refactor: Modular inbounds/outbounds

protocol/redirect/redirect.go

@@ -0,0 +1,65 @@
+package redirect
+
+import (
+	"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/redir"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+func RegisterRedirect(registry *inbound.Registry) {
+	inbound.Register[option.RedirectInboundOptions](registry, C.TypeRedirect, NewRedirect)
+}
+
+type Redirect struct {
+	inbound.Adapter
+	router   adapter.Router
+	logger   log.ContextLogger
+	listener *listener.Listener
+}
+
+func NewRedirect(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.RedirectInboundOptions) (adapter.Inbound, error) {
+	redirect := &Redirect{
+		Adapter: inbound.NewAdapter(C.TypeRedirect, tag),
+		router:  router,
+		logger:  logger,
+	}
+	redirect.listener = listener.New(listener.Options{
+		Context:           ctx,
+		Logger:            logger,
+		Network:           []string{N.NetworkTCP},
+		Listen:            options.ListenOptions,
+		ConnectionHandler: redirect,
+	})
+	return redirect, nil
+}
+
+func (h *Redirect) Start() error {
+	return h.listener.Start()
+}
+
+func (h *Redirect) Close() error {
+	return h.listener.Close()
+}
+
+func (h *Redirect) NewConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
+	destination, err := redir.GetOriginalDestination(conn)
+	if err != nil {
+		conn.Close()
+		h.logger.ErrorContext(ctx, "process connection from ", conn.RemoteAddr(), ": get redirect destination: ", err)
+		return
+	}
+	metadata.Inbound = h.Tag()
+	metadata.InboundType = h.Type()
+	metadata.Destination = M.SocksaddrFromNetIP(destination)
+	h.logger.InfoContext(ctx, "inbound connection to ", metadata.Destination)
+	h.router.RouteConnectionEx(ctx, conn, metadata, onClose)
+}