1 const char jcc_rcs[] = "$Id: jcc.c,v 1.175 2008/05/09 18:53:59 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 1.175 2008/05/09 18:53:59 fabiankeil
37 * Fix comment grammar.
39 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
40 * Remove the pointless buffer in client_protocol_is_unsupported().
42 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
43 * Least-effort fix for bug #1821930 (reported by Lee):
44 * If the response doesn't look like HTTP,
45 * tell the client and log the problem.
47 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
48 * Don't pass the whole csp structure to flush_socket()
49 * when it only needs a file descriptor and a buffer.
51 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
52 * Remove kill-popups action.
54 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
55 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
57 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
58 * Remove the treat-forbidden-connects-like-blocks action. We now
59 * use the "blocked" page for forbidden CONNECT requests by default.
61 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
62 * Also use shiny new connect_port_is_forbidden() in jcc.c.
64 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
65 * Rename url_actions() to get_url_actions() and let it
66 * use the standard parameter ordering.
68 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
69 * Let forward_url() use the standard parameter ordering
70 * and mark its second parameter immutable.
72 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
73 * Remove the "Listening ... for local connections only" log message.
74 * Whether or not remote connections are able to reach Privoxy is up
75 * to the operating system.
77 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
78 * Prevent the log messages for CONNECT requests to unacceptable
79 * ports from printing the limit-connect argument as [null] if
80 * limit-connect hasn't been explicitly enabled.
82 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
83 * Make sure all console-mode apps get a usage() instance
85 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
86 * Reword NO_SERVER_DATA_RESPONSE to make it harder
87 * to misunderstand what the message is all about.
89 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
90 * Unbreak trustfile which previously didn't work without
91 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
93 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
94 * Plug memory leak. Spotted by Valgrind, triggered by
95 * Privoxy-Regression-Test feeding proxyfuzz.py.
97 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
98 * In the HTTP snipplets, refer to the client as client.
100 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
101 * Emit a log message when activating the MS IIS5 hack.
103 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
104 * Log the "weak randomization factor" warning only
105 * once for mingw32 and provide some more details.
107 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
108 * Initialize log module after initializing mutexes, future
109 * deadlocks in that code should now work cross-platform.
111 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
112 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
113 * Reported by Bert van Leeuwen in BR#1818808.
115 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
116 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
118 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
119 * When in daemon mode, close stderr after the configuration file has been
120 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
122 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
123 * - Fix a crash when parsing invalid requests whose first header
124 * is rejected by get_header(). Regression (re?)introduced
125 * in r1.143 by yours truly.
126 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
127 * client_cookie_adder() to make sure send-vanilla-wafer can be
128 * controlled through tags (and thus regression-tested).
130 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
131 * - Move get_filter_function() from jcc.c to filters.c
132 * so the filter functions can be static.
133 * - Don't bother filtering body-less responses.
135 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
136 * Execute content filters through execute_content_filter().
138 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
139 * Initialize req to NULL to make sure it's defined if the
140 * first read_socket() call fails. Reported by icmp30.
142 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
143 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
144 * extensive comments moved to user manual.
146 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
147 * Don't crash if a broken header filter wiped out the request line.
149 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
150 * Fix byte_count calculation in case of flushes
151 * and don't parse the server headers a second time.
153 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
154 * - If there's a connection problem after we already forwarded
155 * parts of the original content, just hang up. Fixes BR#1776724.
156 * - Fix warnings about unused code on mingw32.
157 * - In case of flushes, calculate the byte count
158 * less incorrectly (I think).
160 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
161 * Add some more prototypes for static functions.
163 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
164 * Comment out request_contains_null_bytes() until it's used again.
166 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
167 * #1763173 from Stefan Huehner: s@const static@static const@
168 * and declare some more functions static.
170 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
171 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
172 * and explain why they were rejected in the first place.
173 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
174 * CONNECT requests. The request line was missing.
175 * - Add two more XXX reminders as we don't have enough already.
177 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
178 * As Hal noticed, checking dispatch_cgi() as the last cruncher
179 * looks like a bug if CGI requests are blocked unintentionally,
180 * so don't do it unless the user enabled the new config option
181 * "allow-cgi-request-crunching".
183 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
184 * - Allow to rewrite the request destination behind the client's back.
185 * - Turn the weird-looking unconditional for loop that
186 * reads the client request into a conditional while loop.
187 * Move the stuff that only runs once out of the loop.
188 * - Move parts of chat(), server_content_type() and the
189 * necessary stuff to fix BR#1750917 into get_filter_function().
191 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
192 * Temporary workaround for BR#1730105.
194 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
195 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
196 * deadlocks and crashes on OpenBSD and possibly other OS with neither
197 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
198 * Thanks to Ralf Horstmann for report and solution.
200 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
201 * Add forward-override{} to change the forwarding settings through
202 * action sections. This is mainly interesting to forward different
203 * clients differently (for example based on User-Agent or request
206 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
207 * - Let usage() mention the --chroot parameter.
208 * - Use read_socket() consistently and always leave
209 * the last buffer byte alone, even in cases where
210 * null termination (currently) doesn't matter.
212 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
213 * - Fix config file loading on Unix if no config file is specified.
214 * Since r1.97 Privoxy would always interpret the last argument as
215 * config file, even if it's a valid command line option.
216 * - Abort in case of unrecognized command line options. Closes #1719696.
217 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
218 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
220 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
221 * - Don't rerun crunchers that only depend on the request URL.
222 * - Don't count redirects and CGI requests as "blocked requests".
224 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
225 * Support crunching based on tags created by server-header taggers.
227 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
228 * Make HTTP snippets static (again). Add a Content-Type for those
229 * with content so the browser doesn't guess it based on the URL.
231 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
232 * Move crunching and request line rebuilding out of chat().
234 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
235 * Introduce tags as alternative way to specify which
236 * actions apply to a request. At the moment tags can be
237 * created based on client and server headers.
239 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
240 * Don't CLF-log CONNECT requests twice.
242 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
243 * Log the source address for ACL-related connection drops.
245 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
246 * New config option: enforce-blocks.
248 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
249 * - Move null byte check into separate function.
250 * - Don't confuse the client with error pages
251 * if a CONNECT request was already confirmed.
253 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
254 * Speed up NULL byte escaping and only log the complete
255 * NULL byte requests with header debugging enabled.
257 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
258 * Answer requests that contain NULL bytes with
259 * a custom response instead of waiting for more
260 * data until the client eventually hangs up.
262 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
263 * - Move delivery and logging of crunched responses
264 * from chat() into send_crunch_response().
265 * - Display the reason for generating http_responses.
266 * - Log the content length for LOG_LEVEL_CLF correctly
267 * (still incorrect for some fixed responses).
268 * - Reword an incorrect comment about
269 * treat-forbidden-connects-like-blocks violating
271 * - Add some log messages.
273 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
274 * Move mutex initialization into separate
275 * function and exit in case of errors.
277 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
278 * - Start to reduce chat()'s line count and move
279 * parts of it into separate functions.
280 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
282 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
283 * - Add Proxy-Agent header to HTTP snippets that are
284 * supposed to reach HTTP clients only.
285 * - Made a few CONNECT log messages more descriptive.
286 * - Catch completely empty server responses (as seen
287 * with Tor's fake ".noconnect" top level domain).
288 * - Use shiny new "forwarding-failed" template for socks errors.
290 * Revision 1.118 2007/01/07 07:43:43 joergs
291 * AmigaOS4 support added.
293 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
294 * Added config option accept-intercepted-requests
295 * and disabled it by default.
297 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
298 * Reverted parts of my last commit
299 * to keep error handling working.
301 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
302 * Fixed gcc43 conversion warnings.
304 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
305 * Fix -pedantic ISO C warning about converting
306 * from function pointer to object pointer.
308 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
309 * Silence compiler warning I introduced with my last commit.
311 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
312 * Mutex protect rand() if POSIX threading
313 * is used, warn the user if that's not possible
314 * and stop using it on _WIN32 where it could
317 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
318 * Don't prevent core dumps by catching SIGABRT.
319 * It's rude and makes debugging unreasonable painful.
321 * Revision 1.110 2006/12/13 14:52:53 etresoft
322 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
324 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
325 * Privoxy is now able to run as intercepting
326 * proxy in combination with any packet filter
327 * that does the port redirection. The destination
328 * is extracted from the "Host:" header which
329 * should be available for nearly all requests.
331 * Moved HTTP snipplets into jcc.c.
332 * Added error message for gopher proxy requests.
334 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
335 * Only unlink the pidfile if it's actually used.
337 * Change order of interception checks to make
338 * it possible to block or redirect requests for
341 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
342 * Make pthread mutex locking more generic. Instead of
343 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
344 * and use mutex locking unless there is an _r function
345 * available. Better safe than sorry.
347 * Fixes "./configure --disable-pthread" and should result
348 * in less threading-related problems on pthread-using platforms,
349 * but it still doesn't fix BR#1122404.
351 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
352 * Move pthread.h inclusion from jcc.c to jcc.h.
353 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
355 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
356 * Don't exit after receiving the second SIGHUP on Solaris.
358 * Fixes BR 1052235, but the same problem may exist on other
359 * systems. Once 3.0.6 is out we should use sigset()
360 * where available and see if it breaks anything.
362 * Revision 1.104 2006/09/23 13:26:38 roro
363 * Replace TABs by spaces in source code.
365 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
366 * Fix +redirect{}. Didn't work with -fast-redirects.
368 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
369 * Respond with 400 and a short text message
370 * if the client tries to use Privoxy as FTP proxy.
372 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
373 * Make number of retries in case of forwarded-connect problems
374 * a config file option (forwarded-connect-retries) and use 0 as
377 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
378 * Set random(3) seed.
380 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
381 * Follow the OpenBSD port's lead and protect the resolve
382 * functions on OpenBSD as well.
384 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
385 * --user fix. Only use the user as group if no group is specified.
386 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
388 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
389 * Windows service (re-)integration
393 * --install[:service_name]
394 * --uninstall[:service_name]
397 * They work as follows:
398 * --install will create a service for you and then terminate.
399 * By default the service name will be "privoxy" (without the quotes).
400 * However you can run multiple services if you wish, just by adding
401 * a colon and then a name (no spaces).
403 * --uninstall follows the exact same rules a --install.
405 * --service is used when the program is executed by the service
406 * control manager, and in normal circumstances would never be
407 * used as a command line argument.
409 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
410 * Windows service integration
412 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
413 * Incorporate Fabian Keil's patch work:
414 http://www.fabiankeil.de/sourcecode/privoxy/
416 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
417 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
418 * with what was really the latest development (the v_3_0_branch branch)
420 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
421 * Thanks to Jindrich Makovicka for a race condition fix for the log
422 * file. The race condition remains for non-pthread implementations.
423 * Reference patch #1175720.
425 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
426 * Add the ability to check jpeg images for invalid
427 * lengths of comment blocks. Defensive strategy
428 * against the exploit:
429 * Microsoft Security Bulletin MS04-028
430 * Buffer Overrun in JPEG Processing (GDI+) Could
431 * Allow Code Execution (833987)
432 * Enabled with +inspect-jpegs in actions files.
434 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
435 * - Fixed usage info for non-unix platforms
436 * - Fixed small cmdline parsing bug
438 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
439 * Diagnostics: Now preserve the returncode of pthread_create
440 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
442 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
443 * No longer ignore SIGCHLD. Fixes bug #769381
445 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
446 * Close jarfile on graceful exit, remove stray line
448 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
449 * Cosmetics: Killed a warning, a typo and an allocation left at exit
451 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
452 * No longer rely on non-POSIX.1 extensions of getcwd().
455 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
456 * Replaced setenv() by posix-compliant putenv()
457 * Thanks to Neil McCalden (nmcc AT users.sf.net).
459 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
460 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
462 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
463 * Clean-up and extension of improvements for forked mode:
464 * - Child's return code now consists of flags RC_FLAG_*
465 * - Reporting toggle to parent now properly #ifdef'ed
466 * - Children now report blocking to parent. This enables
467 * statistics in forked mode
469 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
470 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
471 * Children now report having been toggled through _exit(17), parents
472 * watch for that code and toggle themselves if found.
474 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
475 * Wrapping all *_r functions (the non-_r versions of them) with
476 * mutex semaphores for OSX. Hopefully this will take care of all
477 * of those pesky crash reports.
479 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
480 * Fixed two mostly harmless mem leaks
482 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
483 * Fix: Head of global clients list now initialized to NULL
485 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
486 * Added basic support for OPTIONS and TRACE HTTP methods:
487 * - New interceptor direct_response() added in chat().
488 * - sed() moved to earlier in the process, so that the
489 * Host: header is evaluated before actions and forwarding
492 * Revision 1.92 2002/05/08 16:00:46 oes
493 * Chat's buffer handling:
494 * - Fixed bug with unchecked out-of-mem conditions
495 * while reading client request & server headers
496 * - No longer predict if the buffer limit will be exceeded
497 * in the next read -- check add_to_iob's new
498 * return code. If buffer couldn't be extended
499 * (policy or out-of-mem) while
500 * - reading from client: abort
501 * - reading server headers: send error page
502 * - buffering server body for filter: flush,
503 * and if that fails: send error page
505 * Revision 1.91 2002/04/08 20:35:58 swa
508 * Revision 1.90 2002/04/02 14:57:28 oes
509 * Made sending wafers independent of FEATURE_COOKIE_JAR
511 * Revision 1.89 2002/03/31 17:18:59 jongfoster
512 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
514 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
515 * More compiler warning message maintenance
517 * Revision 1.87 2002/03/26 22:29:54 swa
518 * we have a new homepage!
520 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
521 * Workaround for closing the jarfile before load_config() comes around again
523 * Revision 1.85 2002/03/24 15:23:33 jongfoster
526 * Revision 1.84 2002/03/24 13:25:43 swa
527 * name change related issues
529 * Revision 1.83 2002/03/16 23:54:06 jongfoster
530 * Adding graceful termination feature, to help look for memory leaks.
531 * If you enable this (which, by design, has to be done by hand
532 * editing config.h) and then go to http://i.j.b/die, then the program
533 * will exit cleanly after the *next* request. It should free all the
534 * memory that was used.
536 * Revision 1.82 2002/03/13 00:27:05 jongfoster
539 * Revision 1.81 2002/03/12 01:42:50 oes
540 * Introduced modular filters
542 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
543 * OS/2 port maintenance:
544 * - Fixed EMX build - it had decayed a little
545 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
546 * substituted a memset for now.
548 * Revision 1.79 2002/03/09 20:03:52 jongfoster
549 * - Making various functions return int rather than size_t.
550 * (Undoing a recent change). Since size_t is unsigned on
551 * Windows, functions like read_socket that return -1 on
552 * error cannot return a size_t.
554 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
555 * crashes, and also frequently caused JB to jump to 100%
556 * CPU and stay there. (Because it thought it had just
557 * read ((unsigned)-1) == 4Gb of data...)
559 * - The signature of write_socket has changed, it now simply
560 * returns success=0/failure=nonzero.
562 * - Trying to get rid of a few warnings --with-debug on
563 * Windows, I've introduced a new type "jb_socket". This is
564 * used for the socket file descriptors. On Windows, this
565 * is SOCKET (a typedef for unsigned). Everywhere else, it's
566 * an int. The error value can't be -1 any more, so it's
567 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
568 * Windows it maps to the #define INVALID_SOCKET.)
570 * - The signature of bind_port has changed.
572 * Revision 1.78 2002/03/08 21:35:04 oes
573 * Added optional group supplement to --user option. Will now use default group of user if no group given
575 * Revision 1.77 2002/03/07 03:52:06 oes
576 * - Fixed compiler warnings etc
577 * - Improved handling of failed DNS lookups
579 * Revision 1.76 2002/03/06 22:54:35 jongfoster
580 * Automated function-comment nitpicking.
582 * Revision 1.75 2002/03/06 10:02:19 oes
583 * Fixed stupid bug when --user was not given
585 * Revision 1.74 2002/03/06 00:49:31 jongfoster
586 * Fixing warning on Windows
587 * Making #ifdefs that refer to the same variable consistently
588 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
590 * Revision 1.73 2002/03/05 23:57:30 hal9
591 * Stray character 's' on line 1618 was breaking build.
593 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
594 * - Re-enable OS/2 building after new parms were added
595 * - Fix false out of memory report when resolving CGI templates when no IP
596 * address is available of failed attempt (a la no such domain)
598 * Revision 1.71 2002/03/05 18:13:56 oes
599 * Added --user option
601 * Revision 1.70 2002/03/05 04:52:42 oes
602 * Deleted non-errlog debugging code
604 * Revision 1.69 2002/03/04 23:50:00 jongfoster
605 * Splitting off bind_port() call into bind_port_helper(), with
608 * Revision 1.68 2002/03/04 20:17:32 oes
611 * Revision 1.67 2002/03/04 18:18:57 oes
612 * - Removed _DEBUG mode
613 * - Cleand up cmdline parsing
614 * - Introduced --no-daemon, --pidfile options
615 * - Cleaned up signal handling:
616 * - Terminate cleanly on INT, TERM and ABRT
617 * - Schedule logfile for re-opening on HUP
618 * - Ignore CHLD and PIPE
619 * - Leave the rest with their default handlers
620 * - Uniform handler registration
621 * - Added usage() function
622 * - Played styleguide police
624 * Revision 1.66 2002/03/03 15:06:55 oes
625 * Re-enabled automatic config reloading
627 * Revision 1.65 2002/03/03 14:49:11 oes
628 * Fixed CLF logging: Now uses client's original HTTP request
630 * Revision 1.64 2002/03/03 09:18:03 joergs
631 * Made jumbjuster work on AmigaOS again.
633 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
634 * Clean up a little CRLF unpleasantness that suddenly appeared
636 * Revision 1.62 2002/02/20 23:17:23 jongfoster
637 * Detecting some out-of memory conditions and exiting with a log message.
639 * Revision 1.61 2002/01/17 21:01:52 jongfoster
640 * Moving all our URL and URL pattern parsing code to urlmatch.c.
642 * Revision 1.60 2001/12/30 14:07:32 steudten
643 * - Add signal handling (unix)
644 * - Add SIGHUP handler (unix)
645 * - Add creation of pidfile (unix)
646 * - Add action 'top' in rc file (RH)
647 * - Add entry 'SIGNALS' to manpage
648 * - Add exit message to logfile (unix)
650 * Revision 1.59 2001/12/13 14:07:18 oes
651 * Fixed Bug: 503 error page now sent OK
653 * Revision 1.58 2001/11/30 23:37:24 jongfoster
654 * Renaming the Win32 config file to config.txt - this is almost the
655 * same as the corresponding UNIX name "config"
657 * Revision 1.57 2001/11/16 00:47:43 jongfoster
658 * Changing the tty-disconnection code to use setsid().
660 * Revision 1.56 2001/11/13 20:20:54 jongfoster
661 * Tabs->spaces, fixing a bug with missing {} around an if()
663 * Revision 1.55 2001/11/13 20:14:53 jongfoster
664 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
666 * Revision 1.54 2001/11/07 00:03:14 steudten
667 * Give reliable return value if an error
668 * occurs not just 0 with new daemon mode.
670 * Revision 1.53 2001/11/05 21:41:43 steudten
671 * Add changes to be a real daemon just for unix os.
672 * (change cwd to /, detach from controlling tty, set
673 * process group and session leader to the own process.
675 * Add some fatal-error log message for failed malloc().
676 * Add '-d' if compiled with 'configure --with-debug' to
677 * enable debug output.
679 * Revision 1.52 2001/10/26 20:11:20 jongfoster
680 * Fixing type mismatch
682 * Revision 1.51 2001/10/26 17:38:28 oes
685 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
686 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
687 * threads to call select() simultaneously. So, it's time to do a real, live,
688 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
689 * (native). Both versions will work, but using __OS2__ offers multi-threading.
691 * Revision 1.49 2001/10/23 21:41:35 jongfoster
692 * Added call to initialize the (statically-allocated of course)
693 * "out of memory" CGI response.
695 * Revision 1.48 2001/10/10 19:56:46 jongfoster
696 * Moving some code that wasn't cookie-related out of an #ifdef
699 * Revision 1.47 2001/10/10 16:44:36 oes
700 * Added CONNECT destination port limitation check
702 * Revision 1.46 2001/10/08 15:17:41 oes
703 * Re-enabled SSL forwarding
705 * Revision 1.45 2001/10/07 15:42:11 oes
706 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
708 * Moved downgrading of the HTTP version from parse_http_request to
709 * chat(), since we can't decide if it is necessary before we have
710 * determined the actions for the URL. The HTTP command is now
711 * *always* re-built so the repairs need no longer be special-cased.
713 * filter_popups now gets a csp pointer so it can raise the new
714 * CSP_FLAG_MODIFIED flag.
718 * Added configurable size limit for the IOB. If the IOB grows so
719 * large that the next read would exceed the limit, the header
720 * is generated, and the header & unfiltered buffer are flushed
721 * to the client. Chat then continues in non-buffering,
722 * non-filtering body mode.
724 * Revision 1.44 2001/10/02 18:13:57 oes
727 * Revision 1.43 2001/10/02 15:32:13 oes
728 * Moved generation of hdr
730 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
731 * Cleaning up 2 compiler warnings on OS/2.
733 * Revision 1.41 2001/09/16 17:05:14 jongfoster
734 * Removing unused #include showarg.h
736 * Revision 1.40 2001/09/16 15:41:45 jongfoster
737 * Fixing signed/unsigned comparison warning.
739 * Revision 1.39 2001/09/16 13:21:27 jongfoster
740 * Changes to use new list functions.
742 * Revision 1.38 2001/09/16 13:01:46 jongfoster
743 * Removing redundant function call that zeroed zalloc()'d memory.
745 * Revision 1.37 2001/09/10 11:12:24 oes
746 * Deleted unused variable
748 * Revision 1.36 2001/09/10 10:56:15 oes
749 * Silenced compiler warnings
751 * Revision 1.35 2001/07/31 14:44:22 oes
752 * Deleted unused size parameter from filter_popups()
754 * Revision 1.34 2001/07/30 22:08:36 jongfoster
755 * Tidying up #defines:
756 * - All feature #defines are now of the form FEATURE_xxx
757 * - Permanently turned off WIN_GUI_EDIT
758 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
760 * Revision 1.33 2001/07/29 19:32:00 jongfoster
761 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
763 * Revision 1.32 2001/07/29 18:47:05 jongfoster
764 * Adding missing #include "loadcfg.h"
766 * Revision 1.31 2001/07/29 12:17:48 oes
767 * Applied pthread fix by Paul Lieverse
769 * Revision 1.30 2001/07/25 22:57:13 jongfoster
770 * __BEOS__ no longer overrides FEATURE_PTHREAD.
771 * This is because FEATURE_PTHREAD will soon be widely used, so I
772 * want to keep it simple.
774 * Revision 1.29 2001/07/24 12:47:06 oes
775 * Applied BeOS support update by Eugenia
777 * Revision 1.28 2001/07/23 13:26:12 oes
778 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
780 * Revision 1.27 2001/07/19 19:09:47 haroon
781 * - Added code to take care of the situation where while processing the first
782 * server response (which includes the server header), after finding the end
783 * of the headers we were not looking past the end of the headers for
784 * content modification. I enabled it for filter_popups.
785 * Someone else should look to see if other similar operations should be
786 * done to the discarded portion of the buffer.
788 * Note 2001/07/20: No, the other content modification mechanisms will process
789 * the whole iob later anyway. --oes
791 * Revision 1.26 2001/07/18 12:31:36 oes
794 * Revision 1.25 2001/07/15 19:43:49 jongfoster
795 * Supports POSIX threads.
796 * Also removed some unused #includes.
798 * Revision 1.24 2001/07/13 14:00:40 oes
799 * - Generic content modification scheme:
800 * Each feature has its own applicability flag that is set
801 * from csp->action->flags.
802 * Replaced the "filtering" int flag , by a function pointer
803 * "content_filter" to the function that will do the content
804 * modification. If it is != NULL, the document will be buffered
805 * and processed through *content_filter, which must set
806 * csp->content_length and return a modified copy of the body
807 * or return NULL (on failiure).
808 * - Changed csp->is_text to the more generic bitmap csp->content_type
809 * which can currently take the valued CT_TEXT or CT_GIF
811 * - Removed all #ifdef PCRS
813 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
814 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
815 * the `block_acl' call. This prevents a compilation error when the user
816 * does not wish to use the "ACL" feature.
818 * Revision 1.22 2001/06/29 21:45:41 oes
819 * Indentation, CRLF->LF, Tab-> Space
821 * Revision 1.21 2001/06/29 13:29:36 oes
822 * - Cleaned up, improved comments
823 * - Unified all possible interceptors (CGI,
824 * block, trust, fast_redirect) in one
825 * place, with one (CGI) answer generation
826 * mechansim. Much clearer now.
827 * - Removed the GIF image generation, which
828 * is now done in filters.c:block_url()
829 * - Made error conditions like domain lookup
830 * failiure or (various) problems while talking
831 * to the server use cgi.c:error_response()
832 * instead of generating HTML/HTTP in chat() (yuck!)
833 * - Removed logentry from cancelled commit
835 * Revision 1.20 2001/06/09 10:55:28 jongfoster
836 * Changing BUFSIZ ==> BUFFER_SIZE
838 * Revision 1.19 2001/06/07 23:12:52 jongfoster
839 * Replacing function pointer in struct gateway with a directly
840 * called function forwarded_connect().
841 * Replacing struct gateway with struct forward_spec
843 * Revision 1.18 2001/06/03 19:12:16 oes
844 * introduced new cgi handling
846 * Revision 1.17 2001/06/01 20:07:23 jongfoster
847 * Now uses action +image-blocker{} rather than config->tinygif
849 * Revision 1.16 2001/06/01 18:49:17 jongfoster
850 * Replaced "list_share" with "list" - the tiny memory gain was not
851 * worth the extra complexity.
853 * Revision 1.15 2001/05/31 21:24:47 jongfoster
854 * Changed "permission" to "action" throughout.
855 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
856 * Moved vanilla wafer check into chat(), since we must now
857 * decide whether or not to add it based on the URL.
859 * Revision 1.14 2001/05/29 20:14:01 joergs
860 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
863 * Revision 1.13 2001/05/29 09:50:24 jongfoster
864 * Unified blocklist/imagelist/permissionslist.
865 * File format is still under discussion, but the internal changes
868 * Also modified interceptor behaviour:
869 * - We now intercept all URLs beginning with one of the following
870 * prefixes (and *only* these prefixes):
872 * * http://ijbswa.sf.net/config/
873 * * http://ijbswa.sourceforge.net/config/
874 * - New interceptors "home page" - go to http://i.j.b/ to see it.
875 * - Internal changes so that intercepted and fast redirect pages
876 * are not replaced with an image.
877 * - Interceptors now have the option to send a binary page direct
878 * to the client. (i.e. ijb-send-banner uses this)
879 * - Implemented show-url-info interceptor. (Which is why I needed
880 * the above interceptors changes - a typical URL is
881 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
882 * The previous mechanism would not have intercepted that, and
883 * if it had been intercepted then it then it would have replaced
886 * Revision 1.12 2001/05/27 22:17:04 oes
888 * - re_process_buffer no longer writes the modified buffer
889 * to the client, which was very ugly. It now returns the
890 * buffer, which it is then written by chat.
892 * - content_length now adjusts the Content-Length: header
893 * for modified documents rather than crunch()ing it.
894 * (Length info in csp->content_length, which is 0 for
895 * unmodified documents)
897 * - For this to work, sed() is called twice when filtering.
899 * Revision 1.11 2001/05/26 17:27:53 jongfoster
900 * Added support for CLF and fixed LOG_LEVEL_LOG.
901 * Also did CRLF->LF fix of my previous patch.
903 * Revision 1.10 2001/05/26 15:26:15 jongfoster
904 * ACL feature now provides more security by immediately dropping
905 * connections from untrusted hosts.
907 * Revision 1.9 2001/05/26 00:28:36 jongfoster
908 * Automatic reloading of config file.
909 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
910 * Most of the global variables have been moved to a new
911 * struct configuration_spec, accessed through csp->config->globalname
912 * Most of the globals remaining are used by the Win32 GUI.
914 * Revision 1.8 2001/05/25 22:43:18 jongfoster
915 * Fixing minor memory leak and buffer overflow.
917 * Revision 1.7 2001/05/25 22:34:30 jongfoster
920 * Revision 1.6 2001/05/23 00:13:58 joergs
921 * AmigaOS support fixed.
923 * Revision 1.5 2001/05/22 18:46:04 oes
925 * - Enabled filtering banners by size rather than URL
926 * by adding patterns that replace all standard banner
927 * sizes with the "Junkbuster" gif to the re_filterfile
929 * - Enabled filtering WebBugs by providing a pattern
930 * which kills all 1x1 images
932 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
933 * which is selected by the (nonstandard and therefore
934 * capital) letter 'U' in the option string.
935 * It causes the quantifiers to be ungreedy by default.
936 * Appending a ? turns back to greedy (!).
938 * - Added a new interceptor ijb-send-banner, which
939 * sends back the "Junkbuster" gif. Without imagelist or
940 * MSIE detection support, or if tinygif = 1, or the
941 * URL isn't recognized as an imageurl, a lame HTML
942 * explanation is sent instead.
944 * - Added new feature, which permits blocking remote
945 * script redirects and firing back a local redirect
947 * The feature is conditionally compiled, i.e. it
948 * can be disabled with --disable-fast-redirects,
949 * plus it must be activated by a "fast-redirects"
950 * line in the config file, has its own log level
951 * and of course wants to be displayed by show-proxy-args
952 * Note: Boy, all the #ifdefs in 1001 locations and
953 * all the fumbling with configure.in and acconfig.h
954 * were *way* more work than the feature itself :-(
956 * - Because a generic redirect template was needed for
957 * this, tinygif = 3 now uses the same.
959 * - Moved GIFs, and other static HTTP response templates
964 * - Removed some >400 CRs again (Jon, you really worked
967 * Revision 1.4 2001/05/21 19:34:01 jongfoster
968 * Made failure to bind() a fatal error.
970 * Revision 1.3 2001/05/20 01:21:20 jongfoster
971 * Version 2.9.4 checkin.
972 * - Merged popupfile and cookiefile, and added control over PCRS
973 * filtering, in new "permissionsfile".
974 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
975 * file error you now get a message box (in the Win32 GUI) rather
976 * than the program exiting with no explanation.
977 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
979 * - Removed tabs from "config"
980 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
981 * - Bumped up version number.
983 * Revision 1.2 2001/05/17 22:34:44 oes
984 * - Added hint on GIF char array generation to jcc.c
985 * - Cleaned CRLF's from the sources and related files
986 * - Repaired logging for REF and FRC
988 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
989 * Initial import of version 2.9.3 source tree
992 *********************************************************************/
998 #include <sys/types.h>
1007 # ifndef FEATURE_PTHREAD
1011 # include <windows.h>
1012 # include <process.h>
1013 # endif /* ndef FEATURE_PTHREAD */
1016 # ifndef _WIN_CONSOLE
1017 # include "w32log.h"
1018 # endif /* ndef _WIN_CONSOLE */
1019 # include "w32svrapi.h"
1021 #else /* ifndef _WIN32 */
1023 # if !defined (__OS2__)
1024 # include <unistd.h>
1025 # include <sys/wait.h>
1026 # endif /* ndef __OS2__ */
1027 # include <sys/time.h>
1028 # include <sys/stat.h>
1029 # include <sys/ioctl.h>
1032 #include <sys/termios.h>
1040 # include <signal.h>
1043 # include <socket.h> /* BeOS has select() for sockets only. */
1044 # include <OS.h> /* declarations for threads and stuff. */
1047 # if defined(__EMX__) || defined(__OS2__)
1048 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1053 #define bzero(B,N) memset(B,0x00,n)
1057 # include <select.h>
1062 #include "project.h"
1065 #include "filters.h"
1066 #include "loaders.h"
1067 #include "parsers.h"
1068 #include "miscutil.h"
1070 #include "jbsockets.h"
1071 #include "gateway.h"
1072 #include "actions.h"
1074 #include "loadcfg.h"
1075 #include "urlmatch.h"
1077 const char jcc_h_rcs[] = JCC_H_VERSION;
1078 const char project_h_rcs[] = PROJECT_H_VERSION;
1081 struct client_state clients[1];
1082 struct file_list files[1];
1084 #ifdef FEATURE_STATISTICS
1085 int urls_read = 0; /* total nr of urls read inc rejected */
1086 int urls_rejected = 0; /* total nr of urls rejected */
1087 #endif /* def FEATURE_STATISTICS */
1089 #ifdef FEATURE_GRACEFUL_TERMINATION
1090 int g_terminate = 0;
1093 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1094 static void sig_handler(int the_signal);
1096 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1097 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1098 static jb_err get_server_headers(struct client_state *csp);
1099 static const char *crunch_reason(const struct http_response *rsp);
1100 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
1102 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
1104 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1105 static jb_err change_request_destination(struct client_state *csp);
1106 static void chat(struct client_state *csp);
1107 static void serve(struct client_state *csp);
1108 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1109 static void usage(const char *myname);
1111 static void initialize_mutexes(void);
1112 static jb_socket bind_port_helper(struct configuration_spec *config);
1113 static void listen_loop(void);
1116 void serve(struct client_state *csp);
1117 #else /* ifndef AMIGA */
1118 static void serve(struct client_state *csp);
1119 #endif /* def AMIGA */
1122 static int32 server_thread(void *data);
1123 #endif /* def __BEOS__ */
1126 #define sleep(N) Sleep(((N) * 1000))
1130 #define sleep(N) DosSleep(((N) * 100))
1133 #ifdef FEATURE_PTHREAD
1134 pthread_mutex_t log_mutex;
1135 pthread_mutex_t log_init_mutex;
1137 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1138 pthread_mutex_t resolver_mutex;
1139 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1141 #ifndef HAVE_GMTIME_R
1142 pthread_mutex_t gmtime_mutex;
1143 #endif /* ndef HAVE_GMTIME_R */
1145 #ifndef HAVE_LOCALTIME_R
1146 pthread_mutex_t localtime_mutex;
1147 #endif /* ndef HAVE_GMTIME_R */
1150 pthread_mutex_t rand_mutex;
1151 #endif /* ndef HAVE_RANDOM */
1153 #endif /* FEATURE_PTHREAD */
1155 #if defined(unix) || defined(__EMX__)
1156 const char *basedir = NULL;
1157 const char *pidfile = NULL;
1158 int received_hup_signal = 0;
1159 #endif /* defined unix */
1161 /* HTTP snipplets. */
1162 static const char CSUCCEED[] =
1163 "HTTP/1.0 200 Connection established\r\n"
1164 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1166 static const char CHEADER[] =
1167 "HTTP/1.0 400 Invalid header received from client\r\n"
1168 "Proxy-Agent: Privoxy " VERSION "\r\n"
1169 "Content-Type: text/plain\r\n"
1170 "Connection: close\r\n\r\n"
1171 "Invalid header received from client.\r\n";
1173 static const char FTP_RESPONSE[] =
1174 "HTTP/1.0 400 Invalid request received from client\r\n"
1175 "Content-Type: text/plain\r\n"
1176 "Connection: close\r\n\r\n"
1177 "Invalid request. Privoxy doesn't support FTP.\r\n";
1179 static const char GOPHER_RESPONSE[] =
1180 "HTTP/1.0 400 Invalid request received from client\r\n"
1181 "Content-Type: text/plain\r\n"
1182 "Connection: close\r\n\r\n"
1183 "Invalid request. Privoxy doesn't support gopher.\r\n";
1185 /* XXX: should be a template */
1186 static const char MISSING_DESTINATION_RESPONSE[] =
1187 "HTTP/1.0 400 Bad request received from client\r\n"
1188 "Proxy-Agent: Privoxy " VERSION "\r\n"
1189 "Content-Type: text/plain\r\n"
1190 "Connection: close\r\n\r\n"
1191 "Bad request. Privoxy was unable to extract the destination.\r\n";
1193 /* XXX: should be a template */
1194 static const char NO_SERVER_DATA_RESPONSE[] =
1195 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1196 "Proxy-Agent: Privoxy " VERSION "\r\n"
1197 "Content-Type: text/plain\r\n"
1198 "Connection: close\r\n\r\n"
1199 "Empty server or forwarder response.\r\n"
1200 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1202 /* XXX: should be a template */
1203 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1204 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1205 "Proxy-Agent: Privoxy " VERSION "\r\n"
1206 "Content-Type: text/plain\r\n"
1207 "Connection: close\r\n\r\n"
1208 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1211 /* XXX: should be a template */
1212 static const char NULL_BYTE_RESPONSE[] =
1213 "HTTP/1.0 400 Bad request received from client\r\n"
1214 "Proxy-Agent: Privoxy " VERSION "\r\n"
1215 "Content-Type: text/plain\r\n"
1216 "Connection: close\r\n\r\n"
1217 "Bad request. Null byte(s) before end of request.\r\n";
1220 /* XXX: should be a template */
1221 static const char MESSED_UP_REQUEST_RESPONSE[] =
1222 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1223 "Proxy-Agent: Privoxy " VERSION "\r\n"
1224 "Content-Type: text/plain\r\n"
1225 "Connection: close\r\n\r\n"
1226 "Bad request. Messed up with header filters.\r\n";
1228 /* A function to crunch a response */
1229 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1231 /* Crunch function flags */
1232 #define CF_NO_FLAGS 0
1233 /* Cruncher applies to forced requests as well */
1234 #define CF_IGNORE_FORCE 1
1235 /* Crunched requests are counted for the block statistics */
1236 #define CF_COUNT_AS_REJECT 2
1238 /* A crunch function and its flags */
1241 const crunch_func_ptr cruncher;
1245 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1247 /* Complete list of cruncher functions */
1248 static const struct cruncher crunchers_all[] = {
1249 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1250 { block_url, CF_COUNT_AS_REJECT },
1251 #ifdef FEATURE_TRUST
1252 { trust_url, CF_COUNT_AS_REJECT },
1253 #endif /* def FEATURE_TRUST */
1254 { redirect_url, CF_NO_FLAGS },
1255 { dispatch_cgi, CF_IGNORE_FORCE},
1259 /* Light version, used after tags are applied */
1260 static const struct cruncher crunchers_light[] = {
1261 { block_url, CF_COUNT_AS_REJECT },
1262 { redirect_url, CF_NO_FLAGS },
1267 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1268 /*********************************************************************
1270 * Function : sig_handler
1272 * Description : Signal handler for different signals.
1273 * Exit gracefully on TERM and INT
1274 * or set a flag that will cause the errlog
1275 * to be reopened by the main thread on HUP.
1278 * 1 : the_signal = the signal cause this function to call
1282 *********************************************************************/
1283 static void sig_handler(int the_signal)
1289 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1300 received_hup_signal = 1;
1305 * We shouldn't be here, unless we catch signals
1306 * in main() that we can't handle here!
1308 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1316 /*********************************************************************
1318 * Function : client_protocol_is_unsupported
1320 * Description : Checks if the client used a known unsupported
1321 * protocol and deals with it by sending an error
1325 * 1 : csp = Current client state (buffers, headers, etc...)
1326 * 2 : req = the first request line send by the client
1328 * Returns : TRUE if an error response has been generated, or
1329 * FALSE if the request doesn't look invalid.
1331 *********************************************************************/
1332 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1335 * If it's a FTP or gopher request, we don't support it.
1337 * These checks are better than nothing, but they might
1338 * not work in all configurations and some clients might
1339 * have problems digesting the answer.
1341 * They should, however, never cause more problems than
1342 * Privoxy's old behaviour (returning the misleading HTML
1345 * "Could not resolve http://(ftp|gopher)://example.org").
1347 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1349 const char *response = NULL;
1350 const char *protocol = NULL;
1352 if (!strncmpic(req, "GET ftp://", 10))
1354 response = FTP_RESPONSE;
1359 response = GOPHER_RESPONSE;
1360 protocol = "GOPHER";
1362 log_error(LOG_LEVEL_ERROR,
1363 "%s tried to use Privoxy as %s proxy: %s",
1364 csp->ip_addr_str, protocol, req);
1365 log_error(LOG_LEVEL_CLF,
1366 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1368 write_socket(csp->cfd, response, strlen(response));
1377 /*********************************************************************
1379 * Function : get_request_destination_elsewhere
1381 * Description : If the client's request was redirected into
1382 * Privoxy without the client's knowledge,
1383 * the request line lacks the destination host.
1385 * This function tries to get it elsewhere,
1386 * provided accept-intercepted-requests is enabled.
1388 * "Elsewhere" currently only means "Host: header",
1389 * but in the future we may ask the redirecting
1390 * packet filter to look the destination up.
1392 * If the destination stays unknown, an error
1393 * response is send to the client and headers
1394 * are freed so that chat() can return directly.
1397 * 1 : csp = Current client state (buffers, headers, etc...)
1398 * 2 : headers = a header list
1400 * Returns : JB_ERR_OK if the destination is now known, or
1401 * JB_ERR_PARSE if it isn't.
1403 *********************************************************************/
1404 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1408 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1410 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1411 " Privoxy isn't configured to accept intercepted requests.",
1412 csp->ip_addr_str, csp->http->cmd);
1413 /* XXX: Use correct size */
1414 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1415 csp->ip_addr_str, csp->http->cmd);
1417 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1418 destroy_list(headers);
1420 return JB_ERR_PARSE;
1422 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1424 /* Split the domain we just got for pattern matching */
1425 init_domain_components(csp->http);
1431 /* We can't work without destination. Go spread the news.*/
1433 req = list_to_text(headers);
1435 /* XXX: Use correct size */
1436 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1437 csp->ip_addr_str, csp->http->cmd);
1438 log_error(LOG_LEVEL_ERROR,
1439 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1440 csp->ip_addr_str, csp->http->cmd, req);
1443 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1444 destroy_list(headers);
1446 return JB_ERR_PARSE;
1449 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1450 * to get the destination IP address, use it as host directly
1451 * or do a reverse DNS lookup first.
1456 /*********************************************************************
1458 * Function : get_server_headers
1460 * Description : Parses server headers in iob and fills them
1461 * into csp->headers so that they can later be
1465 * 1 : csp = Current client state (buffers, headers, etc...)
1467 * Returns : JB_ERR_OK if everything went fine, or
1468 * JB_ERR_PARSE if the headers were incomplete.
1470 *********************************************************************/
1471 static jb_err get_server_headers(struct client_state *csp)
1473 int continue_hack_in_da_house = 0;
1476 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1481 * continue hack in da house. Ignore the ending of
1482 * this head and continue enlisting header lines.
1483 * The reason is described below.
1485 enlist(csp->headers, "");
1486 continue_hack_in_da_house = 0;
1489 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1492 * It's a bodyless continue response, don't
1493 * stop header parsing after reaching it's end.
1495 * As a result Privoxy will concatenate the
1496 * next response's head and parse and deliver
1497 * the headers as if they belonged to one request.
1499 * The client will separate them because of the
1500 * empty line between them.
1502 * XXX: What we're doing here is clearly against
1503 * the intended purpose of the continue header,
1504 * and under some conditions (HTTP/1.0 client request)
1505 * it's a standard violation.
1507 * Anyway, "sort of against the spec" is preferable
1508 * to "always getting confused by Continue responses"
1509 * (Privoxy's behaviour before this hack was added)
1511 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1512 continue_hack_in_da_house = 1;
1514 else if (*header == '\0')
1517 * If the header is empty, but the Continue hack
1518 * isn't active, we can assume that we reached the
1519 * end of the buffer before we hit the end of the
1522 * Inform the caller an let it decide how to handle it.
1524 return JB_ERR_PARSE;
1527 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1530 * XXX: Should we quit the request and return a
1531 * out of memory error page instead?
1533 log_error(LOG_LEVEL_ERROR,
1534 "Out of memory while enlisting server headers. %s lost.",
1544 /*********************************************************************
1546 * Function : crunch_reason
1548 * Description : Translates the crunch reason code into a string.
1551 * 1 : rsp = a http_response
1553 * Returns : A string with the crunch reason or an error description.
1555 *********************************************************************/
1556 static const char *crunch_reason(const struct http_response *rsp)
1558 char * reason = NULL;
1560 assert(rsp != NULL);
1563 return "Internal error while searching for crunch reason";
1566 switch (rsp->reason)
1568 case RSP_REASON_UNSUPPORTED:
1569 reason = "Unsupported HTTP feature";
1571 case RSP_REASON_BLOCKED:
1574 case RSP_REASON_UNTRUSTED:
1575 reason = "Untrusted";
1577 case RSP_REASON_REDIRECTED:
1578 reason = "Redirected";
1580 case RSP_REASON_CGI_CALL:
1581 reason = "CGI Call";
1583 case RSP_REASON_NO_SUCH_DOMAIN:
1584 reason = "DNS failure";
1586 case RSP_REASON_FORWARDING_FAILED:
1587 reason = "Forwarding failed";
1589 case RSP_REASON_CONNECT_FAILED:
1590 reason = "Connection failure";
1592 case RSP_REASON_OUT_OF_MEMORY:
1593 reason = "Out of memory (may mask other reasons)";
1596 reason = "No reason recorded";
1604 /*********************************************************************
1606 * Function : send_crunch_response
1608 * Description : Delivers already prepared response for
1609 * intercepted requests, logs the interception
1610 * and frees the response.
1613 * 1 : csp = Current client state (buffers, headers, etc...)
1614 * 1 : rsp = Fully prepared response. Will be freed on exit.
1616 * Returns : Nothing.
1618 *********************************************************************/
1619 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1621 const struct http_request *http = csp->http;
1622 char status_code[4];
1624 assert(rsp != NULL);
1625 assert(rsp->head != NULL);
1630 * Not supposed to happen. If it does
1631 * anyway, treat it as an unknown error.
1633 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1634 /* return code doesn't matter */
1639 /* If rsp is still NULL, we have serious internal problems. */
1640 log_error(LOG_LEVEL_FATAL,
1641 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1645 * Extract the status code from the actual head
1646 * that was send to the client. It is the only
1647 * way to get it right for all requests, including
1648 * the fixed ones for out-of-memory problems.
1650 * A head starts like this: 'HTTP/1.1 200...'
1654 status_code[0] = rsp->head[9];
1655 status_code[1] = rsp->head[10];
1656 status_code[2] = rsp->head[11];
1657 status_code[3] = '\0';
1659 /* Write the answer to the client */
1660 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1661 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1663 /* There is nothing we can do about it. */
1664 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1667 /* Log that the request was crunched and why. */
1668 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1669 http->hostport, http->path, crunch_reason(rsp));
1670 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1671 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1673 /* Clean up and return */
1674 if (cgi_error_memory() != rsp)
1676 free_http_response(rsp);
1683 /*********************************************************************
1685 * Function : request_contains_null_bytes
1687 * Description : Checks for NULL bytes in the request and sends
1688 * an error message to the client if any were found.
1690 * XXX: currently not used, see comment in chat().
1693 * 1 : csp = Current client state (buffers, headers, etc...)
1694 * 2 : buf = Data from the client's request to check.
1695 * 3 : len = The data length.
1697 * Returns : TRUE if the request contained one or more NULL bytes, or
1700 *********************************************************************/
1701 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1703 size_t c_len; /* Request lenght when treated as C string */
1705 c_len = strlen(buf);
1710 * Null byte(s) found. Log the request,
1711 * return an error response and hang up.
1713 size_t tmp_len = c_len;
1718 * Replace NULL byte(s) with '°' characters
1719 * so the request can be logged as string.
1720 * XXX: Is there a better replacement character?
1723 tmp_len += strlen(buf+tmp_len);
1724 } while (tmp_len < len);
1726 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1727 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1728 log_error(LOG_LEVEL_HEADER,
1729 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1731 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1733 /* XXX: Log correct size */
1734 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1744 /*********************************************************************
1746 * Function : crunch_response_triggered
1748 * Description : Checks if the request has to be crunched,
1749 * and delivers the crunch response if necessary.
1752 * 1 : csp = Current client state (buffers, headers, etc...)
1753 * 2 : crunchers = list of cruncher functions to run
1755 * Returns : TRUE if the request was answered with a crunch response
1758 *********************************************************************/
1759 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1761 struct http_response *rsp = NULL;
1762 const struct cruncher *c;
1765 * If CGI request crunching is disabled,
1766 * check the CGI dispatcher out of order to
1767 * prevent unintentional blocks or redirects.
1769 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1770 && (NULL != (rsp = dispatch_cgi(csp))))
1772 /* Deliver, log and free the interception response. */
1773 send_crunch_response(csp, rsp);
1777 for (c = crunchers; c->cruncher != NULL; c++)
1780 * Check the cruncher if either Privoxy is toggled
1781 * on and the request isn't forced, or if the cruncher
1782 * applies to forced requests as well.
1784 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1785 !(csp->flags & CSP_FLAG_FORCED)) ||
1786 (c->flags & CF_IGNORE_FORCE))
1788 rsp = c->cruncher(csp);
1791 /* Deliver, log and free the interception response. */
1792 send_crunch_response(csp, rsp);
1793 #ifdef FEATURE_STATISTICS
1794 if (c->flags & CF_COUNT_AS_REJECT)
1796 csp->flags |= CSP_FLAG_REJECTED;
1798 #endif /* def FEATURE_STATISTICS */
1809 /*********************************************************************
1811 * Function : build_request_line
1813 * Description : Builds the HTTP request line.
1815 * If a HTTP forwarder is used it expects the whole URL,
1816 * web servers only get the path.
1819 * 1 : csp = Current client state (buffers, headers, etc...)
1820 * 2 : fwd = The forwarding spec used for the request
1821 * XXX: Should use http->fwd instead.
1822 * 3 : request_line = The old request line which will be replaced.
1824 * Returns : Nothing. Terminates in case of memory problems.
1826 *********************************************************************/
1827 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1829 struct http_request *http = csp->http;
1831 assert(http->ssl == 0);
1834 * Downgrade http version from 1.1 to 1.0
1835 * if +downgrade action applies.
1837 if ( (csp->action->flags & ACTION_DOWNGRADE)
1838 && (!strcmpic(http->ver, "HTTP/1.1")))
1841 http->ver = strdup("HTTP/1.0");
1843 if (http->ver == NULL)
1845 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1850 * Rebuild the request line.
1852 freez(*request_line);
1853 *request_line = strdup(http->gpc);
1854 string_append(request_line, " ");
1856 if (fwd->forward_host)
1858 string_append(request_line, http->url);
1862 string_append(request_line, http->path);
1864 string_append(request_line, " ");
1865 string_append(request_line, http->ver);
1867 if (*request_line == NULL)
1869 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1871 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1875 /*********************************************************************
1877 * Function : change_request_destination
1879 * Description : Parse a (rewritten) request line and regenerate
1880 * the http request data.
1883 * 1 : csp = Current client state (buffers, headers, etc...)
1885 * Returns : Forwards the parse_http_request() return code.
1886 * Terminates in case of memory problems.
1888 *********************************************************************/
1889 static jb_err change_request_destination(struct client_state *csp)
1891 struct http_request *http = csp->http;
1894 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1895 free_http_request(http);
1896 err = parse_http_request(csp->headers->first->str, http, csp);
1897 if (JB_ERR_OK != err)
1899 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1900 jb_err_to_string(err));
1902 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1903 if (http->ocmd == NULL)
1905 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1912 /*********************************************************************
1916 * Description : Once a connection to the client has been accepted,
1917 * this function is called (via serve()) to handle the
1918 * main business of the communication. When this
1919 * function returns, the caller must close the client
1922 * FIXME: chat is nearly thousand lines long.
1926 * 1 : csp = Current client state (buffers, headers, etc...)
1928 * Returns : Nothing.
1930 *********************************************************************/
1931 static void chat(struct client_state *csp)
1933 char buf[BUFFER_SIZE];
1941 int ms_iis5_hack = 0;
1942 size_t byte_count = 0;
1943 int forwarded_connect_retries = 0;
1944 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1945 const struct forward_spec * fwd;
1946 struct http_request *http;
1947 int len; /* for buffer sizes (and negative error codes) */
1950 /* Function that does the content filtering for the current request */
1951 filter_function_ptr content_filter = NULL;
1953 /* Skeleton for HTTP response, if we should intercept the request */
1954 struct http_response *rsp;
1956 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1957 struct list header_list;
1958 struct list *headers = &header_list;
1962 memset(buf, 0, sizeof(buf));
1965 * Read the client's request. Note that since we're not using select() we
1966 * could get blocked here if a client connected, then didn't say anything!
1971 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1973 if (len <= 0) break; /* error! */
1976 * If there is no memory left for buffering the
1977 * request, there is nothing we can do but hang up
1979 if (add_to_iob(csp, buf, len))
1984 req = get_header(csp);
1986 } while ((NULL != req) && ('\0' == *req));
1988 if ((NULL != req) && ('\0' != *req))
1990 /* Request received. Validate and parse it. */
1994 * XXX: Temporary disabled to prevent problems
1995 * with POST requests whose bodies are allowed to
1996 * contain NULL bytes. BR#1730105.
1998 * The main purpose of this check is to properly
1999 * log stuff like BitTorrent traffic and other junk
2000 * that hits public proxies. It's not required for
2001 * Privoxy to functions as those requests are discarded
2004 * It probably should be rewritten to only check
2005 * the head of the request. Another option would
2006 * be to let all POST requests pass, although that
2007 * may not be good enough.
2009 if (request_contains_null_bytes(csp, buf, len))
2011 /* NULL bytes found and dealt with, just hang up. */
2016 /* Does the request line look invalid? */
2017 if (client_protocol_is_unsupported(csp, req))
2020 * Yes. The request has already been
2021 * answered with a error response, the buffers
2022 * were freed and we're done with chatting.
2027 #ifdef FEATURE_FORCE_LOAD
2029 * If this request contains the FORCE_PREFIX and blocks
2030 * aren't enforced, get rid of it and set the force flag.
2032 if (strstr(req, FORCE_PREFIX))
2034 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2036 log_error(LOG_LEVEL_FORCE,
2037 "Ignored force prefix in request: \"%s\".", req);
2041 strclean(req, FORCE_PREFIX);
2042 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2043 csp->flags |= CSP_FLAG_FORCED;
2047 #endif /* def FEATURE_FORCE_LOAD */
2048 err = parse_http_request(req, http, csp);
2049 if (JB_ERR_OK != err)
2051 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2057 if (http->cmd == NULL)
2059 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2060 /* XXX: Use correct size */
2061 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2062 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2064 free_http_request(http);
2068 /* grab the rest of the client's headers */
2072 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2074 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2077 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2078 destroy_list(headers);
2083 * If there is no memory left for buffering the
2084 * request, there is nothing we can do but hang up
2086 if (add_to_iob(csp, buf, len))
2088 destroy_list(headers);
2094 if (p == NULL) break;
2101 if (http->host == NULL)
2104 * If we still don't know the request destination,
2105 * the request is invalid or the client uses
2106 * Privoxy without its knowledge.
2108 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2111 * Our attempts to get the request destination
2112 * elsewhere failed or Privoxy is configured
2113 * to only accept proxy requests.
2115 * An error response has already been send
2116 * and we're done here.
2123 * Determine the actions for this URL
2125 #ifdef FEATURE_TOGGLE
2126 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2128 /* Most compatible set of actions (i.e. none) */
2129 init_current_action(csp->action);
2132 #endif /* ndef FEATURE_TOGGLE */
2134 get_url_actions(csp, http);
2138 * Save a copy of the original request for logging
2140 http->ocmd = strdup(http->cmd);
2142 if (http->ocmd == NULL)
2144 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2147 enlist(csp->headers, http->cmd);
2149 /* Append the previously read headers */
2150 list_append_list_unique(csp->headers, headers);
2151 destroy_list(headers);
2153 err = sed(client_patterns, add_client_headers, csp);
2154 if (JB_ERR_OK != err)
2156 assert(err == JB_ERR_PARSE);
2157 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2159 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2161 /* Check request line for rewrites. */
2162 if ((NULL == csp->headers->first->str)
2163 || (strcmp(http->cmd, csp->headers->first->str) &&
2164 (JB_ERR_OK != change_request_destination(csp))))
2167 * A header filter broke the request line - bail out.
2169 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2170 /* XXX: Use correct size */
2171 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2172 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2174 free_http_request(http);
2178 /* decide how to route the HTTP request */
2179 fwd = forward_url(csp, http);
2182 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2183 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2187 * build the http request to send to the server
2188 * we have to do one of the following:
2190 * create = use the original HTTP request to create a new
2191 * HTTP request that has either the path component
2192 * without the http://domainspec (w/path) or the
2193 * full orininal URL (w/url)
2194 * Note that the path and/or the HTTP version may
2195 * have been altered by now.
2197 * connect = Open a socket to the host:port of the server
2198 * and short-circuit server and client socket.
2200 * pass = Pass the request unchanged if forwarding a CONNECT
2201 * request to a parent proxy. Note that we'll be sending
2202 * the CFAIL message ourselves if connecting to the parent
2203 * fails, but we won't send a CSUCCEED message if it works,
2204 * since that would result in a double message (ours and the
2205 * parent's). After sending the request to the parent, we simply
2208 * here's the matrix:
2211 * +--------+--------+
2213 * 0 | create | connect|
2215 * Forwarding +--------+--------+
2217 * 1 | create | pass |
2219 * +--------+--------+
2223 if (http->ssl && connect_port_is_forbidden(csp))
2225 const char *acceptable_connect_ports =
2226 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2227 assert(NULL != acceptable_connect_ports);
2228 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2229 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2230 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2231 csp->action->flags |= ACTION_BLOCK;
2237 freez(csp->headers->first->str);
2238 build_request_line(csp, fwd, &csp->headers->first->str);
2241 hdr = list_to_text(csp->headers);
2244 /* FIXME Should handle error properly */
2245 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2249 * We have a request. Check if one of the crunchers wants it.
2251 if (crunch_response_triggered(csp, crunchers_all))
2254 * Yes. The client got the crunch response
2255 * and we are done here after cleaning up.
2258 list_remove_all(csp->headers);
2264 * The headers can't be removed earlier because
2265 * they were still needed for the referrer check
2266 * in case of CGI crunches.
2268 * XXX: Would it be worth to move the referrer check
2269 * into client_referrer() and set a flag if it's trusted?
2271 list_remove_all(csp->headers);
2273 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2275 if (fwd->forward_host)
2277 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2278 fwd->forward_host, fwd->forward_port, http->hostport);
2282 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2285 /* here we connect to the server, gateway, or the forwarder */
2287 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2288 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2290 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2291 forwarded_connect_retries, http->hostport);
2294 if (csp->sfd == JB_INVALID_SOCKET)
2296 if (fwd->type != SOCKS_NONE)
2299 rsp = error_response(csp, "forwarding-failed", errno);
2301 else if (errno == EINVAL)
2303 rsp = error_response(csp, "no-such-domain", errno);
2307 rsp = error_response(csp, "connect-failed", errno);
2308 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2313 /* Write the answer to the client */
2316 send_crunch_response(csp, rsp);
2323 if (fwd->forward_host || (http->ssl == 0))
2325 /* write the client's (modified) header to the server
2326 * (along with anything else that may be in the buffer)
2329 if (write_socket(csp->sfd, hdr, strlen(hdr))
2330 || (flush_socket(csp->sfd, csp->iob) < 0))
2332 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2335 rsp = error_response(csp, "connect-failed", errno);
2339 send_crunch_response(csp, rsp);
2349 * We're running an SSL tunnel and we're not forwarding,
2350 * so just send the "connect succeeded" message to the
2351 * client, flush the rest, and get out of the way.
2353 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2361 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2363 /* we're finished with the client's header */
2366 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2368 /* pass data between the client and server
2369 * until one or the other shuts down the connection.
2378 * FD_ZERO here seems to point to an errant macro which crashes.
2379 * So do this by hand for now...
2381 memset(&rfds,0x00,sizeof(fd_set));
2385 FD_SET(csp->cfd, &rfds);
2386 FD_SET(csp->sfd, &rfds);
2388 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2392 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2396 /* this is the body of the browser's request
2397 * just read it and write it.
2400 if (FD_ISSET(csp->cfd, &rfds))
2402 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2406 break; /* "game over, man" */
2409 if (write_socket(csp->sfd, buf, (size_t)len))
2411 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2418 * The server wants to talk. It could be the header or the body.
2419 * If `hdr' is null, then it's the header otherwise it's the body.
2420 * FIXME: Does `hdr' really mean `host'? No.
2424 if (FD_ISSET(csp->sfd, &rfds))
2427 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2431 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2433 if (http->ssl && (fwd->forward_host == NULL))
2436 * Just hang up. We already confirmed the client's CONNECT
2437 * request with status code 200 and unencrypted content is
2438 * no longer welcome.
2440 log_error(LOG_LEVEL_ERROR,
2441 "CONNECT already confirmed. Unable to tell the client about the problem.");
2444 else if (byte_count)
2447 * Just hang up. We already transmitted the original headers
2448 * and parts of the original content and therefore missed the
2449 * chance to send an error message (without risking data corruption).
2451 * XXX: we could retry with a fancy range request here.
2453 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2454 "Unable to tell the client about the problem.");
2458 rsp = error_response(csp, "connect-failed", errno);
2462 send_crunch_response(csp, rsp);
2468 /* Add a trailing zero. This lets filter_popups
2469 * use string operations.
2473 /* Normally, this would indicate that we've read
2474 * as much as the server has sent us and we can
2475 * close the client connection. However, Microsoft
2476 * in its wisdom has released IIS/5 with a bug that
2477 * prevents it from sending the trailing \r\n in
2478 * a 302 redirect header (and possibly other headers).
2479 * To work around this if we've haven't parsed
2480 * a full header we'll append a trailing \r\n
2481 * and see if this now generates a valid one.
2483 * This hack shouldn't have any impacts. If we've
2484 * already transmitted the header or if this is a
2485 * SSL connection, then we won't bother with this
2486 * hack. So we only work on partially received
2487 * headers. If we append a \r\n and this still
2488 * doesn't generate a valid header, then we won't
2489 * transmit anything to the client.
2494 if (server_body || http->ssl)
2497 * If we have been buffering up the document,
2498 * now is the time to apply content modification
2499 * and send the result to the client.
2503 p = execute_content_filter(csp, content_filter);
2505 * If the content filter fails, use the original
2506 * buffer and length.
2507 * (see p != NULL ? p : csp->iob->cur below)
2511 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2514 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2516 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2519 hdr = list_to_text(csp->headers);
2522 /* FIXME Should handle error properly */
2523 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2527 * Shouldn't happen because this was the second sed run
2528 * and tags are only created for the first one.
2530 assert(!crunch_response_triggered(csp, crunchers_all));
2532 if (write_socket(csp->cfd, hdr, strlen(hdr))
2533 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2535 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2545 break; /* "game over, man" */
2549 * This is NOT the body, so
2550 * Let's pretend the server just sent us a blank line.
2552 snprintf(buf, sizeof(buf), "\r\n");
2553 len = (int)strlen(buf);
2556 * Now, let the normal header parsing algorithm below do its
2557 * job. If it fails, we'll exit instead of continuing.
2564 * If this is an SSL connection or we're in the body
2565 * of the server document, just write it to the client,
2566 * unless we need to buffer the body for later content-filtering
2569 if (server_body || http->ssl)
2574 * If there is no memory left for buffering the content, or the buffer limit
2575 * has been reached, switch to non-filtering mode, i.e. make & write the
2576 * header, flush the iob and buf, and get out of the way.
2578 if (add_to_iob(csp, buf, len))
2583 log_error(LOG_LEVEL_INFO, "Flushing header and buffers. Stepping back from filtering.");
2585 hdr = list_to_text(csp->headers);
2589 * Memory is too tight to even generate the header.
2590 * Send our static "Out-of-memory" page.
2592 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2593 rsp = cgi_error_memory();
2594 send_crunch_response(csp, rsp);
2598 hdrlen = strlen(hdr);
2600 if (write_socket(csp->cfd, hdr, hdrlen)
2601 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
2602 || (write_socket(csp->cfd, buf, (size_t)len)))
2604 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2611 * Reset the byte_count to the amount of bytes
2612 * we just flushed. len will be added a few lines below,
2613 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2615 byte_count = (size_t)flushed;
2617 content_filter = NULL;
2623 if (write_socket(csp->cfd, buf, (size_t)len))
2625 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2629 byte_count += (size_t)len;
2634 /* we're still looking for the end of the
2635 * server's header ... (does that make header
2636 * parsing an "out of body experience" ?
2640 * buffer up the data we just read. If that fails,
2641 * there's little we can do but send our static
2642 * out-of-memory page.
2644 if (add_to_iob(csp, buf, len))
2646 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2647 rsp = cgi_error_memory();
2648 send_crunch_response(csp, rsp);
2653 /* Convert iob into something sed() can digest */
2654 if (JB_ERR_PARSE == get_server_headers(csp))
2658 /* Well, we tried our MS IIS/5
2659 * hack and it didn't work.
2660 * The header is incomplete
2661 * and there isn't anything
2662 * we can do about it.
2664 log_error(LOG_LEVEL_INFO,
2665 "MS IIS5 hack didn't produce valid headers.");
2670 /* Since we have to wait for
2671 * more from the server before
2672 * we can parse the headers
2673 * we just continue here.
2679 /* Did we actually get anything? */
2680 if (NULL == csp->headers->first)
2682 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2683 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2684 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2685 free_http_request(http);
2689 assert(csp->headers->first->str);
2691 if (strncmpic(csp->headers->first->str, "HTTP", 4))
2694 * It doesn't look like a HTTP response:
2695 * tell the client and log the problem.
2697 if (strlen(csp->headers->first->str) > 30)
2699 csp->headers->first->str[30] = '\0';
2701 log_error(LOG_LEVEL_ERROR,
2702 "Invalid server or forwarder response. Starts with: %s",
2703 csp->headers->first->str);
2704 log_error(LOG_LEVEL_CLF,
2705 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2706 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2707 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2708 free_http_request(http);
2712 /* we have now received the entire header.
2713 * filter it and send the result to the client
2715 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2717 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2719 hdr = list_to_text(csp->headers);
2722 /* FIXME Should handle error properly */
2723 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2726 if (crunch_response_triggered(csp, crunchers_light))
2729 * One of the tags created by a server-header
2730 * tagger triggered a crunch. We already
2731 * delivered the crunch response to the client
2732 * and are done here after cleaning up.
2737 /* Buffer and pcrs filter this if appropriate. */
2739 if (!http->ssl) /* We talk plaintext */
2741 content_filter = get_filter_function(csp);
2744 * Only write if we're not buffering for content modification
2746 if (!content_filter)
2748 /* write the server's (modified) header to
2749 * the client (along with anything else that
2750 * may be in the buffer)
2753 if (write_socket(csp->cfd, hdr, strlen(hdr))
2754 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
2756 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2758 /* the write failed, so don't bother
2759 * mentioning it to the client...
2760 * it probably can't hear us anyway.
2766 byte_count += (size_t)len;
2769 /* we're finished with the server's header */
2774 /* If this was a MS IIS/5 hack then it means
2775 * the server has already closed the
2776 * connection. Nothing more to read. Time
2781 log_error(LOG_LEVEL_INFO,
2782 "Closed server connection detected with MS IIS5 hack enabled.");
2789 return; /* huh? we should never get here */
2792 if (csp->content_length == 0)
2795 * If Privoxy didn't recalculate the
2796 * Content-Lenght, byte_count is still
2799 csp->content_length = byte_count;
2802 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2803 csp->ip_addr_str, http->ocmd, csp->content_length);
2807 /*********************************************************************
2811 * Description : This is little more than chat. We only "serve" to
2812 * to close any socket that chat may have opened.
2815 * 1 : csp = Current client state (buffers, headers, etc...)
2819 *********************************************************************/
2821 void serve(struct client_state *csp)
2822 #else /* ifndef AMIGA */
2823 static void serve(struct client_state *csp)
2824 #endif /* def AMIGA */
2827 close_socket(csp->cfd);
2829 if (csp->sfd != JB_INVALID_SOCKET)
2831 close_socket(csp->sfd);
2834 csp->flags &= ~CSP_FLAG_ACTIVE;
2840 /*********************************************************************
2842 * Function : server_thread
2844 * Description : We only exist to call `serve' in a threaded environment.
2847 * 1 : data = Current client state (buffers, headers, etc...)
2849 * Returns : Always 0.
2851 *********************************************************************/
2852 static int32 server_thread(void *data)
2854 serve((struct client_state *) data);
2861 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2862 /*********************************************************************
2866 * Description : Print usage info & exit.
2868 * Parameters : Pointer to argv[0] for identifying ourselves
2872 *********************************************************************/
2873 static void usage(const char *myname)
2875 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2879 #endif /* defined(unix) */
2882 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2883 #endif /* defined(unix) */
2884 "[--version] [configfile]\n"
2885 "Aborting\n", myname);
2890 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2893 /*********************************************************************
2895 * Function : initialize_mutexes
2897 * Description : Prepares mutexes if mutex support is available.
2901 * Returns : Void, exits in case of errors.
2903 *********************************************************************/
2904 static void initialize_mutexes(void)
2908 #ifdef FEATURE_PTHREAD
2910 * Prepare global mutex semaphores
2912 err = pthread_mutex_init(&log_mutex, 0);
2914 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2917 * XXX: The assumptions below are a bit naive
2918 * and can cause locks that aren't necessary.
2920 * For example older FreeBSD versions (< 6.x?)
2921 * have no gethostbyname_r, but gethostbyname is
2924 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2925 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2926 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2928 * XXX: should we use a single mutex for
2929 * localtime() and gmtime() as well?
2931 #ifndef HAVE_GMTIME_R
2932 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2933 #endif /* ndef HAVE_GMTIME_R */
2935 #ifndef HAVE_LOCALTIME_R
2936 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2937 #endif /* ndef HAVE_GMTIME_R */
2940 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2941 #endif /* ndef HAVE_RANDOM */
2942 #endif /* FEATURE_PTHREAD */
2945 * TODO: mutex support for mingw32 would be swell.
2950 printf("Fatal error. Mutex initialization failed: %s.\n",
2959 /*********************************************************************
2963 * Description : Load the config file and start the listen loop.
2964 * This function is a lot more *sane* with the `load_config'
2965 * and `listen_loop' functions; although it stills does
2966 * a *little* too much for my taste.
2969 * 1 : argc = Number of parameters (including $0).
2970 * 2 : argv = Array of (char *)'s to the parameters.
2972 * Returns : 1 if : can't open config file, unrecognized directive,
2973 * stats requested in multi-thread mode, can't open the
2974 * log file, can't open the jar file, listen port is invalid,
2975 * any load fails, and can't bind port.
2977 * Else main never returns, the process must be signaled
2978 * to terminate execution. Or, on Windows, use the
2979 * "File", "Exit" menu option.
2981 *********************************************************************/
2983 int real_main(int argc, const char *argv[])
2985 int main(int argc, const char *argv[])
2989 unsigned int random_seed;
2991 struct passwd *pw = NULL;
2992 struct group *grp = NULL;
2995 char *pre_chroot_nslookup_to_load_resolver = NULL;
3002 #if !defined(_WIN32)
3010 * Parse the command line arguments
3012 * XXX: simply printing usage information in case of
3013 * invalid arguments isn't particularly user friendly.
3015 while (++argc_pos < argc)
3018 /* Check to see if the service must be installed or uninstalled */
3019 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3021 const char *pName = argv[argc_pos] + 9;
3024 exit( (install_service(pName)) ? 0 : 1 );
3026 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3028 const char *pName = argv[argc_pos] + 11;
3031 exit((uninstall_service(pName)) ? 0 : 1);
3033 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3035 bRunAsService = TRUE;
3036 w32_set_service_cwd();
3037 atexit(w32_service_exit_notify);
3040 #endif /* defined(_WIN32) */
3043 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3045 if (strcmp(argv[argc_pos], "--help") == 0)
3050 else if(strcmp(argv[argc_pos], "--version") == 0)
3052 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3058 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3063 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3065 if (++argc_pos == argc) usage(argv[0]);
3066 pidfile = strdup(argv[argc_pos]);
3069 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3071 if (++argc_pos == argc) usage(argv[argc_pos]);
3073 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3076 if (NULL == (grp = getgrnam(p)))
3078 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3082 if (NULL == (pw = getpwnam(argv[argc_pos])))
3084 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3087 if (p != NULL) *--p = '\0';
3090 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3092 if (++argc_pos == argc) usage(argv[0]);
3093 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3096 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3100 #endif /* defined(unix) */
3102 else if (argc_pos + 1 != argc)
3105 * This is neither the last command line
3106 * option, nor was it recognized before,
3107 * therefore it must be invalid.
3113 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3115 configfile = argv[argc_pos];
3118 } /* -END- while (more arguments) */
3121 if ( *configfile != '/' )
3123 char cwd[BUFFER_SIZE];
3125 size_t abs_file_size;
3127 /* make config-filename absolute here */
3128 if (NULL == getcwd(cwd, sizeof(cwd)))
3130 perror("failed to get current working directory");
3135 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3136 basedir = strdup(cwd);
3138 if (NULL == basedir ||
3139 NULL == (abs_file = malloc(abs_file_size)))
3141 perror("malloc failed");
3144 strlcpy(abs_file, basedir, abs_file_size);
3145 strlcat(abs_file, "/", abs_file_size );
3146 strlcat(abs_file, configfile, abs_file_size);
3147 configfile = abs_file;
3149 #endif /* defined unix */
3153 clients->next = NULL;
3155 /* XXX: factor out initialising after the next stable release. */
3158 #elif defined(_WIN32)
3162 /* Prepare mutexes if supported and necessary. */
3163 initialize_mutexes();
3165 /* Enable logging until further notice. */
3166 init_log_module(Argv[0]);
3168 random_seed = (unsigned int)time(NULL);
3170 srandom(random_seed);
3171 #elif defined (_WIN32)
3173 * See pick_from_range() in miscutil.c for details.
3175 log_error(LOG_LEVEL_INFO,
3176 "No thread-safe PRNG implemented for your platform. "
3177 "Using weak \'randomization\' factor which will "
3178 "limit the already questionable usefulness of "
3179 "header-time-randomizing actions (disabled by default).");
3182 #endif /* ifdef HAVE_RANDOM */
3185 * Unix signal handling
3187 * Catch the abort, interrupt and terminate signals for a graceful exit
3188 * Catch the hangup signal so the errlog can be reopened.
3189 * Ignore the broken pipe signals (FIXME: Why?)
3191 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3194 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3195 const int ignored_signals[] = { SIGPIPE, 0 };
3197 for (idx = 0; catched_signals[idx] != 0; idx++)
3199 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3200 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3202 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3203 #endif /* ifdef sun */
3205 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3209 for (idx = 0; ignored_signals[idx] != 0; idx++)
3211 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3213 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3218 #else /* ifdef _WIN32 */
3219 # ifdef _WIN_CONSOLE
3221 * We *are* in a windows console app.
3222 * Print a verbose messages about FAQ's and such
3224 printf("%s", win32_blurb);
3225 # endif /* def _WIN_CONSOLE */
3226 #endif /* def _WIN32 */
3229 /* Initialize the CGI subsystem */
3230 cgi_init_error_messages();
3233 * If runnig on unix and without the --nodaemon
3234 * option, become a daemon. I.e. fork, detach
3235 * from tty and get process group leadership
3248 if ( pid < 0 ) /* error */
3253 else if ( pid != 0 ) /* parent */
3258 * must check for errors
3259 * child died due to missing files aso
3262 wpid = waitpid( pid, &status, WNOHANG );
3271 /* Should be more portable, but not as well tested */
3276 #else /* ndef __FreeBSD__ */
3278 #endif /* ndef __FreeBSD__ */
3279 fd = open("/dev/tty", O_RDONLY);
3282 /* no error check here */
3283 ioctl( fd, TIOCNOTTY,0 );
3288 * stderr (fd 2) will be closed later on, when the
3289 * log file has been parsed.
3296 } /* -END- if (!no_daemon) */
3299 * As soon as we have written the PID file, we can switch
3300 * to the user and group ID indicated by the --user option
3306 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3308 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3314 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3316 /* Read the time zone file from /etc before doing chroot. */
3318 if (NULL != pre_chroot_nslookup_to_load_resolver
3319 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3321 /* Initialize resolver library. */
3322 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3324 if (chroot(pw->pw_dir) < 0)
3326 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3330 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3333 if (setuid(pw->pw_uid))
3335 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3339 char putenv_dummy[64];
3341 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3342 if (putenv(putenv_dummy) != 0)
3344 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3347 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3348 if (putenv(putenv_dummy) != 0)
3350 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3356 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3359 #endif /* defined unix */
3362 /* This will be FALSE unless the command line specified --service
3366 /* Yup, so now we must attempt to establish a connection
3367 * with the service dispatcher. This will only work if this
3368 * process was launched by the service control manager to
3369 * actually run as a service. If this isn't the case, i've
3370 * known it take around 30 seconds or so for the call to return.
3373 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3374 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3376 /* Service has run, and at this point is now being stopped, so just return */
3381 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3383 /* An error occurred. Usually it's because --service was wrongly specified
3384 * and we were unable to connect to the Service Control Dispatcher because
3385 * it wasn't expecting us and is therefore not listening.
3387 * For now, just continue below to call the listen_loop function.
3390 #endif /* def _WIN32 */
3400 /*********************************************************************
3402 * Function : bind_port_helper
3404 * Description : Bind the listen port. Handles logging, and aborts
3408 * 1 : config = Privoxy configuration. Specifies port
3411 * Returns : Port that was opened.
3413 *********************************************************************/
3414 static jb_socket bind_port_helper(struct configuration_spec * config)
3419 if (config->haddr == NULL)
3421 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3426 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3427 config->hport, config->haddr);
3430 result = bind_port(config->haddr, config->hport, &bfd);
3437 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3438 "There may be another Privoxy or some other "
3439 "proxy running on port %d",
3440 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3441 config->hport, config->hport);
3444 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3445 "The hostname is not resolvable",
3446 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3449 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3450 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3453 /* shouldn't get here */
3454 return JB_INVALID_SOCKET;
3457 config->need_bind = 0;
3464 /* Without this simple workaround we get this compiler warning from _beginthread
3465 * warning C4028: formal parameter 1 different from declaration
3467 void w32_service_listen_loop(void *p)
3471 #endif /* def _WIN32 */
3474 /*********************************************************************
3476 * Function : listen_loop
3478 * Description : bind the listen port and enter a "FOREVER" listening loop.
3484 *********************************************************************/
3485 static void listen_loop(void)
3487 struct client_state *csp = NULL;
3489 struct configuration_spec * config;
3491 config = load_config();
3493 bfd = bind_port_helper(config);
3495 #ifdef FEATURE_GRACEFUL_TERMINATION
3496 while (!g_terminate)
3501 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3502 while (waitpid(-1, NULL, WNOHANG) > 0)
3504 /* zombie children */
3506 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3509 * Free data that was used by died threads
3515 * Re-open the errlog after HUP signal
3517 if (received_hup_signal)
3519 init_error_log(Argv[0], config->logfile);
3520 received_hup_signal = 0;
3525 #ifdef FEATURE_COOKIE_JAR
3527 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3528 * already open. I think unload_configfile() is not being run, which should do
3529 * this work. Until that can get resolved, we'll use this workaround.
3533 if (csp->config->jar)
3535 fclose(csp->config->jar);
3536 csp->config->jar = NULL;
3538 #endif /* FEATURE_COOKIE_JAR */
3539 #endif /* __OS2__ */
3541 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3543 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3547 csp->flags |= CSP_FLAG_ACTIVE;
3548 csp->sfd = JB_INVALID_SOCKET;
3550 csp->config = config = load_config();
3552 if ( config->need_bind )
3555 * Since we were listening to the "old port", we will not see
3556 * a "listen" param change until the next IJB request. So, at
3557 * least 1 more request must be made for us to find the new
3558 * setting. I am simply closing the old socket and binding the
3561 * Which-ever is correct, we will serve 1 more page via the
3562 * old settings. This should probably be a "show-proxy-args"
3563 * request. This should not be a so common of an operation
3564 * that this will hurt people's feelings.
3569 bfd = bind_port_helper(config);
3572 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3574 if (!accept_connection(csp, bfd))
3576 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3589 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3592 #ifdef FEATURE_TOGGLE
3593 if (global_toggle_state)
3594 #endif /* def FEATURE_TOGGLE */
3596 csp->flags |= CSP_FLAG_TOGGLED_ON;
3599 if (run_loader(csp))
3601 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3602 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3606 if (block_acl(NULL,csp))
3608 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3609 close_socket(csp->cfd);
3613 #endif /* def FEATURE_ACL */
3615 /* add it to the list of clients */
3616 csp->next = clients->next;
3617 clients->next = csp;
3619 if (config->multi_threaded)
3623 /* this is a switch () statment in the C preprocessor - ugh */
3624 #undef SELECTED_ONE_OPTION
3626 /* Use Pthreads in preference to native code */
3627 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3628 #define SELECTED_ONE_OPTION
3630 pthread_t the_thread;
3631 pthread_attr_t attrs;
3633 pthread_attr_init(&attrs);
3634 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3635 errno = pthread_create(&the_thread, &attrs,
3636 (void * (*)(void *))serve, csp);
3637 child_id = errno ? -1 : 0;
3638 pthread_attr_destroy(&attrs);
3642 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3643 #define SELECTED_ONE_OPTION
3644 child_id = _beginthread(
3645 (void (*)(void *))serve,
3650 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3651 #define SELECTED_ONE_OPTION
3652 child_id = _beginthread(
3653 (void(* _Optlink)(void*))serve,
3659 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3660 #define SELECTED_ONE_OPTION
3662 thread_id tid = spawn_thread
3663 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3665 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3667 child_id = (int) tid;
3676 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3677 #define SELECTED_ONE_OPTION
3678 csp->cfd = ReleaseSocket(csp->cfd, -1);
3681 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3682 NP_Output, Output(),
3683 NP_CloseOutput, FALSE,
3684 NP_Name, (ULONG)"privoxy child",
3688 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3689 NP_Output, Output(),
3690 NP_CloseOutput, FALSE,
3691 NP_Name, (ULONG)"privoxy child",
3692 NP_StackSize, 200*1024,
3698 ((struct Task *)child_id)->tc_UserData = csp;
3699 Signal((struct Task *)child_id, SIGF_SINGLE);
3704 #if !defined(SELECTED_ONE_OPTION)
3707 /* This block is only needed when using fork().
3708 * When using threads, the server thread was
3709 * created and run by the call to _beginthread().
3711 if (child_id == 0) /* child */
3714 #ifdef FEATURE_TOGGLE
3715 int inherited_toggle_state = global_toggle_state;
3716 #endif /* def FEATURE_TOGGLE */
3721 * If we've been toggled or we've blocked the request, tell Mom
3724 #ifdef FEATURE_TOGGLE
3725 if (inherited_toggle_state != global_toggle_state)
3727 rc |= RC_FLAG_TOGGLED;
3729 #endif /* def FEATURE_TOGGLE */
3731 #ifdef FEATURE_STATISTICS
3732 if (csp->flags & CSP_FLAG_REJECTED)
3734 rc |= RC_FLAG_BLOCKED;
3736 #endif /* ndef FEATURE_STATISTICS */
3740 else if (child_id > 0) /* parent */
3742 /* in a fork()'d environment, the parent's
3743 * copy of the client socket and the CSP
3747 #if !defined(_WIN32) && !defined(__CYGWIN__)
3749 wait( &child_status );
3752 * Evaluate child's return code: If the child has
3753 * - been toggled, toggle ourselves
3754 * - blocked its request, bump up the stats counter
3757 #ifdef FEATURE_TOGGLE
3758 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3760 global_toggle_state = !global_toggle_state;
3762 #endif /* def FEATURE_TOGGLE */
3764 #ifdef FEATURE_STATISTICS
3766 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3770 #endif /* def FEATURE_STATISTICS */
3772 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3773 close_socket(csp->cfd);
3774 csp->flags &= ~CSP_FLAG_ACTIVE;
3778 #undef SELECTED_ONE_OPTION
3779 /* end of cpp switch () */
3781 if (child_id < 0) /* failed */
3783 char buf[BUFFER_SIZE];
3785 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3787 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3789 write_socket(csp->cfd, buf, strlen(buf));
3790 close_socket(csp->cfd);
3791 csp->flags &= ~CSP_FLAG_ACTIVE;
3802 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3804 /* Clean up. Aim: free all memory (no leaks) */
3805 #ifdef FEATURE_GRACEFUL_TERMINATION
3807 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3809 unload_current_config_file();
3810 unload_current_actions_file();
3811 unload_current_re_filterfile();
3812 #ifdef FEATURE_TRUST
3813 unload_current_trust_file();
3816 if (config->multi_threaded)
3823 } while ((clients->next != NULL) && (--i > 0));
3827 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3838 #ifdef FEATURE_COOKIE_JAR
3839 if (NULL != config->jar)
3841 fclose(config->jar);
3845 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3846 /* Cleanup - remove taskbar icon etc. */
3851 #endif /* FEATURE_GRACEFUL_TERMINATION */