#!/bin/sh # # $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $ # $FreeBSD$ # # 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. # # ARP=/usr/sbin/arp AWK=/usr/bin/awk HOSTNAME=/bin/hostname NETSTAT=/usr/bin/netstat 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() { eval "ifconfig $interface inet -alias $old_ip_address $medium" } add_new_address() { eval "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): $new_routers" } delete_old_alias() { if [ -n "$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 $route >/dev/null 2>&1 fi done if [ -n "$old_static_routes" ]; then set $old_static_routes while [ $# -gt 1 ]; do route delete "$1" "$2" shift; shift 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 $router >/dev/null 2>&1 fi # 2nd and subsequent default routers error out, so explicitly # stop processing the list after the first one. break done if [ -n "$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 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 $new_domain_name_servers and # thus broke the script. This code creates the resolv.conf if either # are provided. local tmpres=/var/run/resolv.conf.${interface} rm -f $tmpres if [ -n "$new_domain_name" ]; then echo "search $new_domain_name" >>$tmpres fi if [ -n "$new_domain_name_servers" ]; then for nameserver in $new_domain_name_servers; do echo "nameserver $nameserver" >>$tmpres done fi if [ -f $tmpres ]; then if [ -f /etc/resolv.conf.tail ]; then cat /etc/resolv.conf.tail >>$tmpres fi # When resolv.conf is not changed actually, we don't # need to update it. # If /usr is not mounted yet, we cannot use cmp, then # the following test fails. In such case, we simply # ignore an error and do update resolv.conf. if cmp -s $tmpres /etc/resolv.conf; then rm -f $tmpres return 0 fi 2>/dev/null # In case (e.g. during OpenBSD installs) /etc/resolv.conf # is a symbolic link, take care to preserve the link and write # the new data in the correct location. if [ -f /etc/resolv.conf ]; then cat /etc/resolv.conf > /etc/resolv.conf.save fi cat $tmpres > /etc/resolv.conf rm -f $tmpres # Try to ensure correct ownership and permissions. chown -RL root:wheel /etc/resolv.conf chmod -RL 644 /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 $NETSTAT ]; then if_defaultroute=`$NETSTAT -rnf inet | $AWK '{if ($1=="default") printf $6}'` else if_defaultroute="x" fi case $reason in MEDIUM) eval "ifconfig $interface $medium" eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1 sleep 1 ;; PREINIT) delete_old_alias ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up ;; ARPCHECK|ARPSEND) ;; BOUND|RENEW|REBIND|REBOOT) check_hostname if [ -n "$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 if [ -x $ARP ]; then $ARP -d -a -i $interface fi # XXX Why add alias we just deleted above? add_new_alias if [ -f /etc/resolv.conf.save ]; then cat /etc/resolv.conf.save > /etc/resolv.conf fi ;; TIMEOUT) delete_old_alias add_new_address sleep 1 if [ -n "$new_routers" ]; then $LOGGER "New Routers ($interface): $new_routers" set "$new_routers" if ping -q -c 1 -t 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 eval "ifconfig $interface inet -alias $new_ip_address $medium" delete_old_routes exit_with_hooks 1 ;; esac exit_with_hooks 0