refactor: Modular inbounds/outbounds

protocol/shadowtls/outbound.go

@@ -0,0 +1,104 @@
+package shadowtls
+
+import (
+	"context"
+	"net"
+	"os"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/adapter/outbound"
+	"github.com/sagernet/sing-box/common/dialer"
+	"github.com/sagernet/sing-box/common/tls"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing-shadowtls"
+	"github.com/sagernet/sing/common"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+func RegisterOutbound(registry *outbound.Registry) {
+	outbound.Register[option.ShadowTLSOutboundOptions](registry, C.TypeShadowTLS, NewOutbound)
+}
+
+type Outbound struct {
+	outbound.Adapter
+	client *shadowtls.Client
+}
+
+func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.ShadowTLSOutboundOptions) (adapter.Outbound, error) {
+	outbound := &Outbound{
+		Adapter: outbound.NewAdapterWithDialerOptions(C.TypeShadowTLS, []string{N.NetworkTCP}, tag, options.DialerOptions),
+	}
+	if options.TLS == nil || !options.TLS.Enabled {
+		return nil, C.ErrTLSRequired
+	}
+
+	if options.Version == 0 {
+		options.Version = 1
+	}
+
+	if options.Version == 1 {
+		options.TLS.MinVersion = "1.2"
+		options.TLS.MaxVersion = "1.2"
+	}
+	tlsConfig, err := tls.NewClient(ctx, options.Server, common.PtrValueOrDefault(options.TLS))
+	if err != nil {
+		return nil, err
+	}
+
+	var tlsHandshakeFunc shadowtls.TLSHandshakeFunc
+	switch options.Version {
+	case 1, 2:
+		tlsHandshakeFunc = func(ctx context.Context, conn net.Conn, _ shadowtls.TLSSessionIDGeneratorFunc) error {
+			return common.Error(tls.ClientHandshake(ctx, conn, tlsConfig))
+		}
+	case 3:
+		if idConfig, loaded := tlsConfig.(tls.WithSessionIDGenerator); loaded {
+			tlsHandshakeFunc = func(ctx context.Context, conn net.Conn, sessionIDGenerator shadowtls.TLSSessionIDGeneratorFunc) error {
+				idConfig.SetSessionIDGenerator(sessionIDGenerator)
+				return common.Error(tls.ClientHandshake(ctx, conn, tlsConfig))
+			}
+		} else {
+			stdTLSConfig, err := tlsConfig.Config()
+			if err != nil {
+				return nil, err
+			}
+			tlsHandshakeFunc = shadowtls.DefaultTLSHandshakeFunc(options.Password, stdTLSConfig)
+		}
+	}
+	outboundDialer, err := dialer.New(router, options.DialerOptions)
+	if err != nil {
+		return nil, err
+	}
+	client, err := shadowtls.NewClient(shadowtls.ClientConfig{
+		Version:      options.Version,
+		Password:     options.Password,
+		Server:       options.ServerOptions.Build(),
+		Dialer:       outboundDialer,
+		TLSHandshake: tlsHandshakeFunc,
+		Logger:       logger,
+	})
+	if err != nil {
+		return nil, err
+	}
+	outbound.client = client
+	return outbound, nil
+}
+
+func (h *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	ctx, metadata := adapter.ExtendContext(ctx)
+	metadata.Outbound = h.Tag()
+	metadata.Destination = destination
+	switch N.NetworkName(network) {
+	case N.NetworkTCP:
+		return h.client.DialContext(ctx)
+	default:
+		return nil, os.ErrInvalid
+	}
+}
+
+func (h *Outbound) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	return nil, os.ErrInvalid
+}