1 const char jcc_rcs[] = "$Id: jcc.c,v 1.242 2009/04/11 10:44:47 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 1.242 2009/04/11 10:44:47 fabiankeil
37 * Update a comment. We're not in Kansas anymore.
39 * Revision 1.241 2009/04/11 10:37:23 fabiankeil
40 * When dropping connections due to ACL, don't leak csp->ip_addr_str.
42 * Revision 1.240 2009/04/09 10:12:54 fabiankeil
43 * Fix two cases in which an invalid server response would result
44 * in the client connection being closed without sending an error
47 * Revision 1.239 2009/04/07 11:43:50 fabiankeil
48 * If the server rudely resets the connection directly after sending the
49 * headers, pass the mess to the client instead of sending an incorrect
50 * connect-failed message. Fixes #2698674 reported by mybugaccount.
52 * Revision 1.238 2009/03/27 14:42:30 fabiankeil
53 * Correct the status code for CONNECTION_TIMEOUT_RESPONSE.
55 * Revision 1.237 2009/03/27 14:32:04 fabiankeil
56 * If spawning a child in listen_loop() fails, send a real
57 * HTTP response to the client and continue listening for
58 * new connections without artificial delay.
60 * Revision 1.236 2009/03/25 17:30:24 fabiankeil
61 * In serve(), keep the client socket open until we marked the
62 * server socket as unused. This should increase the chances
63 * that we reuse the connection for the client's next request
64 * to the same destination.
66 * Revision 1.235 2009/03/18 21:01:20 fabiankeil
67 * Comment fix. Spotted by Roland.
69 * Revision 1.234 2009/03/18 20:48:42 fabiankeil
70 * If the --no-daemon option is used, enable LOG_LEVEL_INFO
71 * before the config file has been parsed (as we always did).
73 * Revision 1.233 2009/03/13 14:10:07 fabiankeil
74 * Fix some more harmless warnings on amd64.
76 * Revision 1.232 2009/03/08 19:29:16 fabiankeil
77 * Reinitialize the timeout structure every time before passing
78 * it to select(). Apparently some implementations mess with it.
79 * Probably fixes #2669131 reported by cyberpatrol.
81 * Revision 1.231 2009/03/08 14:19:23 fabiankeil
82 * Fix justified (but harmless) compiler warnings
83 * on platforms where sizeof(int) < sizeof(long).
85 * Revision 1.230 2009/03/07 13:09:17 fabiankeil
86 * Change csp->expected_content and_csp->expected_content_length from
87 * size_t to unsigned long long to reduce the likelihood of integer
88 * overflows that would let us close the connection prematurely.
89 * Bug found while investigating #2669131, reported by cyberpatrol.
91 * Revision 1.229 2009/03/07 11:17:01 fabiankeil
92 * Fix compiler warning.
94 * Revision 1.228 2009/03/06 20:30:13 fabiankeil
95 * Log unsigned values as such.
97 * Revision 1.227 2009/03/02 19:18:11 fabiankeil
98 * Streamline parse_http_request()'s prototype. As
99 * cparser pointed out it doesn't actually use csp.
101 * Revision 1.226 2009/03/01 18:28:24 fabiankeil
102 * Help clang understand that we aren't dereferencing
103 * NULL pointers here.
105 * Revision 1.225 2009/02/19 18:09:32 fabiankeil
106 * Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
109 * Revision 1.224 2009/02/14 15:32:04 fabiankeil
110 * Add the request URL to the timeout message in chat().
113 * Revision 1.223 2009/02/09 21:21:16 fabiankeil
114 * Now that init_log_module() is called earlier, call show_version()
115 * later on from main() directly so it doesn't get called for --help
118 * Revision 1.222 2009/02/08 12:56:51 fabiankeil
119 * Call initialize_mutexes() before init_log_module() again.
120 * Broken since r220, might be the cause of Lee's #2579448.
122 * Revision 1.221 2009/02/06 18:02:58 fabiankeil
123 * When dropping privileges, also give up membership in supplementary
124 * groups. Thanks to Matthias Drochner for reporting the problem,
125 * providing the initial patch and testing the final version.
127 * Revision 1.220 2009/02/04 18:29:07 fabiankeil
128 * Initialize the log module before parsing arguments.
129 * Thanks to Matthias Drochner for the report.
131 * Revision 1.219 2009/01/31 16:08:21 fabiankeil
132 * Remove redundant error check in receive_client_request().
134 * Revision 1.218 2009/01/31 12:25:54 fabiankeil
135 * Flatten indentation in receive_client_request().
137 * Revision 1.217 2009/01/07 19:50:09 fabiankeil
138 * - If the socket-timeout has been reached and the client
139 * hasn't received any data yet, send an explanation before
140 * closing the connection.
141 * - In get_request_line(), signal timeouts the right way.
143 * Revision 1.216 2008/12/24 22:13:11 ler762
144 * fix GCC 3.4.4 warning
146 * Revision 1.215 2008/12/24 17:06:19 fabiankeil
147 * Keep a thread around to timeout alive connections
148 * even if no new requests are coming in.
150 * Revision 1.214 2008/12/20 14:53:55 fabiankeil
151 * Add config option socket-timeout to control the time
152 * Privoxy waits for data to arrive on a socket. Useful
153 * in case of stale ssh tunnels or when fuzz-testing.
155 * Revision 1.213 2008/12/15 18:45:51 fabiankeil
156 * When logging crunches, log the whole URL, so one can easily
157 * differentiate between vanilla HTTP and CONNECT requests.
159 * Revision 1.212 2008/12/14 15:46:22 fabiankeil
160 * Give crunched requests their own log level.
162 * Revision 1.211 2008/12/06 10:05:03 fabiankeil
163 * Downgrade "Received x bytes while expecting y." message to
164 * LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
166 * Revision 1.210 2008/12/02 22:03:18 fabiankeil
167 * Don't miscalculate byte_count if we don't get all the
168 * server headers with one read_socket() call. With keep-alive
169 * support enabled, this caused delays until the server closed
172 * Revision 1.209 2008/11/27 09:44:04 fabiankeil
173 * Cosmetics for the last commit: Don't watch out for
174 * the last chunk if the content isn't chunk-encoded or
175 * if we already determined the content length previously.
177 * Revision 1.208 2008/11/26 18:24:17 fabiankeil
178 * Recognize that the server response is complete if the
179 * last chunk is read together with the server headers.
182 * Revision 1.207 2008/11/25 17:25:16 fabiankeil
183 * Don't convert the client-header list to text until we need to.
185 * Revision 1.206 2008/11/23 17:00:11 fabiankeil
186 * Some more chat() cosmetics.
188 * Revision 1.205 2008/11/16 12:43:49 fabiankeil
189 * Turn keep-alive support into a runtime feature
190 * that is disabled by setting keep-alive-timeout
191 * to a negative value.
193 * Revision 1.204 2008/11/06 19:42:17 fabiankeil
194 * Fix last-chunk detection hack to also apply
195 * if buf[] contains nothing but the last-chunk.
197 * Revision 1.203 2008/11/06 18:34:35 fabiankeil
198 * Factor receive_client_request() and
199 * parse_client_request() out of chat().
201 * Revision 1.202 2008/11/02 18:40:34 fabiankeil
202 * If we received a different amount of data than we expected,
203 * log a warning and make sure the server socket isn't reused.
205 * Revision 1.201 2008/11/02 16:48:20 fabiankeil
206 * Revert revision 1.195 and try again.
208 * Revision 1.200 2008/10/26 16:53:18 fabiankeil
211 * Revision 1.199 2008/10/26 15:36:10 fabiankeil
212 * Remove two debug messages with LOG_LEVEL_INFO.
214 * Revision 1.198 2008/10/22 15:19:55 fabiankeil
215 * Once More, With Feeling: if there is no logfile
216 * because the user didn't specify one, we shouldn't
217 * call init_error_log() after receiving SIGHUP either.
219 * Revision 1.197 2008/10/20 17:02:40 fabiankeil
220 * If SIGHUP is received while we aren't running in daemon
221 * mode, calling init_error_log() would be a mistake.
223 * Revision 1.196 2008/10/16 09:16:41 fabiankeil
224 * - Fix two gcc44 conversion warnings.
225 * - Don't bother logging the last five bytes
228 * Revision 1.195 2008/10/13 16:04:37 fabiankeil
229 * Make sure we don't try to reuse tainted server sockets.
231 * Revision 1.194 2008/10/12 18:35:18 fabiankeil
232 * The last commit was a bit too ambitious, apparently the content
233 * length adjustment is only necessary if we aren't buffering.
235 * Revision 1.193 2008/10/12 15:57:35 fabiankeil
236 * Fix content length calculation if we read headers
237 * and the start of the body at once. Now that we have
238 * FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
240 * Revision 1.192 2008/10/11 18:19:14 fabiankeil
241 * Even more chat() cosmetics.
243 * Revision 1.191 2008/10/11 18:00:14 fabiankeil
244 * Reformat some comments in chat().
246 * Revision 1.190 2008/10/11 14:58:00 fabiankeil
247 * In case of chunk-encoded content, stop reading if
248 * the buffer looks like it ends with the last chunk.
250 * Revision 1.189 2008/10/11 09:53:00 fabiankeil
251 * Let server_response_is_complete() deal properly with
252 * content that is neither buffered nor read all at once.
254 * Revision 1.188 2008/10/09 18:21:41 fabiankeil
255 * Flush work-in-progress changes to keep outgoing connections
256 * alive where possible. Incomplete and mostly #ifdef'd out.
258 * Revision 1.187 2008/09/07 12:35:05 fabiankeil
259 * Add mutex lock support for _WIN32.
261 * Revision 1.186 2008/09/04 08:13:58 fabiankeil
262 * Prepare for critical sections on Windows by adding a
263 * layer of indirection before the pthread mutex functions.
265 * Revision 1.185 2008/08/30 12:03:07 fabiankeil
266 * Remove FEATURE_COOKIE_JAR.
268 * Revision 1.184 2008/08/22 15:34:45 fabiankeil
269 * - Silence LLVM/Clang complaint.
270 * - Make received_hup_signal static.
271 * - Hide definitions for basedir, pidfile and received_hup_signal
272 * from __EMX__ as they only seem to be used in case of #ifdef unix.
274 * Revision 1.183 2008/08/21 07:09:35 fabiankeil
275 * Accept Shoutcast responses again. Problem reported
276 * and fix suggested by Stefan in #2062860.
278 * Revision 1.182 2008/06/27 11:13:56 fabiankeil
279 * Fix possible NULL-pointer dereference reported
280 * by din_a4 in #2003937. Pointy hat to me.
282 * Revision 1.181 2008/05/21 15:47:15 fabiankeil
283 * Streamline sed()'s prototype and declare
284 * the header parse and add structures static.
286 * Revision 1.180 2008/05/21 15:26:32 fabiankeil
287 * - Mark csp as immutable for send_crunch_response().
288 * - Fix comment spelling.
290 * Revision 1.179 2008/05/20 20:13:32 fabiankeil
291 * Factor update_server_headers() out of sed(), ditch the
292 * first_run hack and make server_patterns_light static.
294 * Revision 1.178 2008/05/10 13:23:38 fabiankeil
295 * Don't provide get_header() with the whole client state
296 * structure when it only needs access to csp->iob.
298 * Revision 1.177 2008/05/10 11:51:12 fabiankeil
299 * Make the "read the rest of the headers" loop a bit more readable.
301 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
302 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
303 * - Remove useless comment.
305 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
306 * Fix comment grammar.
308 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
309 * Remove the pointless buffer in client_protocol_is_unsupported().
311 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
312 * Least-effort fix for bug #1821930 (reported by Lee):
313 * If the response doesn't look like HTTP,
314 * tell the client and log the problem.
316 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
317 * Don't pass the whole csp structure to flush_socket()
318 * when it only needs a file descriptor and a buffer.
320 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
321 * Remove kill-popups action.
323 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
324 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
326 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
327 * Remove the treat-forbidden-connects-like-blocks action. We now
328 * use the "blocked" page for forbidden CONNECT requests by default.
330 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
331 * Also use shiny new connect_port_is_forbidden() in jcc.c.
333 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
334 * Rename url_actions() to get_url_actions() and let it
335 * use the standard parameter ordering.
337 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
338 * Let forward_url() use the standard parameter ordering
339 * and mark its second parameter immutable.
341 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
342 * Remove the "Listening ... for local connections only" log message.
343 * Whether or not remote connections are able to reach Privoxy is up
344 * to the operating system.
346 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
347 * Prevent the log messages for CONNECT requests to unacceptable
348 * ports from printing the limit-connect argument as [null] if
349 * limit-connect hasn't been explicitly enabled.
351 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
352 * Make sure all console-mode apps get a usage() instance
354 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
355 * Reword NO_SERVER_DATA_RESPONSE to make it harder
356 * to misunderstand what the message is all about.
358 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
359 * Unbreak trustfile which previously didn't work without
360 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
362 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
363 * Plug memory leak. Spotted by Valgrind, triggered by
364 * Privoxy-Regression-Test feeding proxyfuzz.py.
366 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
367 * In the HTTP snipplets, refer to the client as client.
369 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
370 * Emit a log message when activating the MS IIS5 hack.
372 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
373 * Log the "weak randomization factor" warning only
374 * once for mingw32 and provide some more details.
376 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
377 * Initialize log module after initializing mutexes, future
378 * deadlocks in that code should now work cross-platform.
380 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
381 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
382 * Reported by Bert van Leeuwen in BR#1818808.
384 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
385 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
387 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
388 * When in daemon mode, close stderr after the configuration file has been
389 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
391 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
392 * - Fix a crash when parsing invalid requests whose first header
393 * is rejected by get_header(). Regression (re?)introduced
394 * in r1.143 by yours truly.
395 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
396 * client_cookie_adder() to make sure send-vanilla-wafer can be
397 * controlled through tags (and thus regression-tested).
399 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
400 * - Move get_filter_function() from jcc.c to filters.c
401 * so the filter functions can be static.
402 * - Don't bother filtering body-less responses.
404 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
405 * Execute content filters through execute_content_filter().
407 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
408 * Initialize req to NULL to make sure it's defined if the
409 * first read_socket() call fails. Reported by icmp30.
411 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
412 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
413 * extensive comments moved to user manual.
415 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
416 * Don't crash if a broken header filter wiped out the request line.
418 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
419 * Fix byte_count calculation in case of flushes
420 * and don't parse the server headers a second time.
422 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
423 * - If there's a connection problem after we already forwarded
424 * parts of the original content, just hang up. Fixes BR#1776724.
425 * - Fix warnings about unused code on mingw32.
426 * - In case of flushes, calculate the byte count
427 * less incorrectly (I think).
429 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
430 * Add some more prototypes for static functions.
432 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
433 * Comment out request_contains_null_bytes() until it's used again.
435 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
436 * #1763173 from Stefan Huehner: s@const static@static const@
437 * and declare some more functions static.
439 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
440 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
441 * and explain why they were rejected in the first place.
442 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
443 * CONNECT requests. The request line was missing.
444 * - Add two more XXX reminders as we don't have enough already.
446 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
447 * As Hal noticed, checking dispatch_cgi() as the last cruncher
448 * looks like a bug if CGI requests are blocked unintentionally,
449 * so don't do it unless the user enabled the new config option
450 * "allow-cgi-request-crunching".
452 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
453 * - Allow to rewrite the request destination behind the client's back.
454 * - Turn the weird-looking unconditional for loop that
455 * reads the client request into a conditional while loop.
456 * Move the stuff that only runs once out of the loop.
457 * - Move parts of chat(), server_content_type() and the
458 * necessary stuff to fix BR#1750917 into get_filter_function().
460 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
461 * Temporary workaround for BR#1730105.
463 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
464 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
465 * deadlocks and crashes on OpenBSD and possibly other OS with neither
466 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
467 * Thanks to Ralf Horstmann for report and solution.
469 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
470 * Add forward-override{} to change the forwarding settings through
471 * action sections. This is mainly interesting to forward different
472 * clients differently (for example based on User-Agent or request
475 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
476 * - Let usage() mention the --chroot parameter.
477 * - Use read_socket() consistently and always leave
478 * the last buffer byte alone, even in cases where
479 * null termination (currently) doesn't matter.
481 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
482 * - Fix config file loading on Unix if no config file is specified.
483 * Since r1.97 Privoxy would always interpret the last argument as
484 * config file, even if it's a valid command line option.
485 * - Abort in case of unrecognized command line options. Closes #1719696.
486 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
487 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
489 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
490 * - Don't rerun crunchers that only depend on the request URL.
491 * - Don't count redirects and CGI requests as "blocked requests".
493 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
494 * Support crunching based on tags created by server-header taggers.
496 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
497 * Make HTTP snippets static (again). Add a Content-Type for those
498 * with content so the browser doesn't guess it based on the URL.
500 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
501 * Move crunching and request line rebuilding out of chat().
503 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
504 * Introduce tags as alternative way to specify which
505 * actions apply to a request. At the moment tags can be
506 * created based on client and server headers.
508 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
509 * Don't CLF-log CONNECT requests twice.
511 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
512 * Log the source address for ACL-related connection drops.
514 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
515 * New config option: enforce-blocks.
517 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
518 * - Move null byte check into separate function.
519 * - Don't confuse the client with error pages
520 * if a CONNECT request was already confirmed.
522 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
523 * Speed up NULL byte escaping and only log the complete
524 * NULL byte requests with header debugging enabled.
526 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
527 * Answer requests that contain NULL bytes with
528 * a custom response instead of waiting for more
529 * data until the client eventually hangs up.
531 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
532 * - Move delivery and logging of crunched responses
533 * from chat() into send_crunch_response().
534 * - Display the reason for generating http_responses.
535 * - Log the content length for LOG_LEVEL_CLF correctly
536 * (still incorrect for some fixed responses).
537 * - Reword an incorrect comment about
538 * treat-forbidden-connects-like-blocks violating
540 * - Add some log messages.
542 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
543 * Move mutex initialization into separate
544 * function and exit in case of errors.
546 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
547 * - Start to reduce chat()'s line count and move
548 * parts of it into separate functions.
549 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
551 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
552 * - Add Proxy-Agent header to HTTP snippets that are
553 * supposed to reach HTTP clients only.
554 * - Made a few CONNECT log messages more descriptive.
555 * - Catch completely empty server responses (as seen
556 * with Tor's fake ".noconnect" top level domain).
557 * - Use shiny new "forwarding-failed" template for socks errors.
559 * Revision 1.118 2007/01/07 07:43:43 joergs
560 * AmigaOS4 support added.
562 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
563 * Added config option accept-intercepted-requests
564 * and disabled it by default.
566 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
567 * Reverted parts of my last commit
568 * to keep error handling working.
570 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
571 * Fixed gcc43 conversion warnings.
573 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
574 * Fix -pedantic ISO C warning about converting
575 * from function pointer to object pointer.
577 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
578 * Silence compiler warning I introduced with my last commit.
580 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
581 * Mutex protect rand() if POSIX threading
582 * is used, warn the user if that's not possible
583 * and stop using it on _WIN32 where it could
586 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
587 * Don't prevent core dumps by catching SIGABRT.
588 * It's rude and makes debugging unreasonable painful.
590 * Revision 1.110 2006/12/13 14:52:53 etresoft
591 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
593 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
594 * Privoxy is now able to run as intercepting
595 * proxy in combination with any packet filter
596 * that does the port redirection. The destination
597 * is extracted from the "Host:" header which
598 * should be available for nearly all requests.
600 * Moved HTTP snipplets into jcc.c.
601 * Added error message for gopher proxy requests.
603 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
604 * Only unlink the pidfile if it's actually used.
606 * Change order of interception checks to make
607 * it possible to block or redirect requests for
610 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
611 * Make pthread mutex locking more generic. Instead of
612 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
613 * and use mutex locking unless there is an _r function
614 * available. Better safe than sorry.
616 * Fixes "./configure --disable-pthread" and should result
617 * in less threading-related problems on pthread-using platforms,
618 * but it still doesn't fix BR#1122404.
620 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
621 * Move pthread.h inclusion from jcc.c to jcc.h.
622 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
624 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
625 * Don't exit after receiving the second SIGHUP on Solaris.
627 * Fixes BR 1052235, but the same problem may exist on other
628 * systems. Once 3.0.6 is out we should use sigset()
629 * where available and see if it breaks anything.
631 * Revision 1.104 2006/09/23 13:26:38 roro
632 * Replace TABs by spaces in source code.
634 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
635 * Fix +redirect{}. Didn't work with -fast-redirects.
637 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
638 * Respond with 400 and a short text message
639 * if the client tries to use Privoxy as FTP proxy.
641 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
642 * Make number of retries in case of forwarded-connect problems
643 * a config file option (forwarded-connect-retries) and use 0 as
646 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
647 * Set random(3) seed.
649 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
650 * Follow the OpenBSD port's lead and protect the resolve
651 * functions on OpenBSD as well.
653 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
654 * --user fix. Only use the user as group if no group is specified.
655 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
657 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
658 * Windows service (re-)integration
662 * --install[:service_name]
663 * --uninstall[:service_name]
666 * They work as follows:
667 * --install will create a service for you and then terminate.
668 * By default the service name will be "privoxy" (without the quotes).
669 * However you can run multiple services if you wish, just by adding
670 * a colon and then a name (no spaces).
672 * --uninstall follows the exact same rules a --install.
674 * --service is used when the program is executed by the service
675 * control manager, and in normal circumstances would never be
676 * used as a command line argument.
678 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
679 * Windows service integration
681 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
682 * Incorporate Fabian Keil's patch work:
683 http://www.fabiankeil.de/sourcecode/privoxy/
685 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
686 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
687 * with what was really the latest development (the v_3_0_branch branch)
689 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
690 * Thanks to Jindrich Makovicka for a race condition fix for the log
691 * file. The race condition remains for non-pthread implementations.
692 * Reference patch #1175720.
694 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
695 * Add the ability to check jpeg images for invalid
696 * lengths of comment blocks. Defensive strategy
697 * against the exploit:
698 * Microsoft Security Bulletin MS04-028
699 * Buffer Overrun in JPEG Processing (GDI+) Could
700 * Allow Code Execution (833987)
701 * Enabled with +inspect-jpegs in actions files.
703 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
704 * - Fixed usage info for non-unix platforms
705 * - Fixed small cmdline parsing bug
707 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
708 * Diagnostics: Now preserve the returncode of pthread_create
709 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
711 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
712 * No longer ignore SIGCHLD. Fixes bug #769381
714 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
715 * Close jarfile on graceful exit, remove stray line
717 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
718 * Cosmetics: Killed a warning, a typo and an allocation left at exit
720 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
721 * No longer rely on non-POSIX.1 extensions of getcwd().
724 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
725 * Replaced setenv() by posix-compliant putenv()
726 * Thanks to Neil McCalden (nmcc AT users.sf.net).
728 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
729 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
731 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
732 * Clean-up and extension of improvements for forked mode:
733 * - Child's return code now consists of flags RC_FLAG_*
734 * - Reporting toggle to parent now properly #ifdef'ed
735 * - Children now report blocking to parent. This enables
736 * statistics in forked mode
738 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
739 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
740 * Children now report having been toggled through _exit(17), parents
741 * watch for that code and toggle themselves if found.
743 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
744 * Wrapping all *_r functions (the non-_r versions of them) with
745 * mutex semaphores for OSX. Hopefully this will take care of all
746 * of those pesky crash reports.
748 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
749 * Fixed two mostly harmless mem leaks
751 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
752 * Fix: Head of global clients list now initialized to NULL
754 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
755 * Added basic support for OPTIONS and TRACE HTTP methods:
756 * - New interceptor direct_response() added in chat().
757 * - sed() moved to earlier in the process, so that the
758 * Host: header is evaluated before actions and forwarding
761 * Revision 1.92 2002/05/08 16:00:46 oes
762 * Chat's buffer handling:
763 * - Fixed bug with unchecked out-of-mem conditions
764 * while reading client request & server headers
765 * - No longer predict if the buffer limit will be exceeded
766 * in the next read -- check add_to_iob's new
767 * return code. If buffer couldn't be extended
768 * (policy or out-of-mem) while
769 * - reading from client: abort
770 * - reading server headers: send error page
771 * - buffering server body for filter: flush,
772 * and if that fails: send error page
774 * Revision 1.91 2002/04/08 20:35:58 swa
777 * Revision 1.90 2002/04/02 14:57:28 oes
778 * Made sending wafers independent of FEATURE_COOKIE_JAR
780 * Revision 1.89 2002/03/31 17:18:59 jongfoster
781 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
783 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
784 * More compiler warning message maintenance
786 * Revision 1.87 2002/03/26 22:29:54 swa
787 * we have a new homepage!
789 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
790 * Workaround for closing the jarfile before load_config() comes around again
792 * Revision 1.85 2002/03/24 15:23:33 jongfoster
795 * Revision 1.84 2002/03/24 13:25:43 swa
796 * name change related issues
798 * Revision 1.83 2002/03/16 23:54:06 jongfoster
799 * Adding graceful termination feature, to help look for memory leaks.
800 * If you enable this (which, by design, has to be done by hand
801 * editing config.h) and then go to http://i.j.b/die, then the program
802 * will exit cleanly after the *next* request. It should free all the
803 * memory that was used.
805 * Revision 1.82 2002/03/13 00:27:05 jongfoster
808 * Revision 1.81 2002/03/12 01:42:50 oes
809 * Introduced modular filters
811 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
812 * OS/2 port maintenance:
813 * - Fixed EMX build - it had decayed a little
814 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
815 * substituted a memset for now.
817 * Revision 1.79 2002/03/09 20:03:52 jongfoster
818 * - Making various functions return int rather than size_t.
819 * (Undoing a recent change). Since size_t is unsigned on
820 * Windows, functions like read_socket that return -1 on
821 * error cannot return a size_t.
823 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
824 * crashes, and also frequently caused JB to jump to 100%
825 * CPU and stay there. (Because it thought it had just
826 * read ((unsigned)-1) == 4Gb of data...)
828 * - The signature of write_socket has changed, it now simply
829 * returns success=0/failure=nonzero.
831 * - Trying to get rid of a few warnings --with-debug on
832 * Windows, I've introduced a new type "jb_socket". This is
833 * used for the socket file descriptors. On Windows, this
834 * is SOCKET (a typedef for unsigned). Everywhere else, it's
835 * an int. The error value can't be -1 any more, so it's
836 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
837 * Windows it maps to the #define INVALID_SOCKET.)
839 * - The signature of bind_port has changed.
841 * Revision 1.78 2002/03/08 21:35:04 oes
842 * Added optional group supplement to --user option. Will now use default group of user if no group given
844 * Revision 1.77 2002/03/07 03:52:06 oes
845 * - Fixed compiler warnings etc
846 * - Improved handling of failed DNS lookups
848 * Revision 1.76 2002/03/06 22:54:35 jongfoster
849 * Automated function-comment nitpicking.
851 * Revision 1.75 2002/03/06 10:02:19 oes
852 * Fixed stupid bug when --user was not given
854 * Revision 1.74 2002/03/06 00:49:31 jongfoster
855 * Fixing warning on Windows
856 * Making #ifdefs that refer to the same variable consistently
857 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
859 * Revision 1.73 2002/03/05 23:57:30 hal9
860 * Stray character 's' on line 1618 was breaking build.
862 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
863 * - Re-enable OS/2 building after new parms were added
864 * - Fix false out of memory report when resolving CGI templates when no IP
865 * address is available of failed attempt (a la no such domain)
867 * Revision 1.71 2002/03/05 18:13:56 oes
868 * Added --user option
870 * Revision 1.70 2002/03/05 04:52:42 oes
871 * Deleted non-errlog debugging code
873 * Revision 1.69 2002/03/04 23:50:00 jongfoster
874 * Splitting off bind_port() call into bind_port_helper(), with
877 * Revision 1.68 2002/03/04 20:17:32 oes
880 * Revision 1.67 2002/03/04 18:18:57 oes
881 * - Removed _DEBUG mode
882 * - Cleand up cmdline parsing
883 * - Introduced --no-daemon, --pidfile options
884 * - Cleaned up signal handling:
885 * - Terminate cleanly on INT, TERM and ABRT
886 * - Schedule logfile for re-opening on HUP
887 * - Ignore CHLD and PIPE
888 * - Leave the rest with their default handlers
889 * - Uniform handler registration
890 * - Added usage() function
891 * - Played styleguide police
893 * Revision 1.66 2002/03/03 15:06:55 oes
894 * Re-enabled automatic config reloading
896 * Revision 1.65 2002/03/03 14:49:11 oes
897 * Fixed CLF logging: Now uses client's original HTTP request
899 * Revision 1.64 2002/03/03 09:18:03 joergs
900 * Made jumbjuster work on AmigaOS again.
902 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
903 * Clean up a little CRLF unpleasantness that suddenly appeared
905 * Revision 1.62 2002/02/20 23:17:23 jongfoster
906 * Detecting some out-of memory conditions and exiting with a log message.
908 * Revision 1.61 2002/01/17 21:01:52 jongfoster
909 * Moving all our URL and URL pattern parsing code to urlmatch.c.
911 * Revision 1.60 2001/12/30 14:07:32 steudten
912 * - Add signal handling (unix)
913 * - Add SIGHUP handler (unix)
914 * - Add creation of pidfile (unix)
915 * - Add action 'top' in rc file (RH)
916 * - Add entry 'SIGNALS' to manpage
917 * - Add exit message to logfile (unix)
919 * Revision 1.59 2001/12/13 14:07:18 oes
920 * Fixed Bug: 503 error page now sent OK
922 * Revision 1.58 2001/11/30 23:37:24 jongfoster
923 * Renaming the Win32 config file to config.txt - this is almost the
924 * same as the corresponding UNIX name "config"
926 * Revision 1.57 2001/11/16 00:47:43 jongfoster
927 * Changing the tty-disconnection code to use setsid().
929 * Revision 1.56 2001/11/13 20:20:54 jongfoster
930 * Tabs->spaces, fixing a bug with missing {} around an if()
932 * Revision 1.55 2001/11/13 20:14:53 jongfoster
933 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
935 * Revision 1.54 2001/11/07 00:03:14 steudten
936 * Give reliable return value if an error
937 * occurs not just 0 with new daemon mode.
939 * Revision 1.53 2001/11/05 21:41:43 steudten
940 * Add changes to be a real daemon just for unix os.
941 * (change cwd to /, detach from controlling tty, set
942 * process group and session leader to the own process.
944 * Add some fatal-error log message for failed malloc().
945 * Add '-d' if compiled with 'configure --with-debug' to
946 * enable debug output.
948 * Revision 1.52 2001/10/26 20:11:20 jongfoster
949 * Fixing type mismatch
951 * Revision 1.51 2001/10/26 17:38:28 oes
954 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
955 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
956 * threads to call select() simultaneously. So, it's time to do a real, live,
957 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
958 * (native). Both versions will work, but using __OS2__ offers multi-threading.
960 * Revision 1.49 2001/10/23 21:41:35 jongfoster
961 * Added call to initialize the (statically-allocated of course)
962 * "out of memory" CGI response.
964 * Revision 1.48 2001/10/10 19:56:46 jongfoster
965 * Moving some code that wasn't cookie-related out of an #ifdef
968 * Revision 1.47 2001/10/10 16:44:36 oes
969 * Added CONNECT destination port limitation check
971 * Revision 1.46 2001/10/08 15:17:41 oes
972 * Re-enabled SSL forwarding
974 * Revision 1.45 2001/10/07 15:42:11 oes
975 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
977 * Moved downgrading of the HTTP version from parse_http_request to
978 * chat(), since we can't decide if it is necessary before we have
979 * determined the actions for the URL. The HTTP command is now
980 * *always* re-built so the repairs need no longer be special-cased.
982 * filter_popups now gets a csp pointer so it can raise the new
983 * CSP_FLAG_MODIFIED flag.
987 * Added configurable size limit for the IOB. If the IOB grows so
988 * large that the next read would exceed the limit, the header
989 * is generated, and the header & unfiltered buffer are flushed
990 * to the client. Chat then continues in non-buffering,
991 * non-filtering body mode.
993 * Revision 1.44 2001/10/02 18:13:57 oes
996 * Revision 1.43 2001/10/02 15:32:13 oes
997 * Moved generation of hdr
999 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
1000 * Cleaning up 2 compiler warnings on OS/2.
1002 * Revision 1.41 2001/09/16 17:05:14 jongfoster
1003 * Removing unused #include showarg.h
1005 * Revision 1.40 2001/09/16 15:41:45 jongfoster
1006 * Fixing signed/unsigned comparison warning.
1008 * Revision 1.39 2001/09/16 13:21:27 jongfoster
1009 * Changes to use new list functions.
1011 * Revision 1.38 2001/09/16 13:01:46 jongfoster
1012 * Removing redundant function call that zeroed zalloc()'d memory.
1014 * Revision 1.37 2001/09/10 11:12:24 oes
1015 * Deleted unused variable
1017 * Revision 1.36 2001/09/10 10:56:15 oes
1018 * Silenced compiler warnings
1020 * Revision 1.35 2001/07/31 14:44:22 oes
1021 * Deleted unused size parameter from filter_popups()
1023 * Revision 1.34 2001/07/30 22:08:36 jongfoster
1024 * Tidying up #defines:
1025 * - All feature #defines are now of the form FEATURE_xxx
1026 * - Permanently turned off WIN_GUI_EDIT
1027 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
1029 * Revision 1.33 2001/07/29 19:32:00 jongfoster
1030 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
1032 * Revision 1.32 2001/07/29 18:47:05 jongfoster
1033 * Adding missing #include "loadcfg.h"
1035 * Revision 1.31 2001/07/29 12:17:48 oes
1036 * Applied pthread fix by Paul Lieverse
1038 * Revision 1.30 2001/07/25 22:57:13 jongfoster
1039 * __BEOS__ no longer overrides FEATURE_PTHREAD.
1040 * This is because FEATURE_PTHREAD will soon be widely used, so I
1041 * want to keep it simple.
1043 * Revision 1.29 2001/07/24 12:47:06 oes
1044 * Applied BeOS support update by Eugenia
1046 * Revision 1.28 2001/07/23 13:26:12 oes
1047 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
1049 * Revision 1.27 2001/07/19 19:09:47 haroon
1050 * - Added code to take care of the situation where while processing the first
1051 * server response (which includes the server header), after finding the end
1052 * of the headers we were not looking past the end of the headers for
1053 * content modification. I enabled it for filter_popups.
1054 * Someone else should look to see if other similar operations should be
1055 * done to the discarded portion of the buffer.
1057 * Note 2001/07/20: No, the other content modification mechanisms will process
1058 * the whole iob later anyway. --oes
1060 * Revision 1.26 2001/07/18 12:31:36 oes
1063 * Revision 1.25 2001/07/15 19:43:49 jongfoster
1064 * Supports POSIX threads.
1065 * Also removed some unused #includes.
1067 * Revision 1.24 2001/07/13 14:00:40 oes
1068 * - Generic content modification scheme:
1069 * Each feature has its own applicability flag that is set
1070 * from csp->action->flags.
1071 * Replaced the "filtering" int flag , by a function pointer
1072 * "content_filter" to the function that will do the content
1073 * modification. If it is != NULL, the document will be buffered
1074 * and processed through *content_filter, which must set
1075 * csp->content_length and return a modified copy of the body
1076 * or return NULL (on failiure).
1077 * - Changed csp->is_text to the more generic bitmap csp->content_type
1078 * which can currently take the valued CT_TEXT or CT_GIF
1079 * - Reformatting etc
1080 * - Removed all #ifdef PCRS
1082 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
1083 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
1084 * the `block_acl' call. This prevents a compilation error when the user
1085 * does not wish to use the "ACL" feature.
1087 * Revision 1.22 2001/06/29 21:45:41 oes
1088 * Indentation, CRLF->LF, Tab-> Space
1090 * Revision 1.21 2001/06/29 13:29:36 oes
1091 * - Cleaned up, improved comments
1092 * - Unified all possible interceptors (CGI,
1093 * block, trust, fast_redirect) in one
1094 * place, with one (CGI) answer generation
1095 * mechansim. Much clearer now.
1096 * - Removed the GIF image generation, which
1097 * is now done in filters.c:block_url()
1098 * - Made error conditions like domain lookup
1099 * failiure or (various) problems while talking
1100 * to the server use cgi.c:error_response()
1101 * instead of generating HTML/HTTP in chat() (yuck!)
1102 * - Removed logentry from cancelled commit
1104 * Revision 1.20 2001/06/09 10:55:28 jongfoster
1105 * Changing BUFSIZ ==> BUFFER_SIZE
1107 * Revision 1.19 2001/06/07 23:12:52 jongfoster
1108 * Replacing function pointer in struct gateway with a directly
1109 * called function forwarded_connect().
1110 * Replacing struct gateway with struct forward_spec
1112 * Revision 1.18 2001/06/03 19:12:16 oes
1113 * introduced new cgi handling
1115 * Revision 1.17 2001/06/01 20:07:23 jongfoster
1116 * Now uses action +image-blocker{} rather than config->tinygif
1118 * Revision 1.16 2001/06/01 18:49:17 jongfoster
1119 * Replaced "list_share" with "list" - the tiny memory gain was not
1120 * worth the extra complexity.
1122 * Revision 1.15 2001/05/31 21:24:47 jongfoster
1123 * Changed "permission" to "action" throughout.
1124 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
1125 * Moved vanilla wafer check into chat(), since we must now
1126 * decide whether or not to add it based on the URL.
1128 * Revision 1.14 2001/05/29 20:14:01 joergs
1129 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
1132 * Revision 1.13 2001/05/29 09:50:24 jongfoster
1133 * Unified blocklist/imagelist/permissionslist.
1134 * File format is still under discussion, but the internal changes
1135 * are (mostly) done.
1137 * Also modified interceptor behaviour:
1138 * - We now intercept all URLs beginning with one of the following
1139 * prefixes (and *only* these prefixes):
1141 * * http://ijbswa.sf.net/config/
1142 * * http://ijbswa.sourceforge.net/config/
1143 * - New interceptors "home page" - go to http://i.j.b/ to see it.
1144 * - Internal changes so that intercepted and fast redirect pages
1145 * are not replaced with an image.
1146 * - Interceptors now have the option to send a binary page direct
1147 * to the client. (i.e. ijb-send-banner uses this)
1148 * - Implemented show-url-info interceptor. (Which is why I needed
1149 * the above interceptors changes - a typical URL is
1150 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
1151 * The previous mechanism would not have intercepted that, and
1152 * if it had been intercepted then it then it would have replaced
1153 * it with an image.)
1155 * Revision 1.12 2001/05/27 22:17:04 oes
1157 * - re_process_buffer no longer writes the modified buffer
1158 * to the client, which was very ugly. It now returns the
1159 * buffer, which it is then written by chat.
1161 * - content_length now adjusts the Content-Length: header
1162 * for modified documents rather than crunch()ing it.
1163 * (Length info in csp->content_length, which is 0 for
1164 * unmodified documents)
1166 * - For this to work, sed() is called twice when filtering.
1168 * Revision 1.11 2001/05/26 17:27:53 jongfoster
1169 * Added support for CLF and fixed LOG_LEVEL_LOG.
1170 * Also did CRLF->LF fix of my previous patch.
1172 * Revision 1.10 2001/05/26 15:26:15 jongfoster
1173 * ACL feature now provides more security by immediately dropping
1174 * connections from untrusted hosts.
1176 * Revision 1.9 2001/05/26 00:28:36 jongfoster
1177 * Automatic reloading of config file.
1178 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
1179 * Most of the global variables have been moved to a new
1180 * struct configuration_spec, accessed through csp->config->globalname
1181 * Most of the globals remaining are used by the Win32 GUI.
1183 * Revision 1.8 2001/05/25 22:43:18 jongfoster
1184 * Fixing minor memory leak and buffer overflow.
1186 * Revision 1.7 2001/05/25 22:34:30 jongfoster
1189 * Revision 1.6 2001/05/23 00:13:58 joergs
1190 * AmigaOS support fixed.
1192 * Revision 1.5 2001/05/22 18:46:04 oes
1194 * - Enabled filtering banners by size rather than URL
1195 * by adding patterns that replace all standard banner
1196 * sizes with the "Junkbuster" gif to the re_filterfile
1198 * - Enabled filtering WebBugs by providing a pattern
1199 * which kills all 1x1 images
1201 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
1202 * which is selected by the (nonstandard and therefore
1203 * capital) letter 'U' in the option string.
1204 * It causes the quantifiers to be ungreedy by default.
1205 * Appending a ? turns back to greedy (!).
1207 * - Added a new interceptor ijb-send-banner, which
1208 * sends back the "Junkbuster" gif. Without imagelist or
1209 * MSIE detection support, or if tinygif = 1, or the
1210 * URL isn't recognized as an imageurl, a lame HTML
1211 * explanation is sent instead.
1213 * - Added new feature, which permits blocking remote
1214 * script redirects and firing back a local redirect
1216 * The feature is conditionally compiled, i.e. it
1217 * can be disabled with --disable-fast-redirects,
1218 * plus it must be activated by a "fast-redirects"
1219 * line in the config file, has its own log level
1220 * and of course wants to be displayed by show-proxy-args
1221 * Note: Boy, all the #ifdefs in 1001 locations and
1222 * all the fumbling with configure.in and acconfig.h
1223 * were *way* more work than the feature itself :-(
1225 * - Because a generic redirect template was needed for
1226 * this, tinygif = 3 now uses the same.
1228 * - Moved GIFs, and other static HTTP response templates
1231 * - Some minor fixes
1233 * - Removed some >400 CRs again (Jon, you really worked
1236 * Revision 1.4 2001/05/21 19:34:01 jongfoster
1237 * Made failure to bind() a fatal error.
1239 * Revision 1.3 2001/05/20 01:21:20 jongfoster
1240 * Version 2.9.4 checkin.
1241 * - Merged popupfile and cookiefile, and added control over PCRS
1242 * filtering, in new "permissionsfile".
1243 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
1244 * file error you now get a message box (in the Win32 GUI) rather
1245 * than the program exiting with no explanation.
1246 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
1248 * - Removed tabs from "config"
1249 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
1250 * - Bumped up version number.
1252 * Revision 1.2 2001/05/17 22:34:44 oes
1253 * - Added hint on GIF char array generation to jcc.c
1254 * - Cleaned CRLF's from the sources and related files
1255 * - Repaired logging for REF and FRC
1257 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
1258 * Initial import of version 2.9.3 source tree
1261 *********************************************************************/
1267 #include <sys/types.h>
1276 # ifndef FEATURE_PTHREAD
1280 # include <windows.h>
1281 # include <process.h>
1282 # endif /* ndef FEATURE_PTHREAD */
1285 # ifndef _WIN_CONSOLE
1286 # include "w32log.h"
1287 # endif /* ndef _WIN_CONSOLE */
1288 # include "w32svrapi.h"
1290 #else /* ifndef _WIN32 */
1292 # if !defined (__OS2__)
1293 # include <unistd.h>
1294 # include <sys/wait.h>
1295 # endif /* ndef __OS2__ */
1296 # include <sys/time.h>
1297 # include <sys/stat.h>
1298 # include <sys/ioctl.h>
1301 #include <sys/termios.h>
1309 # include <signal.h>
1312 # include <socket.h> /* BeOS has select() for sockets only. */
1313 # include <OS.h> /* declarations for threads and stuff. */
1316 # if defined(__EMX__) || defined(__OS2__)
1317 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1322 #define bzero(B,N) memset(B,0x00,n)
1326 # include <select.h>
1331 #include "project.h"
1334 #include "filters.h"
1335 #include "loaders.h"
1336 #include "parsers.h"
1337 #include "miscutil.h"
1339 #include "jbsockets.h"
1340 #include "gateway.h"
1341 #include "actions.h"
1343 #include "loadcfg.h"
1344 #include "urlmatch.h"
1346 const char jcc_h_rcs[] = JCC_H_VERSION;
1347 const char project_h_rcs[] = PROJECT_H_VERSION;
1350 struct client_state clients[1];
1351 struct file_list files[1];
1353 #ifdef FEATURE_STATISTICS
1354 int urls_read = 0; /* total nr of urls read inc rejected */
1355 int urls_rejected = 0; /* total nr of urls rejected */
1356 #endif /* def FEATURE_STATISTICS */
1358 #ifdef FEATURE_GRACEFUL_TERMINATION
1359 int g_terminate = 0;
1362 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1363 static void sig_handler(int the_signal);
1365 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1366 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1367 static jb_err get_server_headers(struct client_state *csp);
1368 static const char *crunch_reason(const struct http_response *rsp);
1369 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
1370 static char *get_request_line(struct client_state *csp);
1371 static jb_err receive_client_request(struct client_state *csp);
1372 static jb_err parse_client_request(struct client_state *csp);
1373 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1374 static jb_err change_request_destination(struct client_state *csp);
1375 static void chat(struct client_state *csp);
1376 static void serve(struct client_state *csp);
1377 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1378 static void usage(const char *myname);
1380 static void initialize_mutexes(void);
1381 static jb_socket bind_port_helper(struct configuration_spec *config);
1382 static void listen_loop(void);
1385 void serve(struct client_state *csp);
1386 #else /* ifndef AMIGA */
1387 static void serve(struct client_state *csp);
1388 #endif /* def AMIGA */
1391 static int32 server_thread(void *data);
1392 #endif /* def __BEOS__ */
1395 #define sleep(N) Sleep(((N) * 1000))
1399 #define sleep(N) DosSleep(((N) * 100))
1402 #ifdef MUTEX_LOCKS_AVAILABLE
1404 * XXX: Does the locking stuff really belong in this file?
1406 privoxy_mutex_t log_mutex;
1407 privoxy_mutex_t log_init_mutex;
1408 privoxy_mutex_t connection_reuse_mutex;
1410 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1411 privoxy_mutex_t resolver_mutex;
1412 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1414 #ifndef HAVE_GMTIME_R
1415 privoxy_mutex_t gmtime_mutex;
1416 #endif /* ndef HAVE_GMTIME_R */
1418 #ifndef HAVE_LOCALTIME_R
1419 privoxy_mutex_t localtime_mutex;
1420 #endif /* ndef HAVE_GMTIME_R */
1423 privoxy_mutex_t rand_mutex;
1424 #endif /* ndef HAVE_RANDOM */
1426 #endif /* def MUTEX_LOCKS_AVAILABLE */
1429 const char *basedir = NULL;
1430 const char *pidfile = NULL;
1431 static int received_hup_signal = 0;
1432 #endif /* defined unix */
1434 /* HTTP snipplets. */
1435 static const char CSUCCEED[] =
1436 "HTTP/1.0 200 Connection established\r\n"
1437 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1439 static const char CHEADER[] =
1440 "HTTP/1.0 400 Invalid header received from client\r\n"
1441 "Proxy-Agent: Privoxy " VERSION "\r\n"
1442 "Content-Type: text/plain\r\n"
1443 "Connection: close\r\n\r\n"
1444 "Invalid header received from client.\r\n";
1446 static const char FTP_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 FTP.\r\n";
1452 static const char GOPHER_RESPONSE[] =
1453 "HTTP/1.0 400 Invalid request received from client\r\n"
1454 "Content-Type: text/plain\r\n"
1455 "Connection: close\r\n\r\n"
1456 "Invalid request. Privoxy doesn't support gopher.\r\n";
1458 /* XXX: should be a template */
1459 static const char MISSING_DESTINATION_RESPONSE[] =
1460 "HTTP/1.0 400 Bad request received from client\r\n"
1461 "Proxy-Agent: Privoxy " VERSION "\r\n"
1462 "Content-Type: text/plain\r\n"
1463 "Connection: close\r\n\r\n"
1464 "Bad request. Privoxy was unable to extract the destination.\r\n";
1466 /* XXX: should be a template */
1467 static const char NO_SERVER_DATA_RESPONSE[] =
1468 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1469 "Proxy-Agent: Privoxy " VERSION "\r\n"
1470 "Content-Type: text/plain\r\n"
1471 "Connection: close\r\n\r\n"
1472 "Empty server or forwarder response.\r\n"
1473 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1475 /* XXX: should be a template */
1476 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1477 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1478 "Proxy-Agent: Privoxy " VERSION "\r\n"
1479 "Content-Type: text/plain\r\n"
1480 "Connection: close\r\n\r\n"
1481 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1484 /* XXX: should be a template */
1485 static const char NULL_BYTE_RESPONSE[] =
1486 "HTTP/1.0 400 Bad request received from client\r\n"
1487 "Proxy-Agent: Privoxy " VERSION "\r\n"
1488 "Content-Type: text/plain\r\n"
1489 "Connection: close\r\n\r\n"
1490 "Bad request. Null byte(s) before end of request.\r\n";
1493 /* XXX: should be a template */
1494 static const char MESSED_UP_REQUEST_RESPONSE[] =
1495 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1496 "Proxy-Agent: Privoxy " VERSION "\r\n"
1497 "Content-Type: text/plain\r\n"
1498 "Connection: close\r\n\r\n"
1499 "Bad request. Messed up with header filters.\r\n";
1501 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
1502 "HTTP/1.0 503 Too many open connections\r\n"
1503 "Proxy-Agent: Privoxy " VERSION "\r\n"
1504 "Content-Type: text/plain\r\n"
1505 "Connection: close\r\n\r\n"
1506 "Maximum number of open connections reached.\r\n";
1508 /* XXX: should be a template */
1509 static const char CONNECTION_TIMEOUT_RESPONSE[] =
1510 "HTTP/1.0 504 Connection timeout\r\n"
1511 "Proxy-Agent: Privoxy " VERSION "\r\n"
1512 "Content-Type: text/plain\r\n"
1513 "Connection: close\r\n\r\n"
1514 "The connection timed out.\r\n";
1516 /* A function to crunch a response */
1517 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1519 /* Crunch function flags */
1520 #define CF_NO_FLAGS 0
1521 /* Cruncher applies to forced requests as well */
1522 #define CF_IGNORE_FORCE 1
1523 /* Crunched requests are counted for the block statistics */
1524 #define CF_COUNT_AS_REJECT 2
1526 /* A crunch function and its flags */
1529 const crunch_func_ptr cruncher;
1533 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1535 /* Complete list of cruncher functions */
1536 static const struct cruncher crunchers_all[] = {
1537 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1538 { block_url, CF_COUNT_AS_REJECT },
1539 #ifdef FEATURE_TRUST
1540 { trust_url, CF_COUNT_AS_REJECT },
1541 #endif /* def FEATURE_TRUST */
1542 { redirect_url, CF_NO_FLAGS },
1543 { dispatch_cgi, CF_IGNORE_FORCE},
1547 /* Light version, used after tags are applied */
1548 static const struct cruncher crunchers_light[] = {
1549 { block_url, CF_COUNT_AS_REJECT },
1550 { redirect_url, CF_NO_FLAGS },
1556 * XXX: Don't we really mean
1562 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1563 /*********************************************************************
1565 * Function : sig_handler
1567 * Description : Signal handler for different signals.
1568 * Exit gracefully on TERM and INT
1569 * or set a flag that will cause the errlog
1570 * to be reopened by the main thread on HUP.
1573 * 1 : the_signal = the signal cause this function to call
1577 *********************************************************************/
1578 static void sig_handler(int the_signal)
1584 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1596 received_hup_signal = 1;
1602 * We shouldn't be here, unless we catch signals
1603 * in main() that we can't handle here!
1605 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1613 /*********************************************************************
1615 * Function : client_protocol_is_unsupported
1617 * Description : Checks if the client used a known unsupported
1618 * protocol and deals with it by sending an error
1622 * 1 : csp = Current client state (buffers, headers, etc...)
1623 * 2 : req = the first request line send by the client
1625 * Returns : TRUE if an error response has been generated, or
1626 * FALSE if the request doesn't look invalid.
1628 *********************************************************************/
1629 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1632 * If it's a FTP or gopher request, we don't support it.
1634 * These checks are better than nothing, but they might
1635 * not work in all configurations and some clients might
1636 * have problems digesting the answer.
1638 * They should, however, never cause more problems than
1639 * Privoxy's old behaviour (returning the misleading HTML
1642 * "Could not resolve http://(ftp|gopher)://example.org").
1644 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1646 const char *response = NULL;
1647 const char *protocol = NULL;
1649 if (!strncmpic(req, "GET ftp://", 10))
1651 response = FTP_RESPONSE;
1656 response = GOPHER_RESPONSE;
1657 protocol = "GOPHER";
1659 log_error(LOG_LEVEL_ERROR,
1660 "%s tried to use Privoxy as %s proxy: %s",
1661 csp->ip_addr_str, protocol, req);
1662 log_error(LOG_LEVEL_CLF,
1663 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1665 write_socket(csp->cfd, response, strlen(response));
1674 /*********************************************************************
1676 * Function : get_request_destination_elsewhere
1678 * Description : If the client's request was redirected into
1679 * Privoxy without the client's knowledge,
1680 * the request line lacks the destination host.
1682 * This function tries to get it elsewhere,
1683 * provided accept-intercepted-requests is enabled.
1685 * "Elsewhere" currently only means "Host: header",
1686 * but in the future we may ask the redirecting
1687 * packet filter to look the destination up.
1689 * If the destination stays unknown, an error
1690 * response is send to the client and headers
1691 * are freed so that chat() can return directly.
1694 * 1 : csp = Current client state (buffers, headers, etc...)
1695 * 2 : headers = a header list
1697 * Returns : JB_ERR_OK if the destination is now known, or
1698 * JB_ERR_PARSE if it isn't.
1700 *********************************************************************/
1701 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1705 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1707 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1708 " Privoxy isn't configured to accept intercepted requests.",
1709 csp->ip_addr_str, csp->http->cmd);
1710 /* XXX: Use correct size */
1711 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1712 csp->ip_addr_str, csp->http->cmd);
1714 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1715 destroy_list(headers);
1717 return JB_ERR_PARSE;
1719 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1721 /* Split the domain we just got for pattern matching */
1722 init_domain_components(csp->http);
1728 /* We can't work without destination. Go spread the news.*/
1730 req = list_to_text(headers);
1732 /* XXX: Use correct size */
1733 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1734 csp->ip_addr_str, csp->http->cmd);
1735 log_error(LOG_LEVEL_ERROR,
1736 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1737 csp->ip_addr_str, csp->http->cmd, req);
1740 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1741 destroy_list(headers);
1743 return JB_ERR_PARSE;
1746 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1747 * to get the destination IP address, use it as host directly
1748 * or do a reverse DNS lookup first.
1753 /*********************************************************************
1755 * Function : get_server_headers
1757 * Description : Parses server headers in iob and fills them
1758 * into csp->headers so that they can later be
1762 * 1 : csp = Current client state (buffers, headers, etc...)
1764 * Returns : JB_ERR_OK if everything went fine, or
1765 * JB_ERR_PARSE if the headers were incomplete.
1767 *********************************************************************/
1768 static jb_err get_server_headers(struct client_state *csp)
1770 int continue_hack_in_da_house = 0;
1773 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1778 * continue hack in da house. Ignore the ending of
1779 * this head and continue enlisting header lines.
1780 * The reason is described below.
1782 enlist(csp->headers, "");
1783 continue_hack_in_da_house = 0;
1786 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1789 * It's a bodyless continue response, don't
1790 * stop header parsing after reaching its end.
1792 * As a result Privoxy will concatenate the
1793 * next response's head and parse and deliver
1794 * the headers as if they belonged to one request.
1796 * The client will separate them because of the
1797 * empty line between them.
1799 * XXX: What we're doing here is clearly against
1800 * the intended purpose of the continue header,
1801 * and under some conditions (HTTP/1.0 client request)
1802 * it's a standard violation.
1804 * Anyway, "sort of against the spec" is preferable
1805 * to "always getting confused by Continue responses"
1806 * (Privoxy's behaviour before this hack was added)
1808 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1809 continue_hack_in_da_house = 1;
1811 else if (*header == '\0')
1814 * If the header is empty, but the Continue hack
1815 * isn't active, we can assume that we reached the
1816 * end of the buffer before we hit the end of the
1819 * Inform the caller an let it decide how to handle it.
1821 return JB_ERR_PARSE;
1824 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1827 * XXX: Should we quit the request and return a
1828 * out of memory error page instead?
1830 log_error(LOG_LEVEL_ERROR,
1831 "Out of memory while enlisting server headers. %s lost.",
1841 /*********************************************************************
1843 * Function : crunch_reason
1845 * Description : Translates the crunch reason code into a string.
1848 * 1 : rsp = a http_response
1850 * Returns : A string with the crunch reason or an error description.
1852 *********************************************************************/
1853 static const char *crunch_reason(const struct http_response *rsp)
1855 char * reason = NULL;
1857 assert(rsp != NULL);
1860 return "Internal error while searching for crunch reason";
1863 switch (rsp->reason)
1865 case RSP_REASON_UNSUPPORTED:
1866 reason = "Unsupported HTTP feature";
1868 case RSP_REASON_BLOCKED:
1871 case RSP_REASON_UNTRUSTED:
1872 reason = "Untrusted";
1874 case RSP_REASON_REDIRECTED:
1875 reason = "Redirected";
1877 case RSP_REASON_CGI_CALL:
1878 reason = "CGI Call";
1880 case RSP_REASON_NO_SUCH_DOMAIN:
1881 reason = "DNS failure";
1883 case RSP_REASON_FORWARDING_FAILED:
1884 reason = "Forwarding failed";
1886 case RSP_REASON_CONNECT_FAILED:
1887 reason = "Connection failure";
1889 case RSP_REASON_OUT_OF_MEMORY:
1890 reason = "Out of memory (may mask other reasons)";
1893 reason = "No reason recorded";
1901 /*********************************************************************
1903 * Function : send_crunch_response
1905 * Description : Delivers already prepared response for
1906 * intercepted requests, logs the interception
1907 * and frees the response.
1910 * 1 : csp = Current client state (buffers, headers, etc...)
1911 * 1 : rsp = Fully prepared response. Will be freed on exit.
1913 * Returns : Nothing.
1915 *********************************************************************/
1916 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
1918 const struct http_request *http = csp->http;
1919 char status_code[4];
1921 assert(rsp != NULL);
1922 assert(rsp->head != NULL);
1927 * Not supposed to happen. If it does
1928 * anyway, treat it as an unknown error.
1930 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1931 /* return code doesn't matter */
1936 /* If rsp is still NULL, we have serious internal problems. */
1937 log_error(LOG_LEVEL_FATAL,
1938 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1942 * Extract the status code from the actual head
1943 * that was send to the client. It is the only
1944 * way to get it right for all requests, including
1945 * the fixed ones for out-of-memory problems.
1947 * A head starts like this: 'HTTP/1.1 200...'
1951 status_code[0] = rsp->head[9];
1952 status_code[1] = rsp->head[10];
1953 status_code[2] = rsp->head[11];
1954 status_code[3] = '\0';
1956 /* Write the answer to the client */
1957 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1958 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1960 /* There is nothing we can do about it. */
1961 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1964 /* Log that the request was crunched and why. */
1965 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
1966 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
1967 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1969 /* Clean up and return */
1970 if (cgi_error_memory() != rsp)
1972 free_http_response(rsp);
1979 /*********************************************************************
1981 * Function : request_contains_null_bytes
1983 * Description : Checks for NULL bytes in the request and sends
1984 * an error message to the client if any were found.
1986 * XXX: currently not used, see comment in chat().
1989 * 1 : csp = Current client state (buffers, headers, etc...)
1990 * 2 : buf = Data from the client's request to check.
1991 * 3 : len = The data length.
1993 * Returns : TRUE if the request contained one or more NULL bytes, or
1996 *********************************************************************/
1997 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1999 size_t c_len; /* Request lenght when treated as C string */
2001 c_len = strlen(buf);
2006 * Null byte(s) found. Log the request,
2007 * return an error response and hang up.
2009 size_t tmp_len = c_len;
2014 * Replace NULL byte(s) with '°' characters
2015 * so the request can be logged as string.
2016 * XXX: Is there a better replacement character?
2019 tmp_len += strlen(buf+tmp_len);
2020 } while (tmp_len < len);
2022 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
2023 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
2024 log_error(LOG_LEVEL_HEADER,
2025 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
2027 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
2029 /* XXX: Log correct size */
2030 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2040 /*********************************************************************
2042 * Function : crunch_response_triggered
2044 * Description : Checks if the request has to be crunched,
2045 * and delivers the crunch response if necessary.
2048 * 1 : csp = Current client state (buffers, headers, etc...)
2049 * 2 : crunchers = list of cruncher functions to run
2051 * Returns : TRUE if the request was answered with a crunch response
2054 *********************************************************************/
2055 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
2057 struct http_response *rsp = NULL;
2058 const struct cruncher *c;
2061 * If CGI request crunching is disabled,
2062 * check the CGI dispatcher out of order to
2063 * prevent unintentional blocks or redirects.
2065 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
2066 && (NULL != (rsp = dispatch_cgi(csp))))
2068 /* Deliver, log and free the interception response. */
2069 send_crunch_response(csp, rsp);
2073 for (c = crunchers; c->cruncher != NULL; c++)
2076 * Check the cruncher if either Privoxy is toggled
2077 * on and the request isn't forced, or if the cruncher
2078 * applies to forced requests as well.
2080 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
2081 !(csp->flags & CSP_FLAG_FORCED)) ||
2082 (c->flags & CF_IGNORE_FORCE))
2084 rsp = c->cruncher(csp);
2087 /* Deliver, log and free the interception response. */
2088 send_crunch_response(csp, rsp);
2089 #ifdef FEATURE_STATISTICS
2090 if (c->flags & CF_COUNT_AS_REJECT)
2092 csp->flags |= CSP_FLAG_REJECTED;
2094 #endif /* def FEATURE_STATISTICS */
2105 /*********************************************************************
2107 * Function : build_request_line
2109 * Description : Builds the HTTP request line.
2111 * If a HTTP forwarder is used it expects the whole URL,
2112 * web servers only get the path.
2115 * 1 : csp = Current client state (buffers, headers, etc...)
2116 * 2 : fwd = The forwarding spec used for the request
2117 * XXX: Should use http->fwd instead.
2118 * 3 : request_line = The old request line which will be replaced.
2120 * Returns : Nothing. Terminates in case of memory problems.
2122 *********************************************************************/
2123 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
2125 struct http_request *http = csp->http;
2127 assert(http->ssl == 0);
2130 * Downgrade http version from 1.1 to 1.0
2131 * if +downgrade action applies.
2133 if ( (csp->action->flags & ACTION_DOWNGRADE)
2134 && (!strcmpic(http->ver, "HTTP/1.1")))
2137 http->ver = strdup("HTTP/1.0");
2139 if (http->ver == NULL)
2141 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
2146 * Rebuild the request line.
2148 freez(*request_line);
2149 *request_line = strdup(http->gpc);
2150 string_append(request_line, " ");
2152 if (fwd->forward_host)
2154 string_append(request_line, http->url);
2158 string_append(request_line, http->path);
2160 string_append(request_line, " ");
2161 string_append(request_line, http->ver);
2163 if (*request_line == NULL)
2165 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
2167 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
2171 /*********************************************************************
2173 * Function : change_request_destination
2175 * Description : Parse a (rewritten) request line and regenerate
2176 * the http request data.
2179 * 1 : csp = Current client state (buffers, headers, etc...)
2181 * Returns : Forwards the parse_http_request() return code.
2182 * Terminates in case of memory problems.
2184 *********************************************************************/
2185 static jb_err change_request_destination(struct client_state *csp)
2187 struct http_request *http = csp->http;
2190 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
2191 free_http_request(http);
2192 err = parse_http_request(csp->headers->first->str, http);
2193 if (JB_ERR_OK != err)
2195 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2196 jb_err_to_string(err));
2200 /* XXX: ocmd is a misleading name */
2201 http->ocmd = strdup(http->cmd);
2202 if (http->ocmd == NULL)
2204 log_error(LOG_LEVEL_FATAL,
2205 "Out of memory copying rewritten HTTP request line");
2213 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2214 /*********************************************************************
2216 * Function : server_response_is_complete
2218 * Description : Determines whether we should stop reading
2219 * from the server socket.
2222 * 1 : csp = Current client state (buffers, headers, etc...)
2223 * 2 : content_length = Length of content received so far.
2225 * Returns : TRUE if the response is complete,
2228 *********************************************************************/
2229 static int server_response_is_complete(struct client_state *csp,
2230 unsigned long long content_length)
2232 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
2234 if (!strcmpic(csp->http->gpc, "HEAD"))
2237 * "HEAD" implies no body, we are thus expecting
2238 * no content. XXX: incomplete "list" of methods?
2240 csp->expected_content_length = 0;
2241 content_length_known = TRUE;
2244 if (csp->http->status == 304)
2247 * Expect no body. XXX: incomplete "list" of status codes?
2249 csp->expected_content_length = 0;
2250 content_length_known = TRUE;
2253 return (content_length_known && ((0 == csp->expected_content_length)
2254 || (csp->expected_content_length <= content_length)));
2258 /*********************************************************************
2260 * Function : wait_for_alive_connections
2262 * Description : Waits for alive connections to timeout.
2268 *********************************************************************/
2269 static void wait_for_alive_connections()
2271 int connections_alive = close_unusable_connections();
2273 while (0 < connections_alive)
2275 log_error(LOG_LEVEL_CONNECT,
2276 "Waiting for %d connections to timeout.",
2279 connections_alive = close_unusable_connections();
2282 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
2285 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2288 /*********************************************************************
2290 * Function : mark_server_socket_tainted
2292 * Description : Makes sure we don't reuse a server socket
2293 * (if we didn't read everything the server sent
2294 * us reusing the socket would lead to garbage).
2297 * 1 : csp = Current client state (buffers, headers, etc...)
2301 *********************************************************************/
2302 static void mark_server_socket_tainted(struct client_state *csp)
2304 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
2306 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
2307 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
2311 /*********************************************************************
2313 * Function : get_request_line
2315 * Description : Read the client request line.
2318 * 1 : csp = Current client state (buffers, headers, etc...)
2320 * Returns : Pointer to request line or NULL in case of errors.
2322 *********************************************************************/
2323 static char *get_request_line(struct client_state *csp)
2325 char buf[BUFFER_SIZE];
2326 char *request_line = NULL;
2329 memset(buf, 0, sizeof(buf));
2333 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2335 log_error(LOG_LEVEL_ERROR,
2336 "Stopped waiting for the request line.");
2337 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2338 strlen(CONNECTION_TIMEOUT_RESPONSE));
2342 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2344 if (len <= 0) return NULL;
2347 * If there is no memory left for buffering the
2348 * request, there is nothing we can do but hang up
2350 if (add_to_iob(csp, buf, len))
2355 request_line = get_header(csp->iob);
2357 } while ((NULL != request_line) && ('\0' == *request_line));
2359 return request_line;
2364 /*********************************************************************
2366 * Function : receive_client_request
2368 * Description : Read the client's request (more precisely the
2369 * client headers) and answer it if necessary.
2371 * Note that since we're not using select() we could get
2372 * blocked here if a client connected, then didn't say
2376 * 1 : csp = Current client state (buffers, headers, etc...)
2378 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
2380 *********************************************************************/
2381 static jb_err receive_client_request(struct client_state *csp)
2383 char buf[BUFFER_SIZE];
2386 struct http_request *http;
2390 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
2391 struct list header_list;
2392 struct list *headers = &header_list;
2396 memset(buf, 0, sizeof(buf));
2398 req = get_request_line(csp);
2401 return JB_ERR_PARSE;
2403 assert(*req != '\0');
2405 if (client_protocol_is_unsupported(csp, req))
2407 return JB_ERR_PARSE;
2410 #ifdef FEATURE_FORCE_LOAD
2412 * If this request contains the FORCE_PREFIX and blocks
2413 * aren't enforced, get rid of it and set the force flag.
2415 if (strstr(req, FORCE_PREFIX))
2417 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2419 log_error(LOG_LEVEL_FORCE,
2420 "Ignored force prefix in request: \"%s\".", req);
2424 strclean(req, FORCE_PREFIX);
2425 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2426 csp->flags |= CSP_FLAG_FORCED;
2429 #endif /* def FEATURE_FORCE_LOAD */
2431 err = parse_http_request(req, http);
2433 if (JB_ERR_OK != err)
2435 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2436 /* XXX: Use correct size */
2437 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2438 log_error(LOG_LEVEL_ERROR,
2439 "Couldn't parse request line received from %s: %s",
2440 csp->ip_addr_str, jb_err_to_string(err));
2442 free_http_request(http);
2443 return JB_ERR_PARSE;
2446 /* grab the rest of the client's headers */
2450 p = get_header(csp->iob);
2454 /* There are no additional headers to read. */
2461 * We didn't receive a complete header
2462 * line yet, get the rest of it.
2464 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2466 log_error(LOG_LEVEL_ERROR,
2467 "Stopped grabbing the client headers.");
2468 return JB_ERR_PARSE;
2471 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2474 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2475 destroy_list(headers);
2476 return JB_ERR_PARSE;
2479 if (add_to_iob(csp, buf, len))
2482 * If there is no memory left for buffering the
2483 * request, there is nothing we can do but hang up
2485 destroy_list(headers);
2486 return JB_ERR_MEMORY;
2492 * We were able to read a complete
2493 * header and can finaly enlist it.
2500 if (http->host == NULL)
2503 * If we still don't know the request destination,
2504 * the request is invalid or the client uses
2505 * Privoxy without its knowledge.
2507 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2510 * Our attempts to get the request destination
2511 * elsewhere failed or Privoxy is configured
2512 * to only accept proxy requests.
2514 * An error response has already been send
2515 * and we're done here.
2517 return JB_ERR_PARSE;
2522 * Determine the actions for this URL
2524 #ifdef FEATURE_TOGGLE
2525 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2527 /* Most compatible set of actions (i.e. none) */
2528 init_current_action(csp->action);
2531 #endif /* ndef FEATURE_TOGGLE */
2533 get_url_actions(csp, http);
2537 * Save a copy of the original request for logging
2539 http->ocmd = strdup(http->cmd);
2540 if (http->ocmd == NULL)
2542 log_error(LOG_LEVEL_FATAL,
2543 "Out of memory copying HTTP request line");
2545 enlist(csp->headers, http->cmd);
2547 /* Append the previously read headers */
2548 list_append_list_unique(csp->headers, headers);
2549 destroy_list(headers);
2556 /*********************************************************************
2558 * Function : parse_client_request
2560 * Description : Parses the client's request and decides what to do
2563 * Note that since we're not using select() we could get
2564 * blocked here if a client connected, then didn't say
2568 * 1 : csp = Current client state (buffers, headers, etc...)
2570 * Returns : JB_ERR_OK or JB_ERR_PARSE
2572 *********************************************************************/
2573 static jb_err parse_client_request(struct client_state *csp)
2575 struct http_request *http = csp->http;
2578 err = sed(csp, FILTER_CLIENT_HEADERS);
2579 if (JB_ERR_OK != err)
2581 /* XXX: Should be handled in sed(). */
2582 assert(err == JB_ERR_PARSE);
2583 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
2585 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2587 /* Check request line for rewrites. */
2588 if ((NULL == csp->headers->first->str)
2589 || (strcmp(http->cmd, csp->headers->first->str) &&
2590 (JB_ERR_OK != change_request_destination(csp))))
2593 * A header filter broke the request line - bail out.
2595 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2596 /* XXX: Use correct size */
2597 log_error(LOG_LEVEL_CLF,
2598 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2599 log_error(LOG_LEVEL_ERROR,
2600 "Invalid request line after applying header filters.");
2601 free_http_request(http);
2603 return JB_ERR_PARSE;
2611 /*********************************************************************
2615 * Description : Once a connection to the client has been accepted,
2616 * this function is called (via serve()) to handle the
2617 * main business of the communication. When this
2618 * function returns, the caller must close the client
2621 * FIXME: chat is nearly thousand lines long.
2625 * 1 : csp = Current client state (buffers, headers, etc...)
2627 * Returns : Nothing.
2629 *********************************************************************/
2630 static void chat(struct client_state *csp)
2632 char buf[BUFFER_SIZE];
2639 int ms_iis5_hack = 0;
2640 unsigned long long byte_count = 0;
2641 int forwarded_connect_retries = 0;
2642 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
2643 const struct forward_spec *fwd;
2644 struct http_request *http;
2645 long len = 0; /* for buffer sizes (and negative error codes) */
2647 /* Function that does the content filtering for the current request */
2648 filter_function_ptr content_filter = NULL;
2650 /* Skeleton for HTTP response, if we should intercept the request */
2651 struct http_response *rsp;
2652 struct timeval timeout;
2654 memset(buf, 0, sizeof(buf));
2658 if (receive_client_request(csp) != JB_ERR_OK)
2662 if (parse_client_request(csp) != JB_ERR_OK)
2667 /* decide how to route the HTTP request */
2668 fwd = forward_url(csp, http);
2671 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2672 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2677 * build the http request to send to the server
2678 * we have to do one of the following:
2680 * create = use the original HTTP request to create a new
2681 * HTTP request that has either the path component
2682 * without the http://domainspec (w/path) or the
2683 * full orininal URL (w/url)
2684 * Note that the path and/or the HTTP version may
2685 * have been altered by now.
2687 * connect = Open a socket to the host:port of the server
2688 * and short-circuit server and client socket.
2690 * pass = Pass the request unchanged if forwarding a CONNECT
2691 * request to a parent proxy. Note that we'll be sending
2692 * the CFAIL message ourselves if connecting to the parent
2693 * fails, but we won't send a CSUCCEED message if it works,
2694 * since that would result in a double message (ours and the
2695 * parent's). After sending the request to the parent, we simply
2698 * here's the matrix:
2701 * +--------+--------+
2703 * 0 | create | connect|
2705 * Forwarding +--------+--------+
2707 * 1 | create | pass |
2709 * +--------+--------+
2713 if (http->ssl && connect_port_is_forbidden(csp))
2715 const char *acceptable_connect_ports =
2716 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2717 assert(NULL != acceptable_connect_ports);
2718 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2719 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2720 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2721 csp->action->flags |= ACTION_BLOCK;
2727 freez(csp->headers->first->str);
2728 build_request_line(csp, fwd, &csp->headers->first->str);
2732 * We have a request. Check if one of the crunchers wants it.
2734 if (crunch_response_triggered(csp, crunchers_all))
2737 * Yes. The client got the crunch response
2738 * and we are done here after cleaning up.
2740 /* XXX: why list_remove_all()? */
2741 list_remove_all(csp->headers);
2746 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2748 if (fwd->forward_host)
2750 log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
2751 fwd->forward_host, fwd->forward_port, http->hostport);
2755 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2758 /* here we connect to the server, gateway, or the forwarder */
2760 while ((csp->sfd = forwarded_connect(fwd, http, csp))
2761 && (errno == EINVAL)
2762 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2764 log_error(LOG_LEVEL_ERROR,
2765 "failed request #%u to connect to %s. Trying again.",
2766 forwarded_connect_retries, http->hostport);
2769 if (csp->sfd == JB_INVALID_SOCKET)
2771 if (fwd->type != SOCKS_NONE)
2774 rsp = error_response(csp, "forwarding-failed", errno);
2776 else if (errno == EINVAL)
2778 rsp = error_response(csp, "no-such-domain", errno);
2782 rsp = error_response(csp, "connect-failed", errno);
2783 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2787 /* Write the answer to the client */
2790 send_crunch_response(csp, rsp);
2796 hdr = list_to_text(csp->headers);
2799 /* FIXME Should handle error properly */
2800 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2802 list_remove_all(csp->headers);
2804 if (fwd->forward_host || (http->ssl == 0))
2807 * Write the client's (modified) header to the server
2808 * (along with anything else that may be in the buffer)
2810 if (write_socket(csp->sfd, hdr, strlen(hdr))
2811 || (flush_socket(csp->sfd, csp->iob) < 0))
2813 log_error(LOG_LEVEL_CONNECT,
2814 "write header to: %s failed: %E", http->hostport);
2816 rsp = error_response(csp, "connect-failed", errno);
2819 send_crunch_response(csp, rsp);
2829 * We're running an SSL tunnel and we're not forwarding,
2830 * so just send the "connect succeeded" message to the
2831 * client, flush the rest, and get out of the way.
2833 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2841 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2843 /* we're finished with the client's header */
2846 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
2848 /* pass data between the client and server
2849 * until one or the other shuts down the connection.
2858 * FD_ZERO here seems to point to an errant macro which crashes.
2859 * So do this by hand for now...
2861 memset(&rfds,0x00,sizeof(fd_set));
2865 FD_SET(csp->cfd, &rfds);
2866 FD_SET(csp->sfd, &rfds);
2868 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2869 if ((csp->flags & CSP_FLAG_CHUNKED)
2870 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2871 && ((csp->iob->eod - csp->iob->cur) >= 5)
2872 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2874 log_error(LOG_LEVEL_CONNECT,
2875 "Looks like we read the last chunk together with "
2876 "the server headers. We better stop reading.");
2877 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2878 csp->expected_content_length = byte_count;
2879 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2881 if (server_body && server_response_is_complete(csp, byte_count))
2883 log_error(LOG_LEVEL_CONNECT,
2884 "Done reading from server. Expected content length: %llu. "
2885 "Actual content length: %llu. Most recently received: %d.",
2886 csp->expected_content_length, byte_count, len);
2889 * XXX: should not jump around,
2890 * chat() is complicated enough already.
2894 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2896 timeout.tv_sec = csp->config->socket_timeout;
2897 timeout.tv_usec = 0;
2898 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
2902 log_error(LOG_LEVEL_ERROR,
2903 "Didn't receive data in time: %s", http->url);
2904 if ((byte_count == 0) && (http->ssl == 0))
2906 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2907 strlen(CONNECTION_TIMEOUT_RESPONSE));
2909 mark_server_socket_tainted(csp);
2914 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2915 mark_server_socket_tainted(csp);
2920 * This is the body of the browser's request,
2921 * just read and write it.
2923 if (FD_ISSET(csp->cfd, &rfds))
2925 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2929 /* XXX: not sure if this is necessary. */
2930 mark_server_socket_tainted(csp);
2931 break; /* "game over, man" */
2934 if (write_socket(csp->sfd, buf, (size_t)len))
2936 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2937 mark_server_socket_tainted(csp);
2944 * The server wants to talk. It could be the header or the body.
2945 * If `hdr' is null, then it's the header otherwise it's the body.
2946 * FIXME: Does `hdr' really mean `host'? No.
2948 if (FD_ISSET(csp->sfd, &rfds))
2951 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2955 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2957 if (http->ssl && (fwd->forward_host == NULL))
2960 * Just hang up. We already confirmed the client's CONNECT
2961 * request with status code 200 and unencrypted content is
2962 * no longer welcome.
2964 log_error(LOG_LEVEL_ERROR,
2965 "CONNECT already confirmed. Unable to tell the client about the problem.");
2968 else if (byte_count)
2971 * Just hang up. We already transmitted the original headers
2972 * and parts of the original content and therefore missed the
2973 * chance to send an error message (without risking data corruption).
2975 * XXX: we could retry with a fancy range request here.
2977 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2978 "Unable to tell the client about the problem.");
2979 mark_server_socket_tainted(csp);
2983 * XXX: Consider handling the cases above the same.
2985 mark_server_socket_tainted(csp);
2989 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2990 if (csp->flags & CSP_FLAG_CHUNKED)
2992 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
2994 /* XXX: this is a temporary hack */
2995 log_error(LOG_LEVEL_CONNECT,
2996 "Looks like we reached the end of the last chunk. "
2997 "We better stop reading.");
2998 csp->expected_content_length = byte_count + (unsigned long long)len;
2999 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3003 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
3006 * Add a trailing zero to let be able to use string operations.
3007 * XXX: do we still need this with filter_popups gone?
3012 * Normally, this would indicate that we've read
3013 * as much as the server has sent us and we can
3014 * close the client connection. However, Microsoft
3015 * in its wisdom has released IIS/5 with a bug that
3016 * prevents it from sending the trailing \r\n in
3017 * a 302 redirect header (and possibly other headers).
3018 * To work around this if we've haven't parsed
3019 * a full header we'll append a trailing \r\n
3020 * and see if this now generates a valid one.
3022 * This hack shouldn't have any impacts. If we've
3023 * already transmitted the header or if this is a
3024 * SSL connection, then we won't bother with this
3025 * hack. So we only work on partially received
3026 * headers. If we append a \r\n and this still
3027 * doesn't generate a valid header, then we won't
3028 * transmit anything to the client.
3033 if (server_body || http->ssl)
3036 * If we have been buffering up the document,
3037 * now is the time to apply content modification
3038 * and send the result to the client.
3042 p = execute_content_filter(csp, content_filter);
3044 * If the content filter fails, use the original
3045 * buffer and length.
3046 * (see p != NULL ? p : csp->iob->cur below)
3050 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3053 if (JB_ERR_OK != update_server_headers(csp))
3055 log_error(LOG_LEVEL_FATAL,
3056 "Failed to update server headers. after filtering.");
3059 hdr = list_to_text(csp->headers);
3062 /* FIXME Should handle error properly */
3063 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3066 if (write_socket(csp->cfd, hdr, strlen(hdr))
3067 || write_socket(csp->cfd,
3068 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
3070 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3073 mark_server_socket_tainted(csp);
3081 break; /* "game over, man" */
3085 * This is NOT the body, so
3086 * Let's pretend the server just sent us a blank line.
3088 snprintf(buf, sizeof(buf), "\r\n");
3089 len = (int)strlen(buf);
3092 * Now, let the normal header parsing algorithm below do its
3093 * job. If it fails, we'll exit instead of continuing.
3100 * If this is an SSL connection or we're in the body
3101 * of the server document, just write it to the client,
3102 * unless we need to buffer the body for later content-filtering
3104 if (server_body || http->ssl)
3109 * If there is no memory left for buffering the content, or the buffer limit
3110 * has been reached, switch to non-filtering mode, i.e. make & write the
3111 * header, flush the iob and buf, and get out of the way.
3113 if (add_to_iob(csp, buf, len))
3118 log_error(LOG_LEVEL_INFO,
3119 "Flushing header and buffers. Stepping back from filtering.");
3121 hdr = list_to_text(csp->headers);
3125 * Memory is too tight to even generate the header.
3126 * Send our static "Out-of-memory" page.
3128 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3129 rsp = cgi_error_memory();
3130 send_crunch_response(csp, rsp);
3131 mark_server_socket_tainted(csp);
3134 hdrlen = strlen(hdr);
3136 if (write_socket(csp->cfd, hdr, hdrlen)
3137 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
3138 || (write_socket(csp->cfd, buf, (size_t)len)))
3140 log_error(LOG_LEVEL_CONNECT,
3141 "Flush header and buffers to client failed: %E");
3143 mark_server_socket_tainted(csp);
3148 * Reset the byte_count to the amount of bytes
3149 * we just flushed. len will be added a few lines below,
3150 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3152 byte_count = (unsigned long long)flushed;
3154 content_filter = NULL;
3160 if (write_socket(csp->cfd, buf, (size_t)len))
3162 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3163 mark_server_socket_tainted(csp);
3167 byte_count += (unsigned long long)len;
3172 const char *header_start;
3174 * We're still looking for the end of the server's header.
3175 * Buffer up the data we just read. If that fails, there's
3176 * little we can do but send our static out-of-memory page.
3178 if (add_to_iob(csp, buf, len))
3180 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3181 rsp = cgi_error_memory();
3182 send_crunch_response(csp, rsp);
3183 mark_server_socket_tainted(csp);
3187 header_start = csp->iob->cur;
3189 /* Convert iob into something sed() can digest */
3190 if (JB_ERR_PARSE == get_server_headers(csp))
3195 * Well, we tried our MS IIS/5 hack and it didn't work.
3196 * The header is incomplete and there isn't anything
3197 * we can do about it.
3199 log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3200 "Applying the MS IIS5 hack didn't help.");
3201 log_error(LOG_LEVEL_CLF,
3202 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3203 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3204 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3205 mark_server_socket_tainted(csp);
3211 * Since we have to wait for more from the server before
3212 * we can parse the headers we just continue here.
3214 long header_offset = csp->iob->cur - header_start;
3215 assert(csp->iob->cur >= header_start);
3216 byte_count += (unsigned long long)(len - header_offset);
3217 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
3218 "byte_count: %llu. header_offset: %d. len: %d.",
3219 byte_count, header_offset, len);
3224 /* Did we actually get anything? */
3225 if (NULL == csp->headers->first)
3227 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
3228 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3229 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
3230 free_http_request(http);
3231 mark_server_socket_tainted(csp);
3235 assert(csp->headers->first->str);
3237 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3238 strncmpic(csp->headers->first->str, "ICY", 3))
3241 * It doesn't look like a HTTP (or Shoutcast) response:
3242 * tell the client and log the problem.
3244 if (strlen(csp->headers->first->str) > 30)
3246 csp->headers->first->str[30] = '\0';
3248 log_error(LOG_LEVEL_ERROR,
3249 "Invalid server or forwarder response. Starts with: %s",
3250 csp->headers->first->str);
3251 log_error(LOG_LEVEL_CLF,
3252 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3253 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3254 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3255 free_http_request(http);
3256 mark_server_socket_tainted(csp);
3261 * We have now received the entire server header,
3262 * filter it and send the result to the client
3264 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3266 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
3268 hdr = list_to_text(csp->headers);
3271 /* FIXME Should handle error properly */
3272 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3275 if (crunch_response_triggered(csp, crunchers_light))
3278 * One of the tags created by a server-header
3279 * tagger triggered a crunch. We already
3280 * delivered the crunch response to the client
3281 * and are done here after cleaning up.
3284 mark_server_socket_tainted(csp);
3287 /* Buffer and pcrs filter this if appropriate. */
3289 if (!http->ssl) /* We talk plaintext */
3291 content_filter = get_filter_function(csp);
3294 * Only write if we're not buffering for content modification
3296 if (!content_filter)
3299 * Write the server's (modified) header to
3300 * the client (along with anything else that
3301 * may be in the buffer)
3304 if (write_socket(csp->cfd, hdr, strlen(hdr))
3305 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
3307 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
3310 * The write failed, so don't bother mentioning it
3311 * to the client... it probably can't hear us anyway.
3314 mark_server_socket_tainted(csp);
3318 byte_count += (unsigned long long)len;
3323 * XXX: the header lenght should probably
3324 * be calculated by get_server_headers().
3326 long header_length = csp->iob->cur - header_start;
3327 assert(csp->iob->cur > header_start);
3328 byte_count += (unsigned long long)(len - header_length);
3331 /* we're finished with the server's header */
3337 * If this was a MS IIS/5 hack then it means the server
3338 * has already closed the connection. Nothing more to read.
3343 log_error(LOG_LEVEL_ERROR,
3344 "Closed server connection detected. "
3345 "Applying the MS IIS5 hack didn't help.");
3346 log_error(LOG_LEVEL_CLF,
3347 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3348 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3349 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3350 mark_server_socket_tainted(csp);
3356 mark_server_socket_tainted(csp);
3357 return; /* huh? we should never get here */
3360 if (csp->content_length == 0)
3363 * If Privoxy didn't recalculate the Content-Lenght,
3364 * byte_count is still correct.
3366 csp->content_length = byte_count;
3369 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3370 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3371 && (csp->expected_content_length != byte_count))
3373 log_error(LOG_LEVEL_CONNECT,
3374 "Received %llu bytes while expecting %llu.",
3375 byte_count, csp->expected_content_length);
3376 mark_server_socket_tainted(csp);
3380 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3381 csp->ip_addr_str, http->ocmd, csp->content_length);
3385 /*********************************************************************
3389 * Description : This is little more than chat. We only "serve" to
3390 * to close (or remember) any socket that chat may have
3394 * 1 : csp = Current client state (buffers, headers, etc...)
3398 *********************************************************************/
3400 void serve(struct client_state *csp)
3401 #else /* ifndef AMIGA */
3402 static void serve(struct client_state *csp)
3403 #endif /* def AMIGA */
3407 if (csp->sfd != JB_INVALID_SOCKET)
3409 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3410 static int monitor_thread_running = 0;
3412 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
3413 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
3415 remember_connection(csp->sfd, csp->http, forward_url(csp, csp->http));
3416 close_socket(csp->cfd);
3417 csp->cfd = JB_INVALID_SOCKET;
3418 privoxy_mutex_lock(&connection_reuse_mutex);
3419 if (!monitor_thread_running)
3421 monitor_thread_running = 1;
3422 privoxy_mutex_unlock(&connection_reuse_mutex);
3423 wait_for_alive_connections();
3424 privoxy_mutex_lock(&connection_reuse_mutex);
3425 monitor_thread_running = 0;
3427 privoxy_mutex_unlock(&connection_reuse_mutex);
3431 forget_connection(csp->sfd);
3432 close_socket(csp->sfd);
3435 close_socket(csp->sfd);
3436 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3439 if (csp->cfd != JB_INVALID_SOCKET)
3441 close_socket(csp->cfd);
3444 csp->flags &= ~CSP_FLAG_ACTIVE;
3450 /*********************************************************************
3452 * Function : server_thread
3454 * Description : We only exist to call `serve' in a threaded environment.
3457 * 1 : data = Current client state (buffers, headers, etc...)
3459 * Returns : Always 0.
3461 *********************************************************************/
3462 static int32 server_thread(void *data)
3464 serve((struct client_state *) data);
3471 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3472 /*********************************************************************
3476 * Description : Print usage info & exit.
3478 * Parameters : Pointer to argv[0] for identifying ourselves
3482 *********************************************************************/
3483 static void usage(const char *myname)
3485 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
3489 #endif /* defined(unix) */
3492 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
3493 #endif /* defined(unix) */
3494 "[--version] [configfile]\n"
3495 "Aborting\n", myname);
3500 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
3503 #ifdef MUTEX_LOCKS_AVAILABLE
3504 /*********************************************************************
3506 * Function : privoxy_mutex_lock
3508 * Description : Locks a mutex.
3511 * 1 : mutex = The mutex to lock.
3513 * Returns : Void. May exit in case of errors.
3515 *********************************************************************/
3516 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
3518 #ifdef FEATURE_PTHREAD
3519 int err = pthread_mutex_lock(mutex);
3522 if (mutex != &log_mutex)
3524 log_error(LOG_LEVEL_FATAL,
3525 "Mutex locking failed: %s.\n", strerror(err));
3530 EnterCriticalSection(mutex);
3531 #endif /* def FEATURE_PTHREAD */
3535 /*********************************************************************
3537 * Function : privoxy_mutex_unlock
3539 * Description : Unlocks a mutex.
3542 * 1 : mutex = The mutex to unlock.
3544 * Returns : Void. May exit in case of errors.
3546 *********************************************************************/
3547 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
3549 #ifdef FEATURE_PTHREAD
3550 int err = pthread_mutex_unlock(mutex);
3553 if (mutex != &log_mutex)
3555 log_error(LOG_LEVEL_FATAL,
3556 "Mutex unlocking failed: %s.\n", strerror(err));
3561 LeaveCriticalSection(mutex);
3562 #endif /* def FEATURE_PTHREAD */
3566 /*********************************************************************
3568 * Function : privoxy_mutex_init
3570 * Description : Prepares a mutex.
3573 * 1 : mutex = The mutex to initialize.
3575 * Returns : Void. May exit in case of errors.
3577 *********************************************************************/
3578 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
3580 #ifdef FEATURE_PTHREAD
3581 int err = pthread_mutex_init(mutex, 0);
3584 printf("Fatal error. Mutex initialization failed: %s.\n",
3589 InitializeCriticalSection(mutex);
3590 #endif /* def FEATURE_PTHREAD */
3592 #endif /* def MUTEX_LOCKS_AVAILABLE */
3594 /*********************************************************************
3596 * Function : initialize_mutexes
3598 * Description : Prepares mutexes if mutex support is available.
3602 * Returns : Void, exits in case of errors.
3604 *********************************************************************/
3605 static void initialize_mutexes(void)
3607 #ifdef MUTEX_LOCKS_AVAILABLE
3609 * Prepare global mutex semaphores
3611 privoxy_mutex_init(&log_mutex);
3612 privoxy_mutex_init(&log_init_mutex);
3613 privoxy_mutex_init(&connection_reuse_mutex);
3616 * XXX: The assumptions below are a bit naive
3617 * and can cause locks that aren't necessary.
3619 * For example older FreeBSD versions (< 6.x?)
3620 * have no gethostbyname_r, but gethostbyname is
3623 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
3624 privoxy_mutex_init(&resolver_mutex);
3625 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
3627 * XXX: should we use a single mutex for
3628 * localtime() and gmtime() as well?
3630 #ifndef HAVE_GMTIME_R
3631 privoxy_mutex_init(&gmtime_mutex);
3632 #endif /* ndef HAVE_GMTIME_R */
3634 #ifndef HAVE_LOCALTIME_R
3635 privoxy_mutex_init(&localtime_mutex);
3636 #endif /* ndef HAVE_GMTIME_R */
3639 privoxy_mutex_init(&rand_mutex);
3640 #endif /* ndef HAVE_RANDOM */
3641 #endif /* def MUTEX_LOCKS_AVAILABLE */
3645 /*********************************************************************
3649 * Description : Load the config file and start the listen loop.
3650 * This function is a lot more *sane* with the `load_config'
3651 * and `listen_loop' functions; although it stills does
3652 * a *little* too much for my taste.
3655 * 1 : argc = Number of parameters (including $0).
3656 * 2 : argv = Array of (char *)'s to the parameters.
3658 * Returns : 1 if : can't open config file, unrecognized directive,
3659 * stats requested in multi-thread mode, can't open the
3660 * log file, can't open the jar file, listen port is invalid,
3661 * any load fails, and can't bind port.
3663 * Else main never returns, the process must be signaled
3664 * to terminate execution. Or, on Windows, use the
3665 * "File", "Exit" menu option.
3667 *********************************************************************/
3669 int real_main(int argc, const char *argv[])
3671 int main(int argc, const char *argv[])
3675 unsigned int random_seed;
3677 struct passwd *pw = NULL;
3678 struct group *grp = NULL;
3681 char *pre_chroot_nslookup_to_load_resolver = NULL;
3688 #if !defined(_WIN32)
3695 /* Prepare mutexes if supported and necessary. */
3696 initialize_mutexes();
3698 /* Enable logging until further notice. */
3702 * Parse the command line arguments
3704 * XXX: simply printing usage information in case of
3705 * invalid arguments isn't particularly user friendly.
3707 while (++argc_pos < argc)
3710 /* Check to see if the service must be installed or uninstalled */
3711 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3713 const char *pName = argv[argc_pos] + 9;
3716 exit( (install_service(pName)) ? 0 : 1 );
3718 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3720 const char *pName = argv[argc_pos] + 11;
3723 exit((uninstall_service(pName)) ? 0 : 1);
3725 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3727 bRunAsService = TRUE;
3728 w32_set_service_cwd();
3729 atexit(w32_service_exit_notify);
3732 #endif /* defined(_WIN32) */
3735 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3737 if (strcmp(argv[argc_pos], "--help") == 0)
3742 else if(strcmp(argv[argc_pos], "--version") == 0)
3744 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3750 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3752 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
3756 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3758 if (++argc_pos == argc) usage(argv[0]);
3759 pidfile = strdup(argv[argc_pos]);
3762 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3764 if (++argc_pos == argc) usage(argv[argc_pos]);
3766 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3769 if (NULL == (grp = getgrnam(p)))
3771 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3775 if (NULL == (pw = getpwnam(argv[argc_pos])))
3777 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3780 if (p != NULL) *--p = '\0';
3783 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3785 if (++argc_pos == argc) usage(argv[0]);
3786 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3789 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3793 #endif /* defined(unix) */
3795 else if (argc_pos + 1 != argc)
3798 * This is neither the last command line
3799 * option, nor was it recognized before,
3800 * therefore it must be invalid.
3806 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3808 configfile = argv[argc_pos];
3811 } /* -END- while (more arguments) */
3813 show_version(Argv[0]);
3816 if ( *configfile != '/' )
3818 char cwd[BUFFER_SIZE];
3820 size_t abs_file_size;
3822 /* make config-filename absolute here */
3823 if (NULL == getcwd(cwd, sizeof(cwd)))
3825 perror("failed to get current working directory");
3830 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3831 basedir = strdup(cwd);
3833 if (NULL == basedir ||
3834 NULL == (abs_file = malloc(abs_file_size)))
3836 perror("malloc failed");
3839 strlcpy(abs_file, basedir, abs_file_size);
3840 strlcat(abs_file, "/", abs_file_size );
3841 strlcat(abs_file, configfile, abs_file_size);
3842 configfile = abs_file;
3844 #endif /* defined unix */
3848 clients->next = NULL;
3850 /* XXX: factor out initialising after the next stable release. */
3853 #elif defined(_WIN32)
3857 random_seed = (unsigned int)time(NULL);
3859 srandom(random_seed);
3862 #endif /* ifdef HAVE_RANDOM */
3865 * Unix signal handling
3867 * Catch the abort, interrupt and terminate signals for a graceful exit
3868 * Catch the hangup signal so the errlog can be reopened.
3869 * Ignore the broken pipe signals (FIXME: Why?)
3871 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3874 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3875 const int ignored_signals[] = { SIGPIPE, 0 };
3877 for (idx = 0; catched_signals[idx] != 0; idx++)
3879 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3880 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3882 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3883 #endif /* ifdef sun */
3885 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3889 for (idx = 0; ignored_signals[idx] != 0; idx++)
3891 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3893 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3898 #else /* ifdef _WIN32 */
3899 # ifdef _WIN_CONSOLE
3901 * We *are* in a windows console app.
3902 * Print a verbose messages about FAQ's and such
3904 printf("%s", win32_blurb);
3905 # endif /* def _WIN_CONSOLE */
3906 #endif /* def _WIN32 */
3909 /* Initialize the CGI subsystem */
3910 cgi_init_error_messages();
3913 * If runnig on unix and without the --nodaemon
3914 * option, become a daemon. I.e. fork, detach
3915 * from tty and get process group leadership
3928 if ( pid < 0 ) /* error */
3933 else if ( pid != 0 ) /* parent */
3938 * must check for errors
3939 * child died due to missing files aso
3942 wpid = waitpid( pid, &status, WNOHANG );
3951 /* Should be more portable, but not as well tested */
3956 #else /* ndef __FreeBSD__ */
3958 #endif /* ndef __FreeBSD__ */
3959 fd = open("/dev/tty", O_RDONLY);
3962 /* no error check here */
3963 ioctl( fd, TIOCNOTTY,0 );
3968 * stderr (fd 2) will be closed later on,
3969 * when the config file has been parsed.
3976 } /* -END- if (!no_daemon) */
3979 * As soon as we have written the PID file, we can switch
3980 * to the user and group ID indicated by the --user option
3986 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3988 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3992 if (setgroups(1, &grp->gr_gid))
3994 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
3997 else if (initgroups(pw->pw_name, pw->pw_gid))
3999 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
4005 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
4007 /* Read the time zone file from /etc before doing chroot. */
4009 if (NULL != pre_chroot_nslookup_to_load_resolver
4010 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
4012 /* Initialize resolver library. */
4013 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
4015 if (chroot(pw->pw_dir) < 0)
4017 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
4021 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
4024 if (setuid(pw->pw_uid))
4026 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
4030 char putenv_dummy[64];
4032 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
4033 if (putenv(putenv_dummy) != 0)
4035 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
4038 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
4039 if (putenv(putenv_dummy) != 0)
4041 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
4047 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
4050 #endif /* defined unix */
4053 /* This will be FALSE unless the command line specified --service
4057 /* Yup, so now we must attempt to establish a connection
4058 * with the service dispatcher. This will only work if this
4059 * process was launched by the service control manager to
4060 * actually run as a service. If this isn't the case, i've
4061 * known it take around 30 seconds or so for the call to return.
4064 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
4065 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
4067 /* Service has run, and at this point is now being stopped, so just return */
4072 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
4074 /* An error occurred. Usually it's because --service was wrongly specified
4075 * and we were unable to connect to the Service Control Dispatcher because
4076 * it wasn't expecting us and is therefore not listening.
4078 * For now, just continue below to call the listen_loop function.
4081 #endif /* def _WIN32 */
4091 /*********************************************************************
4093 * Function : bind_port_helper
4095 * Description : Bind the listen port. Handles logging, and aborts
4099 * 1 : config = Privoxy configuration. Specifies port
4102 * Returns : Port that was opened.
4104 *********************************************************************/
4105 static jb_socket bind_port_helper(struct configuration_spec * config)
4110 if (config->haddr == NULL)
4112 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
4117 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
4118 config->hport, config->haddr);
4121 result = bind_port(config->haddr, config->hport, &bfd);
4128 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4129 "There may be another Privoxy or some other "
4130 "proxy running on port %d",
4131 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
4132 config->hport, config->hport);
4135 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4136 "The hostname is not resolvable",
4137 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4140 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
4141 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4144 /* shouldn't get here */
4145 return JB_INVALID_SOCKET;
4148 config->need_bind = 0;
4155 /* Without this simple workaround we get this compiler warning from _beginthread
4156 * warning C4028: formal parameter 1 different from declaration
4158 void w32_service_listen_loop(void *p)
4162 #endif /* def _WIN32 */
4165 /*********************************************************************
4167 * Function : listen_loop
4169 * Description : bind the listen port and enter a "FOREVER" listening loop.
4175 *********************************************************************/
4176 static void listen_loop(void)
4178 struct client_state *csp = NULL;
4180 struct configuration_spec * config;
4182 config = load_config();
4184 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4186 * XXX: Should be relocated once it no
4187 * longer needs to emit log messages.
4189 initialize_reusable_connections();
4190 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4192 bfd = bind_port_helper(config);
4194 #ifdef FEATURE_GRACEFUL_TERMINATION
4195 while (!g_terminate)
4200 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
4201 while (waitpid(-1, NULL, WNOHANG) > 0)
4203 /* zombie children */
4205 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
4208 * Free data that was used by died threads
4214 * Re-open the errlog after HUP signal
4216 if (received_hup_signal)
4218 if (NULL != config->logfile)
4220 init_error_log(Argv[0], config->logfile);
4222 received_hup_signal = 0;
4226 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
4228 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
4232 csp->flags |= CSP_FLAG_ACTIVE;
4233 csp->sfd = JB_INVALID_SOCKET;
4235 csp->config = config = load_config();
4237 if ( config->need_bind )
4240 * Since we were listening to the "old port", we will not see
4241 * a "listen" param change until the next request. So, at
4242 * least 1 more request must be made for us to find the new
4243 * setting. I am simply closing the old socket and binding the
4246 * Which-ever is correct, we will serve 1 more page via the
4247 * old settings. This should probably be a "show-proxy-args"
4248 * request. This should not be a so common of an operation
4249 * that this will hurt people's feelings.
4254 bfd = bind_port_helper(config);
4257 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
4259 if (!accept_connection(csp, bfd))
4261 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
4274 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
4277 #ifdef FEATURE_TOGGLE
4278 if (global_toggle_state)
4279 #endif /* def FEATURE_TOGGLE */
4281 csp->flags |= CSP_FLAG_TOGGLED_ON;
4284 if (run_loader(csp))
4286 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
4287 /* Never get here - LOG_LEVEL_FATAL causes program exit */
4291 if (block_acl(NULL,csp))
4293 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
4294 close_socket(csp->cfd);
4295 freez(csp->ip_addr_str);
4299 #endif /* def FEATURE_ACL */
4301 /* add it to the list of clients */
4302 csp->next = clients->next;
4303 clients->next = csp;
4305 if (config->multi_threaded)
4309 /* this is a switch () statment in the C preprocessor - ugh */
4310 #undef SELECTED_ONE_OPTION
4312 /* Use Pthreads in preference to native code */
4313 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
4314 #define SELECTED_ONE_OPTION
4316 pthread_t the_thread;
4317 pthread_attr_t attrs;
4319 pthread_attr_init(&attrs);
4320 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
4321 errno = pthread_create(&the_thread, &attrs,
4322 (void * (*)(void *))serve, csp);
4323 child_id = errno ? -1 : 0;
4324 pthread_attr_destroy(&attrs);
4328 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
4329 #define SELECTED_ONE_OPTION
4330 child_id = _beginthread(
4331 (void (*)(void *))serve,
4336 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
4337 #define SELECTED_ONE_OPTION
4338 child_id = _beginthread(
4339 (void(* _Optlink)(void*))serve,
4345 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
4346 #define SELECTED_ONE_OPTION
4348 thread_id tid = spawn_thread
4349 (server_thread, "server", B_NORMAL_PRIORITY, csp);
4351 if ((tid >= 0) && (resume_thread(tid) == B_OK))
4353 child_id = (int) tid;
4362 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
4363 #define SELECTED_ONE_OPTION
4364 csp->cfd = ReleaseSocket(csp->cfd, -1);
4367 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4368 NP_Output, Output(),
4369 NP_CloseOutput, FALSE,
4370 NP_Name, (ULONG)"privoxy child",
4374 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4375 NP_Output, Output(),
4376 NP_CloseOutput, FALSE,
4377 NP_Name, (ULONG)"privoxy child",
4378 NP_StackSize, 200*1024,
4384 ((struct Task *)child_id)->tc_UserData = csp;
4385 Signal((struct Task *)child_id, SIGF_SINGLE);
4390 #if !defined(SELECTED_ONE_OPTION)
4393 /* This block is only needed when using fork().
4394 * When using threads, the server thread was
4395 * created and run by the call to _beginthread().
4397 if (child_id == 0) /* child */
4400 #ifdef FEATURE_TOGGLE
4401 int inherited_toggle_state = global_toggle_state;
4402 #endif /* def FEATURE_TOGGLE */
4407 * If we've been toggled or we've blocked the request, tell Mom
4410 #ifdef FEATURE_TOGGLE
4411 if (inherited_toggle_state != global_toggle_state)
4413 rc |= RC_FLAG_TOGGLED;
4415 #endif /* def FEATURE_TOGGLE */
4417 #ifdef FEATURE_STATISTICS
4418 if (csp->flags & CSP_FLAG_REJECTED)
4420 rc |= RC_FLAG_BLOCKED;
4422 #endif /* ndef FEATURE_STATISTICS */
4426 else if (child_id > 0) /* parent */
4428 /* in a fork()'d environment, the parent's
4429 * copy of the client socket and the CSP
4433 #if !defined(_WIN32) && !defined(__CYGWIN__)
4435 wait( &child_status );
4438 * Evaluate child's return code: If the child has
4439 * - been toggled, toggle ourselves
4440 * - blocked its request, bump up the stats counter
4443 #ifdef FEATURE_TOGGLE
4444 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
4446 global_toggle_state = !global_toggle_state;
4448 #endif /* def FEATURE_TOGGLE */
4450 #ifdef FEATURE_STATISTICS
4452 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
4456 #endif /* def FEATURE_STATISTICS */
4458 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
4459 close_socket(csp->cfd);
4460 csp->flags &= ~CSP_FLAG_ACTIVE;
4464 #undef SELECTED_ONE_OPTION
4465 /* end of cpp switch () */
4470 * Spawning the child failed, assume it's because
4471 * there are too many children running already.
4472 * XXX: If you assume ...
4474 log_error(LOG_LEVEL_ERROR,
4475 "Unable to take any additional connections: %E");
4476 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
4477 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
4478 close_socket(csp->cfd);
4479 csp->flags &= ~CSP_FLAG_ACTIVE;
4488 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
4490 /* Clean up. Aim: free all memory (no leaks) */
4491 #ifdef FEATURE_GRACEFUL_TERMINATION
4493 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
4495 unload_current_config_file();
4496 unload_current_actions_file();
4497 unload_current_re_filterfile();
4498 #ifdef FEATURE_TRUST
4499 unload_current_trust_file();
4502 if (config->multi_threaded)
4509 } while ((clients->next != NULL) && (--i > 0));
4513 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
4524 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
4525 /* Cleanup - remove taskbar icon etc. */
4530 #endif /* FEATURE_GRACEFUL_TERMINATION */
4540 vim:softtabstop=3 shiftwidth=3