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From Ben Noordhuis <>
Subject Re: Shared memory ?
Date Mon, 15 Nov 2010 17:43:30 GMT
On Mon, Nov 15, 2010 at 17:12, Rémy Sanchez <> wrote:
> I'm coding a module to somehow replace/complement mod_security (it's more a
> proof of concept than a real project for now). The first thing that I'd like
> to have is a DNSBL, so that detected intruders are instantly banned when
> added to the blacklist. Because doing a DNS query for each HTTP request
> might be a bit heavy, I'd like to keep the results in cache.

The stuff in apr_shm.h is what you want.

> I guess that if I create something from the config pool, it will be
> duplicated between processes. But another security I want is to check URL
> against regexps commonly used by botnets/script kiddies. Then, if an IP is
> blacklisted, I want its state to be changed instantly in all caches. Which,
> if data is duplicated, is not possible. Would there be a simple way to
> achieve this ? Or would it be more clever to move to another solution, like
> using a common redis datastore for blacklist/whitelist/rules lookup ?

I would probably take this direction (store it in a database,
relational or otherwise). Works across multiple nodes and is
scriptable from outside.

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