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Re: Ordering of nameserver addresses in resolver state struct
- From: OndÅej BÃlka <neleai at seznam dot cz>
- To: Michal Sekletár <sekletar dot m at gmail dot com>
- Cc: libc-help at sourceware dot org
- Date: Mon, 7 Oct 2013 14:56:02 +0200
- Subject: Re: Ordering of nameserver addresses in resolver state struct
- Authentication-results: sourceware.org; auth=none
- References: <CAJ7VeQy8wuYAb+J=BhPMJwq=kU5rvr3PZZ_WjC0h7j9ZAo+kjg at mail dot gmail dot com>
On Thu, Sep 19, 2013 at 11:13:39PM +0200, Michal Sekletár wrote:
> Hi glibc hackers,
>
> I came across following fact which to me seems like an inconsistency, maybe
> worth to fix.
>
Could you file a bug for this one?
> Consider system which has dns resolver configured with 3 dns server
> addresses. Second address is IPv6 other two are IPv4 addresses, please keep the
> ordering in mind.
>
> State of dns resolver is such that arrays of nameserver addresses nsaddr_list
> contains two entries and the third one contains all zeroes. This doesn't
> correspond to the order of nameservers in /etc/resolv.conf since IPv4
> nameservers are first and third in the file. However array _u._ext.nsaddrs
> containing pointers to sockaddr_in6 structures has following content : [nil, ptr
> , nil]. It reflects ordering in resolv.conf.
>
> Is this intentional? I think that order in later case should be [ptr, nil, nil].
>
> Cheers,
>
> Michal