dns_get_record(): A temporary server error occurred.

Question

I'm querying a whole bunch of addresses, some are online and some are not. I can't seem to get around this error however, even catching the exception fails :(

 dns_get_record(): A temporary server error occurred. 


        try {
            $result = dns_get_record('_minecraft._tcp.' . $addr, DNS_SRV);
        }
        catch (Exception $e) {
            return [$addr,$port];
        }

If this error occurs, I want to continue the script, skipping the record, however currently the script just halts.

Any help appreciated!!

Define `catching the exception fails`, does it even throw an exception? Unless it throws an exception or fatal error the script shouldn't halt. — Charlotte Dunois, Mar 29 '16 at 10:09
I get a 500 error that returns: dns_get_record(): A temporary server error occurred. — Josh Undefined, Mar 29 '16 at 10:23
Sorry, I get 200 OK with ErrorException (E_UNKNOWN) dns_get_record(): A temporary server error occurred. — Josh Undefined, Mar 29 '16 at 10:30
Then you're catching the wrong exception. You need to catch `ErrorException`. — Charlotte Dunois, Mar 29 '16 at 10:32
@JoshUndefined The reason you can't catch this "Exception" is because it isn't an exception, it's a warning. See http://stackoverflow.com/questions/1241728/can-i-try-catch-a-warning for more details. — Andrew Breksa, Oct 14 '16 at 19:22

score 17 · Accepted Answer · edited Jun 06 '17 at 16:43

17

I can't catch this exception too. And how I understood it's a bug of php: https://bugs.php.net/bug.php?id=73149

But I found another solution. You can use @ when you call this function. This symbol kill all errors when you call this one. And it will looks like that:

$dns = @dns_get_record($domain, DNS_A);
if(!$dns){
    return false;
}

edited Jun 06 '17 at 16:43

answered Jun 06 '17 at 16:26

SlovyanskiyYehor

456
3
9

1

It looks like this is the workaround for this PHP bug. While we ended up using an external DNS API (yes i know...) for this issue I'll mark this as the answer for anyone finding this question. Thanks!! – Josh Undefined Jun 07 '17 at 12:37
Longer description why https://dustri.org/b/a-short-tale-on-phps-dns_get_record.html – michalzuber Mar 02 '20 at 08:57

score 0 · Answer 2 · answered Dec 20 '22 at 04:29

0

I was able to get the IP (A record) for a host using the below PHP function

gethostbynamel(string $hostname): array|false

Reference: gethostbynamel — Get a list of IPv4 addresses corresponding to a given Internet host name

answered Dec 20 '22 at 04:29

Senthil

171
4

score -6 · Answer 3 · answered Oct 20 '16 at 17:39

try this:

     try {
         $dns = dns_get_record($domain, DNS_A);
     }
     catch (Exception $e) {
         if ($e->getMessage() !== 'dns_get_record(): A temporary server error     occurred.') {
             throw $e;
         }
         $dns = false;
     }

dns_get_record(): A temporary server error occurred.

3 Answers3