wss: sni addrs support

[guillaumemichel]

Description

SNI addresses of the format /ip4/192.0.2.0/tcp/1234/tls/sni/foo.example.com/ws don't seem to be supported for websockets in rust-libp2p.

Motivation

autotls is a new service allowing nodes to request a tls certificate matching their peer ID, allowing libp2p nodes to act as wss servers without having to manually configure a certificate tied to a domain name. The default advertised addresses are of the format /ip4/192.0.2.0/tcp/1234/tls/sni/192-0-2-0.<peerid>.libp2p.direct/ws, and rust-libp2p nodes were unable to dial these types of addresses. However, rust-libp2p nodes were able to dial addresses like /dns4/192-0-2-0.<peerid>.libp2p.direct/tcp/1234/tls/ws.

Also libp2p websockets spec specifies that sni addresses should be supported.

Current Implementation

This new address format was added in the specs 3 months ago, hence this may be the reason why it isn't implemented yet.

Related: #5529 (comment)

cc: @oblique I believe this change would benefit Lumina. If autotls is deployed in celestia-node, it means that browser nodes would be able to connect to much more nodes in the Celestia network.

Are you planning to do it yourself in a pull request?

No