add tunnel feature for relay

handler/relay/entrypoint.go

@@ -0,0 +1,170 @@
+package relay
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/handler"
+	"github.com/go-gost/core/ingress"
+	"github.com/go-gost/core/listener"
+	md "github.com/go-gost/core/metadata"
+	"github.com/go-gost/relay"
+	admission "github.com/go-gost/x/admission/wrapper"
+	xnet "github.com/go-gost/x/internal/net"
+	"github.com/go-gost/x/internal/net/proxyproto"
+	"github.com/go-gost/x/internal/util/forward"
+	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/google/uuid"
+)
+
+type epListener struct {
+	ln      net.Listener
+	options listener.Options
+}
+
+func NewEntryPointListener(opts ...listener.Option) listener.Listener {
+	options := listener.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+	return &epListener{
+		options: options,
+	}
+}
+
+func (l *epListener) Init(md md.Metadata) (err error) {
+	network := "tcp"
+	if xnet.IsIPv4(l.options.Addr) {
+		network = "tcp4"
+	}
+	ln, err := net.Listen(network, l.options.Addr)
+	if err != nil {
+		return
+	}
+
+	// l.logger.Debugf("pp: %d", l.options.ProxyProtocol)
+
+	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
+	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 *epListener) Accept() (conn net.Conn, err error) {
+	return l.ln.Accept()
+}
+
+func (l *epListener) Addr() net.Addr {
+	return l.ln.Addr()
+}
+
+func (l *epListener) Close() error {
+	return l.ln.Close()
+}
+
+type epHandler struct {
+	pool    *ConnectorPool
+	ingress ingress.Ingress
+	options handler.Options
+}
+
+func NewEntryPointHandler(pool *ConnectorPool, ingress ingress.Ingress, opts ...handler.Option) handler.Handler {
+	options := handler.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &epHandler{
+		pool:    pool,
+		ingress: ingress,
+		options: options,
+	}
+}
+
+func (h *epHandler) Init(md md.Metadata) (err error) {
+	return
+}
+
+func (h *epHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) error {
+	defer conn.Close()
+
+	start := time.Now()
+	log := h.options.Logger.WithFields(map[string]any{
+		"remote": conn.RemoteAddr().String(),
+		"local":  conn.LocalAddr().String(),
+	})
+
+	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())
+	}()
+
+	var rw io.ReadWriter = conn
+	var host string
+	var protocol string
+	rw, host, protocol, _ = forward.Sniffing(ctx, conn)
+	h.options.Logger.Debugf("sniffing: host=%s, protocol=%s", host, protocol)
+
+	var tunnelID relay.TunnelID
+	if h.ingress != nil {
+		v := h.ingress.Get(host)
+		uuid, _ := uuid.Parse(v)
+		copy(tunnelID[:], uuid[:])
+	}
+	log = log.WithFields(map[string]any{
+		"tunnel": tunnelID.String(),
+	})
+
+	var cc net.Conn
+	var err error
+	for i := 0; i < 3; i++ {
+		c := h.pool.Get(tunnelID)
+		if c == nil {
+			err = fmt.Errorf("tunnel %s not available", tunnelID.String())
+			break
+		}
+
+		cc, err = c.Session().GetConn()
+		if err != nil {
+			log.Error(err)
+			continue
+		}
+		break
+	}
+	if err != nil {
+		log.Error(err)
+		return err
+	}
+	defer cc.Close()
+
+	log.Debugf("%s >> %s", conn.RemoteAddr(), cc.RemoteAddr())
+
+	af := &relay.AddrFeature{}
+	af.ParseFrom(conn.RemoteAddr().String())
+	resp := relay.Response{
+		Version:  relay.Version1,
+		Status:   relay.StatusOK,
+		Features: []relay.Feature{af},
+	}
+	resp.WriteTo(cc)
+
+	t := time.Now()
+	log.Debugf("%s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())
+	xnet.Transport(rw, cc)
+	log.WithFields(map[string]any{
+		"duration": time.Since(t),
+	}).Debugf("%s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())
+
+	return nil
+}