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use crate::client::discovery;
use crate::client::discovery::DiscoveryStatus;
use crate::client::discovery::MtuDiscovery;
use crate::client::util::send_packet;
use crate::connection::queue::send::SendQueue;
use crate::connection::queue::RecvQueue;
use crate::protocol::frame::FramePacket;
use crate::protocol::packet::offline::{SessionInfoReply, SessionInfoRequest};
use crate::protocol::packet::online::ConnectedPong;
use crate::protocol::packet::online::{ConnectionRequest, NewConnection, OnlinePacket};
use crate::protocol::reliability::Reliability;
use crate::protocol::Magic;
use crate::rakrs_debug;
use crate::server::current_epoch;
#[cfg(feature = "async_std")]
use async_std::{
future::timeout,
future::Future,
net::UdpSocket,
task::{self, Context, Poll, Waker},
};
use binary_util::interfaces::Reader;
use binary_util::io::ByteReader;
#[cfg(feature = "async_tokio")]
use std::future::Future;
use std::sync::Arc;
use std::sync::Mutex;
#[cfg(feature = "async_tokio")]
use std::task::{Context, Poll, Waker};
use std::time::Duration;
#[cfg(feature = "async_tokio")]
use tokio::{
net::UdpSocket,
task::{self},
time::timeout,
};
#[macro_export]
macro_rules! match_ids {
($socket: expr, $($ids: expr),*) => {
{
let mut recv_buf: [u8; 2048] = [0; 2048];
let mut tries: u8 = 0;
let ids = vec![$($ids),*];
let mut pk: Option<Vec<u8>> = None;
'try_conn: loop {
if (tries >= 5) {
break;
}
let len: usize;
let send_result = timeout(
Duration::from_secs(2),
$socket.recv(&mut recv_buf)
).await;
if (send_result.is_err()) {
rakrs_debug!(true, "[CLIENT] Failed to receive packet from server! Is it offline?");
break 'try_conn;
}
match send_result.unwrap() {
Err(_) => {
tries += 1;
continue;
},
Ok(l) => len = l
};
// rakrs_debug!(true, "[CLIENT] Received packet from server: {:x?}", &recv_buf[..len]);
if ids.contains(&recv_buf[0]) {
pk = Some(recv_buf[..len].to_vec());
break 'try_conn;
}
}
pk
}
};
}
macro_rules! expect_reply {
($socket: expr, $reply: ty) => {{
let mut recv_buf: [u8; 2048] = [0; 2048];
let mut tries: u8 = 0;
let mut pk: Option<$reply> = None;
loop {
if (tries >= 5) {
break;
}
let len: usize;
let send_result = timeout(Duration::from_secs(4), $socket.recv(&mut recv_buf)).await;
if (send_result.is_err()) {
rakrs_debug!(
true,
"[CLIENT] Failed to receive packet from server! Is it offline?"
);
break;
}
match send_result.unwrap() {
Err(_) => {
tries += 1;
continue;
}
Ok(l) => len = l,
};
// rakrs_debug!(true, "[CLIENT] Received packet from server: {:x?}", &recv_buf[..len]);
let mut reader = ByteReader::from(&recv_buf[1..len]);
if let Ok(packet) = <$reply>::read(&mut reader) {
pk = Some(packet);
break;
} else {
rakrs_debug!(true, "[CLIENT] Failed to parse packet!");
}
}
pk
}};
}
macro_rules! update_state {
($done: expr, $shared_state: expr, $state: expr) => {{
let mut state = $shared_state.lock().unwrap();
state.status = $state;
state.done = true;
if let Some(waker) = state.waker.take() {
waker.wake();
}
return;
}};
($shared_state: expr, $state: expr) => {{
let mut state = $shared_state.lock().unwrap();
state.status = $state;
state.done = false;
if let Some(waker) = state.waker.take() {
waker.wake();
}
}};
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum HandshakeStatus {
Created,
Opening,
SessionOpen,
Failed,
IncompatibleVersion,
Completed,
}
pub(crate) struct HandshakeState {
status: HandshakeStatus,
done: bool,
waker: Option<Waker>,
}
pub struct ClientHandshake {
status: Arc<Mutex<HandshakeState>>,
}
impl ClientHandshake {
pub fn new(socket: Arc<UdpSocket>, id: i64, version: u8, mut mtu: u16, attempts: u8) -> Self {
let state = Arc::new(Mutex::new(HandshakeState {
done: false,
status: HandshakeStatus::Created,
waker: None,
}));
let shared_state = state.clone();
task::spawn(async move {
update_state!(shared_state, HandshakeStatus::Opening);
rakrs_debug!(true, "[CLIENT] Sending OpenConnectRequest to server...");
match MtuDiscovery::new(
socket.clone(),
discovery::MtuDiscoveryMeta { id, version, mtu },
)
.await
{
DiscoveryStatus::Discovered(m) => {
rakrs_debug!(true, "[CLIENT] Discovered MTU size: {}", m);
mtu = m;
}
_ => update_state!(true, shared_state, HandshakeStatus::Failed),
}
let session_info = SessionInfoRequest {
magic: Magic::new(),
address: socket.peer_addr().unwrap(),
mtu_size: mtu,
client_id: id,
};
rakrs_debug!(true, "[CLIENT] Sending SessionInfoRequest to server...");
update_state!(shared_state, HandshakeStatus::SessionOpen);
if !send_packet(&socket, session_info.into()).await {
update_state!(true, shared_state, HandshakeStatus::Failed);
}
let session_reply = expect_reply!(socket, SessionInfoReply);
if session_reply.is_none() {
update_state!(true, shared_state, HandshakeStatus::Failed);
}
let session_reply = session_reply.unwrap();
if session_reply.mtu_size != mtu {
update_state!(true, shared_state, HandshakeStatus::Failed);
}
rakrs_debug!(true, "[CLIENT] Received SessionInfoReply from server!");
// create a temporary sendq
let mut send_q = SendQueue::new(
mtu,
5000,
attempts.clone().into(),
socket.clone(),
socket.peer_addr().unwrap(),
);
let mut recv_q = RecvQueue::new();
if let Err(_) = Self::send_connection_request(&mut send_q, id).await {
update_state!(true, shared_state, HandshakeStatus::Failed);
}
rakrs_debug!(true, "[CLIENT] Sent ConnectionRequest to server!");
let mut send_time = current_epoch() as i64;
let mut tries = 0_u8;
let mut buf: [u8; 2048] = [0; 2048];
loop {
let len: usize;
let rec = socket.recv_from(&mut buf).await;
if (send_time + 2) <= current_epoch() as i64 {
send_time = current_epoch() as i64;
rakrs_debug!(
true,
"[CLIENT] Server did not reply with ConnectAccept, sending another..."
);
if let Err(_) = Self::send_connection_request(&mut send_q, id).await {
update_state!(true, shared_state, HandshakeStatus::Failed);
}
tries += 1;
if tries >= 5 {
update_state!(true, shared_state, HandshakeStatus::Failed);
}
}
match rec {
Err(_) => {
continue;
}
Ok((l, _)) => len = l,
};
let mut reader = ByteReader::from(&buf[..len]);
// proccess frame packet
match buf[0] {
0x80..=0x8d => {
if let Ok(pk) = FramePacket::read(&mut reader) {
if let Err(_) = recv_q.insert(pk) {
continue;
}
let raw_packets = recv_q.flush();
for raw_pk in raw_packets {
let mut pk = ByteReader::from(&raw_pk[..]);
if let Ok(pk) = OnlinePacket::read(&mut pk) {
match pk {
OnlinePacket::ConnectedPing(pk) => {
rakrs_debug!(
true,
"[CLIENT] Received ConnectedPing from server!"
);
let response = ConnectedPong {
ping_time: pk.time,
pong_time: current_epoch() as i64,
};
if let Err(_) = send_q
.send_packet(
response.into(),
Reliability::Reliable,
true,
)
.await
{
rakrs_debug!(
true,
"[CLIENT] Failed to send pong packet!"
);
}
continue;
}
OnlinePacket::ConnectionAccept(pk) => {
// send new incoming connection
let new_incoming = NewConnection {
server_address: socket.peer_addr().unwrap(),
system_address: vec![
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
socket.peer_addr().unwrap(),
],
request_time: pk.request_time,
timestamp: pk.timestamp,
};
if let Err(_) = send_q
.send_packet(
new_incoming.into(),
Reliability::Reliable,
true,
)
.await
{
update_state!(
true,
shared_state,
HandshakeStatus::Failed
);
} else {
update_state!(
true,
shared_state,
HandshakeStatus::Completed
);
}
}
_ => {
rakrs_debug!(
true,
"[CLIENT] Received unknown packet from server!"
);
}
}
}
}
}
}
_ => {}
}
}
});
Self { status: state }
}
pub(crate) async fn send_connection_request(
send_q: &mut SendQueue,
id: i64,
) -> std::io::Result<()> {
let connect_request = ConnectionRequest {
time: current_epoch() as i64,
client_id: id,
security: false,
};
if let Err(_) = send_q
.send_packet(connect_request.into(), Reliability::Reliable, true)
.await
{
return Err(std::io::Error::new(
std::io::ErrorKind::Other,
"Failed to send ConnectionRequest!",
));
}
return Ok(());
}
}
impl Future for ClientHandshake {
type Output = HandshakeStatus;
fn poll(self: std::pin::Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
// see if we can finish
let mut state = self.status.lock().unwrap();
if state.done {
return Poll::Ready(state.status);
} else {
state.waker = Some(cx.waker().clone());
return Poll::Pending;
}
}
}