dhclient-script revision 171187
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 171187 2007-07-03 17:49:32Z thompsa $ 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 25171187SthompsaIFCONFIG='/sbin/ifconfig -n' 26154164SbrooksNETSTAT=/usr/bin/netstat 27147086Sbrooks 28147086SbrooksLOCALHOST=127.0.0.1 29147086Sbrooks 30147086Sbrooksif [ -x /usr/bin/logger ]; then 31147086Sbrooks LOGGER="/usr/bin/logger -s -p user.notice -t dhclient" 32147086Sbrookselse 33147086Sbrooks LOGGER=echo 34147086Sbrooksfi 35147086Sbrooks 36147072Sbrooks# 37147072Sbrooks# Helper functions that implement common actions. 38147072Sbrooks# 39147072Sbrooks 40147086Sbrookscheck_hostname() { 41147086Sbrooks current_hostname=`$HOSTNAME` 42147086Sbrooks if [ -z "$current_hostname" ]; then 43147086Sbrooks $LOGGER "New Hostname ($interface): $new_host_name" 44147086Sbrooks $HOSTNAME $new_host_name 45147086Sbrooks elif [ "$current_hostname" = "$old_host_name" -a \ 46147086Sbrooks "$new_host_name" != "$old_host_name" ]; then 47147086Sbrooks $LOGGER "New Hostname ($interface): $new_host_name" 48147086Sbrooks $HOSTNAME $new_host_name 49147072Sbrooks fi 50147072Sbrooks} 51147072Sbrooks 52147086Sbrooksarp_flush() { 53147086Sbrooks arp -an -i $interface | \ 54147086Sbrooks sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \ 55147086Sbrooks sh >/dev/null 2>&1 56147086Sbrooks} 57147086Sbrooks 58147086Sbrooksdelete_old_address() { 59171187Sthompsa eval "$IFCONFIG $interface inet -alias $old_ip_address $medium" 60147086Sbrooks} 61147086Sbrooks 62147072Sbrooksadd_new_address() { 63171187Sthompsa eval "$IFCONFIG $interface \ 64147072Sbrooks inet $new_ip_address \ 65147072Sbrooks netmask $new_subnet_mask \ 66147072Sbrooks broadcast $new_broadcast_address \ 67149519Sbrooks $medium" 68147072Sbrooks 69147086Sbrooks $LOGGER "New IP Address ($interface): $new_ip_address" 70147086Sbrooks $LOGGER "New Subnet Mask ($interface): $new_subnet_mask" 71147086Sbrooks $LOGGER "New Broadcast Address ($interface): $new_broadcast_address" 72147086Sbrooks $LOGGER "New Routers ($interface): $new_routers" 73147072Sbrooks} 74147072Sbrooks 75147072Sbrooksdelete_old_alias() { 76147072Sbrooks if [ -n "$alias_ip_address" ]; then 77171187Sthompsa $IFCONFIG $interface inet -alias $alias_ip_address > /dev/null 2>&1 78149479Sbrooks #route delete $alias_ip_address $LOCALHOST > /dev/null 2>&1 79147072Sbrooks fi 80147072Sbrooks} 81147072Sbrooks 82147072Sbrooksadd_new_alias() { 83147072Sbrooks if [ -n "$alias_ip_address" ]; then 84171187Sthompsa $IFCONFIG $interface inet alias $alias_ip_address netmask \ 85147072Sbrooks $alias_subnet_mask 86149479Sbrooks #route add $alias_ip_address $LOCALHOST 87147072Sbrooks fi 88147072Sbrooks} 89147072Sbrooks 90166602Semastefill_classless_routes() { 91166602Semaste set $1 92168689Semaste while [ $# -ge 5 ]; do 93166602Semaste if [ $1 -eq 0 ]; then 94166602Semaste route="default" 95166602Semaste elif [ $1 -le 8 ]; then 96166602Semaste route="$2.0.0.0/$1" 97166602Semaste shift 98166602Semaste elif [ $1 -le 16 ]; then 99166602Semaste route="$2.$3.0.0/$1" 100166602Semaste shift; shift 101166602Semaste elif [ $1 -le 24 ]; then 102166602Semaste route="$2.$3.$4.0/$1" 103166602Semaste shift; shift; shift 104166602Semaste else 105166602Semaste route="$2.$3.$4.$5/$1" 106166602Semaste shift; shift; shift; shift 107166602Semaste fi 108166602Semaste shift 109166602Semaste router="$1.$2.$3.$4" 110166602Semaste classless_routes="$classless_routes $route $router" 111166602Semaste shift; shift; shift; shift 112166602Semaste done 113166602Semaste} 114166602Semaste 115147072Sbrooksdelete_old_routes() { 116149479Sbrooks #route delete "$old_ip_address" $LOCALHOST >/dev/null 2>&1 117166602Semaste if [ -n "$old_classless_routes" ]; then 118166602Semaste fill_classless_routes "$old_classless_routes" 119166602Semaste set $classless_routes 120166602Semaste while [ $# -gt 1 ]; do 121166602Semaste route delete "$1" "$2" 122166602Semaste shift; shift 123166602Semaste done 124166602Semaste return 0; 125166602Semaste fi 126166602Semaste 127147086Sbrooks for router in $old_routers; do 128147086Sbrooks if [ $if_defaultroute = x -o $if_defaultroute = $interface ]; then 129147086Sbrooks route delete default $route >/dev/null 2>&1 130147086Sbrooks fi 131147086Sbrooks done 132147072Sbrooks 133147072Sbrooks if [ -n "$old_static_routes" ]; then 134147072Sbrooks set $old_static_routes 135147072Sbrooks while [ $# -gt 1 ]; do 136147072Sbrooks route delete "$1" "$2" 137147072Sbrooks shift; shift 138147072Sbrooks done 139147072Sbrooks fi 140147072Sbrooks 141147086Sbrooks arp_flush 142147072Sbrooks} 143147072Sbrooks 144147072Sbrooksadd_new_routes() { 145149479Sbrooks #route add $new_ip_address $LOCALHOST >/dev/null 2>&1 146166602Semaste 147166602Semaste # RFC 3442: If the DHCP server returns both a Classless Static 148166602Semaste # Routes option and a Router option, the DHCP client MUST ignore 149166602Semaste # the Router option. 150166602Semaste # 151166602Semaste # DHCP clients that support this option (Classless Static Routes) 152166602Semaste # MUST NOT install the routes specified in the Static Routes 153166602Semaste # option (option code 33) if both a Static Routes option and the 154166602Semaste # Classless Static Routes option are provided. 155166602Semaste 156166602Semaste if [ -n "$new_classless_routes" ]; then 157166602Semaste fill_classless_routes "$new_classless_routes" 158166602Semaste $LOGGER "New Classless Static Routes ($interface): $classless_routes" 159166602Semaste set $classless_routes 160166602Semaste while [ $# -gt 1 ]; do 161166602Semaste if [ "0.0.0.0" = "$2" ]; then 162166602Semaste route add "$1" -iface "$interface" 163166602Semaste else 164166602Semaste route add "$1" "$2" 165166602Semaste fi 166166602Semaste shift; shift 167166602Semaste done 168166602Semaste return 169166602Semaste fi 170166602Semaste 171147072Sbrooks for router in $new_routers; do 172147072Sbrooks if [ "$new_ip_address" = "$router" ]; then 173147072Sbrooks route add default -iface $router >/dev/null 2>&1 174147072Sbrooks else 175147072Sbrooks route add default $router >/dev/null 2>&1 176147072Sbrooks fi 177147072Sbrooks # 2nd and subsequent default routers error out, so explicitly 178147072Sbrooks # stop processing the list after the first one. 179147072Sbrooks break 180147072Sbrooks done 181147072Sbrooks 182147072Sbrooks if [ -n "$new_static_routes" ]; then 183147086Sbrooks $LOGGER "New Static Routes ($interface): $new_static_routes" 184147072Sbrooks set $new_static_routes 185147072Sbrooks while [ $# -gt 1 ]; do 186147072Sbrooks route add $1 $2 187147072Sbrooks shift; shift 188147072Sbrooks done 189147072Sbrooks fi 190147072Sbrooks} 191147072Sbrooks 192147072Sbrooksadd_new_resolv_conf() { 193147072Sbrooks # XXX Old code did not create/update resolv.conf unless both 194147072Sbrooks # $new_domain_name and $new_domain_name_servers were provided. PR 195147072Sbrooks # #3135 reported some ISP's only provide $new_domain_name_servers and 196147072Sbrooks # thus broke the script. This code creates the resolv.conf if either 197147072Sbrooks # are provided. 198147072Sbrooks 199154869Sbrooks local tmpres=/var/run/resolv.conf.${interface} 200154702Swes rm -f $tmpres 201147072Sbrooks 202147072Sbrooks if [ -n "$new_domain_name" ]; then 203154702Swes echo "search $new_domain_name" >>$tmpres 204147072Sbrooks fi 205147072Sbrooks 206147072Sbrooks if [ -n "$new_domain_name_servers" ]; then 207147072Sbrooks for nameserver in $new_domain_name_servers; do 208154702Swes echo "nameserver $nameserver" >>$tmpres 209147072Sbrooks done 210147072Sbrooks fi 211147072Sbrooks 212154702Swes if [ -f $tmpres ]; then 213147072Sbrooks if [ -f /etc/resolv.conf.tail ]; then 214154702Swes cat /etc/resolv.conf.tail >>$tmpres 215147072Sbrooks fi 216147072Sbrooks 217149898Sbrooks # When resolv.conf is not changed actually, we don't 218149898Sbrooks # need to update it. 219149898Sbrooks # If /usr is not mounted yet, we cannot use cmp, then 220149898Sbrooks # the following test fails. In such case, we simply 221149898Sbrooks # ignore an error and do update resolv.conf. 222154702Swes if cmp -s $tmpres /etc/resolv.conf; then 223154702Swes rm -f $tmpres 224149898Sbrooks return 0 225149898Sbrooks fi 2>/dev/null 226149898Sbrooks 227147072Sbrooks # In case (e.g. during OpenBSD installs) /etc/resolv.conf 228147072Sbrooks # is a symbolic link, take care to preserve the link and write 229147072Sbrooks # the new data in the correct location. 230147072Sbrooks 231147072Sbrooks if [ -f /etc/resolv.conf ]; then 232147072Sbrooks cat /etc/resolv.conf > /etc/resolv.conf.save 233147072Sbrooks fi 234154702Swes cat $tmpres > /etc/resolv.conf 235154702Swes rm -f $tmpres 236147072Sbrooks 237147072Sbrooks # Try to ensure correct ownership and permissions. 238147072Sbrooks chown -RL root:wheel /etc/resolv.conf 239147072Sbrooks chmod -RL 644 /etc/resolv.conf 240147072Sbrooks 241147072Sbrooks return 0 242147072Sbrooks fi 243147072Sbrooks 244147072Sbrooks return 1 245147072Sbrooks} 246147072Sbrooks 247147138Sbrooks# Must be used on exit. Invokes the local dhcp client exit hooks, if any. 248147138Sbrooksexit_with_hooks() { 249147138Sbrooks exit_status=$1 250147138Sbrooks if [ -f /etc/dhclient-exit-hooks ]; then 251147138Sbrooks . /etc/dhclient-exit-hooks 252147138Sbrooks fi 253147138Sbrooks # probably should do something with exit status of the local script 254147138Sbrooks exit $exit_status 255147138Sbrooks} 256147138Sbrooks 257147072Sbrooks# 258147072Sbrooks# Start of active code. 259147072Sbrooks# 260147072Sbrooks 261147218Sbrooks# Invoke the local dhcp client enter hooks, if they exist. 262147218Sbrooksif [ -f /etc/dhclient-enter-hooks ]; then 263147218Sbrooks exit_status=0 264147218Sbrooks . /etc/dhclient-enter-hooks 265147218Sbrooks # allow the local script to abort processing of this state 266147218Sbrooks # local script must set exit_status variable to nonzero. 267147218Sbrooks if [ $exit_status -ne 0 ]; then 268147218Sbrooks exit $exit_status 269147218Sbrooks fi 270147218Sbrooksfi 271147218Sbrooks 272147086Sbrooksif [ -x $NETSTAT ]; then 273149480Sbrooks if_defaultroute=`$NETSTAT -rnf inet | $AWK '{if ($1=="default") printf $6}'` 274147086Sbrookselse 275147086Sbrooks if_defaultroute="x" 276147072Sbrooksfi 277147072Sbrooks 278147072Sbrookscase $reason in 279147072SbrooksMEDIUM) 280171187Sthompsa eval "$IFCONFIG $interface $medium" 281171187Sthompsa eval "$IFCONFIG $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1 282147072Sbrooks sleep 1 283147072Sbrooks ;; 284147072Sbrooks 285147072SbrooksPREINIT) 286147072Sbrooks delete_old_alias 287171187Sthompsa $IFCONFIG $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up 288147072Sbrooks ;; 289147072Sbrooks 290147072SbrooksARPCHECK|ARPSEND) 291147072Sbrooks ;; 292147072Sbrooks 293147072SbrooksBOUND|RENEW|REBIND|REBOOT) 294147086Sbrooks check_hostname 295147072Sbrooks if [ -n "$old_ip_address" ]; then 296147072Sbrooks if [ "$old_ip_address" != "$alias_ip_address" ]; then 297147072Sbrooks delete_old_alias 298147072Sbrooks fi 299147072Sbrooks if [ "$old_ip_address" != "$new_ip_address" ]; then 300147072Sbrooks delete_old_address 301147072Sbrooks delete_old_routes 302147072Sbrooks fi 303147072Sbrooks fi 304147072Sbrooks if [ "$reason" = BOUND ] || \ 305147072Sbrooks [ "$reason" = REBOOT ] || \ 306147072Sbrooks [ -z "$old_ip_address" ] || \ 307147072Sbrooks [ "$old_ip_address" != "$new_ip_address" ]; then 308147072Sbrooks add_new_address 309147072Sbrooks add_new_routes 310147072Sbrooks fi 311147072Sbrooks if [ "$new_ip_address" != "$alias_ip_address" ]; then 312147072Sbrooks add_new_alias 313147072Sbrooks fi 314147072Sbrooks add_new_resolv_conf 315147072Sbrooks ;; 316147072Sbrooks 317147072SbrooksEXPIRE|FAIL) 318147072Sbrooks delete_old_alias 319147072Sbrooks if [ -n "$old_ip_address" ]; then 320147072Sbrooks delete_old_address 321147072Sbrooks delete_old_routes 322147072Sbrooks fi 323154164Sbrooks if [ -x $ARP ]; then 324154164Sbrooks $ARP -d -a -i $interface 325154164Sbrooks fi 326147072Sbrooks # XXX Why add alias we just deleted above? 327147072Sbrooks add_new_alias 328147072Sbrooks if [ -f /etc/resolv.conf.save ]; then 329147072Sbrooks cat /etc/resolv.conf.save > /etc/resolv.conf 330147072Sbrooks fi 331147072Sbrooks ;; 332147072Sbrooks 333147072SbrooksTIMEOUT) 334147072Sbrooks delete_old_alias 335147072Sbrooks add_new_address 336147072Sbrooks sleep 1 337147072Sbrooks if [ -n "$new_routers" ]; then 338147086Sbrooks $LOGGER "New Routers ($interface): $new_routers" 339147072Sbrooks set "$new_routers" 340154760Sbrooks if ping -q -c 1 -t 1 "$1"; then 341147072Sbrooks if [ "$new_ip_address" != "$alias_ip_address" ]; then 342147072Sbrooks add_new_alias 343147072Sbrooks fi 344147072Sbrooks add_new_routes 345147072Sbrooks if add_new_resolv_conf; then 346147138Sbrooks exit_with_hooks 0 347147072Sbrooks fi 348147072Sbrooks fi 349147072Sbrooks fi 350171187Sthompsa eval "$IFCONFIG $interface inet -alias $new_ip_address $medium" 351147072Sbrooks delete_old_routes 352147138Sbrooks exit_with_hooks 1 353147072Sbrooks ;; 354147072Sbrooksesac 355147072Sbrooks 356147138Sbrooksexit_with_hooks 0 357