Munin contributed plugins

#!/bin/sh

#

# Plugin to monitor ARP entries per interface

#

# Parameters understood:

#

#       config   (required)

#       autoconf (optional)

#

#  Made by Sven Hartge (sven AT svenhartge DOT de)

#

#

#%# family=contrib

#%# capabilities=autoconf suggest

INTERFACE=$(basename $0 | sed 's/^arp_//g' | tr '_' '.')

if [ "$1" = "autoconf" ]; then

    # Search for arp

    which arp >/dev/null 2>/dev/null || (echo "no (can't find arp binary)" && exit 1)

    # ...or success

    echo yes

    exit 0

fi

if [ "$1" = "suggest" ]; then

    if [ -r /proc/net/dev ]; then

        egrep '^ *(eth|wlan|ath|ra)[0-9]+(\.[0-9]+)?:' /proc/net/dev | cut -f1 -d: | sed 's/ //g' | tr '.' '_'

        exit 0

    else

        exit 1

    fi

fi

if [ "$1" = "config" ]; then

    echo "graph_title ARP entries for $INTERFACE"

    echo 'graph_args --base 1000 -l 0'

    echo 'graph_vlabel Entries'

    echo 'graph_category network'

    echo 'graph_scale no'

    echo "graph_info This graph shows the number of ARP entries registered by the system for interface ${INTERFACE}."

    echo 'entries.label ARP entries'

    echo 'entries.draw LINE2'

    echo 'entries.type GAUGE'

    echo 'entries.info Number of ARP entries'

    exit 0

fi

arp -an -i "$INTERFACE" | awk 'BEGIN { regex="<incomplete>";} { if (!match($4,regex)) { a[$4] }} END{for(i in a){n++};print "entries.value " n}'