233 lines
8.1 KiB
Rust
233 lines
8.1 KiB
Rust
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* client.rs :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: tomoron <tomoron@student.42angouleme.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2026/05/07 17:23:09 by tomoron #+# #+# */
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/* Updated: 2026/05/19 18:57:29 by tomoron ### ########.fr */
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/* */
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/* ************************************************************************** */
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use json::object;
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use tokio::net::TcpStream;
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use std::collections::VecDeque;
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use crate::minecraft::handshake::Handshake;
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use crate::minecraft::varint::{varint_read, varint_write};
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use std::{fmt, io};
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pub struct Client {
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pub in_stream: TcpStream,
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buffer: Vec<u8>,
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out_stream: Option<TcpStream>,
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handshake: Option<Handshake>
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}
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impl Client {
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pub fn create(stream: TcpStream) -> Self {
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Self {
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in_stream: stream,
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buffer: vec![],
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out_stream: None,
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handshake: None
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}
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}
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pub async fn in_read(&mut self) -> Result<u8, String> {
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let mut buf = vec![0 as u8; 100];
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loop
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{
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match self.in_stream.try_read(&mut buf) {
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Ok(n) => {
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println!("[{}] read {} bytes",self, n);
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println!("[{}] {:?}", self, &buf[..n]);
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self.buffer_append((&buf[..n]).to_vec()).await?;
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if n == 0 {
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return Ok(0)
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}
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}
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Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
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return Ok(1);
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}
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Err(_e) => {
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println!("[{}] error", self);
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return Err("read failed".to_string())
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}
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}
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}
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}
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pub async fn out_readable(&self) {
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if let Some(stream) = &self.out_stream {
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stream.readable().await.expect("readable call failed");
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} else {
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std::future::pending::<()>().await;
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};
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}
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pub async fn out_read(&mut self) -> Result<i32, String> {
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let mut buf = vec![0 as u8; 1024];
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if let None = self.out_stream {
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return Ok(1);
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}
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match self.out_stream.as_mut().unwrap().try_read(&mut buf) {
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Ok(n) => {
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let _ = self.in_stream.writable().await;
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let _ = self.in_stream.try_write(&buf[..n]);
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if n == 0 { Ok(0) } else { Ok(1) }
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}
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Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
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Ok(1)
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}
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Err(_e) => {
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println!("try_read returned an error");
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Err("Failed to read".to_string())
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}
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}
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}
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pub async fn buffer_append(&mut self, data: Vec<u8>) -> Result<u8,String> {
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if data.len() == 0 {
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return Ok(0);
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}
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println!("[{}] buffer handling", self);
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if let Some(out_stream) = &self.out_stream {
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println!("[{}] out stream present passing buffer", self);
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let _ = out_stream.writable().await;
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let _ = out_stream.try_write(&data);
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return Ok(0);
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}
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if self.buffer.len() + data.len() > 65536 {
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return Err("buffer full".to_string());
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}
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let _ = self.buffer.extend(data);
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if self.buffer[0] == 0 {
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return Err("invalid packet".to_string());
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}
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if self.buffer.len() - 1 >= self.buffer[0] as usize {
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println!("[{}] valid packet received", self);
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let len = varint_read(&mut self.buffer.clone().into())? as usize;
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self.handle_packet(self.buffer[1..=len].to_vec().into()).await?;
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self.buffer.drain(..len + 1);
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return Ok(1);
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}
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Ok(0)
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}
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async fn send_packet(&self, data: Vec<u8>) {
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let mut sent_data: Vec<u8> = varint_write(data.len() as i32);
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sent_data.extend(data);
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let _ = self.in_stream.writable().await;
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match self.in_stream.try_write(sent_data.as_slice()) {
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Err(e) => { eprintln!("error while sending response {:?}", e); },
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_ => { }
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}
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}
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async fn handle_packet(&mut self, mut packet: VecDeque<u8>) -> Result<(), String> {
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let packet_id = varint_read(&mut packet)?;
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if self.handshake.is_none() {
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if packet_id != 0 {
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return Err("packet 0 expected. invalid packet received".to_string());
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}
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self.handshake = Some(Handshake::from_packet(&mut packet)?);
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use std::os::unix::io::AsRawFd;
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let fd = self.in_stream.as_raw_fd();
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println!("{} => {}", fd, self);
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println!("[{}] got {}",self, self.handshake.as_ref().unwrap());
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return Ok(());
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}
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let intent = self.handshake.as_ref().unwrap().intent;
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if intent == 1 {
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self.status_intent_handle(&mut packet, packet_id).await?;
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} else if intent == 2 {
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self.login_intent_handle(&mut packet, packet_id).await?;
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}
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Ok(())
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}
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async fn status_intent_handle(&self, packet: &mut VecDeque<u8>, packet_id: i32) -> Result<(),String> {
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let status_response = object! {
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"version": {
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"name": "idk",
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"protocol" : self.handshake.as_ref().unwrap().protocol_version,
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},
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"players": {
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"max": 420,
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"online": 69
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},
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"description": "§c".to_string() + &self.handshake.as_ref().unwrap().server_address.clone() + "§r:§a" + &self.handshake.as_ref().unwrap().server_port.to_string(),
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};
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if packet_id == 0 {
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let mut response : Vec<u8> = vec![];
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let response_json = json::stringify(status_response);
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let mut response_json_len = varint_write(response_json.len() as i32);
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let mut response_packet_id = varint_write(0);
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response.append(&mut response_packet_id);
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response.append(&mut response_json_len);
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response.append(&mut response_json.as_bytes().into());
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println!("[{}] sent status response to client", self);
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self.send_packet(response).await;
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} else if packet_id == 1 {
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let mut response = varint_write(1);
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response.extend(packet.drain(..));
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self.send_packet(response).await;
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println!("[{}] sent ping response to client", self);
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}
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Ok(())
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}
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async fn login_intent_handle(&mut self, mut _packet: &mut VecDeque<u8>, _packet_id: i32) -> Result<(),String> {
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let stream = TcpStream::connect("localhost:25566").await.map_err(|_| "failed to connect to remote host".to_string())?;
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let mut new_handshake = self.handshake.as_ref().unwrap().clone();
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new_handshake.server_address = "localhost".to_string();
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new_handshake.server_port = 25566;
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println!("{}", new_handshake);
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let handshake_packet = new_handshake.to_packet();
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let mut packet = Vec::new();
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packet.extend(varint_write(handshake_packet.len() as i32));
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packet.extend(handshake_packet);
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self.out_stream = Some(stream);
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let _ = self.out_stream.as_ref().unwrap().writable().await;
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let _ = self.out_stream.as_ref().unwrap().try_write(packet.as_slice());
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println!("[{}] sent handshake to server", self);
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Ok(())
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}
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}
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impl fmt::Display for Client {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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if let Some(handshake) = &self.handshake {
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write!(f, "{}", handshake.server_address)
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} else {
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use std::os::unix::io::AsRawFd;
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write!(f, "{}", self.in_stream.as_raw_fd())
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}
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}
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}
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