Skip to main content
aboutsummaryrefslogtreecommitdiffstats
blob: 6bd15d612c6058bcd7d2e3b9e07c8e5a0c516dc9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
//
//  ========================================================================
//  Copyright (c) 1995-2013 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.util.Enumeration;
import java.util.HashMap;
import java.util.Locale;
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.eclipse.jetty.http.HttpMethods;
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.
 * <p/>
 * The cgi bin directory can be set with the "cgibinResourceBase" init parameter or it will default to the resource base of the context. If the
 * "cgibinResourceBaseIsRelative" init parameter is set the resource base is relative to the webapp. For example "WEB-INF/cgi" would work.
 * <br/>
 * Not that this only works for extracted war files as "jar cf" will not reserve the execute permissions on the cgi files.
 * <p/>
 * 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.
 * <p/>
 * The "Path" init param is passed to the exec environment as PATH. Note: Must be run unpacked somewhere in the filesystem.
 * <p/>
 * 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.
 */
public class CGI extends HttpServlet
{
    /**
     *
     */
    private static final long serialVersionUID = -6182088932884791073L;

    private static final Logger LOG = Log.getLogger(CGI.class);

    private boolean _ok;
    private File _docRoot;
    private String _path;
    private String _cmdPrefix;
    private EnvList _env;
    private boolean _ignoreExitState;
    private boolean _relative;

    /* ------------------------------------------------------------ */
    @Override
    public void init() throws ServletException
    {
        _env = new EnvList();
        _cmdPrefix = getInitParameter("commandPrefix");
        _relative = Boolean.parseBoolean(getInitParameter("cgibinResourceBaseIsRelative"));

        String tmp = getInitParameter("cgibinResourceBase");
        if (tmp == null)
        {
            tmp = getInitParameter("resourceBase");
            if (tmp == null)
                tmp = getServletContext().getRealPath("/");
        }
        else if (_relative)
        {
            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 = (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(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;
        }

        String pathInContext = (_relative?"":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;

        String bodyFormEncoded = null;
        if ((HttpMethods.POST.equals(req.getMethod()) || HttpMethods.PUT.equals(req.getMethod())) && "application/x-www-form-urlencoded".equals(req.getContentType()))
        {
            MultiMap<String> parameterMap = new MultiMap<String>();
            Enumeration names = req.getParameterNames();
            while (names.hasMoreElements())
            {
                String parameterName = (String)names.nextElement();
                parameterMap.addValues(parameterName, req.getParameterValues(parameterName));
            }
            bodyFormEncoded = UrlEncoded.encode(parameterMap, 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());
        if (bodyFormEncoded != null)
        {
            env.set("CONTENT_LENGTH", Integer.toString(bodyFormEncoded.length()));
        }
        else
        {
            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(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 execCmd = path;
        if ((execCmd.charAt(0) != '"') && (execCmd.indexOf(" ") >= 0))
            execCmd = "\"" + execCmd + "\"";
        if (_cmdPrefix != null)
            execCmd = _cmdPrefix + " " + execCmd;

        LOG.debug("Environment: " + env.getExportString());
        LOG.debug("Command: " + execCmd);

        Process p;
        if (dir == null)
            p = Runtime.getRuntime().exec(execCmd, env.getEnvArray());
        else
            p = Runtime.getRuntime().exec(execCmd, env.getEnvArray(), dir);

        // hook processes input to browser's output (async)
        if (bodyFormEncoded != null)
            writeProcessInput(p, bodyFormEncoded);
        else if (len > 0)
            writeProcessInput(p, req.getInputStream(), len);

        IO.copyThread(p.getErrorStream(), System.err);

        // 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(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: " + 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.debug(e);
                }
            }
            p.destroy();
            // LOG.debug("CGI: terminated!");
        }
    }

    private static void writeProcessInput(final Process p, final String input)
    {
        new Thread(new Runnable()
        {
            public void run()
            {
                try
                {
                    Writer outToCgi = new OutputStreamWriter(p.getOutputStream());
                    outToCgi.write(input);
                    outToCgi.close();
                }
                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()
        {
            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<String, String> envMap;

        EnvList()
        {
            envMap = new HashMap<String, String>();
        }

        EnvList(EnvList l)
        {
            envMap = new HashMap<String,String>(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();
        }
    }
}

Back to the top