....................................../////.===Shadow-Here===./////................................................ > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < ------------------------------------------------------------------------------------------------------------------- /////////////////////////////////////////////////////////////////////////////////////////////////////////////////// RIFF¤ WEBPVP8 ˜ ðÑ *ôô>‘HŸK¥¤"§£±¨àð enü¹%½_F‘åè¿2ºQú³íªú`N¿­3ÿƒügµJžaÿ¯ÿ°~¼ÎùnúîÞÖô•òíôÁÉß®Sm¥Ü/ ‡ó˜f£Ùà<˜„xëJ¢Ù€SO3x<ªÔ©4¿+ç¶A`q@Ì“Úñè™ÍÿJÌ´ª-˜ÆtÊÛL]Ïq*‘Ý”ì#ŸÌÏãY]@ê`¿ /ªfkØB4·®£ó z—Üw¥Pxù–ÞLШKÇN¾AkÙTf½è'‰g gÆv›Øuh~ a˜Z— ïj*á¥t d£“uÒ ¨`K˜¹ßþ]b>˜]_ÏÔ6W—è2r4x•íÖ…"ƒÖNîä!¦å Ú}ýxGøÌ —@ ;ÆÚŠ=ɾ1ý8lªË¥ô ^yf®Œ¢u&2©nÙÇ›ñÂñŒ³ aPo['½»øFùà­+4ê“$!lövlüÞ=;N®3ð‚õ›DÉKòÞ>ÄÍ ¥ˆuߤ#ˆ$6ù™¥îŠ‡y’ÍB¼ çxÛ;X"WL£R÷͝*ó-¶Zu}º.s¸sšXqù–DþÿvªhüïwyŸ ¯é³lÀ:KCûÄ£Ëá\…­ ~—ýóî ¼ûûÜTÓüÇy…ŽÆvc»¾×U ñ¸žþоP÷¦ó:Ò¨¨5;Ð#&#ÖúñläÿÁœ GxÉ­/ñ‡áQðìYÉtÒwŽ¼GÔ´zàÒò ð*ëzƒ•4~H]Ø‹f ñÓÈñ`NåWçs'ÆÏW^ø¹!XžµmQ5ÃËoLœÎ: ÞËÍ¥J ù…î èo£ßPÎñ¶ž8.Œ]ʵ~5›ÙË-ù*8ÙÖß±~ ©¹rÓê‚j¶d¸{^Q'˜±Crß ÚH—#¥¥QlÀ×ëã‡DÜ«èî þ&Çæžî;ŽÏºò6ÒLÃXy&ZŒ'j‚¢Ù€IßÚù+–MGi‰*jE€‘JcÜ ÓÌ EÏÚj]o˜ Þr <¾U ûŪæÍ/šÝH¥˜b”¼ ÁñßX GP›ï2›4WŠÏà×£…íÓk†¦H·ÅíMh–*nó÷à]ÁjCº€b7<ب‹¨5車bp2:Á[UªM„QŒçiNMa#<5›áËó¸HýÊ"…×Éw¹¦ì2º–x<›»a±¸3Weü®FÝ⑱ö–î–³|LPÈ~çð~Çå‡|º kD¢µÏàÆAI %1À% ¹Ò – ”ϝS¦‰4&¶£°à Öý”û_Ò Áw°A«Å€?mÇÛgHÉ/8)á¾ÛìáöŽP í¨PŸNÙµº¦‡§Ùš"ÿ«>+ªÕ`Ê÷‡‚ß Õû˜þãÇ-PÍ.¾XV‘€ dÜ"þ4¹ ±Oú‘©t¥¦FªÄÃÄ•b‚znýu½—#cDs˜ÃiÑOˆñ×QO=*IAÊ,¶ŽZƒ;‡wøXè%EÐk:F±Ú” .Ѽ+Áu&Ç`."pÈÉw o&¿dE6‘’EqTuK@Ì¥ã™À(Êk(h‰,H}RÀIXÛš3µ1©_OqÚÒJAñ$ÊÙÜ;D3çŒ[þùœh¬Ã³™ö6ç†NY".Ú‰ï[ªŸŒ '²Ð öø_¨ÂÉ9u鶳ÒŠõTàîMØ#û¯gN‡bÙ놚X„ö …ÉeüÌ^J ‹€.œ$Æ)βÄeæW#óüßĺŸ€ ÀzwV 9oä»f4V*uB «Ë†¹ì¯žR霓æHXa=&“I4K;¯ç‹h×·"UŠ~<•â•ªVêª&ÍSÃÆÅ?ÔqÎ*mTM ˜›µwêd#[C¡©§‘D<©àb†–ÁœøvH/,í:¯( ²£|4-„Æövv„Yͼ™^Á$ˆ„¢Û[6yB.åH*V¨æ?$=˜Ñ€•î¦ñ·­(VlŸ‘ nÀt8W÷´Bûba?q9ú¶Xƒl«ÿ\ù¶’þòUÐj/õ¢Ìµ³g$ƒÎR!¸»|Oߍë’BhîÚÑ¢ñåŒJ„®„£2Ð3•ô02Nt…!£Í]Ïc½Qÿ?ˆ<&ÃA¾Ú,JˆijÌ#5yz„‰Î|ÊŽ5QÏ:‹ÐaóVÔxW—CpeÏzÐïíçôÿÅ_[hãsÐ_/ŽTÝ?BîˆííV$<¿i>²F¬_Eß¿ †bÊŒº­ÿ®Z H“C}”¬,Mp ý/Bá£w>˜YV°aƒúh+cŠ- r/[%|üUMHäQ°X»|û/@|°¥Ð !BÔ Ç¢Ä©š+Õì D«7ìN¶ŽðÔ " ƶ’ÖçtA‰Û×}{tþz­¾GÍ›k¹OEJR$ Â׃ «ëÁ"oÉôž$oUK(Ä)Ãz³Ê-‹êN[Ò3Œñbï8P 4ƒ×q¢bo|?<ÛX¬òÄÍ°L–±›(™ûG?ýË©ÚÄ–ÂDØÐ_Ç¡ô ¾–ÄÏø ×e8Ë©$ÄF¹Å‹ì[©óìl:F¾f´‹‹Xì²ï®\¬ôùƒ ÿat¥óèÒùHß0äe‚;ü×h:ÆWðHž=Ã8骣"kœ'Y?³}Tûè€>?0l›e1Lòñ„aæKÆw…hÖŠùW…ÈÆÄ0ši·›[pcwËþñiêíY/~-Á5˜!¿†A›™Mÿþ(±“t@â“ö2­´TG5yé]çå僳 .·ÍïçÝ7UÚ±Ð/Nè»,_Ï ùdj7\ï Wì4›„»c¸àešg#ÒÊ⥭áØo5‘?ÌdÝô¯ ¹kzsƒ=´#ëÉK›Ø´±-¥eW?‡çßtòTã…$Ý+qÿ±ƒ÷_3Ô¥í÷:æ–ž<·Ö‡‰Å¢ š‡%Ô—utÌÈìðžgÖÀz²À—ï÷Óîäõ{K'´È÷³yaÏÁjƒô}ž§®æÊydÕÈë5¯èˆõvÕ©ã*çD„ “z„Ó‡^^xÂ3M§A´JG‚öï 3W'ˆ.OvXè¡ÊÕª?5º7†˜(˜Ç¶#çê’¶!ÌdZK§æ 0fãaN]òY³RV ™î$®K2R¨`W!1Ôó\;Ý ýB%qæK•&ÓÈe9È0êI±žeŸß -ú@žQr¦ ö4»M¼Áè¹µmw 9 EÆE_°2ó„ŸXKWÁ×Hóì^´²GѝF©óäR†¦‰ç"V»eØ<3ùd3ÿÚ¤Žú“Gi" —‘_ÙËÎ~Üö¯¥½Î»üŸEÚŽåmÞþí ;ÞólËΦMzA"Âf(´òá;Éï(/7½ûñÌ­cïÕçлþÝz¾-ÍvÑ“pH­–ðÓj$¸Äû¤‚‘ãUBË-n“2åPkS5&‹Â|+g^œ®Ì͆d!OïäîU«c;{Û!ÅŽ«ëZ9Ókóˆ]¯ƒ›né `ÇÒ+tÆš (ØKá¾—=3œ®•vuMñg²\ï Ec€ 05±d™‡×iÇ×›UúvÌ¢£Èþ¡ÕØô¶ßÎA"ß±#Ö²ˆÊŸ¦*Ä~ij|àø.-¼'»Ú¥£h ofº¦‡VsR=N½„Î v˜Z*SÌ{=jÑB‹tê…;’HžH¯8–îDù8ñ¢|Q•bÛçš–‹m³“ê¨ åÏ^m¬Žãþ©ïêO‡½6] µÆ„Ooòü ²x}N¦Ë3ïé¿»€›HA˜m%çÞ/¿í7Fø“‹léUk)É°Œµ8Q8›:ÀŠeT*šõ~ôڝG6 ¢}`ùH­–”¡k ‰P1>š†®9z11!X wKfmÁ¦xÑ,N1Q”–æB¶M…ÒÃv6SMˆhU¬ÊPŽï‘öj=·CŒ¯u¹ƒVIЃsx4’ömÛýc塶7ßŠß 57^\wÒÐÆ k§h,Œý î«q^R½3]J¸ÇðN ‚çU¬ôº^Áì} ³f©Õœ§ˆã:FÄÈ‚é(€™?àýÓüè1Gô£¼éj‚OÅñ  #>×—ßtà 0G¥Åa뀐kßhc™À_ÉñÞ#±)GD" YîäË-ÿÙ̪ ¹™a¯´¢E\ÝÒö‚;™„ë]_ p8‰o¡ñ+^÷ 3‘'dT4œŽ ðVë½° :¬víÑ«£tßÚS-3¶“þ2 †üüʨòrš¹M{É_¤`Û¨0ìjœøJ‡:÷ÃáZ˜†@GP&œÑDGÏs¡þ¦þDGú‘1Yá9Ôþ¼ ûø…§÷8&–ÜÑnÄ_m®^üÆ`;ÉVÁJ£?â€-ßê}suÍ2sõA NÌúA磸‘îÿÚ»ƒìö·á¿±tÑÐ"Tÿü˜[@/äj¬€uüªìù¥Ý˜á8Ý´sõj 8@rˆð äþZÇD®ÿUÏ2ùôõrBzÆÏÞž>Ì™xœ“ wiÎ×7_… ¸ \#€MɁV¶¥üÕÿPÔ9Z‡ø§É8#H:ƒ5ÀÝå9ÍIŒ5åKÙŠ÷qÄ>1AÈøžj"µÂд/ªnÀ qªã}"iŸBå˜ÓÛŽ¦…&ݧ;G@—³b¯“•"´4í¨ôM¨åñC‹ïùÉó¯ÓsSH2Ý@ßáM‡ˆKÀªÛUeø/4\gnm¥‹ŸŒ qÄ b9ÞwÒNÏ_4Ég³ú=܆‚´ •â¥õeíþkjz>éÚyU«Íӝ݃6"8/ø{=Ô¢»G¥ äUw°W«,ô—¿ãㆅү¢³xŠUû™yŒ (øSópÐ 9\åTâ»—*oG$/×ÍT†Y¿1¤Þ¢_‡ ¼ „±ÍçèSaÓ 3ÛMÁBkxs‰’R/¡¤ˆÙçª(*õ„üXÌ´ƒ E§´¬EF"Ù”R/ÐNyÆÂ^°?™6¡œïJ·±$§?º>ÖüœcNÌù¯G ‹ñ2ŠBB„^·úìaz¨k:#¨Æ¨8LÎõލ£^§S&cŒÐU€ü(‡F±Š¼&P>8ÙÁ ‰ p5?0ÊƃZl¸aô š¼¡}gÿ¶zÆC²¹¬ÎÖG*HB¡O<º2#ñŒAƒ–¡B˜´É$¥›É:FÀÔx¾u?XÜÏÓvN©RS{2ʈãk9rmP¼Qq̳ è¼ÐFׄ^¡Öì fE“F4A…!ì/…¦Lƒ… … $%´¾yã@CI¬ á—3PþBÏNÿ<ý°4Ü ËÃ#ØÍ~âW«rEñw‹eùMMHß²`¬Öó½íf³:‹k˜¯÷}Z!ã¿<¥,\#öµÀ¯aÒNÆIé,Ћ–lŽ#Àæ9ÀÒS·I’½-Ïp Äz¤Š Â* ­íÄ9­< h>׍3ZkËU¹§˜ŒŠ±f­’¤º³Q ÏB?‹#µíÃ¥®@(Gs«†vI¥Mµ‹Á©e~2ú³ÁP4ìÕi‚²Ê^ö@-DþÓàlÜOÍ]n"µã:žpsŽ¢:! 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Current File : /sbin/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 [ -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 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

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