316 lines
9.3 KiB
C
316 lines
9.3 KiB
C
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/**
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* @file
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* SNMP Agent message handling structures.
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*/
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/*
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* Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Christiaan Simons <christiaan.simons@axon.tv>
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*/
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#ifndef __LWIP_SNMP_MSG_H__
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#define __LWIP_SNMP_MSG_H__
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#include "lwip/opt.h"
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#include "lwip/snmp.h"
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#include "lwip/snmp_structs.h"
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#include "lwip/ip_addr.h"
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#include "lwip/err.h"
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#if LWIP_SNMP
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#if SNMP_PRIVATE_MIB
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/* When using a private MIB, you have to create a file 'private_mib.h' that contains
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* a 'struct mib_array_node mib_private' which contains your MIB. */
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#include "private_mib.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* The listen port of the SNMP agent. Clients have to make their requests to
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this port. Most standard clients won't work if you change this! */
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#ifndef SNMP_IN_PORT
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#define SNMP_IN_PORT 161
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#endif
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/* The remote port the SNMP agent sends traps to. Most standard trap sinks won't
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work if you change this! */
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#ifndef SNMP_TRAP_PORT
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#define SNMP_TRAP_PORT 162
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#endif
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#define SNMP_ES_NOERROR 0
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#define SNMP_ES_TOOBIG 1
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#define SNMP_ES_NOSUCHNAME 2
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#define SNMP_ES_BADVALUE 3
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#define SNMP_ES_READONLY 4
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#define SNMP_ES_GENERROR 5
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#define SNMP_GENTRAP_COLDSTART 0
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#define SNMP_GENTRAP_WARMSTART 1
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#define SNMP_GENTRAP_AUTHFAIL 4
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#define SNMP_GENTRAP_ENTERPRISESPC 6
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struct snmp_varbind
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{
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/* next pointer, NULL for last in list */
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struct snmp_varbind *next;
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/* previous pointer, NULL for first in list */
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struct snmp_varbind *prev;
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/* object identifier length (in s32_t) */
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u8_t ident_len;
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/* object identifier array */
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s32_t *ident;
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/* object value ASN1 type */
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u8_t value_type;
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/* object value length (in u8_t) */
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u8_t value_len;
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/* object value */
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void *value;
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/* encoding varbind seq length length */
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u8_t seqlenlen;
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/* encoding object identifier length length */
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u8_t olenlen;
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/* encoding object value length length */
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u8_t vlenlen;
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/* encoding varbind seq length */
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u16_t seqlen;
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/* encoding object identifier length */
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u16_t olen;
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/* encoding object value length */
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u16_t vlen;
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};
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struct snmp_varbind_root
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{
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struct snmp_varbind *head;
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struct snmp_varbind *tail;
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/* number of variable bindings in list */
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u8_t count;
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/* encoding varbind-list seq length length */
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u8_t seqlenlen;
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/* encoding varbind-list seq length */
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u16_t seqlen;
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};
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/** output response message header length fields */
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struct snmp_resp_header_lengths
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{
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/* encoding error-index length length */
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u8_t erridxlenlen;
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/* encoding error-status length length */
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u8_t errstatlenlen;
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/* encoding request id length length */
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u8_t ridlenlen;
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/* encoding pdu length length */
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u8_t pdulenlen;
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/* encoding community length length */
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u8_t comlenlen;
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/* encoding version length length */
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u8_t verlenlen;
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/* encoding sequence length length */
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u8_t seqlenlen;
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/* encoding error-index length */
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u16_t erridxlen;
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/* encoding error-status length */
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u16_t errstatlen;
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/* encoding request id length */
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u16_t ridlen;
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/* encoding pdu length */
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u16_t pdulen;
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/* encoding community length */
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u16_t comlen;
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/* encoding version length */
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u16_t verlen;
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/* encoding sequence length */
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u16_t seqlen;
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};
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/** output response message header length fields */
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struct snmp_trap_header_lengths
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{
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/* encoding timestamp length length */
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u8_t tslenlen;
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/* encoding specific-trap length length */
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u8_t strplenlen;
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/* encoding generic-trap length length */
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u8_t gtrplenlen;
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/* encoding agent-addr length length */
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u8_t aaddrlenlen;
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/* encoding enterprise-id length length */
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u8_t eidlenlen;
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/* encoding pdu length length */
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u8_t pdulenlen;
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/* encoding community length length */
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u8_t comlenlen;
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/* encoding version length length */
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u8_t verlenlen;
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/* encoding sequence length length */
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u8_t seqlenlen;
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/* encoding timestamp length */
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u16_t tslen;
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/* encoding specific-trap length */
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u16_t strplen;
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/* encoding generic-trap length */
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u16_t gtrplen;
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/* encoding agent-addr length */
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u16_t aaddrlen;
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/* encoding enterprise-id length */
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u16_t eidlen;
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/* encoding pdu length */
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u16_t pdulen;
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/* encoding community length */
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u16_t comlen;
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/* encoding version length */
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u16_t verlen;
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/* encoding sequence length */
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u16_t seqlen;
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};
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/* Accepting new SNMP messages. */
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#define SNMP_MSG_EMPTY 0
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/* Search for matching object for variable binding. */
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#define SNMP_MSG_SEARCH_OBJ 1
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/* Perform SNMP operation on in-memory object.
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Pass-through states, for symmetry only. */
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#define SNMP_MSG_INTERNAL_GET_OBJDEF 2
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#define SNMP_MSG_INTERNAL_GET_VALUE 3
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#define SNMP_MSG_INTERNAL_SET_TEST 4
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#define SNMP_MSG_INTERNAL_GET_OBJDEF_S 5
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#define SNMP_MSG_INTERNAL_SET_VALUE 6
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/* Perform SNMP operation on object located externally.
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In theory this could be used for building a proxy agent.
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Practical use is for an enterprise spc. app. gateway. */
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#define SNMP_MSG_EXTERNAL_GET_OBJDEF 7
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#define SNMP_MSG_EXTERNAL_GET_VALUE 8
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#define SNMP_MSG_EXTERNAL_SET_TEST 9
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#define SNMP_MSG_EXTERNAL_GET_OBJDEF_S 10
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#define SNMP_MSG_EXTERNAL_SET_VALUE 11
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#define SNMP_COMMUNITY_STR_LEN 64
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struct snmp_msg_pstat
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{
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/* lwIP local port (161) binding */
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struct udp_pcb *pcb;
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/* source IP address */
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ip_addr_t sip;
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/* source UDP port */
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u16_t sp;
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/* request type */
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u8_t rt;
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/* request ID */
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s32_t rid;
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/* error status */
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s32_t error_status;
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/* error index */
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s32_t error_index;
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/* community name (zero terminated) */
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u8_t community[SNMP_COMMUNITY_STR_LEN + 1];
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/* community string length (exclusive zero term) */
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u8_t com_strlen;
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/* one out of MSG_EMPTY, MSG_DEMUX, MSG_INTERNAL, MSG_EXTERNAL_x */
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u8_t state;
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/* saved arguments for MSG_EXTERNAL_x */
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struct mib_external_node *ext_mib_node;
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struct snmp_name_ptr ext_name_ptr;
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struct obj_def ext_object_def;
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struct snmp_obj_id ext_oid;
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/* index into input variable binding list */
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u8_t vb_idx;
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/* ptr into input variable binding list */
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struct snmp_varbind *vb_ptr;
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/* list of variable bindings from input */
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struct snmp_varbind_root invb;
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/* list of variable bindings to output */
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struct snmp_varbind_root outvb;
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/* output response lengths used in ASN encoding */
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struct snmp_resp_header_lengths rhl;
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};
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struct snmp_msg_trap
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{
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/* lwIP local port (161) binding */
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struct udp_pcb *pcb;
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/* destination IP address in network order */
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ip_addr_t dip;
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/* source enterprise ID (sysObjectID) */
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struct snmp_obj_id *enterprise;
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/* source IP address, raw network order format */
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u8_t sip_raw[4];
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/* generic trap code */
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u32_t gen_trap;
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/* specific trap code */
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u32_t spc_trap;
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/* timestamp */
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u32_t ts;
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/* list of variable bindings to output */
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struct snmp_varbind_root outvb;
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/* output trap lengths used in ASN encoding */
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struct snmp_trap_header_lengths thl;
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};
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/** Agent Version constant, 0 = v1 oddity */
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extern const s32_t snmp_version;
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/** Agent default "public" community string */
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extern const char snmp_publiccommunity[7];
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extern struct snmp_msg_trap trap_msg;
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/** Agent setup, start listening to port 161. */
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void snmp_init(void);
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void snmp_trap_dst_enable(u8_t dst_idx, u8_t enable);
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void snmp_trap_dst_ip_set(u8_t dst_idx, ip_addr_t *dst);
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/** Varbind-list functions. */
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struct snmp_varbind* snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len);
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void snmp_varbind_free(struct snmp_varbind *vb);
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void snmp_varbind_list_free(struct snmp_varbind_root *root);
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void snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb);
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struct snmp_varbind* snmp_varbind_tail_remove(struct snmp_varbind_root *root);
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/** Handle an internal (recv) or external (private response) event. */
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void snmp_msg_event(u8_t request_id);
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err_t snmp_send_response(struct snmp_msg_pstat *m_stat);
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err_t snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap);
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void snmp_coldstart_trap(void);
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void snmp_authfail_trap(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_SNMP */
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#endif /* __LWIP_SNMP_MSG_H__ */
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