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|
use futures::{StreamExt, channel::mpsc::UnboundedSender};
use std::{
net::{IpAddr, Ipv4Addr, Ipv6Addr},
sync::Arc,
};
use talpid_routing::RouteManagerHandle;
use talpid_types::{ErrorExt, net::Connectivity};
pub type Result<T> = std::result::Result<T, Error>;
#[derive(thiserror::Error, Debug)]
pub enum Error {
#[error("The route manager returned an error")]
RouteManagerError(#[source] talpid_routing::Error),
}
pub struct MonitorHandle {
route_manager: RouteManagerHandle,
fwmark: Option<u32>,
_notify_tx: Arc<UnboundedSender<Connectivity>>,
}
/// A non-local IPv4 address.
const PUBLIC_INTERNET_ADDRESS_V4: IpAddr = IpAddr::V4(Ipv4Addr::new(193, 138, 218, 78));
/// A non-local IPv6 address.
const PUBLIC_INTERNET_ADDRESS_V6: IpAddr =
IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
impl MonitorHandle {
pub async fn connectivity(&self) -> Connectivity {
check_connectivity(&self.route_manager, self.fwmark).await
}
}
pub async fn spawn_monitor(
notify_tx: UnboundedSender<Connectivity>,
route_manager: RouteManagerHandle,
fwmark: Option<u32>,
) -> Result<MonitorHandle> {
let mut connectivity = check_connectivity(&route_manager, fwmark).await;
let mut listener = route_manager
.change_listener()
.await
.map_err(Error::RouteManagerError)?;
let notify_tx = Arc::new(notify_tx);
let sender = Arc::downgrade(¬ify_tx);
let monitor_handle = MonitorHandle {
route_manager: route_manager.clone(),
fwmark,
_notify_tx: notify_tx,
};
tokio::spawn(async move {
while let Some(_event) = listener.next().await {
match sender.upgrade() {
Some(sender) => {
let new_connectivity = check_connectivity(&route_manager, fwmark).await;
if new_connectivity != connectivity {
connectivity = new_connectivity;
let _ = sender.unbounded_send(connectivity);
}
}
None => return,
}
}
});
Ok(monitor_handle)
}
async fn check_connectivity(handle: &RouteManagerHandle, fwmark: Option<u32>) -> Connectivity {
let route_exists = |destination| async move {
handle
.get_destination_route(destination, fwmark)
.await
.map(|route| route.is_some())
};
match (
route_exists(PUBLIC_INTERNET_ADDRESS_V4).await,
route_exists(PUBLIC_INTERNET_ADDRESS_V6).await,
) {
(Ok(ipv4), Ok(ipv6)) => Connectivity::new(ipv4, ipv6),
// If we fail to retrieve the IPv4 route, always assume we're connected
(Err(err), _) => {
log::error!(
"Failed to verify offline state: {}. Presuming connectivity",
err
);
Connectivity::PresumeOnline
}
// Errors for IPv6 likely mean it's disabled, so assume it's unavailable
(Ok(ipv4), Err(err)) => {
log::trace!(
"{}",
err.display_chain_with_msg(
"Failed to infer offline state for IPv6. Assuming it's unavailable"
)
);
Connectivity::new(ipv4, false)
}
}
}
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