1 const char jcc_rcs[] = "$Id: jcc.c,v 1.228 2009/03/06 20:30:13 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) 2001-2009 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 1.228 2009/03/06 20:30:13 fabiankeil
37 * Log unsigned values as such.
39 * Revision 1.227 2009/03/02 19:18:11 fabiankeil
40 * Streamline parse_http_request()'s prototype. As
41 * cparser pointed out it doesn't actually use csp.
43 * Revision 1.226 2009/03/01 18:28:24 fabiankeil
44 * Help clang understand that we aren't dereferencing
47 * Revision 1.225 2009/02/19 18:09:32 fabiankeil
48 * Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
51 * Revision 1.224 2009/02/14 15:32:04 fabiankeil
52 * Add the request URL to the timeout message in chat().
55 * Revision 1.223 2009/02/09 21:21:16 fabiankeil
56 * Now that init_log_module() is called earlier, call show_version()
57 * later on from main() directly so it doesn't get called for --help
60 * Revision 1.222 2009/02/08 12:56:51 fabiankeil
61 * Call initialize_mutexes() before init_log_module() again.
62 * Broken since r220, might be the cause of Lee's #2579448.
64 * Revision 1.221 2009/02/06 18:02:58 fabiankeil
65 * When dropping privileges, also give up membership in supplementary
66 * groups. Thanks to Matthias Drochner for reporting the problem,
67 * providing the initial patch and testing the final version.
69 * Revision 1.220 2009/02/04 18:29:07 fabiankeil
70 * Initialize the log module before parsing arguments.
71 * Thanks to Matthias Drochner for the report.
73 * Revision 1.219 2009/01/31 16:08:21 fabiankeil
74 * Remove redundant error check in receive_client_request().
76 * Revision 1.218 2009/01/31 12:25:54 fabiankeil
77 * Flatten indentation in receive_client_request().
79 * Revision 1.217 2009/01/07 19:50:09 fabiankeil
80 * - If the socket-timeout has been reached and the client
81 * hasn't received any data yet, send an explanation before
82 * closing the connection.
83 * - In get_request_line(), signal timeouts the right way.
85 * Revision 1.216 2008/12/24 22:13:11 ler762
86 * fix GCC 3.4.4 warning
88 * Revision 1.215 2008/12/24 17:06:19 fabiankeil
89 * Keep a thread around to timeout alive connections
90 * even if no new requests are coming in.
92 * Revision 1.214 2008/12/20 14:53:55 fabiankeil
93 * Add config option socket-timeout to control the time
94 * Privoxy waits for data to arrive on a socket. Useful
95 * in case of stale ssh tunnels or when fuzz-testing.
97 * Revision 1.213 2008/12/15 18:45:51 fabiankeil
98 * When logging crunches, log the whole URL, so one can easily
99 * differentiate between vanilla HTTP and CONNECT requests.
101 * Revision 1.212 2008/12/14 15:46:22 fabiankeil
102 * Give crunched requests their own log level.
104 * Revision 1.211 2008/12/06 10:05:03 fabiankeil
105 * Downgrade "Received x bytes while expecting y." message to
106 * LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
108 * Revision 1.210 2008/12/02 22:03:18 fabiankeil
109 * Don't miscalculate byte_count if we don't get all the
110 * server headers with one read_socket() call. With keep-alive
111 * support enabled, this caused delays until the server closed
114 * Revision 1.209 2008/11/27 09:44:04 fabiankeil
115 * Cosmetics for the last commit: Don't watch out for
116 * the last chunk if the content isn't chunk-encoded or
117 * if we already determined the content length previously.
119 * Revision 1.208 2008/11/26 18:24:17 fabiankeil
120 * Recognize that the server response is complete if the
121 * last chunk is read together with the server headers.
124 * Revision 1.207 2008/11/25 17:25:16 fabiankeil
125 * Don't convert the client-header list to text until we need to.
127 * Revision 1.206 2008/11/23 17:00:11 fabiankeil
128 * Some more chat() cosmetics.
130 * Revision 1.205 2008/11/16 12:43:49 fabiankeil
131 * Turn keep-alive support into a runtime feature
132 * that is disabled by setting keep-alive-timeout
133 * to a negative value.
135 * Revision 1.204 2008/11/06 19:42:17 fabiankeil
136 * Fix last-chunk detection hack to also apply
137 * if buf[] contains nothing but the last-chunk.
139 * Revision 1.203 2008/11/06 18:34:35 fabiankeil
140 * Factor receive_client_request() and
141 * parse_client_request() out of chat().
143 * Revision 1.202 2008/11/02 18:40:34 fabiankeil
144 * If we received a different amount of data than we expected,
145 * log a warning and make sure the server socket isn't reused.
147 * Revision 1.201 2008/11/02 16:48:20 fabiankeil
148 * Revert revision 1.195 and try again.
150 * Revision 1.200 2008/10/26 16:53:18 fabiankeil
153 * Revision 1.199 2008/10/26 15:36:10 fabiankeil
154 * Remove two debug messages with LOG_LEVEL_INFO.
156 * Revision 1.198 2008/10/22 15:19:55 fabiankeil
157 * Once More, With Feeling: if there is no logfile
158 * because the user didn't specify one, we shouldn't
159 * call init_error_log() after receiving SIGHUP either.
161 * Revision 1.197 2008/10/20 17:02:40 fabiankeil
162 * If SIGHUP is received while we aren't running in daemon
163 * mode, calling init_error_log() would be a mistake.
165 * Revision 1.196 2008/10/16 09:16:41 fabiankeil
166 * - Fix two gcc44 conversion warnings.
167 * - Don't bother logging the last five bytes
170 * Revision 1.195 2008/10/13 16:04:37 fabiankeil
171 * Make sure we don't try to reuse tainted server sockets.
173 * Revision 1.194 2008/10/12 18:35:18 fabiankeil
174 * The last commit was a bit too ambitious, apparently the content
175 * length adjustment is only necessary if we aren't buffering.
177 * Revision 1.193 2008/10/12 15:57:35 fabiankeil
178 * Fix content length calculation if we read headers
179 * and the start of the body at once. Now that we have
180 * FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
182 * Revision 1.192 2008/10/11 18:19:14 fabiankeil
183 * Even more chat() cosmetics.
185 * Revision 1.191 2008/10/11 18:00:14 fabiankeil
186 * Reformat some comments in chat().
188 * Revision 1.190 2008/10/11 14:58:00 fabiankeil
189 * In case of chunk-encoded content, stop reading if
190 * the buffer looks like it ends with the last chunk.
192 * Revision 1.189 2008/10/11 09:53:00 fabiankeil
193 * Let server_response_is_complete() deal properly with
194 * content that is neither buffered nor read all at once.
196 * Revision 1.188 2008/10/09 18:21:41 fabiankeil
197 * Flush work-in-progress changes to keep outgoing connections
198 * alive where possible. Incomplete and mostly #ifdef'd out.
200 * Revision 1.187 2008/09/07 12:35:05 fabiankeil
201 * Add mutex lock support for _WIN32.
203 * Revision 1.186 2008/09/04 08:13:58 fabiankeil
204 * Prepare for critical sections on Windows by adding a
205 * layer of indirection before the pthread mutex functions.
207 * Revision 1.185 2008/08/30 12:03:07 fabiankeil
208 * Remove FEATURE_COOKIE_JAR.
210 * Revision 1.184 2008/08/22 15:34:45 fabiankeil
211 * - Silence LLVM/Clang complaint.
212 * - Make received_hup_signal static.
213 * - Hide definitions for basedir, pidfile and received_hup_signal
214 * from __EMX__ as they only seem to be used in case of #ifdef unix.
216 * Revision 1.183 2008/08/21 07:09:35 fabiankeil
217 * Accept Shoutcast responses again. Problem reported
218 * and fix suggested by Stefan in #2062860.
220 * Revision 1.182 2008/06/27 11:13:56 fabiankeil
221 * Fix possible NULL-pointer dereference reported
222 * by din_a4 in #2003937. Pointy hat to me.
224 * Revision 1.181 2008/05/21 15:47:15 fabiankeil
225 * Streamline sed()'s prototype and declare
226 * the header parse and add structures static.
228 * Revision 1.180 2008/05/21 15:26:32 fabiankeil
229 * - Mark csp as immutable for send_crunch_response().
230 * - Fix comment spelling.
232 * Revision 1.179 2008/05/20 20:13:32 fabiankeil
233 * Factor update_server_headers() out of sed(), ditch the
234 * first_run hack and make server_patterns_light static.
236 * Revision 1.178 2008/05/10 13:23:38 fabiankeil
237 * Don't provide get_header() with the whole client state
238 * structure when it only needs access to csp->iob.
240 * Revision 1.177 2008/05/10 11:51:12 fabiankeil
241 * Make the "read the rest of the headers" loop a bit more readable.
243 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
244 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
245 * - Remove useless comment.
247 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
248 * Fix comment grammar.
250 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
251 * Remove the pointless buffer in client_protocol_is_unsupported().
253 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
254 * Least-effort fix for bug #1821930 (reported by Lee):
255 * If the response doesn't look like HTTP,
256 * tell the client and log the problem.
258 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
259 * Don't pass the whole csp structure to flush_socket()
260 * when it only needs a file descriptor and a buffer.
262 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
263 * Remove kill-popups action.
265 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
266 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
268 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
269 * Remove the treat-forbidden-connects-like-blocks action. We now
270 * use the "blocked" page for forbidden CONNECT requests by default.
272 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
273 * Also use shiny new connect_port_is_forbidden() in jcc.c.
275 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
276 * Rename url_actions() to get_url_actions() and let it
277 * use the standard parameter ordering.
279 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
280 * Let forward_url() use the standard parameter ordering
281 * and mark its second parameter immutable.
283 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
284 * Remove the "Listening ... for local connections only" log message.
285 * Whether or not remote connections are able to reach Privoxy is up
286 * to the operating system.
288 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
289 * Prevent the log messages for CONNECT requests to unacceptable
290 * ports from printing the limit-connect argument as [null] if
291 * limit-connect hasn't been explicitly enabled.
293 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
294 * Make sure all console-mode apps get a usage() instance
296 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
297 * Reword NO_SERVER_DATA_RESPONSE to make it harder
298 * to misunderstand what the message is all about.
300 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
301 * Unbreak trustfile which previously didn't work without
302 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
304 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
305 * Plug memory leak. Spotted by Valgrind, triggered by
306 * Privoxy-Regression-Test feeding proxyfuzz.py.
308 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
309 * In the HTTP snipplets, refer to the client as client.
311 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
312 * Emit a log message when activating the MS IIS5 hack.
314 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
315 * Log the "weak randomization factor" warning only
316 * once for mingw32 and provide some more details.
318 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
319 * Initialize log module after initializing mutexes, future
320 * deadlocks in that code should now work cross-platform.
322 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
323 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
324 * Reported by Bert van Leeuwen in BR#1818808.
326 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
327 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
329 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
330 * When in daemon mode, close stderr after the configuration file has been
331 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
333 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
334 * - Fix a crash when parsing invalid requests whose first header
335 * is rejected by get_header(). Regression (re?)introduced
336 * in r1.143 by yours truly.
337 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
338 * client_cookie_adder() to make sure send-vanilla-wafer can be
339 * controlled through tags (and thus regression-tested).
341 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
342 * - Move get_filter_function() from jcc.c to filters.c
343 * so the filter functions can be static.
344 * - Don't bother filtering body-less responses.
346 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
347 * Execute content filters through execute_content_filter().
349 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
350 * Initialize req to NULL to make sure it's defined if the
351 * first read_socket() call fails. Reported by icmp30.
353 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
354 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
355 * extensive comments moved to user manual.
357 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
358 * Don't crash if a broken header filter wiped out the request line.
360 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
361 * Fix byte_count calculation in case of flushes
362 * and don't parse the server headers a second time.
364 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
365 * - If there's a connection problem after we already forwarded
366 * parts of the original content, just hang up. Fixes BR#1776724.
367 * - Fix warnings about unused code on mingw32.
368 * - In case of flushes, calculate the byte count
369 * less incorrectly (I think).
371 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
372 * Add some more prototypes for static functions.
374 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
375 * Comment out request_contains_null_bytes() until it's used again.
377 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
378 * #1763173 from Stefan Huehner: s@const static@static const@
379 * and declare some more functions static.
381 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
382 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
383 * and explain why they were rejected in the first place.
384 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
385 * CONNECT requests. The request line was missing.
386 * - Add two more XXX reminders as we don't have enough already.
388 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
389 * As Hal noticed, checking dispatch_cgi() as the last cruncher
390 * looks like a bug if CGI requests are blocked unintentionally,
391 * so don't do it unless the user enabled the new config option
392 * "allow-cgi-request-crunching".
394 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
395 * - Allow to rewrite the request destination behind the client's back.
396 * - Turn the weird-looking unconditional for loop that
397 * reads the client request into a conditional while loop.
398 * Move the stuff that only runs once out of the loop.
399 * - Move parts of chat(), server_content_type() and the
400 * necessary stuff to fix BR#1750917 into get_filter_function().
402 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
403 * Temporary workaround for BR#1730105.
405 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
406 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
407 * deadlocks and crashes on OpenBSD and possibly other OS with neither
408 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
409 * Thanks to Ralf Horstmann for report and solution.
411 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
412 * Add forward-override{} to change the forwarding settings through
413 * action sections. This is mainly interesting to forward different
414 * clients differently (for example based on User-Agent or request
417 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
418 * - Let usage() mention the --chroot parameter.
419 * - Use read_socket() consistently and always leave
420 * the last buffer byte alone, even in cases where
421 * null termination (currently) doesn't matter.
423 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
424 * - Fix config file loading on Unix if no config file is specified.
425 * Since r1.97 Privoxy would always interpret the last argument as
426 * config file, even if it's a valid command line option.
427 * - Abort in case of unrecognized command line options. Closes #1719696.
428 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
429 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
431 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
432 * - Don't rerun crunchers that only depend on the request URL.
433 * - Don't count redirects and CGI requests as "blocked requests".
435 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
436 * Support crunching based on tags created by server-header taggers.
438 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
439 * Make HTTP snippets static (again). Add a Content-Type for those
440 * with content so the browser doesn't guess it based on the URL.
442 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
443 * Move crunching and request line rebuilding out of chat().
445 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
446 * Introduce tags as alternative way to specify which
447 * actions apply to a request. At the moment tags can be
448 * created based on client and server headers.
450 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
451 * Don't CLF-log CONNECT requests twice.
453 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
454 * Log the source address for ACL-related connection drops.
456 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
457 * New config option: enforce-blocks.
459 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
460 * - Move null byte check into separate function.
461 * - Don't confuse the client with error pages
462 * if a CONNECT request was already confirmed.
464 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
465 * Speed up NULL byte escaping and only log the complete
466 * NULL byte requests with header debugging enabled.
468 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
469 * Answer requests that contain NULL bytes with
470 * a custom response instead of waiting for more
471 * data until the client eventually hangs up.
473 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
474 * - Move delivery and logging of crunched responses
475 * from chat() into send_crunch_response().
476 * - Display the reason for generating http_responses.
477 * - Log the content length for LOG_LEVEL_CLF correctly
478 * (still incorrect for some fixed responses).
479 * - Reword an incorrect comment about
480 * treat-forbidden-connects-like-blocks violating
482 * - Add some log messages.
484 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
485 * Move mutex initialization into separate
486 * function and exit in case of errors.
488 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
489 * - Start to reduce chat()'s line count and move
490 * parts of it into separate functions.
491 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
493 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
494 * - Add Proxy-Agent header to HTTP snippets that are
495 * supposed to reach HTTP clients only.
496 * - Made a few CONNECT log messages more descriptive.
497 * - Catch completely empty server responses (as seen
498 * with Tor's fake ".noconnect" top level domain).
499 * - Use shiny new "forwarding-failed" template for socks errors.
501 * Revision 1.118 2007/01/07 07:43:43 joergs
502 * AmigaOS4 support added.
504 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
505 * Added config option accept-intercepted-requests
506 * and disabled it by default.
508 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
509 * Reverted parts of my last commit
510 * to keep error handling working.
512 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
513 * Fixed gcc43 conversion warnings.
515 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
516 * Fix -pedantic ISO C warning about converting
517 * from function pointer to object pointer.
519 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
520 * Silence compiler warning I introduced with my last commit.
522 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
523 * Mutex protect rand() if POSIX threading
524 * is used, warn the user if that's not possible
525 * and stop using it on _WIN32 where it could
528 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
529 * Don't prevent core dumps by catching SIGABRT.
530 * It's rude and makes debugging unreasonable painful.
532 * Revision 1.110 2006/12/13 14:52:53 etresoft
533 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
535 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
536 * Privoxy is now able to run as intercepting
537 * proxy in combination with any packet filter
538 * that does the port redirection. The destination
539 * is extracted from the "Host:" header which
540 * should be available for nearly all requests.
542 * Moved HTTP snipplets into jcc.c.
543 * Added error message for gopher proxy requests.
545 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
546 * Only unlink the pidfile if it's actually used.
548 * Change order of interception checks to make
549 * it possible to block or redirect requests for
552 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
553 * Make pthread mutex locking more generic. Instead of
554 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
555 * and use mutex locking unless there is an _r function
556 * available. Better safe than sorry.
558 * Fixes "./configure --disable-pthread" and should result
559 * in less threading-related problems on pthread-using platforms,
560 * but it still doesn't fix BR#1122404.
562 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
563 * Move pthread.h inclusion from jcc.c to jcc.h.
564 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
566 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
567 * Don't exit after receiving the second SIGHUP on Solaris.
569 * Fixes BR 1052235, but the same problem may exist on other
570 * systems. Once 3.0.6 is out we should use sigset()
571 * where available and see if it breaks anything.
573 * Revision 1.104 2006/09/23 13:26:38 roro
574 * Replace TABs by spaces in source code.
576 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
577 * Fix +redirect{}. Didn't work with -fast-redirects.
579 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
580 * Respond with 400 and a short text message
581 * if the client tries to use Privoxy as FTP proxy.
583 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
584 * Make number of retries in case of forwarded-connect problems
585 * a config file option (forwarded-connect-retries) and use 0 as
588 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
589 * Set random(3) seed.
591 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
592 * Follow the OpenBSD port's lead and protect the resolve
593 * functions on OpenBSD as well.
595 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
596 * --user fix. Only use the user as group if no group is specified.
597 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
599 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
600 * Windows service (re-)integration
604 * --install[:service_name]
605 * --uninstall[:service_name]
608 * They work as follows:
609 * --install will create a service for you and then terminate.
610 * By default the service name will be "privoxy" (without the quotes).
611 * However you can run multiple services if you wish, just by adding
612 * a colon and then a name (no spaces).
614 * --uninstall follows the exact same rules a --install.
616 * --service is used when the program is executed by the service
617 * control manager, and in normal circumstances would never be
618 * used as a command line argument.
620 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
621 * Windows service integration
623 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
624 * Incorporate Fabian Keil's patch work:
625 http://www.fabiankeil.de/sourcecode/privoxy/
627 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
628 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
629 * with what was really the latest development (the v_3_0_branch branch)
631 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
632 * Thanks to Jindrich Makovicka for a race condition fix for the log
633 * file. The race condition remains for non-pthread implementations.
634 * Reference patch #1175720.
636 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
637 * Add the ability to check jpeg images for invalid
638 * lengths of comment blocks. Defensive strategy
639 * against the exploit:
640 * Microsoft Security Bulletin MS04-028
641 * Buffer Overrun in JPEG Processing (GDI+) Could
642 * Allow Code Execution (833987)
643 * Enabled with +inspect-jpegs in actions files.
645 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
646 * - Fixed usage info for non-unix platforms
647 * - Fixed small cmdline parsing bug
649 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
650 * Diagnostics: Now preserve the returncode of pthread_create
651 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
653 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
654 * No longer ignore SIGCHLD. Fixes bug #769381
656 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
657 * Close jarfile on graceful exit, remove stray line
659 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
660 * Cosmetics: Killed a warning, a typo and an allocation left at exit
662 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
663 * No longer rely on non-POSIX.1 extensions of getcwd().
666 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
667 * Replaced setenv() by posix-compliant putenv()
668 * Thanks to Neil McCalden (nmcc AT users.sf.net).
670 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
671 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
673 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
674 * Clean-up and extension of improvements for forked mode:
675 * - Child's return code now consists of flags RC_FLAG_*
676 * - Reporting toggle to parent now properly #ifdef'ed
677 * - Children now report blocking to parent. This enables
678 * statistics in forked mode
680 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
681 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
682 * Children now report having been toggled through _exit(17), parents
683 * watch for that code and toggle themselves if found.
685 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
686 * Wrapping all *_r functions (the non-_r versions of them) with
687 * mutex semaphores for OSX. Hopefully this will take care of all
688 * of those pesky crash reports.
690 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
691 * Fixed two mostly harmless mem leaks
693 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
694 * Fix: Head of global clients list now initialized to NULL
696 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
697 * Added basic support for OPTIONS and TRACE HTTP methods:
698 * - New interceptor direct_response() added in chat().
699 * - sed() moved to earlier in the process, so that the
700 * Host: header is evaluated before actions and forwarding
703 * Revision 1.92 2002/05/08 16:00:46 oes
704 * Chat's buffer handling:
705 * - Fixed bug with unchecked out-of-mem conditions
706 * while reading client request & server headers
707 * - No longer predict if the buffer limit will be exceeded
708 * in the next read -- check add_to_iob's new
709 * return code. If buffer couldn't be extended
710 * (policy or out-of-mem) while
711 * - reading from client: abort
712 * - reading server headers: send error page
713 * - buffering server body for filter: flush,
714 * and if that fails: send error page
716 * Revision 1.91 2002/04/08 20:35:58 swa
719 * Revision 1.90 2002/04/02 14:57:28 oes
720 * Made sending wafers independent of FEATURE_COOKIE_JAR
722 * Revision 1.89 2002/03/31 17:18:59 jongfoster
723 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
725 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
726 * More compiler warning message maintenance
728 * Revision 1.87 2002/03/26 22:29:54 swa
729 * we have a new homepage!
731 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
732 * Workaround for closing the jarfile before load_config() comes around again
734 * Revision 1.85 2002/03/24 15:23:33 jongfoster
737 * Revision 1.84 2002/03/24 13:25:43 swa
738 * name change related issues
740 * Revision 1.83 2002/03/16 23:54:06 jongfoster
741 * Adding graceful termination feature, to help look for memory leaks.
742 * If you enable this (which, by design, has to be done by hand
743 * editing config.h) and then go to http://i.j.b/die, then the program
744 * will exit cleanly after the *next* request. It should free all the
745 * memory that was used.
747 * Revision 1.82 2002/03/13 00:27:05 jongfoster
750 * Revision 1.81 2002/03/12 01:42:50 oes
751 * Introduced modular filters
753 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
754 * OS/2 port maintenance:
755 * - Fixed EMX build - it had decayed a little
756 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
757 * substituted a memset for now.
759 * Revision 1.79 2002/03/09 20:03:52 jongfoster
760 * - Making various functions return int rather than size_t.
761 * (Undoing a recent change). Since size_t is unsigned on
762 * Windows, functions like read_socket that return -1 on
763 * error cannot return a size_t.
765 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
766 * crashes, and also frequently caused JB to jump to 100%
767 * CPU and stay there. (Because it thought it had just
768 * read ((unsigned)-1) == 4Gb of data...)
770 * - The signature of write_socket has changed, it now simply
771 * returns success=0/failure=nonzero.
773 * - Trying to get rid of a few warnings --with-debug on
774 * Windows, I've introduced a new type "jb_socket". This is
775 * used for the socket file descriptors. On Windows, this
776 * is SOCKET (a typedef for unsigned). Everywhere else, it's
777 * an int. The error value can't be -1 any more, so it's
778 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
779 * Windows it maps to the #define INVALID_SOCKET.)
781 * - The signature of bind_port has changed.
783 * Revision 1.78 2002/03/08 21:35:04 oes
784 * Added optional group supplement to --user option. Will now use default group of user if no group given
786 * Revision 1.77 2002/03/07 03:52:06 oes
787 * - Fixed compiler warnings etc
788 * - Improved handling of failed DNS lookups
790 * Revision 1.76 2002/03/06 22:54:35 jongfoster
791 * Automated function-comment nitpicking.
793 * Revision 1.75 2002/03/06 10:02:19 oes
794 * Fixed stupid bug when --user was not given
796 * Revision 1.74 2002/03/06 00:49:31 jongfoster
797 * Fixing warning on Windows
798 * Making #ifdefs that refer to the same variable consistently
799 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
801 * Revision 1.73 2002/03/05 23:57:30 hal9
802 * Stray character 's' on line 1618 was breaking build.
804 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
805 * - Re-enable OS/2 building after new parms were added
806 * - Fix false out of memory report when resolving CGI templates when no IP
807 * address is available of failed attempt (a la no such domain)
809 * Revision 1.71 2002/03/05 18:13:56 oes
810 * Added --user option
812 * Revision 1.70 2002/03/05 04:52:42 oes
813 * Deleted non-errlog debugging code
815 * Revision 1.69 2002/03/04 23:50:00 jongfoster
816 * Splitting off bind_port() call into bind_port_helper(), with
819 * Revision 1.68 2002/03/04 20:17:32 oes
822 * Revision 1.67 2002/03/04 18:18:57 oes
823 * - Removed _DEBUG mode
824 * - Cleand up cmdline parsing
825 * - Introduced --no-daemon, --pidfile options
826 * - Cleaned up signal handling:
827 * - Terminate cleanly on INT, TERM and ABRT
828 * - Schedule logfile for re-opening on HUP
829 * - Ignore CHLD and PIPE
830 * - Leave the rest with their default handlers
831 * - Uniform handler registration
832 * - Added usage() function
833 * - Played styleguide police
835 * Revision 1.66 2002/03/03 15:06:55 oes
836 * Re-enabled automatic config reloading
838 * Revision 1.65 2002/03/03 14:49:11 oes
839 * Fixed CLF logging: Now uses client's original HTTP request
841 * Revision 1.64 2002/03/03 09:18:03 joergs
842 * Made jumbjuster work on AmigaOS again.
844 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
845 * Clean up a little CRLF unpleasantness that suddenly appeared
847 * Revision 1.62 2002/02/20 23:17:23 jongfoster
848 * Detecting some out-of memory conditions and exiting with a log message.
850 * Revision 1.61 2002/01/17 21:01:52 jongfoster
851 * Moving all our URL and URL pattern parsing code to urlmatch.c.
853 * Revision 1.60 2001/12/30 14:07:32 steudten
854 * - Add signal handling (unix)
855 * - Add SIGHUP handler (unix)
856 * - Add creation of pidfile (unix)
857 * - Add action 'top' in rc file (RH)
858 * - Add entry 'SIGNALS' to manpage
859 * - Add exit message to logfile (unix)
861 * Revision 1.59 2001/12/13 14:07:18 oes
862 * Fixed Bug: 503 error page now sent OK
864 * Revision 1.58 2001/11/30 23:37:24 jongfoster
865 * Renaming the Win32 config file to config.txt - this is almost the
866 * same as the corresponding UNIX name "config"
868 * Revision 1.57 2001/11/16 00:47:43 jongfoster
869 * Changing the tty-disconnection code to use setsid().
871 * Revision 1.56 2001/11/13 20:20:54 jongfoster
872 * Tabs->spaces, fixing a bug with missing {} around an if()
874 * Revision 1.55 2001/11/13 20:14:53 jongfoster
875 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
877 * Revision 1.54 2001/11/07 00:03:14 steudten
878 * Give reliable return value if an error
879 * occurs not just 0 with new daemon mode.
881 * Revision 1.53 2001/11/05 21:41:43 steudten
882 * Add changes to be a real daemon just for unix os.
883 * (change cwd to /, detach from controlling tty, set
884 * process group and session leader to the own process.
886 * Add some fatal-error log message for failed malloc().
887 * Add '-d' if compiled with 'configure --with-debug' to
888 * enable debug output.
890 * Revision 1.52 2001/10/26 20:11:20 jongfoster
891 * Fixing type mismatch
893 * Revision 1.51 2001/10/26 17:38:28 oes
896 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
897 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
898 * threads to call select() simultaneously. So, it's time to do a real, live,
899 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
900 * (native). Both versions will work, but using __OS2__ offers multi-threading.
902 * Revision 1.49 2001/10/23 21:41:35 jongfoster
903 * Added call to initialize the (statically-allocated of course)
904 * "out of memory" CGI response.
906 * Revision 1.48 2001/10/10 19:56:46 jongfoster
907 * Moving some code that wasn't cookie-related out of an #ifdef
910 * Revision 1.47 2001/10/10 16:44:36 oes
911 * Added CONNECT destination port limitation check
913 * Revision 1.46 2001/10/08 15:17:41 oes
914 * Re-enabled SSL forwarding
916 * Revision 1.45 2001/10/07 15:42:11 oes
917 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
919 * Moved downgrading of the HTTP version from parse_http_request to
920 * chat(), since we can't decide if it is necessary before we have
921 * determined the actions for the URL. The HTTP command is now
922 * *always* re-built so the repairs need no longer be special-cased.
924 * filter_popups now gets a csp pointer so it can raise the new
925 * CSP_FLAG_MODIFIED flag.
929 * Added configurable size limit for the IOB. If the IOB grows so
930 * large that the next read would exceed the limit, the header
931 * is generated, and the header & unfiltered buffer are flushed
932 * to the client. Chat then continues in non-buffering,
933 * non-filtering body mode.
935 * Revision 1.44 2001/10/02 18:13:57 oes
938 * Revision 1.43 2001/10/02 15:32:13 oes
939 * Moved generation of hdr
941 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
942 * Cleaning up 2 compiler warnings on OS/2.
944 * Revision 1.41 2001/09/16 17:05:14 jongfoster
945 * Removing unused #include showarg.h
947 * Revision 1.40 2001/09/16 15:41:45 jongfoster
948 * Fixing signed/unsigned comparison warning.
950 * Revision 1.39 2001/09/16 13:21:27 jongfoster
951 * Changes to use new list functions.
953 * Revision 1.38 2001/09/16 13:01:46 jongfoster
954 * Removing redundant function call that zeroed zalloc()'d memory.
956 * Revision 1.37 2001/09/10 11:12:24 oes
957 * Deleted unused variable
959 * Revision 1.36 2001/09/10 10:56:15 oes
960 * Silenced compiler warnings
962 * Revision 1.35 2001/07/31 14:44:22 oes
963 * Deleted unused size parameter from filter_popups()
965 * Revision 1.34 2001/07/30 22:08:36 jongfoster
966 * Tidying up #defines:
967 * - All feature #defines are now of the form FEATURE_xxx
968 * - Permanently turned off WIN_GUI_EDIT
969 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
971 * Revision 1.33 2001/07/29 19:32:00 jongfoster
972 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
974 * Revision 1.32 2001/07/29 18:47:05 jongfoster
975 * Adding missing #include "loadcfg.h"
977 * Revision 1.31 2001/07/29 12:17:48 oes
978 * Applied pthread fix by Paul Lieverse
980 * Revision 1.30 2001/07/25 22:57:13 jongfoster
981 * __BEOS__ no longer overrides FEATURE_PTHREAD.
982 * This is because FEATURE_PTHREAD will soon be widely used, so I
983 * want to keep it simple.
985 * Revision 1.29 2001/07/24 12:47:06 oes
986 * Applied BeOS support update by Eugenia
988 * Revision 1.28 2001/07/23 13:26:12 oes
989 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
991 * Revision 1.27 2001/07/19 19:09:47 haroon
992 * - Added code to take care of the situation where while processing the first
993 * server response (which includes the server header), after finding the end
994 * of the headers we were not looking past the end of the headers for
995 * content modification. I enabled it for filter_popups.
996 * Someone else should look to see if other similar operations should be
997 * done to the discarded portion of the buffer.
999 * Note 2001/07/20: No, the other content modification mechanisms will process
1000 * the whole iob later anyway. --oes
1002 * Revision 1.26 2001/07/18 12:31:36 oes
1005 * Revision 1.25 2001/07/15 19:43:49 jongfoster
1006 * Supports POSIX threads.
1007 * Also removed some unused #includes.
1009 * Revision 1.24 2001/07/13 14:00:40 oes
1010 * - Generic content modification scheme:
1011 * Each feature has its own applicability flag that is set
1012 * from csp->action->flags.
1013 * Replaced the "filtering" int flag , by a function pointer
1014 * "content_filter" to the function that will do the content
1015 * modification. If it is != NULL, the document will be buffered
1016 * and processed through *content_filter, which must set
1017 * csp->content_length and return a modified copy of the body
1018 * or return NULL (on failiure).
1019 * - Changed csp->is_text to the more generic bitmap csp->content_type
1020 * which can currently take the valued CT_TEXT or CT_GIF
1021 * - Reformatting etc
1022 * - Removed all #ifdef PCRS
1024 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
1025 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
1026 * the `block_acl' call. This prevents a compilation error when the user
1027 * does not wish to use the "ACL" feature.
1029 * Revision 1.22 2001/06/29 21:45:41 oes
1030 * Indentation, CRLF->LF, Tab-> Space
1032 * Revision 1.21 2001/06/29 13:29:36 oes
1033 * - Cleaned up, improved comments
1034 * - Unified all possible interceptors (CGI,
1035 * block, trust, fast_redirect) in one
1036 * place, with one (CGI) answer generation
1037 * mechansim. Much clearer now.
1038 * - Removed the GIF image generation, which
1039 * is now done in filters.c:block_url()
1040 * - Made error conditions like domain lookup
1041 * failiure or (various) problems while talking
1042 * to the server use cgi.c:error_response()
1043 * instead of generating HTML/HTTP in chat() (yuck!)
1044 * - Removed logentry from cancelled commit
1046 * Revision 1.20 2001/06/09 10:55:28 jongfoster
1047 * Changing BUFSIZ ==> BUFFER_SIZE
1049 * Revision 1.19 2001/06/07 23:12:52 jongfoster
1050 * Replacing function pointer in struct gateway with a directly
1051 * called function forwarded_connect().
1052 * Replacing struct gateway with struct forward_spec
1054 * Revision 1.18 2001/06/03 19:12:16 oes
1055 * introduced new cgi handling
1057 * Revision 1.17 2001/06/01 20:07:23 jongfoster
1058 * Now uses action +image-blocker{} rather than config->tinygif
1060 * Revision 1.16 2001/06/01 18:49:17 jongfoster
1061 * Replaced "list_share" with "list" - the tiny memory gain was not
1062 * worth the extra complexity.
1064 * Revision 1.15 2001/05/31 21:24:47 jongfoster
1065 * Changed "permission" to "action" throughout.
1066 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
1067 * Moved vanilla wafer check into chat(), since we must now
1068 * decide whether or not to add it based on the URL.
1070 * Revision 1.14 2001/05/29 20:14:01 joergs
1071 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
1074 * Revision 1.13 2001/05/29 09:50:24 jongfoster
1075 * Unified blocklist/imagelist/permissionslist.
1076 * File format is still under discussion, but the internal changes
1077 * are (mostly) done.
1079 * Also modified interceptor behaviour:
1080 * - We now intercept all URLs beginning with one of the following
1081 * prefixes (and *only* these prefixes):
1083 * * http://ijbswa.sf.net/config/
1084 * * http://ijbswa.sourceforge.net/config/
1085 * - New interceptors "home page" - go to http://i.j.b/ to see it.
1086 * - Internal changes so that intercepted and fast redirect pages
1087 * are not replaced with an image.
1088 * - Interceptors now have the option to send a binary page direct
1089 * to the client. (i.e. ijb-send-banner uses this)
1090 * - Implemented show-url-info interceptor. (Which is why I needed
1091 * the above interceptors changes - a typical URL is
1092 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
1093 * The previous mechanism would not have intercepted that, and
1094 * if it had been intercepted then it then it would have replaced
1095 * it with an image.)
1097 * Revision 1.12 2001/05/27 22:17:04 oes
1099 * - re_process_buffer no longer writes the modified buffer
1100 * to the client, which was very ugly. It now returns the
1101 * buffer, which it is then written by chat.
1103 * - content_length now adjusts the Content-Length: header
1104 * for modified documents rather than crunch()ing it.
1105 * (Length info in csp->content_length, which is 0 for
1106 * unmodified documents)
1108 * - For this to work, sed() is called twice when filtering.
1110 * Revision 1.11 2001/05/26 17:27:53 jongfoster
1111 * Added support for CLF and fixed LOG_LEVEL_LOG.
1112 * Also did CRLF->LF fix of my previous patch.
1114 * Revision 1.10 2001/05/26 15:26:15 jongfoster
1115 * ACL feature now provides more security by immediately dropping
1116 * connections from untrusted hosts.
1118 * Revision 1.9 2001/05/26 00:28:36 jongfoster
1119 * Automatic reloading of config file.
1120 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
1121 * Most of the global variables have been moved to a new
1122 * struct configuration_spec, accessed through csp->config->globalname
1123 * Most of the globals remaining are used by the Win32 GUI.
1125 * Revision 1.8 2001/05/25 22:43:18 jongfoster
1126 * Fixing minor memory leak and buffer overflow.
1128 * Revision 1.7 2001/05/25 22:34:30 jongfoster
1131 * Revision 1.6 2001/05/23 00:13:58 joergs
1132 * AmigaOS support fixed.
1134 * Revision 1.5 2001/05/22 18:46:04 oes
1136 * - Enabled filtering banners by size rather than URL
1137 * by adding patterns that replace all standard banner
1138 * sizes with the "Junkbuster" gif to the re_filterfile
1140 * - Enabled filtering WebBugs by providing a pattern
1141 * which kills all 1x1 images
1143 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
1144 * which is selected by the (nonstandard and therefore
1145 * capital) letter 'U' in the option string.
1146 * It causes the quantifiers to be ungreedy by default.
1147 * Appending a ? turns back to greedy (!).
1149 * - Added a new interceptor ijb-send-banner, which
1150 * sends back the "Junkbuster" gif. Without imagelist or
1151 * MSIE detection support, or if tinygif = 1, or the
1152 * URL isn't recognized as an imageurl, a lame HTML
1153 * explanation is sent instead.
1155 * - Added new feature, which permits blocking remote
1156 * script redirects and firing back a local redirect
1158 * The feature is conditionally compiled, i.e. it
1159 * can be disabled with --disable-fast-redirects,
1160 * plus it must be activated by a "fast-redirects"
1161 * line in the config file, has its own log level
1162 * and of course wants to be displayed by show-proxy-args
1163 * Note: Boy, all the #ifdefs in 1001 locations and
1164 * all the fumbling with configure.in and acconfig.h
1165 * were *way* more work than the feature itself :-(
1167 * - Because a generic redirect template was needed for
1168 * this, tinygif = 3 now uses the same.
1170 * - Moved GIFs, and other static HTTP response templates
1173 * - Some minor fixes
1175 * - Removed some >400 CRs again (Jon, you really worked
1178 * Revision 1.4 2001/05/21 19:34:01 jongfoster
1179 * Made failure to bind() a fatal error.
1181 * Revision 1.3 2001/05/20 01:21:20 jongfoster
1182 * Version 2.9.4 checkin.
1183 * - Merged popupfile and cookiefile, and added control over PCRS
1184 * filtering, in new "permissionsfile".
1185 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
1186 * file error you now get a message box (in the Win32 GUI) rather
1187 * than the program exiting with no explanation.
1188 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
1190 * - Removed tabs from "config"
1191 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
1192 * - Bumped up version number.
1194 * Revision 1.2 2001/05/17 22:34:44 oes
1195 * - Added hint on GIF char array generation to jcc.c
1196 * - Cleaned CRLF's from the sources and related files
1197 * - Repaired logging for REF and FRC
1199 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
1200 * Initial import of version 2.9.3 source tree
1203 *********************************************************************/
1209 #include <sys/types.h>
1218 # ifndef FEATURE_PTHREAD
1222 # include <windows.h>
1223 # include <process.h>
1224 # endif /* ndef FEATURE_PTHREAD */
1227 # ifndef _WIN_CONSOLE
1228 # include "w32log.h"
1229 # endif /* ndef _WIN_CONSOLE */
1230 # include "w32svrapi.h"
1232 #else /* ifndef _WIN32 */
1234 # if !defined (__OS2__)
1235 # include <unistd.h>
1236 # include <sys/wait.h>
1237 # endif /* ndef __OS2__ */
1238 # include <sys/time.h>
1239 # include <sys/stat.h>
1240 # include <sys/ioctl.h>
1243 #include <sys/termios.h>
1251 # include <signal.h>
1254 # include <socket.h> /* BeOS has select() for sockets only. */
1255 # include <OS.h> /* declarations for threads and stuff. */
1258 # if defined(__EMX__) || defined(__OS2__)
1259 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1264 #define bzero(B,N) memset(B,0x00,n)
1268 # include <select.h>
1273 #include "project.h"
1276 #include "filters.h"
1277 #include "loaders.h"
1278 #include "parsers.h"
1279 #include "miscutil.h"
1281 #include "jbsockets.h"
1282 #include "gateway.h"
1283 #include "actions.h"
1285 #include "loadcfg.h"
1286 #include "urlmatch.h"
1288 const char jcc_h_rcs[] = JCC_H_VERSION;
1289 const char project_h_rcs[] = PROJECT_H_VERSION;
1292 struct client_state clients[1];
1293 struct file_list files[1];
1295 #ifdef FEATURE_STATISTICS
1296 int urls_read = 0; /* total nr of urls read inc rejected */
1297 int urls_rejected = 0; /* total nr of urls rejected */
1298 #endif /* def FEATURE_STATISTICS */
1300 #ifdef FEATURE_GRACEFUL_TERMINATION
1301 int g_terminate = 0;
1304 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1305 static void sig_handler(int the_signal);
1307 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1308 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1309 static jb_err get_server_headers(struct client_state *csp);
1310 static const char *crunch_reason(const struct http_response *rsp);
1311 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
1312 static char *get_request_line(struct client_state *csp);
1313 static jb_err receive_client_request(struct client_state *csp);
1314 static jb_err parse_client_request(struct client_state *csp);
1315 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1316 static jb_err change_request_destination(struct client_state *csp);
1317 static void chat(struct client_state *csp);
1318 static void serve(struct client_state *csp);
1319 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1320 static void usage(const char *myname);
1322 static void initialize_mutexes(void);
1323 static jb_socket bind_port_helper(struct configuration_spec *config);
1324 static void listen_loop(void);
1327 void serve(struct client_state *csp);
1328 #else /* ifndef AMIGA */
1329 static void serve(struct client_state *csp);
1330 #endif /* def AMIGA */
1333 static int32 server_thread(void *data);
1334 #endif /* def __BEOS__ */
1337 #define sleep(N) Sleep(((N) * 1000))
1341 #define sleep(N) DosSleep(((N) * 100))
1344 #ifdef MUTEX_LOCKS_AVAILABLE
1346 * XXX: Does the locking stuff really belong in this file?
1348 privoxy_mutex_t log_mutex;
1349 privoxy_mutex_t log_init_mutex;
1350 privoxy_mutex_t connection_reuse_mutex;
1352 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1353 privoxy_mutex_t resolver_mutex;
1354 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1356 #ifndef HAVE_GMTIME_R
1357 privoxy_mutex_t gmtime_mutex;
1358 #endif /* ndef HAVE_GMTIME_R */
1360 #ifndef HAVE_LOCALTIME_R
1361 privoxy_mutex_t localtime_mutex;
1362 #endif /* ndef HAVE_GMTIME_R */
1365 privoxy_mutex_t rand_mutex;
1366 #endif /* ndef HAVE_RANDOM */
1368 #endif /* def MUTEX_LOCKS_AVAILABLE */
1371 const char *basedir = NULL;
1372 const char *pidfile = NULL;
1373 static int received_hup_signal = 0;
1374 #endif /* defined unix */
1376 /* HTTP snipplets. */
1377 static const char CSUCCEED[] =
1378 "HTTP/1.0 200 Connection established\r\n"
1379 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1381 static const char CHEADER[] =
1382 "HTTP/1.0 400 Invalid header received from client\r\n"
1383 "Proxy-Agent: Privoxy " VERSION "\r\n"
1384 "Content-Type: text/plain\r\n"
1385 "Connection: close\r\n\r\n"
1386 "Invalid header received from client.\r\n";
1388 static const char FTP_RESPONSE[] =
1389 "HTTP/1.0 400 Invalid request received from client\r\n"
1390 "Content-Type: text/plain\r\n"
1391 "Connection: close\r\n\r\n"
1392 "Invalid request. Privoxy doesn't support FTP.\r\n";
1394 static const char GOPHER_RESPONSE[] =
1395 "HTTP/1.0 400 Invalid request received from client\r\n"
1396 "Content-Type: text/plain\r\n"
1397 "Connection: close\r\n\r\n"
1398 "Invalid request. Privoxy doesn't support gopher.\r\n";
1400 /* XXX: should be a template */
1401 static const char MISSING_DESTINATION_RESPONSE[] =
1402 "HTTP/1.0 400 Bad request received from client\r\n"
1403 "Proxy-Agent: Privoxy " VERSION "\r\n"
1404 "Content-Type: text/plain\r\n"
1405 "Connection: close\r\n\r\n"
1406 "Bad request. Privoxy was unable to extract the destination.\r\n";
1408 /* XXX: should be a template */
1409 static const char NO_SERVER_DATA_RESPONSE[] =
1410 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1411 "Proxy-Agent: Privoxy " VERSION "\r\n"
1412 "Content-Type: text/plain\r\n"
1413 "Connection: close\r\n\r\n"
1414 "Empty server or forwarder response.\r\n"
1415 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1417 /* XXX: should be a template */
1418 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1419 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1420 "Proxy-Agent: Privoxy " VERSION "\r\n"
1421 "Content-Type: text/plain\r\n"
1422 "Connection: close\r\n\r\n"
1423 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1426 /* XXX: should be a template */
1427 static const char NULL_BYTE_RESPONSE[] =
1428 "HTTP/1.0 400 Bad request received from client\r\n"
1429 "Proxy-Agent: Privoxy " VERSION "\r\n"
1430 "Content-Type: text/plain\r\n"
1431 "Connection: close\r\n\r\n"
1432 "Bad request. Null byte(s) before end of request.\r\n";
1435 /* XXX: should be a template */
1436 static const char MESSED_UP_REQUEST_RESPONSE[] =
1437 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1438 "Proxy-Agent: Privoxy " VERSION "\r\n"
1439 "Content-Type: text/plain\r\n"
1440 "Connection: close\r\n\r\n"
1441 "Bad request. Messed up with header filters.\r\n";
1443 /* XXX: should be a template */
1444 static const char CONNECTION_TIMEOUT_RESPONSE[] =
1445 "HTTP/1.0 502 Connection timeout\r\n"
1446 "Proxy-Agent: Privoxy " VERSION "\r\n"
1447 "Content-Type: text/plain\r\n"
1448 "Connection: close\r\n\r\n"
1449 "The connection timed out.\r\n";
1451 /* A function to crunch a response */
1452 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1454 /* Crunch function flags */
1455 #define CF_NO_FLAGS 0
1456 /* Cruncher applies to forced requests as well */
1457 #define CF_IGNORE_FORCE 1
1458 /* Crunched requests are counted for the block statistics */
1459 #define CF_COUNT_AS_REJECT 2
1461 /* A crunch function and its flags */
1464 const crunch_func_ptr cruncher;
1468 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1470 /* Complete list of cruncher functions */
1471 static const struct cruncher crunchers_all[] = {
1472 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1473 { block_url, CF_COUNT_AS_REJECT },
1474 #ifdef FEATURE_TRUST
1475 { trust_url, CF_COUNT_AS_REJECT },
1476 #endif /* def FEATURE_TRUST */
1477 { redirect_url, CF_NO_FLAGS },
1478 { dispatch_cgi, CF_IGNORE_FORCE},
1482 /* Light version, used after tags are applied */
1483 static const struct cruncher crunchers_light[] = {
1484 { block_url, CF_COUNT_AS_REJECT },
1485 { redirect_url, CF_NO_FLAGS },
1491 * XXX: Don't we really mean
1497 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1498 /*********************************************************************
1500 * Function : sig_handler
1502 * Description : Signal handler for different signals.
1503 * Exit gracefully on TERM and INT
1504 * or set a flag that will cause the errlog
1505 * to be reopened by the main thread on HUP.
1508 * 1 : the_signal = the signal cause this function to call
1512 *********************************************************************/
1513 static void sig_handler(int the_signal)
1519 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1531 received_hup_signal = 1;
1537 * We shouldn't be here, unless we catch signals
1538 * in main() that we can't handle here!
1540 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1548 /*********************************************************************
1550 * Function : client_protocol_is_unsupported
1552 * Description : Checks if the client used a known unsupported
1553 * protocol and deals with it by sending an error
1557 * 1 : csp = Current client state (buffers, headers, etc...)
1558 * 2 : req = the first request line send by the client
1560 * Returns : TRUE if an error response has been generated, or
1561 * FALSE if the request doesn't look invalid.
1563 *********************************************************************/
1564 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1567 * If it's a FTP or gopher request, we don't support it.
1569 * These checks are better than nothing, but they might
1570 * not work in all configurations and some clients might
1571 * have problems digesting the answer.
1573 * They should, however, never cause more problems than
1574 * Privoxy's old behaviour (returning the misleading HTML
1577 * "Could not resolve http://(ftp|gopher)://example.org").
1579 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1581 const char *response = NULL;
1582 const char *protocol = NULL;
1584 if (!strncmpic(req, "GET ftp://", 10))
1586 response = FTP_RESPONSE;
1591 response = GOPHER_RESPONSE;
1592 protocol = "GOPHER";
1594 log_error(LOG_LEVEL_ERROR,
1595 "%s tried to use Privoxy as %s proxy: %s",
1596 csp->ip_addr_str, protocol, req);
1597 log_error(LOG_LEVEL_CLF,
1598 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1600 write_socket(csp->cfd, response, strlen(response));
1609 /*********************************************************************
1611 * Function : get_request_destination_elsewhere
1613 * Description : If the client's request was redirected into
1614 * Privoxy without the client's knowledge,
1615 * the request line lacks the destination host.
1617 * This function tries to get it elsewhere,
1618 * provided accept-intercepted-requests is enabled.
1620 * "Elsewhere" currently only means "Host: header",
1621 * but in the future we may ask the redirecting
1622 * packet filter to look the destination up.
1624 * If the destination stays unknown, an error
1625 * response is send to the client and headers
1626 * are freed so that chat() can return directly.
1629 * 1 : csp = Current client state (buffers, headers, etc...)
1630 * 2 : headers = a header list
1632 * Returns : JB_ERR_OK if the destination is now known, or
1633 * JB_ERR_PARSE if it isn't.
1635 *********************************************************************/
1636 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1640 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1642 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1643 " Privoxy isn't configured to accept intercepted requests.",
1644 csp->ip_addr_str, csp->http->cmd);
1645 /* XXX: Use correct size */
1646 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1647 csp->ip_addr_str, csp->http->cmd);
1649 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1650 destroy_list(headers);
1652 return JB_ERR_PARSE;
1654 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1656 /* Split the domain we just got for pattern matching */
1657 init_domain_components(csp->http);
1663 /* We can't work without destination. Go spread the news.*/
1665 req = list_to_text(headers);
1667 /* XXX: Use correct size */
1668 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1669 csp->ip_addr_str, csp->http->cmd);
1670 log_error(LOG_LEVEL_ERROR,
1671 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1672 csp->ip_addr_str, csp->http->cmd, req);
1675 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1676 destroy_list(headers);
1678 return JB_ERR_PARSE;
1681 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1682 * to get the destination IP address, use it as host directly
1683 * or do a reverse DNS lookup first.
1688 /*********************************************************************
1690 * Function : get_server_headers
1692 * Description : Parses server headers in iob and fills them
1693 * into csp->headers so that they can later be
1697 * 1 : csp = Current client state (buffers, headers, etc...)
1699 * Returns : JB_ERR_OK if everything went fine, or
1700 * JB_ERR_PARSE if the headers were incomplete.
1702 *********************************************************************/
1703 static jb_err get_server_headers(struct client_state *csp)
1705 int continue_hack_in_da_house = 0;
1708 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1713 * continue hack in da house. Ignore the ending of
1714 * this head and continue enlisting header lines.
1715 * The reason is described below.
1717 enlist(csp->headers, "");
1718 continue_hack_in_da_house = 0;
1721 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1724 * It's a bodyless continue response, don't
1725 * stop header parsing after reaching its end.
1727 * As a result Privoxy will concatenate the
1728 * next response's head and parse and deliver
1729 * the headers as if they belonged to one request.
1731 * The client will separate them because of the
1732 * empty line between them.
1734 * XXX: What we're doing here is clearly against
1735 * the intended purpose of the continue header,
1736 * and under some conditions (HTTP/1.0 client request)
1737 * it's a standard violation.
1739 * Anyway, "sort of against the spec" is preferable
1740 * to "always getting confused by Continue responses"
1741 * (Privoxy's behaviour before this hack was added)
1743 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1744 continue_hack_in_da_house = 1;
1746 else if (*header == '\0')
1749 * If the header is empty, but the Continue hack
1750 * isn't active, we can assume that we reached the
1751 * end of the buffer before we hit the end of the
1754 * Inform the caller an let it decide how to handle it.
1756 return JB_ERR_PARSE;
1759 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1762 * XXX: Should we quit the request and return a
1763 * out of memory error page instead?
1765 log_error(LOG_LEVEL_ERROR,
1766 "Out of memory while enlisting server headers. %s lost.",
1776 /*********************************************************************
1778 * Function : crunch_reason
1780 * Description : Translates the crunch reason code into a string.
1783 * 1 : rsp = a http_response
1785 * Returns : A string with the crunch reason or an error description.
1787 *********************************************************************/
1788 static const char *crunch_reason(const struct http_response *rsp)
1790 char * reason = NULL;
1792 assert(rsp != NULL);
1795 return "Internal error while searching for crunch reason";
1798 switch (rsp->reason)
1800 case RSP_REASON_UNSUPPORTED:
1801 reason = "Unsupported HTTP feature";
1803 case RSP_REASON_BLOCKED:
1806 case RSP_REASON_UNTRUSTED:
1807 reason = "Untrusted";
1809 case RSP_REASON_REDIRECTED:
1810 reason = "Redirected";
1812 case RSP_REASON_CGI_CALL:
1813 reason = "CGI Call";
1815 case RSP_REASON_NO_SUCH_DOMAIN:
1816 reason = "DNS failure";
1818 case RSP_REASON_FORWARDING_FAILED:
1819 reason = "Forwarding failed";
1821 case RSP_REASON_CONNECT_FAILED:
1822 reason = "Connection failure";
1824 case RSP_REASON_OUT_OF_MEMORY:
1825 reason = "Out of memory (may mask other reasons)";
1828 reason = "No reason recorded";
1836 /*********************************************************************
1838 * Function : send_crunch_response
1840 * Description : Delivers already prepared response for
1841 * intercepted requests, logs the interception
1842 * and frees the response.
1845 * 1 : csp = Current client state (buffers, headers, etc...)
1846 * 1 : rsp = Fully prepared response. Will be freed on exit.
1848 * Returns : Nothing.
1850 *********************************************************************/
1851 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
1853 const struct http_request *http = csp->http;
1854 char status_code[4];
1856 assert(rsp != NULL);
1857 assert(rsp->head != NULL);
1862 * Not supposed to happen. If it does
1863 * anyway, treat it as an unknown error.
1865 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1866 /* return code doesn't matter */
1871 /* If rsp is still NULL, we have serious internal problems. */
1872 log_error(LOG_LEVEL_FATAL,
1873 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1877 * Extract the status code from the actual head
1878 * that was send to the client. It is the only
1879 * way to get it right for all requests, including
1880 * the fixed ones for out-of-memory problems.
1882 * A head starts like this: 'HTTP/1.1 200...'
1886 status_code[0] = rsp->head[9];
1887 status_code[1] = rsp->head[10];
1888 status_code[2] = rsp->head[11];
1889 status_code[3] = '\0';
1891 /* Write the answer to the client */
1892 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1893 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1895 /* There is nothing we can do about it. */
1896 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1899 /* Log that the request was crunched and why. */
1900 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
1901 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
1902 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1904 /* Clean up and return */
1905 if (cgi_error_memory() != rsp)
1907 free_http_response(rsp);
1914 /*********************************************************************
1916 * Function : request_contains_null_bytes
1918 * Description : Checks for NULL bytes in the request and sends
1919 * an error message to the client if any were found.
1921 * XXX: currently not used, see comment in chat().
1924 * 1 : csp = Current client state (buffers, headers, etc...)
1925 * 2 : buf = Data from the client's request to check.
1926 * 3 : len = The data length.
1928 * Returns : TRUE if the request contained one or more NULL bytes, or
1931 *********************************************************************/
1932 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1934 size_t c_len; /* Request lenght when treated as C string */
1936 c_len = strlen(buf);
1941 * Null byte(s) found. Log the request,
1942 * return an error response and hang up.
1944 size_t tmp_len = c_len;
1949 * Replace NULL byte(s) with '°' characters
1950 * so the request can be logged as string.
1951 * XXX: Is there a better replacement character?
1954 tmp_len += strlen(buf+tmp_len);
1955 } while (tmp_len < len);
1957 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1958 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
1959 log_error(LOG_LEVEL_HEADER,
1960 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1962 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1964 /* XXX: Log correct size */
1965 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1975 /*********************************************************************
1977 * Function : crunch_response_triggered
1979 * Description : Checks if the request has to be crunched,
1980 * and delivers the crunch response if necessary.
1983 * 1 : csp = Current client state (buffers, headers, etc...)
1984 * 2 : crunchers = list of cruncher functions to run
1986 * Returns : TRUE if the request was answered with a crunch response
1989 *********************************************************************/
1990 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
1992 struct http_response *rsp = NULL;
1993 const struct cruncher *c;
1996 * If CGI request crunching is disabled,
1997 * check the CGI dispatcher out of order to
1998 * prevent unintentional blocks or redirects.
2000 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
2001 && (NULL != (rsp = dispatch_cgi(csp))))
2003 /* Deliver, log and free the interception response. */
2004 send_crunch_response(csp, rsp);
2008 for (c = crunchers; c->cruncher != NULL; c++)
2011 * Check the cruncher if either Privoxy is toggled
2012 * on and the request isn't forced, or if the cruncher
2013 * applies to forced requests as well.
2015 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
2016 !(csp->flags & CSP_FLAG_FORCED)) ||
2017 (c->flags & CF_IGNORE_FORCE))
2019 rsp = c->cruncher(csp);
2022 /* Deliver, log and free the interception response. */
2023 send_crunch_response(csp, rsp);
2024 #ifdef FEATURE_STATISTICS
2025 if (c->flags & CF_COUNT_AS_REJECT)
2027 csp->flags |= CSP_FLAG_REJECTED;
2029 #endif /* def FEATURE_STATISTICS */
2040 /*********************************************************************
2042 * Function : build_request_line
2044 * Description : Builds the HTTP request line.
2046 * If a HTTP forwarder is used it expects the whole URL,
2047 * web servers only get the path.
2050 * 1 : csp = Current client state (buffers, headers, etc...)
2051 * 2 : fwd = The forwarding spec used for the request
2052 * XXX: Should use http->fwd instead.
2053 * 3 : request_line = The old request line which will be replaced.
2055 * Returns : Nothing. Terminates in case of memory problems.
2057 *********************************************************************/
2058 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
2060 struct http_request *http = csp->http;
2062 assert(http->ssl == 0);
2065 * Downgrade http version from 1.1 to 1.0
2066 * if +downgrade action applies.
2068 if ( (csp->action->flags & ACTION_DOWNGRADE)
2069 && (!strcmpic(http->ver, "HTTP/1.1")))
2072 http->ver = strdup("HTTP/1.0");
2074 if (http->ver == NULL)
2076 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
2081 * Rebuild the request line.
2083 freez(*request_line);
2084 *request_line = strdup(http->gpc);
2085 string_append(request_line, " ");
2087 if (fwd->forward_host)
2089 string_append(request_line, http->url);
2093 string_append(request_line, http->path);
2095 string_append(request_line, " ");
2096 string_append(request_line, http->ver);
2098 if (*request_line == NULL)
2100 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
2102 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
2106 /*********************************************************************
2108 * Function : change_request_destination
2110 * Description : Parse a (rewritten) request line and regenerate
2111 * the http request data.
2114 * 1 : csp = Current client state (buffers, headers, etc...)
2116 * Returns : Forwards the parse_http_request() return code.
2117 * Terminates in case of memory problems.
2119 *********************************************************************/
2120 static jb_err change_request_destination(struct client_state *csp)
2122 struct http_request *http = csp->http;
2125 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
2126 free_http_request(http);
2127 err = parse_http_request(csp->headers->first->str, http);
2128 if (JB_ERR_OK != err)
2130 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2131 jb_err_to_string(err));
2135 /* XXX: ocmd is a misleading name */
2136 http->ocmd = strdup(http->cmd);
2137 if (http->ocmd == NULL)
2139 log_error(LOG_LEVEL_FATAL,
2140 "Out of memory copying rewritten HTTP request line");
2148 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2149 /*********************************************************************
2151 * Function : server_response_is_complete
2153 * Description : Determines whether we should stop reading
2154 * from the server socket.
2157 * 1 : csp = Current client state (buffers, headers, etc...)
2158 * 2 : content_length = Length of content received so far.
2160 * Returns : TRUE if the response is complete,
2163 *********************************************************************/
2164 static int server_response_is_complete(struct client_state *csp, size_t content_length)
2166 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
2168 if (!strcmpic(csp->http->gpc, "HEAD"))
2171 * "HEAD" implies no body, we are thus expecting
2172 * no content. XXX: incomplete "list" of methods?
2174 csp->expected_content_length = 0;
2175 content_length_known = TRUE;
2178 if (csp->http->status == 304)
2181 * Expect no body. XXX: incomplete "list" of status codes?
2183 csp->expected_content_length = 0;
2184 content_length_known = TRUE;
2187 return (content_length_known && ((0 == csp->expected_content_length)
2188 || (csp->expected_content_length <= content_length)));
2192 /*********************************************************************
2194 * Function : wait_for_alive_connections
2196 * Description : Waits for alive connections to timeout.
2202 *********************************************************************/
2203 static void wait_for_alive_connections()
2205 int connections_alive = close_unusable_connections();
2207 while (0 < connections_alive)
2209 log_error(LOG_LEVEL_CONNECT,
2210 "Waiting for %d connections to timeout.",
2213 connections_alive = close_unusable_connections();
2216 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
2219 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2222 /*********************************************************************
2224 * Function : mark_server_socket_tainted
2226 * Description : Makes sure we don't reuse a server socket
2227 * (if we didn't read everything the server sent
2228 * us reusing the socket would lead to garbage).
2231 * 1 : csp = Current client state (buffers, headers, etc...)
2235 *********************************************************************/
2236 static void mark_server_socket_tainted(struct client_state *csp)
2238 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
2240 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
2241 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
2245 /*********************************************************************
2247 * Function : get_request_line
2249 * Description : Read the client request line.
2252 * 1 : csp = Current client state (buffers, headers, etc...)
2254 * Returns : Pointer to request line or NULL in case of errors.
2256 *********************************************************************/
2257 static char *get_request_line(struct client_state *csp)
2259 char buf[BUFFER_SIZE];
2260 char *request_line = NULL;
2263 memset(buf, 0, sizeof(buf));
2267 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2269 log_error(LOG_LEVEL_ERROR,
2270 "Stopped waiting for the request line.");
2271 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2272 strlen(CONNECTION_TIMEOUT_RESPONSE));
2276 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2278 if (len <= 0) return NULL;
2281 * If there is no memory left for buffering the
2282 * request, there is nothing we can do but hang up
2284 if (add_to_iob(csp, buf, len))
2289 request_line = get_header(csp->iob);
2291 } while ((NULL != request_line) && ('\0' == *request_line));
2293 return request_line;
2298 /*********************************************************************
2300 * Function : receive_client_request
2302 * Description : Read the client's request (more precisely the
2303 * client headers) and answer it if necessary.
2305 * Note that since we're not using select() we could get
2306 * blocked here if a client connected, then didn't say
2310 * 1 : csp = Current client state (buffers, headers, etc...)
2312 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
2314 *********************************************************************/
2315 static jb_err receive_client_request(struct client_state *csp)
2317 char buf[BUFFER_SIZE];
2320 struct http_request *http;
2324 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
2325 struct list header_list;
2326 struct list *headers = &header_list;
2330 memset(buf, 0, sizeof(buf));
2332 req = get_request_line(csp);
2335 return JB_ERR_PARSE;
2337 assert(*req != '\0');
2339 if (client_protocol_is_unsupported(csp, req))
2341 return JB_ERR_PARSE;
2344 #ifdef FEATURE_FORCE_LOAD
2346 * If this request contains the FORCE_PREFIX and blocks
2347 * aren't enforced, get rid of it and set the force flag.
2349 if (strstr(req, FORCE_PREFIX))
2351 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2353 log_error(LOG_LEVEL_FORCE,
2354 "Ignored force prefix in request: \"%s\".", req);
2358 strclean(req, FORCE_PREFIX);
2359 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2360 csp->flags |= CSP_FLAG_FORCED;
2363 #endif /* def FEATURE_FORCE_LOAD */
2365 err = parse_http_request(req, http);
2367 if (JB_ERR_OK != err)
2369 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2370 /* XXX: Use correct size */
2371 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2372 log_error(LOG_LEVEL_ERROR,
2373 "Couldn't parse request line received from %s: %s",
2374 csp->ip_addr_str, jb_err_to_string(err));
2376 free_http_request(http);
2377 return JB_ERR_PARSE;
2380 /* grab the rest of the client's headers */
2384 p = get_header(csp->iob);
2388 /* There are no additional headers to read. */
2395 * We didn't receive a complete header
2396 * line yet, get the rest of it.
2398 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2400 log_error(LOG_LEVEL_ERROR,
2401 "Stopped grabbing the client headers.");
2402 return JB_ERR_PARSE;
2405 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2408 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2409 destroy_list(headers);
2410 return JB_ERR_PARSE;
2413 if (add_to_iob(csp, buf, len))
2416 * If there is no memory left for buffering the
2417 * request, there is nothing we can do but hang up
2419 destroy_list(headers);
2420 return JB_ERR_MEMORY;
2426 * We were able to read a complete
2427 * header and can finaly enlist it.
2434 if (http->host == NULL)
2437 * If we still don't know the request destination,
2438 * the request is invalid or the client uses
2439 * Privoxy without its knowledge.
2441 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2444 * Our attempts to get the request destination
2445 * elsewhere failed or Privoxy is configured
2446 * to only accept proxy requests.
2448 * An error response has already been send
2449 * and we're done here.
2451 return JB_ERR_PARSE;
2456 * Determine the actions for this URL
2458 #ifdef FEATURE_TOGGLE
2459 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2461 /* Most compatible set of actions (i.e. none) */
2462 init_current_action(csp->action);
2465 #endif /* ndef FEATURE_TOGGLE */
2467 get_url_actions(csp, http);
2471 * Save a copy of the original request for logging
2473 http->ocmd = strdup(http->cmd);
2474 if (http->ocmd == NULL)
2476 log_error(LOG_LEVEL_FATAL,
2477 "Out of memory copying HTTP request line");
2479 enlist(csp->headers, http->cmd);
2481 /* Append the previously read headers */
2482 list_append_list_unique(csp->headers, headers);
2483 destroy_list(headers);
2490 /*********************************************************************
2492 * Function : parse_client_request
2494 * Description : Parses the client's request and decides what to do
2497 * Note that since we're not using select() we could get
2498 * blocked here if a client connected, then didn't say
2502 * 1 : csp = Current client state (buffers, headers, etc...)
2504 * Returns : JB_ERR_OK or JB_ERR_PARSE
2506 *********************************************************************/
2507 static jb_err parse_client_request(struct client_state *csp)
2509 struct http_request *http = csp->http;
2512 err = sed(csp, FILTER_CLIENT_HEADERS);
2513 if (JB_ERR_OK != err)
2515 /* XXX: Should be handled in sed(). */
2516 assert(err == JB_ERR_PARSE);
2517 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
2519 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2521 /* Check request line for rewrites. */
2522 if ((NULL == csp->headers->first->str)
2523 || (strcmp(http->cmd, csp->headers->first->str) &&
2524 (JB_ERR_OK != change_request_destination(csp))))
2527 * A header filter broke the request line - bail out.
2529 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2530 /* XXX: Use correct size */
2531 log_error(LOG_LEVEL_CLF,
2532 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2533 log_error(LOG_LEVEL_ERROR,
2534 "Invalid request line after applying header filters.");
2535 free_http_request(http);
2537 return JB_ERR_PARSE;
2545 /*********************************************************************
2549 * Description : Once a connection to the client has been accepted,
2550 * this function is called (via serve()) to handle the
2551 * main business of the communication. When this
2552 * function returns, the caller must close the client
2555 * FIXME: chat is nearly thousand lines long.
2559 * 1 : csp = Current client state (buffers, headers, etc...)
2561 * Returns : Nothing.
2563 *********************************************************************/
2564 static void chat(struct client_state *csp)
2566 char buf[BUFFER_SIZE];
2573 int ms_iis5_hack = 0;
2574 size_t byte_count = 0;
2575 int forwarded_connect_retries = 0;
2576 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
2577 const struct forward_spec *fwd;
2578 struct http_request *http;
2579 int len = 0; /* for buffer sizes (and negative error codes) */
2581 /* Function that does the content filtering for the current request */
2582 filter_function_ptr content_filter = NULL;
2584 /* Skeleton for HTTP response, if we should intercept the request */
2585 struct http_response *rsp;
2586 struct timeval timeout;
2588 memset(buf, 0, sizeof(buf));
2589 memset(&timeout, 0, sizeof(timeout));
2590 timeout.tv_sec = csp->config->socket_timeout;
2594 if (receive_client_request(csp) != JB_ERR_OK)
2598 if (parse_client_request(csp) != JB_ERR_OK)
2603 /* decide how to route the HTTP request */
2604 fwd = forward_url(csp, http);
2607 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2608 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2613 * build the http request to send to the server
2614 * we have to do one of the following:
2616 * create = use the original HTTP request to create a new
2617 * HTTP request that has either the path component
2618 * without the http://domainspec (w/path) or the
2619 * full orininal URL (w/url)
2620 * Note that the path and/or the HTTP version may
2621 * have been altered by now.
2623 * connect = Open a socket to the host:port of the server
2624 * and short-circuit server and client socket.
2626 * pass = Pass the request unchanged if forwarding a CONNECT
2627 * request to a parent proxy. Note that we'll be sending
2628 * the CFAIL message ourselves if connecting to the parent
2629 * fails, but we won't send a CSUCCEED message if it works,
2630 * since that would result in a double message (ours and the
2631 * parent's). After sending the request to the parent, we simply
2634 * here's the matrix:
2637 * +--------+--------+
2639 * 0 | create | connect|
2641 * Forwarding +--------+--------+
2643 * 1 | create | pass |
2645 * +--------+--------+
2649 if (http->ssl && connect_port_is_forbidden(csp))
2651 const char *acceptable_connect_ports =
2652 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2653 assert(NULL != acceptable_connect_ports);
2654 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2655 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2656 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2657 csp->action->flags |= ACTION_BLOCK;
2663 freez(csp->headers->first->str);
2664 build_request_line(csp, fwd, &csp->headers->first->str);
2668 * We have a request. Check if one of the crunchers wants it.
2670 if (crunch_response_triggered(csp, crunchers_all))
2673 * Yes. The client got the crunch response
2674 * and we are done here after cleaning up.
2676 /* XXX: why list_remove_all()? */
2677 list_remove_all(csp->headers);
2682 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2684 if (fwd->forward_host)
2686 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2687 fwd->forward_host, fwd->forward_port, http->hostport);
2691 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2694 /* here we connect to the server, gateway, or the forwarder */
2696 while ((csp->sfd = forwarded_connect(fwd, http, csp))
2697 && (errno == EINVAL)
2698 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2700 log_error(LOG_LEVEL_ERROR,
2701 "failed request #%u to connect to %s. Trying again.",
2702 forwarded_connect_retries, http->hostport);
2705 if (csp->sfd == JB_INVALID_SOCKET)
2707 if (fwd->type != SOCKS_NONE)
2710 rsp = error_response(csp, "forwarding-failed", errno);
2712 else if (errno == EINVAL)
2714 rsp = error_response(csp, "no-such-domain", errno);
2718 rsp = error_response(csp, "connect-failed", errno);
2719 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2723 /* Write the answer to the client */
2726 send_crunch_response(csp, rsp);
2732 hdr = list_to_text(csp->headers);
2735 /* FIXME Should handle error properly */
2736 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2738 list_remove_all(csp->headers);
2740 if (fwd->forward_host || (http->ssl == 0))
2743 * Write the client's (modified) header to the server
2744 * (along with anything else that may be in the buffer)
2746 if (write_socket(csp->sfd, hdr, strlen(hdr))
2747 || (flush_socket(csp->sfd, csp->iob) < 0))
2749 log_error(LOG_LEVEL_CONNECT,
2750 "write header to: %s failed: %E", http->hostport);
2752 rsp = error_response(csp, "connect-failed", errno);
2755 send_crunch_response(csp, rsp);
2765 * We're running an SSL tunnel and we're not forwarding,
2766 * so just send the "connect succeeded" message to the
2767 * client, flush the rest, and get out of the way.
2769 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2777 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2779 /* we're finished with the client's header */
2782 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
2784 /* pass data between the client and server
2785 * until one or the other shuts down the connection.
2794 * FD_ZERO here seems to point to an errant macro which crashes.
2795 * So do this by hand for now...
2797 memset(&rfds,0x00,sizeof(fd_set));
2801 FD_SET(csp->cfd, &rfds);
2802 FD_SET(csp->sfd, &rfds);
2804 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2805 if ((csp->flags & CSP_FLAG_CHUNKED)
2806 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2807 && ((csp->iob->eod - csp->iob->cur) >= 5)
2808 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2810 log_error(LOG_LEVEL_CONNECT,
2811 "Looks like we read the last chunk together with "
2812 "the server headers. We better stop reading.");
2813 byte_count = (size_t)(csp->iob->eod - csp->iob->cur);
2814 csp->expected_content_length = byte_count;
2815 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2817 if (server_body && server_response_is_complete(csp, byte_count))
2819 log_error(LOG_LEVEL_CONNECT,
2820 "Done reading from server. Expected content length: %u. "
2821 "Actual content length: %u. Most recently received: %d.",
2822 csp->expected_content_length, byte_count, len);
2825 * XXX: should not jump around,
2826 * chat() is complicated enough already.
2830 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2832 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
2836 log_error(LOG_LEVEL_ERROR,
2837 "Didn't receive data in time: %s", http->url);
2838 if ((byte_count == 0) && (http->ssl == 0))
2840 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2841 strlen(CONNECTION_TIMEOUT_RESPONSE));
2843 mark_server_socket_tainted(csp);
2848 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2849 mark_server_socket_tainted(csp);
2854 * This is the body of the browser's request,
2855 * just read and write it.
2857 if (FD_ISSET(csp->cfd, &rfds))
2859 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2863 /* XXX: not sure if this is necessary. */
2864 mark_server_socket_tainted(csp);
2865 break; /* "game over, man" */
2868 if (write_socket(csp->sfd, buf, (size_t)len))
2870 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2871 mark_server_socket_tainted(csp);
2878 * The server wants to talk. It could be the header or the body.
2879 * If `hdr' is null, then it's the header otherwise it's the body.
2880 * FIXME: Does `hdr' really mean `host'? No.
2882 if (FD_ISSET(csp->sfd, &rfds))
2885 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2889 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2891 if (http->ssl && (fwd->forward_host == NULL))
2894 * Just hang up. We already confirmed the client's CONNECT
2895 * request with status code 200 and unencrypted content is
2896 * no longer welcome.
2898 log_error(LOG_LEVEL_ERROR,
2899 "CONNECT already confirmed. Unable to tell the client about the problem.");
2902 else if (byte_count)
2905 * Just hang up. We already transmitted the original headers
2906 * and parts of the original content and therefore missed the
2907 * chance to send an error message (without risking data corruption).
2909 * XXX: we could retry with a fancy range request here.
2911 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2912 "Unable to tell the client about the problem.");
2913 mark_server_socket_tainted(csp);
2917 rsp = error_response(csp, "connect-failed", errno);
2920 send_crunch_response(csp, rsp);
2926 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2927 if (csp->flags & CSP_FLAG_CHUNKED)
2929 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
2931 /* XXX: this is a temporary hack */
2932 log_error(LOG_LEVEL_CONNECT,
2933 "Looks like we reached the end of the last chunk. "
2934 "We better stop reading.");
2935 csp->expected_content_length = byte_count + (size_t)len;
2936 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2940 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2943 * Add a trailing zero to let be able to use string operations.
2944 * XXX: do we still need this with filter_popups gone?
2949 * Normally, this would indicate that we've read
2950 * as much as the server has sent us and we can
2951 * close the client connection. However, Microsoft
2952 * in its wisdom has released IIS/5 with a bug that
2953 * prevents it from sending the trailing \r\n in
2954 * a 302 redirect header (and possibly other headers).
2955 * To work around this if we've haven't parsed
2956 * a full header we'll append a trailing \r\n
2957 * and see if this now generates a valid one.
2959 * This hack shouldn't have any impacts. If we've
2960 * already transmitted the header or if this is a
2961 * SSL connection, then we won't bother with this
2962 * hack. So we only work on partially received
2963 * headers. If we append a \r\n and this still
2964 * doesn't generate a valid header, then we won't
2965 * transmit anything to the client.
2970 if (server_body || http->ssl)
2973 * If we have been buffering up the document,
2974 * now is the time to apply content modification
2975 * and send the result to the client.
2979 p = execute_content_filter(csp, content_filter);
2981 * If the content filter fails, use the original
2982 * buffer and length.
2983 * (see p != NULL ? p : csp->iob->cur below)
2987 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2990 if (JB_ERR_OK != update_server_headers(csp))
2992 log_error(LOG_LEVEL_FATAL,
2993 "Failed to update server headers. after filtering.");
2996 hdr = list_to_text(csp->headers);
2999 /* FIXME Should handle error properly */
3000 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3003 if (write_socket(csp->cfd, hdr, strlen(hdr))
3004 || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
3006 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3009 mark_server_socket_tainted(csp);
3017 break; /* "game over, man" */
3021 * This is NOT the body, so
3022 * Let's pretend the server just sent us a blank line.
3024 snprintf(buf, sizeof(buf), "\r\n");
3025 len = (int)strlen(buf);
3028 * Now, let the normal header parsing algorithm below do its
3029 * job. If it fails, we'll exit instead of continuing.
3036 * If this is an SSL connection or we're in the body
3037 * of the server document, just write it to the client,
3038 * unless we need to buffer the body for later content-filtering
3040 if (server_body || http->ssl)
3045 * If there is no memory left for buffering the content, or the buffer limit
3046 * has been reached, switch to non-filtering mode, i.e. make & write the
3047 * header, flush the iob and buf, and get out of the way.
3049 if (add_to_iob(csp, buf, len))
3054 log_error(LOG_LEVEL_INFO,
3055 "Flushing header and buffers. Stepping back from filtering.");
3057 hdr = list_to_text(csp->headers);
3061 * Memory is too tight to even generate the header.
3062 * Send our static "Out-of-memory" page.
3064 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3065 rsp = cgi_error_memory();
3066 send_crunch_response(csp, rsp);
3067 mark_server_socket_tainted(csp);
3070 hdrlen = strlen(hdr);
3072 if (write_socket(csp->cfd, hdr, hdrlen)
3073 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
3074 || (write_socket(csp->cfd, buf, (size_t)len)))
3076 log_error(LOG_LEVEL_CONNECT,
3077 "Flush header and buffers to client failed: %E");
3079 mark_server_socket_tainted(csp);
3084 * Reset the byte_count to the amount of bytes
3085 * we just flushed. len will be added a few lines below,
3086 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3088 byte_count = (size_t)flushed;
3090 content_filter = NULL;
3096 if (write_socket(csp->cfd, buf, (size_t)len))
3098 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3099 mark_server_socket_tainted(csp);
3103 byte_count += (size_t)len;
3108 const char *header_start;
3110 * We're still looking for the end of the server's header.
3111 * Buffer up the data we just read. If that fails, there's
3112 * little we can do but send our static out-of-memory page.
3114 if (add_to_iob(csp, buf, len))
3116 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3117 rsp = cgi_error_memory();
3118 send_crunch_response(csp, rsp);
3119 mark_server_socket_tainted(csp);
3123 header_start = csp->iob->cur;
3125 /* Convert iob into something sed() can digest */
3126 if (JB_ERR_PARSE == get_server_headers(csp))
3131 * Well, we tried our MS IIS/5 hack and it didn't work.
3132 * The header is incomplete and there isn't anything
3133 * we can do about it.
3135 log_error(LOG_LEVEL_INFO,
3136 "MS IIS5 hack didn't produce valid headers.");
3142 * Since we have to wait for more from the server before
3143 * we can parse the headers we just continue here.
3145 int header_offset = csp->iob->cur - header_start;
3146 assert(csp->iob->cur >= header_start);
3147 byte_count += (size_t)(len - header_offset);
3148 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
3149 "byte_count: %u. header_offset: %d. len: %d.",
3150 byte_count, header_offset, len);
3155 /* Did we actually get anything? */
3156 if (NULL == csp->headers->first)
3158 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
3159 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3160 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
3161 free_http_request(http);
3162 mark_server_socket_tainted(csp);
3166 assert(csp->headers->first->str);
3168 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3169 strncmpic(csp->headers->first->str, "ICY", 3))
3172 * It doesn't look like a HTTP (or Shoutcast) response:
3173 * tell the client and log the problem.
3175 if (strlen(csp->headers->first->str) > 30)
3177 csp->headers->first->str[30] = '\0';
3179 log_error(LOG_LEVEL_ERROR,
3180 "Invalid server or forwarder response. Starts with: %s",
3181 csp->headers->first->str);
3182 log_error(LOG_LEVEL_CLF,
3183 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3184 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3185 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3186 free_http_request(http);
3187 mark_server_socket_tainted(csp);
3192 * We have now received the entire server header,
3193 * filter it and send the result to the client
3195 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3197 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
3199 hdr = list_to_text(csp->headers);
3202 /* FIXME Should handle error properly */
3203 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3206 if (crunch_response_triggered(csp, crunchers_light))
3209 * One of the tags created by a server-header
3210 * tagger triggered a crunch. We already
3211 * delivered the crunch response to the client
3212 * and are done here after cleaning up.
3215 mark_server_socket_tainted(csp);
3218 /* Buffer and pcrs filter this if appropriate. */
3220 if (!http->ssl) /* We talk plaintext */
3222 content_filter = get_filter_function(csp);
3225 * Only write if we're not buffering for content modification
3227 if (!content_filter)
3230 * Write the server's (modified) header to
3231 * the client (along with anything else that
3232 * may be in the buffer)
3235 if (write_socket(csp->cfd, hdr, strlen(hdr))
3236 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
3238 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
3241 * The write failed, so don't bother mentioning it
3242 * to the client... it probably can't hear us anyway.
3245 mark_server_socket_tainted(csp);
3249 byte_count += (size_t)len;
3254 * XXX: the header lenght should probably
3255 * be calculated by get_server_headers().
3257 int header_length = csp->iob->cur - header_start;
3258 assert(csp->iob->cur > header_start);
3259 byte_count += (size_t)(len - header_length);
3262 /* we're finished with the server's header */
3268 * If this was a MS IIS/5 hack then it means the server
3269 * has already closed the connection. Nothing more to read.
3274 log_error(LOG_LEVEL_INFO,
3275 "Closed server connection detected with MS IIS5 hack enabled.");
3281 mark_server_socket_tainted(csp);
3282 return; /* huh? we should never get here */
3285 if (csp->content_length == 0)
3288 * If Privoxy didn't recalculate the Content-Lenght,
3289 * byte_count is still correct.
3291 csp->content_length = byte_count;
3294 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3295 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3296 && (csp->expected_content_length != byte_count))
3298 log_error(LOG_LEVEL_CONNECT,
3299 "Received %u bytes while expecting %u.",
3300 byte_count, csp->expected_content_length);
3301 mark_server_socket_tainted(csp);
3305 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %u",
3306 csp->ip_addr_str, http->ocmd, csp->content_length);
3310 /*********************************************************************
3314 * Description : This is little more than chat. We only "serve" to
3315 * to close any socket that chat may have opened.
3318 * 1 : csp = Current client state (buffers, headers, etc...)
3322 *********************************************************************/
3324 void serve(struct client_state *csp)
3325 #else /* ifndef AMIGA */
3326 static void serve(struct client_state *csp)
3327 #endif /* def AMIGA */
3330 close_socket(csp->cfd);
3332 if (csp->sfd != JB_INVALID_SOCKET)
3334 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3335 static int monitor_thread_running = 0;
3337 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
3338 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
3340 remember_connection(csp->sfd, csp->http, forward_url(csp, csp->http));
3341 privoxy_mutex_lock(&connection_reuse_mutex);
3342 if (!monitor_thread_running)
3344 monitor_thread_running = 1;
3345 privoxy_mutex_unlock(&connection_reuse_mutex);
3346 wait_for_alive_connections();
3347 privoxy_mutex_lock(&connection_reuse_mutex);
3348 monitor_thread_running = 0;
3350 privoxy_mutex_unlock(&connection_reuse_mutex);
3354 forget_connection(csp->sfd);
3355 close_socket(csp->sfd);
3358 close_socket(csp->sfd);
3359 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3362 csp->flags &= ~CSP_FLAG_ACTIVE;
3368 /*********************************************************************
3370 * Function : server_thread
3372 * Description : We only exist to call `serve' in a threaded environment.
3375 * 1 : data = Current client state (buffers, headers, etc...)
3377 * Returns : Always 0.
3379 *********************************************************************/
3380 static int32 server_thread(void *data)
3382 serve((struct client_state *) data);
3389 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3390 /*********************************************************************
3394 * Description : Print usage info & exit.
3396 * Parameters : Pointer to argv[0] for identifying ourselves
3400 *********************************************************************/
3401 static void usage(const char *myname)
3403 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
3407 #endif /* defined(unix) */
3410 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
3411 #endif /* defined(unix) */
3412 "[--version] [configfile]\n"
3413 "Aborting\n", myname);
3418 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
3421 #ifdef MUTEX_LOCKS_AVAILABLE
3422 /*********************************************************************
3424 * Function : privoxy_mutex_lock
3426 * Description : Locks a mutex.
3429 * 1 : mutex = The mutex to lock.
3431 * Returns : Void. May exit in case of errors.
3433 *********************************************************************/
3434 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
3436 #ifdef FEATURE_PTHREAD
3437 int err = pthread_mutex_lock(mutex);
3440 if (mutex != &log_mutex)
3442 log_error(LOG_LEVEL_FATAL,
3443 "Mutex locking failed: %s.\n", strerror(err));
3448 EnterCriticalSection(mutex);
3449 #endif /* def FEATURE_PTHREAD */
3453 /*********************************************************************
3455 * Function : privoxy_mutex_unlock
3457 * Description : Unlocks a mutex.
3460 * 1 : mutex = The mutex to unlock.
3462 * Returns : Void. May exit in case of errors.
3464 *********************************************************************/
3465 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
3467 #ifdef FEATURE_PTHREAD
3468 int err = pthread_mutex_unlock(mutex);
3471 if (mutex != &log_mutex)
3473 log_error(LOG_LEVEL_FATAL,
3474 "Mutex unlocking failed: %s.\n", strerror(err));
3479 LeaveCriticalSection(mutex);
3480 #endif /* def FEATURE_PTHREAD */
3484 /*********************************************************************
3486 * Function : privoxy_mutex_init
3488 * Description : Prepares a mutex.
3491 * 1 : mutex = The mutex to initialize.
3493 * Returns : Void. May exit in case of errors.
3495 *********************************************************************/
3496 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
3498 #ifdef FEATURE_PTHREAD
3499 int err = pthread_mutex_init(mutex, 0);
3502 printf("Fatal error. Mutex initialization failed: %s.\n",
3507 InitializeCriticalSection(mutex);
3508 #endif /* def FEATURE_PTHREAD */
3510 #endif /* def MUTEX_LOCKS_AVAILABLE */
3512 /*********************************************************************
3514 * Function : initialize_mutexes
3516 * Description : Prepares mutexes if mutex support is available.
3520 * Returns : Void, exits in case of errors.
3522 *********************************************************************/
3523 static void initialize_mutexes(void)
3525 #ifdef MUTEX_LOCKS_AVAILABLE
3527 * Prepare global mutex semaphores
3529 privoxy_mutex_init(&log_mutex);
3530 privoxy_mutex_init(&log_init_mutex);
3531 privoxy_mutex_init(&connection_reuse_mutex);
3534 * XXX: The assumptions below are a bit naive
3535 * and can cause locks that aren't necessary.
3537 * For example older FreeBSD versions (< 6.x?)
3538 * have no gethostbyname_r, but gethostbyname is
3541 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
3542 privoxy_mutex_init(&resolver_mutex);
3543 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
3545 * XXX: should we use a single mutex for
3546 * localtime() and gmtime() as well?
3548 #ifndef HAVE_GMTIME_R
3549 privoxy_mutex_init(&gmtime_mutex);
3550 #endif /* ndef HAVE_GMTIME_R */
3552 #ifndef HAVE_LOCALTIME_R
3553 privoxy_mutex_init(&localtime_mutex);
3554 #endif /* ndef HAVE_GMTIME_R */
3557 privoxy_mutex_init(&rand_mutex);
3558 #endif /* ndef HAVE_RANDOM */
3559 #endif /* def MUTEX_LOCKS_AVAILABLE */
3563 /*********************************************************************
3567 * Description : Load the config file and start the listen loop.
3568 * This function is a lot more *sane* with the `load_config'
3569 * and `listen_loop' functions; although it stills does
3570 * a *little* too much for my taste.
3573 * 1 : argc = Number of parameters (including $0).
3574 * 2 : argv = Array of (char *)'s to the parameters.
3576 * Returns : 1 if : can't open config file, unrecognized directive,
3577 * stats requested in multi-thread mode, can't open the
3578 * log file, can't open the jar file, listen port is invalid,
3579 * any load fails, and can't bind port.
3581 * Else main never returns, the process must be signaled
3582 * to terminate execution. Or, on Windows, use the
3583 * "File", "Exit" menu option.
3585 *********************************************************************/
3587 int real_main(int argc, const char *argv[])
3589 int main(int argc, const char *argv[])
3593 unsigned int random_seed;
3595 struct passwd *pw = NULL;
3596 struct group *grp = NULL;
3599 char *pre_chroot_nslookup_to_load_resolver = NULL;
3606 #if !defined(_WIN32)
3613 /* Prepare mutexes if supported and necessary. */
3614 initialize_mutexes();
3616 /* Enable logging until further notice. */
3620 * Parse the command line arguments
3622 * XXX: simply printing usage information in case of
3623 * invalid arguments isn't particularly user friendly.
3625 while (++argc_pos < argc)
3628 /* Check to see if the service must be installed or uninstalled */
3629 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3631 const char *pName = argv[argc_pos] + 9;
3634 exit( (install_service(pName)) ? 0 : 1 );
3636 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3638 const char *pName = argv[argc_pos] + 11;
3641 exit((uninstall_service(pName)) ? 0 : 1);
3643 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3645 bRunAsService = TRUE;
3646 w32_set_service_cwd();
3647 atexit(w32_service_exit_notify);
3650 #endif /* defined(_WIN32) */
3653 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3655 if (strcmp(argv[argc_pos], "--help") == 0)
3660 else if(strcmp(argv[argc_pos], "--version") == 0)
3662 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3668 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3673 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3675 if (++argc_pos == argc) usage(argv[0]);
3676 pidfile = strdup(argv[argc_pos]);
3679 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3681 if (++argc_pos == argc) usage(argv[argc_pos]);
3683 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3686 if (NULL == (grp = getgrnam(p)))
3688 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3692 if (NULL == (pw = getpwnam(argv[argc_pos])))
3694 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3697 if (p != NULL) *--p = '\0';
3700 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3702 if (++argc_pos == argc) usage(argv[0]);
3703 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3706 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3710 #endif /* defined(unix) */
3712 else if (argc_pos + 1 != argc)
3715 * This is neither the last command line
3716 * option, nor was it recognized before,
3717 * therefore it must be invalid.
3723 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3725 configfile = argv[argc_pos];
3728 } /* -END- while (more arguments) */
3730 show_version(Argv[0]);
3733 if ( *configfile != '/' )
3735 char cwd[BUFFER_SIZE];
3737 size_t abs_file_size;
3739 /* make config-filename absolute here */
3740 if (NULL == getcwd(cwd, sizeof(cwd)))
3742 perror("failed to get current working directory");
3747 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3748 basedir = strdup(cwd);
3750 if (NULL == basedir ||
3751 NULL == (abs_file = malloc(abs_file_size)))
3753 perror("malloc failed");
3756 strlcpy(abs_file, basedir, abs_file_size);
3757 strlcat(abs_file, "/", abs_file_size );
3758 strlcat(abs_file, configfile, abs_file_size);
3759 configfile = abs_file;
3761 #endif /* defined unix */
3765 clients->next = NULL;
3767 /* XXX: factor out initialising after the next stable release. */
3770 #elif defined(_WIN32)
3774 random_seed = (unsigned int)time(NULL);
3776 srandom(random_seed);
3779 #endif /* ifdef HAVE_RANDOM */
3782 * Unix signal handling
3784 * Catch the abort, interrupt and terminate signals for a graceful exit
3785 * Catch the hangup signal so the errlog can be reopened.
3786 * Ignore the broken pipe signals (FIXME: Why?)
3788 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3791 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3792 const int ignored_signals[] = { SIGPIPE, 0 };
3794 for (idx = 0; catched_signals[idx] != 0; idx++)
3796 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3797 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3799 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3800 #endif /* ifdef sun */
3802 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3806 for (idx = 0; ignored_signals[idx] != 0; idx++)
3808 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3810 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3815 #else /* ifdef _WIN32 */
3816 # ifdef _WIN_CONSOLE
3818 * We *are* in a windows console app.
3819 * Print a verbose messages about FAQ's and such
3821 printf("%s", win32_blurb);
3822 # endif /* def _WIN_CONSOLE */
3823 #endif /* def _WIN32 */
3826 /* Initialize the CGI subsystem */
3827 cgi_init_error_messages();
3830 * If runnig on unix and without the --nodaemon
3831 * option, become a daemon. I.e. fork, detach
3832 * from tty and get process group leadership
3845 if ( pid < 0 ) /* error */
3850 else if ( pid != 0 ) /* parent */
3855 * must check for errors
3856 * child died due to missing files aso
3859 wpid = waitpid( pid, &status, WNOHANG );
3868 /* Should be more portable, but not as well tested */
3873 #else /* ndef __FreeBSD__ */
3875 #endif /* ndef __FreeBSD__ */
3876 fd = open("/dev/tty", O_RDONLY);
3879 /* no error check here */
3880 ioctl( fd, TIOCNOTTY,0 );
3885 * stderr (fd 2) will be closed later on, when the
3886 * log file has been parsed.
3893 } /* -END- if (!no_daemon) */
3896 * As soon as we have written the PID file, we can switch
3897 * to the user and group ID indicated by the --user option
3903 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3905 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3909 if (setgroups(1, &grp->gr_gid))
3911 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
3914 else if (initgroups(pw->pw_name, pw->pw_gid))
3916 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
3922 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3924 /* Read the time zone file from /etc before doing chroot. */
3926 if (NULL != pre_chroot_nslookup_to_load_resolver
3927 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3929 /* Initialize resolver library. */
3930 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3932 if (chroot(pw->pw_dir) < 0)
3934 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3938 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3941 if (setuid(pw->pw_uid))
3943 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3947 char putenv_dummy[64];
3949 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3950 if (putenv(putenv_dummy) != 0)
3952 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3955 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3956 if (putenv(putenv_dummy) != 0)
3958 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3964 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3967 #endif /* defined unix */
3970 /* This will be FALSE unless the command line specified --service
3974 /* Yup, so now we must attempt to establish a connection
3975 * with the service dispatcher. This will only work if this
3976 * process was launched by the service control manager to
3977 * actually run as a service. If this isn't the case, i've
3978 * known it take around 30 seconds or so for the call to return.
3981 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3982 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3984 /* Service has run, and at this point is now being stopped, so just return */
3989 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3991 /* An error occurred. Usually it's because --service was wrongly specified
3992 * and we were unable to connect to the Service Control Dispatcher because
3993 * it wasn't expecting us and is therefore not listening.
3995 * For now, just continue below to call the listen_loop function.
3998 #endif /* def _WIN32 */
4008 /*********************************************************************
4010 * Function : bind_port_helper
4012 * Description : Bind the listen port. Handles logging, and aborts
4016 * 1 : config = Privoxy configuration. Specifies port
4019 * Returns : Port that was opened.
4021 *********************************************************************/
4022 static jb_socket bind_port_helper(struct configuration_spec * config)
4027 if (config->haddr == NULL)
4029 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
4034 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
4035 config->hport, config->haddr);
4038 result = bind_port(config->haddr, config->hport, &bfd);
4045 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4046 "There may be another Privoxy or some other "
4047 "proxy running on port %d",
4048 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
4049 config->hport, config->hport);
4052 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4053 "The hostname is not resolvable",
4054 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4057 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
4058 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4061 /* shouldn't get here */
4062 return JB_INVALID_SOCKET;
4065 config->need_bind = 0;
4072 /* Without this simple workaround we get this compiler warning from _beginthread
4073 * warning C4028: formal parameter 1 different from declaration
4075 void w32_service_listen_loop(void *p)
4079 #endif /* def _WIN32 */
4082 /*********************************************************************
4084 * Function : listen_loop
4086 * Description : bind the listen port and enter a "FOREVER" listening loop.
4092 *********************************************************************/
4093 static void listen_loop(void)
4095 struct client_state *csp = NULL;
4097 struct configuration_spec * config;
4099 config = load_config();
4101 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4103 * XXX: Should be relocated once it no
4104 * longer needs to emit log messages.
4106 initialize_reusable_connections();
4107 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4109 bfd = bind_port_helper(config);
4111 #ifdef FEATURE_GRACEFUL_TERMINATION
4112 while (!g_terminate)
4117 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
4118 while (waitpid(-1, NULL, WNOHANG) > 0)
4120 /* zombie children */
4122 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
4125 * Free data that was used by died threads
4131 * Re-open the errlog after HUP signal
4133 if (received_hup_signal)
4135 if (NULL != config->logfile)
4137 init_error_log(Argv[0], config->logfile);
4139 received_hup_signal = 0;
4143 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
4145 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
4149 csp->flags |= CSP_FLAG_ACTIVE;
4150 csp->sfd = JB_INVALID_SOCKET;
4152 csp->config = config = load_config();
4154 if ( config->need_bind )
4157 * Since we were listening to the "old port", we will not see
4158 * a "listen" param change until the next IJB request. So, at
4159 * least 1 more request must be made for us to find the new
4160 * setting. I am simply closing the old socket and binding the
4163 * Which-ever is correct, we will serve 1 more page via the
4164 * old settings. This should probably be a "show-proxy-args"
4165 * request. This should not be a so common of an operation
4166 * that this will hurt people's feelings.
4171 bfd = bind_port_helper(config);
4174 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
4176 if (!accept_connection(csp, bfd))
4178 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
4191 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
4194 #ifdef FEATURE_TOGGLE
4195 if (global_toggle_state)
4196 #endif /* def FEATURE_TOGGLE */
4198 csp->flags |= CSP_FLAG_TOGGLED_ON;
4201 if (run_loader(csp))
4203 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
4204 /* Never get here - LOG_LEVEL_FATAL causes program exit */
4208 if (block_acl(NULL,csp))
4210 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
4211 close_socket(csp->cfd);
4215 #endif /* def FEATURE_ACL */
4217 /* add it to the list of clients */
4218 csp->next = clients->next;
4219 clients->next = csp;
4221 if (config->multi_threaded)
4225 /* this is a switch () statment in the C preprocessor - ugh */
4226 #undef SELECTED_ONE_OPTION
4228 /* Use Pthreads in preference to native code */
4229 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
4230 #define SELECTED_ONE_OPTION
4232 pthread_t the_thread;
4233 pthread_attr_t attrs;
4235 pthread_attr_init(&attrs);
4236 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
4237 errno = pthread_create(&the_thread, &attrs,
4238 (void * (*)(void *))serve, csp);
4239 child_id = errno ? -1 : 0;
4240 pthread_attr_destroy(&attrs);
4244 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
4245 #define SELECTED_ONE_OPTION
4246 child_id = _beginthread(
4247 (void (*)(void *))serve,
4252 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
4253 #define SELECTED_ONE_OPTION
4254 child_id = _beginthread(
4255 (void(* _Optlink)(void*))serve,
4261 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
4262 #define SELECTED_ONE_OPTION
4264 thread_id tid = spawn_thread
4265 (server_thread, "server", B_NORMAL_PRIORITY, csp);
4267 if ((tid >= 0) && (resume_thread(tid) == B_OK))
4269 child_id = (int) tid;
4278 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
4279 #define SELECTED_ONE_OPTION
4280 csp->cfd = ReleaseSocket(csp->cfd, -1);
4283 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4284 NP_Output, Output(),
4285 NP_CloseOutput, FALSE,
4286 NP_Name, (ULONG)"privoxy child",
4290 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4291 NP_Output, Output(),
4292 NP_CloseOutput, FALSE,
4293 NP_Name, (ULONG)"privoxy child",
4294 NP_StackSize, 200*1024,
4300 ((struct Task *)child_id)->tc_UserData = csp;
4301 Signal((struct Task *)child_id, SIGF_SINGLE);
4306 #if !defined(SELECTED_ONE_OPTION)
4309 /* This block is only needed when using fork().
4310 * When using threads, the server thread was
4311 * created and run by the call to _beginthread().
4313 if (child_id == 0) /* child */
4316 #ifdef FEATURE_TOGGLE
4317 int inherited_toggle_state = global_toggle_state;
4318 #endif /* def FEATURE_TOGGLE */
4323 * If we've been toggled or we've blocked the request, tell Mom
4326 #ifdef FEATURE_TOGGLE
4327 if (inherited_toggle_state != global_toggle_state)
4329 rc |= RC_FLAG_TOGGLED;
4331 #endif /* def FEATURE_TOGGLE */
4333 #ifdef FEATURE_STATISTICS
4334 if (csp->flags & CSP_FLAG_REJECTED)
4336 rc |= RC_FLAG_BLOCKED;
4338 #endif /* ndef FEATURE_STATISTICS */
4342 else if (child_id > 0) /* parent */
4344 /* in a fork()'d environment, the parent's
4345 * copy of the client socket and the CSP
4349 #if !defined(_WIN32) && !defined(__CYGWIN__)
4351 wait( &child_status );
4354 * Evaluate child's return code: If the child has
4355 * - been toggled, toggle ourselves
4356 * - blocked its request, bump up the stats counter
4359 #ifdef FEATURE_TOGGLE
4360 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
4362 global_toggle_state = !global_toggle_state;
4364 #endif /* def FEATURE_TOGGLE */
4366 #ifdef FEATURE_STATISTICS
4368 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
4372 #endif /* def FEATURE_STATISTICS */
4374 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
4375 close_socket(csp->cfd);
4376 csp->flags &= ~CSP_FLAG_ACTIVE;
4380 #undef SELECTED_ONE_OPTION
4381 /* end of cpp switch () */
4383 if (child_id < 0) /* failed */
4385 char buf[BUFFER_SIZE];
4387 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
4389 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
4391 write_socket(csp->cfd, buf, strlen(buf));
4392 close_socket(csp->cfd);
4393 csp->flags &= ~CSP_FLAG_ACTIVE;
4404 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
4406 /* Clean up. Aim: free all memory (no leaks) */
4407 #ifdef FEATURE_GRACEFUL_TERMINATION
4409 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
4411 unload_current_config_file();
4412 unload_current_actions_file();
4413 unload_current_re_filterfile();
4414 #ifdef FEATURE_TRUST
4415 unload_current_trust_file();
4418 if (config->multi_threaded)
4425 } while ((clients->next != NULL) && (--i > 0));
4429 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
4440 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
4441 /* Cleanup - remove taskbar icon etc. */
4446 #endif /* FEATURE_GRACEFUL_TERMINATION */