ws2_32: Update WS_get_local_ips to not return a bogus IP address.

[Bruno Jesus]

On Thu, Nov 26, 2015 at 6:02 AM, Joachim Priesner
<joachim.priesner at web.de> wrote:
> Am Mittwoch, 25. November 2015 schrieb Jamie Taylor:
>> Interesting.  Does GetAdaptersInfo return a non-null PIP_ADAPTER_INFO when
>> there are no adapters on the (virtual) machine?  How about GetIpAddrTable?
>
> GetAdaptersInfo fails with ERROR_NO_DATA in this case. GetIpAddrTable returns the loopback IP address.
>
>> Does the list of addresses returned by gethostbyname(gethostname()) include
>> the loopback address when there _are_ other adapters configured with IPv4
>> addresses?
>
> No. (However, if there is a loopback adapter added manually, its address is returned, just like with all other adapters.)
>
>> (And if there are multiple loopback adapters installed/configured
>> then are all of their addresses included?)
>
> Yes.
>
> Full test results in a Windows 8.1 VMware VM are here: http://pastebin.com/EjD5rec1

Thanks for the test, what is a manually added loopback adapter? Is
there any use for it?

I'm working on a patch that seems to replicate all current known tests
and probably will get rid of the magic loopback address (127.12.34.56)
unless someone can really explain why it exists.