101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
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/****************************************************************************
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* libs/libc/netdb/lib_dnsqueryfamily.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/types.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include "netdb/lib_dns.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static int g_query_family = AF_UNSPEC;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dns_is_queryfamily
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*
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* Description:
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* Determine if the specified address family is available for DNS query.
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*
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****************************************************************************/
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bool dns_is_queryfamily(sa_family_t family)
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{
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DEBUGASSERT(family == AF_INET || family == AF_INET6);
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return g_query_family == AF_UNSPEC || g_query_family == family;
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}
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/****************************************************************************
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* Name: dns_set_queryfamily
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*
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* Description:
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* Configure the address family to be used for queries.
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*
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****************************************************************************/
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int dns_set_queryfamily(sa_family_t family)
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{
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int ret = OK;
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switch (family)
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{
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#ifdef CONFIG_NET_IPv4
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case AF_INET:
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#endif
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#ifdef CONFIG_NET_IPv6
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case AF_INET6:
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#endif
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case AF_UNSPEC:
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if (g_query_family != family)
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{
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dns_lock();
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g_query_family = family;
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dns_unlock();
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#if CONFIG_NETDB_DNSCLIENT_ENTRIES > 0
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dns_clear_answer();
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#endif
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ninfo("Configure address family for dns query: %d\n", family);
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}
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break;
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default:
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nerr("ERROR: Unsupported family: %d\n", family);
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ret = -ENOSYS;
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break;
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}
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return ret;
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}
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