Description:
------------
(the error also occurs in PHP5.0.5)

dns_get_record() results in strange behaviour when supplied with long hostnames, e.g.:

$ host -t mx 0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk
0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk      MX     10 mail.0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk

.. but:

$ php -v
PHP 5.0.5-1.dotdeb.1 (cli) (built: Sep  7 2005 10:07:31)
Copyright (c) 1997-2004 The PHP Group
Zend Engine v2.0.5, Copyright (c) 1998-2004 Zend Technologies

$ php -r 'var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));'
array(0) {
}

$ ~/dev/php-5.1.0RC3/sapi/cli/php -v
PHP 5.1.0RC3 (cli) (built: Oct 21 2005 04:40:34)
Copyright (c) 1997-2005 The PHP Group
Zend Engine v2.1.0-dev, Copyright (c) 1998-2005 Zend Technologies

$ ~/dev/php-5.1.0RC3/sapi/cli/php -r 'var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));'
array(0) {
}

(yes, the domain name is valid and has a MX entry)

Furthermore, strange results arrive when dns_get_record() is called with long hostnames several times after a succesful lookup (for at shorter hostname). According to var_dump(), dns_get_record() loops between returning an array with an int, a recursive array and NULL.

The error is not restricted to DNS_MX - same result will show up for e.g. DNS_A and DNS_NS requests.

Before suspecting the output of dns_get_record() I was baffled when php actually segfaulted when beginning a foreach()-loop with the return value of dns_get_record(). I suppose it happened when foreach() was supplied with a recursion.


Reproduce code:
---------------
<?php
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
var_dump(dns_get_record("php.net",DNS_MX));
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
var_dump(dns_get_record("0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk",DNS_MX));
?>


Expected result:
----------------
array(1) {
  [0]=>
  array(6) {
    ["host"]=>
    string(7) "0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk"
    ["type"]=>
    string(2) "MX"
    ["pri"]=>
    int(10)
    ["target"]=>
    string(12) "mail.0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0o0.dk"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(127779)
  }
}

(a couple of times)

Actual result:
--------------
array(0) {
}
array(0) {
}
array(2) {
  [0]=>
  array(6) {
    ["host"]=>
    string(7) "php.net"
    ["type"]=>
    string(2) "MX"
    ["pri"]=>
    int(5)
    ["target"]=>
    string(12) "osu1.php.net"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(63337)
  }
  [1]=>
  array(6) {
    ["host"]=>
    string(7) "php.net"
    ["type"]=>
    string(2) "MX"
    ["pri"]=>
    int(15)
    ["target"]=>
    string(15) "smtp.osuosl.org"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(63337)
  }
}
array(1) {
  [0]=>
  int(16384)
}
array(1) {
  [0]=>
  array(1) {
    [0]=>
    *RECURSION*
  }
}
array(1) {
  [0]=>
  NULL
}
array(1) {
  [0]=>
  int(16384)
}
array(1) {
  [0]=>
  array(1) {
    [0]=>
    *RECURSION*
  }
}
array(1) {
  [0]=>
  NULL
}