add vtun listener and handler

handler/vtun/handler.go

@@ -0,0 +1,84 @@
+package tun
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/handler"
+	md "github.com/go-gost/core/metadata"
+	ctxvalue "github.com/go-gost/x/ctx"
+	"github.com/go-gost/x/registry"
+	"github.com/xjasonlyu/tun2socks/v2/core"
+)
+
+func init() {
+	registry.HandlerRegistry().Register("vtun", NewHandler)
+}
+
+type tunHandler struct {
+	options handler.Options
+}
+
+func NewHandler(opts ...handler.Option) handler.Handler {
+	options := handler.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &tunHandler{
+		options: options,
+	}
+}
+
+func (h *tunHandler) Init(md md.Metadata) (err error) {
+	if err = h.parseMetadata(md); err != nil {
+		return
+	}
+
+	return
+}
+
+func (h *tunHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) error {
+	defer conn.Close()
+
+	log := h.options.Logger
+
+	start := time.Now()
+	log = log.WithFields(map[string]any{
+		"remote": conn.RemoteAddr().String(),
+		"local":  conn.LocalAddr().String(),
+		"sid":    ctxvalue.SidFromContext(ctx),
+	})
+
+	log.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
+	defer func() {
+		log.WithFields(map[string]any{
+			"duration": time.Since(start),
+		}).Infof("%s >< %s", conn.RemoteAddr(), conn.LocalAddr())
+	}()
+
+	ep, err := newEndpoint(conn, 1420, 0, log)
+	if err != nil {
+		return err
+	}
+
+	th := newTransportHandler(log)
+	th.ProcessAsync()
+	defer th.Close()
+
+	stack, err := core.CreateStack(&core.Config{
+		LinkEndpoint:     ep,
+		TransportHandler: th,
+	})
+	if err != nil {
+		return err
+	}
+	defer stack.Close()
+
+	log.Debugf("is attached: %v", ep.IsAttached())
+
+	<-ctx.Done()
+
+	return nil
+}