pfSense

#!/bin/sh

#

# $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $

# $FreeBSD: src/sbin/dhclient/dhclient-script,v 1.4 2005/06/10 03:41:18 brooks Exp $

#

# Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org>

#

# Permission to use, copy, modify, and distribute this software for any

# purpose with or without fee is hereby granted, provided that the above

# copyright notice and this permission notice appear in all copies.

#

# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

#

#

NETSTAT=/usr/bin/netstat

GREP=/usr/bin/grep

AWK=/usr/bin/awk

HOSTNAME=/bin/hostname

LOCALHOST=127.0.0.1

if [ -x /usr/bin/logger ]; then

	LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"

else

	LOGGER=echo

fi

#

# Helper functions that implement common actions.

#

check_hostname() {

	current_hostname=`$HOSTNAME`

	if [ -z "$current_hostname" ]; then

		$LOGGER "New Hostname ($interface): $new_host_name"

		$HOSTNAME $new_host_name

	elif [ "$current_hostname" = "$old_host_name" -a \

	       "$new_host_name" != "$old_host_name" ]; then

		$LOGGER "New Hostname ($interface): $new_host_name"

		$HOSTNAME $new_host_name

	fi

}

arp_flush() {

	arp -an -i $interface | \

		sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \

		sh >/dev/null 2>&1

}

delete_old_address() {

	ifconfig $interface inet -alias $old_ip_address $medium

}

add_new_address() {

	ifconfig $interface \

		inet $new_ip_address \

		netmask $new_subnet_mask \

		broadcast $new_broadcast_address \

		$medium

	$LOGGER "New IP Address ($interface): $new_ip_address"

	$LOGGER "New Subnet Mask ($interface): $new_subnet_mask"

	$LOGGER "New Broadcast Address ($interface): $new_broadcast_address"

	$LOGGER "New Routers ($interface): $new_routers"

        echo $new_routers > /tmp/${interface}_router

}

delete_old_alias() {

	if [ -n "$alias_ip_address" ]; then

		ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1

		route delete $alias_ip_address $LOCALHOST > /dev/null 2>&1

	fi

}

add_new_alias() {

	if [ -n "$alias_ip_address" ]; then

		ifconfig $interface inet alias $alias_ip_address netmask \

		    $alias_subnet_mask

		route add $alias_ip_address $LOCALHOST

	fi

}

delete_old_routes() {

	route delete "$old_ip_address" $LOCALHOST >/dev/null 2>&1

	for router in $old_routers; do

		if [ $if_defaultroute = x -o $if_defaultroute = $interface ]; then

			route delete default $route >/dev/null 2>&1

                        rm -f /tmp/${interface}_router

		fi

	done

	if [ -n "$old_static_routes" ]; then

		set $old_static_routes

		while [ $# -gt 1 ]; do

			route delete "$1" "$2"

			shift; shift

                        rm -f /tmp/${interface}_router

		done

	fi

	arp_flush

}

add_new_routes() {

	route add $new_ip_address $LOCALHOST >/dev/null 2>&1

	for router in $new_routers; do

		if [ "$new_ip_address" = "$router" ]; then

			route add default -iface $router >/dev/null 2>&1

		else

			route add default $router >/dev/null 2>&1

                        echo $new_routers > /tmp/${interface}_router

		fi

		# 2nd and subsequent default routers error out, so explicitly

		# stop processing the list after the first one.

		break

	done

	if [ -n "$new_static_routes" ]; then

		$LOGGER "New Static Routes ($interface): $new_static_routes"

		set $new_static_routes

		while [ $# -gt 1 ]; do

			route add $1 $2

			shift; shift

                        echo $new_routers > /tmp/${interface}_router

		done

	fi

}

add_new_resolv_conf() {

	# XXX Old code did not create/update resolv.conf unless both

	# $new_domain_name and $new_domain_name_servers were provided.  PR

	# #3135 reported some ISP's only provide $new_domain_name_servers and

	# thus broke the script. This code creates the resolv.conf if either

	# are provided.

	rm -f /var/etc/resolv.conf.std

	if [ -n "$new_domain_name" ]; then

		echo "search $new_domain_name" >>/var/etc/resolv.conf.std

	fi

	rm -f /var/etc/nameservers.conf

	if [ -n "$new_domain_name_servers" ]; then

		for nameserver in $new_domain_name_servers; do

			echo "nameserver $nameserver" >>/var/etc/resolv.conf.std

			echo $nameserver >>/var/etc/nameservers.conf

			echo $new_domain_name >/var/etc/defaultdomain.conf

		done

	fi

	if [ -f /var/etc/resolv.conf.std ]; then

		if [ -f /var/etc/resolv.conf.tail ]; then

			cat /var/etc/resolv.conf.tail >>/var/etc/resolv.conf.std

		fi

		# In case (e.g. during OpenBSD installs) /var/etc/resolv.conf

		# is a symbolic link, take care to preserve the link and write

		# the new data in the correct location.

		if [ -f /var/etc/resolv.conf ]; then

			cat /var/etc/resolv.conf > /var/etc/resolv.conf.save

		fi

		cat /var/etc/resolv.conf.std > /var/etc/nameservers.conf

		cat /var/etc/resolv.conf.std > /var/etc/resolv.conf

		rm -f /var/etc/resolv.conf.std

		# Try to ensure correct ownership and permissions.

		chown -RL root:wheel /var/etc/resolv.conf

		chmod -RL 644 /var/etc/resolv.conf

		return 0

	fi

	return 1

}

# Must be used on exit.   Invokes the local dhcp client exit hooks, if any.

exit_with_hooks() {

	exit_status=$1

	if [ -f /etc/dhclient-exit-hooks ]; then

		. /etc/dhclient-exit-hooks

	fi

	# probably should do something with exit status of the local script

	exit $exit_status

}

#

# Start of active code.

#

# Invoke the local dhcp client enter hooks, if they exist.

if [ -f /etc/dhclient-enter-hooks ]; then

	exit_status=0

	. /etc/dhclient-enter-hooks

	# allow the local script to abort processing of this state

	# local script must set exit_status variable to nonzero.

	if [ $exit_status -ne 0 ]; then

		exit $exit_status

	fi

fi

if [ -x $NETSTAT ]; then

	if_defaulroute=`$NETSTAT -rn | $GREP "^default" | $AWK '{print $6}'`

else

	if_defaultroute="x"

fi

case $reason in

MEDIUM)

	ifconfig $interface $medium

	ifconfig $interface inet -alias 0.0.0.0 $medium >/dev/null 2>&1

	sleep 1

	;;

PREINIT)

	delete_old_alias

	ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up

        rm -f /tmp/${interface}_router

	;;

ARPCHECK|ARPSEND)

	;;

BOUND|RENEW|REBIND|REBOOT)

	check_hostname

	if [ -n "$old_ip_address" ]; then

		if [ "$old_ip_address" != "$alias_ip_address" ]; then

			delete_old_alias

		fi

		if [ "$old_ip_address" != "$new_ip_address" ]; then

			delete_old_address

			delete_old_routes

		fi

	fi

	if [ "$reason" = BOUND ] || \

	   [ "$reason" = REBOOT ] || \

	   [ -z "$old_ip_address" ] || \

	   [ "$old_ip_address" != "$new_ip_address" ]; then

		add_new_address

		add_new_routes

	fi

	if [ "$new_ip_address" != "$alias_ip_address" ]; then

		add_new_alias

	fi

	add_new_resolv_conf

	;;

EXPIRE|FAIL)

	delete_old_alias

	if [ -n "$old_ip_address" ]; then

		delete_old_address

		delete_old_routes

	fi

	# XXX Why add alias we just deleted above?

	add_new_alias

	if [ -f /var/etc/resolv.conf.save ]; then

		cat /var/etc/resolv.conf.save > /var/etc/resolv.conf

	fi

	;;

TIMEOUT)

	delete_old_alias

	add_new_address

	sleep 1

	if [ -n "$new_routers" ]; then

		$LOGGER "New Routers ($interface): $new_routers"

		set "$new_routers"

		if ping -q -c 1 -w 1 "$1"; then

			if [ "$new_ip_address" != "$alias_ip_address" ]; then

				add_new_alias

			fi

			add_new_routes

			if add_new_resolv_conf; then

				exit_with_hooks 0

			fi

		fi

	fi

	ifconfig $interface inet -alias $new_ip_address $medium

	delete_old_routes

	exit_with_hooks 1

	;;

esac

exit_with_hooks 0