dynamic data structure in my owm freeradius module

Hi, I'm trying to write my own module for freeradius. I'd like to use a configuration file where i save some recursive structure. eg: module_name <module_name> { var1 = val1 var2 = val2 subsection1 subsection1_name { var1_1 = val1_1 var1_2 = val1_2 } .... .... subsectionN subsectionN_name { varN_1 = valN_1 varN_2 = valN_2 } } I'm trying to realize a more simple data structure first, with only one subsection. An example: http://pastebin.com/JYfh3BuK but i have a segfault. Someone can help me with this implementation. Should i use PW_TYPE_SUBSECTION in the main module_config[] structure? How can i manage the case where there are N subsection of the same type? Thanks