[update] rc-script for starting network-interfaces

net.eth0 (text/plain), 4.89 KB, created by Michael Sliwak on 2003-08-14 08:38:23 UTC

#!/sbin/runscript
# Copyright 1999-2003 Gentoo Technologies, Inc.
# Distributed under the terms of the GNU General Public License v2
# $Header: /opt/cvsroot/rc-scripts/net.eth0,v 1.2 2003/08/14 11:49:24 ms Exp $
#
# Modified by Michael Sliwak <[e-mail]>

#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
}

setup_env() {
	# No reason to check these multiple times in the file
	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}" '/Link/ { if ($1 == IFACE) print "up" }')"
}

start() {
	local retval=0

	setup_env
	checkconfig || return 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
			if [ -f /sbin/mii-diag ]
			then
				# Check if cable is plugged into the interface
				/sbin/ifconfig ${IFACE} up
				/sbin/mii-diag -s ${IFACE} >/dev/null || {
					retval=$?
					/sbin/ifconfig ${IFACE} down
					einfo "There is no cable plugged into ${IFACE}"
					einfo "Due to faster startup dhcpcd has not been started"
					einfo "Plug in the cable and start manually ;-)"
					eend ${retval} "DHCP-Client not started on ${IFACE}"
					return ${retval}
				}
				/sbin/ifconfig ${IFACE} down
			
				# Starting DHCP-Client
				/sbin/dhcpcd ${dhcpcd_IFACE} -t 10 ${IFACE} >/dev/null || {
					retval=$?
					eend ${retval} "Failed to bring ${IFACE} up"
					return ${retval}
				}
			else
				retval=$?
				einfo "mii-diag is not installed on the system"
				einfo "However it is required to run this script"
				einfo "Please install mii-diag"
				eend ${retval} "run \"emerge mii-diag\""
				return ${retval}
			fi
		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

	# Enabling rp_filter causes wacky packets to be auto-dropped by
	# the kernel
	if [ -e /proc/sys/net/ipv4/conf/${IFACE}/rp_filter ]
	then
		echo 1 > /proc/sys/net/ipv4/conf/${IFACE}/rp_filter
	fi
}

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

	setup_env

	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 -k ${IFACE} &>/dev/null && [ "${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
}


# vim:ts=4