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[Bug network/9981] getaddrinfo(NULL) with AI_PASSIVE returns 0.0.0.0 (IPv4-only) and :: (IPv6+IPv4) in this order


https://sourceware.org/bugzilla/show_bug.cgi?id=9981

--- Comment #11 from Simon Arlott <bugzilla.sourceware.simon at arlott dot org> ---
(In reply to Pavel Åimerda from comment #10)
> (In reply to Simon Arlott from comment #9)
> > It's not safe because the global sysctl net.ipv6.bindv6only could be set to
> > 1 at any time, or the application could use IPV6_V6ONLY=1 on the socket
> > (expecting to receive an IPv4 address too).
> 
> Do you see a better way?

There is nothing getaddrinfo() can do about this. It would have been better to
not have the bindv6only sysctl and require an explicit IPV6_V6ONLY=0 on the
socket, but it's too late for that now.

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