user_net is a toy userspace linux networking stack written completely in Rust.
I've recently finished this fantastic course on computer networking and thought it'd be a fun exercise to put together everything I learnt into practice.
[https://www.youtube.com/playlist?list=PLEAYkSg4uSQ2dr0XO_Nwa5OcdEcaaELSG]
Also, being a full-time back-end web developer writing mostly Ruby, I've always wanted to master this arcane art of "systems programming"; So what better way to get started than writing the networking stack yourself :D.
As someone who has just started out doing systems programming(and Rust :D), I'm pretty confident that I've made some pretty nasty mistakes and gone along with some bad design patterns. So pull requests are always welcome.
- IP packet fragmenting
- TCP/IP
- Add unit tests and integration tests
- Tons of otherstuff :D
- ARP request and reply
- ICMP echo replies
- UDP client and server
- Loopback behaviour
A simple UDP client server is shown below.
use user_net;
use std::thread;
fn main() {
user_net::start_stack();
std::thread::spawn(|| {
start_client()
});
start_server()
}
fn start_server() {
let server = user_net::udp_socket::bind("10.0.0.2:5055").unwrap();
let bytes = "Hello from the server".as_bytes();
loop {
let mut buf = Vec::with_capacity(1000);
let (num_bytes, from) = server.recv_from(&mut buf).unwrap();
println!("<Server> client says: {}", std::str::from_utf8(&buf).unwrap());
server.send_to(bytes, &from);
}
}
fn start_client() {
let client = user_net::udp_socket::bind("10.0.0.2:4055").unwrap();
client.connect("10.0.0.2:5055").unwrap();
let bytes = "Hello from the client".as_bytes();
loop{
let mut buf = Vec::with_capacity(1000);
client.send(bytes).unwrap();
client.recv_from(&mut buf).unwrap();
println!("<Client> server says: {}", std::str::from_utf8(&buf).unwrap());
}
}
