send_udp_message.rs

use tokio::net::UdpSocket;
use std::net::{Ipv4Addr, SocketAddrV4};

pub async fn send_udp_message() {
  let google_dns = Ipv4Addr::new(8, 8, 8, 8);
  let buffer = &[
    32, 189, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 4, 101, 54, 55, 51, 5, 100, 115, 99, 101, 57, 10, 97,
    107, 97, 109, 97, 105, 101, 100, 103, 101, 3, 110, 101, 116, 0, 0, 65, 0, 1,
  ];

  let socket = UdpSocket::bind((Ipv4Addr::new(0, 0, 0, 0), 0))
    .await
    .unwrap();
  socket
    .connect(SocketAddrV4::new(google_dns, 53))
    .await
    .unwrap();
  socket.send(buffer).await.unwrap();

  let mut response_bytes = [0; 4096];
  let response_length = socket.recv(&mut response_bytes).await.unwrap();

  let response = &response_bytes[0..response_length];
  println!("{:?}", response);
}