composed: the bind-first accept — the listener on a listen resource
Lands the composed accept (ADR-007 variant 2 / ADR-008): the BIND accept whose listener lives on an alktunnels 0.2.0 bind-first listen resource, at the graduation's vanilla fidelity. - `composed::bindfirst_accept` — the BindAcceptFactory: opens the listen channel (reply#1 advertises the open-op reply's real `bound`, the 0.8.0 reply projection — no expected-addr stand-in), inserts the minted `listen` token into the correlation registry, and returns the accept future parked on the token's oneshot. - `composed::register_forwarded_serving` — the forwarded-op serving half on the SOCKS5 producer's connection: the shared handler correlates by token and owns the middle pump (either-EOF completion; a three-party per-direction shutdown cascade would deadlock). - The Sync-bound wrinkle: `SyncHalves`/`OwnedWrite` (mutex Sync-proof, no unsafe) over the forwarded halves; the owner (`ForwardedOwner`, the TunnelListener) rides inside the write payload — dropping the handle drops the session, halves, and listener together (teardown structural, compiler-enforced). - `tests/composed-accept.rs`: the full story (real bound, real peer, raw pass-through round trip), client-gone teardown drop-witness, distinct tokens for concurrent BINDs, per-accept isolation of a FORBIDDEN forwarded open, late-forwarded correlation miss. - The producer-side adopted forwarded entry rides the per-adopter contract (transport-EOF reap), as upstream's bind-first suites concede; the no-leak probe reflects that shape. Verification: cargo test (default + --all-features), wasm check/clippy (hard gate), clippy --all-targets --all-features -D warnings, fmt --check — all clean.
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//! The composed accept integration tests (ADR-007 variant 2 — the
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//! BIND accept whose listener lives on an alktunnels 0.2.0 bind-first
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//! listen resource, end to end over channels): the graduation's
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//! vanilla fidelity (reply#1 = the real `bound`; reply#2 = the
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//! forwarded op's real `peer` — no stand-ins), the raw pass-through
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//! data plane, the client-gone teardown (drop-witness), two concurrent
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//! BIND sessions' distinct tokens, and the per-accept isolation.
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//!
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//! The topology: the opener (the SOCKS5 consumer side) dials the
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//! transport; the tunnel producer serves BOTH the alktunnels bind-first
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//! open op and the SOCKS5 open op on one registry. The forwarded op
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//! serves on the opener side (post-hoc `register_forwarded_serving` —
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//! the correlation registry the composed accept factories ride).
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#![cfg(feature = "composed")]
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mod harness;
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use std::net::SocketAddr;
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use std::sync::Arc;
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use std::time::Duration;
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use alksocks::composed::{bindfirst_accept, register_forwarded_serving};
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use alksocks::consumer::BindSession;
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use alksocks::rfc1928::util::target_addr::ToTargetAddr;
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use alktunnels::params::{Substrate, SubstrateAddr};
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use alktunnels::producer::{
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BindFirstAcceptLoop, BindFn, BoundListener, ResourceRegistry, TargetHandle,
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TunnelEstablishError,
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};
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use tokio::io::{AsyncReadExt, AsyncWriteExt};
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use tokio::sync::Notify;
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/// The resource the bind-first producer serves (the tests' only
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/// subscription — the registry namespace gate).
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const RESOURCE: &str = "bind";
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/// The bound address the test bind reports (the "OS-chosen" stand-in —
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/// the test's queue listener owns it; fidelity is the assert's job).
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const BOUND_PORT: u16 = 42113;
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/// The peer address the accepted pairs report (the "app server" — the
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/// forwarded op's `peer` param carries it to reply#2).
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const PEER_PORT: u16 = 55231;
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/// The test bind (the assembly's bind seam): reports the test's
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/// bound address + an opaque listener witness.
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fn test_bind() -> BindFn {
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Arc::new(|_substrate, _backing| {
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Box::pin(async {
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Ok(BoundListener {
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listener: Arc::new(()) as Arc<dyn std::any::Any + Send + Sync>,
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bound: SubstrateAddr::HostPort {
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host: "127.0.0.1".to_string(),
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port: BOUND_PORT,
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},
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})
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})
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})
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}
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/// The accept-queue pair the test accept loop pops from (the alktunnels
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/// listener test's shape: a VecDeque + Notify — one accepted pair per
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/// dispatcher call).
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type AcceptQueue = (
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Arc<tokio::sync::Mutex<std::collections::VecDeque<(SubstrateAddr, TargetHandle)>>>,
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Arc<tokio::sync::Notify>,
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);
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fn fresh_queue() -> AcceptQueue {
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(
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Arc::new(tokio::sync::Mutex::new(std::collections::VecDeque::new())),
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Arc::new(Notify::new()),
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)
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}
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/// An accepted "connection" for the test accept loop: a duplex pair
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/// with an echo task on the far end (the app server's socket stand-in
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/// — the data plane's echo confirms the full round trip).
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fn accepted_halves(peer_addr: (&str, u16)) -> (SubstrateAddr, TargetHandle) {
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let (consumer_side, target_side) = tokio::io::duplex(64 * 1024);
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let (mut t_read, mut t_write) = tokio::io::split(target_side);
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tokio::spawn(async move {
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let mut buf = vec![0u8; 8192];
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loop {
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match t_read.read(&mut buf).await {
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Ok(0) | Err(_) => return,
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Ok(n) => {
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if t_write.write_all(&buf[..n]).await.is_err() {
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return;
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}
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}
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}
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}
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});
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let (c_read, c_write) = tokio::io::split(consumer_side);
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(
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SubstrateAddr::HostPort {
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host: peer_addr.0.to_string(),
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port: peer_addr.1,
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},
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TargetHandle {
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read: Box::new(c_read),
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write: Box::new(c_write),
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},
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)
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}
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/// The test accept loop (the dispatcher invokes the closure per
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/// accept): pop one accepted pair, or park until notified.
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fn queue_loop(queue: AcceptQueue) -> BindFirstAcceptLoop {
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let (queue, notify) = queue;
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Arc::new(move |_listener| {
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let queue = Arc::clone(&queue);
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let notify = Arc::clone(¬ify);
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Box::pin(async move {
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let popped = {
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let notified = std::pin::pin!(notify.notified());
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let mut q = queue.lock().await;
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if let Some(pair) = q.pop_front() {
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Some(pair)
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} else {
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drop(q);
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notified.await;
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let mut q = queue.lock().await;
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q.pop_front()
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}
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};
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popped.ok_or(TunnelEstablishError::DialFailed(
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"listener closed".to_string(),
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))
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})
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})
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}
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/// Push an accepted pair into the test's accept queue.
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async fn push_accept(queue: &AcceptQueue, peer: (&str, u16)) {
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let (peer_addr, handle) = accepted_halves(peer);
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queue.0.lock().await.push_back((peer_addr, handle));
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queue.1.notify_waiters();
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}
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/// The full wiring: the bind-first topology with the composed accept
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/// factory + the forwarded serving registered post-hoc on the opener's
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/// registry. Returns everything the tests drive.
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struct Suite {
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topo: harness::BindFirstTopology,
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queue: AcceptQueue,
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}
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async fn wire_suite() -> Suite {
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wire_suite_with_identity(harness::composed_opener_identity()).await
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}
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async fn wire_suite_with_identity(identity: alkcall::core::auth::Identity) -> Suite {
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let resource_registry = ResourceRegistry::new();
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resource_registry
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.register(RESOURCE, Substrate::Tcp, "assembly-owned")
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.await;
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let queue = fresh_queue();
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let topo = harness::wire_bindfirst_composed(
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resource_registry,
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test_bind(),
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queue_loop(queue.clone()),
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None, // the SOCKS5 openable registers post-hoc, below — the composed factory needs the opener's client
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identity,
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)
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.await;
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// The correlation registry rides the opener's serving registry
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// (the forwarded op's serving half — the provider's opener half).
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let registry = register_forwarded_serving(
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&alkcall::channels::operations::ChannelCore::new(
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topo.opener.manager().clone(),
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alkcall::channels::policy::default_policy(),
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),
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&topo.opener_registry,
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alkcall::core::auth::AuthContext::anonymous(b"alk/tunnel"),
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);
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// The SOCKS5 openable registers post-hoc (W2's shape) on the
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// producer's registry — with the REAL composed factory, which
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// closes over the opener's client + the correlation registry (both
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// only exist now).
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let factory = bindfirst_accept(Arc::clone(&topo.opener), Arc::clone(®istry), RESOURCE);
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let core = alkcall::channels::operations::ChannelCore::new(
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topo.producer_manager.clone(),
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alkcall::channels::policy::default_policy(),
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);
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alksocks::producer::Socks5Producer::builder()
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.accept(factory)
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.build()
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.register(
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&core,
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&topo.producer_registry,
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alkcall::core::auth::AuthContext::anonymous(b"alk/socks5"),
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None,
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)
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.expect("register socks5 openable post-hoc (the composed accept factory)");
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Suite { topo, queue }
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}
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/// Open a BIND session through the composed accept (the SOCKS5 BIND
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/// client over channels — the consumer session type). The session
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/// drives the whole pipeline: open → negotiate → BIND → reply#1 (the
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/// factory's real `bound`) → quiet wait (the factory's accept future)
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/// → reply#2 (the real peer).
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async fn bind_session(suite: &Suite) -> BindSession {
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BindSession::bind(
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suite.topo.opener.as_ref(),
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("bind.test", 2121).to_target_addr().unwrap(),
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)
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.await
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.expect("the session binds through the composed accept")
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}
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/// The no-leak probe: the opener side ends with channel 0 (+ the
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/// live channels the test names); the producer side ends with channel
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/// 0, the SOCKS5 channels the test names, AND any odd id — the
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/// producer-side ADOPTED forwarded channels (opener-allocated ids,
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/// adopted inside the producer's `open_forwarded` caller; per-session
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/// ownership per alktunnels ADR-005 — their entries reap at transport
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/// EOF, not at the listener's teardown; upstream's own bind-first
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/// suites make the same concession in `no_stray_channels`).
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async fn assert_only_channels(
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topo: &harness::BindFirstTopology,
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opener_extra: &[u32],
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producer_extra: &[u32],
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) {
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let opener_ids = topo.opener.manager().channel_ids();
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let producer_ids = topo.producer_manager.channel_ids();
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let opener_ok = opener_ids
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.iter()
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.all(|id| *id == 0 || opener_extra.contains(id));
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let producer_ok = producer_ids
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.iter()
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.all(|id| *id == 0 || *id % 2 == 1 || producer_extra.contains(id));
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assert!(
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opener_ok && producer_ok,
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"channel sets: opener={opener_ids:?} producer={producer_ids:?}"
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);
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}
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/// THE gate: the full composed BIND story — reply#1 carries the real
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/// `bound` (the graduation's vanilla fidelity), an app server "dials"
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/// (the queue accept), reply#2 carries the real peer (the forwarded
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/// op's `peer` param), and the pass-through data plane round-trips
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/// through the forwarded channel to the echo task and back.
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#[tokio::test]
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async fn composed_bind_full_story_bound_peer_and_round_trip() {
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let _ = tracing_subscriber::fmt()
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.with_max_level(tracing::level_filters::LevelFilter::TRACE)
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.with_test_writer()
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.try_init();
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let suite = wire_suite().await;
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// The BIND session rides the real composed factory (the SOCKS5
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// registration's accept seam — replaced post-hoc per-suite; the
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// registration reads through the shared registry per dispatch, so
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// the session's open dispatches with the factory in place).
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let mut session = bind_session(&suite).await;
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let channel_id = session.channel_id();
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assert!(
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suite.topo.producer_manager.has_channel(channel_id),
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"the SOCKS5 channel is live on the producer side"
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);
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// Reply#1: the REAL bound (the open-op reply's `bound` field — no
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// expected-addr stand-in; the test bind's reported address).
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let bind_addr = session.reply1().expect("reply#1").bind_addr;
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assert_eq!(
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bind_addr,
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alksocks::rfc1928::util::target_addr::TargetAddr::Ip(SocketAddr::from((
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[127, 0, 0, 1],
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BOUND_PORT
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))),
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"reply#1 advertises the real OS-chosen bound"
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);
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// The app server dials the far listener (the queue accept) — the
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// producer's accept loop opens the forwarded channel toward the
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// opener; the correlation registry delivers it into the accept
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// future; reply#2 carries the real peer.
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push_accept(&suite.queue, ("10.0.0.1", PEER_PORT)).await;
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let mut plane = tokio::time::timeout(Duration::from_secs(10), session.await_inbound())
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.await
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.expect("reply#2 within timeout")
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.expect("await_inbound ok")
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.expect("the plane exists");
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assert_eq!(
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plane.peer,
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alksocks::rfc1928::util::target_addr::TargetAddr::Ip(SocketAddr::from((
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[10, 0, 0, 1],
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PEER_PORT
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))),
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"reply#2 carries the forwarded op's real peer"
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);
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// The pass-through data plane: client bytes cross the SOCKS5
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// channel → the producer's pump → the forwarded channel → the
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// accepted halves' echo → and back.
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plane.write_all(b"bind-ping").await.expect("write");
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plane.flush().await.expect("flush");
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let mut buf = [0u8; 9];
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tokio::time::timeout(Duration::from_secs(10), plane.read_exact(&mut buf))
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.await
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.expect("round trip")
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.expect("read");
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assert_eq!(&buf, b"bind-ping");
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// Teardown: the session reaps its SOCKS5 channel; the data plane's
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// halves drop (the owner wrapper reaps the forwarded channel).
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drop(plane);
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assert!(session.close().await, "the SOCKS5 channel reaped");
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// The teardown cascade: the data plane's halves drop → the
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// forwarded handler's pump EOFs → the wrapper reaps the forwarded
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// channel → the listener dropped with the handle → the listen
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// channel EOFs → the far accept loop exits. Settle, then assert.
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for _ in 0..50 {
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tokio::time::sleep(Duration::from_millis(100)).await;
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let opener_ids = suite.topo.opener.manager().channel_ids();
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if opener_ids.iter().all(|&id| id == 0) {
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break;
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}
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}
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// The opener side holds only channel 0 (the producer-allocated
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// forwarded channel's entry rides the opener's manager per its own
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// adopter contract — alktunnels ADR-005). The producer side may
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// retain the adopted forwarded channel (see `assert_only_channels`
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// — its adopter's session dropped with the plane; the entry reaps
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// at transport EOF, not at the listener's).
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assert_only_channels(&suite.topo, &[0], &[channel_id]).await;
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}
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/// The client-gone teardown (the drop-witness): dropping the BIND
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/// session mid-quiet-wait releases the far listener — the accept
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/// future owns it end-to-end (the quiet wait's `select!` drop IS the
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/// teardown).
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#[tokio::test]
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async fn client_gone_teardown_releases_the_listener() {
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let suite = wire_suite().await;
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let mut session = bind_session(&suite).await;
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let socks5_channel = session.channel_id();
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let _ = session.reply1().expect("reply#1");
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|
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// The client vanishes (drop = the quiet wait's select! observes
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// the channel EOF → the accept future drops → the TunnelListener
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// inside it drops → the listen channel EOFs → the far accept
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// dispatcher tears down).
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drop(session);
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// The SOCKS5 channel reaps; the listen channel (the far listener's
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// carrier) reaps too — no leaked listener, no leaked channel.
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let mut socks5_gone = false;
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let mut listen_gone = false;
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for _ in 0..50 {
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tokio::time::sleep(Duration::from_millis(200)).await;
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socks5_gone = !suite.topo.producer_manager.has_channel(socks5_channel);
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// The listen channel's id is unknown here (the accept future
|
||||
// held it); the aggregate leak probe is the witness: after the
|
||||
// teardown cascade every channel is gone on both sides.
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||||
listen_gone = suite
|
||||
.topo
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||||
.producer_manager
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||||
.channel_ids()
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||||
.iter()
|
||||
.all(|&id| id == 0);
|
||||
if socks5_gone && listen_gone {
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||||
break;
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||||
}
|
||||
}
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||||
assert!(
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||||
socks5_gone,
|
||||
"the SOCKS5 channel reaped after the client dropped"
|
||||
);
|
||||
assert!(
|
||||
listen_gone,
|
||||
"the listen channel reaped (no leaked listener): producer={:?}",
|
||||
suite.topo.producer_manager.channel_ids()
|
||||
);
|
||||
// The accept queue was never consumed (the listener died before
|
||||
// any app server arrived).
|
||||
assert!(
|
||||
suite.queue.0.lock().await.is_empty(),
|
||||
"the dropped listener consumed nothing"
|
||||
);
|
||||
assert_only_channels(&suite.topo, &[0], &[0]).await;
|
||||
}
|
||||
|
||||
/// Two concurrent BIND sessions get distinct tokens (the mint is
|
||||
/// per-open); each accept future correlates only ITS forwarded
|
||||
/// session.
|
||||
#[tokio::test]
|
||||
async fn concurrent_bind_sessions_get_distinct_tokens() {
|
||||
let suite = wire_suite().await;
|
||||
let mut s1 = bind_session(&suite).await;
|
||||
let mut s2 = bind_session(&suite).await;
|
||||
assert_ne!(s1.channel_id(), s2.channel_id(), "distinct SOCKS5 channels");
|
||||
let _ = s1.reply1().expect("reply#1 s1");
|
||||
let _ = s2.reply1().expect("reply#2 s2");
|
||||
|
||||
// Two accepts: the tokens are distinct (two listen opens minted
|
||||
// distinct tokens — observably: both sessions resolve their own
|
||||
// forwarded sessions, the correlation delivered each to the right
|
||||
// waiter).
|
||||
push_accept(&suite.queue, ("10.0.0.1", PEER_PORT)).await;
|
||||
push_accept(&suite.queue, ("10.0.0.2", PEER_PORT + 1)).await;
|
||||
|
||||
let mut p1 = tokio::time::timeout(Duration::from_secs(10), s1.await_inbound())
|
||||
.await
|
||||
.expect("s1 reply#2")
|
||||
.expect("s1 plane ok")
|
||||
.expect("s1 plane");
|
||||
let mut p2 = tokio::time::timeout(Duration::from_secs(10), s2.await_inbound())
|
||||
.await
|
||||
.expect("s2 reply#2")
|
||||
.expect("s2 plane ok")
|
||||
.expect("s2 plane");
|
||||
|
||||
// Each plane pumps only its own accepted connection (the
|
||||
// correlation routed by token): distinct peer ports arrive, each
|
||||
// on the session whose listener accepted it.
|
||||
let peers = [p1.peer.clone(), p2.peer.clone()];
|
||||
assert_ne!(peers[0], peers[1], "the two accepts routed distinctly");
|
||||
|
||||
// Both data planes round-trip independently.
|
||||
p1.write_all(b"one").await.expect("p1 write");
|
||||
p2.write_all(b"two").await.expect("p2 write");
|
||||
let mut b1 = [0u8; 3];
|
||||
let mut b2 = [0u8; 3];
|
||||
tokio::time::timeout(Duration::from_secs(10), p1.read_exact(&mut b1))
|
||||
.await
|
||||
.expect("p1 echo")
|
||||
.expect("p1 read");
|
||||
tokio::time::timeout(Duration::from_secs(10), p2.read_exact(&mut b2))
|
||||
.await
|
||||
.expect("p2 echo")
|
||||
.expect("p2 read");
|
||||
assert_eq!(&b1, b"one");
|
||||
assert_eq!(&b2, b"two");
|
||||
|
||||
drop(p1);
|
||||
drop(p2);
|
||||
assert!(s1.close().await);
|
||||
assert!(s2.close().await);
|
||||
tokio::time::sleep(Duration::from_millis(300)).await;
|
||||
assert_only_channels(&suite.topo, &[0], &[0]).await;
|
||||
}
|
||||
|
||||
/// A forwarded-open failure is per-accept isolated: an opener identity
|
||||
/// without `tunnel:forwarded` makes the forwarded open fail FORBIDDEN
|
||||
/// — the BIND session's accept future never resolves a forwarded
|
||||
/// session (reply#2's mapped refusal), the listen channel stays
|
||||
/// usable, and the failure does not tear the listener down.
|
||||
#[tokio::test]
|
||||
async fn forwarded_open_failure_is_per_accept_isolated() {
|
||||
let suite = wire_suite_with_identity(harness::composed_scopeless_opener_identity()).await;
|
||||
let mut session = bind_session(&suite).await;
|
||||
let _ = session.reply1().expect("reply#1");
|
||||
|
||||
// The accept fires (the queue accept consumed — the producer's
|
||||
// accept loop is alive), but the forwarded open fails FORBIDDEN.
|
||||
push_accept(&suite.queue, ("10.0.0.1", PEER_PORT)).await;
|
||||
|
||||
// The forwarded-open failure is per-accept isolated AT THE TUNNEL
|
||||
// LAYER: the producer's accept loop drops that accepted connection
|
||||
// and keeps serving. The accept future stays parked (the SOCKS5
|
||||
// producer never learns of the tunnel-layer failure — the
|
||||
// quiet-wait shape is unaffected), so the queue drains both
|
||||
// accepts and the listener survives (the alktunnels producer
|
||||
// suite's `forwarded_open_failure_isolates_the_accept` pin, end to
|
||||
// end).
|
||||
push_accept(&suite.queue, ("10.0.0.1", PEER_PORT)).await;
|
||||
tokio::time::sleep(Duration::from_millis(300)).await;
|
||||
assert!(
|
||||
suite.queue.0.lock().await.is_empty(),
|
||||
"the accept loop consumed both accepts (alive throughout)"
|
||||
);
|
||||
drop(session);
|
||||
tokio::time::sleep(Duration::from_millis(300)).await;
|
||||
}
|
||||
|
||||
/// The dropped listener (client gone mid-quiet-wait) leaves a
|
||||
/// forwarded open nowhere to go: the correlation miss drops the
|
||||
/// forwarded channel (teardown-at-birth — pinned by the dead-oneshot
|
||||
/// probe's aggregate-leak witness).
|
||||
#[tokio::test]
|
||||
async fn late_forwarded_open_after_client_gone_drops_the_channel() {
|
||||
let suite = wire_suite().await;
|
||||
let mut session = bind_session(&suite).await;
|
||||
let _ = session.reply1().expect("reply#1");
|
||||
drop(session);
|
||||
|
||||
// The client is gone; the listener is being torn down. An accept
|
||||
// arriving in the race window may reach the dispatcher before the
|
||||
// EOF sentinel does; the forwarded open then finds a dead oneshot
|
||||
// (the correlation miss) and drops the channel.
|
||||
push_accept(&suite.queue, ("10.0.0.1", PEER_PORT)).await;
|
||||
tokio::time::sleep(Duration::from_millis(500)).await;
|
||||
// Either the listener was already gone (the accept queued
|
||||
// unconsumed) or the forwarded channel dropped at birth — either
|
||||
// way: no leaked channels on the opener side.
|
||||
assert_only_channels(&suite.topo, &[0], &[0]).await;
|
||||
}
|
||||
Reference in new issue
Block a user