io.netty.handler.codec.socksx.v5.Socks5ClientEncoder 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;
import java.util.List;
import java.util.RandomAccess;
/**
* Encodes a client-side {@link Socks5Message} into a {@link ByteBuf}.
*/
@Sharable
public class Socks5ClientEncoder extends MessageToByteEncoder {
public static final Socks5ClientEncoder DEFAULT = new Socks5ClientEncoder();
private final Socks5AddressEncoder addressEncoder;
/**
* Creates a new instance with the default {@link Socks5AddressEncoder}.
*/
protected Socks5ClientEncoder() {
this(Socks5AddressEncoder.DEFAULT);
}
/**
* Creates a new instance with the specified {@link Socks5AddressEncoder}.
*/
public Socks5ClientEncoder(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 Socks5InitialRequest) {
encodeAuthMethodRequest((Socks5InitialRequest) msg, out);
} else if (msg instanceof Socks5PasswordAuthRequest) {
encodePasswordAuthRequest((Socks5PasswordAuthRequest) msg, out);
} else if (msg instanceof Socks5CommandRequest) {
encodeCommandRequest((Socks5CommandRequest) msg, out);
} else {
throw new EncoderException("unsupported message type: " + StringUtil.simpleClassName(msg));
}
}
private static void encodeAuthMethodRequest(Socks5InitialRequest msg, ByteBuf out) {
out.writeByte(msg.version().byteValue());
final List authMethods = msg.authMethods();
final int numAuthMethods = authMethods.size();
out.writeByte(numAuthMethods);
if (authMethods instanceof RandomAccess) {
for (int i = 0; i < numAuthMethods; i ++) {
out.writeByte(authMethods.get(i).byteValue());
}
} else {
for (Socks5AuthMethod a: authMethods) {
out.writeByte(a.byteValue());
}
}
}
private static void encodePasswordAuthRequest(Socks5PasswordAuthRequest msg, ByteBuf out) {
out.writeByte(0x01);
final String username = msg.username();
out.writeByte(username.length());
ByteBufUtil.writeAscii(out, username);
final String password = msg.password();
out.writeByte(password.length());
ByteBufUtil.writeAscii(out, password);
}
private void encodeCommandRequest(Socks5CommandRequest msg, ByteBuf out) throws Exception {
out.writeByte(msg.version().byteValue());
out.writeByte(msg.type().byteValue());
out.writeByte(0x00);
final Socks5AddressType dstAddrType = msg.dstAddrType();
out.writeByte(dstAddrType.byteValue());
addressEncoder.encodeAddress(dstAddrType, msg.dstAddr(), out);
out.writeShort(msg.dstPort());
}
}
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