Re:LittleSnitch for Linux
by littlesnitch on Friday April 10, 2026 @08:08AM
(#47716857)
What exactly do you mean with rDNS resolver?
We do not want the reverse lookup name. For instance, if you look up a google.com name with dig, you get an IP address. If you then do the reverse lookup with dig -x, you get a 1e100.net name. That's as good as the IP address for our purpose.
Plus: We need to respond with a DROP or ALLOW verdict to a network packet without the ability to do any blocking requests. So we can only use information already available in the kernel to decide.
Perhaps there should be a mode where littlesnitch just does its own lookup using the system-configured rDNS, for example from the ui or for specific processes, etc? It should be cached if it is a recent lookup, so minimal performance implications; and offloaded to the system rDNS resolver, so minimal instruction set.