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|
#!/bin/sh
#
# nsdc.sh -- a shell script to manage the beast
#
# Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
#
# See LICENSE for the license.
#
# (numbers are runlevels startpriority killpriority).
# chkconfig: 2345 45 74
# description: NSD, authoritative only high performance name server.
# configuration file default
configfile="/etc/nsd.conf"
# The directory where NSD binaries reside
sbindir="/usr/sbin"
#
# You sure heard this many times before: NO USER SERVICEABLE PARTS BELOW
#
# see if user selects a different config file, with -c <filename>
if test "x$1" = "x-c"; then
shift
if [ -e $1 ]; then
configfile=$1
shift
else
echo "`basename $0`: Config file "$1" does not exist."
exit 1
fi
fi
# locate nsd-checkconf : in sbindir, PATH, nsdc_dir or .
nsd_checkconf=""
if [ -e ${sbindir}/nsd-checkconf ]; then
nsd_checkconf=${sbindir}/nsd-checkconf
else
if which nsd-checkconf >/dev/null 2>&1 ; then
if which nsd-checkconf 2>&1 | grep "^[Nn]o " >/dev/null; then
nsd_checkconf=""
else
nsd_checkconf=`which nsd-checkconf`
fi
fi
if [ -z "${nsd_checkconf}" -a -e `dirname $0`/nsd-checkconf ]; then
nsd_checkconf=`dirname $0`/nsd-checkconf
fi
if [ -z "${nsd_checkconf}" -a -e ./nsd-checkconf ]; then
nsd_checkconf=./nsd-checkconf
fi
if [ -z "${nsd_checkconf}" ]; then
echo "`basename $0`: Could not find nsd programs" \
"in $sbindir, in PATH=$PATH, in cwd=`pwd`," \
"or in dir of nsdc=`dirname $0`"
exit 1
fi
fi
usage() {
echo "Usage: `basename $0` [-c configfile] {start|stop|reload|restart|"
echo " running}"
echo "options:"
echo " -c configfile Use specified configfile (default: @nsdconfigfile@)."
echo "commands:"
echo " start Start nsd server."
echo " stop Stop nsd server."
echo " reload Nsd server reloads database file."
echo " restart Stop the nsd server and start it again."
echo " running Prints message and exit nonzero if server not running."
}
# check the config syntax before using it
${nsd_checkconf} ${configfile}
if test $? -ne 0 ; then
usage
exit 1
fi
# Read some settings from the config file.
pidfile=`${nsd_checkconf} -o pidfile ${configfile}`
zonesdir=`${nsd_checkconf} -o zonesdir ${configfile}`
sbindir=`dirname ${nsd_checkconf}`
# move to zonesdir (if specified), and make absolute pathnames.
if test -n "${zonesdir}"; then
zonesdir=`dirname ${zonesdir}/.`
if echo "${zonesdir}" | grep "^[^/]" >/dev/null; then
zonesdir=`pwd`/${zonesdir}
fi
if echo "${pidfile}" | grep "^[^/]" >/dev/null; then
pidfile=${zonesdir}/${pidfile}
fi
fi
# for bash: -C or noclobber. For tcsh: noclobber. For bourne: -C.
noclobber_set="set -C"
# ugly check for tcsh
if echo @shell@ | grep tcsh >/dev/null; then
noclobber_set="set noclobber"
fi
#
# useful routines
#
signal() {
if [ -s ${pidfile} ]
then
kill -"$1" `cat ${pidfile}` && return 0
else
echo "nsd is not running"
fi
return 1
}
do_start() {
if test -x ${sbindir}/nsd; then
${sbindir}/nsd -c ${configfile}
test $? = 0 || (echo "nsd startup failed."; exit 1)
else
echo "${sbindir}/nsd not an executable file, nsd startup failed."; exit 1
fi
}
controlled_sleep() {
if [ $1 -ge 25 ]; then
sleep 1
fi
}
controlled_stop() {
pid=$1
try=1
while [ $try -ne 0 ]; do
if [ ${try} -gt 50 ]; then
echo "nsdc stop failed"
return 1
else
if [ $try -eq 1 ]; then
kill -TERM ${pid}
else
kill -TERM ${pid} >/dev/null 2>&1
fi
# really stopped?
kill -0 ${pid} >/dev/null 2>&1
if [ $? -eq 0 ]; then
controlled_sleep ${try}
try=`expr ${try} + 1`
else
try=0
fi
fi
done
rm -f ${pidfile}
return 0
}
do_controlled_stop() {
if [ -s ${pidfile} ]; then
pid=`cat ${pidfile}`
controlled_stop ${pid} && return 0
else
echo "nsd is not running, starting anyway" && return 0
fi
return 1
}
do_stop() {
signal "TERM"
rm -f ${pidfile}
}
do_reload() {
signal "HUP"
}
case "$1" in
start)
if test -s ${pidfile} && kill -"0" `cat ${pidfile}`
then
(echo "process `cat ${pidfile}` exists, please use restart"; exit 1)
else
do_start
fi
;;
stop)
do_stop
;;
stats)
signal "USR1"
;;
reload)
do_reload
;;
running)
signal "0"
;;
restart)
do_controlled_stop && do_start
;;
*)
usage
;;
esac
exit $?
|
