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

Edit report at https://bugs.php.net/bug.php?id=66877&edit=1 ID: 66877 Updated by: nikic@php.net Reported by: nschoenmaker at hostnet dot nl Summary: Invalid return value checkdnsrr / getmxrr -Status: Open +Status: Closed Type: Bug Package: URL related Operating System: Ubuntu 13.10 PHP Version: 5.5.10 -Assigned To: +Assigned To: nikic Block user comment: N Private report: N New Comment: I expect that this issue has been resolved by the fixes for bug #78008 and bug #79944. Those are for Alpine, but the basic issue can occur on other OSes depending on the used DNS resolution library. Previous Comments: ------------------------------------------------------------------------ [2015-06-10 12:55:12] cmb@php.net 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> ------------------------------------------------------------------------ [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... ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=66877&edit=1