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use crate::ResultType;
use anyhow::{anyhow, Context};
use bytes::{Bytes, BytesMut};
use futures::{SinkExt, StreamExt};
use protobuf::Message;
use socket2::{Domain, Socket, Type};
use std::net::SocketAddr;
use tokio::net::{lookup_host, ToSocketAddrs, UdpSocket};
use tokio_socks::{udp::Socks5UdpFramed, IntoTargetAddr, TargetAddr, ToProxyAddrs};
use tokio_util::{codec::BytesCodec, udp::UdpFramed};
pub enum FramedSocket {
Direct(UdpFramed<BytesCodec>),
ProxySocks(Socks5UdpFramed),
}
fn new_socket(addr: SocketAddr, reuse: bool, buf_size: usize) -> Result<Socket, std::io::Error> {
let socket = match addr {
SocketAddr::V4(..) => Socket::new(Domain::ipv4(), Type::dgram(), None),
SocketAddr::V6(..) => Socket::new(Domain::ipv6(), Type::dgram(), None),
}?;
if reuse {
// windows has no reuse_port, but it's reuse_address
// almost equals to unix's reuse_port + reuse_address,
// though may introduce nondeterministic behavior
#[cfg(unix)]
socket.set_reuse_port(true)?;
socket.set_reuse_address(true)?;
}
// only nonblocking work with tokio, https://stackoverflow.com/questions/64649405/receiver-on-tokiompscchannel-only-receives-messages-when-buffer-is-full
socket.set_nonblocking(true)?;
if buf_size > 0 {
socket.set_recv_buffer_size(buf_size).ok();
}
log::info!(
"Receive buf size of udp {}: {:?}",
addr,
socket.recv_buffer_size()
);
if addr.is_ipv6() && addr.ip().is_unspecified() && addr.port() > 0 {
socket.set_only_v6(false).ok();
}
socket.bind(&addr.into())?;
Ok(socket)
}
impl FramedSocket {
pub async fn new<T: ToSocketAddrs>(addr: T) -> ResultType<Self> {
Self::new_reuse(addr, false, 0).await
}
pub async fn new_reuse<T: ToSocketAddrs>(
addr: T,
reuse: bool,
buf_size: usize,
) -> ResultType<Self> {
let addr = lookup_host(&addr)
.await?
.next()
.context("could not resolve to any address")?;
Ok(Self::Direct(UdpFramed::new(
UdpSocket::from_std(new_socket(addr, reuse, buf_size)?.into_udp_socket())?,
BytesCodec::new(),
)))
}
pub async fn new_proxy<'a, 't, P: ToProxyAddrs, T: ToSocketAddrs>(
proxy: P,
local: T,
username: &'a str,
password: &'a str,
ms_timeout: u64,
) -> ResultType<Self> {
let framed = if username.trim().is_empty() {
super::timeout(ms_timeout, Socks5UdpFramed::connect(proxy, Some(local))).await??
} else {
super::timeout(
ms_timeout,
Socks5UdpFramed::connect_with_password(proxy, Some(local), username, password),
)
.await??
};
log::trace!(
"Socks5 udp connected, local addr: {:?}, target addr: {}",
framed.local_addr(),
framed.socks_addr()
);
Ok(Self::ProxySocks(framed))
}
#[inline]
pub async fn send(
&mut self,
msg: &impl Message,
addr: impl IntoTargetAddr<'_>,
) -> ResultType<()> {
let addr = addr.into_target_addr()?.to_owned();
let send_data = Bytes::from(msg.write_to_bytes()?);
match self {
Self::Direct(f) => {
if let TargetAddr::Ip(addr) = addr {
f.send((send_data, addr)).await?
}
}
Self::ProxySocks(f) => f.send((send_data, addr)).await?,
};
Ok(())
}
// https://stackoverflow.com/a/68733302/1926020
#[inline]
pub async fn send_raw(
&mut self,
msg: &'static [u8],
addr: impl IntoTargetAddr<'static>,
) -> ResultType<()> {
let addr = addr.into_target_addr()?.to_owned();
match self {
Self::Direct(f) => {
if let TargetAddr::Ip(addr) = addr {
f.send((Bytes::from(msg), addr)).await?
}
}
Self::ProxySocks(f) => f.send((Bytes::from(msg), addr)).await?,
};
Ok(())
}
#[inline]
pub async fn next(&mut self) -> Option<ResultType<(BytesMut, TargetAddr<'static>)>> {
match self {
Self::Direct(f) => match f.next().await {
Some(Ok((data, addr))) => {
Some(Ok((data, addr.into_target_addr().ok()?.to_owned())))
}
Some(Err(e)) => Some(Err(anyhow!(e))),
None => None,
},
Self::ProxySocks(f) => match f.next().await {
Some(Ok((data, _))) => Some(Ok((data.data, data.dst_addr))),
Some(Err(e)) => Some(Err(anyhow!(e))),
None => None,
},
}
}
#[inline]
pub async fn next_timeout(
&mut self,
ms: u64,
) -> Option<ResultType<(BytesMut, TargetAddr<'static>)>> {
if let Ok(res) =
tokio::time::timeout(std::time::Duration::from_millis(ms), self.next()).await
{
res
} else {
None
}
}
pub fn local_addr(&self) -> Option<SocketAddr> {
if let FramedSocket::Direct(x) = self {
if let Ok(v) = x.get_ref().local_addr() {
return Some(v);
}
}
None
}
}
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