#!/bin/sh # # $OpenBSD: src/sbin/dhclient/Attic/dhclient-script,v 1.23 2012/09/18 18:27:55 krw 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 $old_ip_address delete #route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1 fi if [ -n "$old_classless_routes" ]; then fill_classless_routes "$old_classless_routes" set $classless_routes while [ $# -gt 1 ]; do route delete "$1" "$2" shift; shift done return 0; fi } add_new_address() { ifconfig $interface \ inet $new_ip_address \ netmask $new_subnet_mask \ broadcast $new_broadcast_address # 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 } fill_classless_routes() { set $1 while [ $# -ge 5 ]; do if [ $1 -eq 0 ]; then route="default" elif [ $1 -le 8 ]; then route="$2.0.0.0/$1" shift elif [ $1 -le 16 ]; then route="$2.$3.0.0/$1" shift; shift elif [ $1 -le 24 ]; then route="$2.$3.$4.0/$1" shift; shift; shift else route="$2.$3.$4.$5/$1" shift; shift; shift; shift fi shift router="$1.$2.$3.$4" classless_routes="$classless_routes $route $router" shift; shift; shift; shift done } delete_old_routes() { arp -d -i $interface -an } add_new_routes() { # RFC 3442: If the DHCP server returns both a Classless Static # Routes option and a Router option, the DHCP client MUST ignore # the Router option. # # DHCP clients that support this option (Classless Static Routes) # MUST NOT install the routes specified in the Static Routes # option (option code 33) if both a Static Routes option and the # Classless Static Routes option are provided. if [ -n "$new_classless_routes" ]; then fill_classless_routes "$new_classless_routes" $LOGGER "New Classless Static Routes ($interface): $classless_routes" set $classless_routes while [ $# -gt 1 ]; do if [ "0.0.0.0" = "$2" ]; then route add "$1" -iface "$interface" else route add "$1" "$2" fi shift; shift done return fi for router in $new_routers; do route -q delete default if [ "$new_ip_address" = "$router" ]; then route -q add default -iface $router else route -q add default $router fi # 2nd and subsequent default routers error out, so explicitly # stop processing the list after the first one. break done } add_new_resolv_conf() { # Create resolv.conf when either $new_domain_name_servers or # $new_domain_name are provided. As reported in PR#3135, some ISPs # provide only $new_domain_name_servers. local tmpres="/var/run/dhclient-resolv.conf.$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 "$tmpres" ]; then /sbin/resolvconf -a "$interface.dhcp" <"$tmpres" rm -f "$tmpres" else /sbin/resolvconf -d "$interface.dhcp" -f fi return 0 } # # Start of active code. # case $reason in MEDIUM) # Not called by OpenBSD dhclient(8). ;; PREINIT) # Not called by OpenBSD dhclient(8). ;; ARPSEND) # Not called by OpenBSD dhclient(8). exit 1 ;; ARPCHECK) # Not called by OpenBSD dhclient(8). # Always succeed. i.e. accept lease. ;; BOUND|RENEW|REBIND|REBOOT) if [ -n "$old_ip_address" ]; then 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" != "$new_ip_address" ]; then add_new_address add_new_routes fi add_new_resolv_conf ;; EXPIRE|FAIL) if [ -n "$old_ip_address" ]; then delete_old_address delete_old_routes fi /sbin/resolvconf -d "$interface.dhcp" -f ;; TIMEOUT) add_new_address sleep 1 if [ -n "$new_routers" ]; then set "$new_routers" if ping -q -c 1 -w 1 "$1"; then add_new_routes if add_new_resolv_conf; then exit 0 fi fi fi ifconfig $interface inet $new_ip_address delete # XXX Why not a delete_old_address as before all other invocations of # delete_old_routes? delete_old_routes exit 1 ;; esac exit 0