Re: [Wget-dev] wget2 | GSoC'18: Support DNS over HTTPS - Discussions (#378)

[Tim Rühsen]

base64url is base64 with small differences (char index 62 and 63 are different, 
the trailing '=' are omitted). See https://en.wikipedia.org/wiki/Base64. I just 
amended our decoder to also recognize '-' and '_' for char index 62 and 63, so 
just making it a bit more lenient to input.

For encoding there now is wget_base64_urlencode(), but it still pads with '='.

AFAIK, there is no `dns wire format` to `struct addrinfo` parser, you'll have 
to write your own (this is the fun part, isn't it !?). Of course there might 
be, e.g. in the glibc. But ripping it might always be copyright problematic. 
But here is some code written by me that you can use as starter, at least the 
parser part (I just copy the basics, not compilable).

```
ns_initparse(buf, n, &msg);
n = ns_msg_count(msg, ns_s_an);

for (int it = 0; it < n; it++) {
        if (ns_parserr(&msg, ns_s_an, it, &rr)) {
                fprintf(stderr, "ns_parserr: Failed at %d\n", it);
                continue;
        }

        const uint8_t *data = ns_rr_rdata(rr);

        ttl = ns_rr_ttl(rr);
        order = ns_get16(data); data += 2;
        pref = ns_get16(data); data += 2;

        ...
}
```

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