Method forward

src/main/java/org/example/Socks5Server.java:234–251

(SocketChannel source, SocketChannel destination)

    }

    private void forward(SocketChannel source, SocketChannel destination) {
        ByteBuffer buffer = ByteBuffer.allocate(8192);
        try {
            while (source.isOpen() && destination.isOpen()) {
                buffer.clear();
                int read = source.read(buffer);
                if (read == -1) {
                    break;
                }
                buffer.flip();
                writeFully(destination, buffer);
            }
        } catch (IOException e) {
            // 连接已断开，关闭通道
            closeQuietly(source);
            closeQuietly(destination);
        }
    }

    private void sendResponse(SocketChannel channel, byte status) throws IOException {
        ByteBuffer response = ByteBuffer.allocate(10);