Add Snell protocol. Refactor MASQUE HTTP/2, Fair Queue. Update XHTTP, OpenVPN, Sudoku, Fallback. Fixes

protocol/snell/inbound.go

@@ -0,0 +1,130 @@
+package snell
+
+import (
+	"context"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/adapter/inbound"
+	"github.com/sagernet/sing-box/common/listener"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing-box/transport/snell"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/bufio"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+func RegisterInbound(registry *inbound.Registry) {
+	inbound.Register[option.SnellInboundOptions](registry, C.TypeSnell, NewInbound)
+}
+
+type Inbound struct {
+	inbound.Adapter
+	router   adapter.ConnectionRouterEx
+	logger   logger.ContextLogger
+	listener *listener.Listener
+	service  *snell.Service
+}
+
+func NewInbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.SnellInboundOptions) (adapter.Inbound, error) {
+	if options.PSK == "" {
+		return nil, E.New("snell requires psk")
+	}
+	udpEnabled := common.Contains(options.Network.Build(), N.NetworkUDP)
+	obfsMode := ""
+	if options.Obfs != nil {
+		obfsMode = options.Obfs.Mode
+	}
+	in := &Inbound{
+		Adapter: inbound.NewAdapter(C.TypeSnell, tag),
+		router:  router,
+		logger:  logger,
+	}
+	service, err := snell.NewService(snell.ServiceOptions{
+		PSK:      []byte(options.PSK),
+		Version:  options.Version,
+		ObfsMode: obfsMode,
+		UDP:      udpEnabled,
+		Logger:   logger,
+		Handler:  (*inboundHandler)(in),
+	})
+	if err != nil {
+		return nil, err
+	}
+	in.service = service
+	in.listener = listener.New(listener.Options{
+		Context:           ctx,
+		Logger:            logger,
+		Network:           []string{N.NetworkTCP},
+		Listen:            options.ListenOptions,
+		ConnectionHandler: in,
+	})
+	return in, nil
+}
+
+func (h *Inbound) Start(stage adapter.StartStage) error {
+	if stage != adapter.StartStateStart {
+		return nil
+	}
+	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.service.NewConnection(ctx, conn, metadata.Source)
+	N.CloseOnHandshakeFailure(conn, onClose, err)
+	if err != nil {
+		h.logger.ErrorContext(ctx, E.Cause(err, "process connection from ", metadata.Source))
+	}
+}
+
+var _ adapter.TCPInjectableInbound = (*Inbound)(nil)
+
+type inboundHandler Inbound
+
+func (h *inboundHandler) NewConnection(ctx context.Context, conn net.Conn, source M.Socksaddr, destination M.Socksaddr, clientID string) {
+	var metadata adapter.InboundContext
+	metadata.Inbound = h.Tag()
+	metadata.InboundType = h.Type()
+	metadata.InboundDetour = h.listener.ListenOptions().Detour
+	metadata.Source = source
+	metadata.Destination = destination
+	if clientID != "" {
+		metadata.User = clientID
+		h.logger.InfoContext(ctx, "[", clientID, "] inbound connection to ", destination)
+	} else {
+		h.logger.InfoContext(ctx, "inbound connection to ", destination)
+	}
+	done := make(chan struct{})
+	h.router.RouteConnectionEx(ctx, conn, metadata, N.OnceClose(func(error) {
+		close(done)
+	}))
+	<-done
+}
+
+func (h *inboundHandler) NewPacketConnection(ctx context.Context, conn net.PacketConn, source M.Socksaddr, clientID string) {
+	var metadata adapter.InboundContext
+	metadata.Inbound = h.Tag()
+	metadata.InboundType = h.Type()
+	metadata.InboundDetour = h.listener.ListenOptions().Detour
+	metadata.Source = source
+	if clientID != "" {
+		metadata.User = clientID
+		h.logger.InfoContext(ctx, "[", clientID, "] inbound packet connection")
+	} else {
+		h.logger.InfoContext(ctx, "inbound packet connection")
+	}
+	done := make(chan struct{})
+	h.router.RoutePacketConnectionEx(ctx, bufio.NewPacketConn(conn), metadata, N.OnceClose(func(error) {
+		close(done)
+	}))
+	<-done
+}