cdcc09a23b
IFNAMSIZ or shorter (#441524) - Change to /etc/sysconfig/network-scripts in dhclient-script before calling need_config or source_config (#496233)
559 lines
17 KiB
Bash
Executable File
559 lines
17 KiB
Bash
Executable File
#!/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 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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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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fix_context() {
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if [ -x /sbin/restorecon ]; then
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/sbin/restorecon ${1} >/dev/null 2>&1
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fi
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}
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save_previous() {
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origfile="${1}"
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savefile="${SAVEDIR}/${origfile##*/}.predhclient.${interface}"
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if [ ! -d ${SAVEDIR} ]; then
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mkdir -p ${SAVEDIR}
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fi
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if [ -e ${origfile} ]; then
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mv ${origfile} ${savefile}
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else
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echo > ${savefile}
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fi
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fix_context ${savefile}
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}
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make_resolv_conf() {
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[ "${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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save_previous /etc/resolv.conf
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rscf="$(mktemp /tmp/XXXXXX)"
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echo "; generated by /sbin/dhclient-script" > ${rscf}
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if [ -n "${SEARCH}" ]; then
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echo "search ${SEARCH}" >> $rscf
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else
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if [ -n "${new_domain_search}" ]; then
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echo "search ${new_domain_search//\\032/ }" >> ${rscf}
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elif [ -n "${new_domain_name}" ]; then
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echo "search ${new_domain_name//\\032/ }" >> ${rscf}
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fi
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fi
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if [ -n "${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 ${rscf}
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fix_context /etc/resolv.conf
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fi
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}
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exit_with_hooks() {
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exit_status="${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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mask() {
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ip="${1}"
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m="${2}"
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let ip="$(IFS="." ip2num ${ip})"
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let m="$(IFS="." ip2num ${m})"
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let n="ip & m"
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num2ip ${n}
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}
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class_bits() {
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let ip=$(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="$(mask ${router} ${new_subnet_mask})"
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mysubnet="$(mask ${new_ip_address} ${new_subnet_mask})"
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unreachable=0
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if [ ! "${routersubnet}" = "${mysubnet}" ]; then
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unreachable=1
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if arping -f -q -I ${interface} -w2 ${router}; then
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ip route add ${router}/32 dev ${interface}
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if [ $? -eq 0 ]; then
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unreachable=0
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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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fi
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else
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unreachable=1
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logmessage "DHCP router ${router} is unreachable on DHCP subnet ${mysubnet} router subnet ${routersubnet}"
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fi
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fi
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return ${unreachable}
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}
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add_default_gateway() {
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router="${1}"
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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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if is_router_reachable ${router} ; then
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ip 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} ${metric}"
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return 1
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else
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return 0
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fi
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fi
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return 1
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}
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dhconfig() {
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if [ -n "${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 -family inet addr del ${old_ip_address} dev ${interface}:0
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fi
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if [ -n "${old_ip_address}" ] &&
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[ ! "${old_ip_address}" = "${new_ip_address}" ]; then
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# IP address changed. Bringing down the interface will delete all
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# routes, and clear the ARP cache.
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ip -family inet addr flush dev ${interface} >/dev/null 2>&1
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fi
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if [ "${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 -family inet addr add ${new_ip_address}/${new_prefix} broadcast ${new_broadcast_address} dev ${interface}
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ip -family inet link set dev ${interface} up
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if [ -n "${new_interface_mtu}" ]; then
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ip link set ${interface} mtu ${new_interface_mtu}
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fi
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if [ -x ${ETCDIR}/dhclient-${interface}-up-hooks ]; then
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. ${ETCDIR}/dhclient-${interface}-up-hooks
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elif [ -x ${ETCDIR}/dhclient-up-hooks ]; then
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. ${ETCDIR}/dhclient-up-hooks
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fi
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if [[ (( -z "${GATEWAYDEV}" ) ||
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( "${GATEWAYDEV}" = "${interface}" )) &&
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(( -z "$GATEWAY" ) ||
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(( -n "$DHCLIENT_IGNORE_GATEWAY" ) &&
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( "$DHCLIENT_IGNORE_GATEWAY" = [Yy]* ))) ]]; then
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metric="${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 [[ (( -z "${GATEWAYDEV}" ) ||
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( "${GATEWAYDEV}" = "${interface}" )) &&
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( -n "${GATEWAY}" ) ]]; then
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routersubnet=$(mask ${GATEWAY} ${new_subnet_mask})
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mysubnet=$(mask ${new_ip_address} ${new_subnet_mask})
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if [ "${routersubnet}" = "${mysubnet}" ]; then
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ip route replace default via ${GATEWAY} dev ${interface}
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fi
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fi
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# static routes
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if [ -n "${new_static_routes}" ]; then
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IFS=', |' static_routes=(${new_static_routes})
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route_targets=()
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for((i=0; i<${#static_routes[@]}; i+=2)); do
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target=${static_routes[$i]}
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gateway=${static_routes[$i+1]}
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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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if is_router_reachable ${gateway}; then
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ip route replace ${target}/$(class_bits ${target}) via ${gateway} dev ${interface} ${metric}
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if [ $? -ne 0 ]; then
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logmessage "failed to create static route: ${target}/$(class_bits ${target}) via ${gateway} dev ${interface} ${metric}"
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else
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route_targets=(${route_targets[@]} ${target})
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fi
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fi
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done
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fi
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fi
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if [ ! "${new_ip_address}" = "${alias_ip_address}" ] &&
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[ -n "${alias_ip_address}" ]; then
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ip -family inet addr flush dev ${interface}:0 >/dev/null 2>&1
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ip -family inet addr add ${alias_ip_address}/${alias_prefix} dev ${interface}:0
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ip route replace ${alias_ip_address}/32 dev ${interface}:0
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fi
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make_resolv_conf
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if [ -n "${new_host_name}" ] && need_hostname; then
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hostname ${new_host_name}
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fi
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if [ -n "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" ] &&
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[[ "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" = [yY1]* ]]; then
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if [ -n "${new_time_offset}" ]; then
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# DHCP option "time-offset" is requested by default and should be
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# handled. The geographical zone abbreviation cannot be determined
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# from the GMT offset, but the $ZONEINFO/Etc/GMT$offset file can be
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# used - note: this disables DST.
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((z=new_time_offset/3600))
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((hoursWest=$(printf '%+d' $z)))
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if (( $hoursWest < 0 )); then
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# tzdata treats negative 'hours west' as positive 'gmtoff'!
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((hoursWest*=-1))
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fi
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tzfile=/usr/share/zoneinfo/Etc/GMT$(printf '%+d' ${hoursWest})
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if [ -e ${tzfile} ]; then
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save_previous /etc/localtime
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cp -fp ${tzfile} /etc/localtime
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touch /etc/localtime
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fix_context /etc/localtime
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fi
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fi
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fi
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# execute any additional client side configuration scripts we have
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if [ -d ${ETCDIR}/dhclient.d ]; 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}_config"
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fi
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done
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fi
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}
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get_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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ipcalc -s -p ${ip} ${nm} | cut -d '=' -f 2
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fi
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}
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#
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# ### MAIN
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#
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if [ -x ${ETCDIR}/dhclient-enter-hooks ]; then
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exit_status=0
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# dhclient-enter-hooks can abort dhclient-script by setting
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# the exit_status variable to a non-zero value
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. ${ETCDIR}/dhclient-enter-hooks
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if [ ${exit_status} -ne 0 ]; then
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exit ${exit_status}
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fi
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fi
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if [ ! -r /etc/sysconfig/network-scripts/network-functions ]; then
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echo "Missing /etc/sysconfig/network-scripts/network-functions, exiting." >&2
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exit 1
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fi
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if [ ! -r /etc/rc.d/init.d/functions ]; then
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echo "Missing /etc/rc.d/init.d/functions, exiting." >&2
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exit 1
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fi
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. /etc/sysconfig/network-scripts/network-functions
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. /etc/rc.d/init.d/functions
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if [ -f /etc/sysconfig/network ]; then
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. /etc/sysconfig/network
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fi
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if [ -f /etc/sysconfig/networking/network ]; then
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. /etc/sysconfig/networking/network
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fi
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cd /etc/sysconfig/network-scripts
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CONFIG="ifcfg-${interface}"
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need_config ${CONFIG}
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source_config >/dev/null 2>&1
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new_prefix="$(get_prefix ${new_ip_address} ${new_subnet_mask})"
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old_prefix="$(get_prefix ${old_ip_address} ${new_subnet_mask})"
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alias_prefix="$(get_prefix ${alias_ip_address} ${alias_subnet_mask})"
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case "${reason}" in
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MEDIUM)
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# Linux doesn't handle mediums (media)
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exit_with_hooks 0
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;;
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PREINIT)
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if [ -n "${alias_ip_address}" ]; then
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# Bring down alias interface, its routes will disappear too.
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ip -family inet link set ${interface}:0 down
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fi
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if [ "${keep_old_ip}" = "yes" ]; then
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ip -family inet link set ${interface} up
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else
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ip -family inet addr flush dev ${interface} >/dev/null 2>&1
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ip -family inet link set ${interface} up
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fi
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if [ -n "${DHCLIENT_DELAY}" ] && [ ${DHCLIENT_DELAY} -gt 0 ]; then
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sleep ${DHCLIENT_DELAY}
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fi
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exit_with_hooks 0
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;;
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ARPCHECK|ARPSEND)
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if [ -z "${new_ip_address}" ] || [ -z "${interface}" ] ||
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arping -q -f -c 2 -w 3 -D -I ${interface} ${new_ip_address}; then
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exit_with_hooks 0
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else
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exit_with_hooks 1
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fi
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;;
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BOUND|RENEW|REBIND|REBOOT)
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dhconfig
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exit_with_hooks 0
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;;
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EXPIRE|FAIL|RELEASE|STOP)
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# only restore config files if there are no other dhclient processes
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# running (#306381)
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any_other_clients="$(ps -eo pid,ppid,comm | grep dhclient | grep -v ${PPID})"
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if [ -n "${any_other_clients}" ]; then
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if [ -f ${SAVEDIR}/resolv.conf.predhclient.${interface} ]; then
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change_resolv_conf ${SAVEDIR}/resolv.conf.predhclient.${interface}
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rm -f ${SAVEDIR}/resolv.conf.predhclient.${interface}
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fi
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if [ -n "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" ] &&
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[[ "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" = [yY1]* ]]; then
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if [ -e ${SAVEDIR}/localtime.predhclient.${interface} ]; then
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rm -f /etc/localtime
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mv ${SAVEDIR}/localtime.predhclient.${interface} /etc/localtime
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touch /etc/localtime
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fix_context /etc/localtime
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fi
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fi
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fi
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# execute any additional client side configuration scripts we have
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if [ -d ${ETCDIR}/dhclient.d ]; 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}_restore"
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fi
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done
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fi
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if [ -x ${ETCDIR}/dhclient-${interface}-down-hooks ]; then
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. ${ETCDIR}/dhclient-${interface}-down-hooks
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elif [ -x ${ETCDIR}/dhclient-down-hooks ]; then
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. ${ETCDIR}/dhclient-down-hooks
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fi
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if [ -n "${alias_ip_address}" ]; then
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# Turn off alias interface
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ip -family inet link set ${interface}:0 down
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fi
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if [ -n "${old_ip_address}" ]; then
|
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# Shut down interface, which will delete routes and clear arp cache.
|
|
ip -family inet addr flush dev ${interface} >/dev/null 2>&1
|
|
ip -family inet link set ${interface} down
|
|
fi
|
|
|
|
if [ -n "${alias_ip_address}" ]; then
|
|
ip -family inet addr add ${alias_ip_address}/${alias_prefix} dev ${interface}:0
|
|
ip -family inet route replace ${alias_ip_address}/32 ${interface}:0
|
|
fi
|
|
|
|
exit_with_hooks 0
|
|
;;
|
|
|
|
TIMEOUT)
|
|
if [ -n "${new_routers}" ]; then
|
|
if [ -n "${alias_ip_address}" ]; then
|
|
ip -family inet addr flush dev ${interface}:0 >/dev/null 2>&1
|
|
fi
|
|
|
|
ip -family inet 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
|
|
|
|
ip -family inet addr flush dev ${interface} >/dev/null 2>&1
|
|
ip -family inet link set ${interface} down
|
|
exit_with_hooks 1
|
|
else
|
|
exit_with_hooks 1
|
|
fi
|
|
;;
|
|
|
|
*)
|
|
logmessage "unhandled state: ${reason}"
|
|
exit_with_hooks 1
|
|
;;
|
|
esac
|
|
|
|
exit_with_hooks 0
|