120 lines
3.9 KiB
C
120 lines
3.9 KiB
C
/****************************************************************************
|
|
* libs/libc/netdb/lib_dnsbind.c
|
|
*
|
|
* Copyright (C) 2007, 2009, 2012, 2014-2016 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/time.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/net/dns.h>
|
|
|
|
#include "netdb/lib_dns.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#if CONFIG_NET_SOCKOPTS < 1
|
|
# error CONFIG_NET_SOCKOPTS required by this logic
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: dns_bind
|
|
*
|
|
* Description:
|
|
* Initialize the DNS resolver and return a socket bound to the DNS name
|
|
* server. The name server was previously selected via dns_server().
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* On success, the bound, non-negative socket descriptor is returned. A
|
|
* negated errno value is returned on any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int dns_bind(void)
|
|
{
|
|
struct timeval tv;
|
|
int errcode;
|
|
int sd;
|
|
int ret;
|
|
|
|
/* Has the DNS client been properly initialized? */
|
|
|
|
if (!dns_initialize())
|
|
{
|
|
nerr("ERROR: DNS client has not been initialized\n");
|
|
return -EDESTADDRREQ;
|
|
}
|
|
|
|
/* Create a new socket */
|
|
|
|
sd = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (sd < 0)
|
|
{
|
|
errcode = get_errno();
|
|
nerr("ERROR: socket() failed: %d\n", errcode);
|
|
return -errcode;
|
|
}
|
|
|
|
/* Set up a receive timeout */
|
|
|
|
tv.tv_sec = CONFIG_NETDB_DNSCLIENT_RECV_TIMEOUT;
|
|
tv.tv_usec = 0;
|
|
|
|
ret = setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval));
|
|
if (ret < 0)
|
|
{
|
|
errcode = get_errno();
|
|
nerr("ERROR: setsockopt() failed: %d\n", errcode);
|
|
close(sd);
|
|
return -errcode;
|
|
}
|
|
|
|
return sd;
|
|
}
|