#!/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 #############################################################################