1 | /**
|
---|
2 | * @file
|
---|
3 | * SNMP scalar node support implementation.
|
---|
4 | */
|
---|
5 |
|
---|
6 | /*
|
---|
7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
|
---|
8 | * All rights reserved.
|
---|
9 | *
|
---|
10 | * Redistribution and use in source and binary forms, with or without modification,
|
---|
11 | * are permitted provided that the following conditions are met:
|
---|
12 | *
|
---|
13 | * 1. Redistributions of source code must retain the above copyright notice,
|
---|
14 | * this list of conditions and the following disclaimer.
|
---|
15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
|
---|
16 | * this list of conditions and the following disclaimer in the documentation
|
---|
17 | * and/or other materials provided with the distribution.
|
---|
18 | * 3. The name of the author may not be used to endorse or promote products
|
---|
19 | * derived from this software without specific prior written permission.
|
---|
20 | *
|
---|
21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
---|
22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
---|
23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
---|
24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
---|
25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
---|
26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
---|
27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
---|
28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
---|
29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
---|
30 | * OF SUCH DAMAGE.
|
---|
31 | *
|
---|
32 | * This file is part of the lwIP TCP/IP stack.
|
---|
33 | *
|
---|
34 | * Author: Martin Hentschel <info@cl-soft.de>
|
---|
35 | *
|
---|
36 | */
|
---|
37 |
|
---|
38 | #include "lwip/apps/snmp_opts.h"
|
---|
39 |
|
---|
40 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
|
---|
41 |
|
---|
42 | #include "lwip/apps/snmp_scalar.h"
|
---|
43 | #include "lwip/apps/snmp_core.h"
|
---|
44 |
|
---|
45 | static s16_t snmp_scalar_array_get_value(struct snmp_node_instance *instance, void *value);
|
---|
46 | static snmp_err_t snmp_scalar_array_set_test(struct snmp_node_instance *instance, u16_t value_len, void *value);
|
---|
47 | static snmp_err_t snmp_scalar_array_set_value(struct snmp_node_instance *instance, u16_t value_len, void *value);
|
---|
48 |
|
---|
49 | snmp_err_t
|
---|
50 | snmp_scalar_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
|
---|
51 | {
|
---|
52 | const struct snmp_scalar_node *scalar_node = (const struct snmp_scalar_node *)(const void *)instance->node;
|
---|
53 |
|
---|
54 | LWIP_UNUSED_ARG(root_oid);
|
---|
55 | LWIP_UNUSED_ARG(root_oid_len);
|
---|
56 |
|
---|
57 | /* scalar only has one dedicated instance: .0 */
|
---|
58 | if ((instance->instance_oid.len != 1) || (instance->instance_oid.id[0] != 0)) {
|
---|
59 | return SNMP_ERR_NOSUCHINSTANCE;
|
---|
60 | }
|
---|
61 |
|
---|
62 | instance->access = scalar_node->access;
|
---|
63 | instance->asn1_type = scalar_node->asn1_type;
|
---|
64 | instance->get_value = scalar_node->get_value;
|
---|
65 | instance->set_test = scalar_node->set_test;
|
---|
66 | instance->set_value = scalar_node->set_value;
|
---|
67 | return SNMP_ERR_NOERROR;
|
---|
68 | }
|
---|
69 |
|
---|
70 | snmp_err_t
|
---|
71 | snmp_scalar_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
|
---|
72 | {
|
---|
73 | /* because our only instance is .0 we can only return a next instance if no instance oid is passed */
|
---|
74 | if (instance->instance_oid.len == 0) {
|
---|
75 | instance->instance_oid.len = 1;
|
---|
76 | instance->instance_oid.id[0] = 0;
|
---|
77 |
|
---|
78 | return snmp_scalar_get_instance(root_oid, root_oid_len, instance);
|
---|
79 | }
|
---|
80 |
|
---|
81 | return SNMP_ERR_NOSUCHINSTANCE;
|
---|
82 | }
|
---|
83 |
|
---|
84 |
|
---|
85 | snmp_err_t
|
---|
86 | snmp_scalar_array_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
|
---|
87 | {
|
---|
88 | LWIP_UNUSED_ARG(root_oid);
|
---|
89 | LWIP_UNUSED_ARG(root_oid_len);
|
---|
90 |
|
---|
91 | if ((instance->instance_oid.len == 2) && (instance->instance_oid.id[1] == 0)) {
|
---|
92 | const struct snmp_scalar_array_node *array_node = (const struct snmp_scalar_array_node *)(const void *)instance->node;
|
---|
93 | const struct snmp_scalar_array_node_def *array_node_def = array_node->array_nodes;
|
---|
94 | u32_t i = 0;
|
---|
95 |
|
---|
96 | while (i < array_node->array_node_count) {
|
---|
97 | if (array_node_def->oid == instance->instance_oid.id[0]) {
|
---|
98 | break;
|
---|
99 | }
|
---|
100 |
|
---|
101 | array_node_def++;
|
---|
102 | i++;
|
---|
103 | }
|
---|
104 |
|
---|
105 | if (i < array_node->array_node_count) {
|
---|
106 | instance->access = array_node_def->access;
|
---|
107 | instance->asn1_type = array_node_def->asn1_type;
|
---|
108 | instance->get_value = snmp_scalar_array_get_value;
|
---|
109 | instance->set_test = snmp_scalar_array_set_test;
|
---|
110 | instance->set_value = snmp_scalar_array_set_value;
|
---|
111 | instance->reference.const_ptr = array_node_def;
|
---|
112 |
|
---|
113 | return SNMP_ERR_NOERROR;
|
---|
114 | }
|
---|
115 | }
|
---|
116 |
|
---|
117 | return SNMP_ERR_NOSUCHINSTANCE;
|
---|
118 | }
|
---|
119 |
|
---|
120 | snmp_err_t
|
---|
121 | snmp_scalar_array_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
|
---|
122 | {
|
---|
123 | const struct snmp_scalar_array_node *array_node = (const struct snmp_scalar_array_node *)(const void *)instance->node;
|
---|
124 | const struct snmp_scalar_array_node_def *array_node_def = array_node->array_nodes;
|
---|
125 | const struct snmp_scalar_array_node_def *result = NULL;
|
---|
126 |
|
---|
127 | LWIP_UNUSED_ARG(root_oid);
|
---|
128 | LWIP_UNUSED_ARG(root_oid_len);
|
---|
129 |
|
---|
130 | if ((instance->instance_oid.len == 0) && (array_node->array_node_count > 0)) {
|
---|
131 | /* return node with lowest OID */
|
---|
132 | u16_t i = 0;
|
---|
133 |
|
---|
134 | result = array_node_def;
|
---|
135 | array_node_def++;
|
---|
136 |
|
---|
137 | for (i = 1; i < array_node->array_node_count; i++) {
|
---|
138 | if (array_node_def->oid < result->oid) {
|
---|
139 | result = array_node_def;
|
---|
140 | }
|
---|
141 | array_node_def++;
|
---|
142 | }
|
---|
143 | } else if (instance->instance_oid.len >= 1) {
|
---|
144 | if (instance->instance_oid.len == 1) {
|
---|
145 | /* if we have the requested OID we return its instance, otherwise we search for the next available */
|
---|
146 | u16_t i = 0;
|
---|
147 | while (i < array_node->array_node_count) {
|
---|
148 | if (array_node_def->oid == instance->instance_oid.id[0]) {
|
---|
149 | result = array_node_def;
|
---|
150 | break;
|
---|
151 | }
|
---|
152 |
|
---|
153 | array_node_def++;
|
---|
154 | i++;
|
---|
155 | }
|
---|
156 | }
|
---|
157 | if (result == NULL) {
|
---|
158 | u32_t oid_dist = 0xFFFFFFFFUL;
|
---|
159 | u16_t i = 0;
|
---|
160 | array_node_def = array_node->array_nodes; /* may be already at the end when if case before was executed without result -> reinitialize to start */
|
---|
161 | while (i < array_node->array_node_count) {
|
---|
162 | if ((array_node_def->oid > instance->instance_oid.id[0]) &&
|
---|
163 | ((u32_t)(array_node_def->oid - instance->instance_oid.id[0]) < oid_dist)) {
|
---|
164 | result = array_node_def;
|
---|
165 | oid_dist = array_node_def->oid - instance->instance_oid.id[0];
|
---|
166 | }
|
---|
167 |
|
---|
168 | array_node_def++;
|
---|
169 | i++;
|
---|
170 | }
|
---|
171 | }
|
---|
172 | }
|
---|
173 |
|
---|
174 | if (result == NULL) {
|
---|
175 | /* nothing to return */
|
---|
176 | return SNMP_ERR_NOSUCHINSTANCE;
|
---|
177 | }
|
---|
178 |
|
---|
179 | instance->instance_oid.len = 2;
|
---|
180 | instance->instance_oid.id[0] = result->oid;
|
---|
181 | instance->instance_oid.id[1] = 0;
|
---|
182 |
|
---|
183 | instance->access = result->access;
|
---|
184 | instance->asn1_type = result->asn1_type;
|
---|
185 | instance->get_value = snmp_scalar_array_get_value;
|
---|
186 | instance->set_test = snmp_scalar_array_set_test;
|
---|
187 | instance->set_value = snmp_scalar_array_set_value;
|
---|
188 | instance->reference.const_ptr = result;
|
---|
189 |
|
---|
190 | return SNMP_ERR_NOERROR;
|
---|
191 | }
|
---|
192 |
|
---|
193 | static s16_t
|
---|
194 | snmp_scalar_array_get_value(struct snmp_node_instance *instance, void *value)
|
---|
195 | {
|
---|
196 | s16_t result = -1;
|
---|
197 | const struct snmp_scalar_array_node *array_node = (const struct snmp_scalar_array_node *)(const void *)instance->node;
|
---|
198 | const struct snmp_scalar_array_node_def *array_node_def = (const struct snmp_scalar_array_node_def *)instance->reference.const_ptr;
|
---|
199 |
|
---|
200 | if (array_node->get_value != NULL) {
|
---|
201 | result = array_node->get_value(array_node_def, value);
|
---|
202 | }
|
---|
203 | return result;
|
---|
204 | }
|
---|
205 |
|
---|
206 | static snmp_err_t
|
---|
207 | snmp_scalar_array_set_test(struct snmp_node_instance *instance, u16_t value_len, void *value)
|
---|
208 | {
|
---|
209 | snmp_err_t result = SNMP_ERR_NOTWRITABLE;
|
---|
210 | const struct snmp_scalar_array_node *array_node = (const struct snmp_scalar_array_node *)(const void *)instance->node;
|
---|
211 | const struct snmp_scalar_array_node_def *array_node_def = (const struct snmp_scalar_array_node_def *)instance->reference.const_ptr;
|
---|
212 |
|
---|
213 | if (array_node->set_test != NULL) {
|
---|
214 | result = array_node->set_test(array_node_def, value_len, value);
|
---|
215 | }
|
---|
216 | return result;
|
---|
217 | }
|
---|
218 |
|
---|
219 | static snmp_err_t
|
---|
220 | snmp_scalar_array_set_value(struct snmp_node_instance *instance, u16_t value_len, void *value)
|
---|
221 | {
|
---|
222 | snmp_err_t result = SNMP_ERR_NOTWRITABLE;
|
---|
223 | const struct snmp_scalar_array_node *array_node = (const struct snmp_scalar_array_node *)(const void *)instance->node;
|
---|
224 | const struct snmp_scalar_array_node_def *array_node_def = (const struct snmp_scalar_array_node_def *)instance->reference.const_ptr;
|
---|
225 |
|
---|
226 | if (array_node->set_value != NULL) {
|
---|
227 | result = array_node->set_value(array_node_def, value_len, value);
|
---|
228 | }
|
---|
229 | return result;
|
---|
230 | }
|
---|
231 |
|
---|
232 | #endif /* LWIP_SNMP */
|
---|