[PATCH gnupg] dirmngr: Interrogate LDAP server when base DN specified

[NIIBE Yutaka]

Joey Berkovitz wrote:
> Patch attached, related to https://dev.gnupg.org/T6047

I tried to apply your patch, but I found questionable parts in your
patch.  So, to proceed, firstly, I pushed a change of factoring to
interrogate_ldap_dn function (993820c31521).

Questionable parts for me are:

* ldap_count_entries is a function name.  I don't understand "if"
  statement evaluating ldap_count_entries.

* IIUC, with user specified base DN, it may introduce a memory leak for
  basedn.

Fixing those things, I think that changes needed will be something like
the patch attached.

Could you test if it works well?
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