Add shadow-tls support

proxy/shadowtls/outbound.go

@@ -0,0 +1,83 @@
+package shadowtls
+
+import (
+	"context"
+	"crypto/tls"
+
+	"github.com/sagernet/sing-shadowtls"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/singbridge"
+	"github.com/xtls/xray-core/transport"
+	"github.com/xtls/xray-core/transport/internet"
+)
+
+func init() {
+	common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return NewClient(ctx, config.(*ClientConfig))
+	}))
+}
+
+type Outbound struct {
+	ctx          context.Context
+	clientConfig shadowtls.ClientConfig
+}
+
+func NewClient(ctx context.Context, config *ClientConfig) (*Outbound, error) {
+	return &Outbound{
+		ctx: ctx,
+		clientConfig: shadowtls.ClientConfig{
+			Version:  int(config.Version),
+			Password: config.Password,
+			Server: singbridge.ToSocksaddr(net.Destination{
+				Address: config.Address.AsAddress(),
+				Port:    net.Port(config.Port),
+			}),
+			Logger: singbridge.NewLogger(newError),
+		},
+	}, nil
+}
+
+func (o *Outbound) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
+	var inboundConn net.Conn
+	inbound := session.InboundFromContext(ctx)
+	if inbound != nil {
+		inboundConn = inbound.Conn
+	}
+
+	outbound := session.OutboundFromContext(ctx)
+	if outbound == nil || !outbound.Target.IsValid() {
+		return newError("target not specified")
+	}
+	destination := outbound.Target
+
+	if destination.Network != net.Network_TCP {
+		return newError("only TCP is supported")
+	}
+
+	newError("tunneling request to ", destination, " via ", o.clientConfig.Server).WriteToLog(session.ExportIDToError(ctx))
+
+	var client *shadowtls.Client
+	clientConfig := o.clientConfig
+	if clientConfig.Version == 3 {
+		clientConfig.Dialer = singbridge.NewTLSDialer(dialer, func(conn net.Conn, config *tls.Config) net.Conn {
+			client.SetTLSConfig(config)
+			return conn
+		})
+	} else {
+		clientConfig.Dialer = singbridge.NewDialer(dialer)
+	}
+	var err error
+	client, err = shadowtls.NewClient(clientConfig)
+	if err != nil {
+		return newError("failed to create client").Base(err)
+	}
+
+	conn, err := client.DialContext(ctx)
+	if err != nil {
+		return newError("failed to connect to server").Base(err)
+	}
+
+	return singbridge.CopyConn(ctx, inboundConn, link, conn)
+}