init

go-gost/x/handler/serial/conn.go

@@ -0,0 +1,63 @@
+package serial
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/recorder"
+)
+
+type recorderConn struct {
+	net.Conn
+	recorder recorder.RecorderObject
+}
+
+func (c *recorderConn) Read(b []byte) (n int, err error) {
+	n, err = c.Conn.Read(b)
+
+	if n > 0 && c.recorder.Recorder != nil {
+		var buf bytes.Buffer
+		if c.recorder.Options != nil && c.recorder.Options.Direction {
+			buf.WriteByte('>')
+		}
+		if c.recorder.Options != nil && c.recorder.Options.TimestampFormat != "" {
+			buf.WriteString(time.Now().Format(c.recorder.Options.TimestampFormat))
+		}
+		if buf.Len() > 0 {
+			buf.WriteByte('\n')
+		}
+		if c.recorder.Options != nil && c.recorder.Options.Hexdump {
+			buf.WriteString(hex.Dump(b[:n]))
+		} else {
+			buf.Write(b[:n])
+		}
+		c.recorder.Recorder.Record(context.Background(), buf.Bytes())
+	}
+
+	return
+}
+
+func (c *recorderConn) Write(b []byte) (int, error) {
+	if c.recorder.Recorder != nil {
+		var buf bytes.Buffer
+		if c.recorder.Options != nil && c.recorder.Options.Direction {
+			buf.WriteByte('<')
+		}
+		if c.recorder.Options != nil && c.recorder.Options.TimestampFormat != "" {
+			buf.WriteString(time.Now().Format(c.recorder.Options.TimestampFormat))
+		}
+		if buf.Len() > 0 {
+			buf.WriteByte('\n')
+		}
+		if c.recorder.Options != nil && c.recorder.Options.Hexdump {
+			buf.WriteString(hex.Dump(b))
+		} else {
+			buf.Write(b)
+		}
+		c.recorder.Recorder.Record(context.Background(), buf.Bytes())
+	}
+	return c.Conn.Write(b)
+}

go-gost/x/handler/serial/handler.go

@@ -0,0 +1,139 @@
+package serial
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/chain"
+	"github.com/go-gost/core/handler"
+	"github.com/go-gost/core/hop"
+	"github.com/go-gost/core/logger"
+	md "github.com/go-gost/core/metadata"
+	"github.com/go-gost/core/recorder"
+	ctxvalue "github.com/go-gost/x/ctx"
+	xnet "github.com/go-gost/x/internal/net"
+	serial "github.com/go-gost/x/internal/util/serial"
+	xrecorder "github.com/go-gost/x/recorder"
+	"github.com/go-gost/x/registry"
+)
+
+func init() {
+	registry.HandlerRegistry().Register("serial", NewHandler)
+}
+
+type serialHandler struct {
+	hop      hop.Hop
+	md       metadata
+	options  handler.Options
+	recorder recorder.RecorderObject
+}
+
+func NewHandler(opts ...handler.Option) handler.Handler {
+	options := handler.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &serialHandler{
+		options: options,
+	}
+}
+
+func (h *serialHandler) Init(md md.Metadata) (err error) {
+	if err = h.parseMetadata(md); err != nil {
+		return
+	}
+
+	for _, ro := range h.options.Recorders {
+		if ro.Record == xrecorder.RecorderServiceHandlerSerial {
+			h.recorder = ro
+			break
+		}
+	}
+
+	return
+}
+
+// Forward implements handler.Forwarder.
+func (h *serialHandler) Forward(hop hop.Hop) {
+	h.hop = hop
+}
+
+func (h *serialHandler) 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(),
+		"sid":    ctxvalue.SidFromContext(ctx),
+	})
+
+	conn = &recorderConn{
+		Conn:     conn,
+		recorder: h.recorder,
+	}
+
+	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,
+		})
+		return h.forwardSerial(ctx, conn, target, log)
+	}
+
+	cc, err := h.options.Router.Dial(ctx, "tcp", "@")
+	if err != nil {
+		log.Error(err)
+		return err
+	}
+	defer cc.Close()
+
+	t := time.Now()
+	log.Infof("%s <-> %s", conn.LocalAddr(), "@")
+	xnet.Transport(conn, cc)
+	log.WithFields(map[string]any{
+		"duration": time.Since(t),
+	}).Infof("%s >-< %s", conn.LocalAddr(), "@")
+
+	return nil
+}
+
+func (h *serialHandler) forwardSerial(ctx context.Context, conn net.Conn, target *chain.Node, log logger.Logger) (err error) {
+	log.Debugf("%s >> %s", conn.LocalAddr(), target.Addr)
+	var port io.ReadWriteCloser
+
+	cfg := serial.ParseConfigFromAddr(conn.LocalAddr().String())
+	cfg.Name = target.Addr
+
+	if opts := h.options.Router.Options(); opts != nil && opts.Chain != nil {
+		port, err = h.options.Router.Dial(ctx, "serial", serial.AddrFromConfig(cfg))
+	} else {
+		cfg.ReadTimeout = h.md.timeout
+		port, err = serial.OpenPort(cfg)
+	}
+	if err != nil {
+		log.Error(err)
+		return err
+	}
+	defer port.Close()
+
+	t := time.Now()
+	log.Infof("%s <-> %s", conn.LocalAddr(), target.Addr)
+	xnet.Transport(conn, port)
+	log.WithFields(map[string]any{
+		"duration": time.Since(t),
+	}).Infof("%s >-< %s", conn.LocalAddr(), target.Addr)
+
+	return nil
+}

go-gost/x/handler/serial/metadata.go

@@ -0,0 +1,22 @@
+package serial
+
+import (
+	"time"
+
+	mdata "github.com/go-gost/core/metadata"
+	mdutil "github.com/go-gost/x/metadata/util"
+)
+
+const (
+	defaultPort     = "COM1"
+	defaultBaudRate = 9600
+)
+
+type metadata struct {
+	timeout time.Duration
+}
+
+func (h *serialHandler) parseMetadata(md mdata.Metadata) (err error) {
+	h.md.timeout = mdutil.GetDuration(md, "timeout", "serial.timeout", "handler.serial.timeout")
+	return
+}