find-port-for-hostname

#!/bin/sh -e

host=$1

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

sudo id >/dev/null

. ./shm-trunk.regex

# hide physical and trunk ports (> 10 mac, port nr <= 49)
#cat /dev/shm/snmp-mac-port/* | cut -d' ' -f1,4 | sort | uniq -c | awk '{ if ( $1 > 10 && $3 <= 49 ) print "/"$2":"$2 " .* " $3 }' > /dev/shm/trunk.regex

ping -c 1 $host | grep from > /dev/shm/port.$host.ping
# did we got resolved IP address?
if grep '(' /dev/shm/port.$host.ping >/dev/null ; then
	ip=`cat /dev/shm/port.$host.ping | cut -d' ' -f5 | tr -d '():'`
	host=`cat /dev/shm/port.$host.ping | cut -d' ' -f4`
else
	ip=`cat /dev/shm/port.$host.ping | cut -d' ' -f4 | tr -d ':'`
fi
mac=`sudo arp -a -n | grep "($ip)" | cut -d' ' -f4 | sort -u`
if [ -z "$mac" ] ; then
	bro=`./bro-conn-ip-vlan-mac.sh $ip`
	echo "# bro $bro"
	mac=`echo $bro | cut -d' ' -f3`
	test -z "$mac" && exit 1
fi
grep -r -i $mac /dev/shm/snmp-mac-port/ | tee /dev/shm/port.$host.switch | grep --file /dev/shm/trunk.regex -v | cut -d: -f2-

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