From 7f0eb037a2d85cfb4f8befd26b38eaedc0e02908 Mon Sep 17 00:00:00 2001
From: jow <jow@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Fri, 7 May 2010 01:17:47 +0000
Subject: [package] base-files: add add_dns() and remove_dns() helpers to
 network config, useful to merge dns entries from multiple interfaces

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21391 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 package/base-files/files/lib/network/config.sh | 29 ++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'package/base-files/files')

diff --git a/package/base-files/files/lib/network/config.sh b/package/base-files/files/lib/network/config.sh
index 4336244f6e..1a77145f5a 100755
--- a/package/base-files/files/lib/network/config.sh
+++ b/package/base-files/files/lib/network/config.sh
@@ -66,6 +66,35 @@ add_vlan() {
 	return 1
 }
 
+# add dns entries if they are not in resolv.conf yet
+add_dns() {
+	local cfg="$1"; shift
+
+	local dns
+	local add
+	for dns in "$@"; do
+		grep -qsF "nameserver $dns" /tmp/resolv.conf.auto || {
+			add="${add:+$add }$dns"
+			echo "nameserver $dns" >> /tmp/resolv.conf.auto
+		}
+	done
+
+	uci_set_state network "$cfg" dns "$add"
+}
+
+# remove dns entries of the given iface
+remove_dns() {
+	local cfg="$1"
+
+	local dns
+	config_get dns "$cfg" dns
+	for dns in $dns; do
+		sed -i -e "/^nameserver $dns$/d" /tmp/resolv.conf.auto
+	done
+
+	uci_revert_state network "$cfg" dns
+}
+
 # sort the device list, drop duplicates
 sort_list() {
 	local arg="$*"
-- 
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