#!/usr/bin/lua

local util = require "luci.util"
local jsonc = require "luci.jsonc"

local eth_info = {}
local ifname, stat
for ifname, stat in pairs(util.ubus("network.device", "status")) do
	if ifname:match("^(eth%d+)$") == ifname or ifname:match("^(usb%d+)$") or ifname:match("^(lan%d+)$") or ifname:match("wan") == ifname then
		eth_info[#eth_info + 1] = {
			device = ifname
		}
	end
end

table.sort(
	eth_info,
	function(a, b)
		return a.device < b.device
	end
)

print(jsonc.stringify(eth_info))