161 lines
4.7 KiB
C
161 lines
4.7 KiB
C
/****************************************************************************
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* libs/libc/netdb/lib_dnsinit.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 <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <arpa/inet.h>
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#include <nuttx/sched.h>
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#include <nuttx/mutex.h>
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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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/* Protects DNS cache, nameserver list and notify list. */
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static rmutex_t g_dns_lock = NXRMUTEX_INITIALIZER;
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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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#ifndef CONFIG_NETDB_RESOLVCONF
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int nservers;
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dns_semtake();
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nservers = g_dns_nservers;
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dns_semgive();
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/* Has at least one DNS server IP address been assigned? */
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if (nservers == 0)
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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 lock, ignoring errors due 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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nxrmutex_lock(&g_dns_lock);
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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 lock
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*
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****************************************************************************/
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void dns_semgive(void)
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{
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nxrmutex_unlock(&g_dns_lock);
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}
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