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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.coyote.ajp;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.net.Socket;
import java.util.concurrent.Executor;
import org.apache.coyote.ActionCode;
import org.apache.coyote.OutputBuffer;
import org.apache.coyote.Request;
import org.apache.coyote.RequestInfo;
import org.apache.coyote.Response;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.HexUtils;
import org.apache.tomcat.util.http.HttpMessages;
import org.apache.tomcat.util.net.AbstractEndpoint.Handler.SocketState;
import org.apache.tomcat.util.net.JIoEndpoint;
import org.apache.tomcat.util.net.SocketStatus;
import org.apache.tomcat.util.net.SocketWrapper;
/**
* Processes AJP requests.
*
* @author Remy Maucherat
* @author Henri Gomez
* @author Dan Milstein
* @author Keith Wannamaker
* @author Kevin Seguin
* @author Costin Manolache
* @author Bill Barker
*/
public class AjpProcessor extends AbstractAjpProcessor {
/**
* Logger.
*/
private static final Log log = LogFactory.getLog(AjpProcessor.class);
@Override
protected Log getLog() {
return log;
}
// ----------------------------------------------------------- Constructors
public AjpProcessor(int packetSize, JIoEndpoint endpoint) {
this.endpoint = endpoint;
request = new Request();
request.setInputBuffer(new SocketInputBuffer());
response = new Response();
response.setHook(this);
response.setOutputBuffer(new SocketOutputBuffer());
request.setResponse(response);
this.packetSize = packetSize;
requestHeaderMessage = new AjpMessage(packetSize);
responseHeaderMessage = new AjpMessage(packetSize);
bodyMessage = new AjpMessage(packetSize);
// Set the get body message buffer
AjpMessage getBodyMessage = new AjpMessage(16);
getBodyMessage.reset();
getBodyMessage.appendByte(Constants.JK_AJP13_GET_BODY_CHUNK);
// Adjust allowed size if packetSize != default (Constants.MAX_PACKET_SIZE)
getBodyMessage.appendInt(Constants.MAX_READ_SIZE + packetSize - Constants.MAX_PACKET_SIZE);
getBodyMessage.end();
getBodyMessageArray = new byte[getBodyMessage.getLen()];
System.arraycopy(getBodyMessage.getBuffer(), 0, getBodyMessageArray,
0, getBodyMessage.getLen());
// Cause loading of HexUtils
HexUtils.load();
// Cause loading of HttpMessages
HttpMessages.getMessage(200);
}
// ----------------------------------------------------- Instance Variables
/**
* Socket associated with the current connection.
*/
protected SocketWrapper socket;
/**
* Input stream.
*/
protected InputStream input;
/**
* Output stream.
*/
protected OutputStream output;
/**
* Direct buffer used for sending right away a get body message.
*/
protected final byte[] getBodyMessageArray;
/**
* Direct buffer used for sending right away a pong message.
*/
protected static final byte[] pongMessageArray;
/**
* End message array.
*/
protected static final byte[] endMessageArray;
/**
* Flush message array.
*/
protected static final byte[] flushMessageArray;
// ----------------------------------------------------- Static Initializer
static {
// Set the read body message buffer
AjpMessage pongMessage = new AjpMessage(16);
pongMessage.reset();
pongMessage.appendByte(Constants.JK_AJP13_CPONG_REPLY);
pongMessage.end();
pongMessageArray = new byte[pongMessage.getLen()];
System.arraycopy(pongMessage.getBuffer(), 0, pongMessageArray,
0, pongMessage.getLen());
// Allocate the end message array
AjpMessage endMessage = new AjpMessage(16);
endMessage.reset();
endMessage.appendByte(Constants.JK_AJP13_END_RESPONSE);
endMessage.appendByte(1);
endMessage.end();
endMessageArray = new byte[endMessage.getLen()];
System.arraycopy(endMessage.getBuffer(), 0, endMessageArray, 0,
endMessage.getLen());
// Allocate the flush message array
AjpMessage flushMessage = new AjpMessage(16);
flushMessage.reset();
flushMessage.appendByte(Constants.JK_AJP13_SEND_BODY_CHUNK);
flushMessage.appendInt(0);
flushMessage.appendByte(0);
flushMessage.end();
flushMessageArray = new byte[flushMessage.getLen()];
System.arraycopy(flushMessage.getBuffer(), 0, flushMessageArray, 0,
flushMessage.getLen());
}
// ------------------------------------------------------------- Properties
/**
* The number of milliseconds Tomcat will wait for a subsequent request
* before closing the connection. The default is the same as for
* Apache HTTP Server (15 000 milliseconds).
*/
protected int keepAliveTimeout = -1;
public int getKeepAliveTimeout() { return keepAliveTimeout; }
public void setKeepAliveTimeout(int timeout) { keepAliveTimeout = timeout; }
// --------------------------------------------------------- Public Methods
/**
* Process pipelined HTTP requests using the specified input and output
* streams.
*
* @throws IOException error during an I/O operation
*/
public SocketState process(SocketWrapper socket)
throws IOException {
RequestInfo rp = request.getRequestProcessor();
rp.setStage(org.apache.coyote.Constants.STAGE_PARSE);
// Setting up the socket
this.socket = socket;
input = socket.getSocket().getInputStream();
output = socket.getSocket().getOutputStream();
int soTimeout = -1;
if (keepAliveTimeout > 0) {
soTimeout = socket.getSocket().getSoTimeout();
}
// Error flag
error = false;
while (!error && !endpoint.isPaused()) {
// Parsing the request header
try {
// Set keep alive timeout if enabled
if (keepAliveTimeout > 0) {
socket.getSocket().setSoTimeout(keepAliveTimeout);
}
// Get first message of the request
if (!readMessage(requestHeaderMessage)) {
// This means a connection timeout
rp.setStage(org.apache.coyote.Constants.STAGE_ENDED);
break;
}
// Set back timeout if keep alive timeout is enabled
if (keepAliveTimeout > 0) {
socket.getSocket().setSoTimeout(soTimeout);
}
// Check message type, process right away and break if
// not regular request processing
int type = requestHeaderMessage.getByte();
if (type == Constants.JK_AJP13_CPING_REQUEST) {
try {
output.write(pongMessageArray);
} catch (IOException e) {
error = true;
}
continue;
} else if(type != Constants.JK_AJP13_FORWARD_REQUEST) {
// Usually the servlet didn't read the previous request body
if(log.isDebugEnabled()) {
log.debug("Unexpected message: "+type);
}
continue;
}
request.setStartTime(System.currentTimeMillis());
} catch (IOException e) {
error = true;
break;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.debug(sm.getString("ajpprocessor.header.error"), t);
// 400 - Bad Request
response.setStatus(400);
adapter.log(request, response, 0);
error = true;
}
// Setting up filters, and parse some request headers
rp.setStage(org.apache.coyote.Constants.STAGE_PREPARE);
try {
prepareRequest();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.debug(sm.getString("ajpprocessor.request.prepare"), t);
// 400 - Internal Server Error
response.setStatus(400);
adapter.log(request, response, 0);
error = true;
}
// Process the request in the adapter
if (!error) {
try {
rp.setStage(org.apache.coyote.Constants.STAGE_SERVICE);
adapter.service(request, response);
} catch (InterruptedIOException e) {
error = true;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("ajpprocessor.request.process"), t);
// 500 - Internal Server Error
response.setStatus(500);
adapter.log(request, response, 0);
error = true;
}
}
if (isAsync() && !error) {
break;
}
// Finish the response if not done yet
if (!finished) {
try {
finish();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
error = true;
}
}
// If there was an error, make sure the request is counted as
// and error, and update the statistics counter
if (error) {
response.setStatus(500);
}
request.updateCounters();
rp.setStage(org.apache.coyote.Constants.STAGE_KEEPALIVE);
recycle();
}
rp.setStage(org.apache.coyote.Constants.STAGE_ENDED);
if (isAsync() && !error && !endpoint.isPaused()) {
return SocketState.LONG;
} else {
recycle();
input = null;
output = null;
return SocketState.CLOSED;
}
}
public SocketState asyncDispatch(SocketStatus status) {
RequestInfo rp = request.getRequestProcessor();
try {
rp.setStage(org.apache.coyote.Constants.STAGE_SERVICE);
error = !adapter.asyncDispatch(request, response, status);
} catch (InterruptedIOException e) {
error = true;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("http11processor.request.process"), t);
// 500 - Internal Server Error
response.setStatus(500);
adapter.log(request, response, 0);
error = true;
}
rp.setStage(org.apache.coyote.Constants.STAGE_ENDED);
if (isAsync()) {
if (error) {
response.setStatus(500);
request.updateCounters();
recycle();
input = null;
output = null;
return SocketState.CLOSED;
} else {
return SocketState.LONG;
}
} else {
if (error) {
response.setStatus(500);
}
request.updateCounters();
recycle();
input = null;
output = null;
return SocketState.CLOSED;
}
}
@Override
public Executor getExecutor() {
return endpoint.getExecutor();
}
// ----------------------------------------------------- ActionHook Methods
/**
* Send an action to the connector.
*
* @param actionCode Type of the action
* @param param Action parameter
*/
@Override
protected void actionInternal(ActionCode actionCode, Object param) {
if (actionCode == ActionCode.ASYNC_COMPLETE) {
if (asyncStateMachine.asyncComplete()) {
((JIoEndpoint)endpoint).processSocketAsync(this.socket,
SocketStatus.OPEN);
}
} else if (actionCode == ActionCode.ASYNC_SETTIMEOUT) {
if (param == null) return;
long timeout = ((Long)param).longValue();
// if we are not piggy backing on a worker thread, set the timeout
socket.setTimeout(timeout);
} else if (actionCode == ActionCode.ASYNC_DISPATCH) {
if (asyncStateMachine.asyncDispatch()) {
((JIoEndpoint)endpoint).processSocketAsync(this.socket,
SocketStatus.OPEN);
}
}
}
// ------------------------------------------------------ Protected Methods
@Override
protected void output(byte[] src, int offset, int length)
throws IOException {
output.write(src, offset, length);
}
/**
* Finish AJP response.
*/
@Override
protected void finish() throws IOException {
if (!response.isCommitted()) {
// Validate and write response headers
try {
prepareResponse();
} catch (IOException e) {
// Set error flag
error = true;
}
}
if (finished)
return;
finished = true;
// Add the end message
output.write(endMessageArray);
}
/**
* Read at least the specified amount of bytes, and place them
* in the input buffer.
*/
protected boolean read(byte[] buf, int pos, int n)
throws IOException {
int read = 0;
int res = 0;
while (read < n) {
res = input.read(buf, read + pos, n - read);
if (res > 0) {
read += res;
} else {
throw new IOException(sm.getString("ajpprotocol.failedread"));
}
}
return true;
}
/** Receive a chunk of data. Called to implement the
* 'special' packet in ajp13 and to receive the data
* after we send a GET_BODY packet
*/
@Override
public boolean receive() throws IOException {
first = false;
bodyMessage.reset();
if (!readMessage(bodyMessage)) {
// Invalid message
return false;
}
// No data received.
if (bodyMessage.getLen() == 0) {
// just the header
// Don't mark 'end of stream' for the first chunk.
return false;
}
int blen = bodyMessage.peekInt();
if (blen == 0) {
return false;
}
bodyMessage.getBytes(bodyBytes);
empty = false;
return true;
}
/**
* Get more request body data from the web server and store it in the
* internal buffer.
*
* @return true if there is more data, false if not.
*/
@Override
protected boolean refillReadBuffer() throws IOException {
// If the server returns an empty packet, assume that that end of
// the stream has been reached (yuck -- fix protocol??).
// FORM support
if (replay) {
endOfStream = true; // we've read everything there is
}
if (endOfStream) {
return false;
}
// Request more data immediately
output.write(getBodyMessageArray);
boolean moreData = receive();
if( !moreData ) {
endOfStream = true;
}
return moreData;
}
/**
* Read an AJP message.
*
* @return true if the message has been read, false if the short read
* didn't return anything
* @throws IOException any other failure, including incomplete reads
*/
protected boolean readMessage(AjpMessage message)
throws IOException {
byte[] buf = message.getBuffer();
int headerLength = message.getHeaderLength();
read(buf, 0, headerLength);
int messageLength = message.processHeader();
if (messageLength < 0) {
// Invalid AJP header signature
// TODO: Throw some exception and close the connection to frontend.
return false;
}
else if (messageLength == 0) {
// Zero length message.
return true;
}
else {
read(buf, headerLength, messageLength);
return true;
}
}
/**
* Callback to write data from the buffer.
*/
@Override
protected void flush(boolean explicit) throws IOException {
if (explicit && !finished) {
// Send the flush message
output.write(flushMessageArray);
}
}
// ----------------------------------- OutputStreamOutputBuffer Inner Class
/**
* This class is an output buffer which will write data to an output
* stream.
*/
protected class SocketOutputBuffer implements OutputBuffer {
/**
* Write chunk.
*/
@Override
public int doWrite(ByteChunk chunk, Response res)
throws IOException {
if (!response.isCommitted()) {
// Validate and write response headers
try {
prepareResponse();
} catch (IOException e) {
// Set error flag
error = true;
}
}
int len = chunk.getLength();
// 4 - hardcoded, byte[] marshaling overhead
// Adjust allowed size if packetSize != default (Constants.MAX_PACKET_SIZE)
int chunkSize = Constants.MAX_SEND_SIZE + packetSize - Constants.MAX_PACKET_SIZE;
int off = 0;
while (len > 0) {
int thisTime = len;
if (thisTime > chunkSize) {
thisTime = chunkSize;
}
len -= thisTime;
responseHeaderMessage.reset();
responseHeaderMessage.appendByte(Constants.JK_AJP13_SEND_BODY_CHUNK);
responseHeaderMessage.appendBytes(chunk.getBytes(), chunk.getOffset() + off, thisTime);
responseHeaderMessage.end();
output.write(responseHeaderMessage.getBuffer(), 0, responseHeaderMessage.getLen());
off += thisTime;
}
byteCount += chunk.getLength();
return chunk.getLength();
}
@Override
public long getBytesWritten() {
return byteCount;
}
}
}
