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11 changed files with 756 additions and 190 deletions

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[*.rs]
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.gitignore vendored
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/target
config.yaml
config.json

410
Cargo.lock generated
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@ -2,6 +2,15 @@
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version = "0.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "146c11bb1a02615db74680b32a68e2d61f553cc24c4eb5b4ca10311740e44172"
[[package]]
name = "windows_i686_msvc"
version = "0.36.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
[[package]]
name = "windows_x86_64_gnu"
version = "0.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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]]
name = "windows_x86_64_msvc"
version = "0.32.0"
@ -564,10 +853,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "504a2476202769977a040c6364301a3f65d0cc9e3fb08600b2bda150a0488316"
[[package]]
name = "yaml-rust"
version = "0.4.5"
name = "windows_x86_64_msvc"
version = "0.36.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
dependencies = [
"linked-hash-map",
]
checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"

View File

@ -1,6 +1,6 @@
[package]
name = "rustocat"
version = "0.0.3"
version = "0.1.0"
edition = "2021"
description = "Socat in rust with many less features and a configuration file"
license = "ISC"
@ -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 = "1.17.0", features = ["full"] }
tokio = { version = "1", features = ["full"] }
futures = "0.3.21"
serde = { version = "1.0.136", features = ["derive"] }
serde_json = "1.0.79"
serde_yaml = "0.8.23"
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.
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*

View File

@ -7,12 +7,13 @@ 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}.
```yaml
tcp:
- source: 0.0.0.0:2222
mappings:
- udp: false
source: 0.0.0.0:2222
targets: [127.0.0.1:22]
```
Currently only TCP is supported, UDP/Unix Socket support might be added later.
There is support for UDP and TCP sockets. Each socket can have multiple targets.
When multiple targets are set, it will randomly pick one of them.

View File

@ -1,5 +0,0 @@
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]

View File

@ -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>>>,
}

View File

@ -1,7 +1,9 @@
mod listener;
mod shutdown;
mod tcp;
mod udp;
use log::{debug, error, info, warn};
use serde::Deserialize;
use simple_error::bail;
use std::collections::{HashMap, HashSet};
@ -12,33 +14,35 @@ 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>,
source: String,
targets: Vec<String>,
}
#[derive(Debug, Deserialize)]
struct Config {
tcp: Vec<Target>,
// udp: Vec<Target>,
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",
@ -67,7 +71,23 @@ struct ActiveListener {
}
#[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())?;
@ -75,31 +95,38 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
let config = load_config().expect("config not found");
let mut required_listeners: HashSet<String> = HashSet::new();
for target in config.tcp {
required_listeners.insert(target.source.clone());
if let Some(listener) = listeners.get(&target.source) {
for target in config.mappings {
let mut source_str = "".to_owned();
if target.udp == None || target.udp == Some(false) {
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 targets = listener.targets.read().await;
for t in &target.targets {
if !targets.iter().any(|e| *e == *t) {
let targets = listener.targets.read().await;
for t in &target.targets {
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;
break;
}
}
if !invalid {
for t in targets.iter() {
if !target.targets.iter().any(|e| *e == *t) {
invalid = true;
break;
}
}
}
}
if invalid {
println!("Found invalid targets! Adjusting!");
warn!("Found invalid targets! Adjusting!");
let mut w = listener.targets.write().await;
*w = target.targets;
}
@ -112,18 +139,24 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
};
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(),
};
tokio::spawn(async move {
if let Err(err) = tcp::start_tcp_listener(l).await {
println!("listener error: {}", err);
if target.udp == None || target.udp == Some(false) {
if let Err(err) = tcp::start_tcp_listener(l).await {
error!("tcp listener error: {}", err);
}
} else {
if let Err(err) = udp::start_udp_listener(l).await {
error!("udp listener error: {}", err);
}
}
});
listeners.insert(target.source, listener);
listeners.insert(source_str, listener);
}
}
@ -135,13 +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!");
}
}

View File

@ -1,49 +1,62 @@
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<()>,
shutdown: bool,
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 {
Shutdown {
shutdown: false,
notify,
}
}
pub(crate) fn new() -> Shutdown {
let (sender, notify) = broadcast::channel(1);
Shutdown {
shutdown: false,
notify,
sender,
}
}
/// Returns `true` if the shutdown signal has been received.
// pub(crate) fn is_shutdown(&self) -> bool {
// self.shutdown
// }
pub(crate) fn shutdown(&mut self) {
if self.shutdown {
return;
}
let _ = self.sender.send(());
self.shutdown = true;
}
/// 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;
}
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,
}
}
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(),
}
}
}

View File

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

View File

@ -1,2 +1,224 @@
// For UDP to work, there is some magic required with matches the returning packets
// back to the original sender. Idk. how to do that right now, but maybe some day.
use std::collections::HashMap;
use std::sync::atomic::AtomicI32;
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(());
}