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tor-android/external/privoxy/jcc.c

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const char jcc_rcs[] = "$Id: jcc.c,v 1.235 2009/03/18 21:01:20 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/jcc.c,v $
*
* Purpose : Main file. Contains main() method, main loop, and
* the main connection-handling function.
*
* Copyright : Written by and Copyright (C) 2001-2009 the SourceForge
* Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
* by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* The GNU General Public License should be included with
* this file. If not, you can view it at
* http://www.gnu.org/copyleft/gpl.html
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Revisions :
* $Log: jcc.c,v $
* Revision 1.235 2009/03/18 21:01:20 fabiankeil
* Comment fix. Spotted by Roland.
*
* Revision 1.234 2009/03/18 20:48:42 fabiankeil
* If the --no-daemon option is used, enable LOG_LEVEL_INFO
* before the config file has been parsed (as we always did).
*
* Revision 1.233 2009/03/13 14:10:07 fabiankeil
* Fix some more harmless warnings on amd64.
*
* Revision 1.232 2009/03/08 19:29:16 fabiankeil
* Reinitialize the timeout structure every time before passing
* it to select(). Apparently some implementations mess with it.
* Probably fixes #2669131 reported by cyberpatrol.
*
* Revision 1.231 2009/03/08 14:19:23 fabiankeil
* Fix justified (but harmless) compiler warnings
* on platforms where sizeof(int) < sizeof(long).
*
* Revision 1.230 2009/03/07 13:09:17 fabiankeil
* Change csp->expected_content and_csp->expected_content_length from
* size_t to unsigned long long to reduce the likelihood of integer
* overflows that would let us close the connection prematurely.
* Bug found while investigating #2669131, reported by cyberpatrol.
*
* Revision 1.229 2009/03/07 11:17:01 fabiankeil
* Fix compiler warning.
*
* Revision 1.228 2009/03/06 20:30:13 fabiankeil
* Log unsigned values as such.
*
* Revision 1.227 2009/03/02 19:18:11 fabiankeil
* Streamline parse_http_request()'s prototype. As
* cparser pointed out it doesn't actually use csp.
*
* Revision 1.226 2009/03/01 18:28:24 fabiankeil
* Help clang understand that we aren't dereferencing
* NULL pointers here.
*
* Revision 1.225 2009/02/19 18:09:32 fabiankeil
* Unbreak build without FEATURE_CONNECTION_KEEP_ALIVE.
* Noticed by David.
*
* Revision 1.224 2009/02/14 15:32:04 fabiankeil
* Add the request URL to the timeout message in chat().
* Suggested by Lee.
*
* Revision 1.223 2009/02/09 21:21:16 fabiankeil
* Now that init_log_module() is called earlier, call show_version()
* later on from main() directly so it doesn't get called for --help
* or --version.
*
* Revision 1.222 2009/02/08 12:56:51 fabiankeil
* Call initialize_mutexes() before init_log_module() again.
* Broken since r220, might be the cause of Lee's #2579448.
*
* Revision 1.221 2009/02/06 18:02:58 fabiankeil
* When dropping privileges, also give up membership in supplementary
* groups. Thanks to Matthias Drochner for reporting the problem,
* providing the initial patch and testing the final version.
*
* Revision 1.220 2009/02/04 18:29:07 fabiankeil
* Initialize the log module before parsing arguments.
* Thanks to Matthias Drochner for the report.
*
* Revision 1.219 2009/01/31 16:08:21 fabiankeil
* Remove redundant error check in receive_client_request().
*
* Revision 1.218 2009/01/31 12:25:54 fabiankeil
* Flatten indentation in receive_client_request().
*
* Revision 1.217 2009/01/07 19:50:09 fabiankeil
* - If the socket-timeout has been reached and the client
* hasn't received any data yet, send an explanation before
* closing the connection.
* - In get_request_line(), signal timeouts the right way.
*
* Revision 1.216 2008/12/24 22:13:11 ler762
* fix GCC 3.4.4 warning
*
* Revision 1.215 2008/12/24 17:06:19 fabiankeil
* Keep a thread around to timeout alive connections
* even if no new requests are coming in.
*
* Revision 1.214 2008/12/20 14:53:55 fabiankeil
* Add config option socket-timeout to control the time
* Privoxy waits for data to arrive on a socket. Useful
* in case of stale ssh tunnels or when fuzz-testing.
*
* Revision 1.213 2008/12/15 18:45:51 fabiankeil
* When logging crunches, log the whole URL, so one can easily
* differentiate between vanilla HTTP and CONNECT requests.
*
* Revision 1.212 2008/12/14 15:46:22 fabiankeil
* Give crunched requests their own log level.
*
* Revision 1.211 2008/12/06 10:05:03 fabiankeil
* Downgrade "Received x bytes while expecting y." message to
* LOG_LEVEL_CONNECT as it doesn't necessarily indicate an error.
*
* Revision 1.210 2008/12/02 22:03:18 fabiankeil
* Don't miscalculate byte_count if we don't get all the
* server headers with one read_socket() call. With keep-alive
* support enabled, this caused delays until the server closed
* the connection.
*
* Revision 1.209 2008/11/27 09:44:04 fabiankeil
* Cosmetics for the last commit: Don't watch out for
* the last chunk if the content isn't chunk-encoded or
* if we already determined the content length previously.
*
* Revision 1.208 2008/11/26 18:24:17 fabiankeil
* Recognize that the server response is complete if the
* last chunk is read together with the server headers.
* Reported by Lee.
*
* Revision 1.207 2008/11/25 17:25:16 fabiankeil
* Don't convert the client-header list to text until we need to.
*
* Revision 1.206 2008/11/23 17:00:11 fabiankeil
* Some more chat() cosmetics.
*
* Revision 1.205 2008/11/16 12:43:49 fabiankeil
* Turn keep-alive support into a runtime feature
* that is disabled by setting keep-alive-timeout
* to a negative value.
*
* Revision 1.204 2008/11/06 19:42:17 fabiankeil
* Fix last-chunk detection hack to also apply
* if buf[] contains nothing but the last-chunk.
*
* Revision 1.203 2008/11/06 18:34:35 fabiankeil
* Factor receive_client_request() and
* parse_client_request() out of chat().
*
* Revision 1.202 2008/11/02 18:40:34 fabiankeil
* If we received a different amount of data than we expected,
* log a warning and make sure the server socket isn't reused.
*
* Revision 1.201 2008/11/02 16:48:20 fabiankeil
* Revert revision 1.195 and try again.
*
* Revision 1.200 2008/10/26 16:53:18 fabiankeil
* Fix gcc44 warning.
*
* Revision 1.199 2008/10/26 15:36:10 fabiankeil
* Remove two debug messages with LOG_LEVEL_INFO.
*
* Revision 1.198 2008/10/22 15:19:55 fabiankeil
* Once More, With Feeling: if there is no logfile
* because the user didn't specify one, we shouldn't
* call init_error_log() after receiving SIGHUP either.
*
* Revision 1.197 2008/10/20 17:02:40 fabiankeil
* If SIGHUP is received while we aren't running in daemon
* mode, calling init_error_log() would be a mistake.
*
* Revision 1.196 2008/10/16 09:16:41 fabiankeil
* - Fix two gcc44 conversion warnings.
* - Don't bother logging the last five bytes
* of the 0-chunk.
*
* Revision 1.195 2008/10/13 16:04:37 fabiankeil
* Make sure we don't try to reuse tainted server sockets.
*
* Revision 1.194 2008/10/12 18:35:18 fabiankeil
* The last commit was a bit too ambitious, apparently the content
* length adjustment is only necessary if we aren't buffering.
*
* Revision 1.193 2008/10/12 15:57:35 fabiankeil
* Fix content length calculation if we read headers
* and the start of the body at once. Now that we have
* FEATURE_CONNECTION_KEEP_ALIVE, it actually matters.
*
* Revision 1.192 2008/10/11 18:19:14 fabiankeil
* Even more chat() cosmetics.
*
* Revision 1.191 2008/10/11 18:00:14 fabiankeil
* Reformat some comments in chat().
*
* Revision 1.190 2008/10/11 14:58:00 fabiankeil
* In case of chunk-encoded content, stop reading if
* the buffer looks like it ends with the last chunk.
*
* Revision 1.189 2008/10/11 09:53:00 fabiankeil
* Let server_response_is_complete() deal properly with
* content that is neither buffered nor read all at once.
*
* Revision 1.188 2008/10/09 18:21:41 fabiankeil
* Flush work-in-progress changes to keep outgoing connections
* alive where possible. Incomplete and mostly #ifdef'd out.
*
* Revision 1.187 2008/09/07 12:35:05 fabiankeil
* Add mutex lock support for _WIN32.
*
* Revision 1.186 2008/09/04 08:13:58 fabiankeil
* Prepare for critical sections on Windows by adding a
* layer of indirection before the pthread mutex functions.
*
* Revision 1.185 2008/08/30 12:03:07 fabiankeil
* Remove FEATURE_COOKIE_JAR.
*
* Revision 1.184 2008/08/22 15:34:45 fabiankeil
* - Silence LLVM/Clang complaint.
* - Make received_hup_signal static.
* - Hide definitions for basedir, pidfile and received_hup_signal
* from __EMX__ as they only seem to be used in case of #ifdef unix.
*
* Revision 1.183 2008/08/21 07:09:35 fabiankeil
* Accept Shoutcast responses again. Problem reported
* and fix suggested by Stefan in #2062860.
*
* Revision 1.182 2008/06/27 11:13:56 fabiankeil
* Fix possible NULL-pointer dereference reported
* by din_a4 in #2003937. Pointy hat to me.
*
* Revision 1.181 2008/05/21 15:47:15 fabiankeil
* Streamline sed()'s prototype and declare
* the header parse and add structures static.
*
* Revision 1.180 2008/05/21 15:26:32 fabiankeil
* - Mark csp as immutable for send_crunch_response().
* - Fix comment spelling.
*
* Revision 1.179 2008/05/20 20:13:32 fabiankeil
* Factor update_server_headers() out of sed(), ditch the
* first_run hack and make server_patterns_light static.
*
* Revision 1.178 2008/05/10 13:23:38 fabiankeil
* Don't provide get_header() with the whole client state
* structure when it only needs access to csp->iob.
*
* Revision 1.177 2008/05/10 11:51:12 fabiankeil
* Make the "read the rest of the headers" loop a bit more readable.
*
* Revision 1.176 2008/05/10 11:37:57 fabiankeil
* - Instead of logging when the IIS5 hack is enabled, log when it fails.
* - Remove useless comment.
*
* Revision 1.175 2008/05/09 18:53:59 fabiankeil
* Fix comment grammar.
*
* Revision 1.174 2008/05/07 18:05:53 fabiankeil
* Remove the pointless buffer in client_protocol_is_unsupported().
*
* Revision 1.173 2008/05/06 15:09:00 fabiankeil
* Least-effort fix for bug #1821930 (reported by Lee):
* If the response doesn't look like HTTP,
* tell the client and log the problem.
*
* Revision 1.172 2008/04/16 16:38:21 fabiankeil
* Don't pass the whole csp structure to flush_socket()
* when it only needs a file descriptor and a buffer.
*
* Revision 1.171 2008/03/27 18:27:25 fabiankeil
* Remove kill-popups action.
*
* Revision 1.170 2008/03/06 16:33:46 fabiankeil
* If limit-connect isn't used, don't limit CONNECT requests to port 443.
*
* Revision 1.169 2008/03/04 18:30:39 fabiankeil
* Remove the treat-forbidden-connects-like-blocks action. We now
* use the "blocked" page for forbidden CONNECT requests by default.
*
* Revision 1.168 2008/03/02 12:25:25 fabiankeil
* Also use shiny new connect_port_is_forbidden() in jcc.c.
*
* Revision 1.167 2008/02/23 16:57:12 fabiankeil
* Rename url_actions() to get_url_actions() and let it
* use the standard parameter ordering.
*
* Revision 1.166 2008/02/23 16:33:43 fabiankeil
* Let forward_url() use the standard parameter ordering
* and mark its second parameter immutable.
*
* Revision 1.165 2008/02/02 19:36:56 fabiankeil
* Remove the "Listening ... for local connections only" log message.
* Whether or not remote connections are able to reach Privoxy is up
* to the operating system.
*
* Revision 1.164 2007/12/16 18:32:46 fabiankeil
* Prevent the log messages for CONNECT requests to unacceptable
* ports from printing the limit-connect argument as [null] if
* limit-connect hasn't been explicitly enabled.
*
* Revision 1.163 2007/12/13 01:47:11 david__schmidt
* Make sure all console-mode apps get a usage() instance
*
* Revision 1.162 2007/12/06 17:54:57 fabiankeil
* Reword NO_SERVER_DATA_RESPONSE to make it harder
* to misunderstand what the message is all about.
*
* Revision 1.161 2007/12/04 19:44:22 fabiankeil
* Unbreak trustfile which previously didn't work without
* FEATURE_TOGGLE. Fixes BR#1843585, reported by Lee.
*
* Revision 1.160 2007/11/29 18:00:29 fabiankeil
* Plug memory leak. Spotted by Valgrind, triggered by
* Privoxy-Regression-Test feeding proxyfuzz.py.
*
* Revision 1.159 2007/11/24 14:34:09 fabiankeil
* In the HTTP snipplets, refer to the client as client.
*
* Revision 1.158 2007/11/11 16:44:17 fabiankeil
* Emit a log message when activating the MS IIS5 hack.
*
* Revision 1.157 2007/11/03 17:34:49 fabiankeil
* Log the "weak randomization factor" warning only
* once for mingw32 and provide some more details.
*
* Revision 1.156 2007/11/01 18:20:58 fabiankeil
* Initialize log module after initializing mutexes, future
* deadlocks in that code should now work cross-platform.
*
* Revision 1.155 2007/10/23 20:12:45 fabiankeil
* Fix first CSUCCEED line to end in \r\n as required by RFC1945.
* Reported by Bert van Leeuwen in BR#1818808.
*
* Revision 1.154 2007/10/19 17:00:08 fabiankeil
* Downgrade "Flushing header and buffers" message to LOG_LEVEL_INFO.
*
* Revision 1.153 2007/10/14 14:12:41 fabiankeil
* When in daemon mode, close stderr after the configuration file has been
* parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
*
* Revision 1.152 2007/10/04 18:03:34 fabiankeil
* - Fix a crash when parsing invalid requests whose first header
* is rejected by get_header(). Regression (re?)introduced
* in r1.143 by yours truly.
* - Move ACTION_VANILLA_WAFER handling into parsers.c's
* client_cookie_adder() to make sure send-vanilla-wafer can be
* controlled through tags (and thus regression-tested).
*
* Revision 1.151 2007/09/29 10:21:16 fabiankeil
* - Move get_filter_function() from jcc.c to filters.c
* so the filter functions can be static.
* - Don't bother filtering body-less responses.
*
* Revision 1.150 2007/09/28 16:39:29 fabiankeil
* Execute content filters through execute_content_filter().
*
* Revision 1.149 2007/09/04 15:08:48 fabiankeil
* Initialize req to NULL to make sure it's defined if the
* first read_socket() call fails. Reported by icmp30.
*
* Revision 1.148 2007/08/26 16:47:13 fabiankeil
* Add Stephen Gildea's --pre-chroot-nslookup patch [#1276666],
* extensive comments moved to user manual.
*
* Revision 1.147 2007/08/25 14:42:40 fabiankeil
* Don't crash if a broken header filter wiped out the request line.
*
* Revision 1.146 2007/08/20 17:09:32 fabiankeil
* Fix byte_count calculation in case of flushes
* and don't parse the server headers a second time.
*
* Revision 1.145 2007/08/19 13:13:31 fabiankeil
* - If there's a connection problem after we already forwarded
* parts of the original content, just hang up. Fixes BR#1776724.
* - Fix warnings about unused code on mingw32.
* - In case of flushes, calculate the byte count
* less incorrectly (I think).
*
* Revision 1.144 2007/08/11 14:43:22 fabiankeil
* Add some more prototypes for static functions.
*
* Revision 1.143 2007/08/05 13:58:19 fabiankeil
* Comment out request_contains_null_bytes() until it's used again.
*
* Revision 1.142 2007/08/05 13:50:26 fabiankeil
* #1763173 from Stefan Huehner: s@const static@static const@
* and declare some more functions static.
*
* Revision 1.141 2007/08/04 09:56:23 fabiankeil
* - Log rejected CONNECT requests with LOG_LEVEL_INFO
* and explain why they were rejected in the first place.
* - Fix the LOG_LEVEL_CLF message for crunches of unallowed
* CONNECT requests. The request line was missing.
* - Add two more XXX reminders as we don't have enough already.
*
* Revision 1.140 2007/07/21 11:51:36 fabiankeil
* As Hal noticed, checking dispatch_cgi() as the last cruncher
* looks like a bug if CGI requests are blocked unintentionally,
* so don't do it unless the user enabled the new config option
* "allow-cgi-request-crunching".
*
* Revision 1.139 2007/07/14 07:46:41 fabiankeil
* - Allow to rewrite the request destination behind the client's back.
* - Turn the weird-looking unconditional for loop that
* reads the client request into a conditional while loop.
* Move the stuff that only runs once out of the loop.
* - Move parts of chat(), server_content_type() and the
* necessary stuff to fix BR#1750917 into get_filter_function().
*
* Revision 1.138 2007/06/03 18:45:18 fabiankeil
* Temporary workaround for BR#1730105.
*
* Revision 1.137 2007/06/01 18:16:36 fabiankeil
* Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
* deadlocks and crashes on OpenBSD and possibly other OS with neither
* gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
* Thanks to Ralf Horstmann for report and solution.
*
* Revision 1.136 2007/06/01 16:41:11 fabiankeil
* Add forward-override{} to change the forwarding settings through
* action sections. This is mainly interesting to forward different
* clients differently (for example based on User-Agent or request
* origin).
*
* Revision 1.135 2007/05/24 17:03:50 fabiankeil
* - Let usage() mention the --chroot parameter.
* - Use read_socket() consistently and always leave
* the last buffer byte alone, even in cases where
* null termination (currently) doesn't matter.
*
* Revision 1.134 2007/05/16 14:59:46 fabiankeil
* - Fix config file loading on Unix if no config file is specified.
* Since r1.97 Privoxy would always interpret the last argument as
* config file, even if it's a valid command line option.
* - Abort in case of unrecognized command line options. Closes #1719696.
* - Remove a bunch of unnecessary strcpy() calls (yay for c&p without thinking).
* - Replace the remaining strcpy() and strcat() calls with strlcpy() and strcat().
*
* Revision 1.133 2007/05/04 11:23:19 fabiankeil
* - Don't rerun crunchers that only depend on the request URL.
* - Don't count redirects and CGI requests as "blocked requests".
*
* Revision 1.132 2007/04/25 15:15:17 fabiankeil
* Support crunching based on tags created by server-header taggers.
*
* Revision 1.131 2007/04/22 13:24:50 fabiankeil
* Make HTTP snippets static (again). Add a Content-Type for those
* with content so the browser doesn't guess it based on the URL.
*
* Revision 1.130 2007/04/19 13:47:34 fabiankeil
* Move crunching and request line rebuilding out of chat().
*
* Revision 1.129 2007/04/15 16:39:20 fabiankeil
* Introduce tags as alternative way to specify which
* actions apply to a request. At the moment tags can be
* created based on client and server headers.
*
* Revision 1.128 2007/03/25 16:55:54 fabiankeil
* Don't CLF-log CONNECT requests twice.
*
* Revision 1.127 2007/03/20 13:53:17 fabiankeil
* Log the source address for ACL-related connection drops.
*
* Revision 1.126 2007/03/17 15:20:05 fabiankeil
* New config option: enforce-blocks.
*
* Revision 1.125 2007/03/09 14:12:00 fabiankeil
* - Move null byte check into separate function.
* - Don't confuse the client with error pages
* if a CONNECT request was already confirmed.
*
* Revision 1.124 2007/02/23 14:59:54 fabiankeil
* Speed up NULL byte escaping and only log the complete
* NULL byte requests with header debugging enabled.
*
* Revision 1.123 2007/02/21 18:42:10 fabiankeil
* Answer requests that contain NULL bytes with
* a custom response instead of waiting for more
* data until the client eventually hangs up.
*
* Revision 1.122 2007/02/07 11:12:02 fabiankeil
* - Move delivery and logging of crunched responses
* from chat() into send_crunch_response().
* - Display the reason for generating http_responses.
* - Log the content length for LOG_LEVEL_CLF correctly
* (still incorrect for some fixed responses).
* - Reword an incorrect comment about
* treat-forbidden-connects-like-blocks violating
* the specs.
* - Add some log messages.
*
* Revision 1.121 2007/01/27 10:52:56 fabiankeil
* Move mutex initialization into separate
* function and exit in case of errors.
*
* Revision 1.120 2007/01/26 14:18:42 fabiankeil
* - Start to reduce chat()'s line count and move
* parts of it into separate functions.
* - Add "HTTP/1.1 100 Continue" hack for BR 756734.
*
* Revision 1.119 2007/01/25 14:02:30 fabiankeil
* - Add Proxy-Agent header to HTTP snippets that are
* supposed to reach HTTP clients only.
* - Made a few CONNECT log messages more descriptive.
* - Catch completely empty server responses (as seen
* with Tor's fake ".noconnect" top level domain).
* - Use shiny new "forwarding-failed" template for socks errors.
*
* Revision 1.118 2007/01/07 07:43:43 joergs
* AmigaOS4 support added.
*
* Revision 1.117 2006/12/31 17:56:37 fabiankeil
* Added config option accept-intercepted-requests
* and disabled it by default.
*
* Revision 1.116 2006/12/29 19:08:22 fabiankeil
* Reverted parts of my last commit
* to keep error handling working.
*
* Revision 1.115 2006/12/29 17:38:57 fabiankeil
* Fixed gcc43 conversion warnings.
*
* Revision 1.114 2006/12/27 18:52:02 fabiankeil
* Fix -pedantic ISO C warning about converting
* from function pointer to object pointer.
*
* Revision 1.113 2006/12/26 17:38:50 fabiankeil
* Silence compiler warning I introduced with my last commit.
*
* Revision 1.112 2006/12/26 17:31:41 fabiankeil
* Mutex protect rand() if POSIX threading
* is used, warn the user if that's not possible
* and stop using it on _WIN32 where it could
* cause crashes.
*
* Revision 1.111 2006/12/23 16:15:06 fabiankeil
* Don't prevent core dumps by catching SIGABRT.
* It's rude and makes debugging unreasonable painful.
*
* Revision 1.110 2006/12/13 14:52:53 etresoft
* Fix build failure on MacOS X. Global symbols can be either static or extern, but not both.
*
* Revision 1.109 2006/12/06 19:41:40 fabiankeil
* Privoxy is now able to run as intercepting
* proxy in combination with any packet filter
* that does the port redirection. The destination
* is extracted from the "Host:" header which
* should be available for nearly all requests.
*
* Moved HTTP snipplets into jcc.c.
* Added error message for gopher proxy requests.
*
* Revision 1.108 2006/11/28 15:38:51 fabiankeil
* Only unlink the pidfile if it's actually used.
*
* Change order of interception checks to make
* it possible to block or redirect requests for
* the cgi pages.
*
* Revision 1.107 2006/11/13 19:05:51 fabiankeil
* Make pthread mutex locking more generic. Instead of
* checking for OSX and OpenBSD, check for FEATURE_PTHREAD
* and use mutex locking unless there is an _r function
* available. Better safe than sorry.
*
* Fixes "./configure --disable-pthread" and should result
* in less threading-related problems on pthread-using platforms,
* but it still doesn't fix BR#1122404.
*
* Revision 1.106 2006/11/06 19:58:23 fabiankeil
* Move pthread.h inclusion from jcc.c to jcc.h.
* Fixes build on x86-freebsd1 (FreeBSD 5.4-RELEASE).
*
* Revision 1.105 2006/11/06 14:26:02 fabiankeil
* Don't exit after receiving the second SIGHUP on Solaris.
*
* Fixes BR 1052235, but the same problem may exist on other
* systems. Once 3.0.6 is out we should use sigset()
* where available and see if it breaks anything.
*
* Revision 1.104 2006/09/23 13:26:38 roro
* Replace TABs by spaces in source code.
*
* Revision 1.103 2006/09/21 12:54:43 fabiankeil
* Fix +redirect{}. Didn't work with -fast-redirects.
*
* Revision 1.102 2006/09/06 13:03:04 fabiankeil
* Respond with 400 and a short text message
* if the client tries to use Privoxy as FTP proxy.
*
* Revision 1.101 2006/09/06 09:23:37 fabiankeil
* Make number of retries in case of forwarded-connect problems
* a config file option (forwarded-connect-retries) and use 0 as
* default.
*
* Revision 1.100 2006/09/03 19:42:59 fabiankeil
* Set random(3) seed.
*
* Revision 1.99 2006/09/02 15:36:42 fabiankeil
* Follow the OpenBSD port's lead and protect the resolve
* functions on OpenBSD as well.
*
* Revision 1.98 2006/08/24 11:01:34 fabiankeil
* --user fix. Only use the user as group if no group is specified.
* Solves BR 1492612. Thanks to Spinor S. and David Laight.
*
* Revision 1.97 2006/08/18 15:23:17 david__schmidt
* Windows service (re-)integration
*
* The new args are:
*
* --install[:service_name]
* --uninstall[:service_name]
* --service
*
* They work as follows:
* --install will create a service for you and then terminate.
* By default the service name will be "privoxy" (without the quotes).
* However you can run multiple services if you wish, just by adding
* a colon and then a name (no spaces).
*
* --uninstall follows the exact same rules a --install.
*
* --service is used when the program is executed by the service
* control manager, and in normal circumstances would never be
* used as a command line argument.
*
* Revision 1.96 2006/08/15 20:12:36 david__schmidt
* Windows service integration
*
* Revision 1.95 2006/08/03 02:46:41 david__schmidt
* Incorporate Fabian Keil's patch work:
http://www.fabiankeil.de/sourcecode/privoxy/
*
* Revision 1.94 2006/07/18 14:48:46 david__schmidt
* Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
* with what was really the latest development (the v_3_0_branch branch)
*
* Revision 1.92.2.16 2005/04/03 20:10:50 david__schmidt
* Thanks to Jindrich Makovicka for a race condition fix for the log
* file. The race condition remains for non-pthread implementations.
* Reference patch #1175720.
*
* Revision 1.92.2.15 2004/10/03 12:53:32 david__schmidt
* Add the ability to check jpeg images for invalid
* lengths of comment blocks. Defensive strategy
* against the exploit:
* Microsoft Security Bulletin MS04-028
* Buffer Overrun in JPEG Processing (GDI+) Could
* Allow Code Execution (833987)
* Enabled with +inspect-jpegs in actions files.
*
* Revision 1.92.2.14 2003/12/12 12:52:53 oes
* - Fixed usage info for non-unix platforms
* - Fixed small cmdline parsing bug
*
* Revision 1.92.2.13 2003/11/27 19:20:27 oes
* Diagnostics: Now preserve the returncode of pthread_create
* in errno. Closes BR #775721. Thanks to Geoffrey Hausheer.
*
* Revision 1.92.2.12 2003/07/11 11:34:19 oes
* No longer ignore SIGCHLD. Fixes bug #769381
*
* Revision 1.92.2.11 2003/05/14 12:32:02 oes
* Close jarfile on graceful exit, remove stray line
*
* Revision 1.92.2.10 2003/05/08 15:13:46 oes
* Cosmetics: Killed a warning, a typo and an allocation left at exit
*
* Revision 1.92.2.9 2003/04/03 15:08:42 oes
* No longer rely on non-POSIX.1 extensions of getcwd().
* Fixes bug #711001
*
* Revision 1.92.2.8 2003/03/31 13:12:32 oes
* Replaced setenv() by posix-compliant putenv()
* Thanks to Neil McCalden (nmcc AT users.sf.net).
*
* Revision 1.92.2.7 2003/03/17 16:48:59 oes
* Added chroot ability, thanks to patch by Sviatoslav Sviridov
*
* Revision 1.92.2.6 2003/03/11 11:55:00 oes
* Clean-up and extension of improvements for forked mode:
* - Child's return code now consists of flags RC_FLAG_*
* - Reporting toggle to parent now properly #ifdef'ed
* - Children now report blocking to parent. This enables
* statistics in forked mode
*
* Revision 1.92.2.5 2003/03/10 23:45:32 oes
* Fixed bug #700381: Non-Threaded version now capable of being toggled.
* Children now report having been toggled through _exit(17), parents
* watch for that code and toggle themselves if found.
*
* Revision 1.92.2.4 2003/03/07 03:41:04 david__schmidt
* Wrapping all *_r functions (the non-_r versions of them) with
* mutex semaphores for OSX. Hopefully this will take care of all
* of those pesky crash reports.
*
* Revision 1.92.2.3 2003/02/28 12:53:06 oes
* Fixed two mostly harmless mem leaks
*
* Revision 1.92.2.2 2002/11/20 14:37:47 oes
* Fix: Head of global clients list now initialized to NULL
*
* Revision 1.92.2.1 2002/09/25 14:52:24 oes
* Added basic support for OPTIONS and TRACE HTTP methods:
* - New interceptor direct_response() added in chat().
* - sed() moved to earlier in the process, so that the
* Host: header is evaluated before actions and forwarding
* are decided on.
*
* Revision 1.92 2002/05/08 16:00:46 oes
* Chat's buffer handling:
* - Fixed bug with unchecked out-of-mem conditions
* while reading client request & server headers
* - No longer predict if the buffer limit will be exceeded
* in the next read -- check add_to_iob's new
* return code. If buffer couldn't be extended
* (policy or out-of-mem) while
* - reading from client: abort
* - reading server headers: send error page
* - buffering server body for filter: flush,
* and if that fails: send error page
*
* Revision 1.91 2002/04/08 20:35:58 swa
* fixed JB spelling
*
* Revision 1.90 2002/04/02 14:57:28 oes
* Made sending wafers independent of FEATURE_COOKIE_JAR
*
* Revision 1.89 2002/03/31 17:18:59 jongfoster
* Win32 only: Enabling STRICT to fix a VC++ compile warning.
*
* Revision 1.88 2002/03/27 14:32:43 david__schmidt
* More compiler warning message maintenance
*
* Revision 1.87 2002/03/26 22:29:54 swa
* we have a new homepage!
*
* Revision 1.86 2002/03/25 17:04:55 david__schmidt
* Workaround for closing the jarfile before load_config() comes around again
*
* Revision 1.85 2002/03/24 15:23:33 jongfoster
* Name changes
*
* Revision 1.84 2002/03/24 13:25:43 swa
* name change related issues
*
* Revision 1.83 2002/03/16 23:54:06 jongfoster
* Adding graceful termination feature, to help look for memory leaks.
* If you enable this (which, by design, has to be done by hand
* editing config.h) and then go to http://i.j.b/die, then the program
* will exit cleanly after the *next* request. It should free all the
* memory that was used.
*
* Revision 1.82 2002/03/13 00:27:05 jongfoster
* Killing warnings
*
* Revision 1.81 2002/03/12 01:42:50 oes
* Introduced modular filters
*
* Revision 1.80 2002/03/11 22:07:05 david__schmidt
* OS/2 port maintenance:
* - Fixed EMX build - it had decayed a little
* - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
* substituted a memset for now.
*
* Revision 1.79 2002/03/09 20:03:52 jongfoster
* - Making various functions return int rather than size_t.
* (Undoing a recent change). Since size_t is unsigned on
* Windows, functions like read_socket that return -1 on
* error cannot return a size_t.
*
* THIS WAS A MAJOR BUG - it caused frequent, unpredictable
* crashes, and also frequently caused JB to jump to 100%
* CPU and stay there. (Because it thought it had just
* read ((unsigned)-1) == 4Gb of data...)
*
* - The signature of write_socket has changed, it now simply
* returns success=0/failure=nonzero.
*
* - Trying to get rid of a few warnings --with-debug on
* Windows, I've introduced a new type "jb_socket". This is
* used for the socket file descriptors. On Windows, this
* is SOCKET (a typedef for unsigned). Everywhere else, it's
* an int. The error value can't be -1 any more, so it's
* now JB_INVALID_SOCKET (which is -1 on UNIX, and in
* Windows it maps to the #define INVALID_SOCKET.)
*
* - The signature of bind_port has changed.
*
* Revision 1.78 2002/03/08 21:35:04 oes
* Added optional group supplement to --user option. Will now use default group of user if no group given
*
* Revision 1.77 2002/03/07 03:52:06 oes
* - Fixed compiler warnings etc
* - Improved handling of failed DNS lookups
*
* Revision 1.76 2002/03/06 22:54:35 jongfoster
* Automated function-comment nitpicking.
*
* Revision 1.75 2002/03/06 10:02:19 oes
* Fixed stupid bug when --user was not given
*
* Revision 1.74 2002/03/06 00:49:31 jongfoster
* Fixing warning on Windows
* Making #ifdefs that refer to the same variable consistently
* use #ifdef unix rather than mixing #ifdef unix & #ifndef OS2
*
* Revision 1.73 2002/03/05 23:57:30 hal9
* Stray character 's' on line 1618 was breaking build.
*
* Revision 1.72 2002/03/05 21:33:45 david__schmidt
* - Re-enable OS/2 building after new parms were added
* - Fix false out of memory report when resolving CGI templates when no IP
* address is available of failed attempt (a la no such domain)
*
* Revision 1.71 2002/03/05 18:13:56 oes
* Added --user option
*
* Revision 1.70 2002/03/05 04:52:42 oes
* Deleted non-errlog debugging code
*
* Revision 1.69 2002/03/04 23:50:00 jongfoster
* Splitting off bind_port() call into bind_port_helper(), with
* improved logging.
*
* Revision 1.68 2002/03/04 20:17:32 oes
* Fixed usage info
*
* Revision 1.67 2002/03/04 18:18:57 oes
* - Removed _DEBUG mode
* - Cleand up cmdline parsing
* - Introduced --no-daemon, --pidfile options
* - Cleaned up signal handling:
* - Terminate cleanly on INT, TERM and ABRT
* - Schedule logfile for re-opening on HUP
* - Ignore CHLD and PIPE
* - Leave the rest with their default handlers
* - Uniform handler registration
* - Added usage() function
* - Played styleguide police
*
* Revision 1.66 2002/03/03 15:06:55 oes
* Re-enabled automatic config reloading
*
* Revision 1.65 2002/03/03 14:49:11 oes
* Fixed CLF logging: Now uses client's original HTTP request
*
* Revision 1.64 2002/03/03 09:18:03 joergs
* Made jumbjuster work on AmigaOS again.
*
* Revision 1.63 2002/03/02 04:14:50 david__schmidt
* Clean up a little CRLF unpleasantness that suddenly appeared
*
* Revision 1.62 2002/02/20 23:17:23 jongfoster
* Detecting some out-of memory conditions and exiting with a log message.
*
* Revision 1.61 2002/01/17 21:01:52 jongfoster
* Moving all our URL and URL pattern parsing code to urlmatch.c.
*
* Revision 1.60 2001/12/30 14:07:32 steudten
* - Add signal handling (unix)
* - Add SIGHUP handler (unix)
* - Add creation of pidfile (unix)
* - Add action 'top' in rc file (RH)
* - Add entry 'SIGNALS' to manpage
* - Add exit message to logfile (unix)
*
* Revision 1.59 2001/12/13 14:07:18 oes
* Fixed Bug: 503 error page now sent OK
*
* Revision 1.58 2001/11/30 23:37:24 jongfoster
* Renaming the Win32 config file to config.txt - this is almost the
* same as the corresponding UNIX name "config"
*
* Revision 1.57 2001/11/16 00:47:43 jongfoster
* Changing the tty-disconnection code to use setsid().
*
* Revision 1.56 2001/11/13 20:20:54 jongfoster
* Tabs->spaces, fixing a bug with missing {} around an if()
*
* Revision 1.55 2001/11/13 20:14:53 jongfoster
* Patch for FreeBSD setpgrp() as suggested by Alexander Lazic
*
* Revision 1.54 2001/11/07 00:03:14 steudten
* Give reliable return value if an error
* occurs not just 0 with new daemon mode.
*
* Revision 1.53 2001/11/05 21:41:43 steudten
* Add changes to be a real daemon just for unix os.
* (change cwd to /, detach from controlling tty, set
* process group and session leader to the own process.
* Add DBG() Macro.
* Add some fatal-error log message for failed malloc().
* Add '-d' if compiled with 'configure --with-debug' to
* enable debug output.
*
* Revision 1.52 2001/10/26 20:11:20 jongfoster
* Fixing type mismatch
*
* Revision 1.51 2001/10/26 17:38:28 oes
* Cosmetics
*
* Revision 1.50 2001/10/25 03:40:48 david__schmidt
* Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
* threads to call select() simultaneously. So, it's time to do a real, live,
* native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
* (native). Both versions will work, but using __OS2__ offers multi-threading.
*
* Revision 1.49 2001/10/23 21:41:35 jongfoster
* Added call to initialize the (statically-allocated of course)
* "out of memory" CGI response.
*
* Revision 1.48 2001/10/10 19:56:46 jongfoster
* Moving some code that wasn't cookie-related out of an #ifdef
* FEATURE_COOKIE_JAR
*
* Revision 1.47 2001/10/10 16:44:36 oes
* Added CONNECT destination port limitation check
*
* Revision 1.46 2001/10/08 15:17:41 oes
* Re-enabled SSL forwarding
*
* Revision 1.45 2001/10/07 15:42:11 oes
* Replaced 6 boolean members of csp with one bitmap (csp->flags)
*
* Moved downgrading of the HTTP version from parse_http_request to
* chat(), since we can't decide if it is necessary before we have
* determined the actions for the URL. The HTTP command is now
* *always* re-built so the repairs need no longer be special-cased.
*
* filter_popups now gets a csp pointer so it can raise the new
* CSP_FLAG_MODIFIED flag.
*
* Bugfix
*
* Added configurable size limit for the IOB. If the IOB grows so
* large that the next read would exceed the limit, the header
* is generated, and the header & unfiltered buffer are flushed
* to the client. Chat then continues in non-buffering,
* non-filtering body mode.
*
* Revision 1.44 2001/10/02 18:13:57 oes
* Ooops
*
* Revision 1.43 2001/10/02 15:32:13 oes
* Moved generation of hdr
*
* Revision 1.42 2001/09/21 23:02:02 david__schmidt
* Cleaning up 2 compiler warnings on OS/2.
*
* Revision 1.41 2001/09/16 17:05:14 jongfoster
* Removing unused #include showarg.h
*
* Revision 1.40 2001/09/16 15:41:45 jongfoster
* Fixing signed/unsigned comparison warning.
*
* Revision 1.39 2001/09/16 13:21:27 jongfoster
* Changes to use new list functions.
*
* Revision 1.38 2001/09/16 13:01:46 jongfoster
* Removing redundant function call that zeroed zalloc()'d memory.
*
* Revision 1.37 2001/09/10 11:12:24 oes
* Deleted unused variable
*
* Revision 1.36 2001/09/10 10:56:15 oes
* Silenced compiler warnings
*
* Revision 1.35 2001/07/31 14:44:22 oes
* Deleted unused size parameter from filter_popups()
*
* Revision 1.34 2001/07/30 22:08:36 jongfoster
* Tidying up #defines:
* - All feature #defines are now of the form FEATURE_xxx
* - Permanently turned off WIN_GUI_EDIT
* - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
*
* Revision 1.33 2001/07/29 19:32:00 jongfoster
* Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
*
* Revision 1.32 2001/07/29 18:47:05 jongfoster
* Adding missing #include "loadcfg.h"
*
* Revision 1.31 2001/07/29 12:17:48 oes
* Applied pthread fix by Paul Lieverse
*
* Revision 1.30 2001/07/25 22:57:13 jongfoster
* __BEOS__ no longer overrides FEATURE_PTHREAD.
* This is because FEATURE_PTHREAD will soon be widely used, so I
* want to keep it simple.
*
* Revision 1.29 2001/07/24 12:47:06 oes
* Applied BeOS support update by Eugenia
*
* Revision 1.28 2001/07/23 13:26:12 oes
* Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
*
* Revision 1.27 2001/07/19 19:09:47 haroon
* - Added code to take care of the situation where while processing the first
* server response (which includes the server header), after finding the end
* of the headers we were not looking past the end of the headers for
* content modification. I enabled it for filter_popups.
* Someone else should look to see if other similar operations should be
* done to the discarded portion of the buffer.
*
* Note 2001/07/20: No, the other content modification mechanisms will process
* the whole iob later anyway. --oes
*
* Revision 1.26 2001/07/18 12:31:36 oes
* cosmetics
*
* Revision 1.25 2001/07/15 19:43:49 jongfoster
* Supports POSIX threads.
* Also removed some unused #includes.
*
* Revision 1.24 2001/07/13 14:00:40 oes
* - Generic content modification scheme:
* Each feature has its own applicability flag that is set
* from csp->action->flags.
* Replaced the "filtering" int flag , by a function pointer
* "content_filter" to the function that will do the content
* modification. If it is != NULL, the document will be buffered
* and processed through *content_filter, which must set
* csp->content_length and return a modified copy of the body
* or return NULL (on failiure).
* - Changed csp->is_text to the more generic bitmap csp->content_type
* which can currently take the valued CT_TEXT or CT_GIF
* - Reformatting etc
* - Removed all #ifdef PCRS
*
* Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
* Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
* the `block_acl' call. This prevents a compilation error when the user
* does not wish to use the "ACL" feature.
*
* Revision 1.22 2001/06/29 21:45:41 oes
* Indentation, CRLF->LF, Tab-> Space
*
* Revision 1.21 2001/06/29 13:29:36 oes
* - Cleaned up, improved comments
* - Unified all possible interceptors (CGI,
* block, trust, fast_redirect) in one
* place, with one (CGI) answer generation
* mechansim. Much clearer now.
* - Removed the GIF image generation, which
* is now done in filters.c:block_url()
* - Made error conditions like domain lookup
* failiure or (various) problems while talking
* to the server use cgi.c:error_response()
* instead of generating HTML/HTTP in chat() (yuck!)
* - Removed logentry from cancelled commit
*
* Revision 1.20 2001/06/09 10:55:28 jongfoster
* Changing BUFSIZ ==> BUFFER_SIZE
*
* Revision 1.19 2001/06/07 23:12:52 jongfoster
* Replacing function pointer in struct gateway with a directly
* called function forwarded_connect().
* Replacing struct gateway with struct forward_spec
*
* Revision 1.18 2001/06/03 19:12:16 oes
* introduced new cgi handling
*
* Revision 1.17 2001/06/01 20:07:23 jongfoster
* Now uses action +image-blocker{} rather than config->tinygif
*
* Revision 1.16 2001/06/01 18:49:17 jongfoster
* Replaced "list_share" with "list" - the tiny memory gain was not
* worth the extra complexity.
*
* Revision 1.15 2001/05/31 21:24:47 jongfoster
* Changed "permission" to "action" throughout.
* Removed DEFAULT_USER_AGENT - it must now be specified manually.
* Moved vanilla wafer check into chat(), since we must now
* decide whether or not to add it based on the URL.
*
* Revision 1.14 2001/05/29 20:14:01 joergs
* AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
* increased.
*
* Revision 1.13 2001/05/29 09:50:24 jongfoster
* Unified blocklist/imagelist/permissionslist.
* File format is still under discussion, but the internal changes
* are (mostly) done.
*
* Also modified interceptor behaviour:
* - We now intercept all URLs beginning with one of the following
* prefixes (and *only* these prefixes):
* * http://i.j.b/
* * http://ijbswa.sf.net/config/
* * http://ijbswa.sourceforge.net/config/
* - New interceptors "home page" - go to http://i.j.b/ to see it.
* - Internal changes so that intercepted and fast redirect pages
* are not replaced with an image.
* - Interceptors now have the option to send a binary page direct
* to the client. (i.e. ijb-send-banner uses this)
* - Implemented show-url-info interceptor. (Which is why I needed
* the above interceptors changes - a typical URL is
* "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
* The previous mechanism would not have intercepted that, and
* if it had been intercepted then it then it would have replaced
* it with an image.)
*
* Revision 1.12 2001/05/27 22:17:04 oes
*
* - re_process_buffer no longer writes the modified buffer
* to the client, which was very ugly. It now returns the
* buffer, which it is then written by chat.
*
* - content_length now adjusts the Content-Length: header
* for modified documents rather than crunch()ing it.
* (Length info in csp->content_length, which is 0 for
* unmodified documents)
*
* - For this to work, sed() is called twice when filtering.
*
* Revision 1.11 2001/05/26 17:27:53 jongfoster
* Added support for CLF and fixed LOG_LEVEL_LOG.
* Also did CRLF->LF fix of my previous patch.
*
* Revision 1.10 2001/05/26 15:26:15 jongfoster
* ACL feature now provides more security by immediately dropping
* connections from untrusted hosts.
*
* Revision 1.9 2001/05/26 00:28:36 jongfoster
* Automatic reloading of config file.
* Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
* Most of the global variables have been moved to a new
* struct configuration_spec, accessed through csp->config->globalname
* Most of the globals remaining are used by the Win32 GUI.
*
* Revision 1.8 2001/05/25 22:43:18 jongfoster
* Fixing minor memory leak and buffer overflow.
*
* Revision 1.7 2001/05/25 22:34:30 jongfoster
* Hard tabs->Spaces
*
* Revision 1.6 2001/05/23 00:13:58 joergs
* AmigaOS support fixed.
*
* Revision 1.5 2001/05/22 18:46:04 oes
*
* - Enabled filtering banners by size rather than URL
* by adding patterns that replace all standard banner
* sizes with the "Junkbuster" gif to the re_filterfile
*
* - Enabled filtering WebBugs by providing a pattern
* which kills all 1x1 images
*
* - Added support for PCRE_UNGREEDY behaviour to pcrs,
* which is selected by the (nonstandard and therefore
* capital) letter 'U' in the option string.
* It causes the quantifiers to be ungreedy by default.
* Appending a ? turns back to greedy (!).
*
* - Added a new interceptor ijb-send-banner, which
* sends back the "Junkbuster" gif. Without imagelist or
* MSIE detection support, or if tinygif = 1, or the
* URL isn't recognized as an imageurl, a lame HTML
* explanation is sent instead.
*
* - Added new feature, which permits blocking remote
* script redirects and firing back a local redirect
* to the browser.
* The feature is conditionally compiled, i.e. it
* can be disabled with --disable-fast-redirects,
* plus it must be activated by a "fast-redirects"
* line in the config file, has its own log level
* and of course wants to be displayed by show-proxy-args
* Note: Boy, all the #ifdefs in 1001 locations and
* all the fumbling with configure.in and acconfig.h
* were *way* more work than the feature itself :-(
*
* - Because a generic redirect template was needed for
* this, tinygif = 3 now uses the same.
*
* - Moved GIFs, and other static HTTP response templates
* to project.h
*
* - Some minor fixes
*
* - Removed some >400 CRs again (Jon, you really worked
* a lot! ;-)
*
* Revision 1.4 2001/05/21 19:34:01 jongfoster
* Made failure to bind() a fatal error.
*
* Revision 1.3 2001/05/20 01:21:20 jongfoster
* Version 2.9.4 checkin.
* - Merged popupfile and cookiefile, and added control over PCRS
* filtering, in new "permissionsfile".
* - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
* file error you now get a message box (in the Win32 GUI) rather
* than the program exiting with no explanation.
* - Made killpopup use the PCRS MIME-type checking and HTTP-header
* skipping.
* - Removed tabs from "config"
* - Moved duplicated url parsing code in "loaders.c" to a new funcition.
* - Bumped up version number.
*
* Revision 1.2 2001/05/17 22:34:44 oes
* - Added hint on GIF char array generation to jcc.c
* - Cleaned CRLF's from the sources and related files
* - Repaired logging for REF and FRC
*
* Revision 1.1.1.1 2001/05/15 13:58:56 oes
* Initial import of version 2.9.3 source tree
*
*
*********************************************************************/
#include "config.h"
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <assert.h>
#ifdef _WIN32
# ifndef FEATURE_PTHREAD
# ifndef STRICT
# define STRICT
# endif
# include <windows.h>
# include <process.h>
# endif /* ndef FEATURE_PTHREAD */
# include "win32.h"
# ifndef _WIN_CONSOLE
# include "w32log.h"
# endif /* ndef _WIN_CONSOLE */
# include "w32svrapi.h"
#else /* ifndef _WIN32 */
# if !defined (__OS2__)
# include <unistd.h>
# include <sys/wait.h>
# endif /* ndef __OS2__ */
# include <sys/time.h>
# include <sys/stat.h>
# include <sys/ioctl.h>
#ifdef sun
#include <sys/termios.h>
#endif /* sun */
#ifdef unix
#include <pwd.h>
#include <grp.h>
#endif
# include <signal.h>
# ifdef __BEOS__
# include <socket.h> /* BeOS has select() for sockets only. */
# include <OS.h> /* declarations for threads and stuff. */
# endif
# if defined(__EMX__) || defined(__OS2__)
# include <sys/select.h> /* OS/2/EMX needs a little help with select */
# endif
# ifdef __OS2__
#define INCL_DOS
# include <os2.h>
#define bzero(B,N) memset(B,0x00,n)
# endif
# ifndef FD_ZERO
# include <select.h>
# endif
#endif
#include "project.h"
#include "list.h"
#include "jcc.h"
#include "filters.h"
#include "loaders.h"
#include "parsers.h"
#include "miscutil.h"
#include "errlog.h"
#include "jbsockets.h"
#include "gateway.h"
#include "actions.h"
#include "cgi.h"
#include "loadcfg.h"
#include "urlmatch.h"
const char jcc_h_rcs[] = JCC_H_VERSION;
const char project_h_rcs[] = PROJECT_H_VERSION;
int no_daemon = 0;
struct client_state clients[1];
struct file_list files[1];
#ifdef FEATURE_STATISTICS
int urls_read = 0; /* total nr of urls read inc rejected */
int urls_rejected = 0; /* total nr of urls rejected */
#endif /* def FEATURE_STATISTICS */
#ifdef FEATURE_GRACEFUL_TERMINATION
int g_terminate = 0;
#endif
#if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
static void sig_handler(int the_signal);
#endif
static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
static jb_err get_server_headers(struct client_state *csp);
static const char *crunch_reason(const struct http_response *rsp);
static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
static char *get_request_line(struct client_state *csp);
static jb_err receive_client_request(struct client_state *csp);
static jb_err parse_client_request(struct client_state *csp);
static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
static jb_err change_request_destination(struct client_state *csp);
static void chat(struct client_state *csp);
static void serve(struct client_state *csp);
#if !defined(_WIN32) || defined(_WIN_CONSOLE)
static void usage(const char *myname);
#endif
static void initialize_mutexes(void);
static jb_socket bind_port_helper(struct configuration_spec *config);
static void listen_loop(void);
#ifdef AMIGA
void serve(struct client_state *csp);
#else /* ifndef AMIGA */
static void serve(struct client_state *csp);
#endif /* def AMIGA */
#ifdef __BEOS__
static int32 server_thread(void *data);
#endif /* def __BEOS__ */
#ifdef _WIN32
#define sleep(N) Sleep(((N) * 1000))
#endif
#ifdef __OS2__
#define sleep(N) DosSleep(((N) * 100))
#endif
#ifdef MUTEX_LOCKS_AVAILABLE
/*
* XXX: Does the locking stuff really belong in this file?
*/
privoxy_mutex_t log_mutex;
privoxy_mutex_t log_init_mutex;
privoxy_mutex_t connection_reuse_mutex;
#if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
privoxy_mutex_t resolver_mutex;
#endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
#ifndef HAVE_GMTIME_R
privoxy_mutex_t gmtime_mutex;
#endif /* ndef HAVE_GMTIME_R */
#ifndef HAVE_LOCALTIME_R
privoxy_mutex_t localtime_mutex;
#endif /* ndef HAVE_GMTIME_R */
#ifndef HAVE_RANDOM
privoxy_mutex_t rand_mutex;
#endif /* ndef HAVE_RANDOM */
#endif /* def MUTEX_LOCKS_AVAILABLE */
#if defined(unix)
const char *basedir = NULL;
const char *pidfile = NULL;
static int received_hup_signal = 0;
#endif /* defined unix */
/* HTTP snipplets. */
static const char CSUCCEED[] =
"HTTP/1.0 200 Connection established\r\n"
"Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
static const char CHEADER[] =
"HTTP/1.0 400 Invalid header received from client\r\n"
"Proxy-Agent: Privoxy " VERSION "\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Invalid header received from client.\r\n";
static const char FTP_RESPONSE[] =
"HTTP/1.0 400 Invalid request received from client\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Invalid request. Privoxy doesn't support FTP.\r\n";
static const char GOPHER_RESPONSE[] =
"HTTP/1.0 400 Invalid request received from client\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Invalid request. Privoxy doesn't support gopher.\r\n";
/* XXX: should be a template */
static const char MISSING_DESTINATION_RESPONSE[] =
"HTTP/1.0 400 Bad request received from client\r\n"
"Proxy-Agent: Privoxy " VERSION "\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Bad request. Privoxy was unable to extract the destination.\r\n";
/* XXX: should be a template */
static const char NO_SERVER_DATA_RESPONSE[] =
"HTTP/1.0 502 Server or forwarder response empty\r\n"
"Proxy-Agent: Privoxy " VERSION "\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Empty server or forwarder response.\r\n"
"The connection has been closed but Privoxy didn't receive any data.\r\n";
/* XXX: should be a template */
static const char INVALID_SERVER_HEADERS_RESPONSE[] =
"HTTP/1.0 502 Server or forwarder response invalid\r\n"
"Proxy-Agent: Privoxy " VERSION "\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
#if 0
/* XXX: should be a template */
static const char NULL_BYTE_RESPONSE[] =
"HTTP/1.0 400 Bad request received from client\r\n"
"Proxy-Agent: Privoxy " VERSION "\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Bad request. Null byte(s) before end of request.\r\n";
#endif
/* XXX: should be a template */
static const char MESSED_UP_REQUEST_RESPONSE[] =
"HTTP/1.0 400 Malformed request after rewriting\r\n"
"Proxy-Agent: Privoxy " VERSION "\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Bad request. Messed up with header filters.\r\n";
/* XXX: should be a template */
static const char CONNECTION_TIMEOUT_RESPONSE[] =
"HTTP/1.0 502 Connection timeout\r\n"
"Proxy-Agent: Privoxy " VERSION "\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"The connection timed out.\r\n";
/* A function to crunch a response */
typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
/* Crunch function flags */
#define CF_NO_FLAGS 0
/* Cruncher applies to forced requests as well */
#define CF_IGNORE_FORCE 1
/* Crunched requests are counted for the block statistics */
#define CF_COUNT_AS_REJECT 2
/* A crunch function and its flags */
struct cruncher
{
const crunch_func_ptr cruncher;
const int flags;
};
static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
/* Complete list of cruncher functions */
static const struct cruncher crunchers_all[] = {
{ direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
{ block_url, CF_COUNT_AS_REJECT },
#ifdef FEATURE_TRUST
{ trust_url, CF_COUNT_AS_REJECT },
#endif /* def FEATURE_TRUST */
{ redirect_url, CF_NO_FLAGS },
{ dispatch_cgi, CF_IGNORE_FORCE},
{ NULL, 0 }
};
/* Light version, used after tags are applied */
static const struct cruncher crunchers_light[] = {
{ block_url, CF_COUNT_AS_REJECT },
{ redirect_url, CF_NO_FLAGS },
{ NULL, 0 }
};
/*
* XXX: Don't we really mean
*
* #if defined(unix)
*
* here?
*/
#if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
/*********************************************************************
*
* Function : sig_handler
*
* Description : Signal handler for different signals.
* Exit gracefully on TERM and INT
* or set a flag that will cause the errlog
* to be reopened by the main thread on HUP.
*
* Parameters :
* 1 : the_signal = the signal cause this function to call
*
* Returns : -
*
*********************************************************************/
static void sig_handler(int the_signal)
{
switch(the_signal)
{
case SIGTERM:
case SIGINT:
log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
#if defined(unix)
if(pidfile)
{
unlink(pidfile);
}
#endif /* unix */
exit(the_signal);
break;
case SIGHUP:
#if defined(unix)
received_hup_signal = 1;
#endif
break;
default:
/*
* We shouldn't be here, unless we catch signals
* in main() that we can't handle here!
*/
log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
}
return;
}
#endif
/*********************************************************************
*
* Function : client_protocol_is_unsupported
*
* Description : Checks if the client used a known unsupported
* protocol and deals with it by sending an error
* response.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 2 : req = the first request line send by the client
*
* Returns : TRUE if an error response has been generated, or
* FALSE if the request doesn't look invalid.
*
*********************************************************************/
static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
{
/*
* If it's a FTP or gopher request, we don't support it.
*
* These checks are better than nothing, but they might
* not work in all configurations and some clients might
* have problems digesting the answer.
*
* They should, however, never cause more problems than
* Privoxy's old behaviour (returning the misleading HTML
* error message:
*
* "Could not resolve http://(ftp|gopher)://example.org").
*/
if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
{
const char *response = NULL;
const char *protocol = NULL;
if (!strncmpic(req, "GET ftp://", 10))
{
response = FTP_RESPONSE;
protocol = "FTP";
}
else
{
response = GOPHER_RESPONSE;
protocol = "GOPHER";
}
log_error(LOG_LEVEL_ERROR,
"%s tried to use Privoxy as %s proxy: %s",
csp->ip_addr_str, protocol, req);
log_error(LOG_LEVEL_CLF,
"%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
freez(req);
write_socket(csp->cfd, response, strlen(response));
return TRUE;
}
return FALSE;
}
/*********************************************************************
*
* Function : get_request_destination_elsewhere
*
* Description : If the client's request was redirected into
* Privoxy without the client's knowledge,
* the request line lacks the destination host.
*
* This function tries to get it elsewhere,
* provided accept-intercepted-requests is enabled.
*
* "Elsewhere" currently only means "Host: header",
* but in the future we may ask the redirecting
* packet filter to look the destination up.
*
* If the destination stays unknown, an error
* response is send to the client and headers
* are freed so that chat() can return directly.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 2 : headers = a header list
*
* Returns : JB_ERR_OK if the destination is now known, or
* JB_ERR_PARSE if it isn't.
*
*********************************************************************/
static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
{
char *req;
if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
{
log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
" Privoxy isn't configured to accept intercepted requests.",
csp->ip_addr_str, csp->http->cmd);
/* XXX: Use correct size */
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
csp->ip_addr_str, csp->http->cmd);
write_socket(csp->cfd, CHEADER, strlen(CHEADER));
destroy_list(headers);
return JB_ERR_PARSE;
}
else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
{
/* Split the domain we just got for pattern matching */
init_domain_components(csp->http);
return JB_ERR_OK;
}
else
{
/* We can't work without destination. Go spread the news.*/
req = list_to_text(headers);
chomp(req);
/* XXX: Use correct size */
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
csp->ip_addr_str, csp->http->cmd);
log_error(LOG_LEVEL_ERROR,
"Privoxy was unable to get the destination for %s's request:\n%s\n%s",
csp->ip_addr_str, csp->http->cmd, req);
freez(req);
write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
destroy_list(headers);
return JB_ERR_PARSE;
}
/*
* TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
* to get the destination IP address, use it as host directly
* or do a reverse DNS lookup first.
*/
}
/*********************************************************************
*
* Function : get_server_headers
*
* Description : Parses server headers in iob and fills them
* into csp->headers so that they can later be
* handled by sed().
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : JB_ERR_OK if everything went fine, or
* JB_ERR_PARSE if the headers were incomplete.
*
*********************************************************************/
static jb_err get_server_headers(struct client_state *csp)
{
int continue_hack_in_da_house = 0;
char * header;
while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
{
if (header == NULL)
{
/*
* continue hack in da house. Ignore the ending of
* this head and continue enlisting header lines.
* The reason is described below.
*/
enlist(csp->headers, "");
continue_hack_in_da_house = 0;
continue;
}
else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
{
/*
* It's a bodyless continue response, don't
* stop header parsing after reaching its end.
*
* As a result Privoxy will concatenate the
* next response's head and parse and deliver
* the headers as if they belonged to one request.
*
* The client will separate them because of the
* empty line between them.
*
* XXX: What we're doing here is clearly against
* the intended purpose of the continue header,
* and under some conditions (HTTP/1.0 client request)
* it's a standard violation.
*
* Anyway, "sort of against the spec" is preferable
* to "always getting confused by Continue responses"
* (Privoxy's behaviour before this hack was added)
*/
log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
continue_hack_in_da_house = 1;
}
else if (*header == '\0')
{
/*
* If the header is empty, but the Continue hack
* isn't active, we can assume that we reached the
* end of the buffer before we hit the end of the
* head.
*
* Inform the caller an let it decide how to handle it.
*/
return JB_ERR_PARSE;
}
if (JB_ERR_MEMORY == enlist(csp->headers, header))
{
/*
* XXX: Should we quit the request and return a
* out of memory error page instead?
*/
log_error(LOG_LEVEL_ERROR,
"Out of memory while enlisting server headers. %s lost.",
header);
}
freez(header);
}
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : crunch_reason
*
* Description : Translates the crunch reason code into a string.
*
* Parameters :
* 1 : rsp = a http_response
*
* Returns : A string with the crunch reason or an error description.
*
*********************************************************************/
static const char *crunch_reason(const struct http_response *rsp)
{
char * reason = NULL;
assert(rsp != NULL);
if (rsp == NULL)
{
return "Internal error while searching for crunch reason";
}
switch (rsp->reason)
{
case RSP_REASON_UNSUPPORTED:
reason = "Unsupported HTTP feature";
break;
case RSP_REASON_BLOCKED:
reason = "Blocked";
break;
case RSP_REASON_UNTRUSTED:
reason = "Untrusted";
break;
case RSP_REASON_REDIRECTED:
reason = "Redirected";
break;
case RSP_REASON_CGI_CALL:
reason = "CGI Call";
break;
case RSP_REASON_NO_SUCH_DOMAIN:
reason = "DNS failure";
break;
case RSP_REASON_FORWARDING_FAILED:
reason = "Forwarding failed";
break;
case RSP_REASON_CONNECT_FAILED:
reason = "Connection failure";
break;
case RSP_REASON_OUT_OF_MEMORY:
reason = "Out of memory (may mask other reasons)";
break;
default:
reason = "No reason recorded";
break;
}
return reason;
}
/*********************************************************************
*
* Function : send_crunch_response
*
* Description : Delivers already prepared response for
* intercepted requests, logs the interception
* and frees the response.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 1 : rsp = Fully prepared response. Will be freed on exit.
*
* Returns : Nothing.
*
*********************************************************************/
static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
{
const struct http_request *http = csp->http;
char status_code[4];
assert(rsp != NULL);
assert(rsp->head != NULL);
if (rsp == NULL)
{
/*
* Not supposed to happen. If it does
* anyway, treat it as an unknown error.
*/
cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
/* return code doesn't matter */
}
if (rsp == NULL)
{
/* If rsp is still NULL, we have serious internal problems. */
log_error(LOG_LEVEL_FATAL,
"NULL response in send_crunch_response and cgi_error_unknown failed as well.");
}
/*
* Extract the status code from the actual head
* that was send to the client. It is the only
* way to get it right for all requests, including
* the fixed ones for out-of-memory problems.
*
* A head starts like this: 'HTTP/1.1 200...'
* 0123456789|11
* 10
*/
status_code[0] = rsp->head[9];
status_code[1] = rsp->head[10];
status_code[2] = rsp->head[11];
status_code[3] = '\0';
/* Write the answer to the client */
if (write_socket(csp->cfd, rsp->head, rsp->head_length)
|| write_socket(csp->cfd, rsp->body, rsp->content_length))
{
/* There is nothing we can do about it. */
log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
}
/* Log that the request was crunched and why. */
log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
/* Clean up and return */
if (cgi_error_memory() != rsp)
{
free_http_response(rsp);
}
return;
}
#if 0
/*********************************************************************
*
* Function : request_contains_null_bytes
*
* Description : Checks for NULL bytes in the request and sends
* an error message to the client if any were found.
*
* XXX: currently not used, see comment in chat().
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 2 : buf = Data from the client's request to check.
* 3 : len = The data length.
*
* Returns : TRUE if the request contained one or more NULL bytes, or
* FALSE otherwise.
*
*********************************************************************/
static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
{
size_t c_len; /* Request lenght when treated as C string */
c_len = strlen(buf);
if (c_len < len)
{
/*
* Null byte(s) found. Log the request,
* return an error response and hang up.
*/
size_t tmp_len = c_len;
do
{
/*
* Replace NULL byte(s) with '<27>' characters
* so the request can be logged as string.
* XXX: Is there a better replacement character?
*/
buf[tmp_len]='<27>';
tmp_len += strlen(buf+tmp_len);
} while (tmp_len < len);
log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
"(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
log_error(LOG_LEVEL_HEADER,
"Offending request data with NULL bytes turned into \'<27>\' characters: %s", buf);
write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
/* XXX: Log correct size */
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
return TRUE;
}
return FALSE;
}
#endif
/*********************************************************************
*
* Function : crunch_response_triggered
*
* Description : Checks if the request has to be crunched,
* and delivers the crunch response if necessary.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 2 : crunchers = list of cruncher functions to run
*
* Returns : TRUE if the request was answered with a crunch response
* FALSE otherwise.
*
*********************************************************************/
static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
{
struct http_response *rsp = NULL;
const struct cruncher *c;
/*
* If CGI request crunching is disabled,
* check the CGI dispatcher out of order to
* prevent unintentional blocks or redirects.
*/
if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
&& (NULL != (rsp = dispatch_cgi(csp))))
{
/* Deliver, log and free the interception response. */
send_crunch_response(csp, rsp);
return TRUE;
}
for (c = crunchers; c->cruncher != NULL; c++)
{
/*
* Check the cruncher if either Privoxy is toggled
* on and the request isn't forced, or if the cruncher
* applies to forced requests as well.
*/
if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
!(csp->flags & CSP_FLAG_FORCED)) ||
(c->flags & CF_IGNORE_FORCE))
{
rsp = c->cruncher(csp);
if (NULL != rsp)
{
/* Deliver, log and free the interception response. */
send_crunch_response(csp, rsp);
#ifdef FEATURE_STATISTICS
if (c->flags & CF_COUNT_AS_REJECT)
{
csp->flags |= CSP_FLAG_REJECTED;
}
#endif /* def FEATURE_STATISTICS */
return TRUE;
}
}
}
return FALSE;
}
/*********************************************************************
*
* Function : build_request_line
*
* Description : Builds the HTTP request line.
*
* If a HTTP forwarder is used it expects the whole URL,
* web servers only get the path.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 2 : fwd = The forwarding spec used for the request
* XXX: Should use http->fwd instead.
* 3 : request_line = The old request line which will be replaced.
*
* Returns : Nothing. Terminates in case of memory problems.
*
*********************************************************************/
static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
{
struct http_request *http = csp->http;
assert(http->ssl == 0);
/*
* Downgrade http version from 1.1 to 1.0
* if +downgrade action applies.
*/
if ( (csp->action->flags & ACTION_DOWNGRADE)
&& (!strcmpic(http->ver, "HTTP/1.1")))
{
freez(http->ver);
http->ver = strdup("HTTP/1.0");
if (http->ver == NULL)
{
log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
}
}
/*
* Rebuild the request line.
*/
freez(*request_line);
*request_line = strdup(http->gpc);
string_append(request_line, " ");
if (fwd->forward_host)
{
string_append(request_line, http->url);
}
else
{
string_append(request_line, http->path);
}
string_append(request_line, " ");
string_append(request_line, http->ver);
if (*request_line == NULL)
{
log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
}
log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
}
/*********************************************************************
*
* Function : change_request_destination
*
* Description : Parse a (rewritten) request line and regenerate
* the http request data.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : Forwards the parse_http_request() return code.
* Terminates in case of memory problems.
*
*********************************************************************/
static jb_err change_request_destination(struct client_state *csp)
{
struct http_request *http = csp->http;
jb_err err;
log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
free_http_request(http);
err = parse_http_request(csp->headers->first->str, http);
if (JB_ERR_OK != err)
{
log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
jb_err_to_string(err));
}
else
{
/* XXX: ocmd is a misleading name */
http->ocmd = strdup(http->cmd);
if (http->ocmd == NULL)
{
log_error(LOG_LEVEL_FATAL,
"Out of memory copying rewritten HTTP request line");
}
}
return err;
}
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
/*********************************************************************
*
* Function : server_response_is_complete
*
* Description : Determines whether we should stop reading
* from the server socket.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 2 : content_length = Length of content received so far.
*
* Returns : TRUE if the response is complete,
* FALSE otherwise.
*
*********************************************************************/
static int server_response_is_complete(struct client_state *csp,
unsigned long long content_length)
{
int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
if (!strcmpic(csp->http->gpc, "HEAD"))
{
/*
* "HEAD" implies no body, we are thus expecting
* no content. XXX: incomplete "list" of methods?
*/
csp->expected_content_length = 0;
content_length_known = TRUE;
}
if (csp->http->status == 304)
{
/*
* Expect no body. XXX: incomplete "list" of status codes?
*/
csp->expected_content_length = 0;
content_length_known = TRUE;
}
return (content_length_known && ((0 == csp->expected_content_length)
|| (csp->expected_content_length <= content_length)));
}
/*********************************************************************
*
* Function : wait_for_alive_connections
*
* Description : Waits for alive connections to timeout.
*
* Parameters : N/A
*
* Returns : N/A
*
*********************************************************************/
static void wait_for_alive_connections()
{
int connections_alive = close_unusable_connections();
while (0 < connections_alive)
{
log_error(LOG_LEVEL_CONNECT,
"Waiting for %d connections to timeout.",
connections_alive);
sleep(60);
connections_alive = close_unusable_connections();
}
log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
}
#endif /* FEATURE_CONNECTION_KEEP_ALIVE */
/*********************************************************************
*
* Function : mark_server_socket_tainted
*
* Description : Makes sure we don't reuse a server socket
* (if we didn't read everything the server sent
* us reusing the socket would lead to garbage).
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : void.
*
*********************************************************************/
static void mark_server_socket_tainted(struct client_state *csp)
{
if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
{
log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
}
}
/*********************************************************************
*
* Function : get_request_line
*
* Description : Read the client request line.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : Pointer to request line or NULL in case of errors.
*
*********************************************************************/
static char *get_request_line(struct client_state *csp)
{
char buf[BUFFER_SIZE];
char *request_line = NULL;
int len;
memset(buf, 0, sizeof(buf));
do
{
if (!data_is_available(csp->cfd, csp->config->socket_timeout))
{
log_error(LOG_LEVEL_ERROR,
"Stopped waiting for the request line.");
write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
strlen(CONNECTION_TIMEOUT_RESPONSE));
return NULL;
}
len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
if (len <= 0) return NULL;
/*
* If there is no memory left for buffering the
* request, there is nothing we can do but hang up
*/
if (add_to_iob(csp, buf, len))
{
return NULL;
}
request_line = get_header(csp->iob);
} while ((NULL != request_line) && ('\0' == *request_line));
return request_line;
}
/*********************************************************************
*
* Function : receive_client_request
*
* Description : Read the client's request (more precisely the
* client headers) and answer it if necessary.
*
* Note that since we're not using select() we could get
* blocked here if a client connected, then didn't say
* anything!
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
*
*********************************************************************/
static jb_err receive_client_request(struct client_state *csp)
{
char buf[BUFFER_SIZE];
char *p;
char *req = NULL;
struct http_request *http;
int len;
jb_err err;
/* Temporary copy of the client's headers before they get enlisted in csp->headers */
struct list header_list;
struct list *headers = &header_list;
http = csp->http;
memset(buf, 0, sizeof(buf));
req = get_request_line(csp);
if (req == NULL)
{
return JB_ERR_PARSE;
}
assert(*req != '\0');
if (client_protocol_is_unsupported(csp, req))
{
return JB_ERR_PARSE;
}
#ifdef FEATURE_FORCE_LOAD
/*
* If this request contains the FORCE_PREFIX and blocks
* aren't enforced, get rid of it and set the force flag.
*/
if (strstr(req, FORCE_PREFIX))
{
if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
{
log_error(LOG_LEVEL_FORCE,
"Ignored force prefix in request: \"%s\".", req);
}
else
{
strclean(req, FORCE_PREFIX);
log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
csp->flags |= CSP_FLAG_FORCED;
}
}
#endif /* def FEATURE_FORCE_LOAD */
err = parse_http_request(req, http);
freez(req);
if (JB_ERR_OK != err)
{
write_socket(csp->cfd, CHEADER, strlen(CHEADER));
/* XXX: Use correct size */
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
log_error(LOG_LEVEL_ERROR,
"Couldn't parse request line received from %s: %s",
csp->ip_addr_str, jb_err_to_string(err));
free_http_request(http);
return JB_ERR_PARSE;
}
/* grab the rest of the client's headers */
init_list(headers);
for (;;)
{
p = get_header(csp->iob);
if (p == NULL)
{
/* There are no additional headers to read. */
break;
}
if (*p == '\0')
{
/*
* We didn't receive a complete header
* line yet, get the rest of it.
*/
if (!data_is_available(csp->cfd, csp->config->socket_timeout))
{
log_error(LOG_LEVEL_ERROR,
"Stopped grabbing the client headers.");
return JB_ERR_PARSE;
}
len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
if (len <= 0)
{
log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
destroy_list(headers);
return JB_ERR_PARSE;
}
if (add_to_iob(csp, buf, len))
{
/*
* If there is no memory left for buffering the
* request, there is nothing we can do but hang up
*/
destroy_list(headers);
return JB_ERR_MEMORY;
}
}
else
{
/*
* We were able to read a complete
* header and can finaly enlist it.
*/
enlist(headers, p);
freez(p);
}
}
if (http->host == NULL)
{
/*
* If we still don't know the request destination,
* the request is invalid or the client uses
* Privoxy without its knowledge.
*/
if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
{
/*
* Our attempts to get the request destination
* elsewhere failed or Privoxy is configured
* to only accept proxy requests.
*
* An error response has already been send
* and we're done here.
*/
return JB_ERR_PARSE;
}
}
/*
* Determine the actions for this URL
*/
#ifdef FEATURE_TOGGLE
if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
{
/* Most compatible set of actions (i.e. none) */
init_current_action(csp->action);
}
else
#endif /* ndef FEATURE_TOGGLE */
{
get_url_actions(csp, http);
}
/*
* Save a copy of the original request for logging
*/
http->ocmd = strdup(http->cmd);
if (http->ocmd == NULL)
{
log_error(LOG_LEVEL_FATAL,
"Out of memory copying HTTP request line");
}
enlist(csp->headers, http->cmd);
/* Append the previously read headers */
list_append_list_unique(csp->headers, headers);
destroy_list(headers);
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : parse_client_request
*
* Description : Parses the client's request and decides what to do
* with it.
*
* Note that since we're not using select() we could get
* blocked here if a client connected, then didn't say
* anything!
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : JB_ERR_OK or JB_ERR_PARSE
*
*********************************************************************/
static jb_err parse_client_request(struct client_state *csp)
{
struct http_request *http = csp->http;
jb_err err;
err = sed(csp, FILTER_CLIENT_HEADERS);
if (JB_ERR_OK != err)
{
/* XXX: Should be handled in sed(). */
assert(err == JB_ERR_PARSE);
log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
}
csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
/* Check request line for rewrites. */
if ((NULL == csp->headers->first->str)
|| (strcmp(http->cmd, csp->headers->first->str) &&
(JB_ERR_OK != change_request_destination(csp))))
{
/*
* A header filter broke the request line - bail out.
*/
write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
/* XXX: Use correct size */
log_error(LOG_LEVEL_CLF,
"%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
log_error(LOG_LEVEL_ERROR,
"Invalid request line after applying header filters.");
free_http_request(http);
return JB_ERR_PARSE;
}
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : chat
*
* Description : Once a connection to the client has been accepted,
* this function is called (via serve()) to handle the
* main business of the communication. When this
* function returns, the caller must close the client
* socket handle.
*
* FIXME: chat is nearly thousand lines long.
* Ridiculous.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : Nothing.
*
*********************************************************************/
static void chat(struct client_state *csp)
{
char buf[BUFFER_SIZE];
char *hdr;
char *p;
fd_set rfds;
int n;
jb_socket maxfd;
int server_body;
int ms_iis5_hack = 0;
unsigned long long byte_count = 0;
int forwarded_connect_retries = 0;
int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
const struct forward_spec *fwd;
struct http_request *http;
long len = 0; /* for buffer sizes (and negative error codes) */
/* Function that does the content filtering for the current request */
filter_function_ptr content_filter = NULL;
/* Skeleton for HTTP response, if we should intercept the request */
struct http_response *rsp;
struct timeval timeout;
memset(buf, 0, sizeof(buf));
http = csp->http;
if (receive_client_request(csp) != JB_ERR_OK)
{
return;
}
if (parse_client_request(csp) != JB_ERR_OK)
{
return;
}
/* decide how to route the HTTP request */
fwd = forward_url(csp, http);
if (NULL == fwd)
{
log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
/* Never get here - LOG_LEVEL_FATAL causes program exit */
return;
}
/*
* build the http request to send to the server
* we have to do one of the following:
*
* create = use the original HTTP request to create a new
* HTTP request that has either the path component
* without the http://domainspec (w/path) or the
* full orininal URL (w/url)
* Note that the path and/or the HTTP version may
* have been altered by now.
*
* connect = Open a socket to the host:port of the server
* and short-circuit server and client socket.
*
* pass = Pass the request unchanged if forwarding a CONNECT
* request to a parent proxy. Note that we'll be sending
* the CFAIL message ourselves if connecting to the parent
* fails, but we won't send a CSUCCEED message if it works,
* since that would result in a double message (ours and the
* parent's). After sending the request to the parent, we simply
* tunnel.
*
* here's the matrix:
* SSL
* 0 1
* +--------+--------+
* | | |
* 0 | create | connect|
* | w/path | |
* Forwarding +--------+--------+
* | | |
* 1 | create | pass |
* | w/url | |
* +--------+--------+
*
*/
if (http->ssl && connect_port_is_forbidden(csp))
{
const char *acceptable_connect_ports =
csp->action->string[ACTION_STRING_LIMIT_CONNECT];
assert(NULL != acceptable_connect_ports);
log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
"limit-connect{%s} doesn't allow CONNECT requests to port %d.",
csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
csp->action->flags |= ACTION_BLOCK;
http->ssl = 0;
}
if (http->ssl == 0)
{
freez(csp->headers->first->str);
build_request_line(csp, fwd, &csp->headers->first->str);
}
/*
* We have a request. Check if one of the crunchers wants it.
*/
if (crunch_response_triggered(csp, crunchers_all))
{
/*
* Yes. The client got the crunch response
* and we are done here after cleaning up.
*/
/* XXX: why list_remove_all()? */
list_remove_all(csp->headers);
return;
}
log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
if (fwd->forward_host)
{
log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
fwd->forward_host, fwd->forward_port, http->hostport);
}
else
{
log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
}
/* here we connect to the server, gateway, or the forwarder */
while ((csp->sfd = forwarded_connect(fwd, http, csp))
&& (errno == EINVAL)
&& (forwarded_connect_retries++ < max_forwarded_connect_retries))
{
log_error(LOG_LEVEL_ERROR,
"failed request #%u to connect to %s. Trying again.",
forwarded_connect_retries, http->hostport);
}
if (csp->sfd == JB_INVALID_SOCKET)
{
if (fwd->type != SOCKS_NONE)
{
/* Socks error. */
rsp = error_response(csp, "forwarding-failed", errno);
}
else if (errno == EINVAL)
{
rsp = error_response(csp, "no-such-domain", errno);
}
else
{
rsp = error_response(csp, "connect-failed", errno);
log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
http->hostport);
}
/* Write the answer to the client */
if (rsp != NULL)
{
send_crunch_response(csp, rsp);
}
return;
}
hdr = list_to_text(csp->headers);
if (hdr == NULL)
{
/* FIXME Should handle error properly */
log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
}
list_remove_all(csp->headers);
if (fwd->forward_host || (http->ssl == 0))
{
/*
* Write the client's (modified) header to the server
* (along with anything else that may be in the buffer)
*/
if (write_socket(csp->sfd, hdr, strlen(hdr))
|| (flush_socket(csp->sfd, csp->iob) < 0))
{
log_error(LOG_LEVEL_CONNECT,
"write header to: %s failed: %E", http->hostport);
rsp = error_response(csp, "connect-failed", errno);
if (rsp)
{
send_crunch_response(csp, rsp);
}
freez(hdr);
return;
}
}
else
{
/*
* We're running an SSL tunnel and we're not forwarding,
* so just send the "connect succeeded" message to the
* client, flush the rest, and get out of the way.
*/
if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
{
freez(hdr);
return;
}
IOB_RESET(csp);
}
log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
/* we're finished with the client's header */
freez(hdr);
maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
/* pass data between the client and server
* until one or the other shuts down the connection.
*/
server_body = 0;
for (;;)
{
#ifdef __OS2__
/*
* FD_ZERO here seems to point to an errant macro which crashes.
* So do this by hand for now...
*/
memset(&rfds,0x00,sizeof(fd_set));
#else
FD_ZERO(&rfds);
#endif
FD_SET(csp->cfd, &rfds);
FD_SET(csp->sfd, &rfds);
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
if ((csp->flags & CSP_FLAG_CHUNKED)
&& !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
&& ((csp->iob->eod - csp->iob->cur) >= 5)
&& !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
{
log_error(LOG_LEVEL_CONNECT,
"Looks like we read the last chunk together with "
"the server headers. We better stop reading.");
byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
csp->expected_content_length = byte_count;
csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
}
if (server_body && server_response_is_complete(csp, byte_count))
{
log_error(LOG_LEVEL_CONNECT,
"Done reading from server. Expected content length: %llu. "
"Actual content length: %llu. Most recently received: %d.",
csp->expected_content_length, byte_count, len);
len = 0;
/*
* XXX: should not jump around,
* chat() is complicated enough already.
*/
goto reading_done;
}
#endif /* FEATURE_CONNECTION_KEEP_ALIVE */
timeout.tv_sec = csp->config->socket_timeout;
timeout.tv_usec = 0;
n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
if (n == 0)
{
log_error(LOG_LEVEL_ERROR,
"Didn't receive data in time: %s", http->url);
if ((byte_count == 0) && (http->ssl == 0))
{
write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
strlen(CONNECTION_TIMEOUT_RESPONSE));
}
mark_server_socket_tainted(csp);
return;
}
else if (n < 0)
{
log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
mark_server_socket_tainted(csp);
return;
}
/*
* This is the body of the browser's request,
* just read and write it.
*/
if (FD_ISSET(csp->cfd, &rfds))
{
len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
if (len <= 0)
{
/* XXX: not sure if this is necessary. */
mark_server_socket_tainted(csp);
break; /* "game over, man" */
}
if (write_socket(csp->sfd, buf, (size_t)len))
{
log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
mark_server_socket_tainted(csp);
return;
}
continue;
}
/*
* The server wants to talk. It could be the header or the body.
* If `hdr' is null, then it's the header otherwise it's the body.
* FIXME: Does `hdr' really mean `host'? No.
*/
if (FD_ISSET(csp->sfd, &rfds))
{
fflush(0);
len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
if (len < 0)
{
log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
if (http->ssl && (fwd->forward_host == NULL))
{
/*
* Just hang up. We already confirmed the client's CONNECT
* request with status code 200 and unencrypted content is
* no longer welcome.
*/
log_error(LOG_LEVEL_ERROR,
"CONNECT already confirmed. Unable to tell the client about the problem.");
return;
}
else if (byte_count)
{
/*
* Just hang up. We already transmitted the original headers
* and parts of the original content and therefore missed the
* chance to send an error message (without risking data corruption).
*
* XXX: we could retry with a fancy range request here.
*/
log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
"Unable to tell the client about the problem.");
mark_server_socket_tainted(csp);
return;
}
rsp = error_response(csp, "connect-failed", errno);
if (rsp)
{
send_crunch_response(csp, rsp);
}
return;
}
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
if (csp->flags & CSP_FLAG_CHUNKED)
{
if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
{
/* XXX: this is a temporary hack */
log_error(LOG_LEVEL_CONNECT,
"Looks like we reached the end of the last chunk. "
"We better stop reading.");
csp->expected_content_length = byte_count + (unsigned long long)len;
csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
}
}
reading_done:
#endif /* FEATURE_CONNECTION_KEEP_ALIVE */
/*
* Add a trailing zero to let be able to use string operations.
* XXX: do we still need this with filter_popups gone?
*/
buf[len] = '\0';
/*
* Normally, this would indicate that we've read
* as much as the server has sent us and we can
* close the client connection. However, Microsoft
* in its wisdom has released IIS/5 with a bug that
* prevents it from sending the trailing \r\n in
* a 302 redirect header (and possibly other headers).
* To work around this if we've haven't parsed
* a full header we'll append a trailing \r\n
* and see if this now generates a valid one.
*
* This hack shouldn't have any impacts. If we've
* already transmitted the header or if this is a
* SSL connection, then we won't bother with this
* hack. So we only work on partially received
* headers. If we append a \r\n and this still
* doesn't generate a valid header, then we won't
* transmit anything to the client.
*/
if (len == 0)
{
if (server_body || http->ssl)
{
/*
* If we have been buffering up the document,
* now is the time to apply content modification
* and send the result to the client.
*/
if (content_filter)
{
p = execute_content_filter(csp, content_filter);
/*
* If the content filter fails, use the original
* buffer and length.
* (see p != NULL ? p : csp->iob->cur below)
*/
if (NULL == p)
{
csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
}
if (JB_ERR_OK != update_server_headers(csp))
{
log_error(LOG_LEVEL_FATAL,
"Failed to update server headers. after filtering.");
}
hdr = list_to_text(csp->headers);
if (hdr == NULL)
{
/* FIXME Should handle error properly */
log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
}
if (write_socket(csp->cfd, hdr, strlen(hdr))
|| write_socket(csp->cfd,
((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
{
log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
freez(hdr);
freez(p);
mark_server_socket_tainted(csp);
return;
}
freez(hdr);
freez(p);
}
break; /* "game over, man" */
}
/*
* This is NOT the body, so
* Let's pretend the server just sent us a blank line.
*/
snprintf(buf, sizeof(buf), "\r\n");
len = (int)strlen(buf);
/*
* Now, let the normal header parsing algorithm below do its
* job. If it fails, we'll exit instead of continuing.
*/
ms_iis5_hack = 1;
}
/*
* If this is an SSL connection or we're in the body
* of the server document, just write it to the client,
* unless we need to buffer the body for later content-filtering
*/
if (server_body || http->ssl)
{
if (content_filter)
{
/*
* If there is no memory left for buffering the content, or the buffer limit
* has been reached, switch to non-filtering mode, i.e. make & write the
* header, flush the iob and buf, and get out of the way.
*/
if (add_to_iob(csp, buf, len))
{
size_t hdrlen;
long flushed;
log_error(LOG_LEVEL_INFO,
"Flushing header and buffers. Stepping back from filtering.");
hdr = list_to_text(csp->headers);
if (hdr == NULL)
{
/*
* Memory is too tight to even generate the header.
* Send our static "Out-of-memory" page.
*/
log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
rsp = cgi_error_memory();
send_crunch_response(csp, rsp);
mark_server_socket_tainted(csp);
return;
}
hdrlen = strlen(hdr);
if (write_socket(csp->cfd, hdr, hdrlen)
|| ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
|| (write_socket(csp->cfd, buf, (size_t)len)))
{
log_error(LOG_LEVEL_CONNECT,
"Flush header and buffers to client failed: %E");
freez(hdr);
mark_server_socket_tainted(csp);
return;
}
/*
* Reset the byte_count to the amount of bytes
* we just flushed. len will be added a few lines below,
* hdrlen doesn't matter for LOG_LEVEL_CLF.
*/
byte_count = (unsigned long long)flushed;
freez(hdr);
content_filter = NULL;
server_body = 1;
}
}
else
{
if (write_socket(csp->cfd, buf, (size_t)len))
{
log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
mark_server_socket_tainted(csp);
return;
}
}
byte_count += (unsigned long long)len;
continue;
}
else
{
const char *header_start;
/*
* We're still looking for the end of the server's header.
* Buffer up the data we just read. If that fails, there's
* little we can do but send our static out-of-memory page.
*/
if (add_to_iob(csp, buf, len))
{
log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
rsp = cgi_error_memory();
send_crunch_response(csp, rsp);
mark_server_socket_tainted(csp);
return;
}
header_start = csp->iob->cur;
/* Convert iob into something sed() can digest */
if (JB_ERR_PARSE == get_server_headers(csp))
{
if (ms_iis5_hack)
{
/*
* Well, we tried our MS IIS/5 hack and it didn't work.
* The header is incomplete and there isn't anything
* we can do about it.
*/
log_error(LOG_LEVEL_INFO,
"MS IIS5 hack didn't produce valid headers.");
break;
}
else
{
/*
* Since we have to wait for more from the server before
* we can parse the headers we just continue here.
*/
long header_offset = csp->iob->cur - header_start;
assert(csp->iob->cur >= header_start);
byte_count += (unsigned long long)(len - header_offset);
log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
"byte_count: %llu. header_offset: %d. len: %d.",
byte_count, header_offset, len);
continue;
}
}
/* Did we actually get anything? */
if (NULL == csp->headers->first)
{
log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
free_http_request(http);
mark_server_socket_tainted(csp);
return;
}
assert(csp->headers->first->str);
assert(!http->ssl);
if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
strncmpic(csp->headers->first->str, "ICY", 3))
{
/*
* It doesn't look like a HTTP (or Shoutcast) response:
* tell the client and log the problem.
*/
if (strlen(csp->headers->first->str) > 30)
{
csp->headers->first->str[30] = '\0';
}
log_error(LOG_LEVEL_ERROR,
"Invalid server or forwarder response. Starts with: %s",
csp->headers->first->str);
log_error(LOG_LEVEL_CLF,
"%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
strlen(INVALID_SERVER_HEADERS_RESPONSE));
free_http_request(http);
mark_server_socket_tainted(csp);
return;
}
/*
* We have now received the entire server header,
* filter it and send the result to the client
*/
if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
{
log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
}
hdr = list_to_text(csp->headers);
if (hdr == NULL)
{
/* FIXME Should handle error properly */
log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
}
if (crunch_response_triggered(csp, crunchers_light))
{
/*
* One of the tags created by a server-header
* tagger triggered a crunch. We already
* delivered the crunch response to the client
* and are done here after cleaning up.
*/
freez(hdr);
mark_server_socket_tainted(csp);
return;
}
/* Buffer and pcrs filter this if appropriate. */
if (!http->ssl) /* We talk plaintext */
{
content_filter = get_filter_function(csp);
}
/*
* Only write if we're not buffering for content modification
*/
if (!content_filter)
{
/*
* Write the server's (modified) header to
* the client (along with anything else that
* may be in the buffer)
*/
if (write_socket(csp->cfd, hdr, strlen(hdr))
|| ((len = flush_socket(csp->cfd, csp->iob)) < 0))
{
log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
/*
* The write failed, so don't bother mentioning it
* to the client... it probably can't hear us anyway.
*/
freez(hdr);
mark_server_socket_tainted(csp);
return;
}
byte_count += (unsigned long long)len;
}
else
{
/*
* XXX: the header lenght should probably
* be calculated by get_server_headers().
*/
long header_length = csp->iob->cur - header_start;
assert(csp->iob->cur > header_start);
byte_count += (unsigned long long)(len - header_length);
}
/* we're finished with the server's header */
freez(hdr);
server_body = 1;
/*
* If this was a MS IIS/5 hack then it means the server
* has already closed the connection. Nothing more to read.
* Time to bail.
*/
if (ms_iis5_hack)
{
log_error(LOG_LEVEL_INFO,
"Closed server connection detected with MS IIS5 hack enabled.");
break;
}
}
continue;
}
mark_server_socket_tainted(csp);
return; /* huh? we should never get here */
}
if (csp->content_length == 0)
{
/*
* If Privoxy didn't recalculate the Content-Lenght,
* byte_count is still correct.
*/
csp->content_length = byte_count;
}
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
&& (csp->expected_content_length != byte_count))
{
log_error(LOG_LEVEL_CONNECT,
"Received %llu bytes while expecting %llu.",
byte_count, csp->expected_content_length);
mark_server_socket_tainted(csp);
}
#endif
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
csp->ip_addr_str, http->ocmd, csp->content_length);
}
/*********************************************************************
*
* Function : serve
*
* Description : This is little more than chat. We only "serve" to
* to close any socket that chat may have opened.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : N/A
*
*********************************************************************/
#ifdef AMIGA
void serve(struct client_state *csp)
#else /* ifndef AMIGA */
static void serve(struct client_state *csp)
#endif /* def AMIGA */
{
chat(csp);
close_socket(csp->cfd);
if (csp->sfd != JB_INVALID_SOCKET)
{
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
static int monitor_thread_running = 0;
if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
&& (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
{
remember_connection(csp->sfd, csp->http, forward_url(csp, csp->http));
privoxy_mutex_lock(&connection_reuse_mutex);
if (!monitor_thread_running)
{
monitor_thread_running = 1;
privoxy_mutex_unlock(&connection_reuse_mutex);
wait_for_alive_connections();
privoxy_mutex_lock(&connection_reuse_mutex);
monitor_thread_running = 0;
}
privoxy_mutex_unlock(&connection_reuse_mutex);
}
else
{
forget_connection(csp->sfd);
close_socket(csp->sfd);
}
#else
close_socket(csp->sfd);
#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
}
csp->flags &= ~CSP_FLAG_ACTIVE;
}
#ifdef __BEOS__
/*********************************************************************
*
* Function : server_thread
*
* Description : We only exist to call `serve' in a threaded environment.
*
* Parameters :
* 1 : data = Current client state (buffers, headers, etc...)
*
* Returns : Always 0.
*
*********************************************************************/
static int32 server_thread(void *data)
{
serve((struct client_state *) data);
return 0;
}
#endif
#if !defined(_WIN32) || defined(_WIN_CONSOLE)
/*********************************************************************
*
* Function : usage
*
* Description : Print usage info & exit.
*
* Parameters : Pointer to argv[0] for identifying ourselves
*
* Returns : No. ,-)
*
*********************************************************************/
static void usage(const char *myname)
{
printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
"Usage: %s "
#if defined(unix)
"[--chroot] "
#endif /* defined(unix) */
"[--help] "
#if defined(unix)
"[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
#endif /* defined(unix) */
"[--version] [configfile]\n"
"Aborting\n", myname);
exit(2);
}
#endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
#ifdef MUTEX_LOCKS_AVAILABLE
/*********************************************************************
*
* Function : privoxy_mutex_lock
*
* Description : Locks a mutex.
*
* Parameters :
* 1 : mutex = The mutex to lock.
*
* Returns : Void. May exit in case of errors.
*
*********************************************************************/
void privoxy_mutex_lock(privoxy_mutex_t *mutex)
{
#ifdef FEATURE_PTHREAD
int err = pthread_mutex_lock(mutex);
if (err)
{
if (mutex != &log_mutex)
{
log_error(LOG_LEVEL_FATAL,
"Mutex locking failed: %s.\n", strerror(err));
}
exit(1);
}
#else
EnterCriticalSection(mutex);
#endif /* def FEATURE_PTHREAD */
}
/*********************************************************************
*
* Function : privoxy_mutex_unlock
*
* Description : Unlocks a mutex.
*
* Parameters :
* 1 : mutex = The mutex to unlock.
*
* Returns : Void. May exit in case of errors.
*
*********************************************************************/
void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
{
#ifdef FEATURE_PTHREAD
int err = pthread_mutex_unlock(mutex);
if (err)
{
if (mutex != &log_mutex)
{
log_error(LOG_LEVEL_FATAL,
"Mutex unlocking failed: %s.\n", strerror(err));
}
exit(1);
}
#else
LeaveCriticalSection(mutex);
#endif /* def FEATURE_PTHREAD */
}
/*********************************************************************
*
* Function : privoxy_mutex_init
*
* Description : Prepares a mutex.
*
* Parameters :
* 1 : mutex = The mutex to initialize.
*
* Returns : Void. May exit in case of errors.
*
*********************************************************************/
static void privoxy_mutex_init(privoxy_mutex_t *mutex)
{
#ifdef FEATURE_PTHREAD
int err = pthread_mutex_init(mutex, 0);
if (err)
{
printf("Fatal error. Mutex initialization failed: %s.\n",
strerror(err));
exit(1);
}
#else
InitializeCriticalSection(mutex);
#endif /* def FEATURE_PTHREAD */
}
#endif /* def MUTEX_LOCKS_AVAILABLE */
/*********************************************************************
*
* Function : initialize_mutexes
*
* Description : Prepares mutexes if mutex support is available.
*
* Parameters : None
*
* Returns : Void, exits in case of errors.
*
*********************************************************************/
static void initialize_mutexes(void)
{
#ifdef MUTEX_LOCKS_AVAILABLE
/*
* Prepare global mutex semaphores
*/
privoxy_mutex_init(&log_mutex);
privoxy_mutex_init(&log_init_mutex);
privoxy_mutex_init(&connection_reuse_mutex);
/*
* XXX: The assumptions below are a bit naive
* and can cause locks that aren't necessary.
*
* For example older FreeBSD versions (< 6.x?)
* have no gethostbyname_r, but gethostbyname is
* thread safe.
*/
#if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
privoxy_mutex_init(&resolver_mutex);
#endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
/*
* XXX: should we use a single mutex for
* localtime() and gmtime() as well?
*/
#ifndef HAVE_GMTIME_R
privoxy_mutex_init(&gmtime_mutex);
#endif /* ndef HAVE_GMTIME_R */
#ifndef HAVE_LOCALTIME_R
privoxy_mutex_init(&localtime_mutex);
#endif /* ndef HAVE_GMTIME_R */
#ifndef HAVE_RANDOM
privoxy_mutex_init(&rand_mutex);
#endif /* ndef HAVE_RANDOM */
#endif /* def MUTEX_LOCKS_AVAILABLE */
}
/*********************************************************************
*
* Function : main
*
* Description : Load the config file and start the listen loop.
* This function is a lot more *sane* with the `load_config'
* and `listen_loop' functions; although it stills does
* a *little* too much for my taste.
*
* Parameters :
* 1 : argc = Number of parameters (including $0).
* 2 : argv = Array of (char *)'s to the parameters.
*
* Returns : 1 if : can't open config file, unrecognized directive,
* stats requested in multi-thread mode, can't open the
* log file, can't open the jar file, listen port is invalid,
* any load fails, and can't bind port.
*
* Else main never returns, the process must be signaled
* to terminate execution. Or, on Windows, use the
* "File", "Exit" menu option.
*
*********************************************************************/
#ifdef __MINGW32__
int real_main(int argc, const char *argv[])
#else
int main(int argc, const char *argv[])
#endif
{
int argc_pos = 0;
unsigned int random_seed;
#ifdef unix
struct passwd *pw = NULL;
struct group *grp = NULL;
char *p;
int do_chroot = 0;
char *pre_chroot_nslookup_to_load_resolver = NULL;
#endif
Argc = argc;
Argv = argv;
configfile =
#if !defined(_WIN32)
"config"
#else
"config.txt"
#endif
;
/* Prepare mutexes if supported and necessary. */
initialize_mutexes();
/* Enable logging until further notice. */
init_log_module();
/*
* Parse the command line arguments
*
* XXX: simply printing usage information in case of
* invalid arguments isn't particularly user friendly.
*/
while (++argc_pos < argc)
{
#ifdef _WIN32
/* Check to see if the service must be installed or uninstalled */
if (strncmp(argv[argc_pos], "--install", 9) == 0)
{
const char *pName = argv[argc_pos] + 9;
if (*pName == ':')
pName++;
exit( (install_service(pName)) ? 0 : 1 );
}
else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
{
const char *pName = argv[argc_pos] + 11;
if (*pName == ':')
pName++;
exit((uninstall_service(pName)) ? 0 : 1);
}
else if (strcmp(argv[argc_pos], "--service" ) == 0)
{
bRunAsService = TRUE;
w32_set_service_cwd();
atexit(w32_service_exit_notify);
}
else
#endif /* defined(_WIN32) */
#if !defined(_WIN32) || defined(_WIN_CONSOLE)
if (strcmp(argv[argc_pos], "--help") == 0)
{
usage(argv[0]);
}
else if(strcmp(argv[argc_pos], "--version") == 0)
{
printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
exit(0);
}
#if defined(unix)
else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
{
set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
no_daemon = 1;
}
else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
{
if (++argc_pos == argc) usage(argv[0]);
pidfile = strdup(argv[argc_pos]);
}
else if (strcmp(argv[argc_pos], "--user" ) == 0)
{
if (++argc_pos == argc) usage(argv[argc_pos]);
if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
{
*p++ = '\0';
if (NULL == (grp = getgrnam(p)))
{
log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
}
}
if (NULL == (pw = getpwnam(argv[argc_pos])))
{
log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
}
if (p != NULL) *--p = '\0';
}
else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
{
if (++argc_pos == argc) usage(argv[0]);
pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
}
else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
{
do_chroot = 1;
}
#endif /* defined(unix) */
else if (argc_pos + 1 != argc)
{
/*
* This is neither the last command line
* option, nor was it recognized before,
* therefore it must be invalid.
*/
usage(argv[0]);
}
else
#endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
{
configfile = argv[argc_pos];
}
} /* -END- while (more arguments) */
show_version(Argv[0]);
#if defined(unix)
if ( *configfile != '/' )
{
char cwd[BUFFER_SIZE];
char *abs_file;
size_t abs_file_size;
/* make config-filename absolute here */
if (NULL == getcwd(cwd, sizeof(cwd)))
{
perror("failed to get current working directory");
exit( 1 );
}
/* XXX: why + 5? */
abs_file_size = strlen(cwd) + strlen(configfile) + 5;
basedir = strdup(cwd);
if (NULL == basedir ||
NULL == (abs_file = malloc(abs_file_size)))
{
perror("malloc failed");
exit( 1 );
}
strlcpy(abs_file, basedir, abs_file_size);
strlcat(abs_file, "/", abs_file_size );
strlcat(abs_file, configfile, abs_file_size);
configfile = abs_file;
}
#endif /* defined unix */
files->next = NULL;
clients->next = NULL;
/* XXX: factor out initialising after the next stable release. */
#ifdef AMIGA
InitAmiga();
#elif defined(_WIN32)
InitWin32();
#endif
random_seed = (unsigned int)time(NULL);
#ifdef HAVE_RANDOM
srandom(random_seed);
#else
srand(random_seed);
#endif /* ifdef HAVE_RANDOM */
/*
* Unix signal handling
*
* Catch the abort, interrupt and terminate signals for a graceful exit
* Catch the hangup signal so the errlog can be reopened.
* Ignore the broken pipe signals (FIXME: Why?)
*/
#if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
{
int idx;
const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
const int ignored_signals[] = { SIGPIPE, 0 };
for (idx = 0; catched_signals[idx] != 0; idx++)
{
#ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
#else
if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
#endif /* ifdef sun */
{
log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
}
}
for (idx = 0; ignored_signals[idx] != 0; idx++)
{
if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
{
log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
}
}
}
#else /* ifdef _WIN32 */
# ifdef _WIN_CONSOLE
/*
* We *are* in a windows console app.
* Print a verbose messages about FAQ's and such
*/
printf("%s", win32_blurb);
# endif /* def _WIN_CONSOLE */
#endif /* def _WIN32 */
/* Initialize the CGI subsystem */
cgi_init_error_messages();
/*
* If runnig on unix and without the --nodaemon
* option, become a daemon. I.e. fork, detach
* from tty and get process group leadership
*/
#if defined(unix)
{
pid_t pid = 0;
#if 0
int fd;
#endif
if (!no_daemon)
{
pid = fork();
if ( pid < 0 ) /* error */
{
perror("fork");
exit( 3 );
}
else if ( pid != 0 ) /* parent */
{
int status;
pid_t wpid;
/*
* must check for errors
* child died due to missing files aso
*/
sleep( 1 );
wpid = waitpid( pid, &status, WNOHANG );
if ( wpid != 0 )
{
exit( 1 );
}
exit( 0 );
}
/* child */
#if 1
/* Should be more portable, but not as well tested */
setsid();
#else /* !1 */
#ifdef __FreeBSD__
setpgrp(0,0);
#else /* ndef __FreeBSD__ */
setpgrp();
#endif /* ndef __FreeBSD__ */
fd = open("/dev/tty", O_RDONLY);
if ( fd )
{
/* no error check here */
ioctl( fd, TIOCNOTTY,0 );
close ( fd );
}
#endif /* 1 */
/*
* stderr (fd 2) will be closed later on,
* when the config file has been parsed.
*/
close( 0 );
close( 1 );
chdir("/");
} /* -END- if (!no_daemon) */
/*
* As soon as we have written the PID file, we can switch
* to the user and group ID indicated by the --user option
*/
write_pid_file();
if (NULL != pw)
{
if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
{
log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
}
if (NULL != grp)
{
if (setgroups(1, &grp->gr_gid))
{
log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
}
}
else if (initgroups(pw->pw_name, pw->pw_gid))
{
log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
}
if (do_chroot)
{
if (!pw->pw_dir)
{
log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
}
/* Read the time zone file from /etc before doing chroot. */
tzset();
if (NULL != pre_chroot_nslookup_to_load_resolver
&& '\0' != pre_chroot_nslookup_to_load_resolver[0])
{
/* Initialize resolver library. */
(void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
}
if (chroot(pw->pw_dir) < 0)
{
log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
}
if (chdir ("/"))
{
log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
}
}
if (setuid(pw->pw_uid))
{
log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
}
if (do_chroot)
{
char putenv_dummy[64];
strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
if (putenv(putenv_dummy) != 0)
{
log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
}
snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
if (putenv(putenv_dummy) != 0)
{
log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
}
}
}
else if (do_chroot)
{
log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
}
}
#endif /* defined unix */
#ifdef _WIN32
/* This will be FALSE unless the command line specified --service
*/
if (bRunAsService)
{
/* Yup, so now we must attempt to establish a connection
* with the service dispatcher. This will only work if this
* process was launched by the service control manager to
* actually run as a service. If this isn't the case, i've
* known it take around 30 seconds or so for the call to return.
*/
/* The StartServiceCtrlDispatcher won't return until the service is stopping */
if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
{
/* Service has run, and at this point is now being stopped, so just return */
return 0;
}
#ifdef _WIN_CONSOLE
printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
#endif
/* An error occurred. Usually it's because --service was wrongly specified
* and we were unable to connect to the Service Control Dispatcher because
* it wasn't expecting us and is therefore not listening.
*
* For now, just continue below to call the listen_loop function.
*/
}
#endif /* def _WIN32 */
listen_loop();
/* NOTREACHED */
return(-1);
}
/*********************************************************************
*
* Function : bind_port_helper
*
* Description : Bind the listen port. Handles logging, and aborts
* on failure.
*
* Parameters :
* 1 : config = Privoxy configuration. Specifies port
* to bind to.
*
* Returns : Port that was opened.
*
*********************************************************************/
static jb_socket bind_port_helper(struct configuration_spec * config)
{
int result;
jb_socket bfd;
if (config->haddr == NULL)
{
log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
config->hport);
}
else
{
log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
config->hport, config->haddr);
}
result = bind_port(config->haddr, config->hport, &bfd);
if (result < 0)
{
switch(result)
{
case -3 :
log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
"There may be another Privoxy or some other "
"proxy running on port %d",
(NULL != config->haddr) ? config->haddr : "INADDR_ANY",
config->hport, config->hport);
case -2 :
log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
"The hostname is not resolvable",
(NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
default :
log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
(NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
}
/* shouldn't get here */
return JB_INVALID_SOCKET;
}
config->need_bind = 0;
return bfd;
}
#ifdef _WIN32
/* Without this simple workaround we get this compiler warning from _beginthread
* warning C4028: formal parameter 1 different from declaration
*/
void w32_service_listen_loop(void *p)
{
listen_loop();
}
#endif /* def _WIN32 */
/*********************************************************************
*
* Function : listen_loop
*
* Description : bind the listen port and enter a "FOREVER" listening loop.
*
* Parameters : N/A
*
* Returns : Never.
*
*********************************************************************/
static void listen_loop(void)
{
struct client_state *csp = NULL;
jb_socket bfd;
struct configuration_spec * config;
config = load_config();
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
/*
* XXX: Should be relocated once it no
* longer needs to emit log messages.
*/
initialize_reusable_connections();
#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
bfd = bind_port_helper(config);
#ifdef FEATURE_GRACEFUL_TERMINATION
while (!g_terminate)
#else
for (;;)
#endif
{
#if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
while (waitpid(-1, NULL, WNOHANG) > 0)
{
/* zombie children */
}
#endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
/*
* Free data that was used by died threads
*/
sweep();
#if defined(unix)
/*
* Re-open the errlog after HUP signal
*/
if (received_hup_signal)
{
if (NULL != config->logfile)
{
init_error_log(Argv[0], config->logfile);
}
received_hup_signal = 0;
}
#endif
if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
{
log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
continue;
}
csp->flags |= CSP_FLAG_ACTIVE;
csp->sfd = JB_INVALID_SOCKET;
csp->config = config = load_config();
if ( config->need_bind )
{
/*
* Since we were listening to the "old port", we will not see
* a "listen" param change until the next IJB request. So, at
* least 1 more request must be made for us to find the new
* setting. I am simply closing the old socket and binding the
* new one.
*
* Which-ever is correct, we will serve 1 more page via the
* old settings. This should probably be a "show-proxy-args"
* request. This should not be a so common of an operation
* that this will hurt people's feelings.
*/
close_socket(bfd);
bfd = bind_port_helper(config);
}
log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
if (!accept_connection(csp, bfd))
{
log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
#ifdef AMIGA
if(!childs)
{
exit(1);
}
#endif
freez(csp);
continue;
}
else
{
log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
}
#ifdef FEATURE_TOGGLE
if (global_toggle_state)
#endif /* def FEATURE_TOGGLE */
{
csp->flags |= CSP_FLAG_TOGGLED_ON;
}
if (run_loader(csp))
{
log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
/* Never get here - LOG_LEVEL_FATAL causes program exit */
}
#ifdef FEATURE_ACL
if (block_acl(NULL,csp))
{
log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
close_socket(csp->cfd);
freez(csp);
continue;
}
#endif /* def FEATURE_ACL */
/* add it to the list of clients */
csp->next = clients->next;
clients->next = csp;
if (config->multi_threaded)
{
int child_id;
/* this is a switch () statment in the C preprocessor - ugh */
#undef SELECTED_ONE_OPTION
/* Use Pthreads in preference to native code */
#if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
#define SELECTED_ONE_OPTION
{
pthread_t the_thread;
pthread_attr_t attrs;
pthread_attr_init(&attrs);
pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
errno = pthread_create(&the_thread, &attrs,
(void * (*)(void *))serve, csp);
child_id = errno ? -1 : 0;
pthread_attr_destroy(&attrs);
}
#endif
#if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
#define SELECTED_ONE_OPTION
child_id = _beginthread(
(void (*)(void *))serve,
64 * 1024,
csp);
#endif
#if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
#define SELECTED_ONE_OPTION
child_id = _beginthread(
(void(* _Optlink)(void*))serve,
NULL,
64 * 1024,
csp);
#endif
#if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
#define SELECTED_ONE_OPTION
{
thread_id tid = spawn_thread
(server_thread, "server", B_NORMAL_PRIORITY, csp);
if ((tid >= 0) && (resume_thread(tid) == B_OK))
{
child_id = (int) tid;
}
else
{
child_id = -1;
}
}
#endif
#if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
#define SELECTED_ONE_OPTION
csp->cfd = ReleaseSocket(csp->cfd, -1);
#ifdef __amigaos4__
child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
NP_Output, Output(),
NP_CloseOutput, FALSE,
NP_Name, (ULONG)"privoxy child",
NP_Child, TRUE,
TAG_DONE);
#else
child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
NP_Output, Output(),
NP_CloseOutput, FALSE,
NP_Name, (ULONG)"privoxy child",
NP_StackSize, 200*1024,
TAG_DONE);
#endif
if(0 != child_id)
{
childs++;
((struct Task *)child_id)->tc_UserData = csp;
Signal((struct Task *)child_id, SIGF_SINGLE);
Wait(SIGF_SINGLE);
}
#endif
#if !defined(SELECTED_ONE_OPTION)
child_id = fork();
/* This block is only needed when using fork().
* When using threads, the server thread was
* created and run by the call to _beginthread().
*/
if (child_id == 0) /* child */
{
int rc = 0;
#ifdef FEATURE_TOGGLE
int inherited_toggle_state = global_toggle_state;
#endif /* def FEATURE_TOGGLE */
serve(csp);
/*
* If we've been toggled or we've blocked the request, tell Mom
*/
#ifdef FEATURE_TOGGLE
if (inherited_toggle_state != global_toggle_state)
{
rc |= RC_FLAG_TOGGLED;
}
#endif /* def FEATURE_TOGGLE */
#ifdef FEATURE_STATISTICS
if (csp->flags & CSP_FLAG_REJECTED)
{
rc |= RC_FLAG_BLOCKED;
}
#endif /* ndef FEATURE_STATISTICS */
_exit(rc);
}
else if (child_id > 0) /* parent */
{
/* in a fork()'d environment, the parent's
* copy of the client socket and the CSP
* are not used.
*/
int child_status;
#if !defined(_WIN32) && !defined(__CYGWIN__)
wait( &child_status );
/*
* Evaluate child's return code: If the child has
* - been toggled, toggle ourselves
* - blocked its request, bump up the stats counter
*/
#ifdef FEATURE_TOGGLE
if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
{
global_toggle_state = !global_toggle_state;
}
#endif /* def FEATURE_TOGGLE */
#ifdef FEATURE_STATISTICS
urls_read++;
if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
{
urls_rejected++;
}
#endif /* def FEATURE_STATISTICS */
#endif /* !defined(_WIN32) && defined(__CYGWIN__) */
close_socket(csp->cfd);
csp->flags &= ~CSP_FLAG_ACTIVE;
}
#endif
#undef SELECTED_ONE_OPTION
/* end of cpp switch () */
if (child_id < 0) /* failed */
{
char buf[BUFFER_SIZE];
log_error(LOG_LEVEL_ERROR, "can't fork: %E");
snprintf(buf , sizeof(buf), "Privoxy: can't fork: errno = %d", errno);
write_socket(csp->cfd, buf, strlen(buf));
close_socket(csp->cfd);
csp->flags &= ~CSP_FLAG_ACTIVE;
sleep(5);
continue;
}
}
else
{
serve(csp);
}
}
/* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
/* Clean up. Aim: free all memory (no leaks) */
#ifdef FEATURE_GRACEFUL_TERMINATION
log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
unload_current_config_file();
unload_current_actions_file();
unload_current_re_filterfile();
#ifdef FEATURE_TRUST
unload_current_trust_file();
#endif
if (config->multi_threaded)
{
int i = 60;
do
{
sleep(1);
sweep();
} while ((clients->next != NULL) && (--i > 0));
if (i <= 0)
{
log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
}
}
sweep();
sweep();
#if defined(unix)
freez(basedir);
#endif
freez(configfile);
#if defined(_WIN32) && !defined(_WIN_CONSOLE)
/* Cleanup - remove taskbar icon etc. */
TermLogWindow();
#endif
exit(0);
#endif /* FEATURE_GRACEFUL_TERMINATION */
}
/*
Local Variables:
tab-width: 3
end:
*/
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