1 const char filters_rcs[] = "$Id: filters.c,v 1.110 2008/11/10 16:40:25 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 1.110 2008/11/10 16:40:25 fabiankeil
44 * Fix a gcc44 warning.
46 * Revision 1.109 2008/11/08 15:48:41 fabiankeil
47 * Mention actual values when complaining about
48 * the chunk size exceeding the buffer size.
50 * Revision 1.108 2008/05/21 15:35:08 fabiankeil
51 * - Mark csp as immutable for block_acl().
52 * - Remove an obsolete complaint about filter_popups().
54 * Revision 1.107 2008/05/04 17:52:56 fabiankeil
55 * Adjust parse_http_url() call to new prototype.
57 * Revision 1.106 2008/05/03 16:40:44 fabiankeil
58 * Change content_filters_enabled()'s parameter from
59 * csp->action to action so it can be also used in the
60 * CGI code. Don't bother checking if there are filters
61 * loaded, as that's somewhat besides the point.
63 * Revision 1.105 2008/03/28 15:13:39 fabiankeil
64 * Remove inspect-jpegs action.
66 * Revision 1.104 2008/03/27 18:27:24 fabiankeil
67 * Remove kill-popups action.
69 * Revision 1.103 2008/03/06 16:33:45 fabiankeil
70 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
72 * Revision 1.102 2008/03/01 14:00:44 fabiankeil
73 * Let the block action take the reason for the block
74 * as argument and show it on the "blocked" page.
76 * Revision 1.101 2008/02/23 16:57:12 fabiankeil
77 * Rename url_actions() to get_url_actions() and let it
78 * use the standard parameter ordering.
80 * Revision 1.100 2008/02/23 16:33:43 fabiankeil
81 * Let forward_url() use the standard parameter ordering
82 * and mark its second parameter immutable.
84 * Revision 1.99 2008/02/03 13:57:58 fabiankeil
85 * Add SOCKS5 support for forward-override{}.
87 * Revision 1.98 2008/01/04 17:43:45 fabiankeil
88 * Improve the warning messages that get logged if the action files
89 * "enable" filters but no filters of that type have been loaded.
91 * Revision 1.97 2007/11/30 15:37:03 fabiankeil
92 * Use freez instead of free.
94 * Revision 1.96 2007/10/19 16:53:28 fabiankeil
95 * Add helper function to check if any content filters are enabled.
97 * Revision 1.95 2007/10/17 19:31:20 fabiankeil
98 * Omitting the zero chunk that ends the chunk transfer encoding seems
99 * to be the new black. Log the problem and continue filtering anyway.
101 * Revision 1.94 2007/09/29 13:20:20 fabiankeil
102 * Remove two redundant and one useless log messages.
104 * Revision 1.93 2007/09/29 10:21:16 fabiankeil
105 * - Move get_filter_function() from jcc.c to filters.c
106 * so the filter functions can be static.
107 * - Don't bother filtering body-less responses.
109 * Revision 1.92 2007/09/28 16:38:55 fabiankeil
110 * - Execute content filters through execute_content_filter().
111 * - Add prepare_for_filtering() so filter functions don't have to
112 * care about de-chunking and decompression. As a side effect this enables
113 * decompression for gif_deanimate_response() and jpeg_inspect_response().
114 * - Change remove_chunked_transfer_coding()'s return type to jb_err.
115 * Some clowns feel like chunking empty responses in which case
116 * (size == 0) is valid but previously would be interpreted as error.
118 * Revision 1.91 2007/09/02 15:31:20 fabiankeil
119 * Move match_portlist() from filter.c to urlmatch.c.
120 * It's used for url matching, not for filtering.
122 * Revision 1.90 2007/09/02 12:44:17 fabiankeil
123 * Remove newline at the end of a log_error() message.
125 * Revision 1.89 2007/08/05 13:42:23 fabiankeil
126 * #1763173 from Stefan Huehner: declare some more functions static.
128 * Revision 1.88 2007/06/01 16:41:11 fabiankeil
129 * Add forward-override{} to change the forwarding settings through
130 * action sections. This is mainly interesting to forward different
131 * clients differently (for example based on User-Agent or request
134 * Revision 1.87 2007/04/30 15:53:10 fabiankeil
135 * Make sure filters with dynamic jobs actually use them.
137 * Revision 1.86 2007/04/30 15:03:28 fabiankeil
138 * - Introduce dynamic pcrs jobs that can resolve variables.
139 * - Don't run redirect functions more than once,
140 * unless they are activated more than once.
142 * Revision 1.85 2007/03/21 12:24:47 fabiankeil
143 * - Log the content size after decompression in decompress_iob()
144 * instead of pcrs_filter_response().
146 * Revision 1.84 2007/03/20 15:16:34 fabiankeil
147 * Use dedicated header filter actions instead of abusing "filter".
148 * Replace "filter-client-headers" and "filter-client-headers"
149 * with "server-header-filter" and "client-header-filter".
151 * Revision 1.83 2007/03/17 15:20:05 fabiankeil
152 * New config option: enforce-blocks.
154 * Revision 1.82 2007/03/13 11:28:43 fabiankeil
155 * - Fix port handling in acl_addr() and use a temporary acl spec
156 * copy so error messages don't contain a truncated version.
157 * - Log size of iob before and after decompression.
159 * Revision 1.81 2007/03/05 14:40:53 fabiankeil
160 * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
161 * - Hide the "Go there anyway" link for blocked CONNECT
162 * requests where going there anyway doesn't work anyway.
164 * Revision 1.80 2007/02/07 10:55:20 fabiankeil
165 * - Save the reason for generating http_responses.
166 * - Block (+block) with status code 403 instead of 404.
167 * - Use a different kludge to remember a failed decompression.
169 * Revision 1.79 2007/01/31 16:21:38 fabiankeil
170 * Search for Max-Forwards headers case-insensitive,
171 * don't generate the "501 unsupported" message for invalid
172 * Max-Forwards values and don't increase negative ones.
174 * Revision 1.78 2007/01/28 13:41:18 fabiankeil
175 * - Add HEAD support to finish_http_response.
176 * - Add error favicon to internal HTML error messages.
178 * Revision 1.77 2007/01/12 15:36:44 fabiankeil
179 * Mark *csp as immutable for is_untrusted_url()
180 * and is_imageurl(). Closes FR 1237736.
182 * Revision 1.76 2007/01/01 19:36:37 fabiankeil
183 * Integrate a modified version of Wil Mahan's
184 * zlib patch (PR #895531).
186 * Revision 1.75 2006/12/29 18:30:46 fabiankeil
187 * Fixed gcc43 conversion warnings,
188 * changed sprintf calls to snprintf.
190 * Revision 1.74 2006/12/24 17:37:38 fabiankeil
191 * Adjust comment in pcrs_filter_response()
192 * to recent pcrs changes. Hohoho.
194 * Revision 1.73 2006/12/23 16:01:02 fabiankeil
195 * Don't crash if pcre returns an error code
196 * that pcrs didn't expect. Fixes BR 1621173.
198 * Revision 1.72 2006/12/22 18:52:53 fabiankeil
199 * Modified is_untrusted_url to complain in case of
200 * write errors and to give a reason when adding new
201 * entries to the trustfile. Closes FR 1097611.
203 * Revision 1.71 2006/12/22 14:24:52 fabiankeil
204 * Skip empty filter files in pcrs_filter_response,
205 * but don't ignore the ones that come afterwards.
206 * Fixes parts of BR 1619208.
208 * Revision 1.70 2006/12/09 13:33:15 fabiankeil
209 * Added some sanity checks for get_last_url().
210 * Fixed possible segfault caused by my last commit.
212 * Revision 1.69 2006/12/08 12:39:13 fabiankeil
213 * Let get_last_url() catch https URLs as well.
215 * Revision 1.68 2006/12/05 14:45:48 fabiankeil
216 * Make sure get_last_url() behaves like advertised
217 * and fast-redirects{} can be combined with redirect{}.
219 * Revision 1.67 2006/11/28 15:19:43 fabiankeil
220 * Implemented +redirect{s@foo@bar@} to generate
221 * a redirect based on a rewritten version of the
224 * Revision 1.66 2006/09/23 13:26:38 roro
225 * Replace TABs by spaces in source code.
227 * Revision 1.65 2006/09/21 12:54:43 fabiankeil
228 * Fix +redirect{}. Didn't work with -fast-redirects.
230 * Revision 1.64 2006/08/31 10:55:49 fabiankeil
231 * Block requests for untrusted URLs with status
232 * code 403 instead of 200.
234 * Revision 1.63 2006/08/31 10:11:28 fabiankeil
235 * Don't free p which is still in use and will be later
236 * freed by free_map(). Don't claim the referrer is unknown
237 * when the client didn't set one.
239 * Revision 1.62 2006/08/14 00:27:47 david__schmidt
240 * Feature request 595948: Re-Filter logging in single line
242 * Revision 1.61 2006/08/03 02:46:41 david__schmidt
243 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
245 * Revision 1.60 2006/07/18 14:48:46 david__schmidt
246 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
247 * with what was really the latest development (the v_3_0_branch branch)
249 * Revision 1.58.2.9 2006/01/29 23:10:56 david__schmidt
250 * Multiple filter file support
252 * Revision 1.58.2.8 2005/05/07 21:50:55 david__schmidt
253 * A few memory leaks plugged (mostly on error paths)
255 * Revision 1.58.2.7 2004/10/03 12:53:32 david__schmidt
256 * Add the ability to check jpeg images for invalid
257 * lengths of comment blocks. Defensive strategy
258 * against the exploit:
259 * Microsoft Security Bulletin MS04-028
260 * Buffer Overrun in JPEG Processing (GDI+) Could
261 * Allow Code Execution (833987)
262 * Enabled with +inspect-jpegs in actions files.
264 * Revision 1.58.2.6 2003/12/06 22:18:27 gliptak
265 * Correcting compile problem with FEATURE_IMAGE_BLOCKING
267 * Revision 1.58.2.5 2003/11/11 13:10:31 oes
268 * Fixed bug #839859: "See why" link URL now gets url-encoded.
270 * Revision 1.58.2.4 2003/02/28 12:52:45 oes
273 * Revision 1.58.2.3 2002/09/25 14:51:51 oes
274 * Added basic support for OPTIONS and TRACE HTTP methods:
275 * New function direct_response which handles OPTIONS and
276 * TRACE requests whose Max-Forwards header field is zero.
278 * Revision 1.58.2.2 2002/08/01 17:18:28 oes
279 * Fixed BR 537651 / SR 579724 (MSIE image detect improper for IE/Mac)
281 * Revision 1.58.2.1 2002/07/26 15:18:53 oes
282 * - Bugfix: Executing a filters without jobs no longer results in
283 * turing off *all* filters.
284 * - Security fix: Malicious web servers can't cause a seg fault
285 * through bogus chunk sizes anymore
287 * Revision 1.58 2002/04/24 02:11:17 oes
288 * Jon's multiple AF patch: url_actions now evaluates rules
291 * Revision 1.57 2002/04/08 20:38:34 swa
294 * Revision 1.56 2002/04/05 15:51:24 oes
295 * - bugfix: error-pages now get correct request protocol
296 * - fix for invalid HTML in trust info
298 * Revision 1.55 2002/04/02 16:13:51 oes
299 * Fix: No "Go there anyway" for SSL
301 * Revision 1.54 2002/04/02 14:55:56 oes
302 * Bugfix: is_untrusted_url() now depends on FEATURE_TRUST, not FEATURE_COOKIE_JAR
304 * Revision 1.53 2002/03/26 22:29:54 swa
305 * we have a new homepage!
307 * Revision 1.52 2002/03/24 16:35:57 jongfoster
310 * Revision 1.51 2002/03/24 15:23:33 jongfoster
313 * Revision 1.50 2002/03/24 13:25:43 swa
314 * name change related issues
316 * Revision 1.49 2002/03/16 20:29:14 oes
319 * Revision 1.48 2002/03/13 20:25:34 oes
320 * Better logging for content filters
322 * Revision 1.47 2002/03/13 00:30:52 jongfoster
324 * Added option of always sending redirect for imageblock,
325 * currently disabled with #if 0.
327 * Revision 1.46 2002/03/12 01:42:49 oes
328 * Introduced modular filters
330 * Revision 1.45 2002/03/08 16:47:50 oes
331 * Added choice beween GIF and PNG built-in images
333 * Revision 1.44 2002/03/07 03:49:31 oes
334 * - Fixed compiler warnings etc
335 * - Changed built-in images from GIF to PNG
336 * (with regard to Unisys patent issue)
337 * - Added a 4x4 pattern PNG which is less intrusive
338 * than the logo but also clearly marks the deleted banners
340 * Revision 1.43 2002/01/22 23:51:59 jongfoster
341 * Replacing strsav() with the safer string_append().
343 * Adding missing html_encode() to error message generators. Where encoded
344 * and unencoded versions of a string were provided, removing the unencoded
347 * Revision 1.42 2002/01/17 21:00:32 jongfoster
348 * Moving all our URL and URL pattern parsing code to urlmatch.c.
350 * Using a single, simple url_match(pattern,url) function - rather than
351 * the 3-line match routine which was repeated all over the place.
353 * Renaming free_url to free_url_spec, since it frees a struct url_spec.
355 * Using parse_http_url() to parse URLs without faking a HTTP
356 * request line for parse_http_request().
358 * Revision 1.41 2001/11/13 00:14:07 jongfoster
359 * Fixing stupid bug now I've figured out what || means.
360 * (It always returns 0 or 1, not one of it's paramaters.)
362 * Revision 1.40 2001/10/26 17:37:55 oes
363 * - Re-enabled Netscape 200/404 bug workaround in block_url():
364 * - Removed OS/2 special case
365 * - Made block_url() independant from sed() having been run
366 * - Made trust_url independant from sed() having been run
367 * - Made is_imageurl independant from sed() having been run.
368 * It now checks User-Agent: and Accept: by itself.
371 * Revision 1.39 2001/10/25 03:40:48 david__schmidt
372 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
373 * threads to call select() simultaneously. So, it's time to do a real, live,
374 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
375 * (native). Both versions will work, but using __OS2__ offers multi-threading.
377 * Revision 1.38 2001/10/23 21:32:33 jongfoster
378 * Adding error-checking to selected functions
380 * Revision 1.37 2001/10/22 15:33:56 david__schmidt
381 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
382 * filters.c. Added a FIXME in front of the offending code. I'll gladly
383 * put in a better/more robust fix for all parties if one is presented...
384 * It seems that just returning 200 instead of 404 would pretty much fix
385 * it for everyone, but I don't know all the history of the problem.
387 * Revision 1.36 2001/10/10 16:44:16 oes
388 * Added match_portlist function
390 * Revision 1.35 2001/10/07 15:41:23 oes
391 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
393 * New function remove_chunked_transfer_coding that strips chunked
394 * transfer coding to plain and is called by pcrs_filter_response
395 * and gif_deanimate_response if neccessary
397 * Improved handling of zero-change re_filter runs
399 * pcrs_filter_response and gif_deanimate_response now remove
400 * chunked transfer codeing before processing the body.
402 * Revision 1.34 2001/09/20 15:49:36 steudten
404 * Fix BUG: Change int size to size_t size in pcrs_filter_response().
405 * See cgi.c fill_template().
407 * Revision 1.33 2001/09/16 17:05:14 jongfoster
408 * Removing unused #include showarg.h
410 * Revision 1.32 2001/09/16 13:21:27 jongfoster
411 * Changes to use new list functions.
413 * Revision 1.31 2001/09/16 11:38:02 jongfoster
414 * Splitting fill_template() into 2 functions:
415 * template_load() loads the file
416 * template_fill() performs the PCRS regexps.
417 * This is because the CGI edit interface has a "table row"
418 * template which is used many times in the page - this
419 * change means it's only loaded from disk once.
421 * Revision 1.30 2001/09/16 11:00:10 jongfoster
422 * New function alloc_http_response, for symmetry with free_http_response
424 * Revision 1.29 2001/09/13 23:32:40 jongfoster
425 * Moving image data to cgi.c rather than cgi.h
426 * Fixing a GPF under Win32 (and any other OS that protects global
427 * constants from being written to).
429 * Revision 1.28 2001/09/10 10:18:51 oes
430 * Silenced compiler warnings
432 * Revision 1.27 2001/08/05 16:06:20 jongfoster
433 * Modifiying "struct map" so that there are now separate header and
434 * "map_entry" structures. This means that functions which modify a
435 * map no longer need to return a pointer to the modified map.
436 * Also, it no longer reverses the order of the entries (which may be
437 * important with some advanced template substitutions).
439 * Revision 1.26 2001/07/30 22:08:36 jongfoster
440 * Tidying up #defines:
441 * - All feature #defines are now of the form FEATURE_xxx
442 * - Permanently turned off WIN_GUI_EDIT
443 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
445 * Revision 1.25 2001/07/26 10:09:46 oes
446 * Made browser detection a little less naive
448 * Revision 1.24 2001/07/25 17:22:51 oes
449 * Added workaround for Netscape bug that prevents display of page when loading a component fails.
451 * Revision 1.23 2001/07/23 13:40:12 oes
452 * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
454 * Revision 1.22 2001/07/18 12:29:34 oes
455 * - Made gif_deanimate_response respect
456 * csp->action->string[ACTION_STRING_DEANIMATE]
457 * - Logging cosmetics
459 * Revision 1.21 2001/07/13 13:59:53 oes
460 * - Introduced gif_deanimate_response which shares the
461 * generic content modification interface of pcrs_filter_response
462 * and acts as a wrapper to deanimate.c:gif_deanimate()
463 * - Renamed re_process_buffer to pcrs_filter_response
464 * - pcrs_filter_response now returns NULL on failiure
465 * - Removed all #ifdef PCRS
467 * Revision 1.20 2001/07/01 17:01:04 oes
468 * Added comments and missing return statement in is_untrusted_url()
470 * Revision 1.19 2001/06/29 21:45:41 oes
471 * Indentation, CRLF->LF, Tab-> Space
473 * Revision 1.18 2001/06/29 13:27:38 oes
474 * - Cleaned up, renamed and reorderd functions
475 * and improved comments
478 * - Ported to CGI platform. Now delivers
479 * http_response or NULL
480 * - Unified HTML and GIF generation (moved image detection
481 * and GIF generation here from jcc.c:chat())
482 * - Fixed HTTP status to:
483 * - 403 (Forbidden) for the "blocked" HTML message
484 * - 200 (OK) for GIF answers
485 * - 302 (Redirect) for redirect to GIF
488 * - Ported to CGI platform. Now delivers
489 * http_response or NULL
490 * - Separated detection of untrusted URL into
491 * (bool)is_untrusted_url
492 * - Added enforcement of untrusted requests
494 * - Moved redirect_url() from cgi.c to here
495 * and ported it to the CGI platform
497 * - Removed logentry from cancelled commit
499 * Revision 1.17 2001/06/09 10:55:28 jongfoster
500 * Changing BUFSIZ ==> BUFFER_SIZE
502 * Revision 1.16 2001/06/07 23:10:26 jongfoster
503 * Allowing unanchored domain patterns to back off and retry
504 * if they partially match. Optimized right-anchored patterns.
505 * Moving ACL and forward files into config file.
506 * Replacing struct gateway with struct forward_spec
508 * Revision 1.15 2001/06/03 19:12:00 oes
509 * extracted-CGI relevant stuff
511 * Revision 1.14 2001/06/01 10:30:55 oes
512 * Added optional left-anchoring to domaincmp
514 * Revision 1.13 2001/05/31 21:21:30 jongfoster
515 * Permissionsfile / actions file changes:
516 * - Changed "permission" to "action" throughout
517 * - changes to file format to allow string parameters
518 * - Moved helper functions to actions.c
520 * Revision 1.12 2001/05/31 17:35:20 oes
522 * - Enhanced domain part globbing with infix and prefix asterisk
523 * matching and optional unanchored operation
525 * Revision 1.11 2001/05/29 11:53:23 oes
526 * "See why" link added to "blocked" page
528 * Revision 1.10 2001/05/29 09:50:24 jongfoster
529 * Unified blocklist/imagelist/permissionslist.
530 * File format is still under discussion, but the internal changes
533 * Also modified interceptor behaviour:
534 * - We now intercept all URLs beginning with one of the following
535 * prefixes (and *only* these prefixes):
537 * * http://ijbswa.sf.net/config/
538 * * http://ijbswa.sourceforge.net/config/
539 * - New interceptors "home page" - go to http://i.j.b/ to see it.
540 * - Internal changes so that intercepted and fast redirect pages
541 * are not replaced with an image.
542 * - Interceptors now have the option to send a binary page direct
543 * to the client. (i.e. ijb-send-banner uses this)
544 * - Implemented show-url-info interceptor. (Which is why I needed
545 * the above interceptors changes - a typical URL is
546 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
547 * The previous mechanism would not have intercepted that, and
548 * if it had been intercepted then it then it would have replaced
551 * Revision 1.9 2001/05/27 22:17:04 oes
553 * - re_process_buffer no longer writes the modified buffer
554 * to the client, which was very ugly. It now returns the
555 * buffer, which it is then written by chat.
557 * - content_length now adjusts the Content-Length: header
558 * for modified documents rather than crunch()ing it.
559 * (Length info in csp->content_length, which is 0 for
560 * unmodified documents)
562 * - For this to work, sed() is called twice when filtering.
564 * Revision 1.8 2001/05/26 17:13:28 jongfoster
565 * Filled in a function comment.
567 * Revision 1.7 2001/05/26 15:26:15 jongfoster
568 * ACL feature now provides more security by immediately dropping
569 * connections from untrusted hosts.
571 * Revision 1.6 2001/05/26 00:28:36 jongfoster
572 * Automatic reloading of config file.
573 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
574 * Most of the global variables have been moved to a new
575 * struct configuration_spec, accessed through csp->config->globalname
576 * Most of the globals remaining are used by the Win32 GUI.
578 * Revision 1.5 2001/05/25 22:34:30 jongfoster
581 * Revision 1.4 2001/05/22 18:46:04 oes
583 * - Enabled filtering banners by size rather than URL
584 * by adding patterns that replace all standard banner
585 * sizes with the "Junkbuster" gif to the re_filterfile
587 * - Enabled filtering WebBugs by providing a pattern
588 * which kills all 1x1 images
590 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
591 * which is selected by the (nonstandard and therefore
592 * capital) letter 'U' in the option string.
593 * It causes the quantifiers to be ungreedy by default.
594 * Appending a ? turns back to greedy (!).
596 * - Added a new interceptor ijb-send-banner, which
597 * sends back the "Junkbuster" gif. Without imagelist or
598 * MSIE detection support, or if tinygif = 1, or the
599 * URL isn't recognized as an imageurl, a lame HTML
600 * explanation is sent instead.
602 * - Added new feature, which permits blocking remote
603 * script redirects and firing back a local redirect
605 * The feature is conditionally compiled, i.e. it
606 * can be disabled with --disable-fast-redirects,
607 * plus it must be activated by a "fast-redirects"
608 * line in the config file, has its own log level
609 * and of course wants to be displayed by show-proxy-args
610 * Note: Boy, all the #ifdefs in 1001 locations and
611 * all the fumbling with configure.in and acconfig.h
612 * were *way* more work than the feature itself :-(
614 * - Because a generic redirect template was needed for
615 * this, tinygif = 3 now uses the same.
617 * - Moved GIFs, and other static HTTP response templates
622 * - Removed some >400 CRs again (Jon, you really worked
625 * Revision 1.3 2001/05/20 16:44:47 jongfoster
626 * Removing last hardcoded Junkbusters.com URLs.
628 * Revision 1.2 2001/05/20 01:21:20 jongfoster
629 * Version 2.9.4 checkin.
630 * - Merged popupfile and cookiefile, and added control over PCRS
631 * filtering, in new "permissionsfile".
632 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
633 * file error you now get a message box (in the Win32 GUI) rather
634 * than the program exiting with no explanation.
635 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
637 * - Removed tabs from "config"
638 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
639 * - Bumped up version number.
641 * Revision 1.1.1.1 2001/05/15 13:58:52 oes
642 * Initial import of version 2.9.3 source tree
645 *********************************************************************/
651 #include <sys/types.h>
660 #endif /* ndef __OS2__ */
661 #include <netinet/in.h>
663 #include <winsock2.h>
664 #endif /* ndef _WIN32 */
668 #endif /* def __OS2__ */
676 #include "jbsockets.h"
677 #include "miscutil.h"
681 #include "deanimate.h"
682 #include "urlmatch.h"
689 const char filters_h_rcs[] = FILTERS_H_VERSION;
691 /* Fix a problem with Solaris. There should be no effect on other
693 * Solaris's isspace() is a macro which uses it's argument directly
694 * as an array index. Therefore we need to make sure that high-bit
695 * characters generate +ve values, and ideally we also want to make
696 * the argument match the declared parameter type of "int".
698 #define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
700 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
701 static jb_err prepare_for_filtering(struct client_state *csp);
704 /*********************************************************************
706 * Function : block_acl
708 * Description : Block this request?
709 * Decide yes or no based on ACL file.
712 * 1 : dst = The proxy or gateway address this is going to.
713 * Or NULL to check all possible targets.
714 * 2 : csp = Current client state (buffers, headers, etc...)
715 * Also includes the client IP address.
717 * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
719 *********************************************************************/
720 int block_acl(const struct access_control_addr *dst, const struct client_state *csp)
722 struct access_control_list *acl = csp->config->acl;
724 /* if not using an access control list, then permit the connection */
730 /* search the list */
733 if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
737 /* Just want to check if they have any access */
738 if (acl->action == ACL_PERMIT)
743 else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
744 && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
746 if (acl->action == ACL_PERMIT)
764 /*********************************************************************
766 * Function : acl_addr
768 * Description : Called from `load_config' to parse an ACL address.
771 * 1 : aspec = String specifying ACL address.
772 * 2 : aca = struct access_control_addr to fill in.
774 * Returns : 0 => Ok, everything else is an error.
776 *********************************************************************/
777 int acl_addr(const char *aspec, struct access_control_addr *aca)
782 char *acl_spec = NULL;
788 * Use a temporary acl spec copy so we can log
789 * the unmodified original in case of parse errors.
791 acl_spec = strdup(aspec);
792 if (acl_spec == NULL)
794 /* XXX: This will be logged as parse error. */
798 if ((p = strchr(acl_spec, '/')) != NULL)
801 if (ijb_isdigit(*p) == 0)
806 masklength = atoi(p);
809 if ((masklength < 0) || (masklength > 32))
815 if ((p = strchr(acl_spec, ':')) != NULL)
820 port = strtol(p, &endptr, 10);
822 if (port <= 0 || port > 65535 || *endptr != '\0')
829 aca->port = (unsigned long)port;
831 aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
834 if (aca->addr == INADDR_NONE)
836 /* XXX: This will be logged as parse error. */
840 /* build the netmask */
842 for (i=1; i <= masklength ; i++)
844 aca->mask |= (1U << (32 - i));
847 /* now mask off the host portion of the ip address
848 * (i.e. save on the network portion of the address).
850 aca->addr = aca->addr & aca->mask;
855 #endif /* def FEATURE_ACL */
858 /*********************************************************************
860 * Function : connect_port_is_forbidden
862 * Description : Check to see if CONNECT requests to the destination
863 * port of this request are forbidden. The check is
864 * independend of the actual request method.
867 * 1 : csp = Current client state (buffers, headers, etc...)
869 * Returns : True if yes, false otherwise.
871 *********************************************************************/
872 int connect_port_is_forbidden(const struct client_state *csp)
874 return ((csp->action->flags & ACTION_LIMIT_CONNECT) &&
875 !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT],
880 /*********************************************************************
882 * Function : block_url
884 * Description : Called from `chat'. Check to see if we need to block this.
887 * 1 : csp = Current client state (buffers, headers, etc...)
889 * Returns : NULL => unblocked, else HTTP block response
891 *********************************************************************/
892 struct http_response *block_url(struct client_state *csp)
894 struct http_response *rsp;
895 const char *new_content_type = NULL;
898 * If it's not blocked, don't block it ;-)
900 if ((csp->action->flags & ACTION_BLOCK) == 0)
904 if (csp->action->flags & ACTION_REDIRECT)
906 log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
909 * Else, prepare a response
911 if (NULL == (rsp = alloc_http_response()))
913 return cgi_error_memory();
917 * If it's an image-url, send back an image or redirect
918 * as specified by the relevant +image action
920 #ifdef FEATURE_IMAGE_BLOCKING
921 if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
925 /* determine HOW images should be blocked */
926 p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
928 if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
930 log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
932 #if 1 /* Two alternative strategies, use this one for now: */
934 /* and handle accordingly: */
935 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
937 rsp->status = strdup("403 Request blocked by Privoxy");
938 if (rsp->status == NULL)
940 free_http_response(rsp);
941 return cgi_error_memory();
943 rsp->body = bindup(image_pattern_data, image_pattern_length);
944 if (rsp->body == NULL)
946 free_http_response(rsp);
947 return cgi_error_memory();
949 rsp->content_length = image_pattern_length;
951 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
953 free_http_response(rsp);
954 return cgi_error_memory();
958 else if (0 == strcmpic(p, "blank"))
960 rsp->status = strdup("403 Request blocked by Privoxy");
961 if (rsp->status == NULL)
963 free_http_response(rsp);
964 return cgi_error_memory();
966 rsp->body = bindup(image_blank_data, image_blank_length);
967 if (rsp->body == NULL)
969 free_http_response(rsp);
970 return cgi_error_memory();
972 rsp->content_length = image_blank_length;
974 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
976 free_http_response(rsp);
977 return cgi_error_memory();
983 rsp->status = strdup("302 Local Redirect from Privoxy");
984 if (rsp->status == NULL)
986 free_http_response(rsp);
987 return cgi_error_memory();
990 if (enlist_unique_header(rsp->headers, "Location", p))
992 free_http_response(rsp);
993 return cgi_error_memory();
997 #else /* Following code is disabled for now */
999 /* and handle accordingly: */
1000 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
1002 p = CGI_PREFIX "send-banner?type=pattern";
1004 else if (0 == strcmpic(p, "blank"))
1006 p = CGI_PREFIX "send-banner?type=blank";
1008 rsp->status = strdup("302 Local Redirect from Privoxy");
1009 if (rsp->status == NULL)
1011 free_http_response(rsp);
1012 return cgi_error_memory();
1015 if (enlist_unique_header(rsp->headers, "Location", p))
1017 free_http_response(rsp);
1018 return cgi_error_memory();
1020 #endif /* Preceeding code is disabled for now */
1022 else if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
1025 * Send empty document.
1027 new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
1030 rsp->body = strdup(" ");
1031 rsp->content_length = 1;
1033 rsp->status = strdup("403 Request blocked by Privoxy");
1034 if (rsp->status == NULL)
1036 free_http_response(rsp);
1037 return cgi_error_memory();
1039 if (new_content_type != 0)
1041 log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
1042 if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
1044 free_http_response(rsp);
1045 return cgi_error_memory();
1050 #endif /* def FEATURE_IMAGE_BLOCKING */
1053 * Else, generate an HTML "blocked" message:
1057 struct map * exports;
1061 * Workaround for stupid Netscape bug which prevents
1062 * pages from being displayed if loading a referenced
1063 * JavaScript or style sheet fails. So make it appear
1064 * as if it succeeded.
1066 if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
1067 && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
1068 && !strstr(p, "Gecko") /* save Mozilla, */
1069 && !strstr(p, "compatible") /* MSIE */
1070 && !strstr(p, "Opera")) /* and Opera. */
1072 rsp->status = strdup("200 Request for blocked URL");
1076 rsp->status = strdup("403 Request for blocked URL");
1079 if (rsp->status == NULL)
1081 free_http_response(rsp);
1082 return cgi_error_memory();
1085 exports = default_exports(csp, NULL);
1086 if (exports == NULL)
1088 free_http_response(rsp);
1089 return cgi_error_memory();
1092 #ifdef FEATURE_FORCE_LOAD
1093 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1095 * Export the force conditional block killer if
1097 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1098 * - Privoxy is configured to enforce blocks, or
1099 * - it's a CONNECT request and enforcing wouldn't work anyway.
1101 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1102 || (0 == strcmpic(csp->http->gpc, "connect")))
1103 #endif /* ndef FEATURE_FORCE_LOAD */
1105 err = map_block_killer(exports, "force-support");
1108 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1109 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
1110 if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
1111 if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
1114 const char *block_reason;
1115 if (csp->action->string[ACTION_STRING_BLOCK] != NULL)
1117 block_reason = csp->action->string[ACTION_STRING_BLOCK];
1121 assert(connect_port_is_forbidden(csp));
1122 block_reason = "Forbidden CONNECT port.";
1124 err = map(exports, "block-reason", 1, html_encode(block_reason), 0);
1129 free_http_response(rsp);
1130 return cgi_error_memory();
1133 err = template_fill_for_cgi(csp, "blocked", exports, rsp);
1136 free_http_response(rsp);
1137 return cgi_error_memory();
1140 rsp->reason = RSP_REASON_BLOCKED;
1142 return finish_http_response(csp, rsp);
1147 #ifdef FEATURE_TRUST
1148 /*********************************************************************
1150 * Function : trust_url FIXME: I should be called distrust_url
1152 * Description : Calls is_untrusted_url to determine if the URL is trusted
1153 * and if not, returns a HTTP 403 response with a reject message.
1156 * 1 : csp = Current client state (buffers, headers, etc...)
1158 * Returns : NULL => trusted, else http_response.
1160 *********************************************************************/
1161 struct http_response *trust_url(struct client_state *csp)
1163 struct http_response *rsp;
1164 struct map * exports;
1165 char buf[BUFFER_SIZE];
1167 struct url_spec **tl;
1172 * Don't bother to work on trusted URLs
1174 if (!is_untrusted_url(csp))
1180 * Else, prepare a response:
1182 if (NULL == (rsp = alloc_http_response()))
1184 return cgi_error_memory();
1187 rsp->status = strdup("403 Request blocked by Privoxy");
1188 exports = default_exports(csp, NULL);
1189 if (exports == NULL || rsp->status == NULL)
1191 free_http_response(rsp);
1192 return cgi_error_memory();
1196 * Export the protocol, host, port, and referrer information
1198 err = map(exports, "hostport", 1, csp->http->hostport, 1);
1199 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1200 if (!err) err = map(exports, "path", 1, csp->http->path, 1);
1202 if (NULL != (p = get_header_value(csp->headers, "Referer:")))
1204 if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
1208 if (!err) err = map(exports, "referrer", 1, "none set", 1);
1214 free_http_response(rsp);
1215 return cgi_error_memory();
1219 * Export the trust list
1222 for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
1224 snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
1225 string_append(&p, buf);
1227 err = map(exports, "trusted-referrers", 1, p, 0);
1232 free_http_response(rsp);
1233 return cgi_error_memory();
1237 * Export the trust info, if available
1239 if (csp->config->trust_info->first)
1241 struct list_entry *l;
1244 for (l = csp->config->trust_info->first; l ; l = l->next)
1246 snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
1247 string_append(&p, buf);
1249 err = map(exports, "trust-info", 1, p, 0);
1253 err = map_block_killer(exports, "have-trust-info");
1259 free_http_response(rsp);
1260 return cgi_error_memory();
1264 * Export the force conditional block killer if
1266 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1267 * - Privoxy is configured to enforce blocks, or
1268 * - it's a CONNECT request and enforcing wouldn't work anyway.
1270 #ifdef FEATURE_FORCE_LOAD
1271 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1272 || (0 == strcmpic(csp->http->gpc, "connect")))
1274 err = map_block_killer(exports, "force-support");
1278 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1280 #else /* ifndef FEATURE_FORCE_LOAD */
1281 err = map_block_killer(exports, "force-support");
1282 #endif /* ndef FEATURE_FORCE_LOAD */
1287 free_http_response(rsp);
1288 return cgi_error_memory();
1292 * Build the response
1294 err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
1297 free_http_response(rsp);
1298 return cgi_error_memory();
1300 rsp->reason = RSP_REASON_UNTRUSTED;
1302 return finish_http_response(csp, rsp);
1304 #endif /* def FEATURE_TRUST */
1307 /*********************************************************************
1309 * Function : compile_dynamic_pcrs_job_list
1311 * Description : Compiles a dynamic pcrs job list (one with variables
1312 * resolved at request time)
1315 * 1 : csp = Current client state (buffers, headers, etc...)
1316 * 2 : b = The filter list to compile
1318 * Returns : NULL in case of errors, otherwise the
1321 *********************************************************************/
1322 pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
1324 struct list_entry *pattern;
1325 pcrs_job *job_list = NULL;
1326 pcrs_job *dummy = NULL;
1327 pcrs_job *lastjob = NULL;
1330 const struct pcrs_variable variables[] =
1332 {"url", csp->http->url, 1},
1333 {"path", csp->http->path, 1},
1334 {"host", csp->http->host, 1},
1335 {"origin", csp->ip_addr_str, 1},
1339 for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
1341 assert(pattern->str != NULL);
1343 dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
1347 log_error(LOG_LEVEL_ERROR,
1348 "Adding filter job \'%s\' to dynamic filter %s failed: %s",
1349 pattern->str, b->name, pcrs_strerror(error));
1354 if (error == PCRS_WARN_TRUNCATION)
1356 log_error(LOG_LEVEL_ERROR,
1357 "At least one of the variables in \'%s\' had to "
1358 "be truncated before compilation", pattern->str);
1360 if (job_list == NULL)
1366 lastjob->next = dummy;
1376 /*********************************************************************
1378 * Function : rewrite_url
1380 * Description : Rewrites a URL with a single pcrs command
1381 * and returns the result if it differs from the
1382 * original and isn't obviously invalid.
1385 * 1 : old_url = URL to rewrite.
1386 * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
1389 * Returns : NULL if the pcrs_command didn't change the url, or
1390 * the result of the modification.
1392 *********************************************************************/
1393 char *rewrite_url(char *old_url, const char *pcrs_command)
1395 char *new_url = NULL;
1399 assert(pcrs_command);
1401 new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
1405 log_error(LOG_LEVEL_REDIRECTS,
1406 "pcrs command \"%s\" didn't change \"%s\".",
1407 pcrs_command, old_url);
1412 log_error(LOG_LEVEL_REDIRECTS,
1413 "executing pcrs command \"%s\" to rewrite %s failed: %s",
1414 pcrs_command, old_url, pcrs_strerror(hits));
1417 else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
1419 log_error(LOG_LEVEL_ERROR,
1420 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
1421 "but the result doesn't look like a valid URL and will be ignored.",
1422 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1427 log_error(LOG_LEVEL_REDIRECTS,
1428 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
1429 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1437 #ifdef FEATURE_FAST_REDIRECTS
1438 /*********************************************************************
1440 * Function : get_last_url
1442 * Description : Search for the last URL inside a string.
1443 * If the string already is a URL, it will
1444 * be the first URL found.
1447 * 1 : subject = the string to check
1448 * 2 : redirect_mode = +fast-redirect{} mode
1450 * Returns : NULL if no URL was found, or
1451 * the last URL found.
1453 *********************************************************************/
1454 char *get_last_url(char *subject, const char *redirect_mode)
1456 char *new_url = NULL;
1460 assert(redirect_mode);
1462 subject = strdup(subject);
1463 if (subject == NULL)
1465 log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
1469 if (0 == strcmpic(redirect_mode, "check-decoded-url"))
1471 log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
1472 new_url = url_decode(subject);
1473 if (new_url != NULL)
1480 log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
1484 log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
1487 * Find the last URL encoded in the request
1490 while ((tmp = strstr(tmp, "http://")) != NULL)
1494 tmp = (new_url != NULL) ? new_url : subject;
1495 while ((tmp = strstr(tmp, "https://")) != NULL)
1500 if ((new_url != NULL)
1501 && ( (new_url != subject)
1502 || (0 == strncmpic(subject, "http://", 7))
1503 || (0 == strncmpic(subject, "https://", 8))
1507 * Return new URL if we found a redirect
1508 * or if the subject already was a URL.
1510 * The second case makes sure that we can
1511 * chain get_last_url after another redirection check
1512 * (like rewrite_url) without losing earlier redirects.
1514 new_url = strdup(new_url);
1523 #endif /* def FEATURE_FAST_REDIRECTS */
1526 /*********************************************************************
1528 * Function : redirect_url
1530 * Description : Checks if Privoxy should answer the request with
1531 * a HTTP redirect and generates the redirect if
1535 * 1 : csp = Current client state (buffers, headers, etc...)
1537 * Returns : NULL if the request can pass, HTTP redirect otherwise.
1539 *********************************************************************/
1540 struct http_response *redirect_url(struct client_state *csp)
1542 struct http_response *rsp;
1543 #ifdef FEATURE_FAST_REDIRECTS
1545 * XXX: Do we still need FEATURE_FAST_REDIRECTS
1546 * as compile-time option? The user can easily disable
1547 * it in his action file.
1549 char * redirect_mode;
1550 #endif /* def FEATURE_FAST_REDIRECTS */
1551 char *old_url = NULL;
1552 char *new_url = NULL;
1553 char *redirection_string;
1555 if ((csp->action->flags & ACTION_REDIRECT))
1557 redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
1560 * If the redirection string begins with 's',
1561 * assume it's a pcrs command, otherwise treat it as
1562 * properly formatted URL and use it for the redirection
1565 * According to RFC 2616 section 14.30 the URL
1566 * has to be absolute and if the user tries:
1567 * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
1568 * she would get undefined results anyway.
1572 if (*redirection_string == 's')
1574 old_url = csp->http->url;
1575 new_url = rewrite_url(old_url, redirection_string);
1579 log_error(LOG_LEVEL_REDIRECTS,
1580 "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
1581 redirection_string);
1582 new_url = strdup(redirection_string);
1586 #ifdef FEATURE_FAST_REDIRECTS
1587 if ((csp->action->flags & ACTION_FAST_REDIRECTS))
1589 redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
1592 * If it exists, use the previously rewritten URL as input
1593 * otherwise just use the old path.
1595 old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
1596 new_url = get_last_url(old_url, redirect_mode);
1601 * Disable redirect checkers, so that they
1602 * will be only run more than once if the user
1603 * also enables them through tags.
1605 * From a performance point of view
1606 * it doesn't matter, but the duplicated
1607 * log messages are annoying.
1609 csp->action->flags &= ~ACTION_FAST_REDIRECTS;
1610 #endif /* def FEATURE_FAST_REDIRECTS */
1611 csp->action->flags &= ~ACTION_REDIRECT;
1613 /* Did any redirect action trigger? */
1616 if (0 == strcmpic(new_url, csp->http->url))
1618 log_error(LOG_LEVEL_ERROR,
1619 "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
1620 csp->http->url, new_url);
1625 log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
1627 if (NULL == (rsp = alloc_http_response()))
1630 return cgi_error_memory();
1633 if ( enlist_unique_header(rsp->headers, "Location", new_url)
1634 || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
1637 free_http_response(rsp);
1638 return cgi_error_memory();
1640 rsp->reason = RSP_REASON_REDIRECTED;
1643 return finish_http_response(csp, rsp);
1647 /* Only reached if no redirect is required */
1653 #ifdef FEATURE_IMAGE_BLOCKING
1654 /*********************************************************************
1656 * Function : is_imageurl
1658 * Description : Given a URL, decide whether it is an image or not,
1659 * using either the info from a previous +image action
1660 * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
1661 * is MSIE and not on a Mac, tell from the browser's accept
1665 * 1 : csp = Current client state (buffers, headers, etc...)
1667 * Returns : True (nonzero) if URL is an image, false (0)
1670 *********************************************************************/
1671 int is_imageurl(const struct client_state *csp)
1673 #ifdef FEATURE_IMAGE_DETECT_MSIE
1676 tmp = get_header_value(csp->headers, "User-Agent:");
1677 if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
1679 tmp = get_header_value(csp->headers, "Accept:");
1680 if (tmp && strstr(tmp, "image/gif"))
1682 /* Client will accept HTML. If this seems counterintuitive,
1692 #endif /* def FEATURE_IMAGE_DETECT_MSIE */
1694 return ((csp->action->flags & ACTION_IMAGE) != 0);
1697 #endif /* def FEATURE_IMAGE_BLOCKING */
1700 #ifdef FEATURE_TRUST
1701 /*********************************************************************
1703 * Function : is_untrusted_url
1705 * Description : Should we "distrust" this URL (and block it)?
1707 * Yes if it matches a line in the trustfile, or if the
1708 * referrer matches a line starting with "+" in the
1713 * 1 : csp = Current client state (buffers, headers, etc...)
1715 * Returns : 0 => trusted, 1 => untrusted
1717 *********************************************************************/
1718 int is_untrusted_url(const struct client_state *csp)
1720 struct file_list *fl;
1721 struct block_spec *b;
1722 struct url_spec **trusted_url;
1723 struct http_request rhttp[1];
1724 const char * referer;
1728 * If we don't have a trustlist, we trust everybody
1730 if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
1735 memset(rhttp, '\0', sizeof(*rhttp));
1738 * Do we trust the request URL itself?
1740 for (b = b->next; b ; b = b->next)
1742 if (url_match(b->url, csp->http))
1748 if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
1750 /* no referrer was supplied */
1756 * If not, do we maybe trust its referrer?
1758 err = parse_http_url(referer, rhttp, REQUIRE_PROTOCOL);
1764 for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
1766 if (url_match(*trusted_url, rhttp))
1768 /* if the URL's referrer is from a trusted referrer, then
1769 * add the target spec to the trustfile as an unblocked
1770 * domain and return 0 (which means it's OK).
1775 if (NULL != (fp = fopen(csp->config->trustfile, "a")))
1779 char * new_entry = strdup("~");
1781 string_append(&new_entry, csp->http->hostport);
1783 path = csp->http->path;
1784 if ( (path[0] == '/')
1786 && ((path_end = strchr(path + 2, '/')) != NULL))
1788 /* since this path points into a user's home space
1789 * be sure to include this spec in the trustfile.
1791 int path_len = path_end - path; /* save offset */
1792 path = strdup(path); /* Copy string */
1795 path_end = path + path_len; /* regenerate ptr to new buffer */
1796 *(path_end + 1) = '\0'; /* Truncate path after '/' */
1798 string_join(&new_entry, path);
1802 * Give a reason for generating this entry.
1804 string_append(&new_entry, " # Trusted referrer was: ");
1805 string_append(&new_entry, referer);
1807 if (new_entry != NULL)
1809 if (-1 == fprintf(fp, "%s\n", new_entry))
1811 log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
1812 new_entry, csp->config->trustfile);
1818 /* FIXME: No way to handle out-of memory, so mostly ignoring it */
1819 log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
1826 log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
1827 csp->http->hostport, csp->config->trustfile);
1835 #endif /* def FEATURE_TRUST */
1838 /*********************************************************************
1840 * Function : pcrs_filter_response
1842 * Description : Execute all text substitutions from all applying
1843 * +filter actions on the text buffer that's been
1844 * accumulated in csp->iob->buf.
1847 * 1 : csp = Current client state (buffers, headers, etc...)
1849 * Returns : a pointer to the (newly allocated) modified buffer.
1850 * or NULL if there were no hits or something went wrong
1852 *********************************************************************/
1853 static char *pcrs_filter_response(struct client_state *csp)
1856 size_t size, prev_size;
1862 struct file_list *fl;
1863 struct re_filterfile_spec *b;
1864 struct list_entry *filtername;
1866 int i, found_filters = 0;
1871 if (csp->iob->cur >= csp->iob->eod)
1877 * Need to check the set of re_filterfiles...
1879 for (i = 0; i < MAX_AF_FILES; i++)
1892 if (0 == found_filters)
1894 log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
1895 "content filtering enabled, but no content filters available.");
1899 size = (size_t)(csp->iob->eod - csp->iob->cur);
1900 old = csp->iob->cur;
1902 for (i = 0; i < MAX_AF_FILES; i++)
1905 if ((NULL == fl) || (NULL == fl->f))
1908 * Either there are no filter files
1909 * left, or this filter file just
1910 * contains no valid filters.
1912 * Continue to be sure we don't miss
1913 * valid filter files that are chained
1914 * after empty or invalid ones.
1919 * For all applying +filter actions, look if a filter by that
1920 * name exists and if yes, execute it's pcrs_joblist on the
1923 for (b = fl->f; b; b = b->next)
1925 if (b->type != FT_CONTENT_FILTER)
1927 /* Skip header filters */
1931 for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
1932 filtername ; filtername = filtername->next)
1934 if (strcmp(b->name, filtername->str) == 0)
1936 int current_hits = 0; /* Number of hits caused by this filter */
1937 int job_number = 0; /* Which job we're currently executing */
1938 int job_hits = 0; /* How many hits the current job caused */
1939 pcrs_job *joblist = b->joblist;
1941 if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
1943 if (NULL == joblist)
1945 log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
1950 /* Apply all jobs from the joblist */
1951 for (job = joblist; NULL != job; job = job->next)
1954 job_hits = pcrs_execute(job, old, size, &new, &size);
1959 * That went well. Continue filtering
1960 * and use the result of this job as
1961 * input for the next one.
1963 current_hits += job_hits;
1964 if (old != csp->iob->cur)
1973 * This job caused an unexpected error. Inform the user
1974 * and skip the rest of the jobs in this filter. We could
1975 * continue with the next job, but usually the jobs
1976 * depend on each other or are similar enough to
1977 * fail for the same reason.
1979 * At the moment our pcrs expects the error codes of pcre 3.4,
1980 * but newer pcre versions can return additional error codes.
1981 * As a result pcrs_strerror()'s error message might be
1982 * "Unknown error ...", therefore we print the numerical value
1985 * XXX: Is this important enough for LOG_LEVEL_ERROR or
1986 * should we use LOG_LEVEL_RE_FILTER instead?
1988 log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
1989 b->name, job_number, pcrs_strerror(job_hits), job_hits);
1994 if (b->dynamic) pcrs_free_joblist(joblist);
1996 log_error(LOG_LEVEL_RE_FILTER,
1997 "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
1998 csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
2000 hits += current_hits;
2007 * If there were no hits, destroy our copy and let
2008 * chat() use the original in csp->iob
2016 csp->flags |= CSP_FLAG_MODIFIED;
2017 csp->content_length = size;
2025 /*********************************************************************
2027 * Function : gif_deanimate_response
2029 * Description : Deanimate the GIF image that has been accumulated in
2030 * csp->iob->buf, set csp->content_length to the modified
2031 * size and raise the CSP_FLAG_MODIFIED flag.
2034 * 1 : csp = Current client state (buffers, headers, etc...)
2036 * Returns : a pointer to the (newly allocated) modified buffer.
2037 * or NULL in case something went wrong.
2039 *********************************************************************/
2040 static char *gif_deanimate_response(struct client_state *csp)
2042 struct binbuffer *in, *out;
2046 size = (size_t)(csp->iob->eod - csp->iob->cur);
2048 if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
2049 || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
2051 log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
2055 in->buffer = csp->iob->cur;
2058 if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
2060 log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
2067 if ((int)size == out->offset)
2069 log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
2073 log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
2075 csp->content_length = out->offset;
2076 csp->flags |= CSP_FLAG_MODIFIED;
2086 /*********************************************************************
2088 * Function : get_filter_function
2090 * Description : Decides which content filter function has
2091 * to be applied (if any).
2094 * 1 : csp = Current client state (buffers, headers, etc...)
2096 * Returns : The content filter function to run, or
2097 * NULL if no content filter is active
2099 *********************************************************************/
2100 filter_function_ptr get_filter_function(struct client_state *csp)
2102 filter_function_ptr filter_function = NULL;
2105 * Are we enabling text mode by force?
2107 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
2110 * Do we really have to?
2112 if (csp->content_type & CT_TEXT)
2114 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
2118 csp->content_type |= CT_TEXT;
2119 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
2123 if (!(csp->content_type & CT_DECLARED))
2126 * The server didn't bother to declare a MIME-Type.
2127 * Assume it's text that can be filtered.
2129 * This also regulary happens with 304 responses,
2130 * therefore logging anything here would cause
2133 csp->content_type |= CT_TEXT;
2137 * Choose the applying filter function based on
2138 * the content type and action settings.
2140 if ((csp->content_type & CT_TEXT) &&
2141 (csp->rlist != NULL) &&
2142 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
2144 filter_function = pcrs_filter_response;
2146 else if ((csp->content_type & CT_GIF) &&
2147 (csp->action->flags & ACTION_DEANIMATE))
2149 filter_function = gif_deanimate_response;
2152 return filter_function;
2156 /*********************************************************************
2158 * Function : remove_chunked_transfer_coding
2160 * Description : In-situ remove the "chunked" transfer coding as defined
2161 * in rfc2616 from a buffer.
2164 * 1 : buffer = Pointer to the text buffer
2165 * 2 : size = In: Number of bytes to be processed,
2166 * Out: Number of bytes after de-chunking.
2167 * (undefined in case of errors)
2169 * Returns : JB_ERR_OK for success,
2170 * JB_ERR_PARSE otherwise
2172 *********************************************************************/
2173 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
2176 unsigned int chunksize = 0;
2177 char *from_p, *to_p;
2180 from_p = to_p = buffer;
2182 if (sscanf(buffer, "%x", &chunksize) != 1)
2184 log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
2185 return JB_ERR_PARSE;
2188 while (chunksize > 0U)
2190 if (NULL == (from_p = strstr(from_p, "\r\n")))
2192 log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
2193 return JB_ERR_PARSE;
2196 if ((newsize += chunksize) >= *size)
2198 log_error(LOG_LEVEL_ERROR,
2199 "Chunk size %d exceeds buffer size %d in \"chunked\" transfer coding",
2201 return JB_ERR_PARSE;
2205 memmove(to_p, from_p, (size_t) chunksize);
2206 to_p = buffer + newsize;
2207 from_p += chunksize + 2;
2209 if (sscanf(from_p, "%x", &chunksize) != 1)
2211 log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
2216 /* XXX: Should get its own loglevel. */
2217 log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
2226 /*********************************************************************
2228 * Function : prepare_for_filtering
2230 * Description : If necessary, de-chunks and decompresses
2231 * the content so it can get filterd.
2234 * 1 : csp = Current client state (buffers, headers, etc...)
2236 * Returns : JB_ERR_OK for success,
2237 * JB_ERR_PARSE otherwise
2239 *********************************************************************/
2240 static jb_err prepare_for_filtering(struct client_state *csp)
2242 jb_err err = JB_ERR_OK;
2245 * If the body has a "chunked" transfer-encoding,
2246 * get rid of it, adjusting size and iob->eod
2248 if (csp->flags & CSP_FLAG_CHUNKED)
2250 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
2252 log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
2253 err = remove_chunked_transfer_coding(csp->iob->cur, &size);
2254 if (JB_ERR_OK == err)
2256 csp->iob->eod = csp->iob->cur + size;
2257 csp->flags |= CSP_FLAG_MODIFIED;
2261 return JB_ERR_PARSE;
2267 * If the body has a supported transfer-encoding,
2268 * decompress it, adjusting size and iob->eod.
2270 if (csp->content_type & (CT_GZIP|CT_DEFLATE))
2272 if (0 == csp->iob->eod - csp->iob->cur)
2274 /* Nothing left after de-chunking. */
2278 err = decompress_iob(csp);
2280 if (JB_ERR_OK == err)
2282 csp->flags |= CSP_FLAG_MODIFIED;
2283 csp->content_type &= ~CT_TABOO;
2288 * Unset CT_GZIP and CT_DEFLATE to remember not
2289 * to modify the Content-Encoding header later.
2291 csp->content_type &= ~CT_GZIP;
2292 csp->content_type &= ~CT_DEFLATE;
2301 /*********************************************************************
2303 * Function : execute_content_filter
2305 * Description : Executes a given content filter.
2308 * 1 : csp = Current client state (buffers, headers, etc...)
2309 * 2 : content_filter = The filter function to execute
2311 * Returns : Pointer to the modified buffer, or
2312 * NULL if filtering failed or wasn't necessary.
2314 *********************************************************************/
2315 char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
2317 if (0 == csp->iob->eod - csp->iob->cur)
2320 * No content (probably status code 301, 302 ...),
2321 * no filtering necessary.
2326 if (JB_ERR_OK != prepare_for_filtering(csp))
2329 * failed to de-chunk or decompress.
2334 if (0 == csp->iob->eod - csp->iob->cur)
2337 * Clown alarm: chunked and/or compressed nothing delivered.
2342 return ((*content_filter)(csp));
2346 /*********************************************************************
2348 * Function : get_url_actions
2350 * Description : Gets the actions for this URL.
2353 * 1 : csp = Current client state (buffers, headers, etc...)
2354 * 2 : http = http_request request for blocked URLs
2358 *********************************************************************/
2359 void get_url_actions(struct client_state *csp, struct http_request *http)
2361 struct file_list *fl;
2362 struct url_actions *b;
2365 init_current_action(csp->action);
2367 for (i = 0; i < MAX_AF_FILES; i++)
2369 if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
2374 apply_url_actions(csp->action, http, b);
2381 /*********************************************************************
2383 * Function : apply_url_actions
2385 * Description : Applies a list of URL actions.
2388 * 1 : action = Destination.
2389 * 2 : http = Current URL
2390 * 3 : b = list of URL actions to apply
2394 *********************************************************************/
2395 void apply_url_actions(struct current_action_spec *action,
2396 struct http_request *http,
2397 struct url_actions *b)
2401 /* Should never happen */
2405 for (b = b->next; NULL != b; b = b->next)
2407 if (url_match(b->url, http))
2409 merge_current_action(action, b->action);
2415 /*********************************************************************
2417 * Function : get_forward_override_settings
2419 * Description : Returns forward settings as specified with the
2420 * forward-override{} action. forward-override accepts
2421 * forward lines similar to the one used in the
2422 * configuration file, but without the URL pattern.
2428 * in the configuration file can be replaced with
2429 * the action section:
2431 * {+forward-override{forward .}}
2435 * 1 : csp = Current client state (buffers, headers, etc...)
2437 * Returns : Pointer to forwarding structure in case of success.
2438 * Invalid syntax is fatal.
2440 *********************************************************************/
2441 const static struct forward_spec *get_forward_override_settings(struct client_state *csp)
2443 const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
2444 char forward_settings[BUFFER_SIZE];
2445 char *http_parent = NULL;
2446 /* variable names were chosen for consistency reasons. */
2447 struct forward_spec *fwd = NULL;
2451 assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
2452 /* Should be enforced by load_one_actions_file() */
2453 assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
2455 /* Create a copy ssplit can modify */
2456 strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
2458 if (NULL != csp->fwd)
2461 * XXX: Currently necessary to prevent memory
2462 * leaks when the show-url-info cgi page is visited.
2464 unload_forward_spec(csp->fwd);
2468 * allocate a new forward node, valid only for
2469 * the lifetime of this request. Save its location
2470 * in csp as well, so sweep() can free it later on.
2472 fwd = csp->fwd = zalloc(sizeof(*fwd));
2475 log_error(LOG_LEVEL_FATAL,
2476 "can't allocate memory for forward-override{%s}", forward_override_line);
2477 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2480 vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
2481 if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
2483 fwd->type = SOCKS_NONE;
2485 /* Parse the parent HTTP proxy host:port */
2486 http_parent = vec[1];
2489 else if (vec_count == 3)
2491 char *socks_proxy = NULL;
2493 if (!strcasecmp(vec[0], "forward-socks4"))
2495 fwd->type = SOCKS_4;
2496 socks_proxy = vec[1];
2498 else if (!strcasecmp(vec[0], "forward-socks4a"))
2500 fwd->type = SOCKS_4A;
2501 socks_proxy = vec[1];
2503 else if (!strcasecmp(vec[0], "forward-socks5"))
2505 fwd->type = SOCKS_5;
2506 socks_proxy = vec[1];
2509 if (NULL != socks_proxy)
2511 /* Parse the SOCKS proxy host[:port] */
2512 fwd->gateway_host = strdup(socks_proxy);
2514 if (NULL != (socks_proxy = strchr(fwd->gateway_host, ':')))
2516 *socks_proxy++ = '\0';
2517 fwd->gateway_port = strtol(socks_proxy, NULL, 0);
2520 if (fwd->gateway_port <= 0)
2522 fwd->gateway_port = 1080;
2525 http_parent = vec[2];
2529 if (NULL == http_parent)
2531 log_error(LOG_LEVEL_FATAL,
2532 "Invalid forward-override syntax in: %s", forward_override_line);
2533 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2536 /* Parse http forwarding settings */
2537 if (strcmp(http_parent, ".") != 0)
2539 fwd->forward_host = strdup(http_parent);
2541 if (NULL != (http_parent = strchr(fwd->forward_host, ':')))
2543 *http_parent++ = '\0';
2544 fwd->forward_port = strtol(http_parent, NULL, 0);
2547 if (fwd->forward_port <= 0)
2549 fwd->forward_port = 8000;
2553 assert (NULL != fwd);
2555 log_error(LOG_LEVEL_CONNECT,
2556 "Overriding forwarding settings based on \'%s\'", forward_override_line);
2562 /*********************************************************************
2564 * Function : forward_url
2566 * Description : Should we forward this to another proxy?
2569 * 1 : csp = Current client state (buffers, headers, etc...)
2570 * 2 : http = http_request request for current URL
2572 * Returns : Pointer to forwarding information.
2574 *********************************************************************/
2575 const struct forward_spec *forward_url(struct client_state *csp,
2576 const struct http_request *http)
2578 static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
2579 struct forward_spec *fwd = csp->config->forward;
2581 if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
2583 return get_forward_override_settings(csp);
2593 if (url_match(fwd->url, http))
2604 /*********************************************************************
2606 * Function : direct_response
2608 * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
2609 * request and if so, return a HTTP 501 to the client.
2611 * FIXME: I have a stupid name and I should handle the
2612 * requests properly. Still, what we do here is rfc-
2613 * compliant, whereas ignoring or forwarding are not.
2616 * 1 : csp = Current client state (buffers, headers, etc...)
2618 * Returns : http_response if , NULL if nonmatch or handler fail
2620 *********************************************************************/
2621 struct http_response *direct_response(struct client_state *csp)
2623 struct http_response *rsp;
2624 struct list_entry *p;
2626 if ((0 == strcmpic(csp->http->gpc, "trace"))
2627 || (0 == strcmpic(csp->http->gpc, "options")))
2629 for (p = csp->headers->first; (p != NULL) ; p = p->next)
2631 if (!strncmpic("Max-Forwards:", p->str, 13))
2633 unsigned int max_forwards;
2636 * If it's a Max-Forwards value of zero,
2637 * we have to intercept the request.
2639 if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
2642 * FIXME: We could handle at least TRACE here,
2643 * but that would require a verbatim copy of
2644 * the request which we don't have anymore
2646 log_error(LOG_LEVEL_HEADER,
2647 "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
2650 /* Get mem for response or fail*/
2651 if (NULL == (rsp = alloc_http_response()))
2653 return cgi_error_memory();
2656 if (NULL == (rsp->status = strdup("501 Not Implemented")))
2658 free_http_response(rsp);
2659 return cgi_error_memory();
2663 rsp->reason = RSP_REASON_UNSUPPORTED;
2665 return(finish_http_response(csp, rsp));
2674 /*********************************************************************
2676 * Function : content_filters_enabled
2678 * Description : Checks whether there are any content filters
2679 * enabled for the current request.
2682 * 1 : action = Action spec to check.
2684 * Returns : TRUE for yes, FALSE otherwise
2686 *********************************************************************/
2687 int content_filters_enabled(const struct current_action_spec *action)
2689 return ((action->flags & ACTION_DEANIMATE) ||
2690 !list_is_empty(action->multi[ACTION_MULTI_FILTER]));