/*
* 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.example.portunification;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundByteHandlerAdapter;
import io.netty.channel.ChannelPipeline;
import io.netty.example.factorial.BigIntegerDecoder;
import io.netty.example.factorial.FactorialServerHandler;
import io.netty.example.factorial.NumberEncoder;
import io.netty.example.http.snoop.HttpSnoopServerHandler;
import io.netty.example.securechat.SecureChatSslContextFactory;
import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.compression.ZlibWrapper;
import io.netty.handler.codec.http.HttpContentCompressor;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.ssl.SslHandler;
import javax.net.ssl.SSLEngine;
/**
* Manipulates the current pipeline dynamically to switch protocols or enable
* SSL or GZIP.
*/
public class PortUnificationServerHandler extends ChannelInboundByteHandlerAdapter {
private final boolean detectSsl;
private final boolean detectGzip;
public PortUnificationServerHandler() {
this(true, true);
}
private PortUnificationServerHandler(boolean detectSsl, boolean detectGzip) {
this.detectSsl = detectSsl;
this.detectGzip = detectGzip;
}
@Override
public void inboundBufferUpdated(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
// Will use the first five bytes to detect a protocol.
if (in.readableBytes() < 5) {
return;
}
if (isSsl(in)) {
enableSsl(ctx);
} else {
final int magic1 = in.getUnsignedByte(in.readerIndex());
final int magic2 = in.getUnsignedByte(in.readerIndex() + 1);
if (isGzip(magic1, magic2)) {
enableGzip(ctx);
} else if (isHttp(magic1, magic2)) {
switchToHttp(ctx);
} else if (isFactorial(magic1)) {
switchToFactorial(ctx);
} else {
// Unknown protocol; discard everything and close the connection.
in.clear();
ctx.close();
}
}
}
private boolean isSsl(ByteBuf buf) {
if (detectSsl) {
return SslHandler.isEncrypted(buf);
}
return false;
}
private boolean isGzip(int magic1, int magic2) {
if (detectGzip) {
return magic1 == 31 && magic2 == 139;
}
return false;
}
private static boolean isHttp(int magic1, int magic2) {
return
magic1 == 'G' && magic2 == 'E' || // GET
magic1 == 'P' && magic2 == 'O' || // POST
magic1 == 'P' && magic2 == 'U' || // PUT
magic1 == 'H' && magic2 == 'E' || // HEAD
magic1 == 'O' && magic2 == 'P' || // OPTIONS
magic1 == 'P' && magic2 == 'A' || // PATCH
magic1 == 'D' && magic2 == 'E' || // DELETE
magic1 == 'T' && magic2 == 'R' || // TRACE
magic1 == 'C' && magic2 == 'O'; // CONNECT
}
private static boolean isFactorial(int magic1) {
return magic1 == 'F';
}
private void enableSsl(ChannelHandlerContext ctx) {
ChannelPipeline p = ctx.pipeline();
SSLEngine engine =
SecureChatSslContextFactory.getServerContext().createSSLEngine();
engine.setUseClientMode(false);
p.addLast("ssl", new SslHandler(engine));
p.addLast("unificationA", new PortUnificationServerHandler(false, detectGzip));
p.removeAndForward(this);
}
private void enableGzip(ChannelHandlerContext ctx) {
ChannelPipeline p = ctx.pipeline();
p.addLast("gzipdeflater", ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
p.addLast("gzipinflater", ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
p.addLast("unificationB", new PortUnificationServerHandler(detectSsl, false));
p.removeAndForward(this);
}
private void switchToHttp(ChannelHandlerContext ctx) {
ChannelPipeline p = ctx.pipeline();
p.addLast("decoder", new HttpRequestDecoder());
p.addLast("encoder", new HttpResponseEncoder());
p.addLast("deflater", new HttpContentCompressor());
p.addLast("handler", new HttpSnoopServerHandler());
p.removeAndForward(this);
}
private void switchToFactorial(ChannelHandlerContext ctx) {
ChannelPipeline p = ctx.pipeline();
p.addLast("decoder", new BigIntegerDecoder());
p.addLast("encoder", new NumberEncoder());
p.addLast("handler", new FactorialServerHandler());
p.removeAndForward(this);
}
}