Pick an interface based on a target IP

[todb-r7]

As a user, I would like to be able to communicate to NetworkInterface the IP address I'm trying to reach. You can determine which is the best interface based on the routing table.

The code should look something like:

ipaddr = '127.1.1.1'
NetworkInterface.pick_interface(ipaddr) # => 'lo'
ipaddr = '10.0.0.1'
NetworkInterface.pick_interface(ipaddr) # => 'eth0'
ipaddr = '8.8.8.8'
NetworkInterface.pick_interface(ipaddr) # => 'wlan0'

Something like that.

cc @sho-luv

[todb-r7]

Obviously error and unreachable addresses should be handled as well with a raise or something.

[busterb]

I guess this is so that a user doesn't have to set INTERFACE on an exploit using the capture mixin as long as CHOST or a reasonable default are selected?