Import openresolv from vendor branch, actually.

Helped by:	jhb

1 files changed, 168 insertions, 0 deletions

diff --git a/contrib/openresolv/libc.in b/contrib/openresolv/libc.in
new file mode 100644
index 0000000..4ceb0d2
--- /dev/null
+++ b/contrib/openresolv/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