1 const char filters_rcs[] = "$Id: filters.c,v 1.106 2008/05/03 16:40:44 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 1.106 2008/05/03 16:40:44 fabiankeil
44 * Change content_filters_enabled()'s parameter from
45 * csp->action to action so it can be also used in the
46 * CGI code. Don't bother checking if there are filters
47 * loaded, as that's somewhat besides the point.
49 * Revision 1.105 2008/03/28 15:13:39 fabiankeil
50 * Remove inspect-jpegs action.
52 * Revision 1.104 2008/03/27 18:27:24 fabiankeil
53 * Remove kill-popups action.
55 * Revision 1.103 2008/03/06 16:33:45 fabiankeil
56 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
58 * Revision 1.102 2008/03/01 14:00:44 fabiankeil
59 * Let the block action take the reason for the block
60 * as argument and show it on the "blocked" page.
62 * Revision 1.101 2008/02/23 16:57:12 fabiankeil
63 * Rename url_actions() to get_url_actions() and let it
64 * use the standard parameter ordering.
66 * Revision 1.100 2008/02/23 16:33:43 fabiankeil
67 * Let forward_url() use the standard parameter ordering
68 * and mark its second parameter immutable.
70 * Revision 1.99 2008/02/03 13:57:58 fabiankeil
71 * Add SOCKS5 support for forward-override{}.
73 * Revision 1.98 2008/01/04 17:43:45 fabiankeil
74 * Improve the warning messages that get logged if the action files
75 * "enable" filters but no filters of that type have been loaded.
77 * Revision 1.97 2007/11/30 15:37:03 fabiankeil
78 * Use freez instead of free.
80 * Revision 1.96 2007/10/19 16:53:28 fabiankeil
81 * Add helper function to check if any content filters are enabled.
83 * Revision 1.95 2007/10/17 19:31:20 fabiankeil
84 * Omitting the zero chunk that ends the chunk transfer encoding seems
85 * to be the new black. Log the problem and continue filtering anyway.
87 * Revision 1.94 2007/09/29 13:20:20 fabiankeil
88 * Remove two redundant and one useless log messages.
90 * Revision 1.93 2007/09/29 10:21:16 fabiankeil
91 * - Move get_filter_function() from jcc.c to filters.c
92 * so the filter functions can be static.
93 * - Don't bother filtering body-less responses.
95 * Revision 1.92 2007/09/28 16:38:55 fabiankeil
96 * - Execute content filters through execute_content_filter().
97 * - Add prepare_for_filtering() so filter functions don't have to
98 * care about de-chunking and decompression. As a side effect this enables
99 * decompression for gif_deanimate_response() and jpeg_inspect_response().
100 * - Change remove_chunked_transfer_coding()'s return type to jb_err.
101 * Some clowns feel like chunking empty responses in which case
102 * (size == 0) is valid but previously would be interpreted as error.
104 * Revision 1.91 2007/09/02 15:31:20 fabiankeil
105 * Move match_portlist() from filter.c to urlmatch.c.
106 * It's used for url matching, not for filtering.
108 * Revision 1.90 2007/09/02 12:44:17 fabiankeil
109 * Remove newline at the end of a log_error() message.
111 * Revision 1.89 2007/08/05 13:42:23 fabiankeil
112 * #1763173 from Stefan Huehner: declare some more functions static.
114 * Revision 1.88 2007/06/01 16:41:11 fabiankeil
115 * Add forward-override{} to change the forwarding settings through
116 * action sections. This is mainly interesting to forward different
117 * clients differently (for example based on User-Agent or request
120 * Revision 1.87 2007/04/30 15:53:10 fabiankeil
121 * Make sure filters with dynamic jobs actually use them.
123 * Revision 1.86 2007/04/30 15:03:28 fabiankeil
124 * - Introduce dynamic pcrs jobs that can resolve variables.
125 * - Don't run redirect functions more than once,
126 * unless they are activated more than once.
128 * Revision 1.85 2007/03/21 12:24:47 fabiankeil
129 * - Log the content size after decompression in decompress_iob()
130 * instead of pcrs_filter_response().
132 * Revision 1.84 2007/03/20 15:16:34 fabiankeil
133 * Use dedicated header filter actions instead of abusing "filter".
134 * Replace "filter-client-headers" and "filter-client-headers"
135 * with "server-header-filter" and "client-header-filter".
137 * Revision 1.83 2007/03/17 15:20:05 fabiankeil
138 * New config option: enforce-blocks.
140 * Revision 1.82 2007/03/13 11:28:43 fabiankeil
141 * - Fix port handling in acl_addr() and use a temporary acl spec
142 * copy so error messages don't contain a truncated version.
143 * - Log size of iob before and after decompression.
145 * Revision 1.81 2007/03/05 14:40:53 fabiankeil
146 * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
147 * - Hide the "Go there anyway" link for blocked CONNECT
148 * requests where going there anyway doesn't work anyway.
150 * Revision 1.80 2007/02/07 10:55:20 fabiankeil
151 * - Save the reason for generating http_responses.
152 * - Block (+block) with status code 403 instead of 404.
153 * - Use a different kludge to remember a failed decompression.
155 * Revision 1.79 2007/01/31 16:21:38 fabiankeil
156 * Search for Max-Forwards headers case-insensitive,
157 * don't generate the "501 unsupported" message for invalid
158 * Max-Forwards values and don't increase negative ones.
160 * Revision 1.78 2007/01/28 13:41:18 fabiankeil
161 * - Add HEAD support to finish_http_response.
162 * - Add error favicon to internal HTML error messages.
164 * Revision 1.77 2007/01/12 15:36:44 fabiankeil
165 * Mark *csp as immutable for is_untrusted_url()
166 * and is_imageurl(). Closes FR 1237736.
168 * Revision 1.76 2007/01/01 19:36:37 fabiankeil
169 * Integrate a modified version of Wil Mahan's
170 * zlib patch (PR #895531).
172 * Revision 1.75 2006/12/29 18:30:46 fabiankeil
173 * Fixed gcc43 conversion warnings,
174 * changed sprintf calls to snprintf.
176 * Revision 1.74 2006/12/24 17:37:38 fabiankeil
177 * Adjust comment in pcrs_filter_response()
178 * to recent pcrs changes. Hohoho.
180 * Revision 1.73 2006/12/23 16:01:02 fabiankeil
181 * Don't crash if pcre returns an error code
182 * that pcrs didn't expect. Fixes BR 1621173.
184 * Revision 1.72 2006/12/22 18:52:53 fabiankeil
185 * Modified is_untrusted_url to complain in case of
186 * write errors and to give a reason when adding new
187 * entries to the trustfile. Closes FR 1097611.
189 * Revision 1.71 2006/12/22 14:24:52 fabiankeil
190 * Skip empty filter files in pcrs_filter_response,
191 * but don't ignore the ones that come afterwards.
192 * Fixes parts of BR 1619208.
194 * Revision 1.70 2006/12/09 13:33:15 fabiankeil
195 * Added some sanity checks for get_last_url().
196 * Fixed possible segfault caused by my last commit.
198 * Revision 1.69 2006/12/08 12:39:13 fabiankeil
199 * Let get_last_url() catch https URLs as well.
201 * Revision 1.68 2006/12/05 14:45:48 fabiankeil
202 * Make sure get_last_url() behaves like advertised
203 * and fast-redirects{} can be combined with redirect{}.
205 * Revision 1.67 2006/11/28 15:19:43 fabiankeil
206 * Implemented +redirect{s@foo@bar@} to generate
207 * a redirect based on a rewritten version of the
210 * Revision 1.66 2006/09/23 13:26:38 roro
211 * Replace TABs by spaces in source code.
213 * Revision 1.65 2006/09/21 12:54:43 fabiankeil
214 * Fix +redirect{}. Didn't work with -fast-redirects.
216 * Revision 1.64 2006/08/31 10:55:49 fabiankeil
217 * Block requests for untrusted URLs with status
218 * code 403 instead of 200.
220 * Revision 1.63 2006/08/31 10:11:28 fabiankeil
221 * Don't free p which is still in use and will be later
222 * freed by free_map(). Don't claim the referrer is unknown
223 * when the client didn't set one.
225 * Revision 1.62 2006/08/14 00:27:47 david__schmidt
226 * Feature request 595948: Re-Filter logging in single line
228 * Revision 1.61 2006/08/03 02:46:41 david__schmidt
229 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
231 * Revision 1.60 2006/07/18 14:48:46 david__schmidt
232 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
233 * with what was really the latest development (the v_3_0_branch branch)
235 * Revision 1.58.2.9 2006/01/29 23:10:56 david__schmidt
236 * Multiple filter file support
238 * Revision 1.58.2.8 2005/05/07 21:50:55 david__schmidt
239 * A few memory leaks plugged (mostly on error paths)
241 * Revision 1.58.2.7 2004/10/03 12:53:32 david__schmidt
242 * Add the ability to check jpeg images for invalid
243 * lengths of comment blocks. Defensive strategy
244 * against the exploit:
245 * Microsoft Security Bulletin MS04-028
246 * Buffer Overrun in JPEG Processing (GDI+) Could
247 * Allow Code Execution (833987)
248 * Enabled with +inspect-jpegs in actions files.
250 * Revision 1.58.2.6 2003/12/06 22:18:27 gliptak
251 * Correcting compile problem with FEATURE_IMAGE_BLOCKING
253 * Revision 1.58.2.5 2003/11/11 13:10:31 oes
254 * Fixed bug #839859: "See why" link URL now gets url-encoded.
256 * Revision 1.58.2.4 2003/02/28 12:52:45 oes
259 * Revision 1.58.2.3 2002/09/25 14:51:51 oes
260 * Added basic support for OPTIONS and TRACE HTTP methods:
261 * New function direct_response which handles OPTIONS and
262 * TRACE requests whose Max-Forwards header field is zero.
264 * Revision 1.58.2.2 2002/08/01 17:18:28 oes
265 * Fixed BR 537651 / SR 579724 (MSIE image detect improper for IE/Mac)
267 * Revision 1.58.2.1 2002/07/26 15:18:53 oes
268 * - Bugfix: Executing a filters without jobs no longer results in
269 * turing off *all* filters.
270 * - Security fix: Malicious web servers can't cause a seg fault
271 * through bogus chunk sizes anymore
273 * Revision 1.58 2002/04/24 02:11:17 oes
274 * Jon's multiple AF patch: url_actions now evaluates rules
277 * Revision 1.57 2002/04/08 20:38:34 swa
280 * Revision 1.56 2002/04/05 15:51:24 oes
281 * - bugfix: error-pages now get correct request protocol
282 * - fix for invalid HTML in trust info
284 * Revision 1.55 2002/04/02 16:13:51 oes
285 * Fix: No "Go there anyway" for SSL
287 * Revision 1.54 2002/04/02 14:55:56 oes
288 * Bugfix: is_untrusted_url() now depends on FEATURE_TRUST, not FEATURE_COOKIE_JAR
290 * Revision 1.53 2002/03/26 22:29:54 swa
291 * we have a new homepage!
293 * Revision 1.52 2002/03/24 16:35:57 jongfoster
296 * Revision 1.51 2002/03/24 15:23:33 jongfoster
299 * Revision 1.50 2002/03/24 13:25:43 swa
300 * name change related issues
302 * Revision 1.49 2002/03/16 20:29:14 oes
305 * Revision 1.48 2002/03/13 20:25:34 oes
306 * Better logging for content filters
308 * Revision 1.47 2002/03/13 00:30:52 jongfoster
310 * Added option of always sending redirect for imageblock,
311 * currently disabled with #if 0.
313 * Revision 1.46 2002/03/12 01:42:49 oes
314 * Introduced modular filters
316 * Revision 1.45 2002/03/08 16:47:50 oes
317 * Added choice beween GIF and PNG built-in images
319 * Revision 1.44 2002/03/07 03:49:31 oes
320 * - Fixed compiler warnings etc
321 * - Changed built-in images from GIF to PNG
322 * (with regard to Unisys patent issue)
323 * - Added a 4x4 pattern PNG which is less intrusive
324 * than the logo but also clearly marks the deleted banners
326 * Revision 1.43 2002/01/22 23:51:59 jongfoster
327 * Replacing strsav() with the safer string_append().
329 * Adding missing html_encode() to error message generators. Where encoded
330 * and unencoded versions of a string were provided, removing the unencoded
333 * Revision 1.42 2002/01/17 21:00:32 jongfoster
334 * Moving all our URL and URL pattern parsing code to urlmatch.c.
336 * Using a single, simple url_match(pattern,url) function - rather than
337 * the 3-line match routine which was repeated all over the place.
339 * Renaming free_url to free_url_spec, since it frees a struct url_spec.
341 * Using parse_http_url() to parse URLs without faking a HTTP
342 * request line for parse_http_request().
344 * Revision 1.41 2001/11/13 00:14:07 jongfoster
345 * Fixing stupid bug now I've figured out what || means.
346 * (It always returns 0 or 1, not one of it's paramaters.)
348 * Revision 1.40 2001/10/26 17:37:55 oes
349 * - Re-enabled Netscape 200/404 bug workaround in block_url():
350 * - Removed OS/2 special case
351 * - Made block_url() independant from sed() having been run
352 * - Made trust_url independant from sed() having been run
353 * - Made is_imageurl independant from sed() having been run.
354 * It now checks User-Agent: and Accept: by itself.
357 * Revision 1.39 2001/10/25 03:40:48 david__schmidt
358 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
359 * threads to call select() simultaneously. So, it's time to do a real, live,
360 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
361 * (native). Both versions will work, but using __OS2__ offers multi-threading.
363 * Revision 1.38 2001/10/23 21:32:33 jongfoster
364 * Adding error-checking to selected functions
366 * Revision 1.37 2001/10/22 15:33:56 david__schmidt
367 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
368 * filters.c. Added a FIXME in front of the offending code. I'll gladly
369 * put in a better/more robust fix for all parties if one is presented...
370 * It seems that just returning 200 instead of 404 would pretty much fix
371 * it for everyone, but I don't know all the history of the problem.
373 * Revision 1.36 2001/10/10 16:44:16 oes
374 * Added match_portlist function
376 * Revision 1.35 2001/10/07 15:41:23 oes
377 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
379 * New function remove_chunked_transfer_coding that strips chunked
380 * transfer coding to plain and is called by pcrs_filter_response
381 * and gif_deanimate_response if neccessary
383 * Improved handling of zero-change re_filter runs
385 * pcrs_filter_response and gif_deanimate_response now remove
386 * chunked transfer codeing before processing the body.
388 * Revision 1.34 2001/09/20 15:49:36 steudten
390 * Fix BUG: Change int size to size_t size in pcrs_filter_response().
391 * See cgi.c fill_template().
393 * Revision 1.33 2001/09/16 17:05:14 jongfoster
394 * Removing unused #include showarg.h
396 * Revision 1.32 2001/09/16 13:21:27 jongfoster
397 * Changes to use new list functions.
399 * Revision 1.31 2001/09/16 11:38:02 jongfoster
400 * Splitting fill_template() into 2 functions:
401 * template_load() loads the file
402 * template_fill() performs the PCRS regexps.
403 * This is because the CGI edit interface has a "table row"
404 * template which is used many times in the page - this
405 * change means it's only loaded from disk once.
407 * Revision 1.30 2001/09/16 11:00:10 jongfoster
408 * New function alloc_http_response, for symmetry with free_http_response
410 * Revision 1.29 2001/09/13 23:32:40 jongfoster
411 * Moving image data to cgi.c rather than cgi.h
412 * Fixing a GPF under Win32 (and any other OS that protects global
413 * constants from being written to).
415 * Revision 1.28 2001/09/10 10:18:51 oes
416 * Silenced compiler warnings
418 * Revision 1.27 2001/08/05 16:06:20 jongfoster
419 * Modifiying "struct map" so that there are now separate header and
420 * "map_entry" structures. This means that functions which modify a
421 * map no longer need to return a pointer to the modified map.
422 * Also, it no longer reverses the order of the entries (which may be
423 * important with some advanced template substitutions).
425 * Revision 1.26 2001/07/30 22:08:36 jongfoster
426 * Tidying up #defines:
427 * - All feature #defines are now of the form FEATURE_xxx
428 * - Permanently turned off WIN_GUI_EDIT
429 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
431 * Revision 1.25 2001/07/26 10:09:46 oes
432 * Made browser detection a little less naive
434 * Revision 1.24 2001/07/25 17:22:51 oes
435 * Added workaround for Netscape bug that prevents display of page when loading a component fails.
437 * Revision 1.23 2001/07/23 13:40:12 oes
438 * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
440 * Revision 1.22 2001/07/18 12:29:34 oes
441 * - Made gif_deanimate_response respect
442 * csp->action->string[ACTION_STRING_DEANIMATE]
443 * - Logging cosmetics
445 * Revision 1.21 2001/07/13 13:59:53 oes
446 * - Introduced gif_deanimate_response which shares the
447 * generic content modification interface of pcrs_filter_response
448 * and acts as a wrapper to deanimate.c:gif_deanimate()
449 * - Renamed re_process_buffer to pcrs_filter_response
450 * - pcrs_filter_response now returns NULL on failiure
451 * - Removed all #ifdef PCRS
453 * Revision 1.20 2001/07/01 17:01:04 oes
454 * Added comments and missing return statement in is_untrusted_url()
456 * Revision 1.19 2001/06/29 21:45:41 oes
457 * Indentation, CRLF->LF, Tab-> Space
459 * Revision 1.18 2001/06/29 13:27:38 oes
460 * - Cleaned up, renamed and reorderd functions
461 * and improved comments
464 * - Ported to CGI platform. Now delivers
465 * http_response or NULL
466 * - Unified HTML and GIF generation (moved image detection
467 * and GIF generation here from jcc.c:chat())
468 * - Fixed HTTP status to:
469 * - 403 (Forbidden) for the "blocked" HTML message
470 * - 200 (OK) for GIF answers
471 * - 302 (Redirect) for redirect to GIF
474 * - Ported to CGI platform. Now delivers
475 * http_response or NULL
476 * - Separated detection of untrusted URL into
477 * (bool)is_untrusted_url
478 * - Added enforcement of untrusted requests
480 * - Moved redirect_url() from cgi.c to here
481 * and ported it to the CGI platform
483 * - Removed logentry from cancelled commit
485 * Revision 1.17 2001/06/09 10:55:28 jongfoster
486 * Changing BUFSIZ ==> BUFFER_SIZE
488 * Revision 1.16 2001/06/07 23:10:26 jongfoster
489 * Allowing unanchored domain patterns to back off and retry
490 * if they partially match. Optimized right-anchored patterns.
491 * Moving ACL and forward files into config file.
492 * Replacing struct gateway with struct forward_spec
494 * Revision 1.15 2001/06/03 19:12:00 oes
495 * extracted-CGI relevant stuff
497 * Revision 1.14 2001/06/01 10:30:55 oes
498 * Added optional left-anchoring to domaincmp
500 * Revision 1.13 2001/05/31 21:21:30 jongfoster
501 * Permissionsfile / actions file changes:
502 * - Changed "permission" to "action" throughout
503 * - changes to file format to allow string parameters
504 * - Moved helper functions to actions.c
506 * Revision 1.12 2001/05/31 17:35:20 oes
508 * - Enhanced domain part globbing with infix and prefix asterisk
509 * matching and optional unanchored operation
511 * Revision 1.11 2001/05/29 11:53:23 oes
512 * "See why" link added to "blocked" page
514 * Revision 1.10 2001/05/29 09:50:24 jongfoster
515 * Unified blocklist/imagelist/permissionslist.
516 * File format is still under discussion, but the internal changes
519 * Also modified interceptor behaviour:
520 * - We now intercept all URLs beginning with one of the following
521 * prefixes (and *only* these prefixes):
523 * * http://ijbswa.sf.net/config/
524 * * http://ijbswa.sourceforge.net/config/
525 * - New interceptors "home page" - go to http://i.j.b/ to see it.
526 * - Internal changes so that intercepted and fast redirect pages
527 * are not replaced with an image.
528 * - Interceptors now have the option to send a binary page direct
529 * to the client. (i.e. ijb-send-banner uses this)
530 * - Implemented show-url-info interceptor. (Which is why I needed
531 * the above interceptors changes - a typical URL is
532 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
533 * The previous mechanism would not have intercepted that, and
534 * if it had been intercepted then it then it would have replaced
537 * Revision 1.9 2001/05/27 22:17:04 oes
539 * - re_process_buffer no longer writes the modified buffer
540 * to the client, which was very ugly. It now returns the
541 * buffer, which it is then written by chat.
543 * - content_length now adjusts the Content-Length: header
544 * for modified documents rather than crunch()ing it.
545 * (Length info in csp->content_length, which is 0 for
546 * unmodified documents)
548 * - For this to work, sed() is called twice when filtering.
550 * Revision 1.8 2001/05/26 17:13:28 jongfoster
551 * Filled in a function comment.
553 * Revision 1.7 2001/05/26 15:26:15 jongfoster
554 * ACL feature now provides more security by immediately dropping
555 * connections from untrusted hosts.
557 * Revision 1.6 2001/05/26 00:28:36 jongfoster
558 * Automatic reloading of config file.
559 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
560 * Most of the global variables have been moved to a new
561 * struct configuration_spec, accessed through csp->config->globalname
562 * Most of the globals remaining are used by the Win32 GUI.
564 * Revision 1.5 2001/05/25 22:34:30 jongfoster
567 * Revision 1.4 2001/05/22 18:46:04 oes
569 * - Enabled filtering banners by size rather than URL
570 * by adding patterns that replace all standard banner
571 * sizes with the "Junkbuster" gif to the re_filterfile
573 * - Enabled filtering WebBugs by providing a pattern
574 * which kills all 1x1 images
576 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
577 * which is selected by the (nonstandard and therefore
578 * capital) letter 'U' in the option string.
579 * It causes the quantifiers to be ungreedy by default.
580 * Appending a ? turns back to greedy (!).
582 * - Added a new interceptor ijb-send-banner, which
583 * sends back the "Junkbuster" gif. Without imagelist or
584 * MSIE detection support, or if tinygif = 1, or the
585 * URL isn't recognized as an imageurl, a lame HTML
586 * explanation is sent instead.
588 * - Added new feature, which permits blocking remote
589 * script redirects and firing back a local redirect
591 * The feature is conditionally compiled, i.e. it
592 * can be disabled with --disable-fast-redirects,
593 * plus it must be activated by a "fast-redirects"
594 * line in the config file, has its own log level
595 * and of course wants to be displayed by show-proxy-args
596 * Note: Boy, all the #ifdefs in 1001 locations and
597 * all the fumbling with configure.in and acconfig.h
598 * were *way* more work than the feature itself :-(
600 * - Because a generic redirect template was needed for
601 * this, tinygif = 3 now uses the same.
603 * - Moved GIFs, and other static HTTP response templates
608 * - Removed some >400 CRs again (Jon, you really worked
611 * Revision 1.3 2001/05/20 16:44:47 jongfoster
612 * Removing last hardcoded Junkbusters.com URLs.
614 * Revision 1.2 2001/05/20 01:21:20 jongfoster
615 * Version 2.9.4 checkin.
616 * - Merged popupfile and cookiefile, and added control over PCRS
617 * filtering, in new "permissionsfile".
618 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
619 * file error you now get a message box (in the Win32 GUI) rather
620 * than the program exiting with no explanation.
621 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
623 * - Removed tabs from "config"
624 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
625 * - Bumped up version number.
627 * Revision 1.1.1.1 2001/05/15 13:58:52 oes
628 * Initial import of version 2.9.3 source tree
631 *********************************************************************/
637 #include <sys/types.h>
646 #endif /* ndef __OS2__ */
647 #include <netinet/in.h>
649 #include <winsock2.h>
650 #endif /* ndef _WIN32 */
654 #endif /* def __OS2__ */
662 #include "jbsockets.h"
663 #include "miscutil.h"
667 #include "deanimate.h"
668 #include "urlmatch.h"
675 const char filters_h_rcs[] = FILTERS_H_VERSION;
677 /* Fix a problem with Solaris. There should be no effect on other
679 * Solaris's isspace() is a macro which uses it's argument directly
680 * as an array index. Therefore we need to make sure that high-bit
681 * characters generate +ve values, and ideally we also want to make
682 * the argument match the declared parameter type of "int".
684 #define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
686 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
687 static jb_err prepare_for_filtering(struct client_state *csp);
690 /*********************************************************************
692 * Function : block_acl
694 * Description : Block this request?
695 * Decide yes or no based on ACL file.
698 * 1 : dst = The proxy or gateway address this is going to.
699 * Or NULL to check all possible targets.
700 * 2 : csp = Current client state (buffers, headers, etc...)
701 * Also includes the client IP address.
703 * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
705 *********************************************************************/
706 int block_acl(struct access_control_addr *dst, struct client_state *csp)
708 struct access_control_list *acl = csp->config->acl;
710 /* if not using an access control list, then permit the connection */
716 /* search the list */
719 if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
723 /* Just want to check if they have any access */
724 if (acl->action == ACL_PERMIT)
729 else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
730 && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
732 if (acl->action == ACL_PERMIT)
750 /*********************************************************************
752 * Function : acl_addr
754 * Description : Called from `load_config' to parse an ACL address.
757 * 1 : aspec = String specifying ACL address.
758 * 2 : aca = struct access_control_addr to fill in.
760 * Returns : 0 => Ok, everything else is an error.
762 *********************************************************************/
763 int acl_addr(const char *aspec, struct access_control_addr *aca)
768 char *acl_spec = NULL;
774 * Use a temporary acl spec copy so we can log
775 * the unmodified original in case of parse errors.
777 acl_spec = strdup(aspec);
778 if (acl_spec == NULL)
780 /* XXX: This will be logged as parse error. */
784 if ((p = strchr(acl_spec, '/')) != NULL)
787 if (ijb_isdigit(*p) == 0)
792 masklength = atoi(p);
795 if ((masklength < 0) || (masklength > 32))
801 if ((p = strchr(acl_spec, ':')) != NULL)
806 port = strtol(p, &endptr, 10);
808 if (port <= 0 || port > 65535 || *endptr != '\0')
815 aca->port = (unsigned long)port;
817 aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
820 if (aca->addr == INADDR_NONE)
822 /* XXX: This will be logged as parse error. */
826 /* build the netmask */
828 for (i=1; i <= masklength ; i++)
830 aca->mask |= (1 << (32 - i));
833 /* now mask off the host portion of the ip address
834 * (i.e. save on the network portion of the address).
836 aca->addr = aca->addr & aca->mask;
841 #endif /* def FEATURE_ACL */
844 /*********************************************************************
846 * Function : connect_port_is_forbidden
848 * Description : Check to see if CONNECT requests to the destination
849 * port of this request are forbidden. The check is
850 * independend of the actual request method.
853 * 1 : csp = Current client state (buffers, headers, etc...)
855 * Returns : True if yes, false otherwise.
857 *********************************************************************/
858 int connect_port_is_forbidden(const struct client_state *csp)
860 return ((csp->action->flags & ACTION_LIMIT_CONNECT) &&
861 !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT],
866 /*********************************************************************
868 * Function : block_url
870 * Description : Called from `chat'. Check to see if we need to block this.
873 * 1 : csp = Current client state (buffers, headers, etc...)
875 * Returns : NULL => unblocked, else HTTP block response
877 *********************************************************************/
878 struct http_response *block_url(struct client_state *csp)
880 struct http_response *rsp;
881 const char *new_content_type = NULL;
884 * If it's not blocked, don't block it ;-)
886 if ((csp->action->flags & ACTION_BLOCK) == 0)
890 if (csp->action->flags & ACTION_REDIRECT)
892 log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
895 * Else, prepare a response
897 if (NULL == (rsp = alloc_http_response()))
899 return cgi_error_memory();
903 * If it's an image-url, send back an image or redirect
904 * as specified by the relevant +image action
906 #ifdef FEATURE_IMAGE_BLOCKING
907 if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
911 /* determine HOW images should be blocked */
912 p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
914 if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
916 log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
918 #if 1 /* Two alternative strategies, use this one for now: */
920 /* and handle accordingly: */
921 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
923 rsp->status = strdup("403 Request blocked by Privoxy");
924 if (rsp->status == NULL)
926 free_http_response(rsp);
927 return cgi_error_memory();
929 rsp->body = bindup(image_pattern_data, image_pattern_length);
930 if (rsp->body == NULL)
932 free_http_response(rsp);
933 return cgi_error_memory();
935 rsp->content_length = image_pattern_length;
937 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
939 free_http_response(rsp);
940 return cgi_error_memory();
944 else if (0 == strcmpic(p, "blank"))
946 rsp->status = strdup("403 Request blocked by Privoxy");
947 if (rsp->status == NULL)
949 free_http_response(rsp);
950 return cgi_error_memory();
952 rsp->body = bindup(image_blank_data, image_blank_length);
953 if (rsp->body == NULL)
955 free_http_response(rsp);
956 return cgi_error_memory();
958 rsp->content_length = image_blank_length;
960 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
962 free_http_response(rsp);
963 return cgi_error_memory();
969 rsp->status = strdup("302 Local Redirect from Privoxy");
970 if (rsp->status == NULL)
972 free_http_response(rsp);
973 return cgi_error_memory();
976 if (enlist_unique_header(rsp->headers, "Location", p))
978 free_http_response(rsp);
979 return cgi_error_memory();
983 #else /* Following code is disabled for now */
985 /* and handle accordingly: */
986 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
988 p = CGI_PREFIX "send-banner?type=pattern";
990 else if (0 == strcmpic(p, "blank"))
992 p = CGI_PREFIX "send-banner?type=blank";
994 rsp->status = strdup("302 Local Redirect from Privoxy");
995 if (rsp->status == NULL)
997 free_http_response(rsp);
998 return cgi_error_memory();
1001 if (enlist_unique_header(rsp->headers, "Location", p))
1003 free_http_response(rsp);
1004 return cgi_error_memory();
1006 #endif /* Preceeding code is disabled for now */
1008 else if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
1011 * Send empty document.
1013 new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
1016 rsp->body = strdup(" ");
1017 rsp->content_length = 1;
1019 rsp->status = strdup("403 Request blocked by Privoxy");
1020 if (rsp->status == NULL)
1022 free_http_response(rsp);
1023 return cgi_error_memory();
1025 if (new_content_type != 0)
1027 log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
1028 if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
1030 free_http_response(rsp);
1031 return cgi_error_memory();
1036 #endif /* def FEATURE_IMAGE_BLOCKING */
1039 * Else, generate an HTML "blocked" message:
1043 struct map * exports;
1047 * Workaround for stupid Netscape bug which prevents
1048 * pages from being displayed if loading a referenced
1049 * JavaScript or style sheet fails. So make it appear
1050 * as if it succeeded.
1052 if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
1053 && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
1054 && !strstr(p, "Gecko") /* save Mozilla, */
1055 && !strstr(p, "compatible") /* MSIE */
1056 && !strstr(p, "Opera")) /* and Opera. */
1058 rsp->status = strdup("200 Request for blocked URL");
1062 rsp->status = strdup("403 Request for blocked URL");
1065 if (rsp->status == NULL)
1067 free_http_response(rsp);
1068 return cgi_error_memory();
1071 exports = default_exports(csp, NULL);
1072 if (exports == NULL)
1074 free_http_response(rsp);
1075 return cgi_error_memory();
1078 #ifdef FEATURE_FORCE_LOAD
1079 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1081 * Export the force conditional block killer if
1083 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1084 * - Privoxy is configured to enforce blocks, or
1085 * - it's a CONNECT request and enforcing wouldn't work anyway.
1087 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1088 || (0 == strcmpic(csp->http->gpc, "connect")))
1089 #endif /* ndef FEATURE_FORCE_LOAD */
1091 err = map_block_killer(exports, "force-support");
1094 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1095 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
1096 if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
1097 if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
1100 const char *block_reason;
1101 if (csp->action->string[ACTION_STRING_BLOCK] != NULL)
1103 block_reason = csp->action->string[ACTION_STRING_BLOCK];
1107 assert(connect_port_is_forbidden(csp));
1108 block_reason = "Forbidden CONNECT port.";
1110 err = map(exports, "block-reason", 1, html_encode(block_reason), 0);
1115 free_http_response(rsp);
1116 return cgi_error_memory();
1119 err = template_fill_for_cgi(csp, "blocked", exports, rsp);
1122 free_http_response(rsp);
1123 return cgi_error_memory();
1126 rsp->reason = RSP_REASON_BLOCKED;
1128 return finish_http_response(csp, rsp);
1133 #ifdef FEATURE_TRUST
1134 /*********************************************************************
1136 * Function : trust_url FIXME: I should be called distrust_url
1138 * Description : Calls is_untrusted_url to determine if the URL is trusted
1139 * and if not, returns a HTTP 403 response with a reject message.
1142 * 1 : csp = Current client state (buffers, headers, etc...)
1144 * Returns : NULL => trusted, else http_response.
1146 *********************************************************************/
1147 struct http_response *trust_url(struct client_state *csp)
1149 struct http_response *rsp;
1150 struct map * exports;
1151 char buf[BUFFER_SIZE];
1153 struct url_spec **tl;
1158 * Don't bother to work on trusted URLs
1160 if (!is_untrusted_url(csp))
1166 * Else, prepare a response:
1168 if (NULL == (rsp = alloc_http_response()))
1170 return cgi_error_memory();
1173 rsp->status = strdup("403 Request blocked by Privoxy");
1174 exports = default_exports(csp, NULL);
1175 if (exports == NULL || rsp->status == NULL)
1177 free_http_response(rsp);
1178 return cgi_error_memory();
1182 * Export the protocol, host, port, and referrer information
1184 err = map(exports, "hostport", 1, csp->http->hostport, 1);
1185 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1186 if (!err) err = map(exports, "path", 1, csp->http->path, 1);
1188 if (NULL != (p = get_header_value(csp->headers, "Referer:")))
1190 if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
1194 if (!err) err = map(exports, "referrer", 1, "none set", 1);
1200 free_http_response(rsp);
1201 return cgi_error_memory();
1205 * Export the trust list
1208 for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
1210 snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
1211 string_append(&p, buf);
1213 err = map(exports, "trusted-referrers", 1, p, 0);
1218 free_http_response(rsp);
1219 return cgi_error_memory();
1223 * Export the trust info, if available
1225 if (csp->config->trust_info->first)
1227 struct list_entry *l;
1230 for (l = csp->config->trust_info->first; l ; l = l->next)
1232 snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
1233 string_append(&p, buf);
1235 err = map(exports, "trust-info", 1, p, 0);
1239 err = map_block_killer(exports, "have-trust-info");
1245 free_http_response(rsp);
1246 return cgi_error_memory();
1250 * Export the force conditional block killer if
1252 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1253 * - Privoxy is configured to enforce blocks, or
1254 * - it's a CONNECT request and enforcing wouldn't work anyway.
1256 #ifdef FEATURE_FORCE_LOAD
1257 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1258 || (0 == strcmpic(csp->http->gpc, "connect")))
1260 err = map_block_killer(exports, "force-support");
1264 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1266 #else /* ifndef FEATURE_FORCE_LOAD */
1267 err = map_block_killer(exports, "force-support");
1268 #endif /* ndef FEATURE_FORCE_LOAD */
1273 free_http_response(rsp);
1274 return cgi_error_memory();
1278 * Build the response
1280 err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
1283 free_http_response(rsp);
1284 return cgi_error_memory();
1286 rsp->reason = RSP_REASON_UNTRUSTED;
1288 return finish_http_response(csp, rsp);
1290 #endif /* def FEATURE_TRUST */
1293 /*********************************************************************
1295 * Function : compile_dynamic_pcrs_job_list
1297 * Description : Compiles a dynamic pcrs job list (one with variables
1298 * resolved at request time)
1301 * 1 : csp = Current client state (buffers, headers, etc...)
1302 * 2 : b = The filter list to compile
1304 * Returns : NULL in case of errors, otherwise the
1307 *********************************************************************/
1308 pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
1310 struct list_entry *pattern;
1311 pcrs_job *job_list = NULL;
1312 pcrs_job *dummy = NULL;
1313 pcrs_job *lastjob = NULL;
1316 const struct pcrs_variable variables[] =
1318 {"url", csp->http->url, 1},
1319 {"path", csp->http->path, 1},
1320 {"host", csp->http->host, 1},
1321 {"origin", csp->ip_addr_str, 1},
1325 for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
1327 assert(pattern->str != NULL);
1329 dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
1333 log_error(LOG_LEVEL_ERROR,
1334 "Adding filter job \'%s\' to dynamic filter %s failed: %s",
1335 pattern->str, b->name, pcrs_strerror(error));
1340 if (error == PCRS_WARN_TRUNCATION)
1342 log_error(LOG_LEVEL_ERROR,
1343 "At least one of the variables in \'%s\' had to "
1344 "be truncated before compilation", pattern->str);
1346 if (job_list == NULL)
1352 lastjob->next = dummy;
1362 /*********************************************************************
1364 * Function : rewrite_url
1366 * Description : Rewrites a URL with a single pcrs command
1367 * and returns the result if it differs from the
1368 * original and isn't obviously invalid.
1371 * 1 : old_url = URL to rewrite.
1372 * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
1375 * Returns : NULL if the pcrs_command didn't change the url, or
1376 * the result of the modification.
1378 *********************************************************************/
1379 char *rewrite_url(char *old_url, const char *pcrs_command)
1381 char *new_url = NULL;
1385 assert(pcrs_command);
1387 new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
1391 log_error(LOG_LEVEL_REDIRECTS,
1392 "pcrs command \"%s\" didn't change \"%s\".",
1393 pcrs_command, old_url);
1398 log_error(LOG_LEVEL_REDIRECTS,
1399 "executing pcrs command \"%s\" to rewrite %s failed: %s",
1400 pcrs_command, old_url, pcrs_strerror(hits));
1403 else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
1405 log_error(LOG_LEVEL_ERROR,
1406 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
1407 "but the result doesn't look like a valid URL and will be ignored.",
1408 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1413 log_error(LOG_LEVEL_REDIRECTS,
1414 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
1415 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1423 #ifdef FEATURE_FAST_REDIRECTS
1424 /*********************************************************************
1426 * Function : get_last_url
1428 * Description : Search for the last URL inside a string.
1429 * If the string already is a URL, it will
1430 * be the first URL found.
1433 * 1 : subject = the string to check
1434 * 2 : redirect_mode = +fast-redirect{} mode
1436 * Returns : NULL if no URL was found, or
1437 * the last URL found.
1439 *********************************************************************/
1440 char *get_last_url(char *subject, const char *redirect_mode)
1442 char *new_url = NULL;
1446 assert(redirect_mode);
1448 subject = strdup(subject);
1449 if (subject == NULL)
1451 log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
1455 if (0 == strcmpic(redirect_mode, "check-decoded-url"))
1457 log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
1458 new_url = url_decode(subject);
1459 if (new_url != NULL)
1466 log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
1470 log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
1473 * Find the last URL encoded in the request
1476 while ((tmp = strstr(tmp, "http://")) != NULL)
1480 tmp = (new_url != NULL) ? new_url : subject;
1481 while ((tmp = strstr(tmp, "https://")) != NULL)
1486 if ((new_url != NULL)
1487 && ( (new_url != subject)
1488 || (0 == strncmpic(subject, "http://", 7))
1489 || (0 == strncmpic(subject, "https://", 8))
1493 * Return new URL if we found a redirect
1494 * or if the subject already was a URL.
1496 * The second case makes sure that we can
1497 * chain get_last_url after another redirection check
1498 * (like rewrite_url) without losing earlier redirects.
1500 new_url = strdup(new_url);
1509 #endif /* def FEATURE_FAST_REDIRECTS */
1512 /*********************************************************************
1514 * Function : redirect_url
1516 * Description : Checks if Privoxy should answer the request with
1517 * a HTTP redirect and generates the redirect if
1521 * 1 : csp = Current client state (buffers, headers, etc...)
1523 * Returns : NULL if the request can pass, HTTP redirect otherwise.
1525 *********************************************************************/
1526 struct http_response *redirect_url(struct client_state *csp)
1528 struct http_response *rsp;
1529 #ifdef FEATURE_FAST_REDIRECTS
1531 * XXX: Do we still need FEATURE_FAST_REDIRECTS
1532 * as compile-time option? The user can easily disable
1533 * it in his action file.
1535 char * redirect_mode;
1536 #endif /* def FEATURE_FAST_REDIRECTS */
1537 char *old_url = NULL;
1538 char *new_url = NULL;
1539 char *redirection_string;
1541 if ((csp->action->flags & ACTION_REDIRECT))
1543 redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
1546 * If the redirection string begins with 's',
1547 * assume it's a pcrs command, otherwise treat it as
1548 * properly formatted URL and use it for the redirection
1551 * According to RFC 2616 section 14.30 the URL
1552 * has to be absolute and if the user tries:
1553 * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
1554 * she would get undefined results anyway.
1558 if (*redirection_string == 's')
1560 old_url = csp->http->url;
1561 new_url = rewrite_url(old_url, redirection_string);
1565 log_error(LOG_LEVEL_REDIRECTS,
1566 "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
1567 redirection_string);
1568 new_url = strdup(redirection_string);
1572 #ifdef FEATURE_FAST_REDIRECTS
1573 if ((csp->action->flags & ACTION_FAST_REDIRECTS))
1575 redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
1578 * If it exists, use the previously rewritten URL as input
1579 * otherwise just use the old path.
1581 old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
1582 new_url = get_last_url(old_url, redirect_mode);
1587 * Disable redirect checkers, so that they
1588 * will be only run more than once if the user
1589 * also enables them through tags.
1591 * From a performance point of view
1592 * it doesn't matter, but the duplicated
1593 * log messages are annoying.
1595 csp->action->flags &= ~ACTION_FAST_REDIRECTS;
1596 #endif /* def FEATURE_FAST_REDIRECTS */
1597 csp->action->flags &= ~ACTION_REDIRECT;
1599 /* Did any redirect action trigger? */
1602 if (0 == strcmpic(new_url, csp->http->url))
1604 log_error(LOG_LEVEL_ERROR,
1605 "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
1606 csp->http->url, new_url);
1611 log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
1613 if (NULL == (rsp = alloc_http_response()))
1616 return cgi_error_memory();
1619 if ( enlist_unique_header(rsp->headers, "Location", new_url)
1620 || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
1623 free_http_response(rsp);
1624 return cgi_error_memory();
1626 rsp->reason = RSP_REASON_REDIRECTED;
1629 return finish_http_response(csp, rsp);
1633 /* Only reached if no redirect is required */
1639 #ifdef FEATURE_IMAGE_BLOCKING
1640 /*********************************************************************
1642 * Function : is_imageurl
1644 * Description : Given a URL, decide whether it is an image or not,
1645 * using either the info from a previous +image action
1646 * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
1647 * is MSIE and not on a Mac, tell from the browser's accept
1651 * 1 : csp = Current client state (buffers, headers, etc...)
1653 * Returns : True (nonzero) if URL is an image, false (0)
1656 *********************************************************************/
1657 int is_imageurl(const struct client_state *csp)
1659 #ifdef FEATURE_IMAGE_DETECT_MSIE
1662 tmp = get_header_value(csp->headers, "User-Agent:");
1663 if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
1665 tmp = get_header_value(csp->headers, "Accept:");
1666 if (tmp && strstr(tmp, "image/gif"))
1668 /* Client will accept HTML. If this seems counterintuitive,
1678 #endif /* def FEATURE_IMAGE_DETECT_MSIE */
1680 return ((csp->action->flags & ACTION_IMAGE) != 0);
1683 #endif /* def FEATURE_IMAGE_BLOCKING */
1686 #ifdef FEATURE_TRUST
1687 /*********************************************************************
1689 * Function : is_untrusted_url
1691 * Description : Should we "distrust" this URL (and block it)?
1693 * Yes if it matches a line in the trustfile, or if the
1694 * referrer matches a line starting with "+" in the
1699 * 1 : csp = Current client state (buffers, headers, etc...)
1701 * Returns : 0 => trusted, 1 => untrusted
1703 *********************************************************************/
1704 int is_untrusted_url(const struct client_state *csp)
1706 struct file_list *fl;
1707 struct block_spec *b;
1708 struct url_spec **trusted_url;
1709 struct http_request rhttp[1];
1710 const char * referer;
1714 * If we don't have a trustlist, we trust everybody
1716 if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
1721 memset(rhttp, '\0', sizeof(*rhttp));
1724 * Do we trust the request URL itself?
1726 for (b = b->next; b ; b = b->next)
1728 if (url_match(b->url, csp->http))
1734 if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
1736 /* no referrer was supplied */
1742 * If not, do we maybe trust its referrer?
1744 err = parse_http_url(referer, rhttp, REQUIRE_PROTOCOL);
1750 for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
1752 if (url_match(*trusted_url, rhttp))
1754 /* if the URL's referrer is from a trusted referrer, then
1755 * add the target spec to the trustfile as an unblocked
1756 * domain and return 0 (which means it's OK).
1761 if (NULL != (fp = fopen(csp->config->trustfile, "a")))
1765 char * new_entry = strdup("~");
1767 string_append(&new_entry, csp->http->hostport);
1769 path = csp->http->path;
1770 if ( (path[0] == '/')
1772 && ((path_end = strchr(path + 2, '/')) != NULL))
1774 /* since this path points into a user's home space
1775 * be sure to include this spec in the trustfile.
1777 int path_len = path_end - path; /* save offset */
1778 path = strdup(path); /* Copy string */
1781 path_end = path + path_len; /* regenerate ptr to new buffer */
1782 *(path_end + 1) = '\0'; /* Truncate path after '/' */
1784 string_join(&new_entry, path);
1788 * Give a reason for generating this entry.
1790 string_append(&new_entry, " # Trusted referrer was: ");
1791 string_append(&new_entry, referer);
1793 if (new_entry != NULL)
1795 if (-1 == fprintf(fp, "%s\n", new_entry))
1797 log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
1798 new_entry, csp->config->trustfile);
1804 /* FIXME: No way to handle out-of memory, so mostly ignoring it */
1805 log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
1812 log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
1813 csp->http->hostport, csp->config->trustfile);
1821 #endif /* def FEATURE_TRUST */
1824 /*********************************************************************
1826 * Function : pcrs_filter_response
1828 * Description : Execute all text substitutions from all applying
1829 * +filter actions on the text buffer that's been
1830 * accumulated in csp->iob->buf.
1833 * 1 : csp = Current client state (buffers, headers, etc...)
1835 * Returns : a pointer to the (newly allocated) modified buffer.
1836 * or NULL if there were no hits or something went wrong
1838 *********************************************************************/
1839 static char *pcrs_filter_response(struct client_state *csp)
1842 size_t size, prev_size;
1848 struct file_list *fl;
1849 struct re_filterfile_spec *b;
1850 struct list_entry *filtername;
1852 int i, found_filters = 0;
1857 if (csp->iob->cur >= csp->iob->eod)
1863 * Need to check the set of re_filterfiles...
1865 for (i = 0; i < MAX_AF_FILES; i++)
1878 if (0 == found_filters)
1880 log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
1881 "content filtering enabled, but no content filters available.");
1885 size = (size_t)(csp->iob->eod - csp->iob->cur);
1886 old = csp->iob->cur;
1888 for (i = 0; i < MAX_AF_FILES; i++)
1891 if ((NULL == fl) || (NULL == fl->f))
1894 * Either there are no filter files
1895 * left, or this filter file just
1896 * contains no valid filters.
1898 * Continue to be sure we don't miss
1899 * valid filter files that are chained
1900 * after empty or invalid ones.
1905 * For all applying +filter actions, look if a filter by that
1906 * name exists and if yes, execute it's pcrs_joblist on the
1909 for (b = fl->f; b; b = b->next)
1911 if (b->type != FT_CONTENT_FILTER)
1913 /* Skip header filters */
1917 for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
1918 filtername ; filtername = filtername->next)
1920 if (strcmp(b->name, filtername->str) == 0)
1922 int current_hits = 0; /* Number of hits caused by this filter */
1923 int job_number = 0; /* Which job we're currently executing */
1924 int job_hits = 0; /* How many hits the current job caused */
1925 pcrs_job *joblist = b->joblist;
1927 if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
1929 if (NULL == joblist)
1931 log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
1936 /* Apply all jobs from the joblist */
1937 for (job = joblist; NULL != job; job = job->next)
1940 job_hits = pcrs_execute(job, old, size, &new, &size);
1945 * That went well. Continue filtering
1946 * and use the result of this job as
1947 * input for the next one.
1949 current_hits += job_hits;
1950 if (old != csp->iob->cur)
1959 * This job caused an unexpected error. Inform the user
1960 * and skip the rest of the jobs in this filter. We could
1961 * continue with the next job, but usually the jobs
1962 * depend on each other or are similar enough to
1963 * fail for the same reason.
1965 * At the moment our pcrs expects the error codes of pcre 3.4,
1966 * but newer pcre versions can return additional error codes.
1967 * As a result pcrs_strerror()'s error message might be
1968 * "Unknown error ...", therefore we print the numerical value
1971 * XXX: Is this important enough for LOG_LEVEL_ERROR or
1972 * should we use LOG_LEVEL_RE_FILTER instead?
1974 log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
1975 b->name, job_number, pcrs_strerror(job_hits), job_hits);
1980 if (b->dynamic) pcrs_free_joblist(joblist);
1982 log_error(LOG_LEVEL_RE_FILTER,
1983 "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
1984 csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
1986 hits += current_hits;
1993 * If there were no hits, destroy our copy and let
1994 * chat() use the original in csp->iob
2002 csp->flags |= CSP_FLAG_MODIFIED;
2003 csp->content_length = size;
2011 /*********************************************************************
2013 * Function : gif_deanimate_response
2015 * Description : Deanimate the GIF image that has been accumulated in
2016 * csp->iob->buf, set csp->content_length to the modified
2017 * size and raise the CSP_FLAG_MODIFIED flag.
2020 * 1 : csp = Current client state (buffers, headers, etc...)
2022 * Returns : a pointer to the (newly allocated) modified buffer.
2023 * or NULL in case something went wrong.
2025 *********************************************************************/
2026 static char *gif_deanimate_response(struct client_state *csp)
2028 struct binbuffer *in, *out;
2032 size = (size_t)(csp->iob->eod - csp->iob->cur);
2034 if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
2035 || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
2037 log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
2041 in->buffer = csp->iob->cur;
2044 if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
2046 log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
2053 if ((int)size == out->offset)
2055 log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
2059 log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
2061 csp->content_length = out->offset;
2062 csp->flags |= CSP_FLAG_MODIFIED;
2072 /*********************************************************************
2074 * Function : get_filter_function
2076 * Description : Decides which content filter function has
2077 * to be applied (if any).
2079 * XXX: Doesn't handle filter_popups()
2080 * because of the different prototype. Probably
2081 * we should ditch filter_popups() anyway, it's
2082 * even less reliable than popup blocking based
2086 * 1 : csp = Current client state (buffers, headers, etc...)
2088 * Returns : The content filter function to run, or
2089 * NULL if no content filter is active
2091 *********************************************************************/
2092 filter_function_ptr get_filter_function(struct client_state *csp)
2094 filter_function_ptr filter_function = NULL;
2097 * Are we enabling text mode by force?
2099 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
2102 * Do we really have to?
2104 if (csp->content_type & CT_TEXT)
2106 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
2110 csp->content_type |= CT_TEXT;
2111 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
2115 if (!(csp->content_type & CT_DECLARED))
2118 * The server didn't bother to declare a MIME-Type.
2119 * Assume it's text that can be filtered.
2121 * This also regulary happens with 304 responses,
2122 * therefore logging anything here would cause
2125 csp->content_type |= CT_TEXT;
2129 * Choose the applying filter function based on
2130 * the content type and action settings.
2132 if ((csp->content_type & CT_TEXT) &&
2133 (csp->rlist != NULL) &&
2134 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
2136 filter_function = pcrs_filter_response;
2138 else if ((csp->content_type & CT_GIF) &&
2139 (csp->action->flags & ACTION_DEANIMATE))
2141 filter_function = gif_deanimate_response;
2144 return filter_function;
2148 /*********************************************************************
2150 * Function : remove_chunked_transfer_coding
2152 * Description : In-situ remove the "chunked" transfer coding as defined
2153 * in rfc2616 from a buffer.
2156 * 1 : buffer = Pointer to the text buffer
2157 * 2 : size = In: Number of bytes to be processed,
2158 * Out: Number of bytes after de-chunking.
2159 * (undefined in case of errors)
2161 * Returns : JB_ERR_OK for success,
2162 * JB_ERR_PARSE otherwise
2164 *********************************************************************/
2165 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
2168 unsigned int chunksize = 0;
2169 char *from_p, *to_p;
2172 from_p = to_p = buffer;
2174 if (sscanf(buffer, "%x", &chunksize) != 1)
2176 log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
2177 return JB_ERR_PARSE;
2180 while (chunksize > 0)
2182 if (NULL == (from_p = strstr(from_p, "\r\n")))
2184 log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
2185 return JB_ERR_PARSE;
2188 if ((newsize += chunksize) >= *size)
2190 log_error(LOG_LEVEL_ERROR, "Chunksize exceeds buffer in \"chunked\" transfer coding");
2191 return JB_ERR_PARSE;
2195 memmove(to_p, from_p, (size_t) chunksize);
2196 to_p = buffer + newsize;
2197 from_p += chunksize + 2;
2199 if (sscanf(from_p, "%x", &chunksize) != 1)
2201 log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
2206 /* XXX: Should get its own loglevel. */
2207 log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
2216 /*********************************************************************
2218 * Function : prepare_for_filtering
2220 * Description : If necessary, de-chunks and decompresses
2221 * the content so it can get filterd.
2224 * 1 : csp = Current client state (buffers, headers, etc...)
2226 * Returns : JB_ERR_OK for success,
2227 * JB_ERR_PARSE otherwise
2229 *********************************************************************/
2230 static jb_err prepare_for_filtering(struct client_state *csp)
2232 jb_err err = JB_ERR_OK;
2235 * If the body has a "chunked" transfer-encoding,
2236 * get rid of it, adjusting size and iob->eod
2238 if (csp->flags & CSP_FLAG_CHUNKED)
2240 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
2242 log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
2243 err = remove_chunked_transfer_coding(csp->iob->cur, &size);
2244 if (JB_ERR_OK == err)
2246 csp->iob->eod = csp->iob->cur + size;
2247 csp->flags |= CSP_FLAG_MODIFIED;
2251 return JB_ERR_PARSE;
2257 * If the body has a supported transfer-encoding,
2258 * decompress it, adjusting size and iob->eod.
2260 if (csp->content_type & (CT_GZIP|CT_DEFLATE))
2262 if (0 == csp->iob->eod - csp->iob->cur)
2264 /* Nothing left after de-chunking. */
2268 err = decompress_iob(csp);
2270 if (JB_ERR_OK == err)
2272 csp->flags |= CSP_FLAG_MODIFIED;
2273 csp->content_type &= ~CT_TABOO;
2278 * Unset CT_GZIP and CT_DEFLATE to remember not
2279 * to modify the Content-Encoding header later.
2281 csp->content_type &= ~CT_GZIP;
2282 csp->content_type &= ~CT_DEFLATE;
2291 /*********************************************************************
2293 * Function : execute_content_filter
2295 * Description : Executes a given content filter.
2298 * 1 : csp = Current client state (buffers, headers, etc...)
2299 * 2 : content_filter = The filter function to execute
2301 * Returns : Pointer to the modified buffer, or
2302 * NULL if filtering failed or wasn't necessary.
2304 *********************************************************************/
2305 char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
2307 if (0 == csp->iob->eod - csp->iob->cur)
2310 * No content (probably status code 301, 302 ...),
2311 * no filtering necessary.
2316 if (JB_ERR_OK != prepare_for_filtering(csp))
2319 * failed to de-chunk or decompress.
2324 if (0 == csp->iob->eod - csp->iob->cur)
2327 * Clown alarm: chunked and/or compressed nothing delivered.
2332 return ((*content_filter)(csp));
2336 /*********************************************************************
2338 * Function : get_url_actions
2340 * Description : Gets the actions for this URL.
2343 * 1 : csp = Current client state (buffers, headers, etc...)
2344 * 2 : http = http_request request for blocked URLs
2348 *********************************************************************/
2349 void get_url_actions(struct client_state *csp, struct http_request *http)
2351 struct file_list *fl;
2352 struct url_actions *b;
2355 init_current_action(csp->action);
2357 for (i = 0; i < MAX_AF_FILES; i++)
2359 if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
2364 apply_url_actions(csp->action, http, b);
2371 /*********************************************************************
2373 * Function : apply_url_actions
2375 * Description : Applies a list of URL actions.
2378 * 1 : action = Destination.
2379 * 2 : http = Current URL
2380 * 3 : b = list of URL actions to apply
2384 *********************************************************************/
2385 void apply_url_actions(struct current_action_spec *action,
2386 struct http_request *http,
2387 struct url_actions *b)
2391 /* Should never happen */
2395 for (b = b->next; NULL != b; b = b->next)
2397 if (url_match(b->url, http))
2399 merge_current_action(action, b->action);
2405 /*********************************************************************
2407 * Function : get_forward_override_settings
2409 * Description : Returns forward settings as specified with the
2410 * forward-override{} action. forward-override accepts
2411 * forward lines similar to the one used in the
2412 * configuration file, but without the URL pattern.
2418 * in the configuration file can be replaced with
2419 * the action section:
2421 * {+forward-override{forward .}}
2425 * 1 : csp = Current client state (buffers, headers, etc...)
2427 * Returns : Pointer to forwarding structure in case of success.
2428 * Invalid syntax is fatal.
2430 *********************************************************************/
2431 const static struct forward_spec *get_forward_override_settings(struct client_state *csp)
2433 const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
2434 char forward_settings[BUFFER_SIZE];
2435 char *http_parent = NULL;
2436 /* variable names were chosen for consistency reasons. */
2437 struct forward_spec *fwd = NULL;
2441 assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
2442 /* Should be enforced by load_one_actions_file() */
2443 assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
2445 /* Create a copy ssplit can modify */
2446 strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
2448 if (NULL != csp->fwd)
2451 * XXX: Currently necessary to prevent memory
2452 * leaks when the show-url-info cgi page is visited.
2454 unload_forward_spec(csp->fwd);
2458 * allocate a new forward node, valid only for
2459 * the lifetime of this request. Save its location
2460 * in csp as well, so sweep() can free it later on.
2462 fwd = csp->fwd = zalloc(sizeof(*fwd));
2465 log_error(LOG_LEVEL_FATAL,
2466 "can't allocate memory for forward-override{%s}", forward_override_line);
2467 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2470 vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
2471 if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
2473 fwd->type = SOCKS_NONE;
2475 /* Parse the parent HTTP proxy host:port */
2476 http_parent = vec[1];
2479 else if (vec_count == 3)
2481 char *socks_proxy = NULL;
2483 if (!strcasecmp(vec[0], "forward-socks4"))
2485 fwd->type = SOCKS_4;
2486 socks_proxy = vec[1];
2488 else if (!strcasecmp(vec[0], "forward-socks4a"))
2490 fwd->type = SOCKS_4A;
2491 socks_proxy = vec[1];
2493 else if (!strcasecmp(vec[0], "forward-socks5"))
2495 fwd->type = SOCKS_5;
2496 socks_proxy = vec[1];
2499 if (NULL != socks_proxy)
2501 /* Parse the SOCKS proxy host[:port] */
2502 fwd->gateway_host = strdup(socks_proxy);
2504 if (NULL != (socks_proxy = strchr(fwd->gateway_host, ':')))
2506 *socks_proxy++ = '\0';
2507 fwd->gateway_port = strtol(socks_proxy, NULL, 0);
2510 if (fwd->gateway_port <= 0)
2512 fwd->gateway_port = 1080;
2515 http_parent = vec[2];
2519 if (NULL == http_parent)
2521 log_error(LOG_LEVEL_FATAL,
2522 "Invalid forward-override syntax in: %s", forward_override_line);
2523 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2526 /* Parse http forwarding settings */
2527 if (strcmp(http_parent, ".") != 0)
2529 fwd->forward_host = strdup(http_parent);
2531 if (NULL != (http_parent = strchr(fwd->forward_host, ':')))
2533 *http_parent++ = '\0';
2534 fwd->forward_port = strtol(http_parent, NULL, 0);
2537 if (fwd->forward_port <= 0)
2539 fwd->forward_port = 8000;
2543 assert (NULL != fwd);
2545 log_error(LOG_LEVEL_CONNECT,
2546 "Overriding forwarding settings based on \'%s\'", forward_override_line);
2552 /*********************************************************************
2554 * Function : forward_url
2556 * Description : Should we forward this to another proxy?
2559 * 1 : csp = Current client state (buffers, headers, etc...)
2560 * 2 : http = http_request request for current URL
2562 * Returns : Pointer to forwarding information.
2564 *********************************************************************/
2565 const struct forward_spec *forward_url(struct client_state *csp,
2566 const struct http_request *http)
2568 static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
2569 struct forward_spec *fwd = csp->config->forward;
2571 if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
2573 return get_forward_override_settings(csp);
2583 if (url_match(fwd->url, http))
2594 /*********************************************************************
2596 * Function : direct_response
2598 * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
2599 * request and if so, return a HTTP 501 to the client.
2601 * FIXME: I have a stupid name and I should handle the
2602 * requests properly. Still, what we do here is rfc-
2603 * compliant, whereas ignoring or forwarding are not.
2606 * 1 : csp = Current client state (buffers, headers, etc...)
2608 * Returns : http_response if , NULL if nonmatch or handler fail
2610 *********************************************************************/
2611 struct http_response *direct_response(struct client_state *csp)
2613 struct http_response *rsp;
2614 struct list_entry *p;
2616 if ((0 == strcmpic(csp->http->gpc, "trace"))
2617 || (0 == strcmpic(csp->http->gpc, "options")))
2619 for (p = csp->headers->first; (p != NULL) ; p = p->next)
2621 if (!strncmpic("Max-Forwards:", p->str, 13))
2623 unsigned int max_forwards;
2626 * If it's a Max-Forwards value of zero,
2627 * we have to intercept the request.
2629 if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
2632 * FIXME: We could handle at least TRACE here,
2633 * but that would require a verbatim copy of
2634 * the request which we don't have anymore
2636 log_error(LOG_LEVEL_HEADER,
2637 "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
2640 /* Get mem for response or fail*/
2641 if (NULL == (rsp = alloc_http_response()))
2643 return cgi_error_memory();
2646 if (NULL == (rsp->status = strdup("501 Not Implemented")))
2648 free_http_response(rsp);
2649 return cgi_error_memory();
2653 rsp->reason = RSP_REASON_UNSUPPORTED;
2655 return(finish_http_response(csp, rsp));
2664 /*********************************************************************
2666 * Function : content_filters_enabled
2668 * Description : Checks whether there are any content filters
2669 * enabled for the current request.
2672 * 1 : action = Action spec to check.
2674 * Returns : TRUE for yes, FALSE otherwise
2676 *********************************************************************/
2677 int content_filters_enabled(const struct current_action_spec *action)
2679 return ((action->flags & ACTION_DEANIMATE) ||
2680 !list_is_empty(action->multi[ACTION_MULTI_FILTER]));