[457] | 1 | /**
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| 2 | * @file
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| 3 | * SNMP core API for implementing MIBs
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
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| 8 | * All rights reserved.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without modification,
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| 11 | * are permitted provided that the following conditions are met:
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| 12 | *
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| 13 | * 1. Redistributions of source code must retain the above copyright notice,
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| 14 | * this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 16 | * this list of conditions and the following disclaimer in the documentation
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| 17 | * and/or other materials provided with the distribution.
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| 18 | * 3. The name of the author may not be used to endorse or promote products
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| 19 | * derived from this software without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 30 | * OF SUCH DAMAGE.
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| 31 | *
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| 32 | * Author: Christiaan Simons <christiaan.simons@axon.tv>
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| 33 | * Martin Hentschel <info@cl-soft.de>
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| 34 | */
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| 35 |
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| 36 | #ifndef LWIP_HDR_APPS_SNMP_CORE_H
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| 37 | #define LWIP_HDR_APPS_SNMP_CORE_H
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| 38 |
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| 39 | #include "lwip/apps/snmp_opts.h"
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| 40 |
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| 41 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
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| 42 |
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| 43 | #include "lwip/ip_addr.h"
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| 44 | #include "lwip/err.h"
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| 45 |
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| 46 | #ifdef __cplusplus
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| 47 | extern "C" {
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| 48 | #endif
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| 49 |
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| 50 | /* basic ASN1 defines */
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| 51 | #define SNMP_ASN1_CLASS_UNIVERSAL 0x00
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| 52 | #define SNMP_ASN1_CLASS_APPLICATION 0x40
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| 53 | #define SNMP_ASN1_CLASS_CONTEXT 0x80
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| 54 | #define SNMP_ASN1_CLASS_PRIVATE 0xC0
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| 55 |
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| 56 | #define SNMP_ASN1_CONTENTTYPE_PRIMITIVE 0x00
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| 57 | #define SNMP_ASN1_CONTENTTYPE_CONSTRUCTED 0x20
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| 58 |
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| 59 | /* universal tags (from ASN.1 spec.) */
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| 60 | #define SNMP_ASN1_UNIVERSAL_END_OF_CONTENT 0
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| 61 | #define SNMP_ASN1_UNIVERSAL_INTEGER 2
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| 62 | #define SNMP_ASN1_UNIVERSAL_OCTET_STRING 4
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| 63 | #define SNMP_ASN1_UNIVERSAL_NULL 5
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| 64 | #define SNMP_ASN1_UNIVERSAL_OBJECT_ID 6
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| 65 | #define SNMP_ASN1_UNIVERSAL_SEQUENCE_OF 16
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| 66 |
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| 67 | /* application specific (SNMP) tags (from SNMPv2-SMI) */
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| 68 | #define SNMP_ASN1_APPLICATION_IPADDR 0 /* [APPLICATION 0] IMPLICIT OCTET STRING (SIZE (4)) */
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| 69 | #define SNMP_ASN1_APPLICATION_COUNTER 1 /* [APPLICATION 1] IMPLICIT INTEGER (0..4294967295) => u32_t */
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| 70 | #define SNMP_ASN1_APPLICATION_GAUGE 2 /* [APPLICATION 2] IMPLICIT INTEGER (0..4294967295) => u32_t */
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| 71 | #define SNMP_ASN1_APPLICATION_TIMETICKS 3 /* [APPLICATION 3] IMPLICIT INTEGER (0..4294967295) => u32_t */
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| 72 | #define SNMP_ASN1_APPLICATION_OPAQUE 4 /* [APPLICATION 4] IMPLICIT OCTET STRING */
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| 73 | #define SNMP_ASN1_APPLICATION_COUNTER64 6 /* [APPLICATION 6] IMPLICIT INTEGER (0..18446744073709551615) */
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| 74 |
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| 75 | /* context specific (SNMP) tags (from RFC 1905) */
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| 76 | #define SNMP_ASN1_CONTEXT_VARBIND_NO_SUCH_INSTANCE 1
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| 77 |
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| 78 | /* full ASN1 type defines */
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| 79 | #define SNMP_ASN1_TYPE_END_OF_CONTENT (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_END_OF_CONTENT)
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| 80 | #define SNMP_ASN1_TYPE_INTEGER (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_INTEGER)
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| 81 | #define SNMP_ASN1_TYPE_OCTET_STRING (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_OCTET_STRING)
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| 82 | #define SNMP_ASN1_TYPE_NULL (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_NULL)
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| 83 | #define SNMP_ASN1_TYPE_OBJECT_ID (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_OBJECT_ID)
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| 84 | #define SNMP_ASN1_TYPE_SEQUENCE (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_CONSTRUCTED | SNMP_ASN1_UNIVERSAL_SEQUENCE_OF)
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| 85 | #define SNMP_ASN1_TYPE_IPADDR (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_IPADDR)
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| 86 | #define SNMP_ASN1_TYPE_IPADDRESS SNMP_ASN1_TYPE_IPADDR
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| 87 | #define SNMP_ASN1_TYPE_COUNTER (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_COUNTER)
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| 88 | #define SNMP_ASN1_TYPE_COUNTER32 SNMP_ASN1_TYPE_COUNTER
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| 89 | #define SNMP_ASN1_TYPE_GAUGE (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_GAUGE)
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| 90 | #define SNMP_ASN1_TYPE_GAUGE32 SNMP_ASN1_TYPE_GAUGE
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| 91 | #define SNMP_ASN1_TYPE_UNSIGNED32 SNMP_ASN1_TYPE_GAUGE
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| 92 | #define SNMP_ASN1_TYPE_TIMETICKS (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_TIMETICKS)
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| 93 | #define SNMP_ASN1_TYPE_OPAQUE (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_OPAQUE)
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| 94 | #if LWIP_HAVE_INT64
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| 95 | #define SNMP_ASN1_TYPE_COUNTER64 (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_COUNTER64)
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| 96 | #endif
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| 97 |
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| 98 | #define SNMP_VARBIND_EXCEPTION_OFFSET 0xF0
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| 99 | #define SNMP_VARBIND_EXCEPTION_MASK 0x0F
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| 100 |
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| 101 | /** error codes predefined by SNMP prot. */
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| 102 | typedef enum {
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| 103 | SNMP_ERR_NOERROR = 0,
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| 104 | /*
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| 105 | outdated v1 error codes. do not use anmore!
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| 106 | #define SNMP_ERR_NOSUCHNAME 2 use SNMP_ERR_NOSUCHINSTANCE instead
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| 107 | #define SNMP_ERR_BADVALUE 3 use SNMP_ERR_WRONGTYPE,SNMP_ERR_WRONGLENGTH,SNMP_ERR_WRONGENCODING or SNMP_ERR_WRONGVALUE instead
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| 108 | #define SNMP_ERR_READONLY 4 use SNMP_ERR_NOTWRITABLE instead
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| 109 | */
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| 110 | SNMP_ERR_GENERROR = 5,
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| 111 | SNMP_ERR_NOACCESS = 6,
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| 112 | SNMP_ERR_WRONGTYPE = 7,
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| 113 | SNMP_ERR_WRONGLENGTH = 8,
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| 114 | SNMP_ERR_WRONGENCODING = 9,
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| 115 | SNMP_ERR_WRONGVALUE = 10,
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| 116 | SNMP_ERR_NOCREATION = 11,
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| 117 | SNMP_ERR_INCONSISTENTVALUE = 12,
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| 118 | SNMP_ERR_RESOURCEUNAVAILABLE = 13,
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| 119 | SNMP_ERR_COMMITFAILED = 14,
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| 120 | SNMP_ERR_UNDOFAILED = 15,
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| 121 | SNMP_ERR_NOTWRITABLE = 17,
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| 122 | SNMP_ERR_INCONSISTENTNAME = 18,
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| 123 |
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| 124 | SNMP_ERR_NOSUCHINSTANCE = SNMP_VARBIND_EXCEPTION_OFFSET + SNMP_ASN1_CONTEXT_VARBIND_NO_SUCH_INSTANCE
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| 125 | } snmp_err_t;
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| 126 |
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| 127 | /** internal object identifier representation */
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| 128 | struct snmp_obj_id
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| 129 | {
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| 130 | u8_t len;
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| 131 | u32_t id[SNMP_MAX_OBJ_ID_LEN];
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| 132 | };
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| 133 |
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| 134 | struct snmp_obj_id_const_ref
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| 135 | {
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| 136 | u8_t len;
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| 137 | const u32_t* id;
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| 138 | };
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| 139 |
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| 140 | extern const struct snmp_obj_id_const_ref snmp_zero_dot_zero; /* administrative identifier from SNMPv2-SMI */
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| 141 |
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| 142 | /** SNMP variant value, used as reference in struct snmp_node_instance and table implementation */
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| 143 | union snmp_variant_value
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| 144 | {
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| 145 | void* ptr;
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| 146 | const void* const_ptr;
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| 147 | u32_t u32;
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| 148 | s32_t s32;
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| 149 | #if LWIP_HAVE_INT64
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| 150 | u64_t u64;
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| 151 | #endif
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| 152 | };
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| 153 |
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| 154 |
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| 155 | /**
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| 156 | SNMP MIB node types
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| 157 | tree node is the only node the stack can process in order to walk the tree,
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| 158 | all other nodes are assumed to be leaf nodes.
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| 159 | This cannot be an enum because users may want to define their own node types.
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| 160 | */
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| 161 | #define SNMP_NODE_TREE 0x00
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| 162 | /* predefined leaf node types */
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| 163 | #define SNMP_NODE_SCALAR 0x01
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| 164 | #define SNMP_NODE_SCALAR_ARRAY 0x02
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| 165 | #define SNMP_NODE_TABLE 0x03
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| 166 | #define SNMP_NODE_THREADSYNC 0x04
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| 167 |
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| 168 | /** node "base class" layout, the mandatory fields for a node */
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| 169 | struct snmp_node
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| 170 | {
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| 171 | /** one out of SNMP_NODE_TREE or any leaf node type (like SNMP_NODE_SCALAR) */
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| 172 | u8_t node_type;
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| 173 | /** the number assigned to this node which used as part of the full OID */
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| 174 | u32_t oid;
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| 175 | };
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| 176 |
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| 177 | /** SNMP node instance access types */
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| 178 | typedef enum {
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| 179 | SNMP_NODE_INSTANCE_ACCESS_READ = 1,
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| 180 | SNMP_NODE_INSTANCE_ACCESS_WRITE = 2,
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| 181 | SNMP_NODE_INSTANCE_READ_ONLY = SNMP_NODE_INSTANCE_ACCESS_READ,
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| 182 | SNMP_NODE_INSTANCE_READ_WRITE = (SNMP_NODE_INSTANCE_ACCESS_READ | SNMP_NODE_INSTANCE_ACCESS_WRITE),
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| 183 | SNMP_NODE_INSTANCE_WRITE_ONLY = SNMP_NODE_INSTANCE_ACCESS_WRITE,
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| 184 | SNMP_NODE_INSTANCE_NOT_ACCESSIBLE = 0
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| 185 | } snmp_access_t;
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| 186 |
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| 187 | struct snmp_node_instance;
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| 188 |
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| 189 | typedef s16_t (*node_instance_get_value_method)(struct snmp_node_instance*, void*);
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| 190 | typedef snmp_err_t (*node_instance_set_test_method)(struct snmp_node_instance*, u16_t, void*);
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| 191 | typedef snmp_err_t (*node_instance_set_value_method)(struct snmp_node_instance*, u16_t, void*);
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| 192 | typedef void (*node_instance_release_method)(struct snmp_node_instance*);
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| 193 |
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| 194 | #define SNMP_GET_VALUE_RAW_DATA 0x4000 /* do not use 0x8000 because return value of node_instance_get_value_method is signed16 and 0x8000 would be the signed bit */
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| 195 |
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| 196 | /** SNMP node instance */
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| 197 | struct snmp_node_instance
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| 198 | {
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| 199 | /** prefilled with the node, get_instance() is called on; may be changed by user to any value to pass an arbitrary node between calls to get_instance() and get_value/test_value/set_value */
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| 200 | const struct snmp_node* node;
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| 201 | /** prefilled with the instance id requested; for get_instance() this is the exact oid requested; for get_next_instance() this is the relative starting point, stack expects relative oid of next node here */
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| 202 | struct snmp_obj_id instance_oid;
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| 203 |
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| 204 | /** ASN type for this object (see snmp_asn1.h for definitions) */
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| 205 | u8_t asn1_type;
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| 206 | /** one out of instance access types defined above (SNMP_NODE_INSTANCE_READ_ONLY,...) */
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| 207 | snmp_access_t access;
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| 208 |
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| 209 | /** returns object value for the given object identifier. Return values <0 to indicate an error */
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| 210 | node_instance_get_value_method get_value;
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| 211 | /** tests length and/or range BEFORE setting */
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| 212 | node_instance_set_test_method set_test;
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| 213 | /** sets object value, only called when set_test() was successful */
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| 214 | node_instance_set_value_method set_value;
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| 215 | /** called in any case when the instance is not required anymore by stack (useful for freeing memory allocated in get_instance/get_next_instance methods) */
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| 216 | node_instance_release_method release_instance;
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| 217 |
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| 218 | /** reference to pass arbitrary value between calls to get_instance() and get_value/test_value/set_value */
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| 219 | union snmp_variant_value reference;
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| 220 | /** see reference (if reference is a pointer, the length of underlying data may be stored here or anything else) */
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| 221 | u32_t reference_len;
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| 222 | };
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| 223 |
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| 224 |
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| 225 | /** SNMP tree node */
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| 226 | struct snmp_tree_node
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| 227 | {
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| 228 | /** inherited "base class" members */
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| 229 | struct snmp_node node;
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| 230 | u16_t subnode_count;
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| 231 | const struct snmp_node* const *subnodes;
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| 232 | };
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| 233 |
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| 234 | #define SNMP_CREATE_TREE_NODE(oid, subnodes) \
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| 235 | {{ SNMP_NODE_TREE, (oid) }, \
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| 236 | (u16_t)LWIP_ARRAYSIZE(subnodes), (subnodes) }
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| 237 |
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| 238 | #define SNMP_CREATE_EMPTY_TREE_NODE(oid) \
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| 239 | {{ SNMP_NODE_TREE, (oid) }, \
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| 240 | 0, NULL }
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| 241 |
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| 242 | /** SNMP leaf node */
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| 243 | struct snmp_leaf_node
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| 244 | {
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| 245 | /** inherited "base class" members */
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| 246 | struct snmp_node node;
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| 247 | snmp_err_t (*get_instance)(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
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| 248 | snmp_err_t (*get_next_instance)(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
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| 249 | };
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| 250 |
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| 251 | /** represents a single mib with its base oid and root node */
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| 252 | struct snmp_mib
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| 253 | {
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| 254 | const u32_t *base_oid;
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| 255 | u8_t base_oid_len;
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| 256 | const struct snmp_node *root_node;
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| 257 | };
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| 258 |
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| 259 | #define SNMP_MIB_CREATE(oid_list, root_node) { (oid_list), (u8_t)LWIP_ARRAYSIZE(oid_list), root_node }
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| 260 |
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| 261 | /** OID range structure */
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| 262 | struct snmp_oid_range
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| 263 | {
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| 264 | u32_t min;
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| 265 | u32_t max;
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| 266 | };
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| 267 |
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| 268 | /** checks if incoming OID length and values are in allowed ranges */
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| 269 | u8_t snmp_oid_in_range(const u32_t *oid_in, u8_t oid_len, const struct snmp_oid_range *oid_ranges, u8_t oid_ranges_len);
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| 270 |
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| 271 | typedef enum {
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| 272 | SNMP_NEXT_OID_STATUS_SUCCESS,
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| 273 | SNMP_NEXT_OID_STATUS_NO_MATCH,
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| 274 | SNMP_NEXT_OID_STATUS_BUF_TO_SMALL
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| 275 | } snmp_next_oid_status_t;
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| 276 |
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| 277 | /** state for next_oid_init / next_oid_check functions */
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| 278 | struct snmp_next_oid_state
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| 279 | {
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| 280 | const u32_t* start_oid;
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| 281 | u8_t start_oid_len;
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| 282 |
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| 283 | u32_t* next_oid;
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| 284 | u8_t next_oid_len;
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| 285 | u8_t next_oid_max_len;
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| 286 |
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| 287 | snmp_next_oid_status_t status;
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| 288 | void* reference;
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| 289 | };
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| 290 |
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| 291 | void snmp_next_oid_init(struct snmp_next_oid_state *state,
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| 292 | const u32_t *start_oid, u8_t start_oid_len,
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| 293 | u32_t *next_oid_buf, u8_t next_oid_max_len);
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| 294 | u8_t snmp_next_oid_precheck(struct snmp_next_oid_state *state, const u32_t *oid, u8_t oid_len);
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| 295 | u8_t snmp_next_oid_check(struct snmp_next_oid_state *state, const u32_t *oid, u8_t oid_len, void* reference);
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| 296 |
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| 297 | void snmp_oid_assign(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len);
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| 298 | void snmp_oid_combine(struct snmp_obj_id* target, const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len);
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| 299 | void snmp_oid_prefix(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len);
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| 300 | void snmp_oid_append(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len);
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| 301 | u8_t snmp_oid_equal(const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len);
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| 302 | s8_t snmp_oid_compare(const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len);
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| 303 |
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| 304 | #if LWIP_IPV4
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| 305 | u8_t snmp_oid_to_ip4(const u32_t *oid, ip4_addr_t *ip);
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| 306 | void snmp_ip4_to_oid(const ip4_addr_t *ip, u32_t *oid);
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| 307 | #endif /* LWIP_IPV4 */
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| 308 | #if LWIP_IPV6
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| 309 | u8_t snmp_oid_to_ip6(const u32_t *oid, ip6_addr_t *ip);
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| 310 | void snmp_ip6_to_oid(const ip6_addr_t *ip, u32_t *oid);
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| 311 | #endif /* LWIP_IPV6 */
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| 312 | #if LWIP_IPV4 || LWIP_IPV6
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| 313 | u8_t snmp_ip_to_oid(const ip_addr_t *ip, u32_t *oid);
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| 314 | u8_t snmp_ip_port_to_oid(const ip_addr_t *ip, u16_t port, u32_t *oid);
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| 315 |
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| 316 | u8_t snmp_oid_to_ip(const u32_t *oid, u8_t oid_len, ip_addr_t *ip);
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| 317 | u8_t snmp_oid_to_ip_port(const u32_t *oid, u8_t oid_len, ip_addr_t *ip, u16_t *port);
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| 318 | #endif /* LWIP_IPV4 || LWIP_IPV6 */
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| 319 |
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| 320 | struct netif;
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| 321 | u8_t netif_to_num(const struct netif *netif);
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| 322 |
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| 323 | snmp_err_t snmp_set_test_ok(struct snmp_node_instance* instance, u16_t value_len, void* value); /* generic function which can be used if test is always successful */
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| 324 |
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| 325 | err_t snmp_decode_bits(const u8_t *buf, u32_t buf_len, u32_t *bit_value);
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| 326 | err_t snmp_decode_truthvalue(const s32_t *asn1_value, u8_t *bool_value);
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| 327 | u8_t snmp_encode_bits(u8_t *buf, u32_t buf_len, u32_t bit_value, u8_t bit_count);
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| 328 | u8_t snmp_encode_truthvalue(s32_t *asn1_value, u32_t bool_value);
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| 329 |
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| 330 | struct snmp_statistics
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| 331 | {
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| 332 | u32_t inpkts;
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| 333 | u32_t outpkts;
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| 334 | u32_t inbadversions;
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| 335 | u32_t inbadcommunitynames;
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| 336 | u32_t inbadcommunityuses;
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| 337 | u32_t inasnparseerrs;
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| 338 | u32_t intoobigs;
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| 339 | u32_t innosuchnames;
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| 340 | u32_t inbadvalues;
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| 341 | u32_t inreadonlys;
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| 342 | u32_t ingenerrs;
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| 343 | u32_t intotalreqvars;
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| 344 | u32_t intotalsetvars;
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| 345 | u32_t ingetrequests;
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| 346 | u32_t ingetnexts;
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| 347 | u32_t insetrequests;
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| 348 | u32_t ingetresponses;
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| 349 | u32_t intraps;
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| 350 | u32_t outtoobigs;
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| 351 | u32_t outnosuchnames;
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| 352 | u32_t outbadvalues;
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| 353 | u32_t outgenerrs;
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| 354 | u32_t outgetrequests;
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| 355 | u32_t outgetnexts;
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| 356 | u32_t outsetrequests;
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| 357 | u32_t outgetresponses;
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| 358 | u32_t outtraps;
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| 359 | #if LWIP_SNMP_V3
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| 360 | u32_t unsupportedseclevels;
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| 361 | u32_t notintimewindows;
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| 362 | u32_t unknownusernames;
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| 363 | u32_t unknownengineids;
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| 364 | u32_t wrongdigests;
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| 365 | u32_t decryptionerrors;
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| 366 | #endif
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| 367 | };
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| 368 |
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| 369 | extern struct snmp_statistics snmp_stats;
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| 370 |
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| 371 | #ifdef __cplusplus
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| 372 | }
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| 373 | #endif
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| 374 |
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| 375 | #endif /* LWIP_SNMP */
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| 376 |
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| 377 | #endif /* LWIP_HDR_APPS_SNMP_CORE_H */
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