1#!/bin/sh 2# 3# $OpenBSD: src/sbin/dhclient/Attic/dhclient-script,v 1.23 2012/09/18 18:27:55 krw Exp $ 4# 5# Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org> 6# 7# Permission to use, copy, modify, and distribute this software for any 8# purpose with or without fee is hereby granted, provided that the above 9# copyright notice and this permission notice appear in all copies. 10# 11# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18# 19# 20 21# 22# Helper functions that implement common actions. 23# 24 25delete_old_address() { 26 if [ -n "$old_ip_address" ]; then 27 ifconfig $interface inet $old_ip_address delete 28 #route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1 29 fi 30 if [ -n "$old_classless_routes" ]; then 31 fill_classless_routes "$old_classless_routes" 32 set $classless_routes 33 while [ $# -gt 1 ]; do 34 route delete "$1" "$2" 35 shift; shift 36 done 37 return 0; 38 fi 39} 40 41add_new_address() { 42 ifconfig $interface \ 43 inet $new_ip_address \ 44 netmask $new_subnet_mask \ 45 broadcast $new_broadcast_address 46 47 # XXX Original TIMEOUT code did not do this unless $new_routers was set? 48 #route add $new_ip_address 127.0.0.1 >/dev/null 2>&1 49} 50 51fill_classless_routes() { 52 set $1 53 while [ $# -ge 5 ]; do 54 if [ $1 -eq 0 ]; then 55 route="default" 56 elif [ $1 -le 8 ]; then 57 route="$2.0.0.0/$1" 58 shift 59 elif [ $1 -le 16 ]; then 60 route="$2.$3.0.0/$1" 61 shift; shift 62 elif [ $1 -le 24 ]; then 63 route="$2.$3.$4.0/$1" 64 shift; shift; shift 65 else 66 route="$2.$3.$4.$5/$1" 67 shift; shift; shift; shift 68 fi 69 shift 70 router="$1.$2.$3.$4" 71 classless_routes="$classless_routes $route $router" 72 shift; shift; shift; shift 73 done 74} 75 76delete_old_routes() { 77 arp -d -i $interface -an 78} 79 80add_new_routes() { 81 # RFC 3442: If the DHCP server returns both a Classless Static 82 # Routes option and a Router option, the DHCP client MUST ignore 83 # the Router option. 84 # 85 # DHCP clients that support this option (Classless Static Routes) 86 # MUST NOT install the routes specified in the Static Routes 87 # option (option code 33) if both a Static Routes option and the 88 # Classless Static Routes option are provided. 89 90 if [ -n "$new_classless_routes" ]; then 91 fill_classless_routes "$new_classless_routes" 92 $LOGGER "New Classless Static Routes ($interface): $classless_routes" 93 set $classless_routes 94 while [ $# -gt 1 ]; do 95 if [ "0.0.0.0" = "$2" ]; then 96 route add "$1" -iface "$interface" 97 else 98 route add "$1" "$2" 99 fi 100 shift; shift 101 done 102 return 103 fi 104 105 for router in $new_routers; do 106 route -q delete default 107 if [ "$new_ip_address" = "$router" ]; then 108 route -q add default -iface $router 109 else 110 route -q add default $router 111 fi 112 # 2nd and subsequent default routers error out, so explicitly 113 # stop processing the list after the first one. 114 break 115 done 116} 117 118add_new_resolv_conf() { 119 # Create resolv.conf when either $new_domain_name_servers or 120 # $new_domain_name are provided. As reported in PR#3135, some ISPs 121 # provide only $new_domain_name_servers. 122 123 local tmpres="/var/run/dhclient-resolv.conf.$interface" 124 125 rm -f "$tmpres" 126 127 if [ -n "$new_domain_name" ]; then 128 echo "search $new_domain_name" >>"$tmpres" 129 fi 130 131 if [ -n "$new_domain_name_servers" ]; then 132 for nameserver in $new_domain_name_servers; do 133 echo "nameserver $nameserver" >>"$tmpres" 134 done 135 fi 136 137 if [ -f "$tmpres" ]; then 138 /sbin/resolvconf -a "$interface.dhcp" <"$tmpres" 139 rm -f "$tmpres" 140 else 141 /sbin/resolvconf -d "$interface.dhcp" -f 142 fi 143 144 return 0 145} 146 147# 148# Start of active code. 149# 150 151case $reason in 152MEDIUM) 153 # Not called by OpenBSD dhclient(8). 154 ;; 155 156PREINIT) 157 # Not called by OpenBSD dhclient(8). 158 ;; 159 160ARPSEND) 161 # Not called by OpenBSD dhclient(8). 162 exit 1 163 ;; 164 165ARPCHECK) 166 # Not called by OpenBSD dhclient(8). 167 # Always succeed. i.e. accept lease. 168 ;; 169 170BOUND|RENEW|REBIND|REBOOT) 171 if [ -n "$old_ip_address" ]; then 172 if [ "$old_ip_address" != "$new_ip_address" ]; then 173 delete_old_address 174 delete_old_routes 175 fi 176 fi 177 if [ "$reason" = BOUND ] || 178 [ "$reason" = REBOOT ] || 179 [ -z "$old_ip_address" ] || 180 [ "$old_ip_address" != "$new_ip_address" ]; then 181 add_new_address 182 add_new_routes 183 fi 184 add_new_resolv_conf 185 ;; 186 187EXPIRE|FAIL) 188 if [ -n "$old_ip_address" ]; then 189 delete_old_address 190 delete_old_routes 191 fi 192 /sbin/resolvconf -d "$interface.dhcp" -f 193 ;; 194 195TIMEOUT) 196 add_new_address 197 sleep 1 198 if [ -n "$new_routers" ]; then 199 set "$new_routers" 200 if ping -q -c 1 -w 1 "$1"; then 201 add_new_routes 202 if add_new_resolv_conf; then 203 exit 0 204 fi 205 fi 206 fi 207 ifconfig $interface inet $new_ip_address delete 208 # XXX Why not a delete_old_address as before all other invocations of 209 # delete_old_routes? 210 delete_old_routes 211 exit 1 212 ;; 213esac 214 215exit 0 216