791 lines
26 KiB
Bash
791 lines
26 KiB
Bash
#!/bin/bash
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#
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# dhclient-script: Network interface configuration script run by
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# dhclient based on DHCP client communication
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#
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# Copyright (C) 2008, 2009, 2010 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): David Cantrell <dcantrell@redhat.com>
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#
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# ----------
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# This script is a rewrite/reworking on dhclient-script originally
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# included as part of dhcp-970306:
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# dhclient-script for Linux. Dan Halbert, March, 1997.
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# Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
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# Modified by David Cantrell <dcantrell@redhat.com> for Fedora and RHEL
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# ----------
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#
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PATH=/bin:/usr/bin:/sbin
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# scripts in dhclient.d/ use $SAVEDIR (#833054)
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SAVEDIR=/var/lib/dhclient
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LOGFACILITY="local7"
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LOGLEVEL="notice"
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ETCDIR="/etc/dhcp"
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logmessage() {
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msg="${1}"
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logger -p ${LOGFACILITY}.${LOGLEVEL} -t "NET" "dhclient: ${msg}"
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}
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if [ -x /sbin/restorecon ]; then
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fix_context() {
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/sbin/restorecon ${1} >/dev/null 2>&1
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}
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else
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fix_context() { :; }
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fi
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eventually_add_hostnames_domain_to_search() {
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# For the case when hostname for this machine has a domain that is not in domain_search list
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# 1) get a hostname with `ipcalc --hostname` or `hostname`
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# 2) get the domain from this hostname
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# 3) add this domain to search line in resolv.conf if it's not already
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# there (domain list that we have recently added there is a parameter of this function)
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# We can't do this directly when generating resolv.conf in make_resolv_conf(), because
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# we need to first save the resolv.conf with obtained values before we can call `ipcalc --hostname`.
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# See bug 637763
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search="${1}"
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if need_hostname; then
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status=1
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if [ -n "${new_ip_address}" ]; then
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eval $(/bin/ipcalc --silent --hostname ${new_ip_address} ; echo "status=$?")
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elif [ -n "${new_ip6_address}" ]; then
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eval $(/bin/ipcalc --silent --hostname ${new_ip6_address} ; echo "status=$?")
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fi
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if [ ${status} -eq 0 ]; then
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domain=$(echo $HOSTNAME | cut -s -d "." -f 2-)
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fi
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else
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domain=$(hostname 2>/dev/null | cut -s -d "." -f 2-)
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fi
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if [ -n "${domain}" ] &&
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[ ! "${domain}" = "localdomain" ] &&
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[ ! "${domain}" = "localdomain6" ] &&
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[ ! "${domain}" = "(none)" ] &&
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[[ ! "${domain}" = *\ * ]]; then
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is_in="false"
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for s in ${search}; do
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if [ "${s}" = "${domain}" ] ||
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[ "${s}" = "${domain}." ]; then
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is_in="true"
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fi
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done
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if [ "${is_in}" = "false" ]; then
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# Add domain name to search list (#637763)
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sed -i -e "s/${search}/${search} ${domain}/" /etc/resolv.conf
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fi
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fi
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}
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make_resolv_conf() {
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[ "${PEERDNS}" = "no" ] && return
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if [ "${reason}" = "RENEW" ] &&
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[ "${new_domain_name}" = "${old_domain_name}" ] &&
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[ "${new_domain_name_servers}" = "${old_domain_name_servers}" ]; then
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return
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fi
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if [ -n "${new_domain_name}" ] ||
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[ -n "${new_domain_name_servers}" ] ||
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[ -n "${new_domain_search}" ]; then
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rscf="$(mktemp ${TMPDIR:-/tmp}/XXXXXX)"
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echo "; generated by /usr/sbin/dhclient-script" > ${rscf}
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if [ -n "${SEARCH}" ]; then
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search="${SEARCH}"
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else
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if [ -n "${new_domain_search}" ]; then
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# Remove instaces of \032 (#450042)
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search="${new_domain_search//\\032/ }"
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elif [ -n "${new_domain_name}" ]; then
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# Note that the DHCP 'Domain Name Option' is really just a domain
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# name, and that this practice of using the domain name option as
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# a search path is both nonstandard and deprecated.
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search="${new_domain_name}"
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fi
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fi
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if [ -n "${search}" ]; then
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echo "search ${search}" >> $rscf
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fi
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if [ -n "${RES_OPTIONS}" ]; then
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echo "options ${RES_OPTIONS}" >> ${rscf}
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fi
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for nameserver in ${new_domain_name_servers} ; do
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echo "nameserver ${nameserver}" >> ${rscf}
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done
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change_resolv_conf ${rscf}
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rm -f ${rscf}
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if [ -n "${search}" ]; then
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eventually_add_hostnames_domain_to_search "${search}"
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fi
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fix_context /etc/resolv.conf
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elif [ -n "${new_dhcp6_name_servers}" ] ||
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[ -n "${new_dhcp6_domain_search}" ]; then
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rscf="$(mktemp ${TMPDIR:-/tmp}/XXXXXX)"
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echo "; generated by /usr/sbin/dhclient-script" > ${rscf}
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if [ -n "${SEARCH}" ]; then
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search="${SEARCH}"
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else
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if [ -n "${new_dhcp6_domain_search}" ]; then
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search="${new_dhcp6_domain_search//\\032/ }"
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fi
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fi
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if [ -n "${search}" ]; then
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echo "search ${search}" >> $rscf
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fi
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if [ -n "${RES_OPTIONS}" ]; then
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echo "options ${RES_OPTIONS}" >> ${rscf}
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fi
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shopt -s nocasematch
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for nameserver in ${new_dhcp6_name_servers} ; do
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# If the nameserver has a link-local address
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# add a <zone_id> (interface name) to it.
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if [[ "$nameserver" =~ ^fe80:: ]]
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then
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zone_id="%${interface}"
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else
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zone_id=
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fi
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echo "nameserver ${nameserver}$zone_id" >> ${rscf}
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done
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shopt -u nocasematch
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change_resolv_conf ${rscf}
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rm -f ${rscf}
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if [ -n "${search}" ]; then
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eventually_add_hostnames_domain_to_search "${search}"
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fi
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fix_context /etc/resolv.conf
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fi
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}
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exit_with_hooks() {
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exit_status="${1}"
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if [ -x ${ETCDIR}/dhclient-exit-hooks ]; then
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. ${ETCDIR}/dhclient-exit-hooks
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fi
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exit ${exit_status}
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}
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quad2num() {
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if [ $# -eq 4 ]; then
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let n="${1} << 24 | ${2} << 16 | ${3} << 8 | ${4}"
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echo "${n}"
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return 0
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else
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echo "0"
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return 1
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fi
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}
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ip2num() {
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IFS="." quad2num ${1}
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}
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num2ip() {
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let n="${1}"
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let o1="(n >> 24) & 0xff"
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let o2="(n >> 16) & 0xff"
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let o3="(n >> 8) & 0xff"
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let o4="n & 0xff"
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echo "${o1}.${o2}.${o3}.${o4}"
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}
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get_network_address() {
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# get network address for the given IP address and (netmask or prefix)
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ip="${1}"
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nm="${2}"
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if [ -n "${ip}" -a -n "${nm}" ]; then
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if [[ "${nm}" = *.* ]]; then
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ipcalc -s -n ${ip} ${nm} | cut -d '=' -f 2
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else
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ipcalc -s -n ${ip}/${nm} | cut -d '=' -f 2
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fi
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fi
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}
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get_prefix() {
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# get prefix for the given IP address and mask
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ip="${1}"
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nm="${2}"
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if [ -n "${ip}" -a -n "${nm}" ]; then
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ipcalc -s -p ${ip} ${nm} | cut -d '=' -f 2
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fi
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}
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class_bits() {
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let ip=$(IFS='.' ip2num $1)
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let bits=32
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let mask='255'
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for ((i=0; i <= 3; i++, 'mask<<=8')); do
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let v='ip&mask'
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if [ "$v" -eq 0 ] ; then
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let bits-=8
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else
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break
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fi
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done
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echo $bits
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}
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is_router_reachable() {
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# handle DHCP servers that give us a router not on our subnet
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router="${1}"
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routersubnet="$(get_network_address ${router} ${new_subnet_mask})"
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mysubnet="$(get_network_address ${new_ip_address} ${new_subnet_mask})"
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if [ ! "${routersubnet}" = "${mysubnet}" ]; then
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ip -4 route add ${router}/32 dev ${interface}
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if [ $? -eq 0 ]; then
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if ping -q -c1 -w2 -I ${interface} ${router}; then
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return 0
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else
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logmessage "DHCP router ${router} is unreachable on DHCP subnet ${mysubnet} router subnet ${routersubnet}"
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ip route del ${router}/32 dev ${interface}
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return 1
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fi
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else
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logmessage "failed to create host router for unreachable router ${router} not on subnet ${mysubnet}"
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return 1
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fi
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fi
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return 0
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}
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add_default_gateway() {
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router="${1}"
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if is_router_reachable ${router} ; then
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metric=""
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if [ $# -gt 1 ] && [ ${2} -gt 0 ]; then
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metric="metric ${2}"
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fi
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ip -4 route replace default via ${router} dev ${interface} ${metric}
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if [ $? -ne 0 ]; then
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logmessage "failed to create default route: ${router} dev ${interface} ${metric}"
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return 1
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else
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return 0
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fi
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fi
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return 1
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}
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execute_client_side_configuration_scripts() {
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# execute any additional client side configuration scripts we have
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if [ "${1}" == "config" ] || [ "${1}" == "restore" ]; then
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for f in ${ETCDIR}/dhclient.d/*.sh ; do
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if [ -x ${f} ]; then
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subsystem="${f%.sh}"
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subsystem="${subsystem##*/}"
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. ${f}
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"${subsystem}_${1}"
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fi
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done
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fi
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}
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flush_dev() {
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# Instead of bringing the interface down (#574568)
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# explicitly clear the ARP cache and flush all addresses & routes.
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ip -4 addr flush dev ${1} >/dev/null 2>&1
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ip -4 route flush dev ${1} >/dev/null 2>&1
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ip -4 neigh flush dev ${1} >/dev/null 2>&1
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}
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dhconfig() {
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if [ -n "${old_ip_address}" ] && [ -n "${alias_ip_address}" ] &&
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[ ! "${alias_ip_address}" = "${old_ip_address}" ]; then
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# possible new alias, remove old alias first
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ip -4 addr del ${old_ip_address} dev ${interface} label ${interface}:0
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fi
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if [ -n "${old_ip_address}" ] &&
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[ ! "${old_ip_address}" = "${new_ip_address}" ]; then
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# IP address changed. Delete all routes, and clear the ARP cache.
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flush_dev ${interface}
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fi
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if [ "${reason}" = "BOUND" ] || [ "${reason}" = "REBOOT" ] ||
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[ ! "${old_ip_address}" = "${new_ip_address}" ] ||
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[ ! "${old_subnet_mask}" = "${new_subnet_mask}" ] ||
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[ ! "${old_network_number}" = "${new_network_number}" ] ||
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[ ! "${old_broadcast_address}" = "${new_broadcast_address}" ] ||
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[ ! "${old_routers}" = "${new_routers}" ] ||
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[ ! "${old_interface_mtu}" = "${new_interface_mtu}" ]; then
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ip -4 addr add ${new_ip_address}/${new_prefix} broadcast ${new_broadcast_address} dev ${interface} >/dev/null 2>&1
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ip link set dev ${interface} up
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# The 576 MTU is only used for X.25 and dialup connections
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# where the admin wants low latency. Such a low MTU can cause
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# problems with UDP traffic, among other things. As such,
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# disallow MTUs from 576 and below by default, so that broken
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# MTUs are ignored, but higher stuff is allowed (1492, 1500, etc).
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if [ -n "${new_interface_mtu}" ] && [ ${new_interface_mtu} -gt 576 ]; then
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ip link set dev ${interface} mtu ${new_interface_mtu}
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fi
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# static routes
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if [ -n "${new_classless_static_routes}" ] ||
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[ -n "${new_static_routes}" ]; then
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if [ -n "${new_classless_static_routes}" ]; then
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IFS=', |' static_routes=(${new_classless_static_routes})
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else
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IFS=', |' static_routes=(${new_static_routes})
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fi
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route_targets=()
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for((i=0; i<${#static_routes[@]}; i+=2)); do
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target=${static_routes[$i]}
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if [ -n "${new_classless_static_routes}" ]; then
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if [ ${target} = "0" ]; then
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# If the DHCP server returns both a Classless Static Routes option and
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# a Router option, the DHCP client MUST ignore the Router option. (RFC3442)
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new_routers=""
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prefix="0"
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else
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prefix=${target%%.*}
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target=${target#*.}
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IFS="." target_arr=(${target})
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unset IFS
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((pads=4-${#target_arr[@]}))
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for j in $(seq $pads); do
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target="${target}.0"
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done
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# Client MUST zero any bits in the subnet number where the corresponding bit in the mask is zero.
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# In other words, the subnet number installed in the routing table is the logical AND of
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# the subnet number and subnet mask given in the Classless Static Routes option. (RFC3442)
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target="$(get_network_address ${target} ${prefix})"
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fi
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else
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prefix=$(class_bits ${target})
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fi
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gateway=${static_routes[$i+1]}
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# special case 0.0.0.0 to allow static routing for link-local addresses
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# (including IPv4 multicast) which will not have a next-hop (#769463, #787318)
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if [ "${gateway}" = "0.0.0.0" ]; then
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valid_gateway=0
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scope='scope link'
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else
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is_router_reachable ${gateway}
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valid_gateway=$?
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scope=''
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fi
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if [ ${valid_gateway} -eq 0 ]; then
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metric=''
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for t in ${route_targets[@]}; do
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if [ ${t} = ${target} ]; then
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if [ -z "${metric}" ]; then
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metric=1
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else
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((metric=metric+1))
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fi
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fi
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done
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if [ -n "${metric}" ]; then
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metric="metric ${metric}"
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fi
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ip -4 route replace ${target}/${prefix} proto static via ${gateway} dev ${interface} ${metric} ${scope}
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if [ $? -ne 0 ]; then
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logmessage "failed to create static route: ${target}/${prefix} via ${gateway} dev ${interface} ${metric}"
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else
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route_targets=(${route_targets[@]} ${target})
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fi
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fi
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done
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fi
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# gateways
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if [[ ( "${DEFROUTE}" != "no" ) &&
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(( -z "${GATEWAYDEV}" ) || ( "${GATEWAYDEV}" = "${interface}" )) ]]; then
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if [[ ( -z "$GATEWAY" ) ||
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(( -n "$DHCLIENT_IGNORE_GATEWAY" ) && ( "$DHCLIENT_IGNORE_GATEWAY" = [Yy]* )) ]]; then
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metric="${METRIC:-}"
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let i="${METRIC:-0}"
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default_routers=()
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for router in ${new_routers} ; do
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added_router=-
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for r in ${default_routers[@]} ; do
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if [ "${r}" = "${router}" ]; then
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added_router=1
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fi
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done
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if [ -z "${router}" ] ||
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[ "${added_router}" = "1" ] ||
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[ $(IFS=. ip2num ${router}) -le 0 ] ||
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[[ ( "${router}" = "${new_broadcast_address}" ) &&
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( "${new_subnet_mask}" != "255.255.255.255" ) ]]; then
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continue
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fi
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default_routers=(${default_routers[@]} ${router})
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add_default_gateway ${router} ${metric}
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let i=i+1
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metric=${i}
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done
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elif [ -n "${GATEWAY}" ]; then
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routersubnet=$(get_network_address ${GATEWAY} ${new_subnet_mask})
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mysubnet=$(get_network_address ${new_ip_address} ${new_subnet_mask})
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if [ "${routersubnet}" = "${mysubnet}" ]; then
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ip -4 route replace default via ${GATEWAY} dev ${interface}
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fi
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fi
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fi
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fi
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if [ ! "${new_ip_address}" = "${alias_ip_address}" ] &&
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[ -n "${alias_ip_address}" ]; then
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# Reset the alias address (fix: this should really only do this on changes)
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ip -4 addr flush dev ${interface} label ${interface}:0 >/dev/null 2>&1
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ip -4 addr add ${alias_ip_address}/${alias_prefix} broadcast ${alias_broadcast_address} dev ${interface} label ${interface}:0
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ip -4 route replace ${alias_ip_address}/32 dev ${interface}
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fi
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# After dhclient brings an interface UP with a new IP address, subnet mask,
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# and routes, in the REBOOT/BOUND states -> search for "dhclient-up-hooks".
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if [ "${reason}" = "BOUND" ] || [ "${reason}" = "REBOOT" ] ||
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[ ! "${old_ip_address}" = "${new_ip_address}" ] ||
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[ ! "${old_subnet_mask}" = "${new_subnet_mask}" ] ||
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[ ! "${old_network_number}" = "${new_network_number}" ] ||
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[ ! "${old_broadcast_address}" = "${new_broadcast_address}" ] ||
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[ ! "${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
|
|
fix_context /etc/localtime
|
|
fi
|
|
fi
|
|
|
|
execute_client_side_configuration_scripts "config"
|
|
}
|
|
|
|
# Section 18.1.8. (Receipt of Reply Messages) of RFC 3315 says:
|
|
# The client SHOULD perform duplicate address detection on each of
|
|
# the addresses in any IAs it receives in the Reply message before
|
|
# using that address for traffic.
|
|
add_ipv6_addr_with_DAD() {
|
|
ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
|
|
dev ${interface} scope global
|
|
|
|
# repeatedly test whether newly added address passed
|
|
# duplicate address detection (DAD)
|
|
for i in $(seq 5); do
|
|
sleep 1 # give the DAD some time
|
|
|
|
# tentative flag == DAD is still not complete
|
|
tentative=$(ip -6 addr show dev ${interface} tentative \
|
|
| grep ${new_ip6_address}/${new_ip6_prefixlen})
|
|
# dadfailed flag == address is already in use somewhere else
|
|
dadfailed=$(ip -6 addr show dev ${interface} dadfailed \
|
|
| grep ${new_ip6_address}/${new_ip6_prefixlen})
|
|
|
|
if [ -n "${dadfailed}" ] ; then
|
|
#ip -6 addr del ${new_ip6_address}/${new_ip6_prefixlen} dev ${interface}
|
|
exit_with_hooks 3
|
|
fi
|
|
if [ -z "${tentative}" ] ; then
|
|
# DAD is over
|
|
return 0
|
|
fi
|
|
done
|
|
}
|
|
|
|
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 [ -z "${new_ip6_address}" ] ||
|
|
[ -z "${new_ip6_prefixlen}" ]; then
|
|
exit_with_hooks 2
|
|
fi
|
|
|
|
if [ ! "${new_ip6_address}" = "${old_ip6_address}" ]; then
|
|
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 ${interface} scope global permanent
|
|
|
|
exit_with_hooks 0
|
|
;;
|
|
|
|
BOUND|RENEW|REBIND|REBOOT)
|
|
if [ -z "${interface}" ] || [ -z "${new_ip_address}" ]; then
|
|
exit_with_hooks 2
|
|
fi
|
|
if arping -D -q -c2 -I ${interface} ${new_ip_address}; then
|
|
dhconfig
|
|
exit_with_hooks 0
|
|
else
|
|
# DAD failed, i.e. address is already in use
|
|
exit_with_hooks 1
|
|
fi
|
|
;;
|
|
|
|
BOUND6|RENEW6|REBIND6|DEPREF6)
|
|
dh6config
|
|
exit_with_hooks 0
|
|
;;
|
|
|
|
EXPIRE6|RELEASE6|STOP6)
|
|
if [ -z "${old_ip6_address}" ] || [ -z "${old_ip6_prefixlen}" ]; then
|
|
exit_with_hooks 2
|
|
fi
|
|
|
|
ip -6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
|
|
dev ${interface}
|
|
|
|
execute_client_side_configuration_scripts "restore"
|
|
|
|
if [ -x ${ETCDIR}/dhclient-${interface}-down-hooks ]; then
|
|
. ${ETCDIR}/dhclient-${interface}-down-hooks
|
|
elif [ -x ${ETCDIR}/dhclient-down-hooks ]; then
|
|
. ${ETCDIR}/dhclient-down-hooks
|
|
fi
|
|
|
|
exit_with_hooks 0
|
|
;;
|
|
|
|
EXPIRE|FAIL|RELEASE|STOP)
|
|
execute_client_side_configuration_scripts "restore"
|
|
|
|
if [ -x ${ETCDIR}/dhclient-${interface}-down-hooks ]; then
|
|
. ${ETCDIR}/dhclient-${interface}-down-hooks
|
|
elif [ -x ${ETCDIR}/dhclient-down-hooks ]; then
|
|
. ${ETCDIR}/dhclient-down-hooks
|
|
fi
|
|
|
|
if [ -n "${alias_ip_address}" ]; then
|
|
# Flush alias
|
|
ip -4 addr flush dev ${interface} label ${interface}:0 >/dev/null 2>&1
|
|
fi
|
|
|
|
if [ -n "${old_ip_address}" ]; then
|
|
# Delete addresses/routes/arp cache.
|
|
flush_dev ${interface}
|
|
fi
|
|
|
|
if [ -n "${alias_ip_address}" ]; then
|
|
ip -4 addr add ${alias_ip_address}/${alias_prefix} broadcast ${alias_broadcast_address} dev ${interface} label ${interface}:0
|
|
ip -4 route replace ${alias_ip_address}/32 dev ${interface}
|
|
fi
|
|
|
|
exit_with_hooks 0
|
|
;;
|
|
|
|
TIMEOUT)
|
|
if [ -n "${new_routers}" ]; then
|
|
if [ -n "${alias_ip_address}" ]; then
|
|
ip -4 addr flush dev ${interface} label ${interface}:0 >/dev/null 2>&1
|
|
fi
|
|
|
|
ip -4 addr add ${new_ip_address}/${new_prefix} broadcast ${new_broadcast_address} dev ${interface}
|
|
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
|