v1.0.0

transport/internet/tcp/hub.go

@@ -0,0 +1,143 @@
+// +build !confonly
+
+package tcp
+
+import (
+	"context"
+	gotls "crypto/tls"
+	"strings"
+	"time"
+
+	goxtls "github.com/xtls/go"
+
+	"github.com/xtls/xray-core/v1/common"
+	"github.com/xtls/xray-core/v1/common/net"
+	"github.com/xtls/xray-core/v1/common/session"
+	"github.com/xtls/xray-core/v1/transport/internet"
+	"github.com/xtls/xray-core/v1/transport/internet/tls"
+	"github.com/xtls/xray-core/v1/transport/internet/xtls"
+)
+
+// Listener is an internet.Listener that listens for TCP connections.
+type Listener struct {
+	listener   net.Listener
+	tlsConfig  *gotls.Config
+	xtlsConfig *goxtls.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 Doman 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(tls.WithNextProto("h2"))
+	}
+	if config := xtls.ConfigFromStreamSettings(streamSettings); config != nil {
+		l.xtlsConfig = config.GetXTLSConfig(xtls.WithNextProto("h2"))
+	}
+
+	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 *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)
+		} else if v.xtlsConfig != nil {
+			conn = xtls.Server(conn, v.xtlsConfig)
+		}
+		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))
+}