1#!/bin/sh
2
3make_resolv_conf() {
4  if [ x"$new_domain_name_servers" != x ]; then
5    cat /dev/null > /etc/resolv.conf.dhclient
6    if [ x"$new_domain_search" != x ]; then
7      echo search $new_domain_search >> /etc/resolv.conf.dhclient
8    elif [ x"$new_domain_name" != x ]; then
9      # Note that the DHCP 'Domain Name Option' is really just a domain
10      # name, and that this practice of using the domain name option as
11      # a search path is both nonstandard and deprecated.
12      echo search $new_domain_name >> /etc/resolv.conf.dhclient
13    fi
14    for nameserver in $new_domain_name_servers; do
15      echo nameserver $nameserver >>/etc/resolv.conf.dhclient
16    done
17
18    mv /etc/resolv.conf.dhclient /etc/resolv.conf
19  elif [ "x${new_dhcp6_name_servers}" != x ] ; then
20    cat /dev/null > /etc/resolv.conf.dhclient6
21    chmod 644 /etc/resolv.conf.dhclient6
22
23    if [ "x${new_dhcp6_domain_search}" != x ] ; then
24      echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
25    fi
26    for nameserver in ${new_dhcp6_name_servers} ; do
27      # If the nameserver has a link-local address
28      # add a <zone_id> (interface name) to it.
29      case $nameserver in
30	fe80:*) zone_id="%$interface";;
31	FE80:*) zone_id="%$interface";;
32	*)      zone_id="";;
33      esac
34      echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6
35    done
36
37    mv /etc/resolv.conf.dhclient6 /etc/resolv.conf
38  fi
39}
40
41# Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
42exit_with_hooks() {
43  exit_status=$1
44  if [ -f /etc/dhclient-exit-hooks ]; then
45    . /etc/dhclient-exit-hooks
46  fi
47# probably should do something with exit status of the local script
48  exit $exit_status
49}
50
51# This function was largely borrowed from dhclient-script that
52# ships with Centos, authored by Jiri Popelka and David Cantrell
53# of Redhat. Thanks guys.
54add_ipv6_addr_with_DAD() {
55    ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} alias
56
57    if [ ${dad_wait_time} -le 0 ]
58    then
59        # if we're not waiting for DAD, assume we're good
60        return 0
61    fi
62
63    # Repeatedly test whether newly added address passed
64    # duplicate address detection (DAD)
65    i=0
66    while [ $i -lt ${dad_wait_time} ]; do
67        sleep 1 # give the DAD some time
68
69        addr=$(ifconfig ${interface} \
70            | grep "${new_ip6_address} prefixlen ${new_ip6_prefixlen}")
71
72        # tentative flag == DAD is still not complete
73        tentative=$(echo "${addr}" | grep tentative)
74        # dadfailed flag == address is already in use somewhere else
75        dadfailed=$(echo "${addr}" | grep duplicated)
76
77        if [ -n "${dadfailed}" ] ; then
78            # dad failed, remove the address
79            ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} -alias
80            exit_with_hooks 3
81        fi
82
83        if [ -z "${tentative}" ] ; then
84            if [ -n "${addr}" ]; then
85                # DAD is over
86                return 0
87            else
88                # address was auto-removed (or not added at all)
89                exit_with_hooks 3
90            fi
91        fi
92        true $(( i++ ))
93    done
94
95    return 0
96}
97
98# Invoke the local dhcp client enter hooks, if they exist.
99if [ -f /etc/dhclient-enter-hooks ]; then
100  exit_status=0
101  . /etc/dhclient-enter-hooks
102  # allow the local script to abort processing of this state
103  # local script must set exit_status variable to nonzero.
104  if [ $exit_status -ne 0 ]; then
105    exit $exit_status
106  fi
107fi
108
109if [ x$new_network_number != x ]; then
110   echo New Network Number: $new_network_number
111fi
112
113if [ x$new_broadcast_address != x ]; then
114 echo New Broadcast Address: $new_broadcast_address
115  new_broadcast_arg="broadcast $new_broadcast_address"
116fi
117if [ x$old_broadcast_address != x ]; then
118  old_broadcast_arg="broadcast $old_broadcast_address"
119fi
120if [ x$new_subnet_mask != x ]; then
121  new_netmask_arg="netmask $new_subnet_mask"
122fi
123if [ x$old_subnet_mask != x ]; then
124  old_netmask_arg="netmask $old_subnet_mask"
125fi
126if [ x$alias_subnet_mask != x ]; then
127  alias_subnet_arg="netmask $alias_subnet_mask"
128fi
129
130if [ x$reason = xMEDIUM ]; then
131  eval "ifconfig $interface $medium"
132  eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1
133  sleep 1
134  exit_with_hooks 0
135fi
136
137###
138### DHCPv4 Handlers
139###
140
141if [ x$reason = xPREINIT ]; then
142  if [ x$alias_ip_address != x ]; then
143    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
144    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
145  fi
146  ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
147		broadcast 255.255.255.255 up
148  exit_with_hooks 0
149fi
150
151if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
152  exit_with_hooks 0;
153fi
154
155if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
156   [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
157  current_hostname=`hostname`
158  if [ x$current_hostname = x ] || \
159     [ x$current_hostname = x$old_host_name ]; then
160    if [ x$current_hostname = x ] || \
161       [ x$new_host_name != x$old_host_name ]; then
162      hostname $new_host_name
163    fi
164  fi
165
166  if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
167		[ x$alias_ip_address != x$old_ip_address ]; then
168    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
169    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
170  fi
171  if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]
172   then
173    eval "ifconfig $interface inet -alias $old_ip_address $medium"
174    route delete $old_ip_address 127.1 >/dev/null 2>&1
175    for router in $old_routers; do
176      route delete default $router >/dev/null 2>&1
177    done
178    if [ "$old_static_routes" != "" ]; then
179      set $old_static_routes
180      while [ $# -gt 1 ]; do
181	route delete $1 $2
182	shift; shift
183      done
184    fi
185    arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/p' |sh
186  fi
187  if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
188     [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
189    eval "ifconfig $interface inet $new_ip_address $new_netmask_arg \
190					$new_broadcast_arg $medium"
191    route add $new_ip_address 127.1 >/dev/null 2>&1
192    for router in $new_routers; do
193      route add default $router >/dev/null 2>&1
194    done
195    if [ "$new_static_routes" != "" ]; then
196      set $new_static_routes
197      while [ $# -gt 1 ]; do
198	route add $1 $2
199	shift; shift
200      done
201    fi
202  else
203    # we haven't changed the address, have we changed other options
204    # that we wish to update?
205    if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then
206      # if we've changed routers delete the old and add the new.
207      $LOGGER "New Routers: $new_routers"
208      for router in $old_routers; do
209        route delete default $router >/dev/null 2>&1
210      done
211      for router in $new_routers; do
212        route add default $router >/dev/null 2>&1
213      done
214    fi
215  fi
216  if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
217   then
218    ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
219    route add $alias_ip_address 127.0.0.1
220  fi
221  make_resolv_conf
222  exit_with_hooks 0
223fi
224
225if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
226   || [ x$reason = xSTOP ]; then
227  if [ x$alias_ip_address != x ]; then
228    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
229    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
230  fi
231  if [ x$old_ip_address != x ]; then
232    eval "ifconfig $interface inet -alias $old_ip_address $medium"
233    route delete $old_ip_address 127.1 >/dev/null 2>&1
234    for router in $old_routers; do
235      route delete default $router >/dev/null 2>&1
236    done
237    if [ "$old_static_routes" != "" ]; then
238      set $old_static_routes
239      while [ $# -gt 1 ]; do
240	route delete $1 $2
241	shift; shift
242      done
243    fi
244    arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/p' \
245						|sh >/dev/null 2>&1
246  fi
247  if [ x$alias_ip_address != x ]; then
248    ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
249    route add $alias_ip_address 127.0.0.1
250  fi
251  exit_with_hooks 0
252fi
253
254if [ x$reason = xTIMEOUT ]; then
255  if [ x$alias_ip_address != x ]; then
256    ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
257    route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
258  fi
259  eval "ifconfig $interface inet $new_ip_address $new_netmask_arg \
260					$new_broadcast_arg $medium"
261  sleep 1
262  if [ "$new_routers" != "" ]; then
263    set $new_routers
264    if ping -q -c 1 -w 1 $1; then
265      if [ x$new_ip_address != x$alias_ip_address ] && \
266			[ x$alias_ip_address != x ]; then
267	ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
268	route add $alias_ip_address 127.0.0.1
269      fi
270      route add $new_ip_address 127.1 >/dev/null 2>&1
271      for router in $new_routers; do
272	route add default $router >/dev/null 2>&1
273      done
274      set $new_static_routes
275      while [ $# -gt 1 ]; do
276	route add $0 $1
277	shift; shift
278      done
279      make_resolv_conf
280      exit_with_hooks 0
281    fi
282  fi
283  eval "ifconfig $interface inet -alias $new_ip_address $medium"
284  for router in $old_routers; do
285    route delete default $router >/dev/null 2>&1
286  done
287  if [ "$old_static_routes" != "" ]; then
288    set $old_static_routes
289    while [ $# -gt 1 ]; do
290      route delete $1 $2
291      shift; shift
292    done
293  fi
294  arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/p' \
295							|sh >/dev/null 2>&1
296  exit_with_hooks 1
297fi
298
299###
300### DHCPv6 Handlers
301###
302
303if [ ${reason} = PREINIT6 ] ; then
304  # Ensure interface is up.
305  ifconfig ${interface} up
306
307  # XXX: Remove any stale addresses from aborted clients.
308
309  # We need to give the kernel some time to active interface
310  interface_up_wait_time=5
311  i=0
312  while [ $i -lt ${interface_up_wait_time} ]; do
313      ifconfig ${interface} | grep inactive >/dev/null 2>&1
314      if [ $? -ne 0 ]; then
315          break;
316      fi
317      sleep 1
318      true $(( i++ ))
319  done
320
321  # Wait for duplicate address detection for this interface if the
322  # --dad-wait-time parameter has been specified and is greater than
323  # zero.
324  if [ ${dad_wait_time} -gt 0 ]; then
325      # Check if any IPv6 address on this interface is marked as
326      # tentative.
327      ifconfig ${interface} | grep inet6 | grep tentative \
328          >/dev/null 2>&1
329      if [ $? -eq 0 ]; then
330          # Wait for duplicate address detection to complete or for
331          # the timeout specified as --dad-wait-time.
332          i=0
333          while [ $i -lt ${dad_wait_time} ]; do
334              # We're going to poll for the tentative flag every second.
335              sleep 1
336              ifconfig ${interface} | grep inet6 | grep tentative \
337                  >/dev/null 2>&1
338              if [ $? -ne 0 ]; then
339                  break;
340              fi
341          true $(( i++ ))
342          done
343      fi
344  fi
345
346  exit_with_hooks 0
347fi
348
349if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
350    echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
351
352    exit_with_hooks 0
353fi
354
355if [ ${reason} = BOUND6 ] ; then
356  if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
357    exit_with_hooks 2;
358  fi
359
360  # Add address to interface, check for DAD if dad_wait_time > 0
361  add_ipv6_addr_with_DAD
362
363  # Check for nameserver options.
364  make_resolv_conf
365
366  exit_with_hooks 0
367fi
368
369if [ ${reason} = RENEW6 ] || [ ${reason} = REBIND6 ] ; then
370  # Make sure nothing has moved around on us.
371
372  # Nameservers/domains/etc.
373  if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
374     [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
375    make_resolv_conf
376  fi
377
378  exit_with_hooks 0
379fi
380
381if [ ${reason} = DEPREF6 ] ; then
382  if [ x${new_ip6_prefixlen} = x ] ; then
383    exit_with_hooks 2;
384  fi
385
386  # XXX:
387  # There doesn't appear to be a way to update an addr to indicate
388  # preference.
389
390  exit_with_hooks 0
391fi
392
393if [ ${reason} = EXPIRE6 -o ${reason} = RELEASE6 -o ${reason} = STOP6 ] ; then
394  if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
395    exit_with_hooks 2;
396  fi
397
398  ifconfig ${interface} inet6 -alias ${old_ip6_address}/${old_ip6_prefixlen}
399
400  exit_with_hooks 0
401fi
402
403exit_with_hooks 0
404