Edit report at http://bugs.php.net/bug.php?id=53025&edit=1

 ID:                 53025
 Updated by:         paj...@php.net
 Reported by:        uni at daniel-marschall dot de
 Summary:            checkdnsrr() result vary for specific server
-Status:             Open
+Status:             Feedback
 Type:               Bug
 Package:            Unknown/Other Function
 Operating System:   Various
 PHP Version:        Irrelevant
 Block user comment: N

 New Comment:

Which operating system are you using exactly? Windows (which version?)
Or linux?



Windows has a different DNS implementation than unix.



Also different results may be due to the use of different DNS servers.
Be sure to check that every client uses the same.



On windows you don't have to install PHP to test a new version but
simply uncompress the zip somewhere and run:



php -n dns.php



from the php directory.


Previous Comments:
------------------------------------------------------------------------
[2010-10-09 00:46:39] uni at daniel-marschall dot de

I have tried it now with PHP 5.3.3 at my Windows XP machine. Same
result. A-record 

found. I expect that no A-record for this hostname is found.



Alas, I cannot change the PHP versions for the 2 webservers.

------------------------------------------------------------------------
[2010-10-08 17:20:18] dominic at sayers dot cc

Daniel - check http://bugs.php.net/bug.php?id=51844



I see you're using a mixture of PHP 5.2 and 5.3 - is this a new bug in
5.3 

perhaps?

------------------------------------------------------------------------
[2010-10-08 16:20:39] uni at daniel-marschall dot de

Description:
------------
I am trying to find out if a webserver has A-records or not. I found out
that for the server "us.ibm.com" the results vary from client to client.
Since I am writing an OpenSource application, I wish that the results of
checkdnsrr() are consistent. I am not sure if it is a bug in PHP.

Test script:
---------------
<?php



$phpver = phpversion();

echo "PHP version: $phpver<br>\r\n";

echo $_SERVER["SERVER_SIGNATURE"] . "<br>\r\n";



$server = 'us.ibm.com';



if (checkdnsrr($server, 'A')) {

        echo "$server A-record: VALID";

} else {

        echo "$server A-record: NOT VALID";

}



?>



Expected result:
----------------
I do not know which result is correct. I checked the A-record at many
different webservices and each webservice has different results.



Example:



* MX Toolbox: http://mxtoolbox.com/SuperTool.aspx?action=a%3aus.ibm.com
(NO A-RECORD)



* My-Addr.com:
http://my-addr.com/domain-hostname-dns-records/isp-country-geo-ip-location/online-nslookup-tool/domain_info.php?domain=us.ibm.com&x=0&y=0
(A-RECORDS e32.co.us.ibm.com FOUND, but therefore no IP, so data MAY be
incorrect)



* OpenDNS also outputs some A-records for that domain, but I am not sure
if they are valid



* ntchosting.com:
http://www.ntchosting.com/dns/host.html#Check_the_A_record - Various
A-record FOUND! (e.g. e1.ny.us.ibm.com )



Actual result:
--------------
Some PHP clients output "A record found", others output "No A record
found". I do not know if it is controlled by the OS, the network or the
PHP version.



Examples for data I collected:



1. Tested at my Debian server (viathinksoft.de) and A-record FOUND.
Software: Apache/2.2.9 (Debian) DAV/2 SVN/1.5.1 PHP/5.2.6-1+lenny8 with
Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g mod_perl/2.0.4 Perl/v5.10.0



2. Tested at my XAMPP localhost with Windows XP Home and A-record FOUND.
Software: Windows XP Home; XAMPP; Apache/2.2.14 (Win32) DAV/2
mod_ssl/2.2.14 OpenSSL/0.9.8l mod_autoindex_color PHP/5.3.1
mod_apreq2-20090110/2.7.1 mod_perl/2.0.4 Perl/v5.10.1



3. Tested at my university's server (jonathan.sv.hs-mannheim.de) and
A-record NOT found. Software: Apache/2.2.8 (Fedora). PHP version:
5.2.6.




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



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