getaddrinfo()-related replication problem on FreeBSD

[Timur I. Bakeyev]

Hi, Andrew, Adriy!

This topic was brought to my attention as FreeBSD's Samba port maintainer
and I dug deeper into it.

Well, it's true that resolver on FreeBSD doesn't understand names, starting
with '_', but neither does resolver on Linux!

On IRC we tested small program that tries to resolve '_msdcs.samba.org.ru'
IN A record with getaddrinfo() and it fails on Debian6, SusE and CentOS as
well.

BTW, rep_getaddrinfo() isn't better in that sense either - it relies on
platform's gethostbyname() function, so will fail too.

Well, maybe, there is a platform that allows that(besides M$ Windows),
but definitely not even a majority of Linuxes.

So, now I'm wondering, where the original idea that such name resolution
has to be supported by getaddrinfo() comes from
and if replication works on Linux despite strict RFC compliance of
getaddrinfo() - what ACTUALLY wrong with replication on FreeBSD?

And, what additional measures do we need to take to make it work?

For the test feel free to try:

# ping _msdcs.samba.org.ru
# host _msdcs.samba.org.ru


With best regards,
Timur Bakeyev.



On Thu, Oct 4, 2012 at 11:36 AM, Andriy Syrovenko <andriys at gmail.com> wrote:

> Hi Andrew,
>
> If this is the same patch you've sent previously, then no, it does not
> work- it segfaults.
>
> And, by the way, since you've added some magic to replicate DNS partitions
> during DC join, replication does not work on FreeBSD any more at all. I'll
> try to find some time and post some more details later.
>
> BR,
> Andrey.
>
> Best regards,
> Andrey.
>
> 2012/10/4 Andrew Bartlett <abartlet at samba.org>
>
> > Otherwise, if we can at least confirm this patch works, and perhaps if
> > you would like to return it with a tested #ifdef FreeBSD wrapper I could
> > include it.
> >
>