openrc/net.Linux/arping.sh

# Copyright 2004-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

arping_depend() {
	program /sbin/arping
	before interface
}

arping_address() {
	local ip=${1%%/*} mac="$2" foundmac= i= w= opts=

	# We only handle IPv4 addresses
	case "${ip}" in
		0.0.0.0|0) return 1 ;;
		*.*.*.*) ;;
		*) return 1 ;;
	esac

	# We need to bring the interface up to test
	_exists "${iface}" || return 1 
	_up "${iface}"

	eval w=\$arping_wait_${IFVAR}
	[ -z "${w}" ] && w=${arping_wait:-5}

	[ -z "$(_get_inet_address)" ] && opts="${opts} -D"

	foundmac="$(arping -w "${w}" ${opts} -f -I "${IFACE}" "${ip}" 2>/dev/null | \
			sed -n -e 'y/abcdef/ABCDEF/' -e 's/.*\[\([^]]*\)\].*/\1/p')"
	[ -z "${foundmac}" ] && return 1
	
	if [ -n "${mac}" ] ; then
		if [ "${mac}" != "${foundmac}" ] ; then
			vewarn "Found ${ip} but MAC ${foundmac} does not match"
			return 1
		fi
	fi

	return 0
}

arping_start() {
	local gateways= x= conf= i=
	einfo "Pinging gateways on ${IFACE} for configuration"

	eval $(_get_array "gateways_${IFVAR}")
	if [ $# = 0 ] ; then
		eerror "No gateways have been defined (gateways_${IFVAR}=\"...\")"
		return 1
	fi

	eindent
	
	for x in "$@"; do
		eval set -- "${x}"
		local ip=$1 mac=$2 extra=

		if [ -n "${mac}" ] ; then
			mac="$(echo "${mac}" | tr '[:lower:]' '[:upper:]')"
			extra="(MAC ${mac})"
		fi

		vebegin "${ip} ${extra}"
		if arping_address "${ip}" "${mac}" ; then
			local OIFS=$IFS SIFS=${IFS-y}
			IFS=.
			for i in ${ip} ; do
				if [ "${#i}" = "2" ] ; then
					conf="${conf}0${i}"
				elif [ "${#i}" = "1" ] ; then
					conf="${conf}00${i}"
				else
					conf="${conf}${i}"
				fi
			done
			if [ "${SIFS}" = "y" ] ; then
				IFS=$OFIS
			else
				unset IFS
			fi
			[ -n "${mac}" ] && conf="${conf}_$(echo "${mac}" | sed -e 's/://g')"

			veend 0
			eoutdent
			veinfo "Configuring ${IFACE} for ${ip} ${extra}"
			_configure_variables "${conf}"

			# Call the system module as we've aleady passed it by ....
			# And it *has* to be pre_start for other things to work correctly
			system_pre_start

			# Ensure that we have a valid config - ie arping is no longer there
			eval $(_get_array "config_${IFVAR}")
			for i in "$@" ; do
				if [ "${i}" = "arping" ] ; then
					veend 1 "No config found for ${ip} (config_${conf}=\"...\")"
					continue 2
				fi
			done

			_load_config
			return 0
		fi
		veend 1
	done

	eoutdent
	return 1
}

# vim: set ts=4 :