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-rwxr-xr-xsrc/sbin/dhclient-script404
1 files changed, 404 insertions, 0 deletions
diff --git a/src/sbin/dhclient-script b/src/sbin/dhclient-script
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+#!/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
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