1#!/bin/sh 2# Copyright (c) 2007-2011 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 name_servers="$(key_get_value "nameserver " "$base")" 84 domain="$(key_get_value "domain " "$base")" 85 search_domains="$(key_get_value "search " "$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: ${list_resolv:=@PREFIX@/sbin/resolvconf -l} 101if [ "${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 "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)" 134 newsearch="$(uniqify $search_domains $SEARCH $search_domains_append)" 135 NS="$LOCALNAMESERVERS $NAMESERVERS" 136 newns="$(uniqify $name_servers $NS $name_servers_append)" 137 138 # Hold our new resolv.conf in a variable to save on temporary files 139 newconf="# Generated by resolvconf$NL" 140 if [ -n "$resolv_conf_head" ]; then 141 newconf="$newconf$resolv_conf_head$NL" 142 fi 143 144 [ -n "$domain" ] && newconf="${newconf}domain $domain$NL" 145 if [ -n "$newsearch" -a "$newsearch" != "$domain" ]; then 146 newconf="${newconf}search $newsearch$NL" 147 fi 148 for n in $newns; do 149 newconf="${newconf}nameserver $n$NL" 150 done 151 152 # Now add anything we don't care about such as sortlist and options 153 stuff="$($list_resolv | keys_remove nameserver domain search)" 154 if [ -n "$stuff" ]; then 155 newconf="$newconf$stuff$NL" 156 fi 157 158 # Append any user defined ones 159 if [ -n "$resolv_conf_options" ]; then 160 newconf="${newconf}options $resolv_conf_options$NL" 161 fi 162 if [ -n "$resolv_conf_sortlist" ]; then 163 newconf="${newconf}sortlist $resolv_conf_sortlist$NL" 164 fi 165 166 if [ -n "$resolv_conf_tail" ]; then 167 newconf="$newconf$resolv_conf_tail$NL" 168 fi 169 ;; 170esac 171 172# Check if the file has actually changed or not 173if [ -e "$resolv_conf" ]; then 174 [ "$(cat "$resolv_conf")" = "$(printf %s "$newconf")" ] && exit 0 175fi 176 177# Create our resolv.conf now 178(umask 022; printf %s "$newconf" >"$resolv_conf") 179eval $libc_restart 180 181retval=0 182# Notify users of the resolver 183for script in "$LIBEXECDIR"/libc.d/*; do 184 if [ -f "$script" ]; then 185 if [ -x "$script" ]; then 186 "$script" "$@" 187 else 188 (. "$script") 189 fi 190 retval=$(($retval + $?)) 191 fi 192done 193exit $retval 194