1 const char jcc_rcs[] = "$Id: jcc.c,v 1.237 2009/03/27 14:32:04 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 1.237 2009/03/27 14:32:04 fabiankeil
37 * If spawning a child in listen_loop() fails, send a real
38 * HTTP response to the client and continue listening for
39 * new connections without artificial delay.
41 * Revision 1.236 2009/03/25 17:30:24 fabiankeil
42 * In serve(), keep the client socket open until we marked the
43 * server socket as unused. This should increase the chances
44 * that we reuse the connection for the client's next request
45 * to the same destination.
47 * Revision 1.235 2009/03/18 21:01:20 fabiankeil
48 * Comment fix. Spotted by Roland.
50 * Revision 1.234 2009/03/18 20:48:42 fabiankeil
51 * If the --no-daemon option is used, enable LOG_LEVEL_INFO
52 * before the config file has been parsed (as we always did).
54 * Revision 1.233 2009/03/13 14:10:07 fabiankeil
55 * Fix some more harmless warnings on amd64.
57 * Revision 1.232 2009/03/08 19:29:16 fabiankeil
58 * Reinitialize the timeout structure every time before passing
59 * it to select(). Apparently some implementations mess with it.
60 * Probably fixes #2669131 reported by cyberpatrol.
62 * Revision 1.231 2009/03/08 14:19:23 fabiankeil
63 * Fix justified (but harmless) compiler warnings
64 * on platforms where sizeof(int) < sizeof(long).
66 * Revision 1.230 2009/03/07 13:09:17 fabiankeil
67 * Change csp->expected_content and_csp->expected_content_length from
68 * size_t to unsigned long long to reduce the likelihood of integer
69 * overflows that would let us close the connection prematurely.
70 * Bug found while investigating #2669131, reported by cyberpatrol.
72 * Revision 1.229 2009/03/07 11:17:01 fabiankeil
73 * Fix compiler warning.
75 * Revision 1.228 2009/03/06 20:30:13 fabiankeil
76 * Log unsigned values as such.
78 * Revision 1.227 2009/03/02 19:18:11 fabiankeil
79 * Streamline parse_http_request()'s prototype. As
80 * cparser pointed out it doesn't actually use csp.
82 * Revision 1.226 2009/03/01 18:28:24 fabiankeil
83 * Help clang understand that we aren't dereferencing
86 * Revision 1.225 2009/02/19 18:09:32 fabiankeil
87 * Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
90 * Revision 1.224 2009/02/14 15:32:04 fabiankeil
91 * Add the request URL to the timeout message in chat().
94 * Revision 1.223 2009/02/09 21:21:16 fabiankeil
95 * Now that init_log_module() is called earlier, call show_version()
96 * later on from main() directly so it doesn't get called for --help
99 * Revision 1.222 2009/02/08 12:56:51 fabiankeil
100 * Call initialize_mutexes() before init_log_module() again.
101 * Broken since r220, might be the cause of Lee's #2579448.
103 * Revision 1.221 2009/02/06 18:02:58 fabiankeil
104 * When dropping privileges, also give up membership in supplementary
105 * groups. Thanks to Matthias Drochner for reporting the problem,
106 * providing the initial patch and testing the final version.
108 * Revision 1.220 2009/02/04 18:29:07 fabiankeil
109 * Initialize the log module before parsing arguments.
110 * Thanks to Matthias Drochner for the report.
112 * Revision 1.219 2009/01/31 16:08:21 fabiankeil
113 * Remove redundant error check in receive_client_request().
115 * Revision 1.218 2009/01/31 12:25:54 fabiankeil
116 * Flatten indentation in receive_client_request().
118 * Revision 1.217 2009/01/07 19:50:09 fabiankeil
119 * - If the socket-timeout has been reached and the client
120 * hasn't received any data yet, send an explanation before
121 * closing the connection.
122 * - In get_request_line(), signal timeouts the right way.
124 * Revision 1.216 2008/12/24 22:13:11 ler762
125 * fix GCC 3.4.4 warning
127 * Revision 1.215 2008/12/24 17:06:19 fabiankeil
128 * Keep a thread around to timeout alive connections
129 * even if no new requests are coming in.
131 * Revision 1.214 2008/12/20 14:53:55 fabiankeil
132 * Add config option socket-timeout to control the time
133 * Privoxy waits for data to arrive on a socket. Useful
134 * in case of stale ssh tunnels or when fuzz-testing.
136 * Revision 1.213 2008/12/15 18:45:51 fabiankeil
137 * When logging crunches, log the whole URL, so one can easily
138 * differentiate between vanilla HTTP and CONNECT requests.
140 * Revision 1.212 2008/12/14 15:46:22 fabiankeil
141 * Give crunched requests their own log level.
143 * Revision 1.211 2008/12/06 10:05:03 fabiankeil
144 * Downgrade "Received x bytes while expecting y." message to
145 * LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
147 * Revision 1.210 2008/12/02 22:03:18 fabiankeil
148 * Don't miscalculate byte_count if we don't get all the
149 * server headers with one read_socket() call. With keep-alive
150 * support enabled, this caused delays until the server closed
153 * Revision 1.209 2008/11/27 09:44:04 fabiankeil
154 * Cosmetics for the last commit: Don't watch out for
155 * the last chunk if the content isn't chunk-encoded or
156 * if we already determined the content length previously.
158 * Revision 1.208 2008/11/26 18:24:17 fabiankeil
159 * Recognize that the server response is complete if the
160 * last chunk is read together with the server headers.
163 * Revision 1.207 2008/11/25 17:25:16 fabiankeil
164 * Don't convert the client-header list to text until we need to.
166 * Revision 1.206 2008/11/23 17:00:11 fabiankeil
167 * Some more chat() cosmetics.
169 * Revision 1.205 2008/11/16 12:43:49 fabiankeil
170 * Turn keep-alive support into a runtime feature
171 * that is disabled by setting keep-alive-timeout
172 * to a negative value.
174 * Revision 1.204 2008/11/06 19:42:17 fabiankeil
175 * Fix last-chunk detection hack to also apply
176 * if buf[] contains nothing but the last-chunk.
178 * Revision 1.203 2008/11/06 18:34:35 fabiankeil
179 * Factor receive_client_request() and
180 * parse_client_request() out of chat().
182 * Revision 1.202 2008/11/02 18:40:34 fabiankeil
183 * If we received a different amount of data than we expected,
184 * log a warning and make sure the server socket isn't reused.
186 * Revision 1.201 2008/11/02 16:48:20 fabiankeil
187 * Revert revision 1.195 and try again.
189 * Revision 1.200 2008/10/26 16:53:18 fabiankeil
192 * Revision 1.199 2008/10/26 15:36:10 fabiankeil
193 * Remove two debug messages with LOG_LEVEL_INFO.
195 * Revision 1.198 2008/10/22 15:19:55 fabiankeil
196 * Once More, With Feeling: if there is no logfile
197 * because the user didn't specify one, we shouldn't
198 * call init_error_log() after receiving SIGHUP either.
200 * Revision 1.197 2008/10/20 17:02:40 fabiankeil
201 * If SIGHUP is received while we aren't running in daemon
202 * mode, calling init_error_log() would be a mistake.
204 * Revision 1.196 2008/10/16 09:16:41 fabiankeil
205 * - Fix two gcc44 conversion warnings.
206 * - Don't bother logging the last five bytes
209 * Revision 1.195 2008/10/13 16:04:37 fabiankeil
210 * Make sure we don't try to reuse tainted server sockets.
212 * Revision 1.194 2008/10/12 18:35:18 fabiankeil
213 * The last commit was a bit too ambitious, apparently the content
214 * length adjustment is only necessary if we aren't buffering.
216 * Revision 1.193 2008/10/12 15:57:35 fabiankeil
217 * Fix content length calculation if we read headers
218 * and the start of the body at once. Now that we have
219 * FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
221 * Revision 1.192 2008/10/11 18:19:14 fabiankeil
222 * Even more chat() cosmetics.
224 * Revision 1.191 2008/10/11 18:00:14 fabiankeil
225 * Reformat some comments in chat().
227 * Revision 1.190 2008/10/11 14:58:00 fabiankeil
228 * In case of chunk-encoded content, stop reading if
229 * the buffer looks like it ends with the last chunk.
231 * Revision 1.189 2008/10/11 09:53:00 fabiankeil
232 * Let server_response_is_complete() deal properly with
233 * content that is neither buffered nor read all at once.
235 * Revision 1.188 2008/10/09 18:21:41 fabiankeil
236 * Flush work-in-progress changes to keep outgoing connections
237 * alive where possible. Incomplete and mostly #ifdef'd out.
239 * Revision 1.187 2008/09/07 12:35:05 fabiankeil
240 * Add mutex lock support for _WIN32.
242 * Revision 1.186 2008/09/04 08:13:58 fabiankeil
243 * Prepare for critical sections on Windows by adding a
244 * layer of indirection before the pthread mutex functions.
246 * Revision 1.185 2008/08/30 12:03:07 fabiankeil
247 * Remove FEATURE_COOKIE_JAR.
249 * Revision 1.184 2008/08/22 15:34:45 fabiankeil
250 * - Silence LLVM/Clang complaint.
251 * - Make received_hup_signal static.
252 * - Hide definitions for basedir, pidfile and received_hup_signal
253 * from __EMX__ as they only seem to be used in case of #ifdef unix.
255 * Revision 1.183 2008/08/21 07:09:35 fabiankeil
256 * Accept Shoutcast responses again. Problem reported
257 * and fix suggested by Stefan in #2062860.
259 * Revision 1.182 2008/06/27 11:13:56 fabiankeil
260 * Fix possible NULL-pointer dereference reported
261 * by din_a4 in #2003937. Pointy hat to me.
263 * Revision 1.181 2008/05/21 15:47:15 fabiankeil
264 * Streamline sed()'s prototype and declare
265 * the header parse and add structures static.
267 * Revision 1.180 2008/05/21 15:26:32 fabiankeil
268 * - Mark csp as immutable for send_crunch_response().
269 * - Fix comment spelling.
271 * Revision 1.179 2008/05/20 20:13:32 fabiankeil
272 * Factor update_server_headers() out of sed(), ditch the
273 * first_run hack and make server_patterns_light static.
275 * Revision 1.178 2008/05/10 13:23:38 fabiankeil
276 * Don't provide get_header() with the whole client state
277 * structure when it only needs access to csp->iob.
279 * Revision 1.177 2008/05/10 11:51:12 fabiankeil
280 * Make the "read the rest of the headers" loop a bit more readable.
282 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
283 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
284 * - Remove useless comment.
286 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
287 * Fix comment grammar.
289 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
290 * Remove the pointless buffer in client_protocol_is_unsupported().
292 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
293 * Least-effort fix for bug #1821930 (reported by Lee):
294 * If the response doesn't look like HTTP,
295 * tell the client and log the problem.
297 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
298 * Don't pass the whole csp structure to flush_socket()
299 * when it only needs a file descriptor and a buffer.
301 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
302 * Remove kill-popups action.
304 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
305 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
307 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
308 * Remove the treat-forbidden-connects-like-blocks action. We now
309 * use the "blocked" page for forbidden CONNECT requests by default.
311 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
312 * Also use shiny new connect_port_is_forbidden() in jcc.c.
314 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
315 * Rename url_actions() to get_url_actions() and let it
316 * use the standard parameter ordering.
318 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
319 * Let forward_url() use the standard parameter ordering
320 * and mark its second parameter immutable.
322 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
323 * Remove the "Listening ... for local connections only" log message.
324 * Whether or not remote connections are able to reach Privoxy is up
325 * to the operating system.
327 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
328 * Prevent the log messages for CONNECT requests to unacceptable
329 * ports from printing the limit-connect argument as [null] if
330 * limit-connect hasn't been explicitly enabled.
332 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
333 * Make sure all console-mode apps get a usage() instance
335 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
336 * Reword NO_SERVER_DATA_RESPONSE to make it harder
337 * to misunderstand what the message is all about.
339 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
340 * Unbreak trustfile which previously didn't work without
341 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
343 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
344 * Plug memory leak. Spotted by Valgrind, triggered by
345 * Privoxy-Regression-Test feeding proxyfuzz.py.
347 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
348 * In the HTTP snipplets, refer to the client as client.
350 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
351 * Emit a log message when activating the MS IIS5 hack.
353 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
354 * Log the "weak randomization factor" warning only
355 * once for mingw32 and provide some more details.
357 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
358 * Initialize log module after initializing mutexes, future
359 * deadlocks in that code should now work cross-platform.
361 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
362 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
363 * Reported by Bert van Leeuwen in BR#1818808.
365 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
366 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
368 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
369 * When in daemon mode, close stderr after the configuration file has been
370 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
372 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
373 * - Fix a crash when parsing invalid requests whose first header
374 * is rejected by get_header(). Regression (re?)introduced
375 * in r1.143 by yours truly.
376 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
377 * client_cookie_adder() to make sure send-vanilla-wafer can be
378 * controlled through tags (and thus regression-tested).
380 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
381 * - Move get_filter_function() from jcc.c to filters.c
382 * so the filter functions can be static.
383 * - Don't bother filtering body-less responses.
385 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
386 * Execute content filters through execute_content_filter().
388 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
389 * Initialize req to NULL to make sure it's defined if the
390 * first read_socket() call fails. Reported by icmp30.
392 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
393 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
394 * extensive comments moved to user manual.
396 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
397 * Don't crash if a broken header filter wiped out the request line.
399 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
400 * Fix byte_count calculation in case of flushes
401 * and don't parse the server headers a second time.
403 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
404 * - If there's a connection problem after we already forwarded
405 * parts of the original content, just hang up. Fixes BR#1776724.
406 * - Fix warnings about unused code on mingw32.
407 * - In case of flushes, calculate the byte count
408 * less incorrectly (I think).
410 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
411 * Add some more prototypes for static functions.
413 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
414 * Comment out request_contains_null_bytes() until it's used again.
416 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
417 * #1763173 from Stefan Huehner: s@const static@static const@
418 * and declare some more functions static.
420 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
421 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
422 * and explain why they were rejected in the first place.
423 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
424 * CONNECT requests. The request line was missing.
425 * - Add two more XXX reminders as we don't have enough already.
427 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
428 * As Hal noticed, checking dispatch_cgi() as the last cruncher
429 * looks like a bug if CGI requests are blocked unintentionally,
430 * so don't do it unless the user enabled the new config option
431 * "allow-cgi-request-crunching".
433 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
434 * - Allow to rewrite the request destination behind the client's back.
435 * - Turn the weird-looking unconditional for loop that
436 * reads the client request into a conditional while loop.
437 * Move the stuff that only runs once out of the loop.
438 * - Move parts of chat(), server_content_type() and the
439 * necessary stuff to fix BR#1750917 into get_filter_function().
441 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
442 * Temporary workaround for BR#1730105.
444 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
445 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
446 * deadlocks and crashes on OpenBSD and possibly other OS with neither
447 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
448 * Thanks to Ralf Horstmann for report and solution.
450 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
451 * Add forward-override{} to change the forwarding settings through
452 * action sections. This is mainly interesting to forward different
453 * clients differently (for example based on User-Agent or request
456 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
457 * - Let usage() mention the --chroot parameter.
458 * - Use read_socket() consistently and always leave
459 * the last buffer byte alone, even in cases where
460 * null termination (currently) doesn't matter.
462 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
463 * - Fix config file loading on Unix if no config file is specified.
464 * Since r1.97 Privoxy would always interpret the last argument as
465 * config file, even if it's a valid command line option.
466 * - Abort in case of unrecognized command line options. Closes #1719696.
467 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
468 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
470 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
471 * - Don't rerun crunchers that only depend on the request URL.
472 * - Don't count redirects and CGI requests as "blocked requests".
474 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
475 * Support crunching based on tags created by server-header taggers.
477 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
478 * Make HTTP snippets static (again). Add a Content-Type for those
479 * with content so the browser doesn't guess it based on the URL.
481 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
482 * Move crunching and request line rebuilding out of chat().
484 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
485 * Introduce tags as alternative way to specify which
486 * actions apply to a request. At the moment tags can be
487 * created based on client and server headers.
489 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
490 * Don't CLF-log CONNECT requests twice.
492 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
493 * Log the source address for ACL-related connection drops.
495 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
496 * New config option: enforce-blocks.
498 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
499 * - Move null byte check into separate function.
500 * - Don't confuse the client with error pages
501 * if a CONNECT request was already confirmed.
503 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
504 * Speed up NULL byte escaping and only log the complete
505 * NULL byte requests with header debugging enabled.
507 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
508 * Answer requests that contain NULL bytes with
509 * a custom response instead of waiting for more
510 * data until the client eventually hangs up.
512 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
513 * - Move delivery and logging of crunched responses
514 * from chat() into send_crunch_response().
515 * - Display the reason for generating http_responses.
516 * - Log the content length for LOG_LEVEL_CLF correctly
517 * (still incorrect for some fixed responses).
518 * - Reword an incorrect comment about
519 * treat-forbidden-connects-like-blocks violating
521 * - Add some log messages.
523 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
524 * Move mutex initialization into separate
525 * function and exit in case of errors.
527 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
528 * - Start to reduce chat()'s line count and move
529 * parts of it into separate functions.
530 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
532 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
533 * - Add Proxy-Agent header to HTTP snippets that are
534 * supposed to reach HTTP clients only.
535 * - Made a few CONNECT log messages more descriptive.
536 * - Catch completely empty server responses (as seen
537 * with Tor's fake ".noconnect" top level domain).
538 * - Use shiny new "forwarding-failed" template for socks errors.
540 * Revision 1.118 2007/01/07 07:43:43 joergs
541 * AmigaOS4 support added.
543 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
544 * Added config option accept-intercepted-requests
545 * and disabled it by default.
547 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
548 * Reverted parts of my last commit
549 * to keep error handling working.
551 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
552 * Fixed gcc43 conversion warnings.
554 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
555 * Fix -pedantic ISO C warning about converting
556 * from function pointer to object pointer.
558 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
559 * Silence compiler warning I introduced with my last commit.
561 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
562 * Mutex protect rand() if POSIX threading
563 * is used, warn the user if that's not possible
564 * and stop using it on _WIN32 where it could
567 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
568 * Don't prevent core dumps by catching SIGABRT.
569 * It's rude and makes debugging unreasonable painful.
571 * Revision 1.110 2006/12/13 14:52:53 etresoft
572 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
574 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
575 * Privoxy is now able to run as intercepting
576 * proxy in combination with any packet filter
577 * that does the port redirection. The destination
578 * is extracted from the "Host:" header which
579 * should be available for nearly all requests.
581 * Moved HTTP snipplets into jcc.c.
582 * Added error message for gopher proxy requests.
584 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
585 * Only unlink the pidfile if it's actually used.
587 * Change order of interception checks to make
588 * it possible to block or redirect requests for
591 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
592 * Make pthread mutex locking more generic. Instead of
593 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
594 * and use mutex locking unless there is an _r function
595 * available. Better safe than sorry.
597 * Fixes "./configure --disable-pthread" and should result
598 * in less threading-related problems on pthread-using platforms,
599 * but it still doesn't fix BR#1122404.
601 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
602 * Move pthread.h inclusion from jcc.c to jcc.h.
603 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
605 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
606 * Don't exit after receiving the second SIGHUP on Solaris.
608 * Fixes BR 1052235, but the same problem may exist on other
609 * systems. Once 3.0.6 is out we should use sigset()
610 * where available and see if it breaks anything.
612 * Revision 1.104 2006/09/23 13:26:38 roro
613 * Replace TABs by spaces in source code.
615 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
616 * Fix +redirect{}. Didn't work with -fast-redirects.
618 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
619 * Respond with 400 and a short text message
620 * if the client tries to use Privoxy as FTP proxy.
622 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
623 * Make number of retries in case of forwarded-connect problems
624 * a config file option (forwarded-connect-retries) and use 0 as
627 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
628 * Set random(3) seed.
630 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
631 * Follow the OpenBSD port's lead and protect the resolve
632 * functions on OpenBSD as well.
634 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
635 * --user fix. Only use the user as group if no group is specified.
636 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
638 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
639 * Windows service (re-)integration
643 * --install[:service_name]
644 * --uninstall[:service_name]
647 * They work as follows:
648 * --install will create a service for you and then terminate.
649 * By default the service name will be "privoxy" (without the quotes).
650 * However you can run multiple services if you wish, just by adding
651 * a colon and then a name (no spaces).
653 * --uninstall follows the exact same rules a --install.
655 * --service is used when the program is executed by the service
656 * control manager, and in normal circumstances would never be
657 * used as a command line argument.
659 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
660 * Windows service integration
662 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
663 * Incorporate Fabian Keil's patch work:
664 http://www.fabiankeil.de/sourcecode/privoxy/
666 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
667 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
668 * with what was really the latest development (the v_3_0_branch branch)
670 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
671 * Thanks to Jindrich Makovicka for a race condition fix for the log
672 * file. The race condition remains for non-pthread implementations.
673 * Reference patch #1175720.
675 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
676 * Add the ability to check jpeg images for invalid
677 * lengths of comment blocks. Defensive strategy
678 * against the exploit:
679 * Microsoft Security Bulletin MS04-028
680 * Buffer Overrun in JPEG Processing (GDI+) Could
681 * Allow Code Execution (833987)
682 * Enabled with +inspect-jpegs in actions files.
684 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
685 * - Fixed usage info for non-unix platforms
686 * - Fixed small cmdline parsing bug
688 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
689 * Diagnostics: Now preserve the returncode of pthread_create
690 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
692 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
693 * No longer ignore SIGCHLD. Fixes bug #769381
695 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
696 * Close jarfile on graceful exit, remove stray line
698 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
699 * Cosmetics: Killed a warning, a typo and an allocation left at exit
701 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
702 * No longer rely on non-POSIX.1 extensions of getcwd().
705 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
706 * Replaced setenv() by posix-compliant putenv()
707 * Thanks to Neil McCalden (nmcc AT users.sf.net).
709 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
710 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
712 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
713 * Clean-up and extension of improvements for forked mode:
714 * - Child's return code now consists of flags RC_FLAG_*
715 * - Reporting toggle to parent now properly #ifdef'ed
716 * - Children now report blocking to parent. This enables
717 * statistics in forked mode
719 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
720 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
721 * Children now report having been toggled through _exit(17), parents
722 * watch for that code and toggle themselves if found.
724 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
725 * Wrapping all *_r functions (the non-_r versions of them) with
726 * mutex semaphores for OSX. Hopefully this will take care of all
727 * of those pesky crash reports.
729 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
730 * Fixed two mostly harmless mem leaks
732 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
733 * Fix: Head of global clients list now initialized to NULL
735 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
736 * Added basic support for OPTIONS and TRACE HTTP methods:
737 * - New interceptor direct_response() added in chat().
738 * - sed() moved to earlier in the process, so that the
739 * Host: header is evaluated before actions and forwarding
742 * Revision 1.92 2002/05/08 16:00:46 oes
743 * Chat's buffer handling:
744 * - Fixed bug with unchecked out-of-mem conditions
745 * while reading client request & server headers
746 * - No longer predict if the buffer limit will be exceeded
747 * in the next read -- check add_to_iob's new
748 * return code. If buffer couldn't be extended
749 * (policy or out-of-mem) while
750 * - reading from client: abort
751 * - reading server headers: send error page
752 * - buffering server body for filter: flush,
753 * and if that fails: send error page
755 * Revision 1.91 2002/04/08 20:35:58 swa
758 * Revision 1.90 2002/04/02 14:57:28 oes
759 * Made sending wafers independent of FEATURE_COOKIE_JAR
761 * Revision 1.89 2002/03/31 17:18:59 jongfoster
762 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
764 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
765 * More compiler warning message maintenance
767 * Revision 1.87 2002/03/26 22:29:54 swa
768 * we have a new homepage!
770 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
771 * Workaround for closing the jarfile before load_config() comes around again
773 * Revision 1.85 2002/03/24 15:23:33 jongfoster
776 * Revision 1.84 2002/03/24 13:25:43 swa
777 * name change related issues
779 * Revision 1.83 2002/03/16 23:54:06 jongfoster
780 * Adding graceful termination feature, to help look for memory leaks.
781 * If you enable this (which, by design, has to be done by hand
782 * editing config.h) and then go to http://i.j.b/die, then the program
783 * will exit cleanly after the *next* request. It should free all the
784 * memory that was used.
786 * Revision 1.82 2002/03/13 00:27:05 jongfoster
789 * Revision 1.81 2002/03/12 01:42:50 oes
790 * Introduced modular filters
792 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
793 * OS/2 port maintenance:
794 * - Fixed EMX build - it had decayed a little
795 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
796 * substituted a memset for now.
798 * Revision 1.79 2002/03/09 20:03:52 jongfoster
799 * - Making various functions return int rather than size_t.
800 * (Undoing a recent change). Since size_t is unsigned on
801 * Windows, functions like read_socket that return -1 on
802 * error cannot return a size_t.
804 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
805 * crashes, and also frequently caused JB to jump to 100%
806 * CPU and stay there. (Because it thought it had just
807 * read ((unsigned)-1) == 4Gb of data...)
809 * - The signature of write_socket has changed, it now simply
810 * returns success=0/failure=nonzero.
812 * - Trying to get rid of a few warnings --with-debug on
813 * Windows, I've introduced a new type "jb_socket". This is
814 * used for the socket file descriptors. On Windows, this
815 * is SOCKET (a typedef for unsigned). Everywhere else, it's
816 * an int. The error value can't be -1 any more, so it's
817 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
818 * Windows it maps to the #define INVALID_SOCKET.)
820 * - The signature of bind_port has changed.
822 * Revision 1.78 2002/03/08 21:35:04 oes
823 * Added optional group supplement to --user option. Will now use default group of user if no group given
825 * Revision 1.77 2002/03/07 03:52:06 oes
826 * - Fixed compiler warnings etc
827 * - Improved handling of failed DNS lookups
829 * Revision 1.76 2002/03/06 22:54:35 jongfoster
830 * Automated function-comment nitpicking.
832 * Revision 1.75 2002/03/06 10:02:19 oes
833 * Fixed stupid bug when --user was not given
835 * Revision 1.74 2002/03/06 00:49:31 jongfoster
836 * Fixing warning on Windows
837 * Making #ifdefs that refer to the same variable consistently
838 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
840 * Revision 1.73 2002/03/05 23:57:30 hal9
841 * Stray character 's' on line 1618 was breaking build.
843 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
844 * - Re-enable OS/2 building after new parms were added
845 * - Fix false out of memory report when resolving CGI templates when no IP
846 * address is available of failed attempt (a la no such domain)
848 * Revision 1.71 2002/03/05 18:13:56 oes
849 * Added --user option
851 * Revision 1.70 2002/03/05 04:52:42 oes
852 * Deleted non-errlog debugging code
854 * Revision 1.69 2002/03/04 23:50:00 jongfoster
855 * Splitting off bind_port() call into bind_port_helper(), with
858 * Revision 1.68 2002/03/04 20:17:32 oes
861 * Revision 1.67 2002/03/04 18:18:57 oes
862 * - Removed _DEBUG mode
863 * - Cleand up cmdline parsing
864 * - Introduced --no-daemon, --pidfile options
865 * - Cleaned up signal handling:
866 * - Terminate cleanly on INT, TERM and ABRT
867 * - Schedule logfile for re-opening on HUP
868 * - Ignore CHLD and PIPE
869 * - Leave the rest with their default handlers
870 * - Uniform handler registration
871 * - Added usage() function
872 * - Played styleguide police
874 * Revision 1.66 2002/03/03 15:06:55 oes
875 * Re-enabled automatic config reloading
877 * Revision 1.65 2002/03/03 14:49:11 oes
878 * Fixed CLF logging: Now uses client's original HTTP request
880 * Revision 1.64 2002/03/03 09:18:03 joergs
881 * Made jumbjuster work on AmigaOS again.
883 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
884 * Clean up a little CRLF unpleasantness that suddenly appeared
886 * Revision 1.62 2002/02/20 23:17:23 jongfoster
887 * Detecting some out-of memory conditions and exiting with a log message.
889 * Revision 1.61 2002/01/17 21:01:52 jongfoster
890 * Moving all our URL and URL pattern parsing code to urlmatch.c.
892 * Revision 1.60 2001/12/30 14:07:32 steudten
893 * - Add signal handling (unix)
894 * - Add SIGHUP handler (unix)
895 * - Add creation of pidfile (unix)
896 * - Add action 'top' in rc file (RH)
897 * - Add entry 'SIGNALS' to manpage
898 * - Add exit message to logfile (unix)
900 * Revision 1.59 2001/12/13 14:07:18 oes
901 * Fixed Bug: 503 error page now sent OK
903 * Revision 1.58 2001/11/30 23:37:24 jongfoster
904 * Renaming the Win32 config file to config.txt - this is almost the
905 * same as the corresponding UNIX name "config"
907 * Revision 1.57 2001/11/16 00:47:43 jongfoster
908 * Changing the tty-disconnection code to use setsid().
910 * Revision 1.56 2001/11/13 20:20:54 jongfoster
911 * Tabs->spaces, fixing a bug with missing {} around an if()
913 * Revision 1.55 2001/11/13 20:14:53 jongfoster
914 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
916 * Revision 1.54 2001/11/07 00:03:14 steudten
917 * Give reliable return value if an error
918 * occurs not just 0 with new daemon mode.
920 * Revision 1.53 2001/11/05 21:41:43 steudten
921 * Add changes to be a real daemon just for unix os.
922 * (change cwd to /, detach from controlling tty, set
923 * process group and session leader to the own process.
925 * Add some fatal-error log message for failed malloc().
926 * Add '-d' if compiled with 'configure --with-debug' to
927 * enable debug output.
929 * Revision 1.52 2001/10/26 20:11:20 jongfoster
930 * Fixing type mismatch
932 * Revision 1.51 2001/10/26 17:38:28 oes
935 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
936 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
937 * threads to call select() simultaneously. So, it's time to do a real, live,
938 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
939 * (native). Both versions will work, but using __OS2__ offers multi-threading.
941 * Revision 1.49 2001/10/23 21:41:35 jongfoster
942 * Added call to initialize the (statically-allocated of course)
943 * "out of memory" CGI response.
945 * Revision 1.48 2001/10/10 19:56:46 jongfoster
946 * Moving some code that wasn't cookie-related out of an #ifdef
949 * Revision 1.47 2001/10/10 16:44:36 oes
950 * Added CONNECT destination port limitation check
952 * Revision 1.46 2001/10/08 15:17:41 oes
953 * Re-enabled SSL forwarding
955 * Revision 1.45 2001/10/07 15:42:11 oes
956 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
958 * Moved downgrading of the HTTP version from parse_http_request to
959 * chat(), since we can't decide if it is necessary before we have
960 * determined the actions for the URL. The HTTP command is now
961 * *always* re-built so the repairs need no longer be special-cased.
963 * filter_popups now gets a csp pointer so it can raise the new
964 * CSP_FLAG_MODIFIED flag.
968 * Added configurable size limit for the IOB. If the IOB grows so
969 * large that the next read would exceed the limit, the header
970 * is generated, and the header & unfiltered buffer are flushed
971 * to the client. Chat then continues in non-buffering,
972 * non-filtering body mode.
974 * Revision 1.44 2001/10/02 18:13:57 oes
977 * Revision 1.43 2001/10/02 15:32:13 oes
978 * Moved generation of hdr
980 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
981 * Cleaning up 2 compiler warnings on OS/2.
983 * Revision 1.41 2001/09/16 17:05:14 jongfoster
984 * Removing unused #include showarg.h
986 * Revision 1.40 2001/09/16 15:41:45 jongfoster
987 * Fixing signed/unsigned comparison warning.
989 * Revision 1.39 2001/09/16 13:21:27 jongfoster
990 * Changes to use new list functions.
992 * Revision 1.38 2001/09/16 13:01:46 jongfoster
993 * Removing redundant function call that zeroed zalloc()'d memory.
995 * Revision 1.37 2001/09/10 11:12:24 oes
996 * Deleted unused variable
998 * Revision 1.36 2001/09/10 10:56:15 oes
999 * Silenced compiler warnings
1001 * Revision 1.35 2001/07/31 14:44:22 oes
1002 * Deleted unused size parameter from filter_popups()
1004 * Revision 1.34 2001/07/30 22:08:36 jongfoster
1005 * Tidying up #defines:
1006 * - All feature #defines are now of the form FEATURE_xxx
1007 * - Permanently turned off WIN_GUI_EDIT
1008 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
1010 * Revision 1.33 2001/07/29 19:32:00 jongfoster
1011 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
1013 * Revision 1.32 2001/07/29 18:47:05 jongfoster
1014 * Adding missing #include "loadcfg.h"
1016 * Revision 1.31 2001/07/29 12:17:48 oes
1017 * Applied pthread fix by Paul Lieverse
1019 * Revision 1.30 2001/07/25 22:57:13 jongfoster
1020 * __BEOS__ no longer overrides FEATURE_PTHREAD.
1021 * This is because FEATURE_PTHREAD will soon be widely used, so I
1022 * want to keep it simple.
1024 * Revision 1.29 2001/07/24 12:47:06 oes
1025 * Applied BeOS support update by Eugenia
1027 * Revision 1.28 2001/07/23 13:26:12 oes
1028 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
1030 * Revision 1.27 2001/07/19 19:09:47 haroon
1031 * - Added code to take care of the situation where while processing the first
1032 * server response (which includes the server header), after finding the end
1033 * of the headers we were not looking past the end of the headers for
1034 * content modification. I enabled it for filter_popups.
1035 * Someone else should look to see if other similar operations should be
1036 * done to the discarded portion of the buffer.
1038 * Note 2001/07/20: No, the other content modification mechanisms will process
1039 * the whole iob later anyway. --oes
1041 * Revision 1.26 2001/07/18 12:31:36 oes
1044 * Revision 1.25 2001/07/15 19:43:49 jongfoster
1045 * Supports POSIX threads.
1046 * Also removed some unused #includes.
1048 * Revision 1.24 2001/07/13 14:00:40 oes
1049 * - Generic content modification scheme:
1050 * Each feature has its own applicability flag that is set
1051 * from csp->action->flags.
1052 * Replaced the "filtering" int flag , by a function pointer
1053 * "content_filter" to the function that will do the content
1054 * modification. If it is != NULL, the document will be buffered
1055 * and processed through *content_filter, which must set
1056 * csp->content_length and return a modified copy of the body
1057 * or return NULL (on failiure).
1058 * - Changed csp->is_text to the more generic bitmap csp->content_type
1059 * which can currently take the valued CT_TEXT or CT_GIF
1060 * - Reformatting etc
1061 * - Removed all #ifdef PCRS
1063 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
1064 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
1065 * the `block_acl' call. This prevents a compilation error when the user
1066 * does not wish to use the "ACL" feature.
1068 * Revision 1.22 2001/06/29 21:45:41 oes
1069 * Indentation, CRLF->LF, Tab-> Space
1071 * Revision 1.21 2001/06/29 13:29:36 oes
1072 * - Cleaned up, improved comments
1073 * - Unified all possible interceptors (CGI,
1074 * block, trust, fast_redirect) in one
1075 * place, with one (CGI) answer generation
1076 * mechansim. Much clearer now.
1077 * - Removed the GIF image generation, which
1078 * is now done in filters.c:block_url()
1079 * - Made error conditions like domain lookup
1080 * failiure or (various) problems while talking
1081 * to the server use cgi.c:error_response()
1082 * instead of generating HTML/HTTP in chat() (yuck!)
1083 * - Removed logentry from cancelled commit
1085 * Revision 1.20 2001/06/09 10:55:28 jongfoster
1086 * Changing BUFSIZ ==> BUFFER_SIZE
1088 * Revision 1.19 2001/06/07 23:12:52 jongfoster
1089 * Replacing function pointer in struct gateway with a directly
1090 * called function forwarded_connect().
1091 * Replacing struct gateway with struct forward_spec
1093 * Revision 1.18 2001/06/03 19:12:16 oes
1094 * introduced new cgi handling
1096 * Revision 1.17 2001/06/01 20:07:23 jongfoster
1097 * Now uses action +image-blocker{} rather than config->tinygif
1099 * Revision 1.16 2001/06/01 18:49:17 jongfoster
1100 * Replaced "list_share" with "list" - the tiny memory gain was not
1101 * worth the extra complexity.
1103 * Revision 1.15 2001/05/31 21:24:47 jongfoster
1104 * Changed "permission" to "action" throughout.
1105 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
1106 * Moved vanilla wafer check into chat(), since we must now
1107 * decide whether or not to add it based on the URL.
1109 * Revision 1.14 2001/05/29 20:14:01 joergs
1110 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
1113 * Revision 1.13 2001/05/29 09:50:24 jongfoster
1114 * Unified blocklist/imagelist/permissionslist.
1115 * File format is still under discussion, but the internal changes
1116 * are (mostly) done.
1118 * Also modified interceptor behaviour:
1119 * - We now intercept all URLs beginning with one of the following
1120 * prefixes (and *only* these prefixes):
1122 * * http://ijbswa.sf.net/config/
1123 * * http://ijbswa.sourceforge.net/config/
1124 * - New interceptors "home page" - go to http://i.j.b/ to see it.
1125 * - Internal changes so that intercepted and fast redirect pages
1126 * are not replaced with an image.
1127 * - Interceptors now have the option to send a binary page direct
1128 * to the client. (i.e. ijb-send-banner uses this)
1129 * - Implemented show-url-info interceptor. (Which is why I needed
1130 * the above interceptors changes - a typical URL is
1131 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
1132 * The previous mechanism would not have intercepted that, and
1133 * if it had been intercepted then it then it would have replaced
1134 * it with an image.)
1136 * Revision 1.12 2001/05/27 22:17:04 oes
1138 * - re_process_buffer no longer writes the modified buffer
1139 * to the client, which was very ugly. It now returns the
1140 * buffer, which it is then written by chat.
1142 * - content_length now adjusts the Content-Length: header
1143 * for modified documents rather than crunch()ing it.
1144 * (Length info in csp->content_length, which is 0 for
1145 * unmodified documents)
1147 * - For this to work, sed() is called twice when filtering.
1149 * Revision 1.11 2001/05/26 17:27:53 jongfoster
1150 * Added support for CLF and fixed LOG_LEVEL_LOG.
1151 * Also did CRLF->LF fix of my previous patch.
1153 * Revision 1.10 2001/05/26 15:26:15 jongfoster
1154 * ACL feature now provides more security by immediately dropping
1155 * connections from untrusted hosts.
1157 * Revision 1.9 2001/05/26 00:28:36 jongfoster
1158 * Automatic reloading of config file.
1159 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
1160 * Most of the global variables have been moved to a new
1161 * struct configuration_spec, accessed through csp->config->globalname
1162 * Most of the globals remaining are used by the Win32 GUI.
1164 * Revision 1.8 2001/05/25 22:43:18 jongfoster
1165 * Fixing minor memory leak and buffer overflow.
1167 * Revision 1.7 2001/05/25 22:34:30 jongfoster
1170 * Revision 1.6 2001/05/23 00:13:58 joergs
1171 * AmigaOS support fixed.
1173 * Revision 1.5 2001/05/22 18:46:04 oes
1175 * - Enabled filtering banners by size rather than URL
1176 * by adding patterns that replace all standard banner
1177 * sizes with the "Junkbuster" gif to the re_filterfile
1179 * - Enabled filtering WebBugs by providing a pattern
1180 * which kills all 1x1 images
1182 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
1183 * which is selected by the (nonstandard and therefore
1184 * capital) letter 'U' in the option string.
1185 * It causes the quantifiers to be ungreedy by default.
1186 * Appending a ? turns back to greedy (!).
1188 * - Added a new interceptor ijb-send-banner, which
1189 * sends back the "Junkbuster" gif. Without imagelist or
1190 * MSIE detection support, or if tinygif = 1, or the
1191 * URL isn't recognized as an imageurl, a lame HTML
1192 * explanation is sent instead.
1194 * - Added new feature, which permits blocking remote
1195 * script redirects and firing back a local redirect
1197 * The feature is conditionally compiled, i.e. it
1198 * can be disabled with --disable-fast-redirects,
1199 * plus it must be activated by a "fast-redirects"
1200 * line in the config file, has its own log level
1201 * and of course wants to be displayed by show-proxy-args
1202 * Note: Boy, all the #ifdefs in 1001 locations and
1203 * all the fumbling with configure.in and acconfig.h
1204 * were *way* more work than the feature itself :-(
1206 * - Because a generic redirect template was needed for
1207 * this, tinygif = 3 now uses the same.
1209 * - Moved GIFs, and other static HTTP response templates
1212 * - Some minor fixes
1214 * - Removed some >400 CRs again (Jon, you really worked
1217 * Revision 1.4 2001/05/21 19:34:01 jongfoster
1218 * Made failure to bind() a fatal error.
1220 * Revision 1.3 2001/05/20 01:21:20 jongfoster
1221 * Version 2.9.4 checkin.
1222 * - Merged popupfile and cookiefile, and added control over PCRS
1223 * filtering, in new "permissionsfile".
1224 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
1225 * file error you now get a message box (in the Win32 GUI) rather
1226 * than the program exiting with no explanation.
1227 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
1229 * - Removed tabs from "config"
1230 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
1231 * - Bumped up version number.
1233 * Revision 1.2 2001/05/17 22:34:44 oes
1234 * - Added hint on GIF char array generation to jcc.c
1235 * - Cleaned CRLF's from the sources and related files
1236 * - Repaired logging for REF and FRC
1238 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
1239 * Initial import of version 2.9.3 source tree
1242 *********************************************************************/
1248 #include <sys/types.h>
1257 # ifndef FEATURE_PTHREAD
1261 # include <windows.h>
1262 # include <process.h>
1263 # endif /* ndef FEATURE_PTHREAD */
1266 # ifndef _WIN_CONSOLE
1267 # include "w32log.h"
1268 # endif /* ndef _WIN_CONSOLE */
1269 # include "w32svrapi.h"
1271 #else /* ifndef _WIN32 */
1273 # if !defined (__OS2__)
1274 # include <unistd.h>
1275 # include <sys/wait.h>
1276 # endif /* ndef __OS2__ */
1277 # include <sys/time.h>
1278 # include <sys/stat.h>
1279 # include <sys/ioctl.h>
1282 #include <sys/termios.h>
1290 # include <signal.h>
1293 # include <socket.h> /* BeOS has select() for sockets only. */
1294 # include <OS.h> /* declarations for threads and stuff. */
1297 # if defined(__EMX__) || defined(__OS2__)
1298 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1303 #define bzero(B,N) memset(B,0x00,n)
1307 # include <select.h>
1312 #include "project.h"
1315 #include "filters.h"
1316 #include "loaders.h"
1317 #include "parsers.h"
1318 #include "miscutil.h"
1320 #include "jbsockets.h"
1321 #include "gateway.h"
1322 #include "actions.h"
1324 #include "loadcfg.h"
1325 #include "urlmatch.h"
1327 const char jcc_h_rcs[] = JCC_H_VERSION;
1328 const char project_h_rcs[] = PROJECT_H_VERSION;
1331 struct client_state clients[1];
1332 struct file_list files[1];
1334 #ifdef FEATURE_STATISTICS
1335 int urls_read = 0; /* total nr of urls read inc rejected */
1336 int urls_rejected = 0; /* total nr of urls rejected */
1337 #endif /* def FEATURE_STATISTICS */
1339 #ifdef FEATURE_GRACEFUL_TERMINATION
1340 int g_terminate = 0;
1343 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1344 static void sig_handler(int the_signal);
1346 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1347 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1348 static jb_err get_server_headers(struct client_state *csp);
1349 static const char *crunch_reason(const struct http_response *rsp);
1350 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
1351 static char *get_request_line(struct client_state *csp);
1352 static jb_err receive_client_request(struct client_state *csp);
1353 static jb_err parse_client_request(struct client_state *csp);
1354 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1355 static jb_err change_request_destination(struct client_state *csp);
1356 static void chat(struct client_state *csp);
1357 static void serve(struct client_state *csp);
1358 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1359 static void usage(const char *myname);
1361 static void initialize_mutexes(void);
1362 static jb_socket bind_port_helper(struct configuration_spec *config);
1363 static void listen_loop(void);
1366 void serve(struct client_state *csp);
1367 #else /* ifndef AMIGA */
1368 static void serve(struct client_state *csp);
1369 #endif /* def AMIGA */
1372 static int32 server_thread(void *data);
1373 #endif /* def __BEOS__ */
1376 #define sleep(N) Sleep(((N) * 1000))
1380 #define sleep(N) DosSleep(((N) * 100))
1383 #ifdef MUTEX_LOCKS_AVAILABLE
1385 * XXX: Does the locking stuff really belong in this file?
1387 privoxy_mutex_t log_mutex;
1388 privoxy_mutex_t log_init_mutex;
1389 privoxy_mutex_t connection_reuse_mutex;
1391 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1392 privoxy_mutex_t resolver_mutex;
1393 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1395 #ifndef HAVE_GMTIME_R
1396 privoxy_mutex_t gmtime_mutex;
1397 #endif /* ndef HAVE_GMTIME_R */
1399 #ifndef HAVE_LOCALTIME_R
1400 privoxy_mutex_t localtime_mutex;
1401 #endif /* ndef HAVE_GMTIME_R */
1404 privoxy_mutex_t rand_mutex;
1405 #endif /* ndef HAVE_RANDOM */
1407 #endif /* def MUTEX_LOCKS_AVAILABLE */
1410 const char *basedir = NULL;
1411 const char *pidfile = NULL;
1412 static int received_hup_signal = 0;
1413 #endif /* defined unix */
1415 /* HTTP snipplets. */
1416 static const char CSUCCEED[] =
1417 "HTTP/1.0 200 Connection established\r\n"
1418 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1420 static const char CHEADER[] =
1421 "HTTP/1.0 400 Invalid header received from client\r\n"
1422 "Proxy-Agent: Privoxy " VERSION "\r\n"
1423 "Content-Type: text/plain\r\n"
1424 "Connection: close\r\n\r\n"
1425 "Invalid header received from client.\r\n";
1427 static const char FTP_RESPONSE[] =
1428 "HTTP/1.0 400 Invalid request received from client\r\n"
1429 "Content-Type: text/plain\r\n"
1430 "Connection: close\r\n\r\n"
1431 "Invalid request. Privoxy doesn't support FTP.\r\n";
1433 static const char GOPHER_RESPONSE[] =
1434 "HTTP/1.0 400 Invalid request received from client\r\n"
1435 "Content-Type: text/plain\r\n"
1436 "Connection: close\r\n\r\n"
1437 "Invalid request. Privoxy doesn't support gopher.\r\n";
1439 /* XXX: should be a template */
1440 static const char MISSING_DESTINATION_RESPONSE[] =
1441 "HTTP/1.0 400 Bad request received from client\r\n"
1442 "Proxy-Agent: Privoxy " VERSION "\r\n"
1443 "Content-Type: text/plain\r\n"
1444 "Connection: close\r\n\r\n"
1445 "Bad request. Privoxy was unable to extract the destination.\r\n";
1447 /* XXX: should be a template */
1448 static const char NO_SERVER_DATA_RESPONSE[] =
1449 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1450 "Proxy-Agent: Privoxy " VERSION "\r\n"
1451 "Content-Type: text/plain\r\n"
1452 "Connection: close\r\n\r\n"
1453 "Empty server or forwarder response.\r\n"
1454 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1456 /* XXX: should be a template */
1457 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1458 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1459 "Proxy-Agent: Privoxy " VERSION "\r\n"
1460 "Content-Type: text/plain\r\n"
1461 "Connection: close\r\n\r\n"
1462 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1465 /* XXX: should be a template */
1466 static const char NULL_BYTE_RESPONSE[] =
1467 "HTTP/1.0 400 Bad request received from client\r\n"
1468 "Proxy-Agent: Privoxy " VERSION "\r\n"
1469 "Content-Type: text/plain\r\n"
1470 "Connection: close\r\n\r\n"
1471 "Bad request. Null byte(s) before end of request.\r\n";
1474 /* XXX: should be a template */
1475 static const char MESSED_UP_REQUEST_RESPONSE[] =
1476 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1477 "Proxy-Agent: Privoxy " VERSION "\r\n"
1478 "Content-Type: text/plain\r\n"
1479 "Connection: close\r\n\r\n"
1480 "Bad request. Messed up with header filters.\r\n";
1482 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
1483 "HTTP/1.0 503 Too many open connections\r\n"
1484 "Proxy-Agent: Privoxy " VERSION "\r\n"
1485 "Content-Type: text/plain\r\n"
1486 "Connection: close\r\n\r\n"
1487 "Maximum number of open connections reached.\r\n";
1489 /* XXX: should be a template */
1490 static const char CONNECTION_TIMEOUT_RESPONSE[] =
1491 "HTTP/1.0 504 Connection timeout\r\n"
1492 "Proxy-Agent: Privoxy " VERSION "\r\n"
1493 "Content-Type: text/plain\r\n"
1494 "Connection: close\r\n\r\n"
1495 "The connection timed out.\r\n";
1497 /* A function to crunch a response */
1498 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1500 /* Crunch function flags */
1501 #define CF_NO_FLAGS 0
1502 /* Cruncher applies to forced requests as well */
1503 #define CF_IGNORE_FORCE 1
1504 /* Crunched requests are counted for the block statistics */
1505 #define CF_COUNT_AS_REJECT 2
1507 /* A crunch function and its flags */
1510 const crunch_func_ptr cruncher;
1514 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1516 /* Complete list of cruncher functions */
1517 static const struct cruncher crunchers_all[] = {
1518 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1519 { block_url, CF_COUNT_AS_REJECT },
1520 #ifdef FEATURE_TRUST
1521 { trust_url, CF_COUNT_AS_REJECT },
1522 #endif /* def FEATURE_TRUST */
1523 { redirect_url, CF_NO_FLAGS },
1524 { dispatch_cgi, CF_IGNORE_FORCE},
1528 /* Light version, used after tags are applied */
1529 static const struct cruncher crunchers_light[] = {
1530 { block_url, CF_COUNT_AS_REJECT },
1531 { redirect_url, CF_NO_FLAGS },
1537 * XXX: Don't we really mean
1543 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1544 /*********************************************************************
1546 * Function : sig_handler
1548 * Description : Signal handler for different signals.
1549 * Exit gracefully on TERM and INT
1550 * or set a flag that will cause the errlog
1551 * to be reopened by the main thread on HUP.
1554 * 1 : the_signal = the signal cause this function to call
1558 *********************************************************************/
1559 static void sig_handler(int the_signal)
1565 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1577 received_hup_signal = 1;
1583 * We shouldn't be here, unless we catch signals
1584 * in main() that we can't handle here!
1586 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1594 /*********************************************************************
1596 * Function : client_protocol_is_unsupported
1598 * Description : Checks if the client used a known unsupported
1599 * protocol and deals with it by sending an error
1603 * 1 : csp = Current client state (buffers, headers, etc...)
1604 * 2 : req = the first request line send by the client
1606 * Returns : TRUE if an error response has been generated, or
1607 * FALSE if the request doesn't look invalid.
1609 *********************************************************************/
1610 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1613 * If it's a FTP or gopher request, we don't support it.
1615 * These checks are better than nothing, but they might
1616 * not work in all configurations and some clients might
1617 * have problems digesting the answer.
1619 * They should, however, never cause more problems than
1620 * Privoxy's old behaviour (returning the misleading HTML
1623 * "Could not resolve http://(ftp|gopher)://example.org").
1625 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1627 const char *response = NULL;
1628 const char *protocol = NULL;
1630 if (!strncmpic(req, "GET ftp://", 10))
1632 response = FTP_RESPONSE;
1637 response = GOPHER_RESPONSE;
1638 protocol = "GOPHER";
1640 log_error(LOG_LEVEL_ERROR,
1641 "%s tried to use Privoxy as %s proxy: %s",
1642 csp->ip_addr_str, protocol, req);
1643 log_error(LOG_LEVEL_CLF,
1644 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1646 write_socket(csp->cfd, response, strlen(response));
1655 /*********************************************************************
1657 * Function : get_request_destination_elsewhere
1659 * Description : If the client's request was redirected into
1660 * Privoxy without the client's knowledge,
1661 * the request line lacks the destination host.
1663 * This function tries to get it elsewhere,
1664 * provided accept-intercepted-requests is enabled.
1666 * "Elsewhere" currently only means "Host: header",
1667 * but in the future we may ask the redirecting
1668 * packet filter to look the destination up.
1670 * If the destination stays unknown, an error
1671 * response is send to the client and headers
1672 * are freed so that chat() can return directly.
1675 * 1 : csp = Current client state (buffers, headers, etc...)
1676 * 2 : headers = a header list
1678 * Returns : JB_ERR_OK if the destination is now known, or
1679 * JB_ERR_PARSE if it isn't.
1681 *********************************************************************/
1682 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1686 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1688 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1689 " Privoxy isn't configured to accept intercepted requests.",
1690 csp->ip_addr_str, csp->http->cmd);
1691 /* XXX: Use correct size */
1692 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1693 csp->ip_addr_str, csp->http->cmd);
1695 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1696 destroy_list(headers);
1698 return JB_ERR_PARSE;
1700 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1702 /* Split the domain we just got for pattern matching */
1703 init_domain_components(csp->http);
1709 /* We can't work without destination. Go spread the news.*/
1711 req = list_to_text(headers);
1713 /* XXX: Use correct size */
1714 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1715 csp->ip_addr_str, csp->http->cmd);
1716 log_error(LOG_LEVEL_ERROR,
1717 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1718 csp->ip_addr_str, csp->http->cmd, req);
1721 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1722 destroy_list(headers);
1724 return JB_ERR_PARSE;
1727 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1728 * to get the destination IP address, use it as host directly
1729 * or do a reverse DNS lookup first.
1734 /*********************************************************************
1736 * Function : get_server_headers
1738 * Description : Parses server headers in iob and fills them
1739 * into csp->headers so that they can later be
1743 * 1 : csp = Current client state (buffers, headers, etc...)
1745 * Returns : JB_ERR_OK if everything went fine, or
1746 * JB_ERR_PARSE if the headers were incomplete.
1748 *********************************************************************/
1749 static jb_err get_server_headers(struct client_state *csp)
1751 int continue_hack_in_da_house = 0;
1754 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1759 * continue hack in da house. Ignore the ending of
1760 * this head and continue enlisting header lines.
1761 * The reason is described below.
1763 enlist(csp->headers, "");
1764 continue_hack_in_da_house = 0;
1767 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1770 * It's a bodyless continue response, don't
1771 * stop header parsing after reaching its end.
1773 * As a result Privoxy will concatenate the
1774 * next response's head and parse and deliver
1775 * the headers as if they belonged to one request.
1777 * The client will separate them because of the
1778 * empty line between them.
1780 * XXX: What we're doing here is clearly against
1781 * the intended purpose of the continue header,
1782 * and under some conditions (HTTP/1.0 client request)
1783 * it's a standard violation.
1785 * Anyway, "sort of against the spec" is preferable
1786 * to "always getting confused by Continue responses"
1787 * (Privoxy's behaviour before this hack was added)
1789 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1790 continue_hack_in_da_house = 1;
1792 else if (*header == '\0')
1795 * If the header is empty, but the Continue hack
1796 * isn't active, we can assume that we reached the
1797 * end of the buffer before we hit the end of the
1800 * Inform the caller an let it decide how to handle it.
1802 return JB_ERR_PARSE;
1805 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1808 * XXX: Should we quit the request and return a
1809 * out of memory error page instead?
1811 log_error(LOG_LEVEL_ERROR,
1812 "Out of memory while enlisting server headers. %s lost.",
1822 /*********************************************************************
1824 * Function : crunch_reason
1826 * Description : Translates the crunch reason code into a string.
1829 * 1 : rsp = a http_response
1831 * Returns : A string with the crunch reason or an error description.
1833 *********************************************************************/
1834 static const char *crunch_reason(const struct http_response *rsp)
1836 char * reason = NULL;
1838 assert(rsp != NULL);
1841 return "Internal error while searching for crunch reason";
1844 switch (rsp->reason)
1846 case RSP_REASON_UNSUPPORTED:
1847 reason = "Unsupported HTTP feature";
1849 case RSP_REASON_BLOCKED:
1852 case RSP_REASON_UNTRUSTED:
1853 reason = "Untrusted";
1855 case RSP_REASON_REDIRECTED:
1856 reason = "Redirected";
1858 case RSP_REASON_CGI_CALL:
1859 reason = "CGI Call";
1861 case RSP_REASON_NO_SUCH_DOMAIN:
1862 reason = "DNS failure";
1864 case RSP_REASON_FORWARDING_FAILED:
1865 reason = "Forwarding failed";
1867 case RSP_REASON_CONNECT_FAILED:
1868 reason = "Connection failure";
1870 case RSP_REASON_OUT_OF_MEMORY:
1871 reason = "Out of memory (may mask other reasons)";
1874 reason = "No reason recorded";
1882 /*********************************************************************
1884 * Function : send_crunch_response
1886 * Description : Delivers already prepared response for
1887 * intercepted requests, logs the interception
1888 * and frees the response.
1891 * 1 : csp = Current client state (buffers, headers, etc...)
1892 * 1 : rsp = Fully prepared response. Will be freed on exit.
1894 * Returns : Nothing.
1896 *********************************************************************/
1897 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
1899 const struct http_request *http = csp->http;
1900 char status_code[4];
1902 assert(rsp != NULL);
1903 assert(rsp->head != NULL);
1908 * Not supposed to happen. If it does
1909 * anyway, treat it as an unknown error.
1911 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1912 /* return code doesn't matter */
1917 /* If rsp is still NULL, we have serious internal problems. */
1918 log_error(LOG_LEVEL_FATAL,
1919 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1923 * Extract the status code from the actual head
1924 * that was send to the client. It is the only
1925 * way to get it right for all requests, including
1926 * the fixed ones for out-of-memory problems.
1928 * A head starts like this: 'HTTP/1.1 200...'
1932 status_code[0] = rsp->head[9];
1933 status_code[1] = rsp->head[10];
1934 status_code[2] = rsp->head[11];
1935 status_code[3] = '\0';
1937 /* Write the answer to the client */
1938 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1939 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1941 /* There is nothing we can do about it. */
1942 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1945 /* Log that the request was crunched and why. */
1946 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
1947 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
1948 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1950 /* Clean up and return */
1951 if (cgi_error_memory() != rsp)
1953 free_http_response(rsp);
1960 /*********************************************************************
1962 * Function : request_contains_null_bytes
1964 * Description : Checks for NULL bytes in the request and sends
1965 * an error message to the client if any were found.
1967 * XXX: currently not used, see comment in chat().
1970 * 1 : csp = Current client state (buffers, headers, etc...)
1971 * 2 : buf = Data from the client's request to check.
1972 * 3 : len = The data length.
1974 * Returns : TRUE if the request contained one or more NULL bytes, or
1977 *********************************************************************/
1978 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1980 size_t c_len; /* Request lenght when treated as C string */
1982 c_len = strlen(buf);
1987 * Null byte(s) found. Log the request,
1988 * return an error response and hang up.
1990 size_t tmp_len = c_len;
1995 * Replace NULL byte(s) with '°' characters
1996 * so the request can be logged as string.
1997 * XXX: Is there a better replacement character?
2000 tmp_len += strlen(buf+tmp_len);
2001 } while (tmp_len < len);
2003 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
2004 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
2005 log_error(LOG_LEVEL_HEADER,
2006 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
2008 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
2010 /* XXX: Log correct size */
2011 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2021 /*********************************************************************
2023 * Function : crunch_response_triggered
2025 * Description : Checks if the request has to be crunched,
2026 * and delivers the crunch response if necessary.
2029 * 1 : csp = Current client state (buffers, headers, etc...)
2030 * 2 : crunchers = list of cruncher functions to run
2032 * Returns : TRUE if the request was answered with a crunch response
2035 *********************************************************************/
2036 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
2038 struct http_response *rsp = NULL;
2039 const struct cruncher *c;
2042 * If CGI request crunching is disabled,
2043 * check the CGI dispatcher out of order to
2044 * prevent unintentional blocks or redirects.
2046 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
2047 && (NULL != (rsp = dispatch_cgi(csp))))
2049 /* Deliver, log and free the interception response. */
2050 send_crunch_response(csp, rsp);
2054 for (c = crunchers; c->cruncher != NULL; c++)
2057 * Check the cruncher if either Privoxy is toggled
2058 * on and the request isn't forced, or if the cruncher
2059 * applies to forced requests as well.
2061 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
2062 !(csp->flags & CSP_FLAG_FORCED)) ||
2063 (c->flags & CF_IGNORE_FORCE))
2065 rsp = c->cruncher(csp);
2068 /* Deliver, log and free the interception response. */
2069 send_crunch_response(csp, rsp);
2070 #ifdef FEATURE_STATISTICS
2071 if (c->flags & CF_COUNT_AS_REJECT)
2073 csp->flags |= CSP_FLAG_REJECTED;
2075 #endif /* def FEATURE_STATISTICS */
2086 /*********************************************************************
2088 * Function : build_request_line
2090 * Description : Builds the HTTP request line.
2092 * If a HTTP forwarder is used it expects the whole URL,
2093 * web servers only get the path.
2096 * 1 : csp = Current client state (buffers, headers, etc...)
2097 * 2 : fwd = The forwarding spec used for the request
2098 * XXX: Should use http->fwd instead.
2099 * 3 : request_line = The old request line which will be replaced.
2101 * Returns : Nothing. Terminates in case of memory problems.
2103 *********************************************************************/
2104 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
2106 struct http_request *http = csp->http;
2108 assert(http->ssl == 0);
2111 * Downgrade http version from 1.1 to 1.0
2112 * if +downgrade action applies.
2114 if ( (csp->action->flags & ACTION_DOWNGRADE)
2115 && (!strcmpic(http->ver, "HTTP/1.1")))
2118 http->ver = strdup("HTTP/1.0");
2120 if (http->ver == NULL)
2122 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
2127 * Rebuild the request line.
2129 freez(*request_line);
2130 *request_line = strdup(http->gpc);
2131 string_append(request_line, " ");
2133 if (fwd->forward_host)
2135 string_append(request_line, http->url);
2139 string_append(request_line, http->path);
2141 string_append(request_line, " ");
2142 string_append(request_line, http->ver);
2144 if (*request_line == NULL)
2146 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
2148 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
2152 /*********************************************************************
2154 * Function : change_request_destination
2156 * Description : Parse a (rewritten) request line and regenerate
2157 * the http request data.
2160 * 1 : csp = Current client state (buffers, headers, etc...)
2162 * Returns : Forwards the parse_http_request() return code.
2163 * Terminates in case of memory problems.
2165 *********************************************************************/
2166 static jb_err change_request_destination(struct client_state *csp)
2168 struct http_request *http = csp->http;
2171 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
2172 free_http_request(http);
2173 err = parse_http_request(csp->headers->first->str, http);
2174 if (JB_ERR_OK != err)
2176 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2177 jb_err_to_string(err));
2181 /* XXX: ocmd is a misleading name */
2182 http->ocmd = strdup(http->cmd);
2183 if (http->ocmd == NULL)
2185 log_error(LOG_LEVEL_FATAL,
2186 "Out of memory copying rewritten HTTP request line");
2194 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2195 /*********************************************************************
2197 * Function : server_response_is_complete
2199 * Description : Determines whether we should stop reading
2200 * from the server socket.
2203 * 1 : csp = Current client state (buffers, headers, etc...)
2204 * 2 : content_length = Length of content received so far.
2206 * Returns : TRUE if the response is complete,
2209 *********************************************************************/
2210 static int server_response_is_complete(struct client_state *csp,
2211 unsigned long long content_length)
2213 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
2215 if (!strcmpic(csp->http->gpc, "HEAD"))
2218 * "HEAD" implies no body, we are thus expecting
2219 * no content. XXX: incomplete "list" of methods?
2221 csp->expected_content_length = 0;
2222 content_length_known = TRUE;
2225 if (csp->http->status == 304)
2228 * Expect no body. XXX: incomplete "list" of status codes?
2230 csp->expected_content_length = 0;
2231 content_length_known = TRUE;
2234 return (content_length_known && ((0 == csp->expected_content_length)
2235 || (csp->expected_content_length <= content_length)));
2239 /*********************************************************************
2241 * Function : wait_for_alive_connections
2243 * Description : Waits for alive connections to timeout.
2249 *********************************************************************/
2250 static void wait_for_alive_connections()
2252 int connections_alive = close_unusable_connections();
2254 while (0 < connections_alive)
2256 log_error(LOG_LEVEL_CONNECT,
2257 "Waiting for %d connections to timeout.",
2260 connections_alive = close_unusable_connections();
2263 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
2266 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2269 /*********************************************************************
2271 * Function : mark_server_socket_tainted
2273 * Description : Makes sure we don't reuse a server socket
2274 * (if we didn't read everything the server sent
2275 * us reusing the socket would lead to garbage).
2278 * 1 : csp = Current client state (buffers, headers, etc...)
2282 *********************************************************************/
2283 static void mark_server_socket_tainted(struct client_state *csp)
2285 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
2287 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
2288 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
2292 /*********************************************************************
2294 * Function : get_request_line
2296 * Description : Read the client request line.
2299 * 1 : csp = Current client state (buffers, headers, etc...)
2301 * Returns : Pointer to request line or NULL in case of errors.
2303 *********************************************************************/
2304 static char *get_request_line(struct client_state *csp)
2306 char buf[BUFFER_SIZE];
2307 char *request_line = NULL;
2310 memset(buf, 0, sizeof(buf));
2314 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2316 log_error(LOG_LEVEL_ERROR,
2317 "Stopped waiting for the request line.");
2318 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2319 strlen(CONNECTION_TIMEOUT_RESPONSE));
2323 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2325 if (len <= 0) return NULL;
2328 * If there is no memory left for buffering the
2329 * request, there is nothing we can do but hang up
2331 if (add_to_iob(csp, buf, len))
2336 request_line = get_header(csp->iob);
2338 } while ((NULL != request_line) && ('\0' == *request_line));
2340 return request_line;
2345 /*********************************************************************
2347 * Function : receive_client_request
2349 * Description : Read the client's request (more precisely the
2350 * client headers) and answer it if necessary.
2352 * Note that since we're not using select() we could get
2353 * blocked here if a client connected, then didn't say
2357 * 1 : csp = Current client state (buffers, headers, etc...)
2359 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
2361 *********************************************************************/
2362 static jb_err receive_client_request(struct client_state *csp)
2364 char buf[BUFFER_SIZE];
2367 struct http_request *http;
2371 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
2372 struct list header_list;
2373 struct list *headers = &header_list;
2377 memset(buf, 0, sizeof(buf));
2379 req = get_request_line(csp);
2382 return JB_ERR_PARSE;
2384 assert(*req != '\0');
2386 if (client_protocol_is_unsupported(csp, req))
2388 return JB_ERR_PARSE;
2391 #ifdef FEATURE_FORCE_LOAD
2393 * If this request contains the FORCE_PREFIX and blocks
2394 * aren't enforced, get rid of it and set the force flag.
2396 if (strstr(req, FORCE_PREFIX))
2398 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2400 log_error(LOG_LEVEL_FORCE,
2401 "Ignored force prefix in request: \"%s\".", req);
2405 strclean(req, FORCE_PREFIX);
2406 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2407 csp->flags |= CSP_FLAG_FORCED;
2410 #endif /* def FEATURE_FORCE_LOAD */
2412 err = parse_http_request(req, http);
2414 if (JB_ERR_OK != err)
2416 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2417 /* XXX: Use correct size */
2418 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2419 log_error(LOG_LEVEL_ERROR,
2420 "Couldn't parse request line received from %s: %s",
2421 csp->ip_addr_str, jb_err_to_string(err));
2423 free_http_request(http);
2424 return JB_ERR_PARSE;
2427 /* grab the rest of the client's headers */
2431 p = get_header(csp->iob);
2435 /* There are no additional headers to read. */
2442 * We didn't receive a complete header
2443 * line yet, get the rest of it.
2445 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2447 log_error(LOG_LEVEL_ERROR,
2448 "Stopped grabbing the client headers.");
2449 return JB_ERR_PARSE;
2452 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2455 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2456 destroy_list(headers);
2457 return JB_ERR_PARSE;
2460 if (add_to_iob(csp, buf, len))
2463 * If there is no memory left for buffering the
2464 * request, there is nothing we can do but hang up
2466 destroy_list(headers);
2467 return JB_ERR_MEMORY;
2473 * We were able to read a complete
2474 * header and can finaly enlist it.
2481 if (http->host == NULL)
2484 * If we still don't know the request destination,
2485 * the request is invalid or the client uses
2486 * Privoxy without its knowledge.
2488 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2491 * Our attempts to get the request destination
2492 * elsewhere failed or Privoxy is configured
2493 * to only accept proxy requests.
2495 * An error response has already been send
2496 * and we're done here.
2498 return JB_ERR_PARSE;
2503 * Determine the actions for this URL
2505 #ifdef FEATURE_TOGGLE
2506 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2508 /* Most compatible set of actions (i.e. none) */
2509 init_current_action(csp->action);
2512 #endif /* ndef FEATURE_TOGGLE */
2514 get_url_actions(csp, http);
2518 * Save a copy of the original request for logging
2520 http->ocmd = strdup(http->cmd);
2521 if (http->ocmd == NULL)
2523 log_error(LOG_LEVEL_FATAL,
2524 "Out of memory copying HTTP request line");
2526 enlist(csp->headers, http->cmd);
2528 /* Append the previously read headers */
2529 list_append_list_unique(csp->headers, headers);
2530 destroy_list(headers);
2537 /*********************************************************************
2539 * Function : parse_client_request
2541 * Description : Parses the client's request and decides what to do
2544 * Note that since we're not using select() we could get
2545 * blocked here if a client connected, then didn't say
2549 * 1 : csp = Current client state (buffers, headers, etc...)
2551 * Returns : JB_ERR_OK or JB_ERR_PARSE
2553 *********************************************************************/
2554 static jb_err parse_client_request(struct client_state *csp)
2556 struct http_request *http = csp->http;
2559 err = sed(csp, FILTER_CLIENT_HEADERS);
2560 if (JB_ERR_OK != err)
2562 /* XXX: Should be handled in sed(). */
2563 assert(err == JB_ERR_PARSE);
2564 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
2566 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2568 /* Check request line for rewrites. */
2569 if ((NULL == csp->headers->first->str)
2570 || (strcmp(http->cmd, csp->headers->first->str) &&
2571 (JB_ERR_OK != change_request_destination(csp))))
2574 * A header filter broke the request line - bail out.
2576 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2577 /* XXX: Use correct size */
2578 log_error(LOG_LEVEL_CLF,
2579 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2580 log_error(LOG_LEVEL_ERROR,
2581 "Invalid request line after applying header filters.");
2582 free_http_request(http);
2584 return JB_ERR_PARSE;
2592 /*********************************************************************
2596 * Description : Once a connection to the client has been accepted,
2597 * this function is called (via serve()) to handle the
2598 * main business of the communication. When this
2599 * function returns, the caller must close the client
2602 * FIXME: chat is nearly thousand lines long.
2606 * 1 : csp = Current client state (buffers, headers, etc...)
2608 * Returns : Nothing.
2610 *********************************************************************/
2611 static void chat(struct client_state *csp)
2613 char buf[BUFFER_SIZE];
2620 int ms_iis5_hack = 0;
2621 unsigned long long byte_count = 0;
2622 int forwarded_connect_retries = 0;
2623 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
2624 const struct forward_spec *fwd;
2625 struct http_request *http;
2626 long len = 0; /* for buffer sizes (and negative error codes) */
2628 /* Function that does the content filtering for the current request */
2629 filter_function_ptr content_filter = NULL;
2631 /* Skeleton for HTTP response, if we should intercept the request */
2632 struct http_response *rsp;
2633 struct timeval timeout;
2635 memset(buf, 0, sizeof(buf));
2639 if (receive_client_request(csp) != JB_ERR_OK)
2643 if (parse_client_request(csp) != JB_ERR_OK)
2648 /* decide how to route the HTTP request */
2649 fwd = forward_url(csp, http);
2652 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2653 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2658 * build the http request to send to the server
2659 * we have to do one of the following:
2661 * create = use the original HTTP request to create a new
2662 * HTTP request that has either the path component
2663 * without the http://domainspec (w/path) or the
2664 * full orininal URL (w/url)
2665 * Note that the path and/or the HTTP version may
2666 * have been altered by now.
2668 * connect = Open a socket to the host:port of the server
2669 * and short-circuit server and client socket.
2671 * pass = Pass the request unchanged if forwarding a CONNECT
2672 * request to a parent proxy. Note that we'll be sending
2673 * the CFAIL message ourselves if connecting to the parent
2674 * fails, but we won't send a CSUCCEED message if it works,
2675 * since that would result in a double message (ours and the
2676 * parent's). After sending the request to the parent, we simply
2679 * here's the matrix:
2682 * +--------+--------+
2684 * 0 | create | connect|
2686 * Forwarding +--------+--------+
2688 * 1 | create | pass |
2690 * +--------+--------+
2694 if (http->ssl && connect_port_is_forbidden(csp))
2696 const char *acceptable_connect_ports =
2697 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2698 assert(NULL != acceptable_connect_ports);
2699 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2700 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2701 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2702 csp->action->flags |= ACTION_BLOCK;
2708 freez(csp->headers->first->str);
2709 build_request_line(csp, fwd, &csp->headers->first->str);
2713 * We have a request. Check if one of the crunchers wants it.
2715 if (crunch_response_triggered(csp, crunchers_all))
2718 * Yes. The client got the crunch response
2719 * and we are done here after cleaning up.
2721 /* XXX: why list_remove_all()? */
2722 list_remove_all(csp->headers);
2727 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2729 if (fwd->forward_host)
2731 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2732 fwd->forward_host, fwd->forward_port, http->hostport);
2736 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2739 /* here we connect to the server, gateway, or the forwarder */
2741 while ((csp->sfd = forwarded_connect(fwd, http, csp))
2742 && (errno == EINVAL)
2743 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2745 log_error(LOG_LEVEL_ERROR,
2746 "failed request #%u to connect to %s. Trying again.",
2747 forwarded_connect_retries, http->hostport);
2750 if (csp->sfd == JB_INVALID_SOCKET)
2752 if (fwd->type != SOCKS_NONE)
2755 rsp = error_response(csp, "forwarding-failed", errno);
2757 else if (errno == EINVAL)
2759 rsp = error_response(csp, "no-such-domain", errno);
2763 rsp = error_response(csp, "connect-failed", errno);
2764 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2768 /* Write the answer to the client */
2771 send_crunch_response(csp, rsp);
2777 hdr = list_to_text(csp->headers);
2780 /* FIXME Should handle error properly */
2781 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2783 list_remove_all(csp->headers);
2785 if (fwd->forward_host || (http->ssl == 0))
2788 * Write the client's (modified) header to the server
2789 * (along with anything else that may be in the buffer)
2791 if (write_socket(csp->sfd, hdr, strlen(hdr))
2792 || (flush_socket(csp->sfd, csp->iob) < 0))
2794 log_error(LOG_LEVEL_CONNECT,
2795 "write header to: %s failed: %E", http->hostport);
2797 rsp = error_response(csp, "connect-failed", errno);
2800 send_crunch_response(csp, rsp);
2810 * We're running an SSL tunnel and we're not forwarding,
2811 * so just send the "connect succeeded" message to the
2812 * client, flush the rest, and get out of the way.
2814 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2822 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2824 /* we're finished with the client's header */
2827 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
2829 /* pass data between the client and server
2830 * until one or the other shuts down the connection.
2839 * FD_ZERO here seems to point to an errant macro which crashes.
2840 * So do this by hand for now...
2842 memset(&rfds,0x00,sizeof(fd_set));
2846 FD_SET(csp->cfd, &rfds);
2847 FD_SET(csp->sfd, &rfds);
2849 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2850 if ((csp->flags & CSP_FLAG_CHUNKED)
2851 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2852 && ((csp->iob->eod - csp->iob->cur) >= 5)
2853 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2855 log_error(LOG_LEVEL_CONNECT,
2856 "Looks like we read the last chunk together with "
2857 "the server headers. We better stop reading.");
2858 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2859 csp->expected_content_length = byte_count;
2860 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2862 if (server_body && server_response_is_complete(csp, byte_count))
2864 log_error(LOG_LEVEL_CONNECT,
2865 "Done reading from server. Expected content length: %llu. "
2866 "Actual content length: %llu. Most recently received: %d.",
2867 csp->expected_content_length, byte_count, len);
2870 * XXX: should not jump around,
2871 * chat() is complicated enough already.
2875 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2877 timeout.tv_sec = csp->config->socket_timeout;
2878 timeout.tv_usec = 0;
2879 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
2883 log_error(LOG_LEVEL_ERROR,
2884 "Didn't receive data in time: %s", http->url);
2885 if ((byte_count == 0) && (http->ssl == 0))
2887 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2888 strlen(CONNECTION_TIMEOUT_RESPONSE));
2890 mark_server_socket_tainted(csp);
2895 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2896 mark_server_socket_tainted(csp);
2901 * This is the body of the browser's request,
2902 * just read and write it.
2904 if (FD_ISSET(csp->cfd, &rfds))
2906 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2910 /* XXX: not sure if this is necessary. */
2911 mark_server_socket_tainted(csp);
2912 break; /* "game over, man" */
2915 if (write_socket(csp->sfd, buf, (size_t)len))
2917 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2918 mark_server_socket_tainted(csp);
2925 * The server wants to talk. It could be the header or the body.
2926 * If `hdr' is null, then it's the header otherwise it's the body.
2927 * FIXME: Does `hdr' really mean `host'? No.
2929 if (FD_ISSET(csp->sfd, &rfds))
2932 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2936 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2938 if (http->ssl && (fwd->forward_host == NULL))
2941 * Just hang up. We already confirmed the client's CONNECT
2942 * request with status code 200 and unencrypted content is
2943 * no longer welcome.
2945 log_error(LOG_LEVEL_ERROR,
2946 "CONNECT already confirmed. Unable to tell the client about the problem.");
2949 else if (byte_count)
2952 * Just hang up. We already transmitted the original headers
2953 * and parts of the original content and therefore missed the
2954 * chance to send an error message (without risking data corruption).
2956 * XXX: we could retry with a fancy range request here.
2958 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2959 "Unable to tell the client about the problem.");
2960 mark_server_socket_tainted(csp);
2964 rsp = error_response(csp, "connect-failed", errno);
2967 send_crunch_response(csp, rsp);
2973 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2974 if (csp->flags & CSP_FLAG_CHUNKED)
2976 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
2978 /* XXX: this is a temporary hack */
2979 log_error(LOG_LEVEL_CONNECT,
2980 "Looks like we reached the end of the last chunk. "
2981 "We better stop reading.");
2982 csp->expected_content_length = byte_count + (unsigned long long)len;
2983 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2987 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2990 * Add a trailing zero to let be able to use string operations.
2991 * XXX: do we still need this with filter_popups gone?
2996 * Normally, this would indicate that we've read
2997 * as much as the server has sent us and we can
2998 * close the client connection. However, Microsoft
2999 * in its wisdom has released IIS/5 with a bug that
3000 * prevents it from sending the trailing \r\n in
3001 * a 302 redirect header (and possibly other headers).
3002 * To work around this if we've haven't parsed
3003 * a full header we'll append a trailing \r\n
3004 * and see if this now generates a valid one.
3006 * This hack shouldn't have any impacts. If we've
3007 * already transmitted the header or if this is a
3008 * SSL connection, then we won't bother with this
3009 * hack. So we only work on partially received
3010 * headers. If we append a \r\n and this still
3011 * doesn't generate a valid header, then we won't
3012 * transmit anything to the client.
3017 if (server_body || http->ssl)
3020 * If we have been buffering up the document,
3021 * now is the time to apply content modification
3022 * and send the result to the client.
3026 p = execute_content_filter(csp, content_filter);
3028 * If the content filter fails, use the original
3029 * buffer and length.
3030 * (see p != NULL ? p : csp->iob->cur below)
3034 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3037 if (JB_ERR_OK != update_server_headers(csp))
3039 log_error(LOG_LEVEL_FATAL,
3040 "Failed to update server headers. after filtering.");
3043 hdr = list_to_text(csp->headers);
3046 /* FIXME Should handle error properly */
3047 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3050 if (write_socket(csp->cfd, hdr, strlen(hdr))
3051 || write_socket(csp->cfd,
3052 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
3054 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3057 mark_server_socket_tainted(csp);
3065 break; /* "game over, man" */
3069 * This is NOT the body, so
3070 * Let's pretend the server just sent us a blank line.
3072 snprintf(buf, sizeof(buf), "\r\n");
3073 len = (int)strlen(buf);
3076 * Now, let the normal header parsing algorithm below do its
3077 * job. If it fails, we'll exit instead of continuing.
3084 * If this is an SSL connection or we're in the body
3085 * of the server document, just write it to the client,
3086 * unless we need to buffer the body for later content-filtering
3088 if (server_body || http->ssl)
3093 * If there is no memory left for buffering the content, or the buffer limit
3094 * has been reached, switch to non-filtering mode, i.e. make & write the
3095 * header, flush the iob and buf, and get out of the way.
3097 if (add_to_iob(csp, buf, len))
3102 log_error(LOG_LEVEL_INFO,
3103 "Flushing header and buffers. Stepping back from filtering.");
3105 hdr = list_to_text(csp->headers);
3109 * Memory is too tight to even generate the header.
3110 * Send our static "Out-of-memory" page.
3112 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3113 rsp = cgi_error_memory();
3114 send_crunch_response(csp, rsp);
3115 mark_server_socket_tainted(csp);
3118 hdrlen = strlen(hdr);
3120 if (write_socket(csp->cfd, hdr, hdrlen)
3121 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
3122 || (write_socket(csp->cfd, buf, (size_t)len)))
3124 log_error(LOG_LEVEL_CONNECT,
3125 "Flush header and buffers to client failed: %E");
3127 mark_server_socket_tainted(csp);
3132 * Reset the byte_count to the amount of bytes
3133 * we just flushed. len will be added a few lines below,
3134 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3136 byte_count = (unsigned long long)flushed;
3138 content_filter = NULL;
3144 if (write_socket(csp->cfd, buf, (size_t)len))
3146 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3147 mark_server_socket_tainted(csp);
3151 byte_count += (unsigned long long)len;
3156 const char *header_start;
3158 * We're still looking for the end of the server's header.
3159 * Buffer up the data we just read. If that fails, there's
3160 * little we can do but send our static out-of-memory page.
3162 if (add_to_iob(csp, buf, len))
3164 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3165 rsp = cgi_error_memory();
3166 send_crunch_response(csp, rsp);
3167 mark_server_socket_tainted(csp);
3171 header_start = csp->iob->cur;
3173 /* Convert iob into something sed() can digest */
3174 if (JB_ERR_PARSE == get_server_headers(csp))
3179 * Well, we tried our MS IIS/5 hack and it didn't work.
3180 * The header is incomplete and there isn't anything
3181 * we can do about it.
3183 log_error(LOG_LEVEL_INFO,
3184 "MS IIS5 hack didn't produce valid headers.");
3190 * Since we have to wait for more from the server before
3191 * we can parse the headers we just continue here.
3193 long header_offset = csp->iob->cur - header_start;
3194 assert(csp->iob->cur >= header_start);
3195 byte_count += (unsigned long long)(len - header_offset);
3196 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
3197 "byte_count: %llu. header_offset: %d. len: %d.",
3198 byte_count, header_offset, len);
3203 /* Did we actually get anything? */
3204 if (NULL == csp->headers->first)
3206 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
3207 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3208 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
3209 free_http_request(http);
3210 mark_server_socket_tainted(csp);
3214 assert(csp->headers->first->str);
3216 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3217 strncmpic(csp->headers->first->str, "ICY", 3))
3220 * It doesn't look like a HTTP (or Shoutcast) response:
3221 * tell the client and log the problem.
3223 if (strlen(csp->headers->first->str) > 30)
3225 csp->headers->first->str[30] = '\0';
3227 log_error(LOG_LEVEL_ERROR,
3228 "Invalid server or forwarder response. Starts with: %s",
3229 csp->headers->first->str);
3230 log_error(LOG_LEVEL_CLF,
3231 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3232 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3233 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3234 free_http_request(http);
3235 mark_server_socket_tainted(csp);
3240 * We have now received the entire server header,
3241 * filter it and send the result to the client
3243 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3245 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
3247 hdr = list_to_text(csp->headers);
3250 /* FIXME Should handle error properly */
3251 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3254 if (crunch_response_triggered(csp, crunchers_light))
3257 * One of the tags created by a server-header
3258 * tagger triggered a crunch. We already
3259 * delivered the crunch response to the client
3260 * and are done here after cleaning up.
3263 mark_server_socket_tainted(csp);
3266 /* Buffer and pcrs filter this if appropriate. */
3268 if (!http->ssl) /* We talk plaintext */
3270 content_filter = get_filter_function(csp);
3273 * Only write if we're not buffering for content modification
3275 if (!content_filter)
3278 * Write the server's (modified) header to
3279 * the client (along with anything else that
3280 * may be in the buffer)
3283 if (write_socket(csp->cfd, hdr, strlen(hdr))
3284 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
3286 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
3289 * The write failed, so don't bother mentioning it
3290 * to the client... it probably can't hear us anyway.
3293 mark_server_socket_tainted(csp);
3297 byte_count += (unsigned long long)len;
3302 * XXX: the header lenght should probably
3303 * be calculated by get_server_headers().
3305 long header_length = csp->iob->cur - header_start;
3306 assert(csp->iob->cur > header_start);
3307 byte_count += (unsigned long long)(len - header_length);
3310 /* we're finished with the server's header */
3316 * If this was a MS IIS/5 hack then it means the server
3317 * has already closed the connection. Nothing more to read.
3322 log_error(LOG_LEVEL_INFO,
3323 "Closed server connection detected with MS IIS5 hack enabled.");
3329 mark_server_socket_tainted(csp);
3330 return; /* huh? we should never get here */
3333 if (csp->content_length == 0)
3336 * If Privoxy didn't recalculate the Content-Lenght,
3337 * byte_count is still correct.
3339 csp->content_length = byte_count;
3342 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3343 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3344 && (csp->expected_content_length != byte_count))
3346 log_error(LOG_LEVEL_CONNECT,
3347 "Received %llu bytes while expecting %llu.",
3348 byte_count, csp->expected_content_length);
3349 mark_server_socket_tainted(csp);
3353 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3354 csp->ip_addr_str, http->ocmd, csp->content_length);
3358 /*********************************************************************
3362 * Description : This is little more than chat. We only "serve" to
3363 * to close (or remember) any socket that chat may have
3367 * 1 : csp = Current client state (buffers, headers, etc...)
3371 *********************************************************************/
3373 void serve(struct client_state *csp)
3374 #else /* ifndef AMIGA */
3375 static void serve(struct client_state *csp)
3376 #endif /* def AMIGA */
3380 if (csp->sfd != JB_INVALID_SOCKET)
3382 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3383 static int monitor_thread_running = 0;
3385 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
3386 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
3388 remember_connection(csp->sfd, csp->http, forward_url(csp, csp->http));
3389 close_socket(csp->cfd);
3390 csp->cfd = JB_INVALID_SOCKET;
3391 privoxy_mutex_lock(&connection_reuse_mutex);
3392 if (!monitor_thread_running)
3394 monitor_thread_running = 1;
3395 privoxy_mutex_unlock(&connection_reuse_mutex);
3396 wait_for_alive_connections();
3397 privoxy_mutex_lock(&connection_reuse_mutex);
3398 monitor_thread_running = 0;
3400 privoxy_mutex_unlock(&connection_reuse_mutex);
3404 forget_connection(csp->sfd);
3405 close_socket(csp->sfd);
3408 close_socket(csp->sfd);
3409 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3412 if (csp->cfd != JB_INVALID_SOCKET)
3414 close_socket(csp->cfd);
3417 csp->flags &= ~CSP_FLAG_ACTIVE;
3423 /*********************************************************************
3425 * Function : server_thread
3427 * Description : We only exist to call `serve' in a threaded environment.
3430 * 1 : data = Current client state (buffers, headers, etc...)
3432 * Returns : Always 0.
3434 *********************************************************************/
3435 static int32 server_thread(void *data)
3437 serve((struct client_state *) data);
3444 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3445 /*********************************************************************
3449 * Description : Print usage info & exit.
3451 * Parameters : Pointer to argv[0] for identifying ourselves
3455 *********************************************************************/
3456 static void usage(const char *myname)
3458 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
3462 #endif /* defined(unix) */
3465 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
3466 #endif /* defined(unix) */
3467 "[--version] [configfile]\n"
3468 "Aborting\n", myname);
3473 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
3476 #ifdef MUTEX_LOCKS_AVAILABLE
3477 /*********************************************************************
3479 * Function : privoxy_mutex_lock
3481 * Description : Locks a mutex.
3484 * 1 : mutex = The mutex to lock.
3486 * Returns : Void. May exit in case of errors.
3488 *********************************************************************/
3489 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
3491 #ifdef FEATURE_PTHREAD
3492 int err = pthread_mutex_lock(mutex);
3495 if (mutex != &log_mutex)
3497 log_error(LOG_LEVEL_FATAL,
3498 "Mutex locking failed: %s.\n", strerror(err));
3503 EnterCriticalSection(mutex);
3504 #endif /* def FEATURE_PTHREAD */
3508 /*********************************************************************
3510 * Function : privoxy_mutex_unlock
3512 * Description : Unlocks a mutex.
3515 * 1 : mutex = The mutex to unlock.
3517 * Returns : Void. May exit in case of errors.
3519 *********************************************************************/
3520 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
3522 #ifdef FEATURE_PTHREAD
3523 int err = pthread_mutex_unlock(mutex);
3526 if (mutex != &log_mutex)
3528 log_error(LOG_LEVEL_FATAL,
3529 "Mutex unlocking failed: %s.\n", strerror(err));
3534 LeaveCriticalSection(mutex);
3535 #endif /* def FEATURE_PTHREAD */
3539 /*********************************************************************
3541 * Function : privoxy_mutex_init
3543 * Description : Prepares a mutex.
3546 * 1 : mutex = The mutex to initialize.
3548 * Returns : Void. May exit in case of errors.
3550 *********************************************************************/
3551 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
3553 #ifdef FEATURE_PTHREAD
3554 int err = pthread_mutex_init(mutex, 0);
3557 printf("Fatal error. Mutex initialization failed: %s.\n",
3562 InitializeCriticalSection(mutex);
3563 #endif /* def FEATURE_PTHREAD */
3565 #endif /* def MUTEX_LOCKS_AVAILABLE */
3567 /*********************************************************************
3569 * Function : initialize_mutexes
3571 * Description : Prepares mutexes if mutex support is available.
3575 * Returns : Void, exits in case of errors.
3577 *********************************************************************/
3578 static void initialize_mutexes(void)
3580 #ifdef MUTEX_LOCKS_AVAILABLE
3582 * Prepare global mutex semaphores
3584 privoxy_mutex_init(&log_mutex);
3585 privoxy_mutex_init(&log_init_mutex);
3586 privoxy_mutex_init(&connection_reuse_mutex);
3589 * XXX: The assumptions below are a bit naive
3590 * and can cause locks that aren't necessary.
3592 * For example older FreeBSD versions (< 6.x?)
3593 * have no gethostbyname_r, but gethostbyname is
3596 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
3597 privoxy_mutex_init(&resolver_mutex);
3598 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
3600 * XXX: should we use a single mutex for
3601 * localtime() and gmtime() as well?
3603 #ifndef HAVE_GMTIME_R
3604 privoxy_mutex_init(&gmtime_mutex);
3605 #endif /* ndef HAVE_GMTIME_R */
3607 #ifndef HAVE_LOCALTIME_R
3608 privoxy_mutex_init(&localtime_mutex);
3609 #endif /* ndef HAVE_GMTIME_R */
3612 privoxy_mutex_init(&rand_mutex);
3613 #endif /* ndef HAVE_RANDOM */
3614 #endif /* def MUTEX_LOCKS_AVAILABLE */
3618 /*********************************************************************
3622 * Description : Load the config file and start the listen loop.
3623 * This function is a lot more *sane* with the `load_config'
3624 * and `listen_loop' functions; although it stills does
3625 * a *little* too much for my taste.
3628 * 1 : argc = Number of parameters (including $0).
3629 * 2 : argv = Array of (char *)'s to the parameters.
3631 * Returns : 1 if : can't open config file, unrecognized directive,
3632 * stats requested in multi-thread mode, can't open the
3633 * log file, can't open the jar file, listen port is invalid,
3634 * any load fails, and can't bind port.
3636 * Else main never returns, the process must be signaled
3637 * to terminate execution. Or, on Windows, use the
3638 * "File", "Exit" menu option.
3640 *********************************************************************/
3642 int real_main(int argc, const char *argv[])
3644 int main(int argc, const char *argv[])
3648 unsigned int random_seed;
3650 struct passwd *pw = NULL;
3651 struct group *grp = NULL;
3654 char *pre_chroot_nslookup_to_load_resolver = NULL;
3661 #if !defined(_WIN32)
3668 /* Prepare mutexes if supported and necessary. */
3669 initialize_mutexes();
3671 /* Enable logging until further notice. */
3675 * Parse the command line arguments
3677 * XXX: simply printing usage information in case of
3678 * invalid arguments isn't particularly user friendly.
3680 while (++argc_pos < argc)
3683 /* Check to see if the service must be installed or uninstalled */
3684 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3686 const char *pName = argv[argc_pos] + 9;
3689 exit( (install_service(pName)) ? 0 : 1 );
3691 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3693 const char *pName = argv[argc_pos] + 11;
3696 exit((uninstall_service(pName)) ? 0 : 1);
3698 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3700 bRunAsService = TRUE;
3701 w32_set_service_cwd();
3702 atexit(w32_service_exit_notify);
3705 #endif /* defined(_WIN32) */
3708 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3710 if (strcmp(argv[argc_pos], "--help") == 0)
3715 else if(strcmp(argv[argc_pos], "--version") == 0)
3717 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3723 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3725 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
3729 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3731 if (++argc_pos == argc) usage(argv[0]);
3732 pidfile = strdup(argv[argc_pos]);
3735 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3737 if (++argc_pos == argc) usage(argv[argc_pos]);
3739 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3742 if (NULL == (grp = getgrnam(p)))
3744 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3748 if (NULL == (pw = getpwnam(argv[argc_pos])))
3750 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3753 if (p != NULL) *--p = '\0';
3756 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3758 if (++argc_pos == argc) usage(argv[0]);
3759 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3762 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3766 #endif /* defined(unix) */
3768 else if (argc_pos + 1 != argc)
3771 * This is neither the last command line
3772 * option, nor was it recognized before,
3773 * therefore it must be invalid.
3779 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3781 configfile = argv[argc_pos];
3784 } /* -END- while (more arguments) */
3786 show_version(Argv[0]);
3789 if ( *configfile != '/' )
3791 char cwd[BUFFER_SIZE];
3793 size_t abs_file_size;
3795 /* make config-filename absolute here */
3796 if (NULL == getcwd(cwd, sizeof(cwd)))
3798 perror("failed to get current working directory");
3803 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3804 basedir = strdup(cwd);
3806 if (NULL == basedir ||
3807 NULL == (abs_file = malloc(abs_file_size)))
3809 perror("malloc failed");
3812 strlcpy(abs_file, basedir, abs_file_size);
3813 strlcat(abs_file, "/", abs_file_size );
3814 strlcat(abs_file, configfile, abs_file_size);
3815 configfile = abs_file;
3817 #endif /* defined unix */
3821 clients->next = NULL;
3823 /* XXX: factor out initialising after the next stable release. */
3826 #elif defined(_WIN32)
3830 random_seed = (unsigned int)time(NULL);
3832 srandom(random_seed);
3835 #endif /* ifdef HAVE_RANDOM */
3838 * Unix signal handling
3840 * Catch the abort, interrupt and terminate signals for a graceful exit
3841 * Catch the hangup signal so the errlog can be reopened.
3842 * Ignore the broken pipe signals (FIXME: Why?)
3844 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3847 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3848 const int ignored_signals[] = { SIGPIPE, 0 };
3850 for (idx = 0; catched_signals[idx] != 0; idx++)
3852 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3853 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3855 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3856 #endif /* ifdef sun */
3858 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3862 for (idx = 0; ignored_signals[idx] != 0; idx++)
3864 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3866 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3871 #else /* ifdef _WIN32 */
3872 # ifdef _WIN_CONSOLE
3874 * We *are* in a windows console app.
3875 * Print a verbose messages about FAQ's and such
3877 printf("%s", win32_blurb);
3878 # endif /* def _WIN_CONSOLE */
3879 #endif /* def _WIN32 */
3882 /* Initialize the CGI subsystem */
3883 cgi_init_error_messages();
3886 * If runnig on unix and without the --nodaemon
3887 * option, become a daemon. I.e. fork, detach
3888 * from tty and get process group leadership
3901 if ( pid < 0 ) /* error */
3906 else if ( pid != 0 ) /* parent */
3911 * must check for errors
3912 * child died due to missing files aso
3915 wpid = waitpid( pid, &status, WNOHANG );
3924 /* Should be more portable, but not as well tested */
3929 #else /* ndef __FreeBSD__ */
3931 #endif /* ndef __FreeBSD__ */
3932 fd = open("/dev/tty", O_RDONLY);
3935 /* no error check here */
3936 ioctl( fd, TIOCNOTTY,0 );
3941 * stderr (fd 2) will be closed later on,
3942 * when the config file has been parsed.
3949 } /* -END- if (!no_daemon) */
3952 * As soon as we have written the PID file, we can switch
3953 * to the user and group ID indicated by the --user option
3959 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3961 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3965 if (setgroups(1, &grp->gr_gid))
3967 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
3970 else if (initgroups(pw->pw_name, pw->pw_gid))
3972 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
3978 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3980 /* Read the time zone file from /etc before doing chroot. */
3982 if (NULL != pre_chroot_nslookup_to_load_resolver
3983 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3985 /* Initialize resolver library. */
3986 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3988 if (chroot(pw->pw_dir) < 0)
3990 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3994 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3997 if (setuid(pw->pw_uid))
3999 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
4003 char putenv_dummy[64];
4005 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
4006 if (putenv(putenv_dummy) != 0)
4008 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
4011 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
4012 if (putenv(putenv_dummy) != 0)
4014 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
4020 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
4023 #endif /* defined unix */
4026 /* This will be FALSE unless the command line specified --service
4030 /* Yup, so now we must attempt to establish a connection
4031 * with the service dispatcher. This will only work if this
4032 * process was launched by the service control manager to
4033 * actually run as a service. If this isn't the case, i've
4034 * known it take around 30 seconds or so for the call to return.
4037 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
4038 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
4040 /* Service has run, and at this point is now being stopped, so just return */
4045 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
4047 /* An error occurred. Usually it's because --service was wrongly specified
4048 * and we were unable to connect to the Service Control Dispatcher because
4049 * it wasn't expecting us and is therefore not listening.
4051 * For now, just continue below to call the listen_loop function.
4054 #endif /* def _WIN32 */
4064 /*********************************************************************
4066 * Function : bind_port_helper
4068 * Description : Bind the listen port. Handles logging, and aborts
4072 * 1 : config = Privoxy configuration. Specifies port
4075 * Returns : Port that was opened.
4077 *********************************************************************/
4078 static jb_socket bind_port_helper(struct configuration_spec * config)
4083 if (config->haddr == NULL)
4085 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
4090 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
4091 config->hport, config->haddr);
4094 result = bind_port(config->haddr, config->hport, &bfd);
4101 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4102 "There may be another Privoxy or some other "
4103 "proxy running on port %d",
4104 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
4105 config->hport, config->hport);
4108 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4109 "The hostname is not resolvable",
4110 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4113 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
4114 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4117 /* shouldn't get here */
4118 return JB_INVALID_SOCKET;
4121 config->need_bind = 0;
4128 /* Without this simple workaround we get this compiler warning from _beginthread
4129 * warning C4028: formal parameter 1 different from declaration
4131 void w32_service_listen_loop(void *p)
4135 #endif /* def _WIN32 */
4138 /*********************************************************************
4140 * Function : listen_loop
4142 * Description : bind the listen port and enter a "FOREVER" listening loop.
4148 *********************************************************************/
4149 static void listen_loop(void)
4151 struct client_state *csp = NULL;
4153 struct configuration_spec * config;
4155 config = load_config();
4157 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4159 * XXX: Should be relocated once it no
4160 * longer needs to emit log messages.
4162 initialize_reusable_connections();
4163 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4165 bfd = bind_port_helper(config);
4167 #ifdef FEATURE_GRACEFUL_TERMINATION
4168 while (!g_terminate)
4173 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
4174 while (waitpid(-1, NULL, WNOHANG) > 0)
4176 /* zombie children */
4178 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
4181 * Free data that was used by died threads
4187 * Re-open the errlog after HUP signal
4189 if (received_hup_signal)
4191 if (NULL != config->logfile)
4193 init_error_log(Argv[0], config->logfile);
4195 received_hup_signal = 0;
4199 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
4201 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
4205 csp->flags |= CSP_FLAG_ACTIVE;
4206 csp->sfd = JB_INVALID_SOCKET;
4208 csp->config = config = load_config();
4210 if ( config->need_bind )
4213 * Since we were listening to the "old port", we will not see
4214 * a "listen" param change until the next IJB request. So, at
4215 * least 1 more request must be made for us to find the new
4216 * setting. I am simply closing the old socket and binding the
4219 * Which-ever is correct, we will serve 1 more page via the
4220 * old settings. This should probably be a "show-proxy-args"
4221 * request. This should not be a so common of an operation
4222 * that this will hurt people's feelings.
4227 bfd = bind_port_helper(config);
4230 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
4232 if (!accept_connection(csp, bfd))
4234 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
4247 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
4250 #ifdef FEATURE_TOGGLE
4251 if (global_toggle_state)
4252 #endif /* def FEATURE_TOGGLE */
4254 csp->flags |= CSP_FLAG_TOGGLED_ON;
4257 if (run_loader(csp))
4259 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
4260 /* Never get here - LOG_LEVEL_FATAL causes program exit */
4264 if (block_acl(NULL,csp))
4266 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
4267 close_socket(csp->cfd);
4271 #endif /* def FEATURE_ACL */
4273 /* add it to the list of clients */
4274 csp->next = clients->next;
4275 clients->next = csp;
4277 if (config->multi_threaded)
4281 /* this is a switch () statment in the C preprocessor - ugh */
4282 #undef SELECTED_ONE_OPTION
4284 /* Use Pthreads in preference to native code */
4285 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
4286 #define SELECTED_ONE_OPTION
4288 pthread_t the_thread;
4289 pthread_attr_t attrs;
4291 pthread_attr_init(&attrs);
4292 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
4293 errno = pthread_create(&the_thread, &attrs,
4294 (void * (*)(void *))serve, csp);
4295 child_id = errno ? -1 : 0;
4296 pthread_attr_destroy(&attrs);
4300 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
4301 #define SELECTED_ONE_OPTION
4302 child_id = _beginthread(
4303 (void (*)(void *))serve,
4308 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
4309 #define SELECTED_ONE_OPTION
4310 child_id = _beginthread(
4311 (void(* _Optlink)(void*))serve,
4317 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
4318 #define SELECTED_ONE_OPTION
4320 thread_id tid = spawn_thread
4321 (server_thread, "server", B_NORMAL_PRIORITY, csp);
4323 if ((tid >= 0) && (resume_thread(tid) == B_OK))
4325 child_id = (int) tid;
4334 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
4335 #define SELECTED_ONE_OPTION
4336 csp->cfd = ReleaseSocket(csp->cfd, -1);
4339 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4340 NP_Output, Output(),
4341 NP_CloseOutput, FALSE,
4342 NP_Name, (ULONG)"privoxy child",
4346 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4347 NP_Output, Output(),
4348 NP_CloseOutput, FALSE,
4349 NP_Name, (ULONG)"privoxy child",
4350 NP_StackSize, 200*1024,
4356 ((struct Task *)child_id)->tc_UserData = csp;
4357 Signal((struct Task *)child_id, SIGF_SINGLE);
4362 #if !defined(SELECTED_ONE_OPTION)
4365 /* This block is only needed when using fork().
4366 * When using threads, the server thread was
4367 * created and run by the call to _beginthread().
4369 if (child_id == 0) /* child */
4372 #ifdef FEATURE_TOGGLE
4373 int inherited_toggle_state = global_toggle_state;
4374 #endif /* def FEATURE_TOGGLE */
4379 * If we've been toggled or we've blocked the request, tell Mom
4382 #ifdef FEATURE_TOGGLE
4383 if (inherited_toggle_state != global_toggle_state)
4385 rc |= RC_FLAG_TOGGLED;
4387 #endif /* def FEATURE_TOGGLE */
4389 #ifdef FEATURE_STATISTICS
4390 if (csp->flags & CSP_FLAG_REJECTED)
4392 rc |= RC_FLAG_BLOCKED;
4394 #endif /* ndef FEATURE_STATISTICS */
4398 else if (child_id > 0) /* parent */
4400 /* in a fork()'d environment, the parent's
4401 * copy of the client socket and the CSP
4405 #if !defined(_WIN32) && !defined(__CYGWIN__)
4407 wait( &child_status );
4410 * Evaluate child's return code: If the child has
4411 * - been toggled, toggle ourselves
4412 * - blocked its request, bump up the stats counter
4415 #ifdef FEATURE_TOGGLE
4416 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
4418 global_toggle_state = !global_toggle_state;
4420 #endif /* def FEATURE_TOGGLE */
4422 #ifdef FEATURE_STATISTICS
4424 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
4428 #endif /* def FEATURE_STATISTICS */
4430 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
4431 close_socket(csp->cfd);
4432 csp->flags &= ~CSP_FLAG_ACTIVE;
4436 #undef SELECTED_ONE_OPTION
4437 /* end of cpp switch () */
4442 * Spawning the child failed, assume it's because
4443 * there are too many children running already.
4444 * XXX: If you assume ...
4446 log_error(LOG_LEVEL_ERROR,
4447 "Unable to take any additional connections: %E");
4448 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
4449 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
4450 close_socket(csp->cfd);
4451 csp->flags &= ~CSP_FLAG_ACTIVE;
4460 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
4462 /* Clean up. Aim: free all memory (no leaks) */
4463 #ifdef FEATURE_GRACEFUL_TERMINATION
4465 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
4467 unload_current_config_file();
4468 unload_current_actions_file();
4469 unload_current_re_filterfile();
4470 #ifdef FEATURE_TRUST
4471 unload_current_trust_file();
4474 if (config->multi_threaded)
4481 } while ((clients->next != NULL) && (--i > 0));
4485 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
4496 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
4497 /* Cleanup - remove taskbar icon etc. */
4502 #endif /* FEATURE_GRACEFUL_TERMINATION */