Creating freeRADIUS extensions (beginner)

[Tiberiu Breana]

Hello.
I'm doing my thesis project on advanced authentication techniques. I  want to 
use freeRADIUS to implement extensions regarding one or more of  the following:
1)Location-based authentication
2)Prepay codes for timed access
3)QoS parameters (allocate network resources according to the user's services)

Do you think these extensions are 'doable' for a beginner?
What are the major steps in implementing a new module? From what I've  
understood so far, I have to create a .c file and add some attributes to  the 
dictionary. Is implementing new message types difficult? (does the  finite-state 
machine need to be modified?)

Any advice/information/tips are greatly welcome. Thanks!
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