/
SocksCmdRequest.java
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/
SocksCmdRequest.java
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/*
* 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;
import io.netty.util.CharsetUtil;
import io.netty.util.NetUtil;
import java.net.IDN;
/**
* An socks cmd request.
*
* @see SocksCmdResponse
* @see SocksCmdRequestDecoder
*/
public final class SocksCmdRequest extends SocksRequest {
private final CmdType cmdType;
private final AddressType addressType;
private final String host;
private final int port;
public SocksCmdRequest(CmdType cmdType, AddressType addressType, String host, int port) {
super(SocksRequestType.CMD);
if (cmdType == null) {
throw new NullPointerException("cmdType");
}
if (addressType == null) {
throw new NullPointerException("addressType");
}
if (host == null) {
throw new NullPointerException("host");
}
switch (addressType) {
case IPv4:
if (!NetUtil.isValidIpV4Address(host)) {
throw new IllegalArgumentException(host + " is not a valid IPv4 address");
}
break;
case DOMAIN:
if (IDN.toASCII(host).length() > 255) {
throw new IllegalArgumentException(host + " IDN: " + IDN.toASCII(host) + " exceeds 255 char limit");
}
break;
case IPv6:
if (!NetUtil.isValidIp6Address(host)) {
throw new IllegalArgumentException(host + " is not a valid IPv6 address");
}
break;
case UNKNOWN:
break;
}
if (port < 0 && port >= 65535) {
throw new IllegalArgumentException(port + " is not in bounds 0 < x < 65536");
}
this.cmdType = cmdType;
this.addressType = addressType;
this.host = IDN.toASCII(host);
this.port = port;
}
/**
* Returns the {@link CmdType} of this {@link SocksCmdRequest}
*
* @return The {@link CmdType} of this {@link SocksCmdRequest}
*/
public CmdType getCmdType() {
return cmdType;
}
/**
* Returns the {@link AddressType} of this {@link SocksCmdRequest}
*
* @return The {@link AddressType} of this {@link SocksCmdRequest}
*/
public AddressType getAddressType() {
return addressType;
}
/**
* Returns host that is used as a parameter in {@link CmdType}
*
* @return host that is used as a parameter in {@link CmdType}
*/
public String getHost() {
return IDN.toUnicode(host);
}
/**
* Returns port that is used as a parameter in {@link CmdType}
*
* @return port that is used as a parameter in {@link CmdType}
*/
public int getPort() {
return port;
}
@Override
public void encodeAsByteBuf(ByteBuf byteBuf) {
byteBuf.writeByte(getProtocolVersion().getByteValue());
byteBuf.writeByte(cmdType.getByteValue());
byteBuf.writeByte(0x00);
byteBuf.writeByte(addressType.getByteValue());
switch (addressType) {
case IPv4: {
byteBuf.writeBytes(NetUtil.createByteArrayFromIpAddressString(host));
byteBuf.writeShort(port);
break;
}
case DOMAIN: {
byteBuf.writeByte(host.length());
byteBuf.writeBytes(host.getBytes(CharsetUtil.US_ASCII));
byteBuf.writeShort(port);
break;
}
case IPv6: {
byteBuf.writeBytes(NetUtil.createByteArrayFromIpAddressString(host));
byteBuf.writeShort(port);
break;
}
}
}
}