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From Ferdinand Arndt <ferdinand.ar...@axiros.com>
Subject Re: Reading request body an writing it back to the chain
Date Mon, 15 Dec 2008 11:30:44 GMT

On Dec 15, 2008, at 12:10 PM, Ivan Ristic wrote:

> You can look at how ModSecurity (http://www.modsecurity.org) does it:
> you can read the request body and store it somewhere, then you insert
> and input filter that sends data from the buffer down the chain and
> removes itself from the chain once it's done.
>
> You can choose where you're reading the request body. In a pure-filter
> approach you will read it on the first invocation. Alternatively, you
> can read it in a hook, but store it somewhere where your filter will
> find it. In the latter case, the purpose of the filter will be only to
> pass on the data in your buffer.

Ok, thank you, I'll have a look at it. So my inputfilter has to be  
executed before any other input filter runs.

>
> By the way, ModSecurity can already do what you're describing.

Unfortunately, I have to perform also database lookups and use this  
data in my regex, so I unfortunately have to do it by myself :(

>
>
>
> On Mon, Dec 15, 2008 at 11:04 AM, Ferdinand Arndt
> <ferdinand.arndt@axiros.com> wrote:
>> Hi,
>>
>> I am trying to make a module that does the following:
>>
>> 1. Reading the request body
>> 2. Checking the data with some regex
>> 3. Setting some environment variables
>>
>> The environment variables are for later processing with mod_rewrite.
>>
>> My problem is, how to write the content of the request back to the  
>> chain, so
>> that it can be used later again in other modules or can be forwared  
>> to
>> another server with mod_rewrite/mod_proxy.
>>
>> My first approach is to do it all in an input filter, but as far as I
>> understand it, the filter is only active, if I read the content in  
>> another
>> hook outside the filter. So how can I read the data and write it  
>> back?
>>
>> /Regards,
>>
>> Ferdinand
>>
>>
>>
>>
>>
>>
>
>
>
> -- 
> Ivan Ristic







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