rust-kres

This crate provids a safe interface for Knot Resolver library (libkres). libkres is an implementation of a full DNS recursive resolver, including cache and DNSSEC validation. It doesn't require a specific I/O model and instead provides a generic interface for pushing/pulling DNS messages until the request is satisfied.

Example:

```rust use std::net::{SocketAddr, UdpSocket}; use kres::{Context, Request, State};

// DNS message wire format let question = [2, 104, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1]; let from_addr = "127.0.0.1:1234".parse::().unwrap();

let context = Context::new(); let req = Request::new(context.clone()); let mut state = req.consume(&question, from_addr);

// Process the subrequests while state == State::PRODUCE { state = match req.produce() { Some((msg, addr_set)) => {

        // This can be any I/O model the application uses
        let mut socket = UdpSocket::bind("0.0.0.0:0").unwrap();
        socket.send_to(&msg, &addr_set[0]).unwrap();
        let mut buf = [0; 512];
        let (amt, src) = socket.recv_from(&mut buf).unwrap();

        // Pass the response back to the request
        req.consume(&buf[..amt], src)
    },
    None => {
        break;
    }
}

}

// Convert request into final answer let answer = req.finish(state).unwrap(); ```