sbin/dhclient/dhclient-script

   1 #!/bin/sh
   2 #
   3 # $OpenBSD: dhclient-script,v 1.12 2007/08/11 17:58:55 krw Exp $
   4 # $DragonFly: src/sbin/dhclient/dhclient-script,v 1.1 2008/08/30 16:07:58 hasso Exp $
   5 #
   6 # Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org>
   7 #
   8 # Permission to use, copy, modify, and distribute this software for any
   9 # purpose with or without fee is hereby granted, provided that the above
  10 # copyright notice and this permission notice appear in all copies.
  11 #
  12 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19 #
  20 #
  21
  22 #
  23 # Helper functions that implement common actions.
  24 #
  25
  26 delete_old_address() {
  27         if [ -n "$old_ip_address" ]; then
  28                 ifconfig $interface inet $old_ip_address delete $medium
  29                 route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1
  30         fi
  31 }
  32
  33 add_new_address() {
  34         ifconfig $interface \
  35                 inet $new_ip_address \
  36                 netmask $new_subnet_mask \
  37                 broadcast $new_broadcast_address \
  38                 $medium
  39
  40         # XXX Original TIMEOUT code did not do this unless $new_routers was set?
  41         route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
  42 }
  43
  44 delete_old_alias() {
  45         if [ -n "$alias_ip_address" ]; then
  46                 ifconfig $interface inet $alias_ip_address delete > /dev/null 2>&1
  47                 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
  48         fi
  49 }
  50
  51 add_new_alias() {
  52         if [ -n "$alias_ip_address" ]; then
  53                 ifconfig $interface inet $alias_ip_address alias netmask \
  54                     $alias_subnet_mask
  55                 route add $alias_ip_address 127.0.0.1
  56         fi
  57 }
  58
  59 delete_old_routes() {
  60         if [ -n "$old_static_routes" ]; then
  61                 set $old_static_routes
  62                 while [ $# -gt 1 ]; do
  63                         route delete "$1" "$2"
  64                         shift; shift
  65                 done
  66         fi
  67
  68         arp -dan
  69 }
  70
  71 add_new_routes() {
  72         for router in $new_routers; do
  73                 route delete default >/dev/null 2>&1
  74                 if [ "$new_ip_address" = "$router" ]; then
  75                         route add default -iface $router >/dev/null 2>&1
  76                 else
  77                         route add default $router >/dev/null 2>&1
  78                 fi
  79                 # 2nd and subsequent default routers error out, so explicitly
  80                 # stop processing the list after the first one.
  81                 break
  82         done
  83
  84         if [ -n "$new_static_routes" ]; then
  85                 set $new_static_routes
  86                 while [ $# -gt 1 ]; do
  87                         route add $1 $2
  88                         shift; shift
  89                 done
  90         fi
  91 }
  92
  93 add_new_resolv_conf() {
  94         # XXX Old code did not create/update resolv.conf unless both
  95         # $new_domain_name and $new_domain_name_servers were provided.  PR
  96         # #3135 reported some ISPs only provide $new_domain_name_servers and
  97         # thus broke the script. This code creates the resolv.conf if either
  98         # are provided.
  99
 100         rm -f /etc/resolv.conf.std
 101
 102         if [ -n "$new_domain_name" ]; then
 103                 echo "search $new_domain_name" >>/etc/resolv.conf.std
 104         fi
 105
 106         if [ -n "$new_domain_name_servers" ]; then
 107                 for nameserver in $new_domain_name_servers; do
 108                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
 109                 done
 110         fi
 111
 112         if [ -f /etc/resolv.conf.std ]; then
 113                 if [ -f /etc/resolv.conf.tail ]; then
 114                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
 115                 fi
 116
 117                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
 118                 # is a symbolic link, take care to preserve the link and write
 119                 # the new data in the correct location.
 120
 121                 if [ -f /etc/resolv.conf ]; then
 122                         cat /etc/resolv.conf > /etc/resolv.conf.save
 123                 fi
 124                 cat /etc/resolv.conf.std > /etc/resolv.conf
 125                 rm -f /etc/resolv.conf.std
 126
 127                 # Try to ensure correct ownership and permissions.
 128                 chown -RL root:wheel /etc/resolv.conf
 129                 chmod -RL 644 /etc/resolv.conf
 130
 131                 return 0
 132         fi
 133
 134         return 1
 135 }
 136
 137 #
 138 # Start of active code.
 139 #
 140
 141 case $reason in
 142 MEDIUM)
 143         ifconfig $interface $medium
 144         sleep 1
 145         ;;
 146
 147 PREINIT)
 148         delete_old_alias
 149         ifconfig $interface up
 150         ;;
 151
 152 ARPCHECK|ARPSEND)
 153         ;;
 154
 155 BOUND|RENEW|REBIND|REBOOT)
 156         if [ -n "$old_ip_address" ]; then
 157                 if [ "$old_ip_address" != "$alias_ip_address" ]; then
 158                         delete_old_alias
 159                 fi
 160                 if [ "$old_ip_address" != "$new_ip_address" ]; then
 161                         delete_old_address
 162                         delete_old_routes
 163                 fi
 164         fi
 165         if [ "$reason" = BOUND ] ||
 166            [ "$reason" = REBOOT ] ||
 167            [ -z "$old_ip_address" ] ||
 168            [ "$old_ip_address" != "$new_ip_address" ]; then
 169                 add_new_address
 170                 add_new_routes
 171         fi
 172         if [ "$new_ip_address" != "$alias_ip_address" ]; then
 173                 add_new_alias
 174         fi
 175         add_new_resolv_conf
 176         ;;
 177
 178 EXPIRE|FAIL)
 179         delete_old_alias
 180         if [ -n "$old_ip_address" ]; then
 181                 delete_old_address
 182                 delete_old_routes
 183         fi
 184         # XXX Why add alias we just deleted above?
 185         add_new_alias
 186         if [ -f /etc/resolv.conf.save ]; then
 187                 cat /etc/resolv.conf.save > /etc/resolv.conf
 188         fi
 189         ;;
 190
 191 TIMEOUT)
 192         delete_old_alias
 193         add_new_address
 194         sleep 1
 195         if [ -n "$new_routers" ]; then
 196                 set "$new_routers"
 197                 if ping -q -c 1 -w 1 "$1"; then
 198                         if [ "$new_ip_address" != "$alias_ip_address" ]; then
 199                                 add_new_alias
 200                         fi
 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 $medium
 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