2016-06-17 10:51:41 -04:00
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package kcp
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import (
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"context"
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"crypto/cipher"
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"crypto/tls"
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"io"
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"sync"
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"time"
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"v2ray.com/core/app/log"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/transport/internet"
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v2tls "v2ray.com/core/transport/internet/tls"
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"v2ray.com/core/transport/internet/udp"
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)
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type ConnectionID struct {
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Remote net.Address
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Port net.Port
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Conv uint16
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}
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type ServerConnection struct {
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local net.Addr
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remote net.Addr
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writer PacketWriter
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closer io.Closer
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}
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func (c *ServerConnection) Overhead() int {
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return c.writer.Overhead()
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}
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func (*ServerConnection) Read([]byte) (int, error) {
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panic("KCP|ServerConnection: Read should not be called.")
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}
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func (c *ServerConnection) Write(b []byte) (int, error) {
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return c.writer.Write(b)
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}
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func (c *ServerConnection) Close() error {
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return c.closer.Close()
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}
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func (*ServerConnection) Reset(input func([]Segment)) {
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}
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func (c *ServerConnection) LocalAddr() net.Addr {
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return c.local
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}
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func (c *ServerConnection) RemoteAddr() net.Addr {
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return c.remote
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}
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func (*ServerConnection) SetDeadline(time.Time) error {
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return nil
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}
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func (*ServerConnection) SetReadDeadline(time.Time) error {
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return nil
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}
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func (*ServerConnection) SetWriteDeadline(time.Time) error {
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return nil
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}
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// Listener defines a server listening for connections
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type Listener struct {
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sync.Mutex
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ctx context.Context
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sessions map[ConnectionID]*Connection
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hub *udp.Hub
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tlsConfig *tls.Config
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config *Config
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reader PacketReader
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header internet.PacketHeader
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security cipher.AEAD
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addConn internet.AddConnection
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}
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func NewListener(ctx context.Context, address net.Address, port net.Port, addConn internet.AddConnection) (*Listener, error) {
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networkSettings := internet.TransportSettingsFromContext(ctx)
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kcpSettings := networkSettings.(*Config)
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header, err := kcpSettings.GetPackerHeader()
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if err != nil {
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return nil, newError("failed to create packet header").Base(err).AtError()
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}
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security, err := kcpSettings.GetSecurity()
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if err != nil {
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return nil, newError("failed to create security").Base(err).AtError()
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}
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l := &Listener{
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header: header,
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security: security,
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reader: &KCPPacketReader{
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Header: header,
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Security: security,
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},
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sessions: make(map[ConnectionID]*Connection),
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ctx: ctx,
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config: kcpSettings,
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addConn: addConn,
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}
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securitySettings := internet.SecuritySettingsFromContext(ctx)
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if securitySettings != nil {
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switch securitySettings := securitySettings.(type) {
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case *v2tls.Config:
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l.tlsConfig = securitySettings.GetTLSConfig()
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}
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}
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hub, err := udp.ListenUDP(address, port, udp.ListenOption{Callback: l.OnReceive, Concurrency: 2})
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if err != nil {
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return nil, err
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}
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l.Lock()
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l.hub = hub
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l.Unlock()
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log.Trace(newError("listening on ", address, ":", port))
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return l, nil
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}
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func (v *Listener) OnReceive(payload *buf.Buffer, src net.Destination, originalDest net.Destination) {
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defer payload.Release()
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segments := v.reader.Read(payload.Bytes())
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if len(segments) == 0 {
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log.Trace(newError("discarding invalid payload from ", src))
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return
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}
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v.Lock()
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defer v.Unlock()
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select {
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case <-v.ctx.Done():
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return
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default:
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}
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if v.hub == nil {
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return
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}
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conv := segments[0].Conversation()
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cmd := segments[0].Command()
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id := ConnectionID{
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Remote: src.Address,
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Port: src.Port,
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Conv: conv,
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}
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conn, found := v.sessions[id]
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if !found {
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if cmd == CommandTerminate {
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return
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}
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writer := &Writer{
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id: id,
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hub: v.hub,
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dest: src,
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listener: v,
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}
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remoteAddr := &net.UDPAddr{
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IP: src.Address.IP(),
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Port: int(src.Port),
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}
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localAddr := v.hub.Addr()
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sConn := &ServerConnection{
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local: localAddr,
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remote: remoteAddr,
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writer: &KCPPacketWriter{
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Header: v.header,
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Writer: writer,
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Security: v.security,
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},
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closer: writer,
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}
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conn = NewConnection(conv, sConn, v.config)
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var netConn internet.Connection = conn
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if v.tlsConfig != nil {
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tlsConn := tls.Server(conn, v.tlsConfig)
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netConn = tlsConn
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}
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if !v.addConn(context.Background(), netConn) {
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return
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}
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v.sessions[id] = conn
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}
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conn.Input(segments)
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}
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func (v *Listener) Remove(id ConnectionID) {
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select {
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case <-v.ctx.Done():
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return
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default:
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v.Lock()
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delete(v.sessions, id)
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v.Unlock()
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}
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}
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// Close stops listening on the UDP address. Already Accepted connections are not closed.
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func (v *Listener) Close() error {
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v.hub.Close()
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v.Lock()
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defer v.Unlock()
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for _, conn := range v.sessions {
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go conn.Terminate()
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}
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return nil
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}
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func (v *Listener) ActiveConnections() int {
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v.Lock()
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defer v.Unlock()
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return len(v.sessions)
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}
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// Addr returns the listener's network address, The Addr returned is shared by all invocations of Addr, so do not modify it.
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func (v *Listener) Addr() net.Addr {
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return v.hub.Addr()
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}
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type Writer struct {
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id ConnectionID
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dest net.Destination
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hub *udp.Hub
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listener *Listener
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}
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func (v *Writer) Write(payload []byte) (int, error) {
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return v.hub.WriteTo(payload, v.dest)
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}
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func (v *Writer) Close() error {
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v.listener.Remove(v.id)
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return nil
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}
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func ListenKCP(ctx context.Context, address net.Address, port net.Port, addConn internet.AddConnection) (internet.Listener, error) {
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return NewListener(ctx, address, port, addConn)
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}
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func init() {
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common.Must(internet.RegisterTransportListener(internet.TransportProtocol_MKCP, ListenKCP))
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}
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