| //! The second version of the autonat protocol. | |
| //! | |
| //! The implementation follows the [libp2p spec](https://github.com/libp2p/specs/blob/03718ef0f2dea4a756a85ba716ee33f97e4a6d6c/autonat/autonat-v2.md). | |
| //! | |
| //! The new version fixes the issues of the first version: | |
| //! - The server now always dials back over a newly allocated port. This greatly reduces the risk of | |
| //! false positives that often occurred in the first version, when the clinet-server connection | |
| //! occurred over a hole-punched port. | |
| //! - The server protects against DoS attacks by requiring the client to send more data to the | |
| //! server then the dial back puts on the client, thus making the protocol unatractive for an | |
| //! attacker. | |
| //! | |
| //! The protocol is seperated into two parts: | |
| //! - The client part, which is implemented in the `client` module. (The client is the party that | |
| //! wants to check if it is reachable from the outside.) | |
| //! - The server part, which is implemented in the `server` module. (The server is the party | |
| //! performing reachability checks on behalf of the client.) | |
| //! | |
| //! The two can be used together. | |
| use libp2p_swarm::StreamProtocol; | |
| pub mod client; | |
| pub(crate) mod protocol; | |
| pub mod server; | |
| pub(crate) mod generated { | |
| include!("v2/generated/mod.rs"); | |
| } | |
| pub(crate) const DIAL_REQUEST_PROTOCOL: StreamProtocol = | |
| StreamProtocol::new("/libp2p/autonat/2/dial-request"); | |
| pub(crate) const DIAL_BACK_PROTOCOL: StreamProtocol = | |
| StreamProtocol::new("/libp2p/autonat/2/dial-back"); | |
| type Nonce = u64; | |