#!/bin/bash

#

# nis.sh: dhclient-script plugin for NIS settings,

#         place in /etc/dhcp/dhclient.d and 'chmod +x nis.sh' to enable

#

# 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>

CONF=/etc/yp.conf

SAVECONF=${SAVEDIR}/${CONF##*/}.predhclient.${interface}

fix_context() {

    if [ -x /sbin/restorecon ]; then

        /sbin/restorecon ${1} >/dev/null 2>&1

    fi

}

save_config_file() {

    if [ ! -d ${SAVEDIR} ]; then

        mkdir -p ${SAVEDIR}

    fi

    if [ -e ${CONF} ]; then

        # cp+rm instead of mv: preserve SELinux context

        # rhbz#509240

        # Do not rely on restorecon.

        cp -c ${CONF} ${SAVECONF}

        rm ${CONF}

    else

        echo > ${SAVECONF}

        # Try restorecon

        fix_context ${SAVECONF}

    fi

}

nis_config() {

    if [ ! "${PEERNIS}" = "no" ]; then

        if [ -n "${new_nis_domain}" ]; then

            domainname "${new_nis_domain}"

            save_config_file

            echo '# generated by /sbin/dhclient-script' > ${CONF}

            fix_context ${CONF}

            if [ -n "${new_nis_servers}" ]; then

                for i in ${new_nis_servers} ; do

                    echo "domain ${new_nis_domain} server ${i}" >> ${CONF}

                done

            else

                echo "domain ${new_nis_domain} broadcast" >> ${CONF}

            fi

        elif [ -n "${new_nis_servers}" ]; then

            save_config_file

            echo '# generated by /sbin/dhclient-script' > ${CONF}

            fix_context ${CONF}

            for i in ${new_nis_servers} ; do

                echo "ypserver ${i}" >> ${CONF}

            done

        fi

		# dimainname or servers changed, restart ypbind

		if [ "${old_nis_domain}" != "${new_nis_domain}" ] \

			|| [ "${old_nis_servers}" != "${new_nis_servers}" ] 

		then

                service ypbind condrestart >/dev/null 2>&1

		fi

    fi

}

nis_restore() {

    if [ ! "${PEERNIS}" = "no" ]; then

        if [ -f ${SAVECONF} ]; then

            rm -f ${CONF}

            # cp+rm instead of mv: preserve SELinux context

            # rhbz#509240

            cp -c ${SAVECONF} ${CONF}

            rm ${SAVECONF}

            fix_context ${CONF} # Restorecon again to be sure.

            service ypbind condrestart >/dev/null 2>&1

        fi

    fi

}

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