1 const char jcc_rcs[] = "$Id: jcc.c,v 1.233 2009/03/13 14:10:07 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 1.233 2009/03/13 14:10:07 fabiankeil
37 * Fix some more harmless warnings on amd64.
39 * Revision 1.232 2009/03/08 19:29:16 fabiankeil
40 * Reinitialize the timeout structure every time before passing
41 * it to select(). Apparently some implementations mess with it.
42 * Probably fixes #2669131 reported by cyberpatrol.
44 * Revision 1.231 2009/03/08 14:19:23 fabiankeil
45 * Fix justified (but harmless) compiler warnings
46 * on platforms where sizeof(int) < sizeof(long).
48 * Revision 1.230 2009/03/07 13:09:17 fabiankeil
49 * Change csp->expected_content and_csp->expected_content_length from
50 * size_t to unsigned long long to reduce the likelihood of integer
51 * overflows that would let us close the connection prematurely.
52 * Bug found while investigating #2669131, reported by cyberpatrol.
54 * Revision 1.229 2009/03/07 11:17:01 fabiankeil
55 * Fix compiler warning.
57 * Revision 1.228 2009/03/06 20:30:13 fabiankeil
58 * Log unsigned values as such.
60 * Revision 1.227 2009/03/02 19:18:11 fabiankeil
61 * Streamline parse_http_request()'s prototype. As
62 * cparser pointed out it doesn't actually use csp.
64 * Revision 1.226 2009/03/01 18:28:24 fabiankeil
65 * Help clang understand that we aren't dereferencing
68 * Revision 1.225 2009/02/19 18:09:32 fabiankeil
69 * Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
72 * Revision 1.224 2009/02/14 15:32:04 fabiankeil
73 * Add the request URL to the timeout message in chat().
76 * Revision 1.223 2009/02/09 21:21:16 fabiankeil
77 * Now that init_log_module() is called earlier, call show_version()
78 * later on from main() directly so it doesn't get called for --help
81 * Revision 1.222 2009/02/08 12:56:51 fabiankeil
82 * Call initialize_mutexes() before init_log_module() again.
83 * Broken since r220, might be the cause of Lee's #2579448.
85 * Revision 1.221 2009/02/06 18:02:58 fabiankeil
86 * When dropping privileges, also give up membership in supplementary
87 * groups. Thanks to Matthias Drochner for reporting the problem,
88 * providing the initial patch and testing the final version.
90 * Revision 1.220 2009/02/04 18:29:07 fabiankeil
91 * Initialize the log module before parsing arguments.
92 * Thanks to Matthias Drochner for the report.
94 * Revision 1.219 2009/01/31 16:08:21 fabiankeil
95 * Remove redundant error check in receive_client_request().
97 * Revision 1.218 2009/01/31 12:25:54 fabiankeil
98 * Flatten indentation in receive_client_request().
100 * Revision 1.217 2009/01/07 19:50:09 fabiankeil
101 * - If the socket-timeout has been reached and the client
102 * hasn't received any data yet, send an explanation before
103 * closing the connection.
104 * - In get_request_line(), signal timeouts the right way.
106 * Revision 1.216 2008/12/24 22:13:11 ler762
107 * fix GCC 3.4.4 warning
109 * Revision 1.215 2008/12/24 17:06:19 fabiankeil
110 * Keep a thread around to timeout alive connections
111 * even if no new requests are coming in.
113 * Revision 1.214 2008/12/20 14:53:55 fabiankeil
114 * Add config option socket-timeout to control the time
115 * Privoxy waits for data to arrive on a socket. Useful
116 * in case of stale ssh tunnels or when fuzz-testing.
118 * Revision 1.213 2008/12/15 18:45:51 fabiankeil
119 * When logging crunches, log the whole URL, so one can easily
120 * differentiate between vanilla HTTP and CONNECT requests.
122 * Revision 1.212 2008/12/14 15:46:22 fabiankeil
123 * Give crunched requests their own log level.
125 * Revision 1.211 2008/12/06 10:05:03 fabiankeil
126 * Downgrade "Received x bytes while expecting y." message to
127 * LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
129 * Revision 1.210 2008/12/02 22:03:18 fabiankeil
130 * Don't miscalculate byte_count if we don't get all the
131 * server headers with one read_socket() call. With keep-alive
132 * support enabled, this caused delays until the server closed
135 * Revision 1.209 2008/11/27 09:44:04 fabiankeil
136 * Cosmetics for the last commit: Don't watch out for
137 * the last chunk if the content isn't chunk-encoded or
138 * if we already determined the content length previously.
140 * Revision 1.208 2008/11/26 18:24:17 fabiankeil
141 * Recognize that the server response is complete if the
142 * last chunk is read together with the server headers.
145 * Revision 1.207 2008/11/25 17:25:16 fabiankeil
146 * Don't convert the client-header list to text until we need to.
148 * Revision 1.206 2008/11/23 17:00:11 fabiankeil
149 * Some more chat() cosmetics.
151 * Revision 1.205 2008/11/16 12:43:49 fabiankeil
152 * Turn keep-alive support into a runtime feature
153 * that is disabled by setting keep-alive-timeout
154 * to a negative value.
156 * Revision 1.204 2008/11/06 19:42:17 fabiankeil
157 * Fix last-chunk detection hack to also apply
158 * if buf[] contains nothing but the last-chunk.
160 * Revision 1.203 2008/11/06 18:34:35 fabiankeil
161 * Factor receive_client_request() and
162 * parse_client_request() out of chat().
164 * Revision 1.202 2008/11/02 18:40:34 fabiankeil
165 * If we received a different amount of data than we expected,
166 * log a warning and make sure the server socket isn't reused.
168 * Revision 1.201 2008/11/02 16:48:20 fabiankeil
169 * Revert revision 1.195 and try again.
171 * Revision 1.200 2008/10/26 16:53:18 fabiankeil
174 * Revision 1.199 2008/10/26 15:36:10 fabiankeil
175 * Remove two debug messages with LOG_LEVEL_INFO.
177 * Revision 1.198 2008/10/22 15:19:55 fabiankeil
178 * Once More, With Feeling: if there is no logfile
179 * because the user didn't specify one, we shouldn't
180 * call init_error_log() after receiving SIGHUP either.
182 * Revision 1.197 2008/10/20 17:02:40 fabiankeil
183 * If SIGHUP is received while we aren't running in daemon
184 * mode, calling init_error_log() would be a mistake.
186 * Revision 1.196 2008/10/16 09:16:41 fabiankeil
187 * - Fix two gcc44 conversion warnings.
188 * - Don't bother logging the last five bytes
191 * Revision 1.195 2008/10/13 16:04:37 fabiankeil
192 * Make sure we don't try to reuse tainted server sockets.
194 * Revision 1.194 2008/10/12 18:35:18 fabiankeil
195 * The last commit was a bit too ambitious, apparently the content
196 * length adjustment is only necessary if we aren't buffering.
198 * Revision 1.193 2008/10/12 15:57:35 fabiankeil
199 * Fix content length calculation if we read headers
200 * and the start of the body at once. Now that we have
201 * FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
203 * Revision 1.192 2008/10/11 18:19:14 fabiankeil
204 * Even more chat() cosmetics.
206 * Revision 1.191 2008/10/11 18:00:14 fabiankeil
207 * Reformat some comments in chat().
209 * Revision 1.190 2008/10/11 14:58:00 fabiankeil
210 * In case of chunk-encoded content, stop reading if
211 * the buffer looks like it ends with the last chunk.
213 * Revision 1.189 2008/10/11 09:53:00 fabiankeil
214 * Let server_response_is_complete() deal properly with
215 * content that is neither buffered nor read all at once.
217 * Revision 1.188 2008/10/09 18:21:41 fabiankeil
218 * Flush work-in-progress changes to keep outgoing connections
219 * alive where possible. Incomplete and mostly #ifdef'd out.
221 * Revision 1.187 2008/09/07 12:35:05 fabiankeil
222 * Add mutex lock support for _WIN32.
224 * Revision 1.186 2008/09/04 08:13:58 fabiankeil
225 * Prepare for critical sections on Windows by adding a
226 * layer of indirection before the pthread mutex functions.
228 * Revision 1.185 2008/08/30 12:03:07 fabiankeil
229 * Remove FEATURE_COOKIE_JAR.
231 * Revision 1.184 2008/08/22 15:34:45 fabiankeil
232 * - Silence LLVM/Clang complaint.
233 * - Make received_hup_signal static.
234 * - Hide definitions for basedir, pidfile and received_hup_signal
235 * from __EMX__ as they only seem to be used in case of #ifdef unix.
237 * Revision 1.183 2008/08/21 07:09:35 fabiankeil
238 * Accept Shoutcast responses again. Problem reported
239 * and fix suggested by Stefan in #2062860.
241 * Revision 1.182 2008/06/27 11:13:56 fabiankeil
242 * Fix possible NULL-pointer dereference reported
243 * by din_a4 in #2003937. Pointy hat to me.
245 * Revision 1.181 2008/05/21 15:47:15 fabiankeil
246 * Streamline sed()'s prototype and declare
247 * the header parse and add structures static.
249 * Revision 1.180 2008/05/21 15:26:32 fabiankeil
250 * - Mark csp as immutable for send_crunch_response().
251 * - Fix comment spelling.
253 * Revision 1.179 2008/05/20 20:13:32 fabiankeil
254 * Factor update_server_headers() out of sed(), ditch the
255 * first_run hack and make server_patterns_light static.
257 * Revision 1.178 2008/05/10 13:23:38 fabiankeil
258 * Don't provide get_header() with the whole client state
259 * structure when it only needs access to csp->iob.
261 * Revision 1.177 2008/05/10 11:51:12 fabiankeil
262 * Make the "read the rest of the headers" loop a bit more readable.
264 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
265 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
266 * - Remove useless comment.
268 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
269 * Fix comment grammar.
271 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
272 * Remove the pointless buffer in client_protocol_is_unsupported().
274 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
275 * Least-effort fix for bug #1821930 (reported by Lee):
276 * If the response doesn't look like HTTP,
277 * tell the client and log the problem.
279 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
280 * Don't pass the whole csp structure to flush_socket()
281 * when it only needs a file descriptor and a buffer.
283 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
284 * Remove kill-popups action.
286 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
287 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
289 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
290 * Remove the treat-forbidden-connects-like-blocks action. We now
291 * use the "blocked" page for forbidden CONNECT requests by default.
293 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
294 * Also use shiny new connect_port_is_forbidden() in jcc.c.
296 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
297 * Rename url_actions() to get_url_actions() and let it
298 * use the standard parameter ordering.
300 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
301 * Let forward_url() use the standard parameter ordering
302 * and mark its second parameter immutable.
304 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
305 * Remove the "Listening ... for local connections only" log message.
306 * Whether or not remote connections are able to reach Privoxy is up
307 * to the operating system.
309 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
310 * Prevent the log messages for CONNECT requests to unacceptable
311 * ports from printing the limit-connect argument as [null] if
312 * limit-connect hasn't been explicitly enabled.
314 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
315 * Make sure all console-mode apps get a usage() instance
317 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
318 * Reword NO_SERVER_DATA_RESPONSE to make it harder
319 * to misunderstand what the message is all about.
321 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
322 * Unbreak trustfile which previously didn't work without
323 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
325 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
326 * Plug memory leak. Spotted by Valgrind, triggered by
327 * Privoxy-Regression-Test feeding proxyfuzz.py.
329 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
330 * In the HTTP snipplets, refer to the client as client.
332 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
333 * Emit a log message when activating the MS IIS5 hack.
335 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
336 * Log the "weak randomization factor" warning only
337 * once for mingw32 and provide some more details.
339 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
340 * Initialize log module after initializing mutexes, future
341 * deadlocks in that code should now work cross-platform.
343 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
344 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
345 * Reported by Bert van Leeuwen in BR#1818808.
347 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
348 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
350 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
351 * When in daemon mode, close stderr after the configuration file has been
352 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
354 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
355 * - Fix a crash when parsing invalid requests whose first header
356 * is rejected by get_header(). Regression (re?)introduced
357 * in r1.143 by yours truly.
358 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
359 * client_cookie_adder() to make sure send-vanilla-wafer can be
360 * controlled through tags (and thus regression-tested).
362 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
363 * - Move get_filter_function() from jcc.c to filters.c
364 * so the filter functions can be static.
365 * - Don't bother filtering body-less responses.
367 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
368 * Execute content filters through execute_content_filter().
370 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
371 * Initialize req to NULL to make sure it's defined if the
372 * first read_socket() call fails. Reported by icmp30.
374 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
375 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
376 * extensive comments moved to user manual.
378 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
379 * Don't crash if a broken header filter wiped out the request line.
381 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
382 * Fix byte_count calculation in case of flushes
383 * and don't parse the server headers a second time.
385 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
386 * - If there's a connection problem after we already forwarded
387 * parts of the original content, just hang up. Fixes BR#1776724.
388 * - Fix warnings about unused code on mingw32.
389 * - In case of flushes, calculate the byte count
390 * less incorrectly (I think).
392 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
393 * Add some more prototypes for static functions.
395 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
396 * Comment out request_contains_null_bytes() until it's used again.
398 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
399 * #1763173 from Stefan Huehner: s@const static@static const@
400 * and declare some more functions static.
402 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
403 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
404 * and explain why they were rejected in the first place.
405 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
406 * CONNECT requests. The request line was missing.
407 * - Add two more XXX reminders as we don't have enough already.
409 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
410 * As Hal noticed, checking dispatch_cgi() as the last cruncher
411 * looks like a bug if CGI requests are blocked unintentionally,
412 * so don't do it unless the user enabled the new config option
413 * "allow-cgi-request-crunching".
415 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
416 * - Allow to rewrite the request destination behind the client's back.
417 * - Turn the weird-looking unconditional for loop that
418 * reads the client request into a conditional while loop.
419 * Move the stuff that only runs once out of the loop.
420 * - Move parts of chat(), server_content_type() and the
421 * necessary stuff to fix BR#1750917 into get_filter_function().
423 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
424 * Temporary workaround for BR#1730105.
426 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
427 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
428 * deadlocks and crashes on OpenBSD and possibly other OS with neither
429 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
430 * Thanks to Ralf Horstmann for report and solution.
432 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
433 * Add forward-override{} to change the forwarding settings through
434 * action sections. This is mainly interesting to forward different
435 * clients differently (for example based on User-Agent or request
438 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
439 * - Let usage() mention the --chroot parameter.
440 * - Use read_socket() consistently and always leave
441 * the last buffer byte alone, even in cases where
442 * null termination (currently) doesn't matter.
444 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
445 * - Fix config file loading on Unix if no config file is specified.
446 * Since r1.97 Privoxy would always interpret the last argument as
447 * config file, even if it's a valid command line option.
448 * - Abort in case of unrecognized command line options. Closes #1719696.
449 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
450 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
452 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
453 * - Don't rerun crunchers that only depend on the request URL.
454 * - Don't count redirects and CGI requests as "blocked requests".
456 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
457 * Support crunching based on tags created by server-header taggers.
459 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
460 * Make HTTP snippets static (again). Add a Content-Type for those
461 * with content so the browser doesn't guess it based on the URL.
463 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
464 * Move crunching and request line rebuilding out of chat().
466 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
467 * Introduce tags as alternative way to specify which
468 * actions apply to a request. At the moment tags can be
469 * created based on client and server headers.
471 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
472 * Don't CLF-log CONNECT requests twice.
474 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
475 * Log the source address for ACL-related connection drops.
477 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
478 * New config option: enforce-blocks.
480 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
481 * - Move null byte check into separate function.
482 * - Don't confuse the client with error pages
483 * if a CONNECT request was already confirmed.
485 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
486 * Speed up NULL byte escaping and only log the complete
487 * NULL byte requests with header debugging enabled.
489 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
490 * Answer requests that contain NULL bytes with
491 * a custom response instead of waiting for more
492 * data until the client eventually hangs up.
494 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
495 * - Move delivery and logging of crunched responses
496 * from chat() into send_crunch_response().
497 * - Display the reason for generating http_responses.
498 * - Log the content length for LOG_LEVEL_CLF correctly
499 * (still incorrect for some fixed responses).
500 * - Reword an incorrect comment about
501 * treat-forbidden-connects-like-blocks violating
503 * - Add some log messages.
505 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
506 * Move mutex initialization into separate
507 * function and exit in case of errors.
509 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
510 * - Start to reduce chat()'s line count and move
511 * parts of it into separate functions.
512 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
514 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
515 * - Add Proxy-Agent header to HTTP snippets that are
516 * supposed to reach HTTP clients only.
517 * - Made a few CONNECT log messages more descriptive.
518 * - Catch completely empty server responses (as seen
519 * with Tor's fake ".noconnect" top level domain).
520 * - Use shiny new "forwarding-failed" template for socks errors.
522 * Revision 1.118 2007/01/07 07:43:43 joergs
523 * AmigaOS4 support added.
525 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
526 * Added config option accept-intercepted-requests
527 * and disabled it by default.
529 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
530 * Reverted parts of my last commit
531 * to keep error handling working.
533 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
534 * Fixed gcc43 conversion warnings.
536 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
537 * Fix -pedantic ISO C warning about converting
538 * from function pointer to object pointer.
540 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
541 * Silence compiler warning I introduced with my last commit.
543 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
544 * Mutex protect rand() if POSIX threading
545 * is used, warn the user if that's not possible
546 * and stop using it on _WIN32 where it could
549 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
550 * Don't prevent core dumps by catching SIGABRT.
551 * It's rude and makes debugging unreasonable painful.
553 * Revision 1.110 2006/12/13 14:52:53 etresoft
554 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
556 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
557 * Privoxy is now able to run as intercepting
558 * proxy in combination with any packet filter
559 * that does the port redirection. The destination
560 * is extracted from the "Host:" header which
561 * should be available for nearly all requests.
563 * Moved HTTP snipplets into jcc.c.
564 * Added error message for gopher proxy requests.
566 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
567 * Only unlink the pidfile if it's actually used.
569 * Change order of interception checks to make
570 * it possible to block or redirect requests for
573 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
574 * Make pthread mutex locking more generic. Instead of
575 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
576 * and use mutex locking unless there is an _r function
577 * available. Better safe than sorry.
579 * Fixes "./configure --disable-pthread" and should result
580 * in less threading-related problems on pthread-using platforms,
581 * but it still doesn't fix BR#1122404.
583 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
584 * Move pthread.h inclusion from jcc.c to jcc.h.
585 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
587 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
588 * Don't exit after receiving the second SIGHUP on Solaris.
590 * Fixes BR 1052235, but the same problem may exist on other
591 * systems. Once 3.0.6 is out we should use sigset()
592 * where available and see if it breaks anything.
594 * Revision 1.104 2006/09/23 13:26:38 roro
595 * Replace TABs by spaces in source code.
597 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
598 * Fix +redirect{}. Didn't work with -fast-redirects.
600 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
601 * Respond with 400 and a short text message
602 * if the client tries to use Privoxy as FTP proxy.
604 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
605 * Make number of retries in case of forwarded-connect problems
606 * a config file option (forwarded-connect-retries) and use 0 as
609 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
610 * Set random(3) seed.
612 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
613 * Follow the OpenBSD port's lead and protect the resolve
614 * functions on OpenBSD as well.
616 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
617 * --user fix. Only use the user as group if no group is specified.
618 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
620 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
621 * Windows service (re-)integration
625 * --install[:service_name]
626 * --uninstall[:service_name]
629 * They work as follows:
630 * --install will create a service for you and then terminate.
631 * By default the service name will be "privoxy" (without the quotes).
632 * However you can run multiple services if you wish, just by adding
633 * a colon and then a name (no spaces).
635 * --uninstall follows the exact same rules a --install.
637 * --service is used when the program is executed by the service
638 * control manager, and in normal circumstances would never be
639 * used as a command line argument.
641 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
642 * Windows service integration
644 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
645 * Incorporate Fabian Keil's patch work:
646 http://www.fabiankeil.de/sourcecode/privoxy/
648 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
649 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
650 * with what was really the latest development (the v_3_0_branch branch)
652 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
653 * Thanks to Jindrich Makovicka for a race condition fix for the log
654 * file. The race condition remains for non-pthread implementations.
655 * Reference patch #1175720.
657 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
658 * Add the ability to check jpeg images for invalid
659 * lengths of comment blocks. Defensive strategy
660 * against the exploit:
661 * Microsoft Security Bulletin MS04-028
662 * Buffer Overrun in JPEG Processing (GDI+) Could
663 * Allow Code Execution (833987)
664 * Enabled with +inspect-jpegs in actions files.
666 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
667 * - Fixed usage info for non-unix platforms
668 * - Fixed small cmdline parsing bug
670 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
671 * Diagnostics: Now preserve the returncode of pthread_create
672 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
674 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
675 * No longer ignore SIGCHLD. Fixes bug #769381
677 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
678 * Close jarfile on graceful exit, remove stray line
680 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
681 * Cosmetics: Killed a warning, a typo and an allocation left at exit
683 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
684 * No longer rely on non-POSIX.1 extensions of getcwd().
687 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
688 * Replaced setenv() by posix-compliant putenv()
689 * Thanks to Neil McCalden (nmcc AT users.sf.net).
691 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
692 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
694 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
695 * Clean-up and extension of improvements for forked mode:
696 * - Child's return code now consists of flags RC_FLAG_*
697 * - Reporting toggle to parent now properly #ifdef'ed
698 * - Children now report blocking to parent. This enables
699 * statistics in forked mode
701 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
702 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
703 * Children now report having been toggled through _exit(17), parents
704 * watch for that code and toggle themselves if found.
706 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
707 * Wrapping all *_r functions (the non-_r versions of them) with
708 * mutex semaphores for OSX. Hopefully this will take care of all
709 * of those pesky crash reports.
711 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
712 * Fixed two mostly harmless mem leaks
714 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
715 * Fix: Head of global clients list now initialized to NULL
717 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
718 * Added basic support for OPTIONS and TRACE HTTP methods:
719 * - New interceptor direct_response() added in chat().
720 * - sed() moved to earlier in the process, so that the
721 * Host: header is evaluated before actions and forwarding
724 * Revision 1.92 2002/05/08 16:00:46 oes
725 * Chat's buffer handling:
726 * - Fixed bug with unchecked out-of-mem conditions
727 * while reading client request & server headers
728 * - No longer predict if the buffer limit will be exceeded
729 * in the next read -- check add_to_iob's new
730 * return code. If buffer couldn't be extended
731 * (policy or out-of-mem) while
732 * - reading from client: abort
733 * - reading server headers: send error page
734 * - buffering server body for filter: flush,
735 * and if that fails: send error page
737 * Revision 1.91 2002/04/08 20:35:58 swa
740 * Revision 1.90 2002/04/02 14:57:28 oes
741 * Made sending wafers independent of FEATURE_COOKIE_JAR
743 * Revision 1.89 2002/03/31 17:18:59 jongfoster
744 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
746 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
747 * More compiler warning message maintenance
749 * Revision 1.87 2002/03/26 22:29:54 swa
750 * we have a new homepage!
752 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
753 * Workaround for closing the jarfile before load_config() comes around again
755 * Revision 1.85 2002/03/24 15:23:33 jongfoster
758 * Revision 1.84 2002/03/24 13:25:43 swa
759 * name change related issues
761 * Revision 1.83 2002/03/16 23:54:06 jongfoster
762 * Adding graceful termination feature, to help look for memory leaks.
763 * If you enable this (which, by design, has to be done by hand
764 * editing config.h) and then go to http://i.j.b/die, then the program
765 * will exit cleanly after the *next* request. It should free all the
766 * memory that was used.
768 * Revision 1.82 2002/03/13 00:27:05 jongfoster
771 * Revision 1.81 2002/03/12 01:42:50 oes
772 * Introduced modular filters
774 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
775 * OS/2 port maintenance:
776 * - Fixed EMX build - it had decayed a little
777 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
778 * substituted a memset for now.
780 * Revision 1.79 2002/03/09 20:03:52 jongfoster
781 * - Making various functions return int rather than size_t.
782 * (Undoing a recent change). Since size_t is unsigned on
783 * Windows, functions like read_socket that return -1 on
784 * error cannot return a size_t.
786 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
787 * crashes, and also frequently caused JB to jump to 100%
788 * CPU and stay there. (Because it thought it had just
789 * read ((unsigned)-1) == 4Gb of data...)
791 * - The signature of write_socket has changed, it now simply
792 * returns success=0/failure=nonzero.
794 * - Trying to get rid of a few warnings --with-debug on
795 * Windows, I've introduced a new type "jb_socket". This is
796 * used for the socket file descriptors. On Windows, this
797 * is SOCKET (a typedef for unsigned). Everywhere else, it's
798 * an int. The error value can't be -1 any more, so it's
799 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
800 * Windows it maps to the #define INVALID_SOCKET.)
802 * - The signature of bind_port has changed.
804 * Revision 1.78 2002/03/08 21:35:04 oes
805 * Added optional group supplement to --user option. Will now use default group of user if no group given
807 * Revision 1.77 2002/03/07 03:52:06 oes
808 * - Fixed compiler warnings etc
809 * - Improved handling of failed DNS lookups
811 * Revision 1.76 2002/03/06 22:54:35 jongfoster
812 * Automated function-comment nitpicking.
814 * Revision 1.75 2002/03/06 10:02:19 oes
815 * Fixed stupid bug when --user was not given
817 * Revision 1.74 2002/03/06 00:49:31 jongfoster
818 * Fixing warning on Windows
819 * Making #ifdefs that refer to the same variable consistently
820 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
822 * Revision 1.73 2002/03/05 23:57:30 hal9
823 * Stray character 's' on line 1618 was breaking build.
825 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
826 * - Re-enable OS/2 building after new parms were added
827 * - Fix false out of memory report when resolving CGI templates when no IP
828 * address is available of failed attempt (a la no such domain)
830 * Revision 1.71 2002/03/05 18:13:56 oes
831 * Added --user option
833 * Revision 1.70 2002/03/05 04:52:42 oes
834 * Deleted non-errlog debugging code
836 * Revision 1.69 2002/03/04 23:50:00 jongfoster
837 * Splitting off bind_port() call into bind_port_helper(), with
840 * Revision 1.68 2002/03/04 20:17:32 oes
843 * Revision 1.67 2002/03/04 18:18:57 oes
844 * - Removed _DEBUG mode
845 * - Cleand up cmdline parsing
846 * - Introduced --no-daemon, --pidfile options
847 * - Cleaned up signal handling:
848 * - Terminate cleanly on INT, TERM and ABRT
849 * - Schedule logfile for re-opening on HUP
850 * - Ignore CHLD and PIPE
851 * - Leave the rest with their default handlers
852 * - Uniform handler registration
853 * - Added usage() function
854 * - Played styleguide police
856 * Revision 1.66 2002/03/03 15:06:55 oes
857 * Re-enabled automatic config reloading
859 * Revision 1.65 2002/03/03 14:49:11 oes
860 * Fixed CLF logging: Now uses client's original HTTP request
862 * Revision 1.64 2002/03/03 09:18:03 joergs
863 * Made jumbjuster work on AmigaOS again.
865 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
866 * Clean up a little CRLF unpleasantness that suddenly appeared
868 * Revision 1.62 2002/02/20 23:17:23 jongfoster
869 * Detecting some out-of memory conditions and exiting with a log message.
871 * Revision 1.61 2002/01/17 21:01:52 jongfoster
872 * Moving all our URL and URL pattern parsing code to urlmatch.c.
874 * Revision 1.60 2001/12/30 14:07:32 steudten
875 * - Add signal handling (unix)
876 * - Add SIGHUP handler (unix)
877 * - Add creation of pidfile (unix)
878 * - Add action 'top' in rc file (RH)
879 * - Add entry 'SIGNALS' to manpage
880 * - Add exit message to logfile (unix)
882 * Revision 1.59 2001/12/13 14:07:18 oes
883 * Fixed Bug: 503 error page now sent OK
885 * Revision 1.58 2001/11/30 23:37:24 jongfoster
886 * Renaming the Win32 config file to config.txt - this is almost the
887 * same as the corresponding UNIX name "config"
889 * Revision 1.57 2001/11/16 00:47:43 jongfoster
890 * Changing the tty-disconnection code to use setsid().
892 * Revision 1.56 2001/11/13 20:20:54 jongfoster
893 * Tabs->spaces, fixing a bug with missing {} around an if()
895 * Revision 1.55 2001/11/13 20:14:53 jongfoster
896 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
898 * Revision 1.54 2001/11/07 00:03:14 steudten
899 * Give reliable return value if an error
900 * occurs not just 0 with new daemon mode.
902 * Revision 1.53 2001/11/05 21:41:43 steudten
903 * Add changes to be a real daemon just for unix os.
904 * (change cwd to /, detach from controlling tty, set
905 * process group and session leader to the own process.
907 * Add some fatal-error log message for failed malloc().
908 * Add '-d' if compiled with 'configure --with-debug' to
909 * enable debug output.
911 * Revision 1.52 2001/10/26 20:11:20 jongfoster
912 * Fixing type mismatch
914 * Revision 1.51 2001/10/26 17:38:28 oes
917 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
918 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
919 * threads to call select() simultaneously. So, it's time to do a real, live,
920 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
921 * (native). Both versions will work, but using __OS2__ offers multi-threading.
923 * Revision 1.49 2001/10/23 21:41:35 jongfoster
924 * Added call to initialize the (statically-allocated of course)
925 * "out of memory" CGI response.
927 * Revision 1.48 2001/10/10 19:56:46 jongfoster
928 * Moving some code that wasn't cookie-related out of an #ifdef
931 * Revision 1.47 2001/10/10 16:44:36 oes
932 * Added CONNECT destination port limitation check
934 * Revision 1.46 2001/10/08 15:17:41 oes
935 * Re-enabled SSL forwarding
937 * Revision 1.45 2001/10/07 15:42:11 oes
938 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
940 * Moved downgrading of the HTTP version from parse_http_request to
941 * chat(), since we can't decide if it is necessary before we have
942 * determined the actions for the URL. The HTTP command is now
943 * *always* re-built so the repairs need no longer be special-cased.
945 * filter_popups now gets a csp pointer so it can raise the new
946 * CSP_FLAG_MODIFIED flag.
950 * Added configurable size limit for the IOB. If the IOB grows so
951 * large that the next read would exceed the limit, the header
952 * is generated, and the header & unfiltered buffer are flushed
953 * to the client. Chat then continues in non-buffering,
954 * non-filtering body mode.
956 * Revision 1.44 2001/10/02 18:13:57 oes
959 * Revision 1.43 2001/10/02 15:32:13 oes
960 * Moved generation of hdr
962 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
963 * Cleaning up 2 compiler warnings on OS/2.
965 * Revision 1.41 2001/09/16 17:05:14 jongfoster
966 * Removing unused #include showarg.h
968 * Revision 1.40 2001/09/16 15:41:45 jongfoster
969 * Fixing signed/unsigned comparison warning.
971 * Revision 1.39 2001/09/16 13:21:27 jongfoster
972 * Changes to use new list functions.
974 * Revision 1.38 2001/09/16 13:01:46 jongfoster
975 * Removing redundant function call that zeroed zalloc()'d memory.
977 * Revision 1.37 2001/09/10 11:12:24 oes
978 * Deleted unused variable
980 * Revision 1.36 2001/09/10 10:56:15 oes
981 * Silenced compiler warnings
983 * Revision 1.35 2001/07/31 14:44:22 oes
984 * Deleted unused size parameter from filter_popups()
986 * Revision 1.34 2001/07/30 22:08:36 jongfoster
987 * Tidying up #defines:
988 * - All feature #defines are now of the form FEATURE_xxx
989 * - Permanently turned off WIN_GUI_EDIT
990 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
992 * Revision 1.33 2001/07/29 19:32:00 jongfoster
993 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
995 * Revision 1.32 2001/07/29 18:47:05 jongfoster
996 * Adding missing #include "loadcfg.h"
998 * Revision 1.31 2001/07/29 12:17:48 oes
999 * Applied pthread fix by Paul Lieverse
1001 * Revision 1.30 2001/07/25 22:57:13 jongfoster
1002 * __BEOS__ no longer overrides FEATURE_PTHREAD.
1003 * This is because FEATURE_PTHREAD will soon be widely used, so I
1004 * want to keep it simple.
1006 * Revision 1.29 2001/07/24 12:47:06 oes
1007 * Applied BeOS support update by Eugenia
1009 * Revision 1.28 2001/07/23 13:26:12 oes
1010 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
1012 * Revision 1.27 2001/07/19 19:09:47 haroon
1013 * - Added code to take care of the situation where while processing the first
1014 * server response (which includes the server header), after finding the end
1015 * of the headers we were not looking past the end of the headers for
1016 * content modification. I enabled it for filter_popups.
1017 * Someone else should look to see if other similar operations should be
1018 * done to the discarded portion of the buffer.
1020 * Note 2001/07/20: No, the other content modification mechanisms will process
1021 * the whole iob later anyway. --oes
1023 * Revision 1.26 2001/07/18 12:31:36 oes
1026 * Revision 1.25 2001/07/15 19:43:49 jongfoster
1027 * Supports POSIX threads.
1028 * Also removed some unused #includes.
1030 * Revision 1.24 2001/07/13 14:00:40 oes
1031 * - Generic content modification scheme:
1032 * Each feature has its own applicability flag that is set
1033 * from csp->action->flags.
1034 * Replaced the "filtering" int flag , by a function pointer
1035 * "content_filter" to the function that will do the content
1036 * modification. If it is != NULL, the document will be buffered
1037 * and processed through *content_filter, which must set
1038 * csp->content_length and return a modified copy of the body
1039 * or return NULL (on failiure).
1040 * - Changed csp->is_text to the more generic bitmap csp->content_type
1041 * which can currently take the valued CT_TEXT or CT_GIF
1042 * - Reformatting etc
1043 * - Removed all #ifdef PCRS
1045 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
1046 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
1047 * the `block_acl' call. This prevents a compilation error when the user
1048 * does not wish to use the "ACL" feature.
1050 * Revision 1.22 2001/06/29 21:45:41 oes
1051 * Indentation, CRLF->LF, Tab-> Space
1053 * Revision 1.21 2001/06/29 13:29:36 oes
1054 * - Cleaned up, improved comments
1055 * - Unified all possible interceptors (CGI,
1056 * block, trust, fast_redirect) in one
1057 * place, with one (CGI) answer generation
1058 * mechansim. Much clearer now.
1059 * - Removed the GIF image generation, which
1060 * is now done in filters.c:block_url()
1061 * - Made error conditions like domain lookup
1062 * failiure or (various) problems while talking
1063 * to the server use cgi.c:error_response()
1064 * instead of generating HTML/HTTP in chat() (yuck!)
1065 * - Removed logentry from cancelled commit
1067 * Revision 1.20 2001/06/09 10:55:28 jongfoster
1068 * Changing BUFSIZ ==> BUFFER_SIZE
1070 * Revision 1.19 2001/06/07 23:12:52 jongfoster
1071 * Replacing function pointer in struct gateway with a directly
1072 * called function forwarded_connect().
1073 * Replacing struct gateway with struct forward_spec
1075 * Revision 1.18 2001/06/03 19:12:16 oes
1076 * introduced new cgi handling
1078 * Revision 1.17 2001/06/01 20:07:23 jongfoster
1079 * Now uses action +image-blocker{} rather than config->tinygif
1081 * Revision 1.16 2001/06/01 18:49:17 jongfoster
1082 * Replaced "list_share" with "list" - the tiny memory gain was not
1083 * worth the extra complexity.
1085 * Revision 1.15 2001/05/31 21:24:47 jongfoster
1086 * Changed "permission" to "action" throughout.
1087 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
1088 * Moved vanilla wafer check into chat(), since we must now
1089 * decide whether or not to add it based on the URL.
1091 * Revision 1.14 2001/05/29 20:14:01 joergs
1092 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
1095 * Revision 1.13 2001/05/29 09:50:24 jongfoster
1096 * Unified blocklist/imagelist/permissionslist.
1097 * File format is still under discussion, but the internal changes
1098 * are (mostly) done.
1100 * Also modified interceptor behaviour:
1101 * - We now intercept all URLs beginning with one of the following
1102 * prefixes (and *only* these prefixes):
1104 * * http://ijbswa.sf.net/config/
1105 * * http://ijbswa.sourceforge.net/config/
1106 * - New interceptors "home page" - go to http://i.j.b/ to see it.
1107 * - Internal changes so that intercepted and fast redirect pages
1108 * are not replaced with an image.
1109 * - Interceptors now have the option to send a binary page direct
1110 * to the client. (i.e. ijb-send-banner uses this)
1111 * - Implemented show-url-info interceptor. (Which is why I needed
1112 * the above interceptors changes - a typical URL is
1113 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
1114 * The previous mechanism would not have intercepted that, and
1115 * if it had been intercepted then it then it would have replaced
1116 * it with an image.)
1118 * Revision 1.12 2001/05/27 22:17:04 oes
1120 * - re_process_buffer no longer writes the modified buffer
1121 * to the client, which was very ugly. It now returns the
1122 * buffer, which it is then written by chat.
1124 * - content_length now adjusts the Content-Length: header
1125 * for modified documents rather than crunch()ing it.
1126 * (Length info in csp->content_length, which is 0 for
1127 * unmodified documents)
1129 * - For this to work, sed() is called twice when filtering.
1131 * Revision 1.11 2001/05/26 17:27:53 jongfoster
1132 * Added support for CLF and fixed LOG_LEVEL_LOG.
1133 * Also did CRLF->LF fix of my previous patch.
1135 * Revision 1.10 2001/05/26 15:26:15 jongfoster
1136 * ACL feature now provides more security by immediately dropping
1137 * connections from untrusted hosts.
1139 * Revision 1.9 2001/05/26 00:28:36 jongfoster
1140 * Automatic reloading of config file.
1141 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
1142 * Most of the global variables have been moved to a new
1143 * struct configuration_spec, accessed through csp->config->globalname
1144 * Most of the globals remaining are used by the Win32 GUI.
1146 * Revision 1.8 2001/05/25 22:43:18 jongfoster
1147 * Fixing minor memory leak and buffer overflow.
1149 * Revision 1.7 2001/05/25 22:34:30 jongfoster
1152 * Revision 1.6 2001/05/23 00:13:58 joergs
1153 * AmigaOS support fixed.
1155 * Revision 1.5 2001/05/22 18:46:04 oes
1157 * - Enabled filtering banners by size rather than URL
1158 * by adding patterns that replace all standard banner
1159 * sizes with the "Junkbuster" gif to the re_filterfile
1161 * - Enabled filtering WebBugs by providing a pattern
1162 * which kills all 1x1 images
1164 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
1165 * which is selected by the (nonstandard and therefore
1166 * capital) letter 'U' in the option string.
1167 * It causes the quantifiers to be ungreedy by default.
1168 * Appending a ? turns back to greedy (!).
1170 * - Added a new interceptor ijb-send-banner, which
1171 * sends back the "Junkbuster" gif. Without imagelist or
1172 * MSIE detection support, or if tinygif = 1, or the
1173 * URL isn't recognized as an imageurl, a lame HTML
1174 * explanation is sent instead.
1176 * - Added new feature, which permits blocking remote
1177 * script redirects and firing back a local redirect
1179 * The feature is conditionally compiled, i.e. it
1180 * can be disabled with --disable-fast-redirects,
1181 * plus it must be activated by a "fast-redirects"
1182 * line in the config file, has its own log level
1183 * and of course wants to be displayed by show-proxy-args
1184 * Note: Boy, all the #ifdefs in 1001 locations and
1185 * all the fumbling with configure.in and acconfig.h
1186 * were *way* more work than the feature itself :-(
1188 * - Because a generic redirect template was needed for
1189 * this, tinygif = 3 now uses the same.
1191 * - Moved GIFs, and other static HTTP response templates
1194 * - Some minor fixes
1196 * - Removed some >400 CRs again (Jon, you really worked
1199 * Revision 1.4 2001/05/21 19:34:01 jongfoster
1200 * Made failure to bind() a fatal error.
1202 * Revision 1.3 2001/05/20 01:21:20 jongfoster
1203 * Version 2.9.4 checkin.
1204 * - Merged popupfile and cookiefile, and added control over PCRS
1205 * filtering, in new "permissionsfile".
1206 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
1207 * file error you now get a message box (in the Win32 GUI) rather
1208 * than the program exiting with no explanation.
1209 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
1211 * - Removed tabs from "config"
1212 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
1213 * - Bumped up version number.
1215 * Revision 1.2 2001/05/17 22:34:44 oes
1216 * - Added hint on GIF char array generation to jcc.c
1217 * - Cleaned CRLF's from the sources and related files
1218 * - Repaired logging for REF and FRC
1220 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
1221 * Initial import of version 2.9.3 source tree
1224 *********************************************************************/
1230 #include <sys/types.h>
1239 # ifndef FEATURE_PTHREAD
1243 # include <windows.h>
1244 # include <process.h>
1245 # endif /* ndef FEATURE_PTHREAD */
1248 # ifndef _WIN_CONSOLE
1249 # include "w32log.h"
1250 # endif /* ndef _WIN_CONSOLE */
1251 # include "w32svrapi.h"
1253 #else /* ifndef _WIN32 */
1255 # if !defined (__OS2__)
1256 # include <unistd.h>
1257 # include <sys/wait.h>
1258 # endif /* ndef __OS2__ */
1259 # include <sys/time.h>
1260 # include <sys/stat.h>
1261 # include <sys/ioctl.h>
1264 #include <sys/termios.h>
1272 # include <signal.h>
1275 # include <socket.h> /* BeOS has select() for sockets only. */
1276 # include <OS.h> /* declarations for threads and stuff. */
1279 # if defined(__EMX__) || defined(__OS2__)
1280 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1285 #define bzero(B,N) memset(B,0x00,n)
1289 # include <select.h>
1294 #include "project.h"
1297 #include "filters.h"
1298 #include "loaders.h"
1299 #include "parsers.h"
1300 #include "miscutil.h"
1302 #include "jbsockets.h"
1303 #include "gateway.h"
1304 #include "actions.h"
1306 #include "loadcfg.h"
1307 #include "urlmatch.h"
1309 const char jcc_h_rcs[] = JCC_H_VERSION;
1310 const char project_h_rcs[] = PROJECT_H_VERSION;
1313 struct client_state clients[1];
1314 struct file_list files[1];
1316 #ifdef FEATURE_STATISTICS
1317 int urls_read = 0; /* total nr of urls read inc rejected */
1318 int urls_rejected = 0; /* total nr of urls rejected */
1319 #endif /* def FEATURE_STATISTICS */
1321 #ifdef FEATURE_GRACEFUL_TERMINATION
1322 int g_terminate = 0;
1325 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1326 static void sig_handler(int the_signal);
1328 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1329 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1330 static jb_err get_server_headers(struct client_state *csp);
1331 static const char *crunch_reason(const struct http_response *rsp);
1332 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
1333 static char *get_request_line(struct client_state *csp);
1334 static jb_err receive_client_request(struct client_state *csp);
1335 static jb_err parse_client_request(struct client_state *csp);
1336 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1337 static jb_err change_request_destination(struct client_state *csp);
1338 static void chat(struct client_state *csp);
1339 static void serve(struct client_state *csp);
1340 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1341 static void usage(const char *myname);
1343 static void initialize_mutexes(void);
1344 static jb_socket bind_port_helper(struct configuration_spec *config);
1345 static void listen_loop(void);
1348 void serve(struct client_state *csp);
1349 #else /* ifndef AMIGA */
1350 static void serve(struct client_state *csp);
1351 #endif /* def AMIGA */
1354 static int32 server_thread(void *data);
1355 #endif /* def __BEOS__ */
1358 #define sleep(N) Sleep(((N) * 1000))
1362 #define sleep(N) DosSleep(((N) * 100))
1365 #ifdef MUTEX_LOCKS_AVAILABLE
1367 * XXX: Does the locking stuff really belong in this file?
1369 privoxy_mutex_t log_mutex;
1370 privoxy_mutex_t log_init_mutex;
1371 privoxy_mutex_t connection_reuse_mutex;
1373 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1374 privoxy_mutex_t resolver_mutex;
1375 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1377 #ifndef HAVE_GMTIME_R
1378 privoxy_mutex_t gmtime_mutex;
1379 #endif /* ndef HAVE_GMTIME_R */
1381 #ifndef HAVE_LOCALTIME_R
1382 privoxy_mutex_t localtime_mutex;
1383 #endif /* ndef HAVE_GMTIME_R */
1386 privoxy_mutex_t rand_mutex;
1387 #endif /* ndef HAVE_RANDOM */
1389 #endif /* def MUTEX_LOCKS_AVAILABLE */
1392 const char *basedir = NULL;
1393 const char *pidfile = NULL;
1394 static int received_hup_signal = 0;
1395 #endif /* defined unix */
1397 /* HTTP snipplets. */
1398 static const char CSUCCEED[] =
1399 "HTTP/1.0 200 Connection established\r\n"
1400 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1402 static const char CHEADER[] =
1403 "HTTP/1.0 400 Invalid header received from client\r\n"
1404 "Proxy-Agent: Privoxy " VERSION "\r\n"
1405 "Content-Type: text/plain\r\n"
1406 "Connection: close\r\n\r\n"
1407 "Invalid header received from client.\r\n";
1409 static const char FTP_RESPONSE[] =
1410 "HTTP/1.0 400 Invalid request received from client\r\n"
1411 "Content-Type: text/plain\r\n"
1412 "Connection: close\r\n\r\n"
1413 "Invalid request. Privoxy doesn't support FTP.\r\n";
1415 static const char GOPHER_RESPONSE[] =
1416 "HTTP/1.0 400 Invalid request received from client\r\n"
1417 "Content-Type: text/plain\r\n"
1418 "Connection: close\r\n\r\n"
1419 "Invalid request. Privoxy doesn't support gopher.\r\n";
1421 /* XXX: should be a template */
1422 static const char MISSING_DESTINATION_RESPONSE[] =
1423 "HTTP/1.0 400 Bad request received from client\r\n"
1424 "Proxy-Agent: Privoxy " VERSION "\r\n"
1425 "Content-Type: text/plain\r\n"
1426 "Connection: close\r\n\r\n"
1427 "Bad request. Privoxy was unable to extract the destination.\r\n";
1429 /* XXX: should be a template */
1430 static const char NO_SERVER_DATA_RESPONSE[] =
1431 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1432 "Proxy-Agent: Privoxy " VERSION "\r\n"
1433 "Content-Type: text/plain\r\n"
1434 "Connection: close\r\n\r\n"
1435 "Empty server or forwarder response.\r\n"
1436 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1438 /* XXX: should be a template */
1439 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1440 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1441 "Proxy-Agent: Privoxy " VERSION "\r\n"
1442 "Content-Type: text/plain\r\n"
1443 "Connection: close\r\n\r\n"
1444 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1447 /* XXX: should be a template */
1448 static const char NULL_BYTE_RESPONSE[] =
1449 "HTTP/1.0 400 Bad request received from client\r\n"
1450 "Proxy-Agent: Privoxy " VERSION "\r\n"
1451 "Content-Type: text/plain\r\n"
1452 "Connection: close\r\n\r\n"
1453 "Bad request. Null byte(s) before end of request.\r\n";
1456 /* XXX: should be a template */
1457 static const char MESSED_UP_REQUEST_RESPONSE[] =
1458 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1459 "Proxy-Agent: Privoxy " VERSION "\r\n"
1460 "Content-Type: text/plain\r\n"
1461 "Connection: close\r\n\r\n"
1462 "Bad request. Messed up with header filters.\r\n";
1464 /* XXX: should be a template */
1465 static const char CONNECTION_TIMEOUT_RESPONSE[] =
1466 "HTTP/1.0 502 Connection timeout\r\n"
1467 "Proxy-Agent: Privoxy " VERSION "\r\n"
1468 "Content-Type: text/plain\r\n"
1469 "Connection: close\r\n\r\n"
1470 "The connection timed out.\r\n";
1472 /* A function to crunch a response */
1473 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1475 /* Crunch function flags */
1476 #define CF_NO_FLAGS 0
1477 /* Cruncher applies to forced requests as well */
1478 #define CF_IGNORE_FORCE 1
1479 /* Crunched requests are counted for the block statistics */
1480 #define CF_COUNT_AS_REJECT 2
1482 /* A crunch function and its flags */
1485 const crunch_func_ptr cruncher;
1489 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1491 /* Complete list of cruncher functions */
1492 static const struct cruncher crunchers_all[] = {
1493 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1494 { block_url, CF_COUNT_AS_REJECT },
1495 #ifdef FEATURE_TRUST
1496 { trust_url, CF_COUNT_AS_REJECT },
1497 #endif /* def FEATURE_TRUST */
1498 { redirect_url, CF_NO_FLAGS },
1499 { dispatch_cgi, CF_IGNORE_FORCE},
1503 /* Light version, used after tags are applied */
1504 static const struct cruncher crunchers_light[] = {
1505 { block_url, CF_COUNT_AS_REJECT },
1506 { redirect_url, CF_NO_FLAGS },
1512 * XXX: Don't we really mean
1518 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1519 /*********************************************************************
1521 * Function : sig_handler
1523 * Description : Signal handler for different signals.
1524 * Exit gracefully on TERM and INT
1525 * or set a flag that will cause the errlog
1526 * to be reopened by the main thread on HUP.
1529 * 1 : the_signal = the signal cause this function to call
1533 *********************************************************************/
1534 static void sig_handler(int the_signal)
1540 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1552 received_hup_signal = 1;
1558 * We shouldn't be here, unless we catch signals
1559 * in main() that we can't handle here!
1561 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1569 /*********************************************************************
1571 * Function : client_protocol_is_unsupported
1573 * Description : Checks if the client used a known unsupported
1574 * protocol and deals with it by sending an error
1578 * 1 : csp = Current client state (buffers, headers, etc...)
1579 * 2 : req = the first request line send by the client
1581 * Returns : TRUE if an error response has been generated, or
1582 * FALSE if the request doesn't look invalid.
1584 *********************************************************************/
1585 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1588 * If it's a FTP or gopher request, we don't support it.
1590 * These checks are better than nothing, but they might
1591 * not work in all configurations and some clients might
1592 * have problems digesting the answer.
1594 * They should, however, never cause more problems than
1595 * Privoxy's old behaviour (returning the misleading HTML
1598 * "Could not resolve http://(ftp|gopher)://example.org").
1600 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1602 const char *response = NULL;
1603 const char *protocol = NULL;
1605 if (!strncmpic(req, "GET ftp://", 10))
1607 response = FTP_RESPONSE;
1612 response = GOPHER_RESPONSE;
1613 protocol = "GOPHER";
1615 log_error(LOG_LEVEL_ERROR,
1616 "%s tried to use Privoxy as %s proxy: %s",
1617 csp->ip_addr_str, protocol, req);
1618 log_error(LOG_LEVEL_CLF,
1619 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1621 write_socket(csp->cfd, response, strlen(response));
1630 /*********************************************************************
1632 * Function : get_request_destination_elsewhere
1634 * Description : If the client's request was redirected into
1635 * Privoxy without the client's knowledge,
1636 * the request line lacks the destination host.
1638 * This function tries to get it elsewhere,
1639 * provided accept-intercepted-requests is enabled.
1641 * "Elsewhere" currently only means "Host: header",
1642 * but in the future we may ask the redirecting
1643 * packet filter to look the destination up.
1645 * If the destination stays unknown, an error
1646 * response is send to the client and headers
1647 * are freed so that chat() can return directly.
1650 * 1 : csp = Current client state (buffers, headers, etc...)
1651 * 2 : headers = a header list
1653 * Returns : JB_ERR_OK if the destination is now known, or
1654 * JB_ERR_PARSE if it isn't.
1656 *********************************************************************/
1657 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1661 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1663 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1664 " Privoxy isn't configured to accept intercepted requests.",
1665 csp->ip_addr_str, csp->http->cmd);
1666 /* XXX: Use correct size */
1667 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1668 csp->ip_addr_str, csp->http->cmd);
1670 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1671 destroy_list(headers);
1673 return JB_ERR_PARSE;
1675 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1677 /* Split the domain we just got for pattern matching */
1678 init_domain_components(csp->http);
1684 /* We can't work without destination. Go spread the news.*/
1686 req = list_to_text(headers);
1688 /* XXX: Use correct size */
1689 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1690 csp->ip_addr_str, csp->http->cmd);
1691 log_error(LOG_LEVEL_ERROR,
1692 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1693 csp->ip_addr_str, csp->http->cmd, req);
1696 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1697 destroy_list(headers);
1699 return JB_ERR_PARSE;
1702 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1703 * to get the destination IP address, use it as host directly
1704 * or do a reverse DNS lookup first.
1709 /*********************************************************************
1711 * Function : get_server_headers
1713 * Description : Parses server headers in iob and fills them
1714 * into csp->headers so that they can later be
1718 * 1 : csp = Current client state (buffers, headers, etc...)
1720 * Returns : JB_ERR_OK if everything went fine, or
1721 * JB_ERR_PARSE if the headers were incomplete.
1723 *********************************************************************/
1724 static jb_err get_server_headers(struct client_state *csp)
1726 int continue_hack_in_da_house = 0;
1729 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1734 * continue hack in da house. Ignore the ending of
1735 * this head and continue enlisting header lines.
1736 * The reason is described below.
1738 enlist(csp->headers, "");
1739 continue_hack_in_da_house = 0;
1742 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1745 * It's a bodyless continue response, don't
1746 * stop header parsing after reaching its end.
1748 * As a result Privoxy will concatenate the
1749 * next response's head and parse and deliver
1750 * the headers as if they belonged to one request.
1752 * The client will separate them because of the
1753 * empty line between them.
1755 * XXX: What we're doing here is clearly against
1756 * the intended purpose of the continue header,
1757 * and under some conditions (HTTP/1.0 client request)
1758 * it's a standard violation.
1760 * Anyway, "sort of against the spec" is preferable
1761 * to "always getting confused by Continue responses"
1762 * (Privoxy's behaviour before this hack was added)
1764 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1765 continue_hack_in_da_house = 1;
1767 else if (*header == '\0')
1770 * If the header is empty, but the Continue hack
1771 * isn't active, we can assume that we reached the
1772 * end of the buffer before we hit the end of the
1775 * Inform the caller an let it decide how to handle it.
1777 return JB_ERR_PARSE;
1780 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1783 * XXX: Should we quit the request and return a
1784 * out of memory error page instead?
1786 log_error(LOG_LEVEL_ERROR,
1787 "Out of memory while enlisting server headers. %s lost.",
1797 /*********************************************************************
1799 * Function : crunch_reason
1801 * Description : Translates the crunch reason code into a string.
1804 * 1 : rsp = a http_response
1806 * Returns : A string with the crunch reason or an error description.
1808 *********************************************************************/
1809 static const char *crunch_reason(const struct http_response *rsp)
1811 char * reason = NULL;
1813 assert(rsp != NULL);
1816 return "Internal error while searching for crunch reason";
1819 switch (rsp->reason)
1821 case RSP_REASON_UNSUPPORTED:
1822 reason = "Unsupported HTTP feature";
1824 case RSP_REASON_BLOCKED:
1827 case RSP_REASON_UNTRUSTED:
1828 reason = "Untrusted";
1830 case RSP_REASON_REDIRECTED:
1831 reason = "Redirected";
1833 case RSP_REASON_CGI_CALL:
1834 reason = "CGI Call";
1836 case RSP_REASON_NO_SUCH_DOMAIN:
1837 reason = "DNS failure";
1839 case RSP_REASON_FORWARDING_FAILED:
1840 reason = "Forwarding failed";
1842 case RSP_REASON_CONNECT_FAILED:
1843 reason = "Connection failure";
1845 case RSP_REASON_OUT_OF_MEMORY:
1846 reason = "Out of memory (may mask other reasons)";
1849 reason = "No reason recorded";
1857 /*********************************************************************
1859 * Function : send_crunch_response
1861 * Description : Delivers already prepared response for
1862 * intercepted requests, logs the interception
1863 * and frees the response.
1866 * 1 : csp = Current client state (buffers, headers, etc...)
1867 * 1 : rsp = Fully prepared response. Will be freed on exit.
1869 * Returns : Nothing.
1871 *********************************************************************/
1872 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
1874 const struct http_request *http = csp->http;
1875 char status_code[4];
1877 assert(rsp != NULL);
1878 assert(rsp->head != NULL);
1883 * Not supposed to happen. If it does
1884 * anyway, treat it as an unknown error.
1886 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1887 /* return code doesn't matter */
1892 /* If rsp is still NULL, we have serious internal problems. */
1893 log_error(LOG_LEVEL_FATAL,
1894 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1898 * Extract the status code from the actual head
1899 * that was send to the client. It is the only
1900 * way to get it right for all requests, including
1901 * the fixed ones for out-of-memory problems.
1903 * A head starts like this: 'HTTP/1.1 200...'
1907 status_code[0] = rsp->head[9];
1908 status_code[1] = rsp->head[10];
1909 status_code[2] = rsp->head[11];
1910 status_code[3] = '\0';
1912 /* Write the answer to the client */
1913 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1914 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1916 /* There is nothing we can do about it. */
1917 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1920 /* Log that the request was crunched and why. */
1921 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
1922 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
1923 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1925 /* Clean up and return */
1926 if (cgi_error_memory() != rsp)
1928 free_http_response(rsp);
1935 /*********************************************************************
1937 * Function : request_contains_null_bytes
1939 * Description : Checks for NULL bytes in the request and sends
1940 * an error message to the client if any were found.
1942 * XXX: currently not used, see comment in chat().
1945 * 1 : csp = Current client state (buffers, headers, etc...)
1946 * 2 : buf = Data from the client's request to check.
1947 * 3 : len = The data length.
1949 * Returns : TRUE if the request contained one or more NULL bytes, or
1952 *********************************************************************/
1953 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1955 size_t c_len; /* Request lenght when treated as C string */
1957 c_len = strlen(buf);
1962 * Null byte(s) found. Log the request,
1963 * return an error response and hang up.
1965 size_t tmp_len = c_len;
1970 * Replace NULL byte(s) with '°' characters
1971 * so the request can be logged as string.
1972 * XXX: Is there a better replacement character?
1975 tmp_len += strlen(buf+tmp_len);
1976 } while (tmp_len < len);
1978 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
1979 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
1980 log_error(LOG_LEVEL_HEADER,
1981 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
1983 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
1985 /* XXX: Log correct size */
1986 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1996 /*********************************************************************
1998 * Function : crunch_response_triggered
2000 * Description : Checks if the request has to be crunched,
2001 * and delivers the crunch response if necessary.
2004 * 1 : csp = Current client state (buffers, headers, etc...)
2005 * 2 : crunchers = list of cruncher functions to run
2007 * Returns : TRUE if the request was answered with a crunch response
2010 *********************************************************************/
2011 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
2013 struct http_response *rsp = NULL;
2014 const struct cruncher *c;
2017 * If CGI request crunching is disabled,
2018 * check the CGI dispatcher out of order to
2019 * prevent unintentional blocks or redirects.
2021 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
2022 && (NULL != (rsp = dispatch_cgi(csp))))
2024 /* Deliver, log and free the interception response. */
2025 send_crunch_response(csp, rsp);
2029 for (c = crunchers; c->cruncher != NULL; c++)
2032 * Check the cruncher if either Privoxy is toggled
2033 * on and the request isn't forced, or if the cruncher
2034 * applies to forced requests as well.
2036 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
2037 !(csp->flags & CSP_FLAG_FORCED)) ||
2038 (c->flags & CF_IGNORE_FORCE))
2040 rsp = c->cruncher(csp);
2043 /* Deliver, log and free the interception response. */
2044 send_crunch_response(csp, rsp);
2045 #ifdef FEATURE_STATISTICS
2046 if (c->flags & CF_COUNT_AS_REJECT)
2048 csp->flags |= CSP_FLAG_REJECTED;
2050 #endif /* def FEATURE_STATISTICS */
2061 /*********************************************************************
2063 * Function : build_request_line
2065 * Description : Builds the HTTP request line.
2067 * If a HTTP forwarder is used it expects the whole URL,
2068 * web servers only get the path.
2071 * 1 : csp = Current client state (buffers, headers, etc...)
2072 * 2 : fwd = The forwarding spec used for the request
2073 * XXX: Should use http->fwd instead.
2074 * 3 : request_line = The old request line which will be replaced.
2076 * Returns : Nothing. Terminates in case of memory problems.
2078 *********************************************************************/
2079 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
2081 struct http_request *http = csp->http;
2083 assert(http->ssl == 0);
2086 * Downgrade http version from 1.1 to 1.0
2087 * if +downgrade action applies.
2089 if ( (csp->action->flags & ACTION_DOWNGRADE)
2090 && (!strcmpic(http->ver, "HTTP/1.1")))
2093 http->ver = strdup("HTTP/1.0");
2095 if (http->ver == NULL)
2097 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
2102 * Rebuild the request line.
2104 freez(*request_line);
2105 *request_line = strdup(http->gpc);
2106 string_append(request_line, " ");
2108 if (fwd->forward_host)
2110 string_append(request_line, http->url);
2114 string_append(request_line, http->path);
2116 string_append(request_line, " ");
2117 string_append(request_line, http->ver);
2119 if (*request_line == NULL)
2121 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
2123 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
2127 /*********************************************************************
2129 * Function : change_request_destination
2131 * Description : Parse a (rewritten) request line and regenerate
2132 * the http request data.
2135 * 1 : csp = Current client state (buffers, headers, etc...)
2137 * Returns : Forwards the parse_http_request() return code.
2138 * Terminates in case of memory problems.
2140 *********************************************************************/
2141 static jb_err change_request_destination(struct client_state *csp)
2143 struct http_request *http = csp->http;
2146 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
2147 free_http_request(http);
2148 err = parse_http_request(csp->headers->first->str, http);
2149 if (JB_ERR_OK != err)
2151 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2152 jb_err_to_string(err));
2156 /* XXX: ocmd is a misleading name */
2157 http->ocmd = strdup(http->cmd);
2158 if (http->ocmd == NULL)
2160 log_error(LOG_LEVEL_FATAL,
2161 "Out of memory copying rewritten HTTP request line");
2169 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2170 /*********************************************************************
2172 * Function : server_response_is_complete
2174 * Description : Determines whether we should stop reading
2175 * from the server socket.
2178 * 1 : csp = Current client state (buffers, headers, etc...)
2179 * 2 : content_length = Length of content received so far.
2181 * Returns : TRUE if the response is complete,
2184 *********************************************************************/
2185 static int server_response_is_complete(struct client_state *csp,
2186 unsigned long long content_length)
2188 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
2190 if (!strcmpic(csp->http->gpc, "HEAD"))
2193 * "HEAD" implies no body, we are thus expecting
2194 * no content. XXX: incomplete "list" of methods?
2196 csp->expected_content_length = 0;
2197 content_length_known = TRUE;
2200 if (csp->http->status == 304)
2203 * Expect no body. XXX: incomplete "list" of status codes?
2205 csp->expected_content_length = 0;
2206 content_length_known = TRUE;
2209 return (content_length_known && ((0 == csp->expected_content_length)
2210 || (csp->expected_content_length <= content_length)));
2214 /*********************************************************************
2216 * Function : wait_for_alive_connections
2218 * Description : Waits for alive connections to timeout.
2224 *********************************************************************/
2225 static void wait_for_alive_connections()
2227 int connections_alive = close_unusable_connections();
2229 while (0 < connections_alive)
2231 log_error(LOG_LEVEL_CONNECT,
2232 "Waiting for %d connections to timeout.",
2235 connections_alive = close_unusable_connections();
2238 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
2241 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2244 /*********************************************************************
2246 * Function : mark_server_socket_tainted
2248 * Description : Makes sure we don't reuse a server socket
2249 * (if we didn't read everything the server sent
2250 * us reusing the socket would lead to garbage).
2253 * 1 : csp = Current client state (buffers, headers, etc...)
2257 *********************************************************************/
2258 static void mark_server_socket_tainted(struct client_state *csp)
2260 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
2262 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
2263 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
2267 /*********************************************************************
2269 * Function : get_request_line
2271 * Description : Read the client request line.
2274 * 1 : csp = Current client state (buffers, headers, etc...)
2276 * Returns : Pointer to request line or NULL in case of errors.
2278 *********************************************************************/
2279 static char *get_request_line(struct client_state *csp)
2281 char buf[BUFFER_SIZE];
2282 char *request_line = NULL;
2285 memset(buf, 0, sizeof(buf));
2289 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2291 log_error(LOG_LEVEL_ERROR,
2292 "Stopped waiting for the request line.");
2293 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2294 strlen(CONNECTION_TIMEOUT_RESPONSE));
2298 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2300 if (len <= 0) return NULL;
2303 * If there is no memory left for buffering the
2304 * request, there is nothing we can do but hang up
2306 if (add_to_iob(csp, buf, len))
2311 request_line = get_header(csp->iob);
2313 } while ((NULL != request_line) && ('\0' == *request_line));
2315 return request_line;
2320 /*********************************************************************
2322 * Function : receive_client_request
2324 * Description : Read the client's request (more precisely the
2325 * client headers) and answer it if necessary.
2327 * Note that since we're not using select() we could get
2328 * blocked here if a client connected, then didn't say
2332 * 1 : csp = Current client state (buffers, headers, etc...)
2334 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
2336 *********************************************************************/
2337 static jb_err receive_client_request(struct client_state *csp)
2339 char buf[BUFFER_SIZE];
2342 struct http_request *http;
2346 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
2347 struct list header_list;
2348 struct list *headers = &header_list;
2352 memset(buf, 0, sizeof(buf));
2354 req = get_request_line(csp);
2357 return JB_ERR_PARSE;
2359 assert(*req != '\0');
2361 if (client_protocol_is_unsupported(csp, req))
2363 return JB_ERR_PARSE;
2366 #ifdef FEATURE_FORCE_LOAD
2368 * If this request contains the FORCE_PREFIX and blocks
2369 * aren't enforced, get rid of it and set the force flag.
2371 if (strstr(req, FORCE_PREFIX))
2373 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2375 log_error(LOG_LEVEL_FORCE,
2376 "Ignored force prefix in request: \"%s\".", req);
2380 strclean(req, FORCE_PREFIX);
2381 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2382 csp->flags |= CSP_FLAG_FORCED;
2385 #endif /* def FEATURE_FORCE_LOAD */
2387 err = parse_http_request(req, http);
2389 if (JB_ERR_OK != err)
2391 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2392 /* XXX: Use correct size */
2393 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2394 log_error(LOG_LEVEL_ERROR,
2395 "Couldn't parse request line received from %s: %s",
2396 csp->ip_addr_str, jb_err_to_string(err));
2398 free_http_request(http);
2399 return JB_ERR_PARSE;
2402 /* grab the rest of the client's headers */
2406 p = get_header(csp->iob);
2410 /* There are no additional headers to read. */
2417 * We didn't receive a complete header
2418 * line yet, get the rest of it.
2420 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2422 log_error(LOG_LEVEL_ERROR,
2423 "Stopped grabbing the client headers.");
2424 return JB_ERR_PARSE;
2427 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2430 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2431 destroy_list(headers);
2432 return JB_ERR_PARSE;
2435 if (add_to_iob(csp, buf, len))
2438 * If there is no memory left for buffering the
2439 * request, there is nothing we can do but hang up
2441 destroy_list(headers);
2442 return JB_ERR_MEMORY;
2448 * We were able to read a complete
2449 * header and can finaly enlist it.
2456 if (http->host == NULL)
2459 * If we still don't know the request destination,
2460 * the request is invalid or the client uses
2461 * Privoxy without its knowledge.
2463 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2466 * Our attempts to get the request destination
2467 * elsewhere failed or Privoxy is configured
2468 * to only accept proxy requests.
2470 * An error response has already been send
2471 * and we're done here.
2473 return JB_ERR_PARSE;
2478 * Determine the actions for this URL
2480 #ifdef FEATURE_TOGGLE
2481 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2483 /* Most compatible set of actions (i.e. none) */
2484 init_current_action(csp->action);
2487 #endif /* ndef FEATURE_TOGGLE */
2489 get_url_actions(csp, http);
2493 * Save a copy of the original request for logging
2495 http->ocmd = strdup(http->cmd);
2496 if (http->ocmd == NULL)
2498 log_error(LOG_LEVEL_FATAL,
2499 "Out of memory copying HTTP request line");
2501 enlist(csp->headers, http->cmd);
2503 /* Append the previously read headers */
2504 list_append_list_unique(csp->headers, headers);
2505 destroy_list(headers);
2512 /*********************************************************************
2514 * Function : parse_client_request
2516 * Description : Parses the client's request and decides what to do
2519 * Note that since we're not using select() we could get
2520 * blocked here if a client connected, then didn't say
2524 * 1 : csp = Current client state (buffers, headers, etc...)
2526 * Returns : JB_ERR_OK or JB_ERR_PARSE
2528 *********************************************************************/
2529 static jb_err parse_client_request(struct client_state *csp)
2531 struct http_request *http = csp->http;
2534 err = sed(csp, FILTER_CLIENT_HEADERS);
2535 if (JB_ERR_OK != err)
2537 /* XXX: Should be handled in sed(). */
2538 assert(err == JB_ERR_PARSE);
2539 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
2541 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2543 /* Check request line for rewrites. */
2544 if ((NULL == csp->headers->first->str)
2545 || (strcmp(http->cmd, csp->headers->first->str) &&
2546 (JB_ERR_OK != change_request_destination(csp))))
2549 * A header filter broke the request line - bail out.
2551 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2552 /* XXX: Use correct size */
2553 log_error(LOG_LEVEL_CLF,
2554 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2555 log_error(LOG_LEVEL_ERROR,
2556 "Invalid request line after applying header filters.");
2557 free_http_request(http);
2559 return JB_ERR_PARSE;
2567 /*********************************************************************
2571 * Description : Once a connection to the client has been accepted,
2572 * this function is called (via serve()) to handle the
2573 * main business of the communication. When this
2574 * function returns, the caller must close the client
2577 * FIXME: chat is nearly thousand lines long.
2581 * 1 : csp = Current client state (buffers, headers, etc...)
2583 * Returns : Nothing.
2585 *********************************************************************/
2586 static void chat(struct client_state *csp)
2588 char buf[BUFFER_SIZE];
2595 int ms_iis5_hack = 0;
2596 unsigned long long byte_count = 0;
2597 int forwarded_connect_retries = 0;
2598 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
2599 const struct forward_spec *fwd;
2600 struct http_request *http;
2601 long len = 0; /* for buffer sizes (and negative error codes) */
2603 /* Function that does the content filtering for the current request */
2604 filter_function_ptr content_filter = NULL;
2606 /* Skeleton for HTTP response, if we should intercept the request */
2607 struct http_response *rsp;
2608 struct timeval timeout;
2610 memset(buf, 0, sizeof(buf));
2614 if (receive_client_request(csp) != JB_ERR_OK)
2618 if (parse_client_request(csp) != JB_ERR_OK)
2623 /* decide how to route the HTTP request */
2624 fwd = forward_url(csp, http);
2627 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2628 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2633 * build the http request to send to the server
2634 * we have to do one of the following:
2636 * create = use the original HTTP request to create a new
2637 * HTTP request that has either the path component
2638 * without the http://domainspec (w/path) or the
2639 * full orininal URL (w/url)
2640 * Note that the path and/or the HTTP version may
2641 * have been altered by now.
2643 * connect = Open a socket to the host:port of the server
2644 * and short-circuit server and client socket.
2646 * pass = Pass the request unchanged if forwarding a CONNECT
2647 * request to a parent proxy. Note that we'll be sending
2648 * the CFAIL message ourselves if connecting to the parent
2649 * fails, but we won't send a CSUCCEED message if it works,
2650 * since that would result in a double message (ours and the
2651 * parent's). After sending the request to the parent, we simply
2654 * here's the matrix:
2657 * +--------+--------+
2659 * 0 | create | connect|
2661 * Forwarding +--------+--------+
2663 * 1 | create | pass |
2665 * +--------+--------+
2669 if (http->ssl && connect_port_is_forbidden(csp))
2671 const char *acceptable_connect_ports =
2672 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2673 assert(NULL != acceptable_connect_ports);
2674 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2675 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2676 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2677 csp->action->flags |= ACTION_BLOCK;
2683 freez(csp->headers->first->str);
2684 build_request_line(csp, fwd, &csp->headers->first->str);
2688 * We have a request. Check if one of the crunchers wants it.
2690 if (crunch_response_triggered(csp, crunchers_all))
2693 * Yes. The client got the crunch response
2694 * and we are done here after cleaning up.
2696 /* XXX: why list_remove_all()? */
2697 list_remove_all(csp->headers);
2702 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2704 if (fwd->forward_host)
2706 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2707 fwd->forward_host, fwd->forward_port, http->hostport);
2711 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2714 /* here we connect to the server, gateway, or the forwarder */
2716 while ((csp->sfd = forwarded_connect(fwd, http, csp))
2717 && (errno == EINVAL)
2718 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2720 log_error(LOG_LEVEL_ERROR,
2721 "failed request #%u to connect to %s. Trying again.",
2722 forwarded_connect_retries, http->hostport);
2725 if (csp->sfd == JB_INVALID_SOCKET)
2727 if (fwd->type != SOCKS_NONE)
2730 rsp = error_response(csp, "forwarding-failed", errno);
2732 else if (errno == EINVAL)
2734 rsp = error_response(csp, "no-such-domain", errno);
2738 rsp = error_response(csp, "connect-failed", errno);
2739 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2743 /* Write the answer to the client */
2746 send_crunch_response(csp, rsp);
2752 hdr = list_to_text(csp->headers);
2755 /* FIXME Should handle error properly */
2756 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2758 list_remove_all(csp->headers);
2760 if (fwd->forward_host || (http->ssl == 0))
2763 * Write the client's (modified) header to the server
2764 * (along with anything else that may be in the buffer)
2766 if (write_socket(csp->sfd, hdr, strlen(hdr))
2767 || (flush_socket(csp->sfd, csp->iob) < 0))
2769 log_error(LOG_LEVEL_CONNECT,
2770 "write header to: %s failed: %E", http->hostport);
2772 rsp = error_response(csp, "connect-failed", errno);
2775 send_crunch_response(csp, rsp);
2785 * We're running an SSL tunnel and we're not forwarding,
2786 * so just send the "connect succeeded" message to the
2787 * client, flush the rest, and get out of the way.
2789 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2797 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2799 /* we're finished with the client's header */
2802 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
2804 /* pass data between the client and server
2805 * until one or the other shuts down the connection.
2814 * FD_ZERO here seems to point to an errant macro which crashes.
2815 * So do this by hand for now...
2817 memset(&rfds,0x00,sizeof(fd_set));
2821 FD_SET(csp->cfd, &rfds);
2822 FD_SET(csp->sfd, &rfds);
2824 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2825 if ((csp->flags & CSP_FLAG_CHUNKED)
2826 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2827 && ((csp->iob->eod - csp->iob->cur) >= 5)
2828 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2830 log_error(LOG_LEVEL_CONNECT,
2831 "Looks like we read the last chunk together with "
2832 "the server headers. We better stop reading.");
2833 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2834 csp->expected_content_length = byte_count;
2835 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2837 if (server_body && server_response_is_complete(csp, byte_count))
2839 log_error(LOG_LEVEL_CONNECT,
2840 "Done reading from server. Expected content length: %llu. "
2841 "Actual content length: %llu. Most recently received: %d.",
2842 csp->expected_content_length, byte_count, len);
2845 * XXX: should not jump around,
2846 * chat() is complicated enough already.
2850 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2852 timeout.tv_sec = csp->config->socket_timeout;
2853 timeout.tv_usec = 0;
2854 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
2858 log_error(LOG_LEVEL_ERROR,
2859 "Didn't receive data in time: %s", http->url);
2860 if ((byte_count == 0) && (http->ssl == 0))
2862 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2863 strlen(CONNECTION_TIMEOUT_RESPONSE));
2865 mark_server_socket_tainted(csp);
2870 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2871 mark_server_socket_tainted(csp);
2876 * This is the body of the browser's request,
2877 * just read and write it.
2879 if (FD_ISSET(csp->cfd, &rfds))
2881 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2885 /* XXX: not sure if this is necessary. */
2886 mark_server_socket_tainted(csp);
2887 break; /* "game over, man" */
2890 if (write_socket(csp->sfd, buf, (size_t)len))
2892 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2893 mark_server_socket_tainted(csp);
2900 * The server wants to talk. It could be the header or the body.
2901 * If `hdr' is null, then it's the header otherwise it's the body.
2902 * FIXME: Does `hdr' really mean `host'? No.
2904 if (FD_ISSET(csp->sfd, &rfds))
2907 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2911 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2913 if (http->ssl && (fwd->forward_host == NULL))
2916 * Just hang up. We already confirmed the client's CONNECT
2917 * request with status code 200 and unencrypted content is
2918 * no longer welcome.
2920 log_error(LOG_LEVEL_ERROR,
2921 "CONNECT already confirmed. Unable to tell the client about the problem.");
2924 else if (byte_count)
2927 * Just hang up. We already transmitted the original headers
2928 * and parts of the original content and therefore missed the
2929 * chance to send an error message (without risking data corruption).
2931 * XXX: we could retry with a fancy range request here.
2933 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2934 "Unable to tell the client about the problem.");
2935 mark_server_socket_tainted(csp);
2939 rsp = error_response(csp, "connect-failed", errno);
2942 send_crunch_response(csp, rsp);
2948 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2949 if (csp->flags & CSP_FLAG_CHUNKED)
2951 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
2953 /* XXX: this is a temporary hack */
2954 log_error(LOG_LEVEL_CONNECT,
2955 "Looks like we reached the end of the last chunk. "
2956 "We better stop reading.");
2957 csp->expected_content_length = byte_count + (unsigned long long)len;
2958 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2962 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2965 * Add a trailing zero to let be able to use string operations.
2966 * XXX: do we still need this with filter_popups gone?
2971 * Normally, this would indicate that we've read
2972 * as much as the server has sent us and we can
2973 * close the client connection. However, Microsoft
2974 * in its wisdom has released IIS/5 with a bug that
2975 * prevents it from sending the trailing \r\n in
2976 * a 302 redirect header (and possibly other headers).
2977 * To work around this if we've haven't parsed
2978 * a full header we'll append a trailing \r\n
2979 * and see if this now generates a valid one.
2981 * This hack shouldn't have any impacts. If we've
2982 * already transmitted the header or if this is a
2983 * SSL connection, then we won't bother with this
2984 * hack. So we only work on partially received
2985 * headers. If we append a \r\n and this still
2986 * doesn't generate a valid header, then we won't
2987 * transmit anything to the client.
2992 if (server_body || http->ssl)
2995 * If we have been buffering up the document,
2996 * now is the time to apply content modification
2997 * and send the result to the client.
3001 p = execute_content_filter(csp, content_filter);
3003 * If the content filter fails, use the original
3004 * buffer and length.
3005 * (see p != NULL ? p : csp->iob->cur below)
3009 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3012 if (JB_ERR_OK != update_server_headers(csp))
3014 log_error(LOG_LEVEL_FATAL,
3015 "Failed to update server headers. after filtering.");
3018 hdr = list_to_text(csp->headers);
3021 /* FIXME Should handle error properly */
3022 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3025 if (write_socket(csp->cfd, hdr, strlen(hdr))
3026 || write_socket(csp->cfd,
3027 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
3029 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3032 mark_server_socket_tainted(csp);
3040 break; /* "game over, man" */
3044 * This is NOT the body, so
3045 * Let's pretend the server just sent us a blank line.
3047 snprintf(buf, sizeof(buf), "\r\n");
3048 len = (int)strlen(buf);
3051 * Now, let the normal header parsing algorithm below do its
3052 * job. If it fails, we'll exit instead of continuing.
3059 * If this is an SSL connection or we're in the body
3060 * of the server document, just write it to the client,
3061 * unless we need to buffer the body for later content-filtering
3063 if (server_body || http->ssl)
3068 * If there is no memory left for buffering the content, or the buffer limit
3069 * has been reached, switch to non-filtering mode, i.e. make & write the
3070 * header, flush the iob and buf, and get out of the way.
3072 if (add_to_iob(csp, buf, len))
3077 log_error(LOG_LEVEL_INFO,
3078 "Flushing header and buffers. Stepping back from filtering.");
3080 hdr = list_to_text(csp->headers);
3084 * Memory is too tight to even generate the header.
3085 * Send our static "Out-of-memory" page.
3087 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3088 rsp = cgi_error_memory();
3089 send_crunch_response(csp, rsp);
3090 mark_server_socket_tainted(csp);
3093 hdrlen = strlen(hdr);
3095 if (write_socket(csp->cfd, hdr, hdrlen)
3096 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
3097 || (write_socket(csp->cfd, buf, (size_t)len)))
3099 log_error(LOG_LEVEL_CONNECT,
3100 "Flush header and buffers to client failed: %E");
3102 mark_server_socket_tainted(csp);
3107 * Reset the byte_count to the amount of bytes
3108 * we just flushed. len will be added a few lines below,
3109 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3111 byte_count = (unsigned long long)flushed;
3113 content_filter = NULL;
3119 if (write_socket(csp->cfd, buf, (size_t)len))
3121 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3122 mark_server_socket_tainted(csp);
3126 byte_count += (unsigned long long)len;
3131 const char *header_start;
3133 * We're still looking for the end of the server's header.
3134 * Buffer up the data we just read. If that fails, there's
3135 * little we can do but send our static out-of-memory page.
3137 if (add_to_iob(csp, buf, len))
3139 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3140 rsp = cgi_error_memory();
3141 send_crunch_response(csp, rsp);
3142 mark_server_socket_tainted(csp);
3146 header_start = csp->iob->cur;
3148 /* Convert iob into something sed() can digest */
3149 if (JB_ERR_PARSE == get_server_headers(csp))
3154 * Well, we tried our MS IIS/5 hack and it didn't work.
3155 * The header is incomplete and there isn't anything
3156 * we can do about it.
3158 log_error(LOG_LEVEL_INFO,
3159 "MS IIS5 hack didn't produce valid headers.");
3165 * Since we have to wait for more from the server before
3166 * we can parse the headers we just continue here.
3168 long header_offset = csp->iob->cur - header_start;
3169 assert(csp->iob->cur >= header_start);
3170 byte_count += (unsigned long long)(len - header_offset);
3171 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
3172 "byte_count: %llu. header_offset: %d. len: %d.",
3173 byte_count, header_offset, len);
3178 /* Did we actually get anything? */
3179 if (NULL == csp->headers->first)
3181 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
3182 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3183 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
3184 free_http_request(http);
3185 mark_server_socket_tainted(csp);
3189 assert(csp->headers->first->str);
3191 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3192 strncmpic(csp->headers->first->str, "ICY", 3))
3195 * It doesn't look like a HTTP (or Shoutcast) response:
3196 * tell the client and log the problem.
3198 if (strlen(csp->headers->first->str) > 30)
3200 csp->headers->first->str[30] = '\0';
3202 log_error(LOG_LEVEL_ERROR,
3203 "Invalid server or forwarder response. Starts with: %s",
3204 csp->headers->first->str);
3205 log_error(LOG_LEVEL_CLF,
3206 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3207 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3208 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3209 free_http_request(http);
3210 mark_server_socket_tainted(csp);
3215 * We have now received the entire server header,
3216 * filter it and send the result to the client
3218 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3220 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
3222 hdr = list_to_text(csp->headers);
3225 /* FIXME Should handle error properly */
3226 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3229 if (crunch_response_triggered(csp, crunchers_light))
3232 * One of the tags created by a server-header
3233 * tagger triggered a crunch. We already
3234 * delivered the crunch response to the client
3235 * and are done here after cleaning up.
3238 mark_server_socket_tainted(csp);
3241 /* Buffer and pcrs filter this if appropriate. */
3243 if (!http->ssl) /* We talk plaintext */
3245 content_filter = get_filter_function(csp);
3248 * Only write if we're not buffering for content modification
3250 if (!content_filter)
3253 * Write the server's (modified) header to
3254 * the client (along with anything else that
3255 * may be in the buffer)
3258 if (write_socket(csp->cfd, hdr, strlen(hdr))
3259 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
3261 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
3264 * The write failed, so don't bother mentioning it
3265 * to the client... it probably can't hear us anyway.
3268 mark_server_socket_tainted(csp);
3272 byte_count += (unsigned long long)len;
3277 * XXX: the header lenght should probably
3278 * be calculated by get_server_headers().
3280 long header_length = csp->iob->cur - header_start;
3281 assert(csp->iob->cur > header_start);
3282 byte_count += (unsigned long long)(len - header_length);
3285 /* we're finished with the server's header */
3291 * If this was a MS IIS/5 hack then it means the server
3292 * has already closed the connection. Nothing more to read.
3297 log_error(LOG_LEVEL_INFO,
3298 "Closed server connection detected with MS IIS5 hack enabled.");
3304 mark_server_socket_tainted(csp);
3305 return; /* huh? we should never get here */
3308 if (csp->content_length == 0)
3311 * If Privoxy didn't recalculate the Content-Lenght,
3312 * byte_count is still correct.
3314 csp->content_length = byte_count;
3317 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3318 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3319 && (csp->expected_content_length != byte_count))
3321 log_error(LOG_LEVEL_CONNECT,
3322 "Received %llu bytes while expecting %llu.",
3323 byte_count, csp->expected_content_length);
3324 mark_server_socket_tainted(csp);
3328 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3329 csp->ip_addr_str, http->ocmd, csp->content_length);
3333 /*********************************************************************
3337 * Description : This is little more than chat. We only "serve" to
3338 * to close any socket that chat may have opened.
3341 * 1 : csp = Current client state (buffers, headers, etc...)
3345 *********************************************************************/
3347 void serve(struct client_state *csp)
3348 #else /* ifndef AMIGA */
3349 static void serve(struct client_state *csp)
3350 #endif /* def AMIGA */
3353 close_socket(csp->cfd);
3355 if (csp->sfd != JB_INVALID_SOCKET)
3357 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3358 static int monitor_thread_running = 0;
3360 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
3361 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
3363 remember_connection(csp->sfd, csp->http, forward_url(csp, csp->http));
3364 privoxy_mutex_lock(&connection_reuse_mutex);
3365 if (!monitor_thread_running)
3367 monitor_thread_running = 1;
3368 privoxy_mutex_unlock(&connection_reuse_mutex);
3369 wait_for_alive_connections();
3370 privoxy_mutex_lock(&connection_reuse_mutex);
3371 monitor_thread_running = 0;
3373 privoxy_mutex_unlock(&connection_reuse_mutex);
3377 forget_connection(csp->sfd);
3378 close_socket(csp->sfd);
3381 close_socket(csp->sfd);
3382 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3385 csp->flags &= ~CSP_FLAG_ACTIVE;
3391 /*********************************************************************
3393 * Function : server_thread
3395 * Description : We only exist to call `serve' in a threaded environment.
3398 * 1 : data = Current client state (buffers, headers, etc...)
3400 * Returns : Always 0.
3402 *********************************************************************/
3403 static int32 server_thread(void *data)
3405 serve((struct client_state *) data);
3412 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3413 /*********************************************************************
3417 * Description : Print usage info & exit.
3419 * Parameters : Pointer to argv[0] for identifying ourselves
3423 *********************************************************************/
3424 static void usage(const char *myname)
3426 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
3430 #endif /* defined(unix) */
3433 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
3434 #endif /* defined(unix) */
3435 "[--version] [configfile]\n"
3436 "Aborting\n", myname);
3441 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
3444 #ifdef MUTEX_LOCKS_AVAILABLE
3445 /*********************************************************************
3447 * Function : privoxy_mutex_lock
3449 * Description : Locks a mutex.
3452 * 1 : mutex = The mutex to lock.
3454 * Returns : Void. May exit in case of errors.
3456 *********************************************************************/
3457 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
3459 #ifdef FEATURE_PTHREAD
3460 int err = pthread_mutex_lock(mutex);
3463 if (mutex != &log_mutex)
3465 log_error(LOG_LEVEL_FATAL,
3466 "Mutex locking failed: %s.\n", strerror(err));
3471 EnterCriticalSection(mutex);
3472 #endif /* def FEATURE_PTHREAD */
3476 /*********************************************************************
3478 * Function : privoxy_mutex_unlock
3480 * Description : Unlocks a mutex.
3483 * 1 : mutex = The mutex to unlock.
3485 * Returns : Void. May exit in case of errors.
3487 *********************************************************************/
3488 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
3490 #ifdef FEATURE_PTHREAD
3491 int err = pthread_mutex_unlock(mutex);
3494 if (mutex != &log_mutex)
3496 log_error(LOG_LEVEL_FATAL,
3497 "Mutex unlocking failed: %s.\n", strerror(err));
3502 LeaveCriticalSection(mutex);
3503 #endif /* def FEATURE_PTHREAD */
3507 /*********************************************************************
3509 * Function : privoxy_mutex_init
3511 * Description : Prepares a mutex.
3514 * 1 : mutex = The mutex to initialize.
3516 * Returns : Void. May exit in case of errors.
3518 *********************************************************************/
3519 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
3521 #ifdef FEATURE_PTHREAD
3522 int err = pthread_mutex_init(mutex, 0);
3525 printf("Fatal error. Mutex initialization failed: %s.\n",
3530 InitializeCriticalSection(mutex);
3531 #endif /* def FEATURE_PTHREAD */
3533 #endif /* def MUTEX_LOCKS_AVAILABLE */
3535 /*********************************************************************
3537 * Function : initialize_mutexes
3539 * Description : Prepares mutexes if mutex support is available.
3543 * Returns : Void, exits in case of errors.
3545 *********************************************************************/
3546 static void initialize_mutexes(void)
3548 #ifdef MUTEX_LOCKS_AVAILABLE
3550 * Prepare global mutex semaphores
3552 privoxy_mutex_init(&log_mutex);
3553 privoxy_mutex_init(&log_init_mutex);
3554 privoxy_mutex_init(&connection_reuse_mutex);
3557 * XXX: The assumptions below are a bit naive
3558 * and can cause locks that aren't necessary.
3560 * For example older FreeBSD versions (< 6.x?)
3561 * have no gethostbyname_r, but gethostbyname is
3564 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
3565 privoxy_mutex_init(&resolver_mutex);
3566 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
3568 * XXX: should we use a single mutex for
3569 * localtime() and gmtime() as well?
3571 #ifndef HAVE_GMTIME_R
3572 privoxy_mutex_init(&gmtime_mutex);
3573 #endif /* ndef HAVE_GMTIME_R */
3575 #ifndef HAVE_LOCALTIME_R
3576 privoxy_mutex_init(&localtime_mutex);
3577 #endif /* ndef HAVE_GMTIME_R */
3580 privoxy_mutex_init(&rand_mutex);
3581 #endif /* ndef HAVE_RANDOM */
3582 #endif /* def MUTEX_LOCKS_AVAILABLE */
3586 /*********************************************************************
3590 * Description : Load the config file and start the listen loop.
3591 * This function is a lot more *sane* with the `load_config'
3592 * and `listen_loop' functions; although it stills does
3593 * a *little* too much for my taste.
3596 * 1 : argc = Number of parameters (including $0).
3597 * 2 : argv = Array of (char *)'s to the parameters.
3599 * Returns : 1 if : can't open config file, unrecognized directive,
3600 * stats requested in multi-thread mode, can't open the
3601 * log file, can't open the jar file, listen port is invalid,
3602 * any load fails, and can't bind port.
3604 * Else main never returns, the process must be signaled
3605 * to terminate execution. Or, on Windows, use the
3606 * "File", "Exit" menu option.
3608 *********************************************************************/
3610 int real_main(int argc, const char *argv[])
3612 int main(int argc, const char *argv[])
3616 unsigned int random_seed;
3618 struct passwd *pw = NULL;
3619 struct group *grp = NULL;
3622 char *pre_chroot_nslookup_to_load_resolver = NULL;
3629 #if !defined(_WIN32)
3636 /* Prepare mutexes if supported and necessary. */
3637 initialize_mutexes();
3639 /* Enable logging until further notice. */
3643 * Parse the command line arguments
3645 * XXX: simply printing usage information in case of
3646 * invalid arguments isn't particularly user friendly.
3648 while (++argc_pos < argc)
3651 /* Check to see if the service must be installed or uninstalled */
3652 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3654 const char *pName = argv[argc_pos] + 9;
3657 exit( (install_service(pName)) ? 0 : 1 );
3659 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3661 const char *pName = argv[argc_pos] + 11;
3664 exit((uninstall_service(pName)) ? 0 : 1);
3666 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3668 bRunAsService = TRUE;
3669 w32_set_service_cwd();
3670 atexit(w32_service_exit_notify);
3673 #endif /* defined(_WIN32) */
3676 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3678 if (strcmp(argv[argc_pos], "--help") == 0)
3683 else if(strcmp(argv[argc_pos], "--version") == 0)
3685 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3691 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3693 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
3697 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3699 if (++argc_pos == argc) usage(argv[0]);
3700 pidfile = strdup(argv[argc_pos]);
3703 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3705 if (++argc_pos == argc) usage(argv[argc_pos]);
3707 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3710 if (NULL == (grp = getgrnam(p)))
3712 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3716 if (NULL == (pw = getpwnam(argv[argc_pos])))
3718 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3721 if (p != NULL) *--p = '\0';
3724 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3726 if (++argc_pos == argc) usage(argv[0]);
3727 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3730 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3734 #endif /* defined(unix) */
3736 else if (argc_pos + 1 != argc)
3739 * This is neither the last command line
3740 * option, nor was it recognized before,
3741 * therefore it must be invalid.
3747 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3749 configfile = argv[argc_pos];
3752 } /* -END- while (more arguments) */
3754 show_version(Argv[0]);
3757 if ( *configfile != '/' )
3759 char cwd[BUFFER_SIZE];
3761 size_t abs_file_size;
3763 /* make config-filename absolute here */
3764 if (NULL == getcwd(cwd, sizeof(cwd)))
3766 perror("failed to get current working directory");
3771 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3772 basedir = strdup(cwd);
3774 if (NULL == basedir ||
3775 NULL == (abs_file = malloc(abs_file_size)))
3777 perror("malloc failed");
3780 strlcpy(abs_file, basedir, abs_file_size);
3781 strlcat(abs_file, "/", abs_file_size );
3782 strlcat(abs_file, configfile, abs_file_size);
3783 configfile = abs_file;
3785 #endif /* defined unix */
3789 clients->next = NULL;
3791 /* XXX: factor out initialising after the next stable release. */
3794 #elif defined(_WIN32)
3798 random_seed = (unsigned int)time(NULL);
3800 srandom(random_seed);
3803 #endif /* ifdef HAVE_RANDOM */
3806 * Unix signal handling
3808 * Catch the abort, interrupt and terminate signals for a graceful exit
3809 * Catch the hangup signal so the errlog can be reopened.
3810 * Ignore the broken pipe signals (FIXME: Why?)
3812 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3815 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3816 const int ignored_signals[] = { SIGPIPE, 0 };
3818 for (idx = 0; catched_signals[idx] != 0; idx++)
3820 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3821 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3823 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3824 #endif /* ifdef sun */
3826 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3830 for (idx = 0; ignored_signals[idx] != 0; idx++)
3832 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3834 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3839 #else /* ifdef _WIN32 */
3840 # ifdef _WIN_CONSOLE
3842 * We *are* in a windows console app.
3843 * Print a verbose messages about FAQ's and such
3845 printf("%s", win32_blurb);
3846 # endif /* def _WIN_CONSOLE */
3847 #endif /* def _WIN32 */
3850 /* Initialize the CGI subsystem */
3851 cgi_init_error_messages();
3854 * If runnig on unix and without the --nodaemon
3855 * option, become a daemon. I.e. fork, detach
3856 * from tty and get process group leadership
3869 if ( pid < 0 ) /* error */
3874 else if ( pid != 0 ) /* parent */
3879 * must check for errors
3880 * child died due to missing files aso
3883 wpid = waitpid( pid, &status, WNOHANG );
3892 /* Should be more portable, but not as well tested */
3897 #else /* ndef __FreeBSD__ */
3899 #endif /* ndef __FreeBSD__ */
3900 fd = open("/dev/tty", O_RDONLY);
3903 /* no error check here */
3904 ioctl( fd, TIOCNOTTY,0 );
3909 * stderr (fd 2) will be closed later on, when the
3910 * log file has been parsed.
3917 } /* -END- if (!no_daemon) */
3920 * As soon as we have written the PID file, we can switch
3921 * to the user and group ID indicated by the --user option
3927 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3929 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3933 if (setgroups(1, &grp->gr_gid))
3935 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
3938 else if (initgroups(pw->pw_name, pw->pw_gid))
3940 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
3946 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3948 /* Read the time zone file from /etc before doing chroot. */
3950 if (NULL != pre_chroot_nslookup_to_load_resolver
3951 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3953 /* Initialize resolver library. */
3954 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3956 if (chroot(pw->pw_dir) < 0)
3958 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3962 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3965 if (setuid(pw->pw_uid))
3967 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3971 char putenv_dummy[64];
3973 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3974 if (putenv(putenv_dummy) != 0)
3976 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3979 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3980 if (putenv(putenv_dummy) != 0)
3982 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3988 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3991 #endif /* defined unix */
3994 /* This will be FALSE unless the command line specified --service
3998 /* Yup, so now we must attempt to establish a connection
3999 * with the service dispatcher. This will only work if this
4000 * process was launched by the service control manager to
4001 * actually run as a service. If this isn't the case, i've
4002 * known it take around 30 seconds or so for the call to return.
4005 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
4006 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
4008 /* Service has run, and at this point is now being stopped, so just return */
4013 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
4015 /* An error occurred. Usually it's because --service was wrongly specified
4016 * and we were unable to connect to the Service Control Dispatcher because
4017 * it wasn't expecting us and is therefore not listening.
4019 * For now, just continue below to call the listen_loop function.
4022 #endif /* def _WIN32 */
4032 /*********************************************************************
4034 * Function : bind_port_helper
4036 * Description : Bind the listen port. Handles logging, and aborts
4040 * 1 : config = Privoxy configuration. Specifies port
4043 * Returns : Port that was opened.
4045 *********************************************************************/
4046 static jb_socket bind_port_helper(struct configuration_spec * config)
4051 if (config->haddr == NULL)
4053 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
4058 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
4059 config->hport, config->haddr);
4062 result = bind_port(config->haddr, config->hport, &bfd);
4069 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4070 "There may be another Privoxy or some other "
4071 "proxy running on port %d",
4072 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
4073 config->hport, config->hport);
4076 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4077 "The hostname is not resolvable",
4078 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4081 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
4082 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4085 /* shouldn't get here */
4086 return JB_INVALID_SOCKET;
4089 config->need_bind = 0;
4096 /* Without this simple workaround we get this compiler warning from _beginthread
4097 * warning C4028: formal parameter 1 different from declaration
4099 void w32_service_listen_loop(void *p)
4103 #endif /* def _WIN32 */
4106 /*********************************************************************
4108 * Function : listen_loop
4110 * Description : bind the listen port and enter a "FOREVER" listening loop.
4116 *********************************************************************/
4117 static void listen_loop(void)
4119 struct client_state *csp = NULL;
4121 struct configuration_spec * config;
4123 config = load_config();
4125 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4127 * XXX: Should be relocated once it no
4128 * longer needs to emit log messages.
4130 initialize_reusable_connections();
4131 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4133 bfd = bind_port_helper(config);
4135 #ifdef FEATURE_GRACEFUL_TERMINATION
4136 while (!g_terminate)
4141 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
4142 while (waitpid(-1, NULL, WNOHANG) > 0)
4144 /* zombie children */
4146 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
4149 * Free data that was used by died threads
4155 * Re-open the errlog after HUP signal
4157 if (received_hup_signal)
4159 if (NULL != config->logfile)
4161 init_error_log(Argv[0], config->logfile);
4163 received_hup_signal = 0;
4167 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
4169 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
4173 csp->flags |= CSP_FLAG_ACTIVE;
4174 csp->sfd = JB_INVALID_SOCKET;
4176 csp->config = config = load_config();
4178 if ( config->need_bind )
4181 * Since we were listening to the "old port", we will not see
4182 * a "listen" param change until the next IJB request. So, at
4183 * least 1 more request must be made for us to find the new
4184 * setting. I am simply closing the old socket and binding the
4187 * Which-ever is correct, we will serve 1 more page via the
4188 * old settings. This should probably be a "show-proxy-args"
4189 * request. This should not be a so common of an operation
4190 * that this will hurt people's feelings.
4195 bfd = bind_port_helper(config);
4198 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
4200 if (!accept_connection(csp, bfd))
4202 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
4215 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
4218 #ifdef FEATURE_TOGGLE
4219 if (global_toggle_state)
4220 #endif /* def FEATURE_TOGGLE */
4222 csp->flags |= CSP_FLAG_TOGGLED_ON;
4225 if (run_loader(csp))
4227 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
4228 /* Never get here - LOG_LEVEL_FATAL causes program exit */
4232 if (block_acl(NULL,csp))
4234 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
4235 close_socket(csp->cfd);
4239 #endif /* def FEATURE_ACL */
4241 /* add it to the list of clients */
4242 csp->next = clients->next;
4243 clients->next = csp;
4245 if (config->multi_threaded)
4249 /* this is a switch () statment in the C preprocessor - ugh */
4250 #undef SELECTED_ONE_OPTION
4252 /* Use Pthreads in preference to native code */
4253 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
4254 #define SELECTED_ONE_OPTION
4256 pthread_t the_thread;
4257 pthread_attr_t attrs;
4259 pthread_attr_init(&attrs);
4260 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
4261 errno = pthread_create(&the_thread, &attrs,
4262 (void * (*)(void *))serve, csp);
4263 child_id = errno ? -1 : 0;
4264 pthread_attr_destroy(&attrs);
4268 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
4269 #define SELECTED_ONE_OPTION
4270 child_id = _beginthread(
4271 (void (*)(void *))serve,
4276 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
4277 #define SELECTED_ONE_OPTION
4278 child_id = _beginthread(
4279 (void(* _Optlink)(void*))serve,
4285 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
4286 #define SELECTED_ONE_OPTION
4288 thread_id tid = spawn_thread
4289 (server_thread, "server", B_NORMAL_PRIORITY, csp);
4291 if ((tid >= 0) && (resume_thread(tid) == B_OK))
4293 child_id = (int) tid;
4302 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
4303 #define SELECTED_ONE_OPTION
4304 csp->cfd = ReleaseSocket(csp->cfd, -1);
4307 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4308 NP_Output, Output(),
4309 NP_CloseOutput, FALSE,
4310 NP_Name, (ULONG)"privoxy child",
4314 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4315 NP_Output, Output(),
4316 NP_CloseOutput, FALSE,
4317 NP_Name, (ULONG)"privoxy child",
4318 NP_StackSize, 200*1024,
4324 ((struct Task *)child_id)->tc_UserData = csp;
4325 Signal((struct Task *)child_id, SIGF_SINGLE);
4330 #if !defined(SELECTED_ONE_OPTION)
4333 /* This block is only needed when using fork().
4334 * When using threads, the server thread was
4335 * created and run by the call to _beginthread().
4337 if (child_id == 0) /* child */
4340 #ifdef FEATURE_TOGGLE
4341 int inherited_toggle_state = global_toggle_state;
4342 #endif /* def FEATURE_TOGGLE */
4347 * If we've been toggled or we've blocked the request, tell Mom
4350 #ifdef FEATURE_TOGGLE
4351 if (inherited_toggle_state != global_toggle_state)
4353 rc |= RC_FLAG_TOGGLED;
4355 #endif /* def FEATURE_TOGGLE */
4357 #ifdef FEATURE_STATISTICS
4358 if (csp->flags & CSP_FLAG_REJECTED)
4360 rc |= RC_FLAG_BLOCKED;
4362 #endif /* ndef FEATURE_STATISTICS */
4366 else if (child_id > 0) /* parent */
4368 /* in a fork()'d environment, the parent's
4369 * copy of the client socket and the CSP
4373 #if !defined(_WIN32) && !defined(__CYGWIN__)
4375 wait( &child_status );
4378 * Evaluate child's return code: If the child has
4379 * - been toggled, toggle ourselves
4380 * - blocked its request, bump up the stats counter
4383 #ifdef FEATURE_TOGGLE
4384 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
4386 global_toggle_state = !global_toggle_state;
4388 #endif /* def FEATURE_TOGGLE */
4390 #ifdef FEATURE_STATISTICS
4392 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
4396 #endif /* def FEATURE_STATISTICS */
4398 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
4399 close_socket(csp->cfd);
4400 csp->flags &= ~CSP_FLAG_ACTIVE;
4404 #undef SELECTED_ONE_OPTION
4405 /* end of cpp switch () */
4407 if (child_id < 0) /* failed */
4409 char buf[BUFFER_SIZE];
4411 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
4413 snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
4415 write_socket(csp->cfd, buf, strlen(buf));
4416 close_socket(csp->cfd);
4417 csp->flags &= ~CSP_FLAG_ACTIVE;
4428 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
4430 /* Clean up. Aim: free all memory (no leaks) */
4431 #ifdef FEATURE_GRACEFUL_TERMINATION
4433 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
4435 unload_current_config_file();
4436 unload_current_actions_file();
4437 unload_current_re_filterfile();
4438 #ifdef FEATURE_TRUST
4439 unload_current_trust_file();
4442 if (config->multi_threaded)
4449 } while ((clients->next != NULL) && (--i > 0));
4453 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
4464 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
4465 /* Cleanup - remove taskbar icon etc. */
4470 #endif /* FEATURE_GRACEFUL_TERMINATION */