1 const char jcc_rcs[] = "$Id: jcc.c,v 1.167 2008/02/23 16:57:12 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 1.167 2008/02/23 16:57:12 fabiankeil
37 * Rename url_actions() to get_url_actions() and let it
38 * use the standard parameter ordering.
40 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
41 * Let forward_url() use the standard parameter ordering
42 * and mark its second parameter immutable.
44 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
45 * Remove the "Listening ... for local connections only" log message.
46 * Whether or not remote connections are able to reach Privoxy is up
47 * to the operating system.
49 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
50 * Prevent the log messages for CONNECT requests to unacceptable
51 * ports from printing the limit-connect argument as [null] if
52 * limit-connect hasn't been explicitly enabled.
54 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
55 * Make sure all console-mode apps get a usage() instance
57 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
58 * Reword NO_SERVER_DATA_RESPONSE to make it harder
59 * to misunderstand what the message is all about.
61 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
62 * Unbreak trustfile which previously didn't work without
63 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
65 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
66 * Plug memory leak. Spotted by Valgrind, triggered by
67 * Privoxy-Regression-Test feeding proxyfuzz.py.
69 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
70 * In the HTTP snipplets, refer to the client as client.
72 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
73 * Emit a log message when activating the MS IIS5 hack.
75 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
76 * Log the "weak randomization factor" warning only
77 * once for mingw32 and provide some more details.
79 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
80 * Initialize log module after initializing mutexes, future
81 * deadlocks in that code should now work cross-platform.
83 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
84 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
85 * Reported by Bert van Leeuwen in BR#1818808.
87 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
88 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
90 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
91 * When in daemon mode, close stderr after the configuration file has been
92 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
94 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
95 * - Fix a crash when parsing invalid requests whose first header
96 * is rejected by get_header(). Regression (re?)introduced
97 * in r1.143 by yours truly.
98 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
99 * client_cookie_adder() to make sure send-vanilla-wafer can be
100 * controlled through tags (and thus regression-tested).
102 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
103 * - Move get_filter_function() from jcc.c to filters.c
104 * so the filter functions can be static.
105 * - Don't bother filtering body-less responses.
107 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
108 * Execute content filters through execute_content_filter().
110 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
111 * Initialize req to NULL to make sure it's defined if the
112 * first read_socket() call fails. Reported by icmp30.
114 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
115 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
116 * extensive comments moved to user manual.
118 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
119 * Don't crash if a broken header filter wiped out the request line.
121 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
122 * Fix byte_count calculation in case of flushes
123 * and don't parse the server headers a second time.
125 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
126 * - If there's a connection problem after we already forwarded
127 * parts of the original content, just hang up. Fixes BR#1776724.
128 * - Fix warnings about unused code on mingw32.
129 * - In case of flushes, calculate the byte count
130 * less incorrectly (I think).
132 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
133 * Add some more prototypes for static functions.
135 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
136 * Comment out request_contains_null_bytes() until it's used again.
138 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
139 * #1763173 from Stefan Huehner: s@const static@static const@
140 * and declare some more functions static.
142 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
143 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
144 * and explain why they were rejected in the first place.
145 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
146 * CONNECT requests. The request line was missing.
147 * - Add two more XXX reminders as we don't have enough already.
149 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
150 * As Hal noticed, checking dispatch_cgi() as the last cruncher
151 * looks like a bug if CGI requests are blocked unintentionally,
152 * so don't do it unless the user enabled the new config option
153 * "allow-cgi-request-crunching".
155 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
156 * - Allow to rewrite the request destination behind the client's back.
157 * - Turn the weird-looking unconditional for loop that
158 * reads the client request into a conditional while loop.
159 * Move the stuff that only runs once out of the loop.
160 * - Move parts of chat(), server_content_type() and the
161 * necessary stuff to fix BR#1750917 into get_filter_function().
163 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
164 * Temporary workaround for BR#1730105.
166 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
167 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
168 * deadlocks and crashes on OpenBSD and possibly other OS with neither
169 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
170 * Thanks to Ralf Horstmann for report and solution.
172 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
173 * Add forward-override{} to change the forwarding settings through
174 * action sections. This is mainly interesting to forward different
175 * clients differently (for example based on User-Agent or request
178 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
179 * - Let usage() mention the --chroot parameter.
180 * - Use read_socket() consistently and always leave
181 * the last buffer byte alone, even in cases where
182 * null termination (currently) doesn't matter.
184 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
185 * - Fix config file loading on Unix if no config file is specified.
186 * Since r1.97 Privoxy would always interpret the last argument as
187 * config file, even if it's a valid command line option.
188 * - Abort in case of unrecognized command line options. Closes #1719696.
189 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
190 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
192 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
193 * - Don't rerun crunchers that only depend on the request URL.
194 * - Don't count redirects and CGI requests as "blocked requests".
196 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
197 * Support crunching based on tags created by server-header taggers.
199 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
200 * Make HTTP snippets static (again). Add a Content-Type for those
201 * with content so the browser doesn't guess it based on the URL.
203 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
204 * Move crunching and request line rebuilding out of chat().
206 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
207 * Introduce tags as alternative way to specify which
208 * actions apply to a request. At the moment tags can be
209 * created based on client and server headers.
211 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
212 * Don't CLF-log CONNECT requests twice.
214 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
215 * Log the source address for ACL-related connection drops.
217 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
218 * New config option: enforce-blocks.
220 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
221 * - Move null byte check into separate function.
222 * - Don't confuse the client with error pages
223 * if a CONNECT request was already confirmed.
225 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
226 * Speed up NULL byte escaping and only log the complete
227 * NULL byte requests with header debugging enabled.
229 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
230 * Answer requests that contain NULL bytes with
231 * a custom response instead of waiting for more
232 * data until the client eventually hangs up.
234 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
235 * - Move delivery and logging of crunched responses
236 * from chat() into send_crunch_response().
237 * - Display the reason for generating http_responses.
238 * - Log the content length for LOG_LEVEL_CLF correctly
239 * (still incorrect for some fixed responses).
240 * - Reword an incorrect comment about
241 * treat-forbidden-connects-like-blocks violating
243 * - Add some log messages.
245 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
246 * Move mutex initialization into separate
247 * function and exit in case of errors.
249 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
250 * - Start to reduce chat()'s line count and move
251 * parts of it into separate functions.
252 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
254 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
255 * - Add Proxy-Agent header to HTTP snippets that are
256 * supposed to reach HTTP clients only.
257 * - Made a few CONNECT log messages more descriptive.
258 * - Catch completely empty server responses (as seen
259 * with Tor's fake ".noconnect" top level domain).
260 * - Use shiny new "forwarding-failed" template for socks errors.
262 * Revision 1.118 2007/01/07 07:43:43 joergs
263 * AmigaOS4 support added.
265 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
266 * Added config option accept-intercepted-requests
267 * and disabled it by default.
269 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
270 * Reverted parts of my last commit
271 * to keep error handling working.
273 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
274 * Fixed gcc43 conversion warnings.
276 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
277 * Fix -pedantic ISO C warning about converting
278 * from function pointer to object pointer.
280 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
281 * Silence compiler warning I introduced with my last commit.
283 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
284 * Mutex protect rand() if POSIX threading
285 * is used, warn the user if that's not possible
286 * and stop using it on _WIN32 where it could
289 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
290 * Don't prevent core dumps by catching SIGABRT.
291 * It's rude and makes debugging unreasonable painful.
293 * Revision 1.110 2006/12/13 14:52:53 etresoft
294 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
296 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
297 * Privoxy is now able to run as intercepting
298 * proxy in combination with any packet filter
299 * that does the port redirection. The destination
300 * is extracted from the "Host:" header which
301 * should be available for nearly all requests.
303 * Moved HTTP snipplets into jcc.c.
304 * Added error message for gopher proxy requests.
306 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
307 * Only unlink the pidfile if it's actually used.
309 * Change order of interception checks to make
310 * it possible to block or redirect requests for
313 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
314 * Make pthread mutex locking more generic. Instead of
315 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
316 * and use mutex locking unless there is an _r function
317 * available. Better safe than sorry.
319 * Fixes "./configure --disable-pthread" and should result
320 * in less threading-related problems on pthread-using platforms,
321 * but it still doesn't fix BR#1122404.
323 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
324 * Move pthread.h inclusion from jcc.c to jcc.h.
325 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
327 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
328 * Don't exit after receiving the second SIGHUP on Solaris.
330 * Fixes BR 1052235, but the same problem may exist on other
331 * systems. Once 3.0.6 is out we should use sigset()
332 * where available and see if it breaks anything.
334 * Revision 1.104 2006/09/23 13:26:38 roro
335 * Replace TABs by spaces in source code.
337 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
338 * Fix +redirect{}. Didn't work with -fast-redirects.
340 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
341 * Respond with 400 and a short text message
342 * if the client tries to use Privoxy as FTP proxy.
344 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
345 * Make number of retries in case of forwarded-connect problems
346 * a config file option (forwarded-connect-retries) and use 0 as
349 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
350 * Set random(3) seed.
352 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
353 * Follow the OpenBSD port's lead and protect the resolve
354 * functions on OpenBSD as well.
356 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
357 * --user fix. Only use the user as group if no group is specified.
358 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
360 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
361 * Windows service (re-)integration
365 * --install[:service_name]
366 * --uninstall[:service_name]
369 * They work as follows:
370 * --install will create a service for you and then terminate.
371 * By default the service name will be "privoxy" (without the quotes).
372 * However you can run multiple services if you wish, just by adding
373 * a colon and then a name (no spaces).
375 * --uninstall follows the exact same rules a --install.
377 * --service is used when the program is executed by the service
378 * control manager, and in normal circumstances would never be
379 * used as a command line argument.
381 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
382 * Windows service integration
384 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
385 * Incorporate Fabian Keil's patch work:
386 http://www.fabiankeil.de/sourcecode/privoxy/
388 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
389 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
390 * with what was really the latest development (the v_3_0_branch branch)
392 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
393 * Thanks to Jindrich Makovicka for a race condition fix for the log
394 * file. The race condition remains for non-pthread implementations.
395 * Reference patch #1175720.
397 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
398 * Add the ability to check jpeg images for invalid
399 * lengths of comment blocks. Defensive strategy
400 * against the exploit:
401 * Microsoft Security Bulletin MS04-028
402 * Buffer Overrun in JPEG Processing (GDI+) Could
403 * Allow Code Execution (833987)
404 * Enabled with +inspect-jpegs in actions files.
406 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
407 * - Fixed usage info for non-unix platforms
408 * - Fixed small cmdline parsing bug
410 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
411 * Diagnostics: Now preserve the returncode of pthread_create
412 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
414 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
415 * No longer ignore SIGCHLD. Fixes bug #769381
417 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
418 * Close jarfile on graceful exit, remove stray line
420 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
421 * Cosmetics: Killed a warning, a typo and an allocation left at exit
423 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
424 * No longer rely on non-POSIX.1 extensions of getcwd().
427 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
428 * Replaced setenv() by posix-compliant putenv()
429 * Thanks to Neil McCalden (nmcc AT users.sf.net).
431 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
432 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
434 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
435 * Clean-up and extension of improvements for forked mode:
436 * - Child's return code now consists of flags RC_FLAG_*
437 * - Reporting toggle to parent now properly #ifdef'ed
438 * - Children now report blocking to parent. This enables
439 * statistics in forked mode
441 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
442 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
443 * Children now report having been toggled through _exit(17), parents
444 * watch for that code and toggle themselves if found.
446 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
447 * Wrapping all *_r functions (the non-_r versions of them) with
448 * mutex semaphores for OSX. Hopefully this will take care of all
449 * of those pesky crash reports.
451 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
452 * Fixed two mostly harmless mem leaks
454 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
455 * Fix: Head of global clients list now initialized to NULL
457 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
458 * Added basic support for OPTIONS and TRACE HTTP methods:
459 * - New interceptor direct_response() added in chat().
460 * - sed() moved to earlier in the process, so that the
461 * Host: header is evaluated before actions and forwarding
464 * Revision 1.92 2002/05/08 16:00:46 oes
465 * Chat's buffer handling:
466 * - Fixed bug with unchecked out-of-mem conditions
467 * while reading client request & server headers
468 * - No longer predict if the buffer limit will be exceeded
469 * in the next read -- check add_to_iob's new
470 * return code. If buffer couldn't be extended
471 * (policy or out-of-mem) while
472 * - reading from client: abort
473 * - reading server headers: send error page
474 * - buffering server body for filter: flush,
475 * and if that fails: send error page
477 * Revision 1.91 2002/04/08 20:35:58 swa
480 * Revision 1.90 2002/04/02 14:57:28 oes
481 * Made sending wafers independent of FEATURE_COOKIE_JAR
483 * Revision 1.89 2002/03/31 17:18:59 jongfoster
484 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
486 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
487 * More compiler warning message maintenance
489 * Revision 1.87 2002/03/26 22:29:54 swa
490 * we have a new homepage!
492 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
493 * Workaround for closing the jarfile before load_config() comes around again
495 * Revision 1.85 2002/03/24 15:23:33 jongfoster
498 * Revision 1.84 2002/03/24 13:25:43 swa
499 * name change related issues
501 * Revision 1.83 2002/03/16 23:54:06 jongfoster
502 * Adding graceful termination feature, to help look for memory leaks.
503 * If you enable this (which, by design, has to be done by hand
504 * editing config.h) and then go to http://i.j.b/die, then the program
505 * will exit cleanly after the *next* request. It should free all the
506 * memory that was used.
508 * Revision 1.82 2002/03/13 00:27:05 jongfoster
511 * Revision 1.81 2002/03/12 01:42:50 oes
512 * Introduced modular filters
514 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
515 * OS/2 port maintenance:
516 * - Fixed EMX build - it had decayed a little
517 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
518 * substituted a memset for now.
520 * Revision 1.79 2002/03/09 20:03:52 jongfoster
521 * - Making various functions return int rather than size_t.
522 * (Undoing a recent change). Since size_t is unsigned on
523 * Windows, functions like read_socket that return -1 on
524 * error cannot return a size_t.
526 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
527 * crashes, and also frequently caused JB to jump to 100%
528 * CPU and stay there. (Because it thought it had just
529 * read ((unsigned)-1) == 4Gb of data...)
531 * - The signature of write_socket has changed, it now simply
532 * returns success=0/failure=nonzero.
534 * - Trying to get rid of a few warnings --with-debug on
535 * Windows, I've introduced a new type "jb_socket". This is
536 * used for the socket file descriptors. On Windows, this
537 * is SOCKET (a typedef for unsigned). Everywhere else, it's
538 * an int. The error value can't be -1 any more, so it's
539 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
540 * Windows it maps to the #define INVALID_SOCKET.)
542 * - The signature of bind_port has changed.
544 * Revision 1.78 2002/03/08 21:35:04 oes
545 * Added optional group supplement to --user option. Will now use default group of user if no group given
547 * Revision 1.77 2002/03/07 03:52:06 oes
548 * - Fixed compiler warnings etc
549 * - Improved handling of failed DNS lookups
551 * Revision 1.76 2002/03/06 22:54:35 jongfoster
552 * Automated function-comment nitpicking.
554 * Revision 1.75 2002/03/06 10:02:19 oes
555 * Fixed stupid bug when --user was not given
557 * Revision 1.74 2002/03/06 00:49:31 jongfoster
558 * Fixing warning on Windows
559 * Making #ifdefs that refer to the same variable consistently
560 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
562 * Revision 1.73 2002/03/05 23:57:30 hal9
563 * Stray character 's' on line 1618 was breaking build.
565 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
566 * - Re-enable OS/2 building after new parms were added
567 * - Fix false out of memory report when resolving CGI templates when no IP
568 * address is available of failed attempt (a la no such domain)
570 * Revision 1.71 2002/03/05 18:13:56 oes
571 * Added --user option
573 * Revision 1.70 2002/03/05 04:52:42 oes
574 * Deleted non-errlog debugging code
576 * Revision 1.69 2002/03/04 23:50:00 jongfoster
577 * Splitting off bind_port() call into bind_port_helper(), with
580 * Revision 1.68 2002/03/04 20:17:32 oes
583 * Revision 1.67 2002/03/04 18:18:57 oes
584 * - Removed _DEBUG mode
585 * - Cleand up cmdline parsing
586 * - Introduced --no-daemon, --pidfile options
587 * - Cleaned up signal handling:
588 * - Terminate cleanly on INT, TERM and ABRT
589 * - Schedule logfile for re-opening on HUP
590 * - Ignore CHLD and PIPE
591 * - Leave the rest with their default handlers
592 * - Uniform handler registration
593 * - Added usage() function
594 * - Played styleguide police
596 * Revision 1.66 2002/03/03 15:06:55 oes
597 * Re-enabled automatic config reloading
599 * Revision 1.65 2002/03/03 14:49:11 oes
600 * Fixed CLF logging: Now uses client's original HTTP request
602 * Revision 1.64 2002/03/03 09:18:03 joergs
603 * Made jumbjuster work on AmigaOS again.
605 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
606 * Clean up a little CRLF unpleasantness that suddenly appeared
608 * Revision 1.62 2002/02/20 23:17:23 jongfoster
609 * Detecting some out-of memory conditions and exiting with a log message.
611 * Revision 1.61 2002/01/17 21:01:52 jongfoster
612 * Moving all our URL and URL pattern parsing code to urlmatch.c.
614 * Revision 1.60 2001/12/30 14:07:32 steudten
615 * - Add signal handling (unix)
616 * - Add SIGHUP handler (unix)
617 * - Add creation of pidfile (unix)
618 * - Add action 'top' in rc file (RH)
619 * - Add entry 'SIGNALS' to manpage
620 * - Add exit message to logfile (unix)
622 * Revision 1.59 2001/12/13 14:07:18 oes
623 * Fixed Bug: 503 error page now sent OK
625 * Revision 1.58 2001/11/30 23:37:24 jongfoster
626 * Renaming the Win32 config file to config.txt - this is almost the
627 * same as the corresponding UNIX name "config"
629 * Revision 1.57 2001/11/16 00:47:43 jongfoster
630 * Changing the tty-disconnection code to use setsid().
632 * Revision 1.56 2001/11/13 20:20:54 jongfoster
633 * Tabs->spaces, fixing a bug with missing {} around an if()
635 * Revision 1.55 2001/11/13 20:14:53 jongfoster
636 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
638 * Revision 1.54 2001/11/07 00:03:14 steudten
639 * Give reliable return value if an error
640 * occurs not just 0 with new daemon mode.
642 * Revision 1.53 2001/11/05 21:41:43 steudten
643 * Add changes to be a real daemon just for unix os.
644 * (change cwd to /, detach from controlling tty, set
645 * process group and session leader to the own process.
647 * Add some fatal-error log message for failed malloc().
648 * Add '-d' if compiled with 'configure --with-debug' to
649 * enable debug output.
651 * Revision 1.52 2001/10/26 20:11:20 jongfoster
652 * Fixing type mismatch
654 * Revision 1.51 2001/10/26 17:38:28 oes
657 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
658 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
659 * threads to call select() simultaneously. So, it's time to do a real, live,
660 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
661 * (native). Both versions will work, but using __OS2__ offers multi-threading.
663 * Revision 1.49 2001/10/23 21:41:35 jongfoster
664 * Added call to initialize the (statically-allocated of course)
665 * "out of memory" CGI response.
667 * Revision 1.48 2001/10/10 19:56:46 jongfoster
668 * Moving some code that wasn't cookie-related out of an #ifdef
671 * Revision 1.47 2001/10/10 16:44:36 oes
672 * Added CONNECT destination port limitation check
674 * Revision 1.46 2001/10/08 15:17:41 oes
675 * Re-enabled SSL forwarding
677 * Revision 1.45 2001/10/07 15:42:11 oes
678 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
680 * Moved downgrading of the HTTP version from parse_http_request to
681 * chat(), since we can't decide if it is necessary before we have
682 * determined the actions for the URL. The HTTP command is now
683 * *always* re-built so the repairs need no longer be special-cased.
685 * filter_popups now gets a csp pointer so it can raise the new
686 * CSP_FLAG_MODIFIED flag.
690 * Added configurable size limit for the IOB. If the IOB grows so
691 * large that the next read would exceed the limit, the header
692 * is generated, and the header & unfiltered buffer are flushed
693 * to the client. Chat then continues in non-buffering,
694 * non-filtering body mode.
696 * Revision 1.44 2001/10/02 18:13:57 oes
699 * Revision 1.43 2001/10/02 15:32:13 oes
700 * Moved generation of hdr
702 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
703 * Cleaning up 2 compiler warnings on OS/2.
705 * Revision 1.41 2001/09/16 17:05:14 jongfoster
706 * Removing unused #include showarg.h
708 * Revision 1.40 2001/09/16 15:41:45 jongfoster
709 * Fixing signed/unsigned comparison warning.
711 * Revision 1.39 2001/09/16 13:21:27 jongfoster
712 * Changes to use new list functions.
714 * Revision 1.38 2001/09/16 13:01:46 jongfoster
715 * Removing redundant function call that zeroed zalloc()'d memory.
717 * Revision 1.37 2001/09/10 11:12:24 oes
718 * Deleted unused variable
720 * Revision 1.36 2001/09/10 10:56:15 oes
721 * Silenced compiler warnings
723 * Revision 1.35 2001/07/31 14:44:22 oes
724 * Deleted unused size parameter from filter_popups()
726 * Revision 1.34 2001/07/30 22:08:36 jongfoster
727 * Tidying up #defines:
728 * - All feature #defines are now of the form FEATURE_xxx
729 * - Permanently turned off WIN_GUI_EDIT
730 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
732 * Revision 1.33 2001/07/29 19:32:00 jongfoster
733 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
735 * Revision 1.32 2001/07/29 18:47:05 jongfoster
736 * Adding missing #include "loadcfg.h"
738 * Revision 1.31 2001/07/29 12:17:48 oes
739 * Applied pthread fix by Paul Lieverse
741 * Revision 1.30 2001/07/25 22:57:13 jongfoster
742 * __BEOS__ no longer overrides FEATURE_PTHREAD.
743 * This is because FEATURE_PTHREAD will soon be widely used, so I
744 * want to keep it simple.
746 * Revision 1.29 2001/07/24 12:47:06 oes
747 * Applied BeOS support update by Eugenia
749 * Revision 1.28 2001/07/23 13:26:12 oes
750 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
752 * Revision 1.27 2001/07/19 19:09:47 haroon
753 * - Added code to take care of the situation where while processing the first
754 * server response (which includes the server header), after finding the end
755 * of the headers we were not looking past the end of the headers for
756 * content modification. I enabled it for filter_popups.
757 * Someone else should look to see if other similar operations should be
758 * done to the discarded portion of the buffer.
760 * Note 2001/07/20: No, the other content modification mechanisms will process
761 * the whole iob later anyway. --oes
763 * Revision 1.26 2001/07/18 12:31:36 oes
766 * Revision 1.25 2001/07/15 19:43:49 jongfoster
767 * Supports POSIX threads.
768 * Also removed some unused #includes.
770 * Revision 1.24 2001/07/13 14:00:40 oes
771 * - Generic content modification scheme:
772 * Each feature has its own applicability flag that is set
773 * from csp->action->flags.
774 * Replaced the "filtering" int flag , by a function pointer
775 * "content_filter" to the function that will do the content
776 * modification. If it is != NULL, the document will be buffered
777 * and processed through *content_filter, which must set
778 * csp->content_length and return a modified copy of the body
779 * or return NULL (on failiure).
780 * - Changed csp->is_text to the more generic bitmap csp->content_type
781 * which can currently take the valued CT_TEXT or CT_GIF
783 * - Removed all #ifdef PCRS
785 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
786 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
787 * the `block_acl' call. This prevents a compilation error when the user
788 * does not wish to use the "ACL" feature.
790 * Revision 1.22 2001/06/29 21:45:41 oes
791 * Indentation, CRLF->LF, Tab-> Space
793 * Revision 1.21 2001/06/29 13:29:36 oes
794 * - Cleaned up, improved comments
795 * - Unified all possible interceptors (CGI,
796 * block, trust, fast_redirect) in one
797 * place, with one (CGI) answer generation
798 * mechansim. Much clearer now.
799 * - Removed the GIF image generation, which
800 * is now done in filters.c:block_url()
801 * - Made error conditions like domain lookup
802 * failiure or (various) problems while talking
803 * to the server use cgi.c:error_response()
804 * instead of generating HTML/HTTP in chat() (yuck!)
805 * - Removed logentry from cancelled commit
807 * Revision 1.20 2001/06/09 10:55:28 jongfoster
808 * Changing BUFSIZ ==> BUFFER_SIZE
810 * Revision 1.19 2001/06/07 23:12:52 jongfoster
811 * Replacing function pointer in struct gateway with a directly
812 * called function forwarded_connect().
813 * Replacing struct gateway with struct forward_spec
815 * Revision 1.18 2001/06/03 19:12:16 oes
816 * introduced new cgi handling
818 * Revision 1.17 2001/06/01 20:07:23 jongfoster
819 * Now uses action +image-blocker{} rather than config->tinygif
821 * Revision 1.16 2001/06/01 18:49:17 jongfoster
822 * Replaced "list_share" with "list" - the tiny memory gain was not
823 * worth the extra complexity.
825 * Revision 1.15 2001/05/31 21:24:47 jongfoster
826 * Changed "permission" to "action" throughout.
827 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
828 * Moved vanilla wafer check into chat(), since we must now
829 * decide whether or not to add it based on the URL.
831 * Revision 1.14 2001/05/29 20:14:01 joergs
832 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
835 * Revision 1.13 2001/05/29 09:50:24 jongfoster
836 * Unified blocklist/imagelist/permissionslist.
837 * File format is still under discussion, but the internal changes
840 * Also modified interceptor behaviour:
841 * - We now intercept all URLs beginning with one of the following
842 * prefixes (and *only* these prefixes):
844 * * http://ijbswa.sf.net/config/
845 * * http://ijbswa.sourceforge.net/config/
846 * - New interceptors "home page" - go to http://i.j.b/ to see it.
847 * - Internal changes so that intercepted and fast redirect pages
848 * are not replaced with an image.
849 * - Interceptors now have the option to send a binary page direct
850 * to the client. (i.e. ijb-send-banner uses this)
851 * - Implemented show-url-info interceptor. (Which is why I needed
852 * the above interceptors changes - a typical URL is
853 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
854 * The previous mechanism would not have intercepted that, and
855 * if it had been intercepted then it then it would have replaced
858 * Revision 1.12 2001/05/27 22:17:04 oes
860 * - re_process_buffer no longer writes the modified buffer
861 * to the client, which was very ugly. It now returns the
862 * buffer, which it is then written by chat.
864 * - content_length now adjusts the Content-Length: header
865 * for modified documents rather than crunch()ing it.
866 * (Length info in csp->content_length, which is 0 for
867 * unmodified documents)
869 * - For this to work, sed() is called twice when filtering.
871 * Revision 1.11 2001/05/26 17:27:53 jongfoster
872 * Added support for CLF and fixed LOG_LEVEL_LOG.
873 * Also did CRLF->LF fix of my previous patch.
875 * Revision 1.10 2001/05/26 15:26:15 jongfoster
876 * ACL feature now provides more security by immediately dropping
877 * connections from untrusted hosts.
879 * Revision 1.9 2001/05/26 00:28:36 jongfoster
880 * Automatic reloading of config file.
881 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
882 * Most of the global variables have been moved to a new
883 * struct configuration_spec, accessed through csp->config->globalname
884 * Most of the globals remaining are used by the Win32 GUI.
886 * Revision 1.8 2001/05/25 22:43:18 jongfoster
887 * Fixing minor memory leak and buffer overflow.
889 * Revision 1.7 2001/05/25 22:34:30 jongfoster
892 * Revision 1.6 2001/05/23 00:13:58 joergs
893 * AmigaOS support fixed.
895 * Revision 1.5 2001/05/22 18:46:04 oes
897 * - Enabled filtering banners by size rather than URL
898 * by adding patterns that replace all standard banner
899 * sizes with the "Junkbuster" gif to the re_filterfile
901 * - Enabled filtering WebBugs by providing a pattern
902 * which kills all 1x1 images
904 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
905 * which is selected by the (nonstandard and therefore
906 * capital) letter 'U' in the option string.
907 * It causes the quantifiers to be ungreedy by default.
908 * Appending a ? turns back to greedy (!).
910 * - Added a new interceptor ijb-send-banner, which
911 * sends back the "Junkbuster" gif. Without imagelist or
912 * MSIE detection support, or if tinygif = 1, or the
913 * URL isn't recognized as an imageurl, a lame HTML
914 * explanation is sent instead.
916 * - Added new feature, which permits blocking remote
917 * script redirects and firing back a local redirect
919 * The feature is conditionally compiled, i.e. it
920 * can be disabled with --disable-fast-redirects,
921 * plus it must be activated by a "fast-redirects"
922 * line in the config file, has its own log level
923 * and of course wants to be displayed by show-proxy-args
924 * Note: Boy, all the #ifdefs in 1001 locations and
925 * all the fumbling with configure.in and acconfig.h
926 * were *way* more work than the feature itself :-(
928 * - Because a generic redirect template was needed for
929 * this, tinygif = 3 now uses the same.
931 * - Moved GIFs, and other static HTTP response templates
936 * - Removed some >400 CRs again (Jon, you really worked
939 * Revision 1.4 2001/05/21 19:34:01 jongfoster
940 * Made failure to bind() a fatal error.
942 * Revision 1.3 2001/05/20 01:21:20 jongfoster
943 * Version 2.9.4 checkin.
944 * - Merged popupfile and cookiefile, and added control over PCRS
945 * filtering, in new "permissionsfile".
946 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
947 * file error you now get a message box (in the Win32 GUI) rather
948 * than the program exiting with no explanation.
949 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
951 * - Removed tabs from "config"
952 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
953 * - Bumped up version number.
955 * Revision 1.2 2001/05/17 22:34:44 oes
956 * - Added hint on GIF char array generation to jcc.c
957 * - Cleaned CRLF's from the sources and related files
958 * - Repaired logging for REF and FRC
960 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
961 * Initial import of version 2.9.3 source tree
964 *********************************************************************/
970 #include <sys/types.h>
979 # ifndef FEATURE_PTHREAD
983 # include <windows.h>
984 # include <process.h>
985 # endif /* ndef FEATURE_PTHREAD */
988 # ifndef _WIN_CONSOLE
990 # endif /* ndef _WIN_CONSOLE */
991 # include "w32svrapi.h"
993 #else /* ifndef _WIN32 */
995 # if !defined (__OS2__)
997 # include <sys/wait.h>
998 # endif /* ndef __OS2__ */
999 # include <sys/time.h>
1000 # include <sys/stat.h>
1001 # include <sys/ioctl.h>
1004 #include <sys/termios.h>
1012 # include <signal.h>
1015 # include <socket.h> /* BeOS has select() for sockets only. */
1016 # include <OS.h> /* declarations for threads and stuff. */
1019 # if defined(__EMX__) || defined(__OS2__)
1020 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1025 #define bzero(B,N) memset(B,0x00,n)
1029 # include <select.h>
1034 #include "project.h"
1037 #include "filters.h"
1038 #include "loaders.h"
1039 #include "parsers.h"
1040 #include "killpopup.h"
1041 #include "miscutil.h"
1043 #include "jbsockets.h"
1044 #include "gateway.h"
1045 #include "actions.h"
1047 #include "loadcfg.h"
1048 #include "urlmatch.h"
1050 const char jcc_h_rcs[] = JCC_H_VERSION;
1051 const char project_h_rcs[] = PROJECT_H_VERSION;
1054 struct client_state clients[1];
1055 struct file_list files[1];
1057 #ifdef FEATURE_STATISTICS
1058 int urls_read = 0; /* total nr of urls read inc rejected */
1059 int urls_rejected = 0; /* total nr of urls rejected */
1060 #endif /* def FEATURE_STATISTICS */
1062 #ifdef FEATURE_GRACEFUL_TERMINATION
1063 int g_terminate = 0;
1066 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1067 static void sig_handler(int the_signal);
1069 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1070 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1071 static jb_err get_server_headers(struct client_state *csp);
1072 static const char *crunch_reason(const struct http_response *rsp);
1073 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1075 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1077 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1078 static jb_err change_request_destination(struct client_state *csp);
1079 static void chat(struct client_state *csp);
1080 static void serve(struct client_state *csp);
1081 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1082 static void usage(const char *myname);
1084 static void initialize_mutexes(void);
1085 static jb_socket bind_port_helper(struct configuration_spec *config);
1086 static void listen_loop(void);
1089 void serve(struct client_state *csp);
1090 #else /* ifndef AMIGA */
1091 static void serve(struct client_state *csp);
1092 #endif /* def AMIGA */
1095 static int32 server_thread(void *data);
1096 #endif /* def __BEOS__ */
1099 #define sleep(N) Sleep(((N) * 1000))
1103 #define sleep(N) DosSleep(((N) * 100))
1106 #ifdef FEATURE_PTHREAD
1107 pthread_mutex_t log_mutex;
1108 pthread_mutex_t log_init_mutex;
1110 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1111 pthread_mutex_t resolver_mutex;
1112 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1114 #ifndef HAVE_GMTIME_R
1115 pthread_mutex_t gmtime_mutex;
1116 #endif /* ndef HAVE_GMTIME_R */
1118 #ifndef HAVE_LOCALTIME_R
1119 pthread_mutex_t localtime_mutex;
1120 #endif /* ndef HAVE_GMTIME_R */
1123 pthread_mutex_t rand_mutex;
1124 #endif /* ndef HAVE_RANDOM */
1126 #endif /* FEATURE_PTHREAD */
1128 #if defined(unix) || defined(__EMX__)
1129 const char *basedir = NULL;
1130 const char *pidfile = NULL;
1131 int received_hup_signal = 0;
1132 #endif /* defined unix */
1134 /* HTTP snipplets. */
1135 static const char CSUCCEED[] =
1136 "HTTP/1.0 200 Connection established\r\n"
1137 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1139 static const char CHEADER[] =
1140 "HTTP/1.0 400 Invalid header received from client\r\n"
1141 "Proxy-Agent: Privoxy " VERSION "\r\n"
1142 "Content-Type: text/plain\r\n"
1143 "Connection: close\r\n\r\n"
1144 "Invalid header received from client.\r\n";
1146 static const char CFORBIDDEN[] =
1147 "HTTP/1.0 403 Connection not allowable\r\n"
1148 "Proxy-Agent: Privoxy " VERSION "\r\n"
1149 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1150 "Connection: close\r\n\r\n";
1152 static const char FTP_RESPONSE[] =
1153 "HTTP/1.0 400 Invalid request received from client\r\n"
1154 "Content-Type: text/plain\r\n"
1155 "Connection: close\r\n\r\n"
1156 "Invalid request. Privoxy doesn't support FTP.\r\n";
1158 static const char GOPHER_RESPONSE[] =
1159 "HTTP/1.0 400 Invalid request received from client\r\n"
1160 "Content-Type: text/plain\r\n"
1161 "Connection: close\r\n\r\n"
1162 "Invalid request. Privoxy doesn't support gopher.\r\n";
1164 /* XXX: should be a template */
1165 static const char MISSING_DESTINATION_RESPONSE[] =
1166 "HTTP/1.0 400 Bad request received from client\r\n"
1167 "Proxy-Agent: Privoxy " VERSION "\r\n"
1168 "Content-Type: text/plain\r\n"
1169 "Connection: close\r\n\r\n"
1170 "Bad request. Privoxy was unable to extract the destination.\r\n";
1172 /* XXX: should be a template */
1173 static const char NO_SERVER_DATA_RESPONSE[] =
1174 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1175 "Proxy-Agent: Privoxy " VERSION "\r\n"
1176 "Content-Type: text/plain\r\n"
1177 "Connection: close\r\n\r\n"
1178 "Empty server or forwarder response.\r\n"
1179 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1182 /* XXX: should be a template */
1183 static const char NULL_BYTE_RESPONSE[] =
1184 "HTTP/1.0 400 Bad request received from client\r\n"
1185 "Proxy-Agent: Privoxy " VERSION "\r\n"
1186 "Content-Type: text/plain\r\n"
1187 "Connection: close\r\n\r\n"
1188 "Bad request. Null byte(s) before end of request.\r\n";
1191 /* XXX: should be a template */
1192 static const char MESSED_UP_REQUEST_RESPONSE[] =
1193 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1194 "Proxy-Agent: Privoxy " VERSION "\r\n"
1195 "Content-Type: text/plain\r\n"
1196 "Connection: close\r\n\r\n"
1197 "Bad request. Messed up with header filters.\r\n";
1199 /* A function to crunch a response */
1200 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1202 /* Crunch function flags */
1203 #define CF_NO_FLAGS 0
1204 /* Cruncher applies to forced requests as well */
1205 #define CF_IGNORE_FORCE 1
1206 /* Crunched requests are counted for the block statistics */
1207 #define CF_COUNT_AS_REJECT 2
1209 /* A crunch function and its flags */
1212 const crunch_func_ptr cruncher;
1216 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1218 /* Complete list of cruncher functions */
1219 static const struct cruncher crunchers_all[] = {
1220 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1221 { block_url, CF_COUNT_AS_REJECT },
1222 #ifdef FEATURE_TRUST
1223 { trust_url, CF_COUNT_AS_REJECT },
1224 #endif /* def FEATURE_TRUST */
1225 { redirect_url, CF_NO_FLAGS },
1226 { dispatch_cgi, CF_IGNORE_FORCE},
1230 /* Light version, used after tags are applied */
1231 static const struct cruncher crunchers_light[] = {
1232 { block_url, CF_COUNT_AS_REJECT },
1233 { redirect_url, CF_NO_FLAGS },
1238 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1239 /*********************************************************************
1241 * Function : sig_handler
1243 * Description : Signal handler for different signals.
1244 * Exit gracefully on TERM and INT
1245 * or set a flag that will cause the errlog
1246 * to be reopened by the main thread on HUP.
1249 * 1 : the_signal = the signal cause this function to call
1253 *********************************************************************/
1254 static void sig_handler(int the_signal)
1260 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1271 received_hup_signal = 1;
1276 * We shouldn't be here, unless we catch signals
1277 * in main() that we can't handle here!
1279 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1287 /*********************************************************************
1289 * Function : client_protocol_is_unsupported
1291 * Description : Checks if the client used a known unsupported
1292 * protocol and deals with it by sending an error
1296 * 1 : csp = Current client state (buffers, headers, etc...)
1297 * 2 : req = the first request line send by the client
1299 * Returns : TRUE if an error response has been generated, or
1300 * FALSE if the request doesn't look invalid.
1302 *********************************************************************/
1303 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1305 char buf[BUFFER_SIZE];
1308 * If it's a FTP or gopher request, we don't support it.
1310 * These checks are better than nothing, but they might
1311 * not work in all configurations and some clients might
1312 * have problems digesting the answer.
1314 * They should, however, never cause more problems than
1315 * Privoxy's old behaviour (returning the misleading HTML
1318 * "Could not resolve http://(ftp|gopher)://example.org").
1320 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1322 if (!strncmpic(req, "GET ftp://", 10))
1324 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1325 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1326 csp->ip_addr_str, req);
1330 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1331 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1332 csp->ip_addr_str, req);
1334 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1336 write_socket(csp->cfd, buf, strlen(buf));
1345 /*********************************************************************
1347 * Function : get_request_destination_elsewhere
1349 * Description : If the client's request was redirected into
1350 * Privoxy without the client's knowledge,
1351 * the request line lacks the destination host.
1353 * This function tries to get it elsewhere,
1354 * provided accept-intercepted-requests is enabled.
1356 * "Elsewhere" currently only means "Host: header",
1357 * but in the future we may ask the redirecting
1358 * packet filter to look the destination up.
1360 * If the destination stays unknown, an error
1361 * response is send to the client and headers
1362 * are freed so that chat() can return directly.
1365 * 1 : csp = Current client state (buffers, headers, etc...)
1366 * 2 : headers = a header list
1368 * Returns : JB_ERR_OK if the destination is now known, or
1369 * JB_ERR_PARSE if it isn't.
1371 *********************************************************************/
1372 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1376 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1378 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1379 " Privoxy isn't configured to accept intercepted requests.",
1380 csp->ip_addr_str, csp->http->cmd);
1381 /* XXX: Use correct size */
1382 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1383 csp->ip_addr_str, csp->http->cmd);
1385 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1386 destroy_list(headers);
1388 return JB_ERR_PARSE;
1390 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1392 /* Split the domain we just got for pattern matching */
1393 init_domain_components(csp->http);
1399 /* We can't work without destination. Go spread the news.*/
1401 req = list_to_text(headers);
1403 /* XXX: Use correct size */
1404 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1405 csp->ip_addr_str, csp->http->cmd);
1406 log_error(LOG_LEVEL_ERROR,
1407 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1408 csp->ip_addr_str, csp->http->cmd, req);
1411 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1412 destroy_list(headers);
1414 return JB_ERR_PARSE;
1417 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1418 * to get the destination IP address, use it as host directly
1419 * or do a reverse DNS lookup first.
1424 /*********************************************************************
1426 * Function : get_server_headers
1428 * Description : Parses server headers in iob and fills them
1429 * into csp->headers so that they can later be
1433 * 1 : csp = Current client state (buffers, headers, etc...)
1435 * Returns : JB_ERR_OK if everything went fine, or
1436 * JB_ERR_PARSE if the headers were incomplete.
1438 *********************************************************************/
1439 static jb_err get_server_headers(struct client_state *csp)
1441 int continue_hack_in_da_house = 0;
1444 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1449 * continue hack in da house. Ignore the ending of
1450 * this head and continue enlisting header lines.
1451 * The reason is described below.
1453 enlist(csp->headers, "");
1454 continue_hack_in_da_house = 0;
1457 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1460 * It's a bodyless continue response, don't
1461 * stop header parsing after reaching it's end.
1463 * As a result Privoxy will concatenate the
1464 * next response's head and parse and deliver
1465 * the headers as if they belonged to one request.
1467 * The client will separate them because of the
1468 * empty line between them.
1470 * XXX: What we're doing here is clearly against
1471 * the intended purpose of the continue header,
1472 * and under some conditions (HTTP/1.0 client request)
1473 * it's a standard violation.
1475 * Anyway, "sort of against the spec" is preferable
1476 * to "always getting confused by Continue responses"
1477 * (Privoxy's behaviour before this hack was added)
1479 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1480 continue_hack_in_da_house = 1;
1482 else if (*header == '\0')
1485 * If the header is empty, but the Continue hack
1486 * isn't active, we can assume that we reached the
1487 * end of the buffer before we hit the end of the
1490 * Inform the caller an let it decide how to handle it.
1492 return JB_ERR_PARSE;
1496 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1499 * XXX: Should we quit the request and return a
1500 * out of memory error page instead?
1502 log_error(LOG_LEVEL_ERROR,
1503 "Out of memory while enlisting server headers. %s lost.",
1513 /*********************************************************************
1515 * Function : crunch_reason
1517 * Description : Translates the crunch reason code into a string.
1520 * 1 : rsp = a http_response
1522 * Returns : A string with the crunch reason or an error description.
1524 *********************************************************************/
1525 static const char *crunch_reason(const struct http_response *rsp)
1527 char * reason = NULL;
1529 assert(rsp != NULL);
1532 return "Internal error while searching for crunch reason";
1535 switch (rsp->reason)
1537 case RSP_REASON_UNSUPPORTED:
1538 reason = "Unsupported HTTP feature";
1540 case RSP_REASON_BLOCKED:
1543 case RSP_REASON_UNTRUSTED:
1544 reason = "Untrusted";
1546 case RSP_REASON_REDIRECTED:
1547 reason = "Redirected";
1549 case RSP_REASON_CGI_CALL:
1550 reason = "CGI Call";
1552 case RSP_REASON_NO_SUCH_DOMAIN:
1553 reason = "DNS failure";
1555 case RSP_REASON_FORWARDING_FAILED:
1556 reason = "Forwarding failed";
1558 case RSP_REASON_CONNECT_FAILED:
1559 reason = "Connection failure";
1561 case RSP_REASON_OUT_OF_MEMORY:
1562 reason = "Out of memory (may mask other reasons)";
1565 reason = "No reason recorded";
1573 /*********************************************************************
1575 * Function : send_crunch_response
1577 * Description : Delivers already prepared response for
1578 * intercepted requests, logs the interception
1579 * and frees the response.
1582 * 1 : csp = Current client state (buffers, headers, etc...)
1583 * 1 : rsp = Fully prepared response. Will be freed on exit.
1585 * Returns : Nothing.
1587 *********************************************************************/
1588 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1590 const struct http_request *http = csp->http;
1591 char status_code[4];
1593 assert(rsp != NULL);
1594 assert(rsp->head != NULL);
1599 * Not supposed to happen. If it does
1600 * anyway, treat it as an unknown error.
1602 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1603 /* return code doesn't matter */
1608 /* If rsp is still NULL, we have serious internal problems. */
1609 log_error(LOG_LEVEL_FATAL,
1610 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1614 * Extract the status code from the actual head
1615 * that was send to the client. It is the only
1616 * way to get it right for all requests, including
1617 * the fixed ones for out-of-memory problems.
1619 * A head starts like this: 'HTTP/1.1 200...'
1623 status_code[0] = rsp->head[9];
1624 status_code[1] = rsp->head[10];
1625 status_code[2] = rsp->head[11];
1626 status_code[3] = '\0';
1628 /* Write the answer to the client */
1629 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1630 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1632 /* There is nothing we can do about it. */
1633 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1636 /* Log that the request was crunched and why. */
1637 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1638 http->hostport, http->path, crunch_reason(rsp));
1639 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1640 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1642 /* Clean up and return */
1643 if (cgi_error_memory() != rsp)
1645 free_http_response(rsp);
1652 /*********************************************************************
1654 * Function : request_contains_null_bytes
1656 * Description : Checks for NULL bytes in the request and sends
1657 * an error message to the client if any were found.
1659 * XXX: currently not used, see comment in chat().
1662 * 1 : csp = Current client state (buffers, headers, etc...)
1663 * 2 : buf = Data from the client's request to check.
1664 * 3 : len = The data length.
1666 * Returns : TRUE if the request contained one or more NULL bytes, or
1669 *********************************************************************/
1670 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1672 size_t c_len; /* Request lenght when treated as C string */
1674 c_len = strlen(buf);
1679 * Null byte(s) found. Log the request,
1680 * return an error response and hang up.
1682 size_t tmp_len = c_len;
1687 * Replace NULL byte(s) with '°' characters
1688 * so the request can be logged as string.
1689 * XXX: Is there a better replacement character?
1692 tmp_len += strlen(buf+tmp_len);
1693 } while (tmp_len < len);
1695 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1696 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1697 log_error(LOG_LEVEL_HEADER,
1698 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1700 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1702 /* XXX: Log correct size */
1703 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1713 /*********************************************************************
1715 * Function : crunch_response_triggered
1717 * Description : Checks if the request has to be crunched,
1718 * and delivers the crunch response if necessary.
1721 * 1 : csp = Current client state (buffers, headers, etc...)
1722 * 2 : crunchers = list of cruncher functions to run
1724 * Returns : TRUE if the request was answered with a crunch response
1727 *********************************************************************/
1728 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1730 struct http_response *rsp = NULL;
1731 const struct cruncher *c;
1734 * If CGI request crunching is disabled,
1735 * check the CGI dispatcher out of order to
1736 * prevent unintentional blocks or redirects.
1738 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1739 && (NULL != (rsp = dispatch_cgi(csp))))
1741 /* Deliver, log and free the interception response. */
1742 send_crunch_response(csp, rsp);
1746 for (c = crunchers; c->cruncher != NULL; c++)
1749 * Check the cruncher if either Privoxy is toggled
1750 * on and the request isn't forced, or if the cruncher
1751 * applies to forced requests as well.
1753 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1754 !(csp->flags & CSP_FLAG_FORCED)) ||
1755 (c->flags & CF_IGNORE_FORCE))
1757 rsp = c->cruncher(csp);
1760 /* Deliver, log and free the interception response. */
1761 send_crunch_response(csp, rsp);
1762 #ifdef FEATURE_STATISTICS
1763 if (c->flags & CF_COUNT_AS_REJECT)
1765 csp->flags |= CSP_FLAG_REJECTED;
1767 #endif /* def FEATURE_STATISTICS */
1778 /*********************************************************************
1780 * Function : build_request_line
1782 * Description : Builds the HTTP request line.
1784 * If a HTTP forwarder is used it expects the whole URL,
1785 * web servers only get the path.
1788 * 1 : csp = Current client state (buffers, headers, etc...)
1789 * 2 : fwd = The forwarding spec used for the request
1790 * XXX: Should use http->fwd instead.
1791 * 3 : request_line = The old request line which will be replaced.
1793 * Returns : Nothing. Terminates in case of memory problems.
1795 *********************************************************************/
1796 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1798 struct http_request *http = csp->http;
1800 assert(http->ssl == 0);
1803 * Downgrade http version from 1.1 to 1.0
1804 * if +downgrade action applies.
1806 if ( (csp->action->flags & ACTION_DOWNGRADE)
1807 && (!strcmpic(http->ver, "HTTP/1.1")))
1810 http->ver = strdup("HTTP/1.0");
1812 if (http->ver == NULL)
1814 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1819 * Rebuild the request line.
1821 freez(*request_line);
1822 *request_line = strdup(http->gpc);
1823 string_append(request_line, " ");
1825 if (fwd->forward_host)
1827 string_append(request_line, http->url);
1831 string_append(request_line, http->path);
1833 string_append(request_line, " ");
1834 string_append(request_line, http->ver);
1836 if (*request_line == NULL)
1838 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1840 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1844 /*********************************************************************
1846 * Function : change_request_destination
1848 * Description : Parse a (rewritten) request line and regenerate
1849 * the http request data.
1852 * 1 : csp = Current client state (buffers, headers, etc...)
1854 * Returns : Forwards the parse_http_request() return code.
1855 * Terminates in case of memory problems.
1857 *********************************************************************/
1858 static jb_err change_request_destination(struct client_state *csp)
1860 struct http_request *http = csp->http;
1863 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1864 free_http_request(http);
1865 err = parse_http_request(csp->headers->first->str, http, csp);
1866 if (JB_ERR_OK != err)
1868 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1869 jb_err_to_string(err));
1871 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1872 if (http->ocmd == NULL)
1874 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1881 /*********************************************************************
1885 * Description : Once a connection to the client has been accepted,
1886 * this function is called (via serve()) to handle the
1887 * main business of the communication. When this
1888 * function returns, the caller must close the client
1891 * FIXME: chat is nearly thousand lines long.
1895 * 1 : csp = Current client state (buffers, headers, etc...)
1897 * Returns : Nothing.
1899 *********************************************************************/
1900 static void chat(struct client_state *csp)
1902 char buf[BUFFER_SIZE];
1910 int ms_iis5_hack = 0;
1911 size_t byte_count = 0;
1912 int forwarded_connect_retries = 0;
1913 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1914 const struct forward_spec * fwd;
1915 struct http_request *http;
1916 int len; /* for buffer sizes (and negative error codes) */
1918 #ifdef FEATURE_KILL_POPUPS
1919 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1920 #endif /* def FEATURE_KILL_POPUPS */
1922 /* Function that does the content filtering for the current request */
1923 filter_function_ptr content_filter = NULL;
1925 /* Skeleton for HTTP response, if we should intercept the request */
1926 struct http_response *rsp;
1928 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1929 struct list header_list;
1930 struct list *headers = &header_list;
1934 memset(buf, 0, sizeof(buf));
1937 * Read the client's request. Note that since we're not using select() we
1938 * could get blocked here if a client connected, then didn't say anything!
1943 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1945 if (len <= 0) break; /* error! */
1948 * If there is no memory left for buffering the
1949 * request, there is nothing we can do but hang up
1951 if (add_to_iob(csp, buf, len))
1956 req = get_header(csp);
1958 } while ((NULL != req) && ('\0' == *req));
1960 if ((NULL != req) && ('\0' != *req))
1962 /* Request received. Validate and parse it. */
1966 * XXX: Temporary disabled to prevent problems
1967 * with POST requests whose bodies are allowed to
1968 * contain NULL bytes. BR#1730105.
1970 * The main purpose of this check is to properly
1971 * log stuff like BitTorrent traffic and other junk
1972 * that hits public proxies. It's not required for
1973 * Privoxy to functions as those requests are discarded
1976 * It probably should be rewritten to only check
1977 * the head of the request. Another option would
1978 * be to let all POST requests pass, although that
1979 * may not be good enough.
1981 if (request_contains_null_bytes(csp, buf, len))
1983 /* NULL bytes found and dealt with, just hang up. */
1988 /* Does the request line look invalid? */
1989 if (client_protocol_is_unsupported(csp, req))
1992 * Yes. The request has already been
1993 * answered with a error response, the buffers
1994 * were freed and we're done with chatting.
1999 #ifdef FEATURE_FORCE_LOAD
2001 * If this request contains the FORCE_PREFIX and blocks
2002 * aren't enforced, get rid of it and set the force flag.
2004 if (strstr(req, FORCE_PREFIX))
2006 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2008 log_error(LOG_LEVEL_FORCE,
2009 "Ignored force prefix in request: \"%s\".", req);
2013 strclean(req, FORCE_PREFIX);
2014 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2015 csp->flags |= CSP_FLAG_FORCED;
2019 #endif /* def FEATURE_FORCE_LOAD */
2020 err = parse_http_request(req, http, csp);
2021 if (JB_ERR_OK != err)
2023 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2029 if (http->cmd == NULL)
2031 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2032 /* XXX: Use correct size */
2033 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2034 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2036 free_http_request(http);
2040 /* grab the rest of the client's headers */
2044 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2046 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2049 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2050 destroy_list(headers);
2055 * If there is no memory left for buffering the
2056 * request, there is nothing we can do but hang up
2058 if (add_to_iob(csp, buf, len))
2060 destroy_list(headers);
2066 if (p == NULL) break;
2073 if (http->host == NULL)
2076 * If we still don't know the request destination,
2077 * the request is invalid or the client uses
2078 * Privoxy without its knowledge.
2080 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2083 * Our attempts to get the request destination
2084 * elsewhere failed or Privoxy is configured
2085 * to only accept proxy requests.
2087 * An error response has already been send
2088 * and we're done here.
2095 * Determine the actions for this URL
2097 #ifdef FEATURE_TOGGLE
2098 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2100 /* Most compatible set of actions (i.e. none) */
2101 init_current_action(csp->action);
2104 #endif /* ndef FEATURE_TOGGLE */
2106 get_url_actions(csp, http);
2110 * Save a copy of the original request for logging
2112 http->ocmd = strdup(http->cmd);
2114 if (http->ocmd == NULL)
2116 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2119 enlist(csp->headers, http->cmd);
2121 /* Append the previously read headers */
2122 list_append_list_unique(csp->headers, headers);
2123 destroy_list(headers);
2125 err = sed(client_patterns, add_client_headers, csp);
2126 if (JB_ERR_OK != err)
2128 assert(err == JB_ERR_PARSE);
2129 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2131 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2133 /* Check request line for rewrites. */
2134 if ((NULL == csp->headers->first->str)
2135 || (strcmp(http->cmd, csp->headers->first->str) &&
2136 (JB_ERR_OK != change_request_destination(csp))))
2139 * A header filter broke the request line - bail out.
2141 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2142 /* XXX: Use correct size */
2143 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2144 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2146 free_http_request(http);
2150 /* decide how to route the HTTP request */
2151 fwd = forward_url(csp, http);
2154 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2155 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2159 * build the http request to send to the server
2160 * we have to do one of the following:
2162 * create = use the original HTTP request to create a new
2163 * HTTP request that has either the path component
2164 * without the http://domainspec (w/path) or the
2165 * full orininal URL (w/url)
2166 * Note that the path and/or the HTTP version may
2167 * have been altered by now.
2169 * connect = Open a socket to the host:port of the server
2170 * and short-circuit server and client socket.
2172 * pass = Pass the request unchanged if forwarding a CONNECT
2173 * request to a parent proxy. Note that we'll be sending
2174 * the CFAIL message ourselves if connecting to the parent
2175 * fails, but we won't send a CSUCCEED message if it works,
2176 * since that would result in a double message (ours and the
2177 * parent's). After sending the request to the parent, we simply
2180 * here's the matrix:
2183 * +--------+--------+
2185 * 0 | create | connect|
2187 * Forwarding +--------+--------+
2189 * 1 | create | pass |
2191 * +--------+--------+
2197 if (connect_port_is_forbidden(csp))
2199 const char *acceptable_connect_ports =
2200 csp->action->string[ACTION_STRING_LIMIT_CONNECT] ?
2201 csp->action->string[ACTION_STRING_LIMIT_CONNECT] :
2202 "443 (implied default)";
2203 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2206 * The response may confuse some clients,
2207 * but makes unblocking easier.
2209 * XXX: It seems to work with all major browsers,
2210 * so we should consider returning a body by default someday ...
2212 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2213 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2214 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2215 csp->action->flags |= ACTION_BLOCK;
2220 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2221 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2222 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2223 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2224 assert(NULL != csp->http->ocmd);
2225 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2227 list_remove_all(csp->headers);
2229 * XXX: For consistency we might want to log a crunch message here.
2238 freez(csp->headers->first->str);
2239 build_request_line(csp, fwd, &csp->headers->first->str);
2242 hdr = list_to_text(csp->headers);
2245 /* FIXME Should handle error properly */
2246 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2250 * We have a request. Check if one of the crunchers wants it.
2252 if (crunch_response_triggered(csp, crunchers_all))
2255 * Yes. The client got the crunch response
2256 * and we are done here after cleaning up.
2259 list_remove_all(csp->headers);
2265 * The headers can't be removed earlier because
2266 * they were still needed for the referrer check
2267 * in case of CGI crunches.
2269 * XXX: Would it be worth to move the referrer check
2270 * into client_referrer() and set a flag if it's trusted?
2272 list_remove_all(csp->headers);
2274 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2276 if (fwd->forward_host)
2278 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2279 fwd->forward_host, fwd->forward_port, http->hostport);
2283 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2286 /* here we connect to the server, gateway, or the forwarder */
2288 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2289 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2291 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2292 forwarded_connect_retries, http->hostport);
2295 if (csp->sfd == JB_INVALID_SOCKET)
2297 if (fwd->type != SOCKS_NONE)
2300 rsp = error_response(csp, "forwarding-failed", errno);
2302 else if (errno == EINVAL)
2304 rsp = error_response(csp, "no-such-domain", errno);
2308 rsp = error_response(csp, "connect-failed", errno);
2309 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2314 /* Write the answer to the client */
2317 send_crunch_response(csp, rsp);
2324 if (fwd->forward_host || (http->ssl == 0))
2326 /* write the client's (modified) header to the server
2327 * (along with anything else that may be in the buffer)
2330 if (write_socket(csp->sfd, hdr, strlen(hdr))
2331 || (flush_socket(csp->sfd, csp) < 0))
2333 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2336 rsp = error_response(csp, "connect-failed", errno);
2340 send_crunch_response(csp, rsp);
2350 * We're running an SSL tunnel and we're not forwarding,
2351 * so just send the "connect succeeded" message to the
2352 * client, flush the rest, and get out of the way.
2354 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2362 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2364 /* we're finished with the client's header */
2367 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2369 /* pass data between the client and server
2370 * until one or the other shuts down the connection.
2379 * FD_ZERO here seems to point to an errant macro which crashes.
2380 * So do this by hand for now...
2382 memset(&rfds,0x00,sizeof(fd_set));
2386 FD_SET(csp->cfd, &rfds);
2387 FD_SET(csp->sfd, &rfds);
2389 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2393 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2397 /* this is the body of the browser's request
2398 * just read it and write it.
2401 if (FD_ISSET(csp->cfd, &rfds))
2403 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2407 break; /* "game over, man" */
2410 if (write_socket(csp->sfd, buf, (size_t)len))
2412 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2419 * The server wants to talk. It could be the header or the body.
2420 * If `hdr' is null, then it's the header otherwise it's the body.
2421 * FIXME: Does `hdr' really mean `host'? No.
2425 if (FD_ISSET(csp->sfd, &rfds))
2428 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2432 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2434 if (http->ssl && (fwd->forward_host == NULL))
2437 * Just hang up. We already confirmed the client's CONNECT
2438 * request with status code 200 and unencrypted content is
2439 * no longer welcome.
2441 log_error(LOG_LEVEL_ERROR,
2442 "CONNECT already confirmed. Unable to tell the client about the problem.");
2445 else if (byte_count)
2448 * Just hang up. We already transmitted the original headers
2449 * and parts of the original content and therefore missed the
2450 * chance to send an error message (without risking data corruption).
2452 * XXX: we could retry with a fancy range request here.
2454 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2455 "Unable to tell the client about the problem.");
2459 rsp = error_response(csp, "connect-failed", errno);
2463 send_crunch_response(csp, rsp);
2469 /* Add a trailing zero. This lets filter_popups
2470 * use string operations.
2474 #ifdef FEATURE_KILL_POPUPS
2475 /* Filter the popups on this read. */
2476 if (block_popups_now)
2478 filter_popups(buf, csp);
2480 #endif /* def FEATURE_KILL_POPUPS */
2482 /* Normally, this would indicate that we've read
2483 * as much as the server has sent us and we can
2484 * close the client connection. However, Microsoft
2485 * in its wisdom has released IIS/5 with a bug that
2486 * prevents it from sending the trailing \r\n in
2487 * a 302 redirect header (and possibly other headers).
2488 * To work around this if we've haven't parsed
2489 * a full header we'll append a trailing \r\n
2490 * and see if this now generates a valid one.
2492 * This hack shouldn't have any impacts. If we've
2493 * already transmitted the header or if this is a
2494 * SSL connection, then we won't bother with this
2495 * hack. So we only work on partially received
2496 * headers. If we append a \r\n and this still
2497 * doesn't generate a valid header, then we won't
2498 * transmit anything to the client.
2503 if (server_body || http->ssl)
2506 * If we have been buffering up the document,
2507 * now is the time to apply content modification
2508 * and send the result to the client.
2512 p = execute_content_filter(csp, content_filter);
2514 * If the content filter fails, use the original
2515 * buffer and length.
2516 * (see p != NULL ? p : csp->iob->cur below)
2520 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2523 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2525 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2528 hdr = list_to_text(csp->headers);
2531 /* FIXME Should handle error properly */
2532 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2536 * Shouldn't happen because this was the second sed run
2537 * and tags are only created for the first one.
2539 assert(!crunch_response_triggered(csp, crunchers_all));
2541 if (write_socket(csp->cfd, hdr, strlen(hdr))
2542 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2544 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2554 break; /* "game over, man" */
2558 * This is NOT the body, so
2559 * Let's pretend the server just sent us a blank line.
2561 log_error(LOG_LEVEL_INFO,
2562 "Malformerd HTTP headers detected and MS IIS5 hack enabled. "
2563 "Expect an invalid response or even no response at all.");
2564 snprintf(buf, sizeof(buf), "\r\n");
2565 len = (int)strlen(buf);
2568 * Now, let the normal header parsing algorithm below do its
2569 * job. If it fails, we'll exit instead of continuing.
2576 * If this is an SSL connection or we're in the body
2577 * of the server document, just write it to the client,
2578 * unless we need to buffer the body for later content-filtering
2581 if (server_body || http->ssl)
2586 * If there is no memory left for buffering the content, or the buffer limit
2587 * has been reached, switch to non-filtering mode, i.e. make & write the
2588 * header, flush the iob and buf, and get out of the way.
2590 if (add_to_iob(csp, buf, len))
2595 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2597 hdr = list_to_text(csp->headers);
2601 * Memory is too tight to even generate the header.
2602 * Send our static "Out-of-memory" page.
2604 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2605 rsp = cgi_error_memory();
2606 send_crunch_response(csp, rsp);
2610 hdrlen = strlen(hdr);
2612 if (write_socket(csp->cfd, hdr, hdrlen)
2613 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2614 || (write_socket(csp->cfd, buf, (size_t)len)))
2616 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2623 * Reset the byte_count to the amount of bytes
2624 * we just flushed. len will be added a few lines below,
2625 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2627 byte_count = (size_t)flushed;
2629 content_filter = NULL;
2635 if (write_socket(csp->cfd, buf, (size_t)len))
2637 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2641 byte_count += (size_t)len;
2646 /* we're still looking for the end of the
2647 * server's header ... (does that make header
2648 * parsing an "out of body experience" ?
2652 * buffer up the data we just read. If that fails,
2653 * there's little we can do but send our static
2654 * out-of-memory page.
2656 if (add_to_iob(csp, buf, len))
2658 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2659 rsp = cgi_error_memory();
2660 send_crunch_response(csp, rsp);
2665 /* Convert iob into something sed() can digest */
2666 if (JB_ERR_PARSE == get_server_headers(csp))
2670 /* Well, we tried our MS IIS/5
2671 * hack and it didn't work.
2672 * The header is incomplete
2673 * and there isn't anything
2674 * we can do about it.
2680 /* Since we have to wait for
2681 * more from the server before
2682 * we can parse the headers
2683 * we just continue here.
2689 /* Did we actually get anything? */
2690 if (NULL == csp->headers->first)
2692 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2693 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2694 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2695 free_http_request(http);
2699 /* we have now received the entire header.
2700 * filter it and send the result to the client
2702 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2704 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2706 hdr = list_to_text(csp->headers);
2709 /* FIXME Should handle error properly */
2710 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2713 if (crunch_response_triggered(csp, crunchers_light))
2716 * One of the tags created by a server-header
2717 * tagger triggered a crunch. We already
2718 * delivered the crunch response to the client
2719 * and are done here after cleaning up.
2724 /* Buffer and pcrs filter this if appropriate. */
2726 if (!http->ssl) /* We talk plaintext */
2729 #ifdef FEATURE_KILL_POPUPS
2730 /* Start blocking popups if appropriate. */
2731 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2732 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2734 block_popups_now = 1;
2736 * Filter the part of the body that came in the same read
2737 * as the last headers:
2739 filter_popups(csp->iob->cur, csp);
2741 #endif /* def FEATURE_KILL_POPUPS */
2742 content_filter = get_filter_function(csp);
2745 * Only write if we're not buffering for content modification
2747 if (!content_filter)
2749 /* write the server's (modified) header to
2750 * the client (along with anything else that
2751 * may be in the buffer)
2754 if (write_socket(csp->cfd, hdr, strlen(hdr))
2755 || ((len = flush_socket(csp->cfd, csp)) < 0))
2757 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2759 /* the write failed, so don't bother
2760 * mentioning it to the client...
2761 * it probably can't hear us anyway.
2767 byte_count += (size_t)len;
2770 /* we're finished with the server's header */
2775 /* If this was a MS IIS/5 hack then it means
2776 * the server has already closed the
2777 * connection. Nothing more to read. Time
2788 return; /* huh? we should never get here */
2791 if (csp->content_length == 0)
2794 * If Privoxy didn't recalculate the
2795 * Content-Lenght, byte_count is still
2798 csp->content_length = byte_count;
2801 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2802 csp->ip_addr_str, http->ocmd, csp->content_length);
2806 /*********************************************************************
2810 * Description : This is little more than chat. We only "serve" to
2811 * to close any socket that chat may have opened.
2814 * 1 : csp = Current client state (buffers, headers, etc...)
2818 *********************************************************************/
2820 void serve(struct client_state *csp)
2821 #else /* ifndef AMIGA */
2822 static void serve(struct client_state *csp)
2823 #endif /* def AMIGA */
2826 close_socket(csp->cfd);
2828 if (csp->sfd != JB_INVALID_SOCKET)
2830 close_socket(csp->sfd);
2833 csp->flags &= ~CSP_FLAG_ACTIVE;
2839 /*********************************************************************
2841 * Function : server_thread
2843 * Description : We only exist to call `serve' in a threaded environment.
2846 * 1 : data = Current client state (buffers, headers, etc...)
2848 * Returns : Always 0.
2850 *********************************************************************/
2851 static int32 server_thread(void *data)
2853 serve((struct client_state *) data);
2860 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2861 /*********************************************************************
2865 * Description : Print usage info & exit.
2867 * Parameters : Pointer to argv[0] for identifying ourselves
2871 *********************************************************************/
2872 static void usage(const char *myname)
2874 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2878 #endif /* defined(unix) */
2881 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2882 #endif /* defined(unix) */
2883 "[--version] [configfile]\n"
2884 "Aborting\n", myname);
2889 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2892 /*********************************************************************
2894 * Function : initialize_mutexes
2896 * Description : Prepares mutexes if mutex support is available.
2900 * Returns : Void, exits in case of errors.
2902 *********************************************************************/
2903 static void initialize_mutexes(void)
2907 #ifdef FEATURE_PTHREAD
2909 * Prepare global mutex semaphores
2911 err = pthread_mutex_init(&log_mutex, 0);
2913 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2916 * XXX: The assumptions below are a bit naive
2917 * and can cause locks that aren't necessary.
2919 * For example older FreeBSD versions (< 6.x?)
2920 * have no gethostbyname_r, but gethostbyname is
2923 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2924 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2925 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2927 * XXX: should we use a single mutex for
2928 * localtime() and gmtime() as well?
2930 #ifndef HAVE_GMTIME_R
2931 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2932 #endif /* ndef HAVE_GMTIME_R */
2934 #ifndef HAVE_LOCALTIME_R
2935 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2936 #endif /* ndef HAVE_GMTIME_R */
2939 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2940 #endif /* ndef HAVE_RANDOM */
2941 #endif /* FEATURE_PTHREAD */
2944 * TODO: mutex support for mingw32 would be swell.
2949 printf("Fatal error. Mutex initialization failed: %s.\n",
2958 /*********************************************************************
2962 * Description : Load the config file and start the listen loop.
2963 * This function is a lot more *sane* with the `load_config'
2964 * and `listen_loop' functions; although it stills does
2965 * a *little* too much for my taste.
2968 * 1 : argc = Number of parameters (including $0).
2969 * 2 : argv = Array of (char *)'s to the parameters.
2971 * Returns : 1 if : can't open config file, unrecognized directive,
2972 * stats requested in multi-thread mode, can't open the
2973 * log file, can't open the jar file, listen port is invalid,
2974 * any load fails, and can't bind port.
2976 * Else main never returns, the process must be signaled
2977 * to terminate execution. Or, on Windows, use the
2978 * "File", "Exit" menu option.
2980 *********************************************************************/
2982 int real_main(int argc, const char *argv[])
2984 int main(int argc, const char *argv[])
2988 unsigned int random_seed;
2990 struct passwd *pw = NULL;
2991 struct group *grp = NULL;
2994 char *pre_chroot_nslookup_to_load_resolver = NULL;
3001 #if !defined(_WIN32)
3009 * Parse the command line arguments
3011 * XXX: simply printing usage information in case of
3012 * invalid arguments isn't particular user friendly.
3014 while (++argc_pos < argc)
3017 /* Check to see if the service must be installed or uninstalled */
3018 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3020 const char *pName = argv[argc_pos] + 9;
3023 exit( (install_service(pName)) ? 0 : 1 );
3025 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3027 const char *pName = argv[argc_pos] + 11;
3030 exit((uninstall_service(pName)) ? 0 : 1);
3032 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3034 bRunAsService = TRUE;
3035 w32_set_service_cwd();
3036 atexit(w32_service_exit_notify);
3039 #endif /* defined(_WIN32) */
3042 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3044 if (strcmp(argv[argc_pos], "--help") == 0)
3049 else if(strcmp(argv[argc_pos], "--version") == 0)
3051 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3057 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3062 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3064 if (++argc_pos == argc) usage(argv[0]);
3065 pidfile = strdup(argv[argc_pos]);
3068 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3070 if (++argc_pos == argc) usage(argv[argc_pos]);
3072 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3075 if (NULL == (grp = getgrnam(p)))
3077 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3081 if (NULL == (pw = getpwnam(argv[argc_pos])))
3083 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3086 if (p != NULL) *--p = '\0';
3089 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3091 if (++argc_pos == argc) usage(argv[0]);
3092 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3095 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3099 #endif /* defined(unix) */
3101 else if (argc_pos + 1 != argc)
3104 * This is neither the last command line
3105 * option, nor was it recognized before,
3106 * therefore it must be invalid.
3112 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3114 configfile = argv[argc_pos];
3117 } /* -END- while (more arguments) */
3120 if ( *configfile != '/' )
3122 char cwd[BUFFER_SIZE];
3124 size_t abs_file_size;
3126 /* make config-filename absolute here */
3127 if (NULL == getcwd(cwd, sizeof(cwd)))
3129 perror("failed to get current working directory");
3134 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3135 basedir = strdup(cwd);
3137 if (NULL == basedir ||
3138 NULL == (abs_file = malloc(abs_file_size)))
3140 perror("malloc failed");
3143 strlcpy(abs_file, basedir, abs_file_size);
3144 strlcat(abs_file, "/", abs_file_size );
3145 strlcat(abs_file, configfile, abs_file_size);
3146 configfile = abs_file;
3148 #endif /* defined unix */
3152 clients->next = NULL;
3154 /* XXX: factor out initialising after the next stable release. */
3157 #elif defined(_WIN32)
3161 /* Prepare mutexes if supported and necessary. */
3162 initialize_mutexes();
3164 /* Enable logging until further notice. */
3165 init_log_module(Argv[0]);
3167 random_seed = (unsigned int)time(NULL);
3169 srandom(random_seed);
3170 #elif defined (_WIN32)
3172 * See pick_from_range() in miscutil.c for details.
3174 log_error(LOG_LEVEL_INFO,
3175 "No thread-safe PRNG implemented for your platform. "
3176 "Using weak \'randomization\' factor which will "
3177 "limit the already questionable usefulness of "
3178 "header-time-randomizing actions (disabled by default).");
3181 #endif /* ifdef HAVE_RANDOM */
3184 * Unix signal handling
3186 * Catch the abort, interrupt and terminate signals for a graceful exit
3187 * Catch the hangup signal so the errlog can be reopened.
3188 * Ignore the broken pipe signals (FIXME: Why?)
3190 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3193 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3194 const int ignored_signals[] = { SIGPIPE, 0 };
3196 for (idx = 0; catched_signals[idx] != 0; idx++)
3198 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3199 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3201 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3202 #endif /* ifdef sun */
3204 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3208 for (idx = 0; ignored_signals[idx] != 0; idx++)
3210 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3212 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3217 #else /* ifdef _WIN32 */
3218 # ifdef _WIN_CONSOLE
3220 * We *are* in a windows console app.
3221 * Print a verbose messages about FAQ's and such
3223 printf("%s", win32_blurb);
3224 # endif /* def _WIN_CONSOLE */
3225 #endif /* def _WIN32 */
3228 /* Initialize the CGI subsystem */
3229 cgi_init_error_messages();
3232 * If runnig on unix and without the --nodaemon
3233 * option, become a daemon. I.e. fork, detach
3234 * from tty and get process group leadership
3247 if ( pid < 0 ) /* error */
3252 else if ( pid != 0 ) /* parent */
3257 * must check for errors
3258 * child died due to missing files aso
3261 wpid = waitpid( pid, &status, WNOHANG );
3270 /* Should be more portable, but not as well tested */
3275 #else /* ndef __FreeBSD__ */
3277 #endif /* ndef __FreeBSD__ */
3278 fd = open("/dev/tty", O_RDONLY);
3281 /* no error check here */
3282 ioctl( fd, TIOCNOTTY,0 );
3287 * stderr (fd 2) will be closed later on, when the
3288 * log file has been parsed.
3295 } /* -END- if (!no_daemon) */
3298 * As soon as we have written the PID file, we can switch
3299 * to the user and group ID indicated by the --user option
3305 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3307 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3313 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3315 /* Read the time zone file from /etc before doing chroot. */
3317 if (NULL != pre_chroot_nslookup_to_load_resolver
3318 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3320 /* Initialize resolver library. */
3321 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3323 if (chroot(pw->pw_dir) < 0)
3325 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3329 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3332 if (setuid(pw->pw_uid))
3334 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3338 char putenv_dummy[64];
3340 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3341 if (putenv(putenv_dummy) != 0)
3343 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3346 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3347 if (putenv(putenv_dummy) != 0)
3349 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3355 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3358 #endif /* defined unix */
3361 /* This will be FALSE unless the command line specified --service
3365 /* Yup, so now we must attempt to establish a connection
3366 * with the service dispatcher. This will only work if this
3367 * process was launched by the service control manager to
3368 * actually run as a service. If this isn't the case, i've
3369 * known it take around 30 seconds or so for the call to return.
3372 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3373 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3375 /* Service has run, and at this point is now being stopped, so just return */
3380 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3382 /* An error occurred. Usually it's because --service was wrongly specified
3383 * and we were unable to connect to the Service Control Dispatcher because
3384 * it wasn't expecting us and is therefore not listening.
3386 * For now, just continue below to call the listen_loop function.
3389 #endif /* def _WIN32 */
3399 /*********************************************************************
3401 * Function : bind_port_helper
3403 * Description : Bind the listen port. Handles logging, and aborts
3407 * 1 : config = Privoxy configuration. Specifies port
3410 * Returns : Port that was opened.
3412 *********************************************************************/
3413 static jb_socket bind_port_helper(struct configuration_spec * config)
3418 if (config->haddr == NULL)
3420 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3425 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3426 config->hport, config->haddr);
3429 result = bind_port(config->haddr, config->hport, &bfd);
3436 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3437 "There may be another Privoxy or some other "
3438 "proxy running on port %d",
3439 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3440 config->hport, config->hport);
3443 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3444 "The hostname is not resolvable",
3445 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3448 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3449 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3452 /* shouldn't get here */
3453 return JB_INVALID_SOCKET;
3456 config->need_bind = 0;
3463 /* Without this simple workaround we get this compiler warning from _beginthread
3464 * warning C4028: formal parameter 1 different from declaration
3466 void w32_service_listen_loop(void *p)
3470 #endif /* def _WIN32 */
3473 /*********************************************************************
3475 * Function : listen_loop
3477 * Description : bind the listen port and enter a "FOREVER" listening loop.
3483 *********************************************************************/
3484 static void listen_loop(void)
3486 struct client_state *csp = NULL;
3488 struct configuration_spec * config;
3490 config = load_config();
3492 bfd = bind_port_helper(config);
3494 #ifdef FEATURE_GRACEFUL_TERMINATION
3495 while (!g_terminate)
3500 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3501 while (waitpid(-1, NULL, WNOHANG) > 0)
3503 /* zombie children */
3505 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3508 * Free data that was used by died threads
3514 * Re-open the errlog after HUP signal
3516 if (received_hup_signal)
3518 init_error_log(Argv[0], config->logfile);
3519 received_hup_signal = 0;
3524 #ifdef FEATURE_COOKIE_JAR
3526 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3527 * already open. I think unload_configfile() is not being run, which should do
3528 * this work. Until that can get resolved, we'll use this workaround.
3532 if (csp->config->jar)
3534 fclose(csp->config->jar);
3535 csp->config->jar = NULL;
3537 #endif /* FEATURE_COOKIE_JAR */
3538 #endif /* __OS2__ */
3540 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3542 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3546 csp->flags |= CSP_FLAG_ACTIVE;
3547 csp->sfd = JB_INVALID_SOCKET;
3549 csp->config = config = load_config();
3551 if ( config->need_bind )
3554 * Since we were listening to the "old port", we will not see
3555 * a "listen" param change until the next IJB request. So, at
3556 * least 1 more request must be made for us to find the new
3557 * setting. I am simply closing the old socket and binding the
3560 * Which-ever is correct, we will serve 1 more page via the
3561 * old settings. This should probably be a "show-proxy-args"
3562 * request. This should not be a so common of an operation
3563 * that this will hurt people's feelings.
3568 bfd = bind_port_helper(config);
3571 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3573 if (!accept_connection(csp, bfd))
3575 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3588 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3591 #ifdef FEATURE_TOGGLE
3592 if (global_toggle_state)
3593 #endif /* def FEATURE_TOGGLE */
3595 csp->flags |= CSP_FLAG_TOGGLED_ON;
3598 if (run_loader(csp))
3600 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3601 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3605 if (block_acl(NULL,csp))
3607 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3608 close_socket(csp->cfd);
3612 #endif /* def FEATURE_ACL */
3614 /* add it to the list of clients */
3615 csp->next = clients->next;
3616 clients->next = csp;
3618 if (config->multi_threaded)
3622 /* this is a switch () statment in the C preprocessor - ugh */
3623 #undef SELECTED_ONE_OPTION
3625 /* Use Pthreads in preference to native code */
3626 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3627 #define SELECTED_ONE_OPTION
3629 pthread_t the_thread;
3630 pthread_attr_t attrs;
3632 pthread_attr_init(&attrs);
3633 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3634 errno = pthread_create(&the_thread, &attrs,
3635 (void * (*)(void *))serve, csp);
3636 child_id = errno ? -1 : 0;
3637 pthread_attr_destroy(&attrs);
3641 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3642 #define SELECTED_ONE_OPTION
3643 child_id = _beginthread(
3644 (void (*)(void *))serve,
3649 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3650 #define SELECTED_ONE_OPTION
3651 child_id = _beginthread(
3652 (void(* _Optlink)(void*))serve,
3658 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3659 #define SELECTED_ONE_OPTION
3661 thread_id tid = spawn_thread
3662 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3664 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3666 child_id = (int) tid;
3675 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3676 #define SELECTED_ONE_OPTION
3677 csp->cfd = ReleaseSocket(csp->cfd, -1);
3680 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3681 NP_Output, Output(),
3682 NP_CloseOutput, FALSE,
3683 NP_Name, (ULONG)"privoxy child",
3687 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3688 NP_Output, Output(),
3689 NP_CloseOutput, FALSE,
3690 NP_Name, (ULONG)"privoxy child",
3691 NP_StackSize, 200*1024,
3697 ((struct Task *)child_id)->tc_UserData = csp;
3698 Signal((struct Task *)child_id, SIGF_SINGLE);
3703 #if !defined(SELECTED_ONE_OPTION)
3706 /* This block is only needed when using fork().
3707 * When using threads, the server thread was
3708 * created and run by the call to _beginthread().
3710 if (child_id == 0) /* child */
3713 #ifdef FEATURE_TOGGLE
3714 int inherited_toggle_state = global_toggle_state;
3715 #endif /* def FEATURE_TOGGLE */
3720 * If we've been toggled or we've blocked the request, tell Mom
3723 #ifdef FEATURE_TOGGLE
3724 if (inherited_toggle_state != global_toggle_state)
3726 rc |= RC_FLAG_TOGGLED;
3728 #endif /* def FEATURE_TOGGLE */
3730 #ifdef FEATURE_STATISTICS
3731 if (csp->flags & CSP_FLAG_REJECTED)
3733 rc |= RC_FLAG_BLOCKED;
3735 #endif /* ndef FEATURE_STATISTICS */
3739 else if (child_id > 0) /* parent */
3741 /* in a fork()'d environment, the parent's
3742 * copy of the client socket and the CSP
3746 #if !defined(_WIN32) && !defined(__CYGWIN__)
3748 wait( &child_status );
3751 * Evaluate child's return code: If the child has
3752 * - been toggled, toggle ourselves
3753 * - blocked its request, bump up the stats counter
3756 #ifdef FEATURE_TOGGLE
3757 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3759 global_toggle_state = !global_toggle_state;
3761 #endif /* def FEATURE_TOGGLE */
3763 #ifdef FEATURE_STATISTICS
3765 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3769 #endif /* def FEATURE_STATISTICS */
3771 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3772 close_socket(csp->cfd);
3773 csp->flags &= ~CSP_FLAG_ACTIVE;
3777 #undef SELECTED_ONE_OPTION
3778 /* end of cpp switch () */
3780 if (child_id < 0) /* failed */
3782 char buf[BUFFER_SIZE];
3784 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3786 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3788 write_socket(csp->cfd, buf, strlen(buf));
3789 close_socket(csp->cfd);
3790 csp->flags &= ~CSP_FLAG_ACTIVE;
3801 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3803 /* Clean up. Aim: free all memory (no leaks) */
3804 #ifdef FEATURE_GRACEFUL_TERMINATION
3806 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3808 unload_current_config_file();
3809 unload_current_actions_file();
3810 unload_current_re_filterfile();
3811 #ifdef FEATURE_TRUST
3812 unload_current_trust_file();
3815 if (config->multi_threaded)
3822 } while ((clients->next != NULL) && (--i > 0));
3826 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3837 #ifdef FEATURE_COOKIE_JAR
3838 if (NULL != config->jar)
3840 fclose(config->jar);
3844 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3845 /* Cleanup - remove taskbar icon etc. */
3850 #endif /* FEATURE_GRACEFUL_TERMINATION */