sbin/dhclient/dhclient-script

   1 #!/bin/sh
   2 #
   3 # $OpenBSD: src/sbin/dhclient/dhclient-script,v 1.18 2011/03/27 12:15:46 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 $medium
  28                 #route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1
  29         fi
  30 }
  31
  32 add_new_address() {
  33         ifconfig $interface \
  34                 inet $new_ip_address \
  35                 netmask $new_subnet_mask \
  36                 broadcast $new_broadcast_address \
  37                 $medium
  38
  39         # XXX Original TIMEOUT code did not do this unless $new_routers was set?
  40         #route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
  41 }
  42
  43 delete_old_alias() {
  44         if [ -n "$alias_ip_address" ]; then
  45                 ifconfig $interface inet $alias_ip_address delete > /dev/null 2>&1
  46 #               #route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
  47         fi
  48 }
  49
  50 add_new_alias() {
  51         if [ -n "$alias_ip_address" ]; then
  52                 ifconfig $interface inet $alias_ip_address alias netmask \
  53                     $alias_subnet_mask
  54                 #route add $alias_ip_address 127.0.0.1
  55         fi
  56 }
  57
  58 delete_old_routes() {
  59         if [ -n "$old_static_routes" ]; then
  60                 set $old_static_routes
  61                 while [ $# -gt 1 ]; do
  62                         route delete "$1" "$2"
  63                         shift; shift
  64                 done
  65         fi
  66
  67         arp -dan
  68 }
  69
  70 add_new_routes() {
  71         for router in $new_routers; do
  72                 route -q delete default
  73                 if [ "$new_ip_address" = "$router" ]; then
  74                         route -q add default -iface $router
  75                 else
  76                         route -q add default $router
  77                 fi
  78                 # 2nd and subsequent default routers error out, so explicitly
  79                 # stop processing the list after the first one.
  80                 break
  81         done
  82
  83         if [ -n "$new_static_routes" ]; then
  84                 set $new_static_routes
  85                 while [ $# -gt 1 ]; do
  86                         route add $1 $2
  87                         shift; shift
  88                 done
  89         fi
  90 }
  91
  92 add_new_resolv_conf() {
  93         # Create resolv.conf when either $new_domain_name_servers or
  94         # $new_domain_name are provided. As reported in PR#3135, some ISPs
  95         # provide only $new_domain_name_servers.
  96
  97         rm -f /etc/resolv.conf.std
  98
  99         if [ -n "$new_domain_name" ]; then
 100                 echo "search $new_domain_name" >>/etc/resolv.conf.std
 101         fi
 102
 103         if [ -n "$new_domain_name_servers" ]; then
 104                 for nameserver in $new_domain_name_servers; do
 105                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
 106                 done
 107         fi
 108
 109         if [ -f /etc/resolv.conf.std ]; then
 110                 if [ -f /etc/resolv.conf.tail ]; then
 111                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
 112                 fi
 113
 114                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
 115                 # is a symbolic link, take care to preserve the link and write
 116                 # the new data in the correct location.
 117
 118                 if [ -f /etc/resolv.conf ]; then
 119                         cat /etc/resolv.conf > /etc/resolv.conf.save
 120                 fi
 121                 cat /etc/resolv.conf.std > /etc/resolv.conf
 122                 rm -f /etc/resolv.conf.std
 123
 124                 # Try to ensure correct ownership and permissions.
 125                 chown -RL root:wheel /etc/resolv.conf
 126                 chmod -RL 644 /etc/resolv.conf
 127
 128                 return 0
 129         fi
 130
 131         return 1
 132 }
 133
 134 #
 135 # Start of active code.
 136 #
 137
 138 case $reason in
 139 MEDIUM)
 140         ifconfig $interface $medium
 141         sleep 1
 142         ;;
 143
 144 PREINIT)
 145         delete_old_alias
 146         ifconfig $interface up
 147         ;;
 148
 149 ARPCHECK)
 150         # Always succeed. i.e. accept lease.
 151         ;;
 152
 153 ARPSEND)
 154         # Always fail. i.e. don't wait for ARP packet here.
 155         exit 1
 156         ;;
 157
 158 BOUND|RENEW|REBIND|REBOOT)
 159         if [ -n "$old_ip_address" ]; then
 160                 if [ "$old_ip_address" != "$alias_ip_address" ]; then
 161                         delete_old_alias
 162                 fi
 163                 if [ "$old_ip_address" != "$new_ip_address" ]; then
 164                         delete_old_address
 165                         delete_old_routes
 166                 fi
 167         fi
 168         if [ "$reason" = BOUND ] ||
 169            [ "$reason" = REBOOT ] ||
 170            [ -z "$old_ip_address" ] ||
 171            [ "$old_ip_address" != "$new_ip_address" ]; then
 172                 add_new_address
 173                 add_new_routes
 174         fi
 175         if [ "$new_ip_address" != "$alias_ip_address" ]; then
 176                 add_new_alias
 177         fi
 178         add_new_resolv_conf
 179         ;;
 180
 181 EXPIRE|FAIL)
 182         delete_old_alias
 183         if [ -n "$old_ip_address" ]; then
 184                 delete_old_address
 185                 delete_old_routes
 186         fi
 187         # XXX Why add alias we just deleted above?
 188         add_new_alias
 189         if [ -f /etc/resolv.conf.save ]; then
 190                 cat /etc/resolv.conf.save > /etc/resolv.conf
 191         fi
 192         ;;
 193
 194 TIMEOUT)
 195         delete_old_alias
 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 "$1"; then
 201                         if [ "$new_ip_address" != "$alias_ip_address" ]; then
 202                                 add_new_alias
 203                         fi
 204                         add_new_routes
 205                         if add_new_resolv_conf; then
 206                                 exit 0
 207                         fi
 208                 fi
 209         fi
 210         ifconfig $interface inet $new_ip_address delete $medium
 211         # XXX Why not a delete_old_address as before all other invocations of
 212         #     delete_old_routes?
 213         delete_old_routes
 214         exit 1
 215         ;;
 216 esac
 217
 218 exit 0