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To: Sanford Whiteman <figureonecpr@gmail.com>, 
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Subject: Re: [PHP-DEV] [RFC] Change checkdnsrr() $type argument behavior
From: mike@php.net (Michael Wallner)

On 2014-09-23 10:11, Sanford Whiteman wrote:
>> if somehost.example.com has the MX, it should return true with
>> checkdnsrr('somehost.example.com'). If example has the MX set to
>> somehost.example.com or similar, it should return true as well. Or am
>> I missing your point?
> 
> You are missing it, as there are no MX records involved.  I'm
> demonstrating that the function gives incorrect results in the absence
> of an MX record because there is a bug in CNAME handling (or a bug in
> A handling, if you prefer).
> 
> somehost.example.com has no MX RR.  It has a CNAME (per DNS rules, the
> CNAME must thus be the only record for somehost.example.com). The
> CNAME  points to example.com.
> 
> example.com has no MX RR.  It has an A pointing to 1.2.3.4.
> 
> checkdnsrr('somehost.example.com') should return false. It returns true.
> checkdnsrr('example.com') should return false.  It returns false.
> 
> You could try to revise the docs and say, "Oh, it doesn't really mean
> an MX lookup, it means an explicit MX *or* implicit MX, like how a
> basic smtp-sender works. So that's why the CNAME --> A one returns
> true."  Except then 'example.com' should return true as well.  It does
> not: it returns false.  Changing the docs does not fix the bug.

Ah okay, I think you're right. It shouldn't accept the CNAME.


-- 
Regards,
Mike