feat(nat): Tailscale-inspired STUN/ICE + port mapping + mid-call re-gathering (#28)
Phase 8: 5 new modules bringing NAT traversal close to Tailscale's approach. - stun.rs: RFC 5389 STUN client — public server reflexive discovery, XOR-MAPPED-ADDRESS parsing, parallel probe with retry, STUN fallback in desktop try_reflect_own_addr() - portmap.rs: NAT-PMP (RFC 6886) + PCP (RFC 6887) + UPnP IGD port mapping — gateway discovery, acquire/release/refresh lifecycle, new PeerCandidates.mapped candidate type in dial order - ice_agent.rs: candidate lifecycle — gather(), re_gather(), apply_peer_update() with monotonic generation counter, CandidateUpdate signal message forwarded by relay - netcheck.rs: comprehensive diagnostic — NAT type, IPv4/v6, port mapping availability, relay latencies, CLI --netcheck - relay_map.rs: RTT-sorted relay map, preferred() selection, populate_from_ack() for RegisterPresenceAck.available_relays Relay: CallRegistry stores + cross-wires caller/callee_mapped_addr into CallSetup.peer_mapped_addr. Region config + available_relays populated from federation peers in RegisterPresenceAck. Desktop: place_call/answer_call call acquire_port_mapping() and fill caller/callee_mapped_addr. STUN+relay combined NAT detection. 571 tests pass (66 new), 0 regressions, 0 warnings. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
@@ -61,6 +61,13 @@ pub struct DirectCall {
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/// interface addresses from the `DirectCallAnswer`. Cross-
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/// wired into the caller's `CallSetup.peer_local_addrs`.
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pub callee_local_addrs: Vec<String>,
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/// Phase 8 (Tailscale-inspired): caller's port-mapped
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/// external address from NAT-PMP/PCP/UPnP. Cross-wired
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/// into callee's `CallSetup.peer_mapped_addr`.
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pub caller_mapped_addr: Option<String>,
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/// Phase 8: callee's port-mapped external address.
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/// Cross-wired into caller's `CallSetup.peer_mapped_addr`.
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pub callee_mapped_addr: Option<String>,
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}
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/// Registry of active direct calls.
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@@ -92,6 +99,8 @@ impl CallRegistry {
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peer_relay_fp: None,
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caller_local_addrs: Vec::new(),
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callee_local_addrs: Vec::new(),
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caller_mapped_addr: None,
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callee_mapped_addr: None,
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};
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self.calls.insert(call_id.clone(), call);
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self.calls.get(&call_id).unwrap()
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@@ -142,6 +151,22 @@ impl CallRegistry {
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}
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}
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/// Phase 8: stash the caller's port-mapped address from
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/// the `DirectCallOffer`.
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pub fn set_caller_mapped_addr(&mut self, call_id: &str, addr: Option<String>) {
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if let Some(call) = self.calls.get_mut(call_id) {
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call.caller_mapped_addr = addr;
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}
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}
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/// Phase 8: stash the callee's port-mapped address from
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/// the `DirectCallAnswer`.
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pub fn set_callee_mapped_addr(&mut self, call_id: &str, addr: Option<String>) {
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if let Some(call) = self.calls.get_mut(call_id) {
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call.callee_mapped_addr = addr;
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}
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}
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/// Get a call by ID.
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pub fn get(&self, call_id: &str) -> Option<&DirectCall> {
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self.calls.get(call_id)
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@@ -340,6 +365,49 @@ mod tests {
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reg.set_peer_relay_fp("does-not-exist", Some("x".into()));
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}
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#[test]
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fn call_registry_stores_mapped_addrs() {
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let mut reg = CallRegistry::new();
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reg.create_call("c1".into(), "alice".into(), "bob".into());
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// Default: both mapped addrs are None.
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let c = reg.get("c1").unwrap();
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assert!(c.caller_mapped_addr.is_none());
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assert!(c.callee_mapped_addr.is_none());
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// Caller advertises its port-mapped addr via DirectCallOffer.
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reg.set_caller_mapped_addr("c1", Some("203.0.113.5:12345".into()));
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assert_eq!(
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reg.get("c1").unwrap().caller_mapped_addr.as_deref(),
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Some("203.0.113.5:12345")
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);
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// Callee responds with its mapped addr.
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reg.set_callee_mapped_addr("c1", Some("198.51.100.9:54321".into()));
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assert_eq!(
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reg.get("c1").unwrap().callee_mapped_addr.as_deref(),
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Some("198.51.100.9:54321")
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);
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// Both addrs readable — relay uses them to cross-wire
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// peer_mapped_addr in CallSetup.
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let c = reg.get("c1").unwrap();
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assert_eq!(c.caller_mapped_addr.as_deref(), Some("203.0.113.5:12345"));
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assert_eq!(c.callee_mapped_addr.as_deref(), Some("198.51.100.9:54321"));
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// Setter on unknown call is a no-op.
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reg.set_caller_mapped_addr("nope", Some("x".into()));
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}
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#[test]
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fn call_registry_clearing_mapped_addr_works() {
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let mut reg = CallRegistry::new();
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reg.create_call("c1".into(), "alice".into(), "bob".into());
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reg.set_caller_mapped_addr("c1", Some("1.2.3.4:5".into()));
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reg.set_caller_mapped_addr("c1", None);
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assert!(reg.get("c1").unwrap().caller_mapped_addr.is_none());
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}
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#[test]
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fn call_registry_clearing_reflex_addr_works() {
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// Passing None to the setter must clear a previously-set value
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@@ -87,6 +87,14 @@ pub struct RelayConfig {
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/// Unlike [[peers]], no url is needed — the peer connects to us.
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#[serde(default)]
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pub trusted: Vec<TrustedConfig>,
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/// Phase 8: geographic region identifier (e.g., "us-east", "eu-west").
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/// Sent to clients in `RegisterPresenceAck.relay_region` so they can
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/// build a relay map for automatic selection.
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pub region: Option<String>,
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/// Phase 8: externally-advertised address for this relay. Used to
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/// populate `available_relays` in `RegisterPresenceAck`. If not set,
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/// `listen_addr` is used.
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pub advertised_addr: Option<SocketAddr>,
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/// Debug tap: log packet headers for matching rooms ("*" = all rooms).
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/// Activated via --debug-tap <room> or debug_tap = "room" in TOML.
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pub debug_tap: Option<String>,
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@@ -114,6 +122,8 @@ impl Default for RelayConfig {
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peers: Vec::new(),
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global_rooms: Vec::new(),
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trusted: Vec::new(),
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region: None,
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advertised_addr: None,
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debug_tap: None,
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event_log: None,
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}
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@@ -538,6 +538,7 @@ async fn main() -> anyhow::Result<()> {
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ref call_id,
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ref caller_reflexive_addr,
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ref caller_local_addrs,
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ref caller_mapped_addr,
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..
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} => {
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// Is the target on THIS relay? If not, drop —
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@@ -557,7 +558,8 @@ async fn main() -> anyhow::Result<()> {
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// Stash in local registry so the answer path
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// can find the call + route the reply back
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// through the same federation link. Include
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// Phase 5.5 LAN host candidates too.
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// Phase 5.5 LAN host candidates + Phase 8
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// port-mapped addr.
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{
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let mut reg = call_registry_d.lock().await;
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reg.create_call(
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@@ -567,6 +569,7 @@ async fn main() -> anyhow::Result<()> {
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);
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reg.set_caller_reflexive_addr(call_id, caller_reflexive_addr.clone());
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reg.set_caller_local_addrs(call_id, caller_local_addrs.clone());
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reg.set_caller_mapped_addr(call_id, caller_mapped_addr.clone());
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reg.set_peer_relay_fp(call_id, Some(origin_relay_fp.clone()));
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}
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// Deliver the offer to the local target.
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@@ -585,6 +588,7 @@ async fn main() -> anyhow::Result<()> {
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accept_mode,
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ref callee_reflexive_addr,
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ref callee_local_addrs,
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ref callee_mapped_addr,
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..
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} => {
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// Look up the local caller fp from the registry.
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@@ -616,14 +620,11 @@ async fn main() -> anyhow::Result<()> {
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}
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// Accept — stash the callee's reflex addr + LAN
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// host candidates + mark the call active,
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// then read back everything needed to cross-
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// wire peer_direct_addr + peer_local_addrs in
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// the local CallSetup.
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// Also set peer_relay_fp so the originating
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// relay knows where to forward MediaPathReport.
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// host candidates + mapped addr + mark the call
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// active, then read back everything needed to
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// cross-wire into the local CallSetup.
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let room_name = format!("call-{call_id}");
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let (callee_addr_for_setup, callee_local_for_setup) = {
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let (callee_addr_for_setup, callee_local_for_setup, callee_mapped_for_setup) = {
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let mut reg = call_registry_d.lock().await;
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reg.set_active(call_id, accept_mode, room_name.clone());
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reg.set_peer_relay_fp(call_id, Some(origin_relay_fp.clone()));
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@@ -632,10 +633,12 @@ async fn main() -> anyhow::Result<()> {
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callee_reflexive_addr.clone(),
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);
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reg.set_callee_local_addrs(call_id, callee_local_addrs.clone());
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reg.set_callee_mapped_addr(call_id, callee_mapped_addr.clone());
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let c = reg.get(call_id);
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(
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c.and_then(|c| c.callee_reflexive_addr.clone()),
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c.map(|c| c.callee_local_addrs.clone()).unwrap_or_default(),
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c.and_then(|c| c.callee_mapped_addr.clone()),
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)
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};
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@@ -648,19 +651,13 @@ async fn main() -> anyhow::Result<()> {
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}
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// Emit the LOCAL CallSetup to our local caller.
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// relay_addr = our own advertised addr so if P2P
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// fails the caller will at least dial OUR relay
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// (single-relay fallback — Phase 4.1 will wire
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// federated media so that actually reaches the
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// peer). peer_direct_addr = the callee's reflex
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// addr carried in the answer. peer_local_addrs
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// = callee's LAN host candidates (Phase 5.5 ICE).
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let setup = SignalMessage::CallSetup {
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call_id: call_id.clone(),
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room: room_name.clone(),
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relay_addr: advertised_addr_d.clone(),
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peer_direct_addr: callee_addr_for_setup,
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peer_local_addrs: callee_local_for_setup,
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peer_mapped_addr: callee_mapped_for_setup,
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};
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let hub = signal_hub_d.lock().await;
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let _ = hub.send_to(&caller_fp, &setup).await;
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@@ -772,6 +769,14 @@ async fn main() -> anyhow::Result<()> {
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let signal_hub = signal_hub.clone();
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let call_registry = call_registry.clone();
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let advertised_addr_str = advertised_addr_str.clone();
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// Phase 8: relay region + peer addresses for RegisterPresenceAck
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let relay_region = config.region.clone();
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let relay_peers_for_ack: Vec<String> = config.peers.iter()
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.filter_map(|p| {
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let label = p.label.as_deref().unwrap_or("peer");
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Some(format!("{label}|{}", p.url))
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})
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.collect();
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// Phase 4: per-task clone of this relay's federation TLS
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// fingerprint so the FederatedSignalForward envelopes the
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// spawned signal handler builds carry `origin_relay_fp`.
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@@ -1005,6 +1010,8 @@ async fn main() -> anyhow::Result<()> {
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success: true,
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error: None,
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relay_build: Some(BUILD_GIT_HASH.to_string()),
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relay_region: relay_region.clone(),
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available_relays: relay_peers_for_ack.clone(),
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}).await;
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info!(%addr, fingerprint = %client_fp, alias = ?client_alias, "signal client registered");
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@@ -1019,12 +1026,14 @@ async fn main() -> anyhow::Result<()> {
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ref call_id,
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ref caller_reflexive_addr,
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ref caller_local_addrs,
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ref caller_mapped_addr,
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..
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} => {
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let target_fp = target_fingerprint.clone();
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let call_id = call_id.clone();
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let caller_addr_for_registry = caller_reflexive_addr.clone();
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let caller_local_for_registry = caller_local_addrs.clone();
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let caller_mapped_for_registry = caller_mapped_addr.clone();
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// Check if target is online
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let online = {
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@@ -1097,6 +1106,10 @@ async fn main() -> anyhow::Result<()> {
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&call_id,
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caller_local_for_registry.clone(),
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);
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reg.set_caller_mapped_addr(
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&call_id,
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caller_mapped_for_registry.clone(),
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);
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}
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// Send ringing to caller immediately
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@@ -1118,6 +1131,7 @@ async fn main() -> anyhow::Result<()> {
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reg.create_call(call_id.clone(), client_fp.clone(), target_fp.clone());
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reg.set_caller_reflexive_addr(&call_id, caller_addr_for_registry);
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reg.set_caller_local_addrs(&call_id, caller_local_for_registry);
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reg.set_caller_mapped_addr(&call_id, caller_mapped_for_registry);
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}
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// Forward offer to callee
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@@ -1139,12 +1153,14 @@ async fn main() -> anyhow::Result<()> {
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ref accept_mode,
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ref callee_reflexive_addr,
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ref callee_local_addrs,
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ref callee_mapped_addr,
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..
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} => {
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let call_id = call_id.clone();
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let mode = *accept_mode;
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let callee_addr_for_registry = callee_reflexive_addr.clone();
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let callee_local_for_registry = callee_local_addrs.clone();
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let callee_mapped_for_registry = callee_mapped_addr.clone();
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// Phase 4: look up peer fingerprint AND
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// peer_relay_fp in one lock acquisition.
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@@ -1207,17 +1223,20 @@ async fn main() -> anyhow::Result<()> {
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// BOTH parties' addrs so we can cross-wire
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// peer_direct_addr on the CallSetups below.
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let room = format!("call-{call_id}");
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let (caller_addr, callee_addr, caller_local, callee_local) = {
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let (caller_addr, callee_addr, caller_local, callee_local, caller_mapped, callee_mapped) = {
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let mut reg = call_registry.lock().await;
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reg.set_active(&call_id, mode, room.clone());
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reg.set_callee_reflexive_addr(&call_id, callee_addr_for_registry);
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reg.set_callee_local_addrs(&call_id, callee_local_for_registry.clone());
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reg.set_callee_mapped_addr(&call_id, callee_mapped_for_registry);
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let call = reg.get(&call_id);
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(
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call.and_then(|c| c.caller_reflexive_addr.clone()),
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call.and_then(|c| c.callee_reflexive_addr.clone()),
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call.map(|c| c.caller_local_addrs.clone()).unwrap_or_default(),
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call.map(|c| c.callee_local_addrs.clone()).unwrap_or_default(),
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call.and_then(|c| c.caller_mapped_addr.clone()),
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call.and_then(|c| c.callee_mapped_addr.clone()),
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)
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};
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info!(
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@@ -1266,6 +1285,7 @@ async fn main() -> anyhow::Result<()> {
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relay_addr: relay_addr_for_setup,
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peer_direct_addr: caller_addr.clone(),
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peer_local_addrs: caller_local.clone(),
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peer_mapped_addr: caller_mapped.clone(),
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};
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let hub = signal_hub.lock().await;
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let _ = hub.send_to(&client_fp, &setup_for_callee).await;
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@@ -1278,14 +1298,15 @@ async fn main() -> anyhow::Result<()> {
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}
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// Send CallSetup to BOTH parties with
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// cross-wired peer_direct_addr +
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// peer_local_addrs (Phase 5.5 ICE).
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// cross-wired candidates (Phase 5.5 ICE
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// + Phase 8 port-mapped addrs).
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let setup_for_caller = SignalMessage::CallSetup {
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call_id: call_id.clone(),
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room: room.clone(),
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relay_addr: relay_addr_for_setup.clone(),
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peer_direct_addr: callee_addr.clone(),
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peer_local_addrs: callee_local.clone(),
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peer_mapped_addr: callee_mapped,
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};
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let setup_for_callee = SignalMessage::CallSetup {
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call_id: call_id.clone(),
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@@ -1293,6 +1314,7 @@ async fn main() -> anyhow::Result<()> {
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relay_addr: relay_addr_for_setup,
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peer_direct_addr: caller_addr.clone(),
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peer_local_addrs: caller_local.clone(),
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peer_mapped_addr: caller_mapped,
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};
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let hub = signal_hub.lock().await;
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let _ = hub.send_to(&peer_fp, &setup_for_caller).await;
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@@ -1382,6 +1404,45 @@ async fn main() -> anyhow::Result<()> {
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}
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}
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// Phase 8: forward CandidateUpdate to the
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// call peer for mid-call ICE re-gathering.
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// Same forwarding pattern as MediaPathReport.
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SignalMessage::CandidateUpdate { ref call_id, .. } => {
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let (peer_fp, peer_relay_fp) = {
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let reg = call_registry.lock().await;
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match reg.get(call_id) {
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Some(c) => (
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reg.peer_fingerprint(call_id, &client_fp)
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.map(|s| s.to_string()),
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c.peer_relay_fp.clone(),
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),
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None => (None, None),
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}
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};
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|
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if let Some(fp) = peer_fp {
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if let Some(ref origin_fp) = peer_relay_fp {
|
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if let Some(ref fm) = federation_mgr {
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let forward = SignalMessage::FederatedSignalForward {
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inner: Box::new(msg.clone()),
|
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origin_relay_fp: tls_fp.clone(),
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};
|
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if let Err(e) = fm.send_signal_to_peer(origin_fp, &forward).await {
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warn!(
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%call_id,
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%origin_fp,
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error = %e,
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"cross-relay CandidateUpdate forward failed"
|
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);
|
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}
|
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}
|
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} else {
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let hub = signal_hub.lock().await;
|
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let _ = hub.send_to(&fp, &msg).await;
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}
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}
|
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}
|
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|
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SignalMessage::Ping { timestamp_ms } => {
|
||||
let _ = transport.send_signal(&SignalMessage::Pong { timestamp_ms }).await;
|
||||
}
|
||||
|
||||
@@ -52,6 +52,7 @@ fn alice_offer(call_id: &str) -> SignalMessage {
|
||||
supported_profiles: vec![],
|
||||
caller_reflexive_addr: Some(ALICE_ADDR.into()),
|
||||
caller_local_addrs: Vec::new(),
|
||||
caller_mapped_addr: None,
|
||||
caller_build_version: None,
|
||||
}
|
||||
}
|
||||
@@ -133,6 +134,7 @@ fn bob_answer(call_id: &str) -> SignalMessage {
|
||||
chosen_profile: None,
|
||||
callee_reflexive_addr: Some(BOB_ADDR.into()),
|
||||
callee_local_addrs: Vec::new(),
|
||||
callee_mapped_addr: None,
|
||||
callee_build_version: None,
|
||||
}
|
||||
}
|
||||
@@ -178,6 +180,7 @@ fn relay_b_handle_local_answer(
|
||||
relay_addr: RELAY_B_ADDR.into(),
|
||||
peer_direct_addr: caller_addr,
|
||||
peer_local_addrs: Vec::new(),
|
||||
peer_mapped_addr: None,
|
||||
};
|
||||
let _ = callee_addr;
|
||||
(forward, setup_for_bob)
|
||||
@@ -219,6 +222,7 @@ fn relay_a_handle_forwarded_answer(
|
||||
relay_addr: RELAY_A_ADDR.into(),
|
||||
peer_direct_addr: callee_reflexive_addr,
|
||||
peer_local_addrs: Vec::new(),
|
||||
peer_mapped_addr: None,
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@@ -82,6 +82,7 @@ fn handle_answer_and_build_setups(
|
||||
relay_addr: "203.0.113.5:4433".into(),
|
||||
peer_direct_addr: callee_addr,
|
||||
peer_local_addrs: Vec::new(),
|
||||
peer_mapped_addr: None,
|
||||
};
|
||||
let setup_for_callee = SignalMessage::CallSetup {
|
||||
call_id,
|
||||
@@ -89,6 +90,7 @@ fn handle_answer_and_build_setups(
|
||||
relay_addr: "203.0.113.5:4433".into(),
|
||||
peer_direct_addr: caller_addr,
|
||||
peer_local_addrs: Vec::new(),
|
||||
peer_mapped_addr: None,
|
||||
};
|
||||
(setup_for_caller, setup_for_callee)
|
||||
}
|
||||
@@ -105,6 +107,7 @@ fn mk_offer(call_id: &str, caller_reflexive_addr: Option<&str>) -> SignalMessage
|
||||
supported_profiles: vec![],
|
||||
caller_reflexive_addr: caller_reflexive_addr.map(String::from),
|
||||
caller_local_addrs: Vec::new(),
|
||||
caller_mapped_addr: None,
|
||||
caller_build_version: None,
|
||||
}
|
||||
}
|
||||
@@ -123,6 +126,7 @@ fn mk_answer(
|
||||
chosen_profile: None,
|
||||
callee_reflexive_addr: callee_reflexive_addr.map(String::from),
|
||||
callee_local_addrs: Vec::new(),
|
||||
callee_mapped_addr: None,
|
||||
callee_build_version: None,
|
||||
}
|
||||
}
|
||||
|
||||
@@ -66,6 +66,8 @@ async fn spawn_mock_relay() -> (SocketAddr, tokio::task::JoinHandle<()>) {
|
||||
success: true,
|
||||
error: None,
|
||||
relay_build: None,
|
||||
relay_region: None,
|
||||
available_relays: Vec::new(),
|
||||
})
|
||||
.await;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user