tunneldigger: add broker_selection option to expose load balancing capabilities

Using the broker_selection param makes it possible to decide by use (default),
always use the first available broker to connect or select a random broker

See also: 51a5e46ad1/client/l2tp_client.c (L1331-L1333)

Signed-off-by: Florian Maurer <f.maurer@outlook.de>

net/tunneldigger/Makefile

@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tunneldigger
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=https://github.com/wlanslovenija/tunneldigger.git
 PKG_SOURCE_PROTO:=git

net/tunneldigger/files/config.default

@@ -5,4 +5,5 @@ config broker
 	option uuid 'abcd'
 	option interface 'l2tp0'
 	option limit_bw_down '1024'
+	option broker_selection 'usage'
 	option enabled '0'

net/tunneldigger/files/tunneldigger.init

@@ -22,6 +22,7 @@ parse_broker() {
 	config_get hook_script "$section" hook_script
 	config_get bind_interface "$section" bind_interface
 	config_get group "$section" group
+	config_get broker_selection "$section" broker_selection
 	
 	[ $enabled -eq 0 ] && return
 
@@ -38,6 +39,20 @@ parse_broker() {
 		network_get_device _bind_interface "${bind_interface}" || _bind_interface="${bind_interface}"
 		append broker_opts "-I ${_bind_interface}"
 	}
+	[ ! -z "${broker_selection}" ] && {
+		# Set broker selection.
+		case "${broker_selection}" in
+			usage)
+				append broker_opts "-a"
+			;;
+			first)
+				append broker_opts "-g"
+			;;
+			random)
+				append broker_opts "-r"
+			;;
+		esac
+	}
 
 	if [ -z "$uuid" ]; then
 		missing uuid