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Arc, + }, + time::Duration, +}; + +use async_shared_timeout::Timeout; +use bytes::BytesMut; +use chacha20poly1305::{aead::Buffer, AeadCore, AeadInPlace, ChaCha20Poly1305, KeyInit}; +use dashmap::DashMap; +use tokio::{net::UdpSocket, sync::mpsc}; +use typenum::Unsigned; + +#[derive(Debug)] +enum BMut<'a> { + Bytes(BytesMut), + Vec(&'a mut Vec), +} + +impl<'a> Buffer for BMut<'a> { + fn extend_from_slice(&mut self, other: &[u8]) -> chacha20poly1305::aead::Result<()> { + match self { + Self::Bytes(x) => x.extend_from_slice(other), + Self::Vec(x) => x.extend_from_slice(other), + } + Ok(()) + } + fn truncate(&mut self, len: usize) { + match self { + Self::Bytes(x) => x.truncate(len), + Self::Vec(x) => x.truncate(len), + } + } +} +impl<'a> AsRef<[u8]> for BMut<'a> { + fn as_ref(&self) -> &[u8] { + match self { + Self::Bytes(x) => x.as_ref(), + Self::Vec(x) => x.as_ref(), + } + } +} +impl<'a> AsMut<[u8]> for BMut<'a> { + fn as_mut(&mut self) -> &mut [u8] { + match self { + Self::Bytes(x) => x.as_mut(), + Self::Vec(x) => x.as_mut(), + } + } +} + +enum ChanOrSock { + Chan(mpsc::Receiver), + Sock(Arc, Vec), +} + +impl ChanOrSock { + async fn recv(&mut self) -> Option> { + match self { + Self::Chan(x) => x.recv().await.map(BMut::Bytes), + Self::Sock(sock, buf) => { + buf.resize(65536, 0); + let len = sock.recv(buf).await.ok()?; + buf.truncate(len); + Some(BMut::Vec(buf)) + } + } + } +} + +static SESSION_ID: AtomicU32 = AtomicU32::new(0); +static PROTOCOL_VERSION: u8 = 0; + +async fn thread( + (mut rx_enc, sock_enc, enc_addr): (ChanOrSock, Arc, SocketAddr), + (mut rx_dec, sock_dec, dec_addr): (ChanOrSock, Arc, SocketAddr), + server: bool, + chans: Arc>>, + cipher_remote: ChaCha20Poly1305, + cipher_local: ChaCha20Poly1305, +) { + let timeout = Timeout::new( + async_shared_timeout::runtime::Tokio::new(), + Duration::from_secs(1), + ); + let session_id = SESSION_ID.fetch_add(1, Ordering::SeqCst).to_be_bytes(); + let remote_to_local = async { + let mut timeout_set = false; + while let Some(mut buf) = rx_enc.recv().await { + if buf.len() < 12 { + continue; + } + let nonce = <[u8; 12]>::try_from(&buf.as_ref()[buf.len() - 12..]).unwrap(); + let time = chrono::Utc::now().timestamp_nanos_opt().unwrap(); + let nonce1 = [ + nonce[4], nonce[5], nonce[6], nonce[7], nonce[8], nonce[9], nonce[10], nonce[11], + ]; + if i64::from_be_bytes(nonce1).abs_diff(time) > 10_000_000_000 { + eprintln!("got invalid nonce"); + continue; + } + buf.truncate(buf.len() - 12); + if let Err(err) = cipher_remote.decrypt_in_place((&nonce).into(), b"", &mut buf) { + eprintln!("decrypt error: {err}"); + continue; + } + if server { + if !timeout_set { + timeout_set = true; + timeout.set_default_timeout(Duration::from_secs(90)); + } + timeout.reset(); + } + + if let Err(err) = sock_dec.as_ref().send_to(buf.as_ref(), dec_addr).await { + eprintln!("decrypted send error: {err}"); + } + } + }; + let local_to_remote = async { + let mut timeout_set = false; + while let Some(mut buf) = rx_dec.recv().await { + let time = chrono::Utc::now() + .timestamp_nanos_opt() + .unwrap() + .to_be_bytes(); + let nonce = [ + PROTOCOL_VERSION, + session_id[0], + session_id[1], + session_id[2], + time[0], + time[1], + time[2], + time[3], + time[4], + time[5], + time[6], + time[7], + ]; + if let Err(err) = cipher_local.encrypt_in_place((&nonce).into(), b"", &mut buf) { + eprintln!("encrypt error: {err}"); + continue; + } + buf.extend_from_slice(&nonce).unwrap(); + if !server { + if !timeout_set { + timeout_set = true; + timeout.set_default_timeout(Duration::from_secs(90)); + } + timeout.reset(); + } + if let Err(err) = sock_enc.as_ref().send_to(buf.as_ref(), enc_addr).await { + eprintln!("encrypted send error: {err}"); + } + } + }; + tokio::select! { + _ = timeout.wait() => {} + _ = remote_to_local => {} + _ = local_to_remote => {} + } + chans.remove(&enc_addr); +} + +#[tokio::main] +async fn main() { + assert_eq!(::NonceSize::to_usize(), 12); + let mut args = std::env::args().skip(1); + let data = std::fs::read_to_string(args.next().unwrap()) + .unwrap() + .lines() + .map(|x| { + x.split('#') + .next() + .unwrap() + .chars() + .filter(|x| !x.is_whitespace()) + .collect::() + }) + .filter(|x| !x.is_empty()) + .map(|x| { + let (a, b) = x.split_once('=').unwrap_or((&x, "")); + (a.to_owned(), b.to_owned()) + }) + .collect::>(); + let ver: u8 = data.get("version").unwrap().parse().unwrap(); + assert!(matches!(ver, 0)); + let src: SocketAddr = data.get("bind").unwrap().parse().unwrap(); + let dst: SocketAddr = data.get("connect").unwrap().parse().unwrap(); + let h2b = |x: &str| { + x.as_bytes() + .chunks_exact(2) + .map(|x| u8::from_str_radix(std::str::from_utf8(x).unwrap(), 16).unwrap()) + .collect::>() + }; + let key_local = h2b(data.get("key_local").unwrap()); + let key_remote = h2b(data.get("key_remote").unwrap()); + let server = data.contains_key("server"); + let cipher_local = ChaCha20Poly1305::new_from_slice(&key_local).unwrap(); + let cipher_remote = ChaCha20Poly1305::new_from_slice(&key_remote).unwrap(); + let sock = Arc::new(UdpSocket::bind(src).await.unwrap()); + let chans = Arc::new(DashMap::>::new()); + let mut buf = BytesMut::with_capacity(65536); + loop { + buf.resize(65536, 0); + let Ok((len, addr)) = sock.recv_from(&mut buf).await else { + continue; + }; + if let Some(ch) = chans.get(&addr) { + if ch.send(buf.split_to(len)).await.is_ok() { + continue; + } + } + let (tx, rx) = mpsc::channel(128); + tx.send(buf.split_to(len)).await.unwrap(); + chans.insert(addr, tx); + let sock2 = Arc::new( + UdpSocket::bind(( + if dst.is_ipv6() { + IpAddr::V6(Ipv6Addr::UNSPECIFIED) + } else { + IpAddr::V4(Ipv4Addr::UNSPECIFIED) + }, + 0, + )) + .await + .unwrap(), + ); + sock2.connect(dst).await.unwrap(); + let (mut enc, mut dec) = ( + (ChanOrSock::Sock(sock2.clone(), vec![]), sock2, dst), + (ChanOrSock::Chan(rx), sock.clone(), addr), + ); + if server { + mem::swap(&mut enc, &mut dec); + } + tokio::spawn(thread( + enc, + dec, + server, + chans.clone(), + cipher_remote.clone(), + cipher_local.clone(), + )); + } +}