From 1907c6c26bd10543cb2ac39c3f74b5f5a232d163 Mon Sep 17 00:00:00 2001
From: Daniel Wenzel <daniel@klenzel.de>
Date: Thu, 20 Jan 2022 10:39:13 +0100
Subject: [PATCH] =?UTF-8?q?'check=5Ftwodns.sh'=20=C3=A4ndern?=
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---
 check_twodns.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/check_twodns.sh b/check_twodns.sh
index 90f8f29..9f1f02e 100644
--- a/check_twodns.sh
+++ b/check_twodns.sh
@@ -18,13 +18,13 @@ if [ $# -ne 3 ]; then
 fi
 
 SerialMaster=$(/usr/bin/dig @${1} ${3} +short SOA | awk '{print $3}')
-if [ $? -ne 0 ]; then
+if [ $? -ne 0 ] || [ -z "$SerialMaster" ]; then
   echo "Error reading Serial from Master for Domain \"${3}\""
   exit 3
 fi
 
 SerialSlave=$(/usr/bin/dig @${2} ${3} +short SOA | awk '{print $3}')
-if [ $? -ne 0 ]; then
+if [ $? -ne 0 ] || [ -z "$SerialSlave" ]; then
   echo "Error reading Serial from Slave for Domain \"${3}\""
   exit 3
 fi
@@ -38,4 +38,4 @@ else
 fi
 
 echo $Status
-exit $STATE
+exit $STATE
\ No newline at end of file