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lpc1768/lwip/include/lwip/snmp_msg.h@0:8cc2035bebfc, 2010-08-06 (annotated)

Committer:
pmr1
Date:
Fri Aug 06 17:57:45 2010 +0000
Revision:
0:8cc2035bebfc

        

        
Who changed what in which revision?

        

            
                
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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__ */