1 const char jcc_rcs[] = "$Id: jcc.c,v 1.153 2007/10/14 14:12:41 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 1.153 2007/10/14 14:12:41 fabiankeil
37 * When in daemon mode, close stderr after the configuration file has been
38 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
40 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
41 * - Fix a crash when parsing invalid requests whose first header
42 * is rejected by get_header(). Regression (re?)introduced
43 * in r1.143 by yours truly.
44 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
45 * client_cookie_adder() to make sure send-vanilla-wafer can be
46 * controlled through tags (and thus regression-tested).
48 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
49 * - Move get_filter_function() from jcc.c to filters.c
50 * so the filter functions can be static.
51 * - Don't bother filtering body-less responses.
53 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
54 * Execute content filters through execute_content_filter().
56 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
57 * Initialize req to NULL to make sure it's defined if the
58 * first read_socket() call fails. Reported by icmp30.
60 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
61 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
62 * extensive comments moved to user manual.
64 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
65 * Don't crash if a broken header filter wiped out the request line.
67 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
68 * Fix byte_count calculation in case of flushes
69 * and don't parse the server headers a second time.
71 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
72 * - If there's a connection problem after we already forwarded
73 * parts of the original content, just hang up. Fixes BR#1776724.
74 * - Fix warnings about unused code on mingw32.
75 * - In case of flushes, calculate the byte count
76 * less incorrectly (I think).
78 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
79 * Add some more prototypes for static functions.
81 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
82 * Comment out request_contains_null_bytes() until it's used again.
84 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
85 * #1763173 from Stefan Huehner: s@const static@static const@
86 * and declare some more functions static.
88 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
89 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
90 * and explain why they were rejected in the first place.
91 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
92 * CONNECT requests. The request line was missing.
93 * - Add two more XXX reminders as we don't have enough already.
95 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
96 * As Hal noticed, checking dispatch_cgi() as the last cruncher
97 * looks like a bug if CGI requests are blocked unintentionally,
98 * so don't do it unless the user enabled the new config option
99 * "allow-cgi-request-crunching".
101 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
102 * - Allow to rewrite the request destination behind the client's back.
103 * - Turn the weird-looking unconditional for loop that
104 * reads the client request into a conditional while loop.
105 * Move the stuff that only runs once out of the loop.
106 * - Move parts of chat(), server_content_type() and the
107 * necessary stuff to fix BR#1750917 into get_filter_function().
109 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
110 * Temporary workaround for BR#1730105.
112 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
113 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
114 * deadlocks and crashes on OpenBSD and possibly other OS with neither
115 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
116 * Thanks to Ralf Horstmann for report and solution.
118 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
119 * Add forward-override{} to change the forwarding settings through
120 * action sections. This is mainly interesting to forward different
121 * clients differently (for example based on User-Agent or request
124 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
125 * - Let usage() mention the --chroot parameter.
126 * - Use read_socket() consistently and always leave
127 * the last buffer byte alone, even in cases where
128 * null termination (currently) doesn't matter.
130 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
131 * - Fix config file loading on Unix if no config file is specified.
132 * Since r1.97 Privoxy would always interpret the last argument as
133 * config file, even if it's a valid command line option.
134 * - Abort in case of unrecognized command line options. Closes #1719696.
135 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
136 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
138 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
139 * - Don't rerun crunchers that only depend on the request URL.
140 * - Don't count redirects and CGI requests as "blocked requests".
142 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
143 * Support crunching based on tags created by server-header taggers.
145 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
146 * Make HTTP snippets static (again). Add a Content-Type for those
147 * with content so the browser doesn't guess it based on the URL.
149 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
150 * Move crunching and request line rebuilding out of chat().
152 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
153 * Introduce tags as alternative way to specify which
154 * actions apply to a request. At the moment tags can be
155 * created based on client and server headers.
157 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
158 * Don't CLF-log CONNECT requests twice.
160 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
161 * Log the source address for ACL-related connection drops.
163 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
164 * New config option: enforce-blocks.
166 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
167 * - Move null byte check into separate function.
168 * - Don't confuse the client with error pages
169 * if a CONNECT request was already confirmed.
171 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
172 * Speed up NULL byte escaping and only log the complete
173 * NULL byte requests with header debugging enabled.
175 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
176 * Answer requests that contain NULL bytes with
177 * a custom response instead of waiting for more
178 * data until the client eventually hangs up.
180 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
181 * - Move delivery and logging of crunched responses
182 * from chat() into send_crunch_response().
183 * - Display the reason for generating http_responses.
184 * - Log the content length for LOG_LEVEL_CLF correctly
185 * (still incorrect for some fixed responses).
186 * - Reword an incorrect comment about
187 * treat-forbidden-connects-like-blocks violating
189 * - Add some log messages.
191 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
192 * Move mutex initialization into separate
193 * function and exit in case of errors.
195 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
196 * - Start to reduce chat()'s line count and move
197 * parts of it into separate functions.
198 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
200 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
201 * - Add Proxy-Agent header to HTTP snippets that are
202 * supposed to reach HTTP clients only.
203 * - Made a few CONNECT log messages more descriptive.
204 * - Catch completely empty server responses (as seen
205 * with Tor's fake ".noconnect" top level domain).
206 * - Use shiny new "forwarding-failed" template for socks errors.
208 * Revision 1.118 2007/01/07 07:43:43 joergs
209 * AmigaOS4 support added.
211 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
212 * Added config option accept-intercepted-requests
213 * and disabled it by default.
215 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
216 * Reverted parts of my last commit
217 * to keep error handling working.
219 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
220 * Fixed gcc43 conversion warnings.
222 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
223 * Fix -pedantic ISO C warning about converting
224 * from function pointer to object pointer.
226 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
227 * Silence compiler warning I introduced with my last commit.
229 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
230 * Mutex protect rand() if POSIX threading
231 * is used, warn the user if that's not possible
232 * and stop using it on _WIN32 where it could
235 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
236 * Don't prevent core dumps by catching SIGABRT.
237 * It's rude and makes debugging unreasonable painful.
239 * Revision 1.110 2006/12/13 14:52:53 etresoft
240 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
242 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
243 * Privoxy is now able to run as intercepting
244 * proxy in combination with any packet filter
245 * that does the port redirection. The destination
246 * is extracted from the "Host:" header which
247 * should be available for nearly all requests.
249 * Moved HTTP snipplets into jcc.c.
250 * Added error message for gopher proxy requests.
252 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
253 * Only unlink the pidfile if it's actually used.
255 * Change order of interception checks to make
256 * it possible to block or redirect requests for
259 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
260 * Make pthread mutex locking more generic. Instead of
261 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
262 * and use mutex locking unless there is an _r function
263 * available. Better safe than sorry.
265 * Fixes "./configure --disable-pthread" and should result
266 * in less threading-related problems on pthread-using platforms,
267 * but it still doesn't fix BR#1122404.
269 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
270 * Move pthread.h inclusion from jcc.c to jcc.h.
271 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
273 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
274 * Don't exit after receiving the second SIGHUP on Solaris.
276 * Fixes BR 1052235, but the same problem may exist on other
277 * systems. Once 3.0.6 is out we should use sigset()
278 * where available and see if it breaks anything.
280 * Revision 1.104 2006/09/23 13:26:38 roro
281 * Replace TABs by spaces in source code.
283 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
284 * Fix +redirect{}. Didn't work with -fast-redirects.
286 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
287 * Respond with 400 and a short text message
288 * if the client tries to use Privoxy as FTP proxy.
290 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
291 * Make number of retries in case of forwarded-connect problems
292 * a config file option (forwarded-connect-retries) and use 0 as
295 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
296 * Set random(3) seed.
298 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
299 * Follow the OpenBSD port's lead and protect the resolve
300 * functions on OpenBSD as well.
302 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
303 * --user fix. Only use the user as group if no group is specified.
304 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
306 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
307 * Windows service (re-)integration
311 * --install[:service_name]
312 * --uninstall[:service_name]
315 * They work as follows:
316 * --install will create a service for you and then terminate.
317 * By default the service name will be "privoxy" (without the quotes).
318 * However you can run multiple services if you wish, just by adding
319 * a colon and then a name (no spaces).
321 * --uninstall follows the exact same rules a --install.
323 * --service is used when the program is executed by the service
324 * control manager, and in normal circumstances would never be
325 * used as a command line argument.
327 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
328 * Windows service integration
330 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
331 * Incorporate Fabian Keil's patch work:
332 http://www.fabiankeil.de/sourcecode/privoxy/
334 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
335 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
336 * with what was really the latest development (the v_3_0_branch branch)
338 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
339 * Thanks to Jindrich Makovicka for a race condition fix for the log
340 * file. The race condition remains for non-pthread implementations.
341 * Reference patch #1175720.
343 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
344 * Add the ability to check jpeg images for invalid
345 * lengths of comment blocks. Defensive strategy
346 * against the exploit:
347 * Microsoft Security Bulletin MS04-028
348 * Buffer Overrun in JPEG Processing (GDI+) Could
349 * Allow Code Execution (833987)
350 * Enabled with +inspect-jpegs in actions files.
352 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
353 * - Fixed usage info for non-unix platforms
354 * - Fixed small cmdline parsing bug
356 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
357 * Diagnostics: Now preserve the returncode of pthread_create
358 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
360 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
361 * No longer ignore SIGCHLD. Fixes bug #769381
363 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
364 * Close jarfile on graceful exit, remove stray line
366 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
367 * Cosmetics: Killed a warning, a typo and an allocation left at exit
369 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
370 * No longer rely on non-POSIX.1 extensions of getcwd().
373 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
374 * Replaced setenv() by posix-compliant putenv()
375 * Thanks to Neil McCalden (nmcc AT users.sf.net).
377 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
378 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
380 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
381 * Clean-up and extension of improvements for forked mode:
382 * - Child's return code now consists of flags RC_FLAG_*
383 * - Reporting toggle to parent now properly #ifdef'ed
384 * - Children now report blocking to parent. This enables
385 * statistics in forked mode
387 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
388 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
389 * Children now report having been toggled through _exit(17), parents
390 * watch for that code and toggle themselves if found.
392 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
393 * Wrapping all *_r functions (the non-_r versions of them) with
394 * mutex semaphores for OSX. Hopefully this will take care of all
395 * of those pesky crash reports.
397 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
398 * Fixed two mostly harmless mem leaks
400 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
401 * Fix: Head of global clients list now initialized to NULL
403 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
404 * Added basic support for OPTIONS and TRACE HTTP methods:
405 * - New interceptor direct_response() added in chat().
406 * - sed() moved to earlier in the process, so that the
407 * Host: header is evaluated before actions and forwarding
410 * Revision 1.92 2002/05/08 16:00:46 oes
411 * Chat's buffer handling:
412 * - Fixed bug with unchecked out-of-mem conditions
413 * while reading client request & server headers
414 * - No longer predict if the buffer limit will be exceeded
415 * in the next read -- check add_to_iob's new
416 * return code. If buffer couldn't be extended
417 * (policy or out-of-mem) while
418 * - reading from client: abort
419 * - reading server headers: send error page
420 * - buffering server body for filter: flush,
421 * and if that fails: send error page
423 * Revision 1.91 2002/04/08 20:35:58 swa
426 * Revision 1.90 2002/04/02 14:57:28 oes
427 * Made sending wafers independent of FEATURE_COOKIE_JAR
429 * Revision 1.89 2002/03/31 17:18:59 jongfoster
430 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
432 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
433 * More compiler warning message maintenance
435 * Revision 1.87 2002/03/26 22:29:54 swa
436 * we have a new homepage!
438 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
439 * Workaround for closing the jarfile before load_config() comes around again
441 * Revision 1.85 2002/03/24 15:23:33 jongfoster
444 * Revision 1.84 2002/03/24 13:25:43 swa
445 * name change related issues
447 * Revision 1.83 2002/03/16 23:54:06 jongfoster
448 * Adding graceful termination feature, to help look for memory leaks.
449 * If you enable this (which, by design, has to be done by hand
450 * editing config.h) and then go to http://i.j.b/die, then the program
451 * will exit cleanly after the *next* request. It should free all the
452 * memory that was used.
454 * Revision 1.82 2002/03/13 00:27:05 jongfoster
457 * Revision 1.81 2002/03/12 01:42:50 oes
458 * Introduced modular filters
460 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
461 * OS/2 port maintenance:
462 * - Fixed EMX build - it had decayed a little
463 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
464 * substituted a memset for now.
466 * Revision 1.79 2002/03/09 20:03:52 jongfoster
467 * - Making various functions return int rather than size_t.
468 * (Undoing a recent change). Since size_t is unsigned on
469 * Windows, functions like read_socket that return -1 on
470 * error cannot return a size_t.
472 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
473 * crashes, and also frequently caused JB to jump to 100%
474 * CPU and stay there. (Because it thought it had just
475 * read ((unsigned)-1) == 4Gb of data...)
477 * - The signature of write_socket has changed, it now simply
478 * returns success=0/failure=nonzero.
480 * - Trying to get rid of a few warnings --with-debug on
481 * Windows, I've introduced a new type "jb_socket". This is
482 * used for the socket file descriptors. On Windows, this
483 * is SOCKET (a typedef for unsigned). Everywhere else, it's
484 * an int. The error value can't be -1 any more, so it's
485 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
486 * Windows it maps to the #define INVALID_SOCKET.)
488 * - The signature of bind_port has changed.
490 * Revision 1.78 2002/03/08 21:35:04 oes
491 * Added optional group supplement to --user option. Will now use default group of user if no group given
493 * Revision 1.77 2002/03/07 03:52:06 oes
494 * - Fixed compiler warnings etc
495 * - Improved handling of failed DNS lookups
497 * Revision 1.76 2002/03/06 22:54:35 jongfoster
498 * Automated function-comment nitpicking.
500 * Revision 1.75 2002/03/06 10:02:19 oes
501 * Fixed stupid bug when --user was not given
503 * Revision 1.74 2002/03/06 00:49:31 jongfoster
504 * Fixing warning on Windows
505 * Making #ifdefs that refer to the same variable consistently
506 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
508 * Revision 1.73 2002/03/05 23:57:30 hal9
509 * Stray character 's' on line 1618 was breaking build.
511 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
512 * - Re-enable OS/2 building after new parms were added
513 * - Fix false out of memory report when resolving CGI templates when no IP
514 * address is available of failed attempt (a la no such domain)
516 * Revision 1.71 2002/03/05 18:13:56 oes
517 * Added --user option
519 * Revision 1.70 2002/03/05 04:52:42 oes
520 * Deleted non-errlog debugging code
522 * Revision 1.69 2002/03/04 23:50:00 jongfoster
523 * Splitting off bind_port() call into bind_port_helper(), with
526 * Revision 1.68 2002/03/04 20:17:32 oes
529 * Revision 1.67 2002/03/04 18:18:57 oes
530 * - Removed _DEBUG mode
531 * - Cleand up cmdline parsing
532 * - Introduced --no-daemon, --pidfile options
533 * - Cleaned up signal handling:
534 * - Terminate cleanly on INT, TERM and ABRT
535 * - Schedule logfile for re-opening on HUP
536 * - Ignore CHLD and PIPE
537 * - Leave the rest with their default handlers
538 * - Uniform handler registration
539 * - Added usage() function
540 * - Played styleguide police
542 * Revision 1.66 2002/03/03 15:06:55 oes
543 * Re-enabled automatic config reloading
545 * Revision 1.65 2002/03/03 14:49:11 oes
546 * Fixed CLF logging: Now uses client's original HTTP request
548 * Revision 1.64 2002/03/03 09:18:03 joergs
549 * Made jumbjuster work on AmigaOS again.
551 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
552 * Clean up a little CRLF unpleasantness that suddenly appeared
554 * Revision 1.62 2002/02/20 23:17:23 jongfoster
555 * Detecting some out-of memory conditions and exiting with a log message.
557 * Revision 1.61 2002/01/17 21:01:52 jongfoster
558 * Moving all our URL and URL pattern parsing code to urlmatch.c.
560 * Revision 1.60 2001/12/30 14:07:32 steudten
561 * - Add signal handling (unix)
562 * - Add SIGHUP handler (unix)
563 * - Add creation of pidfile (unix)
564 * - Add action 'top' in rc file (RH)
565 * - Add entry 'SIGNALS' to manpage
566 * - Add exit message to logfile (unix)
568 * Revision 1.59 2001/12/13 14:07:18 oes
569 * Fixed Bug: 503 error page now sent OK
571 * Revision 1.58 2001/11/30 23:37:24 jongfoster
572 * Renaming the Win32 config file to config.txt - this is almost the
573 * same as the corresponding UNIX name "config"
575 * Revision 1.57 2001/11/16 00:47:43 jongfoster
576 * Changing the tty-disconnection code to use setsid().
578 * Revision 1.56 2001/11/13 20:20:54 jongfoster
579 * Tabs->spaces, fixing a bug with missing {} around an if()
581 * Revision 1.55 2001/11/13 20:14:53 jongfoster
582 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
584 * Revision 1.54 2001/11/07 00:03:14 steudten
585 * Give reliable return value if an error
586 * occurs not just 0 with new daemon mode.
588 * Revision 1.53 2001/11/05 21:41:43 steudten
589 * Add changes to be a real daemon just for unix os.
590 * (change cwd to /, detach from controlling tty, set
591 * process group and session leader to the own process.
593 * Add some fatal-error log message for failed malloc().
594 * Add '-d' if compiled with 'configure --with-debug' to
595 * enable debug output.
597 * Revision 1.52 2001/10/26 20:11:20 jongfoster
598 * Fixing type mismatch
600 * Revision 1.51 2001/10/26 17:38:28 oes
603 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
604 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
605 * threads to call select() simultaneously. So, it's time to do a real, live,
606 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
607 * (native). Both versions will work, but using __OS2__ offers multi-threading.
609 * Revision 1.49 2001/10/23 21:41:35 jongfoster
610 * Added call to initialize the (statically-allocated of course)
611 * "out of memory" CGI response.
613 * Revision 1.48 2001/10/10 19:56:46 jongfoster
614 * Moving some code that wasn't cookie-related out of an #ifdef
617 * Revision 1.47 2001/10/10 16:44:36 oes
618 * Added CONNECT destination port limitation check
620 * Revision 1.46 2001/10/08 15:17:41 oes
621 * Re-enabled SSL forwarding
623 * Revision 1.45 2001/10/07 15:42:11 oes
624 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
626 * Moved downgrading of the HTTP version from parse_http_request to
627 * chat(), since we can't decide if it is necessary before we have
628 * determined the actions for the URL. The HTTP command is now
629 * *always* re-built so the repairs need no longer be special-cased.
631 * filter_popups now gets a csp pointer so it can raise the new
632 * CSP_FLAG_MODIFIED flag.
636 * Added configurable size limit for the IOB. If the IOB grows so
637 * large that the next read would exceed the limit, the header
638 * is generated, and the header & unfiltered buffer are flushed
639 * to the client. Chat then continues in non-buffering,
640 * non-filtering body mode.
642 * Revision 1.44 2001/10/02 18:13:57 oes
645 * Revision 1.43 2001/10/02 15:32:13 oes
646 * Moved generation of hdr
648 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
649 * Cleaning up 2 compiler warnings on OS/2.
651 * Revision 1.41 2001/09/16 17:05:14 jongfoster
652 * Removing unused #include showarg.h
654 * Revision 1.40 2001/09/16 15:41:45 jongfoster
655 * Fixing signed/unsigned comparison warning.
657 * Revision 1.39 2001/09/16 13:21:27 jongfoster
658 * Changes to use new list functions.
660 * Revision 1.38 2001/09/16 13:01:46 jongfoster
661 * Removing redundant function call that zeroed zalloc()'d memory.
663 * Revision 1.37 2001/09/10 11:12:24 oes
664 * Deleted unused variable
666 * Revision 1.36 2001/09/10 10:56:15 oes
667 * Silenced compiler warnings
669 * Revision 1.35 2001/07/31 14:44:22 oes
670 * Deleted unused size parameter from filter_popups()
672 * Revision 1.34 2001/07/30 22:08:36 jongfoster
673 * Tidying up #defines:
674 * - All feature #defines are now of the form FEATURE_xxx
675 * - Permanently turned off WIN_GUI_EDIT
676 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
678 * Revision 1.33 2001/07/29 19:32:00 jongfoster
679 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
681 * Revision 1.32 2001/07/29 18:47:05 jongfoster
682 * Adding missing #include "loadcfg.h"
684 * Revision 1.31 2001/07/29 12:17:48 oes
685 * Applied pthread fix by Paul Lieverse
687 * Revision 1.30 2001/07/25 22:57:13 jongfoster
688 * __BEOS__ no longer overrides FEATURE_PTHREAD.
689 * This is because FEATURE_PTHREAD will soon be widely used, so I
690 * want to keep it simple.
692 * Revision 1.29 2001/07/24 12:47:06 oes
693 * Applied BeOS support update by Eugenia
695 * Revision 1.28 2001/07/23 13:26:12 oes
696 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
698 * Revision 1.27 2001/07/19 19:09:47 haroon
699 * - Added code to take care of the situation where while processing the first
700 * server response (which includes the server header), after finding the end
701 * of the headers we were not looking past the end of the headers for
702 * content modification. I enabled it for filter_popups.
703 * Someone else should look to see if other similar operations should be
704 * done to the discarded portion of the buffer.
706 * Note 2001/07/20: No, the other content modification mechanisms will process
707 * the whole iob later anyway. --oes
709 * Revision 1.26 2001/07/18 12:31:36 oes
712 * Revision 1.25 2001/07/15 19:43:49 jongfoster
713 * Supports POSIX threads.
714 * Also removed some unused #includes.
716 * Revision 1.24 2001/07/13 14:00:40 oes
717 * - Generic content modification scheme:
718 * Each feature has its own applicability flag that is set
719 * from csp->action->flags.
720 * Replaced the "filtering" int flag , by a function pointer
721 * "content_filter" to the function that will do the content
722 * modification. If it is != NULL, the document will be buffered
723 * and processed through *content_filter, which must set
724 * csp->content_length and return a modified copy of the body
725 * or return NULL (on failiure).
726 * - Changed csp->is_text to the more generic bitmap csp->content_type
727 * which can currently take the valued CT_TEXT or CT_GIF
729 * - Removed all #ifdef PCRS
731 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
732 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
733 * the `block_acl' call. This prevents a compilation error when the user
734 * does not wish to use the "ACL" feature.
736 * Revision 1.22 2001/06/29 21:45:41 oes
737 * Indentation, CRLF->LF, Tab-> Space
739 * Revision 1.21 2001/06/29 13:29:36 oes
740 * - Cleaned up, improved comments
741 * - Unified all possible interceptors (CGI,
742 * block, trust, fast_redirect) in one
743 * place, with one (CGI) answer generation
744 * mechansim. Much clearer now.
745 * - Removed the GIF image generation, which
746 * is now done in filters.c:block_url()
747 * - Made error conditions like domain lookup
748 * failiure or (various) problems while talking
749 * to the server use cgi.c:error_response()
750 * instead of generating HTML/HTTP in chat() (yuck!)
751 * - Removed logentry from cancelled commit
753 * Revision 1.20 2001/06/09 10:55:28 jongfoster
754 * Changing BUFSIZ ==> BUFFER_SIZE
756 * Revision 1.19 2001/06/07 23:12:52 jongfoster
757 * Replacing function pointer in struct gateway with a directly
758 * called function forwarded_connect().
759 * Replacing struct gateway with struct forward_spec
761 * Revision 1.18 2001/06/03 19:12:16 oes
762 * introduced new cgi handling
764 * Revision 1.17 2001/06/01 20:07:23 jongfoster
765 * Now uses action +image-blocker{} rather than config->tinygif
767 * Revision 1.16 2001/06/01 18:49:17 jongfoster
768 * Replaced "list_share" with "list" - the tiny memory gain was not
769 * worth the extra complexity.
771 * Revision 1.15 2001/05/31 21:24:47 jongfoster
772 * Changed "permission" to "action" throughout.
773 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
774 * Moved vanilla wafer check into chat(), since we must now
775 * decide whether or not to add it based on the URL.
777 * Revision 1.14 2001/05/29 20:14:01 joergs
778 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
781 * Revision 1.13 2001/05/29 09:50:24 jongfoster
782 * Unified blocklist/imagelist/permissionslist.
783 * File format is still under discussion, but the internal changes
786 * Also modified interceptor behaviour:
787 * - We now intercept all URLs beginning with one of the following
788 * prefixes (and *only* these prefixes):
790 * * http://ijbswa.sf.net/config/
791 * * http://ijbswa.sourceforge.net/config/
792 * - New interceptors "home page" - go to http://i.j.b/ to see it.
793 * - Internal changes so that intercepted and fast redirect pages
794 * are not replaced with an image.
795 * - Interceptors now have the option to send a binary page direct
796 * to the client. (i.e. ijb-send-banner uses this)
797 * - Implemented show-url-info interceptor. (Which is why I needed
798 * the above interceptors changes - a typical URL is
799 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
800 * The previous mechanism would not have intercepted that, and
801 * if it had been intercepted then it then it would have replaced
804 * Revision 1.12 2001/05/27 22:17:04 oes
806 * - re_process_buffer no longer writes the modified buffer
807 * to the client, which was very ugly. It now returns the
808 * buffer, which it is then written by chat.
810 * - content_length now adjusts the Content-Length: header
811 * for modified documents rather than crunch()ing it.
812 * (Length info in csp->content_length, which is 0 for
813 * unmodified documents)
815 * - For this to work, sed() is called twice when filtering.
817 * Revision 1.11 2001/05/26 17:27:53 jongfoster
818 * Added support for CLF and fixed LOG_LEVEL_LOG.
819 * Also did CRLF->LF fix of my previous patch.
821 * Revision 1.10 2001/05/26 15:26:15 jongfoster
822 * ACL feature now provides more security by immediately dropping
823 * connections from untrusted hosts.
825 * Revision 1.9 2001/05/26 00:28:36 jongfoster
826 * Automatic reloading of config file.
827 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
828 * Most of the global variables have been moved to a new
829 * struct configuration_spec, accessed through csp->config->globalname
830 * Most of the globals remaining are used by the Win32 GUI.
832 * Revision 1.8 2001/05/25 22:43:18 jongfoster
833 * Fixing minor memory leak and buffer overflow.
835 * Revision 1.7 2001/05/25 22:34:30 jongfoster
838 * Revision 1.6 2001/05/23 00:13:58 joergs
839 * AmigaOS support fixed.
841 * Revision 1.5 2001/05/22 18:46:04 oes
843 * - Enabled filtering banners by size rather than URL
844 * by adding patterns that replace all standard banner
845 * sizes with the "Junkbuster" gif to the re_filterfile
847 * - Enabled filtering WebBugs by providing a pattern
848 * which kills all 1x1 images
850 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
851 * which is selected by the (nonstandard and therefore
852 * capital) letter 'U' in the option string.
853 * It causes the quantifiers to be ungreedy by default.
854 * Appending a ? turns back to greedy (!).
856 * - Added a new interceptor ijb-send-banner, which
857 * sends back the "Junkbuster" gif. Without imagelist or
858 * MSIE detection support, or if tinygif = 1, or the
859 * URL isn't recognized as an imageurl, a lame HTML
860 * explanation is sent instead.
862 * - Added new feature, which permits blocking remote
863 * script redirects and firing back a local redirect
865 * The feature is conditionally compiled, i.e. it
866 * can be disabled with --disable-fast-redirects,
867 * plus it must be activated by a "fast-redirects"
868 * line in the config file, has its own log level
869 * and of course wants to be displayed by show-proxy-args
870 * Note: Boy, all the #ifdefs in 1001 locations and
871 * all the fumbling with configure.in and acconfig.h
872 * were *way* more work than the feature itself :-(
874 * - Because a generic redirect template was needed for
875 * this, tinygif = 3 now uses the same.
877 * - Moved GIFs, and other static HTTP response templates
882 * - Removed some >400 CRs again (Jon, you really worked
885 * Revision 1.4 2001/05/21 19:34:01 jongfoster
886 * Made failure to bind() a fatal error.
888 * Revision 1.3 2001/05/20 01:21:20 jongfoster
889 * Version 2.9.4 checkin.
890 * - Merged popupfile and cookiefile, and added control over PCRS
891 * filtering, in new "permissionsfile".
892 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
893 * file error you now get a message box (in the Win32 GUI) rather
894 * than the program exiting with no explanation.
895 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
897 * - Removed tabs from "config"
898 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
899 * - Bumped up version number.
901 * Revision 1.2 2001/05/17 22:34:44 oes
902 * - Added hint on GIF char array generation to jcc.c
903 * - Cleaned CRLF's from the sources and related files
904 * - Repaired logging for REF and FRC
906 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
907 * Initial import of version 2.9.3 source tree
910 *********************************************************************/
916 #include <sys/types.h>
925 # ifndef FEATURE_PTHREAD
929 # include <windows.h>
930 # include <process.h>
931 # endif /* ndef FEATURE_PTHREAD */
934 # ifndef _WIN_CONSOLE
936 # endif /* ndef _WIN_CONSOLE */
937 # include "w32svrapi.h"
939 #else /* ifndef _WIN32 */
941 # if !defined (__OS2__)
943 # include <sys/wait.h>
944 # endif /* ndef __OS2__ */
945 # include <sys/time.h>
946 # include <sys/stat.h>
947 # include <sys/ioctl.h>
950 #include <sys/termios.h>
961 # include <socket.h> /* BeOS has select() for sockets only. */
962 # include <OS.h> /* declarations for threads and stuff. */
965 # if defined(__EMX__) || defined(__OS2__)
966 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
971 #define bzero(B,N) memset(B,0x00,n)
986 #include "killpopup.h"
987 #include "miscutil.h"
989 #include "jbsockets.h"
994 #include "urlmatch.h"
996 const char jcc_h_rcs[] = JCC_H_VERSION;
997 const char project_h_rcs[] = PROJECT_H_VERSION;
1000 struct client_state clients[1];
1001 struct file_list files[1];
1003 #ifdef FEATURE_STATISTICS
1004 int urls_read = 0; /* total nr of urls read inc rejected */
1005 int urls_rejected = 0; /* total nr of urls rejected */
1006 #endif /* def FEATURE_STATISTICS */
1008 #ifdef FEATURE_GRACEFUL_TERMINATION
1009 int g_terminate = 0;
1012 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1013 static void sig_handler(int the_signal);
1015 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1016 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1017 static jb_err get_server_headers(struct client_state *csp);
1018 static const char *crunch_reason(const struct http_response *rsp);
1019 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1021 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1023 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1024 static jb_err change_request_destination(struct client_state *csp);
1025 static void chat(struct client_state *csp);
1026 static void serve(struct client_state *csp);
1028 static void usage(const char *myname);
1030 static void initialize_mutexes(void);
1031 static jb_socket bind_port_helper(struct configuration_spec *config);
1032 static void listen_loop(void);
1035 void serve(struct client_state *csp);
1036 #else /* ifndef AMIGA */
1037 static void serve(struct client_state *csp);
1038 #endif /* def AMIGA */
1041 static int32 server_thread(void *data);
1042 #endif /* def __BEOS__ */
1045 #define sleep(N) Sleep(((N) * 1000))
1049 #define sleep(N) DosSleep(((N) * 100))
1052 #ifdef FEATURE_PTHREAD
1053 pthread_mutex_t log_mutex;
1054 pthread_mutex_t log_init_mutex;
1056 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1057 pthread_mutex_t resolver_mutex;
1058 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1060 #ifndef HAVE_GMTIME_R
1061 pthread_mutex_t gmtime_mutex;
1062 #endif /* ndef HAVE_GMTIME_R */
1064 #ifndef HAVE_LOCALTIME_R
1065 pthread_mutex_t localtime_mutex;
1066 #endif /* ndef HAVE_GMTIME_R */
1069 pthread_mutex_t rand_mutex;
1070 #endif /* ndef HAVE_RANDOM */
1072 #endif /* FEATURE_PTHREAD */
1074 #if defined(unix) || defined(__EMX__)
1075 const char *basedir = NULL;
1076 const char *pidfile = NULL;
1077 int received_hup_signal = 0;
1078 #endif /* defined unix */
1080 /* HTTP snipplets. */
1081 static const char CSUCCEED[] =
1082 "HTTP/1.0 200 Connection established\n"
1083 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1085 static const char CHEADER[] =
1086 "HTTP/1.0 400 Invalid header received from browser\r\n"
1087 "Proxy-Agent: Privoxy " VERSION "\r\n"
1088 "Content-Type: text/plain\r\n"
1089 "Connection: close\r\n\r\n"
1090 "Invalid header received from browser.\r\n";
1092 static const char CFORBIDDEN[] =
1093 "HTTP/1.0 403 Connection not allowable\r\n"
1094 "Proxy-Agent: Privoxy " VERSION "\r\n"
1095 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1096 "Connection: close\r\n\r\n";
1098 static const char FTP_RESPONSE[] =
1099 "HTTP/1.0 400 Invalid request received from browser\r\n"
1100 "Content-Type: text/plain\r\n"
1101 "Connection: close\r\n\r\n"
1102 "Invalid request. Privoxy doesn't support FTP.\r\n";
1104 static const char GOPHER_RESPONSE[] =
1105 "HTTP/1.0 400 Invalid request received from browser\r\n"
1106 "Content-Type: text/plain\r\n"
1107 "Connection: close\r\n\r\n"
1108 "Invalid request. Privoxy doesn't support gopher.\r\n";
1110 /* XXX: should be a template */
1111 static const char MISSING_DESTINATION_RESPONSE[] =
1112 "HTTP/1.0 400 Bad request received from browser\r\n"
1113 "Proxy-Agent: Privoxy " VERSION "\r\n"
1114 "Content-Type: text/plain\r\n"
1115 "Connection: close\r\n\r\n"
1116 "Bad request. Privoxy was unable to extract the destination.\r\n";
1118 /* XXX: should be a template */
1119 static const char NO_SERVER_DATA_RESPONSE[] =
1120 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1121 "Proxy-Agent: Privoxy " VERSION "\r\n"
1122 "Content-Type: text/plain\r\n"
1123 "Connection: close\r\n\r\n"
1124 "Empty server or forwarder response.\r\n"
1125 "The connection was closed without sending any data.\r\n";
1128 /* XXX: should be a template */
1129 static const char NULL_BYTE_RESPONSE[] =
1130 "HTTP/1.0 400 Bad request received from browser\r\n"
1131 "Proxy-Agent: Privoxy " VERSION "\r\n"
1132 "Content-Type: text/plain\r\n"
1133 "Connection: close\r\n\r\n"
1134 "Bad request. Null byte(s) before end of request.\r\n";
1137 /* XXX: should be a template */
1138 static const char MESSED_UP_REQUEST_RESPONSE[] =
1139 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1140 "Proxy-Agent: Privoxy " VERSION "\r\n"
1141 "Content-Type: text/plain\r\n"
1142 "Connection: close\r\n\r\n"
1143 "Bad request. Messed up with header filters.\r\n";
1145 /* A function to crunch a response */
1146 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1148 /* Crunch function flags */
1149 #define CF_NO_FLAGS 0
1150 /* Cruncher applies to forced requests as well */
1151 #define CF_IGNORE_FORCE 1
1152 /* Crunched requests are counted for the block statistics */
1153 #define CF_COUNT_AS_REJECT 2
1155 /* A crunch function and its flags */
1158 const crunch_func_ptr cruncher;
1162 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1164 /* Complete list of cruncher functions */
1165 static const struct cruncher crunchers_all[] = {
1166 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1167 { block_url, CF_COUNT_AS_REJECT },
1168 #ifdef FEATURE_TRUST
1169 { trust_url, CF_COUNT_AS_REJECT },
1170 #endif /* def FEATURE_TRUST */
1171 { redirect_url, CF_NO_FLAGS },
1172 { dispatch_cgi, CF_IGNORE_FORCE},
1176 /* Light version, used after tags are applied */
1177 static const struct cruncher crunchers_light[] = {
1178 { block_url, CF_COUNT_AS_REJECT },
1179 { redirect_url, CF_NO_FLAGS },
1184 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1185 /*********************************************************************
1187 * Function : sig_handler
1189 * Description : Signal handler for different signals.
1190 * Exit gracefully on TERM and INT
1191 * or set a flag that will cause the errlog
1192 * to be reopened by the main thread on HUP.
1195 * 1 : the_signal = the signal cause this function to call
1199 *********************************************************************/
1200 static void sig_handler(int the_signal)
1206 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1217 received_hup_signal = 1;
1222 * We shouldn't be here, unless we catch signals
1223 * in main() that we can't handle here!
1225 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1233 /*********************************************************************
1235 * Function : client_protocol_is_unsupported
1237 * Description : Checks if the client used a known unsupported
1238 * protocol and deals with it by sending an error
1242 * 1 : csp = Current client state (buffers, headers, etc...)
1243 * 2 : req = the first request line send by the client
1245 * Returns : TRUE if an error response has been generated, or
1246 * FALSE if the request doesn't look invalid.
1248 *********************************************************************/
1249 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1251 char buf[BUFFER_SIZE];
1254 * If it's a FTP or gopher request, we don't support it.
1256 * These checks are better than nothing, but they might
1257 * not work in all configurations and some clients might
1258 * have problems digesting the answer.
1260 * They should, however, never cause more problems than
1261 * Privoxy's old behaviour (returning the misleading HTML
1264 * "Could not resolve http://(ftp|gopher)://example.org").
1266 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1268 if (!strncmpic(req, "GET ftp://", 10))
1270 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1271 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1272 csp->ip_addr_str, req);
1276 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1277 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1278 csp->ip_addr_str, req);
1280 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1282 write_socket(csp->cfd, buf, strlen(buf));
1291 /*********************************************************************
1293 * Function : get_request_destination_elsewhere
1295 * Description : If the client's request was redirected into
1296 * Privoxy without the client's knowledge,
1297 * the request line lacks the destination host.
1299 * This function tries to get it elsewhere,
1300 * provided accept-intercepted-requests is enabled.
1302 * "Elsewhere" currently only means "Host: header",
1303 * but in the future we may ask the redirecting
1304 * packet filter to look the destination up.
1306 * If the destination stays unknown, an error
1307 * response is send to the client and headers
1308 * are freed so that chat() can return directly.
1311 * 1 : csp = Current client state (buffers, headers, etc...)
1312 * 2 : headers = a header list
1314 * Returns : JB_ERR_OK if the destination is now known, or
1315 * JB_ERR_PARSE if it isn't.
1317 *********************************************************************/
1318 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1322 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1324 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1325 " Privoxy isn't configured to accept intercepted requests.",
1326 csp->ip_addr_str, csp->http->cmd);
1327 /* XXX: Use correct size */
1328 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1329 csp->ip_addr_str, csp->http->cmd);
1331 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1332 destroy_list(headers);
1334 return JB_ERR_PARSE;
1336 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1338 /* Split the domain we just got for pattern matching */
1339 init_domain_components(csp->http);
1345 /* We can't work without destination. Go spread the news.*/
1347 req = list_to_text(headers);
1349 /* XXX: Use correct size */
1350 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1351 csp->ip_addr_str, csp->http->cmd);
1352 log_error(LOG_LEVEL_ERROR,
1353 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1354 csp->ip_addr_str, csp->http->cmd, req);
1357 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1358 destroy_list(headers);
1360 return JB_ERR_PARSE;
1363 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1364 * to get the destination IP address, use it as host directly
1365 * or do a reverse DNS lookup first.
1370 /*********************************************************************
1372 * Function : get_server_headers
1374 * Description : Parses server headers in iob and fills them
1375 * into csp->headers so that they can later be
1379 * 1 : csp = Current client state (buffers, headers, etc...)
1381 * Returns : JB_ERR_OK if everything went fine, or
1382 * JB_ERR_PARSE if the headers were incomplete.
1384 *********************************************************************/
1385 static jb_err get_server_headers(struct client_state *csp)
1387 int continue_hack_in_da_house = 0;
1390 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1395 * continue hack in da house. Ignore the ending of
1396 * this head and continue enlisting header lines.
1397 * The reason is described below.
1399 enlist(csp->headers, "");
1400 continue_hack_in_da_house = 0;
1403 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1406 * It's a bodyless continue response, don't
1407 * stop header parsing after reaching it's end.
1409 * As a result Privoxy will concatenate the
1410 * next response's head and parse and deliver
1411 * the headers as if they belonged to one request.
1413 * The client will separate them because of the
1414 * empty line between them.
1416 * XXX: What we're doing here is clearly against
1417 * the intended purpose of the continue header,
1418 * and under some conditions (HTTP/1.0 client request)
1419 * it's a standard violation.
1421 * Anyway, "sort of against the spec" is preferable
1422 * to "always getting confused by Continue responses"
1423 * (Privoxy's behaviour before this hack was added)
1425 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1426 continue_hack_in_da_house = 1;
1428 else if (*header == '\0')
1431 * If the header is empty, but the Continue hack
1432 * isn't active, we can assume that we reached the
1433 * end of the buffer before we hit the end of the
1436 * Inform the caller an let it decide how to handle it.
1438 return JB_ERR_PARSE;
1442 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1445 * XXX: Should we quit the request and return a
1446 * out of memory error page instead?
1448 log_error(LOG_LEVEL_ERROR,
1449 "Out of memory while enlisting server headers. %s lost.",
1459 /*********************************************************************
1461 * Function : crunch_reason
1463 * Description : Translates the crunch reason code into a string.
1466 * 1 : rsp = a http_response
1468 * Returns : A string with the crunch reason or an error description.
1470 *********************************************************************/
1471 static const char *crunch_reason(const struct http_response *rsp)
1473 char * reason = NULL;
1475 assert(rsp != NULL);
1478 return "Internal error while searching for crunch reason";
1481 switch (rsp->reason)
1483 case RSP_REASON_UNSUPPORTED:
1484 reason = "Unsupported HTTP feature";
1486 case RSP_REASON_BLOCKED:
1489 case RSP_REASON_UNTRUSTED:
1490 reason = "Untrusted";
1492 case RSP_REASON_REDIRECTED:
1493 reason = "Redirected";
1495 case RSP_REASON_CGI_CALL:
1496 reason = "CGI Call";
1498 case RSP_REASON_NO_SUCH_DOMAIN:
1499 reason = "DNS failure";
1501 case RSP_REASON_FORWARDING_FAILED:
1502 reason = "Forwarding failed";
1504 case RSP_REASON_CONNECT_FAILED:
1505 reason = "Connection failure";
1507 case RSP_REASON_OUT_OF_MEMORY:
1508 reason = "Out of memory (may mask other reasons)";
1511 reason = "No reason recorded";
1519 /*********************************************************************
1521 * Function : send_crunch_response
1523 * Description : Delivers already prepared response for
1524 * intercepted requests, logs the interception
1525 * and frees the response.
1528 * 1 : csp = Current client state (buffers, headers, etc...)
1529 * 1 : rsp = Fully prepared response. Will be freed on exit.
1531 * Returns : Nothing.
1533 *********************************************************************/
1534 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1536 const struct http_request *http = csp->http;
1537 char status_code[4];
1539 assert(rsp != NULL);
1540 assert(rsp->head != NULL);
1545 * Not supposed to happen. If it does
1546 * anyway, treat it as an unknown error.
1548 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1549 /* return code doesn't matter */
1554 /* If rsp is still NULL, we have serious internal problems. */
1555 log_error(LOG_LEVEL_FATAL,
1556 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1560 * Extract the status code from the actual head
1561 * that was send to the client. It is the only
1562 * way to get it right for all requests, including
1563 * the fixed ones for out-of-memory problems.
1565 * A head starts like this: 'HTTP/1.1 200...'
1569 status_code[0] = rsp->head[9];
1570 status_code[1] = rsp->head[10];
1571 status_code[2] = rsp->head[11];
1572 status_code[3] = '\0';
1574 /* Write the answer to the client */
1575 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1576 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1578 /* There is nothing we can do about it. */
1579 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1582 /* Log that the request was crunched and why. */
1583 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1584 http->hostport, http->path, crunch_reason(rsp));
1585 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1586 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1588 /* Clean up and return */
1589 if (cgi_error_memory() != rsp)
1591 free_http_response(rsp);
1598 /*********************************************************************
1600 * Function : request_contains_null_bytes
1602 * Description : Checks for NULL bytes in the request and sends
1603 * an error message to the client if any were found.
1605 * XXX: currently not used, see comment in chat().
1608 * 1 : csp = Current client state (buffers, headers, etc...)
1609 * 2 : buf = Data from the client's request to check.
1610 * 3 : len = The data length.
1612 * Returns : TRUE if the request contained one or more NULL bytes, or
1615 *********************************************************************/
1616 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1618 size_t c_len; /* Request lenght when treated as C string */
1620 c_len = strlen(buf);
1625 * Null byte(s) found. Log the request,
1626 * return an error response and hang up.
1628 size_t tmp_len = c_len;
1633 * Replace NULL byte(s) with '°' characters
1634 * so the request can be logged as string.
1635 * XXX: Is there a better replacement character?
1638 tmp_len += strlen(buf+tmp_len);
1639 } while (tmp_len < len);
1641 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1642 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1643 log_error(LOG_LEVEL_HEADER,
1644 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1646 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1648 /* XXX: Log correct size */
1649 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1659 /*********************************************************************
1661 * Function : crunch_response_triggered
1663 * Description : Checks if the request has to be crunched,
1664 * and delivers the crunch response if necessary.
1667 * 1 : csp = Current client state (buffers, headers, etc...)
1668 * 2 : crunchers = list of cruncher functions to run
1670 * Returns : TRUE if the request was answered with a crunch response
1673 *********************************************************************/
1674 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1676 struct http_response *rsp = NULL;
1677 const struct cruncher *c;
1680 * If CGI request crunching is disabled,
1681 * check the CGI dispatcher out of order to
1682 * prevent unintentional blocks or redirects.
1684 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1685 && (NULL != (rsp = dispatch_cgi(csp))))
1687 /* Deliver, log and free the interception response. */
1688 send_crunch_response(csp, rsp);
1692 for (c = crunchers; c->cruncher != NULL; c++)
1695 * Check the cruncher if either Privoxy is toggled
1696 * on and the request isn't forced, or if the cruncher
1697 * applies to forced requests as well.
1699 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1700 !(csp->flags & CSP_FLAG_FORCED)) ||
1701 (c->flags & CF_IGNORE_FORCE))
1703 rsp = c->cruncher(csp);
1706 /* Deliver, log and free the interception response. */
1707 send_crunch_response(csp, rsp);
1708 #ifdef FEATURE_STATISTICS
1709 if (c->flags & CF_COUNT_AS_REJECT)
1711 csp->flags |= CSP_FLAG_REJECTED;
1713 #endif /* def FEATURE_STATISTICS */
1724 /*********************************************************************
1726 * Function : build_request_line
1728 * Description : Builds the HTTP request line.
1730 * If a HTTP forwarder is used it expects the whole URL,
1731 * web servers only get the path.
1734 * 1 : csp = Current client state (buffers, headers, etc...)
1735 * 2 : fwd = The forwarding spec used for the request
1736 * XXX: Should use http->fwd instead.
1737 * 3 : request_line = The old request line which will be replaced.
1739 * Returns : Nothing. Terminates in case of memory problems.
1741 *********************************************************************/
1742 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1744 struct http_request *http = csp->http;
1746 assert(http->ssl == 0);
1749 * Downgrade http version from 1.1 to 1.0
1750 * if +downgrade action applies.
1752 if ( (csp->action->flags & ACTION_DOWNGRADE)
1753 && (!strcmpic(http->ver, "HTTP/1.1")))
1756 http->ver = strdup("HTTP/1.0");
1758 if (http->ver == NULL)
1760 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1765 * Rebuild the request line.
1767 freez(*request_line);
1768 *request_line = strdup(http->gpc);
1769 string_append(request_line, " ");
1771 if (fwd->forward_host)
1773 string_append(request_line, http->url);
1777 string_append(request_line, http->path);
1779 string_append(request_line, " ");
1780 string_append(request_line, http->ver);
1782 if (*request_line == NULL)
1784 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1786 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1790 /*********************************************************************
1792 * Function : change_request_destination
1794 * Description : Parse a (rewritten) request line and regenerate
1795 * the http request data.
1798 * 1 : csp = Current client state (buffers, headers, etc...)
1800 * Returns : Forwards the parse_http_request() return code.
1801 * Terminates in case of memory problems.
1803 *********************************************************************/
1804 static jb_err change_request_destination(struct client_state *csp)
1806 struct http_request *http = csp->http;
1809 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1810 free_http_request(http);
1811 err = parse_http_request(csp->headers->first->str, http, csp);
1812 if (JB_ERR_OK != err)
1814 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1815 jb_err_to_string(err));
1817 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1818 if (http->ocmd == NULL)
1820 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1827 /*********************************************************************
1831 * Description : Once a connection to the client has been accepted,
1832 * this function is called (via serve()) to handle the
1833 * main business of the communication. When this
1834 * function returns, the caller must close the client
1837 * FIXME: chat is nearly thousand lines long.
1841 * 1 : csp = Current client state (buffers, headers, etc...)
1843 * Returns : Nothing.
1845 *********************************************************************/
1846 static void chat(struct client_state *csp)
1848 char buf[BUFFER_SIZE];
1856 int ms_iis5_hack = 0;
1857 size_t byte_count = 0;
1858 int forwarded_connect_retries = 0;
1859 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1860 const struct forward_spec * fwd;
1861 struct http_request *http;
1862 int len; /* for buffer sizes (and negative error codes) */
1864 #ifdef FEATURE_KILL_POPUPS
1865 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1866 #endif /* def FEATURE_KILL_POPUPS */
1868 /* Function that does the content filtering for the current request */
1869 filter_function_ptr content_filter = NULL;
1871 /* Skeleton for HTTP response, if we should intercept the request */
1872 struct http_response *rsp;
1874 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1875 struct list header_list;
1876 struct list *headers = &header_list;
1880 memset(buf, 0, sizeof(buf));
1883 * Read the client's request. Note that since we're not using select() we
1884 * could get blocked here if a client connected, then didn't say anything!
1889 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1891 if (len <= 0) break; /* error! */
1894 * If there is no memory left for buffering the
1895 * request, there is nothing we can do but hang up
1897 if (add_to_iob(csp, buf, len))
1902 req = get_header(csp);
1904 } while ((NULL != req) && ('\0' == *req));
1906 if ((NULL != req) && ('\0' != *req))
1908 /* Request received. Validate and parse it. */
1912 * XXX: Temporary disabled to prevent problems
1913 * with POST requests whose bodies are allowed to
1914 * contain NULL bytes. BR#1730105.
1916 * The main purpose of this check is to properly
1917 * log stuff like BitTorrent traffic and other junk
1918 * that hits public proxies. It's not required for
1919 * Privoxy to functions as those requests are discarded
1922 * It probably should be rewritten to only check
1923 * the head of the request. Another option would
1924 * be to let all POST requests pass, although that
1925 * may not be good enough.
1927 if (request_contains_null_bytes(csp, buf, len))
1929 /* NULL bytes found and dealt with, just hang up. */
1934 /* Does the request line look invalid? */
1935 if (client_protocol_is_unsupported(csp, req))
1938 * Yes. The request has already been
1939 * answered with a error response, the buffers
1940 * were freed and we're done with chatting.
1945 #ifdef FEATURE_FORCE_LOAD
1947 * If this request contains the FORCE_PREFIX and blocks
1948 * aren't enforced, get rid of it and set the force flag.
1950 if (strstr(req, FORCE_PREFIX))
1952 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1954 log_error(LOG_LEVEL_FORCE,
1955 "Ignored force prefix in request: \"%s\".", req);
1959 strclean(req, FORCE_PREFIX);
1960 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
1961 csp->flags |= CSP_FLAG_FORCED;
1965 #endif /* def FEATURE_FORCE_LOAD */
1966 err = parse_http_request(req, http, csp);
1967 if (JB_ERR_OK != err)
1969 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
1975 if (http->cmd == NULL)
1977 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1978 /* XXX: Use correct size */
1979 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1980 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
1982 free_http_request(http);
1986 /* grab the rest of the client's headers */
1990 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
1992 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1995 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2000 * If there is no memory left for buffering the
2001 * request, there is nothing we can do but hang up
2003 if (add_to_iob(csp, buf, len))
2010 if (p == NULL) break;
2017 if (http->host == NULL)
2020 * If we still don't know the request destination,
2021 * the request is invalid or the client uses
2022 * Privoxy without its knowledge.
2024 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2027 * Our attempts to get the request destination
2028 * elsewhere failed or Privoxy is configured
2029 * to only accept proxy requests.
2031 * An error response has already been send
2032 * and we're done here.
2039 * Determine the actions for this URL
2041 #ifdef FEATURE_TOGGLE
2042 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2044 /* Most compatible set of actions (i.e. none) */
2045 init_current_action(csp->action);
2048 #endif /* ndef FEATURE_TOGGLE */
2050 url_actions(http, csp);
2054 * Save a copy of the original request for logging
2056 http->ocmd = strdup(http->cmd);
2058 if (http->ocmd == NULL)
2060 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2063 enlist(csp->headers, http->cmd);
2065 /* Append the previously read headers */
2066 list_append_list_unique(csp->headers, headers);
2067 destroy_list(headers);
2069 err = sed(client_patterns, add_client_headers, csp);
2070 if (JB_ERR_OK != err)
2072 assert(err == JB_ERR_PARSE);
2073 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2075 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2077 /* Check request line for rewrites. */
2078 if ((NULL == csp->headers->first->str)
2079 || (strcmp(http->cmd, csp->headers->first->str) &&
2080 (JB_ERR_OK != change_request_destination(csp))))
2083 * A header filter broke the request line - bail out.
2085 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2086 /* XXX: Use correct size */
2087 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2088 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2090 free_http_request(http);
2094 /* decide how to route the HTTP request */
2095 if (NULL == (fwd = forward_url(http, csp)))
2097 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2098 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2102 * build the http request to send to the server
2103 * we have to do one of the following:
2105 * create = use the original HTTP request to create a new
2106 * HTTP request that has either the path component
2107 * without the http://domainspec (w/path) or the
2108 * full orininal URL (w/url)
2109 * Note that the path and/or the HTTP version may
2110 * have been altered by now.
2112 * connect = Open a socket to the host:port of the server
2113 * and short-circuit server and client socket.
2115 * pass = Pass the request unchanged if forwarding a CONNECT
2116 * request to a parent proxy. Note that we'll be sending
2117 * the CFAIL message ourselves if connecting to the parent
2118 * fails, but we won't send a CSUCCEED message if it works,
2119 * since that would result in a double message (ours and the
2120 * parent's). After sending the request to the parent, we simply
2123 * here's the matrix:
2126 * +--------+--------+
2128 * 0 | create | connect|
2130 * Forwarding +--------+--------+
2132 * 1 | create | pass |
2134 * +--------+--------+
2139 * Check if a CONNECT request is allowable:
2140 * In the absence of a +limit-connect action, allow only port 443.
2141 * If there is an action, allow whatever matches the specificaton.
2145 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
2146 || (csp->action->flags & ACTION_LIMIT_CONNECT
2147 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
2149 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2152 * The response may confuse some clients,
2153 * but makes unblocking easier.
2155 * XXX: It seems to work with all major browsers,
2156 * so we should consider returning a body by default someday ...
2158 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2159 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2160 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2162 csp->action->flags |= ACTION_BLOCK;
2167 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2168 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2169 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2170 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2172 assert(NULL != csp->http->ocmd);
2173 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2175 list_remove_all(csp->headers);
2177 * XXX: For consistency we might want to log a crunch message here.
2186 freez(csp->headers->first->str);
2187 build_request_line(csp, fwd, &csp->headers->first->str);
2190 hdr = list_to_text(csp->headers);
2193 /* FIXME Should handle error properly */
2194 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2198 * We have a request. Check if one of the crunchers wants it.
2200 if (crunch_response_triggered(csp, crunchers_all))
2203 * Yes. The client got the crunch response
2204 * and we are done here after cleaning up.
2207 list_remove_all(csp->headers);
2213 * The headers can't be removed earlier because
2214 * they were still needed for the referrer check
2215 * in case of CGI crunches.
2217 * XXX: Would it be worth to move the referrer check
2218 * into client_referrer() and set a flag if it's trusted?
2220 list_remove_all(csp->headers);
2222 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2224 if (fwd->forward_host)
2226 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2227 fwd->forward_host, fwd->forward_port, http->hostport);
2231 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2234 /* here we connect to the server, gateway, or the forwarder */
2236 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2237 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2239 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2240 forwarded_connect_retries, http->hostport);
2243 if (csp->sfd == JB_INVALID_SOCKET)
2245 if (fwd->type != SOCKS_NONE)
2248 rsp = error_response(csp, "forwarding-failed", errno);
2250 else if (errno == EINVAL)
2252 rsp = error_response(csp, "no-such-domain", errno);
2256 rsp = error_response(csp, "connect-failed", errno);
2257 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2262 /* Write the answer to the client */
2265 send_crunch_response(csp, rsp);
2272 if (fwd->forward_host || (http->ssl == 0))
2274 /* write the client's (modified) header to the server
2275 * (along with anything else that may be in the buffer)
2278 if (write_socket(csp->sfd, hdr, strlen(hdr))
2279 || (flush_socket(csp->sfd, csp) < 0))
2281 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2284 rsp = error_response(csp, "connect-failed", errno);
2288 send_crunch_response(csp, rsp);
2298 * We're running an SSL tunnel and we're not forwarding,
2299 * so just send the "connect succeeded" message to the
2300 * client, flush the rest, and get out of the way.
2302 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2310 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2312 /* we're finished with the client's header */
2315 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2317 /* pass data between the client and server
2318 * until one or the other shuts down the connection.
2327 * FD_ZERO here seems to point to an errant macro which crashes.
2328 * So do this by hand for now...
2330 memset(&rfds,0x00,sizeof(fd_set));
2334 FD_SET(csp->cfd, &rfds);
2335 FD_SET(csp->sfd, &rfds);
2337 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2341 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2345 /* this is the body of the browser's request
2346 * just read it and write it.
2349 if (FD_ISSET(csp->cfd, &rfds))
2351 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2355 break; /* "game over, man" */
2358 if (write_socket(csp->sfd, buf, (size_t)len))
2360 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2367 * The server wants to talk. It could be the header or the body.
2368 * If `hdr' is null, then it's the header otherwise it's the body.
2369 * FIXME: Does `hdr' really mean `host'? No.
2373 if (FD_ISSET(csp->sfd, &rfds))
2376 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2380 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2382 if (http->ssl && (fwd->forward_host == NULL))
2385 * Just hang up. We already confirmed the client's CONNECT
2386 * request with status code 200 and unencrypted content is
2387 * no longer welcome.
2389 log_error(LOG_LEVEL_ERROR,
2390 "CONNECT already confirmed. Unable to tell the client about the problem.");
2393 else if (byte_count)
2396 * Just hang up. We already transmitted the original headers
2397 * and parts of the original content and therefore missed the
2398 * chance to send an error message (without risking data corruption).
2400 * XXX: we could retry with a fancy range request here.
2402 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2403 "Unable to tell the client about the problem.");
2407 rsp = error_response(csp, "connect-failed", errno);
2411 send_crunch_response(csp, rsp);
2417 /* Add a trailing zero. This lets filter_popups
2418 * use string operations.
2422 #ifdef FEATURE_KILL_POPUPS
2423 /* Filter the popups on this read. */
2424 if (block_popups_now)
2426 filter_popups(buf, csp);
2428 #endif /* def FEATURE_KILL_POPUPS */
2430 /* Normally, this would indicate that we've read
2431 * as much as the server has sent us and we can
2432 * close the client connection. However, Microsoft
2433 * in its wisdom has released IIS/5 with a bug that
2434 * prevents it from sending the trailing \r\n in
2435 * a 302 redirect header (and possibly other headers).
2436 * To work around this if we've haven't parsed
2437 * a full header we'll append a trailing \r\n
2438 * and see if this now generates a valid one.
2440 * This hack shouldn't have any impacts. If we've
2441 * already transmitted the header or if this is a
2442 * SSL connection, then we won't bother with this
2443 * hack. So we only work on partially received
2444 * headers. If we append a \r\n and this still
2445 * doesn't generate a valid header, then we won't
2446 * transmit anything to the client.
2451 if (server_body || http->ssl)
2454 * If we have been buffering up the document,
2455 * now is the time to apply content modification
2456 * and send the result to the client.
2460 p = execute_content_filter(csp, content_filter);
2462 * If the content filter fails, use the original
2463 * buffer and length.
2464 * (see p != NULL ? p : csp->iob->cur below)
2468 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2471 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2473 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2476 hdr = list_to_text(csp->headers);
2479 /* FIXME Should handle error properly */
2480 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2484 * Shouldn't happen because this was the second sed run
2485 * and tags are only created for the first one.
2487 assert(!crunch_response_triggered(csp, crunchers_all));
2489 if (write_socket(csp->cfd, hdr, strlen(hdr))
2490 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2492 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2502 break; /* "game over, man" */
2506 * This is NOT the body, so
2507 * Let's pretend the server just sent us a blank line.
2509 snprintf(buf, sizeof(buf), "\r\n");
2510 len = (int)strlen(buf);
2513 * Now, let the normal header parsing algorithm below do its
2514 * job. If it fails, we'll exit instead of continuing.
2521 * If this is an SSL connection or we're in the body
2522 * of the server document, just write it to the client,
2523 * unless we need to buffer the body for later content-filtering
2526 if (server_body || http->ssl)
2531 * If there is no memory left for buffering the content, or the buffer limit
2532 * has been reached, switch to non-filtering mode, i.e. make & write the
2533 * header, flush the iob and buf, and get out of the way.
2535 if (add_to_iob(csp, buf, len))
2540 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2542 hdr = list_to_text(csp->headers);
2546 * Memory is too tight to even generate the header.
2547 * Send our static "Out-of-memory" page.
2549 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2550 rsp = cgi_error_memory();
2551 send_crunch_response(csp, rsp);
2555 hdrlen = strlen(hdr);
2557 if (write_socket(csp->cfd, hdr, hdrlen)
2558 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2559 || (write_socket(csp->cfd, buf, (size_t)len)))
2561 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2568 * Reset the byte_count to the amount of bytes
2569 * we just flushed. len will be added a few lines below,
2570 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2572 byte_count = (size_t)flushed;
2574 content_filter = NULL;
2580 if (write_socket(csp->cfd, buf, (size_t)len))
2582 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2586 byte_count += (size_t)len;
2591 /* we're still looking for the end of the
2592 * server's header ... (does that make header
2593 * parsing an "out of body experience" ?
2597 * buffer up the data we just read. If that fails,
2598 * there's little we can do but send our static
2599 * out-of-memory page.
2601 if (add_to_iob(csp, buf, len))
2603 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2604 rsp = cgi_error_memory();
2605 send_crunch_response(csp, rsp);
2610 /* Convert iob into something sed() can digest */
2611 if (JB_ERR_PARSE == get_server_headers(csp))
2615 /* Well, we tried our MS IIS/5
2616 * hack and it didn't work.
2617 * The header is incomplete
2618 * and there isn't anything
2619 * we can do about it.
2625 /* Since we have to wait for
2626 * more from the server before
2627 * we can parse the headers
2628 * we just continue here.
2634 /* Did we actually get anything? */
2635 if (NULL == csp->headers->first)
2637 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2638 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2639 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2640 free_http_request(http);
2644 /* we have now received the entire header.
2645 * filter it and send the result to the client
2647 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2649 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2651 hdr = list_to_text(csp->headers);
2654 /* FIXME Should handle error properly */
2655 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2658 if (crunch_response_triggered(csp, crunchers_light))
2661 * One of the tags created by a server-header
2662 * tagger triggered a crunch. We already
2663 * delivered the crunch response to the client
2664 * and are done here after cleaning up.
2669 /* Buffer and pcrs filter this if appropriate. */
2671 if (!http->ssl) /* We talk plaintext */
2674 #ifdef FEATURE_KILL_POPUPS
2675 /* Start blocking popups if appropriate. */
2676 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2677 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2679 block_popups_now = 1;
2681 * Filter the part of the body that came in the same read
2682 * as the last headers:
2684 filter_popups(csp->iob->cur, csp);
2686 #endif /* def FEATURE_KILL_POPUPS */
2687 content_filter = get_filter_function(csp);
2690 * Only write if we're not buffering for content modification
2692 if (!content_filter)
2694 /* write the server's (modified) header to
2695 * the client (along with anything else that
2696 * may be in the buffer)
2699 if (write_socket(csp->cfd, hdr, strlen(hdr))
2700 || ((len = flush_socket(csp->cfd, csp)) < 0))
2702 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2704 /* the write failed, so don't bother
2705 * mentioning it to the client...
2706 * it probably can't hear us anyway.
2712 byte_count += (size_t)len;
2715 /* we're finished with the server's header */
2720 /* If this was a MS IIS/5 hack then it means
2721 * the server has already closed the
2722 * connection. Nothing more to read. Time
2733 return; /* huh? we should never get here */
2736 if (csp->content_length == 0)
2739 * If Privoxy didn't recalculate the
2740 * Content-Lenght, byte_count is still
2743 csp->content_length = byte_count;
2746 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2747 csp->ip_addr_str, http->ocmd, csp->content_length);
2751 /*********************************************************************
2755 * Description : This is little more than chat. We only "serve" to
2756 * to close any socket that chat may have opened.
2759 * 1 : csp = Current client state (buffers, headers, etc...)
2763 *********************************************************************/
2765 void serve(struct client_state *csp)
2766 #else /* ifndef AMIGA */
2767 static void serve(struct client_state *csp)
2768 #endif /* def AMIGA */
2771 close_socket(csp->cfd);
2773 if (csp->sfd != JB_INVALID_SOCKET)
2775 close_socket(csp->sfd);
2778 csp->flags &= ~CSP_FLAG_ACTIVE;
2784 /*********************************************************************
2786 * Function : server_thread
2788 * Description : We only exist to call `serve' in a threaded environment.
2791 * 1 : data = Current client state (buffers, headers, etc...)
2793 * Returns : Always 0.
2795 *********************************************************************/
2796 static int32 server_thread(void *data)
2798 serve((struct client_state *) data);
2806 /*********************************************************************
2810 * Description : Print usage info & exit.
2812 * Parameters : Pointer to argv[0] for identifying ourselves
2816 *********************************************************************/
2817 static void usage(const char *myname)
2819 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2823 #endif /* defined(unix) */
2826 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2827 #endif /* defined(unix) */
2828 "[--version] [configfile]\n"
2829 "Aborting\n", myname);
2834 #endif /* defined(unix) */
2837 /*********************************************************************
2839 * Function : initialize_mutexes
2841 * Description : Prepares mutexes if mutex support is available.
2845 * Returns : Void, exits in case of errors.
2847 *********************************************************************/
2848 static void initialize_mutexes(void)
2852 #ifdef FEATURE_PTHREAD
2854 * Prepare global mutex semaphores
2856 err = pthread_mutex_init(&log_mutex, 0);
2858 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2861 * XXX: The assumptions below are a bit naive
2862 * and can cause locks that aren't necessary.
2864 * For example older FreeBSD versions (< 6.x?)
2865 * have no gethostbyname_r, but gethostbyname is
2868 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2869 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2870 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2872 * XXX: should we use a single mutex for
2873 * localtime() and gmtime() as well?
2875 #ifndef HAVE_GMTIME_R
2876 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2877 #endif /* ndef HAVE_GMTIME_R */
2879 #ifndef HAVE_LOCALTIME_R
2880 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2881 #endif /* ndef HAVE_GMTIME_R */
2884 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2885 #endif /* ndef HAVE_RANDOM */
2886 #endif /* FEATURE_PTHREAD */
2889 * TODO: mutex support for mingw32 would be swell.
2894 printf("Fatal error. Mutex initialization failed: %s.\n",
2903 /*********************************************************************
2907 * Description : Load the config file and start the listen loop.
2908 * This function is a lot more *sane* with the `load_config'
2909 * and `listen_loop' functions; although it stills does
2910 * a *little* too much for my taste.
2913 * 1 : argc = Number of parameters (including $0).
2914 * 2 : argv = Array of (char *)'s to the parameters.
2916 * Returns : 1 if : can't open config file, unrecognized directive,
2917 * stats requested in multi-thread mode, can't open the
2918 * log file, can't open the jar file, listen port is invalid,
2919 * any load fails, and can't bind port.
2921 * Else main never returns, the process must be signaled
2922 * to terminate execution. Or, on Windows, use the
2923 * "File", "Exit" menu option.
2925 *********************************************************************/
2927 int real_main(int argc, const char *argv[])
2929 int main(int argc, const char *argv[])
2933 unsigned int random_seed;
2935 struct passwd *pw = NULL;
2936 struct group *grp = NULL;
2939 char *pre_chroot_nslookup_to_load_resolver = NULL;
2946 #if !defined(_WIN32)
2953 init_log_module(Argv[0]);
2956 * Parse the command line arguments
2958 * XXX: simply printing usage information in case of
2959 * invalid arguments isn't particular user friendly.
2961 while (++argc_pos < argc)
2964 /* Check to see if the service must be installed or uninstalled */
2965 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2967 const char *pName = argv[argc_pos] + 9;
2970 exit( (install_service(pName)) ? 0 : 1 );
2972 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
2974 const char *pName = argv[argc_pos] + 11;
2977 exit((uninstall_service(pName)) ? 0 : 1);
2979 else if (strcmp(argv[argc_pos], "--service" ) == 0)
2981 bRunAsService = TRUE;
2982 w32_set_service_cwd();
2983 atexit(w32_service_exit_notify);
2986 #endif /* defined(_WIN32) */
2989 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2991 if (strcmp(argv[argc_pos], "--help") == 0)
2996 else if(strcmp(argv[argc_pos], "--version") == 0)
2998 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3004 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3009 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3011 if (++argc_pos == argc) usage(argv[0]);
3012 pidfile = strdup(argv[argc_pos]);
3015 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3017 if (++argc_pos == argc) usage(argv[argc_pos]);
3019 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3022 if (NULL == (grp = getgrnam(p)))
3024 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3028 if (NULL == (pw = getpwnam(argv[argc_pos])))
3030 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3033 if (p != NULL) *--p = '\0';
3036 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3038 if (++argc_pos == argc) usage(argv[0]);
3039 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3042 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3046 #endif /* defined(unix) */
3048 else if (argc_pos + 1 != argc)
3051 * This is neither the last command line
3052 * option, nor was it recognized before,
3053 * therefore it must be invalid.
3059 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3061 configfile = argv[argc_pos];
3064 } /* -END- while (more arguments) */
3067 if ( *configfile != '/' )
3069 char cwd[BUFFER_SIZE];
3071 size_t abs_file_size;
3073 /* make config-filename absolute here */
3074 if (NULL == getcwd(cwd, sizeof(cwd)))
3076 perror("failed to get current working directory");
3081 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3082 basedir = strdup(cwd);
3084 if (NULL == basedir ||
3085 NULL == (abs_file = malloc(abs_file_size)))
3087 perror("malloc failed");
3090 strlcpy(abs_file, basedir, abs_file_size);
3091 strlcat(abs_file, "/", abs_file_size );
3092 strlcat(abs_file, configfile, abs_file_size);
3093 configfile = abs_file;
3095 #endif /* defined unix */
3099 clients->next = NULL;
3103 #elif defined(_WIN32)
3107 /* Prepare mutexes if supported and necessary. */
3108 initialize_mutexes();
3110 random_seed = (unsigned int)time(NULL);
3112 srandom(random_seed);
3115 #endif /* ifdef HAVE_RANDOM */
3118 * Unix signal handling
3120 * Catch the abort, interrupt and terminate signals for a graceful exit
3121 * Catch the hangup signal so the errlog can be reopened.
3122 * Ignore the broken pipe signals (FIXME: Why?)
3124 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3127 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3128 const int ignored_signals[] = { SIGPIPE, 0 };
3130 for (idx = 0; catched_signals[idx] != 0; idx++)
3132 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3133 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3135 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3136 #endif /* ifdef sun */
3138 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3142 for (idx = 0; ignored_signals[idx] != 0; idx++)
3144 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3146 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3151 #else /* ifdef _WIN32 */
3152 # ifdef _WIN_CONSOLE
3154 * We *are* in a windows console app.
3155 * Print a verbose messages about FAQ's and such
3157 printf("%s", win32_blurb);
3158 # endif /* def _WIN_CONSOLE */
3159 #endif /* def _WIN32 */
3162 /* Initialize the CGI subsystem */
3163 cgi_init_error_messages();
3166 * If runnig on unix and without the --nodaemon
3167 * option, become a daemon. I.e. fork, detach
3168 * from tty and get process group leadership
3181 if ( pid < 0 ) /* error */
3186 else if ( pid != 0 ) /* parent */
3191 * must check for errors
3192 * child died due to missing files aso
3195 wpid = waitpid( pid, &status, WNOHANG );
3204 /* Should be more portable, but not as well tested */
3209 #else /* ndef __FreeBSD__ */
3211 #endif /* ndef __FreeBSD__ */
3212 fd = open("/dev/tty", O_RDONLY);
3215 /* no error check here */
3216 ioctl( fd, TIOCNOTTY,0 );
3221 * stderr (fd 2) will be closed later on, when the
3222 * log file has been parsed.
3229 } /* -END- if (!no_daemon) */
3232 * As soon as we have written the PID file, we can switch
3233 * to the user and group ID indicated by the --user option
3239 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3241 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3247 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3249 /* Read the time zone file from /etc before doing chroot. */
3251 if (NULL != pre_chroot_nslookup_to_load_resolver
3252 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3254 /* Initialize resolver library. */
3255 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3257 if (chroot(pw->pw_dir) < 0)
3259 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3263 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3266 if (setuid(pw->pw_uid))
3268 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3272 char putenv_dummy[64];
3274 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3275 if (putenv(putenv_dummy) != 0)
3277 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3280 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3281 if (putenv(putenv_dummy) != 0)
3283 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3289 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3292 #endif /* defined unix */
3295 /* This will be FALSE unless the command line specified --service
3299 /* Yup, so now we must attempt to establish a connection
3300 * with the service dispatcher. This will only work if this
3301 * process was launched by the service control manager to
3302 * actually run as a service. If this isn't the case, i've
3303 * known it take around 30 seconds or so for the call to return.
3306 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3307 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3309 /* Service has run, and at this point is now being stopped, so just return */
3314 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3316 /* An error occurred. Usually it's because --service was wrongly specified
3317 * and we were unable to connect to the Service Control Dispatcher because
3318 * it wasn't expecting us and is therefore not listening.
3320 * For now, just continue below to call the listen_loop function.
3323 #endif /* def _WIN32 */
3333 /*********************************************************************
3335 * Function : bind_port_helper
3337 * Description : Bind the listen port. Handles logging, and aborts
3341 * 1 : config = Privoxy configuration. Specifies port
3344 * Returns : Port that was opened.
3346 *********************************************************************/
3347 static jb_socket bind_port_helper(struct configuration_spec * config)
3352 if ( (config->haddr != NULL)
3353 && (config->haddr[0] == '1')
3354 && (config->haddr[1] == '2')
3355 && (config->haddr[2] == '7')
3356 && (config->haddr[3] == '.') )
3358 log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
3361 else if (config->haddr == NULL)
3363 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3368 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3369 config->hport, config->haddr);
3372 result = bind_port(config->haddr, config->hport, &bfd);
3379 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3380 "There may be another Privoxy or some other "
3381 "proxy running on port %d",
3382 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3383 config->hport, config->hport);
3386 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3387 "The hostname is not resolvable",
3388 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3391 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3392 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3395 /* shouldn't get here */
3396 return JB_INVALID_SOCKET;
3399 config->need_bind = 0;
3406 /* Without this simple workaround we get this compiler warning from _beginthread
3407 * warning C4028: formal parameter 1 different from declaration
3409 void w32_service_listen_loop(void *p)
3413 #endif /* def _WIN32 */
3416 /*********************************************************************
3418 * Function : listen_loop
3420 * Description : bind the listen port and enter a "FOREVER" listening loop.
3426 *********************************************************************/
3427 static void listen_loop(void)
3429 struct client_state *csp = NULL;
3431 struct configuration_spec * config;
3433 config = load_config();
3435 bfd = bind_port_helper(config);
3437 #ifdef FEATURE_GRACEFUL_TERMINATION
3438 while (!g_terminate)
3443 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3444 while (waitpid(-1, NULL, WNOHANG) > 0)
3446 /* zombie children */
3448 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3451 * Free data that was used by died threads
3457 * Re-open the errlog after HUP signal
3459 if (received_hup_signal)
3461 init_error_log(Argv[0], config->logfile);
3462 received_hup_signal = 0;
3467 #ifdef FEATURE_COOKIE_JAR
3469 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3470 * already open. I think unload_configfile() is not being run, which should do
3471 * this work. Until that can get resolved, we'll use this workaround.
3475 if (csp->config->jar)
3477 fclose(csp->config->jar);
3478 csp->config->jar = NULL;
3480 #endif /* FEATURE_COOKIE_JAR */
3481 #endif /* __OS2__ */
3483 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3485 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3489 csp->flags |= CSP_FLAG_ACTIVE;
3490 csp->sfd = JB_INVALID_SOCKET;
3492 csp->config = config = load_config();
3494 if ( config->need_bind )
3497 * Since we were listening to the "old port", we will not see
3498 * a "listen" param change until the next IJB request. So, at
3499 * least 1 more request must be made for us to find the new
3500 * setting. I am simply closing the old socket and binding the
3503 * Which-ever is correct, we will serve 1 more page via the
3504 * old settings. This should probably be a "show-proxy-args"
3505 * request. This should not be a so common of an operation
3506 * that this will hurt people's feelings.
3511 bfd = bind_port_helper(config);
3514 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3516 if (!accept_connection(csp, bfd))
3518 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3531 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3534 #ifdef FEATURE_TOGGLE
3535 if (global_toggle_state)
3537 csp->flags |= CSP_FLAG_TOGGLED_ON;
3539 #endif /* def FEATURE_TOGGLE */
3541 if (run_loader(csp))
3543 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3544 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3548 if (block_acl(NULL,csp))
3550 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3551 close_socket(csp->cfd);
3555 #endif /* def FEATURE_ACL */
3557 /* add it to the list of clients */
3558 csp->next = clients->next;
3559 clients->next = csp;
3561 if (config->multi_threaded)
3565 /* this is a switch () statment in the C preprocessor - ugh */
3566 #undef SELECTED_ONE_OPTION
3568 /* Use Pthreads in preference to native code */
3569 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3570 #define SELECTED_ONE_OPTION
3572 pthread_t the_thread;
3573 pthread_attr_t attrs;
3575 pthread_attr_init(&attrs);
3576 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3577 errno = pthread_create(&the_thread, &attrs,
3578 (void * (*)(void *))serve, csp);
3579 child_id = errno ? -1 : 0;
3580 pthread_attr_destroy(&attrs);
3584 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3585 #define SELECTED_ONE_OPTION
3586 child_id = _beginthread(
3587 (void (*)(void *))serve,
3592 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3593 #define SELECTED_ONE_OPTION
3594 child_id = _beginthread(
3595 (void(* _Optlink)(void*))serve,
3601 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3602 #define SELECTED_ONE_OPTION
3604 thread_id tid = spawn_thread
3605 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3607 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3609 child_id = (int) tid;
3618 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3619 #define SELECTED_ONE_OPTION
3620 csp->cfd = ReleaseSocket(csp->cfd, -1);
3623 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3624 NP_Output, Output(),
3625 NP_CloseOutput, FALSE,
3626 NP_Name, (ULONG)"privoxy child",
3630 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3631 NP_Output, Output(),
3632 NP_CloseOutput, FALSE,
3633 NP_Name, (ULONG)"privoxy child",
3634 NP_StackSize, 200*1024,
3640 ((struct Task *)child_id)->tc_UserData = csp;
3641 Signal((struct Task *)child_id, SIGF_SINGLE);
3646 #if !defined(SELECTED_ONE_OPTION)
3649 /* This block is only needed when using fork().
3650 * When using threads, the server thread was
3651 * created and run by the call to _beginthread().
3653 if (child_id == 0) /* child */
3656 #ifdef FEATURE_TOGGLE
3657 int inherited_toggle_state = global_toggle_state;
3658 #endif /* def FEATURE_TOGGLE */
3663 * If we've been toggled or we've blocked the request, tell Mom
3666 #ifdef FEATURE_TOGGLE
3667 if (inherited_toggle_state != global_toggle_state)
3669 rc |= RC_FLAG_TOGGLED;
3671 #endif /* def FEATURE_TOGGLE */
3673 #ifdef FEATURE_STATISTICS
3674 if (csp->flags & CSP_FLAG_REJECTED)
3676 rc |= RC_FLAG_BLOCKED;
3678 #endif /* ndef FEATURE_STATISTICS */
3682 else if (child_id > 0) /* parent */
3684 /* in a fork()'d environment, the parent's
3685 * copy of the client socket and the CSP
3689 #if !defined(_WIN32) && !defined(__CYGWIN__)
3691 wait( &child_status );
3694 * Evaluate child's return code: If the child has
3695 * - been toggled, toggle ourselves
3696 * - blocked its request, bump up the stats counter
3699 #ifdef FEATURE_TOGGLE
3700 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3702 global_toggle_state = !global_toggle_state;
3704 #endif /* def FEATURE_TOGGLE */
3706 #ifdef FEATURE_STATISTICS
3708 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3712 #endif /* def FEATURE_STATISTICS */
3714 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3715 close_socket(csp->cfd);
3716 csp->flags &= ~CSP_FLAG_ACTIVE;
3720 #undef SELECTED_ONE_OPTION
3721 /* end of cpp switch () */
3723 if (child_id < 0) /* failed */
3725 char buf[BUFFER_SIZE];
3727 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3729 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3731 write_socket(csp->cfd, buf, strlen(buf));
3732 close_socket(csp->cfd);
3733 csp->flags &= ~CSP_FLAG_ACTIVE;
3744 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3746 /* Clean up. Aim: free all memory (no leaks) */
3747 #ifdef FEATURE_GRACEFUL_TERMINATION
3749 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3751 unload_current_config_file();
3752 unload_current_actions_file();
3753 unload_current_re_filterfile();
3754 #ifdef FEATURE_TRUST
3755 unload_current_trust_file();
3758 if (config->multi_threaded)
3765 } while ((clients->next != NULL) && (--i > 0));
3769 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3780 #ifdef FEATURE_COOKIE_JAR
3781 if (NULL != config->jar)
3783 fclose(config->jar);
3787 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3788 /* Cleanup - remove taskbar icon etc. */
3793 #endif /* FEATURE_GRACEFUL_TERMINATION */