package tcp import ( "context" "crypto/tls" "net" "time" "v2ray.com/core/app/log" "v2ray.com/core/common" v2net "v2ray.com/core/common/net" "v2ray.com/core/common/retry" "v2ray.com/core/transport/internet" v2tls "v2ray.com/core/transport/internet/tls" ) var ( ErrClosedListener = newError("Listener is closed.") ) type TCPListener struct { ctx context.Context listener *net.TCPListener tlsConfig *tls.Config authConfig internet.ConnectionAuthenticator config *Config conns chan<- internet.Connection } func ListenTCP(ctx context.Context, address v2net.Address, port v2net.Port, conns chan<- internet.Connection) (internet.Listener, error) { listener, err := net.ListenTCP("tcp", &net.TCPAddr{ IP: address.IP(), Port: int(port), }) if err != nil { return nil, err } log.Trace(newError("listening TCP on ", address, ":", port)) networkSettings := internet.TransportSettingsFromContext(ctx) tcpSettings := networkSettings.(*Config) l := &TCPListener{ ctx: ctx, listener: listener, config: tcpSettings, conns: conns, } if securitySettings := internet.SecuritySettingsFromContext(ctx); securitySettings != nil { tlsConfig, ok := securitySettings.(*v2tls.Config) if ok { l.tlsConfig = tlsConfig.GetTLSConfig() } } if tcpSettings.HeaderSettings != nil { headerConfig, err := tcpSettings.HeaderSettings.GetInstance() if err != nil { return nil, newError("invalid header settings").Base(err).AtError() } auth, err := internet.CreateConnectionAuthenticator(headerConfig) if err != nil { return nil, newError("invalid header settings.").Base(err).AtError() } l.authConfig = auth } go l.KeepAccepting() return l, nil } func (v *TCPListener) KeepAccepting() { for { select { case <-v.ctx.Done(): return default: } var conn net.Conn err := retry.ExponentialBackoff(5, 200).On(func() error { rawConn, err := v.listener.Accept() if err != nil { return err } conn = rawConn return nil }) if err != nil { log.Trace(newError("failed to accepted raw connections").Base(err).AtWarning()) continue } if v.tlsConfig != nil { conn = tls.Server(conn, v.tlsConfig) } if v.authConfig != nil { conn = v.authConfig.Server(conn) } select { case v.conns <- internet.Connection(conn): case <-time.After(time.Second * 5): conn.Close() } } } func (v *TCPListener) Addr() net.Addr { return v.listener.Addr() } func (v *TCPListener) Close() error { v.listener.Close() return nil } func init() { common.Must(internet.RegisterTransportListener(internet.TransportProtocol_TCP, ListenTCP)) }