Re: IPv6 mass_dns and nsock_connect_udp

[David Fifield <david () bamsoftware com>]

On Tue, Dec 02, 2008 at 07:06:35PM -0600, Kris Katterjohn wrote:
> > I'm making some progress with a little project to allow mass_rdns to do
> > lookups for IPv6 addresses (async code rather than the system resolver)
> > and to connect to an IPv6 socket on dns servers - I'm using MS Visual
> > C++ EE.
> >
> > I've changed a member of the struct dns_server_s from sockaddr_in to
> > sockaddr_storage and hit a snag after connect_dns_servers() calls
> > nsock_connect_udp().
> >
> > Previously, connect_dns_servers passed a reference to a dns_server_s
> > sockaddr_in casted to a pointer to a sockaddr along with sizeof(struct
> > sockaddr) which are defined as saddr and sslen respectively in
> > nsock_connect_udp.
> > saddr is then casted to pointer to a sockaddr_storage, but sslen remains
> > unchanged:
>
> Instead of passing "sizeof(struct sockaddr)" for sslen, you should pass in the
> size of the struct you're using.  So pass in "sizeof(struct sockaddr_in)" for
> IPv4 or "sizeof(struct sockaddr_in6)" for IPv6.  The current use of sockaddr{}
> works because both it and sockaddr_in{} should always be the same size (look
> at the sin_zero field of the latter).

Kris, is this the same thing as at

"Ncat: socket bind error on Mac OS X"
http://seclists.org/nmap-dev/2008/q3/0168.html

If so, then that thread might help, jah.

David Fifield

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