1 const char filters_rcs[] = "$Id: filters.c,v 1.109 2008/11/08 15:48:41 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 1.109 2008/11/08 15:48:41 fabiankeil
44 * Mention actual values when complaining about
45 * the chunk size exceeding the buffer size.
47 * Revision 1.108 2008/05/21 15:35:08 fabiankeil
48 * - Mark csp as immutable for block_acl().
49 * - Remove an obsolete complaint about filter_popups().
51 * Revision 1.107 2008/05/04 17:52:56 fabiankeil
52 * Adjust parse_http_url() call to new prototype.
54 * Revision 1.106 2008/05/03 16:40:44 fabiankeil
55 * Change content_filters_enabled()'s parameter from
56 * csp->action to action so it can be also used in the
57 * CGI code. Don't bother checking if there are filters
58 * loaded, as that's somewhat besides the point.
60 * Revision 1.105 2008/03/28 15:13:39 fabiankeil
61 * Remove inspect-jpegs action.
63 * Revision 1.104 2008/03/27 18:27:24 fabiankeil
64 * Remove kill-popups action.
66 * Revision 1.103 2008/03/06 16:33:45 fabiankeil
67 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
69 * Revision 1.102 2008/03/01 14:00:44 fabiankeil
70 * Let the block action take the reason for the block
71 * as argument and show it on the "blocked" page.
73 * Revision 1.101 2008/02/23 16:57:12 fabiankeil
74 * Rename url_actions() to get_url_actions() and let it
75 * use the standard parameter ordering.
77 * Revision 1.100 2008/02/23 16:33:43 fabiankeil
78 * Let forward_url() use the standard parameter ordering
79 * and mark its second parameter immutable.
81 * Revision 1.99 2008/02/03 13:57:58 fabiankeil
82 * Add SOCKS5 support for forward-override{}.
84 * Revision 1.98 2008/01/04 17:43:45 fabiankeil
85 * Improve the warning messages that get logged if the action files
86 * "enable" filters but no filters of that type have been loaded.
88 * Revision 1.97 2007/11/30 15:37:03 fabiankeil
89 * Use freez instead of free.
91 * Revision 1.96 2007/10/19 16:53:28 fabiankeil
92 * Add helper function to check if any content filters are enabled.
94 * Revision 1.95 2007/10/17 19:31:20 fabiankeil
95 * Omitting the zero chunk that ends the chunk transfer encoding seems
96 * to be the new black. Log the problem and continue filtering anyway.
98 * Revision 1.94 2007/09/29 13:20:20 fabiankeil
99 * Remove two redundant and one useless log messages.
101 * Revision 1.93 2007/09/29 10:21:16 fabiankeil
102 * - Move get_filter_function() from jcc.c to filters.c
103 * so the filter functions can be static.
104 * - Don't bother filtering body-less responses.
106 * Revision 1.92 2007/09/28 16:38:55 fabiankeil
107 * - Execute content filters through execute_content_filter().
108 * - Add prepare_for_filtering() so filter functions don't have to
109 * care about de-chunking and decompression. As a side effect this enables
110 * decompression for gif_deanimate_response() and jpeg_inspect_response().
111 * - Change remove_chunked_transfer_coding()'s return type to jb_err.
112 * Some clowns feel like chunking empty responses in which case
113 * (size == 0) is valid but previously would be interpreted as error.
115 * Revision 1.91 2007/09/02 15:31:20 fabiankeil
116 * Move match_portlist() from filter.c to urlmatch.c.
117 * It's used for url matching, not for filtering.
119 * Revision 1.90 2007/09/02 12:44:17 fabiankeil
120 * Remove newline at the end of a log_error() message.
122 * Revision 1.89 2007/08/05 13:42:23 fabiankeil
123 * #1763173 from Stefan Huehner: declare some more functions static.
125 * Revision 1.88 2007/06/01 16:41:11 fabiankeil
126 * Add forward-override{} to change the forwarding settings through
127 * action sections. This is mainly interesting to forward different
128 * clients differently (for example based on User-Agent or request
131 * Revision 1.87 2007/04/30 15:53:10 fabiankeil
132 * Make sure filters with dynamic jobs actually use them.
134 * Revision 1.86 2007/04/30 15:03:28 fabiankeil
135 * - Introduce dynamic pcrs jobs that can resolve variables.
136 * - Don't run redirect functions more than once,
137 * unless they are activated more than once.
139 * Revision 1.85 2007/03/21 12:24:47 fabiankeil
140 * - Log the content size after decompression in decompress_iob()
141 * instead of pcrs_filter_response().
143 * Revision 1.84 2007/03/20 15:16:34 fabiankeil
144 * Use dedicated header filter actions instead of abusing "filter".
145 * Replace "filter-client-headers" and "filter-client-headers"
146 * with "server-header-filter" and "client-header-filter".
148 * Revision 1.83 2007/03/17 15:20:05 fabiankeil
149 * New config option: enforce-blocks.
151 * Revision 1.82 2007/03/13 11:28:43 fabiankeil
152 * - Fix port handling in acl_addr() and use a temporary acl spec
153 * copy so error messages don't contain a truncated version.
154 * - Log size of iob before and after decompression.
156 * Revision 1.81 2007/03/05 14:40:53 fabiankeil
157 * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
158 * - Hide the "Go there anyway" link for blocked CONNECT
159 * requests where going there anyway doesn't work anyway.
161 * Revision 1.80 2007/02/07 10:55:20 fabiankeil
162 * - Save the reason for generating http_responses.
163 * - Block (+block) with status code 403 instead of 404.
164 * - Use a different kludge to remember a failed decompression.
166 * Revision 1.79 2007/01/31 16:21:38 fabiankeil
167 * Search for Max-Forwards headers case-insensitive,
168 * don't generate the "501 unsupported" message for invalid
169 * Max-Forwards values and don't increase negative ones.
171 * Revision 1.78 2007/01/28 13:41:18 fabiankeil
172 * - Add HEAD support to finish_http_response.
173 * - Add error favicon to internal HTML error messages.
175 * Revision 1.77 2007/01/12 15:36:44 fabiankeil
176 * Mark *csp as immutable for is_untrusted_url()
177 * and is_imageurl(). Closes FR 1237736.
179 * Revision 1.76 2007/01/01 19:36:37 fabiankeil
180 * Integrate a modified version of Wil Mahan's
181 * zlib patch (PR #895531).
183 * Revision 1.75 2006/12/29 18:30:46 fabiankeil
184 * Fixed gcc43 conversion warnings,
185 * changed sprintf calls to snprintf.
187 * Revision 1.74 2006/12/24 17:37:38 fabiankeil
188 * Adjust comment in pcrs_filter_response()
189 * to recent pcrs changes. Hohoho.
191 * Revision 1.73 2006/12/23 16:01:02 fabiankeil
192 * Don't crash if pcre returns an error code
193 * that pcrs didn't expect. Fixes BR 1621173.
195 * Revision 1.72 2006/12/22 18:52:53 fabiankeil
196 * Modified is_untrusted_url to complain in case of
197 * write errors and to give a reason when adding new
198 * entries to the trustfile. Closes FR 1097611.
200 * Revision 1.71 2006/12/22 14:24:52 fabiankeil
201 * Skip empty filter files in pcrs_filter_response,
202 * but don't ignore the ones that come afterwards.
203 * Fixes parts of BR 1619208.
205 * Revision 1.70 2006/12/09 13:33:15 fabiankeil
206 * Added some sanity checks for get_last_url().
207 * Fixed possible segfault caused by my last commit.
209 * Revision 1.69 2006/12/08 12:39:13 fabiankeil
210 * Let get_last_url() catch https URLs as well.
212 * Revision 1.68 2006/12/05 14:45:48 fabiankeil
213 * Make sure get_last_url() behaves like advertised
214 * and fast-redirects{} can be combined with redirect{}.
216 * Revision 1.67 2006/11/28 15:19:43 fabiankeil
217 * Implemented +redirect{s@foo@bar@} to generate
218 * a redirect based on a rewritten version of the
221 * Revision 1.66 2006/09/23 13:26:38 roro
222 * Replace TABs by spaces in source code.
224 * Revision 1.65 2006/09/21 12:54:43 fabiankeil
225 * Fix +redirect{}. Didn't work with -fast-redirects.
227 * Revision 1.64 2006/08/31 10:55:49 fabiankeil
228 * Block requests for untrusted URLs with status
229 * code 403 instead of 200.
231 * Revision 1.63 2006/08/31 10:11:28 fabiankeil
232 * Don't free p which is still in use and will be later
233 * freed by free_map(). Don't claim the referrer is unknown
234 * when the client didn't set one.
236 * Revision 1.62 2006/08/14 00:27:47 david__schmidt
237 * Feature request 595948: Re-Filter logging in single line
239 * Revision 1.61 2006/08/03 02:46:41 david__schmidt
240 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
242 * Revision 1.60 2006/07/18 14:48:46 david__schmidt
243 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
244 * with what was really the latest development (the v_3_0_branch branch)
246 * Revision 1.58.2.9 2006/01/29 23:10:56 david__schmidt
247 * Multiple filter file support
249 * Revision 1.58.2.8 2005/05/07 21:50:55 david__schmidt
250 * A few memory leaks plugged (mostly on error paths)
252 * Revision 1.58.2.7 2004/10/03 12:53:32 david__schmidt
253 * Add the ability to check jpeg images for invalid
254 * lengths of comment blocks. Defensive strategy
255 * against the exploit:
256 * Microsoft Security Bulletin MS04-028
257 * Buffer Overrun in JPEG Processing (GDI+) Could
258 * Allow Code Execution (833987)
259 * Enabled with +inspect-jpegs in actions files.
261 * Revision 1.58.2.6 2003/12/06 22:18:27 gliptak
262 * Correcting compile problem with FEATURE_IMAGE_BLOCKING
264 * Revision 1.58.2.5 2003/11/11 13:10:31 oes
265 * Fixed bug #839859: "See why" link URL now gets url-encoded.
267 * Revision 1.58.2.4 2003/02/28 12:52:45 oes
270 * Revision 1.58.2.3 2002/09/25 14:51:51 oes
271 * Added basic support for OPTIONS and TRACE HTTP methods:
272 * New function direct_response which handles OPTIONS and
273 * TRACE requests whose Max-Forwards header field is zero.
275 * Revision 1.58.2.2 2002/08/01 17:18:28 oes
276 * Fixed BR 537651 / SR 579724 (MSIE image detect improper for IE/Mac)
278 * Revision 1.58.2.1 2002/07/26 15:18:53 oes
279 * - Bugfix: Executing a filters without jobs no longer results in
280 * turing off *all* filters.
281 * - Security fix: Malicious web servers can't cause a seg fault
282 * through bogus chunk sizes anymore
284 * Revision 1.58 2002/04/24 02:11:17 oes
285 * Jon's multiple AF patch: url_actions now evaluates rules
288 * Revision 1.57 2002/04/08 20:38:34 swa
291 * Revision 1.56 2002/04/05 15:51:24 oes
292 * - bugfix: error-pages now get correct request protocol
293 * - fix for invalid HTML in trust info
295 * Revision 1.55 2002/04/02 16:13:51 oes
296 * Fix: No "Go there anyway" for SSL
298 * Revision 1.54 2002/04/02 14:55:56 oes
299 * Bugfix: is_untrusted_url() now depends on FEATURE_TRUST, not FEATURE_COOKIE_JAR
301 * Revision 1.53 2002/03/26 22:29:54 swa
302 * we have a new homepage!
304 * Revision 1.52 2002/03/24 16:35:57 jongfoster
307 * Revision 1.51 2002/03/24 15:23:33 jongfoster
310 * Revision 1.50 2002/03/24 13:25:43 swa
311 * name change related issues
313 * Revision 1.49 2002/03/16 20:29:14 oes
316 * Revision 1.48 2002/03/13 20:25:34 oes
317 * Better logging for content filters
319 * Revision 1.47 2002/03/13 00:30:52 jongfoster
321 * Added option of always sending redirect for imageblock,
322 * currently disabled with #if 0.
324 * Revision 1.46 2002/03/12 01:42:49 oes
325 * Introduced modular filters
327 * Revision 1.45 2002/03/08 16:47:50 oes
328 * Added choice beween GIF and PNG built-in images
330 * Revision 1.44 2002/03/07 03:49:31 oes
331 * - Fixed compiler warnings etc
332 * - Changed built-in images from GIF to PNG
333 * (with regard to Unisys patent issue)
334 * - Added a 4x4 pattern PNG which is less intrusive
335 * than the logo but also clearly marks the deleted banners
337 * Revision 1.43 2002/01/22 23:51:59 jongfoster
338 * Replacing strsav() with the safer string_append().
340 * Adding missing html_encode() to error message generators. Where encoded
341 * and unencoded versions of a string were provided, removing the unencoded
344 * Revision 1.42 2002/01/17 21:00:32 jongfoster
345 * Moving all our URL and URL pattern parsing code to urlmatch.c.
347 * Using a single, simple url_match(pattern,url) function - rather than
348 * the 3-line match routine which was repeated all over the place.
350 * Renaming free_url to free_url_spec, since it frees a struct url_spec.
352 * Using parse_http_url() to parse URLs without faking a HTTP
353 * request line for parse_http_request().
355 * Revision 1.41 2001/11/13 00:14:07 jongfoster
356 * Fixing stupid bug now I've figured out what || means.
357 * (It always returns 0 or 1, not one of it's paramaters.)
359 * Revision 1.40 2001/10/26 17:37:55 oes
360 * - Re-enabled Netscape 200/404 bug workaround in block_url():
361 * - Removed OS/2 special case
362 * - Made block_url() independant from sed() having been run
363 * - Made trust_url independant from sed() having been run
364 * - Made is_imageurl independant from sed() having been run.
365 * It now checks User-Agent: and Accept: by itself.
368 * Revision 1.39 2001/10/25 03:40:48 david__schmidt
369 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
370 * threads to call select() simultaneously. So, it's time to do a real, live,
371 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
372 * (native). Both versions will work, but using __OS2__ offers multi-threading.
374 * Revision 1.38 2001/10/23 21:32:33 jongfoster
375 * Adding error-checking to selected functions
377 * Revision 1.37 2001/10/22 15:33:56 david__schmidt
378 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
379 * filters.c. Added a FIXME in front of the offending code. I'll gladly
380 * put in a better/more robust fix for all parties if one is presented...
381 * It seems that just returning 200 instead of 404 would pretty much fix
382 * it for everyone, but I don't know all the history of the problem.
384 * Revision 1.36 2001/10/10 16:44:16 oes
385 * Added match_portlist function
387 * Revision 1.35 2001/10/07 15:41:23 oes
388 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
390 * New function remove_chunked_transfer_coding that strips chunked
391 * transfer coding to plain and is called by pcrs_filter_response
392 * and gif_deanimate_response if neccessary
394 * Improved handling of zero-change re_filter runs
396 * pcrs_filter_response and gif_deanimate_response now remove
397 * chunked transfer codeing before processing the body.
399 * Revision 1.34 2001/09/20 15:49:36 steudten
401 * Fix BUG: Change int size to size_t size in pcrs_filter_response().
402 * See cgi.c fill_template().
404 * Revision 1.33 2001/09/16 17:05:14 jongfoster
405 * Removing unused #include showarg.h
407 * Revision 1.32 2001/09/16 13:21:27 jongfoster
408 * Changes to use new list functions.
410 * Revision 1.31 2001/09/16 11:38:02 jongfoster
411 * Splitting fill_template() into 2 functions:
412 * template_load() loads the file
413 * template_fill() performs the PCRS regexps.
414 * This is because the CGI edit interface has a "table row"
415 * template which is used many times in the page - this
416 * change means it's only loaded from disk once.
418 * Revision 1.30 2001/09/16 11:00:10 jongfoster
419 * New function alloc_http_response, for symmetry with free_http_response
421 * Revision 1.29 2001/09/13 23:32:40 jongfoster
422 * Moving image data to cgi.c rather than cgi.h
423 * Fixing a GPF under Win32 (and any other OS that protects global
424 * constants from being written to).
426 * Revision 1.28 2001/09/10 10:18:51 oes
427 * Silenced compiler warnings
429 * Revision 1.27 2001/08/05 16:06:20 jongfoster
430 * Modifiying "struct map" so that there are now separate header and
431 * "map_entry" structures. This means that functions which modify a
432 * map no longer need to return a pointer to the modified map.
433 * Also, it no longer reverses the order of the entries (which may be
434 * important with some advanced template substitutions).
436 * Revision 1.26 2001/07/30 22:08:36 jongfoster
437 * Tidying up #defines:
438 * - All feature #defines are now of the form FEATURE_xxx
439 * - Permanently turned off WIN_GUI_EDIT
440 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
442 * Revision 1.25 2001/07/26 10:09:46 oes
443 * Made browser detection a little less naive
445 * Revision 1.24 2001/07/25 17:22:51 oes
446 * Added workaround for Netscape bug that prevents display of page when loading a component fails.
448 * Revision 1.23 2001/07/23 13:40:12 oes
449 * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
451 * Revision 1.22 2001/07/18 12:29:34 oes
452 * - Made gif_deanimate_response respect
453 * csp->action->string[ACTION_STRING_DEANIMATE]
454 * - Logging cosmetics
456 * Revision 1.21 2001/07/13 13:59:53 oes
457 * - Introduced gif_deanimate_response which shares the
458 * generic content modification interface of pcrs_filter_response
459 * and acts as a wrapper to deanimate.c:gif_deanimate()
460 * - Renamed re_process_buffer to pcrs_filter_response
461 * - pcrs_filter_response now returns NULL on failiure
462 * - Removed all #ifdef PCRS
464 * Revision 1.20 2001/07/01 17:01:04 oes
465 * Added comments and missing return statement in is_untrusted_url()
467 * Revision 1.19 2001/06/29 21:45:41 oes
468 * Indentation, CRLF->LF, Tab-> Space
470 * Revision 1.18 2001/06/29 13:27:38 oes
471 * - Cleaned up, renamed and reorderd functions
472 * and improved comments
475 * - Ported to CGI platform. Now delivers
476 * http_response or NULL
477 * - Unified HTML and GIF generation (moved image detection
478 * and GIF generation here from jcc.c:chat())
479 * - Fixed HTTP status to:
480 * - 403 (Forbidden) for the "blocked" HTML message
481 * - 200 (OK) for GIF answers
482 * - 302 (Redirect) for redirect to GIF
485 * - Ported to CGI platform. Now delivers
486 * http_response or NULL
487 * - Separated detection of untrusted URL into
488 * (bool)is_untrusted_url
489 * - Added enforcement of untrusted requests
491 * - Moved redirect_url() from cgi.c to here
492 * and ported it to the CGI platform
494 * - Removed logentry from cancelled commit
496 * Revision 1.17 2001/06/09 10:55:28 jongfoster
497 * Changing BUFSIZ ==> BUFFER_SIZE
499 * Revision 1.16 2001/06/07 23:10:26 jongfoster
500 * Allowing unanchored domain patterns to back off and retry
501 * if they partially match. Optimized right-anchored patterns.
502 * Moving ACL and forward files into config file.
503 * Replacing struct gateway with struct forward_spec
505 * Revision 1.15 2001/06/03 19:12:00 oes
506 * extracted-CGI relevant stuff
508 * Revision 1.14 2001/06/01 10:30:55 oes
509 * Added optional left-anchoring to domaincmp
511 * Revision 1.13 2001/05/31 21:21:30 jongfoster
512 * Permissionsfile / actions file changes:
513 * - Changed "permission" to "action" throughout
514 * - changes to file format to allow string parameters
515 * - Moved helper functions to actions.c
517 * Revision 1.12 2001/05/31 17:35:20 oes
519 * - Enhanced domain part globbing with infix and prefix asterisk
520 * matching and optional unanchored operation
522 * Revision 1.11 2001/05/29 11:53:23 oes
523 * "See why" link added to "blocked" page
525 * Revision 1.10 2001/05/29 09:50:24 jongfoster
526 * Unified blocklist/imagelist/permissionslist.
527 * File format is still under discussion, but the internal changes
530 * Also modified interceptor behaviour:
531 * - We now intercept all URLs beginning with one of the following
532 * prefixes (and *only* these prefixes):
534 * * http://ijbswa.sf.net/config/
535 * * http://ijbswa.sourceforge.net/config/
536 * - New interceptors "home page" - go to http://i.j.b/ to see it.
537 * - Internal changes so that intercepted and fast redirect pages
538 * are not replaced with an image.
539 * - Interceptors now have the option to send a binary page direct
540 * to the client. (i.e. ijb-send-banner uses this)
541 * - Implemented show-url-info interceptor. (Which is why I needed
542 * the above interceptors changes - a typical URL is
543 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
544 * The previous mechanism would not have intercepted that, and
545 * if it had been intercepted then it then it would have replaced
548 * Revision 1.9 2001/05/27 22:17:04 oes
550 * - re_process_buffer no longer writes the modified buffer
551 * to the client, which was very ugly. It now returns the
552 * buffer, which it is then written by chat.
554 * - content_length now adjusts the Content-Length: header
555 * for modified documents rather than crunch()ing it.
556 * (Length info in csp->content_length, which is 0 for
557 * unmodified documents)
559 * - For this to work, sed() is called twice when filtering.
561 * Revision 1.8 2001/05/26 17:13:28 jongfoster
562 * Filled in a function comment.
564 * Revision 1.7 2001/05/26 15:26:15 jongfoster
565 * ACL feature now provides more security by immediately dropping
566 * connections from untrusted hosts.
568 * Revision 1.6 2001/05/26 00:28:36 jongfoster
569 * Automatic reloading of config file.
570 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
571 * Most of the global variables have been moved to a new
572 * struct configuration_spec, accessed through csp->config->globalname
573 * Most of the globals remaining are used by the Win32 GUI.
575 * Revision 1.5 2001/05/25 22:34:30 jongfoster
578 * Revision 1.4 2001/05/22 18:46:04 oes
580 * - Enabled filtering banners by size rather than URL
581 * by adding patterns that replace all standard banner
582 * sizes with the "Junkbuster" gif to the re_filterfile
584 * - Enabled filtering WebBugs by providing a pattern
585 * which kills all 1x1 images
587 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
588 * which is selected by the (nonstandard and therefore
589 * capital) letter 'U' in the option string.
590 * It causes the quantifiers to be ungreedy by default.
591 * Appending a ? turns back to greedy (!).
593 * - Added a new interceptor ijb-send-banner, which
594 * sends back the "Junkbuster" gif. Without imagelist or
595 * MSIE detection support, or if tinygif = 1, or the
596 * URL isn't recognized as an imageurl, a lame HTML
597 * explanation is sent instead.
599 * - Added new feature, which permits blocking remote
600 * script redirects and firing back a local redirect
602 * The feature is conditionally compiled, i.e. it
603 * can be disabled with --disable-fast-redirects,
604 * plus it must be activated by a "fast-redirects"
605 * line in the config file, has its own log level
606 * and of course wants to be displayed by show-proxy-args
607 * Note: Boy, all the #ifdefs in 1001 locations and
608 * all the fumbling with configure.in and acconfig.h
609 * were *way* more work than the feature itself :-(
611 * - Because a generic redirect template was needed for
612 * this, tinygif = 3 now uses the same.
614 * - Moved GIFs, and other static HTTP response templates
619 * - Removed some >400 CRs again (Jon, you really worked
622 * Revision 1.3 2001/05/20 16:44:47 jongfoster
623 * Removing last hardcoded Junkbusters.com URLs.
625 * Revision 1.2 2001/05/20 01:21:20 jongfoster
626 * Version 2.9.4 checkin.
627 * - Merged popupfile and cookiefile, and added control over PCRS
628 * filtering, in new "permissionsfile".
629 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
630 * file error you now get a message box (in the Win32 GUI) rather
631 * than the program exiting with no explanation.
632 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
634 * - Removed tabs from "config"
635 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
636 * - Bumped up version number.
638 * Revision 1.1.1.1 2001/05/15 13:58:52 oes
639 * Initial import of version 2.9.3 source tree
642 *********************************************************************/
648 #include <sys/types.h>
657 #endif /* ndef __OS2__ */
658 #include <netinet/in.h>
660 #include <winsock2.h>
661 #endif /* ndef _WIN32 */
665 #endif /* def __OS2__ */
673 #include "jbsockets.h"
674 #include "miscutil.h"
678 #include "deanimate.h"
679 #include "urlmatch.h"
686 const char filters_h_rcs[] = FILTERS_H_VERSION;
688 /* Fix a problem with Solaris. There should be no effect on other
690 * Solaris's isspace() is a macro which uses it's argument directly
691 * as an array index. Therefore we need to make sure that high-bit
692 * characters generate +ve values, and ideally we also want to make
693 * the argument match the declared parameter type of "int".
695 #define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
697 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
698 static jb_err prepare_for_filtering(struct client_state *csp);
701 /*********************************************************************
703 * Function : block_acl
705 * Description : Block this request?
706 * Decide yes or no based on ACL file.
709 * 1 : dst = The proxy or gateway address this is going to.
710 * Or NULL to check all possible targets.
711 * 2 : csp = Current client state (buffers, headers, etc...)
712 * Also includes the client IP address.
714 * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
716 *********************************************************************/
717 int block_acl(const struct access_control_addr *dst, const struct client_state *csp)
719 struct access_control_list *acl = csp->config->acl;
721 /* if not using an access control list, then permit the connection */
727 /* search the list */
730 if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
734 /* Just want to check if they have any access */
735 if (acl->action == ACL_PERMIT)
740 else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
741 && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
743 if (acl->action == ACL_PERMIT)
761 /*********************************************************************
763 * Function : acl_addr
765 * Description : Called from `load_config' to parse an ACL address.
768 * 1 : aspec = String specifying ACL address.
769 * 2 : aca = struct access_control_addr to fill in.
771 * Returns : 0 => Ok, everything else is an error.
773 *********************************************************************/
774 int acl_addr(const char *aspec, struct access_control_addr *aca)
779 char *acl_spec = NULL;
785 * Use a temporary acl spec copy so we can log
786 * the unmodified original in case of parse errors.
788 acl_spec = strdup(aspec);
789 if (acl_spec == NULL)
791 /* XXX: This will be logged as parse error. */
795 if ((p = strchr(acl_spec, '/')) != NULL)
798 if (ijb_isdigit(*p) == 0)
803 masklength = atoi(p);
806 if ((masklength < 0) || (masklength > 32))
812 if ((p = strchr(acl_spec, ':')) != NULL)
817 port = strtol(p, &endptr, 10);
819 if (port <= 0 || port > 65535 || *endptr != '\0')
826 aca->port = (unsigned long)port;
828 aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
831 if (aca->addr == INADDR_NONE)
833 /* XXX: This will be logged as parse error. */
837 /* build the netmask */
839 for (i=1; i <= masklength ; i++)
841 aca->mask |= (1U << (32 - i));
844 /* now mask off the host portion of the ip address
845 * (i.e. save on the network portion of the address).
847 aca->addr = aca->addr & aca->mask;
852 #endif /* def FEATURE_ACL */
855 /*********************************************************************
857 * Function : connect_port_is_forbidden
859 * Description : Check to see if CONNECT requests to the destination
860 * port of this request are forbidden. The check is
861 * independend of the actual request method.
864 * 1 : csp = Current client state (buffers, headers, etc...)
866 * Returns : True if yes, false otherwise.
868 *********************************************************************/
869 int connect_port_is_forbidden(const struct client_state *csp)
871 return ((csp->action->flags & ACTION_LIMIT_CONNECT) &&
872 !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT],
877 /*********************************************************************
879 * Function : block_url
881 * Description : Called from `chat'. Check to see if we need to block this.
884 * 1 : csp = Current client state (buffers, headers, etc...)
886 * Returns : NULL => unblocked, else HTTP block response
888 *********************************************************************/
889 struct http_response *block_url(struct client_state *csp)
891 struct http_response *rsp;
892 const char *new_content_type = NULL;
895 * If it's not blocked, don't block it ;-)
897 if ((csp->action->flags & ACTION_BLOCK) == 0)
901 if (csp->action->flags & ACTION_REDIRECT)
903 log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
906 * Else, prepare a response
908 if (NULL == (rsp = alloc_http_response()))
910 return cgi_error_memory();
914 * If it's an image-url, send back an image or redirect
915 * as specified by the relevant +image action
917 #ifdef FEATURE_IMAGE_BLOCKING
918 if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
922 /* determine HOW images should be blocked */
923 p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
925 if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
927 log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
929 #if 1 /* Two alternative strategies, use this one for now: */
931 /* and handle accordingly: */
932 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
934 rsp->status = strdup("403 Request blocked by Privoxy");
935 if (rsp->status == NULL)
937 free_http_response(rsp);
938 return cgi_error_memory();
940 rsp->body = bindup(image_pattern_data, image_pattern_length);
941 if (rsp->body == NULL)
943 free_http_response(rsp);
944 return cgi_error_memory();
946 rsp->content_length = image_pattern_length;
948 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
950 free_http_response(rsp);
951 return cgi_error_memory();
955 else if (0 == strcmpic(p, "blank"))
957 rsp->status = strdup("403 Request blocked by Privoxy");
958 if (rsp->status == NULL)
960 free_http_response(rsp);
961 return cgi_error_memory();
963 rsp->body = bindup(image_blank_data, image_blank_length);
964 if (rsp->body == NULL)
966 free_http_response(rsp);
967 return cgi_error_memory();
969 rsp->content_length = image_blank_length;
971 if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
973 free_http_response(rsp);
974 return cgi_error_memory();
980 rsp->status = strdup("302 Local Redirect from Privoxy");
981 if (rsp->status == NULL)
983 free_http_response(rsp);
984 return cgi_error_memory();
987 if (enlist_unique_header(rsp->headers, "Location", p))
989 free_http_response(rsp);
990 return cgi_error_memory();
994 #else /* Following code is disabled for now */
996 /* and handle accordingly: */
997 if ((p == NULL) || (0 == strcmpic(p, "pattern")))
999 p = CGI_PREFIX "send-banner?type=pattern";
1001 else if (0 == strcmpic(p, "blank"))
1003 p = CGI_PREFIX "send-banner?type=blank";
1005 rsp->status = strdup("302 Local Redirect from Privoxy");
1006 if (rsp->status == NULL)
1008 free_http_response(rsp);
1009 return cgi_error_memory();
1012 if (enlist_unique_header(rsp->headers, "Location", p))
1014 free_http_response(rsp);
1015 return cgi_error_memory();
1017 #endif /* Preceeding code is disabled for now */
1019 else if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
1022 * Send empty document.
1024 new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
1027 rsp->body = strdup(" ");
1028 rsp->content_length = 1;
1030 rsp->status = strdup("403 Request blocked by Privoxy");
1031 if (rsp->status == NULL)
1033 free_http_response(rsp);
1034 return cgi_error_memory();
1036 if (new_content_type != 0)
1038 log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
1039 if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
1041 free_http_response(rsp);
1042 return cgi_error_memory();
1047 #endif /* def FEATURE_IMAGE_BLOCKING */
1050 * Else, generate an HTML "blocked" message:
1054 struct map * exports;
1058 * Workaround for stupid Netscape bug which prevents
1059 * pages from being displayed if loading a referenced
1060 * JavaScript or style sheet fails. So make it appear
1061 * as if it succeeded.
1063 if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
1064 && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
1065 && !strstr(p, "Gecko") /* save Mozilla, */
1066 && !strstr(p, "compatible") /* MSIE */
1067 && !strstr(p, "Opera")) /* and Opera. */
1069 rsp->status = strdup("200 Request for blocked URL");
1073 rsp->status = strdup("403 Request for blocked URL");
1076 if (rsp->status == NULL)
1078 free_http_response(rsp);
1079 return cgi_error_memory();
1082 exports = default_exports(csp, NULL);
1083 if (exports == NULL)
1085 free_http_response(rsp);
1086 return cgi_error_memory();
1089 #ifdef FEATURE_FORCE_LOAD
1090 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1092 * Export the force conditional block killer if
1094 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1095 * - Privoxy is configured to enforce blocks, or
1096 * - it's a CONNECT request and enforcing wouldn't work anyway.
1098 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1099 || (0 == strcmpic(csp->http->gpc, "connect")))
1100 #endif /* ndef FEATURE_FORCE_LOAD */
1102 err = map_block_killer(exports, "force-support");
1105 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1106 if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
1107 if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
1108 if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
1111 const char *block_reason;
1112 if (csp->action->string[ACTION_STRING_BLOCK] != NULL)
1114 block_reason = csp->action->string[ACTION_STRING_BLOCK];
1118 assert(connect_port_is_forbidden(csp));
1119 block_reason = "Forbidden CONNECT port.";
1121 err = map(exports, "block-reason", 1, html_encode(block_reason), 0);
1126 free_http_response(rsp);
1127 return cgi_error_memory();
1130 err = template_fill_for_cgi(csp, "blocked", exports, rsp);
1133 free_http_response(rsp);
1134 return cgi_error_memory();
1137 rsp->reason = RSP_REASON_BLOCKED;
1139 return finish_http_response(csp, rsp);
1144 #ifdef FEATURE_TRUST
1145 /*********************************************************************
1147 * Function : trust_url FIXME: I should be called distrust_url
1149 * Description : Calls is_untrusted_url to determine if the URL is trusted
1150 * and if not, returns a HTTP 403 response with a reject message.
1153 * 1 : csp = Current client state (buffers, headers, etc...)
1155 * Returns : NULL => trusted, else http_response.
1157 *********************************************************************/
1158 struct http_response *trust_url(struct client_state *csp)
1160 struct http_response *rsp;
1161 struct map * exports;
1162 char buf[BUFFER_SIZE];
1164 struct url_spec **tl;
1169 * Don't bother to work on trusted URLs
1171 if (!is_untrusted_url(csp))
1177 * Else, prepare a response:
1179 if (NULL == (rsp = alloc_http_response()))
1181 return cgi_error_memory();
1184 rsp->status = strdup("403 Request blocked by Privoxy");
1185 exports = default_exports(csp, NULL);
1186 if (exports == NULL || rsp->status == NULL)
1188 free_http_response(rsp);
1189 return cgi_error_memory();
1193 * Export the protocol, host, port, and referrer information
1195 err = map(exports, "hostport", 1, csp->http->hostport, 1);
1196 if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
1197 if (!err) err = map(exports, "path", 1, csp->http->path, 1);
1199 if (NULL != (p = get_header_value(csp->headers, "Referer:")))
1201 if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
1205 if (!err) err = map(exports, "referrer", 1, "none set", 1);
1211 free_http_response(rsp);
1212 return cgi_error_memory();
1216 * Export the trust list
1219 for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
1221 snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
1222 string_append(&p, buf);
1224 err = map(exports, "trusted-referrers", 1, p, 0);
1229 free_http_response(rsp);
1230 return cgi_error_memory();
1234 * Export the trust info, if available
1236 if (csp->config->trust_info->first)
1238 struct list_entry *l;
1241 for (l = csp->config->trust_info->first; l ; l = l->next)
1243 snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
1244 string_append(&p, buf);
1246 err = map(exports, "trust-info", 1, p, 0);
1250 err = map_block_killer(exports, "have-trust-info");
1256 free_http_response(rsp);
1257 return cgi_error_memory();
1261 * Export the force conditional block killer if
1263 * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
1264 * - Privoxy is configured to enforce blocks, or
1265 * - it's a CONNECT request and enforcing wouldn't work anyway.
1267 #ifdef FEATURE_FORCE_LOAD
1268 if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1269 || (0 == strcmpic(csp->http->gpc, "connect")))
1271 err = map_block_killer(exports, "force-support");
1275 err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
1277 #else /* ifndef FEATURE_FORCE_LOAD */
1278 err = map_block_killer(exports, "force-support");
1279 #endif /* ndef FEATURE_FORCE_LOAD */
1284 free_http_response(rsp);
1285 return cgi_error_memory();
1289 * Build the response
1291 err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
1294 free_http_response(rsp);
1295 return cgi_error_memory();
1297 rsp->reason = RSP_REASON_UNTRUSTED;
1299 return finish_http_response(csp, rsp);
1301 #endif /* def FEATURE_TRUST */
1304 /*********************************************************************
1306 * Function : compile_dynamic_pcrs_job_list
1308 * Description : Compiles a dynamic pcrs job list (one with variables
1309 * resolved at request time)
1312 * 1 : csp = Current client state (buffers, headers, etc...)
1313 * 2 : b = The filter list to compile
1315 * Returns : NULL in case of errors, otherwise the
1318 *********************************************************************/
1319 pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
1321 struct list_entry *pattern;
1322 pcrs_job *job_list = NULL;
1323 pcrs_job *dummy = NULL;
1324 pcrs_job *lastjob = NULL;
1327 const struct pcrs_variable variables[] =
1329 {"url", csp->http->url, 1},
1330 {"path", csp->http->path, 1},
1331 {"host", csp->http->host, 1},
1332 {"origin", csp->ip_addr_str, 1},
1336 for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
1338 assert(pattern->str != NULL);
1340 dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
1344 log_error(LOG_LEVEL_ERROR,
1345 "Adding filter job \'%s\' to dynamic filter %s failed: %s",
1346 pattern->str, b->name, pcrs_strerror(error));
1351 if (error == PCRS_WARN_TRUNCATION)
1353 log_error(LOG_LEVEL_ERROR,
1354 "At least one of the variables in \'%s\' had to "
1355 "be truncated before compilation", pattern->str);
1357 if (job_list == NULL)
1363 lastjob->next = dummy;
1373 /*********************************************************************
1375 * Function : rewrite_url
1377 * Description : Rewrites a URL with a single pcrs command
1378 * and returns the result if it differs from the
1379 * original and isn't obviously invalid.
1382 * 1 : old_url = URL to rewrite.
1383 * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
1386 * Returns : NULL if the pcrs_command didn't change the url, or
1387 * the result of the modification.
1389 *********************************************************************/
1390 char *rewrite_url(char *old_url, const char *pcrs_command)
1392 char *new_url = NULL;
1396 assert(pcrs_command);
1398 new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
1402 log_error(LOG_LEVEL_REDIRECTS,
1403 "pcrs command \"%s\" didn't change \"%s\".",
1404 pcrs_command, old_url);
1409 log_error(LOG_LEVEL_REDIRECTS,
1410 "executing pcrs command \"%s\" to rewrite %s failed: %s",
1411 pcrs_command, old_url, pcrs_strerror(hits));
1414 else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
1416 log_error(LOG_LEVEL_ERROR,
1417 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
1418 "but the result doesn't look like a valid URL and will be ignored.",
1419 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1424 log_error(LOG_LEVEL_REDIRECTS,
1425 "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
1426 pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
1434 #ifdef FEATURE_FAST_REDIRECTS
1435 /*********************************************************************
1437 * Function : get_last_url
1439 * Description : Search for the last URL inside a string.
1440 * If the string already is a URL, it will
1441 * be the first URL found.
1444 * 1 : subject = the string to check
1445 * 2 : redirect_mode = +fast-redirect{} mode
1447 * Returns : NULL if no URL was found, or
1448 * the last URL found.
1450 *********************************************************************/
1451 char *get_last_url(char *subject, const char *redirect_mode)
1453 char *new_url = NULL;
1457 assert(redirect_mode);
1459 subject = strdup(subject);
1460 if (subject == NULL)
1462 log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
1466 if (0 == strcmpic(redirect_mode, "check-decoded-url"))
1468 log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
1469 new_url = url_decode(subject);
1470 if (new_url != NULL)
1477 log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
1481 log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
1484 * Find the last URL encoded in the request
1487 while ((tmp = strstr(tmp, "http://")) != NULL)
1491 tmp = (new_url != NULL) ? new_url : subject;
1492 while ((tmp = strstr(tmp, "https://")) != NULL)
1497 if ((new_url != NULL)
1498 && ( (new_url != subject)
1499 || (0 == strncmpic(subject, "http://", 7))
1500 || (0 == strncmpic(subject, "https://", 8))
1504 * Return new URL if we found a redirect
1505 * or if the subject already was a URL.
1507 * The second case makes sure that we can
1508 * chain get_last_url after another redirection check
1509 * (like rewrite_url) without losing earlier redirects.
1511 new_url = strdup(new_url);
1520 #endif /* def FEATURE_FAST_REDIRECTS */
1523 /*********************************************************************
1525 * Function : redirect_url
1527 * Description : Checks if Privoxy should answer the request with
1528 * a HTTP redirect and generates the redirect if
1532 * 1 : csp = Current client state (buffers, headers, etc...)
1534 * Returns : NULL if the request can pass, HTTP redirect otherwise.
1536 *********************************************************************/
1537 struct http_response *redirect_url(struct client_state *csp)
1539 struct http_response *rsp;
1540 #ifdef FEATURE_FAST_REDIRECTS
1542 * XXX: Do we still need FEATURE_FAST_REDIRECTS
1543 * as compile-time option? The user can easily disable
1544 * it in his action file.
1546 char * redirect_mode;
1547 #endif /* def FEATURE_FAST_REDIRECTS */
1548 char *old_url = NULL;
1549 char *new_url = NULL;
1550 char *redirection_string;
1552 if ((csp->action->flags & ACTION_REDIRECT))
1554 redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
1557 * If the redirection string begins with 's',
1558 * assume it's a pcrs command, otherwise treat it as
1559 * properly formatted URL and use it for the redirection
1562 * According to RFC 2616 section 14.30 the URL
1563 * has to be absolute and if the user tries:
1564 * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
1565 * she would get undefined results anyway.
1569 if (*redirection_string == 's')
1571 old_url = csp->http->url;
1572 new_url = rewrite_url(old_url, redirection_string);
1576 log_error(LOG_LEVEL_REDIRECTS,
1577 "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
1578 redirection_string);
1579 new_url = strdup(redirection_string);
1583 #ifdef FEATURE_FAST_REDIRECTS
1584 if ((csp->action->flags & ACTION_FAST_REDIRECTS))
1586 redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
1589 * If it exists, use the previously rewritten URL as input
1590 * otherwise just use the old path.
1592 old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
1593 new_url = get_last_url(old_url, redirect_mode);
1598 * Disable redirect checkers, so that they
1599 * will be only run more than once if the user
1600 * also enables them through tags.
1602 * From a performance point of view
1603 * it doesn't matter, but the duplicated
1604 * log messages are annoying.
1606 csp->action->flags &= ~ACTION_FAST_REDIRECTS;
1607 #endif /* def FEATURE_FAST_REDIRECTS */
1608 csp->action->flags &= ~ACTION_REDIRECT;
1610 /* Did any redirect action trigger? */
1613 if (0 == strcmpic(new_url, csp->http->url))
1615 log_error(LOG_LEVEL_ERROR,
1616 "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
1617 csp->http->url, new_url);
1622 log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
1624 if (NULL == (rsp = alloc_http_response()))
1627 return cgi_error_memory();
1630 if ( enlist_unique_header(rsp->headers, "Location", new_url)
1631 || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
1634 free_http_response(rsp);
1635 return cgi_error_memory();
1637 rsp->reason = RSP_REASON_REDIRECTED;
1640 return finish_http_response(csp, rsp);
1644 /* Only reached if no redirect is required */
1650 #ifdef FEATURE_IMAGE_BLOCKING
1651 /*********************************************************************
1653 * Function : is_imageurl
1655 * Description : Given a URL, decide whether it is an image or not,
1656 * using either the info from a previous +image action
1657 * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
1658 * is MSIE and not on a Mac, tell from the browser's accept
1662 * 1 : csp = Current client state (buffers, headers, etc...)
1664 * Returns : True (nonzero) if URL is an image, false (0)
1667 *********************************************************************/
1668 int is_imageurl(const struct client_state *csp)
1670 #ifdef FEATURE_IMAGE_DETECT_MSIE
1673 tmp = get_header_value(csp->headers, "User-Agent:");
1674 if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
1676 tmp = get_header_value(csp->headers, "Accept:");
1677 if (tmp && strstr(tmp, "image/gif"))
1679 /* Client will accept HTML. If this seems counterintuitive,
1689 #endif /* def FEATURE_IMAGE_DETECT_MSIE */
1691 return ((csp->action->flags & ACTION_IMAGE) != 0);
1694 #endif /* def FEATURE_IMAGE_BLOCKING */
1697 #ifdef FEATURE_TRUST
1698 /*********************************************************************
1700 * Function : is_untrusted_url
1702 * Description : Should we "distrust" this URL (and block it)?
1704 * Yes if it matches a line in the trustfile, or if the
1705 * referrer matches a line starting with "+" in the
1710 * 1 : csp = Current client state (buffers, headers, etc...)
1712 * Returns : 0 => trusted, 1 => untrusted
1714 *********************************************************************/
1715 int is_untrusted_url(const struct client_state *csp)
1717 struct file_list *fl;
1718 struct block_spec *b;
1719 struct url_spec **trusted_url;
1720 struct http_request rhttp[1];
1721 const char * referer;
1725 * If we don't have a trustlist, we trust everybody
1727 if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
1732 memset(rhttp, '\0', sizeof(*rhttp));
1735 * Do we trust the request URL itself?
1737 for (b = b->next; b ; b = b->next)
1739 if (url_match(b->url, csp->http))
1745 if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
1747 /* no referrer was supplied */
1753 * If not, do we maybe trust its referrer?
1755 err = parse_http_url(referer, rhttp, REQUIRE_PROTOCOL);
1761 for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
1763 if (url_match(*trusted_url, rhttp))
1765 /* if the URL's referrer is from a trusted referrer, then
1766 * add the target spec to the trustfile as an unblocked
1767 * domain and return 0 (which means it's OK).
1772 if (NULL != (fp = fopen(csp->config->trustfile, "a")))
1776 char * new_entry = strdup("~");
1778 string_append(&new_entry, csp->http->hostport);
1780 path = csp->http->path;
1781 if ( (path[0] == '/')
1783 && ((path_end = strchr(path + 2, '/')) != NULL))
1785 /* since this path points into a user's home space
1786 * be sure to include this spec in the trustfile.
1788 int path_len = path_end - path; /* save offset */
1789 path = strdup(path); /* Copy string */
1792 path_end = path + path_len; /* regenerate ptr to new buffer */
1793 *(path_end + 1) = '\0'; /* Truncate path after '/' */
1795 string_join(&new_entry, path);
1799 * Give a reason for generating this entry.
1801 string_append(&new_entry, " # Trusted referrer was: ");
1802 string_append(&new_entry, referer);
1804 if (new_entry != NULL)
1806 if (-1 == fprintf(fp, "%s\n", new_entry))
1808 log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
1809 new_entry, csp->config->trustfile);
1815 /* FIXME: No way to handle out-of memory, so mostly ignoring it */
1816 log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
1823 log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
1824 csp->http->hostport, csp->config->trustfile);
1832 #endif /* def FEATURE_TRUST */
1835 /*********************************************************************
1837 * Function : pcrs_filter_response
1839 * Description : Execute all text substitutions from all applying
1840 * +filter actions on the text buffer that's been
1841 * accumulated in csp->iob->buf.
1844 * 1 : csp = Current client state (buffers, headers, etc...)
1846 * Returns : a pointer to the (newly allocated) modified buffer.
1847 * or NULL if there were no hits or something went wrong
1849 *********************************************************************/
1850 static char *pcrs_filter_response(struct client_state *csp)
1853 size_t size, prev_size;
1859 struct file_list *fl;
1860 struct re_filterfile_spec *b;
1861 struct list_entry *filtername;
1863 int i, found_filters = 0;
1868 if (csp->iob->cur >= csp->iob->eod)
1874 * Need to check the set of re_filterfiles...
1876 for (i = 0; i < MAX_AF_FILES; i++)
1889 if (0 == found_filters)
1891 log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
1892 "content filtering enabled, but no content filters available.");
1896 size = (size_t)(csp->iob->eod - csp->iob->cur);
1897 old = csp->iob->cur;
1899 for (i = 0; i < MAX_AF_FILES; i++)
1902 if ((NULL == fl) || (NULL == fl->f))
1905 * Either there are no filter files
1906 * left, or this filter file just
1907 * contains no valid filters.
1909 * Continue to be sure we don't miss
1910 * valid filter files that are chained
1911 * after empty or invalid ones.
1916 * For all applying +filter actions, look if a filter by that
1917 * name exists and if yes, execute it's pcrs_joblist on the
1920 for (b = fl->f; b; b = b->next)
1922 if (b->type != FT_CONTENT_FILTER)
1924 /* Skip header filters */
1928 for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
1929 filtername ; filtername = filtername->next)
1931 if (strcmp(b->name, filtername->str) == 0)
1933 int current_hits = 0; /* Number of hits caused by this filter */
1934 int job_number = 0; /* Which job we're currently executing */
1935 int job_hits = 0; /* How many hits the current job caused */
1936 pcrs_job *joblist = b->joblist;
1938 if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
1940 if (NULL == joblist)
1942 log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
1947 /* Apply all jobs from the joblist */
1948 for (job = joblist; NULL != job; job = job->next)
1951 job_hits = pcrs_execute(job, old, size, &new, &size);
1956 * That went well. Continue filtering
1957 * and use the result of this job as
1958 * input for the next one.
1960 current_hits += job_hits;
1961 if (old != csp->iob->cur)
1970 * This job caused an unexpected error. Inform the user
1971 * and skip the rest of the jobs in this filter. We could
1972 * continue with the next job, but usually the jobs
1973 * depend on each other or are similar enough to
1974 * fail for the same reason.
1976 * At the moment our pcrs expects the error codes of pcre 3.4,
1977 * but newer pcre versions can return additional error codes.
1978 * As a result pcrs_strerror()'s error message might be
1979 * "Unknown error ...", therefore we print the numerical value
1982 * XXX: Is this important enough for LOG_LEVEL_ERROR or
1983 * should we use LOG_LEVEL_RE_FILTER instead?
1985 log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
1986 b->name, job_number, pcrs_strerror(job_hits), job_hits);
1991 if (b->dynamic) pcrs_free_joblist(joblist);
1993 log_error(LOG_LEVEL_RE_FILTER,
1994 "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
1995 csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
1997 hits += current_hits;
2004 * If there were no hits, destroy our copy and let
2005 * chat() use the original in csp->iob
2013 csp->flags |= CSP_FLAG_MODIFIED;
2014 csp->content_length = size;
2022 /*********************************************************************
2024 * Function : gif_deanimate_response
2026 * Description : Deanimate the GIF image that has been accumulated in
2027 * csp->iob->buf, set csp->content_length to the modified
2028 * size and raise the CSP_FLAG_MODIFIED flag.
2031 * 1 : csp = Current client state (buffers, headers, etc...)
2033 * Returns : a pointer to the (newly allocated) modified buffer.
2034 * or NULL in case something went wrong.
2036 *********************************************************************/
2037 static char *gif_deanimate_response(struct client_state *csp)
2039 struct binbuffer *in, *out;
2043 size = (size_t)(csp->iob->eod - csp->iob->cur);
2045 if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
2046 || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
2048 log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
2052 in->buffer = csp->iob->cur;
2055 if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
2057 log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
2064 if ((int)size == out->offset)
2066 log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
2070 log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
2072 csp->content_length = out->offset;
2073 csp->flags |= CSP_FLAG_MODIFIED;
2083 /*********************************************************************
2085 * Function : get_filter_function
2087 * Description : Decides which content filter function has
2088 * to be applied (if any).
2091 * 1 : csp = Current client state (buffers, headers, etc...)
2093 * Returns : The content filter function to run, or
2094 * NULL if no content filter is active
2096 *********************************************************************/
2097 filter_function_ptr get_filter_function(struct client_state *csp)
2099 filter_function_ptr filter_function = NULL;
2102 * Are we enabling text mode by force?
2104 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
2107 * Do we really have to?
2109 if (csp->content_type & CT_TEXT)
2111 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
2115 csp->content_type |= CT_TEXT;
2116 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
2120 if (!(csp->content_type & CT_DECLARED))
2123 * The server didn't bother to declare a MIME-Type.
2124 * Assume it's text that can be filtered.
2126 * This also regulary happens with 304 responses,
2127 * therefore logging anything here would cause
2130 csp->content_type |= CT_TEXT;
2134 * Choose the applying filter function based on
2135 * the content type and action settings.
2137 if ((csp->content_type & CT_TEXT) &&
2138 (csp->rlist != NULL) &&
2139 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
2141 filter_function = pcrs_filter_response;
2143 else if ((csp->content_type & CT_GIF) &&
2144 (csp->action->flags & ACTION_DEANIMATE))
2146 filter_function = gif_deanimate_response;
2149 return filter_function;
2153 /*********************************************************************
2155 * Function : remove_chunked_transfer_coding
2157 * Description : In-situ remove the "chunked" transfer coding as defined
2158 * in rfc2616 from a buffer.
2161 * 1 : buffer = Pointer to the text buffer
2162 * 2 : size = In: Number of bytes to be processed,
2163 * Out: Number of bytes after de-chunking.
2164 * (undefined in case of errors)
2166 * Returns : JB_ERR_OK for success,
2167 * JB_ERR_PARSE otherwise
2169 *********************************************************************/
2170 static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
2173 unsigned int chunksize = 0;
2174 char *from_p, *to_p;
2177 from_p = to_p = buffer;
2179 if (sscanf(buffer, "%x", &chunksize) != 1)
2181 log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
2182 return JB_ERR_PARSE;
2185 while (chunksize > 0)
2187 if (NULL == (from_p = strstr(from_p, "\r\n")))
2189 log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
2190 return JB_ERR_PARSE;
2193 if ((newsize += chunksize) >= *size)
2195 log_error(LOG_LEVEL_ERROR,
2196 "Chunk size %d exceeds buffer size %d in \"chunked\" transfer coding",
2198 return JB_ERR_PARSE;
2202 memmove(to_p, from_p, (size_t) chunksize);
2203 to_p = buffer + newsize;
2204 from_p += chunksize + 2;
2206 if (sscanf(from_p, "%x", &chunksize) != 1)
2208 log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
2213 /* XXX: Should get its own loglevel. */
2214 log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
2223 /*********************************************************************
2225 * Function : prepare_for_filtering
2227 * Description : If necessary, de-chunks and decompresses
2228 * the content so it can get filterd.
2231 * 1 : csp = Current client state (buffers, headers, etc...)
2233 * Returns : JB_ERR_OK for success,
2234 * JB_ERR_PARSE otherwise
2236 *********************************************************************/
2237 static jb_err prepare_for_filtering(struct client_state *csp)
2239 jb_err err = JB_ERR_OK;
2242 * If the body has a "chunked" transfer-encoding,
2243 * get rid of it, adjusting size and iob->eod
2245 if (csp->flags & CSP_FLAG_CHUNKED)
2247 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
2249 log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
2250 err = remove_chunked_transfer_coding(csp->iob->cur, &size);
2251 if (JB_ERR_OK == err)
2253 csp->iob->eod = csp->iob->cur + size;
2254 csp->flags |= CSP_FLAG_MODIFIED;
2258 return JB_ERR_PARSE;
2264 * If the body has a supported transfer-encoding,
2265 * decompress it, adjusting size and iob->eod.
2267 if (csp->content_type & (CT_GZIP|CT_DEFLATE))
2269 if (0 == csp->iob->eod - csp->iob->cur)
2271 /* Nothing left after de-chunking. */
2275 err = decompress_iob(csp);
2277 if (JB_ERR_OK == err)
2279 csp->flags |= CSP_FLAG_MODIFIED;
2280 csp->content_type &= ~CT_TABOO;
2285 * Unset CT_GZIP and CT_DEFLATE to remember not
2286 * to modify the Content-Encoding header later.
2288 csp->content_type &= ~CT_GZIP;
2289 csp->content_type &= ~CT_DEFLATE;
2298 /*********************************************************************
2300 * Function : execute_content_filter
2302 * Description : Executes a given content filter.
2305 * 1 : csp = Current client state (buffers, headers, etc...)
2306 * 2 : content_filter = The filter function to execute
2308 * Returns : Pointer to the modified buffer, or
2309 * NULL if filtering failed or wasn't necessary.
2311 *********************************************************************/
2312 char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
2314 if (0 == csp->iob->eod - csp->iob->cur)
2317 * No content (probably status code 301, 302 ...),
2318 * no filtering necessary.
2323 if (JB_ERR_OK != prepare_for_filtering(csp))
2326 * failed to de-chunk or decompress.
2331 if (0 == csp->iob->eod - csp->iob->cur)
2334 * Clown alarm: chunked and/or compressed nothing delivered.
2339 return ((*content_filter)(csp));
2343 /*********************************************************************
2345 * Function : get_url_actions
2347 * Description : Gets the actions for this URL.
2350 * 1 : csp = Current client state (buffers, headers, etc...)
2351 * 2 : http = http_request request for blocked URLs
2355 *********************************************************************/
2356 void get_url_actions(struct client_state *csp, struct http_request *http)
2358 struct file_list *fl;
2359 struct url_actions *b;
2362 init_current_action(csp->action);
2364 for (i = 0; i < MAX_AF_FILES; i++)
2366 if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
2371 apply_url_actions(csp->action, http, b);
2378 /*********************************************************************
2380 * Function : apply_url_actions
2382 * Description : Applies a list of URL actions.
2385 * 1 : action = Destination.
2386 * 2 : http = Current URL
2387 * 3 : b = list of URL actions to apply
2391 *********************************************************************/
2392 void apply_url_actions(struct current_action_spec *action,
2393 struct http_request *http,
2394 struct url_actions *b)
2398 /* Should never happen */
2402 for (b = b->next; NULL != b; b = b->next)
2404 if (url_match(b->url, http))
2406 merge_current_action(action, b->action);
2412 /*********************************************************************
2414 * Function : get_forward_override_settings
2416 * Description : Returns forward settings as specified with the
2417 * forward-override{} action. forward-override accepts
2418 * forward lines similar to the one used in the
2419 * configuration file, but without the URL pattern.
2425 * in the configuration file can be replaced with
2426 * the action section:
2428 * {+forward-override{forward .}}
2432 * 1 : csp = Current client state (buffers, headers, etc...)
2434 * Returns : Pointer to forwarding structure in case of success.
2435 * Invalid syntax is fatal.
2437 *********************************************************************/
2438 const static struct forward_spec *get_forward_override_settings(struct client_state *csp)
2440 const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
2441 char forward_settings[BUFFER_SIZE];
2442 char *http_parent = NULL;
2443 /* variable names were chosen for consistency reasons. */
2444 struct forward_spec *fwd = NULL;
2448 assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
2449 /* Should be enforced by load_one_actions_file() */
2450 assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
2452 /* Create a copy ssplit can modify */
2453 strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
2455 if (NULL != csp->fwd)
2458 * XXX: Currently necessary to prevent memory
2459 * leaks when the show-url-info cgi page is visited.
2461 unload_forward_spec(csp->fwd);
2465 * allocate a new forward node, valid only for
2466 * the lifetime of this request. Save its location
2467 * in csp as well, so sweep() can free it later on.
2469 fwd = csp->fwd = zalloc(sizeof(*fwd));
2472 log_error(LOG_LEVEL_FATAL,
2473 "can't allocate memory for forward-override{%s}", forward_override_line);
2474 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2477 vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
2478 if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
2480 fwd->type = SOCKS_NONE;
2482 /* Parse the parent HTTP proxy host:port */
2483 http_parent = vec[1];
2486 else if (vec_count == 3)
2488 char *socks_proxy = NULL;
2490 if (!strcasecmp(vec[0], "forward-socks4"))
2492 fwd->type = SOCKS_4;
2493 socks_proxy = vec[1];
2495 else if (!strcasecmp(vec[0], "forward-socks4a"))
2497 fwd->type = SOCKS_4A;
2498 socks_proxy = vec[1];
2500 else if (!strcasecmp(vec[0], "forward-socks5"))
2502 fwd->type = SOCKS_5;
2503 socks_proxy = vec[1];
2506 if (NULL != socks_proxy)
2508 /* Parse the SOCKS proxy host[:port] */
2509 fwd->gateway_host = strdup(socks_proxy);
2511 if (NULL != (socks_proxy = strchr(fwd->gateway_host, ':')))
2513 *socks_proxy++ = '\0';
2514 fwd->gateway_port = strtol(socks_proxy, NULL, 0);
2517 if (fwd->gateway_port <= 0)
2519 fwd->gateway_port = 1080;
2522 http_parent = vec[2];
2526 if (NULL == http_parent)
2528 log_error(LOG_LEVEL_FATAL,
2529 "Invalid forward-override syntax in: %s", forward_override_line);
2530 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2533 /* Parse http forwarding settings */
2534 if (strcmp(http_parent, ".") != 0)
2536 fwd->forward_host = strdup(http_parent);
2538 if (NULL != (http_parent = strchr(fwd->forward_host, ':')))
2540 *http_parent++ = '\0';
2541 fwd->forward_port = strtol(http_parent, NULL, 0);
2544 if (fwd->forward_port <= 0)
2546 fwd->forward_port = 8000;
2550 assert (NULL != fwd);
2552 log_error(LOG_LEVEL_CONNECT,
2553 "Overriding forwarding settings based on \'%s\'", forward_override_line);
2559 /*********************************************************************
2561 * Function : forward_url
2563 * Description : Should we forward this to another proxy?
2566 * 1 : csp = Current client state (buffers, headers, etc...)
2567 * 2 : http = http_request request for current URL
2569 * Returns : Pointer to forwarding information.
2571 *********************************************************************/
2572 const struct forward_spec *forward_url(struct client_state *csp,
2573 const struct http_request *http)
2575 static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
2576 struct forward_spec *fwd = csp->config->forward;
2578 if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
2580 return get_forward_override_settings(csp);
2590 if (url_match(fwd->url, http))
2601 /*********************************************************************
2603 * Function : direct_response
2605 * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
2606 * request and if so, return a HTTP 501 to the client.
2608 * FIXME: I have a stupid name and I should handle the
2609 * requests properly. Still, what we do here is rfc-
2610 * compliant, whereas ignoring or forwarding are not.
2613 * 1 : csp = Current client state (buffers, headers, etc...)
2615 * Returns : http_response if , NULL if nonmatch or handler fail
2617 *********************************************************************/
2618 struct http_response *direct_response(struct client_state *csp)
2620 struct http_response *rsp;
2621 struct list_entry *p;
2623 if ((0 == strcmpic(csp->http->gpc, "trace"))
2624 || (0 == strcmpic(csp->http->gpc, "options")))
2626 for (p = csp->headers->first; (p != NULL) ; p = p->next)
2628 if (!strncmpic("Max-Forwards:", p->str, 13))
2630 unsigned int max_forwards;
2633 * If it's a Max-Forwards value of zero,
2634 * we have to intercept the request.
2636 if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
2639 * FIXME: We could handle at least TRACE here,
2640 * but that would require a verbatim copy of
2641 * the request which we don't have anymore
2643 log_error(LOG_LEVEL_HEADER,
2644 "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
2647 /* Get mem for response or fail*/
2648 if (NULL == (rsp = alloc_http_response()))
2650 return cgi_error_memory();
2653 if (NULL == (rsp->status = strdup("501 Not Implemented")))
2655 free_http_response(rsp);
2656 return cgi_error_memory();
2660 rsp->reason = RSP_REASON_UNSUPPORTED;
2662 return(finish_http_response(csp, rsp));
2671 /*********************************************************************
2673 * Function : content_filters_enabled
2675 * Description : Checks whether there are any content filters
2676 * enabled for the current request.
2679 * 1 : action = Action spec to check.
2681 * Returns : TRUE for yes, FALSE otherwise
2683 *********************************************************************/
2684 int content_filters_enabled(const struct current_action_spec *action)
2686 return ((action->flags & ACTION_DEANIMATE) ||
2687 !list_is_empty(action->multi[ACTION_MULTI_FILTER]));