snmp-message.h

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/*
 * Copyright (C) 2019 Yago Fontoura do Rosario <yago.rosario@hotmail.com.br>
 * 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. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``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
 * COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */
/*---------------------------------------------------------------------------*/

/**
 * \file
 *      An implementation of the Simple Network Management Protocol (RFC 3411-3418)
 * \author
 *      Yago Fontoura do Rosario <yago.rosario@hotmail.com.br
 */

/**
 * \addtogroup snmp
 * @{
 */

#ifndef SNMP_MESSAGE_H_
#define SNMP_MESSAGE_H_

#include "snmp.h"

#define SNMP_DATA_TYPE_TIME_TICKS               0x43
#define SNMP_DATA_TYPE_NO_SUCH_INSTANCE         0x81
#define SNMP_DATA_TYPE_END_OF_MIB_VIEW          0x82

#define SNMP_DATA_TYPE_PDU_GET_REQUEST          0xA0
#define SNMP_DATA_TYPE_PDU_GET_NEXT_REQUEST     0xA1
#define SNMP_DATA_TYPE_PDU_GET_RESPONSE         0xA2
#define SNMP_DATA_TYPE_PDU_SET_REQUEST          0xA3
#define SNMP_DATA_TYPE_PDU_TRAP                 0xA4
#define SNMP_DATA_TYPE_PDU_GET_BULK             0xA5

/**
 * @brief Encodes a SNMP message
 *
 * @param out A pointer to the end of the buffer
 * @param out_len A pointer to the buffer length
 * @param header The SNMP header struct
 * @param varbinds The varbinds array
 * @param varbinds_length The number of varbinds
 *
 * @return
 */
unsigned char *
snmp_message_encode(unsigned char *out, uint32_t *out_len, snmp_header_t *header,
                    snmp_varbind_t *varbinds, uint32_t varbinds_length);
/**
 * @brief
 *
 * @param buf A pointer to the beginning of the buffer
 * @param buf_len A pointer to the buffer length
 * @param header The SNMP header struct
 * @param varbinds The varbinds array
 * @param varbinds_length A pointer to the number of varbinds
 *
 * @return
 */
uint8_t *
snmp_message_decode(uint8_t *buf, uint32_t buf_len, snmp_header_t *header,
                    snmp_varbind_t *varbinds, uint32_t *varbinds_length);

#endif /* SNMP_MESSAGE_H_ */

/** @} */