fix proxy protocol

handler/relay/connect.go

@@ -10,6 +10,7 @@ import (
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/relay"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 )
 
 func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {
@@ -40,6 +41,10 @@ func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network
 		return err
 	}
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: address})
+	}
 	cc, err := h.router.Dial(ctx, network, address)
 	if err != nil {
 		resp.Status = relay.StatusNetworkUnreachable

handler/relay/metadata.go

@@ -13,6 +13,7 @@ type metadata struct {
 	enableBind    bool
 	udpBufferSize int
 	noDelay       bool
+	hash          string
 }
 
 func (h *relayHandler) parseMetadata(md mdata.Metadata) (err error) {
@@ -21,6 +22,7 @@ func (h *relayHandler) parseMetadata(md mdata.Metadata) (err error) {
 		enableBind    = "bind"
 		udpBufferSize = "udpBufferSize"
 		noDelay       = "nodelay"
+		hash          = "hash"
 	)
 
 	h.md.readTimeout = mdutil.GetDuration(md, readTimeout)
@@ -32,5 +34,7 @@ func (h *relayHandler) parseMetadata(md mdata.Metadata) (err error) {
 	} else {
 		h.md.udpBufferSize = 1500
 	}
+
+	h.md.hash = mdutil.GetString(md, hash)
 	return
 }