On Fri, 2005-06-17 at 14:31 -0400, mclellan, dave wrote:
> Hi list folks: I am searching out how to set the sin6_scope_id member field
> of the sockaddr_in6 structure when it contains a link-local address.
How did you get the link-local address in the first place? The entity
that provided that information should also provide sin6_scope_id.
>
>
> I know that if_nametoindex() is supposed to return the scope of the
> interface, given a name, e.g.
No, that function returns the interface index for a given interface.
It may just so happen that the two are the same on multiple
implementations. That doesn't mean that you should assume that its
true for all implementations.
> struct sockaddr_in6 sa;
> sa.sin6_scope_id = if_nametoindex("eth0");
This is really playing with fire... interface index does have to
equal scope_id.
>
> My main question is: how do I deteminre the name to pass to
> if_nametoindex()? I am supporting Solaris, AIX, HP, Tru64, Linux kernels,
> and Win2K and WIN IA.
This should really be provided to you by the entity that provided the
link-local address. So, if the user type it in, he should have provided
a scope-id. If you got it from a system call, the system should have
provided the scope_id.
-vlad
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