updates from 2021-04-21

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

conf/filewriter.go

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
+ */
+
+package conf
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+)
+
+func randomFileName() string {
+	var randBytes [32]byte
+	_, err := rand.Read(randBytes[:])
+	if err != nil {
+		panic(err)
+	}
+	return hex.EncodeToString(randBytes[:]) + ".tmp"
+}