Re: determining an endpoint's family - endpoint_type/protocol_type?

Hi Richard,

Richard Dingwall <rdingwall-Re5JQEeQqe8AvxtiuMwx3w@xxxxxxxxxxxxxxxx> wrote:
> I am developing an FTP client with boost::asio, and I wish to
> determine whether an endpoint (generated by a resolver) is
> IPv4 or IPv6.
>
> The only way I can see how is to compare
> endpoint.protocol().family() with AF_INET and AF_INET6, which
> doesn't feel like the right way. An alternative would be to
> specify the desired family before the host is resolved, or to
> simply compare the endpoint's family against some predefined
> boost::asio::ip::ipv6/ipv4 members.
>
> The difference between IPv4 and IPv6 is quite significant for
> FTP, as they require a different set of (mostly incompatible)
> commands to negotiate data connections.
>
> Any suggestions? (Probably I have missed something :)

If you're using the version in CVS you can use
endp.address().is_v4() or endp.address().is_v6().

Another method in the TR2 proposal but not yet in CVS is the
ability to test protocol objects for equality, e.g.:

  endp.protocol() == ip::tcp::v4()

This seems to me to be the more natural expression for your use
case, so I will make this change right away.

Cheers,
Chris



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