/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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 org.elasticsearch.transport.netty;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.monitor.jvm.JvmInfo;
import org.elasticsearch.rest.RestStatus;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.frame.FrameDecoder;
import org.jboss.netty.handler.codec.frame.TooLongFrameException;
import java.io.IOException;
import java.io.StreamCorruptedException;
/**
*/
public class SizeHeaderFrameDecoder extends FrameDecoder {
private static final long NINETY_PER_HEAP_SIZE = (long) (JvmInfo.jvmInfo().getMem().getHeapMax().bytes() * 0.9);
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {
final int sizeHeaderLength = NettyHeader.MARKER_BYTES_SIZE + NettyHeader.MESSAGE_LENGTH_SIZE;
if (buffer.readableBytes() < sizeHeaderLength) {
return null;
}
int readerIndex = buffer.readerIndex();
if (buffer.getByte(readerIndex) != 'E' || buffer.getByte(readerIndex + 1) != 'S') {
// special handling for what is probably HTTP
if (bufferStartsWith(buffer, readerIndex, "GET ") ||
bufferStartsWith(buffer, readerIndex, "POST ") ||
bufferStartsWith(buffer, readerIndex, "PUT ") ||
bufferStartsWith(buffer, readerIndex, "HEAD ") ||
bufferStartsWith(buffer, readerIndex, "DELETE ") ||
bufferStartsWith(buffer, readerIndex, "OPTIONS ") ||
bufferStartsWith(buffer, readerIndex, "PATCH ") ||
bufferStartsWith(buffer, readerIndex, "TRACE ")) {
throw new HttpOnTransportException("This is not a HTTP port");
}
// we have 6 readable bytes, show 4 (should be enough)
throw new StreamCorruptedException("invalid internal transport message format, got ("
+ Integer.toHexString(buffer.getByte(readerIndex) & 0xFF) + ","
+ Integer.toHexString(buffer.getByte(readerIndex + 1) & 0xFF) + ","
+ Integer.toHexString(buffer.getByte(readerIndex + 2) & 0xFF) + ","
+ Integer.toHexString(buffer.getByte(readerIndex + 3) & 0xFF) + ")");
}
int dataLen = buffer.getInt(buffer.readerIndex() + NettyHeader.MARKER_BYTES_SIZE);
if (dataLen == NettyHeader.PING_DATA_SIZE) {
// discard the messages we read and continue, this is achieved by skipping the bytes
// and returning null
buffer.skipBytes(sizeHeaderLength);
return null;
}
if (dataLen <= 0) {
throw new StreamCorruptedException("invalid data length: " + dataLen);
}
// safety against too large frames being sent
if (dataLen > NINETY_PER_HEAP_SIZE) {
throw new TooLongFrameException(
"transport content length received [" + new ByteSizeValue(dataLen) + "] exceeded [" + new ByteSizeValue(NINETY_PER_HEAP_SIZE) + "]");
}
if (buffer.readableBytes() < dataLen + sizeHeaderLength) {
return null;
}
buffer.skipBytes(sizeHeaderLength);
return buffer;
}
private boolean bufferStartsWith(ChannelBuffer buffer, int readerIndex, String method) {
char[] chars = method.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (buffer.getByte(readerIndex + i) != chars[i]) {
return false;
}
}
return true;
}
/**
* A helper exception to mark an incoming connection as potentially being HTTP
* so an appropriate error code can be returned
*/
public static class HttpOnTransportException extends ElasticsearchException {
public HttpOnTransportException(String msg) {
super(msg);
}
@Override
public RestStatus status() {
return RestStatus.BAD_REQUEST;
}
public HttpOnTransportException(StreamInput in) throws IOException{
super(in);
}
}
}