99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
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/****************************************************************************
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* netutils/netlib/netlib_getipv4addr.c
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*
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* Copyright (C) 2007-2009, 2011, 2015 Gregory Nutt. 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/socket.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 <netinet/in.h>
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#include <nuttx/net/dns.h>
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#include <apps/netutils/netlib.h>
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NETDB_DNSCLIENT)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netlib_get_ipv4addr
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*
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* Description:
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* Get the DNS server IPv4address
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*
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* Parameters:
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* ipaddr The location to return the IPv4 address
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*
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* Return:
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* Zero (OK) is returned on success; A negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int netlib_get_ipv4dnsaddr(FAR struct in_addr *inaddr)
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{
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struct sockaddr_in addr;
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socklen_t addrlen;
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int ret = -EINVAL;
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if (inaddr)
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{
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addrlen = sizeof(struct sockaddr_in);
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ret = dns_getserver((FAR struct sockaddr *)&addr, &addrlen);
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if (ret >= 0)
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{
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/* Sanity check */
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DEBUGASSERT(addr.sin_family == AF_INET &&
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addrlen == sizeof(sizeof(struct sockaddr_in)));
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memcpy(inaddr, &addr.sin_addr, sizeof(struct in_addr));
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}
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}
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return ret;
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}
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#endif /* CONFIG_NET_IPv4 && CONFIG_NETDB_DNSCLIENT */
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