1 const char jcc_rcs[] = "$Id: jcc.c,v 1.165 2008/02/02 19:36:56 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/jcc.c,v $
6 * Purpose : Main file. Contains main() method, main loop, and
7 * the main connection-handling function.
9 * Copyright : Written by and Copyright (C) 2001-2007 the SourceForge
10 * Privoxy team. http://www.privoxy.org/
12 * Based on the Internet Junkbuster originally written
13 * by and Copyright (C) 1997 Anonymous Coders and
14 * Junkbusters Corporation. http://www.junkbusters.com
16 * This program is free software; you can redistribute it
17 * and/or modify it under the terms of the GNU General
18 * Public License as published by the Free Software
19 * Foundation; either version 2 of the License, or (at
20 * your option) any later version.
22 * This program is distributed in the hope that it will
23 * be useful, but WITHOUT ANY WARRANTY; without even the
24 * implied warranty of MERCHANTABILITY or FITNESS FOR A
25 * PARTICULAR PURPOSE. See the GNU General Public
26 * License for more details.
28 * The GNU General Public License should be included with
29 * this file. If not, you can view it at
30 * http://www.gnu.org/copyleft/gpl.html
31 * or write to the Free Software Foundation, Inc., 59
32 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
37 * Remove the "Listening ... for local connections only" log message.
38 * Whether or not remote connections are able to reach Privoxy is up
39 * to the operating system.
41 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
42 * Prevent the log messages for CONNECT requests to unacceptable
43 * ports from printing the limit-connect argument as [null] if
44 * limit-connect hasn't been explicitly enabled.
46 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
47 * Make sure all console-mode apps get a usage() instance
49 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
50 * Reword NO_SERVER_DATA_RESPONSE to make it harder
51 * to misunderstand what the message is all about.
53 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
54 * Unbreak trustfile which previously didn't work without
55 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
57 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
58 * Plug memory leak. Spotted by Valgrind, triggered by
59 * Privoxy-Regression-Test feeding proxyfuzz.py.
61 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
62 * In the HTTP snipplets, refer to the client as client.
64 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
65 * Emit a log message when activating the MS IIS5 hack.
67 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
68 * Log the "weak randomization factor" warning only
69 * once for mingw32 and provide some more details.
71 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
72 * Initialize log module after initializing mutexes, future
73 * deadlocks in that code should now work cross-platform.
75 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
76 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
77 * Reported by Bert van Leeuwen in BR#1818808.
79 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
80 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
82 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
83 * When in daemon mode, close stderr after the configuration file has been
84 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
86 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
87 * - Fix a crash when parsing invalid requests whose first header
88 * is rejected by get_header(). Regression (re?)introduced
89 * in r1.143 by yours truly.
90 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
91 * client_cookie_adder() to make sure send-vanilla-wafer can be
92 * controlled through tags (and thus regression-tested).
94 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
95 * - Move get_filter_function() from jcc.c to filters.c
96 * so the filter functions can be static.
97 * - Don't bother filtering body-less responses.
99 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
100 * Execute content filters through execute_content_filter().
102 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
103 * Initialize req to NULL to make sure it's defined if the
104 * first read_socket() call fails. Reported by icmp30.
106 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
107 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
108 * extensive comments moved to user manual.
110 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
111 * Don't crash if a broken header filter wiped out the request line.
113 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
114 * Fix byte_count calculation in case of flushes
115 * and don't parse the server headers a second time.
117 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
118 * - If there's a connection problem after we already forwarded
119 * parts of the original content, just hang up. Fixes BR#1776724.
120 * - Fix warnings about unused code on mingw32.
121 * - In case of flushes, calculate the byte count
122 * less incorrectly (I think).
124 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
125 * Add some more prototypes for static functions.
127 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
128 * Comment out request_contains_null_bytes() until it's used again.
130 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
131 * #1763173 from Stefan Huehner: s@const static@static const@
132 * and declare some more functions static.
134 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
135 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
136 * and explain why they were rejected in the first place.
137 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
138 * CONNECT requests. The request line was missing.
139 * - Add two more XXX reminders as we don't have enough already.
141 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
142 * As Hal noticed, checking dispatch_cgi() as the last cruncher
143 * looks like a bug if CGI requests are blocked unintentionally,
144 * so don't do it unless the user enabled the new config option
145 * "allow-cgi-request-crunching".
147 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
148 * - Allow to rewrite the request destination behind the client's back.
149 * - Turn the weird-looking unconditional for loop that
150 * reads the client request into a conditional while loop.
151 * Move the stuff that only runs once out of the loop.
152 * - Move parts of chat(), server_content_type() and the
153 * necessary stuff to fix BR#1750917 into get_filter_function().
155 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
156 * Temporary workaround for BR#1730105.
158 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
159 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
160 * deadlocks and crashes on OpenBSD and possibly other OS with neither
161 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
162 * Thanks to Ralf Horstmann for report and solution.
164 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
165 * Add forward-override{} to change the forwarding settings through
166 * action sections. This is mainly interesting to forward different
167 * clients differently (for example based on User-Agent or request
170 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
171 * - Let usage() mention the --chroot parameter.
172 * - Use read_socket() consistently and always leave
173 * the last buffer byte alone, even in cases where
174 * null termination (currently) doesn't matter.
176 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
177 * - Fix config file loading on Unix if no config file is specified.
178 * Since r1.97 Privoxy would always interpret the last argument as
179 * config file, even if it's a valid command line option.
180 * - Abort in case of unrecognized command line options. Closes #1719696.
181 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
182 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
184 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
185 * - Don't rerun crunchers that only depend on the request URL.
186 * - Don't count redirects and CGI requests as "blocked requests".
188 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
189 * Support crunching based on tags created by server-header taggers.
191 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
192 * Make HTTP snippets static (again). Add a Content-Type for those
193 * with content so the browser doesn't guess it based on the URL.
195 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
196 * Move crunching and request line rebuilding out of chat().
198 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
199 * Introduce tags as alternative way to specify which
200 * actions apply to a request. At the moment tags can be
201 * created based on client and server headers.
203 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
204 * Don't CLF-log CONNECT requests twice.
206 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
207 * Log the source address for ACL-related connection drops.
209 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
210 * New config option: enforce-blocks.
212 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
213 * - Move null byte check into separate function.
214 * - Don't confuse the client with error pages
215 * if a CONNECT request was already confirmed.
217 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
218 * Speed up NULL byte escaping and only log the complete
219 * NULL byte requests with header debugging enabled.
221 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
222 * Answer requests that contain NULL bytes with
223 * a custom response instead of waiting for more
224 * data until the client eventually hangs up.
226 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
227 * - Move delivery and logging of crunched responses
228 * from chat() into send_crunch_response().
229 * - Display the reason for generating http_responses.
230 * - Log the content length for LOG_LEVEL_CLF correctly
231 * (still incorrect for some fixed responses).
232 * - Reword an incorrect comment about
233 * treat-forbidden-connects-like-blocks violating
235 * - Add some log messages.
237 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
238 * Move mutex initialization into separate
239 * function and exit in case of errors.
241 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
242 * - Start to reduce chat()'s line count and move
243 * parts of it into separate functions.
244 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
246 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
247 * - Add Proxy-Agent header to HTTP snippets that are
248 * supposed to reach HTTP clients only.
249 * - Made a few CONNECT log messages more descriptive.
250 * - Catch completely empty server responses (as seen
251 * with Tor's fake ".noconnect" top level domain).
252 * - Use shiny new "forwarding-failed" template for socks errors.
254 * Revision 1.118 2007/01/07 07:43:43 joergs
255 * AmigaOS4 support added.
257 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
258 * Added config option accept-intercepted-requests
259 * and disabled it by default.
261 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
262 * Reverted parts of my last commit
263 * to keep error handling working.
265 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
266 * Fixed gcc43 conversion warnings.
268 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
269 * Fix -pedantic ISO C warning about converting
270 * from function pointer to object pointer.
272 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
273 * Silence compiler warning I introduced with my last commit.
275 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
276 * Mutex protect rand() if POSIX threading
277 * is used, warn the user if that's not possible
278 * and stop using it on _WIN32 where it could
281 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
282 * Don't prevent core dumps by catching SIGABRT.
283 * It's rude and makes debugging unreasonable painful.
285 * Revision 1.110 2006/12/13 14:52:53 etresoft
286 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
288 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
289 * Privoxy is now able to run as intercepting
290 * proxy in combination with any packet filter
291 * that does the port redirection. The destination
292 * is extracted from the "Host:" header which
293 * should be available for nearly all requests.
295 * Moved HTTP snipplets into jcc.c.
296 * Added error message for gopher proxy requests.
298 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
299 * Only unlink the pidfile if it's actually used.
301 * Change order of interception checks to make
302 * it possible to block or redirect requests for
305 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
306 * Make pthread mutex locking more generic. Instead of
307 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
308 * and use mutex locking unless there is an _r function
309 * available. Better safe than sorry.
311 * Fixes "./configure --disable-pthread" and should result
312 * in less threading-related problems on pthread-using platforms,
313 * but it still doesn't fix BR#1122404.
315 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
316 * Move pthread.h inclusion from jcc.c to jcc.h.
317 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
319 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
320 * Don't exit after receiving the second SIGHUP on Solaris.
322 * Fixes BR 1052235, but the same problem may exist on other
323 * systems. Once 3.0.6 is out we should use sigset()
324 * where available and see if it breaks anything.
326 * Revision 1.104 2006/09/23 13:26:38 roro
327 * Replace TABs by spaces in source code.
329 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
330 * Fix +redirect{}. Didn't work with -fast-redirects.
332 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
333 * Respond with 400 and a short text message
334 * if the client tries to use Privoxy as FTP proxy.
336 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
337 * Make number of retries in case of forwarded-connect problems
338 * a config file option (forwarded-connect-retries) and use 0 as
341 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
342 * Set random(3) seed.
344 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
345 * Follow the OpenBSD port's lead and protect the resolve
346 * functions on OpenBSD as well.
348 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
349 * --user fix. Only use the user as group if no group is specified.
350 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
352 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
353 * Windows service (re-)integration
357 * --install[:service_name]
358 * --uninstall[:service_name]
361 * They work as follows:
362 * --install will create a service for you and then terminate.
363 * By default the service name will be "privoxy" (without the quotes).
364 * However you can run multiple services if you wish, just by adding
365 * a colon and then a name (no spaces).
367 * --uninstall follows the exact same rules a --install.
369 * --service is used when the program is executed by the service
370 * control manager, and in normal circumstances would never be
371 * used as a command line argument.
373 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
374 * Windows service integration
376 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
377 * Incorporate Fabian Keil's patch work:
378 http://www.fabiankeil.de/sourcecode/privoxy/
380 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
381 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
382 * with what was really the latest development (the v_3_0_branch branch)
384 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
385 * Thanks to Jindrich Makovicka for a race condition fix for the log
386 * file. The race condition remains for non-pthread implementations.
387 * Reference patch #1175720.
389 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
390 * Add the ability to check jpeg images for invalid
391 * lengths of comment blocks. Defensive strategy
392 * against the exploit:
393 * Microsoft Security Bulletin MS04-028
394 * Buffer Overrun in JPEG Processing (GDI+) Could
395 * Allow Code Execution (833987)
396 * Enabled with +inspect-jpegs in actions files.
398 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
399 * - Fixed usage info for non-unix platforms
400 * - Fixed small cmdline parsing bug
402 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
403 * Diagnostics: Now preserve the returncode of pthread_create
404 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
406 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
407 * No longer ignore SIGCHLD. Fixes bug #769381
409 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
410 * Close jarfile on graceful exit, remove stray line
412 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
413 * Cosmetics: Killed a warning, a typo and an allocation left at exit
415 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
416 * No longer rely on non-POSIX.1 extensions of getcwd().
419 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
420 * Replaced setenv() by posix-compliant putenv()
421 * Thanks to Neil McCalden (nmcc AT users.sf.net).
423 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
424 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
426 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
427 * Clean-up and extension of improvements for forked mode:
428 * - Child's return code now consists of flags RC_FLAG_*
429 * - Reporting toggle to parent now properly #ifdef'ed
430 * - Children now report blocking to parent. This enables
431 * statistics in forked mode
433 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
434 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
435 * Children now report having been toggled through _exit(17), parents
436 * watch for that code and toggle themselves if found.
438 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
439 * Wrapping all *_r functions (the non-_r versions of them) with
440 * mutex semaphores for OSX. Hopefully this will take care of all
441 * of those pesky crash reports.
443 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
444 * Fixed two mostly harmless mem leaks
446 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
447 * Fix: Head of global clients list now initialized to NULL
449 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
450 * Added basic support for OPTIONS and TRACE HTTP methods:
451 * - New interceptor direct_response() added in chat().
452 * - sed() moved to earlier in the process, so that the
453 * Host: header is evaluated before actions and forwarding
456 * Revision 1.92 2002/05/08 16:00:46 oes
457 * Chat's buffer handling:
458 * - Fixed bug with unchecked out-of-mem conditions
459 * while reading client request & server headers
460 * - No longer predict if the buffer limit will be exceeded
461 * in the next read -- check add_to_iob's new
462 * return code. If buffer couldn't be extended
463 * (policy or out-of-mem) while
464 * - reading from client: abort
465 * - reading server headers: send error page
466 * - buffering server body for filter: flush,
467 * and if that fails: send error page
469 * Revision 1.91 2002/04/08 20:35:58 swa
472 * Revision 1.90 2002/04/02 14:57:28 oes
473 * Made sending wafers independent of FEATURE_COOKIE_JAR
475 * Revision 1.89 2002/03/31 17:18:59 jongfoster
476 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
478 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
479 * More compiler warning message maintenance
481 * Revision 1.87 2002/03/26 22:29:54 swa
482 * we have a new homepage!
484 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
485 * Workaround for closing the jarfile before load_config() comes around again
487 * Revision 1.85 2002/03/24 15:23:33 jongfoster
490 * Revision 1.84 2002/03/24 13:25:43 swa
491 * name change related issues
493 * Revision 1.83 2002/03/16 23:54:06 jongfoster
494 * Adding graceful termination feature, to help look for memory leaks.
495 * If you enable this (which, by design, has to be done by hand
496 * editing config.h) and then go to http://i.j.b/die, then the program
497 * will exit cleanly after the *next* request. It should free all the
498 * memory that was used.
500 * Revision 1.82 2002/03/13 00:27:05 jongfoster
503 * Revision 1.81 2002/03/12 01:42:50 oes
504 * Introduced modular filters
506 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
507 * OS/2 port maintenance:
508 * - Fixed EMX build - it had decayed a little
509 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
510 * substituted a memset for now.
512 * Revision 1.79 2002/03/09 20:03:52 jongfoster
513 * - Making various functions return int rather than size_t.
514 * (Undoing a recent change). Since size_t is unsigned on
515 * Windows, functions like read_socket that return -1 on
516 * error cannot return a size_t.
518 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
519 * crashes, and also frequently caused JB to jump to 100%
520 * CPU and stay there. (Because it thought it had just
521 * read ((unsigned)-1) == 4Gb of data...)
523 * - The signature of write_socket has changed, it now simply
524 * returns success=0/failure=nonzero.
526 * - Trying to get rid of a few warnings --with-debug on
527 * Windows, I've introduced a new type "jb_socket". This is
528 * used for the socket file descriptors. On Windows, this
529 * is SOCKET (a typedef for unsigned). Everywhere else, it's
530 * an int. The error value can't be -1 any more, so it's
531 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
532 * Windows it maps to the #define INVALID_SOCKET.)
534 * - The signature of bind_port has changed.
536 * Revision 1.78 2002/03/08 21:35:04 oes
537 * Added optional group supplement to --user option. Will now use default group of user if no group given
539 * Revision 1.77 2002/03/07 03:52:06 oes
540 * - Fixed compiler warnings etc
541 * - Improved handling of failed DNS lookups
543 * Revision 1.76 2002/03/06 22:54:35 jongfoster
544 * Automated function-comment nitpicking.
546 * Revision 1.75 2002/03/06 10:02:19 oes
547 * Fixed stupid bug when --user was not given
549 * Revision 1.74 2002/03/06 00:49:31 jongfoster
550 * Fixing warning on Windows
551 * Making #ifdefs that refer to the same variable consistently
552 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
554 * Revision 1.73 2002/03/05 23:57:30 hal9
555 * Stray character 's' on line 1618 was breaking build.
557 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
558 * - Re-enable OS/2 building after new parms were added
559 * - Fix false out of memory report when resolving CGI templates when no IP
560 * address is available of failed attempt (a la no such domain)
562 * Revision 1.71 2002/03/05 18:13:56 oes
563 * Added --user option
565 * Revision 1.70 2002/03/05 04:52:42 oes
566 * Deleted non-errlog debugging code
568 * Revision 1.69 2002/03/04 23:50:00 jongfoster
569 * Splitting off bind_port() call into bind_port_helper(), with
572 * Revision 1.68 2002/03/04 20:17:32 oes
575 * Revision 1.67 2002/03/04 18:18:57 oes
576 * - Removed _DEBUG mode
577 * - Cleand up cmdline parsing
578 * - Introduced --no-daemon, --pidfile options
579 * - Cleaned up signal handling:
580 * - Terminate cleanly on INT, TERM and ABRT
581 * - Schedule logfile for re-opening on HUP
582 * - Ignore CHLD and PIPE
583 * - Leave the rest with their default handlers
584 * - Uniform handler registration
585 * - Added usage() function
586 * - Played styleguide police
588 * Revision 1.66 2002/03/03 15:06:55 oes
589 * Re-enabled automatic config reloading
591 * Revision 1.65 2002/03/03 14:49:11 oes
592 * Fixed CLF logging: Now uses client's original HTTP request
594 * Revision 1.64 2002/03/03 09:18:03 joergs
595 * Made jumbjuster work on AmigaOS again.
597 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
598 * Clean up a little CRLF unpleasantness that suddenly appeared
600 * Revision 1.62 2002/02/20 23:17:23 jongfoster
601 * Detecting some out-of memory conditions and exiting with a log message.
603 * Revision 1.61 2002/01/17 21:01:52 jongfoster
604 * Moving all our URL and URL pattern parsing code to urlmatch.c.
606 * Revision 1.60 2001/12/30 14:07:32 steudten
607 * - Add signal handling (unix)
608 * - Add SIGHUP handler (unix)
609 * - Add creation of pidfile (unix)
610 * - Add action 'top' in rc file (RH)
611 * - Add entry 'SIGNALS' to manpage
612 * - Add exit message to logfile (unix)
614 * Revision 1.59 2001/12/13 14:07:18 oes
615 * Fixed Bug: 503 error page now sent OK
617 * Revision 1.58 2001/11/30 23:37:24 jongfoster
618 * Renaming the Win32 config file to config.txt - this is almost the
619 * same as the corresponding UNIX name "config"
621 * Revision 1.57 2001/11/16 00:47:43 jongfoster
622 * Changing the tty-disconnection code to use setsid().
624 * Revision 1.56 2001/11/13 20:20:54 jongfoster
625 * Tabs->spaces, fixing a bug with missing {} around an if()
627 * Revision 1.55 2001/11/13 20:14:53 jongfoster
628 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
630 * Revision 1.54 2001/11/07 00:03:14 steudten
631 * Give reliable return value if an error
632 * occurs not just 0 with new daemon mode.
634 * Revision 1.53 2001/11/05 21:41:43 steudten
635 * Add changes to be a real daemon just for unix os.
636 * (change cwd to /, detach from controlling tty, set
637 * process group and session leader to the own process.
639 * Add some fatal-error log message for failed malloc().
640 * Add '-d' if compiled with 'configure --with-debug' to
641 * enable debug output.
643 * Revision 1.52 2001/10/26 20:11:20 jongfoster
644 * Fixing type mismatch
646 * Revision 1.51 2001/10/26 17:38:28 oes
649 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
650 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
651 * threads to call select() simultaneously. So, it's time to do a real, live,
652 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
653 * (native). Both versions will work, but using __OS2__ offers multi-threading.
655 * Revision 1.49 2001/10/23 21:41:35 jongfoster
656 * Added call to initialize the (statically-allocated of course)
657 * "out of memory" CGI response.
659 * Revision 1.48 2001/10/10 19:56:46 jongfoster
660 * Moving some code that wasn't cookie-related out of an #ifdef
663 * Revision 1.47 2001/10/10 16:44:36 oes
664 * Added CONNECT destination port limitation check
666 * Revision 1.46 2001/10/08 15:17:41 oes
667 * Re-enabled SSL forwarding
669 * Revision 1.45 2001/10/07 15:42:11 oes
670 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
672 * Moved downgrading of the HTTP version from parse_http_request to
673 * chat(), since we can't decide if it is necessary before we have
674 * determined the actions for the URL. The HTTP command is now
675 * *always* re-built so the repairs need no longer be special-cased.
677 * filter_popups now gets a csp pointer so it can raise the new
678 * CSP_FLAG_MODIFIED flag.
682 * Added configurable size limit for the IOB. If the IOB grows so
683 * large that the next read would exceed the limit, the header
684 * is generated, and the header & unfiltered buffer are flushed
685 * to the client. Chat then continues in non-buffering,
686 * non-filtering body mode.
688 * Revision 1.44 2001/10/02 18:13:57 oes
691 * Revision 1.43 2001/10/02 15:32:13 oes
692 * Moved generation of hdr
694 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
695 * Cleaning up 2 compiler warnings on OS/2.
697 * Revision 1.41 2001/09/16 17:05:14 jongfoster
698 * Removing unused #include showarg.h
700 * Revision 1.40 2001/09/16 15:41:45 jongfoster
701 * Fixing signed/unsigned comparison warning.
703 * Revision 1.39 2001/09/16 13:21:27 jongfoster
704 * Changes to use new list functions.
706 * Revision 1.38 2001/09/16 13:01:46 jongfoster
707 * Removing redundant function call that zeroed zalloc()'d memory.
709 * Revision 1.37 2001/09/10 11:12:24 oes
710 * Deleted unused variable
712 * Revision 1.36 2001/09/10 10:56:15 oes
713 * Silenced compiler warnings
715 * Revision 1.35 2001/07/31 14:44:22 oes
716 * Deleted unused size parameter from filter_popups()
718 * Revision 1.34 2001/07/30 22:08:36 jongfoster
719 * Tidying up #defines:
720 * - All feature #defines are now of the form FEATURE_xxx
721 * - Permanently turned off WIN_GUI_EDIT
722 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
724 * Revision 1.33 2001/07/29 19:32:00 jongfoster
725 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
727 * Revision 1.32 2001/07/29 18:47:05 jongfoster
728 * Adding missing #include "loadcfg.h"
730 * Revision 1.31 2001/07/29 12:17:48 oes
731 * Applied pthread fix by Paul Lieverse
733 * Revision 1.30 2001/07/25 22:57:13 jongfoster
734 * __BEOS__ no longer overrides FEATURE_PTHREAD.
735 * This is because FEATURE_PTHREAD will soon be widely used, so I
736 * want to keep it simple.
738 * Revision 1.29 2001/07/24 12:47:06 oes
739 * Applied BeOS support update by Eugenia
741 * Revision 1.28 2001/07/23 13:26:12 oes
742 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
744 * Revision 1.27 2001/07/19 19:09:47 haroon
745 * - Added code to take care of the situation where while processing the first
746 * server response (which includes the server header), after finding the end
747 * of the headers we were not looking past the end of the headers for
748 * content modification. I enabled it for filter_popups.
749 * Someone else should look to see if other similar operations should be
750 * done to the discarded portion of the buffer.
752 * Note 2001/07/20: No, the other content modification mechanisms will process
753 * the whole iob later anyway. --oes
755 * Revision 1.26 2001/07/18 12:31:36 oes
758 * Revision 1.25 2001/07/15 19:43:49 jongfoster
759 * Supports POSIX threads.
760 * Also removed some unused #includes.
762 * Revision 1.24 2001/07/13 14:00:40 oes
763 * - Generic content modification scheme:
764 * Each feature has its own applicability flag that is set
765 * from csp->action->flags.
766 * Replaced the "filtering" int flag , by a function pointer
767 * "content_filter" to the function that will do the content
768 * modification. If it is != NULL, the document will be buffered
769 * and processed through *content_filter, which must set
770 * csp->content_length and return a modified copy of the body
771 * or return NULL (on failiure).
772 * - Changed csp->is_text to the more generic bitmap csp->content_type
773 * which can currently take the valued CT_TEXT or CT_GIF
775 * - Removed all #ifdef PCRS
777 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
778 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
779 * the `block_acl' call. This prevents a compilation error when the user
780 * does not wish to use the "ACL" feature.
782 * Revision 1.22 2001/06/29 21:45:41 oes
783 * Indentation, CRLF->LF, Tab-> Space
785 * Revision 1.21 2001/06/29 13:29:36 oes
786 * - Cleaned up, improved comments
787 * - Unified all possible interceptors (CGI,
788 * block, trust, fast_redirect) in one
789 * place, with one (CGI) answer generation
790 * mechansim. Much clearer now.
791 * - Removed the GIF image generation, which
792 * is now done in filters.c:block_url()
793 * - Made error conditions like domain lookup
794 * failiure or (various) problems while talking
795 * to the server use cgi.c:error_response()
796 * instead of generating HTML/HTTP in chat() (yuck!)
797 * - Removed logentry from cancelled commit
799 * Revision 1.20 2001/06/09 10:55:28 jongfoster
800 * Changing BUFSIZ ==> BUFFER_SIZE
802 * Revision 1.19 2001/06/07 23:12:52 jongfoster
803 * Replacing function pointer in struct gateway with a directly
804 * called function forwarded_connect().
805 * Replacing struct gateway with struct forward_spec
807 * Revision 1.18 2001/06/03 19:12:16 oes
808 * introduced new cgi handling
810 * Revision 1.17 2001/06/01 20:07:23 jongfoster
811 * Now uses action +image-blocker{} rather than config->tinygif
813 * Revision 1.16 2001/06/01 18:49:17 jongfoster
814 * Replaced "list_share" with "list" - the tiny memory gain was not
815 * worth the extra complexity.
817 * Revision 1.15 2001/05/31 21:24:47 jongfoster
818 * Changed "permission" to "action" throughout.
819 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
820 * Moved vanilla wafer check into chat(), since we must now
821 * decide whether or not to add it based on the URL.
823 * Revision 1.14 2001/05/29 20:14:01 joergs
824 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
827 * Revision 1.13 2001/05/29 09:50:24 jongfoster
828 * Unified blocklist/imagelist/permissionslist.
829 * File format is still under discussion, but the internal changes
832 * Also modified interceptor behaviour:
833 * - We now intercept all URLs beginning with one of the following
834 * prefixes (and *only* these prefixes):
836 * * http://ijbswa.sf.net/config/
837 * * http://ijbswa.sourceforge.net/config/
838 * - New interceptors "home page" - go to http://i.j.b/ to see it.
839 * - Internal changes so that intercepted and fast redirect pages
840 * are not replaced with an image.
841 * - Interceptors now have the option to send a binary page direct
842 * to the client. (i.e. ijb-send-banner uses this)
843 * - Implemented show-url-info interceptor. (Which is why I needed
844 * the above interceptors changes - a typical URL is
845 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
846 * The previous mechanism would not have intercepted that, and
847 * if it had been intercepted then it then it would have replaced
850 * Revision 1.12 2001/05/27 22:17:04 oes
852 * - re_process_buffer no longer writes the modified buffer
853 * to the client, which was very ugly. It now returns the
854 * buffer, which it is then written by chat.
856 * - content_length now adjusts the Content-Length: header
857 * for modified documents rather than crunch()ing it.
858 * (Length info in csp->content_length, which is 0 for
859 * unmodified documents)
861 * - For this to work, sed() is called twice when filtering.
863 * Revision 1.11 2001/05/26 17:27:53 jongfoster
864 * Added support for CLF and fixed LOG_LEVEL_LOG.
865 * Also did CRLF->LF fix of my previous patch.
867 * Revision 1.10 2001/05/26 15:26:15 jongfoster
868 * ACL feature now provides more security by immediately dropping
869 * connections from untrusted hosts.
871 * Revision 1.9 2001/05/26 00:28:36 jongfoster
872 * Automatic reloading of config file.
873 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
874 * Most of the global variables have been moved to a new
875 * struct configuration_spec, accessed through csp->config->globalname
876 * Most of the globals remaining are used by the Win32 GUI.
878 * Revision 1.8 2001/05/25 22:43:18 jongfoster
879 * Fixing minor memory leak and buffer overflow.
881 * Revision 1.7 2001/05/25 22:34:30 jongfoster
884 * Revision 1.6 2001/05/23 00:13:58 joergs
885 * AmigaOS support fixed.
887 * Revision 1.5 2001/05/22 18:46:04 oes
889 * - Enabled filtering banners by size rather than URL
890 * by adding patterns that replace all standard banner
891 * sizes with the "Junkbuster" gif to the re_filterfile
893 * - Enabled filtering WebBugs by providing a pattern
894 * which kills all 1x1 images
896 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
897 * which is selected by the (nonstandard and therefore
898 * capital) letter 'U' in the option string.
899 * It causes the quantifiers to be ungreedy by default.
900 * Appending a ? turns back to greedy (!).
902 * - Added a new interceptor ijb-send-banner, which
903 * sends back the "Junkbuster" gif. Without imagelist or
904 * MSIE detection support, or if tinygif = 1, or the
905 * URL isn't recognized as an imageurl, a lame HTML
906 * explanation is sent instead.
908 * - Added new feature, which permits blocking remote
909 * script redirects and firing back a local redirect
911 * The feature is conditionally compiled, i.e. it
912 * can be disabled with --disable-fast-redirects,
913 * plus it must be activated by a "fast-redirects"
914 * line in the config file, has its own log level
915 * and of course wants to be displayed by show-proxy-args
916 * Note: Boy, all the #ifdefs in 1001 locations and
917 * all the fumbling with configure.in and acconfig.h
918 * were *way* more work than the feature itself :-(
920 * - Because a generic redirect template was needed for
921 * this, tinygif = 3 now uses the same.
923 * - Moved GIFs, and other static HTTP response templates
928 * - Removed some >400 CRs again (Jon, you really worked
931 * Revision 1.4 2001/05/21 19:34:01 jongfoster
932 * Made failure to bind() a fatal error.
934 * Revision 1.3 2001/05/20 01:21:20 jongfoster
935 * Version 2.9.4 checkin.
936 * - Merged popupfile and cookiefile, and added control over PCRS
937 * filtering, in new "permissionsfile".
938 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
939 * file error you now get a message box (in the Win32 GUI) rather
940 * than the program exiting with no explanation.
941 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
943 * - Removed tabs from "config"
944 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
945 * - Bumped up version number.
947 * Revision 1.2 2001/05/17 22:34:44 oes
948 * - Added hint on GIF char array generation to jcc.c
949 * - Cleaned CRLF's from the sources and related files
950 * - Repaired logging for REF and FRC
952 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
953 * Initial import of version 2.9.3 source tree
956 *********************************************************************/
962 #include <sys/types.h>
971 # ifndef FEATURE_PTHREAD
975 # include <windows.h>
976 # include <process.h>
977 # endif /* ndef FEATURE_PTHREAD */
980 # ifndef _WIN_CONSOLE
982 # endif /* ndef _WIN_CONSOLE */
983 # include "w32svrapi.h"
985 #else /* ifndef _WIN32 */
987 # if !defined (__OS2__)
989 # include <sys/wait.h>
990 # endif /* ndef __OS2__ */
991 # include <sys/time.h>
992 # include <sys/stat.h>
993 # include <sys/ioctl.h>
996 #include <sys/termios.h>
1004 # include <signal.h>
1007 # include <socket.h> /* BeOS has select() for sockets only. */
1008 # include <OS.h> /* declarations for threads and stuff. */
1011 # if defined(__EMX__) || defined(__OS2__)
1012 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1017 #define bzero(B,N) memset(B,0x00,n)
1021 # include <select.h>
1026 #include "project.h"
1029 #include "filters.h"
1030 #include "loaders.h"
1031 #include "parsers.h"
1032 #include "killpopup.h"
1033 #include "miscutil.h"
1035 #include "jbsockets.h"
1036 #include "gateway.h"
1037 #include "actions.h"
1039 #include "loadcfg.h"
1040 #include "urlmatch.h"
1042 const char jcc_h_rcs[] = JCC_H_VERSION;
1043 const char project_h_rcs[] = PROJECT_H_VERSION;
1046 struct client_state clients[1];
1047 struct file_list files[1];
1049 #ifdef FEATURE_STATISTICS
1050 int urls_read = 0; /* total nr of urls read inc rejected */
1051 int urls_rejected = 0; /* total nr of urls rejected */
1052 #endif /* def FEATURE_STATISTICS */
1054 #ifdef FEATURE_GRACEFUL_TERMINATION
1055 int g_terminate = 0;
1058 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1059 static void sig_handler(int the_signal);
1061 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1062 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1063 static jb_err get_server_headers(struct client_state *csp);
1064 static const char *crunch_reason(const struct http_response *rsp);
1065 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1067 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1069 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1070 static jb_err change_request_destination(struct client_state *csp);
1071 static void chat(struct client_state *csp);
1072 static void serve(struct client_state *csp);
1073 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1074 static void usage(const char *myname);
1076 static void initialize_mutexes(void);
1077 static jb_socket bind_port_helper(struct configuration_spec *config);
1078 static void listen_loop(void);
1081 void serve(struct client_state *csp);
1082 #else /* ifndef AMIGA */
1083 static void serve(struct client_state *csp);
1084 #endif /* def AMIGA */
1087 static int32 server_thread(void *data);
1088 #endif /* def __BEOS__ */
1091 #define sleep(N) Sleep(((N) * 1000))
1095 #define sleep(N) DosSleep(((N) * 100))
1098 #ifdef FEATURE_PTHREAD
1099 pthread_mutex_t log_mutex;
1100 pthread_mutex_t log_init_mutex;
1102 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1103 pthread_mutex_t resolver_mutex;
1104 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1106 #ifndef HAVE_GMTIME_R
1107 pthread_mutex_t gmtime_mutex;
1108 #endif /* ndef HAVE_GMTIME_R */
1110 #ifndef HAVE_LOCALTIME_R
1111 pthread_mutex_t localtime_mutex;
1112 #endif /* ndef HAVE_GMTIME_R */
1115 pthread_mutex_t rand_mutex;
1116 #endif /* ndef HAVE_RANDOM */
1118 #endif /* FEATURE_PTHREAD */
1120 #if defined(unix) || defined(__EMX__)
1121 const char *basedir = NULL;
1122 const char *pidfile = NULL;
1123 int received_hup_signal = 0;
1124 #endif /* defined unix */
1126 /* HTTP snipplets. */
1127 static const char CSUCCEED[] =
1128 "HTTP/1.0 200 Connection established\r\n"
1129 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1131 static const char CHEADER[] =
1132 "HTTP/1.0 400 Invalid header received from client\r\n"
1133 "Proxy-Agent: Privoxy " VERSION "\r\n"
1134 "Content-Type: text/plain\r\n"
1135 "Connection: close\r\n\r\n"
1136 "Invalid header received from client.\r\n";
1138 static const char CFORBIDDEN[] =
1139 "HTTP/1.0 403 Connection not allowable\r\n"
1140 "Proxy-Agent: Privoxy " VERSION "\r\n"
1141 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1142 "Connection: close\r\n\r\n";
1144 static const char FTP_RESPONSE[] =
1145 "HTTP/1.0 400 Invalid request received from client\r\n"
1146 "Content-Type: text/plain\r\n"
1147 "Connection: close\r\n\r\n"
1148 "Invalid request. Privoxy doesn't support FTP.\r\n";
1150 static const char GOPHER_RESPONSE[] =
1151 "HTTP/1.0 400 Invalid request received from client\r\n"
1152 "Content-Type: text/plain\r\n"
1153 "Connection: close\r\n\r\n"
1154 "Invalid request. Privoxy doesn't support gopher.\r\n";
1156 /* XXX: should be a template */
1157 static const char MISSING_DESTINATION_RESPONSE[] =
1158 "HTTP/1.0 400 Bad request received from client\r\n"
1159 "Proxy-Agent: Privoxy " VERSION "\r\n"
1160 "Content-Type: text/plain\r\n"
1161 "Connection: close\r\n\r\n"
1162 "Bad request. Privoxy was unable to extract the destination.\r\n";
1164 /* XXX: should be a template */
1165 static const char NO_SERVER_DATA_RESPONSE[] =
1166 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1167 "Proxy-Agent: Privoxy " VERSION "\r\n"
1168 "Content-Type: text/plain\r\n"
1169 "Connection: close\r\n\r\n"
1170 "Empty server or forwarder response.\r\n"
1171 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1174 /* XXX: should be a template */
1175 static const char NULL_BYTE_RESPONSE[] =
1176 "HTTP/1.0 400 Bad request received from client\r\n"
1177 "Proxy-Agent: Privoxy " VERSION "\r\n"
1178 "Content-Type: text/plain\r\n"
1179 "Connection: close\r\n\r\n"
1180 "Bad request. Null byte(s) before end of request.\r\n";
1183 /* XXX: should be a template */
1184 static const char MESSED_UP_REQUEST_RESPONSE[] =
1185 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1186 "Proxy-Agent: Privoxy " VERSION "\r\n"
1187 "Content-Type: text/plain\r\n"
1188 "Connection: close\r\n\r\n"
1189 "Bad request. Messed up with header filters.\r\n";
1191 /* A function to crunch a response */
1192 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1194 /* Crunch function flags */
1195 #define CF_NO_FLAGS 0
1196 /* Cruncher applies to forced requests as well */
1197 #define CF_IGNORE_FORCE 1
1198 /* Crunched requests are counted for the block statistics */
1199 #define CF_COUNT_AS_REJECT 2
1201 /* A crunch function and its flags */
1204 const crunch_func_ptr cruncher;
1208 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1210 /* Complete list of cruncher functions */
1211 static const struct cruncher crunchers_all[] = {
1212 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1213 { block_url, CF_COUNT_AS_REJECT },
1214 #ifdef FEATURE_TRUST
1215 { trust_url, CF_COUNT_AS_REJECT },
1216 #endif /* def FEATURE_TRUST */
1217 { redirect_url, CF_NO_FLAGS },
1218 { dispatch_cgi, CF_IGNORE_FORCE},
1222 /* Light version, used after tags are applied */
1223 static const struct cruncher crunchers_light[] = {
1224 { block_url, CF_COUNT_AS_REJECT },
1225 { redirect_url, CF_NO_FLAGS },
1230 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1231 /*********************************************************************
1233 * Function : sig_handler
1235 * Description : Signal handler for different signals.
1236 * Exit gracefully on TERM and INT
1237 * or set a flag that will cause the errlog
1238 * to be reopened by the main thread on HUP.
1241 * 1 : the_signal = the signal cause this function to call
1245 *********************************************************************/
1246 static void sig_handler(int the_signal)
1252 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1263 received_hup_signal = 1;
1268 * We shouldn't be here, unless we catch signals
1269 * in main() that we can't handle here!
1271 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1279 /*********************************************************************
1281 * Function : client_protocol_is_unsupported
1283 * Description : Checks if the client used a known unsupported
1284 * protocol and deals with it by sending an error
1288 * 1 : csp = Current client state (buffers, headers, etc...)
1289 * 2 : req = the first request line send by the client
1291 * Returns : TRUE if an error response has been generated, or
1292 * FALSE if the request doesn't look invalid.
1294 *********************************************************************/
1295 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1297 char buf[BUFFER_SIZE];
1300 * If it's a FTP or gopher request, we don't support it.
1302 * These checks are better than nothing, but they might
1303 * not work in all configurations and some clients might
1304 * have problems digesting the answer.
1306 * They should, however, never cause more problems than
1307 * Privoxy's old behaviour (returning the misleading HTML
1310 * "Could not resolve http://(ftp|gopher)://example.org").
1312 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1314 if (!strncmpic(req, "GET ftp://", 10))
1316 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1317 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1318 csp->ip_addr_str, req);
1322 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1323 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1324 csp->ip_addr_str, req);
1326 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1328 write_socket(csp->cfd, buf, strlen(buf));
1337 /*********************************************************************
1339 * Function : get_request_destination_elsewhere
1341 * Description : If the client's request was redirected into
1342 * Privoxy without the client's knowledge,
1343 * the request line lacks the destination host.
1345 * This function tries to get it elsewhere,
1346 * provided accept-intercepted-requests is enabled.
1348 * "Elsewhere" currently only means "Host: header",
1349 * but in the future we may ask the redirecting
1350 * packet filter to look the destination up.
1352 * If the destination stays unknown, an error
1353 * response is send to the client and headers
1354 * are freed so that chat() can return directly.
1357 * 1 : csp = Current client state (buffers, headers, etc...)
1358 * 2 : headers = a header list
1360 * Returns : JB_ERR_OK if the destination is now known, or
1361 * JB_ERR_PARSE if it isn't.
1363 *********************************************************************/
1364 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1368 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1370 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1371 " Privoxy isn't configured to accept intercepted requests.",
1372 csp->ip_addr_str, csp->http->cmd);
1373 /* XXX: Use correct size */
1374 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1375 csp->ip_addr_str, csp->http->cmd);
1377 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1378 destroy_list(headers);
1380 return JB_ERR_PARSE;
1382 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1384 /* Split the domain we just got for pattern matching */
1385 init_domain_components(csp->http);
1391 /* We can't work without destination. Go spread the news.*/
1393 req = list_to_text(headers);
1395 /* XXX: Use correct size */
1396 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1397 csp->ip_addr_str, csp->http->cmd);
1398 log_error(LOG_LEVEL_ERROR,
1399 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1400 csp->ip_addr_str, csp->http->cmd, req);
1403 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1404 destroy_list(headers);
1406 return JB_ERR_PARSE;
1409 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1410 * to get the destination IP address, use it as host directly
1411 * or do a reverse DNS lookup first.
1416 /*********************************************************************
1418 * Function : get_server_headers
1420 * Description : Parses server headers in iob and fills them
1421 * into csp->headers so that they can later be
1425 * 1 : csp = Current client state (buffers, headers, etc...)
1427 * Returns : JB_ERR_OK if everything went fine, or
1428 * JB_ERR_PARSE if the headers were incomplete.
1430 *********************************************************************/
1431 static jb_err get_server_headers(struct client_state *csp)
1433 int continue_hack_in_da_house = 0;
1436 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1441 * continue hack in da house. Ignore the ending of
1442 * this head and continue enlisting header lines.
1443 * The reason is described below.
1445 enlist(csp->headers, "");
1446 continue_hack_in_da_house = 0;
1449 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1452 * It's a bodyless continue response, don't
1453 * stop header parsing after reaching it's end.
1455 * As a result Privoxy will concatenate the
1456 * next response's head and parse and deliver
1457 * the headers as if they belonged to one request.
1459 * The client will separate them because of the
1460 * empty line between them.
1462 * XXX: What we're doing here is clearly against
1463 * the intended purpose of the continue header,
1464 * and under some conditions (HTTP/1.0 client request)
1465 * it's a standard violation.
1467 * Anyway, "sort of against the spec" is preferable
1468 * to "always getting confused by Continue responses"
1469 * (Privoxy's behaviour before this hack was added)
1471 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1472 continue_hack_in_da_house = 1;
1474 else if (*header == '\0')
1477 * If the header is empty, but the Continue hack
1478 * isn't active, we can assume that we reached the
1479 * end of the buffer before we hit the end of the
1482 * Inform the caller an let it decide how to handle it.
1484 return JB_ERR_PARSE;
1488 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1491 * XXX: Should we quit the request and return a
1492 * out of memory error page instead?
1494 log_error(LOG_LEVEL_ERROR,
1495 "Out of memory while enlisting server headers. %s lost.",
1505 /*********************************************************************
1507 * Function : crunch_reason
1509 * Description : Translates the crunch reason code into a string.
1512 * 1 : rsp = a http_response
1514 * Returns : A string with the crunch reason or an error description.
1516 *********************************************************************/
1517 static const char *crunch_reason(const struct http_response *rsp)
1519 char * reason = NULL;
1521 assert(rsp != NULL);
1524 return "Internal error while searching for crunch reason";
1527 switch (rsp->reason)
1529 case RSP_REASON_UNSUPPORTED:
1530 reason = "Unsupported HTTP feature";
1532 case RSP_REASON_BLOCKED:
1535 case RSP_REASON_UNTRUSTED:
1536 reason = "Untrusted";
1538 case RSP_REASON_REDIRECTED:
1539 reason = "Redirected";
1541 case RSP_REASON_CGI_CALL:
1542 reason = "CGI Call";
1544 case RSP_REASON_NO_SUCH_DOMAIN:
1545 reason = "DNS failure";
1547 case RSP_REASON_FORWARDING_FAILED:
1548 reason = "Forwarding failed";
1550 case RSP_REASON_CONNECT_FAILED:
1551 reason = "Connection failure";
1553 case RSP_REASON_OUT_OF_MEMORY:
1554 reason = "Out of memory (may mask other reasons)";
1557 reason = "No reason recorded";
1565 /*********************************************************************
1567 * Function : send_crunch_response
1569 * Description : Delivers already prepared response for
1570 * intercepted requests, logs the interception
1571 * and frees the response.
1574 * 1 : csp = Current client state (buffers, headers, etc...)
1575 * 1 : rsp = Fully prepared response. Will be freed on exit.
1577 * Returns : Nothing.
1579 *********************************************************************/
1580 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1582 const struct http_request *http = csp->http;
1583 char status_code[4];
1585 assert(rsp != NULL);
1586 assert(rsp->head != NULL);
1591 * Not supposed to happen. If it does
1592 * anyway, treat it as an unknown error.
1594 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1595 /* return code doesn't matter */
1600 /* If rsp is still NULL, we have serious internal problems. */
1601 log_error(LOG_LEVEL_FATAL,
1602 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1606 * Extract the status code from the actual head
1607 * that was send to the client. It is the only
1608 * way to get it right for all requests, including
1609 * the fixed ones for out-of-memory problems.
1611 * A head starts like this: 'HTTP/1.1 200...'
1615 status_code[0] = rsp->head[9];
1616 status_code[1] = rsp->head[10];
1617 status_code[2] = rsp->head[11];
1618 status_code[3] = '\0';
1620 /* Write the answer to the client */
1621 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1622 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1624 /* There is nothing we can do about it. */
1625 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1628 /* Log that the request was crunched and why. */
1629 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1630 http->hostport, http->path, crunch_reason(rsp));
1631 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1632 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1634 /* Clean up and return */
1635 if (cgi_error_memory() != rsp)
1637 free_http_response(rsp);
1644 /*********************************************************************
1646 * Function : request_contains_null_bytes
1648 * Description : Checks for NULL bytes in the request and sends
1649 * an error message to the client if any were found.
1651 * XXX: currently not used, see comment in chat().
1654 * 1 : csp = Current client state (buffers, headers, etc...)
1655 * 2 : buf = Data from the client's request to check.
1656 * 3 : len = The data length.
1658 * Returns : TRUE if the request contained one or more NULL bytes, or
1661 *********************************************************************/
1662 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1664 size_t c_len; /* Request lenght when treated as C string */
1666 c_len = strlen(buf);
1671 * Null byte(s) found. Log the request,
1672 * return an error response and hang up.
1674 size_t tmp_len = c_len;
1679 * Replace NULL byte(s) with '°' characters
1680 * so the request can be logged as string.
1681 * XXX: Is there a better replacement character?
1684 tmp_len += strlen(buf+tmp_len);
1685 } while (tmp_len < len);
1687 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1688 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1689 log_error(LOG_LEVEL_HEADER,
1690 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1692 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1694 /* XXX: Log correct size */
1695 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1705 /*********************************************************************
1707 * Function : crunch_response_triggered
1709 * Description : Checks if the request has to be crunched,
1710 * and delivers the crunch response if necessary.
1713 * 1 : csp = Current client state (buffers, headers, etc...)
1714 * 2 : crunchers = list of cruncher functions to run
1716 * Returns : TRUE if the request was answered with a crunch response
1719 *********************************************************************/
1720 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1722 struct http_response *rsp = NULL;
1723 const struct cruncher *c;
1726 * If CGI request crunching is disabled,
1727 * check the CGI dispatcher out of order to
1728 * prevent unintentional blocks or redirects.
1730 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1731 && (NULL != (rsp = dispatch_cgi(csp))))
1733 /* Deliver, log and free the interception response. */
1734 send_crunch_response(csp, rsp);
1738 for (c = crunchers; c->cruncher != NULL; c++)
1741 * Check the cruncher if either Privoxy is toggled
1742 * on and the request isn't forced, or if the cruncher
1743 * applies to forced requests as well.
1745 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1746 !(csp->flags & CSP_FLAG_FORCED)) ||
1747 (c->flags & CF_IGNORE_FORCE))
1749 rsp = c->cruncher(csp);
1752 /* Deliver, log and free the interception response. */
1753 send_crunch_response(csp, rsp);
1754 #ifdef FEATURE_STATISTICS
1755 if (c->flags & CF_COUNT_AS_REJECT)
1757 csp->flags |= CSP_FLAG_REJECTED;
1759 #endif /* def FEATURE_STATISTICS */
1770 /*********************************************************************
1772 * Function : build_request_line
1774 * Description : Builds the HTTP request line.
1776 * If a HTTP forwarder is used it expects the whole URL,
1777 * web servers only get the path.
1780 * 1 : csp = Current client state (buffers, headers, etc...)
1781 * 2 : fwd = The forwarding spec used for the request
1782 * XXX: Should use http->fwd instead.
1783 * 3 : request_line = The old request line which will be replaced.
1785 * Returns : Nothing. Terminates in case of memory problems.
1787 *********************************************************************/
1788 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1790 struct http_request *http = csp->http;
1792 assert(http->ssl == 0);
1795 * Downgrade http version from 1.1 to 1.0
1796 * if +downgrade action applies.
1798 if ( (csp->action->flags & ACTION_DOWNGRADE)
1799 && (!strcmpic(http->ver, "HTTP/1.1")))
1802 http->ver = strdup("HTTP/1.0");
1804 if (http->ver == NULL)
1806 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1811 * Rebuild the request line.
1813 freez(*request_line);
1814 *request_line = strdup(http->gpc);
1815 string_append(request_line, " ");
1817 if (fwd->forward_host)
1819 string_append(request_line, http->url);
1823 string_append(request_line, http->path);
1825 string_append(request_line, " ");
1826 string_append(request_line, http->ver);
1828 if (*request_line == NULL)
1830 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1832 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1836 /*********************************************************************
1838 * Function : change_request_destination
1840 * Description : Parse a (rewritten) request line and regenerate
1841 * the http request data.
1844 * 1 : csp = Current client state (buffers, headers, etc...)
1846 * Returns : Forwards the parse_http_request() return code.
1847 * Terminates in case of memory problems.
1849 *********************************************************************/
1850 static jb_err change_request_destination(struct client_state *csp)
1852 struct http_request *http = csp->http;
1855 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1856 free_http_request(http);
1857 err = parse_http_request(csp->headers->first->str, http, csp);
1858 if (JB_ERR_OK != err)
1860 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1861 jb_err_to_string(err));
1863 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1864 if (http->ocmd == NULL)
1866 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1873 /*********************************************************************
1877 * Description : Once a connection to the client has been accepted,
1878 * this function is called (via serve()) to handle the
1879 * main business of the communication. When this
1880 * function returns, the caller must close the client
1883 * FIXME: chat is nearly thousand lines long.
1887 * 1 : csp = Current client state (buffers, headers, etc...)
1889 * Returns : Nothing.
1891 *********************************************************************/
1892 static void chat(struct client_state *csp)
1894 char buf[BUFFER_SIZE];
1902 int ms_iis5_hack = 0;
1903 size_t byte_count = 0;
1904 int forwarded_connect_retries = 0;
1905 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1906 const struct forward_spec * fwd;
1907 struct http_request *http;
1908 int len; /* for buffer sizes (and negative error codes) */
1910 #ifdef FEATURE_KILL_POPUPS
1911 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1912 #endif /* def FEATURE_KILL_POPUPS */
1914 /* Function that does the content filtering for the current request */
1915 filter_function_ptr content_filter = NULL;
1917 /* Skeleton for HTTP response, if we should intercept the request */
1918 struct http_response *rsp;
1920 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1921 struct list header_list;
1922 struct list *headers = &header_list;
1926 memset(buf, 0, sizeof(buf));
1929 * Read the client's request. Note that since we're not using select() we
1930 * could get blocked here if a client connected, then didn't say anything!
1935 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1937 if (len <= 0) break; /* error! */
1940 * If there is no memory left for buffering the
1941 * request, there is nothing we can do but hang up
1943 if (add_to_iob(csp, buf, len))
1948 req = get_header(csp);
1950 } while ((NULL != req) && ('\0' == *req));
1952 if ((NULL != req) && ('\0' != *req))
1954 /* Request received. Validate and parse it. */
1958 * XXX: Temporary disabled to prevent problems
1959 * with POST requests whose bodies are allowed to
1960 * contain NULL bytes. BR#1730105.
1962 * The main purpose of this check is to properly
1963 * log stuff like BitTorrent traffic and other junk
1964 * that hits public proxies. It's not required for
1965 * Privoxy to functions as those requests are discarded
1968 * It probably should be rewritten to only check
1969 * the head of the request. Another option would
1970 * be to let all POST requests pass, although that
1971 * may not be good enough.
1973 if (request_contains_null_bytes(csp, buf, len))
1975 /* NULL bytes found and dealt with, just hang up. */
1980 /* Does the request line look invalid? */
1981 if (client_protocol_is_unsupported(csp, req))
1984 * Yes. The request has already been
1985 * answered with a error response, the buffers
1986 * were freed and we're done with chatting.
1991 #ifdef FEATURE_FORCE_LOAD
1993 * If this request contains the FORCE_PREFIX and blocks
1994 * aren't enforced, get rid of it and set the force flag.
1996 if (strstr(req, FORCE_PREFIX))
1998 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2000 log_error(LOG_LEVEL_FORCE,
2001 "Ignored force prefix in request: \"%s\".", req);
2005 strclean(req, FORCE_PREFIX);
2006 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2007 csp->flags |= CSP_FLAG_FORCED;
2011 #endif /* def FEATURE_FORCE_LOAD */
2012 err = parse_http_request(req, http, csp);
2013 if (JB_ERR_OK != err)
2015 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2021 if (http->cmd == NULL)
2023 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2024 /* XXX: Use correct size */
2025 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2026 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2028 free_http_request(http);
2032 /* grab the rest of the client's headers */
2036 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2038 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2041 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2042 destroy_list(headers);
2047 * If there is no memory left for buffering the
2048 * request, there is nothing we can do but hang up
2050 if (add_to_iob(csp, buf, len))
2052 destroy_list(headers);
2058 if (p == NULL) break;
2065 if (http->host == NULL)
2068 * If we still don't know the request destination,
2069 * the request is invalid or the client uses
2070 * Privoxy without its knowledge.
2072 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2075 * Our attempts to get the request destination
2076 * elsewhere failed or Privoxy is configured
2077 * to only accept proxy requests.
2079 * An error response has already been send
2080 * and we're done here.
2087 * Determine the actions for this URL
2089 #ifdef FEATURE_TOGGLE
2090 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2092 /* Most compatible set of actions (i.e. none) */
2093 init_current_action(csp->action);
2096 #endif /* ndef FEATURE_TOGGLE */
2098 url_actions(http, csp);
2102 * Save a copy of the original request for logging
2104 http->ocmd = strdup(http->cmd);
2106 if (http->ocmd == NULL)
2108 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2111 enlist(csp->headers, http->cmd);
2113 /* Append the previously read headers */
2114 list_append_list_unique(csp->headers, headers);
2115 destroy_list(headers);
2117 err = sed(client_patterns, add_client_headers, csp);
2118 if (JB_ERR_OK != err)
2120 assert(err == JB_ERR_PARSE);
2121 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2123 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2125 /* Check request line for rewrites. */
2126 if ((NULL == csp->headers->first->str)
2127 || (strcmp(http->cmd, csp->headers->first->str) &&
2128 (JB_ERR_OK != change_request_destination(csp))))
2131 * A header filter broke the request line - bail out.
2133 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2134 /* XXX: Use correct size */
2135 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2136 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2138 free_http_request(http);
2142 /* decide how to route the HTTP request */
2143 fwd = forward_url(csp, http);
2146 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2147 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2151 * build the http request to send to the server
2152 * we have to do one of the following:
2154 * create = use the original HTTP request to create a new
2155 * HTTP request that has either the path component
2156 * without the http://domainspec (w/path) or the
2157 * full orininal URL (w/url)
2158 * Note that the path and/or the HTTP version may
2159 * have been altered by now.
2161 * connect = Open a socket to the host:port of the server
2162 * and short-circuit server and client socket.
2164 * pass = Pass the request unchanged if forwarding a CONNECT
2165 * request to a parent proxy. Note that we'll be sending
2166 * the CFAIL message ourselves if connecting to the parent
2167 * fails, but we won't send a CSUCCEED message if it works,
2168 * since that would result in a double message (ours and the
2169 * parent's). After sending the request to the parent, we simply
2172 * here's the matrix:
2175 * +--------+--------+
2177 * 0 | create | connect|
2179 * Forwarding +--------+--------+
2181 * 1 | create | pass |
2183 * +--------+--------+
2188 * Check if a CONNECT request is allowable:
2189 * In the absence of a +limit-connect action, allow only port 443.
2190 * If there is an action, allow whatever matches the specificaton.
2194 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
2195 || (csp->action->flags & ACTION_LIMIT_CONNECT
2196 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
2198 const char *acceptable_connect_ports =
2199 csp->action->string[ACTION_STRING_LIMIT_CONNECT] ?
2200 csp->action->string[ACTION_STRING_LIMIT_CONNECT] :
2201 "443 (implied default)";
2202 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2205 * The response may confuse some clients,
2206 * but makes unblocking easier.
2208 * XXX: It seems to work with all major browsers,
2209 * so we should consider returning a body by default someday ...
2211 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2212 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2213 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2214 csp->action->flags |= ACTION_BLOCK;
2219 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2220 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2221 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2222 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2223 assert(NULL != csp->http->ocmd);
2224 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2226 list_remove_all(csp->headers);
2228 * XXX: For consistency we might want to log a crunch message here.
2237 freez(csp->headers->first->str);
2238 build_request_line(csp, fwd, &csp->headers->first->str);
2241 hdr = list_to_text(csp->headers);
2244 /* FIXME Should handle error properly */
2245 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2249 * We have a request. Check if one of the crunchers wants it.
2251 if (crunch_response_triggered(csp, crunchers_all))
2254 * Yes. The client got the crunch response
2255 * and we are done here after cleaning up.
2258 list_remove_all(csp->headers);
2264 * The headers can't be removed earlier because
2265 * they were still needed for the referrer check
2266 * in case of CGI crunches.
2268 * XXX: Would it be worth to move the referrer check
2269 * into client_referrer() and set a flag if it's trusted?
2271 list_remove_all(csp->headers);
2273 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2275 if (fwd->forward_host)
2277 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2278 fwd->forward_host, fwd->forward_port, http->hostport);
2282 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2285 /* here we connect to the server, gateway, or the forwarder */
2287 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2288 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2290 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2291 forwarded_connect_retries, http->hostport);
2294 if (csp->sfd == JB_INVALID_SOCKET)
2296 if (fwd->type != SOCKS_NONE)
2299 rsp = error_response(csp, "forwarding-failed", errno);
2301 else if (errno == EINVAL)
2303 rsp = error_response(csp, "no-such-domain", errno);
2307 rsp = error_response(csp, "connect-failed", errno);
2308 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2313 /* Write the answer to the client */
2316 send_crunch_response(csp, rsp);
2323 if (fwd->forward_host || (http->ssl == 0))
2325 /* write the client's (modified) header to the server
2326 * (along with anything else that may be in the buffer)
2329 if (write_socket(csp->sfd, hdr, strlen(hdr))
2330 || (flush_socket(csp->sfd, csp) < 0))
2332 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2335 rsp = error_response(csp, "connect-failed", errno);
2339 send_crunch_response(csp, rsp);
2349 * We're running an SSL tunnel and we're not forwarding,
2350 * so just send the "connect succeeded" message to the
2351 * client, flush the rest, and get out of the way.
2353 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2361 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2363 /* we're finished with the client's header */
2366 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2368 /* pass data between the client and server
2369 * until one or the other shuts down the connection.
2378 * FD_ZERO here seems to point to an errant macro which crashes.
2379 * So do this by hand for now...
2381 memset(&rfds,0x00,sizeof(fd_set));
2385 FD_SET(csp->cfd, &rfds);
2386 FD_SET(csp->sfd, &rfds);
2388 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2392 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2396 /* this is the body of the browser's request
2397 * just read it and write it.
2400 if (FD_ISSET(csp->cfd, &rfds))
2402 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2406 break; /* "game over, man" */
2409 if (write_socket(csp->sfd, buf, (size_t)len))
2411 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2418 * The server wants to talk. It could be the header or the body.
2419 * If `hdr' is null, then it's the header otherwise it's the body.
2420 * FIXME: Does `hdr' really mean `host'? No.
2424 if (FD_ISSET(csp->sfd, &rfds))
2427 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2431 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2433 if (http->ssl && (fwd->forward_host == NULL))
2436 * Just hang up. We already confirmed the client's CONNECT
2437 * request with status code 200 and unencrypted content is
2438 * no longer welcome.
2440 log_error(LOG_LEVEL_ERROR,
2441 "CONNECT already confirmed. Unable to tell the client about the problem.");
2444 else if (byte_count)
2447 * Just hang up. We already transmitted the original headers
2448 * and parts of the original content and therefore missed the
2449 * chance to send an error message (without risking data corruption).
2451 * XXX: we could retry with a fancy range request here.
2453 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2454 "Unable to tell the client about the problem.");
2458 rsp = error_response(csp, "connect-failed", errno);
2462 send_crunch_response(csp, rsp);
2468 /* Add a trailing zero. This lets filter_popups
2469 * use string operations.
2473 #ifdef FEATURE_KILL_POPUPS
2474 /* Filter the popups on this read. */
2475 if (block_popups_now)
2477 filter_popups(buf, csp);
2479 #endif /* def FEATURE_KILL_POPUPS */
2481 /* Normally, this would indicate that we've read
2482 * as much as the server has sent us and we can
2483 * close the client connection. However, Microsoft
2484 * in its wisdom has released IIS/5 with a bug that
2485 * prevents it from sending the trailing \r\n in
2486 * a 302 redirect header (and possibly other headers).
2487 * To work around this if we've haven't parsed
2488 * a full header we'll append a trailing \r\n
2489 * and see if this now generates a valid one.
2491 * This hack shouldn't have any impacts. If we've
2492 * already transmitted the header or if this is a
2493 * SSL connection, then we won't bother with this
2494 * hack. So we only work on partially received
2495 * headers. If we append a \r\n and this still
2496 * doesn't generate a valid header, then we won't
2497 * transmit anything to the client.
2502 if (server_body || http->ssl)
2505 * If we have been buffering up the document,
2506 * now is the time to apply content modification
2507 * and send the result to the client.
2511 p = execute_content_filter(csp, content_filter);
2513 * If the content filter fails, use the original
2514 * buffer and length.
2515 * (see p != NULL ? p : csp->iob->cur below)
2519 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2522 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2524 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2527 hdr = list_to_text(csp->headers);
2530 /* FIXME Should handle error properly */
2531 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2535 * Shouldn't happen because this was the second sed run
2536 * and tags are only created for the first one.
2538 assert(!crunch_response_triggered(csp, crunchers_all));
2540 if (write_socket(csp->cfd, hdr, strlen(hdr))
2541 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2543 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2553 break; /* "game over, man" */
2557 * This is NOT the body, so
2558 * Let's pretend the server just sent us a blank line.
2560 log_error(LOG_LEVEL_INFO,
2561 "Malformerd HTTP headers detected and MS IIS5 hack enabled. "
2562 "Expect an invalid response or even no response at all.");
2563 snprintf(buf, sizeof(buf), "\r\n");
2564 len = (int)strlen(buf);
2567 * Now, let the normal header parsing algorithm below do its
2568 * job. If it fails, we'll exit instead of continuing.
2575 * If this is an SSL connection or we're in the body
2576 * of the server document, just write it to the client,
2577 * unless we need to buffer the body for later content-filtering
2580 if (server_body || http->ssl)
2585 * If there is no memory left for buffering the content, or the buffer limit
2586 * has been reached, switch to non-filtering mode, i.e. make & write the
2587 * header, flush the iob and buf, and get out of the way.
2589 if (add_to_iob(csp, buf, len))
2594 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2596 hdr = list_to_text(csp->headers);
2600 * Memory is too tight to even generate the header.
2601 * Send our static "Out-of-memory" page.
2603 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2604 rsp = cgi_error_memory();
2605 send_crunch_response(csp, rsp);
2609 hdrlen = strlen(hdr);
2611 if (write_socket(csp->cfd, hdr, hdrlen)
2612 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2613 || (write_socket(csp->cfd, buf, (size_t)len)))
2615 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2622 * Reset the byte_count to the amount of bytes
2623 * we just flushed. len will be added a few lines below,
2624 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2626 byte_count = (size_t)flushed;
2628 content_filter = NULL;
2634 if (write_socket(csp->cfd, buf, (size_t)len))
2636 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2640 byte_count += (size_t)len;
2645 /* we're still looking for the end of the
2646 * server's header ... (does that make header
2647 * parsing an "out of body experience" ?
2651 * buffer up the data we just read. If that fails,
2652 * there's little we can do but send our static
2653 * out-of-memory page.
2655 if (add_to_iob(csp, buf, len))
2657 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2658 rsp = cgi_error_memory();
2659 send_crunch_response(csp, rsp);
2664 /* Convert iob into something sed() can digest */
2665 if (JB_ERR_PARSE == get_server_headers(csp))
2669 /* Well, we tried our MS IIS/5
2670 * hack and it didn't work.
2671 * The header is incomplete
2672 * and there isn't anything
2673 * we can do about it.
2679 /* Since we have to wait for
2680 * more from the server before
2681 * we can parse the headers
2682 * we just continue here.
2688 /* Did we actually get anything? */
2689 if (NULL == csp->headers->first)
2691 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2692 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2693 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2694 free_http_request(http);
2698 /* we have now received the entire header.
2699 * filter it and send the result to the client
2701 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2703 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2705 hdr = list_to_text(csp->headers);
2708 /* FIXME Should handle error properly */
2709 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2712 if (crunch_response_triggered(csp, crunchers_light))
2715 * One of the tags created by a server-header
2716 * tagger triggered a crunch. We already
2717 * delivered the crunch response to the client
2718 * and are done here after cleaning up.
2723 /* Buffer and pcrs filter this if appropriate. */
2725 if (!http->ssl) /* We talk plaintext */
2728 #ifdef FEATURE_KILL_POPUPS
2729 /* Start blocking popups if appropriate. */
2730 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2731 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2733 block_popups_now = 1;
2735 * Filter the part of the body that came in the same read
2736 * as the last headers:
2738 filter_popups(csp->iob->cur, csp);
2740 #endif /* def FEATURE_KILL_POPUPS */
2741 content_filter = get_filter_function(csp);
2744 * Only write if we're not buffering for content modification
2746 if (!content_filter)
2748 /* write the server's (modified) header to
2749 * the client (along with anything else that
2750 * may be in the buffer)
2753 if (write_socket(csp->cfd, hdr, strlen(hdr))
2754 || ((len = flush_socket(csp->cfd, csp)) < 0))
2756 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2758 /* the write failed, so don't bother
2759 * mentioning it to the client...
2760 * it probably can't hear us anyway.
2766 byte_count += (size_t)len;
2769 /* we're finished with the server's header */
2774 /* If this was a MS IIS/5 hack then it means
2775 * the server has already closed the
2776 * connection. Nothing more to read. Time
2787 return; /* huh? we should never get here */
2790 if (csp->content_length == 0)
2793 * If Privoxy didn't recalculate the
2794 * Content-Lenght, byte_count is still
2797 csp->content_length = byte_count;
2800 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2801 csp->ip_addr_str, http->ocmd, csp->content_length);
2805 /*********************************************************************
2809 * Description : This is little more than chat. We only "serve" to
2810 * to close any socket that chat may have opened.
2813 * 1 : csp = Current client state (buffers, headers, etc...)
2817 *********************************************************************/
2819 void serve(struct client_state *csp)
2820 #else /* ifndef AMIGA */
2821 static void serve(struct client_state *csp)
2822 #endif /* def AMIGA */
2825 close_socket(csp->cfd);
2827 if (csp->sfd != JB_INVALID_SOCKET)
2829 close_socket(csp->sfd);
2832 csp->flags &= ~CSP_FLAG_ACTIVE;
2838 /*********************************************************************
2840 * Function : server_thread
2842 * Description : We only exist to call `serve' in a threaded environment.
2845 * 1 : data = Current client state (buffers, headers, etc...)
2847 * Returns : Always 0.
2849 *********************************************************************/
2850 static int32 server_thread(void *data)
2852 serve((struct client_state *) data);
2859 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2860 /*********************************************************************
2864 * Description : Print usage info & exit.
2866 * Parameters : Pointer to argv[0] for identifying ourselves
2870 *********************************************************************/
2871 static void usage(const char *myname)
2873 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2877 #endif /* defined(unix) */
2880 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2881 #endif /* defined(unix) */
2882 "[--version] [configfile]\n"
2883 "Aborting\n", myname);
2888 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2891 /*********************************************************************
2893 * Function : initialize_mutexes
2895 * Description : Prepares mutexes if mutex support is available.
2899 * Returns : Void, exits in case of errors.
2901 *********************************************************************/
2902 static void initialize_mutexes(void)
2906 #ifdef FEATURE_PTHREAD
2908 * Prepare global mutex semaphores
2910 err = pthread_mutex_init(&log_mutex, 0);
2912 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2915 * XXX: The assumptions below are a bit naive
2916 * and can cause locks that aren't necessary.
2918 * For example older FreeBSD versions (< 6.x?)
2919 * have no gethostbyname_r, but gethostbyname is
2922 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2923 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2924 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2926 * XXX: should we use a single mutex for
2927 * localtime() and gmtime() as well?
2929 #ifndef HAVE_GMTIME_R
2930 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2931 #endif /* ndef HAVE_GMTIME_R */
2933 #ifndef HAVE_LOCALTIME_R
2934 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2935 #endif /* ndef HAVE_GMTIME_R */
2938 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2939 #endif /* ndef HAVE_RANDOM */
2940 #endif /* FEATURE_PTHREAD */
2943 * TODO: mutex support for mingw32 would be swell.
2948 printf("Fatal error. Mutex initialization failed: %s.\n",
2957 /*********************************************************************
2961 * Description : Load the config file and start the listen loop.
2962 * This function is a lot more *sane* with the `load_config'
2963 * and `listen_loop' functions; although it stills does
2964 * a *little* too much for my taste.
2967 * 1 : argc = Number of parameters (including $0).
2968 * 2 : argv = Array of (char *)'s to the parameters.
2970 * Returns : 1 if : can't open config file, unrecognized directive,
2971 * stats requested in multi-thread mode, can't open the
2972 * log file, can't open the jar file, listen port is invalid,
2973 * any load fails, and can't bind port.
2975 * Else main never returns, the process must be signaled
2976 * to terminate execution. Or, on Windows, use the
2977 * "File", "Exit" menu option.
2979 *********************************************************************/
2981 int real_main(int argc, const char *argv[])
2983 int main(int argc, const char *argv[])
2987 unsigned int random_seed;
2989 struct passwd *pw = NULL;
2990 struct group *grp = NULL;
2993 char *pre_chroot_nslookup_to_load_resolver = NULL;
3000 #if !defined(_WIN32)
3008 * Parse the command line arguments
3010 * XXX: simply printing usage information in case of
3011 * invalid arguments isn't particular user friendly.
3013 while (++argc_pos < argc)
3016 /* Check to see if the service must be installed or uninstalled */
3017 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3019 const char *pName = argv[argc_pos] + 9;
3022 exit( (install_service(pName)) ? 0 : 1 );
3024 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3026 const char *pName = argv[argc_pos] + 11;
3029 exit((uninstall_service(pName)) ? 0 : 1);
3031 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3033 bRunAsService = TRUE;
3034 w32_set_service_cwd();
3035 atexit(w32_service_exit_notify);
3038 #endif /* defined(_WIN32) */
3041 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3043 if (strcmp(argv[argc_pos], "--help") == 0)
3048 else if(strcmp(argv[argc_pos], "--version") == 0)
3050 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3056 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3061 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3063 if (++argc_pos == argc) usage(argv[0]);
3064 pidfile = strdup(argv[argc_pos]);
3067 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3069 if (++argc_pos == argc) usage(argv[argc_pos]);
3071 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3074 if (NULL == (grp = getgrnam(p)))
3076 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3080 if (NULL == (pw = getpwnam(argv[argc_pos])))
3082 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3085 if (p != NULL) *--p = '\0';
3088 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3090 if (++argc_pos == argc) usage(argv[0]);
3091 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3094 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3098 #endif /* defined(unix) */
3100 else if (argc_pos + 1 != argc)
3103 * This is neither the last command line
3104 * option, nor was it recognized before,
3105 * therefore it must be invalid.
3111 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3113 configfile = argv[argc_pos];
3116 } /* -END- while (more arguments) */
3119 if ( *configfile != '/' )
3121 char cwd[BUFFER_SIZE];
3123 size_t abs_file_size;
3125 /* make config-filename absolute here */
3126 if (NULL == getcwd(cwd, sizeof(cwd)))
3128 perror("failed to get current working directory");
3133 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3134 basedir = strdup(cwd);
3136 if (NULL == basedir ||
3137 NULL == (abs_file = malloc(abs_file_size)))
3139 perror("malloc failed");
3142 strlcpy(abs_file, basedir, abs_file_size);
3143 strlcat(abs_file, "/", abs_file_size );
3144 strlcat(abs_file, configfile, abs_file_size);
3145 configfile = abs_file;
3147 #endif /* defined unix */
3151 clients->next = NULL;
3153 /* XXX: factor out initialising after the next stable release. */
3156 #elif defined(_WIN32)
3160 /* Prepare mutexes if supported and necessary. */
3161 initialize_mutexes();
3163 /* Enable logging until further notice. */
3164 init_log_module(Argv[0]);
3166 random_seed = (unsigned int)time(NULL);
3168 srandom(random_seed);
3169 #elif defined (_WIN32)
3171 * See pick_from_range() in miscutil.c for details.
3173 log_error(LOG_LEVEL_INFO,
3174 "No thread-safe PRNG implemented for your platform. "
3175 "Using weak \'randomization\' factor which will "
3176 "limit the already questionable usefulness of "
3177 "header-time-randomizing actions (disabled by default).");
3180 #endif /* ifdef HAVE_RANDOM */
3183 * Unix signal handling
3185 * Catch the abort, interrupt and terminate signals for a graceful exit
3186 * Catch the hangup signal so the errlog can be reopened.
3187 * Ignore the broken pipe signals (FIXME: Why?)
3189 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3192 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3193 const int ignored_signals[] = { SIGPIPE, 0 };
3195 for (idx = 0; catched_signals[idx] != 0; idx++)
3197 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3198 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3200 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3201 #endif /* ifdef sun */
3203 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3207 for (idx = 0; ignored_signals[idx] != 0; idx++)
3209 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3211 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3216 #else /* ifdef _WIN32 */
3217 # ifdef _WIN_CONSOLE
3219 * We *are* in a windows console app.
3220 * Print a verbose messages about FAQ's and such
3222 printf("%s", win32_blurb);
3223 # endif /* def _WIN_CONSOLE */
3224 #endif /* def _WIN32 */
3227 /* Initialize the CGI subsystem */
3228 cgi_init_error_messages();
3231 * If runnig on unix and without the --nodaemon
3232 * option, become a daemon. I.e. fork, detach
3233 * from tty and get process group leadership
3246 if ( pid < 0 ) /* error */
3251 else if ( pid != 0 ) /* parent */
3256 * must check for errors
3257 * child died due to missing files aso
3260 wpid = waitpid( pid, &status, WNOHANG );
3269 /* Should be more portable, but not as well tested */
3274 #else /* ndef __FreeBSD__ */
3276 #endif /* ndef __FreeBSD__ */
3277 fd = open("/dev/tty", O_RDONLY);
3280 /* no error check here */
3281 ioctl( fd, TIOCNOTTY,0 );
3286 * stderr (fd 2) will be closed later on, when the
3287 * log file has been parsed.
3294 } /* -END- if (!no_daemon) */
3297 * As soon as we have written the PID file, we can switch
3298 * to the user and group ID indicated by the --user option
3304 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3306 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3312 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3314 /* Read the time zone file from /etc before doing chroot. */
3316 if (NULL != pre_chroot_nslookup_to_load_resolver
3317 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3319 /* Initialize resolver library. */
3320 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3322 if (chroot(pw->pw_dir) < 0)
3324 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3328 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3331 if (setuid(pw->pw_uid))
3333 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3337 char putenv_dummy[64];
3339 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3340 if (putenv(putenv_dummy) != 0)
3342 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3345 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3346 if (putenv(putenv_dummy) != 0)
3348 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3354 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3357 #endif /* defined unix */
3360 /* This will be FALSE unless the command line specified --service
3364 /* Yup, so now we must attempt to establish a connection
3365 * with the service dispatcher. This will only work if this
3366 * process was launched by the service control manager to
3367 * actually run as a service. If this isn't the case, i've
3368 * known it take around 30 seconds or so for the call to return.
3371 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3372 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3374 /* Service has run, and at this point is now being stopped, so just return */
3379 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3381 /* An error occurred. Usually it's because --service was wrongly specified
3382 * and we were unable to connect to the Service Control Dispatcher because
3383 * it wasn't expecting us and is therefore not listening.
3385 * For now, just continue below to call the listen_loop function.
3388 #endif /* def _WIN32 */
3398 /*********************************************************************
3400 * Function : bind_port_helper
3402 * Description : Bind the listen port. Handles logging, and aborts
3406 * 1 : config = Privoxy configuration. Specifies port
3409 * Returns : Port that was opened.
3411 *********************************************************************/
3412 static jb_socket bind_port_helper(struct configuration_spec * config)
3417 if (config->haddr == NULL)
3419 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3424 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3425 config->hport, config->haddr);
3428 result = bind_port(config->haddr, config->hport, &bfd);
3435 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3436 "There may be another Privoxy or some other "
3437 "proxy running on port %d",
3438 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3439 config->hport, config->hport);
3442 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3443 "The hostname is not resolvable",
3444 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3447 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3448 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3451 /* shouldn't get here */
3452 return JB_INVALID_SOCKET;
3455 config->need_bind = 0;
3462 /* Without this simple workaround we get this compiler warning from _beginthread
3463 * warning C4028: formal parameter 1 different from declaration
3465 void w32_service_listen_loop(void *p)
3469 #endif /* def _WIN32 */
3472 /*********************************************************************
3474 * Function : listen_loop
3476 * Description : bind the listen port and enter a "FOREVER" listening loop.
3482 *********************************************************************/
3483 static void listen_loop(void)
3485 struct client_state *csp = NULL;
3487 struct configuration_spec * config;
3489 config = load_config();
3491 bfd = bind_port_helper(config);
3493 #ifdef FEATURE_GRACEFUL_TERMINATION
3494 while (!g_terminate)
3499 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3500 while (waitpid(-1, NULL, WNOHANG) > 0)
3502 /* zombie children */
3504 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3507 * Free data that was used by died threads
3513 * Re-open the errlog after HUP signal
3515 if (received_hup_signal)
3517 init_error_log(Argv[0], config->logfile);
3518 received_hup_signal = 0;
3523 #ifdef FEATURE_COOKIE_JAR
3525 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3526 * already open. I think unload_configfile() is not being run, which should do
3527 * this work. Until that can get resolved, we'll use this workaround.
3531 if (csp->config->jar)
3533 fclose(csp->config->jar);
3534 csp->config->jar = NULL;
3536 #endif /* FEATURE_COOKIE_JAR */
3537 #endif /* __OS2__ */
3539 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3541 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3545 csp->flags |= CSP_FLAG_ACTIVE;
3546 csp->sfd = JB_INVALID_SOCKET;
3548 csp->config = config = load_config();
3550 if ( config->need_bind )
3553 * Since we were listening to the "old port", we will not see
3554 * a "listen" param change until the next IJB request. So, at
3555 * least 1 more request must be made for us to find the new
3556 * setting. I am simply closing the old socket and binding the
3559 * Which-ever is correct, we will serve 1 more page via the
3560 * old settings. This should probably be a "show-proxy-args"
3561 * request. This should not be a so common of an operation
3562 * that this will hurt people's feelings.
3567 bfd = bind_port_helper(config);
3570 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3572 if (!accept_connection(csp, bfd))
3574 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3587 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3590 #ifdef FEATURE_TOGGLE
3591 if (global_toggle_state)
3592 #endif /* def FEATURE_TOGGLE */
3594 csp->flags |= CSP_FLAG_TOGGLED_ON;
3597 if (run_loader(csp))
3599 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3600 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3604 if (block_acl(NULL,csp))
3606 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3607 close_socket(csp->cfd);
3611 #endif /* def FEATURE_ACL */
3613 /* add it to the list of clients */
3614 csp->next = clients->next;
3615 clients->next = csp;
3617 if (config->multi_threaded)
3621 /* this is a switch () statment in the C preprocessor - ugh */
3622 #undef SELECTED_ONE_OPTION
3624 /* Use Pthreads in preference to native code */
3625 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3626 #define SELECTED_ONE_OPTION
3628 pthread_t the_thread;
3629 pthread_attr_t attrs;
3631 pthread_attr_init(&attrs);
3632 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3633 errno = pthread_create(&the_thread, &attrs,
3634 (void * (*)(void *))serve, csp);
3635 child_id = errno ? -1 : 0;
3636 pthread_attr_destroy(&attrs);
3640 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3641 #define SELECTED_ONE_OPTION
3642 child_id = _beginthread(
3643 (void (*)(void *))serve,
3648 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3649 #define SELECTED_ONE_OPTION
3650 child_id = _beginthread(
3651 (void(* _Optlink)(void*))serve,
3657 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3658 #define SELECTED_ONE_OPTION
3660 thread_id tid = spawn_thread
3661 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3663 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3665 child_id = (int) tid;
3674 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3675 #define SELECTED_ONE_OPTION
3676 csp->cfd = ReleaseSocket(csp->cfd, -1);
3679 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3680 NP_Output, Output(),
3681 NP_CloseOutput, FALSE,
3682 NP_Name, (ULONG)"privoxy child",
3686 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3687 NP_Output, Output(),
3688 NP_CloseOutput, FALSE,
3689 NP_Name, (ULONG)"privoxy child",
3690 NP_StackSize, 200*1024,
3696 ((struct Task *)child_id)->tc_UserData = csp;
3697 Signal((struct Task *)child_id, SIGF_SINGLE);
3702 #if !defined(SELECTED_ONE_OPTION)
3705 /* This block is only needed when using fork().
3706 * When using threads, the server thread was
3707 * created and run by the call to _beginthread().
3709 if (child_id == 0) /* child */
3712 #ifdef FEATURE_TOGGLE
3713 int inherited_toggle_state = global_toggle_state;
3714 #endif /* def FEATURE_TOGGLE */
3719 * If we've been toggled or we've blocked the request, tell Mom
3722 #ifdef FEATURE_TOGGLE
3723 if (inherited_toggle_state != global_toggle_state)
3725 rc |= RC_FLAG_TOGGLED;
3727 #endif /* def FEATURE_TOGGLE */
3729 #ifdef FEATURE_STATISTICS
3730 if (csp->flags & CSP_FLAG_REJECTED)
3732 rc |= RC_FLAG_BLOCKED;
3734 #endif /* ndef FEATURE_STATISTICS */
3738 else if (child_id > 0) /* parent */
3740 /* in a fork()'d environment, the parent's
3741 * copy of the client socket and the CSP
3745 #if !defined(_WIN32) && !defined(__CYGWIN__)
3747 wait( &child_status );
3750 * Evaluate child's return code: If the child has
3751 * - been toggled, toggle ourselves
3752 * - blocked its request, bump up the stats counter
3755 #ifdef FEATURE_TOGGLE
3756 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3758 global_toggle_state = !global_toggle_state;
3760 #endif /* def FEATURE_TOGGLE */
3762 #ifdef FEATURE_STATISTICS
3764 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3768 #endif /* def FEATURE_STATISTICS */
3770 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3771 close_socket(csp->cfd);
3772 csp->flags &= ~CSP_FLAG_ACTIVE;
3776 #undef SELECTED_ONE_OPTION
3777 /* end of cpp switch () */
3779 if (child_id < 0) /* failed */
3781 char buf[BUFFER_SIZE];
3783 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3785 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3787 write_socket(csp->cfd, buf, strlen(buf));
3788 close_socket(csp->cfd);
3789 csp->flags &= ~CSP_FLAG_ACTIVE;
3800 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3802 /* Clean up. Aim: free all memory (no leaks) */
3803 #ifdef FEATURE_GRACEFUL_TERMINATION
3805 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3807 unload_current_config_file();
3808 unload_current_actions_file();
3809 unload_current_re_filterfile();
3810 #ifdef FEATURE_TRUST
3811 unload_current_trust_file();
3814 if (config->multi_threaded)
3821 } while ((clients->next != NULL) && (--i > 0));
3825 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3836 #ifdef FEATURE_COOKIE_JAR
3837 if (NULL != config->jar)
3839 fclose(config->jar);
3843 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3844 /* Cleanup - remove taskbar icon etc. */
3849 #endif /* FEATURE_GRACEFUL_TERMINATION */