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253 lines
6.6 KiB
Bash
253 lines
6.6 KiB
Bash
#!/bin/sh
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# Copyright (c) 2007-2019 Roy Marples
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# All rights reserved
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# libc subscriber for resolvconf
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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SYSCONFDIR=@SYSCONFDIR@
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LIBEXECDIR=@LIBEXECDIR@
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VARDIR=@VARDIR@
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IFACEDIR="$VARDIR/interfaces"
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NL="
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"
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# sed may not be available, and this is faster on small files
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key_get_value()
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{
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key="$1"
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shift
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if [ $# -eq 0 ]; then
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while read -r line; do
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case "$line" in
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"$key"*) echo "${line##$key}";;
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esac
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done
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else
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for x do
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while read -r line; do
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case "$line" in
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"$key"*) echo "${line##$key}";;
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esac
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done < "$x"
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done
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fi
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}
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keys_remove()
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{
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while read -r line; do
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found=false
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for key do
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case "$line" in
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"$key"*|"#"*|" "*|" "*|"") found=true;;
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esac
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$found && break
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done
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$found || echo "$line"
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done
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}
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local_nameservers="127.* 0.0.0.0 255.255.255.255 ::1"
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# Support original resolvconf configuration layout
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# as well as the openresolv config file
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if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then
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. "$SYSCONFDIR"/resolvconf.conf
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elif [ -d "$SYSCONFDIR"/resolvconf ]; then
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SYSCONFDIR="$SYSCONFDIR/resolvconf"
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base="$SYSCONFDIR/resolv.conf.d/base"
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if [ -f "$base" ]; then
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prepend_nameservers="$(key_get_value "nameserver " "$base")"
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domain="$(key_get_value "domain " "$base")"
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prepend_search="$(key_get_value "search " "$base")"
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resolv_conf_options="$(key_get_value "options " "$base")"
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resolv_conf_sortlist="$(key_get_value "sortlist " "$base")"
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fi
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if [ -f "$SYSCONFDIR"/resolv.conf.d/head ]; then
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resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.d/head)"
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fi
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if [ -f "$SYSCONFDIR"/resolv.conf.d/tail ]; then
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resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.d/tail)"
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fi
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fi
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: ${resolv_conf:=/etc/resolv.conf}
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: ${libc_service:=nscd}
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: ${list_resolv:=@SBINDIR@/resolvconf -l}
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if [ "${resolv_conf_head-x}" = x ] && [ -f "$SYSCONFDIR"/resolv.conf.head ]
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then
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resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.head)"
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fi
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if [ "${resolv_conf_tail-x}" = x ] && [ -f "$SYSCONFDIR"/resolv.conf.tail ]
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then
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resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.tail)"
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fi
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backup=true
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signature="# Generated by resolvconf"
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uniqify()
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{
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result=
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while [ -n "$1" ]; do
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case " $result " in
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*" $1 "*);;
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*) result="$result $1";;
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esac
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shift
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done
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echo "${result# *}"
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}
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case "${resolv_conf_passthrough:-NO}" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
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backup=false
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newest=
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for conf in "$IFACEDIR"/*; do
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if [ -z "$newest" ] || [ "$conf" -nt "$newest" ]; then
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newest="$conf"
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fi
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done
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[ -z "$newest" ] && exit 0
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newconf="$(cat "$newest")$NL"
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;;
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/dev/null|[Nn][Uu][Ll][Ll])
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: ${resolv_conf_local_only:=NO}
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if [ "$local_nameservers" = "127.* 0.0.0.0 255.255.255.255 ::1" ]; then
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local_nameservers=
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fi
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# Need to overwrite our variables.
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eval "$(@SBINDIR@/resolvconf -V)"
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;;
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*)
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[ -z "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)"
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;;
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esac
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case "${resolv_conf_passthrough:-NO}" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) ;;
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*)
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: ${domain:=$DOMAIN}
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newsearch="$(uniqify $prepend_search $SEARCH $append_search)"
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NS="$LOCALNAMESERVERS $NAMESERVERS"
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newns=
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gotlocal=false
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for n in $(uniqify $prepend_nameservers $NS $append_nameservers); do
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add=true
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islocal=false
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for l in $local_nameservers; do
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case "$n" in
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$l) islocal=true; gotlocal=true; break;;
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esac
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done
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if ! $islocal; then
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case "${resolv_conf_local_only:-YES}" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
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$gotlocal && add=false;;
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esac
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fi
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$add && newns="$newns $n"
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done
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# Hold our new resolv.conf in a variable to save on temporary files
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newconf="$signature$NL"
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if [ -n "$resolv_conf_head" ]; then
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newconf="$newconf$resolv_conf_head$NL"
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fi
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[ -n "$domain" ] && newconf="${newconf}domain $domain$NL"
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if [ -n "$newsearch" ] && [ "$newsearch" != "$domain" ]; then
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newconf="${newconf}search $newsearch$NL"
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fi
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for n in $newns; do
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newconf="${newconf}nameserver $n$NL"
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done
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# Now add anything we don't care about such as sortlist and options
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stuff="$($list_resolv | keys_remove nameserver domain search)"
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if [ -n "$stuff" ]; then
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newconf="$newconf$stuff$NL"
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fi
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# Append any user defined ones
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if [ -n "$resolv_conf_options" ]; then
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newconf="${newconf}options $resolv_conf_options$NL"
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fi
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if [ -n "$resolv_conf_sortlist" ]; then
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newconf="${newconf}sortlist $resolv_conf_sortlist$NL"
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fi
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if [ -n "$resolv_conf_tail" ]; then
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newconf="$newconf$resolv_conf_tail$NL"
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fi
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;;
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esac
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# Check if the file has actually changed or not
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if [ -e "$resolv_conf" ]; then
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[ "$(cat "$resolv_conf")" = "$(printf %s "$newconf")" ] && exit 0
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fi
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# Change is good.
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# If the old file does not have our signature, back it up.
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# If the new file just has our signature, restore the backup.
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if $backup; then
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if [ "$newconf" = "$signature$NL" ]; then
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if [ -e "$resolv_conf.bak" ]; then
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newconf="$(cat "$resolv_conf.bak")$NL"
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fi
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elif [ -e "$resolv_conf" ]; then
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read line <"$resolv_conf"
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if [ "$line" != "$signature" ]; then
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cp "$resolv_conf" "$resolv_conf.bak"
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fi
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fi
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fi
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# Create our resolv.conf now
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(umask 022; echo "$newconf" >"$resolv_conf")
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if [ -n "$libc_restart" ]; then
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eval $libc_restart
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elif [ -n "$RESTARTCMD" ]; then
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set -- ${libc_service}
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eval "$RESTARTCMD"
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else
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@SBINDIR@/resolvconf -r ${libc_service}
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fi
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retval=0
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# Notify users of the resolver
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for script in "$LIBEXECDIR"/libc.d/*; do
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if [ -f "$script" ]; then
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if [ -x "$script" ]; then
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"$script" "$@"
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else
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(. "$script")
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fi
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retval=$(($retval + $?))
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fi
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done
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exit $retval
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