1 const char filters_rcs[] = "$Id: filters.c,v 1.99 2008/02/03 13:57:58 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/filters.c,v $
6 * Purpose : Declares functions to parse/crunch headers and pages.
7 * Functions declared include:
8 * `acl_addr', `add_stats', `block_acl', `block_imageurl',
9 * `block_url', `url_actions', `domain_split',
10 * `filter_popups', `forward_url', 'redirect_url',
11 * `ij_untrusted_url', `intercept_url', `pcrs_filter_respose',
12 * `ijb_send_banner', `trust_url', `gif_deanimate_response',
13 * `jpeg_inspect_response', `execute_single_pcrs_command',
14 * `rewrite_url', `get_last_url'
16 * Copyright : Written by and Copyright (C) 2001, 2004-2007 the SourceForge
17 * Privoxy team. http://www.privoxy.org/
19 * Based on the Internet Junkbuster originally written
20 * by and Copyright (C) 1997 Anonymous Coders and
21 * Junkbusters Corporation. http://www.junkbusters.com
23 * This program is free software; you can redistribute it
24 * and/or modify it under the terms of the GNU General
25 * Public License as published by the Free Software
26 * Foundation; either version 2 of the License, or (at
27 * your option) any later version.
29 * This program is distributed in the hope that it will
30 * be useful, but WITHOUT ANY WARRANTY; without even the
31 * implied warranty of MERCHANTABILITY or FITNESS FOR A
32 * PARTICULAR PURPOSE. See the GNU General Public
33 * License for more details.
35 * The GNU General Public License should be included with
36 * this file. If not, you can view it at
37 * http://www.gnu.org/copyleft/gpl.html
38 * or write to the Free Software Foundation, Inc., 59
39 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
43 * Revision 1.99 2008/02/03 13:57:58 fabiankeil
44 * Add SOCKS5 support for forward-override{}.
46 * Revision 1.98 2008/01/04 17:43:45 fabiankeil
47 * Improve the warning messages that get logged if the action files
48 * "enable" filters but no filters of that type have been loaded.
50 * Revision 1.97 2007/11/30 15:37:03 fabiankeil
51 * Use freez instead of free.
53 * Revision 1.96 2007/10/19 16:53:28 fabiankeil
54 * Add helper function to check if any content filters are enabled.
56 * Revision 1.95 2007/10/17 19:31:20 fabiankeil
57 * Omitting the zero chunk that ends the chunk transfer encoding seems
58 * to be the new black. Log the problem and continue filtering anyway.
60 * Revision 1.94 2007/09/29 13:20:20 fabiankeil
61 * Remove two redundant and one useless log messages.
63 * Revision 1.93 2007/09/29 10:21:16 fabiankeil
64 * - Move get_filter_function() from jcc.c to filters.c
65 * so the filter functions can be static.
66 * - Don't bother filtering body-less responses.
68 * Revision 1.92 2007/09/28 16:38:55 fabiankeil
69 * - Execute content filters through execute_content_filter().
70 * - Add prepare_for_filtering() so filter functions don't have to
71 * care about de-chunking and decompression. As a side effect this enables
72 * decompression for gif_deanimate_response() and jpeg_inspect_response().
73 * - Change remove_chunked_transfer_coding()'s return type to jb_err.
74 * Some clowns feel like chunking empty responses in which case
75 * (size == 0) is valid but previously would be interpreted as error.
77 * Revision 1.91 2007/09/02 15:31:20 fabiankeil
78 * Move match_portlist() from filter.c to urlmatch.c.
79 * It's used for url matching, not for filtering.
81 * Revision 1.90 2007/09/02 12:44:17 fabiankeil
82 * Remove newline at the end of a log_error() message.
84 * Revision 1.89 2007/08/05 13:42:23 fabiankeil
85 * #1763173 from Stefan Huehner: declare some more functions static.
87 * Revision 1.88 2007/06/01 16:41:11 fabiankeil
88 * Add forward-override{} to change the forwarding settings through
89 * action sections. This is mainly interesting to forward different
90 * clients differently (for example based on User-Agent or request
93 * Revision 1.87 2007/04/30 15:53:10 fabiankeil
94 * Make sure filters with dynamic jobs actually use them.
96 * Revision 1.86 2007/04/30 15:03:28 fabiankeil
97 * - Introduce dynamic pcrs jobs that can resolve variables.
98 * - Don't run redirect functions more than once,
99 * unless they are activated more than once.
101 * Revision 1.85 2007/03/21 12:24:47 fabiankeil
102 * - Log the content size after decompression in decompress_iob()
103 * instead of pcrs_filter_response().
105 * Revision 1.84 2007/03/20 15:16:34 fabiankeil
106 * Use dedicated header filter actions instead of abusing "filter".
107 * Replace "filter-client-headers" and "filter-client-headers"
108 * with "server-header-filter" and "client-header-filter".
110 * Revision 1.83 2007/03/17 15:20:05 fabiankeil
111 * New config option: enforce-blocks.
113 * Revision 1.82 2007/03/13 11:28:43 fabiankeil
114 * - Fix port handling in acl_addr() and use a temporary acl spec
115 * copy so error messages don't contain a truncated version.
116 * - Log size of iob before and after decompression.
118 * Revision 1.81 2007/03/05 14:40:53 fabiankeil
119 * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
120 * - Hide the "Go there anyway" link for blocked CONNECT
121 * requests where going there anyway doesn't work anyway.
123 * Revision 1.80 2007/02/07 10:55:20 fabiankeil
124 * - Save the reason for generating http_responses.
125 * - Block (+block) with status code 403 instead of 404.
126 * - Use a different kludge to remember a failed decompression.
128 * Revision 1.79 2007/01/31 16:21:38 fabiankeil
129 * Search for Max-Forwards headers case-insensitive,
130 * don't generate the "501 unsupported" message for invalid
131 * Max-Forwards values and don't increase negative ones.
133 * Revision 1.78 2007/01/28 13:41:18 fabiankeil
134 * - Add HEAD support to finish_http_response.
135 * - Add error favicon to internal HTML error messages.
137 * Revision 1.77 2007/01/12 15:36:44 fabiankeil
138 * Mark *csp as immutable for is_untrusted_url()
139 * and is_imageurl(). Closes FR 1237736.
141 * Revision 1.76 2007/01/01 19:36:37 fabiankeil
142 * Integrate a modified version of Wil Mahan's
143 * zlib patch (PR #895531).
145 * Revision 1.75 2006/12/29 18:30:46 fabiankeil
146 * Fixed gcc43 conversion warnings,
147 * changed sprintf calls to snprintf.
149 * Revision 1.74 2006/12/24 17:37:38 fabiankeil
150 * Adjust comment in pcrs_filter_response()
151 * to recent pcrs changes. Hohoho.
153 * Revision 1.73 2006/12/23 16:01:02 fabiankeil
154 * Don't crash if pcre returns an error code
155 * that pcrs didn't expect. Fixes BR 1621173.
157 * Revision 1.72 2006/12/22 18:52:53 fabiankeil
158 * Modified is_untrusted_url to complain in case of
159 * write errors and to give a reason when adding new
160 * entries to the trustfile. Closes FR 1097611.
162 * Revision 1.71 2006/12/22 14:24:52 fabiankeil
163 * Skip empty filter files in pcrs_filter_response,
164 * but don't ignore the ones that come afterwards.
165 * Fixes parts of BR 1619208.
167 * Revision 1.70 2006/12/09 13:33:15 fabiankeil
168 * Added some sanity checks for get_last_url().
169 * Fixed possible segfault caused by my last commit.
171 * Revision 1.69 2006/12/08 12:39:13 fabiankeil
172 * Let get_last_url() catch https URLs as well.
174 * Revision 1.68 2006/12/05 14:45:48 fabiankeil
175 * Make sure get_last_url() behaves like advertised
176 * and fast-redirects{} can be combined with redirect{}.
178 * Revision 1.67 2006/11/28 15:19:43 fabiankeil
179 * Implemented +redirect{s@foo@bar@} to generate
180 * a redirect based on a rewritten version of the
183 * Revision 1.66 2006/09/23 13:26:38 roro
184 * Replace TABs by spaces in source code.
186 * Revision 1.65 2006/09/21 12:54:43 fabiankeil
187 * Fix +redirect{}. Didn't work with -fast-redirects.
189 * Revision 1.64 2006/08/31 10:55:49 fabiankeil
190 * Block requests for untrusted URLs with status
191 * code 403 instead of 200.
193 * Revision 1.63 2006/08/31 10:11:28 fabiankeil
194 * Don't free p which is still in use and will be later
195 * freed by free_map(). Don't claim the referrer is unknown
196 * when the client didn't set one.
198 * Revision 1.62 2006/08/14 00:27:47 david__schmidt
199 * Feature request 595948: Re-Filter logging in single line
201 * Revision 1.61 2006/08/03 02:46:41 david__schmidt
202 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
204 * Revision 1.60 2006/07/18 14:48:46 david__schmidt
205 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
206 * with what was really the latest development (the v_3_0_branch branch)
208 * Revision 1.58.2.9 2006/01/29 23:10:56 david__schmidt
209 * Multiple filter file support
211 * Revision 1.58.2.8 2005/05/07 21:50:55 david__schmidt
212 * A few memory leaks plugged (mostly on error paths)
214 * Revision 1.58.2.7 2004/10/03 12:53:32 david__schmidt
215 * Add the ability to check jpeg images for invalid
216 * lengths of comment blocks. Defensive strategy
217 * against the exploit:
218 * Microsoft Security Bulletin MS04-028
219 * Buffer Overrun in JPEG Processing (GDI+) Could
220 * Allow Code Execution (833987)
221 * Enabled with +inspect-jpegs in actions files.
223 * Revision 1.58.2.6 2003/12/06 22:18:27 gliptak
224 * Correcting compile problem with FEATURE_IMAGE_BLOCKING
226 * Revision 1.58.2.5 2003/11/11 13:10:31 oes
227 * Fixed bug #839859: "See why" link URL now gets url-encoded.
229 * Revision 1.58.2.4 2003/02/28 12:52:45 oes
232 * Revision 1.58.2.3 2002/09/25 14:51:51 oes
233 * Added basic support for OPTIONS and TRACE HTTP methods:
234 * New function direct_response which handles OPTIONS and
235 * TRACE requests whose Max-Forwards header field is zero.
237 * Revision 1.58.2.2 2002/08/01 17:18:28 oes
238 * Fixed BR 537651 / SR 579724 (MSIE image detect improper for IE/Mac)
240 * Revision 1.58.2.1 2002/07/26 15:18:53 oes
241 * - Bugfix: Executing a filters without jobs no longer results in
242 * turing off *all* filters.
243 * - Security fix: Malicious web servers can't cause a seg fault
244 * through bogus chunk sizes anymore
246 * Revision 1.58 2002/04/24 02:11:17 oes
247 * Jon's multiple AF patch: url_actions now evaluates rules
250 * Revision 1.57 2002/04/08 20:38:34 swa
253 * Revision 1.56 2002/04/05 15:51:24 oes
254 * - bugfix: error-pages now get correct request protocol
255 * - fix for invalid HTML in trust info
257 * Revision 1.55 2002/04/02 16:13:51 oes
258 * Fix: No "Go there anyway" for SSL
260 * Revision 1.54 2002/04/02 14:55:56 oes
261 * Bugfix: is_untrusted_url() now depends on FEATURE_TRUST, not FEATURE_COOKIE_JAR
263 * Revision 1.53 2002/03/26 22:29:54 swa
264 * we have a new homepage!
266 * Revision 1.52 2002/03/24 16:35:57 jongfoster
269 * Revision 1.51 2002/03/24 15:23:33 jongfoster
272 * Revision 1.50 2002/03/24 13:25:43 swa
273 * name change related issues
275 * Revision 1.49 2002/03/16 20:29:14 oes
278 * Revision 1.48 2002/03/13 20:25:34 oes
279 * Better logging for content filters
281 * Revision 1.47 2002/03/13 00:30:52 jongfoster
283 * Added option of always sending redirect for imageblock,
284 * currently disabled with #if 0.
286 * Revision 1.46 2002/03/12 01:42:49 oes
287 * Introduced modular filters
289 * Revision 1.45 2002/03/08 16:47:50 oes
290 * Added choice beween GIF and PNG built-in images
292 * Revision 1.44 2002/03/07 03:49:31 oes
293 * - Fixed compiler warnings etc
294 * - Changed built-in images from GIF to PNG
295 * (with regard to Unisys patent issue)
296 * - Added a 4x4 pattern PNG which is less intrusive
297 * than the logo but also clearly marks the deleted banners
299 * Revision 1.43 2002/01/22 23:51:59 jongfoster
300 * Replacing strsav() with the safer string_append().
302 * Adding missing html_encode() to error message generators. Where encoded
303 * and unencoded versions of a string were provided, removing the unencoded
306 * Revision 1.42 2002/01/17 21:00:32 jongfoster
307 * Moving all our URL and URL pattern parsing code to urlmatch.c.
309 * Using a single, simple url_match(pattern,url) function - rather than
310 * the 3-line match routine which was repeated all over the place.
312 * Renaming free_url to free_url_spec, since it frees a struct url_spec.
314 * Using parse_http_url() to parse URLs without faking a HTTP
315 * request line for parse_http_request().
317 * Revision 1.41 2001/11/13 00:14:07 jongfoster
318 * Fixing stupid bug now I've figured out what || means.
319 * (It always returns 0 or 1, not one of it's paramaters.)
321 * Revision 1.40 2001/10/26 17:37:55 oes
322 * - Re-enabled Netscape 200/404 bug workaround in block_url():
323 * - Removed OS/2 special case
324 * - Made block_url() independant from sed() having been run
325 * - Made trust_url independant from sed() having been run
326 * - Made is_imageurl independant from sed() having been run.
327 * It now checks User-Agent: and Accept: by itself.
330 * Revision 1.39 2001/10/25 03:40:48 david__schmidt
331 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
332 * threads to call select() simultaneously. So, it's time to do a real, live,
333 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
334 * (native). Both versions will work, but using __OS2__ offers multi-threading.
336 * Revision 1.38 2001/10/23 21:32:33 jongfoster
337 * Adding error-checking to selected functions
339 * Revision 1.37 2001/10/22 15:33:56 david__schmidt
340 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
341 * filters.c. Added a FIXME in front of the offending code. I'll gladly
342 * put in a better/more robust fix for all parties if one is presented...
343 * It seems that just returning 200 instead of 404 would pretty much fix
344 * it for everyone, but I don't know all the history of the problem.
346 * Revision 1.36 2001/10/10 16:44:16 oes
347 * Added match_portlist function
349 * Revision 1.35 2001/10/07 15:41:23 oes
350 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
352 * New function remove_chunked_transfer_coding that strips chunked
353 * transfer coding to plain and is called by pcrs_filter_response
354 * and gif_deanimate_response if neccessary
356 * Improved handling of zero-change re_filter runs
358 * pcrs_filter_response and gif_deanimate_response now remove
359 * chunked transfer codeing before processing the body.
361 * Revision 1.34 2001/09/20 15:49:36 steudten
363 * Fix BUG: Change int size to size_t size in pcrs_filter_response().
364 * See cgi.c fill_template().
366 * Revision 1.33 2001/09/16 17:05:14 jongfoster
367 * Removing unused #include showarg.h
369 * Revision 1.32 2001/09/16 13:21:27 jongfoster
370 * Changes to use new list functions.
372 * Revision 1.31 2001/09/16 11:38:02 jongfoster
373 * Splitting fill_template() into 2 functions:
374 * template_load() loads the file
375 * template_fill() performs the PCRS regexps.
376 * This is because the CGI edit interface has a "table row"
377 * template which is used many times in the page - this
378 * change means it's only loaded from disk once.
380 * Revision 1.30 2001/09/16 11:00:10 jongfoster
381 * New function alloc_http_response, for symmetry with free_http_response
383 * Revision 1.29 2001/09/13 23:32:40 jongfoster
384 * Moving image data to cgi.c rather than cgi.h
385 * Fixing a GPF under Win32 (and any other OS that protects global
386 * constants from being written to).
388 * Revision 1.28 2001/09/10 10:18:51 oes
389 * Silenced compiler warnings
391 * Revision 1.27 2001/08/05 16:06:20 jongfoster
392 * Modifiying "struct map" so that there are now separate header and
393 * "map_entry" structures. This means that functions which modify a
394 * map no longer need to return a pointer to the modified map.
395 * Also, it no longer reverses the order of the entries (which may be
396 * important with some advanced template substitutions).
398 * Revision 1.26 2001/07/30 22:08:36 jongfoster
399 * Tidying up #defines:
400 * - All feature #defines are now of the form FEATURE_xxx
401 * - Permanently turned off WIN_GUI_EDIT
402 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
404 * Revision 1.25 2001/07/26 10:09:46 oes
405 * Made browser detection a little less naive
407 * Revision 1.24 2001/07/25 17:22:51 oes
408 * Added workaround for Netscape bug that prevents display of page when loading a component fails.
410 * Revision 1.23 2001/07/23 13:40:12 oes
411 * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
413 * Revision 1.22 2001/07/18 12:29:34 oes
414 * - Made gif_deanimate_response respect
415 * csp->action->string[ACTION_STRING_DEANIMATE]
416 * - Logging cosmetics
418 * Revision 1.21 2001/07/13 13:59:53 oes
419 * - Introduced gif_deanimate_response which shares the
420 * generic content modification interface of pcrs_filter_response
421 * and acts as a wrapper to deanimate.c:gif_deanimate()
422 * - Renamed re_process_buffer to pcrs_filter_response
423 * - pcrs_filter_response now returns NULL on failiure
424 * - Removed all #ifdef PCRS
426 * Revision 1.20 2001/07/01 17:01:04 oes
427 * Added comments and missing return statement in is_untrusted_url()
429 * Revision 1.19 2001/06/29 21:45:41 oes
430 * Indentation, CRLF->LF, Tab-> Space
432 * Revision 1.18 2001/06/29 13:27:38 oes
433 * - Cleaned up, renamed and reorderd functions
434 * and improved comments
437 * - Ported to CGI platform. Now delivers
438 * http_response or NULL
439 * - Unified HTML and GIF generation (moved image detection
440 * and GIF generation here from jcc.c:chat())
441 * - Fixed HTTP status to:
442 * - 403 (Forbidden) for the "blocked" HTML message
443 * - 200 (OK) for GIF answers
444 * - 302 (Redirect) for redirect to GIF
447 * - Ported to CGI platform. Now delivers
448 * http_response or NULL
449 * - Separated detection of untrusted URL into
450 * (bool)is_untrusted_url
451 * - Added enforcement of untrusted requests
453 * - Moved redirect_url() from cgi.c to here
454 * and ported it to the CGI platform
456 * - Removed logentry from cancelled commit
458 * Revision 1.17 2001/06/09 10:55:28 jongfoster
459 * Changing BUFSIZ ==> BUFFER_SIZE
461 * Revision 1.16 2001/06/07 23:10:26 jongfoster
462 * Allowing unanchored domain patterns to back off and retry
463 * if they partially match. Optimized right-anchored patterns.
464 * Moving ACL and forward files into config file.
465 * Replacing struct gateway with struct forward_spec
467 * Revision 1.15 2001/06/03 19:12:00 oes
468 * extracted-CGI relevant stuff
470 * Revision 1.14 2001/06/01 10:30:55 oes
471 * Added optional left-anchoring to domaincmp
473 * Revision 1.13 2001/05/31 21:21:30 jongfoster
474 * Permissionsfile / actions file changes:
475 * - Changed "permission" to "action" throughout
476 * - changes to file format to allow string parameters
477 * - Moved helper functions to actions.c
479 * Revision 1.12 2001/05/31 17:35:20 oes
481 * - Enhanced domain part globbing with infix and prefix asterisk
482 * matching and optional unanchored operation
484 * Revision 1.11 2001/05/29 11:53:23 oes
485 * "See why" link added to "blocked" page
487 * Revision 1.10 2001/05/29 09:50:24 jongfoster
488 * Unified blocklist/imagelist/permissionslist.
489 * File format is still under discussion, but the internal changes
492 * Also modified interceptor behaviour:
493 * - We now intercept all URLs beginning with one of the following
494 * prefixes (and *only* these prefixes):
496 * * http://ijbswa.sf.net/config/
497 * * http://ijbswa.sourceforge.net/config/
498 * - New interceptors "home page" - go to http://i.j.b/ to see it.
499 * - Internal changes so that intercepted and fast redirect pages
500 * are not replaced with an image.
501 * - Interceptors now have the option to send a binary page direct
502 * to the client. (i.e. ijb-send-banner uses this)
503 * - Implemented show-url-info interceptor. (Which is why I needed
504 * the above interceptors changes - a typical URL is
505 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
506 * The previous mechanism would not have intercepted that, and
507 * if it had been intercepted then it then it would have replaced
510 * Revision 1.9 2001/05/27 22:17:04 oes
512 * - re_process_buffer no longer writes the modified buffer
513 * to the client, which was very ugly. It now returns the
514 * buffer, which it is then written by chat.
516 * - content_length now adjusts the Content-Length: header
517 * for modified documents rather than crunch()ing it.
518 * (Length info in csp->content_length, which is 0 for
519 * unmodified documents)
521 * - For this to work, sed() is called twice when filtering.
523 * Revision 1.8 2001/05/26 17:13:28 jongfoster
524 * Filled in a function comment.
526 * Revision 1.7 2001/05/26 15:26:15 jongfoster
527 * ACL feature now provides more security by immediately dropping
528 * connections from untrusted hosts.
530 * Revision 1.6 2001/05/26 00:28:36 jongfoster
531 * Automatic reloading of config file.
532 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
533 * Most of the global variables have been moved to a new
534 * struct configuration_spec, accessed through csp->config->globalname
535 * Most of the globals remaining are used by the Win32 GUI.
537 * Revision 1.5 2001/05/25 22:34:30 jongfoster
540 * Revision 1.4 2001/05/22 18:46:04 oes
542 * - Enabled filtering banners by size rather than URL
543 * by adding patterns that replace all standard banner
544 * sizes with the "Junkbuster" gif to the re_filterfile
546 * - Enabled filtering WebBugs by providing a pattern
547 * which kills all 1x1 images
549 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
550 * which is selected by the (nonstandard and therefore
551 * capital) letter 'U' in the option string.
552 * It causes the quantifiers to be ungreedy by default.
553 * Appending a ? turns back to greedy (!).
555 * - Added a new interceptor ijb-send-banner, which
556 * sends back the "Junkbuster" gif. Without imagelist or
557 * MSIE detection support, or if tinygif = 1, or the
558 * URL isn't recognized as an imageurl, a lame HTML
559 * explanation is sent instead.
561 * - Added new feature, which permits blocking remote
562 * script redirects and firing back a local redirect
564 * The feature is conditionally compiled, i.e. it
565 * can be disabled with --disable-fast-redirects,
566 * plus it must be activated by a "fast-redirects"
567 * line in the config file, has its own log level
568 * and of course wants to be displayed by show-proxy-args
569 * Note: Boy, all the #ifdefs in 1001 locations and
570 * all the fumbling with configure.in and acconfig.h
571 * were *way* more work than the feature itself :-(
573 * - Because a generic redirect template was needed for
574 * this, tinygif = 3 now uses the same.
576 * - Moved GIFs, and other static HTTP response templates
581 * - Removed some >400 CRs again (Jon, you really worked
584 * Revision 1.3 2001/05/20 16:44:47 jongfoster
585 * Removing last hardcoded Junkbusters.com URLs.
587 * Revision 1.2 2001/05/20 01:21:20 jongfoster
588 * Version 2.9.4 checkin.
589 * - Merged popupfile and cookiefile, and added control over PCRS
590 * filtering, in new "permissionsfile".
591 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
592 * file error you now get a message box (in the Win32 GUI) rather
593 * than the program exiting with no explanation.
594 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
596 * - Removed tabs from "config"
597 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
598 * - Bumped up version number.
600 * Revision 1.1.1.1 2001/05/15 13:58:52 oes
601 * Initial import of version 2.9.3 source tree
604 *********************************************************************/
610 #include <sys/types.h>
619 #endif /* ndef __OS2__ */
620 #include <netinet/in.h>
622 #include <winsock2.h>
623 #endif /* ndef _WIN32 */
627 #endif /* def __OS2__ */
635 #include "jbsockets.h"
636 #include "miscutil.h"
640 #include "deanimate.h"
641 #include "urlmatch.h"
648 const char filters_h_rcs[] = FILTERS_H_VERSION;
650 /* Fix a problem with Solaris. There should be no effect on other
652 * Solaris's isspace() is a macro which uses it's argument directly
653 * as an array index. Therefore we need to make sure that high-bit
654 * characters generate +ve values, and ideally we also want to make
655 * the argument match the declared parameter type of "int".
657 #define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
659 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
660 static jb_err prepare_for_filtering(struct client_state *csp);
663 /*********************************************************************
665 * Function : block_acl
667 * Description : Block this request?
668 * Decide yes or no based on ACL file.
671 * 1 : dst = The proxy or gateway address this is going to.
672 * Or NULL to check all possible targets.
673 * 2 : csp = Current client state (buffers, headers, etc...)
674 * Also includes the client IP address.
676 * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
678 *********************************************************************/
679 int block_acl(struct access_control_addr *dst, struct client_state *csp)
681 struct access_control_list *acl = csp->config->acl;
683 /* if not using an access control list, then permit the connection */
689 /* search the list */
692 if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
696 /* Just want to check if they have any access */
697 if (acl->action == ACL_PERMIT)
702 else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
703 && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
705 if (acl->action == ACL_PERMIT)
723 /*********************************************************************
725 * Function : acl_addr
727 * Description : Called from `load_config' to parse an ACL address.
730 * 1 : aspec = String specifying ACL address.
731 * 2 : aca = struct access_control_addr to fill in.
733 * Returns : 0 => Ok, everything else is an error.
735 *********************************************************************/
736 int acl_addr(const char *aspec, struct access_control_addr *aca)
741 char *acl_spec = NULL;
747 * Use a temporary acl spec copy so we can log
748 * the unmodified original in case of parse errors.
750 acl_spec = strdup(aspec);
751 if (acl_spec == NULL)
753 /* XXX: This will be logged as parse error. */
757 if ((p = strchr(acl_spec, '/')) != NULL)
760 if (ijb_isdigit(*p) == 0)
765 masklength = atoi(p);
768 if ((masklength < 0) || (masklength > 32))
774 if ((p = strchr(acl_spec, ':')) != NULL)
779 port = strtol(p, &endptr, 10);
781 if (port <= 0 || port > 65535 || *endptr != '\0')
788 aca->port = (unsigned long)port;
790 aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
793 if (aca->addr == INADDR_NONE)
795 /* XXX: This will be logged as parse error. */
799 /* build the netmask */
801 for (i=1; i <= masklength ; i++)
803 aca->mask |= (1 << (32 - i));
806 /* now mask off the host portion of the ip address
807 * (i.e. save on the network portion of the address).
809 aca->addr = aca->addr & aca->mask;
814 #endif /* def FEATURE_ACL */
817 /*********************************************************************
819 * Function : block_url
821 * Description : Called from `chat'. Check to see if we need to block this.
824 * 1 : csp = Current client state (buffers, headers, etc...)
826 * Returns : NULL => unblocked, else HTTP block response
828 *********************************************************************/
829 struct http_response *block_url(struct client_state *csp)
831 struct http_response *rsp;
832 const char *new_content_type = NULL;
835 * If it's not blocked, don't block it ;-)
837 if ((csp->action->flags & ACTION_BLOCK) == 0)
841 if (csp->action->flags & ACTION_REDIRECT)
843 log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
846 * Else, prepare a response
848 if (NULL == (rsp = alloc_http_response()))
850 return cgi_error_memory();
854 * If it's an image-url, send back an image or redirect
855 * as specified by the relevant +image action
857 #ifdef FEATURE_IMAGE_BLOCKING
858 if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
862 /* determine HOW images should be blocked */
863 p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
865 if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
867 log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
869 #if 1 /* Two alternative strategies, use this one for now: */
871 /* and handle accordingly: */
872 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
874 rsp->status = strdup("403 Request blocked by Privoxy");
875 if (rsp->status == NULL)
877 free_http_response(rsp);
878 return cgi_error_memory();
880 rsp->body = bindup(image_pattern_data, image_pattern_length);
881 if (rsp->body == NULL)
883 free_http_response(rsp);
884 return cgi_error_memory();
886 rsp->content_length = image_pattern_length;
888 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
890 free_http_response(rsp);
891 return cgi_error_memory();
895 else if (0 == strcmpic(p, "blank"))
897 rsp->status = strdup("403 Request blocked by Privoxy");
898 if (rsp->status == NULL)
900 free_http_response(rsp);
901 return cgi_error_memory();
903 rsp->body = bindup(image_blank_data, image_blank_length);
904 if (rsp->body == NULL)
906 free_http_response(rsp);
907 return cgi_error_memory();
909 rsp->content_length = image_blank_length;
911 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
913 free_http_response(rsp);
914 return cgi_error_memory();
920 rsp->status = strdup("302 Local Redirect from Privoxy");
921 if (rsp->status == NULL)
923 free_http_response(rsp);
924 return cgi_error_memory();
927 if (enlist_unique_header(rsp->headers, "Location", p))
929 free_http_response(rsp);
930 return cgi_error_memory();
934 #else /* Following code is disabled for now */
936 /* and handle accordingly: */
937 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
939 p = CGI_PREFIX "send-banner?type=pattern";
941 else if (0 == strcmpic(p, "blank"))
943 p = CGI_PREFIX "send-banner?type=blank";
945 rsp->status = strdup("302 Local Redirect from Privoxy");
946 if (rsp->status == NULL)
948 free_http_response(rsp);
949 return cgi_error_memory();
952 if (enlist_unique_header(rsp->headers, "Location", p))
954 free_http_response(rsp);
955 return cgi_error_memory();
957 #endif /* Preceeding code is disabled for now */
959 else if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
962 * Send empty document.
964 new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
967 rsp->body = strdup(" ");
968 rsp->content_length = 1;
970 rsp->status = strdup("403 Request blocked by Privoxy");
971 if (rsp->status == NULL)
973 free_http_response(rsp);
974 return cgi_error_memory();
976 if (new_content_type != 0)
978 log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
979 if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
981 free_http_response(rsp);
982 return cgi_error_memory();
987 #endif /* def FEATURE_IMAGE_BLOCKING */
990 * Else, generate an HTML "blocked" message:
994 struct map * exports;
998 * Workaround for stupid Netscape bug which prevents
999 * pages from being displayed if loading a referenced
1000 * JavaScript or style sheet fails. So make it appear
1001 * as if it succeeded.
1003 if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
1004 && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
1005 && !strstr(p, "Gecko") /* save Mozilla, */
1006 && !strstr(p, "compatible") /* MSIE */
1007 && !strstr(p, "Opera")) /* and Opera. */
1009 rsp->status = strdup("200 Request for blocked URL");
1013 rsp->status = strdup("403 Request for blocked URL");
1016 if (rsp->status == NULL)
1018 free_http_response(rsp);
1019 return cgi_error_memory();
1022 exports = default_exports(csp, NULL);
1023 if (exports == NULL)
1025 free_http_response(rsp);
1026 return cgi_error_memory();
1029 #ifdef FEATURE_FORCE_LOAD
1030 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1032 * Export the force conditional block killer if
1034 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1035 * - Privoxy is configured to enforce blocks, or
1036 * - it's a CONNECT request and enforcing wouldn't work anyway.
1038 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1039 || (0 == strcmpic(csp->http->gpc, "connect")))
1040 #endif /* ndef FEATURE_FORCE_LOAD */
1042 err = map_block_killer(exports, "force-support");
1045 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1046 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
1047 if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
1048 if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
1053 free_http_response(rsp);
1054 return cgi_error_memory();
1057 err = template_fill_for_cgi(csp, "blocked", exports, rsp);
1060 free_http_response(rsp);
1061 return cgi_error_memory();
1064 rsp->reason = RSP_REASON_BLOCKED;
1066 return finish_http_response(csp, rsp);
1071 #ifdef FEATURE_TRUST
1072 /*********************************************************************
1074 * Function : trust_url FIXME: I should be called distrust_url
1076 * Description : Calls is_untrusted_url to determine if the URL is trusted
1077 * and if not, returns a HTTP 403 response with a reject message.
1080 * 1 : csp = Current client state (buffers, headers, etc...)
1082 * Returns : NULL => trusted, else http_response.
1084 *********************************************************************/
1085 struct http_response *trust_url(struct client_state *csp)
1087 struct http_response *rsp;
1088 struct map * exports;
1089 char buf[BUFFER_SIZE];
1091 struct url_spec **tl;
1096 * Don't bother to work on trusted URLs
1098 if (!is_untrusted_url(csp))
1104 * Else, prepare a response:
1106 if (NULL == (rsp = alloc_http_response()))
1108 return cgi_error_memory();
1111 rsp->status = strdup("403 Request blocked by Privoxy");
1112 exports = default_exports(csp, NULL);
1113 if (exports == NULL || rsp->status == NULL)
1115 free_http_response(rsp);
1116 return cgi_error_memory();
1120 * Export the protocol, host, port, and referrer information
1122 err = map(exports, "hostport", 1, csp->http->hostport, 1);
1123 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1124 if (!err) err = map(exports, "path", 1, csp->http->path, 1);
1126 if (NULL != (p = get_header_value(csp->headers, "Referer:")))
1128 if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
1132 if (!err) err = map(exports, "referrer", 1, "none set", 1);
1138 free_http_response(rsp);
1139 return cgi_error_memory();
1143 * Export the trust list
1146 for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
1148 snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
1149 string_append(&p, buf);
1151 err = map(exports, "trusted-referrers", 1, p, 0);
1156 free_http_response(rsp);
1157 return cgi_error_memory();
1161 * Export the trust info, if available
1163 if (csp->config->trust_info->first)
1165 struct list_entry *l;
1168 for (l = csp->config->trust_info->first; l ; l = l->next)
1170 snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
1171 string_append(&p, buf);
1173 err = map(exports, "trust-info", 1, p, 0);
1177 err = map_block_killer(exports, "have-trust-info");
1183 free_http_response(rsp);
1184 return cgi_error_memory();
1188 * Export the force conditional block killer if
1190 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1191 * - Privoxy is configured to enforce blocks, or
1192 * - it's a CONNECT request and enforcing wouldn't work anyway.
1194 #ifdef FEATURE_FORCE_LOAD
1195 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1196 || (0 == strcmpic(csp->http->gpc, "connect")))
1198 err = map_block_killer(exports, "force-support");
1202 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1204 #else /* ifndef FEATURE_FORCE_LOAD */
1205 err = map_block_killer(exports, "force-support");
1206 #endif /* ndef FEATURE_FORCE_LOAD */
1211 free_http_response(rsp);
1212 return cgi_error_memory();
1216 * Build the response
1218 err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
1221 free_http_response(rsp);
1222 return cgi_error_memory();
1224 rsp->reason = RSP_REASON_UNTRUSTED;
1226 return finish_http_response(csp, rsp);
1228 #endif /* def FEATURE_TRUST */
1231 /*********************************************************************
1233 * Function : compile_dynamic_pcrs_job_list
1235 * Description : Compiles a dynamic pcrs job list (one with variables
1236 * resolved at request time)
1239 * 1 : csp = Current client state (buffers, headers, etc...)
1240 * 2 : b = The filter list to compile
1242 * Returns : NULL in case of errors, otherwise the
1245 *********************************************************************/
1246 pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
1248 struct list_entry *pattern;
1249 pcrs_job *job_list = NULL;
1250 pcrs_job *dummy = NULL;
1251 pcrs_job *lastjob = NULL;
1254 const struct pcrs_variable variables[] =
1256 {"url", csp->http->url, 1},
1257 {"path", csp->http->path, 1},
1258 {"host", csp->http->host, 1},
1259 {"origin", csp->ip_addr_str, 1},
1263 for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
1265 assert(pattern->str != NULL);
1267 dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
1271 log_error(LOG_LEVEL_ERROR,
1272 "Adding filter job \'%s\' to dynamic filter %s failed: %s",
1273 pattern->str, b->name, pcrs_strerror(error));
1278 if (error == PCRS_WARN_TRUNCATION)
1280 log_error(LOG_LEVEL_ERROR,
1281 "At least one of the variables in \'%s\' had to "
1282 "be truncated before compilation", pattern->str);
1284 if (job_list == NULL)
1290 lastjob->next = dummy;
1300 /*********************************************************************
1302 * Function : rewrite_url
1304 * Description : Rewrites a URL with a single pcrs command
1305 * and returns the result if it differs from the
1306 * original and isn't obviously invalid.
1309 * 1 : old_url = URL to rewrite.
1310 * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
1313 * Returns : NULL if the pcrs_command didn't change the url, or
1314 * the result of the modification.
1316 *********************************************************************/
1317 char *rewrite_url(char *old_url, const char *pcrs_command)
1319 char *new_url = NULL;
1323 assert(pcrs_command);
1325 new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
1329 log_error(LOG_LEVEL_REDIRECTS,
1330 "pcrs command \"%s\" didn't change \"%s\".",
1331 pcrs_command, old_url);
1336 log_error(LOG_LEVEL_REDIRECTS,
1337 "executing pcrs command \"%s\" to rewrite %s failed: %s",
1338 pcrs_command, old_url, pcrs_strerror(hits));
1341 else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
1343 log_error(LOG_LEVEL_ERROR,
1344 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
1345 "but the result doesn't look like a valid URL and will be ignored.",
1346 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1351 log_error(LOG_LEVEL_REDIRECTS,
1352 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
1353 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1361 #ifdef FEATURE_FAST_REDIRECTS
1362 /*********************************************************************
1364 * Function : get_last_url
1366 * Description : Search for the last URL inside a string.
1367 * If the string already is a URL, it will
1368 * be the first URL found.
1371 * 1 : subject = the string to check
1372 * 2 : redirect_mode = +fast-redirect{} mode
1374 * Returns : NULL if no URL was found, or
1375 * the last URL found.
1377 *********************************************************************/
1378 char *get_last_url(char *subject, const char *redirect_mode)
1380 char *new_url = NULL;
1384 assert(redirect_mode);
1386 subject = strdup(subject);
1387 if (subject == NULL)
1389 log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
1393 if (0 == strcmpic(redirect_mode, "check-decoded-url"))
1395 log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
1396 new_url = url_decode(subject);
1397 if (new_url != NULL)
1404 log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
1408 log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
1411 * Find the last URL encoded in the request
1414 while ((tmp = strstr(tmp, "http://")) != NULL)
1418 tmp = (new_url != NULL) ? new_url : subject;
1419 while ((tmp = strstr(tmp, "https://")) != NULL)
1424 if ((new_url != NULL)
1425 && ( (new_url != subject)
1426 || (0 == strncmpic(subject, "http://", 7))
1427 || (0 == strncmpic(subject, "https://", 8))
1431 * Return new URL if we found a redirect
1432 * or if the subject already was a URL.
1434 * The second case makes sure that we can
1435 * chain get_last_url after another redirection check
1436 * (like rewrite_url) without losing earlier redirects.
1438 new_url = strdup(new_url);
1447 #endif /* def FEATURE_FAST_REDIRECTS */
1450 /*********************************************************************
1452 * Function : redirect_url
1454 * Description : Checks if Privoxy should answer the request with
1455 * a HTTP redirect and generates the redirect if
1459 * 1 : csp = Current client state (buffers, headers, etc...)
1461 * Returns : NULL if the request can pass, HTTP redirect otherwise.
1463 *********************************************************************/
1464 struct http_response *redirect_url(struct client_state *csp)
1466 struct http_response *rsp;
1467 #ifdef FEATURE_FAST_REDIRECTS
1469 * XXX: Do we still need FEATURE_FAST_REDIRECTS
1470 * as compile-time option? The user can easily disable
1471 * it in his action file.
1473 char * redirect_mode;
1474 #endif /* def FEATURE_FAST_REDIRECTS */
1475 char *old_url = NULL;
1476 char *new_url = NULL;
1477 char *redirection_string;
1479 if ((csp->action->flags & ACTION_REDIRECT))
1481 redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
1484 * If the redirection string begins with 's',
1485 * assume it's a pcrs command, otherwise treat it as
1486 * properly formatted URL and use it for the redirection
1489 * According to RFC 2616 section 14.30 the URL
1490 * has to be absolute and if the user tries:
1491 * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
1492 * she would get undefined results anyway.
1496 if (*redirection_string == 's')
1498 old_url = csp->http->url;
1499 new_url = rewrite_url(old_url, redirection_string);
1503 log_error(LOG_LEVEL_REDIRECTS,
1504 "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
1505 redirection_string);
1506 new_url = strdup(redirection_string);
1510 #ifdef FEATURE_FAST_REDIRECTS
1511 if ((csp->action->flags & ACTION_FAST_REDIRECTS))
1513 redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
1516 * If it exists, use the previously rewritten URL as input
1517 * otherwise just use the old path.
1519 old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
1520 new_url = get_last_url(old_url, redirect_mode);
1525 * Disable redirect checkers, so that they
1526 * will be only run more than once if the user
1527 * also enables them through tags.
1529 * From a performance point of view
1530 * it doesn't matter, but the duplicated
1531 * log messages are annoying.
1533 csp->action->flags &= ~ACTION_FAST_REDIRECTS;
1534 #endif /* def FEATURE_FAST_REDIRECTS */
1535 csp->action->flags &= ~ACTION_REDIRECT;
1537 /* Did any redirect action trigger? */
1540 if (0 == strcmpic(new_url, csp->http->url))
1542 log_error(LOG_LEVEL_ERROR,
1543 "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
1544 csp->http->url, new_url);
1549 log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
1551 if (NULL == (rsp = alloc_http_response()))
1554 return cgi_error_memory();
1557 if ( enlist_unique_header(rsp->headers, "Location", new_url)
1558 || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
1561 free_http_response(rsp);
1562 return cgi_error_memory();
1564 rsp->reason = RSP_REASON_REDIRECTED;
1567 return finish_http_response(csp, rsp);
1571 /* Only reached if no redirect is required */
1577 #ifdef FEATURE_IMAGE_BLOCKING
1578 /*********************************************************************
1580 * Function : is_imageurl
1582 * Description : Given a URL, decide whether it is an image or not,
1583 * using either the info from a previous +image action
1584 * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
1585 * is MSIE and not on a Mac, tell from the browser's accept
1589 * 1 : csp = Current client state (buffers, headers, etc...)
1591 * Returns : True (nonzero) if URL is an image, false (0)
1594 *********************************************************************/
1595 int is_imageurl(const struct client_state *csp)
1597 #ifdef FEATURE_IMAGE_DETECT_MSIE
1600 tmp = get_header_value(csp->headers, "User-Agent:");
1601 if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
1603 tmp = get_header_value(csp->headers, "Accept:");
1604 if (tmp && strstr(tmp, "image/gif"))
1606 /* Client will accept HTML. If this seems counterintuitive,
1616 #endif /* def FEATURE_IMAGE_DETECT_MSIE */
1618 return ((csp->action->flags & ACTION_IMAGE) != 0);
1621 #endif /* def FEATURE_IMAGE_BLOCKING */
1624 #ifdef FEATURE_TRUST
1625 /*********************************************************************
1627 * Function : is_untrusted_url
1629 * Description : Should we "distrust" this URL (and block it)?
1631 * Yes if it matches a line in the trustfile, or if the
1632 * referrer matches a line starting with "+" in the
1637 * 1 : csp = Current client state (buffers, headers, etc...)
1639 * Returns : 0 => trusted, 1 => untrusted
1641 *********************************************************************/
1642 int is_untrusted_url(const struct client_state *csp)
1644 struct file_list *fl;
1645 struct block_spec *b;
1646 struct url_spec **trusted_url;
1647 struct http_request rhttp[1];
1648 const char * referer;
1652 * If we don't have a trustlist, we trust everybody
1654 if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
1659 memset(rhttp, '\0', sizeof(*rhttp));
1662 * Do we trust the request URL itself?
1664 for (b = b->next; b ; b = b->next)
1666 if (url_match(b->url, csp->http))
1672 if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
1674 /* no referrer was supplied */
1680 * If not, do we maybe trust its referrer?
1682 err = parse_http_url(referer, rhttp, csp);
1688 for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
1690 if (url_match(*trusted_url, rhttp))
1692 /* if the URL's referrer is from a trusted referrer, then
1693 * add the target spec to the trustfile as an unblocked
1694 * domain and return 0 (which means it's OK).
1699 if (NULL != (fp = fopen(csp->config->trustfile, "a")))
1703 char * new_entry = strdup("~");
1705 string_append(&new_entry, csp->http->hostport);
1707 path = csp->http->path;
1708 if ( (path[0] == '/')
1710 && ((path_end = strchr(path + 2, '/')) != NULL))
1712 /* since this path points into a user's home space
1713 * be sure to include this spec in the trustfile.
1715 int path_len = path_end - path; /* save offset */
1716 path = strdup(path); /* Copy string */
1719 path_end = path + path_len; /* regenerate ptr to new buffer */
1720 *(path_end + 1) = '\0'; /* Truncate path after '/' */
1722 string_join(&new_entry, path);
1726 * Give a reason for generating this entry.
1728 string_append(&new_entry, " # Trusted referrer was: ");
1729 string_append(&new_entry, referer);
1731 if (new_entry != NULL)
1733 if (-1 == fprintf(fp, "%s\n", new_entry))
1735 log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
1736 new_entry, csp->config->trustfile);
1742 /* FIXME: No way to handle out-of memory, so mostly ignoring it */
1743 log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
1750 log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
1751 csp->http->hostport, csp->config->trustfile);
1759 #endif /* def FEATURE_TRUST */
1762 /*********************************************************************
1764 * Function : pcrs_filter_response
1766 * Description : Execute all text substitutions from all applying
1767 * +filter actions on the text buffer that's been
1768 * accumulated in csp->iob->buf.
1771 * 1 : csp = Current client state (buffers, headers, etc...)
1773 * Returns : a pointer to the (newly allocated) modified buffer.
1774 * or NULL if there were no hits or something went wrong
1776 *********************************************************************/
1777 static char *pcrs_filter_response(struct client_state *csp)
1780 size_t size, prev_size;
1786 struct file_list *fl;
1787 struct re_filterfile_spec *b;
1788 struct list_entry *filtername;
1790 int i, found_filters = 0;
1795 if (csp->iob->cur >= csp->iob->eod)
1801 * Need to check the set of re_filterfiles...
1803 for (i = 0; i < MAX_AF_FILES; i++)
1816 if (0 == found_filters)
1818 log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
1819 "content filtering enabled, but no content filters available.");
1823 size = (size_t)(csp->iob->eod - csp->iob->cur);
1824 old = csp->iob->cur;
1826 for (i = 0; i < MAX_AF_FILES; i++)
1829 if ((NULL == fl) || (NULL == fl->f))
1832 * Either there are no filter files
1833 * left, or this filter file just
1834 * contains no valid filters.
1836 * Continue to be sure we don't miss
1837 * valid filter files that are chained
1838 * after empty or invalid ones.
1843 * For all applying +filter actions, look if a filter by that
1844 * name exists and if yes, execute it's pcrs_joblist on the
1847 for (b = fl->f; b; b = b->next)
1849 if (b->type != FT_CONTENT_FILTER)
1851 /* Skip header filters */
1855 for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
1856 filtername ; filtername = filtername->next)
1858 if (strcmp(b->name, filtername->str) == 0)
1860 int current_hits = 0; /* Number of hits caused by this filter */
1861 int job_number = 0; /* Which job we're currently executing */
1862 int job_hits = 0; /* How many hits the current job caused */
1863 pcrs_job *joblist = b->joblist;
1865 if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
1867 if (NULL == joblist)
1869 log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
1874 /* Apply all jobs from the joblist */
1875 for (job = joblist; NULL != job; job = job->next)
1878 job_hits = pcrs_execute(job, old, size, &new, &size);
1883 * That went well. Continue filtering
1884 * and use the result of this job as
1885 * input for the next one.
1887 current_hits += job_hits;
1888 if (old != csp->iob->cur)
1897 * This job caused an unexpected error. Inform the user
1898 * and skip the rest of the jobs in this filter. We could
1899 * continue with the next job, but usually the jobs
1900 * depend on each other or are similar enough to
1901 * fail for the same reason.
1903 * At the moment our pcrs expects the error codes of pcre 3.4,
1904 * but newer pcre versions can return additional error codes.
1905 * As a result pcrs_strerror()'s error message might be
1906 * "Unknown error ...", therefore we print the numerical value
1909 * XXX: Is this important enough for LOG_LEVEL_ERROR or
1910 * should we use LOG_LEVEL_RE_FILTER instead?
1912 log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
1913 b->name, job_number, pcrs_strerror(job_hits), job_hits);
1918 if (b->dynamic) pcrs_free_joblist(joblist);
1920 log_error(LOG_LEVEL_RE_FILTER,
1921 "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
1922 csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
1924 hits += current_hits;
1931 * If there were no hits, destroy our copy and let
1932 * chat() use the original in csp->iob
1940 csp->flags |= CSP_FLAG_MODIFIED;
1941 csp->content_length = size;
1949 /*********************************************************************
1951 * Function : gif_deanimate_response
1953 * Description : Deanimate the GIF image that has been accumulated in
1954 * csp->iob->buf, set csp->content_length to the modified
1955 * size and raise the CSP_FLAG_MODIFIED flag.
1958 * 1 : csp = Current client state (buffers, headers, etc...)
1960 * Returns : a pointer to the (newly allocated) modified buffer.
1961 * or NULL in case something went wrong.
1963 *********************************************************************/
1964 static char *gif_deanimate_response(struct client_state *csp)
1966 struct binbuffer *in, *out;
1970 size = (size_t)(csp->iob->eod - csp->iob->cur);
1972 if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
1973 || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
1975 log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
1979 in->buffer = csp->iob->cur;
1982 if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
1984 log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
1991 if ((int)size == out->offset)
1993 log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
1997 log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
1999 csp->content_length = out->offset;
2000 csp->flags |= CSP_FLAG_MODIFIED;
2010 /*********************************************************************
2012 * Function : jpeg_inspect_response
2017 * 1 : csp = Current client state (buffers, headers, etc...)
2019 * Returns : a pointer to the (newly allocated) modified buffer
2020 * or NULL in case something went wrong.
2022 *********************************************************************/
2023 static char *jpeg_inspect_response(struct client_state *csp)
2025 struct binbuffer *in = NULL;
2026 struct binbuffer *out = NULL;
2030 size = (size_t)(csp->iob->eod - csp->iob->cur);
2032 if (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
2034 log_error(LOG_LEVEL_DEANIMATE, "failed! (jpeg no mem 1)");
2038 if (NULL == (out = (struct binbuffer *)zalloc(sizeof *out)))
2040 log_error(LOG_LEVEL_DEANIMATE, "failed! (jpeg no mem 2)");
2044 in->buffer = csp->iob->cur;
2048 * Calling jpeg_inspect has the side-effect of creating and
2049 * modifying the image buffer of "out" directly.
2051 if (jpeg_inspect(in, out))
2053 log_error(LOG_LEVEL_DEANIMATE, "failed! (jpeg parsing)");
2061 csp->content_length = out->offset;
2062 csp->flags |= CSP_FLAG_MODIFIED;
2072 /*********************************************************************
2074 * Function : get_filter_function
2076 * Description : Decides which content filter function has
2077 * to be applied (if any).
2079 * XXX: Doesn't handle filter_popups()
2080 * because of the different prototype. Probably
2081 * we should ditch filter_popups() anyway, it's
2082 * even less reliable than popup blocking based
2086 * 1 : csp = Current client state (buffers, headers, etc...)
2088 * Returns : The content filter function to run, or
2089 * NULL if no content filter is active
2091 *********************************************************************/
2092 filter_function_ptr get_filter_function(struct client_state *csp)
2094 filter_function_ptr filter_function = NULL;
2097 * Are we enabling text mode by force?
2099 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
2102 * Do we really have to?
2104 if (csp->content_type & CT_TEXT)
2106 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
2110 csp->content_type |= CT_TEXT;
2111 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
2115 if (!(csp->content_type & CT_DECLARED))
2118 * The server didn't bother to declare a MIME-Type.
2119 * Assume it's text that can be filtered.
2121 * This also regulary happens with 304 responses,
2122 * therefore logging anything here would cause
2125 csp->content_type |= CT_TEXT;
2129 * Choose the applying filter function based on
2130 * the content type and action settings.
2132 if ((csp->content_type & CT_TEXT) &&
2133 (csp->rlist != NULL) &&
2134 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
2136 filter_function = pcrs_filter_response;
2138 else if ((csp->content_type & CT_GIF) &&
2139 (csp->action->flags & ACTION_DEANIMATE))
2141 filter_function = gif_deanimate_response;
2143 else if ((csp->content_type & CT_JPEG) &&
2144 (csp->action->flags & ACTION_JPEG_INSPECT))
2146 filter_function = jpeg_inspect_response;
2149 return filter_function;
2153 /*********************************************************************
2155 * Function : remove_chunked_transfer_coding
2157 * Description : In-situ remove the "chunked" transfer coding as defined
2158 * in rfc2616 from a buffer.
2161 * 1 : buffer = Pointer to the text buffer
2162 * 2 : size = In: Number of bytes to be processed,
2163 * Out: Number of bytes after de-chunking.
2164 * (undefined in case of errors)
2166 * Returns : JB_ERR_OK for success,
2167 * JB_ERR_PARSE otherwise
2169 *********************************************************************/
2170 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
2173 unsigned int chunksize = 0;
2174 char *from_p, *to_p;
2177 from_p = to_p = buffer;
2179 if (sscanf(buffer, "%x", &chunksize) != 1)
2181 log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
2182 return JB_ERR_PARSE;
2185 while (chunksize > 0)
2187 if (NULL == (from_p = strstr(from_p, "\r\n")))
2189 log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
2190 return JB_ERR_PARSE;
2193 if ((newsize += chunksize) >= *size)
2195 log_error(LOG_LEVEL_ERROR, "Chunksize exceeds buffer in \"chunked\" transfer coding");
2196 return JB_ERR_PARSE;
2200 memmove(to_p, from_p, (size_t) chunksize);
2201 to_p = buffer + newsize;
2202 from_p += chunksize + 2;
2204 if (sscanf(from_p, "%x", &chunksize) != 1)
2206 log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
2211 /* XXX: Should get its own loglevel. */
2212 log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
2221 /*********************************************************************
2223 * Function : prepare_for_filtering
2225 * Description : If necessary, de-chunks and decompresses
2226 * the content so it can get filterd.
2229 * 1 : csp = Current client state (buffers, headers, etc...)
2231 * Returns : JB_ERR_OK for success,
2232 * JB_ERR_PARSE otherwise
2234 *********************************************************************/
2235 static jb_err prepare_for_filtering(struct client_state *csp)
2237 jb_err err = JB_ERR_OK;
2240 * If the body has a "chunked" transfer-encoding,
2241 * get rid of it, adjusting size and iob->eod
2243 if (csp->flags & CSP_FLAG_CHUNKED)
2245 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
2247 log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
2248 err = remove_chunked_transfer_coding(csp->iob->cur, &size);
2249 if (JB_ERR_OK == err)
2251 csp->iob->eod = csp->iob->cur + size;
2252 csp->flags |= CSP_FLAG_MODIFIED;
2256 return JB_ERR_PARSE;
2262 * If the body has a supported transfer-encoding,
2263 * decompress it, adjusting size and iob->eod.
2265 if (csp->content_type & (CT_GZIP|CT_DEFLATE))
2267 if (0 == csp->iob->eod - csp->iob->cur)
2269 /* Nothing left after de-chunking. */
2273 err = decompress_iob(csp);
2275 if (JB_ERR_OK == err)
2277 csp->flags |= CSP_FLAG_MODIFIED;
2278 csp->content_type &= ~CT_TABOO;
2283 * Unset CT_GZIP and CT_DEFLATE to remember not
2284 * to modify the Content-Encoding header later.
2286 csp->content_type &= ~CT_GZIP;
2287 csp->content_type &= ~CT_DEFLATE;
2296 /*********************************************************************
2298 * Function : execute_content_filter
2300 * Description : Executes a given content filter.
2303 * 1 : csp = Current client state (buffers, headers, etc...)
2304 * 2 : content_filter = The filter function to execute
2306 * Returns : Pointer to the modified buffer, or
2307 * NULL if filtering failed or wasn't necessary.
2309 *********************************************************************/
2310 char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
2312 if (0 == csp->iob->eod - csp->iob->cur)
2315 * No content (probably status code 301, 302 ...),
2316 * no filtering necessary.
2321 if (JB_ERR_OK != prepare_for_filtering(csp))
2324 * failed to de-chunk or decompress.
2329 if (0 == csp->iob->eod - csp->iob->cur)
2332 * Clown alarm: chunked and/or compressed nothing delivered.
2337 return ((*content_filter)(csp));
2341 /*********************************************************************
2343 * Function : url_actions
2345 * Description : Gets the actions for this URL.
2348 * 1 : http = http_request request for blocked URLs
2349 * 2 : csp = Current client state (buffers, headers, etc...)
2353 *********************************************************************/
2354 void url_actions(struct http_request *http,
2355 struct client_state *csp)
2357 struct file_list *fl;
2358 struct url_actions *b;
2361 init_current_action(csp->action);
2363 for (i = 0; i < MAX_AF_FILES; i++)
2365 if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
2370 apply_url_actions(csp->action, http, b);
2377 /*********************************************************************
2379 * Function : apply_url_actions
2381 * Description : Applies a list of URL actions.
2384 * 1 : action = Destination.
2385 * 2 : http = Current URL
2386 * 3 : b = list of URL actions to apply
2390 *********************************************************************/
2391 void apply_url_actions(struct current_action_spec *action,
2392 struct http_request *http,
2393 struct url_actions *b)
2397 /* Should never happen */
2401 for (b = b->next; NULL != b; b = b->next)
2403 if (url_match(b->url, http))
2405 merge_current_action(action, b->action);
2411 /*********************************************************************
2413 * Function : get_forward_override_settings
2415 * Description : Returns forward settings as specified with the
2416 * forward-override{} action. forward-override accepts
2417 * forward lines similar to the one used in the
2418 * configuration file, but without the URL pattern.
2424 * in the configuration file can be replaced with
2425 * the action section:
2427 * {+forward-override{forward .}}
2431 * 1 : csp = Current client state (buffers, headers, etc...)
2433 * Returns : Pointer to forwarding structure in case of success.
2434 * Invalid syntax is fatal.
2436 *********************************************************************/
2437 const static struct forward_spec *get_forward_override_settings(struct client_state *csp)
2439 const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
2440 char forward_settings[BUFFER_SIZE];
2441 char *http_parent = NULL;
2442 /* variable names were chosen for consistency reasons. */
2443 struct forward_spec *fwd = NULL;
2447 assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
2448 /* Should be enforced by load_one_actions_file() */
2449 assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
2451 /* Create a copy ssplit can modify */
2452 strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
2454 if (NULL != csp->fwd)
2457 * XXX: Currently necessary to prevent memory
2458 * leaks when the show-url-info cgi page is visited.
2460 unload_forward_spec(csp->fwd);
2464 * allocate a new forward node, valid only for
2465 * the lifetime of this request. Save its location
2466 * in csp as well, so sweep() can free it later on.
2468 fwd = csp->fwd = zalloc(sizeof(*fwd));
2471 log_error(LOG_LEVEL_FATAL,
2472 "can't allocate memory for forward-override{%s}", forward_override_line);
2473 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2476 vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
2477 if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
2479 fwd->type = SOCKS_NONE;
2481 /* Parse the parent HTTP proxy host:port */
2482 http_parent = vec[1];
2485 else if (vec_count == 3)
2487 char *socks_proxy = NULL;
2489 if (!strcasecmp(vec[0], "forward-socks4"))
2491 fwd->type = SOCKS_4;
2492 socks_proxy = vec[1];
2494 else if (!strcasecmp(vec[0], "forward-socks4a"))
2496 fwd->type = SOCKS_4A;
2497 socks_proxy = vec[1];
2499 else if (!strcasecmp(vec[0], "forward-socks5"))
2501 fwd->type = SOCKS_5;
2502 socks_proxy = vec[1];
2505 if (NULL != socks_proxy)
2507 /* Parse the SOCKS proxy host[:port] */
2508 fwd->gateway_host = strdup(socks_proxy);
2510 if (NULL != (socks_proxy = strchr(fwd->gateway_host, ':')))
2512 *socks_proxy++ = '\0';
2513 fwd->gateway_port = strtol(socks_proxy, NULL, 0);
2516 if (fwd->gateway_port <= 0)
2518 fwd->gateway_port = 1080;
2521 http_parent = vec[2];
2525 if (NULL == http_parent)
2527 log_error(LOG_LEVEL_FATAL,
2528 "Invalid forward-override syntax in: %s", forward_override_line);
2529 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2532 /* Parse http forwarding settings */
2533 if (strcmp(http_parent, ".") != 0)
2535 fwd->forward_host = strdup(http_parent);
2537 if (NULL != (http_parent = strchr(fwd->forward_host, ':')))
2539 *http_parent++ = '\0';
2540 fwd->forward_port = strtol(http_parent, NULL, 0);
2543 if (fwd->forward_port <= 0)
2545 fwd->forward_port = 8000;
2549 assert (NULL != fwd);
2551 log_error(LOG_LEVEL_CONNECT,
2552 "Overriding forwarding settings based on \'%s\'", forward_override_line);
2558 /*********************************************************************
2560 * Function : forward_url
2562 * Description : Should we forward this to another proxy?
2565 * 1 : csp = Current client state (buffers, headers, etc...)
2566 * 2 : http = http_request request for current URL
2568 * Returns : Pointer to forwarding information.
2570 *********************************************************************/
2571 const struct forward_spec *forward_url(struct client_state *csp,
2572 const struct http_request *http)
2574 static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
2575 struct forward_spec *fwd = csp->config->forward;
2577 if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
2579 return get_forward_override_settings(csp);
2589 if (url_match(fwd->url, http))
2600 /*********************************************************************
2602 * Function : direct_response
2604 * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
2605 * request and if so, return a HTTP 501 to the client.
2607 * FIXME: I have a stupid name and I should handle the
2608 * requests properly. Still, what we do here is rfc-
2609 * compliant, whereas ignoring or forwarding are not.
2612 * 1 : csp = Current client state (buffers, headers, etc...)
2614 * Returns : http_response if , NULL if nonmatch or handler fail
2616 *********************************************************************/
2617 struct http_response *direct_response(struct client_state *csp)
2619 struct http_response *rsp;
2620 struct list_entry *p;
2622 if ((0 == strcmpic(csp->http->gpc, "trace"))
2623 || (0 == strcmpic(csp->http->gpc, "options")))
2625 for (p = csp->headers->first; (p != NULL) ; p = p->next)
2627 if (!strncmpic("Max-Forwards:", p->str, 13))
2629 unsigned int max_forwards;
2632 * If it's a Max-Forwards value of zero,
2633 * we have to intercept the request.
2635 if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
2638 * FIXME: We could handle at least TRACE here,
2639 * but that would require a verbatim copy of
2640 * the request which we don't have anymore
2642 log_error(LOG_LEVEL_HEADER,
2643 "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
2646 /* Get mem for response or fail*/
2647 if (NULL == (rsp = alloc_http_response()))
2649 return cgi_error_memory();
2652 if (NULL == (rsp->status = strdup("501 Not Implemented")))
2654 free_http_response(rsp);
2655 return cgi_error_memory();
2659 rsp->reason = RSP_REASON_UNSUPPORTED;
2661 return(finish_http_response(csp, rsp));
2670 /*********************************************************************
2672 * Function : content_filters_enabled
2674 * Description : Checks whether there are any content filters
2675 * enabled for the current request.
2678 * 1 : csp = Current client state (buffers, headers, etc...)
2680 * Returns : TRUE for yes, FALSE otherwise
2682 *********************************************************************/
2683 inline int content_filters_enabled(const struct client_state *csp)
2685 return (((csp->rlist != NULL) &&
2686 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER]))) ||
2687 (csp->action->flags & (ACTION_DEANIMATE|ACTION_JPEG_INSPECT|ACTION_NO_POPUPS)));