eap_sim_db_receive is not called

Ming-Ching Tiew mctiew at yahoo.com
Wed Sep 14 18:44:30 EDT 2011

--- On Wed, 9/14/11, Jouni Malinen <j at w1.fi> wrote:

> This works just fine when using hostapd as the EAP/RADIUS
> server, so I'm
> assuming you are talking about using libeap.so in some
> other context.
> > Likely eloop is not initialized correctly but I have
> called eloop_init() and eloop_run() in the initialization,
> but yet eloop mechanism inside eap_sim_db does not seem to
> be working.
> > 
> > Is there any other functions which I must also call to
> startup the eloop properly ?
> eloop_init() and eloop_run() are the key functions. In
> addition,
> eap_sim_db.c needs to register the read socket with
> eloop_register_read_sock().
> Are you sure that eloop_run() is running? How is eloop
> integrated with
> whatever program you are using to run libeap.so?

OK I have found out why. Two points :-

1. Basically if one calls eloop_run() early, when there is 
   nothing registered, then the function runs to completion 
   and exited. So it was as good as not called.

2. eloop_run() is a blocking function when something is registered,
   so in the hostapd code it daemonized everything else and keep
   its main thread to  service eloop_run(). Which means when I
   used it in libeap.so I also have to provide a thread to service

After realizing the above I created a thread to service eloop_run()
AFTER eap_sim_db_receive() has been registered and now 
eap_sim_db_receive() called when there is data incoming. 

But I still failed to get the radius client to authenticate properly 
due to the PENDING reply behaviour - as I posted in freeradius maillist.

What I am not sure now is the purpose of the callback function in 
the context of using libeap.so for realtime radius client-server
authentication. Maybe I did not do this correctly and the caused 
the failed radius authentication.

I suspect because freeradius does not like the pending behaviour - so I
probably will look inside libeap.so to change the pending behaviour 
of eap_sim_db to a blocking one.


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