[Psi-devel] IPv6 Support in Psi

[Loren M. Lang]

Justin Karneges wrote:
> On Thursday 12 April 2007 11:02 am, Loren M. Lang wrote:
>> Does that define I uncommented simply switch between QDns and NDns? And,
>> if so, are there any known limitations between the code paths, currently?
> 
> NO_NDNS enables QDns (Q3Dns) for A/AAAA lookups.  QDns is unmaintained, and 
> has a history of being buggy, and so we try to minimize its usage.  This is 
> why the default behavior is to use QDns just for SRV (because we had no other 
> option) and NDns for A records.  For AAAA records, we made a special option 
> (NO_NDNS) to enable usage of QDns in that case, since NDns cannot do AAAA.
> 

NDns is just using gethostbyname() correct?  I believe the correct fix 
is to modify it to use getaddrinfo() instead.  getaddrinfo() appears to 
be able to resolve SRV records in addition to AAAA records.  I can start 
work on a patch to use getaddrinfo instead of gethostbyname()/QDns.

> Note that just because QDns might work fine with SRV does not mean it will 
> work fine for A/AAAA.  As noted in the message Norman dug out from 2004, QDns 
> has/had a grave bug where enabling AAAA would break resolving entirely.  This 
> is why we never enabled NO_NDNS by default.
> 
> -Justin
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> 


-- 
Loren M. Lang
lorenl at north-winds.org
http://www.north-winds.org/


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