#!/bin/bash

#

# named           This shell script takes care of starting and stopping

#                 named (BIND DNS server).

#

# chkconfig: - 13 87

# description: named (BIND) is a Domain Name Server (DNS) \

# that is used to resolve host names to IP addresses.

# probe: true

### BEGIN INIT INFO

# Provides: $named

# Required-Start: $local_fs $network $syslog

# Required-Stop: $local_fs $network $syslog

# Default-Start:

# Default-Stop: 0 1 2 3 4 5 6

# Short-Description: start|stop|status|restart|try-restart|reload|force-reload DNS server

# Description: control ISC BIND implementation of DNS server

### END INIT INFO

# Source function library.

. /etc/rc.d/init.d/functions

[ -r /etc/sysconfig/named ] && . /etc/sysconfig/named

RETVAL=0

export KRB5_KTNAME=${KEYTAB_FILE:-/etc/named.keytab}

named='named'

if [ -x /usr/sbin/named-sdb ]; then

	named='named-sdb'

fi

# Don't kill named during clean-up

NAMED_SHUTDOWN_TIMEOUT=${NAMED_SHUTDOWN_TIMEOUT:-25}

if [ -n "$ROOTDIR" ]; then

   ROOTDIR=`echo $ROOTDIR | sed 's#//*#/#g;s#/$##'`;

   rdl=`/usr/bin/readlink $ROOTDIR`;

   if [ -n "$rdl" ]; then

      ROOTDIR="$rdl";

   fi;

fi

PIDFILE="/var/run/named/named.pid"

ROOTDIR_MOUNT='/etc/named /etc/pki/dnssec-keys /var/named /etc/named.conf

/etc/named.dnssec.keys /etc/named.rfc1912.zones /etc/rndc.conf /etc/rndc.key

/usr/lib64/bind /usr/lib/bind /etc/named.iscdlv.key /etc/named.root.key'

mount_chroot_conf()

{

  if [ -n "$ROOTDIR" ]; then

    for all in $ROOTDIR_MOUNT; do

      # Skip nonexistant files

      [ -e "$all" ] || continue

      # If mount source is a file

      if ! [ -d "$all" ]; then

        # mount it only if it is not present in chroot or it is empty

        if ! [ -e "$ROOTDIR$all" ] || [ `stat -c'%s' "$ROOTDIR$all"` -eq 0 ]; then

          touch "$ROOTDIR$all"

          mount --bind "$all" "$ROOTDIR$all"

        fi

      else

        # Mount source is a directory. Mount it only if directory in chroot is

        # empty.

	if [ -e "$all" ] && [ `ls -1A $ROOTDIR$all | wc -l` -eq 0 ]; then

          mount --bind "$all" "$ROOTDIR$all"

	fi

      fi

    done

  fi

}

umount_chroot_conf()

{

  for all in $ROOTDIR_MOUNT; do

    # Check if file is mount target. Do not use /proc/mounts because detecting

    # of modified mounted files can fail.

    if mount | grep -q '.* on '"$ROOTDIR$all"' .*'; then

      umount "$ROOTDIR$all"

      # Remove temporary created files

      [ -f "$all" ] && rm -f "$ROOTDIR$all"

    fi

  done

}

pidofnamed() {

	pidofproc -p "$ROOTDIR/$PIDFILE" "$named";

}

# Check if all what named needs running

start()

{

  [ "$EUID" != "0" ] && exit 4

  # Source networking configuration.

  [ -r /etc/sysconfig/network ] && . /etc/sysconfig/network

  # Check that networking is up

  [ "${NETWORKING}" = "no" ] && exit 1

  [ -x /usr/sbin/"$named" ] || exit 5

  # Handle -c option

  previous_option='unspecified';

  for a in $OPTIONS; do

    if [ $previous_option = '-c' ]; then

      named_conf=$a;

    fi;

    previous_option=$a;

  done;

  named_conf=${named_conf:-/etc/named.conf};

  mount_chroot_conf

  if [ ! -r $ROOTDIR$named_conf ]; then

    echo 'Cannot find configuration file. You could create it by system-config-bind'

    exit 6;

  fi;

  # all pre-start is done, lets start named

  echo -n $"Starting named: "

  if [ -n "`pidofnamed`" ]; then

    echo -n $"named: already running"

    success

    echo

    exit 0;

  fi;

  if ! [ "$DISABLE_ZONE_CHECKING" = yes ]; then

    ckcf_options='-z'; # enable named-checkzone for each zone (9.3.1+) !

  fi;

  if [ -n "${ROOTDIR}" -a "x${ROOTDIR}" != "x/" ]; then

    OPTIONS="${OPTIONS} -t ${ROOTDIR}"

    ckcf_options="$ckcf_options -t ${ROOTDIR}";

    [ -s /etc/localtime ] && cp -fp /etc/localtime ${ROOTDIR}/etc/localtime;

  fi

  RETVAL=0

  # check if configuration is correct

  if [ -x /usr/sbin/named-checkconf ] && [ -x /usr/sbin/named-checkzone ] && /usr/sbin/named-checkconf $ckcf_options ${named_conf} >/dev/null 2>&1; then

    daemon --pidfile "$ROOTDIR/$PIDFILE" /usr/sbin/"$named" -u named ${OPTIONS};

    RETVAL=$?

    if [ $RETVAL -eq 0 ]; then

      rm -f /var/run/{named,named-sdb}.pid;

      ln -s $ROOTDIR/"$PIDFILE" /var/run/"$named".pid;

    fi;

  else

    named_err="`/usr/sbin/named-checkconf $ckcf_options $named_conf 2>&1`";	   

    echo

    echo "Error in named configuration:";

    echo "$named_err";

    failure

    echo

    [ -x /usr/bin/logger ] && echo "$named_err" | /usr/bin/logger -pdaemon.error -tnamed;

    umount_chroot_conf

    exit 2;

  fi;

  echo

  if [ $RETVAL -eq 0 ]; then

    touch /var/lock/subsys/named;

  else

    umount_chroot_conf

    exit 7;

  fi

  return 0;

}

stop() {

  [ "$EUID" != "0" ] && exit 4

  # Stop daemons.

  echo -n $"Stopping named: "

  [ -x /usr/sbin/rndc ] && /usr/sbin/rndc stop >/dev/null 2>&1;

  RETVAL=$?

  # was rndc successful?

  [ "$RETVAL" -eq 0 ] || \

    killproc -p "$ROOTDIR/$PIDFILE" "$named" -TERM >/dev/null 2>&1

  timeout=0

  RETVAL=0

  while pidofnamed >/dev/null; do

    if [ $timeout -ge $NAMED_SHUTDOWN_TIMEOUT ]; then

      RETVAL=1

      break

    else

      sleep 2 && echo -n "."

      timeout=$((timeout+2))

    fi;

  done

  umount_chroot_conf

  # remove pid files

  if [ $RETVAL -eq 0 ]; then

    rm -f /var/lock/subsys/named

    rm -f /var/run/{named,named-sdb}.pid

  fi;

  if [ $RETVAL -eq 0 ]; then

    success

  else

    failure

    RETVAL=1

  fi;

  echo

  return $RETVAL

}

rhstatus() {

  [ -x /usr/sbin/rndc ] && /usr/sbin/rndc status;

  status -p "$ROOTDIR/$PIDFILE" /usr/sbin/"$named";

  return $?

}	

restart() {

	stop

	start

}	

reload() {

        [ "$EUID" != "0" ] && exit 

        echo -n $"Reloading "$named": "

	p=`pidofnamed`

	RETVAL=$?

	if [ "$RETVAL" -eq 0 ]; then 

	    /usr/sbin/rndc reload >/dev/null 2>&1 || /bin/kill -HUP $p;

	    RETVAL=$?

        fi

	[ "$RETVAL" -eq 0 ] && success $"$named reload" || failure $"$named reload"

        echo

	return $RETVAL

}

# See how we were called.

case "$1" in

	start)

		start

		;;

	stop)

		stop

		;;

	status)

		rhstatus;

		RETVAL=$?

		;;

	restart)

		restart

		;;

	condrestart|try-restart)

		if [ -e /var/lock/subsys/named ]; then restart; fi

                ;;

	reload)

		reload

		;;

	force-reload)

		if ! reload; then restart; fi

		;;

	*)

        	echo $"Usage: $0 {start|stop|status|restart|try-restart|reload|force-reload}"

		[ "x$1" = "x" ] && exit 0

		exit 2

esac

exit $RETVAL