137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/****************************************************************************
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* libs/libc/netdb/lib_dnsnotify.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/net/dns.h>
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#include <queue.h>
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#include "libc.h"
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#include "netdb/lib_dns.h"
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#ifdef CONFIG_NETDB_DNSCLIENT
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/****************************************************************************
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* Private Type Definitions
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****************************************************************************/
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struct dns_notify_s
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{
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struct dq_entry_s entry; /* Supports a doubly linked list */
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dns_callback_t callback;
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FAR void *arg;
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static dq_queue_t g_dns_notify;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dns_register_notify
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*
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* Description:
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* This function is called in order to receive the nameserver change.
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*
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****************************************************************************/
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int dns_register_notify(dns_callback_t callback, FAR void *arg)
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{
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FAR struct dns_notify_s *notify;
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notify = lib_malloc(sizeof(*notify));
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if (notify == NULL)
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{
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return -ENOMEM;
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}
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notify->callback = callback;
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notify->arg = arg;
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dns_semtake();
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dq_addlast(¬ify->entry, &g_dns_notify);
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dns_semgive();
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/* Notify the existed nameserver */
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dns_foreach_nameserver(callback, arg);
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return OK;
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}
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/****************************************************************************
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* Name: dns_unregister_notify
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*
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* Description:
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* This function is called in order to unsubscribe the notification.
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*
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****************************************************************************/
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int dns_unregister_notify(dns_callback_t callback, FAR void *arg)
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{
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FAR dq_entry_t *entry;
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dns_semtake();
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for (entry = dq_peek(&g_dns_notify); entry; entry = dq_next(entry))
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{
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FAR struct dns_notify_s *notify = (FAR struct dns_notify_s *)entry;
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if (notify->callback == callback && notify->arg == arg)
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{
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dq_rem(¬ify->entry, &g_dns_notify);
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dns_semgive();
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lib_free(notify);
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return OK;
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}
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}
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dns_semgive();
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return -EINVAL;
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}
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/****************************************************************************
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* Name: dns_notify_nameserver
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****************************************************************************/
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void dns_notify_nameserver(FAR const struct sockaddr *addr,
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socklen_t addrlen)
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{
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FAR dq_entry_t *entry;
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dns_semtake();
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for (entry = dq_peek(&g_dns_notify); entry; entry = dq_next(entry))
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{
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FAR struct dns_notify_s *notify = (FAR struct dns_notify_s *)entry;
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notify->callback(notify->arg, (FAR struct sockaddr *)addr, addrlen);
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}
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dns_semgive();
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}
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#endif /* CONFIG_NETDB_DNSCLIENT */
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