Reworks plugin loading and structure

Implements #4358

scripts/plugins/alerts/security/flow_risks/user_scripts/flow/flow_risks.lua

@@ -0,0 +1,67 @@
+--
+-- (C) 2019-20 - ntop.org
+--
+
+local user_scripts = require("user_scripts")
+local flow_consts = require("flow_consts")
+local flow_risks = require("flow_risk_utils")
+
+-- #################################################################
+
+local script = {
+   -- Script category
+   category = user_scripts.script_categories.security, 
+
+   -- Priority
+   prio = -20, -- Lower priority (executed after) than default 0 priority
+
+   -- NOTE: hooks defined below
+   hooks = {},
+
+   gui = {
+      i18n_title = "flow_callbacks_config.flow_risk",
+      i18n_description = "flow_callbacks_config.flow_risk_description",
+   }
+}
+
+-- #################################################################
+
+function script.hooks.protocolDetected(now)
+   -- For value information see nDPI/src/include/ndpi_typedefs.h
+   if flow.hasRisk(flow_risks.risks.ndpi_binary_application_transfer) then
+      local http_info = flow.getHTTPInfo()
+      local url      = http_info["protos.http.last_url"] or ""
+
+      -- NDPI_BINARY_APPLICATION_TRANSFER
+      -- scripts/lua/modules/alert_definitions/alert_suspicious_file_transfer.lua
+      flow.triggerStatus(
+	 flow_consts.status_types.status_suspicious_file_transfer.create(
+	    flow_consts.status_types.status_suspicious_file_transfer.alert_severity,
+	    http_info
+	 ),
+	 200, -- flow_score
+	 200, -- cli_score
+	 200  -- srv_score
+      )
+   end
+
+   if flow.hasRisk(flow_risks.risks.ndpi_known_protocol_on_non_standard_port) then
+      -- NDPI_KNOWN_PROTOCOL_ON_NON_STANDARD_PORT
+      -- scripts/lua/modules/alert_definitions/alert_known_proto_on_non_std_port.lua
+      local info = flow.getInfo()
+
+      flow.triggerStatus(
+	 flow_consts.status_types.status_known_proto_on_non_std_port.create(
+	    flow_consts.status_types.status_known_proto_on_non_std_port.alert_severity,
+	    info
+	 ),
+	 100, -- flow_score
+	 100, -- cli_score
+	 100  -- srv_score
+      )
+   end
+end
+
+-- #################################################################
+
+return script