1 const char filters_rcs[] = "$Id: filters.c,v 1.111 2008/12/04 18:13:46 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 1.111 2008/12/04 18:13:46 fabiankeil
44 * Fix a cparser warning.
46 * Revision 1.110 2008/11/10 16:40:25 fabiankeil
47 * Fix a gcc44 warning.
49 * Revision 1.109 2008/11/08 15:48:41 fabiankeil
50 * Mention actual values when complaining about
51 * the chunk size exceeding the buffer size.
53 * Revision 1.108 2008/05/21 15:35:08 fabiankeil
54 * - Mark csp as immutable for block_acl().
55 * - Remove an obsolete complaint about filter_popups().
57 * Revision 1.107 2008/05/04 17:52:56 fabiankeil
58 * Adjust parse_http_url() call to new prototype.
60 * Revision 1.106 2008/05/03 16:40:44 fabiankeil
61 * Change content_filters_enabled()'s parameter from
62 * csp->action to action so it can be also used in the
63 * CGI code. Don't bother checking if there are filters
64 * loaded, as that's somewhat besides the point.
66 * Revision 1.105 2008/03/28 15:13:39 fabiankeil
67 * Remove inspect-jpegs action.
69 * Revision 1.104 2008/03/27 18:27:24 fabiankeil
70 * Remove kill-popups action.
72 * Revision 1.103 2008/03/06 16:33:45 fabiankeil
73 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
75 * Revision 1.102 2008/03/01 14:00:44 fabiankeil
76 * Let the block action take the reason for the block
77 * as argument and show it on the "blocked" page.
79 * Revision 1.101 2008/02/23 16:57:12 fabiankeil
80 * Rename url_actions() to get_url_actions() and let it
81 * use the standard parameter ordering.
83 * Revision 1.100 2008/02/23 16:33:43 fabiankeil
84 * Let forward_url() use the standard parameter ordering
85 * and mark its second parameter immutable.
87 * Revision 1.99 2008/02/03 13:57:58 fabiankeil
88 * Add SOCKS5 support for forward-override{}.
90 * Revision 1.98 2008/01/04 17:43:45 fabiankeil
91 * Improve the warning messages that get logged if the action files
92 * "enable" filters but no filters of that type have been loaded.
94 * Revision 1.97 2007/11/30 15:37:03 fabiankeil
95 * Use freez instead of free.
97 * Revision 1.96 2007/10/19 16:53:28 fabiankeil
98 * Add helper function to check if any content filters are enabled.
100 * Revision 1.95 2007/10/17 19:31:20 fabiankeil
101 * Omitting the zero chunk that ends the chunk transfer encoding seems
102 * to be the new black. Log the problem and continue filtering anyway.
104 * Revision 1.94 2007/09/29 13:20:20 fabiankeil
105 * Remove two redundant and one useless log messages.
107 * Revision 1.93 2007/09/29 10:21:16 fabiankeil
108 * - Move get_filter_function() from jcc.c to filters.c
109 * so the filter functions can be static.
110 * - Don't bother filtering body-less responses.
112 * Revision 1.92 2007/09/28 16:38:55 fabiankeil
113 * - Execute content filters through execute_content_filter().
114 * - Add prepare_for_filtering() so filter functions don't have to
115 * care about de-chunking and decompression. As a side effect this enables
116 * decompression for gif_deanimate_response() and jpeg_inspect_response().
117 * - Change remove_chunked_transfer_coding()'s return type to jb_err.
118 * Some clowns feel like chunking empty responses in which case
119 * (size == 0) is valid but previously would be interpreted as error.
121 * Revision 1.91 2007/09/02 15:31:20 fabiankeil
122 * Move match_portlist() from filter.c to urlmatch.c.
123 * It's used for url matching, not for filtering.
125 * Revision 1.90 2007/09/02 12:44:17 fabiankeil
126 * Remove newline at the end of a log_error() message.
128 * Revision 1.89 2007/08/05 13:42:23 fabiankeil
129 * #1763173 from Stefan Huehner: declare some more functions static.
131 * Revision 1.88 2007/06/01 16:41:11 fabiankeil
132 * Add forward-override{} to change the forwarding settings through
133 * action sections. This is mainly interesting to forward different
134 * clients differently (for example based on User-Agent or request
137 * Revision 1.87 2007/04/30 15:53:10 fabiankeil
138 * Make sure filters with dynamic jobs actually use them.
140 * Revision 1.86 2007/04/30 15:03:28 fabiankeil
141 * - Introduce dynamic pcrs jobs that can resolve variables.
142 * - Don't run redirect functions more than once,
143 * unless they are activated more than once.
145 * Revision 1.85 2007/03/21 12:24:47 fabiankeil
146 * - Log the content size after decompression in decompress_iob()
147 * instead of pcrs_filter_response().
149 * Revision 1.84 2007/03/20 15:16:34 fabiankeil
150 * Use dedicated header filter actions instead of abusing "filter".
151 * Replace "filter-client-headers" and "filter-client-headers"
152 * with "server-header-filter" and "client-header-filter".
154 * Revision 1.83 2007/03/17 15:20:05 fabiankeil
155 * New config option: enforce-blocks.
157 * Revision 1.82 2007/03/13 11:28:43 fabiankeil
158 * - Fix port handling in acl_addr() and use a temporary acl spec
159 * copy so error messages don't contain a truncated version.
160 * - Log size of iob before and after decompression.
162 * Revision 1.81 2007/03/05 14:40:53 fabiankeil
163 * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
164 * - Hide the "Go there anyway" link for blocked CONNECT
165 * requests where going there anyway doesn't work anyway.
167 * Revision 1.80 2007/02/07 10:55:20 fabiankeil
168 * - Save the reason for generating http_responses.
169 * - Block (+block) with status code 403 instead of 404.
170 * - Use a different kludge to remember a failed decompression.
172 * Revision 1.79 2007/01/31 16:21:38 fabiankeil
173 * Search for Max-Forwards headers case-insensitive,
174 * don't generate the "501 unsupported" message for invalid
175 * Max-Forwards values and don't increase negative ones.
177 * Revision 1.78 2007/01/28 13:41:18 fabiankeil
178 * - Add HEAD support to finish_http_response.
179 * - Add error favicon to internal HTML error messages.
181 * Revision 1.77 2007/01/12 15:36:44 fabiankeil
182 * Mark *csp as immutable for is_untrusted_url()
183 * and is_imageurl(). Closes FR 1237736.
185 * Revision 1.76 2007/01/01 19:36:37 fabiankeil
186 * Integrate a modified version of Wil Mahan's
187 * zlib patch (PR #895531).
189 * Revision 1.75 2006/12/29 18:30:46 fabiankeil
190 * Fixed gcc43 conversion warnings,
191 * changed sprintf calls to snprintf.
193 * Revision 1.74 2006/12/24 17:37:38 fabiankeil
194 * Adjust comment in pcrs_filter_response()
195 * to recent pcrs changes. Hohoho.
197 * Revision 1.73 2006/12/23 16:01:02 fabiankeil
198 * Don't crash if pcre returns an error code
199 * that pcrs didn't expect. Fixes BR 1621173.
201 * Revision 1.72 2006/12/22 18:52:53 fabiankeil
202 * Modified is_untrusted_url to complain in case of
203 * write errors and to give a reason when adding new
204 * entries to the trustfile. Closes FR 1097611.
206 * Revision 1.71 2006/12/22 14:24:52 fabiankeil
207 * Skip empty filter files in pcrs_filter_response,
208 * but don't ignore the ones that come afterwards.
209 * Fixes parts of BR 1619208.
211 * Revision 1.70 2006/12/09 13:33:15 fabiankeil
212 * Added some sanity checks for get_last_url().
213 * Fixed possible segfault caused by my last commit.
215 * Revision 1.69 2006/12/08 12:39:13 fabiankeil
216 * Let get_last_url() catch https URLs as well.
218 * Revision 1.68 2006/12/05 14:45:48 fabiankeil
219 * Make sure get_last_url() behaves like advertised
220 * and fast-redirects{} can be combined with redirect{}.
222 * Revision 1.67 2006/11/28 15:19:43 fabiankeil
223 * Implemented +redirect{s@foo@bar@} to generate
224 * a redirect based on a rewritten version of the
227 * Revision 1.66 2006/09/23 13:26:38 roro
228 * Replace TABs by spaces in source code.
230 * Revision 1.65 2006/09/21 12:54:43 fabiankeil
231 * Fix +redirect{}. Didn't work with -fast-redirects.
233 * Revision 1.64 2006/08/31 10:55:49 fabiankeil
234 * Block requests for untrusted URLs with status
235 * code 403 instead of 200.
237 * Revision 1.63 2006/08/31 10:11:28 fabiankeil
238 * Don't free p which is still in use and will be later
239 * freed by free_map(). Don't claim the referrer is unknown
240 * when the client didn't set one.
242 * Revision 1.62 2006/08/14 00:27:47 david__schmidt
243 * Feature request 595948: Re-Filter logging in single line
245 * Revision 1.61 2006/08/03 02:46:41 david__schmidt
246 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
248 * Revision 1.60 2006/07/18 14:48:46 david__schmidt
249 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
250 * with what was really the latest development (the v_3_0_branch branch)
252 * Revision 1.58.2.9 2006/01/29 23:10:56 david__schmidt
253 * Multiple filter file support
255 * Revision 1.58.2.8 2005/05/07 21:50:55 david__schmidt
256 * A few memory leaks plugged (mostly on error paths)
258 * Revision 1.58.2.7 2004/10/03 12:53:32 david__schmidt
259 * Add the ability to check jpeg images for invalid
260 * lengths of comment blocks. Defensive strategy
261 * against the exploit:
262 * Microsoft Security Bulletin MS04-028
263 * Buffer Overrun in JPEG Processing (GDI+) Could
264 * Allow Code Execution (833987)
265 * Enabled with +inspect-jpegs in actions files.
267 * Revision 1.58.2.6 2003/12/06 22:18:27 gliptak
268 * Correcting compile problem with FEATURE_IMAGE_BLOCKING
270 * Revision 1.58.2.5 2003/11/11 13:10:31 oes
271 * Fixed bug #839859: "See why" link URL now gets url-encoded.
273 * Revision 1.58.2.4 2003/02/28 12:52:45 oes
276 * Revision 1.58.2.3 2002/09/25 14:51:51 oes
277 * Added basic support for OPTIONS and TRACE HTTP methods:
278 * New function direct_response which handles OPTIONS and
279 * TRACE requests whose Max-Forwards header field is zero.
281 * Revision 1.58.2.2 2002/08/01 17:18:28 oes
282 * Fixed BR 537651 / SR 579724 (MSIE image detect improper for IE/Mac)
284 * Revision 1.58.2.1 2002/07/26 15:18:53 oes
285 * - Bugfix: Executing a filters without jobs no longer results in
286 * turing off *all* filters.
287 * - Security fix: Malicious web servers can't cause a seg fault
288 * through bogus chunk sizes anymore
290 * Revision 1.58 2002/04/24 02:11:17 oes
291 * Jon's multiple AF patch: url_actions now evaluates rules
294 * Revision 1.57 2002/04/08 20:38:34 swa
297 * Revision 1.56 2002/04/05 15:51:24 oes
298 * - bugfix: error-pages now get correct request protocol
299 * - fix for invalid HTML in trust info
301 * Revision 1.55 2002/04/02 16:13:51 oes
302 * Fix: No "Go there anyway" for SSL
304 * Revision 1.54 2002/04/02 14:55:56 oes
305 * Bugfix: is_untrusted_url() now depends on FEATURE_TRUST, not FEATURE_COOKIE_JAR
307 * Revision 1.53 2002/03/26 22:29:54 swa
308 * we have a new homepage!
310 * Revision 1.52 2002/03/24 16:35:57 jongfoster
313 * Revision 1.51 2002/03/24 15:23:33 jongfoster
316 * Revision 1.50 2002/03/24 13:25:43 swa
317 * name change related issues
319 * Revision 1.49 2002/03/16 20:29:14 oes
322 * Revision 1.48 2002/03/13 20:25:34 oes
323 * Better logging for content filters
325 * Revision 1.47 2002/03/13 00:30:52 jongfoster
327 * Added option of always sending redirect for imageblock,
328 * currently disabled with #if 0.
330 * Revision 1.46 2002/03/12 01:42:49 oes
331 * Introduced modular filters
333 * Revision 1.45 2002/03/08 16:47:50 oes
334 * Added choice beween GIF and PNG built-in images
336 * Revision 1.44 2002/03/07 03:49:31 oes
337 * - Fixed compiler warnings etc
338 * - Changed built-in images from GIF to PNG
339 * (with regard to Unisys patent issue)
340 * - Added a 4x4 pattern PNG which is less intrusive
341 * than the logo but also clearly marks the deleted banners
343 * Revision 1.43 2002/01/22 23:51:59 jongfoster
344 * Replacing strsav() with the safer string_append().
346 * Adding missing html_encode() to error message generators. Where encoded
347 * and unencoded versions of a string were provided, removing the unencoded
350 * Revision 1.42 2002/01/17 21:00:32 jongfoster
351 * Moving all our URL and URL pattern parsing code to urlmatch.c.
353 * Using a single, simple url_match(pattern,url) function - rather than
354 * the 3-line match routine which was repeated all over the place.
356 * Renaming free_url to free_url_spec, since it frees a struct url_spec.
358 * Using parse_http_url() to parse URLs without faking a HTTP
359 * request line for parse_http_request().
361 * Revision 1.41 2001/11/13 00:14:07 jongfoster
362 * Fixing stupid bug now I've figured out what || means.
363 * (It always returns 0 or 1, not one of it's paramaters.)
365 * Revision 1.40 2001/10/26 17:37:55 oes
366 * - Re-enabled Netscape 200/404 bug workaround in block_url():
367 * - Removed OS/2 special case
368 * - Made block_url() independant from sed() having been run
369 * - Made trust_url independant from sed() having been run
370 * - Made is_imageurl independant from sed() having been run.
371 * It now checks User-Agent: and Accept: by itself.
374 * Revision 1.39 2001/10/25 03:40:48 david__schmidt
375 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
376 * threads to call select() simultaneously. So, it's time to do a real, live,
377 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
378 * (native). Both versions will work, but using __OS2__ offers multi-threading.
380 * Revision 1.38 2001/10/23 21:32:33 jongfoster
381 * Adding error-checking to selected functions
383 * Revision 1.37 2001/10/22 15:33:56 david__schmidt
384 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
385 * filters.c. Added a FIXME in front of the offending code. I'll gladly
386 * put in a better/more robust fix for all parties if one is presented...
387 * It seems that just returning 200 instead of 404 would pretty much fix
388 * it for everyone, but I don't know all the history of the problem.
390 * Revision 1.36 2001/10/10 16:44:16 oes
391 * Added match_portlist function
393 * Revision 1.35 2001/10/07 15:41:23 oes
394 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
396 * New function remove_chunked_transfer_coding that strips chunked
397 * transfer coding to plain and is called by pcrs_filter_response
398 * and gif_deanimate_response if neccessary
400 * Improved handling of zero-change re_filter runs
402 * pcrs_filter_response and gif_deanimate_response now remove
403 * chunked transfer codeing before processing the body.
405 * Revision 1.34 2001/09/20 15:49:36 steudten
407 * Fix BUG: Change int size to size_t size in pcrs_filter_response().
408 * See cgi.c fill_template().
410 * Revision 1.33 2001/09/16 17:05:14 jongfoster
411 * Removing unused #include showarg.h
413 * Revision 1.32 2001/09/16 13:21:27 jongfoster
414 * Changes to use new list functions.
416 * Revision 1.31 2001/09/16 11:38:02 jongfoster
417 * Splitting fill_template() into 2 functions:
418 * template_load() loads the file
419 * template_fill() performs the PCRS regexps.
420 * This is because the CGI edit interface has a "table row"
421 * template which is used many times in the page - this
422 * change means it's only loaded from disk once.
424 * Revision 1.30 2001/09/16 11:00:10 jongfoster
425 * New function alloc_http_response, for symmetry with free_http_response
427 * Revision 1.29 2001/09/13 23:32:40 jongfoster
428 * Moving image data to cgi.c rather than cgi.h
429 * Fixing a GPF under Win32 (and any other OS that protects global
430 * constants from being written to).
432 * Revision 1.28 2001/09/10 10:18:51 oes
433 * Silenced compiler warnings
435 * Revision 1.27 2001/08/05 16:06:20 jongfoster
436 * Modifiying "struct map" so that there are now separate header and
437 * "map_entry" structures. This means that functions which modify a
438 * map no longer need to return a pointer to the modified map.
439 * Also, it no longer reverses the order of the entries (which may be
440 * important with some advanced template substitutions).
442 * Revision 1.26 2001/07/30 22:08:36 jongfoster
443 * Tidying up #defines:
444 * - All feature #defines are now of the form FEATURE_xxx
445 * - Permanently turned off WIN_GUI_EDIT
446 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
448 * Revision 1.25 2001/07/26 10:09:46 oes
449 * Made browser detection a little less naive
451 * Revision 1.24 2001/07/25 17:22:51 oes
452 * Added workaround for Netscape bug that prevents display of page when loading a component fails.
454 * Revision 1.23 2001/07/23 13:40:12 oes
455 * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
457 * Revision 1.22 2001/07/18 12:29:34 oes
458 * - Made gif_deanimate_response respect
459 * csp->action->string[ACTION_STRING_DEANIMATE]
460 * - Logging cosmetics
462 * Revision 1.21 2001/07/13 13:59:53 oes
463 * - Introduced gif_deanimate_response which shares the
464 * generic content modification interface of pcrs_filter_response
465 * and acts as a wrapper to deanimate.c:gif_deanimate()
466 * - Renamed re_process_buffer to pcrs_filter_response
467 * - pcrs_filter_response now returns NULL on failiure
468 * - Removed all #ifdef PCRS
470 * Revision 1.20 2001/07/01 17:01:04 oes
471 * Added comments and missing return statement in is_untrusted_url()
473 * Revision 1.19 2001/06/29 21:45:41 oes
474 * Indentation, CRLF->LF, Tab-> Space
476 * Revision 1.18 2001/06/29 13:27:38 oes
477 * - Cleaned up, renamed and reorderd functions
478 * and improved comments
481 * - Ported to CGI platform. Now delivers
482 * http_response or NULL
483 * - Unified HTML and GIF generation (moved image detection
484 * and GIF generation here from jcc.c:chat())
485 * - Fixed HTTP status to:
486 * - 403 (Forbidden) for the "blocked" HTML message
487 * - 200 (OK) for GIF answers
488 * - 302 (Redirect) for redirect to GIF
491 * - Ported to CGI platform. Now delivers
492 * http_response or NULL
493 * - Separated detection of untrusted URL into
494 * (bool)is_untrusted_url
495 * - Added enforcement of untrusted requests
497 * - Moved redirect_url() from cgi.c to here
498 * and ported it to the CGI platform
500 * - Removed logentry from cancelled commit
502 * Revision 1.17 2001/06/09 10:55:28 jongfoster
503 * Changing BUFSIZ ==> BUFFER_SIZE
505 * Revision 1.16 2001/06/07 23:10:26 jongfoster
506 * Allowing unanchored domain patterns to back off and retry
507 * if they partially match. Optimized right-anchored patterns.
508 * Moving ACL and forward files into config file.
509 * Replacing struct gateway with struct forward_spec
511 * Revision 1.15 2001/06/03 19:12:00 oes
512 * extracted-CGI relevant stuff
514 * Revision 1.14 2001/06/01 10:30:55 oes
515 * Added optional left-anchoring to domaincmp
517 * Revision 1.13 2001/05/31 21:21:30 jongfoster
518 * Permissionsfile / actions file changes:
519 * - Changed "permission" to "action" throughout
520 * - changes to file format to allow string parameters
521 * - Moved helper functions to actions.c
523 * Revision 1.12 2001/05/31 17:35:20 oes
525 * - Enhanced domain part globbing with infix and prefix asterisk
526 * matching and optional unanchored operation
528 * Revision 1.11 2001/05/29 11:53:23 oes
529 * "See why" link added to "blocked" page
531 * Revision 1.10 2001/05/29 09:50:24 jongfoster
532 * Unified blocklist/imagelist/permissionslist.
533 * File format is still under discussion, but the internal changes
536 * Also modified interceptor behaviour:
537 * - We now intercept all URLs beginning with one of the following
538 * prefixes (and *only* these prefixes):
540 * * http://ijbswa.sf.net/config/
541 * * http://ijbswa.sourceforge.net/config/
542 * - New interceptors "home page" - go to http://i.j.b/ to see it.
543 * - Internal changes so that intercepted and fast redirect pages
544 * are not replaced with an image.
545 * - Interceptors now have the option to send a binary page direct
546 * to the client. (i.e. ijb-send-banner uses this)
547 * - Implemented show-url-info interceptor. (Which is why I needed
548 * the above interceptors changes - a typical URL is
549 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
550 * The previous mechanism would not have intercepted that, and
551 * if it had been intercepted then it then it would have replaced
554 * Revision 1.9 2001/05/27 22:17:04 oes
556 * - re_process_buffer no longer writes the modified buffer
557 * to the client, which was very ugly. It now returns the
558 * buffer, which it is then written by chat.
560 * - content_length now adjusts the Content-Length: header
561 * for modified documents rather than crunch()ing it.
562 * (Length info in csp->content_length, which is 0 for
563 * unmodified documents)
565 * - For this to work, sed() is called twice when filtering.
567 * Revision 1.8 2001/05/26 17:13:28 jongfoster
568 * Filled in a function comment.
570 * Revision 1.7 2001/05/26 15:26:15 jongfoster
571 * ACL feature now provides more security by immediately dropping
572 * connections from untrusted hosts.
574 * Revision 1.6 2001/05/26 00:28:36 jongfoster
575 * Automatic reloading of config file.
576 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
577 * Most of the global variables have been moved to a new
578 * struct configuration_spec, accessed through csp->config->globalname
579 * Most of the globals remaining are used by the Win32 GUI.
581 * Revision 1.5 2001/05/25 22:34:30 jongfoster
584 * Revision 1.4 2001/05/22 18:46:04 oes
586 * - Enabled filtering banners by size rather than URL
587 * by adding patterns that replace all standard banner
588 * sizes with the "Junkbuster" gif to the re_filterfile
590 * - Enabled filtering WebBugs by providing a pattern
591 * which kills all 1x1 images
593 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
594 * which is selected by the (nonstandard and therefore
595 * capital) letter 'U' in the option string.
596 * It causes the quantifiers to be ungreedy by default.
597 * Appending a ? turns back to greedy (!).
599 * - Added a new interceptor ijb-send-banner, which
600 * sends back the "Junkbuster" gif. Without imagelist or
601 * MSIE detection support, or if tinygif = 1, or the
602 * URL isn't recognized as an imageurl, a lame HTML
603 * explanation is sent instead.
605 * - Added new feature, which permits blocking remote
606 * script redirects and firing back a local redirect
608 * The feature is conditionally compiled, i.e. it
609 * can be disabled with --disable-fast-redirects,
610 * plus it must be activated by a "fast-redirects"
611 * line in the config file, has its own log level
612 * and of course wants to be displayed by show-proxy-args
613 * Note: Boy, all the #ifdefs in 1001 locations and
614 * all the fumbling with configure.in and acconfig.h
615 * were *way* more work than the feature itself :-(
617 * - Because a generic redirect template was needed for
618 * this, tinygif = 3 now uses the same.
620 * - Moved GIFs, and other static HTTP response templates
625 * - Removed some >400 CRs again (Jon, you really worked
628 * Revision 1.3 2001/05/20 16:44:47 jongfoster
629 * Removing last hardcoded Junkbusters.com URLs.
631 * Revision 1.2 2001/05/20 01:21:20 jongfoster
632 * Version 2.9.4 checkin.
633 * - Merged popupfile and cookiefile, and added control over PCRS
634 * filtering, in new "permissionsfile".
635 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
636 * file error you now get a message box (in the Win32 GUI) rather
637 * than the program exiting with no explanation.
638 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
640 * - Removed tabs from "config"
641 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
642 * - Bumped up version number.
644 * Revision 1.1.1.1 2001/05/15 13:58:52 oes
645 * Initial import of version 2.9.3 source tree
648 *********************************************************************/
654 #include <sys/types.h>
663 #endif /* ndef __OS2__ */
664 #include <netinet/in.h>
666 #include <winsock2.h>
667 #endif /* ndef _WIN32 */
671 #endif /* def __OS2__ */
679 #include "jbsockets.h"
680 #include "miscutil.h"
684 #include "deanimate.h"
685 #include "urlmatch.h"
692 const char filters_h_rcs[] = FILTERS_H_VERSION;
694 /* Fix a problem with Solaris. There should be no effect on other
696 * Solaris's isspace() is a macro which uses it's argument directly
697 * as an array index. Therefore we need to make sure that high-bit
698 * characters generate +ve values, and ideally we also want to make
699 * the argument match the declared parameter type of "int".
701 #define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
703 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
704 static jb_err prepare_for_filtering(struct client_state *csp);
707 /*********************************************************************
709 * Function : block_acl
711 * Description : Block this request?
712 * Decide yes or no based on ACL file.
715 * 1 : dst = The proxy or gateway address this is going to.
716 * Or NULL to check all possible targets.
717 * 2 : csp = Current client state (buffers, headers, etc...)
718 * Also includes the client IP address.
720 * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
722 *********************************************************************/
723 int block_acl(const struct access_control_addr *dst, const struct client_state *csp)
725 struct access_control_list *acl = csp->config->acl;
727 /* if not using an access control list, then permit the connection */
733 /* search the list */
736 if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
740 /* Just want to check if they have any access */
741 if (acl->action == ACL_PERMIT)
746 else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
747 && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
749 if (acl->action == ACL_PERMIT)
767 /*********************************************************************
769 * Function : acl_addr
771 * Description : Called from `load_config' to parse an ACL address.
774 * 1 : aspec = String specifying ACL address.
775 * 2 : aca = struct access_control_addr to fill in.
777 * Returns : 0 => Ok, everything else is an error.
779 *********************************************************************/
780 int acl_addr(const char *aspec, struct access_control_addr *aca)
785 char *acl_spec = NULL;
791 * Use a temporary acl spec copy so we can log
792 * the unmodified original in case of parse errors.
794 acl_spec = strdup(aspec);
795 if (acl_spec == NULL)
797 /* XXX: This will be logged as parse error. */
801 if ((p = strchr(acl_spec, '/')) != NULL)
804 if (ijb_isdigit(*p) == 0)
809 masklength = atoi(p);
812 if ((masklength < 0) || (masklength > 32))
818 if ((p = strchr(acl_spec, ':')) != NULL)
823 port = strtol(p, &endptr, 10);
825 if (port <= 0 || port > 65535 || *endptr != '\0')
832 aca->port = (unsigned long)port;
834 aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
837 if (aca->addr == INADDR_NONE)
839 /* XXX: This will be logged as parse error. */
843 /* build the netmask */
845 for (i=1; i <= masklength ; i++)
847 aca->mask |= (1U << (32 - i));
850 /* now mask off the host portion of the ip address
851 * (i.e. save on the network portion of the address).
853 aca->addr = aca->addr & aca->mask;
858 #endif /* def FEATURE_ACL */
861 /*********************************************************************
863 * Function : connect_port_is_forbidden
865 * Description : Check to see if CONNECT requests to the destination
866 * port of this request are forbidden. The check is
867 * independend of the actual request method.
870 * 1 : csp = Current client state (buffers, headers, etc...)
872 * Returns : True if yes, false otherwise.
874 *********************************************************************/
875 int connect_port_is_forbidden(const struct client_state *csp)
877 return ((csp->action->flags & ACTION_LIMIT_CONNECT) &&
878 !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT],
883 /*********************************************************************
885 * Function : block_url
887 * Description : Called from `chat'. Check to see if we need to block this.
890 * 1 : csp = Current client state (buffers, headers, etc...)
892 * Returns : NULL => unblocked, else HTTP block response
894 *********************************************************************/
895 struct http_response *block_url(struct client_state *csp)
897 struct http_response *rsp;
898 const char *new_content_type = NULL;
901 * If it's not blocked, don't block it ;-)
903 if ((csp->action->flags & ACTION_BLOCK) == 0)
907 if (csp->action->flags & ACTION_REDIRECT)
909 log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
912 * Else, prepare a response
914 if (NULL == (rsp = alloc_http_response()))
916 return cgi_error_memory();
920 * If it's an image-url, send back an image or redirect
921 * as specified by the relevant +image action
923 #ifdef FEATURE_IMAGE_BLOCKING
924 if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
928 /* determine HOW images should be blocked */
929 p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
931 if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
933 log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
935 #if 1 /* Two alternative strategies, use this one for now: */
937 /* and handle accordingly: */
938 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
940 rsp->status = strdup("403 Request blocked by Privoxy");
941 if (rsp->status == NULL)
943 free_http_response(rsp);
944 return cgi_error_memory();
946 rsp->body = bindup(image_pattern_data, image_pattern_length);
947 if (rsp->body == NULL)
949 free_http_response(rsp);
950 return cgi_error_memory();
952 rsp->content_length = image_pattern_length;
954 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
956 free_http_response(rsp);
957 return cgi_error_memory();
961 else if (0 == strcmpic(p, "blank"))
963 rsp->status = strdup("403 Request blocked by Privoxy");
964 if (rsp->status == NULL)
966 free_http_response(rsp);
967 return cgi_error_memory();
969 rsp->body = bindup(image_blank_data, image_blank_length);
970 if (rsp->body == NULL)
972 free_http_response(rsp);
973 return cgi_error_memory();
975 rsp->content_length = image_blank_length;
977 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
979 free_http_response(rsp);
980 return cgi_error_memory();
986 rsp->status = strdup("302 Local Redirect from Privoxy");
987 if (rsp->status == NULL)
989 free_http_response(rsp);
990 return cgi_error_memory();
993 if (enlist_unique_header(rsp->headers, "Location", p))
995 free_http_response(rsp);
996 return cgi_error_memory();
1000 #else /* Following code is disabled for now */
1002 /* and handle accordingly: */
1003 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
1005 p = CGI_PREFIX "send-banner?type=pattern";
1007 else if (0 == strcmpic(p, "blank"))
1009 p = CGI_PREFIX "send-banner?type=blank";
1011 rsp->status = strdup("302 Local Redirect from Privoxy");
1012 if (rsp->status == NULL)
1014 free_http_response(rsp);
1015 return cgi_error_memory();
1018 if (enlist_unique_header(rsp->headers, "Location", p))
1020 free_http_response(rsp);
1021 return cgi_error_memory();
1023 #endif /* Preceeding code is disabled for now */
1025 else if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
1028 * Send empty document.
1030 new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
1033 rsp->body = strdup(" ");
1034 rsp->content_length = 1;
1036 rsp->status = strdup("403 Request blocked by Privoxy");
1037 if (rsp->status == NULL)
1039 free_http_response(rsp);
1040 return cgi_error_memory();
1042 if (new_content_type != 0)
1044 log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
1045 if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
1047 free_http_response(rsp);
1048 return cgi_error_memory();
1053 #endif /* def FEATURE_IMAGE_BLOCKING */
1056 * Else, generate an HTML "blocked" message:
1060 struct map * exports;
1064 * Workaround for stupid Netscape bug which prevents
1065 * pages from being displayed if loading a referenced
1066 * JavaScript or style sheet fails. So make it appear
1067 * as if it succeeded.
1069 if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
1070 && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
1071 && !strstr(p, "Gecko") /* save Mozilla, */
1072 && !strstr(p, "compatible") /* MSIE */
1073 && !strstr(p, "Opera")) /* and Opera. */
1075 rsp->status = strdup("200 Request for blocked URL");
1079 rsp->status = strdup("403 Request for blocked URL");
1082 if (rsp->status == NULL)
1084 free_http_response(rsp);
1085 return cgi_error_memory();
1088 exports = default_exports(csp, NULL);
1089 if (exports == NULL)
1091 free_http_response(rsp);
1092 return cgi_error_memory();
1095 #ifdef FEATURE_FORCE_LOAD
1096 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1098 * Export the force conditional block killer if
1100 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1101 * - Privoxy is configured to enforce blocks, or
1102 * - it's a CONNECT request and enforcing wouldn't work anyway.
1104 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1105 || (0 == strcmpic(csp->http->gpc, "connect")))
1106 #endif /* ndef FEATURE_FORCE_LOAD */
1108 err = map_block_killer(exports, "force-support");
1111 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1112 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
1113 if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
1114 if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
1117 const char *block_reason;
1118 if (csp->action->string[ACTION_STRING_BLOCK] != NULL)
1120 block_reason = csp->action->string[ACTION_STRING_BLOCK];
1124 assert(connect_port_is_forbidden(csp));
1125 block_reason = "Forbidden CONNECT port.";
1127 err = map(exports, "block-reason", 1, html_encode(block_reason), 0);
1132 free_http_response(rsp);
1133 return cgi_error_memory();
1136 err = template_fill_for_cgi(csp, "blocked", exports, rsp);
1139 free_http_response(rsp);
1140 return cgi_error_memory();
1143 rsp->reason = RSP_REASON_BLOCKED;
1145 return finish_http_response(csp, rsp);
1150 #ifdef FEATURE_TRUST
1151 /*********************************************************************
1153 * Function : trust_url FIXME: I should be called distrust_url
1155 * Description : Calls is_untrusted_url to determine if the URL is trusted
1156 * and if not, returns a HTTP 403 response with a reject message.
1159 * 1 : csp = Current client state (buffers, headers, etc...)
1161 * Returns : NULL => trusted, else http_response.
1163 *********************************************************************/
1164 struct http_response *trust_url(struct client_state *csp)
1166 struct http_response *rsp;
1167 struct map * exports;
1168 char buf[BUFFER_SIZE];
1170 struct url_spec **tl;
1175 * Don't bother to work on trusted URLs
1177 if (!is_untrusted_url(csp))
1183 * Else, prepare a response:
1185 if (NULL == (rsp = alloc_http_response()))
1187 return cgi_error_memory();
1190 rsp->status = strdup("403 Request blocked by Privoxy");
1191 exports = default_exports(csp, NULL);
1192 if (exports == NULL || rsp->status == NULL)
1194 free_http_response(rsp);
1195 return cgi_error_memory();
1199 * Export the protocol, host, port, and referrer information
1201 err = map(exports, "hostport", 1, csp->http->hostport, 1);
1202 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1203 if (!err) err = map(exports, "path", 1, csp->http->path, 1);
1205 if (NULL != (p = get_header_value(csp->headers, "Referer:")))
1207 if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
1211 if (!err) err = map(exports, "referrer", 1, "none set", 1);
1217 free_http_response(rsp);
1218 return cgi_error_memory();
1222 * Export the trust list
1225 for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
1227 snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
1228 string_append(&p, buf);
1230 err = map(exports, "trusted-referrers", 1, p, 0);
1235 free_http_response(rsp);
1236 return cgi_error_memory();
1240 * Export the trust info, if available
1242 if (csp->config->trust_info->first)
1244 struct list_entry *l;
1247 for (l = csp->config->trust_info->first; l ; l = l->next)
1249 snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
1250 string_append(&p, buf);
1252 err = map(exports, "trust-info", 1, p, 0);
1256 err = map_block_killer(exports, "have-trust-info");
1262 free_http_response(rsp);
1263 return cgi_error_memory();
1267 * Export the force conditional block killer if
1269 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1270 * - Privoxy is configured to enforce blocks, or
1271 * - it's a CONNECT request and enforcing wouldn't work anyway.
1273 #ifdef FEATURE_FORCE_LOAD
1274 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1275 || (0 == strcmpic(csp->http->gpc, "connect")))
1277 err = map_block_killer(exports, "force-support");
1281 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1283 #else /* ifndef FEATURE_FORCE_LOAD */
1284 err = map_block_killer(exports, "force-support");
1285 #endif /* ndef FEATURE_FORCE_LOAD */
1290 free_http_response(rsp);
1291 return cgi_error_memory();
1295 * Build the response
1297 err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
1300 free_http_response(rsp);
1301 return cgi_error_memory();
1303 rsp->reason = RSP_REASON_UNTRUSTED;
1305 return finish_http_response(csp, rsp);
1307 #endif /* def FEATURE_TRUST */
1310 /*********************************************************************
1312 * Function : compile_dynamic_pcrs_job_list
1314 * Description : Compiles a dynamic pcrs job list (one with variables
1315 * resolved at request time)
1318 * 1 : csp = Current client state (buffers, headers, etc...)
1319 * 2 : b = The filter list to compile
1321 * Returns : NULL in case of errors, otherwise the
1324 *********************************************************************/
1325 pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
1327 struct list_entry *pattern;
1328 pcrs_job *job_list = NULL;
1329 pcrs_job *dummy = NULL;
1330 pcrs_job *lastjob = NULL;
1333 const struct pcrs_variable variables[] =
1335 {"url", csp->http->url, 1},
1336 {"path", csp->http->path, 1},
1337 {"host", csp->http->host, 1},
1338 {"origin", csp->ip_addr_str, 1},
1342 for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
1344 assert(pattern->str != NULL);
1346 dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
1350 log_error(LOG_LEVEL_ERROR,
1351 "Adding filter job \'%s\' to dynamic filter %s failed: %s",
1352 pattern->str, b->name, pcrs_strerror(error));
1357 if (error == PCRS_WARN_TRUNCATION)
1359 log_error(LOG_LEVEL_ERROR,
1360 "At least one of the variables in \'%s\' had to "
1361 "be truncated before compilation", pattern->str);
1363 if (job_list == NULL)
1369 lastjob->next = dummy;
1379 /*********************************************************************
1381 * Function : rewrite_url
1383 * Description : Rewrites a URL with a single pcrs command
1384 * and returns the result if it differs from the
1385 * original and isn't obviously invalid.
1388 * 1 : old_url = URL to rewrite.
1389 * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
1392 * Returns : NULL if the pcrs_command didn't change the url, or
1393 * the result of the modification.
1395 *********************************************************************/
1396 char *rewrite_url(char *old_url, const char *pcrs_command)
1398 char *new_url = NULL;
1402 assert(pcrs_command);
1404 new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
1408 log_error(LOG_LEVEL_REDIRECTS,
1409 "pcrs command \"%s\" didn't change \"%s\".",
1410 pcrs_command, old_url);
1415 log_error(LOG_LEVEL_REDIRECTS,
1416 "executing pcrs command \"%s\" to rewrite %s failed: %s",
1417 pcrs_command, old_url, pcrs_strerror(hits));
1420 else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
1422 log_error(LOG_LEVEL_ERROR,
1423 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
1424 "but the result doesn't look like a valid URL and will be ignored.",
1425 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1430 log_error(LOG_LEVEL_REDIRECTS,
1431 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
1432 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1440 #ifdef FEATURE_FAST_REDIRECTS
1441 /*********************************************************************
1443 * Function : get_last_url
1445 * Description : Search for the last URL inside a string.
1446 * If the string already is a URL, it will
1447 * be the first URL found.
1450 * 1 : subject = the string to check
1451 * 2 : redirect_mode = +fast-redirect{} mode
1453 * Returns : NULL if no URL was found, or
1454 * the last URL found.
1456 *********************************************************************/
1457 char *get_last_url(char *subject, const char *redirect_mode)
1459 char *new_url = NULL;
1463 assert(redirect_mode);
1465 subject = strdup(subject);
1466 if (subject == NULL)
1468 log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
1472 if (0 == strcmpic(redirect_mode, "check-decoded-url"))
1474 log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
1475 new_url = url_decode(subject);
1476 if (new_url != NULL)
1483 log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
1487 log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
1490 * Find the last URL encoded in the request
1493 while ((tmp = strstr(tmp, "http://")) != NULL)
1497 tmp = (new_url != NULL) ? new_url : subject;
1498 while ((tmp = strstr(tmp, "https://")) != NULL)
1503 if ((new_url != NULL)
1504 && ( (new_url != subject)
1505 || (0 == strncmpic(subject, "http://", 7))
1506 || (0 == strncmpic(subject, "https://", 8))
1510 * Return new URL if we found a redirect
1511 * or if the subject already was a URL.
1513 * The second case makes sure that we can
1514 * chain get_last_url after another redirection check
1515 * (like rewrite_url) without losing earlier redirects.
1517 new_url = strdup(new_url);
1526 #endif /* def FEATURE_FAST_REDIRECTS */
1529 /*********************************************************************
1531 * Function : redirect_url
1533 * Description : Checks if Privoxy should answer the request with
1534 * a HTTP redirect and generates the redirect if
1538 * 1 : csp = Current client state (buffers, headers, etc...)
1540 * Returns : NULL if the request can pass, HTTP redirect otherwise.
1542 *********************************************************************/
1543 struct http_response *redirect_url(struct client_state *csp)
1545 struct http_response *rsp;
1546 #ifdef FEATURE_FAST_REDIRECTS
1548 * XXX: Do we still need FEATURE_FAST_REDIRECTS
1549 * as compile-time option? The user can easily disable
1550 * it in his action file.
1552 char * redirect_mode;
1553 #endif /* def FEATURE_FAST_REDIRECTS */
1554 char *old_url = NULL;
1555 char *new_url = NULL;
1556 char *redirection_string;
1558 if ((csp->action->flags & ACTION_REDIRECT))
1560 redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
1563 * If the redirection string begins with 's',
1564 * assume it's a pcrs command, otherwise treat it as
1565 * properly formatted URL and use it for the redirection
1568 * According to RFC 2616 section 14.30 the URL
1569 * has to be absolute and if the user tries:
1570 * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
1571 * she would get undefined results anyway.
1575 if (*redirection_string == 's')
1577 old_url = csp->http->url;
1578 new_url = rewrite_url(old_url, redirection_string);
1582 log_error(LOG_LEVEL_REDIRECTS,
1583 "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
1584 redirection_string);
1585 new_url = strdup(redirection_string);
1589 #ifdef FEATURE_FAST_REDIRECTS
1590 if ((csp->action->flags & ACTION_FAST_REDIRECTS))
1592 redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
1595 * If it exists, use the previously rewritten URL as input
1596 * otherwise just use the old path.
1598 old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
1599 new_url = get_last_url(old_url, redirect_mode);
1604 * Disable redirect checkers, so that they
1605 * will be only run more than once if the user
1606 * also enables them through tags.
1608 * From a performance point of view
1609 * it doesn't matter, but the duplicated
1610 * log messages are annoying.
1612 csp->action->flags &= ~ACTION_FAST_REDIRECTS;
1613 #endif /* def FEATURE_FAST_REDIRECTS */
1614 csp->action->flags &= ~ACTION_REDIRECT;
1616 /* Did any redirect action trigger? */
1619 if (0 == strcmpic(new_url, csp->http->url))
1621 log_error(LOG_LEVEL_ERROR,
1622 "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
1623 csp->http->url, new_url);
1628 log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
1630 if (NULL == (rsp = alloc_http_response()))
1633 return cgi_error_memory();
1636 if ( enlist_unique_header(rsp->headers, "Location", new_url)
1637 || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
1640 free_http_response(rsp);
1641 return cgi_error_memory();
1643 rsp->reason = RSP_REASON_REDIRECTED;
1646 return finish_http_response(csp, rsp);
1650 /* Only reached if no redirect is required */
1656 #ifdef FEATURE_IMAGE_BLOCKING
1657 /*********************************************************************
1659 * Function : is_imageurl
1661 * Description : Given a URL, decide whether it is an image or not,
1662 * using either the info from a previous +image action
1663 * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
1664 * is MSIE and not on a Mac, tell from the browser's accept
1668 * 1 : csp = Current client state (buffers, headers, etc...)
1670 * Returns : True (nonzero) if URL is an image, false (0)
1673 *********************************************************************/
1674 int is_imageurl(const struct client_state *csp)
1676 #ifdef FEATURE_IMAGE_DETECT_MSIE
1679 tmp = get_header_value(csp->headers, "User-Agent:");
1680 if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
1682 tmp = get_header_value(csp->headers, "Accept:");
1683 if (tmp && strstr(tmp, "image/gif"))
1685 /* Client will accept HTML. If this seems counterintuitive,
1695 #endif /* def FEATURE_IMAGE_DETECT_MSIE */
1697 return ((csp->action->flags & ACTION_IMAGE) != 0);
1700 #endif /* def FEATURE_IMAGE_BLOCKING */
1703 #ifdef FEATURE_TRUST
1704 /*********************************************************************
1706 * Function : is_untrusted_url
1708 * Description : Should we "distrust" this URL (and block it)?
1710 * Yes if it matches a line in the trustfile, or if the
1711 * referrer matches a line starting with "+" in the
1716 * 1 : csp = Current client state (buffers, headers, etc...)
1718 * Returns : 0 => trusted, 1 => untrusted
1720 *********************************************************************/
1721 int is_untrusted_url(const struct client_state *csp)
1723 struct file_list *fl;
1724 struct block_spec *b;
1725 struct url_spec **trusted_url;
1726 struct http_request rhttp[1];
1727 const char * referer;
1731 * If we don't have a trustlist, we trust everybody
1733 if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
1738 memset(rhttp, '\0', sizeof(*rhttp));
1741 * Do we trust the request URL itself?
1743 for (b = b->next; b ; b = b->next)
1745 if (url_match(b->url, csp->http))
1751 if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
1753 /* no referrer was supplied */
1759 * If not, do we maybe trust its referrer?
1761 err = parse_http_url(referer, rhttp, REQUIRE_PROTOCOL);
1767 for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
1769 if (url_match(*trusted_url, rhttp))
1771 /* if the URL's referrer is from a trusted referrer, then
1772 * add the target spec to the trustfile as an unblocked
1773 * domain and return 0 (which means it's OK).
1778 if (NULL != (fp = fopen(csp->config->trustfile, "a")))
1782 char * new_entry = strdup("~");
1784 string_append(&new_entry, csp->http->hostport);
1786 path = csp->http->path;
1787 if ( (path[0] == '/')
1789 && ((path_end = strchr(path + 2, '/')) != NULL))
1791 /* since this path points into a user's home space
1792 * be sure to include this spec in the trustfile.
1794 int path_len = path_end - path; /* save offset */
1795 path = strdup(path); /* Copy string */
1798 path_end = path + path_len; /* regenerate ptr to new buffer */
1799 *(path_end + 1) = '\0'; /* Truncate path after '/' */
1801 string_join(&new_entry, path);
1805 * Give a reason for generating this entry.
1807 string_append(&new_entry, " # Trusted referrer was: ");
1808 string_append(&new_entry, referer);
1810 if (new_entry != NULL)
1812 if (-1 == fprintf(fp, "%s\n", new_entry))
1814 log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
1815 new_entry, csp->config->trustfile);
1821 /* FIXME: No way to handle out-of memory, so mostly ignoring it */
1822 log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
1829 log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
1830 csp->http->hostport, csp->config->trustfile);
1838 #endif /* def FEATURE_TRUST */
1841 /*********************************************************************
1843 * Function : pcrs_filter_response
1845 * Description : Execute all text substitutions from all applying
1846 * +filter actions on the text buffer that's been
1847 * accumulated in csp->iob->buf.
1850 * 1 : csp = Current client state (buffers, headers, etc...)
1852 * Returns : a pointer to the (newly allocated) modified buffer.
1853 * or NULL if there were no hits or something went wrong
1855 *********************************************************************/
1856 static char *pcrs_filter_response(struct client_state *csp)
1859 size_t size, prev_size;
1865 struct file_list *fl;
1866 struct re_filterfile_spec *b;
1867 struct list_entry *filtername;
1869 int i, found_filters = 0;
1874 if (csp->iob->cur >= csp->iob->eod)
1880 * Need to check the set of re_filterfiles...
1882 for (i = 0; i < MAX_AF_FILES; i++)
1895 if (0 == found_filters)
1897 log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
1898 "content filtering enabled, but no content filters available.");
1902 size = (size_t)(csp->iob->eod - csp->iob->cur);
1903 old = csp->iob->cur;
1905 for (i = 0; i < MAX_AF_FILES; i++)
1908 if ((NULL == fl) || (NULL == fl->f))
1911 * Either there are no filter files
1912 * left, or this filter file just
1913 * contains no valid filters.
1915 * Continue to be sure we don't miss
1916 * valid filter files that are chained
1917 * after empty or invalid ones.
1922 * For all applying +filter actions, look if a filter by that
1923 * name exists and if yes, execute it's pcrs_joblist on the
1926 for (b = fl->f; b; b = b->next)
1928 if (b->type != FT_CONTENT_FILTER)
1930 /* Skip header filters */
1934 for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
1935 filtername ; filtername = filtername->next)
1937 if (strcmp(b->name, filtername->str) == 0)
1939 int current_hits = 0; /* Number of hits caused by this filter */
1940 int job_number = 0; /* Which job we're currently executing */
1941 int job_hits = 0; /* How many hits the current job caused */
1942 pcrs_job *joblist = b->joblist;
1944 if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
1946 if (NULL == joblist)
1948 log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
1953 /* Apply all jobs from the joblist */
1954 for (job = joblist; NULL != job; job = job->next)
1957 job_hits = pcrs_execute(job, old, size, &new, &size);
1962 * That went well. Continue filtering
1963 * and use the result of this job as
1964 * input for the next one.
1966 current_hits += job_hits;
1967 if (old != csp->iob->cur)
1976 * This job caused an unexpected error. Inform the user
1977 * and skip the rest of the jobs in this filter. We could
1978 * continue with the next job, but usually the jobs
1979 * depend on each other or are similar enough to
1980 * fail for the same reason.
1982 * At the moment our pcrs expects the error codes of pcre 3.4,
1983 * but newer pcre versions can return additional error codes.
1984 * As a result pcrs_strerror()'s error message might be
1985 * "Unknown error ...", therefore we print the numerical value
1988 * XXX: Is this important enough for LOG_LEVEL_ERROR or
1989 * should we use LOG_LEVEL_RE_FILTER instead?
1991 log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
1992 b->name, job_number, pcrs_strerror(job_hits), job_hits);
1997 if (b->dynamic) pcrs_free_joblist(joblist);
1999 log_error(LOG_LEVEL_RE_FILTER,
2000 "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
2001 csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
2003 hits += current_hits;
2010 * If there were no hits, destroy our copy and let
2011 * chat() use the original in csp->iob
2019 csp->flags |= CSP_FLAG_MODIFIED;
2020 csp->content_length = size;
2028 /*********************************************************************
2030 * Function : gif_deanimate_response
2032 * Description : Deanimate the GIF image that has been accumulated in
2033 * csp->iob->buf, set csp->content_length to the modified
2034 * size and raise the CSP_FLAG_MODIFIED flag.
2037 * 1 : csp = Current client state (buffers, headers, etc...)
2039 * Returns : a pointer to the (newly allocated) modified buffer.
2040 * or NULL in case something went wrong.
2042 *********************************************************************/
2043 static char *gif_deanimate_response(struct client_state *csp)
2045 struct binbuffer *in, *out;
2049 size = (size_t)(csp->iob->eod - csp->iob->cur);
2051 if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
2052 || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
2054 log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
2058 in->buffer = csp->iob->cur;
2061 if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
2063 log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
2070 if ((int)size == out->offset)
2072 log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
2076 log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
2078 csp->content_length = out->offset;
2079 csp->flags |= CSP_FLAG_MODIFIED;
2089 /*********************************************************************
2091 * Function : get_filter_function
2093 * Description : Decides which content filter function has
2094 * to be applied (if any).
2097 * 1 : csp = Current client state (buffers, headers, etc...)
2099 * Returns : The content filter function to run, or
2100 * NULL if no content filter is active
2102 *********************************************************************/
2103 filter_function_ptr get_filter_function(struct client_state *csp)
2105 filter_function_ptr filter_function = NULL;
2108 * Are we enabling text mode by force?
2110 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
2113 * Do we really have to?
2115 if (csp->content_type & CT_TEXT)
2117 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
2121 csp->content_type |= CT_TEXT;
2122 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
2126 if (!(csp->content_type & CT_DECLARED))
2129 * The server didn't bother to declare a MIME-Type.
2130 * Assume it's text that can be filtered.
2132 * This also regulary happens with 304 responses,
2133 * therefore logging anything here would cause
2136 csp->content_type |= CT_TEXT;
2140 * Choose the applying filter function based on
2141 * the content type and action settings.
2143 if ((csp->content_type & CT_TEXT) &&
2144 (csp->rlist != NULL) &&
2145 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
2147 filter_function = pcrs_filter_response;
2149 else if ((csp->content_type & CT_GIF) &&
2150 (csp->action->flags & ACTION_DEANIMATE))
2152 filter_function = gif_deanimate_response;
2155 return filter_function;
2159 /*********************************************************************
2161 * Function : remove_chunked_transfer_coding
2163 * Description : In-situ remove the "chunked" transfer coding as defined
2164 * in rfc2616 from a buffer.
2167 * 1 : buffer = Pointer to the text buffer
2168 * 2 : size = In: Number of bytes to be processed,
2169 * Out: Number of bytes after de-chunking.
2170 * (undefined in case of errors)
2172 * Returns : JB_ERR_OK for success,
2173 * JB_ERR_PARSE otherwise
2175 *********************************************************************/
2176 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
2179 unsigned int chunksize = 0;
2180 char *from_p, *to_p;
2183 from_p = to_p = buffer;
2185 if (sscanf(buffer, "%x", &chunksize) != 1)
2187 log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
2188 return JB_ERR_PARSE;
2191 while (chunksize > 0U)
2193 if (NULL == (from_p = strstr(from_p, "\r\n")))
2195 log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
2196 return JB_ERR_PARSE;
2199 if ((newsize += chunksize) >= *size)
2201 log_error(LOG_LEVEL_ERROR,
2202 "Chunk size %d exceeds buffer size %d in \"chunked\" transfer coding",
2204 return JB_ERR_PARSE;
2208 memmove(to_p, from_p, (size_t) chunksize);
2209 to_p = buffer + newsize;
2210 from_p += chunksize + 2;
2212 if (sscanf(from_p, "%x", &chunksize) != 1)
2214 log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
2219 /* XXX: Should get its own loglevel. */
2220 log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
2229 /*********************************************************************
2231 * Function : prepare_for_filtering
2233 * Description : If necessary, de-chunks and decompresses
2234 * the content so it can get filterd.
2237 * 1 : csp = Current client state (buffers, headers, etc...)
2239 * Returns : JB_ERR_OK for success,
2240 * JB_ERR_PARSE otherwise
2242 *********************************************************************/
2243 static jb_err prepare_for_filtering(struct client_state *csp)
2245 jb_err err = JB_ERR_OK;
2248 * If the body has a "chunked" transfer-encoding,
2249 * get rid of it, adjusting size and iob->eod
2251 if (csp->flags & CSP_FLAG_CHUNKED)
2253 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
2255 log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
2256 err = remove_chunked_transfer_coding(csp->iob->cur, &size);
2257 if (JB_ERR_OK == err)
2259 csp->iob->eod = csp->iob->cur + size;
2260 csp->flags |= CSP_FLAG_MODIFIED;
2264 return JB_ERR_PARSE;
2270 * If the body has a supported transfer-encoding,
2271 * decompress it, adjusting size and iob->eod.
2273 if (csp->content_type & (CT_GZIP|CT_DEFLATE))
2275 if (0 == csp->iob->eod - csp->iob->cur)
2277 /* Nothing left after de-chunking. */
2281 err = decompress_iob(csp);
2283 if (JB_ERR_OK == err)
2285 csp->flags |= CSP_FLAG_MODIFIED;
2286 csp->content_type &= ~CT_TABOO;
2291 * Unset CT_GZIP and CT_DEFLATE to remember not
2292 * to modify the Content-Encoding header later.
2294 csp->content_type &= ~CT_GZIP;
2295 csp->content_type &= ~CT_DEFLATE;
2304 /*********************************************************************
2306 * Function : execute_content_filter
2308 * Description : Executes a given content filter.
2311 * 1 : csp = Current client state (buffers, headers, etc...)
2312 * 2 : content_filter = The filter function to execute
2314 * Returns : Pointer to the modified buffer, or
2315 * NULL if filtering failed or wasn't necessary.
2317 *********************************************************************/
2318 char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
2320 if (0 == csp->iob->eod - csp->iob->cur)
2323 * No content (probably status code 301, 302 ...),
2324 * no filtering necessary.
2329 if (JB_ERR_OK != prepare_for_filtering(csp))
2332 * failed to de-chunk or decompress.
2337 if (0 == csp->iob->eod - csp->iob->cur)
2340 * Clown alarm: chunked and/or compressed nothing delivered.
2345 return ((*content_filter)(csp));
2349 /*********************************************************************
2351 * Function : get_url_actions
2353 * Description : Gets the actions for this URL.
2356 * 1 : csp = Current client state (buffers, headers, etc...)
2357 * 2 : http = http_request request for blocked URLs
2361 *********************************************************************/
2362 void get_url_actions(struct client_state *csp, struct http_request *http)
2364 struct file_list *fl;
2365 struct url_actions *b;
2368 init_current_action(csp->action);
2370 for (i = 0; i < MAX_AF_FILES; i++)
2372 if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
2377 apply_url_actions(csp->action, http, b);
2384 /*********************************************************************
2386 * Function : apply_url_actions
2388 * Description : Applies a list of URL actions.
2391 * 1 : action = Destination.
2392 * 2 : http = Current URL
2393 * 3 : b = list of URL actions to apply
2397 *********************************************************************/
2398 void apply_url_actions(struct current_action_spec *action,
2399 struct http_request *http,
2400 struct url_actions *b)
2404 /* Should never happen */
2408 for (b = b->next; NULL != b; b = b->next)
2410 if (url_match(b->url, http))
2412 merge_current_action(action, b->action);
2418 /*********************************************************************
2420 * Function : get_forward_override_settings
2422 * Description : Returns forward settings as specified with the
2423 * forward-override{} action. forward-override accepts
2424 * forward lines similar to the one used in the
2425 * configuration file, but without the URL pattern.
2431 * in the configuration file can be replaced with
2432 * the action section:
2434 * {+forward-override{forward .}}
2438 * 1 : csp = Current client state (buffers, headers, etc...)
2440 * Returns : Pointer to forwarding structure in case of success.
2441 * Invalid syntax is fatal.
2443 *********************************************************************/
2444 const static struct forward_spec *get_forward_override_settings(struct client_state *csp)
2446 const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
2447 char forward_settings[BUFFER_SIZE];
2448 char *http_parent = NULL;
2449 /* variable names were chosen for consistency reasons. */
2450 struct forward_spec *fwd = NULL;
2454 assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
2455 /* Should be enforced by load_one_actions_file() */
2456 assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
2458 /* Create a copy ssplit can modify */
2459 strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
2461 if (NULL != csp->fwd)
2464 * XXX: Currently necessary to prevent memory
2465 * leaks when the show-url-info cgi page is visited.
2467 unload_forward_spec(csp->fwd);
2471 * allocate a new forward node, valid only for
2472 * the lifetime of this request. Save its location
2473 * in csp as well, so sweep() can free it later on.
2475 fwd = csp->fwd = zalloc(sizeof(*fwd));
2478 log_error(LOG_LEVEL_FATAL,
2479 "can't allocate memory for forward-override{%s}", forward_override_line);
2480 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2484 vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
2485 if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
2487 fwd->type = SOCKS_NONE;
2489 /* Parse the parent HTTP proxy host:port */
2490 http_parent = vec[1];
2493 else if (vec_count == 3)
2495 char *socks_proxy = NULL;
2497 if (!strcasecmp(vec[0], "forward-socks4"))
2499 fwd->type = SOCKS_4;
2500 socks_proxy = vec[1];
2502 else if (!strcasecmp(vec[0], "forward-socks4a"))
2504 fwd->type = SOCKS_4A;
2505 socks_proxy = vec[1];
2507 else if (!strcasecmp(vec[0], "forward-socks5"))
2509 fwd->type = SOCKS_5;
2510 socks_proxy = vec[1];
2513 if (NULL != socks_proxy)
2515 /* Parse the SOCKS proxy host[:port] */
2516 fwd->gateway_host = strdup(socks_proxy);
2518 if (NULL != (socks_proxy = strchr(fwd->gateway_host, ':')))
2520 *socks_proxy++ = '\0';
2521 fwd->gateway_port = strtol(socks_proxy, NULL, 0);
2524 if (fwd->gateway_port <= 0)
2526 fwd->gateway_port = 1080;
2529 http_parent = vec[2];
2533 if (NULL == http_parent)
2535 log_error(LOG_LEVEL_FATAL,
2536 "Invalid forward-override syntax in: %s", forward_override_line);
2537 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2540 /* Parse http forwarding settings */
2541 if (strcmp(http_parent, ".") != 0)
2543 fwd->forward_host = strdup(http_parent);
2545 if (NULL != (http_parent = strchr(fwd->forward_host, ':')))
2547 *http_parent++ = '\0';
2548 fwd->forward_port = strtol(http_parent, NULL, 0);
2551 if (fwd->forward_port <= 0)
2553 fwd->forward_port = 8000;
2557 assert (NULL != fwd);
2559 log_error(LOG_LEVEL_CONNECT,
2560 "Overriding forwarding settings based on \'%s\'", forward_override_line);
2566 /*********************************************************************
2568 * Function : forward_url
2570 * Description : Should we forward this to another proxy?
2573 * 1 : csp = Current client state (buffers, headers, etc...)
2574 * 2 : http = http_request request for current URL
2576 * Returns : Pointer to forwarding information.
2578 *********************************************************************/
2579 const struct forward_spec *forward_url(struct client_state *csp,
2580 const struct http_request *http)
2582 static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
2583 struct forward_spec *fwd = csp->config->forward;
2585 if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
2587 return get_forward_override_settings(csp);
2597 if (url_match(fwd->url, http))
2608 /*********************************************************************
2610 * Function : direct_response
2612 * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
2613 * request and if so, return a HTTP 501 to the client.
2615 * FIXME: I have a stupid name and I should handle the
2616 * requests properly. Still, what we do here is rfc-
2617 * compliant, whereas ignoring or forwarding are not.
2620 * 1 : csp = Current client state (buffers, headers, etc...)
2622 * Returns : http_response if , NULL if nonmatch or handler fail
2624 *********************************************************************/
2625 struct http_response *direct_response(struct client_state *csp)
2627 struct http_response *rsp;
2628 struct list_entry *p;
2630 if ((0 == strcmpic(csp->http->gpc, "trace"))
2631 || (0 == strcmpic(csp->http->gpc, "options")))
2633 for (p = csp->headers->first; (p != NULL) ; p = p->next)
2635 if (!strncmpic("Max-Forwards:", p->str, 13))
2637 unsigned int max_forwards;
2640 * If it's a Max-Forwards value of zero,
2641 * we have to intercept the request.
2643 if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
2646 * FIXME: We could handle at least TRACE here,
2647 * but that would require a verbatim copy of
2648 * the request which we don't have anymore
2650 log_error(LOG_LEVEL_HEADER,
2651 "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
2654 /* Get mem for response or fail*/
2655 if (NULL == (rsp = alloc_http_response()))
2657 return cgi_error_memory();
2660 if (NULL == (rsp->status = strdup("501 Not Implemented")))
2662 free_http_response(rsp);
2663 return cgi_error_memory();
2667 rsp->reason = RSP_REASON_UNSUPPORTED;
2669 return(finish_http_response(csp, rsp));
2678 /*********************************************************************
2680 * Function : content_filters_enabled
2682 * Description : Checks whether there are any content filters
2683 * enabled for the current request.
2686 * 1 : action = Action spec to check.
2688 * Returns : TRUE for yes, FALSE otherwise
2690 *********************************************************************/
2691 int content_filters_enabled(const struct current_action_spec *action)
2693 return ((action->flags & ACTION_DEANIMATE) ||
2694 !list_is_empty(action->multi[ACTION_MULTI_FILTER]));