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Message-ID: <20200731191917.GU6949@brightrain.aerifal.cx>
Date: Fri, 31 Jul 2020 15:19:17 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: getaddrinfo(3) with AI_V4MAPPED and AI_ALL flags
On Fri, Jul 31, 2020 at 07:21:47PM +0300, Dmitry Samersoff wrote:
> Hello Rich,
>
> I'm not sure that mapping of INADDR_ANY (0.0.0.0) and return of
> ::ffff:0.0.0.0' has any sense.
>
> Should it be filtered out on musl level?
This is an interesting question. What happens if you bind
::ffff:0.0.0.0 on an IPv6 socket? Is it the same as binding :: or does
it produce a v6 socket that only accepts v4 connections? If it has its
own distinct functionality then returning it when V4MAPPED is
requested seems to make some sense.
Rich
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