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Date: Mon, 9 Jun 2014 14:53:37 -0400
From: Rich Felker <>
Subject: Re: ipv6 scope id support

On Mon, Jun 09, 2014 at 10:35:39PM +0800, orc wrote:
> Hi list!
> Great to see major changes towards dns code cleanup and rewrite! Here another one:
> As I understand, this is a feature when you can specify destination link-local address and from which interface packets are sent. The address and interface are both specified, being separated by '%' (for example, ff02::1%eth0)
> I've grepped into glibc sources and found that this step is performed somewhere in dns resolver.
> Does musl support this? My current attempt to use it failed.

Can you explain what you did that failed? getaddrinfo should always
accept %nnnn (numeric scope_id) following a numeric address string,
and accepts %ifname if the address has link-local scope (as determined
getnameinfo will reverse the scope_id to an interface name only fork
link-local addresses, and the reversal can be inhibited with the

For non-numeric addresses, scope_id is not parsed at all, but entries
in /etc/hosts can have a scope_id attached to them.

If any of this logic seems incorrect to you, please explain what you
think should be changed.


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