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Applications may query domains for HTTPS RR using the HTTPS record type. `connlib` operates on OSI layer 3 and thus can only hand out IPs for the particular domains. The correct way to signal this to applications is to answer the HTTPS query with NOERROR and return an empty set of records. [RFC9460](https://www.rfc-editor.org/rfc/rfc9460.html#name-client-behavior) says the following: > 4. If one or more "compatible" ([Section 8](https://www.rfc-editor.org/rfc/rfc9460.html#mandatory)) ServiceMode records are returned, these represent the alternative endpoints. Sort the records by ascending SvcPriority. > 5. Otherwise, SVCB resolution has failed, and the list of available endpoints is empty. This implies that returning no records is valid behaviour and forces the client to consider the HTTPS DNS query as failed and query for A / AAAA records instead (if it didn't do so via happy-eyeballs already).
Rust development guide
Firezone uses Rust for all data plane components. This directory contains the Linux and Windows clients, and low-level networking implementations related to STUN/TURN.
We target the last stable release of Rust using rust-toolchain.toml.
If you are using rustup, that is automatically handled for you.
Otherwise, ensure you have the latest stable version of Rust installed.
Reading Client logs
The Client logs are written as JSONL for machine-readability.
To make them more human-friendly, pipe them through jq like this:
cd path/to/logs # e.g. `$HOME/.cache/dev.firezone.client/data/logs` on Linux
cat *.log | jq -r '"\(.time) \(.severity) \(.message)"'
Resulting in, e.g.
2024-04-01T18:25:47.237661392Z INFO started log
2024-04-01T18:25:47.238193266Z INFO GIT_VERSION = 1.0.0-pre.11-35-gcc0d43531
2024-04-01T18:25:48.295243016Z INFO No token / actor_name on disk, starting in signed-out state
2024-04-01T18:25:48.295360641Z INFO null
Benchmarking on Linux
The recommended way for benchmarking any of the Rust components is Linux' perf utility.
For example, to attach to a running application, do:
- Ensure the binary you are profiling is compiled with the
benchprofile. sudo perf perf record -g --freq 10000 --pid $(pgrep <your-binary>).- Run the speed test or whatever load-inducing task you want to measure.
sudo perf script > profile.perf- Open profiler.firefox.com and load
profile.perf
Instead of attaching to a process with --pid, you can also specify the path to executable directly.
That is useful if you want to capture perf data for a test or a micro-benchmark.