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Currently, the DNS records for the portal's hostname are only resolved during startup. When the WebSocket connection fails, we try to reconnect but only with the IPs that we have previously resolved. If the local IP stack changed since then or the hostname now points to different IPs, we will run into the reconnect-timeout configured in `phoenix-channel`. To fix this, we re-resolve the portal's hostname every time the WebSocket connection fails. For the Gateway, this is easy as we can simply reuse the already existing `TokioResolver` provided by hickory. For the Client, we need to write our own DNS client on top of our socket factory abstraction to ensure we don't create a routing loop with the resulting DNS queries. To simplify things, we only send DNS queries over UDP. Those are not guaranteed to succeed but given that we do this on every "hiccup", we already have a retry mechanism. We use the currently configured upstream DNS servers for this. Resolves: #10238
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.