Here are the data structures with brief descriptions:

Ccontext_data_t	XML context
Ccredentials_t	A username password pair
Ccvss	Describe a CVSS metrics
Ccvss4_macrovector_mapping_t	Key-Value mappings of CVSS 4.0 macrovectors to scores
Ccvss4_metric_def_t	String to enum mapping and allowed values for a CVSS 4.0 metric
Centity_s	XML element
Cgmp_authenticate_info_opts_t	Struct holding options for authentication
Cgmp_create_lsc_credential_opts_t	Struct holding options for gmp create_lsc_credential command
Cgmp_create_target_opts_t	Struct holding options for gmp create_target command
Cgmp_create_task_opts_t	Struct holding options for gmp create_task command
Cgmp_delete_opts_t	Struct holding options for various gmp delete_[...] commands
Cgmp_get_report_opts_t	Struct holding options for gmp get_report command
Cgmp_get_system_reports_opts_t	Struct holding options for gmp get_system_reports command
Cgmp_get_task_opts_t	Struct holding options for gmp get_tasks command
Cgmp_get_tasks_opts_t	Struct holding options for gmp get_tasks command
Cgmp_start_task_opts_t	Struct holding options for gmp start_task command
Cgvm_connection_t	Connection
Cgvm_host	The structure for a single host object
Cgvm_hosts	The structure for Hosts collection
Cgvm_logging_t	Logging stores the parameters loaded from a log configuration
Cgvm_vhost	The structure for a single vhost object
Cimpact_item	Describe a CVSS impact element
Ckb	Top-level KB. This is to be inherited by KB implementations
Ckb_item	Knowledge base item (defined by name, type (int/char*) and value). Implemented as a singly linked list
Ckb_operations	KB interface. Functions provided by an implementation. All functions have to be provided, there is no default/fallback. These functions should be called via the corresponding static inline wrappers below. See the wrappers for the documentation
Ckb_redis	Subclass of struct kb, it contains the redis-specific fields, such as the redis context, current DB (namespace) id and the server socket path
Cldap_auth_info	Schema (dn) and info to use for a basic ldap authentication
Cmqtt_t
Cnvti	The structure of a information record that corresponds to a NVT
Cnvtpref	The structure for a preference of a NVT
Cosp_connection	Struct holding options for OSP connection
Cosp_credential	Struct credential information for OSP
Cosp_get_performance_opts_t
Cosp_get_scan_status_opts_t
Cosp_get_vts_opts_t
Cosp_param	Struct holding options for OSP parameters
Cosp_start_scan_opts_t
Cosp_target	Struct holding target information
Cosp_vt_group	Struct holding vt_group information
Cosp_vt_single	Struct holding vt_group information
CPBASettings
Crange	A port range
Croute_entry
Csettings_iterator_t	Struct holding options to iterate over a GKeyFile
Csettings_t	Struct holding options for settings taken from a key-value config file
Cvtref	The structure for a cross reference of a VT
Cvtseverity	The structure for a severity of a VT
Cxml_file_iterator_struct	Opaque data structure for XML file iterator
Cxml_search_data_t	Data for xml search functions