1 const char jcc_rcs[] = "$Id: jcc.c,v 1.146 2007/08/20 17:09:32 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/jcc.c,v $
6 * Purpose : Main file. Contains main() method, main loop, and
7 * the main connection-handling function.
9 * Copyright : Written by and Copyright (C) 2001-2007 the SourceForge
10 * Privoxy team. http://www.privoxy.org/
12 * Based on the Internet Junkbuster originally written
13 * by and Copyright (C) 1997 Anonymous Coders and
14 * Junkbusters Corporation. http://www.junkbusters.com
16 * This program is free software; you can redistribute it
17 * and/or modify it under the terms of the GNU General
18 * Public License as published by the Free Software
19 * Foundation; either version 2 of the License, or (at
20 * your option) any later version.
22 * This program is distributed in the hope that it will
23 * be useful, but WITHOUT ANY WARRANTY; without even the
24 * implied warranty of MERCHANTABILITY or FITNESS FOR A
25 * PARTICULAR PURPOSE. See the GNU General Public
26 * License for more details.
28 * The GNU General Public License should be included with
29 * this file. If not, you can view it at
30 * http://www.gnu.org/copyleft/gpl.html
31 * or write to the Free Software Foundation, Inc., 59
32 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
37 * Fix byte_count calculation in case of flushes
38 * and don't parse the server headers a second time.
40 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
41 * - If there's a connection problem after we already forwarded
42 * parts of the original content, just hang up. Fixes BR#1776724.
43 * - Fix warnings about unused code on mingw32.
44 * - In case of flushes, calculate the byte count
45 * less incorrectly (I think).
47 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
48 * Add some more prototypes for static functions.
50 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
51 * Comment out request_contains_null_bytes() until it's used again.
53 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
54 * #1763173 from Stefan Huehner: s@const static@static const@
55 * and declare some more functions static.
57 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
58 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
59 * and explain why they were rejected in the first place.
60 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
61 * CONNECT requests. The request line was missing.
62 * - Add two more XXX reminders as we don't have enough already.
64 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
65 * As Hal noticed, checking dispatch_cgi() as the last cruncher
66 * looks like a bug if CGI requests are blocked unintentionally,
67 * so don't do it unless the user enabled the new config option
68 * "allow-cgi-request-crunching".
70 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
71 * - Allow to rewrite the request destination behind the client's back.
72 * - Turn the weird-looking unconditional for loop that
73 * reads the client request into a conditional while loop.
74 * Move the stuff that only runs once out of the loop.
75 * - Move parts of chat(), server_content_type() and the
76 * necessary stuff to fix BR#1750917 into get_filter_function().
78 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
79 * Temporary workaround for BR#1730105.
81 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
82 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
83 * deadlocks and crashes on OpenBSD and possibly other OS with neither
84 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
85 * Thanks to Ralf Horstmann for report and solution.
87 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
88 * Add forward-override{} to change the forwarding settings through
89 * action sections. This is mainly interesting to forward different
90 * clients differently (for example based on User-Agent or request
93 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
94 * - Let usage() mention the --chroot parameter.
95 * - Use read_socket() consistently and always leave
96 * the last buffer byte alone, even in cases where
97 * null termination (currently) doesn't matter.
99 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
100 * - Fix config file loading on Unix if no config file is specified.
101 * Since r1.97 Privoxy would always interpret the last argument as
102 * config file, even if it's a valid command line option.
103 * - Abort in case of unrecognized command line options. Closes #1719696.
104 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
105 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
107 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
108 * - Don't rerun crunchers that only depend on the request URL.
109 * - Don't count redirects and CGI requests as "blocked requests".
111 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
112 * Support crunching based on tags created by server-header taggers.
114 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
115 * Make HTTP snippets static (again). Add a Content-Type for those
116 * with content so the browser doesn't guess it based on the URL.
118 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
119 * Move crunching and request line rebuilding out of chat().
121 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
122 * Introduce tags as alternative way to specify which
123 * actions apply to a request. At the moment tags can be
124 * created based on client and server headers.
126 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
127 * Don't CLF-log CONNECT requests twice.
129 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
130 * Log the source address for ACL-related connection drops.
132 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
133 * New config option: enforce-blocks.
135 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
136 * - Move null byte check into separate function.
137 * - Don't confuse the client with error pages
138 * if a CONNECT request was already confirmed.
140 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
141 * Speed up NULL byte escaping and only log the complete
142 * NULL byte requests with header debugging enabled.
144 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
145 * Answer requests that contain NULL bytes with
146 * a custom response instead of waiting for more
147 * data until the client eventually hangs up.
149 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
150 * - Move delivery and logging of crunched responses
151 * from chat() into send_crunch_response().
152 * - Display the reason for generating http_responses.
153 * - Log the content length for LOG_LEVEL_CLF correctly
154 * (still incorrect for some fixed responses).
155 * - Reword an incorrect comment about
156 * treat-forbidden-connects-like-blocks violating
158 * - Add some log messages.
160 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
161 * Move mutex initialization into separate
162 * function and exit in case of errors.
164 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
165 * - Start to reduce chat()'s line count and move
166 * parts of it into separate functions.
167 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
169 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
170 * - Add Proxy-Agent header to HTTP snippets that are
171 * supposed to reach HTTP clients only.
172 * - Made a few CONNECT log messages more descriptive.
173 * - Catch completely empty server responses (as seen
174 * with Tor's fake ".noconnect" top level domain).
175 * - Use shiny new "forwarding-failed" template for socks errors.
177 * Revision 1.118 2007/01/07 07:43:43 joergs
178 * AmigaOS4 support added.
180 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
181 * Added config option accept-intercepted-requests
182 * and disabled it by default.
184 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
185 * Reverted parts of my last commit
186 * to keep error handling working.
188 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
189 * Fixed gcc43 conversion warnings.
191 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
192 * Fix -pedantic ISO C warning about converting
193 * from function pointer to object pointer.
195 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
196 * Silence compiler warning I introduced with my last commit.
198 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
199 * Mutex protect rand() if POSIX threading
200 * is used, warn the user if that's not possible
201 * and stop using it on _WIN32 where it could
204 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
205 * Don't prevent core dumps by catching SIGABRT.
206 * It's rude and makes debugging unreasonable painful.
208 * Revision 1.110 2006/12/13 14:52:53 etresoft
209 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
211 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
212 * Privoxy is now able to run as intercepting
213 * proxy in combination with any packet filter
214 * that does the port redirection. The destination
215 * is extracted from the "Host:" header which
216 * should be available for nearly all requests.
218 * Moved HTTP snipplets into jcc.c.
219 * Added error message for gopher proxy requests.
221 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
222 * Only unlink the pidfile if it's actually used.
224 * Change order of interception checks to make
225 * it possible to block or redirect requests for
228 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
229 * Make pthread mutex locking more generic. Instead of
230 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
231 * and use mutex locking unless there is an _r function
232 * available. Better safe than sorry.
234 * Fixes "./configure --disable-pthread" and should result
235 * in less threading-related problems on pthread-using platforms,
236 * but it still doesn't fix BR#1122404.
238 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
239 * Move pthread.h inclusion from jcc.c to jcc.h.
240 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
242 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
243 * Don't exit after receiving the second SIGHUP on Solaris.
245 * Fixes BR 1052235, but the same problem may exist on other
246 * systems. Once 3.0.6 is out we should use sigset()
247 * where available and see if it breaks anything.
249 * Revision 1.104 2006/09/23 13:26:38 roro
250 * Replace TABs by spaces in source code.
252 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
253 * Fix +redirect{}. Didn't work with -fast-redirects.
255 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
256 * Respond with 400 and a short text message
257 * if the client tries to use Privoxy as FTP proxy.
259 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
260 * Make number of retries in case of forwarded-connect problems
261 * a config file option (forwarded-connect-retries) and use 0 as
264 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
265 * Set random(3) seed.
267 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
268 * Follow the OpenBSD port's lead and protect the resolve
269 * functions on OpenBSD as well.
271 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
272 * --user fix. Only use the user as group if no group is specified.
273 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
275 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
276 * Windows service (re-)integration
280 * --install[:service_name]
281 * --uninstall[:service_name]
284 * They work as follows:
285 * --install will create a service for you and then terminate.
286 * By default the service name will be "privoxy" (without the quotes).
287 * However you can run multiple services if you wish, just by adding
288 * a colon and then a name (no spaces).
290 * --uninstall follows the exact same rules a --install.
292 * --service is used when the program is executed by the service
293 * control manager, and in normal circumstances would never be
294 * used as a command line argument.
296 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
297 * Windows service integration
299 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
300 * Incorporate Fabian Keil's patch work:
301 http://www.fabiankeil.de/sourcecode/privoxy/
303 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
304 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
305 * with what was really the latest development (the v_3_0_branch branch)
307 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
308 * Thanks to Jindrich Makovicka for a race condition fix for the log
309 * file. The race condition remains for non-pthread implementations.
310 * Reference patch #1175720.
312 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
313 * Add the ability to check jpeg images for invalid
314 * lengths of comment blocks. Defensive strategy
315 * against the exploit:
316 * Microsoft Security Bulletin MS04-028
317 * Buffer Overrun in JPEG Processing (GDI+) Could
318 * Allow Code Execution (833987)
319 * Enabled with +inspect-jpegs in actions files.
321 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
322 * - Fixed usage info for non-unix platforms
323 * - Fixed small cmdline parsing bug
325 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
326 * Diagnostics: Now preserve the returncode of pthread_create
327 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
329 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
330 * No longer ignore SIGCHLD. Fixes bug #769381
332 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
333 * Close jarfile on graceful exit, remove stray line
335 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
336 * Cosmetics: Killed a warning, a typo and an allocation left at exit
338 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
339 * No longer rely on non-POSIX.1 extensions of getcwd().
342 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
343 * Replaced setenv() by posix-compliant putenv()
344 * Thanks to Neil McCalden (nmcc AT users.sf.net).
346 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
347 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
349 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
350 * Clean-up and extension of improvements for forked mode:
351 * - Child's return code now consists of flags RC_FLAG_*
352 * - Reporting toggle to parent now properly #ifdef'ed
353 * - Children now report blocking to parent. This enables
354 * statistics in forked mode
356 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
357 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
358 * Children now report having been toggled through _exit(17), parents
359 * watch for that code and toggle themselves if found.
361 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
362 * Wrapping all *_r functions (the non-_r versions of them) with
363 * mutex semaphores for OSX. Hopefully this will take care of all
364 * of those pesky crash reports.
366 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
367 * Fixed two mostly harmless mem leaks
369 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
370 * Fix: Head of global clients list now initialized to NULL
372 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
373 * Added basic support for OPTIONS and TRACE HTTP methods:
374 * - New interceptor direct_response() added in chat().
375 * - sed() moved to earlier in the process, so that the
376 * Host: header is evaluated before actions and forwarding
379 * Revision 1.92 2002/05/08 16:00:46 oes
380 * Chat's buffer handling:
381 * - Fixed bug with unchecked out-of-mem conditions
382 * while reading client request & server headers
383 * - No longer predict if the buffer limit will be exceeded
384 * in the next read -- check add_to_iob's new
385 * return code. If buffer couldn't be extended
386 * (policy or out-of-mem) while
387 * - reading from client: abort
388 * - reading server headers: send error page
389 * - buffering server body for filter: flush,
390 * and if that fails: send error page
392 * Revision 1.91 2002/04/08 20:35:58 swa
395 * Revision 1.90 2002/04/02 14:57:28 oes
396 * Made sending wafers independent of FEATURE_COOKIE_JAR
398 * Revision 1.89 2002/03/31 17:18:59 jongfoster
399 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
401 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
402 * More compiler warning message maintenance
404 * Revision 1.87 2002/03/26 22:29:54 swa
405 * we have a new homepage!
407 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
408 * Workaround for closing the jarfile before load_config() comes around again
410 * Revision 1.85 2002/03/24 15:23:33 jongfoster
413 * Revision 1.84 2002/03/24 13:25:43 swa
414 * name change related issues
416 * Revision 1.83 2002/03/16 23:54:06 jongfoster
417 * Adding graceful termination feature, to help look for memory leaks.
418 * If you enable this (which, by design, has to be done by hand
419 * editing config.h) and then go to http://i.j.b/die, then the program
420 * will exit cleanly after the *next* request. It should free all the
421 * memory that was used.
423 * Revision 1.82 2002/03/13 00:27:05 jongfoster
426 * Revision 1.81 2002/03/12 01:42:50 oes
427 * Introduced modular filters
429 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
430 * OS/2 port maintenance:
431 * - Fixed EMX build - it had decayed a little
432 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
433 * substituted a memset for now.
435 * Revision 1.79 2002/03/09 20:03:52 jongfoster
436 * - Making various functions return int rather than size_t.
437 * (Undoing a recent change). Since size_t is unsigned on
438 * Windows, functions like read_socket that return -1 on
439 * error cannot return a size_t.
441 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
442 * crashes, and also frequently caused JB to jump to 100%
443 * CPU and stay there. (Because it thought it had just
444 * read ((unsigned)-1) == 4Gb of data...)
446 * - The signature of write_socket has changed, it now simply
447 * returns success=0/failure=nonzero.
449 * - Trying to get rid of a few warnings --with-debug on
450 * Windows, I've introduced a new type "jb_socket". This is
451 * used for the socket file descriptors. On Windows, this
452 * is SOCKET (a typedef for unsigned). Everywhere else, it's
453 * an int. The error value can't be -1 any more, so it's
454 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
455 * Windows it maps to the #define INVALID_SOCKET.)
457 * - The signature of bind_port has changed.
459 * Revision 1.78 2002/03/08 21:35:04 oes
460 * Added optional group supplement to --user option. Will now use default group of user if no group given
462 * Revision 1.77 2002/03/07 03:52:06 oes
463 * - Fixed compiler warnings etc
464 * - Improved handling of failed DNS lookups
466 * Revision 1.76 2002/03/06 22:54:35 jongfoster
467 * Automated function-comment nitpicking.
469 * Revision 1.75 2002/03/06 10:02:19 oes
470 * Fixed stupid bug when --user was not given
472 * Revision 1.74 2002/03/06 00:49:31 jongfoster
473 * Fixing warning on Windows
474 * Making #ifdefs that refer to the same variable consistently
475 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
477 * Revision 1.73 2002/03/05 23:57:30 hal9
478 * Stray character 's' on line 1618 was breaking build.
480 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
481 * - Re-enable OS/2 building after new parms were added
482 * - Fix false out of memory report when resolving CGI templates when no IP
483 * address is available of failed attempt (a la no such domain)
485 * Revision 1.71 2002/03/05 18:13:56 oes
486 * Added --user option
488 * Revision 1.70 2002/03/05 04:52:42 oes
489 * Deleted non-errlog debugging code
491 * Revision 1.69 2002/03/04 23:50:00 jongfoster
492 * Splitting off bind_port() call into bind_port_helper(), with
495 * Revision 1.68 2002/03/04 20:17:32 oes
498 * Revision 1.67 2002/03/04 18:18:57 oes
499 * - Removed _DEBUG mode
500 * - Cleand up cmdline parsing
501 * - Introduced --no-daemon, --pidfile options
502 * - Cleaned up signal handling:
503 * - Terminate cleanly on INT, TERM and ABRT
504 * - Schedule logfile for re-opening on HUP
505 * - Ignore CHLD and PIPE
506 * - Leave the rest with their default handlers
507 * - Uniform handler registration
508 * - Added usage() function
509 * - Played styleguide police
511 * Revision 1.66 2002/03/03 15:06:55 oes
512 * Re-enabled automatic config reloading
514 * Revision 1.65 2002/03/03 14:49:11 oes
515 * Fixed CLF logging: Now uses client's original HTTP request
517 * Revision 1.64 2002/03/03 09:18:03 joergs
518 * Made jumbjuster work on AmigaOS again.
520 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
521 * Clean up a little CRLF unpleasantness that suddenly appeared
523 * Revision 1.62 2002/02/20 23:17:23 jongfoster
524 * Detecting some out-of memory conditions and exiting with a log message.
526 * Revision 1.61 2002/01/17 21:01:52 jongfoster
527 * Moving all our URL and URL pattern parsing code to urlmatch.c.
529 * Revision 1.60 2001/12/30 14:07:32 steudten
530 * - Add signal handling (unix)
531 * - Add SIGHUP handler (unix)
532 * - Add creation of pidfile (unix)
533 * - Add action 'top' in rc file (RH)
534 * - Add entry 'SIGNALS' to manpage
535 * - Add exit message to logfile (unix)
537 * Revision 1.59 2001/12/13 14:07:18 oes
538 * Fixed Bug: 503 error page now sent OK
540 * Revision 1.58 2001/11/30 23:37:24 jongfoster
541 * Renaming the Win32 config file to config.txt - this is almost the
542 * same as the corresponding UNIX name "config"
544 * Revision 1.57 2001/11/16 00:47:43 jongfoster
545 * Changing the tty-disconnection code to use setsid().
547 * Revision 1.56 2001/11/13 20:20:54 jongfoster
548 * Tabs->spaces, fixing a bug with missing {} around an if()
550 * Revision 1.55 2001/11/13 20:14:53 jongfoster
551 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
553 * Revision 1.54 2001/11/07 00:03:14 steudten
554 * Give reliable return value if an error
555 * occurs not just 0 with new daemon mode.
557 * Revision 1.53 2001/11/05 21:41:43 steudten
558 * Add changes to be a real daemon just for unix os.
559 * (change cwd to /, detach from controlling tty, set
560 * process group and session leader to the own process.
562 * Add some fatal-error log message for failed malloc().
563 * Add '-d' if compiled with 'configure --with-debug' to
564 * enable debug output.
566 * Revision 1.52 2001/10/26 20:11:20 jongfoster
567 * Fixing type mismatch
569 * Revision 1.51 2001/10/26 17:38:28 oes
572 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
573 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
574 * threads to call select() simultaneously. So, it's time to do a real, live,
575 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
576 * (native). Both versions will work, but using __OS2__ offers multi-threading.
578 * Revision 1.49 2001/10/23 21:41:35 jongfoster
579 * Added call to initialize the (statically-allocated of course)
580 * "out of memory" CGI response.
582 * Revision 1.48 2001/10/10 19:56:46 jongfoster
583 * Moving some code that wasn't cookie-related out of an #ifdef
586 * Revision 1.47 2001/10/10 16:44:36 oes
587 * Added CONNECT destination port limitation check
589 * Revision 1.46 2001/10/08 15:17:41 oes
590 * Re-enabled SSL forwarding
592 * Revision 1.45 2001/10/07 15:42:11 oes
593 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
595 * Moved downgrading of the HTTP version from parse_http_request to
596 * chat(), since we can't decide if it is necessary before we have
597 * determined the actions for the URL. The HTTP command is now
598 * *always* re-built so the repairs need no longer be special-cased.
600 * filter_popups now gets a csp pointer so it can raise the new
601 * CSP_FLAG_MODIFIED flag.
605 * Added configurable size limit for the IOB. If the IOB grows so
606 * large that the next read would exceed the limit, the header
607 * is generated, and the header & unfiltered buffer are flushed
608 * to the client. Chat then continues in non-buffering,
609 * non-filtering body mode.
611 * Revision 1.44 2001/10/02 18:13:57 oes
614 * Revision 1.43 2001/10/02 15:32:13 oes
615 * Moved generation of hdr
617 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
618 * Cleaning up 2 compiler warnings on OS/2.
620 * Revision 1.41 2001/09/16 17:05:14 jongfoster
621 * Removing unused #include showarg.h
623 * Revision 1.40 2001/09/16 15:41:45 jongfoster
624 * Fixing signed/unsigned comparison warning.
626 * Revision 1.39 2001/09/16 13:21:27 jongfoster
627 * Changes to use new list functions.
629 * Revision 1.38 2001/09/16 13:01:46 jongfoster
630 * Removing redundant function call that zeroed zalloc()'d memory.
632 * Revision 1.37 2001/09/10 11:12:24 oes
633 * Deleted unused variable
635 * Revision 1.36 2001/09/10 10:56:15 oes
636 * Silenced compiler warnings
638 * Revision 1.35 2001/07/31 14:44:22 oes
639 * Deleted unused size parameter from filter_popups()
641 * Revision 1.34 2001/07/30 22:08:36 jongfoster
642 * Tidying up #defines:
643 * - All feature #defines are now of the form FEATURE_xxx
644 * - Permanently turned off WIN_GUI_EDIT
645 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
647 * Revision 1.33 2001/07/29 19:32:00 jongfoster
648 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
650 * Revision 1.32 2001/07/29 18:47:05 jongfoster
651 * Adding missing #include "loadcfg.h"
653 * Revision 1.31 2001/07/29 12:17:48 oes
654 * Applied pthread fix by Paul Lieverse
656 * Revision 1.30 2001/07/25 22:57:13 jongfoster
657 * __BEOS__ no longer overrides FEATURE_PTHREAD.
658 * This is because FEATURE_PTHREAD will soon be widely used, so I
659 * want to keep it simple.
661 * Revision 1.29 2001/07/24 12:47:06 oes
662 * Applied BeOS support update by Eugenia
664 * Revision 1.28 2001/07/23 13:26:12 oes
665 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
667 * Revision 1.27 2001/07/19 19:09:47 haroon
668 * - Added code to take care of the situation where while processing the first
669 * server response (which includes the server header), after finding the end
670 * of the headers we were not looking past the end of the headers for
671 * content modification. I enabled it for filter_popups.
672 * Someone else should look to see if other similar operations should be
673 * done to the discarded portion of the buffer.
675 * Note 2001/07/20: No, the other content modification mechanisms will process
676 * the whole iob later anyway. --oes
678 * Revision 1.26 2001/07/18 12:31:36 oes
681 * Revision 1.25 2001/07/15 19:43:49 jongfoster
682 * Supports POSIX threads.
683 * Also removed some unused #includes.
685 * Revision 1.24 2001/07/13 14:00:40 oes
686 * - Generic content modification scheme:
687 * Each feature has its own applicability flag that is set
688 * from csp->action->flags.
689 * Replaced the "filtering" int flag , by a function pointer
690 * "content_filter" to the function that will do the content
691 * modification. If it is != NULL, the document will be buffered
692 * and processed through *content_filter, which must set
693 * csp->content_length and return a modified copy of the body
694 * or return NULL (on failiure).
695 * - Changed csp->is_text to the more generic bitmap csp->content_type
696 * which can currently take the valued CT_TEXT or CT_GIF
698 * - Removed all #ifdef PCRS
700 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
701 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
702 * the `block_acl' call. This prevents a compilation error when the user
703 * does not wish to use the "ACL" feature.
705 * Revision 1.22 2001/06/29 21:45:41 oes
706 * Indentation, CRLF->LF, Tab-> Space
708 * Revision 1.21 2001/06/29 13:29:36 oes
709 * - Cleaned up, improved comments
710 * - Unified all possible interceptors (CGI,
711 * block, trust, fast_redirect) in one
712 * place, with one (CGI) answer generation
713 * mechansim. Much clearer now.
714 * - Removed the GIF image generation, which
715 * is now done in filters.c:block_url()
716 * - Made error conditions like domain lookup
717 * failiure or (various) problems while talking
718 * to the server use cgi.c:error_response()
719 * instead of generating HTML/HTTP in chat() (yuck!)
720 * - Removed logentry from cancelled commit
722 * Revision 1.20 2001/06/09 10:55:28 jongfoster
723 * Changing BUFSIZ ==> BUFFER_SIZE
725 * Revision 1.19 2001/06/07 23:12:52 jongfoster
726 * Replacing function pointer in struct gateway with a directly
727 * called function forwarded_connect().
728 * Replacing struct gateway with struct forward_spec
730 * Revision 1.18 2001/06/03 19:12:16 oes
731 * introduced new cgi handling
733 * Revision 1.17 2001/06/01 20:07:23 jongfoster
734 * Now uses action +image-blocker{} rather than config->tinygif
736 * Revision 1.16 2001/06/01 18:49:17 jongfoster
737 * Replaced "list_share" with "list" - the tiny memory gain was not
738 * worth the extra complexity.
740 * Revision 1.15 2001/05/31 21:24:47 jongfoster
741 * Changed "permission" to "action" throughout.
742 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
743 * Moved vanilla wafer check into chat(), since we must now
744 * decide whether or not to add it based on the URL.
746 * Revision 1.14 2001/05/29 20:14:01 joergs
747 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
750 * Revision 1.13 2001/05/29 09:50:24 jongfoster
751 * Unified blocklist/imagelist/permissionslist.
752 * File format is still under discussion, but the internal changes
755 * Also modified interceptor behaviour:
756 * - We now intercept all URLs beginning with one of the following
757 * prefixes (and *only* these prefixes):
759 * * http://ijbswa.sf.net/config/
760 * * http://ijbswa.sourceforge.net/config/
761 * - New interceptors "home page" - go to http://i.j.b/ to see it.
762 * - Internal changes so that intercepted and fast redirect pages
763 * are not replaced with an image.
764 * - Interceptors now have the option to send a binary page direct
765 * to the client. (i.e. ijb-send-banner uses this)
766 * - Implemented show-url-info interceptor. (Which is why I needed
767 * the above interceptors changes - a typical URL is
768 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
769 * The previous mechanism would not have intercepted that, and
770 * if it had been intercepted then it then it would have replaced
773 * Revision 1.12 2001/05/27 22:17:04 oes
775 * - re_process_buffer no longer writes the modified buffer
776 * to the client, which was very ugly. It now returns the
777 * buffer, which it is then written by chat.
779 * - content_length now adjusts the Content-Length: header
780 * for modified documents rather than crunch()ing it.
781 * (Length info in csp->content_length, which is 0 for
782 * unmodified documents)
784 * - For this to work, sed() is called twice when filtering.
786 * Revision 1.11 2001/05/26 17:27:53 jongfoster
787 * Added support for CLF and fixed LOG_LEVEL_LOG.
788 * Also did CRLF->LF fix of my previous patch.
790 * Revision 1.10 2001/05/26 15:26:15 jongfoster
791 * ACL feature now provides more security by immediately dropping
792 * connections from untrusted hosts.
794 * Revision 1.9 2001/05/26 00:28:36 jongfoster
795 * Automatic reloading of config file.
796 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
797 * Most of the global variables have been moved to a new
798 * struct configuration_spec, accessed through csp->config->globalname
799 * Most of the globals remaining are used by the Win32 GUI.
801 * Revision 1.8 2001/05/25 22:43:18 jongfoster
802 * Fixing minor memory leak and buffer overflow.
804 * Revision 1.7 2001/05/25 22:34:30 jongfoster
807 * Revision 1.6 2001/05/23 00:13:58 joergs
808 * AmigaOS support fixed.
810 * Revision 1.5 2001/05/22 18:46:04 oes
812 * - Enabled filtering banners by size rather than URL
813 * by adding patterns that replace all standard banner
814 * sizes with the "Junkbuster" gif to the re_filterfile
816 * - Enabled filtering WebBugs by providing a pattern
817 * which kills all 1x1 images
819 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
820 * which is selected by the (nonstandard and therefore
821 * capital) letter 'U' in the option string.
822 * It causes the quantifiers to be ungreedy by default.
823 * Appending a ? turns back to greedy (!).
825 * - Added a new interceptor ijb-send-banner, which
826 * sends back the "Junkbuster" gif. Without imagelist or
827 * MSIE detection support, or if tinygif = 1, or the
828 * URL isn't recognized as an imageurl, a lame HTML
829 * explanation is sent instead.
831 * - Added new feature, which permits blocking remote
832 * script redirects and firing back a local redirect
834 * The feature is conditionally compiled, i.e. it
835 * can be disabled with --disable-fast-redirects,
836 * plus it must be activated by a "fast-redirects"
837 * line in the config file, has its own log level
838 * and of course wants to be displayed by show-proxy-args
839 * Note: Boy, all the #ifdefs in 1001 locations and
840 * all the fumbling with configure.in and acconfig.h
841 * were *way* more work than the feature itself :-(
843 * - Because a generic redirect template was needed for
844 * this, tinygif = 3 now uses the same.
846 * - Moved GIFs, and other static HTTP response templates
851 * - Removed some >400 CRs again (Jon, you really worked
854 * Revision 1.4 2001/05/21 19:34:01 jongfoster
855 * Made failure to bind() a fatal error.
857 * Revision 1.3 2001/05/20 01:21:20 jongfoster
858 * Version 2.9.4 checkin.
859 * - Merged popupfile and cookiefile, and added control over PCRS
860 * filtering, in new "permissionsfile".
861 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
862 * file error you now get a message box (in the Win32 GUI) rather
863 * than the program exiting with no explanation.
864 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
866 * - Removed tabs from "config"
867 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
868 * - Bumped up version number.
870 * Revision 1.2 2001/05/17 22:34:44 oes
871 * - Added hint on GIF char array generation to jcc.c
872 * - Cleaned CRLF's from the sources and related files
873 * - Repaired logging for REF and FRC
875 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
876 * Initial import of version 2.9.3 source tree
879 *********************************************************************/
885 #include <sys/types.h>
894 # ifndef FEATURE_PTHREAD
898 # include <windows.h>
899 # include <process.h>
900 # endif /* ndef FEATURE_PTHREAD */
903 # ifndef _WIN_CONSOLE
905 # endif /* ndef _WIN_CONSOLE */
906 # include "w32svrapi.h"
908 #else /* ifndef _WIN32 */
910 # if !defined (__OS2__)
912 # include <sys/wait.h>
913 # endif /* ndef __OS2__ */
914 # include <sys/time.h>
915 # include <sys/stat.h>
916 # include <sys/ioctl.h>
919 #include <sys/termios.h>
930 # include <socket.h> /* BeOS has select() for sockets only. */
931 # include <OS.h> /* declarations for threads and stuff. */
934 # if defined(__EMX__) || defined(__OS2__)
935 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
940 #define bzero(B,N) memset(B,0x00,n)
955 #include "killpopup.h"
956 #include "miscutil.h"
958 #include "jbsockets.h"
963 #include "urlmatch.h"
965 const char jcc_h_rcs[] = JCC_H_VERSION;
966 const char project_h_rcs[] = PROJECT_H_VERSION;
969 struct client_state clients[1];
970 struct file_list files[1];
972 #ifdef FEATURE_STATISTICS
973 int urls_read = 0; /* total nr of urls read inc rejected */
974 int urls_rejected = 0; /* total nr of urls rejected */
975 #endif /* def FEATURE_STATISTICS */
977 #ifdef FEATURE_GRACEFUL_TERMINATION
981 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
982 static void sig_handler(int the_signal);
984 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
985 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
986 static jb_err get_server_headers(struct client_state *csp);
987 static const char *crunch_reason(const struct http_response *rsp);
988 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
990 * static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len);
992 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
993 static jb_err change_request_destination(struct client_state *csp);
994 static void chat(struct client_state *csp);
995 static void serve(struct client_state *csp);
997 static void usage(const char *myname);
999 static void initialize_mutexes(void);
1000 static jb_socket bind_port_helper(struct configuration_spec *config);
1001 static void listen_loop(void);
1004 void serve(struct client_state *csp);
1005 #else /* ifndef AMIGA */
1006 static void serve(struct client_state *csp);
1007 #endif /* def AMIGA */
1010 static int32 server_thread(void *data);
1011 #endif /* def __BEOS__ */
1014 #define sleep(N) Sleep(((N) * 1000))
1018 #define sleep(N) DosSleep(((N) * 100))
1021 #ifdef FEATURE_PTHREAD
1022 pthread_mutex_t log_mutex;
1023 pthread_mutex_t log_init_mutex;
1025 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1026 pthread_mutex_t resolver_mutex;
1027 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1029 #ifndef HAVE_GMTIME_R
1030 pthread_mutex_t gmtime_mutex;
1031 #endif /* ndef HAVE_GMTIME_R */
1033 #ifndef HAVE_LOCALTIME_R
1034 pthread_mutex_t localtime_mutex;
1035 #endif /* ndef HAVE_GMTIME_R */
1038 pthread_mutex_t rand_mutex;
1039 #endif /* ndef HAVE_RANDOM */
1041 #endif /* FEATURE_PTHREAD */
1043 #if defined(unix) || defined(__EMX__)
1044 const char *basedir = NULL;
1045 const char *pidfile = NULL;
1046 int received_hup_signal = 0;
1047 #endif /* defined unix */
1049 /* The vanilla wafer. */
1050 static const char VANILLA_WAFER[] =
1051 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
1052 "Do_not_send_me_any_copyrighted_information_other_than_the_"
1053 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
1054 "In_particular_do_not_send_me_any_cookies_that_"
1055 "are_subject_to_a_claim_of_copyright_by_anybody._"
1056 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
1057 "(copyright_or_otherwise)_applying_to_any_cookie._";
1059 /* HTTP snipplets. */
1060 static const char CSUCCEED[] =
1061 "HTTP/1.0 200 Connection established\n"
1062 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1064 static const char CHEADER[] =
1065 "HTTP/1.0 400 Invalid header received from browser\r\n"
1066 "Proxy-Agent: Privoxy " VERSION "\r\n"
1067 "Content-Type: text/plain\r\n"
1068 "Connection: close\r\n\r\n"
1069 "Invalid header received from browser.\r\n";
1071 static const char CFORBIDDEN[] =
1072 "HTTP/1.0 403 Connection not allowable\r\n"
1073 "Proxy-Agent: Privoxy " VERSION "\r\n"
1074 "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
1075 "Connection: close\r\n\r\n";
1077 static const char FTP_RESPONSE[] =
1078 "HTTP/1.0 400 Invalid request received from browser\r\n"
1079 "Content-Type: text/plain\r\n"
1080 "Connection: close\r\n\r\n"
1081 "Invalid request. Privoxy doesn't support FTP.\r\n";
1083 static const char GOPHER_RESPONSE[] =
1084 "HTTP/1.0 400 Invalid request received from browser\r\n"
1085 "Content-Type: text/plain\r\n"
1086 "Connection: close\r\n\r\n"
1087 "Invalid request. Privoxy doesn't support gopher.\r\n";
1089 /* XXX: should be a template */
1090 static const char MISSING_DESTINATION_RESPONSE[] =
1091 "HTTP/1.0 400 Bad request received from browser\r\n"
1092 "Proxy-Agent: Privoxy " VERSION "\r\n"
1093 "Content-Type: text/plain\r\n"
1094 "Connection: close\r\n\r\n"
1095 "Bad request. Privoxy was unable to extract the destination.\r\n";
1097 /* XXX: should be a template */
1098 static const char NO_SERVER_DATA_RESPONSE[] =
1099 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1100 "Proxy-Agent: Privoxy " VERSION "\r\n"
1101 "Content-Type: text/plain\r\n"
1102 "Connection: close\r\n\r\n"
1103 "Empty server or forwarder response.\r\n"
1104 "The connection was closed without sending any data.\r\n";
1106 /* XXX: should be a template */
1107 static const char NULL_BYTE_RESPONSE[] =
1108 "HTTP/1.0 400 Bad request received from browser\r\n"
1109 "Proxy-Agent: Privoxy " VERSION "\r\n"
1110 "Content-Type: text/plain\r\n"
1111 "Connection: close\r\n\r\n"
1112 "Bad request. Null byte(s) before end of request.\r\n";
1114 /* XXX: should be a template */
1115 static const char MESSED_UP_REQUEST_RESPONSE[] =
1116 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1117 "Proxy-Agent: Privoxy " VERSION "\r\n"
1118 "Content-Type: text/plain\r\n"
1119 "Connection: close\r\n\r\n"
1120 "Bad request. Messed up with header filters.\r\n";
1122 /* A function to crunch a response */
1123 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1125 typedef char *(*filter_function_ptr)();
1127 /* Crunch function flags */
1128 #define CF_NO_FLAGS 0
1129 /* Cruncher applies to forced requests as well */
1130 #define CF_IGNORE_FORCE 1
1131 /* Crunched requests are counted for the block statistics */
1132 #define CF_COUNT_AS_REJECT 2
1134 /* A crunch function and its flags */
1137 const crunch_func_ptr cruncher;
1141 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1142 static filter_function_ptr get_filter_function(struct client_state *csp);
1144 /* Complete list of cruncher functions */
1145 static const struct cruncher crunchers_all[] = {
1146 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1147 { block_url, CF_COUNT_AS_REJECT },
1148 #ifdef FEATURE_TRUST
1149 { trust_url, CF_COUNT_AS_REJECT },
1150 #endif /* def FEATURE_TRUST */
1151 { redirect_url, CF_NO_FLAGS },
1152 { dispatch_cgi, CF_IGNORE_FORCE},
1156 /* Light version, used after tags are applied */
1157 static const struct cruncher crunchers_light[] = {
1158 { block_url, CF_COUNT_AS_REJECT },
1159 { redirect_url, CF_NO_FLAGS },
1164 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1165 /*********************************************************************
1167 * Function : sig_handler
1169 * Description : Signal handler for different signals.
1170 * Exit gracefully on TERM and INT
1171 * or set a flag that will cause the errlog
1172 * to be reopened by the main thread on HUP.
1175 * 1 : the_signal = the signal cause this function to call
1179 *********************************************************************/
1180 static void sig_handler(int the_signal)
1186 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1197 received_hup_signal = 1;
1202 * We shouldn't be here, unless we catch signals
1203 * in main() that we can't handle here!
1205 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1213 /*********************************************************************
1215 * Function : client_protocol_is_unsupported
1217 * Description : Checks if the client used a known unsupported
1218 * protocol and deals with it by sending an error
1222 * 1 : csp = Current client state (buffers, headers, etc...)
1223 * 2 : req = the first request line send by the client
1225 * Returns : TRUE if an error response has been generated, or
1226 * FALSE if the request doesn't look invalid.
1228 *********************************************************************/
1229 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1231 char buf[BUFFER_SIZE];
1234 * If it's a FTP or gopher request, we don't support it.
1236 * These checks are better than nothing, but they might
1237 * not work in all configurations and some clients might
1238 * have problems digesting the answer.
1240 * They should, however, never cause more problems than
1241 * Privoxy's old behaviour (returning the misleading HTML
1244 * "Could not resolve http://(ftp|gopher)://example.org").
1246 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1248 if (!strncmpic(req, "GET ftp://", 10))
1250 strlcpy(buf, FTP_RESPONSE, sizeof(buf));
1251 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
1252 csp->ip_addr_str, req);
1256 strlcpy(buf, GOPHER_RESPONSE, sizeof(buf));
1257 log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
1258 csp->ip_addr_str, req);
1260 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1262 write_socket(csp->cfd, buf, strlen(buf));
1271 /*********************************************************************
1273 * Function : get_request_destination_elsewhere
1275 * Description : If the client's request was redirected into
1276 * Privoxy without the client's knowledge,
1277 * the request line lacks the destination host.
1279 * This function tries to get it elsewhere,
1280 * provided accept-intercepted-requests is enabled.
1282 * "Elsewhere" currently only means "Host: header",
1283 * but in the future we may ask the redirecting
1284 * packet filter to look the destination up.
1286 * If the destination stays unknown, an error
1287 * response is send to the client and headers
1288 * are freed so that chat() can return directly.
1291 * 1 : csp = Current client state (buffers, headers, etc...)
1292 * 2 : headers = a header list
1294 * Returns : JB_ERR_OK if the destination is now known, or
1295 * JB_ERR_PARSE if it isn't.
1297 *********************************************************************/
1298 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1302 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1304 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1305 " Privoxy isn't configured to accept intercepted requests.",
1306 csp->ip_addr_str, csp->http->cmd);
1307 /* XXX: Use correct size */
1308 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1309 csp->ip_addr_str, csp->http->cmd);
1311 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1312 destroy_list(headers);
1314 return JB_ERR_PARSE;
1316 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1318 /* Split the domain we just got for pattern matching */
1319 init_domain_components(csp->http);
1325 /* We can't work without destination. Go spread the news.*/
1327 req = list_to_text(headers);
1329 /* XXX: Use correct size */
1330 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1331 csp->ip_addr_str, csp->http->cmd);
1332 log_error(LOG_LEVEL_ERROR,
1333 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1334 csp->ip_addr_str, csp->http->cmd, req);
1337 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1338 destroy_list(headers);
1340 return JB_ERR_PARSE;
1343 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1344 * to get the destination IP address, use it as host directly
1345 * or do a reverse DNS lookup first.
1350 /*********************************************************************
1352 * Function : get_server_headers
1354 * Description : Parses server headers in iob and fills them
1355 * into csp->headers so that they can later be
1359 * 1 : csp = Current client state (buffers, headers, etc...)
1361 * Returns : JB_ERR_OK if everything went fine, or
1362 * JB_ERR_PARSE if the headers were incomplete.
1364 *********************************************************************/
1365 static jb_err get_server_headers(struct client_state *csp)
1367 int continue_hack_in_da_house = 0;
1370 while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
1375 * continue hack in da house. Ignore the ending of
1376 * this head and continue enlisting header lines.
1377 * The reason is described below.
1379 enlist(csp->headers, "");
1380 continue_hack_in_da_house = 0;
1383 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1386 * It's a bodyless continue response, don't
1387 * stop header parsing after reaching it's end.
1389 * As a result Privoxy will concatenate the
1390 * next response's head and parse and deliver
1391 * the headers as if they belonged to one request.
1393 * The client will separate them because of the
1394 * empty line between them.
1396 * XXX: What we're doing here is clearly against
1397 * the intended purpose of the continue header,
1398 * and under some conditions (HTTP/1.0 client request)
1399 * it's a standard violation.
1401 * Anyway, "sort of against the spec" is preferable
1402 * to "always getting confused by Continue responses"
1403 * (Privoxy's behaviour before this hack was added)
1405 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1406 continue_hack_in_da_house = 1;
1408 else if (*header == '\0')
1411 * If the header is empty, but the Continue hack
1412 * isn't active, we can assume that we reached the
1413 * end of the buffer before we hit the end of the
1416 * Inform the caller an let it decide how to handle it.
1418 return JB_ERR_PARSE;
1422 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1425 * XXX: Should we quit the request and return a
1426 * out of memory error page instead?
1428 log_error(LOG_LEVEL_ERROR,
1429 "Out of memory while enlisting server headers. %s lost.",
1439 /*********************************************************************
1441 * Function : crunch_reason
1443 * Description : Translates the crunch reason code into a string.
1446 * 1 : rsp = a http_response
1448 * Returns : A string with the crunch reason or an error description.
1450 *********************************************************************/
1451 static const char *crunch_reason(const struct http_response *rsp)
1453 char * reason = NULL;
1455 assert(rsp != NULL);
1458 return "Internal error while searching for crunch reason";
1461 switch (rsp->reason)
1463 case RSP_REASON_UNSUPPORTED:
1464 reason = "Unsupported HTTP feature";
1466 case RSP_REASON_BLOCKED:
1469 case RSP_REASON_UNTRUSTED:
1470 reason = "Untrusted";
1472 case RSP_REASON_REDIRECTED:
1473 reason = "Redirected";
1475 case RSP_REASON_CGI_CALL:
1476 reason = "CGI Call";
1478 case RSP_REASON_NO_SUCH_DOMAIN:
1479 reason = "DNS failure";
1481 case RSP_REASON_FORWARDING_FAILED:
1482 reason = "Forwarding failed";
1484 case RSP_REASON_CONNECT_FAILED:
1485 reason = "Connection failure";
1487 case RSP_REASON_OUT_OF_MEMORY:
1488 reason = "Out of memory (may mask other reasons)";
1491 reason = "No reason recorded";
1499 /*********************************************************************
1501 * Function : send_crunch_response
1503 * Description : Delivers already prepared response for
1504 * intercepted requests, logs the interception
1505 * and frees the response.
1508 * 1 : csp = Current client state (buffers, headers, etc...)
1509 * 1 : rsp = Fully prepared response. Will be freed on exit.
1511 * Returns : Nothing.
1513 *********************************************************************/
1514 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
1516 const struct http_request *http = csp->http;
1517 char status_code[4];
1519 assert(rsp != NULL);
1520 assert(rsp->head != NULL);
1525 * Not supposed to happen. If it does
1526 * anyway, treat it as an unknown error.
1528 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1529 /* return code doesn't matter */
1534 /* If rsp is still NULL, we have serious internal problems. */
1535 log_error(LOG_LEVEL_FATAL,
1536 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1540 * Extract the status code from the actual head
1541 * that was send to the client. It is the only
1542 * way to get it right for all requests, including
1543 * the fixed ones for out-of-memory problems.
1545 * A head starts like this: 'HTTP/1.1 200...'
1549 status_code[0] = rsp->head[9];
1550 status_code[1] = rsp->head[10];
1551 status_code[2] = rsp->head[11];
1552 status_code[3] = '\0';
1554 /* Write the answer to the client */
1555 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1556 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1558 /* There is nothing we can do about it. */
1559 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1562 /* Log that the request was crunched and why. */
1563 log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
1564 http->hostport, http->path, crunch_reason(rsp));
1565 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
1566 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1568 /* Clean up and return */
1569 if (cgi_error_memory() != rsp)
1571 free_http_response(rsp);
1578 /*********************************************************************
1580 * Function : request_contains_null_bytes
1582 * Description : Checks for NULL bytes in the request and sends
1583 * an error message to the client if any were found.
1585 * XXX: currently not used, see comment in chat().
1588 * 1 : csp = Current client state (buffers, headers, etc...)
1589 * 2 : buf = Data from the client's request to check.
1590 * 3 : len = The data length.
1592 * Returns : TRUE if the request contained one or more NULL bytes, or
1595 *********************************************************************/
1596 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1598 size_t c_len; /* Request lenght when treated as C string */
1600 c_len = strlen(buf);
1605 * Null byte(s) found. Log the request,
1606 * return an error response and hang up.
1608 size_t tmp_len = c_len;
1613 * Replace NULL byte(s) with '°' characters
1614 * so the request can be logged as string.
1615 * XXX: Is there a better replacement character?
1618 tmp_len += strlen(buf+tmp_len);
1619 } while (tmp_len < len);
1621 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1622 "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
1623 log_error(LOG_LEVEL_HEADER,
1624 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1626 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1628 /* XXX: Log correct size */
1629 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1639 /*********************************************************************
1641 * Function : crunch_response_triggered
1643 * Description : Checks if the request has to be crunched,
1644 * and delivers the crunch response if necessary.
1647 * 1 : csp = Current client state (buffers, headers, etc...)
1648 * 2 : crunchers = list of cruncher functions to run
1650 * Returns : TRUE if the request was answered with a crunch response
1653 *********************************************************************/
1654 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1656 struct http_response *rsp = NULL;
1657 const struct cruncher *c;
1660 * If CGI request crunching is disabled,
1661 * check the CGI dispatcher out of order to
1662 * prevent unintentional blocks or redirects.
1664 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
1665 && (NULL != (rsp = dispatch_cgi(csp))))
1667 /* Deliver, log and free the interception response. */
1668 send_crunch_response(csp, rsp);
1672 for (c = crunchers; c->cruncher != NULL; c++)
1675 * Check the cruncher if either Privoxy is toggled
1676 * on and the request isn't forced, or if the cruncher
1677 * applies to forced requests as well.
1679 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
1680 !(csp->flags & CSP_FLAG_FORCED)) ||
1681 (c->flags & CF_IGNORE_FORCE))
1683 rsp = c->cruncher(csp);
1686 /* Deliver, log and free the interception response. */
1687 send_crunch_response(csp, rsp);
1688 #ifdef FEATURE_STATISTICS
1689 if (c->flags & CF_COUNT_AS_REJECT)
1691 csp->flags |= CSP_FLAG_REJECTED;
1693 #endif /* def FEATURE_STATISTICS */
1704 /*********************************************************************
1706 * Function : build_request_line
1708 * Description : Builds the HTTP request line.
1710 * If a HTTP forwarder is used it expects the whole URL,
1711 * web servers only get the path.
1714 * 1 : csp = Current client state (buffers, headers, etc...)
1715 * 2 : fwd = The forwarding spec used for the request
1716 * XXX: Should use http->fwd instead.
1717 * 3 : request_line = The old request line which will be replaced.
1719 * Returns : Nothing. Terminates in case of memory problems.
1721 *********************************************************************/
1722 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
1724 struct http_request *http = csp->http;
1726 assert(http->ssl == 0);
1729 * Downgrade http version from 1.1 to 1.0
1730 * if +downgrade action applies.
1732 if ( (csp->action->flags & ACTION_DOWNGRADE)
1733 && (!strcmpic(http->ver, "HTTP/1.1")))
1736 http->ver = strdup("HTTP/1.0");
1738 if (http->ver == NULL)
1740 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
1745 * Rebuild the request line.
1747 freez(*request_line);
1748 *request_line = strdup(http->gpc);
1749 string_append(request_line, " ");
1751 if (fwd->forward_host)
1753 string_append(request_line, http->url);
1757 string_append(request_line, http->path);
1759 string_append(request_line, " ");
1760 string_append(request_line, http->ver);
1762 if (*request_line == NULL)
1764 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1766 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1770 /*********************************************************************
1772 * Function : change_request_destination
1774 * Description : Parse a (rewritten) request line and regenerate
1775 * the http request data.
1778 * 1 : csp = Current client state (buffers, headers, etc...)
1780 * Returns : Forwards the parse_http_request() return code.
1781 * Terminates in case of memory problems.
1783 *********************************************************************/
1784 static jb_err change_request_destination(struct client_state *csp)
1786 struct http_request *http = csp->http;
1789 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
1790 free_http_request(http);
1791 err = parse_http_request(csp->headers->first->str, http, csp);
1792 if (JB_ERR_OK != err)
1794 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1795 jb_err_to_string(err));
1797 http->ocmd = strdup(http->cmd); /* XXX: ocmd is a misleading name */
1798 if (http->ocmd == NULL)
1800 log_error(LOG_LEVEL_FATAL, "Out of memory copying rewritten HTTP request line");
1807 /*********************************************************************
1809 * Function : get_filter_function
1811 * Description : Decides which content filter function has
1812 * to be applied (if any).
1814 * XXX: Doesn't handle filter_popups()
1815 * because of the different prototype. Probably
1816 * we should ditch filter_popups() anyway, it's
1817 * even less reliable than popup blocking based
1821 * 1 : csp = Current client state (buffers, headers, etc...)
1823 * Returns : The content filter function to run, or
1824 * NULL if no content filter is active
1826 *********************************************************************/
1827 static filter_function_ptr get_filter_function(struct client_state *csp)
1829 filter_function_ptr filter_function = NULL;
1832 * Are we enabling text mode by force?
1834 if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
1837 * Do we really have to?
1839 if (csp->content_type & CT_TEXT)
1841 log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
1845 csp->content_type |= CT_TEXT;
1846 log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
1850 if (!(csp->content_type & CT_DECLARED))
1853 * The server didn't bother to declare a MIME-Type.
1854 * Assume it's text that can be filtered.
1856 * This also regulary happens with 304 responses,
1857 * therefore logging anything here would cause
1860 csp->content_type |= CT_TEXT;
1865 * Choose the applying filter function based on
1866 * the content type and action settings.
1868 if ((csp->content_type & CT_TEXT) &&
1869 (csp->rlist != NULL) &&
1870 (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
1872 filter_function = pcrs_filter_response;
1874 else if ((csp->content_type & CT_GIF) &&
1875 (csp->action->flags & ACTION_DEANIMATE))
1877 filter_function = gif_deanimate_response;
1879 else if ((csp->content_type & CT_JPEG) &&
1880 (csp->action->flags & ACTION_JPEG_INSPECT))
1882 filter_function = jpeg_inspect_response;
1885 return filter_function;
1888 /*********************************************************************
1892 * Description : Once a connection to the client has been accepted,
1893 * this function is called (via serve()) to handle the
1894 * main business of the communication. When this
1895 * function returns, the caller must close the client
1898 * FIXME: chat is nearly thousand lines long.
1902 * 1 : csp = Current client state (buffers, headers, etc...)
1904 * Returns : Nothing.
1906 *********************************************************************/
1907 static void chat(struct client_state *csp)
1909 char buf[BUFFER_SIZE];
1917 int ms_iis5_hack = 0;
1918 size_t byte_count = 0;
1919 int forwarded_connect_retries = 0;
1920 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1921 const struct forward_spec * fwd;
1922 struct http_request *http;
1923 int len; /* for buffer sizes (and negative error codes) */
1925 #ifdef FEATURE_KILL_POPUPS
1926 int block_popups_now = 0; /* bool, 1==currently blocking popups */
1927 #endif /* def FEATURE_KILL_POPUPS */
1929 /* Function that does the content filtering for the current request */
1930 filter_function_ptr content_filter = NULL;
1932 /* Skeleton for HTTP response, if we should intercept the request */
1933 struct http_response *rsp;
1935 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1936 struct list header_list;
1937 struct list *headers = &header_list;
1941 memset(buf, 0, sizeof(buf));
1944 * Read the client's request. Note that since we're not using select() we
1945 * could get blocked here if a client connected, then didn't say anything!
1950 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1952 if (len <= 0) break; /* error! */
1955 * If there is no memory left for buffering the
1956 * request, there is nothing we can do but hang up
1958 if (add_to_iob(csp, buf, len))
1963 req = get_header(csp);
1965 } while ((NULL != req) && ('\0' == *req));
1969 /* Request received. Validate and parse it. */
1973 * XXX: Temporary disabled to prevent problems
1974 * with POST requests whose bodies are allowed to
1975 * contain NULL bytes. BR#1730105.
1977 * The main purpose of this check is to properly
1978 * log stuff like BitTorrent traffic and other junk
1979 * that hits public proxies. It's not required for
1980 * Privoxy to functions as those requests are discarded
1983 * It probably should be rewritten to only check
1984 * the head of the request. Another option would
1985 * be to let all POST requests pass, although that
1986 * may not be good enough.
1988 if (request_contains_null_bytes(csp, buf, len))
1990 /* NULL bytes found and dealt with, just hang up. */
1995 /* Does the request line look invalid? */
1996 if (client_protocol_is_unsupported(csp, req))
1999 * Yes. The request has already been
2000 * answered with a error response, the buffers
2001 * were freed and we're done with chatting.
2006 #ifdef FEATURE_FORCE_LOAD
2008 * If this request contains the FORCE_PREFIX and blocks
2009 * aren't enforced, get rid of it and set the force flag.
2011 if (strstr(req, FORCE_PREFIX))
2013 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2015 log_error(LOG_LEVEL_FORCE,
2016 "Ignored force prefix in request: \"%s\".", req);
2020 strclean(req, FORCE_PREFIX);
2021 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2022 csp->flags |= CSP_FLAG_FORCED;
2026 #endif /* def FEATURE_FORCE_LOAD */
2027 err = parse_http_request(req, http, csp);
2028 if (JB_ERR_OK != err)
2030 log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", jb_err_to_string(err));
2036 if (http->cmd == NULL)
2038 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2039 /* XXX: Use correct size */
2040 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2041 log_error(LOG_LEVEL_ERROR, "Invalid header received from %s.", csp->ip_addr_str);
2043 free_http_request(http);
2047 /* grab the rest of the client's headers */
2051 if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
2053 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2056 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2061 * If there is no memory left for buffering the
2062 * request, there is nothing we can do but hang up
2064 if (add_to_iob(csp, buf, len))
2071 if (p == NULL) break;
2078 if (http->host == NULL)
2081 * If we still don't know the request destination,
2082 * the request is invalid or the client uses
2083 * Privoxy without its knowledge.
2085 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2088 * Our attempts to get the request destination
2089 * elsewhere failed or Privoxy is configured
2090 * to only accept proxy requests.
2092 * An error response has already been send
2093 * and we're done here.
2100 * Determine the actions for this URL
2102 #ifdef FEATURE_TOGGLE
2103 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2105 /* Most compatible set of actions (i.e. none) */
2106 init_current_action(csp->action);
2109 #endif /* ndef FEATURE_TOGGLE */
2111 url_actions(http, csp);
2115 * Save a copy of the original request for logging
2117 http->ocmd = strdup(http->cmd);
2119 if (http->ocmd == NULL)
2121 log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
2124 enlist(csp->headers, http->cmd);
2126 /* Append the previously read headers */
2127 list_append_list_unique(csp->headers, headers);
2128 destroy_list(headers);
2131 * If the user has not supplied any wafers, and the user has not
2132 * told us to suppress the vanilla wafer, then send the vanilla wafer.
2134 if (list_is_empty(csp->action->multi[ACTION_MULTI_WAFER])
2135 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
2137 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
2140 err = sed(client_patterns, add_client_headers, csp);
2141 if (JB_ERR_OK != err)
2143 assert(err == JB_ERR_PARSE);
2144 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers");
2146 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2148 /* Check request line for rewrites. */
2149 if ((NULL == csp->headers->first->str)
2150 || (strcmp(http->cmd, csp->headers->first->str) &&
2151 (JB_ERR_OK != change_request_destination(csp))))
2154 * A header filter broke the request line - bail out.
2156 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2157 /* XXX: Use correct size */
2158 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2159 log_error(LOG_LEVEL_ERROR, "Invalid request line after applying header filters.");
2161 free_http_request(http);
2165 /* decide how to route the HTTP request */
2166 if (NULL == (fwd = forward_url(http, csp)))
2168 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2169 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2172 /* build the http request to send to the server
2173 * we have to do one of the following:
2175 * create = use the original HTTP request to create a new
2176 * HTTP request that has either the path component
2177 * without the http://domainspec (w/path) or the
2178 * full orininal URL (w/url)
2179 * Note that the path and/or the HTTP version may
2180 * have been altered by now.
2182 * connect = Open a socket to the host:port of the server
2183 * and short-circuit server and client socket.
2185 * pass = Pass the request unchanged if forwarding a CONNECT
2186 * request to a parent proxy. Note that we'll be sending
2187 * the CFAIL message ourselves if connecting to the parent
2188 * fails, but we won't send a CSUCCEED message if it works,
2189 * since that would result in a double message (ours and the
2190 * parent's). After sending the request to the parent, we simply
2193 * here's the matrix:
2196 * +--------+--------+
2198 * 0 | create | connect|
2200 * Forwarding +--------+--------+
2202 * 1 | create | pass |
2204 * +--------+--------+
2209 * Check if a CONNECT request is allowable:
2210 * In the absence of a +limit-connect action, allow only port 443.
2211 * If there is an action, allow whatever matches the specificaton.
2215 if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
2216 || (csp->action->flags & ACTION_LIMIT_CONNECT
2217 && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
2219 if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
2222 * The response may confuse some clients,
2223 * but makes unblocking easier.
2225 * XXX: It seems to work with all major browsers,
2226 * so we should consider returning a body by default someday ...
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, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2232 csp->action->flags |= ACTION_BLOCK;
2237 write_socket(csp->cfd, CFORBIDDEN, strlen(CFORBIDDEN));
2238 log_error(LOG_LEVEL_INFO, "Request from %s denied. "
2239 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2240 csp->ip_addr_str, csp->action->string[ACTION_STRING_LIMIT_CONNECT],
2242 assert(NULL != csp->http->ocmd);
2243 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 403 0", csp->ip_addr_str, csp->http->ocmd);
2245 list_remove_all(csp->headers);
2247 * XXX: For consistency we might want to log a crunch message here.
2256 freez(csp->headers->first->str);
2257 build_request_line(csp, fwd, &csp->headers->first->str);
2260 hdr = list_to_text(csp->headers);
2263 /* FIXME Should handle error properly */
2264 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2268 * We have a request. Check if one of the crunchers wants it.
2270 if (crunch_response_triggered(csp, crunchers_all))
2273 * Yes. The client got the crunch response
2274 * and we are done here after cleaning up.
2277 list_remove_all(csp->headers);
2283 * The headers can't be removed earlier because
2284 * they were still needed for the referrer check
2285 * in case of CGI crunches.
2287 * XXX: Would it be worth to move the referrer check
2288 * into client_referrer() and set a flag if it's trusted?
2290 list_remove_all(csp->headers);
2292 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2294 if (fwd->forward_host)
2296 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2297 fwd->forward_host, fwd->forward_port, http->hostport);
2301 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2304 /* here we connect to the server, gateway, or the forwarder */
2306 while ( (csp->sfd = forwarded_connect(fwd, http, csp))
2307 && (errno == EINVAL) && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2309 log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
2310 forwarded_connect_retries, http->hostport);
2313 if (csp->sfd == JB_INVALID_SOCKET)
2315 if (fwd->type != SOCKS_NONE)
2318 rsp = error_response(csp, "forwarding-failed", errno);
2320 else if (errno == EINVAL)
2322 rsp = error_response(csp, "no-such-domain", errno);
2326 rsp = error_response(csp, "connect-failed", errno);
2327 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2332 /* Write the answer to the client */
2335 send_crunch_response(csp, rsp);
2342 if (fwd->forward_host || (http->ssl == 0))
2344 /* write the client's (modified) header to the server
2345 * (along with anything else that may be in the buffer)
2348 if (write_socket(csp->sfd, hdr, strlen(hdr))
2349 || (flush_socket(csp->sfd, csp) < 0))
2351 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
2354 rsp = error_response(csp, "connect-failed", errno);
2358 send_crunch_response(csp, rsp);
2368 * We're running an SSL tunnel and we're not forwarding,
2369 * so just send the "connect succeeded" message to the
2370 * client, flush the rest, and get out of the way.
2372 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2380 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2382 /* we're finished with the client's header */
2385 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
2387 /* pass data between the client and server
2388 * until one or the other shuts down the connection.
2397 * FD_ZERO here seems to point to an errant macro which crashes.
2398 * So do this by hand for now...
2400 memset(&rfds,0x00,sizeof(fd_set));
2404 FD_SET(csp->cfd, &rfds);
2405 FD_SET(csp->sfd, &rfds);
2407 n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
2411 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2415 /* this is the body of the browser's request
2416 * just read it and write it.
2419 if (FD_ISSET(csp->cfd, &rfds))
2421 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2425 break; /* "game over, man" */
2428 if (write_socket(csp->sfd, buf, (size_t)len))
2430 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2437 * The server wants to talk. It could be the header or the body.
2438 * If `hdr' is null, then it's the header otherwise it's the body.
2439 * FIXME: Does `hdr' really mean `host'? No.
2443 if (FD_ISSET(csp->sfd, &rfds))
2446 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2450 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2452 if (http->ssl && (fwd->forward_host == NULL))
2455 * Just hang up. We already confirmed the client's CONNECT
2456 * request with status code 200 and unencrypted content is
2457 * no longer welcome.
2459 log_error(LOG_LEVEL_ERROR,
2460 "CONNECT already confirmed. Unable to tell the client about the problem.");
2463 else if (byte_count)
2466 * Just hang up. We already transmitted the original headers
2467 * and parts of the original content and therefore missed the
2468 * chance to send an error message (without risking data corruption).
2470 * XXX: we could retry with a fancy range request here.
2472 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2473 "Unable to tell the client about the problem.");
2477 rsp = error_response(csp, "connect-failed", errno);
2481 send_crunch_response(csp, rsp);
2487 /* Add a trailing zero. This lets filter_popups
2488 * use string operations.
2492 #ifdef FEATURE_KILL_POPUPS
2493 /* Filter the popups on this read. */
2494 if (block_popups_now)
2496 filter_popups(buf, csp);
2498 #endif /* def FEATURE_KILL_POPUPS */
2500 /* Normally, this would indicate that we've read
2501 * as much as the server has sent us and we can
2502 * close the client connection. However, Microsoft
2503 * in its wisdom has released IIS/5 with a bug that
2504 * prevents it from sending the trailing \r\n in
2505 * a 302 redirect header (and possibly other headers).
2506 * To work around this if we've haven't parsed
2507 * a full header we'll append a trailing \r\n
2508 * and see if this now generates a valid one.
2510 * This hack shouldn't have any impacts. If we've
2511 * already transmitted the header or if this is a
2512 * SSL connection, then we won't bother with this
2513 * hack. So we only work on partially received
2514 * headers. If we append a \r\n and this still
2515 * doesn't generate a valid header, then we won't
2516 * transmit anything to the client.
2521 if (server_body || http->ssl)
2524 * If we have been buffering up the document,
2525 * now is the time to apply content modification
2526 * and send the result to the client.
2531 * If the content filter fails, use the original
2532 * buffer and length.
2533 * (see p != NULL ? p : csp->iob->cur below)
2535 if (NULL == (p = (*content_filter)(csp)))
2537 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2540 if (JB_ERR_OK != sed(server_patterns_light, NULL, csp))
2542 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2545 hdr = list_to_text(csp->headers);
2548 /* FIXME Should handle error properly */
2549 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2553 * Shouldn't happen because this was the second sed run
2554 * and tags are only created for the first one.
2556 assert(!crunch_response_triggered(csp, crunchers_all));
2558 if (write_socket(csp->cfd, hdr, strlen(hdr))
2559 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
2561 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2571 break; /* "game over, man" */
2575 * This is NOT the body, so
2576 * Let's pretend the server just sent us a blank line.
2578 snprintf(buf, sizeof(buf), "\r\n");
2579 len = (int)strlen(buf);
2582 * Now, let the normal header parsing algorithm below do its
2583 * job. If it fails, we'll exit instead of continuing.
2590 * If this is an SSL connection or we're in the body
2591 * of the server document, just write it to the client,
2592 * unless we need to buffer the body for later content-filtering
2595 if (server_body || http->ssl)
2600 * If there is no memory left for buffering the content, or the buffer limit
2601 * has been reached, switch to non-filtering mode, i.e. make & write the
2602 * header, flush the iob and buf, and get out of the way.
2604 if (add_to_iob(csp, buf, len))
2609 log_error(LOG_LEVEL_ERROR, "Flushing header and buffers. Stepping back from filtering.");
2611 hdr = list_to_text(csp->headers);
2615 * Memory is too tight to even generate the header.
2616 * Send our static "Out-of-memory" page.
2618 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2619 rsp = cgi_error_memory();
2620 send_crunch_response(csp, rsp);
2624 hdrlen = strlen(hdr);
2626 if (write_socket(csp->cfd, hdr, hdrlen)
2627 || ((flushed = flush_socket(csp->cfd, csp)) < 0)
2628 || (write_socket(csp->cfd, buf, (size_t)len)))
2630 log_error(LOG_LEVEL_CONNECT, "Flush header and buffers to client failed: %E");
2637 * Reset the byte_count to the amount of bytes
2638 * we just flushed. len will be added a few lines below,
2639 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2641 byte_count = (size_t)flushed;
2643 content_filter = NULL;
2649 if (write_socket(csp->cfd, buf, (size_t)len))
2651 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2655 byte_count += (size_t)len;
2660 /* we're still looking for the end of the
2661 * server's header ... (does that make header
2662 * parsing an "out of body experience" ?
2666 * buffer up the data we just read. If that fails,
2667 * there's little we can do but send our static
2668 * out-of-memory page.
2670 if (add_to_iob(csp, buf, len))
2672 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2673 rsp = cgi_error_memory();
2674 send_crunch_response(csp, rsp);
2679 /* Convert iob into something sed() can digest */
2680 if (JB_ERR_PARSE == get_server_headers(csp))
2684 /* Well, we tried our MS IIS/5
2685 * hack and it didn't work.
2686 * The header is incomplete
2687 * and there isn't anything
2688 * we can do about it.
2694 /* Since we have to wait for
2695 * more from the server before
2696 * we can parse the headers
2697 * we just continue here.
2703 /* Did we actually get anything? */
2704 if (NULL == csp->headers->first)
2706 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2707 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2708 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2709 free_http_request(http);
2713 /* we have now received the entire header.
2714 * filter it and send the result to the client
2716 if (JB_ERR_OK != sed(server_patterns, add_server_headers, csp))
2718 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2720 hdr = list_to_text(csp->headers);
2723 /* FIXME Should handle error properly */
2724 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2727 if (crunch_response_triggered(csp, crunchers_light))
2730 * One of the tags created by a server-header
2731 * tagger triggered a crunch. We already
2732 * delivered the crunch response to the client
2733 * and are done here after cleaning up.
2738 /* Buffer and pcrs filter this if appropriate. */
2740 if (!http->ssl) /* We talk plaintext */
2743 #ifdef FEATURE_KILL_POPUPS
2744 /* Start blocking popups if appropriate. */
2745 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
2746 (csp->action->flags & ACTION_NO_POPUPS) != 0) /* Policy allows */
2748 block_popups_now = 1;
2750 * Filter the part of the body that came in the same read
2751 * as the last headers:
2753 filter_popups(csp->iob->cur, csp);
2755 #endif /* def FEATURE_KILL_POPUPS */
2756 content_filter = get_filter_function(csp);
2759 * Only write if we're not buffering for content modification
2761 if (!content_filter)
2763 /* write the server's (modified) header to
2764 * the client (along with anything else that
2765 * may be in the buffer)
2768 if (write_socket(csp->cfd, hdr, strlen(hdr))
2769 || ((len = flush_socket(csp->cfd, csp)) < 0))
2771 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2773 /* the write failed, so don't bother
2774 * mentioning it to the client...
2775 * it probably can't hear us anyway.
2781 byte_count += (size_t)len;
2784 /* we're finished with the server's header */
2789 /* If this was a MS IIS/5 hack then it means
2790 * the server has already closed the
2791 * connection. Nothing more to read. Time
2802 return; /* huh? we should never get here */
2805 if (csp->content_length == 0)
2808 * If Privoxy didn't recalculate the
2809 * Content-Lenght, byte_count is still
2812 csp->content_length = byte_count;
2815 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
2816 csp->ip_addr_str, http->ocmd, csp->content_length);
2820 /*********************************************************************
2824 * Description : This is little more than chat. We only "serve" to
2825 * to close any socket that chat may have opened.
2828 * 1 : csp = Current client state (buffers, headers, etc...)
2832 *********************************************************************/
2834 void serve(struct client_state *csp)
2835 #else /* ifndef AMIGA */
2836 static void serve(struct client_state *csp)
2837 #endif /* def AMIGA */
2840 close_socket(csp->cfd);
2842 if (csp->sfd != JB_INVALID_SOCKET)
2844 close_socket(csp->sfd);
2847 csp->flags &= ~CSP_FLAG_ACTIVE;
2853 /*********************************************************************
2855 * Function : server_thread
2857 * Description : We only exist to call `serve' in a threaded environment.
2860 * 1 : data = Current client state (buffers, headers, etc...)
2862 * Returns : Always 0.
2864 *********************************************************************/
2865 static int32 server_thread(void *data)
2867 serve((struct client_state *) data);
2875 /*********************************************************************
2879 * Description : Print usage info & exit.
2881 * Parameters : Pointer to argv[0] for identifying ourselves
2885 *********************************************************************/
2886 static void usage(const char *myname)
2888 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2892 #endif /* defined(unix) */
2895 "[--no-daemon] [--pidfile pidfile] [--user user[.group]] "
2896 #endif /* defined(unix) */
2897 "[--version] [configfile]\n"
2898 "Aborting\n", myname);
2903 #endif /* defined(unix) */
2906 /*********************************************************************
2908 * Function : initialize_mutexes
2910 * Description : Prepares mutexes if mutex support is available.
2914 * Returns : Void, exits in case of errors.
2916 *********************************************************************/
2917 static void initialize_mutexes(void)
2921 #ifdef FEATURE_PTHREAD
2923 * Prepare global mutex semaphores
2925 err = pthread_mutex_init(&log_mutex, 0);
2927 if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
2930 * XXX: The assumptions below are a bit naive
2931 * and can cause locks that aren't necessary.
2933 * For example older FreeBSD versions (< 6.x?)
2934 * have no gethostbyname_r, but gethostbyname is
2937 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2938 if (!err) err = pthread_mutex_init(&resolver_mutex, 0);
2939 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2941 * XXX: should we use a single mutex for
2942 * localtime() and gmtime() as well?
2944 #ifndef HAVE_GMTIME_R
2945 if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
2946 #endif /* ndef HAVE_GMTIME_R */
2948 #ifndef HAVE_LOCALTIME_R
2949 if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
2950 #endif /* ndef HAVE_GMTIME_R */
2953 if (!err) err = pthread_mutex_init(&rand_mutex, 0);
2954 #endif /* ndef HAVE_RANDOM */
2955 #endif /* FEATURE_PTHREAD */
2958 * TODO: mutex support for mingw32 would be swell.
2963 printf("Fatal error. Mutex initialization failed: %s.\n",
2972 /*********************************************************************
2976 * Description : Load the config file and start the listen loop.
2977 * This function is a lot more *sane* with the `load_config'
2978 * and `listen_loop' functions; although it stills does
2979 * a *little* too much for my taste.
2982 * 1 : argc = Number of parameters (including $0).
2983 * 2 : argv = Array of (char *)'s to the parameters.
2985 * Returns : 1 if : can't open config file, unrecognized directive,
2986 * stats requested in multi-thread mode, can't open the
2987 * log file, can't open the jar file, listen port is invalid,
2988 * any load fails, and can't bind port.
2990 * Else main never returns, the process must be signaled
2991 * to terminate execution. Or, on Windows, use the
2992 * "File", "Exit" menu option.
2994 *********************************************************************/
2996 int real_main(int argc, const char *argv[])
2998 int main(int argc, const char *argv[])
3002 unsigned int random_seed;
3004 struct passwd *pw = NULL;
3005 struct group *grp = NULL;
3014 #if !defined(_WIN32)
3022 * Parse the command line arguments
3024 * XXX: simply printing usage information in case of
3025 * invalid arguments isn't particular user friendly.
3027 while (++argc_pos < argc)
3030 /* Check to see if the service must be installed or uninstalled */
3031 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3033 const char *pName = argv[argc_pos] + 9;
3036 exit( (install_service(pName)) ? 0 : 1 );
3038 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3040 const char *pName = argv[argc_pos] + 11;
3043 exit((uninstall_service(pName)) ? 0 : 1);
3045 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3047 bRunAsService = TRUE;
3048 w32_set_service_cwd();
3049 atexit(w32_service_exit_notify);
3052 #endif /* defined(_WIN32) */
3055 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3057 if (strcmp(argv[argc_pos], "--help") == 0)
3062 else if(strcmp(argv[argc_pos], "--version") == 0)
3064 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3070 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3075 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3077 if (++argc_pos == argc) usage(argv[0]);
3078 pidfile = strdup(argv[argc_pos]);
3081 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3083 if (++argc_pos == argc) usage(argv[argc_pos]);
3085 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3088 if (NULL == (grp = getgrnam(p)))
3090 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3094 if (NULL == (pw = getpwnam(argv[argc_pos])))
3096 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3099 if (p != NULL) *--p = '\0';
3102 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3106 #endif /* defined(unix) */
3108 else if (argc_pos + 1 != argc)
3111 * This is neither the last command line
3112 * option, nor was it recognized before,
3113 * therefore it must be invalid.
3119 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3121 configfile = argv[argc_pos];
3124 } /* -END- while (more arguments) */
3127 if ( *configfile != '/' )
3129 char cwd[BUFFER_SIZE];
3131 size_t abs_file_size;
3133 /* make config-filename absolute here */
3134 if (NULL == getcwd(cwd, sizeof(cwd)))
3136 perror("failed to get current working directory");
3141 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3142 basedir = strdup(cwd);
3144 if (NULL == basedir ||
3145 NULL == (abs_file = malloc(abs_file_size)))
3147 perror("malloc failed");
3150 strlcpy(abs_file, basedir, abs_file_size);
3151 strlcat(abs_file, "/", abs_file_size );
3152 strlcat(abs_file, configfile, abs_file_size);
3153 configfile = abs_file;
3155 #endif /* defined unix */
3159 clients->next = NULL;
3163 #elif defined(_WIN32)
3167 /* Prepare mutexes if supported and necessary. */
3168 initialize_mutexes();
3170 random_seed = (unsigned int)time(NULL);
3172 srandom(random_seed);
3175 #endif /* ifdef HAVE_RANDOM */
3178 * Unix signal handling
3180 * Catch the abort, interrupt and terminate signals for a graceful exit
3181 * Catch the hangup signal so the errlog can be reopened.
3182 * Ignore the broken pipe signals (FIXME: Why?)
3184 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3187 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3188 const int ignored_signals[] = { SIGPIPE, 0 };
3190 for (idx = 0; catched_signals[idx] != 0; idx++)
3192 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3193 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3195 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3196 #endif /* ifdef sun */
3198 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3202 for (idx = 0; ignored_signals[idx] != 0; idx++)
3204 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3206 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3211 #else /* ifdef _WIN32 */
3212 # ifdef _WIN_CONSOLE
3214 * We *are* in a windows console app.
3215 * Print a verbose messages about FAQ's and such
3217 printf("%s", win32_blurb);
3218 # endif /* def _WIN_CONSOLE */
3219 #endif /* def _WIN32 */
3222 /* Initialize the CGI subsystem */
3223 cgi_init_error_messages();
3226 * If runnig on unix and without the --nodaemon
3227 * option, become a daemon. I.e. fork, detach
3228 * from tty and get process group leadership
3241 if ( pid < 0 ) /* error */
3246 else if ( pid != 0 ) /* parent */
3251 * must check for errors
3252 * child died due to missing files aso
3255 wpid = waitpid( pid, &status, WNOHANG );
3264 /* Should be more portable, but not as well tested */
3269 #else /* ndef __FreeBSD__ */
3271 #endif /* ndef __FreeBSD__ */
3272 fd = open("/dev/tty", O_RDONLY);
3275 /* no error check here */
3276 ioctl( fd, TIOCNOTTY,0 );
3280 /* FIXME: should close stderr (fd 2) here too, but the test
3282 * and load config file is done in listen_loop() and puts
3283 * some messages on stderr there.
3290 } /* -END- if (!no_daemon) */
3293 * As soon as we have written the PID file, we can switch
3294 * to the user and group ID indicated by the --user option
3300 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3302 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3308 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3310 if (chroot(pw->pw_dir) < 0)
3312 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3316 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3319 if (setuid(pw->pw_uid))
3321 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3325 char putenv_dummy[64];
3327 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3328 if (putenv(putenv_dummy) != 0)
3330 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3333 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3334 if (putenv(putenv_dummy) != 0)
3336 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3342 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3345 #endif /* defined unix */
3348 /* This will be FALSE unless the command line specified --service
3352 /* Yup, so now we must attempt to establish a connection
3353 * with the service dispatcher. This will only work if this
3354 * process was launched by the service control manager to
3355 * actually run as a service. If this isn't the case, i've
3356 * known it take around 30 seconds or so for the call to return.
3359 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3360 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3362 /* Service has run, and at this point is now being stopped, so just return */
3367 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3369 /* An error occurred. Usually it's because --service was wrongly specified
3370 * and we were unable to connect to the Service Control Dispatcher because
3371 * it wasn't expecting us and is therefore not listening.
3373 * For now, just continue below to call the listen_loop function.
3376 #endif /* def _WIN32 */
3386 /*********************************************************************
3388 * Function : bind_port_helper
3390 * Description : Bind the listen port. Handles logging, and aborts
3394 * 1 : config = Privoxy configuration. Specifies port
3397 * Returns : Port that was opened.
3399 *********************************************************************/
3400 static jb_socket bind_port_helper(struct configuration_spec * config)
3405 if ( (config->haddr != NULL)
3406 && (config->haddr[0] == '1')
3407 && (config->haddr[1] == '2')
3408 && (config->haddr[2] == '7')
3409 && (config->haddr[3] == '.') )
3411 log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
3414 else if (config->haddr == NULL)
3416 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3421 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3422 config->hport, config->haddr);
3425 result = bind_port(config->haddr, config->hport, &bfd);
3432 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3433 "There may be another Privoxy or some other "
3434 "proxy running on port %d",
3435 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3436 config->hport, config->hport);
3439 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3440 "The hostname is not resolvable",
3441 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3444 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3445 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3448 /* shouldn't get here */
3449 return JB_INVALID_SOCKET;
3452 config->need_bind = 0;
3459 /* Without this simple workaround we get this compiler warning from _beginthread
3460 * warning C4028: formal parameter 1 different from declaration
3462 void w32_service_listen_loop(void *p)
3466 #endif /* def _WIN32 */
3469 /*********************************************************************
3471 * Function : listen_loop
3473 * Description : bind the listen port and enter a "FOREVER" listening loop.
3479 *********************************************************************/
3480 static void listen_loop(void)
3482 struct client_state *csp = NULL;
3484 struct configuration_spec * config;
3486 config = load_config();
3488 bfd = bind_port_helper(config);
3490 #ifdef FEATURE_GRACEFUL_TERMINATION
3491 while (!g_terminate)
3496 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3497 while (waitpid(-1, NULL, WNOHANG) > 0)
3499 /* zombie children */
3501 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3504 * Free data that was used by died threads
3510 * Re-open the errlog after HUP signal
3512 if (received_hup_signal)
3514 init_error_log(Argv[0], config->logfile, config->debug);
3515 received_hup_signal = 0;
3520 #ifdef FEATURE_COOKIE_JAR
3522 * Need a workaround here: we have to fclose() the jarfile, or we die because it's
3523 * already open. I think unload_configfile() is not being run, which should do
3524 * this work. Until that can get resolved, we'll use this workaround.
3528 if (csp->config->jar)
3530 fclose(csp->config->jar);
3531 csp->config->jar = NULL;
3533 #endif /* FEATURE_COOKIE_JAR */
3534 #endif /* __OS2__ */
3536 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3538 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3542 csp->flags |= CSP_FLAG_ACTIVE;
3543 csp->sfd = JB_INVALID_SOCKET;
3545 csp->config = config = load_config();
3547 if ( config->need_bind )
3550 * Since we were listening to the "old port", we will not see
3551 * a "listen" param change until the next IJB request. So, at
3552 * least 1 more request must be made for us to find the new
3553 * setting. I am simply closing the old socket and binding the
3556 * Which-ever is correct, we will serve 1 more page via the
3557 * old settings. This should probably be a "show-proxy-args"
3558 * request. This should not be a so common of an operation
3559 * that this will hurt people's feelings.
3564 bfd = bind_port_helper(config);
3567 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3569 if (!accept_connection(csp, bfd))
3571 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3584 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3587 #ifdef FEATURE_TOGGLE
3588 if (global_toggle_state)
3590 csp->flags |= CSP_FLAG_TOGGLED_ON;
3592 #endif /* def FEATURE_TOGGLE */
3594 if (run_loader(csp))
3596 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3597 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3601 if (block_acl(NULL,csp))
3603 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3604 close_socket(csp->cfd);
3608 #endif /* def FEATURE_ACL */
3610 /* add it to the list of clients */
3611 csp->next = clients->next;
3612 clients->next = csp;
3614 if (config->multi_threaded)
3618 /* this is a switch () statment in the C preprocessor - ugh */
3619 #undef SELECTED_ONE_OPTION
3621 /* Use Pthreads in preference to native code */
3622 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3623 #define SELECTED_ONE_OPTION
3625 pthread_t the_thread;
3626 pthread_attr_t attrs;
3628 pthread_attr_init(&attrs);
3629 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3630 errno = pthread_create(&the_thread, &attrs,
3631 (void * (*)(void *))serve, csp);
3632 child_id = errno ? -1 : 0;
3633 pthread_attr_destroy(&attrs);
3637 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3638 #define SELECTED_ONE_OPTION
3639 child_id = _beginthread(
3640 (void (*)(void *))serve,
3645 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3646 #define SELECTED_ONE_OPTION
3647 child_id = _beginthread(
3648 (void(* _Optlink)(void*))serve,
3654 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3655 #define SELECTED_ONE_OPTION
3657 thread_id tid = spawn_thread
3658 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3660 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3662 child_id = (int) tid;
3671 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3672 #define SELECTED_ONE_OPTION
3673 csp->cfd = ReleaseSocket(csp->cfd, -1);
3676 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3677 NP_Output, Output(),
3678 NP_CloseOutput, FALSE,
3679 NP_Name, (ULONG)"privoxy child",
3683 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3684 NP_Output, Output(),
3685 NP_CloseOutput, FALSE,
3686 NP_Name, (ULONG)"privoxy child",
3687 NP_StackSize, 200*1024,
3693 ((struct Task *)child_id)->tc_UserData = csp;
3694 Signal((struct Task *)child_id, SIGF_SINGLE);
3699 #if !defined(SELECTED_ONE_OPTION)
3702 /* This block is only needed when using fork().
3703 * When using threads, the server thread was
3704 * created and run by the call to _beginthread().
3706 if (child_id == 0) /* child */
3709 #ifdef FEATURE_TOGGLE
3710 int inherited_toggle_state = global_toggle_state;
3711 #endif /* def FEATURE_TOGGLE */
3716 * If we've been toggled or we've blocked the request, tell Mom
3719 #ifdef FEATURE_TOGGLE
3720 if (inherited_toggle_state != global_toggle_state)
3722 rc |= RC_FLAG_TOGGLED;
3724 #endif /* def FEATURE_TOGGLE */
3726 #ifdef FEATURE_STATISTICS
3727 if (csp->flags & CSP_FLAG_REJECTED)
3729 rc |= RC_FLAG_BLOCKED;
3731 #endif /* ndef FEATURE_STATISTICS */
3735 else if (child_id > 0) /* parent */
3737 /* in a fork()'d environment, the parent's
3738 * copy of the client socket and the CSP
3742 #if !defined(_WIN32) && !defined(__CYGWIN__)
3744 wait( &child_status );
3747 * Evaluate child's return code: If the child has
3748 * - been toggled, toggle ourselves
3749 * - blocked its request, bump up the stats counter
3752 #ifdef FEATURE_TOGGLE
3753 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3755 global_toggle_state = !global_toggle_state;
3757 #endif /* def FEATURE_TOGGLE */
3759 #ifdef FEATURE_STATISTICS
3761 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3765 #endif /* def FEATURE_STATISTICS */
3767 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3768 close_socket(csp->cfd);
3769 csp->flags &= ~CSP_FLAG_ACTIVE;
3773 #undef SELECTED_ONE_OPTION
3774 /* end of cpp switch () */
3776 if (child_id < 0) /* failed */
3778 char buf[BUFFER_SIZE];
3780 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
3782 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
3784 write_socket(csp->cfd, buf, strlen(buf));
3785 close_socket(csp->cfd);
3786 csp->flags &= ~CSP_FLAG_ACTIVE;
3797 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3799 /* Clean up. Aim: free all memory (no leaks) */
3800 #ifdef FEATURE_GRACEFUL_TERMINATION
3802 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3804 unload_current_config_file();
3805 unload_current_actions_file();
3806 unload_current_re_filterfile();
3807 #ifdef FEATURE_TRUST
3808 unload_current_trust_file();
3811 if (config->multi_threaded)
3818 } while ((clients->next != NULL) && (--i > 0));
3822 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3833 #ifdef FEATURE_COOKIE_JAR
3834 if (NULL != config->jar)
3836 fclose(config->jar);
3840 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3841 /* Cleanup - remove taskbar icon etc. */
3846 #endif /* FEATURE_GRACEFUL_TERMINATION */