[packages] ntpclient: add option to bind ntpclient to a specific interface (#6470)

git-svn-id: svn://svn.openwrt.org/openwrt/packages@19134 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/ntpclient/files/ntpclient.config

@@ -20,3 +20,4 @@ config ntpdrift
 config ntpclient
 	option interval	600
 	#option count	10
+	#option interface wan

net/ntpclient/files/ntpclient.hotplug

@@ -7,14 +7,26 @@ unset SERVER
 unset PORT
 unset INTERVAL
 unset COUNT
+unset INTERFACE_GLOBAL
+
 NTPC=`which ntpclient`
 
 check_server() {
 	local hostname
 	local port
+	local interface
 	[ -n "$SERVER" ] && return
 	config_get hostname $1 hostname
 	config_get port $1 port
+	config_get interface $1 interface
+
+	[ -z "$interface" ] && interface=$INTERFACE_GLOBAL
+
+	[ -n "$interface" ] && {
+		# $INTERFACE is passed from hotplug event
+		[ "$interface" = "$INTERFACE" ] || return
+	}
+
 	[ -z "$hostname" ] && return
 	$NTPC -c 1 -p ${port:-123} -i 2 -h $hostname > /dev/null && { SERVER=$hostname; PORT=${port:-123}; }
 }
@@ -44,9 +56,11 @@ load_settings() {
 	
 	config_get interval $1 interval
 	config_get count $1 count
+	config_get interface $1 interface
 	
 	[ -n "$count" ] && COUNT=$count
 	[ -n "$interval" ] && INTERVAL=$interval
+	[ -n "$interface" ] && INTERFACE_GLOBAL=$interface
 }
 
 config_load ntpclient