Here are the data structures with brief descriptions:

Ccmd_response_data	Response information for commands
Ccredentials	Structure of credential related information
Cfind_by_value_t	Structure to search a key by value
Cgsad_connection_info	Connection information
Chttp_handler
Cmethod_router
Cparam	Request parameter
Curl_map	URL regexp to handler function mapping
Cuser	User information structure, for sessions
Cvalidator_rule	A validator rule