1 const char filters_rcs[] = "$Id: filters.c,v 1.107 2008/05/04 17:52:56 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 1.107 2008/05/04 17:52:56 fabiankeil
44 * Adjust parse_http_url() call to new prototype.
46 * Revision 1.106 2008/05/03 16:40:44 fabiankeil
47 * Change content_filters_enabled()'s parameter from
48 * csp->action to action so it can be also used in the
49 * CGI code. Don't bother checking if there are filters
50 * loaded, as that's somewhat besides the point.
52 * Revision 1.105 2008/03/28 15:13:39 fabiankeil
53 * Remove inspect-jpegs action.
55 * Revision 1.104 2008/03/27 18:27:24 fabiankeil
56 * Remove kill-popups action.
58 * Revision 1.103 2008/03/06 16:33:45 fabiankeil
59 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
61 * Revision 1.102 2008/03/01 14:00:44 fabiankeil
62 * Let the block action take the reason for the block
63 * as argument and show it on the "blocked" page.
65 * Revision 1.101 2008/02/23 16:57:12 fabiankeil
66 * Rename url_actions() to get_url_actions() and let it
67 * use the standard parameter ordering.
69 * Revision 1.100 2008/02/23 16:33:43 fabiankeil
70 * Let forward_url() use the standard parameter ordering
71 * and mark its second parameter immutable.
73 * Revision 1.99 2008/02/03 13:57:58 fabiankeil
74 * Add SOCKS5 support for forward-override{}.
76 * Revision 1.98 2008/01/04 17:43:45 fabiankeil
77 * Improve the warning messages that get logged if the action files
78 * "enable" filters but no filters of that type have been loaded.
80 * Revision 1.97 2007/11/30 15:37:03 fabiankeil
81 * Use freez instead of free.
83 * Revision 1.96 2007/10/19 16:53:28 fabiankeil
84 * Add helper function to check if any content filters are enabled.
86 * Revision 1.95 2007/10/17 19:31:20 fabiankeil
87 * Omitting the zero chunk that ends the chunk transfer encoding seems
88 * to be the new black. Log the problem and continue filtering anyway.
90 * Revision 1.94 2007/09/29 13:20:20 fabiankeil
91 * Remove two redundant and one useless log messages.
93 * Revision 1.93 2007/09/29 10:21:16 fabiankeil
94 * - Move get_filter_function() from jcc.c to filters.c
95 * so the filter functions can be static.
96 * - Don't bother filtering body-less responses.
98 * Revision 1.92 2007/09/28 16:38:55 fabiankeil
99 * - Execute content filters through execute_content_filter().
100 * - Add prepare_for_filtering() so filter functions don't have to
101 * care about de-chunking and decompression. As a side effect this enables
102 * decompression for gif_deanimate_response() and jpeg_inspect_response().
103 * - Change remove_chunked_transfer_coding()'s return type to jb_err.
104 * Some clowns feel like chunking empty responses in which case
105 * (size == 0) is valid but previously would be interpreted as error.
107 * Revision 1.91 2007/09/02 15:31:20 fabiankeil
108 * Move match_portlist() from filter.c to urlmatch.c.
109 * It's used for url matching, not for filtering.
111 * Revision 1.90 2007/09/02 12:44:17 fabiankeil
112 * Remove newline at the end of a log_error() message.
114 * Revision 1.89 2007/08/05 13:42:23 fabiankeil
115 * #1763173 from Stefan Huehner: declare some more functions static.
117 * Revision 1.88 2007/06/01 16:41:11 fabiankeil
118 * Add forward-override{} to change the forwarding settings through
119 * action sections. This is mainly interesting to forward different
120 * clients differently (for example based on User-Agent or request
123 * Revision 1.87 2007/04/30 15:53:10 fabiankeil
124 * Make sure filters with dynamic jobs actually use them.
126 * Revision 1.86 2007/04/30 15:03:28 fabiankeil
127 * - Introduce dynamic pcrs jobs that can resolve variables.
128 * - Don't run redirect functions more than once,
129 * unless they are activated more than once.
131 * Revision 1.85 2007/03/21 12:24:47 fabiankeil
132 * - Log the content size after decompression in decompress_iob()
133 * instead of pcrs_filter_response().
135 * Revision 1.84 2007/03/20 15:16:34 fabiankeil
136 * Use dedicated header filter actions instead of abusing "filter".
137 * Replace "filter-client-headers" and "filter-client-headers"
138 * with "server-header-filter" and "client-header-filter".
140 * Revision 1.83 2007/03/17 15:20:05 fabiankeil
141 * New config option: enforce-blocks.
143 * Revision 1.82 2007/03/13 11:28:43 fabiankeil
144 * - Fix port handling in acl_addr() and use a temporary acl spec
145 * copy so error messages don't contain a truncated version.
146 * - Log size of iob before and after decompression.
148 * Revision 1.81 2007/03/05 14:40:53 fabiankeil
149 * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
150 * - Hide the "Go there anyway" link for blocked CONNECT
151 * requests where going there anyway doesn't work anyway.
153 * Revision 1.80 2007/02/07 10:55:20 fabiankeil
154 * - Save the reason for generating http_responses.
155 * - Block (+block) with status code 403 instead of 404.
156 * - Use a different kludge to remember a failed decompression.
158 * Revision 1.79 2007/01/31 16:21:38 fabiankeil
159 * Search for Max-Forwards headers case-insensitive,
160 * don't generate the "501 unsupported" message for invalid
161 * Max-Forwards values and don't increase negative ones.
163 * Revision 1.78 2007/01/28 13:41:18 fabiankeil
164 * - Add HEAD support to finish_http_response.
165 * - Add error favicon to internal HTML error messages.
167 * Revision 1.77 2007/01/12 15:36:44 fabiankeil
168 * Mark *csp as immutable for is_untrusted_url()
169 * and is_imageurl(). Closes FR 1237736.
171 * Revision 1.76 2007/01/01 19:36:37 fabiankeil
172 * Integrate a modified version of Wil Mahan's
173 * zlib patch (PR #895531).
175 * Revision 1.75 2006/12/29 18:30:46 fabiankeil
176 * Fixed gcc43 conversion warnings,
177 * changed sprintf calls to snprintf.
179 * Revision 1.74 2006/12/24 17:37:38 fabiankeil
180 * Adjust comment in pcrs_filter_response()
181 * to recent pcrs changes. Hohoho.
183 * Revision 1.73 2006/12/23 16:01:02 fabiankeil
184 * Don't crash if pcre returns an error code
185 * that pcrs didn't expect. Fixes BR 1621173.
187 * Revision 1.72 2006/12/22 18:52:53 fabiankeil
188 * Modified is_untrusted_url to complain in case of
189 * write errors and to give a reason when adding new
190 * entries to the trustfile. Closes FR 1097611.
192 * Revision 1.71 2006/12/22 14:24:52 fabiankeil
193 * Skip empty filter files in pcrs_filter_response,
194 * but don't ignore the ones that come afterwards.
195 * Fixes parts of BR 1619208.
197 * Revision 1.70 2006/12/09 13:33:15 fabiankeil
198 * Added some sanity checks for get_last_url().
199 * Fixed possible segfault caused by my last commit.
201 * Revision 1.69 2006/12/08 12:39:13 fabiankeil
202 * Let get_last_url() catch https URLs as well.
204 * Revision 1.68 2006/12/05 14:45:48 fabiankeil
205 * Make sure get_last_url() behaves like advertised
206 * and fast-redirects{} can be combined with redirect{}.
208 * Revision 1.67 2006/11/28 15:19:43 fabiankeil
209 * Implemented +redirect{s@foo@bar@} to generate
210 * a redirect based on a rewritten version of the
213 * Revision 1.66 2006/09/23 13:26:38 roro
214 * Replace TABs by spaces in source code.
216 * Revision 1.65 2006/09/21 12:54:43 fabiankeil
217 * Fix +redirect{}. Didn't work with -fast-redirects.
219 * Revision 1.64 2006/08/31 10:55:49 fabiankeil
220 * Block requests for untrusted URLs with status
221 * code 403 instead of 200.
223 * Revision 1.63 2006/08/31 10:11:28 fabiankeil
224 * Don't free p which is still in use and will be later
225 * freed by free_map(). Don't claim the referrer is unknown
226 * when the client didn't set one.
228 * Revision 1.62 2006/08/14 00:27:47 david__schmidt
229 * Feature request 595948: Re-Filter logging in single line
231 * Revision 1.61 2006/08/03 02:46:41 david__schmidt
232 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
234 * Revision 1.60 2006/07/18 14:48:46 david__schmidt
235 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
236 * with what was really the latest development (the v_3_0_branch branch)
238 * Revision 1.58.2.9 2006/01/29 23:10:56 david__schmidt
239 * Multiple filter file support
241 * Revision 1.58.2.8 2005/05/07 21:50:55 david__schmidt
242 * A few memory leaks plugged (mostly on error paths)
244 * Revision 1.58.2.7 2004/10/03 12:53:32 david__schmidt
245 * Add the ability to check jpeg images for invalid
246 * lengths of comment blocks. Defensive strategy
247 * against the exploit:
248 * Microsoft Security Bulletin MS04-028
249 * Buffer Overrun in JPEG Processing (GDI+) Could
250 * Allow Code Execution (833987)
251 * Enabled with +inspect-jpegs in actions files.
253 * Revision 1.58.2.6 2003/12/06 22:18:27 gliptak
254 * Correcting compile problem with FEATURE_IMAGE_BLOCKING
256 * Revision 1.58.2.5 2003/11/11 13:10:31 oes
257 * Fixed bug #839859: "See why" link URL now gets url-encoded.
259 * Revision 1.58.2.4 2003/02/28 12:52:45 oes
262 * Revision 1.58.2.3 2002/09/25 14:51:51 oes
263 * Added basic support for OPTIONS and TRACE HTTP methods:
264 * New function direct_response which handles OPTIONS and
265 * TRACE requests whose Max-Forwards header field is zero.
267 * Revision 1.58.2.2 2002/08/01 17:18:28 oes
268 * Fixed BR 537651 / SR 579724 (MSIE image detect improper for IE/Mac)
270 * Revision 1.58.2.1 2002/07/26 15:18:53 oes
271 * - Bugfix: Executing a filters without jobs no longer results in
272 * turing off *all* filters.
273 * - Security fix: Malicious web servers can't cause a seg fault
274 * through bogus chunk sizes anymore
276 * Revision 1.58 2002/04/24 02:11:17 oes
277 * Jon's multiple AF patch: url_actions now evaluates rules
280 * Revision 1.57 2002/04/08 20:38:34 swa
283 * Revision 1.56 2002/04/05 15:51:24 oes
284 * - bugfix: error-pages now get correct request protocol
285 * - fix for invalid HTML in trust info
287 * Revision 1.55 2002/04/02 16:13:51 oes
288 * Fix: No "Go there anyway" for SSL
290 * Revision 1.54 2002/04/02 14:55:56 oes
291 * Bugfix: is_untrusted_url() now depends on FEATURE_TRUST, not FEATURE_COOKIE_JAR
293 * Revision 1.53 2002/03/26 22:29:54 swa
294 * we have a new homepage!
296 * Revision 1.52 2002/03/24 16:35:57 jongfoster
299 * Revision 1.51 2002/03/24 15:23:33 jongfoster
302 * Revision 1.50 2002/03/24 13:25:43 swa
303 * name change related issues
305 * Revision 1.49 2002/03/16 20:29:14 oes
308 * Revision 1.48 2002/03/13 20:25:34 oes
309 * Better logging for content filters
311 * Revision 1.47 2002/03/13 00:30:52 jongfoster
313 * Added option of always sending redirect for imageblock,
314 * currently disabled with #if 0.
316 * Revision 1.46 2002/03/12 01:42:49 oes
317 * Introduced modular filters
319 * Revision 1.45 2002/03/08 16:47:50 oes
320 * Added choice beween GIF and PNG built-in images
322 * Revision 1.44 2002/03/07 03:49:31 oes
323 * - Fixed compiler warnings etc
324 * - Changed built-in images from GIF to PNG
325 * (with regard to Unisys patent issue)
326 * - Added a 4x4 pattern PNG which is less intrusive
327 * than the logo but also clearly marks the deleted banners
329 * Revision 1.43 2002/01/22 23:51:59 jongfoster
330 * Replacing strsav() with the safer string_append().
332 * Adding missing html_encode() to error message generators. Where encoded
333 * and unencoded versions of a string were provided, removing the unencoded
336 * Revision 1.42 2002/01/17 21:00:32 jongfoster
337 * Moving all our URL and URL pattern parsing code to urlmatch.c.
339 * Using a single, simple url_match(pattern,url) function - rather than
340 * the 3-line match routine which was repeated all over the place.
342 * Renaming free_url to free_url_spec, since it frees a struct url_spec.
344 * Using parse_http_url() to parse URLs without faking a HTTP
345 * request line for parse_http_request().
347 * Revision 1.41 2001/11/13 00:14:07 jongfoster
348 * Fixing stupid bug now I've figured out what || means.
349 * (It always returns 0 or 1, not one of it's paramaters.)
351 * Revision 1.40 2001/10/26 17:37:55 oes
352 * - Re-enabled Netscape 200/404 bug workaround in block_url():
353 * - Removed OS/2 special case
354 * - Made block_url() independant from sed() having been run
355 * - Made trust_url independant from sed() having been run
356 * - Made is_imageurl independant from sed() having been run.
357 * It now checks User-Agent: and Accept: by itself.
360 * Revision 1.39 2001/10/25 03:40:48 david__schmidt
361 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
362 * threads to call select() simultaneously. So, it's time to do a real, live,
363 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
364 * (native). Both versions will work, but using __OS2__ offers multi-threading.
366 * Revision 1.38 2001/10/23 21:32:33 jongfoster
367 * Adding error-checking to selected functions
369 * Revision 1.37 2001/10/22 15:33:56 david__schmidt
370 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
371 * filters.c. Added a FIXME in front of the offending code. I'll gladly
372 * put in a better/more robust fix for all parties if one is presented...
373 * It seems that just returning 200 instead of 404 would pretty much fix
374 * it for everyone, but I don't know all the history of the problem.
376 * Revision 1.36 2001/10/10 16:44:16 oes
377 * Added match_portlist function
379 * Revision 1.35 2001/10/07 15:41:23 oes
380 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
382 * New function remove_chunked_transfer_coding that strips chunked
383 * transfer coding to plain and is called by pcrs_filter_response
384 * and gif_deanimate_response if neccessary
386 * Improved handling of zero-change re_filter runs
388 * pcrs_filter_response and gif_deanimate_response now remove
389 * chunked transfer codeing before processing the body.
391 * Revision 1.34 2001/09/20 15:49:36 steudten
393 * Fix BUG: Change int size to size_t size in pcrs_filter_response().
394 * See cgi.c fill_template().
396 * Revision 1.33 2001/09/16 17:05:14 jongfoster
397 * Removing unused #include showarg.h
399 * Revision 1.32 2001/09/16 13:21:27 jongfoster
400 * Changes to use new list functions.
402 * Revision 1.31 2001/09/16 11:38:02 jongfoster
403 * Splitting fill_template() into 2 functions:
404 * template_load() loads the file
405 * template_fill() performs the PCRS regexps.
406 * This is because the CGI edit interface has a "table row"
407 * template which is used many times in the page - this
408 * change means it's only loaded from disk once.
410 * Revision 1.30 2001/09/16 11:00:10 jongfoster
411 * New function alloc_http_response, for symmetry with free_http_response
413 * Revision 1.29 2001/09/13 23:32:40 jongfoster
414 * Moving image data to cgi.c rather than cgi.h
415 * Fixing a GPF under Win32 (and any other OS that protects global
416 * constants from being written to).
418 * Revision 1.28 2001/09/10 10:18:51 oes
419 * Silenced compiler warnings
421 * Revision 1.27 2001/08/05 16:06:20 jongfoster
422 * Modifiying "struct map" so that there are now separate header and
423 * "map_entry" structures. This means that functions which modify a
424 * map no longer need to return a pointer to the modified map.
425 * Also, it no longer reverses the order of the entries (which may be
426 * important with some advanced template substitutions).
428 * Revision 1.26 2001/07/30 22:08:36 jongfoster
429 * Tidying up #defines:
430 * - All feature #defines are now of the form FEATURE_xxx
431 * - Permanently turned off WIN_GUI_EDIT
432 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
434 * Revision 1.25 2001/07/26 10:09:46 oes
435 * Made browser detection a little less naive
437 * Revision 1.24 2001/07/25 17:22:51 oes
438 * Added workaround for Netscape bug that prevents display of page when loading a component fails.
440 * Revision 1.23 2001/07/23 13:40:12 oes
441 * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
443 * Revision 1.22 2001/07/18 12:29:34 oes
444 * - Made gif_deanimate_response respect
445 * csp->action->string[ACTION_STRING_DEANIMATE]
446 * - Logging cosmetics
448 * Revision 1.21 2001/07/13 13:59:53 oes
449 * - Introduced gif_deanimate_response which shares the
450 * generic content modification interface of pcrs_filter_response
451 * and acts as a wrapper to deanimate.c:gif_deanimate()
452 * - Renamed re_process_buffer to pcrs_filter_response
453 * - pcrs_filter_response now returns NULL on failiure
454 * - Removed all #ifdef PCRS
456 * Revision 1.20 2001/07/01 17:01:04 oes
457 * Added comments and missing return statement in is_untrusted_url()
459 * Revision 1.19 2001/06/29 21:45:41 oes
460 * Indentation, CRLF->LF, Tab-> Space
462 * Revision 1.18 2001/06/29 13:27:38 oes
463 * - Cleaned up, renamed and reorderd functions
464 * and improved comments
467 * - Ported to CGI platform. Now delivers
468 * http_response or NULL
469 * - Unified HTML and GIF generation (moved image detection
470 * and GIF generation here from jcc.c:chat())
471 * - Fixed HTTP status to:
472 * - 403 (Forbidden) for the "blocked" HTML message
473 * - 200 (OK) for GIF answers
474 * - 302 (Redirect) for redirect to GIF
477 * - Ported to CGI platform. Now delivers
478 * http_response or NULL
479 * - Separated detection of untrusted URL into
480 * (bool)is_untrusted_url
481 * - Added enforcement of untrusted requests
483 * - Moved redirect_url() from cgi.c to here
484 * and ported it to the CGI platform
486 * - Removed logentry from cancelled commit
488 * Revision 1.17 2001/06/09 10:55:28 jongfoster
489 * Changing BUFSIZ ==> BUFFER_SIZE
491 * Revision 1.16 2001/06/07 23:10:26 jongfoster
492 * Allowing unanchored domain patterns to back off and retry
493 * if they partially match. Optimized right-anchored patterns.
494 * Moving ACL and forward files into config file.
495 * Replacing struct gateway with struct forward_spec
497 * Revision 1.15 2001/06/03 19:12:00 oes
498 * extracted-CGI relevant stuff
500 * Revision 1.14 2001/06/01 10:30:55 oes
501 * Added optional left-anchoring to domaincmp
503 * Revision 1.13 2001/05/31 21:21:30 jongfoster
504 * Permissionsfile / actions file changes:
505 * - Changed "permission" to "action" throughout
506 * - changes to file format to allow string parameters
507 * - Moved helper functions to actions.c
509 * Revision 1.12 2001/05/31 17:35:20 oes
511 * - Enhanced domain part globbing with infix and prefix asterisk
512 * matching and optional unanchored operation
514 * Revision 1.11 2001/05/29 11:53:23 oes
515 * "See why" link added to "blocked" page
517 * Revision 1.10 2001/05/29 09:50:24 jongfoster
518 * Unified blocklist/imagelist/permissionslist.
519 * File format is still under discussion, but the internal changes
522 * Also modified interceptor behaviour:
523 * - We now intercept all URLs beginning with one of the following
524 * prefixes (and *only* these prefixes):
526 * * http://ijbswa.sf.net/config/
527 * * http://ijbswa.sourceforge.net/config/
528 * - New interceptors "home page" - go to http://i.j.b/ to see it.
529 * - Internal changes so that intercepted and fast redirect pages
530 * are not replaced with an image.
531 * - Interceptors now have the option to send a binary page direct
532 * to the client. (i.e. ijb-send-banner uses this)
533 * - Implemented show-url-info interceptor. (Which is why I needed
534 * the above interceptors changes - a typical URL is
535 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
536 * The previous mechanism would not have intercepted that, and
537 * if it had been intercepted then it then it would have replaced
540 * Revision 1.9 2001/05/27 22:17:04 oes
542 * - re_process_buffer no longer writes the modified buffer
543 * to the client, which was very ugly. It now returns the
544 * buffer, which it is then written by chat.
546 * - content_length now adjusts the Content-Length: header
547 * for modified documents rather than crunch()ing it.
548 * (Length info in csp->content_length, which is 0 for
549 * unmodified documents)
551 * - For this to work, sed() is called twice when filtering.
553 * Revision 1.8 2001/05/26 17:13:28 jongfoster
554 * Filled in a function comment.
556 * Revision 1.7 2001/05/26 15:26:15 jongfoster
557 * ACL feature now provides more security by immediately dropping
558 * connections from untrusted hosts.
560 * Revision 1.6 2001/05/26 00:28:36 jongfoster
561 * Automatic reloading of config file.
562 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
563 * Most of the global variables have been moved to a new
564 * struct configuration_spec, accessed through csp->config->globalname
565 * Most of the globals remaining are used by the Win32 GUI.
567 * Revision 1.5 2001/05/25 22:34:30 jongfoster
570 * Revision 1.4 2001/05/22 18:46:04 oes
572 * - Enabled filtering banners by size rather than URL
573 * by adding patterns that replace all standard banner
574 * sizes with the "Junkbuster" gif to the re_filterfile
576 * - Enabled filtering WebBugs by providing a pattern
577 * which kills all 1x1 images
579 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
580 * which is selected by the (nonstandard and therefore
581 * capital) letter 'U' in the option string.
582 * It causes the quantifiers to be ungreedy by default.
583 * Appending a ? turns back to greedy (!).
585 * - Added a new interceptor ijb-send-banner, which
586 * sends back the "Junkbuster" gif. Without imagelist or
587 * MSIE detection support, or if tinygif = 1, or the
588 * URL isn't recognized as an imageurl, a lame HTML
589 * explanation is sent instead.
591 * - Added new feature, which permits blocking remote
592 * script redirects and firing back a local redirect
594 * The feature is conditionally compiled, i.e. it
595 * can be disabled with --disable-fast-redirects,
596 * plus it must be activated by a "fast-redirects"
597 * line in the config file, has its own log level
598 * and of course wants to be displayed by show-proxy-args
599 * Note: Boy, all the #ifdefs in 1001 locations and
600 * all the fumbling with configure.in and acconfig.h
601 * were *way* more work than the feature itself :-(
603 * - Because a generic redirect template was needed for
604 * this, tinygif = 3 now uses the same.
606 * - Moved GIFs, and other static HTTP response templates
611 * - Removed some >400 CRs again (Jon, you really worked
614 * Revision 1.3 2001/05/20 16:44:47 jongfoster
615 * Removing last hardcoded Junkbusters.com URLs.
617 * Revision 1.2 2001/05/20 01:21:20 jongfoster
618 * Version 2.9.4 checkin.
619 * - Merged popupfile and cookiefile, and added control over PCRS
620 * filtering, in new "permissionsfile".
621 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
622 * file error you now get a message box (in the Win32 GUI) rather
623 * than the program exiting with no explanation.
624 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
626 * - Removed tabs from "config"
627 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
628 * - Bumped up version number.
630 * Revision 1.1.1.1 2001/05/15 13:58:52 oes
631 * Initial import of version 2.9.3 source tree
634 *********************************************************************/
640 #include <sys/types.h>
649 #endif /* ndef __OS2__ */
650 #include <netinet/in.h>
652 #include <winsock2.h>
653 #endif /* ndef _WIN32 */
657 #endif /* def __OS2__ */
665 #include "jbsockets.h"
666 #include "miscutil.h"
670 #include "deanimate.h"
671 #include "urlmatch.h"
678 const char filters_h_rcs[] = FILTERS_H_VERSION;
680 /* Fix a problem with Solaris. There should be no effect on other
682 * Solaris's isspace() is a macro which uses it's argument directly
683 * as an array index. Therefore we need to make sure that high-bit
684 * characters generate +ve values, and ideally we also want to make
685 * the argument match the declared parameter type of "int".
687 #define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
689 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
690 static jb_err prepare_for_filtering(struct client_state *csp);
693 /*********************************************************************
695 * Function : block_acl
697 * Description : Block this request?
698 * Decide yes or no based on ACL file.
701 * 1 : dst = The proxy or gateway address this is going to.
702 * Or NULL to check all possible targets.
703 * 2 : csp = Current client state (buffers, headers, etc...)
704 * Also includes the client IP address.
706 * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
708 *********************************************************************/
709 int block_acl(const struct access_control_addr *dst, const struct client_state *csp)
711 struct access_control_list *acl = csp->config->acl;
713 /* if not using an access control list, then permit the connection */
719 /* search the list */
722 if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
726 /* Just want to check if they have any access */
727 if (acl->action == ACL_PERMIT)
732 else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
733 && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
735 if (acl->action == ACL_PERMIT)
753 /*********************************************************************
755 * Function : acl_addr
757 * Description : Called from `load_config' to parse an ACL address.
760 * 1 : aspec = String specifying ACL address.
761 * 2 : aca = struct access_control_addr to fill in.
763 * Returns : 0 => Ok, everything else is an error.
765 *********************************************************************/
766 int acl_addr(const char *aspec, struct access_control_addr *aca)
771 char *acl_spec = NULL;
777 * Use a temporary acl spec copy so we can log
778 * the unmodified original in case of parse errors.
780 acl_spec = strdup(aspec);
781 if (acl_spec == NULL)
783 /* XXX: This will be logged as parse error. */
787 if ((p = strchr(acl_spec, '/')) != NULL)
790 if (ijb_isdigit(*p) == 0)
795 masklength = atoi(p);
798 if ((masklength < 0) || (masklength > 32))
804 if ((p = strchr(acl_spec, ':')) != NULL)
809 port = strtol(p, &endptr, 10);
811 if (port <= 0 || port > 65535 || *endptr != '\0')
818 aca->port = (unsigned long)port;
820 aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
823 if (aca->addr == INADDR_NONE)
825 /* XXX: This will be logged as parse error. */
829 /* build the netmask */
831 for (i=1; i <= masklength ; i++)
833 aca->mask |= (1 << (32 - i));
836 /* now mask off the host portion of the ip address
837 * (i.e. save on the network portion of the address).
839 aca->addr = aca->addr & aca->mask;
844 #endif /* def FEATURE_ACL */
847 /*********************************************************************
849 * Function : connect_port_is_forbidden
851 * Description : Check to see if CONNECT requests to the destination
852 * port of this request are forbidden. The check is
853 * independend of the actual request method.
856 * 1 : csp = Current client state (buffers, headers, etc...)
858 * Returns : True if yes, false otherwise.
860 *********************************************************************/
861 int connect_port_is_forbidden(const struct client_state *csp)
863 return ((csp->action->flags & ACTION_LIMIT_CONNECT) &&
864 !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT],
869 /*********************************************************************
871 * Function : block_url
873 * Description : Called from `chat'. Check to see if we need to block this.
876 * 1 : csp = Current client state (buffers, headers, etc...)
878 * Returns : NULL => unblocked, else HTTP block response
880 *********************************************************************/
881 struct http_response *block_url(struct client_state *csp)
883 struct http_response *rsp;
884 const char *new_content_type = NULL;
887 * If it's not blocked, don't block it ;-)
889 if ((csp->action->flags & ACTION_BLOCK) == 0)
893 if (csp->action->flags & ACTION_REDIRECT)
895 log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
898 * Else, prepare a response
900 if (NULL == (rsp = alloc_http_response()))
902 return cgi_error_memory();
906 * If it's an image-url, send back an image or redirect
907 * as specified by the relevant +image action
909 #ifdef FEATURE_IMAGE_BLOCKING
910 if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
914 /* determine HOW images should be blocked */
915 p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
917 if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
919 log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
921 #if 1 /* Two alternative strategies, use this one for now: */
923 /* and handle accordingly: */
924 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
926 rsp->status = strdup("403 Request blocked by Privoxy");
927 if (rsp->status == NULL)
929 free_http_response(rsp);
930 return cgi_error_memory();
932 rsp->body = bindup(image_pattern_data, image_pattern_length);
933 if (rsp->body == NULL)
935 free_http_response(rsp);
936 return cgi_error_memory();
938 rsp->content_length = image_pattern_length;
940 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
942 free_http_response(rsp);
943 return cgi_error_memory();
947 else if (0 == strcmpic(p, "blank"))
949 rsp->status = strdup("403 Request blocked by Privoxy");
950 if (rsp->status == NULL)
952 free_http_response(rsp);
953 return cgi_error_memory();
955 rsp->body = bindup(image_blank_data, image_blank_length);
956 if (rsp->body == NULL)
958 free_http_response(rsp);
959 return cgi_error_memory();
961 rsp->content_length = image_blank_length;
963 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
965 free_http_response(rsp);
966 return cgi_error_memory();
972 rsp->status = strdup("302 Local Redirect from Privoxy");
973 if (rsp->status == NULL)
975 free_http_response(rsp);
976 return cgi_error_memory();
979 if (enlist_unique_header(rsp->headers, "Location", p))
981 free_http_response(rsp);
982 return cgi_error_memory();
986 #else /* Following code is disabled for now */
988 /* and handle accordingly: */
989 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
991 p = CGI_PREFIX "send-banner?type=pattern";
993 else if (0 == strcmpic(p, "blank"))
995 p = CGI_PREFIX "send-banner?type=blank";
997 rsp->status = strdup("302 Local Redirect from Privoxy");
998 if (rsp->status == NULL)
1000 free_http_response(rsp);
1001 return cgi_error_memory();
1004 if (enlist_unique_header(rsp->headers, "Location", p))
1006 free_http_response(rsp);
1007 return cgi_error_memory();
1009 #endif /* Preceeding code is disabled for now */
1011 else if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
1014 * Send empty document.
1016 new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
1019 rsp->body = strdup(" ");
1020 rsp->content_length = 1;
1022 rsp->status = strdup("403 Request blocked by Privoxy");
1023 if (rsp->status == NULL)
1025 free_http_response(rsp);
1026 return cgi_error_memory();
1028 if (new_content_type != 0)
1030 log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
1031 if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
1033 free_http_response(rsp);
1034 return cgi_error_memory();
1039 #endif /* def FEATURE_IMAGE_BLOCKING */
1042 * Else, generate an HTML "blocked" message:
1046 struct map * exports;
1050 * Workaround for stupid Netscape bug which prevents
1051 * pages from being displayed if loading a referenced
1052 * JavaScript or style sheet fails. So make it appear
1053 * as if it succeeded.
1055 if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
1056 && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
1057 && !strstr(p, "Gecko") /* save Mozilla, */
1058 && !strstr(p, "compatible") /* MSIE */
1059 && !strstr(p, "Opera")) /* and Opera. */
1061 rsp->status = strdup("200 Request for blocked URL");
1065 rsp->status = strdup("403 Request for blocked URL");
1068 if (rsp->status == NULL)
1070 free_http_response(rsp);
1071 return cgi_error_memory();
1074 exports = default_exports(csp, NULL);
1075 if (exports == NULL)
1077 free_http_response(rsp);
1078 return cgi_error_memory();
1081 #ifdef FEATURE_FORCE_LOAD
1082 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1084 * Export the force conditional block killer if
1086 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1087 * - Privoxy is configured to enforce blocks, or
1088 * - it's a CONNECT request and enforcing wouldn't work anyway.
1090 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1091 || (0 == strcmpic(csp->http->gpc, "connect")))
1092 #endif /* ndef FEATURE_FORCE_LOAD */
1094 err = map_block_killer(exports, "force-support");
1097 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1098 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
1099 if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
1100 if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
1103 const char *block_reason;
1104 if (csp->action->string[ACTION_STRING_BLOCK] != NULL)
1106 block_reason = csp->action->string[ACTION_STRING_BLOCK];
1110 assert(connect_port_is_forbidden(csp));
1111 block_reason = "Forbidden CONNECT port.";
1113 err = map(exports, "block-reason", 1, html_encode(block_reason), 0);
1118 free_http_response(rsp);
1119 return cgi_error_memory();
1122 err = template_fill_for_cgi(csp, "blocked", exports, rsp);
1125 free_http_response(rsp);
1126 return cgi_error_memory();
1129 rsp->reason = RSP_REASON_BLOCKED;
1131 return finish_http_response(csp, rsp);
1136 #ifdef FEATURE_TRUST
1137 /*********************************************************************
1139 * Function : trust_url FIXME: I should be called distrust_url
1141 * Description : Calls is_untrusted_url to determine if the URL is trusted
1142 * and if not, returns a HTTP 403 response with a reject message.
1145 * 1 : csp = Current client state (buffers, headers, etc...)
1147 * Returns : NULL => trusted, else http_response.
1149 *********************************************************************/
1150 struct http_response *trust_url(struct client_state *csp)
1152 struct http_response *rsp;
1153 struct map * exports;
1154 char buf[BUFFER_SIZE];
1156 struct url_spec **tl;
1161 * Don't bother to work on trusted URLs
1163 if (!is_untrusted_url(csp))
1169 * Else, prepare a response:
1171 if (NULL == (rsp = alloc_http_response()))
1173 return cgi_error_memory();
1176 rsp->status = strdup("403 Request blocked by Privoxy");
1177 exports = default_exports(csp, NULL);
1178 if (exports == NULL || rsp->status == NULL)
1180 free_http_response(rsp);
1181 return cgi_error_memory();
1185 * Export the protocol, host, port, and referrer information
1187 err = map(exports, "hostport", 1, csp->http->hostport, 1);
1188 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1189 if (!err) err = map(exports, "path", 1, csp->http->path, 1);
1191 if (NULL != (p = get_header_value(csp->headers, "Referer:")))
1193 if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
1197 if (!err) err = map(exports, "referrer", 1, "none set", 1);
1203 free_http_response(rsp);
1204 return cgi_error_memory();
1208 * Export the trust list
1211 for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
1213 snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
1214 string_append(&p, buf);
1216 err = map(exports, "trusted-referrers", 1, p, 0);
1221 free_http_response(rsp);
1222 return cgi_error_memory();
1226 * Export the trust info, if available
1228 if (csp->config->trust_info->first)
1230 struct list_entry *l;
1233 for (l = csp->config->trust_info->first; l ; l = l->next)
1235 snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
1236 string_append(&p, buf);
1238 err = map(exports, "trust-info", 1, p, 0);
1242 err = map_block_killer(exports, "have-trust-info");
1248 free_http_response(rsp);
1249 return cgi_error_memory();
1253 * Export the force conditional block killer if
1255 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1256 * - Privoxy is configured to enforce blocks, or
1257 * - it's a CONNECT request and enforcing wouldn't work anyway.
1259 #ifdef FEATURE_FORCE_LOAD
1260 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1261 || (0 == strcmpic(csp->http->gpc, "connect")))
1263 err = map_block_killer(exports, "force-support");
1267 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1269 #else /* ifndef FEATURE_FORCE_LOAD */
1270 err = map_block_killer(exports, "force-support");
1271 #endif /* ndef FEATURE_FORCE_LOAD */
1276 free_http_response(rsp);
1277 return cgi_error_memory();
1281 * Build the response
1283 err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
1286 free_http_response(rsp);
1287 return cgi_error_memory();
1289 rsp->reason = RSP_REASON_UNTRUSTED;
1291 return finish_http_response(csp, rsp);
1293 #endif /* def FEATURE_TRUST */
1296 /*********************************************************************
1298 * Function : compile_dynamic_pcrs_job_list
1300 * Description : Compiles a dynamic pcrs job list (one with variables
1301 * resolved at request time)
1304 * 1 : csp = Current client state (buffers, headers, etc...)
1305 * 2 : b = The filter list to compile
1307 * Returns : NULL in case of errors, otherwise the
1310 *********************************************************************/
1311 pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
1313 struct list_entry *pattern;
1314 pcrs_job *job_list = NULL;
1315 pcrs_job *dummy = NULL;
1316 pcrs_job *lastjob = NULL;
1319 const struct pcrs_variable variables[] =
1321 {"url", csp->http->url, 1},
1322 {"path", csp->http->path, 1},
1323 {"host", csp->http->host, 1},
1324 {"origin", csp->ip_addr_str, 1},
1328 for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
1330 assert(pattern->str != NULL);
1332 dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
1336 log_error(LOG_LEVEL_ERROR,
1337 "Adding filter job \'%s\' to dynamic filter %s failed: %s",
1338 pattern->str, b->name, pcrs_strerror(error));
1343 if (error == PCRS_WARN_TRUNCATION)
1345 log_error(LOG_LEVEL_ERROR,
1346 "At least one of the variables in \'%s\' had to "
1347 "be truncated before compilation", pattern->str);
1349 if (job_list == NULL)
1355 lastjob->next = dummy;
1365 /*********************************************************************
1367 * Function : rewrite_url
1369 * Description : Rewrites a URL with a single pcrs command
1370 * and returns the result if it differs from the
1371 * original and isn't obviously invalid.
1374 * 1 : old_url = URL to rewrite.
1375 * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
1378 * Returns : NULL if the pcrs_command didn't change the url, or
1379 * the result of the modification.
1381 *********************************************************************/
1382 char *rewrite_url(char *old_url, const char *pcrs_command)
1384 char *new_url = NULL;
1388 assert(pcrs_command);
1390 new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
1394 log_error(LOG_LEVEL_REDIRECTS,
1395 "pcrs command \"%s\" didn't change \"%s\".",
1396 pcrs_command, old_url);
1401 log_error(LOG_LEVEL_REDIRECTS,
1402 "executing pcrs command \"%s\" to rewrite %s failed: %s",
1403 pcrs_command, old_url, pcrs_strerror(hits));
1406 else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
1408 log_error(LOG_LEVEL_ERROR,
1409 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
1410 "but the result doesn't look like a valid URL and will be ignored.",
1411 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1416 log_error(LOG_LEVEL_REDIRECTS,
1417 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
1418 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1426 #ifdef FEATURE_FAST_REDIRECTS
1427 /*********************************************************************
1429 * Function : get_last_url
1431 * Description : Search for the last URL inside a string.
1432 * If the string already is a URL, it will
1433 * be the first URL found.
1436 * 1 : subject = the string to check
1437 * 2 : redirect_mode = +fast-redirect{} mode
1439 * Returns : NULL if no URL was found, or
1440 * the last URL found.
1442 *********************************************************************/
1443 char *get_last_url(char *subject, const char *redirect_mode)
1445 char *new_url = NULL;
1449 assert(redirect_mode);
1451 subject = strdup(subject);
1452 if (subject == NULL)
1454 log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
1458 if (0 == strcmpic(redirect_mode, "check-decoded-url"))
1460 log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
1461 new_url = url_decode(subject);
1462 if (new_url != NULL)
1469 log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
1473 log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
1476 * Find the last URL encoded in the request
1479 while ((tmp = strstr(tmp, "http://")) != NULL)
1483 tmp = (new_url != NULL) ? new_url : subject;
1484 while ((tmp = strstr(tmp, "https://")) != NULL)
1489 if ((new_url != NULL)
1490 && ( (new_url != subject)
1491 || (0 == strncmpic(subject, "http://", 7))
1492 || (0 == strncmpic(subject, "https://", 8))
1496 * Return new URL if we found a redirect
1497 * or if the subject already was a URL.
1499 * The second case makes sure that we can
1500 * chain get_last_url after another redirection check
1501 * (like rewrite_url) without losing earlier redirects.
1503 new_url = strdup(new_url);
1512 #endif /* def FEATURE_FAST_REDIRECTS */
1515 /*********************************************************************
1517 * Function : redirect_url
1519 * Description : Checks if Privoxy should answer the request with
1520 * a HTTP redirect and generates the redirect if
1524 * 1 : csp = Current client state (buffers, headers, etc...)
1526 * Returns : NULL if the request can pass, HTTP redirect otherwise.
1528 *********************************************************************/
1529 struct http_response *redirect_url(struct client_state *csp)
1531 struct http_response *rsp;
1532 #ifdef FEATURE_FAST_REDIRECTS
1534 * XXX: Do we still need FEATURE_FAST_REDIRECTS
1535 * as compile-time option? The user can easily disable
1536 * it in his action file.
1538 char * redirect_mode;
1539 #endif /* def FEATURE_FAST_REDIRECTS */
1540 char *old_url = NULL;
1541 char *new_url = NULL;
1542 char *redirection_string;
1544 if ((csp->action->flags & ACTION_REDIRECT))
1546 redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
1549 * If the redirection string begins with 's',
1550 * assume it's a pcrs command, otherwise treat it as
1551 * properly formatted URL and use it for the redirection
1554 * According to RFC 2616 section 14.30 the URL
1555 * has to be absolute and if the user tries:
1556 * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
1557 * she would get undefined results anyway.
1561 if (*redirection_string == 's')
1563 old_url = csp->http->url;
1564 new_url = rewrite_url(old_url, redirection_string);
1568 log_error(LOG_LEVEL_REDIRECTS,
1569 "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
1570 redirection_string);
1571 new_url = strdup(redirection_string);
1575 #ifdef FEATURE_FAST_REDIRECTS
1576 if ((csp->action->flags & ACTION_FAST_REDIRECTS))
1578 redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
1581 * If it exists, use the previously rewritten URL as input
1582 * otherwise just use the old path.
1584 old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
1585 new_url = get_last_url(old_url, redirect_mode);
1590 * Disable redirect checkers, so that they
1591 * will be only run more than once if the user
1592 * also enables them through tags.
1594 * From a performance point of view
1595 * it doesn't matter, but the duplicated
1596 * log messages are annoying.
1598 csp->action->flags &= ~ACTION_FAST_REDIRECTS;
1599 #endif /* def FEATURE_FAST_REDIRECTS */
1600 csp->action->flags &= ~ACTION_REDIRECT;
1602 /* Did any redirect action trigger? */
1605 if (0 == strcmpic(new_url, csp->http->url))
1607 log_error(LOG_LEVEL_ERROR,
1608 "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
1609 csp->http->url, new_url);
1614 log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
1616 if (NULL == (rsp = alloc_http_response()))
1619 return cgi_error_memory();
1622 if ( enlist_unique_header(rsp->headers, "Location", new_url)
1623 || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
1626 free_http_response(rsp);
1627 return cgi_error_memory();
1629 rsp->reason = RSP_REASON_REDIRECTED;
1632 return finish_http_response(csp, rsp);
1636 /* Only reached if no redirect is required */
1642 #ifdef FEATURE_IMAGE_BLOCKING
1643 /*********************************************************************
1645 * Function : is_imageurl
1647 * Description : Given a URL, decide whether it is an image or not,
1648 * using either the info from a previous +image action
1649 * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
1650 * is MSIE and not on a Mac, tell from the browser's accept
1654 * 1 : csp = Current client state (buffers, headers, etc...)
1656 * Returns : True (nonzero) if URL is an image, false (0)
1659 *********************************************************************/
1660 int is_imageurl(const struct client_state *csp)
1662 #ifdef FEATURE_IMAGE_DETECT_MSIE
1665 tmp = get_header_value(csp->headers, "User-Agent:");
1666 if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
1668 tmp = get_header_value(csp->headers, "Accept:");
1669 if (tmp && strstr(tmp, "image/gif"))
1671 /* Client will accept HTML. If this seems counterintuitive,
1681 #endif /* def FEATURE_IMAGE_DETECT_MSIE */
1683 return ((csp->action->flags & ACTION_IMAGE) != 0);
1686 #endif /* def FEATURE_IMAGE_BLOCKING */
1689 #ifdef FEATURE_TRUST
1690 /*********************************************************************
1692 * Function : is_untrusted_url
1694 * Description : Should we "distrust" this URL (and block it)?
1696 * Yes if it matches a line in the trustfile, or if the
1697 * referrer matches a line starting with "+" in the
1702 * 1 : csp = Current client state (buffers, headers, etc...)
1704 * Returns : 0 => trusted, 1 => untrusted
1706 *********************************************************************/
1707 int is_untrusted_url(const struct client_state *csp)
1709 struct file_list *fl;
1710 struct block_spec *b;
1711 struct url_spec **trusted_url;
1712 struct http_request rhttp[1];
1713 const char * referer;
1717 * If we don't have a trustlist, we trust everybody
1719 if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
1724 memset(rhttp, '\0', sizeof(*rhttp));
1727 * Do we trust the request URL itself?
1729 for (b = b->next; b ; b = b->next)
1731 if (url_match(b->url, csp->http))
1737 if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
1739 /* no referrer was supplied */
1745 * If not, do we maybe trust its referrer?
1747 err = parse_http_url(referer, rhttp, REQUIRE_PROTOCOL);
1753 for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
1755 if (url_match(*trusted_url, rhttp))
1757 /* if the URL's referrer is from a trusted referrer, then
1758 * add the target spec to the trustfile as an unblocked
1759 * domain and return 0 (which means it's OK).
1764 if (NULL != (fp = fopen(csp->config->trustfile, "a")))
1768 char * new_entry = strdup("~");
1770 string_append(&new_entry, csp->http->hostport);
1772 path = csp->http->path;
1773 if ( (path[0] == '/')
1775 && ((path_end = strchr(path + 2, '/')) != NULL))
1777 /* since this path points into a user's home space
1778 * be sure to include this spec in the trustfile.
1780 int path_len = path_end - path; /* save offset */
1781 path = strdup(path); /* Copy string */
1784 path_end = path + path_len; /* regenerate ptr to new buffer */
1785 *(path_end + 1) = '\0'; /* Truncate path after '/' */
1787 string_join(&new_entry, path);
1791 * Give a reason for generating this entry.
1793 string_append(&new_entry, " # Trusted referrer was: ");
1794 string_append(&new_entry, referer);
1796 if (new_entry != NULL)
1798 if (-1 == fprintf(fp, "%s\n", new_entry))
1800 log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
1801 new_entry, csp->config->trustfile);
1807 /* FIXME: No way to handle out-of memory, so mostly ignoring it */
1808 log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
1815 log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
1816 csp->http->hostport, csp->config->trustfile);
1824 #endif /* def FEATURE_TRUST */
1827 /*********************************************************************
1829 * Function : pcrs_filter_response
1831 * Description : Execute all text substitutions from all applying
1832 * +filter actions on the text buffer that's been
1833 * accumulated in csp->iob->buf.
1836 * 1 : csp = Current client state (buffers, headers, etc...)
1838 * Returns : a pointer to the (newly allocated) modified buffer.
1839 * or NULL if there were no hits or something went wrong
1841 *********************************************************************/
1842 static char *pcrs_filter_response(struct client_state *csp)
1845 size_t size, prev_size;
1851 struct file_list *fl;
1852 struct re_filterfile_spec *b;
1853 struct list_entry *filtername;
1855 int i, found_filters = 0;
1860 if (csp->iob->cur >= csp->iob->eod)
1866 * Need to check the set of re_filterfiles...
1868 for (i = 0; i < MAX_AF_FILES; i++)
1881 if (0 == found_filters)
1883 log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
1884 "content filtering enabled, but no content filters available.");
1888 size = (size_t)(csp->iob->eod - csp->iob->cur);
1889 old = csp->iob->cur;
1891 for (i = 0; i < MAX_AF_FILES; i++)
1894 if ((NULL == fl) || (NULL == fl->f))
1897 * Either there are no filter files
1898 * left, or this filter file just
1899 * contains no valid filters.
1901 * Continue to be sure we don't miss
1902 * valid filter files that are chained
1903 * after empty or invalid ones.
1908 * For all applying +filter actions, look if a filter by that
1909 * name exists and if yes, execute it's pcrs_joblist on the
1912 for (b = fl->f; b; b = b->next)
1914 if (b->type != FT_CONTENT_FILTER)
1916 /* Skip header filters */
1920 for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
1921 filtername ; filtername = filtername->next)
1923 if (strcmp(b->name, filtername->str) == 0)
1925 int current_hits = 0; /* Number of hits caused by this filter */
1926 int job_number = 0; /* Which job we're currently executing */
1927 int job_hits = 0; /* How many hits the current job caused */
1928 pcrs_job *joblist = b->joblist;
1930 if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
1932 if (NULL == joblist)
1934 log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
1939 /* Apply all jobs from the joblist */
1940 for (job = joblist; NULL != job; job = job->next)
1943 job_hits = pcrs_execute(job, old, size, &new, &size);
1948 * That went well. Continue filtering
1949 * and use the result of this job as
1950 * input for the next one.
1952 current_hits += job_hits;
1953 if (old != csp->iob->cur)
1962 * This job caused an unexpected error. Inform the user
1963 * and skip the rest of the jobs in this filter. We could
1964 * continue with the next job, but usually the jobs
1965 * depend on each other or are similar enough to
1966 * fail for the same reason.
1968 * At the moment our pcrs expects the error codes of pcre 3.4,
1969 * but newer pcre versions can return additional error codes.
1970 * As a result pcrs_strerror()'s error message might be
1971 * "Unknown error ...", therefore we print the numerical value
1974 * XXX: Is this important enough for LOG_LEVEL_ERROR or
1975 * should we use LOG_LEVEL_RE_FILTER instead?
1977 log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
1978 b->name, job_number, pcrs_strerror(job_hits), job_hits);
1983 if (b->dynamic) pcrs_free_joblist(joblist);
1985 log_error(LOG_LEVEL_RE_FILTER,
1986 "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
1987 csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
1989 hits += current_hits;
1996 * If there were no hits, destroy our copy and let
1997 * chat() use the original in csp->iob
2005 csp->flags |= CSP_FLAG_MODIFIED;
2006 csp->content_length = size;
2014 /*********************************************************************
2016 * Function : gif_deanimate_response
2018 * Description : Deanimate the GIF image that has been accumulated in
2019 * csp->iob->buf, set csp->content_length to the modified
2020 * size and raise the CSP_FLAG_MODIFIED flag.
2023 * 1 : csp = Current client state (buffers, headers, etc...)
2025 * Returns : a pointer to the (newly allocated) modified buffer.
2026 * or NULL in case something went wrong.
2028 *********************************************************************/
2029 static char *gif_deanimate_response(struct client_state *csp)
2031 struct binbuffer *in, *out;
2035 size = (size_t)(csp->iob->eod - csp->iob->cur);
2037 if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
2038 || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
2040 log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
2044 in->buffer = csp->iob->cur;
2047 if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
2049 log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
2056 if ((int)size == out->offset)
2058 log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
2062 log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
2064 csp->content_length = out->offset;
2065 csp->flags |= CSP_FLAG_MODIFIED;
2075 /*********************************************************************
2077 * Function : get_filter_function
2079 * Description : Decides which content filter function has
2080 * to be applied (if any).
2083 * 1 : csp = Current client state (buffers, headers, etc...)
2085 * Returns : The content filter function to run, or
2086 * NULL if no content filter is active
2088 *********************************************************************/
2089 filter_function_ptr get_filter_function(struct client_state *csp)
2091 filter_function_ptr filter_function = NULL;
2094 * Are we enabling text mode by force?
2096 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
2099 * Do we really have to?
2101 if (csp->content_type & CT_TEXT)
2103 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
2107 csp->content_type |= CT_TEXT;
2108 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
2112 if (!(csp->content_type & CT_DECLARED))
2115 * The server didn't bother to declare a MIME-Type.
2116 * Assume it's text that can be filtered.
2118 * This also regulary happens with 304 responses,
2119 * therefore logging anything here would cause
2122 csp->content_type |= CT_TEXT;
2126 * Choose the applying filter function based on
2127 * the content type and action settings.
2129 if ((csp->content_type & CT_TEXT) &&
2130 (csp->rlist != NULL) &&
2131 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
2133 filter_function = pcrs_filter_response;
2135 else if ((csp->content_type & CT_GIF) &&
2136 (csp->action->flags & ACTION_DEANIMATE))
2138 filter_function = gif_deanimate_response;
2141 return filter_function;
2145 /*********************************************************************
2147 * Function : remove_chunked_transfer_coding
2149 * Description : In-situ remove the "chunked" transfer coding as defined
2150 * in rfc2616 from a buffer.
2153 * 1 : buffer = Pointer to the text buffer
2154 * 2 : size = In: Number of bytes to be processed,
2155 * Out: Number of bytes after de-chunking.
2156 * (undefined in case of errors)
2158 * Returns : JB_ERR_OK for success,
2159 * JB_ERR_PARSE otherwise
2161 *********************************************************************/
2162 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
2165 unsigned int chunksize = 0;
2166 char *from_p, *to_p;
2169 from_p = to_p = buffer;
2171 if (sscanf(buffer, "%x", &chunksize) != 1)
2173 log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
2174 return JB_ERR_PARSE;
2177 while (chunksize > 0)
2179 if (NULL == (from_p = strstr(from_p, "\r\n")))
2181 log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
2182 return JB_ERR_PARSE;
2185 if ((newsize += chunksize) >= *size)
2187 log_error(LOG_LEVEL_ERROR, "Chunksize exceeds buffer in \"chunked\" transfer coding");
2188 return JB_ERR_PARSE;
2192 memmove(to_p, from_p, (size_t) chunksize);
2193 to_p = buffer + newsize;
2194 from_p += chunksize + 2;
2196 if (sscanf(from_p, "%x", &chunksize) != 1)
2198 log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
2203 /* XXX: Should get its own loglevel. */
2204 log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
2213 /*********************************************************************
2215 * Function : prepare_for_filtering
2217 * Description : If necessary, de-chunks and decompresses
2218 * the content so it can get filterd.
2221 * 1 : csp = Current client state (buffers, headers, etc...)
2223 * Returns : JB_ERR_OK for success,
2224 * JB_ERR_PARSE otherwise
2226 *********************************************************************/
2227 static jb_err prepare_for_filtering(struct client_state *csp)
2229 jb_err err = JB_ERR_OK;
2232 * If the body has a "chunked" transfer-encoding,
2233 * get rid of it, adjusting size and iob->eod
2235 if (csp->flags & CSP_FLAG_CHUNKED)
2237 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
2239 log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
2240 err = remove_chunked_transfer_coding(csp->iob->cur, &size);
2241 if (JB_ERR_OK == err)
2243 csp->iob->eod = csp->iob->cur + size;
2244 csp->flags |= CSP_FLAG_MODIFIED;
2248 return JB_ERR_PARSE;
2254 * If the body has a supported transfer-encoding,
2255 * decompress it, adjusting size and iob->eod.
2257 if (csp->content_type & (CT_GZIP|CT_DEFLATE))
2259 if (0 == csp->iob->eod - csp->iob->cur)
2261 /* Nothing left after de-chunking. */
2265 err = decompress_iob(csp);
2267 if (JB_ERR_OK == err)
2269 csp->flags |= CSP_FLAG_MODIFIED;
2270 csp->content_type &= ~CT_TABOO;
2275 * Unset CT_GZIP and CT_DEFLATE to remember not
2276 * to modify the Content-Encoding header later.
2278 csp->content_type &= ~CT_GZIP;
2279 csp->content_type &= ~CT_DEFLATE;
2288 /*********************************************************************
2290 * Function : execute_content_filter
2292 * Description : Executes a given content filter.
2295 * 1 : csp = Current client state (buffers, headers, etc...)
2296 * 2 : content_filter = The filter function to execute
2298 * Returns : Pointer to the modified buffer, or
2299 * NULL if filtering failed or wasn't necessary.
2301 *********************************************************************/
2302 char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
2304 if (0 == csp->iob->eod - csp->iob->cur)
2307 * No content (probably status code 301, 302 ...),
2308 * no filtering necessary.
2313 if (JB_ERR_OK != prepare_for_filtering(csp))
2316 * failed to de-chunk or decompress.
2321 if (0 == csp->iob->eod - csp->iob->cur)
2324 * Clown alarm: chunked and/or compressed nothing delivered.
2329 return ((*content_filter)(csp));
2333 /*********************************************************************
2335 * Function : get_url_actions
2337 * Description : Gets the actions for this URL.
2340 * 1 : csp = Current client state (buffers, headers, etc...)
2341 * 2 : http = http_request request for blocked URLs
2345 *********************************************************************/
2346 void get_url_actions(struct client_state *csp, struct http_request *http)
2348 struct file_list *fl;
2349 struct url_actions *b;
2352 init_current_action(csp->action);
2354 for (i = 0; i < MAX_AF_FILES; i++)
2356 if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
2361 apply_url_actions(csp->action, http, b);
2368 /*********************************************************************
2370 * Function : apply_url_actions
2372 * Description : Applies a list of URL actions.
2375 * 1 : action = Destination.
2376 * 2 : http = Current URL
2377 * 3 : b = list of URL actions to apply
2381 *********************************************************************/
2382 void apply_url_actions(struct current_action_spec *action,
2383 struct http_request *http,
2384 struct url_actions *b)
2388 /* Should never happen */
2392 for (b = b->next; NULL != b; b = b->next)
2394 if (url_match(b->url, http))
2396 merge_current_action(action, b->action);
2402 /*********************************************************************
2404 * Function : get_forward_override_settings
2406 * Description : Returns forward settings as specified with the
2407 * forward-override{} action. forward-override accepts
2408 * forward lines similar to the one used in the
2409 * configuration file, but without the URL pattern.
2415 * in the configuration file can be replaced with
2416 * the action section:
2418 * {+forward-override{forward .}}
2422 * 1 : csp = Current client state (buffers, headers, etc...)
2424 * Returns : Pointer to forwarding structure in case of success.
2425 * Invalid syntax is fatal.
2427 *********************************************************************/
2428 const static struct forward_spec *get_forward_override_settings(struct client_state *csp)
2430 const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
2431 char forward_settings[BUFFER_SIZE];
2432 char *http_parent = NULL;
2433 /* variable names were chosen for consistency reasons. */
2434 struct forward_spec *fwd = NULL;
2438 assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
2439 /* Should be enforced by load_one_actions_file() */
2440 assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
2442 /* Create a copy ssplit can modify */
2443 strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
2445 if (NULL != csp->fwd)
2448 * XXX: Currently necessary to prevent memory
2449 * leaks when the show-url-info cgi page is visited.
2451 unload_forward_spec(csp->fwd);
2455 * allocate a new forward node, valid only for
2456 * the lifetime of this request. Save its location
2457 * in csp as well, so sweep() can free it later on.
2459 fwd = csp->fwd = zalloc(sizeof(*fwd));
2462 log_error(LOG_LEVEL_FATAL,
2463 "can't allocate memory for forward-override{%s}", forward_override_line);
2464 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2467 vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
2468 if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
2470 fwd->type = SOCKS_NONE;
2472 /* Parse the parent HTTP proxy host:port */
2473 http_parent = vec[1];
2476 else if (vec_count == 3)
2478 char *socks_proxy = NULL;
2480 if (!strcasecmp(vec[0], "forward-socks4"))
2482 fwd->type = SOCKS_4;
2483 socks_proxy = vec[1];
2485 else if (!strcasecmp(vec[0], "forward-socks4a"))
2487 fwd->type = SOCKS_4A;
2488 socks_proxy = vec[1];
2490 else if (!strcasecmp(vec[0], "forward-socks5"))
2492 fwd->type = SOCKS_5;
2493 socks_proxy = vec[1];
2496 if (NULL != socks_proxy)
2498 /* Parse the SOCKS proxy host[:port] */
2499 fwd->gateway_host = strdup(socks_proxy);
2501 if (NULL != (socks_proxy = strchr(fwd->gateway_host, ':')))
2503 *socks_proxy++ = '\0';
2504 fwd->gateway_port = strtol(socks_proxy, NULL, 0);
2507 if (fwd->gateway_port <= 0)
2509 fwd->gateway_port = 1080;
2512 http_parent = vec[2];
2516 if (NULL == http_parent)
2518 log_error(LOG_LEVEL_FATAL,
2519 "Invalid forward-override syntax in: %s", forward_override_line);
2520 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2523 /* Parse http forwarding settings */
2524 if (strcmp(http_parent, ".") != 0)
2526 fwd->forward_host = strdup(http_parent);
2528 if (NULL != (http_parent = strchr(fwd->forward_host, ':')))
2530 *http_parent++ = '\0';
2531 fwd->forward_port = strtol(http_parent, NULL, 0);
2534 if (fwd->forward_port <= 0)
2536 fwd->forward_port = 8000;
2540 assert (NULL != fwd);
2542 log_error(LOG_LEVEL_CONNECT,
2543 "Overriding forwarding settings based on \'%s\'", forward_override_line);
2549 /*********************************************************************
2551 * Function : forward_url
2553 * Description : Should we forward this to another proxy?
2556 * 1 : csp = Current client state (buffers, headers, etc...)
2557 * 2 : http = http_request request for current URL
2559 * Returns : Pointer to forwarding information.
2561 *********************************************************************/
2562 const struct forward_spec *forward_url(struct client_state *csp,
2563 const struct http_request *http)
2565 static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
2566 struct forward_spec *fwd = csp->config->forward;
2568 if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
2570 return get_forward_override_settings(csp);
2580 if (url_match(fwd->url, http))
2591 /*********************************************************************
2593 * Function : direct_response
2595 * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
2596 * request and if so, return a HTTP 501 to the client.
2598 * FIXME: I have a stupid name and I should handle the
2599 * requests properly. Still, what we do here is rfc-
2600 * compliant, whereas ignoring or forwarding are not.
2603 * 1 : csp = Current client state (buffers, headers, etc...)
2605 * Returns : http_response if , NULL if nonmatch or handler fail
2607 *********************************************************************/
2608 struct http_response *direct_response(struct client_state *csp)
2610 struct http_response *rsp;
2611 struct list_entry *p;
2613 if ((0 == strcmpic(csp->http->gpc, "trace"))
2614 || (0 == strcmpic(csp->http->gpc, "options")))
2616 for (p = csp->headers->first; (p != NULL) ; p = p->next)
2618 if (!strncmpic("Max-Forwards:", p->str, 13))
2620 unsigned int max_forwards;
2623 * If it's a Max-Forwards value of zero,
2624 * we have to intercept the request.
2626 if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
2629 * FIXME: We could handle at least TRACE here,
2630 * but that would require a verbatim copy of
2631 * the request which we don't have anymore
2633 log_error(LOG_LEVEL_HEADER,
2634 "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
2637 /* Get mem for response or fail*/
2638 if (NULL == (rsp = alloc_http_response()))
2640 return cgi_error_memory();
2643 if (NULL == (rsp->status = strdup("501 Not Implemented")))
2645 free_http_response(rsp);
2646 return cgi_error_memory();
2650 rsp->reason = RSP_REASON_UNSUPPORTED;
2652 return(finish_http_response(csp, rsp));
2661 /*********************************************************************
2663 * Function : content_filters_enabled
2665 * Description : Checks whether there are any content filters
2666 * enabled for the current request.
2669 * 1 : action = Action spec to check.
2671 * Returns : TRUE for yes, FALSE otherwise
2673 *********************************************************************/
2674 int content_filters_enabled(const struct current_action_spec *action)
2676 return ((action->flags & ACTION_DEANIMATE) ||
2677 !list_is_empty(action->multi[ACTION_MULTI_FILTER]));