SecBSD's official ports repository
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net/isc-dhcp/files/dhclient-script
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net/isc-dhcp/files/dhclient-script
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#!/bin/sh
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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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#
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# Helper functions that implement common actions.
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#
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delete_old_address() {
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if [ -n "$old_ip_address" ]; then
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ifconfig $interface inet $old_ip_address delete
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route -q $rdomain delete "$old_ip_address" 127.0.0.1
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fi
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}
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ip6_delete_old_address() {
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if [ -n "$old_ip6_address" ]; then
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ifconfig $interface inet6 $old_ip6_address delete
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fi
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}
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add_new_address() {
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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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# XXX Original TIMEOUT code did not do this unless $new_routers was set?
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route -q $rdomain add $new_ip_address 127.0.0.1
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}
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ip6_add_new_address() {
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ifconfig $interface \
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inet6 $new_ip6_address \
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prefixlen $new_ip6_prefixlen
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}
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delete_old_routes() {
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# Delete existing default route. We only allow one, so no need to
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# process $old_routers list.
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route -q $rdomain -n flush -inet -iface $interface
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arp -dan
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}
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add_new_routes() {
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route -q $rdomain -n flush -inet -iface $interface
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for router in $new_routers; do
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if [ "$new_ip_address" = "$router" ]; then
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route -q $rdomain add default -iface $router
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else
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route -q $rdomain add default $router
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fi
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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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}
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add_new_resolv_conf() {
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# Create resolv.conf when either $new_domain_name_servers or
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# $new_domain_name are provided. As reported in PR#3135, some ISPs
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# provide only $new_domain_name_servers.
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rm -f /etc/resolv.conf.std
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if [ -n "$new_domain_name" ]; then
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echo "search $new_domain_name" >>/etc/resolv.conf.std
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fi
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if [ -n "$new_domain_name_servers" ]; then
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for nameserver in $new_domain_name_servers; do
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echo "nameserver $nameserver" >>/etc/resolv.conf.std
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done
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fi
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if [ -f /etc/resolv.conf.std ]; then
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if [ -f /etc/resolv.conf.tail ]; then
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cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
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fi
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# In case (e.g. during OpenBSD installs) /etc/resolv.conf
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# is a symbolic link, take care to preserve the link and write
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# the new data in the correct location.
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if [ -f /etc/resolv.conf ]; then
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cat /etc/resolv.conf > /etc/resolv.conf.save
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fi
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cat /etc/resolv.conf.std > /etc/resolv.conf
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rm -f /etc/resolv.conf.std
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# Try to ensure correct ownership and permissions.
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chown -RL root:wheel /etc/resolv.conf
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chmod -RL 644 /etc/resolv.conf
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return 0
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fi
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return 1
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}
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ip6_add_new_resolv_conf() {
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# Create resolv.conf when either $new_dhcp6_name_servers or
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# $new_dhcp6_domain_search are provided.
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rm -f /etc/resolv.conf.std6
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if [ -n "$new_dhcp6_domain_search" ]; then
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echo "search $new_dhcp6_domain_search" >>/etc/resolv.conf.std6
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fi
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if [ -n "$new_dhcp6_name_servers" ]; then
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for nameserver in $new_dhcp6_name_servers; do
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echo "nameserver $nameserver" >>/etc/resolv.conf.std6
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done
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fi
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if [ -f /etc/resolv.conf.std6 ]; then
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if [ -f /etc/resolv.conf.tail ]; then
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cat /etc/resolv.conf.tail >>/etc/resolv.conf.std6
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fi
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# In case (e.g. during OpenBSD installs) /etc/resolv.conf
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# is a symbolic link, take care to preserve the link and write
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# the new data in the correct location.
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if [ -f /etc/resolv.conf ]; then
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cat /etc/resolv.conf > /etc/resolv.conf.save
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fi
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cat /etc/resolv.conf.std6 > /etc/resolv.conf
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rm -f /etc/resolv.conf.std6
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# Try to ensure correct ownership and permissions.
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chown -RL root:wheel /etc/resolv.conf
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chmod -RL 644 /etc/resolv.conf
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return 0
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fi
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return 1
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}
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#
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# Start of active code.
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#
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case $reason in
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MEDIUM)
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# Not called by OpenBSD dhclient(8).
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;;
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PREINIT)
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# Not called by OpenBSD dhclient(8).
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;;
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PREINIT6)
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# Not called by OpenBSD dhclient(8).
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;;
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ARPSEND)
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# Not called by OpenBSD dhclient(8).
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# Always fail. i.e. don't wait for ARP packet here.
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exit 1
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;;
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ARPCHECK)
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# Not called by OpenBSD dhclient(8).
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# Always succeed. i.e. accept lease.
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;;
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BOUND|RENEW|REBIND|REBOOT)
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if [ -n "$old_ip_address" ]; then
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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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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" != "$new_ip_address" ]; then
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add_new_address
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add_new_routes
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fi
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add_new_resolv_conf
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;;
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BOUND6|RENEW6|REBIND6)
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if [ -n "$old_ip6_address" ]; then
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if [ "$old_ip6_address" != "$new_ip6_address" ]; then
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ip6_delete_old_address
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fi
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fi
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if [ "$reason" = BOUND6 ] ||
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[ -z "$old_ip6_address" ] ||
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[ "$old_ip6_address" != "$new_ip6_address" ]; then
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ip6_add_new_address
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fi
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ip6_add_new_resolv_conf
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;;
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EXPIRE|FAIL)
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if [ -n "$old_ip_address" ]; then
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delete_old_address
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delete_old_routes
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fi
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if [ -f /etc/resolv.conf.save ]; then
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cat /etc/resolv.conf.save > /etc/resolv.conf
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rm -f /etc/resolv.conf.save
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fi
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;;
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EXPIRE6|RELEASE6|STOP6)
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if [ -n "$old_ip6_address" ]; then
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ip6_delete_old_address
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fi
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if [ -f /etc/resolv.conf.save ]; then
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cat /etc/resolv.conf.save > /etc/resolv.conf
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rm -f /etc/resolv.conf.save
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fi
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;;
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TIMEOUT)
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add_new_address
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sleep 1
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if [ -n "$new_routers" ]; then
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set "$new_routers"
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if ping -q -c 1 -w 1 "$1"; then
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add_new_routes
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if add_new_resolv_conf; then
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exit 0
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fi
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fi
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fi
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ifconfig $interface inet $new_ip_address delete
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# XXX Why not a delete_old_address as before all other invocations of
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# delete_old_routes?
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delete_old_routes
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exit 1
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;;
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esac
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exit 0
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