Add VS verbosity and redis variable to enable debugging

scripts/lua/modules/vulnerability_scan/vs_utils.lua

@@ -64,7 +64,11 @@ local format_utils = require("format_utils")
 local recipients = require("recipients")
 local cve_utils = require("cve_utils")
 
-local debug_me = false
+-- Enable debug with:
+-- redis-cli set "ntopng.prefs.vs.debug_enabled" "1"
+-- systemctl restart ntopng
+local debug_me = ntop.getCache("ntopng.prefs.vs.debug_enabled") == "1"
+local verbose = true
 
 local vs_utils = {}
 
@@ -1108,7 +1112,7 @@ function vs_utils.notify_scan_results(is_periodic, periodicity)
                  end_date = end_date_formatted
       })
    else
-      -- scan all case
+      -- on demand scan
       notification_message = i18n("hosts_stats.page_scan_hosts.email.scan_all_ended", {
 				     cves = format_num_for_email(cve_num,0),
 				     udp_ports = format_num_for_email(udp_ports,1),
@@ -1122,6 +1126,10 @@ function vs_utils.notify_scan_results(is_periodic, periodicity)
       })
    end
 
+   if verbose then
+      traceError(TRACE_NORMAL,TRACE_CONSOLE, "Vulnerability Scan completed. Sending " .. title .."\n")
+   end
+
    recipients.sendMessageByNotificationType({periodicity = periodicity, success=true, message = notification_message, title = title}, "vulnerability_scans")
 
    ntop.setCache(info_redis_key,json.encode({
@@ -1129,7 +1137,7 @@ function vs_utils.notify_scan_results(is_periodic, periodicity)
 		       udp_ports = 0,
 		       tcp_ports = 0,
 		       begin_epoch = 0,
-             scanned_hosts = 0
+		       scanned_hosts = 0
    }))
 end
 
@@ -1586,6 +1594,7 @@ function vs_utils.schedule_periodic_scan(periodicity)
    local host_to_scan_list = vs_utils.retrieve_hosts_to_scan()
 
    if (#host_to_scan_list > 0 ) then
+
       local is_already_running = ntop.getCache(periodic_scan_key) == "1"
       if not is_already_running then
 
@@ -1593,7 +1602,6 @@ function vs_utils.schedule_periodic_scan(periodicity)
 
 	 for _,scan_info in ipairs(host_to_scan_list) do
 	    local frequency = scan_info.scan_frequency
-
 	    if(frequency == periodicity) then
 	       vs_utils.schedule_ondemand_single_host_scan(scan_info.scan_type, scan_info.host, scan_info.ports, scan_info.id, true, false)
 	       is_scanning_almost_one = true