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