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1 office 1 /**
2 * @file
3 * SNMP thread synchronization 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 * Author: Dirk Ziegelmeier <dziegel@gmx.de>
33 */
34  
35 #include "lwip/apps/snmp_opts.h"
36  
37 #if LWIP_SNMP && (NO_SYS == 0) /* don't build if not configured for use in lwipopts.h */
38  
39 #include "lwip/apps/snmp_threadsync.h"
40 #include "lwip/apps/snmp_core.h"
41 #include "lwip/sys.h"
42 #include <string.h>
43  
44 static void
45 call_synced_function(struct threadsync_data *call_data, snmp_threadsync_called_fn fn)
46 {
47 sys_mutex_lock(&call_data->threadsync_node->instance->sem_usage_mutex);
48 call_data->threadsync_node->instance->sync_fn(fn, call_data);
49 sys_sem_wait(&call_data->threadsync_node->instance->sem);
50 sys_mutex_unlock(&call_data->threadsync_node->instance->sem_usage_mutex);
51 }
52  
53 static void
54 threadsync_get_value_synced(void *ctx)
55 {
56 struct threadsync_data *call_data = (struct threadsync_data *)ctx;
57  
58 call_data->retval.s16 = call_data->proxy_instance.get_value(&call_data->proxy_instance, call_data->arg1.value);
59  
60 sys_sem_signal(&call_data->threadsync_node->instance->sem);
61 }
62  
63 static s16_t
64 threadsync_get_value(struct snmp_node_instance *instance, void *value)
65 {
66 struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
67  
68 call_data->arg1.value = value;
69 call_synced_function(call_data, threadsync_get_value_synced);
70  
71 return call_data->retval.s16;
72 }
73  
74 static void
75 threadsync_set_test_synced(void *ctx)
76 {
77 struct threadsync_data *call_data = (struct threadsync_data *)ctx;
78  
79 call_data->retval.err = call_data->proxy_instance.set_test(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value);
80  
81 sys_sem_signal(&call_data->threadsync_node->instance->sem);
82 }
83  
84 static snmp_err_t
85 threadsync_set_test(struct snmp_node_instance *instance, u16_t len, void *value)
86 {
87 struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
88  
89 call_data->arg1.value = value;
90 call_data->arg2.len = len;
91 call_synced_function(call_data, threadsync_set_test_synced);
92  
93 return call_data->retval.err;
94 }
95  
96 static void
97 threadsync_set_value_synced(void *ctx)
98 {
99 struct threadsync_data *call_data = (struct threadsync_data *)ctx;
100  
101 call_data->retval.err = call_data->proxy_instance.set_value(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value);
102  
103 sys_sem_signal(&call_data->threadsync_node->instance->sem);
104 }
105  
106 static snmp_err_t
107 threadsync_set_value(struct snmp_node_instance *instance, u16_t len, void *value)
108 {
109 struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
110  
111 call_data->arg1.value = value;
112 call_data->arg2.len = len;
113 call_synced_function(call_data, threadsync_set_value_synced);
114  
115 return call_data->retval.err;
116 }
117  
118 static void
119 threadsync_release_instance_synced(void *ctx)
120 {
121 struct threadsync_data *call_data = (struct threadsync_data *)ctx;
122  
123 call_data->proxy_instance.release_instance(&call_data->proxy_instance);
124  
125 sys_sem_signal(&call_data->threadsync_node->instance->sem);
126 }
127  
128 static void
129 threadsync_release_instance(struct snmp_node_instance *instance)
130 {
131 struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
132  
133 if (call_data->proxy_instance.release_instance != NULL) {
134 call_synced_function(call_data, threadsync_release_instance_synced);
135 }
136 }
137  
138 static void
139 get_instance_synced(void *ctx)
140 {
141 struct threadsync_data *call_data = (struct threadsync_data *)ctx;
142 const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node;
143  
144 call_data->retval.err = leaf->get_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance);
145  
146 sys_sem_signal(&call_data->threadsync_node->instance->sem);
147 }
148  
149 static void
150 get_next_instance_synced(void *ctx)
151 {
152 struct threadsync_data *call_data = (struct threadsync_data *)ctx;
153 const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node;
154  
155 call_data->retval.err = leaf->get_next_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance);
156  
157 sys_sem_signal(&call_data->threadsync_node->instance->sem);
158 }
159  
160 static snmp_err_t
161 do_sync(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance, snmp_threadsync_called_fn fn)
162 {
163 const struct snmp_threadsync_node *threadsync_node = (const struct snmp_threadsync_node *)(const void *)instance->node;
164 struct threadsync_data *call_data = &threadsync_node->instance->data;
165  
166 if (threadsync_node->node.node.oid != threadsync_node->target->node.oid) {
167 LWIP_DEBUGF(SNMP_DEBUG, ("Sync node OID does not match target node OID"));
168 return SNMP_ERR_NOSUCHINSTANCE;
169 }
170  
171 memset(&call_data->proxy_instance, 0, sizeof(call_data->proxy_instance));
172  
173 instance->reference.ptr = call_data;
174 snmp_oid_assign(&call_data->proxy_instance.instance_oid, instance->instance_oid.id, instance->instance_oid.len);
175  
176 call_data->proxy_instance.node = &threadsync_node->target->node;
177 call_data->threadsync_node = threadsync_node;
178  
179 call_data->arg1.root_oid = root_oid;
180 call_data->arg2.root_oid_len = root_oid_len;
181 call_synced_function(call_data, fn);
182  
183 if (call_data->retval.err == SNMP_ERR_NOERROR) {
184 instance->access = call_data->proxy_instance.access;
185 instance->asn1_type = call_data->proxy_instance.asn1_type;
186 instance->release_instance = threadsync_release_instance;
187 instance->get_value = (call_data->proxy_instance.get_value != NULL) ? threadsync_get_value : NULL;
188 instance->set_value = (call_data->proxy_instance.set_value != NULL) ? threadsync_set_value : NULL;
189 instance->set_test = (call_data->proxy_instance.set_test != NULL) ? threadsync_set_test : NULL;
190 snmp_oid_assign(&instance->instance_oid, call_data->proxy_instance.instance_oid.id, call_data->proxy_instance.instance_oid.len);
191 }
192  
193 return call_data->retval.err;
194 }
195  
196 snmp_err_t
197 snmp_threadsync_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
198 {
199 return do_sync(root_oid, root_oid_len, instance, get_instance_synced);
200 }
201  
202 snmp_err_t
203 snmp_threadsync_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
204 {
205 return do_sync(root_oid, root_oid_len, instance, get_next_instance_synced);
206 }
207  
208 /** Initializes thread synchronization instance */
209 void snmp_threadsync_init(struct snmp_threadsync_instance *instance, snmp_threadsync_synchronizer_fn sync_fn)
210 {
211 err_t err = sys_mutex_new(&instance->sem_usage_mutex);
212 LWIP_ASSERT("Failed to set up mutex", err == ERR_OK);
213 err = sys_sem_new(&instance->sem, 0);
214 LWIP_UNUSED_ARG(err); /* in case of LWIP_NOASSERT */
215 LWIP_ASSERT("Failed to set up semaphore", err == ERR_OK);
216 instance->sync_fn = sync_fn;
217 }
218  
219 #endif /* LWIP_SNMP */