perl: Net::DNS requires Win32::IPHelper

[Reini Urban]

2010/8/23 Yaakov (Cygwin/X) <yselkowitz@users.sourceforge.net>:
> On Mon, 2010-08-23 at 16:07 +0200, Corinna Vinschen wrote:
>> Here's a question:
>>
>> Why does the Net::DNS module, which provides only a resolver API, depend
>> on a Win32-related package at all?  Cygwin 1.7 provides a BSD compatible
>> resolver API (res_init, res_query, etc) which should be used, just like
>> on Linux.  Does the module erroneously treat Cygwin as Windows target?
>> If so, that should be fixed.
>
> Net::DNS does not bind libresolv on *NIX; it does its own parsing
> of /etc/resolv.conf.  On Win32, it uses Win32::IPHelper's bindings of
> GetNetworkParams.
>
> So this is YA resolver implementation.  When it came to BIND's liblwres,
> you asked that it use the Windows APIs in order to ore closely match our
> libresolv implementation and not require an /etc/resolv.conf.  The same
> would apply here as well.

The real problem is that there exists a native cygwin resolver module
Net::DNS::Resolver::Cygwin, which is just not used.
It does not need Win32::IPHelper and Win32::API, it just reads the relevant
/proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Tcpip/Parameters/
registry entries.

Attached is my tested version, but I want to test it once more with
ipv6 at home.
-- 
Reini Urban
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