#!/bin/sh -e

host=$1

test -z "$host" && echo "Usage: $0 hostname" && exit 1

sudo id >/dev/null

ping -c 1 $host | grep from > /dev/shm/port.$host.ping
ip=`cat /dev/shm/port.$host.ping | cut -d' ' -f5 | tr -d '()':`
host=`cat /dev/shm/port.$host.ping | cut -d' ' -f4`
mac=`sudo arp -a -n | grep "($ip)" | cut -d' ' -f4 | sort -u`
grep -r -i $mac /dev/shm/snmp-mac-port/ | tee /dev/shm/port.$host.switch | cut -d: -f2- | egrep -v '(23|24|48|49)$' # remove trunk ports

echo "# $host $ip $mac on "`cat /dev/shm/port.$host.switch | cut -d: -f2- | cut -d' ' -f1 | sort -u | wc -l`" switches"