/lib/resolvconf/named is in openresolv 3.5.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | #!/bin/sh
# Copyright (c) 2007-2011 Roy Marples
# All rights reserved
# named subscriber for resolvconf
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[ -f "/etc"/resolvconf.conf ] || exit 0
. "/etc/resolvconf.conf" || exit 1
[ -z "$named_zones" -a -z "$named_options" ] && exit 0
[ -z "$RESOLVCONF" ] && eval "$(/sbin/resolvconf -v)"
NL="
"
# Platform specific kludges
if [ -z "$named_service" -a -z "$named_restart" -a \
	-d "/etc/init.d" -a ! -x "/etc/init.d"/named ]
then
	if [ -x "/etc/init.d"/bind9 ]; then
		# Debian and derivatives
		named_service=bind9
	fi
fi
: ${named_service:=named}
: ${named_restart:=if /usr/sbin/invoke-rc.d --quiet ${named_service} status >/dev/null 2>&1; then /usr/sbin/invoke-rc.d ${named_service} restart; fi}
newoptions="# Generated by resolvconf$NL"
newzones="$newoptions"
forward=
for n in $NAMESERVERS; do
	case "$forward" in
	*"$NL	$n;"*);;
	*) forward="$forward$NL	$n;";;
	esac
done
if [ -n "$forward" ]; then
	newoptions="${newoptions}forward first;${NL}forwarders {$forward${NL}};$NL"
fi
for d in $DOMAINS; do
	newzones="${newzones}zone \"${d%%:*}\" {$NL"
	newzones="$newzones	type forward;$NL"
	newzones="$newzones	forward first;$NL	forwarders {$NL"
	ns="${d#*:}"
	while [ -n "$ns" ]; do
		newzones="$newzones		${ns%%,*};$NL"
		[ "$ns" = "${ns#*,}" ] && break
		ns="${ns#*,}"
	done
	newzones="$newzones	};$NL};$NL"
done
# Try to ensure that config dirs exist
if type config_mkdirs >/dev/null 2>&1; then
	config_mkdirs "$named_options" "$named_zones"
else
	/sbin/resolvconf -D "$named_options" "$named_zones"
fi
# No point in changing files or reloading bind if the end result has not
# changed
changed=false
if [ -n "$named_options" ]; then
	if [ ! -f "$named_options" ] || \
		[ "$(cat "$named_options")" != "$(printf %s "$newoptions")" ]
	then
		printf %s "$newoptions" >"$named_options"
		changed=true
	fi
fi
if [ -n "$named_zones" ]; then
	if [ ! -f "$named_zones" ] || \
		[ "$(cat "$named_zones")" != "$(printf %s "$newzones")" ]
	then
		printf %s "$newzones" >"$named_zones"
		changed=true
	fi
fi
if $changed; then
	eval $named_restart
fi
 |