From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 17 Feb 2009 18:53:40 +0000 (+0100)
Subject: Added a dhclient script.
X-Git-Tag: v3.0-alpha1~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12573d1f0f205cc8b86491e4c8445eb5da7af9fe;p=ipfire-3.x.git

Added a dhclient script.
---

diff --git a/config/dhcp/dhclient-script b/config/dhcp/dhclient-script
new file mode 100644
index 000000000..5008b0bc9
--- /dev/null
+++ b/config/dhcp/dhclient-script
@@ -0,0 +1,597 @@
+#!/bin/bash
+#
+# dhclient-script: Network interface configuration script run by
+#                  dhclient based on DHCP client communication
+#
+# Copyright (C) 2008 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>
+#
+# ----------
+# 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
+SAVEDIR=/var/lib/dhclient
+
+LOGFACILITY="local7"
+LOGLEVEL="notice"
+
+logmessage() {
+    msg="${1}"
+    logger -p ${LOGFACILITY}.${LOGLEVEL} -t "NET" "dhclient: ${msg}"
+}
+
+save_previous() {
+    origfile="${1}"
+    savefile="${SAVEDIR}/${origfile##*/}.predhclient.${interface}"
+
+    if [ ! -d ${SAVEDIR} ]; then
+        mkdir -p ${SAVEDIR}
+    fi
+
+    if [ -e ${origfile} ]; then
+        mv ${origfile} ${savefile}
+    else
+        echo > ${savefile}
+    fi
+
+    restorecon ${savefile} >/dev/null 2>&1
+}
+
+make_resolv_conf() {
+    [ "${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
+        save_previous /etc/resolv.conf
+        rscf="$(mktemp /tmp/XXXXXX)"
+        echo "; generated by /sbin/dhclient-script" > ${rscf}
+
+        if [ -n "${SEARCH}" ]; then
+            echo "search ${SEARCH}" >> $rscf
+        else
+            if [ -n "${new_domain_search}" ]; then
+                echo "search ${new_domain_search//\\032/ }" >> ${rscf}
+            elif [ -n "${new_domain_name}" ]; then
+                echo "search ${new_domain_name//\\032/ }" >> ${rscf}
+            fi
+        fi
+
+        if [ -n "${RES_OPTIONS}" ]; then
+            echo "options ${RES_OPTIONS}" >> ${rscf}
+        fi
+
+        for nameserver in ${new_domain_name_servers} ; do
+            echo "nameserver ${nameserver}" >> ${rscf}
+        done
+
+        change_resolv_conf ${rscf}
+        rm -f ${rscf}
+
+        if [ -x /sbin/restorecon ]; then
+            /sbin/restorecon /etc/resolv.conf >/dev/null 2>&1
+        fi
+    fi
+}
+
+exit_with_hooks() {
+    exit_status="${1}"
+
+    if [ -x /etc/dhclient-exit-hooks ]; then
+        . /etc/dhclient-exit-hooks
+    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}"
+}
+
+mask() {
+    ip="${1}"
+    m="${2}"
+    let ip="$(IFS="." ip2num ${ip})"
+    let m="$(IFS="." ip2num ${m})"
+    let n="ip & m"
+    num2ip ${n}
+}
+
+class_bits() {
+    let ip=$(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="$(mask ${router} ${new_subnet_mask})"
+    mysubnet="$(mask ${new_ip_address} ${new_subnet_mask})"
+    unreachable=0
+
+    if [ ! "${routersubnet}" = "${mysubnet}" ]; then
+        unreachable=1
+        if arping -f -q -I ${interface} -w2 ${router}; then
+            ip route add ${router}/32 dev ${interface}
+            if [ $? -eq 0 ]; then
+                unreachable=0
+            else
+                logmessage "failed to create host router for unreachable router ${router} not on subnet ${mysubnet}"
+            fi
+        else
+            unreachable=1
+            logmessage "DHCP router ${router} is unreachable on DHCP subnet ${mysubnet} router subnet ${routersubnet}"
+        fi
+    fi
+
+    return ${unreachable}
+}
+
+add_default_gateway() {
+    router="${1}"
+    metric=""
+
+    if [ $# -gt 1 ] && [ ${2} -gt 0 ]; then
+        metric="metric ${2}"
+    fi
+
+    if is_router_reachable ${router} ; then
+        ip route replace default via ${router} dev ${interface} ${metric}
+        if [ $? -ne 0 ]; then
+            logmessage "failed to create default route: ${router} dev ${interface} ${metric}"
+            return 1
+        else
+            return 0
+        fi
+    fi
+
+    return 1
+}
+
+dhconfig() {
+    if [ -n "${old_ip_address}" ] && [ -n "${alias_ip_address}" ] &&
+       [ ! "${alias_ip_address}" = "${old_ip_address}" ]; then
+        # possible new alias, remove old alias first
+        ip -family inet addr del ${old_ip_address} dev ${interface}:0
+    fi
+
+    if [ -n "${old_ip_address}" ] &&
+       [ ! "${old_ip_address}" = "${new_ip_address}" ]; then
+        # IP address changed.  Bringing down the interface will delete all
+        # routes, and clear the ARP cache.
+        ip -family inet addr flush dev ${interface} >/dev/null 2>&1
+        ip -family inet link set dev ${interface} down
+    fi
+
+    if [ "${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
+        ip -family inet addr add ${new_ip_address}/${new_prefix} broadcast ${new_broadcast_address} dev ${interface}
+
+        if [ -n "${new_interface_mtu}" ]; then
+            ip link set ${interface} mtu ${new_interface_mtu}
+        fi
+
+        if [ -x /etc/dhclient-${interface}-up-hooks ]; then
+            . /etc/dhclient-${interface}-up-hooks
+        elif [ -x /etc/dhclient-up-hooks ]; then
+            . /etc/dhclient-up-hooks
+        fi
+
+        if [[ (( -z "${GATEWAYDEV}" ) ||
+               ( "${GATEWAYDEV}" = "${interface}" )) &&
+              (( -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 [[ (( -z "${GATEWAYDEV}" ) ||
+                 ( "${GATEWAYDEV}" = "${interface}" )) &&
+                ( -n "${GATEWAY}" ) ]]; then
+            routersubnet=$(mask ${GATEWAY} ${new_subnet_mask})
+            mysubnet=$(mask ${new_ip_address} ${new_subnet_mask})
+
+            if [ "${routersubnet}" = "${mysubnet}" ]; then
+                ip route replace default via ${GATEWAY} dev ${interface}
+            fi
+        fi
+
+        # static routes
+        if [ -n "${new_static_routes}" ]; then
+            IFS=', |' static_routes=(${new_static_routes})
+            route_targets=()
+
+            for((i=0; i<${#static_routes[@]}; i+=2)); do
+                target=${static_routes[$i]}
+                gateway=${static_routes[$i+1]}
+                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
+
+                if is_router_reachable ${gateway}; then
+                    ip route replace ${target}/$(class_bits ${target}) via ${gateway} dev ${interface} ${metric}
+
+                    if [ $? -ne 0 ]; then
+                        logmessage "failed to create static route: ${target}/$(class_bits ${target}) via ${gateway} dev ${interface} ${metric}"
+                    else
+                        route_targets=(${route_targets[@]} ${target})
+                    fi
+                fi
+            done
+        fi
+    fi
+
+    if [ ! "${new_ip_address}" = "${alias_ip_address}" ] &&
+       [ -n "${alias_ip_address}" ]; then
+        ip -family inet addr flush dev ${interface}:0 >/dev/null 2>&1
+        ip -family inet addr add ${alias_ip_address}/${alias_prefix} dev ${interface}:0
+        ip route replace ${alias_ip_address}/32 dev ${interface}:0
+    fi
+
+    make_resolv_conf
+
+    if [ -n "${new_host_name}" ] && need_hostname; then
+        hostname ${new_host_name}
+    fi
+
+    if [ ! "${PEERNIS}" = "no" ]; then
+        if [ -n "${new_nis_domain}" ]; then
+            domainname "${new_nis_domain}"
+            save_previous /etc/yp.conf
+            let contents=0
+            echo '# generated by /sbin/dhclient-script' > /etc/yp.conf
+
+            if [ -n "${new_nis_servers}" ]; then
+                for i in ${new_nis_servers} ; do
+                    echo "domain ${new_nis_domain} server ${i}" >> /etc/yp.conf
+                    let contents=contents+1
+                done
+            else
+                echo "domain ${new_nis_domain} broadcast" >> /etc/yp.conf
+                let contents=contents+1
+            fi
+
+            if [ ${contents} -gt 0 ]; then
+                if [ -x /etc/rc.d/init.d/ypbind ] &&
+                   [ -r /var/run/ypbind.pid ]; then
+                    service ypbind restart >/dev/null 2>&1
+                fi
+            fi
+        elif [ -n "${new_nis_servers}" ]; then
+            save_previous /etc/yp.conf
+            echo '# generated by /sbin/dhclient-script' > /etc/yp.conf
+            let contents=0
+
+            for i in ${new_nis_servers} ; do
+                echo "ypserver ${i}" >> /etc/yp.conf
+                let contents=contents+1
+            done
+
+            if [ $contents -gt 0 ]; then
+                if [ -x /etc/rc.d/init.d/ypbind ] &&
+                   [ -r /var/run/ypbind.pid ]; then
+                    service ypbind restart >/dev/null 2>&1
+                fi
+            fi
+        fi
+    fi
+
+    if [ -n "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" ] &&
+       [[ "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" = [yY1]* ]]; then
+        if [ -n "${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
+                save_previous /etc/localtime
+                cp -fp ${tzfile} /etc/localtime
+                touch /etc/localtime
+            fi
+        fi
+    fi
+
+    if [ ! "${PEERNTP}" = "no" ] &&
+       [ -n "${new_ntp_servers}" ] && [ -e /etc/ntp.conf ]; then
+        save_previous /etc/ntp.conf
+        egrep -v '^server .*  # added by /sbin/dhclient-script$'< ${SAVEDIR}/ntp.conf.predhclient.${interface} > /etc/ntp.conf
+        restorecon /etc/ntp.conf >/dev/null 2>&1
+
+        for s in ${new_ntp_servers} ; do
+            echo "server ${s}  # added by /sbin/dhclient-script" >> /etc/ntp.conf
+        done
+
+        diff -q /etc/ntp.conf ${SAVEDIR}/ntp.conf.predhclient.${interface} >/dev/null 2>&1
+        if [ $? -eq 1 ]; then
+            service ntpd condrestart >/dev/null 2>&1
+        fi
+    fi
+}
+
+get_prefix() {
+    ip="${1}"
+    nm="${2}"
+
+    if [ -n "${ip}" -a -n "${nm}" ]; then
+        ipcalc -s -p ${ip} ${nm} | cut -d '=' -f 2
+    fi
+}
+
+
+#
+# ### MAIN
+#
+
+if [ -x /etc/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
+    . /etc/dhclient-enter-hooks
+    if [ ${exit_status} -ne 0 ]; then
+        exit ${exit_status}
+    fi
+fi
+
+if [ ! -r /etc/sysconfig/network-scripts/network-functions ]; then
+    echo "Missing /etc/sysconfig/network-scripts/network-functions, exiting." >&2
+    exit 1
+fi
+
+if [ ! -r /etc/rc.d/init.d/functions ]; then
+    echo "Missing /etc/rc.d/init.d/functions, exiting." >&2
+    exit 1
+fi
+
+. /etc/sysconfig/network-scripts/network-functions
+. /etc/rc.d/init.d/functions
+
+if [ -f /etc/sysconfig/network ]; then
+    . /etc/sysconfig/network
+fi
+
+if [ -f /etc/sysconfig/networking/network ]; then
+    . /etc/sysconfig/networking/network
+fi
+
+CONFIG="/etc/sysconfig/network-scripts/ifcfg-${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} ${new_subnet_mask})"
+alias_prefix="$(get_prefix ${alias_ip_address} ${alias_subnet_mask})"
+
+case "${reason}" in
+    MEDIUM)
+        # Linux doesn't handle mediums (media)
+        exit_with_hooks 0
+        ;;
+
+    PREINIT)
+        if [ -n "${alias_ip_address}" ]; then
+            # Bring down alias interface, its routes will disappear too.
+            ip -family inet link set ${interface}:0 down
+        fi
+
+        if [ "${keep_old_ip}" = "yes" ]; then
+            ip -family inet link set ${interface} up
+        else
+            ip -family inet addr flush dev ${interface} >/dev/null 2>&1
+            ip -family inet link set ${interface} up
+        fi
+
+        if [ -n "${DHCLIENT_DELAY}" ] && [ ${DHCLIENT_DELAY} -gt 0 ]; then
+            sleep ${DHCLIENT_DELAY}
+        fi
+
+        exit_with_hooks 0
+        ;;
+
+    ARPCHECK|ARPSEND)
+        if [ -z "${new_ip_address}" ] || [ -z "${interface}" ] ||
+           arping -q -f -c 2 -w 3 -D -I ${interface} ${new_ip_address}; then
+            exit_with_hooks 0
+        else
+            exit_with_hooks 1
+        fi
+        ;;
+
+    BOUND|RENEW|REBIND|REBOOT)
+        dhconfig
+        exit_with_hooks 0
+        ;;
+
+    EXPIRE|FAIL|RELEASE|STOP)
+        # only restore config files if there are no other dhclient processes
+        # running (#306381)
+        any_other_clients="$(ps -eo pid,ppid,comm | grep dhclient | grep -v ${PPID})"
+        if [ -n "${any_other_clients}" ]; then
+            if [ -f ${SAVEDIR}/resolv.conf.predhclient.${interface} ]; then
+                change_resolv_conf ${SAVEDIR}/resolv.conf.predhclient.${interface}
+                rm -f ${SAVEDIR}/resolv.conf.predhclient.${interface}
+            fi
+
+            if [ -n "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" ] &&
+               [[ "${DHCP_TIME_OFFSET_SETS_TIMEZONE}" = [yY1]* ]]; then
+                if [ -e ${SAVEDIR}/localtime.predhclient.${interface} ]; then
+                    rm -f /etc/localtime
+                    mv ${SAVEDIR}/localtime.predhclient.${interface} /etc/localtime
+                    touch /etc/localtime
+                fi
+            fi
+
+            if [ -f ${SAVEDIR}/ntp.conf.predhclient.${interface} ]; then
+                rm -f /etc/ntp.conf
+                mv -f ${SAVEDIR}/ntp.conf.predhclient.${interface} /etc/ntp.conf
+                service ntpd condrestart >/dev/null 2>&1
+            fi
+
+            if [ -f ${SAVEDIR}/yp.conf.predhclient.${interface} ]; then
+                rm -f /etc/yp.conf
+                mv -f ${SAVEDIR}/yp.conf.predhclient.${interface} /etc/yp.conf
+                if [ -x /etc/rc.d/init.d/ypbind ] && [ -r /var/run/ypbind.pid ]; then
+                    service ypbind restart >/dev/null 2>&1
+                fi
+            fi
+        fi
+
+        if [ -x /etc/dhclient-${interface}-down-hooks ]; then
+            . /etc/dhclient-${interface}-down-hooks
+        elif [ -x /etc/dhclient-down-hooks ]; then
+            . /etc/dhclient-down-hooks
+        fi
+
+        if [ -n "${alias_ip_address}" ]; then
+            # Turn off alias interface
+            ip -family inet link set ${interface}:0 down
+        fi
+
+        if [ -n "${old_ip_address}" ]; then
+            # 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
diff --git a/lfs/dhcp b/lfs/dhcp
index 57acbe563..14aba0bff 100644
--- a/lfs/dhcp
+++ b/lfs/dhcp
@@ -97,6 +97,8 @@ $(OBJECT): $(objects)
 	mv -v /usr/sbin/dhclient /sbin
 	ln -sf $(CONFIG_ROOT)/dhcp/dhcpd.conf /etc/dhcpd.conf
 
+	install -v -m 755 $(DIR_CONFIG)/$(PKG_NAME)/dhclient-script /sbin/dhclient-script
+
 	@$(INSTALL_INITSCRIPT)
 
 	@rm -rf $(DIR_APP)