On May 22, 2005, at 3:43 AM, Giuliano Gavazzi wrote:
well, would it not be enough to add manually a route for the
particular remote ip/net going through the dead router (and thus
the interface he wants)?
now THIS is the kind of thinking it's gonna take to get this working!
great suggestion, and creative.
it requires that my app will have to be set to run as root
unfortunately, but at this point i'm desperate.
plus, i've buttoned up all possible places where buffers are
flooded with user input. everything's bounds-checked.
i have a couple of questions about this suggestion:
[1] if i add a route, how do i make sure that the new
route is chosen and nothing else?
The routing engine picks the route that is the more specific for the
destination address. A host route is the more specific kind of route,
so simply add a host route with the IP address of the dead router.
[2] after using it, does the route need to be removed
explicitly, or is closing the socket i used thru it
enough?
You need to remove the route yourself, there is no connection between
the socket layer and the routing table.
[3] does adding a new route or deleting a route only
apply to the context of my app or does it affect
the entire system?
It's a system wide setting (that's why it's a privileged operation)
[4] i have already played with this a little, but the
examples i'm going off of are a little over-the-top.
if you know of a simple example of how this is done
in C, please post a link.
I suggest to have a look at the source code of the "route" command in
Darwin or FreeBSD repository.
and by the way, Giuliano, thanks for actually helping out instead
of talking down to me and then giving me a reading assignment.
i've been plagued with unhelpful responses on this issue on three
lists... mostly from the same guy chasing me from list to list.
Because you have out of the ordinary requirements you really need to
understand what you are doing especially when changing system wide
settings.
Vincent
Giuliano, you rock.
- philip
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