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 $new_domain_name_servers.
 122
 123         rm -f /etc/resolv.conf.std
 124
 125         if [ -n "$new_domain_name" ]; then
 126                 echo "search $new_domain_name" >>/etc/resolv.conf.std
 127         fi
 128
 129         if [ -n "$new_domain_name_servers" ]; then
 130                 for nameserver in $new_domain_name_servers; do
 131                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
 132                 done
 133         fi
 134
 135         if [ -f /etc/resolv.conf.std ]; then
 136                 if [ -f /etc/resolv.conf.tail ]; then
 137                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
 138                 fi
 139
 140                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
 141                 # is a symbolic link, take care to preserve the link and write
 142                 # the new data in the correct location.
 143
 144                 if [ -f /etc/resolv.conf ]; then
 145                         cat /etc/resolv.conf > /etc/resolv.conf.save
 146                 fi
 147                 cat /etc/resolv.conf.std > /etc/resolv.conf
 148                 rm -f /etc/resolv.conf.std
 149
 150                 # Try to ensure correct ownership and permissions.
 151                 chown -RL root:wheel /etc/resolv.conf
 152                 chmod -RL 644 /etc/resolv.conf
 153
 154                 return 0
 155         fi
 156
 157         return 1
 158 }
 159
 160 #
 161 # Start of active code.
 162 #
 163
 164 case $reason in
 165 MEDIUM)
 166         # Not called by OpenBSD dhclient(8).
 167         ;;
 168
 169 PREINIT)
 170         # Not called by OpenBSD dhclient(8).
 171         ;;
 172
 173 ARPSEND)
 174         # Not called by OpenBSD dhclient(8).
 175         exit 1
 176         ;;
 177
 178 ARPCHECK)
 179         # Not called by OpenBSD dhclient(8).
 180         # Always succeed. i.e. accept lease.
 181         ;;
 182
 183 BOUND|RENEW|REBIND|REBOOT)
 184         if [ -n "$old_ip_address" ]; then
 185                 if [ "$old_ip_address" != "$new_ip_address" ]; then
 186                         delete_old_address
 187                         delete_old_routes
 188                 fi
 189         fi
 190         if [ "$reason" = BOUND ] ||
 191            [ "$reason" = REBOOT ] ||
 192            [ -z "$old_ip_address" ] ||
 193            [ "$old_ip_address" != "$new_ip_address" ]; then
 194                 add_new_address
 195                 add_new_routes
 196         fi
 197         add_new_resolv_conf
 198         ;;
 199
 200 EXPIRE|FAIL)
 201         if [ -n "$old_ip_address" ]; then
 202                 delete_old_address
 203                 delete_old_routes
 204         fi
 205         if [ -f /etc/resolv.conf.save ]; then
 206                 cat /etc/resolv.conf.save > /etc/resolv.conf
 207                 rm -f /etc/resolv.conf.save
 208         fi
 209         ;;
 210
 211 TIMEOUT)
 212         add_new_address
 213         sleep 1
 214         if [ -n "$new_routers" ]; then
 215                 set "$new_routers"
 216                 if ping -q -c 1 -w 1 "$1"; then
 217                         add_new_routes
 218                         if add_new_resolv_conf; then
 219                                 exit 0
 220                         fi
 221                 fi
 222         fi
 223         ifconfig $interface inet $new_ip_address delete
 224         # XXX Why not a delete_old_address as before all other invocations of
 225         #     delete_old_routes?
 226         delete_old_routes
 227         exit 1
 228         ;;
 229 esac
 230
 231 exit 0