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--
-- (C) 2017 - ntop.org
--
-- This plugin is part of nDPI (https://github.com/ntop/nDPI)
--
--
local ndpi_proto = Proto("ndpi", "nDPI", "nDPI Protocol Interpreter")
ndpi_proto.fields = {}
local fds = ndpi_proto.fields
fds.network_protocol = ProtoField.new("nDPI Network Protocol", "ndpi.protocol.network", ftypes.UINT8, nil, base.DEC)
fds.application_protocol = ProtoField.new("nDPI Application Protocol", "ndpi.protocol.application", ftypes.UINT8, nil, base.DEC)
fds.name = ProtoField.new("nDPI Protocol Name", "ndpi.protocol.name", ftypes.STRING)
local f_eth_trailer = Field.new("eth.trailer")
local ndpi_protos = {}
local ndpi_flows = {}
local num_ndpi_flows = 0
local lower_ndpi_flow_id = 0
local lower_ndpi_flow_volume = 0
local compute_flows_stats = true
local max_num_entries = 10
local max_num_flows = 50
-- ###############################################
function round(num, idp) return tonumber(string.format("%." .. (idp or 0) .. "f", num)) end
-- Convert bytes to human readable format
function bytesToSize(bytes)
if(bytes == nil) then
return("0")
else
precision = 2
kilobyte = 1024;
megabyte = kilobyte * 1024;
gigabyte = megabyte * 1024;
terabyte = gigabyte * 1024;
bytes = tonumber(bytes)
if((bytes >= 0) and (bytes < kilobyte)) then
return round(bytes, precision) .. " Bytes";
elseif((bytes >= kilobyte) and (bytes < megabyte)) then
return round(bytes / kilobyte, precision) .. ' KB';
elseif((bytes >= megabyte) and (bytes < gigabyte)) then
return round(bytes / megabyte, precision) .. ' MB';
elseif((bytes >= gigabyte) and (bytes < terabyte)) then
return round(bytes / gigabyte, precision) .. ' GB';
elseif(bytes >= terabyte) then
return round(bytes / terabyte, precision) .. ' TB';
else
return round(bytes, precision) .. ' Bytes';
end
end
end
function pairsByValues(t, f)
local a = {}
for n in pairs(t) do table.insert(a, n) end
table.sort(a, function(x, y) return f(t[x], t[y]) end)
local i = 0 -- iterator variable
local iter = function () -- iterator function
i = i + 1
if a[i] == nil then return nil
else return a[i], t[a[i]]
end
end
return iter
end
function asc(a,b) return (a < b) end
function rev(a,b) return (a > b) end
-- ###############################################
function ndpi_proto.init()
ndpi_protos = {}
ndpi_flows = {}
end
function slen(str)
local i = 1
local len = 0
local zero = string.char(0)
for i = 1, 16 do
local c = str:sub(i,i)
if(c ~= zero) then
len = len + 1
else
break
end
end
return(str:sub(1, len))
end
-- the dissector function callback
function ndpi_proto.dissector(tvb, pinfo, tree)
local pktlen = tvb:len()
local eth_trailer = f_eth_trailer()
local magic = tostring(tvb(pktlen-28,4))
if(magic == "19680924") then
local ndpi_subtree = tree:add(ndpi_proto, tvb(), "nDPI Protocol")
local network_protocol = tvb(pktlen-24,2)
local application_protocol = tvb(pktlen-22,2)
local name = tvb(pktlen-20,16)
local name_str = name:string(ENC_ASCII)
local ndpikey, srckey, dstkey, flowkey
ndpi_subtree:add(fds.network_protocol, network_protocol)
ndpi_subtree:add(fds.application_protocol, application_protocol)
ndpi_subtree:add(fds.name, name)
local pname = ""..application_protocol
if(pname ~= "0000") then
-- Set protocol name in the wireshark protocol column (if not Unknown)
pinfo.cols.protocol = name_str
end
if(compute_flows_stats) then
ndpikey = tostring(slen(name_str))
if(ndpi_protos[ndpikey] == nil) then ndpi_protos[ndpikey] = 0 end
ndpi_protos[ndpikey] = ndpi_protos[ndpikey] + pinfo.len
srckey = tostring(pinfo.src)
dstkey = tostring(pinfo.dst)
flowkey = srckey.." / "..dstkey.." ["..ndpikey.."]"
if(ndpi_flows[flowkey] == nil) then
ndpi_flows[flowkey] = 0
num_ndpi_flows = num_ndpi_flows + 1
if(num_ndpi_flows > max_num_flows) then
-- We need to harvest the flow with least packets beside this new one
local tot_removed = 0
for k,v in pairsByValues(ndpi_flows, asc) do
if(k ~= flowkey) then
table.remove(ndpi_flows, k)
tot_removed = tot_removed + 1
if(tot_removed == max_num_entries) then
break
end
end
end
end
end
ndpi_flows[flowkey] = ndpi_flows[flowkey] + pinfo.len
end
end
end
register_postdissector(ndpi_proto)
-- ###############################################
local function ndpi_dialog_menu()
local win = TextWindow.new("nDPI Protocol Statistics");
local label = ""
local i
if(ndpi_protos ~= {}) then
label = "nDPI Protocol Breakdown\n"
label = label .. "-----------------------\n"
i = 0
for k,v in pairsByValues(ndpi_protos, rev) do
-- label = label .. k .. "\t".. bytesToSize(v) .. "\n"
label = label .. string.format("%-32s\t%s\n", k, bytesToSize(v))
if(i == max_num_entries) then break else i = i + 1 end
end
-- #######
label = label .. "\nTop nDPI Flows\n"
label = label .. "-----------\n"
i = 0
for k,v in pairsByValues(ndpi_flows, rev) do
label = label .. string.format("%-32s\t%s\n", k, bytesToSize(v))
if(i == max_num_entries) then break else i = i + 1 end
end
win:set(label)
end
end
if(compute_flows_stats) then
register_menu("nDPI", ndpi_dialog_menu, MENU_STAT_UNSORTED)
end
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