FreeTDS Development Group

[Peter Deacon <peterd AT iea-software.com>]

On Wed, 27 Apr 2016, Frediano Ziglio wrote:

> The commit that introduced the flag is
> https://github.com/FreeTDS/freetds/commit/25edb8ef.

> I don't remember exactly but I don't remember all the problems. I
> think that without the flag some environment can send multiple queries
> and you increase the connection timeout in environment where the DNS
> do not return AAAA records. Unfortunately these environments were
> quite common :-(
> I don't know... possible todos/solutions:
> - look at the old ML thread(s) and try to understand why this flag was
> used (if I remember there were multiple threads);
> - add a freetds.conf option;
> - if getaddrinfo returns EAI_NONAME try without the flag. This would
> slow down connections only if users really used a wrong host name,
> should not that common.

Hi Frediano,

Thanks, think I will just patch this locally.  Using a very old 
environment (compatibility) that seems to be causing this behavior. 
After giving it more thought unlikely anyone would benefit from attempting 
to workaround what is now ancient history.

I also misread getaddrinfo documentation about when default settings 
apply.  ai_flags = 0 would turn off AI_ADDRCONFIG across the board which I 
wouldn't want.

~Peter