/* 
 * snmpusm.h
 *
 * Header file for USM support.
 */

#ifndef SNMPUSM_H
#define SNMPUSM_H

#ifdef __cplusplus
extern "C" {
#endif

#define WILDCARDSTRING "*"

/*
 * General.
 */
#define USM_MAX_ID_LENGTH		1024		/* In bytes. */
#define USM_MAX_SALT_LENGTH		64		/* In BITS. */
#define USM_MAX_KEYEDHASH_LENGTH	128		/* In BITS. */

#define USM_TIME_WINDOW			150
#define USM_MD5_AND_SHA_AUTH_LEN        12              /* bytes */
#define USM_MAX_AUTHSIZE                USM_MD5_AND_SHA_AUTH_LEN


/*
 * Structures.
 */
struct usmStateReference {
	char		*usr_name;
	size_t		 usr_name_length;
	u_char		*usr_engine_id;
	size_t		 usr_engine_id_length;
	oid		*usr_auth_protocol;
	size_t		 usr_auth_protocol_length;
	u_char		*usr_auth_key;
	size_t		 usr_auth_key_length;
	oid		*usr_priv_protocol;
	size_t		 usr_priv_protocol_length;
	u_char		*usr_priv_key;
	size_t		 usr_priv_key_length;
	u_int		 usr_sec_level;
};


/* struct usmUser: a structure to represent a given user in a list */
/* Note: Any changes made to this structure need to be reflected in
   the following functions: */

struct usmUser;
struct usmUser {
   u_char         *engineID;
   size_t          engineIDLen;
   char           *name;
   char           *secName;
   oid            *cloneFrom;
   size_t          cloneFromLen;
   oid            *authProtocol;
   size_t          authProtocolLen;
   u_char         *authKey;
   size_t          authKeyLen;
   oid            *privProtocol;
   size_t          privProtocolLen;
   u_char         *privKey;
   size_t          privKeyLen;
   u_char         *userPublicString;
   int             userStatus;
   int             userStorageType;
   struct usmUser *next;
   struct usmUser *prev;
};



/*
 * Prototypes.
 */
struct usmStateReference *
	usm_malloc_usmStateReference (void);

void	usm_free_usmStateReference (void *old);

int	usm_set_usmStateReference_name (
		struct usmStateReference	*ref,
		char				*name,
		size_t				 name_len);

int	usm_set_usmStateReference_engine_id (
		struct usmStateReference	*ref,
		u_char				*engine_id,
		size_t				 engine_id_len);

int	usm_set_usmStateReference_auth_protocol (
		struct usmStateReference *ref,
		oid *auth_protocol,
		size_t auth_protocol_len);

int	usm_set_usmStateReference_auth_key (
		struct usmStateReference *ref,
		u_char *auth_key,
		size_t auth_key_len);

int	usm_set_usmStateReference_priv_protocol (
		struct usmStateReference *ref,
		oid *priv_protocol,
		size_t priv_protocol_len);

int	usm_set_usmStateReference_priv_key (
		struct usmStateReference *ref,
		u_char *priv_key,
		size_t priv_key_len);

int	usm_set_usmStateReference_sec_level (
		struct usmStateReference *ref,
		int sec_level);

#ifdef SNMP_TESTING_CODE
void	emergency_print (u_char *field, u_int length);
#endif

int	asn_predict_int_length (int type, long number, size_t len);

int	asn_predict_length (int type, u_char *ptr, size_t u_char_len);

int	usm_set_salt (
		u_char		*iv,
		size_t		*iv_length,
		u_char		*priv_salt,
		size_t		 priv_salt_length,
		u_char		*msgSalt );

int	usm_parse_security_parameters (
		u_char  *secParams,
		size_t   remaining,
		u_char  *secEngineID,
		size_t  *secEngineIDLen,
		u_int   *boots_uint,
		u_int   *time_uint,
		char    *secName,
		size_t  *secNameLen,
		u_char  *signature,
		size_t  *signature_length,
		u_char  *salt,
		size_t  *salt_length,
		u_char **data_ptr);

int	usm_check_and_update_timeliness (
		u_char *secEngineID,
		size_t  secEngineIDLen,
		u_int   boots_uint,
		u_int   time_uint,
		int    *error);

int usm_generate_out_msg (int, u_char *, size_t, int, int, u_char *, size_t,
			      char *,  size_t, int, u_char *, size_t, void *,
			      u_char *, size_t *, u_char **, size_t *);
int usm_rgenerate_out_msg (int, u_char *, size_t, int, int, u_char *, size_t,
                           char *,  size_t, int, u_char *, size_t, void *,
                           u_char *, size_t *);

int usm_process_in_msg (int, size_t, u_char *, int, int, u_char *, size_t,
			    u_char *, size_t *, char *, size_t *, u_char **, size_t *,
			    size_t *, void **, struct snmp_session *, u_char);

int             usm_check_secLevel(int level, struct usmUser *user);
struct usmUser *usm_get_userList(void);
struct usmUser *usm_get_user(u_char *engineID, size_t engineIDLen, char *name);
struct usmUser *usm_get_user_from_list(u_char *engineID, size_t engineIDLen,
                                       char *name, struct usmUser *userList,
                                       int use_default);
struct usmUser *usm_add_user(struct usmUser *user);
struct usmUser *usm_add_user_to_list(struct usmUser *user,
                                     struct usmUser *userList);
struct usmUser *usm_free_user(struct usmUser *user);
struct usmUser *usm_create_user(void);
struct usmUser *usm_create_initial_user(const char *name,
                                     oid *authProtocol, size_t authProtocolLen,
                                     oid *privProtocol, size_t privProtocolLen);
struct usmUser *usm_cloneFrom_user(struct usmUser *from, struct usmUser *to);
struct usmUser *usm_remove_user(struct usmUser *user);
struct usmUser *usm_remove_user_from_list(struct usmUser *user,
                                          struct usmUser **userList);
char           *get_objid(char *line, oid **optr, size_t *len);
void            usm_save_users(const char *token, const char *type);
void            usm_save_users_from_list(struct usmUser *user, const char *token,
                                        const char *type);
void            usm_save_user(struct usmUser *user, const char *token, const char *type);
SNMPCallback    usm_store_users;
struct usmUser *usm_read_user(char *line);
void            usm_parse_config_usmUser(const char *token, char *line);

void            usm_set_password(const char *token, char *line);
void            usm_set_user_password(struct usmUser *user, const char *token,
                                      char *line);
void		init_usm(void);
int		init_usm_post_config(int majorid, int minorid, void *serverarg,
                                     void *clientarg);

#ifdef __cplusplus
}
#endif

#endif /* SNMPUSM_H */