1 const char jcc_rcs[] = "$Id: jcc.c,v 1.240 2009/04/09 10:12:54 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 1.240 2009/04/09 10:12:54 fabiankeil
37 * Fix two cases in which an invalid server response would result
38 * in the client connection being closed without sending an error
41 * Revision 1.239 2009/04/07 11:43:50 fabiankeil
42 * If the server rudely resets the connection directly after sending the
43 * headers, pass the mess to the client instead of sending an incorrect
44 * connect-failed message. Fixes #2698674 reported by mybugaccount.
46 * Revision 1.238 2009/03/27 14:42:30 fabiankeil
47 * Correct the status code for CONNECTION_TIMEOUT_RESPONSE.
49 * Revision 1.237 2009/03/27 14:32:04 fabiankeil
50 * If spawning a child in listen_loop() fails, send a real
51 * HTTP response to the client and continue listening for
52 * new connections without artificial delay.
54 * Revision 1.236 2009/03/25 17:30:24 fabiankeil
55 * In serve(), keep the client socket open until we marked the
56 * server socket as unused. This should increase the chances
57 * that we reuse the connection for the client's next request
58 * to the same destination.
60 * Revision 1.235 2009/03/18 21:01:20 fabiankeil
61 * Comment fix. Spotted by Roland.
63 * Revision 1.234 2009/03/18 20:48:42 fabiankeil
64 * If the --no-daemon option is used, enable LOG_LEVEL_INFO
65 * before the config file has been parsed (as we always did).
67 * Revision 1.233 2009/03/13 14:10:07 fabiankeil
68 * Fix some more harmless warnings on amd64.
70 * Revision 1.232 2009/03/08 19:29:16 fabiankeil
71 * Reinitialize the timeout structure every time before passing
72 * it to select(). Apparently some implementations mess with it.
73 * Probably fixes #2669131 reported by cyberpatrol.
75 * Revision 1.231 2009/03/08 14:19:23 fabiankeil
76 * Fix justified (but harmless) compiler warnings
77 * on platforms where sizeof(int) < sizeof(long).
79 * Revision 1.230 2009/03/07 13:09:17 fabiankeil
80 * Change csp->expected_content and_csp->expected_content_length from
81 * size_t to unsigned long long to reduce the likelihood of integer
82 * overflows that would let us close the connection prematurely.
83 * Bug found while investigating #2669131, reported by cyberpatrol.
85 * Revision 1.229 2009/03/07 11:17:01 fabiankeil
86 * Fix compiler warning.
88 * Revision 1.228 2009/03/06 20:30:13 fabiankeil
89 * Log unsigned values as such.
91 * Revision 1.227 2009/03/02 19:18:11 fabiankeil
92 * Streamline parse_http_request()'s prototype. As
93 * cparser pointed out it doesn't actually use csp.
95 * Revision 1.226 2009/03/01 18:28:24 fabiankeil
96 * Help clang understand that we aren't dereferencing
99 * Revision 1.225 2009/02/19 18:09:32 fabiankeil
100 * Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
103 * Revision 1.224 2009/02/14 15:32:04 fabiankeil
104 * Add the request URL to the timeout message in chat().
107 * Revision 1.223 2009/02/09 21:21:16 fabiankeil
108 * Now that init_log_module() is called earlier, call show_version()
109 * later on from main() directly so it doesn't get called for --help
112 * Revision 1.222 2009/02/08 12:56:51 fabiankeil
113 * Call initialize_mutexes() before init_log_module() again.
114 * Broken since r220, might be the cause of Lee's #2579448.
116 * Revision 1.221 2009/02/06 18:02:58 fabiankeil
117 * When dropping privileges, also give up membership in supplementary
118 * groups. Thanks to Matthias Drochner for reporting the problem,
119 * providing the initial patch and testing the final version.
121 * Revision 1.220 2009/02/04 18:29:07 fabiankeil
122 * Initialize the log module before parsing arguments.
123 * Thanks to Matthias Drochner for the report.
125 * Revision 1.219 2009/01/31 16:08:21 fabiankeil
126 * Remove redundant error check in receive_client_request().
128 * Revision 1.218 2009/01/31 12:25:54 fabiankeil
129 * Flatten indentation in receive_client_request().
131 * Revision 1.217 2009/01/07 19:50:09 fabiankeil
132 * - If the socket-timeout has been reached and the client
133 * hasn't received any data yet, send an explanation before
134 * closing the connection.
135 * - In get_request_line(), signal timeouts the right way.
137 * Revision 1.216 2008/12/24 22:13:11 ler762
138 * fix GCC 3.4.4 warning
140 * Revision 1.215 2008/12/24 17:06:19 fabiankeil
141 * Keep a thread around to timeout alive connections
142 * even if no new requests are coming in.
144 * Revision 1.214 2008/12/20 14:53:55 fabiankeil
145 * Add config option socket-timeout to control the time
146 * Privoxy waits for data to arrive on a socket. Useful
147 * in case of stale ssh tunnels or when fuzz-testing.
149 * Revision 1.213 2008/12/15 18:45:51 fabiankeil
150 * When logging crunches, log the whole URL, so one can easily
151 * differentiate between vanilla HTTP and CONNECT requests.
153 * Revision 1.212 2008/12/14 15:46:22 fabiankeil
154 * Give crunched requests their own log level.
156 * Revision 1.211 2008/12/06 10:05:03 fabiankeil
157 * Downgrade "Received x bytes while expecting y." message to
158 * LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
160 * Revision 1.210 2008/12/02 22:03:18 fabiankeil
161 * Don't miscalculate byte_count if we don't get all the
162 * server headers with one read_socket() call. With keep-alive
163 * support enabled, this caused delays until the server closed
166 * Revision 1.209 2008/11/27 09:44:04 fabiankeil
167 * Cosmetics for the last commit: Don't watch out for
168 * the last chunk if the content isn't chunk-encoded or
169 * if we already determined the content length previously.
171 * Revision 1.208 2008/11/26 18:24:17 fabiankeil
172 * Recognize that the server response is complete if the
173 * last chunk is read together with the server headers.
176 * Revision 1.207 2008/11/25 17:25:16 fabiankeil
177 * Don't convert the client-header list to text until we need to.
179 * Revision 1.206 2008/11/23 17:00:11 fabiankeil
180 * Some more chat() cosmetics.
182 * Revision 1.205 2008/11/16 12:43:49 fabiankeil
183 * Turn keep-alive support into a runtime feature
184 * that is disabled by setting keep-alive-timeout
185 * to a negative value.
187 * Revision 1.204 2008/11/06 19:42:17 fabiankeil
188 * Fix last-chunk detection hack to also apply
189 * if buf[] contains nothing but the last-chunk.
191 * Revision 1.203 2008/11/06 18:34:35 fabiankeil
192 * Factor receive_client_request() and
193 * parse_client_request() out of chat().
195 * Revision 1.202 2008/11/02 18:40:34 fabiankeil
196 * If we received a different amount of data than we expected,
197 * log a warning and make sure the server socket isn't reused.
199 * Revision 1.201 2008/11/02 16:48:20 fabiankeil
200 * Revert revision 1.195 and try again.
202 * Revision 1.200 2008/10/26 16:53:18 fabiankeil
205 * Revision 1.199 2008/10/26 15:36:10 fabiankeil
206 * Remove two debug messages with LOG_LEVEL_INFO.
208 * Revision 1.198 2008/10/22 15:19:55 fabiankeil
209 * Once More, With Feeling: if there is no logfile
210 * because the user didn't specify one, we shouldn't
211 * call init_error_log() after receiving SIGHUP either.
213 * Revision 1.197 2008/10/20 17:02:40 fabiankeil
214 * If SIGHUP is received while we aren't running in daemon
215 * mode, calling init_error_log() would be a mistake.
217 * Revision 1.196 2008/10/16 09:16:41 fabiankeil
218 * - Fix two gcc44 conversion warnings.
219 * - Don't bother logging the last five bytes
222 * Revision 1.195 2008/10/13 16:04:37 fabiankeil
223 * Make sure we don't try to reuse tainted server sockets.
225 * Revision 1.194 2008/10/12 18:35:18 fabiankeil
226 * The last commit was a bit too ambitious, apparently the content
227 * length adjustment is only necessary if we aren't buffering.
229 * Revision 1.193 2008/10/12 15:57:35 fabiankeil
230 * Fix content length calculation if we read headers
231 * and the start of the body at once. Now that we have
232 * FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
234 * Revision 1.192 2008/10/11 18:19:14 fabiankeil
235 * Even more chat() cosmetics.
237 * Revision 1.191 2008/10/11 18:00:14 fabiankeil
238 * Reformat some comments in chat().
240 * Revision 1.190 2008/10/11 14:58:00 fabiankeil
241 * In case of chunk-encoded content, stop reading if
242 * the buffer looks like it ends with the last chunk.
244 * Revision 1.189 2008/10/11 09:53:00 fabiankeil
245 * Let server_response_is_complete() deal properly with
246 * content that is neither buffered nor read all at once.
248 * Revision 1.188 2008/10/09 18:21:41 fabiankeil
249 * Flush work-in-progress changes to keep outgoing connections
250 * alive where possible. Incomplete and mostly #ifdef'd out.
252 * Revision 1.187 2008/09/07 12:35:05 fabiankeil
253 * Add mutex lock support for _WIN32.
255 * Revision 1.186 2008/09/04 08:13:58 fabiankeil
256 * Prepare for critical sections on Windows by adding a
257 * layer of indirection before the pthread mutex functions.
259 * Revision 1.185 2008/08/30 12:03:07 fabiankeil
260 * Remove FEATURE_COOKIE_JAR.
262 * Revision 1.184 2008/08/22 15:34:45 fabiankeil
263 * - Silence LLVM/Clang complaint.
264 * - Make received_hup_signal static.
265 * - Hide definitions for basedir, pidfile and received_hup_signal
266 * from __EMX__ as they only seem to be used in case of #ifdef unix.
268 * Revision 1.183 2008/08/21 07:09:35 fabiankeil
269 * Accept Shoutcast responses again. Problem reported
270 * and fix suggested by Stefan in #2062860.
272 * Revision 1.182 2008/06/27 11:13:56 fabiankeil
273 * Fix possible NULL-pointer dereference reported
274 * by din_a4 in #2003937. Pointy hat to me.
276 * Revision 1.181 2008/05/21 15:47:15 fabiankeil
277 * Streamline sed()'s prototype and declare
278 * the header parse and add structures static.
280 * Revision 1.180 2008/05/21 15:26:32 fabiankeil
281 * - Mark csp as immutable for send_crunch_response().
282 * - Fix comment spelling.
284 * Revision 1.179 2008/05/20 20:13:32 fabiankeil
285 * Factor update_server_headers() out of sed(), ditch the
286 * first_run hack and make server_patterns_light static.
288 * Revision 1.178 2008/05/10 13:23:38 fabiankeil
289 * Don't provide get_header() with the whole client state
290 * structure when it only needs access to csp->iob.
292 * Revision 1.177 2008/05/10 11:51:12 fabiankeil
293 * Make the "read the rest of the headers" loop a bit more readable.
295 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
296 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
297 * - Remove useless comment.
299 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
300 * Fix comment grammar.
302 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
303 * Remove the pointless buffer in client_protocol_is_unsupported().
305 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
306 * Least-effort fix for bug #1821930 (reported by Lee):
307 * If the response doesn't look like HTTP,
308 * tell the client and log the problem.
310 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
311 * Don't pass the whole csp structure to flush_socket()
312 * when it only needs a file descriptor and a buffer.
314 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
315 * Remove kill-popups action.
317 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
318 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
320 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
321 * Remove the treat-forbidden-connects-like-blocks action. We now
322 * use the "blocked" page for forbidden CONNECT requests by default.
324 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
325 * Also use shiny new connect_port_is_forbidden() in jcc.c.
327 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
328 * Rename url_actions() to get_url_actions() and let it
329 * use the standard parameter ordering.
331 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
332 * Let forward_url() use the standard parameter ordering
333 * and mark its second parameter immutable.
335 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
336 * Remove the "Listening ... for local connections only" log message.
337 * Whether or not remote connections are able to reach Privoxy is up
338 * to the operating system.
340 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
341 * Prevent the log messages for CONNECT requests to unacceptable
342 * ports from printing the limit-connect argument as [null] if
343 * limit-connect hasn't been explicitly enabled.
345 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
346 * Make sure all console-mode apps get a usage() instance
348 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
349 * Reword NO_SERVER_DATA_RESPONSE to make it harder
350 * to misunderstand what the message is all about.
352 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
353 * Unbreak trustfile which previously didn't work without
354 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
356 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
357 * Plug memory leak. Spotted by Valgrind, triggered by
358 * Privoxy-Regression-Test feeding proxyfuzz.py.
360 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
361 * In the HTTP snipplets, refer to the client as client.
363 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
364 * Emit a log message when activating the MS IIS5 hack.
366 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
367 * Log the "weak randomization factor" warning only
368 * once for mingw32 and provide some more details.
370 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
371 * Initialize log module after initializing mutexes, future
372 * deadlocks in that code should now work cross-platform.
374 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
375 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
376 * Reported by Bert van Leeuwen in BR#1818808.
378 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
379 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
381 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
382 * When in daemon mode, close stderr after the configuration file has been
383 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
385 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
386 * - Fix a crash when parsing invalid requests whose first header
387 * is rejected by get_header(). Regression (re?)introduced
388 * in r1.143 by yours truly.
389 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
390 * client_cookie_adder() to make sure send-vanilla-wafer can be
391 * controlled through tags (and thus regression-tested).
393 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
394 * - Move get_filter_function() from jcc.c to filters.c
395 * so the filter functions can be static.
396 * - Don't bother filtering body-less responses.
398 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
399 * Execute content filters through execute_content_filter().
401 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
402 * Initialize req to NULL to make sure it's defined if the
403 * first read_socket() call fails. Reported by icmp30.
405 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
406 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
407 * extensive comments moved to user manual.
409 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
410 * Don't crash if a broken header filter wiped out the request line.
412 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
413 * Fix byte_count calculation in case of flushes
414 * and don't parse the server headers a second time.
416 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
417 * - If there's a connection problem after we already forwarded
418 * parts of the original content, just hang up. Fixes BR#1776724.
419 * - Fix warnings about unused code on mingw32.
420 * - In case of flushes, calculate the byte count
421 * less incorrectly (I think).
423 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
424 * Add some more prototypes for static functions.
426 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
427 * Comment out request_contains_null_bytes() until it's used again.
429 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
430 * #1763173 from Stefan Huehner: s@const static@static const@
431 * and declare some more functions static.
433 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
434 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
435 * and explain why they were rejected in the first place.
436 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
437 * CONNECT requests. The request line was missing.
438 * - Add two more XXX reminders as we don't have enough already.
440 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
441 * As Hal noticed, checking dispatch_cgi() as the last cruncher
442 * looks like a bug if CGI requests are blocked unintentionally,
443 * so don't do it unless the user enabled the new config option
444 * "allow-cgi-request-crunching".
446 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
447 * - Allow to rewrite the request destination behind the client's back.
448 * - Turn the weird-looking unconditional for loop that
449 * reads the client request into a conditional while loop.
450 * Move the stuff that only runs once out of the loop.
451 * - Move parts of chat(), server_content_type() and the
452 * necessary stuff to fix BR#1750917 into get_filter_function().
454 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
455 * Temporary workaround for BR#1730105.
457 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
458 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
459 * deadlocks and crashes on OpenBSD and possibly other OS with neither
460 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
461 * Thanks to Ralf Horstmann for report and solution.
463 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
464 * Add forward-override{} to change the forwarding settings through
465 * action sections. This is mainly interesting to forward different
466 * clients differently (for example based on User-Agent or request
469 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
470 * - Let usage() mention the --chroot parameter.
471 * - Use read_socket() consistently and always leave
472 * the last buffer byte alone, even in cases where
473 * null termination (currently) doesn't matter.
475 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
476 * - Fix config file loading on Unix if no config file is specified.
477 * Since r1.97 Privoxy would always interpret the last argument as
478 * config file, even if it's a valid command line option.
479 * - Abort in case of unrecognized command line options. Closes #1719696.
480 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
481 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
483 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
484 * - Don't rerun crunchers that only depend on the request URL.
485 * - Don't count redirects and CGI requests as "blocked requests".
487 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
488 * Support crunching based on tags created by server-header taggers.
490 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
491 * Make HTTP snippets static (again). Add a Content-Type for those
492 * with content so the browser doesn't guess it based on the URL.
494 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
495 * Move crunching and request line rebuilding out of chat().
497 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
498 * Introduce tags as alternative way to specify which
499 * actions apply to a request. At the moment tags can be
500 * created based on client and server headers.
502 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
503 * Don't CLF-log CONNECT requests twice.
505 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
506 * Log the source address for ACL-related connection drops.
508 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
509 * New config option: enforce-blocks.
511 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
512 * - Move null byte check into separate function.
513 * - Don't confuse the client with error pages
514 * if a CONNECT request was already confirmed.
516 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
517 * Speed up NULL byte escaping and only log the complete
518 * NULL byte requests with header debugging enabled.
520 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
521 * Answer requests that contain NULL bytes with
522 * a custom response instead of waiting for more
523 * data until the client eventually hangs up.
525 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
526 * - Move delivery and logging of crunched responses
527 * from chat() into send_crunch_response().
528 * - Display the reason for generating http_responses.
529 * - Log the content length for LOG_LEVEL_CLF correctly
530 * (still incorrect for some fixed responses).
531 * - Reword an incorrect comment about
532 * treat-forbidden-connects-like-blocks violating
534 * - Add some log messages.
536 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
537 * Move mutex initialization into separate
538 * function and exit in case of errors.
540 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
541 * - Start to reduce chat()'s line count and move
542 * parts of it into separate functions.
543 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
545 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
546 * - Add Proxy-Agent header to HTTP snippets that are
547 * supposed to reach HTTP clients only.
548 * - Made a few CONNECT log messages more descriptive.
549 * - Catch completely empty server responses (as seen
550 * with Tor's fake ".noconnect" top level domain).
551 * - Use shiny new "forwarding-failed" template for socks errors.
553 * Revision 1.118 2007/01/07 07:43:43 joergs
554 * AmigaOS4 support added.
556 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
557 * Added config option accept-intercepted-requests
558 * and disabled it by default.
560 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
561 * Reverted parts of my last commit
562 * to keep error handling working.
564 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
565 * Fixed gcc43 conversion warnings.
567 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
568 * Fix -pedantic ISO C warning about converting
569 * from function pointer to object pointer.
571 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
572 * Silence compiler warning I introduced with my last commit.
574 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
575 * Mutex protect rand() if POSIX threading
576 * is used, warn the user if that's not possible
577 * and stop using it on _WIN32 where it could
580 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
581 * Don't prevent core dumps by catching SIGABRT.
582 * It's rude and makes debugging unreasonable painful.
584 * Revision 1.110 2006/12/13 14:52:53 etresoft
585 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
587 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
588 * Privoxy is now able to run as intercepting
589 * proxy in combination with any packet filter
590 * that does the port redirection. The destination
591 * is extracted from the "Host:" header which
592 * should be available for nearly all requests.
594 * Moved HTTP snipplets into jcc.c.
595 * Added error message for gopher proxy requests.
597 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
598 * Only unlink the pidfile if it's actually used.
600 * Change order of interception checks to make
601 * it possible to block or redirect requests for
604 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
605 * Make pthread mutex locking more generic. Instead of
606 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
607 * and use mutex locking unless there is an _r function
608 * available. Better safe than sorry.
610 * Fixes "./configure --disable-pthread" and should result
611 * in less threading-related problems on pthread-using platforms,
612 * but it still doesn't fix BR#1122404.
614 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
615 * Move pthread.h inclusion from jcc.c to jcc.h.
616 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
618 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
619 * Don't exit after receiving the second SIGHUP on Solaris.
621 * Fixes BR 1052235, but the same problem may exist on other
622 * systems. Once 3.0.6 is out we should use sigset()
623 * where available and see if it breaks anything.
625 * Revision 1.104 2006/09/23 13:26:38 roro
626 * Replace TABs by spaces in source code.
628 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
629 * Fix +redirect{}. Didn't work with -fast-redirects.
631 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
632 * Respond with 400 and a short text message
633 * if the client tries to use Privoxy as FTP proxy.
635 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
636 * Make number of retries in case of forwarded-connect problems
637 * a config file option (forwarded-connect-retries) and use 0 as
640 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
641 * Set random(3) seed.
643 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
644 * Follow the OpenBSD port's lead and protect the resolve
645 * functions on OpenBSD as well.
647 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
648 * --user fix. Only use the user as group if no group is specified.
649 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
651 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
652 * Windows service (re-)integration
656 * --install[:service_name]
657 * --uninstall[:service_name]
660 * They work as follows:
661 * --install will create a service for you and then terminate.
662 * By default the service name will be "privoxy" (without the quotes).
663 * However you can run multiple services if you wish, just by adding
664 * a colon and then a name (no spaces).
666 * --uninstall follows the exact same rules a --install.
668 * --service is used when the program is executed by the service
669 * control manager, and in normal circumstances would never be
670 * used as a command line argument.
672 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
673 * Windows service integration
675 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
676 * Incorporate Fabian Keil's patch work:
677 http://www.fabiankeil.de/sourcecode/privoxy/
679 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
680 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
681 * with what was really the latest development (the v_3_0_branch branch)
683 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
684 * Thanks to Jindrich Makovicka for a race condition fix for the log
685 * file. The race condition remains for non-pthread implementations.
686 * Reference patch #1175720.
688 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
689 * Add the ability to check jpeg images for invalid
690 * lengths of comment blocks. Defensive strategy
691 * against the exploit:
692 * Microsoft Security Bulletin MS04-028
693 * Buffer Overrun in JPEG Processing (GDI+) Could
694 * Allow Code Execution (833987)
695 * Enabled with +inspect-jpegs in actions files.
697 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
698 * - Fixed usage info for non-unix platforms
699 * - Fixed small cmdline parsing bug
701 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
702 * Diagnostics: Now preserve the returncode of pthread_create
703 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
705 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
706 * No longer ignore SIGCHLD. Fixes bug #769381
708 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
709 * Close jarfile on graceful exit, remove stray line
711 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
712 * Cosmetics: Killed a warning, a typo and an allocation left at exit
714 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
715 * No longer rely on non-POSIX.1 extensions of getcwd().
718 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
719 * Replaced setenv() by posix-compliant putenv()
720 * Thanks to Neil McCalden (nmcc AT users.sf.net).
722 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
723 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
725 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
726 * Clean-up and extension of improvements for forked mode:
727 * - Child's return code now consists of flags RC_FLAG_*
728 * - Reporting toggle to parent now properly #ifdef'ed
729 * - Children now report blocking to parent. This enables
730 * statistics in forked mode
732 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
733 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
734 * Children now report having been toggled through _exit(17), parents
735 * watch for that code and toggle themselves if found.
737 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
738 * Wrapping all *_r functions (the non-_r versions of them) with
739 * mutex semaphores for OSX. Hopefully this will take care of all
740 * of those pesky crash reports.
742 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
743 * Fixed two mostly harmless mem leaks
745 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
746 * Fix: Head of global clients list now initialized to NULL
748 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
749 * Added basic support for OPTIONS and TRACE HTTP methods:
750 * - New interceptor direct_response() added in chat().
751 * - sed() moved to earlier in the process, so that the
752 * Host: header is evaluated before actions and forwarding
755 * Revision 1.92 2002/05/08 16:00:46 oes
756 * Chat's buffer handling:
757 * - Fixed bug with unchecked out-of-mem conditions
758 * while reading client request & server headers
759 * - No longer predict if the buffer limit will be exceeded
760 * in the next read -- check add_to_iob's new
761 * return code. If buffer couldn't be extended
762 * (policy or out-of-mem) while
763 * - reading from client: abort
764 * - reading server headers: send error page
765 * - buffering server body for filter: flush,
766 * and if that fails: send error page
768 * Revision 1.91 2002/04/08 20:35:58 swa
771 * Revision 1.90 2002/04/02 14:57:28 oes
772 * Made sending wafers independent of FEATURE_COOKIE_JAR
774 * Revision 1.89 2002/03/31 17:18:59 jongfoster
775 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
777 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
778 * More compiler warning message maintenance
780 * Revision 1.87 2002/03/26 22:29:54 swa
781 * we have a new homepage!
783 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
784 * Workaround for closing the jarfile before load_config() comes around again
786 * Revision 1.85 2002/03/24 15:23:33 jongfoster
789 * Revision 1.84 2002/03/24 13:25:43 swa
790 * name change related issues
792 * Revision 1.83 2002/03/16 23:54:06 jongfoster
793 * Adding graceful termination feature, to help look for memory leaks.
794 * If you enable this (which, by design, has to be done by hand
795 * editing config.h) and then go to http://i.j.b/die, then the program
796 * will exit cleanly after the *next* request. It should free all the
797 * memory that was used.
799 * Revision 1.82 2002/03/13 00:27:05 jongfoster
802 * Revision 1.81 2002/03/12 01:42:50 oes
803 * Introduced modular filters
805 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
806 * OS/2 port maintenance:
807 * - Fixed EMX build - it had decayed a little
808 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
809 * substituted a memset for now.
811 * Revision 1.79 2002/03/09 20:03:52 jongfoster
812 * - Making various functions return int rather than size_t.
813 * (Undoing a recent change). Since size_t is unsigned on
814 * Windows, functions like read_socket that return -1 on
815 * error cannot return a size_t.
817 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
818 * crashes, and also frequently caused JB to jump to 100%
819 * CPU and stay there. (Because it thought it had just
820 * read ((unsigned)-1) == 4Gb of data...)
822 * - The signature of write_socket has changed, it now simply
823 * returns success=0/failure=nonzero.
825 * - Trying to get rid of a few warnings --with-debug on
826 * Windows, I've introduced a new type "jb_socket". This is
827 * used for the socket file descriptors. On Windows, this
828 * is SOCKET (a typedef for unsigned). Everywhere else, it's
829 * an int. The error value can't be -1 any more, so it's
830 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
831 * Windows it maps to the #define INVALID_SOCKET.)
833 * - The signature of bind_port has changed.
835 * Revision 1.78 2002/03/08 21:35:04 oes
836 * Added optional group supplement to --user option. Will now use default group of user if no group given
838 * Revision 1.77 2002/03/07 03:52:06 oes
839 * - Fixed compiler warnings etc
840 * - Improved handling of failed DNS lookups
842 * Revision 1.76 2002/03/06 22:54:35 jongfoster
843 * Automated function-comment nitpicking.
845 * Revision 1.75 2002/03/06 10:02:19 oes
846 * Fixed stupid bug when --user was not given
848 * Revision 1.74 2002/03/06 00:49:31 jongfoster
849 * Fixing warning on Windows
850 * Making #ifdefs that refer to the same variable consistently
851 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
853 * Revision 1.73 2002/03/05 23:57:30 hal9
854 * Stray character 's' on line 1618 was breaking build.
856 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
857 * - Re-enable OS/2 building after new parms were added
858 * - Fix false out of memory report when resolving CGI templates when no IP
859 * address is available of failed attempt (a la no such domain)
861 * Revision 1.71 2002/03/05 18:13:56 oes
862 * Added --user option
864 * Revision 1.70 2002/03/05 04:52:42 oes
865 * Deleted non-errlog debugging code
867 * Revision 1.69 2002/03/04 23:50:00 jongfoster
868 * Splitting off bind_port() call into bind_port_helper(), with
871 * Revision 1.68 2002/03/04 20:17:32 oes
874 * Revision 1.67 2002/03/04 18:18:57 oes
875 * - Removed _DEBUG mode
876 * - Cleand up cmdline parsing
877 * - Introduced --no-daemon, --pidfile options
878 * - Cleaned up signal handling:
879 * - Terminate cleanly on INT, TERM and ABRT
880 * - Schedule logfile for re-opening on HUP
881 * - Ignore CHLD and PIPE
882 * - Leave the rest with their default handlers
883 * - Uniform handler registration
884 * - Added usage() function
885 * - Played styleguide police
887 * Revision 1.66 2002/03/03 15:06:55 oes
888 * Re-enabled automatic config reloading
890 * Revision 1.65 2002/03/03 14:49:11 oes
891 * Fixed CLF logging: Now uses client's original HTTP request
893 * Revision 1.64 2002/03/03 09:18:03 joergs
894 * Made jumbjuster work on AmigaOS again.
896 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
897 * Clean up a little CRLF unpleasantness that suddenly appeared
899 * Revision 1.62 2002/02/20 23:17:23 jongfoster
900 * Detecting some out-of memory conditions and exiting with a log message.
902 * Revision 1.61 2002/01/17 21:01:52 jongfoster
903 * Moving all our URL and URL pattern parsing code to urlmatch.c.
905 * Revision 1.60 2001/12/30 14:07:32 steudten
906 * - Add signal handling (unix)
907 * - Add SIGHUP handler (unix)
908 * - Add creation of pidfile (unix)
909 * - Add action 'top' in rc file (RH)
910 * - Add entry 'SIGNALS' to manpage
911 * - Add exit message to logfile (unix)
913 * Revision 1.59 2001/12/13 14:07:18 oes
914 * Fixed Bug: 503 error page now sent OK
916 * Revision 1.58 2001/11/30 23:37:24 jongfoster
917 * Renaming the Win32 config file to config.txt - this is almost the
918 * same as the corresponding UNIX name "config"
920 * Revision 1.57 2001/11/16 00:47:43 jongfoster
921 * Changing the tty-disconnection code to use setsid().
923 * Revision 1.56 2001/11/13 20:20:54 jongfoster
924 * Tabs->spaces, fixing a bug with missing {} around an if()
926 * Revision 1.55 2001/11/13 20:14:53 jongfoster
927 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
929 * Revision 1.54 2001/11/07 00:03:14 steudten
930 * Give reliable return value if an error
931 * occurs not just 0 with new daemon mode.
933 * Revision 1.53 2001/11/05 21:41:43 steudten
934 * Add changes to be a real daemon just for unix os.
935 * (change cwd to /, detach from controlling tty, set
936 * process group and session leader to the own process.
938 * Add some fatal-error log message for failed malloc().
939 * Add '-d' if compiled with 'configure --with-debug' to
940 * enable debug output.
942 * Revision 1.52 2001/10/26 20:11:20 jongfoster
943 * Fixing type mismatch
945 * Revision 1.51 2001/10/26 17:38:28 oes
948 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
949 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
950 * threads to call select() simultaneously. So, it's time to do a real, live,
951 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
952 * (native). Both versions will work, but using __OS2__ offers multi-threading.
954 * Revision 1.49 2001/10/23 21:41:35 jongfoster
955 * Added call to initialize the (statically-allocated of course)
956 * "out of memory" CGI response.
958 * Revision 1.48 2001/10/10 19:56:46 jongfoster
959 * Moving some code that wasn't cookie-related out of an #ifdef
962 * Revision 1.47 2001/10/10 16:44:36 oes
963 * Added CONNECT destination port limitation check
965 * Revision 1.46 2001/10/08 15:17:41 oes
966 * Re-enabled SSL forwarding
968 * Revision 1.45 2001/10/07 15:42:11 oes
969 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
971 * Moved downgrading of the HTTP version from parse_http_request to
972 * chat(), since we can't decide if it is necessary before we have
973 * determined the actions for the URL. The HTTP command is now
974 * *always* re-built so the repairs need no longer be special-cased.
976 * filter_popups now gets a csp pointer so it can raise the new
977 * CSP_FLAG_MODIFIED flag.
981 * Added configurable size limit for the IOB. If the IOB grows so
982 * large that the next read would exceed the limit, the header
983 * is generated, and the header & unfiltered buffer are flushed
984 * to the client. Chat then continues in non-buffering,
985 * non-filtering body mode.
987 * Revision 1.44 2001/10/02 18:13:57 oes
990 * Revision 1.43 2001/10/02 15:32:13 oes
991 * Moved generation of hdr
993 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
994 * Cleaning up 2 compiler warnings on OS/2.
996 * Revision 1.41 2001/09/16 17:05:14 jongfoster
997 * Removing unused #include showarg.h
999 * Revision 1.40 2001/09/16 15:41:45 jongfoster
1000 * Fixing signed/unsigned comparison warning.
1002 * Revision 1.39 2001/09/16 13:21:27 jongfoster
1003 * Changes to use new list functions.
1005 * Revision 1.38 2001/09/16 13:01:46 jongfoster
1006 * Removing redundant function call that zeroed zalloc()'d memory.
1008 * Revision 1.37 2001/09/10 11:12:24 oes
1009 * Deleted unused variable
1011 * Revision 1.36 2001/09/10 10:56:15 oes
1012 * Silenced compiler warnings
1014 * Revision 1.35 2001/07/31 14:44:22 oes
1015 * Deleted unused size parameter from filter_popups()
1017 * Revision 1.34 2001/07/30 22:08:36 jongfoster
1018 * Tidying up #defines:
1019 * - All feature #defines are now of the form FEATURE_xxx
1020 * - Permanently turned off WIN_GUI_EDIT
1021 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
1023 * Revision 1.33 2001/07/29 19:32:00 jongfoster
1024 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
1026 * Revision 1.32 2001/07/29 18:47:05 jongfoster
1027 * Adding missing #include "loadcfg.h"
1029 * Revision 1.31 2001/07/29 12:17:48 oes
1030 * Applied pthread fix by Paul Lieverse
1032 * Revision 1.30 2001/07/25 22:57:13 jongfoster
1033 * __BEOS__ no longer overrides FEATURE_PTHREAD.
1034 * This is because FEATURE_PTHREAD will soon be widely used, so I
1035 * want to keep it simple.
1037 * Revision 1.29 2001/07/24 12:47:06 oes
1038 * Applied BeOS support update by Eugenia
1040 * Revision 1.28 2001/07/23 13:26:12 oes
1041 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
1043 * Revision 1.27 2001/07/19 19:09:47 haroon
1044 * - Added code to take care of the situation where while processing the first
1045 * server response (which includes the server header), after finding the end
1046 * of the headers we were not looking past the end of the headers for
1047 * content modification. I enabled it for filter_popups.
1048 * Someone else should look to see if other similar operations should be
1049 * done to the discarded portion of the buffer.
1051 * Note 2001/07/20: No, the other content modification mechanisms will process
1052 * the whole iob later anyway. --oes
1054 * Revision 1.26 2001/07/18 12:31:36 oes
1057 * Revision 1.25 2001/07/15 19:43:49 jongfoster
1058 * Supports POSIX threads.
1059 * Also removed some unused #includes.
1061 * Revision 1.24 2001/07/13 14:00:40 oes
1062 * - Generic content modification scheme:
1063 * Each feature has its own applicability flag that is set
1064 * from csp->action->flags.
1065 * Replaced the "filtering" int flag , by a function pointer
1066 * "content_filter" to the function that will do the content
1067 * modification. If it is != NULL, the document will be buffered
1068 * and processed through *content_filter, which must set
1069 * csp->content_length and return a modified copy of the body
1070 * or return NULL (on failiure).
1071 * - Changed csp->is_text to the more generic bitmap csp->content_type
1072 * which can currently take the valued CT_TEXT or CT_GIF
1073 * - Reformatting etc
1074 * - Removed all #ifdef PCRS
1076 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
1077 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
1078 * the `block_acl' call. This prevents a compilation error when the user
1079 * does not wish to use the "ACL" feature.
1081 * Revision 1.22 2001/06/29 21:45:41 oes
1082 * Indentation, CRLF->LF, Tab-> Space
1084 * Revision 1.21 2001/06/29 13:29:36 oes
1085 * - Cleaned up, improved comments
1086 * - Unified all possible interceptors (CGI,
1087 * block, trust, fast_redirect) in one
1088 * place, with one (CGI) answer generation
1089 * mechansim. Much clearer now.
1090 * - Removed the GIF image generation, which
1091 * is now done in filters.c:block_url()
1092 * - Made error conditions like domain lookup
1093 * failiure or (various) problems while talking
1094 * to the server use cgi.c:error_response()
1095 * instead of generating HTML/HTTP in chat() (yuck!)
1096 * - Removed logentry from cancelled commit
1098 * Revision 1.20 2001/06/09 10:55:28 jongfoster
1099 * Changing BUFSIZ ==> BUFFER_SIZE
1101 * Revision 1.19 2001/06/07 23:12:52 jongfoster
1102 * Replacing function pointer in struct gateway with a directly
1103 * called function forwarded_connect().
1104 * Replacing struct gateway with struct forward_spec
1106 * Revision 1.18 2001/06/03 19:12:16 oes
1107 * introduced new cgi handling
1109 * Revision 1.17 2001/06/01 20:07:23 jongfoster
1110 * Now uses action +image-blocker{} rather than config->tinygif
1112 * Revision 1.16 2001/06/01 18:49:17 jongfoster
1113 * Replaced "list_share" with "list" - the tiny memory gain was not
1114 * worth the extra complexity.
1116 * Revision 1.15 2001/05/31 21:24:47 jongfoster
1117 * Changed "permission" to "action" throughout.
1118 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
1119 * Moved vanilla wafer check into chat(), since we must now
1120 * decide whether or not to add it based on the URL.
1122 * Revision 1.14 2001/05/29 20:14:01 joergs
1123 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
1126 * Revision 1.13 2001/05/29 09:50:24 jongfoster
1127 * Unified blocklist/imagelist/permissionslist.
1128 * File format is still under discussion, but the internal changes
1129 * are (mostly) done.
1131 * Also modified interceptor behaviour:
1132 * - We now intercept all URLs beginning with one of the following
1133 * prefixes (and *only* these prefixes):
1135 * * http://ijbswa.sf.net/config/
1136 * * http://ijbswa.sourceforge.net/config/
1137 * - New interceptors "home page" - go to http://i.j.b/ to see it.
1138 * - Internal changes so that intercepted and fast redirect pages
1139 * are not replaced with an image.
1140 * - Interceptors now have the option to send a binary page direct
1141 * to the client. (i.e. ijb-send-banner uses this)
1142 * - Implemented show-url-info interceptor. (Which is why I needed
1143 * the above interceptors changes - a typical URL is
1144 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
1145 * The previous mechanism would not have intercepted that, and
1146 * if it had been intercepted then it then it would have replaced
1147 * it with an image.)
1149 * Revision 1.12 2001/05/27 22:17:04 oes
1151 * - re_process_buffer no longer writes the modified buffer
1152 * to the client, which was very ugly. It now returns the
1153 * buffer, which it is then written by chat.
1155 * - content_length now adjusts the Content-Length: header
1156 * for modified documents rather than crunch()ing it.
1157 * (Length info in csp->content_length, which is 0 for
1158 * unmodified documents)
1160 * - For this to work, sed() is called twice when filtering.
1162 * Revision 1.11 2001/05/26 17:27:53 jongfoster
1163 * Added support for CLF and fixed LOG_LEVEL_LOG.
1164 * Also did CRLF->LF fix of my previous patch.
1166 * Revision 1.10 2001/05/26 15:26:15 jongfoster
1167 * ACL feature now provides more security by immediately dropping
1168 * connections from untrusted hosts.
1170 * Revision 1.9 2001/05/26 00:28:36 jongfoster
1171 * Automatic reloading of config file.
1172 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
1173 * Most of the global variables have been moved to a new
1174 * struct configuration_spec, accessed through csp->config->globalname
1175 * Most of the globals remaining are used by the Win32 GUI.
1177 * Revision 1.8 2001/05/25 22:43:18 jongfoster
1178 * Fixing minor memory leak and buffer overflow.
1180 * Revision 1.7 2001/05/25 22:34:30 jongfoster
1183 * Revision 1.6 2001/05/23 00:13:58 joergs
1184 * AmigaOS support fixed.
1186 * Revision 1.5 2001/05/22 18:46:04 oes
1188 * - Enabled filtering banners by size rather than URL
1189 * by adding patterns that replace all standard banner
1190 * sizes with the "Junkbuster" gif to the re_filterfile
1192 * - Enabled filtering WebBugs by providing a pattern
1193 * which kills all 1x1 images
1195 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
1196 * which is selected by the (nonstandard and therefore
1197 * capital) letter 'U' in the option string.
1198 * It causes the quantifiers to be ungreedy by default.
1199 * Appending a ? turns back to greedy (!).
1201 * - Added a new interceptor ijb-send-banner, which
1202 * sends back the "Junkbuster" gif. Without imagelist or
1203 * MSIE detection support, or if tinygif = 1, or the
1204 * URL isn't recognized as an imageurl, a lame HTML
1205 * explanation is sent instead.
1207 * - Added new feature, which permits blocking remote
1208 * script redirects and firing back a local redirect
1210 * The feature is conditionally compiled, i.e. it
1211 * can be disabled with --disable-fast-redirects,
1212 * plus it must be activated by a "fast-redirects"
1213 * line in the config file, has its own log level
1214 * and of course wants to be displayed by show-proxy-args
1215 * Note: Boy, all the #ifdefs in 1001 locations and
1216 * all the fumbling with configure.in and acconfig.h
1217 * were *way* more work than the feature itself :-(
1219 * - Because a generic redirect template was needed for
1220 * this, tinygif = 3 now uses the same.
1222 * - Moved GIFs, and other static HTTP response templates
1225 * - Some minor fixes
1227 * - Removed some >400 CRs again (Jon, you really worked
1230 * Revision 1.4 2001/05/21 19:34:01 jongfoster
1231 * Made failure to bind() a fatal error.
1233 * Revision 1.3 2001/05/20 01:21:20 jongfoster
1234 * Version 2.9.4 checkin.
1235 * - Merged popupfile and cookiefile, and added control over PCRS
1236 * filtering, in new "permissionsfile".
1237 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
1238 * file error you now get a message box (in the Win32 GUI) rather
1239 * than the program exiting with no explanation.
1240 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
1242 * - Removed tabs from "config"
1243 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
1244 * - Bumped up version number.
1246 * Revision 1.2 2001/05/17 22:34:44 oes
1247 * - Added hint on GIF char array generation to jcc.c
1248 * - Cleaned CRLF's from the sources and related files
1249 * - Repaired logging for REF and FRC
1251 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
1252 * Initial import of version 2.9.3 source tree
1255 *********************************************************************/
1261 #include <sys/types.h>
1270 # ifndef FEATURE_PTHREAD
1274 # include <windows.h>
1275 # include <process.h>
1276 # endif /* ndef FEATURE_PTHREAD */
1279 # ifndef _WIN_CONSOLE
1280 # include "w32log.h"
1281 # endif /* ndef _WIN_CONSOLE */
1282 # include "w32svrapi.h"
1284 #else /* ifndef _WIN32 */
1286 # if !defined (__OS2__)
1287 # include <unistd.h>
1288 # include <sys/wait.h>
1289 # endif /* ndef __OS2__ */
1290 # include <sys/time.h>
1291 # include <sys/stat.h>
1292 # include <sys/ioctl.h>
1295 #include <sys/termios.h>
1303 # include <signal.h>
1306 # include <socket.h> /* BeOS has select() for sockets only. */
1307 # include <OS.h> /* declarations for threads and stuff. */
1310 # if defined(__EMX__) || defined(__OS2__)
1311 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1316 #define bzero(B,N) memset(B,0x00,n)
1320 # include <select.h>
1325 #include "project.h"
1328 #include "filters.h"
1329 #include "loaders.h"
1330 #include "parsers.h"
1331 #include "miscutil.h"
1333 #include "jbsockets.h"
1334 #include "gateway.h"
1335 #include "actions.h"
1337 #include "loadcfg.h"
1338 #include "urlmatch.h"
1340 const char jcc_h_rcs[] = JCC_H_VERSION;
1341 const char project_h_rcs[] = PROJECT_H_VERSION;
1344 struct client_state clients[1];
1345 struct file_list files[1];
1347 #ifdef FEATURE_STATISTICS
1348 int urls_read = 0; /* total nr of urls read inc rejected */
1349 int urls_rejected = 0; /* total nr of urls rejected */
1350 #endif /* def FEATURE_STATISTICS */
1352 #ifdef FEATURE_GRACEFUL_TERMINATION
1353 int g_terminate = 0;
1356 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1357 static void sig_handler(int the_signal);
1359 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1360 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1361 static jb_err get_server_headers(struct client_state *csp);
1362 static const char *crunch_reason(const struct http_response *rsp);
1363 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
1364 static char *get_request_line(struct client_state *csp);
1365 static jb_err receive_client_request(struct client_state *csp);
1366 static jb_err parse_client_request(struct client_state *csp);
1367 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1368 static jb_err change_request_destination(struct client_state *csp);
1369 static void chat(struct client_state *csp);
1370 static void serve(struct client_state *csp);
1371 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1372 static void usage(const char *myname);
1374 static void initialize_mutexes(void);
1375 static jb_socket bind_port_helper(struct configuration_spec *config);
1376 static void listen_loop(void);
1379 void serve(struct client_state *csp);
1380 #else /* ifndef AMIGA */
1381 static void serve(struct client_state *csp);
1382 #endif /* def AMIGA */
1385 static int32 server_thread(void *data);
1386 #endif /* def __BEOS__ */
1389 #define sleep(N) Sleep(((N) * 1000))
1393 #define sleep(N) DosSleep(((N) * 100))
1396 #ifdef MUTEX_LOCKS_AVAILABLE
1398 * XXX: Does the locking stuff really belong in this file?
1400 privoxy_mutex_t log_mutex;
1401 privoxy_mutex_t log_init_mutex;
1402 privoxy_mutex_t connection_reuse_mutex;
1404 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1405 privoxy_mutex_t resolver_mutex;
1406 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1408 #ifndef HAVE_GMTIME_R
1409 privoxy_mutex_t gmtime_mutex;
1410 #endif /* ndef HAVE_GMTIME_R */
1412 #ifndef HAVE_LOCALTIME_R
1413 privoxy_mutex_t localtime_mutex;
1414 #endif /* ndef HAVE_GMTIME_R */
1417 privoxy_mutex_t rand_mutex;
1418 #endif /* ndef HAVE_RANDOM */
1420 #endif /* def MUTEX_LOCKS_AVAILABLE */
1423 const char *basedir = NULL;
1424 const char *pidfile = NULL;
1425 static int received_hup_signal = 0;
1426 #endif /* defined unix */
1428 /* HTTP snipplets. */
1429 static const char CSUCCEED[] =
1430 "HTTP/1.0 200 Connection established\r\n"
1431 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1433 static const char CHEADER[] =
1434 "HTTP/1.0 400 Invalid header received from client\r\n"
1435 "Proxy-Agent: Privoxy " VERSION "\r\n"
1436 "Content-Type: text/plain\r\n"
1437 "Connection: close\r\n\r\n"
1438 "Invalid header received from client.\r\n";
1440 static const char FTP_RESPONSE[] =
1441 "HTTP/1.0 400 Invalid request received from client\r\n"
1442 "Content-Type: text/plain\r\n"
1443 "Connection: close\r\n\r\n"
1444 "Invalid request. Privoxy doesn't support FTP.\r\n";
1446 static const char GOPHER_RESPONSE[] =
1447 "HTTP/1.0 400 Invalid request received from client\r\n"
1448 "Content-Type: text/plain\r\n"
1449 "Connection: close\r\n\r\n"
1450 "Invalid request. Privoxy doesn't support gopher.\r\n";
1452 /* XXX: should be a template */
1453 static const char MISSING_DESTINATION_RESPONSE[] =
1454 "HTTP/1.0 400 Bad request received from client\r\n"
1455 "Proxy-Agent: Privoxy " VERSION "\r\n"
1456 "Content-Type: text/plain\r\n"
1457 "Connection: close\r\n\r\n"
1458 "Bad request. Privoxy was unable to extract the destination.\r\n";
1460 /* XXX: should be a template */
1461 static const char NO_SERVER_DATA_RESPONSE[] =
1462 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1463 "Proxy-Agent: Privoxy " VERSION "\r\n"
1464 "Content-Type: text/plain\r\n"
1465 "Connection: close\r\n\r\n"
1466 "Empty server or forwarder response.\r\n"
1467 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1469 /* XXX: should be a template */
1470 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1471 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1472 "Proxy-Agent: Privoxy " VERSION "\r\n"
1473 "Content-Type: text/plain\r\n"
1474 "Connection: close\r\n\r\n"
1475 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1478 /* XXX: should be a template */
1479 static const char NULL_BYTE_RESPONSE[] =
1480 "HTTP/1.0 400 Bad request received from client\r\n"
1481 "Proxy-Agent: Privoxy " VERSION "\r\n"
1482 "Content-Type: text/plain\r\n"
1483 "Connection: close\r\n\r\n"
1484 "Bad request. Null byte(s) before end of request.\r\n";
1487 /* XXX: should be a template */
1488 static const char MESSED_UP_REQUEST_RESPONSE[] =
1489 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1490 "Proxy-Agent: Privoxy " VERSION "\r\n"
1491 "Content-Type: text/plain\r\n"
1492 "Connection: close\r\n\r\n"
1493 "Bad request. Messed up with header filters.\r\n";
1495 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
1496 "HTTP/1.0 503 Too many open connections\r\n"
1497 "Proxy-Agent: Privoxy " VERSION "\r\n"
1498 "Content-Type: text/plain\r\n"
1499 "Connection: close\r\n\r\n"
1500 "Maximum number of open connections reached.\r\n";
1502 /* XXX: should be a template */
1503 static const char CONNECTION_TIMEOUT_RESPONSE[] =
1504 "HTTP/1.0 504 Connection timeout\r\n"
1505 "Proxy-Agent: Privoxy " VERSION "\r\n"
1506 "Content-Type: text/plain\r\n"
1507 "Connection: close\r\n\r\n"
1508 "The connection timed out.\r\n";
1510 /* A function to crunch a response */
1511 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1513 /* Crunch function flags */
1514 #define CF_NO_FLAGS 0
1515 /* Cruncher applies to forced requests as well */
1516 #define CF_IGNORE_FORCE 1
1517 /* Crunched requests are counted for the block statistics */
1518 #define CF_COUNT_AS_REJECT 2
1520 /* A crunch function and its flags */
1523 const crunch_func_ptr cruncher;
1527 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1529 /* Complete list of cruncher functions */
1530 static const struct cruncher crunchers_all[] = {
1531 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1532 { block_url, CF_COUNT_AS_REJECT },
1533 #ifdef FEATURE_TRUST
1534 { trust_url, CF_COUNT_AS_REJECT },
1535 #endif /* def FEATURE_TRUST */
1536 { redirect_url, CF_NO_FLAGS },
1537 { dispatch_cgi, CF_IGNORE_FORCE},
1541 /* Light version, used after tags are applied */
1542 static const struct cruncher crunchers_light[] = {
1543 { block_url, CF_COUNT_AS_REJECT },
1544 { redirect_url, CF_NO_FLAGS },
1550 * XXX: Don't we really mean
1556 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1557 /*********************************************************************
1559 * Function : sig_handler
1561 * Description : Signal handler for different signals.
1562 * Exit gracefully on TERM and INT
1563 * or set a flag that will cause the errlog
1564 * to be reopened by the main thread on HUP.
1567 * 1 : the_signal = the signal cause this function to call
1571 *********************************************************************/
1572 static void sig_handler(int the_signal)
1578 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1590 received_hup_signal = 1;
1596 * We shouldn't be here, unless we catch signals
1597 * in main() that we can't handle here!
1599 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1607 /*********************************************************************
1609 * Function : client_protocol_is_unsupported
1611 * Description : Checks if the client used a known unsupported
1612 * protocol and deals with it by sending an error
1616 * 1 : csp = Current client state (buffers, headers, etc...)
1617 * 2 : req = the first request line send by the client
1619 * Returns : TRUE if an error response has been generated, or
1620 * FALSE if the request doesn't look invalid.
1622 *********************************************************************/
1623 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1626 * If it's a FTP or gopher request, we don't support it.
1628 * These checks are better than nothing, but they might
1629 * not work in all configurations and some clients might
1630 * have problems digesting the answer.
1632 * They should, however, never cause more problems than
1633 * Privoxy's old behaviour (returning the misleading HTML
1636 * "Could not resolve http://(ftp|gopher)://example.org").
1638 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1640 const char *response = NULL;
1641 const char *protocol = NULL;
1643 if (!strncmpic(req, "GET ftp://", 10))
1645 response = FTP_RESPONSE;
1650 response = GOPHER_RESPONSE;
1651 protocol = "GOPHER";
1653 log_error(LOG_LEVEL_ERROR,
1654 "%s tried to use Privoxy as %s proxy: %s",
1655 csp->ip_addr_str, protocol, req);
1656 log_error(LOG_LEVEL_CLF,
1657 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1659 write_socket(csp->cfd, response, strlen(response));
1668 /*********************************************************************
1670 * Function : get_request_destination_elsewhere
1672 * Description : If the client's request was redirected into
1673 * Privoxy without the client's knowledge,
1674 * the request line lacks the destination host.
1676 * This function tries to get it elsewhere,
1677 * provided accept-intercepted-requests is enabled.
1679 * "Elsewhere" currently only means "Host: header",
1680 * but in the future we may ask the redirecting
1681 * packet filter to look the destination up.
1683 * If the destination stays unknown, an error
1684 * response is send to the client and headers
1685 * are freed so that chat() can return directly.
1688 * 1 : csp = Current client state (buffers, headers, etc...)
1689 * 2 : headers = a header list
1691 * Returns : JB_ERR_OK if the destination is now known, or
1692 * JB_ERR_PARSE if it isn't.
1694 *********************************************************************/
1695 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1699 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1701 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1702 " Privoxy isn't configured to accept intercepted requests.",
1703 csp->ip_addr_str, csp->http->cmd);
1704 /* XXX: Use correct size */
1705 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1706 csp->ip_addr_str, csp->http->cmd);
1708 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1709 destroy_list(headers);
1711 return JB_ERR_PARSE;
1713 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1715 /* Split the domain we just got for pattern matching */
1716 init_domain_components(csp->http);
1722 /* We can't work without destination. Go spread the news.*/
1724 req = list_to_text(headers);
1726 /* XXX: Use correct size */
1727 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1728 csp->ip_addr_str, csp->http->cmd);
1729 log_error(LOG_LEVEL_ERROR,
1730 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1731 csp->ip_addr_str, csp->http->cmd, req);
1734 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1735 destroy_list(headers);
1737 return JB_ERR_PARSE;
1740 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1741 * to get the destination IP address, use it as host directly
1742 * or do a reverse DNS lookup first.
1747 /*********************************************************************
1749 * Function : get_server_headers
1751 * Description : Parses server headers in iob and fills them
1752 * into csp->headers so that they can later be
1756 * 1 : csp = Current client state (buffers, headers, etc...)
1758 * Returns : JB_ERR_OK if everything went fine, or
1759 * JB_ERR_PARSE if the headers were incomplete.
1761 *********************************************************************/
1762 static jb_err get_server_headers(struct client_state *csp)
1764 int continue_hack_in_da_house = 0;
1767 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1772 * continue hack in da house. Ignore the ending of
1773 * this head and continue enlisting header lines.
1774 * The reason is described below.
1776 enlist(csp->headers, "");
1777 continue_hack_in_da_house = 0;
1780 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1783 * It's a bodyless continue response, don't
1784 * stop header parsing after reaching its end.
1786 * As a result Privoxy will concatenate the
1787 * next response's head and parse and deliver
1788 * the headers as if they belonged to one request.
1790 * The client will separate them because of the
1791 * empty line between them.
1793 * XXX: What we're doing here is clearly against
1794 * the intended purpose of the continue header,
1795 * and under some conditions (HTTP/1.0 client request)
1796 * it's a standard violation.
1798 * Anyway, "sort of against the spec" is preferable
1799 * to "always getting confused by Continue responses"
1800 * (Privoxy's behaviour before this hack was added)
1802 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1803 continue_hack_in_da_house = 1;
1805 else if (*header == '\0')
1808 * If the header is empty, but the Continue hack
1809 * isn't active, we can assume that we reached the
1810 * end of the buffer before we hit the end of the
1813 * Inform the caller an let it decide how to handle it.
1815 return JB_ERR_PARSE;
1818 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1821 * XXX: Should we quit the request and return a
1822 * out of memory error page instead?
1824 log_error(LOG_LEVEL_ERROR,
1825 "Out of memory while enlisting server headers. %s lost.",
1835 /*********************************************************************
1837 * Function : crunch_reason
1839 * Description : Translates the crunch reason code into a string.
1842 * 1 : rsp = a http_response
1844 * Returns : A string with the crunch reason or an error description.
1846 *********************************************************************/
1847 static const char *crunch_reason(const struct http_response *rsp)
1849 char * reason = NULL;
1851 assert(rsp != NULL);
1854 return "Internal error while searching for crunch reason";
1857 switch (rsp->reason)
1859 case RSP_REASON_UNSUPPORTED:
1860 reason = "Unsupported HTTP feature";
1862 case RSP_REASON_BLOCKED:
1865 case RSP_REASON_UNTRUSTED:
1866 reason = "Untrusted";
1868 case RSP_REASON_REDIRECTED:
1869 reason = "Redirected";
1871 case RSP_REASON_CGI_CALL:
1872 reason = "CGI Call";
1874 case RSP_REASON_NO_SUCH_DOMAIN:
1875 reason = "DNS failure";
1877 case RSP_REASON_FORWARDING_FAILED:
1878 reason = "Forwarding failed";
1880 case RSP_REASON_CONNECT_FAILED:
1881 reason = "Connection failure";
1883 case RSP_REASON_OUT_OF_MEMORY:
1884 reason = "Out of memory (may mask other reasons)";
1887 reason = "No reason recorded";
1895 /*********************************************************************
1897 * Function : send_crunch_response
1899 * Description : Delivers already prepared response for
1900 * intercepted requests, logs the interception
1901 * and frees the response.
1904 * 1 : csp = Current client state (buffers, headers, etc...)
1905 * 1 : rsp = Fully prepared response. Will be freed on exit.
1907 * Returns : Nothing.
1909 *********************************************************************/
1910 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
1912 const struct http_request *http = csp->http;
1913 char status_code[4];
1915 assert(rsp != NULL);
1916 assert(rsp->head != NULL);
1921 * Not supposed to happen. If it does
1922 * anyway, treat it as an unknown error.
1924 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1925 /* return code doesn't matter */
1930 /* If rsp is still NULL, we have serious internal problems. */
1931 log_error(LOG_LEVEL_FATAL,
1932 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1936 * Extract the status code from the actual head
1937 * that was send to the client. It is the only
1938 * way to get it right for all requests, including
1939 * the fixed ones for out-of-memory problems.
1941 * A head starts like this: 'HTTP/1.1 200...'
1945 status_code[0] = rsp->head[9];
1946 status_code[1] = rsp->head[10];
1947 status_code[2] = rsp->head[11];
1948 status_code[3] = '\0';
1950 /* Write the answer to the client */
1951 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1952 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1954 /* There is nothing we can do about it. */
1955 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1958 /* Log that the request was crunched and why. */
1959 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
1960 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
1961 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1963 /* Clean up and return */
1964 if (cgi_error_memory() != rsp)
1966 free_http_response(rsp);
1973 /*********************************************************************
1975 * Function : request_contains_null_bytes
1977 * Description : Checks for NULL bytes in the request and sends
1978 * an error message to the client if any were found.
1980 * XXX: currently not used, see comment in chat().
1983 * 1 : csp = Current client state (buffers, headers, etc...)
1984 * 2 : buf = Data from the client's request to check.
1985 * 3 : len = The data length.
1987 * Returns : TRUE if the request contained one or more NULL bytes, or
1990 *********************************************************************/
1991 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1993 size_t c_len; /* Request lenght when treated as C string */
1995 c_len = strlen(buf);
2000 * Null byte(s) found. Log the request,
2001 * return an error response and hang up.
2003 size_t tmp_len = c_len;
2008 * Replace NULL byte(s) with '°' characters
2009 * so the request can be logged as string.
2010 * XXX: Is there a better replacement character?
2013 tmp_len += strlen(buf+tmp_len);
2014 } while (tmp_len < len);
2016 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
2017 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
2018 log_error(LOG_LEVEL_HEADER,
2019 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
2021 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
2023 /* XXX: Log correct size */
2024 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2034 /*********************************************************************
2036 * Function : crunch_response_triggered
2038 * Description : Checks if the request has to be crunched,
2039 * and delivers the crunch response if necessary.
2042 * 1 : csp = Current client state (buffers, headers, etc...)
2043 * 2 : crunchers = list of cruncher functions to run
2045 * Returns : TRUE if the request was answered with a crunch response
2048 *********************************************************************/
2049 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
2051 struct http_response *rsp = NULL;
2052 const struct cruncher *c;
2055 * If CGI request crunching is disabled,
2056 * check the CGI dispatcher out of order to
2057 * prevent unintentional blocks or redirects.
2059 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
2060 && (NULL != (rsp = dispatch_cgi(csp))))
2062 /* Deliver, log and free the interception response. */
2063 send_crunch_response(csp, rsp);
2067 for (c = crunchers; c->cruncher != NULL; c++)
2070 * Check the cruncher if either Privoxy is toggled
2071 * on and the request isn't forced, or if the cruncher
2072 * applies to forced requests as well.
2074 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
2075 !(csp->flags & CSP_FLAG_FORCED)) ||
2076 (c->flags & CF_IGNORE_FORCE))
2078 rsp = c->cruncher(csp);
2081 /* Deliver, log and free the interception response. */
2082 send_crunch_response(csp, rsp);
2083 #ifdef FEATURE_STATISTICS
2084 if (c->flags & CF_COUNT_AS_REJECT)
2086 csp->flags |= CSP_FLAG_REJECTED;
2088 #endif /* def FEATURE_STATISTICS */
2099 /*********************************************************************
2101 * Function : build_request_line
2103 * Description : Builds the HTTP request line.
2105 * If a HTTP forwarder is used it expects the whole URL,
2106 * web servers only get the path.
2109 * 1 : csp = Current client state (buffers, headers, etc...)
2110 * 2 : fwd = The forwarding spec used for the request
2111 * XXX: Should use http->fwd instead.
2112 * 3 : request_line = The old request line which will be replaced.
2114 * Returns : Nothing. Terminates in case of memory problems.
2116 *********************************************************************/
2117 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
2119 struct http_request *http = csp->http;
2121 assert(http->ssl == 0);
2124 * Downgrade http version from 1.1 to 1.0
2125 * if +downgrade action applies.
2127 if ( (csp->action->flags & ACTION_DOWNGRADE)
2128 && (!strcmpic(http->ver, "HTTP/1.1")))
2131 http->ver = strdup("HTTP/1.0");
2133 if (http->ver == NULL)
2135 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
2140 * Rebuild the request line.
2142 freez(*request_line);
2143 *request_line = strdup(http->gpc);
2144 string_append(request_line, " ");
2146 if (fwd->forward_host)
2148 string_append(request_line, http->url);
2152 string_append(request_line, http->path);
2154 string_append(request_line, " ");
2155 string_append(request_line, http->ver);
2157 if (*request_line == NULL)
2159 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
2161 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
2165 /*********************************************************************
2167 * Function : change_request_destination
2169 * Description : Parse a (rewritten) request line and regenerate
2170 * the http request data.
2173 * 1 : csp = Current client state (buffers, headers, etc...)
2175 * Returns : Forwards the parse_http_request() return code.
2176 * Terminates in case of memory problems.
2178 *********************************************************************/
2179 static jb_err change_request_destination(struct client_state *csp)
2181 struct http_request *http = csp->http;
2184 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
2185 free_http_request(http);
2186 err = parse_http_request(csp->headers->first->str, http);
2187 if (JB_ERR_OK != err)
2189 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2190 jb_err_to_string(err));
2194 /* XXX: ocmd is a misleading name */
2195 http->ocmd = strdup(http->cmd);
2196 if (http->ocmd == NULL)
2198 log_error(LOG_LEVEL_FATAL,
2199 "Out of memory copying rewritten HTTP request line");
2207 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2208 /*********************************************************************
2210 * Function : server_response_is_complete
2212 * Description : Determines whether we should stop reading
2213 * from the server socket.
2216 * 1 : csp = Current client state (buffers, headers, etc...)
2217 * 2 : content_length = Length of content received so far.
2219 * Returns : TRUE if the response is complete,
2222 *********************************************************************/
2223 static int server_response_is_complete(struct client_state *csp,
2224 unsigned long long content_length)
2226 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
2228 if (!strcmpic(csp->http->gpc, "HEAD"))
2231 * "HEAD" implies no body, we are thus expecting
2232 * no content. XXX: incomplete "list" of methods?
2234 csp->expected_content_length = 0;
2235 content_length_known = TRUE;
2238 if (csp->http->status == 304)
2241 * Expect no body. XXX: incomplete "list" of status codes?
2243 csp->expected_content_length = 0;
2244 content_length_known = TRUE;
2247 return (content_length_known && ((0 == csp->expected_content_length)
2248 || (csp->expected_content_length <= content_length)));
2252 /*********************************************************************
2254 * Function : wait_for_alive_connections
2256 * Description : Waits for alive connections to timeout.
2262 *********************************************************************/
2263 static void wait_for_alive_connections()
2265 int connections_alive = close_unusable_connections();
2267 while (0 < connections_alive)
2269 log_error(LOG_LEVEL_CONNECT,
2270 "Waiting for %d connections to timeout.",
2273 connections_alive = close_unusable_connections();
2276 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
2279 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2282 /*********************************************************************
2284 * Function : mark_server_socket_tainted
2286 * Description : Makes sure we don't reuse a server socket
2287 * (if we didn't read everything the server sent
2288 * us reusing the socket would lead to garbage).
2291 * 1 : csp = Current client state (buffers, headers, etc...)
2295 *********************************************************************/
2296 static void mark_server_socket_tainted(struct client_state *csp)
2298 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
2300 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
2301 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
2305 /*********************************************************************
2307 * Function : get_request_line
2309 * Description : Read the client request line.
2312 * 1 : csp = Current client state (buffers, headers, etc...)
2314 * Returns : Pointer to request line or NULL in case of errors.
2316 *********************************************************************/
2317 static char *get_request_line(struct client_state *csp)
2319 char buf[BUFFER_SIZE];
2320 char *request_line = NULL;
2323 memset(buf, 0, sizeof(buf));
2327 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2329 log_error(LOG_LEVEL_ERROR,
2330 "Stopped waiting for the request line.");
2331 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2332 strlen(CONNECTION_TIMEOUT_RESPONSE));
2336 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2338 if (len <= 0) return NULL;
2341 * If there is no memory left for buffering the
2342 * request, there is nothing we can do but hang up
2344 if (add_to_iob(csp, buf, len))
2349 request_line = get_header(csp->iob);
2351 } while ((NULL != request_line) && ('\0' == *request_line));
2353 return request_line;
2358 /*********************************************************************
2360 * Function : receive_client_request
2362 * Description : Read the client's request (more precisely the
2363 * client headers) and answer it if necessary.
2365 * Note that since we're not using select() we could get
2366 * blocked here if a client connected, then didn't say
2370 * 1 : csp = Current client state (buffers, headers, etc...)
2372 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
2374 *********************************************************************/
2375 static jb_err receive_client_request(struct client_state *csp)
2377 char buf[BUFFER_SIZE];
2380 struct http_request *http;
2384 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
2385 struct list header_list;
2386 struct list *headers = &header_list;
2390 memset(buf, 0, sizeof(buf));
2392 req = get_request_line(csp);
2395 return JB_ERR_PARSE;
2397 assert(*req != '\0');
2399 if (client_protocol_is_unsupported(csp, req))
2401 return JB_ERR_PARSE;
2404 #ifdef FEATURE_FORCE_LOAD
2406 * If this request contains the FORCE_PREFIX and blocks
2407 * aren't enforced, get rid of it and set the force flag.
2409 if (strstr(req, FORCE_PREFIX))
2411 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2413 log_error(LOG_LEVEL_FORCE,
2414 "Ignored force prefix in request: \"%s\".", req);
2418 strclean(req, FORCE_PREFIX);
2419 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2420 csp->flags |= CSP_FLAG_FORCED;
2423 #endif /* def FEATURE_FORCE_LOAD */
2425 err = parse_http_request(req, http);
2427 if (JB_ERR_OK != err)
2429 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2430 /* XXX: Use correct size */
2431 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2432 log_error(LOG_LEVEL_ERROR,
2433 "Couldn't parse request line received from %s: %s",
2434 csp->ip_addr_str, jb_err_to_string(err));
2436 free_http_request(http);
2437 return JB_ERR_PARSE;
2440 /* grab the rest of the client's headers */
2444 p = get_header(csp->iob);
2448 /* There are no additional headers to read. */
2455 * We didn't receive a complete header
2456 * line yet, get the rest of it.
2458 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2460 log_error(LOG_LEVEL_ERROR,
2461 "Stopped grabbing the client headers.");
2462 return JB_ERR_PARSE;
2465 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2468 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2469 destroy_list(headers);
2470 return JB_ERR_PARSE;
2473 if (add_to_iob(csp, buf, len))
2476 * If there is no memory left for buffering the
2477 * request, there is nothing we can do but hang up
2479 destroy_list(headers);
2480 return JB_ERR_MEMORY;
2486 * We were able to read a complete
2487 * header and can finaly enlist it.
2494 if (http->host == NULL)
2497 * If we still don't know the request destination,
2498 * the request is invalid or the client uses
2499 * Privoxy without its knowledge.
2501 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2504 * Our attempts to get the request destination
2505 * elsewhere failed or Privoxy is configured
2506 * to only accept proxy requests.
2508 * An error response has already been send
2509 * and we're done here.
2511 return JB_ERR_PARSE;
2516 * Determine the actions for this URL
2518 #ifdef FEATURE_TOGGLE
2519 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2521 /* Most compatible set of actions (i.e. none) */
2522 init_current_action(csp->action);
2525 #endif /* ndef FEATURE_TOGGLE */
2527 get_url_actions(csp, http);
2531 * Save a copy of the original request for logging
2533 http->ocmd = strdup(http->cmd);
2534 if (http->ocmd == NULL)
2536 log_error(LOG_LEVEL_FATAL,
2537 "Out of memory copying HTTP request line");
2539 enlist(csp->headers, http->cmd);
2541 /* Append the previously read headers */
2542 list_append_list_unique(csp->headers, headers);
2543 destroy_list(headers);
2550 /*********************************************************************
2552 * Function : parse_client_request
2554 * Description : Parses the client's request and decides what to do
2557 * Note that since we're not using select() we could get
2558 * blocked here if a client connected, then didn't say
2562 * 1 : csp = Current client state (buffers, headers, etc...)
2564 * Returns : JB_ERR_OK or JB_ERR_PARSE
2566 *********************************************************************/
2567 static jb_err parse_client_request(struct client_state *csp)
2569 struct http_request *http = csp->http;
2572 err = sed(csp, FILTER_CLIENT_HEADERS);
2573 if (JB_ERR_OK != err)
2575 /* XXX: Should be handled in sed(). */
2576 assert(err == JB_ERR_PARSE);
2577 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
2579 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2581 /* Check request line for rewrites. */
2582 if ((NULL == csp->headers->first->str)
2583 || (strcmp(http->cmd, csp->headers->first->str) &&
2584 (JB_ERR_OK != change_request_destination(csp))))
2587 * A header filter broke the request line - bail out.
2589 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2590 /* XXX: Use correct size */
2591 log_error(LOG_LEVEL_CLF,
2592 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2593 log_error(LOG_LEVEL_ERROR,
2594 "Invalid request line after applying header filters.");
2595 free_http_request(http);
2597 return JB_ERR_PARSE;
2605 /*********************************************************************
2609 * Description : Once a connection to the client has been accepted,
2610 * this function is called (via serve()) to handle the
2611 * main business of the communication. When this
2612 * function returns, the caller must close the client
2615 * FIXME: chat is nearly thousand lines long.
2619 * 1 : csp = Current client state (buffers, headers, etc...)
2621 * Returns : Nothing.
2623 *********************************************************************/
2624 static void chat(struct client_state *csp)
2626 char buf[BUFFER_SIZE];
2633 int ms_iis5_hack = 0;
2634 unsigned long long byte_count = 0;
2635 int forwarded_connect_retries = 0;
2636 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
2637 const struct forward_spec *fwd;
2638 struct http_request *http;
2639 long len = 0; /* for buffer sizes (and negative error codes) */
2641 /* Function that does the content filtering for the current request */
2642 filter_function_ptr content_filter = NULL;
2644 /* Skeleton for HTTP response, if we should intercept the request */
2645 struct http_response *rsp;
2646 struct timeval timeout;
2648 memset(buf, 0, sizeof(buf));
2652 if (receive_client_request(csp) != JB_ERR_OK)
2656 if (parse_client_request(csp) != JB_ERR_OK)
2661 /* decide how to route the HTTP request */
2662 fwd = forward_url(csp, http);
2665 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2666 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2671 * build the http request to send to the server
2672 * we have to do one of the following:
2674 * create = use the original HTTP request to create a new
2675 * HTTP request that has either the path component
2676 * without the http://domainspec (w/path) or the
2677 * full orininal URL (w/url)
2678 * Note that the path and/or the HTTP version may
2679 * have been altered by now.
2681 * connect = Open a socket to the host:port of the server
2682 * and short-circuit server and client socket.
2684 * pass = Pass the request unchanged if forwarding a CONNECT
2685 * request to a parent proxy. Note that we'll be sending
2686 * the CFAIL message ourselves if connecting to the parent
2687 * fails, but we won't send a CSUCCEED message if it works,
2688 * since that would result in a double message (ours and the
2689 * parent's). After sending the request to the parent, we simply
2692 * here's the matrix:
2695 * +--------+--------+
2697 * 0 | create | connect|
2699 * Forwarding +--------+--------+
2701 * 1 | create | pass |
2703 * +--------+--------+
2707 if (http->ssl && connect_port_is_forbidden(csp))
2709 const char *acceptable_connect_ports =
2710 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2711 assert(NULL != acceptable_connect_ports);
2712 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2713 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2714 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2715 csp->action->flags |= ACTION_BLOCK;
2721 freez(csp->headers->first->str);
2722 build_request_line(csp, fwd, &csp->headers->first->str);
2726 * We have a request. Check if one of the crunchers wants it.
2728 if (crunch_response_triggered(csp, crunchers_all))
2731 * Yes. The client got the crunch response
2732 * and we are done here after cleaning up.
2734 /* XXX: why list_remove_all()? */
2735 list_remove_all(csp->headers);
2740 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2742 if (fwd->forward_host)
2744 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2745 fwd->forward_host, fwd->forward_port, http->hostport);
2749 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2752 /* here we connect to the server, gateway, or the forwarder */
2754 while ((csp->sfd = forwarded_connect(fwd, http, csp))
2755 && (errno == EINVAL)
2756 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2758 log_error(LOG_LEVEL_ERROR,
2759 "failed request #%u to connect to %s. Trying again.",
2760 forwarded_connect_retries, http->hostport);
2763 if (csp->sfd == JB_INVALID_SOCKET)
2765 if (fwd->type != SOCKS_NONE)
2768 rsp = error_response(csp, "forwarding-failed", errno);
2770 else if (errno == EINVAL)
2772 rsp = error_response(csp, "no-such-domain", errno);
2776 rsp = error_response(csp, "connect-failed", errno);
2777 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2781 /* Write the answer to the client */
2784 send_crunch_response(csp, rsp);
2790 hdr = list_to_text(csp->headers);
2793 /* FIXME Should handle error properly */
2794 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2796 list_remove_all(csp->headers);
2798 if (fwd->forward_host || (http->ssl == 0))
2801 * Write the client's (modified) header to the server
2802 * (along with anything else that may be in the buffer)
2804 if (write_socket(csp->sfd, hdr, strlen(hdr))
2805 || (flush_socket(csp->sfd, csp->iob) < 0))
2807 log_error(LOG_LEVEL_CONNECT,
2808 "write header to: %s failed: %E", http->hostport);
2810 rsp = error_response(csp, "connect-failed", errno);
2813 send_crunch_response(csp, rsp);
2823 * We're running an SSL tunnel and we're not forwarding,
2824 * so just send the "connect succeeded" message to the
2825 * client, flush the rest, and get out of the way.
2827 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2835 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2837 /* we're finished with the client's header */
2840 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
2842 /* pass data between the client and server
2843 * until one or the other shuts down the connection.
2852 * FD_ZERO here seems to point to an errant macro which crashes.
2853 * So do this by hand for now...
2855 memset(&rfds,0x00,sizeof(fd_set));
2859 FD_SET(csp->cfd, &rfds);
2860 FD_SET(csp->sfd, &rfds);
2862 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2863 if ((csp->flags & CSP_FLAG_CHUNKED)
2864 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2865 && ((csp->iob->eod - csp->iob->cur) >= 5)
2866 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2868 log_error(LOG_LEVEL_CONNECT,
2869 "Looks like we read the last chunk together with "
2870 "the server headers. We better stop reading.");
2871 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2872 csp->expected_content_length = byte_count;
2873 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2875 if (server_body && server_response_is_complete(csp, byte_count))
2877 log_error(LOG_LEVEL_CONNECT,
2878 "Done reading from server. Expected content length: %llu. "
2879 "Actual content length: %llu. Most recently received: %d.",
2880 csp->expected_content_length, byte_count, len);
2883 * XXX: should not jump around,
2884 * chat() is complicated enough already.
2888 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2890 timeout.tv_sec = csp->config->socket_timeout;
2891 timeout.tv_usec = 0;
2892 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
2896 log_error(LOG_LEVEL_ERROR,
2897 "Didn't receive data in time: %s", http->url);
2898 if ((byte_count == 0) && (http->ssl == 0))
2900 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2901 strlen(CONNECTION_TIMEOUT_RESPONSE));
2903 mark_server_socket_tainted(csp);
2908 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2909 mark_server_socket_tainted(csp);
2914 * This is the body of the browser's request,
2915 * just read and write it.
2917 if (FD_ISSET(csp->cfd, &rfds))
2919 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2923 /* XXX: not sure if this is necessary. */
2924 mark_server_socket_tainted(csp);
2925 break; /* "game over, man" */
2928 if (write_socket(csp->sfd, buf, (size_t)len))
2930 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2931 mark_server_socket_tainted(csp);
2938 * The server wants to talk. It could be the header or the body.
2939 * If `hdr' is null, then it's the header otherwise it's the body.
2940 * FIXME: Does `hdr' really mean `host'? No.
2942 if (FD_ISSET(csp->sfd, &rfds))
2945 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2949 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2951 if (http->ssl && (fwd->forward_host == NULL))
2954 * Just hang up. We already confirmed the client's CONNECT
2955 * request with status code 200 and unencrypted content is
2956 * no longer welcome.
2958 log_error(LOG_LEVEL_ERROR,
2959 "CONNECT already confirmed. Unable to tell the client about the problem.");
2962 else if (byte_count)
2965 * Just hang up. We already transmitted the original headers
2966 * and parts of the original content and therefore missed the
2967 * chance to send an error message (without risking data corruption).
2969 * XXX: we could retry with a fancy range request here.
2971 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2972 "Unable to tell the client about the problem.");
2973 mark_server_socket_tainted(csp);
2977 * XXX: Consider handling the cases above the same.
2979 mark_server_socket_tainted(csp);
2983 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2984 if (csp->flags & CSP_FLAG_CHUNKED)
2986 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
2988 /* XXX: this is a temporary hack */
2989 log_error(LOG_LEVEL_CONNECT,
2990 "Looks like we reached the end of the last chunk. "
2991 "We better stop reading.");
2992 csp->expected_content_length = byte_count + (unsigned long long)len;
2993 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2997 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
3000 * Add a trailing zero to let be able to use string operations.
3001 * XXX: do we still need this with filter_popups gone?
3006 * Normally, this would indicate that we've read
3007 * as much as the server has sent us and we can
3008 * close the client connection. However, Microsoft
3009 * in its wisdom has released IIS/5 with a bug that
3010 * prevents it from sending the trailing \r\n in
3011 * a 302 redirect header (and possibly other headers).
3012 * To work around this if we've haven't parsed
3013 * a full header we'll append a trailing \r\n
3014 * and see if this now generates a valid one.
3016 * This hack shouldn't have any impacts. If we've
3017 * already transmitted the header or if this is a
3018 * SSL connection, then we won't bother with this
3019 * hack. So we only work on partially received
3020 * headers. If we append a \r\n and this still
3021 * doesn't generate a valid header, then we won't
3022 * transmit anything to the client.
3027 if (server_body || http->ssl)
3030 * If we have been buffering up the document,
3031 * now is the time to apply content modification
3032 * and send the result to the client.
3036 p = execute_content_filter(csp, content_filter);
3038 * If the content filter fails, use the original
3039 * buffer and length.
3040 * (see p != NULL ? p : csp->iob->cur below)
3044 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3047 if (JB_ERR_OK != update_server_headers(csp))
3049 log_error(LOG_LEVEL_FATAL,
3050 "Failed to update server headers. after filtering.");
3053 hdr = list_to_text(csp->headers);
3056 /* FIXME Should handle error properly */
3057 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3060 if (write_socket(csp->cfd, hdr, strlen(hdr))
3061 || write_socket(csp->cfd,
3062 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
3064 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3067 mark_server_socket_tainted(csp);
3075 break; /* "game over, man" */
3079 * This is NOT the body, so
3080 * Let's pretend the server just sent us a blank line.
3082 snprintf(buf, sizeof(buf), "\r\n");
3083 len = (int)strlen(buf);
3086 * Now, let the normal header parsing algorithm below do its
3087 * job. If it fails, we'll exit instead of continuing.
3094 * If this is an SSL connection or we're in the body
3095 * of the server document, just write it to the client,
3096 * unless we need to buffer the body for later content-filtering
3098 if (server_body || http->ssl)
3103 * If there is no memory left for buffering the content, or the buffer limit
3104 * has been reached, switch to non-filtering mode, i.e. make & write the
3105 * header, flush the iob and buf, and get out of the way.
3107 if (add_to_iob(csp, buf, len))
3112 log_error(LOG_LEVEL_INFO,
3113 "Flushing header and buffers. Stepping back from filtering.");
3115 hdr = list_to_text(csp->headers);
3119 * Memory is too tight to even generate the header.
3120 * Send our static "Out-of-memory" page.
3122 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3123 rsp = cgi_error_memory();
3124 send_crunch_response(csp, rsp);
3125 mark_server_socket_tainted(csp);
3128 hdrlen = strlen(hdr);
3130 if (write_socket(csp->cfd, hdr, hdrlen)
3131 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
3132 || (write_socket(csp->cfd, buf, (size_t)len)))
3134 log_error(LOG_LEVEL_CONNECT,
3135 "Flush header and buffers to client failed: %E");
3137 mark_server_socket_tainted(csp);
3142 * Reset the byte_count to the amount of bytes
3143 * we just flushed. len will be added a few lines below,
3144 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3146 byte_count = (unsigned long long)flushed;
3148 content_filter = NULL;
3154 if (write_socket(csp->cfd, buf, (size_t)len))
3156 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3157 mark_server_socket_tainted(csp);
3161 byte_count += (unsigned long long)len;
3166 const char *header_start;
3168 * We're still looking for the end of the server's header.
3169 * Buffer up the data we just read. If that fails, there's
3170 * little we can do but send our static out-of-memory page.
3172 if (add_to_iob(csp, buf, len))
3174 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3175 rsp = cgi_error_memory();
3176 send_crunch_response(csp, rsp);
3177 mark_server_socket_tainted(csp);
3181 header_start = csp->iob->cur;
3183 /* Convert iob into something sed() can digest */
3184 if (JB_ERR_PARSE == get_server_headers(csp))
3189 * Well, we tried our MS IIS/5 hack and it didn't work.
3190 * The header is incomplete and there isn't anything
3191 * we can do about it.
3193 log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3194 "Applying the MS IIS5 hack didn't help.");
3195 log_error(LOG_LEVEL_CLF,
3196 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3197 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3198 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3199 mark_server_socket_tainted(csp);
3205 * Since we have to wait for more from the server before
3206 * we can parse the headers we just continue here.
3208 long header_offset = csp->iob->cur - header_start;
3209 assert(csp->iob->cur >= header_start);
3210 byte_count += (unsigned long long)(len - header_offset);
3211 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
3212 "byte_count: %llu. header_offset: %d. len: %d.",
3213 byte_count, header_offset, len);
3218 /* Did we actually get anything? */
3219 if (NULL == csp->headers->first)
3221 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
3222 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3223 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
3224 free_http_request(http);
3225 mark_server_socket_tainted(csp);
3229 assert(csp->headers->first->str);
3231 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3232 strncmpic(csp->headers->first->str, "ICY", 3))
3235 * It doesn't look like a HTTP (or Shoutcast) response:
3236 * tell the client and log the problem.
3238 if (strlen(csp->headers->first->str) > 30)
3240 csp->headers->first->str[30] = '\0';
3242 log_error(LOG_LEVEL_ERROR,
3243 "Invalid server or forwarder response. Starts with: %s",
3244 csp->headers->first->str);
3245 log_error(LOG_LEVEL_CLF,
3246 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3247 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3248 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3249 free_http_request(http);
3250 mark_server_socket_tainted(csp);
3255 * We have now received the entire server header,
3256 * filter it and send the result to the client
3258 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3260 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
3262 hdr = list_to_text(csp->headers);
3265 /* FIXME Should handle error properly */
3266 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3269 if (crunch_response_triggered(csp, crunchers_light))
3272 * One of the tags created by a server-header
3273 * tagger triggered a crunch. We already
3274 * delivered the crunch response to the client
3275 * and are done here after cleaning up.
3278 mark_server_socket_tainted(csp);
3281 /* Buffer and pcrs filter this if appropriate. */
3283 if (!http->ssl) /* We talk plaintext */
3285 content_filter = get_filter_function(csp);
3288 * Only write if we're not buffering for content modification
3290 if (!content_filter)
3293 * Write the server's (modified) header to
3294 * the client (along with anything else that
3295 * may be in the buffer)
3298 if (write_socket(csp->cfd, hdr, strlen(hdr))
3299 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
3301 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
3304 * The write failed, so don't bother mentioning it
3305 * to the client... it probably can't hear us anyway.
3308 mark_server_socket_tainted(csp);
3312 byte_count += (unsigned long long)len;
3317 * XXX: the header lenght should probably
3318 * be calculated by get_server_headers().
3320 long header_length = csp->iob->cur - header_start;
3321 assert(csp->iob->cur > header_start);
3322 byte_count += (unsigned long long)(len - header_length);
3325 /* we're finished with the server's header */
3331 * If this was a MS IIS/5 hack then it means the server
3332 * has already closed the connection. Nothing more to read.
3337 log_error(LOG_LEVEL_ERROR,
3338 "Closed server connection detected. "
3339 "Applying the MS IIS5 hack didn't help.");
3340 log_error(LOG_LEVEL_CLF,
3341 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3342 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3343 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3344 mark_server_socket_tainted(csp);
3350 mark_server_socket_tainted(csp);
3351 return; /* huh? we should never get here */
3354 if (csp->content_length == 0)
3357 * If Privoxy didn't recalculate the Content-Lenght,
3358 * byte_count is still correct.
3360 csp->content_length = byte_count;
3363 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3364 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3365 && (csp->expected_content_length != byte_count))
3367 log_error(LOG_LEVEL_CONNECT,
3368 "Received %llu bytes while expecting %llu.",
3369 byte_count, csp->expected_content_length);
3370 mark_server_socket_tainted(csp);
3374 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3375 csp->ip_addr_str, http->ocmd, csp->content_length);
3379 /*********************************************************************
3383 * Description : This is little more than chat. We only "serve" to
3384 * to close (or remember) any socket that chat may have
3388 * 1 : csp = Current client state (buffers, headers, etc...)
3392 *********************************************************************/
3394 void serve(struct client_state *csp)
3395 #else /* ifndef AMIGA */
3396 static void serve(struct client_state *csp)
3397 #endif /* def AMIGA */
3401 if (csp->sfd != JB_INVALID_SOCKET)
3403 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3404 static int monitor_thread_running = 0;
3406 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
3407 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
3409 remember_connection(csp->sfd, csp->http, forward_url(csp, csp->http));
3410 close_socket(csp->cfd);
3411 csp->cfd = JB_INVALID_SOCKET;
3412 privoxy_mutex_lock(&connection_reuse_mutex);
3413 if (!monitor_thread_running)
3415 monitor_thread_running = 1;
3416 privoxy_mutex_unlock(&connection_reuse_mutex);
3417 wait_for_alive_connections();
3418 privoxy_mutex_lock(&connection_reuse_mutex);
3419 monitor_thread_running = 0;
3421 privoxy_mutex_unlock(&connection_reuse_mutex);
3425 forget_connection(csp->sfd);
3426 close_socket(csp->sfd);
3429 close_socket(csp->sfd);
3430 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3433 if (csp->cfd != JB_INVALID_SOCKET)
3435 close_socket(csp->cfd);
3438 csp->flags &= ~CSP_FLAG_ACTIVE;
3444 /*********************************************************************
3446 * Function : server_thread
3448 * Description : We only exist to call `serve' in a threaded environment.
3451 * 1 : data = Current client state (buffers, headers, etc...)
3453 * Returns : Always 0.
3455 *********************************************************************/
3456 static int32 server_thread(void *data)
3458 serve((struct client_state *) data);
3465 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3466 /*********************************************************************
3470 * Description : Print usage info & exit.
3472 * Parameters : Pointer to argv[0] for identifying ourselves
3476 *********************************************************************/
3477 static void usage(const char *myname)
3479 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
3483 #endif /* defined(unix) */
3486 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
3487 #endif /* defined(unix) */
3488 "[--version] [configfile]\n"
3489 "Aborting\n", myname);
3494 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
3497 #ifdef MUTEX_LOCKS_AVAILABLE
3498 /*********************************************************************
3500 * Function : privoxy_mutex_lock
3502 * Description : Locks a mutex.
3505 * 1 : mutex = The mutex to lock.
3507 * Returns : Void. May exit in case of errors.
3509 *********************************************************************/
3510 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
3512 #ifdef FEATURE_PTHREAD
3513 int err = pthread_mutex_lock(mutex);
3516 if (mutex != &log_mutex)
3518 log_error(LOG_LEVEL_FATAL,
3519 "Mutex locking failed: %s.\n", strerror(err));
3524 EnterCriticalSection(mutex);
3525 #endif /* def FEATURE_PTHREAD */
3529 /*********************************************************************
3531 * Function : privoxy_mutex_unlock
3533 * Description : Unlocks a mutex.
3536 * 1 : mutex = The mutex to unlock.
3538 * Returns : Void. May exit in case of errors.
3540 *********************************************************************/
3541 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
3543 #ifdef FEATURE_PTHREAD
3544 int err = pthread_mutex_unlock(mutex);
3547 if (mutex != &log_mutex)
3549 log_error(LOG_LEVEL_FATAL,
3550 "Mutex unlocking failed: %s.\n", strerror(err));
3555 LeaveCriticalSection(mutex);
3556 #endif /* def FEATURE_PTHREAD */
3560 /*********************************************************************
3562 * Function : privoxy_mutex_init
3564 * Description : Prepares a mutex.
3567 * 1 : mutex = The mutex to initialize.
3569 * Returns : Void. May exit in case of errors.
3571 *********************************************************************/
3572 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
3574 #ifdef FEATURE_PTHREAD
3575 int err = pthread_mutex_init(mutex, 0);
3578 printf("Fatal error. Mutex initialization failed: %s.\n",
3583 InitializeCriticalSection(mutex);
3584 #endif /* def FEATURE_PTHREAD */
3586 #endif /* def MUTEX_LOCKS_AVAILABLE */
3588 /*********************************************************************
3590 * Function : initialize_mutexes
3592 * Description : Prepares mutexes if mutex support is available.
3596 * Returns : Void, exits in case of errors.
3598 *********************************************************************/
3599 static void initialize_mutexes(void)
3601 #ifdef MUTEX_LOCKS_AVAILABLE
3603 * Prepare global mutex semaphores
3605 privoxy_mutex_init(&log_mutex);
3606 privoxy_mutex_init(&log_init_mutex);
3607 privoxy_mutex_init(&connection_reuse_mutex);
3610 * XXX: The assumptions below are a bit naive
3611 * and can cause locks that aren't necessary.
3613 * For example older FreeBSD versions (< 6.x?)
3614 * have no gethostbyname_r, but gethostbyname is
3617 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
3618 privoxy_mutex_init(&resolver_mutex);
3619 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
3621 * XXX: should we use a single mutex for
3622 * localtime() and gmtime() as well?
3624 #ifndef HAVE_GMTIME_R
3625 privoxy_mutex_init(&gmtime_mutex);
3626 #endif /* ndef HAVE_GMTIME_R */
3628 #ifndef HAVE_LOCALTIME_R
3629 privoxy_mutex_init(&localtime_mutex);
3630 #endif /* ndef HAVE_GMTIME_R */
3633 privoxy_mutex_init(&rand_mutex);
3634 #endif /* ndef HAVE_RANDOM */
3635 #endif /* def MUTEX_LOCKS_AVAILABLE */
3639 /*********************************************************************
3643 * Description : Load the config file and start the listen loop.
3644 * This function is a lot more *sane* with the `load_config'
3645 * and `listen_loop' functions; although it stills does
3646 * a *little* too much for my taste.
3649 * 1 : argc = Number of parameters (including $0).
3650 * 2 : argv = Array of (char *)'s to the parameters.
3652 * Returns : 1 if : can't open config file, unrecognized directive,
3653 * stats requested in multi-thread mode, can't open the
3654 * log file, can't open the jar file, listen port is invalid,
3655 * any load fails, and can't bind port.
3657 * Else main never returns, the process must be signaled
3658 * to terminate execution. Or, on Windows, use the
3659 * "File", "Exit" menu option.
3661 *********************************************************************/
3663 int real_main(int argc, const char *argv[])
3665 int main(int argc, const char *argv[])
3669 unsigned int random_seed;
3671 struct passwd *pw = NULL;
3672 struct group *grp = NULL;
3675 char *pre_chroot_nslookup_to_load_resolver = NULL;
3682 #if !defined(_WIN32)
3689 /* Prepare mutexes if supported and necessary. */
3690 initialize_mutexes();
3692 /* Enable logging until further notice. */
3696 * Parse the command line arguments
3698 * XXX: simply printing usage information in case of
3699 * invalid arguments isn't particularly user friendly.
3701 while (++argc_pos < argc)
3704 /* Check to see if the service must be installed or uninstalled */
3705 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3707 const char *pName = argv[argc_pos] + 9;
3710 exit( (install_service(pName)) ? 0 : 1 );
3712 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3714 const char *pName = argv[argc_pos] + 11;
3717 exit((uninstall_service(pName)) ? 0 : 1);
3719 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3721 bRunAsService = TRUE;
3722 w32_set_service_cwd();
3723 atexit(w32_service_exit_notify);
3726 #endif /* defined(_WIN32) */
3729 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3731 if (strcmp(argv[argc_pos], "--help") == 0)
3736 else if(strcmp(argv[argc_pos], "--version") == 0)
3738 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3744 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3746 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
3750 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3752 if (++argc_pos == argc) usage(argv[0]);
3753 pidfile = strdup(argv[argc_pos]);
3756 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3758 if (++argc_pos == argc) usage(argv[argc_pos]);
3760 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3763 if (NULL == (grp = getgrnam(p)))
3765 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3769 if (NULL == (pw = getpwnam(argv[argc_pos])))
3771 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3774 if (p != NULL) *--p = '\0';
3777 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3779 if (++argc_pos == argc) usage(argv[0]);
3780 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3783 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3787 #endif /* defined(unix) */
3789 else if (argc_pos + 1 != argc)
3792 * This is neither the last command line
3793 * option, nor was it recognized before,
3794 * therefore it must be invalid.
3800 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3802 configfile = argv[argc_pos];
3805 } /* -END- while (more arguments) */
3807 show_version(Argv[0]);
3810 if ( *configfile != '/' )
3812 char cwd[BUFFER_SIZE];
3814 size_t abs_file_size;
3816 /* make config-filename absolute here */
3817 if (NULL == getcwd(cwd, sizeof(cwd)))
3819 perror("failed to get current working directory");
3824 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3825 basedir = strdup(cwd);
3827 if (NULL == basedir ||
3828 NULL == (abs_file = malloc(abs_file_size)))
3830 perror("malloc failed");
3833 strlcpy(abs_file, basedir, abs_file_size);
3834 strlcat(abs_file, "/", abs_file_size );
3835 strlcat(abs_file, configfile, abs_file_size);
3836 configfile = abs_file;
3838 #endif /* defined unix */
3842 clients->next = NULL;
3844 /* XXX: factor out initialising after the next stable release. */
3847 #elif defined(_WIN32)
3851 random_seed = (unsigned int)time(NULL);
3853 srandom(random_seed);
3856 #endif /* ifdef HAVE_RANDOM */
3859 * Unix signal handling
3861 * Catch the abort, interrupt and terminate signals for a graceful exit
3862 * Catch the hangup signal so the errlog can be reopened.
3863 * Ignore the broken pipe signals (FIXME: Why?)
3865 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3868 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3869 const int ignored_signals[] = { SIGPIPE, 0 };
3871 for (idx = 0; catched_signals[idx] != 0; idx++)
3873 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3874 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3876 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3877 #endif /* ifdef sun */
3879 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3883 for (idx = 0; ignored_signals[idx] != 0; idx++)
3885 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3887 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3892 #else /* ifdef _WIN32 */
3893 # ifdef _WIN_CONSOLE
3895 * We *are* in a windows console app.
3896 * Print a verbose messages about FAQ's and such
3898 printf("%s", win32_blurb);
3899 # endif /* def _WIN_CONSOLE */
3900 #endif /* def _WIN32 */
3903 /* Initialize the CGI subsystem */
3904 cgi_init_error_messages();
3907 * If runnig on unix and without the --nodaemon
3908 * option, become a daemon. I.e. fork, detach
3909 * from tty and get process group leadership
3922 if ( pid < 0 ) /* error */
3927 else if ( pid != 0 ) /* parent */
3932 * must check for errors
3933 * child died due to missing files aso
3936 wpid = waitpid( pid, &status, WNOHANG );
3945 /* Should be more portable, but not as well tested */
3950 #else /* ndef __FreeBSD__ */
3952 #endif /* ndef __FreeBSD__ */
3953 fd = open("/dev/tty", O_RDONLY);
3956 /* no error check here */
3957 ioctl( fd, TIOCNOTTY,0 );
3962 * stderr (fd 2) will be closed later on,
3963 * when the config file has been parsed.
3970 } /* -END- if (!no_daemon) */
3973 * As soon as we have written the PID file, we can switch
3974 * to the user and group ID indicated by the --user option
3980 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3982 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3986 if (setgroups(1, &grp->gr_gid))
3988 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
3991 else if (initgroups(pw->pw_name, pw->pw_gid))
3993 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
3999 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
4001 /* Read the time zone file from /etc before doing chroot. */
4003 if (NULL != pre_chroot_nslookup_to_load_resolver
4004 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
4006 /* Initialize resolver library. */
4007 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
4009 if (chroot(pw->pw_dir) < 0)
4011 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
4015 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
4018 if (setuid(pw->pw_uid))
4020 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
4024 char putenv_dummy[64];
4026 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
4027 if (putenv(putenv_dummy) != 0)
4029 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
4032 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
4033 if (putenv(putenv_dummy) != 0)
4035 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
4041 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
4044 #endif /* defined unix */
4047 /* This will be FALSE unless the command line specified --service
4051 /* Yup, so now we must attempt to establish a connection
4052 * with the service dispatcher. This will only work if this
4053 * process was launched by the service control manager to
4054 * actually run as a service. If this isn't the case, i've
4055 * known it take around 30 seconds or so for the call to return.
4058 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
4059 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
4061 /* Service has run, and at this point is now being stopped, so just return */
4066 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
4068 /* An error occurred. Usually it's because --service was wrongly specified
4069 * and we were unable to connect to the Service Control Dispatcher because
4070 * it wasn't expecting us and is therefore not listening.
4072 * For now, just continue below to call the listen_loop function.
4075 #endif /* def _WIN32 */
4085 /*********************************************************************
4087 * Function : bind_port_helper
4089 * Description : Bind the listen port. Handles logging, and aborts
4093 * 1 : config = Privoxy configuration. Specifies port
4096 * Returns : Port that was opened.
4098 *********************************************************************/
4099 static jb_socket bind_port_helper(struct configuration_spec * config)
4104 if (config->haddr == NULL)
4106 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
4111 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
4112 config->hport, config->haddr);
4115 result = bind_port(config->haddr, config->hport, &bfd);
4122 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4123 "There may be another Privoxy or some other "
4124 "proxy running on port %d",
4125 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
4126 config->hport, config->hport);
4129 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4130 "The hostname is not resolvable",
4131 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4134 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
4135 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4138 /* shouldn't get here */
4139 return JB_INVALID_SOCKET;
4142 config->need_bind = 0;
4149 /* Without this simple workaround we get this compiler warning from _beginthread
4150 * warning C4028: formal parameter 1 different from declaration
4152 void w32_service_listen_loop(void *p)
4156 #endif /* def _WIN32 */
4159 /*********************************************************************
4161 * Function : listen_loop
4163 * Description : bind the listen port and enter a "FOREVER" listening loop.
4169 *********************************************************************/
4170 static void listen_loop(void)
4172 struct client_state *csp = NULL;
4174 struct configuration_spec * config;
4176 config = load_config();
4178 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4180 * XXX: Should be relocated once it no
4181 * longer needs to emit log messages.
4183 initialize_reusable_connections();
4184 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4186 bfd = bind_port_helper(config);
4188 #ifdef FEATURE_GRACEFUL_TERMINATION
4189 while (!g_terminate)
4194 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
4195 while (waitpid(-1, NULL, WNOHANG) > 0)
4197 /* zombie children */
4199 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
4202 * Free data that was used by died threads
4208 * Re-open the errlog after HUP signal
4210 if (received_hup_signal)
4212 if (NULL != config->logfile)
4214 init_error_log(Argv[0], config->logfile);
4216 received_hup_signal = 0;
4220 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
4222 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
4226 csp->flags |= CSP_FLAG_ACTIVE;
4227 csp->sfd = JB_INVALID_SOCKET;
4229 csp->config = config = load_config();
4231 if ( config->need_bind )
4234 * Since we were listening to the "old port", we will not see
4235 * a "listen" param change until the next IJB request. So, at
4236 * least 1 more request must be made for us to find the new
4237 * setting. I am simply closing the old socket and binding the
4240 * Which-ever is correct, we will serve 1 more page via the
4241 * old settings. This should probably be a "show-proxy-args"
4242 * request. This should not be a so common of an operation
4243 * that this will hurt people's feelings.
4248 bfd = bind_port_helper(config);
4251 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
4253 if (!accept_connection(csp, bfd))
4255 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
4268 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
4271 #ifdef FEATURE_TOGGLE
4272 if (global_toggle_state)
4273 #endif /* def FEATURE_TOGGLE */
4275 csp->flags |= CSP_FLAG_TOGGLED_ON;
4278 if (run_loader(csp))
4280 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
4281 /* Never get here - LOG_LEVEL_FATAL causes program exit */
4285 if (block_acl(NULL,csp))
4287 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
4288 close_socket(csp->cfd);
4289 freez(csp->ip_addr_str);
4293 #endif /* def FEATURE_ACL */
4295 /* add it to the list of clients */
4296 csp->next = clients->next;
4297 clients->next = csp;
4299 if (config->multi_threaded)
4303 /* this is a switch () statment in the C preprocessor - ugh */
4304 #undef SELECTED_ONE_OPTION
4306 /* Use Pthreads in preference to native code */
4307 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
4308 #define SELECTED_ONE_OPTION
4310 pthread_t the_thread;
4311 pthread_attr_t attrs;
4313 pthread_attr_init(&attrs);
4314 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
4315 errno = pthread_create(&the_thread, &attrs,
4316 (void * (*)(void *))serve, csp);
4317 child_id = errno ? -1 : 0;
4318 pthread_attr_destroy(&attrs);
4322 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
4323 #define SELECTED_ONE_OPTION
4324 child_id = _beginthread(
4325 (void (*)(void *))serve,
4330 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
4331 #define SELECTED_ONE_OPTION
4332 child_id = _beginthread(
4333 (void(* _Optlink)(void*))serve,
4339 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
4340 #define SELECTED_ONE_OPTION
4342 thread_id tid = spawn_thread
4343 (server_thread, "server", B_NORMAL_PRIORITY, csp);
4345 if ((tid >= 0) && (resume_thread(tid) == B_OK))
4347 child_id = (int) tid;
4356 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
4357 #define SELECTED_ONE_OPTION
4358 csp->cfd = ReleaseSocket(csp->cfd, -1);
4361 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4362 NP_Output, Output(),
4363 NP_CloseOutput, FALSE,
4364 NP_Name, (ULONG)"privoxy child",
4368 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4369 NP_Output, Output(),
4370 NP_CloseOutput, FALSE,
4371 NP_Name, (ULONG)"privoxy child",
4372 NP_StackSize, 200*1024,
4378 ((struct Task *)child_id)->tc_UserData = csp;
4379 Signal((struct Task *)child_id, SIGF_SINGLE);
4384 #if !defined(SELECTED_ONE_OPTION)
4387 /* This block is only needed when using fork().
4388 * When using threads, the server thread was
4389 * created and run by the call to _beginthread().
4391 if (child_id == 0) /* child */
4394 #ifdef FEATURE_TOGGLE
4395 int inherited_toggle_state = global_toggle_state;
4396 #endif /* def FEATURE_TOGGLE */
4401 * If we've been toggled or we've blocked the request, tell Mom
4404 #ifdef FEATURE_TOGGLE
4405 if (inherited_toggle_state != global_toggle_state)
4407 rc |= RC_FLAG_TOGGLED;
4409 #endif /* def FEATURE_TOGGLE */
4411 #ifdef FEATURE_STATISTICS
4412 if (csp->flags & CSP_FLAG_REJECTED)
4414 rc |= RC_FLAG_BLOCKED;
4416 #endif /* ndef FEATURE_STATISTICS */
4420 else if (child_id > 0) /* parent */
4422 /* in a fork()'d environment, the parent's
4423 * copy of the client socket and the CSP
4427 #if !defined(_WIN32) && !defined(__CYGWIN__)
4429 wait( &child_status );
4432 * Evaluate child's return code: If the child has
4433 * - been toggled, toggle ourselves
4434 * - blocked its request, bump up the stats counter
4437 #ifdef FEATURE_TOGGLE
4438 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
4440 global_toggle_state = !global_toggle_state;
4442 #endif /* def FEATURE_TOGGLE */
4444 #ifdef FEATURE_STATISTICS
4446 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
4450 #endif /* def FEATURE_STATISTICS */
4452 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
4453 close_socket(csp->cfd);
4454 csp->flags &= ~CSP_FLAG_ACTIVE;
4458 #undef SELECTED_ONE_OPTION
4459 /* end of cpp switch () */
4464 * Spawning the child failed, assume it's because
4465 * there are too many children running already.
4466 * XXX: If you assume ...
4468 log_error(LOG_LEVEL_ERROR,
4469 "Unable to take any additional connections: %E");
4470 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
4471 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
4472 close_socket(csp->cfd);
4473 csp->flags &= ~CSP_FLAG_ACTIVE;
4482 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
4484 /* Clean up. Aim: free all memory (no leaks) */
4485 #ifdef FEATURE_GRACEFUL_TERMINATION
4487 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
4489 unload_current_config_file();
4490 unload_current_actions_file();
4491 unload_current_re_filterfile();
4492 #ifdef FEATURE_TRUST
4493 unload_current_trust_file();
4496 if (config->multi_threaded)
4503 } while ((clients->next != NULL) && (--i > 0));
4507 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
4518 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
4519 /* Cleanup - remove taskbar icon etc. */
4524 #endif /* FEATURE_GRACEFUL_TERMINATION */