sbin/dhclient/dhclient-script

   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
  25 delete_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
  41 add_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
  51 fill_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 $router"
  72                 shift; shift; shift; shift
  73         done
  74 }
  75
  76 delete_old_routes() {
  77         arp -dan
  78 }
  79
  80 add_new_routes() {
  81         # RFC 3442: If the DHCP server returns both a Classless Static
  82         # Routes option and a Router option, the DHCP client MUST ignore
  83         # the Router option.
  84         #
  85         # DHCP clients that support this option (Classless Static Routes)
  86         # MUST NOT install the routes specified in the Static Routes
  87         # option (option code 33) if both a Static Routes option and the
  88         # Classless Static Routes option are provided.
  89
  90         if [ -n "$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
 118 add_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
 151 case $reason in
 152 MEDIUM)
 153         # Not called by OpenBSD dhclient(8).
 154         ;;
 155
 156 PREINIT)
 157         # Not called by OpenBSD dhclient(8).
 158         ;;
 159
 160 ARPSEND)
 161         # Not called by OpenBSD dhclient(8).
 162         exit 1
 163         ;;
 164
 165 ARPCHECK)
 166         # Not called by OpenBSD dhclient(8).
 167         # Always succeed. i.e. accept lease.
 168         ;;
 169
 170 BOUND|RENEW|REBIND|REBOOT)
 171         if [ -n "$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" != "$new_ip_address" ]; then
 181                 add_new_address
 182                 add_new_routes
 183         fi
 184         add_new_resolv_conf
 185         ;;
 186
 187 EXPIRE|FAIL)
 188         if [ -n "$old_ip_address" ]; then
 189                 delete_old_address
 190                 delete_old_routes
 191         fi
 192         /sbin/resolvconf -d "$interface.dhcp" -f
 193         ;;
 194
 195 TIMEOUT)
 196         add_new_address
 197         sleep 1
 198         if [ -n "$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         ;;
 213 esac
 214
 215 exit 0