411 lines
9.3 KiB
Rust
411 lines
9.3 KiB
Rust
use std::{
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str::FromStr,
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};
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use fltk::{
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app,
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button::Button,
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enums::CallbackTrigger,
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frame::Frame,
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group::Flex,
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input::*,
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prelude::*,
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window::Window
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};
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use rand::{
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Rng,
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SeedableRng,
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};
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use structopt::StructOpt;
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use tokio::runtime::Runtime;
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use quic_demo::{
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client_proxy::*,
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prelude::*,
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protocol::PeerId,
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};
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#[derive (Debug, StructOpt)]
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struct Opt {
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#[structopt (long)]
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window_title: Option <String>,
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#[structopt (long)]
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relay_addr: Option <String>,
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#[structopt (long)]
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client_id: Option <PeerId>,
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#[structopt (long)]
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cert_url: Option <String>,
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}
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#[derive (Clone, Copy)]
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enum Message {
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OpenPort (usize),
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ClosePort (usize),
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AddPort,
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}
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struct GuiClient <'a> {
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rt: &'a Runtime,
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frame_status: Frame,
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ports: Vec <Port>,
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but_add_port: Button,
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}
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struct Port {
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gui: GuiPort,
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forwarding_instance: Option <ForwardingInstance>,
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}
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impl Port {
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pub fn open_port (
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&mut self,
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rt: &Runtime,
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connection_p2_p3: quinn::Connection,
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) -> anyhow::Result <()>
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{
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let params = self.gui.get_params ()?;
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let _guard = rt.enter ();
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let forwarding_instance = rt.block_on (ForwardingInstance::new (
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connection_p2_p3,
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params,
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))?;
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self.gui.input_client_port.set_value (&forwarding_instance.local_port ().to_string ());
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self.forwarding_instance.replace (forwarding_instance);
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self.gui.set_forwarding (true);
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Ok (())
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}
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}
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struct GuiPort {
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row: fltk::group::Flex,
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input_client_port: Input,
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input_server_id: Input,
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input_server_port: Input,
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but_open: Button,
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but_close: Button,
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}
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impl GuiClient <'_> {
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pub fn open_port (
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&mut self,
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connection_p2_p3: quinn::Connection,
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port_idx: usize,
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) -> anyhow::Result <()>
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{
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self.ports [port_idx].open_port (&self.rt, connection_p2_p3)?;
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self.sync_status ();
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Ok (())
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}
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pub fn close_port (&mut self, port_idx: usize) -> anyhow::Result <()> {
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if let Some (old_instance) = self.ports [port_idx].forwarding_instance.take () {
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self.rt.block_on (async {
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old_instance.close ()
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.await
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.context ("closing ForwardingInstance")?;
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Ok::<_, anyhow::Error> (())
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})?;
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}
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self.ports [port_idx].gui.set_forwarding (false);
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self.sync_status ();
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Ok (())
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}
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fn open_ports (&self) -> usize {
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self.ports.iter ()
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.map (|x| if x.forwarding_instance.is_some () { 1 } else { 0 })
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.sum ()
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}
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pub fn sync_status (&mut self) {
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let open_ports = self.open_ports ();
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self.frame_status.set_label (&format! ("Forwarding {} ports", open_ports));
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}
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pub fn add_port (
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&mut self,
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ports_col: &mut Flex,
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fltk_tx: fltk::app::Sender <Message>
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) {
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const MAX_PORTS: usize = 15;
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if self.ports.len () >= MAX_PORTS {
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return;
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}
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let mut gui = GuiPort::new (fltk_tx, self.ports.len ());
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ports_col.add (&gui.row);
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ports_col.set_size (&mut gui.row, 30);
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let port = Port {
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gui,
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forwarding_instance: None,
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};
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self.ports.push (port);
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if self.ports.len () >= MAX_PORTS {
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self.but_add_port.deactivate ();
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}
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}
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}
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fn main () -> anyhow::Result <()> {
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tracing_subscriber::fmt::init ();
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let rt = Runtime::new ()?;
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let opt = Opt::from_args ();
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let (fltk_tx, fltk_rx) = app::channel::<Message> ();
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let app = app::App::default ();
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let window_title = opt.window_title.clone ().unwrap_or_else (|| "PTTH client proxy".to_string ());
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let mut wind = Window::new (100, 100, 800, 600, None)
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.with_label (&window_title);
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wind.make_resizable (true);
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let mut col = Flex::default ().column ().size_of_parent ();
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let mut frame_status = Frame::default ();
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col.set_size (&mut frame_status, 30);
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{
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let mut row = Flex::default ().row ();
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let mut l = Frame::default ().with_label ("Server ID");
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row.set_size (&mut l, 120);
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let mut l = Frame::default ().with_label ("Server port");
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row.set_size (&mut l, 80);
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let mut l = Frame::default ().with_label ("Local port");
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row.set_size (&mut l, 80);
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row.end ();
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col.set_size (&mut row, 30);
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}
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let mut ports_col = Flex::default ().column ();
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ports_col.end ();
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let mut but_add_port = Button::default ().with_label ("+");
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but_add_port.set_trigger (CallbackTrigger::Release);
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but_add_port.emit (fltk_tx, Message::AddPort);
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col.set_size (&mut but_add_port, 30);
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col.end ();
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let relay_addr = opt.relay_addr.as_ref ()
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.map (|s| &s[..])
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.unwrap_or ("127.0.0.1:30380")
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.parse ()
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.context ("relay_addr should be like 127.0.0.1:30380")?;
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let mut gui_client = GuiClient {
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rt: &rt,
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frame_status,
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ports: Default::default (),
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but_add_port,
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};
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gui_client.add_port (&mut ports_col, fltk_tx);
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ports_col.recalc ();
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gui_client.sync_status ();
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wind.end ();
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wind.show ();
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let connection_p2_p3 = rt.block_on (async move {
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let server_cert = match opt.cert_url.as_ref () {
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Some (url) => reqwest::get (url).await?.bytes ().await?,
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None => tokio::fs::read ("ptth_quic_output/quic_server.crt").await.context ("can't read quic_server.crt from disk")?.into (),
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};
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let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&server_cert])?;
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trace! ("Connecting to relay server");
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let client_id = opt.client_id.unwrap_or_else (|| "bogus_client".to_string ());
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let quinn::NewConnection {
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connection,
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..
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} = protocol::p2_connect_to_p3 (&endpoint, &relay_addr, &client_id).await
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.context ("P2 can't connect to P3")?;
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Ok::<_, anyhow::Error> (connection)
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})?;
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while app.wait () {
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match fltk_rx.recv () {
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Some (Message::OpenPort (port_idx)) => {
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if let Err (e) = gui_client.open_port (connection_p2_p3.clone (), port_idx)
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{
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error! ("{:?}", e);
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}
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},
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Some (Message::ClosePort (port_idx)) => {
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gui_client.close_port (port_idx)?;
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},
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Some (Message::AddPort) => {
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gui_client.add_port (&mut ports_col, fltk_tx);
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ports_col.recalc ();
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ports_col.redraw ();
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},
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None => (),
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}
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}
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Ok (())
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}
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fn set_active <W: WidgetExt> (w: &mut W, b: bool) {
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if b {
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w.activate ();
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}
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else {
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w.deactivate ();
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}
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}
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impl GuiPort {
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fn new (fltk_tx: fltk::app::Sender <Message>, port_idx: usize) -> Self {
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let mut row = Flex::default ().row ();
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let mut input_server_id = Input::default ();
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let mut input_server_port = Input::default ();
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let mut input_client_port = Input::default ();
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let mut but_open = Button::default ().with_label ("Open");
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let mut but_close = Button::default ().with_label ("Close");
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row.set_size (&mut input_server_id, 120);
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row.set_size (&mut input_server_port, 80);
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row.set_size (&mut input_client_port, 80);
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row.set_size (&mut but_open, 80);
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row.set_size (&mut but_close, 80);
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input_client_port.set_value ("");
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input_client_port.set_readonly (true);
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input_server_id.set_value ("bogus_server");
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input_server_port.set_value ("5900");
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but_open.set_trigger (CallbackTrigger::Release);
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but_open.emit (fltk_tx, Message::OpenPort (port_idx));
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but_close.set_trigger (CallbackTrigger::Release);
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but_close.emit (fltk_tx, Message::ClosePort (port_idx));
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row.end ();
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let mut output = Self {
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row,
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input_client_port,
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input_server_id,
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input_server_port,
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but_open,
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but_close,
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};
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output.set_forwarding (false);
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output
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}
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fn get_params (&self) -> anyhow::Result <ForwardingParams>
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{
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let server_tcp_port = u16::from_str (&self.input_server_port.value ())?;
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let server_id = self.input_server_id.value ();
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let client_tcp_port = PortInfo {
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server_id: &server_id,
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server_tcp_port,
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}.random_eph_port ();
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Ok (ForwardingParams {
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client_tcp_port,
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server_id,
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server_tcp_port,
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})
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}
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fn set_forwarding (&mut self, x: bool) {
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set_active (&mut self.input_client_port, x);
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set_active (&mut self.input_server_id, !x);
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set_active (&mut self.input_server_port, !x);
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set_active (&mut self.but_open, !x);
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set_active (&mut self.but_close, x);
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self.but_open.set (x);
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self.but_close.set (!x);
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}
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}
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// This can collide, but who cares
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// It's not secure or anything - It's just supposed to pick a port somewhat
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// deterministically based on the server and relay info.
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#[derive (serde::Serialize)]
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struct PortInfo <'a> {
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// relay_addr: SocketAddr,
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server_id: &'a str,
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server_tcp_port: u16
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}
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impl PortInfo <'_> {
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// https://en.wikipedia.org/wiki/TCP_ports#Dynamic,_private_or_ephemeral_ports
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fn random_eph_port (&self) -> u16
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{
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let seed = blake3::hash (&rmp_serde::to_vec (self).expect ("Can't hash PortInfo - impossible error"));
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let mut rng = rand_chacha::ChaCha20Rng::from_seed (*seed.as_bytes ());
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let tcp_eph_range = 49152..=65535;
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rng.gen_range (tcp_eph_range)
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}
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}
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#[cfg (test)]
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mod test {
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use blake3::Hasher;
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use super::*;
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#[test]
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fn prng () {
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let hasher = Hasher::default ();
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let seed = hasher.finalize ();
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let mut rng = rand_chacha::ChaCha20Rng::from_seed (*seed.as_bytes ());
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let tcp_eph_range = 49152..=65535;
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let port = rng.gen_range (tcp_eph_range);
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assert_eq! (port, 49408);
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for (input, expected) in vec! [
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(("127.0.0.1:4000", "bogus_server", 22), 51168),
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// The relay address is explicitly excluded from the eph port
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// computation in case I want to support connecting to a server
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// across multiple relays
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(("127.0.0.1:30380", "bogus_server", 22), 51168),
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(("127.0.0.1:4000", "real_server", 22), 53873),
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(("127.0.0.1:4000", "bogus_server", 5900), 53844),
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] {
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let (_relay_addr, server_id, server_tcp_port) = input;
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let input = PortInfo {
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server_id,
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server_tcp_port,
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};
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let actual = input.random_eph_port ();
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assert_eq! (expected, actual);
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}
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}
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}
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