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forward_lwip.rs
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forward_lwip.rs
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use std::net::{Ipv6Addr, SocketAddr};
use futures::{SinkExt, StreamExt};
use netstack_smoltcp::{
net::{get_default_if_name, if_nametoindex},
utils::init_default_interface,
};
use netstack_lwip::*;
use structopt::StructOpt;
use tokio::net::{TcpSocket, TcpStream};
use tracing::{error, info, warn};
// to run this example, you should set the policy routing **after the start of the main program**
//
// linux:
// with bind device:
// `curl 1.1.1.1 --interface utun8`
// with default route:
// `bash scripts/route-linux.sh add`
// `curl 1.1.1.1`
// with single route:
// `ip rule add to 1.1.1.1 table 200`
// `ip route add default dev utun8 table 200`
// `curl 1.1.1.1`
//
// macos:
// with default route:
// `bash scripts/route-macos.sh add`
// `curl 1.1.1.1`
//
// windows:
// with default route:
// tun2 set default route automatically, won't set agian
// # `powershell.exe scripts/route-windows.ps1 add`
// `curl 1.1.1.1`
//
// currently, the example only supports the TCP stream, and the UDP packet will be dropped.
#[derive(Debug, StructOpt)]
#[structopt(name = "forward", about = "Simply forward tun tcp/udp traffic.")]
struct Opt {
/// Default binding interface, default by guessed.
/// Specify but doesn't exist, no device is bound.
#[structopt(short = "i", long = "interface")]
interface: Option<String>,
/// Tracing subscriber log level.
#[structopt(long = "log-level", default_value = "debug")]
log_level: tracing::Level,
/// Tokio current-thread runtime, default to multi-thread.
#[structopt(long = "current-thread")]
current_thread: bool,
/// Tokio task spawn_local, default to spwan.
#[structopt(long = "local-task")]
local_task: bool,
}
fn main() {
let opt = Opt::from_args();
let rt = if opt.current_thread {
tokio::runtime::Builder::new_current_thread()
} else {
tokio::runtime::Builder::new_multi_thread()
}
.enable_all()
.build()
.unwrap();
rt.block_on(main_exec(opt));
}
async fn main_exec(opt: Opt) {
macro_rules! tokio_spawn {
($fut: expr) => {
if opt.local_task {
tokio::task::spawn_local($fut)
} else {
tokio::task::spawn($fut)
}
};
}
tracing::subscriber::set_global_default(
tracing_subscriber::FmtSubscriber::builder()
.with_max_level(opt.log_level)
.finish(),
)
.unwrap();
let mut cfg = tun::Configuration::default();
#[cfg(target_os = "windows")]
cfg.platform_config(|config| {
config.device_guid(Some(9099482345783245345345_u128));
});
cfg.layer(tun::Layer::L3);
let fd = -1;
let dst = "10.10.2.1";
let addr = "10.10.2.1";
let _addr_v6: Ipv6Addr = "2:2:1:1443:0:0:0:400".parse().unwrap();
let netmask = "255.255.255.0";
let name = "utun64";
if fd >= 0 {
cfg.raw_fd(fd);
} else {
cfg.tun_name(name)
.address(addr)
.destination(dst)
.mtu(tun::DEFAULT_MTU);
#[cfg(not(any(
target_arch = "mips",
target_arch = "mips64",
target_arch = "mipsel",
target_arch = "mipsel64",
)))]
{
cfg.netmask(netmask);
}
cfg.up();
}
let device = tun::create_as_async(&cfg).unwrap();
let if_index = if_nametoindex(name);
#[cfg(target_os = "linux")]
netstack_smoltcp::utils::add_ipv6_addr(if_index, addr_v6, 64).await;
#[cfg(target_os = "macos")]
netstack_smoltcp::utils::add_ipv6_addr(name, addr_v6, 64).await;
let interface;
#[cfg(debug_assertions)]
{
// the tun device is not handled yet
init_default_interface(net_route::Handle::new().unwrap(), Some(if_index))
.await
.unwrap();
interface = opt.interface.unwrap_or(get_default_if_name().unwrap());
info!(
"re detect interface: {}, default if: {:?}",
&interface,
get_default_if_name()
);
}
let _opt: Opt;
let _table = 1989;
#[cfg(target_os = "linux")]
{
opt = watfaq_tun::Opt {
table,
if_index: if_nametoindex(name),
preset: vec![],
gateway_ipv4: Some(addr.parse().unwrap()),
gateway_ipv6: Some(addr_v6),
};
}
#[cfg(target_os = "macos")]
{
opt = watfaq_tun::Opt {
if_index: if_nametoindex(name),
preset: vec![],
gateway_ipv4: Some(addr.parse().unwrap()),
gateway_ipv6: Some(addr_v6),
};
}
#[cfg(target_os = "linux")]
watfaq_tun::platform::add_rules(table, true, true, true)
.await
.unwrap();
// watfaq_tun::add_route(&opt).await.unwrap();
let (stack, tcp_listener, udp_socket) =
netstack_lwip::NetStack::with_buffer_size(512, 256).unwrap();
let framed = device.into_framed();
let (mut tun_sink, mut tun_stream) = framed.split();
let (mut stack_sink, mut stack_stream) = stack.split();
let mut futs = vec![];
// Reads packet from stack and sends to TUN.
futs.push(tokio_spawn!(async move {
while let Some(pkt) = stack_stream.next().await {
if let Ok(pkt) = pkt {
match tun_sink.send(pkt).await {
Ok(_) => {}
Err(e) => warn!("failed to send packet to TUN, err: {:?}", e),
}
}
}
}));
// Reads packet from TUN and sends to stack.
futs.push(tokio_spawn!(async move {
while let Some(pkt) = tun_stream.next().await {
if let Ok(pkt) = pkt {
match stack_sink.send(pkt).await {
Ok(_) => {}
Err(e) => warn!("failed to send packet to stack, err: {:?}", e),
};
}
}
}));
// Extracts TCP connections from stack and sends them to the dispatcher.
futs.push(tokio_spawn!({
let default_if = interface.clone();
async move {
handle_inbound_stream(tcp_listener, default_if).await;
}
}));
// Receive and send UDP packets between netstack and NAT manager. The NAT
// manager would maintain UDP sessions and send them to the dispatcher.
futs.push(tokio_spawn!(async move {
handle_inbound_datagram(udp_socket, interface).await;
}));
futures::future::join_all(futs)
.await
.iter()
.for_each(|res| {
if let Err(e) = res {
error!("error: {:?}", e);
}
});
}
/// simply forward tcp stream
async fn handle_inbound_stream(mut tcp_listener: TcpListener, interface: String) {
while let Some((mut stream, local, remote)) = tcp_listener.next().await {
let interface = interface.clone();
tokio::spawn(async move {
info!("new tcp connection: {:?} => {:?}", local, remote);
#[cfg(target_os = "linux")]
netstack_smoltcp::dump::resolve(local);
match new_tcp_stream(remote, &interface).await {
// match new_tcp_stream(remote, &interface).await {
Ok(mut remote_stream) => {
// pipe between two tcp stream
match tokio::io::copy_bidirectional(&mut stream, &mut remote_stream).await {
Ok(_) => {}
Err(e) => warn!(
"failed to copy tcp stream {:?}=>{:?}, err: {:?}",
local, remote, e
),
}
}
Err(e) => warn!(
"failed to new tcp stream {:?}=>{:?}, err: {:?}",
local, remote, e
),
}
});
}
}
/// simply forward udp datagram
async fn handle_inbound_datagram(_udp_socket: Box<UdpSocket>, _interface: String) {}
async fn new_tcp_stream<'a>(addr: SocketAddr, iface: &str) -> std::io::Result<TcpStream> {
use socket2_ext::{AddressBinding, BindDeviceOption};
let socket = if addr.is_ipv4() {
let socket = socket2::Socket::new(socket2::Domain::IPV4, socket2::Type::STREAM, None)?;
socket.bind_to_device(BindDeviceOption::v4(iface))?;
socket
} else {
let socket = socket2::Socket::new(socket2::Domain::IPV6, socket2::Type::STREAM, None)?;
socket.bind_to_device(BindDeviceOption::v6(iface))?;
socket
};
socket.set_keepalive(true)?;
socket.set_nodelay(true)?;
socket.set_nonblocking(true)?;
let stream = TcpSocket::from_std_stream(socket.into())
.connect(addr)
.await?;
Ok(stream)
}