405 lines
11 KiB
Bash
Executable File
405 lines
11 KiB
Bash
Executable File
#!/bin/sh
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# $Id$
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# $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $
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# $FreeBSD: src/sbin/dhclient/dhclient-script,v 1.4 2005/06/10 03:41:18 brooks Exp $
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#
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# Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org>
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#
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#
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NETSTAT=/usr/bin/netstat
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GREP=/usr/bin/grep
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AWK=/usr/bin/awk
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HOSTNAME=/bin/hostname
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GREP=/usr/bin/grep
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ROUTE=/sbin/route
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SED=/usr/bin/sed
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ARP=/usr/sbin/arp
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IFCONFIG=/sbin/ifconfig
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PFCTL=/sbin/pfctl
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LOCALHOST=127.0.0.1
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if [ -x /usr/bin/logger ]; then
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LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
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else
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LOGGER="echo"
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fi
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#
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# Helper functions that implement common actions.
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#
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check_hostname() {
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current_hostname=`$HOSTNAME`
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if [ -z "$current_hostname" ] || \
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[ "$current_hostname" = "$old_host_name" -a \
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"$new_hostname" != "$old_host_name" ]; then
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$LOGGER "New Hostname ($interface): $new_host_name"
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$HOSTNAME $new_host_name
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fi
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}
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arp_flush() {
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$ARP -an -i $interface | \
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$SED -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \
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/bin/sh >/dev/null 2>&1
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}
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# NOTE: use of the below has been disabled because rc.newwanip handles this correctly and this
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# unnecessarily killed states in multiple circumstances. Leaving here for now, should be safe
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# to remove later. -cmb 20141105
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delete_old_states() {
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$LOGGER "Starting delete_old_states()"
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_FLUSHED=0
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# If the IP changed, remove states from the old one
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if [ -f /var/db/${interface}_ip ]; then
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OLD_IP=`cat /var/db/${interface}_ip`
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$LOGGER "Comparing IPs: Old: ${OLD_IP} New: ${new_ip_address}"
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if [ -n "${OLD_IP}" ] && [ "${OLD_IP}" != "${new_ip_address}" ]; then
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$LOGGER "Removing states from old IP '${OLD_IP}' (new IP '${new_ip_address}')"
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${PFCTL} -i $interface -Fs
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${PFCTL} -K ${OLD_IP}/32
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_FLUSHED=1
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fi
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fi
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# Delete states through old gateway if it's not the same
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OLD_ROUTER=""
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if [ -n "${old_routers}" ]; then
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OLD_ROUTER=$old_routers
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elif [ -f /tmp/${interface}_router ]; then
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OLD_ROUTER=`cat /tmp/${interface}_router`
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fi
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if [ ${_FLUSHED} -eq 0 -a -n "${OLD_ROUTER}" ]; then
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$LOGGER "Comparing Routers: Old: ${OLD_ROUTER} New: ${new_routers}"
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if [ "${OLD_ROUTER}" != "${new_routers}" ]; then
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$LOGGER "Removing states through old gateway '${OLD_ROUTER}' (new gateway '${new_routers}')"
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${PFCTL} -i $interface -Fs
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fi
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fi
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}
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delete_old_address() {
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/bin/rm -f /var/db/${interface}_ip
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$IFCONFIG $interface inet -alias $old_ip_address $medium
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}
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add_new_address() {
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$LOGGER "Starting add_new_address()"
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$LOGGER "ifconfig $interface inet $new_ip_address netmask $new_subnet_mask broadcast $new_broadcast_address $medium"
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$IFCONFIG $interface \
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inet $new_ip_address \
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netmask $new_subnet_mask \
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broadcast $new_broadcast_address \
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$medium
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$IFCONFIG $interface setfirst $new_ip_address
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$LOGGER "New IP Address ($interface): $new_ip_address"
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$LOGGER "New Subnet Mask ($interface): $new_subnet_mask"
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$LOGGER "New Broadcast Address ($interface): $new_broadcast_address"
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$LOGGER "New Routers ($interface): $new_routers"
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# This is necessary otherwise apinger will try to ping all 1s address
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if [ -n "$new_routers" ] && [ "$new_routers" != "255.255.255.255" ]; then
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echo $new_routers > /tmp/${interface}_router
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fi
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echo $new_ip_address > /var/db/${interface}_ip
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}
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delete_old_alias() {
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if [ -n "$alias_ip_address" ]; then
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$IFCONFIG $interface inet -alias $alias_ip_address > /dev/null 2>&1
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$ROUTE delete $alias_ip_address $LOCALHOST > /dev/null 2>&1
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fi
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}
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add_new_alias() {
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if [ -n "$alias_ip_address" ]; then
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$IFCONFIG $interface inet alias $alias_ip_address netmask \
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$alias_subnet_mask
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$ROUTE add $alias_ip_address $LOCALHOST
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fi
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}
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fill_classless_routes() {
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set $1
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while [ $# -ge 5 ]; do
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if [ $1 -eq 0 ]; then
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route="default"
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elif [ $1 -le 8 ]; then
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route="$2.0.0.0/$1"
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shift
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elif [ $1 -le 16 ]; then
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route="$2.$3.0.0/$1"
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shift; shift
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elif [ $1 -le 24 ]; then
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route="$2.$3.$4.0/$1"
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shift; shift; shift
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else
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route="$2.$3.$4.$5/$1"
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shift; shift; shift; shift
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fi
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shift
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router="$1.$2.$3.$4"
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classless_routes="$classless_routes $route $router"
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shift; shift; shift; shift
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done
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}
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delete_old_routes() {
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$LOGGER "Deleting old routes"
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if [ -n "$old_classless_routes" ]; then
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fill_classless_routes "$old_classless_routes"
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set $classless_routes
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while [ $# -gt 1 ]; do
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route delete "$1" "$2"
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shift; shift
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done
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return 0;
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fi
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# Only allow the default route to be overridden if it's on our own interface
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if [ -f "/tmp/${interface}_defaultgw" ]; then
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for router in $old_routers; do
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$ROUTE delete default $router >/dev/null 2>&1
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/bin/rm -f /tmp/${interface}_router
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done
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fi
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if [ -n "$old_static_routes" ]; then
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set $old_static_routes
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while [ $# -gt 1 ]; do
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$ROUTE delete "$1" "$2"
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shift; shift
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/bin/rm -f /tmp/${interface}_router
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done
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fi
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arp_flush
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}
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add_new_routes() {
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$LOGGER "Adding new routes to interface: $interface"
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# RFC 3442: If the DHCP server returns both a Classless Static
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# Routes option and a Router option, the DHCP client MUST ignore
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# the Router option.
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#
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# DHCP clients that support this option (Classless Static Routes)
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# MUST NOT install the routes specified in the Static Routes
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# option (option code 33) if both a Static Routes option and the
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# Classless Static Routes option are provided.
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if [ -n "$new_classless_routes" ]; then
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fill_classless_routes "$new_classless_routes"
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$LOGGER "New Classless Static Routes ($interface): $classless_routes"
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set $classless_routes
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while [ $# -gt 1 ]; do
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if [ "0.0.0.0" = "$2" ]; then
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route add "$1" -iface "$interface"
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else
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route add "$1" "$2"
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fi
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shift; shift
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done
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return
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fi
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ADDED_ROUTE=no
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EXISTSGW=`/bin/ls -l /tmp/*_defaultgw | /usr/bin/wc -l`
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# Only allow the default route to be overridden if it's on our own interface
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if [ -f "/tmp/${interface}_defaultgw" -o $EXISTSGW -eq 0 ]; then
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$ROUTE delete default
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for router in $new_routers; do
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if [ "$new_ip_address" = "$router" -o "$router" = "255.255.255.255" ]; then
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$ROUTE add default -iface $interface
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echo $ROUTE add default -iface $interface | $LOGGER
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# NOTE: Do not activate this for all ones address since pf(4) will try to forward packets to it.
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if [ "$new_ip_address" = "$router" ]; then
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echo $router > /tmp/${interface}_router
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fi
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else
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$ROUTE add default $router
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echo $ROUTE add default $router | $LOGGER
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echo $router > /tmp/${interface}_router
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fi
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ADDED_ROUTE=yes
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# 2nd and subsequent default routers error out, so explicitly
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# stop processing the list after the first one.
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break
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done
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fi
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if [ -n "$new_static_routes" ]; then
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$LOGGER "New Static Routes ($interface): $new_static_routes"
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set $new_static_routes
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while [ $# -gt 1 ]; do
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$ROUTE add $1 $2
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if [ "$ADDED_ROUTE" = "no" ]; then
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echo $2 > /tmp/${interface}_router
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fi
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shift; shift
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done
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fi
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}
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add_new_resolv_conf() {
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$LOGGER "Creating resolv.conf"
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if [ -f "/var/etc/nameserver_$interface" ]; then
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# Remove old entries
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for nameserver in `cat /var/etc/nameserver_$interface`; do
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$ROUTE delete $nameserver >/dev/null 2>&1
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done
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fi
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if [ -n "$new_domain_name_servers" ]; then
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/bin/rm -f /var/etc/nameserver_$interface
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ALLOWOVERRIDE=`/usr/bin/grep dnsallowoverride /conf/config.xml | /usr/bin/wc -l`
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for nameserver in $new_domain_name_servers; do
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# Add a route to the nameserver out the correct interface
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# so that mulitple wans work correctly with multiple dns
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# also backup the nameserver for later route removal
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if [ $ALLOWOVERRIDE -gt 0 ]; then
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echo $nameserver >>/var/etc/nameserver_$interface
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$ROUTE add $nameserver -iface $interface
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fi
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done
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echo $new_domain_name >/var/etc/searchdomain_$interface
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fi
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return 0
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}
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# Notify rc.newwanip of changes to an interface
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notify_rc_newwanip() {
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/usr/local/sbin/pfSctl -c "interface newip $interface"
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}
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#
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# Start of active code.
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#
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# Invoke the local dhcp client enter hooks, if they exist.
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if [ -f /etc/dhclient-enter-hooks ]; then
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$LOGGER "dhclient-enter-hooks"
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exit_status=0
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. /etc/dhclient-enter-hooks
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# allow the local script to abort processing of this state
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# local script must set exit_status variable to nonzero.
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if [ $exit_status -ne 0 ]; then
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exit $exit_status
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fi
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fi
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#if [ -x $ROUTE ]; then
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# if_defaultroute=`$ROUTE -n get -inet default | $GREP interface | $AWK '{print $2}'`
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#else
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# $LOGGER "if_defaultroute"
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# if_defaultroute="x"
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#fi
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$LOGGER $reason
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case $reason in
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MEDIUM)
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$IFCONFIG $interface $medium
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$IFCONFIG $interface inet -alias 0.0.0.0 $medium >/dev/null 2>&1
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/bin/sleep 1
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;;
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PREINIT)
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delete_old_alias
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$IFCONFIG $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up
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/bin/rm -f /tmp/${interface}_router
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;;
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ARPCHECK|ARPSEND)
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;;
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BOUND|RENEW|REBIND|REBOOT)
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check_hostname
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changes="no"
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if [ -n "$old_ip_address" ]; then
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if [ -n "$alias_ip_address" ] && \
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[ "$old_ip_address" != "$alias_ip_address" ]; then
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delete_old_alias
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changes="yes"
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fi
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if [ "$old_ip_address" != "$new_ip_address" ]; then
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delete_old_address
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delete_old_routes
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changes="yes"
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fi
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fi
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if [ "$reason" = BOUND ] || \
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[ "$reason" = REBOOT ] || \
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[ -z "$old_ip_address" ] || \
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[ "$old_ip_address" != "$new_ip_address" ]; then
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add_new_address
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add_new_routes
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changes="yes"
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fi
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if [ -n "$alias_ip_address" ] && \
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[ "$new_ip_address" != "$alias_ip_address" ]; then
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add_new_alias
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changes="yes"
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fi
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add_new_resolv_conf
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if [ "$changes" = "yes" ] ; then
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notify_rc_newwanip
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fi
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;;
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EXPIRE|FAIL)
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delete_old_alias
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if [ -n "$old_ip_address" ]; then
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delete_old_address
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delete_old_routes
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fi
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;;
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TIMEOUT)
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delete_old_alias
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add_new_address
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/bin/sleep 1
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if [ -n "$new_routers" ]; then
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$LOGGER "New Routers ($interface): $new_routers"
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set "$new_routers"
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if /sbin/ping -q -c 1 -t 1 "$1"; then
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if [ "$new_ip_address" != "$alias_ip_address" ]; then
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add_new_alias
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fi
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add_new_routes
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if add_new_resolv_conf; then
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notify_rc_newwanip
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fi
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fi
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fi
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$IFCONFIG $interface inet -alias $new_ip_address $medium
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delete_old_routes
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;;
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esac
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# Invoke the local dhcp client exit hooks, if they exist.
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if [ -f /etc/dhclient-exit-hooks ]; then
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$LOGGER "dhclient-exit-hooks"
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exit_status=0
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. /etc/dhclient-exit-hooks
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# allow the local script to abort processing of this state
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# local script must set exit_status variable to nonzero.
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exit $exit_status
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fi
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