improvment, implements it as postup/predown functions (all changes at bottom now)

net.eth0 (text/plain), 8.91 KB, created by Evan Teran on 2004-05-04 20:57:56 UTC

#!/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 1.37 2004/04/14 17:27:34 agriffis Exp $

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

if [[ -n $NET_DEBUG ]]; then
	set -x
	devnull=/dev/stderr
else
	devnull=/dev/null
fi

# 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 "${ifconfig_IFACE}" ]]; then
		eerror "Please make sure that /etc/conf.d/net has \$ifconfig_$IFACE set"
		eerror "(or \$iface_$IFACE for old-style configuration)"
		return 1
	fi
	if [[ -n "${vlans_IFACE}" && ! -x /sbin/vconfig ]]; then
		eerror "For VLAN (802.1q) support, emerge net-misc/vconfig"
		return 1
	fi
}

# setup_vars: setup variables based on $1 and content of /etc/conf.d/net
# The following variables are set, which should be declared local by
# the calling routine.
#	status_IFACE	(up or '')
#	vlans_IFACE		(space-separated list)
#	ifconfig_IFACE	(array of ifconfig lines, replaces iface_IFACE)
#	dhcpcd_IFACE	(command-line args for dhcpcd)
#	routes_IFACE	(array of route lines)
#	inet6_IFACE		(array of inet6 lines)
setup_vars() {
	local i iface="${1//\./_}"

	status_IFACE="$(ifconfig ${1} 2>${devnull} | gawk '$1 == "UP" {print "up"}')"
	eval vlans_IFACE=\"\$\{iface_${iface}_vlans\}\"
	eval ifconfig_IFACE=( \"\$\{ifconfig_$iface\[@\]\}\" )
	eval dhcpcd_IFACE=\"\$\{dhcpcd_$iface\}\"
	eval routes_IFACE=( \"\$\{routes_$iface\[@\]\}\" )
	eval inet6_IFACE=( \"\$\{inet6_$iface\[@\]\}\" )

	# BACKWARD COMPATIBILITY: populate the ifconfig_IFACE array
	# if iface_IFACE is set (fex. iface_eth0 instead of ifconfig_eth0)
	eval local iface_IFACE=\"\$\{iface_$iface\}\"
	if [[ -n ${iface_IFACE} && -z ${ifconfig_IFACE} ]]; then
		# Make sure these get evaluated as arrays
		local -a aliases broadcasts netmasks

		# Start with the primary interface
		ifconfig_IFACE=( "${iface_IFACE}" )

		# ..then add aliases
		eval aliases=( \$\{alias_$iface\} )
		eval broadcasts=( \$\{broadcast_$iface\} )
		eval netmasks=( \$\{netmask_$iface\} )
		for ((i = 0; i < ${#aliases[@]}; i = i + 1)); do
			ifconfig_IFACE[i+1]="${aliases[i]} ${broadcasts[i]:+broadcast ${broadcasts[i]}} ${netmasks[i]:+netmask ${netmasks[i]}}"
		done
	fi

	# BACKWARD COMPATIBILITY: check for space-separated inet6 addresses
	if [[ ${#inet6_IFACE[@]} == 1 && ${inet6_IFACE} == *' '* ]]; then
		inet6_IFACE=( ${inet6_IFACE} )
	fi
}

iface_start() {
	local IFACE=${1} i x
	checkconfig || return 1

	if [[ ${ifconfig_IFACE} != dhcp ]]; then
		# Show the address, but catch if this interface will be inet6 only
		i=${ifconfig_IFACE%% *}
		if [[ ${i} == *.*.*.* ]]; then
			ebegin "Bringing ${IFACE} up (${i})"
		else
			ebegin "Bringing ${IFACE} up"
		fi
		# ifconfig does not always return failure ..
		/sbin/ifconfig ${IFACE} ${ifconfig_IFACE} >${devnull} && \
		/sbin/ifconfig ${IFACE} &>${devnull}
		eend $? || return $?
	else
		# Check that eth0 was not brought up by the kernel ...
		if [[ ${status_IFACE} == up ]]; then
			einfo "Keeping kernel configuration for ${IFACE}"
		else
			ebegin "Bringing ${IFACE} up via DHCP"
			/sbin/dhcpcd ${dhcpcd_IFACE} ${IFACE}
			eend $? || return $?
		fi
		# Show address retrieved
		i=$(ifconfig ${IFACE} | grep -m1 -o 'inet addr:[^ ]*' | cut -d: -f2)
		[[ -n ${i} ]] && einfo "  ${IFACE} received address ${i}"

	fi

	if [[ ${#ifconfig_IFACE[@]} -gt 1 ]]; then
		einfo "  Adding aliases"
		for ((i = 1; i < ${#ifconfig_IFACE[@]}; i = i + 1)); do
			ebegin "    ${IFACE}:${i} (${ifconfig_IFACE[i]%% *})"
			/sbin/ifconfig ${IFACE}:${i} ${ifconfig_IFACE[i]}
			eend $?
		done
	fi

	if [[ -n ${inet6_IFACE} ]]; then
		einfo "  Adding inet6 addresses"
		for ((i = 0; i < ${#inet6_IFACE[@]}; i = i + 1)); do
			ebegin "    ${IFACE} inet6 add ${inet6_IFACE[i]}"
			/sbin/ifconfig ${IFACE} inet6 add ${inet6_IFACE[i]} >${devnull}
			eend $?
		done
	fi

	# Set static routes
	if [[ -n ${routes_IFACE} ]]; then
		einfo "  Adding routes"
		for ((i = 0; i < ${#routes_IFACE[@]}; i = i + 1)); do
			ebegin "    ${routes_IFACE[i]}"
			/sbin/route add ${routes_IFACE[i]}
			eend $?
		done
	fi

	# Set default route if applicable to this interface
	if [[ ${gateway} == ${IFACE}/* ]]; then
		local ogw=$(/bin/netstat -rn | awk '$1 == "0.0.0.0" {print $2}')
		local gw=${gateway#*/}
		if [[ ${ogw} != ${gw} ]]; then
			ebegin "  Setting default gateway ($gw)"

			# First delete any existing route if it was setup by kernel...
			/sbin/route del default dev ${IFACE} &>${devnull}

			# Second delete old gateway if it was set...
			/sbin/route del default gw ${ogw} &>${devnull}

			# Third add our new default gateway
			/sbin/route add default gw ${gw} >${devnull}
			eend $? || {
				true # need to have some command in here
				# Note: This originally called stop, which is obviously
				# wrong since it's calling with a local version of IFACE.
				# The below code works correctly to abort configuration of
				# the interface, but is commented because we're assuming
				# that default route failure should not cause the interface
				# to be unconfigured.
				#local error=$?
				#ewarn "Aborting configuration of ${IFACE}"
				#iface_stop ${IFACE}
				#return ${error}
			}
		fi
	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/${IFACE}/rp_filter && \
			-z "$(grep -s '^[^#]*rp_filter' /etc/sysctl.conf)" ]]; then
		echo -n 1 > /proc/sys/net/ipv4/conf/${IFACE}/rp_filter
	fi
}

# iface_stop: bring down an interface.  Don't trust information in
# /etc/conf.d/net since the configuration might have changed since
# iface_start ran.  Instead query for current configuration and bring
# down the interface.
iface_stop() {
	local IFACE=${1} i x aliases inet6 count

	# Try to do a simple down (no aliases, no inet6, no dhcp)
	aliases="$(/sbin/ifconfig | grep -o "^$IFACE:[0-9]*" | tac)"
	inet6="$(ifconfig ${IFACE} | awk '$1 == "inet6" {print $2}')"
	if [[ -z ${aliases} && -z ${inet6} && ! -e /var/run/dhcpcd-${IFACE}.pid ]]; then
		ebegin "Bringing ${IFACE} down"
		/sbin/ifconfig ${IFACE} down &>/dev/null
		eend 0
		return 0
	fi

	einfo "Bringing ${IFACE} down"

	# Stop aliases before primary interface.
	# Note this must be done in reverse order, since ifconfig eth0:1 
	# will remove eth0:2, etc.  It might be sufficient to simply remove 
	# the base interface but we're being safe here.
	for i in ${aliases} ${IFACE}; do
	
		# Delete all the inet6 addresses for this interface
		inet6="$(ifconfig ${i} | awk '$1 == "inet6" {print $3}')"
		if [[ -n ${inet6} ]]; then
			einfo "  Removing inet6 addresses"
			for x in ${inet6}; do 
				ebegin "    ${IFACE} inet6 del ${x}"
				/sbin/ifconfig ${i} inet6 del ${x}
				eend $?
			done
		fi

		# Stop DHCP (should be N/A for aliases)
		# Don't trust current configuration... investigate ourselves
		if /sbin/dhcpcd -z ${i} &>${devnull}; then
			
			ebegin "  Releasing DHCP lease for ${IFACE}"
			for ((count = 0; count < 9; count = count + 1)); do
				/sbin/dhcpcd -z ${i} &>${devnull} || break
				sleep 1
			done
			[[ ${count} -lt 9 ]]
			eend $? "Timed out"
			
			
		fi
		ebegin "  Stopping ${i}"
		/sbin/ifconfig ${i} down &>${devnull}
		eend 0
	done

	return 0
}

start() {
	# These variables are set by setup_vars
	local status_IFACE vlans_IFACE dhcpcd_IFACE 
	local -a ifconfig_IFACE routes_IFACE inet6_IFACE

	# Call user-defined preup function if it exists
	if [[ $(type -t preup) == function ]]; then
		einfo "Running preup function"
		preup ${IFACE} || {
			eerror "preup ${IFACE} failed"
			return 1
		}
	fi

	# Start the primary interface and aliases
	setup_vars ${IFACE}
	iface_start ${IFACE} || return 1

	# Start vlans
	local vlan
	for vlan in ${vlans_IFACE}; do
		/sbin/vconfig add ${IFACE} ${vlan} >${devnull}
		setup_vars ${IFACE}.${vlan}
		iface_start ${IFACE}.${vlan}
	done

	# Call user-defined postup function if it exists
	if [[ $(type -t postup) == function ]]; then
		einfo "Running postup function"
		postup ${IFACE}
	fi
}

stop() {
	# Call user-defined predown function if it exists
	if [[ $(type -t predown) == function ]]; then
		einfo "Running predown function"
		predown ${IFACE}
	fi

	# Don't depend on setup_vars since configuration might have changed.
	# Investigate current configuration instead.
	local vlan
	for vlan in $(ifconfig | grep -o "^${IFACE}\.[^ ]*"); do
		iface_stop ${vlan}
		/sbin/vconfig rem ${vlan} >${devnull}
	done

	iface_stop ${IFACE} || return 1  # always succeeds, btw

	# Call user-defined postdown function if it exists
	if [[ $(type -t postdown) == function ]]; then
		einfo "Running postdown function"
		postdown ${IFACE}
	fi
}

postup() {
	i=$(ifconfig ${IFACE} | grep -m1 -o 'inet addr:[^ ]*' | cut -d: -f2)
	echo "${i} `hostname` # added by DHCP" >> /etc/hosts
}

predown() {
	i=$(ifconfig ${IFACE} | grep -m1 -o 'inet addr:[^ ]*' | cut -d: -f2)
	sed -i "/^${i} `hostname` # added by DHCP$/ d" /etc/hosts
}

# vim:ts=4