124 lines
4.6 KiB
C
124 lines
4.6 KiB
C
/****************************************************************************
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* libc/netdb/dns_resolver.c
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* DNS host name to IP address resolver.
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*
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* The uIP DNS resolver functions are used to lookup a hostname and
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* map it to a numerical IP address. It maintains a list of resolved
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* hostnames that can be queried. New hostnames can be resolved using the
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* dns_whois() function.
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*
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* Copyright (C) 2007, 2009, 2012, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Based heavily on portions of uIP:
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*
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* Author: Adam Dunkels <adam@dunkels.com>
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* Copyright (c) 2002-2003, Adam Dunkels.
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE 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 <netinet/in.h>
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#include <nuttx/net/dnsclient.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static int g_sockfd = -1;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dns_bind
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*
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* Description:
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* Initialize the DNS resolver using an internal, share-able socket.
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*
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****************************************************************************/
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int dns_bind(void)
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{
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return dns_bind_sock(&g_sockfd);
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}
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/****************************************************************************
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* Name: dns_query
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*
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* Description:
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* Using the internal DNS resolver socket, look up the the 'hostname', and
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* return its IP address in 'ipaddr'
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*
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* Returned Value:
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* Returns zero (OK) if the query was successful.
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*
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****************************************************************************/
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int dns_query(FAR const char *hostname, FAR in_addr_t *ipaddr)
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{
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return dns_query_sock(g_sockfd, hostname, ipaddr);
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}
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/****************************************************************************
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* Name: dns_whois
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*
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* Description:
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* Get the binding for 'name' using the DNS server accessed via the DNS
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* resolvers internal socket.
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*
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****************************************************************************/
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#ifdef CONFIG_NETDB_DNSCLIENT_IPv6
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int dns_whois(FAR const char *name, FAR struct sockaddr_in6 *addr)
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#else
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int dns_whois(FAR const char *name, FAR struct sockaddr_in *addr)
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#endif
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{
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return dns_whois_socket(g_sockfd, name, addr);
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}
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