#!/bin/sh # # $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio 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. # # # # Helper functions that implement common actions. # delete_old_address() { if [ -n "$old_ip_address" ]; then ifconfig $interface inet -alias $old_ip_address $medium route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1 fi } add_new_address() { ifconfig $interface \ inet $new_ip_address \ netmask $new_subnet_mask \ broadcast $new_broadcast_address \ $medium # XXX Original TIMEOUT code did not do this unless $new_routers was set? route add $new_ip_address 127.0.0.1 >/dev/null 2>&1 } delete_old_alias() { if [ -n "$alias_ip_address" ]; then ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1 fi } add_new_alias() { if [ -n "$alias_ip_address" ]; then ifconfig $interface inet alias $alias_ip_address netmask \ $alias_subnet_mask route add $alias_ip_address 127.0.0.1 fi } delete_old_routes() { # Delete existing default route. We only allow one, so no need to # process $old_routers list. route delete default >/dev/null 2>&1 if [ -n "$old_static_routes" ]; then set $old_static_routes while [ $# -gt 1 ]; do route delete "$1" "$2" shift; shift done fi arp -dan } add_new_routes() { route delete default >/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 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 $new_domain_name_servers and # thus broke the script. This code creates the resolv.conf if either # are provided. rm -f /etc/resolv.conf.std if [ -n "$new_domain_name" ]; then echo "search $new_domain_name" >>/etc/resolv.conf.std fi if [ -n "$new_domain_name_servers" ]; then for nameserver in $new_domain_name_servers; do echo "nameserver $nameserver" >>/etc/resolv.conf.std done fi if [ -f /etc/resolv.conf.std ]; then if [ -f /etc/resolv.conf.tail ]; then cat /etc/resolv.conf.tail >>/etc/resolv.conf.std fi # In case (e.g. during OpenBSD installs) /etc/resolv.conf # is a symbolic link, take care to preserve the link and write # the new data in the correct location. if [ -f /etc/resolv.conf ]; then cat /etc/resolv.conf > /etc/resolv.conf.save fi cat /etc/resolv.conf.std > /etc/resolv.conf rm -f /etc/resolv.conf.std # Try to ensure correct ownership and permissions. chown -RL root:wheel /etc/resolv.conf chmod -RL 644 /etc/resolv.conf return 0 fi return 1 } # # Start of active code. # if [ -n "$new_network_number" ]; then echo "New Network Number: $new_network_number" fi if [ -n "$new_broadcast_address" ]; then echo "New Broadcast Address: $new_broadcast_address" 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 $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up ;; ARPCHECK|ARPSEND) ;; BOUND|RENEW|REBIND|REBOOT) if [ -n "$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 /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 "$new_routers" ]; then set "$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 0 fi fi fi ifconfig $interface inet -alias $new_ip_address $medium # XXX Why not a delete_old_address as before all other invocations of # delete_old_routes? delete_old_routes exit 1 ;; esac exit 0