[Haskell] Re: [Haskell-cafe] ANNOUNCE: enumerator, an alternative
magnus at therning.org
Fri Aug 20 15:52:21 EDT 2010
On 20/08/10 17:30, Felipe Lessa wrote:
> On Fri, Aug 20, 2010 at 1:12 PM, John Millikin <jmillikin at gmail.com> wrote:
>> This thought occurred to me, but really, how often are you going to
>> have a 10 GiB **text** file with no newlines? Remember, this is for
>> text (log files, INI-style configs, plain .txt), not binary (HTML,
>> XML, JSON). Off the top of my head, I can't think of any case where
>> you'd expect to see 10 GiB in a single line.
>> In the worst case, you can just use "decode" to process bytes coming
>> from the ByteString-based enumHandle, which should give nicely chunked
> I was thinking about an attacker, not a use case. Think of a web
> server accepting queries using iteratees internally. This may open
> door to at least DoS attacks.
You don't need to send that much data, the current implementation of
Enumerator uses hGet, which blocks, so just send the server a few bytes and
it'll be sitting there waiting for input until it times out (if ever).
few hundred of those connections and you're likely to cause the server
out of FDs. Of course this is already coded up in tools like
Magnus Therning (OpenPGP: 0xAB4DFBA4)
magnus＠therning．org Jabber: magnus＠therning．org
http://therning.org/magnus identi.ca|twitter: magthe
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