Fix errNoCertificates

transport/internet/xtls/config.go

@@ -236,7 +236,7 @@ func getNewGetCertificateFunc(certs []*xtls.Certificate, rejectUnknownSNI bool)
 			}
 		}
 		if rejectUnknownSNI {
-			return nil, newError("reject unknown sni")
+			return nil, errNoCertificates
 		}
 		return certs[0], nil
 	}

transport/internet/xtls/unsafe.go

@@ -0,0 +1,6 @@
+package xtls
+
+import _ "unsafe"
+
+//go:linkname errNoCertificates crypto/tls.errNoCertificates
+var errNoCertificates error