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106 lines
4.8 KiB
C
106 lines
4.8 KiB
C
/**
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* @file
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* Abstract Syntax Notation One (ISO 8824, 8825) codec.
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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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* Martin Hentschel <info@cl-soft.de>
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*/
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#ifndef LWIP_HDR_APPS_SNMP_ASN1_H
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#define LWIP_HDR_APPS_SNMP_ASN1_H
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#include "lwip/apps/snmp_opts.h"
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#if LWIP_SNMP
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#include "lwip/err.h"
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#include "lwip/apps/snmp_core.h"
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#include "snmp_pbuf_stream.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SNMP_ASN1_TLV_INDEFINITE_LENGTH 0x80
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#define SNMP_ASN1_CLASS_MASK 0xC0
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#define SNMP_ASN1_CONTENTTYPE_MASK 0x20
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#define SNMP_ASN1_DATATYPE_MASK 0x1F
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#define SNMP_ASN1_DATATYPE_EXTENDED 0x1F /* DataType indicating that datatype is encoded in following bytes */
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/* context specific (SNMP) tags (from SNMP spec. RFC1157) */
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#define SNMP_ASN1_CONTEXT_PDU_GET_REQ 0
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#define SNMP_ASN1_CONTEXT_PDU_GET_NEXT_REQ 1
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#define SNMP_ASN1_CONTEXT_PDU_GET_RESP 2
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#define SNMP_ASN1_CONTEXT_PDU_SET_REQ 3
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#define SNMP_ASN1_CONTEXT_PDU_TRAP 4
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#define SNMP_ASN1_CONTEXT_PDU_GET_BULK_REQ 5
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#define SNMP_ASN1_CONTEXT_VARBIND_NO_SUCH_OBJECT 0
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#define SNMP_ASN1_CONTEXT_VARBIND_END_OF_MIB_VIEW 2
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struct snmp_asn1_tlv
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{
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u8_t type; /* only U8 because extended types are not specified by SNMP */
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u8_t type_len; /* encoded length of 'type' field (normally 1) */
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u8_t length_len; /* indicates how many bytes are required to encode the 'value_len' field */
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u16_t value_len; /* encoded length of the value */
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};
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#define SNMP_ASN1_TLV_LENGTH(tlv) ((tlv).type_len + (tlv).length_len + (tlv).value_len)
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#define SNMP_ASN1_SET_TLV_PARAMS(tlv, type_, length_len_, value_len_) do { (tlv).type = (type_); (tlv).type_len = 0; (tlv).length_len = (length_len_); (tlv).value_len = (value_len_); } while (0);
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err_t snmp_asn1_dec_tlv(struct snmp_pbuf_stream* pbuf_stream, struct snmp_asn1_tlv* tlv);
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err_t snmp_asn1_dec_u32t(struct snmp_pbuf_stream *pbuf_stream, u16_t len, u32_t *value);
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err_t snmp_asn1_dec_u64t(struct snmp_pbuf_stream *pbuf_stream, u16_t len, u32_t *value);
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err_t snmp_asn1_dec_s32t(struct snmp_pbuf_stream *pbuf_stream, u16_t len, s32_t *value);
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err_t snmp_asn1_dec_oid(struct snmp_pbuf_stream *pbuf_stream, u16_t len, u32_t* oid, u8_t* oid_len, u8_t oid_max_len);
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err_t snmp_asn1_dec_raw(struct snmp_pbuf_stream *pbuf_stream, u16_t len, u8_t *buf, u16_t* buf_len, u16_t buf_max_len);
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err_t snmp_ans1_enc_tlv(struct snmp_pbuf_stream* pbuf_stream, struct snmp_asn1_tlv* tlv);
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void snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed);
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void snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed);
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void snmp_asn1_enc_u64t_cnt(const u32_t *value, u16_t *octets_needed);
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void snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed);
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void snmp_asn1_enc_oid_cnt(const u32_t *oid, u16_t oid_len, u16_t *octets_needed);
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err_t snmp_asn1_enc_oid(struct snmp_pbuf_stream* pbuf_stream, const u32_t *oid, u16_t oid_len);
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err_t snmp_asn1_enc_s32t(struct snmp_pbuf_stream* pbuf_stream, u16_t octets_needed, s32_t value);
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err_t snmp_asn1_enc_u32t(struct snmp_pbuf_stream* pbuf_stream, u16_t octets_needed, u32_t value);
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err_t snmp_asn1_enc_u64t(struct snmp_pbuf_stream* pbuf_stream, u16_t octets_needed, const u32_t* value);
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err_t snmp_asn1_enc_raw(struct snmp_pbuf_stream* pbuf_stream, const u8_t *raw, u16_t raw_len);
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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_HDR_APPS_SNMP_ASN1_H */
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