107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/****************************************************************************
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* libs/libc/netdb/lib_dnsbind.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 <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(sa_family_t family)
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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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/* Create a new socket */
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sd = socket(family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (sd < 0)
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{
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ret = -get_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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/* Set up a send timeout */
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tv.tv_sec = CONFIG_NETDB_DNSCLIENT_SEND_TIMEOUT;
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tv.tv_usec = 0;
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ret = setsockopt(sd, SOL_SOCKET, SO_SNDTIMEO, &tv,
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sizeof(struct timeval));
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}
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if (ret < 0)
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{
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ret = -get_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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