#!/bin/sh # $Id$ # $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 # # 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 GREP=/usr/bin/grep ROUTE=/sbin/route SED=/usr/bin/sed ARP=/usr/sbin/arp IFCONFIG=/sbin/ifconfig 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' | \ /bin/sh >/dev/null 2>&1 } delete_old_address() { $IFCONFIG $interface inet -alias $old_ip_address $medium } add_new_address() { $LOGGER "Starting add_new_address()" $LOGGER "ifconfig $interface inet $new_ip_address netmask $new_subnet_mask broadcast $new_broadcast_address $medium" $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 cp /var/db/${interface}_ip /tmp/rc.newwanip_oldip 2>/dev/null # echo $new_ip_address > /var/db/${interface}_ip echo $interface > /tmp/rc.newwanip # echo $new_ip_address >> /tmp/rc.newwanip } delete_old_alias() { if [ -n "$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() { $LOGGER "Deleting old routes" $ROUTE delete "$old_ip_address" $LOCALHOST >/dev/null 2>&1 # Only allow the default route to be overridden if it's on our own interface DEFAULTROUTE_IFACE=`route get default | grep interface | awk '{print $2};'` if [ -z "${DEFAULTROUTE_IFACE}" -o "{$interface}" = "${DEFAULTROUTE_IFACE}" ]; then for router in $old_routers; do if [ $if_defaultroute = x -o $if_defaultroute = $interface ]; then $ROUTE delete default $route >/dev/null 2>&1 /bin/rm -f /tmp/${interface}_router fi done fi if [ -n "$old_static_routes" ]; then set $old_static_routes while [ $# -gt 1 ]; do $ROUTE delete "$1" "$2" shift; shift /bin/rm -f /tmp/${interface}_router done fi arp_flush } add_new_routes() { $LOGGER "Adding new routes" # $ROUTE add $new_ip_address $LOCALHOST >/dev/null 2>&1 # Only allow the default route to be overridden if it's on our own interface DEFAULTROUTE_IFACE=`route get default | grep interface | awk '{print $2};'` if [ -z "${DEFAULTROUTE_IFACE}" -o "{$interface}" = "${DEFAULTROUTE_IFACE}" ]; then for router in $new_routers; do if [ "$new_ip_address" = "$router" ]; then $ROUTE add default -iface $router #>/dev/null 2>&1 echo $ROUTE add default -iface $router | $LOGGER echo $new_routers > /tmp/${interface}_router else $ROUTE add default $router echo $ROUTE add default $router | $LOGGER #>/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 fi 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 # last ditch effort if no route exists. DEFAULTROUTE=`$NETSTAT -rn | $GREP default` if [ -z "${DEFAULTROUTE}" ]; then $ROUTE add default -iface $interface fi } add_new_resolv_conf() { $LOGGER "Creating resolv.conf" /bin/rm -f /var/etc/nameservers.conf if [ ! -f "/var/etc/nameserver_$interface" ]; then # Make sure file exists to avoid errors touch /var/etc/nameserver_$interface fi if [ -n "$new_domain_name_servers" ]; then # Remove old entries for nameserver in `cat /var/etc/nameserver_$interface`; do route delete $nameserver done rm -f /var/etc/nameserver_$interface for nameserver in $new_domain_name_servers; do echo $nameserver >>/var/etc/nameservers.conf # Add a route to the nameserver out the correct interface # so that mulitple wans work correctly with multiple dns # also backup the nameserver for later route removal echo $nameserver >>/var/etc/nameserver_$interface route add $nameserver -if $interface done echo $new_domain_name >/var/etc/defaultdomain.conf fi return 0 } # Notify rc.newwanip of changes to an interface notify_rc_newwanip() { } # # Start of active code. # # Invoke the local dhcp client enter hooks, if they exist. if [ -f /etc/dhclient-enter-hooks ]; then $LOGGER "dhclient-enter-hooks" 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 $LOGGER "netstat" if_defaultroute=`$NETSTAT -rn | $GREP "^default" | $AWK '{print $6}'` else $LOGGER "if_defaultroute" if_defaultroute="x" fi $LOGGER $reason case $reason in MEDIUM) $IFCONFIG $interface $medium $IFCONFIG $interface inet -alias 0.0.0.0 $medium >/dev/null 2>&1 /bin/sleep 1 ;; PREINIT) delete_old_alias $IFCONFIG $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up /bin/rm -f /tmp/${interface}_router ;; ARPCHECK|ARPSEND) ;; BOUND|RENEW|REBIND|REBOOT) check_hostname changes=no if [ -n "$old_ip_address" ]; then if [ -n "$alias_ip_address" ] && \ [ "$old_ip_address" != "$alias_ip_address" ]; then delete_old_alias changes=yes fi if [ "$old_ip_address" != "$new_ip_address" ]; then delete_old_address delete_old_routes changes=yes fi fi if [ "$reason" = BOUND ] || \ [ "$reason" = REBOOT ] || \ [ -z "$old_ip_address" ] || \ [ "$old_ip_address" != "$new_ip_address" ]; then add_new_address add_new_routes changes=yes fi if [ -n "$alias_ip_address" ] && \ [ "$new_ip_address" != "$alias_ip_address" ]; then add_new_alias changes=yes fi add_new_resolv_conf if [ "$changes" = "yes" ] ; then notify_rc_newwanip fi ;; EXPIRE|FAIL) delete_old_alias if [ -n "$old_ip_address" ]; then delete_old_address delete_old_routes fi ;; TIMEOUT) delete_old_alias add_new_address /bin/sleep 1 if [ -n "$new_routers" ]; then $LOGGER "New Routers ($interface): $new_routers" set "$new_routers" if /sbin/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 notify_rc_newwanip fi fi fi $IFCONFIG $interface inet -alias $new_ip_address $medium delete_old_routes ;; esac # Invoke the local dhcp client exit hooks, if they exist. if [ -f /etc/dhclient-exit-hooks ]; then $LOGGER "dhclient-exit-hooks" exit_status=0 . /etc/dhclient-exit-hooks # allow the local script to abort processing of this state # local script must set exit_status variable to nonzero. exit $exit_status fi