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我想测试大量 IP 以寻找开放的 DNS 解析器。我正在尝试找到最有效的方法来并行化它。目前我正试图通过扭曲来实现这一点。我希望有 10 或 20 个并行线程发送查询以避免阻塞槽超时。

Twisted 有一个似乎合适的 DNSDatagramProtocol，但我只是不知道如何将它与扭曲的“反应器”和“线程”设施组合在一起以使其高效运行。

我阅读了很多扭曲的文档，但我仍然不确定什么是最好的方法。

有人可以举例说明如何实现吗？

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2 回答 2

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这是一个演示 Twisted Names API 的快速示例：

from sys import argv
from itertools import cycle
from pprint import pprint

from twisted.names import client
from twisted.internet.task import react
from twisted.internet.defer import gatherResults, inlineCallbacks

def query(reactor, server, name):
    # Create a new resolver that uses the given DNS server
    resolver = client.Resolver(
        resolv="/dev/null", servers=[(server, 53)], reactor=reactor)
    # Use it to do an A request for the name
    return resolver.lookupAddress(name)

@inlineCallbacks
def main(reactor, *names):
    # Here's some random DNS servers to which to issue requests.
    servers = ["4.2.2.1", "8.8.8.8"]

    # Handy trick to cycle through those servers forever
    next_server = cycle(servers).next

    # Issue queries for all the names given, alternating between servers.
    results = []
    for n in names:
        results.append(query(reactor, next_server(), n))
    # Wait for all the results
    results = yield gatherResults(results)
    # And report them
    pprint(zip(names, results))

if __name__ == '__main__':
    # Run the main program with the reactor going and pass names
    # from the command line arguments to be resolved
    react(main, argv[1:])
于 2013-04-03T15:43:47.347 回答
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尝试 gevent，生成许多 greenlet 来进行 DNS 解析。gevent 也有一个不错的 DNS 解析 API：http ://www.gevent.org/gevent.dns.html

他们甚至有一个例子： https ://github.com/gevent/gevent/blob/master/examples/dns_mass_resolve.py

于 2013-04-03T14:31:13.927 回答