http11processor.java

业界著名的tomcat服务器的最新6.0的源代码。

/*
 *  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.http11;

import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.InetAddress;
import java.net.Socket;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.StringTokenizer;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.apache.coyote.ActionCode;
import org.apache.coyote.ActionHook;
import org.apache.coyote.Adapter;
import org.apache.coyote.Request;
import org.apache.coyote.RequestInfo;
import org.apache.coyote.Response;
import org.apache.coyote.http11.filters.BufferedInputFilter;
import org.apache.coyote.http11.filters.ChunkedInputFilter;
import org.apache.coyote.http11.filters.ChunkedOutputFilter;
import org.apache.coyote.http11.filters.GzipOutputFilter;
import org.apache.coyote.http11.filters.IdentityInputFilter;
import org.apache.coyote.http11.filters.IdentityOutputFilter;
import org.apache.coyote.http11.filters.SavedRequestInputFilter;
import org.apache.coyote.http11.filters.VoidInputFilter;
import org.apache.coyote.http11.filters.VoidOutputFilter;
import org.apache.tomcat.util.buf.Ascii;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.HexUtils;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.http.FastHttpDateFormat;
import org.apache.tomcat.util.http.MimeHeaders;
import org.apache.tomcat.util.net.JIoEndpoint;
import org.apache.tomcat.util.net.SSLSupport;
import org.apache.tomcat.util.res.StringManager;


/**
 * Processes HTTP requests.
 *
 * @author Remy Maucherat
 */
public class Http11Processor implements ActionHook {


    /**
     * Logger.
     */
    protected static org.apache.juli.logging.Log log
        = org.apache.juli.logging.LogFactory.getLog(Http11Processor.class);

    /**
     * The string manager for this package.
     */
    protected static StringManager sm =
        StringManager.getManager(Constants.Package);


    // ------------------------------------------------------------ Constructor


    public Http11Processor(int headerBufferSize, JIoEndpoint endpoint) {

        this.endpoint = endpoint;
        
        request = new Request();
        inputBuffer = new InternalInputBuffer(request, headerBufferSize);
        request.setInputBuffer(inputBuffer);

        response = new Response();
        response.setHook(this);
        outputBuffer = new InternalOutputBuffer(response, headerBufferSize);
        response.setOutputBuffer(outputBuffer);
        request.setResponse(response);

        initializeFilters();

        // Cause loading of HexUtils
        int foo = HexUtils.DEC[0];

    }


    // ----------------------------------------------------- Instance Variables


    /**
     * Associated adapter.
     */
    protected Adapter adapter = null;


    /**
     * Request object.
     */
    protected Request request = null;


    /**
     * Response object.
     */
    protected Response response = null;


    /**
     * Input.
     */
    protected InternalInputBuffer inputBuffer = null;


    /**
     * Output.
     */
    protected InternalOutputBuffer outputBuffer = null;


    /**
     * State flag.
     */
    protected boolean started = false;


    /**
     * Error flag.
     */
    protected boolean error = false;


    /**
     * Keep-alive.
     */
    protected boolean keepAlive = true;


    /**
     * HTTP/1.1 flag.
     */
    protected boolean http11 = true;


    /**
     * HTTP/0.9 flag.
     */
    protected boolean http09 = false;


    /**
     * Content delimitator for the request (if false, the connection will
     * be closed at the end of the request).
     */
    protected boolean contentDelimitation = true;


    /**
     * Is there an expectation ?
     */
    protected boolean expectation = false;


    /**
     * List of restricted user agents.
     */
    protected Pattern[] restrictedUserAgents = null;


    /**
     * Maximum number of Keep-Alive requests to honor.
     */
    protected int maxKeepAliveRequests = -1;

    /**
     * The number of seconds Tomcat will wait for a subsequent request
     * before closing the connection.
     */
    protected int keepAliveTimeout = -1;


    /**
     * SSL information.
     */
    protected SSLSupport sslSupport;


    /**
     * Socket associated with the current connection.
     */
    protected Socket socket;


    /**
     * Remote Address associated with the current connection.
     */
    protected String remoteAddr = null;


    /**
     * Remote Host associated with the current connection.
     */
    protected String remoteHost = null;


    /**
     * Local Host associated with the current connection.
     */
    protected String localName = null;



    /**
     * Local port to which the socket is connected
     */
    protected int localPort = -1;


    /**
     * Remote port to which the socket is connected
     */
    protected int remotePort = -1;


    /**
     * The local Host address.
     */
    protected String localAddr = null;


    /**
     * Maximum timeout on uploads. 5 minutes as in Apache HTTPD server.
     */
    protected int timeout = 300000;


    /**
     * Flag to disable setting a different time-out on uploads.
     */
    protected boolean disableUploadTimeout = false;


    /**
     * Allowed compression level.
     */
    protected int compressionLevel = 0;


    /**
     * Minimum contentsize to make compression.
     */
    protected int compressionMinSize = 2048;


    /**
     * Socket buffering.
     */
    protected int socketBuffer = -1;


    /**
     * Max saved post size.
     */
    protected int maxSavePostSize = 4 * 1024;


    /**
     * List of user agents to not use gzip with
     */
    protected Pattern noCompressionUserAgents[] = null;

    /**
     * List of MIMES which could be gzipped
     */
    protected String[] compressableMimeTypes =
    { "text/html", "text/xml", "text/plain" };


    /**
     * Host name (used to avoid useless B2C conversion on the host name).
     */
    protected char[] hostNameC = new char[0];


    /**
     * Associated endpoint.
     */
    protected JIoEndpoint endpoint;


    /**
     * Allow a customized the server header for the tin-foil hat folks.
     */
    protected String server = null;


    // ------------------------------------------------------------- Properties


    /**
     * Return compression level.
     */
    public String getCompression() {
        switch (compressionLevel) {
        case 0:
            return "off";
        case 1:
            return "on";
        case 2:
            return "force";
        }
        return "off";
    }


    /**
     * Set compression level.
     */
    public void setCompression(String compression) {
        if (compression.equals("on")) {
            this.compressionLevel = 1;
        } else if (compression.equals("force")) {
            this.compressionLevel = 2;
        } else if (compression.equals("off")) {
            this.compressionLevel = 0;
        } else {
            try {
                // Try to parse compression as an int, which would give the
                // minimum compression size
                compressionMinSize = Integer.parseInt(compression);
                this.compressionLevel = 1;
            } catch (Exception e) {
                this.compressionLevel = 0;
            }
        }
    }

    /**
     * Set Minimum size to trigger compression.
     */
    public void setCompressionMinSize(int compressionMinSize) {
        this.compressionMinSize = compressionMinSize;
    }


    /**
     * Add user-agent for which gzip compression didn't works
     * The user agent String given will be exactly matched
     * to the user-agent header submitted by the client.
     *
     * @param userAgent user-agent string
     */
    public void addNoCompressionUserAgent(String userAgent) {
        try {
            Pattern nRule = Pattern.compile(userAgent);
            noCompressionUserAgents =
                addREArray(noCompressionUserAgents, nRule);
        } catch (PatternSyntaxException pse) {
            log.error(sm.getString("http11processor.regexp.error", userAgent), pse);
        }
    }


    /**
     * Set no compression user agent list (this method is best when used with
     * a large number of connectors, where it would be better to have all of
     * them referenced a single array).
     */
    public void setNoCompressionUserAgents(Pattern[] noCompressionUserAgents) {
        this.noCompressionUserAgents = noCompressionUserAgents;
    }


    /**
     * Set no compression user agent list.
     * List contains users agents separated by ',' :
     *
     * ie: "gorilla,desesplorer,tigrus"
     */
    public void setNoCompressionUserAgents(String noCompressionUserAgents) {
        if (noCompressionUserAgents != null) {
            StringTokenizer st = new StringTokenizer(noCompressionUserAgents, ",");

            while (st.hasMoreTokens()) {
                addNoCompressionUserAgent(st.nextToken().trim());
            }
        }
    }

    /**
     * Add a mime-type which will be compressable
     * The mime-type String will be exactly matched
     * in the response mime-type header .
     *
     * @param mimeType mime-type string
     */
    public void addCompressableMimeType(String mimeType) {
        compressableMimeTypes =
            addStringArray(compressableMimeTypes, mimeType);
    }


    /**
     * Set compressable mime-type list (this method is best when used with
     * a large number of connectors, where it would be better to have all of
     * them referenced a single array).
     */
    public void setCompressableMimeTypes(String[] compressableMimeTypes) {
        this.compressableMimeTypes = compressableMimeTypes;
    }