Implementation of domain name filtering function

[GuoanYou]

Thanks for your great project!
I’ve successfully flashed the firmware onto my ESP32-S3 and am now using it as an in-vehicle WiFi repeater.
I’d like to ask if you could add domain whitelist and blacklist features similar to dnsmasq? I tried implementing this with Codex but failed.

[martin-ger]

Generally, it would be possible to intercept requests to 53 (DNS) and block port 853 (DNS over TLS), but if a browser uses DNS over HTTPS as most modern browsers allow, you cannot identify DNS requests and block domains at network level. Do you have special (dumb) devices in mind?

Perhaps the easiest way to filter plain DNS would be to use set_ap_dns <your_ip> (if you have a trustworthy DNS server somewhere on the net) and use an outgoing ACL to block any other hosts on port 53 and 853 at all.