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use async_trait::async_trait;
use std::net::SocketAddr;
pub mod shadowsocks;
pub mod udp2tcp;
pub type Result<T> = std::result::Result<T, Error>;
#[derive(thiserror::Error, Debug)]
pub enum Error {
#[error("Failed to create Udp2Tcp obfuscator")]
CreateUdp2TcpObfuscator(#[source] udp2tcp::Error),
#[error("Failed to run Udp2Tcp obfuscator")]
RunUdp2TcpObfuscator(#[source] udp2tcp::Error),
#[error("Failed to initialize Shadowsocks")]
CreateShadowsocksObfuscator(#[source] shadowsocks::Error),
#[error("Failed to run Shadowsocks")]
RunShadowsocksObfuscator(#[source] shadowsocks::Error),
}
#[async_trait]
pub trait Obfuscator: Send {
async fn run(self: Box<Self>) -> Result<()>;
/// Returns the address of the local socket.
fn endpoint(&self) -> SocketAddr;
/// Returns the file descriptor of the outbound socket.
#[cfg(target_os = "android")]
fn remote_socket_fd(&self) -> std::os::unix::io::RawFd;
/// The overhead (in bytes) of this obfuscation protocol.
///
/// This is used when deciding on MTUs.
fn packet_overhead(&self) -> u16;
}
#[derive(Debug)]
pub enum Settings {
Udp2Tcp(udp2tcp::Settings),
Shadowsocks(shadowsocks::Settings),
}
pub async fn create_obfuscator(settings: &Settings) -> Result<Box<dyn Obfuscator>> {
match settings {
Settings::Udp2Tcp(s) => udp2tcp::Udp2Tcp::new(s)
.await
.map(box_obfuscator)
.map_err(Error::CreateUdp2TcpObfuscator),
Settings::Shadowsocks(s) => shadowsocks::Shadowsocks::new(s)
.await
.map(box_obfuscator)
.map_err(Error::CreateShadowsocksObfuscator),
}
}
fn box_obfuscator(obfs: impl Obfuscator + 'static) -> Box<dyn Obfuscator> {
Box::new(obfs) as Box<dyn Obfuscator>
}
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