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4 Commits
Author SHA1 Message Date
Johnathan Corgan 9a7fa921ab Discovery protocol: LookupRequest/LookupResponse handlers 
Implement the coordinate discovery protocol with flood-based lookup
and reverse-path response routing.

Wire format: LookupRequest (0x30) encode/decode with TTL, visited
bloom filter, origin coords. LookupResponse (0x31) encode/decode
with target coords and Schnorr proof signature.

Handler logic: request dedup by request_id, visited filter loop
prevention, TTL enforcement, lazy purge of expired entries (10s).
Response routing: originator caches route in route_cache, transit
nodes reverse-path forward via recent_requests.

Node state: RecentRequest struct, route_cache (RouteCache), and
recent_requests map for dedup + reverse-path forwarding.

13 handler tests (9 unit + 4 integration) plus 4 protocol tests.
392 tests pass, clean build.
 2026-02-12 14:46:33 +00:00
Johnathan Corgan 62ce267677 Session message encode/decode, disconnect and routing integration tests 
Add encode/decode for all session-layer message types (SessionSetup,
SessionAck, DataPacket, CoordsRequired, PathBroken) and SessionDatagram
link-layer envelope. Wire format follows design doc §8.0-8.6 with
address-only coordinate serialization (16 bytes/entry).

Struct additions: handshake_payload on SessionSetup/SessionAck, flags
on SessionAck, optional src_coords/dest_coords on DataPacket for route
cache warming (COORDS_PRESENT flag).

New disconnect integration tests verify cascading cleanup in multi-node
networks: chain peer removal, star hub departure, chain partition with
bloom filter update verification, all reason codes.

New routing tests validate bloom-filter-only transit behavior and peer
removal effects: confirm transit nodes without cached coords return None
(loop prevention), routing stops after partition, source-only coords
insufficient for multi-hop delivery.

361 tests pass (up from 335), zero warnings.
 2026-02-12 13:01:29 +00:00
Johnathan Corgan d41009b778 SessionDatagram redesign: add src_addr, reclassify error signals 
Add src_addr to SessionDatagram envelope (34-byte header: msg_type +
src_addr + dest_addr + hop_limit) so transit routers can route error
signals back to the packet's originator.

Reclassify CoordsRequired/PathBroken as link-layer error signals
(plaintext inside SessionDatagram) rather than e2e encrypted session
messages. Transit routers generate these when forwarding fails and
route them to src_addr; if source is also unreachable, drop silently.

Remove redundant src_addr/dest_addr/hop_limit from SessionSetup,
SessionAck, and DataPacket (now in envelope). DataPacket header
reduced from 36 to 4 bytes. Remove PathBroken.original_src.

Fix routing loop vulnerability: gate bloom filter path on having
cached dest_coords to prevent blind forwarding between peers.
Simplify select_best_candidate() to require coordinates.

Fix gossip protocol type codes (0x11->0x20, 0x12->0x30, 0x13->0x31)
for consistency across all design docs.

All 5 design docs updated and cross-checked for consistency.
335 tests pass, zero warnings.
 2026-02-12 11:32:45 +00:00
Johnathan Corgan 066865ddd7 Split protocol.rs into protocol/ directory, standardize imports, clean lib.rs 
- Replace use super::*; in node/lifecycle.rs with explicit imports,
  remove 10 resulting unused imports from node/mod.rs
- Split protocol.rs (1838 lines) into protocol/ directory:
  mod.rs (re-exports), error.rs, link.rs, tree.rs, filter.rs,
  discovery.rs, session.rs — each with co-located tests
- Remove unused flat re-exports from lib.rs for internal utility
  modules (wire, index, rate_limit, icmp, noise, tun)
- 316 tests pass, zero warnings
 2026-02-11 05:02:02 +00:00