org.eclipse.jetty.servlets.CGI Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.servlets;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.HttpMethod;
import org.eclipse.jetty.util.IO;
import org.eclipse.jetty.util.MultiMap;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.UrlEncoded;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
//-----------------------------------------------------------------------------
/**
* CGI Servlet.
*
*
* The following init parameters are used to configure this servlet:
*
* - cgibinResourceBase
* - Path to the cgi bin directory if set or it will default to the resource base of the context.
* - resourceBase
* - An alias for cgibinResourceBase.
* - cgibinResourceBaseIsRelative
* - If true then cgibinResourceBase is relative to the webapp (eg "WEB-INF/cgi")
* - commandPrefix
* - 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.
* - Path
* - passed to the exec environment as PATH.
* - ENV_*
* - used to set an arbitrary environment variable with the name stripped of the leading ENV_ and using the init parameter value
* - useFullPath
* - If true, the full URI path within the context is used for the exec command, otherwise a search is done for a partial URL that matches an exec Command
* - ignoreExitState
* - If true then do not act on a non-zero exec exit status")
*
*
*/
public class CGI extends HttpServlet
{
private static final long serialVersionUID = -6182088932884791074L;
private static final Logger LOG = Log.getLogger(CGI.class);
private boolean _ok;
private File _docRoot;
private boolean _cgiBinProvided;
private String _path;
private String _cmdPrefix;
private boolean _useFullPath;
private EnvList _env;
private boolean _ignoreExitState;
private boolean _relative;
/* ------------------------------------------------------------ */
@Override
public void init() throws ServletException
{
_env = new EnvList();
_cmdPrefix = getInitParameter("commandPrefix");
_useFullPath = Boolean.parseBoolean(getInitParameter("useFullPath"));
_relative = Boolean.parseBoolean(getInitParameter("cgibinResourceBaseIsRelative"));
String tmp = getInitParameter("cgibinResourceBase");
if (tmp != null)
_cgiBinProvided = true;
else
{
tmp = getInitParameter("resourceBase");
if (tmp != null)
_cgiBinProvided = true;
else
tmp = getServletContext().getRealPath("/");
}
if (_relative && _cgiBinProvided)
{
tmp = getServletContext().getRealPath(tmp);
}
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 = 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(Locale.ENGLISH).indexOf("windows") != -1)
{
_env.set("SystemRoot","C:\\WINDOWS");
}
}
_ok = true;
}
/* ------------------------------------------------------------ */
@Override
public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
{
if (!_ok)
{
res.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
return;
}
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 pathInContext = (_relative ? "" : StringUtil.nonNull(req.getServletPath())) + StringUtil.nonNull(req.getPathInfo());
File execCmd = new File(_docRoot, pathInContext);
String pathInfo = pathInContext;
if(!_useFullPath)
{
String path = pathInContext;
String info = "";
// Search docroot for a matching execCmd
while ((path.endsWith("/") || !execCmd.exists()) && path.length() >= 0)
{
int index = path.lastIndexOf('/');
path = path.substring(0,index);
info = pathInContext.substring(index,pathInContext.length());
execCmd = new File(_docRoot,path);
}
if (path.length() == 0 || !execCmd.exists() || execCmd.isDirectory() || !execCmd.getCanonicalPath().equals(execCmd.getAbsolutePath()))
{
res.sendError(404);
}
pathInfo = info;
}
exec(execCmd,pathInfo,req,res);
}
/** executes the CGI process
/*
* @param command the command to execute, this command is prefixed by
* the context parameter "commandPrefix".
* @param pathInfo The PATH_INFO to process,
* see http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#getPathInfo%28%29. Cannot be null
* @param req
* @param res
* @exception IOException
*/
private void exec(File command, String pathInfo, HttpServletRequest req, HttpServletResponse res) throws IOException
{
assert req != null;
assert res != null;
assert pathInfo != null;
assert command != null;
if (LOG.isDebugEnabled())
{
LOG.debug("CGI: script is " + command);
LOG.debug("CGI: pathInfo is " + pathInfo);
}
String bodyFormEncoded = null;
if ((HttpMethod.POST.equals(req.getMethod()) || HttpMethod.PUT.equals(req.getMethod())) && "application/x-www-form-urlencoded".equals(req.getContentType()))
{
MultiMap parameterMap = new MultiMap();
Enumeration names = req.getParameterNames();
while (names.hasMoreElements())
{
String parameterName = names.nextElement();
parameterMap.addValues(parameterName, req.getParameterValues(parameterName));
}
bodyFormEncoded = UrlEncoded.encode(parameterMap, Charset.forName(req.getCharacterEncoding()), true);
}
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());
int contentLen = req.getContentLength();
if (contentLen < 0)
contentLen = 0;
if (bodyFormEncoded != null)
{
env.set("CONTENT_LENGTH", Integer.toString(bodyFormEncoded.length()));
}
else
{
env.set("CONTENT_LENGTH", Integer.toString(contentLen));
}
env.set("CONTENT_TYPE", req.getContentType());
env.set("GATEWAY_INTERFACE", "CGI/1.1");
if (pathInfo.length() > 0)
{
env.set("PATH_INFO", pathInfo);
}
String pathTranslated = req.getPathTranslated();
if ((pathTranslated == null) || (pathTranslated.length() == 0))
pathTranslated = 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());
String scriptPath;
String scriptName;
// use docRoot for scriptPath, too
if(_cgiBinProvided)
{
scriptPath = command.getAbsolutePath();
scriptName = scriptPath.substring(_docRoot.getAbsolutePath().length());
}
else
{
String requestURI = req.getRequestURI();
scriptName = requestURI.substring(0,requestURI.length() - pathInfo.length());
scriptPath = getServletContext().getRealPath(scriptName);
}
env.set("SCRIPT_FILENAME", scriptPath);
env.set("SCRIPT_NAME", scriptName);
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 = enm.nextElement();
String value = req.getHeader(name);
env.set("HTTP_" + name.toUpperCase(Locale.ENGLISH).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 absolutePath = command.getAbsolutePath();
String execCmd = absolutePath;
// escape the execCommand
if (execCmd.length() > 0 && execCmd.charAt(0) != '"' && execCmd.indexOf(" ") >= 0)
execCmd = "\"" + execCmd + "\"";
if (_cmdPrefix != null)
execCmd = _cmdPrefix + " " + execCmd;
assert execCmd != null;
LOG.debug("Environment: " + env.getExportString());
LOG.debug("Command: " + execCmd);
final Process p = Runtime.getRuntime().exec(execCmd, env.getEnvArray(), _docRoot);
// hook processes input to browser's output (async)
if (bodyFormEncoded != null)
writeProcessInput(p, bodyFormEncoded);
else if (contentLen > 0)
writeProcessInput(p, req.getInputStream(), contentLen);
// hook processes output to browser's input (sync)
// if browser closes stream, we should detect it and kill process...
OutputStream os = null;
AsyncContext async=req.startAsync();
try
{
async.start(new Runnable()
{
@Override
public void run()
{
try
{
IO.copy(p.getErrorStream(), System.err);
}
catch (IOException e)
{
LOG.warn(e);
}
}
});
// 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(res.encodeRedirectURL(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: " + absolutePath);
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!", e);
}
catch (InterruptedException ie)
{
LOG.debug("CGI: interrupted!");
}
finally
{
if (os != null)
{
try
{
os.close();
}
catch (Exception e)
{
LOG.debug(e);
}
}
p.destroy();
// LOG.debug("CGI: terminated!");
async.complete();
}
}
private static void writeProcessInput(final Process p, final String input)
{
new Thread(new Runnable()
{
@Override
public void run()
{
try
{
try (Writer outToCgi = new OutputStreamWriter(p.getOutputStream()))
{
outToCgi.write(input);
}
}
catch (IOException e)
{
LOG.debug(e);
}
}
}).start();
}
private static void writeProcessInput(final Process p, final InputStream input, final int len)
{
if (len <= 0) return;
new Thread(new Runnable()
{
@Override
public void run()
{
try
{
OutputStream outToCgi = p.getOutputStream();
IO.copy(input, outToCgi, len);
outToCgi.close();
}
catch (IOException e)
{
LOG.debug(e);
}
}
}).start();
}
/**
* 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 static String getTextLineFromStream(InputStream is) throws IOException
{
StringBuilder buffer = new StringBuilder();
int b;
while ((b = is.read()) != -1 && b != '\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 envMap.values().toArray(new String[envMap.size()]);
}
public String getExportString()
{
StringBuilder sb = new StringBuilder();
for (String variable : getEnvArray())
{
sb.append("export \"");
sb.append(variable);
sb.append("\"; ");
}
return sb.toString();
}
@Override
public String toString()
{
return envMap.toString();
}
}
}