1#!/bin/sh
2#
3# $Id: macos,v 1.4 2011/09/20 16:59:54 sar Exp $
4#
5# automous run of this script will commit the DNS setting
6#
7
8if [ -x /usr/bin/logger ]; then
9	LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
10else
11	LOGGER=echo
12fi
13
14to_commit="yes"
15
16make_resolv_conf() {
17  to_commit="no"
18  if [ "x${new_dhcp6_name_servers}" != x ]; then
19    ( cat /dev/null > /var/run/resolv.conf.dhclient6 )
20    exit_status=$?
21    if [ $exit_status -ne 0 ]; then
22      $LOGGER "Unable to create /var/run/resolv.conf.dhclient6: Error $exit_status"
23    else
24      if [ "x${new_dhcp6_domain_search}" != x ]; then
25	( echo search ${new_dhcp6_domain_search} >> /var/run/resolv.conf.dhclient6 )
26	exit_status=$?
27      fi
28      for nameserver in ${new_dhcp6_name_servers} ; do
29	if [ $exit_status -ne 0 ]; then
30	  break
31	fi
32	# If the nameserver has a link-local address
33	# add a <zone_id> (interface name) to it.
34	case $nameserver in
35	    fe80:*) zone_id="%$interface";;
36	    FE80:*) zone_id="%$interface";;
37	   *)      zone_id="";;
38	esac
39        ( echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6 )
40	exit_status=$?
41      done
42
43      if [ $exit_status -eq 0 ]; then
44	to_commit="force"
45	commit_resolv_conf
46      fi
47    fi
48  fi
49}
50
51# Try to commit /var/run/resolv.conf.dhclient6 contents to
52# System Configuration framework's Dynamic Store.
53# Note this will be cleared by the next location change
54# or preempted by IPv4.
55#
56# The System Configuration agent "IPMonitor" gets the DNS configuration
57# from the IPv4 or IPv6 primary service in the Dynamic Store
58# (managed by configd).
59commit_resolv_conf() {
60  if [ -f /var/run/resolv.conf.dhclient6 ]; then
61    if [ -x /usr/sbin/scutil ]; then
62      serviceID=`echo show State:/Network/Global/IPv6 | \
63          /usr/sbin/scutil | \
64          awk '/PrimaryService/ { print $3 }'`
65      echo $serviceID
66      if [ x$serviceID = x ]; then
67        $LOGGER "Can't find the primary IPv6 service"
68      else
69        tmp=`mktemp SC_dhclient6.XXXXXXXXXX`
70        echo list | /usr/sbin/scutil > /tmp/$tmp
71        grep -q State:/Network/Service/$serviceID/DNS /tmp/$tmp
72        grep_status=$?
73        if [ $grep_status -eq 0 ]; then
74          $LOGGER "DNS service already set in primary IPv6 service"
75          rm /tmp/$tmp
76        else
77          res=/var/run/resolv.conf.dhclient6
78          cp /dev/null /tmp/$tmp
79          grep -q '^nameserver' $res
80          grep_status=$?
81          if [ $grep_status -eq 0 ]; then
82            echo d.add ServerAddresses '*' \
83                 `awk 'BEGIN { n="" } \
84                       /^nameserver/ { n=n " " $2 } \
85                       END { print n}' < $res` >> /tmp/$tmp
86          fi
87          grep -q '^search' $res
88          grep_status=$?
89          if [ $grep_status -eq 0 ]; then
90            echo d.add SearchDomains '*' \
91                 `sed 's/^search//' < $res` >> /tmp/$tmp
92          fi
93          echo set State:/Network/Service/$serviceID/DNS >> /tmp/$tmp
94          echo quit >> /tmp/$tmp
95          cat /tmp/$tmp
96          /usr/sbin/scutil < /tmp/$tmp
97          rm /tmp/$tmp
98        fi
99      fi
100    else
101      $LOGGER "Can't find SystemConfiguration tools."
102    fi
103  else
104    if [ $to_commit = force ]; then
105      $LOGGER "Can't find /var/run/resolv.conf.dhclient6"
106    fi
107  fi
108  to_commit="done"
109}
110
111# This function was largely borrowed from dhclient-script that
112# ships with Centos, authored by Jiri Popelka and David Cantrell
113# of Redhat. Thanks guys.
114add_ipv6_addr_with_DAD() {
115    ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} alias
116
117    if [ ${dad_wait_time} -le 0 ]
118    then
119        # if we're not waiting for DAD, assume we're good
120        return 0
121    fi
122
123    # Repeatedly test whether newly added address passed
124    # duplicate address detection (DAD)
125    for i in $(seq 1 ${dad_wait_time}); do
126        sleep 1 # give the DAD some time
127
128        addr=$(ifconfig ${interface} \
129            | grep "${new_ip6_address} prefixlen ${new_ip6_prefixlen}")
130
131        # tentative flag == DAD is still not complete
132        tentative=$(echo "${addr}" | grep tentative)
133        # dadfailed flag == address is already in use somewhere else
134        dadfailed=$(echo "${addr}" | grep duplicated)
135
136        if [ -n "${dadfailed}" ] ; then
137            # dad failed, remove the address
138            ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} -alias
139            exit_with_hooks 3
140        fi
141
142        if [ -z "${tentative}" ] ; then
143            if [ -n "${addr}" ]; then
144                # DAD is over
145                return 0
146            else
147                # address was auto-removed (or not added at all)
148                exit_with_hooks 3
149            fi
150        fi
151    done
152
153    return 0
154}
155
156# Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
157exit_with_hooks() {
158  exit_status=$1
159  if [ -f /etc/dhclient-exit-hooks ]; then
160    . /etc/dhclient-exit-hooks
161  fi
162# probably should do something with exit status of the local script
163  exit $exit_status
164}
165
166# Invoke the local dhcp client enter hooks, if they exist.
167if [ -f /etc/dhclient-enter-hooks ]; then
168  exit_status=0
169  . /etc/dhclient-enter-hooks
170  # allow the local script to abort processing of this state
171  # local script must set exit_status variable to nonzero.
172  if [ $exit_status -ne 0 ]; then
173    exit $exit_status
174  fi
175fi
176
177if [ x$reason = xMEDIUM ]; then
178  eval "ifconfig $interface $medium"
179  eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1
180  sleep 1
181  exit_with_hooks 0
182fi
183
184###
185### DHCPv6 Handlers
186###
187
188if [ x$reason = xPREINIT6 ]; then
189  # Ensure interface is up.
190  ifconfig ${interface} up
191
192  # We need to give the kernel some time to active interface
193  interface_up_wait_time=5
194  for i in $(seq 0 ${interface_up_wait_time})
195  do
196      ifconfig ${interface} | grep inactive &> /dev/null
197      if [ $? -ne 0 ]; then
198          break;
199      fi
200      sleep 1
201  done
202
203  # XXX: Remove any stale addresses from aborted clients.
204
205  # Wait for duplicate address detection for this interface if the
206  # --dad-wait-time parameter has been specified and is greater than
207  # zero.
208  if [ ${dad_wait_time} -gt 0 ]; then
209      # Check if any IPv6 address on this interface is marked as
210      # tentative.
211      ifconfig ${interface} | grep inet6 | grep tentative \
212          &> /dev/null
213      if [ $? -eq 0 ]; then
214          # Wait for duplicate address detection to complete or for
215          # the timeout specified as --dad-wait-time.
216          for i in $(seq 0 $dad_wait_time)
217          do
218              # We're going to poll for the tentative flag every second.
219              sleep 1
220              ifconfig ${interface} | grep inet6 | grep tentative \
221                  &> /dev/null
222              if [ $? -ne 0 ]; then
223                  break;
224              fi
225          done
226      fi
227  fi
228
229  exit_with_hooks 0
230fi
231
232if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ]; then
233    echo Prefix $reason old=${old_ip6_prefix} new=${new_ip6_prefix}
234
235    exit_with_hooks 0
236fi
237
238if [ x$reason = xBOUND6 ]; then
239  if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ]; then
240    exit_with_hooks 2;
241  fi
242
243  # Add address to interface, check for DAD if dad_wait_time > 0
244  add_ipv6_addr_with_DAD
245
246  # Check for nameserver options.
247  make_resolv_conf
248
249  exit_with_hooks 0
250fi
251
252if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ]; then
253  # Make sure nothing has moved around on us.
254
255  # Nameservers/domains/etc.
256  if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
257     [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ]; then
258    make_resolv_conf
259  fi
260
261  exit_with_hooks 0
262fi
263
264if [ x$reason = xDEPREF6 ]; then
265  if [ x${new_ip6_address} = x ]; then
266    exit_with_hooks 2;
267  fi
268
269  ifconfig ${interface} inet6 ${new_ip6_address} deprecated
270
271  exit_with_hooks 0
272fi
273
274if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ]; then
275  if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ]; then
276    exit_with_hooks 2;
277  fi
278
279  ifconfig ${interface} inet6 ${old_ip6_address}/${old_ip6_prefixlen} -alias
280
281  exit_with_hooks 0
282fi
283
284if [ $to_commit = yes ]; then
285  commit_resolv_conf
286fi
287
288exit_with_hooks 0
289