Replace Google DNS with Quad9 for example

[Hoerli1337]

Hi!
Would it perhaps be possible to swap the Google DNS via HTTPS server for Quad9, for example?
Quad9 is a bit better in terms of data protection and Google doesn't always have to know everything.

If I have found this correctly, the entry in TMessagesProj\src\main\java\org\telegrams\tgnet\ConnectionsManager.java only needs to be changed from dns.google.com (line 947 + 1061 + 1178) to dns.quad9.net + https://dns.quad9.net/dns-query or https://dns11.quad9.net/dns-query.

An entry in the settings to freely determine the DNS server would of course be extremely great! :)

[drizzt]

It's not so simple, telegram uses the deprecated implementation of DNS over HTTPS that quad9 doesn't support anymore.

You can easily test that:

tredaell@aldebaran ~ ₿ curl -s "https://dns.google.com/resolve?name=www.google.it&type=A"
{"Status":0,"TC":false,"RD":true,"RA":true,"AD":false,"CD":false,"Question":[{"name":"www.google.it.","type":1}],"Answer":[{"name":"www.google.it.","type":1,"TTL":300,"data":"142.250.180.131"}],"Comment":"Response from 216.239.34.10."}
tredaell@aldebaran ~ ₿ curl -s "https://dns.quad9.net/dns-query?name=www.google.it&type=A"
Unable to find the DNS parameter
tredaell@aldebaran ~ ₿

quad9 supports the deprecated implementation only on port 5053

tredaell@aldebaran ~ ₿ curl -s "https://dns.quad9.net:5053/dns-query?name=www.google.it&type=A"
{"Status":0,"TC":false,"RD":true,"RA":true,"AD":false,"CD":false,"Question":[{"name":"www.google.it.","type":1}],"Answer":[{"name":"www.google.it.","type":1,"TTL":294,"Expires":"Fri, 19 Jan 2024 18:02:48 UTC","data":"142.250.186.99"}]}
tredaell@aldebaran ~ ₿

but using port 5353 is bad since dns over https is ONLY used to bypass some firewalls when the usual DNS doesn't work.

I'll accept any PR that implements the current RFC8484 with quad9

[drizzt]

DOH is completely disabled in 10.6.1.1, so we can close this.