Live macOS test against the production server uncovered six bugs (one of which
turned out to be a port collision with sing-box, not a real bug); this commit
addresses all of them and adds v3.4 port discovery so the same collision is
handled transparently next time.
## v3.4 server port-discovery
- Defaults moved off 443/444 to 8443/8443/8444 (TransportSection::default,
ServerInitOpts, ProvisionClientOpts, CLI flags). 443 is heavily contested in
practice (sing-box, Hysteria2, reverse proxies) and the previous default
silently lost the bind when a co-tenant was already there.
- MultiServer::bind_with_outer_or_scan: scans forward up to
DEFAULT_PORT_SCAN_MAX (20) candidates per transport when the requested port
is occupied; QUIC keeps walking if it lands on the custom-UDP port.
- MultiServer::bound_addrs(): the actual addresses each transport bound to.
- Server logs the bound addresses and writes a runtime snapshot
(server.toml.runtime.json) when they differ from the requested ones, so
`aura sign-bridges` can re-sign the bridges manifest later.
- BridgeManifest gains an optional `endpoints: Vec<BridgeEndpoint>` field
with per-transport ports. Backward-compatible: old v3.3 clients ignore the
field and continue to use the v1 `bridges` line.
- `aura sign-bridges --endpoints HOST:tcp=N:quic=N:udp=N` to mint v3.4
manifests; bridges line is auto-synthesised for v3.3 clients.
## Bug fixes from the live test
- macOS TUN naming (#41): the tun crate rejects names that don't match
^utun[0-9]+$. On macOS we now substitute `""` (kernel auto-assigns utunN),
capture the assigned name via inner.tun_name(), and propagate it through to
os_routes::OsRouteGuard::install — so `route add -interface utunN` uses
the real interface, not "aura0".
- Packet counters (#42): Stats { tx_packets, rx_packets } are now actually
bumped by the data path. `aura status` shows live numbers instead of
permanent zeros.
- render_client_toml schema (#44): provisioner emits proper
`[[tunnel.split.vpn]] cidr = "..."` / `[[tunnel.split.direct]]` blocks from
new --vpn-cidrs / --direct-cidrs flags. The v3.3 `vpn_cidrs = [...]` flat
array was silently ignored by serde, leaving users with `rules: 0` even
when their CIDRs looked right.
- #43 / #46 (TCP/443 dial early-eof / no payload back): diagnosed as the
sing-box port collision, not an Aura bug. The v3.4 port-scan path makes it
go away — the server picks a free port and clients learn it from the
manifest.
## Test coverage
Three new unit tests for the port-scanner (UDP busy, TCP busy, zero budget);
two new tests for v3.4 BridgeManifest round-trip with endpoints; one
integration test for the new `[[tunnel.split.vpn]]` rendering; tests for the
runtime-state file write/read round-trip; agent-added router-counter tests
in aura-tunnel/tests/routes.rs.
cargo test --workspace, cargo clippy --workspace -- -D warnings, and
cargo fmt --check all pass.
#45 (silent client exit when underlying QUIC transport breaks) is still
outstanding — needs deeper investigation; deferred to a follow-up.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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