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A DNS-over-HTTP cli client written after the draft-ietf-doh-dns-over-https-14

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DNS-over-HTTP reference Client

After I got interested in DNS-over-HTTP I looked at a few implementations. Obviously most of them are pretty complex and do a lot of things, so I started to take a look at the IETF draft "DNS Queries over HTTPS (DoH)"[1] and tried to implement it by my own. This is the result :).

Each implementation detail is covered by a comment with the corresponding section in the IETF draft which (I hope) makes this project to a good reference. Note that this is written after the 14th edition of named draft.

While programming, I got more interested in the RFC 1035 [2] (DNS) as well, which lead to the result to only use code I fully understand. A consequence of it is that only the A RDATA format of an RR is read.

Any kind of contribution to fix this or other issues is welcome.

Usage

$ ./doh-reference-client -h
Usage of ./doh-reference-client:
  -address string
    	host address to resolve
  -method string
    	http method to use. Select "GET" or "POST" (default "GET")
  -server string
    	DoH server address (default "https://mozilla.cloudflare-dns.com/dns-query")

[1]: https://tools.ietf.org/html/draft-ietf-doh-dns-over-https-14
[2]: https://tools.ietf.org/html/rfc1035

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A DNS-over-HTTP cli client written after the draft-ietf-doh-dns-over-https-14

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