d8cc4c7161
The last released version of `smoltcp` is `0.11.0`. That version is almost a year old. Since then, an important "bug" got fixed in the IPv6 handling code of `smoltcp`. In order to route packets to our interface, we define a dummy IPv4 and IPv6 address and create catch-all routes with our interface as the gateway. Together with `set_any_ip(true)`, the makes `smoltcp` accept any packet we pass it to. This is necessary because we don't directly connect `smoltcp` to the TUN device but rather have an `InMemoryDevice` where we explicitly feed certain packets to it. In the last released version, `smoltcp` only performs the above logic for IPv4. For IPv6, the additional check for "do we have a route that this packet matches" doesn't exist and thus no IPv6 traffic is accepted by `smoltcp`. Extracted out of #6944.
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.