Re: Linux.conf.au 2003 Report

Kurt Roeckx wrote:
> On Sat, Feb 01, 2003 at 02:35:15PM +0900, Curt Sampson wrote:
> >
> > Sure. But you still want to be able to say (and can say, in some [many?]
> > socket API implementations) that you want to accept only IPv4 or only IPv6
> > connections. I also want to be able to say the same thing in my database.
>
> You just create either an ipv4 or ipv6 socket. And then you can
> bind to an address of that type if you want. Either all
> addresses or a specific one.
>
> Depending on the OS, binding to all addresses on IPv6 will also
> bind to all the ipv4 addresses, which can be both handy an
> annoying. On others you need 2 sockets if you want to listen on
> both ipv4 and ipv6, which makes more sense.

Well, that's interesting. Current CVS only binds to IPv6, and assumes
IPv4 will work too. If some OS's require a separate Ipv4 binding, we
are going to hear about it before 7.4:

---------------------------------------------------------------------------

#ifdef HAVE_IPV6
/* Try INET6 first. May fail if kernel doesn't support IP6 */
status = StreamServerPort(AF_INET6, VirtualHost,
(unsigned short) PostPortNumber,
UnixSocketDir,
&ServerSock_INET);
if (status != STATUS_OK)
{
elog(LOG, "IPv6 support disabled --- perhaps the kernel does not support IPv6");
#endif
status = StreamServerPort(AF_INET, VirtualHost,
(unsigned short) PostPortNumber,
UnixSocketDir,
&ServerSock_INET);
if (status != STATUS_OK)
{
postmaster_error("cannot create INET stream port");
ExitPostmaster(1);
}
#ifdef HAVE_IPV6
else
elog(LOG, "IPv4 socket created");
}
#endif
}

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