1 const char jcc_rcs[] = "$Id: jcc.c,v 1.177 2008/05/10 11:51:12 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/jcc.c,v $
6 * Purpose : Main file. Contains main() method, main loop, and
7 * the main connection-handling function.
9 * Copyright : Written by and Copyright (C) 2001-2008 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 1.177 2008/05/10 11:51:12 fabiankeil
37 * Make the "read the rest of the headers" loop a bit more readable.
39 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
40 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
41 * - Remove useless comment.
43 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
44 * Fix comment grammar.
46 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
47 * Remove the pointless buffer in client_protocol_is_unsupported().
49 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
50 * Least-effort fix for bug #1821930 (reported by Lee):
51 * If the response doesn't look like HTTP,
52 * tell the client and log the problem.
54 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
55 * Don't pass the whole csp structure to flush_socket()
56 * when it only needs a file descriptor and a buffer.
58 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
59 * Remove kill-popups action.
61 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
62 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
64 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
65 * Remove the treat-forbidden-connects-like-blocks action. We now
66 * use the "blocked" page for forbidden CONNECT requests by default.
68 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
69 * Also use shiny new connect_port_is_forbidden() in jcc.c.
71 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
72 * Rename url_actions() to get_url_actions() and let it
73 * use the standard parameter ordering.
75 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
76 * Let forward_url() use the standard parameter ordering
77 * and mark its second parameter immutable.
79 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
80 * Remove the "Listening ... for local connections only" log message.
81 * Whether or not remote connections are able to reach Privoxy is up
82 * to the operating system.
84 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
85 * Prevent the log messages for CONNECT requests to unacceptable
86 * ports from printing the limit-connect argument as [null] if
87 * limit-connect hasn't been explicitly enabled.
89 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
90 * Make sure all console-mode apps get a usage() instance
92 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
93 * Reword NO_SERVER_DATA_RESPONSE to make it harder
94 * to misunderstand what the message is all about.
96 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
97 * Unbreak trustfile which previously didn't work without
98 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
100 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
101 * Plug memory leak. Spotted by Valgrind, triggered by
102 * Privoxy-Regression-Test feeding proxyfuzz.py.
104 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
105 * In the HTTP snipplets, refer to the client as client.
107 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
108 * Emit a log message when activating the MS IIS5 hack.
110 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
111 * Log the "weak randomization factor" warning only
112 * once for mingw32 and provide some more details.
114 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
115 * Initialize log module after initializing mutexes, future
116 * deadlocks in that code should now work cross-platform.
118 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
119 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
120 * Reported by Bert van Leeuwen in BR#1818808.
122 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
123 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
125 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
126 * When in daemon mode, close stderr after the configuration file has been
127 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
129 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
130 * - Fix a crash when parsing invalid requests whose first header
131 * is rejected by get_header(). Regression (re?)introduced
132 * in r1.143 by yours truly.
133 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
134 * client_cookie_adder() to make sure send-vanilla-wafer can be
135 * controlled through tags (and thus regression-tested).
137 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
138 * - Move get_filter_function() from jcc.c to filters.c
139 * so the filter functions can be static.
140 * - Don't bother filtering body-less responses.
142 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
143 * Execute content filters through execute_content_filter().
145 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
146 * Initialize req to NULL to make sure it's defined if the
147 * first read_socket() call fails. Reported by icmp30.
149 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
150 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
151 * extensive comments moved to user manual.
153 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
154 * Don't crash if a broken header filter wiped out the request line.
156 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
157 * Fix byte_count calculation in case of flushes
158 * and don't parse the server headers a second time.
160 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
161 * - If there's a connection problem after we already forwarded
162 * parts of the original content, just hang up. Fixes BR#1776724.
163 * - Fix warnings about unused code on mingw32.
164 * - In case of flushes, calculate the byte count
165 * less incorrectly (I think).
167 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
168 * Add some more prototypes for static functions.
170 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
171 * Comment out request_contains_null_bytes() until it's used again.
173 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
174 * #1763173 from Stefan Huehner: s@const static@static const@
175 * and declare some more functions static.
177 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
178 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
179 * and explain why they were rejected in the first place.
180 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
181 * CONNECT requests. The request line was missing.
182 * - Add two more XXX reminders as we don't have enough already.
184 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
185 * As Hal noticed, checking dispatch_cgi() as the last cruncher
186 * looks like a bug if CGI requests are blocked unintentionally,
187 * so don't do it unless the user enabled the new config option
188 * "allow-cgi-request-crunching".
190 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
191 * - Allow to rewrite the request destination behind the client's back.
192 * - Turn the weird-looking unconditional for loop that
193 * reads the client request into a conditional while loop.
194 * Move the stuff that only runs once out of the loop.
195 * - Move parts of chat(), server_content_type() and the
196 * necessary stuff to fix BR#1750917 into get_filter_function().
198 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
199 * Temporary workaround for BR#1730105.
201 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
202 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
203 * deadlocks and crashes on OpenBSD and possibly other OS with neither
204 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
205 * Thanks to Ralf Horstmann for report and solution.
207 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
208 * Add forward-override{} to change the forwarding settings through
209 * action sections. This is mainly interesting to forward different
210 * clients differently (for example based on User-Agent or request
213 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
214 * - Let usage() mention the --chroot parameter.
215 * - Use read_socket() consistently and always leave
216 * the last buffer byte alone, even in cases where
217 * null termination (currently) doesn't matter.
219 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
220 * - Fix config file loading on Unix if no config file is specified.
221 * Since r1.97 Privoxy would always interpret the last argument as
222 * config file, even if it's a valid command line option.
223 * - Abort in case of unrecognized command line options. Closes #1719696.
224 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
225 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
227 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
228 * - Don't rerun crunchers that only depend on the request URL.
229 * - Don't count redirects and CGI requests as "blocked requests".
231 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
232 * Support crunching based on tags created by server-header taggers.
234 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
235 * Make HTTP snippets static (again). Add a Content-Type for those
236 * with content so the browser doesn't guess it based on the URL.
238 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
239 * Move crunching and request line rebuilding out of chat().
241 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
242 * Introduce tags as alternative way to specify which
243 * actions apply to a request. At the moment tags can be
244 * created based on client and server headers.
246 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
247 * Don't CLF-log CONNECT requests twice.
249 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
250 * Log the source address for ACL-related connection drops.
252 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
253 * New config option: enforce-blocks.
255 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
256 * - Move null byte check into separate function.
257 * - Don't confuse the client with error pages
258 * if a CONNECT request was already confirmed.
260 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
261 * Speed up NULL byte escaping and only log the complete
262 * NULL byte requests with header debugging enabled.
264 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
265 * Answer requests that contain NULL bytes with
266 * a custom response instead of waiting for more
267 * data until the client eventually hangs up.
269 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
270 * - Move delivery and logging of crunched responses
271 * from chat() into send_crunch_response().
272 * - Display the reason for generating http_responses.
273 * - Log the content length for LOG_LEVEL_CLF correctly
274 * (still incorrect for some fixed responses).
275 * - Reword an incorrect comment about
276 * treat-forbidden-connects-like-blocks violating
278 * - Add some log messages.
280 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
281 * Move mutex initialization into separate
282 * function and exit in case of errors.
284 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
285 * - Start to reduce chat()'s line count and move
286 * parts of it into separate functions.
287 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
289 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
290 * - Add Proxy-Agent header to HTTP snippets that are
291 * supposed to reach HTTP clients only.
292 * - Made a few CONNECT log messages more descriptive.
293 * - Catch completely empty server responses (as seen
294 * with Tor's fake ".noconnect" top level domain).
295 * - Use shiny new "forwarding-failed" template for socks errors.
297 * Revision 1.118 2007/01/07 07:43:43 joergs
298 * AmigaOS4 support added.
300 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
301 * Added config option accept-intercepted-requests
302 * and disabled it by default.
304 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
305 * Reverted parts of my last commit
306 * to keep error handling working.
308 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
309 * Fixed gcc43 conversion warnings.
311 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
312 * Fix -pedantic ISO C warning about converting
313 * from function pointer to object pointer.
315 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
316 * Silence compiler warning I introduced with my last commit.
318 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
319 * Mutex protect rand() if POSIX threading
320 * is used, warn the user if that's not possible
321 * and stop using it on _WIN32 where it could
324 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
325 * Don't prevent core dumps by catching SIGABRT.
326 * It's rude and makes debugging unreasonable painful.
328 * Revision 1.110 2006/12/13 14:52:53 etresoft
329 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
331 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
332 * Privoxy is now able to run as intercepting
333 * proxy in combination with any packet filter
334 * that does the port redirection. The destination
335 * is extracted from the "Host:" header which
336 * should be available for nearly all requests.
338 * Moved HTTP snipplets into jcc.c.
339 * Added error message for gopher proxy requests.
341 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
342 * Only unlink the pidfile if it's actually used.
344 * Change order of interception checks to make
345 * it possible to block or redirect requests for
348 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
349 * Make pthread mutex locking more generic. Instead of
350 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
351 * and use mutex locking unless there is an _r function
352 * available. Better safe than sorry.
354 * Fixes "./configure --disable-pthread" and should result
355 * in less threading-related problems on pthread-using platforms,
356 * but it still doesn't fix BR#1122404.
358 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
359 * Move pthread.h inclusion from jcc.c to jcc.h.
360 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
362 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
363 * Don't exit after receiving the second SIGHUP on Solaris.
365 * Fixes BR 1052235, but the same problem may exist on other
366 * systems. Once 3.0.6 is out we should use sigset()
367 * where available and see if it breaks anything.
369 * Revision 1.104 2006/09/23 13:26:38 roro
370 * Replace TABs by spaces in source code.
372 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
373 * Fix +redirect{}. Didn't work with -fast-redirects.
375 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
376 * Respond with 400 and a short text message
377 * if the client tries to use Privoxy as FTP proxy.
379 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
380 * Make number of retries in case of forwarded-connect problems
381 * a config file option (forwarded-connect-retries) and use 0 as
384 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
385 * Set random(3) seed.
387 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
388 * Follow the OpenBSD port's lead and protect the resolve
389 * functions on OpenBSD as well.
391 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
392 * --user fix. Only use the user as group if no group is specified.
393 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
395 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
396 * Windows service (re-)integration
400 * --install[:service_name]
401 * --uninstall[:service_name]
404 * They work as follows:
405 * --install will create a service for you and then terminate.
406 * By default the service name will be "privoxy" (without the quotes).
407 * However you can run multiple services if you wish, just by adding
408 * a colon and then a name (no spaces).
410 * --uninstall follows the exact same rules a --install.
412 * --service is used when the program is executed by the service
413 * control manager, and in normal circumstances would never be
414 * used as a command line argument.
416 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
417 * Windows service integration
419 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
420 * Incorporate Fabian Keil's patch work:
421 http://www.fabiankeil.de/sourcecode/privoxy/
423 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
424 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
425 * with what was really the latest development (the v_3_0_branch branch)
427 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
428 * Thanks to Jindrich Makovicka for a race condition fix for the log
429 * file. The race condition remains for non-pthread implementations.
430 * Reference patch #1175720.
432 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
433 * Add the ability to check jpeg images for invalid
434 * lengths of comment blocks. Defensive strategy
435 * against the exploit:
436 * Microsoft Security Bulletin MS04-028
437 * Buffer Overrun in JPEG Processing (GDI+) Could
438 * Allow Code Execution (833987)
439 * Enabled with +inspect-jpegs in actions files.
441 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
442 * - Fixed usage info for non-unix platforms
443 * - Fixed small cmdline parsing bug
445 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
446 * Diagnostics: Now preserve the returncode of pthread_create
447 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
449 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
450 * No longer ignore SIGCHLD. Fixes bug #769381
452 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
453 * Close jarfile on graceful exit, remove stray line
455 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
456 * Cosmetics: Killed a warning, a typo and an allocation left at exit
458 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
459 * No longer rely on non-POSIX.1 extensions of getcwd().
462 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
463 * Replaced setenv() by posix-compliant putenv()
464 * Thanks to Neil McCalden (nmcc AT users.sf.net).
466 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
467 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
469 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
470 * Clean-up and extension of improvements for forked mode:
471 * - Child's return code now consists of flags RC_FLAG_*
472 * - Reporting toggle to parent now properly #ifdef'ed
473 * - Children now report blocking to parent. This enables
474 * statistics in forked mode
476 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
477 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
478 * Children now report having been toggled through _exit(17), parents
479 * watch for that code and toggle themselves if found.
481 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
482 * Wrapping all *_r functions (the non-_r versions of them) with
483 * mutex semaphores for OSX. Hopefully this will take care of all
484 * of those pesky crash reports.
486 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
487 * Fixed two mostly harmless mem leaks
489 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
490 * Fix: Head of global clients list now initialized to NULL
492 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
493 * Added basic support for OPTIONS and TRACE HTTP methods:
494 * - New interceptor direct_response() added in chat().
495 * - sed() moved to earlier in the process, so that the
496 * Host: header is evaluated before actions and forwarding
499 * Revision 1.92 2002/05/08 16:00:46 oes
500 * Chat's buffer handling:
501 * - Fixed bug with unchecked out-of-mem conditions
502 * while reading client request & server headers
503 * - No longer predict if the buffer limit will be exceeded
504 * in the next read -- check add_to_iob's new
505 * return code. If buffer couldn't be extended
506 * (policy or out-of-mem) while
507 * - reading from client: abort
508 * - reading server headers: send error page
509 * - buffering server body for filter: flush,
510 * and if that fails: send error page
512 * Revision 1.91 2002/04/08 20:35:58 swa
515 * Revision 1.90 2002/04/02 14:57:28 oes
516 * Made sending wafers independent of FEATURE_COOKIE_JAR
518 * Revision 1.89 2002/03/31 17:18:59 jongfoster
519 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
521 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
522 * More compiler warning message maintenance
524 * Revision 1.87 2002/03/26 22:29:54 swa
525 * we have a new homepage!
527 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
528 * Workaround for closing the jarfile before load_config() comes around again
530 * Revision 1.85 2002/03/24 15:23:33 jongfoster
533 * Revision 1.84 2002/03/24 13:25:43 swa
534 * name change related issues
536 * Revision 1.83 2002/03/16 23:54:06 jongfoster
537 * Adding graceful termination feature, to help look for memory leaks.
538 * If you enable this (which, by design, has to be done by hand
539 * editing config.h) and then go to http://i.j.b/die, then the program
540 * will exit cleanly after the *next* request. It should free all the
541 * memory that was used.
543 * Revision 1.82 2002/03/13 00:27:05 jongfoster
546 * Revision 1.81 2002/03/12 01:42:50 oes
547 * Introduced modular filters
549 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
550 * OS/2 port maintenance:
551 * - Fixed EMX build - it had decayed a little
552 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
553 * substituted a memset for now.
555 * Revision 1.79 2002/03/09 20:03:52 jongfoster
556 * - Making various functions return int rather than size_t.
557 * (Undoing a recent change). Since size_t is unsigned on
558 * Windows, functions like read_socket that return -1 on
559 * error cannot return a size_t.
561 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
562 * crashes, and also frequently caused JB to jump to 100%
563 * CPU and stay there. (Because it thought it had just
564 * read ((unsigned)-1) == 4Gb of data...)
566 * - The signature of write_socket has changed, it now simply
567 * returns success=0/failure=nonzero.
569 * - Trying to get rid of a few warnings --with-debug on
570 * Windows, I've introduced a new type "jb_socket". This is
571 * used for the socket file descriptors. On Windows, this
572 * is SOCKET (a typedef for unsigned). Everywhere else, it's
573 * an int. The error value can't be -1 any more, so it's
574 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
575 * Windows it maps to the #define INVALID_SOCKET.)
577 * - The signature of bind_port has changed.
579 * Revision 1.78 2002/03/08 21:35:04 oes
580 * Added optional group supplement to --user option. Will now use default group of user if no group given
582 * Revision 1.77 2002/03/07 03:52:06 oes
583 * - Fixed compiler warnings etc
584 * - Improved handling of failed DNS lookups
586 * Revision 1.76 2002/03/06 22:54:35 jongfoster
587 * Automated function-comment nitpicking.
589 * Revision 1.75 2002/03/06 10:02:19 oes
590 * Fixed stupid bug when --user was not given
592 * Revision 1.74 2002/03/06 00:49:31 jongfoster
593 * Fixing warning on Windows
594 * Making #ifdefs that refer to the same variable consistently
595 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
597 * Revision 1.73 2002/03/05 23:57:30 hal9
598 * Stray character 's' on line 1618 was breaking build.
600 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
601 * - Re-enable OS/2 building after new parms were added
602 * - Fix false out of memory report when resolving CGI templates when no IP
603 * address is available of failed attempt (a la no such domain)
605 * Revision 1.71 2002/03/05 18:13:56 oes
606 * Added --user option
608 * Revision 1.70 2002/03/05 04:52:42 oes
609 * Deleted non-errlog debugging code
611 * Revision 1.69 2002/03/04 23:50:00 jongfoster
612 * Splitting off bind_port() call into bind_port_helper(), with
615 * Revision 1.68 2002/03/04 20:17:32 oes
618 * Revision 1.67 2002/03/04 18:18:57 oes
619 * - Removed _DEBUG mode
620 * - Cleand up cmdline parsing
621 * - Introduced --no-daemon, --pidfile options
622 * - Cleaned up signal handling:
623 * - Terminate cleanly on INT, TERM and ABRT
624 * - Schedule logfile for re-opening on HUP
625 * - Ignore CHLD and PIPE
626 * - Leave the rest with their default handlers
627 * - Uniform handler registration
628 * - Added usage() function
629 * - Played styleguide police
631 * Revision 1.66 2002/03/03 15:06:55 oes
632 * Re-enabled automatic config reloading
634 * Revision 1.65 2002/03/03 14:49:11 oes
635 * Fixed CLF logging: Now uses client's original HTTP request
637 * Revision 1.64 2002/03/03 09:18:03 joergs
638 * Made jumbjuster work on AmigaOS again.
640 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
641 * Clean up a little CRLF unpleasantness that suddenly appeared
643 * Revision 1.62 2002/02/20 23:17:23 jongfoster
644 * Detecting some out-of memory conditions and exiting with a log message.
646 * Revision 1.61 2002/01/17 21:01:52 jongfoster
647 * Moving all our URL and URL pattern parsing code to urlmatch.c.
649 * Revision 1.60 2001/12/30 14:07:32 steudten
650 * - Add signal handling (unix)
651 * - Add SIGHUP handler (unix)
652 * - Add creation of pidfile (unix)
653 * - Add action 'top' in rc file (RH)
654 * - Add entry 'SIGNALS' to manpage
655 * - Add exit message to logfile (unix)
657 * Revision 1.59 2001/12/13 14:07:18 oes
658 * Fixed Bug: 503 error page now sent OK
660 * Revision 1.58 2001/11/30 23:37:24 jongfoster
661 * Renaming the Win32 config file to config.txt - this is almost the
662 * same as the corresponding UNIX name "config"
664 * Revision 1.57 2001/11/16 00:47:43 jongfoster
665 * Changing the tty-disconnection code to use setsid().
667 * Revision 1.56 2001/11/13 20:20:54 jongfoster
668 * Tabs->spaces, fixing a bug with missing {} around an if()
670 * Revision 1.55 2001/11/13 20:14:53 jongfoster
671 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
673 * Revision 1.54 2001/11/07 00:03:14 steudten
674 * Give reliable return value if an error
675 * occurs not just 0 with new daemon mode.
677 * Revision 1.53 2001/11/05 21:41:43 steudten
678 * Add changes to be a real daemon just for unix os.
679 * (change cwd to /, detach from controlling tty, set
680 * process group and session leader to the own process.
682 * Add some fatal-error log message for failed malloc().
683 * Add '-d' if compiled with 'configure --with-debug' to
684 * enable debug output.
686 * Revision 1.52 2001/10/26 20:11:20 jongfoster
687 * Fixing type mismatch
689 * Revision 1.51 2001/10/26 17:38:28 oes
692 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
693 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
694 * threads to call select() simultaneously. So, it's time to do a real, live,
695 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
696 * (native). Both versions will work, but using __OS2__ offers multi-threading.
698 * Revision 1.49 2001/10/23 21:41:35 jongfoster
699 * Added call to initialize the (statically-allocated of course)
700 * "out of memory" CGI response.
702 * Revision 1.48 2001/10/10 19:56:46 jongfoster
703 * Moving some code that wasn't cookie-related out of an #ifdef
706 * Revision 1.47 2001/10/10 16:44:36 oes
707 * Added CONNECT destination port limitation check
709 * Revision 1.46 2001/10/08 15:17:41 oes
710 * Re-enabled SSL forwarding
712 * Revision 1.45 2001/10/07 15:42:11 oes
713 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
715 * Moved downgrading of the HTTP version from parse_http_request to
716 * chat(), since we can't decide if it is necessary before we have
717 * determined the actions for the URL. The HTTP command is now
718 * *always* re-built so the repairs need no longer be special-cased.
720 * filter_popups now gets a csp pointer so it can raise the new
721 * CSP_FLAG_MODIFIED flag.
725 * Added configurable size limit for the IOB. If the IOB grows so
726 * large that the next read would exceed the limit, the header
727 * is generated, and the header & unfiltered buffer are flushed
728 * to the client. Chat then continues in non-buffering,
729 * non-filtering body mode.
731 * Revision 1.44 2001/10/02 18:13:57 oes
734 * Revision 1.43 2001/10/02 15:32:13 oes
735 * Moved generation of hdr
737 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
738 * Cleaning up 2 compiler warnings on OS/2.
740 * Revision 1.41 2001/09/16 17:05:14 jongfoster
741 * Removing unused #include showarg.h
743 * Revision 1.40 2001/09/16 15:41:45 jongfoster
744 * Fixing signed/unsigned comparison warning.
746 * Revision 1.39 2001/09/16 13:21:27 jongfoster
747 * Changes to use new list functions.
749 * Revision 1.38 2001/09/16 13:01:46 jongfoster
750 * Removing redundant function call that zeroed zalloc()'d memory.
752 * Revision 1.37 2001/09/10 11:12:24 oes
753 * Deleted unused variable
755 * Revision 1.36 2001/09/10 10:56:15 oes
756 * Silenced compiler warnings
758 * Revision 1.35 2001/07/31 14:44:22 oes
759 * Deleted unused size parameter from filter_popups()
761 * Revision 1.34 2001/07/30 22:08:36 jongfoster
762 * Tidying up #defines:
763 * - All feature #defines are now of the form FEATURE_xxx
764 * - Permanently turned off WIN_GUI_EDIT
765 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
767 * Revision 1.33 2001/07/29 19:32:00 jongfoster
768 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
770 * Revision 1.32 2001/07/29 18:47:05 jongfoster
771 * Adding missing #include "loadcfg.h"
773 * Revision 1.31 2001/07/29 12:17:48 oes
774 * Applied pthread fix by Paul Lieverse
776 * Revision 1.30 2001/07/25 22:57:13 jongfoster
777 * __BEOS__ no longer overrides FEATURE_PTHREAD.
778 * This is because FEATURE_PTHREAD will soon be widely used, so I
779 * want to keep it simple.
781 * Revision 1.29 2001/07/24 12:47:06 oes
782 * Applied BeOS support update by Eugenia
784 * Revision 1.28 2001/07/23 13:26:12 oes
785 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
787 * Revision 1.27 2001/07/19 19:09:47 haroon
788 * - Added code to take care of the situation where while processing the first
789 * server response (which includes the server header), after finding the end
790 * of the headers we were not looking past the end of the headers for
791 * content modification. I enabled it for filter_popups.
792 * Someone else should look to see if other similar operations should be
793 * done to the discarded portion of the buffer.
795 * Note 2001/07/20: No, the other content modification mechanisms will process
796 * the whole iob later anyway. --oes
798 * Revision 1.26 2001/07/18 12:31:36 oes
801 * Revision 1.25 2001/07/15 19:43:49 jongfoster
802 * Supports POSIX threads.
803 * Also removed some unused #includes.
805 * Revision 1.24 2001/07/13 14:00:40 oes
806 * - Generic content modification scheme:
807 * Each feature has its own applicability flag that is set
808 * from csp->action->flags.
809 * Replaced the "filtering" int flag , by a function pointer
810 * "content_filter" to the function that will do the content
811 * modification. If it is != NULL, the document will be buffered
812 * and processed through *content_filter, which must set
813 * csp->content_length and return a modified copy of the body
814 * or return NULL (on failiure).
815 * - Changed csp->is_text to the more generic bitmap csp->content_type
816 * which can currently take the valued CT_TEXT or CT_GIF
818 * - Removed all #ifdef PCRS
820 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
821 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
822 * the `block_acl' call. This prevents a compilation error when the user
823 * does not wish to use the "ACL" feature.
825 * Revision 1.22 2001/06/29 21:45:41 oes
826 * Indentation, CRLF->LF, Tab-> Space
828 * Revision 1.21 2001/06/29 13:29:36 oes
829 * - Cleaned up, improved comments
830 * - Unified all possible interceptors (CGI,
831 * block, trust, fast_redirect) in one
832 * place, with one (CGI) answer generation
833 * mechansim. Much clearer now.
834 * - Removed the GIF image generation, which
835 * is now done in filters.c:block_url()
836 * - Made error conditions like domain lookup
837 * failiure or (various) problems while talking
838 * to the server use cgi.c:error_response()
839 * instead of generating HTML/HTTP in chat() (yuck!)
840 * - Removed logentry from cancelled commit
842 * Revision 1.20 2001/06/09 10:55:28 jongfoster
843 * Changing BUFSIZ ==> BUFFER_SIZE
845 * Revision 1.19 2001/06/07 23:12:52 jongfoster
846 * Replacing function pointer in struct gateway with a directly
847 * called function forwarded_connect().
848 * Replacing struct gateway with struct forward_spec
850 * Revision 1.18 2001/06/03 19:12:16 oes
851 * introduced new cgi handling
853 * Revision 1.17 2001/06/01 20:07:23 jongfoster
854 * Now uses action +image-blocker{} rather than config->tinygif
856 * Revision 1.16 2001/06/01 18:49:17 jongfoster
857 * Replaced "list_share" with "list" - the tiny memory gain was not
858 * worth the extra complexity.
860 * Revision 1.15 2001/05/31 21:24:47 jongfoster
861 * Changed "permission" to "action" throughout.
862 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
863 * Moved vanilla wafer check into chat(), since we must now
864 * decide whether or not to add it based on the URL.
866 * Revision 1.14 2001/05/29 20:14:01 joergs
867 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
870 * Revision 1.13 2001/05/29 09:50:24 jongfoster
871 * Unified blocklist/imagelist/permissionslist.
872 * File format is still under discussion, but the internal changes
875 * Also modified interceptor behaviour:
876 * - We now intercept all URLs beginning with one of the following
877 * prefixes (and *only* these prefixes):
879 * * http://ijbswa.sf.net/config/
880 * * http://ijbswa.sourceforge.net/config/
881 * - New interceptors "home page" - go to http://i.j.b/ to see it.
882 * - Internal changes so that intercepted and fast redirect pages
883 * are not replaced with an image.
884 * - Interceptors now have the option to send a binary page direct
885 * to the client. (i.e. ijb-send-banner uses this)
886 * - Implemented show-url-info interceptor. (Which is why I needed
887 * the above interceptors changes - a typical URL is
888 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
889 * The previous mechanism would not have intercepted that, and
890 * if it had been intercepted then it then it would have replaced
893 * Revision 1.12 2001/05/27 22:17:04 oes
895 * - re_process_buffer no longer writes the modified buffer
896 * to the client, which was very ugly. It now returns the
897 * buffer, which it is then written by chat.
899 * - content_length now adjusts the Content-Length: header
900 * for modified documents rather than crunch()ing it.
901 * (Length info in csp->content_length, which is 0 for
902 * unmodified documents)
904 * - For this to work, sed() is called twice when filtering.
906 * Revision 1.11 2001/05/26 17:27:53 jongfoster
907 * Added support for CLF and fixed LOG_LEVEL_LOG.
908 * Also did CRLF->LF fix of my previous patch.
910 * Revision 1.10 2001/05/26 15:26:15 jongfoster
911 * ACL feature now provides more security by immediately dropping
912 * connections from untrusted hosts.
914 * Revision 1.9 2001/05/26 00:28:36 jongfoster
915 * Automatic reloading of config file.
916 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
917 * Most of the global variables have been moved to a new
918 * struct configuration_spec, accessed through csp->config->globalname
919 * Most of the globals remaining are used by the Win32 GUI.
921 * Revision 1.8 2001/05/25 22:43:18 jongfoster
922 * Fixing minor memory leak and buffer overflow.
924 * Revision 1.7 2001/05/25 22:34:30 jongfoster
927 * Revision 1.6 2001/05/23 00:13:58 joergs
928 * AmigaOS support fixed.
930 * Revision 1.5 2001/05/22 18:46:04 oes
932 * - Enabled filtering banners by size rather than URL
933 * by adding patterns that replace all standard banner
934 * sizes with the "Junkbuster" gif to the re_filterfile
936 * - Enabled filtering WebBugs by providing a pattern
937 * which kills all 1x1 images
939 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
940 * which is selected by the (nonstandard and therefore
941 * capital) letter 'U' in the option string.
942 * It causes the quantifiers to be ungreedy by default.
943 * Appending a ? turns back to greedy (!).
945 * - Added a new interceptor ijb-send-banner, which
946 * sends back the "Junkbuster" gif. Without imagelist or
947 * MSIE detection support, or if tinygif = 1, or the
948 * URL isn't recognized as an imageurl, a lame HTML
949 * explanation is sent instead.
951 * - Added new feature, which permits blocking remote
952 * script redirects and firing back a local redirect
954 * The feature is conditionally compiled, i.e. it
955 * can be disabled with --disable-fast-redirects,
956 * plus it must be activated by a "fast-redirects"
957 * line in the config file, has its own log level
958 * and of course wants to be displayed by show-proxy-args
959 * Note: Boy, all the #ifdefs in 1001 locations and
960 * all the fumbling with configure.in and acconfig.h
961 * were *way* more work than the feature itself :-(
963 * - Because a generic redirect template was needed for
964 * this, tinygif = 3 now uses the same.
966 * - Moved GIFs, and other static HTTP response templates
971 * - Removed some >400 CRs again (Jon, you really worked
974 * Revision 1.4 2001/05/21 19:34:01 jongfoster
975 * Made failure to bind() a fatal error.
977 * Revision 1.3 2001/05/20 01:21:20 jongfoster
978 * Version 2.9.4 checkin.
979 * - Merged popupfile and cookiefile, and added control over PCRS
980 * filtering, in new "permissionsfile".
981 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
982 * file error you now get a message box (in the Win32 GUI) rather
983 * than the program exiting with no explanation.
984 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
986 * - Removed tabs from "config"
987 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
988 * - Bumped up version number.
990 * Revision 1.2 2001/05/17 22:34:44 oes
991 * - Added hint on GIF char array generation to jcc.c
992 * - Cleaned CRLF's from the sources and related files
993 * - Repaired logging for REF and FRC
995 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
996 * Initial import of version 2.9.3 source tree
999 *********************************************************************/
1005 #include <sys/types.h>
1014 # ifndef FEATURE_PTHREAD
1018 # include <windows.h>
1019 # include <process.h>
1020 # endif /* ndef FEATURE_PTHREAD */
1023 # ifndef _WIN_CONSOLE
1024 # include "w32log.h"
1025 # endif /* ndef _WIN_CONSOLE */
1026 # include "w32svrapi.h"
1028 #else /* ifndef _WIN32 */
1030 # if !defined (__OS2__)
1031 # include <unistd.h>
1032 # include <sys/wait.h>
1033 # endif /* ndef __OS2__ */
1034 # include <sys/time.h>
1035 # include <sys/stat.h>
1036 # include <sys/ioctl.h>
1039 #include <sys/termios.h>
1047 # include <signal.h>
1050 # include <socket.h> /* BeOS has select() for sockets only. */
1051 # include <OS.h> /* declarations for threads and stuff. */
1054 # if defined(__EMX__) || defined(__OS2__)
1055 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1060 #define bzero(B,N) memset(B,0x00,n)
1064 # include <select.h>
1069 #include "project.h"
1072 #include "filters.h"
1073 #include "loaders.h"
1074 #include "parsers.h"
1075 #include "miscutil.h"
1077 #include "jbsockets.h"
1078 #include "gateway.h"
1079 #include "actions.h"
1081 #include "loadcfg.h"
1082 #include "urlmatch.h"
1084 const char jcc_h_rcs[] = JCC_H_VERSION;
1085 const char project_h_rcs[] = PROJECT_H_VERSION;
1088 struct client_state clients[1];
1089 struct file_list files[1];
1091 #ifdef FEATURE_STATISTICS
1092 int urls_read = 0; /* total nr of urls read inc rejected */
1093 int urls_rejected = 0; /* total nr of urls rejected */
1094 #endif /* def FEATURE_STATISTICS */
1096 #ifdef FEATURE_GRACEFUL_TERMINATION
1097 int g_terminate = 0;
1100 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1101 static void sig_handler(int the_signal);
1103 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1104 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1105 static jb_err get_server_headers(struct client_state *csp);
1106 static const char *crunch_reason(const struct http_response *rsp);
1107 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1109 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1111 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1112 static jb_err change_request_destination(struct client_state *csp);
1113 static void chat(struct client_state *csp);
1114 static void serve(struct client_state *csp);
1115 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1116 static void usage(const char *myname);
1118 static void initialize_mutexes(void);
1119 static jb_socket bind_port_helper(struct configuration_spec *config);
1120 static void listen_loop(void);
1123 void serve(struct client_state *csp);
1124 #else /* ifndef AMIGA */
1125 static void serve(struct client_state *csp);
1126 #endif /* def AMIGA */
1129 static int32 server_thread(void *data);
1130 #endif /* def __BEOS__ */
1133 #define sleep(N) Sleep(((N) * 1000))
1137 #define sleep(N) DosSleep(((N) * 100))
1140 #ifdef FEATURE_PTHREAD
1141 pthread_mutex_t log_mutex;
1142 pthread_mutex_t log_init_mutex;
1144 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1145 pthread_mutex_t resolver_mutex;
1146 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1148 #ifndef HAVE_GMTIME_R
1149 pthread_mutex_t gmtime_mutex;
1150 #endif /* ndef HAVE_GMTIME_R */
1152 #ifndef HAVE_LOCALTIME_R
1153 pthread_mutex_t localtime_mutex;
1154 #endif /* ndef HAVE_GMTIME_R */
1157 pthread_mutex_t rand_mutex;
1158 #endif /* ndef HAVE_RANDOM */
1160 #endif /* FEATURE_PTHREAD */
1162 #if defined(unix) || defined(__EMX__)
1163 const char *basedir = NULL;
1164 const char *pidfile = NULL;
1165 int received_hup_signal = 0;
1166 #endif /* defined unix */
1168 /* HTTP snipplets. */
1169 static const char CSUCCEED[] =
1170 "HTTP/1.0 200 Connection established\r\n"
1171 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1173 static const char CHEADER[] =
1174 "HTTP/1.0 400 Invalid header received from client\r\n"
1175 "Proxy-Agent: Privoxy " VERSION "\r\n"
1176 "Content-Type: text/plain\r\n"
1177 "Connection: close\r\n\r\n"
1178 "Invalid header received from client.\r\n";
1180 static const char FTP_RESPONSE[] =
1181 "HTTP/1.0 400 Invalid request received from client\r\n"
1182 "Content-Type: text/plain\r\n"
1183 "Connection: close\r\n\r\n"
1184 "Invalid request. Privoxy doesn't support FTP.\r\n";
1186 static const char GOPHER_RESPONSE[] =
1187 "HTTP/1.0 400 Invalid request received from client\r\n"
1188 "Content-Type: text/plain\r\n"
1189 "Connection: close\r\n\r\n"
1190 "Invalid request. Privoxy doesn't support gopher.\r\n";
1192 /* XXX: should be a template */
1193 static const char MISSING_DESTINATION_RESPONSE[] =
1194 "HTTP/1.0 400 Bad request received from client\r\n"
1195 "Proxy-Agent: Privoxy " VERSION "\r\n"
1196 "Content-Type: text/plain\r\n"
1197 "Connection: close\r\n\r\n"
1198 "Bad request. Privoxy was unable to extract the destination.\r\n";
1200 /* XXX: should be a template */
1201 static const char NO_SERVER_DATA_RESPONSE[] =
1202 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1203 "Proxy-Agent: Privoxy " VERSION "\r\n"
1204 "Content-Type: text/plain\r\n"
1205 "Connection: close\r\n\r\n"
1206 "Empty server or forwarder response.\r\n"
1207 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1209 /* XXX: should be a template */
1210 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1211 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1212 "Proxy-Agent: Privoxy " VERSION "\r\n"
1213 "Content-Type: text/plain\r\n"
1214 "Connection: close\r\n\r\n"
1215 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1218 /* XXX: should be a template */
1219 static const char NULL_BYTE_RESPONSE[] =
1220 "HTTP/1.0 400 Bad request received from client\r\n"
1221 "Proxy-Agent: Privoxy " VERSION "\r\n"
1222 "Content-Type: text/plain\r\n"
1223 "Connection: close\r\n\r\n"
1224 "Bad request. Null byte(s) before end of request.\r\n";
1227 /* XXX: should be a template */
1228 static const char MESSED_UP_REQUEST_RESPONSE[] =
1229 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1230 "Proxy-Agent: Privoxy " VERSION "\r\n"
1231 "Content-Type: text/plain\r\n"
1232 "Connection: close\r\n\r\n"
1233 "Bad request. Messed up with header filters.\r\n";
1235 /* A function to crunch a response */
1236 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1238 /* Crunch function flags */
1239 #define CF_NO_FLAGS 0
1240 /* Cruncher applies to forced requests as well */
1241 #define CF_IGNORE_FORCE 1
1242 /* Crunched requests are counted for the block statistics */
1243 #define CF_COUNT_AS_REJECT 2
1245 /* A crunch function and its flags */
1248 const crunch_func_ptr cruncher;
1252 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1254 /* Complete list of cruncher functions */
1255 static const struct cruncher crunchers_all[] = {
1256 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1257 { block_url, CF_COUNT_AS_REJECT },
1258 #ifdef FEATURE_TRUST
1259 { trust_url, CF_COUNT_AS_REJECT },
1260 #endif /* def FEATURE_TRUST */
1261 { redirect_url, CF_NO_FLAGS },
1262 { dispatch_cgi, CF_IGNORE_FORCE},
1266 /* Light version, used after tags are applied */
1267 static const struct cruncher crunchers_light[] = {
1268 { block_url, CF_COUNT_AS_REJECT },
1269 { redirect_url, CF_NO_FLAGS },
1274 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1275 /*********************************************************************
1277 * Function : sig_handler
1279 * Description : Signal handler for different signals.
1280 * Exit gracefully on TERM and INT
1281 * or set a flag that will cause the errlog
1282 * to be reopened by the main thread on HUP.
1285 * 1 : the_signal = the signal cause this function to call
1289 *********************************************************************/
1290 static void sig_handler(int the_signal)
1296 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1307 received_hup_signal = 1;
1312 * We shouldn't be here, unless we catch signals
1313 * in main() that we can't handle here!
1315 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1323 /*********************************************************************
1325 * Function : client_protocol_is_unsupported
1327 * Description : Checks if the client used a known unsupported
1328 * protocol and deals with it by sending an error
1332 * 1 : csp = Current client state (buffers, headers, etc...)
1333 * 2 : req = the first request line send by the client
1335 * Returns : TRUE if an error response has been generated, or
1336 * FALSE if the request doesn't look invalid.
1338 *********************************************************************/
1339 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1342 * If it's a FTP or gopher request, we don't support it.
1344 * These checks are better than nothing, but they might
1345 * not work in all configurations and some clients might
1346 * have problems digesting the answer.
1348 * They should, however, never cause more problems than
1349 * Privoxy's old behaviour (returning the misleading HTML
1352 * "Could not resolve http://(ftp|gopher)://example.org").
1354 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1356 const char *response = NULL;
1357 const char *protocol = NULL;
1359 if (!strncmpic(req, "GET ftp://", 10))
1361 response = FTP_RESPONSE;
1366 response = GOPHER_RESPONSE;
1367 protocol = "GOPHER";
1369 log_error(LOG_LEVEL_ERROR,
1370 "%s tried to use Privoxy as %s proxy: %s",
1371 csp->ip_addr_str, protocol, req);
1372 log_error(LOG_LEVEL_CLF,
1373 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1375 write_socket(csp->cfd, response, strlen(response));
1384 /*********************************************************************
1386 * Function : get_request_destination_elsewhere
1388 * Description : If the client's request was redirected into
1389 * Privoxy without the client's knowledge,
1390 * the request line lacks the destination host.
1392 * This function tries to get it elsewhere,
1393 * provided accept-intercepted-requests is enabled.
1395 * "Elsewhere" currently only means "Host: header",
1396 * but in the future we may ask the redirecting
1397 * packet filter to look the destination up.
1399 * If the destination stays unknown, an error
1400 * response is send to the client and headers
1401 * are freed so that chat() can return directly.
1404 * 1 : csp = Current client state (buffers, headers, etc...)
1405 * 2 : headers = a header list
1407 * Returns : JB_ERR_OK if the destination is now known, or
1408 * JB_ERR_PARSE if it isn't.
1410 *********************************************************************/
1411 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1415 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1417 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1418 " Privoxy isn't configured to accept intercepted requests.",
1419 csp->ip_addr_str, csp->http->cmd);
1420 /* XXX: Use correct size */
1421 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1422 csp->ip_addr_str, csp->http->cmd);
1424 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1425 destroy_list(headers);
1427 return JB_ERR_PARSE;
1429 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1431 /* Split the domain we just got for pattern matching */
1432 init_domain_components(csp->http);
1438 /* We can't work without destination. Go spread the news.*/
1440 req = list_to_text(headers);
1442 /* XXX: Use correct size */
1443 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1444 csp->ip_addr_str, csp->http->cmd);
1445 log_error(LOG_LEVEL_ERROR,
1446 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1447 csp->ip_addr_str, csp->http->cmd, req);
1450 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1451 destroy_list(headers);
1453 return JB_ERR_PARSE;
1456 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1457 * to get the destination IP address, use it as host directly
1458 * or do a reverse DNS lookup first.
1463 /*********************************************************************
1465 * Function : get_server_headers
1467 * Description : Parses server headers in iob and fills them
1468 * into csp->headers so that they can later be
1472 * 1 : csp = Current client state (buffers, headers, etc...)
1474 * Returns : JB_ERR_OK if everything went fine, or
1475 * JB_ERR_PARSE if the headers were incomplete.
1477 *********************************************************************/
1478 static jb_err get_server_headers(struct client_state *csp)
1480 int continue_hack_in_da_house = 0;
1483 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1488 * continue hack in da house. Ignore the ending of
1489 * this head and continue enlisting header lines.
1490 * The reason is described below.
1492 enlist(csp->headers, "");
1493 continue_hack_in_da_house = 0;
1496 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1499 * It's a bodyless continue response, don't
1500 * stop header parsing after reaching it's end.
1502 * As a result Privoxy will concatenate the
1503 * next response's head and parse and deliver
1504 * the headers as if they belonged to one request.
1506 * The client will separate them because of the
1507 * empty line between them.
1509 * XXX: What we're doing here is clearly against
1510 * the intended purpose of the continue header,
1511 * and under some conditions (HTTP/1.0 client request)
1512 * it's a standard violation.
1514 * Anyway, "sort of against the spec" is preferable
1515 * to "always getting confused by Continue responses"
1516 * (Privoxy's behaviour before this hack was added)
1518 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1519 continue_hack_in_da_house = 1;
1521 else if (*header == '\0')
1524 * If the header is empty, but the Continue hack
1525 * isn't active, we can assume that we reached the
1526 * end of the buffer before we hit the end of the
1529 * Inform the caller an let it decide how to handle it.
1531 return JB_ERR_PARSE;
1534 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1537 * XXX: Should we quit the request and return a
1538 * out of memory error page instead?
1540 log_error(LOG_LEVEL_ERROR,
1541 "Out of memory while enlisting server headers. %s lost.",
1551 /*********************************************************************
1553 * Function : crunch_reason
1555 * Description : Translates the crunch reason code into a string.
1558 * 1 : rsp = a http_response
1560 * Returns : A string with the crunch reason or an error description.
1562 *********************************************************************/
1563 static const char *crunch_reason(const struct http_response *rsp)
1565 char * reason = NULL;
1567 assert(rsp != NULL);
1570 return "Internal error while searching for crunch reason";
1573 switch (rsp->reason)
1575 case RSP_REASON_UNSUPPORTED:
1576 reason = "Unsupported HTTP feature";
1578 case RSP_REASON_BLOCKED:
1581 case RSP_REASON_UNTRUSTED:
1582 reason = "Untrusted";
1584 case RSP_REASON_REDIRECTED:
1585 reason = "Redirected";
1587 case RSP_REASON_CGI_CALL:
1588 reason = "CGI Call";
1590 case RSP_REASON_NO_SUCH_DOMAIN:
1591 reason = "DNS failure";
1593 case RSP_REASON_FORWARDING_FAILED:
1594 reason = "Forwarding failed";
1596 case RSP_REASON_CONNECT_FAILED:
1597 reason = "Connection failure";
1599 case RSP_REASON_OUT_OF_MEMORY:
1600 reason = "Out of memory (may mask other reasons)";
1603 reason = "No reason recorded";
1611 /*********************************************************************
1613 * Function : send_crunch_response
1615 * Description : Delivers already prepared response for
1616 * intercepted requests, logs the interception
1617 * and frees the response.
1620 * 1 : csp = Current client state (buffers, headers, etc...)
1621 * 1 : rsp = Fully prepared response. Will be freed on exit.
1623 * Returns : Nothing.
1625 *********************************************************************/
1626 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1628 const struct http_request *http = csp->http;
1629 char status_code[4];
1631 assert(rsp != NULL);
1632 assert(rsp->head != NULL);
1637 * Not supposed to happen. If it does
1638 * anyway, treat it as an unknown error.
1640 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1641 /* return code doesn't matter */
1646 /* If rsp is still NULL, we have serious internal problems. */
1647 log_error(LOG_LEVEL_FATAL,
1648 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1652 * Extract the status code from the actual head
1653 * that was send to the client. It is the only
1654 * way to get it right for all requests, including
1655 * the fixed ones for out-of-memory problems.
1657 * A head starts like this: 'HTTP/1.1 200...'
1661 status_code[0] = rsp->head[9];
1662 status_code[1] = rsp->head[10];
1663 status_code[2] = rsp->head[11];
1664 status_code[3] = '\0';
1666 /* Write the answer to the client */
1667 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1668 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1670 /* There is nothing we can do about it. */
1671 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1674 /* Log that the request was crunched and why. */
1675 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1676 http->hostport, http->path, crunch_reason(rsp));
1677 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1678 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1680 /* Clean up and return */
1681 if (cgi_error_memory() != rsp)
1683 free_http_response(rsp);
1690 /*********************************************************************
1692 * Function : request_contains_null_bytes
1694 * Description : Checks for NULL bytes in the request and sends
1695 * an error message to the client if any were found.
1697 * XXX: currently not used, see comment in chat().
1700 * 1 : csp = Current client state (buffers, headers, etc...)
1701 * 2 : buf = Data from the client's request to check.
1702 * 3 : len = The data length.
1704 * Returns : TRUE if the request contained one or more NULL bytes, or
1707 *********************************************************************/
1708 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1710 size_t c_len; /* Request lenght when treated as C string */
1712 c_len = strlen(buf);
1717 * Null byte(s) found. Log the request,
1718 * return an error response and hang up.
1720 size_t tmp_len = c_len;
1725 * Replace NULL byte(s) with '°' characters
1726 * so the request can be logged as string.
1727 * XXX: Is there a better replacement character?
1730 tmp_len += strlen(buf+tmp_len);
1731 } while (tmp_len < len);
1733 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1734 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1735 log_error(LOG_LEVEL_HEADER,
1736 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1738 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1740 /* XXX: Log correct size */
1741 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1751 /*********************************************************************
1753 * Function : crunch_response_triggered
1755 * Description : Checks if the request has to be crunched,
1756 * and delivers the crunch response if necessary.
1759 * 1 : csp = Current client state (buffers, headers, etc...)
1760 * 2 : crunchers = list of cruncher functions to run
1762 * Returns : TRUE if the request was answered with a crunch response
1765 *********************************************************************/
1766 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1768 struct http_response *rsp = NULL;
1769 const struct cruncher *c;
1772 * If CGI request crunching is disabled,
1773 * check the CGI dispatcher out of order to
1774 * prevent unintentional blocks or redirects.
1776 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1777 && (NULL != (rsp = dispatch_cgi(csp))))
1779 /* Deliver, log and free the interception response. */
1780 send_crunch_response(csp, rsp);
1784 for (c = crunchers; c->cruncher != NULL; c++)
1787 * Check the cruncher if either Privoxy is toggled
1788 * on and the request isn't forced, or if the cruncher
1789 * applies to forced requests as well.
1791 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1792 !(csp->flags & CSP_FLAG_FORCED)) ||
1793 (c->flags & CF_IGNORE_FORCE))
1795 rsp = c->cruncher(csp);
1798 /* Deliver, log and free the interception response. */
1799 send_crunch_response(csp, rsp);
1800 #ifdef FEATURE_STATISTICS
1801 if (c->flags & CF_COUNT_AS_REJECT)
1803 csp->flags |= CSP_FLAG_REJECTED;
1805 #endif /* def FEATURE_STATISTICS */
1816 /*********************************************************************
1818 * Function : build_request_line
1820 * Description : Builds the HTTP request line.
1822 * If a HTTP forwarder is used it expects the whole URL,
1823 * web servers only get the path.
1826 * 1 : csp = Current client state (buffers, headers, etc...)
1827 * 2 : fwd = The forwarding spec used for the request
1828 * XXX: Should use http->fwd instead.
1829 * 3 : request_line = The old request line which will be replaced.
1831 * Returns : Nothing. Terminates in case of memory problems.
1833 *********************************************************************/
1834 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1836 struct http_request *http = csp->http;
1838 assert(http->ssl == 0);
1841 * Downgrade http version from 1.1 to 1.0
1842 * if +downgrade action applies.
1844 if ( (csp->action->flags & ACTION_DOWNGRADE)
1845 && (!strcmpic(http->ver, "HTTP/1.1")))
1848 http->ver = strdup("HTTP/1.0");
1850 if (http->ver == NULL)
1852 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1857 * Rebuild the request line.
1859 freez(*request_line);
1860 *request_line = strdup(http->gpc);
1861 string_append(request_line, " ");
1863 if (fwd->forward_host)
1865 string_append(request_line, http->url);
1869 string_append(request_line, http->path);
1871 string_append(request_line, " ");
1872 string_append(request_line, http->ver);
1874 if (*request_line == NULL)
1876 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1878 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1882 /*********************************************************************
1884 * Function : change_request_destination
1886 * Description : Parse a (rewritten) request line and regenerate
1887 * the http request data.
1890 * 1 : csp = Current client state (buffers, headers, etc...)
1892 * Returns : Forwards the parse_http_request() return code.
1893 * Terminates in case of memory problems.
1895 *********************************************************************/
1896 static jb_err change_request_destination(struct client_state *csp)
1898 struct http_request *http = csp->http;
1901 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1902 free_http_request(http);
1903 err = parse_http_request(csp->headers->first->str, http, csp);
1904 if (JB_ERR_OK != err)
1906 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1907 jb_err_to_string(err));
1909 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1910 if (http->ocmd == NULL)
1912 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1919 /*********************************************************************
1923 * Description : Once a connection to the client has been accepted,
1924 * this function is called (via serve()) to handle the
1925 * main business of the communication. When this
1926 * function returns, the caller must close the client
1929 * FIXME: chat is nearly thousand lines long.
1933 * 1 : csp = Current client state (buffers, headers, etc...)
1935 * Returns : Nothing.
1937 *********************************************************************/
1938 static void chat(struct client_state *csp)
1940 char buf[BUFFER_SIZE];
1948 int ms_iis5_hack = 0;
1949 size_t byte_count = 0;
1950 int forwarded_connect_retries = 0;
1951 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1952 const struct forward_spec * fwd;
1953 struct http_request *http;
1954 int len; /* for buffer sizes (and negative error codes) */
1957 /* Function that does the content filtering for the current request */
1958 filter_function_ptr content_filter = NULL;
1960 /* Skeleton for HTTP response, if we should intercept the request */
1961 struct http_response *rsp;
1963 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1964 struct list header_list;
1965 struct list *headers = &header_list;
1969 memset(buf, 0, sizeof(buf));
1972 * Read the client's request. Note that since we're not using select() we
1973 * could get blocked here if a client connected, then didn't say anything!
1978 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1980 if (len <= 0) break; /* error! */
1983 * If there is no memory left for buffering the
1984 * request, there is nothing we can do but hang up
1986 if (add_to_iob(csp, buf, len))
1991 req = get_header(csp->iob);
1993 } while ((NULL != req) && ('\0' == *req));
1995 if ((NULL != req) && ('\0' != *req))
1997 /* Request received. Validate and parse it. */
2001 * XXX: Temporary disabled to prevent problems
2002 * with POST requests whose bodies are allowed to
2003 * contain NULL bytes. BR#1730105.
2005 * The main purpose of this check is to properly
2006 * log stuff like BitTorrent traffic and other junk
2007 * that hits public proxies. It's not required for
2008 * Privoxy to functions as those requests are discarded
2011 * It probably should be rewritten to only check
2012 * the head of the request. Another option would
2013 * be to let all POST requests pass, although that
2014 * may not be good enough.
2016 if (request_contains_null_bytes(csp, buf, len))
2018 /* NULL bytes found and dealt with, just hang up. */
2023 /* Does the request line look invalid? */
2024 if (client_protocol_is_unsupported(csp, req))
2027 * Yes. The request has already been
2028 * answered with a error response, the buffers
2029 * were freed and we're done with chatting.
2034 #ifdef FEATURE_FORCE_LOAD
2036 * If this request contains the FORCE_PREFIX and blocks
2037 * aren't enforced, get rid of it and set the force flag.
2039 if (strstr(req, FORCE_PREFIX))
2041 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2043 log_error(LOG_LEVEL_FORCE,
2044 "Ignored force prefix in request: \"%s\".", req);
2048 strclean(req, FORCE_PREFIX);
2049 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2050 csp->flags |= CSP_FLAG_FORCED;
2054 #endif /* def FEATURE_FORCE_LOAD */
2055 err = parse_http_request(req, http, csp);
2056 if (JB_ERR_OK != err)
2058 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2064 if (http->cmd == NULL)
2066 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2067 /* XXX: Use correct size */
2068 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2069 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2071 free_http_request(http);
2075 /* grab the rest of the client's headers */
2079 p = get_header(csp->iob);
2083 /* There are no additional headers to read. */
2090 * We didn't receive a complete header
2091 * line yet, get the rest of it.
2093 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2096 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2097 destroy_list(headers);
2101 if (add_to_iob(csp, buf, len))
2104 * If there is no memory left for buffering the
2105 * request, there is nothing we can do but hang up
2107 destroy_list(headers);
2114 * We were able to read a complete
2115 * header and can finaly enlist it.
2122 if (http->host == NULL)
2125 * If we still don't know the request destination,
2126 * the request is invalid or the client uses
2127 * Privoxy without its knowledge.
2129 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2132 * Our attempts to get the request destination
2133 * elsewhere failed or Privoxy is configured
2134 * to only accept proxy requests.
2136 * An error response has already been send
2137 * and we're done here.
2144 * Determine the actions for this URL
2146 #ifdef FEATURE_TOGGLE
2147 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2149 /* Most compatible set of actions (i.e. none) */
2150 init_current_action(csp->action);
2153 #endif /* ndef FEATURE_TOGGLE */
2155 get_url_actions(csp, http);
2159 * Save a copy of the original request for logging
2161 http->ocmd = strdup(http->cmd);
2163 if (http->ocmd == NULL)
2165 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2168 enlist(csp->headers, http->cmd);
2170 /* Append the previously read headers */
2171 list_append_list_unique(csp->headers, headers);
2172 destroy_list(headers);
2174 err = sed(client_patterns, add_client_headers, csp);
2175 if (JB_ERR_OK != err)
2177 assert(err == JB_ERR_PARSE);
2178 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2180 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2182 /* Check request line for rewrites. */
2183 if ((NULL == csp->headers->first->str)
2184 || (strcmp(http->cmd, csp->headers->first->str) &&
2185 (JB_ERR_OK != change_request_destination(csp))))
2188 * A header filter broke the request line - bail out.
2190 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2191 /* XXX: Use correct size */
2192 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2193 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2195 free_http_request(http);
2199 /* decide how to route the HTTP request */
2200 fwd = forward_url(csp, http);
2203 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2204 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2208 * build the http request to send to the server
2209 * we have to do one of the following:
2211 * create = use the original HTTP request to create a new
2212 * HTTP request that has either the path component
2213 * without the http://domainspec (w/path) or the
2214 * full orininal URL (w/url)
2215 * Note that the path and/or the HTTP version may
2216 * have been altered by now.
2218 * connect = Open a socket to the host:port of the server
2219 * and short-circuit server and client socket.
2221 * pass = Pass the request unchanged if forwarding a CONNECT
2222 * request to a parent proxy. Note that we'll be sending
2223 * the CFAIL message ourselves if connecting to the parent
2224 * fails, but we won't send a CSUCCEED message if it works,
2225 * since that would result in a double message (ours and the
2226 * parent's). After sending the request to the parent, we simply
2229 * here's the matrix:
2232 * +--------+--------+
2234 * 0 | create | connect|
2236 * Forwarding +--------+--------+
2238 * 1 | create | pass |
2240 * +--------+--------+
2244 if (http->ssl && connect_port_is_forbidden(csp))
2246 const char *acceptable_connect_ports =
2247 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2248 assert(NULL != acceptable_connect_ports);
2249 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2250 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2251 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2252 csp->action->flags |= ACTION_BLOCK;
2258 freez(csp->headers->first->str);
2259 build_request_line(csp, fwd, &csp->headers->first->str);
2262 hdr = list_to_text(csp->headers);
2265 /* FIXME Should handle error properly */
2266 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2270 * We have a request. Check if one of the crunchers wants it.
2272 if (crunch_response_triggered(csp, crunchers_all))
2275 * Yes. The client got the crunch response
2276 * and we are done here after cleaning up.
2279 list_remove_all(csp->headers);
2285 * The headers can't be removed earlier because
2286 * they were still needed for the referrer check
2287 * in case of CGI crunches.
2289 * XXX: Would it be worth to move the referrer check
2290 * into client_referrer() and set a flag if it's trusted?
2292 list_remove_all(csp->headers);
2294 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2296 if (fwd->forward_host)
2298 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2299 fwd->forward_host, fwd->forward_port, http->hostport);
2303 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2306 /* here we connect to the server, gateway, or the forwarder */
2308 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2309 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2311 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2312 forwarded_connect_retries, http->hostport);
2315 if (csp->sfd == JB_INVALID_SOCKET)
2317 if (fwd->type != SOCKS_NONE)
2320 rsp = error_response(csp, "forwarding-failed", errno);
2322 else if (errno == EINVAL)
2324 rsp = error_response(csp, "no-such-domain", errno);
2328 rsp = error_response(csp, "connect-failed", errno);
2329 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2334 /* Write the answer to the client */
2337 send_crunch_response(csp, rsp);
2344 if (fwd->forward_host || (http->ssl == 0))
2346 /* write the client's (modified) header to the server
2347 * (along with anything else that may be in the buffer)
2350 if (write_socket(csp->sfd, hdr, strlen(hdr))
2351 || (flush_socket(csp->sfd, csp->iob) < 0))
2353 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2356 rsp = error_response(csp, "connect-failed", errno);
2360 send_crunch_response(csp, rsp);
2370 * We're running an SSL tunnel and we're not forwarding,
2371 * so just send the "connect succeeded" message to the
2372 * client, flush the rest, and get out of the way.
2374 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2382 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2384 /* we're finished with the client's header */
2387 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2389 /* pass data between the client and server
2390 * until one or the other shuts down the connection.
2399 * FD_ZERO here seems to point to an errant macro which crashes.
2400 * So do this by hand for now...
2402 memset(&rfds,0x00,sizeof(fd_set));
2406 FD_SET(csp->cfd, &rfds);
2407 FD_SET(csp->sfd, &rfds);
2409 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2413 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2417 /* this is the body of the browser's request
2418 * just read it and write it.
2421 if (FD_ISSET(csp->cfd, &rfds))
2423 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2427 break; /* "game over, man" */
2430 if (write_socket(csp->sfd, buf, (size_t)len))
2432 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2439 * The server wants to talk. It could be the header or the body.
2440 * If `hdr' is null, then it's the header otherwise it's the body.
2441 * FIXME: Does `hdr' really mean `host'? No.
2445 if (FD_ISSET(csp->sfd, &rfds))
2448 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2452 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2454 if (http->ssl && (fwd->forward_host == NULL))
2457 * Just hang up. We already confirmed the client's CONNECT
2458 * request with status code 200 and unencrypted content is
2459 * no longer welcome.
2461 log_error(LOG_LEVEL_ERROR,
2462 "CONNECT already confirmed. Unable to tell the client about the problem.");
2465 else if (byte_count)
2468 * Just hang up. We already transmitted the original headers
2469 * and parts of the original content and therefore missed the
2470 * chance to send an error message (without risking data corruption).
2472 * XXX: we could retry with a fancy range request here.
2474 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2475 "Unable to tell the client about the problem.");
2479 rsp = error_response(csp, "connect-failed", errno);
2483 send_crunch_response(csp, rsp);
2489 /* Add a trailing zero. This lets filter_popups
2490 * use string operations.
2494 /* Normally, this would indicate that we've read
2495 * as much as the server has sent us and we can
2496 * close the client connection. However, Microsoft
2497 * in its wisdom has released IIS/5 with a bug that
2498 * prevents it from sending the trailing \r\n in
2499 * a 302 redirect header (and possibly other headers).
2500 * To work around this if we've haven't parsed
2501 * a full header we'll append a trailing \r\n
2502 * and see if this now generates a valid one.
2504 * This hack shouldn't have any impacts. If we've
2505 * already transmitted the header or if this is a
2506 * SSL connection, then we won't bother with this
2507 * hack. So we only work on partially received
2508 * headers. If we append a \r\n and this still
2509 * doesn't generate a valid header, then we won't
2510 * transmit anything to the client.
2515 if (server_body || http->ssl)
2518 * If we have been buffering up the document,
2519 * now is the time to apply content modification
2520 * and send the result to the client.
2524 p = execute_content_filter(csp, content_filter);
2526 * If the content filter fails, use the original
2527 * buffer and length.
2528 * (see p != NULL ? p : csp->iob->cur below)
2532 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2535 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2537 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2540 hdr = list_to_text(csp->headers);
2543 /* FIXME Should handle error properly */
2544 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2548 * Shouldn't happen because this was the second sed run
2549 * and tags are only created for the first one.
2551 assert(!crunch_response_triggered(csp, crunchers_all));
2553 if (write_socket(csp->cfd, hdr, strlen(hdr))
2554 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2556 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2566 break; /* "game over, man" */
2570 * This is NOT the body, so
2571 * Let's pretend the server just sent us a blank line.
2573 snprintf(buf, sizeof(buf), "\r\n");
2574 len = (int)strlen(buf);
2577 * Now, let the normal header parsing algorithm below do its
2578 * job. If it fails, we'll exit instead of continuing.
2585 * If this is an SSL connection or we're in the body
2586 * of the server document, just write it to the client,
2587 * unless we need to buffer the body for later content-filtering
2590 if (server_body || http->ssl)
2595 * If there is no memory left for buffering the content, or the buffer limit
2596 * has been reached, switch to non-filtering mode, i.e. make & write the
2597 * header, flush the iob and buf, and get out of the way.
2599 if (add_to_iob(csp, buf, len))
2604 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2606 hdr = list_to_text(csp->headers);
2610 * Memory is too tight to even generate the header.
2611 * Send our static "Out-of-memory" page.
2613 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2614 rsp = cgi_error_memory();
2615 send_crunch_response(csp, rsp);
2619 hdrlen = strlen(hdr);
2621 if (write_socket(csp->cfd, hdr, hdrlen)
2622 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
2623 || (write_socket(csp->cfd, buf, (size_t)len)))
2625 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2632 * Reset the byte_count to the amount of bytes
2633 * we just flushed. len will be added a few lines below,
2634 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2636 byte_count = (size_t)flushed;
2638 content_filter = NULL;
2644 if (write_socket(csp->cfd, buf, (size_t)len))
2646 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2650 byte_count += (size_t)len;
2655 /* we're still looking for the end of the
2656 * server's header ... (does that make header
2657 * parsing an "out of body experience" ?
2661 * buffer up the data we just read. If that fails,
2662 * there's little we can do but send our static
2663 * out-of-memory page.
2665 if (add_to_iob(csp, buf, len))
2667 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2668 rsp = cgi_error_memory();
2669 send_crunch_response(csp, rsp);
2674 /* Convert iob into something sed() can digest */
2675 if (JB_ERR_PARSE == get_server_headers(csp))
2679 /* Well, we tried our MS IIS/5
2680 * hack and it didn't work.
2681 * The header is incomplete
2682 * and there isn't anything
2683 * we can do about it.
2685 log_error(LOG_LEVEL_INFO,
2686 "MS IIS5 hack didn't produce valid headers.");
2691 /* Since we have to wait for
2692 * more from the server before
2693 * we can parse the headers
2694 * we just continue here.
2700 /* Did we actually get anything? */
2701 if (NULL == csp->headers->first)
2703 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2704 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2705 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2706 free_http_request(http);
2710 assert(csp->headers->first->str);
2712 if (strncmpic(csp->headers->first->str, "HTTP", 4))
2715 * It doesn't look like a HTTP response:
2716 * tell the client and log the problem.
2718 if (strlen(csp->headers->first->str) > 30)
2720 csp->headers->first->str[30] = '\0';
2722 log_error(LOG_LEVEL_ERROR,
2723 "Invalid server or forwarder response. Starts with: %s",
2724 csp->headers->first->str);
2725 log_error(LOG_LEVEL_CLF,
2726 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2727 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2728 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2729 free_http_request(http);
2733 /* we have now received the entire header.
2734 * filter it and send the result to the client
2736 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2738 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2740 hdr = list_to_text(csp->headers);
2743 /* FIXME Should handle error properly */
2744 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2747 if (crunch_response_triggered(csp, crunchers_light))
2750 * One of the tags created by a server-header
2751 * tagger triggered a crunch. We already
2752 * delivered the crunch response to the client
2753 * and are done here after cleaning up.
2758 /* Buffer and pcrs filter this if appropriate. */
2760 if (!http->ssl) /* We talk plaintext */
2762 content_filter = get_filter_function(csp);
2765 * Only write if we're not buffering for content modification
2767 if (!content_filter)
2769 /* write the server's (modified) header to
2770 * the client (along with anything else that
2771 * may be in the buffer)
2774 if (write_socket(csp->cfd, hdr, strlen(hdr))
2775 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
2777 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2779 /* the write failed, so don't bother
2780 * mentioning it to the client...
2781 * it probably can't hear us anyway.
2787 byte_count += (size_t)len;
2790 /* we're finished with the server's header */
2795 /* If this was a MS IIS/5 hack then it means
2796 * the server has already closed the
2797 * connection. Nothing more to read. Time
2802 log_error(LOG_LEVEL_INFO,
2803 "Closed server connection detected with MS IIS5 hack enabled.");
2810 return; /* huh? we should never get here */
2813 if (csp->content_length == 0)
2816 * If Privoxy didn't recalculate the
2817 * Content-Lenght, byte_count is still
2820 csp->content_length = byte_count;
2823 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2824 csp->ip_addr_str, http->ocmd, csp->content_length);
2828 /*********************************************************************
2832 * Description : This is little more than chat. We only "serve" to
2833 * to close any socket that chat may have opened.
2836 * 1 : csp = Current client state (buffers, headers, etc...)
2840 *********************************************************************/
2842 void serve(struct client_state *csp)
2843 #else /* ifndef AMIGA */
2844 static void serve(struct client_state *csp)
2845 #endif /* def AMIGA */
2848 close_socket(csp->cfd);
2850 if (csp->sfd != JB_INVALID_SOCKET)
2852 close_socket(csp->sfd);
2855 csp->flags &= ~CSP_FLAG_ACTIVE;
2861 /*********************************************************************
2863 * Function : server_thread
2865 * Description : We only exist to call `serve' in a threaded environment.
2868 * 1 : data = Current client state (buffers, headers, etc...)
2870 * Returns : Always 0.
2872 *********************************************************************/
2873 static int32 server_thread(void *data)
2875 serve((struct client_state *) data);
2882 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2883 /*********************************************************************
2887 * Description : Print usage info & exit.
2889 * Parameters : Pointer to argv[0] for identifying ourselves
2893 *********************************************************************/
2894 static void usage(const char *myname)
2896 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2900 #endif /* defined(unix) */
2903 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2904 #endif /* defined(unix) */
2905 "[--version] [configfile]\n"
2906 "Aborting\n", myname);
2911 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2914 /*********************************************************************
2916 * Function : initialize_mutexes
2918 * Description : Prepares mutexes if mutex support is available.
2922 * Returns : Void, exits in case of errors.
2924 *********************************************************************/
2925 static void initialize_mutexes(void)
2929 #ifdef FEATURE_PTHREAD
2931 * Prepare global mutex semaphores
2933 err = pthread_mutex_init(&log_mutex, 0);
2935 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2938 * XXX: The assumptions below are a bit naive
2939 * and can cause locks that aren't necessary.
2941 * For example older FreeBSD versions (< 6.x?)
2942 * have no gethostbyname_r, but gethostbyname is
2945 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2946 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2947 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2949 * XXX: should we use a single mutex for
2950 * localtime() and gmtime() as well?
2952 #ifndef HAVE_GMTIME_R
2953 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2954 #endif /* ndef HAVE_GMTIME_R */
2956 #ifndef HAVE_LOCALTIME_R
2957 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2958 #endif /* ndef HAVE_GMTIME_R */
2961 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2962 #endif /* ndef HAVE_RANDOM */
2963 #endif /* FEATURE_PTHREAD */
2966 * TODO: mutex support for mingw32 would be swell.
2971 printf("Fatal error. Mutex initialization failed: %s.\n",
2980 /*********************************************************************
2984 * Description : Load the config file and start the listen loop.
2985 * This function is a lot more *sane* with the `load_config'
2986 * and `listen_loop' functions; although it stills does
2987 * a *little* too much for my taste.
2990 * 1 : argc = Number of parameters (including $0).
2991 * 2 : argv = Array of (char *)'s to the parameters.
2993 * Returns : 1 if : can't open config file, unrecognized directive,
2994 * stats requested in multi-thread mode, can't open the
2995 * log file, can't open the jar file, listen port is invalid,
2996 * any load fails, and can't bind port.
2998 * Else main never returns, the process must be signaled
2999 * to terminate execution. Or, on Windows, use the
3000 * "File", "Exit" menu option.
3002 *********************************************************************/
3004 int real_main(int argc, const char *argv[])
3006 int main(int argc, const char *argv[])
3010 unsigned int random_seed;
3012 struct passwd *pw = NULL;
3013 struct group *grp = NULL;
3016 char *pre_chroot_nslookup_to_load_resolver = NULL;
3023 #if !defined(_WIN32)
3031 * Parse the command line arguments
3033 * XXX: simply printing usage information in case of
3034 * invalid arguments isn't particularly user friendly.
3036 while (++argc_pos < argc)
3039 /* Check to see if the service must be installed or uninstalled */
3040 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3042 const char *pName = argv[argc_pos] + 9;
3045 exit( (install_service(pName)) ? 0 : 1 );
3047 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3049 const char *pName = argv[argc_pos] + 11;
3052 exit((uninstall_service(pName)) ? 0 : 1);
3054 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3056 bRunAsService = TRUE;
3057 w32_set_service_cwd();
3058 atexit(w32_service_exit_notify);
3061 #endif /* defined(_WIN32) */
3064 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3066 if (strcmp(argv[argc_pos], "--help") == 0)
3071 else if(strcmp(argv[argc_pos], "--version") == 0)
3073 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3079 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3084 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3086 if (++argc_pos == argc) usage(argv[0]);
3087 pidfile = strdup(argv[argc_pos]);
3090 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3092 if (++argc_pos == argc) usage(argv[argc_pos]);
3094 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3097 if (NULL == (grp = getgrnam(p)))
3099 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3103 if (NULL == (pw = getpwnam(argv[argc_pos])))
3105 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3108 if (p != NULL) *--p = '\0';
3111 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3113 if (++argc_pos == argc) usage(argv[0]);
3114 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3117 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3121 #endif /* defined(unix) */
3123 else if (argc_pos + 1 != argc)
3126 * This is neither the last command line
3127 * option, nor was it recognized before,
3128 * therefore it must be invalid.
3134 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3136 configfile = argv[argc_pos];
3139 } /* -END- while (more arguments) */
3142 if ( *configfile != '/' )
3144 char cwd[BUFFER_SIZE];
3146 size_t abs_file_size;
3148 /* make config-filename absolute here */
3149 if (NULL == getcwd(cwd, sizeof(cwd)))
3151 perror("failed to get current working directory");
3156 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3157 basedir = strdup(cwd);
3159 if (NULL == basedir ||
3160 NULL == (abs_file = malloc(abs_file_size)))
3162 perror("malloc failed");
3165 strlcpy(abs_file, basedir, abs_file_size);
3166 strlcat(abs_file, "/", abs_file_size );
3167 strlcat(abs_file, configfile, abs_file_size);
3168 configfile = abs_file;
3170 #endif /* defined unix */
3174 clients->next = NULL;
3176 /* XXX: factor out initialising after the next stable release. */
3179 #elif defined(_WIN32)
3183 /* Prepare mutexes if supported and necessary. */
3184 initialize_mutexes();
3186 /* Enable logging until further notice. */
3187 init_log_module(Argv[0]);
3189 random_seed = (unsigned int)time(NULL);
3191 srandom(random_seed);
3192 #elif defined (_WIN32)
3194 * See pick_from_range() in miscutil.c for details.
3196 log_error(LOG_LEVEL_INFO,
3197 "No thread-safe PRNG implemented for your platform. "
3198 "Using weak \'randomization\' factor which will "
3199 "limit the already questionable usefulness of "
3200 "header-time-randomizing actions (disabled by default).");
3203 #endif /* ifdef HAVE_RANDOM */
3206 * Unix signal handling
3208 * Catch the abort, interrupt and terminate signals for a graceful exit
3209 * Catch the hangup signal so the errlog can be reopened.
3210 * Ignore the broken pipe signals (FIXME: Why?)
3212 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3215 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3216 const int ignored_signals[] = { SIGPIPE, 0 };
3218 for (idx = 0; catched_signals[idx] != 0; idx++)
3220 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3221 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3223 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3224 #endif /* ifdef sun */
3226 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3230 for (idx = 0; ignored_signals[idx] != 0; idx++)
3232 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3234 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3239 #else /* ifdef _WIN32 */
3240 # ifdef _WIN_CONSOLE
3242 * We *are* in a windows console app.
3243 * Print a verbose messages about FAQ's and such
3245 printf("%s", win32_blurb);
3246 # endif /* def _WIN_CONSOLE */
3247 #endif /* def _WIN32 */
3250 /* Initialize the CGI subsystem */
3251 cgi_init_error_messages();
3254 * If runnig on unix and without the --nodaemon
3255 * option, become a daemon. I.e. fork, detach
3256 * from tty and get process group leadership
3269 if ( pid < 0 ) /* error */
3274 else if ( pid != 0 ) /* parent */
3279 * must check for errors
3280 * child died due to missing files aso
3283 wpid = waitpid( pid, &status, WNOHANG );
3292 /* Should be more portable, but not as well tested */
3297 #else /* ndef __FreeBSD__ */
3299 #endif /* ndef __FreeBSD__ */
3300 fd = open("/dev/tty", O_RDONLY);
3303 /* no error check here */
3304 ioctl( fd, TIOCNOTTY,0 );
3309 * stderr (fd 2) will be closed later on, when the
3310 * log file has been parsed.
3317 } /* -END- if (!no_daemon) */
3320 * As soon as we have written the PID file, we can switch
3321 * to the user and group ID indicated by the --user option
3327 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3329 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3335 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3337 /* Read the time zone file from /etc before doing chroot. */
3339 if (NULL != pre_chroot_nslookup_to_load_resolver
3340 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3342 /* Initialize resolver library. */
3343 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3345 if (chroot(pw->pw_dir) < 0)
3347 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3351 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3354 if (setuid(pw->pw_uid))
3356 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3360 char putenv_dummy[64];
3362 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3363 if (putenv(putenv_dummy) != 0)
3365 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3368 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3369 if (putenv(putenv_dummy) != 0)
3371 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3377 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3380 #endif /* defined unix */
3383 /* This will be FALSE unless the command line specified --service
3387 /* Yup, so now we must attempt to establish a connection
3388 * with the service dispatcher. This will only work if this
3389 * process was launched by the service control manager to
3390 * actually run as a service. If this isn't the case, i've
3391 * known it take around 30 seconds or so for the call to return.
3394 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3395 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3397 /* Service has run, and at this point is now being stopped, so just return */
3402 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3404 /* An error occurred. Usually it's because --service was wrongly specified
3405 * and we were unable to connect to the Service Control Dispatcher because
3406 * it wasn't expecting us and is therefore not listening.
3408 * For now, just continue below to call the listen_loop function.
3411 #endif /* def _WIN32 */
3421 /*********************************************************************
3423 * Function : bind_port_helper
3425 * Description : Bind the listen port. Handles logging, and aborts
3429 * 1 : config = Privoxy configuration. Specifies port
3432 * Returns : Port that was opened.
3434 *********************************************************************/
3435 static jb_socket bind_port_helper(struct configuration_spec * config)
3440 if (config->haddr == NULL)
3442 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3447 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3448 config->hport, config->haddr);
3451 result = bind_port(config->haddr, config->hport, &bfd);
3458 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3459 "There may be another Privoxy or some other "
3460 "proxy running on port %d",
3461 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3462 config->hport, config->hport);
3465 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3466 "The hostname is not resolvable",
3467 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3470 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3471 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3474 /* shouldn't get here */
3475 return JB_INVALID_SOCKET;
3478 config->need_bind = 0;
3485 /* Without this simple workaround we get this compiler warning from _beginthread
3486 * warning C4028: formal parameter 1 different from declaration
3488 void w32_service_listen_loop(void *p)
3492 #endif /* def _WIN32 */
3495 /*********************************************************************
3497 * Function : listen_loop
3499 * Description : bind the listen port and enter a "FOREVER" listening loop.
3505 *********************************************************************/
3506 static void listen_loop(void)
3508 struct client_state *csp = NULL;
3510 struct configuration_spec * config;
3512 config = load_config();
3514 bfd = bind_port_helper(config);
3516 #ifdef FEATURE_GRACEFUL_TERMINATION
3517 while (!g_terminate)
3522 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3523 while (waitpid(-1, NULL, WNOHANG) > 0)
3525 /* zombie children */
3527 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3530 * Free data that was used by died threads
3536 * Re-open the errlog after HUP signal
3538 if (received_hup_signal)
3540 init_error_log(Argv[0], config->logfile);
3541 received_hup_signal = 0;
3546 #ifdef FEATURE_COOKIE_JAR
3548 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3549 * already open. I think unload_configfile() is not being run, which should do
3550 * this work. Until that can get resolved, we'll use this workaround.
3554 if (csp->config->jar)
3556 fclose(csp->config->jar);
3557 csp->config->jar = NULL;
3559 #endif /* FEATURE_COOKIE_JAR */
3560 #endif /* __OS2__ */
3562 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3564 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3568 csp->flags |= CSP_FLAG_ACTIVE;
3569 csp->sfd = JB_INVALID_SOCKET;
3571 csp->config = config = load_config();
3573 if ( config->need_bind )
3576 * Since we were listening to the "old port", we will not see
3577 * a "listen" param change until the next IJB request. So, at
3578 * least 1 more request must be made for us to find the new
3579 * setting. I am simply closing the old socket and binding the
3582 * Which-ever is correct, we will serve 1 more page via the
3583 * old settings. This should probably be a "show-proxy-args"
3584 * request. This should not be a so common of an operation
3585 * that this will hurt people's feelings.
3590 bfd = bind_port_helper(config);
3593 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3595 if (!accept_connection(csp, bfd))
3597 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3610 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3613 #ifdef FEATURE_TOGGLE
3614 if (global_toggle_state)
3615 #endif /* def FEATURE_TOGGLE */
3617 csp->flags |= CSP_FLAG_TOGGLED_ON;
3620 if (run_loader(csp))
3622 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3623 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3627 if (block_acl(NULL,csp))
3629 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3630 close_socket(csp->cfd);
3634 #endif /* def FEATURE_ACL */
3636 /* add it to the list of clients */
3637 csp->next = clients->next;
3638 clients->next = csp;
3640 if (config->multi_threaded)
3644 /* this is a switch () statment in the C preprocessor - ugh */
3645 #undef SELECTED_ONE_OPTION
3647 /* Use Pthreads in preference to native code */
3648 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3649 #define SELECTED_ONE_OPTION
3651 pthread_t the_thread;
3652 pthread_attr_t attrs;
3654 pthread_attr_init(&attrs);
3655 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3656 errno = pthread_create(&the_thread, &attrs,
3657 (void * (*)(void *))serve, csp);
3658 child_id = errno ? -1 : 0;
3659 pthread_attr_destroy(&attrs);
3663 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3664 #define SELECTED_ONE_OPTION
3665 child_id = _beginthread(
3666 (void (*)(void *))serve,
3671 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3672 #define SELECTED_ONE_OPTION
3673 child_id = _beginthread(
3674 (void(* _Optlink)(void*))serve,
3680 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3681 #define SELECTED_ONE_OPTION
3683 thread_id tid = spawn_thread
3684 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3686 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3688 child_id = (int) tid;
3697 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3698 #define SELECTED_ONE_OPTION
3699 csp->cfd = ReleaseSocket(csp->cfd, -1);
3702 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3703 NP_Output, Output(),
3704 NP_CloseOutput, FALSE,
3705 NP_Name, (ULONG)"privoxy child",
3709 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3710 NP_Output, Output(),
3711 NP_CloseOutput, FALSE,
3712 NP_Name, (ULONG)"privoxy child",
3713 NP_StackSize, 200*1024,
3719 ((struct Task *)child_id)->tc_UserData = csp;
3720 Signal((struct Task *)child_id, SIGF_SINGLE);
3725 #if !defined(SELECTED_ONE_OPTION)
3728 /* This block is only needed when using fork().
3729 * When using threads, the server thread was
3730 * created and run by the call to _beginthread().
3732 if (child_id == 0) /* child */
3735 #ifdef FEATURE_TOGGLE
3736 int inherited_toggle_state = global_toggle_state;
3737 #endif /* def FEATURE_TOGGLE */
3742 * If we've been toggled or we've blocked the request, tell Mom
3745 #ifdef FEATURE_TOGGLE
3746 if (inherited_toggle_state != global_toggle_state)
3748 rc |= RC_FLAG_TOGGLED;
3750 #endif /* def FEATURE_TOGGLE */
3752 #ifdef FEATURE_STATISTICS
3753 if (csp->flags & CSP_FLAG_REJECTED)
3755 rc |= RC_FLAG_BLOCKED;
3757 #endif /* ndef FEATURE_STATISTICS */
3761 else if (child_id > 0) /* parent */
3763 /* in a fork()'d environment, the parent's
3764 * copy of the client socket and the CSP
3768 #if !defined(_WIN32) && !defined(__CYGWIN__)
3770 wait( &child_status );
3773 * Evaluate child's return code: If the child has
3774 * - been toggled, toggle ourselves
3775 * - blocked its request, bump up the stats counter
3778 #ifdef FEATURE_TOGGLE
3779 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3781 global_toggle_state = !global_toggle_state;
3783 #endif /* def FEATURE_TOGGLE */
3785 #ifdef FEATURE_STATISTICS
3787 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3791 #endif /* def FEATURE_STATISTICS */
3793 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3794 close_socket(csp->cfd);
3795 csp->flags &= ~CSP_FLAG_ACTIVE;
3799 #undef SELECTED_ONE_OPTION
3800 /* end of cpp switch () */
3802 if (child_id < 0) /* failed */
3804 char buf[BUFFER_SIZE];
3806 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3808 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3810 write_socket(csp->cfd, buf, strlen(buf));
3811 close_socket(csp->cfd);
3812 csp->flags &= ~CSP_FLAG_ACTIVE;
3823 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3825 /* Clean up. Aim: free all memory (no leaks) */
3826 #ifdef FEATURE_GRACEFUL_TERMINATION
3828 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3830 unload_current_config_file();
3831 unload_current_actions_file();
3832 unload_current_re_filterfile();
3833 #ifdef FEATURE_TRUST
3834 unload_current_trust_file();
3837 if (config->multi_threaded)
3844 } while ((clients->next != NULL) && (--i > 0));
3848 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3859 #ifdef FEATURE_COOKIE_JAR
3860 if (NULL != config->jar)
3862 fclose(config->jar);
3866 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3867 /* Cleanup - remove taskbar icon etc. */
3872 #endif /* FEATURE_GRACEFUL_TERMINATION */