Better error handling when accessing network interface

[imsnif]

Right now this function:

bandwhich/src/os/shared.rs

Line 34 in 6190391

fn get_datalink_channel(

Uses std::io::Error, probably not as it was intended, in order to differentiate between a permission error, a general network error and an unknown interface type (one that libpnet does not support).

It would be nice if we had our own error type for this, that would allow us to have the same functionality we have now (alerting the user that they need more permissions, recommending they run with sudo, or indicating that it could not find any interfaces to listen on).

This pattern might be a good option, though I'm not 100% sure it will fit in this case: https://rust-lang-nursery.github.io/failure/error-errorkind.html

[captain-yossarian]

Hi @imsnif , can I try?

[imsnif]

Hi @imsnif , can I try?

Happily :)

[imsnif]

Done, thanks @captain-yossarian !