refactor: Modular inbounds/outbounds

protocol/mixed/inbound.go

@@ -0,0 +1,109 @@
+package mixed
+
+import (
+	std_bufio "bufio"
+	"context"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/adapter/inbound"
+	"github.com/sagernet/sing-box/common/listener"
+	"github.com/sagernet/sing-box/common/uot"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common/auth"
+	E "github.com/sagernet/sing/common/exceptions"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/protocol/http"
+	"github.com/sagernet/sing/protocol/socks"
+	"github.com/sagernet/sing/protocol/socks/socks4"
+	"github.com/sagernet/sing/protocol/socks/socks5"
+)
+
+func RegisterInbound(registry *inbound.Registry) {
+	inbound.Register[option.HTTPMixedInboundOptions](registry, C.TypeMixed, NewInbound)
+}
+
+var _ adapter.TCPInjectableInbound = (*Inbound)(nil)
+
+type Inbound struct {
+	inbound.Adapter
+	router        adapter.ConnectionRouterEx
+	logger        log.ContextLogger
+	listener      *listener.Listener
+	authenticator *auth.Authenticator
+}
+
+func NewInbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.HTTPMixedInboundOptions) (adapter.Inbound, error) {
+	inbound := &Inbound{
+		Adapter:       inbound.NewAdapter(C.TypeMixed, tag),
+		router:        uot.NewRouter(router, logger),
+		logger:        logger,
+		authenticator: auth.NewAuthenticator(options.Users),
+	}
+	inbound.listener = listener.New(listener.Options{
+		Context:           ctx,
+		Logger:            logger,
+		Network:           []string{N.NetworkTCP},
+		Listen:            options.ListenOptions,
+		ConnectionHandler: inbound,
+		SetSystemProxy:    options.SetSystemProxy,
+		SystemProxySOCKS:  true,
+	})
+	return inbound, nil
+}
+
+func (h *Inbound) Start() error {
+	return h.listener.Start()
+}
+
+func (h *Inbound) Close() error {
+	return h.listener.Close()
+}
+
+func (h *Inbound) NewConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
+	err := h.newConnection(ctx, conn, metadata, onClose)
+	N.CloseOnHandshakeFailure(conn, onClose, err)
+	if err != nil {
+		h.logger.ErrorContext(ctx, E.Cause(err, "process connection from ", metadata.Source))
+	}
+}
+
+func (h *Inbound) newConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) error {
+	reader := std_bufio.NewReader(conn)
+	headerBytes, err := reader.Peek(1)
+	if err != nil {
+		return E.Cause(err, "peek first byte")
+	}
+	switch headerBytes[0] {
+	case socks4.Version, socks5.Version:
+		return socks.HandleConnectionEx(ctx, conn, reader, h.authenticator, nil, adapter.NewUpstreamHandlerEx(metadata, h.newUserConnection, h.streamUserPacketConnection), metadata.Source, metadata.Destination, onClose)
+	default:
+		return http.HandleConnectionEx(ctx, conn, reader, h.authenticator, nil, adapter.NewUpstreamHandlerEx(metadata, h.newUserConnection, h.streamUserPacketConnection), metadata.Source, onClose)
+	}
+}
+
+func (h *Inbound) newUserConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
+	user, loaded := auth.UserFromContext[string](ctx)
+	if !loaded {
+		h.logger.InfoContext(ctx, "inbound connection to ", metadata.Destination)
+		h.router.RouteConnectionEx(ctx, conn, metadata, onClose)
+		return
+	}
+	metadata.User = user
+	h.logger.InfoContext(ctx, "[", user, "] inbound connection to ", metadata.Destination)
+	h.router.RouteConnectionEx(ctx, conn, metadata, onClose)
+}
+
+func (h *Inbound) streamUserPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
+	user, loaded := auth.UserFromContext[string](ctx)
+	if !loaded {
+		h.logger.InfoContext(ctx, "inbound packet connection to ", metadata.Destination)
+		h.router.RoutePacketConnectionEx(ctx, conn, metadata, onClose)
+		return
+	}
+	metadata.User = user
+	h.logger.InfoContext(ctx, "[", user, "] inbound packet connection to ", metadata.Destination)
+	h.router.RoutePacketConnectionEx(ctx, conn, metadata, onClose)
+}