On Wed, Nov 19, 2014 at 03:52:37PM +0200, Vlad Khorsun wrote:
> 19.11.2014 13:52, Michal Kubecek wrote:
> > Could you please try attached patch? It uses AF_UNSPEC in getaddrinfo()
> > hints whenever host string is non-empty and retries getaddrinfo() with
> > AF_UNSPEC if AF_INET6 fails for empty host string.
>
> It doesn't look at error codes and tries to guess what happens. For
> example, if first call of getaddrinfo() returns error because of
> wrong service name, code will change ai_family without a reason to
> do it. Second call will fail too (because reason was not fixed).
> Third call with fixed service name will succeed but with AF_UNSPEC
> in ai_family. Is it how it supposed to work ?
Could you check if first getaddrinfo() call returns EAI_FAMILY on
Windows XP without IPv6 support? The way I read the manual page it
should but I would rather make sure.
> > Handling Windows XP with IPv6 support will be more tricky. What might
> > work would be to move the attempt to set IPV6_V6ONLY earlier, before
> > getaddrinfo() is called, and also use AF_UNSPEC if setting IPV6_V6ONLY
> > to 0 failed.
>
> You assume that IPv6 support is more important than IPv4. Why ?
No, I don't. The reason for AF_INET6 is that a PF_INET6 socket bound to
:: can accept both IPv6 and IPv4 connections (as long as IPV6_V6ONLY is
0 and the system supports this setting) while a PF_INET socket can only
accept IPv4 connections. Therefore PF_INET6 should be preferred if we
want to listen on "any address" (as long as we can only use one socket).
Michal Kubecek
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