add sni handler

pkg/listener/tls/listener.go

@@ -5,7 +5,6 @@ import (
 	"net"
 
 	"github.com/go-gost/gost/pkg/common/util"
-	tls_util "github.com/go-gost/gost/pkg/common/util/tls"
 	"github.com/go-gost/gost/pkg/listener"
 	"github.com/go-gost/gost/pkg/logger"
 	md "github.com/go-gost/gost/pkg/metadata"
@@ -55,17 +54,3 @@ func (l *tlsListener) Init(md md.Metadata) (err error) {
 	l.Listener = ln
 	return
 }
-
-func (l *tlsListener) parseMetadata(md md.Metadata) (err error) {
-	l.md.tlsConfig, err = tls_util.LoadTLSConfig(
-		md.GetString(certFile),
-		md.GetString(keyFile),
-		md.GetString(caFile),
-	)
-	if err != nil {
-		return
-	}
-
-	l.md.keepAlivePeriod = md.GetDuration(keepAlivePeriod)
-	return
-}

pkg/listener/tls/metadata.go

@@ -3,16 +3,39 @@ package tls
 import (
 	"crypto/tls"
 	"time"
-)
 
-const (
-	certFile        = "certFile"
-	keyFile         = "keyFile"
-	caFile          = "caFile"
-	keepAlivePeriod = "keepAlivePeriod"
+	tls_util "github.com/go-gost/gost/pkg/common/util/tls"
+	md "github.com/go-gost/gost/pkg/metadata"
 )
 
 type metadata struct {
 	tlsConfig       *tls.Config
 	keepAlivePeriod time.Duration
 }
+
+func (l *tlsListener) parseMetadata(md md.Metadata) (err error) {
+	const (
+		certFile        = "certFile"
+		keyFile         = "keyFile"
+		caFile          = "caFile"
+		keepAlivePeriod = "keepAlivePeriod"
+	)
+
+	if md.GetString(certFile) != "" ||
+		md.GetString(keyFile) != "" ||
+		md.GetString(caFile) != "" {
+		l.md.tlsConfig, err = tls_util.LoadTLSConfig(
+			md.GetString(certFile),
+			md.GetString(keyFile),
+			md.GetString(caFile),
+		)
+		if err != nil {
+			return
+		}
+	} else {
+		l.md.tlsConfig = tls_util.DefaultConfig
+	}
+
+	l.md.keepAlivePeriod = md.GetDuration(keepAlivePeriod)
+	return
+}