dhclient-script revision 229583
1147072Sbrooks#!/bin/sh 2147072Sbrooks# 3147072Sbrooks# $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $ 4147086Sbrooks# $FreeBSD: stable/9/sbin/dhclient/dhclient-script 229583 2012-01-05 11:14:28Z glebius $ 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 23147086SbrooksHOSTNAME=/bin/hostname 24171187SthompsaIFCONFIG='/sbin/ifconfig -n' 25147086Sbrooks 26147086SbrooksLOCALHOST=127.0.0.1 27147086Sbrooks 28147086Sbrooksif [ -x /usr/bin/logger ]; then 29147086Sbrooks LOGGER="/usr/bin/logger -s -p user.notice -t dhclient" 30147086Sbrookselse 31147086Sbrooks LOGGER=echo 32147086Sbrooksfi 33147086Sbrooks 34147072Sbrooks# 35147072Sbrooks# Helper functions that implement common actions. 36147072Sbrooks# 37147072Sbrooks 38147086Sbrookscheck_hostname() { 39147086Sbrooks current_hostname=`$HOSTNAME` 40147086Sbrooks if [ -z "$current_hostname" ]; then 41147086Sbrooks $LOGGER "New Hostname ($interface): $new_host_name" 42147086Sbrooks $HOSTNAME $new_host_name 43147086Sbrooks elif [ "$current_hostname" = "$old_host_name" -a \ 44147086Sbrooks "$new_host_name" != "$old_host_name" ]; then 45147086Sbrooks $LOGGER "New Hostname ($interface): $new_host_name" 46147086Sbrooks $HOSTNAME $new_host_name 47147072Sbrooks fi 48147072Sbrooks} 49147072Sbrooks 50147086Sbrooksarp_flush() { 51147086Sbrooks arp -an -i $interface | \ 52147086Sbrooks sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \ 53147086Sbrooks sh >/dev/null 2>&1 54147086Sbrooks} 55147086Sbrooks 56147086Sbrooksdelete_old_address() { 57171187Sthompsa eval "$IFCONFIG $interface inet -alias $old_ip_address $medium" 58147086Sbrooks} 59147086Sbrooks 60147072Sbrooksadd_new_address() { 61171187Sthompsa eval "$IFCONFIG $interface \ 62147072Sbrooks inet $new_ip_address \ 63147072Sbrooks netmask $new_subnet_mask \ 64147072Sbrooks broadcast $new_broadcast_address \ 65149519Sbrooks $medium" 66147072Sbrooks 67147086Sbrooks $LOGGER "New IP Address ($interface): $new_ip_address" 68147086Sbrooks $LOGGER "New Subnet Mask ($interface): $new_subnet_mask" 69147086Sbrooks $LOGGER "New Broadcast Address ($interface): $new_broadcast_address" 70147086Sbrooks $LOGGER "New Routers ($interface): $new_routers" 71147072Sbrooks} 72147072Sbrooks 73147072Sbrooksdelete_old_alias() { 74147072Sbrooks if [ -n "$alias_ip_address" ]; then 75171187Sthompsa $IFCONFIG $interface inet -alias $alias_ip_address > /dev/null 2>&1 76149479Sbrooks #route delete $alias_ip_address $LOCALHOST > /dev/null 2>&1 77147072Sbrooks fi 78147072Sbrooks} 79147072Sbrooks 80147072Sbrooksadd_new_alias() { 81147072Sbrooks if [ -n "$alias_ip_address" ]; then 82171187Sthompsa $IFCONFIG $interface inet alias $alias_ip_address netmask \ 83147072Sbrooks $alias_subnet_mask 84149479Sbrooks #route add $alias_ip_address $LOCALHOST 85147072Sbrooks fi 86147072Sbrooks} 87147072Sbrooks 88166602Semastefill_classless_routes() { 89166602Semaste set $1 90168689Semaste while [ $# -ge 5 ]; do 91166602Semaste if [ $1 -eq 0 ]; then 92166602Semaste route="default" 93166602Semaste elif [ $1 -le 8 ]; then 94166602Semaste route="$2.0.0.0/$1" 95166602Semaste shift 96166602Semaste elif [ $1 -le 16 ]; then 97166602Semaste route="$2.$3.0.0/$1" 98166602Semaste shift; shift 99166602Semaste elif [ $1 -le 24 ]; then 100166602Semaste route="$2.$3.$4.0/$1" 101166602Semaste shift; shift; shift 102166602Semaste else 103166602Semaste route="$2.$3.$4.$5/$1" 104166602Semaste shift; shift; shift; shift 105166602Semaste fi 106166602Semaste shift 107166602Semaste router="$1.$2.$3.$4" 108166602Semaste classless_routes="$classless_routes $route $router" 109166602Semaste shift; shift; shift; shift 110166602Semaste done 111166602Semaste} 112166602Semaste 113147072Sbrooksdelete_old_routes() { 114149479Sbrooks #route delete "$old_ip_address" $LOCALHOST >/dev/null 2>&1 115166602Semaste if [ -n "$old_classless_routes" ]; then 116166602Semaste fill_classless_routes "$old_classless_routes" 117166602Semaste set $classless_routes 118166602Semaste while [ $# -gt 1 ]; do 119166602Semaste route delete "$1" "$2" 120166602Semaste shift; shift 121166602Semaste done 122166602Semaste return 0; 123166602Semaste fi 124166602Semaste 125177730Sbrooks # If we supported multiple default routes, we'd be removing each 126177730Sbrooks # one here. We don't so just delete the default route if it's 127177730Sbrooks # through our interface. 128177730Sbrooks if is_default_interface; then 129177730Sbrooks route delete default >/dev/null 2>&1 130177730Sbrooks fi 131147072Sbrooks 132147072Sbrooks if [ -n "$old_static_routes" ]; then 133147072Sbrooks set $old_static_routes 134147072Sbrooks while [ $# -gt 1 ]; do 135147072Sbrooks route delete "$1" "$2" 136147072Sbrooks shift; shift 137147072Sbrooks done 138147072Sbrooks fi 139147072Sbrooks 140147086Sbrooks arp_flush 141147072Sbrooks} 142147072Sbrooks 143147072Sbrooksadd_new_routes() { 144149479Sbrooks #route add $new_ip_address $LOCALHOST >/dev/null 2>&1 145166602Semaste 146166602Semaste # RFC 3442: If the DHCP server returns both a Classless Static 147166602Semaste # Routes option and a Router option, the DHCP client MUST ignore 148166602Semaste # the Router option. 149166602Semaste # 150166602Semaste # DHCP clients that support this option (Classless Static Routes) 151166602Semaste # MUST NOT install the routes specified in the Static Routes 152166602Semaste # option (option code 33) if both a Static Routes option and the 153166602Semaste # Classless Static Routes option are provided. 154166602Semaste 155166602Semaste if [ -n "$new_classless_routes" ]; then 156166602Semaste fill_classless_routes "$new_classless_routes" 157166602Semaste $LOGGER "New Classless Static Routes ($interface): $classless_routes" 158166602Semaste set $classless_routes 159166602Semaste while [ $# -gt 1 ]; do 160166602Semaste if [ "0.0.0.0" = "$2" ]; then 161166602Semaste route add "$1" -iface "$interface" 162166602Semaste else 163166602Semaste route add "$1" "$2" 164166602Semaste fi 165166602Semaste shift; shift 166166602Semaste done 167166602Semaste return 168166602Semaste fi 169166602Semaste 170147072Sbrooks for router in $new_routers; do 171177730Sbrooks if is_default_interface; then 172177730Sbrooks 173177730Sbrooks if [ "$new_ip_address" = "$router" ]; then 174177730Sbrooks route add default -iface $router >/dev/null 2>&1 175177730Sbrooks else 176177730Sbrooks route add default $router >/dev/null 2>&1 177177730Sbrooks fi 178147072Sbrooks fi 179147072Sbrooks # 2nd and subsequent default routers error out, so explicitly 180147072Sbrooks # stop processing the list after the first one. 181147072Sbrooks break 182147072Sbrooks done 183147072Sbrooks 184147072Sbrooks if [ -n "$new_static_routes" ]; then 185147086Sbrooks $LOGGER "New Static Routes ($interface): $new_static_routes" 186147072Sbrooks set $new_static_routes 187147072Sbrooks while [ $# -gt 1 ]; do 188147072Sbrooks route add $1 $2 189147072Sbrooks shift; shift 190147072Sbrooks done 191147072Sbrooks fi 192147072Sbrooks} 193147072Sbrooks 194147072Sbrooksadd_new_resolv_conf() { 195147072Sbrooks # XXX Old code did not create/update resolv.conf unless both 196147072Sbrooks # $new_domain_name and $new_domain_name_servers were provided. PR 197147072Sbrooks # #3135 reported some ISP's only provide $new_domain_name_servers and 198147072Sbrooks # thus broke the script. This code creates the resolv.conf if either 199147072Sbrooks # are provided. 200147072Sbrooks 201154869Sbrooks local tmpres=/var/run/resolv.conf.${interface} 202154702Swes rm -f $tmpres 203147072Sbrooks 204147072Sbrooks if [ -n "$new_domain_name" ]; then 205154702Swes echo "search $new_domain_name" >>$tmpres 206147072Sbrooks fi 207147072Sbrooks 208147072Sbrooks if [ -n "$new_domain_name_servers" ]; then 209147072Sbrooks for nameserver in $new_domain_name_servers; do 210154702Swes echo "nameserver $nameserver" >>$tmpres 211147072Sbrooks done 212147072Sbrooks fi 213147072Sbrooks 214154702Swes if [ -f $tmpres ]; then 215147072Sbrooks if [ -f /etc/resolv.conf.tail ]; then 216154702Swes cat /etc/resolv.conf.tail >>$tmpres 217147072Sbrooks fi 218147072Sbrooks 219219739Sume case $resolvconf_enable in 220219739Sume # "no", "false", "off", or "0" 221219739Sume [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0) 222219739Sume # When resolv.conf is not changed actually, we don't 223219739Sume # need to update it. 224219739Sume # If /usr is not mounted yet, we cannot use cmp, then 225219739Sume # the following test fails. In such case, we simply 226219739Sume # ignore an error and do update resolv.conf. 227219739Sume if cmp -s $tmpres /etc/resolv.conf; then 228219739Sume rm -f $tmpres 229219739Sume return 0 230219739Sume fi 2>/dev/null 231149898Sbrooks 232219739Sume # In case (e.g. during OpenBSD installs) 233219739Sume # /etc/resolv.conf is a symbolic link, take 234219739Sume # care to preserve the link and write the new 235219739Sume # data in the correct location. 236147072Sbrooks 237219739Sume if [ -f /etc/resolv.conf ]; then 238219739Sume cat /etc/resolv.conf > /etc/resolv.conf.save 239219739Sume fi 240219739Sume cat $tmpres > /etc/resolv.conf 241219739Sume 242219739Sume # Try to ensure correct ownership and permissions. 243219739Sume chown -RL root:wheel /etc/resolv.conf 244219739Sume chmod -RL 644 /etc/resolv.conf 245219739Sume ;; 246219739Sume 247219739Sume *) 248219739Sume /sbin/resolvconf -a ${interface} < $tmpres 249219739Sume ;; 250219739Sume esac 251219739Sume 252154702Swes rm -f $tmpres 253147072Sbrooks 254147072Sbrooks return 0 255147072Sbrooks fi 256147072Sbrooks 257147072Sbrooks return 1 258147072Sbrooks} 259147072Sbrooks 260147138Sbrooks# Must be used on exit. Invokes the local dhcp client exit hooks, if any. 261147138Sbrooksexit_with_hooks() { 262147138Sbrooks exit_status=$1 263147138Sbrooks if [ -f /etc/dhclient-exit-hooks ]; then 264147138Sbrooks . /etc/dhclient-exit-hooks 265147138Sbrooks fi 266147138Sbrooks # probably should do something with exit status of the local script 267147138Sbrooks exit $exit_status 268147138Sbrooks} 269147138Sbrooks 270177730Sbrooks# Get the interface with the current ipv4 default route on it using only 271177730Sbrooks# commands that are available prior to /usr being mounted. 272177730Sbrooksis_default_interface() 273177730Sbrooks{ 274179689Sbrooks routeget="`route -n get -inet default`" 275177730Sbrooks oldifs="$IFS" 276177730Sbrooks IFS=" 277177730Sbrooks" 278177730Sbrooks defif= 279177730Sbrooks for line in $routeget ; do 280177730Sbrooks case $line in 281177730Sbrooks *interface:*) 282177730Sbrooks defif=${line##*: } 283177730Sbrooks ;; 284177730Sbrooks esac 285177730Sbrooks done 286177730Sbrooks IFS=${oldifs} 287177730Sbrooks 288177730Sbrooks if [ -z "$defif" -o "$defif" = "$interface" ]; then 289177730Sbrooks return 0 290177730Sbrooks else 291177730Sbrooks return 1 292177730Sbrooks fi 293177730Sbrooks} 294177730Sbrooks 295147072Sbrooks# 296147072Sbrooks# Start of active code. 297147072Sbrooks# 298147072Sbrooks 299147218Sbrooks# Invoke the local dhcp client enter hooks, if they exist. 300147218Sbrooksif [ -f /etc/dhclient-enter-hooks ]; then 301147218Sbrooks exit_status=0 302147218Sbrooks . /etc/dhclient-enter-hooks 303147218Sbrooks # allow the local script to abort processing of this state 304147218Sbrooks # local script must set exit_status variable to nonzero. 305147218Sbrooks if [ $exit_status -ne 0 ]; then 306147218Sbrooks exit $exit_status 307147218Sbrooks fi 308147218Sbrooksfi 309147218Sbrooks 310219739Sume: ${resolvconf_enable="YES"} 311219739Sume 312147072Sbrookscase $reason in 313147072SbrooksMEDIUM) 314171187Sthompsa eval "$IFCONFIG $interface $medium" 315171187Sthompsa eval "$IFCONFIG $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1 316147072Sbrooks sleep 1 317147072Sbrooks ;; 318147072Sbrooks 319147072SbrooksPREINIT) 320147072Sbrooks delete_old_alias 321229583Sglebius $IFCONFIG $interface inet alias 0.0.0.0 netmask 255.0.0.0 broadcast 255.255.255.255 up 322147072Sbrooks ;; 323147072Sbrooks 324147072SbrooksARPCHECK|ARPSEND) 325147072Sbrooks ;; 326147072Sbrooks 327147072SbrooksBOUND|RENEW|REBIND|REBOOT) 328147086Sbrooks check_hostname 329147072Sbrooks if [ -n "$old_ip_address" ]; then 330147072Sbrooks if [ "$old_ip_address" != "$alias_ip_address" ]; then 331147072Sbrooks delete_old_alias 332147072Sbrooks fi 333147072Sbrooks if [ "$old_ip_address" != "$new_ip_address" ]; then 334147072Sbrooks delete_old_address 335147072Sbrooks delete_old_routes 336147072Sbrooks fi 337147072Sbrooks fi 338147072Sbrooks if [ "$reason" = BOUND ] || \ 339147072Sbrooks [ "$reason" = REBOOT ] || \ 340147072Sbrooks [ -z "$old_ip_address" ] || \ 341147072Sbrooks [ "$old_ip_address" != "$new_ip_address" ]; then 342147072Sbrooks add_new_address 343147072Sbrooks add_new_routes 344147072Sbrooks fi 345147072Sbrooks if [ "$new_ip_address" != "$alias_ip_address" ]; then 346147072Sbrooks add_new_alias 347147072Sbrooks fi 348177730Sbrooks if is_default_interface; then 349177730Sbrooks add_new_resolv_conf 350177730Sbrooks fi 351147072Sbrooks ;; 352147072Sbrooks 353147072SbrooksEXPIRE|FAIL) 354147072Sbrooks delete_old_alias 355147072Sbrooks if [ -n "$old_ip_address" ]; then 356147072Sbrooks delete_old_address 357147072Sbrooks delete_old_routes 358147072Sbrooks fi 359154164Sbrooks if [ -x $ARP ]; then 360154164Sbrooks $ARP -d -a -i $interface 361154164Sbrooks fi 362147072Sbrooks # XXX Why add alias we just deleted above? 363147072Sbrooks add_new_alias 364177730Sbrooks if is_default_interface; then 365219739Sume case $resolvconf_enable in 366219739Sume # "no", "false", "off", or "0" 367219739Sume [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0) 368219739Sume if [ -f /etc/resolv.conf.save ]; then 369219739Sume cat /etc/resolv.conf.save > /etc/resolv.conf 370219739Sume fi 371219739Sume ;; 372219739Sume *) 373219739Sume /sbin/resolvconf -d ${interface} 374219739Sume ;; 375219739Sume esac 376147072Sbrooks fi 377147072Sbrooks ;; 378147072Sbrooks 379147072SbrooksTIMEOUT) 380147072Sbrooks delete_old_alias 381147072Sbrooks add_new_address 382147072Sbrooks sleep 1 383147072Sbrooks if [ -n "$new_routers" ]; then 384147086Sbrooks $LOGGER "New Routers ($interface): $new_routers" 385147072Sbrooks set "$new_routers" 386154760Sbrooks if ping -q -c 1 -t 1 "$1"; then 387147072Sbrooks if [ "$new_ip_address" != "$alias_ip_address" ]; then 388147072Sbrooks add_new_alias 389147072Sbrooks fi 390147072Sbrooks add_new_routes 391177730Sbrooks if ! is_default_interface; then 392177730Sbrooks exit_with_hooks 0 393177730Sbrooks fi 394147072Sbrooks if add_new_resolv_conf; then 395147138Sbrooks exit_with_hooks 0 396147072Sbrooks fi 397147072Sbrooks fi 398147072Sbrooks fi 399171187Sthompsa eval "$IFCONFIG $interface inet -alias $new_ip_address $medium" 400147072Sbrooks delete_old_routes 401147138Sbrooks exit_with_hooks 1 402147072Sbrooks ;; 403147072Sbrooksesac 404147072Sbrooks 405147138Sbrooksexit_with_hooks 0 406