sbin/dhclient/dhclient-script.sh

   1 #!/bin/sh
   2
   3 #############################################################################
   4 #
   5 # Copyright (c) 1999, MindStep Corporation
   6 # All rights reserved.
   7 #
   8 # Redistribution and use in source and binary forms, with or without
   9 # modification, are permitted provided that the following conditions
  10 # are met:
  11 # 1. Redistributions of source code must retain the above copyright
  12 #    notice, this list of conditions and the following disclaimer.
  13 # 2. Redistributions in binary form must reproduce the above copyright
  14 #    notice, this list of conditions and the following disclaimer in the
  15 #    documentation and/or other materials provided with the distribution.
  16 #
  17 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27 # SUCH DAMAGE.
  28 #
  29 #
  30 #############################################################################
  31 #
  32 # This script was written by Patrick Bihan-Faou, patrick@mindstep.com,
  33 # Please contact us for bug reports, etc.
  34 #
  35 #############################################################################
  36 # $MindStep_Id: dhclient-script.sh,v 1.8 1999/12/07 22:11:08 patrick Exp $
  37 # $MindStep_Tag: CONTRIB_19991207 $
  38 # $FreeBSD: src/sbin/dhclient/dhclient-script.sh,v 1.2.2.1 2002/04/11 10:21:20 murray Exp $
  39 # $DragonFly: src/sbin/dhclient/Attic/dhclient-script.sh,v 1.2 2003/06/17 04:27:32 dillon Exp $
  40 #############################################################################
  41
  42
  43 #############################################################################
  44 # hook functions prototypes
  45 #
  46 # The "pre_state_XXX_hook" functions are called before the main
  47 # work is done for the state XXX
  48 #
  49 # The "post_state_XXX_hook" functions are called after the main
  50 # work is done for the state XXX
  51 #
  52 # These functions are meant to be overridden by the user's
  53 # dhclient-enter-hooks file
  54 #############################################################################
  55
  56 pre_state_MEDIUM_hook () { }
  57 pre_state_PREINIT_hook () { }
  58 pre_state_ARPCHECK_hook () { }
  59 pre_state_ARPSEND_hook () { }
  60 pre_state_RENEW_hook () { }
  61 pre_state_REBIND_hook () { }
  62 pre_state_BOUND_hook () { }
  63 pre_state_REBOOT_hook () { }
  64 pre_state_EXPIRE_hook () { }
  65 pre_state_FAIL_hook () { }
  66 pre_state_TIMEOUT_hook () { }
  67 post_state_MEDIUM_hook () { }
  68 post_state_PREINIT_hook () { }
  69 post_state_ARPCHECK_hook () { }
  70 post_state_ARPSEND_hook () { }
  71 post_state_RENEW_hook () { }
  72 post_state_REBIND_hook () { }
  73 post_state_BOUND_hook () { }
  74 post_state_REBOOT_hook () { }
  75 post_state_EXPIRE_hook () { }
  76 post_state_FAIL_hook () { }
  77 post_state_TIMEOUT_hook () { }
  78
  79 #############################################################################
  80 # make_resolv_conf
  81 #
  82 # This function is called to update the information related to the
  83 # DNS configuration (the resolver part)
  84 #############################################################################
  85 make_resolv_conf ()
  86 {
  87    if [ "x$new_domain_name" != x ] && [ "x$new_domain_name_servers" != x ]; then
  88      echo search $new_domain_name >/etc/resolv.conf
  89      for nameserver in $new_domain_name_servers; do
  90        echo nameserver $nameserver >>/etc/resolv.conf
  91      done
  92    fi
  93 }
  94
  95 # Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
  96 exit_with_hooks () {
  97   exit_status=$1
  98   if [ -x /etc/dhclient-exit-hooks ]; then
  99     . /etc/dhclient-exit-hooks
 100   fi
 101 # probably should do something with exit status of the local script
 102   return $exit_status
 103 }
 104
 105 #############################################################################
 106 # set_XXX
 107 # unset_XXX
 108 #
 109 # These function each deal with one particular setting.
 110 # They are OS dependent and may be overridden in the
 111 # dhclient-enter-hooks file if needed.
 112 #
 113 # These functions are called with either "new" or "old" to indicate which
 114 # set of variables to use (new_ip_address or old_ip_address...)
 115 #
 116 #############################################################################
 117
 118 update_hostname ()
 119 {
 120         local current_hostname=`/bin/hostname`
 121         if      [ "$current_hostname" = "" ] || \
 122                 [ "$current_hostname" = "$old_host_name" ]
 123         then
 124                 if [ "$new_host_name" != "$old_host_name" ]
 125                 then
 126                         $LOGGER "New Hostname: $new_host_name"
 127                         hostname $new_host_name
 128                 fi
 129         fi
 130 }
 131
 132 set_ip_address ()
 133 {
 134         local ip
 135         local mask
 136         local bcast
 137
 138         if [ $# -lt 1 ]
 139         then
 140                 return  1
 141         fi
 142
 143         eval ip="\$${1}_ip_address"
 144         eval mask="\$${1}_subnet_mask"
 145         eval bcast="\$${1}_broadcast_address"
 146
 147         if [ "$ip" != "" ]
 148         then
 149                 ifconfig $interface inet $ip netmask $mask broadcast $bcast $medium
 150 #               route add $ip 127.0.0.1 > /dev/null 2>&1
 151         fi
 152 }
 153
 154 unset_ip_address ()
 155 {
 156         local ip
 157
 158         if [ $# -lt 1 ]
 159         then
 160                 return  1
 161         fi
 162
 163         eval ip="\$${1}_ip_address"
 164
 165         if [ "$ip" != "" ]
 166         then
 167                 ifconfig $interface inet -alias $ip $medium
 168 #               route delete $ip 127.0.0.1 > /dev/null 2>&1
 169         fi
 170 }
 171
 172 set_ip_alias ()
 173 {
 174         if [ "$alias_ip_address" != "" ]
 175         then
 176                 ifconfig $interface inet alias $alias_ip_address netmask $alias_subnet_mask
 177 #               route add $alias_ip_address 127.0.0.1
 178         fi
 179 }
 180
 181 unset_ip_alias ()
 182 {
 183         if [ "$alias_ip_address" != "" ]
 184         then
 185                 ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
 186 #               route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
 187         fi
 188 }
 189
 190 set_routers ()
 191 {
 192         local router_list
 193
 194         if [ $# -lt 1 ]
 195         then
 196                 return  1
 197         fi
 198
 199         eval router_list="\$${1}_routers"
 200
 201         for router in $router_list
 202         do
 203                 route add default $router >/dev/null 2>&1
 204         done
 205 }
 206
 207 unset_routers ()
 208 {
 209         local router_list
 210
 211         if [ $# -lt 1 ]
 212         then
 213                 return  1
 214         fi
 215
 216         eval router_list="\$${1}_routers"
 217
 218         for router in $router_list
 219         do
 220                 route delete default $router >/dev/null 2>&1
 221         done
 222 }
 223
 224 set_static_routes ()
 225 {
 226         local static_routes
 227
 228         if [ $# -lt 1 ]
 229         then
 230                 return  1
 231         fi
 232
 233         eval static_routes="\$${1}_static_routes"
 234
 235         set static_routes
 236
 237         while [ $# -ge 2 ]
 238         do
 239                 $LOGGER "New Static Route: $1 -> $2"
 240                 route add $1 $2
 241                 shift; shift
 242         done
 243 }
 244
 245 unset_static_routes ()
 246 {
 247         local static_routes
 248
 249         if [ $# -lt 1 ]
 250         then
 251                 return  1
 252         fi
 253
 254         eval static_routes="\$${1}_static_routes"
 255
 256         set static_routes
 257
 258         while [ $# -ge 2 ]
 259         do
 260                 route delete $1 $2
 261                 shift; shift
 262         done
 263 }
 264
 265 #############################################################################
 266 #
 267 # utility functions grouping what needs to be done in logical units.
 268 #
 269 #############################################################################
 270
 271 set_all ()
 272 {
 273         set_ip_address new
 274         set_routers new
 275         set_static_routes new
 276
 277         if      [ "$new_ip_address" != "$alias_ip_address" ]
 278         then
 279                 set_ip_alias
 280         fi
 281 }
 282
 283 set_others ()
 284 {
 285         update_hostname
 286         make_resolv_conf
 287 }
 288
 289 clear_arp_table ()
 290 {
 291         arp -d -a
 292 }
 293
 294 unset_all ()
 295 {
 296         if [ "$alias_ip_address" != "$old_ip_address" ]
 297         then
 298                 unset_ip_alias
 299         fi
 300
 301         if [ "$old_ip_address" != "" ]
 302         then
 303                 unset_ip_address old
 304                 unset_routers old
 305                 unset_static_routes old
 306                 clear_arp_table
 307         fi
 308 }
 309
 310 test_new_lease ()
 311 {
 312         local rc
 313
 314         set $new_routers
 315
 316         if [ $# -ge 1 ]
 317         then
 318                 set_ip_address new
 319         if ping -q -c 1 $1
 320                 then
 321                         rc=0
 322                 else
 323                         rc=1
 324                 fi
 325                 unset_ip_address new
 326         else
 327                 rc=1
 328         fi
 329         return  $rc
 330 }
 331
 332 #############################################################################
 333 # Main State functions.
 334 #
 335 # There is a state function for each state of the DHCP client
 336 # These functions are OS specific and should be be tampered with.
 337 #############################################################################
 338
 339 in_state_MEDIUM ()
 340 {
 341   ifconfig $interface $medium
 342   ifconfig $interface inet -alias 0.0.0.0 $medium >/dev/null 2>&1
 343   sleep 1
 344   exit_status=0
 345 }
 346
 347 in_state_PREINIT ()
 348 {
 349         unset_ip_alias
 350
 351         ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
 352                         broadcast 255.255.255.255 up
 353         exit_status=0
 354 }
 355
 356 in_state_ARPCHECK ()
 357 {
 358   exit_status=0
 359 }
 360
 361 in_state_ARPSEND ()
 362 {
 363   exit_status=0
 364 }
 365
 366 in_state_RENEW ()
 367 {
 368         if [ "$old_ip_address" != "$new_ip_address" ]
 369         then
 370                 unset_all
 371                 set_all
 372         fi
 373
 374         set_others
 375 }
 376
 377 in_state_REBIND () {
 378         in_state_RENEW
 379 }
 380
 381 in_state_BOUND () {
 382         unset_all
 383         set_all
 384         set_others
 385 }
 386
 387 in_state_REBOOT () {
 388         in_state_BOUND
 389 }
 390
 391 in_state_EXPIRE ()
 392 {
 393         unset_all
 394         set_ip_alias
 395         exit_status=0
 396 }
 397
 398 in_state_FAIL () {
 399         in_state_EXPIRE
 400 }
 401
 402 in_state_TIMEOUT ()
 403 {
 404         unset_all
 405
 406         if test_new_lease
 407         then
 408                 set_all
 409                 set_others
 410         else
 411                 $LOGGER "No good lease information in TIMEOUT state"
 412                 set_ip_alias
 413                 exit_status=1
 414         fi
 415 }
 416
 417 #############################################################################
 418 # Main functions:
 419 #
 420 # dhclient_script_init() parses the optional "enter_hooks" script which can
 421 #   override any of the state functions
 422 #
 423 # This function also parses the variables and notifies the detected changes.
 424 #############################################################################
 425 dhclient_script_init ()
 426 {
 427         if [ -x /usr/bin/logger ]; then
 428                 LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
 429         else
 430                 LOGGER=echo
 431         fi
 432
 433         # Invoke the local dhcp client enter hooks, if they exist.
 434         if [ -x /etc/dhclient-enter-hooks ]
 435         then
 436                 exit_status=0
 437                 . /etc/dhclient-enter-hooks
 438                 # allow the local script to abort processing of this state
 439                 # local script must set exit_status variable to nonzero.
 440                 if [ $exit_status -ne 0 ]
 441                 then
 442                         exit $exit_status
 443                 fi
 444         fi
 445
 446         if [ "$new_network_number" != "" ]
 447         then
 448                 $LOGGER "New Network Number: $new_network_number"
 449         fi
 450
 451         if [ "$new_ip_address" != "" ]
 452         then
 453                 $LOGGER "New IP Address: $new_ip_address"
 454         fi
 455
 456         if [ "$new_broadcast_address" != "" ]
 457         then
 458                 $LOGGER "New Broadcast Address: $new_broadcast_address"
 459         fi
 460
 461         if [ "$new_subnet_mask" != "" ]
 462         then
 463                 $LOGGER "New Subnet Mask for $interface: $new_subnet_mask"
 464         fi
 465
 466         if [ "$alias_subnet_mask" != "" ]
 467         then
 468         fi
 469 }
 470
 471 #############################################################################
 472 # dhclient_main() does the appropriate work depending on the state of
 473 # the dhcp client
 474 #############################################################################
 475 dhclient_script_main ()
 476 {
 477 #       set -x
 478         exit_status=0
 479
 480         case $reason in
 481                 MEDIUM|\
 482                 PREINIT|\
 483                 ARPCHECK|\
 484                 ARPSEND|\
 485                 RENEW|\
 486                 REBIND|\
 487                 BOUND|\
 488                 REBOOT|\
 489                 EXPIRE|\
 490                 FAIL|\
 491                 TIMEOUT)
 492                         pre_state_${reason}_hook
 493                         in_state_${reason}
 494                         post_state_${reason}_hook
 495                         ;;
 496                 *)
 497                         $LOGGER "dhclient-script called with invalid reason $reason"
 498                         exit_status=1
 499                         ;;
 500         esac
 501
 502         exit_with_hooks $exit_status
 503 }
 504
 505 #############################################################################
 506 # Let's do the work...
 507 #############################################################################
 508
 509 dhclient_script_init
 510 dhclient_script_main
 511 exit $exit_status
 512
 513 #############################################################################
 514 # That's all folks
 515 #############################################################################