dhclient-script revision 154760
1147072Sbrooks#!/bin/sh 2147072Sbrooks# 3147072Sbrooks# $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $ 4147086Sbrooks# $FreeBSD: head/sbin/dhclient/dhclient-script 154760 2006-01-24 06:11:55Z brooks $ 5147072Sbrooks# 6147072Sbrooks# Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org> 7147072Sbrooks# 8147072Sbrooks# Permission to use, copy, modify, and distribute this software for any 9147072Sbrooks# purpose with or without fee is hereby granted, provided that the above 10147072Sbrooks# copyright notice and this permission notice appear in all copies. 11147072Sbrooks# 12147072Sbrooks# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13147072Sbrooks# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14147072Sbrooks# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15147072Sbrooks# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16147072Sbrooks# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17147072Sbrooks# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18147072Sbrooks# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19147072Sbrooks# 20147072Sbrooks# 21147072Sbrooks 22154164SbrooksARP=/usr/sbin/arp 23147086SbrooksAWK=/usr/bin/awk 24147086SbrooksHOSTNAME=/bin/hostname 25154164SbrooksNETSTAT=/usr/bin/netstat 26147086Sbrooks 27147086SbrooksLOCALHOST=127.0.0.1 28147086Sbrooks 29147086Sbrooksif [ -x /usr/bin/logger ]; then 30147086Sbrooks LOGGER="/usr/bin/logger -s -p user.notice -t dhclient" 31147086Sbrookselse 32147086Sbrooks LOGGER=echo 33147086Sbrooksfi 34147086Sbrooks 35147072Sbrooks# 36147072Sbrooks# Helper functions that implement common actions. 37147072Sbrooks# 38147072Sbrooks 39147086Sbrookscheck_hostname() { 40147086Sbrooks current_hostname=`$HOSTNAME` 41147086Sbrooks if [ -z "$current_hostname" ]; then 42147086Sbrooks $LOGGER "New Hostname ($interface): $new_host_name" 43147086Sbrooks $HOSTNAME $new_host_name 44147086Sbrooks elif [ "$current_hostname" = "$old_host_name" -a \ 45147086Sbrooks "$new_host_name" != "$old_host_name" ]; then 46147086Sbrooks $LOGGER "New Hostname ($interface): $new_host_name" 47147086Sbrooks $HOSTNAME $new_host_name 48147072Sbrooks fi 49147072Sbrooks} 50147072Sbrooks 51147086Sbrooksarp_flush() { 52147086Sbrooks arp -an -i $interface | \ 53147086Sbrooks sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \ 54147086Sbrooks sh >/dev/null 2>&1 55147086Sbrooks} 56147086Sbrooks 57147086Sbrooksdelete_old_address() { 58149519Sbrooks eval "ifconfig $interface inet -alias $old_ip_address $medium" 59147086Sbrooks} 60147086Sbrooks 61147072Sbrooksadd_new_address() { 62149519Sbrooks eval "ifconfig $interface \ 63147072Sbrooks inet $new_ip_address \ 64147072Sbrooks netmask $new_subnet_mask \ 65147072Sbrooks broadcast $new_broadcast_address \ 66149519Sbrooks $medium" 67147072Sbrooks 68147086Sbrooks $LOGGER "New IP Address ($interface): $new_ip_address" 69147086Sbrooks $LOGGER "New Subnet Mask ($interface): $new_subnet_mask" 70147086Sbrooks $LOGGER "New Broadcast Address ($interface): $new_broadcast_address" 71147086Sbrooks $LOGGER "New Routers ($interface): $new_routers" 72147072Sbrooks} 73147072Sbrooks 74147072Sbrooksdelete_old_alias() { 75147072Sbrooks if [ -n "$alias_ip_address" ]; then 76147072Sbrooks ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1 77149479Sbrooks #route delete $alias_ip_address $LOCALHOST > /dev/null 2>&1 78147072Sbrooks fi 79147072Sbrooks} 80147072Sbrooks 81147072Sbrooksadd_new_alias() { 82147072Sbrooks if [ -n "$alias_ip_address" ]; then 83147072Sbrooks ifconfig $interface inet alias $alias_ip_address netmask \ 84147072Sbrooks $alias_subnet_mask 85149479Sbrooks #route add $alias_ip_address $LOCALHOST 86147072Sbrooks fi 87147072Sbrooks} 88147072Sbrooks 89147072Sbrooksdelete_old_routes() { 90149479Sbrooks #route delete "$old_ip_address" $LOCALHOST >/dev/null 2>&1 91147086Sbrooks for router in $old_routers; do 92147086Sbrooks if [ $if_defaultroute = x -o $if_defaultroute = $interface ]; then 93147086Sbrooks route delete default $route >/dev/null 2>&1 94147086Sbrooks fi 95147086Sbrooks done 96147072Sbrooks 97147072Sbrooks if [ -n "$old_static_routes" ]; then 98147072Sbrooks set $old_static_routes 99147072Sbrooks while [ $# -gt 1 ]; do 100147072Sbrooks route delete "$1" "$2" 101147072Sbrooks shift; shift 102147072Sbrooks done 103147072Sbrooks fi 104147072Sbrooks 105147086Sbrooks arp_flush 106147072Sbrooks} 107147072Sbrooks 108147072Sbrooksadd_new_routes() { 109149479Sbrooks #route add $new_ip_address $LOCALHOST >/dev/null 2>&1 110147072Sbrooks for router in $new_routers; do 111147072Sbrooks if [ "$new_ip_address" = "$router" ]; then 112147072Sbrooks route add default -iface $router >/dev/null 2>&1 113147072Sbrooks else 114147072Sbrooks route add default $router >/dev/null 2>&1 115147072Sbrooks fi 116147072Sbrooks # 2nd and subsequent default routers error out, so explicitly 117147072Sbrooks # stop processing the list after the first one. 118147072Sbrooks break 119147072Sbrooks done 120147072Sbrooks 121147072Sbrooks if [ -n "$new_static_routes" ]; then 122147086Sbrooks $LOGGER "New Static Routes ($interface): $new_static_routes" 123147072Sbrooks set $new_static_routes 124147072Sbrooks while [ $# -gt 1 ]; do 125147072Sbrooks route add $1 $2 126147072Sbrooks shift; shift 127147072Sbrooks done 128147072Sbrooks fi 129147072Sbrooks} 130147072Sbrooks 131147072Sbrooksadd_new_resolv_conf() { 132147072Sbrooks # XXX Old code did not create/update resolv.conf unless both 133147072Sbrooks # $new_domain_name and $new_domain_name_servers were provided. PR 134147072Sbrooks # #3135 reported some ISP's only provide $new_domain_name_servers and 135147072Sbrooks # thus broke the script. This code creates the resolv.conf if either 136147072Sbrooks # are provided. 137147072Sbrooks 138154702Swes local tmpres=${TMPDIR:-/tmp}/resolv.conf.std 139154702Swes rm -f $tmpres 140147072Sbrooks 141147072Sbrooks if [ -n "$new_domain_name" ]; then 142154702Swes echo "search $new_domain_name" >>$tmpres 143147072Sbrooks fi 144147072Sbrooks 145147072Sbrooks if [ -n "$new_domain_name_servers" ]; then 146147072Sbrooks for nameserver in $new_domain_name_servers; do 147154702Swes echo "nameserver $nameserver" >>$tmpres 148147072Sbrooks done 149147072Sbrooks fi 150147072Sbrooks 151154702Swes if [ -f $tmpres ]; then 152147072Sbrooks if [ -f /etc/resolv.conf.tail ]; then 153154702Swes cat /etc/resolv.conf.tail >>$tmpres 154147072Sbrooks fi 155147072Sbrooks 156149898Sbrooks # When resolv.conf is not changed actually, we don't 157149898Sbrooks # need to update it. 158149898Sbrooks # If /usr is not mounted yet, we cannot use cmp, then 159149898Sbrooks # the following test fails. In such case, we simply 160149898Sbrooks # ignore an error and do update resolv.conf. 161154702Swes if cmp -s $tmpres /etc/resolv.conf; then 162154702Swes rm -f $tmpres 163149898Sbrooks return 0 164149898Sbrooks fi 2>/dev/null 165149898Sbrooks 166147072Sbrooks # In case (e.g. during OpenBSD installs) /etc/resolv.conf 167147072Sbrooks # is a symbolic link, take care to preserve the link and write 168147072Sbrooks # the new data in the correct location. 169147072Sbrooks 170147072Sbrooks if [ -f /etc/resolv.conf ]; then 171147072Sbrooks cat /etc/resolv.conf > /etc/resolv.conf.save 172147072Sbrooks fi 173154702Swes cat $tmpres > /etc/resolv.conf 174154702Swes rm -f $tmpres 175147072Sbrooks 176147072Sbrooks # Try to ensure correct ownership and permissions. 177147072Sbrooks chown -RL root:wheel /etc/resolv.conf 178147072Sbrooks chmod -RL 644 /etc/resolv.conf 179147072Sbrooks 180147072Sbrooks return 0 181147072Sbrooks fi 182147072Sbrooks 183147072Sbrooks return 1 184147072Sbrooks} 185147072Sbrooks 186147138Sbrooks# Must be used on exit. Invokes the local dhcp client exit hooks, if any. 187147138Sbrooksexit_with_hooks() { 188147138Sbrooks exit_status=$1 189147138Sbrooks if [ -f /etc/dhclient-exit-hooks ]; then 190147138Sbrooks . /etc/dhclient-exit-hooks 191147138Sbrooks fi 192147138Sbrooks # probably should do something with exit status of the local script 193147138Sbrooks exit $exit_status 194147138Sbrooks} 195147138Sbrooks 196147072Sbrooks# 197147072Sbrooks# Start of active code. 198147072Sbrooks# 199147072Sbrooks 200147218Sbrooks# Invoke the local dhcp client enter hooks, if they exist. 201147218Sbrooksif [ -f /etc/dhclient-enter-hooks ]; then 202147218Sbrooks exit_status=0 203147218Sbrooks . /etc/dhclient-enter-hooks 204147218Sbrooks # allow the local script to abort processing of this state 205147218Sbrooks # local script must set exit_status variable to nonzero. 206147218Sbrooks if [ $exit_status -ne 0 ]; then 207147218Sbrooks exit $exit_status 208147218Sbrooks fi 209147218Sbrooksfi 210147218Sbrooks 211147086Sbrooksif [ -x $NETSTAT ]; then 212149480Sbrooks if_defaultroute=`$NETSTAT -rnf inet | $AWK '{if ($1=="default") printf $6}'` 213147086Sbrookselse 214147086Sbrooks if_defaultroute="x" 215147072Sbrooksfi 216147072Sbrooks 217147072Sbrookscase $reason in 218147072SbrooksMEDIUM) 219149519Sbrooks eval "ifconfig $interface $medium" 220149519Sbrooks eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1 221147072Sbrooks sleep 1 222147072Sbrooks ;; 223147072Sbrooks 224147072SbrooksPREINIT) 225147072Sbrooks delete_old_alias 226147072Sbrooks ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up 227147072Sbrooks ;; 228147072Sbrooks 229147072SbrooksARPCHECK|ARPSEND) 230147072Sbrooks ;; 231147072Sbrooks 232147072SbrooksBOUND|RENEW|REBIND|REBOOT) 233147086Sbrooks check_hostname 234147072Sbrooks if [ -n "$old_ip_address" ]; then 235147072Sbrooks if [ "$old_ip_address" != "$alias_ip_address" ]; then 236147072Sbrooks delete_old_alias 237147072Sbrooks fi 238147072Sbrooks if [ "$old_ip_address" != "$new_ip_address" ]; then 239147072Sbrooks delete_old_address 240147072Sbrooks delete_old_routes 241147072Sbrooks fi 242147072Sbrooks fi 243147072Sbrooks if [ "$reason" = BOUND ] || \ 244147072Sbrooks [ "$reason" = REBOOT ] || \ 245147072Sbrooks [ -z "$old_ip_address" ] || \ 246147072Sbrooks [ "$old_ip_address" != "$new_ip_address" ]; then 247147072Sbrooks add_new_address 248147072Sbrooks add_new_routes 249147072Sbrooks fi 250147072Sbrooks if [ "$new_ip_address" != "$alias_ip_address" ]; then 251147072Sbrooks add_new_alias 252147072Sbrooks fi 253147072Sbrooks add_new_resolv_conf 254147072Sbrooks ;; 255147072Sbrooks 256147072SbrooksEXPIRE|FAIL) 257147072Sbrooks delete_old_alias 258147072Sbrooks if [ -n "$old_ip_address" ]; then 259147072Sbrooks delete_old_address 260147072Sbrooks delete_old_routes 261147072Sbrooks fi 262154164Sbrooks if [ -x $ARP ]; then 263154164Sbrooks $ARP -d -a -i $interface 264154164Sbrooks fi 265147072Sbrooks # XXX Why add alias we just deleted above? 266147072Sbrooks add_new_alias 267147072Sbrooks if [ -f /etc/resolv.conf.save ]; then 268147072Sbrooks cat /etc/resolv.conf.save > /etc/resolv.conf 269147072Sbrooks fi 270147072Sbrooks ;; 271147072Sbrooks 272147072SbrooksTIMEOUT) 273147072Sbrooks delete_old_alias 274147072Sbrooks add_new_address 275147072Sbrooks sleep 1 276147072Sbrooks if [ -n "$new_routers" ]; then 277147086Sbrooks $LOGGER "New Routers ($interface): $new_routers" 278147072Sbrooks set "$new_routers" 279154760Sbrooks if ping -q -c 1 -t 1 "$1"; then 280147072Sbrooks if [ "$new_ip_address" != "$alias_ip_address" ]; then 281147072Sbrooks add_new_alias 282147072Sbrooks fi 283147072Sbrooks add_new_routes 284147072Sbrooks if add_new_resolv_conf; then 285147138Sbrooks exit_with_hooks 0 286147072Sbrooks fi 287147072Sbrooks fi 288147072Sbrooks fi 289149519Sbrooks eval "ifconfig $interface inet -alias $new_ip_address $medium" 290147072Sbrooks delete_old_routes 291147138Sbrooks exit_with_hooks 1 292147072Sbrooks ;; 293147072Sbrooksesac 294147072Sbrooks 295147138Sbrooksexit_with_hooks 0 296