151 lines
4.8 KiB
C
151 lines
4.8 KiB
C
/****************************************************************************
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* libs/libc/netdb/lib_dnsnotify.c
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*
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* Copyright (C) 2019 Pinecone Inc. All rights reserved.
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* Author: Xiang Xiao <xiaoxiang@pinecone.net>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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, 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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