1 const char jcc_rcs[] = "$Id: jcc.c,v 1.248 2009/05/10 10:25:19 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 1.248 2009/05/10 10:25:19 fabiankeil
37 * Change wait_for_alive_connection() prototype to use (void).
39 * Revision 1.247 2009/05/10 10:19:23 fabiankeil
40 * Reenable server-side-only keep-alive support, but only share
41 * outgoing connections if the connection-sharing option is set.
43 * Revision 1.246 2009/05/10 10:12:30 fabiankeil
44 * Initial keep-alive support for the client socket.
45 * Temporarily disable the server-side-only keep-alive code.
47 * Revision 1.245 2009/04/24 15:29:43 fabiankeil
48 * Allow to limit the number of of client connections.
50 * Revision 1.244 2009/04/17 11:34:34 fabiankeil
51 * Style cosmetics for the IPv6 code.
53 * Revision 1.243 2009/04/17 11:27:49 fabiankeil
54 * Petr Pisar's privoxy-3.0.12-ipv6-3.diff.
56 * Revision 1.242 2009/04/11 10:44:47 fabiankeil
57 * Update a comment. We're not in Kansas anymore.
59 * Revision 1.241 2009/04/11 10:37:23 fabiankeil
60 * When dropping connections due to ACL, don't leak csp->ip_addr_str.
62 * Revision 1.240 2009/04/09 10:12:54 fabiankeil
63 * Fix two cases in which an invalid server response would result
64 * in the client connection being closed without sending an error
67 * Revision 1.239 2009/04/07 11:43:50 fabiankeil
68 * If the server rudely resets the connection directly after sending the
69 * headers, pass the mess to the client instead of sending an incorrect
70 * connect-failed message. Fixes #2698674 reported by mybugaccount.
72 * Revision 1.238 2009/03/27 14:42:30 fabiankeil
73 * Correct the status code for CONNECTION_TIMEOUT_RESPONSE.
75 * Revision 1.237 2009/03/27 14:32:04 fabiankeil
76 * If spawning a child in listen_loop() fails, send a real
77 * HTTP response to the client and continue listening for
78 * new connections without artificial delay.
80 * Revision 1.236 2009/03/25 17:30:24 fabiankeil
81 * In serve(), keep the client socket open until we marked the
82 * server socket as unused. This should increase the chances
83 * that we reuse the connection for the client's next request
84 * to the same destination.
86 * Revision 1.235 2009/03/18 21:01:20 fabiankeil
87 * Comment fix. Spotted by Roland.
89 * Revision 1.234 2009/03/18 20:48:42 fabiankeil
90 * If the --no-daemon option is used, enable LOG_LEVEL_INFO
91 * before the config file has been parsed (as we always did).
93 * Revision 1.233 2009/03/13 14:10:07 fabiankeil
94 * Fix some more harmless warnings on amd64.
96 * Revision 1.232 2009/03/08 19:29:16 fabiankeil
97 * Reinitialize the timeout structure every time before passing
98 * it to select(). Apparently some implementations mess with it.
99 * Probably fixes #2669131 reported by cyberpatrol.
101 * Revision 1.231 2009/03/08 14:19:23 fabiankeil
102 * Fix justified (but harmless) compiler warnings
103 * on platforms where sizeof(int) < sizeof(long).
105 * Revision 1.230 2009/03/07 13:09:17 fabiankeil
106 * Change csp->expected_content and_csp->expected_content_length from
107 * size_t to unsigned long long to reduce the likelihood of integer
108 * overflows that would let us close the connection prematurely.
109 * Bug found while investigating #2669131, reported by cyberpatrol.
111 * Revision 1.229 2009/03/07 11:17:01 fabiankeil
112 * Fix compiler warning.
114 * Revision 1.228 2009/03/06 20:30:13 fabiankeil
115 * Log unsigned values as such.
117 * Revision 1.227 2009/03/02 19:18:11 fabiankeil
118 * Streamline parse_http_request()'s prototype. As
119 * cparser pointed out it doesn't actually use csp.
121 * Revision 1.226 2009/03/01 18:28:24 fabiankeil
122 * Help clang understand that we aren't dereferencing
123 * NULL pointers here.
125 * Revision 1.225 2009/02/19 18:09:32 fabiankeil
126 * Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
129 * Revision 1.224 2009/02/14 15:32:04 fabiankeil
130 * Add the request URL to the timeout message in chat().
133 * Revision 1.223 2009/02/09 21:21:16 fabiankeil
134 * Now that init_log_module() is called earlier, call show_version()
135 * later on from main() directly so it doesn't get called for --help
138 * Revision 1.222 2009/02/08 12:56:51 fabiankeil
139 * Call initialize_mutexes() before init_log_module() again.
140 * Broken since r220, might be the cause of Lee's #2579448.
142 * Revision 1.221 2009/02/06 18:02:58 fabiankeil
143 * When dropping privileges, also give up membership in supplementary
144 * groups. Thanks to Matthias Drochner for reporting the problem,
145 * providing the initial patch and testing the final version.
147 * Revision 1.220 2009/02/04 18:29:07 fabiankeil
148 * Initialize the log module before parsing arguments.
149 * Thanks to Matthias Drochner for the report.
151 * Revision 1.219 2009/01/31 16:08:21 fabiankeil
152 * Remove redundant error check in receive_client_request().
154 * Revision 1.218 2009/01/31 12:25:54 fabiankeil
155 * Flatten indentation in receive_client_request().
157 * Revision 1.217 2009/01/07 19:50:09 fabiankeil
158 * - If the socket-timeout has been reached and the client
159 * hasn't received any data yet, send an explanation before
160 * closing the connection.
161 * - In get_request_line(), signal timeouts the right way.
163 * Revision 1.216 2008/12/24 22:13:11 ler762
164 * fix GCC 3.4.4 warning
166 * Revision 1.215 2008/12/24 17:06:19 fabiankeil
167 * Keep a thread around to timeout alive connections
168 * even if no new requests are coming in.
170 * Revision 1.214 2008/12/20 14:53:55 fabiankeil
171 * Add config option socket-timeout to control the time
172 * Privoxy waits for data to arrive on a socket. Useful
173 * in case of stale ssh tunnels or when fuzz-testing.
175 * Revision 1.213 2008/12/15 18:45:51 fabiankeil
176 * When logging crunches, log the whole URL, so one can easily
177 * differentiate between vanilla HTTP and CONNECT requests.
179 * Revision 1.212 2008/12/14 15:46:22 fabiankeil
180 * Give crunched requests their own log level.
182 * Revision 1.211 2008/12/06 10:05:03 fabiankeil
183 * Downgrade "Received x bytes while expecting y." message to
184 * LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
186 * Revision 1.210 2008/12/02 22:03:18 fabiankeil
187 * Don't miscalculate byte_count if we don't get all the
188 * server headers with one read_socket() call. With keep-alive
189 * support enabled, this caused delays until the server closed
192 * Revision 1.209 2008/11/27 09:44:04 fabiankeil
193 * Cosmetics for the last commit: Don't watch out for
194 * the last chunk if the content isn't chunk-encoded or
195 * if we already determined the content length previously.
197 * Revision 1.208 2008/11/26 18:24:17 fabiankeil
198 * Recognize that the server response is complete if the
199 * last chunk is read together with the server headers.
202 * Revision 1.207 2008/11/25 17:25:16 fabiankeil
203 * Don't convert the client-header list to text until we need to.
205 * Revision 1.206 2008/11/23 17:00:11 fabiankeil
206 * Some more chat() cosmetics.
208 * Revision 1.205 2008/11/16 12:43:49 fabiankeil
209 * Turn keep-alive support into a runtime feature
210 * that is disabled by setting keep-alive-timeout
211 * to a negative value.
213 * Revision 1.204 2008/11/06 19:42:17 fabiankeil
214 * Fix last-chunk detection hack to also apply
215 * if buf[] contains nothing but the last-chunk.
217 * Revision 1.203 2008/11/06 18:34:35 fabiankeil
218 * Factor receive_client_request() and
219 * parse_client_request() out of chat().
221 * Revision 1.202 2008/11/02 18:40:34 fabiankeil
222 * If we received a different amount of data than we expected,
223 * log a warning and make sure the server socket isn't reused.
225 * Revision 1.201 2008/11/02 16:48:20 fabiankeil
226 * Revert revision 1.195 and try again.
228 * Revision 1.200 2008/10/26 16:53:18 fabiankeil
231 * Revision 1.199 2008/10/26 15:36:10 fabiankeil
232 * Remove two debug messages with LOG_LEVEL_INFO.
234 * Revision 1.198 2008/10/22 15:19:55 fabiankeil
235 * Once More, With Feeling: if there is no logfile
236 * because the user didn't specify one, we shouldn't
237 * call init_error_log() after receiving SIGHUP either.
239 * Revision 1.197 2008/10/20 17:02:40 fabiankeil
240 * If SIGHUP is received while we aren't running in daemon
241 * mode, calling init_error_log() would be a mistake.
243 * Revision 1.196 2008/10/16 09:16:41 fabiankeil
244 * - Fix two gcc44 conversion warnings.
245 * - Don't bother logging the last five bytes
248 * Revision 1.195 2008/10/13 16:04:37 fabiankeil
249 * Make sure we don't try to reuse tainted server sockets.
251 * Revision 1.194 2008/10/12 18:35:18 fabiankeil
252 * The last commit was a bit too ambitious, apparently the content
253 * length adjustment is only necessary if we aren't buffering.
255 * Revision 1.193 2008/10/12 15:57:35 fabiankeil
256 * Fix content length calculation if we read headers
257 * and the start of the body at once. Now that we have
258 * FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
260 * Revision 1.192 2008/10/11 18:19:14 fabiankeil
261 * Even more chat() cosmetics.
263 * Revision 1.191 2008/10/11 18:00:14 fabiankeil
264 * Reformat some comments in chat().
266 * Revision 1.190 2008/10/11 14:58:00 fabiankeil
267 * In case of chunk-encoded content, stop reading if
268 * the buffer looks like it ends with the last chunk.
270 * Revision 1.189 2008/10/11 09:53:00 fabiankeil
271 * Let server_response_is_complete() deal properly with
272 * content that is neither buffered nor read all at once.
274 * Revision 1.188 2008/10/09 18:21:41 fabiankeil
275 * Flush work-in-progress changes to keep outgoing connections
276 * alive where possible. Incomplete and mostly #ifdef'd out.
278 * Revision 1.187 2008/09/07 12:35:05 fabiankeil
279 * Add mutex lock support for _WIN32.
281 * Revision 1.186 2008/09/04 08:13:58 fabiankeil
282 * Prepare for critical sections on Windows by adding a
283 * layer of indirection before the pthread mutex functions.
285 * Revision 1.185 2008/08/30 12:03:07 fabiankeil
286 * Remove FEATURE_COOKIE_JAR.
288 * Revision 1.184 2008/08/22 15:34:45 fabiankeil
289 * - Silence LLVM/Clang complaint.
290 * - Make received_hup_signal static.
291 * - Hide definitions for basedir, pidfile and received_hup_signal
292 * from __EMX__ as they only seem to be used in case of #ifdef unix.
294 * Revision 1.183 2008/08/21 07:09:35 fabiankeil
295 * Accept Shoutcast responses again. Problem reported
296 * and fix suggested by Stefan in #2062860.
298 * Revision 1.182 2008/06/27 11:13:56 fabiankeil
299 * Fix possible NULL-pointer dereference reported
300 * by din_a4 in #2003937. Pointy hat to me.
302 * Revision 1.181 2008/05/21 15:47:15 fabiankeil
303 * Streamline sed()'s prototype and declare
304 * the header parse and add structures static.
306 * Revision 1.180 2008/05/21 15:26:32 fabiankeil
307 * - Mark csp as immutable for send_crunch_response().
308 * - Fix comment spelling.
310 * Revision 1.179 2008/05/20 20:13:32 fabiankeil
311 * Factor update_server_headers() out of sed(), ditch the
312 * first_run hack and make server_patterns_light static.
314 * Revision 1.178 2008/05/10 13:23:38 fabiankeil
315 * Don't provide get_header() with the whole client state
316 * structure when it only needs access to csp->iob.
318 * Revision 1.177 2008/05/10 11:51:12 fabiankeil
319 * Make the "read the rest of the headers" loop a bit more readable.
321 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
322 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
323 * - Remove useless comment.
325 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
326 * Fix comment grammar.
328 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
329 * Remove the pointless buffer in client_protocol_is_unsupported().
331 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
332 * Least-effort fix for bug #1821930 (reported by Lee):
333 * If the response doesn't look like HTTP,
334 * tell the client and log the problem.
336 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
337 * Don't pass the whole csp structure to flush_socket()
338 * when it only needs a file descriptor and a buffer.
340 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
341 * Remove kill-popups action.
343 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
344 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
346 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
347 * Remove the treat-forbidden-connects-like-blocks action. We now
348 * use the "blocked" page for forbidden CONNECT requests by default.
350 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
351 * Also use shiny new connect_port_is_forbidden() in jcc.c.
353 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
354 * Rename url_actions() to get_url_actions() and let it
355 * use the standard parameter ordering.
357 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
358 * Let forward_url() use the standard parameter ordering
359 * and mark its second parameter immutable.
361 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
362 * Remove the "Listening ... for local connections only" log message.
363 * Whether or not remote connections are able to reach Privoxy is up
364 * to the operating system.
366 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
367 * Prevent the log messages for CONNECT requests to unacceptable
368 * ports from printing the limit-connect argument as [null] if
369 * limit-connect hasn't been explicitly enabled.
371 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
372 * Make sure all console-mode apps get a usage() instance
374 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
375 * Reword NO_SERVER_DATA_RESPONSE to make it harder
376 * to misunderstand what the message is all about.
378 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
379 * Unbreak trustfile which previously didn't work without
380 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
382 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
383 * Plug memory leak. Spotted by Valgrind, triggered by
384 * Privoxy-Regression-Test feeding proxyfuzz.py.
386 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
387 * In the HTTP snipplets, refer to the client as client.
389 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
390 * Emit a log message when activating the MS IIS5 hack.
392 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
393 * Log the "weak randomization factor" warning only
394 * once for mingw32 and provide some more details.
396 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
397 * Initialize log module after initializing mutexes, future
398 * deadlocks in that code should now work cross-platform.
400 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
401 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
402 * Reported by Bert van Leeuwen in BR#1818808.
404 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
405 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
407 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
408 * When in daemon mode, close stderr after the configuration file has been
409 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
411 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
412 * - Fix a crash when parsing invalid requests whose first header
413 * is rejected by get_header(). Regression (re?)introduced
414 * in r1.143 by yours truly.
415 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
416 * client_cookie_adder() to make sure send-vanilla-wafer can be
417 * controlled through tags (and thus regression-tested).
419 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
420 * - Move get_filter_function() from jcc.c to filters.c
421 * so the filter functions can be static.
422 * - Don't bother filtering body-less responses.
424 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
425 * Execute content filters through execute_content_filter().
427 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
428 * Initialize req to NULL to make sure it's defined if the
429 * first read_socket() call fails. Reported by icmp30.
431 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
432 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
433 * extensive comments moved to user manual.
435 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
436 * Don't crash if a broken header filter wiped out the request line.
438 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
439 * Fix byte_count calculation in case of flushes
440 * and don't parse the server headers a second time.
442 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
443 * - If there's a connection problem after we already forwarded
444 * parts of the original content, just hang up. Fixes BR#1776724.
445 * - Fix warnings about unused code on mingw32.
446 * - In case of flushes, calculate the byte count
447 * less incorrectly (I think).
449 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
450 * Add some more prototypes for static functions.
452 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
453 * Comment out request_contains_null_bytes() until it's used again.
455 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
456 * #1763173 from Stefan Huehner: s@const static@static const@
457 * and declare some more functions static.
459 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
460 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
461 * and explain why they were rejected in the first place.
462 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
463 * CONNECT requests. The request line was missing.
464 * - Add two more XXX reminders as we don't have enough already.
466 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
467 * As Hal noticed, checking dispatch_cgi() as the last cruncher
468 * looks like a bug if CGI requests are blocked unintentionally,
469 * so don't do it unless the user enabled the new config option
470 * "allow-cgi-request-crunching".
472 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
473 * - Allow to rewrite the request destination behind the client's back.
474 * - Turn the weird-looking unconditional for loop that
475 * reads the client request into a conditional while loop.
476 * Move the stuff that only runs once out of the loop.
477 * - Move parts of chat(), server_content_type() and the
478 * necessary stuff to fix BR#1750917 into get_filter_function().
480 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
481 * Temporary workaround for BR#1730105.
483 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
484 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
485 * deadlocks and crashes on OpenBSD and possibly other OS with neither
486 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
487 * Thanks to Ralf Horstmann for report and solution.
489 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
490 * Add forward-override{} to change the forwarding settings through
491 * action sections. This is mainly interesting to forward different
492 * clients differently (for example based on User-Agent or request
495 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
496 * - Let usage() mention the --chroot parameter.
497 * - Use read_socket() consistently and always leave
498 * the last buffer byte alone, even in cases where
499 * null termination (currently) doesn't matter.
501 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
502 * - Fix config file loading on Unix if no config file is specified.
503 * Since r1.97 Privoxy would always interpret the last argument as
504 * config file, even if it's a valid command line option.
505 * - Abort in case of unrecognized command line options. Closes #1719696.
506 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
507 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
509 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
510 * - Don't rerun crunchers that only depend on the request URL.
511 * - Don't count redirects and CGI requests as "blocked requests".
513 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
514 * Support crunching based on tags created by server-header taggers.
516 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
517 * Make HTTP snippets static (again). Add a Content-Type for those
518 * with content so the browser doesn't guess it based on the URL.
520 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
521 * Move crunching and request line rebuilding out of chat().
523 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
524 * Introduce tags as alternative way to specify which
525 * actions apply to a request. At the moment tags can be
526 * created based on client and server headers.
528 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
529 * Don't CLF-log CONNECT requests twice.
531 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
532 * Log the source address for ACL-related connection drops.
534 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
535 * New config option: enforce-blocks.
537 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
538 * - Move null byte check into separate function.
539 * - Don't confuse the client with error pages
540 * if a CONNECT request was already confirmed.
542 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
543 * Speed up NULL byte escaping and only log the complete
544 * NULL byte requests with header debugging enabled.
546 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
547 * Answer requests that contain NULL bytes with
548 * a custom response instead of waiting for more
549 * data until the client eventually hangs up.
551 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
552 * - Move delivery and logging of crunched responses
553 * from chat() into send_crunch_response().
554 * - Display the reason for generating http_responses.
555 * - Log the content length for LOG_LEVEL_CLF correctly
556 * (still incorrect for some fixed responses).
557 * - Reword an incorrect comment about
558 * treat-forbidden-connects-like-blocks violating
560 * - Add some log messages.
562 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
563 * Move mutex initialization into separate
564 * function and exit in case of errors.
566 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
567 * - Start to reduce chat()'s line count and move
568 * parts of it into separate functions.
569 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
571 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
572 * - Add Proxy-Agent header to HTTP snippets that are
573 * supposed to reach HTTP clients only.
574 * - Made a few CONNECT log messages more descriptive.
575 * - Catch completely empty server responses (as seen
576 * with Tor's fake ".noconnect" top level domain).
577 * - Use shiny new "forwarding-failed" template for socks errors.
579 * Revision 1.118 2007/01/07 07:43:43 joergs
580 * AmigaOS4 support added.
582 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
583 * Added config option accept-intercepted-requests
584 * and disabled it by default.
586 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
587 * Reverted parts of my last commit
588 * to keep error handling working.
590 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
591 * Fixed gcc43 conversion warnings.
593 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
594 * Fix -pedantic ISO C warning about converting
595 * from function pointer to object pointer.
597 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
598 * Silence compiler warning I introduced with my last commit.
600 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
601 * Mutex protect rand() if POSIX threading
602 * is used, warn the user if that's not possible
603 * and stop using it on _WIN32 where it could
606 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
607 * Don't prevent core dumps by catching SIGABRT.
608 * It's rude and makes debugging unreasonable painful.
610 * Revision 1.110 2006/12/13 14:52:53 etresoft
611 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
613 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
614 * Privoxy is now able to run as intercepting
615 * proxy in combination with any packet filter
616 * that does the port redirection. The destination
617 * is extracted from the "Host:" header which
618 * should be available for nearly all requests.
620 * Moved HTTP snipplets into jcc.c.
621 * Added error message for gopher proxy requests.
623 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
624 * Only unlink the pidfile if it's actually used.
626 * Change order of interception checks to make
627 * it possible to block or redirect requests for
630 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
631 * Make pthread mutex locking more generic. Instead of
632 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
633 * and use mutex locking unless there is an _r function
634 * available. Better safe than sorry.
636 * Fixes "./configure --disable-pthread" and should result
637 * in less threading-related problems on pthread-using platforms,
638 * but it still doesn't fix BR#1122404.
640 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
641 * Move pthread.h inclusion from jcc.c to jcc.h.
642 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
644 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
645 * Don't exit after receiving the second SIGHUP on Solaris.
647 * Fixes BR 1052235, but the same problem may exist on other
648 * systems. Once 3.0.6 is out we should use sigset()
649 * where available and see if it breaks anything.
651 * Revision 1.104 2006/09/23 13:26:38 roro
652 * Replace TABs by spaces in source code.
654 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
655 * Fix +redirect{}. Didn't work with -fast-redirects.
657 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
658 * Respond with 400 and a short text message
659 * if the client tries to use Privoxy as FTP proxy.
661 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
662 * Make number of retries in case of forwarded-connect problems
663 * a config file option (forwarded-connect-retries) and use 0 as
666 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
667 * Set random(3) seed.
669 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
670 * Follow the OpenBSD port's lead and protect the resolve
671 * functions on OpenBSD as well.
673 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
674 * --user fix. Only use the user as group if no group is specified.
675 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
677 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
678 * Windows service (re-)integration
682 * --install[:service_name]
683 * --uninstall[:service_name]
686 * They work as follows:
687 * --install will create a service for you and then terminate.
688 * By default the service name will be "privoxy" (without the quotes).
689 * However you can run multiple services if you wish, just by adding
690 * a colon and then a name (no spaces).
692 * --uninstall follows the exact same rules a --install.
694 * --service is used when the program is executed by the service
695 * control manager, and in normal circumstances would never be
696 * used as a command line argument.
698 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
699 * Windows service integration
701 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
702 * Incorporate Fabian Keil's patch work:
703 http://www.fabiankeil.de/sourcecode/privoxy/
705 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
706 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
707 * with what was really the latest development (the v_3_0_branch branch)
709 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
710 * Thanks to Jindrich Makovicka for a race condition fix for the log
711 * file. The race condition remains for non-pthread implementations.
712 * Reference patch #1175720.
714 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
715 * Add the ability to check jpeg images for invalid
716 * lengths of comment blocks. Defensive strategy
717 * against the exploit:
718 * Microsoft Security Bulletin MS04-028
719 * Buffer Overrun in JPEG Processing (GDI+) Could
720 * Allow Code Execution (833987)
721 * Enabled with +inspect-jpegs in actions files.
723 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
724 * - Fixed usage info for non-unix platforms
725 * - Fixed small cmdline parsing bug
727 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
728 * Diagnostics: Now preserve the returncode of pthread_create
729 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
731 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
732 * No longer ignore SIGCHLD. Fixes bug #769381
734 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
735 * Close jarfile on graceful exit, remove stray line
737 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
738 * Cosmetics: Killed a warning, a typo and an allocation left at exit
740 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
741 * No longer rely on non-POSIX.1 extensions of getcwd().
744 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
745 * Replaced setenv() by posix-compliant putenv()
746 * Thanks to Neil McCalden (nmcc AT users.sf.net).
748 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
749 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
751 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
752 * Clean-up and extension of improvements for forked mode:
753 * - Child's return code now consists of flags RC_FLAG_*
754 * - Reporting toggle to parent now properly #ifdef'ed
755 * - Children now report blocking to parent. This enables
756 * statistics in forked mode
758 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
759 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
760 * Children now report having been toggled through _exit(17), parents
761 * watch for that code and toggle themselves if found.
763 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
764 * Wrapping all *_r functions (the non-_r versions of them) with
765 * mutex semaphores for OSX. Hopefully this will take care of all
766 * of those pesky crash reports.
768 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
769 * Fixed two mostly harmless mem leaks
771 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
772 * Fix: Head of global clients list now initialized to NULL
774 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
775 * Added basic support for OPTIONS and TRACE HTTP methods:
776 * - New interceptor direct_response() added in chat().
777 * - sed() moved to earlier in the process, so that the
778 * Host: header is evaluated before actions and forwarding
781 * Revision 1.92 2002/05/08 16:00:46 oes
782 * Chat's buffer handling:
783 * - Fixed bug with unchecked out-of-mem conditions
784 * while reading client request & server headers
785 * - No longer predict if the buffer limit will be exceeded
786 * in the next read -- check add_to_iob's new
787 * return code. If buffer couldn't be extended
788 * (policy or out-of-mem) while
789 * - reading from client: abort
790 * - reading server headers: send error page
791 * - buffering server body for filter: flush,
792 * and if that fails: send error page
794 * Revision 1.91 2002/04/08 20:35:58 swa
797 * Revision 1.90 2002/04/02 14:57:28 oes
798 * Made sending wafers independent of FEATURE_COOKIE_JAR
800 * Revision 1.89 2002/03/31 17:18:59 jongfoster
801 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
803 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
804 * More compiler warning message maintenance
806 * Revision 1.87 2002/03/26 22:29:54 swa
807 * we have a new homepage!
809 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
810 * Workaround for closing the jarfile before load_config() comes around again
812 * Revision 1.85 2002/03/24 15:23:33 jongfoster
815 * Revision 1.84 2002/03/24 13:25:43 swa
816 * name change related issues
818 * Revision 1.83 2002/03/16 23:54:06 jongfoster
819 * Adding graceful termination feature, to help look for memory leaks.
820 * If you enable this (which, by design, has to be done by hand
821 * editing config.h) and then go to http://i.j.b/die, then the program
822 * will exit cleanly after the *next* request. It should free all the
823 * memory that was used.
825 * Revision 1.82 2002/03/13 00:27:05 jongfoster
828 * Revision 1.81 2002/03/12 01:42:50 oes
829 * Introduced modular filters
831 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
832 * OS/2 port maintenance:
833 * - Fixed EMX build - it had decayed a little
834 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
835 * substituted a memset for now.
837 * Revision 1.79 2002/03/09 20:03:52 jongfoster
838 * - Making various functions return int rather than size_t.
839 * (Undoing a recent change). Since size_t is unsigned on
840 * Windows, functions like read_socket that return -1 on
841 * error cannot return a size_t.
843 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
844 * crashes, and also frequently caused JB to jump to 100%
845 * CPU and stay there. (Because it thought it had just
846 * read ((unsigned)-1) == 4Gb of data...)
848 * - The signature of write_socket has changed, it now simply
849 * returns success=0/failure=nonzero.
851 * - Trying to get rid of a few warnings --with-debug on
852 * Windows, I've introduced a new type "jb_socket". This is
853 * used for the socket file descriptors. On Windows, this
854 * is SOCKET (a typedef for unsigned). Everywhere else, it's
855 * an int. The error value can't be -1 any more, so it's
856 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
857 * Windows it maps to the #define INVALID_SOCKET.)
859 * - The signature of bind_port has changed.
861 * Revision 1.78 2002/03/08 21:35:04 oes
862 * Added optional group supplement to --user option. Will now use default group of user if no group given
864 * Revision 1.77 2002/03/07 03:52:06 oes
865 * - Fixed compiler warnings etc
866 * - Improved handling of failed DNS lookups
868 * Revision 1.76 2002/03/06 22:54:35 jongfoster
869 * Automated function-comment nitpicking.
871 * Revision 1.75 2002/03/06 10:02:19 oes
872 * Fixed stupid bug when --user was not given
874 * Revision 1.74 2002/03/06 00:49:31 jongfoster
875 * Fixing warning on Windows
876 * Making #ifdefs that refer to the same variable consistently
877 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
879 * Revision 1.73 2002/03/05 23:57:30 hal9
880 * Stray character 's' on line 1618 was breaking build.
882 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
883 * - Re-enable OS/2 building after new parms were added
884 * - Fix false out of memory report when resolving CGI templates when no IP
885 * address is available of failed attempt (a la no such domain)
887 * Revision 1.71 2002/03/05 18:13:56 oes
888 * Added --user option
890 * Revision 1.70 2002/03/05 04:52:42 oes
891 * Deleted non-errlog debugging code
893 * Revision 1.69 2002/03/04 23:50:00 jongfoster
894 * Splitting off bind_port() call into bind_port_helper(), with
897 * Revision 1.68 2002/03/04 20:17:32 oes
900 * Revision 1.67 2002/03/04 18:18:57 oes
901 * - Removed _DEBUG mode
902 * - Cleand up cmdline parsing
903 * - Introduced --no-daemon, --pidfile options
904 * - Cleaned up signal handling:
905 * - Terminate cleanly on INT, TERM and ABRT
906 * - Schedule logfile for re-opening on HUP
907 * - Ignore CHLD and PIPE
908 * - Leave the rest with their default handlers
909 * - Uniform handler registration
910 * - Added usage() function
911 * - Played styleguide police
913 * Revision 1.66 2002/03/03 15:06:55 oes
914 * Re-enabled automatic config reloading
916 * Revision 1.65 2002/03/03 14:49:11 oes
917 * Fixed CLF logging: Now uses client's original HTTP request
919 * Revision 1.64 2002/03/03 09:18:03 joergs
920 * Made jumbjuster work on AmigaOS again.
922 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
923 * Clean up a little CRLF unpleasantness that suddenly appeared
925 * Revision 1.62 2002/02/20 23:17:23 jongfoster
926 * Detecting some out-of memory conditions and exiting with a log message.
928 * Revision 1.61 2002/01/17 21:01:52 jongfoster
929 * Moving all our URL and URL pattern parsing code to urlmatch.c.
931 * Revision 1.60 2001/12/30 14:07:32 steudten
932 * - Add signal handling (unix)
933 * - Add SIGHUP handler (unix)
934 * - Add creation of pidfile (unix)
935 * - Add action 'top' in rc file (RH)
936 * - Add entry 'SIGNALS' to manpage
937 * - Add exit message to logfile (unix)
939 * Revision 1.59 2001/12/13 14:07:18 oes
940 * Fixed Bug: 503 error page now sent OK
942 * Revision 1.58 2001/11/30 23:37:24 jongfoster
943 * Renaming the Win32 config file to config.txt - this is almost the
944 * same as the corresponding UNIX name "config"
946 * Revision 1.57 2001/11/16 00:47:43 jongfoster
947 * Changing the tty-disconnection code to use setsid().
949 * Revision 1.56 2001/11/13 20:20:54 jongfoster
950 * Tabs->spaces, fixing a bug with missing {} around an if()
952 * Revision 1.55 2001/11/13 20:14:53 jongfoster
953 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
955 * Revision 1.54 2001/11/07 00:03:14 steudten
956 * Give reliable return value if an error
957 * occurs not just 0 with new daemon mode.
959 * Revision 1.53 2001/11/05 21:41:43 steudten
960 * Add changes to be a real daemon just for unix os.
961 * (change cwd to /, detach from controlling tty, set
962 * process group and session leader to the own process.
964 * Add some fatal-error log message for failed malloc().
965 * Add '-d' if compiled with 'configure --with-debug' to
966 * enable debug output.
968 * Revision 1.52 2001/10/26 20:11:20 jongfoster
969 * Fixing type mismatch
971 * Revision 1.51 2001/10/26 17:38:28 oes
974 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
975 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
976 * threads to call select() simultaneously. So, it's time to do a real, live,
977 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
978 * (native). Both versions will work, but using __OS2__ offers multi-threading.
980 * Revision 1.49 2001/10/23 21:41:35 jongfoster
981 * Added call to initialize the (statically-allocated of course)
982 * "out of memory" CGI response.
984 * Revision 1.48 2001/10/10 19:56:46 jongfoster
985 * Moving some code that wasn't cookie-related out of an #ifdef
988 * Revision 1.47 2001/10/10 16:44:36 oes
989 * Added CONNECT destination port limitation check
991 * Revision 1.46 2001/10/08 15:17:41 oes
992 * Re-enabled SSL forwarding
994 * Revision 1.45 2001/10/07 15:42:11 oes
995 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
997 * Moved downgrading of the HTTP version from parse_http_request to
998 * chat(), since we can't decide if it is necessary before we have
999 * determined the actions for the URL. The HTTP command is now
1000 * *always* re-built so the repairs need no longer be special-cased.
1002 * filter_popups now gets a csp pointer so it can raise the new
1003 * CSP_FLAG_MODIFIED flag.
1007 * Added configurable size limit for the IOB. If the IOB grows so
1008 * large that the next read would exceed the limit, the header
1009 * is generated, and the header & unfiltered buffer are flushed
1010 * to the client. Chat then continues in non-buffering,
1011 * non-filtering body mode.
1013 * Revision 1.44 2001/10/02 18:13:57 oes
1016 * Revision 1.43 2001/10/02 15:32:13 oes
1017 * Moved generation of hdr
1019 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
1020 * Cleaning up 2 compiler warnings on OS/2.
1022 * Revision 1.41 2001/09/16 17:05:14 jongfoster
1023 * Removing unused #include showarg.h
1025 * Revision 1.40 2001/09/16 15:41:45 jongfoster
1026 * Fixing signed/unsigned comparison warning.
1028 * Revision 1.39 2001/09/16 13:21:27 jongfoster
1029 * Changes to use new list functions.
1031 * Revision 1.38 2001/09/16 13:01:46 jongfoster
1032 * Removing redundant function call that zeroed zalloc()'d memory.
1034 * Revision 1.37 2001/09/10 11:12:24 oes
1035 * Deleted unused variable
1037 * Revision 1.36 2001/09/10 10:56:15 oes
1038 * Silenced compiler warnings
1040 * Revision 1.35 2001/07/31 14:44:22 oes
1041 * Deleted unused size parameter from filter_popups()
1043 * Revision 1.34 2001/07/30 22:08:36 jongfoster
1044 * Tidying up #defines:
1045 * - All feature #defines are now of the form FEATURE_xxx
1046 * - Permanently turned off WIN_GUI_EDIT
1047 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
1049 * Revision 1.33 2001/07/29 19:32:00 jongfoster
1050 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
1052 * Revision 1.32 2001/07/29 18:47:05 jongfoster
1053 * Adding missing #include "loadcfg.h"
1055 * Revision 1.31 2001/07/29 12:17:48 oes
1056 * Applied pthread fix by Paul Lieverse
1058 * Revision 1.30 2001/07/25 22:57:13 jongfoster
1059 * __BEOS__ no longer overrides FEATURE_PTHREAD.
1060 * This is because FEATURE_PTHREAD will soon be widely used, so I
1061 * want to keep it simple.
1063 * Revision 1.29 2001/07/24 12:47:06 oes
1064 * Applied BeOS support update by Eugenia
1066 * Revision 1.28 2001/07/23 13:26:12 oes
1067 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
1069 * Revision 1.27 2001/07/19 19:09:47 haroon
1070 * - Added code to take care of the situation where while processing the first
1071 * server response (which includes the server header), after finding the end
1072 * of the headers we were not looking past the end of the headers for
1073 * content modification. I enabled it for filter_popups.
1074 * Someone else should look to see if other similar operations should be
1075 * done to the discarded portion of the buffer.
1077 * Note 2001/07/20: No, the other content modification mechanisms will process
1078 * the whole iob later anyway. --oes
1080 * Revision 1.26 2001/07/18 12:31:36 oes
1083 * Revision 1.25 2001/07/15 19:43:49 jongfoster
1084 * Supports POSIX threads.
1085 * Also removed some unused #includes.
1087 * Revision 1.24 2001/07/13 14:00:40 oes
1088 * - Generic content modification scheme:
1089 * Each feature has its own applicability flag that is set
1090 * from csp->action->flags.
1091 * Replaced the "filtering" int flag , by a function pointer
1092 * "content_filter" to the function that will do the content
1093 * modification. If it is != NULL, the document will be buffered
1094 * and processed through *content_filter, which must set
1095 * csp->content_length and return a modified copy of the body
1096 * or return NULL (on failiure).
1097 * - Changed csp->is_text to the more generic bitmap csp->content_type
1098 * which can currently take the valued CT_TEXT or CT_GIF
1099 * - Reformatting etc
1100 * - Removed all #ifdef PCRS
1102 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
1103 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
1104 * the `block_acl' call. This prevents a compilation error when the user
1105 * does not wish to use the "ACL" feature.
1107 * Revision 1.22 2001/06/29 21:45:41 oes
1108 * Indentation, CRLF->LF, Tab-> Space
1110 * Revision 1.21 2001/06/29 13:29:36 oes
1111 * - Cleaned up, improved comments
1112 * - Unified all possible interceptors (CGI,
1113 * block, trust, fast_redirect) in one
1114 * place, with one (CGI) answer generation
1115 * mechansim. Much clearer now.
1116 * - Removed the GIF image generation, which
1117 * is now done in filters.c:block_url()
1118 * - Made error conditions like domain lookup
1119 * failiure or (various) problems while talking
1120 * to the server use cgi.c:error_response()
1121 * instead of generating HTML/HTTP in chat() (yuck!)
1122 * - Removed logentry from cancelled commit
1124 * Revision 1.20 2001/06/09 10:55:28 jongfoster
1125 * Changing BUFSIZ ==> BUFFER_SIZE
1127 * Revision 1.19 2001/06/07 23:12:52 jongfoster
1128 * Replacing function pointer in struct gateway with a directly
1129 * called function forwarded_connect().
1130 * Replacing struct gateway with struct forward_spec
1132 * Revision 1.18 2001/06/03 19:12:16 oes
1133 * introduced new cgi handling
1135 * Revision 1.17 2001/06/01 20:07:23 jongfoster
1136 * Now uses action +image-blocker{} rather than config->tinygif
1138 * Revision 1.16 2001/06/01 18:49:17 jongfoster
1139 * Replaced "list_share" with "list" - the tiny memory gain was not
1140 * worth the extra complexity.
1142 * Revision 1.15 2001/05/31 21:24:47 jongfoster
1143 * Changed "permission" to "action" throughout.
1144 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
1145 * Moved vanilla wafer check into chat(), since we must now
1146 * decide whether or not to add it based on the URL.
1148 * Revision 1.14 2001/05/29 20:14:01 joergs
1149 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
1152 * Revision 1.13 2001/05/29 09:50:24 jongfoster
1153 * Unified blocklist/imagelist/permissionslist.
1154 * File format is still under discussion, but the internal changes
1155 * are (mostly) done.
1157 * Also modified interceptor behaviour:
1158 * - We now intercept all URLs beginning with one of the following
1159 * prefixes (and *only* these prefixes):
1161 * * http://ijbswa.sf.net/config/
1162 * * http://ijbswa.sourceforge.net/config/
1163 * - New interceptors "home page" - go to http://i.j.b/ to see it.
1164 * - Internal changes so that intercepted and fast redirect pages
1165 * are not replaced with an image.
1166 * - Interceptors now have the option to send a binary page direct
1167 * to the client. (i.e. ijb-send-banner uses this)
1168 * - Implemented show-url-info interceptor. (Which is why I needed
1169 * the above interceptors changes - a typical URL is
1170 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
1171 * The previous mechanism would not have intercepted that, and
1172 * if it had been intercepted then it then it would have replaced
1173 * it with an image.)
1175 * Revision 1.12 2001/05/27 22:17:04 oes
1177 * - re_process_buffer no longer writes the modified buffer
1178 * to the client, which was very ugly. It now returns the
1179 * buffer, which it is then written by chat.
1181 * - content_length now adjusts the Content-Length: header
1182 * for modified documents rather than crunch()ing it.
1183 * (Length info in csp->content_length, which is 0 for
1184 * unmodified documents)
1186 * - For this to work, sed() is called twice when filtering.
1188 * Revision 1.11 2001/05/26 17:27:53 jongfoster
1189 * Added support for CLF and fixed LOG_LEVEL_LOG.
1190 * Also did CRLF->LF fix of my previous patch.
1192 * Revision 1.10 2001/05/26 15:26:15 jongfoster
1193 * ACL feature now provides more security by immediately dropping
1194 * connections from untrusted hosts.
1196 * Revision 1.9 2001/05/26 00:28:36 jongfoster
1197 * Automatic reloading of config file.
1198 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
1199 * Most of the global variables have been moved to a new
1200 * struct configuration_spec, accessed through csp->config->globalname
1201 * Most of the globals remaining are used by the Win32 GUI.
1203 * Revision 1.8 2001/05/25 22:43:18 jongfoster
1204 * Fixing minor memory leak and buffer overflow.
1206 * Revision 1.7 2001/05/25 22:34:30 jongfoster
1209 * Revision 1.6 2001/05/23 00:13:58 joergs
1210 * AmigaOS support fixed.
1212 * Revision 1.5 2001/05/22 18:46:04 oes
1214 * - Enabled filtering banners by size rather than URL
1215 * by adding patterns that replace all standard banner
1216 * sizes with the "Junkbuster" gif to the re_filterfile
1218 * - Enabled filtering WebBugs by providing a pattern
1219 * which kills all 1x1 images
1221 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
1222 * which is selected by the (nonstandard and therefore
1223 * capital) letter 'U' in the option string.
1224 * It causes the quantifiers to be ungreedy by default.
1225 * Appending a ? turns back to greedy (!).
1227 * - Added a new interceptor ijb-send-banner, which
1228 * sends back the "Junkbuster" gif. Without imagelist or
1229 * MSIE detection support, or if tinygif = 1, or the
1230 * URL isn't recognized as an imageurl, a lame HTML
1231 * explanation is sent instead.
1233 * - Added new feature, which permits blocking remote
1234 * script redirects and firing back a local redirect
1236 * The feature is conditionally compiled, i.e. it
1237 * can be disabled with --disable-fast-redirects,
1238 * plus it must be activated by a "fast-redirects"
1239 * line in the config file, has its own log level
1240 * and of course wants to be displayed by show-proxy-args
1241 * Note: Boy, all the #ifdefs in 1001 locations and
1242 * all the fumbling with configure.in and acconfig.h
1243 * were *way* more work than the feature itself :-(
1245 * - Because a generic redirect template was needed for
1246 * this, tinygif = 3 now uses the same.
1248 * - Moved GIFs, and other static HTTP response templates
1251 * - Some minor fixes
1253 * - Removed some >400 CRs again (Jon, you really worked
1256 * Revision 1.4 2001/05/21 19:34:01 jongfoster
1257 * Made failure to bind() a fatal error.
1259 * Revision 1.3 2001/05/20 01:21:20 jongfoster
1260 * Version 2.9.4 checkin.
1261 * - Merged popupfile and cookiefile, and added control over PCRS
1262 * filtering, in new "permissionsfile".
1263 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
1264 * file error you now get a message box (in the Win32 GUI) rather
1265 * than the program exiting with no explanation.
1266 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
1268 * - Removed tabs from "config"
1269 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
1270 * - Bumped up version number.
1272 * Revision 1.2 2001/05/17 22:34:44 oes
1273 * - Added hint on GIF char array generation to jcc.c
1274 * - Cleaned CRLF's from the sources and related files
1275 * - Repaired logging for REF and FRC
1277 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
1278 * Initial import of version 2.9.3 source tree
1281 *********************************************************************/
1287 #include <sys/types.h>
1296 # ifndef FEATURE_PTHREAD
1300 # include <windows.h>
1301 # include <process.h>
1302 # endif /* ndef FEATURE_PTHREAD */
1305 # ifndef _WIN_CONSOLE
1306 # include "w32log.h"
1307 # endif /* ndef _WIN_CONSOLE */
1308 # include "w32svrapi.h"
1310 #else /* ifndef _WIN32 */
1312 # if !defined (__OS2__)
1313 # include <unistd.h>
1314 # include <sys/wait.h>
1315 # endif /* ndef __OS2__ */
1316 # include <sys/time.h>
1317 # include <sys/stat.h>
1318 # include <sys/ioctl.h>
1321 #include <sys/termios.h>
1329 # include <signal.h>
1332 # include <socket.h> /* BeOS has select() for sockets only. */
1333 # include <OS.h> /* declarations for threads and stuff. */
1336 # if defined(__EMX__) || defined(__OS2__)
1337 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1342 #define bzero(B,N) memset(B,0x00,n)
1346 # include <select.h>
1351 #include "project.h"
1354 #include "filters.h"
1355 #include "loaders.h"
1356 #include "parsers.h"
1357 #include "miscutil.h"
1359 #include "jbsockets.h"
1360 #include "gateway.h"
1361 #include "actions.h"
1363 #include "loadcfg.h"
1364 #include "urlmatch.h"
1366 const char jcc_h_rcs[] = JCC_H_VERSION;
1367 const char project_h_rcs[] = PROJECT_H_VERSION;
1370 struct client_state clients[1];
1371 struct file_list files[1];
1373 #ifdef FEATURE_STATISTICS
1374 int urls_read = 0; /* total nr of urls read inc rejected */
1375 int urls_rejected = 0; /* total nr of urls rejected */
1376 #endif /* def FEATURE_STATISTICS */
1378 #ifdef FEATURE_GRACEFUL_TERMINATION
1379 int g_terminate = 0;
1382 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1383 static void sig_handler(int the_signal);
1385 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1386 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1387 static jb_err get_server_headers(struct client_state *csp);
1388 static const char *crunch_reason(const struct http_response *rsp);
1389 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
1390 static char *get_request_line(struct client_state *csp);
1391 static jb_err receive_client_request(struct client_state *csp);
1392 static jb_err parse_client_request(struct client_state *csp);
1393 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1394 static jb_err change_request_destination(struct client_state *csp);
1395 static void chat(struct client_state *csp);
1396 static void serve(struct client_state *csp);
1397 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1398 static void usage(const char *myname);
1400 static void initialize_mutexes(void);
1401 static jb_socket bind_port_helper(struct configuration_spec *config);
1402 static void listen_loop(void);
1405 void serve(struct client_state *csp);
1406 #else /* ifndef AMIGA */
1407 static void serve(struct client_state *csp);
1408 #endif /* def AMIGA */
1411 static int32 server_thread(void *data);
1412 #endif /* def __BEOS__ */
1415 #define sleep(N) Sleep(((N) * 1000))
1419 #define sleep(N) DosSleep(((N) * 100))
1422 #ifdef MUTEX_LOCKS_AVAILABLE
1424 * XXX: Does the locking stuff really belong in this file?
1426 privoxy_mutex_t log_mutex;
1427 privoxy_mutex_t log_init_mutex;
1428 privoxy_mutex_t connection_reuse_mutex;
1430 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1431 privoxy_mutex_t resolver_mutex;
1432 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1434 #ifndef HAVE_GMTIME_R
1435 privoxy_mutex_t gmtime_mutex;
1436 #endif /* ndef HAVE_GMTIME_R */
1438 #ifndef HAVE_LOCALTIME_R
1439 privoxy_mutex_t localtime_mutex;
1440 #endif /* ndef HAVE_GMTIME_R */
1443 privoxy_mutex_t rand_mutex;
1444 #endif /* ndef HAVE_RANDOM */
1446 #endif /* def MUTEX_LOCKS_AVAILABLE */
1449 const char *basedir = NULL;
1450 const char *pidfile = NULL;
1451 static int received_hup_signal = 0;
1452 #endif /* defined unix */
1454 /* HTTP snipplets. */
1455 static const char CSUCCEED[] =
1456 "HTTP/1.0 200 Connection established\r\n"
1457 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1459 static const char CHEADER[] =
1460 "HTTP/1.0 400 Invalid header received from client\r\n"
1461 "Proxy-Agent: Privoxy " VERSION "\r\n"
1462 "Content-Type: text/plain\r\n"
1463 "Connection: close\r\n\r\n"
1464 "Invalid header received from client.\r\n";
1466 static const char FTP_RESPONSE[] =
1467 "HTTP/1.0 400 Invalid request received from client\r\n"
1468 "Content-Type: text/plain\r\n"
1469 "Connection: close\r\n\r\n"
1470 "Invalid request. Privoxy doesn't support FTP.\r\n";
1472 static const char GOPHER_RESPONSE[] =
1473 "HTTP/1.0 400 Invalid request received from client\r\n"
1474 "Content-Type: text/plain\r\n"
1475 "Connection: close\r\n\r\n"
1476 "Invalid request. Privoxy doesn't support gopher.\r\n";
1478 /* XXX: should be a template */
1479 static const char MISSING_DESTINATION_RESPONSE[] =
1480 "HTTP/1.0 400 Bad request received from client\r\n"
1481 "Proxy-Agent: Privoxy " VERSION "\r\n"
1482 "Content-Type: text/plain\r\n"
1483 "Connection: close\r\n\r\n"
1484 "Bad request. Privoxy was unable to extract the destination.\r\n";
1486 /* XXX: should be a template */
1487 static const char NO_SERVER_DATA_RESPONSE[] =
1488 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1489 "Proxy-Agent: Privoxy " VERSION "\r\n"
1490 "Content-Type: text/plain\r\n"
1491 "Connection: close\r\n\r\n"
1492 "Empty server or forwarder response.\r\n"
1493 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1495 /* XXX: should be a template */
1496 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1497 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1498 "Proxy-Agent: Privoxy " VERSION "\r\n"
1499 "Content-Type: text/plain\r\n"
1500 "Connection: close\r\n\r\n"
1501 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1504 /* XXX: should be a template */
1505 static const char NULL_BYTE_RESPONSE[] =
1506 "HTTP/1.0 400 Bad request received from client\r\n"
1507 "Proxy-Agent: Privoxy " VERSION "\r\n"
1508 "Content-Type: text/plain\r\n"
1509 "Connection: close\r\n\r\n"
1510 "Bad request. Null byte(s) before end of request.\r\n";
1513 /* XXX: should be a template */
1514 static const char MESSED_UP_REQUEST_RESPONSE[] =
1515 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1516 "Proxy-Agent: Privoxy " VERSION "\r\n"
1517 "Content-Type: text/plain\r\n"
1518 "Connection: close\r\n\r\n"
1519 "Bad request. Messed up with header filters.\r\n";
1521 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
1522 "HTTP/1.0 503 Too many open connections\r\n"
1523 "Proxy-Agent: Privoxy " VERSION "\r\n"
1524 "Content-Type: text/plain\r\n"
1525 "Connection: close\r\n\r\n"
1526 "Maximum number of open connections reached.\r\n";
1528 /* XXX: should be a template */
1529 static const char CONNECTION_TIMEOUT_RESPONSE[] =
1530 "HTTP/1.0 504 Connection timeout\r\n"
1531 "Proxy-Agent: Privoxy " VERSION "\r\n"
1532 "Content-Type: text/plain\r\n"
1533 "Connection: close\r\n\r\n"
1534 "The connection timed out.\r\n";
1536 /* A function to crunch a response */
1537 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1539 /* Crunch function flags */
1540 #define CF_NO_FLAGS 0
1541 /* Cruncher applies to forced requests as well */
1542 #define CF_IGNORE_FORCE 1
1543 /* Crunched requests are counted for the block statistics */
1544 #define CF_COUNT_AS_REJECT 2
1546 /* A crunch function and its flags */
1549 const crunch_func_ptr cruncher;
1553 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1555 /* Complete list of cruncher functions */
1556 static const struct cruncher crunchers_all[] = {
1557 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1558 { block_url, CF_COUNT_AS_REJECT },
1559 #ifdef FEATURE_TRUST
1560 { trust_url, CF_COUNT_AS_REJECT },
1561 #endif /* def FEATURE_TRUST */
1562 { redirect_url, CF_NO_FLAGS },
1563 { dispatch_cgi, CF_IGNORE_FORCE},
1567 /* Light version, used after tags are applied */
1568 static const struct cruncher crunchers_light[] = {
1569 { block_url, CF_COUNT_AS_REJECT },
1570 { redirect_url, CF_NO_FLAGS },
1576 * XXX: Don't we really mean
1582 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1583 /*********************************************************************
1585 * Function : sig_handler
1587 * Description : Signal handler for different signals.
1588 * Exit gracefully on TERM and INT
1589 * or set a flag that will cause the errlog
1590 * to be reopened by the main thread on HUP.
1593 * 1 : the_signal = the signal cause this function to call
1597 *********************************************************************/
1598 static void sig_handler(int the_signal)
1604 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1616 received_hup_signal = 1;
1622 * We shouldn't be here, unless we catch signals
1623 * in main() that we can't handle here!
1625 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1633 /*********************************************************************
1635 * Function : client_protocol_is_unsupported
1637 * Description : Checks if the client used a known unsupported
1638 * protocol and deals with it by sending an error
1642 * 1 : csp = Current client state (buffers, headers, etc...)
1643 * 2 : req = the first request line send by the client
1645 * Returns : TRUE if an error response has been generated, or
1646 * FALSE if the request doesn't look invalid.
1648 *********************************************************************/
1649 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1652 * If it's a FTP or gopher request, we don't support it.
1654 * These checks are better than nothing, but they might
1655 * not work in all configurations and some clients might
1656 * have problems digesting the answer.
1658 * They should, however, never cause more problems than
1659 * Privoxy's old behaviour (returning the misleading HTML
1662 * "Could not resolve http://(ftp|gopher)://example.org").
1664 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1666 const char *response = NULL;
1667 const char *protocol = NULL;
1669 if (!strncmpic(req, "GET ftp://", 10))
1671 response = FTP_RESPONSE;
1676 response = GOPHER_RESPONSE;
1677 protocol = "GOPHER";
1679 log_error(LOG_LEVEL_ERROR,
1680 "%s tried to use Privoxy as %s proxy: %s",
1681 csp->ip_addr_str, protocol, req);
1682 log_error(LOG_LEVEL_CLF,
1683 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1685 write_socket(csp->cfd, response, strlen(response));
1694 /*********************************************************************
1696 * Function : get_request_destination_elsewhere
1698 * Description : If the client's request was redirected into
1699 * Privoxy without the client's knowledge,
1700 * the request line lacks the destination host.
1702 * This function tries to get it elsewhere,
1703 * provided accept-intercepted-requests is enabled.
1705 * "Elsewhere" currently only means "Host: header",
1706 * but in the future we may ask the redirecting
1707 * packet filter to look the destination up.
1709 * If the destination stays unknown, an error
1710 * response is send to the client and headers
1711 * are freed so that chat() can return directly.
1714 * 1 : csp = Current client state (buffers, headers, etc...)
1715 * 2 : headers = a header list
1717 * Returns : JB_ERR_OK if the destination is now known, or
1718 * JB_ERR_PARSE if it isn't.
1720 *********************************************************************/
1721 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1725 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1727 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1728 " Privoxy isn't configured to accept intercepted requests.",
1729 csp->ip_addr_str, csp->http->cmd);
1730 /* XXX: Use correct size */
1731 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1732 csp->ip_addr_str, csp->http->cmd);
1734 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1735 destroy_list(headers);
1737 return JB_ERR_PARSE;
1739 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1741 /* Split the domain we just got for pattern matching */
1742 init_domain_components(csp->http);
1748 /* We can't work without destination. Go spread the news.*/
1750 req = list_to_text(headers);
1752 /* XXX: Use correct size */
1753 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1754 csp->ip_addr_str, csp->http->cmd);
1755 log_error(LOG_LEVEL_ERROR,
1756 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1757 csp->ip_addr_str, csp->http->cmd, req);
1760 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1761 destroy_list(headers);
1763 return JB_ERR_PARSE;
1766 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1767 * to get the destination IP address, use it as host directly
1768 * or do a reverse DNS lookup first.
1773 /*********************************************************************
1775 * Function : get_server_headers
1777 * Description : Parses server headers in iob and fills them
1778 * into csp->headers so that they can later be
1782 * 1 : csp = Current client state (buffers, headers, etc...)
1784 * Returns : JB_ERR_OK if everything went fine, or
1785 * JB_ERR_PARSE if the headers were incomplete.
1787 *********************************************************************/
1788 static jb_err get_server_headers(struct client_state *csp)
1790 int continue_hack_in_da_house = 0;
1793 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1798 * continue hack in da house. Ignore the ending of
1799 * this head and continue enlisting header lines.
1800 * The reason is described below.
1802 enlist(csp->headers, "");
1803 continue_hack_in_da_house = 0;
1806 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1809 * It's a bodyless continue response, don't
1810 * stop header parsing after reaching its end.
1812 * As a result Privoxy will concatenate the
1813 * next response's head and parse and deliver
1814 * the headers as if they belonged to one request.
1816 * The client will separate them because of the
1817 * empty line between them.
1819 * XXX: What we're doing here is clearly against
1820 * the intended purpose of the continue header,
1821 * and under some conditions (HTTP/1.0 client request)
1822 * it's a standard violation.
1824 * Anyway, "sort of against the spec" is preferable
1825 * to "always getting confused by Continue responses"
1826 * (Privoxy's behaviour before this hack was added)
1828 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1829 continue_hack_in_da_house = 1;
1831 else if (*header == '\0')
1834 * If the header is empty, but the Continue hack
1835 * isn't active, we can assume that we reached the
1836 * end of the buffer before we hit the end of the
1839 * Inform the caller an let it decide how to handle it.
1841 return JB_ERR_PARSE;
1844 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1847 * XXX: Should we quit the request and return a
1848 * out of memory error page instead?
1850 log_error(LOG_LEVEL_ERROR,
1851 "Out of memory while enlisting server headers. %s lost.",
1861 /*********************************************************************
1863 * Function : crunch_reason
1865 * Description : Translates the crunch reason code into a string.
1868 * 1 : rsp = a http_response
1870 * Returns : A string with the crunch reason or an error description.
1872 *********************************************************************/
1873 static const char *crunch_reason(const struct http_response *rsp)
1875 char * reason = NULL;
1877 assert(rsp != NULL);
1880 return "Internal error while searching for crunch reason";
1883 switch (rsp->reason)
1885 case RSP_REASON_UNSUPPORTED:
1886 reason = "Unsupported HTTP feature";
1888 case RSP_REASON_BLOCKED:
1891 case RSP_REASON_UNTRUSTED:
1892 reason = "Untrusted";
1894 case RSP_REASON_REDIRECTED:
1895 reason = "Redirected";
1897 case RSP_REASON_CGI_CALL:
1898 reason = "CGI Call";
1900 case RSP_REASON_NO_SUCH_DOMAIN:
1901 reason = "DNS failure";
1903 case RSP_REASON_FORWARDING_FAILED:
1904 reason = "Forwarding failed";
1906 case RSP_REASON_CONNECT_FAILED:
1907 reason = "Connection failure";
1909 case RSP_REASON_OUT_OF_MEMORY:
1910 reason = "Out of memory (may mask other reasons)";
1913 reason = "No reason recorded";
1921 /*********************************************************************
1923 * Function : send_crunch_response
1925 * Description : Delivers already prepared response for
1926 * intercepted requests, logs the interception
1927 * and frees the response.
1930 * 1 : csp = Current client state (buffers, headers, etc...)
1931 * 1 : rsp = Fully prepared response. Will be freed on exit.
1933 * Returns : Nothing.
1935 *********************************************************************/
1936 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
1938 const struct http_request *http = csp->http;
1939 char status_code[4];
1941 assert(rsp != NULL);
1942 assert(rsp->head != NULL);
1947 * Not supposed to happen. If it does
1948 * anyway, treat it as an unknown error.
1950 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1951 /* return code doesn't matter */
1956 /* If rsp is still NULL, we have serious internal problems. */
1957 log_error(LOG_LEVEL_FATAL,
1958 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1962 * Extract the status code from the actual head
1963 * that was send to the client. It is the only
1964 * way to get it right for all requests, including
1965 * the fixed ones for out-of-memory problems.
1967 * A head starts like this: 'HTTP/1.1 200...'
1971 status_code[0] = rsp->head[9];
1972 status_code[1] = rsp->head[10];
1973 status_code[2] = rsp->head[11];
1974 status_code[3] = '\0';
1976 /* Write the answer to the client */
1977 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1978 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1980 /* There is nothing we can do about it. */
1981 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1984 /* Log that the request was crunched and why. */
1985 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
1986 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
1987 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1989 /* Clean up and return */
1990 if (cgi_error_memory() != rsp)
1992 free_http_response(rsp);
1999 /*********************************************************************
2001 * Function : request_contains_null_bytes
2003 * Description : Checks for NULL bytes in the request and sends
2004 * an error message to the client if any were found.
2006 * XXX: currently not used, see comment in chat().
2009 * 1 : csp = Current client state (buffers, headers, etc...)
2010 * 2 : buf = Data from the client's request to check.
2011 * 3 : len = The data length.
2013 * Returns : TRUE if the request contained one or more NULL bytes, or
2016 *********************************************************************/
2017 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
2019 size_t c_len; /* Request lenght when treated as C string */
2021 c_len = strlen(buf);
2026 * Null byte(s) found. Log the request,
2027 * return an error response and hang up.
2029 size_t tmp_len = c_len;
2034 * Replace NULL byte(s) with '°' characters
2035 * so the request can be logged as string.
2036 * XXX: Is there a better replacement character?
2039 tmp_len += strlen(buf+tmp_len);
2040 } while (tmp_len < len);
2042 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
2043 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
2044 log_error(LOG_LEVEL_HEADER,
2045 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
2047 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
2049 /* XXX: Log correct size */
2050 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2060 /*********************************************************************
2062 * Function : crunch_response_triggered
2064 * Description : Checks if the request has to be crunched,
2065 * and delivers the crunch response if necessary.
2068 * 1 : csp = Current client state (buffers, headers, etc...)
2069 * 2 : crunchers = list of cruncher functions to run
2071 * Returns : TRUE if the request was answered with a crunch response
2074 *********************************************************************/
2075 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
2077 struct http_response *rsp = NULL;
2078 const struct cruncher *c;
2081 * If CGI request crunching is disabled,
2082 * check the CGI dispatcher out of order to
2083 * prevent unintentional blocks or redirects.
2085 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
2086 && (NULL != (rsp = dispatch_cgi(csp))))
2088 /* Deliver, log and free the interception response. */
2089 send_crunch_response(csp, rsp);
2093 for (c = crunchers; c->cruncher != NULL; c++)
2096 * Check the cruncher if either Privoxy is toggled
2097 * on and the request isn't forced, or if the cruncher
2098 * applies to forced requests as well.
2100 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
2101 !(csp->flags & CSP_FLAG_FORCED)) ||
2102 (c->flags & CF_IGNORE_FORCE))
2104 rsp = c->cruncher(csp);
2107 /* Deliver, log and free the interception response. */
2108 send_crunch_response(csp, rsp);
2109 #ifdef FEATURE_STATISTICS
2110 if (c->flags & CF_COUNT_AS_REJECT)
2112 csp->flags |= CSP_FLAG_REJECTED;
2114 #endif /* def FEATURE_STATISTICS */
2125 /*********************************************************************
2127 * Function : build_request_line
2129 * Description : Builds the HTTP request line.
2131 * If a HTTP forwarder is used it expects the whole URL,
2132 * web servers only get the path.
2135 * 1 : csp = Current client state (buffers, headers, etc...)
2136 * 2 : fwd = The forwarding spec used for the request
2137 * XXX: Should use http->fwd instead.
2138 * 3 : request_line = The old request line which will be replaced.
2140 * Returns : Nothing. Terminates in case of memory problems.
2142 *********************************************************************/
2143 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
2145 struct http_request *http = csp->http;
2147 assert(http->ssl == 0);
2150 * Downgrade http version from 1.1 to 1.0
2151 * if +downgrade action applies.
2153 if ( (csp->action->flags & ACTION_DOWNGRADE)
2154 && (!strcmpic(http->ver, "HTTP/1.1")))
2157 http->ver = strdup("HTTP/1.0");
2159 if (http->ver == NULL)
2161 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
2166 * Rebuild the request line.
2168 freez(*request_line);
2169 *request_line = strdup(http->gpc);
2170 string_append(request_line, " ");
2172 if (fwd->forward_host)
2174 string_append(request_line, http->url);
2178 string_append(request_line, http->path);
2180 string_append(request_line, " ");
2181 string_append(request_line, http->ver);
2183 if (*request_line == NULL)
2185 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
2187 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
2191 /*********************************************************************
2193 * Function : change_request_destination
2195 * Description : Parse a (rewritten) request line and regenerate
2196 * the http request data.
2199 * 1 : csp = Current client state (buffers, headers, etc...)
2201 * Returns : Forwards the parse_http_request() return code.
2202 * Terminates in case of memory problems.
2204 *********************************************************************/
2205 static jb_err change_request_destination(struct client_state *csp)
2207 struct http_request *http = csp->http;
2210 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
2211 free_http_request(http);
2212 err = parse_http_request(csp->headers->first->str, http);
2213 if (JB_ERR_OK != err)
2215 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2216 jb_err_to_string(err));
2220 /* XXX: ocmd is a misleading name */
2221 http->ocmd = strdup(http->cmd);
2222 if (http->ocmd == NULL)
2224 log_error(LOG_LEVEL_FATAL,
2225 "Out of memory copying rewritten HTTP request line");
2233 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2234 /*********************************************************************
2236 * Function : server_response_is_complete
2238 * Description : Determines whether we should stop reading
2239 * from the server socket.
2242 * 1 : csp = Current client state (buffers, headers, etc...)
2243 * 2 : content_length = Length of content received so far.
2245 * Returns : TRUE if the response is complete,
2248 *********************************************************************/
2249 static int server_response_is_complete(struct client_state *csp,
2250 unsigned long long content_length)
2252 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
2254 if (!strcmpic(csp->http->gpc, "HEAD"))
2257 * "HEAD" implies no body, we are thus expecting
2258 * no content. XXX: incomplete "list" of methods?
2260 csp->expected_content_length = 0;
2261 content_length_known = TRUE;
2264 if (csp->http->status == 304)
2267 * Expect no body. XXX: incomplete "list" of status codes?
2269 csp->expected_content_length = 0;
2270 content_length_known = TRUE;
2273 return (content_length_known && ((0 == csp->expected_content_length)
2274 || (csp->expected_content_length <= content_length)));
2278 /*********************************************************************
2280 * Function : wait_for_alive_connections
2282 * Description : Waits for alive connections to timeout.
2288 *********************************************************************/
2289 static void wait_for_alive_connections(void)
2291 int connections_alive = close_unusable_connections();
2293 while (0 < connections_alive)
2295 log_error(LOG_LEVEL_CONNECT,
2296 "Waiting for %d connections to timeout.",
2299 connections_alive = close_unusable_connections();
2302 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
2307 /*********************************************************************
2309 * Function : save_connection_destination
2311 * Description : Remembers a connection for reuse later on.
2314 * 1 : sfd = Open socket to remember.
2315 * 2 : http = The destination for the connection.
2316 * 3 : fwd = The forwarder settings used.
2317 * 3 : server_connection = storage.
2321 *********************************************************************/
2322 void save_connection_destination(jb_socket sfd,
2323 const struct http_request *http,
2324 const struct forward_spec *fwd,
2325 struct reusable_connection *server_connection)
2327 assert(sfd != JB_INVALID_SOCKET);
2328 assert(NULL != http->host);
2329 server_connection->host = strdup(http->host);
2330 if (NULL == server_connection->host)
2332 log_error(LOG_LEVEL_FATAL, "Out of memory saving socket.");
2334 server_connection->port = http->port;
2336 assert(NULL != fwd);
2337 assert(server_connection->gateway_host == NULL);
2338 assert(server_connection->gateway_port == 0);
2339 assert(server_connection->forwarder_type == 0);
2340 assert(server_connection->forward_host == NULL);
2341 assert(server_connection->forward_port == 0);
2343 server_connection->forwarder_type = fwd->type;
2344 if (NULL != fwd->gateway_host)
2346 server_connection->gateway_host = strdup(fwd->gateway_host);
2347 if (NULL == server_connection->gateway_host)
2349 log_error(LOG_LEVEL_FATAL, "Out of memory saving gateway_host.");
2354 server_connection->gateway_host = NULL;
2356 server_connection->gateway_port = fwd->gateway_port;
2358 if (NULL != fwd->forward_host)
2360 server_connection->forward_host = strdup(fwd->forward_host);
2361 if (NULL == server_connection->forward_host)
2363 log_error(LOG_LEVEL_FATAL, "Out of memory saving forward_host.");
2368 server_connection->forward_host = NULL;
2370 server_connection->forward_port = fwd->forward_port;
2372 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2375 /*********************************************************************
2377 * Function : mark_server_socket_tainted
2379 * Description : Makes sure we don't reuse a server socket
2380 * (if we didn't read everything the server sent
2381 * us reusing the socket would lead to garbage).
2384 * 1 : csp = Current client state (buffers, headers, etc...)
2388 *********************************************************************/
2389 static void mark_server_socket_tainted(struct client_state *csp)
2391 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
2393 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
2394 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
2398 /*********************************************************************
2400 * Function : get_request_line
2402 * Description : Read the client request line.
2405 * 1 : csp = Current client state (buffers, headers, etc...)
2407 * Returns : Pointer to request line or NULL in case of errors.
2409 *********************************************************************/
2410 static char *get_request_line(struct client_state *csp)
2412 char buf[BUFFER_SIZE];
2413 char *request_line = NULL;
2416 memset(buf, 0, sizeof(buf));
2420 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2422 log_error(LOG_LEVEL_ERROR,
2423 "Stopped waiting for the request line.");
2424 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2425 strlen(CONNECTION_TIMEOUT_RESPONSE));
2429 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2431 if (len <= 0) return NULL;
2434 * If there is no memory left for buffering the
2435 * request, there is nothing we can do but hang up
2437 if (add_to_iob(csp, buf, len))
2442 request_line = get_header(csp->iob);
2444 } while ((NULL != request_line) && ('\0' == *request_line));
2446 return request_line;
2451 /*********************************************************************
2453 * Function : receive_client_request
2455 * Description : Read the client's request (more precisely the
2456 * client headers) and answer it if necessary.
2458 * Note that since we're not using select() we could get
2459 * blocked here if a client connected, then didn't say
2463 * 1 : csp = Current client state (buffers, headers, etc...)
2465 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
2467 *********************************************************************/
2468 static jb_err receive_client_request(struct client_state *csp)
2470 char buf[BUFFER_SIZE];
2473 struct http_request *http;
2477 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
2478 struct list header_list;
2479 struct list *headers = &header_list;
2483 memset(buf, 0, sizeof(buf));
2485 req = get_request_line(csp);
2488 return JB_ERR_PARSE;
2490 assert(*req != '\0');
2492 if (client_protocol_is_unsupported(csp, req))
2494 return JB_ERR_PARSE;
2497 #ifdef FEATURE_FORCE_LOAD
2499 * If this request contains the FORCE_PREFIX and blocks
2500 * aren't enforced, get rid of it and set the force flag.
2502 if (strstr(req, FORCE_PREFIX))
2504 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2506 log_error(LOG_LEVEL_FORCE,
2507 "Ignored force prefix in request: \"%s\".", req);
2511 strclean(req, FORCE_PREFIX);
2512 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2513 csp->flags |= CSP_FLAG_FORCED;
2516 #endif /* def FEATURE_FORCE_LOAD */
2518 err = parse_http_request(req, http);
2520 if (JB_ERR_OK != err)
2522 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2523 /* XXX: Use correct size */
2524 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2525 log_error(LOG_LEVEL_ERROR,
2526 "Couldn't parse request line received from %s: %s",
2527 csp->ip_addr_str, jb_err_to_string(err));
2529 free_http_request(http);
2530 return JB_ERR_PARSE;
2533 /* grab the rest of the client's headers */
2537 p = get_header(csp->iob);
2541 /* There are no additional headers to read. */
2548 * We didn't receive a complete header
2549 * line yet, get the rest of it.
2551 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2553 log_error(LOG_LEVEL_ERROR,
2554 "Stopped grabbing the client headers.");
2555 return JB_ERR_PARSE;
2558 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2561 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2562 destroy_list(headers);
2563 return JB_ERR_PARSE;
2566 if (add_to_iob(csp, buf, len))
2569 * If there is no memory left for buffering the
2570 * request, there is nothing we can do but hang up
2572 destroy_list(headers);
2573 return JB_ERR_MEMORY;
2579 * We were able to read a complete
2580 * header and can finaly enlist it.
2587 if (http->host == NULL)
2590 * If we still don't know the request destination,
2591 * the request is invalid or the client uses
2592 * Privoxy without its knowledge.
2594 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2597 * Our attempts to get the request destination
2598 * elsewhere failed or Privoxy is configured
2599 * to only accept proxy requests.
2601 * An error response has already been send
2602 * and we're done here.
2604 return JB_ERR_PARSE;
2609 * Determine the actions for this URL
2611 #ifdef FEATURE_TOGGLE
2612 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2614 /* Most compatible set of actions (i.e. none) */
2615 init_current_action(csp->action);
2618 #endif /* ndef FEATURE_TOGGLE */
2620 get_url_actions(csp, http);
2624 * Save a copy of the original request for logging
2626 http->ocmd = strdup(http->cmd);
2627 if (http->ocmd == NULL)
2629 log_error(LOG_LEVEL_FATAL,
2630 "Out of memory copying HTTP request line");
2632 enlist(csp->headers, http->cmd);
2634 /* Append the previously read headers */
2635 list_append_list_unique(csp->headers, headers);
2636 destroy_list(headers);
2643 /*********************************************************************
2645 * Function : parse_client_request
2647 * Description : Parses the client's request and decides what to do
2650 * Note that since we're not using select() we could get
2651 * blocked here if a client connected, then didn't say
2655 * 1 : csp = Current client state (buffers, headers, etc...)
2657 * Returns : JB_ERR_OK or JB_ERR_PARSE
2659 *********************************************************************/
2660 static jb_err parse_client_request(struct client_state *csp)
2662 struct http_request *http = csp->http;
2665 err = sed(csp, FILTER_CLIENT_HEADERS);
2666 if (JB_ERR_OK != err)
2668 /* XXX: Should be handled in sed(). */
2669 assert(err == JB_ERR_PARSE);
2670 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
2672 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2674 /* Check request line for rewrites. */
2675 if ((NULL == csp->headers->first->str)
2676 || (strcmp(http->cmd, csp->headers->first->str) &&
2677 (JB_ERR_OK != change_request_destination(csp))))
2680 * A header filter broke the request line - bail out.
2682 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2683 /* XXX: Use correct size */
2684 log_error(LOG_LEVEL_CLF,
2685 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2686 log_error(LOG_LEVEL_ERROR,
2687 "Invalid request line after applying header filters.");
2688 free_http_request(http);
2690 return JB_ERR_PARSE;
2698 /*********************************************************************
2702 * Description : Once a connection to the client has been accepted,
2703 * this function is called (via serve()) to handle the
2704 * main business of the communication. When this
2705 * function returns, the caller must close the client
2708 * FIXME: chat is nearly thousand lines long.
2712 * 1 : csp = Current client state (buffers, headers, etc...)
2714 * Returns : Nothing.
2716 *********************************************************************/
2717 static void chat(struct client_state *csp)
2719 char buf[BUFFER_SIZE];
2726 int ms_iis5_hack = 0;
2727 unsigned long long byte_count = 0;
2728 int forwarded_connect_retries = 0;
2729 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
2730 const struct forward_spec *fwd;
2731 struct http_request *http;
2732 long len = 0; /* for buffer sizes (and negative error codes) */
2734 /* Function that does the content filtering for the current request */
2735 filter_function_ptr content_filter = NULL;
2737 /* Skeleton for HTTP response, if we should intercept the request */
2738 struct http_response *rsp;
2739 struct timeval timeout;
2741 memset(buf, 0, sizeof(buf));
2745 if (receive_client_request(csp) != JB_ERR_OK)
2749 if (parse_client_request(csp) != JB_ERR_OK)
2754 /* decide how to route the HTTP request */
2755 fwd = forward_url(csp, http);
2758 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2759 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2764 * build the http request to send to the server
2765 * we have to do one of the following:
2767 * create = use the original HTTP request to create a new
2768 * HTTP request that has either the path component
2769 * without the http://domainspec (w/path) or the
2770 * full orininal URL (w/url)
2771 * Note that the path and/or the HTTP version may
2772 * have been altered by now.
2774 * connect = Open a socket to the host:port of the server
2775 * and short-circuit server and client socket.
2777 * pass = Pass the request unchanged if forwarding a CONNECT
2778 * request to a parent proxy. Note that we'll be sending
2779 * the CFAIL message ourselves if connecting to the parent
2780 * fails, but we won't send a CSUCCEED message if it works,
2781 * since that would result in a double message (ours and the
2782 * parent's). After sending the request to the parent, we simply
2785 * here's the matrix:
2788 * +--------+--------+
2790 * 0 | create | connect|
2792 * Forwarding +--------+--------+
2794 * 1 | create | pass |
2796 * +--------+--------+
2800 if (http->ssl && connect_port_is_forbidden(csp))
2802 const char *acceptable_connect_ports =
2803 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2804 assert(NULL != acceptable_connect_ports);
2805 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2806 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2807 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2808 csp->action->flags |= ACTION_BLOCK;
2814 freez(csp->headers->first->str);
2815 build_request_line(csp, fwd, &csp->headers->first->str);
2819 * We have a request. Check if one of the crunchers wants it.
2821 if (crunch_response_triggered(csp, crunchers_all))
2824 * Yes. The client got the crunch response
2825 * and we are done here after cleaning up.
2827 /* XXX: why list_remove_all()? */
2828 list_remove_all(csp->headers);
2833 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2835 if (fwd->forward_host)
2837 log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
2838 fwd->forward_host, fwd->forward_port, http->hostport);
2842 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2845 /* here we connect to the server, gateway, or the forwarder */
2847 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2848 if ((csp->sfd != JB_INVALID_SOCKET)
2849 && socket_is_still_usable(csp->sfd)
2850 && connection_destination_matches(&csp->server_connection, http, fwd))
2852 log_error(LOG_LEVEL_CONNECT,
2853 "Reusing server socket %u. Opened for %s.",
2854 csp->sfd, csp->server_connection.host);
2858 if (csp->sfd != JB_INVALID_SOCKET)
2860 log_error(LOG_LEVEL_CONNECT,
2861 "Closing server socket %u. Opened for %s.",
2862 csp->sfd, csp->server_connection.host);
2863 close_socket(csp->sfd);
2864 mark_connection_closed(&csp->server_connection);
2866 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2868 while ((csp->sfd = forwarded_connect(fwd, http, csp))
2869 && (errno == EINVAL)
2870 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2872 log_error(LOG_LEVEL_ERROR,
2873 "failed request #%u to connect to %s. Trying again.",
2874 forwarded_connect_retries, http->hostport);
2877 if (csp->sfd == JB_INVALID_SOCKET)
2879 if (fwd->type != SOCKS_NONE)
2882 rsp = error_response(csp, "forwarding-failed", errno);
2884 else if (errno == EINVAL)
2886 rsp = error_response(csp, "no-such-domain", errno);
2890 rsp = error_response(csp, "connect-failed", errno);
2891 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2895 /* Write the answer to the client */
2898 send_crunch_response(csp, rsp);
2903 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2904 save_connection_destination(csp->sfd, http, fwd, &csp->server_connection);
2905 csp->server_connection.keep_alive_timeout = (unsigned)csp->config->keep_alive_timeout;
2907 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2909 hdr = list_to_text(csp->headers);
2912 /* FIXME Should handle error properly */
2913 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2915 list_remove_all(csp->headers);
2917 if (fwd->forward_host || (http->ssl == 0))
2920 * Write the client's (modified) header to the server
2921 * (along with anything else that may be in the buffer)
2923 if (write_socket(csp->sfd, hdr, strlen(hdr))
2924 || (flush_socket(csp->sfd, csp->iob) < 0))
2926 log_error(LOG_LEVEL_CONNECT,
2927 "write header to: %s failed: %E", http->hostport);
2929 rsp = error_response(csp, "connect-failed", errno);
2932 send_crunch_response(csp, rsp);
2942 * We're running an SSL tunnel and we're not forwarding,
2943 * so just send the "connect succeeded" message to the
2944 * client, flush the rest, and get out of the way.
2946 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2954 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2956 /* we're finished with the client's header */
2959 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
2961 /* pass data between the client and server
2962 * until one or the other shuts down the connection.
2971 * FD_ZERO here seems to point to an errant macro which crashes.
2972 * So do this by hand for now...
2974 memset(&rfds,0x00,sizeof(fd_set));
2978 FD_SET(csp->cfd, &rfds);
2979 FD_SET(csp->sfd, &rfds);
2981 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2982 if ((csp->flags & CSP_FLAG_CHUNKED)
2983 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2984 && ((csp->iob->eod - csp->iob->cur) >= 5)
2985 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2987 log_error(LOG_LEVEL_CONNECT,
2988 "Looks like we read the last chunk together with "
2989 "the server headers. We better stop reading.");
2990 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2991 csp->expected_content_length = byte_count;
2992 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2994 if (server_body && server_response_is_complete(csp, byte_count))
2996 log_error(LOG_LEVEL_CONNECT,
2997 "Done reading from server. Expected content length: %llu. "
2998 "Actual content length: %llu. Most recently received: %d.",
2999 csp->expected_content_length, byte_count, len);
3002 * XXX: should not jump around,
3003 * chat() is complicated enough already.
3007 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
3009 timeout.tv_sec = csp->config->socket_timeout;
3010 timeout.tv_usec = 0;
3011 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
3015 log_error(LOG_LEVEL_ERROR,
3016 "Didn't receive data in time: %s", http->url);
3017 if ((byte_count == 0) && (http->ssl == 0))
3019 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
3020 strlen(CONNECTION_TIMEOUT_RESPONSE));
3022 mark_server_socket_tainted(csp);
3027 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3028 mark_server_socket_tainted(csp);
3033 * This is the body of the browser's request,
3034 * just read and write it.
3036 * XXX: Make sure the client doesn't use pipelining
3037 * behind Privoxy's back.
3039 if (FD_ISSET(csp->cfd, &rfds))
3041 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
3045 /* XXX: not sure if this is necessary. */
3046 mark_server_socket_tainted(csp);
3047 break; /* "game over, man" */
3050 if (write_socket(csp->sfd, buf, (size_t)len))
3052 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3053 mark_server_socket_tainted(csp);
3060 * The server wants to talk. It could be the header or the body.
3061 * If `hdr' is null, then it's the header otherwise it's the body.
3062 * FIXME: Does `hdr' really mean `host'? No.
3064 if (FD_ISSET(csp->sfd, &rfds))
3067 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
3071 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3073 if (http->ssl && (fwd->forward_host == NULL))
3076 * Just hang up. We already confirmed the client's CONNECT
3077 * request with status code 200 and unencrypted content is
3078 * no longer welcome.
3080 log_error(LOG_LEVEL_ERROR,
3081 "CONNECT already confirmed. Unable to tell the client about the problem.");
3084 else if (byte_count)
3087 * Just hang up. We already transmitted the original headers
3088 * and parts of the original content and therefore missed the
3089 * chance to send an error message (without risking data corruption).
3091 * XXX: we could retry with a fancy range request here.
3093 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3094 "Unable to tell the client about the problem.");
3095 mark_server_socket_tainted(csp);
3099 * XXX: Consider handling the cases above the same.
3101 mark_server_socket_tainted(csp);
3105 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3106 if (csp->flags & CSP_FLAG_CHUNKED)
3108 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
3110 /* XXX: this is a temporary hack */
3111 log_error(LOG_LEVEL_CONNECT,
3112 "Looks like we reached the end of the last chunk. "
3113 "We better stop reading.");
3114 csp->expected_content_length = byte_count + (unsigned long long)len;
3115 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3119 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
3122 * Add a trailing zero to let be able to use string operations.
3123 * XXX: do we still need this with filter_popups gone?
3128 * Normally, this would indicate that we've read
3129 * as much as the server has sent us and we can
3130 * close the client connection. However, Microsoft
3131 * in its wisdom has released IIS/5 with a bug that
3132 * prevents it from sending the trailing \r\n in
3133 * a 302 redirect header (and possibly other headers).
3134 * To work around this if we've haven't parsed
3135 * a full header we'll append a trailing \r\n
3136 * and see if this now generates a valid one.
3138 * This hack shouldn't have any impacts. If we've
3139 * already transmitted the header or if this is a
3140 * SSL connection, then we won't bother with this
3141 * hack. So we only work on partially received
3142 * headers. If we append a \r\n and this still
3143 * doesn't generate a valid header, then we won't
3144 * transmit anything to the client.
3149 if (server_body || http->ssl)
3152 * If we have been buffering up the document,
3153 * now is the time to apply content modification
3154 * and send the result to the client.
3158 p = execute_content_filter(csp, content_filter);
3160 * If the content filter fails, use the original
3161 * buffer and length.
3162 * (see p != NULL ? p : csp->iob->cur below)
3166 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3169 if (JB_ERR_OK != update_server_headers(csp))
3171 log_error(LOG_LEVEL_FATAL,
3172 "Failed to update server headers. after filtering.");
3175 hdr = list_to_text(csp->headers);
3178 /* FIXME Should handle error properly */
3179 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3182 if (write_socket(csp->cfd, hdr, strlen(hdr))
3183 || write_socket(csp->cfd,
3184 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
3186 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3189 mark_server_socket_tainted(csp);
3197 break; /* "game over, man" */
3201 * This is NOT the body, so
3202 * Let's pretend the server just sent us a blank line.
3204 snprintf(buf, sizeof(buf), "\r\n");
3205 len = (int)strlen(buf);
3208 * Now, let the normal header parsing algorithm below do its
3209 * job. If it fails, we'll exit instead of continuing.
3216 * If this is an SSL connection or we're in the body
3217 * of the server document, just write it to the client,
3218 * unless we need to buffer the body for later content-filtering
3220 if (server_body || http->ssl)
3225 * If there is no memory left for buffering the content, or the buffer limit
3226 * has been reached, switch to non-filtering mode, i.e. make & write the
3227 * header, flush the iob and buf, and get out of the way.
3229 if (add_to_iob(csp, buf, len))
3234 log_error(LOG_LEVEL_INFO,
3235 "Flushing header and buffers. Stepping back from filtering.");
3237 hdr = list_to_text(csp->headers);
3241 * Memory is too tight to even generate the header.
3242 * Send our static "Out-of-memory" page.
3244 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3245 rsp = cgi_error_memory();
3246 send_crunch_response(csp, rsp);
3247 mark_server_socket_tainted(csp);
3250 hdrlen = strlen(hdr);
3252 if (write_socket(csp->cfd, hdr, hdrlen)
3253 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
3254 || (write_socket(csp->cfd, buf, (size_t)len)))
3256 log_error(LOG_LEVEL_CONNECT,
3257 "Flush header and buffers to client failed: %E");
3259 mark_server_socket_tainted(csp);
3264 * Reset the byte_count to the amount of bytes
3265 * we just flushed. len will be added a few lines below,
3266 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3268 byte_count = (unsigned long long)flushed;
3270 content_filter = NULL;
3276 if (write_socket(csp->cfd, buf, (size_t)len))
3278 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3279 mark_server_socket_tainted(csp);
3283 byte_count += (unsigned long long)len;
3288 const char *header_start;
3290 * We're still looking for the end of the server's header.
3291 * Buffer up the data we just read. If that fails, there's
3292 * little we can do but send our static out-of-memory page.
3294 if (add_to_iob(csp, buf, len))
3296 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3297 rsp = cgi_error_memory();
3298 send_crunch_response(csp, rsp);
3299 mark_server_socket_tainted(csp);
3303 header_start = csp->iob->cur;
3305 /* Convert iob into something sed() can digest */
3306 if (JB_ERR_PARSE == get_server_headers(csp))
3311 * Well, we tried our MS IIS/5 hack and it didn't work.
3312 * The header is incomplete and there isn't anything
3313 * we can do about it.
3315 log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3316 "Applying the MS IIS5 hack didn't help.");
3317 log_error(LOG_LEVEL_CLF,
3318 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3319 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3320 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3321 mark_server_socket_tainted(csp);
3327 * Since we have to wait for more from the server before
3328 * we can parse the headers we just continue here.
3330 long header_offset = csp->iob->cur - header_start;
3331 assert(csp->iob->cur >= header_start);
3332 byte_count += (unsigned long long)(len - header_offset);
3333 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
3334 "byte_count: %llu. header_offset: %d. len: %d.",
3335 byte_count, header_offset, len);
3340 /* Did we actually get anything? */
3341 if (NULL == csp->headers->first)
3343 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
3344 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3345 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
3346 free_http_request(http);
3347 mark_server_socket_tainted(csp);
3351 assert(csp->headers->first->str);
3353 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3354 strncmpic(csp->headers->first->str, "ICY", 3))
3357 * It doesn't look like a HTTP (or Shoutcast) response:
3358 * tell the client and log the problem.
3360 if (strlen(csp->headers->first->str) > 30)
3362 csp->headers->first->str[30] = '\0';
3364 log_error(LOG_LEVEL_ERROR,
3365 "Invalid server or forwarder response. Starts with: %s",
3366 csp->headers->first->str);
3367 log_error(LOG_LEVEL_CLF,
3368 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3369 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3370 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3371 free_http_request(http);
3372 mark_server_socket_tainted(csp);
3377 * We have now received the entire server header,
3378 * filter it and send the result to the client
3380 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3382 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
3384 hdr = list_to_text(csp->headers);
3387 /* FIXME Should handle error properly */
3388 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3391 if (crunch_response_triggered(csp, crunchers_light))
3394 * One of the tags created by a server-header
3395 * tagger triggered a crunch. We already
3396 * delivered the crunch response to the client
3397 * and are done here after cleaning up.
3400 mark_server_socket_tainted(csp);
3403 /* Buffer and pcrs filter this if appropriate. */
3405 if (!http->ssl) /* We talk plaintext */
3407 content_filter = get_filter_function(csp);
3410 * Only write if we're not buffering for content modification
3412 if (!content_filter)
3415 * Write the server's (modified) header to
3416 * the client (along with anything else that
3417 * may be in the buffer)
3420 if (write_socket(csp->cfd, hdr, strlen(hdr))
3421 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
3423 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
3426 * The write failed, so don't bother mentioning it
3427 * to the client... it probably can't hear us anyway.
3430 mark_server_socket_tainted(csp);
3434 byte_count += (unsigned long long)len;
3439 * XXX: the header lenght should probably
3440 * be calculated by get_server_headers().
3442 long header_length = csp->iob->cur - header_start;
3443 assert(csp->iob->cur > header_start);
3444 byte_count += (unsigned long long)(len - header_length);
3447 /* we're finished with the server's header */
3453 * If this was a MS IIS/5 hack then it means the server
3454 * has already closed the connection. Nothing more to read.
3459 log_error(LOG_LEVEL_ERROR,
3460 "Closed server connection detected. "
3461 "Applying the MS IIS5 hack didn't help.");
3462 log_error(LOG_LEVEL_CLF,
3463 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3464 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3465 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3466 mark_server_socket_tainted(csp);
3472 mark_server_socket_tainted(csp);
3473 return; /* huh? we should never get here */
3476 if (csp->content_length == 0)
3479 * If Privoxy didn't recalculate the Content-Lenght,
3480 * byte_count is still correct.
3482 csp->content_length = byte_count;
3485 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3486 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3487 && (csp->expected_content_length != byte_count))
3489 log_error(LOG_LEVEL_CONNECT,
3490 "Received %llu bytes while expecting %llu.",
3491 byte_count, csp->expected_content_length);
3492 mark_server_socket_tainted(csp);
3496 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3497 csp->ip_addr_str, http->ocmd, csp->content_length);
3501 /*********************************************************************
3505 * Description : This is little more than chat. We only "serve" to
3506 * to close (or remember) any socket that chat may have
3510 * 1 : csp = Current client state (buffers, headers, etc...)
3514 *********************************************************************/
3516 void serve(struct client_state *csp)
3517 #else /* ifndef AMIGA */
3518 static void serve(struct client_state *csp)
3519 #endif /* def AMIGA */
3521 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3522 static int monitor_thread_running = 0;
3523 int continue_chatting = 0;
3528 continue_chatting = (csp->config->feature_flags
3529 & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
3530 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
3531 && (csp->cfd != JB_INVALID_SOCKET)
3532 && (csp->sfd != JB_INVALID_SOCKET)
3533 && socket_is_still_usable(csp->sfd);
3535 if (continue_chatting)
3537 log_error(LOG_LEVEL_CONNECT,
3538 "Waiting for the next client request. "
3539 "Keeping the server socket %d to %s open.",
3540 csp->sfd, csp->server_connection.host);
3542 if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
3543 && data_is_available(csp->cfd, (int)csp->server_connection.keep_alive_timeout)
3544 && socket_is_still_usable(csp->cfd))
3546 log_error(LOG_LEVEL_CONNECT, "Client request arrived in "
3547 "time or the client closed the connection.");
3549 * Get the csp in a mostly vergin state again.
3550 * XXX: Should be done elsewhere.
3552 csp->content_type = 0;
3553 csp->content_length = 0;
3554 csp->expected_content_length = 0;
3555 list_remove_all(csp->headers);
3556 freez(csp->iob->buf);
3557 memset(csp->iob, 0, sizeof(csp->iob));
3558 freez(csp->error_message);
3559 free_http_request(csp->http);
3560 destroy_list(csp->headers);
3561 destroy_list(csp->tags);
3562 free_current_action(csp->action);
3563 if (NULL != csp->fwd)
3565 unload_forward_spec(csp->fwd);
3569 /* XXX: Store per-connection flags someplace else. */
3570 csp->flags = CSP_FLAG_ACTIVE | (csp->flags & CSP_FLAG_TOGGLED_ON);
3574 log_error(LOG_LEVEL_CONNECT,
3575 "No additional client request received in time.");
3576 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING))
3578 remember_connection(csp->sfd, csp->http,
3579 forward_url(csp, csp->http),
3580 csp->server_connection.keep_alive_timeout);
3581 csp->sfd = JB_INVALID_SOCKET;
3582 close_socket(csp->cfd);
3583 csp->cfd = JB_INVALID_SOCKET;
3584 privoxy_mutex_lock(&connection_reuse_mutex);
3585 if (!monitor_thread_running)
3587 monitor_thread_running = 1;
3588 privoxy_mutex_unlock(&connection_reuse_mutex);
3589 wait_for_alive_connections();
3590 privoxy_mutex_lock(&connection_reuse_mutex);
3591 monitor_thread_running = 0;
3593 privoxy_mutex_unlock(&connection_reuse_mutex);
3598 else if (csp->sfd != JB_INVALID_SOCKET)
3600 log_error(LOG_LEVEL_CONNECT,
3601 "The connection on server socket %d to %s isn't reusable. "
3602 "Closing.", csp->sfd, csp->server_connection.host);
3604 } while (continue_chatting);
3606 mark_connection_closed(&csp->server_connection);
3609 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3611 if (csp->sfd != JB_INVALID_SOCKET)
3613 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3614 forget_connection(csp->sfd);
3615 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3616 close_socket(csp->sfd);
3619 if (csp->cfd != JB_INVALID_SOCKET)
3621 close_socket(csp->cfd);
3624 csp->flags &= ~CSP_FLAG_ACTIVE;
3630 /*********************************************************************
3632 * Function : server_thread
3634 * Description : We only exist to call `serve' in a threaded environment.
3637 * 1 : data = Current client state (buffers, headers, etc...)
3639 * Returns : Always 0.
3641 *********************************************************************/
3642 static int32 server_thread(void *data)
3644 serve((struct client_state *) data);
3651 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3652 /*********************************************************************
3656 * Description : Print usage info & exit.
3658 * Parameters : Pointer to argv[0] for identifying ourselves
3662 *********************************************************************/
3663 static void usage(const char *myname)
3665 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
3669 #endif /* defined(unix) */
3672 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
3673 #endif /* defined(unix) */
3674 "[--version] [configfile]\n"
3675 "Aborting\n", myname);
3680 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
3683 #ifdef MUTEX_LOCKS_AVAILABLE
3684 /*********************************************************************
3686 * Function : privoxy_mutex_lock
3688 * Description : Locks a mutex.
3691 * 1 : mutex = The mutex to lock.
3693 * Returns : Void. May exit in case of errors.
3695 *********************************************************************/
3696 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
3698 #ifdef FEATURE_PTHREAD
3699 int err = pthread_mutex_lock(mutex);
3702 if (mutex != &log_mutex)
3704 log_error(LOG_LEVEL_FATAL,
3705 "Mutex locking failed: %s.\n", strerror(err));
3710 EnterCriticalSection(mutex);
3711 #endif /* def FEATURE_PTHREAD */
3715 /*********************************************************************
3717 * Function : privoxy_mutex_unlock
3719 * Description : Unlocks a mutex.
3722 * 1 : mutex = The mutex to unlock.
3724 * Returns : Void. May exit in case of errors.
3726 *********************************************************************/
3727 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
3729 #ifdef FEATURE_PTHREAD
3730 int err = pthread_mutex_unlock(mutex);
3733 if (mutex != &log_mutex)
3735 log_error(LOG_LEVEL_FATAL,
3736 "Mutex unlocking failed: %s.\n", strerror(err));
3741 LeaveCriticalSection(mutex);
3742 #endif /* def FEATURE_PTHREAD */
3746 /*********************************************************************
3748 * Function : privoxy_mutex_init
3750 * Description : Prepares a mutex.
3753 * 1 : mutex = The mutex to initialize.
3755 * Returns : Void. May exit in case of errors.
3757 *********************************************************************/
3758 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
3760 #ifdef FEATURE_PTHREAD
3761 int err = pthread_mutex_init(mutex, 0);
3764 printf("Fatal error. Mutex initialization failed: %s.\n",
3769 InitializeCriticalSection(mutex);
3770 #endif /* def FEATURE_PTHREAD */
3772 #endif /* def MUTEX_LOCKS_AVAILABLE */
3774 /*********************************************************************
3776 * Function : initialize_mutexes
3778 * Description : Prepares mutexes if mutex support is available.
3782 * Returns : Void, exits in case of errors.
3784 *********************************************************************/
3785 static void initialize_mutexes(void)
3787 #ifdef MUTEX_LOCKS_AVAILABLE
3789 * Prepare global mutex semaphores
3791 privoxy_mutex_init(&log_mutex);
3792 privoxy_mutex_init(&log_init_mutex);
3793 privoxy_mutex_init(&connection_reuse_mutex);
3796 * XXX: The assumptions below are a bit naive
3797 * and can cause locks that aren't necessary.
3799 * For example older FreeBSD versions (< 6.x?)
3800 * have no gethostbyname_r, but gethostbyname is
3803 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
3804 privoxy_mutex_init(&resolver_mutex);
3805 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
3807 * XXX: should we use a single mutex for
3808 * localtime() and gmtime() as well?
3810 #ifndef HAVE_GMTIME_R
3811 privoxy_mutex_init(&gmtime_mutex);
3812 #endif /* ndef HAVE_GMTIME_R */
3814 #ifndef HAVE_LOCALTIME_R
3815 privoxy_mutex_init(&localtime_mutex);
3816 #endif /* ndef HAVE_GMTIME_R */
3819 privoxy_mutex_init(&rand_mutex);
3820 #endif /* ndef HAVE_RANDOM */
3821 #endif /* def MUTEX_LOCKS_AVAILABLE */
3825 /*********************************************************************
3829 * Description : Load the config file and start the listen loop.
3830 * This function is a lot more *sane* with the `load_config'
3831 * and `listen_loop' functions; although it stills does
3832 * a *little* too much for my taste.
3835 * 1 : argc = Number of parameters (including $0).
3836 * 2 : argv = Array of (char *)'s to the parameters.
3838 * Returns : 1 if : can't open config file, unrecognized directive,
3839 * stats requested in multi-thread mode, can't open the
3840 * log file, can't open the jar file, listen port is invalid,
3841 * any load fails, and can't bind port.
3843 * Else main never returns, the process must be signaled
3844 * to terminate execution. Or, on Windows, use the
3845 * "File", "Exit" menu option.
3847 *********************************************************************/
3849 int real_main(int argc, const char *argv[])
3851 int main(int argc, const char *argv[])
3855 unsigned int random_seed;
3857 struct passwd *pw = NULL;
3858 struct group *grp = NULL;
3861 char *pre_chroot_nslookup_to_load_resolver = NULL;
3868 #if !defined(_WIN32)
3875 /* Prepare mutexes if supported and necessary. */
3876 initialize_mutexes();
3878 /* Enable logging until further notice. */
3882 * Parse the command line arguments
3884 * XXX: simply printing usage information in case of
3885 * invalid arguments isn't particularly user friendly.
3887 while (++argc_pos < argc)
3890 /* Check to see if the service must be installed or uninstalled */
3891 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3893 const char *pName = argv[argc_pos] + 9;
3896 exit( (install_service(pName)) ? 0 : 1 );
3898 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3900 const char *pName = argv[argc_pos] + 11;
3903 exit((uninstall_service(pName)) ? 0 : 1);
3905 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3907 bRunAsService = TRUE;
3908 w32_set_service_cwd();
3909 atexit(w32_service_exit_notify);
3912 #endif /* defined(_WIN32) */
3915 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3917 if (strcmp(argv[argc_pos], "--help") == 0)
3922 else if(strcmp(argv[argc_pos], "--version") == 0)
3924 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3930 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3932 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
3936 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3938 if (++argc_pos == argc) usage(argv[0]);
3939 pidfile = strdup(argv[argc_pos]);
3942 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3944 if (++argc_pos == argc) usage(argv[argc_pos]);
3946 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3949 if (NULL == (grp = getgrnam(p)))
3951 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3955 if (NULL == (pw = getpwnam(argv[argc_pos])))
3957 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3960 if (p != NULL) *--p = '\0';
3963 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3965 if (++argc_pos == argc) usage(argv[0]);
3966 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3969 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3973 #endif /* defined(unix) */
3975 else if (argc_pos + 1 != argc)
3978 * This is neither the last command line
3979 * option, nor was it recognized before,
3980 * therefore it must be invalid.
3986 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3988 configfile = argv[argc_pos];
3991 } /* -END- while (more arguments) */
3993 show_version(Argv[0]);
3996 if ( *configfile != '/' )
3998 char cwd[BUFFER_SIZE];
4000 size_t abs_file_size;
4002 /* make config-filename absolute here */
4003 if (NULL == getcwd(cwd, sizeof(cwd)))
4005 perror("failed to get current working directory");
4010 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
4011 basedir = strdup(cwd);
4013 if (NULL == basedir ||
4014 NULL == (abs_file = malloc(abs_file_size)))
4016 perror("malloc failed");
4019 strlcpy(abs_file, basedir, abs_file_size);
4020 strlcat(abs_file, "/", abs_file_size );
4021 strlcat(abs_file, configfile, abs_file_size);
4022 configfile = abs_file;
4024 #endif /* defined unix */
4028 clients->next = NULL;
4030 /* XXX: factor out initialising after the next stable release. */
4033 #elif defined(_WIN32)
4037 random_seed = (unsigned int)time(NULL);
4039 srandom(random_seed);
4042 #endif /* ifdef HAVE_RANDOM */
4045 * Unix signal handling
4047 * Catch the abort, interrupt and terminate signals for a graceful exit
4048 * Catch the hangup signal so the errlog can be reopened.
4049 * Ignore the broken pipe signals (FIXME: Why?)
4051 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
4054 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
4055 const int ignored_signals[] = { SIGPIPE, 0 };
4057 for (idx = 0; catched_signals[idx] != 0; idx++)
4059 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
4060 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
4062 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
4063 #endif /* ifdef sun */
4065 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
4069 for (idx = 0; ignored_signals[idx] != 0; idx++)
4071 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
4073 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
4078 #else /* ifdef _WIN32 */
4079 # ifdef _WIN_CONSOLE
4081 * We *are* in a windows console app.
4082 * Print a verbose messages about FAQ's and such
4084 printf("%s", win32_blurb);
4085 # endif /* def _WIN_CONSOLE */
4086 #endif /* def _WIN32 */
4089 /* Initialize the CGI subsystem */
4090 cgi_init_error_messages();
4093 * If runnig on unix and without the --nodaemon
4094 * option, become a daemon. I.e. fork, detach
4095 * from tty and get process group leadership
4108 if ( pid < 0 ) /* error */
4113 else if ( pid != 0 ) /* parent */
4118 * must check for errors
4119 * child died due to missing files aso
4122 wpid = waitpid( pid, &status, WNOHANG );
4131 /* Should be more portable, but not as well tested */
4136 #else /* ndef __FreeBSD__ */
4138 #endif /* ndef __FreeBSD__ */
4139 fd = open("/dev/tty", O_RDONLY);
4142 /* no error check here */
4143 ioctl( fd, TIOCNOTTY,0 );
4148 * stderr (fd 2) will be closed later on,
4149 * when the config file has been parsed.
4156 } /* -END- if (!no_daemon) */
4159 * As soon as we have written the PID file, we can switch
4160 * to the user and group ID indicated by the --user option
4166 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
4168 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
4172 if (setgroups(1, &grp->gr_gid))
4174 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
4177 else if (initgroups(pw->pw_name, pw->pw_gid))
4179 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
4185 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
4187 /* Read the time zone file from /etc before doing chroot. */
4189 if (NULL != pre_chroot_nslookup_to_load_resolver
4190 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
4192 /* Initialize resolver library. */
4193 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
4195 if (chroot(pw->pw_dir) < 0)
4197 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
4201 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
4204 if (setuid(pw->pw_uid))
4206 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
4210 char putenv_dummy[64];
4212 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
4213 if (putenv(putenv_dummy) != 0)
4215 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
4218 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
4219 if (putenv(putenv_dummy) != 0)
4221 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
4227 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
4230 #endif /* defined unix */
4233 /* This will be FALSE unless the command line specified --service
4237 /* Yup, so now we must attempt to establish a connection
4238 * with the service dispatcher. This will only work if this
4239 * process was launched by the service control manager to
4240 * actually run as a service. If this isn't the case, i've
4241 * known it take around 30 seconds or so for the call to return.
4244 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
4245 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
4247 /* Service has run, and at this point is now being stopped, so just return */
4252 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
4254 /* An error occurred. Usually it's because --service was wrongly specified
4255 * and we were unable to connect to the Service Control Dispatcher because
4256 * it wasn't expecting us and is therefore not listening.
4258 * For now, just continue below to call the listen_loop function.
4261 #endif /* def _WIN32 */
4271 /*********************************************************************
4273 * Function : bind_port_helper
4275 * Description : Bind the listen port. Handles logging, and aborts
4279 * 1 : config = Privoxy configuration. Specifies port
4282 * Returns : Port that was opened.
4284 *********************************************************************/
4285 static jb_socket bind_port_helper(struct configuration_spec * config)
4290 if (config->haddr == NULL)
4292 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
4297 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
4298 config->hport, config->haddr);
4301 result = bind_port(config->haddr, config->hport, &bfd);
4308 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4309 "There may be another Privoxy or some other "
4310 "proxy running on port %d",
4311 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
4312 config->hport, config->hport);
4315 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4316 "The hostname is not resolvable",
4317 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4320 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
4321 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4324 /* shouldn't get here */
4325 return JB_INVALID_SOCKET;
4328 config->need_bind = 0;
4335 /* Without this simple workaround we get this compiler warning from _beginthread
4336 * warning C4028: formal parameter 1 different from declaration
4338 void w32_service_listen_loop(void *p)
4342 #endif /* def _WIN32 */
4345 /*********************************************************************
4347 * Function : listen_loop
4349 * Description : bind the listen port and enter a "FOREVER" listening loop.
4355 *********************************************************************/
4356 static void listen_loop(void)
4358 struct client_state *csp = NULL;
4360 struct configuration_spec *config;
4361 unsigned int active_threads = 0;
4363 config = load_config();
4365 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4367 * XXX: Should be relocated once it no
4368 * longer needs to emit log messages.
4370 initialize_reusable_connections();
4371 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4373 bfd = bind_port_helper(config);
4375 #ifdef FEATURE_GRACEFUL_TERMINATION
4376 while (!g_terminate)
4381 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
4382 while (waitpid(-1, NULL, WNOHANG) > 0)
4384 /* zombie children */
4386 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
4389 * Free data that was used by died threads
4391 active_threads = sweep();
4395 * Re-open the errlog after HUP signal
4397 if (received_hup_signal)
4399 if (NULL != config->logfile)
4401 init_error_log(Argv[0], config->logfile);
4403 received_hup_signal = 0;
4407 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
4409 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
4413 csp->flags |= CSP_FLAG_ACTIVE;
4414 csp->sfd = JB_INVALID_SOCKET;
4416 csp->config = config = load_config();
4418 if ( config->need_bind )
4421 * Since we were listening to the "old port", we will not see
4422 * a "listen" param change until the next request. So, at
4423 * least 1 more request must be made for us to find the new
4424 * setting. I am simply closing the old socket and binding the
4427 * Which-ever is correct, we will serve 1 more page via the
4428 * old settings. This should probably be a "show-proxy-args"
4429 * request. This should not be a so common of an operation
4430 * that this will hurt people's feelings.
4435 bfd = bind_port_helper(config);
4438 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
4440 if (!accept_connection(csp, bfd))
4442 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
4455 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
4458 #ifdef FEATURE_TOGGLE
4459 if (global_toggle_state)
4460 #endif /* def FEATURE_TOGGLE */
4462 csp->flags |= CSP_FLAG_TOGGLED_ON;
4465 if (run_loader(csp))
4467 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
4468 /* Never get here - LOG_LEVEL_FATAL causes program exit */
4472 if (block_acl(NULL,csp))
4474 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
4475 close_socket(csp->cfd);
4476 freez(csp->ip_addr_str);
4480 #endif /* def FEATURE_ACL */
4482 if ((0 != config->max_client_connections)
4483 && (active_threads >= config->max_client_connections))
4485 log_error(LOG_LEVEL_CONNECT,
4486 "Rejecting connection from %s. Maximum number of connections reached.",
4488 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
4489 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
4490 close_socket(csp->cfd);
4491 freez(csp->ip_addr_str);
4496 /* add it to the list of clients */
4497 csp->next = clients->next;
4498 clients->next = csp;
4500 if (config->multi_threaded)
4504 /* this is a switch () statment in the C preprocessor - ugh */
4505 #undef SELECTED_ONE_OPTION
4507 /* Use Pthreads in preference to native code */
4508 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
4509 #define SELECTED_ONE_OPTION
4511 pthread_t the_thread;
4512 pthread_attr_t attrs;
4514 pthread_attr_init(&attrs);
4515 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
4516 errno = pthread_create(&the_thread, &attrs,
4517 (void * (*)(void *))serve, csp);
4518 child_id = errno ? -1 : 0;
4519 pthread_attr_destroy(&attrs);
4523 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
4524 #define SELECTED_ONE_OPTION
4525 child_id = _beginthread(
4526 (void (*)(void *))serve,
4531 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
4532 #define SELECTED_ONE_OPTION
4533 child_id = _beginthread(
4534 (void(* _Optlink)(void*))serve,
4540 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
4541 #define SELECTED_ONE_OPTION
4543 thread_id tid = spawn_thread
4544 (server_thread, "server", B_NORMAL_PRIORITY, csp);
4546 if ((tid >= 0) && (resume_thread(tid) == B_OK))
4548 child_id = (int) tid;
4557 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
4558 #define SELECTED_ONE_OPTION
4559 csp->cfd = ReleaseSocket(csp->cfd, -1);
4562 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4563 NP_Output, Output(),
4564 NP_CloseOutput, FALSE,
4565 NP_Name, (ULONG)"privoxy child",
4569 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4570 NP_Output, Output(),
4571 NP_CloseOutput, FALSE,
4572 NP_Name, (ULONG)"privoxy child",
4573 NP_StackSize, 200*1024,
4579 ((struct Task *)child_id)->tc_UserData = csp;
4580 Signal((struct Task *)child_id, SIGF_SINGLE);
4585 #if !defined(SELECTED_ONE_OPTION)
4588 /* This block is only needed when using fork().
4589 * When using threads, the server thread was
4590 * created and run by the call to _beginthread().
4592 if (child_id == 0) /* child */
4595 #ifdef FEATURE_TOGGLE
4596 int inherited_toggle_state = global_toggle_state;
4597 #endif /* def FEATURE_TOGGLE */
4602 * If we've been toggled or we've blocked the request, tell Mom
4605 #ifdef FEATURE_TOGGLE
4606 if (inherited_toggle_state != global_toggle_state)
4608 rc |= RC_FLAG_TOGGLED;
4610 #endif /* def FEATURE_TOGGLE */
4612 #ifdef FEATURE_STATISTICS
4613 if (csp->flags & CSP_FLAG_REJECTED)
4615 rc |= RC_FLAG_BLOCKED;
4617 #endif /* ndef FEATURE_STATISTICS */
4621 else if (child_id > 0) /* parent */
4623 /* in a fork()'d environment, the parent's
4624 * copy of the client socket and the CSP
4628 #if !defined(_WIN32) && !defined(__CYGWIN__)
4630 wait( &child_status );
4633 * Evaluate child's return code: If the child has
4634 * - been toggled, toggle ourselves
4635 * - blocked its request, bump up the stats counter
4638 #ifdef FEATURE_TOGGLE
4639 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
4641 global_toggle_state = !global_toggle_state;
4643 #endif /* def FEATURE_TOGGLE */
4645 #ifdef FEATURE_STATISTICS
4647 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
4651 #endif /* def FEATURE_STATISTICS */
4653 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
4654 close_socket(csp->cfd);
4655 csp->flags &= ~CSP_FLAG_ACTIVE;
4659 #undef SELECTED_ONE_OPTION
4660 /* end of cpp switch () */
4665 * Spawning the child failed, assume it's because
4666 * there are too many children running already.
4667 * XXX: If you assume ...
4669 log_error(LOG_LEVEL_ERROR,
4670 "Unable to take any additional connections: %E");
4671 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
4672 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
4673 close_socket(csp->cfd);
4674 csp->flags &= ~CSP_FLAG_ACTIVE;
4683 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
4685 /* Clean up. Aim: free all memory (no leaks) */
4686 #ifdef FEATURE_GRACEFUL_TERMINATION
4688 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
4690 unload_current_config_file();
4691 unload_current_actions_file();
4692 unload_current_re_filterfile();
4693 #ifdef FEATURE_TRUST
4694 unload_current_trust_file();
4697 if (config->multi_threaded)
4704 } while ((clients->next != NULL) && (--i > 0));
4708 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
4719 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
4720 /* Cleanup - remove taskbar icon etc. */
4725 #endif /* FEATURE_GRACEFUL_TERMINATION */