1 const char jcc_rcs[] = "$Id: jcc.c,v 1.158 2007/11/11 16:44:17 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 1.158 2007/11/11 16:44:17 fabiankeil
37 * Emit a log message when activating the MS IIS5 hack.
39 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
40 * Log the "weak randomization factor" warning only
41 * once for mingw32 and provide some more details.
43 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
44 * Initialize log module after initializing mutexes, future
45 * deadlocks in that code should now work cross-platform.
47 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
48 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
49 * Reported by Bert van Leeuwen in BR#1818808.
51 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
52 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
54 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
55 * When in daemon mode, close stderr after the configuration file has been
56 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
58 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
59 * - Fix a crash when parsing invalid requests whose first header
60 * is rejected by get_header(). Regression (re?)introduced
61 * in r1.143 by yours truly.
62 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
63 * client_cookie_adder() to make sure send-vanilla-wafer can be
64 * controlled through tags (and thus regression-tested).
66 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
67 * - Move get_filter_function() from jcc.c to filters.c
68 * so the filter functions can be static.
69 * - Don't bother filtering body-less responses.
71 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
72 * Execute content filters through execute_content_filter().
74 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
75 * Initialize req to NULL to make sure it's defined if the
76 * first read_socket() call fails. Reported by icmp30.
78 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
79 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
80 * extensive comments moved to user manual.
82 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
83 * Don't crash if a broken header filter wiped out the request line.
85 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
86 * Fix byte_count calculation in case of flushes
87 * and don't parse the server headers a second time.
89 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
90 * - If there's a connection problem after we already forwarded
91 * parts of the original content, just hang up. Fixes BR#1776724.
92 * - Fix warnings about unused code on mingw32.
93 * - In case of flushes, calculate the byte count
94 * less incorrectly (I think).
96 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
97 * Add some more prototypes for static functions.
99 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
100 * Comment out request_contains_null_bytes() until it's used again.
102 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
103 * #1763173 from Stefan Huehner: s@const static@static const@
104 * and declare some more functions static.
106 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
107 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
108 * and explain why they were rejected in the first place.
109 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
110 * CONNECT requests. The request line was missing.
111 * - Add two more XXX reminders as we don't have enough already.
113 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
114 * As Hal noticed, checking dispatch_cgi() as the last cruncher
115 * looks like a bug if CGI requests are blocked unintentionally,
116 * so don't do it unless the user enabled the new config option
117 * "allow-cgi-request-crunching".
119 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
120 * - Allow to rewrite the request destination behind the client's back.
121 * - Turn the weird-looking unconditional for loop that
122 * reads the client request into a conditional while loop.
123 * Move the stuff that only runs once out of the loop.
124 * - Move parts of chat(), server_content_type() and the
125 * necessary stuff to fix BR#1750917 into get_filter_function().
127 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
128 * Temporary workaround for BR#1730105.
130 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
131 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
132 * deadlocks and crashes on OpenBSD and possibly other OS with neither
133 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
134 * Thanks to Ralf Horstmann for report and solution.
136 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
137 * Add forward-override{} to change the forwarding settings through
138 * action sections. This is mainly interesting to forward different
139 * clients differently (for example based on User-Agent or request
142 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
143 * - Let usage() mention the --chroot parameter.
144 * - Use read_socket() consistently and always leave
145 * the last buffer byte alone, even in cases where
146 * null termination (currently) doesn't matter.
148 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
149 * - Fix config file loading on Unix if no config file is specified.
150 * Since r1.97 Privoxy would always interpret the last argument as
151 * config file, even if it's a valid command line option.
152 * - Abort in case of unrecognized command line options. Closes #1719696.
153 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
154 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
156 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
157 * - Don't rerun crunchers that only depend on the request URL.
158 * - Don't count redirects and CGI requests as "blocked requests".
160 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
161 * Support crunching based on tags created by server-header taggers.
163 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
164 * Make HTTP snippets static (again). Add a Content-Type for those
165 * with content so the browser doesn't guess it based on the URL.
167 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
168 * Move crunching and request line rebuilding out of chat().
170 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
171 * Introduce tags as alternative way to specify which
172 * actions apply to a request. At the moment tags can be
173 * created based on client and server headers.
175 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
176 * Don't CLF-log CONNECT requests twice.
178 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
179 * Log the source address for ACL-related connection drops.
181 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
182 * New config option: enforce-blocks.
184 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
185 * - Move null byte check into separate function.
186 * - Don't confuse the client with error pages
187 * if a CONNECT request was already confirmed.
189 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
190 * Speed up NULL byte escaping and only log the complete
191 * NULL byte requests with header debugging enabled.
193 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
194 * Answer requests that contain NULL bytes with
195 * a custom response instead of waiting for more
196 * data until the client eventually hangs up.
198 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
199 * - Move delivery and logging of crunched responses
200 * from chat() into send_crunch_response().
201 * - Display the reason for generating http_responses.
202 * - Log the content length for LOG_LEVEL_CLF correctly
203 * (still incorrect for some fixed responses).
204 * - Reword an incorrect comment about
205 * treat-forbidden-connects-like-blocks violating
207 * - Add some log messages.
209 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
210 * Move mutex initialization into separate
211 * function and exit in case of errors.
213 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
214 * - Start to reduce chat()'s line count and move
215 * parts of it into separate functions.
216 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
218 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
219 * - Add Proxy-Agent header to HTTP snippets that are
220 * supposed to reach HTTP clients only.
221 * - Made a few CONNECT log messages more descriptive.
222 * - Catch completely empty server responses (as seen
223 * with Tor's fake ".noconnect" top level domain).
224 * - Use shiny new "forwarding-failed" template for socks errors.
226 * Revision 1.118 2007/01/07 07:43:43 joergs
227 * AmigaOS4 support added.
229 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
230 * Added config option accept-intercepted-requests
231 * and disabled it by default.
233 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
234 * Reverted parts of my last commit
235 * to keep error handling working.
237 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
238 * Fixed gcc43 conversion warnings.
240 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
241 * Fix -pedantic ISO C warning about converting
242 * from function pointer to object pointer.
244 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
245 * Silence compiler warning I introduced with my last commit.
247 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
248 * Mutex protect rand() if POSIX threading
249 * is used, warn the user if that's not possible
250 * and stop using it on _WIN32 where it could
253 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
254 * Don't prevent core dumps by catching SIGABRT.
255 * It's rude and makes debugging unreasonable painful.
257 * Revision 1.110 2006/12/13 14:52:53 etresoft
258 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
260 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
261 * Privoxy is now able to run as intercepting
262 * proxy in combination with any packet filter
263 * that does the port redirection. The destination
264 * is extracted from the "Host:" header which
265 * should be available for nearly all requests.
267 * Moved HTTP snipplets into jcc.c.
268 * Added error message for gopher proxy requests.
270 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
271 * Only unlink the pidfile if it's actually used.
273 * Change order of interception checks to make
274 * it possible to block or redirect requests for
277 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
278 * Make pthread mutex locking more generic. Instead of
279 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
280 * and use mutex locking unless there is an _r function
281 * available. Better safe than sorry.
283 * Fixes "./configure --disable-pthread" and should result
284 * in less threading-related problems on pthread-using platforms,
285 * but it still doesn't fix BR#1122404.
287 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
288 * Move pthread.h inclusion from jcc.c to jcc.h.
289 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
291 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
292 * Don't exit after receiving the second SIGHUP on Solaris.
294 * Fixes BR 1052235, but the same problem may exist on other
295 * systems. Once 3.0.6 is out we should use sigset()
296 * where available and see if it breaks anything.
298 * Revision 1.104 2006/09/23 13:26:38 roro
299 * Replace TABs by spaces in source code.
301 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
302 * Fix +redirect{}. Didn't work with -fast-redirects.
304 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
305 * Respond with 400 and a short text message
306 * if the client tries to use Privoxy as FTP proxy.
308 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
309 * Make number of retries in case of forwarded-connect problems
310 * a config file option (forwarded-connect-retries) and use 0 as
313 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
314 * Set random(3) seed.
316 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
317 * Follow the OpenBSD port's lead and protect the resolve
318 * functions on OpenBSD as well.
320 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
321 * --user fix. Only use the user as group if no group is specified.
322 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
324 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
325 * Windows service (re-)integration
329 * --install[:service_name]
330 * --uninstall[:service_name]
333 * They work as follows:
334 * --install will create a service for you and then terminate.
335 * By default the service name will be "privoxy" (without the quotes).
336 * However you can run multiple services if you wish, just by adding
337 * a colon and then a name (no spaces).
339 * --uninstall follows the exact same rules a --install.
341 * --service is used when the program is executed by the service
342 * control manager, and in normal circumstances would never be
343 * used as a command line argument.
345 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
346 * Windows service integration
348 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
349 * Incorporate Fabian Keil's patch work:
350 http://www.fabiankeil.de/sourcecode/privoxy/
352 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
353 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
354 * with what was really the latest development (the v_3_0_branch branch)
356 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
357 * Thanks to Jindrich Makovicka for a race condition fix for the log
358 * file. The race condition remains for non-pthread implementations.
359 * Reference patch #1175720.
361 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
362 * Add the ability to check jpeg images for invalid
363 * lengths of comment blocks. Defensive strategy
364 * against the exploit:
365 * Microsoft Security Bulletin MS04-028
366 * Buffer Overrun in JPEG Processing (GDI+) Could
367 * Allow Code Execution (833987)
368 * Enabled with +inspect-jpegs in actions files.
370 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
371 * - Fixed usage info for non-unix platforms
372 * - Fixed small cmdline parsing bug
374 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
375 * Diagnostics: Now preserve the returncode of pthread_create
376 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
378 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
379 * No longer ignore SIGCHLD. Fixes bug #769381
381 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
382 * Close jarfile on graceful exit, remove stray line
384 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
385 * Cosmetics: Killed a warning, a typo and an allocation left at exit
387 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
388 * No longer rely on non-POSIX.1 extensions of getcwd().
391 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
392 * Replaced setenv() by posix-compliant putenv()
393 * Thanks to Neil McCalden (nmcc AT users.sf.net).
395 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
396 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
398 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
399 * Clean-up and extension of improvements for forked mode:
400 * - Child's return code now consists of flags RC_FLAG_*
401 * - Reporting toggle to parent now properly #ifdef'ed
402 * - Children now report blocking to parent. This enables
403 * statistics in forked mode
405 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
406 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
407 * Children now report having been toggled through _exit(17), parents
408 * watch for that code and toggle themselves if found.
410 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
411 * Wrapping all *_r functions (the non-_r versions of them) with
412 * mutex semaphores for OSX. Hopefully this will take care of all
413 * of those pesky crash reports.
415 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
416 * Fixed two mostly harmless mem leaks
418 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
419 * Fix: Head of global clients list now initialized to NULL
421 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
422 * Added basic support for OPTIONS and TRACE HTTP methods:
423 * - New interceptor direct_response() added in chat().
424 * - sed() moved to earlier in the process, so that the
425 * Host: header is evaluated before actions and forwarding
428 * Revision 1.92 2002/05/08 16:00:46 oes
429 * Chat's buffer handling:
430 * - Fixed bug with unchecked out-of-mem conditions
431 * while reading client request & server headers
432 * - No longer predict if the buffer limit will be exceeded
433 * in the next read -- check add_to_iob's new
434 * return code. If buffer couldn't be extended
435 * (policy or out-of-mem) while
436 * - reading from client: abort
437 * - reading server headers: send error page
438 * - buffering server body for filter: flush,
439 * and if that fails: send error page
441 * Revision 1.91 2002/04/08 20:35:58 swa
444 * Revision 1.90 2002/04/02 14:57:28 oes
445 * Made sending wafers independent of FEATURE_COOKIE_JAR
447 * Revision 1.89 2002/03/31 17:18:59 jongfoster
448 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
450 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
451 * More compiler warning message maintenance
453 * Revision 1.87 2002/03/26 22:29:54 swa
454 * we have a new homepage!
456 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
457 * Workaround for closing the jarfile before load_config() comes around again
459 * Revision 1.85 2002/03/24 15:23:33 jongfoster
462 * Revision 1.84 2002/03/24 13:25:43 swa
463 * name change related issues
465 * Revision 1.83 2002/03/16 23:54:06 jongfoster
466 * Adding graceful termination feature, to help look for memory leaks.
467 * If you enable this (which, by design, has to be done by hand
468 * editing config.h) and then go to http://i.j.b/die, then the program
469 * will exit cleanly after the *next* request. It should free all the
470 * memory that was used.
472 * Revision 1.82 2002/03/13 00:27:05 jongfoster
475 * Revision 1.81 2002/03/12 01:42:50 oes
476 * Introduced modular filters
478 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
479 * OS/2 port maintenance:
480 * - Fixed EMX build - it had decayed a little
481 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
482 * substituted a memset for now.
484 * Revision 1.79 2002/03/09 20:03:52 jongfoster
485 * - Making various functions return int rather than size_t.
486 * (Undoing a recent change). Since size_t is unsigned on
487 * Windows, functions like read_socket that return -1 on
488 * error cannot return a size_t.
490 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
491 * crashes, and also frequently caused JB to jump to 100%
492 * CPU and stay there. (Because it thought it had just
493 * read ((unsigned)-1) == 4Gb of data...)
495 * - The signature of write_socket has changed, it now simply
496 * returns success=0/failure=nonzero.
498 * - Trying to get rid of a few warnings --with-debug on
499 * Windows, I've introduced a new type "jb_socket". This is
500 * used for the socket file descriptors. On Windows, this
501 * is SOCKET (a typedef for unsigned). Everywhere else, it's
502 * an int. The error value can't be -1 any more, so it's
503 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
504 * Windows it maps to the #define INVALID_SOCKET.)
506 * - The signature of bind_port has changed.
508 * Revision 1.78 2002/03/08 21:35:04 oes
509 * Added optional group supplement to --user option. Will now use default group of user if no group given
511 * Revision 1.77 2002/03/07 03:52:06 oes
512 * - Fixed compiler warnings etc
513 * - Improved handling of failed DNS lookups
515 * Revision 1.76 2002/03/06 22:54:35 jongfoster
516 * Automated function-comment nitpicking.
518 * Revision 1.75 2002/03/06 10:02:19 oes
519 * Fixed stupid bug when --user was not given
521 * Revision 1.74 2002/03/06 00:49:31 jongfoster
522 * Fixing warning on Windows
523 * Making #ifdefs that refer to the same variable consistently
524 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
526 * Revision 1.73 2002/03/05 23:57:30 hal9
527 * Stray character 's' on line 1618 was breaking build.
529 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
530 * - Re-enable OS/2 building after new parms were added
531 * - Fix false out of memory report when resolving CGI templates when no IP
532 * address is available of failed attempt (a la no such domain)
534 * Revision 1.71 2002/03/05 18:13:56 oes
535 * Added --user option
537 * Revision 1.70 2002/03/05 04:52:42 oes
538 * Deleted non-errlog debugging code
540 * Revision 1.69 2002/03/04 23:50:00 jongfoster
541 * Splitting off bind_port() call into bind_port_helper(), with
544 * Revision 1.68 2002/03/04 20:17:32 oes
547 * Revision 1.67 2002/03/04 18:18:57 oes
548 * - Removed _DEBUG mode
549 * - Cleand up cmdline parsing
550 * - Introduced --no-daemon, --pidfile options
551 * - Cleaned up signal handling:
552 * - Terminate cleanly on INT, TERM and ABRT
553 * - Schedule logfile for re-opening on HUP
554 * - Ignore CHLD and PIPE
555 * - Leave the rest with their default handlers
556 * - Uniform handler registration
557 * - Added usage() function
558 * - Played styleguide police
560 * Revision 1.66 2002/03/03 15:06:55 oes
561 * Re-enabled automatic config reloading
563 * Revision 1.65 2002/03/03 14:49:11 oes
564 * Fixed CLF logging: Now uses client's original HTTP request
566 * Revision 1.64 2002/03/03 09:18:03 joergs
567 * Made jumbjuster work on AmigaOS again.
569 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
570 * Clean up a little CRLF unpleasantness that suddenly appeared
572 * Revision 1.62 2002/02/20 23:17:23 jongfoster
573 * Detecting some out-of memory conditions and exiting with a log message.
575 * Revision 1.61 2002/01/17 21:01:52 jongfoster
576 * Moving all our URL and URL pattern parsing code to urlmatch.c.
578 * Revision 1.60 2001/12/30 14:07:32 steudten
579 * - Add signal handling (unix)
580 * - Add SIGHUP handler (unix)
581 * - Add creation of pidfile (unix)
582 * - Add action 'top' in rc file (RH)
583 * - Add entry 'SIGNALS' to manpage
584 * - Add exit message to logfile (unix)
586 * Revision 1.59 2001/12/13 14:07:18 oes
587 * Fixed Bug: 503 error page now sent OK
589 * Revision 1.58 2001/11/30 23:37:24 jongfoster
590 * Renaming the Win32 config file to config.txt - this is almost the
591 * same as the corresponding UNIX name "config"
593 * Revision 1.57 2001/11/16 00:47:43 jongfoster
594 * Changing the tty-disconnection code to use setsid().
596 * Revision 1.56 2001/11/13 20:20:54 jongfoster
597 * Tabs->spaces, fixing a bug with missing {} around an if()
599 * Revision 1.55 2001/11/13 20:14:53 jongfoster
600 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
602 * Revision 1.54 2001/11/07 00:03:14 steudten
603 * Give reliable return value if an error
604 * occurs not just 0 with new daemon mode.
606 * Revision 1.53 2001/11/05 21:41:43 steudten
607 * Add changes to be a real daemon just for unix os.
608 * (change cwd to /, detach from controlling tty, set
609 * process group and session leader to the own process.
611 * Add some fatal-error log message for failed malloc().
612 * Add '-d' if compiled with 'configure --with-debug' to
613 * enable debug output.
615 * Revision 1.52 2001/10/26 20:11:20 jongfoster
616 * Fixing type mismatch
618 * Revision 1.51 2001/10/26 17:38:28 oes
621 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
622 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
623 * threads to call select() simultaneously. So, it's time to do a real, live,
624 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
625 * (native). Both versions will work, but using __OS2__ offers multi-threading.
627 * Revision 1.49 2001/10/23 21:41:35 jongfoster
628 * Added call to initialize the (statically-allocated of course)
629 * "out of memory" CGI response.
631 * Revision 1.48 2001/10/10 19:56:46 jongfoster
632 * Moving some code that wasn't cookie-related out of an #ifdef
635 * Revision 1.47 2001/10/10 16:44:36 oes
636 * Added CONNECT destination port limitation check
638 * Revision 1.46 2001/10/08 15:17:41 oes
639 * Re-enabled SSL forwarding
641 * Revision 1.45 2001/10/07 15:42:11 oes
642 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
644 * Moved downgrading of the HTTP version from parse_http_request to
645 * chat(), since we can't decide if it is necessary before we have
646 * determined the actions for the URL. The HTTP command is now
647 * *always* re-built so the repairs need no longer be special-cased.
649 * filter_popups now gets a csp pointer so it can raise the new
650 * CSP_FLAG_MODIFIED flag.
654 * Added configurable size limit for the IOB. If the IOB grows so
655 * large that the next read would exceed the limit, the header
656 * is generated, and the header & unfiltered buffer are flushed
657 * to the client. Chat then continues in non-buffering,
658 * non-filtering body mode.
660 * Revision 1.44 2001/10/02 18:13:57 oes
663 * Revision 1.43 2001/10/02 15:32:13 oes
664 * Moved generation of hdr
666 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
667 * Cleaning up 2 compiler warnings on OS/2.
669 * Revision 1.41 2001/09/16 17:05:14 jongfoster
670 * Removing unused #include showarg.h
672 * Revision 1.40 2001/09/16 15:41:45 jongfoster
673 * Fixing signed/unsigned comparison warning.
675 * Revision 1.39 2001/09/16 13:21:27 jongfoster
676 * Changes to use new list functions.
678 * Revision 1.38 2001/09/16 13:01:46 jongfoster
679 * Removing redundant function call that zeroed zalloc()'d memory.
681 * Revision 1.37 2001/09/10 11:12:24 oes
682 * Deleted unused variable
684 * Revision 1.36 2001/09/10 10:56:15 oes
685 * Silenced compiler warnings
687 * Revision 1.35 2001/07/31 14:44:22 oes
688 * Deleted unused size parameter from filter_popups()
690 * Revision 1.34 2001/07/30 22:08:36 jongfoster
691 * Tidying up #defines:
692 * - All feature #defines are now of the form FEATURE_xxx
693 * - Permanently turned off WIN_GUI_EDIT
694 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
696 * Revision 1.33 2001/07/29 19:32:00 jongfoster
697 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
699 * Revision 1.32 2001/07/29 18:47:05 jongfoster
700 * Adding missing #include "loadcfg.h"
702 * Revision 1.31 2001/07/29 12:17:48 oes
703 * Applied pthread fix by Paul Lieverse
705 * Revision 1.30 2001/07/25 22:57:13 jongfoster
706 * __BEOS__ no longer overrides FEATURE_PTHREAD.
707 * This is because FEATURE_PTHREAD will soon be widely used, so I
708 * want to keep it simple.
710 * Revision 1.29 2001/07/24 12:47:06 oes
711 * Applied BeOS support update by Eugenia
713 * Revision 1.28 2001/07/23 13:26:12 oes
714 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
716 * Revision 1.27 2001/07/19 19:09:47 haroon
717 * - Added code to take care of the situation where while processing the first
718 * server response (which includes the server header), after finding the end
719 * of the headers we were not looking past the end of the headers for
720 * content modification. I enabled it for filter_popups.
721 * Someone else should look to see if other similar operations should be
722 * done to the discarded portion of the buffer.
724 * Note 2001/07/20: No, the other content modification mechanisms will process
725 * the whole iob later anyway. --oes
727 * Revision 1.26 2001/07/18 12:31:36 oes
730 * Revision 1.25 2001/07/15 19:43:49 jongfoster
731 * Supports POSIX threads.
732 * Also removed some unused #includes.
734 * Revision 1.24 2001/07/13 14:00:40 oes
735 * - Generic content modification scheme:
736 * Each feature has its own applicability flag that is set
737 * from csp->action->flags.
738 * Replaced the "filtering" int flag , by a function pointer
739 * "content_filter" to the function that will do the content
740 * modification. If it is != NULL, the document will be buffered
741 * and processed through *content_filter, which must set
742 * csp->content_length and return a modified copy of the body
743 * or return NULL (on failiure).
744 * - Changed csp->is_text to the more generic bitmap csp->content_type
745 * which can currently take the valued CT_TEXT or CT_GIF
747 * - Removed all #ifdef PCRS
749 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
750 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
751 * the `block_acl' call. This prevents a compilation error when the user
752 * does not wish to use the "ACL" feature.
754 * Revision 1.22 2001/06/29 21:45:41 oes
755 * Indentation, CRLF->LF, Tab-> Space
757 * Revision 1.21 2001/06/29 13:29:36 oes
758 * - Cleaned up, improved comments
759 * - Unified all possible interceptors (CGI,
760 * block, trust, fast_redirect) in one
761 * place, with one (CGI) answer generation
762 * mechansim. Much clearer now.
763 * - Removed the GIF image generation, which
764 * is now done in filters.c:block_url()
765 * - Made error conditions like domain lookup
766 * failiure or (various) problems while talking
767 * to the server use cgi.c:error_response()
768 * instead of generating HTML/HTTP in chat() (yuck!)
769 * - Removed logentry from cancelled commit
771 * Revision 1.20 2001/06/09 10:55:28 jongfoster
772 * Changing BUFSIZ ==> BUFFER_SIZE
774 * Revision 1.19 2001/06/07 23:12:52 jongfoster
775 * Replacing function pointer in struct gateway with a directly
776 * called function forwarded_connect().
777 * Replacing struct gateway with struct forward_spec
779 * Revision 1.18 2001/06/03 19:12:16 oes
780 * introduced new cgi handling
782 * Revision 1.17 2001/06/01 20:07:23 jongfoster
783 * Now uses action +image-blocker{} rather than config->tinygif
785 * Revision 1.16 2001/06/01 18:49:17 jongfoster
786 * Replaced "list_share" with "list" - the tiny memory gain was not
787 * worth the extra complexity.
789 * Revision 1.15 2001/05/31 21:24:47 jongfoster
790 * Changed "permission" to "action" throughout.
791 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
792 * Moved vanilla wafer check into chat(), since we must now
793 * decide whether or not to add it based on the URL.
795 * Revision 1.14 2001/05/29 20:14:01 joergs
796 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
799 * Revision 1.13 2001/05/29 09:50:24 jongfoster
800 * Unified blocklist/imagelist/permissionslist.
801 * File format is still under discussion, but the internal changes
804 * Also modified interceptor behaviour:
805 * - We now intercept all URLs beginning with one of the following
806 * prefixes (and *only* these prefixes):
808 * * http://ijbswa.sf.net/config/
809 * * http://ijbswa.sourceforge.net/config/
810 * - New interceptors "home page" - go to http://i.j.b/ to see it.
811 * - Internal changes so that intercepted and fast redirect pages
812 * are not replaced with an image.
813 * - Interceptors now have the option to send a binary page direct
814 * to the client. (i.e. ijb-send-banner uses this)
815 * - Implemented show-url-info interceptor. (Which is why I needed
816 * the above interceptors changes - a typical URL is
817 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
818 * The previous mechanism would not have intercepted that, and
819 * if it had been intercepted then it then it would have replaced
822 * Revision 1.12 2001/05/27 22:17:04 oes
824 * - re_process_buffer no longer writes the modified buffer
825 * to the client, which was very ugly. It now returns the
826 * buffer, which it is then written by chat.
828 * - content_length now adjusts the Content-Length: header
829 * for modified documents rather than crunch()ing it.
830 * (Length info in csp->content_length, which is 0 for
831 * unmodified documents)
833 * - For this to work, sed() is called twice when filtering.
835 * Revision 1.11 2001/05/26 17:27:53 jongfoster
836 * Added support for CLF and fixed LOG_LEVEL_LOG.
837 * Also did CRLF->LF fix of my previous patch.
839 * Revision 1.10 2001/05/26 15:26:15 jongfoster
840 * ACL feature now provides more security by immediately dropping
841 * connections from untrusted hosts.
843 * Revision 1.9 2001/05/26 00:28:36 jongfoster
844 * Automatic reloading of config file.
845 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
846 * Most of the global variables have been moved to a new
847 * struct configuration_spec, accessed through csp->config->globalname
848 * Most of the globals remaining are used by the Win32 GUI.
850 * Revision 1.8 2001/05/25 22:43:18 jongfoster
851 * Fixing minor memory leak and buffer overflow.
853 * Revision 1.7 2001/05/25 22:34:30 jongfoster
856 * Revision 1.6 2001/05/23 00:13:58 joergs
857 * AmigaOS support fixed.
859 * Revision 1.5 2001/05/22 18:46:04 oes
861 * - Enabled filtering banners by size rather than URL
862 * by adding patterns that replace all standard banner
863 * sizes with the "Junkbuster" gif to the re_filterfile
865 * - Enabled filtering WebBugs by providing a pattern
866 * which kills all 1x1 images
868 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
869 * which is selected by the (nonstandard and therefore
870 * capital) letter 'U' in the option string.
871 * It causes the quantifiers to be ungreedy by default.
872 * Appending a ? turns back to greedy (!).
874 * - Added a new interceptor ijb-send-banner, which
875 * sends back the "Junkbuster" gif. Without imagelist or
876 * MSIE detection support, or if tinygif = 1, or the
877 * URL isn't recognized as an imageurl, a lame HTML
878 * explanation is sent instead.
880 * - Added new feature, which permits blocking remote
881 * script redirects and firing back a local redirect
883 * The feature is conditionally compiled, i.e. it
884 * can be disabled with --disable-fast-redirects,
885 * plus it must be activated by a "fast-redirects"
886 * line in the config file, has its own log level
887 * and of course wants to be displayed by show-proxy-args
888 * Note: Boy, all the #ifdefs in 1001 locations and
889 * all the fumbling with configure.in and acconfig.h
890 * were *way* more work than the feature itself :-(
892 * - Because a generic redirect template was needed for
893 * this, tinygif = 3 now uses the same.
895 * - Moved GIFs, and other static HTTP response templates
900 * - Removed some >400 CRs again (Jon, you really worked
903 * Revision 1.4 2001/05/21 19:34:01 jongfoster
904 * Made failure to bind() a fatal error.
906 * Revision 1.3 2001/05/20 01:21:20 jongfoster
907 * Version 2.9.4 checkin.
908 * - Merged popupfile and cookiefile, and added control over PCRS
909 * filtering, in new "permissionsfile".
910 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
911 * file error you now get a message box (in the Win32 GUI) rather
912 * than the program exiting with no explanation.
913 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
915 * - Removed tabs from "config"
916 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
917 * - Bumped up version number.
919 * Revision 1.2 2001/05/17 22:34:44 oes
920 * - Added hint on GIF char array generation to jcc.c
921 * - Cleaned CRLF's from the sources and related files
922 * - Repaired logging for REF and FRC
924 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
925 * Initial import of version 2.9.3 source tree
928 *********************************************************************/
934 #include <sys/types.h>
943 # ifndef FEATURE_PTHREAD
947 # include <windows.h>
948 # include <process.h>
949 # endif /* ndef FEATURE_PTHREAD */
952 # ifndef _WIN_CONSOLE
954 # endif /* ndef _WIN_CONSOLE */
955 # include "w32svrapi.h"
957 #else /* ifndef _WIN32 */
959 # if !defined (__OS2__)
961 # include <sys/wait.h>
962 # endif /* ndef __OS2__ */
963 # include <sys/time.h>
964 # include <sys/stat.h>
965 # include <sys/ioctl.h>
968 #include <sys/termios.h>
979 # include <socket.h> /* BeOS has select() for sockets only. */
980 # include <OS.h> /* declarations for threads and stuff. */
983 # if defined(__EMX__) || defined(__OS2__)
984 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
989 #define bzero(B,N) memset(B,0x00,n)
1001 #include "filters.h"
1002 #include "loaders.h"
1003 #include "parsers.h"
1004 #include "killpopup.h"
1005 #include "miscutil.h"
1007 #include "jbsockets.h"
1008 #include "gateway.h"
1009 #include "actions.h"
1011 #include "loadcfg.h"
1012 #include "urlmatch.h"
1014 const char jcc_h_rcs[] = JCC_H_VERSION;
1015 const char project_h_rcs[] = PROJECT_H_VERSION;
1018 struct client_state clients[1];
1019 struct file_list files[1];
1021 #ifdef FEATURE_STATISTICS
1022 int urls_read = 0; /* total nr of urls read inc rejected */
1023 int urls_rejected = 0; /* total nr of urls rejected */
1024 #endif /* def FEATURE_STATISTICS */
1026 #ifdef FEATURE_GRACEFUL_TERMINATION
1027 int g_terminate = 0;
1030 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1031 static void sig_handler(int the_signal);
1033 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1034 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1035 static jb_err get_server_headers(struct client_state *csp);
1036 static const char *crunch_reason(const struct http_response *rsp);
1037 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1039 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1041 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1042 static jb_err change_request_destination(struct client_state *csp);
1043 static void chat(struct client_state *csp);
1044 static void serve(struct client_state *csp);
1046 static void usage(const char *myname);
1048 static void initialize_mutexes(void);
1049 static jb_socket bind_port_helper(struct configuration_spec *config);
1050 static void listen_loop(void);
1053 void serve(struct client_state *csp);
1054 #else /* ifndef AMIGA */
1055 static void serve(struct client_state *csp);
1056 #endif /* def AMIGA */
1059 static int32 server_thread(void *data);
1060 #endif /* def __BEOS__ */
1063 #define sleep(N) Sleep(((N) * 1000))
1067 #define sleep(N) DosSleep(((N) * 100))
1070 #ifdef FEATURE_PTHREAD
1071 pthread_mutex_t log_mutex;
1072 pthread_mutex_t log_init_mutex;
1074 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1075 pthread_mutex_t resolver_mutex;
1076 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1078 #ifndef HAVE_GMTIME_R
1079 pthread_mutex_t gmtime_mutex;
1080 #endif /* ndef HAVE_GMTIME_R */
1082 #ifndef HAVE_LOCALTIME_R
1083 pthread_mutex_t localtime_mutex;
1084 #endif /* ndef HAVE_GMTIME_R */
1087 pthread_mutex_t rand_mutex;
1088 #endif /* ndef HAVE_RANDOM */
1090 #endif /* FEATURE_PTHREAD */
1092 #if defined(unix) || defined(__EMX__)
1093 const char *basedir = NULL;
1094 const char *pidfile = NULL;
1095 int received_hup_signal = 0;
1096 #endif /* defined unix */
1098 /* HTTP snipplets. */
1099 static const char CSUCCEED[] =
1100 "HTTP/1.0 200 Connection established\r\n"
1101 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1103 static const char CHEADER[] =
1104 "HTTP/1.0 400 Invalid header received from client\r\n"
1105 "Proxy-Agent: Privoxy " VERSION "\r\n"
1106 "Content-Type: text/plain\r\n"
1107 "Connection: close\r\n\r\n"
1108 "Invalid header received from client.\r\n";
1110 static const char CFORBIDDEN[] =
1111 "HTTP/1.0 403 Connection not allowable\r\n"
1112 "Proxy-Agent: Privoxy " VERSION "\r\n"
1113 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1114 "Connection: close\r\n\r\n";
1116 static const char FTP_RESPONSE[] =
1117 "HTTP/1.0 400 Invalid request received from client\r\n"
1118 "Content-Type: text/plain\r\n"
1119 "Connection: close\r\n\r\n"
1120 "Invalid request. Privoxy doesn't support FTP.\r\n";
1122 static const char GOPHER_RESPONSE[] =
1123 "HTTP/1.0 400 Invalid request received from client\r\n"
1124 "Content-Type: text/plain\r\n"
1125 "Connection: close\r\n\r\n"
1126 "Invalid request. Privoxy doesn't support gopher.\r\n";
1128 /* XXX: should be a template */
1129 static const char MISSING_DESTINATION_RESPONSE[] =
1130 "HTTP/1.0 400 Bad request received from client\r\n"
1131 "Proxy-Agent: Privoxy " VERSION "\r\n"
1132 "Content-Type: text/plain\r\n"
1133 "Connection: close\r\n\r\n"
1134 "Bad request. Privoxy was unable to extract the destination.\r\n";
1136 /* XXX: should be a template */
1137 static const char NO_SERVER_DATA_RESPONSE[] =
1138 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1139 "Proxy-Agent: Privoxy " VERSION "\r\n"
1140 "Content-Type: text/plain\r\n"
1141 "Connection: close\r\n\r\n"
1142 "Empty server or forwarder response.\r\n"
1143 "The connection was closed without sending any data.\r\n";
1146 /* XXX: should be a template */
1147 static const char NULL_BYTE_RESPONSE[] =
1148 "HTTP/1.0 400 Bad request received from client\r\n"
1149 "Proxy-Agent: Privoxy " VERSION "\r\n"
1150 "Content-Type: text/plain\r\n"
1151 "Connection: close\r\n\r\n"
1152 "Bad request. Null byte(s) before end of request.\r\n";
1155 /* XXX: should be a template */
1156 static const char MESSED_UP_REQUEST_RESPONSE[] =
1157 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1158 "Proxy-Agent: Privoxy " VERSION "\r\n"
1159 "Content-Type: text/plain\r\n"
1160 "Connection: close\r\n\r\n"
1161 "Bad request. Messed up with header filters.\r\n";
1163 /* A function to crunch a response */
1164 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1166 /* Crunch function flags */
1167 #define CF_NO_FLAGS 0
1168 /* Cruncher applies to forced requests as well */
1169 #define CF_IGNORE_FORCE 1
1170 /* Crunched requests are counted for the block statistics */
1171 #define CF_COUNT_AS_REJECT 2
1173 /* A crunch function and its flags */
1176 const crunch_func_ptr cruncher;
1180 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1182 /* Complete list of cruncher functions */
1183 static const struct cruncher crunchers_all[] = {
1184 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1185 { block_url, CF_COUNT_AS_REJECT },
1186 #ifdef FEATURE_TRUST
1187 { trust_url, CF_COUNT_AS_REJECT },
1188 #endif /* def FEATURE_TRUST */
1189 { redirect_url, CF_NO_FLAGS },
1190 { dispatch_cgi, CF_IGNORE_FORCE},
1194 /* Light version, used after tags are applied */
1195 static const struct cruncher crunchers_light[] = {
1196 { block_url, CF_COUNT_AS_REJECT },
1197 { redirect_url, CF_NO_FLAGS },
1202 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1203 /*********************************************************************
1205 * Function : sig_handler
1207 * Description : Signal handler for different signals.
1208 * Exit gracefully on TERM and INT
1209 * or set a flag that will cause the errlog
1210 * to be reopened by the main thread on HUP.
1213 * 1 : the_signal = the signal cause this function to call
1217 *********************************************************************/
1218 static void sig_handler(int the_signal)
1224 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1235 received_hup_signal = 1;
1240 * We shouldn't be here, unless we catch signals
1241 * in main() that we can't handle here!
1243 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1251 /*********************************************************************
1253 * Function : client_protocol_is_unsupported
1255 * Description : Checks if the client used a known unsupported
1256 * protocol and deals with it by sending an error
1260 * 1 : csp = Current client state (buffers, headers, etc...)
1261 * 2 : req = the first request line send by the client
1263 * Returns : TRUE if an error response has been generated, or
1264 * FALSE if the request doesn't look invalid.
1266 *********************************************************************/
1267 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1269 char buf[BUFFER_SIZE];
1272 * If it's a FTP or gopher request, we don't support it.
1274 * These checks are better than nothing, but they might
1275 * not work in all configurations and some clients might
1276 * have problems digesting the answer.
1278 * They should, however, never cause more problems than
1279 * Privoxy's old behaviour (returning the misleading HTML
1282 * "Could not resolve http://(ftp|gopher)://example.org").
1284 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1286 if (!strncmpic(req, "GET ftp://", 10))
1288 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1289 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1290 csp->ip_addr_str, req);
1294 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1295 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1296 csp->ip_addr_str, req);
1298 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1300 write_socket(csp->cfd, buf, strlen(buf));
1309 /*********************************************************************
1311 * Function : get_request_destination_elsewhere
1313 * Description : If the client's request was redirected into
1314 * Privoxy without the client's knowledge,
1315 * the request line lacks the destination host.
1317 * This function tries to get it elsewhere,
1318 * provided accept-intercepted-requests is enabled.
1320 * "Elsewhere" currently only means "Host: header",
1321 * but in the future we may ask the redirecting
1322 * packet filter to look the destination up.
1324 * If the destination stays unknown, an error
1325 * response is send to the client and headers
1326 * are freed so that chat() can return directly.
1329 * 1 : csp = Current client state (buffers, headers, etc...)
1330 * 2 : headers = a header list
1332 * Returns : JB_ERR_OK if the destination is now known, or
1333 * JB_ERR_PARSE if it isn't.
1335 *********************************************************************/
1336 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1340 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1342 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1343 " Privoxy isn't configured to accept intercepted requests.",
1344 csp->ip_addr_str, csp->http->cmd);
1345 /* XXX: Use correct size */
1346 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1347 csp->ip_addr_str, csp->http->cmd);
1349 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1350 destroy_list(headers);
1352 return JB_ERR_PARSE;
1354 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1356 /* Split the domain we just got for pattern matching */
1357 init_domain_components(csp->http);
1363 /* We can't work without destination. Go spread the news.*/
1365 req = list_to_text(headers);
1367 /* XXX: Use correct size */
1368 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1369 csp->ip_addr_str, csp->http->cmd);
1370 log_error(LOG_LEVEL_ERROR,
1371 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1372 csp->ip_addr_str, csp->http->cmd, req);
1375 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1376 destroy_list(headers);
1378 return JB_ERR_PARSE;
1381 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1382 * to get the destination IP address, use it as host directly
1383 * or do a reverse DNS lookup first.
1388 /*********************************************************************
1390 * Function : get_server_headers
1392 * Description : Parses server headers in iob and fills them
1393 * into csp->headers so that they can later be
1397 * 1 : csp = Current client state (buffers, headers, etc...)
1399 * Returns : JB_ERR_OK if everything went fine, or
1400 * JB_ERR_PARSE if the headers were incomplete.
1402 *********************************************************************/
1403 static jb_err get_server_headers(struct client_state *csp)
1405 int continue_hack_in_da_house = 0;
1408 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1413 * continue hack in da house. Ignore the ending of
1414 * this head and continue enlisting header lines.
1415 * The reason is described below.
1417 enlist(csp->headers, "");
1418 continue_hack_in_da_house = 0;
1421 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1424 * It's a bodyless continue response, don't
1425 * stop header parsing after reaching it's end.
1427 * As a result Privoxy will concatenate the
1428 * next response's head and parse and deliver
1429 * the headers as if they belonged to one request.
1431 * The client will separate them because of the
1432 * empty line between them.
1434 * XXX: What we're doing here is clearly against
1435 * the intended purpose of the continue header,
1436 * and under some conditions (HTTP/1.0 client request)
1437 * it's a standard violation.
1439 * Anyway, "sort of against the spec" is preferable
1440 * to "always getting confused by Continue responses"
1441 * (Privoxy's behaviour before this hack was added)
1443 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1444 continue_hack_in_da_house = 1;
1446 else if (*header == '\0')
1449 * If the header is empty, but the Continue hack
1450 * isn't active, we can assume that we reached the
1451 * end of the buffer before we hit the end of the
1454 * Inform the caller an let it decide how to handle it.
1456 return JB_ERR_PARSE;
1460 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1463 * XXX: Should we quit the request and return a
1464 * out of memory error page instead?
1466 log_error(LOG_LEVEL_ERROR,
1467 "Out of memory while enlisting server headers. %s lost.",
1477 /*********************************************************************
1479 * Function : crunch_reason
1481 * Description : Translates the crunch reason code into a string.
1484 * 1 : rsp = a http_response
1486 * Returns : A string with the crunch reason or an error description.
1488 *********************************************************************/
1489 static const char *crunch_reason(const struct http_response *rsp)
1491 char * reason = NULL;
1493 assert(rsp != NULL);
1496 return "Internal error while searching for crunch reason";
1499 switch (rsp->reason)
1501 case RSP_REASON_UNSUPPORTED:
1502 reason = "Unsupported HTTP feature";
1504 case RSP_REASON_BLOCKED:
1507 case RSP_REASON_UNTRUSTED:
1508 reason = "Untrusted";
1510 case RSP_REASON_REDIRECTED:
1511 reason = "Redirected";
1513 case RSP_REASON_CGI_CALL:
1514 reason = "CGI Call";
1516 case RSP_REASON_NO_SUCH_DOMAIN:
1517 reason = "DNS failure";
1519 case RSP_REASON_FORWARDING_FAILED:
1520 reason = "Forwarding failed";
1522 case RSP_REASON_CONNECT_FAILED:
1523 reason = "Connection failure";
1525 case RSP_REASON_OUT_OF_MEMORY:
1526 reason = "Out of memory (may mask other reasons)";
1529 reason = "No reason recorded";
1537 /*********************************************************************
1539 * Function : send_crunch_response
1541 * Description : Delivers already prepared response for
1542 * intercepted requests, logs the interception
1543 * and frees the response.
1546 * 1 : csp = Current client state (buffers, headers, etc...)
1547 * 1 : rsp = Fully prepared response. Will be freed on exit.
1549 * Returns : Nothing.
1551 *********************************************************************/
1552 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1554 const struct http_request *http = csp->http;
1555 char status_code[4];
1557 assert(rsp != NULL);
1558 assert(rsp->head != NULL);
1563 * Not supposed to happen. If it does
1564 * anyway, treat it as an unknown error.
1566 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1567 /* return code doesn't matter */
1572 /* If rsp is still NULL, we have serious internal problems. */
1573 log_error(LOG_LEVEL_FATAL,
1574 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1578 * Extract the status code from the actual head
1579 * that was send to the client. It is the only
1580 * way to get it right for all requests, including
1581 * the fixed ones for out-of-memory problems.
1583 * A head starts like this: 'HTTP/1.1 200...'
1587 status_code[0] = rsp->head[9];
1588 status_code[1] = rsp->head[10];
1589 status_code[2] = rsp->head[11];
1590 status_code[3] = '\0';
1592 /* Write the answer to the client */
1593 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1594 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1596 /* There is nothing we can do about it. */
1597 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1600 /* Log that the request was crunched and why. */
1601 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1602 http->hostport, http->path, crunch_reason(rsp));
1603 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1604 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1606 /* Clean up and return */
1607 if (cgi_error_memory() != rsp)
1609 free_http_response(rsp);
1616 /*********************************************************************
1618 * Function : request_contains_null_bytes
1620 * Description : Checks for NULL bytes in the request and sends
1621 * an error message to the client if any were found.
1623 * XXX: currently not used, see comment in chat().
1626 * 1 : csp = Current client state (buffers, headers, etc...)
1627 * 2 : buf = Data from the client's request to check.
1628 * 3 : len = The data length.
1630 * Returns : TRUE if the request contained one or more NULL bytes, or
1633 *********************************************************************/
1634 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1636 size_t c_len; /* Request lenght when treated as C string */
1638 c_len = strlen(buf);
1643 * Null byte(s) found. Log the request,
1644 * return an error response and hang up.
1646 size_t tmp_len = c_len;
1651 * Replace NULL byte(s) with '°' characters
1652 * so the request can be logged as string.
1653 * XXX: Is there a better replacement character?
1656 tmp_len += strlen(buf+tmp_len);
1657 } while (tmp_len < len);
1659 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1660 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1661 log_error(LOG_LEVEL_HEADER,
1662 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1664 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1666 /* XXX: Log correct size */
1667 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1677 /*********************************************************************
1679 * Function : crunch_response_triggered
1681 * Description : Checks if the request has to be crunched,
1682 * and delivers the crunch response if necessary.
1685 * 1 : csp = Current client state (buffers, headers, etc...)
1686 * 2 : crunchers = list of cruncher functions to run
1688 * Returns : TRUE if the request was answered with a crunch response
1691 *********************************************************************/
1692 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1694 struct http_response *rsp = NULL;
1695 const struct cruncher *c;
1698 * If CGI request crunching is disabled,
1699 * check the CGI dispatcher out of order to
1700 * prevent unintentional blocks or redirects.
1702 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1703 && (NULL != (rsp = dispatch_cgi(csp))))
1705 /* Deliver, log and free the interception response. */
1706 send_crunch_response(csp, rsp);
1710 for (c = crunchers; c->cruncher != NULL; c++)
1713 * Check the cruncher if either Privoxy is toggled
1714 * on and the request isn't forced, or if the cruncher
1715 * applies to forced requests as well.
1717 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1718 !(csp->flags & CSP_FLAG_FORCED)) ||
1719 (c->flags & CF_IGNORE_FORCE))
1721 rsp = c->cruncher(csp);
1724 /* Deliver, log and free the interception response. */
1725 send_crunch_response(csp, rsp);
1726 #ifdef FEATURE_STATISTICS
1727 if (c->flags & CF_COUNT_AS_REJECT)
1729 csp->flags |= CSP_FLAG_REJECTED;
1731 #endif /* def FEATURE_STATISTICS */
1742 /*********************************************************************
1744 * Function : build_request_line
1746 * Description : Builds the HTTP request line.
1748 * If a HTTP forwarder is used it expects the whole URL,
1749 * web servers only get the path.
1752 * 1 : csp = Current client state (buffers, headers, etc...)
1753 * 2 : fwd = The forwarding spec used for the request
1754 * XXX: Should use http->fwd instead.
1755 * 3 : request_line = The old request line which will be replaced.
1757 * Returns : Nothing. Terminates in case of memory problems.
1759 *********************************************************************/
1760 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1762 struct http_request *http = csp->http;
1764 assert(http->ssl == 0);
1767 * Downgrade http version from 1.1 to 1.0
1768 * if +downgrade action applies.
1770 if ( (csp->action->flags & ACTION_DOWNGRADE)
1771 && (!strcmpic(http->ver, "HTTP/1.1")))
1774 http->ver = strdup("HTTP/1.0");
1776 if (http->ver == NULL)
1778 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1783 * Rebuild the request line.
1785 freez(*request_line);
1786 *request_line = strdup(http->gpc);
1787 string_append(request_line, " ");
1789 if (fwd->forward_host)
1791 string_append(request_line, http->url);
1795 string_append(request_line, http->path);
1797 string_append(request_line, " ");
1798 string_append(request_line, http->ver);
1800 if (*request_line == NULL)
1802 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1804 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1808 /*********************************************************************
1810 * Function : change_request_destination
1812 * Description : Parse a (rewritten) request line and regenerate
1813 * the http request data.
1816 * 1 : csp = Current client state (buffers, headers, etc...)
1818 * Returns : Forwards the parse_http_request() return code.
1819 * Terminates in case of memory problems.
1821 *********************************************************************/
1822 static jb_err change_request_destination(struct client_state *csp)
1824 struct http_request *http = csp->http;
1827 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1828 free_http_request(http);
1829 err = parse_http_request(csp->headers->first->str, http, csp);
1830 if (JB_ERR_OK != err)
1832 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1833 jb_err_to_string(err));
1835 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1836 if (http->ocmd == NULL)
1838 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1845 /*********************************************************************
1849 * Description : Once a connection to the client has been accepted,
1850 * this function is called (via serve()) to handle the
1851 * main business of the communication. When this
1852 * function returns, the caller must close the client
1855 * FIXME: chat is nearly thousand lines long.
1859 * 1 : csp = Current client state (buffers, headers, etc...)
1861 * Returns : Nothing.
1863 *********************************************************************/
1864 static void chat(struct client_state *csp)
1866 char buf[BUFFER_SIZE];
1874 int ms_iis5_hack = 0;
1875 size_t byte_count = 0;
1876 int forwarded_connect_retries = 0;
1877 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1878 const struct forward_spec * fwd;
1879 struct http_request *http;
1880 int len; /* for buffer sizes (and negative error codes) */
1882 #ifdef FEATURE_KILL_POPUPS
1883 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1884 #endif /* def FEATURE_KILL_POPUPS */
1886 /* Function that does the content filtering for the current request */
1887 filter_function_ptr content_filter = NULL;
1889 /* Skeleton for HTTP response, if we should intercept the request */
1890 struct http_response *rsp;
1892 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1893 struct list header_list;
1894 struct list *headers = &header_list;
1898 memset(buf, 0, sizeof(buf));
1901 * Read the client's request. Note that since we're not using select() we
1902 * could get blocked here if a client connected, then didn't say anything!
1907 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1909 if (len <= 0) break; /* error! */
1912 * If there is no memory left for buffering the
1913 * request, there is nothing we can do but hang up
1915 if (add_to_iob(csp, buf, len))
1920 req = get_header(csp);
1922 } while ((NULL != req) && ('\0' == *req));
1924 if ((NULL != req) && ('\0' != *req))
1926 /* Request received. Validate and parse it. */
1930 * XXX: Temporary disabled to prevent problems
1931 * with POST requests whose bodies are allowed to
1932 * contain NULL bytes. BR#1730105.
1934 * The main purpose of this check is to properly
1935 * log stuff like BitTorrent traffic and other junk
1936 * that hits public proxies. It's not required for
1937 * Privoxy to functions as those requests are discarded
1940 * It probably should be rewritten to only check
1941 * the head of the request. Another option would
1942 * be to let all POST requests pass, although that
1943 * may not be good enough.
1945 if (request_contains_null_bytes(csp, buf, len))
1947 /* NULL bytes found and dealt with, just hang up. */
1952 /* Does the request line look invalid? */
1953 if (client_protocol_is_unsupported(csp, req))
1956 * Yes. The request has already been
1957 * answered with a error response, the buffers
1958 * were freed and we're done with chatting.
1963 #ifdef FEATURE_FORCE_LOAD
1965 * If this request contains the FORCE_PREFIX and blocks
1966 * aren't enforced, get rid of it and set the force flag.
1968 if (strstr(req, FORCE_PREFIX))
1970 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1972 log_error(LOG_LEVEL_FORCE,
1973 "Ignored force prefix in request: \"%s\".", req);
1977 strclean(req, FORCE_PREFIX);
1978 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
1979 csp->flags |= CSP_FLAG_FORCED;
1983 #endif /* def FEATURE_FORCE_LOAD */
1984 err = parse_http_request(req, http, csp);
1985 if (JB_ERR_OK != err)
1987 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
1993 if (http->cmd == NULL)
1995 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1996 /* XXX: Use correct size */
1997 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1998 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2000 free_http_request(http);
2004 /* grab the rest of the client's headers */
2008 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2010 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2013 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2018 * If there is no memory left for buffering the
2019 * request, there is nothing we can do but hang up
2021 if (add_to_iob(csp, buf, len))
2028 if (p == NULL) break;
2035 if (http->host == NULL)
2038 * If we still don't know the request destination,
2039 * the request is invalid or the client uses
2040 * Privoxy without its knowledge.
2042 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2045 * Our attempts to get the request destination
2046 * elsewhere failed or Privoxy is configured
2047 * to only accept proxy requests.
2049 * An error response has already been send
2050 * and we're done here.
2057 * Determine the actions for this URL
2059 #ifdef FEATURE_TOGGLE
2060 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2062 /* Most compatible set of actions (i.e. none) */
2063 init_current_action(csp->action);
2066 #endif /* ndef FEATURE_TOGGLE */
2068 url_actions(http, csp);
2072 * Save a copy of the original request for logging
2074 http->ocmd = strdup(http->cmd);
2076 if (http->ocmd == NULL)
2078 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2081 enlist(csp->headers, http->cmd);
2083 /* Append the previously read headers */
2084 list_append_list_unique(csp->headers, headers);
2085 destroy_list(headers);
2087 err = sed(client_patterns, add_client_headers, csp);
2088 if (JB_ERR_OK != err)
2090 assert(err == JB_ERR_PARSE);
2091 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2093 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2095 /* Check request line for rewrites. */
2096 if ((NULL == csp->headers->first->str)
2097 || (strcmp(http->cmd, csp->headers->first->str) &&
2098 (JB_ERR_OK != change_request_destination(csp))))
2101 * A header filter broke the request line - bail out.
2103 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2104 /* XXX: Use correct size */
2105 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2106 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2108 free_http_request(http);
2112 /* decide how to route the HTTP request */
2113 if (NULL == (fwd = forward_url(http, csp)))
2115 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2116 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2120 * build the http request to send to the server
2121 * we have to do one of the following:
2123 * create = use the original HTTP request to create a new
2124 * HTTP request that has either the path component
2125 * without the http://domainspec (w/path) or the
2126 * full orininal URL (w/url)
2127 * Note that the path and/or the HTTP version may
2128 * have been altered by now.
2130 * connect = Open a socket to the host:port of the server
2131 * and short-circuit server and client socket.
2133 * pass = Pass the request unchanged if forwarding a CONNECT
2134 * request to a parent proxy. Note that we'll be sending
2135 * the CFAIL message ourselves if connecting to the parent
2136 * fails, but we won't send a CSUCCEED message if it works,
2137 * since that would result in a double message (ours and the
2138 * parent's). After sending the request to the parent, we simply
2141 * here's the matrix:
2144 * +--------+--------+
2146 * 0 | create | connect|
2148 * Forwarding +--------+--------+
2150 * 1 | create | pass |
2152 * +--------+--------+
2157 * Check if a CONNECT request is allowable:
2158 * In the absence of a +limit-connect action, allow only port 443.
2159 * If there is an action, allow whatever matches the specificaton.
2163 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
2164 || (csp->action->flags & ACTION_LIMIT_CONNECT
2165 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
2167 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2170 * The response may confuse some clients,
2171 * but makes unblocking easier.
2173 * XXX: It seems to work with all major browsers,
2174 * so we should consider returning a body by default someday ...
2176 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2177 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2178 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2180 csp->action->flags |= ACTION_BLOCK;
2185 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2186 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2187 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2188 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2190 assert(NULL != csp->http->ocmd);
2191 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2193 list_remove_all(csp->headers);
2195 * XXX: For consistency we might want to log a crunch message here.
2204 freez(csp->headers->first->str);
2205 build_request_line(csp, fwd, &csp->headers->first->str);
2208 hdr = list_to_text(csp->headers);
2211 /* FIXME Should handle error properly */
2212 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2216 * We have a request. Check if one of the crunchers wants it.
2218 if (crunch_response_triggered(csp, crunchers_all))
2221 * Yes. The client got the crunch response
2222 * and we are done here after cleaning up.
2225 list_remove_all(csp->headers);
2231 * The headers can't be removed earlier because
2232 * they were still needed for the referrer check
2233 * in case of CGI crunches.
2235 * XXX: Would it be worth to move the referrer check
2236 * into client_referrer() and set a flag if it's trusted?
2238 list_remove_all(csp->headers);
2240 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2242 if (fwd->forward_host)
2244 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2245 fwd->forward_host, fwd->forward_port, http->hostport);
2249 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2252 /* here we connect to the server, gateway, or the forwarder */
2254 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2255 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2257 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2258 forwarded_connect_retries, http->hostport);
2261 if (csp->sfd == JB_INVALID_SOCKET)
2263 if (fwd->type != SOCKS_NONE)
2266 rsp = error_response(csp, "forwarding-failed", errno);
2268 else if (errno == EINVAL)
2270 rsp = error_response(csp, "no-such-domain", errno);
2274 rsp = error_response(csp, "connect-failed", errno);
2275 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2280 /* Write the answer to the client */
2283 send_crunch_response(csp, rsp);
2290 if (fwd->forward_host || (http->ssl == 0))
2292 /* write the client's (modified) header to the server
2293 * (along with anything else that may be in the buffer)
2296 if (write_socket(csp->sfd, hdr, strlen(hdr))
2297 || (flush_socket(csp->sfd, csp) < 0))
2299 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2302 rsp = error_response(csp, "connect-failed", errno);
2306 send_crunch_response(csp, rsp);
2316 * We're running an SSL tunnel and we're not forwarding,
2317 * so just send the "connect succeeded" message to the
2318 * client, flush the rest, and get out of the way.
2320 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2328 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2330 /* we're finished with the client's header */
2333 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2335 /* pass data between the client and server
2336 * until one or the other shuts down the connection.
2345 * FD_ZERO here seems to point to an errant macro which crashes.
2346 * So do this by hand for now...
2348 memset(&rfds,0x00,sizeof(fd_set));
2352 FD_SET(csp->cfd, &rfds);
2353 FD_SET(csp->sfd, &rfds);
2355 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2359 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2363 /* this is the body of the browser's request
2364 * just read it and write it.
2367 if (FD_ISSET(csp->cfd, &rfds))
2369 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2373 break; /* "game over, man" */
2376 if (write_socket(csp->sfd, buf, (size_t)len))
2378 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2385 * The server wants to talk. It could be the header or the body.
2386 * If `hdr' is null, then it's the header otherwise it's the body.
2387 * FIXME: Does `hdr' really mean `host'? No.
2391 if (FD_ISSET(csp->sfd, &rfds))
2394 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2398 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2400 if (http->ssl && (fwd->forward_host == NULL))
2403 * Just hang up. We already confirmed the client's CONNECT
2404 * request with status code 200 and unencrypted content is
2405 * no longer welcome.
2407 log_error(LOG_LEVEL_ERROR,
2408 "CONNECT already confirmed. Unable to tell the client about the problem.");
2411 else if (byte_count)
2414 * Just hang up. We already transmitted the original headers
2415 * and parts of the original content and therefore missed the
2416 * chance to send an error message (without risking data corruption).
2418 * XXX: we could retry with a fancy range request here.
2420 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2421 "Unable to tell the client about the problem.");
2425 rsp = error_response(csp, "connect-failed", errno);
2429 send_crunch_response(csp, rsp);
2435 /* Add a trailing zero. This lets filter_popups
2436 * use string operations.
2440 #ifdef FEATURE_KILL_POPUPS
2441 /* Filter the popups on this read. */
2442 if (block_popups_now)
2444 filter_popups(buf, csp);
2446 #endif /* def FEATURE_KILL_POPUPS */
2448 /* Normally, this would indicate that we've read
2449 * as much as the server has sent us and we can
2450 * close the client connection. However, Microsoft
2451 * in its wisdom has released IIS/5 with a bug that
2452 * prevents it from sending the trailing \r\n in
2453 * a 302 redirect header (and possibly other headers).
2454 * To work around this if we've haven't parsed
2455 * a full header we'll append a trailing \r\n
2456 * and see if this now generates a valid one.
2458 * This hack shouldn't have any impacts. If we've
2459 * already transmitted the header or if this is a
2460 * SSL connection, then we won't bother with this
2461 * hack. So we only work on partially received
2462 * headers. If we append a \r\n and this still
2463 * doesn't generate a valid header, then we won't
2464 * transmit anything to the client.
2469 if (server_body || http->ssl)
2472 * If we have been buffering up the document,
2473 * now is the time to apply content modification
2474 * and send the result to the client.
2478 p = execute_content_filter(csp, content_filter);
2480 * If the content filter fails, use the original
2481 * buffer and length.
2482 * (see p != NULL ? p : csp->iob->cur below)
2486 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2489 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2491 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2494 hdr = list_to_text(csp->headers);
2497 /* FIXME Should handle error properly */
2498 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2502 * Shouldn't happen because this was the second sed run
2503 * and tags are only created for the first one.
2505 assert(!crunch_response_triggered(csp, crunchers_all));
2507 if (write_socket(csp->cfd, hdr, strlen(hdr))
2508 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2510 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2520 break; /* "game over, man" */
2524 * This is NOT the body, so
2525 * Let's pretend the server just sent us a blank line.
2527 log_error(LOG_LEVEL_INFO,
2528 "Malformerd HTTP headers detected and MS IIS5 hack enabled. "
2529 "Expect an invalid response or even no response at all.");
2530 snprintf(buf, sizeof(buf), "\r\n");
2531 len = (int)strlen(buf);
2534 * Now, let the normal header parsing algorithm below do its
2535 * job. If it fails, we'll exit instead of continuing.
2542 * If this is an SSL connection or we're in the body
2543 * of the server document, just write it to the client,
2544 * unless we need to buffer the body for later content-filtering
2547 if (server_body || http->ssl)
2552 * If there is no memory left for buffering the content, or the buffer limit
2553 * has been reached, switch to non-filtering mode, i.e. make & write the
2554 * header, flush the iob and buf, and get out of the way.
2556 if (add_to_iob(csp, buf, len))
2561 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2563 hdr = list_to_text(csp->headers);
2567 * Memory is too tight to even generate the header.
2568 * Send our static "Out-of-memory" page.
2570 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2571 rsp = cgi_error_memory();
2572 send_crunch_response(csp, rsp);
2576 hdrlen = strlen(hdr);
2578 if (write_socket(csp->cfd, hdr, hdrlen)
2579 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2580 || (write_socket(csp->cfd, buf, (size_t)len)))
2582 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2589 * Reset the byte_count to the amount of bytes
2590 * we just flushed. len will be added a few lines below,
2591 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2593 byte_count = (size_t)flushed;
2595 content_filter = NULL;
2601 if (write_socket(csp->cfd, buf, (size_t)len))
2603 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2607 byte_count += (size_t)len;
2612 /* we're still looking for the end of the
2613 * server's header ... (does that make header
2614 * parsing an "out of body experience" ?
2618 * buffer up the data we just read. If that fails,
2619 * there's little we can do but send our static
2620 * out-of-memory page.
2622 if (add_to_iob(csp, buf, len))
2624 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2625 rsp = cgi_error_memory();
2626 send_crunch_response(csp, rsp);
2631 /* Convert iob into something sed() can digest */
2632 if (JB_ERR_PARSE == get_server_headers(csp))
2636 /* Well, we tried our MS IIS/5
2637 * hack and it didn't work.
2638 * The header is incomplete
2639 * and there isn't anything
2640 * we can do about it.
2646 /* Since we have to wait for
2647 * more from the server before
2648 * we can parse the headers
2649 * we just continue here.
2655 /* Did we actually get anything? */
2656 if (NULL == csp->headers->first)
2658 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2659 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2660 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2661 free_http_request(http);
2665 /* we have now received the entire header.
2666 * filter it and send the result to the client
2668 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2670 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2672 hdr = list_to_text(csp->headers);
2675 /* FIXME Should handle error properly */
2676 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2679 if (crunch_response_triggered(csp, crunchers_light))
2682 * One of the tags created by a server-header
2683 * tagger triggered a crunch. We already
2684 * delivered the crunch response to the client
2685 * and are done here after cleaning up.
2690 /* Buffer and pcrs filter this if appropriate. */
2692 if (!http->ssl) /* We talk plaintext */
2695 #ifdef FEATURE_KILL_POPUPS
2696 /* Start blocking popups if appropriate. */
2697 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2698 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2700 block_popups_now = 1;
2702 * Filter the part of the body that came in the same read
2703 * as the last headers:
2705 filter_popups(csp->iob->cur, csp);
2707 #endif /* def FEATURE_KILL_POPUPS */
2708 content_filter = get_filter_function(csp);
2711 * Only write if we're not buffering for content modification
2713 if (!content_filter)
2715 /* write the server's (modified) header to
2716 * the client (along with anything else that
2717 * may be in the buffer)
2720 if (write_socket(csp->cfd, hdr, strlen(hdr))
2721 || ((len = flush_socket(csp->cfd, csp)) < 0))
2723 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2725 /* the write failed, so don't bother
2726 * mentioning it to the client...
2727 * it probably can't hear us anyway.
2733 byte_count += (size_t)len;
2736 /* we're finished with the server's header */
2741 /* If this was a MS IIS/5 hack then it means
2742 * the server has already closed the
2743 * connection. Nothing more to read. Time
2754 return; /* huh? we should never get here */
2757 if (csp->content_length == 0)
2760 * If Privoxy didn't recalculate the
2761 * Content-Lenght, byte_count is still
2764 csp->content_length = byte_count;
2767 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2768 csp->ip_addr_str, http->ocmd, csp->content_length);
2772 /*********************************************************************
2776 * Description : This is little more than chat. We only "serve" to
2777 * to close any socket that chat may have opened.
2780 * 1 : csp = Current client state (buffers, headers, etc...)
2784 *********************************************************************/
2786 void serve(struct client_state *csp)
2787 #else /* ifndef AMIGA */
2788 static void serve(struct client_state *csp)
2789 #endif /* def AMIGA */
2792 close_socket(csp->cfd);
2794 if (csp->sfd != JB_INVALID_SOCKET)
2796 close_socket(csp->sfd);
2799 csp->flags &= ~CSP_FLAG_ACTIVE;
2805 /*********************************************************************
2807 * Function : server_thread
2809 * Description : We only exist to call `serve' in a threaded environment.
2812 * 1 : data = Current client state (buffers, headers, etc...)
2814 * Returns : Always 0.
2816 *********************************************************************/
2817 static int32 server_thread(void *data)
2819 serve((struct client_state *) data);
2827 /*********************************************************************
2831 * Description : Print usage info & exit.
2833 * Parameters : Pointer to argv[0] for identifying ourselves
2837 *********************************************************************/
2838 static void usage(const char *myname)
2840 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2844 #endif /* defined(unix) */
2847 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2848 #endif /* defined(unix) */
2849 "[--version] [configfile]\n"
2850 "Aborting\n", myname);
2855 #endif /* defined(unix) */
2858 /*********************************************************************
2860 * Function : initialize_mutexes
2862 * Description : Prepares mutexes if mutex support is available.
2866 * Returns : Void, exits in case of errors.
2868 *********************************************************************/
2869 static void initialize_mutexes(void)
2873 #ifdef FEATURE_PTHREAD
2875 * Prepare global mutex semaphores
2877 err = pthread_mutex_init(&log_mutex, 0);
2879 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2882 * XXX: The assumptions below are a bit naive
2883 * and can cause locks that aren't necessary.
2885 * For example older FreeBSD versions (< 6.x?)
2886 * have no gethostbyname_r, but gethostbyname is
2889 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2890 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2891 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2893 * XXX: should we use a single mutex for
2894 * localtime() and gmtime() as well?
2896 #ifndef HAVE_GMTIME_R
2897 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2898 #endif /* ndef HAVE_GMTIME_R */
2900 #ifndef HAVE_LOCALTIME_R
2901 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2902 #endif /* ndef HAVE_GMTIME_R */
2905 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2906 #endif /* ndef HAVE_RANDOM */
2907 #endif /* FEATURE_PTHREAD */
2910 * TODO: mutex support for mingw32 would be swell.
2915 printf("Fatal error. Mutex initialization failed: %s.\n",
2924 /*********************************************************************
2928 * Description : Load the config file and start the listen loop.
2929 * This function is a lot more *sane* with the `load_config'
2930 * and `listen_loop' functions; although it stills does
2931 * a *little* too much for my taste.
2934 * 1 : argc = Number of parameters (including $0).
2935 * 2 : argv = Array of (char *)'s to the parameters.
2937 * Returns : 1 if : can't open config file, unrecognized directive,
2938 * stats requested in multi-thread mode, can't open the
2939 * log file, can't open the jar file, listen port is invalid,
2940 * any load fails, and can't bind port.
2942 * Else main never returns, the process must be signaled
2943 * to terminate execution. Or, on Windows, use the
2944 * "File", "Exit" menu option.
2946 *********************************************************************/
2948 int real_main(int argc, const char *argv[])
2950 int main(int argc, const char *argv[])
2954 unsigned int random_seed;
2956 struct passwd *pw = NULL;
2957 struct group *grp = NULL;
2960 char *pre_chroot_nslookup_to_load_resolver = NULL;
2967 #if !defined(_WIN32)
2975 * Parse the command line arguments
2977 * XXX: simply printing usage information in case of
2978 * invalid arguments isn't particular user friendly.
2980 while (++argc_pos < argc)
2983 /* Check to see if the service must be installed or uninstalled */
2984 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2986 const char *pName = argv[argc_pos] + 9;
2989 exit( (install_service(pName)) ? 0 : 1 );
2991 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
2993 const char *pName = argv[argc_pos] + 11;
2996 exit((uninstall_service(pName)) ? 0 : 1);
2998 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3000 bRunAsService = TRUE;
3001 w32_set_service_cwd();
3002 atexit(w32_service_exit_notify);
3005 #endif /* defined(_WIN32) */
3008 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3010 if (strcmp(argv[argc_pos], "--help") == 0)
3015 else if(strcmp(argv[argc_pos], "--version") == 0)
3017 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3023 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3028 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3030 if (++argc_pos == argc) usage(argv[0]);
3031 pidfile = strdup(argv[argc_pos]);
3034 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3036 if (++argc_pos == argc) usage(argv[argc_pos]);
3038 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3041 if (NULL == (grp = getgrnam(p)))
3043 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3047 if (NULL == (pw = getpwnam(argv[argc_pos])))
3049 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3052 if (p != NULL) *--p = '\0';
3055 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3057 if (++argc_pos == argc) usage(argv[0]);
3058 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3061 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3065 #endif /* defined(unix) */
3067 else if (argc_pos + 1 != argc)
3070 * This is neither the last command line
3071 * option, nor was it recognized before,
3072 * therefore it must be invalid.
3078 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3080 configfile = argv[argc_pos];
3083 } /* -END- while (more arguments) */
3086 if ( *configfile != '/' )
3088 char cwd[BUFFER_SIZE];
3090 size_t abs_file_size;
3092 /* make config-filename absolute here */
3093 if (NULL == getcwd(cwd, sizeof(cwd)))
3095 perror("failed to get current working directory");
3100 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3101 basedir = strdup(cwd);
3103 if (NULL == basedir ||
3104 NULL == (abs_file = malloc(abs_file_size)))
3106 perror("malloc failed");
3109 strlcpy(abs_file, basedir, abs_file_size);
3110 strlcat(abs_file, "/", abs_file_size );
3111 strlcat(abs_file, configfile, abs_file_size);
3112 configfile = abs_file;
3114 #endif /* defined unix */
3118 clients->next = NULL;
3120 /* XXX: factor out initialising after the next stable release. */
3123 #elif defined(_WIN32)
3127 /* Prepare mutexes if supported and necessary. */
3128 initialize_mutexes();
3130 /* Enable logging until further notice. */
3131 init_log_module(Argv[0]);
3133 random_seed = (unsigned int)time(NULL);
3135 srandom(random_seed);
3136 #elif defined (_WIN32)
3138 * See pick_from_range() in miscutil.c for details.
3140 log_error(LOG_LEVEL_INFO,
3141 "No thread-safe PRNG implemented for your platform. "
3142 "Using weak \'randomization\' factor which will "
3143 "limit the already questionable usefulness of "
3144 "header-time-randomizing actions (disabled by default).");
3147 #endif /* ifdef HAVE_RANDOM */
3150 * Unix signal handling
3152 * Catch the abort, interrupt and terminate signals for a graceful exit
3153 * Catch the hangup signal so the errlog can be reopened.
3154 * Ignore the broken pipe signals (FIXME: Why?)
3156 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3159 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3160 const int ignored_signals[] = { SIGPIPE, 0 };
3162 for (idx = 0; catched_signals[idx] != 0; idx++)
3164 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3165 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3167 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3168 #endif /* ifdef sun */
3170 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3174 for (idx = 0; ignored_signals[idx] != 0; idx++)
3176 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3178 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3183 #else /* ifdef _WIN32 */
3184 # ifdef _WIN_CONSOLE
3186 * We *are* in a windows console app.
3187 * Print a verbose messages about FAQ's and such
3189 printf("%s", win32_blurb);
3190 # endif /* def _WIN_CONSOLE */
3191 #endif /* def _WIN32 */
3194 /* Initialize the CGI subsystem */
3195 cgi_init_error_messages();
3198 * If runnig on unix and without the --nodaemon
3199 * option, become a daemon. I.e. fork, detach
3200 * from tty and get process group leadership
3213 if ( pid < 0 ) /* error */
3218 else if ( pid != 0 ) /* parent */
3223 * must check for errors
3224 * child died due to missing files aso
3227 wpid = waitpid( pid, &status, WNOHANG );
3236 /* Should be more portable, but not as well tested */
3241 #else /* ndef __FreeBSD__ */
3243 #endif /* ndef __FreeBSD__ */
3244 fd = open("/dev/tty", O_RDONLY);
3247 /* no error check here */
3248 ioctl( fd, TIOCNOTTY,0 );
3253 * stderr (fd 2) will be closed later on, when the
3254 * log file has been parsed.
3261 } /* -END- if (!no_daemon) */
3264 * As soon as we have written the PID file, we can switch
3265 * to the user and group ID indicated by the --user option
3271 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3273 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3279 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3281 /* Read the time zone file from /etc before doing chroot. */
3283 if (NULL != pre_chroot_nslookup_to_load_resolver
3284 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3286 /* Initialize resolver library. */
3287 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3289 if (chroot(pw->pw_dir) < 0)
3291 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3295 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3298 if (setuid(pw->pw_uid))
3300 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3304 char putenv_dummy[64];
3306 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3307 if (putenv(putenv_dummy) != 0)
3309 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3312 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3313 if (putenv(putenv_dummy) != 0)
3315 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3321 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3324 #endif /* defined unix */
3327 /* This will be FALSE unless the command line specified --service
3331 /* Yup, so now we must attempt to establish a connection
3332 * with the service dispatcher. This will only work if this
3333 * process was launched by the service control manager to
3334 * actually run as a service. If this isn't the case, i've
3335 * known it take around 30 seconds or so for the call to return.
3338 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3339 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3341 /* Service has run, and at this point is now being stopped, so just return */
3346 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3348 /* An error occurred. Usually it's because --service was wrongly specified
3349 * and we were unable to connect to the Service Control Dispatcher because
3350 * it wasn't expecting us and is therefore not listening.
3352 * For now, just continue below to call the listen_loop function.
3355 #endif /* def _WIN32 */
3365 /*********************************************************************
3367 * Function : bind_port_helper
3369 * Description : Bind the listen port. Handles logging, and aborts
3373 * 1 : config = Privoxy configuration. Specifies port
3376 * Returns : Port that was opened.
3378 *********************************************************************/
3379 static jb_socket bind_port_helper(struct configuration_spec * config)
3384 if ( (config->haddr != NULL)
3385 && (config->haddr[0] == '1')
3386 && (config->haddr[1] == '2')
3387 && (config->haddr[2] == '7')
3388 && (config->haddr[3] == '.') )
3390 log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
3393 else if (config->haddr == NULL)
3395 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3400 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3401 config->hport, config->haddr);
3404 result = bind_port(config->haddr, config->hport, &bfd);
3411 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3412 "There may be another Privoxy or some other "
3413 "proxy running on port %d",
3414 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3415 config->hport, config->hport);
3418 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3419 "The hostname is not resolvable",
3420 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3423 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3424 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3427 /* shouldn't get here */
3428 return JB_INVALID_SOCKET;
3431 config->need_bind = 0;
3438 /* Without this simple workaround we get this compiler warning from _beginthread
3439 * warning C4028: formal parameter 1 different from declaration
3441 void w32_service_listen_loop(void *p)
3445 #endif /* def _WIN32 */
3448 /*********************************************************************
3450 * Function : listen_loop
3452 * Description : bind the listen port and enter a "FOREVER" listening loop.
3458 *********************************************************************/
3459 static void listen_loop(void)
3461 struct client_state *csp = NULL;
3463 struct configuration_spec * config;
3465 config = load_config();
3467 bfd = bind_port_helper(config);
3469 #ifdef FEATURE_GRACEFUL_TERMINATION
3470 while (!g_terminate)
3475 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3476 while (waitpid(-1, NULL, WNOHANG) > 0)
3478 /* zombie children */
3480 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3483 * Free data that was used by died threads
3489 * Re-open the errlog after HUP signal
3491 if (received_hup_signal)
3493 init_error_log(Argv[0], config->logfile);
3494 received_hup_signal = 0;
3499 #ifdef FEATURE_COOKIE_JAR
3501 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3502 * already open. I think unload_configfile() is not being run, which should do
3503 * this work. Until that can get resolved, we'll use this workaround.
3507 if (csp->config->jar)
3509 fclose(csp->config->jar);
3510 csp->config->jar = NULL;
3512 #endif /* FEATURE_COOKIE_JAR */
3513 #endif /* __OS2__ */
3515 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3517 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3521 csp->flags |= CSP_FLAG_ACTIVE;
3522 csp->sfd = JB_INVALID_SOCKET;
3524 csp->config = config = load_config();
3526 if ( config->need_bind )
3529 * Since we were listening to the "old port", we will not see
3530 * a "listen" param change until the next IJB request. So, at
3531 * least 1 more request must be made for us to find the new
3532 * setting. I am simply closing the old socket and binding the
3535 * Which-ever is correct, we will serve 1 more page via the
3536 * old settings. This should probably be a "show-proxy-args"
3537 * request. This should not be a so common of an operation
3538 * that this will hurt people's feelings.
3543 bfd = bind_port_helper(config);
3546 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3548 if (!accept_connection(csp, bfd))
3550 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3563 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3566 #ifdef FEATURE_TOGGLE
3567 if (global_toggle_state)
3569 csp->flags |= CSP_FLAG_TOGGLED_ON;
3571 #endif /* def FEATURE_TOGGLE */
3573 if (run_loader(csp))
3575 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3576 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3580 if (block_acl(NULL,csp))
3582 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3583 close_socket(csp->cfd);
3587 #endif /* def FEATURE_ACL */
3589 /* add it to the list of clients */
3590 csp->next = clients->next;
3591 clients->next = csp;
3593 if (config->multi_threaded)
3597 /* this is a switch () statment in the C preprocessor - ugh */
3598 #undef SELECTED_ONE_OPTION
3600 /* Use Pthreads in preference to native code */
3601 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3602 #define SELECTED_ONE_OPTION
3604 pthread_t the_thread;
3605 pthread_attr_t attrs;
3607 pthread_attr_init(&attrs);
3608 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3609 errno = pthread_create(&the_thread, &attrs,
3610 (void * (*)(void *))serve, csp);
3611 child_id = errno ? -1 : 0;
3612 pthread_attr_destroy(&attrs);
3616 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3617 #define SELECTED_ONE_OPTION
3618 child_id = _beginthread(
3619 (void (*)(void *))serve,
3624 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3625 #define SELECTED_ONE_OPTION
3626 child_id = _beginthread(
3627 (void(* _Optlink)(void*))serve,
3633 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3634 #define SELECTED_ONE_OPTION
3636 thread_id tid = spawn_thread
3637 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3639 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3641 child_id = (int) tid;
3650 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3651 #define SELECTED_ONE_OPTION
3652 csp->cfd = ReleaseSocket(csp->cfd, -1);
3655 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3656 NP_Output, Output(),
3657 NP_CloseOutput, FALSE,
3658 NP_Name, (ULONG)"privoxy child",
3662 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3663 NP_Output, Output(),
3664 NP_CloseOutput, FALSE,
3665 NP_Name, (ULONG)"privoxy child",
3666 NP_StackSize, 200*1024,
3672 ((struct Task *)child_id)->tc_UserData = csp;
3673 Signal((struct Task *)child_id, SIGF_SINGLE);
3678 #if !defined(SELECTED_ONE_OPTION)
3681 /* This block is only needed when using fork().
3682 * When using threads, the server thread was
3683 * created and run by the call to _beginthread().
3685 if (child_id == 0) /* child */
3688 #ifdef FEATURE_TOGGLE
3689 int inherited_toggle_state = global_toggle_state;
3690 #endif /* def FEATURE_TOGGLE */
3695 * If we've been toggled or we've blocked the request, tell Mom
3698 #ifdef FEATURE_TOGGLE
3699 if (inherited_toggle_state != global_toggle_state)
3701 rc |= RC_FLAG_TOGGLED;
3703 #endif /* def FEATURE_TOGGLE */
3705 #ifdef FEATURE_STATISTICS
3706 if (csp->flags & CSP_FLAG_REJECTED)
3708 rc |= RC_FLAG_BLOCKED;
3710 #endif /* ndef FEATURE_STATISTICS */
3714 else if (child_id > 0) /* parent */
3716 /* in a fork()'d environment, the parent's
3717 * copy of the client socket and the CSP
3721 #if !defined(_WIN32) && !defined(__CYGWIN__)
3723 wait( &child_status );
3726 * Evaluate child's return code: If the child has
3727 * - been toggled, toggle ourselves
3728 * - blocked its request, bump up the stats counter
3731 #ifdef FEATURE_TOGGLE
3732 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3734 global_toggle_state = !global_toggle_state;
3736 #endif /* def FEATURE_TOGGLE */
3738 #ifdef FEATURE_STATISTICS
3740 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3744 #endif /* def FEATURE_STATISTICS */
3746 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3747 close_socket(csp->cfd);
3748 csp->flags &= ~CSP_FLAG_ACTIVE;
3752 #undef SELECTED_ONE_OPTION
3753 /* end of cpp switch () */
3755 if (child_id < 0) /* failed */
3757 char buf[BUFFER_SIZE];
3759 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3761 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3763 write_socket(csp->cfd, buf, strlen(buf));
3764 close_socket(csp->cfd);
3765 csp->flags &= ~CSP_FLAG_ACTIVE;
3776 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3778 /* Clean up. Aim: free all memory (no leaks) */
3779 #ifdef FEATURE_GRACEFUL_TERMINATION
3781 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3783 unload_current_config_file();
3784 unload_current_actions_file();
3785 unload_current_re_filterfile();
3786 #ifdef FEATURE_TRUST
3787 unload_current_trust_file();
3790 if (config->multi_threaded)
3797 } while ((clients->next != NULL) && (--i > 0));
3801 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3812 #ifdef FEATURE_COOKIE_JAR
3813 if (NULL != config->jar)
3815 fclose(config->jar);
3819 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3820 /* Cleanup - remove taskbar icon etc. */
3825 #endif /* FEATURE_GRACEFUL_TERMINATION */