1 const char jcc_rcs[] = "$Id: jcc.c,v 1.157 2007/11/03 17:34:49 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 1.157 2007/11/03 17:34:49 fabiankeil
37 * Log the "weak randomization factor" warning only
38 * once for mingw32 and provide some more details.
40 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
41 * Initialize log module after initializing mutexes, future
42 * deadlocks in that code should now work cross-platform.
44 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
45 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
46 * Reported by Bert van Leeuwen in BR#1818808.
48 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
49 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
51 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
52 * When in daemon mode, close stderr after the configuration file has been
53 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
55 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
56 * - Fix a crash when parsing invalid requests whose first header
57 * is rejected by get_header(). Regression (re?)introduced
58 * in r1.143 by yours truly.
59 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
60 * client_cookie_adder() to make sure send-vanilla-wafer can be
61 * controlled through tags (and thus regression-tested).
63 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
64 * - Move get_filter_function() from jcc.c to filters.c
65 * so the filter functions can be static.
66 * - Don't bother filtering body-less responses.
68 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
69 * Execute content filters through execute_content_filter().
71 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
72 * Initialize req to NULL to make sure it's defined if the
73 * first read_socket() call fails. Reported by icmp30.
75 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
76 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
77 * extensive comments moved to user manual.
79 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
80 * Don't crash if a broken header filter wiped out the request line.
82 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
83 * Fix byte_count calculation in case of flushes
84 * and don't parse the server headers a second time.
86 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
87 * - If there's a connection problem after we already forwarded
88 * parts of the original content, just hang up. Fixes BR#1776724.
89 * - Fix warnings about unused code on mingw32.
90 * - In case of flushes, calculate the byte count
91 * less incorrectly (I think).
93 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
94 * Add some more prototypes for static functions.
96 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
97 * Comment out request_contains_null_bytes() until it's used again.
99 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
100 * #1763173 from Stefan Huehner: s@const static@static const@
101 * and declare some more functions static.
103 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
104 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
105 * and explain why they were rejected in the first place.
106 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
107 * CONNECT requests. The request line was missing.
108 * - Add two more XXX reminders as we don't have enough already.
110 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
111 * As Hal noticed, checking dispatch_cgi() as the last cruncher
112 * looks like a bug if CGI requests are blocked unintentionally,
113 * so don't do it unless the user enabled the new config option
114 * "allow-cgi-request-crunching".
116 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
117 * - Allow to rewrite the request destination behind the client's back.
118 * - Turn the weird-looking unconditional for loop that
119 * reads the client request into a conditional while loop.
120 * Move the stuff that only runs once out of the loop.
121 * - Move parts of chat(), server_content_type() and the
122 * necessary stuff to fix BR#1750917 into get_filter_function().
124 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
125 * Temporary workaround for BR#1730105.
127 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
128 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
129 * deadlocks and crashes on OpenBSD and possibly other OS with neither
130 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
131 * Thanks to Ralf Horstmann for report and solution.
133 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
134 * Add forward-override{} to change the forwarding settings through
135 * action sections. This is mainly interesting to forward different
136 * clients differently (for example based on User-Agent or request
139 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
140 * - Let usage() mention the --chroot parameter.
141 * - Use read_socket() consistently and always leave
142 * the last buffer byte alone, even in cases where
143 * null termination (currently) doesn't matter.
145 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
146 * - Fix config file loading on Unix if no config file is specified.
147 * Since r1.97 Privoxy would always interpret the last argument as
148 * config file, even if it's a valid command line option.
149 * - Abort in case of unrecognized command line options. Closes #1719696.
150 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
151 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
153 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
154 * - Don't rerun crunchers that only depend on the request URL.
155 * - Don't count redirects and CGI requests as "blocked requests".
157 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
158 * Support crunching based on tags created by server-header taggers.
160 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
161 * Make HTTP snippets static (again). Add a Content-Type for those
162 * with content so the browser doesn't guess it based on the URL.
164 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
165 * Move crunching and request line rebuilding out of chat().
167 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
168 * Introduce tags as alternative way to specify which
169 * actions apply to a request. At the moment tags can be
170 * created based on client and server headers.
172 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
173 * Don't CLF-log CONNECT requests twice.
175 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
176 * Log the source address for ACL-related connection drops.
178 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
179 * New config option: enforce-blocks.
181 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
182 * - Move null byte check into separate function.
183 * - Don't confuse the client with error pages
184 * if a CONNECT request was already confirmed.
186 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
187 * Speed up NULL byte escaping and only log the complete
188 * NULL byte requests with header debugging enabled.
190 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
191 * Answer requests that contain NULL bytes with
192 * a custom response instead of waiting for more
193 * data until the client eventually hangs up.
195 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
196 * - Move delivery and logging of crunched responses
197 * from chat() into send_crunch_response().
198 * - Display the reason for generating http_responses.
199 * - Log the content length for LOG_LEVEL_CLF correctly
200 * (still incorrect for some fixed responses).
201 * - Reword an incorrect comment about
202 * treat-forbidden-connects-like-blocks violating
204 * - Add some log messages.
206 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
207 * Move mutex initialization into separate
208 * function and exit in case of errors.
210 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
211 * - Start to reduce chat()'s line count and move
212 * parts of it into separate functions.
213 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
215 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
216 * - Add Proxy-Agent header to HTTP snippets that are
217 * supposed to reach HTTP clients only.
218 * - Made a few CONNECT log messages more descriptive.
219 * - Catch completely empty server responses (as seen
220 * with Tor's fake ".noconnect" top level domain).
221 * - Use shiny new "forwarding-failed" template for socks errors.
223 * Revision 1.118 2007/01/07 07:43:43 joergs
224 * AmigaOS4 support added.
226 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
227 * Added config option accept-intercepted-requests
228 * and disabled it by default.
230 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
231 * Reverted parts of my last commit
232 * to keep error handling working.
234 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
235 * Fixed gcc43 conversion warnings.
237 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
238 * Fix -pedantic ISO C warning about converting
239 * from function pointer to object pointer.
241 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
242 * Silence compiler warning I introduced with my last commit.
244 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
245 * Mutex protect rand() if POSIX threading
246 * is used, warn the user if that's not possible
247 * and stop using it on _WIN32 where it could
250 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
251 * Don't prevent core dumps by catching SIGABRT.
252 * It's rude and makes debugging unreasonable painful.
254 * Revision 1.110 2006/12/13 14:52:53 etresoft
255 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
257 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
258 * Privoxy is now able to run as intercepting
259 * proxy in combination with any packet filter
260 * that does the port redirection. The destination
261 * is extracted from the "Host:" header which
262 * should be available for nearly all requests.
264 * Moved HTTP snipplets into jcc.c.
265 * Added error message for gopher proxy requests.
267 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
268 * Only unlink the pidfile if it's actually used.
270 * Change order of interception checks to make
271 * it possible to block or redirect requests for
274 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
275 * Make pthread mutex locking more generic. Instead of
276 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
277 * and use mutex locking unless there is an _r function
278 * available. Better safe than sorry.
280 * Fixes "./configure --disable-pthread" and should result
281 * in less threading-related problems on pthread-using platforms,
282 * but it still doesn't fix BR#1122404.
284 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
285 * Move pthread.h inclusion from jcc.c to jcc.h.
286 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
288 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
289 * Don't exit after receiving the second SIGHUP on Solaris.
291 * Fixes BR 1052235, but the same problem may exist on other
292 * systems. Once 3.0.6 is out we should use sigset()
293 * where available and see if it breaks anything.
295 * Revision 1.104 2006/09/23 13:26:38 roro
296 * Replace TABs by spaces in source code.
298 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
299 * Fix +redirect{}. Didn't work with -fast-redirects.
301 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
302 * Respond with 400 and a short text message
303 * if the client tries to use Privoxy as FTP proxy.
305 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
306 * Make number of retries in case of forwarded-connect problems
307 * a config file option (forwarded-connect-retries) and use 0 as
310 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
311 * Set random(3) seed.
313 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
314 * Follow the OpenBSD port's lead and protect the resolve
315 * functions on OpenBSD as well.
317 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
318 * --user fix. Only use the user as group if no group is specified.
319 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
321 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
322 * Windows service (re-)integration
326 * --install[:service_name]
327 * --uninstall[:service_name]
330 * They work as follows:
331 * --install will create a service for you and then terminate.
332 * By default the service name will be "privoxy" (without the quotes).
333 * However you can run multiple services if you wish, just by adding
334 * a colon and then a name (no spaces).
336 * --uninstall follows the exact same rules a --install.
338 * --service is used when the program is executed by the service
339 * control manager, and in normal circumstances would never be
340 * used as a command line argument.
342 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
343 * Windows service integration
345 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
346 * Incorporate Fabian Keil's patch work:
347 http://www.fabiankeil.de/sourcecode/privoxy/
349 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
350 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
351 * with what was really the latest development (the v_3_0_branch branch)
353 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
354 * Thanks to Jindrich Makovicka for a race condition fix for the log
355 * file. The race condition remains for non-pthread implementations.
356 * Reference patch #1175720.
358 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
359 * Add the ability to check jpeg images for invalid
360 * lengths of comment blocks. Defensive strategy
361 * against the exploit:
362 * Microsoft Security Bulletin MS04-028
363 * Buffer Overrun in JPEG Processing (GDI+) Could
364 * Allow Code Execution (833987)
365 * Enabled with +inspect-jpegs in actions files.
367 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
368 * - Fixed usage info for non-unix platforms
369 * - Fixed small cmdline parsing bug
371 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
372 * Diagnostics: Now preserve the returncode of pthread_create
373 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
375 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
376 * No longer ignore SIGCHLD. Fixes bug #769381
378 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
379 * Close jarfile on graceful exit, remove stray line
381 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
382 * Cosmetics: Killed a warning, a typo and an allocation left at exit
384 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
385 * No longer rely on non-POSIX.1 extensions of getcwd().
388 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
389 * Replaced setenv() by posix-compliant putenv()
390 * Thanks to Neil McCalden (nmcc AT users.sf.net).
392 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
393 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
395 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
396 * Clean-up and extension of improvements for forked mode:
397 * - Child's return code now consists of flags RC_FLAG_*
398 * - Reporting toggle to parent now properly #ifdef'ed
399 * - Children now report blocking to parent. This enables
400 * statistics in forked mode
402 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
403 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
404 * Children now report having been toggled through _exit(17), parents
405 * watch for that code and toggle themselves if found.
407 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
408 * Wrapping all *_r functions (the non-_r versions of them) with
409 * mutex semaphores for OSX. Hopefully this will take care of all
410 * of those pesky crash reports.
412 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
413 * Fixed two mostly harmless mem leaks
415 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
416 * Fix: Head of global clients list now initialized to NULL
418 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
419 * Added basic support for OPTIONS and TRACE HTTP methods:
420 * - New interceptor direct_response() added in chat().
421 * - sed() moved to earlier in the process, so that the
422 * Host: header is evaluated before actions and forwarding
425 * Revision 1.92 2002/05/08 16:00:46 oes
426 * Chat's buffer handling:
427 * - Fixed bug with unchecked out-of-mem conditions
428 * while reading client request & server headers
429 * - No longer predict if the buffer limit will be exceeded
430 * in the next read -- check add_to_iob's new
431 * return code. If buffer couldn't be extended
432 * (policy or out-of-mem) while
433 * - reading from client: abort
434 * - reading server headers: send error page
435 * - buffering server body for filter: flush,
436 * and if that fails: send error page
438 * Revision 1.91 2002/04/08 20:35:58 swa
441 * Revision 1.90 2002/04/02 14:57:28 oes
442 * Made sending wafers independent of FEATURE_COOKIE_JAR
444 * Revision 1.89 2002/03/31 17:18:59 jongfoster
445 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
447 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
448 * More compiler warning message maintenance
450 * Revision 1.87 2002/03/26 22:29:54 swa
451 * we have a new homepage!
453 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
454 * Workaround for closing the jarfile before load_config() comes around again
456 * Revision 1.85 2002/03/24 15:23:33 jongfoster
459 * Revision 1.84 2002/03/24 13:25:43 swa
460 * name change related issues
462 * Revision 1.83 2002/03/16 23:54:06 jongfoster
463 * Adding graceful termination feature, to help look for memory leaks.
464 * If you enable this (which, by design, has to be done by hand
465 * editing config.h) and then go to http://i.j.b/die, then the program
466 * will exit cleanly after the *next* request. It should free all the
467 * memory that was used.
469 * Revision 1.82 2002/03/13 00:27:05 jongfoster
472 * Revision 1.81 2002/03/12 01:42:50 oes
473 * Introduced modular filters
475 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
476 * OS/2 port maintenance:
477 * - Fixed EMX build - it had decayed a little
478 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
479 * substituted a memset for now.
481 * Revision 1.79 2002/03/09 20:03:52 jongfoster
482 * - Making various functions return int rather than size_t.
483 * (Undoing a recent change). Since size_t is unsigned on
484 * Windows, functions like read_socket that return -1 on
485 * error cannot return a size_t.
487 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
488 * crashes, and also frequently caused JB to jump to 100%
489 * CPU and stay there. (Because it thought it had just
490 * read ((unsigned)-1) == 4Gb of data...)
492 * - The signature of write_socket has changed, it now simply
493 * returns success=0/failure=nonzero.
495 * - Trying to get rid of a few warnings --with-debug on
496 * Windows, I've introduced a new type "jb_socket". This is
497 * used for the socket file descriptors. On Windows, this
498 * is SOCKET (a typedef for unsigned). Everywhere else, it's
499 * an int. The error value can't be -1 any more, so it's
500 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
501 * Windows it maps to the #define INVALID_SOCKET.)
503 * - The signature of bind_port has changed.
505 * Revision 1.78 2002/03/08 21:35:04 oes
506 * Added optional group supplement to --user option. Will now use default group of user if no group given
508 * Revision 1.77 2002/03/07 03:52:06 oes
509 * - Fixed compiler warnings etc
510 * - Improved handling of failed DNS lookups
512 * Revision 1.76 2002/03/06 22:54:35 jongfoster
513 * Automated function-comment nitpicking.
515 * Revision 1.75 2002/03/06 10:02:19 oes
516 * Fixed stupid bug when --user was not given
518 * Revision 1.74 2002/03/06 00:49:31 jongfoster
519 * Fixing warning on Windows
520 * Making #ifdefs that refer to the same variable consistently
521 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
523 * Revision 1.73 2002/03/05 23:57:30 hal9
524 * Stray character 's' on line 1618 was breaking build.
526 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
527 * - Re-enable OS/2 building after new parms were added
528 * - Fix false out of memory report when resolving CGI templates when no IP
529 * address is available of failed attempt (a la no such domain)
531 * Revision 1.71 2002/03/05 18:13:56 oes
532 * Added --user option
534 * Revision 1.70 2002/03/05 04:52:42 oes
535 * Deleted non-errlog debugging code
537 * Revision 1.69 2002/03/04 23:50:00 jongfoster
538 * Splitting off bind_port() call into bind_port_helper(), with
541 * Revision 1.68 2002/03/04 20:17:32 oes
544 * Revision 1.67 2002/03/04 18:18:57 oes
545 * - Removed _DEBUG mode
546 * - Cleand up cmdline parsing
547 * - Introduced --no-daemon, --pidfile options
548 * - Cleaned up signal handling:
549 * - Terminate cleanly on INT, TERM and ABRT
550 * - Schedule logfile for re-opening on HUP
551 * - Ignore CHLD and PIPE
552 * - Leave the rest with their default handlers
553 * - Uniform handler registration
554 * - Added usage() function
555 * - Played styleguide police
557 * Revision 1.66 2002/03/03 15:06:55 oes
558 * Re-enabled automatic config reloading
560 * Revision 1.65 2002/03/03 14:49:11 oes
561 * Fixed CLF logging: Now uses client's original HTTP request
563 * Revision 1.64 2002/03/03 09:18:03 joergs
564 * Made jumbjuster work on AmigaOS again.
566 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
567 * Clean up a little CRLF unpleasantness that suddenly appeared
569 * Revision 1.62 2002/02/20 23:17:23 jongfoster
570 * Detecting some out-of memory conditions and exiting with a log message.
572 * Revision 1.61 2002/01/17 21:01:52 jongfoster
573 * Moving all our URL and URL pattern parsing code to urlmatch.c.
575 * Revision 1.60 2001/12/30 14:07:32 steudten
576 * - Add signal handling (unix)
577 * - Add SIGHUP handler (unix)
578 * - Add creation of pidfile (unix)
579 * - Add action 'top' in rc file (RH)
580 * - Add entry 'SIGNALS' to manpage
581 * - Add exit message to logfile (unix)
583 * Revision 1.59 2001/12/13 14:07:18 oes
584 * Fixed Bug: 503 error page now sent OK
586 * Revision 1.58 2001/11/30 23:37:24 jongfoster
587 * Renaming the Win32 config file to config.txt - this is almost the
588 * same as the corresponding UNIX name "config"
590 * Revision 1.57 2001/11/16 00:47:43 jongfoster
591 * Changing the tty-disconnection code to use setsid().
593 * Revision 1.56 2001/11/13 20:20:54 jongfoster
594 * Tabs->spaces, fixing a bug with missing {} around an if()
596 * Revision 1.55 2001/11/13 20:14:53 jongfoster
597 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
599 * Revision 1.54 2001/11/07 00:03:14 steudten
600 * Give reliable return value if an error
601 * occurs not just 0 with new daemon mode.
603 * Revision 1.53 2001/11/05 21:41:43 steudten
604 * Add changes to be a real daemon just for unix os.
605 * (change cwd to /, detach from controlling tty, set
606 * process group and session leader to the own process.
608 * Add some fatal-error log message for failed malloc().
609 * Add '-d' if compiled with 'configure --with-debug' to
610 * enable debug output.
612 * Revision 1.52 2001/10/26 20:11:20 jongfoster
613 * Fixing type mismatch
615 * Revision 1.51 2001/10/26 17:38:28 oes
618 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
619 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
620 * threads to call select() simultaneously. So, it's time to do a real, live,
621 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
622 * (native). Both versions will work, but using __OS2__ offers multi-threading.
624 * Revision 1.49 2001/10/23 21:41:35 jongfoster
625 * Added call to initialize the (statically-allocated of course)
626 * "out of memory" CGI response.
628 * Revision 1.48 2001/10/10 19:56:46 jongfoster
629 * Moving some code that wasn't cookie-related out of an #ifdef
632 * Revision 1.47 2001/10/10 16:44:36 oes
633 * Added CONNECT destination port limitation check
635 * Revision 1.46 2001/10/08 15:17:41 oes
636 * Re-enabled SSL forwarding
638 * Revision 1.45 2001/10/07 15:42:11 oes
639 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
641 * Moved downgrading of the HTTP version from parse_http_request to
642 * chat(), since we can't decide if it is necessary before we have
643 * determined the actions for the URL. The HTTP command is now
644 * *always* re-built so the repairs need no longer be special-cased.
646 * filter_popups now gets a csp pointer so it can raise the new
647 * CSP_FLAG_MODIFIED flag.
651 * Added configurable size limit for the IOB. If the IOB grows so
652 * large that the next read would exceed the limit, the header
653 * is generated, and the header & unfiltered buffer are flushed
654 * to the client. Chat then continues in non-buffering,
655 * non-filtering body mode.
657 * Revision 1.44 2001/10/02 18:13:57 oes
660 * Revision 1.43 2001/10/02 15:32:13 oes
661 * Moved generation of hdr
663 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
664 * Cleaning up 2 compiler warnings on OS/2.
666 * Revision 1.41 2001/09/16 17:05:14 jongfoster
667 * Removing unused #include showarg.h
669 * Revision 1.40 2001/09/16 15:41:45 jongfoster
670 * Fixing signed/unsigned comparison warning.
672 * Revision 1.39 2001/09/16 13:21:27 jongfoster
673 * Changes to use new list functions.
675 * Revision 1.38 2001/09/16 13:01:46 jongfoster
676 * Removing redundant function call that zeroed zalloc()'d memory.
678 * Revision 1.37 2001/09/10 11:12:24 oes
679 * Deleted unused variable
681 * Revision 1.36 2001/09/10 10:56:15 oes
682 * Silenced compiler warnings
684 * Revision 1.35 2001/07/31 14:44:22 oes
685 * Deleted unused size parameter from filter_popups()
687 * Revision 1.34 2001/07/30 22:08:36 jongfoster
688 * Tidying up #defines:
689 * - All feature #defines are now of the form FEATURE_xxx
690 * - Permanently turned off WIN_GUI_EDIT
691 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
693 * Revision 1.33 2001/07/29 19:32:00 jongfoster
694 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
696 * Revision 1.32 2001/07/29 18:47:05 jongfoster
697 * Adding missing #include "loadcfg.h"
699 * Revision 1.31 2001/07/29 12:17:48 oes
700 * Applied pthread fix by Paul Lieverse
702 * Revision 1.30 2001/07/25 22:57:13 jongfoster
703 * __BEOS__ no longer overrides FEATURE_PTHREAD.
704 * This is because FEATURE_PTHREAD will soon be widely used, so I
705 * want to keep it simple.
707 * Revision 1.29 2001/07/24 12:47:06 oes
708 * Applied BeOS support update by Eugenia
710 * Revision 1.28 2001/07/23 13:26:12 oes
711 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
713 * Revision 1.27 2001/07/19 19:09:47 haroon
714 * - Added code to take care of the situation where while processing the first
715 * server response (which includes the server header), after finding the end
716 * of the headers we were not looking past the end of the headers for
717 * content modification. I enabled it for filter_popups.
718 * Someone else should look to see if other similar operations should be
719 * done to the discarded portion of the buffer.
721 * Note 2001/07/20: No, the other content modification mechanisms will process
722 * the whole iob later anyway. --oes
724 * Revision 1.26 2001/07/18 12:31:36 oes
727 * Revision 1.25 2001/07/15 19:43:49 jongfoster
728 * Supports POSIX threads.
729 * Also removed some unused #includes.
731 * Revision 1.24 2001/07/13 14:00:40 oes
732 * - Generic content modification scheme:
733 * Each feature has its own applicability flag that is set
734 * from csp->action->flags.
735 * Replaced the "filtering" int flag , by a function pointer
736 * "content_filter" to the function that will do the content
737 * modification. If it is != NULL, the document will be buffered
738 * and processed through *content_filter, which must set
739 * csp->content_length and return a modified copy of the body
740 * or return NULL (on failiure).
741 * - Changed csp->is_text to the more generic bitmap csp->content_type
742 * which can currently take the valued CT_TEXT or CT_GIF
744 * - Removed all #ifdef PCRS
746 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
747 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
748 * the `block_acl' call. This prevents a compilation error when the user
749 * does not wish to use the "ACL" feature.
751 * Revision 1.22 2001/06/29 21:45:41 oes
752 * Indentation, CRLF->LF, Tab-> Space
754 * Revision 1.21 2001/06/29 13:29:36 oes
755 * - Cleaned up, improved comments
756 * - Unified all possible interceptors (CGI,
757 * block, trust, fast_redirect) in one
758 * place, with one (CGI) answer generation
759 * mechansim. Much clearer now.
760 * - Removed the GIF image generation, which
761 * is now done in filters.c:block_url()
762 * - Made error conditions like domain lookup
763 * failiure or (various) problems while talking
764 * to the server use cgi.c:error_response()
765 * instead of generating HTML/HTTP in chat() (yuck!)
766 * - Removed logentry from cancelled commit
768 * Revision 1.20 2001/06/09 10:55:28 jongfoster
769 * Changing BUFSIZ ==> BUFFER_SIZE
771 * Revision 1.19 2001/06/07 23:12:52 jongfoster
772 * Replacing function pointer in struct gateway with a directly
773 * called function forwarded_connect().
774 * Replacing struct gateway with struct forward_spec
776 * Revision 1.18 2001/06/03 19:12:16 oes
777 * introduced new cgi handling
779 * Revision 1.17 2001/06/01 20:07:23 jongfoster
780 * Now uses action +image-blocker{} rather than config->tinygif
782 * Revision 1.16 2001/06/01 18:49:17 jongfoster
783 * Replaced "list_share" with "list" - the tiny memory gain was not
784 * worth the extra complexity.
786 * Revision 1.15 2001/05/31 21:24:47 jongfoster
787 * Changed "permission" to "action" throughout.
788 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
789 * Moved vanilla wafer check into chat(), since we must now
790 * decide whether or not to add it based on the URL.
792 * Revision 1.14 2001/05/29 20:14:01 joergs
793 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
796 * Revision 1.13 2001/05/29 09:50:24 jongfoster
797 * Unified blocklist/imagelist/permissionslist.
798 * File format is still under discussion, but the internal changes
801 * Also modified interceptor behaviour:
802 * - We now intercept all URLs beginning with one of the following
803 * prefixes (and *only* these prefixes):
805 * * http://ijbswa.sf.net/config/
806 * * http://ijbswa.sourceforge.net/config/
807 * - New interceptors "home page" - go to http://i.j.b/ to see it.
808 * - Internal changes so that intercepted and fast redirect pages
809 * are not replaced with an image.
810 * - Interceptors now have the option to send a binary page direct
811 * to the client. (i.e. ijb-send-banner uses this)
812 * - Implemented show-url-info interceptor. (Which is why I needed
813 * the above interceptors changes - a typical URL is
814 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
815 * The previous mechanism would not have intercepted that, and
816 * if it had been intercepted then it then it would have replaced
819 * Revision 1.12 2001/05/27 22:17:04 oes
821 * - re_process_buffer no longer writes the modified buffer
822 * to the client, which was very ugly. It now returns the
823 * buffer, which it is then written by chat.
825 * - content_length now adjusts the Content-Length: header
826 * for modified documents rather than crunch()ing it.
827 * (Length info in csp->content_length, which is 0 for
828 * unmodified documents)
830 * - For this to work, sed() is called twice when filtering.
832 * Revision 1.11 2001/05/26 17:27:53 jongfoster
833 * Added support for CLF and fixed LOG_LEVEL_LOG.
834 * Also did CRLF->LF fix of my previous patch.
836 * Revision 1.10 2001/05/26 15:26:15 jongfoster
837 * ACL feature now provides more security by immediately dropping
838 * connections from untrusted hosts.
840 * Revision 1.9 2001/05/26 00:28:36 jongfoster
841 * Automatic reloading of config file.
842 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
843 * Most of the global variables have been moved to a new
844 * struct configuration_spec, accessed through csp->config->globalname
845 * Most of the globals remaining are used by the Win32 GUI.
847 * Revision 1.8 2001/05/25 22:43:18 jongfoster
848 * Fixing minor memory leak and buffer overflow.
850 * Revision 1.7 2001/05/25 22:34:30 jongfoster
853 * Revision 1.6 2001/05/23 00:13:58 joergs
854 * AmigaOS support fixed.
856 * Revision 1.5 2001/05/22 18:46:04 oes
858 * - Enabled filtering banners by size rather than URL
859 * by adding patterns that replace all standard banner
860 * sizes with the "Junkbuster" gif to the re_filterfile
862 * - Enabled filtering WebBugs by providing a pattern
863 * which kills all 1x1 images
865 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
866 * which is selected by the (nonstandard and therefore
867 * capital) letter 'U' in the option string.
868 * It causes the quantifiers to be ungreedy by default.
869 * Appending a ? turns back to greedy (!).
871 * - Added a new interceptor ijb-send-banner, which
872 * sends back the "Junkbuster" gif. Without imagelist or
873 * MSIE detection support, or if tinygif = 1, or the
874 * URL isn't recognized as an imageurl, a lame HTML
875 * explanation is sent instead.
877 * - Added new feature, which permits blocking remote
878 * script redirects and firing back a local redirect
880 * The feature is conditionally compiled, i.e. it
881 * can be disabled with --disable-fast-redirects,
882 * plus it must be activated by a "fast-redirects"
883 * line in the config file, has its own log level
884 * and of course wants to be displayed by show-proxy-args
885 * Note: Boy, all the #ifdefs in 1001 locations and
886 * all the fumbling with configure.in and acconfig.h
887 * were *way* more work than the feature itself :-(
889 * - Because a generic redirect template was needed for
890 * this, tinygif = 3 now uses the same.
892 * - Moved GIFs, and other static HTTP response templates
897 * - Removed some >400 CRs again (Jon, you really worked
900 * Revision 1.4 2001/05/21 19:34:01 jongfoster
901 * Made failure to bind() a fatal error.
903 * Revision 1.3 2001/05/20 01:21:20 jongfoster
904 * Version 2.9.4 checkin.
905 * - Merged popupfile and cookiefile, and added control over PCRS
906 * filtering, in new "permissionsfile".
907 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
908 * file error you now get a message box (in the Win32 GUI) rather
909 * than the program exiting with no explanation.
910 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
912 * - Removed tabs from "config"
913 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
914 * - Bumped up version number.
916 * Revision 1.2 2001/05/17 22:34:44 oes
917 * - Added hint on GIF char array generation to jcc.c
918 * - Cleaned CRLF's from the sources and related files
919 * - Repaired logging for REF and FRC
921 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
922 * Initial import of version 2.9.3 source tree
925 *********************************************************************/
931 #include <sys/types.h>
940 # ifndef FEATURE_PTHREAD
944 # include <windows.h>
945 # include <process.h>
946 # endif /* ndef FEATURE_PTHREAD */
949 # ifndef _WIN_CONSOLE
951 # endif /* ndef _WIN_CONSOLE */
952 # include "w32svrapi.h"
954 #else /* ifndef _WIN32 */
956 # if !defined (__OS2__)
958 # include <sys/wait.h>
959 # endif /* ndef __OS2__ */
960 # include <sys/time.h>
961 # include <sys/stat.h>
962 # include <sys/ioctl.h>
965 #include <sys/termios.h>
976 # include <socket.h> /* BeOS has select() for sockets only. */
977 # include <OS.h> /* declarations for threads and stuff. */
980 # if defined(__EMX__) || defined(__OS2__)
981 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
986 #define bzero(B,N) memset(B,0x00,n)
1000 #include "parsers.h"
1001 #include "killpopup.h"
1002 #include "miscutil.h"
1004 #include "jbsockets.h"
1005 #include "gateway.h"
1006 #include "actions.h"
1008 #include "loadcfg.h"
1009 #include "urlmatch.h"
1011 const char jcc_h_rcs[] = JCC_H_VERSION;
1012 const char project_h_rcs[] = PROJECT_H_VERSION;
1015 struct client_state clients[1];
1016 struct file_list files[1];
1018 #ifdef FEATURE_STATISTICS
1019 int urls_read = 0; /* total nr of urls read inc rejected */
1020 int urls_rejected = 0; /* total nr of urls rejected */
1021 #endif /* def FEATURE_STATISTICS */
1023 #ifdef FEATURE_GRACEFUL_TERMINATION
1024 int g_terminate = 0;
1027 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1028 static void sig_handler(int the_signal);
1030 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1031 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1032 static jb_err get_server_headers(struct client_state *csp);
1033 static const char *crunch_reason(const struct http_response *rsp);
1034 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1036 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1038 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1039 static jb_err change_request_destination(struct client_state *csp);
1040 static void chat(struct client_state *csp);
1041 static void serve(struct client_state *csp);
1043 static void usage(const char *myname);
1045 static void initialize_mutexes(void);
1046 static jb_socket bind_port_helper(struct configuration_spec *config);
1047 static void listen_loop(void);
1050 void serve(struct client_state *csp);
1051 #else /* ifndef AMIGA */
1052 static void serve(struct client_state *csp);
1053 #endif /* def AMIGA */
1056 static int32 server_thread(void *data);
1057 #endif /* def __BEOS__ */
1060 #define sleep(N) Sleep(((N) * 1000))
1064 #define sleep(N) DosSleep(((N) * 100))
1067 #ifdef FEATURE_PTHREAD
1068 pthread_mutex_t log_mutex;
1069 pthread_mutex_t log_init_mutex;
1071 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1072 pthread_mutex_t resolver_mutex;
1073 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1075 #ifndef HAVE_GMTIME_R
1076 pthread_mutex_t gmtime_mutex;
1077 #endif /* ndef HAVE_GMTIME_R */
1079 #ifndef HAVE_LOCALTIME_R
1080 pthread_mutex_t localtime_mutex;
1081 #endif /* ndef HAVE_GMTIME_R */
1084 pthread_mutex_t rand_mutex;
1085 #endif /* ndef HAVE_RANDOM */
1087 #endif /* FEATURE_PTHREAD */
1089 #if defined(unix) || defined(__EMX__)
1090 const char *basedir = NULL;
1091 const char *pidfile = NULL;
1092 int received_hup_signal = 0;
1093 #endif /* defined unix */
1095 /* HTTP snipplets. */
1096 static const char CSUCCEED[] =
1097 "HTTP/1.0 200 Connection established\r\n"
1098 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1100 static const char CHEADER[] =
1101 "HTTP/1.0 400 Invalid header received from browser\r\n"
1102 "Proxy-Agent: Privoxy " VERSION "\r\n"
1103 "Content-Type: text/plain\r\n"
1104 "Connection: close\r\n\r\n"
1105 "Invalid header received from browser.\r\n";
1107 static const char CFORBIDDEN[] =
1108 "HTTP/1.0 403 Connection not allowable\r\n"
1109 "Proxy-Agent: Privoxy " VERSION "\r\n"
1110 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1111 "Connection: close\r\n\r\n";
1113 static const char FTP_RESPONSE[] =
1114 "HTTP/1.0 400 Invalid request received from browser\r\n"
1115 "Content-Type: text/plain\r\n"
1116 "Connection: close\r\n\r\n"
1117 "Invalid request. Privoxy doesn't support FTP.\r\n";
1119 static const char GOPHER_RESPONSE[] =
1120 "HTTP/1.0 400 Invalid request received from browser\r\n"
1121 "Content-Type: text/plain\r\n"
1122 "Connection: close\r\n\r\n"
1123 "Invalid request. Privoxy doesn't support gopher.\r\n";
1125 /* XXX: should be a template */
1126 static const char MISSING_DESTINATION_RESPONSE[] =
1127 "HTTP/1.0 400 Bad request received from browser\r\n"
1128 "Proxy-Agent: Privoxy " VERSION "\r\n"
1129 "Content-Type: text/plain\r\n"
1130 "Connection: close\r\n\r\n"
1131 "Bad request. Privoxy was unable to extract the destination.\r\n";
1133 /* XXX: should be a template */
1134 static const char NO_SERVER_DATA_RESPONSE[] =
1135 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1136 "Proxy-Agent: Privoxy " VERSION "\r\n"
1137 "Content-Type: text/plain\r\n"
1138 "Connection: close\r\n\r\n"
1139 "Empty server or forwarder response.\r\n"
1140 "The connection was closed without sending any data.\r\n";
1143 /* XXX: should be a template */
1144 static const char NULL_BYTE_RESPONSE[] =
1145 "HTTP/1.0 400 Bad request received from browser\r\n"
1146 "Proxy-Agent: Privoxy " VERSION "\r\n"
1147 "Content-Type: text/plain\r\n"
1148 "Connection: close\r\n\r\n"
1149 "Bad request. Null byte(s) before end of request.\r\n";
1152 /* XXX: should be a template */
1153 static const char MESSED_UP_REQUEST_RESPONSE[] =
1154 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1155 "Proxy-Agent: Privoxy " VERSION "\r\n"
1156 "Content-Type: text/plain\r\n"
1157 "Connection: close\r\n\r\n"
1158 "Bad request. Messed up with header filters.\r\n";
1160 /* A function to crunch a response */
1161 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1163 /* Crunch function flags */
1164 #define CF_NO_FLAGS 0
1165 /* Cruncher applies to forced requests as well */
1166 #define CF_IGNORE_FORCE 1
1167 /* Crunched requests are counted for the block statistics */
1168 #define CF_COUNT_AS_REJECT 2
1170 /* A crunch function and its flags */
1173 const crunch_func_ptr cruncher;
1177 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1179 /* Complete list of cruncher functions */
1180 static const struct cruncher crunchers_all[] = {
1181 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1182 { block_url, CF_COUNT_AS_REJECT },
1183 #ifdef FEATURE_TRUST
1184 { trust_url, CF_COUNT_AS_REJECT },
1185 #endif /* def FEATURE_TRUST */
1186 { redirect_url, CF_NO_FLAGS },
1187 { dispatch_cgi, CF_IGNORE_FORCE},
1191 /* Light version, used after tags are applied */
1192 static const struct cruncher crunchers_light[] = {
1193 { block_url, CF_COUNT_AS_REJECT },
1194 { redirect_url, CF_NO_FLAGS },
1199 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1200 /*********************************************************************
1202 * Function : sig_handler
1204 * Description : Signal handler for different signals.
1205 * Exit gracefully on TERM and INT
1206 * or set a flag that will cause the errlog
1207 * to be reopened by the main thread on HUP.
1210 * 1 : the_signal = the signal cause this function to call
1214 *********************************************************************/
1215 static void sig_handler(int the_signal)
1221 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1232 received_hup_signal = 1;
1237 * We shouldn't be here, unless we catch signals
1238 * in main() that we can't handle here!
1240 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1248 /*********************************************************************
1250 * Function : client_protocol_is_unsupported
1252 * Description : Checks if the client used a known unsupported
1253 * protocol and deals with it by sending an error
1257 * 1 : csp = Current client state (buffers, headers, etc...)
1258 * 2 : req = the first request line send by the client
1260 * Returns : TRUE if an error response has been generated, or
1261 * FALSE if the request doesn't look invalid.
1263 *********************************************************************/
1264 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1266 char buf[BUFFER_SIZE];
1269 * If it's a FTP or gopher request, we don't support it.
1271 * These checks are better than nothing, but they might
1272 * not work in all configurations and some clients might
1273 * have problems digesting the answer.
1275 * They should, however, never cause more problems than
1276 * Privoxy's old behaviour (returning the misleading HTML
1279 * "Could not resolve http://(ftp|gopher)://example.org").
1281 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1283 if (!strncmpic(req, "GET ftp://", 10))
1285 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1286 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1287 csp->ip_addr_str, req);
1291 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1292 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1293 csp->ip_addr_str, req);
1295 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1297 write_socket(csp->cfd, buf, strlen(buf));
1306 /*********************************************************************
1308 * Function : get_request_destination_elsewhere
1310 * Description : If the client's request was redirected into
1311 * Privoxy without the client's knowledge,
1312 * the request line lacks the destination host.
1314 * This function tries to get it elsewhere,
1315 * provided accept-intercepted-requests is enabled.
1317 * "Elsewhere" currently only means "Host: header",
1318 * but in the future we may ask the redirecting
1319 * packet filter to look the destination up.
1321 * If the destination stays unknown, an error
1322 * response is send to the client and headers
1323 * are freed so that chat() can return directly.
1326 * 1 : csp = Current client state (buffers, headers, etc...)
1327 * 2 : headers = a header list
1329 * Returns : JB_ERR_OK if the destination is now known, or
1330 * JB_ERR_PARSE if it isn't.
1332 *********************************************************************/
1333 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1337 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1339 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1340 " Privoxy isn't configured to accept intercepted requests.",
1341 csp->ip_addr_str, csp->http->cmd);
1342 /* XXX: Use correct size */
1343 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1344 csp->ip_addr_str, csp->http->cmd);
1346 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1347 destroy_list(headers);
1349 return JB_ERR_PARSE;
1351 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1353 /* Split the domain we just got for pattern matching */
1354 init_domain_components(csp->http);
1360 /* We can't work without destination. Go spread the news.*/
1362 req = list_to_text(headers);
1364 /* XXX: Use correct size */
1365 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1366 csp->ip_addr_str, csp->http->cmd);
1367 log_error(LOG_LEVEL_ERROR,
1368 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1369 csp->ip_addr_str, csp->http->cmd, req);
1372 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1373 destroy_list(headers);
1375 return JB_ERR_PARSE;
1378 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1379 * to get the destination IP address, use it as host directly
1380 * or do a reverse DNS lookup first.
1385 /*********************************************************************
1387 * Function : get_server_headers
1389 * Description : Parses server headers in iob and fills them
1390 * into csp->headers so that they can later be
1394 * 1 : csp = Current client state (buffers, headers, etc...)
1396 * Returns : JB_ERR_OK if everything went fine, or
1397 * JB_ERR_PARSE if the headers were incomplete.
1399 *********************************************************************/
1400 static jb_err get_server_headers(struct client_state *csp)
1402 int continue_hack_in_da_house = 0;
1405 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1410 * continue hack in da house. Ignore the ending of
1411 * this head and continue enlisting header lines.
1412 * The reason is described below.
1414 enlist(csp->headers, "");
1415 continue_hack_in_da_house = 0;
1418 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1421 * It's a bodyless continue response, don't
1422 * stop header parsing after reaching it's end.
1424 * As a result Privoxy will concatenate the
1425 * next response's head and parse and deliver
1426 * the headers as if they belonged to one request.
1428 * The client will separate them because of the
1429 * empty line between them.
1431 * XXX: What we're doing here is clearly against
1432 * the intended purpose of the continue header,
1433 * and under some conditions (HTTP/1.0 client request)
1434 * it's a standard violation.
1436 * Anyway, "sort of against the spec" is preferable
1437 * to "always getting confused by Continue responses"
1438 * (Privoxy's behaviour before this hack was added)
1440 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1441 continue_hack_in_da_house = 1;
1443 else if (*header == '\0')
1446 * If the header is empty, but the Continue hack
1447 * isn't active, we can assume that we reached the
1448 * end of the buffer before we hit the end of the
1451 * Inform the caller an let it decide how to handle it.
1453 return JB_ERR_PARSE;
1457 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1460 * XXX: Should we quit the request and return a
1461 * out of memory error page instead?
1463 log_error(LOG_LEVEL_ERROR,
1464 "Out of memory while enlisting server headers. %s lost.",
1474 /*********************************************************************
1476 * Function : crunch_reason
1478 * Description : Translates the crunch reason code into a string.
1481 * 1 : rsp = a http_response
1483 * Returns : A string with the crunch reason or an error description.
1485 *********************************************************************/
1486 static const char *crunch_reason(const struct http_response *rsp)
1488 char * reason = NULL;
1490 assert(rsp != NULL);
1493 return "Internal error while searching for crunch reason";
1496 switch (rsp->reason)
1498 case RSP_REASON_UNSUPPORTED:
1499 reason = "Unsupported HTTP feature";
1501 case RSP_REASON_BLOCKED:
1504 case RSP_REASON_UNTRUSTED:
1505 reason = "Untrusted";
1507 case RSP_REASON_REDIRECTED:
1508 reason = "Redirected";
1510 case RSP_REASON_CGI_CALL:
1511 reason = "CGI Call";
1513 case RSP_REASON_NO_SUCH_DOMAIN:
1514 reason = "DNS failure";
1516 case RSP_REASON_FORWARDING_FAILED:
1517 reason = "Forwarding failed";
1519 case RSP_REASON_CONNECT_FAILED:
1520 reason = "Connection failure";
1522 case RSP_REASON_OUT_OF_MEMORY:
1523 reason = "Out of memory (may mask other reasons)";
1526 reason = "No reason recorded";
1534 /*********************************************************************
1536 * Function : send_crunch_response
1538 * Description : Delivers already prepared response for
1539 * intercepted requests, logs the interception
1540 * and frees the response.
1543 * 1 : csp = Current client state (buffers, headers, etc...)
1544 * 1 : rsp = Fully prepared response. Will be freed on exit.
1546 * Returns : Nothing.
1548 *********************************************************************/
1549 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1551 const struct http_request *http = csp->http;
1552 char status_code[4];
1554 assert(rsp != NULL);
1555 assert(rsp->head != NULL);
1560 * Not supposed to happen. If it does
1561 * anyway, treat it as an unknown error.
1563 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1564 /* return code doesn't matter */
1569 /* If rsp is still NULL, we have serious internal problems. */
1570 log_error(LOG_LEVEL_FATAL,
1571 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1575 * Extract the status code from the actual head
1576 * that was send to the client. It is the only
1577 * way to get it right for all requests, including
1578 * the fixed ones for out-of-memory problems.
1580 * A head starts like this: 'HTTP/1.1 200...'
1584 status_code[0] = rsp->head[9];
1585 status_code[1] = rsp->head[10];
1586 status_code[2] = rsp->head[11];
1587 status_code[3] = '\0';
1589 /* Write the answer to the client */
1590 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1591 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1593 /* There is nothing we can do about it. */
1594 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1597 /* Log that the request was crunched and why. */
1598 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1599 http->hostport, http->path, crunch_reason(rsp));
1600 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1601 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1603 /* Clean up and return */
1604 if (cgi_error_memory() != rsp)
1606 free_http_response(rsp);
1613 /*********************************************************************
1615 * Function : request_contains_null_bytes
1617 * Description : Checks for NULL bytes in the request and sends
1618 * an error message to the client if any were found.
1620 * XXX: currently not used, see comment in chat().
1623 * 1 : csp = Current client state (buffers, headers, etc...)
1624 * 2 : buf = Data from the client's request to check.
1625 * 3 : len = The data length.
1627 * Returns : TRUE if the request contained one or more NULL bytes, or
1630 *********************************************************************/
1631 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1633 size_t c_len; /* Request lenght when treated as C string */
1635 c_len = strlen(buf);
1640 * Null byte(s) found. Log the request,
1641 * return an error response and hang up.
1643 size_t tmp_len = c_len;
1648 * Replace NULL byte(s) with '°' characters
1649 * so the request can be logged as string.
1650 * XXX: Is there a better replacement character?
1653 tmp_len += strlen(buf+tmp_len);
1654 } while (tmp_len < len);
1656 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1657 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1658 log_error(LOG_LEVEL_HEADER,
1659 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1661 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1663 /* XXX: Log correct size */
1664 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1674 /*********************************************************************
1676 * Function : crunch_response_triggered
1678 * Description : Checks if the request has to be crunched,
1679 * and delivers the crunch response if necessary.
1682 * 1 : csp = Current client state (buffers, headers, etc...)
1683 * 2 : crunchers = list of cruncher functions to run
1685 * Returns : TRUE if the request was answered with a crunch response
1688 *********************************************************************/
1689 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1691 struct http_response *rsp = NULL;
1692 const struct cruncher *c;
1695 * If CGI request crunching is disabled,
1696 * check the CGI dispatcher out of order to
1697 * prevent unintentional blocks or redirects.
1699 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1700 && (NULL != (rsp = dispatch_cgi(csp))))
1702 /* Deliver, log and free the interception response. */
1703 send_crunch_response(csp, rsp);
1707 for (c = crunchers; c->cruncher != NULL; c++)
1710 * Check the cruncher if either Privoxy is toggled
1711 * on and the request isn't forced, or if the cruncher
1712 * applies to forced requests as well.
1714 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1715 !(csp->flags & CSP_FLAG_FORCED)) ||
1716 (c->flags & CF_IGNORE_FORCE))
1718 rsp = c->cruncher(csp);
1721 /* Deliver, log and free the interception response. */
1722 send_crunch_response(csp, rsp);
1723 #ifdef FEATURE_STATISTICS
1724 if (c->flags & CF_COUNT_AS_REJECT)
1726 csp->flags |= CSP_FLAG_REJECTED;
1728 #endif /* def FEATURE_STATISTICS */
1739 /*********************************************************************
1741 * Function : build_request_line
1743 * Description : Builds the HTTP request line.
1745 * If a HTTP forwarder is used it expects the whole URL,
1746 * web servers only get the path.
1749 * 1 : csp = Current client state (buffers, headers, etc...)
1750 * 2 : fwd = The forwarding spec used for the request
1751 * XXX: Should use http->fwd instead.
1752 * 3 : request_line = The old request line which will be replaced.
1754 * Returns : Nothing. Terminates in case of memory problems.
1756 *********************************************************************/
1757 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1759 struct http_request *http = csp->http;
1761 assert(http->ssl == 0);
1764 * Downgrade http version from 1.1 to 1.0
1765 * if +downgrade action applies.
1767 if ( (csp->action->flags & ACTION_DOWNGRADE)
1768 && (!strcmpic(http->ver, "HTTP/1.1")))
1771 http->ver = strdup("HTTP/1.0");
1773 if (http->ver == NULL)
1775 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1780 * Rebuild the request line.
1782 freez(*request_line);
1783 *request_line = strdup(http->gpc);
1784 string_append(request_line, " ");
1786 if (fwd->forward_host)
1788 string_append(request_line, http->url);
1792 string_append(request_line, http->path);
1794 string_append(request_line, " ");
1795 string_append(request_line, http->ver);
1797 if (*request_line == NULL)
1799 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1801 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1805 /*********************************************************************
1807 * Function : change_request_destination
1809 * Description : Parse a (rewritten) request line and regenerate
1810 * the http request data.
1813 * 1 : csp = Current client state (buffers, headers, etc...)
1815 * Returns : Forwards the parse_http_request() return code.
1816 * Terminates in case of memory problems.
1818 *********************************************************************/
1819 static jb_err change_request_destination(struct client_state *csp)
1821 struct http_request *http = csp->http;
1824 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1825 free_http_request(http);
1826 err = parse_http_request(csp->headers->first->str, http, csp);
1827 if (JB_ERR_OK != err)
1829 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1830 jb_err_to_string(err));
1832 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1833 if (http->ocmd == NULL)
1835 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1842 /*********************************************************************
1846 * Description : Once a connection to the client has been accepted,
1847 * this function is called (via serve()) to handle the
1848 * main business of the communication. When this
1849 * function returns, the caller must close the client
1852 * FIXME: chat is nearly thousand lines long.
1856 * 1 : csp = Current client state (buffers, headers, etc...)
1858 * Returns : Nothing.
1860 *********************************************************************/
1861 static void chat(struct client_state *csp)
1863 char buf[BUFFER_SIZE];
1871 int ms_iis5_hack = 0;
1872 size_t byte_count = 0;
1873 int forwarded_connect_retries = 0;
1874 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1875 const struct forward_spec * fwd;
1876 struct http_request *http;
1877 int len; /* for buffer sizes (and negative error codes) */
1879 #ifdef FEATURE_KILL_POPUPS
1880 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1881 #endif /* def FEATURE_KILL_POPUPS */
1883 /* Function that does the content filtering for the current request */
1884 filter_function_ptr content_filter = NULL;
1886 /* Skeleton for HTTP response, if we should intercept the request */
1887 struct http_response *rsp;
1889 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1890 struct list header_list;
1891 struct list *headers = &header_list;
1895 memset(buf, 0, sizeof(buf));
1898 * Read the client's request. Note that since we're not using select() we
1899 * could get blocked here if a client connected, then didn't say anything!
1904 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1906 if (len <= 0) break; /* error! */
1909 * If there is no memory left for buffering the
1910 * request, there is nothing we can do but hang up
1912 if (add_to_iob(csp, buf, len))
1917 req = get_header(csp);
1919 } while ((NULL != req) && ('\0' == *req));
1921 if ((NULL != req) && ('\0' != *req))
1923 /* Request received. Validate and parse it. */
1927 * XXX: Temporary disabled to prevent problems
1928 * with POST requests whose bodies are allowed to
1929 * contain NULL bytes. BR#1730105.
1931 * The main purpose of this check is to properly
1932 * log stuff like BitTorrent traffic and other junk
1933 * that hits public proxies. It's not required for
1934 * Privoxy to functions as those requests are discarded
1937 * It probably should be rewritten to only check
1938 * the head of the request. Another option would
1939 * be to let all POST requests pass, although that
1940 * may not be good enough.
1942 if (request_contains_null_bytes(csp, buf, len))
1944 /* NULL bytes found and dealt with, just hang up. */
1949 /* Does the request line look invalid? */
1950 if (client_protocol_is_unsupported(csp, req))
1953 * Yes. The request has already been
1954 * answered with a error response, the buffers
1955 * were freed and we're done with chatting.
1960 #ifdef FEATURE_FORCE_LOAD
1962 * If this request contains the FORCE_PREFIX and blocks
1963 * aren't enforced, get rid of it and set the force flag.
1965 if (strstr(req, FORCE_PREFIX))
1967 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1969 log_error(LOG_LEVEL_FORCE,
1970 "Ignored force prefix in request: \"%s\".", req);
1974 strclean(req, FORCE_PREFIX);
1975 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
1976 csp->flags |= CSP_FLAG_FORCED;
1980 #endif /* def FEATURE_FORCE_LOAD */
1981 err = parse_http_request(req, http, csp);
1982 if (JB_ERR_OK != err)
1984 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
1990 if (http->cmd == NULL)
1992 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1993 /* XXX: Use correct size */
1994 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1995 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
1997 free_http_request(http);
2001 /* grab the rest of the client's headers */
2005 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2007 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2010 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2015 * If there is no memory left for buffering the
2016 * request, there is nothing we can do but hang up
2018 if (add_to_iob(csp, buf, len))
2025 if (p == NULL) break;
2032 if (http->host == NULL)
2035 * If we still don't know the request destination,
2036 * the request is invalid or the client uses
2037 * Privoxy without its knowledge.
2039 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2042 * Our attempts to get the request destination
2043 * elsewhere failed or Privoxy is configured
2044 * to only accept proxy requests.
2046 * An error response has already been send
2047 * and we're done here.
2054 * Determine the actions for this URL
2056 #ifdef FEATURE_TOGGLE
2057 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2059 /* Most compatible set of actions (i.e. none) */
2060 init_current_action(csp->action);
2063 #endif /* ndef FEATURE_TOGGLE */
2065 url_actions(http, csp);
2069 * Save a copy of the original request for logging
2071 http->ocmd = strdup(http->cmd);
2073 if (http->ocmd == NULL)
2075 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2078 enlist(csp->headers, http->cmd);
2080 /* Append the previously read headers */
2081 list_append_list_unique(csp->headers, headers);
2082 destroy_list(headers);
2084 err = sed(client_patterns, add_client_headers, csp);
2085 if (JB_ERR_OK != err)
2087 assert(err == JB_ERR_PARSE);
2088 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2090 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2092 /* Check request line for rewrites. */
2093 if ((NULL == csp->headers->first->str)
2094 || (strcmp(http->cmd, csp->headers->first->str) &&
2095 (JB_ERR_OK != change_request_destination(csp))))
2098 * A header filter broke the request line - bail out.
2100 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2101 /* XXX: Use correct size */
2102 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2103 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2105 free_http_request(http);
2109 /* decide how to route the HTTP request */
2110 if (NULL == (fwd = forward_url(http, csp)))
2112 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2113 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2117 * build the http request to send to the server
2118 * we have to do one of the following:
2120 * create = use the original HTTP request to create a new
2121 * HTTP request that has either the path component
2122 * without the http://domainspec (w/path) or the
2123 * full orininal URL (w/url)
2124 * Note that the path and/or the HTTP version may
2125 * have been altered by now.
2127 * connect = Open a socket to the host:port of the server
2128 * and short-circuit server and client socket.
2130 * pass = Pass the request unchanged if forwarding a CONNECT
2131 * request to a parent proxy. Note that we'll be sending
2132 * the CFAIL message ourselves if connecting to the parent
2133 * fails, but we won't send a CSUCCEED message if it works,
2134 * since that would result in a double message (ours and the
2135 * parent's). After sending the request to the parent, we simply
2138 * here's the matrix:
2141 * +--------+--------+
2143 * 0 | create | connect|
2145 * Forwarding +--------+--------+
2147 * 1 | create | pass |
2149 * +--------+--------+
2154 * Check if a CONNECT request is allowable:
2155 * In the absence of a +limit-connect action, allow only port 443.
2156 * If there is an action, allow whatever matches the specificaton.
2160 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
2161 || (csp->action->flags & ACTION_LIMIT_CONNECT
2162 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
2164 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2167 * The response may confuse some clients,
2168 * but makes unblocking easier.
2170 * XXX: It seems to work with all major browsers,
2171 * so we should consider returning a body by default someday ...
2173 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2174 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2175 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2177 csp->action->flags |= ACTION_BLOCK;
2182 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2183 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2184 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2185 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2187 assert(NULL != csp->http->ocmd);
2188 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2190 list_remove_all(csp->headers);
2192 * XXX: For consistency we might want to log a crunch message here.
2201 freez(csp->headers->first->str);
2202 build_request_line(csp, fwd, &csp->headers->first->str);
2205 hdr = list_to_text(csp->headers);
2208 /* FIXME Should handle error properly */
2209 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2213 * We have a request. Check if one of the crunchers wants it.
2215 if (crunch_response_triggered(csp, crunchers_all))
2218 * Yes. The client got the crunch response
2219 * and we are done here after cleaning up.
2222 list_remove_all(csp->headers);
2228 * The headers can't be removed earlier because
2229 * they were still needed for the referrer check
2230 * in case of CGI crunches.
2232 * XXX: Would it be worth to move the referrer check
2233 * into client_referrer() and set a flag if it's trusted?
2235 list_remove_all(csp->headers);
2237 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2239 if (fwd->forward_host)
2241 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2242 fwd->forward_host, fwd->forward_port, http->hostport);
2246 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2249 /* here we connect to the server, gateway, or the forwarder */
2251 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2252 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2254 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2255 forwarded_connect_retries, http->hostport);
2258 if (csp->sfd == JB_INVALID_SOCKET)
2260 if (fwd->type != SOCKS_NONE)
2263 rsp = error_response(csp, "forwarding-failed", errno);
2265 else if (errno == EINVAL)
2267 rsp = error_response(csp, "no-such-domain", errno);
2271 rsp = error_response(csp, "connect-failed", errno);
2272 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2277 /* Write the answer to the client */
2280 send_crunch_response(csp, rsp);
2287 if (fwd->forward_host || (http->ssl == 0))
2289 /* write the client's (modified) header to the server
2290 * (along with anything else that may be in the buffer)
2293 if (write_socket(csp->sfd, hdr, strlen(hdr))
2294 || (flush_socket(csp->sfd, csp) < 0))
2296 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2299 rsp = error_response(csp, "connect-failed", errno);
2303 send_crunch_response(csp, rsp);
2313 * We're running an SSL tunnel and we're not forwarding,
2314 * so just send the "connect succeeded" message to the
2315 * client, flush the rest, and get out of the way.
2317 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2325 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2327 /* we're finished with the client's header */
2330 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2332 /* pass data between the client and server
2333 * until one or the other shuts down the connection.
2342 * FD_ZERO here seems to point to an errant macro which crashes.
2343 * So do this by hand for now...
2345 memset(&rfds,0x00,sizeof(fd_set));
2349 FD_SET(csp->cfd, &rfds);
2350 FD_SET(csp->sfd, &rfds);
2352 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2356 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2360 /* this is the body of the browser's request
2361 * just read it and write it.
2364 if (FD_ISSET(csp->cfd, &rfds))
2366 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2370 break; /* "game over, man" */
2373 if (write_socket(csp->sfd, buf, (size_t)len))
2375 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2382 * The server wants to talk. It could be the header or the body.
2383 * If `hdr' is null, then it's the header otherwise it's the body.
2384 * FIXME: Does `hdr' really mean `host'? No.
2388 if (FD_ISSET(csp->sfd, &rfds))
2391 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2395 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2397 if (http->ssl && (fwd->forward_host == NULL))
2400 * Just hang up. We already confirmed the client's CONNECT
2401 * request with status code 200 and unencrypted content is
2402 * no longer welcome.
2404 log_error(LOG_LEVEL_ERROR,
2405 "CONNECT already confirmed. Unable to tell the client about the problem.");
2408 else if (byte_count)
2411 * Just hang up. We already transmitted the original headers
2412 * and parts of the original content and therefore missed the
2413 * chance to send an error message (without risking data corruption).
2415 * XXX: we could retry with a fancy range request here.
2417 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2418 "Unable to tell the client about the problem.");
2422 rsp = error_response(csp, "connect-failed", errno);
2426 send_crunch_response(csp, rsp);
2432 /* Add a trailing zero. This lets filter_popups
2433 * use string operations.
2437 #ifdef FEATURE_KILL_POPUPS
2438 /* Filter the popups on this read. */
2439 if (block_popups_now)
2441 filter_popups(buf, csp);
2443 #endif /* def FEATURE_KILL_POPUPS */
2445 /* Normally, this would indicate that we've read
2446 * as much as the server has sent us and we can
2447 * close the client connection. However, Microsoft
2448 * in its wisdom has released IIS/5 with a bug that
2449 * prevents it from sending the trailing \r\n in
2450 * a 302 redirect header (and possibly other headers).
2451 * To work around this if we've haven't parsed
2452 * a full header we'll append a trailing \r\n
2453 * and see if this now generates a valid one.
2455 * This hack shouldn't have any impacts. If we've
2456 * already transmitted the header or if this is a
2457 * SSL connection, then we won't bother with this
2458 * hack. So we only work on partially received
2459 * headers. If we append a \r\n and this still
2460 * doesn't generate a valid header, then we won't
2461 * transmit anything to the client.
2466 if (server_body || http->ssl)
2469 * If we have been buffering up the document,
2470 * now is the time to apply content modification
2471 * and send the result to the client.
2475 p = execute_content_filter(csp, content_filter);
2477 * If the content filter fails, use the original
2478 * buffer and length.
2479 * (see p != NULL ? p : csp->iob->cur below)
2483 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2486 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2488 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2491 hdr = list_to_text(csp->headers);
2494 /* FIXME Should handle error properly */
2495 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2499 * Shouldn't happen because this was the second sed run
2500 * and tags are only created for the first one.
2502 assert(!crunch_response_triggered(csp, crunchers_all));
2504 if (write_socket(csp->cfd, hdr, strlen(hdr))
2505 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2507 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2517 break; /* "game over, man" */
2521 * This is NOT the body, so
2522 * Let's pretend the server just sent us a blank line.
2524 log_error(LOG_LEVEL_INFO,
2525 "Malformerd HTTP headers detected and MS IIS5 hack enabled. "
2526 "Expect an invalid response or even no response at all.");
2527 snprintf(buf, sizeof(buf), "\r\n");
2528 len = (int)strlen(buf);
2531 * Now, let the normal header parsing algorithm below do its
2532 * job. If it fails, we'll exit instead of continuing.
2539 * If this is an SSL connection or we're in the body
2540 * of the server document, just write it to the client,
2541 * unless we need to buffer the body for later content-filtering
2544 if (server_body || http->ssl)
2549 * If there is no memory left for buffering the content, or the buffer limit
2550 * has been reached, switch to non-filtering mode, i.e. make & write the
2551 * header, flush the iob and buf, and get out of the way.
2553 if (add_to_iob(csp, buf, len))
2558 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2560 hdr = list_to_text(csp->headers);
2564 * Memory is too tight to even generate the header.
2565 * Send our static "Out-of-memory" page.
2567 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2568 rsp = cgi_error_memory();
2569 send_crunch_response(csp, rsp);
2573 hdrlen = strlen(hdr);
2575 if (write_socket(csp->cfd, hdr, hdrlen)
2576 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2577 || (write_socket(csp->cfd, buf, (size_t)len)))
2579 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2586 * Reset the byte_count to the amount of bytes
2587 * we just flushed. len will be added a few lines below,
2588 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2590 byte_count = (size_t)flushed;
2592 content_filter = NULL;
2598 if (write_socket(csp->cfd, buf, (size_t)len))
2600 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2604 byte_count += (size_t)len;
2609 /* we're still looking for the end of the
2610 * server's header ... (does that make header
2611 * parsing an "out of body experience" ?
2615 * buffer up the data we just read. If that fails,
2616 * there's little we can do but send our static
2617 * out-of-memory page.
2619 if (add_to_iob(csp, buf, len))
2621 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2622 rsp = cgi_error_memory();
2623 send_crunch_response(csp, rsp);
2628 /* Convert iob into something sed() can digest */
2629 if (JB_ERR_PARSE == get_server_headers(csp))
2633 /* Well, we tried our MS IIS/5
2634 * hack and it didn't work.
2635 * The header is incomplete
2636 * and there isn't anything
2637 * we can do about it.
2643 /* Since we have to wait for
2644 * more from the server before
2645 * we can parse the headers
2646 * we just continue here.
2652 /* Did we actually get anything? */
2653 if (NULL == csp->headers->first)
2655 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2656 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2657 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2658 free_http_request(http);
2662 /* we have now received the entire header.
2663 * filter it and send the result to the client
2665 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2667 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2669 hdr = list_to_text(csp->headers);
2672 /* FIXME Should handle error properly */
2673 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2676 if (crunch_response_triggered(csp, crunchers_light))
2679 * One of the tags created by a server-header
2680 * tagger triggered a crunch. We already
2681 * delivered the crunch response to the client
2682 * and are done here after cleaning up.
2687 /* Buffer and pcrs filter this if appropriate. */
2689 if (!http->ssl) /* We talk plaintext */
2692 #ifdef FEATURE_KILL_POPUPS
2693 /* Start blocking popups if appropriate. */
2694 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2695 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2697 block_popups_now = 1;
2699 * Filter the part of the body that came in the same read
2700 * as the last headers:
2702 filter_popups(csp->iob->cur, csp);
2704 #endif /* def FEATURE_KILL_POPUPS */
2705 content_filter = get_filter_function(csp);
2708 * Only write if we're not buffering for content modification
2710 if (!content_filter)
2712 /* write the server's (modified) header to
2713 * the client (along with anything else that
2714 * may be in the buffer)
2717 if (write_socket(csp->cfd, hdr, strlen(hdr))
2718 || ((len = flush_socket(csp->cfd, csp)) < 0))
2720 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2722 /* the write failed, so don't bother
2723 * mentioning it to the client...
2724 * it probably can't hear us anyway.
2730 byte_count += (size_t)len;
2733 /* we're finished with the server's header */
2738 /* If this was a MS IIS/5 hack then it means
2739 * the server has already closed the
2740 * connection. Nothing more to read. Time
2751 return; /* huh? we should never get here */
2754 if (csp->content_length == 0)
2757 * If Privoxy didn't recalculate the
2758 * Content-Lenght, byte_count is still
2761 csp->content_length = byte_count;
2764 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2765 csp->ip_addr_str, http->ocmd, csp->content_length);
2769 /*********************************************************************
2773 * Description : This is little more than chat. We only "serve" to
2774 * to close any socket that chat may have opened.
2777 * 1 : csp = Current client state (buffers, headers, etc...)
2781 *********************************************************************/
2783 void serve(struct client_state *csp)
2784 #else /* ifndef AMIGA */
2785 static void serve(struct client_state *csp)
2786 #endif /* def AMIGA */
2789 close_socket(csp->cfd);
2791 if (csp->sfd != JB_INVALID_SOCKET)
2793 close_socket(csp->sfd);
2796 csp->flags &= ~CSP_FLAG_ACTIVE;
2802 /*********************************************************************
2804 * Function : server_thread
2806 * Description : We only exist to call `serve' in a threaded environment.
2809 * 1 : data = Current client state (buffers, headers, etc...)
2811 * Returns : Always 0.
2813 *********************************************************************/
2814 static int32 server_thread(void *data)
2816 serve((struct client_state *) data);
2824 /*********************************************************************
2828 * Description : Print usage info & exit.
2830 * Parameters : Pointer to argv[0] for identifying ourselves
2834 *********************************************************************/
2835 static void usage(const char *myname)
2837 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2841 #endif /* defined(unix) */
2844 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2845 #endif /* defined(unix) */
2846 "[--version] [configfile]\n"
2847 "Aborting\n", myname);
2852 #endif /* defined(unix) */
2855 /*********************************************************************
2857 * Function : initialize_mutexes
2859 * Description : Prepares mutexes if mutex support is available.
2863 * Returns : Void, exits in case of errors.
2865 *********************************************************************/
2866 static void initialize_mutexes(void)
2870 #ifdef FEATURE_PTHREAD
2872 * Prepare global mutex semaphores
2874 err = pthread_mutex_init(&log_mutex, 0);
2876 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2879 * XXX: The assumptions below are a bit naive
2880 * and can cause locks that aren't necessary.
2882 * For example older FreeBSD versions (< 6.x?)
2883 * have no gethostbyname_r, but gethostbyname is
2886 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2887 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2888 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2890 * XXX: should we use a single mutex for
2891 * localtime() and gmtime() as well?
2893 #ifndef HAVE_GMTIME_R
2894 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2895 #endif /* ndef HAVE_GMTIME_R */
2897 #ifndef HAVE_LOCALTIME_R
2898 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2899 #endif /* ndef HAVE_GMTIME_R */
2902 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2903 #endif /* ndef HAVE_RANDOM */
2904 #endif /* FEATURE_PTHREAD */
2907 * TODO: mutex support for mingw32 would be swell.
2912 printf("Fatal error. Mutex initialization failed: %s.\n",
2921 /*********************************************************************
2925 * Description : Load the config file and start the listen loop.
2926 * This function is a lot more *sane* with the `load_config'
2927 * and `listen_loop' functions; although it stills does
2928 * a *little* too much for my taste.
2931 * 1 : argc = Number of parameters (including $0).
2932 * 2 : argv = Array of (char *)'s to the parameters.
2934 * Returns : 1 if : can't open config file, unrecognized directive,
2935 * stats requested in multi-thread mode, can't open the
2936 * log file, can't open the jar file, listen port is invalid,
2937 * any load fails, and can't bind port.
2939 * Else main never returns, the process must be signaled
2940 * to terminate execution. Or, on Windows, use the
2941 * "File", "Exit" menu option.
2943 *********************************************************************/
2945 int real_main(int argc, const char *argv[])
2947 int main(int argc, const char *argv[])
2951 unsigned int random_seed;
2953 struct passwd *pw = NULL;
2954 struct group *grp = NULL;
2957 char *pre_chroot_nslookup_to_load_resolver = NULL;
2964 #if !defined(_WIN32)
2972 * Parse the command line arguments
2974 * XXX: simply printing usage information in case of
2975 * invalid arguments isn't particular user friendly.
2977 while (++argc_pos < argc)
2980 /* Check to see if the service must be installed or uninstalled */
2981 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2983 const char *pName = argv[argc_pos] + 9;
2986 exit( (install_service(pName)) ? 0 : 1 );
2988 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
2990 const char *pName = argv[argc_pos] + 11;
2993 exit((uninstall_service(pName)) ? 0 : 1);
2995 else if (strcmp(argv[argc_pos], "--service" ) == 0)
2997 bRunAsService = TRUE;
2998 w32_set_service_cwd();
2999 atexit(w32_service_exit_notify);
3002 #endif /* defined(_WIN32) */
3005 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3007 if (strcmp(argv[argc_pos], "--help") == 0)
3012 else if(strcmp(argv[argc_pos], "--version") == 0)
3014 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3020 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3025 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3027 if (++argc_pos == argc) usage(argv[0]);
3028 pidfile = strdup(argv[argc_pos]);
3031 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3033 if (++argc_pos == argc) usage(argv[argc_pos]);
3035 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3038 if (NULL == (grp = getgrnam(p)))
3040 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3044 if (NULL == (pw = getpwnam(argv[argc_pos])))
3046 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3049 if (p != NULL) *--p = '\0';
3052 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3054 if (++argc_pos == argc) usage(argv[0]);
3055 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3058 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3062 #endif /* defined(unix) */
3064 else if (argc_pos + 1 != argc)
3067 * This is neither the last command line
3068 * option, nor was it recognized before,
3069 * therefore it must be invalid.
3075 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3077 configfile = argv[argc_pos];
3080 } /* -END- while (more arguments) */
3083 if ( *configfile != '/' )
3085 char cwd[BUFFER_SIZE];
3087 size_t abs_file_size;
3089 /* make config-filename absolute here */
3090 if (NULL == getcwd(cwd, sizeof(cwd)))
3092 perror("failed to get current working directory");
3097 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3098 basedir = strdup(cwd);
3100 if (NULL == basedir ||
3101 NULL == (abs_file = malloc(abs_file_size)))
3103 perror("malloc failed");
3106 strlcpy(abs_file, basedir, abs_file_size);
3107 strlcat(abs_file, "/", abs_file_size );
3108 strlcat(abs_file, configfile, abs_file_size);
3109 configfile = abs_file;
3111 #endif /* defined unix */
3115 clients->next = NULL;
3117 /* XXX: factor out initialising after the next stable release. */
3120 #elif defined(_WIN32)
3124 /* Prepare mutexes if supported and necessary. */
3125 initialize_mutexes();
3127 /* Enable logging until further notice. */
3128 init_log_module(Argv[0]);
3130 random_seed = (unsigned int)time(NULL);
3132 srandom(random_seed);
3133 #elif defined (_WIN32)
3135 * See pick_from_range() in miscutil.c for details.
3137 log_error(LOG_LEVEL_INFO,
3138 "No thread-safe PRNG implemented for your platform. "
3139 "Using weak \'randomization\' factor which will "
3140 "limit the already questionable usefulness of "
3141 "header-time-randomizing actions (disabled by default).");
3144 #endif /* ifdef HAVE_RANDOM */
3147 * Unix signal handling
3149 * Catch the abort, interrupt and terminate signals for a graceful exit
3150 * Catch the hangup signal so the errlog can be reopened.
3151 * Ignore the broken pipe signals (FIXME: Why?)
3153 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3156 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3157 const int ignored_signals[] = { SIGPIPE, 0 };
3159 for (idx = 0; catched_signals[idx] != 0; idx++)
3161 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3162 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3164 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3165 #endif /* ifdef sun */
3167 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3171 for (idx = 0; ignored_signals[idx] != 0; idx++)
3173 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3175 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3180 #else /* ifdef _WIN32 */
3181 # ifdef _WIN_CONSOLE
3183 * We *are* in a windows console app.
3184 * Print a verbose messages about FAQ's and such
3186 printf("%s", win32_blurb);
3187 # endif /* def _WIN_CONSOLE */
3188 #endif /* def _WIN32 */
3191 /* Initialize the CGI subsystem */
3192 cgi_init_error_messages();
3195 * If runnig on unix and without the --nodaemon
3196 * option, become a daemon. I.e. fork, detach
3197 * from tty and get process group leadership
3210 if ( pid < 0 ) /* error */
3215 else if ( pid != 0 ) /* parent */
3220 * must check for errors
3221 * child died due to missing files aso
3224 wpid = waitpid( pid, &status, WNOHANG );
3233 /* Should be more portable, but not as well tested */
3238 #else /* ndef __FreeBSD__ */
3240 #endif /* ndef __FreeBSD__ */
3241 fd = open("/dev/tty", O_RDONLY);
3244 /* no error check here */
3245 ioctl( fd, TIOCNOTTY,0 );
3250 * stderr (fd 2) will be closed later on, when the
3251 * log file has been parsed.
3258 } /* -END- if (!no_daemon) */
3261 * As soon as we have written the PID file, we can switch
3262 * to the user and group ID indicated by the --user option
3268 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3270 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3276 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3278 /* Read the time zone file from /etc before doing chroot. */
3280 if (NULL != pre_chroot_nslookup_to_load_resolver
3281 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3283 /* Initialize resolver library. */
3284 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3286 if (chroot(pw->pw_dir) < 0)
3288 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3292 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3295 if (setuid(pw->pw_uid))
3297 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3301 char putenv_dummy[64];
3303 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3304 if (putenv(putenv_dummy) != 0)
3306 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3309 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3310 if (putenv(putenv_dummy) != 0)
3312 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3318 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3321 #endif /* defined unix */
3324 /* This will be FALSE unless the command line specified --service
3328 /* Yup, so now we must attempt to establish a connection
3329 * with the service dispatcher. This will only work if this
3330 * process was launched by the service control manager to
3331 * actually run as a service. If this isn't the case, i've
3332 * known it take around 30 seconds or so for the call to return.
3335 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3336 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3338 /* Service has run, and at this point is now being stopped, so just return */
3343 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3345 /* An error occurred. Usually it's because --service was wrongly specified
3346 * and we were unable to connect to the Service Control Dispatcher because
3347 * it wasn't expecting us and is therefore not listening.
3349 * For now, just continue below to call the listen_loop function.
3352 #endif /* def _WIN32 */
3362 /*********************************************************************
3364 * Function : bind_port_helper
3366 * Description : Bind the listen port. Handles logging, and aborts
3370 * 1 : config = Privoxy configuration. Specifies port
3373 * Returns : Port that was opened.
3375 *********************************************************************/
3376 static jb_socket bind_port_helper(struct configuration_spec * config)
3381 if ( (config->haddr != NULL)
3382 && (config->haddr[0] == '1')
3383 && (config->haddr[1] == '2')
3384 && (config->haddr[2] == '7')
3385 && (config->haddr[3] == '.') )
3387 log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
3390 else if (config->haddr == NULL)
3392 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3397 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3398 config->hport, config->haddr);
3401 result = bind_port(config->haddr, config->hport, &bfd);
3408 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3409 "There may be another Privoxy or some other "
3410 "proxy running on port %d",
3411 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3412 config->hport, config->hport);
3415 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3416 "The hostname is not resolvable",
3417 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3420 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3421 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3424 /* shouldn't get here */
3425 return JB_INVALID_SOCKET;
3428 config->need_bind = 0;
3435 /* Without this simple workaround we get this compiler warning from _beginthread
3436 * warning C4028: formal parameter 1 different from declaration
3438 void w32_service_listen_loop(void *p)
3442 #endif /* def _WIN32 */
3445 /*********************************************************************
3447 * Function : listen_loop
3449 * Description : bind the listen port and enter a "FOREVER" listening loop.
3455 *********************************************************************/
3456 static void listen_loop(void)
3458 struct client_state *csp = NULL;
3460 struct configuration_spec * config;
3462 config = load_config();
3464 bfd = bind_port_helper(config);
3466 #ifdef FEATURE_GRACEFUL_TERMINATION
3467 while (!g_terminate)
3472 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3473 while (waitpid(-1, NULL, WNOHANG) > 0)
3475 /* zombie children */
3477 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3480 * Free data that was used by died threads
3486 * Re-open the errlog after HUP signal
3488 if (received_hup_signal)
3490 init_error_log(Argv[0], config->logfile);
3491 received_hup_signal = 0;
3496 #ifdef FEATURE_COOKIE_JAR
3498 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3499 * already open. I think unload_configfile() is not being run, which should do
3500 * this work. Until that can get resolved, we'll use this workaround.
3504 if (csp->config->jar)
3506 fclose(csp->config->jar);
3507 csp->config->jar = NULL;
3509 #endif /* FEATURE_COOKIE_JAR */
3510 #endif /* __OS2__ */
3512 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3514 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3518 csp->flags |= CSP_FLAG_ACTIVE;
3519 csp->sfd = JB_INVALID_SOCKET;
3521 csp->config = config = load_config();
3523 if ( config->need_bind )
3526 * Since we were listening to the "old port", we will not see
3527 * a "listen" param change until the next IJB request. So, at
3528 * least 1 more request must be made for us to find the new
3529 * setting. I am simply closing the old socket and binding the
3532 * Which-ever is correct, we will serve 1 more page via the
3533 * old settings. This should probably be a "show-proxy-args"
3534 * request. This should not be a so common of an operation
3535 * that this will hurt people's feelings.
3540 bfd = bind_port_helper(config);
3543 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3545 if (!accept_connection(csp, bfd))
3547 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3560 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3563 #ifdef FEATURE_TOGGLE
3564 if (global_toggle_state)
3566 csp->flags |= CSP_FLAG_TOGGLED_ON;
3568 #endif /* def FEATURE_TOGGLE */
3570 if (run_loader(csp))
3572 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3573 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3577 if (block_acl(NULL,csp))
3579 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3580 close_socket(csp->cfd);
3584 #endif /* def FEATURE_ACL */
3586 /* add it to the list of clients */
3587 csp->next = clients->next;
3588 clients->next = csp;
3590 if (config->multi_threaded)
3594 /* this is a switch () statment in the C preprocessor - ugh */
3595 #undef SELECTED_ONE_OPTION
3597 /* Use Pthreads in preference to native code */
3598 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3599 #define SELECTED_ONE_OPTION
3601 pthread_t the_thread;
3602 pthread_attr_t attrs;
3604 pthread_attr_init(&attrs);
3605 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3606 errno = pthread_create(&the_thread, &attrs,
3607 (void * (*)(void *))serve, csp);
3608 child_id = errno ? -1 : 0;
3609 pthread_attr_destroy(&attrs);
3613 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3614 #define SELECTED_ONE_OPTION
3615 child_id = _beginthread(
3616 (void (*)(void *))serve,
3621 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3622 #define SELECTED_ONE_OPTION
3623 child_id = _beginthread(
3624 (void(* _Optlink)(void*))serve,
3630 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3631 #define SELECTED_ONE_OPTION
3633 thread_id tid = spawn_thread
3634 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3636 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3638 child_id = (int) tid;
3647 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3648 #define SELECTED_ONE_OPTION
3649 csp->cfd = ReleaseSocket(csp->cfd, -1);
3652 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3653 NP_Output, Output(),
3654 NP_CloseOutput, FALSE,
3655 NP_Name, (ULONG)"privoxy child",
3659 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3660 NP_Output, Output(),
3661 NP_CloseOutput, FALSE,
3662 NP_Name, (ULONG)"privoxy child",
3663 NP_StackSize, 200*1024,
3669 ((struct Task *)child_id)->tc_UserData = csp;
3670 Signal((struct Task *)child_id, SIGF_SINGLE);
3675 #if !defined(SELECTED_ONE_OPTION)
3678 /* This block is only needed when using fork().
3679 * When using threads, the server thread was
3680 * created and run by the call to _beginthread().
3682 if (child_id == 0) /* child */
3685 #ifdef FEATURE_TOGGLE
3686 int inherited_toggle_state = global_toggle_state;
3687 #endif /* def FEATURE_TOGGLE */
3692 * If we've been toggled or we've blocked the request, tell Mom
3695 #ifdef FEATURE_TOGGLE
3696 if (inherited_toggle_state != global_toggle_state)
3698 rc |= RC_FLAG_TOGGLED;
3700 #endif /* def FEATURE_TOGGLE */
3702 #ifdef FEATURE_STATISTICS
3703 if (csp->flags & CSP_FLAG_REJECTED)
3705 rc |= RC_FLAG_BLOCKED;
3707 #endif /* ndef FEATURE_STATISTICS */
3711 else if (child_id > 0) /* parent */
3713 /* in a fork()'d environment, the parent's
3714 * copy of the client socket and the CSP
3718 #if !defined(_WIN32) && !defined(__CYGWIN__)
3720 wait( &child_status );
3723 * Evaluate child's return code: If the child has
3724 * - been toggled, toggle ourselves
3725 * - blocked its request, bump up the stats counter
3728 #ifdef FEATURE_TOGGLE
3729 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3731 global_toggle_state = !global_toggle_state;
3733 #endif /* def FEATURE_TOGGLE */
3735 #ifdef FEATURE_STATISTICS
3737 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3741 #endif /* def FEATURE_STATISTICS */
3743 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3744 close_socket(csp->cfd);
3745 csp->flags &= ~CSP_FLAG_ACTIVE;
3749 #undef SELECTED_ONE_OPTION
3750 /* end of cpp switch () */
3752 if (child_id < 0) /* failed */
3754 char buf[BUFFER_SIZE];
3756 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3758 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3760 write_socket(csp->cfd, buf, strlen(buf));
3761 close_socket(csp->cfd);
3762 csp->flags &= ~CSP_FLAG_ACTIVE;
3773 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3775 /* Clean up. Aim: free all memory (no leaks) */
3776 #ifdef FEATURE_GRACEFUL_TERMINATION
3778 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3780 unload_current_config_file();
3781 unload_current_actions_file();
3782 unload_current_re_filterfile();
3783 #ifdef FEATURE_TRUST
3784 unload_current_trust_file();
3787 if (config->multi_threaded)
3794 } while ((clients->next != NULL) && (--i > 0));
3798 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3809 #ifdef FEATURE_COOKIE_JAR
3810 if (NULL != config->jar)
3812 fclose(config->jar);
3816 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3817 /* Cleanup - remove taskbar icon etc. */
3822 #endif /* FEATURE_GRACEFUL_TERMINATION */