From cf3688729e7ddc5c022c596606ed75612fa91a52 Mon Sep 17 00:00:00 2001
From: Shelikhoo <xiaokangwang@outlook.com>
Date: Mon, 28 Jun 2021 16:59:50 +0100
Subject: [PATCH] show explicit error to users with a incorrect fake DNS
 setting.

---
 app/dns/fakedns/fake.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/dns/fakedns/fake.go b/app/dns/fakedns/fake.go
index f7b85cfae..5aa4c2482 100644
--- a/app/dns/fakedns/fake.go
+++ b/app/dns/fakedns/fake.go
@@ -46,7 +46,7 @@ func (fkdns *Holder) Start() error {
 	if fkdns.config != nil && fkdns.config.IpPool != "" && fkdns.config.LruSize != 0 {
 		return fkdns.initializeFromConfig()
 	}
-	return nil
+	return newError("invalid fakeDNS setting")
 }
 
 func (fkdns *Holder) Close() error {
@@ -191,6 +191,8 @@ func (h *HolderMulti) Start() error {
 			if err := v.Start(); err != nil {
 				return newError("Cannot start all fake dns pools").Base(err)
 			}
+		} else {
+			return newError("invalid fakeDNS setting")
 		}
 	}
 	return nil