mina prefixedDataAvailable

最新推荐文章于 2024-04-19 11:51:33 发布

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MINA框架中的prefixedDataAvailable方法存在潜在DoS攻击风险，当远程对等方发送过大的数据长度值时，可能导致服务拒绝。默认配置下，该方法对数据长度的上限为MaxInt，等同于无限制地发送数据。

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mina prefixedDataAvailable：

not that using this method can allow DoS (Denial of Service) attack in case the remote peer sends too big data length value.
意思是说要注意数据太大问题，默认方法是MaxInt上限，相当于没有限制长度的发送。

    /**
     * Returns <tt>true</tt> if this buffer contains a data which has a data
     * length as a prefix and the buffer has remaining data as enough as
     * specified in the data length field. This method is identical with
     * <tt>prefixedDataAvailable( prefixLength, Integer.MAX_VALUE )</tt>. Please
     * not that using this method can allow DoS (Denial of Service) attack in
     * case the remote peer sends too big data length value. It is recommended
     * to use {@link #prefixedDataAvailable(int, int)} instead.
     * 
     * @param prefixLength
     *            the length of the prefix field (1, 2, or 4)
     * 
     * @throws IllegalArgumentException
     *             if prefixLength is wrong
     * @throws BufferDataException
     *             if data length is negative
     */
    public abstract boolean prefixedDataAvailable(int prefixLength);

    /**
     * Returns <tt>true</tt> if this buffer contains a data which has a data
     * length as a prefix and the buffer has remaining data as enough as
     * specified in the data length field.
     * 
     * @param prefixLength
     *            the length of the prefix field (1, 2, or 4)
     * @param maxDataLength
     *            the allowed maximum of the read data length
     * 
     * @throws IllegalArgumentException
     *             if prefixLength is wrong
     * @throws BufferDataException
     *             if data length is negative or greater then
     *             <tt>maxDataLength</tt>
     */
    public abstract boolean prefixedDataAvailable(int prefixLength, int maxDataLength);