Ignore expected IVs that arrive by the wrong transport.

This prevents an attacker from replaying connections to test whether a
transport endpoint has the same owner as an endpoint on another
transport (eg probing a Bluetooth device to see whether it has the
same owner as a given internet host).

api/net/sf/briar/api/transport/ConnectionRecogniser.java

@@ -1,6 +1,7 @@
 package net.sf.briar.api.transport;
 
 import net.sf.briar.api.db.DbException;
+import net.sf.briar.api.protocol.TransportId;
 
 /**
  * Maintains the connection reordering windows and decides whether incoming
@@ -12,5 +13,6 @@ public interface ConnectionRecogniser {
 	 * Returns the connection's context if the connection should be accepted,
 	 * or null if the connection should be rejected.
 	 */
-	ConnectionContext acceptConnection(byte[] encryptedIv) throws DbException;
+	ConnectionContext acceptConnection(TransportId t, byte[] encryptedIv)
+	throws DbException;
 }