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From Joe Lewis <>
Subject Re: modules + callbacks = ap_get_module_config(r->per_dir_config,var)
Date Fri, 26 Jan 2007 16:40:53 GMT
Mike wrote:
> Joe Lewis wrote:
>> Mike wrote:
>>> Hi,
>>> The Subject here may be completely wrong, so I will describe what I 
>>> am doing. Some years ago I hacked together an authentication module  
>>> which uses the c-client imap lib. I decided to take a look at 
>>> porting it to 2.0 only to realize that the code is complete 
>>> crap,thus I am looking to fix (Disclaimer, I am not a C Programmer).
>>> C-client is implemented such that it obtains data via callback 
>>> functions which must be defined by the caller. One of these  
>>> functions is to obtain the username and password to auth with. Since 
>>> this was a callback function I did not have any apache context handy 
>>> to store things in so I stuffed the user and password in globals. 
>>> This is obviously bad so I am looking to do it the correct way. My 
>>> current thought was to create some named shared memory segment in 
>>> the process pool to store this in and then maybe store the process 
>>> pool in a global. Reading/writing the user/pass pair to the pool 
>>> would be controlled by a mutex.
>>> On second thought though this isn't really that much different than 
>>> if I controlled access to the current globals with a mutex, there 
>>> must be a better way? Any advice/pointers appreciated.
>> Authentication in Apache 2.0 is actually very nicely engineered.  If 
>> you want to store the username and the password, you can.  However, 
>> you don't have to.
> Thanks for the reply.
> The problem is that I need access to this info in the callback 
> function, and the callback does not have access to the request_rec.
> For example..
> auth_basic_user(){
> do_some_stuff(); //Gets the user name and password(password as you 
> suggested) and stores them so that they can be used by later callback. 
> mm_login
> call_cclient_to_auth();
> return;
> }
> call_cclient_to_auth() takes no parms and eventually uses callback 
> functions to do things, one of these being to get the user/password to 
> auth with. This is by design of the c-client lib and not something I 
> can change.
PAM is very similar - it uses a callback.  However, it also uses a void 
pointer that gets passed in a setup function earlier.  Anything like 
that available?  (e.g. to call it with an r-> or a custom structure with 
the info?)


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