1 const char jcc_rcs[] = "$Id: jcc.c,v 1.168 2008/03/02 12:25:25 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 1.168 2008/03/02 12:25:25 fabiankeil
37 * Also use shiny new connect_port_is_forbidden() in jcc.c.
39 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
40 * Rename url_actions() to get_url_actions() and let it
41 * use the standard parameter ordering.
43 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
44 * Let forward_url() use the standard parameter ordering
45 * and mark its second parameter immutable.
47 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
48 * Remove the "Listening ... for local connections only" log message.
49 * Whether or not remote connections are able to reach Privoxy is up
50 * to the operating system.
52 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
53 * Prevent the log messages for CONNECT requests to unacceptable
54 * ports from printing the limit-connect argument as [null] if
55 * limit-connect hasn't been explicitly enabled.
57 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
58 * Make sure all console-mode apps get a usage() instance
60 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
61 * Reword NO_SERVER_DATA_RESPONSE to make it harder
62 * to misunderstand what the message is all about.
64 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
65 * Unbreak trustfile which previously didn't work without
66 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
68 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
69 * Plug memory leak. Spotted by Valgrind, triggered by
70 * Privoxy-Regression-Test feeding proxyfuzz.py.
72 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
73 * In the HTTP snipplets, refer to the client as client.
75 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
76 * Emit a log message when activating the MS IIS5 hack.
78 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
79 * Log the "weak randomization factor" warning only
80 * once for mingw32 and provide some more details.
82 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
83 * Initialize log module after initializing mutexes, future
84 * deadlocks in that code should now work cross-platform.
86 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
87 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
88 * Reported by Bert van Leeuwen in BR#1818808.
90 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
91 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
93 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
94 * When in daemon mode, close stderr after the configuration file has been
95 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
97 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
98 * - Fix a crash when parsing invalid requests whose first header
99 * is rejected by get_header(). Regression (re?)introduced
100 * in r1.143 by yours truly.
101 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
102 * client_cookie_adder() to make sure send-vanilla-wafer can be
103 * controlled through tags (and thus regression-tested).
105 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
106 * - Move get_filter_function() from jcc.c to filters.c
107 * so the filter functions can be static.
108 * - Don't bother filtering body-less responses.
110 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
111 * Execute content filters through execute_content_filter().
113 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
114 * Initialize req to NULL to make sure it's defined if the
115 * first read_socket() call fails. Reported by icmp30.
117 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
118 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
119 * extensive comments moved to user manual.
121 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
122 * Don't crash if a broken header filter wiped out the request line.
124 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
125 * Fix byte_count calculation in case of flushes
126 * and don't parse the server headers a second time.
128 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
129 * - If there's a connection problem after we already forwarded
130 * parts of the original content, just hang up. Fixes BR#1776724.
131 * - Fix warnings about unused code on mingw32.
132 * - In case of flushes, calculate the byte count
133 * less incorrectly (I think).
135 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
136 * Add some more prototypes for static functions.
138 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
139 * Comment out request_contains_null_bytes() until it's used again.
141 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
142 * #1763173 from Stefan Huehner: s@const static@static const@
143 * and declare some more functions static.
145 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
146 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
147 * and explain why they were rejected in the first place.
148 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
149 * CONNECT requests. The request line was missing.
150 * - Add two more XXX reminders as we don't have enough already.
152 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
153 * As Hal noticed, checking dispatch_cgi() as the last cruncher
154 * looks like a bug if CGI requests are blocked unintentionally,
155 * so don't do it unless the user enabled the new config option
156 * "allow-cgi-request-crunching".
158 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
159 * - Allow to rewrite the request destination behind the client's back.
160 * - Turn the weird-looking unconditional for loop that
161 * reads the client request into a conditional while loop.
162 * Move the stuff that only runs once out of the loop.
163 * - Move parts of chat(), server_content_type() and the
164 * necessary stuff to fix BR#1750917 into get_filter_function().
166 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
167 * Temporary workaround for BR#1730105.
169 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
170 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
171 * deadlocks and crashes on OpenBSD and possibly other OS with neither
172 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
173 * Thanks to Ralf Horstmann for report and solution.
175 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
176 * Add forward-override{} to change the forwarding settings through
177 * action sections. This is mainly interesting to forward different
178 * clients differently (for example based on User-Agent or request
181 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
182 * - Let usage() mention the --chroot parameter.
183 * - Use read_socket() consistently and always leave
184 * the last buffer byte alone, even in cases where
185 * null termination (currently) doesn't matter.
187 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
188 * - Fix config file loading on Unix if no config file is specified.
189 * Since r1.97 Privoxy would always interpret the last argument as
190 * config file, even if it's a valid command line option.
191 * - Abort in case of unrecognized command line options. Closes #1719696.
192 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
193 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
195 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
196 * - Don't rerun crunchers that only depend on the request URL.
197 * - Don't count redirects and CGI requests as "blocked requests".
199 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
200 * Support crunching based on tags created by server-header taggers.
202 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
203 * Make HTTP snippets static (again). Add a Content-Type for those
204 * with content so the browser doesn't guess it based on the URL.
206 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
207 * Move crunching and request line rebuilding out of chat().
209 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
210 * Introduce tags as alternative way to specify which
211 * actions apply to a request. At the moment tags can be
212 * created based on client and server headers.
214 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
215 * Don't CLF-log CONNECT requests twice.
217 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
218 * Log the source address for ACL-related connection drops.
220 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
221 * New config option: enforce-blocks.
223 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
224 * - Move null byte check into separate function.
225 * - Don't confuse the client with error pages
226 * if a CONNECT request was already confirmed.
228 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
229 * Speed up NULL byte escaping and only log the complete
230 * NULL byte requests with header debugging enabled.
232 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
233 * Answer requests that contain NULL bytes with
234 * a custom response instead of waiting for more
235 * data until the client eventually hangs up.
237 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
238 * - Move delivery and logging of crunched responses
239 * from chat() into send_crunch_response().
240 * - Display the reason for generating http_responses.
241 * - Log the content length for LOG_LEVEL_CLF correctly
242 * (still incorrect for some fixed responses).
243 * - Reword an incorrect comment about
244 * treat-forbidden-connects-like-blocks violating
246 * - Add some log messages.
248 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
249 * Move mutex initialization into separate
250 * function and exit in case of errors.
252 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
253 * - Start to reduce chat()'s line count and move
254 * parts of it into separate functions.
255 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
257 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
258 * - Add Proxy-Agent header to HTTP snippets that are
259 * supposed to reach HTTP clients only.
260 * - Made a few CONNECT log messages more descriptive.
261 * - Catch completely empty server responses (as seen
262 * with Tor's fake ".noconnect" top level domain).
263 * - Use shiny new "forwarding-failed" template for socks errors.
265 * Revision 1.118 2007/01/07 07:43:43 joergs
266 * AmigaOS4 support added.
268 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
269 * Added config option accept-intercepted-requests
270 * and disabled it by default.
272 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
273 * Reverted parts of my last commit
274 * to keep error handling working.
276 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
277 * Fixed gcc43 conversion warnings.
279 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
280 * Fix -pedantic ISO C warning about converting
281 * from function pointer to object pointer.
283 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
284 * Silence compiler warning I introduced with my last commit.
286 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
287 * Mutex protect rand() if POSIX threading
288 * is used, warn the user if that's not possible
289 * and stop using it on _WIN32 where it could
292 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
293 * Don't prevent core dumps by catching SIGABRT.
294 * It's rude and makes debugging unreasonable painful.
296 * Revision 1.110 2006/12/13 14:52:53 etresoft
297 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
299 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
300 * Privoxy is now able to run as intercepting
301 * proxy in combination with any packet filter
302 * that does the port redirection. The destination
303 * is extracted from the "Host:" header which
304 * should be available for nearly all requests.
306 * Moved HTTP snipplets into jcc.c.
307 * Added error message for gopher proxy requests.
309 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
310 * Only unlink the pidfile if it's actually used.
312 * Change order of interception checks to make
313 * it possible to block or redirect requests for
316 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
317 * Make pthread mutex locking more generic. Instead of
318 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
319 * and use mutex locking unless there is an _r function
320 * available. Better safe than sorry.
322 * Fixes "./configure --disable-pthread" and should result
323 * in less threading-related problems on pthread-using platforms,
324 * but it still doesn't fix BR#1122404.
326 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
327 * Move pthread.h inclusion from jcc.c to jcc.h.
328 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
330 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
331 * Don't exit after receiving the second SIGHUP on Solaris.
333 * Fixes BR 1052235, but the same problem may exist on other
334 * systems. Once 3.0.6 is out we should use sigset()
335 * where available and see if it breaks anything.
337 * Revision 1.104 2006/09/23 13:26:38 roro
338 * Replace TABs by spaces in source code.
340 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
341 * Fix +redirect{}. Didn't work with -fast-redirects.
343 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
344 * Respond with 400 and a short text message
345 * if the client tries to use Privoxy as FTP proxy.
347 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
348 * Make number of retries in case of forwarded-connect problems
349 * a config file option (forwarded-connect-retries) and use 0 as
352 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
353 * Set random(3) seed.
355 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
356 * Follow the OpenBSD port's lead and protect the resolve
357 * functions on OpenBSD as well.
359 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
360 * --user fix. Only use the user as group if no group is specified.
361 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
363 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
364 * Windows service (re-)integration
368 * --install[:service_name]
369 * --uninstall[:service_name]
372 * They work as follows:
373 * --install will create a service for you and then terminate.
374 * By default the service name will be "privoxy" (without the quotes).
375 * However you can run multiple services if you wish, just by adding
376 * a colon and then a name (no spaces).
378 * --uninstall follows the exact same rules a --install.
380 * --service is used when the program is executed by the service
381 * control manager, and in normal circumstances would never be
382 * used as a command line argument.
384 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
385 * Windows service integration
387 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
388 * Incorporate Fabian Keil's patch work:
389 http://www.fabiankeil.de/sourcecode/privoxy/
391 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
392 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
393 * with what was really the latest development (the v_3_0_branch branch)
395 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
396 * Thanks to Jindrich Makovicka for a race condition fix for the log
397 * file. The race condition remains for non-pthread implementations.
398 * Reference patch #1175720.
400 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
401 * Add the ability to check jpeg images for invalid
402 * lengths of comment blocks. Defensive strategy
403 * against the exploit:
404 * Microsoft Security Bulletin MS04-028
405 * Buffer Overrun in JPEG Processing (GDI+) Could
406 * Allow Code Execution (833987)
407 * Enabled with +inspect-jpegs in actions files.
409 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
410 * - Fixed usage info for non-unix platforms
411 * - Fixed small cmdline parsing bug
413 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
414 * Diagnostics: Now preserve the returncode of pthread_create
415 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
417 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
418 * No longer ignore SIGCHLD. Fixes bug #769381
420 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
421 * Close jarfile on graceful exit, remove stray line
423 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
424 * Cosmetics: Killed a warning, a typo and an allocation left at exit
426 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
427 * No longer rely on non-POSIX.1 extensions of getcwd().
430 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
431 * Replaced setenv() by posix-compliant putenv()
432 * Thanks to Neil McCalden (nmcc AT users.sf.net).
434 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
435 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
437 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
438 * Clean-up and extension of improvements for forked mode:
439 * - Child's return code now consists of flags RC_FLAG_*
440 * - Reporting toggle to parent now properly #ifdef'ed
441 * - Children now report blocking to parent. This enables
442 * statistics in forked mode
444 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
445 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
446 * Children now report having been toggled through _exit(17), parents
447 * watch for that code and toggle themselves if found.
449 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
450 * Wrapping all *_r functions (the non-_r versions of them) with
451 * mutex semaphores for OSX. Hopefully this will take care of all
452 * of those pesky crash reports.
454 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
455 * Fixed two mostly harmless mem leaks
457 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
458 * Fix: Head of global clients list now initialized to NULL
460 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
461 * Added basic support for OPTIONS and TRACE HTTP methods:
462 * - New interceptor direct_response() added in chat().
463 * - sed() moved to earlier in the process, so that the
464 * Host: header is evaluated before actions and forwarding
467 * Revision 1.92 2002/05/08 16:00:46 oes
468 * Chat's buffer handling:
469 * - Fixed bug with unchecked out-of-mem conditions
470 * while reading client request & server headers
471 * - No longer predict if the buffer limit will be exceeded
472 * in the next read -- check add_to_iob's new
473 * return code. If buffer couldn't be extended
474 * (policy or out-of-mem) while
475 * - reading from client: abort
476 * - reading server headers: send error page
477 * - buffering server body for filter: flush,
478 * and if that fails: send error page
480 * Revision 1.91 2002/04/08 20:35:58 swa
483 * Revision 1.90 2002/04/02 14:57:28 oes
484 * Made sending wafers independent of FEATURE_COOKIE_JAR
486 * Revision 1.89 2002/03/31 17:18:59 jongfoster
487 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
489 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
490 * More compiler warning message maintenance
492 * Revision 1.87 2002/03/26 22:29:54 swa
493 * we have a new homepage!
495 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
496 * Workaround for closing the jarfile before load_config() comes around again
498 * Revision 1.85 2002/03/24 15:23:33 jongfoster
501 * Revision 1.84 2002/03/24 13:25:43 swa
502 * name change related issues
504 * Revision 1.83 2002/03/16 23:54:06 jongfoster
505 * Adding graceful termination feature, to help look for memory leaks.
506 * If you enable this (which, by design, has to be done by hand
507 * editing config.h) and then go to http://i.j.b/die, then the program
508 * will exit cleanly after the *next* request. It should free all the
509 * memory that was used.
511 * Revision 1.82 2002/03/13 00:27:05 jongfoster
514 * Revision 1.81 2002/03/12 01:42:50 oes
515 * Introduced modular filters
517 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
518 * OS/2 port maintenance:
519 * - Fixed EMX build - it had decayed a little
520 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
521 * substituted a memset for now.
523 * Revision 1.79 2002/03/09 20:03:52 jongfoster
524 * - Making various functions return int rather than size_t.
525 * (Undoing a recent change). Since size_t is unsigned on
526 * Windows, functions like read_socket that return -1 on
527 * error cannot return a size_t.
529 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
530 * crashes, and also frequently caused JB to jump to 100%
531 * CPU and stay there. (Because it thought it had just
532 * read ((unsigned)-1) == 4Gb of data...)
534 * - The signature of write_socket has changed, it now simply
535 * returns success=0/failure=nonzero.
537 * - Trying to get rid of a few warnings --with-debug on
538 * Windows, I've introduced a new type "jb_socket". This is
539 * used for the socket file descriptors. On Windows, this
540 * is SOCKET (a typedef for unsigned). Everywhere else, it's
541 * an int. The error value can't be -1 any more, so it's
542 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
543 * Windows it maps to the #define INVALID_SOCKET.)
545 * - The signature of bind_port has changed.
547 * Revision 1.78 2002/03/08 21:35:04 oes
548 * Added optional group supplement to --user option. Will now use default group of user if no group given
550 * Revision 1.77 2002/03/07 03:52:06 oes
551 * - Fixed compiler warnings etc
552 * - Improved handling of failed DNS lookups
554 * Revision 1.76 2002/03/06 22:54:35 jongfoster
555 * Automated function-comment nitpicking.
557 * Revision 1.75 2002/03/06 10:02:19 oes
558 * Fixed stupid bug when --user was not given
560 * Revision 1.74 2002/03/06 00:49:31 jongfoster
561 * Fixing warning on Windows
562 * Making #ifdefs that refer to the same variable consistently
563 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
565 * Revision 1.73 2002/03/05 23:57:30 hal9
566 * Stray character 's' on line 1618 was breaking build.
568 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
569 * - Re-enable OS/2 building after new parms were added
570 * - Fix false out of memory report when resolving CGI templates when no IP
571 * address is available of failed attempt (a la no such domain)
573 * Revision 1.71 2002/03/05 18:13:56 oes
574 * Added --user option
576 * Revision 1.70 2002/03/05 04:52:42 oes
577 * Deleted non-errlog debugging code
579 * Revision 1.69 2002/03/04 23:50:00 jongfoster
580 * Splitting off bind_port() call into bind_port_helper(), with
583 * Revision 1.68 2002/03/04 20:17:32 oes
586 * Revision 1.67 2002/03/04 18:18:57 oes
587 * - Removed _DEBUG mode
588 * - Cleand up cmdline parsing
589 * - Introduced --no-daemon, --pidfile options
590 * - Cleaned up signal handling:
591 * - Terminate cleanly on INT, TERM and ABRT
592 * - Schedule logfile for re-opening on HUP
593 * - Ignore CHLD and PIPE
594 * - Leave the rest with their default handlers
595 * - Uniform handler registration
596 * - Added usage() function
597 * - Played styleguide police
599 * Revision 1.66 2002/03/03 15:06:55 oes
600 * Re-enabled automatic config reloading
602 * Revision 1.65 2002/03/03 14:49:11 oes
603 * Fixed CLF logging: Now uses client's original HTTP request
605 * Revision 1.64 2002/03/03 09:18:03 joergs
606 * Made jumbjuster work on AmigaOS again.
608 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
609 * Clean up a little CRLF unpleasantness that suddenly appeared
611 * Revision 1.62 2002/02/20 23:17:23 jongfoster
612 * Detecting some out-of memory conditions and exiting with a log message.
614 * Revision 1.61 2002/01/17 21:01:52 jongfoster
615 * Moving all our URL and URL pattern parsing code to urlmatch.c.
617 * Revision 1.60 2001/12/30 14:07:32 steudten
618 * - Add signal handling (unix)
619 * - Add SIGHUP handler (unix)
620 * - Add creation of pidfile (unix)
621 * - Add action 'top' in rc file (RH)
622 * - Add entry 'SIGNALS' to manpage
623 * - Add exit message to logfile (unix)
625 * Revision 1.59 2001/12/13 14:07:18 oes
626 * Fixed Bug: 503 error page now sent OK
628 * Revision 1.58 2001/11/30 23:37:24 jongfoster
629 * Renaming the Win32 config file to config.txt - this is almost the
630 * same as the corresponding UNIX name "config"
632 * Revision 1.57 2001/11/16 00:47:43 jongfoster
633 * Changing the tty-disconnection code to use setsid().
635 * Revision 1.56 2001/11/13 20:20:54 jongfoster
636 * Tabs->spaces, fixing a bug with missing {} around an if()
638 * Revision 1.55 2001/11/13 20:14:53 jongfoster
639 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
641 * Revision 1.54 2001/11/07 00:03:14 steudten
642 * Give reliable return value if an error
643 * occurs not just 0 with new daemon mode.
645 * Revision 1.53 2001/11/05 21:41:43 steudten
646 * Add changes to be a real daemon just for unix os.
647 * (change cwd to /, detach from controlling tty, set
648 * process group and session leader to the own process.
650 * Add some fatal-error log message for failed malloc().
651 * Add '-d' if compiled with 'configure --with-debug' to
652 * enable debug output.
654 * Revision 1.52 2001/10/26 20:11:20 jongfoster
655 * Fixing type mismatch
657 * Revision 1.51 2001/10/26 17:38:28 oes
660 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
661 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
662 * threads to call select() simultaneously. So, it's time to do a real, live,
663 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
664 * (native). Both versions will work, but using __OS2__ offers multi-threading.
666 * Revision 1.49 2001/10/23 21:41:35 jongfoster
667 * Added call to initialize the (statically-allocated of course)
668 * "out of memory" CGI response.
670 * Revision 1.48 2001/10/10 19:56:46 jongfoster
671 * Moving some code that wasn't cookie-related out of an #ifdef
674 * Revision 1.47 2001/10/10 16:44:36 oes
675 * Added CONNECT destination port limitation check
677 * Revision 1.46 2001/10/08 15:17:41 oes
678 * Re-enabled SSL forwarding
680 * Revision 1.45 2001/10/07 15:42:11 oes
681 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
683 * Moved downgrading of the HTTP version from parse_http_request to
684 * chat(), since we can't decide if it is necessary before we have
685 * determined the actions for the URL. The HTTP command is now
686 * *always* re-built so the repairs need no longer be special-cased.
688 * filter_popups now gets a csp pointer so it can raise the new
689 * CSP_FLAG_MODIFIED flag.
693 * Added configurable size limit for the IOB. If the IOB grows so
694 * large that the next read would exceed the limit, the header
695 * is generated, and the header & unfiltered buffer are flushed
696 * to the client. Chat then continues in non-buffering,
697 * non-filtering body mode.
699 * Revision 1.44 2001/10/02 18:13:57 oes
702 * Revision 1.43 2001/10/02 15:32:13 oes
703 * Moved generation of hdr
705 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
706 * Cleaning up 2 compiler warnings on OS/2.
708 * Revision 1.41 2001/09/16 17:05:14 jongfoster
709 * Removing unused #include showarg.h
711 * Revision 1.40 2001/09/16 15:41:45 jongfoster
712 * Fixing signed/unsigned comparison warning.
714 * Revision 1.39 2001/09/16 13:21:27 jongfoster
715 * Changes to use new list functions.
717 * Revision 1.38 2001/09/16 13:01:46 jongfoster
718 * Removing redundant function call that zeroed zalloc()'d memory.
720 * Revision 1.37 2001/09/10 11:12:24 oes
721 * Deleted unused variable
723 * Revision 1.36 2001/09/10 10:56:15 oes
724 * Silenced compiler warnings
726 * Revision 1.35 2001/07/31 14:44:22 oes
727 * Deleted unused size parameter from filter_popups()
729 * Revision 1.34 2001/07/30 22:08:36 jongfoster
730 * Tidying up #defines:
731 * - All feature #defines are now of the form FEATURE_xxx
732 * - Permanently turned off WIN_GUI_EDIT
733 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
735 * Revision 1.33 2001/07/29 19:32:00 jongfoster
736 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
738 * Revision 1.32 2001/07/29 18:47:05 jongfoster
739 * Adding missing #include "loadcfg.h"
741 * Revision 1.31 2001/07/29 12:17:48 oes
742 * Applied pthread fix by Paul Lieverse
744 * Revision 1.30 2001/07/25 22:57:13 jongfoster
745 * __BEOS__ no longer overrides FEATURE_PTHREAD.
746 * This is because FEATURE_PTHREAD will soon be widely used, so I
747 * want to keep it simple.
749 * Revision 1.29 2001/07/24 12:47:06 oes
750 * Applied BeOS support update by Eugenia
752 * Revision 1.28 2001/07/23 13:26:12 oes
753 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
755 * Revision 1.27 2001/07/19 19:09:47 haroon
756 * - Added code to take care of the situation where while processing the first
757 * server response (which includes the server header), after finding the end
758 * of the headers we were not looking past the end of the headers for
759 * content modification. I enabled it for filter_popups.
760 * Someone else should look to see if other similar operations should be
761 * done to the discarded portion of the buffer.
763 * Note 2001/07/20: No, the other content modification mechanisms will process
764 * the whole iob later anyway. --oes
766 * Revision 1.26 2001/07/18 12:31:36 oes
769 * Revision 1.25 2001/07/15 19:43:49 jongfoster
770 * Supports POSIX threads.
771 * Also removed some unused #includes.
773 * Revision 1.24 2001/07/13 14:00:40 oes
774 * - Generic content modification scheme:
775 * Each feature has its own applicability flag that is set
776 * from csp->action->flags.
777 * Replaced the "filtering" int flag , by a function pointer
778 * "content_filter" to the function that will do the content
779 * modification. If it is != NULL, the document will be buffered
780 * and processed through *content_filter, which must set
781 * csp->content_length and return a modified copy of the body
782 * or return NULL (on failiure).
783 * - Changed csp->is_text to the more generic bitmap csp->content_type
784 * which can currently take the valued CT_TEXT or CT_GIF
786 * - Removed all #ifdef PCRS
788 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
789 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
790 * the `block_acl' call. This prevents a compilation error when the user
791 * does not wish to use the "ACL" feature.
793 * Revision 1.22 2001/06/29 21:45:41 oes
794 * Indentation, CRLF->LF, Tab-> Space
796 * Revision 1.21 2001/06/29 13:29:36 oes
797 * - Cleaned up, improved comments
798 * - Unified all possible interceptors (CGI,
799 * block, trust, fast_redirect) in one
800 * place, with one (CGI) answer generation
801 * mechansim. Much clearer now.
802 * - Removed the GIF image generation, which
803 * is now done in filters.c:block_url()
804 * - Made error conditions like domain lookup
805 * failiure or (various) problems while talking
806 * to the server use cgi.c:error_response()
807 * instead of generating HTML/HTTP in chat() (yuck!)
808 * - Removed logentry from cancelled commit
810 * Revision 1.20 2001/06/09 10:55:28 jongfoster
811 * Changing BUFSIZ ==> BUFFER_SIZE
813 * Revision 1.19 2001/06/07 23:12:52 jongfoster
814 * Replacing function pointer in struct gateway with a directly
815 * called function forwarded_connect().
816 * Replacing struct gateway with struct forward_spec
818 * Revision 1.18 2001/06/03 19:12:16 oes
819 * introduced new cgi handling
821 * Revision 1.17 2001/06/01 20:07:23 jongfoster
822 * Now uses action +image-blocker{} rather than config->tinygif
824 * Revision 1.16 2001/06/01 18:49:17 jongfoster
825 * Replaced "list_share" with "list" - the tiny memory gain was not
826 * worth the extra complexity.
828 * Revision 1.15 2001/05/31 21:24:47 jongfoster
829 * Changed "permission" to "action" throughout.
830 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
831 * Moved vanilla wafer check into chat(), since we must now
832 * decide whether or not to add it based on the URL.
834 * Revision 1.14 2001/05/29 20:14:01 joergs
835 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
838 * Revision 1.13 2001/05/29 09:50:24 jongfoster
839 * Unified blocklist/imagelist/permissionslist.
840 * File format is still under discussion, but the internal changes
843 * Also modified interceptor behaviour:
844 * - We now intercept all URLs beginning with one of the following
845 * prefixes (and *only* these prefixes):
847 * * http://ijbswa.sf.net/config/
848 * * http://ijbswa.sourceforge.net/config/
849 * - New interceptors "home page" - go to http://i.j.b/ to see it.
850 * - Internal changes so that intercepted and fast redirect pages
851 * are not replaced with an image.
852 * - Interceptors now have the option to send a binary page direct
853 * to the client. (i.e. ijb-send-banner uses this)
854 * - Implemented show-url-info interceptor. (Which is why I needed
855 * the above interceptors changes - a typical URL is
856 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
857 * The previous mechanism would not have intercepted that, and
858 * if it had been intercepted then it then it would have replaced
861 * Revision 1.12 2001/05/27 22:17:04 oes
863 * - re_process_buffer no longer writes the modified buffer
864 * to the client, which was very ugly. It now returns the
865 * buffer, which it is then written by chat.
867 * - content_length now adjusts the Content-Length: header
868 * for modified documents rather than crunch()ing it.
869 * (Length info in csp->content_length, which is 0 for
870 * unmodified documents)
872 * - For this to work, sed() is called twice when filtering.
874 * Revision 1.11 2001/05/26 17:27:53 jongfoster
875 * Added support for CLF and fixed LOG_LEVEL_LOG.
876 * Also did CRLF->LF fix of my previous patch.
878 * Revision 1.10 2001/05/26 15:26:15 jongfoster
879 * ACL feature now provides more security by immediately dropping
880 * connections from untrusted hosts.
882 * Revision 1.9 2001/05/26 00:28:36 jongfoster
883 * Automatic reloading of config file.
884 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
885 * Most of the global variables have been moved to a new
886 * struct configuration_spec, accessed through csp->config->globalname
887 * Most of the globals remaining are used by the Win32 GUI.
889 * Revision 1.8 2001/05/25 22:43:18 jongfoster
890 * Fixing minor memory leak and buffer overflow.
892 * Revision 1.7 2001/05/25 22:34:30 jongfoster
895 * Revision 1.6 2001/05/23 00:13:58 joergs
896 * AmigaOS support fixed.
898 * Revision 1.5 2001/05/22 18:46:04 oes
900 * - Enabled filtering banners by size rather than URL
901 * by adding patterns that replace all standard banner
902 * sizes with the "Junkbuster" gif to the re_filterfile
904 * - Enabled filtering WebBugs by providing a pattern
905 * which kills all 1x1 images
907 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
908 * which is selected by the (nonstandard and therefore
909 * capital) letter 'U' in the option string.
910 * It causes the quantifiers to be ungreedy by default.
911 * Appending a ? turns back to greedy (!).
913 * - Added a new interceptor ijb-send-banner, which
914 * sends back the "Junkbuster" gif. Without imagelist or
915 * MSIE detection support, or if tinygif = 1, or the
916 * URL isn't recognized as an imageurl, a lame HTML
917 * explanation is sent instead.
919 * - Added new feature, which permits blocking remote
920 * script redirects and firing back a local redirect
922 * The feature is conditionally compiled, i.e. it
923 * can be disabled with --disable-fast-redirects,
924 * plus it must be activated by a "fast-redirects"
925 * line in the config file, has its own log level
926 * and of course wants to be displayed by show-proxy-args
927 * Note: Boy, all the #ifdefs in 1001 locations and
928 * all the fumbling with configure.in and acconfig.h
929 * were *way* more work than the feature itself :-(
931 * - Because a generic redirect template was needed for
932 * this, tinygif = 3 now uses the same.
934 * - Moved GIFs, and other static HTTP response templates
939 * - Removed some >400 CRs again (Jon, you really worked
942 * Revision 1.4 2001/05/21 19:34:01 jongfoster
943 * Made failure to bind() a fatal error.
945 * Revision 1.3 2001/05/20 01:21:20 jongfoster
946 * Version 2.9.4 checkin.
947 * - Merged popupfile and cookiefile, and added control over PCRS
948 * filtering, in new "permissionsfile".
949 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
950 * file error you now get a message box (in the Win32 GUI) rather
951 * than the program exiting with no explanation.
952 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
954 * - Removed tabs from "config"
955 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
956 * - Bumped up version number.
958 * Revision 1.2 2001/05/17 22:34:44 oes
959 * - Added hint on GIF char array generation to jcc.c
960 * - Cleaned CRLF's from the sources and related files
961 * - Repaired logging for REF and FRC
963 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
964 * Initial import of version 2.9.3 source tree
967 *********************************************************************/
973 #include <sys/types.h>
982 # ifndef FEATURE_PTHREAD
986 # include <windows.h>
987 # include <process.h>
988 # endif /* ndef FEATURE_PTHREAD */
991 # ifndef _WIN_CONSOLE
993 # endif /* ndef _WIN_CONSOLE */
994 # include "w32svrapi.h"
996 #else /* ifndef _WIN32 */
998 # if !defined (__OS2__)
1000 # include <sys/wait.h>
1001 # endif /* ndef __OS2__ */
1002 # include <sys/time.h>
1003 # include <sys/stat.h>
1004 # include <sys/ioctl.h>
1007 #include <sys/termios.h>
1015 # include <signal.h>
1018 # include <socket.h> /* BeOS has select() for sockets only. */
1019 # include <OS.h> /* declarations for threads and stuff. */
1022 # if defined(__EMX__) || defined(__OS2__)
1023 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1028 #define bzero(B,N) memset(B,0x00,n)
1032 # include <select.h>
1037 #include "project.h"
1040 #include "filters.h"
1041 #include "loaders.h"
1042 #include "parsers.h"
1043 #include "killpopup.h"
1044 #include "miscutil.h"
1046 #include "jbsockets.h"
1047 #include "gateway.h"
1048 #include "actions.h"
1050 #include "loadcfg.h"
1051 #include "urlmatch.h"
1053 const char jcc_h_rcs[] = JCC_H_VERSION;
1054 const char project_h_rcs[] = PROJECT_H_VERSION;
1057 struct client_state clients[1];
1058 struct file_list files[1];
1060 #ifdef FEATURE_STATISTICS
1061 int urls_read = 0; /* total nr of urls read inc rejected */
1062 int urls_rejected = 0; /* total nr of urls rejected */
1063 #endif /* def FEATURE_STATISTICS */
1065 #ifdef FEATURE_GRACEFUL_TERMINATION
1066 int g_terminate = 0;
1069 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1070 static void sig_handler(int the_signal);
1072 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1073 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1074 static jb_err get_server_headers(struct client_state *csp);
1075 static const char *crunch_reason(const struct http_response *rsp);
1076 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1078 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1080 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1081 static jb_err change_request_destination(struct client_state *csp);
1082 static void chat(struct client_state *csp);
1083 static void serve(struct client_state *csp);
1084 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1085 static void usage(const char *myname);
1087 static void initialize_mutexes(void);
1088 static jb_socket bind_port_helper(struct configuration_spec *config);
1089 static void listen_loop(void);
1092 void serve(struct client_state *csp);
1093 #else /* ifndef AMIGA */
1094 static void serve(struct client_state *csp);
1095 #endif /* def AMIGA */
1098 static int32 server_thread(void *data);
1099 #endif /* def __BEOS__ */
1102 #define sleep(N) Sleep(((N) * 1000))
1106 #define sleep(N) DosSleep(((N) * 100))
1109 #ifdef FEATURE_PTHREAD
1110 pthread_mutex_t log_mutex;
1111 pthread_mutex_t log_init_mutex;
1113 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1114 pthread_mutex_t resolver_mutex;
1115 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1117 #ifndef HAVE_GMTIME_R
1118 pthread_mutex_t gmtime_mutex;
1119 #endif /* ndef HAVE_GMTIME_R */
1121 #ifndef HAVE_LOCALTIME_R
1122 pthread_mutex_t localtime_mutex;
1123 #endif /* ndef HAVE_GMTIME_R */
1126 pthread_mutex_t rand_mutex;
1127 #endif /* ndef HAVE_RANDOM */
1129 #endif /* FEATURE_PTHREAD */
1131 #if defined(unix) || defined(__EMX__)
1132 const char *basedir = NULL;
1133 const char *pidfile = NULL;
1134 int received_hup_signal = 0;
1135 #endif /* defined unix */
1137 /* HTTP snipplets. */
1138 static const char CSUCCEED[] =
1139 "HTTP/1.0 200 Connection established\r\n"
1140 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1142 static const char CHEADER[] =
1143 "HTTP/1.0 400 Invalid header received from client\r\n"
1144 "Proxy-Agent: Privoxy " VERSION "\r\n"
1145 "Content-Type: text/plain\r\n"
1146 "Connection: close\r\n\r\n"
1147 "Invalid header received from client.\r\n";
1149 static const char FTP_RESPONSE[] =
1150 "HTTP/1.0 400 Invalid request received from client\r\n"
1151 "Content-Type: text/plain\r\n"
1152 "Connection: close\r\n\r\n"
1153 "Invalid request. Privoxy doesn't support FTP.\r\n";
1155 static const char GOPHER_RESPONSE[] =
1156 "HTTP/1.0 400 Invalid request received from client\r\n"
1157 "Content-Type: text/plain\r\n"
1158 "Connection: close\r\n\r\n"
1159 "Invalid request. Privoxy doesn't support gopher.\r\n";
1161 /* XXX: should be a template */
1162 static const char MISSING_DESTINATION_RESPONSE[] =
1163 "HTTP/1.0 400 Bad request received from client\r\n"
1164 "Proxy-Agent: Privoxy " VERSION "\r\n"
1165 "Content-Type: text/plain\r\n"
1166 "Connection: close\r\n\r\n"
1167 "Bad request. Privoxy was unable to extract the destination.\r\n";
1169 /* XXX: should be a template */
1170 static const char NO_SERVER_DATA_RESPONSE[] =
1171 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1172 "Proxy-Agent: Privoxy " VERSION "\r\n"
1173 "Content-Type: text/plain\r\n"
1174 "Connection: close\r\n\r\n"
1175 "Empty server or forwarder response.\r\n"
1176 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1179 /* XXX: should be a template */
1180 static const char NULL_BYTE_RESPONSE[] =
1181 "HTTP/1.0 400 Bad request received from client\r\n"
1182 "Proxy-Agent: Privoxy " VERSION "\r\n"
1183 "Content-Type: text/plain\r\n"
1184 "Connection: close\r\n\r\n"
1185 "Bad request. Null byte(s) before end of request.\r\n";
1188 /* XXX: should be a template */
1189 static const char MESSED_UP_REQUEST_RESPONSE[] =
1190 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1191 "Proxy-Agent: Privoxy " VERSION "\r\n"
1192 "Content-Type: text/plain\r\n"
1193 "Connection: close\r\n\r\n"
1194 "Bad request. Messed up with header filters.\r\n";
1196 /* A function to crunch a response */
1197 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1199 /* Crunch function flags */
1200 #define CF_NO_FLAGS 0
1201 /* Cruncher applies to forced requests as well */
1202 #define CF_IGNORE_FORCE 1
1203 /* Crunched requests are counted for the block statistics */
1204 #define CF_COUNT_AS_REJECT 2
1206 /* A crunch function and its flags */
1209 const crunch_func_ptr cruncher;
1213 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1215 /* Complete list of cruncher functions */
1216 static const struct cruncher crunchers_all[] = {
1217 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1218 { block_url, CF_COUNT_AS_REJECT },
1219 #ifdef FEATURE_TRUST
1220 { trust_url, CF_COUNT_AS_REJECT },
1221 #endif /* def FEATURE_TRUST */
1222 { redirect_url, CF_NO_FLAGS },
1223 { dispatch_cgi, CF_IGNORE_FORCE},
1227 /* Light version, used after tags are applied */
1228 static const struct cruncher crunchers_light[] = {
1229 { block_url, CF_COUNT_AS_REJECT },
1230 { redirect_url, CF_NO_FLAGS },
1235 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1236 /*********************************************************************
1238 * Function : sig_handler
1240 * Description : Signal handler for different signals.
1241 * Exit gracefully on TERM and INT
1242 * or set a flag that will cause the errlog
1243 * to be reopened by the main thread on HUP.
1246 * 1 : the_signal = the signal cause this function to call
1250 *********************************************************************/
1251 static void sig_handler(int the_signal)
1257 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1268 received_hup_signal = 1;
1273 * We shouldn't be here, unless we catch signals
1274 * in main() that we can't handle here!
1276 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1284 /*********************************************************************
1286 * Function : client_protocol_is_unsupported
1288 * Description : Checks if the client used a known unsupported
1289 * protocol and deals with it by sending an error
1293 * 1 : csp = Current client state (buffers, headers, etc...)
1294 * 2 : req = the first request line send by the client
1296 * Returns : TRUE if an error response has been generated, or
1297 * FALSE if the request doesn't look invalid.
1299 *********************************************************************/
1300 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1302 char buf[BUFFER_SIZE];
1305 * If it's a FTP or gopher request, we don't support it.
1307 * These checks are better than nothing, but they might
1308 * not work in all configurations and some clients might
1309 * have problems digesting the answer.
1311 * They should, however, never cause more problems than
1312 * Privoxy's old behaviour (returning the misleading HTML
1315 * "Could not resolve http://(ftp|gopher)://example.org").
1317 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1319 if (!strncmpic(req, "GET ftp://", 10))
1321 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1322 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1323 csp->ip_addr_str, req);
1327 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1328 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1329 csp->ip_addr_str, req);
1331 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1333 write_socket(csp->cfd, buf, strlen(buf));
1342 /*********************************************************************
1344 * Function : get_request_destination_elsewhere
1346 * Description : If the client's request was redirected into
1347 * Privoxy without the client's knowledge,
1348 * the request line lacks the destination host.
1350 * This function tries to get it elsewhere,
1351 * provided accept-intercepted-requests is enabled.
1353 * "Elsewhere" currently only means "Host: header",
1354 * but in the future we may ask the redirecting
1355 * packet filter to look the destination up.
1357 * If the destination stays unknown, an error
1358 * response is send to the client and headers
1359 * are freed so that chat() can return directly.
1362 * 1 : csp = Current client state (buffers, headers, etc...)
1363 * 2 : headers = a header list
1365 * Returns : JB_ERR_OK if the destination is now known, or
1366 * JB_ERR_PARSE if it isn't.
1368 *********************************************************************/
1369 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1373 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1375 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1376 " Privoxy isn't configured to accept intercepted requests.",
1377 csp->ip_addr_str, csp->http->cmd);
1378 /* XXX: Use correct size */
1379 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1380 csp->ip_addr_str, csp->http->cmd);
1382 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1383 destroy_list(headers);
1385 return JB_ERR_PARSE;
1387 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1389 /* Split the domain we just got for pattern matching */
1390 init_domain_components(csp->http);
1396 /* We can't work without destination. Go spread the news.*/
1398 req = list_to_text(headers);
1400 /* XXX: Use correct size */
1401 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1402 csp->ip_addr_str, csp->http->cmd);
1403 log_error(LOG_LEVEL_ERROR,
1404 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1405 csp->ip_addr_str, csp->http->cmd, req);
1408 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1409 destroy_list(headers);
1411 return JB_ERR_PARSE;
1414 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1415 * to get the destination IP address, use it as host directly
1416 * or do a reverse DNS lookup first.
1421 /*********************************************************************
1423 * Function : get_server_headers
1425 * Description : Parses server headers in iob and fills them
1426 * into csp->headers so that they can later be
1430 * 1 : csp = Current client state (buffers, headers, etc...)
1432 * Returns : JB_ERR_OK if everything went fine, or
1433 * JB_ERR_PARSE if the headers were incomplete.
1435 *********************************************************************/
1436 static jb_err get_server_headers(struct client_state *csp)
1438 int continue_hack_in_da_house = 0;
1441 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1446 * continue hack in da house. Ignore the ending of
1447 * this head and continue enlisting header lines.
1448 * The reason is described below.
1450 enlist(csp->headers, "");
1451 continue_hack_in_da_house = 0;
1454 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1457 * It's a bodyless continue response, don't
1458 * stop header parsing after reaching it's end.
1460 * As a result Privoxy will concatenate the
1461 * next response's head and parse and deliver
1462 * the headers as if they belonged to one request.
1464 * The client will separate them because of the
1465 * empty line between them.
1467 * XXX: What we're doing here is clearly against
1468 * the intended purpose of the continue header,
1469 * and under some conditions (HTTP/1.0 client request)
1470 * it's a standard violation.
1472 * Anyway, "sort of against the spec" is preferable
1473 * to "always getting confused by Continue responses"
1474 * (Privoxy's behaviour before this hack was added)
1476 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1477 continue_hack_in_da_house = 1;
1479 else if (*header == '\0')
1482 * If the header is empty, but the Continue hack
1483 * isn't active, we can assume that we reached the
1484 * end of the buffer before we hit the end of the
1487 * Inform the caller an let it decide how to handle it.
1489 return JB_ERR_PARSE;
1493 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1496 * XXX: Should we quit the request and return a
1497 * out of memory error page instead?
1499 log_error(LOG_LEVEL_ERROR,
1500 "Out of memory while enlisting server headers. %s lost.",
1510 /*********************************************************************
1512 * Function : crunch_reason
1514 * Description : Translates the crunch reason code into a string.
1517 * 1 : rsp = a http_response
1519 * Returns : A string with the crunch reason or an error description.
1521 *********************************************************************/
1522 static const char *crunch_reason(const struct http_response *rsp)
1524 char * reason = NULL;
1526 assert(rsp != NULL);
1529 return "Internal error while searching for crunch reason";
1532 switch (rsp->reason)
1534 case RSP_REASON_UNSUPPORTED:
1535 reason = "Unsupported HTTP feature";
1537 case RSP_REASON_BLOCKED:
1540 case RSP_REASON_UNTRUSTED:
1541 reason = "Untrusted";
1543 case RSP_REASON_REDIRECTED:
1544 reason = "Redirected";
1546 case RSP_REASON_CGI_CALL:
1547 reason = "CGI Call";
1549 case RSP_REASON_NO_SUCH_DOMAIN:
1550 reason = "DNS failure";
1552 case RSP_REASON_FORWARDING_FAILED:
1553 reason = "Forwarding failed";
1555 case RSP_REASON_CONNECT_FAILED:
1556 reason = "Connection failure";
1558 case RSP_REASON_OUT_OF_MEMORY:
1559 reason = "Out of memory (may mask other reasons)";
1562 reason = "No reason recorded";
1570 /*********************************************************************
1572 * Function : send_crunch_response
1574 * Description : Delivers already prepared response for
1575 * intercepted requests, logs the interception
1576 * and frees the response.
1579 * 1 : csp = Current client state (buffers, headers, etc...)
1580 * 1 : rsp = Fully prepared response. Will be freed on exit.
1582 * Returns : Nothing.
1584 *********************************************************************/
1585 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1587 const struct http_request *http = csp->http;
1588 char status_code[4];
1590 assert(rsp != NULL);
1591 assert(rsp->head != NULL);
1596 * Not supposed to happen. If it does
1597 * anyway, treat it as an unknown error.
1599 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1600 /* return code doesn't matter */
1605 /* If rsp is still NULL, we have serious internal problems. */
1606 log_error(LOG_LEVEL_FATAL,
1607 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1611 * Extract the status code from the actual head
1612 * that was send to the client. It is the only
1613 * way to get it right for all requests, including
1614 * the fixed ones for out-of-memory problems.
1616 * A head starts like this: 'HTTP/1.1 200...'
1620 status_code[0] = rsp->head[9];
1621 status_code[1] = rsp->head[10];
1622 status_code[2] = rsp->head[11];
1623 status_code[3] = '\0';
1625 /* Write the answer to the client */
1626 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1627 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1629 /* There is nothing we can do about it. */
1630 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1633 /* Log that the request was crunched and why. */
1634 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1635 http->hostport, http->path, crunch_reason(rsp));
1636 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1637 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1639 /* Clean up and return */
1640 if (cgi_error_memory() != rsp)
1642 free_http_response(rsp);
1649 /*********************************************************************
1651 * Function : request_contains_null_bytes
1653 * Description : Checks for NULL bytes in the request and sends
1654 * an error message to the client if any were found.
1656 * XXX: currently not used, see comment in chat().
1659 * 1 : csp = Current client state (buffers, headers, etc...)
1660 * 2 : buf = Data from the client's request to check.
1661 * 3 : len = The data length.
1663 * Returns : TRUE if the request contained one or more NULL bytes, or
1666 *********************************************************************/
1667 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1669 size_t c_len; /* Request lenght when treated as C string */
1671 c_len = strlen(buf);
1676 * Null byte(s) found. Log the request,
1677 * return an error response and hang up.
1679 size_t tmp_len = c_len;
1684 * Replace NULL byte(s) with '°' characters
1685 * so the request can be logged as string.
1686 * XXX: Is there a better replacement character?
1689 tmp_len += strlen(buf+tmp_len);
1690 } while (tmp_len < len);
1692 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1693 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1694 log_error(LOG_LEVEL_HEADER,
1695 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1697 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1699 /* XXX: Log correct size */
1700 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1710 /*********************************************************************
1712 * Function : crunch_response_triggered
1714 * Description : Checks if the request has to be crunched,
1715 * and delivers the crunch response if necessary.
1718 * 1 : csp = Current client state (buffers, headers, etc...)
1719 * 2 : crunchers = list of cruncher functions to run
1721 * Returns : TRUE if the request was answered with a crunch response
1724 *********************************************************************/
1725 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1727 struct http_response *rsp = NULL;
1728 const struct cruncher *c;
1731 * If CGI request crunching is disabled,
1732 * check the CGI dispatcher out of order to
1733 * prevent unintentional blocks or redirects.
1735 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1736 && (NULL != (rsp = dispatch_cgi(csp))))
1738 /* Deliver, log and free the interception response. */
1739 send_crunch_response(csp, rsp);
1743 for (c = crunchers; c->cruncher != NULL; c++)
1746 * Check the cruncher if either Privoxy is toggled
1747 * on and the request isn't forced, or if the cruncher
1748 * applies to forced requests as well.
1750 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1751 !(csp->flags & CSP_FLAG_FORCED)) ||
1752 (c->flags & CF_IGNORE_FORCE))
1754 rsp = c->cruncher(csp);
1757 /* Deliver, log and free the interception response. */
1758 send_crunch_response(csp, rsp);
1759 #ifdef FEATURE_STATISTICS
1760 if (c->flags & CF_COUNT_AS_REJECT)
1762 csp->flags |= CSP_FLAG_REJECTED;
1764 #endif /* def FEATURE_STATISTICS */
1775 /*********************************************************************
1777 * Function : build_request_line
1779 * Description : Builds the HTTP request line.
1781 * If a HTTP forwarder is used it expects the whole URL,
1782 * web servers only get the path.
1785 * 1 : csp = Current client state (buffers, headers, etc...)
1786 * 2 : fwd = The forwarding spec used for the request
1787 * XXX: Should use http->fwd instead.
1788 * 3 : request_line = The old request line which will be replaced.
1790 * Returns : Nothing. Terminates in case of memory problems.
1792 *********************************************************************/
1793 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1795 struct http_request *http = csp->http;
1797 assert(http->ssl == 0);
1800 * Downgrade http version from 1.1 to 1.0
1801 * if +downgrade action applies.
1803 if ( (csp->action->flags & ACTION_DOWNGRADE)
1804 && (!strcmpic(http->ver, "HTTP/1.1")))
1807 http->ver = strdup("HTTP/1.0");
1809 if (http->ver == NULL)
1811 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1816 * Rebuild the request line.
1818 freez(*request_line);
1819 *request_line = strdup(http->gpc);
1820 string_append(request_line, " ");
1822 if (fwd->forward_host)
1824 string_append(request_line, http->url);
1828 string_append(request_line, http->path);
1830 string_append(request_line, " ");
1831 string_append(request_line, http->ver);
1833 if (*request_line == NULL)
1835 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1837 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1841 /*********************************************************************
1843 * Function : change_request_destination
1845 * Description : Parse a (rewritten) request line and regenerate
1846 * the http request data.
1849 * 1 : csp = Current client state (buffers, headers, etc...)
1851 * Returns : Forwards the parse_http_request() return code.
1852 * Terminates in case of memory problems.
1854 *********************************************************************/
1855 static jb_err change_request_destination(struct client_state *csp)
1857 struct http_request *http = csp->http;
1860 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1861 free_http_request(http);
1862 err = parse_http_request(csp->headers->first->str, http, csp);
1863 if (JB_ERR_OK != err)
1865 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1866 jb_err_to_string(err));
1868 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1869 if (http->ocmd == NULL)
1871 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1878 /*********************************************************************
1882 * Description : Once a connection to the client has been accepted,
1883 * this function is called (via serve()) to handle the
1884 * main business of the communication. When this
1885 * function returns, the caller must close the client
1888 * FIXME: chat is nearly thousand lines long.
1892 * 1 : csp = Current client state (buffers, headers, etc...)
1894 * Returns : Nothing.
1896 *********************************************************************/
1897 static void chat(struct client_state *csp)
1899 char buf[BUFFER_SIZE];
1907 int ms_iis5_hack = 0;
1908 size_t byte_count = 0;
1909 int forwarded_connect_retries = 0;
1910 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1911 const struct forward_spec * fwd;
1912 struct http_request *http;
1913 int len; /* for buffer sizes (and negative error codes) */
1915 #ifdef FEATURE_KILL_POPUPS
1916 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1917 #endif /* def FEATURE_KILL_POPUPS */
1919 /* Function that does the content filtering for the current request */
1920 filter_function_ptr content_filter = NULL;
1922 /* Skeleton for HTTP response, if we should intercept the request */
1923 struct http_response *rsp;
1925 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1926 struct list header_list;
1927 struct list *headers = &header_list;
1931 memset(buf, 0, sizeof(buf));
1934 * Read the client's request. Note that since we're not using select() we
1935 * could get blocked here if a client connected, then didn't say anything!
1940 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1942 if (len <= 0) break; /* error! */
1945 * If there is no memory left for buffering the
1946 * request, there is nothing we can do but hang up
1948 if (add_to_iob(csp, buf, len))
1953 req = get_header(csp);
1955 } while ((NULL != req) && ('\0' == *req));
1957 if ((NULL != req) && ('\0' != *req))
1959 /* Request received. Validate and parse it. */
1963 * XXX: Temporary disabled to prevent problems
1964 * with POST requests whose bodies are allowed to
1965 * contain NULL bytes. BR#1730105.
1967 * The main purpose of this check is to properly
1968 * log stuff like BitTorrent traffic and other junk
1969 * that hits public proxies. It's not required for
1970 * Privoxy to functions as those requests are discarded
1973 * It probably should be rewritten to only check
1974 * the head of the request. Another option would
1975 * be to let all POST requests pass, although that
1976 * may not be good enough.
1978 if (request_contains_null_bytes(csp, buf, len))
1980 /* NULL bytes found and dealt with, just hang up. */
1985 /* Does the request line look invalid? */
1986 if (client_protocol_is_unsupported(csp, req))
1989 * Yes. The request has already been
1990 * answered with a error response, the buffers
1991 * were freed and we're done with chatting.
1996 #ifdef FEATURE_FORCE_LOAD
1998 * If this request contains the FORCE_PREFIX and blocks
1999 * aren't enforced, get rid of it and set the force flag.
2001 if (strstr(req, FORCE_PREFIX))
2003 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2005 log_error(LOG_LEVEL_FORCE,
2006 "Ignored force prefix in request: \"%s\".", req);
2010 strclean(req, FORCE_PREFIX);
2011 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2012 csp->flags |= CSP_FLAG_FORCED;
2016 #endif /* def FEATURE_FORCE_LOAD */
2017 err = parse_http_request(req, http, csp);
2018 if (JB_ERR_OK != err)
2020 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2026 if (http->cmd == NULL)
2028 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2029 /* XXX: Use correct size */
2030 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2031 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2033 free_http_request(http);
2037 /* grab the rest of the client's headers */
2041 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2043 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2046 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2047 destroy_list(headers);
2052 * If there is no memory left for buffering the
2053 * request, there is nothing we can do but hang up
2055 if (add_to_iob(csp, buf, len))
2057 destroy_list(headers);
2063 if (p == NULL) break;
2070 if (http->host == NULL)
2073 * If we still don't know the request destination,
2074 * the request is invalid or the client uses
2075 * Privoxy without its knowledge.
2077 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2080 * Our attempts to get the request destination
2081 * elsewhere failed or Privoxy is configured
2082 * to only accept proxy requests.
2084 * An error response has already been send
2085 * and we're done here.
2092 * Determine the actions for this URL
2094 #ifdef FEATURE_TOGGLE
2095 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2097 /* Most compatible set of actions (i.e. none) */
2098 init_current_action(csp->action);
2101 #endif /* ndef FEATURE_TOGGLE */
2103 get_url_actions(csp, http);
2107 * Save a copy of the original request for logging
2109 http->ocmd = strdup(http->cmd);
2111 if (http->ocmd == NULL)
2113 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2116 enlist(csp->headers, http->cmd);
2118 /* Append the previously read headers */
2119 list_append_list_unique(csp->headers, headers);
2120 destroy_list(headers);
2122 err = sed(client_patterns, add_client_headers, csp);
2123 if (JB_ERR_OK != err)
2125 assert(err == JB_ERR_PARSE);
2126 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2128 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2130 /* Check request line for rewrites. */
2131 if ((NULL == csp->headers->first->str)
2132 || (strcmp(http->cmd, csp->headers->first->str) &&
2133 (JB_ERR_OK != change_request_destination(csp))))
2136 * A header filter broke the request line - bail out.
2138 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2139 /* XXX: Use correct size */
2140 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2141 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2143 free_http_request(http);
2147 /* decide how to route the HTTP request */
2148 fwd = forward_url(csp, http);
2151 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2152 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2156 * build the http request to send to the server
2157 * we have to do one of the following:
2159 * create = use the original HTTP request to create a new
2160 * HTTP request that has either the path component
2161 * without the http://domainspec (w/path) or the
2162 * full orininal URL (w/url)
2163 * Note that the path and/or the HTTP version may
2164 * have been altered by now.
2166 * connect = Open a socket to the host:port of the server
2167 * and short-circuit server and client socket.
2169 * pass = Pass the request unchanged if forwarding a CONNECT
2170 * request to a parent proxy. Note that we'll be sending
2171 * the CFAIL message ourselves if connecting to the parent
2172 * fails, but we won't send a CSUCCEED message if it works,
2173 * since that would result in a double message (ours and the
2174 * parent's). After sending the request to the parent, we simply
2177 * here's the matrix:
2180 * +--------+--------+
2182 * 0 | create | connect|
2184 * Forwarding +--------+--------+
2186 * 1 | create | pass |
2188 * +--------+--------+
2192 if (http->ssl && connect_port_is_forbidden(csp))
2194 const char *acceptable_connect_ports =
2195 csp->action->string[ACTION_STRING_LIMIT_CONNECT] ?
2196 csp->action->string[ACTION_STRING_LIMIT_CONNECT] :
2197 "443 (implied default)";
2198 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2199 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2200 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2201 csp->action->flags |= ACTION_BLOCK;
2207 freez(csp->headers->first->str);
2208 build_request_line(csp, fwd, &csp->headers->first->str);
2211 hdr = list_to_text(csp->headers);
2214 /* FIXME Should handle error properly */
2215 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2219 * We have a request. Check if one of the crunchers wants it.
2221 if (crunch_response_triggered(csp, crunchers_all))
2224 * Yes. The client got the crunch response
2225 * and we are done here after cleaning up.
2228 list_remove_all(csp->headers);
2234 * The headers can't be removed earlier because
2235 * they were still needed for the referrer check
2236 * in case of CGI crunches.
2238 * XXX: Would it be worth to move the referrer check
2239 * into client_referrer() and set a flag if it's trusted?
2241 list_remove_all(csp->headers);
2243 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2245 if (fwd->forward_host)
2247 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2248 fwd->forward_host, fwd->forward_port, http->hostport);
2252 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2255 /* here we connect to the server, gateway, or the forwarder */
2257 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2258 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2260 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2261 forwarded_connect_retries, http->hostport);
2264 if (csp->sfd == JB_INVALID_SOCKET)
2266 if (fwd->type != SOCKS_NONE)
2269 rsp = error_response(csp, "forwarding-failed", errno);
2271 else if (errno == EINVAL)
2273 rsp = error_response(csp, "no-such-domain", errno);
2277 rsp = error_response(csp, "connect-failed", errno);
2278 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2283 /* Write the answer to the client */
2286 send_crunch_response(csp, rsp);
2293 if (fwd->forward_host || (http->ssl == 0))
2295 /* write the client's (modified) header to the server
2296 * (along with anything else that may be in the buffer)
2299 if (write_socket(csp->sfd, hdr, strlen(hdr))
2300 || (flush_socket(csp->sfd, csp) < 0))
2302 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2305 rsp = error_response(csp, "connect-failed", errno);
2309 send_crunch_response(csp, rsp);
2319 * We're running an SSL tunnel and we're not forwarding,
2320 * so just send the "connect succeeded" message to the
2321 * client, flush the rest, and get out of the way.
2323 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2331 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2333 /* we're finished with the client's header */
2336 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2338 /* pass data between the client and server
2339 * until one or the other shuts down the connection.
2348 * FD_ZERO here seems to point to an errant macro which crashes.
2349 * So do this by hand for now...
2351 memset(&rfds,0x00,sizeof(fd_set));
2355 FD_SET(csp->cfd, &rfds);
2356 FD_SET(csp->sfd, &rfds);
2358 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2362 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2366 /* this is the body of the browser's request
2367 * just read it and write it.
2370 if (FD_ISSET(csp->cfd, &rfds))
2372 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2376 break; /* "game over, man" */
2379 if (write_socket(csp->sfd, buf, (size_t)len))
2381 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2388 * The server wants to talk. It could be the header or the body.
2389 * If `hdr' is null, then it's the header otherwise it's the body.
2390 * FIXME: Does `hdr' really mean `host'? No.
2394 if (FD_ISSET(csp->sfd, &rfds))
2397 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2401 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2403 if (http->ssl && (fwd->forward_host == NULL))
2406 * Just hang up. We already confirmed the client's CONNECT
2407 * request with status code 200 and unencrypted content is
2408 * no longer welcome.
2410 log_error(LOG_LEVEL_ERROR,
2411 "CONNECT already confirmed. Unable to tell the client about the problem.");
2414 else if (byte_count)
2417 * Just hang up. We already transmitted the original headers
2418 * and parts of the original content and therefore missed the
2419 * chance to send an error message (without risking data corruption).
2421 * XXX: we could retry with a fancy range request here.
2423 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2424 "Unable to tell the client about the problem.");
2428 rsp = error_response(csp, "connect-failed", errno);
2432 send_crunch_response(csp, rsp);
2438 /* Add a trailing zero. This lets filter_popups
2439 * use string operations.
2443 #ifdef FEATURE_KILL_POPUPS
2444 /* Filter the popups on this read. */
2445 if (block_popups_now)
2447 filter_popups(buf, csp);
2449 #endif /* def FEATURE_KILL_POPUPS */
2451 /* Normally, this would indicate that we've read
2452 * as much as the server has sent us and we can
2453 * close the client connection. However, Microsoft
2454 * in its wisdom has released IIS/5 with a bug that
2455 * prevents it from sending the trailing \r\n in
2456 * a 302 redirect header (and possibly other headers).
2457 * To work around this if we've haven't parsed
2458 * a full header we'll append a trailing \r\n
2459 * and see if this now generates a valid one.
2461 * This hack shouldn't have any impacts. If we've
2462 * already transmitted the header or if this is a
2463 * SSL connection, then we won't bother with this
2464 * hack. So we only work on partially received
2465 * headers. If we append a \r\n and this still
2466 * doesn't generate a valid header, then we won't
2467 * transmit anything to the client.
2472 if (server_body || http->ssl)
2475 * If we have been buffering up the document,
2476 * now is the time to apply content modification
2477 * and send the result to the client.
2481 p = execute_content_filter(csp, content_filter);
2483 * If the content filter fails, use the original
2484 * buffer and length.
2485 * (see p != NULL ? p : csp->iob->cur below)
2489 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2492 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2494 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2497 hdr = list_to_text(csp->headers);
2500 /* FIXME Should handle error properly */
2501 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2505 * Shouldn't happen because this was the second sed run
2506 * and tags are only created for the first one.
2508 assert(!crunch_response_triggered(csp, crunchers_all));
2510 if (write_socket(csp->cfd, hdr, strlen(hdr))
2511 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2513 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2523 break; /* "game over, man" */
2527 * This is NOT the body, so
2528 * Let's pretend the server just sent us a blank line.
2530 log_error(LOG_LEVEL_INFO,
2531 "Malformerd HTTP headers detected and MS IIS5 hack enabled. "
2532 "Expect an invalid response or even no response at all.");
2533 snprintf(buf, sizeof(buf), "\r\n");
2534 len = (int)strlen(buf);
2537 * Now, let the normal header parsing algorithm below do its
2538 * job. If it fails, we'll exit instead of continuing.
2545 * If this is an SSL connection or we're in the body
2546 * of the server document, just write it to the client,
2547 * unless we need to buffer the body for later content-filtering
2550 if (server_body || http->ssl)
2555 * If there is no memory left for buffering the content, or the buffer limit
2556 * has been reached, switch to non-filtering mode, i.e. make & write the
2557 * header, flush the iob and buf, and get out of the way.
2559 if (add_to_iob(csp, buf, len))
2564 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2566 hdr = list_to_text(csp->headers);
2570 * Memory is too tight to even generate the header.
2571 * Send our static "Out-of-memory" page.
2573 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2574 rsp = cgi_error_memory();
2575 send_crunch_response(csp, rsp);
2579 hdrlen = strlen(hdr);
2581 if (write_socket(csp->cfd, hdr, hdrlen)
2582 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2583 || (write_socket(csp->cfd, buf, (size_t)len)))
2585 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2592 * Reset the byte_count to the amount of bytes
2593 * we just flushed. len will be added a few lines below,
2594 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2596 byte_count = (size_t)flushed;
2598 content_filter = NULL;
2604 if (write_socket(csp->cfd, buf, (size_t)len))
2606 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2610 byte_count += (size_t)len;
2615 /* we're still looking for the end of the
2616 * server's header ... (does that make header
2617 * parsing an "out of body experience" ?
2621 * buffer up the data we just read. If that fails,
2622 * there's little we can do but send our static
2623 * out-of-memory page.
2625 if (add_to_iob(csp, buf, len))
2627 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2628 rsp = cgi_error_memory();
2629 send_crunch_response(csp, rsp);
2634 /* Convert iob into something sed() can digest */
2635 if (JB_ERR_PARSE == get_server_headers(csp))
2639 /* Well, we tried our MS IIS/5
2640 * hack and it didn't work.
2641 * The header is incomplete
2642 * and there isn't anything
2643 * we can do about it.
2649 /* Since we have to wait for
2650 * more from the server before
2651 * we can parse the headers
2652 * we just continue here.
2658 /* Did we actually get anything? */
2659 if (NULL == csp->headers->first)
2661 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2662 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2663 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2664 free_http_request(http);
2668 /* we have now received the entire header.
2669 * filter it and send the result to the client
2671 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2673 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2675 hdr = list_to_text(csp->headers);
2678 /* FIXME Should handle error properly */
2679 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2682 if (crunch_response_triggered(csp, crunchers_light))
2685 * One of the tags created by a server-header
2686 * tagger triggered a crunch. We already
2687 * delivered the crunch response to the client
2688 * and are done here after cleaning up.
2693 /* Buffer and pcrs filter this if appropriate. */
2695 if (!http->ssl) /* We talk plaintext */
2698 #ifdef FEATURE_KILL_POPUPS
2699 /* Start blocking popups if appropriate. */
2700 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2701 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2703 block_popups_now = 1;
2705 * Filter the part of the body that came in the same read
2706 * as the last headers:
2708 filter_popups(csp->iob->cur, csp);
2710 #endif /* def FEATURE_KILL_POPUPS */
2711 content_filter = get_filter_function(csp);
2714 * Only write if we're not buffering for content modification
2716 if (!content_filter)
2718 /* write the server's (modified) header to
2719 * the client (along with anything else that
2720 * may be in the buffer)
2723 if (write_socket(csp->cfd, hdr, strlen(hdr))
2724 || ((len = flush_socket(csp->cfd, csp)) < 0))
2726 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2728 /* the write failed, so don't bother
2729 * mentioning it to the client...
2730 * it probably can't hear us anyway.
2736 byte_count += (size_t)len;
2739 /* we're finished with the server's header */
2744 /* If this was a MS IIS/5 hack then it means
2745 * the server has already closed the
2746 * connection. Nothing more to read. Time
2757 return; /* huh? we should never get here */
2760 if (csp->content_length == 0)
2763 * If Privoxy didn't recalculate the
2764 * Content-Lenght, byte_count is still
2767 csp->content_length = byte_count;
2770 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2771 csp->ip_addr_str, http->ocmd, csp->content_length);
2775 /*********************************************************************
2779 * Description : This is little more than chat. We only "serve" to
2780 * to close any socket that chat may have opened.
2783 * 1 : csp = Current client state (buffers, headers, etc...)
2787 *********************************************************************/
2789 void serve(struct client_state *csp)
2790 #else /* ifndef AMIGA */
2791 static void serve(struct client_state *csp)
2792 #endif /* def AMIGA */
2795 close_socket(csp->cfd);
2797 if (csp->sfd != JB_INVALID_SOCKET)
2799 close_socket(csp->sfd);
2802 csp->flags &= ~CSP_FLAG_ACTIVE;
2808 /*********************************************************************
2810 * Function : server_thread
2812 * Description : We only exist to call `serve' in a threaded environment.
2815 * 1 : data = Current client state (buffers, headers, etc...)
2817 * Returns : Always 0.
2819 *********************************************************************/
2820 static int32 server_thread(void *data)
2822 serve((struct client_state *) data);
2829 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2830 /*********************************************************************
2834 * Description : Print usage info & exit.
2836 * Parameters : Pointer to argv[0] for identifying ourselves
2840 *********************************************************************/
2841 static void usage(const char *myname)
2843 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2847 #endif /* defined(unix) */
2850 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2851 #endif /* defined(unix) */
2852 "[--version] [configfile]\n"
2853 "Aborting\n", myname);
2858 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2861 /*********************************************************************
2863 * Function : initialize_mutexes
2865 * Description : Prepares mutexes if mutex support is available.
2869 * Returns : Void, exits in case of errors.
2871 *********************************************************************/
2872 static void initialize_mutexes(void)
2876 #ifdef FEATURE_PTHREAD
2878 * Prepare global mutex semaphores
2880 err = pthread_mutex_init(&log_mutex, 0);
2882 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2885 * XXX: The assumptions below are a bit naive
2886 * and can cause locks that aren't necessary.
2888 * For example older FreeBSD versions (< 6.x?)
2889 * have no gethostbyname_r, but gethostbyname is
2892 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2893 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2894 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2896 * XXX: should we use a single mutex for
2897 * localtime() and gmtime() as well?
2899 #ifndef HAVE_GMTIME_R
2900 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2901 #endif /* ndef HAVE_GMTIME_R */
2903 #ifndef HAVE_LOCALTIME_R
2904 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2905 #endif /* ndef HAVE_GMTIME_R */
2908 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2909 #endif /* ndef HAVE_RANDOM */
2910 #endif /* FEATURE_PTHREAD */
2913 * TODO: mutex support for mingw32 would be swell.
2918 printf("Fatal error. Mutex initialization failed: %s.\n",
2927 /*********************************************************************
2931 * Description : Load the config file and start the listen loop.
2932 * This function is a lot more *sane* with the `load_config'
2933 * and `listen_loop' functions; although it stills does
2934 * a *little* too much for my taste.
2937 * 1 : argc = Number of parameters (including $0).
2938 * 2 : argv = Array of (char *)'s to the parameters.
2940 * Returns : 1 if : can't open config file, unrecognized directive,
2941 * stats requested in multi-thread mode, can't open the
2942 * log file, can't open the jar file, listen port is invalid,
2943 * any load fails, and can't bind port.
2945 * Else main never returns, the process must be signaled
2946 * to terminate execution. Or, on Windows, use the
2947 * "File", "Exit" menu option.
2949 *********************************************************************/
2951 int real_main(int argc, const char *argv[])
2953 int main(int argc, const char *argv[])
2957 unsigned int random_seed;
2959 struct passwd *pw = NULL;
2960 struct group *grp = NULL;
2963 char *pre_chroot_nslookup_to_load_resolver = NULL;
2970 #if !defined(_WIN32)
2978 * Parse the command line arguments
2980 * XXX: simply printing usage information in case of
2981 * invalid arguments isn't particular user friendly.
2983 while (++argc_pos < argc)
2986 /* Check to see if the service must be installed or uninstalled */
2987 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2989 const char *pName = argv[argc_pos] + 9;
2992 exit( (install_service(pName)) ? 0 : 1 );
2994 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
2996 const char *pName = argv[argc_pos] + 11;
2999 exit((uninstall_service(pName)) ? 0 : 1);
3001 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3003 bRunAsService = TRUE;
3004 w32_set_service_cwd();
3005 atexit(w32_service_exit_notify);
3008 #endif /* defined(_WIN32) */
3011 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3013 if (strcmp(argv[argc_pos], "--help") == 0)
3018 else if(strcmp(argv[argc_pos], "--version") == 0)
3020 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3026 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3031 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3033 if (++argc_pos == argc) usage(argv[0]);
3034 pidfile = strdup(argv[argc_pos]);
3037 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3039 if (++argc_pos == argc) usage(argv[argc_pos]);
3041 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3044 if (NULL == (grp = getgrnam(p)))
3046 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3050 if (NULL == (pw = getpwnam(argv[argc_pos])))
3052 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3055 if (p != NULL) *--p = '\0';
3058 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3060 if (++argc_pos == argc) usage(argv[0]);
3061 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3064 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3068 #endif /* defined(unix) */
3070 else if (argc_pos + 1 != argc)
3073 * This is neither the last command line
3074 * option, nor was it recognized before,
3075 * therefore it must be invalid.
3081 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3083 configfile = argv[argc_pos];
3086 } /* -END- while (more arguments) */
3089 if ( *configfile != '/' )
3091 char cwd[BUFFER_SIZE];
3093 size_t abs_file_size;
3095 /* make config-filename absolute here */
3096 if (NULL == getcwd(cwd, sizeof(cwd)))
3098 perror("failed to get current working directory");
3103 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3104 basedir = strdup(cwd);
3106 if (NULL == basedir ||
3107 NULL == (abs_file = malloc(abs_file_size)))
3109 perror("malloc failed");
3112 strlcpy(abs_file, basedir, abs_file_size);
3113 strlcat(abs_file, "/", abs_file_size );
3114 strlcat(abs_file, configfile, abs_file_size);
3115 configfile = abs_file;
3117 #endif /* defined unix */
3121 clients->next = NULL;
3123 /* XXX: factor out initialising after the next stable release. */
3126 #elif defined(_WIN32)
3130 /* Prepare mutexes if supported and necessary. */
3131 initialize_mutexes();
3133 /* Enable logging until further notice. */
3134 init_log_module(Argv[0]);
3136 random_seed = (unsigned int)time(NULL);
3138 srandom(random_seed);
3139 #elif defined (_WIN32)
3141 * See pick_from_range() in miscutil.c for details.
3143 log_error(LOG_LEVEL_INFO,
3144 "No thread-safe PRNG implemented for your platform. "
3145 "Using weak \'randomization\' factor which will "
3146 "limit the already questionable usefulness of "
3147 "header-time-randomizing actions (disabled by default).");
3150 #endif /* ifdef HAVE_RANDOM */
3153 * Unix signal handling
3155 * Catch the abort, interrupt and terminate signals for a graceful exit
3156 * Catch the hangup signal so the errlog can be reopened.
3157 * Ignore the broken pipe signals (FIXME: Why?)
3159 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3162 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3163 const int ignored_signals[] = { SIGPIPE, 0 };
3165 for (idx = 0; catched_signals[idx] != 0; idx++)
3167 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3168 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3170 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3171 #endif /* ifdef sun */
3173 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3177 for (idx = 0; ignored_signals[idx] != 0; idx++)
3179 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3181 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3186 #else /* ifdef _WIN32 */
3187 # ifdef _WIN_CONSOLE
3189 * We *are* in a windows console app.
3190 * Print a verbose messages about FAQ's and such
3192 printf("%s", win32_blurb);
3193 # endif /* def _WIN_CONSOLE */
3194 #endif /* def _WIN32 */
3197 /* Initialize the CGI subsystem */
3198 cgi_init_error_messages();
3201 * If runnig on unix and without the --nodaemon
3202 * option, become a daemon. I.e. fork, detach
3203 * from tty and get process group leadership
3216 if ( pid < 0 ) /* error */
3221 else if ( pid != 0 ) /* parent */
3226 * must check for errors
3227 * child died due to missing files aso
3230 wpid = waitpid( pid, &status, WNOHANG );
3239 /* Should be more portable, but not as well tested */
3244 #else /* ndef __FreeBSD__ */
3246 #endif /* ndef __FreeBSD__ */
3247 fd = open("/dev/tty", O_RDONLY);
3250 /* no error check here */
3251 ioctl( fd, TIOCNOTTY,0 );
3256 * stderr (fd 2) will be closed later on, when the
3257 * log file has been parsed.
3264 } /* -END- if (!no_daemon) */
3267 * As soon as we have written the PID file, we can switch
3268 * to the user and group ID indicated by the --user option
3274 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3276 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3282 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3284 /* Read the time zone file from /etc before doing chroot. */
3286 if (NULL != pre_chroot_nslookup_to_load_resolver
3287 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3289 /* Initialize resolver library. */
3290 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3292 if (chroot(pw->pw_dir) < 0)
3294 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3298 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3301 if (setuid(pw->pw_uid))
3303 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3307 char putenv_dummy[64];
3309 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3310 if (putenv(putenv_dummy) != 0)
3312 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3315 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3316 if (putenv(putenv_dummy) != 0)
3318 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3324 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3327 #endif /* defined unix */
3330 /* This will be FALSE unless the command line specified --service
3334 /* Yup, so now we must attempt to establish a connection
3335 * with the service dispatcher. This will only work if this
3336 * process was launched by the service control manager to
3337 * actually run as a service. If this isn't the case, i've
3338 * known it take around 30 seconds or so for the call to return.
3341 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3342 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3344 /* Service has run, and at this point is now being stopped, so just return */
3349 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3351 /* An error occurred. Usually it's because --service was wrongly specified
3352 * and we were unable to connect to the Service Control Dispatcher because
3353 * it wasn't expecting us and is therefore not listening.
3355 * For now, just continue below to call the listen_loop function.
3358 #endif /* def _WIN32 */
3368 /*********************************************************************
3370 * Function : bind_port_helper
3372 * Description : Bind the listen port. Handles logging, and aborts
3376 * 1 : config = Privoxy configuration. Specifies port
3379 * Returns : Port that was opened.
3381 *********************************************************************/
3382 static jb_socket bind_port_helper(struct configuration_spec * config)
3387 if (config->haddr == NULL)
3389 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3394 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3395 config->hport, config->haddr);
3398 result = bind_port(config->haddr, config->hport, &bfd);
3405 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3406 "There may be another Privoxy or some other "
3407 "proxy running on port %d",
3408 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3409 config->hport, config->hport);
3412 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3413 "The hostname is not resolvable",
3414 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3417 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3418 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3421 /* shouldn't get here */
3422 return JB_INVALID_SOCKET;
3425 config->need_bind = 0;
3432 /* Without this simple workaround we get this compiler warning from _beginthread
3433 * warning C4028: formal parameter 1 different from declaration
3435 void w32_service_listen_loop(void *p)
3439 #endif /* def _WIN32 */
3442 /*********************************************************************
3444 * Function : listen_loop
3446 * Description : bind the listen port and enter a "FOREVER" listening loop.
3452 *********************************************************************/
3453 static void listen_loop(void)
3455 struct client_state *csp = NULL;
3457 struct configuration_spec * config;
3459 config = load_config();
3461 bfd = bind_port_helper(config);
3463 #ifdef FEATURE_GRACEFUL_TERMINATION
3464 while (!g_terminate)
3469 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3470 while (waitpid(-1, NULL, WNOHANG) > 0)
3472 /* zombie children */
3474 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3477 * Free data that was used by died threads
3483 * Re-open the errlog after HUP signal
3485 if (received_hup_signal)
3487 init_error_log(Argv[0], config->logfile);
3488 received_hup_signal = 0;
3493 #ifdef FEATURE_COOKIE_JAR
3495 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3496 * already open. I think unload_configfile() is not being run, which should do
3497 * this work. Until that can get resolved, we'll use this workaround.
3501 if (csp->config->jar)
3503 fclose(csp->config->jar);
3504 csp->config->jar = NULL;
3506 #endif /* FEATURE_COOKIE_JAR */
3507 #endif /* __OS2__ */
3509 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3511 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3515 csp->flags |= CSP_FLAG_ACTIVE;
3516 csp->sfd = JB_INVALID_SOCKET;
3518 csp->config = config = load_config();
3520 if ( config->need_bind )
3523 * Since we were listening to the "old port", we will not see
3524 * a "listen" param change until the next IJB request. So, at
3525 * least 1 more request must be made for us to find the new
3526 * setting. I am simply closing the old socket and binding the
3529 * Which-ever is correct, we will serve 1 more page via the
3530 * old settings. This should probably be a "show-proxy-args"
3531 * request. This should not be a so common of an operation
3532 * that this will hurt people's feelings.
3537 bfd = bind_port_helper(config);
3540 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3542 if (!accept_connection(csp, bfd))
3544 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3557 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3560 #ifdef FEATURE_TOGGLE
3561 if (global_toggle_state)
3562 #endif /* def FEATURE_TOGGLE */
3564 csp->flags |= CSP_FLAG_TOGGLED_ON;
3567 if (run_loader(csp))
3569 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3570 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3574 if (block_acl(NULL,csp))
3576 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3577 close_socket(csp->cfd);
3581 #endif /* def FEATURE_ACL */
3583 /* add it to the list of clients */
3584 csp->next = clients->next;
3585 clients->next = csp;
3587 if (config->multi_threaded)
3591 /* this is a switch () statment in the C preprocessor - ugh */
3592 #undef SELECTED_ONE_OPTION
3594 /* Use Pthreads in preference to native code */
3595 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3596 #define SELECTED_ONE_OPTION
3598 pthread_t the_thread;
3599 pthread_attr_t attrs;
3601 pthread_attr_init(&attrs);
3602 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3603 errno = pthread_create(&the_thread, &attrs,
3604 (void * (*)(void *))serve, csp);
3605 child_id = errno ? -1 : 0;
3606 pthread_attr_destroy(&attrs);
3610 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3611 #define SELECTED_ONE_OPTION
3612 child_id = _beginthread(
3613 (void (*)(void *))serve,
3618 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3619 #define SELECTED_ONE_OPTION
3620 child_id = _beginthread(
3621 (void(* _Optlink)(void*))serve,
3627 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3628 #define SELECTED_ONE_OPTION
3630 thread_id tid = spawn_thread
3631 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3633 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3635 child_id = (int) tid;
3644 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3645 #define SELECTED_ONE_OPTION
3646 csp->cfd = ReleaseSocket(csp->cfd, -1);
3649 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3650 NP_Output, Output(),
3651 NP_CloseOutput, FALSE,
3652 NP_Name, (ULONG)"privoxy child",
3656 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3657 NP_Output, Output(),
3658 NP_CloseOutput, FALSE,
3659 NP_Name, (ULONG)"privoxy child",
3660 NP_StackSize, 200*1024,
3666 ((struct Task *)child_id)->tc_UserData = csp;
3667 Signal((struct Task *)child_id, SIGF_SINGLE);
3672 #if !defined(SELECTED_ONE_OPTION)
3675 /* This block is only needed when using fork().
3676 * When using threads, the server thread was
3677 * created and run by the call to _beginthread().
3679 if (child_id == 0) /* child */
3682 #ifdef FEATURE_TOGGLE
3683 int inherited_toggle_state = global_toggle_state;
3684 #endif /* def FEATURE_TOGGLE */
3689 * If we've been toggled or we've blocked the request, tell Mom
3692 #ifdef FEATURE_TOGGLE
3693 if (inherited_toggle_state != global_toggle_state)
3695 rc |= RC_FLAG_TOGGLED;
3697 #endif /* def FEATURE_TOGGLE */
3699 #ifdef FEATURE_STATISTICS
3700 if (csp->flags & CSP_FLAG_REJECTED)
3702 rc |= RC_FLAG_BLOCKED;
3704 #endif /* ndef FEATURE_STATISTICS */
3708 else if (child_id > 0) /* parent */
3710 /* in a fork()'d environment, the parent's
3711 * copy of the client socket and the CSP
3715 #if !defined(_WIN32) && !defined(__CYGWIN__)
3717 wait( &child_status );
3720 * Evaluate child's return code: If the child has
3721 * - been toggled, toggle ourselves
3722 * - blocked its request, bump up the stats counter
3725 #ifdef FEATURE_TOGGLE
3726 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3728 global_toggle_state = !global_toggle_state;
3730 #endif /* def FEATURE_TOGGLE */
3732 #ifdef FEATURE_STATISTICS
3734 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3738 #endif /* def FEATURE_STATISTICS */
3740 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3741 close_socket(csp->cfd);
3742 csp->flags &= ~CSP_FLAG_ACTIVE;
3746 #undef SELECTED_ONE_OPTION
3747 /* end of cpp switch () */
3749 if (child_id < 0) /* failed */
3751 char buf[BUFFER_SIZE];
3753 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3755 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3757 write_socket(csp->cfd, buf, strlen(buf));
3758 close_socket(csp->cfd);
3759 csp->flags &= ~CSP_FLAG_ACTIVE;
3770 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3772 /* Clean up. Aim: free all memory (no leaks) */
3773 #ifdef FEATURE_GRACEFUL_TERMINATION
3775 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3777 unload_current_config_file();
3778 unload_current_actions_file();
3779 unload_current_re_filterfile();
3780 #ifdef FEATURE_TRUST
3781 unload_current_trust_file();
3784 if (config->multi_threaded)
3791 } while ((clients->next != NULL) && (--i > 0));
3795 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3806 #ifdef FEATURE_COOKIE_JAR
3807 if (NULL != config->jar)
3809 fclose(config->jar);
3813 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3814 /* Cleanup - remove taskbar icon etc. */
3819 #endif /* FEATURE_GRACEFUL_TERMINATION */