Add ECH support for QUIC based protocols

inbound/naive_quic.go

@@ -3,28 +3,39 @@
 package inbound
 
 import (
+	"github.com/sagernet/quic-go"
 	"github.com/sagernet/quic-go/http3"
+	"github.com/sagernet/sing-box/common/qtls"
 	E "github.com/sagernet/sing/common/exceptions"
 )
 
 func (n *Naive) configureHTTP3Listener() error {
-	tlsConfig, err := n.tlsConfig.Config()
+	err := qtls.ConfigureHTTP3(n.tlsConfig)
 	if err != nil {
 		return err
 	}
-	h3Server := &http3.Server{
-		Port:      int(n.listenOptions.ListenPort),
-		TLSConfig: tlsConfig,
-		Handler:   n,
-	}
 
 	udpConn, err := n.ListenUDP()
 	if err != nil {
 		return err
 	}
 
+	quicListener, err := qtls.ListenEarly(udpConn, n.tlsConfig, &quic.Config{
+		MaxIncomingStreams: 1 << 60,
+		Allow0RTT:          true,
+	})
+	if err != nil {
+		udpConn.Close()
+		return err
+	}
+
+	h3Server := &http3.Server{
+		Port:    int(n.listenOptions.ListenPort),
+		Handler: n,
+	}
+
 	go func() {
-		sErr := h3Server.Serve(udpConn)
+		sErr := h3Server.ServeListener(quicListener)
 		udpConn.Close()
 		if sErr != nil && !E.IsClosedOrCanceled(sErr) {
 			n.logger.Error("http3 server serve error: ", sErr)