SocksCmdResponse.java — netty Source File

Source Code

/*
 * 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:
 *
 *   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.socks;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.util.CharsetUtil;
import io.netty.util.NetUtil;
import io.netty.util.internal.ObjectUtil;

import java.net.IDN;

/**
 * A socks cmd response.
 *
 * @see SocksCmdRequest
 * @see SocksCmdResponseDecoder
 */
public final class SocksCmdResponse extends SocksResponse {
    private final SocksCmdStatus cmdStatus;

    private final SocksAddressType addressType;
    private final String host;
    private final int port;

    // All arrays are initialized on construction time to 0/false/null remove array Initialization
    private static final byte[] DOMAIN_ZEROED = {0x00};
    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) {
        this(cmdStatus, addressType, null, 0);
    }

    /**
     * Constructs new response and includes provided host and port as part of it.
     *
     * @param cmdStatus status of the response
     * @param addressType type of host parameter
     * @param host host (BND.ADDR field) is address that server used when connecting to the target host.
     *             When null a value of 4/8 0x00 octets will be used for IPv4/IPv6 and a single 0x00 byte will be
     *             used for domain addressType. Value is converted to ASCII using {@link IDN#toASCII(String)}.
     * @param port port (BND.PORT field) that the server assigned to connect to the target host
     * @throws NullPointerException in case cmdStatus or addressType are missing
// ... (115 more lines)