remove username sniffer

PROTOCOL.md

@@ -195,7 +195,7 @@ Type : u8
 | `0x01` | Register       | C → S     | `Pattern: String` |
 | `0x02` | Unregister     | C → S     | `Pattern: String` |
 | `0x03` | RegisterAck    | S → C     | `Pattern: String`, `Status: u8` (0 = ok, 1 = invalid pattern) |
-| `0x04` | ControlRequest | S → C     | `CID: Bytes[16]`, `Pattern: String`, `PlayerIP: String`, `PlayerPort: U16`, `Username: String` |
+| `0x04` | ControlRequest | S → C     | `CID: Bytes[16]`, `Pattern: String`, `PlayerIP: String`, `PlayerPort: U16` |
 | `0x05` | Ping           | C → S     | `Nonce: I64` |
 | `0x06` | Pong           | S → C     | `Nonce: I64` |
 
@@ -214,9 +214,7 @@ Type : u8
   can look the pattern up in its own route table. `CID` is 16
   cryptographically-random bytes generated by the hub, unique to that pending
   player. `PlayerIP`/`PlayerPort` are the player's source address (used for
-  HAProxy v2). `Username` is the player's name, read best-effort from the Login
+  HAProxy v2).
-  Start packet — present when the client pipelined it with the Handshake (the
-  usual case), otherwise an empty string. It is informational (logging) only.
 * **Ping/Pong**: optional keepalive so idle control sessions survive NAT
   timeouts. The client pings periodically; the hub echoes the nonce.
 

client/client.go

@@ -221,8 +221,7 @@ func (c *Client) dispatchControl(payload []byte) {
 		pattern, _ := r.String()
 		ip, _ := r.String()
 		port, _ := r.U16()
-		username, _ := r.String()
+		go c.handleControlRequest(cid, pattern, ip, int(port))
-		go c.handleControlRequest(cid, pattern, ip, int(port), username)
 	case CtlPong:
 		// ignore
 	default:
@@ -248,13 +247,13 @@ func (c *Client) pingLoop(ctx context.Context, fc *wire.FramedConn) {
 
 // handleControlRequest reacts to a matched player: allocate a worker stream,
 // SYN it, and bridge it to the mapped destination.
-func (c *Client) handleControlRequest(cid []byte, pattern, ip string, port int, username string) {
+func (c *Client) handleControlRequest(cid []byte, pattern, ip string, port int) {
 	mapping, ok := c.mappings[NormalizeAddress(pattern)]
 	if !ok {
 		log.Printf("control-request for unmapped pattern %q; ignoring", pattern)
 		return
 	}
-	log.Printf("player %s:%d joined as %q via pattern %q -> %s", ip, port, username, pattern, mapping.Destination)
+	log.Printf("player %s:%d joined via pattern %q -> %s", ip, port, pattern, mapping.Destination)
 	wc, sid, err := c.pool.Allocate()
 	if err != nil {
 		log.Printf("worker allocate failed: %v", err)

docs/architecture.md

@@ -65,9 +65,9 @@ share a keystream beyond that first frame.
 ```
 Player            Hub                          Client                 Destination
   │─ Handshake(addr="mc.example.com", Intent=2)─▶ normalize + regex-match
-  │  (+ maybe pipelined Login Start)      │  pause player socket,
+  │                                       │  pause player socket,
   │                                       │  buffer bytes, mint CID
-  │                                       │─ ControlRequest(CID, pattern, ip:port, user) ─▶
+  │                                       │─ ControlRequest(CID, pattern, ip:port) ─▶
   │                                       │                          allocate worker+stream
   │                                       │◀──────── SYN(streamId, CID) ────────────│
   │                                       │  takePending(CID) → bind        dial destination,

server/src/main/java/io/icybear/redapricot/ControlSession.java

@@ -43,17 +43,16 @@ public final class ControlSession {
         }
     }
 
-    public void sendControlRequest(byte[] cid, String pattern, String playerIp, int playerPort, String username) {
+    public void sendControlRequest(byte[] cid, String pattern, String playerIp, int playerPort) {
         byte[] msg = new ProtoWriter()
                 .u8(Protocol.CTL_CONTROL_REQUEST)
                 .bytes(cid)
                 .string(pattern)
                 .string(playerIp)
                 .u16(playerPort)
-                .string(username)
                 .toBytes();
         frames.send(msg);
-        LOG.info("control-request pattern={} player={}:{} user={}", pattern, playerIp, playerPort, username);
+        LOG.info("control-request pattern={} player={}:{}", pattern, playerIp, playerPort);
     }
 
     private void sendRegisterAck(String pattern, int status) {

server/src/main/java/io/icybear/redapricot/HubConnection.java

@@ -106,7 +106,7 @@ public final class HubConnection {
             LOG.info("{} reserved intent 18; closing", id);
             socket.close();
         } else {
-            handlePlayer(address, intent, afterHandshake);
+            handlePlayer(address);
         }
     }
 
@@ -203,7 +203,7 @@ public final class HubConnection {
 
     // ---- player connection ----
 
-    private void handlePlayer(String address, int intent, Buffer afterHandshake) {
+    private void handlePlayer(String address) {
         String host = Hub.normalizeAddress(address);
         Hub.Match matched = hub.match(address);
         if (matched == null) {
@@ -219,9 +219,6 @@ public final class HubConnection {
         String cidHex = Hex.encode(cid);
         String ip = socket.remoteAddress() != null ? socket.remoteAddress().host() : "0.0.0.0";
         int port = socket.remoteAddress() != null ? socket.remoteAddress().port() : 0;
-        // Best-effort username: only login/transfer intents carry a Login Start, and only
-        // if the client pipelined it into this same buffer (the usual case).
-        String username = (intent == 2 || intent == 3) ? parseLoginName(afterHandshake) : "";
 
         socket.pause();
         Buffer buffered = hs.copy(); // handshake + any pipelined bytes, forwarded verbatim
@@ -230,27 +227,8 @@ public final class HubConnection {
         hub.addPending(p);
         closeCleanup = () -> hub.removePending(cidHex);
 
-        session.sendControlRequest(cid, pattern, ip, port, username);
+        session.sendControlRequest(cid, pattern, ip, port);
-        LOG.info("{} player {}:{} host '{}' user '{}' matched pattern '{}' cid={}",
+        LOG.info("{} player {}:{} host '{}' matched pattern '{}' cid={}",
-                id, ip, port, host, username, pattern, cidHex);
+                id, ip, port, host, pattern, cidHex);
-    }
-
-    /**
-     * Best-effort read of the player's username from a pipelined Login Start packet
-     * (Login state, packet id 0x00, first field {@code Name: String}). Returns "" if
-     * the packet is not (yet) fully present or does not parse as a Login Start; the hub
-     * never blocks waiting for it.
-     */
-    private static String parseLoginName(Buffer afterHandshake) {
-        if (afterHandshake == null || afterHandshake.length() == 0) return "";
-        try {
-            ProtoReader r = new ProtoReader(afterHandshake);
-            int pktLen = r.readVarInt();
-            if (pktLen <= 0 || pktLen > r.remaining()) return ""; // not fully buffered
-            if (r.readVarInt() != 0x00) return "";                // not a Login Start
-            return r.readString();
-        } catch (RuntimeException e) {
-            return "";
-        }
     }
 }