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#!/bin/bash
# https://ixnfo.com/en/snmp-oid-and-mib-for-interfaces.html
# https://oidref.com/1.3.6.1.2.1.2.2.1
RESULTS=(OK WARNING CRITICAL UNKNOWN)
perror() {
echo "$@"
} >&2
fail() {
local RET=$1
shift
perror "$@"
exit $RET
}
result() {
local RET=$1
shift
echo -n "SNMP IF ${RESULTS[$RET]}: $@"
perfdata
exit $RET
}
walk() {
snmpwalk -c "$COMMUNITY" -v 2c "$HOSTNAME" "1.3.6.1.2.1.2.2.1.$1.$INTERFACE"
return $?
}
extract_val() {
sed -n 's/.*=\(.*\)/\1/p' | sed -n 's/.*:\s*\(.*\)/\1/p'
}
perfdata() {
[ $GENPERFDATA -eq 0 ] && return
echo -n "| "
echo -n "in=$INOCTETS "
echo -n "out=$OUTOCTETS "
echo -n "in_err=$INERRORS "
echo -n "out_err=$OUTERRORS "
echo
}
GENPERFDATA=0
while getopts ":H:c:i:" opt; do
case $opt in
H)
HOSTNAME="$OPTARG"
;;
c)
COMMUNITY="$OPTARG"
;;
i)
INTERFACE="$OPTARG"
;;
:)
fail 3 "$OPTARG requires Argument."
;;
*)
fail 3 "Invalid option $OPTARG"
esac
done
SNMPWALK_RESULT=$(snmpwalk -c "$COMMUNITY" -v 2c "$HOSTNAME" 1.3.6.1.2.1.2.2.1.8.$INTERFACE; exit $?)
RET=$?
[ $RET -ne 0 ] && result 3 "snmpwalk failed with code $RET: $SNMPWALK_RESULT"
[ -z "$SNMPWALK_RESULT" ] && result 2 "No matching entry found."
GENPERFDATA=1
INOCTETS=$(walk 10 | extract_val)
OUTOCTETS=$(walk 16 | extract_val)
INERRORS=$(walk 14 | extract_val)
OUTERRORS=$(walk 20 | extract_val)
sed -n 's/.*=\(.*\)/\1/p' <<< "$SNMPWALK_RESULT" | grep "up\|1" > /dev/null && result 0 "Interface $INTERFACE is up."
result 2 "Interface $INTERFACE is not up: $SNMPWALK_RESULT"
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