1 const char jcc_rcs[] = "$Id: jcc.c,v 1.121 2007/01/27 10:52:56 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/jcc.c,v $
6 * Purpose : Main file. Contains main() method, main loop, and
7 * the main connection-handling function.
9 * Copyright : Written by and Copyright (C) 2001-2007 the SourceForge
10 * Privoxy team. http://www.privoxy.org/
12 * Based on the Internet Junkbuster originally written
13 * by and Copyright (C) 1997 Anonymous Coders and
14 * Junkbusters Corporation. http://www.junkbusters.com
16 * This program is free software; you can redistribute it
17 * and/or modify it under the terms of the GNU General
18 * Public License as published by the Free Software
19 * Foundation; either version 2 of the License, or (at
20 * your option) any later version.
22 * This program is distributed in the hope that it will
23 * be useful, but WITHOUT ANY WARRANTY; without even the
24 * implied warranty of MERCHANTABILITY or FITNESS FOR A
25 * PARTICULAR PURPOSE. See the GNU General Public
26 * License for more details.
28 * The GNU General Public License should be included with
29 * this file. If not, you can view it at
30 * http://www.gnu.org/copyleft/gpl.html
31 * or write to the Free Software Foundation, Inc., 59
32 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
37 * Move mutex initialization into separate
38 * function and exit in case of errors.
40 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
41 * - Start to reduce chat()'s line count and move
42 * parts of it into separate functions.
43 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
45 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
46 * - Add Proxy-Agent header to HTTP snippets that are
47 * supposed to reach HTTP clients only.
48 * - Made a few CONNECT log messages more descriptive.
49 * - Catch completely empty server responses (as seen
50 * with Tor's fake ".noconnect" top level domain).
51 * - Use shiny new "forwarding-failed" template for socks errors.
53 * Revision 1.118 2007/01/07 07:43:43 joergs
54 * AmigaOS4 support added.
56 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
57 * Added config option accept-intercepted-requests
58 * and disabled it by default.
60 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
61 * Reverted parts of my last commit
62 * to keep error handling working.
64 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
65 * Fixed gcc43 conversion warnings.
67 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
68 * Fix -pedantic ISO C warning about converting
69 * from function pointer to object pointer.
71 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
72 * Silence compiler warning I introduced with my last commit.
74 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
75 * Mutex protect rand() if POSIX threading
76 * is used, warn the user if that's not possible
77 * and stop using it on _WIN32 where it could
80 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
81 * Don't prevent core dumps by catching SIGABRT.
82 * It's rude and makes debugging unreasonable painful.
84 * Revision 1.110 2006/12/13 14:52:53 etresoft
85 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
87 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
88 * Privoxy is now able to run as intercepting
89 * proxy in combination with any packet filter
90 * that does the port redirection. The destination
91 * is extracted from the "Host:" header which
92 * should be available for nearly all requests.
94 * Moved HTTP snipplets into jcc.c.
95 * Added error message for gopher proxy requests.
97 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
98 * Only unlink the pidfile if it's actually used.
100 * Change order of interception checks to make
101 * it possible to block or redirect requests for
104 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
105 * Make pthread mutex locking more generic. Instead of
106 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
107 * and use mutex locking unless there is an _r function
108 * available. Better safe than sorry.
110 * Fixes "./configure --disable-pthread" and should result
111 * in less threading-related problems on pthread-using platforms,
112 * but it still doesn't fix BR#1122404.
114 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
115 * Move pthread.h inclusion from jcc.c to jcc.h.
116 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
118 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
119 * Don't exit after receiving the second SIGHUP on Solaris.
121 * Fixes BR 1052235, but the same problem may exist on other
122 * systems. Once 3.0.6 is out we should use sigset()
123 * where available and see if it breaks anything.
125 * Revision 1.104 2006/09/23 13:26:38 roro
126 * Replace TABs by spaces in source code.
128 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
129 * Fix +redirect{}. Didn't work with -fast-redirects.
131 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
132 * Respond with 400 and a short text message
133 * if the client tries to use Privoxy as FTP proxy.
135 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
136 * Make number of retries in case of forwarded-connect problems
137 * a config file option (forwarded-connect-retries) and use 0 as
140 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
141 * Set random(3) seed.
143 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
144 * Follow the OpenBSD port's lead and protect the resolve
145 * functions on OpenBSD as well.
147 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
148 * --user fix. Only use the user as group if no group is specified.
149 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
151 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
152 * Windows service (re-)integration
156 * --install[:service_name]
157 * --uninstall[:service_name]
160 * They work as follows:
161 * --install will create a service for you and then terminate.
162 * By default the service name will be "privoxy" (without the quotes).
163 * However you can run multiple services if you wish, just by adding
164 * a colon and then a name (no spaces).
166 * --uninstall follows the exact same rules a --install.
168 * --service is used when the program is executed by the service
169 * control manager, and in normal circumstances would never be
170 * used as a command line argument.
172 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
173 * Windows service integration
175 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
176 * Incorporate Fabian Keil's patch work:
177 http://www.fabiankeil.de/sourcecode/privoxy/
179 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
180 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
181 * with what was really the latest development (the v_3_0_branch branch)
183 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
184 * Thanks to Jindrich Makovicka for a race condition fix for the log
185 * file. The race condition remains for non-pthread implementations.
186 * Reference patch #1175720.
188 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
189 * Add the ability to check jpeg images for invalid
190 * lengths of comment blocks. Defensive strategy
191 * against the exploit:
192 * Microsoft Security Bulletin MS04-028
193 * Buffer Overrun in JPEG Processing (GDI+) Could
194 * Allow Code Execution (833987)
195 * Enabled with +inspect-jpegs in actions files.
197 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
198 * - Fixed usage info for non-unix platforms
199 * - Fixed small cmdline parsing bug
201 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
202 * Diagnostics: Now preserve the returncode of pthread_create
203 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
205 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
206 * No longer ignore SIGCHLD. Fixes bug #769381
208 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
209 * Close jarfile on graceful exit, remove stray line
211 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
212 * Cosmetics: Killed a warning, a typo and an allocation left at exit
214 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
215 * No longer rely on non-POSIX.1 extensions of getcwd().
218 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
219 * Replaced setenv() by posix-compliant putenv()
220 * Thanks to Neil McCalden (nmcc AT users.sf.net).
222 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
223 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
225 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
226 * Clean-up and extension of improvements for forked mode:
227 * - Child's return code now consists of flags RC_FLAG_*
228 * - Reporting toggle to parent now properly #ifdef'ed
229 * - Children now report blocking to parent. This enables
230 * statistics in forked mode
232 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
233 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
234 * Children now report having been toggled through _exit(17), parents
235 * watch for that code and toggle themselves if found.
237 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
238 * Wrapping all *_r functions (the non-_r versions of them) with
239 * mutex semaphores for OSX. Hopefully this will take care of all
240 * of those pesky crash reports.
242 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
243 * Fixed two mostly harmless mem leaks
245 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
246 * Fix: Head of global clients list now initialized to NULL
248 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
249 * Added basic support for OPTIONS and TRACE HTTP methods:
250 * - New interceptor direct_response() added in chat().
251 * - sed() moved to earlier in the process, so that the
252 * Host: header is evaluated before actions and forwarding
255 * Revision 1.92 2002/05/08 16:00:46 oes
256 * Chat's buffer handling:
257 * - Fixed bug with unchecked out-of-mem conditions
258 * while reading client request & server headers
259 * - No longer predict if the buffer limit will be exceeded
260 * in the next read -- check add_to_iob's new
261 * return code. If buffer couldn't be extended
262 * (policy or out-of-mem) while
263 * - reading from client: abort
264 * - reading server headers: send error page
265 * - buffering server body for filter: flush,
266 * and if that fails: send error page
268 * Revision 1.91 2002/04/08 20:35:58 swa
271 * Revision 1.90 2002/04/02 14:57:28 oes
272 * Made sending wafers independent of FEATURE_COOKIE_JAR
274 * Revision 1.89 2002/03/31 17:18:59 jongfoster
275 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
277 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
278 * More compiler warning message maintenance
280 * Revision 1.87 2002/03/26 22:29:54 swa
281 * we have a new homepage!
283 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
284 * Workaround for closing the jarfile before load_config() comes around again
286 * Revision 1.85 2002/03/24 15:23:33 jongfoster
289 * Revision 1.84 2002/03/24 13:25:43 swa
290 * name change related issues
292 * Revision 1.83 2002/03/16 23:54:06 jongfoster
293 * Adding graceful termination feature, to help look for memory leaks.
294 * If you enable this (which, by design, has to be done by hand
295 * editing config.h) and then go to http://i.j.b/die, then the program
296 * will exit cleanly after the *next* request. It should free all the
297 * memory that was used.
299 * Revision 1.82 2002/03/13 00:27:05 jongfoster
302 * Revision 1.81 2002/03/12 01:42:50 oes
303 * Introduced modular filters
305 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
306 * OS/2 port maintenance:
307 * - Fixed EMX build - it had decayed a little
308 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
309 * substituted a memset for now.
311 * Revision 1.79 2002/03/09 20:03:52 jongfoster
312 * - Making various functions return int rather than size_t.
313 * (Undoing a recent change). Since size_t is unsigned on
314 * Windows, functions like read_socket that return -1 on
315 * error cannot return a size_t.
317 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
318 * crashes, and also frequently caused JB to jump to 100%
319 * CPU and stay there. (Because it thought it had just
320 * read ((unsigned)-1) == 4Gb of data...)
322 * - The signature of write_socket has changed, it now simply
323 * returns success=0/failure=nonzero.
325 * - Trying to get rid of a few warnings --with-debug on
326 * Windows, I've introduced a new type "jb_socket". This is
327 * used for the socket file descriptors. On Windows, this
328 * is SOCKET (a typedef for unsigned). Everywhere else, it's
329 * an int. The error value can't be -1 any more, so it's
330 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
331 * Windows it maps to the #define INVALID_SOCKET.)
333 * - The signature of bind_port has changed.
335 * Revision 1.78 2002/03/08 21:35:04 oes
336 * Added optional group supplement to --user option. Will now use default group of user if no group given
338 * Revision 1.77 2002/03/07 03:52:06 oes
339 * - Fixed compiler warnings etc
340 * - Improved handling of failed DNS lookups
342 * Revision 1.76 2002/03/06 22:54:35 jongfoster
343 * Automated function-comment nitpicking.
345 * Revision 1.75 2002/03/06 10:02:19 oes
346 * Fixed stupid bug when --user was not given
348 * Revision 1.74 2002/03/06 00:49:31 jongfoster
349 * Fixing warning on Windows
350 * Making #ifdefs that refer to the same variable consistently
351 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
353 * Revision 1.73 2002/03/05 23:57:30 hal9
354 * Stray character 's' on line 1618 was breaking build.
356 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
357 * - Re-enable OS/2 building after new parms were added
358 * - Fix false out of memory report when resolving CGI templates when no IP
359 * address is available of failed attempt (a la no such domain)
361 * Revision 1.71 2002/03/05 18:13:56 oes
362 * Added --user option
364 * Revision 1.70 2002/03/05 04:52:42 oes
365 * Deleted non-errlog debugging code
367 * Revision 1.69 2002/03/04 23:50:00 jongfoster
368 * Splitting off bind_port() call into bind_port_helper(), with
371 * Revision 1.68 2002/03/04 20:17:32 oes
374 * Revision 1.67 2002/03/04 18:18:57 oes
375 * - Removed _DEBUG mode
376 * - Cleand up cmdline parsing
377 * - Introduced --no-daemon, --pidfile options
378 * - Cleaned up signal handling:
379 * - Terminate cleanly on INT, TERM and ABRT
380 * - Schedule logfile for re-opening on HUP
381 * - Ignore CHLD and PIPE
382 * - Leave the rest with their default handlers
383 * - Uniform handler registration
384 * - Added usage() function
385 * - Played styleguide police
387 * Revision 1.66 2002/03/03 15:06:55 oes
388 * Re-enabled automatic config reloading
390 * Revision 1.65 2002/03/03 14:49:11 oes
391 * Fixed CLF logging: Now uses client's original HTTP request
393 * Revision 1.64 2002/03/03 09:18:03 joergs
394 * Made jumbjuster work on AmigaOS again.
396 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
397 * Clean up a little CRLF unpleasantness that suddenly appeared
399 * Revision 1.62 2002/02/20 23:17:23 jongfoster
400 * Detecting some out-of memory conditions and exiting with a log message.
402 * Revision 1.61 2002/01/17 21:01:52 jongfoster
403 * Moving all our URL and URL pattern parsing code to urlmatch.c.
405 * Revision 1.60 2001/12/30 14:07:32 steudten
406 * - Add signal handling (unix)
407 * - Add SIGHUP handler (unix)
408 * - Add creation of pidfile (unix)
409 * - Add action 'top' in rc file (RH)
410 * - Add entry 'SIGNALS' to manpage
411 * - Add exit message to logfile (unix)
413 * Revision 1.59 2001/12/13 14:07:18 oes
414 * Fixed Bug: 503 error page now sent OK
416 * Revision 1.58 2001/11/30 23:37:24 jongfoster
417 * Renaming the Win32 config file to config.txt - this is almost the
418 * same as the corresponding UNIX name "config"
420 * Revision 1.57 2001/11/16 00:47:43 jongfoster
421 * Changing the tty-disconnection code to use setsid().
423 * Revision 1.56 2001/11/13 20:20:54 jongfoster
424 * Tabs->spaces, fixing a bug with missing {} around an if()
426 * Revision 1.55 2001/11/13 20:14:53 jongfoster
427 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
429 * Revision 1.54 2001/11/07 00:03:14 steudten
430 * Give reliable return value if an error
431 * occurs not just 0 with new daemon mode.
433 * Revision 1.53 2001/11/05 21:41:43 steudten
434 * Add changes to be a real daemon just for unix os.
435 * (change cwd to /, detach from controlling tty, set
436 * process group and session leader to the own process.
438 * Add some fatal-error log message for failed malloc().
439 * Add '-d' if compiled with 'configure --with-debug' to
440 * enable debug output.
442 * Revision 1.52 2001/10/26 20:11:20 jongfoster
443 * Fixing type mismatch
445 * Revision 1.51 2001/10/26 17:38:28 oes
448 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
449 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
450 * threads to call select() simultaneously. So, it's time to do a real, live,
451 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
452 * (native). Both versions will work, but using __OS2__ offers multi-threading.
454 * Revision 1.49 2001/10/23 21:41:35 jongfoster
455 * Added call to initialize the (statically-allocated of course)
456 * "out of memory" CGI response.
458 * Revision 1.48 2001/10/10 19:56:46 jongfoster
459 * Moving some code that wasn't cookie-related out of an #ifdef
462 * Revision 1.47 2001/10/10 16:44:36 oes
463 * Added CONNECT destination port limitation check
465 * Revision 1.46 2001/10/08 15:17:41 oes
466 * Re-enabled SSL forwarding
468 * Revision 1.45 2001/10/07 15:42:11 oes
469 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
471 * Moved downgrading of the HTTP version from parse_http_request to
472 * chat(), since we can't decide if it is necessary before we have
473 * determined the actions for the URL. The HTTP command is now
474 * *always* re-built so the repairs need no longer be special-cased.
476 * filter_popups now gets a csp pointer so it can raise the new
477 * CSP_FLAG_MODIFIED flag.
481 * Added configurable size limit for the IOB. If the IOB grows so
482 * large that the next read would exceed the limit, the header
483 * is generated, and the header & unfiltered buffer are flushed
484 * to the client. Chat then continues in non-buffering,
485 * non-filtering body mode.
487 * Revision 1.44 2001/10/02 18:13:57 oes
490 * Revision 1.43 2001/10/02 15:32:13 oes
491 * Moved generation of hdr
493 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
494 * Cleaning up 2 compiler warnings on OS/2.
496 * Revision 1.41 2001/09/16 17:05:14 jongfoster
497 * Removing unused #include showarg.h
499 * Revision 1.40 2001/09/16 15:41:45 jongfoster
500 * Fixing signed/unsigned comparison warning.
502 * Revision 1.39 2001/09/16 13:21:27 jongfoster
503 * Changes to use new list functions.
505 * Revision 1.38 2001/09/16 13:01:46 jongfoster
506 * Removing redundant function call that zeroed zalloc()'d memory.
508 * Revision 1.37 2001/09/10 11:12:24 oes
509 * Deleted unused variable
511 * Revision 1.36 2001/09/10 10:56:15 oes
512 * Silenced compiler warnings
514 * Revision 1.35 2001/07/31 14:44:22 oes
515 * Deleted unused size parameter from filter_popups()
517 * Revision 1.34 2001/07/30 22:08:36 jongfoster
518 * Tidying up #defines:
519 * - All feature #defines are now of the form FEATURE_xxx
520 * - Permanently turned off WIN_GUI_EDIT
521 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
523 * Revision 1.33 2001/07/29 19:32:00 jongfoster
524 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
526 * Revision 1.32 2001/07/29 18:47:05 jongfoster
527 * Adding missing #include "loadcfg.h"
529 * Revision 1.31 2001/07/29 12:17:48 oes
530 * Applied pthread fix by Paul Lieverse
532 * Revision 1.30 2001/07/25 22:57:13 jongfoster
533 * __BEOS__ no longer overrides FEATURE_PTHREAD.
534 * This is because FEATURE_PTHREAD will soon be widely used, so I
535 * want to keep it simple.
537 * Revision 1.29 2001/07/24 12:47:06 oes
538 * Applied BeOS support update by Eugenia
540 * Revision 1.28 2001/07/23 13:26:12 oes
541 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
543 * Revision 1.27 2001/07/19 19:09:47 haroon
544 * - Added code to take care of the situation where while processing the first
545 * server response (which includes the server header), after finding the end
546 * of the headers we were not looking past the end of the headers for
547 * content modification. I enabled it for filter_popups.
548 * Someone else should look to see if other similar operations should be
549 * done to the discarded portion of the buffer.
551 * Note 2001/07/20: No, the other content modification mechanisms will process
552 * the whole iob later anyway. --oes
554 * Revision 1.26 2001/07/18 12:31:36 oes
557 * Revision 1.25 2001/07/15 19:43:49 jongfoster
558 * Supports POSIX threads.
559 * Also removed some unused #includes.
561 * Revision 1.24 2001/07/13 14:00:40 oes
562 * - Generic content modification scheme:
563 * Each feature has its own applicability flag that is set
564 * from csp->action->flags.
565 * Replaced the "filtering" int flag , by a function pointer
566 * "content_filter" to the function that will do the content
567 * modification. If it is != NULL, the document will be buffered
568 * and processed through *content_filter, which must set
569 * csp->content_length and return a modified copy of the body
570 * or return NULL (on failiure).
571 * - Changed csp->is_text to the more generic bitmap csp->content_type
572 * which can currently take the valued CT_TEXT or CT_GIF
574 * - Removed all #ifdef PCRS
576 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
577 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
578 * the `block_acl' call. This prevents a compilation error when the user
579 * does not wish to use the "ACL" feature.
581 * Revision 1.22 2001/06/29 21:45:41 oes
582 * Indentation, CRLF->LF, Tab-> Space
584 * Revision 1.21 2001/06/29 13:29:36 oes
585 * - Cleaned up, improved comments
586 * - Unified all possible interceptors (CGI,
587 * block, trust, fast_redirect) in one
588 * place, with one (CGI) answer generation
589 * mechansim. Much clearer now.
590 * - Removed the GIF image generation, which
591 * is now done in filters.c:block_url()
592 * - Made error conditions like domain lookup
593 * failiure or (various) problems while talking
594 * to the server use cgi.c:error_response()
595 * instead of generating HTML/HTTP in chat() (yuck!)
596 * - Removed logentry from cancelled commit
598 * Revision 1.20 2001/06/09 10:55:28 jongfoster
599 * Changing BUFSIZ ==> BUFFER_SIZE
601 * Revision 1.19 2001/06/07 23:12:52 jongfoster
602 * Replacing function pointer in struct gateway with a directly
603 * called function forwarded_connect().
604 * Replacing struct gateway with struct forward_spec
606 * Revision 1.18 2001/06/03 19:12:16 oes
607 * introduced new cgi handling
609 * Revision 1.17 2001/06/01 20:07:23 jongfoster
610 * Now uses action +image-blocker{} rather than config->tinygif
612 * Revision 1.16 2001/06/01 18:49:17 jongfoster
613 * Replaced "list_share" with "list" - the tiny memory gain was not
614 * worth the extra complexity.
616 * Revision 1.15 2001/05/31 21:24:47 jongfoster
617 * Changed "permission" to "action" throughout.
618 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
619 * Moved vanilla wafer check into chat(), since we must now
620 * decide whether or not to add it based on the URL.
622 * Revision 1.14 2001/05/29 20:14:01 joergs
623 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
626 * Revision 1.13 2001/05/29 09:50:24 jongfoster
627 * Unified blocklist/imagelist/permissionslist.
628 * File format is still under discussion, but the internal changes
631 * Also modified interceptor behaviour:
632 * - We now intercept all URLs beginning with one of the following
633 * prefixes (and *only* these prefixes):
635 * * http://ijbswa.sf.net/config/
636 * * http://ijbswa.sourceforge.net/config/
637 * - New interceptors "home page" - go to http://i.j.b/ to see it.
638 * - Internal changes so that intercepted and fast redirect pages
639 * are not replaced with an image.
640 * - Interceptors now have the option to send a binary page direct
641 * to the client. (i.e. ijb-send-banner uses this)
642 * - Implemented show-url-info interceptor. (Which is why I needed
643 * the above interceptors changes - a typical URL is
644 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
645 * The previous mechanism would not have intercepted that, and
646 * if it had been intercepted then it then it would have replaced
649 * Revision 1.12 2001/05/27 22:17:04 oes
651 * - re_process_buffer no longer writes the modified buffer
652 * to the client, which was very ugly. It now returns the
653 * buffer, which it is then written by chat.
655 * - content_length now adjusts the Content-Length: header
656 * for modified documents rather than crunch()ing it.
657 * (Length info in csp->content_length, which is 0 for
658 * unmodified documents)
660 * - For this to work, sed() is called twice when filtering.
662 * Revision 1.11 2001/05/26 17:27:53 jongfoster
663 * Added support for CLF and fixed LOG_LEVEL_LOG.
664 * Also did CRLF->LF fix of my previous patch.
666 * Revision 1.10 2001/05/26 15:26:15 jongfoster
667 * ACL feature now provides more security by immediately dropping
668 * connections from untrusted hosts.
670 * Revision 1.9 2001/05/26 00:28:36 jongfoster
671 * Automatic reloading of config file.
672 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
673 * Most of the global variables have been moved to a new
674 * struct configuration_spec, accessed through csp->config->globalname
675 * Most of the globals remaining are used by the Win32 GUI.
677 * Revision 1.8 2001/05/25 22:43:18 jongfoster
678 * Fixing minor memory leak and buffer overflow.
680 * Revision 1.7 2001/05/25 22:34:30 jongfoster
683 * Revision 1.6 2001/05/23 00:13:58 joergs
684 * AmigaOS support fixed.
686 * Revision 1.5 2001/05/22 18:46:04 oes
688 * - Enabled filtering banners by size rather than URL
689 * by adding patterns that replace all standard banner
690 * sizes with the "Junkbuster" gif to the re_filterfile
692 * - Enabled filtering WebBugs by providing a pattern
693 * which kills all 1x1 images
695 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
696 * which is selected by the (nonstandard and therefore
697 * capital) letter 'U' in the option string.
698 * It causes the quantifiers to be ungreedy by default.
699 * Appending a ? turns back to greedy (!).
701 * - Added a new interceptor ijb-send-banner, which
702 * sends back the "Junkbuster" gif. Without imagelist or
703 * MSIE detection support, or if tinygif = 1, or the
704 * URL isn't recognized as an imageurl, a lame HTML
705 * explanation is sent instead.
707 * - Added new feature, which permits blocking remote
708 * script redirects and firing back a local redirect
710 * The feature is conditionally compiled, i.e. it
711 * can be disabled with --disable-fast-redirects,
712 * plus it must be activated by a "fast-redirects"
713 * line in the config file, has its own log level
714 * and of course wants to be displayed by show-proxy-args
715 * Note: Boy, all the #ifdefs in 1001 locations and
716 * all the fumbling with configure.in and acconfig.h
717 * were *way* more work than the feature itself :-(
719 * - Because a generic redirect template was needed for
720 * this, tinygif = 3 now uses the same.
722 * - Moved GIFs, and other static HTTP response templates
727 * - Removed some >400 CRs again (Jon, you really worked
730 * Revision 1.4 2001/05/21 19:34:01 jongfoster
731 * Made failure to bind() a fatal error.
733 * Revision 1.3 2001/05/20 01:21:20 jongfoster
734 * Version 2.9.4 checkin.
735 * - Merged popupfile and cookiefile, and added control over PCRS
736 * filtering, in new "permissionsfile".
737 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
738 * file error you now get a message box (in the Win32 GUI) rather
739 * than the program exiting with no explanation.
740 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
742 * - Removed tabs from "config"
743 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
744 * - Bumped up version number.
746 * Revision 1.2 2001/05/17 22:34:44 oes
747 * - Added hint on GIF char array generation to jcc.c
748 * - Cleaned CRLF's from the sources and related files
749 * - Repaired logging for REF and FRC
751 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
752 * Initial import of version 2.9.3 source tree
755 *********************************************************************/
761 #include <sys/types.h>
770 # ifndef FEATURE_PTHREAD
774 # include <windows.h>
775 # include <process.h>
776 # endif /* ndef FEATURE_PTHREAD */
779 # ifndef _WIN_CONSOLE
781 # endif /* ndef _WIN_CONSOLE */
782 # include "w32svrapi.h"
784 #else /* ifndef _WIN32 */
786 # if !defined (__OS2__)
788 # include <sys/wait.h>
789 # endif /* ndef __OS2__ */
790 # include <sys/time.h>
791 # include <sys/stat.h>
792 # include <sys/ioctl.h>
795 #include <sys/termios.h>
806 # include <socket.h> /* BeOS has select() for sockets only. */
807 # include <OS.h> /* declarations for threads and stuff. */
810 # if defined(__EMX__) || defined(__OS2__)
811 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
816 #define bzero(B,N) memset(B,0x00,n)
831 #include "killpopup.h"
832 #include "miscutil.h"
834 #include "jbsockets.h"
839 #include "urlmatch.h"
841 const char jcc_h_rcs[] = JCC_H_VERSION;
842 const char project_h_rcs[] = PROJECT_H_VERSION;
845 struct client_state clients[1];
846 struct file_list files[1];
848 #ifdef FEATURE_STATISTICS
849 int urls_read = 0; /* total nr of urls read inc rejected */
850 int urls_rejected = 0; /* total nr of urls rejected */
851 #endif /* def FEATURE_STATISTICS */
853 #ifdef FEATURE_GRACEFUL_TERMINATION
857 static void listen_loop(void);
858 static void chat(struct client_state *csp);
860 void serve(struct client_state *csp);
861 #else /* ifndef AMIGA */
862 static void serve(struct client_state *csp);
863 #endif /* def AMIGA */
866 static int32 server_thread(void *data);
867 #endif /* def __BEOS__ */
870 #define sleep(N) Sleep(((N) * 1000))
874 #define sleep(N) DosSleep(((N) * 100))
877 #ifdef FEATURE_PTHREAD
878 pthread_mutex_t log_mutex;
879 pthread_mutex_t log_init_mutex;
881 #ifndef HAVE_GMTIME_R
882 pthread_mutex_t gmtime_mutex;
883 #endif /* ndef HAVE_GMTIME_R */
885 #ifndef HAVE_LOCALTIME_R
886 pthread_mutex_t localtime_mutex;
887 #endif /* ndef HAVE_GMTIME_R */
889 #ifndef HAVE_GETHOSTBYADDR_R
890 pthread_mutex_t gethostbyaddr_mutex;
891 #endif /* ndef HAVE_GETHOSTBYADDR_R */
893 #ifndef HAVE_GETHOSTBYNAME_R
894 pthread_mutex_t gethostbyname_mutex;
895 #endif /* ndef HAVE_GETHOSTBYNAME_R */
898 pthread_mutex_t rand_mutex;
899 #endif /* ndef HAVE_RANDOM */
901 #endif /* FEATURE_PTHREAD */
903 #if defined(unix) || defined(__EMX__)
904 const char *basedir = NULL;
905 const char *pidfile = NULL;
906 int received_hup_signal = 0;
907 #endif /* defined unix */
909 /* The vanilla wafer. */
910 static const char VANILLA_WAFER[] =
911 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
912 "Do_not_send_me_any_copyrighted_information_other_than_the_"
913 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
914 "In_particular_do_not_send_me_any_cookies_that_"
915 "are_subject_to_a_claim_of_copyright_by_anybody._"
916 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
917 "(copyright_or_otherwise)_applying_to_any_cookie._";
919 /* HTTP snipplets. */
920 const char CSUCCEED[] =
921 "HTTP/1.0 200 Connection established\n"
922 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
924 const char CHEADER[] =
925 "HTTP/1.0 400 Invalid header received from browser\r\n"
926 "Connection: close\r\n\r\n"
927 "Invalid header received from browser.\r\n";
929 const char CFORBIDDEN[] =
930 "HTTP/1.0 403 Connection not allowable\r\n"
931 "Proxy-Agent: Privoxy " VERSION "\r\n"
932 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
933 "Connection: close\r\n\r\n";
935 const char FTP_RESPONSE[] =
936 "HTTP/1.0 400 Invalid request received from browser\r\n"
937 "Connection: close\r\n\r\n"
938 "Invalid request. Privoxy doesn't support FTP.\r\n";
940 const char GOPHER_RESPONSE[] =
941 "HTTP/1.0 400 Invalid request received from browser\r\n"
942 "Connection: close\r\n\r\n"
943 "Invalid request. Privoxy doesn't support gopher.\r\n";
945 /* XXX: should be a template */
946 const char MISSING_DESTINATION_RESPONSE[] =
947 "HTTP/1.0 400 Bad request received from browser\r\n"
948 "Proxy-Agent: Privoxy " VERSION "\r\n"
949 "Connection: close\r\n\r\n"
950 "Bad request. Privoxy was unable to extract the destination.\r\n";
952 /* XXX: should be a template */
953 const char NO_SERVER_DATA_RESPONSE[] =
954 "HTTP/1.0 502 Server or forwarder response empty\r\n"
955 "Proxy-Agent: Privoxy " VERSION "\r\n"
956 "Connection: close\r\n\r\n"
957 "Empty server or forwarder response.\r\n"
958 "The connection was closed without sending any data.\r\n";
960 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
961 /*********************************************************************
963 * Function : sig_handler
965 * Description : Signal handler for different signals.
966 * Exit gracefully on TERM and INT
967 * or set a flag that will cause the errlog
968 * to be reopened by the main thread on HUP.
971 * 1 : the_signal = the signal cause this function to call
975 *********************************************************************/
976 static void sig_handler(int the_signal)
982 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
993 received_hup_signal = 1;
998 * We shouldn't be here, unless we catch signals
999 * in main() that we can't handle here!
1001 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1009 /*********************************************************************
1011 * Function : client_protocol_is_unsupported
1013 * Description : Checks if the client used a known unsupported
1014 * protocol and deals with it by sending an error
1018 * 1 : csp = Current client state (buffers, headers, etc...)
1019 * 2 : req = the first request line send by the client
1021 * Returns : TRUE if an error response has been generated, or
1022 * FALSE if the request doesn't look invalid.
1024 *********************************************************************/
1025 int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1027 char buf[BUFFER_SIZE];
1030 * If it's a FTP or gopher request, we don't support it.
1032 * These checks are better than nothing, but they might
1033 * not work in all configurations and some clients might
1034 * have problems digesting the answer.
1036 * They should, however, never cause more problems than
1037 * Privoxy's old behaviour (returning the misleading HTML
1040 * "Could not resolve http://(ftp|gopher)://example.org").
1042 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1044 if (!strncmpic(req, "GET ftp://", 10))
1046 strcpy(buf, FTP_RESPONSE);
1047 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1048 csp->ip_addr_str, req);
1052 strcpy(buf, GOPHER_RESPONSE);
1053 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1054 csp->ip_addr_str, req);
1056 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1058 write_socket(csp->cfd, buf, strlen(buf));
1067 /*********************************************************************
1069 * Function : get_request_destination_elsewhere
1071 * Description : If the client's request was redirected into
1072 * Privoxy without the client's knowledge,
1073 * the request line lacks the destination host.
1075 * This function tries to get it elsewhere,
1076 * provided accept-intercepted-requests is enabled.
1078 * "Elsewhere" currently only means "Host: header",
1079 * but in the future we may ask the redirecting
1080 * packet filter to look the destination up.
1082 * If the destination stays unknown, an error
1083 * response is send to the client and headers
1084 * are freed so that chat() can return directly.
1087 * 1 : csp = Current client state (buffers, headers, etc...)
1088 * 2 : headers = a header list
1090 * Returns : JB_ERR_OK if the destination is now known, or
1091 * JB_ERR_PARSE if it isn't.
1093 *********************************************************************/
1094 jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1096 char buf[BUFFER_SIZE];
1099 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1101 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1102 " Privoxy isn't configured to accept intercepted requests.",
1103 csp->ip_addr_str, csp->http->cmd);
1104 /* XXX: Use correct size */
1105 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1106 csp->ip_addr_str, csp->http->cmd);
1108 strcpy(buf, CHEADER);
1109 write_socket(csp->cfd, buf, strlen(buf));
1110 destroy_list(headers);
1112 return JB_ERR_PARSE;
1114 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1116 /* Split the domain we just got for pattern matching */
1117 init_domain_components(csp->http);
1123 /* We can't work without destination. Go spread the news.*/
1125 req = list_to_text(headers);
1127 /* XXX: Use correct size */
1128 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1129 csp->ip_addr_str, csp->http->cmd);
1130 log_error(LOG_LEVEL_ERROR,
1131 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1132 csp->ip_addr_str, csp->http->cmd, req);
1135 strcpy(buf, MISSING_DESTINATION_RESPONSE);
1136 write_socket(csp->cfd, buf, strlen(buf));
1137 destroy_list(headers);
1139 return JB_ERR_PARSE;
1142 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1143 * to get the destination IP address, use it as host directly
1144 * or do a reverse DNS lookup first.
1149 /*********************************************************************
1151 * Function : get_server_headers
1153 * Description : Parses server headers in iob and fills them
1154 * into csp->headers so that they can later be
1158 * 1 : csp = Current client state (buffers, headers, etc...)
1160 * Returns : JB_ERR_OK if everything went fine, or
1161 * JB_ERR_PARSE if the headers were incomplete.
1163 *********************************************************************/
1164 jb_err get_server_headers(struct client_state *csp)
1166 int continue_hack_in_da_house = 0;
1169 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1174 * continue hack in da house. Ignore the ending of
1175 * this head and continue enlisting header lines.
1176 * The reason is described below.
1178 enlist(csp->headers, "");
1179 continue_hack_in_da_house = 0;
1182 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1185 * It's a bodyless continue response, don't
1186 * stop header parsing after reaching it's end.
1188 * As a result Privoxy will concatenate the
1189 * next response's head and parse and deliver
1190 * the headers as if they belonged to one request.
1192 * The client will separate them because of the
1193 * empty line between them.
1195 * XXX: What we're doing here is clearly against
1196 * the intended purpose of the continue header,
1197 * and under some conditions (HTTP/1.0 client request)
1198 * it's a standard violation.
1200 * Anyway, "sort of against the spec" is preferable
1201 * to "always getting confused by Continue responses"
1202 * (Privoxy's behaviour before this hack was added)
1204 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1205 continue_hack_in_da_house = 1;
1207 else if (*header == '\0')
1210 * If the header is empty, but the Continue hack
1211 * isn't active, we can assume that we reached the
1212 * end of the buffer before we hit the end of the
1215 * Inform the caller an let it decide how to handle it.
1217 return JB_ERR_PARSE;
1221 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1224 * XXX: Should we quit the request and return a
1225 * out of memory error page instead?
1227 log_error(LOG_LEVEL_ERROR,
1228 "Out of memory while enlisting server headers. %s lost.",
1238 /*********************************************************************
1240 * Function : crunch_reason
1242 * Description : Translates the crunch reason code into a string.
1245 * 1 : rsp = a http_response
1247 * Returns : A string with the crunch reason or an error description.
1249 *********************************************************************/
1250 const char *crunch_reason(const struct http_response *rsp)
1252 char * reason = NULL;
1254 assert(rsp != NULL);
1257 return "Internal error while searching for crunch reason";
1260 switch (rsp->reason)
1262 case RSP_REASON_UNSUPPORTED:
1263 reason = "Unsupported HTTP feature";
1265 case RSP_REASON_BLOCKED:
1268 case RSP_REASON_UNTRUSTED:
1269 reason = "Untrusted";
1271 case RSP_REASON_REDIRECTED:
1272 reason = "Redirected";
1274 case RSP_REASON_CGI_CALL:
1275 reason = "CGI Call";
1277 case RSP_REASON_NO_SUCH_DOMAIN:
1278 reason = "DNS failure";
1280 case RSP_REASON_FORWARDING_FAILED:
1281 reason = "Forwarding failed";
1283 case RSP_REASON_CONNECT_FAILED:
1284 reason = "Connection failure";
1286 case RSP_REASON_OUT_OF_MEMORY:
1287 reason = "Out of memory (may mask other reasons)";
1290 reason = "No reason recorded";
1298 /*********************************************************************
1300 * Function : send_crunch_response
1302 * Description : Delivers already prepared response for
1303 * intercepted requests, logs the interception
1304 * and frees the response.
1307 * 1 : csp = Current client state (buffers, headers, etc...)
1308 * 1 : rsp = Fully prepared response. Will be freed on exit.
1310 * Returns : Nothing.
1312 *********************************************************************/
1313 void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1315 const struct http_request *http = csp->http;
1316 char status_code[4];
1318 assert(rsp != NULL);
1319 assert(rsp->head != NULL);
1324 * Not supposed to happen. If it does
1325 * anyway, treat it as an unknown error.
1327 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1328 /* return code doesn't matter */
1333 /* If rsp is still NULL, we have serious internal problems. */
1334 log_error(LOG_LEVEL_FATAL,
1335 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1339 * Extract the status code from the actual head
1340 * that was send to the client. It is the only
1341 * way to get it right for all requests, including
1342 * the fixed ones for out-of-memory problems.
1344 * A head starts like this: 'HTTP/1.1 200...'
1348 status_code[0] = rsp->head[9];
1349 status_code[1] = rsp->head[10];
1350 status_code[2] = rsp->head[11];
1351 status_code[3] = '\0';
1353 /* Write the answer to the client */
1354 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1355 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1357 /* There is nothing we can do about it. */
1358 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1361 /* Log that the request was crunched and why. */
1362 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1363 http->hostport, http->path, crunch_reason(rsp));
1364 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1365 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1367 /* Clean up and return */
1368 if (cgi_error_memory() != rsp)
1370 free_http_response(rsp);
1376 /*********************************************************************
1380 * Description : Once a connection to the client has been accepted,
1381 * this function is called (via serve()) to handle the
1382 * main business of the communication. When this
1383 * function returns, the caller must close the client
1386 * FIXME: chat is nearly thousand lines long.
1390 * 1 : csp = Current client state (buffers, headers, etc...)
1392 * Returns : On success, the number of bytes written are returned (zero
1393 * indicates nothing was written). On error, -1 is returned,
1394 * and errno is set appropriately. If count is zero and the
1395 * file descriptor refers to a regular file, 0 will be
1396 * returned without causing any other effect. For a special
1397 * file, the results are not portable.
1399 *********************************************************************/
1400 static void chat(struct client_state *csp)
1403 * This next lines are a little ugly, but they simplifies the if statements
1404 * below. Basically if TOGGLE, then we want the if to test if the
1405 * CSP_FLAG_TOGGLED_ON flag ist set, else we don't. And if FEATURE_FORCE_LOAD,
1406 * then we want the if to test for CSP_FLAG_FORCED , else we don't
1408 #ifdef FEATURE_TOGGLE
1409 # define IS_TOGGLED_ON_AND (csp->flags & CSP_FLAG_TOGGLED_ON) &&
1410 #else /* ifndef FEATURE_TOGGLE */
1411 # define IS_TOGGLED_ON_AND
1412 #endif /* ndef FEATURE_TOGGLE */
1413 #ifdef FEATURE_FORCE_LOAD
1414 # define IS_NOT_FORCED_AND !(csp->flags & CSP_FLAG_FORCED) &&
1415 #else /* ifndef FEATURE_FORCE_LOAD */
1416 # define IS_NOT_FORCED_AND
1417 #endif /* def FEATURE_FORCE_LOAD */
1419 #define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
1421 char buf[BUFFER_SIZE];
1429 int ms_iis5_hack = 0;
1430 size_t byte_count = 0;
1431 int forwarded_connect_retries = 0;
1432 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1433 const struct forward_spec * fwd;
1434 struct http_request *http;
1435 int len; /* for buffer sizes (and negative error codes) */
1436 #ifdef FEATURE_KILL_POPUPS
1437 int block_popups; /* bool, 1==will block popups */
1438 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1439 #endif /* def FEATURE_KILL_POPUPS */
1441 int pcrs_filter; /* bool, 1==will filter through pcrs */
1442 int gif_deanimate; /* bool, 1==will deanimate gifs */
1443 int jpeg_inspect; /* bool, 1==will inspect jpegs */
1445 /* Function that does the content filtering for the current request */
1446 char *(*content_filter)() = NULL;
1448 /* Skeleton for HTTP response, if we should intercept the request */
1449 struct http_response *rsp;
1451 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1452 struct list header_list;
1453 struct list *headers = &header_list;
1458 * Read the client's request. Note that since we're not using select() we
1459 * could get blocked here if a client connected, then didn't say anything!
1464 len = read_socket(csp->cfd, buf, sizeof(buf));
1466 if (len <= 0) break; /* error! */
1469 * If there is no memory left for buffering the
1470 * request, there is nothing we can do but hang up
1472 if (add_to_iob(csp, buf, len))
1477 req = get_header(csp);
1481 break; /* no HTTP request! */
1486 continue; /* more to come! */
1489 /* Does the request line look invalid? */
1490 if (client_protocol_is_unsupported(csp, req))
1493 * Yes. The request has already been
1494 * answered with a error response, the buffers
1495 * were freed and we're done with chatting.
1500 #ifdef FEATURE_FORCE_LOAD
1501 /* If this request contains the FORCE_PREFIX,
1502 * better get rid of it now and set the force flag --oes
1505 if (strstr(req, FORCE_PREFIX))
1507 strclean(req, FORCE_PREFIX);
1508 log_error(LOG_LEVEL_FORCE, "Enforcing request \"%s\".\n", req);
1509 csp->flags |= CSP_FLAG_FORCED;
1512 #endif /* def FEATURE_FORCE_LOAD */
1514 switch( parse_http_request(req, http, csp) )
1517 log_error(LOG_LEVEL_ERROR, "Out of memory while parsing request.");
1520 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", req);
1528 if (http->cmd == NULL)
1530 strcpy(buf, CHEADER);
1531 write_socket(csp->cfd, buf, strlen(buf));
1532 /* XXX: Use correct size */
1533 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 400 0", csp->ip_addr_str);
1534 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
1536 free_http_request(http);
1540 /* grab the rest of the client's headers */
1544 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
1546 len = read_socket(csp->cfd, buf, sizeof(buf));
1549 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1554 * If there is no memory left for buffering the
1555 * request, there is nothing we can do but hang up
1557 if (add_to_iob(csp, buf, len))
1564 if (p == NULL) break;
1571 if (http->host == NULL)
1574 * If we still don't know the request destination,
1575 * the request is invalid or the client uses
1576 * Privoxy without it's knowledge.
1578 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1581 * Our attempts to get the request destination
1582 * elsewhere failed or Privoxy is configured
1583 * to only accept proxy requests.
1585 * An error response has already been send
1586 * and we're done here.
1592 /* decide how to route the HTTP request */
1594 if ((fwd = forward_url(http, csp)) == NULL)
1596 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
1597 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1600 /* build the http request to send to the server
1601 * we have to do one of the following:
1603 * create = use the original HTTP request to create a new
1604 * HTTP request that has either the path component
1605 * without the http://domainspec (w/path) or the
1606 * full orininal URL (w/url)
1607 * Note that the path and/or the HTTP version may
1608 * have been altered by now.
1610 * connect = Open a socket to the host:port of the server
1611 * and short-circuit server and client socket.
1613 * pass = Pass the request unchanged if forwarding a CONNECT
1614 * request to a parent proxy. Note that we'll be sending
1615 * the CFAIL message ourselves if connecting to the parent
1616 * fails, but we won't send a CSUCCEED message if it works,
1617 * since that would result in a double message (ours and the
1618 * parent's). After sending the request to the parent, we simply
1621 * here's the matrix:
1624 * +--------+--------+
1626 * 0 | create | connect|
1628 * Forwarding +--------+--------+
1630 * 1 | create | pass |
1632 * +--------+--------+
1637 * Determine the actions for this URL
1639 #ifdef FEATURE_TOGGLE
1640 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1642 /* Most compatible set of actions (i.e. none) */
1643 init_current_action(csp->action);
1646 #endif /* ndef FEATURE_TOGGLE */
1648 url_actions(http, csp);
1653 * Check if a CONNECT request is allowable:
1654 * In the absence of a +limit-connect action, allow only port 443.
1655 * If there is an action, allow whatever matches the specificaton.
1659 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
1660 || (csp->action->flags & ACTION_LIMIT_CONNECT
1661 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
1663 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
1666 * The response may confuse some clients,
1667 * but makes unblocking easier.
1669 log_error(LOG_LEVEL_ERROR, "Marking suspicious CONNECT request from %s for blocking.",
1671 csp->action->flags |= ACTION_BLOCK;
1676 strcpy(buf, CFORBIDDEN);
1677 write_socket(csp->cfd, buf, strlen(buf));
1678 log_error(LOG_LEVEL_CONNECT, "Denying suspicious CONNECT request from %s", csp->ip_addr_str);
1679 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 403 0", csp->ip_addr_str);
1687 * Downgrade http version from 1.1 to 1.0 if +downgrade
1690 if ( (http->ssl == 0)
1691 && (!strcmpic(http->ver, "HTTP/1.1"))
1692 && (csp->action->flags & ACTION_DOWNGRADE))
1695 http->ver = strdup("HTTP/1.0");
1697 if (http->ver == NULL)
1699 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1704 * Save a copy of the original request for logging
1706 http->ocmd = strdup(http->cmd);
1708 if (http->ocmd == NULL)
1710 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
1714 * (Re)build the HTTP request for non-SSL requests.
1715 * If forwarding, use the whole URL, else, use only the path.
1721 http->cmd = strdup(http->gpc);
1722 string_append(&http->cmd, " ");
1724 if (fwd->forward_host)
1726 string_append(&http->cmd, http->url);
1730 string_append(&http->cmd, http->path);
1732 string_append(&http->cmd, " ");
1733 string_append(&http->cmd, http->ver);
1735 if (http->cmd == NULL)
1737 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1739 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", http->cmd);
1741 enlist(csp->headers, http->cmd);
1743 /* Append the previously read headers */
1744 list_append_list_unique(csp->headers, headers);
1745 destroy_list(headers);
1748 * If the user has not supplied any wafers, and the user has not
1749 * told us to suppress the vanilla wafer, then send the vanilla wafer.
1751 if (list_is_empty(csp->action->multi[ACTION_MULTI_WAFER])
1752 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
1754 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
1758 #ifdef FEATURE_KILL_POPUPS
1759 block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
1760 #endif /* def FEATURE_KILL_POPUPS */
1762 pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
1763 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER]));
1765 gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
1767 jpeg_inspect = ((csp->action->flags & ACTION_JPEG_INSPECT) != 0);
1770 * We have a request. Now, check to see if we need to
1771 * intercept it, i.e. If ..
1775 /* We may not forward the request by rfc2616 sect 14.31 */
1776 (NULL != (rsp = direct_response(csp)))
1778 /* or we are enabled and... */
1779 || (IS_ENABLED_AND (
1781 /* ..the request was blocked */
1782 ( NULL != (rsp = block_url(csp)))
1784 /* ..or untrusted */
1785 #ifdef FEATURE_TRUST
1786 || ( NULL != (rsp = trust_url(csp)))
1787 #endif /* def FEATURE_TRUST */
1789 /* ..or a redirect kicked in */
1790 || ( NULL != (rsp = redirect_url(csp)))
1794 * .. or a CGI call was detected and answered.
1796 * This check comes last to give the user the power
1797 * to deny acces to some (or all) of the cgi pages.
1799 || (NULL != (rsp = dispatch_cgi(csp)))
1804 * Deliver, log and free the interception
1805 * response. Afterwards we're done here.
1807 send_crunch_response(csp, rsp);
1808 #ifdef FEATURE_STATISTICS
1809 /* Count as a rejected request */
1810 csp->flags |= CSP_FLAG_REJECTED;
1811 #endif /* def FEATURE_STATISTICS */
1816 hdr = sed(client_patterns, add_client_headers, csp);
1819 /* FIXME Should handle error properly */
1820 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
1823 list_remove_all(csp->headers);
1825 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
1827 if (fwd->forward_host)
1829 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
1830 fwd->forward_host, fwd->forward_port, http->hostport);
1834 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
1837 /* here we connect to the server, gateway, or the forwarder */
1839 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
1840 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
1842 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
1843 forwarded_connect_retries, http->hostport);
1846 if (csp->sfd == JB_INVALID_SOCKET)
1848 if (fwd->type != SOCKS_NONE)
1851 rsp = error_response(csp, "forwarding-failed", errno);
1853 else if (errno == EINVAL)
1855 rsp = error_response(csp, "no-such-domain", errno);
1859 rsp = error_response(csp, "connect-failed", errno);
1860 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
1865 /* Write the answer to the client */
1868 send_crunch_response(csp, rsp);
1875 if (fwd->forward_host || (http->ssl == 0))
1877 /* write the client's (modified) header to the server
1878 * (along with anything else that may be in the buffer)
1881 if (write_socket(csp->sfd, hdr, strlen(hdr))
1882 || (flush_socket(csp->sfd, csp) < 0))
1884 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
1887 rsp = error_response(csp, "connect-failed", errno);
1891 send_crunch_response(csp, rsp);
1901 * We're running an SSL tunnel and we're not forwarding,
1902 * so just send the "connect succeeded" message to the
1903 * client, flush the rest, and get out of the way.
1905 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 0",
1906 csp->ip_addr_str, http->ocmd);
1908 if (write_socket(csp->cfd, CSUCCEED, sizeof(CSUCCEED)-1))
1916 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
1918 /* we're finished with the client's header */
1921 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
1923 /* pass data between the client and server
1924 * until one or the other shuts down the connection.
1933 * FD_ZERO here seems to point to an errant macro which crashes.
1934 * So do this by hand for now...
1936 memset(&rfds,0x00,sizeof(fd_set));
1940 FD_SET(csp->cfd, &rfds);
1941 FD_SET(csp->sfd, &rfds);
1943 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
1947 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
1951 /* this is the body of the browser's request
1952 * just read it and write it.
1955 if (FD_ISSET(csp->cfd, &rfds))
1957 len = read_socket(csp->cfd, buf, sizeof(buf));
1961 break; /* "game over, man" */
1964 if (write_socket(csp->sfd, buf, (size_t)len))
1966 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
1973 * The server wants to talk. It could be the header or the body.
1974 * If `hdr' is null, then it's the header otherwise it's the body.
1975 * FIXME: Does `hdr' really mean `host'? No.
1979 if (FD_ISSET(csp->sfd, &rfds))
1982 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
1986 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
1988 rsp = error_response(csp, "connect-failed", errno);
1992 send_crunch_response(csp, rsp);
1998 /* Add a trailing zero. This lets filter_popups
1999 * use string operations.
2003 #ifdef FEATURE_KILL_POPUPS
2004 /* Filter the popups on this read. */
2005 if (block_popups_now)
2007 filter_popups(buf, csp);
2009 #endif /* def FEATURE_KILL_POPUPS */
2011 /* Normally, this would indicate that we've read
2012 * as much as the server has sent us and we can
2013 * close the client connection. However, Microsoft
2014 * in its wisdom has released IIS/5 with a bug that
2015 * prevents it from sending the trailing \r\n in
2016 * a 302 redirect header (and possibly other headers).
2017 * To work around this if we've haven't parsed
2018 * a full header we'll append a trailing \r\n
2019 * and see if this now generates a valid one.
2021 * This hack shouldn't have any impacts. If we've
2022 * already transmitted the header or if this is a
2023 * SSL connection, then we won't bother with this
2024 * hack. So we only work on partially received
2025 * headers. If we append a \r\n and this still
2026 * doesn't generate a valid header, then we won't
2027 * transmit anything to the client.
2032 if (server_body || http->ssl)
2035 * If we have been buffering up the document,
2036 * now is the time to apply content modification
2037 * and send the result to the client.
2042 * If the content filter fails, use the original
2043 * buffer and length.
2044 * (see p != NULL ? p : csp->iob->cur below)
2046 if (NULL == (p = (*content_filter)(csp)))
2048 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2051 hdr = sed(server_patterns_light, NULL, csp);
2055 /* FIXME Should handle error properly */
2056 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2059 if (write_socket(csp->cfd, hdr, strlen(hdr))
2060 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2062 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2072 break; /* "game over, man" */
2076 * This is NOT the body, so
2077 * Let's pretend the server just sent us a blank line.
2079 snprintf(buf, sizeof(buf), "\r\n");
2080 len = (int)strlen(buf);
2083 * Now, let the normal header parsing algorithm below do its
2084 * job. If it fails, we'll exit instead of continuing.
2091 * If this is an SSL connection or we're in the body
2092 * of the server document, just write it to the client,
2093 * unless we need to buffer the body for later content-filtering
2096 if (server_body || http->ssl)
2101 * If there is no memory left for buffering the content, or the buffer limit
2102 * has been reached, switch to non-filtering mode, i.e. make & write the
2103 * header, flush the iob and buf, and get out of the way.
2105 if (add_to_iob(csp, buf, len))
2110 log_error(LOG_LEVEL_ERROR, "Flushing header and buffers. Stepping back from filtering.");
2112 hdr = sed(server_patterns, add_server_headers, csp);
2116 * Memory is too tight to even generate the header.
2117 * Send our static "Out-of-memory" page.
2119 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2120 rsp = cgi_error_memory();
2121 send_crunch_response(csp, rsp);
2126 hdrlen = strlen(hdr);
2128 if (write_socket(csp->cfd, hdr, hdrlen)
2129 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2130 || (write_socket(csp->cfd, buf, (size_t)len)))
2132 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2138 byte_count += hdrlen + (size_t)flushed + (size_t)len;
2140 content_filter = NULL;
2147 if (write_socket(csp->cfd, buf, (size_t)len))
2149 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2153 byte_count += (size_t)len;
2158 /* we're still looking for the end of the
2159 * server's header ... (does that make header
2160 * parsing an "out of body experience" ?
2164 * buffer up the data we just read. If that fails,
2165 * there's little we can do but send our static
2166 * out-of-memory page.
2168 if (add_to_iob(csp, buf, len))
2170 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2171 rsp = cgi_error_memory();
2172 send_crunch_response(csp, rsp);
2177 /* Convert iob into something sed() can digest */
2178 if (JB_ERR_PARSE == get_server_headers(csp))
2182 /* Well, we tried our MS IIS/5
2183 * hack and it didn't work.
2184 * The header is incomplete
2185 * and there isn't anything
2186 * we can do about it.
2192 /* Since we have to wait for
2193 * more from the server before
2194 * we can parse the headers
2195 * we just continue here.
2201 /* Did we actually get anything? */
2202 if (NULL == csp->headers->first)
2204 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2205 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2206 strcpy(buf, NO_SERVER_DATA_RESPONSE);
2207 write_socket(csp->cfd, buf, strlen(buf));
2208 free_http_request(http);
2212 /* we have now received the entire header.
2213 * filter it and send the result to the client
2216 hdr = sed(server_patterns, add_server_headers, csp);
2219 /* FIXME Should handle error properly */
2220 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2223 #ifdef FEATURE_KILL_POPUPS
2224 /* Start blocking popups if appropriate. */
2226 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2227 !http->ssl && /* We talk plaintext */
2228 block_popups) /* Policy allows */
2230 block_popups_now = 1;
2232 * Filter the part of the body that came in the same read
2233 * as the last headers:
2235 filter_popups(csp->iob->cur, csp);
2238 #endif /* def FEATURE_KILL_POPUPS */
2240 /* Buffer and pcrs filter this if appropriate. */
2242 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2243 !http->ssl && /* We talk plaintext */
2244 pcrs_filter) /* Policy allows */
2246 content_filter = pcrs_filter_response;
2249 /* Buffer and gif_deanimate this if appropriate. */
2251 if ((csp->content_type & CT_GIF) && /* It's an image/gif MIME-Type */
2252 !http->ssl && /* We talk plaintext */
2253 gif_deanimate) /* Policy allows */
2255 content_filter = gif_deanimate_response;
2258 /* Buffer and jpg_inspect this if appropriate. */
2260 if ((csp->content_type & CT_JPEG) && /* It's an image/jpeg MIME-Type */
2261 !http->ssl && /* We talk plaintext */
2262 jpeg_inspect) /* Policy allows */
2264 content_filter = jpeg_inspect_response;
2268 * Only write if we're not buffering for content modification
2270 if (!content_filter)
2272 /* write the server's (modified) header to
2273 * the client (along with anything else that
2274 * may be in the buffer)
2277 if (write_socket(csp->cfd, hdr, strlen(hdr))
2278 || ((len = flush_socket(csp->cfd, csp)) < 0))
2280 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2282 /* the write failed, so don't bother
2283 * mentioning it to the client...
2284 * it probably can't hear us anyway.
2290 byte_count += (size_t)len;
2293 /* we're finished with the server's header */
2298 /* If this was a MS IIS/5 hack then it means
2299 * the server has already closed the
2300 * connection. Nothing more to read. Time
2311 return; /* huh? we should never get here */
2314 if (csp->content_length == 0)
2317 * If Privoxy didn't recalculate the
2318 * Content-Lenght, byte_count is still
2321 csp->content_length = byte_count;
2324 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2325 csp->ip_addr_str, http->ocmd, csp->content_length);
2329 /*********************************************************************
2333 * Description : This is little more than chat. We only "serve" to
2334 * to close any socket that chat may have opened.
2337 * 1 : csp = Current client state (buffers, headers, etc...)
2341 *********************************************************************/
2343 void serve(struct client_state *csp)
2344 #else /* ifndef AMIGA */
2345 static void serve(struct client_state *csp)
2346 #endif /* def AMIGA */
2349 close_socket(csp->cfd);
2351 if (csp->sfd != JB_INVALID_SOCKET)
2353 close_socket(csp->sfd);
2356 csp->flags &= ~CSP_FLAG_ACTIVE;
2362 /*********************************************************************
2364 * Function : server_thread
2366 * Description : We only exist to call `serve' in a threaded environment.
2369 * 1 : data = Current client state (buffers, headers, etc...)
2371 * Returns : Always 0.
2373 *********************************************************************/
2374 static int32 server_thread(void *data)
2376 serve((struct client_state *) data);
2383 /*********************************************************************
2387 * Description : Print usage info & exit.
2389 * Parameters : Pointer to argv[0] for identifying ourselves
2393 *********************************************************************/
2394 void usage(const char *myname)
2396 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2398 "Usage: %s [--help] [--version] [configfile]\n"
2400 "Usage: %s [--help] [--version] [--no-daemon] [--pidfile pidfile] [--user user[.group]] [configfile]\n"
2402 "Aborting.\n", myname);
2409 /*********************************************************************
2411 * Function : initialize_mutexes
2413 * Description : Prepares mutexes if mutex support is available.
2417 * Returns : Void, exits in case of errors.
2419 *********************************************************************/
2420 void initialize_mutexes()
2424 #ifdef FEATURE_PTHREAD
2426 * Prepare global mutex semaphores
2428 err = pthread_mutex_init(&log_mutex, 0);
2430 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2433 * XXX: The assumptions below are a bit naive
2434 * and can cause locks that aren't necessary.
2436 * For example older FreeBSD versions (< 6.x?)
2437 * have no gethostbyname_r, but gethostbyname is
2440 #ifndef HAVE_GMTIME_R
2441 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2442 #endif /* ndef HAVE_GMTIME_R */
2444 #ifndef HAVE_LOCALTIME_R
2445 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2446 #endif /* ndef HAVE_GMTIME_R */
2448 #ifndef HAVE_GETHOSTBYADDR_R
2449 if (!err) err = pthread_mutex_init(&gethostbyaddr_mutex, 0);
2450 #endif /* ndef HAVE_GETHOSTBYADDR_R */
2452 #ifndef HAVE_GETHOSTBYNAME_R
2453 if (!err) err = pthread_mutex_init(&gethostbyname_mutex, 0);
2454 #endif /* ndef HAVE_GETHOSTBYNAME_R */
2457 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2458 #endif /* ndef HAVE_RANDOM */
2459 #endif /* FEATURE_PTHREAD */
2462 * TODO: mutex support for mingw32 would be swell.
2467 printf("Fatal error. Mutex initialization failed: %s.\n",
2476 /*********************************************************************
2480 * Description : Load the config file and start the listen loop.
2481 * This function is a lot more *sane* with the `load_config'
2482 * and `listen_loop' functions; although it stills does
2483 * a *little* too much for my taste.
2486 * 1 : argc = Number of parameters (including $0).
2487 * 2 : argv = Array of (char *)'s to the parameters.
2489 * Returns : 1 if : can't open config file, unrecognized directive,
2490 * stats requested in multi-thread mode, can't open the
2491 * log file, can't open the jar file, listen port is invalid,
2492 * any load fails, and can't bind port.
2494 * Else main never returns, the process must be signaled
2495 * to terminate execution. Or, on Windows, use the
2496 * "File", "Exit" menu option.
2498 *********************************************************************/
2500 int real_main(int argc, const char *argv[])
2502 int main(int argc, const char *argv[])
2506 unsigned int random_seed;
2508 struct passwd *pw = NULL;
2509 struct group *grp = NULL;
2518 #if !defined(_WIN32)
2526 * Parse the command line arguments
2528 while (++argc_pos < argc)
2531 /* Check to see if the service must be installed or uninstalled */
2532 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2534 const char *pName = argv[argc_pos] + 9;
2537 exit( (install_service(pName)) ? 0 : 1 );
2539 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
2541 const char *pName = argv[argc_pos] + 11;
2544 exit((uninstall_service(pName)) ? 0 : 1);
2546 else if (strcmp(argv[argc_pos], "--service" ) == 0)
2548 bRunAsService = TRUE;
2549 w32_set_service_cwd();
2550 atexit(w32_service_exit_notify);
2553 #endif /* defined(_WIN32) */
2556 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2558 if (strcmp(argv[argc_pos], "--help") == 0)
2563 else if(strcmp(argv[argc_pos], "--version") == 0)
2565 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
2571 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
2576 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
2578 if (++argc_pos == argc) usage(argv[0]);
2579 pidfile = strdup(argv[argc_pos]);
2582 else if (strcmp(argv[argc_pos], "--user" ) == 0)
2584 if (++argc_pos == argc) usage(argv[argc_pos]);
2586 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
2589 if (NULL == (grp = getgrnam(p)))
2591 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
2595 if (NULL == (pw = getpwnam(argv[argc_pos])))
2597 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
2600 if (p != NULL) *--p = '\0';
2603 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
2608 #endif /* defined(unix) */
2609 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
2611 configfile = argv[argc_pos];
2614 } /* -END- while (more arguments) */
2617 if ( *configfile != '/' )
2619 char *abs_file, cwd[1024];
2621 /* make config-filename absolute here */
2622 if ( !(getcwd(cwd, sizeof(cwd))))
2624 perror("get working dir failed");
2628 if (!(basedir = strdup(cwd))
2629 || (!(abs_file = malloc( strlen( basedir ) + strlen( configfile ) + 5 ))))
2631 perror("malloc failed");
2634 strcpy( abs_file, basedir );
2635 strcat( abs_file, "/" );
2636 strcat( abs_file, configfile );
2637 configfile = abs_file;
2639 #endif /* defined unix */
2643 clients->next = NULL;
2647 #elif defined(_WIN32)
2651 /* Prepare mutexes if supported and necessary. */
2652 initialize_mutexes();
2654 random_seed = (unsigned int)time(NULL);
2656 srandom(random_seed);
2659 #endif /* ifdef HAVE_RANDOM */
2662 * Unix signal handling
2664 * Catch the abort, interrupt and terminate signals for a graceful exit
2665 * Catch the hangup signal so the errlog can be reopened.
2666 * Ignore the broken pipe signals (FIXME: Why?)
2668 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
2671 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
2672 const int ignored_signals[] = { SIGPIPE, 0 };
2674 for (idx = 0; catched_signals[idx] != 0; idx++)
2676 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
2677 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
2679 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
2680 #endif /* ifdef sun */
2682 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
2686 for (idx = 0; ignored_signals[idx] != 0; idx++)
2688 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
2690 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
2695 #else /* ifdef _WIN32 */
2696 # ifdef _WIN_CONSOLE
2698 * We *are* in a windows console app.
2699 * Print a verbose messages about FAQ's and such
2701 printf("%s", win32_blurb);
2702 # endif /* def _WIN_CONSOLE */
2703 #endif /* def _WIN32 */
2706 /* Initialize the CGI subsystem */
2707 cgi_init_error_messages();
2710 * If runnig on unix and without the --nodaemon
2711 * option, become a daemon. I.e. fork, detach
2712 * from tty and get process group leadership
2725 if ( pid < 0 ) /* error */
2730 else if ( pid != 0 ) /* parent */
2735 * must check for errors
2736 * child died due to missing files aso
2739 wpid = waitpid( pid, &status, WNOHANG );
2748 /* Should be more portable, but not as well tested */
2753 #else /* ndef __FreeBSD__ */
2755 #endif /* ndef __FreeBSD__ */
2756 fd = open("/dev/tty", O_RDONLY);
2759 /* no error check here */
2760 ioctl( fd, TIOCNOTTY,0 );
2764 /* FIXME: should close stderr (fd 2) here too, but the test
2766 * and load config file is done in listen_loop() and puts
2767 * some messages on stderr there.
2774 } /* -END- if (!no_daemon) */
2777 * As soon as we have written the PID file, we can switch
2778 * to the user and group ID indicated by the --user option
2784 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
2786 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
2792 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
2794 if (chroot(pw->pw_dir) < 0)
2796 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
2800 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
2803 if (setuid(pw->pw_uid))
2805 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
2809 char putenv_dummy[64];
2811 strcpy(putenv_dummy, "HOME=/");
2812 if (putenv(putenv_dummy) != 0)
2814 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
2817 snprintf(putenv_dummy, 64, "USER=%s", pw->pw_name);
2818 if (putenv(putenv_dummy) != 0)
2820 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
2826 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
2829 #endif /* defined unix */
2832 /* This will be FALSE unless the command line specified --service
2836 /* Yup, so now we must attempt to establish a connection
2837 * with the service dispatcher. This will only work if this
2838 * process was launched by the service control manager to
2839 * actually run as a service. If this isn't the case, i've
2840 * known it take around 30 seconds or so for the call to return.
2843 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
2844 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
2846 /* Service has run, and at this point is now being stopped, so just return */
2851 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
2853 /* An error occurred. Usually it's because --service was wrongly specified
2854 * and we were unable to connect to the Service Control Dispatcher because
2855 * it wasn't expecting us and is therefore not listening.
2857 * For now, just continue below to call the listen_loop function.
2860 #endif /* def _WIN32 */
2870 /*********************************************************************
2872 * Function : bind_port_helper
2874 * Description : Bind the listen port. Handles logging, and aborts
2878 * 1 : config = Privoxy configuration. Specifies port
2881 * Returns : Port that was opened.
2883 *********************************************************************/
2884 static jb_socket bind_port_helper(struct configuration_spec * config)
2889 if ( (config->haddr != NULL)
2890 && (config->haddr[0] == '1')
2891 && (config->haddr[1] == '2')
2892 && (config->haddr[2] == '7')
2893 && (config->haddr[3] == '.') )
2895 log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
2898 else if (config->haddr == NULL)
2900 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
2905 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
2906 config->hport, config->haddr);
2909 result = bind_port(config->haddr, config->hport, &bfd);
2916 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
2917 "There may be another Privoxy or some other "
2918 "proxy running on port %d",
2919 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
2920 config->hport, config->hport);
2923 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
2924 "The hostname is not resolvable",
2925 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
2928 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
2929 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
2932 /* shouldn't get here */
2933 return JB_INVALID_SOCKET;
2936 config->need_bind = 0;
2943 /* Without this simple workaround we get this compiler warning from _beginthread
2944 * warning C4028: formal parameter 1 different from declaration
2946 void w32_service_listen_loop(void *p)
2950 #endif /* def _WIN32 */
2953 /*********************************************************************
2955 * Function : listen_loop
2957 * Description : bind the listen port and enter a "FOREVER" listening loop.
2963 *********************************************************************/
2964 static void listen_loop(void)
2966 struct client_state *csp = NULL;
2968 struct configuration_spec * config;
2970 config = load_config();
2972 bfd = bind_port_helper(config);
2974 #ifdef FEATURE_GRACEFUL_TERMINATION
2975 while (!g_terminate)
2980 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
2981 while (waitpid(-1, NULL, WNOHANG) > 0)
2983 /* zombie children */
2985 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
2988 * Free data that was used by died threads
2994 * Re-open the errlog after HUP signal
2996 if (received_hup_signal)
2998 init_error_log(Argv[0], config->logfile, config->debug);
2999 received_hup_signal = 0;
3004 #ifdef FEATURE_COOKIE_JAR
3006 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3007 * already open. I think unload_configfile() is not being run, which should do
3008 * this work. Until that can get resolved, we'll use this workaround.
3012 if (csp->config->jar)
3014 fclose(csp->config->jar);
3015 csp->config->jar = NULL;
3017 #endif /* FEATURE_COOKIE_JAR */
3018 #endif /* __OS2__ */
3020 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3022 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3026 csp->flags |= CSP_FLAG_ACTIVE;
3027 csp->sfd = JB_INVALID_SOCKET;
3029 csp->config = config = load_config();
3031 if ( config->need_bind )
3034 * Since we were listening to the "old port", we will not see
3035 * a "listen" param change until the next IJB request. So, at
3036 * least 1 more request must be made for us to find the new
3037 * setting. I am simply closing the old socket and binding the
3040 * Which-ever is correct, we will serve 1 more page via the
3041 * old settings. This should probably be a "show-proxy-args"
3042 * request. This should not be a so common of an operation
3043 * that this will hurt people's feelings.
3048 bfd = bind_port_helper(config);
3051 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3053 if (!accept_connection(csp, bfd))
3055 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3068 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3071 #ifdef FEATURE_TOGGLE
3072 if (global_toggle_state)
3074 csp->flags |= CSP_FLAG_TOGGLED_ON;
3076 #endif /* def FEATURE_TOGGLE */
3078 if (run_loader(csp))
3080 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3081 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3085 if (block_acl(NULL,csp))
3087 log_error(LOG_LEVEL_CONNECT, "Connection dropped due to ACL");
3088 close_socket(csp->cfd);
3092 #endif /* def FEATURE_ACL */
3094 /* add it to the list of clients */
3095 csp->next = clients->next;
3096 clients->next = csp;
3098 if (config->multi_threaded)
3102 /* this is a switch () statment in the C preprocessor - ugh */
3103 #undef SELECTED_ONE_OPTION
3105 /* Use Pthreads in preference to native code */
3106 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3107 #define SELECTED_ONE_OPTION
3109 pthread_t the_thread;
3110 pthread_attr_t attrs;
3112 pthread_attr_init(&attrs);
3113 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3114 errno = pthread_create(&the_thread, &attrs,
3115 (void * (*)(void *))serve, csp);
3116 child_id = errno ? -1 : 0;
3117 pthread_attr_destroy(&attrs);
3121 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3122 #define SELECTED_ONE_OPTION
3123 child_id = _beginthread(
3124 (void (*)(void *))serve,
3129 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3130 #define SELECTED_ONE_OPTION
3131 child_id = _beginthread(
3132 (void(* _Optlink)(void*))serve,
3138 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3139 #define SELECTED_ONE_OPTION
3141 thread_id tid = spawn_thread
3142 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3144 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3146 child_id = (int) tid;
3155 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3156 #define SELECTED_ONE_OPTION
3157 csp->cfd = ReleaseSocket(csp->cfd, -1);
3160 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3161 NP_Output, Output(),
3162 NP_CloseOutput, FALSE,
3163 NP_Name, (ULONG)"privoxy child",
3167 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3168 NP_Output, Output(),
3169 NP_CloseOutput, FALSE,
3170 NP_Name, (ULONG)"privoxy child",
3171 NP_StackSize, 200*1024,
3177 ((struct Task *)child_id)->tc_UserData = csp;
3178 Signal((struct Task *)child_id, SIGF_SINGLE);
3183 #if !defined(SELECTED_ONE_OPTION)
3186 /* This block is only needed when using fork().
3187 * When using threads, the server thread was
3188 * created and run by the call to _beginthread().
3190 if (child_id == 0) /* child */
3193 #ifdef FEATURE_TOGGLE
3194 int inherited_toggle_state = global_toggle_state;
3195 #endif /* def FEATURE_TOGGLE */
3200 * If we've been toggled or we've blocked the request, tell Mom
3203 #ifdef FEATURE_TOGGLE
3204 if (inherited_toggle_state != global_toggle_state)
3206 rc |= RC_FLAG_TOGGLED;
3208 #endif /* def FEATURE_TOGGLE */
3210 #ifdef FEATURE_STATISTICS
3211 if (csp->flags & CSP_FLAG_REJECTED)
3213 rc |= RC_FLAG_BLOCKED;
3215 #endif /* ndef FEATURE_STATISTICS */
3219 else if (child_id > 0) /* parent */
3221 /* in a fork()'d environment, the parent's
3222 * copy of the client socket and the CSP
3226 #if !defined(_WIN32) && !defined(__CYGWIN__)
3228 wait( &child_status );
3231 * Evaluate child's return code: If the child has
3232 * - been toggled, toggle ourselves
3233 * - blocked its request, bump up the stats counter
3236 #ifdef FEATURE_TOGGLE
3237 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3239 global_toggle_state = !global_toggle_state;
3241 #endif /* def FEATURE_TOGGLE */
3243 #ifdef FEATURE_STATISTICS
3245 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3249 #endif /* def FEATURE_STATISTICS */
3251 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3252 close_socket(csp->cfd);
3253 csp->flags &= ~CSP_FLAG_ACTIVE;
3257 #undef SELECTED_ONE_OPTION
3258 /* end of cpp switch () */
3260 if (child_id < 0) /* failed */
3262 char buf[BUFFER_SIZE];
3264 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3266 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3268 write_socket(csp->cfd, buf, strlen(buf));
3269 close_socket(csp->cfd);
3270 csp->flags &= ~CSP_FLAG_ACTIVE;
3281 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3283 /* Clean up. Aim: free all memory (no leaks) */
3284 #ifdef FEATURE_GRACEFUL_TERMINATION
3286 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3288 unload_current_config_file();
3289 unload_current_actions_file();
3290 unload_current_re_filterfile();
3291 #ifdef FEATURE_TRUST
3292 unload_current_trust_file();
3295 if (config->multi_threaded)
3302 } while ((clients->next != NULL) && (--i > 0));
3306 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3317 #ifdef FEATURE_COOKIE_JAR
3318 if (NULL != config->jar)
3320 fclose(config->jar);
3324 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3325 /* Cleanup - remove taskbar icon etc. */
3330 #endif /* FEATURE_GRACEFUL_TERMINATION */