xref: /netbsd-src/external/bsd/openresolv/dist/libc.in (revision 413d532bcc3f62d122e56d92e13ac64825a40baf)
1#!/bin/sh
2# Copyright (c) 2007-2012 Roy Marples
3# All rights reserved
4
5# libc subscriber for resolvconf
6
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted provided that the following conditions
9# are met:
10#     * Redistributions of source code must retain the above copyright
11#       notice, this list of conditions and the following disclaimer.
12#     * Redistributions in binary form must reproduce the above
13#       copyright notice, this list of conditions and the following
14#       disclaimer in the documentation and/or other materials provided
15#       with the distribution.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29SYSCONFDIR=@SYSCONFDIR@
30LIBEXECDIR=@LIBEXECDIR@
31VARDIR=@VARDIR@
32IFACEDIR="$VARDIR/interfaces"
33NL="
34"
35
36# sed may not be available, and this is faster on small files
37key_get_value()
38{
39	local key="$1" x= line=
40
41	shift
42	if [ $# -eq 0 ]; then
43		while read -r line; do
44			case "$line" in
45			"$key"*) echo "${line##$key}";;
46			esac
47		done
48	else
49		for x do
50			while read -r line; do
51				case "$line" in
52				"$key"*) echo "${line##$key}";;
53				esac
54			done < "$x"
55		done
56	fi
57}
58
59keys_remove()
60{
61	local key x line found
62
63	while read -r line; do
64		found=false
65		for key do
66			case "$line" in
67			"$key"*|"#"*|" "*|"	"*|"") found=true;;
68			esac
69			$found && break
70		done
71		$found || echo "$line"
72	done
73}
74
75# Support original resolvconf configuration layout
76# as well as the openresolv config file
77if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then
78	. "$SYSCONFDIR"/resolvconf.conf
79elif [ -d "$SYSCONFDIR"/resolvconf ]; then
80	SYSCONFDIR="$SYSCONFDIR/resolvconf/resolv.conf.d"
81	base="$SYSCONFDIR/resolv.conf.d/base"
82	if [ -f "$base" ]; then
83		prepend_nameservers="$(key_get_value "nameserver " "$base")"
84		domain="$(key_get_value "domain " "$base")"
85		prepend_search="$(key_get_value "search " "$base")"
86		resolv_conf_options="$(key_get_value "options " "$base")"
87		resolv_conf_sortlist="$(key_get_value "sortlist " "$base")"
88	fi
89	if [ -f "$SYSCONFDIR"/resolv.conf.d/head ]; then
90		resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.d/head)"
91	fi
92	if [ -f "$SYSCONFDIR"/resolv.conf.d/tail ]; then
93		resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.d/tail)"
94	fi
95fi
96: ${domain:=$DOMAIN}
97: ${resolv_conf:=/etc/resolv.conf}
98: ${libc_service:=nscd}
99: ${libc_restart:=@RESTARTCMD ${libc_service}@}
100: ${list_resolv:=@SBINDIR@/resolvconf -l}
101if [ "${resolv_conf_head-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.head ]; then
102	resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.head)"
103fi
104if [ "${resolv_conf_tail-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.tail ]; then
105	resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.tail)"
106fi
107
108uniqify()
109{
110	local result=
111	while [ -n "$1" ]; do
112		case " $result " in
113		*" $1 "*);;
114		*) result="$result $1";;
115		esac
116		shift
117	done
118	echo "${result# *}"
119}
120
121case "${resolv_conf_passthrough:-NO}" in
122[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
123	newest=
124	for conf in "$IFACEDIR"/*; do
125		if [ -z "$newest" -o "$conf" -nt "$newest" ]; then
126			newest="$conf"
127		fi
128	done
129	[ -z "$newest" ] && exit 0
130	newconf="$(cat "$newest")$NL"
131	;;
132*)
133	[ -z "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)"
134	newsearch="$(uniqify $prepend_search $SEARCH)"
135	NS="$LOCALNAMESERVERS $NAMESERVERS"
136	newns=
137	gotlocal=false
138	for n in $(uniqify $prepend_nameservers $NS); do
139		add=true
140		case "$n" in
141		127.*|0.0.0.0|255.255.255.255|::1) gotlocal=true;;
142		*)
143			case "${resolv_conf_local_only:-YES}" in
144			[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
145				$gotlocal && add=false;;
146			esac
147		esac
148		$add && newns="$newns $n"
149	done
150
151	# Hold our new resolv.conf in a variable to save on temporary files
152	newconf="# Generated by resolvconf$NL"
153	if [ -n "$resolv_conf_head" ]; then
154		newconf="$newconf$resolv_conf_head$NL"
155	fi
156
157	[ -n "$domain" ] && newconf="${newconf}domain $domain$NL"
158	if [ -n "$newsearch" -a "$newsearch" != "$domain" ]; then
159		newconf="${newconf}search $newsearch$NL"
160	fi
161	for n in $newns; do
162		newconf="${newconf}nameserver $n$NL"
163	done
164
165	# Now add anything we don't care about such as sortlist and options
166	stuff="$($list_resolv | keys_remove nameserver domain search)"
167	if [ -n "$stuff" ]; then
168		newconf="$newconf$stuff$NL"
169	fi
170
171	# Append any user defined ones
172	if [ -n "$resolv_conf_options" ]; then
173		newconf="${newconf}options $resolv_conf_options$NL"
174	fi
175	if [ -n "$resolv_conf_sortlist" ]; then
176		newconf="${newconf}sortlist $resolv_conf_sortlist$NL"
177	fi
178
179	if [ -n "$resolv_conf_tail" ]; then
180		newconf="$newconf$resolv_conf_tail$NL"
181	fi
182	;;
183esac
184
185# Check if the file has actually changed or not
186if [ -e "$resolv_conf" ]; then
187	[ "$(cat "$resolv_conf")" = "$(printf %s "$newconf")" ] && exit 0
188fi
189
190# Create our resolv.conf now
191(umask 022; printf %s "$newconf" >"$resolv_conf")
192eval $libc_restart
193
194retval=0
195# Notify users of the resolver
196for script in "$LIBEXECDIR"/libc.d/*; do
197	if [ -f "$script" ]; then
198		if [ -x "$script" ]; then
199			"$script" "$@"
200		else
201			(. "$script")
202		fi
203		retval=$(($retval + $?))
204	fi
205done
206exit $retval
207