85 lines
2.2 KiB
Rust
85 lines
2.2 KiB
Rust
use crate::prelude::*;
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pub async fn server <I: Iterator <Item=String>> (mut args: I) -> Result <(), AppError>
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{
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let common_params = app_common::Params::default ();
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let mut bind_addr = "0.0.0.0".to_string ();
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let mut nickname = String::new ();
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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_addr = match args.next () {
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None => return Err (CliArgError::MissingArgumentValue (arg).into ()),
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Some (x) => x
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};
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},
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"--nickname" => {
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nickname = match args.next () {
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None => return Err (CliArgError::MissingArgumentValue (arg).into ()),
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Some (x) => 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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let our_mac = get_mac_address ()?.map (|x| x.bytes ());
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if our_mac.is_none () {
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println! ("Warning: Can't find our own MAC address. We won't be able to respond to MAC-specific lookaround requests");
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}
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let socket = UdpSocket::bind (SocketAddrV4::new (Ipv4Addr::from_str (&bind_addr)?, common_params.server_port)).await?;
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socket.join_multicast_v4 (common_params.multicast_addr, [0u8, 0, 0, 0].into ())?;
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let mut recent_idem_ids = Vec::with_capacity (32);
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loop {
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println! ("Waiting for messages...");
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let (req_msgs, remote_addr) = match recv_msg_from (&socket).await {
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Ok (x) => x,
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Err (e) => {
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println! ("Error while receiving message: {:?}", e);
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continue;
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},
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};
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let req = match req_msgs.into_iter ().next () {
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Some (x) => x,
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_ => {
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println! ("Don't know how to handle this message, ignoring");
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continue;
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},
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};
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let resp = match req {
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Message::Request1 {
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mac: None,
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idem_id,
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} => {
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if recent_idem_ids.contains (&idem_id) {
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println! ("Ignoring request we already processed");
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None
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}
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else {
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recent_idem_ids.insert (0, idem_id);
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recent_idem_ids.truncate (30);
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Some (vec! [
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Message::Response1 (our_mac),
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Message::Response2 (message::Response2 {
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idem_id,
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nickname: nickname.clone (),
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}),
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])
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}
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},
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_ => continue,
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};
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if let Some (resp) = resp {
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socket.send_to (&Message::many_to_vec (&resp)?, remote_addr).await?;
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}
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}
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}
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