io.netty.handler.codec.socksx.v5.Socks5ServerEncoder Maven / Gradle / Ivy
/*
* 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());
}
}