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//! Incoming data stream cell handlers, shared by the relay and onion service implementations.
use tor_cell::relaycell::RelayCmd;
use tor_cell::restricted_msg;
use crate::stream::cmdcheck::{AnyCmdChecker, CmdChecker, StreamStatus};
use crate::{Error, Result};
/// A `CmdChecker` that enforces invariants for inbound data streams.
#[derive(Debug, Default)]
pub(crate) struct InboundDataCmdChecker;
restricted_msg! {
/// An allowable incoming message on an incoming data stream.
enum IncomingDataStreamMsg:RelayMsg {
// SENDME is handled by the reactor.
Data, End,
}
}
impl CmdChecker for InboundDataCmdChecker {
fn check_msg(&mut self, msg: &tor_cell::relaycell::UnparsedRelayMsg) -> Result<StreamStatus> {
use StreamStatus::*;
match msg.cmd() {
RelayCmd::DATA => Ok(Open),
RelayCmd::END => Ok(Closed),
_ => Err(Error::StreamProto(format!(
"Unexpected {} on an incoming data stream!",
msg.cmd()
))),
}
}
fn consume_checked_msg(&mut self, msg: tor_cell::relaycell::UnparsedRelayMsg) -> Result<()> {
let _ = msg
.decode::<IncomingDataStreamMsg>()
.map_err(|err| Error::from_bytes_err(err, "cell on half-closed stream"))?;
Ok(())
}
}
impl InboundDataCmdChecker {
/// Return a new boxed `DataCmdChecker` in a state suitable for a
/// connection where an initial CONNECTED cell is not expected.
///
/// This is used by hidden services, exit relays, and directory servers
/// to accept streams.
pub(crate) fn new_connected() -> AnyCmdChecker {
Box::new(Self)
}
}
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