container/catalina/src/share/org/apache/catalina/ssi/SSIExec.java

/*
 * Copyright 1999,2004 The Apache Software Foundation.
 * 
 * Licensed 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.catalina.ssi;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

import org.apache.catalina.util.IOTools;

/**
 * Implements the Server-side #exec command
 * 
 * @author Bip Thelin
 * @author Amy Roh
 * @author Dan Sandberg
 * @version $Revision$, $Date$
 *
 */
public class SSIExec implements SSICommand {   
    protected SSIInclude ssiInclude = new SSIInclude();
    protected final static int BUFFER_SIZE = 1024;

    /**
     * @see SSICommand
     */
    public void process(SSIMediator ssiMediator,
			String[] paramNames,
			String[] paramValues,
			PrintWriter writer) {

	String configErrMsg = ssiMediator.getConfigErrMsg();
	String paramName = paramNames[0];
	String paramValue = paramValues[0];

        if ( paramName.equalsIgnoreCase("cgi") ) {
	    ssiInclude.process( ssiMediator, new String[] {"virtual"}, new String[] {paramValue}, writer );
        } else if ( paramName.equalsIgnoreCase("cmd") ) {
	    boolean foundProgram = false;
	    try {
		Runtime rt = Runtime.getRuntime();
		Process proc = rt.exec( paramValue );
		foundProgram = true;

		BufferedReader stdOutReader = new BufferedReader(new InputStreamReader(proc.getInputStream()));
		BufferedReader stdErrReader = new BufferedReader(new InputStreamReader(proc.getErrorStream()));

		char[] buf = new char[BUFFER_SIZE];
		IOTools.flow( stdErrReader, writer, buf );
		IOTools.flow( stdOutReader, writer, buf );
		proc.waitFor();
	    } catch ( InterruptedException e ) {
		ssiMediator.log( "Couldn't exec file: " + paramValue, e );
		writer.write( configErrMsg );
	    } catch ( IOException e ) {
		if ( !foundProgram ) {
		    //apache doesn't output an error message if it can't find a program
		}
		ssiMediator.log( "Couldn't exec file: " + paramValue, e );
	    }
	} 
    }
}