dfa3bbbf00
Motivation: RFC7871 defines an extension which allows to request responses for a given subset. Modifications: - Add DnsOptPseudoRrRecord which can act as base class for extensions based on EDNS(0) as defined in RFC6891 - Add DnsOptEcsRecord to support the Client Subnet in DNS Queries extension - Add tests Result: Client Subnet in DNS Queries extension is now supported.
105 lines
3.4 KiB
Java
105 lines
3.4 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the 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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package io.netty.handler.codec.dns;
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import io.netty.channel.socket.InternetProtocolFamily;
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import io.netty.util.internal.UnstableApi;
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import java.net.InetAddress;
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import java.util.Arrays;
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/**
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* Default {@link DnsOptEcsRecord} implementation.
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*/
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@UnstableApi
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public final class DefaultDnsOptEcsRecord extends AbstractDnsOptPseudoRrRecord implements DnsOptEcsRecord {
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private final int srcPrefixLength;
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private final byte[] address;
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/**
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* Creates a new instance.
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*
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* @param maxPayloadSize the suggested max payload size in bytes
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* @param extendedRcode the extended rcode
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* @param version the version
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* @param srcPrefixLength the prefix length
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* @param address the bytes of the {@link InetAddress} to use
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*/
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public DefaultDnsOptEcsRecord(int maxPayloadSize, int extendedRcode, int version,
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int srcPrefixLength, byte[] address) {
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super(maxPayloadSize, extendedRcode, version);
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this.srcPrefixLength = srcPrefixLength;
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this.address = verifyAddress(address).clone();
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}
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/**
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* Creates a new instance.
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*
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* @param maxPayloadSize the suggested max payload size in bytes
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* @param srcPrefixLength the prefix length
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* @param address the bytes of the {@link InetAddress} to use
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*/
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public DefaultDnsOptEcsRecord(int maxPayloadSize, int srcPrefixLength, byte[] address) {
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this(maxPayloadSize, 0, 0, srcPrefixLength, address);
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}
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/**
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* Creates a new instance.
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*
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* @param maxPayloadSize the suggested max payload size in bytes
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* @param protocolFamily the {@link InternetProtocolFamily} to use. This should be the same as the one used to
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* send the query.
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*/
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public DefaultDnsOptEcsRecord(int maxPayloadSize, InternetProtocolFamily protocolFamily) {
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this(maxPayloadSize, 0, 0, 0, protocolFamily.localhost().getAddress());
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}
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private static byte[] verifyAddress(byte[] bytes) {
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if (bytes.length == 4 || bytes.length == 16) {
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return bytes;
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}
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throw new IllegalArgumentException("bytes.length must either 4 or 16");
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}
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@Override
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public int sourcePrefixLength() {
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return srcPrefixLength;
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}
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@Override
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public int scopePrefixLength() {
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return 0;
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}
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@Override
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public byte[] address() {
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return address.clone();
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}
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@Override
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public String toString() {
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StringBuilder sb = toStringBuilder();
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sb.setLength(sb.length() - 1);
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return sb.append(" address:")
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.append(Arrays.toString(address))
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.append(" sourcePrefixLength:")
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.append(sourcePrefixLength())
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.append(" scopePrefixLength:")
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.append(scopePrefixLength())
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.append(')').toString();
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}
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}
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