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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