io.netty.handler.codec.socksx.v5.Socks5ServerEncoder Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright 2014 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.socksx.v5;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.EncoderException;
import io.netty.handler.codec.MessageToByteEncoder;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.StringUtil;
/**
* Encodes a server-side {@link Socks5Message} into a {@link ByteBuf}.
*/
@Sharable
public class Socks5ServerEncoder extends MessageToByteEncoder {
public static final Socks5ServerEncoder DEFAULT = new Socks5ServerEncoder(Socks5AddressEncoder.DEFAULT);
private final Socks5AddressEncoder addressEncoder;
/**
* Creates a new instance with the default {@link Socks5AddressEncoder}.
*/
protected Socks5ServerEncoder() {
this(Socks5AddressEncoder.DEFAULT);
}
/**
* Creates a new instance with the specified {@link Socks5AddressEncoder}.
*/
public Socks5ServerEncoder(Socks5AddressEncoder addressEncoder) {
this.addressEncoder = ObjectUtil.checkNotNull(addressEncoder, "addressEncoder");
}
/**
* Returns the {@link Socks5AddressEncoder} of this encoder.
*/
protected final Socks5AddressEncoder addressEncoder() {
return addressEncoder;
}
@Override
protected void encode(ChannelHandlerContext ctx, Socks5Message msg, ByteBuf out) throws Exception {
if (msg instanceof Socks5InitialResponse) {
encodeAuthMethodResponse((Socks5InitialResponse) msg, out);
} else if (msg instanceof Socks5PasswordAuthResponse) {
encodePasswordAuthResponse((Socks5PasswordAuthResponse) msg, out);
} else if (msg instanceof Socks5CommandResponse) {
encodeCommandResponse((Socks5CommandResponse) msg, out);
} else {
throw new EncoderException("unsupported message type: " + StringUtil.simpleClassName(msg));
}
}
private static void encodeAuthMethodResponse(Socks5InitialResponse msg, ByteBuf out) {
out.writeByte(msg.version().byteValue());
out.writeByte(msg.authMethod().byteValue());
}
private static void encodePasswordAuthResponse(Socks5PasswordAuthResponse msg, ByteBuf out) {
out.writeByte(0x01);
out.writeByte(msg.status().byteValue());
}
private void encodeCommandResponse(Socks5CommandResponse msg, ByteBuf out) throws Exception {
out.writeByte(msg.version().byteValue());
out.writeByte(msg.status().byteValue());
out.writeByte(0x00);
final Socks5AddressType bndAddrType = msg.bndAddrType();
out.writeByte(bndAddrType.byteValue());
addressEncoder.encodeAddress(bndAddrType, msg.bndAddr(), out);
ByteBufUtil.writeShortBE(out, msg.bndPort());
}
}