NetBSD/usr.sbin/dhcp/clientscript/dhclient-script

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#!/bin/sh
#
# $NetBSD: dhclient-script,v 1.5 2002/05/28 15:04:01 christos Exp $
ENTERHOOKS=/etc/dhclient-enter-hooks
EXITHOOKS=/etc/dhclient-exit-hooks
RESOLV=/etc/resolv.conf
SIGNATURE="# Created by dhclient at: "
make_resolv_conf() {
if [ ! -z "$new_domain_name_servers" ]; then
if [ -f $RESOLV ]
then
while read line; do
case $line in
"$SIGNATURE"*)
;;
*)
mv $RESOLV $RESOLV.save;;
esac
break
done < $RESOLV
fi
echo "$SIGNATURE$(date)" > $RESOLV
if [ ! -z "$new_domain_name" ]
then
echo search $new_domain_name >> $RESOLV
fi
for nameserver in $new_domain_name_servers; do
echo nameserver $nameserver
done >> $RESOLV
fi
}
restore_resolv_conf() {
if [ -f $RESOLV.save -a -f $RESOLV ]
then
while read line; do
case $line in
"$SIGNATURE"*)
mv $RESOLV.save $RESOLV;;
esac
break
done < $RESOLV
fi
}
# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
exit_with_hooks() {
exit_status=$1
if [ -f "$EXITHOOKS" ]; then
. "$EXITHOOKS"
fi
# probably should do something with exit status of the local script
exit $exit_status
}
add_new_routes() {
for router in $new_routers; do
route add default $router
done >/dev/null 2>&1
set -- $new_static_routes
while [ $# -gt 1 ]; do
route add $0 $1
shift; shift
done
}
delete_old_routes() {
for router in $old_routers; do
route delete default $router
done >/dev/null 2>&1
set -- $old_static_routes
while [ $# -gt 1 ]; do
route delete $1 $2
shift; shift
done
arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/p' | sh
}
# Invoke the local dhcp client enter hooks, if they exist.
if [ -f $ENTERHOOKS ]; then
exit_status=0
. $ENTERHOOKS
# 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 $exit_status
fi
fi
if [ ! -z "$new_host_name" ]; then
echo New Host Name: $new_host_name
fi
if [ ! -z "$new_nis_domain" ]; then
echo New NIS Domain: $new_nis_domain
fi
if [ ! -z "$new_network_number" ]; then
echo New Network Number: $new_network_number
fi
if [ ! -z "$new_broadcast_address" ]; then
echo New Broadcast Address: $new_broadcast_address
new_broadcast_arg="broadcast $new_broadcast_address"
fi
if [ ! -z "$old_broadcast_address" ]; then
old_broadcast_arg="broadcast $old_broadcast_address"
fi
if [ ! -z "$new_subnet_mask" ]; then
new_netmask_arg="netmask $new_subnet_mask"
fi
if [ ! -z "$old_subnet_mask" ]; then
old_netmask_arg="netmask $old_subnet_mask"
fi
if [ ! -z "$alias_subnet_mask" ]; then
alias_subnet_arg="netmask $alias_subnet_mask"
fi
case "$reason" in
MEDIUM)
eval "ifconfig $interface $medium"
eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1
sleep 1
exit_with_hooks 0
;;
PREINIT)
if [ ! -z "$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
ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
broadcast 255.255.255.255 up
exit_with_hooks 0
;;
ARPCHECK|ARPSEND)
exit_with_hooks 0
;;
BOUND|RENEW|REBIND|REBOOT)
if [ ! -z "$new_nis_domain" ]; then
if type domainname > /dev/null 2>&1; then
domainname $new_nis_domain
fi
fi
if type hostname > /dev/null 2>&1; then
if [ \( -z "$current_hostname" \) -o \
\( "x$new_host_name" = "x$old_hostname" \) ]; then
current_hostname=`hostname`
fi
if [ \( -z "$current_hostname" \) -o \
\( "x$new_host_name" != "x$old_hostname" \) ]; then
hostname $new_host_name
fi
fi
if [ \( ! -z "$old_ip_address" \) -a \( ! -z "$alias_ip_address" \) -a \
\( "x$alias_ip_address" != "x$old_ip_address" \) ]; 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
if [ \( ! -z "$old_ip_address" \) -a \
\( "x$old_ip_address" != "x$new_ip_address" \) ]; then
eval "ifconfig $interface inet -alias $old_ip_address $medium"
route delete $old_ip_address 127.0.0.1 >/dev/null 2>&1
delete_old_routes
fi
if [ \( -z "$old_ip_address" \) -o \
\( "x$old_ip_address" != "x$new_ip_address" \) -o \
\( "x$reason" = "xBOUND" \) -o \( "x$reason" = "xREBOOT" \) ]; then
eval "ifconfig $interface inet $new_ip_address \
$new_netmask_arg $new_broadcast_arg $medium"
route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
add_new_routes
fi
if [ \( ! -z "$alias_ip_address" \) -a \
\( "x$new_ip_address" != "x$alias_ip_address" \) ]; then
ifconfig $interface inet alias $alias_ip_address \
$alias_subnet_arg
route add $alias_ip_address 127.0.0.1
fi
make_resolv_conf
exit_with_hooks 0
;;
EXPIRE|FAIL|RELEASE|STOP)
if [ ! -z "$old_nis_domain" ]; then
if type domainname > /dev/null 2>&1; then
# delete the old nis domain name
domainname ""
fi
fi
if [ ! -z "$alias_ip_address" ]; then
ifconfig $interface inet -alias $alias_ip_address
route delete $alias_ip_address 127.0.0.1
fi > /dev/null 2>&1
if [ ! -z "$old_ip_address" ]; then
eval "ifconfig $interface inet -alias $old_ip_address $medium"
route delete $old_ip_address 127.0.0.1 >/dev/null 2>&1
delete_old_routes
fi
if [ ! -z "$alias_ip_address" ]; then
ifconfig $interface inet alias $alias_ip_address \
$alias_subnet_arg
route add $alias_ip_address 127.0.0.1
fi
restore_resolv_conf
exit_with_hooks 0
;;
TIMEOUT)
if [ ! -z "$alias_ip_address" ]; then
ifconfig $interface inet -alias $alias_ip_address
route delete $alias_ip_address 127.0.0.1
fi > /dev/null 2>&1
if [ ! -z "$new_host_name" ]; then
if type hostname > /dev/null 2>&1; then
hostname $new_host_name
fi
fi
if [ ! -z "$new_nis_domain" ]; then
if type domainname > /dev/null 2>&1; then
domainname $new_nis_domain
fi
fi
eval "ifconfig $interface inet $new_ip_address $new_netmask_arg \
$new_broadcast_arg $medium"
sleep 1
if [ ! -z "$new_routers" ]; then
set -- $new_routers
if ping -n -q -c 1 -w 1 $1; then
if [ \( ! -z "$alias_ip_address" \) -a \
\( "x$new_ip_address" != "x$alias_ip_address" \) ]
then
ifconfig $interface inet alias \
$alias_ip_address $alias_subnet_arg
route add $alias_ip_address 127.0.0.1
fi
route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
add_new_routes
make_resolv_conf
exit_with_hooks 0
fi
fi
eval "ifconfig $interface inet -alias $new_ip_address $medium"
delete_old_routes
exit_with_hooks 1
;;
*)
exit_with_hooks 0
;;
esac