1 const char jcc_rcs[] = "$Id: jcc.c,v 1.160 2007/11/29 18:00:29 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 1.160 2007/11/29 18:00:29 fabiankeil
37 * Plug memory leak. Spotted by Valgrind, triggered by
38 * Privoxy-Regression-Test feeding proxyfuzz.py.
40 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
41 * In the HTTP snipplets, refer to the client as client.
43 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
44 * Emit a log message when activating the MS IIS5 hack.
46 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
47 * Log the "weak randomization factor" warning only
48 * once for mingw32 and provide some more details.
50 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
51 * Initialize log module after initializing mutexes, future
52 * deadlocks in that code should now work cross-platform.
54 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
55 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
56 * Reported by Bert van Leeuwen in BR#1818808.
58 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
59 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
61 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
62 * When in daemon mode, close stderr after the configuration file has been
63 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
65 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
66 * - Fix a crash when parsing invalid requests whose first header
67 * is rejected by get_header(). Regression (re?)introduced
68 * in r1.143 by yours truly.
69 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
70 * client_cookie_adder() to make sure send-vanilla-wafer can be
71 * controlled through tags (and thus regression-tested).
73 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
74 * - Move get_filter_function() from jcc.c to filters.c
75 * so the filter functions can be static.
76 * - Don't bother filtering body-less responses.
78 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
79 * Execute content filters through execute_content_filter().
81 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
82 * Initialize req to NULL to make sure it's defined if the
83 * first read_socket() call fails. Reported by icmp30.
85 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
86 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
87 * extensive comments moved to user manual.
89 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
90 * Don't crash if a broken header filter wiped out the request line.
92 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
93 * Fix byte_count calculation in case of flushes
94 * and don't parse the server headers a second time.
96 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
97 * - If there's a connection problem after we already forwarded
98 * parts of the original content, just hang up. Fixes BR#1776724.
99 * - Fix warnings about unused code on mingw32.
100 * - In case of flushes, calculate the byte count
101 * less incorrectly (I think).
103 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
104 * Add some more prototypes for static functions.
106 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
107 * Comment out request_contains_null_bytes() until it's used again.
109 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
110 * #1763173 from Stefan Huehner: s@const static@static const@
111 * and declare some more functions static.
113 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
114 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
115 * and explain why they were rejected in the first place.
116 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
117 * CONNECT requests. The request line was missing.
118 * - Add two more XXX reminders as we don't have enough already.
120 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
121 * As Hal noticed, checking dispatch_cgi() as the last cruncher
122 * looks like a bug if CGI requests are blocked unintentionally,
123 * so don't do it unless the user enabled the new config option
124 * "allow-cgi-request-crunching".
126 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
127 * - Allow to rewrite the request destination behind the client's back.
128 * - Turn the weird-looking unconditional for loop that
129 * reads the client request into a conditional while loop.
130 * Move the stuff that only runs once out of the loop.
131 * - Move parts of chat(), server_content_type() and the
132 * necessary stuff to fix BR#1750917 into get_filter_function().
134 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
135 * Temporary workaround for BR#1730105.
137 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
138 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
139 * deadlocks and crashes on OpenBSD and possibly other OS with neither
140 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
141 * Thanks to Ralf Horstmann for report and solution.
143 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
144 * Add forward-override{} to change the forwarding settings through
145 * action sections. This is mainly interesting to forward different
146 * clients differently (for example based on User-Agent or request
149 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
150 * - Let usage() mention the --chroot parameter.
151 * - Use read_socket() consistently and always leave
152 * the last buffer byte alone, even in cases where
153 * null termination (currently) doesn't matter.
155 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
156 * - Fix config file loading on Unix if no config file is specified.
157 * Since r1.97 Privoxy would always interpret the last argument as
158 * config file, even if it's a valid command line option.
159 * - Abort in case of unrecognized command line options. Closes #1719696.
160 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
161 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
163 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
164 * - Don't rerun crunchers that only depend on the request URL.
165 * - Don't count redirects and CGI requests as "blocked requests".
167 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
168 * Support crunching based on tags created by server-header taggers.
170 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
171 * Make HTTP snippets static (again). Add a Content-Type for those
172 * with content so the browser doesn't guess it based on the URL.
174 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
175 * Move crunching and request line rebuilding out of chat().
177 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
178 * Introduce tags as alternative way to specify which
179 * actions apply to a request. At the moment tags can be
180 * created based on client and server headers.
182 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
183 * Don't CLF-log CONNECT requests twice.
185 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
186 * Log the source address for ACL-related connection drops.
188 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
189 * New config option: enforce-blocks.
191 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
192 * - Move null byte check into separate function.
193 * - Don't confuse the client with error pages
194 * if a CONNECT request was already confirmed.
196 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
197 * Speed up NULL byte escaping and only log the complete
198 * NULL byte requests with header debugging enabled.
200 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
201 * Answer requests that contain NULL bytes with
202 * a custom response instead of waiting for more
203 * data until the client eventually hangs up.
205 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
206 * - Move delivery and logging of crunched responses
207 * from chat() into send_crunch_response().
208 * - Display the reason for generating http_responses.
209 * - Log the content length for LOG_LEVEL_CLF correctly
210 * (still incorrect for some fixed responses).
211 * - Reword an incorrect comment about
212 * treat-forbidden-connects-like-blocks violating
214 * - Add some log messages.
216 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
217 * Move mutex initialization into separate
218 * function and exit in case of errors.
220 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
221 * - Start to reduce chat()'s line count and move
222 * parts of it into separate functions.
223 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
225 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
226 * - Add Proxy-Agent header to HTTP snippets that are
227 * supposed to reach HTTP clients only.
228 * - Made a few CONNECT log messages more descriptive.
229 * - Catch completely empty server responses (as seen
230 * with Tor's fake ".noconnect" top level domain).
231 * - Use shiny new "forwarding-failed" template for socks errors.
233 * Revision 1.118 2007/01/07 07:43:43 joergs
234 * AmigaOS4 support added.
236 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
237 * Added config option accept-intercepted-requests
238 * and disabled it by default.
240 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
241 * Reverted parts of my last commit
242 * to keep error handling working.
244 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
245 * Fixed gcc43 conversion warnings.
247 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
248 * Fix -pedantic ISO C warning about converting
249 * from function pointer to object pointer.
251 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
252 * Silence compiler warning I introduced with my last commit.
254 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
255 * Mutex protect rand() if POSIX threading
256 * is used, warn the user if that's not possible
257 * and stop using it on _WIN32 where it could
260 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
261 * Don't prevent core dumps by catching SIGABRT.
262 * It's rude and makes debugging unreasonable painful.
264 * Revision 1.110 2006/12/13 14:52:53 etresoft
265 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
267 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
268 * Privoxy is now able to run as intercepting
269 * proxy in combination with any packet filter
270 * that does the port redirection. The destination
271 * is extracted from the "Host:" header which
272 * should be available for nearly all requests.
274 * Moved HTTP snipplets into jcc.c.
275 * Added error message for gopher proxy requests.
277 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
278 * Only unlink the pidfile if it's actually used.
280 * Change order of interception checks to make
281 * it possible to block or redirect requests for
284 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
285 * Make pthread mutex locking more generic. Instead of
286 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
287 * and use mutex locking unless there is an _r function
288 * available. Better safe than sorry.
290 * Fixes "./configure --disable-pthread" and should result
291 * in less threading-related problems on pthread-using platforms,
292 * but it still doesn't fix BR#1122404.
294 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
295 * Move pthread.h inclusion from jcc.c to jcc.h.
296 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
298 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
299 * Don't exit after receiving the second SIGHUP on Solaris.
301 * Fixes BR 1052235, but the same problem may exist on other
302 * systems. Once 3.0.6 is out we should use sigset()
303 * where available and see if it breaks anything.
305 * Revision 1.104 2006/09/23 13:26:38 roro
306 * Replace TABs by spaces in source code.
308 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
309 * Fix +redirect{}. Didn't work with -fast-redirects.
311 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
312 * Respond with 400 and a short text message
313 * if the client tries to use Privoxy as FTP proxy.
315 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
316 * Make number of retries in case of forwarded-connect problems
317 * a config file option (forwarded-connect-retries) and use 0 as
320 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
321 * Set random(3) seed.
323 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
324 * Follow the OpenBSD port's lead and protect the resolve
325 * functions on OpenBSD as well.
327 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
328 * --user fix. Only use the user as group if no group is specified.
329 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
331 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
332 * Windows service (re-)integration
336 * --install[:service_name]
337 * --uninstall[:service_name]
340 * They work as follows:
341 * --install will create a service for you and then terminate.
342 * By default the service name will be "privoxy" (without the quotes).
343 * However you can run multiple services if you wish, just by adding
344 * a colon and then a name (no spaces).
346 * --uninstall follows the exact same rules a --install.
348 * --service is used when the program is executed by the service
349 * control manager, and in normal circumstances would never be
350 * used as a command line argument.
352 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
353 * Windows service integration
355 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
356 * Incorporate Fabian Keil's patch work:
357 http://www.fabiankeil.de/sourcecode/privoxy/
359 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
360 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
361 * with what was really the latest development (the v_3_0_branch branch)
363 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
364 * Thanks to Jindrich Makovicka for a race condition fix for the log
365 * file. The race condition remains for non-pthread implementations.
366 * Reference patch #1175720.
368 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
369 * Add the ability to check jpeg images for invalid
370 * lengths of comment blocks. Defensive strategy
371 * against the exploit:
372 * Microsoft Security Bulletin MS04-028
373 * Buffer Overrun in JPEG Processing (GDI+) Could
374 * Allow Code Execution (833987)
375 * Enabled with +inspect-jpegs in actions files.
377 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
378 * - Fixed usage info for non-unix platforms
379 * - Fixed small cmdline parsing bug
381 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
382 * Diagnostics: Now preserve the returncode of pthread_create
383 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
385 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
386 * No longer ignore SIGCHLD. Fixes bug #769381
388 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
389 * Close jarfile on graceful exit, remove stray line
391 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
392 * Cosmetics: Killed a warning, a typo and an allocation left at exit
394 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
395 * No longer rely on non-POSIX.1 extensions of getcwd().
398 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
399 * Replaced setenv() by posix-compliant putenv()
400 * Thanks to Neil McCalden (nmcc AT users.sf.net).
402 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
403 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
405 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
406 * Clean-up and extension of improvements for forked mode:
407 * - Child's return code now consists of flags RC_FLAG_*
408 * - Reporting toggle to parent now properly #ifdef'ed
409 * - Children now report blocking to parent. This enables
410 * statistics in forked mode
412 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
413 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
414 * Children now report having been toggled through _exit(17), parents
415 * watch for that code and toggle themselves if found.
417 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
418 * Wrapping all *_r functions (the non-_r versions of them) with
419 * mutex semaphores for OSX. Hopefully this will take care of all
420 * of those pesky crash reports.
422 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
423 * Fixed two mostly harmless mem leaks
425 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
426 * Fix: Head of global clients list now initialized to NULL
428 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
429 * Added basic support for OPTIONS and TRACE HTTP methods:
430 * - New interceptor direct_response() added in chat().
431 * - sed() moved to earlier in the process, so that the
432 * Host: header is evaluated before actions and forwarding
435 * Revision 1.92 2002/05/08 16:00:46 oes
436 * Chat's buffer handling:
437 * - Fixed bug with unchecked out-of-mem conditions
438 * while reading client request & server headers
439 * - No longer predict if the buffer limit will be exceeded
440 * in the next read -- check add_to_iob's new
441 * return code. If buffer couldn't be extended
442 * (policy or out-of-mem) while
443 * - reading from client: abort
444 * - reading server headers: send error page
445 * - buffering server body for filter: flush,
446 * and if that fails: send error page
448 * Revision 1.91 2002/04/08 20:35:58 swa
451 * Revision 1.90 2002/04/02 14:57:28 oes
452 * Made sending wafers independent of FEATURE_COOKIE_JAR
454 * Revision 1.89 2002/03/31 17:18:59 jongfoster
455 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
457 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
458 * More compiler warning message maintenance
460 * Revision 1.87 2002/03/26 22:29:54 swa
461 * we have a new homepage!
463 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
464 * Workaround for closing the jarfile before load_config() comes around again
466 * Revision 1.85 2002/03/24 15:23:33 jongfoster
469 * Revision 1.84 2002/03/24 13:25:43 swa
470 * name change related issues
472 * Revision 1.83 2002/03/16 23:54:06 jongfoster
473 * Adding graceful termination feature, to help look for memory leaks.
474 * If you enable this (which, by design, has to be done by hand
475 * editing config.h) and then go to http://i.j.b/die, then the program
476 * will exit cleanly after the *next* request. It should free all the
477 * memory that was used.
479 * Revision 1.82 2002/03/13 00:27:05 jongfoster
482 * Revision 1.81 2002/03/12 01:42:50 oes
483 * Introduced modular filters
485 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
486 * OS/2 port maintenance:
487 * - Fixed EMX build - it had decayed a little
488 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
489 * substituted a memset for now.
491 * Revision 1.79 2002/03/09 20:03:52 jongfoster
492 * - Making various functions return int rather than size_t.
493 * (Undoing a recent change). Since size_t is unsigned on
494 * Windows, functions like read_socket that return -1 on
495 * error cannot return a size_t.
497 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
498 * crashes, and also frequently caused JB to jump to 100%
499 * CPU and stay there. (Because it thought it had just
500 * read ((unsigned)-1) == 4Gb of data...)
502 * - The signature of write_socket has changed, it now simply
503 * returns success=0/failure=nonzero.
505 * - Trying to get rid of a few warnings --with-debug on
506 * Windows, I've introduced a new type "jb_socket". This is
507 * used for the socket file descriptors. On Windows, this
508 * is SOCKET (a typedef for unsigned). Everywhere else, it's
509 * an int. The error value can't be -1 any more, so it's
510 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
511 * Windows it maps to the #define INVALID_SOCKET.)
513 * - The signature of bind_port has changed.
515 * Revision 1.78 2002/03/08 21:35:04 oes
516 * Added optional group supplement to --user option. Will now use default group of user if no group given
518 * Revision 1.77 2002/03/07 03:52:06 oes
519 * - Fixed compiler warnings etc
520 * - Improved handling of failed DNS lookups
522 * Revision 1.76 2002/03/06 22:54:35 jongfoster
523 * Automated function-comment nitpicking.
525 * Revision 1.75 2002/03/06 10:02:19 oes
526 * Fixed stupid bug when --user was not given
528 * Revision 1.74 2002/03/06 00:49:31 jongfoster
529 * Fixing warning on Windows
530 * Making #ifdefs that refer to the same variable consistently
531 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
533 * Revision 1.73 2002/03/05 23:57:30 hal9
534 * Stray character 's' on line 1618 was breaking build.
536 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
537 * - Re-enable OS/2 building after new parms were added
538 * - Fix false out of memory report when resolving CGI templates when no IP
539 * address is available of failed attempt (a la no such domain)
541 * Revision 1.71 2002/03/05 18:13:56 oes
542 * Added --user option
544 * Revision 1.70 2002/03/05 04:52:42 oes
545 * Deleted non-errlog debugging code
547 * Revision 1.69 2002/03/04 23:50:00 jongfoster
548 * Splitting off bind_port() call into bind_port_helper(), with
551 * Revision 1.68 2002/03/04 20:17:32 oes
554 * Revision 1.67 2002/03/04 18:18:57 oes
555 * - Removed _DEBUG mode
556 * - Cleand up cmdline parsing
557 * - Introduced --no-daemon, --pidfile options
558 * - Cleaned up signal handling:
559 * - Terminate cleanly on INT, TERM and ABRT
560 * - Schedule logfile for re-opening on HUP
561 * - Ignore CHLD and PIPE
562 * - Leave the rest with their default handlers
563 * - Uniform handler registration
564 * - Added usage() function
565 * - Played styleguide police
567 * Revision 1.66 2002/03/03 15:06:55 oes
568 * Re-enabled automatic config reloading
570 * Revision 1.65 2002/03/03 14:49:11 oes
571 * Fixed CLF logging: Now uses client's original HTTP request
573 * Revision 1.64 2002/03/03 09:18:03 joergs
574 * Made jumbjuster work on AmigaOS again.
576 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
577 * Clean up a little CRLF unpleasantness that suddenly appeared
579 * Revision 1.62 2002/02/20 23:17:23 jongfoster
580 * Detecting some out-of memory conditions and exiting with a log message.
582 * Revision 1.61 2002/01/17 21:01:52 jongfoster
583 * Moving all our URL and URL pattern parsing code to urlmatch.c.
585 * Revision 1.60 2001/12/30 14:07:32 steudten
586 * - Add signal handling (unix)
587 * - Add SIGHUP handler (unix)
588 * - Add creation of pidfile (unix)
589 * - Add action 'top' in rc file (RH)
590 * - Add entry 'SIGNALS' to manpage
591 * - Add exit message to logfile (unix)
593 * Revision 1.59 2001/12/13 14:07:18 oes
594 * Fixed Bug: 503 error page now sent OK
596 * Revision 1.58 2001/11/30 23:37:24 jongfoster
597 * Renaming the Win32 config file to config.txt - this is almost the
598 * same as the corresponding UNIX name "config"
600 * Revision 1.57 2001/11/16 00:47:43 jongfoster
601 * Changing the tty-disconnection code to use setsid().
603 * Revision 1.56 2001/11/13 20:20:54 jongfoster
604 * Tabs->spaces, fixing a bug with missing {} around an if()
606 * Revision 1.55 2001/11/13 20:14:53 jongfoster
607 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
609 * Revision 1.54 2001/11/07 00:03:14 steudten
610 * Give reliable return value if an error
611 * occurs not just 0 with new daemon mode.
613 * Revision 1.53 2001/11/05 21:41:43 steudten
614 * Add changes to be a real daemon just for unix os.
615 * (change cwd to /, detach from controlling tty, set
616 * process group and session leader to the own process.
618 * Add some fatal-error log message for failed malloc().
619 * Add '-d' if compiled with 'configure --with-debug' to
620 * enable debug output.
622 * Revision 1.52 2001/10/26 20:11:20 jongfoster
623 * Fixing type mismatch
625 * Revision 1.51 2001/10/26 17:38:28 oes
628 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
629 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
630 * threads to call select() simultaneously. So, it's time to do a real, live,
631 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
632 * (native). Both versions will work, but using __OS2__ offers multi-threading.
634 * Revision 1.49 2001/10/23 21:41:35 jongfoster
635 * Added call to initialize the (statically-allocated of course)
636 * "out of memory" CGI response.
638 * Revision 1.48 2001/10/10 19:56:46 jongfoster
639 * Moving some code that wasn't cookie-related out of an #ifdef
642 * Revision 1.47 2001/10/10 16:44:36 oes
643 * Added CONNECT destination port limitation check
645 * Revision 1.46 2001/10/08 15:17:41 oes
646 * Re-enabled SSL forwarding
648 * Revision 1.45 2001/10/07 15:42:11 oes
649 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
651 * Moved downgrading of the HTTP version from parse_http_request to
652 * chat(), since we can't decide if it is necessary before we have
653 * determined the actions for the URL. The HTTP command is now
654 * *always* re-built so the repairs need no longer be special-cased.
656 * filter_popups now gets a csp pointer so it can raise the new
657 * CSP_FLAG_MODIFIED flag.
661 * Added configurable size limit for the IOB. If the IOB grows so
662 * large that the next read would exceed the limit, the header
663 * is generated, and the header & unfiltered buffer are flushed
664 * to the client. Chat then continues in non-buffering,
665 * non-filtering body mode.
667 * Revision 1.44 2001/10/02 18:13:57 oes
670 * Revision 1.43 2001/10/02 15:32:13 oes
671 * Moved generation of hdr
673 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
674 * Cleaning up 2 compiler warnings on OS/2.
676 * Revision 1.41 2001/09/16 17:05:14 jongfoster
677 * Removing unused #include showarg.h
679 * Revision 1.40 2001/09/16 15:41:45 jongfoster
680 * Fixing signed/unsigned comparison warning.
682 * Revision 1.39 2001/09/16 13:21:27 jongfoster
683 * Changes to use new list functions.
685 * Revision 1.38 2001/09/16 13:01:46 jongfoster
686 * Removing redundant function call that zeroed zalloc()'d memory.
688 * Revision 1.37 2001/09/10 11:12:24 oes
689 * Deleted unused variable
691 * Revision 1.36 2001/09/10 10:56:15 oes
692 * Silenced compiler warnings
694 * Revision 1.35 2001/07/31 14:44:22 oes
695 * Deleted unused size parameter from filter_popups()
697 * Revision 1.34 2001/07/30 22:08:36 jongfoster
698 * Tidying up #defines:
699 * - All feature #defines are now of the form FEATURE_xxx
700 * - Permanently turned off WIN_GUI_EDIT
701 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
703 * Revision 1.33 2001/07/29 19:32:00 jongfoster
704 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
706 * Revision 1.32 2001/07/29 18:47:05 jongfoster
707 * Adding missing #include "loadcfg.h"
709 * Revision 1.31 2001/07/29 12:17:48 oes
710 * Applied pthread fix by Paul Lieverse
712 * Revision 1.30 2001/07/25 22:57:13 jongfoster
713 * __BEOS__ no longer overrides FEATURE_PTHREAD.
714 * This is because FEATURE_PTHREAD will soon be widely used, so I
715 * want to keep it simple.
717 * Revision 1.29 2001/07/24 12:47:06 oes
718 * Applied BeOS support update by Eugenia
720 * Revision 1.28 2001/07/23 13:26:12 oes
721 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
723 * Revision 1.27 2001/07/19 19:09:47 haroon
724 * - Added code to take care of the situation where while processing the first
725 * server response (which includes the server header), after finding the end
726 * of the headers we were not looking past the end of the headers for
727 * content modification. I enabled it for filter_popups.
728 * Someone else should look to see if other similar operations should be
729 * done to the discarded portion of the buffer.
731 * Note 2001/07/20: No, the other content modification mechanisms will process
732 * the whole iob later anyway. --oes
734 * Revision 1.26 2001/07/18 12:31:36 oes
737 * Revision 1.25 2001/07/15 19:43:49 jongfoster
738 * Supports POSIX threads.
739 * Also removed some unused #includes.
741 * Revision 1.24 2001/07/13 14:00:40 oes
742 * - Generic content modification scheme:
743 * Each feature has its own applicability flag that is set
744 * from csp->action->flags.
745 * Replaced the "filtering" int flag , by a function pointer
746 * "content_filter" to the function that will do the content
747 * modification. If it is != NULL, the document will be buffered
748 * and processed through *content_filter, which must set
749 * csp->content_length and return a modified copy of the body
750 * or return NULL (on failiure).
751 * - Changed csp->is_text to the more generic bitmap csp->content_type
752 * which can currently take the valued CT_TEXT or CT_GIF
754 * - Removed all #ifdef PCRS
756 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
757 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
758 * the `block_acl' call. This prevents a compilation error when the user
759 * does not wish to use the "ACL" feature.
761 * Revision 1.22 2001/06/29 21:45:41 oes
762 * Indentation, CRLF->LF, Tab-> Space
764 * Revision 1.21 2001/06/29 13:29:36 oes
765 * - Cleaned up, improved comments
766 * - Unified all possible interceptors (CGI,
767 * block, trust, fast_redirect) in one
768 * place, with one (CGI) answer generation
769 * mechansim. Much clearer now.
770 * - Removed the GIF image generation, which
771 * is now done in filters.c:block_url()
772 * - Made error conditions like domain lookup
773 * failiure or (various) problems while talking
774 * to the server use cgi.c:error_response()
775 * instead of generating HTML/HTTP in chat() (yuck!)
776 * - Removed logentry from cancelled commit
778 * Revision 1.20 2001/06/09 10:55:28 jongfoster
779 * Changing BUFSIZ ==> BUFFER_SIZE
781 * Revision 1.19 2001/06/07 23:12:52 jongfoster
782 * Replacing function pointer in struct gateway with a directly
783 * called function forwarded_connect().
784 * Replacing struct gateway with struct forward_spec
786 * Revision 1.18 2001/06/03 19:12:16 oes
787 * introduced new cgi handling
789 * Revision 1.17 2001/06/01 20:07:23 jongfoster
790 * Now uses action +image-blocker{} rather than config->tinygif
792 * Revision 1.16 2001/06/01 18:49:17 jongfoster
793 * Replaced "list_share" with "list" - the tiny memory gain was not
794 * worth the extra complexity.
796 * Revision 1.15 2001/05/31 21:24:47 jongfoster
797 * Changed "permission" to "action" throughout.
798 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
799 * Moved vanilla wafer check into chat(), since we must now
800 * decide whether or not to add it based on the URL.
802 * Revision 1.14 2001/05/29 20:14:01 joergs
803 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
806 * Revision 1.13 2001/05/29 09:50:24 jongfoster
807 * Unified blocklist/imagelist/permissionslist.
808 * File format is still under discussion, but the internal changes
811 * Also modified interceptor behaviour:
812 * - We now intercept all URLs beginning with one of the following
813 * prefixes (and *only* these prefixes):
815 * * http://ijbswa.sf.net/config/
816 * * http://ijbswa.sourceforge.net/config/
817 * - New interceptors "home page" - go to http://i.j.b/ to see it.
818 * - Internal changes so that intercepted and fast redirect pages
819 * are not replaced with an image.
820 * - Interceptors now have the option to send a binary page direct
821 * to the client. (i.e. ijb-send-banner uses this)
822 * - Implemented show-url-info interceptor. (Which is why I needed
823 * the above interceptors changes - a typical URL is
824 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
825 * The previous mechanism would not have intercepted that, and
826 * if it had been intercepted then it then it would have replaced
829 * Revision 1.12 2001/05/27 22:17:04 oes
831 * - re_process_buffer no longer writes the modified buffer
832 * to the client, which was very ugly. It now returns the
833 * buffer, which it is then written by chat.
835 * - content_length now adjusts the Content-Length: header
836 * for modified documents rather than crunch()ing it.
837 * (Length info in csp->content_length, which is 0 for
838 * unmodified documents)
840 * - For this to work, sed() is called twice when filtering.
842 * Revision 1.11 2001/05/26 17:27:53 jongfoster
843 * Added support for CLF and fixed LOG_LEVEL_LOG.
844 * Also did CRLF->LF fix of my previous patch.
846 * Revision 1.10 2001/05/26 15:26:15 jongfoster
847 * ACL feature now provides more security by immediately dropping
848 * connections from untrusted hosts.
850 * Revision 1.9 2001/05/26 00:28:36 jongfoster
851 * Automatic reloading of config file.
852 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
853 * Most of the global variables have been moved to a new
854 * struct configuration_spec, accessed through csp->config->globalname
855 * Most of the globals remaining are used by the Win32 GUI.
857 * Revision 1.8 2001/05/25 22:43:18 jongfoster
858 * Fixing minor memory leak and buffer overflow.
860 * Revision 1.7 2001/05/25 22:34:30 jongfoster
863 * Revision 1.6 2001/05/23 00:13:58 joergs
864 * AmigaOS support fixed.
866 * Revision 1.5 2001/05/22 18:46:04 oes
868 * - Enabled filtering banners by size rather than URL
869 * by adding patterns that replace all standard banner
870 * sizes with the "Junkbuster" gif to the re_filterfile
872 * - Enabled filtering WebBugs by providing a pattern
873 * which kills all 1x1 images
875 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
876 * which is selected by the (nonstandard and therefore
877 * capital) letter 'U' in the option string.
878 * It causes the quantifiers to be ungreedy by default.
879 * Appending a ? turns back to greedy (!).
881 * - Added a new interceptor ijb-send-banner, which
882 * sends back the "Junkbuster" gif. Without imagelist or
883 * MSIE detection support, or if tinygif = 1, or the
884 * URL isn't recognized as an imageurl, a lame HTML
885 * explanation is sent instead.
887 * - Added new feature, which permits blocking remote
888 * script redirects and firing back a local redirect
890 * The feature is conditionally compiled, i.e. it
891 * can be disabled with --disable-fast-redirects,
892 * plus it must be activated by a "fast-redirects"
893 * line in the config file, has its own log level
894 * and of course wants to be displayed by show-proxy-args
895 * Note: Boy, all the #ifdefs in 1001 locations and
896 * all the fumbling with configure.in and acconfig.h
897 * were *way* more work than the feature itself :-(
899 * - Because a generic redirect template was needed for
900 * this, tinygif = 3 now uses the same.
902 * - Moved GIFs, and other static HTTP response templates
907 * - Removed some >400 CRs again (Jon, you really worked
910 * Revision 1.4 2001/05/21 19:34:01 jongfoster
911 * Made failure to bind() a fatal error.
913 * Revision 1.3 2001/05/20 01:21:20 jongfoster
914 * Version 2.9.4 checkin.
915 * - Merged popupfile and cookiefile, and added control over PCRS
916 * filtering, in new "permissionsfile".
917 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
918 * file error you now get a message box (in the Win32 GUI) rather
919 * than the program exiting with no explanation.
920 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
922 * - Removed tabs from "config"
923 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
924 * - Bumped up version number.
926 * Revision 1.2 2001/05/17 22:34:44 oes
927 * - Added hint on GIF char array generation to jcc.c
928 * - Cleaned CRLF's from the sources and related files
929 * - Repaired logging for REF and FRC
931 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
932 * Initial import of version 2.9.3 source tree
935 *********************************************************************/
941 #include <sys/types.h>
950 # ifndef FEATURE_PTHREAD
954 # include <windows.h>
955 # include <process.h>
956 # endif /* ndef FEATURE_PTHREAD */
959 # ifndef _WIN_CONSOLE
961 # endif /* ndef _WIN_CONSOLE */
962 # include "w32svrapi.h"
964 #else /* ifndef _WIN32 */
966 # if !defined (__OS2__)
968 # include <sys/wait.h>
969 # endif /* ndef __OS2__ */
970 # include <sys/time.h>
971 # include <sys/stat.h>
972 # include <sys/ioctl.h>
975 #include <sys/termios.h>
986 # include <socket.h> /* BeOS has select() for sockets only. */
987 # include <OS.h> /* declarations for threads and stuff. */
990 # if defined(__EMX__) || defined(__OS2__)
991 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
996 #define bzero(B,N) memset(B,0x00,n)
1000 # include <select.h>
1005 #include "project.h"
1008 #include "filters.h"
1009 #include "loaders.h"
1010 #include "parsers.h"
1011 #include "killpopup.h"
1012 #include "miscutil.h"
1014 #include "jbsockets.h"
1015 #include "gateway.h"
1016 #include "actions.h"
1018 #include "loadcfg.h"
1019 #include "urlmatch.h"
1021 const char jcc_h_rcs[] = JCC_H_VERSION;
1022 const char project_h_rcs[] = PROJECT_H_VERSION;
1025 struct client_state clients[1];
1026 struct file_list files[1];
1028 #ifdef FEATURE_STATISTICS
1029 int urls_read = 0; /* total nr of urls read inc rejected */
1030 int urls_rejected = 0; /* total nr of urls rejected */
1031 #endif /* def FEATURE_STATISTICS */
1033 #ifdef FEATURE_GRACEFUL_TERMINATION
1034 int g_terminate = 0;
1037 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1038 static void sig_handler(int the_signal);
1040 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1041 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1042 static jb_err get_server_headers(struct client_state *csp);
1043 static const char *crunch_reason(const struct http_response *rsp);
1044 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1046 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1048 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1049 static jb_err change_request_destination(struct client_state *csp);
1050 static void chat(struct client_state *csp);
1051 static void serve(struct client_state *csp);
1053 static void usage(const char *myname);
1055 static void initialize_mutexes(void);
1056 static jb_socket bind_port_helper(struct configuration_spec *config);
1057 static void listen_loop(void);
1060 void serve(struct client_state *csp);
1061 #else /* ifndef AMIGA */
1062 static void serve(struct client_state *csp);
1063 #endif /* def AMIGA */
1066 static int32 server_thread(void *data);
1067 #endif /* def __BEOS__ */
1070 #define sleep(N) Sleep(((N) * 1000))
1074 #define sleep(N) DosSleep(((N) * 100))
1077 #ifdef FEATURE_PTHREAD
1078 pthread_mutex_t log_mutex;
1079 pthread_mutex_t log_init_mutex;
1081 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1082 pthread_mutex_t resolver_mutex;
1083 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1085 #ifndef HAVE_GMTIME_R
1086 pthread_mutex_t gmtime_mutex;
1087 #endif /* ndef HAVE_GMTIME_R */
1089 #ifndef HAVE_LOCALTIME_R
1090 pthread_mutex_t localtime_mutex;
1091 #endif /* ndef HAVE_GMTIME_R */
1094 pthread_mutex_t rand_mutex;
1095 #endif /* ndef HAVE_RANDOM */
1097 #endif /* FEATURE_PTHREAD */
1099 #if defined(unix) || defined(__EMX__)
1100 const char *basedir = NULL;
1101 const char *pidfile = NULL;
1102 int received_hup_signal = 0;
1103 #endif /* defined unix */
1105 /* HTTP snipplets. */
1106 static const char CSUCCEED[] =
1107 "HTTP/1.0 200 Connection established\r\n"
1108 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1110 static const char CHEADER[] =
1111 "HTTP/1.0 400 Invalid header received from client\r\n"
1112 "Proxy-Agent: Privoxy " VERSION "\r\n"
1113 "Content-Type: text/plain\r\n"
1114 "Connection: close\r\n\r\n"
1115 "Invalid header received from client.\r\n";
1117 static const char CFORBIDDEN[] =
1118 "HTTP/1.0 403 Connection not allowable\r\n"
1119 "Proxy-Agent: Privoxy " VERSION "\r\n"
1120 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1121 "Connection: close\r\n\r\n";
1123 static const char FTP_RESPONSE[] =
1124 "HTTP/1.0 400 Invalid request received from client\r\n"
1125 "Content-Type: text/plain\r\n"
1126 "Connection: close\r\n\r\n"
1127 "Invalid request. Privoxy doesn't support FTP.\r\n";
1129 static const char GOPHER_RESPONSE[] =
1130 "HTTP/1.0 400 Invalid request received from client\r\n"
1131 "Content-Type: text/plain\r\n"
1132 "Connection: close\r\n\r\n"
1133 "Invalid request. Privoxy doesn't support gopher.\r\n";
1135 /* XXX: should be a template */
1136 static const char MISSING_DESTINATION_RESPONSE[] =
1137 "HTTP/1.0 400 Bad request received from client\r\n"
1138 "Proxy-Agent: Privoxy " VERSION "\r\n"
1139 "Content-Type: text/plain\r\n"
1140 "Connection: close\r\n\r\n"
1141 "Bad request. Privoxy was unable to extract the destination.\r\n";
1143 /* XXX: should be a template */
1144 static const char NO_SERVER_DATA_RESPONSE[] =
1145 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1146 "Proxy-Agent: Privoxy " VERSION "\r\n"
1147 "Content-Type: text/plain\r\n"
1148 "Connection: close\r\n\r\n"
1149 "Empty server or forwarder response.\r\n"
1150 "The connection was closed without sending any data.\r\n";
1153 /* XXX: should be a template */
1154 static const char NULL_BYTE_RESPONSE[] =
1155 "HTTP/1.0 400 Bad request received from client\r\n"
1156 "Proxy-Agent: Privoxy " VERSION "\r\n"
1157 "Content-Type: text/plain\r\n"
1158 "Connection: close\r\n\r\n"
1159 "Bad request. Null byte(s) before end of request.\r\n";
1162 /* XXX: should be a template */
1163 static const char MESSED_UP_REQUEST_RESPONSE[] =
1164 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1165 "Proxy-Agent: Privoxy " VERSION "\r\n"
1166 "Content-Type: text/plain\r\n"
1167 "Connection: close\r\n\r\n"
1168 "Bad request. Messed up with header filters.\r\n";
1170 /* A function to crunch a response */
1171 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1173 /* Crunch function flags */
1174 #define CF_NO_FLAGS 0
1175 /* Cruncher applies to forced requests as well */
1176 #define CF_IGNORE_FORCE 1
1177 /* Crunched requests are counted for the block statistics */
1178 #define CF_COUNT_AS_REJECT 2
1180 /* A crunch function and its flags */
1183 const crunch_func_ptr cruncher;
1187 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1189 /* Complete list of cruncher functions */
1190 static const struct cruncher crunchers_all[] = {
1191 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1192 { block_url, CF_COUNT_AS_REJECT },
1193 #ifdef FEATURE_TRUST
1194 { trust_url, CF_COUNT_AS_REJECT },
1195 #endif /* def FEATURE_TRUST */
1196 { redirect_url, CF_NO_FLAGS },
1197 { dispatch_cgi, CF_IGNORE_FORCE},
1201 /* Light version, used after tags are applied */
1202 static const struct cruncher crunchers_light[] = {
1203 { block_url, CF_COUNT_AS_REJECT },
1204 { redirect_url, CF_NO_FLAGS },
1209 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1210 /*********************************************************************
1212 * Function : sig_handler
1214 * Description : Signal handler for different signals.
1215 * Exit gracefully on TERM and INT
1216 * or set a flag that will cause the errlog
1217 * to be reopened by the main thread on HUP.
1220 * 1 : the_signal = the signal cause this function to call
1224 *********************************************************************/
1225 static void sig_handler(int the_signal)
1231 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1242 received_hup_signal = 1;
1247 * We shouldn't be here, unless we catch signals
1248 * in main() that we can't handle here!
1250 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1258 /*********************************************************************
1260 * Function : client_protocol_is_unsupported
1262 * Description : Checks if the client used a known unsupported
1263 * protocol and deals with it by sending an error
1267 * 1 : csp = Current client state (buffers, headers, etc...)
1268 * 2 : req = the first request line send by the client
1270 * Returns : TRUE if an error response has been generated, or
1271 * FALSE if the request doesn't look invalid.
1273 *********************************************************************/
1274 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1276 char buf[BUFFER_SIZE];
1279 * If it's a FTP or gopher request, we don't support it.
1281 * These checks are better than nothing, but they might
1282 * not work in all configurations and some clients might
1283 * have problems digesting the answer.
1285 * They should, however, never cause more problems than
1286 * Privoxy's old behaviour (returning the misleading HTML
1289 * "Could not resolve http://(ftp|gopher)://example.org").
1291 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1293 if (!strncmpic(req, "GET ftp://", 10))
1295 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1296 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1297 csp->ip_addr_str, req);
1301 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1302 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1303 csp->ip_addr_str, req);
1305 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1307 write_socket(csp->cfd, buf, strlen(buf));
1316 /*********************************************************************
1318 * Function : get_request_destination_elsewhere
1320 * Description : If the client's request was redirected into
1321 * Privoxy without the client's knowledge,
1322 * the request line lacks the destination host.
1324 * This function tries to get it elsewhere,
1325 * provided accept-intercepted-requests is enabled.
1327 * "Elsewhere" currently only means "Host: header",
1328 * but in the future we may ask the redirecting
1329 * packet filter to look the destination up.
1331 * If the destination stays unknown, an error
1332 * response is send to the client and headers
1333 * are freed so that chat() can return directly.
1336 * 1 : csp = Current client state (buffers, headers, etc...)
1337 * 2 : headers = a header list
1339 * Returns : JB_ERR_OK if the destination is now known, or
1340 * JB_ERR_PARSE if it isn't.
1342 *********************************************************************/
1343 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1347 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1349 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1350 " Privoxy isn't configured to accept intercepted requests.",
1351 csp->ip_addr_str, csp->http->cmd);
1352 /* XXX: Use correct size */
1353 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1354 csp->ip_addr_str, csp->http->cmd);
1356 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1357 destroy_list(headers);
1359 return JB_ERR_PARSE;
1361 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1363 /* Split the domain we just got for pattern matching */
1364 init_domain_components(csp->http);
1370 /* We can't work without destination. Go spread the news.*/
1372 req = list_to_text(headers);
1374 /* XXX: Use correct size */
1375 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1376 csp->ip_addr_str, csp->http->cmd);
1377 log_error(LOG_LEVEL_ERROR,
1378 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1379 csp->ip_addr_str, csp->http->cmd, req);
1382 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1383 destroy_list(headers);
1385 return JB_ERR_PARSE;
1388 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1389 * to get the destination IP address, use it as host directly
1390 * or do a reverse DNS lookup first.
1395 /*********************************************************************
1397 * Function : get_server_headers
1399 * Description : Parses server headers in iob and fills them
1400 * into csp->headers so that they can later be
1404 * 1 : csp = Current client state (buffers, headers, etc...)
1406 * Returns : JB_ERR_OK if everything went fine, or
1407 * JB_ERR_PARSE if the headers were incomplete.
1409 *********************************************************************/
1410 static jb_err get_server_headers(struct client_state *csp)
1412 int continue_hack_in_da_house = 0;
1415 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1420 * continue hack in da house. Ignore the ending of
1421 * this head and continue enlisting header lines.
1422 * The reason is described below.
1424 enlist(csp->headers, "");
1425 continue_hack_in_da_house = 0;
1428 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1431 * It's a bodyless continue response, don't
1432 * stop header parsing after reaching it's end.
1434 * As a result Privoxy will concatenate the
1435 * next response's head and parse and deliver
1436 * the headers as if they belonged to one request.
1438 * The client will separate them because of the
1439 * empty line between them.
1441 * XXX: What we're doing here is clearly against
1442 * the intended purpose of the continue header,
1443 * and under some conditions (HTTP/1.0 client request)
1444 * it's a standard violation.
1446 * Anyway, "sort of against the spec" is preferable
1447 * to "always getting confused by Continue responses"
1448 * (Privoxy's behaviour before this hack was added)
1450 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1451 continue_hack_in_da_house = 1;
1453 else if (*header == '\0')
1456 * If the header is empty, but the Continue hack
1457 * isn't active, we can assume that we reached the
1458 * end of the buffer before we hit the end of the
1461 * Inform the caller an let it decide how to handle it.
1463 return JB_ERR_PARSE;
1467 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1470 * XXX: Should we quit the request and return a
1471 * out of memory error page instead?
1473 log_error(LOG_LEVEL_ERROR,
1474 "Out of memory while enlisting server headers. %s lost.",
1484 /*********************************************************************
1486 * Function : crunch_reason
1488 * Description : Translates the crunch reason code into a string.
1491 * 1 : rsp = a http_response
1493 * Returns : A string with the crunch reason or an error description.
1495 *********************************************************************/
1496 static const char *crunch_reason(const struct http_response *rsp)
1498 char * reason = NULL;
1500 assert(rsp != NULL);
1503 return "Internal error while searching for crunch reason";
1506 switch (rsp->reason)
1508 case RSP_REASON_UNSUPPORTED:
1509 reason = "Unsupported HTTP feature";
1511 case RSP_REASON_BLOCKED:
1514 case RSP_REASON_UNTRUSTED:
1515 reason = "Untrusted";
1517 case RSP_REASON_REDIRECTED:
1518 reason = "Redirected";
1520 case RSP_REASON_CGI_CALL:
1521 reason = "CGI Call";
1523 case RSP_REASON_NO_SUCH_DOMAIN:
1524 reason = "DNS failure";
1526 case RSP_REASON_FORWARDING_FAILED:
1527 reason = "Forwarding failed";
1529 case RSP_REASON_CONNECT_FAILED:
1530 reason = "Connection failure";
1532 case RSP_REASON_OUT_OF_MEMORY:
1533 reason = "Out of memory (may mask other reasons)";
1536 reason = "No reason recorded";
1544 /*********************************************************************
1546 * Function : send_crunch_response
1548 * Description : Delivers already prepared response for
1549 * intercepted requests, logs the interception
1550 * and frees the response.
1553 * 1 : csp = Current client state (buffers, headers, etc...)
1554 * 1 : rsp = Fully prepared response. Will be freed on exit.
1556 * Returns : Nothing.
1558 *********************************************************************/
1559 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1561 const struct http_request *http = csp->http;
1562 char status_code[4];
1564 assert(rsp != NULL);
1565 assert(rsp->head != NULL);
1570 * Not supposed to happen. If it does
1571 * anyway, treat it as an unknown error.
1573 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1574 /* return code doesn't matter */
1579 /* If rsp is still NULL, we have serious internal problems. */
1580 log_error(LOG_LEVEL_FATAL,
1581 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1585 * Extract the status code from the actual head
1586 * that was send to the client. It is the only
1587 * way to get it right for all requests, including
1588 * the fixed ones for out-of-memory problems.
1590 * A head starts like this: 'HTTP/1.1 200...'
1594 status_code[0] = rsp->head[9];
1595 status_code[1] = rsp->head[10];
1596 status_code[2] = rsp->head[11];
1597 status_code[3] = '\0';
1599 /* Write the answer to the client */
1600 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1601 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1603 /* There is nothing we can do about it. */
1604 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1607 /* Log that the request was crunched and why. */
1608 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1609 http->hostport, http->path, crunch_reason(rsp));
1610 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1611 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1613 /* Clean up and return */
1614 if (cgi_error_memory() != rsp)
1616 free_http_response(rsp);
1623 /*********************************************************************
1625 * Function : request_contains_null_bytes
1627 * Description : Checks for NULL bytes in the request and sends
1628 * an error message to the client if any were found.
1630 * XXX: currently not used, see comment in chat().
1633 * 1 : csp = Current client state (buffers, headers, etc...)
1634 * 2 : buf = Data from the client's request to check.
1635 * 3 : len = The data length.
1637 * Returns : TRUE if the request contained one or more NULL bytes, or
1640 *********************************************************************/
1641 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1643 size_t c_len; /* Request lenght when treated as C string */
1645 c_len = strlen(buf);
1650 * Null byte(s) found. Log the request,
1651 * return an error response and hang up.
1653 size_t tmp_len = c_len;
1658 * Replace NULL byte(s) with '°' characters
1659 * so the request can be logged as string.
1660 * XXX: Is there a better replacement character?
1663 tmp_len += strlen(buf+tmp_len);
1664 } while (tmp_len < len);
1666 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1667 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1668 log_error(LOG_LEVEL_HEADER,
1669 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1671 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1673 /* XXX: Log correct size */
1674 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1684 /*********************************************************************
1686 * Function : crunch_response_triggered
1688 * Description : Checks if the request has to be crunched,
1689 * and delivers the crunch response if necessary.
1692 * 1 : csp = Current client state (buffers, headers, etc...)
1693 * 2 : crunchers = list of cruncher functions to run
1695 * Returns : TRUE if the request was answered with a crunch response
1698 *********************************************************************/
1699 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1701 struct http_response *rsp = NULL;
1702 const struct cruncher *c;
1705 * If CGI request crunching is disabled,
1706 * check the CGI dispatcher out of order to
1707 * prevent unintentional blocks or redirects.
1709 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1710 && (NULL != (rsp = dispatch_cgi(csp))))
1712 /* Deliver, log and free the interception response. */
1713 send_crunch_response(csp, rsp);
1717 for (c = crunchers; c->cruncher != NULL; c++)
1720 * Check the cruncher if either Privoxy is toggled
1721 * on and the request isn't forced, or if the cruncher
1722 * applies to forced requests as well.
1724 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1725 !(csp->flags & CSP_FLAG_FORCED)) ||
1726 (c->flags & CF_IGNORE_FORCE))
1728 rsp = c->cruncher(csp);
1731 /* Deliver, log and free the interception response. */
1732 send_crunch_response(csp, rsp);
1733 #ifdef FEATURE_STATISTICS
1734 if (c->flags & CF_COUNT_AS_REJECT)
1736 csp->flags |= CSP_FLAG_REJECTED;
1738 #endif /* def FEATURE_STATISTICS */
1749 /*********************************************************************
1751 * Function : build_request_line
1753 * Description : Builds the HTTP request line.
1755 * If a HTTP forwarder is used it expects the whole URL,
1756 * web servers only get the path.
1759 * 1 : csp = Current client state (buffers, headers, etc...)
1760 * 2 : fwd = The forwarding spec used for the request
1761 * XXX: Should use http->fwd instead.
1762 * 3 : request_line = The old request line which will be replaced.
1764 * Returns : Nothing. Terminates in case of memory problems.
1766 *********************************************************************/
1767 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1769 struct http_request *http = csp->http;
1771 assert(http->ssl == 0);
1774 * Downgrade http version from 1.1 to 1.0
1775 * if +downgrade action applies.
1777 if ( (csp->action->flags & ACTION_DOWNGRADE)
1778 && (!strcmpic(http->ver, "HTTP/1.1")))
1781 http->ver = strdup("HTTP/1.0");
1783 if (http->ver == NULL)
1785 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1790 * Rebuild the request line.
1792 freez(*request_line);
1793 *request_line = strdup(http->gpc);
1794 string_append(request_line, " ");
1796 if (fwd->forward_host)
1798 string_append(request_line, http->url);
1802 string_append(request_line, http->path);
1804 string_append(request_line, " ");
1805 string_append(request_line, http->ver);
1807 if (*request_line == NULL)
1809 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1811 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1815 /*********************************************************************
1817 * Function : change_request_destination
1819 * Description : Parse a (rewritten) request line and regenerate
1820 * the http request data.
1823 * 1 : csp = Current client state (buffers, headers, etc...)
1825 * Returns : Forwards the parse_http_request() return code.
1826 * Terminates in case of memory problems.
1828 *********************************************************************/
1829 static jb_err change_request_destination(struct client_state *csp)
1831 struct http_request *http = csp->http;
1834 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1835 free_http_request(http);
1836 err = parse_http_request(csp->headers->first->str, http, csp);
1837 if (JB_ERR_OK != err)
1839 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1840 jb_err_to_string(err));
1842 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1843 if (http->ocmd == NULL)
1845 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1852 /*********************************************************************
1856 * Description : Once a connection to the client has been accepted,
1857 * this function is called (via serve()) to handle the
1858 * main business of the communication. When this
1859 * function returns, the caller must close the client
1862 * FIXME: chat is nearly thousand lines long.
1866 * 1 : csp = Current client state (buffers, headers, etc...)
1868 * Returns : Nothing.
1870 *********************************************************************/
1871 static void chat(struct client_state *csp)
1873 char buf[BUFFER_SIZE];
1881 int ms_iis5_hack = 0;
1882 size_t byte_count = 0;
1883 int forwarded_connect_retries = 0;
1884 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1885 const struct forward_spec * fwd;
1886 struct http_request *http;
1887 int len; /* for buffer sizes (and negative error codes) */
1889 #ifdef FEATURE_KILL_POPUPS
1890 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1891 #endif /* def FEATURE_KILL_POPUPS */
1893 /* Function that does the content filtering for the current request */
1894 filter_function_ptr content_filter = NULL;
1896 /* Skeleton for HTTP response, if we should intercept the request */
1897 struct http_response *rsp;
1899 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1900 struct list header_list;
1901 struct list *headers = &header_list;
1905 memset(buf, 0, sizeof(buf));
1908 * Read the client's request. Note that since we're not using select() we
1909 * could get blocked here if a client connected, then didn't say anything!
1914 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1916 if (len <= 0) break; /* error! */
1919 * If there is no memory left for buffering the
1920 * request, there is nothing we can do but hang up
1922 if (add_to_iob(csp, buf, len))
1927 req = get_header(csp);
1929 } while ((NULL != req) && ('\0' == *req));
1931 if ((NULL != req) && ('\0' != *req))
1933 /* Request received. Validate and parse it. */
1937 * XXX: Temporary disabled to prevent problems
1938 * with POST requests whose bodies are allowed to
1939 * contain NULL bytes. BR#1730105.
1941 * The main purpose of this check is to properly
1942 * log stuff like BitTorrent traffic and other junk
1943 * that hits public proxies. It's not required for
1944 * Privoxy to functions as those requests are discarded
1947 * It probably should be rewritten to only check
1948 * the head of the request. Another option would
1949 * be to let all POST requests pass, although that
1950 * may not be good enough.
1952 if (request_contains_null_bytes(csp, buf, len))
1954 /* NULL bytes found and dealt with, just hang up. */
1959 /* Does the request line look invalid? */
1960 if (client_protocol_is_unsupported(csp, req))
1963 * Yes. The request has already been
1964 * answered with a error response, the buffers
1965 * were freed and we're done with chatting.
1970 #ifdef FEATURE_FORCE_LOAD
1972 * If this request contains the FORCE_PREFIX and blocks
1973 * aren't enforced, get rid of it and set the force flag.
1975 if (strstr(req, FORCE_PREFIX))
1977 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1979 log_error(LOG_LEVEL_FORCE,
1980 "Ignored force prefix in request: \"%s\".", req);
1984 strclean(req, FORCE_PREFIX);
1985 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
1986 csp->flags |= CSP_FLAG_FORCED;
1990 #endif /* def FEATURE_FORCE_LOAD */
1991 err = parse_http_request(req, http, csp);
1992 if (JB_ERR_OK != err)
1994 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2000 if (http->cmd == NULL)
2002 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2003 /* XXX: Use correct size */
2004 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2005 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2007 free_http_request(http);
2011 /* grab the rest of the client's headers */
2015 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2017 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2020 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2021 destroy_list(headers);
2026 * If there is no memory left for buffering the
2027 * request, there is nothing we can do but hang up
2029 if (add_to_iob(csp, buf, len))
2031 destroy_list(headers);
2037 if (p == NULL) break;
2044 if (http->host == NULL)
2047 * If we still don't know the request destination,
2048 * the request is invalid or the client uses
2049 * Privoxy without its knowledge.
2051 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2054 * Our attempts to get the request destination
2055 * elsewhere failed or Privoxy is configured
2056 * to only accept proxy requests.
2058 * An error response has already been send
2059 * and we're done here.
2066 * Determine the actions for this URL
2068 #ifdef FEATURE_TOGGLE
2069 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2071 /* Most compatible set of actions (i.e. none) */
2072 init_current_action(csp->action);
2075 #endif /* ndef FEATURE_TOGGLE */
2077 url_actions(http, csp);
2081 * Save a copy of the original request for logging
2083 http->ocmd = strdup(http->cmd);
2085 if (http->ocmd == NULL)
2087 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2090 enlist(csp->headers, http->cmd);
2092 /* Append the previously read headers */
2093 list_append_list_unique(csp->headers, headers);
2094 destroy_list(headers);
2096 err = sed(client_patterns, add_client_headers, csp);
2097 if (JB_ERR_OK != err)
2099 assert(err == JB_ERR_PARSE);
2100 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2102 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2104 /* Check request line for rewrites. */
2105 if ((NULL == csp->headers->first->str)
2106 || (strcmp(http->cmd, csp->headers->first->str) &&
2107 (JB_ERR_OK != change_request_destination(csp))))
2110 * A header filter broke the request line - bail out.
2112 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2113 /* XXX: Use correct size */
2114 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2115 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2117 free_http_request(http);
2121 /* decide how to route the HTTP request */
2122 if (NULL == (fwd = forward_url(http, csp)))
2124 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2125 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2129 * build the http request to send to the server
2130 * we have to do one of the following:
2132 * create = use the original HTTP request to create a new
2133 * HTTP request that has either the path component
2134 * without the http://domainspec (w/path) or the
2135 * full orininal URL (w/url)
2136 * Note that the path and/or the HTTP version may
2137 * have been altered by now.
2139 * connect = Open a socket to the host:port of the server
2140 * and short-circuit server and client socket.
2142 * pass = Pass the request unchanged if forwarding a CONNECT
2143 * request to a parent proxy. Note that we'll be sending
2144 * the CFAIL message ourselves if connecting to the parent
2145 * fails, but we won't send a CSUCCEED message if it works,
2146 * since that would result in a double message (ours and the
2147 * parent's). After sending the request to the parent, we simply
2150 * here's the matrix:
2153 * +--------+--------+
2155 * 0 | create | connect|
2157 * Forwarding +--------+--------+
2159 * 1 | create | pass |
2161 * +--------+--------+
2166 * Check if a CONNECT request is allowable:
2167 * In the absence of a +limit-connect action, allow only port 443.
2168 * If there is an action, allow whatever matches the specificaton.
2172 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
2173 || (csp->action->flags & ACTION_LIMIT_CONNECT
2174 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
2176 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2179 * The response may confuse some clients,
2180 * but makes unblocking easier.
2182 * XXX: It seems to work with all major browsers,
2183 * so we should consider returning a body by default someday ...
2185 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2186 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2187 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2189 csp->action->flags |= ACTION_BLOCK;
2194 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2195 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2196 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2197 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2199 assert(NULL != csp->http->ocmd);
2200 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2202 list_remove_all(csp->headers);
2204 * XXX: For consistency we might want to log a crunch message here.
2213 freez(csp->headers->first->str);
2214 build_request_line(csp, fwd, &csp->headers->first->str);
2217 hdr = list_to_text(csp->headers);
2220 /* FIXME Should handle error properly */
2221 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2225 * We have a request. Check if one of the crunchers wants it.
2227 if (crunch_response_triggered(csp, crunchers_all))
2230 * Yes. The client got the crunch response
2231 * and we are done here after cleaning up.
2234 list_remove_all(csp->headers);
2240 * The headers can't be removed earlier because
2241 * they were still needed for the referrer check
2242 * in case of CGI crunches.
2244 * XXX: Would it be worth to move the referrer check
2245 * into client_referrer() and set a flag if it's trusted?
2247 list_remove_all(csp->headers);
2249 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2251 if (fwd->forward_host)
2253 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2254 fwd->forward_host, fwd->forward_port, http->hostport);
2258 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2261 /* here we connect to the server, gateway, or the forwarder */
2263 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2264 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2266 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2267 forwarded_connect_retries, http->hostport);
2270 if (csp->sfd == JB_INVALID_SOCKET)
2272 if (fwd->type != SOCKS_NONE)
2275 rsp = error_response(csp, "forwarding-failed", errno);
2277 else if (errno == EINVAL)
2279 rsp = error_response(csp, "no-such-domain", errno);
2283 rsp = error_response(csp, "connect-failed", errno);
2284 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2289 /* Write the answer to the client */
2292 send_crunch_response(csp, rsp);
2299 if (fwd->forward_host || (http->ssl == 0))
2301 /* write the client's (modified) header to the server
2302 * (along with anything else that may be in the buffer)
2305 if (write_socket(csp->sfd, hdr, strlen(hdr))
2306 || (flush_socket(csp->sfd, csp) < 0))
2308 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2311 rsp = error_response(csp, "connect-failed", errno);
2315 send_crunch_response(csp, rsp);
2325 * We're running an SSL tunnel and we're not forwarding,
2326 * so just send the "connect succeeded" message to the
2327 * client, flush the rest, and get out of the way.
2329 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2337 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2339 /* we're finished with the client's header */
2342 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2344 /* pass data between the client and server
2345 * until one or the other shuts down the connection.
2354 * FD_ZERO here seems to point to an errant macro which crashes.
2355 * So do this by hand for now...
2357 memset(&rfds,0x00,sizeof(fd_set));
2361 FD_SET(csp->cfd, &rfds);
2362 FD_SET(csp->sfd, &rfds);
2364 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2368 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2372 /* this is the body of the browser's request
2373 * just read it and write it.
2376 if (FD_ISSET(csp->cfd, &rfds))
2378 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2382 break; /* "game over, man" */
2385 if (write_socket(csp->sfd, buf, (size_t)len))
2387 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2394 * The server wants to talk. It could be the header or the body.
2395 * If `hdr' is null, then it's the header otherwise it's the body.
2396 * FIXME: Does `hdr' really mean `host'? No.
2400 if (FD_ISSET(csp->sfd, &rfds))
2403 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2407 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2409 if (http->ssl && (fwd->forward_host == NULL))
2412 * Just hang up. We already confirmed the client's CONNECT
2413 * request with status code 200 and unencrypted content is
2414 * no longer welcome.
2416 log_error(LOG_LEVEL_ERROR,
2417 "CONNECT already confirmed. Unable to tell the client about the problem.");
2420 else if (byte_count)
2423 * Just hang up. We already transmitted the original headers
2424 * and parts of the original content and therefore missed the
2425 * chance to send an error message (without risking data corruption).
2427 * XXX: we could retry with a fancy range request here.
2429 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2430 "Unable to tell the client about the problem.");
2434 rsp = error_response(csp, "connect-failed", errno);
2438 send_crunch_response(csp, rsp);
2444 /* Add a trailing zero. This lets filter_popups
2445 * use string operations.
2449 #ifdef FEATURE_KILL_POPUPS
2450 /* Filter the popups on this read. */
2451 if (block_popups_now)
2453 filter_popups(buf, csp);
2455 #endif /* def FEATURE_KILL_POPUPS */
2457 /* Normally, this would indicate that we've read
2458 * as much as the server has sent us and we can
2459 * close the client connection. However, Microsoft
2460 * in its wisdom has released IIS/5 with a bug that
2461 * prevents it from sending the trailing \r\n in
2462 * a 302 redirect header (and possibly other headers).
2463 * To work around this if we've haven't parsed
2464 * a full header we'll append a trailing \r\n
2465 * and see if this now generates a valid one.
2467 * This hack shouldn't have any impacts. If we've
2468 * already transmitted the header or if this is a
2469 * SSL connection, then we won't bother with this
2470 * hack. So we only work on partially received
2471 * headers. If we append a \r\n and this still
2472 * doesn't generate a valid header, then we won't
2473 * transmit anything to the client.
2478 if (server_body || http->ssl)
2481 * If we have been buffering up the document,
2482 * now is the time to apply content modification
2483 * and send the result to the client.
2487 p = execute_content_filter(csp, content_filter);
2489 * If the content filter fails, use the original
2490 * buffer and length.
2491 * (see p != NULL ? p : csp->iob->cur below)
2495 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2498 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2500 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2503 hdr = list_to_text(csp->headers);
2506 /* FIXME Should handle error properly */
2507 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2511 * Shouldn't happen because this was the second sed run
2512 * and tags are only created for the first one.
2514 assert(!crunch_response_triggered(csp, crunchers_all));
2516 if (write_socket(csp->cfd, hdr, strlen(hdr))
2517 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2519 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2529 break; /* "game over, man" */
2533 * This is NOT the body, so
2534 * Let's pretend the server just sent us a blank line.
2536 log_error(LOG_LEVEL_INFO,
2537 "Malformerd HTTP headers detected and MS IIS5 hack enabled. "
2538 "Expect an invalid response or even no response at all.");
2539 snprintf(buf, sizeof(buf), "\r\n");
2540 len = (int)strlen(buf);
2543 * Now, let the normal header parsing algorithm below do its
2544 * job. If it fails, we'll exit instead of continuing.
2551 * If this is an SSL connection or we're in the body
2552 * of the server document, just write it to the client,
2553 * unless we need to buffer the body for later content-filtering
2556 if (server_body || http->ssl)
2561 * If there is no memory left for buffering the content, or the buffer limit
2562 * has been reached, switch to non-filtering mode, i.e. make & write the
2563 * header, flush the iob and buf, and get out of the way.
2565 if (add_to_iob(csp, buf, len))
2570 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2572 hdr = list_to_text(csp->headers);
2576 * Memory is too tight to even generate the header.
2577 * Send our static "Out-of-memory" page.
2579 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2580 rsp = cgi_error_memory();
2581 send_crunch_response(csp, rsp);
2585 hdrlen = strlen(hdr);
2587 if (write_socket(csp->cfd, hdr, hdrlen)
2588 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2589 || (write_socket(csp->cfd, buf, (size_t)len)))
2591 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2598 * Reset the byte_count to the amount of bytes
2599 * we just flushed. len will be added a few lines below,
2600 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2602 byte_count = (size_t)flushed;
2604 content_filter = NULL;
2610 if (write_socket(csp->cfd, buf, (size_t)len))
2612 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2616 byte_count += (size_t)len;
2621 /* we're still looking for the end of the
2622 * server's header ... (does that make header
2623 * parsing an "out of body experience" ?
2627 * buffer up the data we just read. If that fails,
2628 * there's little we can do but send our static
2629 * out-of-memory page.
2631 if (add_to_iob(csp, buf, len))
2633 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2634 rsp = cgi_error_memory();
2635 send_crunch_response(csp, rsp);
2640 /* Convert iob into something sed() can digest */
2641 if (JB_ERR_PARSE == get_server_headers(csp))
2645 /* Well, we tried our MS IIS/5
2646 * hack and it didn't work.
2647 * The header is incomplete
2648 * and there isn't anything
2649 * we can do about it.
2655 /* Since we have to wait for
2656 * more from the server before
2657 * we can parse the headers
2658 * we just continue here.
2664 /* Did we actually get anything? */
2665 if (NULL == csp->headers->first)
2667 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2668 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2669 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2670 free_http_request(http);
2674 /* we have now received the entire header.
2675 * filter it and send the result to the client
2677 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2679 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2681 hdr = list_to_text(csp->headers);
2684 /* FIXME Should handle error properly */
2685 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2688 if (crunch_response_triggered(csp, crunchers_light))
2691 * One of the tags created by a server-header
2692 * tagger triggered a crunch. We already
2693 * delivered the crunch response to the client
2694 * and are done here after cleaning up.
2699 /* Buffer and pcrs filter this if appropriate. */
2701 if (!http->ssl) /* We talk plaintext */
2704 #ifdef FEATURE_KILL_POPUPS
2705 /* Start blocking popups if appropriate. */
2706 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2707 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2709 block_popups_now = 1;
2711 * Filter the part of the body that came in the same read
2712 * as the last headers:
2714 filter_popups(csp->iob->cur, csp);
2716 #endif /* def FEATURE_KILL_POPUPS */
2717 content_filter = get_filter_function(csp);
2720 * Only write if we're not buffering for content modification
2722 if (!content_filter)
2724 /* write the server's (modified) header to
2725 * the client (along with anything else that
2726 * may be in the buffer)
2729 if (write_socket(csp->cfd, hdr, strlen(hdr))
2730 || ((len = flush_socket(csp->cfd, csp)) < 0))
2732 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2734 /* the write failed, so don't bother
2735 * mentioning it to the client...
2736 * it probably can't hear us anyway.
2742 byte_count += (size_t)len;
2745 /* we're finished with the server's header */
2750 /* If this was a MS IIS/5 hack then it means
2751 * the server has already closed the
2752 * connection. Nothing more to read. Time
2763 return; /* huh? we should never get here */
2766 if (csp->content_length == 0)
2769 * If Privoxy didn't recalculate the
2770 * Content-Lenght, byte_count is still
2773 csp->content_length = byte_count;
2776 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2777 csp->ip_addr_str, http->ocmd, csp->content_length);
2781 /*********************************************************************
2785 * Description : This is little more than chat. We only "serve" to
2786 * to close any socket that chat may have opened.
2789 * 1 : csp = Current client state (buffers, headers, etc...)
2793 *********************************************************************/
2795 void serve(struct client_state *csp)
2796 #else /* ifndef AMIGA */
2797 static void serve(struct client_state *csp)
2798 #endif /* def AMIGA */
2801 close_socket(csp->cfd);
2803 if (csp->sfd != JB_INVALID_SOCKET)
2805 close_socket(csp->sfd);
2808 csp->flags &= ~CSP_FLAG_ACTIVE;
2814 /*********************************************************************
2816 * Function : server_thread
2818 * Description : We only exist to call `serve' in a threaded environment.
2821 * 1 : data = Current client state (buffers, headers, etc...)
2823 * Returns : Always 0.
2825 *********************************************************************/
2826 static int32 server_thread(void *data)
2828 serve((struct client_state *) data);
2836 /*********************************************************************
2840 * Description : Print usage info & exit.
2842 * Parameters : Pointer to argv[0] for identifying ourselves
2846 *********************************************************************/
2847 static void usage(const char *myname)
2849 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2853 #endif /* defined(unix) */
2856 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2857 #endif /* defined(unix) */
2858 "[--version] [configfile]\n"
2859 "Aborting\n", myname);
2864 #endif /* defined(unix) */
2867 /*********************************************************************
2869 * Function : initialize_mutexes
2871 * Description : Prepares mutexes if mutex support is available.
2875 * Returns : Void, exits in case of errors.
2877 *********************************************************************/
2878 static void initialize_mutexes(void)
2882 #ifdef FEATURE_PTHREAD
2884 * Prepare global mutex semaphores
2886 err = pthread_mutex_init(&log_mutex, 0);
2888 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2891 * XXX: The assumptions below are a bit naive
2892 * and can cause locks that aren't necessary.
2894 * For example older FreeBSD versions (< 6.x?)
2895 * have no gethostbyname_r, but gethostbyname is
2898 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2899 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2900 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2902 * XXX: should we use a single mutex for
2903 * localtime() and gmtime() as well?
2905 #ifndef HAVE_GMTIME_R
2906 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2907 #endif /* ndef HAVE_GMTIME_R */
2909 #ifndef HAVE_LOCALTIME_R
2910 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2911 #endif /* ndef HAVE_GMTIME_R */
2914 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2915 #endif /* ndef HAVE_RANDOM */
2916 #endif /* FEATURE_PTHREAD */
2919 * TODO: mutex support for mingw32 would be swell.
2924 printf("Fatal error. Mutex initialization failed: %s.\n",
2933 /*********************************************************************
2937 * Description : Load the config file and start the listen loop.
2938 * This function is a lot more *sane* with the `load_config'
2939 * and `listen_loop' functions; although it stills does
2940 * a *little* too much for my taste.
2943 * 1 : argc = Number of parameters (including $0).
2944 * 2 : argv = Array of (char *)'s to the parameters.
2946 * Returns : 1 if : can't open config file, unrecognized directive,
2947 * stats requested in multi-thread mode, can't open the
2948 * log file, can't open the jar file, listen port is invalid,
2949 * any load fails, and can't bind port.
2951 * Else main never returns, the process must be signaled
2952 * to terminate execution. Or, on Windows, use the
2953 * "File", "Exit" menu option.
2955 *********************************************************************/
2957 int real_main(int argc, const char *argv[])
2959 int main(int argc, const char *argv[])
2963 unsigned int random_seed;
2965 struct passwd *pw = NULL;
2966 struct group *grp = NULL;
2969 char *pre_chroot_nslookup_to_load_resolver = NULL;
2976 #if !defined(_WIN32)
2984 * Parse the command line arguments
2986 * XXX: simply printing usage information in case of
2987 * invalid arguments isn't particular user friendly.
2989 while (++argc_pos < argc)
2992 /* Check to see if the service must be installed or uninstalled */
2993 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2995 const char *pName = argv[argc_pos] + 9;
2998 exit( (install_service(pName)) ? 0 : 1 );
3000 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3002 const char *pName = argv[argc_pos] + 11;
3005 exit((uninstall_service(pName)) ? 0 : 1);
3007 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3009 bRunAsService = TRUE;
3010 w32_set_service_cwd();
3011 atexit(w32_service_exit_notify);
3014 #endif /* defined(_WIN32) */
3017 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3019 if (strcmp(argv[argc_pos], "--help") == 0)
3024 else if(strcmp(argv[argc_pos], "--version") == 0)
3026 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3032 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3037 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3039 if (++argc_pos == argc) usage(argv[0]);
3040 pidfile = strdup(argv[argc_pos]);
3043 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3045 if (++argc_pos == argc) usage(argv[argc_pos]);
3047 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3050 if (NULL == (grp = getgrnam(p)))
3052 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3056 if (NULL == (pw = getpwnam(argv[argc_pos])))
3058 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3061 if (p != NULL) *--p = '\0';
3064 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3066 if (++argc_pos == argc) usage(argv[0]);
3067 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3070 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3074 #endif /* defined(unix) */
3076 else if (argc_pos + 1 != argc)
3079 * This is neither the last command line
3080 * option, nor was it recognized before,
3081 * therefore it must be invalid.
3087 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3089 configfile = argv[argc_pos];
3092 } /* -END- while (more arguments) */
3095 if ( *configfile != '/' )
3097 char cwd[BUFFER_SIZE];
3099 size_t abs_file_size;
3101 /* make config-filename absolute here */
3102 if (NULL == getcwd(cwd, sizeof(cwd)))
3104 perror("failed to get current working directory");
3109 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3110 basedir = strdup(cwd);
3112 if (NULL == basedir ||
3113 NULL == (abs_file = malloc(abs_file_size)))
3115 perror("malloc failed");
3118 strlcpy(abs_file, basedir, abs_file_size);
3119 strlcat(abs_file, "/", abs_file_size );
3120 strlcat(abs_file, configfile, abs_file_size);
3121 configfile = abs_file;
3123 #endif /* defined unix */
3127 clients->next = NULL;
3129 /* XXX: factor out initialising after the next stable release. */
3132 #elif defined(_WIN32)
3136 /* Prepare mutexes if supported and necessary. */
3137 initialize_mutexes();
3139 /* Enable logging until further notice. */
3140 init_log_module(Argv[0]);
3142 random_seed = (unsigned int)time(NULL);
3144 srandom(random_seed);
3145 #elif defined (_WIN32)
3147 * See pick_from_range() in miscutil.c for details.
3149 log_error(LOG_LEVEL_INFO,
3150 "No thread-safe PRNG implemented for your platform. "
3151 "Using weak \'randomization\' factor which will "
3152 "limit the already questionable usefulness of "
3153 "header-time-randomizing actions (disabled by default).");
3156 #endif /* ifdef HAVE_RANDOM */
3159 * Unix signal handling
3161 * Catch the abort, interrupt and terminate signals for a graceful exit
3162 * Catch the hangup signal so the errlog can be reopened.
3163 * Ignore the broken pipe signals (FIXME: Why?)
3165 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3168 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3169 const int ignored_signals[] = { SIGPIPE, 0 };
3171 for (idx = 0; catched_signals[idx] != 0; idx++)
3173 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3174 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3176 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3177 #endif /* ifdef sun */
3179 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3183 for (idx = 0; ignored_signals[idx] != 0; idx++)
3185 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3187 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3192 #else /* ifdef _WIN32 */
3193 # ifdef _WIN_CONSOLE
3195 * We *are* in a windows console app.
3196 * Print a verbose messages about FAQ's and such
3198 printf("%s", win32_blurb);
3199 # endif /* def _WIN_CONSOLE */
3200 #endif /* def _WIN32 */
3203 /* Initialize the CGI subsystem */
3204 cgi_init_error_messages();
3207 * If runnig on unix and without the --nodaemon
3208 * option, become a daemon. I.e. fork, detach
3209 * from tty and get process group leadership
3222 if ( pid < 0 ) /* error */
3227 else if ( pid != 0 ) /* parent */
3232 * must check for errors
3233 * child died due to missing files aso
3236 wpid = waitpid( pid, &status, WNOHANG );
3245 /* Should be more portable, but not as well tested */
3250 #else /* ndef __FreeBSD__ */
3252 #endif /* ndef __FreeBSD__ */
3253 fd = open("/dev/tty", O_RDONLY);
3256 /* no error check here */
3257 ioctl( fd, TIOCNOTTY,0 );
3262 * stderr (fd 2) will be closed later on, when the
3263 * log file has been parsed.
3270 } /* -END- if (!no_daemon) */
3273 * As soon as we have written the PID file, we can switch
3274 * to the user and group ID indicated by the --user option
3280 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3282 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3288 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3290 /* Read the time zone file from /etc before doing chroot. */
3292 if (NULL != pre_chroot_nslookup_to_load_resolver
3293 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3295 /* Initialize resolver library. */
3296 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3298 if (chroot(pw->pw_dir) < 0)
3300 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3304 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3307 if (setuid(pw->pw_uid))
3309 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3313 char putenv_dummy[64];
3315 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3316 if (putenv(putenv_dummy) != 0)
3318 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3321 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3322 if (putenv(putenv_dummy) != 0)
3324 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3330 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3333 #endif /* defined unix */
3336 /* This will be FALSE unless the command line specified --service
3340 /* Yup, so now we must attempt to establish a connection
3341 * with the service dispatcher. This will only work if this
3342 * process was launched by the service control manager to
3343 * actually run as a service. If this isn't the case, i've
3344 * known it take around 30 seconds or so for the call to return.
3347 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3348 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3350 /* Service has run, and at this point is now being stopped, so just return */
3355 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3357 /* An error occurred. Usually it's because --service was wrongly specified
3358 * and we were unable to connect to the Service Control Dispatcher because
3359 * it wasn't expecting us and is therefore not listening.
3361 * For now, just continue below to call the listen_loop function.
3364 #endif /* def _WIN32 */
3374 /*********************************************************************
3376 * Function : bind_port_helper
3378 * Description : Bind the listen port. Handles logging, and aborts
3382 * 1 : config = Privoxy configuration. Specifies port
3385 * Returns : Port that was opened.
3387 *********************************************************************/
3388 static jb_socket bind_port_helper(struct configuration_spec * config)
3393 if ( (config->haddr != NULL)
3394 && (config->haddr[0] == '1')
3395 && (config->haddr[1] == '2')
3396 && (config->haddr[2] == '7')
3397 && (config->haddr[3] == '.') )
3399 log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
3402 else if (config->haddr == NULL)
3404 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3409 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3410 config->hport, config->haddr);
3413 result = bind_port(config->haddr, config->hport, &bfd);
3420 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3421 "There may be another Privoxy or some other "
3422 "proxy running on port %d",
3423 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3424 config->hport, config->hport);
3427 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3428 "The hostname is not resolvable",
3429 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3432 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3433 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3436 /* shouldn't get here */
3437 return JB_INVALID_SOCKET;
3440 config->need_bind = 0;
3447 /* Without this simple workaround we get this compiler warning from _beginthread
3448 * warning C4028: formal parameter 1 different from declaration
3450 void w32_service_listen_loop(void *p)
3454 #endif /* def _WIN32 */
3457 /*********************************************************************
3459 * Function : listen_loop
3461 * Description : bind the listen port and enter a "FOREVER" listening loop.
3467 *********************************************************************/
3468 static void listen_loop(void)
3470 struct client_state *csp = NULL;
3472 struct configuration_spec * config;
3474 config = load_config();
3476 bfd = bind_port_helper(config);
3478 #ifdef FEATURE_GRACEFUL_TERMINATION
3479 while (!g_terminate)
3484 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3485 while (waitpid(-1, NULL, WNOHANG) > 0)
3487 /* zombie children */
3489 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3492 * Free data that was used by died threads
3498 * Re-open the errlog after HUP signal
3500 if (received_hup_signal)
3502 init_error_log(Argv[0], config->logfile);
3503 received_hup_signal = 0;
3508 #ifdef FEATURE_COOKIE_JAR
3510 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3511 * already open. I think unload_configfile() is not being run, which should do
3512 * this work. Until that can get resolved, we'll use this workaround.
3516 if (csp->config->jar)
3518 fclose(csp->config->jar);
3519 csp->config->jar = NULL;
3521 #endif /* FEATURE_COOKIE_JAR */
3522 #endif /* __OS2__ */
3524 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3526 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3530 csp->flags |= CSP_FLAG_ACTIVE;
3531 csp->sfd = JB_INVALID_SOCKET;
3533 csp->config = config = load_config();
3535 if ( config->need_bind )
3538 * Since we were listening to the "old port", we will not see
3539 * a "listen" param change until the next IJB request. So, at
3540 * least 1 more request must be made for us to find the new
3541 * setting. I am simply closing the old socket and binding the
3544 * Which-ever is correct, we will serve 1 more page via the
3545 * old settings. This should probably be a "show-proxy-args"
3546 * request. This should not be a so common of an operation
3547 * that this will hurt people's feelings.
3552 bfd = bind_port_helper(config);
3555 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3557 if (!accept_connection(csp, bfd))
3559 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3572 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3575 #ifdef FEATURE_TOGGLE
3576 if (global_toggle_state)
3577 #endif /* def FEATURE_TOGGLE */
3579 csp->flags |= CSP_FLAG_TOGGLED_ON;
3582 if (run_loader(csp))
3584 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3585 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3589 if (block_acl(NULL,csp))
3591 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3592 close_socket(csp->cfd);
3596 #endif /* def FEATURE_ACL */
3598 /* add it to the list of clients */
3599 csp->next = clients->next;
3600 clients->next = csp;
3602 if (config->multi_threaded)
3606 /* this is a switch () statment in the C preprocessor - ugh */
3607 #undef SELECTED_ONE_OPTION
3609 /* Use Pthreads in preference to native code */
3610 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3611 #define SELECTED_ONE_OPTION
3613 pthread_t the_thread;
3614 pthread_attr_t attrs;
3616 pthread_attr_init(&attrs);
3617 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3618 errno = pthread_create(&the_thread, &attrs,
3619 (void * (*)(void *))serve, csp);
3620 child_id = errno ? -1 : 0;
3621 pthread_attr_destroy(&attrs);
3625 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3626 #define SELECTED_ONE_OPTION
3627 child_id = _beginthread(
3628 (void (*)(void *))serve,
3633 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3634 #define SELECTED_ONE_OPTION
3635 child_id = _beginthread(
3636 (void(* _Optlink)(void*))serve,
3642 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3643 #define SELECTED_ONE_OPTION
3645 thread_id tid = spawn_thread
3646 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3648 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3650 child_id = (int) tid;
3659 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3660 #define SELECTED_ONE_OPTION
3661 csp->cfd = ReleaseSocket(csp->cfd, -1);
3664 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3665 NP_Output, Output(),
3666 NP_CloseOutput, FALSE,
3667 NP_Name, (ULONG)"privoxy child",
3671 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3672 NP_Output, Output(),
3673 NP_CloseOutput, FALSE,
3674 NP_Name, (ULONG)"privoxy child",
3675 NP_StackSize, 200*1024,
3681 ((struct Task *)child_id)->tc_UserData = csp;
3682 Signal((struct Task *)child_id, SIGF_SINGLE);
3687 #if !defined(SELECTED_ONE_OPTION)
3690 /* This block is only needed when using fork().
3691 * When using threads, the server thread was
3692 * created and run by the call to _beginthread().
3694 if (child_id == 0) /* child */
3697 #ifdef FEATURE_TOGGLE
3698 int inherited_toggle_state = global_toggle_state;
3699 #endif /* def FEATURE_TOGGLE */
3704 * If we've been toggled or we've blocked the request, tell Mom
3707 #ifdef FEATURE_TOGGLE
3708 if (inherited_toggle_state != global_toggle_state)
3710 rc |= RC_FLAG_TOGGLED;
3712 #endif /* def FEATURE_TOGGLE */
3714 #ifdef FEATURE_STATISTICS
3715 if (csp->flags & CSP_FLAG_REJECTED)
3717 rc |= RC_FLAG_BLOCKED;
3719 #endif /* ndef FEATURE_STATISTICS */
3723 else if (child_id > 0) /* parent */
3725 /* in a fork()'d environment, the parent's
3726 * copy of the client socket and the CSP
3730 #if !defined(_WIN32) && !defined(__CYGWIN__)
3732 wait( &child_status );
3735 * Evaluate child's return code: If the child has
3736 * - been toggled, toggle ourselves
3737 * - blocked its request, bump up the stats counter
3740 #ifdef FEATURE_TOGGLE
3741 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3743 global_toggle_state = !global_toggle_state;
3745 #endif /* def FEATURE_TOGGLE */
3747 #ifdef FEATURE_STATISTICS
3749 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3753 #endif /* def FEATURE_STATISTICS */
3755 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3756 close_socket(csp->cfd);
3757 csp->flags &= ~CSP_FLAG_ACTIVE;
3761 #undef SELECTED_ONE_OPTION
3762 /* end of cpp switch () */
3764 if (child_id < 0) /* failed */
3766 char buf[BUFFER_SIZE];
3768 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3770 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3772 write_socket(csp->cfd, buf, strlen(buf));
3773 close_socket(csp->cfd);
3774 csp->flags &= ~CSP_FLAG_ACTIVE;
3785 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3787 /* Clean up. Aim: free all memory (no leaks) */
3788 #ifdef FEATURE_GRACEFUL_TERMINATION
3790 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3792 unload_current_config_file();
3793 unload_current_actions_file();
3794 unload_current_re_filterfile();
3795 #ifdef FEATURE_TRUST
3796 unload_current_trust_file();
3799 if (config->multi_threaded)
3806 } while ((clients->next != NULL) && (--i > 0));
3810 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3821 #ifdef FEATURE_COOKIE_JAR
3822 if (NULL != config->jar)
3824 fclose(config->jar);
3828 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3829 /* Cleanup - remove taskbar icon etc. */
3834 #endif /* FEATURE_GRACEFUL_TERMINATION */