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//========================================================================
//Copyright 2006 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//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.mortbay.servlet;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.mortbay.log.Log;
import org.mortbay.util.IO;
import org.mortbay.util.StringUtil;
//-----------------------------------------------------------------------------
/**
* CGI Servlet.
*
* The cgi bin directory can be set with the "cgibinResourceBase" init parameter
* or it will default to the resource base of the context.
*
* The "commandPrefix" init parameter may be used to set a prefix to all
* commands passed to exec. This can be used on systems that need assistance to
* execute a particular file type. For example on windows this can be set to
* "perl" so that perl scripts are executed.
*
* The "Path" init param is passed to the exec environment as PATH. Note: Must
* be run unpacked somewhere in the filesystem.
*
* Any initParameter that starts with ENV_ is used to set an environment
* variable with the name stripped of the leading ENV_ and using the init
* parameter value.
*
* @author Julian Gosnell
* @author Thanassis Papathanasiou - Some minor modifications for Jetty6 port
*/
public class CGI extends HttpServlet
{
private boolean _ok;
private File _docRoot;
private String _path;
private String _cmdPrefix;
private EnvList _env;
private boolean _ignoreExitState;
/* ------------------------------------------------------------ */
public void init() throws ServletException
{
_env=new EnvList();
_cmdPrefix=getInitParameter("commandPrefix");
String tmp=getInitParameter("cgibinResourceBase");
if (tmp==null)
{
tmp=getInitParameter("resourceBase");
if (tmp==null)
tmp=getServletContext().getRealPath("/");
}
if (tmp==null)
{
Log.warn("CGI: no CGI bin !");
return;
}
File dir=new File(tmp);
if (!dir.exists())
{
Log.warn("CGI: CGI bin does not exist - "+dir);
return;
}
if (!dir.canRead())
{
Log.warn("CGI: CGI bin is not readable - "+dir);
return;
}
if (!dir.isDirectory())
{
Log.warn("CGI: CGI bin is not a directory - "+dir);
return;
}
try
{
_docRoot=dir.getCanonicalFile();
}
catch (IOException e)
{
Log.warn("CGI: CGI bin failed - "+dir,e);
return;
}
_path=getInitParameter("Path");
if (_path!=null)
_env.set("PATH",_path);
_ignoreExitState="true".equalsIgnoreCase(getInitParameter("ignoreExitState"));
Enumeration e=getInitParameterNames();
while (e.hasMoreElements())
{
String n=(String)e.nextElement();
if (n!=null&&n.startsWith("ENV_"))
_env.set(n.substring(4),getInitParameter(n));
}
if(!_env.envMap.containsKey("SystemRoot"))
{
String os = System.getProperty("os.name");
if (os!=null && os.toLowerCase().indexOf("windows")!=-1)
{
String windir = System.getProperty("windir");
_env.set("SystemRoot", windir!=null ? windir : "C:\\WINDOWS");
}
}
_ok=true;
}
/* ------------------------------------------------------------ */
public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
{
if (!_ok)
{
res.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
return;
}
String pathInContext=StringUtil.nonNull(req.getServletPath())+StringUtil.nonNull(req.getPathInfo());
if (Log.isDebugEnabled())
{
Log.debug("CGI: ContextPath : "+req.getContextPath());
Log.debug("CGI: ServletPath : "+req.getServletPath());
Log.debug("CGI: PathInfo : "+req.getPathInfo());
Log.debug("CGI: _docRoot : "+_docRoot);
Log.debug("CGI: _path : "+_path);
Log.debug("CGI: _ignoreExitState: "+_ignoreExitState);
}
// pathInContext may actually comprises scriptName/pathInfo...We will
// walk backwards up it until we find the script - the rest must
// be the pathInfo;
String both=pathInContext;
String first=both;
String last="";
File exe=new File(_docRoot,first);
while ((first.endsWith("/")||!exe.exists())&&first.length()>=0)
{
int index=first.lastIndexOf('/');
first=first.substring(0,index);
last=both.substring(index,both.length());
exe=new File(_docRoot,first);
}
if (first.length()==0||!exe.exists()||exe.isDirectory()||!exe.getCanonicalPath().equals(exe.getAbsolutePath()))
{
res.sendError(404);
}
else
{
if (Log.isDebugEnabled())
{
Log.debug("CGI: script is "+exe);
Log.debug("CGI: pathInfo is "+last);
}
exec(exe,last,req,res);
}
}
/* ------------------------------------------------------------ */
/*
* @param root @param path @param req @param res @exception IOException
*/
private void exec(File command, String pathInfo, HttpServletRequest req, HttpServletResponse res) throws IOException
{
String path=command.getAbsolutePath();
File dir=command.getParentFile();
String scriptName=req.getRequestURI().substring(0,req.getRequestURI().length()-pathInfo.length());
String scriptPath=getServletContext().getRealPath(scriptName);
String pathTranslated=req.getPathTranslated();
int len=req.getContentLength();
if (len<0)
len=0;
if ((pathTranslated==null)||(pathTranslated.length()==0))
pathTranslated=path;
EnvList env=new EnvList(_env);
// these ones are from "The WWW Common Gateway Interface Version 1.1"
// look at :
// http://Web.Golux.Com/coar/cgi/draft-coar-cgi-v11-03-clean.html#6.1.1
env.set("AUTH_TYPE",req.getAuthType());
env.set("CONTENT_LENGTH",Integer.toString(len));
env.set("CONTENT_TYPE",req.getContentType());
env.set("GATEWAY_INTERFACE","CGI/1.1");
if ((pathInfo!=null)&&(pathInfo.length()>0))
{
env.set("PATH_INFO",pathInfo);
}
env.set("PATH_TRANSLATED",pathTranslated);
env.set("QUERY_STRING",req.getQueryString());
env.set("REMOTE_ADDR",req.getRemoteAddr());
env.set("REMOTE_HOST",req.getRemoteHost());
// The identity information reported about the connection by a
// RFC 1413 [11] request to the remote agent, if
// available. Servers MAY choose not to support this feature, or
// not to request the data for efficiency reasons.
// "REMOTE_IDENT" => "NYI"
env.set("REMOTE_USER",req.getRemoteUser());
env.set("REQUEST_METHOD",req.getMethod());
env.set("SCRIPT_NAME",scriptName);
env.set("SCRIPT_FILENAME",scriptPath);
env.set("SERVER_NAME",req.getServerName());
env.set("SERVER_PORT",Integer.toString(req.getServerPort()));
env.set("SERVER_PROTOCOL",req.getProtocol());
env.set("SERVER_SOFTWARE",getServletContext().getServerInfo());
Enumeration enm=req.getHeaderNames();
while (enm.hasMoreElements())
{
String name=(String)enm.nextElement();
String value=req.getHeader(name);
env.set("HTTP_"+name.toUpperCase().replace('-','_'),value);
}
// these extra ones were from printenv on www.dev.nomura.co.uk
env.set("HTTPS",(req.isSecure()?"ON":"OFF"));
// "DOCUMENT_ROOT" => root + "/docs",
// "SERVER_URL" => "NYI - http://us0245",
// "TZ" => System.getProperty("user.timezone"),
// are we meant to decode args here ? or does the script get them
// via PATH_INFO ? if we are, they should be decoded and passed
// into exec here...
String execCmd=path;
if ((execCmd.charAt(0)!='"')&&(execCmd.indexOf(" ")>=0))
execCmd="\""+execCmd+"\"";
if (_cmdPrefix!=null)
execCmd=_cmdPrefix+" "+execCmd;
Process p=(dir==null)?Runtime.getRuntime().exec(execCmd,env.getEnvArray()):Runtime.getRuntime().exec(execCmd,env.getEnvArray(),dir);
// hook processes input to browser's output (async)
final InputStream inFromReq=req.getInputStream();
final OutputStream outToCgi=p.getOutputStream();
final int inLength=len;
IO.copyThread(p.getErrorStream(),System.err);
new Thread(new Runnable()
{
public void run()
{
try
{
if (inLength>0)
IO.copy(inFromReq,outToCgi,inLength);
outToCgi.close();
}
catch (IOException e)
{
Log.ignore(e);
}
}
}).start();
// hook processes output to browser's input (sync)
// if browser closes stream, we should detect it and kill process...
OutputStream os = null;
try
{
// read any headers off the top of our input stream
// NOTE: Multiline header items not supported!
String line=null;
InputStream inFromCgi=p.getInputStream();
//br=new BufferedReader(new InputStreamReader(inFromCgi));
//while ((line=br.readLine())!=null)
while( (line = getTextLineFromStream( inFromCgi )).length() > 0 )
{
if (!line.startsWith("HTTP"))
{
int k=line.indexOf(':');
if (k>0)
{
String key=line.substring(0,k).trim();
String value = line.substring(k+1).trim();
if ("Location".equals(key))
{
res.sendRedirect(value);
}
else if ("Status".equals(key))
{
String[] token = value.split( " " );
int status=Integer.parseInt(token[0]);
res.setStatus(status);
}
else
{
// add remaining header items to our response header
res.addHeader(key,value);
}
}
}
}
// copy cgi content to response stream...
os = res.getOutputStream();
IO.copy(inFromCgi, os);
p.waitFor();
if (!_ignoreExitState)
{
int exitValue=p.exitValue();
if (0!=exitValue)
{
Log.warn("Non-zero exit status ("+exitValue+") from CGI program: "+path);
if (!res.isCommitted())
res.sendError(500,"Failed to exec CGI");
}
}
}
catch (IOException e)
{
// browser has probably closed its input stream - we
// terminate and clean up...
Log.debug("CGI: Client closed connection!");
}
catch (InterruptedException ie)
{
Log.debug("CGI: interrupted!");
}
finally
{
if( os != null )
{
try
{
os.close();
}
catch(Exception e)
{
Log.ignore(e);
}
}
os = null;
p.destroy();
// Log.debug("CGI: terminated!");
}
}
/**
* Utility method to get a line of text from the input stream.
* @param is the input stream
* @return the line of text
* @throws IOException
*/
private String getTextLineFromStream( InputStream is ) throws IOException {
StringBuffer buffer = new StringBuffer();
int b;
while( (b = is.read()) != -1 && b != (int) '\n' ) {
buffer.append( (char) b );
}
return buffer.toString().trim();
}
/* ------------------------------------------------------------ */
/**
* private utility class that manages the Environment passed to exec.
*/
private static class EnvList
{
private Map envMap;
EnvList()
{
envMap=new HashMap();
}
EnvList(EnvList l)
{
envMap=new HashMap(l.envMap);
}
/**
* Set a name/value pair, null values will be treated as an empty String
*/
public void set(String name, String value)
{
envMap.put(name,name+"="+StringUtil.nonNull(value));
}
/** Get representation suitable for passing to exec. */
public String[] getEnvArray()
{
return (String[])envMap.values().toArray(new String[envMap.size()]);
}
public String toString()
{
return envMap.toString();
}
}
}
