Current File : //backups/router/usr/local/opnsense/scripts/interfaces/dhclient-script
#!/bin/sh
#
# Copyright (c) 2021-2023 Franco Fichtner <franco@opnsense.org>
# 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.
IFCONFIG="/sbin/ifconfig -n"
LOGGER="/usr/bin/logger -s -p user.notice -t dhclient dhclient-script:"
#
# Helper functions that implement common actions.
#
delete_old_address()
{
eval "$IFCONFIG $interface inet -alias $old_ip_address $medium"
}
add_new_address()
{
eval "$IFCONFIG $interface \
inet $new_ip_address \
netmask $new_subnet_mask \
broadcast $new_broadcast_address \
$medium"
$LOGGER "New IP Address ($interface): $new_ip_address"
$LOGGER "New Subnet Mask ($interface): $new_subnet_mask"
$LOGGER "New Broadcast Address ($interface): $new_broadcast_address"
$LOGGER "New Routers ($interface): $new_routers"
if [ -n "$new_routers" ] && [ "$new_routers" != "255.255.255.255" ]; then
/usr/local/sbin/ifctl -i ${interface} -4rd -a ${new_routers}
fi
}
delete_old_alias()
{
if [ -n "$alias_ip_address" ]; then
$IFCONFIG $interface inet -alias $alias_ip_address > /dev/null 2>&1
fi
}
add_new_alias()
{
if [ -n "$alias_ip_address" ]; then
$IFCONFIG $interface inet alias $alias_ip_address netmask \
$alias_subnet_mask
fi
}
fill_classless_routes()
{
set $1
while [ $# -ge 5 ]; do
if [ $1 -eq 0 ]; then
route="default"
elif [ $1 -le 8 ]; then
route="$2.0.0.0/$1"
shift
elif [ $1 -le 16 ]; then
route="$2.$3.0.0/$1"
shift; shift
elif [ $1 -le 24 ]; then
route="$2.$3.$4.0/$1"
shift; shift; shift
else
route="$2.$3.$4.$5/$1"
shift; shift; shift; shift
fi
shift
router="$1.$2.$3.$4"
classless_routes="$classless_routes $route $router"
shift; shift; shift; shift
done
}
delete_old_routes()
{
if [ -n "$old_classless_routes" ]; then
fill_classless_routes "$old_classless_routes"
set $classless_routes
while [ $# -gt 1 ]; do
route delete "$1" "$2"
shift; shift
done
return 0;
fi
if [ -n "$old_static_routes" ]; then
set $old_static_routes
while [ $# -gt 1 ]; do
route delete "$1" "$2"
shift; shift
done
fi
/usr/local/sbin/ifctl -i ${interface} -4rd
arp -an -i $interface | \
sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \
sh >/dev/null 2>&1
}
add_new_routes()
{
# RFC 3442: If the DHCP server returns both a Classless Static
# Routes option and a Router option, the DHCP client MUST ignore
# the Router option.
#
# DHCP clients that support this option (Classless Static Routes)
# MUST NOT install the routes specified in the Static Routes
# option (option code 33) if both a Static Routes option and the
# Classless Static Routes option are provided.
if [ -n "$new_classless_routes" ]; then
fill_classless_routes "$new_classless_routes"
$LOGGER "New Classless Static Routes ($interface): $classless_routes"
set $classless_routes
while [ $# -gt 1 ]; do
if [ "0.0.0.0" = "$2" ]; then
route add "$1" -iface "$interface"
else
route add "$1" "$2"
fi
shift; shift
done
return
fi
for router in $new_routers; do
/usr/local/sbin/ifctl -i ${interface} -4rd -a ${router}
# 2nd and subsequent default routers error out, so explicitly
# stop processing the list after the first one.
break
done
if [ -n "$new_static_routes" ]; then
$LOGGER "New Static Routes ($interface): $new_static_routes"
set $new_static_routes
while [ $# -gt 1 ]; do
route add $1 $2
if [ -z "$(/usr/local/sbin/ifctl -i ${interface} -4r)" ]; then
/usr/local/sbin/ifctl -i ${interface} -4rd -a ${2}
fi
shift; shift
done
fi
}
add_new_resolv_conf()
{
$LOGGER "Creating resolv.conf"
ARGS="-i ${interface} -4nd"
for nameserver in ${new_domain_name_servers}; do
ARGS="${ARGS} -a ${nameserver}"
done
/usr/local/sbin/ifctl ${ARGS}
/usr/local/sbin/ifctl -i ${interface} -4sd ${new_domain_name:+"-a ${new_domain_name}"}
return 0
}
#
# Start of active code.
#
$LOGGER "Reason $reason on $interface executing"
case $reason in
MEDIUM)
eval "$IFCONFIG $interface $medium"
sleep 1
;;
PREINIT)
delete_old_alias
eval "$IFCONFIG $interface up"
/usr/local/sbin/ifctl -i ${interface} -4rd
;;
ARPCHECK|ARPSEND)
;;
BOUND|RENEW|REBIND|REBOOT)
if [ -n "$new_host_name" ]; then
$LOGGER "New Hostname ($interface): $new_host_name"
fi
changes="no"
if [ -n "$old_ip_address" ]; then
if [ -n "$alias_ip_address" -a "$old_ip_address" != "$alias_ip_address" ]; then
delete_old_alias
changes="yes"
fi
if [ "$old_ip_address" != "$new_ip_address" ]; then
delete_old_address
delete_old_routes
changes="yes"
fi
fi
if [ "$reason" = BOUND ] || \
[ "$reason" = REBOOT ] || \
[ -z "$old_ip_address" ] || \
[ "$old_ip_address" != "$new_ip_address" ]; then
add_new_address
add_new_routes
changes="yes"
fi
if [ -n "$alias_ip_address" -a "$new_ip_address" != "$alias_ip_address" ]; then
add_new_alias
changes="yes"
fi
add_new_resolv_conf
if [ "$changes" = "yes" ] ; then
/usr/local/sbin/configctl -d interface newip $interface force
fi
;;
EXPIRE|FAIL)
delete_old_alias
if [ -n "$old_ip_address" ]; then
delete_old_address
delete_old_routes
fi
add_new_alias
;;
TIMEOUT)
delete_old_alias
add_new_address
sleep 1
if [ -n "$new_routers" ]; then
$LOGGER "New Routers ($interface): $new_routers"
set "$new_routers"
if ping -q -c 1 -t 1 "$1"; then
if [ "$new_ip_address" != "$alias_ip_address" ]; then
add_new_alias
fi
add_new_routes
add_new_resolv_conf
/usr/local/sbin/configctl -d interface newip $interface force
exit 0
fi
fi
eval "$IFCONFIG $interface inet -alias $new_ip_address $medium"
delete_old_routes
/usr/local/sbin/configctl -d interface newip $interface
exit 1
;;
esac
exit 0
Mini Shell