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Bug #52260 Windows implementation of dns_get_record fails with non-existing domain
Submitted: 2010-07-06 02:08 UTC Modified: 2010-09-06 12:58 UTC
Votes:2
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: a_jelly_doughnut at phpbb dot com Assigned: pajoye
Status: Assigned Package: Network related
PHP Version: 5.3.2 OS: Windows (All)
Private report: No CVE-ID:
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 [2010-07-06 02:08 UTC] a_jelly_doughnut at phpbb dot com
Description:
------------
Windows implementation of dns_get_record fails with non-existing domain

---
var_dump(dns_get_record('dalfkjdaslfj.net')); // return false, throw E_WARNING
---

This is inconsistent with the *NIX implementation, which never (in our testing, see * note at bottom) throws E_WARNING on a non-existing domain, and returns an empty array, as demonstrated below:

---
afischer@miraculix:~$ php -v
PHP 5.3.2-1ubuntu4.2 with Suhosin-Patch (cli) (built: May 13 2010 20:01:00)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
    with Xdebug v2.0.5, Copyright (c) 2002-2008, by Derick Rethans

afischer@miraculix:~$ php -r "error_reporting(E_ALL); var_dump(dns_get_record('dalfkjdaslfj.net'));"
array(0) {
}
---

There is code in dns_win32.c to attempt to catch some cases of non-existing domains, but it does not seem to be complete.

Changing
---
		if (status) {
				if (status == DNS_INFO_NO_RECORDS) {
					continue;
---
to 
---
			if (status) {
				if (status == DNS_INFO_NO_RECORDS || status == DNS_ERROR_RCODE_NAME_ERROR) {
					continue;

---
Seems to fix the problems for me.  For reference, all error codes which can be returned by DNSQuery_A are listed by Microsoft: http://msdn.microsoft.com/en-us/library/ms681391

* I cannot say for sure if reports like http://bugs.php.net/bug.php?id=50903 are valid.  I do know from reading the PHP source that there are three separate *NIX implementations of php_dns_search(), but Andreas has not investigated which one his Ubuntu server is using.  It seems likely that this inconsistency affects NIX implementations as well.

Test script:
---------------
<?php
var_dump(dns_get_record('dalfkjdaslfj.net')); // return false, throw E_WARNING
?>

Expected result:
----------------
array(0) {
}

Actual result:
--------------
bool(false)

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2010-07-10 16:32 UTC] felipe@php.net
-Status: Open +Status: Assigned -Assigned To: +Assigned To: pajoye
 [2010-09-06 12:57 UTC] pajoye@php.net
Automatic comment from SVN on behalf of pajoye
Revision: http://svn.php.net/viewvc/?view=revision&amp;revision=303069
Log: - fix bug #52260, catch all DNS not found error
 [2010-09-06 12:58 UTC] pajoye@php.net
The not found error has been fixed in svn (5.3/trunk).

However I keep this issue open and assigned to me as I think the DNS function should not be as noisy as they are now (what's the point of raising a warning if all one wants is to actually check a domain...).
 
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