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.
79 lines
2.6 KiB
Java
79 lines
2.6 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.util.internal.StringUtil;
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import io.netty.util.internal.UnstableApi;
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/**
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* An <a href="https://tools.ietf.org/html/rfc6891#section-6.1">OPT RR</a> record.
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*
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* This is used for <a href="https://tools.ietf.org/html/rfc6891#section-6.1.3">
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* Extension Mechanisms for DNS (EDNS(0))</a>.
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*/
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@UnstableApi
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public abstract class AbstractDnsOptPseudoRrRecord extends AbstractDnsRecord implements DnsOptPseudoRecord {
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protected AbstractDnsOptPseudoRrRecord(int maxPayloadSize, int extendedRcode, int version) {
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super(StringUtil.EMPTY_STRING, DnsRecordType.OPT, maxPayloadSize, packIntoLong(extendedRcode, version));
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}
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protected AbstractDnsOptPseudoRrRecord(int maxPayloadSize) {
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super(StringUtil.EMPTY_STRING, DnsRecordType.OPT, maxPayloadSize, 0);
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}
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// See https://tools.ietf.org/html/rfc6891#section-6.1.3
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private static long packIntoLong(int val, int val2) {
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// We are currently not support DO and Z fields, just use 0.
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return ((val & 0xff) << 24 | (val2 & 0xff) << 16 | (0 & 0xff) << 8 | 0 & 0xff) & 0xFFFFFFFFL;
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}
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@Override
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public int extendedRcode() {
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return (short) (((int) timeToLive() >> 24) & 0xff);
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}
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@Override
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public int version() {
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return (short) (((int) timeToLive() >> 16) & 0xff);
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}
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@Override
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public int flags() {
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return (short) ((short) timeToLive() & 0xff);
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}
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@Override
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public String toString() {
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return toStringBuilder().toString();
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}
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final StringBuilder toStringBuilder() {
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return new StringBuilder(64)
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.append(StringUtil.simpleClassName(this))
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.append('(')
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.append("OPT flags:")
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.append(flags())
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.append(" version:")
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.append(version())
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.append(" extendedRecode:")
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.append(extendedRcode())
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.append(" udp:")
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.append(dnsClass())
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.append(')');
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}
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}
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