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Add TcpDnsQueryDecoder and TcpDnsResponseEncoder (netty#11415)
Motivation: There is no decoder and encoder for TCP based DNS. Result: - Added decoder and encoder - Added tests - Added example Result: Be able to decode and encode TCP based dns Co-authored-by: Norman Maurer <norman_maurer@apple.com>
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55 changes: 55 additions & 0 deletions
55
codec-dns/src/main/java/io/netty/handler/codec/dns/TcpDnsQueryDecoder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* | ||
| * Copyright 2021 The Netty Project | ||
| * | ||
| * The Netty Project licenses this file to you under the Apache License, | ||
| * version 2.0 (the "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at: | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package io.netty.handler.codec.dns; | ||
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| import io.netty.buffer.ByteBuf; | ||
| import io.netty.channel.ChannelHandlerContext; | ||
| import io.netty.handler.codec.LengthFieldBasedFrameDecoder; | ||
| import io.netty.util.internal.ObjectUtil; | ||
|
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| public final class TcpDnsQueryDecoder extends LengthFieldBasedFrameDecoder { | ||
| private final DnsRecordDecoder decoder; | ||
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| /** | ||
| * Creates a new decoder with {@linkplain DnsRecordDecoder#DEFAULT the default record decoder}. | ||
| */ | ||
| public TcpDnsQueryDecoder() { | ||
| this(DnsRecordDecoder.DEFAULT, 65535); | ||
| } | ||
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| /** | ||
| * Creates a new decoder with the specified {@code decoder}. | ||
| */ | ||
| public TcpDnsQueryDecoder(DnsRecordDecoder decoder, int maxFrameLength) { | ||
| super(maxFrameLength, 0, 2, 0, 2); | ||
| this.decoder = ObjectUtil.checkNotNull(decoder, "decoder"); | ||
| } | ||
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| @Override | ||
| protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception { | ||
| ByteBuf frame = (ByteBuf) super.decode(ctx, in); | ||
| if (frame == null) { | ||
| return null; | ||
| } | ||
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| return DnsMessageUtil.decodeDnsQuery(decoder, frame.slice(), new DnsMessageUtil.DnsQueryFactory() { | ||
| @Override | ||
| public DnsQuery newQuery(int id, DnsOpCode dnsOpCode) { | ||
| return new DefaultDnsQuery(id, dnsOpCode); | ||
| } | ||
| }); | ||
| } | ||
| } |
54 changes: 54 additions & 0 deletions
54
codec-dns/src/main/java/io/netty/handler/codec/dns/TcpDnsResponseEncoder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /* | ||
| * Copyright 2021 The Netty Project | ||
| * | ||
| * The Netty Project licenses this file to you under the Apache License, | ||
| * version 2.0 (the "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at: | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package io.netty.handler.codec.dns; | ||
|
|
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| import io.netty.buffer.ByteBuf; | ||
| import io.netty.channel.ChannelHandler; | ||
| import io.netty.channel.ChannelHandlerContext; | ||
| import io.netty.handler.codec.MessageToMessageEncoder; | ||
| import io.netty.util.internal.ObjectUtil; | ||
|
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| import java.util.List; | ||
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| @ChannelHandler.Sharable | ||
| public final class TcpDnsResponseEncoder extends MessageToMessageEncoder<DnsResponse> { | ||
| private final DnsRecordEncoder encoder; | ||
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| /** | ||
| * Creates a new encoder with {@linkplain DnsRecordEncoder#DEFAULT the default record encoder}. | ||
| */ | ||
| public TcpDnsResponseEncoder() { | ||
| this(DnsRecordEncoder.DEFAULT); | ||
| } | ||
|
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| /** | ||
| * Creates a new encoder with the specified {@code encoder}. | ||
| */ | ||
| public TcpDnsResponseEncoder(DnsRecordEncoder encoder) { | ||
| this.encoder = ObjectUtil.checkNotNull(encoder, "encoder"); | ||
| } | ||
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| @Override | ||
| protected void encode(ChannelHandlerContext ctx, DnsResponse response, List<Object> out) throws Exception { | ||
| ByteBuf buf = ctx.alloc().ioBuffer(1024); | ||
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| buf.writerIndex(buf.writerIndex() + 2); | ||
| DnsMessageUtil.encodeDnsResponse(encoder, response, buf); | ||
| buf.setShort(0, buf.readableBytes() - 2); | ||
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| out.add(buf); | ||
| } | ||
| } |
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