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/**

 * @file

 * SNMP Agent message handling structures.

 */

/*

 * 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_MSG_H__

#define __LWIP_SNMP_MSG_H__

#include "lwip/opt.h"

#include "lwip/snmp.h"

#include "lwip/snmp_structs.h"

#if LWIP_SNMP

#if SNMP_PRIVATE_MIB

#include "private_mib.h"

#endif

#ifdef __cplusplus

extern "C" {

#endif

/* The listen port of the SNMP agent. Clients have to make their requests to

   this port. Most standard clients won't work if you change this! */

#ifndef SNMP_IN_PORT

#define SNMP_IN_PORT 161

#endif

/* The remote port the SNMP agent sends traps to. Most standard trap sinks won't

   work if you change this! */

#ifndef SNMP_TRAP_PORT

#define SNMP_TRAP_PORT 162

#endif

#define SNMP_ES_NOERROR 0

#define SNMP_ES_TOOBIG 1

#define SNMP_ES_NOSUCHNAME 2

#define SNMP_ES_BADVALUE 3

#define SNMP_ES_READONLY 4

#define SNMP_ES_GENERROR 5

#define SNMP_GENTRAP_COLDSTART 0

#define SNMP_GENTRAP_WARMSTART 1

#define SNMP_GENTRAP_AUTHFAIL 4

#define SNMP_GENTRAP_ENTERPRISESPC 6

struct snmp_varbind

{

  /* next pointer, NULL for last in list */

  struct snmp_varbind *next;

  /* previous pointer, NULL for first in list */

  struct snmp_varbind *prev;

  /* object identifier length (in s32_t) */

  u8_t ident_len;

  /* object identifier array */

  s32_t *ident;

  /* object value ASN1 type */

  u8_t value_type;

  /* object value length (in u8_t) */

  u8_t value_len;

  /* object value */

  void *value;

  /* encoding varbind seq length length */

  u8_t seqlenlen;

  /* encoding object identifier length length */

  u8_t olenlen;

  /* encoding object value length length */

  u8_t vlenlen;

  /* encoding varbind seq length */

  u16_t seqlen;

  /* encoding object identifier length */

  u16_t olen;

  /* encoding object value length */

  u16_t vlen;

};

struct snmp_varbind_root

{

  struct snmp_varbind *head;

  struct snmp_varbind *tail;

  /* number of variable bindings in list */

  u8_t count;

  /* encoding varbind-list seq length length */

  u8_t seqlenlen;

  /* encoding varbind-list seq length */

  u16_t seqlen;

};

/** output response message header length fields */

struct snmp_resp_header_lengths

{

  /* encoding error-index length length */

  u8_t erridxlenlen;

  /* encoding error-status length length */

  u8_t errstatlenlen;

  /* encoding request id length length */

  u8_t ridlenlen;

  /* encoding pdu length length */

  u8_t pdulenlen;

  /* encoding community length length */

  u8_t comlenlen;

  /* encoding version length length */

  u8_t verlenlen;

  /* encoding sequence length length */

  u8_t seqlenlen;

  /* encoding error-index length */

  u16_t erridxlen;

  /* encoding error-status length */

  u16_t errstatlen;

  /* encoding request id length */

  u16_t ridlen;

  /* encoding pdu length */

  u16_t pdulen;

  /* encoding community length */

  u16_t comlen;

  /* encoding version length */

  u16_t verlen;

  /* encoding sequence length */

  u16_t seqlen;

};

/** output response message header length fields */

struct snmp_trap_header_lengths

{

  /* encoding timestamp length length */

  u8_t tslenlen;

  /* encoding specific-trap length length */

  u8_t strplenlen;

  /* encoding generic-trap length length */

  u8_t gtrplenlen;

  /* encoding agent-addr length length */

  u8_t aaddrlenlen;

  /* encoding enterprise-id length length */

  u8_t eidlenlen;

  /* encoding pdu length length */

  u8_t pdulenlen;

  /* encoding community length length */

  u8_t comlenlen;

  /* encoding version length length */

  u8_t verlenlen;

  /* encoding sequence length length */

  u8_t seqlenlen;

  /* encoding timestamp length */

  u16_t tslen;

  /* encoding specific-trap length */

  u16_t strplen;

  /* encoding generic-trap length */

  u16_t gtrplen;

  /* encoding agent-addr length */

  u16_t aaddrlen;

  /* encoding enterprise-id length */

  u16_t eidlen;

  /* encoding pdu length */

  u16_t pdulen;

  /* encoding community length */

  u16_t comlen;

  /* encoding version length */

  u16_t verlen;

  /* encoding sequence length */

  u16_t seqlen;

};

/* Accepting new SNMP messages. */

#define SNMP_MSG_EMPTY                 0

/* Search for matching object for variable binding. */

#define SNMP_MSG_SEARCH_OBJ            1

/* Perform SNMP operation on in-memory object.

   Pass-through states, for symmetry only. */

#define SNMP_MSG_INTERNAL_GET_OBJDEF   2

#define SNMP_MSG_INTERNAL_GET_VALUE    3

#define SNMP_MSG_INTERNAL_SET_TEST     4

#define SNMP_MSG_INTERNAL_GET_OBJDEF_S 5

#define SNMP_MSG_INTERNAL_SET_VALUE    6

/* Perform SNMP operation on object located externally.

   In theory this could be used for building a proxy agent.

   Practical use is for an enterprise spc. app. gateway. */

#define SNMP_MSG_EXTERNAL_GET_OBJDEF   7

#define SNMP_MSG_EXTERNAL_GET_VALUE    8

#define SNMP_MSG_EXTERNAL_SET_TEST     9

#define SNMP_MSG_EXTERNAL_GET_OBJDEF_S 10

#define SNMP_MSG_EXTERNAL_SET_VALUE    11

#define SNMP_COMMUNITY_STR_LEN 64

struct snmp_msg_pstat

{

  /* lwIP local port (161) binding */

  struct udp_pcb *pcb;

  /* source IP address */

  struct ip_addr sip;

  /* source UDP port */

  u16_t sp;

  /* request type */

  u8_t rt;

  /* request ID */

  s32_t rid;

  /* error status */

  s32_t error_status;

  /* error index */

  s32_t error_index;

  /* community name (zero terminated) */

  u8_t community[SNMP_COMMUNITY_STR_LEN + 1];

  /* community string length (exclusive zero term) */

  u8_t com_strlen;

  /* one out of MSG_EMPTY, MSG_DEMUX, MSG_INTERNAL, MSG_EXTERNAL_x */

  u8_t state;

  /* saved arguments for MSG_EXTERNAL_x */

  struct mib_external_node *ext_mib_node;

  struct snmp_name_ptr ext_name_ptr;

  struct obj_def ext_object_def;

  struct snmp_obj_id ext_oid;

  /* index into input variable binding list */

  u8_t vb_idx;

  /* ptr into input variable binding list */

  struct snmp_varbind *vb_ptr;

  /* list of variable bindings from input */

  struct snmp_varbind_root invb;

  /* list of variable bindings to output */

  struct snmp_varbind_root outvb;

  /* output response lengths used in ASN encoding */

  struct snmp_resp_header_lengths rhl;

};

struct snmp_msg_trap

{

  /* lwIP local port (161) binding */

  struct udp_pcb *pcb;

  /* destination IP address in network order */

  struct ip_addr dip;

  /* source enterprise ID (sysObjectID) */

  struct snmp_obj_id *enterprise;

  /* source IP address, raw network order format */

  u8_t sip_raw[4];

  /* generic trap code */

  u32_t gen_trap;

  /* specific trap code */

  u32_t spc_trap;

  /* timestamp */

  u32_t ts;

  /* list of variable bindings to output */

  struct snmp_varbind_root outvb;

  /* output trap lengths used in ASN encoding */

  struct snmp_trap_header_lengths thl;

};

/** Agent Version constant, 0 = v1 oddity */

extern const s32_t snmp_version;

/** Agent default "public" community string */

extern const char snmp_publiccommunity[7];

extern struct snmp_msg_trap trap_msg;

/** Agent setup, start listening to port 161. */

void snmp_init(void);

void snmp_trap_dst_enable(u8_t dst_idx, u8_t enable);

void snmp_trap_dst_ip_set(u8_t dst_idx, struct ip_addr *dst);

/** Varbind-list functions. */

struct snmp_varbind* snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len);

void snmp_varbind_free(struct snmp_varbind *vb);

void snmp_varbind_list_free(struct snmp_varbind_root *root);

void snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb);

struct snmp_varbind* snmp_varbind_tail_remove(struct snmp_varbind_root *root);

/** Handle an internal (recv) or external (private response) event. */

void snmp_msg_event(u8_t request_id);

err_t snmp_send_response(struct snmp_msg_pstat *m_stat);

err_t snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap);

void snmp_coldstart_trap(void);

void snmp_authfail_trap(void);

#ifdef __cplusplus

}

#endif

#endif /* LWIP_SNMP */

#endif /* __LWIP_SNMP_MSG_H__ */