PHP - Validate NS / DNS Server Ip using dns_get_record()












1















I am trying to validate NS / DNS Server Ip provided by user, using dns_get_record().
Code:



$site = 'google.com';
$ns = array('104.28.4.30'); // Some Ip Address not NS / DNS
echo '<pre>';
$result = dns_get_record($site, DNS_A, $ns);
print_r($result);
print_r($ns);


Output:



Array
(
[0] => Array
(
[host] => google.com
[class] => IN
[ttl] => 299
[type] => A
[ip] => 74.125.200.113
)

...

[5] => Array
(
[host] => google.com
[class] => IN
[ttl] => 299
[type] => A
[ip] => 74.125.200.101
)
)
Array
(
)


As I have provide some random Ip but dns_get_record() seems to fetch records somehow regardless the provided Ip is NS / DNS or not.
PS. I am aware of NET_DNS2 class but thought if there is a work around in native PHP.










share|improve this question



























    1















    I am trying to validate NS / DNS Server Ip provided by user, using dns_get_record().
    Code:



    $site = 'google.com';
    $ns = array('104.28.4.30'); // Some Ip Address not NS / DNS
    echo '<pre>';
    $result = dns_get_record($site, DNS_A, $ns);
    print_r($result);
    print_r($ns);


    Output:



    Array
    (
    [0] => Array
    (
    [host] => google.com
    [class] => IN
    [ttl] => 299
    [type] => A
    [ip] => 74.125.200.113
    )

    ...

    [5] => Array
    (
    [host] => google.com
    [class] => IN
    [ttl] => 299
    [type] => A
    [ip] => 74.125.200.101
    )
    )
    Array
    (
    )


    As I have provide some random Ip but dns_get_record() seems to fetch records somehow regardless the provided Ip is NS / DNS or not.
    PS. I am aware of NET_DNS2 class but thought if there is a work around in native PHP.










    share|improve this question

























      1












      1








      1








      I am trying to validate NS / DNS Server Ip provided by user, using dns_get_record().
      Code:



      $site = 'google.com';
      $ns = array('104.28.4.30'); // Some Ip Address not NS / DNS
      echo '<pre>';
      $result = dns_get_record($site, DNS_A, $ns);
      print_r($result);
      print_r($ns);


      Output:



      Array
      (
      [0] => Array
      (
      [host] => google.com
      [class] => IN
      [ttl] => 299
      [type] => A
      [ip] => 74.125.200.113
      )

      ...

      [5] => Array
      (
      [host] => google.com
      [class] => IN
      [ttl] => 299
      [type] => A
      [ip] => 74.125.200.101
      )
      )
      Array
      (
      )


      As I have provide some random Ip but dns_get_record() seems to fetch records somehow regardless the provided Ip is NS / DNS or not.
      PS. I am aware of NET_DNS2 class but thought if there is a work around in native PHP.










      share|improve this question














      I am trying to validate NS / DNS Server Ip provided by user, using dns_get_record().
      Code:



      $site = 'google.com';
      $ns = array('104.28.4.30'); // Some Ip Address not NS / DNS
      echo '<pre>';
      $result = dns_get_record($site, DNS_A, $ns);
      print_r($result);
      print_r($ns);


      Output:



      Array
      (
      [0] => Array
      (
      [host] => google.com
      [class] => IN
      [ttl] => 299
      [type] => A
      [ip] => 74.125.200.113
      )

      ...

      [5] => Array
      (
      [host] => google.com
      [class] => IN
      [ttl] => 299
      [type] => A
      [ip] => 74.125.200.101
      )
      )
      Array
      (
      )


      As I have provide some random Ip but dns_get_record() seems to fetch records somehow regardless the provided Ip is NS / DNS or not.
      PS. I am aware of NET_DNS2 class but thought if there is a work around in native PHP.







      php dns






      share|improve this question













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      asked Nov 22 '18 at 6:22









      Mike DaVinciMike DaVinci

      19219




      19219
























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          The third argument to dns_get_record() is an output parameter, the initial value is ignored. It's filled in by the function with the authoritative servers for the domain.



          However, DNS servers don't always return the list of authoritative servers in their responses, this is a configurable option in most nameservers (including BIND, the most common nameserver). If the server doesn't return anything in the Authority Section of the response, the array will be empty.






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            1 Answer
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            active

            oldest

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            active

            oldest

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            active

            oldest

            votes









            1














            The third argument to dns_get_record() is an output parameter, the initial value is ignored. It's filled in by the function with the authoritative servers for the domain.



            However, DNS servers don't always return the list of authoritative servers in their responses, this is a configurable option in most nameservers (including BIND, the most common nameserver). If the server doesn't return anything in the Authority Section of the response, the array will be empty.






            share|improve this answer




























              1














              The third argument to dns_get_record() is an output parameter, the initial value is ignored. It's filled in by the function with the authoritative servers for the domain.



              However, DNS servers don't always return the list of authoritative servers in their responses, this is a configurable option in most nameservers (including BIND, the most common nameserver). If the server doesn't return anything in the Authority Section of the response, the array will be empty.






              share|improve this answer


























                1












                1








                1







                The third argument to dns_get_record() is an output parameter, the initial value is ignored. It's filled in by the function with the authoritative servers for the domain.



                However, DNS servers don't always return the list of authoritative servers in their responses, this is a configurable option in most nameservers (including BIND, the most common nameserver). If the server doesn't return anything in the Authority Section of the response, the array will be empty.






                share|improve this answer













                The third argument to dns_get_record() is an output parameter, the initial value is ignored. It's filled in by the function with the authoritative servers for the domain.



                However, DNS servers don't always return the list of authoritative servers in their responses, this is a configurable option in most nameservers (including BIND, the most common nameserver). If the server doesn't return anything in the Authority Section of the response, the array will be empty.







                share|improve this answer












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                answered Nov 22 '18 at 6:29









                BarmarBarmar

                421k35245346




                421k35245346






























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