rustdesk-server/src/rendezvous_server.rs

use crate::common::*;
use crate::peer::*;
use hbb_common::{
    allow_err,
    bytes::{Bytes, BytesMut},
    bytes_codec::BytesCodec,
    futures::future::join_all,
    futures_util::{
        sink::SinkExt,
        stream::{SplitSink, StreamExt},
    },
    log,
    protobuf::{Message as _, MessageField},
    rendezvous_proto::{
        register_pk_response::Result::{TOO_FREQUENT, UUID_MISMATCH},
        *,
    },
    tcp::{new_listener, FramedStream},
    timeout,
    tokio::{
        self,
        io::{AsyncReadExt, AsyncWriteExt},
        net::{TcpListener, TcpStream},
        sync::{mpsc, Mutex},
        time::{interval, Duration},
    },
    tokio_util::codec::Framed,
    udp::FramedSocket,
    AddrMangle, ResultType,
};
use sodiumoxide::crypto::sign;
use std::{
    collections::HashMap,
    net::{IpAddr, Ipv4Addr, SocketAddr},
    sync::Arc,
    time::Instant,
};
const ADDR_127: IpAddr = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));

#[derive(Clone, Debug)]
enum Data {
    Msg(RendezvousMessage, SocketAddr),
    RelayServers0(String),
    RelayServers(RelayServers),
}

const REG_TIMEOUT: i32 = 30_000;
type TcpStreamSink = SplitSink<Framed<TcpStream, BytesCodec>, Bytes>;
type WsSink = SplitSink<tokio_tungstenite::WebSocketStream<TcpStream>, tungstenite::Message>;
enum Sink {
    TcpStream(TcpStreamSink),
    Ws(WsSink),
}
type Sender = mpsc::UnboundedSender<Data>;
type Receiver = mpsc::UnboundedReceiver<Data>;
static mut ROTATION_RELAY_SERVER: usize = 0;
type RelayServers = Vec<String>;
static CHECK_RELAY_TIMEOUT: u64 = 3_000;
static mut ALWAYS_USE_RELAY: bool = false;

#[derive(Clone)]
pub struct RendezvousServer {
    tcp_punch: Arc<Mutex<HashMap<SocketAddr, Sink>>>,
    pm: PeerMap,
    tx: Sender,
    relay_servers: Arc<RelayServers>,
    relay_servers0: Arc<RelayServers>,
    serial: i32,
    rendezvous_servers: Arc<Vec<String>>,
    version: String,
    software_url: String,
    sk: Option<sign::SecretKey>,
}

enum LoopFailure {
    UdpSocket,
    Listener3,
    Listener2,
    Listener,
}

impl RendezvousServer {
    #[tokio::main(flavor = "multi_thread")]
    pub async fn start(
        port: i32,
        serial: i32,
        key: &str,
        rmem: usize,
    ) -> ResultType<()> {
        let addr = format!("0.0.0.0:{}", port);
        let addr2 = format!("0.0.0.0:{}", port - 1);
        let addr3 = format!("0.0.0.0:{}", port + 2);
        let pm = PeerMap::new().await?;
        log::info!("serial={}", serial);
        let rendezvous_servers = get_servers(&get_arg("rendezvous-servers"), "rendezvous-servers");
        log::info!("Listening on tcp/udp {}", addr);
        log::info!("Listening on tcp {}, extra port for NAT test", addr2);
        log::info!("Listening on websocket {}", addr3);
        let mut socket = FramedSocket::new_with_buf_size(&addr, rmem).await?;
        let (tx, mut rx) = mpsc::unbounded_channel::<Data>();
        let software_url = get_arg("software-url");
        let version = hbb_common::get_version_from_url(&software_url);
        if !version.is_empty() {
            log::info!("software_url: {}, version: {}", software_url, version);
        }
        let mut rs = Self {
            tcp_punch: Arc::new(Mutex::new(HashMap::new())),
            pm,
            tx: tx.clone(),
            relay_servers: Default::default(),
            relay_servers0: Default::default(),
            serial,
            rendezvous_servers: Arc::new(rendezvous_servers),
            version,
            software_url,
            sk: None,
        };
        let key = rs.get_server_sk(key);
        std::env::set_var("PORT_FOR_API", port.to_string());
        rs.parse_relay_servers(&get_arg("relay-servers"));
        let pm = rs.pm.clone();
        let mut listener = new_listener(&addr, false).await?;
        let mut listener2 = new_listener(&addr2, false).await?;
        let mut listener3 = new_listener(&addr3, false).await?;
        let test_addr = std::env::var("TEST_HBBS").unwrap_or_default();
        if std::env::var("ALWAYS_USE_RELAY")
            .unwrap_or_default()
            .to_uppercase()
            == "Y"
        {
            unsafe {
                ALWAYS_USE_RELAY = true;
            }
        }
        log::info!(
            "ALWAYS_USE_RELAY={}",
            if unsafe { ALWAYS_USE_RELAY } {
                "Y"
            } else {
                "N"
            }
        );
        if test_addr.to_lowercase() != "no" {
            let test_addr = (if test_addr.is_empty() {
                addr.replace("0.0.0.0", "127.0.0.1")
            } else {
                test_addr
            })
            .parse::<SocketAddr>()?;
            tokio::spawn(async move {
                allow_err!(test_hbbs(test_addr).await);
            });
        };
        loop {
            log::info!("Start");
            match rs
                .io_loop(
                    &mut rx,
                    &mut listener,
                    &mut listener2,
                    &mut listener3,
                    &mut socket,
                    &key,
                )
                .await
            {
                LoopFailure::UdpSocket => {
                    drop(socket);
                    socket = FramedSocket::new_with_buf_size(&addr, rmem).await?;
                }
                LoopFailure::Listener => {
                    drop(listener);
                    listener = new_listener(&addr, false).await?;
                }
                LoopFailure::Listener2 => {
                    drop(listener2);
                    listener2 = new_listener(&addr2, false).await?;
                }
                LoopFailure::Listener3 => {
                    drop(listener3);
                    listener3 = new_listener(&addr3, false).await?;
                }
            }
        }
    }

    async fn io_loop(
        &mut self,
        rx: &mut Receiver,
        listener: &mut TcpListener,
        listener2: &mut TcpListener,
        listener3: &mut TcpListener,
        socket: &mut FramedSocket,
        key: &str,
    ) -> LoopFailure {
        let mut timer_check_relay = interval(Duration::from_millis(CHECK_RELAY_TIMEOUT));
        loop {
            tokio::select! {
                _ = timer_check_relay.tick() => {
                    if self.relay_servers0.len() > 1 {
                        let rs = self.relay_servers0.clone();
                        let tx = self.tx.clone();
                        tokio::spawn(async move {
                            check_relay_servers(rs, tx).await;
                        });
                    }
                }
                Some(data) = rx.recv() => {
                    match data {
                        Data::Msg(msg, addr) => { allow_err!(socket.send(&msg, addr).await); }
                        Data::RelayServers0(rs) => { self.parse_relay_servers(&rs); }
                        Data::RelayServers(rs) => { self.relay_servers = Arc::new(rs); }
                    }
                }
                res = socket.next() => {
                    match res {
                        Some(Ok((bytes, addr))) => {
                            if let Err(err) = self.handle_udp(&bytes, addr.into(), socket, key).await {
                                log::error!("udp failure: {}", err);
                                return LoopFailure::UdpSocket;
                            }
                        }
                        Some(Err(err)) => {
                            log::error!("udp failure: {}", err);
                            return LoopFailure::UdpSocket;
                        }
                        None => {
                            // unreachable!() ?
                        }
                    }
                }
                res = listener2.accept() => {
                    match res {
                        Ok((stream, addr))  => {
                            stream.set_nodelay(true).ok();
                            self.handle_listener2(stream, addr).await;
                        }
                        Err(err) => {
                           log::error!("listener2.accept failed: {}", err);
                           return LoopFailure::Listener2;
                        }
                    }
                }
                res = listener3.accept() => {
                    match res {
                        Ok((stream, addr))  => {
                            stream.set_nodelay(true).ok();
                            self.handle_listener(stream, addr, key, true).await;
                        }
                        Err(err) => {
                           log::error!("listener3.accept failed: {}", err);
                           return LoopFailure::Listener3;
                        }
                    }
                }
                res = listener.accept() => {
                    match res {
                        Ok((stream, addr)) => {
                            stream.set_nodelay(true).ok();
                            self.handle_listener(stream, addr, key, false).await;
                        }
                       Err(err) => {
                           log::error!("listener.accept failed: {}", err);
                           return LoopFailure::Listener;
                       }
                    }
                }
            }
        }
    }

    #[inline]
    async fn handle_udp(
        &mut self,
        bytes: &BytesMut,
        addr: SocketAddr,
        socket: &mut FramedSocket,
        key: &str,
    ) -> ResultType<()> {
        if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(&bytes) {
            match msg_in.union {
                Some(rendezvous_message::Union::register_peer(rp)) => {
                    // B registered
                    if rp.id.len() > 0 {
                        log::trace!("New peer registered: {:?} {:?}", &rp.id, &addr);
                        self.update_addr(rp.id, addr, socket).await?;
                        if self.serial > rp.serial {
                            let mut msg_out = RendezvousMessage::new();
                            msg_out.set_configure_update(ConfigUpdate {
                                serial: self.serial,
                                rendezvous_servers: (*self.rendezvous_servers).clone(),
                                ..Default::default()
                            });
                            socket.send(&msg_out, addr).await?;
                        }
                    }
                }
                Some(rendezvous_message::Union::register_pk(rk)) => {
                    if rk.uuid.is_empty() || rk.pk.is_empty() {
                        return Ok(());
                    }
                    let id = rk.id;
                    let ip = addr.ip().to_string();
                    if id.len() < 6 {
                        return send_rk_res(socket, addr, UUID_MISMATCH).await;
                    } else if !self.check_ip_blocker(&ip, &id).await {
                        return send_rk_res(socket, addr, TOO_FREQUENT).await;
                    }
                    let peer = self.pm.get_or(&id).await;
                    let (changed, ip_changed) = {
                        let peer = peer.read().await;
                        if peer.uuid.is_empty() {
                            (true, false)
                        } else {
                            if peer.uuid == rk.uuid {
                                if peer.info.ip != ip && peer.pk != rk.pk {
                                    log::warn!(
                                        "Peer {} ip/pk mismatch: {}/{:?} vs {}/{:?}",
                                        id,
                                        ip,
                                        rk.pk,
                                        peer.info.ip,
                                        peer.pk,
                                    );
                                    drop(peer);
                                    return send_rk_res(socket, addr, UUID_MISMATCH).await;
                                }
                            } else {
                                log::warn!(
                                    "Peer {} uuid mismatch: {:?} vs {:?}",
                                    id,
                                    rk.uuid,
                                    peer.uuid
                                );
                                drop(peer);
                                return send_rk_res(socket, addr, UUID_MISMATCH).await;
                            }
                            let ip_changed = peer.info.ip != ip;
                            (
                                peer.uuid != rk.uuid || peer.pk != rk.pk || ip_changed,
                                ip_changed,
                            )
                        }
                    };
                    let mut req_pk = peer.read().await.reg_pk;
                    if req_pk.1.elapsed().as_secs() > 6 {
                        req_pk.0 = 0;
                    } else if req_pk.0 > 2 {
                        return send_rk_res(socket, addr, TOO_FREQUENT).await;
                    }
                    req_pk.0 += 1;
                    req_pk.1 = Instant::now();
                    peer.write().await.reg_pk = req_pk;
                    if ip_changed {
                        let mut lock = IP_CHANGES.lock().await;
                        if let Some((tm, ips)) = lock.get_mut(&id) {
                            if tm.elapsed().as_secs() > IP_CHANGE_DUR {
                                *tm = Instant::now();
                                ips.clear();
                                ips.insert(ip.clone(), 1);
                            } else {
                                if let Some(v) = ips.get_mut(&ip) {
                                    *v += 1;
                                } else {
                                    ips.insert(ip.clone(), 1);
                                }
                            }
                        } else {
                            lock.insert(
                                id.clone(),
                                (Instant::now(), HashMap::from([(ip.clone(), 1)])),
                            );
                        }
                    }
                    if changed {
                        self.pm.update_pk(id, peer, addr, rk.uuid, rk.pk, ip).await;
                    }
                    let mut msg_out = RendezvousMessage::new();
                    msg_out.set_register_pk_response(RegisterPkResponse {
                        result: register_pk_response::Result::OK.into(),
                        ..Default::default()
                    });
                    socket.send(&msg_out, addr).await?
                }
                Some(rendezvous_message::Union::punch_hole_request(ph)) => {
                    if self.pm.is_in_memory(&ph.id).await {
                        self.handle_udp_punch_hole_request(addr, ph, key).await?;
                    } else {
                        // not in memory, fetch from db with spawn in case blocking me
                        let mut me = self.clone();
                        let key = key.to_owned();
                        tokio::spawn(async move {
                            allow_err!(me.handle_udp_punch_hole_request(addr, ph, &key).await);
                        });
                    }
                }
                Some(rendezvous_message::Union::punch_hole_sent(phs)) => {
                    self.handle_hole_sent(phs, addr, Some(socket)).await?;
                }
                Some(rendezvous_message::Union::local_addr(la)) => {
                    self.handle_local_addr(la, addr, Some(socket)).await?;
                }
                Some(rendezvous_message::Union::configure_update(mut cu)) => {
                    if addr.ip() == ADDR_127 && cu.serial > self.serial {
                        self.serial = cu.serial;
                        self.rendezvous_servers = Arc::new(
                            cu.rendezvous_servers
                                .drain(..)
                                .filter(|x| {
                                    !x.is_empty()
                                        && test_if_valid_server(x, "rendezvous-server").is_ok()
                                })
                                .collect(),
                        );
                        log::info!(
                            "configure updated: serial={} rendezvous-servers={:?}",
                            self.serial,
                            self.rendezvous_servers
                        );
                    }
                }
                Some(rendezvous_message::Union::software_update(su)) => {
                    if !self.version.is_empty() && su.url != self.version {
                        let mut msg_out = RendezvousMessage::new();
                        msg_out.set_software_update(SoftwareUpdate {
                            url: self.software_url.clone(),
                            ..Default::default()
                        });
                        socket.send(&msg_out, addr).await?;
                    }
                }
                _ => {}
            }
        }
        Ok(())
    }

    #[inline]
    async fn handle_tcp(
        &mut self,
        bytes: &[u8],
        sink: &mut Option<Sink>,
        addr: SocketAddr,
        key: &str,
        ws: bool,
    ) -> bool {
        if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(&bytes) {
            match msg_in.union {
                Some(rendezvous_message::Union::punch_hole_request(ph)) => {
                    // there maybe several attempt, so sink can be none
                    if let Some(sink) = sink.take() {
                        self.tcp_punch.lock().await.insert(addr, sink);
                    }
                    allow_err!(self.handle_tcp_punch_hole_request(addr, ph, &key, ws).await);
                    return true;
                }
                Some(rendezvous_message::Union::request_relay(mut rf)) => {
                    // there maybe several attempt, so sink can be none
                    if let Some(sink) = sink.take() {
                        self.tcp_punch.lock().await.insert(addr, sink);
                    }
                    if let Some(peer) = self.pm.get_in_memory(&rf.id).await {
                        let mut msg_out = RendezvousMessage::new();
                        rf.socket_addr = AddrMangle::encode(addr);
                        msg_out.set_request_relay(rf);
                        let peer_addr = peer.read().await.socket_addr;
                        self.tx.send(Data::Msg(msg_out, peer_addr)).ok();
                    }
                    return true;
                }
                Some(rendezvous_message::Union::relay_response(mut rr)) => {
                    let addr_b = AddrMangle::decode(&rr.socket_addr);
                    rr.socket_addr = Default::default();
                    let id = rr.get_id();
                    if !id.is_empty() {
                        let pk = self.get_pk(&rr.version, id.to_owned()).await;
                        rr.set_pk(pk);
                    }
                    let mut msg_out = RendezvousMessage::new();
                    msg_out.set_relay_response(rr);
                    allow_err!(self.send_to_tcp_sync(msg_out, addr_b).await);
                }
                Some(rendezvous_message::Union::punch_hole_sent(phs)) => {
                    allow_err!(self.handle_hole_sent(phs, addr, None).await);
                }
                Some(rendezvous_message::Union::local_addr(la)) => {
                    allow_err!(self.handle_local_addr(la, addr, None).await);
                }
                Some(rendezvous_message::Union::test_nat_request(tar)) => {
                    let mut msg_out = RendezvousMessage::new();
                    let mut res = TestNatResponse {
                        port: addr.port() as _,
                        ..Default::default()
                    };
                    if self.serial > tar.serial {
                        let mut cu = ConfigUpdate::new();
                        cu.serial = self.serial;
                        cu.rendezvous_servers = (*self.rendezvous_servers).clone();
                        res.cu = MessageField::from_option(Some(cu));
                    }
                    msg_out.set_test_nat_response(res);
                    Self::send_to_sink(sink, msg_out).await;
                }
                Some(rendezvous_message::Union::register_pk(_rk)) => {
                    let res = register_pk_response::Result::NOT_SUPPORT;
                    let mut msg_out = RendezvousMessage::new();
                    msg_out.set_register_pk_response(RegisterPkResponse {
                        result: res.into(),
                        ..Default::default()
                    });
                    Self::send_to_sink(sink, msg_out).await;
                }
                _ => {}
            }
        }
        false
    }

    #[inline]
    async fn update_addr(
        &mut self,
        id: String,
        socket_addr: SocketAddr,
        socket: &mut FramedSocket,
    ) -> ResultType<()> {
        let (request_pk, ip_change) = if let Some(old) = self.pm.get_in_memory(&id).await {
            let mut old = old.write().await;
            let ip = socket_addr.ip();
            let ip_change = if old.socket_addr.port() != 0 {
                ip != old.socket_addr.ip()
            } else {
                ip.to_string() != old.info.ip
            } && ip != ADDR_127;
            let request_pk = old.pk.is_empty() || ip_change;
            if !request_pk {
                old.socket_addr = socket_addr;
                old.last_reg_time = Instant::now();
            }
            let ip_change = if ip_change && old.reg_pk.0 <= 2 {
                Some(if old.socket_addr.port() == 0 {
                    old.info.ip.clone()
                } else {
                    old.socket_addr.to_string()
                })
            } else {
                None
            };
            (request_pk, ip_change)
        } else {
            (true, None)
        };
        if let Some(old) = ip_change {
            log::info!("IP change of {} from {} to {}", id, old, socket_addr);
        }
        let mut msg_out = RendezvousMessage::new();
        msg_out.set_register_peer_response(RegisterPeerResponse {
            request_pk,
            ..Default::default()
        });
        socket.send(&msg_out, socket_addr).await
    }

    #[inline]
    async fn handle_hole_sent<'a>(
        &mut self,
        phs: PunchHoleSent,
        addr: SocketAddr,
        socket: Option<&'a mut FramedSocket>,
    ) -> ResultType<()> {
        // punch hole sent from B, tell A that B is ready to be connected
        let addr_a = AddrMangle::decode(&phs.socket_addr);
        log::debug!(
            "{} punch hole response to {:?} from {:?}",
            if socket.is_none() { "TCP" } else { "UDP" },
            &addr_a,
            &addr
        );
        let mut msg_out = RendezvousMessage::new();
        let mut p = PunchHoleResponse {
            socket_addr: AddrMangle::encode(addr),
            pk: self.get_pk(&phs.version, phs.id).await,
            relay_server: phs.relay_server.clone(),
            ..Default::default()
        };
        if let Ok(t) = phs.nat_type.enum_value() {
            p.set_nat_type(t);
        }
        msg_out.set_punch_hole_response(p);
        if let Some(socket) = socket {
            socket.send(&msg_out, addr_a).await?;
        } else {
            self.send_to_tcp(msg_out, addr_a).await;
        }
        Ok(())
    }

    #[inline]
    async fn handle_local_addr<'a>(
        &mut self,
        la: LocalAddr,
        addr: SocketAddr,
        socket: Option<&'a mut FramedSocket>,
    ) -> ResultType<()> {
        // relay local addrs of B to A
        let addr_a = AddrMangle::decode(&la.socket_addr);
        log::debug!(
            "{} local addrs response to {:?} from {:?}",
            if socket.is_none() { "TCP" } else { "UDP" },
            &addr_a,
            &addr
        );
        let mut msg_out = RendezvousMessage::new();
        let mut p = PunchHoleResponse {
            socket_addr: la.local_addr.clone(),
            pk: self.get_pk(&la.version, la.id).await,
            relay_server: la.relay_server,
            ..Default::default()
        };
        p.set_is_local(true);
        msg_out.set_punch_hole_response(p);
        if let Some(socket) = socket {
            socket.send(&msg_out, addr_a).await?;
        } else {
            self.send_to_tcp(msg_out, addr_a).await;
        }
        Ok(())
    }

    #[inline]
    async fn handle_punch_hole_request(
        &mut self,
        addr: SocketAddr,
        ph: PunchHoleRequest,
        key: &str,
        ws: bool,
    ) -> ResultType<(RendezvousMessage, Option<SocketAddr>)> {
        if !key.is_empty() && ph.licence_key != key {
            let mut msg_out = RendezvousMessage::new();
            msg_out.set_punch_hole_response(PunchHoleResponse {
                failure: punch_hole_response::Failure::LICENSE_MISMATCH.into(),
                ..Default::default()
            });
            return Ok((msg_out, None));
        }
        let id = ph.id;
        // punch hole request from A, relay to B,
        // check if in same intranet first,
        // fetch local addrs if in same intranet.
        // because punch hole won't work if in the same intranet,
        // all routers will drop such self-connections.
        if let Some(peer) = self.pm.get(&id).await {
            let (elapsed, peer_addr) = {
                let r = peer.read().await;
                (r.last_reg_time.elapsed().as_millis() as i32, r.socket_addr)
            };
            if elapsed >= REG_TIMEOUT {
                let mut msg_out = RendezvousMessage::new();
                msg_out.set_punch_hole_response(PunchHoleResponse {
                    failure: punch_hole_response::Failure::OFFLINE.into(),
                    ..Default::default()
                });
                return Ok((msg_out, None));
            }
            let mut msg_out = RendezvousMessage::new();
            if unsafe { ALWAYS_USE_RELAY } {
                let relay_server = self.get_relay_server(addr.ip(), peer_addr.ip());
                if !relay_server.is_empty() {
                    msg_out.set_request_relay(RequestRelay {
                        relay_server,
                        ..Default::default()
                    });
                    return Ok((msg_out, Some(peer_addr)));
                }
            }
            let same_intranet = !ws
                && match peer_addr {
                    SocketAddr::V4(a) => match addr {
                        SocketAddr::V4(b) => a.ip() == b.ip(),
                        _ => false,
                    },
                    SocketAddr::V6(a) => match addr {
                        SocketAddr::V6(b) => a.ip() == b.ip(),
                        _ => false,
                    },
                };
            let socket_addr = AddrMangle::encode(addr);
            let relay_server = self.get_relay_server(addr.ip(), peer_addr.ip());
            if same_intranet {
                log::debug!(
                    "Fetch local addr {:?} {:?} request from {:?}",
                    id,
                    peer_addr,
                    addr
                );
                msg_out.set_fetch_local_addr(FetchLocalAddr {
                    socket_addr,
                    relay_server,
                    ..Default::default()
                });
            } else {
                log::debug!(
                    "Punch hole {:?} {:?} request from {:?}",
                    id,
                    peer_addr,
                    addr
                );
                msg_out.set_punch_hole(PunchHole {
                    socket_addr,
                    nat_type: ph.nat_type,
                    relay_server,
                    ..Default::default()
                });
            }
            return Ok((msg_out, Some(peer_addr)));
        } else {
            let mut msg_out = RendezvousMessage::new();
            msg_out.set_punch_hole_response(PunchHoleResponse {
                failure: punch_hole_response::Failure::ID_NOT_EXIST.into(),
                ..Default::default()
            });
            return Ok((msg_out, None));
        }
    }

    #[inline]
    async fn send_to_tcp(&mut self, msg: RendezvousMessage, addr: SocketAddr) {
        let mut tcp = self.tcp_punch.lock().await.remove(&addr);
        tokio::spawn(async move {
            Self::send_to_sink(&mut tcp, msg).await;
        });
    }

    #[inline]
    async fn send_to_sink(sink: &mut Option<Sink>, msg: RendezvousMessage) {
        if let Some(sink) = sink.as_mut() {
            if let Ok(bytes) = msg.write_to_bytes() {
                match sink {
                    Sink::TcpStream(s) => {
                        allow_err!(s.send(Bytes::from(bytes)).await);
                    }
                    Sink::Ws(ws) => {
                        allow_err!(ws.send(tungstenite::Message::Binary(bytes)).await);
                    }
                }
            }
        }
    }

    #[inline]
    async fn send_to_tcp_sync(
        &mut self,
        msg: RendezvousMessage,
        addr: SocketAddr,
    ) -> ResultType<()> {
        let mut sink = self.tcp_punch.lock().await.remove(&addr);
        Self::send_to_sink(&mut sink, msg).await;
        Ok(())
    }

    #[inline]
    async fn handle_tcp_punch_hole_request(
        &mut self,
        addr: SocketAddr,
        ph: PunchHoleRequest,
        key: &str,
        ws: bool,
    ) -> ResultType<()> {
        let (msg, to_addr) = self.handle_punch_hole_request(addr, ph, key, ws).await?;
        if let Some(addr) = to_addr {
            self.tx.send(Data::Msg(msg, addr))?;
        } else {
            self.send_to_tcp_sync(msg, addr).await?;
        }
        Ok(())
    }

    #[inline]
    async fn handle_udp_punch_hole_request(
        &mut self,
        addr: SocketAddr,
        ph: PunchHoleRequest,
        key: &str,
    ) -> ResultType<()> {
        let (msg, to_addr) = self.handle_punch_hole_request(addr, ph, key, false).await?;
        self.tx.send(Data::Msg(
            msg,
            match to_addr {
                Some(addr) => addr,
                None => addr,
            },
        ))?;
        Ok(())
    }

    async fn check_ip_blocker(&self, ip: &str, id: &str) -> bool {
        let mut lock = IP_BLOCKER.lock().await;
        let now = Instant::now();
        if let Some(old) = lock.get_mut(ip) {
            let counter = &mut old.0;
            if counter.1.elapsed().as_secs() > IP_BLOCK_DUR {
                counter.0 = 0;
            } else if counter.0 > 30 {
                return false;
            }
            counter.0 += 1;
            counter.1 = now;

            let counter = &mut old.1;
            let is_new = counter.0.get(id).is_none();
            if counter.1.elapsed().as_secs() > DAY_SECONDS {
                counter.0.clear();
            } else if counter.0.len() > 300 {
                return !is_new;
            }
            if is_new {
                counter.0.insert(id.to_owned());
            }
            counter.1 = now;
        } else {
            lock.insert(ip.to_owned(), ((0, now), (Default::default(), now)));
        }
        true
    }

    fn parse_relay_servers(&mut self, relay_servers: &str) {
        let rs = get_servers(relay_servers, "relay-servers");
        self.relay_servers0 = Arc::new(rs);
        self.relay_servers = self.relay_servers0.clone();
    }

    fn get_relay_server(&self, pa: IpAddr, pb: IpAddr) -> String {
        if self.relay_servers.is_empty() {
            return "".to_owned();
        } else if self.relay_servers.len() == 1 {
            return self.relay_servers[0].clone();
        }
        let i = unsafe {
            ROTATION_RELAY_SERVER += 1;
            ROTATION_RELAY_SERVER % self.relay_servers.len()
        };
        self.relay_servers[i].clone()
    }

    async fn check_cmd(&self, cmd: &str) -> String {
        let mut res = "".to_owned();
        let mut fds = cmd.trim().split(" ");
        match fds.next() {
            Some("h") => {
                res = format!(
                    "{}\n{}\n{}\n{}\n{}\n{}\n",
                    "relay-servers(rs) <separated by ,>",
                    "reload-geo(rg)",
                    "ip-blocker(ib) [<ip>|<number>] [-]",
                    "ip-changes(ic) [<id>|<number>] [-]",
                    "always-use-relay(aur)",
                    "test-geo(tg) <ip1> <ip2>"
                )
            }
            Some("relay-servers" | "rs") => {
                if let Some(rs) = fds.next() {
                    self.tx.send(Data::RelayServers0(rs.to_owned())).ok();
                } else {
                    for ip in self.relay_servers.iter() {
                        res += &format!("{}\n", ip);
                    }
                }
            }
            Some("ip-blocker" | "ib") => {
                let mut lock = IP_BLOCKER.lock().await;
                lock.retain(|&_, (a, b)| {
                    a.1.elapsed().as_secs() <= IP_BLOCK_DUR
                        || b.1.elapsed().as_secs() <= DAY_SECONDS
                });
                res = format!("{}\n", lock.len());
                let ip = fds.next();
                let mut start = ip.map(|x| x.parse::<i32>().unwrap_or(-1)).unwrap_or(-1);
                if start < 0 {
                    if let Some(ip) = ip {
                        if let Some((a, b)) = lock.get(ip) {
                            res += &format!(
                                "{}/{}s {}/{}s\n",
                                a.0,
                                a.1.elapsed().as_secs(),
                                b.0.len(),
                                b.1.elapsed().as_secs()
                            );
                        }
                        if fds.next() == Some("-") {
                            lock.remove(ip);
                        }
                    } else {
                        start = 0;
                    }
                }
                if start >= 0 {
                    let mut it = lock.iter();
                    for i in 0..(start + 10) {
                        let x = it.next();
                        if x.is_none() {
                            break;
                        }
                        if i < start {
                            continue;
                        }
                        if let Some((ip, (a, b))) = x {
                            res += &format!(
                                "{}: {}/{}s {}/{}s\n",
                                ip,
                                a.0,
                                a.1.elapsed().as_secs(),
                                b.0.len(),
                                b.1.elapsed().as_secs()
                            );
                        }
                    }
                }
            }
            Some("ip-changes" | "ic") => {
                let mut lock = IP_CHANGES.lock().await;
                lock.retain(|&_, v| v.0.elapsed().as_secs() < IP_CHANGE_DUR_X2 && v.1.len() > 1);
                res = format!("{}\n", lock.len());
                let id = fds.next();
                let mut start = id.map(|x| x.parse::<i32>().unwrap_or(-1)).unwrap_or(-1);
                if start < 0 || start > 10_000_000 {
                    if let Some(id) = id {
                        if let Some((tm, ips)) = lock.get(id) {
                            res += &format!("{}s {:?}\n", tm.elapsed().as_secs(), ips);
                        }
                        if fds.next() == Some("-") {
                            lock.remove(id);
                        }
                    } else {
                        start = 0;
                    }
                }
                if start >= 0 {
                    let mut it = lock.iter();
                    for i in 0..(start + 10) {
                        let x = it.next();
                        if x.is_none() {
                            break;
                        }
                        if i < start {
                            continue;
                        }
                        if let Some((id, (tm, ips))) = x {
                            res += &format!("{}: {}s {:?}\n", id, tm.elapsed().as_secs(), ips,);
                        }
                    }
                }
            }
            Some("always-use-relay" | "aur") => {
                if let Some(rs) = fds.next() {
                    if rs.to_uppercase() == "Y" {
                        unsafe { ALWAYS_USE_RELAY = true };
                    } else {
                        unsafe { ALWAYS_USE_RELAY = false };
                    }
                    self.tx.send(Data::RelayServers0(rs.to_owned())).ok();
                } else {
                    res += &format!("ALWAYS_USE_RELAY: {:?}\n", unsafe { ALWAYS_USE_RELAY });
                }
            }
            Some("test-geo" | "tg") => {
                if let Some(rs) = fds.next() {
                    if let Ok(a) = rs.parse::<IpAddr>() {
                        if let Some(rs) = fds.next() {
                            if let Ok(b) = rs.parse::<IpAddr>() {
                                res = format!("{:?}", self.get_relay_server(a, b));
                            }
                        } else {
                            res = format!("{:?}", self.get_relay_server(a, a));
                        }
                    }
                }
            }
            _ => {}
        }
        res
    }

    async fn handle_listener2(&self, stream: TcpStream, addr: SocketAddr) {
        if addr.ip().to_string() == "127.0.0.1" {
            let rs = self.clone();
            tokio::spawn(async move {
                let mut stream = stream;
                let mut buffer = [0; 64];
                if let Ok(Ok(n)) = timeout(1000, stream.read(&mut buffer[..])).await {
                    if let Ok(data) = std::str::from_utf8(&buffer[..n]) {
                        let res = rs.check_cmd(data).await;
                        stream.write(res.as_bytes()).await.ok();
                    }
                }
            });
            return;
        }
        let stream = FramedStream::from(stream, addr);
        tokio::spawn(async move {
            let mut stream = stream;
            if let Some(Ok(bytes)) = stream.next_timeout(30_000).await {
                if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(&bytes) {
                    if let Some(rendezvous_message::Union::test_nat_request(_)) = msg_in.union {
                        let mut msg_out = RendezvousMessage::new();
                        msg_out.set_test_nat_response(TestNatResponse {
                            port: addr.port() as _,
                            ..Default::default()
                        });
                        stream.send(&msg_out).await.ok();
                    }
                }
            }
        });
    }

    async fn handle_listener(
        &self,
        stream: TcpStream,
        addr: SocketAddr,
        key: &str,
        ws: bool,
    ) {
        log::debug!("Tcp connection from {:?}, ws: {}", addr, ws);
        let mut rs = self.clone();
        let key = key.to_owned();
        tokio::spawn(async move {
            allow_err!(
                rs.handle_listener_inner(stream, addr, &key, ws)
                    .await
            );
        });
    }

    #[inline]
    async fn handle_listener_inner(
        &mut self,
        stream: TcpStream,
        addr: SocketAddr,
        key: &str,
        ws: bool,
    ) -> ResultType<()> {
        let mut sink;
        if ws {
            let ws_stream = tokio_tungstenite::accept_async(stream).await?;
            let (a, mut b) = ws_stream.split();
            sink = Some(Sink::Ws(a));
            while let Ok(Some(Ok(msg))) = timeout(30_000, b.next()).await {
                match msg {
                    tungstenite::Message::Binary(bytes) => {
                        if !self
                            .handle_tcp(&bytes, &mut sink, addr, key, ws)
                            .await
                        {
                            break;
                        }
                    }
                    _ => {}
                }
            }
        } else {
            let (a, mut b) = Framed::new(stream, BytesCodec::new()).split();
            sink = Some(Sink::TcpStream(a));
            while let Ok(Some(Ok(bytes))) = timeout(30_000, b.next()).await {
                if !self
                    .handle_tcp(&bytes, &mut sink, addr, key, ws)
                    .await
                {
                    break;
                }
            }
        }
        if sink.is_none() {
            self.tcp_punch.lock().await.remove(&addr);
        }
        log::debug!("Tcp connection from {:?} closed", addr);
        Ok(())
    }

    #[inline]
    async fn get_pk(&mut self, version: &str, id: String) -> Vec<u8> {
        if version.is_empty() || self.sk.is_none() {
            Vec::new()
        } else {
            match self.pm.get(&id).await {
                Some(peer) => {
                    let pk = peer.read().await.pk.clone();
                    sign::sign(
                        &hbb_common::message_proto::IdPk {
                            id,
                            pk,
                            ..Default::default()
                        }
                        .write_to_bytes()
                        .unwrap_or_default(),
                        &self.sk.as_ref().unwrap(),
                    )
                }
                _ => Vec::new(),
            }
        }
    }

    #[inline]
    fn get_server_sk(&mut self, key: &str) -> String {
        let mut key = key.to_owned();
        if let Ok(sk) = base64::decode(&key) {
            if sk.len() == sign::SECRETKEYBYTES {
                log::info!("The key is a crypto private key");
                key = base64::encode(&sk[(sign::SECRETKEYBYTES / 2)..]);
                let mut tmp = [0u8; sign::SECRETKEYBYTES];
                tmp[..].copy_from_slice(&sk);
                self.sk = Some(sign::SecretKey(tmp));
            }
        }

        if key.is_empty() || key == "-" || key == "_" {
            let (pk, sk) = crate::common::gen_sk();
            self.sk = sk;
            if !key.is_empty() {
                key = pk;
            } else {
                std::env::set_var("KEY_FOR_API", pk);
            }
        }

        if !key.is_empty() {
            log::info!("Key: {}", key);
            std::env::set_var("KEY_FOR_API", key.clone());
        }
        key
    }
}

async fn check_relay_servers(rs0: Arc<RelayServers>, tx: Sender) {
    let mut futs = Vec::new();
    let rs = Arc::new(Mutex::new(Vec::new()));
    for x in rs0.iter() {
        let mut host = x.to_owned();
        if !host.contains(":") {
            host = format!("{}:{}", host, hbb_common::config::RELAY_PORT);
        }
        let rs = rs.clone();
        let x = x.clone();
        futs.push(tokio::spawn(async move {
            if FramedStream::new(&host, "0.0.0.0:0", CHECK_RELAY_TIMEOUT)
                .await
                .is_ok()
            {
                rs.lock().await.push(x);
            }
        }));
    }
    join_all(futs).await;
    log::debug!("check_relay_servers");
    let rs = std::mem::replace(&mut *rs.lock().await, Default::default());
    if !rs.is_empty() {
        tx.send(Data::RelayServers(rs)).ok();
    }
}

// temp solution to solve udp socket failure
async fn test_hbbs(addr: SocketAddr) -> ResultType<()> {
    let mut socket = FramedSocket::new("0.0.0.0:0").await?;
    let mut msg_out = RendezvousMessage::new();
    msg_out.set_register_peer(RegisterPeer {
        id: "(:test_hbbs:)".to_owned(),
        ..Default::default()
    });
    let mut last_time_recv = Instant::now();

    let mut timer = interval(Duration::from_secs(1));
    loop {
        tokio::select! {
          _ = timer.tick() => {
              if last_time_recv.elapsed().as_secs() > 12 {
                 log::error!("Timeout of test_hbbs");
                 std::process::exit(1);
              }
              socket.send(&msg_out, addr).await?;
          }
          Some(Ok((bytes, _))) = socket.next() => {
              if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(&bytes) {
                 log::trace!("Recv {:?} of test_hbbs", msg_in);
                 last_time_recv = Instant::now();
              }
          }
        }
    }
}

#[inline]
fn distance(a: &(i32, i32), b: &(i32, i32)) -> i32 {
    let dx = a.0 - b.0;
    let dy = a.1 - b.1;
    dx * dx + dy * dy
}

#[inline]
async fn send_rk_res(
    socket: &mut FramedSocket,
    addr: SocketAddr,
    res: register_pk_response::Result,
) -> ResultType<()> {
    let mut msg_out = RendezvousMessage::new();
    msg_out.set_register_pk_response(RegisterPkResponse {
        result: res.into(),
        ..Default::default()
    });
    socket.send(&msg_out, addr).await
}