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|
#!/bin/sh
#
# $OpenBSD: dhclient-script,v 1.12 2007/08/11 17:58:55 krw Exp $
#
# Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
#
#
# Helper functions that implement common actions.
#
delete_old_address() {
if [ -n "$old_ip_address" ]; then
ifconfig $interface inet $old_ip_address delete $medium
route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1
fi
}
add_new_address() {
ifconfig $interface \
inet $new_ip_address \
netmask $new_subnet_mask \
broadcast $new_broadcast_address \
$medium
# XXX Original TIMEOUT code did not do this unless $new_routers was set?
route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
}
delete_old_alias() {
if [ -n "$alias_ip_address" ]; then
ifconfig $interface inet $alias_ip_address delete > /dev/null 2>&1
route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
fi
}
add_new_alias() {
if [ -n "$alias_ip_address" ]; then
ifconfig $interface inet $alias_ip_address alias netmask \
$alias_subnet_mask
route add $alias_ip_address 127.0.0.1
fi
}
delete_old_routes() {
# Delete existing default route. We only allow one, so no need to
# process $old_routers list.
route delete default >/dev/null 2>&1
if [ -n "$old_static_routes" ]; then
set $old_static_routes
while [ $# -gt 1 ]; do
route delete "$1" "$2"
shift; shift
done
fi
arp -dan
}
add_new_routes() {
route delete default >/dev/null 2>&1
for router in $new_routers; do
if [ "$new_ip_address" = "$router" ]; then
route add default -iface $router >/dev/null 2>&1
else
route add default $router >/dev/null 2>&1
fi
# 2nd and subsequent default routers error out, so explicitly
# stop processing the list after the first one.
break
done
if [ -n "$new_static_routes" ]; then
set $new_static_routes
while [ $# -gt 1 ]; do
route add $1 $2
shift; shift
done
fi
}
add_new_resolv_conf() {
# XXX Old code did not create/update resolv.conf unless both
# $new_domain_name and $new_domain_name_servers were provided. PR
# #3135 reported some ISPs only provide $new_domain_name_servers and
# thus broke the script. This code creates the resolv.conf if either
# are provided.
rm -f /etc/resolv.conf.std
if [ -n "$new_domain_name" ]; then
echo "search $new_domain_name" >>/etc/resolv.conf.std
fi
if [ -n "$new_domain_name_servers" ]; then
for nameserver in $new_domain_name_servers; do
echo "nameserver $nameserver" >>/etc/resolv.conf.std
done
fi
if [ -f /etc/resolv.conf.std ]; then
if [ -f /etc/resolv.conf.tail ]; then
cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
fi
# In case (e.g. during OpenBSD installs) /etc/resolv.conf
# is a symbolic link, take care to preserve the link and write
# the new data in the correct location.
if [ -f /etc/resolv.conf ]; then
cat /etc/resolv.conf > /etc/resolv.conf.save
fi
cat /etc/resolv.conf.std > /etc/resolv.conf
rm -f /etc/resolv.conf.std
# Try to ensure correct ownership and permissions.
chown -RL root:wheel /etc/resolv.conf
chmod -RL 644 /etc/resolv.conf
return 0
fi
return 1
}
#
# Start of active code.
#
case $reason in
MEDIUM)
ifconfig $interface $medium
sleep 1
;;
PREINIT)
delete_old_alias
ifconfig $interface up
;;
ARPCHECK|ARPSEND)
;;
BOUND|RENEW|REBIND|REBOOT)
if [ -n "$old_ip_address" ]; then
if [ "$old_ip_address" != "$alias_ip_address" ]; then
delete_old_alias
fi
if [ "$old_ip_address" != "$new_ip_address" ]; then
delete_old_address
delete_old_routes
fi
fi
if [ "$reason" = BOUND ] ||
[ "$reason" = REBOOT ] ||
[ -z "$old_ip_address" ] ||
[ "$old_ip_address" != "$new_ip_address" ]; then
add_new_address
add_new_routes
fi
if [ "$new_ip_address" != "$alias_ip_address" ]; then
add_new_alias
fi
add_new_resolv_conf
;;
EXPIRE|FAIL)
delete_old_alias
if [ -n "$old_ip_address" ]; then
delete_old_address
delete_old_routes
fi
# XXX Why add alias we just deleted above?
add_new_alias
if [ -f /etc/resolv.conf.save ]; then
cat /etc/resolv.conf.save > /etc/resolv.conf
fi
;;
TIMEOUT)
delete_old_alias
add_new_address
sleep 1
if [ -n "$new_routers" ]; then
set "$new_routers"
if ping -q -c 1 -w 1 "$1"; then
if [ "$new_ip_address" != "$alias_ip_address" ]; then
add_new_alias
fi
add_new_routes
if add_new_resolv_conf; then
exit 0
fi
fi
fi
ifconfig $interface inet $new_ip_address delete $medium
# XXX Why not a delete_old_address as before all other invocations of
# delete_old_routes?
delete_old_routes
exit 1
;;
esac
exit 0
|
