/**
 * @file
 * Management Information Base II (RFC1213) objects and functions.
 *
 * @note the object identifiers for this MIB-2 and private MIB tree
 * must be kept in sorted ascending order. This to ensure correct getnext operation.
 */

/*
 * 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>
 */

#include "lwip/opt.h"

#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */

#include "lwip/snmp.h"
#include "lwip/netif.h"
#include "lwip/ip.h"
#include "lwip/ip_frag.h"
#include "lwip/tcp.h"
#include "lwip/udp.h"
#include "lwip/snmp_asn1.h"
#include "lwip/snmp_structs.h"
#include "netif/etharp.h"

/**
 * IANA assigned enterprise ID for lwIP is 26381
 * @see http://www.iana.org/assignments/enterprise-numbers
 *
 * @note this enterprise ID is assigned to the lwIP project,
 * all object identifiers living under this ID are assigned
 * by the lwIP maintainers (contact Christiaan Simons)!
 * @note don't change this define, use snmp_set_sysobjid()
 *
 * If you need to create your own private MIB you'll need
 * to apply for your own enterprise ID with IANA:
 * http://www.iana.org/numbers.html
 */
#define SNMP_ENTERPRISE_ID 26381
#define SNMP_SYSOBJID_LEN 7
#define SNMP_SYSOBJID {1, 3, 6, 1, 4, 1, SNMP_ENTERPRISE_ID}

#ifndef SNMP_SYSSERVICES
#define SNMP_SYSSERVICES ((1 << 6) | (1 << 3) | ((IP_FORWARD) << 2))
#endif

#ifndef SNMP_GET_SYSUPTIME
#define SNMP_GET_SYSUPTIME(sysuptime)
#endif

static void system_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void system_get_value(struct obj_def *od, u16_t len, void *value);
static u8_t system_set_test(struct obj_def *od, u16_t len, void *value);
static void system_set_value(struct obj_def *od, u16_t len, void *value);
static void interfaces_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void interfaces_get_value(struct obj_def *od, u16_t len, void *value);
static void ifentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ifentry_get_value(struct obj_def *od, u16_t len, void *value);
#if !SNMP_SAFE_REQUESTS
static u8_t ifentry_set_test (struct obj_def *od, u16_t len, void *value);
static void ifentry_set_value (struct obj_def *od, u16_t len, void *value);
#endif /* SNMP_SAFE_REQUESTS */
static void atentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void atentry_get_value(struct obj_def *od, u16_t len, void *value);
static void ip_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_get_value(struct obj_def *od, u16_t len, void *value);
static u8_t ip_set_test(struct obj_def *od, u16_t len, void *value);
static void ip_addrentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_addrentry_get_value(struct obj_def *od, u16_t len, void *value);
static void ip_rteentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_rteentry_get_value(struct obj_def *od, u16_t len, void *value);
static void ip_ntomentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_ntomentry_get_value(struct obj_def *od, u16_t len, void *value);
static void icmp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void icmp_get_value(struct obj_def *od, u16_t len, void *value);
#if LWIP_TCP
static void tcp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void tcp_get_value(struct obj_def *od, u16_t len, void *value);
#ifdef THIS_SEEMS_UNUSED
static void tcpconnentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void tcpconnentry_get_value(struct obj_def *od, u16_t len, void *value);
#endif
#endif
static void udp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void udp_get_value(struct obj_def *od, u16_t len, void *value);
static void udpentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void udpentry_get_value(struct obj_def *od, u16_t len, void *value);
static void snmp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void snmp_get_value(struct obj_def *od, u16_t len, void *value);
static u8_t snmp_set_test(struct obj_def *od, u16_t len, void *value);
static void snmp_set_value(struct obj_def *od, u16_t len, void *value);


/* snmp .1.3.6.1.2.1.11 */
const mib_scalar_node snmp_scalar = {
  &snmp_get_object_def,
  &snmp_get_value,
  &snmp_set_test,
  &snmp_set_value,
  MIB_NODE_SC,
  0
};
const s32_t snmp_ids[28] = {
  1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16,
  17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30
};
struct mib_node* const snmp_nodes[28] = {
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar,
  (struct mib_node* const)&snmp_scalar, (struct mib_node* const)&snmp_scalar
};
const struct mib_array_node snmp = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  28,
  snmp_ids,
  snmp_nodes
};

/* dot3 and EtherLike MIB not planned. (transmission .1.3.6.1.2.1.10) */
/* historical (some say hysterical). (cmot .1.3.6.1.2.1.9) */
/* lwIP has no EGP, thus may not implement it. (egp .1.3.6.1.2.1.8) */

/* udp .1.3.6.1.2.1.7 */
/** index root node for udpTable */
struct mib_list_rootnode udp_root = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_LR,
  0,
  NULL,
  NULL,
  0
};
const s32_t udpentry_ids[2] = { 1, 2 };
struct mib_node* const udpentry_nodes[2] = {
  (struct mib_node* const)&udp_root, (struct mib_node* const)&udp_root,
};
const struct mib_array_node udpentry = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  2,
  udpentry_ids,
  udpentry_nodes
};

s32_t udptable_id = 1;
struct mib_node* udptable_node = (struct mib_node* const)&udpentry;
struct mib_ram_array_node udptable = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_RA,
  0,
  &udptable_id,
  &udptable_node
};

const mib_scalar_node udp_scalar = {
  &udp_get_object_def,
  &udp_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_SC,
  0
};
const s32_t udp_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const udp_nodes[5] = {
  (struct mib_node* const)&udp_scalar, (struct mib_node* const)&udp_scalar,
  (struct mib_node* const)&udp_scalar, (struct mib_node* const)&udp_scalar,
  (struct mib_node* const)&udptable
};
const struct mib_array_node udp = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  5,
  udp_ids,
  udp_nodes
};

/* tcp .1.3.6.1.2.1.6 */
#if LWIP_TCP
/* only if the TCP protocol is available may implement this group */
/** index root node for tcpConnTable */
struct mib_list_rootnode tcpconntree_root = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_LR,
  0,
  NULL,
  NULL,
  0
};
const s32_t tcpconnentry_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const tcpconnentry_nodes[5] = {
  (struct mib_node* const)&tcpconntree_root, (struct mib_node* const)&tcpconntree_root,
  (struct mib_node* const)&tcpconntree_root, (struct mib_node* const)&tcpconntree_root,
  (struct mib_node* const)&tcpconntree_root
};
const struct mib_array_node tcpconnentry = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  5,
  tcpconnentry_ids,
  tcpconnentry_nodes
};

s32_t tcpconntable_id = 1;
struct mib_node* tcpconntable_node = (struct mib_node* const)&tcpconnentry;
struct mib_ram_array_node tcpconntable = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_RA,
/** @todo update maxlength when inserting / deleting from table
   0 when table is empty, 1 when more than one entry */
  0,
  &tcpconntable_id,
  &tcpconntable_node
};

const mib_scalar_node tcp_scalar = {
  &tcp_get_object_def,
  &tcp_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_SC,
  0
};
const s32_t tcp_ids[15] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
struct mib_node* const tcp_nodes[15] = {
  (struct mib_node* const)&tcp_scalar, (struct mib_node* const)&tcp_scalar,
  (struct mib_node* const)&tcp_scalar, (struct mib_node* const)&tcp_scalar,
  (struct mib_node* const)&tcp_scalar, (struct mib_node* const)&tcp_scalar,
  (struct mib_node* const)&tcp_scalar, (struct mib_node* const)&tcp_scalar,
  (struct mib_node* const)&tcp_scalar, (struct mib_node* const)&tcp_scalar,
  (struct mib_node* const)&tcp_scalar, (struct mib_node* const)&tcp_scalar,
  (struct mib_node* const)&tcpconntable, (struct mib_node* const)&tcp_scalar,
  (struct mib_node* const)&tcp_scalar
};
const struct mib_array_node tcp = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  15,
  tcp_ids,
  tcp_nodes
};
#endif

/* icmp .1.3.6.1.2.1.5 */
const mib_scalar_node icmp_scalar = {
  &icmp_get_object_def,
  &icmp_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_SC,
  0
};
const s32_t icmp_ids[26] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 };
struct mib_node* const icmp_nodes[26] = {
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar,
  (struct mib_node* const)&icmp_scalar, (struct mib_node* const)&icmp_scalar
};
const struct mib_array_node icmp = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  26,
  icmp_ids,
  icmp_nodes
};

/** index root node for ipNetToMediaTable */
struct mib_list_rootnode ipntomtree_root = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_LR,
  0,
  NULL,
  NULL,
  0
};
const s32_t ipntomentry_ids[4] = { 1, 2, 3, 4 };
struct mib_node* const ipntomentry_nodes[4] = {
  (struct mib_node* const)&ipntomtree_root, (struct mib_node* const)&ipntomtree_root,
  (struct mib_node* const)&ipntomtree_root, (struct mib_node* const)&ipntomtree_root
};
const struct mib_array_node ipntomentry = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  4,
  ipntomentry_ids,
  ipntomentry_nodes
};

s32_t ipntomtable_id = 1;
struct mib_node* ipntomtable_node = (struct mib_node* const)&ipntomentry;
struct mib_ram_array_node ipntomtable = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_RA,
  0,
  &ipntomtable_id,
  &ipntomtable_node
};

/** index root node for ipRouteTable */
struct mib_list_rootnode iprtetree_root = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_LR,
  0,
  NULL,
  NULL,
  0
};
const s32_t iprteentry_ids[13] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };
struct mib_node* const iprteentry_nodes[13] = {
  (struct mib_node* const)&iprtetree_root, (struct mib_node* const)&iprtetree_root,
  (struct mib_node* const)&iprtetree_root, (struct mib_node* const)&iprtetree_root,
  (struct mib_node* const)&iprtetree_root, (struct mib_node* const)&iprtetree_root,
  (struct mib_node* const)&iprtetree_root, (struct mib_node* const)&iprtetree_root,
  (struct mib_node* const)&iprtetree_root, (struct mib_node* const)&iprtetree_root,
  (struct mib_node* const)&iprtetree_root, (struct mib_node* const)&iprtetree_root,
  (struct mib_node* const)&iprtetree_root
};
const struct mib_array_node iprteentry = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  13,
  iprteentry_ids,
  iprteentry_nodes
};

s32_t iprtetable_id = 1;
struct mib_node* iprtetable_node = (struct mib_node* const)&iprteentry;
struct mib_ram_array_node iprtetable = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_RA,
  0,
  &iprtetable_id,
  &iprtetable_node
};

/** index root node for ipAddrTable */
struct mib_list_rootnode ipaddrtree_root = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_LR,
  0,
  NULL,
  NULL,
  0
};
const s32_t ipaddrentry_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const ipaddrentry_nodes[5] = {
  (struct mib_node* const)&ipaddrtree_root,
  (struct mib_node* const)&ipaddrtree_root,
  (struct mib_node* const)&ipaddrtree_root,
  (struct mib_node* const)&ipaddrtree_root,
  (struct mib_node* const)&ipaddrtree_root
};
const struct mib_array_node ipaddrentry = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_AR,
  5,
  ipaddrentry_ids,
  ipaddrentry_nodes
};

s32_t ipaddrtable_id = 1;
struct mib_node* ipaddrtable_node = (struct mib_node* const)&ipaddrentry;
struct mib_ram_array_node ipaddrtable = {
  &noleafs_get_object_def,
  &noleafs_get_value,
  &noleafs_set_test,
  &noleafs_set_value,
  MIB_NODE_RA,
  0,
  &ipaddrtable_id,
  &ipaddrtable_node
};

/* ip .1.3.6.1.2.1.4 */
const mib_scalar_node ip_scalar = {
  &ip_get_object_def,
  &ip_get_value,
  &ip_set_test,
  &noleafs_set_value,
  MIB_NODE_SC,
  0
};
const s32_t ip_ids[23] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 };
struct mib_node* const ip_nodes[23] = {
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ip_scalar,
  (struct mib_node* const)&ip_scalar, (struct mib_node* const)&ipaddrtable,
  (struct mib_node* const)&iprtetable, (struct mib_node* const)&ipntomtable,
  (struct mib_node* const)&ip_scalar
};
const struct mib_array_node mib2_ip = {
  &noleafs_get_object_def,
  &noleafs_get_value,