developping a custom authentication module

[MACHANI Ouahiba]

Hi,

I need to develop a custom authentication module to handle OTP
authentication and integrate it to Freeradius server. 

My questions are : 

1- are files with rlm_ prefix PAM modules or simply authentication
modules? 
2 - What should I write exactly other than an rlm_ file ? 
3- For a good beginning, what are the files that I should read first ?


thanks for your help.

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