Date: Fri, 6 Mar 2015 23:17:54 +0100
From: Gert Doering <gert@...1296...>
Message-ID: <20150306221754.GA21893@...1296...>
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Subject: Re: [Openvpn-devel] [PATCH] Fix autotools check for res_init
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To: Nicholas Hall <ngharo@...277...>
Cc: openvpn-devel@lists.sourceforge.net

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Hi,

On Fri, Mar 06, 2015 at 01:45:16PM -0600, Nicholas Hall wrote:
> > We use getaddrinfo() and getnameinfo() extensively, which do not require
> > res_init() to be called first...
> >
> > So, instead of adding more convolutions to configure.ac, I propose to
> > throw out res_init() and everything related to it :-) - much easier.
>=20
> res_init seems to be necessary to pick up changes to /etc/resolv.conf
> mid-process (without some low-level caching like nscd). As of master
> right now, OpenVPN never recovers when it's started with bogus
> nameservers in /etc/resolv.conf.

OK, i see.  So getaddrinfo() is affected by calling res_init() repeatedly,
even if it's not necessary for the initial call.

> The steps I describe in bug report #523 is still valid, even though my
> description of the implementation of openvpn_getaddrinfo() was wrong.

I see that we need to fix finding res_init() then.

I'm not sure the patch is the right approach, though - it brings in
system dependent stuff for MacOS to work around a Linux problem, which
can't be right.

Turing around the question: is there any system out there that has=20
tun/tap support but not res_init() (=3D do we need the HAVE_RES_INIT stuff
anyway, as opposed to "just find the right library")?  What about Windows?

gert

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Gert Doering - Munich, Germany                             gert@...1296...
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