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|
#[cfg(target_os = "android")]
use crate::{DaemonCommand, DaemonEventSender};
use futures::{
channel::{mpsc, oneshot},
Future, Stream, StreamExt,
};
use mullvad_api::{
availability::ApiAvailabilityHandle,
proxy::{ApiConnectionMode, ProxyConfig},
ApiEndpointUpdateCallback,
};
use mullvad_relay_selector::RelaySelector;
use std::{
net::SocketAddr,
path::PathBuf,
pin::Pin,
sync::{Arc, Mutex, Weak},
task::Poll,
};
#[cfg(target_os = "android")]
use talpid_core::mpsc::Sender;
use talpid_core::tunnel_state_machine::TunnelCommand;
use talpid_types::{
net::{openvpn::ProxySettings, AllowedEndpoint, Endpoint, TransportProtocol},
ErrorExt,
};
/// A stream that returns the next API connection mode to use for reaching the API.
///
/// When `mullvad-api` fails to contact the API, it requests a new connection mode.
/// The API can be connected to either directly (i.e., [`ApiConnectionMode::Direct`])
/// or from a bridge ([`ApiConnectionMode::Proxied`]).
///
/// * Every 3rd attempt returns [`ApiConnectionMode::Direct`].
/// * Any other attempt returns a configuration for the bridge that is closest to the selected relay
/// location and matches all bridge constraints.
/// * When no matching bridge is found, e.g. if the selected hosting providers don't match any
/// bridge, [`ApiConnectionMode::Direct`] is returned.
pub struct ApiConnectionModeProvider {
cache_dir: PathBuf,
relay_selector: RelaySelector,
retry_attempt: u32,
current_task: Option<Pin<Box<dyn Future<Output = ApiConnectionMode> + Send>>>,
}
impl Stream for ApiConnectionModeProvider {
type Item = ApiConnectionMode;
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> Poll<Option<Self::Item>> {
// Poll the current task
if let Some(task) = self.current_task.as_mut() {
return match task.as_mut().poll(cx) {
Poll::Ready(mode) => {
self.current_task = None;
Poll::Ready(Some(mode))
}
Poll::Pending => Poll::Pending,
};
}
// Create a new task.
let config = if Self::should_use_bridge(self.retry_attempt) {
self.relay_selector
.get_bridge_forced()
.map(|settings| match settings {
ProxySettings::Shadowsocks(ss_settings) => {
ApiConnectionMode::Proxied(ProxyConfig::Shadowsocks(ss_settings))
}
_ => {
log::error!("Received unexpected proxy settings type");
ApiConnectionMode::Direct
}
})
.unwrap_or(ApiConnectionMode::Direct)
} else {
ApiConnectionMode::Direct
};
self.retry_attempt = self.retry_attempt.wrapping_add(1);
let cache_dir = self.cache_dir.clone();
self.current_task = Some(Box::pin(async move {
if let Err(error) = config.save(&cache_dir).await {
log::debug!(
"{}",
error.display_chain_with_msg("Failed to save API endpoint")
);
}
config
}));
self.poll_next(cx)
}
}
impl ApiConnectionModeProvider {
pub(crate) fn new(cache_dir: PathBuf, relay_selector: RelaySelector) -> Self {
Self {
cache_dir,
relay_selector,
retry_attempt: 0,
current_task: None,
}
}
fn should_use_bridge(retry_attempt: u32) -> bool {
retry_attempt % 3 > 0
}
}
/// Notifies the tunnel state machine that the API (real or proxied) endpoint has
/// changed. [ApiEndpointUpdaterHandle::callback()] creates a callback that may
/// be passed to the `mullvad-api` runtime.
pub(super) struct ApiEndpointUpdaterHandle {
tunnel_cmd_tx: Arc<Mutex<Option<Weak<mpsc::UnboundedSender<TunnelCommand>>>>>,
}
impl ApiEndpointUpdaterHandle {
pub fn new() -> Self {
Self {
tunnel_cmd_tx: Arc::new(Mutex::new(None)),
}
}
pub fn set_tunnel_command_tx(&self, tunnel_cmd_tx: Weak<mpsc::UnboundedSender<TunnelCommand>>) {
*self.tunnel_cmd_tx.lock().unwrap() = Some(tunnel_cmd_tx);
}
pub fn callback(&self) -> impl ApiEndpointUpdateCallback {
let tunnel_tx = self.tunnel_cmd_tx.clone();
move |address: SocketAddr| {
let inner_tx = tunnel_tx.clone();
async move {
let tunnel_tx = if let Some(Some(tunnel_tx)) = { inner_tx.lock().unwrap().as_ref() }
.map(|tx: &Weak<mpsc::UnboundedSender<TunnelCommand>>| tx.upgrade())
{
tunnel_tx
} else {
log::error!("Rejecting allowed endpoint: Tunnel state machine is not running");
return false;
};
let (result_tx, result_rx) = oneshot::channel();
let _ = tunnel_tx.unbounded_send(TunnelCommand::AllowEndpoint(
get_allowed_endpoint(address),
result_tx,
));
// Wait for the firewall policy to be updated.
let _ = result_rx.await;
log::debug!("API endpoint: {}", address);
true
}
}
}
}
pub(super) fn get_allowed_endpoint(api_address: SocketAddr) -> AllowedEndpoint {
let endpoint = Endpoint::from_socket_address(api_address, TransportProtocol::Tcp);
#[cfg(windows)]
let daemon_exe = std::env::current_exe().expect("failed to obtain executable path");
#[cfg(windows)]
let clients = vec![
daemon_exe
.parent()
.expect("missing executable parent directory")
.join("mullvad-problem-report.exe"),
daemon_exe,
];
AllowedEndpoint {
#[cfg(windows)]
clients,
endpoint,
}
}
pub(crate) fn forward_offline_state(
api_availability: ApiAvailabilityHandle,
mut offline_state_rx: mpsc::UnboundedReceiver<bool>,
) {
tokio::spawn(async move {
let initial_state = offline_state_rx
.next()
.await
.expect("missing initial offline state");
api_availability.set_offline(initial_state);
while let Some(is_offline) = offline_state_rx.next().await {
api_availability.set_offline(is_offline);
}
});
}
#[cfg(target_os = "android")]
pub(crate) fn create_bypass_tx(
event_sender: &DaemonEventSender,
) -> Option<mpsc::Sender<mullvad_api::SocketBypassRequest>> {
let (bypass_tx, mut bypass_rx) = mpsc::channel(1);
let daemon_tx = event_sender.to_specialized_sender();
tokio::spawn(async move {
while let Some((raw_fd, done_tx)) = bypass_rx.next().await {
if let Err(_) = daemon_tx.send(DaemonCommand::BypassSocket(raw_fd, done_tx)) {
log::error!("Can't send socket bypass request to daemon");
break;
}
}
});
Some(bypass_tx)
}
|
