Adds new REST API v2/

Addresses #5269

scripts/lua/rest/v2/get/interface/arp.lua

@@ -0,0 +1,67 @@
+--
+-- (C) 2013-21 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+require "lua_utils"
+local rest_utils = require("rest_utils")
+
+local json = require("dkjson")
+
+-- Parameters used for the rest answer --
+local rc
+local res = {}
+
+--interface.select(ifname)
+local ifid = _GET["ifid"]
+local host_info = url2hostinfo(_GET)
+
+-- #####################################################################
+
+local is_host
+local stats
+local table = {}
+
+if isEmptyString(ifid) then
+    rc = rest_utils.consts.err.invalid_interface
+    rest_utils.answer(rc)
+    return
+ end
+
+if(host_info["host"] ~= nil) then
+   local breakdown = {}
+
+   -- Show ARP sent/recv breakdown
+   stats = interface.getMacInfo(host_info["host"])
+
+   if stats ~= nil then
+      local arp_sent = stats["arp_requests.sent"] + stats["arp_replies.sent"]
+      local arp_rcvd = stats["arp_requests.rcvd"] + stats["arp_replies.rcvd"]
+
+      breakdown[#breakdown + 1] = {label=i18n("sent"), value=arp_sent}
+      breakdown[#breakdown + 1] = {label=i18n("received"), value=arp_rcvd}
+   end
+
+   print(json.encode(breakdown, nil))
+else
+   -- Show ARP stats for interface
+   stats = interface.getStats()
+
+   for k,v in pairs(stats) do
+      if k == "arp.requests" then
+         res[#res + 1] = {}
+         res[#res]["type"] = i18n("details.arp_requests")
+         res[#res]["packets"] = v
+      end
+      if k == "arp.replies" then
+         res[#res + 1] = {}
+         res[#res]["type"] = i18n("details.arp_replies")
+         res[#res]["packets"] = v
+      end
+   end
+
+   rc = rest_utils.consts.success.ok
+   rest_utils.answer(rc, res)
+end