BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file |
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3 | * SNMP thread synchronization implementation. |
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4 | */ |
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5 | |||
6 | /* |
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
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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: Dirk Ziegelmeier <dziegel@gmx.de> |
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33 | */ |
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34 | |||
35 | #include "lwip/apps/snmp_opts.h" |
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36 | |||
37 | #if LWIP_SNMP && (NO_SYS == 0) /* don't build if not configured for use in lwipopts.h */ |
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38 | |||
39 | #include "lwip/apps/snmp_threadsync.h" |
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40 | #include "lwip/apps/snmp_core.h" |
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41 | #include "lwip/sys.h" |
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42 | #include <string.h> |
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43 | |||
44 | static void |
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45 | call_synced_function(struct threadsync_data *call_data, snmp_threadsync_called_fn fn) |
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46 | { |
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47 | sys_mutex_lock(&call_data->threadsync_node->instance->sem_usage_mutex); |
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48 | call_data->threadsync_node->instance->sync_fn(fn, call_data); |
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49 | sys_sem_wait(&call_data->threadsync_node->instance->sem); |
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50 | sys_mutex_unlock(&call_data->threadsync_node->instance->sem_usage_mutex); |
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51 | } |
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52 | |||
53 | static void |
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54 | threadsync_get_value_synced(void *ctx) |
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55 | { |
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56 | struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
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57 | |||
58 | call_data->retval.s16 = call_data->proxy_instance.get_value(&call_data->proxy_instance, call_data->arg1.value); |
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59 | |||
60 | sys_sem_signal(&call_data->threadsync_node->instance->sem); |
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61 | } |
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62 | |||
63 | static s16_t |
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64 | threadsync_get_value(struct snmp_node_instance *instance, void *value) |
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65 | { |
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66 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
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67 | |||
68 | call_data->arg1.value = value; |
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69 | call_synced_function(call_data, threadsync_get_value_synced); |
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70 | |||
71 | return call_data->retval.s16; |
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72 | } |
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73 | |||
74 | static void |
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75 | threadsync_set_test_synced(void *ctx) |
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76 | { |
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77 | struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
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78 | |||
79 | call_data->retval.err = call_data->proxy_instance.set_test(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value); |
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80 | |||
81 | sys_sem_signal(&call_data->threadsync_node->instance->sem); |
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82 | } |
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83 | |||
84 | static snmp_err_t |
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85 | threadsync_set_test(struct snmp_node_instance *instance, u16_t len, void *value) |
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86 | { |
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87 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
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88 | |||
89 | call_data->arg1.value = value; |
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90 | call_data->arg2.len = len; |
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91 | call_synced_function(call_data, threadsync_set_test_synced); |
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92 | |||
93 | return call_data->retval.err; |
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94 | } |
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95 | |||
96 | static void |
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97 | threadsync_set_value_synced(void *ctx) |
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98 | { |
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99 | struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
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100 | |||
101 | call_data->retval.err = call_data->proxy_instance.set_value(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value); |
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102 | |||
103 | sys_sem_signal(&call_data->threadsync_node->instance->sem); |
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104 | } |
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105 | |||
106 | static snmp_err_t |
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107 | threadsync_set_value(struct snmp_node_instance *instance, u16_t len, void *value) |
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108 | { |
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109 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
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110 | |||
111 | call_data->arg1.value = value; |
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112 | call_data->arg2.len = len; |
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113 | call_synced_function(call_data, threadsync_set_value_synced); |
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114 | |||
115 | return call_data->retval.err; |
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116 | } |
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117 | |||
118 | static void |
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119 | threadsync_release_instance_synced(void *ctx) |
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120 | { |
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121 | struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
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122 | |||
123 | call_data->proxy_instance.release_instance(&call_data->proxy_instance); |
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124 | |||
125 | sys_sem_signal(&call_data->threadsync_node->instance->sem); |
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126 | } |
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127 | |||
128 | static void |
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129 | threadsync_release_instance(struct snmp_node_instance *instance) |
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130 | { |
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131 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
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132 | |||
133 | if (call_data->proxy_instance.release_instance != NULL) { |
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134 | call_synced_function(call_data, threadsync_release_instance_synced); |
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135 | } |
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136 | } |
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137 | |||
138 | static void |
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139 | get_instance_synced(void *ctx) |
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140 | { |
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141 | struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
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142 | const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node; |
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143 | |||
144 | call_data->retval.err = leaf->get_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance); |
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145 | |||
146 | sys_sem_signal(&call_data->threadsync_node->instance->sem); |
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147 | } |
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148 | |||
149 | static void |
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150 | get_next_instance_synced(void *ctx) |
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151 | { |
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152 | struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
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153 | const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node; |
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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); |
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156 | |||
157 | sys_sem_signal(&call_data->threadsync_node->instance->sem); |
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158 | } |
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159 | |||
160 | static snmp_err_t |
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161 | do_sync(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance, snmp_threadsync_called_fn fn) |
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162 | { |
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163 | const struct snmp_threadsync_node *threadsync_node = (const struct snmp_threadsync_node *)(const void *)instance->node; |
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164 | struct threadsync_data *call_data = &threadsync_node->instance->data; |
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165 | |||
166 | if (threadsync_node->node.node.oid != threadsync_node->target->node.oid) { |
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167 | LWIP_DEBUGF(SNMP_DEBUG, ("Sync node OID does not match target node OID")); |
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168 | return SNMP_ERR_NOSUCHINSTANCE; |
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169 | } |
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170 | |||
171 | memset(&call_data->proxy_instance, 0, sizeof(call_data->proxy_instance)); |
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172 | |||
173 | instance->reference.ptr = call_data; |
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174 | snmp_oid_assign(&call_data->proxy_instance.instance_oid, instance->instance_oid.id, instance->instance_oid.len); |
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175 | |||
176 | call_data->proxy_instance.node = &threadsync_node->target->node; |
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177 | call_data->threadsync_node = threadsync_node; |
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178 | |||
179 | call_data->arg1.root_oid = root_oid; |
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180 | call_data->arg2.root_oid_len = root_oid_len; |
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181 | call_synced_function(call_data, fn); |
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182 | |||
183 | if (call_data->retval.err == SNMP_ERR_NOERROR) { |
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184 | instance->access = call_data->proxy_instance.access; |
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185 | instance->asn1_type = call_data->proxy_instance.asn1_type; |
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186 | instance->release_instance = threadsync_release_instance; |
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187 | instance->get_value = (call_data->proxy_instance.get_value != NULL) ? threadsync_get_value : NULL; |
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188 | instance->set_value = (call_data->proxy_instance.set_value != NULL) ? threadsync_set_value : NULL; |
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189 | instance->set_test = (call_data->proxy_instance.set_test != NULL) ? threadsync_set_test : NULL; |
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190 | snmp_oid_assign(&instance->instance_oid, call_data->proxy_instance.instance_oid.id, call_data->proxy_instance.instance_oid.len); |
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191 | } |
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192 | |||
193 | return call_data->retval.err; |
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194 | } |
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195 | |||
196 | snmp_err_t |
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197 | snmp_threadsync_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance) |
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198 | { |
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199 | return do_sync(root_oid, root_oid_len, instance, get_instance_synced); |
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200 | } |
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201 | |||
202 | snmp_err_t |
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203 | snmp_threadsync_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance) |
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204 | { |
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205 | return do_sync(root_oid, root_oid_len, instance, get_next_instance_synced); |
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206 | } |
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207 | |||
208 | /** Initializes thread synchronization instance */ |
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209 | void snmp_threadsync_init(struct snmp_threadsync_instance *instance, snmp_threadsync_synchronizer_fn sync_fn) |
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210 | { |
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211 | err_t err = sys_mutex_new(&instance->sem_usage_mutex); |
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212 | LWIP_ASSERT("Failed to set up mutex", err == ERR_OK); |
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213 | err = sys_sem_new(&instance->sem, 0); |
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214 | LWIP_UNUSED_ARG(err); /* in case of LWIP_NOASSERT */ |
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215 | LWIP_ASSERT("Failed to set up semaphore", err == ERR_OK); |
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216 | instance->sync_fn = sync_fn; |
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217 | } |
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218 | |||
219 | #endif /* LWIP_SNMP */ |