ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / sbin

#!/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

[+] ..
[-] poweroff [edit]
[-] sulogin [edit]
[-] ppp-watch [edit]
[-] addpart [edit]
[-] kpartx [edit]
[-] tcsd [edit]
[-] rsyslogd [edit]
[-] xfs_freeze [edit]
[-] selinuxconlist [edit]
[-] sendmail_bitninja [edit]
[-] nl-qdisc-add [edit]
[-] dnssec-coverage [edit]
[-] btrfs [edit]
[-] genrandom [edit]
[-] lsmod [edit]
[-] readprofile [edit]
[-] suexec [edit]
[-] blkdeactivate [edit]
[-] usermod [edit]
[-] nl-link-list [edit]
[-] mkdict [edit]
[-] xtables-multi [edit]
[-] rndc [edit]
[-] fsck.btrfs [edit]
[-] init [edit]
[-] service [edit]
[-] saslauthd [edit]
[-] tcpdump [edit]
[-] dovecot [edit]
[-] rndc-confgen [edit]
[-] fsck.ext2 [edit]
[-] nfsstat [edit]
[-] routef [edit]
[-] xfs_rtcp [edit]
[-] rtmon [edit]
[-] ddns-confgen [edit]
[-] dovecot_cpshutdown [edit]
[-] vigr [edit]
[-] e4defrag [edit]
[-] pure-authd [edit]
[-] showmount [edit]
[-] eapol_test [edit]
[-] biosdecode [edit]
[-] yumdb [edit]
[-] depmod [edit]
[-] ctstat [edit]
[-] dracut [edit]
[-] xfs_copy [edit]
[-] genl-ctrl-list [edit]
[-] pwconv [edit]
[-] selabel_partial_match [edit]
[-] iotop [edit]
[-] arp-scan [edit]
[-] iptables [edit]
[-] gssproxy [edit]
[-] exim_lock [edit]
[-] tsig-keygen [edit]
[-] pure-config.pl [edit]
[-] firewalld [edit]
[-] debugfs [edit]
[-] ifenslave [edit]
[-] e2freefrag [edit]
[-] auditd [edit]
[-] mkfs.ext3 [edit]
[-] tracepath [edit]
[-] findfs [edit]
[-] quotaon [edit]
[-] rpc.mountd [edit]
[-] fcgistarter [edit]
[-] capsh [edit]
[-] atopacctd [edit]
[-] update-smart-drivedb [edit]
[-] selabel_digest [edit]
[-] lusermod [edit]
[-] bitninjacli-interactive [edit]
[-] setquota [edit]
[-] nl-cls-list [edit]
[-] tune2fs [edit]
[-] edquota [edit]
[-] pure-certd [edit]
[-] dnssec-revoke [edit]
[-] xfs_fsr [edit]
[-] exigrep [edit]
[-] mke2fs [edit]
[-] new-kernel-pkg [edit]
[-] rpc.statd [edit]
[-] ebtables-restore [edit]
[-] nsec3hash [edit]
[-] shutdown [edit]
[-] mii-tool [edit]
[-] audispd-zos-remote [edit]
[-] atrun [edit]
[-] sestatus [edit]
[-] sushell [edit]
[-] btrfs-zero-log [edit]
[-] nstat [edit]
[-] grub2-setpassword [edit]
[-] newusers [edit]
[-] setsebool [edit]
[-] grub2-rpm-sort [edit]
[-] dnssec-settime [edit]
[-] iptunnel [edit]
[-] luseradd [edit]
[-] rtcwake [edit]
[-] btrfs-map-logical [edit]
[-] rdma [edit]
[-] mkfs.ext2 [edit]
[-] webmitm [edit]
[-] iptables-restore [edit]
[-] ldattach [edit]
[-] route [edit]
[-] rpc.nfsd [edit]
[-] iprinit [edit]
[-] quotaoff [edit]
[-] ctrlaltdel [edit]
[-] create-cracklib-dict [edit]
[-] hwclock [edit]
[-] augenrules [edit]
[-] named-checkconf [edit]
[-] smartctl [edit]
[-] iprupdate [edit]
[-] installkernel [edit]
[-] fsck.ext4 [edit]
[-] load_policy [edit]
[-] convertquota [edit]
[-] auditctl [edit]
[-] luserdel [edit]
[-] plipconfig [edit]
[-] agetty [edit]
[-] sshd [edit]
[-] unix_update [edit]
[-] sys-unconfig [edit]
[-] bitninja-config [edit]
[-] ping6 [edit]
[-] ifup [edit]
[-] virt-what [edit]
[-] dmstats [edit]
[-] quotastats [edit]
[-] pluginviewer [edit]
[-] modsec-sdbm-util [edit]
[-] cracklib-unpacker [edit]
[-] kexec [edit]
[-] crond [edit]
[-] dnssec-keymgr [edit]
[-] pure-ftpwho [edit]
[-] selinux_restorecon [edit]
[-] grpck [edit]
[-] partx [edit]
[-] fdformat [edit]
[-] eximstats [edit]
[-] plymouthd [edit]
[-] slattach [edit]
[-] genl [edit]
[-] tcpslice [edit]
[-] arpspoof [edit]
[-] glibc_post_upgrade.x86_64 [edit]
[-] lgroupdel [edit]
[-] iconvconfig.x86_64 [edit]
[-] sm-notify [edit]
[-] dmsetup [edit]
[-] msgsnarf [edit]
[-] blkmapd [edit]
[-] ip [edit]
[-] getenforce [edit]
[-] nologin [edit]
[-] hardlink [edit]
[-] pwck [edit]
[-] authconfig-tui [edit]
[-] btrfsck [edit]
[-] safe_finger [edit]
[-] grpconv [edit]
[-] sln [edit]
[-] wipefs [edit]
[-] blockdev [edit]
[-] testsaslauthd [edit]
[-] sasldblistusers2 [edit]
[-] dsniff [edit]
[-] dnssec-checkds [edit]
[-] key.dns_resolver [edit]
[-] htcacheclean [edit]
[-] osd_login [edit]
[-] lid [edit]
[-] nl-class-delete [edit]
[-] mkfs.ext4 [edit]
[-] alternatives [edit]
[-] tcpd [edit]
[-] httpd [edit]
[-] tcpnice [edit]
[-] mount.nfs4 [edit]
[-] mkfs.xfs [edit]
[-] e2undo [edit]
[-] sshow [edit]
[-] selabel_lookup [edit]
[-] chkconfig [edit]
[-] selinuxenabled [edit]
[-] xfs_repair [edit]
[-] chcpu [edit]
[-] grub2-reboot [edit]
[-] nl-class-add [edit]
[-] mailsnarf [edit]
[-] ebtables [edit]
[-] tuned-adm [edit]
[-] runq [edit]
[-] autrace [edit]
[-] getsebool [edit]
[-] cfdisk [edit]
[-] rtacct [edit]
[-] dhclient [edit]
[-] sim_server [edit]
[-] wpa_passphrase [edit]
[-] rpcdebug [edit]
[-] exim [edit]
[-] cracklib-check [edit]
[-] lshw [edit]
[-] sshd-keygen [edit]
[-] netreport [edit]
[-] rpcinfo [edit]
[-] xfs_io [edit]
[-] ifcfg [edit]
[-] grpunconv [edit]
[-] xfs_ncheck [edit]
[-] quot [edit]
[-] fsck.minix [edit]
[-] try-from [edit]
[-] ifstat [edit]
[-] plymouth-set-default-theme [edit]
[-] t1libconfig [edit]
[-] modprobe [edit]
[-] mkfs [edit]
[-] semanage [edit]
[-] fixfiles [edit]
[-] iprdump [edit]
[-] lfd [edit]
[-] pure-ftpd [edit]
[-] lgroupmod [edit]
[-] unix_chkpwd [edit]
[-] btrfs-image [edit]
[-] addgnupghome [edit]
[-] dumpe2fs [edit]
[-] partprobe [edit]
[-] grub2-macbless [edit]
[-] mkfs.btrfs [edit]
[-] groupdel [edit]
[-] mklost+found [edit]
[-] snmpd [edit]
[-] ifconfig [edit]
[-] request-key [edit]
[-] lsof [edit]
[-] suphp [edit]
[-] switch_root [edit]
[-] grub2-get-kernel-settings [edit]
[-] iptables-save [edit]
[-] zramctl [edit]
[-] named-compilezone [edit]
[-] sendmail [edit]
[-] grub2-ofpathname [edit]
[-] parted [edit]
[-] sysctl [edit]
[-] fstrim [edit]
[-] ip6tables [edit]
[-] dmfilemapd [edit]
[-] fsck.ext3 [edit]
[-] ether-wake [edit]
[-] authconfig [edit]
[-] urlsnarf [edit]
[-] blkid [edit]
[-] sefcontext_compile [edit]
[-] swapon [edit]
[-] resizepart [edit]
[-] dnssec-importkey [edit]
[-] exinext [edit]
[-] zic [edit]
[-] e2fsck [edit]
[-] xfs_admin [edit]
[-] vpddecode [edit]
[-] imunify-notifier [edit]
[-] mysqld [edit]
[-] chgpasswd [edit]
[-] halt [edit]
[-] iprconfig [edit]
[-] vipw [edit]
[-] sshmitm [edit]
[-] exim_checkaccess [edit]
[-] losetup [edit]
[-] xfs_info [edit]
[-] arping [edit]
[-] cracklib-format [edit]
[-] exicyclog [edit]
[-] whmapi1 [edit]
[-] bitninjacli [edit]
[-] rtpr [edit]
[-] modinfo [edit]
[-] iprsos [edit]
[-] accessdb [edit]
[-] start-statd [edit]
[-] nl-pktloc-lookup [edit]
[-] xfs_estimate [edit]
[-] tcpdmatch [edit]
[-] swapoff [edit]
[-] grub2-bios-setup [edit]
[-] rmmod [edit]
[-] genhostid [edit]
[-] lnstat [edit]
[-] ipmaddr [edit]
[-] grub2-set-default [edit]
[-] mii-diag [edit]
[-] webspy [edit]
[-] btrfs-select-super [edit]
[-] ausearch [edit]
[-] bridge [edit]
[-] nl-qdisc-delete [edit]
[-] xfs_logprint [edit]
[-] wpa_cli [edit]
[-] genhomedircon [edit]
[-] dnssec-keyfromlabel [edit]
[-] mountstats [edit]
[-] nl-cls-add [edit]
[-] mtr [edit]
[-] selabel_lookup_best_match [edit]
[-] arp-fingerprint [edit]
[-] btrfs-convert [edit]
[-] uuserver [edit]
[-] cbq [edit]
[-] getcap [edit]
[-] pam_tally2 [edit]
[-] sw-engine-fpm [edit]
[-] pam_timestamp_check [edit]
[-] restorecon [edit]
[-] mkfs.cramfs [edit]
[-] runlevel [edit]
[-] logrotate [edit]
[-] exim_fixdb [edit]
[-] audispd [edit]
[-] avcstat [edit]
[-] fuser [edit]
[-] nfsidmap [edit]
[-] pure-quotacheck [edit]
[-] ip6tables-save [edit]
[-] usernetctl [edit]
[-] exim_tidydb [edit]
[-] mount.nfs [edit]
[-] audisp-remote [edit]
[-] getpcaps [edit]
[-] cacertdir_rehash [edit]
[-] named [edit]
[-] exim_dbmbuild [edit]
[-] anacron [edit]
[-] xfs_db [edit]
[-] grub2-install [edit]
[-] start-stop-daemon [edit]
[-] pidof [edit]
[-] paperconfig [edit]
[-] irqbalance [edit]
[-] dnssec-dsfromkey [edit]
[-] check_forensic [edit]
[-] fxload [edit]
[-] pwhistory_helper [edit]
[-] blkdiscard [edit]
[-] lwresd [edit]
[-] tc [edit]
[-] setcap [edit]
[-] reboot [edit]
[-] xfs_mkfile [edit]
[-] btrfstune [edit]
[-] logsave [edit]
[-] insmod [edit]
[-] mkhomedir_helper [edit]
[-] fsfreeze [edit]
[-] badblocks [edit]
[-] tmpwatch [edit]
[-] groupadd [edit]
[-] rotatelogs [edit]
[-] mkdumprd [edit]
[-] makedumpfile [edit]
[-] matchpathcon [edit]
[-] ipset [edit]
[-] runuser [edit]
[-] telinit [edit]
[-] build-locale-archive [edit]
[-] rdisc [edit]
[-] packer [edit]
[-] biosdevname [edit]
[-] csf [edit]
[-] nameif [edit]
[-] xfs_metadump [edit]
[-] fsck [edit]
[-] whmapi0 [edit]
[-] routel [edit]
[-] rpc.rquotad [edit]
[-] umount.nfs [edit]
[-] exiqsumm [edit]
[-] sasl2-shared-mechlist [edit]
[-] NetworkManager [edit]
[-] udevadm [edit]
[-] tcpkill [edit]
[-] mkswap [edit]
[-] fsck.cramfs [edit]
[-] macof [edit]
[-] pam_console_apply [edit]
[-] clockdiff [edit]
[-] clock [edit]
[-] mysqld-debug [edit]
[-] ip6tables-restore [edit]
[-] nfsdcltrack [edit]
[-] filesnarf [edit]
[-] umount.nfs4 [edit]
[-] fdisk [edit]
[-] xfs_bmap [edit]
[-] useradd [edit]
[-] nl-qdisc-list [edit]
[-] devlink [edit]
[-] xfs_growfs [edit]
[-] ebtables-save [edit]
[-] quotacheck [edit]
[-] yum-complete-transaction [edit]
[-] pdns_server [edit]
[-] visudo [edit]
[-] lgroupadd [edit]
[-] aureport [edit]
[-] chpasswd [edit]
[-] filefrag [edit]
[-] ifdown [edit]
[-] grub2-sparc64-setup [edit]
[-] btrfs-debug-tree [edit]
[-] dhclient-script [edit]
[-] nl-class-list [edit]
[-] nfsiostat [edit]
[-] pure-mrtginfo [edit]
[-] faillock [edit]
[-] nl-classid-lookup [edit]
[-] adduser [edit]
[-] named-checkzone [edit]
[-] resize2fs [edit]
[-] get-oui [edit]
[-] get-iab [edit]
[-] exim_dumpdb [edit]
[-] nscd [edit]
[-] ldconfig [edit]
[-] setenforce [edit]
[-] pivot_root [edit]
[-] iconvconfig [edit]
[-] lchage [edit]
[-] exiqgrep [edit]
[-] groupmod [edit]
[-] snmptrapd [edit]
[-] dnssec-signzone [edit]
[-] smartd [edit]
[-] dnsspoof [edit]
[-] gss-server [edit]
[-] rpcbind [edit]
[-] xqmstats [edit]
[-] selinuxdefcon [edit]
[-] e2image [edit]
[-] selinuxexeccon [edit]
[-] rpc.gssd [edit]
[-] semodule [edit]
[-] xfs_mdrestore [edit]
[-] sfdisk [edit]
[-] cracklib-packer [edit]
[-] lnewusers [edit]
[-] exiwhat [edit]
[-] grub2-mkconfig [edit]
[-] tuned [edit]
[-] ownership [edit]
[-] lpasswd [edit]
[-] install-info [edit]
[-] e2label [edit]
[-] dnssec-verify [edit]
[-] apachectl [edit]
[-] rtstat [edit]
[-] ethtool [edit]
[-] tracepath6 [edit]
[-] atd [edit]
[-] iprdbg [edit]
[-] userdel [edit]
[-] applygnupgdefaults [edit]
[-] whmlogin [edit]
[-] arp [edit]
[-] swaplabel [edit]
[-] isc-hmac-fixup [edit]
[-] weak-modules [edit]
[-] mkfs.minix [edit]
[-] exportfs [edit]
[-] dnssec-keygen [edit]
[-] xfs_quota [edit]
[-] rpc.idmapd [edit]
[-] nl-cls-delete [edit]
[-] zdump [edit]
[-] grubby [edit]
[-] saslpasswd2 [edit]
[-] fsck.xfs [edit]
[-] named-journalprint [edit]
[-] delpart [edit]
[-] vmcore-dmesg [edit]
[-] consoletype [edit]
[-] groupmems [edit]
[-] killall5 [edit]
[-] update-alternatives [edit]
[-] grub2-probe [edit]
[-] setfiles [edit]
[-] pure-uploadscript [edit]
[-] arpd [edit]
[-] repquota [edit]
[-] btrfs-find-root [edit]
[-] dmidecode [edit]
[-] pwunconv [edit]
[-] chroot [edit]
[-] wpa_supplicant [edit]
[-] ss [edit]