Add rest/v2/get/pcap/live_traffic.lua endpoint

scripts/lua/rest/v2/get/pcap/live_traffic.lua

@@ -0,0 +1,55 @@
+--
+-- (C) 2013-22 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+require "lua_utils"
+local json = require "dkjson"
+
+local function send_error(error_type)
+   local msg = i18n("live_traffic.error_generic")
+   if error_type == "not_found" then
+      msg = i18n("live_traffic.error_not_found")
+   elseif error_type == "not_granted" then
+      msg = i18n("live_traffic.error_not_granted")
+   end
+
+   sendHTTPContentTypeHeader('application/json')
+   print(json.encode({error = msg}))
+end
+
+local function send_status(status_type)
+   sendHTTPContentTypeHeader('application/json')
+   print(json.encode({status = status_type}))
+end
+
+interface.select(ifname)
+
+if not ntop.isPcapDownloadAllowed() then
+   send_error("not_granted")
+else
+   local host       = _GET["host"]
+   local duration   = tonumber(_GET["duration"])
+   local bpf_filter = _GET["bpf_filter"]
+   local fname      = ifname
+
+   if(host ~= nil) then
+      fname = fname .. "_"..host
+   end
+
+   if((bpf_filter ~= nil) and (bpf_filter ~= "")) then
+      fname = fname .. "_filtered"
+   end
+
+   fname = fname .."_live.pcap"
+
+   if((duration == nil) or (duration < 0) or (duration > 600)) then
+      duration = 60
+   end
+
+   sendHTTPContentTypeHeader('application/vnd.tcpdump.pcap', 'attachment; filename="'..fname..'"')
+
+   interface.liveCapture(host, duration, bpf_filter)
+end