171 lines
4.9 KiB
Bash
171 lines
4.9 KiB
Bash
#!/bin/sh
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# Copyright (c) 2007-2009 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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local key="$1" value= x= line=
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shift
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if [ $# -eq 0 ]; then
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while read line; do
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case "$line" in
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"$key"*) echo "${line##$key}";;
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esac
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done
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else
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for x; do
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while read line; do
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case "$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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# 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/resolv.conf.d"
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base="$SYSCONFDIR/resolv.conf.d/base"
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if [ -f "$base" ]; then
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name_servers="$(key_get_value "nameserver " "$base")"
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search_domains="$(key_get_value "search " "$base")"
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if [ -z "$search_domains" ]; then
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search_domains="$(key_get_value "domain " "$base")"
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fi
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resolv_conf_options="$(key_get_value "options " "$base")"
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fi
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if [ -f "$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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: ${libc_restart:=@RESTARTCMD ${libc_service}@}
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: ${list_resolv:=@PREFIX@/sbin/resolvconf -l}
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if [ "${resolv_conf_head-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.head ]; then
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resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.head)"
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fi
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if [ "${resolv_conf_tail-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.tail ]; then
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resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.tail)"
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fi
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uniqify()
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{
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local 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 "${resolv_conf_passthrough:-NO}" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
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newest=
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for conf in "$IFACEDIR"/*; do
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if [ -z "$newest" -o "$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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*)
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[ -z "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)"
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newsearch="$(uniqify $search_domains $SEARCH $search_domains_append)"
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NS="$LOCALNAMESERVERS $NAMESERVERS"
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newns="$(uniqify $name_servers $NS $name_servers_append)"
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# Hold our new resolv.conf in a variable to save on temporary files
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newconf="# Generated by resolvconf$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 "$newsearch" ] && newconf="${newconf}search $newsearch$NL"
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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 get any configured options
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opts="$resolv_conf_options${resolv_conf_options:+ }"
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opts="$opts$($list_resolv | key_get_value "options ")"
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if [ -n "$opts" ]; then
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newconf="${newconf}options"
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for opt in $(uniqify $opts); do
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newconf="${newconf} $opt"
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done
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newconf="$newconf$NL"
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fi
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if [ -n "$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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# Create our resolv.conf now
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(umask 022; echo "$newconf" >"$resolv_conf")
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eval $libc_restart
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retval=0
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# Notify users of the resolver
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for script in "$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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