1 const char filters_rcs[] = "$Id: filters.c,v 1.105 2008/03/28 15:13:39 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 * `execute_single_pcrs_command', `rewrite_url',
16 * Copyright : Written by and Copyright (C) 2001, 2004-2008 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 1.105 2008/03/28 15:13:39 fabiankeil
44 * Remove inspect-jpegs action.
46 * Revision 1.104 2008/03/27 18:27:24 fabiankeil
47 * Remove kill-popups action.
49 * Revision 1.103 2008/03/06 16:33:45 fabiankeil
50 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
52 * Revision 1.102 2008/03/01 14:00:44 fabiankeil
53 * Let the block action take the reason for the block
54 * as argument and show it on the "blocked" page.
56 * Revision 1.101 2008/02/23 16:57:12 fabiankeil
57 * Rename url_actions() to get_url_actions() and let it
58 * use the standard parameter ordering.
60 * Revision 1.100 2008/02/23 16:33:43 fabiankeil
61 * Let forward_url() use the standard parameter ordering
62 * and mark its second parameter immutable.
64 * Revision 1.99 2008/02/03 13:57:58 fabiankeil
65 * Add SOCKS5 support for forward-override{}.
67 * Revision 1.98 2008/01/04 17:43:45 fabiankeil
68 * Improve the warning messages that get logged if the action files
69 * "enable" filters but no filters of that type have been loaded.
71 * Revision 1.97 2007/11/30 15:37:03 fabiankeil
72 * Use freez instead of free.
74 * Revision 1.96 2007/10/19 16:53:28 fabiankeil
75 * Add helper function to check if any content filters are enabled.
77 * Revision 1.95 2007/10/17 19:31:20 fabiankeil
78 * Omitting the zero chunk that ends the chunk transfer encoding seems
79 * to be the new black. Log the problem and continue filtering anyway.
81 * Revision 1.94 2007/09/29 13:20:20 fabiankeil
82 * Remove two redundant and one useless log messages.
84 * Revision 1.93 2007/09/29 10:21:16 fabiankeil
85 * - Move get_filter_function() from jcc.c to filters.c
86 * so the filter functions can be static.
87 * - Don't bother filtering body-less responses.
89 * Revision 1.92 2007/09/28 16:38:55 fabiankeil
90 * - Execute content filters through execute_content_filter().
91 * - Add prepare_for_filtering() so filter functions don't have to
92 * care about de-chunking and decompression. As a side effect this enables
93 * decompression for gif_deanimate_response() and jpeg_inspect_response().
94 * - Change remove_chunked_transfer_coding()'s return type to jb_err.
95 * Some clowns feel like chunking empty responses in which case
96 * (size == 0) is valid but previously would be interpreted as error.
98 * Revision 1.91 2007/09/02 15:31:20 fabiankeil
99 * Move match_portlist() from filter.c to urlmatch.c.
100 * It's used for url matching, not for filtering.
102 * Revision 1.90 2007/09/02 12:44:17 fabiankeil
103 * Remove newline at the end of a log_error() message.
105 * Revision 1.89 2007/08/05 13:42:23 fabiankeil
106 * #1763173 from Stefan Huehner: declare some more functions static.
108 * Revision 1.88 2007/06/01 16:41:11 fabiankeil
109 * Add forward-override{} to change the forwarding settings through
110 * action sections. This is mainly interesting to forward different
111 * clients differently (for example based on User-Agent or request
114 * Revision 1.87 2007/04/30 15:53:10 fabiankeil
115 * Make sure filters with dynamic jobs actually use them.
117 * Revision 1.86 2007/04/30 15:03:28 fabiankeil
118 * - Introduce dynamic pcrs jobs that can resolve variables.
119 * - Don't run redirect functions more than once,
120 * unless they are activated more than once.
122 * Revision 1.85 2007/03/21 12:24:47 fabiankeil
123 * - Log the content size after decompression in decompress_iob()
124 * instead of pcrs_filter_response().
126 * Revision 1.84 2007/03/20 15:16:34 fabiankeil
127 * Use dedicated header filter actions instead of abusing "filter".
128 * Replace "filter-client-headers" and "filter-client-headers"
129 * with "server-header-filter" and "client-header-filter".
131 * Revision 1.83 2007/03/17 15:20:05 fabiankeil
132 * New config option: enforce-blocks.
134 * Revision 1.82 2007/03/13 11:28:43 fabiankeil
135 * - Fix port handling in acl_addr() and use a temporary acl spec
136 * copy so error messages don't contain a truncated version.
137 * - Log size of iob before and after decompression.
139 * Revision 1.81 2007/03/05 14:40:53 fabiankeil
140 * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
141 * - Hide the "Go there anyway" link for blocked CONNECT
142 * requests where going there anyway doesn't work anyway.
144 * Revision 1.80 2007/02/07 10:55:20 fabiankeil
145 * - Save the reason for generating http_responses.
146 * - Block (+block) with status code 403 instead of 404.
147 * - Use a different kludge to remember a failed decompression.
149 * Revision 1.79 2007/01/31 16:21:38 fabiankeil
150 * Search for Max-Forwards headers case-insensitive,
151 * don't generate the "501 unsupported" message for invalid
152 * Max-Forwards values and don't increase negative ones.
154 * Revision 1.78 2007/01/28 13:41:18 fabiankeil
155 * - Add HEAD support to finish_http_response.
156 * - Add error favicon to internal HTML error messages.
158 * Revision 1.77 2007/01/12 15:36:44 fabiankeil
159 * Mark *csp as immutable for is_untrusted_url()
160 * and is_imageurl(). Closes FR 1237736.
162 * Revision 1.76 2007/01/01 19:36:37 fabiankeil
163 * Integrate a modified version of Wil Mahan's
164 * zlib patch (PR #895531).
166 * Revision 1.75 2006/12/29 18:30:46 fabiankeil
167 * Fixed gcc43 conversion warnings,
168 * changed sprintf calls to snprintf.
170 * Revision 1.74 2006/12/24 17:37:38 fabiankeil
171 * Adjust comment in pcrs_filter_response()
172 * to recent pcrs changes. Hohoho.
174 * Revision 1.73 2006/12/23 16:01:02 fabiankeil
175 * Don't crash if pcre returns an error code
176 * that pcrs didn't expect. Fixes BR 1621173.
178 * Revision 1.72 2006/12/22 18:52:53 fabiankeil
179 * Modified is_untrusted_url to complain in case of
180 * write errors and to give a reason when adding new
181 * entries to the trustfile. Closes FR 1097611.
183 * Revision 1.71 2006/12/22 14:24:52 fabiankeil
184 * Skip empty filter files in pcrs_filter_response,
185 * but don't ignore the ones that come afterwards.
186 * Fixes parts of BR 1619208.
188 * Revision 1.70 2006/12/09 13:33:15 fabiankeil
189 * Added some sanity checks for get_last_url().
190 * Fixed possible segfault caused by my last commit.
192 * Revision 1.69 2006/12/08 12:39:13 fabiankeil
193 * Let get_last_url() catch https URLs as well.
195 * Revision 1.68 2006/12/05 14:45:48 fabiankeil
196 * Make sure get_last_url() behaves like advertised
197 * and fast-redirects{} can be combined with redirect{}.
199 * Revision 1.67 2006/11/28 15:19:43 fabiankeil
200 * Implemented +redirect{s@foo@bar@} to generate
201 * a redirect based on a rewritten version of the
204 * Revision 1.66 2006/09/23 13:26:38 roro
205 * Replace TABs by spaces in source code.
207 * Revision 1.65 2006/09/21 12:54:43 fabiankeil
208 * Fix +redirect{}. Didn't work with -fast-redirects.
210 * Revision 1.64 2006/08/31 10:55:49 fabiankeil
211 * Block requests for untrusted URLs with status
212 * code 403 instead of 200.
214 * Revision 1.63 2006/08/31 10:11:28 fabiankeil
215 * Don't free p which is still in use and will be later
216 * freed by free_map(). Don't claim the referrer is unknown
217 * when the client didn't set one.
219 * Revision 1.62 2006/08/14 00:27:47 david__schmidt
220 * Feature request 595948: Re-Filter logging in single line
222 * Revision 1.61 2006/08/03 02:46:41 david__schmidt
223 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
225 * Revision 1.60 2006/07/18 14:48:46 david__schmidt
226 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
227 * with what was really the latest development (the v_3_0_branch branch)
229 * Revision 1.58.2.9 2006/01/29 23:10:56 david__schmidt
230 * Multiple filter file support
232 * Revision 1.58.2.8 2005/05/07 21:50:55 david__schmidt
233 * A few memory leaks plugged (mostly on error paths)
235 * Revision 1.58.2.7 2004/10/03 12:53:32 david__schmidt
236 * Add the ability to check jpeg images for invalid
237 * lengths of comment blocks. Defensive strategy
238 * against the exploit:
239 * Microsoft Security Bulletin MS04-028
240 * Buffer Overrun in JPEG Processing (GDI+) Could
241 * Allow Code Execution (833987)
242 * Enabled with +inspect-jpegs in actions files.
244 * Revision 1.58.2.6 2003/12/06 22:18:27 gliptak
245 * Correcting compile problem with FEATURE_IMAGE_BLOCKING
247 * Revision 1.58.2.5 2003/11/11 13:10:31 oes
248 * Fixed bug #839859: "See why" link URL now gets url-encoded.
250 * Revision 1.58.2.4 2003/02/28 12:52:45 oes
253 * Revision 1.58.2.3 2002/09/25 14:51:51 oes
254 * Added basic support for OPTIONS and TRACE HTTP methods:
255 * New function direct_response which handles OPTIONS and
256 * TRACE requests whose Max-Forwards header field is zero.
258 * Revision 1.58.2.2 2002/08/01 17:18:28 oes
259 * Fixed BR 537651 / SR 579724 (MSIE image detect improper for IE/Mac)
261 * Revision 1.58.2.1 2002/07/26 15:18:53 oes
262 * - Bugfix: Executing a filters without jobs no longer results in
263 * turing off *all* filters.
264 * - Security fix: Malicious web servers can't cause a seg fault
265 * through bogus chunk sizes anymore
267 * Revision 1.58 2002/04/24 02:11:17 oes
268 * Jon's multiple AF patch: url_actions now evaluates rules
271 * Revision 1.57 2002/04/08 20:38:34 swa
274 * Revision 1.56 2002/04/05 15:51:24 oes
275 * - bugfix: error-pages now get correct request protocol
276 * - fix for invalid HTML in trust info
278 * Revision 1.55 2002/04/02 16:13:51 oes
279 * Fix: No "Go there anyway" for SSL
281 * Revision 1.54 2002/04/02 14:55:56 oes
282 * Bugfix: is_untrusted_url() now depends on FEATURE_TRUST, not FEATURE_COOKIE_JAR
284 * Revision 1.53 2002/03/26 22:29:54 swa
285 * we have a new homepage!
287 * Revision 1.52 2002/03/24 16:35:57 jongfoster
290 * Revision 1.51 2002/03/24 15:23:33 jongfoster
293 * Revision 1.50 2002/03/24 13:25:43 swa
294 * name change related issues
296 * Revision 1.49 2002/03/16 20:29:14 oes
299 * Revision 1.48 2002/03/13 20:25:34 oes
300 * Better logging for content filters
302 * Revision 1.47 2002/03/13 00:30:52 jongfoster
304 * Added option of always sending redirect for imageblock,
305 * currently disabled with #if 0.
307 * Revision 1.46 2002/03/12 01:42:49 oes
308 * Introduced modular filters
310 * Revision 1.45 2002/03/08 16:47:50 oes
311 * Added choice beween GIF and PNG built-in images
313 * Revision 1.44 2002/03/07 03:49:31 oes
314 * - Fixed compiler warnings etc
315 * - Changed built-in images from GIF to PNG
316 * (with regard to Unisys patent issue)
317 * - Added a 4x4 pattern PNG which is less intrusive
318 * than the logo but also clearly marks the deleted banners
320 * Revision 1.43 2002/01/22 23:51:59 jongfoster
321 * Replacing strsav() with the safer string_append().
323 * Adding missing html_encode() to error message generators. Where encoded
324 * and unencoded versions of a string were provided, removing the unencoded
327 * Revision 1.42 2002/01/17 21:00:32 jongfoster
328 * Moving all our URL and URL pattern parsing code to urlmatch.c.
330 * Using a single, simple url_match(pattern,url) function - rather than
331 * the 3-line match routine which was repeated all over the place.
333 * Renaming free_url to free_url_spec, since it frees a struct url_spec.
335 * Using parse_http_url() to parse URLs without faking a HTTP
336 * request line for parse_http_request().
338 * Revision 1.41 2001/11/13 00:14:07 jongfoster
339 * Fixing stupid bug now I've figured out what || means.
340 * (It always returns 0 or 1, not one of it's paramaters.)
342 * Revision 1.40 2001/10/26 17:37:55 oes
343 * - Re-enabled Netscape 200/404 bug workaround in block_url():
344 * - Removed OS/2 special case
345 * - Made block_url() independant from sed() having been run
346 * - Made trust_url independant from sed() having been run
347 * - Made is_imageurl independant from sed() having been run.
348 * It now checks User-Agent: and Accept: by itself.
351 * Revision 1.39 2001/10/25 03:40:48 david__schmidt
352 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
353 * threads to call select() simultaneously. So, it's time to do a real, live,
354 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
355 * (native). Both versions will work, but using __OS2__ offers multi-threading.
357 * Revision 1.38 2001/10/23 21:32:33 jongfoster
358 * Adding error-checking to selected functions
360 * Revision 1.37 2001/10/22 15:33:56 david__schmidt
361 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
362 * filters.c. Added a FIXME in front of the offending code. I'll gladly
363 * put in a better/more robust fix for all parties if one is presented...
364 * It seems that just returning 200 instead of 404 would pretty much fix
365 * it for everyone, but I don't know all the history of the problem.
367 * Revision 1.36 2001/10/10 16:44:16 oes
368 * Added match_portlist function
370 * Revision 1.35 2001/10/07 15:41:23 oes
371 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
373 * New function remove_chunked_transfer_coding that strips chunked
374 * transfer coding to plain and is called by pcrs_filter_response
375 * and gif_deanimate_response if neccessary
377 * Improved handling of zero-change re_filter runs
379 * pcrs_filter_response and gif_deanimate_response now remove
380 * chunked transfer codeing before processing the body.
382 * Revision 1.34 2001/09/20 15:49:36 steudten
384 * Fix BUG: Change int size to size_t size in pcrs_filter_response().
385 * See cgi.c fill_template().
387 * Revision 1.33 2001/09/16 17:05:14 jongfoster
388 * Removing unused #include showarg.h
390 * Revision 1.32 2001/09/16 13:21:27 jongfoster
391 * Changes to use new list functions.
393 * Revision 1.31 2001/09/16 11:38:02 jongfoster
394 * Splitting fill_template() into 2 functions:
395 * template_load() loads the file
396 * template_fill() performs the PCRS regexps.
397 * This is because the CGI edit interface has a "table row"
398 * template which is used many times in the page - this
399 * change means it's only loaded from disk once.
401 * Revision 1.30 2001/09/16 11:00:10 jongfoster
402 * New function alloc_http_response, for symmetry with free_http_response
404 * Revision 1.29 2001/09/13 23:32:40 jongfoster
405 * Moving image data to cgi.c rather than cgi.h
406 * Fixing a GPF under Win32 (and any other OS that protects global
407 * constants from being written to).
409 * Revision 1.28 2001/09/10 10:18:51 oes
410 * Silenced compiler warnings
412 * Revision 1.27 2001/08/05 16:06:20 jongfoster
413 * Modifiying "struct map" so that there are now separate header and
414 * "map_entry" structures. This means that functions which modify a
415 * map no longer need to return a pointer to the modified map.
416 * Also, it no longer reverses the order of the entries (which may be
417 * important with some advanced template substitutions).
419 * Revision 1.26 2001/07/30 22:08:36 jongfoster
420 * Tidying up #defines:
421 * - All feature #defines are now of the form FEATURE_xxx
422 * - Permanently turned off WIN_GUI_EDIT
423 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
425 * Revision 1.25 2001/07/26 10:09:46 oes
426 * Made browser detection a little less naive
428 * Revision 1.24 2001/07/25 17:22:51 oes
429 * Added workaround for Netscape bug that prevents display of page when loading a component fails.
431 * Revision 1.23 2001/07/23 13:40:12 oes
432 * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
434 * Revision 1.22 2001/07/18 12:29:34 oes
435 * - Made gif_deanimate_response respect
436 * csp->action->string[ACTION_STRING_DEANIMATE]
437 * - Logging cosmetics
439 * Revision 1.21 2001/07/13 13:59:53 oes
440 * - Introduced gif_deanimate_response which shares the
441 * generic content modification interface of pcrs_filter_response
442 * and acts as a wrapper to deanimate.c:gif_deanimate()
443 * - Renamed re_process_buffer to pcrs_filter_response
444 * - pcrs_filter_response now returns NULL on failiure
445 * - Removed all #ifdef PCRS
447 * Revision 1.20 2001/07/01 17:01:04 oes
448 * Added comments and missing return statement in is_untrusted_url()
450 * Revision 1.19 2001/06/29 21:45:41 oes
451 * Indentation, CRLF->LF, Tab-> Space
453 * Revision 1.18 2001/06/29 13:27:38 oes
454 * - Cleaned up, renamed and reorderd functions
455 * and improved comments
458 * - Ported to CGI platform. Now delivers
459 * http_response or NULL
460 * - Unified HTML and GIF generation (moved image detection
461 * and GIF generation here from jcc.c:chat())
462 * - Fixed HTTP status to:
463 * - 403 (Forbidden) for the "blocked" HTML message
464 * - 200 (OK) for GIF answers
465 * - 302 (Redirect) for redirect to GIF
468 * - Ported to CGI platform. Now delivers
469 * http_response or NULL
470 * - Separated detection of untrusted URL into
471 * (bool)is_untrusted_url
472 * - Added enforcement of untrusted requests
474 * - Moved redirect_url() from cgi.c to here
475 * and ported it to the CGI platform
477 * - Removed logentry from cancelled commit
479 * Revision 1.17 2001/06/09 10:55:28 jongfoster
480 * Changing BUFSIZ ==> BUFFER_SIZE
482 * Revision 1.16 2001/06/07 23:10:26 jongfoster
483 * Allowing unanchored domain patterns to back off and retry
484 * if they partially match. Optimized right-anchored patterns.
485 * Moving ACL and forward files into config file.
486 * Replacing struct gateway with struct forward_spec
488 * Revision 1.15 2001/06/03 19:12:00 oes
489 * extracted-CGI relevant stuff
491 * Revision 1.14 2001/06/01 10:30:55 oes
492 * Added optional left-anchoring to domaincmp
494 * Revision 1.13 2001/05/31 21:21:30 jongfoster
495 * Permissionsfile / actions file changes:
496 * - Changed "permission" to "action" throughout
497 * - changes to file format to allow string parameters
498 * - Moved helper functions to actions.c
500 * Revision 1.12 2001/05/31 17:35:20 oes
502 * - Enhanced domain part globbing with infix and prefix asterisk
503 * matching and optional unanchored operation
505 * Revision 1.11 2001/05/29 11:53:23 oes
506 * "See why" link added to "blocked" page
508 * Revision 1.10 2001/05/29 09:50:24 jongfoster
509 * Unified blocklist/imagelist/permissionslist.
510 * File format is still under discussion, but the internal changes
513 * Also modified interceptor behaviour:
514 * - We now intercept all URLs beginning with one of the following
515 * prefixes (and *only* these prefixes):
517 * * http://ijbswa.sf.net/config/
518 * * http://ijbswa.sourceforge.net/config/
519 * - New interceptors "home page" - go to http://i.j.b/ to see it.
520 * - Internal changes so that intercepted and fast redirect pages
521 * are not replaced with an image.
522 * - Interceptors now have the option to send a binary page direct
523 * to the client. (i.e. ijb-send-banner uses this)
524 * - Implemented show-url-info interceptor. (Which is why I needed
525 * the above interceptors changes - a typical URL is
526 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
527 * The previous mechanism would not have intercepted that, and
528 * if it had been intercepted then it then it would have replaced
531 * Revision 1.9 2001/05/27 22:17:04 oes
533 * - re_process_buffer no longer writes the modified buffer
534 * to the client, which was very ugly. It now returns the
535 * buffer, which it is then written by chat.
537 * - content_length now adjusts the Content-Length: header
538 * for modified documents rather than crunch()ing it.
539 * (Length info in csp->content_length, which is 0 for
540 * unmodified documents)
542 * - For this to work, sed() is called twice when filtering.
544 * Revision 1.8 2001/05/26 17:13:28 jongfoster
545 * Filled in a function comment.
547 * Revision 1.7 2001/05/26 15:26:15 jongfoster
548 * ACL feature now provides more security by immediately dropping
549 * connections from untrusted hosts.
551 * Revision 1.6 2001/05/26 00:28:36 jongfoster
552 * Automatic reloading of config file.
553 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
554 * Most of the global variables have been moved to a new
555 * struct configuration_spec, accessed through csp->config->globalname
556 * Most of the globals remaining are used by the Win32 GUI.
558 * Revision 1.5 2001/05/25 22:34:30 jongfoster
561 * Revision 1.4 2001/05/22 18:46:04 oes
563 * - Enabled filtering banners by size rather than URL
564 * by adding patterns that replace all standard banner
565 * sizes with the "Junkbuster" gif to the re_filterfile
567 * - Enabled filtering WebBugs by providing a pattern
568 * which kills all 1x1 images
570 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
571 * which is selected by the (nonstandard and therefore
572 * capital) letter 'U' in the option string.
573 * It causes the quantifiers to be ungreedy by default.
574 * Appending a ? turns back to greedy (!).
576 * - Added a new interceptor ijb-send-banner, which
577 * sends back the "Junkbuster" gif. Without imagelist or
578 * MSIE detection support, or if tinygif = 1, or the
579 * URL isn't recognized as an imageurl, a lame HTML
580 * explanation is sent instead.
582 * - Added new feature, which permits blocking remote
583 * script redirects and firing back a local redirect
585 * The feature is conditionally compiled, i.e. it
586 * can be disabled with --disable-fast-redirects,
587 * plus it must be activated by a "fast-redirects"
588 * line in the config file, has its own log level
589 * and of course wants to be displayed by show-proxy-args
590 * Note: Boy, all the #ifdefs in 1001 locations and
591 * all the fumbling with configure.in and acconfig.h
592 * were *way* more work than the feature itself :-(
594 * - Because a generic redirect template was needed for
595 * this, tinygif = 3 now uses the same.
597 * - Moved GIFs, and other static HTTP response templates
602 * - Removed some >400 CRs again (Jon, you really worked
605 * Revision 1.3 2001/05/20 16:44:47 jongfoster
606 * Removing last hardcoded Junkbusters.com URLs.
608 * Revision 1.2 2001/05/20 01:21:20 jongfoster
609 * Version 2.9.4 checkin.
610 * - Merged popupfile and cookiefile, and added control over PCRS
611 * filtering, in new "permissionsfile".
612 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
613 * file error you now get a message box (in the Win32 GUI) rather
614 * than the program exiting with no explanation.
615 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
617 * - Removed tabs from "config"
618 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
619 * - Bumped up version number.
621 * Revision 1.1.1.1 2001/05/15 13:58:52 oes
622 * Initial import of version 2.9.3 source tree
625 *********************************************************************/
631 #include <sys/types.h>
640 #endif /* ndef __OS2__ */
641 #include <netinet/in.h>
643 #include <winsock2.h>
644 #endif /* ndef _WIN32 */
648 #endif /* def __OS2__ */
656 #include "jbsockets.h"
657 #include "miscutil.h"
661 #include "deanimate.h"
662 #include "urlmatch.h"
669 const char filters_h_rcs[] = FILTERS_H_VERSION;
671 /* Fix a problem with Solaris. There should be no effect on other
673 * Solaris's isspace() is a macro which uses it's argument directly
674 * as an array index. Therefore we need to make sure that high-bit
675 * characters generate +ve values, and ideally we also want to make
676 * the argument match the declared parameter type of "int".
678 #define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
680 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
681 static jb_err prepare_for_filtering(struct client_state *csp);
684 /*********************************************************************
686 * Function : block_acl
688 * Description : Block this request?
689 * Decide yes or no based on ACL file.
692 * 1 : dst = The proxy or gateway address this is going to.
693 * Or NULL to check all possible targets.
694 * 2 : csp = Current client state (buffers, headers, etc...)
695 * Also includes the client IP address.
697 * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
699 *********************************************************************/
700 int block_acl(struct access_control_addr *dst, struct client_state *csp)
702 struct access_control_list *acl = csp->config->acl;
704 /* if not using an access control list, then permit the connection */
710 /* search the list */
713 if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
717 /* Just want to check if they have any access */
718 if (acl->action == ACL_PERMIT)
723 else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
724 && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
726 if (acl->action == ACL_PERMIT)
744 /*********************************************************************
746 * Function : acl_addr
748 * Description : Called from `load_config' to parse an ACL address.
751 * 1 : aspec = String specifying ACL address.
752 * 2 : aca = struct access_control_addr to fill in.
754 * Returns : 0 => Ok, everything else is an error.
756 *********************************************************************/
757 int acl_addr(const char *aspec, struct access_control_addr *aca)
762 char *acl_spec = NULL;
768 * Use a temporary acl spec copy so we can log
769 * the unmodified original in case of parse errors.
771 acl_spec = strdup(aspec);
772 if (acl_spec == NULL)
774 /* XXX: This will be logged as parse error. */
778 if ((p = strchr(acl_spec, '/')) != NULL)
781 if (ijb_isdigit(*p) == 0)
786 masklength = atoi(p);
789 if ((masklength < 0) || (masklength > 32))
795 if ((p = strchr(acl_spec, ':')) != NULL)
800 port = strtol(p, &endptr, 10);
802 if (port <= 0 || port > 65535 || *endptr != '\0')
809 aca->port = (unsigned long)port;
811 aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
814 if (aca->addr == INADDR_NONE)
816 /* XXX: This will be logged as parse error. */
820 /* build the netmask */
822 for (i=1; i <= masklength ; i++)
824 aca->mask |= (1 << (32 - i));
827 /* now mask off the host portion of the ip address
828 * (i.e. save on the network portion of the address).
830 aca->addr = aca->addr & aca->mask;
835 #endif /* def FEATURE_ACL */
838 /*********************************************************************
840 * Function : connect_port_is_forbidden
842 * Description : Check to see if CONNECT requests to the destination
843 * port of this request are forbidden. The check is
844 * independend of the actual request method.
847 * 1 : csp = Current client state (buffers, headers, etc...)
849 * Returns : True if yes, false otherwise.
851 *********************************************************************/
852 int connect_port_is_forbidden(const struct client_state *csp)
854 return ((csp->action->flags & ACTION_LIMIT_CONNECT) &&
855 !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT],
860 /*********************************************************************
862 * Function : block_url
864 * Description : Called from `chat'. Check to see if we need to block this.
867 * 1 : csp = Current client state (buffers, headers, etc...)
869 * Returns : NULL => unblocked, else HTTP block response
871 *********************************************************************/
872 struct http_response *block_url(struct client_state *csp)
874 struct http_response *rsp;
875 const char *new_content_type = NULL;
878 * If it's not blocked, don't block it ;-)
880 if ((csp->action->flags & ACTION_BLOCK) == 0)
884 if (csp->action->flags & ACTION_REDIRECT)
886 log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
889 * Else, prepare a response
891 if (NULL == (rsp = alloc_http_response()))
893 return cgi_error_memory();
897 * If it's an image-url, send back an image or redirect
898 * as specified by the relevant +image action
900 #ifdef FEATURE_IMAGE_BLOCKING
901 if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
905 /* determine HOW images should be blocked */
906 p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
908 if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
910 log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
912 #if 1 /* Two alternative strategies, use this one for now: */
914 /* and handle accordingly: */
915 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
917 rsp->status = strdup("403 Request blocked by Privoxy");
918 if (rsp->status == NULL)
920 free_http_response(rsp);
921 return cgi_error_memory();
923 rsp->body = bindup(image_pattern_data, image_pattern_length);
924 if (rsp->body == NULL)
926 free_http_response(rsp);
927 return cgi_error_memory();
929 rsp->content_length = image_pattern_length;
931 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
933 free_http_response(rsp);
934 return cgi_error_memory();
938 else if (0 == strcmpic(p, "blank"))
940 rsp->status = strdup("403 Request blocked by Privoxy");
941 if (rsp->status == NULL)
943 free_http_response(rsp);
944 return cgi_error_memory();
946 rsp->body = bindup(image_blank_data, image_blank_length);
947 if (rsp->body == NULL)
949 free_http_response(rsp);
950 return cgi_error_memory();
952 rsp->content_length = image_blank_length;
954 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
956 free_http_response(rsp);
957 return cgi_error_memory();
963 rsp->status = strdup("302 Local Redirect from Privoxy");
964 if (rsp->status == NULL)
966 free_http_response(rsp);
967 return cgi_error_memory();
970 if (enlist_unique_header(rsp->headers, "Location", p))
972 free_http_response(rsp);
973 return cgi_error_memory();
977 #else /* Following code is disabled for now */
979 /* and handle accordingly: */
980 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
982 p = CGI_PREFIX "send-banner?type=pattern";
984 else if (0 == strcmpic(p, "blank"))
986 p = CGI_PREFIX "send-banner?type=blank";
988 rsp->status = strdup("302 Local Redirect from Privoxy");
989 if (rsp->status == NULL)
991 free_http_response(rsp);
992 return cgi_error_memory();
995 if (enlist_unique_header(rsp->headers, "Location", p))
997 free_http_response(rsp);
998 return cgi_error_memory();
1000 #endif /* Preceeding code is disabled for now */
1002 else if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
1005 * Send empty document.
1007 new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
1010 rsp->body = strdup(" ");
1011 rsp->content_length = 1;
1013 rsp->status = strdup("403 Request blocked by Privoxy");
1014 if (rsp->status == NULL)
1016 free_http_response(rsp);
1017 return cgi_error_memory();
1019 if (new_content_type != 0)
1021 log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
1022 if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
1024 free_http_response(rsp);
1025 return cgi_error_memory();
1030 #endif /* def FEATURE_IMAGE_BLOCKING */
1033 * Else, generate an HTML "blocked" message:
1037 struct map * exports;
1041 * Workaround for stupid Netscape bug which prevents
1042 * pages from being displayed if loading a referenced
1043 * JavaScript or style sheet fails. So make it appear
1044 * as if it succeeded.
1046 if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
1047 && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
1048 && !strstr(p, "Gecko") /* save Mozilla, */
1049 && !strstr(p, "compatible") /* MSIE */
1050 && !strstr(p, "Opera")) /* and Opera. */
1052 rsp->status = strdup("200 Request for blocked URL");
1056 rsp->status = strdup("403 Request for blocked URL");
1059 if (rsp->status == NULL)
1061 free_http_response(rsp);
1062 return cgi_error_memory();
1065 exports = default_exports(csp, NULL);
1066 if (exports == NULL)
1068 free_http_response(rsp);
1069 return cgi_error_memory();
1072 #ifdef FEATURE_FORCE_LOAD
1073 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1075 * Export the force conditional block killer if
1077 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1078 * - Privoxy is configured to enforce blocks, or
1079 * - it's a CONNECT request and enforcing wouldn't work anyway.
1081 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1082 || (0 == strcmpic(csp->http->gpc, "connect")))
1083 #endif /* ndef FEATURE_FORCE_LOAD */
1085 err = map_block_killer(exports, "force-support");
1088 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1089 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
1090 if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
1091 if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
1094 const char *block_reason;
1095 if (csp->action->string[ACTION_STRING_BLOCK] != NULL)
1097 block_reason = csp->action->string[ACTION_STRING_BLOCK];
1101 assert(connect_port_is_forbidden(csp));
1102 block_reason = "Forbidden CONNECT port.";
1104 err = map(exports, "block-reason", 1, html_encode(block_reason), 0);
1109 free_http_response(rsp);
1110 return cgi_error_memory();
1113 err = template_fill_for_cgi(csp, "blocked", exports, rsp);
1116 free_http_response(rsp);
1117 return cgi_error_memory();
1120 rsp->reason = RSP_REASON_BLOCKED;
1122 return finish_http_response(csp, rsp);
1127 #ifdef FEATURE_TRUST
1128 /*********************************************************************
1130 * Function : trust_url FIXME: I should be called distrust_url
1132 * Description : Calls is_untrusted_url to determine if the URL is trusted
1133 * and if not, returns a HTTP 403 response with a reject message.
1136 * 1 : csp = Current client state (buffers, headers, etc...)
1138 * Returns : NULL => trusted, else http_response.
1140 *********************************************************************/
1141 struct http_response *trust_url(struct client_state *csp)
1143 struct http_response *rsp;
1144 struct map * exports;
1145 char buf[BUFFER_SIZE];
1147 struct url_spec **tl;
1152 * Don't bother to work on trusted URLs
1154 if (!is_untrusted_url(csp))
1160 * Else, prepare a response:
1162 if (NULL == (rsp = alloc_http_response()))
1164 return cgi_error_memory();
1167 rsp->status = strdup("403 Request blocked by Privoxy");
1168 exports = default_exports(csp, NULL);
1169 if (exports == NULL || rsp->status == NULL)
1171 free_http_response(rsp);
1172 return cgi_error_memory();
1176 * Export the protocol, host, port, and referrer information
1178 err = map(exports, "hostport", 1, csp->http->hostport, 1);
1179 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1180 if (!err) err = map(exports, "path", 1, csp->http->path, 1);
1182 if (NULL != (p = get_header_value(csp->headers, "Referer:")))
1184 if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
1188 if (!err) err = map(exports, "referrer", 1, "none set", 1);
1194 free_http_response(rsp);
1195 return cgi_error_memory();
1199 * Export the trust list
1202 for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
1204 snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
1205 string_append(&p, buf);
1207 err = map(exports, "trusted-referrers", 1, p, 0);
1212 free_http_response(rsp);
1213 return cgi_error_memory();
1217 * Export the trust info, if available
1219 if (csp->config->trust_info->first)
1221 struct list_entry *l;
1224 for (l = csp->config->trust_info->first; l ; l = l->next)
1226 snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
1227 string_append(&p, buf);
1229 err = map(exports, "trust-info", 1, p, 0);
1233 err = map_block_killer(exports, "have-trust-info");
1239 free_http_response(rsp);
1240 return cgi_error_memory();
1244 * Export the force conditional block killer if
1246 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1247 * - Privoxy is configured to enforce blocks, or
1248 * - it's a CONNECT request and enforcing wouldn't work anyway.
1250 #ifdef FEATURE_FORCE_LOAD
1251 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1252 || (0 == strcmpic(csp->http->gpc, "connect")))
1254 err = map_block_killer(exports, "force-support");
1258 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1260 #else /* ifndef FEATURE_FORCE_LOAD */
1261 err = map_block_killer(exports, "force-support");
1262 #endif /* ndef FEATURE_FORCE_LOAD */
1267 free_http_response(rsp);
1268 return cgi_error_memory();
1272 * Build the response
1274 err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
1277 free_http_response(rsp);
1278 return cgi_error_memory();
1280 rsp->reason = RSP_REASON_UNTRUSTED;
1282 return finish_http_response(csp, rsp);
1284 #endif /* def FEATURE_TRUST */
1287 /*********************************************************************
1289 * Function : compile_dynamic_pcrs_job_list
1291 * Description : Compiles a dynamic pcrs job list (one with variables
1292 * resolved at request time)
1295 * 1 : csp = Current client state (buffers, headers, etc...)
1296 * 2 : b = The filter list to compile
1298 * Returns : NULL in case of errors, otherwise the
1301 *********************************************************************/
1302 pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
1304 struct list_entry *pattern;
1305 pcrs_job *job_list = NULL;
1306 pcrs_job *dummy = NULL;
1307 pcrs_job *lastjob = NULL;
1310 const struct pcrs_variable variables[] =
1312 {"url", csp->http->url, 1},
1313 {"path", csp->http->path, 1},
1314 {"host", csp->http->host, 1},
1315 {"origin", csp->ip_addr_str, 1},
1319 for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
1321 assert(pattern->str != NULL);
1323 dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
1327 log_error(LOG_LEVEL_ERROR,
1328 "Adding filter job \'%s\' to dynamic filter %s failed: %s",
1329 pattern->str, b->name, pcrs_strerror(error));
1334 if (error == PCRS_WARN_TRUNCATION)
1336 log_error(LOG_LEVEL_ERROR,
1337 "At least one of the variables in \'%s\' had to "
1338 "be truncated before compilation", pattern->str);
1340 if (job_list == NULL)
1346 lastjob->next = dummy;
1356 /*********************************************************************
1358 * Function : rewrite_url
1360 * Description : Rewrites a URL with a single pcrs command
1361 * and returns the result if it differs from the
1362 * original and isn't obviously invalid.
1365 * 1 : old_url = URL to rewrite.
1366 * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
1369 * Returns : NULL if the pcrs_command didn't change the url, or
1370 * the result of the modification.
1372 *********************************************************************/
1373 char *rewrite_url(char *old_url, const char *pcrs_command)
1375 char *new_url = NULL;
1379 assert(pcrs_command);
1381 new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
1385 log_error(LOG_LEVEL_REDIRECTS,
1386 "pcrs command \"%s\" didn't change \"%s\".",
1387 pcrs_command, old_url);
1392 log_error(LOG_LEVEL_REDIRECTS,
1393 "executing pcrs command \"%s\" to rewrite %s failed: %s",
1394 pcrs_command, old_url, pcrs_strerror(hits));
1397 else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
1399 log_error(LOG_LEVEL_ERROR,
1400 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
1401 "but the result doesn't look like a valid URL and will be ignored.",
1402 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1407 log_error(LOG_LEVEL_REDIRECTS,
1408 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
1409 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1417 #ifdef FEATURE_FAST_REDIRECTS
1418 /*********************************************************************
1420 * Function : get_last_url
1422 * Description : Search for the last URL inside a string.
1423 * If the string already is a URL, it will
1424 * be the first URL found.
1427 * 1 : subject = the string to check
1428 * 2 : redirect_mode = +fast-redirect{} mode
1430 * Returns : NULL if no URL was found, or
1431 * the last URL found.
1433 *********************************************************************/
1434 char *get_last_url(char *subject, const char *redirect_mode)
1436 char *new_url = NULL;
1440 assert(redirect_mode);
1442 subject = strdup(subject);
1443 if (subject == NULL)
1445 log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
1449 if (0 == strcmpic(redirect_mode, "check-decoded-url"))
1451 log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
1452 new_url = url_decode(subject);
1453 if (new_url != NULL)
1460 log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
1464 log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
1467 * Find the last URL encoded in the request
1470 while ((tmp = strstr(tmp, "http://")) != NULL)
1474 tmp = (new_url != NULL) ? new_url : subject;
1475 while ((tmp = strstr(tmp, "https://")) != NULL)
1480 if ((new_url != NULL)
1481 && ( (new_url != subject)
1482 || (0 == strncmpic(subject, "http://", 7))
1483 || (0 == strncmpic(subject, "https://", 8))
1487 * Return new URL if we found a redirect
1488 * or if the subject already was a URL.
1490 * The second case makes sure that we can
1491 * chain get_last_url after another redirection check
1492 * (like rewrite_url) without losing earlier redirects.
1494 new_url = strdup(new_url);
1503 #endif /* def FEATURE_FAST_REDIRECTS */
1506 /*********************************************************************
1508 * Function : redirect_url
1510 * Description : Checks if Privoxy should answer the request with
1511 * a HTTP redirect and generates the redirect if
1515 * 1 : csp = Current client state (buffers, headers, etc...)
1517 * Returns : NULL if the request can pass, HTTP redirect otherwise.
1519 *********************************************************************/
1520 struct http_response *redirect_url(struct client_state *csp)
1522 struct http_response *rsp;
1523 #ifdef FEATURE_FAST_REDIRECTS
1525 * XXX: Do we still need FEATURE_FAST_REDIRECTS
1526 * as compile-time option? The user can easily disable
1527 * it in his action file.
1529 char * redirect_mode;
1530 #endif /* def FEATURE_FAST_REDIRECTS */
1531 char *old_url = NULL;
1532 char *new_url = NULL;
1533 char *redirection_string;
1535 if ((csp->action->flags & ACTION_REDIRECT))
1537 redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
1540 * If the redirection string begins with 's',
1541 * assume it's a pcrs command, otherwise treat it as
1542 * properly formatted URL and use it for the redirection
1545 * According to RFC 2616 section 14.30 the URL
1546 * has to be absolute and if the user tries:
1547 * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
1548 * she would get undefined results anyway.
1552 if (*redirection_string == 's')
1554 old_url = csp->http->url;
1555 new_url = rewrite_url(old_url, redirection_string);
1559 log_error(LOG_LEVEL_REDIRECTS,
1560 "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
1561 redirection_string);
1562 new_url = strdup(redirection_string);
1566 #ifdef FEATURE_FAST_REDIRECTS
1567 if ((csp->action->flags & ACTION_FAST_REDIRECTS))
1569 redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
1572 * If it exists, use the previously rewritten URL as input
1573 * otherwise just use the old path.
1575 old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
1576 new_url = get_last_url(old_url, redirect_mode);
1581 * Disable redirect checkers, so that they
1582 * will be only run more than once if the user
1583 * also enables them through tags.
1585 * From a performance point of view
1586 * it doesn't matter, but the duplicated
1587 * log messages are annoying.
1589 csp->action->flags &= ~ACTION_FAST_REDIRECTS;
1590 #endif /* def FEATURE_FAST_REDIRECTS */
1591 csp->action->flags &= ~ACTION_REDIRECT;
1593 /* Did any redirect action trigger? */
1596 if (0 == strcmpic(new_url, csp->http->url))
1598 log_error(LOG_LEVEL_ERROR,
1599 "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
1600 csp->http->url, new_url);
1605 log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
1607 if (NULL == (rsp = alloc_http_response()))
1610 return cgi_error_memory();
1613 if ( enlist_unique_header(rsp->headers, "Location", new_url)
1614 || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
1617 free_http_response(rsp);
1618 return cgi_error_memory();
1620 rsp->reason = RSP_REASON_REDIRECTED;
1623 return finish_http_response(csp, rsp);
1627 /* Only reached if no redirect is required */
1633 #ifdef FEATURE_IMAGE_BLOCKING
1634 /*********************************************************************
1636 * Function : is_imageurl
1638 * Description : Given a URL, decide whether it is an image or not,
1639 * using either the info from a previous +image action
1640 * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
1641 * is MSIE and not on a Mac, tell from the browser's accept
1645 * 1 : csp = Current client state (buffers, headers, etc...)
1647 * Returns : True (nonzero) if URL is an image, false (0)
1650 *********************************************************************/
1651 int is_imageurl(const struct client_state *csp)
1653 #ifdef FEATURE_IMAGE_DETECT_MSIE
1656 tmp = get_header_value(csp->headers, "User-Agent:");
1657 if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
1659 tmp = get_header_value(csp->headers, "Accept:");
1660 if (tmp && strstr(tmp, "image/gif"))
1662 /* Client will accept HTML. If this seems counterintuitive,
1672 #endif /* def FEATURE_IMAGE_DETECT_MSIE */
1674 return ((csp->action->flags & ACTION_IMAGE) != 0);
1677 #endif /* def FEATURE_IMAGE_BLOCKING */
1680 #ifdef FEATURE_TRUST
1681 /*********************************************************************
1683 * Function : is_untrusted_url
1685 * Description : Should we "distrust" this URL (and block it)?
1687 * Yes if it matches a line in the trustfile, or if the
1688 * referrer matches a line starting with "+" in the
1693 * 1 : csp = Current client state (buffers, headers, etc...)
1695 * Returns : 0 => trusted, 1 => untrusted
1697 *********************************************************************/
1698 int is_untrusted_url(const struct client_state *csp)
1700 struct file_list *fl;
1701 struct block_spec *b;
1702 struct url_spec **trusted_url;
1703 struct http_request rhttp[1];
1704 const char * referer;
1708 * If we don't have a trustlist, we trust everybody
1710 if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
1715 memset(rhttp, '\0', sizeof(*rhttp));
1718 * Do we trust the request URL itself?
1720 for (b = b->next; b ; b = b->next)
1722 if (url_match(b->url, csp->http))
1728 if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
1730 /* no referrer was supplied */
1736 * If not, do we maybe trust its referrer?
1738 err = parse_http_url(referer, rhttp, csp);
1744 for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
1746 if (url_match(*trusted_url, rhttp))
1748 /* if the URL's referrer is from a trusted referrer, then
1749 * add the target spec to the trustfile as an unblocked
1750 * domain and return 0 (which means it's OK).
1755 if (NULL != (fp = fopen(csp->config->trustfile, "a")))
1759 char * new_entry = strdup("~");
1761 string_append(&new_entry, csp->http->hostport);
1763 path = csp->http->path;
1764 if ( (path[0] == '/')
1766 && ((path_end = strchr(path + 2, '/')) != NULL))
1768 /* since this path points into a user's home space
1769 * be sure to include this spec in the trustfile.
1771 int path_len = path_end - path; /* save offset */
1772 path = strdup(path); /* Copy string */
1775 path_end = path + path_len; /* regenerate ptr to new buffer */
1776 *(path_end + 1) = '\0'; /* Truncate path after '/' */
1778 string_join(&new_entry, path);
1782 * Give a reason for generating this entry.
1784 string_append(&new_entry, " # Trusted referrer was: ");
1785 string_append(&new_entry, referer);
1787 if (new_entry != NULL)
1789 if (-1 == fprintf(fp, "%s\n", new_entry))
1791 log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
1792 new_entry, csp->config->trustfile);
1798 /* FIXME: No way to handle out-of memory, so mostly ignoring it */
1799 log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
1806 log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
1807 csp->http->hostport, csp->config->trustfile);
1815 #endif /* def FEATURE_TRUST */
1818 /*********************************************************************
1820 * Function : pcrs_filter_response
1822 * Description : Execute all text substitutions from all applying
1823 * +filter actions on the text buffer that's been
1824 * accumulated in csp->iob->buf.
1827 * 1 : csp = Current client state (buffers, headers, etc...)
1829 * Returns : a pointer to the (newly allocated) modified buffer.
1830 * or NULL if there were no hits or something went wrong
1832 *********************************************************************/
1833 static char *pcrs_filter_response(struct client_state *csp)
1836 size_t size, prev_size;
1842 struct file_list *fl;
1843 struct re_filterfile_spec *b;
1844 struct list_entry *filtername;
1846 int i, found_filters = 0;
1851 if (csp->iob->cur >= csp->iob->eod)
1857 * Need to check the set of re_filterfiles...
1859 for (i = 0; i < MAX_AF_FILES; i++)
1872 if (0 == found_filters)
1874 log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
1875 "content filtering enabled, but no content filters available.");
1879 size = (size_t)(csp->iob->eod - csp->iob->cur);
1880 old = csp->iob->cur;
1882 for (i = 0; i < MAX_AF_FILES; i++)
1885 if ((NULL == fl) || (NULL == fl->f))
1888 * Either there are no filter files
1889 * left, or this filter file just
1890 * contains no valid filters.
1892 * Continue to be sure we don't miss
1893 * valid filter files that are chained
1894 * after empty or invalid ones.
1899 * For all applying +filter actions, look if a filter by that
1900 * name exists and if yes, execute it's pcrs_joblist on the
1903 for (b = fl->f; b; b = b->next)
1905 if (b->type != FT_CONTENT_FILTER)
1907 /* Skip header filters */
1911 for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
1912 filtername ; filtername = filtername->next)
1914 if (strcmp(b->name, filtername->str) == 0)
1916 int current_hits = 0; /* Number of hits caused by this filter */
1917 int job_number = 0; /* Which job we're currently executing */
1918 int job_hits = 0; /* How many hits the current job caused */
1919 pcrs_job *joblist = b->joblist;
1921 if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
1923 if (NULL == joblist)
1925 log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
1930 /* Apply all jobs from the joblist */
1931 for (job = joblist; NULL != job; job = job->next)
1934 job_hits = pcrs_execute(job, old, size, &new, &size);
1939 * That went well. Continue filtering
1940 * and use the result of this job as
1941 * input for the next one.
1943 current_hits += job_hits;
1944 if (old != csp->iob->cur)
1953 * This job caused an unexpected error. Inform the user
1954 * and skip the rest of the jobs in this filter. We could
1955 * continue with the next job, but usually the jobs
1956 * depend on each other or are similar enough to
1957 * fail for the same reason.
1959 * At the moment our pcrs expects the error codes of pcre 3.4,
1960 * but newer pcre versions can return additional error codes.
1961 * As a result pcrs_strerror()'s error message might be
1962 * "Unknown error ...", therefore we print the numerical value
1965 * XXX: Is this important enough for LOG_LEVEL_ERROR or
1966 * should we use LOG_LEVEL_RE_FILTER instead?
1968 log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
1969 b->name, job_number, pcrs_strerror(job_hits), job_hits);
1974 if (b->dynamic) pcrs_free_joblist(joblist);
1976 log_error(LOG_LEVEL_RE_FILTER,
1977 "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
1978 csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
1980 hits += current_hits;
1987 * If there were no hits, destroy our copy and let
1988 * chat() use the original in csp->iob
1996 csp->flags |= CSP_FLAG_MODIFIED;
1997 csp->content_length = size;
2005 /*********************************************************************
2007 * Function : gif_deanimate_response
2009 * Description : Deanimate the GIF image that has been accumulated in
2010 * csp->iob->buf, set csp->content_length to the modified
2011 * size and raise the CSP_FLAG_MODIFIED flag.
2014 * 1 : csp = Current client state (buffers, headers, etc...)
2016 * Returns : a pointer to the (newly allocated) modified buffer.
2017 * or NULL in case something went wrong.
2019 *********************************************************************/
2020 static char *gif_deanimate_response(struct client_state *csp)
2022 struct binbuffer *in, *out;
2026 size = (size_t)(csp->iob->eod - csp->iob->cur);
2028 if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
2029 || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
2031 log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
2035 in->buffer = csp->iob->cur;
2038 if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
2040 log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
2047 if ((int)size == out->offset)
2049 log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
2053 log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
2055 csp->content_length = out->offset;
2056 csp->flags |= CSP_FLAG_MODIFIED;
2066 /*********************************************************************
2068 * Function : get_filter_function
2070 * Description : Decides which content filter function has
2071 * to be applied (if any).
2073 * XXX: Doesn't handle filter_popups()
2074 * because of the different prototype. Probably
2075 * we should ditch filter_popups() anyway, it's
2076 * even less reliable than popup blocking based
2080 * 1 : csp = Current client state (buffers, headers, etc...)
2082 * Returns : The content filter function to run, or
2083 * NULL if no content filter is active
2085 *********************************************************************/
2086 filter_function_ptr get_filter_function(struct client_state *csp)
2088 filter_function_ptr filter_function = NULL;
2091 * Are we enabling text mode by force?
2093 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
2096 * Do we really have to?
2098 if (csp->content_type & CT_TEXT)
2100 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
2104 csp->content_type |= CT_TEXT;
2105 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
2109 if (!(csp->content_type & CT_DECLARED))
2112 * The server didn't bother to declare a MIME-Type.
2113 * Assume it's text that can be filtered.
2115 * This also regulary happens with 304 responses,
2116 * therefore logging anything here would cause
2119 csp->content_type |= CT_TEXT;
2123 * Choose the applying filter function based on
2124 * the content type and action settings.
2126 if ((csp->content_type & CT_TEXT) &&
2127 (csp->rlist != NULL) &&
2128 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
2130 filter_function = pcrs_filter_response;
2132 else if ((csp->content_type & CT_GIF) &&
2133 (csp->action->flags & ACTION_DEANIMATE))
2135 filter_function = gif_deanimate_response;
2138 return filter_function;
2142 /*********************************************************************
2144 * Function : remove_chunked_transfer_coding
2146 * Description : In-situ remove the "chunked" transfer coding as defined
2147 * in rfc2616 from a buffer.
2150 * 1 : buffer = Pointer to the text buffer
2151 * 2 : size = In: Number of bytes to be processed,
2152 * Out: Number of bytes after de-chunking.
2153 * (undefined in case of errors)
2155 * Returns : JB_ERR_OK for success,
2156 * JB_ERR_PARSE otherwise
2158 *********************************************************************/
2159 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
2162 unsigned int chunksize = 0;
2163 char *from_p, *to_p;
2166 from_p = to_p = buffer;
2168 if (sscanf(buffer, "%x", &chunksize) != 1)
2170 log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
2171 return JB_ERR_PARSE;
2174 while (chunksize > 0)
2176 if (NULL == (from_p = strstr(from_p, "\r\n")))
2178 log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
2179 return JB_ERR_PARSE;
2182 if ((newsize += chunksize) >= *size)
2184 log_error(LOG_LEVEL_ERROR, "Chunksize exceeds buffer in \"chunked\" transfer coding");
2185 return JB_ERR_PARSE;
2189 memmove(to_p, from_p, (size_t) chunksize);
2190 to_p = buffer + newsize;
2191 from_p += chunksize + 2;
2193 if (sscanf(from_p, "%x", &chunksize) != 1)
2195 log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
2200 /* XXX: Should get its own loglevel. */
2201 log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
2210 /*********************************************************************
2212 * Function : prepare_for_filtering
2214 * Description : If necessary, de-chunks and decompresses
2215 * the content so it can get filterd.
2218 * 1 : csp = Current client state (buffers, headers, etc...)
2220 * Returns : JB_ERR_OK for success,
2221 * JB_ERR_PARSE otherwise
2223 *********************************************************************/
2224 static jb_err prepare_for_filtering(struct client_state *csp)
2226 jb_err err = JB_ERR_OK;
2229 * If the body has a "chunked" transfer-encoding,
2230 * get rid of it, adjusting size and iob->eod
2232 if (csp->flags & CSP_FLAG_CHUNKED)
2234 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
2236 log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
2237 err = remove_chunked_transfer_coding(csp->iob->cur, &size);
2238 if (JB_ERR_OK == err)
2240 csp->iob->eod = csp->iob->cur + size;
2241 csp->flags |= CSP_FLAG_MODIFIED;
2245 return JB_ERR_PARSE;
2251 * If the body has a supported transfer-encoding,
2252 * decompress it, adjusting size and iob->eod.
2254 if (csp->content_type & (CT_GZIP|CT_DEFLATE))
2256 if (0 == csp->iob->eod - csp->iob->cur)
2258 /* Nothing left after de-chunking. */
2262 err = decompress_iob(csp);
2264 if (JB_ERR_OK == err)
2266 csp->flags |= CSP_FLAG_MODIFIED;
2267 csp->content_type &= ~CT_TABOO;
2272 * Unset CT_GZIP and CT_DEFLATE to remember not
2273 * to modify the Content-Encoding header later.
2275 csp->content_type &= ~CT_GZIP;
2276 csp->content_type &= ~CT_DEFLATE;
2285 /*********************************************************************
2287 * Function : execute_content_filter
2289 * Description : Executes a given content filter.
2292 * 1 : csp = Current client state (buffers, headers, etc...)
2293 * 2 : content_filter = The filter function to execute
2295 * Returns : Pointer to the modified buffer, or
2296 * NULL if filtering failed or wasn't necessary.
2298 *********************************************************************/
2299 char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
2301 if (0 == csp->iob->eod - csp->iob->cur)
2304 * No content (probably status code 301, 302 ...),
2305 * no filtering necessary.
2310 if (JB_ERR_OK != prepare_for_filtering(csp))
2313 * failed to de-chunk or decompress.
2318 if (0 == csp->iob->eod - csp->iob->cur)
2321 * Clown alarm: chunked and/or compressed nothing delivered.
2326 return ((*content_filter)(csp));
2330 /*********************************************************************
2332 * Function : get_url_actions
2334 * Description : Gets the actions for this URL.
2337 * 1 : csp = Current client state (buffers, headers, etc...)
2338 * 2 : http = http_request request for blocked URLs
2342 *********************************************************************/
2343 void get_url_actions(struct client_state *csp, struct http_request *http)
2345 struct file_list *fl;
2346 struct url_actions *b;
2349 init_current_action(csp->action);
2351 for (i = 0; i < MAX_AF_FILES; i++)
2353 if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
2358 apply_url_actions(csp->action, http, b);
2365 /*********************************************************************
2367 * Function : apply_url_actions
2369 * Description : Applies a list of URL actions.
2372 * 1 : action = Destination.
2373 * 2 : http = Current URL
2374 * 3 : b = list of URL actions to apply
2378 *********************************************************************/
2379 void apply_url_actions(struct current_action_spec *action,
2380 struct http_request *http,
2381 struct url_actions *b)
2385 /* Should never happen */
2389 for (b = b->next; NULL != b; b = b->next)
2391 if (url_match(b->url, http))
2393 merge_current_action(action, b->action);
2399 /*********************************************************************
2401 * Function : get_forward_override_settings
2403 * Description : Returns forward settings as specified with the
2404 * forward-override{} action. forward-override accepts
2405 * forward lines similar to the one used in the
2406 * configuration file, but without the URL pattern.
2412 * in the configuration file can be replaced with
2413 * the action section:
2415 * {+forward-override{forward .}}
2419 * 1 : csp = Current client state (buffers, headers, etc...)
2421 * Returns : Pointer to forwarding structure in case of success.
2422 * Invalid syntax is fatal.
2424 *********************************************************************/
2425 const static struct forward_spec *get_forward_override_settings(struct client_state *csp)
2427 const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
2428 char forward_settings[BUFFER_SIZE];
2429 char *http_parent = NULL;
2430 /* variable names were chosen for consistency reasons. */
2431 struct forward_spec *fwd = NULL;
2435 assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
2436 /* Should be enforced by load_one_actions_file() */
2437 assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
2439 /* Create a copy ssplit can modify */
2440 strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
2442 if (NULL != csp->fwd)
2445 * XXX: Currently necessary to prevent memory
2446 * leaks when the show-url-info cgi page is visited.
2448 unload_forward_spec(csp->fwd);
2452 * allocate a new forward node, valid only for
2453 * the lifetime of this request. Save its location
2454 * in csp as well, so sweep() can free it later on.
2456 fwd = csp->fwd = zalloc(sizeof(*fwd));
2459 log_error(LOG_LEVEL_FATAL,
2460 "can't allocate memory for forward-override{%s}", forward_override_line);
2461 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2464 vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
2465 if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
2467 fwd->type = SOCKS_NONE;
2469 /* Parse the parent HTTP proxy host:port */
2470 http_parent = vec[1];
2473 else if (vec_count == 3)
2475 char *socks_proxy = NULL;
2477 if (!strcasecmp(vec[0], "forward-socks4"))
2479 fwd->type = SOCKS_4;
2480 socks_proxy = vec[1];
2482 else if (!strcasecmp(vec[0], "forward-socks4a"))
2484 fwd->type = SOCKS_4A;
2485 socks_proxy = vec[1];
2487 else if (!strcasecmp(vec[0], "forward-socks5"))
2489 fwd->type = SOCKS_5;
2490 socks_proxy = vec[1];
2493 if (NULL != socks_proxy)
2495 /* Parse the SOCKS proxy host[:port] */
2496 fwd->gateway_host = strdup(socks_proxy);
2498 if (NULL != (socks_proxy = strchr(fwd->gateway_host, ':')))
2500 *socks_proxy++ = '\0';
2501 fwd->gateway_port = strtol(socks_proxy, NULL, 0);
2504 if (fwd->gateway_port <= 0)
2506 fwd->gateway_port = 1080;
2509 http_parent = vec[2];
2513 if (NULL == http_parent)
2515 log_error(LOG_LEVEL_FATAL,
2516 "Invalid forward-override syntax in: %s", forward_override_line);
2517 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2520 /* Parse http forwarding settings */
2521 if (strcmp(http_parent, ".") != 0)
2523 fwd->forward_host = strdup(http_parent);
2525 if (NULL != (http_parent = strchr(fwd->forward_host, ':')))
2527 *http_parent++ = '\0';
2528 fwd->forward_port = strtol(http_parent, NULL, 0);
2531 if (fwd->forward_port <= 0)
2533 fwd->forward_port = 8000;
2537 assert (NULL != fwd);
2539 log_error(LOG_LEVEL_CONNECT,
2540 "Overriding forwarding settings based on \'%s\'", forward_override_line);
2546 /*********************************************************************
2548 * Function : forward_url
2550 * Description : Should we forward this to another proxy?
2553 * 1 : csp = Current client state (buffers, headers, etc...)
2554 * 2 : http = http_request request for current URL
2556 * Returns : Pointer to forwarding information.
2558 *********************************************************************/
2559 const struct forward_spec *forward_url(struct client_state *csp,
2560 const struct http_request *http)
2562 static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
2563 struct forward_spec *fwd = csp->config->forward;
2565 if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
2567 return get_forward_override_settings(csp);
2577 if (url_match(fwd->url, http))
2588 /*********************************************************************
2590 * Function : direct_response
2592 * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
2593 * request and if so, return a HTTP 501 to the client.
2595 * FIXME: I have a stupid name and I should handle the
2596 * requests properly. Still, what we do here is rfc-
2597 * compliant, whereas ignoring or forwarding are not.
2600 * 1 : csp = Current client state (buffers, headers, etc...)
2602 * Returns : http_response if , NULL if nonmatch or handler fail
2604 *********************************************************************/
2605 struct http_response *direct_response(struct client_state *csp)
2607 struct http_response *rsp;
2608 struct list_entry *p;
2610 if ((0 == strcmpic(csp->http->gpc, "trace"))
2611 || (0 == strcmpic(csp->http->gpc, "options")))
2613 for (p = csp->headers->first; (p != NULL) ; p = p->next)
2615 if (!strncmpic("Max-Forwards:", p->str, 13))
2617 unsigned int max_forwards;
2620 * If it's a Max-Forwards value of zero,
2621 * we have to intercept the request.
2623 if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
2626 * FIXME: We could handle at least TRACE here,
2627 * but that would require a verbatim copy of
2628 * the request which we don't have anymore
2630 log_error(LOG_LEVEL_HEADER,
2631 "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
2634 /* Get mem for response or fail*/
2635 if (NULL == (rsp = alloc_http_response()))
2637 return cgi_error_memory();
2640 if (NULL == (rsp->status = strdup("501 Not Implemented")))
2642 free_http_response(rsp);
2643 return cgi_error_memory();
2647 rsp->reason = RSP_REASON_UNSUPPORTED;
2649 return(finish_http_response(csp, rsp));
2658 /*********************************************************************
2660 * Function : content_filters_enabled
2662 * Description : Checks whether there are any content filters
2663 * enabled for the current request.
2666 * 1 : action = Action spec to check.
2668 * Returns : TRUE for yes, FALSE otherwise
2670 *********************************************************************/
2671 int content_filters_enabled(const struct current_action_spec *action)
2673 return ((action->flags & ACTION_DEANIMATE) ||
2674 !list_is_empty(action->multi[ACTION_MULTI_FILTER]));