php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #40351 [BOGUS] DNS resolution fails with PHP
Submitted: 2007-02-04 13:34 UTC Modified: 2007-02-05 12:34 UTC
From: dae at datasec dot no Assigned:
Status: Not a bug Package: *Network Functions
PHP Version: 4.4.4 OS: Trustix 3.0.5 RC1
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: dae at datasec dot no
New email:
PHP Version: OS:

 

 [2007-02-04 13:34 UTC] dae at datasec dot no 
Description:
------------
PHP can not do DNS-resolution,
all other software or parts of the OS can.

Reproduce code:
---------------
$foo = gethostbyaddr('69.147.83.197');
echo 'gethostbyaddr [should show a hostname] : '.$foo."\n";

$foo = gethostbyname("php.net");
echo 'gethostbyname [should show an ip] : '.$foo."\n";

$host = explode('@', 'webmaster@php.net');
if(!checkdnsrr($host[1].'.', 'MX') ) {
	echo "No MX record found for webmaster@php.net\n";
}

Expected result:
----------------
gethostbyaddr [should show a hostname] : y2.php.net
gethostbyname [should show an ip] : 69.147.83.197

Actual result:
--------------
gethostbyaddr [should show a hostname] : 69.147.83.197
gethostbyname [should show an ip] : php.net
No MX record found for webmaster@php.net

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2007-02-05 09:26 UTC] tony2001@php.net 
Not enough information was provided for us to be able
to handle this bug. Please re-read the instructions at
http://bugs.php.net/how-to-report.php

If you can provide more information, feel free to add it
to this bug and change the status back to "Open".

Thank you for your interest in PHP.
 [2007-02-05 10:05 UTC] dae at datasec dot no 
Sorry for not providing enough details the first time,
I wanted to be brief, but I was too brief then.
I have re-read the instructions, and if I
still don't provide enough details, 
please specify what more details you need from me.
Thank you.

PHP can not do DNS-resolution,
all other software or parts of the OS can.
Postfix log-sample:
Feb  4 13:18:42 localhost postfix/smtp[8064]: 0EED46BC0D9: to=<xxx@example.com>, relay=mx01.example.com[0.0.0.0], delay=0, status=sent (250 2.0.0 l14CIjgK005386 Message accepted for delivery)

Bash example:
~# telnet php.net 80
Trying 69.147.83.197...
Connected to php.net.

~# nslookup php.net
Server:         213.x.x.x
Address:        213.x.x.x#53

Non-authoritative answer:
Name:   php.net
Address: 69.147.83.197

~# nslookup 69.147.83.197
Server:         213.x.x.x
Address:        213.x.x.x#53

Non-authoritative answer:
197.83.147.69.in-addr.arpa      name = y2.php.net.


Error log example:
[date] [error] PHP Warning:  socket_connect() Host lookup failed [-10002]: Host name lookup failure

PHP compile option:
 './configure' '--enable-memory-limit' '--enable-safe-mode' '--enable-magic-quotes' '--enable-sockets' '--prefix=/usr/local/php_4.4.4' '--with-openssl' '--enable-force-cgi-redirect' '--with-apache=/root/inst/apache_1.3.37' '--with-zlib'
 [2007-02-05 10:19 UTC] tony2001@php.net 
Does PHP CLI work for you?
 [2007-02-05 12:32 UTC] dae at datasec dot no 
Problem solved. This was a bogus bug report,
and I am definately very sorry.

Thank you very much for pointing me to PHP CLI Tony,
it helped me see the problem. I am very grateful for
quick and helpful feedback. 

Only root can run PHP-CLI on my server, so
I finally figured out why php with apache couldn't
do DNS-lookups.

If anybody else experience this problem;
make sure /etc/resolv.conf are chmod 444 (or 644).
And also apache-daemon must be stopped and started
after making changes to resolv.conf.

I feel so stupid, very sorry again.

Keep up your great work with developing PHP,
it is my favorite!
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Fri May 09 17:01:28 2025 UTC