#ifndef _FS_CEPH_AUTH_H
#define _FS_CEPH_AUTH_H

#include <linux/ceph/types.h>
#include <linux/ceph/buffer.h>

/*
* Abstract interface for communicating with the authenticate module.
* There is some handshake that takes place between us and the monitor
* to acquire the necessary keys. These are used to generate an
* 'authorizer' that we use when connecting to a service (mds, osd).
*/

struct ceph_auth_client;
struct ceph_authorizer;

struct ceph_auth_handshake {
struct ceph_authorizer *authorizer;
void *authorizer_buf;
size_t authorizer_buf_len;
void *authorizer_reply_buf;
size_t authorizer_reply_buf_len;
};

struct ceph_auth_client_ops {
const char *name;

/*
* true if we are authenticated and can connect to
* services.
*/
int (*is_authenticated)(struct ceph_auth_client *ac);

/*
* true if we should (re)authenticate, e.g., when our tickets
* are getting old and crusty.
*/
int (*should_authenticate)(struct ceph_auth_client *ac);

/*
* build requests and process replies during monitor
* handshake. if handle_reply returns -EAGAIN, we build
* another request.
*/
int (*build_request)(struct ceph_auth_client *ac, void *buf, void *end);
int (*handle_reply)(struct ceph_auth_client *ac, int result,
void *buf, void *end);

/*
* Create authorizer for connecting to a service, and verify
* the response to authenticate the service.
*/
int (*create_authorizer)(struct ceph_auth_client *ac, int peer_type,
struct ceph_auth_handshake *auth);
/* ensure that an existing authorizer is up to date */
int (*update_authorizer)(struct ceph_auth_client *ac, int peer_type,
struct ceph_auth_handshake *auth);
int (*verify_authorizer_reply)(struct ceph_auth_client *ac,
struct ceph_authorizer *a, size_t len);
void (*destroy_authorizer)(struct ceph_auth_client *ac,
struct ceph_authorizer *a);
void (*invalidate_authorizer)(struct ceph_auth_client *ac,
int peer_type);

/* reset when we (re)connect to a monitor */
void (*reset)(struct ceph_auth_client *ac);

void (*destroy)(struct ceph_auth_client *ac);
};

struct ceph_auth_client {
u32 protocol; /* CEPH_AUTH_* */
void *private; /* for use by protocol implementation */
const struct ceph_auth_client_ops *ops; /* null iff protocol==0 */

bool negotiating; /* true if negotiating protocol */
const char *name; /* entity name */
u64 global_id; /* our unique id in system */
const struct ceph_crypto_key *key; /* our secret key */
unsigned want_keys; /* which services we want */

struct mutex mutex;
};

extern struct ceph_auth_client *ceph_auth_init(const char *name,
const struct ceph_crypto_key *key);
extern void ceph_auth_destroy(struct ceph_auth_client *ac);

extern void ceph_auth_reset(struct ceph_auth_client *ac);

extern int ceph_auth_build_hello(struct ceph_auth_client *ac,
void *buf, size_t len);
extern int ceph_handle_auth_reply(struct ceph_auth_client *ac,
void *buf, size_t len,
void *reply_buf, size_t reply_len);
extern int ceph_entity_name_encode(const char *name, void **p, void *end);

extern int ceph_build_auth(struct ceph_auth_client *ac,
void *msg_buf, size_t msg_len);

extern int ceph_auth_is_authenticated(struct ceph_auth_client *ac);
extern int ceph_auth_create_authorizer(struct ceph_auth_client *ac,
int peer_type,
struct ceph_auth_handshake *auth);
extern void ceph_auth_destroy_authorizer(struct ceph_auth_client *ac,
struct ceph_authorizer *a);
extern int ceph_auth_update_authorizer(struct ceph_auth_client *ac,
int peer_type,
struct ceph_auth_handshake *a);
extern int ceph_auth_verify_authorizer_reply(struct ceph_auth_client *ac,
struct ceph_authorizer *a,
size_t len);
extern void ceph_auth_invalidate_authorizer(struct ceph_auth_client *ac,
int peer_type);

#endif