1 const char jcc_rcs[] = "$Id: jcc.c,v 1.163 2007/12/13 01:47:11 david__schmidt 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 1.163 2007/12/13 01:47:11 david__schmidt
37 * Make sure all console-mode apps get a usage() instance
39 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
40 * Reword NO_SERVER_DATA_RESPONSE to make it harder
41 * to misunderstand what the message is all about.
43 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
44 * Unbreak trustfile which previously didn't work without
45 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
47 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
48 * Plug memory leak. Spotted by Valgrind, triggered by
49 * Privoxy-Regression-Test feeding proxyfuzz.py.
51 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
52 * In the HTTP snipplets, refer to the client as client.
54 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
55 * Emit a log message when activating the MS IIS5 hack.
57 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
58 * Log the "weak randomization factor" warning only
59 * once for mingw32 and provide some more details.
61 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
62 * Initialize log module after initializing mutexes, future
63 * deadlocks in that code should now work cross-platform.
65 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
66 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
67 * Reported by Bert van Leeuwen in BR#1818808.
69 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
70 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
72 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
73 * When in daemon mode, close stderr after the configuration file has been
74 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
76 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
77 * - Fix a crash when parsing invalid requests whose first header
78 * is rejected by get_header(). Regression (re?)introduced
79 * in r1.143 by yours truly.
80 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
81 * client_cookie_adder() to make sure send-vanilla-wafer can be
82 * controlled through tags (and thus regression-tested).
84 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
85 * - Move get_filter_function() from jcc.c to filters.c
86 * so the filter functions can be static.
87 * - Don't bother filtering body-less responses.
89 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
90 * Execute content filters through execute_content_filter().
92 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
93 * Initialize req to NULL to make sure it's defined if the
94 * first read_socket() call fails. Reported by icmp30.
96 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
97 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
98 * extensive comments moved to user manual.
100 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
101 * Don't crash if a broken header filter wiped out the request line.
103 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
104 * Fix byte_count calculation in case of flushes
105 * and don't parse the server headers a second time.
107 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
108 * - If there's a connection problem after we already forwarded
109 * parts of the original content, just hang up. Fixes BR#1776724.
110 * - Fix warnings about unused code on mingw32.
111 * - In case of flushes, calculate the byte count
112 * less incorrectly (I think).
114 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
115 * Add some more prototypes for static functions.
117 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
118 * Comment out request_contains_null_bytes() until it's used again.
120 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
121 * #1763173 from Stefan Huehner: s@const static@static const@
122 * and declare some more functions static.
124 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
125 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
126 * and explain why they were rejected in the first place.
127 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
128 * CONNECT requests. The request line was missing.
129 * - Add two more XXX reminders as we don't have enough already.
131 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
132 * As Hal noticed, checking dispatch_cgi() as the last cruncher
133 * looks like a bug if CGI requests are blocked unintentionally,
134 * so don't do it unless the user enabled the new config option
135 * "allow-cgi-request-crunching".
137 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
138 * - Allow to rewrite the request destination behind the client's back.
139 * - Turn the weird-looking unconditional for loop that
140 * reads the client request into a conditional while loop.
141 * Move the stuff that only runs once out of the loop.
142 * - Move parts of chat(), server_content_type() and the
143 * necessary stuff to fix BR#1750917 into get_filter_function().
145 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
146 * Temporary workaround for BR#1730105.
148 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
149 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
150 * deadlocks and crashes on OpenBSD and possibly other OS with neither
151 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
152 * Thanks to Ralf Horstmann for report and solution.
154 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
155 * Add forward-override{} to change the forwarding settings through
156 * action sections. This is mainly interesting to forward different
157 * clients differently (for example based on User-Agent or request
160 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
161 * - Let usage() mention the --chroot parameter.
162 * - Use read_socket() consistently and always leave
163 * the last buffer byte alone, even in cases where
164 * null termination (currently) doesn't matter.
166 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
167 * - Fix config file loading on Unix if no config file is specified.
168 * Since r1.97 Privoxy would always interpret the last argument as
169 * config file, even if it's a valid command line option.
170 * - Abort in case of unrecognized command line options. Closes #1719696.
171 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
172 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
174 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
175 * - Don't rerun crunchers that only depend on the request URL.
176 * - Don't count redirects and CGI requests as "blocked requests".
178 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
179 * Support crunching based on tags created by server-header taggers.
181 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
182 * Make HTTP snippets static (again). Add a Content-Type for those
183 * with content so the browser doesn't guess it based on the URL.
185 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
186 * Move crunching and request line rebuilding out of chat().
188 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
189 * Introduce tags as alternative way to specify which
190 * actions apply to a request. At the moment tags can be
191 * created based on client and server headers.
193 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
194 * Don't CLF-log CONNECT requests twice.
196 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
197 * Log the source address for ACL-related connection drops.
199 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
200 * New config option: enforce-blocks.
202 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
203 * - Move null byte check into separate function.
204 * - Don't confuse the client with error pages
205 * if a CONNECT request was already confirmed.
207 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
208 * Speed up NULL byte escaping and only log the complete
209 * NULL byte requests with header debugging enabled.
211 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
212 * Answer requests that contain NULL bytes with
213 * a custom response instead of waiting for more
214 * data until the client eventually hangs up.
216 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
217 * - Move delivery and logging of crunched responses
218 * from chat() into send_crunch_response().
219 * - Display the reason for generating http_responses.
220 * - Log the content length for LOG_LEVEL_CLF correctly
221 * (still incorrect for some fixed responses).
222 * - Reword an incorrect comment about
223 * treat-forbidden-connects-like-blocks violating
225 * - Add some log messages.
227 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
228 * Move mutex initialization into separate
229 * function and exit in case of errors.
231 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
232 * - Start to reduce chat()'s line count and move
233 * parts of it into separate functions.
234 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
236 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
237 * - Add Proxy-Agent header to HTTP snippets that are
238 * supposed to reach HTTP clients only.
239 * - Made a few CONNECT log messages more descriptive.
240 * - Catch completely empty server responses (as seen
241 * with Tor's fake ".noconnect" top level domain).
242 * - Use shiny new "forwarding-failed" template for socks errors.
244 * Revision 1.118 2007/01/07 07:43:43 joergs
245 * AmigaOS4 support added.
247 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
248 * Added config option accept-intercepted-requests
249 * and disabled it by default.
251 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
252 * Reverted parts of my last commit
253 * to keep error handling working.
255 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
256 * Fixed gcc43 conversion warnings.
258 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
259 * Fix -pedantic ISO C warning about converting
260 * from function pointer to object pointer.
262 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
263 * Silence compiler warning I introduced with my last commit.
265 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
266 * Mutex protect rand() if POSIX threading
267 * is used, warn the user if that's not possible
268 * and stop using it on _WIN32 where it could
271 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
272 * Don't prevent core dumps by catching SIGABRT.
273 * It's rude and makes debugging unreasonable painful.
275 * Revision 1.110 2006/12/13 14:52:53 etresoft
276 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
278 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
279 * Privoxy is now able to run as intercepting
280 * proxy in combination with any packet filter
281 * that does the port redirection. The destination
282 * is extracted from the "Host:" header which
283 * should be available for nearly all requests.
285 * Moved HTTP snipplets into jcc.c.
286 * Added error message for gopher proxy requests.
288 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
289 * Only unlink the pidfile if it's actually used.
291 * Change order of interception checks to make
292 * it possible to block or redirect requests for
295 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
296 * Make pthread mutex locking more generic. Instead of
297 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
298 * and use mutex locking unless there is an _r function
299 * available. Better safe than sorry.
301 * Fixes "./configure --disable-pthread" and should result
302 * in less threading-related problems on pthread-using platforms,
303 * but it still doesn't fix BR#1122404.
305 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
306 * Move pthread.h inclusion from jcc.c to jcc.h.
307 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
309 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
310 * Don't exit after receiving the second SIGHUP on Solaris.
312 * Fixes BR 1052235, but the same problem may exist on other
313 * systems. Once 3.0.6 is out we should use sigset()
314 * where available and see if it breaks anything.
316 * Revision 1.104 2006/09/23 13:26:38 roro
317 * Replace TABs by spaces in source code.
319 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
320 * Fix +redirect{}. Didn't work with -fast-redirects.
322 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
323 * Respond with 400 and a short text message
324 * if the client tries to use Privoxy as FTP proxy.
326 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
327 * Make number of retries in case of forwarded-connect problems
328 * a config file option (forwarded-connect-retries) and use 0 as
331 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
332 * Set random(3) seed.
334 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
335 * Follow the OpenBSD port's lead and protect the resolve
336 * functions on OpenBSD as well.
338 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
339 * --user fix. Only use the user as group if no group is specified.
340 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
342 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
343 * Windows service (re-)integration
347 * --install[:service_name]
348 * --uninstall[:service_name]
351 * They work as follows:
352 * --install will create a service for you and then terminate.
353 * By default the service name will be "privoxy" (without the quotes).
354 * However you can run multiple services if you wish, just by adding
355 * a colon and then a name (no spaces).
357 * --uninstall follows the exact same rules a --install.
359 * --service is used when the program is executed by the service
360 * control manager, and in normal circumstances would never be
361 * used as a command line argument.
363 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
364 * Windows service integration
366 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
367 * Incorporate Fabian Keil's patch work:
368 http://www.fabiankeil.de/sourcecode/privoxy/
370 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
371 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
372 * with what was really the latest development (the v_3_0_branch branch)
374 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
375 * Thanks to Jindrich Makovicka for a race condition fix for the log
376 * file. The race condition remains for non-pthread implementations.
377 * Reference patch #1175720.
379 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
380 * Add the ability to check jpeg images for invalid
381 * lengths of comment blocks. Defensive strategy
382 * against the exploit:
383 * Microsoft Security Bulletin MS04-028
384 * Buffer Overrun in JPEG Processing (GDI+) Could
385 * Allow Code Execution (833987)
386 * Enabled with +inspect-jpegs in actions files.
388 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
389 * - Fixed usage info for non-unix platforms
390 * - Fixed small cmdline parsing bug
392 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
393 * Diagnostics: Now preserve the returncode of pthread_create
394 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
396 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
397 * No longer ignore SIGCHLD. Fixes bug #769381
399 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
400 * Close jarfile on graceful exit, remove stray line
402 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
403 * Cosmetics: Killed a warning, a typo and an allocation left at exit
405 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
406 * No longer rely on non-POSIX.1 extensions of getcwd().
409 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
410 * Replaced setenv() by posix-compliant putenv()
411 * Thanks to Neil McCalden (nmcc AT users.sf.net).
413 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
414 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
416 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
417 * Clean-up and extension of improvements for forked mode:
418 * - Child's return code now consists of flags RC_FLAG_*
419 * - Reporting toggle to parent now properly #ifdef'ed
420 * - Children now report blocking to parent. This enables
421 * statistics in forked mode
423 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
424 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
425 * Children now report having been toggled through _exit(17), parents
426 * watch for that code and toggle themselves if found.
428 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
429 * Wrapping all *_r functions (the non-_r versions of them) with
430 * mutex semaphores for OSX. Hopefully this will take care of all
431 * of those pesky crash reports.
433 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
434 * Fixed two mostly harmless mem leaks
436 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
437 * Fix: Head of global clients list now initialized to NULL
439 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
440 * Added basic support for OPTIONS and TRACE HTTP methods:
441 * - New interceptor direct_response() added in chat().
442 * - sed() moved to earlier in the process, so that the
443 * Host: header is evaluated before actions and forwarding
446 * Revision 1.92 2002/05/08 16:00:46 oes
447 * Chat's buffer handling:
448 * - Fixed bug with unchecked out-of-mem conditions
449 * while reading client request & server headers
450 * - No longer predict if the buffer limit will be exceeded
451 * in the next read -- check add_to_iob's new
452 * return code. If buffer couldn't be extended
453 * (policy or out-of-mem) while
454 * - reading from client: abort
455 * - reading server headers: send error page
456 * - buffering server body for filter: flush,
457 * and if that fails: send error page
459 * Revision 1.91 2002/04/08 20:35:58 swa
462 * Revision 1.90 2002/04/02 14:57:28 oes
463 * Made sending wafers independent of FEATURE_COOKIE_JAR
465 * Revision 1.89 2002/03/31 17:18:59 jongfoster
466 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
468 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
469 * More compiler warning message maintenance
471 * Revision 1.87 2002/03/26 22:29:54 swa
472 * we have a new homepage!
474 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
475 * Workaround for closing the jarfile before load_config() comes around again
477 * Revision 1.85 2002/03/24 15:23:33 jongfoster
480 * Revision 1.84 2002/03/24 13:25:43 swa
481 * name change related issues
483 * Revision 1.83 2002/03/16 23:54:06 jongfoster
484 * Adding graceful termination feature, to help look for memory leaks.
485 * If you enable this (which, by design, has to be done by hand
486 * editing config.h) and then go to http://i.j.b/die, then the program
487 * will exit cleanly after the *next* request. It should free all the
488 * memory that was used.
490 * Revision 1.82 2002/03/13 00:27:05 jongfoster
493 * Revision 1.81 2002/03/12 01:42:50 oes
494 * Introduced modular filters
496 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
497 * OS/2 port maintenance:
498 * - Fixed EMX build - it had decayed a little
499 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
500 * substituted a memset for now.
502 * Revision 1.79 2002/03/09 20:03:52 jongfoster
503 * - Making various functions return int rather than size_t.
504 * (Undoing a recent change). Since size_t is unsigned on
505 * Windows, functions like read_socket that return -1 on
506 * error cannot return a size_t.
508 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
509 * crashes, and also frequently caused JB to jump to 100%
510 * CPU and stay there. (Because it thought it had just
511 * read ((unsigned)-1) == 4Gb of data...)
513 * - The signature of write_socket has changed, it now simply
514 * returns success=0/failure=nonzero.
516 * - Trying to get rid of a few warnings --with-debug on
517 * Windows, I've introduced a new type "jb_socket". This is
518 * used for the socket file descriptors. On Windows, this
519 * is SOCKET (a typedef for unsigned). Everywhere else, it's
520 * an int. The error value can't be -1 any more, so it's
521 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
522 * Windows it maps to the #define INVALID_SOCKET.)
524 * - The signature of bind_port has changed.
526 * Revision 1.78 2002/03/08 21:35:04 oes
527 * Added optional group supplement to --user option. Will now use default group of user if no group given
529 * Revision 1.77 2002/03/07 03:52:06 oes
530 * - Fixed compiler warnings etc
531 * - Improved handling of failed DNS lookups
533 * Revision 1.76 2002/03/06 22:54:35 jongfoster
534 * Automated function-comment nitpicking.
536 * Revision 1.75 2002/03/06 10:02:19 oes
537 * Fixed stupid bug when --user was not given
539 * Revision 1.74 2002/03/06 00:49:31 jongfoster
540 * Fixing warning on Windows
541 * Making #ifdefs that refer to the same variable consistently
542 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
544 * Revision 1.73 2002/03/05 23:57:30 hal9
545 * Stray character 's' on line 1618 was breaking build.
547 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
548 * - Re-enable OS/2 building after new parms were added
549 * - Fix false out of memory report when resolving CGI templates when no IP
550 * address is available of failed attempt (a la no such domain)
552 * Revision 1.71 2002/03/05 18:13:56 oes
553 * Added --user option
555 * Revision 1.70 2002/03/05 04:52:42 oes
556 * Deleted non-errlog debugging code
558 * Revision 1.69 2002/03/04 23:50:00 jongfoster
559 * Splitting off bind_port() call into bind_port_helper(), with
562 * Revision 1.68 2002/03/04 20:17:32 oes
565 * Revision 1.67 2002/03/04 18:18:57 oes
566 * - Removed _DEBUG mode
567 * - Cleand up cmdline parsing
568 * - Introduced --no-daemon, --pidfile options
569 * - Cleaned up signal handling:
570 * - Terminate cleanly on INT, TERM and ABRT
571 * - Schedule logfile for re-opening on HUP
572 * - Ignore CHLD and PIPE
573 * - Leave the rest with their default handlers
574 * - Uniform handler registration
575 * - Added usage() function
576 * - Played styleguide police
578 * Revision 1.66 2002/03/03 15:06:55 oes
579 * Re-enabled automatic config reloading
581 * Revision 1.65 2002/03/03 14:49:11 oes
582 * Fixed CLF logging: Now uses client's original HTTP request
584 * Revision 1.64 2002/03/03 09:18:03 joergs
585 * Made jumbjuster work on AmigaOS again.
587 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
588 * Clean up a little CRLF unpleasantness that suddenly appeared
590 * Revision 1.62 2002/02/20 23:17:23 jongfoster
591 * Detecting some out-of memory conditions and exiting with a log message.
593 * Revision 1.61 2002/01/17 21:01:52 jongfoster
594 * Moving all our URL and URL pattern parsing code to urlmatch.c.
596 * Revision 1.60 2001/12/30 14:07:32 steudten
597 * - Add signal handling (unix)
598 * - Add SIGHUP handler (unix)
599 * - Add creation of pidfile (unix)
600 * - Add action 'top' in rc file (RH)
601 * - Add entry 'SIGNALS' to manpage
602 * - Add exit message to logfile (unix)
604 * Revision 1.59 2001/12/13 14:07:18 oes
605 * Fixed Bug: 503 error page now sent OK
607 * Revision 1.58 2001/11/30 23:37:24 jongfoster
608 * Renaming the Win32 config file to config.txt - this is almost the
609 * same as the corresponding UNIX name "config"
611 * Revision 1.57 2001/11/16 00:47:43 jongfoster
612 * Changing the tty-disconnection code to use setsid().
614 * Revision 1.56 2001/11/13 20:20:54 jongfoster
615 * Tabs->spaces, fixing a bug with missing {} around an if()
617 * Revision 1.55 2001/11/13 20:14:53 jongfoster
618 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
620 * Revision 1.54 2001/11/07 00:03:14 steudten
621 * Give reliable return value if an error
622 * occurs not just 0 with new daemon mode.
624 * Revision 1.53 2001/11/05 21:41:43 steudten
625 * Add changes to be a real daemon just for unix os.
626 * (change cwd to /, detach from controlling tty, set
627 * process group and session leader to the own process.
629 * Add some fatal-error log message for failed malloc().
630 * Add '-d' if compiled with 'configure --with-debug' to
631 * enable debug output.
633 * Revision 1.52 2001/10/26 20:11:20 jongfoster
634 * Fixing type mismatch
636 * Revision 1.51 2001/10/26 17:38:28 oes
639 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
640 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
641 * threads to call select() simultaneously. So, it's time to do a real, live,
642 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
643 * (native). Both versions will work, but using __OS2__ offers multi-threading.
645 * Revision 1.49 2001/10/23 21:41:35 jongfoster
646 * Added call to initialize the (statically-allocated of course)
647 * "out of memory" CGI response.
649 * Revision 1.48 2001/10/10 19:56:46 jongfoster
650 * Moving some code that wasn't cookie-related out of an #ifdef
653 * Revision 1.47 2001/10/10 16:44:36 oes
654 * Added CONNECT destination port limitation check
656 * Revision 1.46 2001/10/08 15:17:41 oes
657 * Re-enabled SSL forwarding
659 * Revision 1.45 2001/10/07 15:42:11 oes
660 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
662 * Moved downgrading of the HTTP version from parse_http_request to
663 * chat(), since we can't decide if it is necessary before we have
664 * determined the actions for the URL. The HTTP command is now
665 * *always* re-built so the repairs need no longer be special-cased.
667 * filter_popups now gets a csp pointer so it can raise the new
668 * CSP_FLAG_MODIFIED flag.
672 * Added configurable size limit for the IOB. If the IOB grows so
673 * large that the next read would exceed the limit, the header
674 * is generated, and the header & unfiltered buffer are flushed
675 * to the client. Chat then continues in non-buffering,
676 * non-filtering body mode.
678 * Revision 1.44 2001/10/02 18:13:57 oes
681 * Revision 1.43 2001/10/02 15:32:13 oes
682 * Moved generation of hdr
684 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
685 * Cleaning up 2 compiler warnings on OS/2.
687 * Revision 1.41 2001/09/16 17:05:14 jongfoster
688 * Removing unused #include showarg.h
690 * Revision 1.40 2001/09/16 15:41:45 jongfoster
691 * Fixing signed/unsigned comparison warning.
693 * Revision 1.39 2001/09/16 13:21:27 jongfoster
694 * Changes to use new list functions.
696 * Revision 1.38 2001/09/16 13:01:46 jongfoster
697 * Removing redundant function call that zeroed zalloc()'d memory.
699 * Revision 1.37 2001/09/10 11:12:24 oes
700 * Deleted unused variable
702 * Revision 1.36 2001/09/10 10:56:15 oes
703 * Silenced compiler warnings
705 * Revision 1.35 2001/07/31 14:44:22 oes
706 * Deleted unused size parameter from filter_popups()
708 * Revision 1.34 2001/07/30 22:08:36 jongfoster
709 * Tidying up #defines:
710 * - All feature #defines are now of the form FEATURE_xxx
711 * - Permanently turned off WIN_GUI_EDIT
712 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
714 * Revision 1.33 2001/07/29 19:32:00 jongfoster
715 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
717 * Revision 1.32 2001/07/29 18:47:05 jongfoster
718 * Adding missing #include "loadcfg.h"
720 * Revision 1.31 2001/07/29 12:17:48 oes
721 * Applied pthread fix by Paul Lieverse
723 * Revision 1.30 2001/07/25 22:57:13 jongfoster
724 * __BEOS__ no longer overrides FEATURE_PTHREAD.
725 * This is because FEATURE_PTHREAD will soon be widely used, so I
726 * want to keep it simple.
728 * Revision 1.29 2001/07/24 12:47:06 oes
729 * Applied BeOS support update by Eugenia
731 * Revision 1.28 2001/07/23 13:26:12 oes
732 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
734 * Revision 1.27 2001/07/19 19:09:47 haroon
735 * - Added code to take care of the situation where while processing the first
736 * server response (which includes the server header), after finding the end
737 * of the headers we were not looking past the end of the headers for
738 * content modification. I enabled it for filter_popups.
739 * Someone else should look to see if other similar operations should be
740 * done to the discarded portion of the buffer.
742 * Note 2001/07/20: No, the other content modification mechanisms will process
743 * the whole iob later anyway. --oes
745 * Revision 1.26 2001/07/18 12:31:36 oes
748 * Revision 1.25 2001/07/15 19:43:49 jongfoster
749 * Supports POSIX threads.
750 * Also removed some unused #includes.
752 * Revision 1.24 2001/07/13 14:00:40 oes
753 * - Generic content modification scheme:
754 * Each feature has its own applicability flag that is set
755 * from csp->action->flags.
756 * Replaced the "filtering" int flag , by a function pointer
757 * "content_filter" to the function that will do the content
758 * modification. If it is != NULL, the document will be buffered
759 * and processed through *content_filter, which must set
760 * csp->content_length and return a modified copy of the body
761 * or return NULL (on failiure).
762 * - Changed csp->is_text to the more generic bitmap csp->content_type
763 * which can currently take the valued CT_TEXT or CT_GIF
765 * - Removed all #ifdef PCRS
767 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
768 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
769 * the `block_acl' call. This prevents a compilation error when the user
770 * does not wish to use the "ACL" feature.
772 * Revision 1.22 2001/06/29 21:45:41 oes
773 * Indentation, CRLF->LF, Tab-> Space
775 * Revision 1.21 2001/06/29 13:29:36 oes
776 * - Cleaned up, improved comments
777 * - Unified all possible interceptors (CGI,
778 * block, trust, fast_redirect) in one
779 * place, with one (CGI) answer generation
780 * mechansim. Much clearer now.
781 * - Removed the GIF image generation, which
782 * is now done in filters.c:block_url()
783 * - Made error conditions like domain lookup
784 * failiure or (various) problems while talking
785 * to the server use cgi.c:error_response()
786 * instead of generating HTML/HTTP in chat() (yuck!)
787 * - Removed logentry from cancelled commit
789 * Revision 1.20 2001/06/09 10:55:28 jongfoster
790 * Changing BUFSIZ ==> BUFFER_SIZE
792 * Revision 1.19 2001/06/07 23:12:52 jongfoster
793 * Replacing function pointer in struct gateway with a directly
794 * called function forwarded_connect().
795 * Replacing struct gateway with struct forward_spec
797 * Revision 1.18 2001/06/03 19:12:16 oes
798 * introduced new cgi handling
800 * Revision 1.17 2001/06/01 20:07:23 jongfoster
801 * Now uses action +image-blocker{} rather than config->tinygif
803 * Revision 1.16 2001/06/01 18:49:17 jongfoster
804 * Replaced "list_share" with "list" - the tiny memory gain was not
805 * worth the extra complexity.
807 * Revision 1.15 2001/05/31 21:24:47 jongfoster
808 * Changed "permission" to "action" throughout.
809 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
810 * Moved vanilla wafer check into chat(), since we must now
811 * decide whether or not to add it based on the URL.
813 * Revision 1.14 2001/05/29 20:14:01 joergs
814 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
817 * Revision 1.13 2001/05/29 09:50:24 jongfoster
818 * Unified blocklist/imagelist/permissionslist.
819 * File format is still under discussion, but the internal changes
822 * Also modified interceptor behaviour:
823 * - We now intercept all URLs beginning with one of the following
824 * prefixes (and *only* these prefixes):
826 * * http://ijbswa.sf.net/config/
827 * * http://ijbswa.sourceforge.net/config/
828 * - New interceptors "home page" - go to http://i.j.b/ to see it.
829 * - Internal changes so that intercepted and fast redirect pages
830 * are not replaced with an image.
831 * - Interceptors now have the option to send a binary page direct
832 * to the client. (i.e. ijb-send-banner uses this)
833 * - Implemented show-url-info interceptor. (Which is why I needed
834 * the above interceptors changes - a typical URL is
835 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
836 * The previous mechanism would not have intercepted that, and
837 * if it had been intercepted then it then it would have replaced
840 * Revision 1.12 2001/05/27 22:17:04 oes
842 * - re_process_buffer no longer writes the modified buffer
843 * to the client, which was very ugly. It now returns the
844 * buffer, which it is then written by chat.
846 * - content_length now adjusts the Content-Length: header
847 * for modified documents rather than crunch()ing it.
848 * (Length info in csp->content_length, which is 0 for
849 * unmodified documents)
851 * - For this to work, sed() is called twice when filtering.
853 * Revision 1.11 2001/05/26 17:27:53 jongfoster
854 * Added support for CLF and fixed LOG_LEVEL_LOG.
855 * Also did CRLF->LF fix of my previous patch.
857 * Revision 1.10 2001/05/26 15:26:15 jongfoster
858 * ACL feature now provides more security by immediately dropping
859 * connections from untrusted hosts.
861 * Revision 1.9 2001/05/26 00:28:36 jongfoster
862 * Automatic reloading of config file.
863 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
864 * Most of the global variables have been moved to a new
865 * struct configuration_spec, accessed through csp->config->globalname
866 * Most of the globals remaining are used by the Win32 GUI.
868 * Revision 1.8 2001/05/25 22:43:18 jongfoster
869 * Fixing minor memory leak and buffer overflow.
871 * Revision 1.7 2001/05/25 22:34:30 jongfoster
874 * Revision 1.6 2001/05/23 00:13:58 joergs
875 * AmigaOS support fixed.
877 * Revision 1.5 2001/05/22 18:46:04 oes
879 * - Enabled filtering banners by size rather than URL
880 * by adding patterns that replace all standard banner
881 * sizes with the "Junkbuster" gif to the re_filterfile
883 * - Enabled filtering WebBugs by providing a pattern
884 * which kills all 1x1 images
886 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
887 * which is selected by the (nonstandard and therefore
888 * capital) letter 'U' in the option string.
889 * It causes the quantifiers to be ungreedy by default.
890 * Appending a ? turns back to greedy (!).
892 * - Added a new interceptor ijb-send-banner, which
893 * sends back the "Junkbuster" gif. Without imagelist or
894 * MSIE detection support, or if tinygif = 1, or the
895 * URL isn't recognized as an imageurl, a lame HTML
896 * explanation is sent instead.
898 * - Added new feature, which permits blocking remote
899 * script redirects and firing back a local redirect
901 * The feature is conditionally compiled, i.e. it
902 * can be disabled with --disable-fast-redirects,
903 * plus it must be activated by a "fast-redirects"
904 * line in the config file, has its own log level
905 * and of course wants to be displayed by show-proxy-args
906 * Note: Boy, all the #ifdefs in 1001 locations and
907 * all the fumbling with configure.in and acconfig.h
908 * were *way* more work than the feature itself :-(
910 * - Because a generic redirect template was needed for
911 * this, tinygif = 3 now uses the same.
913 * - Moved GIFs, and other static HTTP response templates
918 * - Removed some >400 CRs again (Jon, you really worked
921 * Revision 1.4 2001/05/21 19:34:01 jongfoster
922 * Made failure to bind() a fatal error.
924 * Revision 1.3 2001/05/20 01:21:20 jongfoster
925 * Version 2.9.4 checkin.
926 * - Merged popupfile and cookiefile, and added control over PCRS
927 * filtering, in new "permissionsfile".
928 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
929 * file error you now get a message box (in the Win32 GUI) rather
930 * than the program exiting with no explanation.
931 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
933 * - Removed tabs from "config"
934 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
935 * - Bumped up version number.
937 * Revision 1.2 2001/05/17 22:34:44 oes
938 * - Added hint on GIF char array generation to jcc.c
939 * - Cleaned CRLF's from the sources and related files
940 * - Repaired logging for REF and FRC
942 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
943 * Initial import of version 2.9.3 source tree
946 *********************************************************************/
952 #include <sys/types.h>
961 # ifndef FEATURE_PTHREAD
965 # include <windows.h>
966 # include <process.h>
967 # endif /* ndef FEATURE_PTHREAD */
970 # ifndef _WIN_CONSOLE
972 # endif /* ndef _WIN_CONSOLE */
973 # include "w32svrapi.h"
975 #else /* ifndef _WIN32 */
977 # if !defined (__OS2__)
979 # include <sys/wait.h>
980 # endif /* ndef __OS2__ */
981 # include <sys/time.h>
982 # include <sys/stat.h>
983 # include <sys/ioctl.h>
986 #include <sys/termios.h>
997 # include <socket.h> /* BeOS has select() for sockets only. */
998 # include <OS.h> /* declarations for threads and stuff. */
1001 # if defined(__EMX__) || defined(__OS2__)
1002 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1007 #define bzero(B,N) memset(B,0x00,n)
1011 # include <select.h>
1016 #include "project.h"
1019 #include "filters.h"
1020 #include "loaders.h"
1021 #include "parsers.h"
1022 #include "killpopup.h"
1023 #include "miscutil.h"
1025 #include "jbsockets.h"
1026 #include "gateway.h"
1027 #include "actions.h"
1029 #include "loadcfg.h"
1030 #include "urlmatch.h"
1032 const char jcc_h_rcs[] = JCC_H_VERSION;
1033 const char project_h_rcs[] = PROJECT_H_VERSION;
1036 struct client_state clients[1];
1037 struct file_list files[1];
1039 #ifdef FEATURE_STATISTICS
1040 int urls_read = 0; /* total nr of urls read inc rejected */
1041 int urls_rejected = 0; /* total nr of urls rejected */
1042 #endif /* def FEATURE_STATISTICS */
1044 #ifdef FEATURE_GRACEFUL_TERMINATION
1045 int g_terminate = 0;
1048 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1049 static void sig_handler(int the_signal);
1051 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1052 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1053 static jb_err get_server_headers(struct client_state *csp);
1054 static const char *crunch_reason(const struct http_response *rsp);
1055 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1057 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1059 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1060 static jb_err change_request_destination(struct client_state *csp);
1061 static void chat(struct client_state *csp);
1062 static void serve(struct client_state *csp);
1063 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1064 static void usage(const char *myname);
1066 static void initialize_mutexes(void);
1067 static jb_socket bind_port_helper(struct configuration_spec *config);
1068 static void listen_loop(void);
1071 void serve(struct client_state *csp);
1072 #else /* ifndef AMIGA */
1073 static void serve(struct client_state *csp);
1074 #endif /* def AMIGA */
1077 static int32 server_thread(void *data);
1078 #endif /* def __BEOS__ */
1081 #define sleep(N) Sleep(((N) * 1000))
1085 #define sleep(N) DosSleep(((N) * 100))
1088 #ifdef FEATURE_PTHREAD
1089 pthread_mutex_t log_mutex;
1090 pthread_mutex_t log_init_mutex;
1092 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1093 pthread_mutex_t resolver_mutex;
1094 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1096 #ifndef HAVE_GMTIME_R
1097 pthread_mutex_t gmtime_mutex;
1098 #endif /* ndef HAVE_GMTIME_R */
1100 #ifndef HAVE_LOCALTIME_R
1101 pthread_mutex_t localtime_mutex;
1102 #endif /* ndef HAVE_GMTIME_R */
1105 pthread_mutex_t rand_mutex;
1106 #endif /* ndef HAVE_RANDOM */
1108 #endif /* FEATURE_PTHREAD */
1110 #if defined(unix) || defined(__EMX__)
1111 const char *basedir = NULL;
1112 const char *pidfile = NULL;
1113 int received_hup_signal = 0;
1114 #endif /* defined unix */
1116 /* HTTP snipplets. */
1117 static const char CSUCCEED[] =
1118 "HTTP/1.0 200 Connection established\r\n"
1119 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1121 static const char CHEADER[] =
1122 "HTTP/1.0 400 Invalid header received from client\r\n"
1123 "Proxy-Agent: Privoxy " VERSION "\r\n"
1124 "Content-Type: text/plain\r\n"
1125 "Connection: close\r\n\r\n"
1126 "Invalid header received from client.\r\n";
1128 static const char CFORBIDDEN[] =
1129 "HTTP/1.0 403 Connection not allowable\r\n"
1130 "Proxy-Agent: Privoxy " VERSION "\r\n"
1131 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1132 "Connection: close\r\n\r\n";
1134 static const char FTP_RESPONSE[] =
1135 "HTTP/1.0 400 Invalid request received from client\r\n"
1136 "Content-Type: text/plain\r\n"
1137 "Connection: close\r\n\r\n"
1138 "Invalid request. Privoxy doesn't support FTP.\r\n";
1140 static const char GOPHER_RESPONSE[] =
1141 "HTTP/1.0 400 Invalid request received from client\r\n"
1142 "Content-Type: text/plain\r\n"
1143 "Connection: close\r\n\r\n"
1144 "Invalid request. Privoxy doesn't support gopher.\r\n";
1146 /* XXX: should be a template */
1147 static const char MISSING_DESTINATION_RESPONSE[] =
1148 "HTTP/1.0 400 Bad request received from client\r\n"
1149 "Proxy-Agent: Privoxy " VERSION "\r\n"
1150 "Content-Type: text/plain\r\n"
1151 "Connection: close\r\n\r\n"
1152 "Bad request. Privoxy was unable to extract the destination.\r\n";
1154 /* XXX: should be a template */
1155 static const char NO_SERVER_DATA_RESPONSE[] =
1156 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1157 "Proxy-Agent: Privoxy " VERSION "\r\n"
1158 "Content-Type: text/plain\r\n"
1159 "Connection: close\r\n\r\n"
1160 "Empty server or forwarder response.\r\n"
1161 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1164 /* XXX: should be a template */
1165 static const char NULL_BYTE_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. Null byte(s) before end of request.\r\n";
1173 /* XXX: should be a template */
1174 static const char MESSED_UP_REQUEST_RESPONSE[] =
1175 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1176 "Proxy-Agent: Privoxy " VERSION "\r\n"
1177 "Content-Type: text/plain\r\n"
1178 "Connection: close\r\n\r\n"
1179 "Bad request. Messed up with header filters.\r\n";
1181 /* A function to crunch a response */
1182 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1184 /* Crunch function flags */
1185 #define CF_NO_FLAGS 0
1186 /* Cruncher applies to forced requests as well */
1187 #define CF_IGNORE_FORCE 1
1188 /* Crunched requests are counted for the block statistics */
1189 #define CF_COUNT_AS_REJECT 2
1191 /* A crunch function and its flags */
1194 const crunch_func_ptr cruncher;
1198 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1200 /* Complete list of cruncher functions */
1201 static const struct cruncher crunchers_all[] = {
1202 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1203 { block_url, CF_COUNT_AS_REJECT },
1204 #ifdef FEATURE_TRUST
1205 { trust_url, CF_COUNT_AS_REJECT },
1206 #endif /* def FEATURE_TRUST */
1207 { redirect_url, CF_NO_FLAGS },
1208 { dispatch_cgi, CF_IGNORE_FORCE},
1212 /* Light version, used after tags are applied */
1213 static const struct cruncher crunchers_light[] = {
1214 { block_url, CF_COUNT_AS_REJECT },
1215 { redirect_url, CF_NO_FLAGS },
1220 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1221 /*********************************************************************
1223 * Function : sig_handler
1225 * Description : Signal handler for different signals.
1226 * Exit gracefully on TERM and INT
1227 * or set a flag that will cause the errlog
1228 * to be reopened by the main thread on HUP.
1231 * 1 : the_signal = the signal cause this function to call
1235 *********************************************************************/
1236 static void sig_handler(int the_signal)
1242 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1253 received_hup_signal = 1;
1258 * We shouldn't be here, unless we catch signals
1259 * in main() that we can't handle here!
1261 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1269 /*********************************************************************
1271 * Function : client_protocol_is_unsupported
1273 * Description : Checks if the client used a known unsupported
1274 * protocol and deals with it by sending an error
1278 * 1 : csp = Current client state (buffers, headers, etc...)
1279 * 2 : req = the first request line send by the client
1281 * Returns : TRUE if an error response has been generated, or
1282 * FALSE if the request doesn't look invalid.
1284 *********************************************************************/
1285 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1287 char buf[BUFFER_SIZE];
1290 * If it's a FTP or gopher request, we don't support it.
1292 * These checks are better than nothing, but they might
1293 * not work in all configurations and some clients might
1294 * have problems digesting the answer.
1296 * They should, however, never cause more problems than
1297 * Privoxy's old behaviour (returning the misleading HTML
1300 * "Could not resolve http://(ftp|gopher)://example.org").
1302 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1304 if (!strncmpic(req, "GET ftp://", 10))
1306 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1307 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1308 csp->ip_addr_str, req);
1312 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1313 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1314 csp->ip_addr_str, req);
1316 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1318 write_socket(csp->cfd, buf, strlen(buf));
1327 /*********************************************************************
1329 * Function : get_request_destination_elsewhere
1331 * Description : If the client's request was redirected into
1332 * Privoxy without the client's knowledge,
1333 * the request line lacks the destination host.
1335 * This function tries to get it elsewhere,
1336 * provided accept-intercepted-requests is enabled.
1338 * "Elsewhere" currently only means "Host: header",
1339 * but in the future we may ask the redirecting
1340 * packet filter to look the destination up.
1342 * If the destination stays unknown, an error
1343 * response is send to the client and headers
1344 * are freed so that chat() can return directly.
1347 * 1 : csp = Current client state (buffers, headers, etc...)
1348 * 2 : headers = a header list
1350 * Returns : JB_ERR_OK if the destination is now known, or
1351 * JB_ERR_PARSE if it isn't.
1353 *********************************************************************/
1354 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1358 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1360 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1361 " Privoxy isn't configured to accept intercepted requests.",
1362 csp->ip_addr_str, csp->http->cmd);
1363 /* XXX: Use correct size */
1364 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1365 csp->ip_addr_str, csp->http->cmd);
1367 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1368 destroy_list(headers);
1370 return JB_ERR_PARSE;
1372 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1374 /* Split the domain we just got for pattern matching */
1375 init_domain_components(csp->http);
1381 /* We can't work without destination. Go spread the news.*/
1383 req = list_to_text(headers);
1385 /* XXX: Use correct size */
1386 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1387 csp->ip_addr_str, csp->http->cmd);
1388 log_error(LOG_LEVEL_ERROR,
1389 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1390 csp->ip_addr_str, csp->http->cmd, req);
1393 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1394 destroy_list(headers);
1396 return JB_ERR_PARSE;
1399 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1400 * to get the destination IP address, use it as host directly
1401 * or do a reverse DNS lookup first.
1406 /*********************************************************************
1408 * Function : get_server_headers
1410 * Description : Parses server headers in iob and fills them
1411 * into csp->headers so that they can later be
1415 * 1 : csp = Current client state (buffers, headers, etc...)
1417 * Returns : JB_ERR_OK if everything went fine, or
1418 * JB_ERR_PARSE if the headers were incomplete.
1420 *********************************************************************/
1421 static jb_err get_server_headers(struct client_state *csp)
1423 int continue_hack_in_da_house = 0;
1426 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1431 * continue hack in da house. Ignore the ending of
1432 * this head and continue enlisting header lines.
1433 * The reason is described below.
1435 enlist(csp->headers, "");
1436 continue_hack_in_da_house = 0;
1439 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1442 * It's a bodyless continue response, don't
1443 * stop header parsing after reaching it's end.
1445 * As a result Privoxy will concatenate the
1446 * next response's head and parse and deliver
1447 * the headers as if they belonged to one request.
1449 * The client will separate them because of the
1450 * empty line between them.
1452 * XXX: What we're doing here is clearly against
1453 * the intended purpose of the continue header,
1454 * and under some conditions (HTTP/1.0 client request)
1455 * it's a standard violation.
1457 * Anyway, "sort of against the spec" is preferable
1458 * to "always getting confused by Continue responses"
1459 * (Privoxy's behaviour before this hack was added)
1461 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1462 continue_hack_in_da_house = 1;
1464 else if (*header == '\0')
1467 * If the header is empty, but the Continue hack
1468 * isn't active, we can assume that we reached the
1469 * end of the buffer before we hit the end of the
1472 * Inform the caller an let it decide how to handle it.
1474 return JB_ERR_PARSE;
1478 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1481 * XXX: Should we quit the request and return a
1482 * out of memory error page instead?
1484 log_error(LOG_LEVEL_ERROR,
1485 "Out of memory while enlisting server headers. %s lost.",
1495 /*********************************************************************
1497 * Function : crunch_reason
1499 * Description : Translates the crunch reason code into a string.
1502 * 1 : rsp = a http_response
1504 * Returns : A string with the crunch reason or an error description.
1506 *********************************************************************/
1507 static const char *crunch_reason(const struct http_response *rsp)
1509 char * reason = NULL;
1511 assert(rsp != NULL);
1514 return "Internal error while searching for crunch reason";
1517 switch (rsp->reason)
1519 case RSP_REASON_UNSUPPORTED:
1520 reason = "Unsupported HTTP feature";
1522 case RSP_REASON_BLOCKED:
1525 case RSP_REASON_UNTRUSTED:
1526 reason = "Untrusted";
1528 case RSP_REASON_REDIRECTED:
1529 reason = "Redirected";
1531 case RSP_REASON_CGI_CALL:
1532 reason = "CGI Call";
1534 case RSP_REASON_NO_SUCH_DOMAIN:
1535 reason = "DNS failure";
1537 case RSP_REASON_FORWARDING_FAILED:
1538 reason = "Forwarding failed";
1540 case RSP_REASON_CONNECT_FAILED:
1541 reason = "Connection failure";
1543 case RSP_REASON_OUT_OF_MEMORY:
1544 reason = "Out of memory (may mask other reasons)";
1547 reason = "No reason recorded";
1555 /*********************************************************************
1557 * Function : send_crunch_response
1559 * Description : Delivers already prepared response for
1560 * intercepted requests, logs the interception
1561 * and frees the response.
1564 * 1 : csp = Current client state (buffers, headers, etc...)
1565 * 1 : rsp = Fully prepared response. Will be freed on exit.
1567 * Returns : Nothing.
1569 *********************************************************************/
1570 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1572 const struct http_request *http = csp->http;
1573 char status_code[4];
1575 assert(rsp != NULL);
1576 assert(rsp->head != NULL);
1581 * Not supposed to happen. If it does
1582 * anyway, treat it as an unknown error.
1584 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1585 /* return code doesn't matter */
1590 /* If rsp is still NULL, we have serious internal problems. */
1591 log_error(LOG_LEVEL_FATAL,
1592 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1596 * Extract the status code from the actual head
1597 * that was send to the client. It is the only
1598 * way to get it right for all requests, including
1599 * the fixed ones for out-of-memory problems.
1601 * A head starts like this: 'HTTP/1.1 200...'
1605 status_code[0] = rsp->head[9];
1606 status_code[1] = rsp->head[10];
1607 status_code[2] = rsp->head[11];
1608 status_code[3] = '\0';
1610 /* Write the answer to the client */
1611 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1612 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1614 /* There is nothing we can do about it. */
1615 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1618 /* Log that the request was crunched and why. */
1619 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1620 http->hostport, http->path, crunch_reason(rsp));
1621 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1622 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1624 /* Clean up and return */
1625 if (cgi_error_memory() != rsp)
1627 free_http_response(rsp);
1634 /*********************************************************************
1636 * Function : request_contains_null_bytes
1638 * Description : Checks for NULL bytes in the request and sends
1639 * an error message to the client if any were found.
1641 * XXX: currently not used, see comment in chat().
1644 * 1 : csp = Current client state (buffers, headers, etc...)
1645 * 2 : buf = Data from the client's request to check.
1646 * 3 : len = The data length.
1648 * Returns : TRUE if the request contained one or more NULL bytes, or
1651 *********************************************************************/
1652 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1654 size_t c_len; /* Request lenght when treated as C string */
1656 c_len = strlen(buf);
1661 * Null byte(s) found. Log the request,
1662 * return an error response and hang up.
1664 size_t tmp_len = c_len;
1669 * Replace NULL byte(s) with '°' characters
1670 * so the request can be logged as string.
1671 * XXX: Is there a better replacement character?
1674 tmp_len += strlen(buf+tmp_len);
1675 } while (tmp_len < len);
1677 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1678 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1679 log_error(LOG_LEVEL_HEADER,
1680 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1682 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1684 /* XXX: Log correct size */
1685 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1695 /*********************************************************************
1697 * Function : crunch_response_triggered
1699 * Description : Checks if the request has to be crunched,
1700 * and delivers the crunch response if necessary.
1703 * 1 : csp = Current client state (buffers, headers, etc...)
1704 * 2 : crunchers = list of cruncher functions to run
1706 * Returns : TRUE if the request was answered with a crunch response
1709 *********************************************************************/
1710 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1712 struct http_response *rsp = NULL;
1713 const struct cruncher *c;
1716 * If CGI request crunching is disabled,
1717 * check the CGI dispatcher out of order to
1718 * prevent unintentional blocks or redirects.
1720 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1721 && (NULL != (rsp = dispatch_cgi(csp))))
1723 /* Deliver, log and free the interception response. */
1724 send_crunch_response(csp, rsp);
1728 for (c = crunchers; c->cruncher != NULL; c++)
1731 * Check the cruncher if either Privoxy is toggled
1732 * on and the request isn't forced, or if the cruncher
1733 * applies to forced requests as well.
1735 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1736 !(csp->flags & CSP_FLAG_FORCED)) ||
1737 (c->flags & CF_IGNORE_FORCE))
1739 rsp = c->cruncher(csp);
1742 /* Deliver, log and free the interception response. */
1743 send_crunch_response(csp, rsp);
1744 #ifdef FEATURE_STATISTICS
1745 if (c->flags & CF_COUNT_AS_REJECT)
1747 csp->flags |= CSP_FLAG_REJECTED;
1749 #endif /* def FEATURE_STATISTICS */
1760 /*********************************************************************
1762 * Function : build_request_line
1764 * Description : Builds the HTTP request line.
1766 * If a HTTP forwarder is used it expects the whole URL,
1767 * web servers only get the path.
1770 * 1 : csp = Current client state (buffers, headers, etc...)
1771 * 2 : fwd = The forwarding spec used for the request
1772 * XXX: Should use http->fwd instead.
1773 * 3 : request_line = The old request line which will be replaced.
1775 * Returns : Nothing. Terminates in case of memory problems.
1777 *********************************************************************/
1778 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1780 struct http_request *http = csp->http;
1782 assert(http->ssl == 0);
1785 * Downgrade http version from 1.1 to 1.0
1786 * if +downgrade action applies.
1788 if ( (csp->action->flags & ACTION_DOWNGRADE)
1789 && (!strcmpic(http->ver, "HTTP/1.1")))
1792 http->ver = strdup("HTTP/1.0");
1794 if (http->ver == NULL)
1796 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1801 * Rebuild the request line.
1803 freez(*request_line);
1804 *request_line = strdup(http->gpc);
1805 string_append(request_line, " ");
1807 if (fwd->forward_host)
1809 string_append(request_line, http->url);
1813 string_append(request_line, http->path);
1815 string_append(request_line, " ");
1816 string_append(request_line, http->ver);
1818 if (*request_line == NULL)
1820 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1822 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1826 /*********************************************************************
1828 * Function : change_request_destination
1830 * Description : Parse a (rewritten) request line and regenerate
1831 * the http request data.
1834 * 1 : csp = Current client state (buffers, headers, etc...)
1836 * Returns : Forwards the parse_http_request() return code.
1837 * Terminates in case of memory problems.
1839 *********************************************************************/
1840 static jb_err change_request_destination(struct client_state *csp)
1842 struct http_request *http = csp->http;
1845 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1846 free_http_request(http);
1847 err = parse_http_request(csp->headers->first->str, http, csp);
1848 if (JB_ERR_OK != err)
1850 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1851 jb_err_to_string(err));
1853 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1854 if (http->ocmd == NULL)
1856 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1863 /*********************************************************************
1867 * Description : Once a connection to the client has been accepted,
1868 * this function is called (via serve()) to handle the
1869 * main business of the communication. When this
1870 * function returns, the caller must close the client
1873 * FIXME: chat is nearly thousand lines long.
1877 * 1 : csp = Current client state (buffers, headers, etc...)
1879 * Returns : Nothing.
1881 *********************************************************************/
1882 static void chat(struct client_state *csp)
1884 char buf[BUFFER_SIZE];
1892 int ms_iis5_hack = 0;
1893 size_t byte_count = 0;
1894 int forwarded_connect_retries = 0;
1895 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1896 const struct forward_spec * fwd;
1897 struct http_request *http;
1898 int len; /* for buffer sizes (and negative error codes) */
1900 #ifdef FEATURE_KILL_POPUPS
1901 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1902 #endif /* def FEATURE_KILL_POPUPS */
1904 /* Function that does the content filtering for the current request */
1905 filter_function_ptr content_filter = NULL;
1907 /* Skeleton for HTTP response, if we should intercept the request */
1908 struct http_response *rsp;
1910 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1911 struct list header_list;
1912 struct list *headers = &header_list;
1916 memset(buf, 0, sizeof(buf));
1919 * Read the client's request. Note that since we're not using select() we
1920 * could get blocked here if a client connected, then didn't say anything!
1925 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1927 if (len <= 0) break; /* error! */
1930 * If there is no memory left for buffering the
1931 * request, there is nothing we can do but hang up
1933 if (add_to_iob(csp, buf, len))
1938 req = get_header(csp);
1940 } while ((NULL != req) && ('\0' == *req));
1942 if ((NULL != req) && ('\0' != *req))
1944 /* Request received. Validate and parse it. */
1948 * XXX: Temporary disabled to prevent problems
1949 * with POST requests whose bodies are allowed to
1950 * contain NULL bytes. BR#1730105.
1952 * The main purpose of this check is to properly
1953 * log stuff like BitTorrent traffic and other junk
1954 * that hits public proxies. It's not required for
1955 * Privoxy to functions as those requests are discarded
1958 * It probably should be rewritten to only check
1959 * the head of the request. Another option would
1960 * be to let all POST requests pass, although that
1961 * may not be good enough.
1963 if (request_contains_null_bytes(csp, buf, len))
1965 /* NULL bytes found and dealt with, just hang up. */
1970 /* Does the request line look invalid? */
1971 if (client_protocol_is_unsupported(csp, req))
1974 * Yes. The request has already been
1975 * answered with a error response, the buffers
1976 * were freed and we're done with chatting.
1981 #ifdef FEATURE_FORCE_LOAD
1983 * If this request contains the FORCE_PREFIX and blocks
1984 * aren't enforced, get rid of it and set the force flag.
1986 if (strstr(req, FORCE_PREFIX))
1988 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1990 log_error(LOG_LEVEL_FORCE,
1991 "Ignored force prefix in request: \"%s\".", req);
1995 strclean(req, FORCE_PREFIX);
1996 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
1997 csp->flags |= CSP_FLAG_FORCED;
2001 #endif /* def FEATURE_FORCE_LOAD */
2002 err = parse_http_request(req, http, csp);
2003 if (JB_ERR_OK != err)
2005 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2011 if (http->cmd == NULL)
2013 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2014 /* XXX: Use correct size */
2015 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2016 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2018 free_http_request(http);
2022 /* grab the rest of the client's headers */
2026 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2028 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2031 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2032 destroy_list(headers);
2037 * If there is no memory left for buffering the
2038 * request, there is nothing we can do but hang up
2040 if (add_to_iob(csp, buf, len))
2042 destroy_list(headers);
2048 if (p == NULL) break;
2055 if (http->host == NULL)
2058 * If we still don't know the request destination,
2059 * the request is invalid or the client uses
2060 * Privoxy without its knowledge.
2062 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2065 * Our attempts to get the request destination
2066 * elsewhere failed or Privoxy is configured
2067 * to only accept proxy requests.
2069 * An error response has already been send
2070 * and we're done here.
2077 * Determine the actions for this URL
2079 #ifdef FEATURE_TOGGLE
2080 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2082 /* Most compatible set of actions (i.e. none) */
2083 init_current_action(csp->action);
2086 #endif /* ndef FEATURE_TOGGLE */
2088 url_actions(http, csp);
2092 * Save a copy of the original request for logging
2094 http->ocmd = strdup(http->cmd);
2096 if (http->ocmd == NULL)
2098 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2101 enlist(csp->headers, http->cmd);
2103 /* Append the previously read headers */
2104 list_append_list_unique(csp->headers, headers);
2105 destroy_list(headers);
2107 err = sed(client_patterns, add_client_headers, csp);
2108 if (JB_ERR_OK != err)
2110 assert(err == JB_ERR_PARSE);
2111 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2113 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2115 /* Check request line for rewrites. */
2116 if ((NULL == csp->headers->first->str)
2117 || (strcmp(http->cmd, csp->headers->first->str) &&
2118 (JB_ERR_OK != change_request_destination(csp))))
2121 * A header filter broke the request line - bail out.
2123 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2124 /* XXX: Use correct size */
2125 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2126 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2128 free_http_request(http);
2132 /* decide how to route the HTTP request */
2133 if (NULL == (fwd = forward_url(http, csp)))
2135 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2136 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2140 * build the http request to send to the server
2141 * we have to do one of the following:
2143 * create = use the original HTTP request to create a new
2144 * HTTP request that has either the path component
2145 * without the http://domainspec (w/path) or the
2146 * full orininal URL (w/url)
2147 * Note that the path and/or the HTTP version may
2148 * have been altered by now.
2150 * connect = Open a socket to the host:port of the server
2151 * and short-circuit server and client socket.
2153 * pass = Pass the request unchanged if forwarding a CONNECT
2154 * request to a parent proxy. Note that we'll be sending
2155 * the CFAIL message ourselves if connecting to the parent
2156 * fails, but we won't send a CSUCCEED message if it works,
2157 * since that would result in a double message (ours and the
2158 * parent's). After sending the request to the parent, we simply
2161 * here's the matrix:
2164 * +--------+--------+
2166 * 0 | create | connect|
2168 * Forwarding +--------+--------+
2170 * 1 | create | pass |
2172 * +--------+--------+
2177 * Check if a CONNECT request is allowable:
2178 * In the absence of a +limit-connect action, allow only port 443.
2179 * If there is an action, allow whatever matches the specificaton.
2183 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
2184 || (csp->action->flags & ACTION_LIMIT_CONNECT
2185 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
2187 const char *acceptable_connect_ports =
2188 csp->action->string[ACTION_STRING_LIMIT_CONNECT] ?
2189 csp->action->string[ACTION_STRING_LIMIT_CONNECT] :
2190 "443 (implied default)";
2191 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2194 * The response may confuse some clients,
2195 * but makes unblocking easier.
2197 * XXX: It seems to work with all major browsers,
2198 * so we should consider returning a body by default someday ...
2200 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2201 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2202 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2203 csp->action->flags |= ACTION_BLOCK;
2208 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2209 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2210 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2211 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2212 assert(NULL != csp->http->ocmd);
2213 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2215 list_remove_all(csp->headers);
2217 * XXX: For consistency we might want to log a crunch message here.
2226 freez(csp->headers->first->str);
2227 build_request_line(csp, fwd, &csp->headers->first->str);
2230 hdr = list_to_text(csp->headers);
2233 /* FIXME Should handle error properly */
2234 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2238 * We have a request. Check if one of the crunchers wants it.
2240 if (crunch_response_triggered(csp, crunchers_all))
2243 * Yes. The client got the crunch response
2244 * and we are done here after cleaning up.
2247 list_remove_all(csp->headers);
2253 * The headers can't be removed earlier because
2254 * they were still needed for the referrer check
2255 * in case of CGI crunches.
2257 * XXX: Would it be worth to move the referrer check
2258 * into client_referrer() and set a flag if it's trusted?
2260 list_remove_all(csp->headers);
2262 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2264 if (fwd->forward_host)
2266 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2267 fwd->forward_host, fwd->forward_port, http->hostport);
2271 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2274 /* here we connect to the server, gateway, or the forwarder */
2276 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2277 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2279 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2280 forwarded_connect_retries, http->hostport);
2283 if (csp->sfd == JB_INVALID_SOCKET)
2285 if (fwd->type != SOCKS_NONE)
2288 rsp = error_response(csp, "forwarding-failed", errno);
2290 else if (errno == EINVAL)
2292 rsp = error_response(csp, "no-such-domain", errno);
2296 rsp = error_response(csp, "connect-failed", errno);
2297 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2302 /* Write the answer to the client */
2305 send_crunch_response(csp, rsp);
2312 if (fwd->forward_host || (http->ssl == 0))
2314 /* write the client's (modified) header to the server
2315 * (along with anything else that may be in the buffer)
2318 if (write_socket(csp->sfd, hdr, strlen(hdr))
2319 || (flush_socket(csp->sfd, csp) < 0))
2321 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2324 rsp = error_response(csp, "connect-failed", errno);
2328 send_crunch_response(csp, rsp);
2338 * We're running an SSL tunnel and we're not forwarding,
2339 * so just send the "connect succeeded" message to the
2340 * client, flush the rest, and get out of the way.
2342 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2350 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2352 /* we're finished with the client's header */
2355 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2357 /* pass data between the client and server
2358 * until one or the other shuts down the connection.
2367 * FD_ZERO here seems to point to an errant macro which crashes.
2368 * So do this by hand for now...
2370 memset(&rfds,0x00,sizeof(fd_set));
2374 FD_SET(csp->cfd, &rfds);
2375 FD_SET(csp->sfd, &rfds);
2377 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2381 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2385 /* this is the body of the browser's request
2386 * just read it and write it.
2389 if (FD_ISSET(csp->cfd, &rfds))
2391 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2395 break; /* "game over, man" */
2398 if (write_socket(csp->sfd, buf, (size_t)len))
2400 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2407 * The server wants to talk. It could be the header or the body.
2408 * If `hdr' is null, then it's the header otherwise it's the body.
2409 * FIXME: Does `hdr' really mean `host'? No.
2413 if (FD_ISSET(csp->sfd, &rfds))
2416 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2420 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2422 if (http->ssl && (fwd->forward_host == NULL))
2425 * Just hang up. We already confirmed the client's CONNECT
2426 * request with status code 200 and unencrypted content is
2427 * no longer welcome.
2429 log_error(LOG_LEVEL_ERROR,
2430 "CONNECT already confirmed. Unable to tell the client about the problem.");
2433 else if (byte_count)
2436 * Just hang up. We already transmitted the original headers
2437 * and parts of the original content and therefore missed the
2438 * chance to send an error message (without risking data corruption).
2440 * XXX: we could retry with a fancy range request here.
2442 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2443 "Unable to tell the client about the problem.");
2447 rsp = error_response(csp, "connect-failed", errno);
2451 send_crunch_response(csp, rsp);
2457 /* Add a trailing zero. This lets filter_popups
2458 * use string operations.
2462 #ifdef FEATURE_KILL_POPUPS
2463 /* Filter the popups on this read. */
2464 if (block_popups_now)
2466 filter_popups(buf, csp);
2468 #endif /* def FEATURE_KILL_POPUPS */
2470 /* Normally, this would indicate that we've read
2471 * as much as the server has sent us and we can
2472 * close the client connection. However, Microsoft
2473 * in its wisdom has released IIS/5 with a bug that
2474 * prevents it from sending the trailing \r\n in
2475 * a 302 redirect header (and possibly other headers).
2476 * To work around this if we've haven't parsed
2477 * a full header we'll append a trailing \r\n
2478 * and see if this now generates a valid one.
2480 * This hack shouldn't have any impacts. If we've
2481 * already transmitted the header or if this is a
2482 * SSL connection, then we won't bother with this
2483 * hack. So we only work on partially received
2484 * headers. If we append a \r\n and this still
2485 * doesn't generate a valid header, then we won't
2486 * transmit anything to the client.
2491 if (server_body || http->ssl)
2494 * If we have been buffering up the document,
2495 * now is the time to apply content modification
2496 * and send the result to the client.
2500 p = execute_content_filter(csp, content_filter);
2502 * If the content filter fails, use the original
2503 * buffer and length.
2504 * (see p != NULL ? p : csp->iob->cur below)
2508 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2511 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2513 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2516 hdr = list_to_text(csp->headers);
2519 /* FIXME Should handle error properly */
2520 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2524 * Shouldn't happen because this was the second sed run
2525 * and tags are only created for the first one.
2527 assert(!crunch_response_triggered(csp, crunchers_all));
2529 if (write_socket(csp->cfd, hdr, strlen(hdr))
2530 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2532 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2542 break; /* "game over, man" */
2546 * This is NOT the body, so
2547 * Let's pretend the server just sent us a blank line.
2549 log_error(LOG_LEVEL_INFO,
2550 "Malformerd HTTP headers detected and MS IIS5 hack enabled. "
2551 "Expect an invalid response or even no response at all.");
2552 snprintf(buf, sizeof(buf), "\r\n");
2553 len = (int)strlen(buf);
2556 * Now, let the normal header parsing algorithm below do its
2557 * job. If it fails, we'll exit instead of continuing.
2564 * If this is an SSL connection or we're in the body
2565 * of the server document, just write it to the client,
2566 * unless we need to buffer the body for later content-filtering
2569 if (server_body || http->ssl)
2574 * If there is no memory left for buffering the content, or the buffer limit
2575 * has been reached, switch to non-filtering mode, i.e. make & write the
2576 * header, flush the iob and buf, and get out of the way.
2578 if (add_to_iob(csp, buf, len))
2583 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2585 hdr = list_to_text(csp->headers);
2589 * Memory is too tight to even generate the header.
2590 * Send our static "Out-of-memory" page.
2592 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2593 rsp = cgi_error_memory();
2594 send_crunch_response(csp, rsp);
2598 hdrlen = strlen(hdr);
2600 if (write_socket(csp->cfd, hdr, hdrlen)
2601 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2602 || (write_socket(csp->cfd, buf, (size_t)len)))
2604 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2611 * Reset the byte_count to the amount of bytes
2612 * we just flushed. len will be added a few lines below,
2613 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2615 byte_count = (size_t)flushed;
2617 content_filter = NULL;
2623 if (write_socket(csp->cfd, buf, (size_t)len))
2625 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2629 byte_count += (size_t)len;
2634 /* we're still looking for the end of the
2635 * server's header ... (does that make header
2636 * parsing an "out of body experience" ?
2640 * buffer up the data we just read. If that fails,
2641 * there's little we can do but send our static
2642 * out-of-memory page.
2644 if (add_to_iob(csp, buf, len))
2646 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2647 rsp = cgi_error_memory();
2648 send_crunch_response(csp, rsp);
2653 /* Convert iob into something sed() can digest */
2654 if (JB_ERR_PARSE == get_server_headers(csp))
2658 /* Well, we tried our MS IIS/5
2659 * hack and it didn't work.
2660 * The header is incomplete
2661 * and there isn't anything
2662 * we can do about it.
2668 /* Since we have to wait for
2669 * more from the server before
2670 * we can parse the headers
2671 * we just continue here.
2677 /* Did we actually get anything? */
2678 if (NULL == csp->headers->first)
2680 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2681 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2682 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2683 free_http_request(http);
2687 /* we have now received the entire header.
2688 * filter it and send the result to the client
2690 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2692 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2694 hdr = list_to_text(csp->headers);
2697 /* FIXME Should handle error properly */
2698 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2701 if (crunch_response_triggered(csp, crunchers_light))
2704 * One of the tags created by a server-header
2705 * tagger triggered a crunch. We already
2706 * delivered the crunch response to the client
2707 * and are done here after cleaning up.
2712 /* Buffer and pcrs filter this if appropriate. */
2714 if (!http->ssl) /* We talk plaintext */
2717 #ifdef FEATURE_KILL_POPUPS
2718 /* Start blocking popups if appropriate. */
2719 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2720 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2722 block_popups_now = 1;
2724 * Filter the part of the body that came in the same read
2725 * as the last headers:
2727 filter_popups(csp->iob->cur, csp);
2729 #endif /* def FEATURE_KILL_POPUPS */
2730 content_filter = get_filter_function(csp);
2733 * Only write if we're not buffering for content modification
2735 if (!content_filter)
2737 /* write the server's (modified) header to
2738 * the client (along with anything else that
2739 * may be in the buffer)
2742 if (write_socket(csp->cfd, hdr, strlen(hdr))
2743 || ((len = flush_socket(csp->cfd, csp)) < 0))
2745 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2747 /* the write failed, so don't bother
2748 * mentioning it to the client...
2749 * it probably can't hear us anyway.
2755 byte_count += (size_t)len;
2758 /* we're finished with the server's header */
2763 /* If this was a MS IIS/5 hack then it means
2764 * the server has already closed the
2765 * connection. Nothing more to read. Time
2776 return; /* huh? we should never get here */
2779 if (csp->content_length == 0)
2782 * If Privoxy didn't recalculate the
2783 * Content-Lenght, byte_count is still
2786 csp->content_length = byte_count;
2789 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2790 csp->ip_addr_str, http->ocmd, csp->content_length);
2794 /*********************************************************************
2798 * Description : This is little more than chat. We only "serve" to
2799 * to close any socket that chat may have opened.
2802 * 1 : csp = Current client state (buffers, headers, etc...)
2806 *********************************************************************/
2808 void serve(struct client_state *csp)
2809 #else /* ifndef AMIGA */
2810 static void serve(struct client_state *csp)
2811 #endif /* def AMIGA */
2814 close_socket(csp->cfd);
2816 if (csp->sfd != JB_INVALID_SOCKET)
2818 close_socket(csp->sfd);
2821 csp->flags &= ~CSP_FLAG_ACTIVE;
2827 /*********************************************************************
2829 * Function : server_thread
2831 * Description : We only exist to call `serve' in a threaded environment.
2834 * 1 : data = Current client state (buffers, headers, etc...)
2836 * Returns : Always 0.
2838 *********************************************************************/
2839 static int32 server_thread(void *data)
2841 serve((struct client_state *) data);
2848 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2849 /*********************************************************************
2853 * Description : Print usage info & exit.
2855 * Parameters : Pointer to argv[0] for identifying ourselves
2859 *********************************************************************/
2860 static void usage(const char *myname)
2862 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2866 #endif /* defined(unix) */
2869 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2870 #endif /* defined(unix) */
2871 "[--version] [configfile]\n"
2872 "Aborting\n", myname);
2877 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2880 /*********************************************************************
2882 * Function : initialize_mutexes
2884 * Description : Prepares mutexes if mutex support is available.
2888 * Returns : Void, exits in case of errors.
2890 *********************************************************************/
2891 static void initialize_mutexes(void)
2895 #ifdef FEATURE_PTHREAD
2897 * Prepare global mutex semaphores
2899 err = pthread_mutex_init(&log_mutex, 0);
2901 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2904 * XXX: The assumptions below are a bit naive
2905 * and can cause locks that aren't necessary.
2907 * For example older FreeBSD versions (< 6.x?)
2908 * have no gethostbyname_r, but gethostbyname is
2911 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2912 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2913 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2915 * XXX: should we use a single mutex for
2916 * localtime() and gmtime() as well?
2918 #ifndef HAVE_GMTIME_R
2919 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2920 #endif /* ndef HAVE_GMTIME_R */
2922 #ifndef HAVE_LOCALTIME_R
2923 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2924 #endif /* ndef HAVE_GMTIME_R */
2927 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2928 #endif /* ndef HAVE_RANDOM */
2929 #endif /* FEATURE_PTHREAD */
2932 * TODO: mutex support for mingw32 would be swell.
2937 printf("Fatal error. Mutex initialization failed: %s.\n",
2946 /*********************************************************************
2950 * Description : Load the config file and start the listen loop.
2951 * This function is a lot more *sane* with the `load_config'
2952 * and `listen_loop' functions; although it stills does
2953 * a *little* too much for my taste.
2956 * 1 : argc = Number of parameters (including $0).
2957 * 2 : argv = Array of (char *)'s to the parameters.
2959 * Returns : 1 if : can't open config file, unrecognized directive,
2960 * stats requested in multi-thread mode, can't open the
2961 * log file, can't open the jar file, listen port is invalid,
2962 * any load fails, and can't bind port.
2964 * Else main never returns, the process must be signaled
2965 * to terminate execution. Or, on Windows, use the
2966 * "File", "Exit" menu option.
2968 *********************************************************************/
2970 int real_main(int argc, const char *argv[])
2972 int main(int argc, const char *argv[])
2976 unsigned int random_seed;
2978 struct passwd *pw = NULL;
2979 struct group *grp = NULL;
2982 char *pre_chroot_nslookup_to_load_resolver = NULL;
2989 #if !defined(_WIN32)
2997 * Parse the command line arguments
2999 * XXX: simply printing usage information in case of
3000 * invalid arguments isn't particular user friendly.
3002 while (++argc_pos < argc)
3005 /* Check to see if the service must be installed or uninstalled */
3006 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3008 const char *pName = argv[argc_pos] + 9;
3011 exit( (install_service(pName)) ? 0 : 1 );
3013 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3015 const char *pName = argv[argc_pos] + 11;
3018 exit((uninstall_service(pName)) ? 0 : 1);
3020 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3022 bRunAsService = TRUE;
3023 w32_set_service_cwd();
3024 atexit(w32_service_exit_notify);
3027 #endif /* defined(_WIN32) */
3030 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3032 if (strcmp(argv[argc_pos], "--help") == 0)
3037 else if(strcmp(argv[argc_pos], "--version") == 0)
3039 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3045 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3050 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3052 if (++argc_pos == argc) usage(argv[0]);
3053 pidfile = strdup(argv[argc_pos]);
3056 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3058 if (++argc_pos == argc) usage(argv[argc_pos]);
3060 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3063 if (NULL == (grp = getgrnam(p)))
3065 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3069 if (NULL == (pw = getpwnam(argv[argc_pos])))
3071 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3074 if (p != NULL) *--p = '\0';
3077 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3079 if (++argc_pos == argc) usage(argv[0]);
3080 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3083 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3087 #endif /* defined(unix) */
3089 else if (argc_pos + 1 != argc)
3092 * This is neither the last command line
3093 * option, nor was it recognized before,
3094 * therefore it must be invalid.
3100 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3102 configfile = argv[argc_pos];
3105 } /* -END- while (more arguments) */
3108 if ( *configfile != '/' )
3110 char cwd[BUFFER_SIZE];
3112 size_t abs_file_size;
3114 /* make config-filename absolute here */
3115 if (NULL == getcwd(cwd, sizeof(cwd)))
3117 perror("failed to get current working directory");
3122 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3123 basedir = strdup(cwd);
3125 if (NULL == basedir ||
3126 NULL == (abs_file = malloc(abs_file_size)))
3128 perror("malloc failed");
3131 strlcpy(abs_file, basedir, abs_file_size);
3132 strlcat(abs_file, "/", abs_file_size );
3133 strlcat(abs_file, configfile, abs_file_size);
3134 configfile = abs_file;
3136 #endif /* defined unix */
3140 clients->next = NULL;
3142 /* XXX: factor out initialising after the next stable release. */
3145 #elif defined(_WIN32)
3149 /* Prepare mutexes if supported and necessary. */
3150 initialize_mutexes();
3152 /* Enable logging until further notice. */
3153 init_log_module(Argv[0]);
3155 random_seed = (unsigned int)time(NULL);
3157 srandom(random_seed);
3158 #elif defined (_WIN32)
3160 * See pick_from_range() in miscutil.c for details.
3162 log_error(LOG_LEVEL_INFO,
3163 "No thread-safe PRNG implemented for your platform. "
3164 "Using weak \'randomization\' factor which will "
3165 "limit the already questionable usefulness of "
3166 "header-time-randomizing actions (disabled by default).");
3169 #endif /* ifdef HAVE_RANDOM */
3172 * Unix signal handling
3174 * Catch the abort, interrupt and terminate signals for a graceful exit
3175 * Catch the hangup signal so the errlog can be reopened.
3176 * Ignore the broken pipe signals (FIXME: Why?)
3178 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3181 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3182 const int ignored_signals[] = { SIGPIPE, 0 };
3184 for (idx = 0; catched_signals[idx] != 0; idx++)
3186 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3187 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3189 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3190 #endif /* ifdef sun */
3192 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3196 for (idx = 0; ignored_signals[idx] != 0; idx++)
3198 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3200 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3205 #else /* ifdef _WIN32 */
3206 # ifdef _WIN_CONSOLE
3208 * We *are* in a windows console app.
3209 * Print a verbose messages about FAQ's and such
3211 printf("%s", win32_blurb);
3212 # endif /* def _WIN_CONSOLE */
3213 #endif /* def _WIN32 */
3216 /* Initialize the CGI subsystem */
3217 cgi_init_error_messages();
3220 * If runnig on unix and without the --nodaemon
3221 * option, become a daemon. I.e. fork, detach
3222 * from tty and get process group leadership
3235 if ( pid < 0 ) /* error */
3240 else if ( pid != 0 ) /* parent */
3245 * must check for errors
3246 * child died due to missing files aso
3249 wpid = waitpid( pid, &status, WNOHANG );
3258 /* Should be more portable, but not as well tested */
3263 #else /* ndef __FreeBSD__ */
3265 #endif /* ndef __FreeBSD__ */
3266 fd = open("/dev/tty", O_RDONLY);
3269 /* no error check here */
3270 ioctl( fd, TIOCNOTTY,0 );
3275 * stderr (fd 2) will be closed later on, when the
3276 * log file has been parsed.
3283 } /* -END- if (!no_daemon) */
3286 * As soon as we have written the PID file, we can switch
3287 * to the user and group ID indicated by the --user option
3293 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3295 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3301 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3303 /* Read the time zone file from /etc before doing chroot. */
3305 if (NULL != pre_chroot_nslookup_to_load_resolver
3306 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3308 /* Initialize resolver library. */
3309 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3311 if (chroot(pw->pw_dir) < 0)
3313 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3317 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3320 if (setuid(pw->pw_uid))
3322 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3326 char putenv_dummy[64];
3328 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3329 if (putenv(putenv_dummy) != 0)
3331 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3334 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3335 if (putenv(putenv_dummy) != 0)
3337 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3343 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3346 #endif /* defined unix */
3349 /* This will be FALSE unless the command line specified --service
3353 /* Yup, so now we must attempt to establish a connection
3354 * with the service dispatcher. This will only work if this
3355 * process was launched by the service control manager to
3356 * actually run as a service. If this isn't the case, i've
3357 * known it take around 30 seconds or so for the call to return.
3360 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3361 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3363 /* Service has run, and at this point is now being stopped, so just return */
3368 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3370 /* An error occurred. Usually it's because --service was wrongly specified
3371 * and we were unable to connect to the Service Control Dispatcher because
3372 * it wasn't expecting us and is therefore not listening.
3374 * For now, just continue below to call the listen_loop function.
3377 #endif /* def _WIN32 */
3387 /*********************************************************************
3389 * Function : bind_port_helper
3391 * Description : Bind the listen port. Handles logging, and aborts
3395 * 1 : config = Privoxy configuration. Specifies port
3398 * Returns : Port that was opened.
3400 *********************************************************************/
3401 static jb_socket bind_port_helper(struct configuration_spec * config)
3406 if ( (config->haddr != NULL)
3407 && (config->haddr[0] == '1')
3408 && (config->haddr[1] == '2')
3409 && (config->haddr[2] == '7')
3410 && (config->haddr[3] == '.') )
3412 log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
3415 else if (config->haddr == NULL)
3417 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3422 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3423 config->hport, config->haddr);
3426 result = bind_port(config->haddr, config->hport, &bfd);
3433 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3434 "There may be another Privoxy or some other "
3435 "proxy running on port %d",
3436 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3437 config->hport, config->hport);
3440 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3441 "The hostname is not resolvable",
3442 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3445 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3446 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3449 /* shouldn't get here */
3450 return JB_INVALID_SOCKET;
3453 config->need_bind = 0;
3460 /* Without this simple workaround we get this compiler warning from _beginthread
3461 * warning C4028: formal parameter 1 different from declaration
3463 void w32_service_listen_loop(void *p)
3467 #endif /* def _WIN32 */
3470 /*********************************************************************
3472 * Function : listen_loop
3474 * Description : bind the listen port and enter a "FOREVER" listening loop.
3480 *********************************************************************/
3481 static void listen_loop(void)
3483 struct client_state *csp = NULL;
3485 struct configuration_spec * config;
3487 config = load_config();
3489 bfd = bind_port_helper(config);
3491 #ifdef FEATURE_GRACEFUL_TERMINATION
3492 while (!g_terminate)
3497 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3498 while (waitpid(-1, NULL, WNOHANG) > 0)
3500 /* zombie children */
3502 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3505 * Free data that was used by died threads
3511 * Re-open the errlog after HUP signal
3513 if (received_hup_signal)
3515 init_error_log(Argv[0], config->logfile);
3516 received_hup_signal = 0;
3521 #ifdef FEATURE_COOKIE_JAR
3523 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3524 * already open. I think unload_configfile() is not being run, which should do
3525 * this work. Until that can get resolved, we'll use this workaround.
3529 if (csp->config->jar)
3531 fclose(csp->config->jar);
3532 csp->config->jar = NULL;
3534 #endif /* FEATURE_COOKIE_JAR */
3535 #endif /* __OS2__ */
3537 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3539 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3543 csp->flags |= CSP_FLAG_ACTIVE;
3544 csp->sfd = JB_INVALID_SOCKET;
3546 csp->config = config = load_config();
3548 if ( config->need_bind )
3551 * Since we were listening to the "old port", we will not see
3552 * a "listen" param change until the next IJB request. So, at
3553 * least 1 more request must be made for us to find the new
3554 * setting. I am simply closing the old socket and binding the
3557 * Which-ever is correct, we will serve 1 more page via the
3558 * old settings. This should probably be a "show-proxy-args"
3559 * request. This should not be a so common of an operation
3560 * that this will hurt people's feelings.
3565 bfd = bind_port_helper(config);
3568 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3570 if (!accept_connection(csp, bfd))
3572 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3585 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3588 #ifdef FEATURE_TOGGLE
3589 if (global_toggle_state)
3590 #endif /* def FEATURE_TOGGLE */
3592 csp->flags |= CSP_FLAG_TOGGLED_ON;
3595 if (run_loader(csp))
3597 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3598 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3602 if (block_acl(NULL,csp))
3604 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3605 close_socket(csp->cfd);
3609 #endif /* def FEATURE_ACL */
3611 /* add it to the list of clients */
3612 csp->next = clients->next;
3613 clients->next = csp;
3615 if (config->multi_threaded)
3619 /* this is a switch () statment in the C preprocessor - ugh */
3620 #undef SELECTED_ONE_OPTION
3622 /* Use Pthreads in preference to native code */
3623 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3624 #define SELECTED_ONE_OPTION
3626 pthread_t the_thread;
3627 pthread_attr_t attrs;
3629 pthread_attr_init(&attrs);
3630 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3631 errno = pthread_create(&the_thread, &attrs,
3632 (void * (*)(void *))serve, csp);
3633 child_id = errno ? -1 : 0;
3634 pthread_attr_destroy(&attrs);
3638 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3639 #define SELECTED_ONE_OPTION
3640 child_id = _beginthread(
3641 (void (*)(void *))serve,
3646 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3647 #define SELECTED_ONE_OPTION
3648 child_id = _beginthread(
3649 (void(* _Optlink)(void*))serve,
3655 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3656 #define SELECTED_ONE_OPTION
3658 thread_id tid = spawn_thread
3659 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3661 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3663 child_id = (int) tid;
3672 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3673 #define SELECTED_ONE_OPTION
3674 csp->cfd = ReleaseSocket(csp->cfd, -1);
3677 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3678 NP_Output, Output(),
3679 NP_CloseOutput, FALSE,
3680 NP_Name, (ULONG)"privoxy child",
3684 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3685 NP_Output, Output(),
3686 NP_CloseOutput, FALSE,
3687 NP_Name, (ULONG)"privoxy child",
3688 NP_StackSize, 200*1024,
3694 ((struct Task *)child_id)->tc_UserData = csp;
3695 Signal((struct Task *)child_id, SIGF_SINGLE);
3700 #if !defined(SELECTED_ONE_OPTION)
3703 /* This block is only needed when using fork().
3704 * When using threads, the server thread was
3705 * created and run by the call to _beginthread().
3707 if (child_id == 0) /* child */
3710 #ifdef FEATURE_TOGGLE
3711 int inherited_toggle_state = global_toggle_state;
3712 #endif /* def FEATURE_TOGGLE */
3717 * If we've been toggled or we've blocked the request, tell Mom
3720 #ifdef FEATURE_TOGGLE
3721 if (inherited_toggle_state != global_toggle_state)
3723 rc |= RC_FLAG_TOGGLED;
3725 #endif /* def FEATURE_TOGGLE */
3727 #ifdef FEATURE_STATISTICS
3728 if (csp->flags & CSP_FLAG_REJECTED)
3730 rc |= RC_FLAG_BLOCKED;
3732 #endif /* ndef FEATURE_STATISTICS */
3736 else if (child_id > 0) /* parent */
3738 /* in a fork()'d environment, the parent's
3739 * copy of the client socket and the CSP
3743 #if !defined(_WIN32) && !defined(__CYGWIN__)
3745 wait( &child_status );
3748 * Evaluate child's return code: If the child has
3749 * - been toggled, toggle ourselves
3750 * - blocked its request, bump up the stats counter
3753 #ifdef FEATURE_TOGGLE
3754 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3756 global_toggle_state = !global_toggle_state;
3758 #endif /* def FEATURE_TOGGLE */
3760 #ifdef FEATURE_STATISTICS
3762 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3766 #endif /* def FEATURE_STATISTICS */
3768 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3769 close_socket(csp->cfd);
3770 csp->flags &= ~CSP_FLAG_ACTIVE;
3774 #undef SELECTED_ONE_OPTION
3775 /* end of cpp switch () */
3777 if (child_id < 0) /* failed */
3779 char buf[BUFFER_SIZE];
3781 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3783 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3785 write_socket(csp->cfd, buf, strlen(buf));
3786 close_socket(csp->cfd);
3787 csp->flags &= ~CSP_FLAG_ACTIVE;
3798 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3800 /* Clean up. Aim: free all memory (no leaks) */
3801 #ifdef FEATURE_GRACEFUL_TERMINATION
3803 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3805 unload_current_config_file();
3806 unload_current_actions_file();
3807 unload_current_re_filterfile();
3808 #ifdef FEATURE_TRUST
3809 unload_current_trust_file();
3812 if (config->multi_threaded)
3819 } while ((clients->next != NULL) && (--i > 0));
3823 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3834 #ifdef FEATURE_COOKIE_JAR
3835 if (NULL != config->jar)
3837 fclose(config->jar);
3841 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3842 /* Cleanup - remove taskbar icon etc. */
3847 #endif /* FEATURE_GRACEFUL_TERMINATION */