Re-enabled ip/mac reassignment alert (#6825)

scripts/lua/modules/check_definitions/network/ip_reassignment.lua

@@ -0,0 +1,75 @@
+--
+-- (C) 2019-21 - ntop.org
+--
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+local checks = require("checks")
+
+-- #################################################################
+
+local function dummy()
+   -- Nothing to do here, the plugin is only meant to set a preference which is then
+   -- read from C.
+   return
+end
+
+-- #################################################################
+
+local script = {
+   -- Script category
+   category = checks.check_categories.network,
+
+   -- Off by default
+   default_enabled = false,
+
+   -- NOTE: hooks defined below
+   hooks = {
+      min = dummy
+   },
+
+   gui = {
+      i18n_title = "alerts_dashboard.mac_ip_association_change",
+      i18n_description = "alerts_dashboard.mac_ip_association_change_descr",
+   }
+}
+
+-- #################################################################
+
+local function update_ip_reassignment(enabled)
+   -- For each interface, get its pool configuration, and check whether this script is enabled or not
+   for ifid, _ in pairs(interface.getIfNames()) do
+      -- Set the in-memory pref for the interface
+      interface.updateIPReassignment(tonumber(ifid), enabled == true)
+   end
+
+   return true
+end
+
+-- #################################################################
+
+function script.onLoad(hook, hook_config)
+   update_ip_reassignment(hook_config and hook_config.enabled)
+end
+
+-- #################################################################
+
+function script.onUnload(hook, hook_config)
+   update_ip_reassignment(hook_config and hook_config.enabled)
+end
+
+-- #################################################################
+
+function script.onEnable(hook, hook_config)
+   update_ip_reassignment(hook_config and hook_config.enabled)
+end
+
+-- #################################################################
+
+function script.onDisable(hook, hook_config)
+   update_ip_reassignment(hook_config and hook_config.enabled)
+end
+
+-- #################################################################
+
+return script