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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
- From: "bugzilla.sourceware.simon at arlott dot org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Sat, 31 May 2014 11:20:58 +0000
- Subject: [Bug network/9981] getaddrinfo(NULL) with AI_PASSIVE returns 0.0.0.0 (IPv4-only) and :: (IPv6+IPv4) in this order
- Auto-submitted: auto-generated
- References: <bug-9981-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=9981
--- Comment #9 from Simon Arlott <bugzilla.sourceware.simon at arlott dot org> ---
> The only doubt is whether to generate both when the first covers both;
> I'm not when dropping the latter is safe, so I'm leaving that unrelated
> decision out for now.
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).
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