#!/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 # # 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 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" ]; then $LOGGER "New Hostname ($interface): $new_host_name" $HOSTNAME $new_host_name elif [ "$current_hostname" = "$old_host_name" -a \ "$new_host_name" != "$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 .*$/arp -d \1/p' | \ /bin/sh >/dev/null 2>&1 } delete_old_address() { /bin/rm -f /var/db/${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 $LOGGER "New IP Address ($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" echo $new_routers > /tmp/${interface}_router 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 echo $router > /tmp/${interface}_router 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 $nameserver done fi if [ -n "$new_domain_name_servers" ]; then /bin/rm -f /var/etc/nameserver_$interface 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 echo $nameserver >>/var/etc/nameserver_$interface $ROUTE add $nameserver -iface $interface 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 $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up /bin/rm -f /tmp/${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