IPv4/IPv6 fallback (happy eyeballs)

[David Woodhouse]

On Sun, 2017-08-13 at 16:40 -0500, Yang Yu wrote:
> It looks like if both A and AAAA record exists for a hostname,
> openconnect tries connecting over IPv6. It waits quite a long time
> before attempting to connect over IPv4. Any plan to implement happy
> eyeballs (RFC6555) like most browsers do?

There wasn't, but I suppose there is now... ;)

It wouldn't be fundamentally difficult — we already do a non-blocking
connect(), and poll for completion. So we already have the various
platform-specific difficulties resolved.

All we really need to do is expand the loop in cancellable_connect() so
that it has two outstanding connections at a time — one for IPv6, and
one for Legacv IP.

Realistically speaking I doubt I'm going to do this imminently. But
what I will try *really* hard to do this week is merge the other
outstanding work, including Daniel's GlobalProtect support, so I'm not
actually discouraging other people from contributing... 
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