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Ops:main
Ops:udp
Ops:0.1.13
Ops:0.1.12
Ops:0.1.11
Ops:0.1.10
Ops:v0.1.0
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compare: Ops:f7af1ac02045b4be638ae652a5e5b3be29a00146
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Ops:0.1.12
Ops:0.1.11
Ops:0.1.10
Ops:v0.1.0

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[*.rs]
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/target /target
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"wasm-bindgen-macro-support",
]
[[package]]
name = "wasm-bindgen-macro-support"
version = "0.2.84"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2aff81306fcac3c7515ad4e177f521b5c9a15f2b08f4e32d823066102f35a5f6"
dependencies = [
"proc-macro2",
"quote",
"syn",
"wasm-bindgen-backend",
"wasm-bindgen-shared",
]
[[package]]
name = "wasm-bindgen-shared"
version = "0.2.84"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0046fef7e28c3804e5e38bfa31ea2a0f73905319b677e57ebe37e49358989b5d"
[[package]] [[package]]
name = "winapi" name = "winapi"
version = "0.3.9" version = "0.3.9"
@ -757,15 +514,6 @@ version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6" checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
[[package]]
name = "winapi-util"
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
dependencies = [
"winapi",
]
[[package]] [[package]]
name = "winapi-x86_64-pc-windows-gnu" name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0" version = "0.4.0"
@ -778,24 +526,11 @@ version = "0.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3df6e476185f92a12c072be4a189a0210dcdcf512a1891d6dff9edb874deadc6" checksum = "3df6e476185f92a12c072be4a189a0210dcdcf512a1891d6dff9edb874deadc6"
dependencies = [ dependencies = [
"windows_aarch64_msvc 0.32.0", "windows_aarch64_msvc",
"windows_i686_gnu 0.32.0", "windows_i686_gnu",
"windows_i686_msvc 0.32.0", "windows_i686_msvc",
"windows_x86_64_gnu 0.32.0", "windows_x86_64_gnu",
"windows_x86_64_msvc 0.32.0", "windows_x86_64_msvc",
]
[[package]]
name = "windows-sys"
version = "0.36.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
dependencies = [
"windows_aarch64_msvc 0.36.1",
"windows_i686_gnu 0.36.1",
"windows_i686_msvc 0.36.1",
"windows_x86_64_gnu 0.36.1",
"windows_x86_64_msvc 0.36.1",
] ]
[[package]] [[package]]
@ -804,48 +539,24 @@ version = "0.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d8e92753b1c443191654ec532f14c199742964a061be25d77d7a96f09db20bf5" checksum = "d8e92753b1c443191654ec532f14c199742964a061be25d77d7a96f09db20bf5"
[[package]]
name = "windows_aarch64_msvc"
version = "0.36.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
[[package]] [[package]]
name = "windows_i686_gnu" name = "windows_i686_gnu"
version = "0.32.0" version = "0.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6a711c68811799e017b6038e0922cb27a5e2f43a2ddb609fe0b6f3eeda9de615" checksum = "6a711c68811799e017b6038e0922cb27a5e2f43a2ddb609fe0b6f3eeda9de615"
[[package]]
name = "windows_i686_gnu"
version = "0.36.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
[[package]] [[package]]
name = "windows_i686_msvc" name = "windows_i686_msvc"
version = "0.32.0" version = "0.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "146c11bb1a02615db74680b32a68e2d61f553cc24c4eb5b4ca10311740e44172" checksum = "146c11bb1a02615db74680b32a68e2d61f553cc24c4eb5b4ca10311740e44172"
[[package]]
name = "windows_i686_msvc"
version = "0.36.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
[[package]] [[package]]
name = "windows_x86_64_gnu" name = "windows_x86_64_gnu"
version = "0.32.0" version = "0.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c912b12f7454c6620635bbff3450962753834be2a594819bd5e945af18ec64bc" checksum = "c912b12f7454c6620635bbff3450962753834be2a594819bd5e945af18ec64bc"
[[package]]
name = "windows_x86_64_gnu"
version = "0.36.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
[[package]] [[package]]
name = "windows_x86_64_msvc" name = "windows_x86_64_msvc"
version = "0.32.0" version = "0.32.0"
@ -853,7 +564,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "504a2476202769977a040c6364301a3f65d0cc9e3fb08600b2bda150a0488316" checksum = "504a2476202769977a040c6364301a3f65d0cc9e3fb08600b2bda150a0488316"
[[package]] [[package]]
name = "windows_x86_64_msvc" name = "yaml-rust"
version = "0.36.1" version = "0.4.5"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680" checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
dependencies = [
"linked-hash-map",
]

15
Cargo.toml
View File

@ -1,6 +1,6 @@
[package] [package]
name = "rustocat" name = "rustocat"
version = "0.1.0" version = "0.0.3"
edition = "2021" edition = "2021"
description = "Socat in rust with many less features and a configuration file" description = "Socat in rust with many less features and a configuration file"
license = "ISC" license = "ISC"
@ -8,19 +8,16 @@ license = "ISC"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies] [dependencies]
tokio = { version = "1", features = ["full"] } tokio = { version = "1.17.0", features = ["full"] }
futures = "0.3.21" futures = "0.3.21"
serde = { version = "1", features = ["derive"] } serde = { version = "1.0.136", features = ["derive"] }
serde_json = "1" serde_json = "1.0.79"
serde_yaml = "0.9.13" serde_yaml = "0.8.23"
simple-error = "0.2.3" simple-error = "0.2.3"
rand = "0.8.5" rand = "0.8.5"
log = "0.4.17"
fern = "0.6.1"
chrono = "0.4.23"
[profile.release] [profile.release]
opt-level = 3 # Optimize for size. opt-level = 3 # Optimize for size.
lto = true # Enable Link Time Optimization lto = true # Enable Link Time Optimization
codegen-units = 1 # Reduce number of codegen units to increase optimizations. codegen-units = 1 # Reduce number of codegen units to increase optimizations.
panic = 'abort' # Abort on panic panic = 'abort' # Abort on panic

7
README.md
View File

@ -7,13 +7,12 @@ Rustocat is a simple socat alternative with way less features, but it has a conf
Configs can be either yaml or json and can be located in /etc/rustocat.{yaml|json} or in the current working directory as config.{yaml|json}. Configs can be either yaml or json and can be located in /etc/rustocat.{yaml|json} or in the current working directory as config.{yaml|json}.
```yaml ```yaml
mappings: tcp:
- udp: false - source: 0.0.0.0:2222
source: 0.0.0.0:2222
targets: [127.0.0.1:22] targets: [127.0.0.1:22]
``` ```
There is support for UDP and TCP sockets. Each socket can have multiple targets. Currently only TCP is supported, UDP/Unix Socket support might be added later.
When multiple targets are set, it will randomly pick one of them. When multiple targets are set, it will randomly pick one of them.

5
config.yaml Normal file
View File

@ -0,0 +1,5 @@
tcp:
- source: 127.0.0.1:4422
targets: [127.0.0.1:22, fury.infra.stamm.me:22]
- source: 127.0.0.1:4423
targets: [127.0.0.1:22, fury.infra.stamm.me:22]

8
src/listener.rs
View File

@ -1,9 +1,9 @@
use crate::shutdown::ShutdownReceiver; use crate::shutdown::Shutdown;
use std::sync::Arc; use std::sync::Arc;
use tokio::sync::RwLock; use tokio::sync::RwLock;
pub(crate) struct Listener { pub(crate) struct Listener {
pub(crate) shutdown: ShutdownReceiver, pub(crate) shutdown: Shutdown,
pub(crate) source: String, pub(crate) source: String,
pub(crate) targets: Arc<RwLock<Vec<String>>>, pub(crate) targets: Arc<RwLock<Vec<String>>>,
} }

102
src/main.rs
View File

@ -1,9 +1,7 @@
mod listener; mod listener;
mod shutdown; mod shutdown;
mod tcp; mod tcp;
mod udp;
use log::{debug, error, info, warn};
use serde::Deserialize; use serde::Deserialize;
use simple_error::bail; use simple_error::bail;
use std::collections::{HashMap, HashSet}; use std::collections::{HashMap, HashSet};
@ -14,35 +12,33 @@ use std::sync::Arc;
use tokio::signal::unix::{signal, SignalKind}; use tokio::signal::unix::{signal, SignalKind};
use tokio::sync::{broadcast, RwLock}; use tokio::sync::{broadcast, RwLock};
pub type Result<T> = std::result::Result<T, Box<dyn Error>>;
#[derive(Debug, Deserialize)] #[derive(Debug, Deserialize)]
struct Target { struct Target {
udp: Option<bool>,
source: String, source: String,
targets: Vec<String>, targets: Vec<String>,
} }
#[derive(Debug, Deserialize)] #[derive(Debug, Deserialize)]
struct Config { struct Config {
mappings: Vec<Target>, tcp: Vec<Target>,
// udp: Vec<Target>,
} }
fn load_yaml(path: &Path) -> Result<Config> { fn load_yaml(path: &Path) -> Result<Config, Box<dyn Error>> {
let file = File::open(path)?; let file = File::open(path)?;
let config: Config = serde_yaml::from_reader(file).expect("Failed to parse!"); //TODO: Print path let config: Config = serde_yaml::from_reader(file).expect("Failed to parse!"); //TODO: Print path
return Ok(config); return Ok(config);
} }
fn load_json(path: &Path) -> Result<Config> { fn load_json(path: &Path) -> Result<Config, Box<dyn Error>> {
let file = File::open(path)?; let file = File::open(path)?;
let config: Config = serde_json::from_reader(file).expect("Failed to parse!"); //TODO: Print path let config: Config = serde_json::from_reader(file).expect("Failed to parse!"); //TODO: Print path
return Ok(config); return Ok(config);
} }
fn load_config() -> Result<Config> { fn load_config() -> Result<Config, Box<dyn Error>> {
for path in [ for path in [
"config.yaml", "config.yaml",
"config.json", "config.json",
@ -71,23 +67,7 @@ struct ActiveListener {
} }
#[tokio::main] #[tokio::main]
async fn main() -> Result<()> { async fn main() -> Result<(), Box<dyn std::error::Error>> {
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 listeners: HashMap<String, ActiveListener> = HashMap::new();
let mut sighup_stream = signal(SignalKind::hangup())?; let mut sighup_stream = signal(SignalKind::hangup())?;
@ -95,38 +75,31 @@ async fn main() -> Result<()> {
let config = load_config().expect("config not found"); let config = load_config().expect("config not found");
let mut required_listeners: HashSet<String> = HashSet::new(); let mut required_listeners: HashSet<String> = HashSet::new();
for target in config.mappings { for target in config.tcp {
let mut source_str = "".to_owned(); required_listeners.insert(target.source.clone());
if target.udp == None || target.udp == Some(false) { if let Some(listener) = listeners.get(&target.source) {
source_str.push_str("udp:");
} else {
source_str.push_str("tcp:");
}
source_str.push_str(&target.source);
required_listeners.insert(source_str.clone());
if let Some(listener) = listeners.get(&source_str) {
let mut invalid = false; let mut invalid = false;
{
let targets = listener.targets.read().await; let targets = listener.targets.read().await;
for t in &target.targets { for t in &target.targets {
if !targets.iter().any(|e| *e == *t) { if !targets.iter().any(|e| *e == *t) {
invalid = true;
break;
}
}
if !invalid {
for t in targets.iter() {
if !target.targets.iter().any(|e| *e == *t) {
invalid = true; invalid = true;
break; break;
} }
} }
if !invalid {
for t in targets.iter() {
if !target.targets.iter().any(|e| *e == *t) {
invalid = true;
break;
}
}
}
} }
if invalid { if invalid {
warn!("Found invalid targets! Adjusting!"); println!("Found invalid targets! Adjusting!");
let mut w = listener.targets.write().await; let mut w = listener.targets.write().await;
*w = target.targets; *w = target.targets;
} }
@ -139,24 +112,18 @@ async fn main() -> Result<()> {
}; };
let l = listener::Listener { let l = listener::Listener {
shutdown: shutdown::ShutdownReceiver::new(listener.notify_shutdown.subscribe()), shutdown: shutdown::Shutdown::new(listener.notify_shutdown.subscribe()),
source: target.source.clone(), source: target.source.clone(),
targets: listener.targets.clone(), targets: listener.targets.clone(),
}; };
tokio::spawn(async move { tokio::spawn(async move {
if target.udp == None || target.udp == Some(false) { if let Err(err) = tcp::start_tcp_listener(l).await {
if let Err(err) = tcp::start_tcp_listener(l).await { println!("listener error: {}", err);
error!("tcp listener error: {}", err);
}
} else {
if let Err(err) = udp::start_udp_listener(l).await {
error!("udp listener error: {}", err);
}
} }
}); });
listeners.insert(source_str, listener); listeners.insert(target.source, listener);
} }
} }
@ -168,22 +135,13 @@ async fn main() -> Result<()> {
for del_key in to_delete { for del_key in to_delete {
if let Some(listener) = listeners.get(&del_key) { if let Some(listener) = listeners.get(&del_key) {
let res = listener.notify_shutdown.send(()); //Errors are irrelevant here. I guess.... let _ = listener.notify_shutdown.send(()); //Errors are irrelevant here. I guess....
match res { println!("Removing listener!");
Ok(_) => {
info!("Sent shutdown signal!");
}
Err(_) => {
warn!("Failed to send shutdown signal!");
}
}
debug!("Removing listener!");
listeners.remove(&del_key); listeners.remove(&del_key);
} }
} }
sighup_stream.recv().await; sighup_stream.recv().await;
info!("Recevied SIGHUP, reloading config!"); println!("Recevied SIGHUP!");
} }
} }

93
src/shutdown.rs
View File

@ -1,62 +1,49 @@
use tokio::sync::broadcast; 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 { pub(crate) struct Shutdown {
shutdown: bool, /// `true` if the shutdown signal has been received
notify: broadcast::Receiver<()>, shutdown: bool,
sender: broadcast::Sender<()>,
/// The receive half of the channel used to listen for shutdown.
notify: broadcast::Receiver<()>,
} }
impl Shutdown { impl Shutdown {
pub(crate) fn new() -> Shutdown { /// Create a new `Shutdown` backed by the given `broadcast::Receiver`.
let (sender, notify) = broadcast::channel(1); pub(crate) fn new(notify: broadcast::Receiver<()>) -> Shutdown {
Shutdown { Shutdown {
shutdown: false, shutdown: false,
notify, notify,
sender, }
} }
}
pub(crate) fn shutdown(&mut self) { /// Returns `true` if the shutdown signal has been received.
if self.shutdown { // pub(crate) fn is_shutdown(&self) -> bool {
return; // self.shutdown
} // }
let _ = self.sender.send(());
self.shutdown = true;
}
pub(crate) fn receiver(&self) -> ShutdownReceiver { /// Receive the shutdown notice, waiting if necessary.
ShutdownReceiver::new(self.notify.resubscribe()) pub(crate) async fn recv(&mut self) {
} // If the shutdown signal has already been received, then return
} // immediately.
if self.shutdown {
#[derive(Debug)] return;
pub(crate) struct ShutdownReceiver { }
shutdown: bool,
notify: broadcast::Receiver<()>, // Cannot receive a "lag error" as only one value is ever sent.
} let _ = self.notify.recv().await;
impl ShutdownReceiver { // Remember that the signal has been received.
pub(crate) fn new(notify: broadcast::Receiver<()>) -> ShutdownReceiver { self.shutdown = true;
ShutdownReceiver { }
shutdown: false,
notify,
}
}
pub(crate) async fn recv(&mut self) {
if self.shutdown {
return;
}
let _ = self.notify.recv().await;
self.shutdown = true;
}
}
impl Clone for ShutdownReceiver {
fn clone(&self) -> Self {
ShutdownReceiver {
shutdown: self.shutdown,
notify: self.notify.resubscribe(),
}
}
} }

75
src/tcp.rs
View File

@ -1,59 +1,58 @@
use crate::listener::Listener; use crate::listener::Listener;
use log::{info, trace, warn};
use rand::seq::SliceRandom; use rand::seq::SliceRandom;
use std::error::Error; use std::error::Error;
use tokio::net::{TcpListener, TcpStream}; use tokio::net::{TcpListener, TcpStream};
#[derive(Debug)] #[derive(Debug)]
struct TcpHandler { struct TcpHandler {
stream: TcpStream, stream: TcpStream,
target: String, target: String,
} }
impl TcpHandler { impl TcpHandler {
async fn run(&mut self) -> Result<(), Box<dyn Error>> { async fn run(&mut self) -> Result<(), Box<dyn Error>> {
let mut stream = TcpStream::connect(&self.target).await?; let mut stream = TcpStream::connect(&self.target).await?;
tokio::io::copy_bidirectional(&mut self.stream, &mut stream).await?; tokio::io::copy_bidirectional(&mut self.stream, &mut stream).await?;
return Ok(()); return Ok(());
} }
} }
pub(crate) async fn start_tcp_listener( pub(crate) async fn start_tcp_listener(
mut listener_config: Listener, mut listener_config: Listener,
) -> Result<(), Box<dyn Error>> { ) -> Result<(), Box<dyn Error>> {
info!("start listening on {}", &listener_config.source); println!("start listening on {}", &listener_config.source);
let listener = TcpListener::bind(&listener_config.source).await?; let listener = TcpListener::bind(&listener_config.source).await?;
loop { loop {
let (next_socket, _) = tokio::select! { let (next_socket, _) = tokio::select! {
res = listener.accept() => res?, res = listener.accept() => res?,
_ = listener_config.shutdown.recv() => { _ = listener_config.shutdown.recv() => {
info!("Exiting listener!"); println!("Exiting listener!");
return Ok(()); return Ok(());
} }
}; };
let targets = listener_config.targets.read().await; let targets = listener_config.targets.read().await;
let mut rng = rand::thread_rng(); let mut rng = rand::thread_rng();
let selected_target = targets.choose(&mut rng).unwrap(); let selected_target = targets.choose(&mut rng).unwrap();
trace!( println!(
"new connection from {} forwarding to {}", "new connection from {} forwarding to {}",
next_socket.peer_addr()?, next_socket.peer_addr()?,
&selected_target &selected_target
); );
let mut handler = TcpHandler { let mut handler = TcpHandler {
stream: next_socket, stream: next_socket,
target: selected_target.clone(), target: selected_target.clone(),
}; };
tokio::spawn(async move { tokio::spawn(async move {
// Process the connection. If an error is encountered, log it. // Process the connection. If an error is encountered, log it.
if let Err(err) = handler.run().await { if let Err(err) = handler.run().await {
warn!("connection error {}", err); println!("connection error {}", err);
} }
}); });
} }
} }

226
src/udp.rs
View File

@ -1,224 +1,2 @@
use std::collections::HashMap; // For UDP to work, there is some magic required with matches the returning packets
use std::sync::atomic::AtomicI32; // back to the original sender. Idk. how to do that right now, but maybe some day.
use std::sync::Arc;
use log::{debug, error, info, trace};
use rand::seq::SliceRandom;
use tokio::net::UdpSocket;
use tokio::sync::Mutex;
use crate::listener::Listener;
use crate::shutdown::{Shutdown, ShutdownReceiver};
use crate::Result;
const CONNECTION_TIMEOUT: i32 = 5;
#[derive(Clone)]
struct UDPMultiSender {
socket: Arc<UdpSocket>,
}
impl UDPMultiSender {
fn new(socket: UdpSocket) -> Self {
return Self {
socket: Arc::new(socket),
};
}
async fn send(&self, buf: &[u8]) -> Result<()> {
self.socket.send(buf).await?;
return Ok(());
}
async fn send_to(&self, buf: &[u8], dest: &str) -> Result<()> {
self.socket.send_to(buf, dest).await?;
return Ok(());
}
}
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)?);
return Ok((listener, responder));
}
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());
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() => {
info!("Exiting listener!");
break;
}
};
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 upstream = {
let mut rng = rand::thread_rng();
targets.choose(&mut rng).unwrap()
};
let handler =
UDPChannel::start(upstream.to_string(), responder.clone(), source_addr.clone())
.await?;
connections.insert(source_addr.clone(), handler);
connections.get_mut(&source_addr).unwrap()
}
};
handler.handle(&data).await;
trace!("Handled packet");
drop(connections);
}
for (_, handler) in connections.lock().await.iter_mut() {
handler.close().await;
}
return Ok(());
}