io.netty.handler.codec.socksx.v5.Socks5AddressEncoder 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).

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/*
 * Copyright 2015 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.handler.codec.EncoderException;
import io.netty.util.CharsetUtil;
import io.netty.util.NetUtil;

/**
 * Encodes a SOCKS5 address into binary representation.
 *
 * @see Socks5ClientEncoder
 * @see Socks5ServerEncoder
 */
public interface Socks5AddressEncoder {

    Socks5AddressEncoder DEFAULT = new Socks5AddressEncoder() {
        @Override
        public void encodeAddress(Socks5AddressType addrType, String addrValue, ByteBuf out) throws Exception {
            final byte typeVal = addrType.byteValue();
            if (typeVal == Socks5AddressType.IPv4.byteValue()) {
                if (addrValue != null) {
                    out.writeBytes(NetUtil.createByteArrayFromIpAddressString(addrValue));
                } else {
                    out.writeInt(0);
                }
            } else if (typeVal == Socks5AddressType.DOMAIN.byteValue()) {
                if (addrValue != null) {
                    out.writeByte(addrValue.length());
                    out.writeCharSequence(addrValue, CharsetUtil.US_ASCII);
                } else {
                    out.writeByte(0);
                }
            } else if (typeVal == Socks5AddressType.IPv6.byteValue()) {
                if (addrValue != null) {
                    out.writeBytes(NetUtil.createByteArrayFromIpAddressString(addrValue));
                } else {
                    out.writeLong(0);
                    out.writeLong(0);
                }
            } else {
                throw new EncoderException("unsupported addrType: " + (addrType.byteValue() & 0xFF));
            }
        }
    };

    /**
     * Encodes a SOCKS5 address.
     *
     * @param addrType the type of the address
     * @param addrValue the string representation of the address
     * @param out the output buffer where the encoded SOCKS5 address field will be written to
     */
    void encodeAddress(Socks5AddressType addrType, String addrValue, ByteBuf out) throws Exception;
}