[PATCH] libads: Fix fallback logic when finding a domain controller

[Uri Simchoni]

Oops once again with the patch...

On Tue, Jun 9, 2015 at 10:18 PM, Uri Simchoni <urisimchoni at gmail.com> wrote:
> This is a patch to fix bug 11321.
>
> Basically when finding a domain controller, the method is to resolve
> the IP address of candidate servers, and then do an ldap ping until a
> suitable server answers.
>
> In case of failure, there's fallback from DNS lookup to netbios lookup
> (if netbios is enabled) and then back to site-less DNS lookup. The two
> problems here are:
> 1. It makes more sense to try site-less DNS before NetBIOS because the
> fallback to NetBIOS is not likely to give better results.
> 2. The NetBIOS fallback screws the site-less fallback (I suppose the
> "goto considered harmful fellows are sometimes right after all...).
>
> This fix extracts the core code that does name resolving+ldap ping
> into a separate function and then activates this function in up to
> three modes - site-aware, site-less, and netbios, in that order.
>
> Thanks,
> Uri.
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