#!/bin/ksh
#
################################################################################
#
# Tries to determine the global name for the local/non-global zone
# by using arp.
# May not always be accurate or sucessful.
#
# Written by Matt Baker  mbaker@computeranddata.com
# 8/22/2008
# Version 1.0
#
################################################################################

if [[ $(uname) == SunOS  && $(uname -r | awk -F. '{print $2}') -ge 10 ]]
then
    if [[ $(zonename) != global ]]
    then
	ping  $(hostname)
	MYZONEIP=$(grep -w $(hostname) /etc/hosts | awk '{print $1}')
	MYZONEMAC=$(/usr/sbin/arp -na \
			| grep $MYZONEIP \
                    	| awk '{print $NF}')
	MYZONEVIPS=$(ifconfig -a | grep inet \
				 | grep -v 127.0.0.1 \
				 | awk '{print $2}'\
				 | grep -v $MYZONEIP )
	MYZONEVIPS=$(echo $MYZONEVIPS | sed -e 's/ /|/')

	#
	# give it something dumb so I don't have to make another test case
	#
	if [[ -z $MYZONEVIPS ]]
	then
		MYZONEVIPS="0.0.0.0|0.0.0.1"
	fi	

        print -n "My possible Globals are: "
		GLOBAL=$(/usr/sbin/arp -na \
				| grep $MYZONEMAC \
				| egrep -v "$MYZONEVIPS" \
				| awk '{print $2}' \
				| sort )
		
		if [[ -n $GLOBAL ]]
		then
			print "$GLOBAL"
		else
			print "ERROR:1: CANNOT FIND GLOBALNAME - Sorry."
			exit 1
		fi
    else
        print "ERROR:3: You already in a global zone, use 'zoneadm list -civ'."
        exit 3
    fi

else
    print "ERROR:2: Only works on Solaris 10 or greater."
    exit 2
fi