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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