sbin/dhclient/dhclient-script

   1 #!/bin/sh
   2 #
   3 # $OpenBSD: src/sbin/dhclient/dhclient-script,v 1.22 2011/04/09 19:53:00 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 }
  31
  32 add_new_address() {
  33         ifconfig $interface \
  34                 inet $new_ip_address \
  35                 netmask $new_subnet_mask \
  36                 broadcast $new_broadcast_address
  37
  38         # XXX Original TIMEOUT code did not do this unless $new_routers was set?
  39         #route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
  40 }
  41
  42 delete_old_routes() {
  43         arp -dan
  44 }
  45
  46 add_new_routes() {
  47         for router in $new_routers; do
  48                 route -q delete default
  49                 if [ "$new_ip_address" = "$router" ]; then
  50                         route -q add default -iface $router
  51                 else
  52                         route -q add default $router
  53                 fi
  54                 # 2nd and subsequent default routers error out, so explicitly
  55                 # stop processing the list after the first one.
  56                 break
  57         done
  58 }
  59
  60 add_new_resolv_conf() {
  61         # Create resolv.conf when either $new_domain_name_servers or
  62         # $new_domain_name are provided. As reported in PR#3135, some ISPs
  63         # provide only $new_domain_name_servers.
  64
  65         rm -f /etc/resolv.conf.std
  66
  67         if [ -n "$new_domain_name" ]; then
  68                 echo "search $new_domain_name" >>/etc/resolv.conf.std
  69         fi
  70
  71         if [ -n "$new_domain_name_servers" ]; then
  72                 for nameserver in $new_domain_name_servers; do
  73                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
  74                 done
  75         fi
  76
  77         if [ -f /etc/resolv.conf.std ]; then
  78                 if [ -f /etc/resolv.conf.tail ]; then
  79                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
  80                 fi
  81
  82                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
  83                 # is a symbolic link, take care to preserve the link and write
  84                 # the new data in the correct location.
  85
  86                 if [ -f /etc/resolv.conf ]; then
  87                         cat /etc/resolv.conf > /etc/resolv.conf.save
  88                 fi
  89                 cat /etc/resolv.conf.std > /etc/resolv.conf
  90                 rm -f /etc/resolv.conf.std
  91
  92                 # Try to ensure correct ownership and permissions.
  93                 chown -RL root:wheel /etc/resolv.conf
  94                 chmod -RL 644 /etc/resolv.conf
  95
  96                 return 0
  97         fi
  98
  99         return 1
 100 }
 101
 102 #
 103 # Start of active code.
 104 #
 105
 106 case $reason in
 107 MEDIUM)
 108         # Not called by OpenBSD dhclient(8).
 109         ;;
 110
 111 PREINIT)
 112         # Not called by OpenBSD dhclient(8).
 113         ;;
 114
 115 ARPSEND)
 116         # Not called by OpenBSD dhclient(8).
 117         exit 1
 118         ;;
 119
 120 ARPCHECK)
 121         # Not called by OpenBSD dhclient(8).
 122         # Always succeed. i.e. accept lease.
 123         ;;
 124
 125 BOUND|RENEW|REBIND|REBOOT)
 126         if [ -n "$old_ip_address" ]; then
 127                 if [ "$old_ip_address" != "$new_ip_address" ]; then
 128                         delete_old_address
 129                         delete_old_routes
 130                 fi
 131         fi
 132         if [ "$reason" = BOUND ] ||
 133            [ "$reason" = REBOOT ] ||
 134            [ -z "$old_ip_address" ] ||
 135            [ "$old_ip_address" != "$new_ip_address" ]; then
 136                 add_new_address
 137                 add_new_routes
 138         fi
 139         add_new_resolv_conf
 140         ;;
 141
 142 EXPIRE|FAIL)
 143         if [ -n "$old_ip_address" ]; then
 144                 delete_old_address
 145                 delete_old_routes
 146         fi
 147         if [ -f /etc/resolv.conf.save ]; then
 148                 cat /etc/resolv.conf.save > /etc/resolv.conf
 149         fi
 150         ;;
 151
 152 TIMEOUT)
 153         add_new_address
 154         sleep 1
 155         if [ -n "$new_routers" ]; then
 156                 set "$new_routers"
 157                 if ping -q -c 1 -w 1 "$1"; then
 158                         add_new_routes
 159                         if add_new_resolv_conf; then
 160                                 exit 0
 161                         fi
 162                 fi
 163         fi
 164         ifconfig $interface inet $new_ip_address delete
 165         # XXX Why not a delete_old_address as before all other invocations of
 166         #     delete_old_routes?
 167         delete_old_routes
 168         exit 1
 169         ;;
 170 esac
 171
 172 exit 0