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         # Delete existing default route. We only allow one, so no need to
  61         # process $old_routers list.
  62         route delete default >/dev/null 2>&1
  63
  64         if [ -n "$old_static_routes" ]; then
  65                 set $old_static_routes
  66                 while [ $# -gt 1 ]; do
  67                         route delete "$1" "$2"
  68                         shift; shift
  69                 done
  70         fi
  71
  72         arp -dan
  73 }
  74
  75 add_new_routes() {
  76         route delete default >/dev/null 2>&1
  77         for router in $new_routers; do
  78                 if [ "$new_ip_address" = "$router" ]; then
  79                         route add default -iface $router >/dev/null 2>&1
  80                 else
  81                         route add default $router >/dev/null 2>&1
  82                 fi
  83                 # 2nd and subsequent default routers error out, so explicitly
  84                 # stop processing the list after the first one.
  85                 break
  86         done
  87
  88         if [ -n "$new_static_routes" ]; then
  89                 set $new_static_routes
  90                 while [ $# -gt 1 ]; do
  91                         route add $1 $2
  92                         shift; shift
  93                 done
  94         fi
  95 }
  96
  97 add_new_resolv_conf() {
  98         # XXX Old code did not create/update resolv.conf unless both
  99         # $new_domain_name and $new_domain_name_servers were provided.  PR
 100         # #3135 reported some ISPs only provide $new_domain_name_servers and
 101         # thus broke the script. This code creates the resolv.conf if either
 102         # are provided.
 103
 104         rm -f /etc/resolv.conf.std
 105
 106         if [ -n "$new_domain_name" ]; then
 107                 echo "search $new_domain_name" >>/etc/resolv.conf.std
 108         fi
 109
 110         if [ -n "$new_domain_name_servers" ]; then
 111                 for nameserver in $new_domain_name_servers; do
 112                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
 113                 done
 114         fi
 115
 116         if [ -f /etc/resolv.conf.std ]; then
 117                 if [ -f /etc/resolv.conf.tail ]; then
 118                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
 119                 fi
 120
 121                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
 122                 # is a symbolic link, take care to preserve the link and write
 123                 # the new data in the correct location.
 124
 125                 if [ -f /etc/resolv.conf ]; then
 126                         cat /etc/resolv.conf > /etc/resolv.conf.save
 127                 fi
 128                 cat /etc/resolv.conf.std > /etc/resolv.conf
 129                 rm -f /etc/resolv.conf.std
 130
 131                 # Try to ensure correct ownership and permissions.
 132                 chown -RL root:wheel /etc/resolv.conf
 133                 chmod -RL 644 /etc/resolv.conf
 134
 135                 return 0
 136         fi
 137
 138         return 1
 139 }
 140
 141 #
 142 # Start of active code.
 143 #
 144
 145 case $reason in
 146 MEDIUM)
 147         ifconfig $interface $medium
 148         sleep 1
 149         ;;
 150
 151 PREINIT)
 152         delete_old_alias
 153         ifconfig $interface up
 154         ;;
 155
 156 ARPCHECK|ARPSEND)
 157         ;;
 158
 159 BOUND|RENEW|REBIND|REBOOT)
 160         if [ -n "$old_ip_address" ]; then
 161                 if [ "$old_ip_address" != "$alias_ip_address" ]; then
 162                         delete_old_alias
 163                 fi
 164                 if [ "$old_ip_address" != "$new_ip_address" ]; then
 165                         delete_old_address
 166                         delete_old_routes
 167                 fi
 168         fi
 169         if [ "$reason" = BOUND ] ||
 170            [ "$reason" = REBOOT ] ||
 171            [ -z "$old_ip_address" ] ||
 172            [ "$old_ip_address" != "$new_ip_address" ]; then
 173                 add_new_address
 174                 add_new_routes
 175         fi
 176         if [ "$new_ip_address" != "$alias_ip_address" ]; then
 177                 add_new_alias
 178         fi
 179         add_new_resolv_conf
 180         ;;
 181
 182 EXPIRE|FAIL)
 183         delete_old_alias
 184         if [ -n "$old_ip_address" ]; then
 185                 delete_old_address
 186                 delete_old_routes
 187         fi
 188         # XXX Why add alias we just deleted above?
 189         add_new_alias
 190         if [ -f /etc/resolv.conf.save ]; then
 191                 cat /etc/resolv.conf.save > /etc/resolv.conf
 192         fi
 193         ;;
 194
 195 TIMEOUT)
 196         delete_old_alias
 197         add_new_address
 198         sleep 1
 199         if [ -n "$new_routers" ]; then
 200                 set "$new_routers"
 201                 if ping -q -c 1 -w 1 "$1"; then
 202                         if [ "$new_ip_address" != "$alias_ip_address" ]; then
 203                                 add_new_alias
 204                         fi
 205                         add_new_routes
 206                         if add_new_resolv_conf; then
 207                                 exit 0
 208                         fi
 209                 fi
 210         fi
 211         ifconfig $interface inet $new_ip_address delete $medium
 212         # XXX Why not a delete_old_address as before all other invocations of
 213         #     delete_old_routes?
 214         delete_old_routes
 215         exit 1
 216         ;;
 217 esac
 218
 219 exit 0