Gecko [ sachasauda.akalacademy.ac.in ]

Name	Size	Permission
accessdb	11.55 KB	-rwxr-xr-x
addgnupghome	3.05 KB	-rwxr-xr-x
addpart	19.69 KB	-rwxr-xr-x
adduser	134.39 KB	-rwxr-xr-x
agetty	48.48 KB	-rwxr-xr-x
alternatives	27.61 KB	-rwxr-xr-x
anacron	35.52 KB	-rwxr-xr-x
apachectl	4.31 KB	-rwxr-xr-x
applygnupgdefaults	2.21 KB	-rwxr-xr-x
arp	63.98 KB	-rwxr-xr-x
arpd	52.98 KB	-rwxr-xr-x
arping	23.19 KB	-rwxr-xr-x
atd	27.17 KB	-rwxr-xr-x
atrun	67 B	-rwxr-xr-x
audispd	39.75 KB	-rwxr-xr-x
auditctl	39.56 KB	-rwxr-xr-x
auditd	125.65 KB	-rwxr-xr-x
augenrules	3.7 KB	-rwxr-xr-x
aureport	105.39 KB	-rwxr-xr-x
ausearch	109.8 KB	-rwxr-xr-x
authconfig	43.49 KB	-rwxr-xr-x
authconfig-tui	43.49 KB	-rwxr-xr-x
autrace	15.49 KB	-rwxr-x---
avcstat	11.25 KB	-rwxr-xr-x
badblocks	27.69 KB	-rwxr-xr-x
biosdecode	24.15 KB	-rwxr-xr-x
biosdevname	36.57 KB	-rwxr-xr-x
blkdeactivate	15.97 KB	-r-xr-xr-x
blkdiscard	23.84 KB	-rwxr-xr-x
blkid	77.92 KB	-rwxr-xr-x
blkmapd	43.81 KB	-rwxr-xr-x
blockdev	32.2 KB	-rwxr-xr-x
bridge	77.61 KB	-rwxr-xr-x
btrfs	690.59 KB	-rwxr-xr-x
btrfs-convert	378.62 KB	-rwxr-xr-x
btrfs-debug-tree	354.23 KB	-rwxr-xr-x
btrfs-find-root	346.22 KB	-rwxr-xr-x
btrfs-image	374.63 KB	-rwxr-xr-x
btrfs-map-logical	350.27 KB	-rwxr-xr-x
btrfs-select-super	346.2 KB	-rwxr-xr-x
btrfs-zero-log	346.2 KB	-rwxr-xr-x
btrfsck	690.59 KB	-rwxr-xr-x
btrfstune	350.24 KB	-rwxr-xr-x
build-locale-archive	860.52 KB	-rwx------
cacertdir_rehash	644 B	-rwxr-xr-x
capsh	19.43 KB	-rwxr-xr-x
cbq	32.73 KB	-rwxr-xr-x
cfdisk	71.37 KB	-rwxr-xr-x
chcpu	23.7 KB	-rwxr-xr-x
chgpasswd	64.1 KB	-rwxr-xr-x
chkconfig	40.22 KB	-rwxr-xr-x
chpasswd	55.88 KB	-rwxr-xr-x
chronyd	263.08 KB	-rwxr-xr-x
chroot	32.48 KB	-rwxr-xr-x
clock	48.44 KB	-rwxr-xr-x
clockdiff	19.04 KB	-rwxr-xr-x
consoletype	6.95 KB	-rwxr-xr-x
convertquota	70.88 KB	-rwxr-xr-x
cracklib-check	7.04 KB	-rwxr-xr-x
cracklib-format	246 B	-rwxr-xr-x
cracklib-packer	11.06 KB	-rwxr-xr-x
cracklib-unpacker	7.02 KB	-rwxr-xr-x
create-cracklib-dict	990 B	-rwxr-xr-x
crond	68.48 KB	-rwxr-xr-x
ctrlaltdel	11.2 KB	-rwxr-xr-x
ctstat	20.09 KB	-rwxr-xr-x
ddns-confgen	19.44 KB	-rwxr-xr-x
debugfs	120.64 KB	-rwxr-xr-x
delpart	19.69 KB	-rwxr-xr-x
depmod	143.24 KB	-rwxr-xr-x
devlink	64.72 KB	-rwxr-xr-x
dhclient	414.34 KB	-rwxr-xr-x
dhclient-script	30.38 KB	-rwxr-xr-x
dmfilemapd	19.16 KB	-r-xr-xr-x
dmidecode	120.2 KB	-rwxr-xr-x
dmsetup	149.2 KB	-r-xr-xr-x
dmstats	149.2 KB	-r-xr-xr-x
dnssec-checkds	922 B	-rwxr-xr-x
dnssec-coverage	924 B	-rwxr-xr-x
dnssec-dsfromkey	56.6 KB	-rwxr-xr-x
dnssec-importkey	52.59 KB	-rwxr-xr-x
dnssec-keyfromlabel	60.52 KB	-rwxr-xr-x
dnssec-keygen	64.55 KB	-rwxr-xr-x
dnssec-keymgr	920 B	-rwxr-xr-x
dnssec-revoke	48.45 KB	-rwxr-xr-x
dnssec-settime	56.52 KB	-rwxr-xr-x
dnssec-signzone	105.7 KB	-rwxr-xr-x
dnssec-verify	48.46 KB	-rwxr-xr-x
dovecot	370.66 KB	-rwxr-xr-x
dovecot_cpshutdown	3.27 KB	-rwxr-xr-x
dracut	55.83 KB	-rwxr-xr-x
dumpe2fs	23.62 KB	-rwxr-xr-x
e2freefrag	11.15 KB	-rwxr-xr-x
e2fsck	250.55 KB	-rwxr-xr-x
e2image	27.85 KB	-rwxr-xr-x
e2label	69.41 KB	-rwxr-xr-x
e2undo	11.32 KB	-rwxr-xr-x
e4defrag	23.55 KB	-rwxr-xr-x
eapol_test	1.77 MB	-rwxr-xr-x
ebtables	6.85 KB	-rwxr-xr-x
ebtables-restore	10.88 KB	-rwxr-xr-x
ebtables-save	851 B	-rwxr-xr-x
edquota	83.09 KB	-rwxr-xr-x
ether-wake	73.26 KB	-rwxr-xr-x
ethtool	293.87 KB	-rwxr-xr-x
exicyclog	11.01 KB	-rwxr-xr-x
exigrep	10.44 KB	-rwxr-xr-x
exim	1.33 MB	-rwsr-xr-x
exim_checkaccess	4.73 KB	-rwxr-xr-x
exim_dbmbuild	82.09 KB	-rwxr-xr-x
exim_dumpdb	134.47 KB	-rwxr-xr-x
exim_fixdb	168.22 KB	-rwxr-xr-x
exim_lock	64.66 KB	-rwxr-xr-x
exim_tidydb	142.8 KB	-rwxr-xr-x
eximstats	148.01 KB	-rwxr-xr-x
exinext	8.02 KB	-rwxr-xr-x
exiqgrep	5.46 KB	-rwxr-xr-x
exiqsumm	5.07 KB	-rwxr-xr-x
exiwhat	4.32 KB	-rwxr-xr-x
exportfs	76.91 KB	-rwxr-xr-x
faillock	15.02 KB	-rwxr-xr-x
fcgistarter	23.85 KB	-rwxr-xr-x
fdformat	11.27 KB	-rwxr-xr-x
fdisk	195.8 KB	-rwxr-xr-x
filefrag	15.23 KB	-rwxr-xr-x
findfs	11.2 KB	-rwxr-xr-x
firewalld	6.87 KB	-rwxr-xr-x
fixfiles	11.03 KB	-rwxr-xr-x
fsck	32.12 KB	-rwxr-xr-x
fsck.btrfs	1.16 KB	-rwxr-xr-x
fsck.cramfs	19.57 KB	-rwxr-xr-x
fsck.ext2	250.55 KB	-rwxr-xr-x
fsck.ext3	250.55 KB	-rwxr-xr-x
fsck.ext4	250.55 KB	-rwxr-xr-x
fsck.minix	73.32 KB	-rwxr-xr-x
fsck.xfs	433 B	-rwxr-xr-x
fsfreeze	11.23 KB	-rwxr-xr-x
fstrim	40.59 KB	-rwxr-xr-x
fuser	32.34 KB	-rwxr-xr-x
fxload	19.26 KB	-rwxr-xr-x
genhomedircon	23.77 KB	-rwxr-xr-x
genhostid	6.94 KB	-rwxr-xr-x
genl	52.81 KB	-rwxr-xr-x
genl-ctrl-list	11.27 KB	-rwxr-xr-x
genrandom	11.16 KB	-rwxr-xr-x
getcap	11.13 KB	-rwxr-xr-x
getenforce	7.01 KB	-rwxr-xr-x
getpcaps	7.07 KB	-rwxr-xr-x
getsebool	11.13 KB	-rwxr-xr-x
glibc_post_upgrade.x86_64	772.05 KB	-rwx------
groupadd	85.65 KB	-rwxr-xr-x
groupdel	77.38 KB	-rwxr-xr-x
groupmems	55.97 KB	-rwxr-xr-x
groupmod	85.66 KB	-rwxr-xr-x
grpck	59.93 KB	-rwxr-xr-x
grpconv	51.73 KB	-rwxr-xr-x
grpunconv	51.73 KB	-rwxr-xr-x
grub2-bios-setup	1.03 MB	-rwxr-xr-x
grub2-get-kernel-settings	2.08 KB	-rwxr-xr-x
grub2-install	1.29 MB	-rwxr-xr-x
grub2-macbless	1.02 MB	-rwxr-xr-x
grub2-mkconfig	7.63 KB	-rwxr-xr-x
grub2-ofpathname	225.54 KB	-rwxr-xr-x
grub2-probe	1.03 MB	-rwxr-xr-x
grub2-reboot	4 KB	-rwxr-xr-x
grub2-rpm-sort	258.52 KB	-rwxr-xr-x
grub2-set-default	3.46 KB	-rwxr-xr-x
grub2-setpassword	2.96 KB	-rwxr-xr-x
grub2-sparc64-setup	1.04 MB	-rwxr-xr-x
grubby	71.27 KB	-rwxr-xr-x
gss-server	23.13 KB	-rwxr-xr-x
gssproxy	130.64 KB	-rwxr-xr-x
halt	704.8 KB	-rwxr-xr-x
hardlink	15.29 KB	-rwxr-xr-x
htcacheclean	78.45 KB	-rwxr-xr-x
httpd	2.31 MB	-rwxr-xr-x
hwclock	48.44 KB	-rwxr-xr-x
iconvconfig	22.15 KB	-rwxr-xr-x
iconvconfig.x86_64	22.15 KB	-rwxr-xr-x
ifcfg	2.99 KB	-rwxr-xr-x
ifconfig	80.05 KB	-rwxr-xr-x
ifdown	1.61 KB	-rwxr-xr-x
ifenslave	19.74 KB	-rwxr-xr-x
ifstat	40.6 KB	-rwxr-xr-x
ifup	4.89 KB	-rwxr-xr-x
imunify-notifier	8.63 MB	-rwxr-xr-x
init	1.56 MB	-rwxr-xr-x
insmod	143.24 KB	-rwxr-xr-x
install-info	110.42 KB	-rwxr-xr-x
installkernel	2.69 KB	-rwxr-xr-x
intel-microcode2ucode	11.1 KB	-rwxr-xr-x
ip	459.59 KB	-rwxr-xr-x
ip6tables	91.52 KB	-rwxr-xr-x
ip6tables-restore	91.52 KB	-rwxr-xr-x
ip6tables-save	91.52 KB	-rwxr-xr-x
ipmaddr	19.33 KB	-rwxr-xr-x
iprconfig	394.37 KB	-rwxr-xr-x
iprdbg	135.94 KB	-rwx------
iprdump	123.67 KB	-rwxr-xr-x
iprinit	123.64 KB	-rwxr-xr-x
iprsos	2.18 KB	-rwxr-xr-x
iprupdate	123.64 KB	-rwxr-xr-x
ipset	7.02 KB	-rwxr-xr-x
iptables	91.52 KB	-rwxr-xr-x
iptables-restore	91.52 KB	-rwxr-xr-x
iptables-save	91.52 KB	-rwxr-xr-x
iptunnel	23.33 KB	-rwxr-xr-x
irqbalance	48.5 KB	-rwxr-xr-x
isc-hmac-fixup	11.2 KB	-rwxr-xr-x
kexec	166.06 KB	-rwxr-xr-x
key.dns_resolver	19.45 KB	-rwxr-xr-x
killall5	23.17 KB	-rwxr-xr-x
kpartx	39.47 KB	-rwxr-xr-x
lchage	15.41 KB	-rwxr-xr-x
ldattach	27.93 KB	-rwxr-xr-x
ldconfig	952.08 KB	-rwxr-xr-x
lgroupadd	11.28 KB	-rwxr-xr-x
lgroupdel	11.26 KB	-rwxr-xr-x
lgroupmod	15.44 KB	-rwxr-xr-x
lid	15.4 KB	-rwxr-xr-x
lnewusers	15.46 KB	-rwxr-xr-x
lnstat	20.09 KB	-rwxr-xr-x
load_policy	10.97 KB	-rwxr-xr-x
logrotate	68.61 KB	-rwxr-xr-x
logsave	11.27 KB	-rwxr-xr-x
losetup	82.45 KB	-rwxr-xr-x
lpasswd	15.5 KB	-rwxr-xr-x
lsmod	143.24 KB	-rwxr-xr-x
lsof	150.57 KB	-rwxr-xr-x
luseradd	15.38 KB	-rwxr-xr-x
luserdel	11.3 KB	-rwxr-xr-x
lusermod	19.43 KB	-rwxr-xr-x
lwresd	768.18 KB	-rwxr-xr-x
makedumpfile	376.52 KB	-rwxr-xr-x
matchpathcon	11.19 KB	-rwxr-xr-x
mii-diag	20.08 KB	-rwxr-xr-x
mii-tool	19.51 KB	-rwxr-xr-x
mkdict	246 B	-rwxr-xr-x
mkdumprd	13.99 KB	-rwxr-xr-x
mke2fs	94.08 KB	-rwxr-xr-x
mkfs	11.25 KB	-rwxr-xr-x
mkfs.btrfs	366.45 KB	-rwxr-xr-x
mkfs.cramfs	36.16 KB	-rwxr-xr-x
mkfs.ext2	94.08 KB	-rwxr-xr-x
mkfs.ext3	94.08 KB	-rwxr-xr-x
mkfs.ext4	94.08 KB	-rwxr-xr-x
mkfs.minix	36.27 KB	-rwxr-xr-x
mkfs.xfs	359.8 KB	-rwxr-xr-x
mkhomedir_helper	19.05 KB	-rwxr-xr-x
mklost+found	11.11 KB	-rwxr-xr-x
mkswap	69.64 KB	-rwxr-xr-x
modinfo	143.24 KB	-rwxr-xr-x
modprobe	143.24 KB	-rwxr-xr-x
modsec-sdbm-util	22.17 KB	-rwxr-x---
mount.nfs	114.68 KB	-rwsr-xr-x
mount.nfs4	114.68 KB	-rwsr-xr-x
mountstats	40.59 KB	-rwxr-xr-x
mysqld	244.14 MB	-rwxr-xr-x
mysqld-debug	165.52 MB	-rwxr-xr-x
named	768.18 KB	-rwxr-xr-x
named-checkconf	32.25 KB	-rwxr-xr-x
named-checkzone	32.06 KB	-rwxr-xr-x
named-compilezone	32.06 KB	-rwxr-xr-x
named-journalprint	11.13 KB	-rwxr-xr-x
nameif	15.32 KB	-rwxr-xr-x
netreport	10.96 KB	-rwxr-sr-x
new-kernel-pkg	24.96 KB	-rwxr-xr-x
newusers	93.45 KB	-rwxr-xr-x
nfsdcltrack	40.11 KB	-rwxr-xr-x
nfsidmap	19.32 KB	-rwxr-xr-x
nfsiostat	23.64 KB	-rwxr-xr-x
nfsstat	29.84 KB	-rwxr-xr-x
nl-class-add	11.7 KB	-rwxr-xr-x
nl-class-delete	11.55 KB	-rwxr-xr-x
nl-class-list	11.48 KB	-rwxr-xr-x
nl-classid-lookup	11.29 KB	-rwxr-xr-x
nl-cls-add	11.76 KB	-rwxr-xr-x
nl-cls-delete	11.68 KB	-rwxr-xr-x
nl-cls-list	11.58 KB	-rwxr-xr-x
nl-link-list	11.52 KB	-rwxr-xr-x
nl-pktloc-lookup	11.36 KB	-rwxr-xr-x
nl-qdisc-add	11.6 KB	-rwxr-xr-x
nl-qdisc-delete	11.54 KB	-rwxr-xr-x
nl-qdisc-list	11.63 KB	-rwxr-xr-x
nologin	7.01 KB	-rwxr-xr-x
nscd	180.02 KB	-rwxr-xr-x
nsec3hash	11.13 KB	-rwxr-xr-x
nstat	23.88 KB	-rwxr-xr-x
osd_login	2.55 KB	-rwxr-xr-x
ownership	15.04 KB	-rwxr-xr-x
packer	11.06 KB	-rwxr-xr-x
pam_console_apply	39.69 KB	-rwxr-xr-x
pam_tally2	15.05 KB	-rwxr-xr-x
pam_timestamp_check	10.97 KB	-rwsr-xr-x
paperconfig	4.07 KB	-rwxr-xr-x
parted	77.22 KB	-rwxr-xr-x
partprobe	11.23 KB	-rwxr-xr-x
partx	86.55 KB	-rwxr-xr-x
pdns_server	98.68 MB	-rwxr-xr-x
pidof	23.17 KB	-rwxr-xr-x
ping6	64.63 KB	-rwxr-xr-x
pivot_root	11.19 KB	-rwxr-xr-x
plipconfig	11.06 KB	-rwxr-xr-x
pluginviewer	15.23 KB	-rwxr-xr-x
plymouth-set-default-theme	6.21 KB	-rwxr-xr-x
plymouthd	84.22 KB	-rwxr-xr-x
poweroff	704.8 KB	-rwxr-xr-x
ppp-watch	23.2 KB	-rwxr-xr-x
pure-authd	18.37 KB	-rwxr-xr-x
pure-certd	18.27 KB	-rwxr-xr-x
pure-config.pl	4.64 KB	-rwxr-xr-x
pure-ftpd	173.28 KB	-rwxr-xr-x
pure-ftpwho	25.96 KB	-rwxr-xr-x
pure-mrtginfo	9.93 KB	-rwxr-xr-x
pure-quotacheck	13.95 KB	-rwxr-xr-x
pure-uploadscript	14.21 KB	-rwxr-xr-x
pwck	51.71 KB	-rwxr-xr-x
pwconv	47.57 KB	-rwxr-xr-x
pwhistory_helper	15.44 KB	-rwxr-xr-x
pwunconv	47.59 KB	-rwxr-xr-x
quot	70.66 KB	-rwxr-xr-x
quotacheck	107.29 KB	-rwxr-xr-x
quotaoff	75.03 KB	-rwxr-xr-x
quotaon	75.03 KB	-rwxr-xr-x
quotastats	14.03 KB	-rwxr-xr-x
rdisc	23.17 KB	-rwxr-xr-x
rdma	73.42 KB	-rwxr-xr-x
readprofile	15.46 KB	-rwxr-xr-x
reboot	704.8 KB	-rwxr-xr-x
repquota	75.16 KB	-rwxr-xr-x
request-key	19.41 KB	-rwxr-xr-x
resize2fs	48.41 KB	-rwxr-xr-x
resizepart	32.36 KB	-rwxr-xr-x
restorecon	27.16 KB	-rwxr-xr-x
rmmod	143.24 KB	-rwxr-xr-x
rndc	35.88 KB	-rwxr-xr-x
rndc-confgen	19.44 KB	-rwxr-xr-x
rotatelogs	53 KB	-rwxr-xr-x
route	66.6 KB	-rwxr-xr-x
routef	173 B	-rwxr-xr-x
routel	1.59 KB	-rwxr-xr-x
rpc.gssd	88.73 KB	-rwxr-xr-x
rpc.idmapd	48.13 KB	-rwxr-xr-x
rpc.mountd	128.91 KB	-rwxr-xr-x
rpc.nfsd	40.2 KB	-rwxr-xr-x
rpc.rquotad	78.95 KB	-rwxr-xr-x
rpc.statd	97.59 KB	-rwxr-xr-x
rpcbind	60.07 KB	-rwxr-xr-x
rpcdebug	18.05 KB	-rwxr-xr-x
rpcinfo	27.3 KB	-rwxr-xr-x
rsyslogd	648.45 KB	-rwxr-xr-x
rtacct	41.93 KB	-rwxr-xr-x
rtcwake	31.96 KB	-rwxr-xr-x
rtmon	48.67 KB	-rwxr-xr-x
rtpr	37 B	-rwxr-xr-x
rtstat	20.09 KB	-rwxr-xr-x
runlevel	704.8 KB	-rwxr-xr-x
runq	1.33 MB	-rwsr-xr-x
runuser	32.21 KB	-rwxr-xr-x
safe_finger	11.08 KB	-rwxr-xr-x
saslauthd	92.59 KB	-rwxr-xr-x
sasldblistusers2	19.26 KB	-rwxr-xr-x
saslpasswd2	15.09 KB	-rwxr-xr-x
sefcontext_compile	60.53 KB	-rwxr-xr-x
selabel_digest	11.17 KB	-rwxr-xr-x
selabel_lookup	11.14 KB	-rwxr-xr-x
selabel_lookup_best_match	11.16 KB	-rwxr-xr-x
selabel_partial_match	11.09 KB	-rwxr-xr-x
selinux_restorecon	15.21 KB	-rwxr-xr-x
selinuxconlist	11.1 KB	-rwxr-xr-x
selinuxdefcon	11.12 KB	-rwxr-xr-x
selinuxenabled	6.98 KB	-rwxr-xr-x
selinuxexeccon	7.09 KB	-rwxr-xr-x
semanage	42.76 KB	-rwxr-xr-x
semodule	23.77 KB	-rwxr-xr-x
sendmail	13.48 KB	-rwxr-sr-x
service	3.17 KB	-rwxr-xr-x
sestatus	15.02 KB	-rwxr-xr-x
setcap	11.13 KB	-rwxr-xr-x
setenforce	7.05 KB	-rwxr-xr-x
setfiles	27.16 KB	-rwxr-xr-x
setquota	83.16 KB	-rwxr-xr-x
setsebool	14.99 KB	-rwxr-xr-x
sfdisk	83.25 KB	-rwxr-xr-x
showmount	19.56 KB	-rwxr-xr-x
shutdown	704.8 KB	-rwxr-xr-x
sim_server	10.97 KB	-rwxr-xr-x
slattach	42.4 KB	-rwxr-xr-x
sln	743.78 KB	-rwxr-xr-x
sm-notify	68.43 KB	-rwxr-xr-x
smartctl	864.48 KB	-rwxr-xr-x
smartd	670.63 KB	-rwxr-xr-x
snmpd	31.05 KB	-rwxr-xr-x
snmptrapd	31.22 KB	-rwxr-xr-x
ss	128.44 KB	-rwxr-xr-x
sshd	836.91 KB	-rwxr-xr-x
sshd-keygen	3.53 KB	-rwxr-xr-x
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tc	384.66 KB	-rwxr-xr-x
tcpd	36.62 KB	-rwxr-xr-x
tcpdmatch	40.83 KB	-rwxr-xr-x
tcpdump	920.16 KB	-rwxr-xr-x
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telinit	704.8 KB	-rwxr-xr-x
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wpa_cli	128.06 KB	-rwxr-xr-x
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wpa_supplicant	1.93 MB	-rwxr-xr-x
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xfs_logprint	355.81 KB	-rwxr-xr-x
xfs_mdrestore	314.81 KB	-rwxr-xr-x
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xtables-multi	91.52 KB	-rwxr-xr-x
yum-complete-transaction	9.22 KB	-rwxr-xr-x
yumdb	8.67 KB	-rwxr-xr-x
zdump	14.02 KB	-rwxr-xr-x
zic	50.02 KB	-rwxr-xr-x
zramctl	82.23 KB	-rwxr-xr-x

Code Editor : dhclient-script

#!/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
# ----------
#

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="${1}"
    if need_hostname; then
        status=1
        OLD_HOSTNAME=${HOSTNAME}
        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 $HOSTNAME | cut -s -d "." -f 2-)
        fi
        HOSTNAME=${OLD_HOSTNAME}
    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

if [ -n "${new_domain_name_servers}" ]; then
            for nameserver in ${new_domain_name_servers} ; do
                echo "nameserver ${nameserver}" >> "${rscf}"
            done
        else # keep 'old' nameservers
            sed -n /^\w*[Nn][Aa][Mm][Ee][Ss][Ee][Rr][Vv][Ee][Rr]/p /etc/resolv.conf >> "${rscf}"
        fi

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
        if [ -n "${new_dhcp6_name_servers}" ]; then
            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" >> "${rscf}"
            done
        else # keep 'old' nameservers
            sed -n /^\w*[Nn][Aa][Mm][Ee][Ss][Ee][Rr][Vv][Ee][Rr]/p /etc/resolv.conf >> "${rscf}"
        fi
        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

if [ -d ${ETCDIR}/dhclient-exit-hooks.d ]; then
        for f in ${ETCDIR}/dhclient-exit-hooks.d/*.sh ; do
            if [ -x ${f} ]; then
                . ${f}
            fi
        done
    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

# make sure the interface is up
    ip link set dev ${interface} up

# replace = add if it doesn't exist or override (update lifetimes) if it's there
    ip -4 addr replace ${new_ip_address}/${new_prefix} broadcast ${new_broadcast_address} dev ${interface} \
       valid_lft ${new_dhcp_lease_time} preferred_lft ${new_dhcp_lease_time} >/dev/null 2>&1

if [ "${reason}" = "BOUND" ] || [ "${reason}" = "REBOOT" ] ||
       [ ! "${old_classless_static_routes}" = "${new_classless_static_routes}" ] ||
       [ ! "${old_static_routes}" = "${new_static_routes}" ] ||
       [ ! "${old_ip_address}" = "${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
        
        # 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

# Remove old static routes if no new static routes are provided
        if [ -n "${old_classless_static_routes}" ] ||
           [ -n "${old_static_routes}" ]; then
            remove_routes=0
            if [ -n "${old_classless_static_routes}" ]; then
                if [ -z "${new_classless_static_routes}" ]; then
                        IFS=', |' old_static_routes=(${old_classless_static_routes})
                        remove_routes=1
                fi
            else
                if [ -z "${new_static_routes}" ]; then
                        IFS=', |' old_static_routes=(${old_static_routes})
                        remove_routes=1
                fi
            fi
            if [ $remove_routes = "1" ] ; then
                for((i=0; i<${#old_static_routes[@]}; i+=2)); do
                    old_target=${old_static_routes[$i]}
                    old_prefix=$(echo ${old_target} | cut -d "." -f 1)
                    old_target=$(echo ${old_target} | cut -d "." -f 2-)
                    old_gateway=${old_static_routes[$i+1]}
                    ip -4 route del ${old_target}/${old_prefix} proto static via ${old_gateway} dev ${interface}
                done
            fi
        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})
		# 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=""
            else
                IFS=', |' static_routes=(${new_static_routes})
            fi
            route_targets=()

# Remove old static routes if no matching target is provided in the new static routes
            if [ -n "${old_classless_static_routes}" ] ||
               [ -n "${old_static_routes}" ]; then
                if [ -n "${old_classless_static_routes}" ]; then
                    IFS=', |' old_static_routes=(${old_classless_static_routes})
                else
                    IFS=', |' old_static_routes=(${old_static_routes})
                fi
                for((i=0; i<${#old_static_routes[@]}; i+=2)); do
                    old_target=${old_static_routes[$i]}
                    remove_route=1
                    for((j=0; j<${#static_routes[@]}; j+=2)); do
                        if [ $old_target = ${static_routes[$j]} ]; then
                            remove_route=0
                        fi
                    done
                    old_prefix=$(echo ${old_target} | cut -d "." -f 1)
                    old_target=$(echo ${old_target} | cut -d "." -f 2-)
                    old_gateway=${old_static_routes[$i+1]}
                    if [ $remove_route = "1" ]; then
                        ip -4 route del ${old_target}/${old_prefix} proto static via ${old_gateway} dev ${interface}
                    fi
                done
            fi
            
            for((i=0; i<${#static_routes[@]}; i+=2)); do
                target=${static_routes[$i]}
                if [ -n "${new_classless_static_routes}" ]; then
		    if [ ${target} = "0" ]; then
                        new_routers="${static_routes[$i+1]}"
                        continue
                    else
                        prefix=${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
    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 replace ${alias_ip_address}/${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 replace ${new_ip6_address}/${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
		   [[ -n "${old_ip6_address}" ]] && ip -6 addr del ${old_ip6_address} dev ${interface}
                   add_ipv6_addr_with_DAD
               fi
               # call it even if new_ip6_address = old_ip6_address to update lifetimes
               add_ipv6_addr_with_DAD
             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 [ -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 replace ${alias_ip_address}/${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 replace ${new_ip_address}/${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

${this.title}

Code Editor : dhclient-script