io.netty.handler.codec.socks.SocksCmdResponse Maven / Gradle / Ivy
/*
* Copyright 2012 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:
*
* http://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.socks;
import io.netty.buffer.ByteBuf;
/**
* An socks cmd response.
*
* @see SocksCmdRequest
* @see SocksCmdResponseDecoder
*/
public final class SocksCmdResponse extends SocksResponse {
private final SocksCmdStatus cmdStatus;
private final SocksAddressType addressType;
// All arrays are initialized on construction time to 0/false/null remove array Initialization
private static final byte[] IPv4_HOSTNAME_ZEROED = {0x00, 0x00, 0x00, 0x00};
private static final byte[] IPv6_HOSTNAME_ZEROED = {0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00};
public SocksCmdResponse(SocksCmdStatus cmdStatus, SocksAddressType addressType) {
super(SocksResponseType.CMD);
if (cmdStatus == null) {
throw new NullPointerException("cmdStatus");
}
if (addressType == null) {
throw new NullPointerException("addressType");
}
this.cmdStatus = cmdStatus;
this.addressType = addressType;
}
/**
* Returns the {@link SocksCmdStatus} of this {@link SocksCmdResponse}
*
* @return The {@link SocksCmdStatus} of this {@link SocksCmdResponse}
*/
public SocksCmdStatus cmdStatus() {
return cmdStatus;
}
/**
* Returns the {@link SocksAddressType} of this {@link SocksCmdResponse}
*
* @return The {@link SocksAddressType} of this {@link SocksCmdResponse}
*/
public SocksAddressType addressType() {
return addressType;
}
@Override
public void encodeAsByteBuf(ByteBuf byteBuf) {
byteBuf.writeByte(protocolVersion().byteValue());
byteBuf.writeByte(cmdStatus.byteValue());
byteBuf.writeByte(0x00);
byteBuf.writeByte(addressType.byteValue());
switch (addressType) {
case IPv4: {
byteBuf.writeBytes(IPv4_HOSTNAME_ZEROED);
byteBuf.writeShort(0);
break;
}
case DOMAIN: {
byteBuf.writeByte(1); // domain length
byteBuf.writeByte(0); // domain value
byteBuf.writeShort(0); // port value
break;
}
case IPv6: {
byteBuf.writeBytes(IPv6_HOSTNAME_ZEROED);
byteBuf.writeShort(0);
break;
}
}
}
}