From dd586c2ba225f25a308a91fb958c45971b925924 Mon Sep 17 00:00:00 2001
From: Vladimir Vitkov <vvitkov@linux-bg.org>
Date: Thu, 20 Oct 2016 20:47:10 +0300
Subject: [PATCH] Monitoring - SNMP based nagios check for interface status.
 Needed for LEDE/OpenWrt

---
 .../nagios3/scripts/check-interface-up.sh     | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100755 monitoring/nagios3/scripts/check-interface-up.sh

diff --git a/monitoring/nagios3/scripts/check-interface-up.sh b/monitoring/nagios3/scripts/check-interface-up.sh
new file mode 100755
index 0000000..f9f0428
--- /dev/null
+++ b/monitoring/nagios3/scripts/check-interface-up.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+#
+# Simple script to check if remote wifi if is up
+#
+# 2016.10.20 - Initial version
+#
+# copyright: 2016 Vladimir Vitkov <vvitkov@linuxbg.org>
+
+# helpers
+E_OK=0
+E_WARNING="1"
+E_CRITICAL="2"
+E_UNKNOWN="3"
+
+_community=${1}
+_hostname=${2}
+_interface=${3}
+
+# Sanity check
+if [ $# -ne 3 ]; then
+	echo "UNKNOWN: Missing parameters $0 <Community> <Hostname> <interface name>"
+	exit ${E_UNKNOWN}
+fi
+
+function find_oid() {
+	# oids
+	# .1.3.6.1.2.1.2.2.1.2 - IF-MIB::ifDescr
+	_oid=$(
+		snmpwalk \
+			-v2c \
+			-c ${_community} \
+			-On \
+			-m '' \
+			-t 1 \
+			-r 5 \
+			-Oqn \
+			${_hostname} \
+			.1.3.6.1.2.1.2.2.1.2 | \
+			egrep ${_interface} | \
+			awk '{print $1}'
+	)
+
+	echo ${_oid}
+}
+
+function check_status() {
+	# lets have the id please
+	_id=$(echo ${1} | awk -F'.' '{print $NF}')
+	# oids
+	# .1.3.6.1.2.1.2.2.1.8 - IF-MIB::ifOperStatus
+	/usr/lib/nagios/plugins/check_snmp \
+		-H ${_hostname} \
+		-P 2c \
+		-C ${_community} \
+		-c 1 \
+		-o .1.3.6.1.2.1.2.2.1.8.${_id}
+	
+	exit $?
+}
+OID=`find_oid`
+check_status ${OID}