shadowsocks 1.24.0

shadowsocks is a fast tunnel proxy that helps you bypass firewalls.
Documentation 
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//! Relay for UDP implementation
//!
//! ## ShadowSocks UDP protocol
//!
//! SOCKS5 UDP Request
//! ```ignore
//! +----+------+------+----------+----------+----------+
//! |RSV | FRAG | ATYP | DST.ADDR | DST.PORT |   DATA   |
//! +----+------+------+----------+----------+----------+
//! | 2  |  1   |  1   | Variable |    2     | Variable |
//! +----+------+------+----------+----------+----------+
//! ```
//!
//! SOCKS5 UDP Response
//! ```ignore
//! +----+------+------+----------+----------+----------+
//! |RSV | FRAG | ATYP | DST.ADDR | DST.PORT |   DATA   |
//! +----+------+------+----------+----------+----------+
//! | 2  |  1   |  1   | Variable |    2     | Variable |
//! +----+------+------+----------+----------+----------+
//! ```
//!
//! shadowsocks UDP Request (before encrypted)
//! ```ignore
//! +------+----------+----------+----------+
//! | ATYP | DST.ADDR | DST.PORT |   DATA   |
//! +------+----------+----------+----------+
//! |  1   | Variable |    2     | Variable |
//! +------+----------+----------+----------+
//! ```
//!
//! shadowsocks UDP Response (before encrypted)
//! ```ignore
//! +------+----------+----------+----------+
//! | ATYP | DST.ADDR | DST.PORT |   DATA   |
//! +------+----------+----------+----------+
//! |  1   | Variable |    2     | Variable |
//! +------+----------+----------+----------+
//! ```
//!
//! shadowsocks UDP Request and Response (after encrypted)
//! ```ignore
//! +-------+--------------+
//! |   IV  |    PAYLOAD   |
//! +-------+--------------+
//! | Fixed |   Variable   |
//! +-------+--------------+
//! ```

use std::time::Duration;

pub use self::proxy_socket::ProxySocket;
pub use compat::{DatagramReceive, DatagramReceiveExt, DatagramSend, DatagramSendExt, DatagramSocket};

#[cfg(feature = "aead-cipher")]
mod aead;
#[cfg(feature = "aead-cipher-2022")]
mod aead_2022;
mod compat;
pub mod crypto_io;
pub mod options;
pub mod proxy_socket;
#[cfg(feature = "stream-cipher")]
mod stream;

/// The maximum UDP payload size (defined in the original shadowsocks Python)
///
/// *I cannot find any references about why clowwindy used this value as the maximum
/// Socks5 UDP ASSOCIATE packet size. The only thing I can find is
/// [here](http://support.microsoft.com/kb/822061/)*
pub const MAXIMUM_UDP_PAYLOAD_SIZE: usize = 65536;

/// Default association expire time
pub const DEFAULT_TIMEOUT: Duration = Duration::from_secs(5 * 60);