snmp-scan filter for dns resolved devices (#14934)

* snmp-scan filter for dns resolved devices

* .

* add console arguments

routes/console.php

@@ -177,6 +177,7 @@ Artisan::command('poller:billing-calculate
 Artisan::command('scan
     {network?* : ' . __('CIDR notation network(s) to scan, can be ommited if \'nets\' config is set') . '}
     {--P|ping-only : ' . __('Add the device as a ping only device if it replies to ping but not SNMP') . '}
+    {--o|dns-only : ' . __('Only DNS resolved Devices') . '}
     {--t|threads=32 : ' . __('How many IPs to scan at a time, more will increase the scan speed, but could overload your system') . '}
     {--l|legend : ' . __('Print the legend') . '}
 ', function () {
@@ -189,6 +190,10 @@ Artisan::command('scan
         return 1;
     }
 
+    if ($this->option('dns-only')) {
+        $command[] = '-o';
+    }
+
     if ($this->option('ping-only')) {
         $command[] = '-P';
     }

snmp-scan.py

@@ -43,6 +43,7 @@ class Outcome:
     FAILED = 4
     EXCLUDED = 5
     TERMINATED = 6
+    NODNS = 7
 
 
 POLLER_GROUP = "0"
@@ -59,6 +60,7 @@ stats = {
     Outcome.FAILED: 0,
     Outcome.EXCLUDED: 0,
     Outcome.TERMINATED: 0,
+    Outcome.NODNS: 0,
 }
 
 
@@ -75,6 +77,7 @@ def get_outcome_symbol(outcome):
         Outcome.KNOWN: "*",
         Outcome.FAILED: "-",
         Outcome.TERMINATED: "",
+        Outcome.NODNS: "",
     }[outcome]
 
 
@@ -126,6 +129,9 @@ def scan_host(scan_ip):
 
         try:
 
+            if args.dns and not hostname:
+                return Result(scan_ip, hostname, Outcome.NODNS, "DNS not Resolved")
+
             arguments = [
                 "/usr/bin/env",
                 "lnms",
@@ -134,9 +140,11 @@ def scan_host(scan_ip):
                 POLLER_GROUP,
                 hostname or scan_ip,
             ]
+
             if args.ping:
                 arguments.insert(5, args.ping)
             add_output = check_output(arguments)
+
             return Result(scan_ip, hostname, Outcome.ADDED, add_output)
         except CalledProcessError as err:
             output = err.output.decode().rstrip()
@@ -188,6 +196,15 @@ Example: 192.168.0.1/32 will be treated as a single host address""",
             POLLER_GROUP
         ),
     )
+
+    parser.add_argument(
+        "-o",
+        "--dns-only",
+        dest="dns",
+        action="store_true",
+        help="Only DNS resolved Devices",
+    )
+
     parser.add_argument("-l", "--legend", action="store_true", help="Print the legend.")
     parser.add_argument(
         "-v",