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Support /dns protocol in multiaddr #1575

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merged 9 commits into from
May 18, 2020
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mzabaluev
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The /dns protocol has been added to the spec and has had a de-facto meaning for years (citing multiformats/multiaddr#100)

This adds address parsing and encoding support for /dns to the multiaddr library.

The /dns protocol has been added to the spec and has had a de-facto
meaning for years.
See multiformats/multiaddr#100

This adds address parsing and encoding support for /dns to the multiaddr
format library.
@mzabaluev
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Address resolution for this is not yet implemented in libp2p, but other users of the parity-multiaddr crate could make use of the protocol component in their own ways, e.g. translating a /dns multiaddr to an URL to give to a Happy Eyeballs capable HTTP stack.

@tomaka
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tomaka commented May 14, 2020

Support for it is probably very easy to add to libp2p-dns.
I just don't want to lose track of a semi-implemented feature, and I don't think it's worth opening an issue just for this, so support should probably be added to this PR, or whoever merges this should quickly submit a PR afterwards.

@mzabaluev
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OK, I will try to do here shortly.

mzabaluev added 6 commits May 15, 2020 00:09
The whole thing with back-translating from an redirect URL looks a bit
baroque, but at least now the transport does not completely ignore IPv6
addresses resolved from a hostname in a redirect URL.
@mzabaluev
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@tomaka I have added /dns support to libp2p-dns and a few other places. I get a unit test failure in libp2p-dns, but the same test is also failing in master.

Commits c02bf8d and possibly f76331f may be too disruptive, as they change the behavior of URL-to-multiaddr translations, albeit improving it with regard to IPv6 support.

@mzabaluev mzabaluev requested a review from tomaka May 14, 2020 22:12
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Thanks for the efforts!

Commits c02bf8d and possibly f76331f may be too disruptive, as they change the behavior of URL-to-multiaddr translations, albeit improving it with regard to IPv6 support.

I think that's ok. The new behaviour is exactly what the function is supposed to do.

@@ -70,7 +70,7 @@ fn from_url_inner_http_ws(url: url::Url, lossy: bool) -> std::result::Result<Mul
if let Ok(ip) = hostname.parse::<IpAddr>() {
Protocol::from(ip)
} else {
Protocol::Dns4(hostname.into())
Protocol::Dns(hostname.into())
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Oh, that's actually a great change 🎉

@@ -371,7 +373,7 @@ fn location_to_multiaddr<T>(location: &str) -> Result<Multiaddr, Error<T>> {
let mut a = Multiaddr::empty();
match url.host() {
Some(url::Host::Domain(h)) => {
a.push(Protocol::Dns4(h.into()))
a.push(Protocol::Dns(h.into()))
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Same

@tomaka tomaka merged commit 82156de into libp2p:master May 18, 2020
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2 participants