Add sent/received ARP stats for NetworkInterfaces and add a sent/recv pie chart for hosts

scripts/lua/get_arp_data.lua

@@ -0,0 +1,35 @@
+--
+-- (C) 2013-17 - ntop.org
+--
+
+dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+require "lua_utils"
+sendHTTPHeader('text/html; charset=iso-8859-1')
+local json = require("dkjson")
+
+interface.select(ifname)
+host_info = url2hostinfo(_GET)
+
+-- #####################################################################
+
+local is_host
+
+if(host_info["host"] ~= nil) then
+   -- Show ARP sent/recv breakdown 
+   stats = interface.getMacInfo(host_info["host"], host_info["vlan"])
+   local arp_sent = stats["arp_requests.sent"] + stats["arp_replies.sent"]
+   local arp_rcvd = stats["arp_requests.rcvd"] + stats["arp_replies.rcvd"]
+
+   local breakdown = {}
+   breakdown[#breakdown + 1] = {label=i18n("sent"), value=arp_sent}
+   breakdown[#breakdown + 1] = {label=i18n("received"), value=arp_rcvd}
+   print(json.encode(breakdown, nil))
+else
+   -- Show ARP stats for interface
+   stats = interface.getStats()
+
+   print('<tr><th>'..i18n("graphs.arp_requests").."</th><td align=right>"..formatPackets(stats["arp.requests"]).."</td></tr>")
+   print('<tr><th>'..i18n("graphs.arp_replies").."</th><td align=right>"..formatPackets(stats["arp.replies"]).."</td></tr>")
+end