Bug #66877 [Opn]: Invalid return value checkdnsrr / getmxrr

From: Date: Wed, 10 Jun 2015 12:55:13 +0000
Subject: Bug #66877 [Opn]: Invalid return value checkdnsrr / getmxrr
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-193304@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=66877&edit=1

 ID:                 66877
 Updated by:         cmb@php.net
 Reported by:        nschoenmaker at hostnet dot nl
 Summary:            Invalid return value checkdnsrr / getmxrr
 Status:             Open
 Type:               Bug
 Package:            URL related
 Operating System:   Ubuntu 13.10
 PHP Version:        5.5.10
 Block user comment: N
 Private report:     N

 New Comment:

I can't reproduce this issue, see <http://3v4l.org/P0nsE>.

Interestingly, on Windows 7 (PHP 5.5.25 and 5.6.9) I get:

    bool(false)
    bool(false)
    NULL
    
That is, however, another (albeit minor) issue, and should be
handled in a separate ticket.

However, a user contributed note[1] claims even stranger behavior,
which I couldn't reproduce either: <http://3v4l.org/Tf5sT>.

[1] <http://php.net/manual/en/function.getmxrr.php#103123>


Previous Comments:
------------------------------------------------------------------------
[2014-03-10 11:41:02] nschoenmaker at hostnet dot nl

The return value is incorrect, not the return type.

------------------------------------------------------------------------
[2014-03-10 11:35:32] nschoenmaker at hostnet dot nl

Description:
------------
The return type of checkdnsrr and getmxrr are described as: Returns TRUE if any records are found;
returns FALSE if no records were found or if an error occurred.

So if we check for a non-existant domain name, the result should be false.

The following command gives the expected result on my system, empty:
dig +short non-existant-domain-name.com MX

Bug found using Zend server 6.3, which is released with PHP 5.5.7. Also confirmed for current
master.

Related to (closed) bug https://bugs.php.net/bug.php?id=8264

Test script:
---------------
Two test scripts:

php -r 'var_dump(checkdnsrr("non-existant-domain-name.com"));'
  bool(true)

php -r
'var_dump(getmxrr("non-existant-domain-name.com",$mxhosts));var_dump($mxhosts);'
  bool(true)
  array(0) {
  }


Expected result:
----------------
I would expect checkdnsrr("non-existant-domain-name.com") and
getmxrr("non-existant-domain-name.com",$a) to return false.

Actual result:
--------------
They return true.

The case of getmxrr() is even stranger, this is the description of the meaning of the second
parameter:
    A list of the MX records found is placed into the array mxhosts.

This list is empty! So the return type indicates there are records, but the second in/out argument
indicates there are no records...


------------------------------------------------------------------------



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