xref: /src/etc/rc.d/named

#!/bin/sh
#
# $NetBSD: named,v 1.27 2021/03/31 04:57:25 christos Exp $
#

# PROVIDE: named
# REQUIRE: NETWORKING mountcritremote syslogd
# BEFORE:  DAEMON
# KEYWORD: chrootdir

$_rc_subr_loaded . /etc/rc.subr

name="named"
rcvar=$name
command="/usr/sbin/${name}"
pidfile="/var/run/${name}/${name}.pid"
start_precmd="named_precmd"
extra_commands="reload"
required_dirs="$named_chrootdir"	# if it is set, it must exist

named_migrate()
{
	local src="$1"
	local dst="$2$1"
	echo "Migrating $src to $dst"
(
	diff=false
	cd "$src"
	mkdir -p "$dst"
	for f in $(find . -type f)
	do
		f="${f##./}"
		case "$f" in
		*/*)
			ds="$(dirname "$f")"
			dd="$dst/$ds"
			mkdir -p "$dd"
			chmod "$(stat -f "%p" "$ds" |
			    sed -e 's/.*\([0-7][0-7][0-7][0-7]\)$/\1/g')" "$dd"
			chown "$(stat -f %u:%g "$ds")" "$dd"
			;;
		*)
			;;
		esac
		if [ -r "$dst/$f" ]
		then
			if ! cmp "$f" "$dst/$f"; then
				diff=true
			fi
		else
			cp -p "$f" "$dst/$f"
		fi
	done
	if $diff; then
		echo "Cannot complete migration because files are different"
		echo "Run 'diff -r $src $dst' resolve the differences"
	else
		rm -fr "$src"
		ln -s "$dst" "$src"
	fi
)
}

copy_if_newer()
{
	local chrootdir="$1"
	local dir="$2"
	local file="$3"
	if [ ! -x "${chrootdir}${dir}/${file}" -o \
	    "${chrootdir}${dir}/${file}" -ot "${dir}/${file}" ]; then
		rm -f "${chrootdir}${dir}/${file}"
		cp -p "${dir}/${file}" "${chrootdir}${dir}/${file}"
	fi
}

named_precmd()
{
	if [ ! -e "/etc/rndc.key" ]; then
		echo "Generating rndc.key"
		/usr/sbin/rndc-confgen -a
	fi

	if [ -z "$named_chrootdir" ]; then
		if [ ! -d "/etc/namedb/keys" ]; then
			mkdir -m 775 "/etc/namedb/keys"
			chown named:named "/etc/namedb/keys"
		fi
		return 0;
	fi

	# If running in a chroot cage, ensure that the appropriate files
	# exist inside the cage, as well as helper symlinks into the cage
	# from outside.
	#
	# As this is called after the is_running and required_dir checks
	# are made in run_rc_command(), we can safely assume ${named_chrootdir}
	# exists and named isn't running at this point (unless forcestart
	# is used).
	#
	case "$($command -v)" in
	BIND*)	# 9 no group, named-xfer, or ndc
		named_plugindir="/usr/libexec/named"
		if [ ! -d "${named_chrootdir}${named_plugindir}" ]; then
		    mkdir -p -m 755 "${named_chrootdir}${named_plugindir}"
		    chown root:wheel "${named_chrootdir}${named_plugindir}"
		fi
		for p in filter-aaaa.so; do
			copy_if_newer "${named_chrootdir}" \
			    "${named_plugindir}" "$p"
		done
		;;
	named*)	# 4 and 8
		rc_flags="-g named $rc_flags"
		copy_if_newer "${named_chrootdir}" "/usr/libexec" "named-xfer"
		ln -fs "${named_chrootdir}/var/run/ndc" /var/run/ndc
		;;
	esac

	for i in null random urandom; do
		if [ ! -c "${named_chrootdir}/dev/$i" ]; then
			rm -f "${named_chrootdir}/dev/$i"
			(cd /dev &&
			    /bin/pax -rw -pe "$i" "${named_chrootdir}/dev")
		fi
	done

	if [ ! -h /etc/namedb ]; then
		named_migrate /etc/namedb ${named_chrootdir}
	fi

	for i in named.conf rndc.key; do
		if [ \( -r "/etc/$i" \) -a \( ! -h "/etc/$i" \) -a \
		     \( ! -r "${named_chrootdir}/etc/$i" \) ]; then
			mv "/etc/$i" "${named_chrootdir}/etc/$i"
			ln -s "${named_chrootdir}/etc/$i" "/etc/$i"
		fi
	done

	if [ \( ! -r ${named_chrootdir}/etc/named.conf \) -a \
	    \( -r ${named_chrootdir}/etc/namedb/named.conf \) ]; then
		ln -s namedb/named.conf ${named_chrootdir}/etc
	fi

	if [ -f /etc/localtime ]; then
		cmp -s /etc/localtime "${named_chrootdir}/etc/localtime" || \
		    cp -p /etc/localtime "${named_chrootdir}/etc/localtime"
	fi

	local piddir="$(dirname "${pidfile}")"
	mkdir -p "${named_chrootdir}${piddir}" "${piddir}"
	chmod 755 "${named_chrootdir}${piddir}" "${piddir}"
	chown named:named "${named_chrootdir}${piddir}" "${piddir}"
	ln -fs "${named_chrootdir}${pidfile}" "${pidfile}"

	#	Change run_rc_commands()'s internal copy of $named_flags
	#
	rc_flags="-u named -t ${named_chrootdir} $rc_flags"
}

load_rc_config $name
run_rc_command "$1"