#!/sbin/runscript
# Copyright 1999-2003 Gentoo Technologies, Inc.
# Distributed under the terms of the GNU General Public License v2
# $Header: /home/cvsroot/gentoo-src/rc-scripts/init.d/net.eth0,v 1.34 2003/11/26 19:23:15 azarah Exp $

#NB: Config is in /etc/conf.d/net


# For pcmcia users. note that pcmcia must be added to the same
# runlevel as the net.* script that needs it.
depend() {
	use hotplug pcmcia
}

checkconfig() {
	if [ -z "${iface_IFACE}" ]
	then
		eerror "Please make sure that /etc/conf.d/net has \$iface_$IFACE set"
		return 1
	fi
	if [ -n "${vlans}" -a \! -x /sbin/vconfig ]
	then
		eerror "For VLAN (802.1q) support, emerge net-misc/vconfig"
		return 1
	fi
}

setup_env() {
	# No reason to check these multiple times in the file
	iface="${1/\./_}"
	iface_IFACE="$(eval echo \$\{iface_${iface}\})"
	dhcpcd_IFACE="$(eval echo \$\{dhcpcd_${iface}\})"
	inet6_IFACE="$(eval echo \$\{inet6_${iface}\})"
	alias_IFACE="$(eval echo \$\{alias_${iface}\})"
	status_IFACE="$(ifconfig | gawk -v IFACE="${iface}" '$0 ~ /Link/ { if ($1 == IFACE) print "up" }')"
	vlans="$(eval echo \$\{iface_${IFACE}_vlans\})"
}

iface_start() {
	local retval=0

	setup_env ${1}
	checkconfig || return 1

	local IFACE="${1}"
	ebegin "Bringing ${IFACE} up"
	if [ "${iface_IFACE}" != "dhcp" ]
	then
		/sbin/ifconfig ${IFACE} ${iface_IFACE} >/dev/null || {
			retval=$?
			eend ${retval} "Failed to bring ${IFACE} up"
			return ${retval}
		}
		# ifconfig do not always return failure ..
		/sbin/ifconfig ${IFACE} &> /dev/null || {
			retval=$?
			eend ${retval} "Failed to bring ${IFACE} up"
			return ${retval}
		}
	else
		# Check that eth0 was not brough up by the kernel ...
		if [ "${status_IFACE}" != "up" ]
		then
			/sbin/dhcpcd ${dhcpcd_IFACE} ${IFACE} >/dev/null || {
				retval=$?
				eend ${retval} "Failed to bring ${IFACE} up"
				return ${retval}
			}
		fi
	fi
	eend 0

	if [ -n "${alias_IFACE}" ]
	then
		local x=""
		local num=0
		local aliasbcast=""
		local aliasnmask=""

		ebegin "  Adding aliases"
		for x in ${alias_IFACE}
		do
			aliasbcast="$(eval echo \$\{broadcast_${iface}\} \| awk \'\{ print \$$((num + 1)) \}\')"
			if [ -n "${aliasbcast}" ]
			then
				aliasbcast="broadcast ${aliasbcast}"
			fi

			aliasnmask="$(eval echo \$\{netmask_${iface}\} \| awk \'\{ print \$$((num + 1)) \}\')"
			if [ -n "${aliasnmask}" ]
			then
				aliasnmask="netmask ${aliasnmask}"
			fi
		
			ebegin "    ${IFACE}:${num}"
			/sbin/ifconfig ${IFACE}:${num} ${x} \
				${aliasbcast} ${aliasnmask} >/dev/null
			num=$((num + 1))
			eend 0
		done
		save_options "alias" "${alias_IFACE}"
	fi

	if [ -n "${inet6_IFACE}" ]
	then
		local x=""
		ebegin "  Adding inet6 addresses"
		for x in ${inet6_IFACE}
		do
			ebegin "    ${IFACE} inet6 add ${x}"
			/sbin/ifconfig ${IFACE} inet6 add ${x} >/dev/null
			eend 0
		done
		save_options "inet6" "${inet6_IFACE}"
	fi
	
	if [ -n "${gateway}" ] && [ "${gateway%/*}" = "${IFACE}" ]
	then
		ebegin "  Setting default gateway"
		# First delete any existing routes if it was setup by kernel ..
		/sbin/route del default dev ${gateway%/*} &>/dev/null
		/sbin/route add default gw ${gateway#*/} dev ${gateway%/*} \
			netmask 0.0.0.0 metric 1 >/dev/null || {
			
			local error=$?
			ifconfig ${IFACE} down &>/dev/null
			eend ${error} "Failed to bring ${IFACE} up"
			stop
			return ${error}
		}
		eend 0
	fi

	if [ -n "$(eval echo \$\{gateway6_${IFACE}\})" ]
	then
		local x=""
		for x in $(eval echo \$\{gateway6_${IFACE}\})
		do
			ebegin "    ${IFACE} inet6 gw  ${x}"
			/sbin/route -A inet6 add default gw ${x} dev ${IFACE} > /dev/null
		done
		save_options "gateway6" "$(eval echo \$\{gateway6_${IFACE}\})"
	fi

	# Enabling rp_filter causes wacky packets to be auto-dropped by
	# the kernel.  Note that we only do this if it is not set via
	# /etc/sysctl.conf ...
	if [ -e /proc/sys/net/ipv4/conf/${IFACE}/rp_filter ] && \
	   [ -z "$(egrep '^[^#]*rp_filter' /etc/sysctl.conf 2>/dev/null)" ]
	then
		echo 1 > /proc/sys/net/ipv4/conf/${IFACE}/rp_filter
	fi
}

iface_stop() {
	local myalias="$(get_options alias)"
	local myinet6="$(get_options inet6)"

	setup_env ${1}
	local IFACE="${1}"

	ebegin "Bringing ${IFACE} down"

	# Also down the inet6 interfaces
	if [ -n "${myinet6}" ]
	then
		local x=""
		for x in ${myinet6}
		do
			/sbin/ifconfig ${IFACE} inet6 del ${x} >/dev/null
		done
	fi
	
	# Do some cleanup in case the amount of aliases change
	if [ -n "${myalias}" ]
	then
		local x=""
		local num=0
		for x in ${myalias}
		do
			/sbin/ifconfig ${IFACE}:${num} down >/dev/null
			num=$((num + 1))
		done
	fi

	if [ "${iface_IFACE}" = "dhcp" ]
	then
		local count=0
		while /sbin/dhcpcd -z ${IFACE} &>/dev/null && [ "${count}" -lt 9 ]
		do
			# Give dhcpcd time to properly shutdown
			sleep 1
			count=$((count + 1))
		done
		if [ "${count}" -ge 9 ]
		then
			eerror "Timed out trying to stop dhcpcd"
		fi
	else
		/sbin/ifconfig ${IFACE} down >/dev/null
	fi
	eend 0
}

start() {
	iface_start ${IFACE} || return 1
	for vlan in ${vlans}
	do
		/sbin/vconfig add ${IFACE} ${vlan} >/dev/null
		iface_start ${IFACE}.${vlan}
	done
}

stop () {
	setup_env ${IFACE}
	checkconfig || return 1
	for vlan in ${vlans}
	do
		iface_stop ${IFACE}.${vlan}
		/sbin/vconfig rem ${IFACE}.${vlan} >/dev/null
	done
	iface_stop ${IFACE}
}

# vim:ts=4