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         if [ -n "$old_classless_routes" ]; then
  30                 fill_classless_routes "$old_classless_routes"
  31                 set $classless_routes
  32                 while [ $# -gt 1 ]; do
  33                         route delete "$1" "$2"
  34                         shift; shift
  35                 done
  36                 return 0;
  37         fi
  38 }
  39
  40 add_new_address() {
  41         ifconfig $interface \
  42                 inet $new_ip_address \
  43                 netmask $new_subnet_mask \
  44                 broadcast $new_broadcast_address
  45
  46         # XXX Original TIMEOUT code did not do this unless $new_routers was set?
  47         #route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
  48 }
  49
  50 fill_classless_routes() {
  51         set $1
  52         while [ $# -ge 5 ]; do
  53                 if [ $1 -eq 0 ]; then
  54                         route="default"
  55                 elif [ $1 -le 8 ]; then
  56                         route="$2.0.0.0/$1"
  57                         shift
  58                 elif [ $1 -le 16 ]; then
  59                         route="$2.$3.0.0/$1"
  60                         shift; shift
  61                 elif [ $1 -le 24 ]; then
  62                         route="$2.$3.$4.0/$1"
  63                         shift; shift; shift
  64                 else
  65                         route="$2.$3.$4.$5/$1"
  66                         shift; shift; shift; shift
  67                 fi
  68                 shift
  69                 router="$1.$2.$3.$4"
  70                 classless_routes="$classless_routes $route $router"
  71                 shift; shift; shift; shift
  72         done
  73 }
  74
  75 delete_old_routes() {
  76         arp -dan
  77 }
  78
  79 add_new_routes() {
  80         # RFC 3442: If the DHCP server returns both a Classless Static
  81         # Routes option and a Router option, the DHCP client MUST ignore
  82         # the Router option.
  83         #
  84         # DHCP clients that support this option (Classless Static Routes)
  85         # MUST NOT install the routes specified in the Static Routes
  86         # option (option code 33) if both a Static Routes option and the
  87         # Classless Static Routes option are provided.
  88
  89         if [ -n "$new_classless_routes" ]; then
  90                 fill_classless_routes "$new_classless_routes"
  91                 $LOGGER "New Classless Static Routes ($interface): $classless_routes"
  92                 set $classless_routes
  93                 while [ $# -gt 1 ]; do
  94                         if [ "0.0.0.0" = "$2" ]; then
  95                                 route add "$1" -iface "$interface"
  96                         else
  97                                 route add "$1" "$2"
  98                         fi
  99                         shift; shift
 100                 done
 101                 return
 102         fi
 103
 104         for router in $new_routers; do
 105                 route -q delete default
 106                 if [ "$new_ip_address" = "$router" ]; then
 107                         route -q add default -iface $router
 108                 else
 109                         route -q add default $router
 110                 fi
 111                 # 2nd and subsequent default routers error out, so explicitly
 112                 # stop processing the list after the first one.
 113                 break
 114         done
 115 }
 116
 117 add_new_resolv_conf() {
 118         # Create resolv.conf when either $new_domain_name_servers or
 119         # $new_domain_name are provided. As reported in PR#3135, some ISPs
 120         # provide only $new_domain_name_servers.
 121
 122         rm -f /etc/resolv.conf.std
 123
 124         if [ -n "$new_domain_name" ]; then
 125                 echo "search $new_domain_name" >>/etc/resolv.conf.std
 126         fi
 127
 128         if [ -n "$new_domain_name_servers" ]; then
 129                 for nameserver in $new_domain_name_servers; do
 130                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
 131                 done
 132         fi
 133
 134         if [ -f /etc/resolv.conf.std ]; then
 135                 if [ -f /etc/resolv.conf.tail ]; then
 136                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
 137                 fi
 138
 139                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
 140                 # is a symbolic link, take care to preserve the link and write
 141                 # the new data in the correct location.
 142
 143                 if [ -f /etc/resolv.conf ]; then
 144                         cat /etc/resolv.conf > /etc/resolv.conf.save
 145                 fi
 146                 cat /etc/resolv.conf.std > /etc/resolv.conf
 147                 rm -f /etc/resolv.conf.std
 148
 149                 # Try to ensure correct ownership and permissions.
 150                 chown -RL root:wheel /etc/resolv.conf
 151                 chmod -RL 644 /etc/resolv.conf
 152
 153                 return 0
 154         fi
 155
 156         return 1
 157 }
 158
 159 #
 160 # Start of active code.
 161 #
 162
 163 case $reason in
 164 MEDIUM)
 165         # Not called by OpenBSD dhclient(8).
 166         ;;
 167
 168 PREINIT)
 169         # Not called by OpenBSD dhclient(8).
 170         ;;
 171
 172 ARPSEND)
 173         # Not called by OpenBSD dhclient(8).
 174         exit 1
 175         ;;
 176
 177 ARPCHECK)
 178         # Not called by OpenBSD dhclient(8).
 179         # Always succeed. i.e. accept lease.
 180         ;;
 181
 182 BOUND|RENEW|REBIND|REBOOT)
 183         if [ -n "$old_ip_address" ]; then
 184                 if [ "$old_ip_address" != "$new_ip_address" ]; then
 185                         delete_old_address
 186                         delete_old_routes
 187                 fi
 188         fi
 189         if [ "$reason" = BOUND ] ||
 190            [ "$reason" = REBOOT ] ||
 191            [ -z "$old_ip_address" ] ||
 192            [ "$old_ip_address" != "$new_ip_address" ]; then
 193                 add_new_address
 194                 add_new_routes
 195         fi
 196         add_new_resolv_conf
 197         ;;
 198
 199 EXPIRE|FAIL)
 200         if [ -n "$old_ip_address" ]; then
 201                 delete_old_address
 202                 delete_old_routes
 203         fi
 204         if [ -f /etc/resolv.conf.save ]; then
 205                 cat /etc/resolv.conf.save > /etc/resolv.conf
 206                 rm -f /etc/resolv.conf.save
 207         fi
 208         ;;
 209
 210 TIMEOUT)
 211         add_new_address
 212         sleep 1
 213         if [ -n "$new_routers" ]; then
 214                 set "$new_routers"
 215                 if ping -q -c 1 -w 1 "$1"; then
 216                         add_new_routes
 217                         if add_new_resolv_conf; then
 218                                 exit 0
 219                         fi
 220                 fi
 221         fi
 222         ifconfig $interface inet $new_ip_address delete
 223         # XXX Why not a delete_old_address as before all other invocations of
 224         #     delete_old_routes?
 225         delete_old_routes
 226         exit 1
 227         ;;
 228 esac
 229
 230 exit 0