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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
# https://bestmonitoringtools.com/mibdb/mibdb_search.php?mib=IF-MIB
RESULTS=(OK WARNING CRITICAL UNKNOWN)
readonly MIB_IFOPERSTATUS="1.3.6.1.2.1.2.2.1.8"
readonly MIB_ALIAS="1.3.6.1.2.1.31.1.1.1.18"
readonly MIB_NAME="1.3.6.1.2.1.31.1.1.1.1"
readonly MIB_IN="1.3.6.1.2.1.31.1.1.1.6"
readonly MIB_OUT="1.3.6.1.2.1.31.1.1.1.10"
readonly MIB_ERR_IN="1.3.6.1.2.1.2.2.1.14"
readonly MIB_ERR_OUT="1.3.6.1.2.1.2.2.1.20"
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 $AUTH "$HOSTNAME" "$1"
return $?
}
extract_val() {
sed -n 's/.*=\(.*\)/\1/p' | sed -n 's/.*:\s*\(.*\)/\1/p' | tr -d "\"'"
}
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:u:p:" opt; do
case $opt in
H)
HOSTNAME="$OPTARG"
;;
c)
COMMUNITY="$OPTARG"
;;
i)
INTERFACE="$OPTARG"
;;
u)
SNMP_USER="$OPTARG"
;;
p)
SNMP_PW="$OPTARG"
;;
:)
fail 3 "$OPTARG requires Argument."
;;
*)
fail 3 "Invalid option $OPTARG"
esac
done
AUTH=""
if [ -n "$COMMUNITY" ]; then
AUTH="-c $COMMUNITY -v 2c"
elif [ -n "$SNMP_USER" ] && [ -n "$SNMP_PW" ]; then
AUTH="-v 3 -u $SNMP_USER -A $SNMP_PW -l authNoPriv"
else
result 3 "No or insufficient authentication info provided"
fi
SNMPWALK_RESULT=$(walk "$MIB_IFOPERSTATUS.$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
NAME=$(walk "$MIB_NAME.$INTERFACE" | extract_val)
ALIAS=$(walk "$MIB_ALIAS.$INTERFACE" | extract_val)
COMPLETE_NAME="$NAME"
if [ -n "$ALIAS" ]; then COMPLETE_NAME+=" ($ALIAS)"; fi
INOCTETS=$(walk "$MIB_IN.$INTERFACE" | extract_val)
OUTOCTETS=$(walk "$MIB_OUT.$INTERFACE" | extract_val)
INERRORS=$(walk "$MIB_ERR_IN.$INTERFACE" | extract_val)
OUTERRORS=$(walk "$MIB_ERR_OUT.$INTERFACE" | extract_val)
extract_val <<< "$SNMPWALK_RESULT" | grep "up\|1" > /dev/null && result 0 "$COMPLETE_NAME is up."
result 2 "$COMPLETE_NAME $INTERFACE is not up: $SNMPWALK_RESULT"
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