120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/****************************************************************************
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* libs/libc/netdb/lib_dnsbind.c
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*
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* Copyright (C) 2007, 2009, 2012, 2014-2016 Gregory Nutt.
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* All rights reserved.
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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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#include <sys/time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/net/dns.h>
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#include "netdb/lib_dns.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_NET_SOCKOPTS
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# error CONFIG_NET_SOCKOPTS required by this logic
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#endif
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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 and return a socket bound to the DNS name
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* server. The name server was previously selected via dns_server().
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* On success, the bound, non-negative socket descriptor is returned. A
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* negated errno value is returned on any failure.
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*
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****************************************************************************/
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int dns_bind(void)
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{
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struct timeval tv;
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int sd;
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int ret;
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/* Has the DNS client been properly initialized? */
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if (!dns_initialize())
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{
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nerr("ERROR: DNS client has not been initialized\n");
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return -EDESTADDRREQ;
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}
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/* Create a new socket */
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sd = socket(PF_INET, SOCK_DGRAM, 0);
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if (sd < 0)
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{
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ret = -errno;
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nerr("ERROR: socket() failed: %d\n", ret);
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return ret;
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}
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/* Set up a receive timeout */
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tv.tv_sec = CONFIG_NETDB_DNSCLIENT_RECV_TIMEOUT;
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tv.tv_usec = 0;
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ret = setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval));
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if (ret < 0)
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{
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ret = -errno;
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nerr("ERROR: setsockopt() failed: %d\n", ret);
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close(sd);
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return ret;
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}
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return sd;
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}
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