ff7190ffa5
don't clobber /etc/resolv.conf Add $FreeBSD. Submitted by: an j. peterson" <rbw@myplace.org> Verified fix in: dhcp-3.0.1rc6 PR: misc/34455
515 lines
11 KiB
Bash
515 lines
11 KiB
Bash
#!/bin/sh
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#############################################################################
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#
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# Copyright (c) 1999, MindStep Corporation
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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#
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#############################################################################
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#
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# This script was written by Patrick Bihan-Faou, patrick@mindstep.com,
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# Please contact us for bug reports, etc.
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#
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#############################################################################
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# $MindStep_Id: dhclient-script.sh,v 1.8 1999/12/07 22:11:08 patrick Exp $
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# $MindStep_Tag: CONTRIB_19991207 $
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# $FreeBSD$
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#############################################################################
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#############################################################################
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# hook functions prototypes
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#
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# The "pre_state_XXX_hook" functions are called before the main
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# work is done for the state XXX
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#
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# The "post_state_XXX_hook" functions are called after the main
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# work is done for the state XXX
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#
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# These functions are meant to be overridden by the user's
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# dhclient-enter-hooks file
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#############################################################################
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pre_state_MEDIUM_hook () { }
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pre_state_PREINIT_hook () { }
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pre_state_ARPCHECK_hook () { }
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pre_state_ARPSEND_hook () { }
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pre_state_RENEW_hook () { }
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pre_state_REBIND_hook () { }
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pre_state_BOUND_hook () { }
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pre_state_REBOOT_hook () { }
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pre_state_EXPIRE_hook () { }
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pre_state_FAIL_hook () { }
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pre_state_TIMEOUT_hook () { }
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post_state_MEDIUM_hook () { }
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post_state_PREINIT_hook () { }
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post_state_ARPCHECK_hook () { }
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post_state_ARPSEND_hook () { }
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post_state_RENEW_hook () { }
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post_state_REBIND_hook () { }
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post_state_BOUND_hook () { }
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post_state_REBOOT_hook () { }
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post_state_EXPIRE_hook () { }
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post_state_FAIL_hook () { }
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post_state_TIMEOUT_hook () { }
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#############################################################################
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# make_resolv_conf
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#
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# This function is called to update the information related to the
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# DNS configuration (the resolver part)
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#############################################################################
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make_resolv_conf ()
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{
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if [ "x$new_domain_name" != x ] && [ "x$new_domain_name_servers" != x ]; then
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echo search $new_domain_name >/etc/resolv.conf
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for nameserver in $new_domain_name_servers; do
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echo nameserver $nameserver >>/etc/resolv.conf
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done
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fi
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}
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# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
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exit_with_hooks () {
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exit_status=$1
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if [ -x /etc/dhclient-exit-hooks ]; then
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. /etc/dhclient-exit-hooks
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fi
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# probably should do something with exit status of the local script
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return $exit_status
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}
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#############################################################################
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# set_XXX
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# unset_XXX
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#
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# These function each deal with one particular setting.
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# They are OS dependent and may be overridden in the
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# dhclient-enter-hooks file if needed.
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#
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# These functions are called with either "new" or "old" to indicate which
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# set of variables to use (new_ip_address or old_ip_address...)
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#
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#############################################################################
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update_hostname ()
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{
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local current_hostname=`/bin/hostname`
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if [ "$current_hostname" = "" ] || \
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[ "$current_hostname" = "$old_host_name" ]
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then
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if [ "$new_host_name" != "$old_host_name" ]
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then
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$LOGGER "New Hostname: $new_host_name"
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hostname $new_host_name
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fi
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fi
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}
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set_ip_address ()
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{
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local ip
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local mask
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local bcast
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if [ $# -lt 1 ]
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then
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return 1
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fi
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eval ip="\$${1}_ip_address"
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eval mask="\$${1}_subnet_mask"
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eval bcast="\$${1}_broadcast_address"
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if [ "$ip" != "" ]
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then
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ifconfig $interface inet $ip netmask $mask broadcast $bcast $medium
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# route add $ip 127.0.0.1 > /dev/null 2>&1
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fi
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}
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unset_ip_address ()
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{
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local ip
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if [ $# -lt 1 ]
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then
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return 1
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fi
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eval ip="\$${1}_ip_address"
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if [ "$ip" != "" ]
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then
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ifconfig $interface inet -alias $ip $medium
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# route delete $ip 127.0.0.1 > /dev/null 2>&1
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fi
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}
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set_ip_alias ()
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{
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if [ "$alias_ip_address" != "" ]
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then
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ifconfig $interface inet alias $alias_ip_address netmask $alias_subnet_mask
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# route add $alias_ip_address 127.0.0.1
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fi
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}
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unset_ip_alias ()
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{
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if [ "$alias_ip_address" != "" ]
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then
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ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
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# route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
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fi
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}
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set_routers ()
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{
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local router_list
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if [ $# -lt 1 ]
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then
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return 1
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fi
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eval router_list="\$${1}_routers"
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for router in $router_list
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do
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route add default $router >/dev/null 2>&1
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done
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}
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unset_routers ()
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{
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local router_list
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if [ $# -lt 1 ]
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then
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return 1
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fi
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eval router_list="\$${1}_routers"
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for router in $router_list
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do
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route delete default $router >/dev/null 2>&1
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done
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}
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set_static_routes ()
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{
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local static_routes
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if [ $# -lt 1 ]
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then
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return 1
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fi
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eval static_routes="\$${1}_static_routes"
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set static_routes
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while [ $# -ge 2 ]
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do
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$LOGGER "New Static Route: $1 -> $2"
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route add $1 $2
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shift; shift
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done
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}
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unset_static_routes ()
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{
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local static_routes
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if [ $# -lt 1 ]
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then
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return 1
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fi
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eval static_routes="\$${1}_static_routes"
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set static_routes
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while [ $# -ge 2 ]
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do
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route delete $1 $2
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shift; shift
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done
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}
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#############################################################################
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#
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# utility functions grouping what needs to be done in logical units.
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#
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#############################################################################
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set_all ()
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{
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set_ip_address new
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set_routers new
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set_static_routes new
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if [ "$new_ip_address" != "$alias_ip_address" ]
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then
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set_ip_alias
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fi
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}
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set_others ()
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{
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update_hostname
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make_resolv_conf
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}
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clear_arp_table ()
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{
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arp -d -a
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}
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unset_all ()
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{
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if [ "$alias_ip_address" != "$old_ip_address" ]
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then
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unset_ip_alias
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fi
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if [ "$old_ip_address" != "" ]
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then
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unset_ip_address old
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unset_routers old
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unset_static_routes old
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clear_arp_table
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fi
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}
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test_new_lease ()
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{
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local rc
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set $new_routers
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if [ $# -ge 1 ]
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then
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set_ip_address new
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if ping -q -c 1 $1
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then
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rc=0
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else
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rc=1
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fi
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unset_ip_address new
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else
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rc=1
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fi
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return $rc
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}
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#############################################################################
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# Main State functions.
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#
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# There is a state function for each state of the DHCP client
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# These functions are OS specific and should be be tampered with.
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#############################################################################
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in_state_MEDIUM ()
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{
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ifconfig $interface $medium
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ifconfig $interface inet -alias 0.0.0.0 $medium >/dev/null 2>&1
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sleep 1
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exit_status=0
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}
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in_state_PREINIT ()
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{
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unset_ip_alias
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ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
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broadcast 255.255.255.255 up
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exit_status=0
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}
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in_state_ARPCHECK ()
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{
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exit_status=0
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}
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in_state_ARPSEND ()
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{
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exit_status=0
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}
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in_state_RENEW ()
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{
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if [ "$old_ip_address" != "$new_ip_address" ]
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then
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unset_all
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set_all
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fi
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set_others
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}
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in_state_REBIND () {
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in_state_RENEW
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}
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in_state_BOUND () {
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unset_all
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set_all
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set_others
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}
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in_state_REBOOT () {
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in_state_BOUND
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}
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in_state_EXPIRE ()
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{
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unset_all
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set_ip_alias
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exit_status=0
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}
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in_state_FAIL () {
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in_state_EXPIRE
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}
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in_state_TIMEOUT ()
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{
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unset_all
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if test_new_lease
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then
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set_all
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set_others
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else
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$LOGGER "No good lease information in TIMEOUT state"
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set_ip_alias
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exit_status=1
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fi
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}
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#############################################################################
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# Main functions:
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#
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# dhclient_script_init() parses the optional "enter_hooks" script which can
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# override any of the state functions
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#
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# This function also parses the variables and notifies the detected changes.
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#############################################################################
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dhclient_script_init ()
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{
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if [ -x /usr/bin/logger ]; then
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LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
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else
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LOGGER=echo
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fi
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# Invoke the local dhcp client enter hooks, if they exist.
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if [ -x /etc/dhclient-enter-hooks ]
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then
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exit_status=0
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. /etc/dhclient-enter-hooks
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# allow the local script to abort processing of this state
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# local script must set exit_status variable to nonzero.
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if [ $exit_status -ne 0 ]
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then
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exit $exit_status
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fi
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fi
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if [ "$new_network_number" != "" ]
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then
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$LOGGER "New Network Number: $new_network_number"
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fi
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if [ "$new_ip_address" != "" ]
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then
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$LOGGER "New IP Address: $new_ip_address"
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fi
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if [ "$new_broadcast_address" != "" ]
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then
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$LOGGER "New Broadcast Address: $new_broadcast_address"
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fi
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if [ "$new_subnet_mask" != "" ]
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then
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$LOGGER "New Subnet Mask for $interface: $new_subnet_mask"
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fi
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if [ "$alias_subnet_mask" != "" ]
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then
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fi
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}
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#############################################################################
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# dhclient_main() does the appropriate work depending on the state of
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# the dhcp client
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#############################################################################
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dhclient_script_main ()
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{
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# set -x
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exit_status=0
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case $reason in
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MEDIUM|\
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PREINIT|\
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ARPCHECK|\
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ARPSEND|\
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RENEW|\
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REBIND|\
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BOUND|\
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REBOOT|\
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EXPIRE|\
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FAIL|\
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TIMEOUT)
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pre_state_${reason}_hook
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in_state_${reason}
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post_state_${reason}_hook
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;;
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*)
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$LOGGER "dhclient-script called with invalid reason $reason"
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exit_status=1
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;;
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esac
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exit_with_hooks $exit_status
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}
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#############################################################################
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# Let's do the work...
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#############################################################################
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dhclient_script_init
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dhclient_script_main
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exit $exit_status
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#############################################################################
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# That's all folks
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#############################################################################
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