fix dtls connection

listener/dtls/listener.go

@@ -12,6 +12,7 @@ import (
 	admission "github.com/go-gost/x/admission/wrapper"
 	xnet "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/internal/net/proxyproto"
+	xdtls "github.com/go-gost/x/internal/util/dtls"
 	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"
@@ -88,7 +89,12 @@ func (l *dtlsListener) Init(md md.Metadata) (err error) {
 }
 
 func (l *dtlsListener) Accept() (conn net.Conn, err error) {
-	return l.ln.Accept()
+	c, err := l.ln.Accept()
+	if err != nil {
+		return
+	}
+	conn = xdtls.Conn(c, l.md.bufferSize)
+	return
 }
 
 func (l *dtlsListener) Addr() net.Addr {

listener/dtls/metadata.go

@@ -7,19 +7,24 @@ import (
 	mdutil "github.com/go-gost/core/metadata/util"
 )
 
+const (
+	defaultBufferSize = 1200
+)
+
 type metadata struct {
 	mtu            int
+	bufferSize     int
 	flightInterval time.Duration
 }
 
 func (l *dtlsListener) parseMetadata(md mdata.Metadata) (err error) {
-	const (
-		mtu            = "mtu"
-		flightInterval = "flightInterval"
-	)
+	l.md.mtu = mdutil.GetInt(md, "dtls.mtu", "mtu")
+	l.md.bufferSize = mdutil.GetInt(md, "dtls.bufferSize", "bufferSize")
+	if l.md.bufferSize <= 0 {
+		l.md.bufferSize = defaultBufferSize
+	}
 
-	l.md.mtu = mdutil.GetInt(md, mtu)
-	l.md.flightInterval = mdutil.GetDuration(md, flightInterval)
+	l.md.flightInterval = mdutil.GetDuration(md, "dtls.flightInterval", "flightInterval")
 
 	return nil
 }