Introduction

FreeRADIUS uses a thread pool to serve requests. Each request is processed synchronously, and processing passes through a series of stages, and a list of modules in each stage.

The request is processed as follows

• The radius packet is received by a listener - see listen.c
• The radius packet is parsed and validated into a request - see ?
• The request is processed - see process.c
• The server passes through each authentication stage
  • authorize
  • if Proxy-To-Realm is set:
    • pre-proxy
    • send proxy request
    • post-proxy
  • else
    • authenticate
  • post-auth
• Authentication stages are lists of modules - see modcall.c