From 2f756409d90b166ea81a92673595a4aa0924ef82 Mon Sep 17 00:00:00 2001
From: Daniel Wenzel <daniel@klenzel.de>
Date: Thu, 20 Jan 2022 10:32:25 +0100
Subject: [PATCH] =?UTF-8?q?'check=5Ftwodns.sh'=20hinzuf=C3=BCgen?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 check_twodns.sh | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 check_twodns.sh

diff --git a/check_twodns.sh b/check_twodns.sh
new file mode 100644
index 0000000..90f8f29
--- /dev/null
+++ b/check_twodns.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# Return Codes:
+# 0 - Ok!       - Up
+# 1 - Warning   - Flaky
+# 2 - Critical  - Down
+# 3 - Unknown   - Ummm... What happened?!
+
+STATE=3
+
+print_usage() {
+        echo "Usage: check_twodns.sh [Master DNS] [Slave DNS] [Zone]"
+}
+
+#Parameter prüfen
+if [ $# -ne 3 ]; then
+  print_usage
+  exit $STATE
+fi
+
+SerialMaster=$(/usr/bin/dig @${1} ${3} +short SOA | awk '{print $3}')
+if [ $? -ne 0 ]; then
+  echo "Error reading Serial from Master for Domain \"${3}\""
+  exit 3
+fi
+
+SerialSlave=$(/usr/bin/dig @${2} ${3} +short SOA | awk '{print $3}')
+if [ $? -ne 0 ]; then
+  echo "Error reading Serial from Slave for Domain \"${3}\""
+  exit 3
+fi
+
+if [ "$SerialMaster" -eq "$SerialSlave" ]; then
+  Status="Serial for \"${3}\" is identical on both DNS-Servers: ${SerialMaster}"
+  STATE=0
+else
+  echo "Serial for \"${3}\" is different. Master: ${SerialMaster}, Slave: ${SerialSlave}"
+  STATE=2
+fi
+
+echo $Status
+exit $STATE