| /** |
| * @file |
| * SNMP thread synchronization implementation. |
| */ |
| |
| /* |
| * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| * |
| * Author: Dirk Ziegelmeier <dziegel@gmx.de> |
| */ |
| |
| #include "lwip/apps/snmp_opts.h" |
| |
| #if LWIP_SNMP && (NO_SYS == 0) /* don't build if not configured for use in lwipopts.h */ |
| |
| #include "lwip/apps/snmp_threadsync.h" |
| #include "lwip/apps/snmp_core.h" |
| #include "lwip/sys.h" |
| #include <string.h> |
| |
| static void |
| call_synced_function(struct threadsync_data *call_data, snmp_threadsync_called_fn fn) |
| { |
| sys_mutex_lock(&call_data->threadsync_node->instance->sem_usage_mutex); |
| call_data->threadsync_node->instance->sync_fn(fn, call_data); |
| sys_sem_wait(&call_data->threadsync_node->instance->sem); |
| sys_mutex_unlock(&call_data->threadsync_node->instance->sem_usage_mutex); |
| } |
| |
| static void |
| threadsync_get_value_synced(void *ctx) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
| |
| if (call_data->proxy_instance.get_value != NULL) { |
| call_data->retval.s16 = call_data->proxy_instance.get_value(&call_data->proxy_instance, call_data->arg1.value); |
| } else { |
| call_data->retval.s16 = -1; |
| } |
| |
| sys_sem_signal(&call_data->threadsync_node->instance->sem); |
| } |
| |
| static s16_t |
| threadsync_get_value(struct snmp_node_instance *instance, void *value) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
| |
| call_data->arg1.value = value; |
| call_synced_function(call_data, threadsync_get_value_synced); |
| |
| return call_data->retval.s16; |
| } |
| |
| static void |
| threadsync_set_test_synced(void *ctx) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
| |
| if (call_data->proxy_instance.set_test != NULL) { |
| call_data->retval.err = call_data->proxy_instance.set_test(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value); |
| } else { |
| call_data->retval.err = SNMP_ERR_NOTWRITABLE; |
| } |
| |
| sys_sem_signal(&call_data->threadsync_node->instance->sem); |
| } |
| |
| static snmp_err_t |
| threadsync_set_test(struct snmp_node_instance *instance, u16_t len, void *value) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
| |
| call_data->arg1.value = value; |
| call_data->arg2.len = len; |
| call_synced_function(call_data, threadsync_set_test_synced); |
| |
| return call_data->retval.err; |
| } |
| |
| static void |
| threadsync_set_value_synced(void *ctx) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
| |
| if (call_data->proxy_instance.set_value != NULL) { |
| call_data->retval.err = call_data->proxy_instance.set_value(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value); |
| } else { |
| call_data->retval.err = SNMP_ERR_NOTWRITABLE; |
| } |
| |
| sys_sem_signal(&call_data->threadsync_node->instance->sem); |
| } |
| |
| static snmp_err_t |
| threadsync_set_value(struct snmp_node_instance *instance, u16_t len, void *value) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
| |
| call_data->arg1.value = value; |
| call_data->arg2.len = len; |
| call_synced_function(call_data, threadsync_set_value_synced); |
| |
| return call_data->retval.err; |
| } |
| |
| static void |
| threadsync_release_instance_synced(void *ctx) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
| |
| call_data->proxy_instance.release_instance(&call_data->proxy_instance); |
| |
| sys_sem_signal(&call_data->threadsync_node->instance->sem); |
| } |
| |
| static void |
| threadsync_release_instance(struct snmp_node_instance *instance) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr; |
| |
| if (call_data->proxy_instance.release_instance != NULL) { |
| call_synced_function(call_data, threadsync_release_instance_synced); |
| } |
| } |
| |
| static void |
| get_instance_synced(void *ctx) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
| const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node; |
| |
| call_data->retval.err = leaf->get_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance); |
| |
| sys_sem_signal(&call_data->threadsync_node->instance->sem); |
| } |
| |
| static void |
| get_next_instance_synced(void *ctx) |
| { |
| struct threadsync_data *call_data = (struct threadsync_data *)ctx; |
| const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node; |
| |
| call_data->retval.err = leaf->get_next_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance); |
| |
| sys_sem_signal(&call_data->threadsync_node->instance->sem); |
| } |
| |
| static snmp_err_t |
| do_sync(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance, snmp_threadsync_called_fn fn) |
| { |
| const struct snmp_threadsync_node *threadsync_node = (const struct snmp_threadsync_node *)(const void *)instance->node; |
| struct threadsync_data *call_data = &threadsync_node->instance->data; |
| |
| if (threadsync_node->node.node.oid != threadsync_node->target->node.oid) { |
| LWIP_DEBUGF(SNMP_DEBUG, ("Sync node OID does not match target node OID")); |
| return SNMP_ERR_NOSUCHINSTANCE; |
| } |
| |
| memset(&call_data->proxy_instance, 0, sizeof(call_data->proxy_instance)); |
| |
| instance->reference.ptr = call_data; |
| snmp_oid_assign(&call_data->proxy_instance.instance_oid, instance->instance_oid.id, instance->instance_oid.len); |
| |
| call_data->proxy_instance.node = &threadsync_node->target->node; |
| call_data->threadsync_node = threadsync_node; |
| |
| call_data->arg1.root_oid = root_oid; |
| call_data->arg2.root_oid_len = root_oid_len; |
| call_synced_function(call_data, fn); |
| |
| if (call_data->retval.err == SNMP_ERR_NOERROR) { |
| instance->access = call_data->proxy_instance.access; |
| instance->asn1_type = call_data->proxy_instance.asn1_type; |
| instance->release_instance = threadsync_release_instance; |
| instance->get_value = (call_data->proxy_instance.get_value != NULL) ? threadsync_get_value : NULL; |
| instance->set_value = (call_data->proxy_instance.set_value != NULL) ? threadsync_set_value : NULL; |
| instance->set_test = (call_data->proxy_instance.set_test != NULL) ? threadsync_set_test : NULL; |
| snmp_oid_assign(&instance->instance_oid, call_data->proxy_instance.instance_oid.id, call_data->proxy_instance.instance_oid.len); |
| } |
| |
| return call_data->retval.err; |
| } |
| |
| snmp_err_t |
| snmp_threadsync_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance) |
| { |
| return do_sync(root_oid, root_oid_len, instance, get_instance_synced); |
| } |
| |
| snmp_err_t |
| snmp_threadsync_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance) |
| { |
| return do_sync(root_oid, root_oid_len, instance, get_next_instance_synced); |
| } |
| |
| /** Initializes thread synchronization instance */ |
| void snmp_threadsync_init(struct snmp_threadsync_instance *instance, snmp_threadsync_synchronizer_fn sync_fn) |
| { |
| err_t err = sys_mutex_new(&instance->sem_usage_mutex); |
| LWIP_ASSERT("Failed to set up mutex", err == ERR_OK); |
| err = sys_sem_new(&instance->sem, 0); |
| LWIP_UNUSED_ARG(err); /* in case of LWIP_NOASSERT */ |
| LWIP_ASSERT("Failed to set up semaphore", err == ERR_OK); |
| instance->sync_fn = sync_fn; |
| } |
| |
| #endif /* LWIP_SNMP */ |