149 lines
3.5 KiB
Rust
149 lines
3.5 KiB
Rust
use crate::prelude::*;
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#[derive (Clone)]
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struct Params {
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common: app_common::Params,
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bind_addrs: Vec <Ipv4Addr>,
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nickname: String,
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our_mac: Option <[u8; 6]>,
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}
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pub async fn server <I: Iterator <Item=String>> (args: I) -> Result <(), AppError>
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{
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match get_mac_address() {
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Ok(Some(ma)) => {
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println!("Our MAC addr = {}", ma);
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}
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Ok(None) => println!("No MAC address found."),
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Err(e) => println!("{:?}", e),
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}
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let params = configure (args)?;
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let socket = UdpSocket::bind (SocketAddrV4::new (Ipv4Addr::UNSPECIFIED, params.common.server_port)).await?;
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for bind_addr in ¶ms.bind_addrs {
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if let Err (e) = socket.join_multicast_v4 (params.common.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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serve_interface (params, socket).await?;
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Ok (())
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}
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fn configure <I: Iterator <Item=String>> (mut args: I) -> Result <Params, AppError>
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{
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let common = app_common::Params::default ();
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let mut bind_addrs = vec![];
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let mut nickname = String::new ();
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if let Some (proj_dirs) = find_project_dirs () {
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let mut ini = Ini::new_cs ();
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let path = proj_dirs.config_dir ().join ("server.ini");
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if ini.load (&path).is_ok () {
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if let Some (x) = ini.get ("server", "nickname") {
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nickname = x;
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eprintln! ("Loaded nickname {:?}", nickname);
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}
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}
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else {
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eprintln! ("Can't load ini from {:?}, didn't load default configs", path);
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}
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}
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else {
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eprintln! ("Can't find config dir, didn't load default configs");
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}
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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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"--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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if bind_addrs.is_empty () {
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println! ("No bind addresses given, auto-detecting all local IPs");
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bind_addrs = get_ips ()?;
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}
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Ok (Params {
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common,
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bind_addrs,
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nickname,
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our_mac,
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})
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}
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async fn serve_interface (
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params: Params,
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socket: UdpSocket,
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)
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-> Result <(), AppError>
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{
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let mut recent_idem_ids = Vec::with_capacity (32);
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loop {
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println! ("Listening...");
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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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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 (params.our_mac),
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Message::Response2 (message::Response2 {
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idem_id,
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nickname: params.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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