1#!/bin/sh
2#
3# $Id: freebsd,v 1.24 2011/05/18 19:55:44 sar Exp $
4#
5# $FreeBSD$
6
7if [ -x /usr/bin/logger ]; then
8	LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
9else
10	LOGGER=echo
11fi
12
13make_resolv_conf() {
14  if [ x"$new_domain_name_servers" != x ]; then
15    ( cat /dev/null > /etc/resolv.conf.dhclient )
16    exit_status=$?
17    if [ $exit_status -ne 0 ]; then
18      $LOGGER "Unable to create /etc/resolv.conf.dhclient: Error $exit_status"
19    else
20      if [ "x$new_domain_search" != x ]; then
21	( echo search $new_domain_search >> /etc/resolv.conf.dhclient )
22	exit_status=$?
23      elif [ "x$new_domain_name" != x ]; then
24	# Note that the DHCP 'Domain Name Option' is really just a domain
25	# name, and that this practice of using the domain name option as
26	# a search path is both nonstandard and deprecated.
27	( echo search $new_domain_name >> /etc/resolv.conf.dhclient )
28	exit_status=$?
29      fi
30      for nameserver in $new_domain_name_servers; do
31	if [ $exit_status -ne 0 ]; then
32	  break
33	fi
34	( echo nameserver $nameserver >>/etc/resolv.conf.dhclient )
35	exit_status=$?
36      done
37
38      # If there were no errors, attempt to mv the new file into place.
39      if [ $exit_status -eq 0 ]; then
40	( mv /etc/resolv.conf.dhclient /etc/resolv.conf )
41	exit_status=$?
42      fi
43
44      if [ $exit_status -ne 0 ]; then
45	$LOGGER "Error while writing new /etc/resolv.conf."
46      fi
47    fi
48  elif [ "x${new_dhcp6_name_servers}" != x ] ; then
49    ( cat /dev/null > /etc/resolv.conf.dhclient6 )
50    exit_status=$?
51    if [ $exit_status -ne 0 ] ; then
52      $LOGGER "Unable to create /etc/resolv.conf.dhclient6: Error $exit_status"
53    else
54      if [ "x${new_dhcp6_domain_search}" != x ] ; then
55	( echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6 )
56	exit_status=$?
57      fi
58      for nameserver in ${new_dhcp6_name_servers} ; do
59	if [ $exit_status -ne 0 ] ; then
60	  break
61	fi
62	# If the nameserver has a link-local address
63	# add a <zone_id> (interface name) to it.
64	case $nameserver in
65	    fe80:*) zone_id="%$interface";;
66	    FE80:*) zone_id="%$interface";;
67	    *)      zone_id="";;
68	esac
69	( echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6 )
70	exit_status=$?
71      done
72
73      if [ $exit_status -eq 0 ] ; then
74        ( mv /etc/resolv.conf.dhclient6 /etc/resolv.conf )
75	exit_status=$?
76      fi
77
78      if [ $exit_status -ne 0 ] ; then
79	$LOGGER "Error while writing new /etc/resolv.conf."
80      fi
81    fi
82  fi
83}
84
85# Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
86exit_with_hooks() {
87  exit_status=$1
88  if [ -f /etc/dhclient-exit-hooks ]; then
89    . /etc/dhclient-exit-hooks
90  fi
91# probably should do something with exit status of the local script
92  exit $exit_status
93}
94
95# This function was largely borrowed from dhclient-script that
96# ships with Centos, authored by Jiri Popelka and David Cantrell
97# of Redhat. Thanks guys.
98add_ipv6_addr_with_DAD() {
99    ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} alias
100
101    if [ ${dad_wait_time} -le 0 ]
102    then
103        # if we're not waiting for DAD, assume we're good
104        return 0
105    fi
106
107    # Repeatedly test whether newly added address passed
108    # duplicate address detection (DAD)
109    for i in $(seq 1 ${dad_wait_time}); do
110        sleep 1 # give the DAD some time
111
112        addr=$(ifconfig ${interface} \
113            | grep "${new_ip6_address} prefixlen ${new_ip6_prefixlen}")
114
115        # tentative flag == DAD is still not complete
116        tentative=$(echo "${addr}" | grep tentative)
117        # dadfailed flag == address is already in use somewhere else
118        dadfailed=$(echo "${addr}" | grep duplicated)
119
120        if [ -n "${dadfailed}" ] ; then
121            # dad failed, remove the address
122            ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} -alias
123            exit_with_hooks 3
124        fi
125
126        if [ -z "${tentative}" ] ; then
127            if [ -n "${addr}" ]; then
128                # DAD is over
129                return 0
130            else
131                # address was auto-removed (or not added at all)
132                exit_with_hooks 3
133            fi
134        fi
135    done
136
137    return 0
138}
139
140# Invoke the local dhcp client enter hooks, if they exist.
141if [ -f /etc/dhclient-enter-hooks ]; then
142  exit_status=0
143  . /etc/dhclient-enter-hooks
144  # allow the local script to abort processing of this state
145  # local script must set exit_status variable to nonzero.
146  if [ $exit_status -ne 0 ]; then
147    exit $exit_status
148  fi
149fi
150
151if [ x$new_network_number != x ]; then
152   $LOGGER New Network Number: $new_network_number
153fi
154
155if [ x$new_broadcast_address != x ]; then
156 $LOGGER New Broadcast Address: $new_broadcast_address
157  new_broadcast_arg="broadcast $new_broadcast_address"
158fi
159if [ x$old_broadcast_address != x ]; then
160  old_broadcast_arg="broadcast $old_broadcast_address"
161fi
162if [ x$new_subnet_mask != x ]; then
163  new_netmask_arg="netmask $new_subnet_mask"
164fi
165if [ x$old_subnet_mask != x ]; then
166  old_netmask_arg="netmask $old_subnet_mask"
167fi
168if [ x$alias_subnet_mask != x ]; then
169  alias_subnet_arg="netmask $alias_subnet_mask"
170fi
171if [ x$new_interface_mtu != x ]; then
172  mtu_arg="mtu $new_interface_mtu"
173fi
174if [ x$IF_METRIC != x ]; then
175  metric_arg="metric $IF_METRIC"
176fi
177
178if [ x$reason = xMEDIUM ]; then
179  eval "ifconfig $interface $medium"
180  eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1
181  sleep 1
182  exit_with_hooks 0
183fi
184
185###
186### DHCPv4 Handlers
187###
188
189if [ x$reason = xPREINIT ]; then
190  if [ x$alias_ip_address != x ]; then
191    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
192    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
193  fi
194  ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
195		broadcast 255.255.255.255 up
196  exit_with_hooks 0
197fi
198
199if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
200  exit_with_hooks 0;
201fi
202
203if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
204   [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
205  current_hostname=`/bin/hostname`
206  if [ x$current_hostname = x ] || \
207     [ x$current_hostname = x$old_host_name ]; then
208    if [ x$current_hostname = x ] || \
209       [ x$new_host_name != x$old_host_name ]; then
210      $LOGGER "New Hostname: $new_host_name"
211      hostname $new_host_name
212    fi
213  fi
214  if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
215		[ x$alias_ip_address != x$old_ip_address ]; then
216    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
217    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
218  fi
219  if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]
220   then
221    eval "ifconfig $interface inet -alias $old_ip_address $medium"
222    route delete $old_ip_address 127.1 >/dev/null 2>&1
223    for router in $old_routers; do
224      route delete default $router >/dev/null 2>&1
225    done
226    if [ -n "$old_static_routes" ]; then
227      set -- $old_static_routes
228      while [ $# -gt 1 ]; do
229	route delete $1 $2
230	shift; shift
231      done
232    fi
233    arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' |sh
234  fi
235  if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
236     [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
237    eval "ifconfig $interface inet $new_ip_address $new_netmask_arg \
238			$new_broadcast_arg $mtu_arg $metric_arg $medium"
239    $LOGGER "New IP Address ($interface): $new_ip_address"
240    $LOGGER "New Subnet Mask ($interface): $new_subnet_mask"
241    $LOGGER "New Broadcast Address ($interface): $new_broadcast_address"
242    if [ -n "$new_routers" ]; then
243      $LOGGER "New Routers: $new_routers"
244    fi
245    route add $new_ip_address 127.1 >/dev/null 2>&1
246    for router in $new_routers; do
247      # If the subnet is captive, eg the netmask is /32 but the default
248      # gateway is (obviously) outside of this, then we need to produce a
249      # host route to reach the gateway.
250      if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
251	route add -host $router -interface $interface
252      fi
253      route add default $router >/dev/null 2>&1
254    done
255    if [ -n "$new_static_routes" ]; then
256      $LOGGER "New Static Routes: $new_static_routes"
257      set -- $new_static_routes
258      while [ $# -gt 1 ]; do
259	route add $1 $2
260	shift; shift
261      done
262    fi
263  else
264    # we haven't changed the address, have we changed other options
265    # that we wish to update?
266    if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then
267      # if we've changed routers delete the old and add the new.
268      $LOGGER "New Routers: $new_routers"
269      for router in $old_routers; do
270        route delete default $router >/dev/null 2>&1
271      done
272      for router in $new_routers; do
273        # If the subnet is captive, eg the netmask is /32 but the default
274        # gateway is (obviously) outside of this, then we need to produce a
275        # host route to reach the gateway.
276        if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
277          route add -host $router -interface $interface
278        fi
279        route add default $router >/dev/null 2>&1
280      done
281    fi
282  fi
283  if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
284   then
285    ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
286    route add $alias_ip_address 127.0.0.1
287  fi
288  make_resolv_conf
289  exit_with_hooks 0
290fi
291
292if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
293   || [ x$reason = xSTOP ]; then
294  if [ x$alias_ip_address != x ]; then
295    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
296    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
297  fi
298  if [ x$old_ip_address != x ]; then
299    eval "ifconfig $interface inet -alias $old_ip_address $medium"
300    route delete $old_ip_address 127.1 >/dev/null 2>&1
301    for router in $old_routers; do
302      route delete default $router >/dev/null 2>&1
303    done
304    if [ -n "$old_static_routes" ]; then
305      set -- $old_static_routes
306      while [ $# -gt 1 ]; do
307	route delete $1 $2
308	shift; shift
309      done
310    fi
311    arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' \
312						|sh >/dev/null 2>&1
313  fi
314  if [ x$alias_ip_address != x ]; then
315    ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
316    route add $alias_ip_address 127.0.0.1
317  fi
318  exit_with_hooks 0
319fi
320
321if [ x$reason = xTIMEOUT ]; then
322  if [ x$alias_ip_address != x ]; then
323    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
324    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
325  fi
326  eval "ifconfig $interface inet $new_ip_address $new_netmask_arg \
327			$new_broadcast_arg $mtu_arg $metric_arg $medium"
328  $LOGGER "New IP Address ($interface): $new_ip_address"
329  $LOGGER "New Subnet Mask ($interface): $new_subnet_mask"
330  $LOGGER "New Broadcast Address ($interface): $new_broadcast_address"
331  sleep 1
332  if [ -n "$new_routers" ]; then
333    $LOGGER "New Routers: $new_routers"
334    set -- $new_routers
335    if ping -q -c 1 $1; then
336      if [ x$new_ip_address != x$alias_ip_address ] && \
337			[ x$alias_ip_address != x ]; then
338	ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
339	route add $alias_ip_address 127.0.0.1
340      fi
341      route add $new_ip_address 127.1 >/dev/null 2>&1
342      for router in $new_routers; do
343	if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
344	  route add -host $router -interface $interface
345	fi
346	route add default $router >/dev/null 2>&1
347      done
348      set -- $new_static_routes
349      while [ $# -gt 1 ]; do
350	route add $1 $2
351	shift; shift
352      done
353      make_resolv_conf
354      exit_with_hooks 0
355    fi
356  fi
357  eval "ifconfig $interface inet -alias $new_ip_address $medium"
358  for router in $old_routers; do
359    route delete default $router >/dev/null 2>&1
360  done
361  if [ -n "$old_static_routes" ]; then
362    set -- $old_static_routes
363    while [ $# -gt 1 ]; do
364      route delete $1 $2
365      shift; shift
366    done
367  fi
368  arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' \
369							|sh >/dev/null 2>&1
370  exit_with_hooks 1
371fi
372
373###
374### DHCPv6 Handlers
375###
376
377if [ ${reason} = PREINIT6 ] ; then
378  # Ensure interface is up.
379  ifconfig ${interface} up
380
381  # XXX: Remove any stale addresses from aborted clients.
382
383  # We need to give the kernel some time to active interface
384  interface_up_wait_time=5
385  for i in $(seq 0 ${interface_up_wait_time})
386  do
387      ifconfig ${interface} | grep inactive >/dev/null 2>&1
388      if [ $? -ne 0 ]; then
389          break;
390      fi
391      sleep 1
392  done
393
394  # Wait for duplicate address detection for this interface if the
395  # --dad-wait-time parameter has been specified and is greater than
396  # zero.
397  if [ ${dad_wait_time} -gt 0 ]; then
398      # Check if any IPv6 address on this interface is marked as
399      # tentative.
400      ifconfig ${interface} | grep inet6 | grep tentative \
401          >/dev/null 2>&1
402      if [ $? -eq 0 ]; then
403          # Wait for duplicate address detection to complete or for
404          # the timeout specified as --dad-wait-time.
405          for i in $(seq 0 $dad_wait_time)
406          do
407              # We're going to poll for the tentative flag every second.
408              sleep 1
409              ifconfig ${interface} | grep inet6 | grep tentative \
410                  >/dev/null 2>&1
411              if [ $? -ne 0 ]; then
412                  break;
413              fi
414          done
415      fi
416  fi
417
418
419  exit_with_hooks 0
420fi
421
422if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
423    echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
424
425    exit_with_hooks 0
426fi
427
428if [ ${reason} = BOUND6 ] ; then
429  if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
430    exit_with_hooks 2;
431  fi
432
433  # Add address to interface, check for DAD if dad_wait_time > 0
434  add_ipv6_addr_with_DAD
435
436  # Check for nameserver options.
437  make_resolv_conf
438
439  exit_with_hooks 0
440fi
441
442if [ ${reason} = RENEW6 ] || [ ${reason} = REBIND6 ] ; then
443  # Make sure nothing has moved around on us.
444
445  # Nameservers/domains/etc.
446  if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
447     [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
448    make_resolv_conf
449  fi
450
451  exit_with_hooks 0
452fi
453
454if [ ${reason} = DEPREF6 ] ; then
455  if [ x${new_ip6_address} = x ] ; then
456    exit_with_hooks 2;
457  fi
458
459  ifconfig ${interface} inet6 ${new_ip6_address} deprecated
460
461  exit_with_hooks 0
462fi
463
464if [ ${reason} = EXPIRE6 -o ${reason} = RELEASE6 -o ${reason} = STOP6 ] ; then
465  if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
466    exit_with_hooks 2;
467  fi
468
469  ifconfig ${interface} inet6 ${old_ip6_address}/${old_ip6_prefixlen} -alias
470
471  exit_with_hooks 0
472fi
473
474exit_with_hooks 0
475