New module: encrypted-dns

[chrisforce1]

DNS tunneling over DNS-over-HTTPS (DoH) to *.sandbox.alphasoc.xyz via a random public server picked from the list below.

https://dns.google/dns-query
https://cloudflare-dns.com/dns-query
https://dns.quad9.net/dns-query
https://doh.opendns.com/dns-query
https://doh.powerdns.org -- shutdown planned for 15.09.2021 according to https://powerdns.org/doh/privacy.html

[chrisforce1]

From our chat we could invoke this module in these kind of ways, and extend beyond DoH to DoT and DNSCrypt, e.g.

flightsim run encrypted-dns:doh
flightsim run encrypted-dns:dnscrypt

Invoking without a protocol argument would just run some random DoH / DoT / DNSCrypt tests (dealer's choice).

Here are the notes for the other transport mechanisms:

• DNS over TLS (runs over TCP 853)
• DNSCrypt (runs over TCP or UDP 443 but also other ports)