add unix domain socket

handler/relay/connect.go

@@ -59,6 +59,8 @@ func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network
 	var cc io.ReadWriteCloser
 
 	switch network {
+	case "unix":
+		cc, err = (&net.Dialer{}).DialContext(ctx, "unix", address)
 	case "serial":
 		cc, err = goserial.OpenPort(serial_util.ParseConfigFromAddr(address))
 	default:

handler/serial/handler.go

@@ -19,7 +19,6 @@ import (
 
 func init() {
 	registry.HandlerRegistry().Register("serial", NewHandler)
-	registry.HandlerRegistry().Register("com", NewHandler)
 }
 
 type serialHandler struct {
@@ -117,10 +116,12 @@ func (h *serialHandler) Handle(ctx context.Context, conn net.Conn, opts ...handl
 func (h *serialHandler) forwardSerial(ctx context.Context, conn net.Conn, target *chain.Node, log logger.Logger) (err error) {
 	var port io.ReadWriteCloser
 
+	cfg := serial_util.ParseConfigFromAddr(conn.LocalAddr().String())
+	cfg.Name = target.Addr
+
 	if opts := h.router.Options(); opts != nil && opts.Chain != nil {
-		port, err = h.router.Dial(ctx, "serial", target.Addr)
+		port, err = h.router.Dial(ctx, "serial", serial_util.AddrFromConfig(cfg))
 	} else {
-		cfg := serial_util.ParseConfigFromAddr(target.Addr)
 		cfg.ReadTimeout = h.md.timeout
 		port, err = goserial.OpenPort(cfg)
 	}

handler/unix/handler.go

@@ -0,0 +1,135 @@
+package unix
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/chain"
+	"github.com/go-gost/core/handler"
+	"github.com/go-gost/core/logger"
+	md "github.com/go-gost/core/metadata"
+	xnet "github.com/go-gost/x/internal/net"
+	"github.com/go-gost/x/registry"
+)
+
+func init() {
+	registry.HandlerRegistry().Register("unix", NewHandler)
+}
+
+type unixHandler struct {
+	hop     chain.Hop
+	router  *chain.Router
+	md      metadata
+	options handler.Options
+}
+
+func NewHandler(opts ...handler.Option) handler.Handler {
+	options := handler.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &unixHandler{
+		options: options,
+	}
+}
+
+func (h *unixHandler) Init(md md.Metadata) (err error) {
+	if err = h.parseMetadata(md); err != nil {
+		return
+	}
+
+	h.router = h.options.Router
+	if h.router == nil {
+		h.router = chain.NewRouter(chain.LoggerRouterOption(h.options.Logger))
+	}
+
+	return
+}
+
+// Forward implements handler.Forwarder.
+func (h *unixHandler) Forward(hop chain.Hop) {
+	h.hop = hop
+}
+
+func (h *unixHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) error {
+	defer conn.Close()
+
+	log := h.options.Logger
+
+	log = log.WithFields(map[string]any{
+		"remote": conn.RemoteAddr().String(),
+		"local":  conn.LocalAddr().String(),
+	})
+
+	var target *chain.Node
+	if h.hop != nil {
+		target = h.hop.Select(ctx)
+	}
+
+	if target == nil {
+		err := errors.New("target not available")
+		log.Error(err)
+		return err
+	}
+
+	log = log.WithFields(map[string]any{
+		"node": target.Name,
+		"dst":  target.Addr,
+	})
+
+	log.Debugf("%s >> %s", conn.LocalAddr(), target.Addr)
+
+	if _, _, err := net.SplitHostPort(target.Addr); err != nil {
+		return h.forwardUnix(ctx, conn, target, log)
+	}
+
+	cc, err := h.router.Dial(ctx, "tcp", target.Addr)
+	if err != nil {
+		log.Error(err)
+		if marker := target.Marker(); marker != nil {
+			marker.Mark()
+		}
+		return err
+	}
+	defer cc.Close()
+	if marker := target.Marker(); marker != nil {
+		marker.Reset()
+	}
+
+	t := time.Now()
+	log.Infof("%s <-> %s", conn.LocalAddr(), target.Addr)
+	xnet.Transport(conn, cc)
+	log.WithFields(map[string]any{
+		"duration": time.Since(t),
+	}).Infof("%s >-< %s", conn.LocalAddr(), target.Addr)
+
+	return nil
+}
+
+func (h *unixHandler) forwardUnix(ctx context.Context, conn net.Conn, target *chain.Node, log logger.Logger) (err error) {
+	var cc io.ReadWriteCloser
+
+	if opts := h.router.Options(); opts != nil && opts.Chain != nil {
+		cc, err = h.router.Dial(ctx, "unix", target.Addr)
+	} else {
+		cc, err = (&net.Dialer{}).DialContext(ctx, "unix", target.Addr)
+	}
+	if err != nil {
+		log.Error(err)
+		return err
+	}
+	defer cc.Close()
+
+	t := time.Now()
+	log.Infof("%s <-> %s", conn.LocalAddr(), target.Addr)
+	xnet.Transport(conn, cc)
+	log.WithFields(map[string]any{
+		"duration": time.Since(t),
+	}).Infof("%s >-< %s", conn.LocalAddr(), target.Addr)
+
+	return nil
+}

handler/unix/metadata.go

@@ -0,0 +1,12 @@
+package unix
+
+import (
+	mdata "github.com/go-gost/core/metadata"
+)
+
+type metadata struct {
+}
+
+func (h *unixHandler) parseMetadata(md mdata.Metadata) (err error) {
+	return
+}

internal/util/serial/serial.go

@@ -10,7 +10,6 @@ import (
 const (
 	DefaultPort     = "COM1"
 	DefaultBaudRate = 9600
-	DefaultParity   = "none"
 )
 
 // COM1,9600,odd
@@ -34,6 +33,25 @@ func ParseConfigFromAddr(addr string) *goserial.Config {
 	return cfg
 }
 
+func AddrFromConfig(cfg *goserial.Config) string {
+	ss := []string{
+		cfg.Name,
+		strconv.Itoa(cfg.Baud),
+	}
+
+	switch cfg.Parity {
+	case goserial.ParityEven:
+		ss = append(ss, "even")
+	case goserial.ParityOdd:
+		ss = append(ss, "odd")
+	case goserial.ParityMark:
+		ss = append(ss, "mark")
+	case goserial.ParitySpace:
+		ss = append(ss, "space")
+	}
+	return strings.Join(ss, ",")
+}
+
 func parseParity(s string) goserial.Parity {
 	switch strings.ToLower(s) {
 	case "o", "odd":

listener/unix/listener.go

@@ -0,0 +1,67 @@
+package unix
+
+import (
+	"net"
+
+	"github.com/go-gost/core/listener"
+	"github.com/go-gost/core/logger"
+	md "github.com/go-gost/core/metadata"
+	admission "github.com/go-gost/x/admission/wrapper"
+	climiter "github.com/go-gost/x/limiter/conn/wrapper"
+	limiter "github.com/go-gost/x/limiter/traffic/wrapper"
+	metrics "github.com/go-gost/x/metrics/wrapper"
+	"github.com/go-gost/x/registry"
+)
+
+func init() {
+	registry.ListenerRegistry().Register("unix", NewListener)
+}
+
+type unixListener struct {
+	ln      net.Listener
+	logger  logger.Logger
+	md      metadata
+	options listener.Options
+}
+
+func NewListener(opts ...listener.Option) listener.Listener {
+	options := listener.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+	return &unixListener{
+		logger:  options.Logger,
+		options: options,
+	}
+}
+
+func (l *unixListener) Init(md md.Metadata) (err error) {
+	if err = l.parseMetadata(md); err != nil {
+		return
+	}
+
+	ln, err := net.Listen("unix", l.options.Addr)
+	if err != nil {
+		return
+	}
+
+	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = admission.WrapListener(l.options.Admission, ln)
+	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
+	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
+	l.ln = ln
+
+	return
+}
+
+func (l *unixListener) Accept() (conn net.Conn, err error) {
+	return l.ln.Accept()
+}
+
+func (l *unixListener) Addr() net.Addr {
+	return l.ln.Addr()
+}
+
+func (l *unixListener) Close() error {
+	return l.ln.Close()
+}

listener/unix/metadata.go

@@ -0,0 +1,12 @@
+package unix
+
+import (
+	md "github.com/go-gost/core/metadata"
+)
+
+type metadata struct {
+}
+
+func (l *unixListener) parseMetadata(md md.Metadata) (err error) {
+	return
+}