diff options
Diffstat (limited to 'libc.in')
| -rw-r--r-- | libc.in | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/libc.in b/libc.in new file mode 100644 index 000000000000..4ceb0d2d038f --- /dev/null +++ b/libc.in @@ -0,0 +1,168 @@ +#!/bin/sh +# Copyright (c) 2007-2009 Roy Marples +# All rights reserved + +# libc 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. + +SYSCONFDIR=@SYSCONFDIR@ +LIBEXECDIR=@LIBEXECDIR@ +VARDIR=@VARDIR@ +IFACEDIR="$VARDIR/interfaces" + +# sed may not be available, and this is faster on small files +key_get_value() +{ + local key="$1" value= x= line= + + shift + if [ $# -eq 0 ]; then + while read line; do + case "$line" in + "$key"*) echo "${line##$key}";; + esac + done + else + for x; do + while read line; do + case "$line" in + "$key"*) echo "${line##$key}";; + esac + done < "$x" + done + fi +} + +# Support original resolvconf configuration layout +# as well as the openresolv config file +if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then + . "$SYSCONFDIR"/resolvconf.conf +elif [ -d "$SYSCONFDIR"/resolvconf ]; then + SYSCONFDIR="$SYSCONFDIR/resolvconf/resolv.conf.d" + base="$SYSCONFDIR/resolv.conf.d/base" + if [ -f "$base" ]; then + name_servers="$(key_get_value "nameserver " "$base")" + search_domains="$(key_get_value "search " "$base")" + if [ -z "$search_domains" ]; then + search_domains="$(key_get_value "domain " "$base")" + fi + resolv_conf_options="$(key_get_value "options " "$base")" + fi + if [ -f "$SYSCONFDIR"/resolv.conf.d/head ]; then + resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.d/head)" + fi + if [ -f "$SYSCONFDIR"/resolv.conf.d/tail ]; then + resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.d/tail)" + fi +fi +: ${resolv_conf:=/etc/resolv.conf} +: ${libc_service:=nscd} +: ${libc_restart:=@RESTARTCMD ${libc_service}@} +: ${list_resolv:=@PREFIX@/sbin/resolvconf -l} +if [ "${resolv_conf_head-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.head ]; then + resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.head)" +fi +if [ "${resolv_conf_tail-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.tail ]; then + resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.tail)" +fi + +uniqify() +{ + local result= + while [ -n "$1" ]; do + case " $result " in + *" $1 "*);; + *) result="$result $1";; + esac + shift + done + echo "${result# *}" +} + +case "${resolv_conf_passthrough:-NO}" in +[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) + newest= + for conf in "$IFACEDIR"/*; do + if [ -z "$newest" -o "$conf" -nt "$newest" ]; then + newest="$conf" + fi + done + [ -z "$newest" ] && exit 0 + newconf="$(cat "$newest")\n" + ;; +*) + [ -z "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)" + newsearch="$(uniqify $search_domains $SEARCH $search_domains_append)" + NS="$LOCALNAMESERVERS $NAMESERVERS" + newns="$(uniqify $name_servers $NS $name_servers_append)" + + # Hold our new resolv.conf in a variable to save on temporary files + newconf="# Generated by resolvconf\n" + if [ -n "$resolv_conf_head" ]; then + newconf="$newconf$resolv_conf_head\n" + fi + [ -n "$newsearch" ] && newconf="${newconf}search $newsearch\n" + for n in $newns; do + newconf="${newconf}nameserver $n\n" + done + + # Now get any configured options + opts="$resolv_conf_options${resolv_conf_options:+ }" + opts="$opts$($list_resolv | key_get_value "options ")" + if [ -n "$opts" ]; then + newconf="${newconf}options" + for opt in $(uniqify $opts); do + newconf="${newconf} $opt" + done + newconf="$newconf\n" + fi + + if [ -n "$resolv_conf_tail" ]; then + newconf="$newconf$resolv_conf_tail\n" + fi + ;; +esac + +# Check if the file has actually changed or not +if [ -e "$resolv_conf" ]; then + [ "$(cat "$resolv_conf")" = "$(printf "$newconf")" ] && exit 0 +fi + +# Create our resolv.conf now +(umask 022; printf "$newconf" >"$resolv_conf") +eval $libc_restart + +retval=0 +# Notify users of the resolver +for script in "$LIBEXECDIR"/libc.d/*; do + if [ -f "$script" ]; then + if [ -x "$script" ]; then + "$script" "$@" + else + (. "$script" "$@") + fi + retval=$(($retval + $?)) + fi +done +exit $retval |