405 lines
11 KiB
Bash
Executable File
405 lines
11 KiB
Bash
Executable File
#!/bin/sh
|
|
# $Id$
|
|
# $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $
|
|
# $FreeBSD: src/sbin/dhclient/dhclient-script,v 1.4 2005/06/10 03:41:18 brooks 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.
|
|
#
|
|
|
|
NETSTAT=/usr/bin/netstat
|
|
GREP=/usr/bin/grep
|
|
AWK=/usr/bin/awk
|
|
HOSTNAME=/bin/hostname
|
|
GREP=/usr/bin/grep
|
|
ROUTE=/sbin/route
|
|
SED=/usr/bin/sed
|
|
ARP=/usr/sbin/arp
|
|
IFCONFIG=/sbin/ifconfig
|
|
PFCTL=/sbin/pfctl
|
|
|
|
LOCALHOST=127.0.0.1
|
|
|
|
if [ -x /usr/bin/logger ]; then
|
|
LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
|
|
else
|
|
LOGGER="echo"
|
|
fi
|
|
|
|
#
|
|
# Helper functions that implement common actions.
|
|
#
|
|
|
|
check_hostname() {
|
|
current_hostname=`$HOSTNAME`
|
|
if [ -z "$current_hostname" ] || \
|
|
[ "$current_hostname" = "$old_host_name" -a \
|
|
"$new_hostname" != "$old_host_name" ]; then
|
|
$LOGGER "New Hostname ($interface): $new_host_name"
|
|
$HOSTNAME $new_host_name
|
|
fi
|
|
}
|
|
|
|
arp_flush() {
|
|
$ARP -an -i $interface | \
|
|
$SED -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \
|
|
/bin/sh >/dev/null 2>&1
|
|
}
|
|
|
|
# NOTE: use of the below has been disabled because rc.newwanip handles this correctly and this
|
|
# unnecessarily killed states in multiple circumstances. Leaving here for now, should be safe
|
|
# to remove later. -cmb 20141105
|
|
delete_old_states() {
|
|
$LOGGER "Starting delete_old_states()"
|
|
_FLUSHED=0
|
|
# If the IP changed, remove states from the old one
|
|
if [ -f /var/db/${interface}_ip ]; then
|
|
OLD_IP=`cat /var/db/${interface}_ip`
|
|
$LOGGER "Comparing IPs: Old: ${OLD_IP} New: ${new_ip_address}"
|
|
if [ -n "${OLD_IP}" ] && [ "${OLD_IP}" != "${new_ip_address}" ]; then
|
|
$LOGGER "Removing states from old IP '${OLD_IP}' (new IP '${new_ip_address}')"
|
|
${PFCTL} -i $interface -Fs
|
|
${PFCTL} -K ${OLD_IP}/32
|
|
_FLUSHED=1
|
|
fi
|
|
fi
|
|
# Delete states through old gateway if it's not the same
|
|
OLD_ROUTER=""
|
|
if [ -n "${old_routers}" ]; then
|
|
OLD_ROUTER=$old_routers
|
|
elif [ -f /tmp/${interface}_router ]; then
|
|
OLD_ROUTER=`cat /tmp/${interface}_router`
|
|
fi
|
|
if [ ${_FLUSHED} -eq 0 -a -n "${OLD_ROUTER}" ]; then
|
|
$LOGGER "Comparing Routers: Old: ${OLD_ROUTER} New: ${new_routers}"
|
|
if [ "${OLD_ROUTER}" != "${new_routers}" ]; then
|
|
$LOGGER "Removing states through old gateway '${OLD_ROUTER}' (new gateway '${new_routers}')"
|
|
${PFCTL} -i $interface -Fs
|
|
fi
|
|
fi
|
|
}
|
|
|
|
delete_old_address() {
|
|
/bin/rm -f /var/db/${interface}_ip
|
|
$IFCONFIG $interface inet -alias $old_ip_address $medium
|
|
}
|
|
|
|
add_new_address() {
|
|
|
|
$LOGGER "Starting add_new_address()"
|
|
|
|
$LOGGER "ifconfig $interface inet $new_ip_address netmask $new_subnet_mask broadcast $new_broadcast_address $medium"
|
|
|
|
$IFCONFIG $interface \
|
|
inet $new_ip_address \
|
|
netmask $new_subnet_mask \
|
|
broadcast $new_broadcast_address \
|
|
$medium
|
|
$IFCONFIG $interface setfirst $new_ip_address
|
|
|
|
$LOGGER "New IP Address ($interface): $new_ip_address"
|
|
$LOGGER "New Subnet Mask ($interface): $new_subnet_mask"
|
|
$LOGGER "New Broadcast Address ($interface): $new_broadcast_address"
|
|
$LOGGER "New Routers ($interface): $new_routers"
|
|
|
|
|
|
# This is necessary otherwise apinger will try to ping all 1s address
|
|
if [ -n "$new_routers" ] && [ "$new_routers" != "255.255.255.255" ]; then
|
|
echo $new_routers > /tmp/${interface}_router
|
|
fi
|
|
echo $new_ip_address > /var/db/${interface}_ip
|
|
}
|
|
|
|
delete_old_alias() {
|
|
if [ -n "$alias_ip_address" ]; then
|
|
$IFCONFIG $interface inet -alias $alias_ip_address > /dev/null 2>&1
|
|
$ROUTE delete $alias_ip_address $LOCALHOST > /dev/null 2>&1
|
|
fi
|
|
}
|
|
|
|
add_new_alias() {
|
|
if [ -n "$alias_ip_address" ]; then
|
|
$IFCONFIG $interface inet alias $alias_ip_address netmask \
|
|
$alias_subnet_mask
|
|
$ROUTE add $alias_ip_address $LOCALHOST
|
|
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() {
|
|
$LOGGER "Deleting old routes"
|
|
|
|
if [ -n "$old_classless_routes" ]; then
|
|
fill_classless_routes "$old_classless_routes"
|
|
set $classless_routes
|
|
while [ $# -gt 1 ]; do
|
|
route delete "$1" "$2"
|
|
shift; shift
|
|
done
|
|
return 0;
|
|
fi
|
|
|
|
# Only allow the default route to be overridden if it's on our own interface
|
|
if [ -f "/tmp/${interface}_defaultgw" ]; then
|
|
for router in $old_routers; do
|
|
$ROUTE delete default $router >/dev/null 2>&1
|
|
/bin/rm -f /tmp/${interface}_router
|
|
done
|
|
fi
|
|
|
|
if [ -n "$old_static_routes" ]; then
|
|
set $old_static_routes
|
|
while [ $# -gt 1 ]; do
|
|
$ROUTE delete "$1" "$2"
|
|
shift; shift
|
|
/bin/rm -f /tmp/${interface}_router
|
|
done
|
|
fi
|
|
|
|
arp_flush
|
|
}
|
|
|
|
add_new_routes() {
|
|
$LOGGER "Adding new routes to interface: $interface"
|
|
|
|
# RFC 3442: If the DHCP server returns both a Classless Static
|
|
# Routes option and a Router option, the DHCP client MUST ignore
|
|
# the Router option.
|
|
#
|
|
# DHCP clients that support this option (Classless Static Routes)
|
|
# MUST NOT install the routes specified in the Static Routes
|
|
# option (option code 33) if both a Static Routes option and the
|
|
# Classless Static Routes option are provided.
|
|
if [ -n "$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" "$2"
|
|
fi
|
|
shift; shift
|
|
done
|
|
return
|
|
fi
|
|
|
|
ADDED_ROUTE=no
|
|
EXISTSGW=`/bin/ls -l /tmp/*_defaultgw | /usr/bin/wc -l`
|
|
# Only allow the default route to be overridden if it's on our own interface
|
|
if [ -f "/tmp/${interface}_defaultgw" -o $EXISTSGW -eq 0 ]; then
|
|
$ROUTE delete default
|
|
for router in $new_routers; do
|
|
if [ "$new_ip_address" = "$router" -o "$router" = "255.255.255.255" ]; then
|
|
$ROUTE add default -iface $interface
|
|
echo $ROUTE add default -iface $interface | $LOGGER
|
|
# NOTE: Do not activate this for all ones address since pf(4) will try to forward packets to it.
|
|
if [ "$new_ip_address" = "$router" ]; then
|
|
echo $router > /tmp/${interface}_router
|
|
fi
|
|
else
|
|
$ROUTE add default $router
|
|
echo $ROUTE add default $router | $LOGGER
|
|
echo $router > /tmp/${interface}_router
|
|
fi
|
|
ADDED_ROUTE=yes
|
|
# 2nd and subsequent default routers error out, so explicitly
|
|
# stop processing the list after the first one.
|
|
break
|
|
done
|
|
fi
|
|
|
|
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 $2
|
|
if [ "$ADDED_ROUTE" = "no" ]; then
|
|
echo $2 > /tmp/${interface}_router
|
|
fi
|
|
shift; shift
|
|
done
|
|
fi
|
|
}
|
|
|
|
add_new_resolv_conf() {
|
|
$LOGGER "Creating resolv.conf"
|
|
if [ -f "/var/etc/nameserver_$interface" ]; then
|
|
# Remove old entries
|
|
for nameserver in `cat /var/etc/nameserver_$interface`; do
|
|
$ROUTE delete $nameserver >/dev/null 2>&1
|
|
done
|
|
fi
|
|
if [ -n "$new_domain_name_servers" ]; then
|
|
/bin/rm -f /var/etc/nameserver_$interface
|
|
ALLOWOVERRIDE=`/usr/bin/grep dnsallowoverride /conf/config.xml | /usr/bin/wc -l`
|
|
for nameserver in $new_domain_name_servers; do
|
|
# Add a route to the nameserver out the correct interface
|
|
# so that mulitple wans work correctly with multiple dns
|
|
# also backup the nameserver for later route removal
|
|
if [ $ALLOWOVERRIDE -gt 0 ]; then
|
|
echo $nameserver >>/var/etc/nameserver_$interface
|
|
$ROUTE add $nameserver -iface $interface
|
|
fi
|
|
done
|
|
echo $new_domain_name >/var/etc/searchdomain_$interface
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
# Notify rc.newwanip of changes to an interface
|
|
notify_rc_newwanip() {
|
|
/usr/local/sbin/pfSctl -c "interface newip $interface"
|
|
}
|
|
|
|
#
|
|
# Start of active code.
|
|
#
|
|
|
|
# Invoke the local dhcp client enter hooks, if they exist.
|
|
if [ -f /etc/dhclient-enter-hooks ]; then
|
|
$LOGGER "dhclient-enter-hooks"
|
|
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 [ -x $ROUTE ]; then
|
|
# if_defaultroute=`$ROUTE -n get -inet default | $GREP interface | $AWK '{print $2}'`
|
|
#else
|
|
# $LOGGER "if_defaultroute"
|
|
# if_defaultroute="x"
|
|
#fi
|
|
|
|
$LOGGER $reason
|
|
case $reason in
|
|
MEDIUM)
|
|
$IFCONFIG $interface $medium
|
|
$IFCONFIG $interface inet -alias 0.0.0.0 $medium >/dev/null 2>&1
|
|
/bin/sleep 1
|
|
;;
|
|
|
|
PREINIT)
|
|
delete_old_alias
|
|
$IFCONFIG $interface inet 0.0.0.0 netmask 255.0.0.0 broadcast 255.255.255.255 up
|
|
/bin/rm -f /tmp/${interface}_router
|
|
;;
|
|
|
|
ARPCHECK|ARPSEND)
|
|
;;
|
|
|
|
BOUND|RENEW|REBIND|REBOOT)
|
|
check_hostname
|
|
changes="no"
|
|
if [ -n "$old_ip_address" ]; then
|
|
if [ -n "$alias_ip_address" ] && \
|
|
[ "$old_ip_address" != "$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" ] && \
|
|
[ "$new_ip_address" != "$alias_ip_address" ]; then
|
|
add_new_alias
|
|
changes="yes"
|
|
fi
|
|
add_new_resolv_conf
|
|
if [ "$changes" = "yes" ] ; then
|
|
notify_rc_newwanip
|
|
fi
|
|
;;
|
|
|
|
EXPIRE|FAIL)
|
|
delete_old_alias
|
|
if [ -n "$old_ip_address" ]; then
|
|
delete_old_address
|
|
delete_old_routes
|
|
fi
|
|
;;
|
|
|
|
TIMEOUT)
|
|
delete_old_alias
|
|
add_new_address
|
|
/bin/sleep 1
|
|
if [ -n "$new_routers" ]; then
|
|
$LOGGER "New Routers ($interface): $new_routers"
|
|
set "$new_routers"
|
|
if /sbin/ping -q -c 1 -t 1 "$1"; then
|
|
if [ "$new_ip_address" != "$alias_ip_address" ]; then
|
|
add_new_alias
|
|
fi
|
|
add_new_routes
|
|
if add_new_resolv_conf; then
|
|
notify_rc_newwanip
|
|
fi
|
|
fi
|
|
fi
|
|
$IFCONFIG $interface inet -alias $new_ip_address $medium
|
|
delete_old_routes
|
|
;;
|
|
esac
|
|
|
|
# Invoke the local dhcp client exit hooks, if they exist.
|
|
if [ -f /etc/dhclient-exit-hooks ]; then
|
|
$LOGGER "dhclient-exit-hooks"
|
|
exit_status=0
|
|
. /etc/dhclient-exit-hooks
|
|
# allow the local script to abort processing of this state
|
|
# local script must set exit_status variable to nonzero.
|
|
exit $exit_status
|
|
fi
|