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Add transparent tcp proxy on linux

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Σrebe - Romain GERARD 2023-12-01 20:20:33 +01:00
parent fb8742ef14
commit 33ca736a73
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GPG key ID: 7A42B4B97E0332F4
5 changed files with 77 additions and 28 deletions
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81
src/main.rs
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@ -28,7 +28,7 @@ use tokio_rustls::rustls::{Certificate, PrivateKey, ServerName};
use tracing::{error, info, Level};
use crate::LocalProtocol::ReverseTcp;
use crate::tunnel::to_host_port;
use tracing_subscriber::EnvFilter;
use url::{Host, Url};
@ -56,6 +56,7 @@ struct Client {
/// 'udp://1212:1.1.1.1:53?timeout_sec=10' timeout_sec on udp force close the tunnel after 10sec. Set it to 0 to disable the timeout [default: 30]
/// 'socks5://[::1]:1212' => listen locally with socks5 on port 1212 and forward dynamically requested tunnel
/// 'stdio://google.com:443' => listen for data from stdio, mainly for `ssh -o ProxyCommand="wstunnel client -L stdio://%h:%p ws://localhost:8080" my-server`
/// 'tproxy+tcp://[::1]:1212 => listen locally on tcp on port 1212 as a *transparent proxy* and forward dynamically requested tunnel (linux only requires sudo/CAP_NET_ADMIN)
#[arg(short='L', long, value_name = "{tcp,udp,socks5,stdio}://[BIND:]PORT:HOST:PORT", value_parser = parse_tunnel_arg, verbatim_doc_comment)]
local_to_remote: Vec<LocalToRemote>,
@ -172,6 +173,7 @@ enum LocalProtocol {
Udp { timeout: Option<Duration> },
Stdio,
Socks5,
TProxyTcp,
ReverseTcp,
ReverseUdp { timeout: Option<Duration> },
}
@ -315,6 +317,16 @@ fn parse_tunnel_arg(arg: &str) -> Result<LocalToRemote, io::Error> {
remote: (dest_host, dest_port),
})
}
"tproxy+t" => {
let (local_bind, remaining) = parse_local_bind(&arg["tproxy+tcp://".len()..])?;
let x = format!("0.0.0.0:0?{}", remaining);
let (dest_host, dest_port, _options) = parse_tunnel_dest(&x)?;
Ok(LocalToRemote {
local_protocol: LocalProtocol::TProxyTcp,
local: local_bind,
remote: (dest_host, dest_port),
})
}
_ => Err(Error::new(
ErrorKind::InvalidInput,
format!("Invalid local protocol for tunnel {}", arg),
@ -551,7 +563,7 @@ async fn main() {
let client_config = client_config.clone();
match &tunnel.local_protocol {
LocalProtocol::Tcp => {
tunnel.local_protocol = ReverseTcp;
tunnel.local_protocol = LocalProtocol::ReverseTcp;
tokio::spawn(async move {
let remote = tunnel.remote.clone();
let cfg = client_config.clone();
@ -592,7 +604,7 @@ async fn main() {
match &tunnel.local_protocol {
LocalProtocol::Tcp => {
let remote = tunnel.remote.clone();
let server = tcp::run_server(tunnel.local)
let server = tcp::run_server(tunnel.local, false)
.await
.unwrap_or_else(|err| panic!("Cannot start TCP server on {}: {}", tunnel.local, err))
.map_err(anyhow::Error::new)
@ -604,6 +616,28 @@ async fn main() {
}
});
}
#[cfg(target_os = "linux")]
LocalProtocol::TProxyTcp => {
let server = tcp::run_server(tunnel.local, true)
.await
.unwrap_or_else(|err| panic!("Cannot start TProxy server on {}: {}", tunnel.local, err))
.map_err(anyhow::Error::new)
.map_ok(move |stream| {
// In TProxy mode local destination is the final ip:port destination
let dest = to_host_port(stream.local_addr().unwrap());
(stream.into_split(), dest)
});
tokio::spawn(async move {
if let Err(err) = tunnel::client::run_tunnel(client_config, tunnel, server).await {
error!("{:?}", err);
}
});
}
#[cfg(not(target_os = "linux"))]
LocalProtocol::TProxyTcp => {
panic!("Transparent proxy is not available for non Linux platform")
}
LocalProtocol::Udp { timeout } => {
let remote = tunnel.remote.clone();
let server = udp::run_server(tunnel.local, *timeout)
@ -630,28 +664,27 @@ async fn main() {
}
});
}
#[cfg(target_family = "unix")]
LocalProtocol::Stdio => {
#[cfg(target_family = "unix")]
{
let server = stdio::run_server().await.unwrap_or_else(|err| {
panic!("Cannot start STDIO server: {}", err);
});
tokio::spawn(async move {
if let Err(err) = tunnel::client::run_tunnel(
client_config,
tunnel.clone(),
stream::once(async move { Ok((server, tunnel.remote)) }),
)
.await
{
error!("{:?}", err);
}
});
}
#[cfg(not(target_family = "unix"))]
{
panic!("stdio is not implemented for non unix platform")
}
let server = stdio::run_server().await.unwrap_or_else(|err| {
panic!("Cannot start STDIO server: {}", err);
});
tokio::spawn(async move {
if let Err(err) = tunnel::client::run_tunnel(
client_config,
tunnel.clone(),
stream::once(async move { Ok((server, tunnel.remote)) }),
)
.await
{
error!("{:?}", err);
}
});
}
#[cfg(not(target_family = "unix"))]
LocalProtocol::Stdio => {
panic!("stdio is not implemented for non unix platform")
}
LocalProtocol::ReverseTcp => {}
LocalProtocol::ReverseUdp { .. } => {}