2016-01-14 17:17:15 +01:00
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/****************************************************************************
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* libc/netdb/lib_dnscache.c
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*
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2017-10-08 19:52:32 +02:00
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* Copyright (C) 2007, 2009, 2012, 2014-2017 Gregory Nutt. All rights reserved.
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2016-01-14 17:17:15 +01:00
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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2017-04-03 01:46:22 +02:00
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#include <string.h>
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2016-01-14 17:17:15 +01:00
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#include <semaphore.h>
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#include <errno.h>
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#include <assert.h>
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2016-01-14 22:12:42 +01:00
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#include <arpa/inet.h>
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2017-10-08 19:52:32 +02:00
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#include <nuttx/semaphore.h>
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2016-01-14 17:17:15 +01:00
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#include "netdb/lib_dns.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static sem_t g_dns_sem; /* Protects g_seqno and DNS cache */
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static bool g_dns_initialized; /* DNS data structures initialized */
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#if defined(CONFIG_NETDB_DNSSERVER_IPv6) && !defined(CONFIG_NETDB_RESOLVCONF)
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/* This is the default IPv6 DNS server address */
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static const uint16_t g_ipv6_hostaddr[8] =
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{
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_1),
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_2),
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_3),
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_4),
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_5),
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_6),
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_7),
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HTONS(CONFIG_NETDB_DNSSERVER_IPv6ADDR_8)
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};
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dns_initialize
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*
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* Description:
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* Make sure that the DNS client has been properly initialized for use.
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*
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****************************************************************************/
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bool dns_initialize(void)
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{
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/* Have DNS data structures been initialized? */
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if (!g_dns_initialized)
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{
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2017-10-08 19:52:32 +02:00
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(void)nxsem_init(&g_dns_sem, 0, 1);
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2016-01-14 17:17:15 +01:00
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g_dns_initialized = true;
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}
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#ifndef CONFIG_NETDB_RESOLVCONF
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/* Has the DNS server IP address been assigned? */
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if (!g_dns_address)
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{
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#if defined(CONFIG_NETDB_DNSSERVER_IPv4)
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struct sockaddr_in addr4;
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int ret;
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/* No, configure the default IPv4 DNS server address */
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addr4.sin_family = AF_INET;
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addr4.sin_port = HTONS(DNS_DEFAULT_PORT);
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addr4.sin_addr.s_addr = HTONL(CONFIG_NETDB_DNSSERVER_IPv4ADDR);
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ret = dns_add_nameserver((FAR struct sockaddr *)&addr4,
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sizeof(struct sockaddr_in));
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if (ret < 0)
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{
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return false;
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}
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#elif defined(CONFIG_NETDB_DNSSERVER_IPv6)
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struct sockaddr_in6 addr6;
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int ret;
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/* No, configure the default IPv6 DNS server address */
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addr6.sin6_family = AF_INET6;
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addr6.sin6_port = HTONS(DNS_DEFAULT_PORT);
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memcpy(addr6.sin6_addr.s6_addr, g_ipv6_hostaddr, 16);
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ret = dns_add_nameserver((FAR struct sockaddr *)&addr6,
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sizeof(struct sockaddr_in6));
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if (ret < 0)
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{
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return false;
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}
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#else
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/* Then we are not ready to perform DNS queries */
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return false;
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#endif
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}
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#endif /* !CONFIG_NETDB_RESOLVCONF */
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return true;
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}
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/****************************************************************************
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* Name: dns_semtake
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*
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* Description:
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* Take the DNS semaphore, ignoring errors do to the receipt of signals.
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*
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****************************************************************************/
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void dns_semtake(void)
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{
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int errcode = 0;
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int ret;
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do
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{
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2017-10-08 19:52:32 +02:00
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ret = _SEM_WAIT(&g_dns_sem);
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2016-01-14 17:17:15 +01:00
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if (ret < 0)
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{
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2017-10-08 19:52:32 +02:00
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errcode = SEM_ERRNO(ret);
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2016-01-14 17:17:15 +01:00
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DEBUGASSERT(errcode == EINTR);
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}
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}
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while (ret < 0 && errcode == EINTR);
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}
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/****************************************************************************
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* Name: dns_semgive
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*
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* Description:
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* Release the DNS semaphore
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*
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****************************************************************************/
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void dns_semgive(void)
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{
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2017-10-08 19:52:32 +02:00
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DEBUGVERIFY(_SEM_POST(&g_dns_sem));
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2016-01-14 17:17:15 +01:00
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}
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