1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
|
#!/bin/bash
#
# dhclient-script: Network interface configuration script run by
# dhclient based on DHCP client communication
#
# Copyright (C) 2008-2014 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author(s): David Cantrell <dcantrell@redhat.com>
# Jiri Popelka <jpopelka@redhat.com>
#
# ----------
# This script is a rewrite/reworking on dhclient-script originally
# included as part of dhcp-970306:
# dhclient-script for Linux. Dan Halbert, March, 1997.
# Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
# Modified by David Cantrell <dcantrell@redhat.com> for Fedora and RHEL
#
# This script is found in EL 7 and used to fix local routing in EL 6.
# ----------
PATH=/bin:/usr/bin:/sbin
# scripts in dhclient.d/ use $SAVEDIR (#833054)
SAVEDIR=/var/lib/dhclient
LOGFACILITY="local7"
LOGLEVEL="notice"
ETCDIR="/etc/dhcp"
logmessage() {
msg="${1}"
logger -p ${LOGFACILITY}.${LOGLEVEL} -t "NET" "dhclient: ${msg}"
}
eventually_add_hostnames_domain_to_search() {
# For the case when hostname for this machine has a domain that is not in domain_search list
# 1) get a hostname with `ipcalc --hostname` or `hostname`
# 2) get the domain from this hostname
# 3) add this domain to search line in resolv.conf if it's not already
# there (domain list that we have recently added there is a parameter of this function)
# We can't do this directly when generating resolv.conf in make_resolv_conf(), because
# we need to first save the resolv.conf with obtained values before we can call `ipcalc --hostname`.
# See bug 637763
search="${1}"
if need_hostname; then
status=1
if [ -n "${new_ip_address}" ]; then
eval $(/bin/ipcalc --silent --hostname ${new_ip_address} ; echo "status=$?")
elif [ -n "${new_ip6_address}" ]; then
eval $(/bin/ipcalc --silent --hostname ${new_ip6_address} ; echo "status=$?")
fi
if [ ${status} -eq 0 ]; then
domain=$(echo $HOSTNAME | cut -s -d "." -f 2-)
fi
else
domain=$(hostname 2>/dev/null | cut -s -d "." -f 2-)
fi
if [ -n "${domain}" ] &&
[ ! "${domain}" = "localdomain" ] &&
[ ! "${domain}" = "localdomain6" ] &&
[ ! "${domain}" = "(none)" ] &&
[[ ! "${domain}" = *\ * ]]; then
is_in="false"
for s in ${search}; do
if [ "${s}" = "${domain}" ] ||
[ "${s}" = "${domain}." ]; then
is_in="true"
fi
done
if [ "${is_in}" = "false" ]; then
# Add domain name to search list (#637763)
sed -i -e "s/${search}/${search} ${domain}/" /etc/resolv.conf
fi
fi
}
make_resolv_conf() {
[ "${PEERDNS}" = "no" ] && return
if [ "${reason}" = "RENEW" ] &&
[ "${new_domain_name}" = "${old_domain_name}" ] &&
[ "${new_domain_name_servers}" = "${old_domain_name_servers}" ]; then
return
fi
if [ -n "${new_domain_name}" ] ||
[ -n "${new_domain_name_servers}" ] ||
[ -n "${new_domain_search}" ]; then
rscf="$(mktemp ${TMPDIR:-/tmp}/XXXXXX)"
[[ -z "${rscf}" ]] && return
echo "; generated by /usr/sbin/dhclient-script" > ${rscf}
if [ -n "${SEARCH}" ]; then
search="${SEARCH}"
else
if [ -n "${new_domain_search}" ]; then
# Remove instaces of \032 (#450042)
search="${new_domain_search//\\032/ }"
elif [ -n "${new_domain_name}" ]; then
# Note that the DHCP 'Domain Name Option' is really just a domain
# name, and that this practice of using the domain name option as
# a search path is both nonstandard and deprecated.
search="${new_domain_name}"
fi
fi
if [ -n "${search}" ]; then
echo "search ${search}" >> $rscf
fi
if [ -n "${RES_OPTIONS}" ]; then
echo "options ${RES_OPTIONS}" >> ${rscf}
fi
for nameserver in ${new_domain_name_servers} ; do
echo "nameserver ${nameserver}" >> ${rscf}
done
change_resolv_conf ${rscf}
rm -f ${rscf}
if [ -n "${search}" ]; then
eventually_add_hostnames_domain_to_search "${search}"
fi
elif [ -n "${new_dhcp6_name_servers}" ] ||
[ -n "${new_dhcp6_domain_search}" ]; then
rscf="$(mktemp ${TMPDIR:-/tmp}/XXXXXX)"
[[ -z "${rscf}" ]] && return
echo "; generated by /usr/sbin/dhclient-script" > ${rscf}
if [ -n "${SEARCH}" ]; then
search="${SEARCH}"
else
if [ -n "${new_dhcp6_domain_search}" ]; then
search="${new_dhcp6_domain_search//\\032/ }"
fi
fi
if [ -n "${search}" ]; then
echo "search ${search}" >> $rscf
fi
if [ -n "${RES_OPTIONS}" ]; then
echo "options ${RES_OPTIONS}" >> ${rscf}
fi
shopt -s nocasematch
for nameserver in ${new_dhcp6_name_servers} ; do
# If the nameserver has a link-local address
# add a <zone_id> (interface name) to it.
if [[ "$nameserver" =~ ^fe80:: ]]
then
zone_id="%${interface}"
else
zone_id=
fi
echo "nameserver ${nameserver}$zone_id" >> ${rscf}
done
shopt -u nocasematch
change_resolv_conf ${rscf}
rm -f ${rscf}
if [ -n "${search}" ]; then
eventually_add_hostnames_domain_to_search "${search}"
fi
fi
}
exit_with_hooks() {
exit_status="${1}"
if [ -x ${ETCDIR}/dhclient-exit-hooks ]; then
. ${ETCDIR}/dhclient-exit-hooks
fi
exit ${exit_status}
}
quad2num() {
if [ $# -eq 4 ]; then
let n="${1} << 24 | ${2} << 16 | ${3} << 8 | ${4}"
echo "${n}"
return 0
else
echo "0"
return 1
fi
}
ip2num() {
IFS="." quad2num ${1}
}
num2ip() {
let n="${1}"
let o1="(n >> 24) & 0xff"
let o2="(n >> 16) & 0xff"
let o3="(n >> 8) & 0xff"
let o4="n & 0xff"
echo "${o1}.${o2}.${o3}.${o4}"
}
get_network_address() {
# get network address for the given IP address and (netmask or prefix)
ip="${1}"
nm="${2}"
if [ -n "${ip}" -a -n "${nm}" ]; then
if [[ "${nm}" = *.* ]]; then
ipcalc -s -n ${ip} ${nm} | cut -d '=' -f 2
else
ipcalc -s -n ${ip}/${nm} | cut -d '=' -f 2
fi
fi
}
get_prefix() {
# get prefix for the given IP address and mask
ip="${1}"
nm="${2}"
if [ -n "${ip}" -a -n "${nm}" ]; then
ipcalc -s -p ${ip} ${nm} | cut -d '=' -f 2
fi
}
class_bits() {
let ip=$(IFS='.' ip2num $1)
let bits=32
let mask='255'
for ((i=0; i <= 3; i++, 'mask<<=8')); do
let v='ip&mask'
if [ "$v" -eq 0 ] ; then
let bits-=8
else
break
fi
done
echo $bits
}
is_router_reachable() {
# handle DHCP servers that give us a router not on our subnet
router="${1}"
routersubnet="$(get_network_address ${router} ${new_subnet_mask})"
mysubnet="$(get_network_address ${new_ip_address} ${new_subnet_mask})"
if [ ! "${routersubnet}" = "${mysubnet}" ]; then
ip -4 route replace ${router}/32 dev ${interface}
if [ "$?" -ne 0 ]; then
logmessage "failed to create host route for ${router}"
return 1
fi
fi
return 0
}
add_default_gateway() {
router="${1}"
if is_router_reachable ${router} ; then
metric=""
if [ $# -gt 1 ] && [ ${2} -gt 0 ]; then
metric="metric ${2}"
fi
ip -4 route replace default via ${router} dev ${interface} ${metric}
if [ $? -ne 0 ]; then
logmessage "failed to create default route: ${router} dev ${interface} ${metric}"
return 1
else
return 0
fi
fi
return 1
}
execute_client_side_configuration_scripts() {
# execute any additional client side configuration scripts we have
if [ "${1}" == "config" ] || [ "${1}" == "restore" ]; then
for f in ${ETCDIR}/dhclient.d/*.sh ; do
if [ -x ${f} ]; then
subsystem="${f%.sh}"
subsystem="${subsystem##*/}"
. ${f}
"${subsystem}_${1}"
fi
done
fi
}
flush_dev() {
# Instead of bringing the interface down (#574568)
# explicitly clear the ARP cache and flush all addresses & routes.
ip -4 addr flush dev ${1} >/dev/null 2>&1
ip -4 route flush dev ${1} >/dev/null 2>&1
ip -4 neigh flush dev ${1} >/dev/null 2>&1
}
dhconfig() {
if [ -n "${old_ip_address}" ] && [ -n "${alias_ip_address}" ] &&
[ ! "${alias_ip_address}" = "${old_ip_address}" ]; then
# possible new alias, remove old alias first
ip -4 addr del ${old_ip_address} dev ${interface} label ${interface}:0
fi
if [ -n "${old_ip_address}" ] &&
[ ! "${old_ip_address}" = "${new_ip_address}" ]; then
# IP address changed. Delete all routes, and clear the ARP cache.
flush_dev ${interface}
fi
if [ "${reason}" = "BOUND" ] || [ "${reason}" = "REBOOT" ] ||
[ ! "${old_ip_address}" = "${new_ip_address}" ] ||
[ ! "${old_subnet_mask}" = "${new_subnet_mask}" ] ||
[ ! "${old_network_number}" = "${new_network_number}" ] ||
[ ! "${old_broadcast_address}" = "${new_broadcast_address}" ] ||
[ ! "${old_routers}" = "${new_routers}" ] ||
[ ! "${old_interface_mtu}" = "${new_interface_mtu}" ]; then
ip -4 addr add ${new_ip_address}/${new_prefix} broadcast ${new_broadcast_address} dev ${interface} \
valid_lft ${new_dhcp_lease_time} preferred_lft ${new_dhcp_lease_time} >/dev/null 2>&1
ip link set dev ${interface} up
# The 576 MTU is only used for X.25 and dialup connections
# where the admin wants low latency. Such a low MTU can cause
# problems with UDP traffic, among other things. As such,
# disallow MTUs from 576 and below by default, so that broken
# MTUs are ignored, but higher stuff is allowed (1492, 1500, etc).
if [ -n "${new_interface_mtu}" ] && [ ${new_interface_mtu} -gt 576 ]; then
ip link set dev ${interface} mtu ${new_interface_mtu}
fi
# static routes
if [ -n "${new_classless_static_routes}" ] ||
[ -n "${new_static_routes}" ]; then
if [ -n "${new_classless_static_routes}" ]; then
IFS=', |' static_routes=(${new_classless_static_routes})
else
IFS=', |' static_routes=(${new_static_routes})
fi
route_targets=()
for((i=0; i<${#static_routes[@]}; i+=2)); do
target=${static_routes[$i]}
if [ -n "${new_classless_static_routes}" ]; then
if [ ${target} = "0" ]; then
# If the DHCP server returns both a Classless Static Routes option and
# a Router option, the DHCP client MUST ignore the Router option. (RFC3442)
new_routers=""
prefix="0"
else
prefix=${target%%.*}
target=${target#*.}
IFS="." target_arr=(${target})
unset IFS
((pads=4-${#target_arr[@]}))
for j in $(seq $pads); do
target="${target}.0"
done
# Client MUST zero any bits in the subnet number where the corresponding bit in the mask is zero.
# In other words, the subnet number installed in the routing table is the logical AND of
# the subnet number and subnet mask given in the Classless Static Routes option. (RFC3442)
target="$(get_network_address ${target} ${prefix})"
fi
else
prefix=$(class_bits ${target})
fi
gateway=${static_routes[$i+1]}
# special case 0.0.0.0 to allow static routing for link-local addresses
# (including IPv4 multicast) which will not have a next-hop (#769463, #787318)
if [ "${gateway}" = "0.0.0.0" ]; then
valid_gateway=0
scope='scope link'
else
is_router_reachable ${gateway}
valid_gateway=$?
scope=''
fi
if [ ${valid_gateway} -eq 0 ]; then
metric=''
for t in ${route_targets[@]}; do
if [ ${t} = ${target} ]; then
if [ -z "${metric}" ]; then
metric=1
else
((metric=metric+1))
fi
fi
done
if [ -n "${metric}" ]; then
metric="metric ${metric}"
fi
ip -4 route replace ${target}/${prefix} proto static via ${gateway} dev ${interface} ${metric} ${scope}
if [ $? -ne 0 ]; then
logmessage "failed to create static route: ${target}/${prefix} via ${gateway} dev ${interface} ${metric}"
else
route_targets=(${route_targets[@]} ${target})
fi
fi
done
fi
# gateways
if [[ ( "${DEFROUTE}" != "no" ) &&
(( -z "${GATEWAYDEV}" ) || ( "${GATEWAYDEV}" = "${interface}" )) ]]; then
if [[ ( -z "$GATEWAY" ) ||
(( -n "$DHCLIENT_IGNORE_GATEWAY" ) && ( "$DHCLIENT_IGNORE_GATEWAY" = [Yy]* )) ]]; then
metric="${METRIC:-}"
let i="${METRIC:-0}"
default_routers=()
for router in ${new_routers} ; do
added_router=-
for r in ${default_routers[@]} ; do
if [ "${r}" = "${router}" ]; then
added_router=1
fi
done
if [ -z "${router}" ] ||
[ "${added_router}" = "1" ] ||
[ $(IFS=. ip2num ${router}) -le 0 ] ||
[[ ( "${router}" = "${new_broadcast_address}" ) &&
( "${new_subnet_mask}" != "255.255.255.255" ) ]]; then
continue
fi
default_routers=(${default_routers[@]} ${router})
add_default_gateway ${router} ${metric}
let i=i+1
metric=${i}
done
elif [ -n "${GATEWAY}" ]; then
routersubnet=$(get_network_address ${GATEWAY} ${new_subnet_mask})
mysubnet=$(get_network_address ${new_ip_address} ${new_subnet_mask})
if [ "${routersubnet}" = "${mysubnet}" ]; then
ip -4 route replace default via ${GATEWAY} dev ${interface}
fi
fi
fi
else # RENEW||REBIND - only update address lifetimes
ip -4 addr change ${new_ip_address}/${new_prefix} broadcast ${new_broadcast_address} dev ${interface} \
valid_lft ${new_dhcp_lease_time} preferred_lft ${new_dhcp_lease_time} >/dev/null 2>&1
fi
if [ ! "${new_ip_address}" = "${alias_ip_address}" ] &&
[ -n "${alias_ip_address}" ]; then
# Reset the alias address (fix: this should really only do this on changes)
ip -4 addr flush dev ${interface} label ${interface}:0 >/dev/null 2>&1
ip -4 addr add ${alias_ip_address}/${alias_prefix} broadcast ${alias_broadcast_address} dev ${interface} label ${interface}:0
ip -4 route replace ${alias_ip_address}/32 dev ${interface}
fi
# After dhclient brings an interface UP with a new IP address, subnet mask,
# and routes, in the REBOOT/BOUND states -> search for "dhclient-up-hooks".
if [ "${reason}" = "BOUND" ] || [ "${reason}" = "REBOOT" ] ||
[ ! "${old_ip_address}" = "${new_ip_address}" ] ||
[ ! "${old_subnet_mask}" = "${new_subnet_mask}" ] ||
[ ! "${old_network_number}" = "${new_network_number}" ] ||
[ ! "${old_broadcast_address}" = "${new_broadcast_address}" ] ||
[ ! "${old_routers}" = "${new_routers}" ] ||
[ ! "${old_interface_mtu}" = "${new_interface_mtu}" ]; then
if [ -x ${ETCDIR}/dhclient-${interface}-up-hooks ]; then
. ${ETCDIR}/dhclient-${interface}-up-hooks
elif [ -x ${ETCDIR}/dhclient-up-hooks ]; then
. ${ETCDIR}/dhclient-up-hooks
fi
fi
make_resolv_conf
if [ -n "${new_host_name}" ] && need_hostname; then
hostname ${new_host_name} || echo "See -nc option in dhclient(8) man page."
fi
if [[ ( "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" = [yY1]* ) &&
( -n "${new_time_offset}" ) ]]; then
# DHCP option "time-offset" is requested by default and should be
# handled. The geographical zone abbreviation cannot be determined
# from the GMT offset, but the $ZONEINFO/Etc/GMT$offset file can be
# used - note: this disables DST.
((z=new_time_offset/3600))
((hoursWest=$(printf '%+d' $z)))
if (( $hoursWest < 0 )); then
# tzdata treats negative 'hours west' as positive 'gmtoff'!
((hoursWest*=-1))
fi
tzfile=/usr/share/zoneinfo/Etc/GMT$(printf '%+d' ${hoursWest})
if [ -e ${tzfile} ]; then
cp -fp ${tzfile} /etc/localtime
touch /etc/localtime
fi
fi
execute_client_side_configuration_scripts "config"
}
# Section 18.1.8. (Receipt of Reply Messages) of RFC 3315 says:
# The client SHOULD perform duplicate address detection on each of
# the addresses in any IAs it receives in the Reply message before
# using that address for traffic.
add_ipv6_addr_with_DAD() {
ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${interface} scope global valid_lft ${new_max_life} \
preferred_lft ${new_preferred_life}
# repeatedly test whether newly added address passed
# duplicate address detection (DAD)
for i in $(seq 5); do
sleep 1 # give the DAD some time
addr=$(ip -6 addr show dev ${interface} \
| grep ${new_ip6_address}/${new_ip6_prefixlen})
# tentative flag == DAD is still not complete
tentative=$(echo "${addr}" | grep tentative)
# dadfailed flag == address is already in use somewhere else
dadfailed=$(echo "${addr}" | grep dadfailed)
if [ -n "${dadfailed}" ] ; then
# address was added with valid_lft/preferred_lft 'forever', remove it
ip -6 addr del ${new_ip6_address}/${new_ip6_prefixlen} dev ${interface}
exit_with_hooks 3
fi
if [ -z "${tentative}" ] ; then
if [ -n "${addr}" ]; then
# DAD is over
return 0
else
# address was auto-removed (or not added at all)
exit_with_hooks 3
fi
fi
done
return 0
}
dh6config() {
if [ -n "${old_ip6_prefix}" ] ||
[ -n "${new_ip6_prefix}" ]; then
echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
exit_with_hooks 0
fi
case "${reason}" in
BOUND6)
if [ -z "${new_ip6_address}" ] ||
[ -z "${new_ip6_prefixlen}" ]; then
exit_with_hooks 2
fi
add_ipv6_addr_with_DAD
make_resolv_conf
;;
RENEW6|REBIND6)
if [[ -n "${new_ip6_address}" ]] &&
[[ -n "${new_ip6_prefixlen}" ]]; then
if [[ ! "${new_ip6_address}" = "${old_ip6_address}" ]]; then
add_ipv6_addr_with_DAD
else # only update address lifetimes
ip -6 addr change ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${interface} scope global valid_lft ${new_max_life} \
preferred_lft ${new_preferred_life}
fi
fi
if [ ! "${new_dhcp6_name_servers}" = "${old_dhcp6_name_servers}" ] ||
[ ! "${new_dhcp6_domain_search}" = "${old_dhcp6_domain_search}" ]; then
make_resolv_conf
fi
;;
DEPREF6)
if [ -z "${new_ip6_prefixlen}" ]; then
exit_with_hooks 2
fi
ip -6 addr change ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${interface} scope global preferred_lft 0
;;
esac
execute_client_side_configuration_scripts "config"
}
#
# ### MAIN
#
if [ -x ${ETCDIR}/dhclient-enter-hooks ]; then
exit_status=0
# dhclient-enter-hooks can abort dhclient-script by setting
# the exit_status variable to a non-zero value
. ${ETCDIR}/dhclient-enter-hooks
if [ ${exit_status} -ne 0 ]; then
exit ${exit_status}
fi
fi
if [ ! -r /etc/sysconfig/network-scripts/network-functions ]; then
echo "Missing /etc/sysconfig/network-scripts/network-functions, exiting." >&2
exit 1
fi
if [ ! -r /etc/rc.d/init.d/functions ]; then
echo "Missing /etc/rc.d/init.d/functions, exiting." >&2
exit 1
fi
. /etc/sysconfig/network-scripts/network-functions
. /etc/rc.d/init.d/functions
if [ -f /etc/sysconfig/network ]; then
. /etc/sysconfig/network
fi
if [ -f /etc/sysconfig/networking/network ]; then
. /etc/sysconfig/networking/network
fi
cd /etc/sysconfig/network-scripts
CONFIG="${interface}"
need_config ${CONFIG}
source_config >/dev/null 2>&1
new_prefix="$(get_prefix ${new_ip_address} ${new_subnet_mask})"
old_prefix="$(get_prefix ${old_ip_address} ${old_subnet_mask})"
alias_prefix="$(get_prefix ${alias_ip_address} ${alias_subnet_mask})"
case "${reason}" in
MEDIUM|ARPCHECK|ARPSEND)
# Do nothing
exit_with_hooks 0
;;
PREINIT)
if [ -n "${alias_ip_address}" ]; then
# Flush alias, its routes will disappear too.
ip -4 addr flush dev ${interface} label ${interface}:0 >/dev/null 2>&1
fi
# upstream dhclient-script removes (ifconfig $interface 0 up) old adresses in PREINIT,
# but we sometimes (#125298) need (for iSCSI/nfs root to have a dhcp interface) to keep the existing ip
# flush_dev ${interface}
ip link set dev ${interface} up
if [ -n "${DHCLIENT_DELAY}" ] && [ ${DHCLIENT_DELAY} -gt 0 ]; then
# We need to give the kernel some time to get the interface up.
sleep ${DHCLIENT_DELAY}
fi
exit_with_hooks 0
;;
PREINIT6)
# ensure interface is up
ip link set dev ${interface} up
# remove any stale addresses from aborted clients
ip -6 addr flush dev ${interface} scope global permanent
# we need a link-local address to be ready (not tentative)
for i in $(seq 50); do
linklocal=$(ip -6 addr show dev ${interface} scope link)
# tentative flag means DAD is still not complete
tentative=$(echo "${linklocal}" | grep tentative)
[[ -n "${linklocal}" && -z "${tentative}" ]] && exit_with_hooks 0
sleep 0.1
done
exit_with_hooks 0
;;
BOUND|RENEW|REBIND|REBOOT)
if [ -z "${interface}" ] || [ -z "${new_ip_address}" ]; then
exit_with_hooks 2
fi
if arping -D -q -c2 -I ${interface} ${new_ip_address}; then
dhconfig
exit_with_hooks 0
else # DAD failed, i.e. address is already in use
ARP_REPLY=$(arping -D -c2 -I ${interface} ${new_ip_address} | grep reply | awk '{print toupper($5)}' | cut -d "[" -f2 | cut -d "]" -f1)
OUR_MACS=$(ip link show | grep link | awk '{print toupper($2)}' | uniq)
if [[ "${OUR_MACS}" = *"${ARP_REPLY}"* ]]; then
# in RENEW the reply can come from our system, that's OK
dhconfig
exit_with_hooks 0
else
exit_with_hooks 1
fi
fi
;;
BOUND6|RENEW6|REBIND6|DEPREF6)
dh6config
exit_with_hooks 0
;;
EXPIRE6|RELEASE6|STOP6)
if [ -z "${old_ip6_address}" ] || [ -z "${old_ip6_prefixlen}" ]; then
exit_with_hooks 2
fi
ip -6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
dev ${interface}
execute_client_side_configuration_scripts "restore"
if [ -x ${ETCDIR}/dhclient-${interface}-down-hooks ]; then
. ${ETCDIR}/dhclient-${interface}-down-hooks
elif [ -x ${ETCDIR}/dhclient-down-hooks ]; then
. ${ETCDIR}/dhclient-down-hooks
fi
exit_with_hooks 0
;;
EXPIRE|FAIL|RELEASE|STOP)
execute_client_side_configuration_scripts "restore"
if [ -x ${ETCDIR}/dhclient-${interface}-down-hooks ]; then
. ${ETCDIR}/dhclient-${interface}-down-hooks
elif [ -x ${ETCDIR}/dhclient-down-hooks ]; then
. ${ETCDIR}/dhclient-down-hooks
fi
if [ -n "${alias_ip_address}" ]; then
# Flush alias
ip -4 addr flush dev ${interface} label ${interface}:0 >/dev/null 2>&1
fi
if [ -n "${old_ip_address}" ]; then
# Delete addresses/routes/arp cache.
flush_dev ${interface}
fi
if [ -n "${alias_ip_address}" ]; then
ip -4 addr add ${alias_ip_address}/${alias_prefix} broadcast ${alias_broadcast_address} dev ${interface} label ${interface}:0
ip -4 route replace ${alias_ip_address}/32 dev ${interface}
fi
exit_with_hooks 0
;;
TIMEOUT)
if [ -n "${new_routers}" ]; then
if [ -n "${alias_ip_address}" ]; then
ip -4 addr flush dev ${interface} label ${interface}:0 >/dev/null 2>&1
fi
ip -4 addr add ${new_ip_address}/${new_prefix} \
broadcast ${new_broadcast_address} dev ${interface} \
valid_lft ${new_dhcp_lease_time} preferred_lft ${new_dhcp_lease_time}
set ${new_routers}
if ping -q -c 1 -w 10 -I ${interface} ${1}; then
dhconfig
exit_with_hooks 0
fi
flush_dev ${interface}
exit_with_hooks 1
else
exit_with_hooks 1
fi
;;
*)
logmessage "unhandled state: ${reason}"
exit_with_hooks 1
;;
esac
exit_with_hooks 0
|