interface.runLiveExtraction API to extract traffic with a direct download, live_traffic_extraction.lua endpoint

scripts/lua/live_traffic_extraction.lua

@@ -0,0 +1,41 @@
+--
+-- (C) 2013-18 - ntop.org
+--
+
+dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+require "lua_utils"
+local json = require("dkjson")
+local recording_utils = require "recording_utils"
+
+local function send_error(msg)
+  sendHTTPContentTypeHeader('application/json')
+  local res = {}
+  res.error = msg
+  print(json.encode(res))
+end
+
+if not recording_utils.isAvailable() then
+  send_error(i18n("traffic_recording.not_granted"))
+else
+  if _GET["epoch_begin"] == nil or _GET["epoch_end"] == nil then
+    send_error(i18n("traffic_recording.missing_parameters"))
+  else
+    interface.select(ifname)
+
+    local filter = _GET["bpf_filter"]
+    local time_from = tonumber(_GET["epoch_begin"])
+    local time_to = tonumber(_GET["epoch_end"])
+
+    if filter == nil then
+      filter = ""
+    end
+
+    local fname = time_from.."-"..time_to..".pcap"
+    sendHTTPContentTypeHeader('application/vnd.tcpdump.pcap', 'attachment; filename="'..fname..'"')
+
+    interface.runLiveExtraction(time_from, time_to, filter)
+
+  end
+end
+