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/**

 * @file

 * Generic MIB tree structures.

 *

 * @todo namespace prefixes

 */

/*

 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

 * OF SUCH DAMAGE.

 *

 * Author: Christiaan Simons <christiaan.simons@axon.tv>

 */

#ifndef __LWIP_SNMP_STRUCTS_H__

#define __LWIP_SNMP_STRUCTS_H__

#include "lwip/opt.h"

#if LWIP_SNMP

#include "arch/cc.h"

#include "lwip/snmp.h"

#if SNMP_PRIVATE_MIB

#include "private_mib.h"

#endif

/* MIB object instance */

#define MIB_OBJECT_NONE 0 

#define MIB_OBJECT_SCALAR 1

#define MIB_OBJECT_TAB 2

/* MIB object access */

#define MIB_OBJECT_READ_ONLY 0

#define MIB_OBJECT_READ_WRITE 1

#define MIB_OBJECT_WRITE_ONLY 2

#define MIB_OBJECT_NOT_ACCESSIBLE 3

/** object definition returned by (get_object_def)() */

struct obj_def

{

  /* MIB_OBJECT_NONE (0), MIB_OBJECT_SCALAR (1), MIB_OBJECT_TAB (2) */

  u8_t instance;

  /* 0 read-only, 1 read-write, 2 write-only, 3 not-accessible */

  u8_t access;

  /* ASN type for this object */

  u8_t asn_type;

  /* value length (host length) */

  u16_t v_len;

  /* length of instance part of supplied object identifier */

  u8_t  id_inst_len;

  /* instance part of supplied object identifier */

  s32_t *id_inst_ptr;

};

struct snmp_name_ptr

{

  u8_t ident_len;

  s32_t *ident;

};

/** MIB const scalar (.0) node */

#define MIB_NODE_SC 0x01

/** MIB const array node */

#define MIB_NODE_AR 0x02

/** MIB array node (mem_malloced from RAM) */

#define MIB_NODE_RA 0x03

/** MIB list root node (mem_malloced from RAM) */

#define MIB_NODE_LR 0x04

/** MIB node for external objects */

#define MIB_NODE_EX 0x05

/** node "base class" layout, the mandatory fields for a node  */

struct mib_node

{

  /** returns struct obj_def for the given object identifier */

  void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);

  /** returns object value for the given object identifier,

     @note the caller must allocate at least len bytes for the value */

  void (*get_value)(struct obj_def *od, u16_t len, void *value);

  /** tests length and/or range BEFORE setting */

  u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);

  /** sets object value, only to be called when set_test()  */

  void (*set_value)(struct obj_def *od, u16_t len, void *value);

  /** One out of MIB_NODE_AR, MIB_NODE_LR or MIB_NODE_EX */

  const u8_t node_type;

  /* array or max list length */

  const u16_t maxlength;

};

/** derived node for scalars .0 index */

typedef struct mib_node mib_scalar_node;

/** derived node, points to a fixed size const array

    of sub-identifiers plus a 'child' pointer */

struct mib_array_node

{

  /* inherited "base class" members */

  void (* const get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);

  void (* const get_value)(struct obj_def *od, u16_t len, void *value);

  u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);

  void (*set_value)(struct obj_def *od, u16_t len, void *value);

  const u8_t node_type;

  const u16_t maxlength;

  /* aditional struct members */

  const s32_t *objid;

  struct mib_node* const *nptr;

};

/** derived node, points to a fixed size mem_malloced array

    of sub-identifiers plus a 'child' pointer */

struct mib_ram_array_node

{

  /* inherited "base class" members */

  void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);

  void (*get_value)(struct obj_def *od, u16_t len, void *value);

  u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);

  void (*set_value)(struct obj_def *od, u16_t len, void *value);

  u8_t node_type;

  u16_t maxlength;

  /* aditional struct members */

  s32_t *objid;

  struct mib_node **nptr;

};

struct mib_list_node

{

  struct mib_list_node *prev;

  struct mib_list_node *next;

  s32_t objid;

  struct mib_node *nptr;

};

/** derived node, points to a doubly linked list

    of sub-identifiers plus a 'child' pointer */

struct mib_list_rootnode

{

  /* inherited "base class" members */

  void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);

  void (*get_value)(struct obj_def *od, u16_t len, void *value);

  u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);

  void (*set_value)(struct obj_def *od, u16_t len, void *value);

  u8_t node_type;

  u16_t maxlength;

  /* aditional struct members */

  struct mib_list_node *head;

  struct mib_list_node *tail;

  /* counts list nodes in list  */

  u16_t count;

};

/** derived node, has access functions for mib object in external memory or device

    using 'tree_level' and 'idx', with a range 0 .. (level_length() - 1) */

struct mib_external_node

{

  /* inherited "base class" members */

  void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);

  void (*get_value)(struct obj_def *od, u16_t len, void *value);

  u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);

  void (*set_value)(struct obj_def *od, u16_t len, void *value);

  u8_t node_type;

  u16_t maxlength;

  /* aditional struct members */

  /** points to an extenal (in memory) record of some sort of addressing

      information, passed to and interpreted by the funtions below */

  void* addr_inf;

  /** tree levels under this node */

  u8_t tree_levels;

  /** number of objects at this level */

  u16_t (*level_length)(void* addr_inf, u8_t level);

  /** compares object sub identifier with external id

      return zero when equal, nonzero when unequal */

  s32_t (*ident_cmp)(void* addr_inf, u8_t level, u16_t idx, s32_t sub_id);

  void (*get_objid)(void* addr_inf, u8_t level, u16_t idx, s32_t *sub_id);

  /** async Questions */

  void (*get_object_def_q)(void* addr_inf, u8_t rid, u8_t ident_len, s32_t *ident);

  void (*get_value_q)(u8_t rid, struct obj_def *od);

  void (*set_test_q)(u8_t rid, struct obj_def *od);

  void (*set_value_q)(u8_t rid, struct obj_def *od, u16_t len, void *value);

  /** async Answers */

  void (*get_object_def_a)(u8_t rid, u8_t ident_len, s32_t *ident, struct obj_def *od);

  void (*get_value_a)(u8_t rid, struct obj_def *od, u16_t len, void *value);

  u8_t (*set_test_a)(u8_t rid, struct obj_def *od, u16_t len, void *value);

  void (*set_value_a)(u8_t rid, struct obj_def *od, u16_t len, void *value);

  /** async Panic Close (agent returns error reply,

      e.g. used for external transaction cleanup) */

  void (*get_object_def_pc)(u8_t rid, u8_t ident_len, s32_t *ident);

  void (*get_value_pc)(u8_t rid, struct obj_def *od);

  void (*set_test_pc)(u8_t rid, struct obj_def *od);

  void (*set_value_pc)(u8_t rid, struct obj_def *od);

};

/** export MIB tree from mib2.c */

extern const struct mib_array_node internet;

/** dummy function pointers for non-leaf MIB nodes from mib2.c */

void noleafs_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);

void noleafs_get_value(struct obj_def *od, u16_t len, void *value);

u8_t noleafs_set_test(struct obj_def *od, u16_t len, void *value);

void noleafs_set_value(struct obj_def *od, u16_t len, void *value);

void snmp_oidtoip(s32_t *ident, struct ip_addr *ip);

void snmp_iptooid(struct ip_addr *ip, s32_t *ident);

void snmp_ifindextonetif(s32_t ifindex, struct netif **netif);

void snmp_netiftoifindex(struct netif *netif, s32_t *ifidx);

struct mib_list_node* snmp_mib_ln_alloc(s32_t id);

void snmp_mib_ln_free(struct mib_list_node *ln);

struct mib_list_rootnode* snmp_mib_lrn_alloc(void);

void snmp_mib_lrn_free(struct mib_list_rootnode *lrn);

s8_t snmp_mib_node_insert(struct mib_list_rootnode *rn, s32_t objid, struct mib_list_node **insn);

s8_t snmp_mib_node_find(struct mib_list_rootnode *rn, s32_t objid, struct mib_list_node **fn);

struct mib_list_rootnode *snmp_mib_node_delete(struct mib_list_rootnode *rn, struct mib_list_node *n);

struct mib_node* snmp_search_tree(struct mib_node *node, u8_t ident_len, s32_t *ident, struct snmp_name_ptr *np);

struct mib_node* snmp_expand_tree(struct mib_node *node, u8_t ident_len, s32_t *ident, struct snmp_obj_id *oidret);

u8_t snmp_iso_prefix_tst(u8_t ident_len, s32_t *ident);

u8_t snmp_iso_prefix_expand(u8_t ident_len, s32_t *ident, struct snmp_obj_id *oidret);

#endif /* LWIP_SNMP */

#endif