diff --git a/sbin/dhclient/dhclient-script.sh b/sbin/dhclient/dhclient-script.sh new file mode 100644 index 000000000000..737948098d74 --- /dev/null +++ b/sbin/dhclient/dhclient-script.sh @@ -0,0 +1,511 @@ +#!/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 +#############################################################################