/*
 * Server side of OSPF API.
 * Copyright (C) 2001, 2002 Ralph Keller
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef _OSPF_APISERVER_H
#define _OSPF_APISERVER_H

/* MTYPE definition is not reflected to "memory.h". */
#define MTYPE_OSPF_APISERVER MTYPE_TMP
#define MTYPE_OSPF_APISERVER_MSGFILTER MTYPE_TMP

/* List of opaque types that application registered */
struct registered_opaque_type {
	uint8_t lsa_type;
	uint8_t opaque_type;
};


/* Server instance for each accepted client connection. */
struct ospf_apiserver {
	/* Socket connections for synchronous commands and asynchronous
	   notifications */
	int fd_sync; /* synchronous requests */
	struct sockaddr_in peer_sync;

	int fd_async; /* asynchronous notifications */
	struct sockaddr_in peer_async;

	/* List of all opaque types that application registers to use. Using
	   a single connection with the OSPF daemon, multiple
	   <lsa,opaque_type> pairs can be registered. However, each
	   combination can only be registered once by all applications. */
	struct list *opaque_types; /* of type registered_opaque_type */

	/* Temporary storage for LSA instances to be refreshed. */
	struct ospf_lsdb reserve;

	/* filter for LSA update/delete notifies */
	struct lsa_filter_type *filter;

	/* Fifo buffers for outgoing messages */
	struct msg_fifo *out_sync_fifo;
	struct msg_fifo *out_async_fifo;

	/* Read and write threads */
	struct thread *t_sync_read;
#ifdef USE_ASYNC_READ
	struct thread *t_async_read;
#endif /* USE_ASYNC_READ */
	struct thread *t_sync_write;
	struct thread *t_async_write;
};

enum event {
	OSPF_APISERVER_ACCEPT,
	OSPF_APISERVER_SYNC_READ,
#ifdef USE_ASYNC_READ
	OSPF_APISERVER_ASYNC_READ,
#endif /* USE_ASYNC_READ */
	OSPF_APISERVER_SYNC_WRITE,
	OSPF_APISERVER_ASYNC_WRITE
};

/* -----------------------------------------------------------
 * Followings are functions to manage client connections.
 * -----------------------------------------------------------
 */

extern unsigned short ospf_apiserver_getport(void);
extern int ospf_apiserver_init(void);
extern void ospf_apiserver_term(void);
extern struct ospf_apiserver *ospf_apiserver_new(int fd_sync, int fd_async);
extern void ospf_apiserver_free(struct ospf_apiserver *apiserv);
extern void ospf_apiserver_event(enum event event, int fd,
				 struct ospf_apiserver *apiserv);
extern int ospf_apiserver_serv_sock_family(unsigned short port, int family);
extern int ospf_apiserver_accept(struct thread *thread);
extern int ospf_apiserver_read(struct thread *thread);
extern int ospf_apiserver_sync_write(struct thread *thread);
extern int ospf_apiserver_async_write(struct thread *thread);
extern int ospf_apiserver_send_reply(struct ospf_apiserver *apiserv,
				     uint32_t seqnr, uint8_t rc);

/* -----------------------------------------------------------
 * Followings are message handler functions
 * -----------------------------------------------------------
 */

extern int ospf_apiserver_lsa9_originator(void *arg);
extern int ospf_apiserver_lsa10_originator(void *arg);
extern int ospf_apiserver_lsa11_originator(void *arg);

extern void ospf_apiserver_clients_notify_all(struct msg *msg);

extern void
ospf_apiserver_clients_notify_ready_type9(struct ospf_interface *oi);
extern void ospf_apiserver_clients_notify_ready_type10(struct ospf_area *area);
extern void ospf_apiserver_clients_notify_ready_type11(struct ospf *top);

extern void ospf_apiserver_clients_notify_new_if(struct ospf_interface *oi);
extern void ospf_apiserver_clients_notify_del_if(struct ospf_interface *oi);
extern void ospf_apiserver_clients_notify_ism_change(struct ospf_interface *oi);
extern void ospf_apiserver_clients_notify_nsm_change(struct ospf_neighbor *nbr);

extern int ospf_apiserver_is_ready_type9(struct ospf_interface *oi);
extern int ospf_apiserver_is_ready_type10(struct ospf_area *area);
extern int ospf_apiserver_is_ready_type11(struct ospf *ospf);

extern void ospf_apiserver_notify_ready_type9(struct ospf_apiserver *apiserv);
extern void ospf_apiserver_notify_ready_type10(struct ospf_apiserver *apiserv);
extern void ospf_apiserver_notify_ready_type11(struct ospf_apiserver *apiserv);

extern int ospf_apiserver_handle_msg(struct ospf_apiserver *apiserv,
				     struct msg *msg);
extern int
ospf_apiserver_handle_register_opaque_type(struct ospf_apiserver *apiserv,
					   struct msg *msg);
extern int
ospf_apiserver_handle_unregister_opaque_type(struct ospf_apiserver *apiserv,
					     struct msg *msg);
extern int ospf_apiserver_handle_register_event(struct ospf_apiserver *apiserv,
						struct msg *msg);
extern int
ospf_apiserver_handle_originate_request(struct ospf_apiserver *apiserv,
					struct msg *msg);
extern int ospf_apiserver_handle_delete_request(struct ospf_apiserver *apiserv,
						struct msg *msg);
extern int ospf_apiserver_handle_sync_lsdb(struct ospf_apiserver *apiserv,
					   struct msg *msg);


/* -----------------------------------------------------------
 * Followings are functions for LSA origination/deletion
 * -----------------------------------------------------------
 */

extern int ospf_apiserver_register_opaque_type(struct ospf_apiserver *apiserver,
					       uint8_t lsa_type,
					       uint8_t opaque_type);
extern int
ospf_apiserver_unregister_opaque_type(struct ospf_apiserver *apiserver,
				      uint8_t lsa_type, uint8_t opaque_type);
extern struct ospf_lsa *
ospf_apiserver_opaque_lsa_new(struct ospf_area *area, struct ospf_interface *oi,
			      struct lsa_header *protolsa);
extern struct ospf_interface *
ospf_apiserver_if_lookup_by_addr(struct in_addr address);
extern struct ospf_interface *
ospf_apiserver_if_lookup_by_ifp(struct interface *ifp);
extern int ospf_apiserver_originate1(struct ospf_lsa *lsa);
extern void ospf_apiserver_flood_opaque_lsa(struct ospf_lsa *lsa);


/* -----------------------------------------------------------
 * Followings are callback functions to handle opaque types
 * -----------------------------------------------------------
 */

extern int ospf_apiserver_new_if(struct interface *ifp);
extern int ospf_apiserver_del_if(struct interface *ifp);
extern void ospf_apiserver_ism_change(struct ospf_interface *oi,
				      int old_status);
extern void ospf_apiserver_nsm_change(struct ospf_neighbor *nbr,
				      int old_status);
extern void ospf_apiserver_config_write_router(struct vty *vty);
extern void ospf_apiserver_config_write_if(struct vty *vty,
					   struct interface *ifp);
extern void ospf_apiserver_show_info(struct vty *vty, struct ospf_lsa *lsa);
extern int ospf_ospf_apiserver_lsa_originator(void *arg);
extern struct ospf_lsa *ospf_apiserver_lsa_refresher(struct ospf_lsa *lsa);
extern void ospf_apiserver_flush_opaque_lsa(struct ospf_apiserver *apiserv,
					    uint8_t lsa_type,
					    uint8_t opaque_type);

/* -----------------------------------------------------------
 * Followings are hooks when LSAs are updated or deleted
 * -----------------------------------------------------------
 */


/* Hooks that are invoked from ospf opaque module */

extern int ospf_apiserver_lsa_update(struct ospf_lsa *lsa);
extern int ospf_apiserver_lsa_delete(struct ospf_lsa *lsa);

extern void ospf_apiserver_clients_lsa_change_notify(uint8_t msgtype,
						     struct ospf_lsa *lsa);

#endif /* _OSPF_APISERVER_H */