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Date: Thu, 25 Jul 2013 01:59:13 -0400
From: Rich Felker <>
Subject: Re: [PATCH] inet_ntop() and ipv4 address

On Thu, Jul 25, 2013 at 12:21:27PM +0800, orc wrote:
> inet_ntop() does not embed plain ipv4 address at end (like
> "::ffff:"). This patch fixes it, but it is a bit ugly. Without
> it is a bit harder to read logs of some daemons that support only one
> address family socket binding and seeing output of 'ss -tn'. Adopt if
> needed.

As I understand it, the "IPv4 compatible" addresses (::a.b.c.d) are
deprecated and have never actually been used in deployed IPv6. Only
the v4-mapped form (::ffff:a.b.c.d) is used/usable. For the most part,
supporting the useless form seems harmless, but there is one harmful
case: it looks like your code will wrongly convert :: to ::
instead of plain ::. Is it worth trying to keep the "v4 compatible"
form supported and just special-casing ::, or should we just drop it?


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