BitTorrent Bep 5: DHT Protocol

[casey]

BEP 5

The only metadata-related functionality here is supporting the top-level nodes key, which contains a list of host and port pairs to use to bootstrap the DHT.

Intermodal should support a --node or --dht-nodeflag that takesHOST:PORT` pairs.

Currently, this is blocked on toby/serde-bencode#17, which prevents serializing a list of tuples in a struct, which is the obvious way to represent the value of the nodes key: Vec<(String, u16)>

https://github.com/toby/serde-bencode looks unmaintained, so I might switch to a different library.

https://github.com/P3KI/bendy looks good and well-maintained, and although they don't have serde support, it probably wouldn't be hard to write, which seems like a better option than using an unmaintained crate.

[casey]

Done in #169.