This can happen when the response time is longer than our timeout. These packets then fall-through and end up being logged as "packet has unknown format". To prevent this, we make the signature on `Allocation` strongly-typed and expect a fully parsed `Message` to be given to us. This allows us to parse the message early and discard it with a DEBUG log in case we don't have the necessary local state to handle it. The functionality here is essentially the same, we just change at what level this is being logged at from WARN to DEBUG. We have to make one additional adjustment to make this work: Guard all messages to be parsed by any `Allocation` to come from port 3478. This is the assigned port that all relays are expected to listen on. If we don't have any local state for a given address, we cannot decide whether it is a STUN message for an agent or a STUN message for a relay that we have disconnected from. Therefore, we need to de-multiplex based on the source port.
Connlib
Firezone's connectivity library shared by all clients.
Building Connlib
You shouldn't need to build connlib directly; it's typically built as a dependency of one of the other Firezone components. See READMEs in those directories for relevant instructions.