Here is an example of how one can use DOH "like ping or nslookup". This example ...

Here is an example of how one can use DOH "like ping or nslookup". This example uses HTTP POST and cloudflare-dns. Maybe check out "stubby" for "OS-level" DOH. Currently I think it only does DOT but future plans are for DOH.

  test $# = 1|| exec echo usage: $0 query

  # requirements: sed, wc, xxd, openssl, ldns, drill
  # reference: https://tools.ietf.org/html/rfc8484#section-4.1

  a=$(drill -q /dev/stdout $1 |sed '1,2d;s/;.*//;s/ //g'|xxd -p -r|wc -m);

(printf "POST /dns-query HTTP/1.1\r\nHost: cloudflare-dns.com\r\nAccept: /\r\nContent-Type: application/dns-message\r\nConnection: close\r\nContent-Length: $a\r\n\r\n"; drill -q /dev/stdout $1|sed '1,2d;s/;.*//;s/ //g;3s/..../0001/'|xxd -p -r)|openssl s_client -no_tls1 -no_tls1_1 -no_ssl2 -no_ssl3 -ign_eof -no_ticket -host cloudflare-dns.com -port 443 -servername 1.1.1.1|sed -n \$p|xxd -p|drill -i /dev/stdin|sed '/^;; Data: \\#/d'