122 lines
2.8 KiB
Rust
122 lines
2.8 KiB
Rust
use crate::prelude::*;
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struct ServerResponse {
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mac: Option <[u8; 6]>,
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nickname: Option <String>,
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}
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pub async fn client <I : Iterator <Item=String>> (mut args: I) -> Result <(), AppError> {
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use rand::RngCore;
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let common_params = app_common::Params::default ();
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let mut bind_addrs = vec! [];
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let mut timeout_ms = 500;
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while let Some (arg) = args.next () {
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match arg.as_str () {
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"--bind-addr" => {
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bind_addrs.push (match args.next () {
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None => return Err (CliArgError::MissingArgumentValue (arg).into ()),
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Some (x) => Ipv4Addr::from_str (&x)?,
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});
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},
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"--timeout-ms" => {
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timeout_ms = match args.next () {
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None => return Err (CliArgError::MissingArgumentValue (arg).into ()),
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Some (x) => u64::from_str (&x)?,
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};
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},
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_ => return Err (CliArgError::UnrecognizedArgument (arg).into ()),
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}
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}
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if bind_addrs.is_empty () {
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bind_addrs = get_ips ()?;
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}
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let socket = UdpSocket::bind (SocketAddrV4::new (Ipv4Addr::UNSPECIFIED, 0)).await?;
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for bind_addr in bind_addrs {
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if let Err (e) = socket.join_multicast_v4 (common_params.multicast_addr, bind_addr) {
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println! ("Error joining multicast group with iface {}: {:?}", bind_addr, e);
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}
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}
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let mut idem_id = [0u8; 8];
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rand::thread_rng ().fill_bytes (&mut idem_id);
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let msg = Message::Request1 {
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idem_id,
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mac: None,
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}.to_vec ()?;
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let socket = Arc::new (socket);
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let socket2 = Arc::clone (&socket);
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tokio::spawn (async move {
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for _ in 0..10 {
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socket2.send_to (&msg, (common_params.multicast_addr, common_params.server_port)).await?;
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sleep (Duration::from_millis (100)).await;
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}
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Ok::<_, AppError> (())
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});
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let mut peers = HashMap::with_capacity (10);
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timeout (Duration::from_millis (timeout_ms), listen_for_responses (&*socket, &mut peers)).await.ok ();
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let mut peers: Vec <_> = peers.into_iter ().collect ();
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peers.sort_by_key (|(_, v)| v.mac);
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println! ("Found {} peers:", peers.len ());
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for (ip, resp) in peers.into_iter () {
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let mac = match resp.mac {
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None => {
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println! ("<Unknown> = {}", ip);
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continue;
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},
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Some (x) => x,
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};
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let nickname = match resp.nickname {
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None => {
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println! ("{} = {}", MacAddress::new (mac), ip.ip ());
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continue;
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},
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Some (x) => x,
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};
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println! ("{} = {} `{}`", MacAddress::new (mac), ip.ip (), nickname);
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}
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Ok (())
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}
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async fn listen_for_responses (
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socket: &UdpSocket,
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peers: &mut HashMap <SocketAddr, ServerResponse>
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) {
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loop {
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let (msgs, remote_addr) = match recv_msg_from (socket).await {
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Err (_) => continue,
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Ok (x) => x,
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};
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let mut resp = ServerResponse {
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mac: None,
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nickname: None,
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};
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for msg in msgs.into_iter () {
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match msg {
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Message::Response1 (x) => resp.mac = x,
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Message::Response2 (x) => resp.nickname = Some (x.nickname),
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_ => (),
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}
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}
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peers.insert (remote_addr, resp);
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}
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}
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