package tcp import ( "context" gotls "crypto/tls" "strings" "time" "github.com/v2fly/v2ray-core/v4/common" "github.com/v2fly/v2ray-core/v4/common/net" "github.com/v2fly/v2ray-core/v4/common/serial" "github.com/v2fly/v2ray-core/v4/common/session" "github.com/v2fly/v2ray-core/v4/transport/internet" "github.com/v2fly/v2ray-core/v4/transport/internet/tls" ) // Listener is an internet.Listener that listens for TCP connections. type Listener struct { listener net.Listener tlsConfig *gotls.Config authConfig internet.ConnectionAuthenticator config *Config addConn internet.ConnHandler locker *internet.FileLocker // for unix domain socket } // ListenTCP creates a new Listener based on configurations. func ListenTCP(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, handler internet.ConnHandler) (internet.Listener, error) { l := &Listener{ addConn: handler, } tcpSettings := streamSettings.ProtocolSettings.(*Config) l.config = tcpSettings if l.config != nil { if streamSettings.SocketSettings == nil { streamSettings.SocketSettings = &internet.SocketConfig{} } streamSettings.SocketSettings.AcceptProxyProtocol = l.config.AcceptProxyProtocol } var listener net.Listener var err error if port == net.Port(0) { // unix listener, err = internet.ListenSystem(ctx, &net.UnixAddr{ Name: address.Domain(), Net: "unix", }, streamSettings.SocketSettings) if err != nil { return nil, newError("failed to listen Unix Domain Socket on ", address).Base(err) } newError("listening Unix Domain Socket on ", address).WriteToLog(session.ExportIDToError(ctx)) locker := ctx.Value(address.Domain()) if locker != nil { l.locker = locker.(*internet.FileLocker) } } else { listener, err = internet.ListenSystem(ctx, &net.TCPAddr{ IP: address.IP(), Port: int(port), }, streamSettings.SocketSettings) if err != nil { return nil, newError("failed to listen TCP on ", address, ":", port).Base(err) } newError("listening TCP on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx)) } if streamSettings.SocketSettings != nil && streamSettings.SocketSettings.AcceptProxyProtocol { newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx)) } l.listener = listener if config := tls.ConfigFromStreamSettings(streamSettings); config != nil { l.tlsConfig = config.GetTLSConfig() } if tcpSettings.HeaderSettings != nil { headerConfig, err := serial.GetInstanceOf(tcpSettings.HeaderSettings) 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 *Listener) keepAccepting() { for { conn, err := v.listener.Accept() if err != nil { errStr := err.Error() if strings.Contains(errStr, "closed") { break } newError("failed to accepted raw connections").Base(err).AtWarning().WriteToLog() if strings.Contains(errStr, "too many") { time.Sleep(time.Millisecond * 500) } continue } if v.tlsConfig != nil { conn = tls.Server(conn, v.tlsConfig) } if v.authConfig != nil { conn = v.authConfig.Server(conn) } v.addConn(internet.Connection(conn)) } } // Addr implements internet.Listener.Addr. func (v *Listener) Addr() net.Addr { return v.listener.Addr() } // Close implements internet.Listener.Close. func (v *Listener) Close() error { if v.locker != nil { v.locker.Release() } return v.listener.Close() } func init() { common.Must(internet.RegisterTransportListener(protocolName, ListenTCP)) }