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Bug #38195 getmxrr broken in 5.1.4; worked in PHP 4.x
Submitted: 2006-07-24 16:36 UTC Modified: 2006-07-25 12:30 UTC
From: sam at ims dot net Assigned:
Status: Not a bug Package: *Network Functions
PHP Version: 5.1.4 OS: Fedora Core 4
Private report: No CVE-ID: None
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 [2006-07-24 16:36 UTC] sam at ims dot net 
Description:
------------
After upgrading from PHP 4.4.1 to PHP 5.1.4, the getmxrr function ceased to work.  It does not throw an error message, but simply terminates the HTTP response at the call.  I've switched to checkdnsrr, which works fine, and is probably a more appropriate call, but since getmxrr is still in the documentation for version 5, this appears to be a bug.

Reproduce code:
---------------
if (getmxrr($host, $email)) return TRUE;

Expected result:
----------------
TRUE returned if $email corresponds to a domain with an MX record; FALSE otherwise.

Actual result:
--------------
Termination of HTTP response.  Neither TRUE nor FALSE returned.  Nothing appears in the Apache error log.

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 [2006-07-24 17:02 UTC] tony2001@php.net 
Works perfectly fine here:

# php -r 'var_dump(getmxrr("yahoo.com", $var)); var_dump($var);'
bool(true)
array(4) {
  [0]=>
  string(18) "mx3.mail.yahoo.com"
  [1]=>
  string(18) "mx4.mail.yahoo.com"
  [2]=>
  string(18) "mx1.mail.yahoo.com"
  [3]=>
  string(18) "mx2.mail.yahoo.com"
}
 [2006-07-24 18:12 UTC] sam at ims dot net 
Doesn't work here (FC 4 machine), but checkdnsrr does:

sam@snoopy:~> php -r 'var_dump(getmxrr("yahoo.com", $var)); var_dump($var);'
sam@snoopy:~>
sam@snoopy:~> php -r 'var_dump(checkdnsrr("yahoo.com"));'
bool(true)
sam@snoopy:~> uname -a
Linux snoopy 2.6.15-1.1830_FC4smp #1 SMP Thu Feb 2 17:39:38 EST 2006 i686 i686 i386 GNU/Linux
s

All works here (FC 5 machine):

sam@lassie:~> php -r 'var_dump(getmxrr("yahoo.com", $var)); var_dump($var);'
bool(true)
array(4) {
  [0]=>
  string(18) "mx2.mail.yahoo.com"
  [1]=>
  string(18) "mx3.mail.yahoo.com"
  [2]=>
  string(18) "mx4.mail.yahoo.com"
  [3]=>
  string(18) "mx1.mail.yahoo.com"
}
sam@lassie:~> uname -a
Linux lassie 2.6.17-1.2157_FC5 #1 Tue Jul 11 22:55:46 EDT 2006 i686 athlon i386 GNU/Linux
sam@lassie:~>
 [2006-07-25 06:58 UTC] tony2001@php.net 
Obviously something is wrong on your FC4 machine and nobody except you can find out what exactly is broken there.
 [2006-07-25 12:30 UTC] sam at ims dot net 
Yeah, I guess you're right - even though getmxrr worked perfectly fine just before I compiled and upgraded PHP 5.1.4.  Must be a problem with my machine that PHP 5.1.4 exposed.  I guess that's not a bug, although it certainly cost me in web app failure until I found out that it was a PHP call that had worked on that server fine for 5 years and suddenly was broken with a new PHP version.  But, ya know, I think I'll tell my clients that were very upset about it that it's a PHP bug, anyway, because I sure didn't change anything else on the server!
 
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