[VS] Add IPv4 Network Scan. (#8062)

scripts/lua/modules/vulnerability_scan/modules/ipv4_netscan.lua

@@ -0,0 +1,58 @@
+--
+-- (C) 2020-23 - ntop.org
+--
+
+local vs_module = {}
+
+package.path = dirs.installdir .. "/scripts/lua/modules/vulnerability_scan/?.lua;" .. package.path
+local vs_utils = require("vs_utils")
+
+-- ##############################################
+
+function vs_module:new()
+   local obj = { name = "ipv4_netscan", cidr = 24 }
+
+   setmetatable(obj, self)
+   self.__index = self
+
+   return obj
+end
+
+-- ##############################################
+
+function vs_module:is_enabled()
+   return(vs_utils.is_nmap_installed())
+end
+
+-- ##############################################
+
+-- NOTE: ports are comma separated (e.g 80,443)
+
+function vs_module:scan_host(network_ip, ports, use_coroutines)
+   local secondary_scan_type, scan_frequency = vs_utils.get_network_pref_value(network_ip, self.name)
+
+   local discovered_hosts,scan_out,start_scan,scan_duration,scan_ok = vs_utils.exec_netscan(network_ip, self.cidr)
+
+   for _,host_ip in ipairs(discovered_hosts) do
+      if (vs_utils.isVSConfiguredHost(host_ip)) then
+         ------- host aleady configured case -------
+      else
+         ------- new host not found case -------
+
+         -- trigger alert host not configured
+         vs_utils.triggerHostNotConfiguredAlert(host_ip)
+         
+         -- add and scan new host
+         local result,id = vs_utils.add_host_pref(secondary_scan_type, host_ip, ports, scan_frequency, nil)
+         vs_utils.schedule_ondemand_single_host_scan(secondary_scan_type,host_ip,ports,id,false,false,false)
+      end
+   end
+   
+   return start_scan,scan_out,scan_duration,scan_ok,0--[[num_open_ports]],0--[[num_vulnerabilities_found]],{}--[[cve]],{}--[[udp_ports]],{}--[[tcp_ports]]
+
+end
+
+-- ##############################################
+
+return vs_module
+