1 const char jcc_rcs[] = "$Id: jcc.c,v 1.239 2009/04/07 11:43:50 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 1.239 2009/04/07 11:43:50 fabiankeil
37 * If the server rudely resets the connection directly after sending the
38 * headers, pass the mess to the client instead of sending an incorrect
39 * connect-failed message. Fixes #2698674 reported by mybugaccount.
41 * Revision 1.238 2009/03/27 14:42:30 fabiankeil
42 * Correct the status code for CONNECTION_TIMEOUT_RESPONSE.
44 * Revision 1.237 2009/03/27 14:32:04 fabiankeil
45 * If spawning a child in listen_loop() fails, send a real
46 * HTTP response to the client and continue listening for
47 * new connections without artificial delay.
49 * Revision 1.236 2009/03/25 17:30:24 fabiankeil
50 * In serve(), keep the client socket open until we marked the
51 * server socket as unused. This should increase the chances
52 * that we reuse the connection for the client's next request
53 * to the same destination.
55 * Revision 1.235 2009/03/18 21:01:20 fabiankeil
56 * Comment fix. Spotted by Roland.
58 * Revision 1.234 2009/03/18 20:48:42 fabiankeil
59 * If the --no-daemon option is used, enable LOG_LEVEL_INFO
60 * before the config file has been parsed (as we always did).
62 * Revision 1.233 2009/03/13 14:10:07 fabiankeil
63 * Fix some more harmless warnings on amd64.
65 * Revision 1.232 2009/03/08 19:29:16 fabiankeil
66 * Reinitialize the timeout structure every time before passing
67 * it to select(). Apparently some implementations mess with it.
68 * Probably fixes #2669131 reported by cyberpatrol.
70 * Revision 1.231 2009/03/08 14:19:23 fabiankeil
71 * Fix justified (but harmless) compiler warnings
72 * on platforms where sizeof(int) < sizeof(long).
74 * Revision 1.230 2009/03/07 13:09:17 fabiankeil
75 * Change csp->expected_content and_csp->expected_content_length from
76 * size_t to unsigned long long to reduce the likelihood of integer
77 * overflows that would let us close the connection prematurely.
78 * Bug found while investigating #2669131, reported by cyberpatrol.
80 * Revision 1.229 2009/03/07 11:17:01 fabiankeil
81 * Fix compiler warning.
83 * Revision 1.228 2009/03/06 20:30:13 fabiankeil
84 * Log unsigned values as such.
86 * Revision 1.227 2009/03/02 19:18:11 fabiankeil
87 * Streamline parse_http_request()'s prototype. As
88 * cparser pointed out it doesn't actually use csp.
90 * Revision 1.226 2009/03/01 18:28:24 fabiankeil
91 * Help clang understand that we aren't dereferencing
94 * Revision 1.225 2009/02/19 18:09:32 fabiankeil
95 * Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
98 * Revision 1.224 2009/02/14 15:32:04 fabiankeil
99 * Add the request URL to the timeout message in chat().
102 * Revision 1.223 2009/02/09 21:21:16 fabiankeil
103 * Now that init_log_module() is called earlier, call show_version()
104 * later on from main() directly so it doesn't get called for --help
107 * Revision 1.222 2009/02/08 12:56:51 fabiankeil
108 * Call initialize_mutexes() before init_log_module() again.
109 * Broken since r220, might be the cause of Lee's #2579448.
111 * Revision 1.221 2009/02/06 18:02:58 fabiankeil
112 * When dropping privileges, also give up membership in supplementary
113 * groups. Thanks to Matthias Drochner for reporting the problem,
114 * providing the initial patch and testing the final version.
116 * Revision 1.220 2009/02/04 18:29:07 fabiankeil
117 * Initialize the log module before parsing arguments.
118 * Thanks to Matthias Drochner for the report.
120 * Revision 1.219 2009/01/31 16:08:21 fabiankeil
121 * Remove redundant error check in receive_client_request().
123 * Revision 1.218 2009/01/31 12:25:54 fabiankeil
124 * Flatten indentation in receive_client_request().
126 * Revision 1.217 2009/01/07 19:50:09 fabiankeil
127 * - If the socket-timeout has been reached and the client
128 * hasn't received any data yet, send an explanation before
129 * closing the connection.
130 * - In get_request_line(), signal timeouts the right way.
132 * Revision 1.216 2008/12/24 22:13:11 ler762
133 * fix GCC 3.4.4 warning
135 * Revision 1.215 2008/12/24 17:06:19 fabiankeil
136 * Keep a thread around to timeout alive connections
137 * even if no new requests are coming in.
139 * Revision 1.214 2008/12/20 14:53:55 fabiankeil
140 * Add config option socket-timeout to control the time
141 * Privoxy waits for data to arrive on a socket. Useful
142 * in case of stale ssh tunnels or when fuzz-testing.
144 * Revision 1.213 2008/12/15 18:45:51 fabiankeil
145 * When logging crunches, log the whole URL, so one can easily
146 * differentiate between vanilla HTTP and CONNECT requests.
148 * Revision 1.212 2008/12/14 15:46:22 fabiankeil
149 * Give crunched requests their own log level.
151 * Revision 1.211 2008/12/06 10:05:03 fabiankeil
152 * Downgrade "Received x bytes while expecting y." message to
153 * LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
155 * Revision 1.210 2008/12/02 22:03:18 fabiankeil
156 * Don't miscalculate byte_count if we don't get all the
157 * server headers with one read_socket() call. With keep-alive
158 * support enabled, this caused delays until the server closed
161 * Revision 1.209 2008/11/27 09:44:04 fabiankeil
162 * Cosmetics for the last commit: Don't watch out for
163 * the last chunk if the content isn't chunk-encoded or
164 * if we already determined the content length previously.
166 * Revision 1.208 2008/11/26 18:24:17 fabiankeil
167 * Recognize that the server response is complete if the
168 * last chunk is read together with the server headers.
171 * Revision 1.207 2008/11/25 17:25:16 fabiankeil
172 * Don't convert the client-header list to text until we need to.
174 * Revision 1.206 2008/11/23 17:00:11 fabiankeil
175 * Some more chat() cosmetics.
177 * Revision 1.205 2008/11/16 12:43:49 fabiankeil
178 * Turn keep-alive support into a runtime feature
179 * that is disabled by setting keep-alive-timeout
180 * to a negative value.
182 * Revision 1.204 2008/11/06 19:42:17 fabiankeil
183 * Fix last-chunk detection hack to also apply
184 * if buf[] contains nothing but the last-chunk.
186 * Revision 1.203 2008/11/06 18:34:35 fabiankeil
187 * Factor receive_client_request() and
188 * parse_client_request() out of chat().
190 * Revision 1.202 2008/11/02 18:40:34 fabiankeil
191 * If we received a different amount of data than we expected,
192 * log a warning and make sure the server socket isn't reused.
194 * Revision 1.201 2008/11/02 16:48:20 fabiankeil
195 * Revert revision 1.195 and try again.
197 * Revision 1.200 2008/10/26 16:53:18 fabiankeil
200 * Revision 1.199 2008/10/26 15:36:10 fabiankeil
201 * Remove two debug messages with LOG_LEVEL_INFO.
203 * Revision 1.198 2008/10/22 15:19:55 fabiankeil
204 * Once More, With Feeling: if there is no logfile
205 * because the user didn't specify one, we shouldn't
206 * call init_error_log() after receiving SIGHUP either.
208 * Revision 1.197 2008/10/20 17:02:40 fabiankeil
209 * If SIGHUP is received while we aren't running in daemon
210 * mode, calling init_error_log() would be a mistake.
212 * Revision 1.196 2008/10/16 09:16:41 fabiankeil
213 * - Fix two gcc44 conversion warnings.
214 * - Don't bother logging the last five bytes
217 * Revision 1.195 2008/10/13 16:04:37 fabiankeil
218 * Make sure we don't try to reuse tainted server sockets.
220 * Revision 1.194 2008/10/12 18:35:18 fabiankeil
221 * The last commit was a bit too ambitious, apparently the content
222 * length adjustment is only necessary if we aren't buffering.
224 * Revision 1.193 2008/10/12 15:57:35 fabiankeil
225 * Fix content length calculation if we read headers
226 * and the start of the body at once. Now that we have
227 * FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
229 * Revision 1.192 2008/10/11 18:19:14 fabiankeil
230 * Even more chat() cosmetics.
232 * Revision 1.191 2008/10/11 18:00:14 fabiankeil
233 * Reformat some comments in chat().
235 * Revision 1.190 2008/10/11 14:58:00 fabiankeil
236 * In case of chunk-encoded content, stop reading if
237 * the buffer looks like it ends with the last chunk.
239 * Revision 1.189 2008/10/11 09:53:00 fabiankeil
240 * Let server_response_is_complete() deal properly with
241 * content that is neither buffered nor read all at once.
243 * Revision 1.188 2008/10/09 18:21:41 fabiankeil
244 * Flush work-in-progress changes to keep outgoing connections
245 * alive where possible. Incomplete and mostly #ifdef'd out.
247 * Revision 1.187 2008/09/07 12:35:05 fabiankeil
248 * Add mutex lock support for _WIN32.
250 * Revision 1.186 2008/09/04 08:13:58 fabiankeil
251 * Prepare for critical sections on Windows by adding a
252 * layer of indirection before the pthread mutex functions.
254 * Revision 1.185 2008/08/30 12:03:07 fabiankeil
255 * Remove FEATURE_COOKIE_JAR.
257 * Revision 1.184 2008/08/22 15:34:45 fabiankeil
258 * - Silence LLVM/Clang complaint.
259 * - Make received_hup_signal static.
260 * - Hide definitions for basedir, pidfile and received_hup_signal
261 * from __EMX__ as they only seem to be used in case of #ifdef unix.
263 * Revision 1.183 2008/08/21 07:09:35 fabiankeil
264 * Accept Shoutcast responses again. Problem reported
265 * and fix suggested by Stefan in #2062860.
267 * Revision 1.182 2008/06/27 11:13:56 fabiankeil
268 * Fix possible NULL-pointer dereference reported
269 * by din_a4 in #2003937. Pointy hat to me.
271 * Revision 1.181 2008/05/21 15:47:15 fabiankeil
272 * Streamline sed()'s prototype and declare
273 * the header parse and add structures static.
275 * Revision 1.180 2008/05/21 15:26:32 fabiankeil
276 * - Mark csp as immutable for send_crunch_response().
277 * - Fix comment spelling.
279 * Revision 1.179 2008/05/20 20:13:32 fabiankeil
280 * Factor update_server_headers() out of sed(), ditch the
281 * first_run hack and make server_patterns_light static.
283 * Revision 1.178 2008/05/10 13:23:38 fabiankeil
284 * Don't provide get_header() with the whole client state
285 * structure when it only needs access to csp->iob.
287 * Revision 1.177 2008/05/10 11:51:12 fabiankeil
288 * Make the "read the rest of the headers" loop a bit more readable.
290 * Revision 1.176 2008/05/10 11:37:57 fabiankeil
291 * - Instead of logging when the IIS5 hack is enabled, log when it fails.
292 * - Remove useless comment.
294 * Revision 1.175 2008/05/09 18:53:59 fabiankeil
295 * Fix comment grammar.
297 * Revision 1.174 2008/05/07 18:05:53 fabiankeil
298 * Remove the pointless buffer in client_protocol_is_unsupported().
300 * Revision 1.173 2008/05/06 15:09:00 fabiankeil
301 * Least-effort fix for bug #1821930 (reported by Lee):
302 * If the response doesn't look like HTTP,
303 * tell the client and log the problem.
305 * Revision 1.172 2008/04/16 16:38:21 fabiankeil
306 * Don't pass the whole csp structure to flush_socket()
307 * when it only needs a file descriptor and a buffer.
309 * Revision 1.171 2008/03/27 18:27:25 fabiankeil
310 * Remove kill-popups action.
312 * Revision 1.170 2008/03/06 16:33:46 fabiankeil
313 * If limit-connect isn't used, don't limit CONNECT requests to port 443.
315 * Revision 1.169 2008/03/04 18:30:39 fabiankeil
316 * Remove the treat-forbidden-connects-like-blocks action. We now
317 * use the "blocked" page for forbidden CONNECT requests by default.
319 * Revision 1.168 2008/03/02 12:25:25 fabiankeil
320 * Also use shiny new connect_port_is_forbidden() in jcc.c.
322 * Revision 1.167 2008/02/23 16:57:12 fabiankeil
323 * Rename url_actions() to get_url_actions() and let it
324 * use the standard parameter ordering.
326 * Revision 1.166 2008/02/23 16:33:43 fabiankeil
327 * Let forward_url() use the standard parameter ordering
328 * and mark its second parameter immutable.
330 * Revision 1.165 2008/02/02 19:36:56 fabiankeil
331 * Remove the "Listening ... for local connections only" log message.
332 * Whether or not remote connections are able to reach Privoxy is up
333 * to the operating system.
335 * Revision 1.164 2007/12/16 18:32:46 fabiankeil
336 * Prevent the log messages for CONNECT requests to unacceptable
337 * ports from printing the limit-connect argument as [null] if
338 * limit-connect hasn't been explicitly enabled.
340 * Revision 1.163 2007/12/13 01:47:11 david__schmidt
341 * Make sure all console-mode apps get a usage() instance
343 * Revision 1.162 2007/12/06 17:54:57 fabiankeil
344 * Reword NO_SERVER_DATA_RESPONSE to make it harder
345 * to misunderstand what the message is all about.
347 * Revision 1.161 2007/12/04 19:44:22 fabiankeil
348 * Unbreak trustfile which previously didn't work without
349 * FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
351 * Revision 1.160 2007/11/29 18:00:29 fabiankeil
352 * Plug memory leak. Spotted by Valgrind, triggered by
353 * Privoxy-Regression-Test feeding proxyfuzz.py.
355 * Revision 1.159 2007/11/24 14:34:09 fabiankeil
356 * In the HTTP snipplets, refer to the client as client.
358 * Revision 1.158 2007/11/11 16:44:17 fabiankeil
359 * Emit a log message when activating the MS IIS5 hack.
361 * Revision 1.157 2007/11/03 17:34:49 fabiankeil
362 * Log the "weak randomization factor" warning only
363 * once for mingw32 and provide some more details.
365 * Revision 1.156 2007/11/01 18:20:58 fabiankeil
366 * Initialize log module after initializing mutexes, future
367 * deadlocks in that code should now work cross-platform.
369 * Revision 1.155 2007/10/23 20:12:45 fabiankeil
370 * Fix first CSUCCEED line to end in \r\n as required by RFC1945.
371 * Reported by Bert van Leeuwen in BR#1818808.
373 * Revision 1.154 2007/10/19 17:00:08 fabiankeil
374 * Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
376 * Revision 1.153 2007/10/14 14:12:41 fabiankeil
377 * When in daemon mode, close stderr after the configuration file has been
378 * parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
380 * Revision 1.152 2007/10/04 18:03:34 fabiankeil
381 * - Fix a crash when parsing invalid requests whose first header
382 * is rejected by get_header(). Regression (re?)introduced
383 * in r1.143 by yours truly.
384 * - Move ACTION_VANILLA_WAFER handling into parsers.c's
385 * client_cookie_adder() to make sure send-vanilla-wafer can be
386 * controlled through tags (and thus regression-tested).
388 * Revision 1.151 2007/09/29 10:21:16 fabiankeil
389 * - Move get_filter_function() from jcc.c to filters.c
390 * so the filter functions can be static.
391 * - Don't bother filtering body-less responses.
393 * Revision 1.150 2007/09/28 16:39:29 fabiankeil
394 * Execute content filters through execute_content_filter().
396 * Revision 1.149 2007/09/04 15:08:48 fabiankeil
397 * Initialize req to NULL to make sure it's defined if the
398 * first read_socket() call fails. Reported by icmp30.
400 * Revision 1.148 2007/08/26 16:47:13 fabiankeil
401 * Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
402 * extensive comments moved to user manual.
404 * Revision 1.147 2007/08/25 14:42:40 fabiankeil
405 * Don't crash if a broken header filter wiped out the request line.
407 * Revision 1.146 2007/08/20 17:09:32 fabiankeil
408 * Fix byte_count calculation in case of flushes
409 * and don't parse the server headers a second time.
411 * Revision 1.145 2007/08/19 13:13:31 fabiankeil
412 * - If there's a connection problem after we already forwarded
413 * parts of the original content, just hang up. Fixes BR#1776724.
414 * - Fix warnings about unused code on mingw32.
415 * - In case of flushes, calculate the byte count
416 * less incorrectly (I think).
418 * Revision 1.144 2007/08/11 14:43:22 fabiankeil
419 * Add some more prototypes for static functions.
421 * Revision 1.143 2007/08/05 13:58:19 fabiankeil
422 * Comment out request_contains_null_bytes() until it's used again.
424 * Revision 1.142 2007/08/05 13:50:26 fabiankeil
425 * #1763173 from Stefan Huehner: s@const static@static const@
426 * and declare some more functions static.
428 * Revision 1.141 2007/08/04 09:56:23 fabiankeil
429 * - Log rejected CONNECT requests with LOG_LEVEL_INFO
430 * and explain why they were rejected in the first place.
431 * - Fix the LOG_LEVEL_CLF message for crunches of unallowed
432 * CONNECT requests. The request line was missing.
433 * - Add two more XXX reminders as we don't have enough already.
435 * Revision 1.140 2007/07/21 11:51:36 fabiankeil
436 * As Hal noticed, checking dispatch_cgi() as the last cruncher
437 * looks like a bug if CGI requests are blocked unintentionally,
438 * so don't do it unless the user enabled the new config option
439 * "allow-cgi-request-crunching".
441 * Revision 1.139 2007/07/14 07:46:41 fabiankeil
442 * - Allow to rewrite the request destination behind the client's back.
443 * - Turn the weird-looking unconditional for loop that
444 * reads the client request into a conditional while loop.
445 * Move the stuff that only runs once out of the loop.
446 * - Move parts of chat(), server_content_type() and the
447 * necessary stuff to fix BR#1750917 into get_filter_function().
449 * Revision 1.138 2007/06/03 18:45:18 fabiankeil
450 * Temporary workaround for BR#1730105.
452 * Revision 1.137 2007/06/01 18:16:36 fabiankeil
453 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
454 * deadlocks and crashes on OpenBSD and possibly other OS with neither
455 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
456 * Thanks to Ralf Horstmann for report and solution.
458 * Revision 1.136 2007/06/01 16:41:11 fabiankeil
459 * Add forward-override{} to change the forwarding settings through
460 * action sections. This is mainly interesting to forward different
461 * clients differently (for example based on User-Agent or request
464 * Revision 1.135 2007/05/24 17:03:50 fabiankeil
465 * - Let usage() mention the --chroot parameter.
466 * - Use read_socket() consistently and always leave
467 * the last buffer byte alone, even in cases where
468 * null termination (currently) doesn't matter.
470 * Revision 1.134 2007/05/16 14:59:46 fabiankeil
471 * - Fix config file loading on Unix if no config file is specified.
472 * Since r1.97 Privoxy would always interpret the last argument as
473 * config file, even if it's a valid command line option.
474 * - Abort in case of unrecognized command line options. Closes #1719696.
475 * - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
476 * - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
478 * Revision 1.133 2007/05/04 11:23:19 fabiankeil
479 * - Don't rerun crunchers that only depend on the request URL.
480 * - Don't count redirects and CGI requests as "blocked requests".
482 * Revision 1.132 2007/04/25 15:15:17 fabiankeil
483 * Support crunching based on tags created by server-header taggers.
485 * Revision 1.131 2007/04/22 13:24:50 fabiankeil
486 * Make HTTP snippets static (again). Add a Content-Type for those
487 * with content so the browser doesn't guess it based on the URL.
489 * Revision 1.130 2007/04/19 13:47:34 fabiankeil
490 * Move crunching and request line rebuilding out of chat().
492 * Revision 1.129 2007/04/15 16:39:20 fabiankeil
493 * Introduce tags as alternative way to specify which
494 * actions apply to a request. At the moment tags can be
495 * created based on client and server headers.
497 * Revision 1.128 2007/03/25 16:55:54 fabiankeil
498 * Don't CLF-log CONNECT requests twice.
500 * Revision 1.127 2007/03/20 13:53:17 fabiankeil
501 * Log the source address for ACL-related connection drops.
503 * Revision 1.126 2007/03/17 15:20:05 fabiankeil
504 * New config option: enforce-blocks.
506 * Revision 1.125 2007/03/09 14:12:00 fabiankeil
507 * - Move null byte check into separate function.
508 * - Don't confuse the client with error pages
509 * if a CONNECT request was already confirmed.
511 * Revision 1.124 2007/02/23 14:59:54 fabiankeil
512 * Speed up NULL byte escaping and only log the complete
513 * NULL byte requests with header debugging enabled.
515 * Revision 1.123 2007/02/21 18:42:10 fabiankeil
516 * Answer requests that contain NULL bytes with
517 * a custom response instead of waiting for more
518 * data until the client eventually hangs up.
520 * Revision 1.122 2007/02/07 11:12:02 fabiankeil
521 * - Move delivery and logging of crunched responses
522 * from chat() into send_crunch_response().
523 * - Display the reason for generating http_responses.
524 * - Log the content length for LOG_LEVEL_CLF correctly
525 * (still incorrect for some fixed responses).
526 * - Reword an incorrect comment about
527 * treat-forbidden-connects-like-blocks violating
529 * - Add some log messages.
531 * Revision 1.121 2007/01/27 10:52:56 fabiankeil
532 * Move mutex initialization into separate
533 * function and exit in case of errors.
535 * Revision 1.120 2007/01/26 14:18:42 fabiankeil
536 * - Start to reduce chat()'s line count and move
537 * parts of it into separate functions.
538 * - Add "HTTP/1.1 100 Continue" hack for BR 756734.
540 * Revision 1.119 2007/01/25 14:02:30 fabiankeil
541 * - Add Proxy-Agent header to HTTP snippets that are
542 * supposed to reach HTTP clients only.
543 * - Made a few CONNECT log messages more descriptive.
544 * - Catch completely empty server responses (as seen
545 * with Tor's fake ".noconnect" top level domain).
546 * - Use shiny new "forwarding-failed" template for socks errors.
548 * Revision 1.118 2007/01/07 07:43:43 joergs
549 * AmigaOS4 support added.
551 * Revision 1.117 2006/12/31 17:56:37 fabiankeil
552 * Added config option accept-intercepted-requests
553 * and disabled it by default.
555 * Revision 1.116 2006/12/29 19:08:22 fabiankeil
556 * Reverted parts of my last commit
557 * to keep error handling working.
559 * Revision 1.115 2006/12/29 17:38:57 fabiankeil
560 * Fixed gcc43 conversion warnings.
562 * Revision 1.114 2006/12/27 18:52:02 fabiankeil
563 * Fix -pedantic ISO C warning about converting
564 * from function pointer to object pointer.
566 * Revision 1.113 2006/12/26 17:38:50 fabiankeil
567 * Silence compiler warning I introduced with my last commit.
569 * Revision 1.112 2006/12/26 17:31:41 fabiankeil
570 * Mutex protect rand() if POSIX threading
571 * is used, warn the user if that's not possible
572 * and stop using it on _WIN32 where it could
575 * Revision 1.111 2006/12/23 16:15:06 fabiankeil
576 * Don't prevent core dumps by catching SIGABRT.
577 * It's rude and makes debugging unreasonable painful.
579 * Revision 1.110 2006/12/13 14:52:53 etresoft
580 * Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
582 * Revision 1.109 2006/12/06 19:41:40 fabiankeil
583 * Privoxy is now able to run as intercepting
584 * proxy in combination with any packet filter
585 * that does the port redirection. The destination
586 * is extracted from the "Host:" header which
587 * should be available for nearly all requests.
589 * Moved HTTP snipplets into jcc.c.
590 * Added error message for gopher proxy requests.
592 * Revision 1.108 2006/11/28 15:38:51 fabiankeil
593 * Only unlink the pidfile if it's actually used.
595 * Change order of interception checks to make
596 * it possible to block or redirect requests for
599 * Revision 1.107 2006/11/13 19:05:51 fabiankeil
600 * Make pthread mutex locking more generic. Instead of
601 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
602 * and use mutex locking unless there is an _r function
603 * available. Better safe than sorry.
605 * Fixes "./configure --disable-pthread" and should result
606 * in less threading-related problems on pthread-using platforms,
607 * but it still doesn't fix BR#1122404.
609 * Revision 1.106 2006/11/06 19:58:23 fabiankeil
610 * Move pthread.h inclusion from jcc.c to jcc.h.
611 * Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
613 * Revision 1.105 2006/11/06 14:26:02 fabiankeil
614 * Don't exit after receiving the second SIGHUP on Solaris.
616 * Fixes BR 1052235, but the same problem may exist on other
617 * systems. Once 3.0.6 is out we should use sigset()
618 * where available and see if it breaks anything.
620 * Revision 1.104 2006/09/23 13:26:38 roro
621 * Replace TABs by spaces in source code.
623 * Revision 1.103 2006/09/21 12:54:43 fabiankeil
624 * Fix +redirect{}. Didn't work with -fast-redirects.
626 * Revision 1.102 2006/09/06 13:03:04 fabiankeil
627 * Respond with 400 and a short text message
628 * if the client tries to use Privoxy as FTP proxy.
630 * Revision 1.101 2006/09/06 09:23:37 fabiankeil
631 * Make number of retries in case of forwarded-connect problems
632 * a config file option (forwarded-connect-retries) and use 0 as
635 * Revision 1.100 2006/09/03 19:42:59 fabiankeil
636 * Set random(3) seed.
638 * Revision 1.99 2006/09/02 15:36:42 fabiankeil
639 * Follow the OpenBSD port's lead and protect the resolve
640 * functions on OpenBSD as well.
642 * Revision 1.98 2006/08/24 11:01:34 fabiankeil
643 * --user fix. Only use the user as group if no group is specified.
644 * Solves BR 1492612. Thanks to Spinor S. and David Laight.
646 * Revision 1.97 2006/08/18 15:23:17 david__schmidt
647 * Windows service (re-)integration
651 * --install[:service_name]
652 * --uninstall[:service_name]
655 * They work as follows:
656 * --install will create a service for you and then terminate.
657 * By default the service name will be "privoxy" (without the quotes).
658 * However you can run multiple services if you wish, just by adding
659 * a colon and then a name (no spaces).
661 * --uninstall follows the exact same rules a --install.
663 * --service is used when the program is executed by the service
664 * control manager, and in normal circumstances would never be
665 * used as a command line argument.
667 * Revision 1.96 2006/08/15 20:12:36 david__schmidt
668 * Windows service integration
670 * Revision 1.95 2006/08/03 02:46:41 david__schmidt
671 * Incorporate Fabian Keil's patch work:
672 http://www.fabiankeil.de/sourcecode/privoxy/
674 * Revision 1.94 2006/07/18 14:48:46 david__schmidt
675 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
676 * with what was really the latest development (the v_3_0_branch branch)
678 * Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
679 * Thanks to Jindrich Makovicka for a race condition fix for the log
680 * file. The race condition remains for non-pthread implementations.
681 * Reference patch #1175720.
683 * Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
684 * Add the ability to check jpeg images for invalid
685 * lengths of comment blocks. Defensive strategy
686 * against the exploit:
687 * Microsoft Security Bulletin MS04-028
688 * Buffer Overrun in JPEG Processing (GDI+) Could
689 * Allow Code Execution (833987)
690 * Enabled with +inspect-jpegs in actions files.
692 * Revision 1.92.2.14 2003/12/12 12:52:53 oes
693 * - Fixed usage info for non-unix platforms
694 * - Fixed small cmdline parsing bug
696 * Revision 1.92.2.13 2003/11/27 19:20:27 oes
697 * Diagnostics: Now preserve the returncode of pthread_create
698 * in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
700 * Revision 1.92.2.12 2003/07/11 11:34:19 oes
701 * No longer ignore SIGCHLD. Fixes bug #769381
703 * Revision 1.92.2.11 2003/05/14 12:32:02 oes
704 * Close jarfile on graceful exit, remove stray line
706 * Revision 1.92.2.10 2003/05/08 15:13:46 oes
707 * Cosmetics: Killed a warning, a typo and an allocation left at exit
709 * Revision 1.92.2.9 2003/04/03 15:08:42 oes
710 * No longer rely on non-POSIX.1 extensions of getcwd().
713 * Revision 1.92.2.8 2003/03/31 13:12:32 oes
714 * Replaced setenv() by posix-compliant putenv()
715 * Thanks to Neil McCalden (nmcc AT users.sf.net).
717 * Revision 1.92.2.7 2003/03/17 16:48:59 oes
718 * Added chroot ability, thanks to patch by Sviatoslav Sviridov
720 * Revision 1.92.2.6 2003/03/11 11:55:00 oes
721 * Clean-up and extension of improvements for forked mode:
722 * - Child's return code now consists of flags RC_FLAG_*
723 * - Reporting toggle to parent now properly #ifdef'ed
724 * - Children now report blocking to parent. This enables
725 * statistics in forked mode
727 * Revision 1.92.2.5 2003/03/10 23:45:32 oes
728 * Fixed bug #700381: Non-Threaded version now capable of being toggled.
729 * Children now report having been toggled through _exit(17), parents
730 * watch for that code and toggle themselves if found.
732 * Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
733 * Wrapping all *_r functions (the non-_r versions of them) with
734 * mutex semaphores for OSX. Hopefully this will take care of all
735 * of those pesky crash reports.
737 * Revision 1.92.2.3 2003/02/28 12:53:06 oes
738 * Fixed two mostly harmless mem leaks
740 * Revision 1.92.2.2 2002/11/20 14:37:47 oes
741 * Fix: Head of global clients list now initialized to NULL
743 * Revision 1.92.2.1 2002/09/25 14:52:24 oes
744 * Added basic support for OPTIONS and TRACE HTTP methods:
745 * - New interceptor direct_response() added in chat().
746 * - sed() moved to earlier in the process, so that the
747 * Host: header is evaluated before actions and forwarding
750 * Revision 1.92 2002/05/08 16:00:46 oes
751 * Chat's buffer handling:
752 * - Fixed bug with unchecked out-of-mem conditions
753 * while reading client request & server headers
754 * - No longer predict if the buffer limit will be exceeded
755 * in the next read -- check add_to_iob's new
756 * return code. If buffer couldn't be extended
757 * (policy or out-of-mem) while
758 * - reading from client: abort
759 * - reading server headers: send error page
760 * - buffering server body for filter: flush,
761 * and if that fails: send error page
763 * Revision 1.91 2002/04/08 20:35:58 swa
766 * Revision 1.90 2002/04/02 14:57:28 oes
767 * Made sending wafers independent of FEATURE_COOKIE_JAR
769 * Revision 1.89 2002/03/31 17:18:59 jongfoster
770 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
772 * Revision 1.88 2002/03/27 14:32:43 david__schmidt
773 * More compiler warning message maintenance
775 * Revision 1.87 2002/03/26 22:29:54 swa
776 * we have a new homepage!
778 * Revision 1.86 2002/03/25 17:04:55 david__schmidt
779 * Workaround for closing the jarfile before load_config() comes around again
781 * Revision 1.85 2002/03/24 15:23:33 jongfoster
784 * Revision 1.84 2002/03/24 13:25:43 swa
785 * name change related issues
787 * Revision 1.83 2002/03/16 23:54:06 jongfoster
788 * Adding graceful termination feature, to help look for memory leaks.
789 * If you enable this (which, by design, has to be done by hand
790 * editing config.h) and then go to http://i.j.b/die, then the program
791 * will exit cleanly after the *next* request. It should free all the
792 * memory that was used.
794 * Revision 1.82 2002/03/13 00:27:05 jongfoster
797 * Revision 1.81 2002/03/12 01:42:50 oes
798 * Introduced modular filters
800 * Revision 1.80 2002/03/11 22:07:05 david__schmidt
801 * OS/2 port maintenance:
802 * - Fixed EMX build - it had decayed a little
803 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
804 * substituted a memset for now.
806 * Revision 1.79 2002/03/09 20:03:52 jongfoster
807 * - Making various functions return int rather than size_t.
808 * (Undoing a recent change). Since size_t is unsigned on
809 * Windows, functions like read_socket that return -1 on
810 * error cannot return a size_t.
812 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
813 * crashes, and also frequently caused JB to jump to 100%
814 * CPU and stay there. (Because it thought it had just
815 * read ((unsigned)-1) == 4Gb of data...)
817 * - The signature of write_socket has changed, it now simply
818 * returns success=0/failure=nonzero.
820 * - Trying to get rid of a few warnings --with-debug on
821 * Windows, I've introduced a new type "jb_socket". This is
822 * used for the socket file descriptors. On Windows, this
823 * is SOCKET (a typedef for unsigned). Everywhere else, it's
824 * an int. The error value can't be -1 any more, so it's
825 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
826 * Windows it maps to the #define INVALID_SOCKET.)
828 * - The signature of bind_port has changed.
830 * Revision 1.78 2002/03/08 21:35:04 oes
831 * Added optional group supplement to --user option. Will now use default group of user if no group given
833 * Revision 1.77 2002/03/07 03:52:06 oes
834 * - Fixed compiler warnings etc
835 * - Improved handling of failed DNS lookups
837 * Revision 1.76 2002/03/06 22:54:35 jongfoster
838 * Automated function-comment nitpicking.
840 * Revision 1.75 2002/03/06 10:02:19 oes
841 * Fixed stupid bug when --user was not given
843 * Revision 1.74 2002/03/06 00:49:31 jongfoster
844 * Fixing warning on Windows
845 * Making #ifdefs that refer to the same variable consistently
846 * use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
848 * Revision 1.73 2002/03/05 23:57:30 hal9
849 * Stray character 's' on line 1618 was breaking build.
851 * Revision 1.72 2002/03/05 21:33:45 david__schmidt
852 * - Re-enable OS/2 building after new parms were added
853 * - Fix false out of memory report when resolving CGI templates when no IP
854 * address is available of failed attempt (a la no such domain)
856 * Revision 1.71 2002/03/05 18:13:56 oes
857 * Added --user option
859 * Revision 1.70 2002/03/05 04:52:42 oes
860 * Deleted non-errlog debugging code
862 * Revision 1.69 2002/03/04 23:50:00 jongfoster
863 * Splitting off bind_port() call into bind_port_helper(), with
866 * Revision 1.68 2002/03/04 20:17:32 oes
869 * Revision 1.67 2002/03/04 18:18:57 oes
870 * - Removed _DEBUG mode
871 * - Cleand up cmdline parsing
872 * - Introduced --no-daemon, --pidfile options
873 * - Cleaned up signal handling:
874 * - Terminate cleanly on INT, TERM and ABRT
875 * - Schedule logfile for re-opening on HUP
876 * - Ignore CHLD and PIPE
877 * - Leave the rest with their default handlers
878 * - Uniform handler registration
879 * - Added usage() function
880 * - Played styleguide police
882 * Revision 1.66 2002/03/03 15:06:55 oes
883 * Re-enabled automatic config reloading
885 * Revision 1.65 2002/03/03 14:49:11 oes
886 * Fixed CLF logging: Now uses client's original HTTP request
888 * Revision 1.64 2002/03/03 09:18:03 joergs
889 * Made jumbjuster work on AmigaOS again.
891 * Revision 1.63 2002/03/02 04:14:50 david__schmidt
892 * Clean up a little CRLF unpleasantness that suddenly appeared
894 * Revision 1.62 2002/02/20 23:17:23 jongfoster
895 * Detecting some out-of memory conditions and exiting with a log message.
897 * Revision 1.61 2002/01/17 21:01:52 jongfoster
898 * Moving all our URL and URL pattern parsing code to urlmatch.c.
900 * Revision 1.60 2001/12/30 14:07:32 steudten
901 * - Add signal handling (unix)
902 * - Add SIGHUP handler (unix)
903 * - Add creation of pidfile (unix)
904 * - Add action 'top' in rc file (RH)
905 * - Add entry 'SIGNALS' to manpage
906 * - Add exit message to logfile (unix)
908 * Revision 1.59 2001/12/13 14:07:18 oes
909 * Fixed Bug: 503 error page now sent OK
911 * Revision 1.58 2001/11/30 23:37:24 jongfoster
912 * Renaming the Win32 config file to config.txt - this is almost the
913 * same as the corresponding UNIX name "config"
915 * Revision 1.57 2001/11/16 00:47:43 jongfoster
916 * Changing the tty-disconnection code to use setsid().
918 * Revision 1.56 2001/11/13 20:20:54 jongfoster
919 * Tabs->spaces, fixing a bug with missing {} around an if()
921 * Revision 1.55 2001/11/13 20:14:53 jongfoster
922 * Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
924 * Revision 1.54 2001/11/07 00:03:14 steudten
925 * Give reliable return value if an error
926 * occurs not just 0 with new daemon mode.
928 * Revision 1.53 2001/11/05 21:41:43 steudten
929 * Add changes to be a real daemon just for unix os.
930 * (change cwd to /, detach from controlling tty, set
931 * process group and session leader to the own process.
933 * Add some fatal-error log message for failed malloc().
934 * Add '-d' if compiled with 'configure --with-debug' to
935 * enable debug output.
937 * Revision 1.52 2001/10/26 20:11:20 jongfoster
938 * Fixing type mismatch
940 * Revision 1.51 2001/10/26 17:38:28 oes
943 * Revision 1.50 2001/10/25 03:40:48 david__schmidt
944 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
945 * threads to call select() simultaneously. So, it's time to do a real, live,
946 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
947 * (native). Both versions will work, but using __OS2__ offers multi-threading.
949 * Revision 1.49 2001/10/23 21:41:35 jongfoster
950 * Added call to initialize the (statically-allocated of course)
951 * "out of memory" CGI response.
953 * Revision 1.48 2001/10/10 19:56:46 jongfoster
954 * Moving some code that wasn't cookie-related out of an #ifdef
957 * Revision 1.47 2001/10/10 16:44:36 oes
958 * Added CONNECT destination port limitation check
960 * Revision 1.46 2001/10/08 15:17:41 oes
961 * Re-enabled SSL forwarding
963 * Revision 1.45 2001/10/07 15:42:11 oes
964 * Replaced 6 boolean members of csp with one bitmap (csp->flags)
966 * Moved downgrading of the HTTP version from parse_http_request to
967 * chat(), since we can't decide if it is necessary before we have
968 * determined the actions for the URL. The HTTP command is now
969 * *always* re-built so the repairs need no longer be special-cased.
971 * filter_popups now gets a csp pointer so it can raise the new
972 * CSP_FLAG_MODIFIED flag.
976 * Added configurable size limit for the IOB. If the IOB grows so
977 * large that the next read would exceed the limit, the header
978 * is generated, and the header & unfiltered buffer are flushed
979 * to the client. Chat then continues in non-buffering,
980 * non-filtering body mode.
982 * Revision 1.44 2001/10/02 18:13:57 oes
985 * Revision 1.43 2001/10/02 15:32:13 oes
986 * Moved generation of hdr
988 * Revision 1.42 2001/09/21 23:02:02 david__schmidt
989 * Cleaning up 2 compiler warnings on OS/2.
991 * Revision 1.41 2001/09/16 17:05:14 jongfoster
992 * Removing unused #include showarg.h
994 * Revision 1.40 2001/09/16 15:41:45 jongfoster
995 * Fixing signed/unsigned comparison warning.
997 * Revision 1.39 2001/09/16 13:21:27 jongfoster
998 * Changes to use new list functions.
1000 * Revision 1.38 2001/09/16 13:01:46 jongfoster
1001 * Removing redundant function call that zeroed zalloc()'d memory.
1003 * Revision 1.37 2001/09/10 11:12:24 oes
1004 * Deleted unused variable
1006 * Revision 1.36 2001/09/10 10:56:15 oes
1007 * Silenced compiler warnings
1009 * Revision 1.35 2001/07/31 14:44:22 oes
1010 * Deleted unused size parameter from filter_popups()
1012 * Revision 1.34 2001/07/30 22:08:36 jongfoster
1013 * Tidying up #defines:
1014 * - All feature #defines are now of the form FEATURE_xxx
1015 * - Permanently turned off WIN_GUI_EDIT
1016 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
1018 * Revision 1.33 2001/07/29 19:32:00 jongfoster
1019 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
1021 * Revision 1.32 2001/07/29 18:47:05 jongfoster
1022 * Adding missing #include "loadcfg.h"
1024 * Revision 1.31 2001/07/29 12:17:48 oes
1025 * Applied pthread fix by Paul Lieverse
1027 * Revision 1.30 2001/07/25 22:57:13 jongfoster
1028 * __BEOS__ no longer overrides FEATURE_PTHREAD.
1029 * This is because FEATURE_PTHREAD will soon be widely used, so I
1030 * want to keep it simple.
1032 * Revision 1.29 2001/07/24 12:47:06 oes
1033 * Applied BeOS support update by Eugenia
1035 * Revision 1.28 2001/07/23 13:26:12 oes
1036 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
1038 * Revision 1.27 2001/07/19 19:09:47 haroon
1039 * - Added code to take care of the situation where while processing the first
1040 * server response (which includes the server header), after finding the end
1041 * of the headers we were not looking past the end of the headers for
1042 * content modification. I enabled it for filter_popups.
1043 * Someone else should look to see if other similar operations should be
1044 * done to the discarded portion of the buffer.
1046 * Note 2001/07/20: No, the other content modification mechanisms will process
1047 * the whole iob later anyway. --oes
1049 * Revision 1.26 2001/07/18 12:31:36 oes
1052 * Revision 1.25 2001/07/15 19:43:49 jongfoster
1053 * Supports POSIX threads.
1054 * Also removed some unused #includes.
1056 * Revision 1.24 2001/07/13 14:00:40 oes
1057 * - Generic content modification scheme:
1058 * Each feature has its own applicability flag that is set
1059 * from csp->action->flags.
1060 * Replaced the "filtering" int flag , by a function pointer
1061 * "content_filter" to the function that will do the content
1062 * modification. If it is != NULL, the document will be buffered
1063 * and processed through *content_filter, which must set
1064 * csp->content_length and return a modified copy of the body
1065 * or return NULL (on failiure).
1066 * - Changed csp->is_text to the more generic bitmap csp->content_type
1067 * which can currently take the valued CT_TEXT or CT_GIF
1068 * - Reformatting etc
1069 * - Removed all #ifdef PCRS
1071 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
1072 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
1073 * the `block_acl' call. This prevents a compilation error when the user
1074 * does not wish to use the "ACL" feature.
1076 * Revision 1.22 2001/06/29 21:45:41 oes
1077 * Indentation, CRLF->LF, Tab-> Space
1079 * Revision 1.21 2001/06/29 13:29:36 oes
1080 * - Cleaned up, improved comments
1081 * - Unified all possible interceptors (CGI,
1082 * block, trust, fast_redirect) in one
1083 * place, with one (CGI) answer generation
1084 * mechansim. Much clearer now.
1085 * - Removed the GIF image generation, which
1086 * is now done in filters.c:block_url()
1087 * - Made error conditions like domain lookup
1088 * failiure or (various) problems while talking
1089 * to the server use cgi.c:error_response()
1090 * instead of generating HTML/HTTP in chat() (yuck!)
1091 * - Removed logentry from cancelled commit
1093 * Revision 1.20 2001/06/09 10:55:28 jongfoster
1094 * Changing BUFSIZ ==> BUFFER_SIZE
1096 * Revision 1.19 2001/06/07 23:12:52 jongfoster
1097 * Replacing function pointer in struct gateway with a directly
1098 * called function forwarded_connect().
1099 * Replacing struct gateway with struct forward_spec
1101 * Revision 1.18 2001/06/03 19:12:16 oes
1102 * introduced new cgi handling
1104 * Revision 1.17 2001/06/01 20:07:23 jongfoster
1105 * Now uses action +image-blocker{} rather than config->tinygif
1107 * Revision 1.16 2001/06/01 18:49:17 jongfoster
1108 * Replaced "list_share" with "list" - the tiny memory gain was not
1109 * worth the extra complexity.
1111 * Revision 1.15 2001/05/31 21:24:47 jongfoster
1112 * Changed "permission" to "action" throughout.
1113 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
1114 * Moved vanilla wafer check into chat(), since we must now
1115 * decide whether or not to add it based on the URL.
1117 * Revision 1.14 2001/05/29 20:14:01 joergs
1118 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
1121 * Revision 1.13 2001/05/29 09:50:24 jongfoster
1122 * Unified blocklist/imagelist/permissionslist.
1123 * File format is still under discussion, but the internal changes
1124 * are (mostly) done.
1126 * Also modified interceptor behaviour:
1127 * - We now intercept all URLs beginning with one of the following
1128 * prefixes (and *only* these prefixes):
1130 * * http://ijbswa.sf.net/config/
1131 * * http://ijbswa.sourceforge.net/config/
1132 * - New interceptors "home page" - go to http://i.j.b/ to see it.
1133 * - Internal changes so that intercepted and fast redirect pages
1134 * are not replaced with an image.
1135 * - Interceptors now have the option to send a binary page direct
1136 * to the client. (i.e. ijb-send-banner uses this)
1137 * - Implemented show-url-info interceptor. (Which is why I needed
1138 * the above interceptors changes - a typical URL is
1139 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
1140 * The previous mechanism would not have intercepted that, and
1141 * if it had been intercepted then it then it would have replaced
1142 * it with an image.)
1144 * Revision 1.12 2001/05/27 22:17:04 oes
1146 * - re_process_buffer no longer writes the modified buffer
1147 * to the client, which was very ugly. It now returns the
1148 * buffer, which it is then written by chat.
1150 * - content_length now adjusts the Content-Length: header
1151 * for modified documents rather than crunch()ing it.
1152 * (Length info in csp->content_length, which is 0 for
1153 * unmodified documents)
1155 * - For this to work, sed() is called twice when filtering.
1157 * Revision 1.11 2001/05/26 17:27:53 jongfoster
1158 * Added support for CLF and fixed LOG_LEVEL_LOG.
1159 * Also did CRLF->LF fix of my previous patch.
1161 * Revision 1.10 2001/05/26 15:26:15 jongfoster
1162 * ACL feature now provides more security by immediately dropping
1163 * connections from untrusted hosts.
1165 * Revision 1.9 2001/05/26 00:28:36 jongfoster
1166 * Automatic reloading of config file.
1167 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
1168 * Most of the global variables have been moved to a new
1169 * struct configuration_spec, accessed through csp->config->globalname
1170 * Most of the globals remaining are used by the Win32 GUI.
1172 * Revision 1.8 2001/05/25 22:43:18 jongfoster
1173 * Fixing minor memory leak and buffer overflow.
1175 * Revision 1.7 2001/05/25 22:34:30 jongfoster
1178 * Revision 1.6 2001/05/23 00:13:58 joergs
1179 * AmigaOS support fixed.
1181 * Revision 1.5 2001/05/22 18:46:04 oes
1183 * - Enabled filtering banners by size rather than URL
1184 * by adding patterns that replace all standard banner
1185 * sizes with the "Junkbuster" gif to the re_filterfile
1187 * - Enabled filtering WebBugs by providing a pattern
1188 * which kills all 1x1 images
1190 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
1191 * which is selected by the (nonstandard and therefore
1192 * capital) letter 'U' in the option string.
1193 * It causes the quantifiers to be ungreedy by default.
1194 * Appending a ? turns back to greedy (!).
1196 * - Added a new interceptor ijb-send-banner, which
1197 * sends back the "Junkbuster" gif. Without imagelist or
1198 * MSIE detection support, or if tinygif = 1, or the
1199 * URL isn't recognized as an imageurl, a lame HTML
1200 * explanation is sent instead.
1202 * - Added new feature, which permits blocking remote
1203 * script redirects and firing back a local redirect
1205 * The feature is conditionally compiled, i.e. it
1206 * can be disabled with --disable-fast-redirects,
1207 * plus it must be activated by a "fast-redirects"
1208 * line in the config file, has its own log level
1209 * and of course wants to be displayed by show-proxy-args
1210 * Note: Boy, all the #ifdefs in 1001 locations and
1211 * all the fumbling with configure.in and acconfig.h
1212 * were *way* more work than the feature itself :-(
1214 * - Because a generic redirect template was needed for
1215 * this, tinygif = 3 now uses the same.
1217 * - Moved GIFs, and other static HTTP response templates
1220 * - Some minor fixes
1222 * - Removed some >400 CRs again (Jon, you really worked
1225 * Revision 1.4 2001/05/21 19:34:01 jongfoster
1226 * Made failure to bind() a fatal error.
1228 * Revision 1.3 2001/05/20 01:21:20 jongfoster
1229 * Version 2.9.4 checkin.
1230 * - Merged popupfile and cookiefile, and added control over PCRS
1231 * filtering, in new "permissionsfile".
1232 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
1233 * file error you now get a message box (in the Win32 GUI) rather
1234 * than the program exiting with no explanation.
1235 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
1237 * - Removed tabs from "config"
1238 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
1239 * - Bumped up version number.
1241 * Revision 1.2 2001/05/17 22:34:44 oes
1242 * - Added hint on GIF char array generation to jcc.c
1243 * - Cleaned CRLF's from the sources and related files
1244 * - Repaired logging for REF and FRC
1246 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
1247 * Initial import of version 2.9.3 source tree
1250 *********************************************************************/
1256 #include <sys/types.h>
1265 # ifndef FEATURE_PTHREAD
1269 # include <windows.h>
1270 # include <process.h>
1271 # endif /* ndef FEATURE_PTHREAD */
1274 # ifndef _WIN_CONSOLE
1275 # include "w32log.h"
1276 # endif /* ndef _WIN_CONSOLE */
1277 # include "w32svrapi.h"
1279 #else /* ifndef _WIN32 */
1281 # if !defined (__OS2__)
1282 # include <unistd.h>
1283 # include <sys/wait.h>
1284 # endif /* ndef __OS2__ */
1285 # include <sys/time.h>
1286 # include <sys/stat.h>
1287 # include <sys/ioctl.h>
1290 #include <sys/termios.h>
1298 # include <signal.h>
1301 # include <socket.h> /* BeOS has select() for sockets only. */
1302 # include <OS.h> /* declarations for threads and stuff. */
1305 # if defined(__EMX__) || defined(__OS2__)
1306 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
1311 #define bzero(B,N) memset(B,0x00,n)
1315 # include <select.h>
1320 #include "project.h"
1323 #include "filters.h"
1324 #include "loaders.h"
1325 #include "parsers.h"
1326 #include "miscutil.h"
1328 #include "jbsockets.h"
1329 #include "gateway.h"
1330 #include "actions.h"
1332 #include "loadcfg.h"
1333 #include "urlmatch.h"
1335 const char jcc_h_rcs[] = JCC_H_VERSION;
1336 const char project_h_rcs[] = PROJECT_H_VERSION;
1339 struct client_state clients[1];
1340 struct file_list files[1];
1342 #ifdef FEATURE_STATISTICS
1343 int urls_read = 0; /* total nr of urls read inc rejected */
1344 int urls_rejected = 0; /* total nr of urls rejected */
1345 #endif /* def FEATURE_STATISTICS */
1347 #ifdef FEATURE_GRACEFUL_TERMINATION
1348 int g_terminate = 0;
1351 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1352 static void sig_handler(int the_signal);
1354 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
1355 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
1356 static jb_err get_server_headers(struct client_state *csp);
1357 static const char *crunch_reason(const struct http_response *rsp);
1358 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
1359 static char *get_request_line(struct client_state *csp);
1360 static jb_err receive_client_request(struct client_state *csp);
1361 static jb_err parse_client_request(struct client_state *csp);
1362 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
1363 static jb_err change_request_destination(struct client_state *csp);
1364 static void chat(struct client_state *csp);
1365 static void serve(struct client_state *csp);
1366 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1367 static void usage(const char *myname);
1369 static void initialize_mutexes(void);
1370 static jb_socket bind_port_helper(struct configuration_spec *config);
1371 static void listen_loop(void);
1374 void serve(struct client_state *csp);
1375 #else /* ifndef AMIGA */
1376 static void serve(struct client_state *csp);
1377 #endif /* def AMIGA */
1380 static int32 server_thread(void *data);
1381 #endif /* def __BEOS__ */
1384 #define sleep(N) Sleep(((N) * 1000))
1388 #define sleep(N) DosSleep(((N) * 100))
1391 #ifdef MUTEX_LOCKS_AVAILABLE
1393 * XXX: Does the locking stuff really belong in this file?
1395 privoxy_mutex_t log_mutex;
1396 privoxy_mutex_t log_init_mutex;
1397 privoxy_mutex_t connection_reuse_mutex;
1399 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
1400 privoxy_mutex_t resolver_mutex;
1401 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
1403 #ifndef HAVE_GMTIME_R
1404 privoxy_mutex_t gmtime_mutex;
1405 #endif /* ndef HAVE_GMTIME_R */
1407 #ifndef HAVE_LOCALTIME_R
1408 privoxy_mutex_t localtime_mutex;
1409 #endif /* ndef HAVE_GMTIME_R */
1412 privoxy_mutex_t rand_mutex;
1413 #endif /* ndef HAVE_RANDOM */
1415 #endif /* def MUTEX_LOCKS_AVAILABLE */
1418 const char *basedir = NULL;
1419 const char *pidfile = NULL;
1420 static int received_hup_signal = 0;
1421 #endif /* defined unix */
1423 /* HTTP snipplets. */
1424 static const char CSUCCEED[] =
1425 "HTTP/1.0 200 Connection established\r\n"
1426 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
1428 static const char CHEADER[] =
1429 "HTTP/1.0 400 Invalid header received from client\r\n"
1430 "Proxy-Agent: Privoxy " VERSION "\r\n"
1431 "Content-Type: text/plain\r\n"
1432 "Connection: close\r\n\r\n"
1433 "Invalid header received from client.\r\n";
1435 static const char FTP_RESPONSE[] =
1436 "HTTP/1.0 400 Invalid request received from client\r\n"
1437 "Content-Type: text/plain\r\n"
1438 "Connection: close\r\n\r\n"
1439 "Invalid request. Privoxy doesn't support FTP.\r\n";
1441 static const char GOPHER_RESPONSE[] =
1442 "HTTP/1.0 400 Invalid request received from client\r\n"
1443 "Content-Type: text/plain\r\n"
1444 "Connection: close\r\n\r\n"
1445 "Invalid request. Privoxy doesn't support gopher.\r\n";
1447 /* XXX: should be a template */
1448 static const char MISSING_DESTINATION_RESPONSE[] =
1449 "HTTP/1.0 400 Bad request received from client\r\n"
1450 "Proxy-Agent: Privoxy " VERSION "\r\n"
1451 "Content-Type: text/plain\r\n"
1452 "Connection: close\r\n\r\n"
1453 "Bad request. Privoxy was unable to extract the destination.\r\n";
1455 /* XXX: should be a template */
1456 static const char NO_SERVER_DATA_RESPONSE[] =
1457 "HTTP/1.0 502 Server or forwarder response empty\r\n"
1458 "Proxy-Agent: Privoxy " VERSION "\r\n"
1459 "Content-Type: text/plain\r\n"
1460 "Connection: close\r\n\r\n"
1461 "Empty server or forwarder response.\r\n"
1462 "The connection has been closed but Privoxy didn't receive any data.\r\n";
1464 /* XXX: should be a template */
1465 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
1466 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
1467 "Proxy-Agent: Privoxy " VERSION "\r\n"
1468 "Content-Type: text/plain\r\n"
1469 "Connection: close\r\n\r\n"
1470 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
1473 /* XXX: should be a template */
1474 static const char NULL_BYTE_RESPONSE[] =
1475 "HTTP/1.0 400 Bad request received from client\r\n"
1476 "Proxy-Agent: Privoxy " VERSION "\r\n"
1477 "Content-Type: text/plain\r\n"
1478 "Connection: close\r\n\r\n"
1479 "Bad request. Null byte(s) before end of request.\r\n";
1482 /* XXX: should be a template */
1483 static const char MESSED_UP_REQUEST_RESPONSE[] =
1484 "HTTP/1.0 400 Malformed request after rewriting\r\n"
1485 "Proxy-Agent: Privoxy " VERSION "\r\n"
1486 "Content-Type: text/plain\r\n"
1487 "Connection: close\r\n\r\n"
1488 "Bad request. Messed up with header filters.\r\n";
1490 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
1491 "HTTP/1.0 503 Too many open connections\r\n"
1492 "Proxy-Agent: Privoxy " VERSION "\r\n"
1493 "Content-Type: text/plain\r\n"
1494 "Connection: close\r\n\r\n"
1495 "Maximum number of open connections reached.\r\n";
1497 /* XXX: should be a template */
1498 static const char CONNECTION_TIMEOUT_RESPONSE[] =
1499 "HTTP/1.0 504 Connection timeout\r\n"
1500 "Proxy-Agent: Privoxy " VERSION "\r\n"
1501 "Content-Type: text/plain\r\n"
1502 "Connection: close\r\n\r\n"
1503 "The connection timed out.\r\n";
1505 /* A function to crunch a response */
1506 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
1508 /* Crunch function flags */
1509 #define CF_NO_FLAGS 0
1510 /* Cruncher applies to forced requests as well */
1511 #define CF_IGNORE_FORCE 1
1512 /* Crunched requests are counted for the block statistics */
1513 #define CF_COUNT_AS_REJECT 2
1515 /* A crunch function and its flags */
1518 const crunch_func_ptr cruncher;
1522 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
1524 /* Complete list of cruncher functions */
1525 static const struct cruncher crunchers_all[] = {
1526 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
1527 { block_url, CF_COUNT_AS_REJECT },
1528 #ifdef FEATURE_TRUST
1529 { trust_url, CF_COUNT_AS_REJECT },
1530 #endif /* def FEATURE_TRUST */
1531 { redirect_url, CF_NO_FLAGS },
1532 { dispatch_cgi, CF_IGNORE_FORCE},
1536 /* Light version, used after tags are applied */
1537 static const struct cruncher crunchers_light[] = {
1538 { block_url, CF_COUNT_AS_REJECT },
1539 { redirect_url, CF_NO_FLAGS },
1545 * XXX: Don't we really mean
1551 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
1552 /*********************************************************************
1554 * Function : sig_handler
1556 * Description : Signal handler for different signals.
1557 * Exit gracefully on TERM and INT
1558 * or set a flag that will cause the errlog
1559 * to be reopened by the main thread on HUP.
1562 * 1 : the_signal = the signal cause this function to call
1566 *********************************************************************/
1567 static void sig_handler(int the_signal)
1573 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
1585 received_hup_signal = 1;
1591 * We shouldn't be here, unless we catch signals
1592 * in main() that we can't handle here!
1594 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
1602 /*********************************************************************
1604 * Function : client_protocol_is_unsupported
1606 * Description : Checks if the client used a known unsupported
1607 * protocol and deals with it by sending an error
1611 * 1 : csp = Current client state (buffers, headers, etc...)
1612 * 2 : req = the first request line send by the client
1614 * Returns : TRUE if an error response has been generated, or
1615 * FALSE if the request doesn't look invalid.
1617 *********************************************************************/
1618 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
1621 * If it's a FTP or gopher request, we don't support it.
1623 * These checks are better than nothing, but they might
1624 * not work in all configurations and some clients might
1625 * have problems digesting the answer.
1627 * They should, however, never cause more problems than
1628 * Privoxy's old behaviour (returning the misleading HTML
1631 * "Could not resolve http://(ftp|gopher)://example.org").
1633 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
1635 const char *response = NULL;
1636 const char *protocol = NULL;
1638 if (!strncmpic(req, "GET ftp://", 10))
1640 response = FTP_RESPONSE;
1645 response = GOPHER_RESPONSE;
1646 protocol = "GOPHER";
1648 log_error(LOG_LEVEL_ERROR,
1649 "%s tried to use Privoxy as %s proxy: %s",
1650 csp->ip_addr_str, protocol, req);
1651 log_error(LOG_LEVEL_CLF,
1652 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
1654 write_socket(csp->cfd, response, strlen(response));
1663 /*********************************************************************
1665 * Function : get_request_destination_elsewhere
1667 * Description : If the client's request was redirected into
1668 * Privoxy without the client's knowledge,
1669 * the request line lacks the destination host.
1671 * This function tries to get it elsewhere,
1672 * provided accept-intercepted-requests is enabled.
1674 * "Elsewhere" currently only means "Host: header",
1675 * but in the future we may ask the redirecting
1676 * packet filter to look the destination up.
1678 * If the destination stays unknown, an error
1679 * response is send to the client and headers
1680 * are freed so that chat() can return directly.
1683 * 1 : csp = Current client state (buffers, headers, etc...)
1684 * 2 : headers = a header list
1686 * Returns : JB_ERR_OK if the destination is now known, or
1687 * JB_ERR_PARSE if it isn't.
1689 *********************************************************************/
1690 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
1694 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
1696 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
1697 " Privoxy isn't configured to accept intercepted requests.",
1698 csp->ip_addr_str, csp->http->cmd);
1699 /* XXX: Use correct size */
1700 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1701 csp->ip_addr_str, csp->http->cmd);
1703 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1704 destroy_list(headers);
1706 return JB_ERR_PARSE;
1708 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
1710 /* Split the domain we just got for pattern matching */
1711 init_domain_components(csp->http);
1717 /* We can't work without destination. Go spread the news.*/
1719 req = list_to_text(headers);
1721 /* XXX: Use correct size */
1722 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1723 csp->ip_addr_str, csp->http->cmd);
1724 log_error(LOG_LEVEL_ERROR,
1725 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
1726 csp->ip_addr_str, csp->http->cmd, req);
1729 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
1730 destroy_list(headers);
1732 return JB_ERR_PARSE;
1735 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
1736 * to get the destination IP address, use it as host directly
1737 * or do a reverse DNS lookup first.
1742 /*********************************************************************
1744 * Function : get_server_headers
1746 * Description : Parses server headers in iob and fills them
1747 * into csp->headers so that they can later be
1751 * 1 : csp = Current client state (buffers, headers, etc...)
1753 * Returns : JB_ERR_OK if everything went fine, or
1754 * JB_ERR_PARSE if the headers were incomplete.
1756 *********************************************************************/
1757 static jb_err get_server_headers(struct client_state *csp)
1759 int continue_hack_in_da_house = 0;
1762 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
1767 * continue hack in da house. Ignore the ending of
1768 * this head and continue enlisting header lines.
1769 * The reason is described below.
1771 enlist(csp->headers, "");
1772 continue_hack_in_da_house = 0;
1775 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
1778 * It's a bodyless continue response, don't
1779 * stop header parsing after reaching its end.
1781 * As a result Privoxy will concatenate the
1782 * next response's head and parse and deliver
1783 * the headers as if they belonged to one request.
1785 * The client will separate them because of the
1786 * empty line between them.
1788 * XXX: What we're doing here is clearly against
1789 * the intended purpose of the continue header,
1790 * and under some conditions (HTTP/1.0 client request)
1791 * it's a standard violation.
1793 * Anyway, "sort of against the spec" is preferable
1794 * to "always getting confused by Continue responses"
1795 * (Privoxy's behaviour before this hack was added)
1797 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
1798 continue_hack_in_da_house = 1;
1800 else if (*header == '\0')
1803 * If the header is empty, but the Continue hack
1804 * isn't active, we can assume that we reached the
1805 * end of the buffer before we hit the end of the
1808 * Inform the caller an let it decide how to handle it.
1810 return JB_ERR_PARSE;
1813 if (JB_ERR_MEMORY == enlist(csp->headers, header))
1816 * XXX: Should we quit the request and return a
1817 * out of memory error page instead?
1819 log_error(LOG_LEVEL_ERROR,
1820 "Out of memory while enlisting server headers. %s lost.",
1830 /*********************************************************************
1832 * Function : crunch_reason
1834 * Description : Translates the crunch reason code into a string.
1837 * 1 : rsp = a http_response
1839 * Returns : A string with the crunch reason or an error description.
1841 *********************************************************************/
1842 static const char *crunch_reason(const struct http_response *rsp)
1844 char * reason = NULL;
1846 assert(rsp != NULL);
1849 return "Internal error while searching for crunch reason";
1852 switch (rsp->reason)
1854 case RSP_REASON_UNSUPPORTED:
1855 reason = "Unsupported HTTP feature";
1857 case RSP_REASON_BLOCKED:
1860 case RSP_REASON_UNTRUSTED:
1861 reason = "Untrusted";
1863 case RSP_REASON_REDIRECTED:
1864 reason = "Redirected";
1866 case RSP_REASON_CGI_CALL:
1867 reason = "CGI Call";
1869 case RSP_REASON_NO_SUCH_DOMAIN:
1870 reason = "DNS failure";
1872 case RSP_REASON_FORWARDING_FAILED:
1873 reason = "Forwarding failed";
1875 case RSP_REASON_CONNECT_FAILED:
1876 reason = "Connection failure";
1878 case RSP_REASON_OUT_OF_MEMORY:
1879 reason = "Out of memory (may mask other reasons)";
1882 reason = "No reason recorded";
1890 /*********************************************************************
1892 * Function : send_crunch_response
1894 * Description : Delivers already prepared response for
1895 * intercepted requests, logs the interception
1896 * and frees the response.
1899 * 1 : csp = Current client state (buffers, headers, etc...)
1900 * 1 : rsp = Fully prepared response. Will be freed on exit.
1902 * Returns : Nothing.
1904 *********************************************************************/
1905 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
1907 const struct http_request *http = csp->http;
1908 char status_code[4];
1910 assert(rsp != NULL);
1911 assert(rsp->head != NULL);
1916 * Not supposed to happen. If it does
1917 * anyway, treat it as an unknown error.
1919 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
1920 /* return code doesn't matter */
1925 /* If rsp is still NULL, we have serious internal problems. */
1926 log_error(LOG_LEVEL_FATAL,
1927 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
1931 * Extract the status code from the actual head
1932 * that was send to the client. It is the only
1933 * way to get it right for all requests, including
1934 * the fixed ones for out-of-memory problems.
1936 * A head starts like this: 'HTTP/1.1 200...'
1940 status_code[0] = rsp->head[9];
1941 status_code[1] = rsp->head[10];
1942 status_code[2] = rsp->head[11];
1943 status_code[3] = '\0';
1945 /* Write the answer to the client */
1946 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
1947 || write_socket(csp->cfd, rsp->body, rsp->content_length))
1949 /* There is nothing we can do about it. */
1950 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
1953 /* Log that the request was crunched and why. */
1954 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
1955 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
1956 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
1958 /* Clean up and return */
1959 if (cgi_error_memory() != rsp)
1961 free_http_response(rsp);
1968 /*********************************************************************
1970 * Function : request_contains_null_bytes
1972 * Description : Checks for NULL bytes in the request and sends
1973 * an error message to the client if any were found.
1975 * XXX: currently not used, see comment in chat().
1978 * 1 : csp = Current client state (buffers, headers, etc...)
1979 * 2 : buf = Data from the client's request to check.
1980 * 3 : len = The data length.
1982 * Returns : TRUE if the request contained one or more NULL bytes, or
1985 *********************************************************************/
1986 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
1988 size_t c_len; /* Request lenght when treated as C string */
1990 c_len = strlen(buf);
1995 * Null byte(s) found. Log the request,
1996 * return an error response and hang up.
1998 size_t tmp_len = c_len;
2003 * Replace NULL byte(s) with '°' characters
2004 * so the request can be logged as string.
2005 * XXX: Is there a better replacement character?
2008 tmp_len += strlen(buf+tmp_len);
2009 } while (tmp_len < len);
2011 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
2012 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
2013 log_error(LOG_LEVEL_HEADER,
2014 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
2016 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
2018 /* XXX: Log correct size */
2019 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2029 /*********************************************************************
2031 * Function : crunch_response_triggered
2033 * Description : Checks if the request has to be crunched,
2034 * and delivers the crunch response if necessary.
2037 * 1 : csp = Current client state (buffers, headers, etc...)
2038 * 2 : crunchers = list of cruncher functions to run
2040 * Returns : TRUE if the request was answered with a crunch response
2043 *********************************************************************/
2044 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
2046 struct http_response *rsp = NULL;
2047 const struct cruncher *c;
2050 * If CGI request crunching is disabled,
2051 * check the CGI dispatcher out of order to
2052 * prevent unintentional blocks or redirects.
2054 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
2055 && (NULL != (rsp = dispatch_cgi(csp))))
2057 /* Deliver, log and free the interception response. */
2058 send_crunch_response(csp, rsp);
2062 for (c = crunchers; c->cruncher != NULL; c++)
2065 * Check the cruncher if either Privoxy is toggled
2066 * on and the request isn't forced, or if the cruncher
2067 * applies to forced requests as well.
2069 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
2070 !(csp->flags & CSP_FLAG_FORCED)) ||
2071 (c->flags & CF_IGNORE_FORCE))
2073 rsp = c->cruncher(csp);
2076 /* Deliver, log and free the interception response. */
2077 send_crunch_response(csp, rsp);
2078 #ifdef FEATURE_STATISTICS
2079 if (c->flags & CF_COUNT_AS_REJECT)
2081 csp->flags |= CSP_FLAG_REJECTED;
2083 #endif /* def FEATURE_STATISTICS */
2094 /*********************************************************************
2096 * Function : build_request_line
2098 * Description : Builds the HTTP request line.
2100 * If a HTTP forwarder is used it expects the whole URL,
2101 * web servers only get the path.
2104 * 1 : csp = Current client state (buffers, headers, etc...)
2105 * 2 : fwd = The forwarding spec used for the request
2106 * XXX: Should use http->fwd instead.
2107 * 3 : request_line = The old request line which will be replaced.
2109 * Returns : Nothing. Terminates in case of memory problems.
2111 *********************************************************************/
2112 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
2114 struct http_request *http = csp->http;
2116 assert(http->ssl == 0);
2119 * Downgrade http version from 1.1 to 1.0
2120 * if +downgrade action applies.
2122 if ( (csp->action->flags & ACTION_DOWNGRADE)
2123 && (!strcmpic(http->ver, "HTTP/1.1")))
2126 http->ver = strdup("HTTP/1.0");
2128 if (http->ver == NULL)
2130 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
2135 * Rebuild the request line.
2137 freez(*request_line);
2138 *request_line = strdup(http->gpc);
2139 string_append(request_line, " ");
2141 if (fwd->forward_host)
2143 string_append(request_line, http->url);
2147 string_append(request_line, http->path);
2149 string_append(request_line, " ");
2150 string_append(request_line, http->ver);
2152 if (*request_line == NULL)
2154 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
2156 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
2160 /*********************************************************************
2162 * Function : change_request_destination
2164 * Description : Parse a (rewritten) request line and regenerate
2165 * the http request data.
2168 * 1 : csp = Current client state (buffers, headers, etc...)
2170 * Returns : Forwards the parse_http_request() return code.
2171 * Terminates in case of memory problems.
2173 *********************************************************************/
2174 static jb_err change_request_destination(struct client_state *csp)
2176 struct http_request *http = csp->http;
2179 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
2180 free_http_request(http);
2181 err = parse_http_request(csp->headers->first->str, http);
2182 if (JB_ERR_OK != err)
2184 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2185 jb_err_to_string(err));
2189 /* XXX: ocmd is a misleading name */
2190 http->ocmd = strdup(http->cmd);
2191 if (http->ocmd == NULL)
2193 log_error(LOG_LEVEL_FATAL,
2194 "Out of memory copying rewritten HTTP request line");
2202 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2203 /*********************************************************************
2205 * Function : server_response_is_complete
2207 * Description : Determines whether we should stop reading
2208 * from the server socket.
2211 * 1 : csp = Current client state (buffers, headers, etc...)
2212 * 2 : content_length = Length of content received so far.
2214 * Returns : TRUE if the response is complete,
2217 *********************************************************************/
2218 static int server_response_is_complete(struct client_state *csp,
2219 unsigned long long content_length)
2221 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
2223 if (!strcmpic(csp->http->gpc, "HEAD"))
2226 * "HEAD" implies no body, we are thus expecting
2227 * no content. XXX: incomplete "list" of methods?
2229 csp->expected_content_length = 0;
2230 content_length_known = TRUE;
2233 if (csp->http->status == 304)
2236 * Expect no body. XXX: incomplete "list" of status codes?
2238 csp->expected_content_length = 0;
2239 content_length_known = TRUE;
2242 return (content_length_known && ((0 == csp->expected_content_length)
2243 || (csp->expected_content_length <= content_length)));
2247 /*********************************************************************
2249 * Function : wait_for_alive_connections
2251 * Description : Waits for alive connections to timeout.
2257 *********************************************************************/
2258 static void wait_for_alive_connections()
2260 int connections_alive = close_unusable_connections();
2262 while (0 < connections_alive)
2264 log_error(LOG_LEVEL_CONNECT,
2265 "Waiting for %d connections to timeout.",
2268 connections_alive = close_unusable_connections();
2271 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
2274 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2277 /*********************************************************************
2279 * Function : mark_server_socket_tainted
2281 * Description : Makes sure we don't reuse a server socket
2282 * (if we didn't read everything the server sent
2283 * us reusing the socket would lead to garbage).
2286 * 1 : csp = Current client state (buffers, headers, etc...)
2290 *********************************************************************/
2291 static void mark_server_socket_tainted(struct client_state *csp)
2293 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
2295 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
2296 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
2300 /*********************************************************************
2302 * Function : get_request_line
2304 * Description : Read the client request line.
2307 * 1 : csp = Current client state (buffers, headers, etc...)
2309 * Returns : Pointer to request line or NULL in case of errors.
2311 *********************************************************************/
2312 static char *get_request_line(struct client_state *csp)
2314 char buf[BUFFER_SIZE];
2315 char *request_line = NULL;
2318 memset(buf, 0, sizeof(buf));
2322 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2324 log_error(LOG_LEVEL_ERROR,
2325 "Stopped waiting for the request line.");
2326 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2327 strlen(CONNECTION_TIMEOUT_RESPONSE));
2331 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2333 if (len <= 0) return NULL;
2336 * If there is no memory left for buffering the
2337 * request, there is nothing we can do but hang up
2339 if (add_to_iob(csp, buf, len))
2344 request_line = get_header(csp->iob);
2346 } while ((NULL != request_line) && ('\0' == *request_line));
2348 return request_line;
2353 /*********************************************************************
2355 * Function : receive_client_request
2357 * Description : Read the client's request (more precisely the
2358 * client headers) and answer it if necessary.
2360 * Note that since we're not using select() we could get
2361 * blocked here if a client connected, then didn't say
2365 * 1 : csp = Current client state (buffers, headers, etc...)
2367 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
2369 *********************************************************************/
2370 static jb_err receive_client_request(struct client_state *csp)
2372 char buf[BUFFER_SIZE];
2375 struct http_request *http;
2379 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
2380 struct list header_list;
2381 struct list *headers = &header_list;
2385 memset(buf, 0, sizeof(buf));
2387 req = get_request_line(csp);
2390 return JB_ERR_PARSE;
2392 assert(*req != '\0');
2394 if (client_protocol_is_unsupported(csp, req))
2396 return JB_ERR_PARSE;
2399 #ifdef FEATURE_FORCE_LOAD
2401 * If this request contains the FORCE_PREFIX and blocks
2402 * aren't enforced, get rid of it and set the force flag.
2404 if (strstr(req, FORCE_PREFIX))
2406 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
2408 log_error(LOG_LEVEL_FORCE,
2409 "Ignored force prefix in request: \"%s\".", req);
2413 strclean(req, FORCE_PREFIX);
2414 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
2415 csp->flags |= CSP_FLAG_FORCED;
2418 #endif /* def FEATURE_FORCE_LOAD */
2420 err = parse_http_request(req, http);
2422 if (JB_ERR_OK != err)
2424 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
2425 /* XXX: Use correct size */
2426 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2427 log_error(LOG_LEVEL_ERROR,
2428 "Couldn't parse request line received from %s: %s",
2429 csp->ip_addr_str, jb_err_to_string(err));
2431 free_http_request(http);
2432 return JB_ERR_PARSE;
2435 /* grab the rest of the client's headers */
2439 p = get_header(csp->iob);
2443 /* There are no additional headers to read. */
2450 * We didn't receive a complete header
2451 * line yet, get the rest of it.
2453 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
2455 log_error(LOG_LEVEL_ERROR,
2456 "Stopped grabbing the client headers.");
2457 return JB_ERR_PARSE;
2460 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2463 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
2464 destroy_list(headers);
2465 return JB_ERR_PARSE;
2468 if (add_to_iob(csp, buf, len))
2471 * If there is no memory left for buffering the
2472 * request, there is nothing we can do but hang up
2474 destroy_list(headers);
2475 return JB_ERR_MEMORY;
2481 * We were able to read a complete
2482 * header and can finaly enlist it.
2489 if (http->host == NULL)
2492 * If we still don't know the request destination,
2493 * the request is invalid or the client uses
2494 * Privoxy without its knowledge.
2496 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
2499 * Our attempts to get the request destination
2500 * elsewhere failed or Privoxy is configured
2501 * to only accept proxy requests.
2503 * An error response has already been send
2504 * and we're done here.
2506 return JB_ERR_PARSE;
2511 * Determine the actions for this URL
2513 #ifdef FEATURE_TOGGLE
2514 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2516 /* Most compatible set of actions (i.e. none) */
2517 init_current_action(csp->action);
2520 #endif /* ndef FEATURE_TOGGLE */
2522 get_url_actions(csp, http);
2526 * Save a copy of the original request for logging
2528 http->ocmd = strdup(http->cmd);
2529 if (http->ocmd == NULL)
2531 log_error(LOG_LEVEL_FATAL,
2532 "Out of memory copying HTTP request line");
2534 enlist(csp->headers, http->cmd);
2536 /* Append the previously read headers */
2537 list_append_list_unique(csp->headers, headers);
2538 destroy_list(headers);
2545 /*********************************************************************
2547 * Function : parse_client_request
2549 * Description : Parses the client's request and decides what to do
2552 * Note that since we're not using select() we could get
2553 * blocked here if a client connected, then didn't say
2557 * 1 : csp = Current client state (buffers, headers, etc...)
2559 * Returns : JB_ERR_OK or JB_ERR_PARSE
2561 *********************************************************************/
2562 static jb_err parse_client_request(struct client_state *csp)
2564 struct http_request *http = csp->http;
2567 err = sed(csp, FILTER_CLIENT_HEADERS);
2568 if (JB_ERR_OK != err)
2570 /* XXX: Should be handled in sed(). */
2571 assert(err == JB_ERR_PARSE);
2572 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
2574 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2576 /* Check request line for rewrites. */
2577 if ((NULL == csp->headers->first->str)
2578 || (strcmp(http->cmd, csp->headers->first->str) &&
2579 (JB_ERR_OK != change_request_destination(csp))))
2582 * A header filter broke the request line - bail out.
2584 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
2585 /* XXX: Use correct size */
2586 log_error(LOG_LEVEL_CLF,
2587 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
2588 log_error(LOG_LEVEL_ERROR,
2589 "Invalid request line after applying header filters.");
2590 free_http_request(http);
2592 return JB_ERR_PARSE;
2600 /*********************************************************************
2604 * Description : Once a connection to the client has been accepted,
2605 * this function is called (via serve()) to handle the
2606 * main business of the communication. When this
2607 * function returns, the caller must close the client
2610 * FIXME: chat is nearly thousand lines long.
2614 * 1 : csp = Current client state (buffers, headers, etc...)
2616 * Returns : Nothing.
2618 *********************************************************************/
2619 static void chat(struct client_state *csp)
2621 char buf[BUFFER_SIZE];
2628 int ms_iis5_hack = 0;
2629 unsigned long long byte_count = 0;
2630 int forwarded_connect_retries = 0;
2631 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
2632 const struct forward_spec *fwd;
2633 struct http_request *http;
2634 long len = 0; /* for buffer sizes (and negative error codes) */
2636 /* Function that does the content filtering for the current request */
2637 filter_function_ptr content_filter = NULL;
2639 /* Skeleton for HTTP response, if we should intercept the request */
2640 struct http_response *rsp;
2641 struct timeval timeout;
2643 memset(buf, 0, sizeof(buf));
2647 if (receive_client_request(csp) != JB_ERR_OK)
2651 if (parse_client_request(csp) != JB_ERR_OK)
2656 /* decide how to route the HTTP request */
2657 fwd = forward_url(csp, http);
2660 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
2661 /* Never get here - LOG_LEVEL_FATAL causes program exit */
2666 * build the http request to send to the server
2667 * we have to do one of the following:
2669 * create = use the original HTTP request to create a new
2670 * HTTP request that has either the path component
2671 * without the http://domainspec (w/path) or the
2672 * full orininal URL (w/url)
2673 * Note that the path and/or the HTTP version may
2674 * have been altered by now.
2676 * connect = Open a socket to the host:port of the server
2677 * and short-circuit server and client socket.
2679 * pass = Pass the request unchanged if forwarding a CONNECT
2680 * request to a parent proxy. Note that we'll be sending
2681 * the CFAIL message ourselves if connecting to the parent
2682 * fails, but we won't send a CSUCCEED message if it works,
2683 * since that would result in a double message (ours and the
2684 * parent's). After sending the request to the parent, we simply
2687 * here's the matrix:
2690 * +--------+--------+
2692 * 0 | create | connect|
2694 * Forwarding +--------+--------+
2696 * 1 | create | pass |
2698 * +--------+--------+
2702 if (http->ssl && connect_port_is_forbidden(csp))
2704 const char *acceptable_connect_ports =
2705 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
2706 assert(NULL != acceptable_connect_ports);
2707 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
2708 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
2709 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
2710 csp->action->flags |= ACTION_BLOCK;
2716 freez(csp->headers->first->str);
2717 build_request_line(csp, fwd, &csp->headers->first->str);
2721 * We have a request. Check if one of the crunchers wants it.
2723 if (crunch_response_triggered(csp, crunchers_all))
2726 * Yes. The client got the crunch response
2727 * and we are done here after cleaning up.
2729 /* XXX: why list_remove_all()? */
2730 list_remove_all(csp->headers);
2735 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
2737 if (fwd->forward_host)
2739 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
2740 fwd->forward_host, fwd->forward_port, http->hostport);
2744 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
2747 /* here we connect to the server, gateway, or the forwarder */
2749 while ((csp->sfd = forwarded_connect(fwd, http, csp))
2750 && (errno == EINVAL)
2751 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
2753 log_error(LOG_LEVEL_ERROR,
2754 "failed request #%u to connect to %s. Trying again.",
2755 forwarded_connect_retries, http->hostport);
2758 if (csp->sfd == JB_INVALID_SOCKET)
2760 if (fwd->type != SOCKS_NONE)
2763 rsp = error_response(csp, "forwarding-failed", errno);
2765 else if (errno == EINVAL)
2767 rsp = error_response(csp, "no-such-domain", errno);
2771 rsp = error_response(csp, "connect-failed", errno);
2772 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
2776 /* Write the answer to the client */
2779 send_crunch_response(csp, rsp);
2785 hdr = list_to_text(csp->headers);
2788 /* FIXME Should handle error properly */
2789 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2791 list_remove_all(csp->headers);
2793 if (fwd->forward_host || (http->ssl == 0))
2796 * Write the client's (modified) header to the server
2797 * (along with anything else that may be in the buffer)
2799 if (write_socket(csp->sfd, hdr, strlen(hdr))
2800 || (flush_socket(csp->sfd, csp->iob) < 0))
2802 log_error(LOG_LEVEL_CONNECT,
2803 "write header to: %s failed: %E", http->hostport);
2805 rsp = error_response(csp, "connect-failed", errno);
2808 send_crunch_response(csp, rsp);
2818 * We're running an SSL tunnel and we're not forwarding,
2819 * so just send the "connect succeeded" message to the
2820 * client, flush the rest, and get out of the way.
2822 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
2830 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
2832 /* we're finished with the client's header */
2835 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
2837 /* pass data between the client and server
2838 * until one or the other shuts down the connection.
2847 * FD_ZERO here seems to point to an errant macro which crashes.
2848 * So do this by hand for now...
2850 memset(&rfds,0x00,sizeof(fd_set));
2854 FD_SET(csp->cfd, &rfds);
2855 FD_SET(csp->sfd, &rfds);
2857 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2858 if ((csp->flags & CSP_FLAG_CHUNKED)
2859 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2860 && ((csp->iob->eod - csp->iob->cur) >= 5)
2861 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2863 log_error(LOG_LEVEL_CONNECT,
2864 "Looks like we read the last chunk together with "
2865 "the server headers. We better stop reading.");
2866 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2867 csp->expected_content_length = byte_count;
2868 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2870 if (server_body && server_response_is_complete(csp, byte_count))
2872 log_error(LOG_LEVEL_CONNECT,
2873 "Done reading from server. Expected content length: %llu. "
2874 "Actual content length: %llu. Most recently received: %d.",
2875 csp->expected_content_length, byte_count, len);
2878 * XXX: should not jump around,
2879 * chat() is complicated enough already.
2883 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2885 timeout.tv_sec = csp->config->socket_timeout;
2886 timeout.tv_usec = 0;
2887 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
2891 log_error(LOG_LEVEL_ERROR,
2892 "Didn't receive data in time: %s", http->url);
2893 if ((byte_count == 0) && (http->ssl == 0))
2895 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
2896 strlen(CONNECTION_TIMEOUT_RESPONSE));
2898 mark_server_socket_tainted(csp);
2903 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2904 mark_server_socket_tainted(csp);
2909 * This is the body of the browser's request,
2910 * just read and write it.
2912 if (FD_ISSET(csp->cfd, &rfds))
2914 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
2918 /* XXX: not sure if this is necessary. */
2919 mark_server_socket_tainted(csp);
2920 break; /* "game over, man" */
2923 if (write_socket(csp->sfd, buf, (size_t)len))
2925 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2926 mark_server_socket_tainted(csp);
2933 * The server wants to talk. It could be the header or the body.
2934 * If `hdr' is null, then it's the header otherwise it's the body.
2935 * FIXME: Does `hdr' really mean `host'? No.
2937 if (FD_ISSET(csp->sfd, &rfds))
2940 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
2944 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2946 if (http->ssl && (fwd->forward_host == NULL))
2949 * Just hang up. We already confirmed the client's CONNECT
2950 * request with status code 200 and unencrypted content is
2951 * no longer welcome.
2953 log_error(LOG_LEVEL_ERROR,
2954 "CONNECT already confirmed. Unable to tell the client about the problem.");
2957 else if (byte_count)
2960 * Just hang up. We already transmitted the original headers
2961 * and parts of the original content and therefore missed the
2962 * chance to send an error message (without risking data corruption).
2964 * XXX: we could retry with a fancy range request here.
2966 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2967 "Unable to tell the client about the problem.");
2968 mark_server_socket_tainted(csp);
2972 * XXX: Consider handling the cases above the same.
2974 mark_server_socket_tainted(csp);
2978 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2979 if (csp->flags & CSP_FLAG_CHUNKED)
2981 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
2983 /* XXX: this is a temporary hack */
2984 log_error(LOG_LEVEL_CONNECT,
2985 "Looks like we reached the end of the last chunk. "
2986 "We better stop reading.");
2987 csp->expected_content_length = byte_count + (unsigned long long)len;
2988 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2992 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2995 * Add a trailing zero to let be able to use string operations.
2996 * XXX: do we still need this with filter_popups gone?
3001 * Normally, this would indicate that we've read
3002 * as much as the server has sent us and we can
3003 * close the client connection. However, Microsoft
3004 * in its wisdom has released IIS/5 with a bug that
3005 * prevents it from sending the trailing \r\n in
3006 * a 302 redirect header (and possibly other headers).
3007 * To work around this if we've haven't parsed
3008 * a full header we'll append a trailing \r\n
3009 * and see if this now generates a valid one.
3011 * This hack shouldn't have any impacts. If we've
3012 * already transmitted the header or if this is a
3013 * SSL connection, then we won't bother with this
3014 * hack. So we only work on partially received
3015 * headers. If we append a \r\n and this still
3016 * doesn't generate a valid header, then we won't
3017 * transmit anything to the client.
3022 if (server_body || http->ssl)
3025 * If we have been buffering up the document,
3026 * now is the time to apply content modification
3027 * and send the result to the client.
3031 p = execute_content_filter(csp, content_filter);
3033 * If the content filter fails, use the original
3034 * buffer and length.
3035 * (see p != NULL ? p : csp->iob->cur below)
3039 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3042 if (JB_ERR_OK != update_server_headers(csp))
3044 log_error(LOG_LEVEL_FATAL,
3045 "Failed to update server headers. after filtering.");
3048 hdr = list_to_text(csp->headers);
3051 /* FIXME Should handle error properly */
3052 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3055 if (write_socket(csp->cfd, hdr, strlen(hdr))
3056 || write_socket(csp->cfd,
3057 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
3059 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3062 mark_server_socket_tainted(csp);
3070 break; /* "game over, man" */
3074 * This is NOT the body, so
3075 * Let's pretend the server just sent us a blank line.
3077 snprintf(buf, sizeof(buf), "\r\n");
3078 len = (int)strlen(buf);
3081 * Now, let the normal header parsing algorithm below do its
3082 * job. If it fails, we'll exit instead of continuing.
3089 * If this is an SSL connection or we're in the body
3090 * of the server document, just write it to the client,
3091 * unless we need to buffer the body for later content-filtering
3093 if (server_body || http->ssl)
3098 * If there is no memory left for buffering the content, or the buffer limit
3099 * has been reached, switch to non-filtering mode, i.e. make & write the
3100 * header, flush the iob and buf, and get out of the way.
3102 if (add_to_iob(csp, buf, len))
3107 log_error(LOG_LEVEL_INFO,
3108 "Flushing header and buffers. Stepping back from filtering.");
3110 hdr = list_to_text(csp->headers);
3114 * Memory is too tight to even generate the header.
3115 * Send our static "Out-of-memory" page.
3117 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3118 rsp = cgi_error_memory();
3119 send_crunch_response(csp, rsp);
3120 mark_server_socket_tainted(csp);
3123 hdrlen = strlen(hdr);
3125 if (write_socket(csp->cfd, hdr, hdrlen)
3126 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
3127 || (write_socket(csp->cfd, buf, (size_t)len)))
3129 log_error(LOG_LEVEL_CONNECT,
3130 "Flush header and buffers to client failed: %E");
3132 mark_server_socket_tainted(csp);
3137 * Reset the byte_count to the amount of bytes
3138 * we just flushed. len will be added a few lines below,
3139 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3141 byte_count = (unsigned long long)flushed;
3143 content_filter = NULL;
3149 if (write_socket(csp->cfd, buf, (size_t)len))
3151 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3152 mark_server_socket_tainted(csp);
3156 byte_count += (unsigned long long)len;
3161 const char *header_start;
3163 * We're still looking for the end of the server's header.
3164 * Buffer up the data we just read. If that fails, there's
3165 * little we can do but send our static out-of-memory page.
3167 if (add_to_iob(csp, buf, len))
3169 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3170 rsp = cgi_error_memory();
3171 send_crunch_response(csp, rsp);
3172 mark_server_socket_tainted(csp);
3176 header_start = csp->iob->cur;
3178 /* Convert iob into something sed() can digest */
3179 if (JB_ERR_PARSE == get_server_headers(csp))
3184 * Well, we tried our MS IIS/5 hack and it didn't work.
3185 * The header is incomplete and there isn't anything
3186 * we can do about it.
3188 log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3189 "Applying the MS IIS5 hack didn't help.");
3190 log_error(LOG_LEVEL_CLF,
3191 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3192 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3193 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3194 mark_server_socket_tainted(csp);
3200 * Since we have to wait for more from the server before
3201 * we can parse the headers we just continue here.
3203 long header_offset = csp->iob->cur - header_start;
3204 assert(csp->iob->cur >= header_start);
3205 byte_count += (unsigned long long)(len - header_offset);
3206 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
3207 "byte_count: %llu. header_offset: %d. len: %d.",
3208 byte_count, header_offset, len);
3213 /* Did we actually get anything? */
3214 if (NULL == csp->headers->first)
3216 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
3217 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3218 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
3219 free_http_request(http);
3220 mark_server_socket_tainted(csp);
3224 assert(csp->headers->first->str);
3226 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3227 strncmpic(csp->headers->first->str, "ICY", 3))
3230 * It doesn't look like a HTTP (or Shoutcast) response:
3231 * tell the client and log the problem.
3233 if (strlen(csp->headers->first->str) > 30)
3235 csp->headers->first->str[30] = '\0';
3237 log_error(LOG_LEVEL_ERROR,
3238 "Invalid server or forwarder response. Starts with: %s",
3239 csp->headers->first->str);
3240 log_error(LOG_LEVEL_CLF,
3241 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3242 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3243 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3244 free_http_request(http);
3245 mark_server_socket_tainted(csp);
3250 * We have now received the entire server header,
3251 * filter it and send the result to the client
3253 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3255 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
3257 hdr = list_to_text(csp->headers);
3260 /* FIXME Should handle error properly */
3261 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3264 if (crunch_response_triggered(csp, crunchers_light))
3267 * One of the tags created by a server-header
3268 * tagger triggered a crunch. We already
3269 * delivered the crunch response to the client
3270 * and are done here after cleaning up.
3273 mark_server_socket_tainted(csp);
3276 /* Buffer and pcrs filter this if appropriate. */
3278 if (!http->ssl) /* We talk plaintext */
3280 content_filter = get_filter_function(csp);
3283 * Only write if we're not buffering for content modification
3285 if (!content_filter)
3288 * Write the server's (modified) header to
3289 * the client (along with anything else that
3290 * may be in the buffer)
3293 if (write_socket(csp->cfd, hdr, strlen(hdr))
3294 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
3296 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
3299 * The write failed, so don't bother mentioning it
3300 * to the client... it probably can't hear us anyway.
3303 mark_server_socket_tainted(csp);
3307 byte_count += (unsigned long long)len;
3312 * XXX: the header lenght should probably
3313 * be calculated by get_server_headers().
3315 long header_length = csp->iob->cur - header_start;
3316 assert(csp->iob->cur > header_start);
3317 byte_count += (unsigned long long)(len - header_length);
3320 /* we're finished with the server's header */
3326 * If this was a MS IIS/5 hack then it means the server
3327 * has already closed the connection. Nothing more to read.
3332 log_error(LOG_LEVEL_ERROR,
3333 "Closed server connection detected. "
3334 "Applying the MS IIS5 hack didn't help.");
3335 log_error(LOG_LEVEL_CLF,
3336 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3337 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3338 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3339 mark_server_socket_tainted(csp);
3345 mark_server_socket_tainted(csp);
3346 return; /* huh? we should never get here */
3349 if (csp->content_length == 0)
3352 * If Privoxy didn't recalculate the Content-Lenght,
3353 * byte_count is still correct.
3355 csp->content_length = byte_count;
3358 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3359 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3360 && (csp->expected_content_length != byte_count))
3362 log_error(LOG_LEVEL_CONNECT,
3363 "Received %llu bytes while expecting %llu.",
3364 byte_count, csp->expected_content_length);
3365 mark_server_socket_tainted(csp);
3369 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3370 csp->ip_addr_str, http->ocmd, csp->content_length);
3374 /*********************************************************************
3378 * Description : This is little more than chat. We only "serve" to
3379 * to close (or remember) any socket that chat may have
3383 * 1 : csp = Current client state (buffers, headers, etc...)
3387 *********************************************************************/
3389 void serve(struct client_state *csp)
3390 #else /* ifndef AMIGA */
3391 static void serve(struct client_state *csp)
3392 #endif /* def AMIGA */
3396 if (csp->sfd != JB_INVALID_SOCKET)
3398 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3399 static int monitor_thread_running = 0;
3401 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
3402 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
3404 remember_connection(csp->sfd, csp->http, forward_url(csp, csp->http));
3405 close_socket(csp->cfd);
3406 csp->cfd = JB_INVALID_SOCKET;
3407 privoxy_mutex_lock(&connection_reuse_mutex);
3408 if (!monitor_thread_running)
3410 monitor_thread_running = 1;
3411 privoxy_mutex_unlock(&connection_reuse_mutex);
3412 wait_for_alive_connections();
3413 privoxy_mutex_lock(&connection_reuse_mutex);
3414 monitor_thread_running = 0;
3416 privoxy_mutex_unlock(&connection_reuse_mutex);
3420 forget_connection(csp->sfd);
3421 close_socket(csp->sfd);
3424 close_socket(csp->sfd);
3425 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3428 if (csp->cfd != JB_INVALID_SOCKET)
3430 close_socket(csp->cfd);
3433 csp->flags &= ~CSP_FLAG_ACTIVE;
3439 /*********************************************************************
3441 * Function : server_thread
3443 * Description : We only exist to call `serve' in a threaded environment.
3446 * 1 : data = Current client state (buffers, headers, etc...)
3448 * Returns : Always 0.
3450 *********************************************************************/
3451 static int32 server_thread(void *data)
3453 serve((struct client_state *) data);
3460 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3461 /*********************************************************************
3465 * Description : Print usage info & exit.
3467 * Parameters : Pointer to argv[0] for identifying ourselves
3471 *********************************************************************/
3472 static void usage(const char *myname)
3474 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
3478 #endif /* defined(unix) */
3481 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
3482 #endif /* defined(unix) */
3483 "[--version] [configfile]\n"
3484 "Aborting\n", myname);
3489 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
3492 #ifdef MUTEX_LOCKS_AVAILABLE
3493 /*********************************************************************
3495 * Function : privoxy_mutex_lock
3497 * Description : Locks a mutex.
3500 * 1 : mutex = The mutex to lock.
3502 * Returns : Void. May exit in case of errors.
3504 *********************************************************************/
3505 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
3507 #ifdef FEATURE_PTHREAD
3508 int err = pthread_mutex_lock(mutex);
3511 if (mutex != &log_mutex)
3513 log_error(LOG_LEVEL_FATAL,
3514 "Mutex locking failed: %s.\n", strerror(err));
3519 EnterCriticalSection(mutex);
3520 #endif /* def FEATURE_PTHREAD */
3524 /*********************************************************************
3526 * Function : privoxy_mutex_unlock
3528 * Description : Unlocks a mutex.
3531 * 1 : mutex = The mutex to unlock.
3533 * Returns : Void. May exit in case of errors.
3535 *********************************************************************/
3536 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
3538 #ifdef FEATURE_PTHREAD
3539 int err = pthread_mutex_unlock(mutex);
3542 if (mutex != &log_mutex)
3544 log_error(LOG_LEVEL_FATAL,
3545 "Mutex unlocking failed: %s.\n", strerror(err));
3550 LeaveCriticalSection(mutex);
3551 #endif /* def FEATURE_PTHREAD */
3555 /*********************************************************************
3557 * Function : privoxy_mutex_init
3559 * Description : Prepares a mutex.
3562 * 1 : mutex = The mutex to initialize.
3564 * Returns : Void. May exit in case of errors.
3566 *********************************************************************/
3567 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
3569 #ifdef FEATURE_PTHREAD
3570 int err = pthread_mutex_init(mutex, 0);
3573 printf("Fatal error. Mutex initialization failed: %s.\n",
3578 InitializeCriticalSection(mutex);
3579 #endif /* def FEATURE_PTHREAD */
3581 #endif /* def MUTEX_LOCKS_AVAILABLE */
3583 /*********************************************************************
3585 * Function : initialize_mutexes
3587 * Description : Prepares mutexes if mutex support is available.
3591 * Returns : Void, exits in case of errors.
3593 *********************************************************************/
3594 static void initialize_mutexes(void)
3596 #ifdef MUTEX_LOCKS_AVAILABLE
3598 * Prepare global mutex semaphores
3600 privoxy_mutex_init(&log_mutex);
3601 privoxy_mutex_init(&log_init_mutex);
3602 privoxy_mutex_init(&connection_reuse_mutex);
3605 * XXX: The assumptions below are a bit naive
3606 * and can cause locks that aren't necessary.
3608 * For example older FreeBSD versions (< 6.x?)
3609 * have no gethostbyname_r, but gethostbyname is
3612 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
3613 privoxy_mutex_init(&resolver_mutex);
3614 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
3616 * XXX: should we use a single mutex for
3617 * localtime() and gmtime() as well?
3619 #ifndef HAVE_GMTIME_R
3620 privoxy_mutex_init(&gmtime_mutex);
3621 #endif /* ndef HAVE_GMTIME_R */
3623 #ifndef HAVE_LOCALTIME_R
3624 privoxy_mutex_init(&localtime_mutex);
3625 #endif /* ndef HAVE_GMTIME_R */
3628 privoxy_mutex_init(&rand_mutex);
3629 #endif /* ndef HAVE_RANDOM */
3630 #endif /* def MUTEX_LOCKS_AVAILABLE */
3634 /*********************************************************************
3638 * Description : Load the config file and start the listen loop.
3639 * This function is a lot more *sane* with the `load_config'
3640 * and `listen_loop' functions; although it stills does
3641 * a *little* too much for my taste.
3644 * 1 : argc = Number of parameters (including $0).
3645 * 2 : argv = Array of (char *)'s to the parameters.
3647 * Returns : 1 if : can't open config file, unrecognized directive,
3648 * stats requested in multi-thread mode, can't open the
3649 * log file, can't open the jar file, listen port is invalid,
3650 * any load fails, and can't bind port.
3652 * Else main never returns, the process must be signaled
3653 * to terminate execution. Or, on Windows, use the
3654 * "File", "Exit" menu option.
3656 *********************************************************************/
3658 int real_main(int argc, const char *argv[])
3660 int main(int argc, const char *argv[])
3664 unsigned int random_seed;
3666 struct passwd *pw = NULL;
3667 struct group *grp = NULL;
3670 char *pre_chroot_nslookup_to_load_resolver = NULL;
3677 #if !defined(_WIN32)
3684 /* Prepare mutexes if supported and necessary. */
3685 initialize_mutexes();
3687 /* Enable logging until further notice. */
3691 * Parse the command line arguments
3693 * XXX: simply printing usage information in case of
3694 * invalid arguments isn't particularly user friendly.
3696 while (++argc_pos < argc)
3699 /* Check to see if the service must be installed or uninstalled */
3700 if (strncmp(argv[argc_pos], "--install", 9) == 0)
3702 const char *pName = argv[argc_pos] + 9;
3705 exit( (install_service(pName)) ? 0 : 1 );
3707 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
3709 const char *pName = argv[argc_pos] + 11;
3712 exit((uninstall_service(pName)) ? 0 : 1);
3714 else if (strcmp(argv[argc_pos], "--service" ) == 0)
3716 bRunAsService = TRUE;
3717 w32_set_service_cwd();
3718 atexit(w32_service_exit_notify);
3721 #endif /* defined(_WIN32) */
3724 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
3726 if (strcmp(argv[argc_pos], "--help") == 0)
3731 else if(strcmp(argv[argc_pos], "--version") == 0)
3733 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
3739 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
3741 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
3745 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
3747 if (++argc_pos == argc) usage(argv[0]);
3748 pidfile = strdup(argv[argc_pos]);
3751 else if (strcmp(argv[argc_pos], "--user" ) == 0)
3753 if (++argc_pos == argc) usage(argv[argc_pos]);
3755 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
3758 if (NULL == (grp = getgrnam(p)))
3760 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
3764 if (NULL == (pw = getpwnam(argv[argc_pos])))
3766 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
3769 if (p != NULL) *--p = '\0';
3772 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
3774 if (++argc_pos == argc) usage(argv[0]);
3775 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
3778 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
3782 #endif /* defined(unix) */
3784 else if (argc_pos + 1 != argc)
3787 * This is neither the last command line
3788 * option, nor was it recognized before,
3789 * therefore it must be invalid.
3795 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
3797 configfile = argv[argc_pos];
3800 } /* -END- while (more arguments) */
3802 show_version(Argv[0]);
3805 if ( *configfile != '/' )
3807 char cwd[BUFFER_SIZE];
3809 size_t abs_file_size;
3811 /* make config-filename absolute here */
3812 if (NULL == getcwd(cwd, sizeof(cwd)))
3814 perror("failed to get current working directory");
3819 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
3820 basedir = strdup(cwd);
3822 if (NULL == basedir ||
3823 NULL == (abs_file = malloc(abs_file_size)))
3825 perror("malloc failed");
3828 strlcpy(abs_file, basedir, abs_file_size);
3829 strlcat(abs_file, "/", abs_file_size );
3830 strlcat(abs_file, configfile, abs_file_size);
3831 configfile = abs_file;
3833 #endif /* defined unix */
3837 clients->next = NULL;
3839 /* XXX: factor out initialising after the next stable release. */
3842 #elif defined(_WIN32)
3846 random_seed = (unsigned int)time(NULL);
3848 srandom(random_seed);
3851 #endif /* ifdef HAVE_RANDOM */
3854 * Unix signal handling
3856 * Catch the abort, interrupt and terminate signals for a graceful exit
3857 * Catch the hangup signal so the errlog can be reopened.
3858 * Ignore the broken pipe signals (FIXME: Why?)
3860 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
3863 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
3864 const int ignored_signals[] = { SIGPIPE, 0 };
3866 for (idx = 0; catched_signals[idx] != 0; idx++)
3868 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
3869 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
3871 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
3872 #endif /* ifdef sun */
3874 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
3878 for (idx = 0; ignored_signals[idx] != 0; idx++)
3880 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
3882 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
3887 #else /* ifdef _WIN32 */
3888 # ifdef _WIN_CONSOLE
3890 * We *are* in a windows console app.
3891 * Print a verbose messages about FAQ's and such
3893 printf("%s", win32_blurb);
3894 # endif /* def _WIN_CONSOLE */
3895 #endif /* def _WIN32 */
3898 /* Initialize the CGI subsystem */
3899 cgi_init_error_messages();
3902 * If runnig on unix and without the --nodaemon
3903 * option, become a daemon. I.e. fork, detach
3904 * from tty and get process group leadership
3917 if ( pid < 0 ) /* error */
3922 else if ( pid != 0 ) /* parent */
3927 * must check for errors
3928 * child died due to missing files aso
3931 wpid = waitpid( pid, &status, WNOHANG );
3940 /* Should be more portable, but not as well tested */
3945 #else /* ndef __FreeBSD__ */
3947 #endif /* ndef __FreeBSD__ */
3948 fd = open("/dev/tty", O_RDONLY);
3951 /* no error check here */
3952 ioctl( fd, TIOCNOTTY,0 );
3957 * stderr (fd 2) will be closed later on,
3958 * when the config file has been parsed.
3965 } /* -END- if (!no_daemon) */
3968 * As soon as we have written the PID file, we can switch
3969 * to the user and group ID indicated by the --user option
3975 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3977 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3981 if (setgroups(1, &grp->gr_gid))
3983 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
3986 else if (initgroups(pw->pw_name, pw->pw_gid))
3988 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
3994 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3996 /* Read the time zone file from /etc before doing chroot. */
3998 if (NULL != pre_chroot_nslookup_to_load_resolver
3999 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
4001 /* Initialize resolver library. */
4002 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
4004 if (chroot(pw->pw_dir) < 0)
4006 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
4010 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
4013 if (setuid(pw->pw_uid))
4015 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
4019 char putenv_dummy[64];
4021 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
4022 if (putenv(putenv_dummy) != 0)
4024 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
4027 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
4028 if (putenv(putenv_dummy) != 0)
4030 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
4036 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
4039 #endif /* defined unix */
4042 /* This will be FALSE unless the command line specified --service
4046 /* Yup, so now we must attempt to establish a connection
4047 * with the service dispatcher. This will only work if this
4048 * process was launched by the service control manager to
4049 * actually run as a service. If this isn't the case, i've
4050 * known it take around 30 seconds or so for the call to return.
4053 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
4054 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
4056 /* Service has run, and at this point is now being stopped, so just return */
4061 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
4063 /* An error occurred. Usually it's because --service was wrongly specified
4064 * and we were unable to connect to the Service Control Dispatcher because
4065 * it wasn't expecting us and is therefore not listening.
4067 * For now, just continue below to call the listen_loop function.
4070 #endif /* def _WIN32 */
4080 /*********************************************************************
4082 * Function : bind_port_helper
4084 * Description : Bind the listen port. Handles logging, and aborts
4088 * 1 : config = Privoxy configuration. Specifies port
4091 * Returns : Port that was opened.
4093 *********************************************************************/
4094 static jb_socket bind_port_helper(struct configuration_spec * config)
4099 if (config->haddr == NULL)
4101 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
4106 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
4107 config->hport, config->haddr);
4110 result = bind_port(config->haddr, config->hport, &bfd);
4117 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4118 "There may be another Privoxy or some other "
4119 "proxy running on port %d",
4120 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
4121 config->hport, config->hport);
4124 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
4125 "The hostname is not resolvable",
4126 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4129 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
4130 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
4133 /* shouldn't get here */
4134 return JB_INVALID_SOCKET;
4137 config->need_bind = 0;
4144 /* Without this simple workaround we get this compiler warning from _beginthread
4145 * warning C4028: formal parameter 1 different from declaration
4147 void w32_service_listen_loop(void *p)
4151 #endif /* def _WIN32 */
4154 /*********************************************************************
4156 * Function : listen_loop
4158 * Description : bind the listen port and enter a "FOREVER" listening loop.
4164 *********************************************************************/
4165 static void listen_loop(void)
4167 struct client_state *csp = NULL;
4169 struct configuration_spec * config;
4171 config = load_config();
4173 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4175 * XXX: Should be relocated once it no
4176 * longer needs to emit log messages.
4178 initialize_reusable_connections();
4179 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4181 bfd = bind_port_helper(config);
4183 #ifdef FEATURE_GRACEFUL_TERMINATION
4184 while (!g_terminate)
4189 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
4190 while (waitpid(-1, NULL, WNOHANG) > 0)
4192 /* zombie children */
4194 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
4197 * Free data that was used by died threads
4203 * Re-open the errlog after HUP signal
4205 if (received_hup_signal)
4207 if (NULL != config->logfile)
4209 init_error_log(Argv[0], config->logfile);
4211 received_hup_signal = 0;
4215 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
4217 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
4221 csp->flags |= CSP_FLAG_ACTIVE;
4222 csp->sfd = JB_INVALID_SOCKET;
4224 csp->config = config = load_config();
4226 if ( config->need_bind )
4229 * Since we were listening to the "old port", we will not see
4230 * a "listen" param change until the next IJB request. So, at
4231 * least 1 more request must be made for us to find the new
4232 * setting. I am simply closing the old socket and binding the
4235 * Which-ever is correct, we will serve 1 more page via the
4236 * old settings. This should probably be a "show-proxy-args"
4237 * request. This should not be a so common of an operation
4238 * that this will hurt people's feelings.
4243 bfd = bind_port_helper(config);
4246 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
4248 if (!accept_connection(csp, bfd))
4250 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
4263 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
4266 #ifdef FEATURE_TOGGLE
4267 if (global_toggle_state)
4268 #endif /* def FEATURE_TOGGLE */
4270 csp->flags |= CSP_FLAG_TOGGLED_ON;
4273 if (run_loader(csp))
4275 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
4276 /* Never get here - LOG_LEVEL_FATAL causes program exit */
4280 if (block_acl(NULL,csp))
4282 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
4283 close_socket(csp->cfd);
4287 #endif /* def FEATURE_ACL */
4289 /* add it to the list of clients */
4290 csp->next = clients->next;
4291 clients->next = csp;
4293 if (config->multi_threaded)
4297 /* this is a switch () statment in the C preprocessor - ugh */
4298 #undef SELECTED_ONE_OPTION
4300 /* Use Pthreads in preference to native code */
4301 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
4302 #define SELECTED_ONE_OPTION
4304 pthread_t the_thread;
4305 pthread_attr_t attrs;
4307 pthread_attr_init(&attrs);
4308 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
4309 errno = pthread_create(&the_thread, &attrs,
4310 (void * (*)(void *))serve, csp);
4311 child_id = errno ? -1 : 0;
4312 pthread_attr_destroy(&attrs);
4316 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
4317 #define SELECTED_ONE_OPTION
4318 child_id = _beginthread(
4319 (void (*)(void *))serve,
4324 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
4325 #define SELECTED_ONE_OPTION
4326 child_id = _beginthread(
4327 (void(* _Optlink)(void*))serve,
4333 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
4334 #define SELECTED_ONE_OPTION
4336 thread_id tid = spawn_thread
4337 (server_thread, "server", B_NORMAL_PRIORITY, csp);
4339 if ((tid >= 0) && (resume_thread(tid) == B_OK))
4341 child_id = (int) tid;
4350 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
4351 #define SELECTED_ONE_OPTION
4352 csp->cfd = ReleaseSocket(csp->cfd, -1);
4355 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4356 NP_Output, Output(),
4357 NP_CloseOutput, FALSE,
4358 NP_Name, (ULONG)"privoxy child",
4362 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
4363 NP_Output, Output(),
4364 NP_CloseOutput, FALSE,
4365 NP_Name, (ULONG)"privoxy child",
4366 NP_StackSize, 200*1024,
4372 ((struct Task *)child_id)->tc_UserData = csp;
4373 Signal((struct Task *)child_id, SIGF_SINGLE);
4378 #if !defined(SELECTED_ONE_OPTION)
4381 /* This block is only needed when using fork().
4382 * When using threads, the server thread was
4383 * created and run by the call to _beginthread().
4385 if (child_id == 0) /* child */
4388 #ifdef FEATURE_TOGGLE
4389 int inherited_toggle_state = global_toggle_state;
4390 #endif /* def FEATURE_TOGGLE */
4395 * If we've been toggled or we've blocked the request, tell Mom
4398 #ifdef FEATURE_TOGGLE
4399 if (inherited_toggle_state != global_toggle_state)
4401 rc |= RC_FLAG_TOGGLED;
4403 #endif /* def FEATURE_TOGGLE */
4405 #ifdef FEATURE_STATISTICS
4406 if (csp->flags & CSP_FLAG_REJECTED)
4408 rc |= RC_FLAG_BLOCKED;
4410 #endif /* ndef FEATURE_STATISTICS */
4414 else if (child_id > 0) /* parent */
4416 /* in a fork()'d environment, the parent's
4417 * copy of the client socket and the CSP
4421 #if !defined(_WIN32) && !defined(__CYGWIN__)
4423 wait( &child_status );
4426 * Evaluate child's return code: If the child has
4427 * - been toggled, toggle ourselves
4428 * - blocked its request, bump up the stats counter
4431 #ifdef FEATURE_TOGGLE
4432 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
4434 global_toggle_state = !global_toggle_state;
4436 #endif /* def FEATURE_TOGGLE */
4438 #ifdef FEATURE_STATISTICS
4440 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
4444 #endif /* def FEATURE_STATISTICS */
4446 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
4447 close_socket(csp->cfd);
4448 csp->flags &= ~CSP_FLAG_ACTIVE;
4452 #undef SELECTED_ONE_OPTION
4453 /* end of cpp switch () */
4458 * Spawning the child failed, assume it's because
4459 * there are too many children running already.
4460 * XXX: If you assume ...
4462 log_error(LOG_LEVEL_ERROR,
4463 "Unable to take any additional connections: %E");
4464 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
4465 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
4466 close_socket(csp->cfd);
4467 csp->flags &= ~CSP_FLAG_ACTIVE;
4476 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
4478 /* Clean up. Aim: free all memory (no leaks) */
4479 #ifdef FEATURE_GRACEFUL_TERMINATION
4481 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
4483 unload_current_config_file();
4484 unload_current_actions_file();
4485 unload_current_re_filterfile();
4486 #ifdef FEATURE_TRUST
4487 unload_current_trust_file();
4490 if (config->multi_threaded)
4497 } while ((clients->next != NULL) && (--i > 0));
4501 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
4512 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
4513 /* Cleanup - remove taskbar icon etc. */
4518 #endif /* FEATURE_GRACEFUL_TERMINATION */