UDP seems to work now
This commit is contained in:
parent
7530ce3aae
commit
517889f875
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@ -2,6 +2,15 @@
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# It is not intended for manual editing.
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version = 3
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@ -14,18 +23,114 @@ version = "1.3.2"
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[[package]]
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@ -123,7 +228,7 @@ checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
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[[package]]
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@ -141,6 +246,30 @@ dependencies = [
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"libc",
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]
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[[package]]
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"winapi",
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[[package]]
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@ -158,10 +287,28 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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"cc",
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[[package]]
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name = "lock_api"
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@ -174,9 +321,9 @@ dependencies = [
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[[package]]
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@ -195,10 +342,29 @@ checksum = "57ee1c23c7c63b0c9250c339ffdc69255f110b298b901b9f6c82547b7b87caaf"
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"wasi 0.11.0+wasi-snapshot-preview1",
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"windows-sys 0.36.1",
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[[package]]
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[[package]]
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name = "num_cpus"
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[[package]]
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[[package]]
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@ -317,7 +483,10 @@ dependencies = [
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"chrono",
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"log",
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"rand",
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"serde",
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"serde_json",
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@ -338,6 +507,12 @@ version = "1.1.0"
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[[package]]
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@ -468,18 +663,84 @@ version = "1.0.4"
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|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
|
|
|
|||
11
Cargo.toml
11
Cargo.toml
|
|
@ -8,17 +8,20 @@ license = "ISC"
|
|||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
tokio = { version = "1.21.1", features = ["full"] }
|
||||
tokio = { version = "1", features = ["full"] }
|
||||
futures = "0.3.21"
|
||||
serde = { version = "1.0.136", features = ["derive"] }
|
||||
serde_json = "1.0.79"
|
||||
serde = { version = "1", features = ["derive"] }
|
||||
serde_json = "1"
|
||||
serde_yaml = "0.9.13"
|
||||
simple-error = "0.2.3"
|
||||
rand = "0.8.5"
|
||||
log = "0.4.17"
|
||||
fern = "0.6.1"
|
||||
chrono = "0.4.23"
|
||||
|
||||
[profile.release]
|
||||
opt-level = 3 # Optimize for size.
|
||||
lto = true # Enable Link Time Optimization
|
||||
codegen-units = 1 # Reduce number of codegen units to increase optimizations.
|
||||
panic = 'abort' # Abort on panic
|
||||
strip = true # Strip symbols from binary*
|
||||
strip = true # Strip symbols from binary*
|
||||
|
|
|
|||
|
|
@ -1,9 +1,9 @@
|
|||
use crate::shutdown::Shutdown;
|
||||
use crate::shutdown::ShutdownReceiver;
|
||||
use std::sync::Arc;
|
||||
use tokio::sync::RwLock;
|
||||
|
||||
pub(crate) struct Listener {
|
||||
pub(crate) shutdown: Shutdown,
|
||||
pub(crate) source: String,
|
||||
pub(crate) targets: Arc<RwLock<Vec<String>>>,
|
||||
pub(crate) shutdown: ShutdownReceiver,
|
||||
pub(crate) source: String,
|
||||
pub(crate) targets: Arc<RwLock<Vec<String>>>,
|
||||
}
|
||||
|
|
|
|||
52
src/main.rs
52
src/main.rs
|
|
@ -3,6 +3,7 @@ mod shutdown;
|
|||
mod tcp;
|
||||
mod udp;
|
||||
|
||||
use log::{debug, error, info, warn};
|
||||
use serde::Deserialize;
|
||||
use simple_error::bail;
|
||||
use std::collections::{HashMap, HashSet};
|
||||
|
|
@ -13,6 +14,8 @@ use std::sync::Arc;
|
|||
use tokio::signal::unix::{signal, SignalKind};
|
||||
use tokio::sync::{broadcast, RwLock};
|
||||
|
||||
pub type Result<T> = std::result::Result<T, Box<dyn Error>>;
|
||||
|
||||
#[derive(Debug, Deserialize)]
|
||||
struct Target {
|
||||
udp: Option<bool>,
|
||||
|
|
@ -25,21 +28,21 @@ struct Config {
|
|||
mappings: Vec<Target>,
|
||||
}
|
||||
|
||||
fn load_yaml(path: &Path) -> Result<Config, Box<dyn Error>> {
|
||||
fn load_yaml(path: &Path) -> Result<Config> {
|
||||
let file = File::open(path)?;
|
||||
let config: Config = serde_yaml::from_reader(file).expect("Failed to parse!"); //TODO: Print path
|
||||
|
||||
return Ok(config);
|
||||
}
|
||||
|
||||
fn load_json(path: &Path) -> Result<Config, Box<dyn Error>> {
|
||||
fn load_json(path: &Path) -> Result<Config> {
|
||||
let file = File::open(path)?;
|
||||
let config: Config = serde_json::from_reader(file).expect("Failed to parse!"); //TODO: Print path
|
||||
|
||||
return Ok(config);
|
||||
}
|
||||
|
||||
fn load_config() -> Result<Config, Box<dyn Error>> {
|
||||
fn load_config() -> Result<Config> {
|
||||
for path in [
|
||||
"config.yaml",
|
||||
"config.json",
|
||||
|
|
@ -63,13 +66,28 @@ fn load_config() -> Result<Config, Box<dyn Error>> {
|
|||
|
||||
// #[derive(Debug)]
|
||||
struct ActiveListener {
|
||||
udp: bool,
|
||||
notify_shutdown: broadcast::Sender<()>,
|
||||
targets: Arc<RwLock<Vec<String>>>,
|
||||
}
|
||||
|
||||
#[tokio::main]
|
||||
async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||
async fn main() -> Result<()> {
|
||||
fern::Dispatch::new()
|
||||
.format(|out, message, record| {
|
||||
out.finish(format_args!(
|
||||
"{}[{}][{}] {}",
|
||||
chrono::Local::now().format("[%Y-%m-%d][%H:%M:%S]"),
|
||||
record.target(),
|
||||
record.level(),
|
||||
message
|
||||
))
|
||||
})
|
||||
// Add blanket level filter -
|
||||
.level(log::LevelFilter::Info)
|
||||
.level_for("rustocat", log::LevelFilter::Trace)
|
||||
.chain(std::io::stdout())
|
||||
.apply()?;
|
||||
|
||||
let mut listeners: HashMap<String, ActiveListener> = HashMap::new();
|
||||
let mut sighup_stream = signal(SignalKind::hangup())?;
|
||||
|
||||
|
|
@ -108,7 +126,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
}
|
||||
|
||||
if invalid {
|
||||
println!("Found invalid targets! Adjusting!");
|
||||
warn!("Found invalid targets! Adjusting!");
|
||||
let mut w = listener.targets.write().await;
|
||||
*w = target.targets;
|
||||
}
|
||||
|
|
@ -118,11 +136,10 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
let listener = ActiveListener {
|
||||
notify_shutdown: notify_shutdown,
|
||||
targets: Arc::new(RwLock::new(target.targets)),
|
||||
udp: target.udp == None || target.udp == Some(false),
|
||||
};
|
||||
|
||||
let l = listener::Listener {
|
||||
shutdown: shutdown::Shutdown::new(listener.notify_shutdown.subscribe()),
|
||||
shutdown: shutdown::ShutdownReceiver::new(listener.notify_shutdown.subscribe()),
|
||||
source: target.source.clone(),
|
||||
targets: listener.targets.clone(),
|
||||
};
|
||||
|
|
@ -130,11 +147,11 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
tokio::spawn(async move {
|
||||
if target.udp == None || target.udp == Some(false) {
|
||||
if let Err(err) = tcp::start_tcp_listener(l).await {
|
||||
println!("tcp listener error: {}", err);
|
||||
error!("tcp listener error: {}", err);
|
||||
}
|
||||
} else {
|
||||
if let Err(err) = udp::start_udp_listener(l).await {
|
||||
println!("udp listener error: {}", err);
|
||||
error!("udp listener error: {}", err);
|
||||
}
|
||||
}
|
||||
});
|
||||
|
|
@ -151,13 +168,22 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
|
||||
for del_key in to_delete {
|
||||
if let Some(listener) = listeners.get(&del_key) {
|
||||
let _ = listener.notify_shutdown.send(()); //Errors are irrelevant here. I guess....
|
||||
println!("Removing listener!");
|
||||
let res = listener.notify_shutdown.send(()); //Errors are irrelevant here. I guess....
|
||||
match res {
|
||||
Ok(_) => {
|
||||
info!("Sent shutdown signal!");
|
||||
}
|
||||
Err(_) => {
|
||||
warn!("Failed to send shutdown signal!");
|
||||
}
|
||||
}
|
||||
|
||||
debug!("Removing listener!");
|
||||
listeners.remove(&del_key);
|
||||
}
|
||||
}
|
||||
|
||||
sighup_stream.recv().await;
|
||||
println!("Recevied SIGHUP!");
|
||||
info!("Recevied SIGHUP, reloading config!");
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,56 +1,60 @@
|
|||
use tokio::sync::broadcast;
|
||||
|
||||
/// Listens for the server shutdown signal.
|
||||
///
|
||||
/// Shutdown is signalled using a `broadcast::Receiver`. Only a single value is
|
||||
/// ever sent. Once a value has been sent via the broadcast channel, the server
|
||||
/// should shutdown.
|
||||
///
|
||||
/// The `Shutdown` struct listens for the signal and tracks that the signal has
|
||||
/// been received. Callers may query for whether the shutdown signal has been
|
||||
/// received or not.
|
||||
#[derive(Debug)]
|
||||
pub(crate) struct Shutdown {
|
||||
/// `true` if the shutdown signal has been received
|
||||
shutdown: bool,
|
||||
|
||||
/// The receive half of the channel used to listen for shutdown.
|
||||
notify: broadcast::Receiver<()>,
|
||||
sender: broadcast::Sender<()>,
|
||||
}
|
||||
|
||||
impl Shutdown {
|
||||
/// Create a new `Shutdown` backed by the given `broadcast::Receiver`.
|
||||
pub(crate) fn new(notify: broadcast::Receiver<()>) -> Shutdown {
|
||||
pub(crate) fn new() -> Shutdown {
|
||||
let (sender, notify) = broadcast::channel(1);
|
||||
Shutdown {
|
||||
shutdown: false,
|
||||
notify,
|
||||
sender,
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) fn shutdown(&mut self) {
|
||||
if self.shutdown {
|
||||
return;
|
||||
}
|
||||
let _ = self.sender.send(());
|
||||
self.shutdown = true;
|
||||
}
|
||||
|
||||
pub(crate) fn receiver(&self) -> ShutdownReceiver {
|
||||
ShutdownReceiver::new(self.notify.resubscribe())
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub(crate) struct ShutdownReceiver {
|
||||
shutdown: bool,
|
||||
notify: broadcast::Receiver<()>,
|
||||
}
|
||||
|
||||
impl ShutdownReceiver {
|
||||
pub(crate) fn new(notify: broadcast::Receiver<()>) -> ShutdownReceiver {
|
||||
ShutdownReceiver {
|
||||
shutdown: false,
|
||||
notify,
|
||||
}
|
||||
}
|
||||
|
||||
/// Returns `true` if the shutdown signal has been received.
|
||||
// pub(crate) fn is_shutdown(&self) -> bool {
|
||||
// self.shutdown
|
||||
// }
|
||||
|
||||
/// Receive the shutdown notice, waiting if necessary.
|
||||
pub(crate) async fn recv(&mut self) {
|
||||
// If the shutdown signal has already been received, then return
|
||||
// immediately.
|
||||
if self.shutdown {
|
||||
return;
|
||||
}
|
||||
|
||||
// Cannot receive a "lag error" as only one value is ever sent.
|
||||
let _ = self.notify.recv().await;
|
||||
|
||||
// Remember that the signal has been received.
|
||||
self.shutdown = true;
|
||||
}
|
||||
}
|
||||
|
||||
impl Clone for Shutdown {
|
||||
impl Clone for ShutdownReceiver {
|
||||
fn clone(&self) -> Self {
|
||||
Shutdown {
|
||||
ShutdownReceiver {
|
||||
shutdown: self.shutdown,
|
||||
notify: self.notify.resubscribe(),
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,4 +1,5 @@
|
|||
use crate::listener::Listener;
|
||||
use log::{info, trace, warn};
|
||||
use rand::seq::SliceRandom;
|
||||
use std::error::Error;
|
||||
use tokio::net::{TcpListener, TcpStream};
|
||||
|
|
@ -22,14 +23,14 @@ impl TcpHandler {
|
|||
pub(crate) async fn start_tcp_listener(
|
||||
mut listener_config: Listener,
|
||||
) -> Result<(), Box<dyn Error>> {
|
||||
println!("start listening on {}", &listener_config.source);
|
||||
info!("start listening on {}", &listener_config.source);
|
||||
let listener = TcpListener::bind(&listener_config.source).await?;
|
||||
|
||||
loop {
|
||||
let (next_socket, _) = tokio::select! {
|
||||
res = listener.accept() => res?,
|
||||
_ = listener_config.shutdown.recv() => {
|
||||
println!("Exiting listener!");
|
||||
info!("Exiting listener!");
|
||||
return Ok(());
|
||||
}
|
||||
};
|
||||
|
|
@ -38,7 +39,7 @@ pub(crate) async fn start_tcp_listener(
|
|||
let mut rng = rand::thread_rng();
|
||||
let selected_target = targets.choose(&mut rng).unwrap();
|
||||
|
||||
println!(
|
||||
trace!(
|
||||
"new connection from {} forwarding to {}",
|
||||
next_socket.peer_addr()?,
|
||||
&selected_target
|
||||
|
|
@ -51,7 +52,7 @@ pub(crate) async fn start_tcp_listener(
|
|||
tokio::spawn(async move {
|
||||
// Process the connection. If an error is encountered, log it.
|
||||
if let Err(err) = handler.run().await {
|
||||
println!("connection error {}", err);
|
||||
warn!("connection error {}", err);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
|
|
|||
305
src/udp.rs
305
src/udp.rs
|
|
@ -1,176 +1,225 @@
|
|||
use crate::listener::Listener;
|
||||
use crate::shutdown::Shutdown;
|
||||
use rand::seq::SliceRandom;
|
||||
use std::collections::HashMap;
|
||||
use std::error::Error;
|
||||
use std::sync::atomic::{AtomicI32, AtomicU64};
|
||||
use std::sync::Arc;
|
||||
|
||||
use log::{debug, error, info, trace};
|
||||
use rand::seq::SliceRandom;
|
||||
|
||||
use tokio::net::UdpSocket;
|
||||
use tokio::sync::broadcast;
|
||||
use tokio::sync::mpsc::{channel, Sender};
|
||||
use tokio::sync::Mutex;
|
||||
use tokio::time::Instant;
|
||||
|
||||
async fn create_dual_udpsocket(
|
||||
bind_addr: &String,
|
||||
) -> Result<(UdpSocket, UdpSocket), Box<dyn Error>> {
|
||||
let listener_std = std::net::UdpSocket::bind(bind_addr)?;
|
||||
let responder_std = listener_std.try_clone()?;
|
||||
let listener = UdpSocket::from_std(listener_std)?;
|
||||
let responder = UdpSocket::from_std(responder_std)?;
|
||||
use crate::listener::Listener;
|
||||
use crate::shutdown::{Shutdown, ShutdownReceiver};
|
||||
use crate::Result;
|
||||
|
||||
return Ok((listener, responder));
|
||||
const CONNECTION_TIMEOUT: i32 = 5;
|
||||
|
||||
#[derive(Clone)]
|
||||
struct UDPMultiSender {
|
||||
socket: Arc<UdpSocket>,
|
||||
}
|
||||
|
||||
fn get_udp_background_send(socket: UdpSocket, mut exit: Shutdown) -> Sender<(Vec<u8>, String)> {
|
||||
let (tx, mut rx) = channel::<(Vec<u8>, String)>(1);
|
||||
|
||||
tokio::spawn(async move {
|
||||
loop {
|
||||
let (buf, dest) = (tokio::select! {
|
||||
res = rx.recv() => Some(res.unwrap()),
|
||||
_ = exit.recv() => {
|
||||
println!("Exiting listener!");
|
||||
return;
|
||||
}
|
||||
})
|
||||
.unwrap();
|
||||
|
||||
let to_send = buf.as_slice();
|
||||
socket.send_to(to_send, &dest).await.expect(&format!(
|
||||
"Failed to forward response from upstream server to client {}",
|
||||
dest
|
||||
));
|
||||
}
|
||||
});
|
||||
|
||||
return tx;
|
||||
}
|
||||
|
||||
struct UdpHandler {
|
||||
last_packet: Arc<Mutex<Instant>>,
|
||||
kill: broadcast::Sender<()>,
|
||||
target: String,
|
||||
sender: Sender<(Vec<u8>, String)>,
|
||||
}
|
||||
|
||||
impl UdpHandler {
|
||||
async fn start(
|
||||
target: String,
|
||||
source: String,
|
||||
sender: Sender<(Vec<u8>, String)>,
|
||||
) -> Result<UdpHandler, Box<dyn Error>> {
|
||||
// Kill Channel
|
||||
let (tx, mut rx) = broadcast::channel::<()>(1);
|
||||
|
||||
let (listener, responder) = create_dual_udpsocket(&"0.0.0.0:0".to_owned()).await?;
|
||||
|
||||
let s = get_udp_background_send(responder, Shutdown::new(tx.subscribe()));
|
||||
|
||||
let last_packet = Arc::new(Mutex::new(Instant::now()));
|
||||
|
||||
let handler = UdpHandler {
|
||||
kill: tx,
|
||||
last_packet: last_packet.clone(),
|
||||
// source: source.clone(),
|
||||
target: target.clone(),
|
||||
sender: s,
|
||||
impl UDPMultiSender {
|
||||
fn new(socket: UdpSocket) -> Self {
|
||||
return Self {
|
||||
socket: Arc::new(socket),
|
||||
};
|
||||
|
||||
listener.connect(target).await?;
|
||||
tokio::spawn(async move {
|
||||
let mut buf = [0; 64 * 1024];
|
||||
loop {
|
||||
let (num_bytes, _) = tokio::select! {
|
||||
res = listener.recv_from(&mut buf) => res.unwrap(),
|
||||
_ = rx.recv() => {
|
||||
// FIXME: Source of memory leaks?
|
||||
return ;
|
||||
}
|
||||
};
|
||||
let mut n = last_packet.lock().await;
|
||||
*n = Instant::now();
|
||||
sender
|
||||
.send((buf[0..num_bytes].to_vec(), source.clone()))
|
||||
.await
|
||||
.expect(&format!("Failed to send answer to sender {}", source));
|
||||
}
|
||||
});
|
||||
return Ok(handler);
|
||||
}
|
||||
|
||||
async fn exit(&self) -> Result<(), Box<dyn Error>> {
|
||||
self.kill.send(())?;
|
||||
|
||||
Ok(())
|
||||
async fn send(&self, buf: &[u8]) -> Result<()> {
|
||||
self.socket.send(buf).await?;
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
async fn on_packet(&mut self, pkg: Vec<u8>) -> Result<(), Box<dyn Error>> {
|
||||
let mut n = self.last_packet.lock().await;
|
||||
*n = Instant::now();
|
||||
self.sender.send((pkg, self.target.clone())).await?;
|
||||
async fn send_to(&self, buf: &[u8], dest: &str) -> Result<()> {
|
||||
self.socket.send_to(buf, dest).await?;
|
||||
return Ok(());
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) async fn start_udp_listener(
|
||||
mut listener_config: Listener,
|
||||
) -> Result<(), Box<dyn Error>> {
|
||||
println!("start listening on {}", &listener_config.source);
|
||||
let (listener, responder) =
|
||||
create_dual_udpsocket(&listener_config.source)
|
||||
.await
|
||||
.expect(&format!(
|
||||
"Failed to clone primary listening address socket {}",
|
||||
&listener_config.source,
|
||||
));
|
||||
async fn splitted_udp_socket(bind_addr: &str) -> Result<(UdpSocket, UDPMultiSender)> {
|
||||
let listener_std = std::net::UdpSocket::bind(bind_addr)?;
|
||||
let responder_std = listener_std.try_clone()?;
|
||||
listener_std.set_nonblocking(true)?;
|
||||
responder_std.set_nonblocking(true)?;
|
||||
let listener = UdpSocket::from_std(listener_std)?;
|
||||
let responder = UDPMultiSender::new(UdpSocket::from_std(responder_std)?);
|
||||
|
||||
let sender = get_udp_background_send(responder, listener_config.shutdown.clone());
|
||||
return Ok((listener, responder));
|
||||
}
|
||||
|
||||
let mut connections: HashMap<String, UdpHandler> = HashMap::new();
|
||||
struct UDPChannel {
|
||||
last_packet: Arc<AtomicI32>,
|
||||
sender: UDPMultiSender,
|
||||
shutdown: Shutdown,
|
||||
from: String,
|
||||
upstream: String,
|
||||
}
|
||||
|
||||
impl UDPChannel {
|
||||
async fn start(
|
||||
upstream: String,
|
||||
responder: UDPMultiSender,
|
||||
source_addr: String,
|
||||
) -> Result<Self> {
|
||||
let (upstream_listener, upstream_responder) = splitted_udp_socket("0.0.0.0:0").await?;
|
||||
upstream_listener.connect(upstream.clone()).await?;
|
||||
|
||||
let shutdown = Shutdown::new();
|
||||
let mut shutdown_receiver = shutdown.receiver();
|
||||
|
||||
let channel = Self {
|
||||
last_packet: Arc::new(AtomicI32::new(CONNECTION_TIMEOUT)),
|
||||
sender: upstream_responder,
|
||||
shutdown,
|
||||
from: source_addr.clone(),
|
||||
upstream: upstream.clone(),
|
||||
};
|
||||
|
||||
let last_packet = channel.last_packet.clone();
|
||||
|
||||
tokio::spawn(async move {
|
||||
let mut buf = [0; 64 * 1024];
|
||||
loop {
|
||||
let num_bytes = tokio::select! {
|
||||
res = upstream_listener.recv(&mut buf) => res.unwrap(),
|
||||
_ = shutdown_receiver.recv() => {
|
||||
info!("Exiting");
|
||||
return;
|
||||
}
|
||||
};
|
||||
|
||||
trace!("[{}] <- [{}] ...", source_addr, upstream);
|
||||
last_packet.store(CONNECTION_TIMEOUT, std::sync::atomic::Ordering::Relaxed);
|
||||
|
||||
match responder.send_to(&buf[..num_bytes], &source_addr).await {
|
||||
Ok(_) => {}
|
||||
Err(e) => {
|
||||
error!("Failed to send packet: {}", e);
|
||||
}
|
||||
};
|
||||
|
||||
trace!("[{}] <- [{}] ---", source_addr, upstream);
|
||||
}
|
||||
});
|
||||
|
||||
return Ok(channel);
|
||||
}
|
||||
|
||||
async fn close(&mut self) {
|
||||
self.shutdown.shutdown();
|
||||
debug!("Closing connection from {}", self.from);
|
||||
}
|
||||
|
||||
async fn handle(&self, data: &[u8]) {
|
||||
trace!("[{}] -> [{}] ...", self.from, self.upstream);
|
||||
self.last_packet
|
||||
.store(CONNECTION_TIMEOUT, std::sync::atomic::Ordering::Relaxed);
|
||||
match self.sender.send(data).await {
|
||||
Ok(_) => {}
|
||||
Err(e) => {
|
||||
error!("Failed to send packet: {}", e);
|
||||
}
|
||||
}
|
||||
trace!("[{}] -> [{}] ---", self.from, self.upstream);
|
||||
}
|
||||
}
|
||||
|
||||
fn start_stale_check(
|
||||
connections: Arc<Mutex<HashMap<String, UDPChannel>>>,
|
||||
mut shutdown: ShutdownReceiver,
|
||||
) {
|
||||
tokio::spawn(async move {
|
||||
let mut interval = tokio::time::interval(std::time::Duration::from_secs(1));
|
||||
loop {
|
||||
tokio::select! {
|
||||
_ = interval.tick() => {}
|
||||
_ = shutdown.recv() => {
|
||||
info!("Exiting listener!");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
trace!("Checking for stale connections");
|
||||
trace!("Waiting for connections lock");
|
||||
let mut connections = connections.lock().await;
|
||||
trace!("Got connections lock");
|
||||
let mut to_remove: Vec<String> = Vec::new();
|
||||
for (source_addr, channel) in connections.iter() {
|
||||
let last = channel
|
||||
.last_packet
|
||||
.fetch_sub(1, std::sync::atomic::Ordering::Relaxed);
|
||||
|
||||
if last <= 0 {
|
||||
to_remove.push(source_addr.clone());
|
||||
}
|
||||
}
|
||||
|
||||
for source_addr in to_remove {
|
||||
debug!("Closing connection from {}", source_addr);
|
||||
let mut channel = connections.remove(&source_addr).unwrap();
|
||||
channel.close().await;
|
||||
}
|
||||
trace!("Checking for stale connections - done");
|
||||
drop(connections);
|
||||
}
|
||||
|
||||
info!("Exiting stale check");
|
||||
});
|
||||
}
|
||||
|
||||
pub(crate) async fn start_udp_listener(mut listener_config: Listener) -> Result<()> {
|
||||
info!("start listening on {}", &listener_config.source);
|
||||
let (listener, responder) = splitted_udp_socket(&listener_config.source).await?;
|
||||
let connections = Arc::new(Mutex::new(HashMap::<String, UDPChannel>::new()));
|
||||
|
||||
start_stale_check(connections.clone(), listener_config.shutdown.clone());
|
||||
|
||||
let mut buf = [0; 64 * 1024];
|
||||
loop {
|
||||
let mut buf = vec![0; 1024 * 64];
|
||||
trace!("Waiting for packet or shutdown");
|
||||
let (num_bytes, src_addr) = tokio::select! {
|
||||
res = listener.recv_from(&mut buf) => res?,
|
||||
_ = listener_config.shutdown.recv() => {
|
||||
println!("Exiting listener!");
|
||||
info!("Exiting listener!");
|
||||
break;
|
||||
}
|
||||
};
|
||||
|
||||
let addr = src_addr.to_string();
|
||||
let handler_opt = connections.get_mut(&addr);
|
||||
let vec = buf[0..num_bytes].to_vec();
|
||||
let data = buf[0..num_bytes].to_vec();
|
||||
let source_addr = src_addr.to_string();
|
||||
|
||||
let mut connections = connections.lock().await;
|
||||
|
||||
let handler_opt = connections.get_mut(&source_addr);
|
||||
let handler = match handler_opt {
|
||||
Some(handler) => handler,
|
||||
None => {
|
||||
debug!("New connection from {}", source_addr);
|
||||
let targets = listener_config.targets.read().await;
|
||||
let selected_target = {
|
||||
let upstream = {
|
||||
let mut rng = rand::thread_rng();
|
||||
targets.choose(&mut rng).unwrap()
|
||||
};
|
||||
|
||||
let handler =
|
||||
UdpHandler::start(selected_target.clone(), addr.clone(), sender.clone())
|
||||
UDPChannel::start(upstream.to_string(), responder.clone(), source_addr.clone())
|
||||
.await?;
|
||||
connections.insert(addr.clone(), handler);
|
||||
|
||||
connections.get_mut(&addr).unwrap()
|
||||
connections.insert(source_addr.clone(), handler);
|
||||
connections.get_mut(&source_addr).unwrap()
|
||||
}
|
||||
};
|
||||
|
||||
match handler.on_packet(vec).await {
|
||||
Ok(_) => (),
|
||||
Err(err) => {
|
||||
println!("Failed to forward request from client to server {}", err);
|
||||
return Ok(());
|
||||
}
|
||||
}
|
||||
handler.handle(&data).await;
|
||||
trace!("Handled packet");
|
||||
drop(connections);
|
||||
}
|
||||
|
||||
for handler in connections.values() {
|
||||
handler.exit().await?;
|
||||
for (_, handler) in connections.lock().await.iter_mut() {
|
||||
handler.close().await;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
return Ok(());
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue