如何从DHT中获取种子文件？

Question

我写了一个简单的脚本，用于查找给定info_hash的示例对等IP。我在BEP-0005中没有看到这种信息：我该如何从DHT中获取种子文件？

- d33tah

Answer 1

DHT不提供种子文件，它只为个别infohash提供对等列表。种子文件或不可变的信息字典是由bittorrent群体自己提供的。

您需要部分实现BEP3，BEP10和最终BEP9以执行元数据交换。此外，实施BEP29和BEP11可能提供改进的连接性，在检索小型群集上的元数据时非常有用。

其次，消耗DHT资源而未提供任何资源，或反复向节点发送请求——特别是引导节点——被视为不礼貌的行为。如果您打算获取大量种子文件，应该作为守护进程运行DHT节点，例如通过Juliusz Chroboczek的dht lib（C语言）或mine（Java语言）。我的实现还包含元数据检索服务。libtorrent也应该提供了实现相同功能所需的所有必要部分。

- the8472

Answer 2

这里有一个base64编码的.pcap文件，展示了完整的通信过程（注意最后一个数据包）。解码并在Wireshark中打开它将会展示完整的过程 - 结合the8472答案中列出的BEPs，这可以作为一个例子。

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- d33tah