#!/bin/ksh93

LIC='[-?$Id$]
[-copyright?Copyright (c) 2013 Jens Elkner. All rights reserved.]
[-license?CDDL 1.0]'
SDIR=$( cd ${ dirname $0; }; printf "$PWD" )
typeset -r FPROG=${.sh.file}
typeset -r PROG=${FPROG##*/}

#MAC_PREFIX=12:34:56

typeset -r LIBNAME="${.sh.file}"
. ${LIBNAME%/*}/log.kshlib
. ${LIBNAME%/*}/man.kshlib
. ${LIBNAME%/*}/utils.kshlib


function getZoneIf {
	[[ -z $1 ]] && return
	if [[ -n ${1} ]]; then
		integer OFF=0;
		typeset LAST='' OVER='' X
		while (( OFF < 255 )); do
			X=${ dladm show-vnic -p -o over,macaddress ${1}${OFF} 2>/dev/null; }
			if [[ -z $X ]]; then
				VNIC=${1}${OFF}
				if [[ -n ${LAST} ]]; then
					MAC=${LAST#*:}
					OVER=${.sh.match%:}
					integer -i16 N=16#${MAC##*:}
					(( N++ ))
					MAC="${MAC%:*}:${N#*#}"
				fi
				break
			fi
			LAST="$X"
			(( OFF++ ))
		done
		(( OFF )) && X='-r' || X=''
		dladm show-phys -p -o link,device | sort -k2,2 -t: $X | \
		while IFS=':' read L D ; do
			[[ $L == ${OVER} ||  ${L:0:7} == 'vboxnet' ]] && continue
			DEFAULTIF=$L
			break
		done
	fi
}

function checkInUse {
	MAC=${ normalizeMac ${MAC} ; }
	typeset LINE NMAC IF
	dladm show-vnic -p -o link,macaddress | while read LINE ; do
		NMAC=${LINE#*:}
		IF=${.sh.match%:}
		NMAC=${ normalizeMac ${NMAC} ; }
		if [[ ${MAC} == ${NMAC} ]]; then
			Log.warn "+ dladm delete-vnic ${IF}"
			break
		fi
	done
}
		
function showUsage {
    typeset WHAT="$2"
    getopts -a "$PROG" "${ print ${Man.FUNC[$WHAT]}; }" OPT --man
}

Man.addFunc MAIN '' '[+NAME?'"$PROG"' - get the default interface and mac address to use for a VNIC]
[+DESCRIPTION?Determines the default interface and MAC address to use for a new virtual network interface card (vnic) for a new zone. If \azname\a is given, the zone with the given name gets taken into account and a complete \bdladm\b(1M) command gets printed, otherwise the interface and mac address, only.]
[h:help?Print this help and exit.]
[F:functions?Print out a list of all defined functions. Just invokes the \btypeset +f\b builtin.]
[H:usage]:[function?Show the usage information for the given function if available and exit. See also option \b-F\b.]
[T:trace]:[fname_list?A comma or whitspace separated list of function names, which should be traced during execution.]
\n\n[\azname\a]
'
X="${ print ${Man.FUNC[MAIN]} ; }"
while getopts "${X}" option ; do
    case "$option" in
        h) showUsage ${PROG} MAIN ; exit 0 ;;
        F) typeset +f ; exit 0 ;;
        H)  if [[ ${OPTARG%_t} != $OPTARG ]]; then
                $OPTARG --man   # self-defined types
            else
                showUsage "$OPTARG" "$OPTARG"   # function
            fi
            exit 0
            ;;
        T) typeset -ft ${OPTARG//,/ } ;;
    esac
done
X=$((OPTIND-1))
shift $X

VNIC=''
getDefaultIfAndMac
getZoneIf ${1}
checkInUse

if [[ -n ${1} ]]; then
	print "+ dladm create-vnic -m  ${MAC} -l ${DEFAULTIF} ${VNIC}"
else
	print "${DEFAULTIF} ${MAC}"
fi