I'm trying to write my first Nagios plugin to check the statuses on WLAN Controllers APs. The goal was to make a kind of "universal" plugin but I'm getting an error:
.1.3.6.1.4.1.14179.2.2.1.1.3.0.: Unknown Object Identifier ()
/usr/lib/nagios/plugins/check_wlc_ap_state.sh: line 50: [: Such Instance currently exists at this OID: integer expression expected
/usr/lib/nagios/plugins/check_wlc_ap_state.sh: line 53: [: Such Instance currently exists at this OID: integer expression expected
/usr/lib/nagios/plugins/check_wlc_ap_state.sh: line 56: [: Such Instance currently exists at this OID: integer expression expected
UNKOWN- = Such Instance currently exists at this OID
Here's my code:
#!/bin/bash
while getopts "H:C:O:N:I:w:c:h" option; do
case "$option" in
H ) host_address=$OPTARG;;
C ) host_community=$OPTARG;;
O ) ap_op_status_oid=$OPTARG;;
N ) ap_hostname_oid=$OPTARG;;
w ) warn_thresh=$OPTARG;;
c ) crit_thresh=$OPTARG;;
h ) show_help="yes";;
esac
done
# Help Menu
help_menu="Plugin to check AP operational status.
Example:
Check AP Status on Cisco CS5508
./check_wlc_ap_state.sh -H [Controller IP] -C [Controller Community] -O .1.3.6.1.4.1.14179.2.2.1.1.6.0 -N .1.3.6.1.4.1.14179.2.2.1.1.3.0 -w 2 -c 3
Required Arguments:
-H WLAN Controller Address
-C WLAN Controller RO Community String
-O OID to AP Operation Status
-N OID to AP Hostname
-c Critical Threshold
-w Warning Threshold
Optional Arguments:
-h Display help
"
if [ "$show_help" = "yes" -o $# -lt 1 ]; then
echo "$help_menu"
exit 0
fi
# Change the .1. to iso. and get the length + 1 to get rid of the trailing .
ap_op_status_oid=${ap_op_status_oid:2}
ap_op_status_oid="iso$ap_op_status_oid"
ap_op_status_oid_length=${#ap_op_status_oid}
ap_op_status_oid_length="$ap_op_status_oid_length+1"
#Get info
while read -r oid_index equal integer ap_stat;
do
ap_index="${oid_index:$ap_op_status_oid_length}"
ap_hostname=$(snmpget -c $host_community $host_address -v 1 $ap_hostname_oid.$ap_index | awk -F '"' '{print$2}')
if [ "$ap_stat" -lt "$warn_thresh" ]; then
echo -n "OK- $ap_hostname = $ap_stat | "
exit 0;
elif [ "$ap_stat" -eq "$warn_thresh" ]; then
echo -n "WARNING- $ap_hostname = $ap_stat | "
exit 1;
elif [ "$ap_stat" -ge "$crit_thresh" ]; then
echo -n "CRITICAL- $ap_hostname = $ap_stat | "
exit 2;
else
echo -n "UNKOWN- $ap_hostname = $ap_stat | "
exit 3;
fi
done < <(snmpwalk -c $host_community -v 2c $host_address $ap_op_status_oid)
And here's the input and desired output. I'm not sure about if the output is right for Nagios/Icinga2 though.
./check_wlc_ap_state.sh -H 10.77.208.12 -C r350urc31 -O .1.3.6.1.4.1.14179.2.2.1.1.6.0 -N .1.3.6.1.4.1.14179.2.2.1.1.3.0 -w 2 -c 3
OK- AP-1 = 1 | OK- AP-2 = 1 | OK- AP-3 = 1 | OK- AP-4 = 1 | OK- AP-5 = 1 | OK- AP-6 = 1 | OK- AP-7 = 1 | OK- AP-8 = 1 |
Edit: Here's the set -x
:40+ap_op_status_oid=.3.6.1.4.1.14179.2.2.1.1.6.0
:41+ap_op_status_oid=iso.3.6.1.4.1.14179.2.2.1.1.6.0
:42+ap_op_status_oid_length=31
:43+ap_op_status_oid_length=32
:46+read -r oid_index equal integer ap_stat
::69+snmpwalk -c public -v 2c 10.77.208.12 iso.3.6.1.4.1.14179.2.2.1.1.6.0
:48+oid_index=iso.3.6.1.4.1.14179.2.2.1.1.6.0.129.196.3.1.112
:49+equal==
:50+integer=INTEGER:
:51+ap_stat=1
:52+ap_index=129.196.3.1.112
::53+awk -F '"' '{print$2}'
::53+snmpget -c public 10.77.208.12 -v 1 .1.3.6.1.4.1.14179.2.2.1.1.3.0.129.196.3.1.112
:53+ap_hostname=AP-01
:55+'[' 1 -lt 2 ']'
:56+echo -n 'OK- AP-01 = 1 | '
OK- AP-01 = 1 | :57+exit 0
ap_stat contains non-numeric contents. Your code is passing it to a test operator that requires it to parse as numeric.
Use set -x to trace your script's execution; this will make this kind of situation easier to diagnose.