@Nullable
    public Session query(short localPort) {
        Session session = mSessions.get(localPort);
        if (mDumper != null && session != null && session.uid == 0) {
            // Query uid again.
            mDumper.request(session);
        }
        return session;
    }
Query a session by local VPN port.

@param localPort The local VPN port.
@return The instance of {@link Session} if it exists, or null.
netbare-core/src/main/java/com/github/megatronking/netbare/net/SessionProvider.java