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obrien 2000-07-27 20:49:27 +00:00
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#!/bin/sh
#############################################################################
#
# Copyright (c) 1999, MindStep Corporation
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#
#############################################################################
#
# This script was written by Patrick Bihan-Faou, patrick@mindstep.com,
# Please contact us for bug reports, etc.
#
#############################################################################
# $MindStep_Id: dhclient-script.sh,v 1.8 1999/12/07 22:11:08 patrick Exp $
# $MindStep_Tag: CONTRIB_19991207 $
#############################################################################
#############################################################################
# hook functions prototypes
#
# The "pre_state_XXX_hook" functions are called before the main
# work is done for the state XXX
#
# The "post_state_XXX_hook" functions are called after the main
# work is done for the state XXX
#
# These functions are meant to be overridden by the user's
# dhclient-enter-hooks file
#############################################################################
pre_state_MEDIUM_hook () { }
pre_state_PREINIT_hook () { }
pre_state_ARPCHECK_hook () { }
pre_state_ARPSEND_hook () { }
pre_state_RENEW_hook () { }
pre_state_REBIND_hook () { }
pre_state_BOUND_hook () { }
pre_state_REBOOT_hook () { }
pre_state_EXPIRE_hook () { }
pre_state_FAIL_hook () { }
pre_state_TIMEOUT_hook () { }
post_state_MEDIUM_hook () { }
post_state_PREINIT_hook () { }
post_state_ARPCHECK_hook () { }
post_state_ARPSEND_hook () { }
post_state_RENEW_hook () { }
post_state_REBIND_hook () { }
post_state_BOUND_hook () { }
post_state_REBOOT_hook () { }
post_state_EXPIRE_hook () { }
post_state_FAIL_hook () { }
post_state_TIMEOUT_hook () { }
#############################################################################
# make_resolv_conf
#
# This function is called to update the information related to the
# DNS configuration (the resolver part)
#############################################################################
make_resolv_conf ()
{
echo search $new_domain_name >/etc/resolv.conf
for nameserver in $new_domain_name_servers; do
echo nameserver $nameserver >>/etc/resolv.conf
done
}
# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
exit_with_hooks () {
exit_status=$1
if [ -x /etc/dhclient-exit-hooks ]; then
. /etc/dhclient-exit-hooks
fi
# probably should do something with exit status of the local script
return $exit_status
}
#############################################################################
# set_XXX
# unset_XXX
#
# These function each deal with one particular setting.
# They are OS dependent and may be overridden in the
# dhclient-enter-hooks file if needed.
#
# These functions are called with either "new" or "old" to indicate which
# set of variables to use (new_ip_address or old_ip_address...)
#
#############################################################################
update_hostname ()
{
local current_hostname=`/bin/hostname`
if [ "$current_hostname" = "" ] || \
[ "$current_hostname" = "$old_host_name" ]
then
if [ "$new_host_name" != "$old_host_name" ]
then
$LOGGER "New Hostname: $new_host_name"
hostname $new_host_name
fi
fi
}
set_ip_address ()
{
local ip
local mask
local bcast
if [ $# -lt 1 ]
then
return 1
fi
eval ip="\$${1}_ip_address"
eval mask="\$${1}_subnet_mask"
eval bcast="\$${1}_broadcast_address"
if [ "$ip" != "" ]
then
ifconfig $interface inet $ip netmask $mask broadcast $bcast $medium
# route add $ip 127.0.0.1 > /dev/null 2>&1
fi
}
unset_ip_address ()
{
local ip
if [ $# -lt 1 ]
then
return 1
fi
eval ip="\$${1}_ip_address"
if [ "$ip" != "" ]
then
ifconfig $interface inet -alias $ip $medium
# route delete $ip 127.0.0.1 > /dev/null 2>&1
fi
}
set_ip_alias ()
{
if [ "$alias_ip_address" != "" ]
then
ifconfig $interface inet alias $alias_ip_address netmask $alias_subnet_mask
# route add $alias_ip_address 127.0.0.1
fi
}
unset_ip_alias ()
{
if [ "$alias_ip_address" != "" ]
then
ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
# route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
fi
}
set_routers ()
{
local router_list
if [ $# -lt 1 ]
then
return 1
fi
eval router_list="\$${1}_routers"
for router in $router_list
do
route add default $router >/dev/null 2>&1
done
}
unset_routers ()
{
local router_list
if [ $# -lt 1 ]
then
return 1
fi
eval router_list="\$${1}_routers"
for router in $router_list
do
route delete default $router >/dev/null 2>&1
done
}
set_static_routes ()
{
local static_routes
if [ $# -lt 1 ]
then
return 1
fi
eval static_routes="\$${1}_static_routes"
set static_routes
while [ $# -ge 2 ]
do
$LOGGER "New Static Route: $1 -> $2"
route add $1 $2
shift; shift
done
}
unset_static_routes ()
{
local static_routes
if [ $# -lt 1 ]
then
return 1
fi
eval static_routes="\$${1}_static_routes"
set static_routes
while [ $# -ge 2 ]
do
route delete $1 $2
shift; shift
done
}
#############################################################################
#
# utility functions grouping what needs to be done in logical units.
#
#############################################################################
set_all ()
{
set_ip_address new
set_routers new
set_static_routes new
if [ "$new_ip_address" != "$alias_ip_address" ]
then
set_ip_alias
fi
}
set_others ()
{
update_hostname
make_resolv_conf
}
clear_arp_table ()
{
arp -d -a
}
unset_all ()
{
if [ "$alias_ip_address" != "$old_ip_address" ]
then
unset_ip_alias
fi
if [ "$old_ip_address" != "" ]
then
unset_ip_address old
unset_routers old
unset_static_routes old
clear_arp_table
fi
}
test_new_lease ()
{
local rc
set $new_routers
if [ $# -ge 1 ]
then
set_ip_address new
if ping -q -c 1 $1
then
rc=0
else
rc=1
fi
unset_ip_address new
else
rc=1
fi
return $rc
}
#############################################################################
# Main State functions.
#
# There is a state function for each state of the DHCP client
# These functions are OS specific and should be be tampered with.
#############################################################################
in_state_MEDIUM ()
{
ifconfig $interface $medium
ifconfig $interface inet -alias 0.0.0.0 $medium >/dev/null 2>&1
sleep 1
exit_status=0
}
in_state_PREINIT ()
{
unset_ip_alias
ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
broadcast 255.255.255.255 up
exit_status=0
}
in_state_ARPCHECK ()
{
exit_status=0
}
in_state_ARPSEND ()
{
exit_status=0
}
in_state_RENEW ()
{
if [ "$old_ip_address" != "$new_ip_address" ]
then
unset_all
set_all
fi
set_others
}
in_state_REBIND () {
in_state_RENEW
}
in_state_BOUND () {
unset_all
set_all
set_others
}
in_state_REBOOT () {
in_state_BOUND
}
in_state_EXPIRE ()
{
unset_all
set_ip_alias
exit_status=0
}
in_state_FAIL () {
in_state_EXPIRE
}
in_state_TIMEOUT ()
{
unset_all
if test_new_lease
then
set_all
set_others
else
$LOGGER "No good lease information in TIMEOUT state"
set_ip_alias
exit_status=1
fi
}
#############################################################################
# Main functions:
#
# dhclient_script_init() parses the optional "enter_hooks" script which can
# override any of the state functions
#
# This function also parses the variables and notifies the detected changes.
#############################################################################
dhclient_script_init ()
{
if [ -x /usr/bin/logger ]; then
LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
else
LOGGER=echo
fi
# Invoke the local dhcp client enter hooks, if they exist.
if [ -x /etc/dhclient-enter-hooks ]
then
exit_status=0
. /etc/dhclient-enter-hooks
# allow the local script to abort processing of this state
# local script must set exit_status variable to nonzero.
if [ $exit_status -ne 0 ]
then
exit $exit_status
fi
fi
if [ "$new_network_number" != "" ]
then
$LOGGER "New Network Number: $new_network_number"
fi
if [ "$new_ip_address" != "" ]
then
$LOGGER "New IP Address: $new_ip_address"
fi
if [ "$new_broadcast_address" != "" ]
then
$LOGGER "New Broadcast Address: $new_broadcast_address"
fi
if [ "$new_subnet_mask" != "" ]
then
$LOGGER "New Subnet Mask for $interface: $new_subnet_mask"
fi
if [ "$alias_subnet_mask" != "" ]
then
fi
}
#############################################################################
# dhclient_main() does the appropriate work depending on the state of
# the dhcp client
#############################################################################
dhclient_script_main ()
{
# set -x
exit_status=0
case $reason in
MEDIUM|\
PREINIT|\
ARPCHECK|\
ARPSEND|\
RENEW|\
REBIND|\
BOUND|\
REBOOT|\
EXPIRE|\
FAIL|\
TIMEOUT)
pre_state_${reason}_hook
in_state_${reason}
post_state_${reason}_hook
;;
*)
$LOGGER "dhclient-script called with invalid reason $reason"
exit_status=1
;;
esac
exit_with_hooks $exit_status
}
#############################################################################
# Let's do the work...
#############################################################################
dhclient_script_init
dhclient_script_main
exit $exit_status
#############################################################################
# That's all folks
#############################################################################